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[lttng-modules.git] / src / lttng-events.c
1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
2 *
3 * lttng-events.c
4 *
5 * Holds LTTng per-session event registry.
6 *
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 */
9
10 /*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14 #include "wrapper/page_alloc.h"
15
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
30
31 #include <wrapper/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
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/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.h>
50 #include <wrapper/time.h>
51
52 #define METADATA_CACHE_DEFAULT_SIZE 4096
53
54 static LIST_HEAD(sessions);
55 static LIST_HEAD(event_notifier_groups);
56 static LIST_HEAD(lttng_transport_list);
57 static LIST_HEAD(lttng_counter_transport_list);
58 /*
59 * Protect the sessions and metadata caches.
60 */
61 static DEFINE_MUTEX(sessions_mutex);
62 static struct kmem_cache *event_recorder_cache;
63 static struct kmem_cache *event_recorder_private_cache;
64 static struct kmem_cache *event_notifier_cache;
65 static struct kmem_cache *event_notifier_private_cache;
66
67 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
68 static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
69 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
70 static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
71
72 static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
74 static int _lttng_event_unregister(struct lttng_kernel_event_common *event);
75 static
76 int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
77 struct lttng_kernel_channel_buffer *chan,
78 struct lttng_kernel_event_recorder *event);
79 static
80 int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
81 static
82 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
83 static
84 int _lttng_type_statedump(struct lttng_kernel_session *session,
85 const struct lttng_kernel_type_common *type,
86 enum lttng_kernel_string_encoding parent_encoding,
87 size_t nesting);
88 static
89 int _lttng_field_statedump(struct lttng_kernel_session *session,
90 const struct lttng_kernel_event_field *field,
91 size_t nesting, const char **prev_field_name_p);
92
93 void synchronize_trace(void)
94 {
95 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
96 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
97 synchronize_rcu();
98 #else
99 synchronize_sched();
100 #endif
101
102 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
103 #ifdef CONFIG_PREEMPT_RT_FULL
104 synchronize_rcu();
105 #endif
106 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
107 #ifdef CONFIG_PREEMPT_RT
108 synchronize_rcu();
109 #endif
110 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
111 }
112
113 void lttng_lock_sessions(void)
114 {
115 mutex_lock(&sessions_mutex);
116 }
117
118 void lttng_unlock_sessions(void)
119 {
120 mutex_unlock(&sessions_mutex);
121 }
122
123 static struct lttng_transport *lttng_transport_find(const char *name)
124 {
125 struct lttng_transport *transport;
126
127 list_for_each_entry(transport, &lttng_transport_list, node) {
128 if (!strcmp(transport->name, name))
129 return transport;
130 }
131 return NULL;
132 }
133
134 /*
135 * Called with sessions lock held.
136 */
137 int lttng_session_active(void)
138 {
139 struct lttng_kernel_session_private *iter;
140
141 list_for_each_entry(iter, &sessions, list) {
142 if (iter->pub->active)
143 return 1;
144 }
145 return 0;
146 }
147
148 struct lttng_kernel_session *lttng_session_create(void)
149 {
150 struct lttng_kernel_session *session;
151 struct lttng_kernel_session_private *session_priv;
152 struct lttng_metadata_cache *metadata_cache;
153 int i;
154
155 mutex_lock(&sessions_mutex);
156 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
157 if (!session)
158 goto err;
159 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
160 if (!session_priv)
161 goto err_free_session;
162 session->priv = session_priv;
163 session_priv->pub = session;
164
165 INIT_LIST_HEAD(&session_priv->chan);
166 INIT_LIST_HEAD(&session_priv->events);
167 lttng_guid_gen(&session_priv->uuid);
168
169 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
170 GFP_KERNEL);
171 if (!metadata_cache)
172 goto err_free_session_private;
173 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
174 if (!metadata_cache->data)
175 goto err_free_cache;
176 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
177 kref_init(&metadata_cache->refcount);
178 mutex_init(&metadata_cache->lock);
179 session_priv->metadata_cache = metadata_cache;
180 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
181 memcpy(&metadata_cache->uuid, &session_priv->uuid,
182 sizeof(metadata_cache->uuid));
183 INIT_LIST_HEAD(&session_priv->enablers_head);
184 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
185 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
186 list_add(&session_priv->list, &sessions);
187
188 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
189 goto tracker_alloc_error;
190 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
191 goto tracker_alloc_error;
192 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
193 goto tracker_alloc_error;
194 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
195 goto tracker_alloc_error;
196 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
197 goto tracker_alloc_error;
198 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
199 goto tracker_alloc_error;
200
201 mutex_unlock(&sessions_mutex);
202
203 return session;
204
205 tracker_alloc_error:
206 lttng_id_tracker_fini(&session->pid_tracker);
207 lttng_id_tracker_fini(&session->vpid_tracker);
208 lttng_id_tracker_fini(&session->uid_tracker);
209 lttng_id_tracker_fini(&session->vuid_tracker);
210 lttng_id_tracker_fini(&session->gid_tracker);
211 lttng_id_tracker_fini(&session->vgid_tracker);
212 err_free_cache:
213 kfree(metadata_cache);
214 err_free_session_private:
215 lttng_kvfree(session_priv);
216 err_free_session:
217 lttng_kvfree(session);
218 err:
219 mutex_unlock(&sessions_mutex);
220 return NULL;
221 }
222
223 static
224 struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
225 {
226 struct lttng_counter_transport *transport;
227
228 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
229 if (!strcmp(transport->name, name))
230 return transport;
231 }
232 return NULL;
233 }
234
235 struct lttng_counter *lttng_kernel_counter_create(
236 const char *counter_transport_name,
237 size_t number_dimensions, const size_t *dimensions_sizes)
238 {
239 struct lttng_counter *counter = NULL;
240 struct lttng_counter_transport *counter_transport = NULL;
241
242 counter_transport = lttng_counter_transport_find(counter_transport_name);
243 if (!counter_transport) {
244 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
245 counter_transport_name);
246 goto notransport;
247 }
248 if (!try_module_get(counter_transport->owner)) {
249 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
250 goto notransport;
251 }
252
253 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
254 if (!counter)
255 goto nomem;
256
257 /* Create event notifier error counter. */
258 counter->ops = &counter_transport->ops;
259 counter->transport = counter_transport;
260
261 counter->counter = counter->ops->counter_create(
262 number_dimensions, dimensions_sizes, 0);
263 if (!counter->counter) {
264 goto create_error;
265 }
266
267 return counter;
268
269 create_error:
270 lttng_kvfree(counter);
271 nomem:
272 if (counter_transport)
273 module_put(counter_transport->owner);
274 notransport:
275 return NULL;
276 }
277
278 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
279 {
280 struct lttng_transport *transport = NULL;
281 struct lttng_event_notifier_group *event_notifier_group;
282 const char *transport_name = "relay-event-notifier";
283 size_t subbuf_size = 4096; //TODO
284 size_t num_subbuf = 16; //TODO
285 unsigned int switch_timer_interval = 0;
286 unsigned int read_timer_interval = 0;
287 int i;
288
289 mutex_lock(&sessions_mutex);
290
291 transport = lttng_transport_find(transport_name);
292 if (!transport) {
293 printk(KERN_WARNING "LTTng: transport %s not found\n",
294 transport_name);
295 goto notransport;
296 }
297 if (!try_module_get(transport->owner)) {
298 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
299 transport_name);
300 goto notransport;
301 }
302
303 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
304 GFP_KERNEL);
305 if (!event_notifier_group)
306 goto nomem;
307
308 /*
309 * Initialize the ring buffer used to store event notifier
310 * notifications.
311 */
312 event_notifier_group->ops = &transport->ops;
313 event_notifier_group->chan = transport->ops.priv->channel_create(
314 transport_name, event_notifier_group, NULL,
315 subbuf_size, num_subbuf, switch_timer_interval,
316 read_timer_interval);
317 if (!event_notifier_group->chan)
318 goto create_error;
319
320 event_notifier_group->transport = transport;
321
322 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
323 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
324 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
325 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
326
327 list_add(&event_notifier_group->node, &event_notifier_groups);
328
329 mutex_unlock(&sessions_mutex);
330
331 return event_notifier_group;
332
333 create_error:
334 lttng_kvfree(event_notifier_group);
335 nomem:
336 if (transport)
337 module_put(transport->owner);
338 notransport:
339 mutex_unlock(&sessions_mutex);
340 return NULL;
341 }
342
343 void metadata_cache_destroy(struct kref *kref)
344 {
345 struct lttng_metadata_cache *cache =
346 container_of(kref, struct lttng_metadata_cache, refcount);
347 vfree(cache->data);
348 kfree(cache);
349 }
350
351 void lttng_session_destroy(struct lttng_kernel_session *session)
352 {
353 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
354 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
355 struct lttng_metadata_stream *metadata_stream;
356 struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler;
357 int ret;
358
359 mutex_lock(&sessions_mutex);
360 WRITE_ONCE(session->active, 0);
361 list_for_each_entry(chan_priv, &session->priv->chan, node) {
362 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
363 WARN_ON(ret);
364 }
365 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
366 ret = _lttng_event_unregister(&event_recorder_priv->pub->parent);
367 WARN_ON(ret);
368 }
369 synchronize_trace(); /* Wait for in-flight events to complete */
370 list_for_each_entry(chan_priv, &session->priv->chan, node) {
371 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
372 WARN_ON(ret);
373 }
374 list_for_each_entry_safe(event_recorder_enabler, tmp_event_recorder_enabler,
375 &session->priv->enablers_head, node)
376 lttng_event_enabler_destroy(&event_recorder_enabler->parent);
377 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node)
378 _lttng_event_destroy(&event_recorder_priv->pub->parent);
379 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
380 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
381 _lttng_channel_destroy(chan_priv->pub);
382 }
383 mutex_lock(&session->priv->metadata_cache->lock);
384 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
385 _lttng_metadata_channel_hangup(metadata_stream);
386 mutex_unlock(&session->priv->metadata_cache->lock);
387 lttng_id_tracker_fini(&session->pid_tracker);
388 lttng_id_tracker_fini(&session->vpid_tracker);
389 lttng_id_tracker_fini(&session->uid_tracker);
390 lttng_id_tracker_fini(&session->vuid_tracker);
391 lttng_id_tracker_fini(&session->gid_tracker);
392 lttng_id_tracker_fini(&session->vgid_tracker);
393 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
394 list_del(&session->priv->list);
395 mutex_unlock(&sessions_mutex);
396 lttng_kvfree(session->priv);
397 lttng_kvfree(session);
398 }
399
400 void lttng_event_notifier_group_destroy(
401 struct lttng_event_notifier_group *event_notifier_group)
402 {
403 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
404 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
405 int ret;
406
407 if (!event_notifier_group)
408 return;
409
410 mutex_lock(&sessions_mutex);
411
412 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
413 WARN_ON(ret);
414
415 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
416 &event_notifier_group->event_notifiers_head, node) {
417 ret = _lttng_event_unregister(&event_notifier_priv->pub->parent);
418 WARN_ON(ret);
419 }
420
421 /* Wait for in-flight event notifier to complete */
422 synchronize_trace();
423
424 irq_work_sync(&event_notifier_group->wakeup_pending);
425
426 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
427 WARN_ON(ret);
428
429 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
430 &event_notifier_group->enablers_head, node)
431 lttng_event_enabler_destroy(&event_notifier_enabler->parent);
432
433 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
434 &event_notifier_group->event_notifiers_head, node)
435 _lttng_event_destroy(&event_notifier_priv->pub->parent);
436
437 if (event_notifier_group->error_counter) {
438 struct lttng_counter *error_counter = event_notifier_group->error_counter;
439
440 error_counter->ops->counter_destroy(error_counter->counter);
441 module_put(error_counter->transport->owner);
442 lttng_kvfree(error_counter);
443 event_notifier_group->error_counter = NULL;
444 }
445
446 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
447 module_put(event_notifier_group->transport->owner);
448 list_del(&event_notifier_group->node);
449
450 mutex_unlock(&sessions_mutex);
451 lttng_kvfree(event_notifier_group);
452 }
453
454 int lttng_session_statedump(struct lttng_kernel_session *session)
455 {
456 int ret;
457
458 mutex_lock(&sessions_mutex);
459 ret = lttng_statedump_start(session);
460 mutex_unlock(&sessions_mutex);
461 return ret;
462 }
463
464 int lttng_session_enable(struct lttng_kernel_session *session)
465 {
466 int ret = 0;
467 struct lttng_kernel_channel_buffer_private *chan_priv;
468
469 mutex_lock(&sessions_mutex);
470 if (session->active) {
471 ret = -EBUSY;
472 goto end;
473 }
474
475 /* Set transient enabler state to "enabled" */
476 session->priv->tstate = 1;
477
478 /* We need to sync enablers with session before activation. */
479 lttng_session_sync_event_enablers(session);
480
481 /*
482 * Snapshot the number of events per channel to know the type of header
483 * we need to use.
484 */
485 list_for_each_entry(chan_priv, &session->priv->chan, node) {
486 if (chan_priv->header_type)
487 continue; /* don't change it if session stop/restart */
488 if (chan_priv->free_event_id < 31)
489 chan_priv->header_type = 1; /* compact */
490 else
491 chan_priv->header_type = 2; /* large */
492 }
493
494 /* Clear each stream's quiescent state. */
495 list_for_each_entry(chan_priv, &session->priv->chan, node) {
496 if (chan_priv->channel_type != METADATA_CHANNEL)
497 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
498 }
499
500 WRITE_ONCE(session->active, 1);
501 WRITE_ONCE(session->priv->been_active, 1);
502 ret = _lttng_session_metadata_statedump(session);
503 if (ret) {
504 WRITE_ONCE(session->active, 0);
505 goto end;
506 }
507 ret = lttng_statedump_start(session);
508 if (ret)
509 WRITE_ONCE(session->active, 0);
510 end:
511 mutex_unlock(&sessions_mutex);
512 return ret;
513 }
514
515 int lttng_session_disable(struct lttng_kernel_session *session)
516 {
517 int ret = 0;
518 struct lttng_kernel_channel_buffer_private *chan_priv;
519
520 mutex_lock(&sessions_mutex);
521 if (!session->active) {
522 ret = -EBUSY;
523 goto end;
524 }
525 WRITE_ONCE(session->active, 0);
526
527 /* Set transient enabler state to "disabled" */
528 session->priv->tstate = 0;
529 lttng_session_sync_event_enablers(session);
530
531 /* Set each stream's quiescent state. */
532 list_for_each_entry(chan_priv, &session->priv->chan, node) {
533 if (chan_priv->channel_type != METADATA_CHANNEL)
534 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
535 }
536 end:
537 mutex_unlock(&sessions_mutex);
538 return ret;
539 }
540
541 int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
542 {
543 int ret = 0;
544 struct lttng_kernel_channel_buffer_private *chan_priv;
545 struct lttng_kernel_event_recorder_private *event_recorder_priv;
546 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
547 struct lttng_metadata_stream *stream;
548
549 mutex_lock(&sessions_mutex);
550 if (!session->active) {
551 ret = -EBUSY;
552 goto end;
553 }
554
555 mutex_lock(&cache->lock);
556 memset(cache->data, 0, cache->cache_alloc);
557 cache->metadata_written = 0;
558 cache->version++;
559 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
560 stream->metadata_out = 0;
561 stream->metadata_in = 0;
562 }
563 mutex_unlock(&cache->lock);
564
565 session->priv->metadata_dumped = 0;
566 list_for_each_entry(chan_priv, &session->priv->chan, node) {
567 chan_priv->metadata_dumped = 0;
568 }
569
570 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
571 event_recorder_priv->metadata_dumped = 0;
572 }
573
574 ret = _lttng_session_metadata_statedump(session);
575
576 end:
577 mutex_unlock(&sessions_mutex);
578 return ret;
579 }
580
581 static
582 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
583 {
584 struct lttng_kernel_channel_buffer *chan_buf;
585
586 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
587 return false;
588 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
589 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
590 return true;
591 return false;
592 }
593
594 int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
595 {
596 int ret = 0;
597
598 mutex_lock(&sessions_mutex);
599 if (is_channel_buffer_metadata(channel)) {
600 ret = -EPERM;
601 goto end;
602 }
603 if (channel->enabled) {
604 ret = -EEXIST;
605 goto end;
606 }
607 /* Set transient enabler state to "enabled" */
608 channel->priv->tstate = 1;
609 lttng_session_sync_event_enablers(channel->session);
610 /* Set atomically the state to "enabled" */
611 WRITE_ONCE(channel->enabled, 1);
612 end:
613 mutex_unlock(&sessions_mutex);
614 return ret;
615 }
616
617 int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
618 {
619 int ret = 0;
620
621 mutex_lock(&sessions_mutex);
622 if (is_channel_buffer_metadata(channel)) {
623 ret = -EPERM;
624 goto end;
625 }
626 if (!channel->enabled) {
627 ret = -EEXIST;
628 goto end;
629 }
630 /* Set atomically the state to "disabled" */
631 WRITE_ONCE(channel->enabled, 0);
632 /* Set transient enabler state to "enabled" */
633 channel->priv->tstate = 0;
634 lttng_session_sync_event_enablers(channel->session);
635 end:
636 mutex_unlock(&sessions_mutex);
637 return ret;
638 }
639
640 int lttng_event_enable(struct lttng_kernel_event_common *event)
641 {
642 int ret = 0;
643
644 mutex_lock(&sessions_mutex);
645 switch (event->type) {
646 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
647 {
648 struct lttng_kernel_event_recorder *event_recorder =
649 container_of(event, struct lttng_kernel_event_recorder, parent);
650
651 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
652 ret = -EPERM;
653 goto end;
654 }
655 break;
656 }
657 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
658 switch (event->priv->instrumentation) {
659 case LTTNG_KERNEL_ABI_KRETPROBE:
660 ret = -EINVAL;
661 goto end;
662 default:
663 break;
664 }
665 break;
666 default:
667 break;
668 }
669
670 if (event->enabled) {
671 ret = -EEXIST;
672 goto end;
673 }
674 switch (event->priv->instrumentation) {
675 case LTTNG_KERNEL_ABI_TRACEPOINT:
676 lttng_fallthrough;
677 case LTTNG_KERNEL_ABI_SYSCALL:
678 ret = -EINVAL;
679 break;
680
681 case LTTNG_KERNEL_ABI_KPROBE:
682 lttng_fallthrough;
683 case LTTNG_KERNEL_ABI_UPROBE:
684 WRITE_ONCE(event->enabled, 1);
685 break;
686
687 case LTTNG_KERNEL_ABI_KRETPROBE:
688 ret = lttng_kretprobes_event_enable_state(event, 1);
689 break;
690
691 case LTTNG_KERNEL_ABI_FUNCTION:
692 lttng_fallthrough;
693 case LTTNG_KERNEL_ABI_NOOP:
694 lttng_fallthrough;
695 default:
696 WARN_ON_ONCE(1);
697 ret = -EINVAL;
698 }
699 end:
700 mutex_unlock(&sessions_mutex);
701 return ret;
702 }
703
704 int lttng_event_disable(struct lttng_kernel_event_common *event)
705 {
706 int ret = 0;
707
708 mutex_lock(&sessions_mutex);
709 switch (event->type) {
710 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
711 {
712 struct lttng_kernel_event_recorder *event_recorder =
713 container_of(event, struct lttng_kernel_event_recorder, parent);
714
715 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
716 ret = -EPERM;
717 goto end;
718 }
719 break;
720 }
721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
722 switch (event->priv->instrumentation) {
723 case LTTNG_KERNEL_ABI_KRETPROBE:
724 ret = -EINVAL;
725 goto end;
726 default:
727 break;
728 }
729 break;
730 default:
731 break;
732 }
733
734 if (!event->enabled) {
735 ret = -EEXIST;
736 goto end;
737 }
738 switch (event->priv->instrumentation) {
739 case LTTNG_KERNEL_ABI_TRACEPOINT:
740 lttng_fallthrough;
741 case LTTNG_KERNEL_ABI_SYSCALL:
742 ret = -EINVAL;
743 break;
744
745 case LTTNG_KERNEL_ABI_KPROBE:
746 lttng_fallthrough;
747 case LTTNG_KERNEL_ABI_UPROBE:
748 WRITE_ONCE(event->enabled, 0);
749 break;
750
751 case LTTNG_KERNEL_ABI_KRETPROBE:
752 ret = lttng_kretprobes_event_enable_state(event, 0);
753 break;
754
755 case LTTNG_KERNEL_ABI_FUNCTION:
756 lttng_fallthrough;
757 case LTTNG_KERNEL_ABI_NOOP:
758 lttng_fallthrough;
759 default:
760 WARN_ON_ONCE(1);
761 ret = -EINVAL;
762 }
763 end:
764 mutex_unlock(&sessions_mutex);
765 return ret;
766 }
767
768 struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
769 const char *transport_name,
770 void *buf_addr,
771 size_t subbuf_size, size_t num_subbuf,
772 unsigned int switch_timer_interval,
773 unsigned int read_timer_interval,
774 enum channel_type channel_type)
775 {
776 struct lttng_kernel_channel_buffer *chan;
777 struct lttng_kernel_channel_buffer_private *chan_priv;
778 struct lttng_transport *transport = NULL;
779
780 mutex_lock(&sessions_mutex);
781 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
782 goto active; /* Refuse to add channel to active session */
783 transport = lttng_transport_find(transport_name);
784 if (!transport) {
785 printk(KERN_WARNING "LTTng: transport %s not found\n",
786 transport_name);
787 goto notransport;
788 }
789 if (!try_module_get(transport->owner)) {
790 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
791 goto notransport;
792 }
793 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
794 if (!chan)
795 goto nomem;
796 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
797 if (!chan_priv)
798 goto nomem_priv;
799 chan->priv = chan_priv;
800 chan_priv->pub = chan;
801 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
802 chan->parent.session = session;
803 chan->priv->id = session->priv->free_chan_id++;
804 chan->ops = &transport->ops;
805 /*
806 * Note: the channel creation op already writes into the packet
807 * headers. Therefore the "chan" information used as input
808 * should be already accessible.
809 */
810 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
811 chan, buf_addr, subbuf_size, num_subbuf,
812 switch_timer_interval, read_timer_interval);
813 if (!chan->priv->rb_chan)
814 goto create_error;
815 chan->priv->parent.tstate = 1;
816 chan->parent.enabled = 1;
817 chan->priv->transport = transport;
818 chan->priv->channel_type = channel_type;
819 list_add(&chan->priv->node, &session->priv->chan);
820 mutex_unlock(&sessions_mutex);
821 return chan;
822
823 create_error:
824 kfree(chan_priv);
825 nomem_priv:
826 kfree(chan);
827 nomem:
828 if (transport)
829 module_put(transport->owner);
830 notransport:
831 active:
832 mutex_unlock(&sessions_mutex);
833 return NULL;
834 }
835
836 /*
837 * Only used internally at session destruction for per-cpu channels, and
838 * when metadata channel is released.
839 * Needs to be called with sessions mutex held.
840 */
841 static
842 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
843 {
844 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
845 module_put(chan->priv->transport->owner);
846 list_del(&chan->priv->node);
847 lttng_kernel_destroy_context(chan->priv->ctx);
848 kfree(chan->priv);
849 kfree(chan);
850 }
851
852 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
853 {
854 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
855
856 /* Protect the metadata cache with the sessions_mutex. */
857 mutex_lock(&sessions_mutex);
858 _lttng_channel_destroy(chan);
859 mutex_unlock(&sessions_mutex);
860 }
861 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
862
863 static
864 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
865 {
866 stream->finalized = 1;
867 wake_up_interruptible(&stream->read_wait);
868 }
869
870
871 /*
872 * Supports event creation while tracing session is active.
873 * Needs to be called with sessions mutex held.
874 */
875 static
876 struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
877 const struct lttng_kernel_event_desc *event_desc)
878 {
879 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
880 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
881 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
882 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
883 struct lttng_kernel_event_recorder *event_recorder;
884 struct lttng_kernel_event_recorder_private *event_recorder_priv;
885 struct lttng_kernel_event_common_private *event_priv;
886 const char *event_name;
887 struct hlist_head *head;
888 int ret;
889
890 if (chan->priv->free_event_id == -1U) {
891 ret = -EMFILE;
892 goto full;
893 }
894
895 switch (itype) {
896 case LTTNG_KERNEL_ABI_TRACEPOINT:
897 event_name = event_desc->event_name;
898 break;
899
900 case LTTNG_KERNEL_ABI_KPROBE:
901 lttng_fallthrough;
902 case LTTNG_KERNEL_ABI_UPROBE:
903 lttng_fallthrough;
904 case LTTNG_KERNEL_ABI_KRETPROBE:
905 lttng_fallthrough;
906 case LTTNG_KERNEL_ABI_SYSCALL:
907 event_name = event_param->name;
908 break;
909
910 case LTTNG_KERNEL_ABI_FUNCTION:
911 lttng_fallthrough;
912 case LTTNG_KERNEL_ABI_NOOP:
913 lttng_fallthrough;
914 default:
915 WARN_ON_ONCE(1);
916 ret = -EINVAL;
917 goto type_error;
918 }
919
920 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
921 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
922 event_recorder_priv = container_of(event_priv, struct lttng_kernel_event_recorder_private, parent);
923
924 WARN_ON_ONCE(!event_priv->desc);
925 if (!strncmp(event_priv->desc->event_name, event_name,
926 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
927 && chan == event_recorder_priv->pub->chan) {
928 ret = -EEXIST;
929 goto exist;
930 }
931 }
932
933 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
934 if (!event_recorder) {
935 ret = -ENOMEM;
936 goto cache_error;
937 }
938 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
939 if (!event_recorder_priv) {
940 ret = -ENOMEM;
941 goto cache_private_error;
942 }
943 event_recorder_priv->pub = event_recorder;
944 event_recorder_priv->parent.pub = &event_recorder->parent;
945 event_recorder->priv = event_recorder_priv;
946 event_recorder->parent.priv = &event_recorder_priv->parent;
947 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
948
949 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
950 event_recorder->chan = chan;
951 event_recorder->priv->id = chan->priv->free_event_id++;
952 event_recorder->priv->parent.instrumentation = itype;
953 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
954 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
955
956 switch (itype) {
957 case LTTNG_KERNEL_ABI_TRACEPOINT:
958 /* Event will be enabled by enabler sync. */
959 event_recorder->parent.enabled = 0;
960 event_recorder->priv->parent.registered = 0;
961 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
962 if (!event_recorder->priv->parent.desc) {
963 ret = -ENOENT;
964 goto register_error;
965 }
966 /* Populate lttng_event structure before event registration. */
967 smp_wmb();
968 break;
969
970 case LTTNG_KERNEL_ABI_KPROBE:
971 /*
972 * Needs to be explicitly enabled after creation, since
973 * we may want to apply filters.
974 */
975 event_recorder->parent.enabled = 0;
976 event_recorder->priv->parent.registered = 1;
977 /*
978 * Populate lttng_event structure before event
979 * registration.
980 */
981 smp_wmb();
982 ret = lttng_kprobes_register_event(event_name,
983 event_param->u.kprobe.symbol_name,
984 event_param->u.kprobe.offset,
985 event_param->u.kprobe.addr,
986 &event_recorder->parent);
987 if (ret) {
988 ret = -EINVAL;
989 goto register_error;
990 }
991 ret = try_module_get(event_recorder->priv->parent.desc->owner);
992 WARN_ON_ONCE(!ret);
993 break;
994
995 case LTTNG_KERNEL_ABI_KRETPROBE:
996 {
997 struct lttng_kernel_event_recorder *event_recorder_return;
998 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
999
1000 /* kretprobe defines 2 events */
1001 /*
1002 * Needs to be explicitly enabled after creation, since
1003 * we may want to apply filters.
1004 */
1005 event_recorder->parent.enabled = 0;
1006 event_recorder->priv->parent.registered = 1;
1007
1008 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
1009 if (!event_recorder_return) {
1010 ret = -ENOMEM;
1011 goto register_error;
1012 }
1013 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1014 if (!event_recorder_return_priv) {
1015 kmem_cache_free(event_recorder_cache, event_recorder_return);
1016 ret = -ENOMEM;
1017 goto register_error;
1018 }
1019 event_recorder_return_priv->pub = event_recorder_return;
1020 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1021 event_recorder_return->priv = event_recorder_return_priv;
1022 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1023 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1024
1025 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
1026 event_recorder_return->chan = chan;
1027 event_recorder_return->priv->id = chan->priv->free_event_id++;
1028 event_recorder_return->priv->parent.instrumentation = itype;
1029 event_recorder_return->parent.enabled = 0;
1030 event_recorder_return->priv->parent.registered = 1;
1031 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1032 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
1033 /*
1034 * Populate lttng_event structure before kretprobe registration.
1035 */
1036 smp_wmb();
1037 ret = lttng_kretprobes_register(event_name,
1038 event_param->u.kretprobe.symbol_name,
1039 event_param->u.kretprobe.offset,
1040 event_param->u.kretprobe.addr,
1041 &event_recorder->parent, &event_recorder_return->parent);
1042 if (ret) {
1043 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1044 kmem_cache_free(event_recorder_cache, event_recorder_return);
1045 ret = -EINVAL;
1046 goto register_error;
1047 }
1048 /* Take 2 refs on the module: one per event. */
1049 ret = try_module_get(event_recorder->priv->parent.desc->owner);
1050 WARN_ON_ONCE(!ret);
1051 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
1052 WARN_ON_ONCE(!ret);
1053 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
1054 event_recorder_return);
1055 WARN_ON_ONCE(ret > 0);
1056 if (ret) {
1057 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1058 kmem_cache_free(event_recorder_cache, event_recorder_return);
1059 module_put(event_recorder_return->priv->parent.desc->owner);
1060 module_put(event_recorder->priv->parent.desc->owner);
1061 goto statedump_error;
1062 }
1063 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
1064 break;
1065 }
1066
1067 case LTTNG_KERNEL_ABI_SYSCALL:
1068 /*
1069 * Needs to be explicitly enabled after creation, since
1070 * we may want to apply filters.
1071 */
1072 event_recorder->parent.enabled = 0;
1073 event_recorder->priv->parent.registered = 0;
1074 event_recorder->priv->parent.desc = event_desc;
1075 switch (event_param->u.syscall.entryexit) {
1076 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
1077 ret = -EINVAL;
1078 goto register_error;
1079 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1080 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1081 break;
1082 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1083 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1084 break;
1085 }
1086 switch (event_param->u.syscall.abi) {
1087 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
1088 ret = -EINVAL;
1089 goto register_error;
1090 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
1091 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1092 break;
1093 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
1094 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1095 break;
1096 }
1097 if (!event_recorder->priv->parent.desc) {
1098 ret = -EINVAL;
1099 goto register_error;
1100 }
1101 break;
1102
1103 case LTTNG_KERNEL_ABI_UPROBE:
1104 /*
1105 * Needs to be explicitly enabled after creation, since
1106 * we may want to apply filters.
1107 */
1108 event_recorder->parent.enabled = 0;
1109 event_recorder->priv->parent.registered = 1;
1110
1111 /*
1112 * Populate lttng_event structure before event
1113 * registration.
1114 */
1115 smp_wmb();
1116
1117 ret = lttng_uprobes_register_event(event_param->name,
1118 event_param->u.uprobe.fd,
1119 &event_recorder->parent);
1120 if (ret)
1121 goto register_error;
1122 ret = try_module_get(event_recorder->priv->parent.desc->owner);
1123 WARN_ON_ONCE(!ret);
1124 break;
1125
1126 case LTTNG_KERNEL_ABI_FUNCTION:
1127 lttng_fallthrough;
1128 case LTTNG_KERNEL_ABI_NOOP:
1129 lttng_fallthrough;
1130 default:
1131 WARN_ON_ONCE(1);
1132 ret = -EINVAL;
1133 goto register_error;
1134 }
1135 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
1136 WARN_ON_ONCE(ret > 0);
1137 if (ret) {
1138 goto statedump_error;
1139 }
1140 hlist_add_head(&event_recorder->priv->parent.hlist_node, head);
1141 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
1142 return event_recorder;
1143
1144 statedump_error:
1145 /* If a statedump error occurs, events will not be readable. */
1146 register_error:
1147 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1148 cache_private_error:
1149 kmem_cache_free(event_recorder_cache, event_recorder);
1150 cache_error:
1151 exist:
1152 type_error:
1153 full:
1154 return ERR_PTR(ret);
1155 }
1156
1157 static
1158 struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler,
1159 const struct lttng_kernel_event_desc *event_desc)
1160 {
1161 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
1162 struct lttng_event_notifier_group *event_notifier_group = event_enabler->group;
1163 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
1164 uint64_t token = event_enabler->parent.user_token;
1165 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
1166 struct lttng_kernel_event_notifier *event_notifier;
1167 struct lttng_kernel_event_notifier_private *event_notifier_priv;
1168 struct lttng_kernel_event_common_private *event_priv;
1169 struct lttng_counter *error_counter;
1170 const char *event_name;
1171 struct hlist_head *head;
1172 int ret;
1173
1174 switch (itype) {
1175 case LTTNG_KERNEL_ABI_TRACEPOINT:
1176 event_name = event_desc->event_name;
1177 break;
1178
1179 case LTTNG_KERNEL_ABI_KPROBE:
1180 lttng_fallthrough;
1181 case LTTNG_KERNEL_ABI_UPROBE:
1182 lttng_fallthrough;
1183 case LTTNG_KERNEL_ABI_SYSCALL:
1184 event_name = event_param->name;
1185 break;
1186
1187 case LTTNG_KERNEL_ABI_KRETPROBE:
1188 lttng_fallthrough;
1189 case LTTNG_KERNEL_ABI_FUNCTION:
1190 lttng_fallthrough;
1191 case LTTNG_KERNEL_ABI_NOOP:
1192 lttng_fallthrough;
1193 default:
1194 WARN_ON_ONCE(1);
1195 ret = -EINVAL;
1196 goto type_error;
1197 }
1198
1199 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
1200 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
1201 event_notifier_priv = container_of(event_priv, struct lttng_kernel_event_notifier_private, parent);
1202
1203 WARN_ON_ONCE(!event_priv->desc);
1204 if (!strncmp(event_priv->desc->event_name, event_name,
1205 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
1206 && event_notifier_group == event_notifier_priv->group
1207 && token == event_priv->user_token) {
1208 ret = -EEXIST;
1209 goto exist;
1210 }
1211 }
1212
1213 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1214 if (!event_notifier) {
1215 ret = -ENOMEM;
1216 goto cache_error;
1217 }
1218 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1219 if (!event_notifier_priv) {
1220 ret = -ENOMEM;
1221 goto cache_private_error;
1222 }
1223 event_notifier_priv->pub = event_notifier;
1224 event_notifier_priv->parent.pub = &event_notifier->parent;
1225 event_notifier->priv = event_notifier_priv;
1226 event_notifier->parent.priv = &event_notifier_priv->parent;
1227 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1228
1229 event_notifier->priv->group = event_notifier_group;
1230 event_notifier->priv->parent.user_token = event_enabler->parent.user_token;
1231 event_notifier->priv->error_counter_index = event_enabler->error_counter_index;
1232 event_notifier->priv->num_captures = 0;
1233 event_notifier->priv->parent.instrumentation = itype;
1234 event_notifier->notification_send = lttng_event_notifier_notification_send;
1235 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1236 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1237 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
1238 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
1239
1240 switch (itype) {
1241 case LTTNG_KERNEL_ABI_TRACEPOINT:
1242 /* Event will be enabled by enabler sync. */
1243 event_notifier->parent.enabled = 0;
1244 event_notifier->priv->parent.registered = 0;
1245 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1246 if (!event_notifier->priv->parent.desc) {
1247 ret = -ENOENT;
1248 goto register_error;
1249 }
1250 /* Populate lttng_event_notifier structure before event registration. */
1251 smp_wmb();
1252 break;
1253
1254 case LTTNG_KERNEL_ABI_KPROBE:
1255 /*
1256 * Needs to be explicitly enabled after creation, since
1257 * we may want to apply filters.
1258 */
1259 event_notifier->parent.enabled = 0;
1260 event_notifier->priv->parent.registered = 1;
1261 /*
1262 * Populate lttng_event_notifier structure before event
1263 * registration.
1264 */
1265 smp_wmb();
1266 ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name,
1267 event_param->u.kprobe.symbol_name,
1268 event_param->u.kprobe.offset,
1269 event_param->u.kprobe.addr,
1270 &event_notifier->parent);
1271 if (ret) {
1272 ret = -EINVAL;
1273 goto register_error;
1274 }
1275 ret = try_module_get(event_notifier->priv->parent.desc->owner);
1276 WARN_ON_ONCE(!ret);
1277 break;
1278
1279 case LTTNG_KERNEL_ABI_SYSCALL:
1280 /*
1281 * Needs to be explicitly enabled after creation, since
1282 * we may want to apply filters.
1283 */
1284 event_notifier->parent.enabled = 0;
1285 event_notifier->priv->parent.registered = 0;
1286 event_notifier->priv->parent.desc = event_desc;
1287 switch (event_param->u.syscall.entryexit) {
1288 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
1289 ret = -EINVAL;
1290 goto register_error;
1291 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1292 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1293 break;
1294 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1295 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1296 break;
1297 }
1298 switch (event_param->u.syscall.abi) {
1299 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
1300 ret = -EINVAL;
1301 goto register_error;
1302 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
1303 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1304 break;
1305 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
1306 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1307 break;
1308 }
1309
1310 if (!event_notifier->priv->parent.desc) {
1311 ret = -EINVAL;
1312 goto register_error;
1313 }
1314 break;
1315
1316 case LTTNG_KERNEL_ABI_UPROBE:
1317 /*
1318 * Needs to be explicitly enabled after creation, since
1319 * we may want to apply filters.
1320 */
1321 event_notifier->parent.enabled = 0;
1322 event_notifier->priv->parent.registered = 1;
1323
1324 /*
1325 * Populate lttng_event_notifier structure before
1326 * event_notifier registration.
1327 */
1328 smp_wmb();
1329
1330 ret = lttng_uprobes_register_event(event_param->name,
1331 event_param->u.uprobe.fd,
1332 &event_notifier->parent);
1333 if (ret)
1334 goto register_error;
1335 ret = try_module_get(event_notifier->priv->parent.desc->owner);
1336 WARN_ON_ONCE(!ret);
1337 break;
1338
1339 case LTTNG_KERNEL_ABI_KRETPROBE:
1340 lttng_fallthrough;
1341 case LTTNG_KERNEL_ABI_FUNCTION:
1342 lttng_fallthrough;
1343 case LTTNG_KERNEL_ABI_NOOP:
1344 lttng_fallthrough;
1345 default:
1346 WARN_ON_ONCE(1);
1347 ret = -EINVAL;
1348 goto register_error;
1349 }
1350
1351 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1352 hlist_add_head(&event_notifier->priv->parent.hlist_node, head);
1353
1354 /*
1355 * Clear the error counter bucket. The sessiond keeps track of which
1356 * bucket is currently in use. We trust it. The session lock
1357 * synchronizes against concurrent creation of the error
1358 * counter.
1359 */
1360 error_counter = event_notifier_group->error_counter;
1361 if (error_counter) {
1362 size_t dimension_index[1];
1363
1364 /*
1365 * Check that the index is within the boundary of the counter.
1366 */
1367 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
1368 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1369 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1370 ret = -EINVAL;
1371 goto register_error;
1372 }
1373
1374 dimension_index[0] = event_notifier->priv->error_counter_index;
1375 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1376 if (ret) {
1377 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1378 event_notifier->priv->error_counter_index);
1379 goto register_error;
1380 }
1381 }
1382
1383 return event_notifier;
1384
1385 register_error:
1386 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1387 cache_private_error:
1388 kmem_cache_free(event_notifier_cache, event_notifier);
1389 cache_error:
1390 exist:
1391 type_error:
1392 return ERR_PTR(ret);
1393 }
1394
1395 struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1396 const struct lttng_kernel_event_desc *event_desc)
1397 {
1398 switch (event_enabler->enabler_type) {
1399 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1400 {
1401 struct lttng_event_recorder_enabler *event_recorder_enabler =
1402 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1403 struct lttng_kernel_event_recorder *event_recorder;
1404
1405 event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc);
1406 if (!event_recorder)
1407 return NULL;
1408 return &event_recorder->parent;
1409 }
1410 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1411 {
1412 struct lttng_event_notifier_enabler *event_notifier_enabler =
1413 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1414 struct lttng_kernel_event_notifier *event_notifier;
1415
1416 event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc);
1417 if (!event_notifier)
1418 return NULL;
1419 return &event_notifier->parent;
1420 }
1421 default:
1422 return NULL;
1423 }
1424 }
1425
1426 struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1427 const struct lttng_kernel_event_desc *event_desc)
1428 {
1429 struct lttng_kernel_event_common *event;
1430
1431 mutex_lock(&sessions_mutex);
1432 event = _lttng_kernel_event_create(event_enabler, event_desc);
1433 mutex_unlock(&sessions_mutex);
1434 return event;
1435 }
1436
1437
1438
1439 int lttng_kernel_counter_read(struct lttng_counter *counter,
1440 const size_t *dim_indexes, int32_t cpu,
1441 int64_t *val, bool *overflow, bool *underflow)
1442 {
1443 return counter->ops->counter_read(counter->counter, dim_indexes,
1444 cpu, val, overflow, underflow);
1445 }
1446
1447 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1448 const size_t *dim_indexes, int64_t *val,
1449 bool *overflow, bool *underflow)
1450 {
1451 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1452 val, overflow, underflow);
1453 }
1454
1455 int lttng_kernel_counter_clear(struct lttng_counter *counter,
1456 const size_t *dim_indexes)
1457 {
1458 return counter->ops->counter_clear(counter->counter, dim_indexes);
1459 }
1460
1461 /* Only used for tracepoints for now. */
1462 static
1463 void register_event(struct lttng_kernel_event_common *event)
1464 {
1465 const struct lttng_kernel_event_desc *desc;
1466 int ret = -EINVAL;
1467
1468 if (event->priv->registered)
1469 return;
1470
1471 desc = event->priv->desc;
1472 switch (event->priv->instrumentation) {
1473 case LTTNG_KERNEL_ABI_TRACEPOINT:
1474 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
1475 desc->tp_class->probe_callback,
1476 event);
1477 break;
1478
1479 case LTTNG_KERNEL_ABI_SYSCALL:
1480 ret = lttng_syscall_filter_enable_event(event);
1481 break;
1482
1483 case LTTNG_KERNEL_ABI_KPROBE:
1484 lttng_fallthrough;
1485 case LTTNG_KERNEL_ABI_UPROBE:
1486 ret = 0;
1487 break;
1488
1489 case LTTNG_KERNEL_ABI_KRETPROBE:
1490 switch (event->type) {
1491 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1492 ret = 0;
1493 break;
1494 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1495 WARN_ON_ONCE(1);
1496 break;
1497 }
1498 break;
1499
1500 case LTTNG_KERNEL_ABI_FUNCTION:
1501 lttng_fallthrough;
1502 case LTTNG_KERNEL_ABI_NOOP:
1503 lttng_fallthrough;
1504 default:
1505 WARN_ON_ONCE(1);
1506 }
1507 if (!ret)
1508 event->priv->registered = 1;
1509 }
1510
1511 int _lttng_event_unregister(struct lttng_kernel_event_common *event)
1512 {
1513 struct lttng_kernel_event_common_private *event_priv = event->priv;
1514 const struct lttng_kernel_event_desc *desc;
1515 int ret = -EINVAL;
1516
1517 if (!event_priv->registered)
1518 return 0;
1519
1520 desc = event_priv->desc;
1521 switch (event_priv->instrumentation) {
1522 case LTTNG_KERNEL_ABI_TRACEPOINT:
1523 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
1524 event_priv->desc->tp_class->probe_callback,
1525 event);
1526 break;
1527
1528 case LTTNG_KERNEL_ABI_KPROBE:
1529 lttng_kprobes_unregister_event(event);
1530 ret = 0;
1531 break;
1532
1533 case LTTNG_KERNEL_ABI_KRETPROBE:
1534 switch (event->type) {
1535 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1536 lttng_kretprobes_unregister(event);
1537 ret = 0;
1538 break;
1539 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1540 WARN_ON_ONCE(1);
1541 break;
1542 }
1543 break;
1544
1545 case LTTNG_KERNEL_ABI_SYSCALL:
1546 ret = lttng_syscall_filter_disable_event(event);
1547 break;
1548
1549 case LTTNG_KERNEL_ABI_NOOP:
1550 switch (event->type) {
1551 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1552 ret = 0;
1553 break;
1554 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1555 WARN_ON_ONCE(1);
1556 break;
1557 }
1558 break;
1559
1560 case LTTNG_KERNEL_ABI_UPROBE:
1561 lttng_uprobes_unregister_event(event);
1562 ret = 0;
1563 break;
1564
1565 case LTTNG_KERNEL_ABI_FUNCTION:
1566 lttng_fallthrough;
1567 default:
1568 WARN_ON_ONCE(1);
1569 }
1570 if (!ret)
1571 event_priv->registered = 0;
1572 return ret;
1573 }
1574
1575 /*
1576 * Only used internally at session destruction.
1577 */
1578 static
1579 void _lttng_event_destroy(struct lttng_kernel_event_common *event)
1580 {
1581 struct lttng_kernel_event_common_private *event_priv = event->priv;
1582 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1583
1584 lttng_free_event_filter_runtime(event);
1585 /* Free event enabler refs */
1586 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1587 &event_priv->enablers_ref_head, node)
1588 kfree(enabler_ref);
1589
1590 switch (event->type) {
1591 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1592 {
1593 struct lttng_kernel_event_recorder *event_recorder =
1594 container_of(event, struct lttng_kernel_event_recorder, parent);
1595
1596 switch (event_priv->instrumentation) {
1597 case LTTNG_KERNEL_ABI_TRACEPOINT:
1598 lttng_event_desc_put(event_priv->desc);
1599 break;
1600
1601 case LTTNG_KERNEL_ABI_KPROBE:
1602 module_put(event_priv->desc->owner);
1603 lttng_kprobes_destroy_event_private(&event_recorder->parent);
1604 break;
1605
1606 case LTTNG_KERNEL_ABI_KRETPROBE:
1607 module_put(event_priv->desc->owner);
1608 lttng_kretprobes_destroy_private(&event_recorder->parent);
1609 break;
1610
1611 case LTTNG_KERNEL_ABI_SYSCALL:
1612 break;
1613
1614 case LTTNG_KERNEL_ABI_UPROBE:
1615 module_put(event_priv->desc->owner);
1616 lttng_uprobes_destroy_event_private(&event_recorder->parent);
1617 break;
1618
1619 case LTTNG_KERNEL_ABI_FUNCTION:
1620 lttng_fallthrough;
1621 case LTTNG_KERNEL_ABI_NOOP:
1622 lttng_fallthrough;
1623 default:
1624 WARN_ON_ONCE(1);
1625 }
1626 list_del(&event_recorder->priv->node);
1627 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1628 kmem_cache_free(event_recorder_cache, event_recorder);
1629 break;
1630 }
1631 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1632 {
1633 struct lttng_kernel_event_notifier *event_notifier =
1634 container_of(event, struct lttng_kernel_event_notifier, parent);
1635
1636 switch (event_notifier->priv->parent.instrumentation) {
1637 case LTTNG_KERNEL_ABI_TRACEPOINT:
1638 lttng_event_desc_put(event_notifier->priv->parent.desc);
1639 break;
1640
1641 case LTTNG_KERNEL_ABI_KPROBE:
1642 module_put(event_notifier->priv->parent.desc->owner);
1643 lttng_kprobes_destroy_event_private(&event_notifier->parent);
1644 break;
1645
1646 case LTTNG_KERNEL_ABI_SYSCALL:
1647 break;
1648
1649 case LTTNG_KERNEL_ABI_UPROBE:
1650 module_put(event_notifier->priv->parent.desc->owner);
1651 lttng_uprobes_destroy_event_private(&event_notifier->parent);
1652 break;
1653
1654 case LTTNG_KERNEL_ABI_KRETPROBE:
1655 lttng_fallthrough;
1656 case LTTNG_KERNEL_ABI_FUNCTION:
1657 lttng_fallthrough;
1658 case LTTNG_KERNEL_ABI_NOOP:
1659 lttng_fallthrough;
1660 default:
1661 WARN_ON_ONCE(1);
1662 }
1663 list_del(&event_notifier->priv->node);
1664 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1665 kmem_cache_free(event_notifier_cache, event_notifier);
1666 break;
1667 }
1668 default:
1669 WARN_ON_ONCE(1);
1670 }
1671 }
1672
1673 struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
1674 enum tracker_type tracker_type)
1675 {
1676 switch (tracker_type) {
1677 case TRACKER_PID:
1678 return &session->pid_tracker;
1679 case TRACKER_VPID:
1680 return &session->vpid_tracker;
1681 case TRACKER_UID:
1682 return &session->uid_tracker;
1683 case TRACKER_VUID:
1684 return &session->vuid_tracker;
1685 case TRACKER_GID:
1686 return &session->gid_tracker;
1687 case TRACKER_VGID:
1688 return &session->vgid_tracker;
1689 default:
1690 WARN_ON_ONCE(1);
1691 return NULL;
1692 }
1693 }
1694
1695 int lttng_session_track_id(struct lttng_kernel_session *session,
1696 enum tracker_type tracker_type, int id)
1697 {
1698 struct lttng_kernel_id_tracker *tracker;
1699 int ret;
1700
1701 tracker = get_tracker(session, tracker_type);
1702 if (!tracker)
1703 return -EINVAL;
1704 if (id < -1)
1705 return -EINVAL;
1706 mutex_lock(&sessions_mutex);
1707 if (id == -1) {
1708 /* track all ids: destroy tracker. */
1709 lttng_id_tracker_destroy(tracker, true);
1710 ret = 0;
1711 } else {
1712 ret = lttng_id_tracker_add(tracker, id);
1713 }
1714 mutex_unlock(&sessions_mutex);
1715 return ret;
1716 }
1717
1718 int lttng_session_untrack_id(struct lttng_kernel_session *session,
1719 enum tracker_type tracker_type, int id)
1720 {
1721 struct lttng_kernel_id_tracker *tracker;
1722 int ret;
1723
1724 tracker = get_tracker(session, tracker_type);
1725 if (!tracker)
1726 return -EINVAL;
1727 if (id < -1)
1728 return -EINVAL;
1729 mutex_lock(&sessions_mutex);
1730 if (id == -1) {
1731 /* untrack all ids: replace by empty tracker. */
1732 ret = lttng_id_tracker_empty_set(tracker);
1733 } else {
1734 ret = lttng_id_tracker_del(tracker, id);
1735 }
1736 mutex_unlock(&sessions_mutex);
1737 return ret;
1738 }
1739
1740 static
1741 void *id_list_start(struct seq_file *m, loff_t *pos)
1742 {
1743 struct lttng_kernel_id_tracker *id_tracker = m->private;
1744 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
1745 struct lttng_id_hash_node *e;
1746 int iter = 0, i;
1747
1748 mutex_lock(&sessions_mutex);
1749 if (id_tracker_p) {
1750 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1751 struct hlist_head *head = &id_tracker_p->id_hash[i];
1752
1753 lttng_hlist_for_each_entry(e, head, hlist) {
1754 if (iter++ >= *pos)
1755 return e;
1756 }
1757 }
1758 } else {
1759 /* ID tracker disabled. */
1760 if (iter >= *pos && iter == 0) {
1761 return id_tracker_p; /* empty tracker */
1762 }
1763 iter++;
1764 }
1765 /* End of list */
1766 return NULL;
1767 }
1768
1769 /* Called with sessions_mutex held. */
1770 static
1771 void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
1772 {
1773 struct lttng_kernel_id_tracker *id_tracker = m->private;
1774 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
1775 struct lttng_id_hash_node *e;
1776 int iter = 0, i;
1777
1778 (*ppos)++;
1779 if (id_tracker_p) {
1780 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1781 struct hlist_head *head = &id_tracker_p->id_hash[i];
1782
1783 lttng_hlist_for_each_entry(e, head, hlist) {
1784 if (iter++ >= *ppos)
1785 return e;
1786 }
1787 }
1788 } else {
1789 /* ID tracker disabled. */
1790 if (iter >= *ppos && iter == 0)
1791 return p; /* empty tracker */
1792 iter++;
1793 }
1794
1795 /* End of list */
1796 return NULL;
1797 }
1798
1799 static
1800 void id_list_stop(struct seq_file *m, void *p)
1801 {
1802 mutex_unlock(&sessions_mutex);
1803 }
1804
1805 static
1806 int id_list_show(struct seq_file *m, void *p)
1807 {
1808 struct lttng_kernel_id_tracker *id_tracker = m->private;
1809 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
1810 int id;
1811
1812 if (p == id_tracker_p) {
1813 /* Tracker disabled. */
1814 id = -1;
1815 } else {
1816 const struct lttng_id_hash_node *e = p;
1817
1818 id = lttng_id_tracker_get_node_id(e);
1819 }
1820 switch (id_tracker->priv->tracker_type) {
1821 case TRACKER_PID:
1822 seq_printf(m, "process { pid = %d; };\n", id);
1823 break;
1824 case TRACKER_VPID:
1825 seq_printf(m, "process { vpid = %d; };\n", id);
1826 break;
1827 case TRACKER_UID:
1828 seq_printf(m, "user { uid = %d; };\n", id);
1829 break;
1830 case TRACKER_VUID:
1831 seq_printf(m, "user { vuid = %d; };\n", id);
1832 break;
1833 case TRACKER_GID:
1834 seq_printf(m, "group { gid = %d; };\n", id);
1835 break;
1836 case TRACKER_VGID:
1837 seq_printf(m, "group { vgid = %d; };\n", id);
1838 break;
1839 default:
1840 seq_printf(m, "UNKNOWN { field = %d };\n", id);
1841 }
1842 return 0;
1843 }
1844
1845 static
1846 const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1847 .start = id_list_start,
1848 .next = id_list_next,
1849 .stop = id_list_stop,
1850 .show = id_list_show,
1851 };
1852
1853 static
1854 int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
1855 {
1856 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
1857 }
1858
1859 static
1860 int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
1861 {
1862 struct seq_file *m = file->private_data;
1863 struct lttng_kernel_id_tracker *id_tracker = m->private;
1864 int ret;
1865
1866 WARN_ON_ONCE(!id_tracker);
1867 ret = seq_release(inode, file);
1868 if (!ret)
1869 fput(id_tracker->priv->session->priv->file);
1870 return ret;
1871 }
1872
1873 const struct file_operations lttng_tracker_ids_list_fops = {
1874 .owner = THIS_MODULE,
1875 .open = lttng_tracker_ids_list_open,
1876 .read = seq_read,
1877 .llseek = seq_lseek,
1878 .release = lttng_tracker_ids_list_release,
1879 };
1880
1881 int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
1882 enum tracker_type tracker_type)
1883 {
1884 struct file *tracker_ids_list_file;
1885 struct seq_file *m;
1886 int file_fd, ret;
1887
1888 file_fd = lttng_get_unused_fd();
1889 if (file_fd < 0) {
1890 ret = file_fd;
1891 goto fd_error;
1892 }
1893
1894 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1895 &lttng_tracker_ids_list_fops,
1896 NULL, O_RDWR);
1897 if (IS_ERR(tracker_ids_list_file)) {
1898 ret = PTR_ERR(tracker_ids_list_file);
1899 goto file_error;
1900 }
1901 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
1902 ret = -EOVERFLOW;
1903 goto refcount_error;
1904 }
1905 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
1906 if (ret < 0)
1907 goto open_error;
1908 m = tracker_ids_list_file->private_data;
1909
1910 m->private = get_tracker(session, tracker_type);
1911 BUG_ON(!m->private);
1912 fd_install(file_fd, tracker_ids_list_file);
1913
1914 return file_fd;
1915
1916 open_error:
1917 atomic_long_dec(&session->priv->file->f_count);
1918 refcount_error:
1919 fput(tracker_ids_list_file);
1920 file_error:
1921 put_unused_fd(file_fd);
1922 fd_error:
1923 return ret;
1924 }
1925
1926 /*
1927 * Enabler management.
1928 */
1929 static
1930 int lttng_match_enabler_star_glob(const char *desc_name,
1931 const char *pattern)
1932 {
1933 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1934 desc_name, LTTNG_SIZE_MAX))
1935 return 0;
1936 return 1;
1937 }
1938
1939 static
1940 int lttng_match_enabler_name(const char *desc_name,
1941 const char *name)
1942 {
1943 if (strcmp(desc_name, name))
1944 return 0;
1945 return 1;
1946 }
1947
1948 static
1949 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
1950 struct lttng_event_enabler_common *enabler)
1951 {
1952 const char *desc_name, *enabler_name;
1953 bool compat = false, entry = false;
1954
1955 enabler_name = enabler->event_param.name;
1956 switch (enabler->event_param.instrumentation) {
1957 case LTTNG_KERNEL_ABI_TRACEPOINT:
1958 desc_name = desc->event_name;
1959 switch (enabler->format_type) {
1960 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
1961 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1962 case LTTNG_ENABLER_FORMAT_NAME:
1963 return lttng_match_enabler_name(desc_name, enabler_name);
1964 default:
1965 return -EINVAL;
1966 }
1967 break;
1968
1969 case LTTNG_KERNEL_ABI_SYSCALL:
1970 desc_name = desc->event_name;
1971 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
1972 desc_name += strlen("compat_");
1973 compat = true;
1974 }
1975 if (!strncmp(desc_name, "syscall_exit_",
1976 strlen("syscall_exit_"))) {
1977 desc_name += strlen("syscall_exit_");
1978 } else if (!strncmp(desc_name, "syscall_entry_",
1979 strlen("syscall_entry_"))) {
1980 desc_name += strlen("syscall_entry_");
1981 entry = true;
1982 } else {
1983 WARN_ON_ONCE(1);
1984 return -EINVAL;
1985 }
1986 switch (enabler->event_param.u.syscall.entryexit) {
1987 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
1988 break;
1989 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1990 if (!entry)
1991 return 0;
1992 break;
1993 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1994 if (entry)
1995 return 0;
1996 break;
1997 default:
1998 return -EINVAL;
1999 }
2000 switch (enabler->event_param.u.syscall.abi) {
2001 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
2002 break;
2003 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
2004 if (compat)
2005 return 0;
2006 break;
2007 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
2008 if (!compat)
2009 return 0;
2010 break;
2011 default:
2012 return -EINVAL;
2013 }
2014 switch (enabler->event_param.u.syscall.match) {
2015 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
2016 switch (enabler->format_type) {
2017 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
2018 return lttng_match_enabler_star_glob(desc_name, enabler_name);
2019 case LTTNG_ENABLER_FORMAT_NAME:
2020 return lttng_match_enabler_name(desc_name, enabler_name);
2021 default:
2022 return -EINVAL;
2023 }
2024 break;
2025 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
2026 return -EINVAL; /* Not implemented. */
2027 default:
2028 return -EINVAL;
2029 }
2030 break;
2031
2032 default:
2033 WARN_ON_ONCE(1);
2034 return -EINVAL;
2035 }
2036 }
2037
2038 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
2039 struct lttng_event_enabler_common *enabler)
2040 {
2041 int ret;
2042
2043 ret = lttng_desc_match_enabler_check(desc, enabler);
2044 if (ret < 0) {
2045 WARN_ON_ONCE(1);
2046 return false;
2047 }
2048 return ret;
2049 }
2050
2051 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
2052 struct lttng_kernel_event_common *event)
2053 {
2054 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2055 return false;
2056
2057 switch (event_enabler->enabler_type) {
2058 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2059 {
2060 struct lttng_event_recorder_enabler *event_recorder_enabler =
2061 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2062 struct lttng_kernel_event_recorder *event_recorder =
2063 container_of(event, struct lttng_kernel_event_recorder, parent);
2064
2065 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2066 && event_recorder->chan == event_recorder_enabler->chan)
2067 return true;
2068 else
2069 return false;
2070 }
2071 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2072 {
2073 struct lttng_event_notifier_enabler *event_notifier_enabler =
2074 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2075 struct lttng_kernel_event_notifier *event_notifier =
2076 container_of(event, struct lttng_kernel_event_notifier, parent);
2077
2078 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2079 && event_notifier->priv->group == event_notifier_enabler->group
2080 && event->priv->user_token == event_enabler->user_token)
2081 return true;
2082 else
2083 return false;
2084 }
2085 default:
2086 WARN_ON_ONCE(1);
2087 return false;
2088 }
2089 }
2090
2091 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
2092 const struct lttng_kernel_event_desc *desc,
2093 struct lttng_kernel_event_common *event)
2094 {
2095 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2096 return false;
2097
2098 switch (event_enabler->enabler_type) {
2099 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2100 {
2101 struct lttng_event_recorder_enabler *event_recorder_enabler =
2102 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2103 struct lttng_kernel_event_recorder *event_recorder =
2104 container_of(event, struct lttng_kernel_event_recorder, parent);
2105
2106 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
2107 return true;
2108 else
2109 return false;
2110 }
2111 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2112 {
2113 struct lttng_event_notifier_enabler *event_notifier_enabler =
2114 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2115 struct lttng_kernel_event_notifier *event_notifier =
2116 container_of(event, struct lttng_kernel_event_notifier, parent);
2117
2118 if (event->priv->desc == desc
2119 && event_notifier->priv->group == event_notifier_enabler->group
2120 && event->priv->user_token == event_enabler->user_token)
2121 return true;
2122 else
2123 return false;
2124 }
2125 default:
2126 WARN_ON_ONCE(1);
2127 return false;
2128 }
2129 }
2130
2131 static
2132 struct lttng_enabler_ref *lttng_enabler_ref(
2133 struct list_head *enablers_ref_list,
2134 struct lttng_event_enabler_common *enabler)
2135 {
2136 struct lttng_enabler_ref *enabler_ref;
2137
2138 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
2139 if (enabler_ref->ref == enabler)
2140 return enabler_ref;
2141 }
2142 return NULL;
2143 }
2144
2145 static
2146 void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
2147 {
2148 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
2149 struct lttng_kernel_probe_desc *probe_desc;
2150 const struct lttng_kernel_event_desc *desc;
2151 int i;
2152 struct list_head *probe_list;
2153
2154 probe_list = lttng_get_probe_list_head();
2155 /*
2156 * For each probe event, if we find that a probe event matches
2157 * our enabler, create an associated lttng_event if not
2158 * already present.
2159 */
2160 list_for_each_entry(probe_desc, probe_list, head) {
2161 for (i = 0; i < probe_desc->nr_events; i++) {
2162 int found = 0;
2163 struct hlist_head *head;
2164 struct lttng_kernel_event_common *event;
2165 struct lttng_kernel_event_common_private *event_priv;
2166
2167 desc = probe_desc->event_desc[i];
2168 if (!lttng_desc_match_enabler(desc,
2169 lttng_event_recorder_enabler_as_enabler(event_enabler)))
2170 continue;
2171
2172 /*
2173 * Check if already created.
2174 */
2175 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
2176 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
2177 if (lttng_event_enabler_desc_match_event(&event_enabler->parent, desc, event_priv->pub))
2178 found = 1;
2179 }
2180 if (found)
2181 continue;
2182
2183 /*
2184 * We need to create an event for this event probe.
2185 */
2186 event = _lttng_kernel_event_create(&event_enabler->parent, desc);
2187 if (!event) {
2188 printk(KERN_INFO "LTTng: Unable to create event %s\n",
2189 probe_desc->event_desc[i]->event_name);
2190 }
2191 }
2192 }
2193 }
2194
2195 static
2196 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2197 {
2198 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent);
2199 struct lttng_kernel_probe_desc *probe_desc;
2200 const struct lttng_kernel_event_desc *desc;
2201 int i;
2202 struct list_head *probe_list;
2203
2204 probe_list = lttng_get_probe_list_head();
2205 /*
2206 * For each probe event, if we find that a probe event matches
2207 * our enabler, create an associated lttng_event_notifier if not
2208 * already present.
2209 */
2210 list_for_each_entry(probe_desc, probe_list, head) {
2211 for (i = 0; i < probe_desc->nr_events; i++) {
2212 int found = 0;
2213 struct hlist_head *head;
2214 struct lttng_kernel_event_common *event;
2215 struct lttng_kernel_event_common_private *event_priv;
2216
2217 desc = probe_desc->event_desc[i];
2218 if (!lttng_desc_match_enabler(desc,
2219 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2220 continue;
2221
2222 /*
2223 * Check if already created.
2224 */
2225 head = utils_borrow_hash_table_bucket(events_ht->table,
2226 LTTNG_EVENT_HT_SIZE, desc->event_name);
2227 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
2228 if (lttng_event_enabler_desc_match_event(&event_notifier_enabler->parent, desc, event_priv->pub))
2229 found = 1;
2230 }
2231 if (found)
2232 continue;
2233
2234 /*
2235 * We need to create a event_notifier for this event probe.
2236 */
2237 event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc);
2238 if (IS_ERR(event)) {
2239 printk(KERN_INFO "Unable to create event_notifier %s\n",
2240 probe_desc->event_desc[i]->event_name);
2241 }
2242 }
2243 }
2244 }
2245
2246 static
2247 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
2248 {
2249 int ret;
2250
2251 ret = lttng_syscalls_register_event(event_enabler);
2252 WARN_ON_ONCE(ret);
2253 }
2254
2255 /*
2256 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2257 * tracepoint probes.
2258 * Should be called with sessions mutex held.
2259 */
2260 static
2261 void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
2262 {
2263 switch (event_enabler->parent.event_param.instrumentation) {
2264 case LTTNG_KERNEL_ABI_TRACEPOINT:
2265 lttng_create_tracepoint_event_if_missing(event_enabler);
2266 break;
2267
2268 case LTTNG_KERNEL_ABI_SYSCALL:
2269 lttng_create_syscall_event_if_missing(&event_enabler->parent);
2270 break;
2271
2272 default:
2273 WARN_ON_ONCE(1);
2274 break;
2275 }
2276 }
2277
2278 /*
2279 * Create events associated with an event_enabler (if not already present),
2280 * and add backward reference from the event to the enabler.
2281 * Should be called with sessions mutex held.
2282 */
2283 static
2284 int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
2285 {
2286 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2287 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
2288 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
2289 struct lttng_kernel_event_recorder_private *event_recorder_priv;
2290
2291 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2292 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2293 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
2294 !strcmp(base_enabler->event_param.name, "*")) {
2295 int enabled = base_enabler->enabled;
2296 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2297
2298 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2299 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
2300
2301 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2302 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
2303 }
2304
2305 /* First ensure that probe events are created for this enabler. */
2306 lttng_create_event_if_missing(event_enabler);
2307
2308 /* For each event matching event_enabler in session event list. */
2309 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
2310 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
2311 struct lttng_enabler_ref *enabler_ref;
2312
2313 if (!lttng_event_enabler_match_event(&event_enabler->parent, &event_recorder->parent))
2314 continue;
2315 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
2316 lttng_event_recorder_enabler_as_enabler(event_enabler));
2317 if (!enabler_ref) {
2318 /*
2319 * If no backward ref, create it.
2320 * Add backward ref from event to event_enabler.
2321 */
2322 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2323 if (!enabler_ref)
2324 return -ENOMEM;
2325 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
2326 list_add(&enabler_ref->node,
2327 &event_recorder_priv->parent.enablers_ref_head);
2328 }
2329
2330 /*
2331 * Link filter bytecodes if not linked yet.
2332 */
2333 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2334 lttng_static_ctx,
2335 &event_recorder_priv->parent.filter_bytecode_runtime_head,
2336 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
2337 }
2338 return 0;
2339 }
2340
2341 /*
2342 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2343 * tracepoint probes.
2344 * Should be called with sessions mutex held.
2345 */
2346 static
2347 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2348 {
2349 switch (event_notifier_enabler->parent.event_param.instrumentation) {
2350 case LTTNG_KERNEL_ABI_TRACEPOINT:
2351 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2352 break;
2353
2354 case LTTNG_KERNEL_ABI_SYSCALL:
2355 lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent);
2356 break;
2357
2358 default:
2359 WARN_ON_ONCE(1);
2360 break;
2361 }
2362 }
2363
2364 /*
2365 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2366 */
2367 static
2368 int lttng_event_notifier_enabler_ref_event_notifiers(
2369 struct lttng_event_notifier_enabler *event_notifier_enabler)
2370 {
2371 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2372 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2373 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2374
2375 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2376 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2377 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
2378 !strcmp(base_enabler->event_param.name, "*")) {
2379
2380 int enabled = base_enabler->enabled;
2381 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2382
2383 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2384 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
2385
2386 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2387 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
2388
2389 }
2390
2391 /* First ensure that probe event_notifiers are created for this enabler. */
2392 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2393
2394 /* Link the created event_notifier with its associated enabler. */
2395 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2396 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
2397 struct lttng_enabler_ref *enabler_ref;
2398
2399 if (!lttng_event_enabler_match_event(&event_notifier_enabler->parent, &event_notifier->parent))
2400 continue;
2401
2402 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
2403 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2404 if (!enabler_ref) {
2405 /*
2406 * If no backward ref, create it.
2407 * Add backward ref from event_notifier to enabler.
2408 */
2409 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2410 if (!enabler_ref)
2411 return -ENOMEM;
2412
2413 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2414 event_notifier_enabler);
2415 list_add(&enabler_ref->node,
2416 &event_notifier_priv->parent.enablers_ref_head);
2417 }
2418
2419 /*
2420 * Link filter bytecodes if not linked yet.
2421 */
2422 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2423 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
2424 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
2425
2426 /* Link capture bytecodes if not linked yet. */
2427 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2428 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
2429 &event_notifier_enabler->capture_bytecode_head);
2430
2431 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
2432 }
2433 return 0;
2434 }
2435
2436 /*
2437 * Called at module load: connect the probe on all enablers matching
2438 * this event.
2439 * Called with sessions lock held.
2440 */
2441 int lttng_fix_pending_events(void)
2442 {
2443 struct lttng_kernel_session_private *session_priv;
2444
2445 list_for_each_entry(session_priv, &sessions, list)
2446 lttng_session_lazy_sync_event_enablers(session_priv->pub);
2447 return 0;
2448 }
2449
2450 static bool lttng_event_notifier_group_has_active_event_notifiers(
2451 struct lttng_event_notifier_group *event_notifier_group)
2452 {
2453 struct lttng_event_notifier_enabler *event_notifier_enabler;
2454
2455 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2456 node) {
2457 if (event_notifier_enabler->parent.enabled)
2458 return true;
2459 }
2460 return false;
2461 }
2462
2463 bool lttng_event_notifier_active(void)
2464 {
2465 struct lttng_event_notifier_group *event_notifier_group;
2466
2467 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2468 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2469 return true;
2470 }
2471 return false;
2472 }
2473
2474 int lttng_fix_pending_event_notifiers(void)
2475 {
2476 struct lttng_event_notifier_group *event_notifier_group;
2477
2478 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2479 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2480 return 0;
2481 }
2482
2483 struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
2484 enum lttng_enabler_format_type format_type,
2485 struct lttng_kernel_abi_event *event_param,
2486 struct lttng_kernel_channel_buffer *chan)
2487 {
2488 struct lttng_event_recorder_enabler *event_enabler;
2489
2490 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2491 if (!event_enabler)
2492 return NULL;
2493 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
2494 event_enabler->parent.format_type = format_type;
2495 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2496 memcpy(&event_enabler->parent.event_param, event_param,
2497 sizeof(event_enabler->parent.event_param));
2498 event_enabler->chan = chan;
2499 /* ctx left NULL */
2500 event_enabler->parent.enabled = 0;
2501 return event_enabler;
2502 }
2503
2504 void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
2505 struct lttng_event_recorder_enabler *event_enabler)
2506 {
2507 mutex_lock(&sessions_mutex);
2508 list_add(&event_enabler->node, &session->priv->enablers_head);
2509 event_enabler->published = true;
2510 lttng_session_lazy_sync_event_enablers(session);
2511 mutex_unlock(&sessions_mutex);
2512 }
2513
2514 int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
2515 {
2516 mutex_lock(&sessions_mutex);
2517 event_enabler->enabled = 1;
2518 lttng_event_enabler_sync(event_enabler);
2519 mutex_unlock(&sessions_mutex);
2520 return 0;
2521 }
2522
2523 int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
2524 {
2525 mutex_lock(&sessions_mutex);
2526 event_enabler->enabled = 0;
2527 lttng_event_enabler_sync(event_enabler);
2528 mutex_unlock(&sessions_mutex);
2529 return 0;
2530 }
2531
2532 static
2533 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
2534 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
2535 {
2536 struct lttng_kernel_bytecode_node *bytecode_node;
2537 uint32_t bytecode_len;
2538 int ret;
2539
2540 ret = get_user(bytecode_len, &bytecode->len);
2541 if (ret)
2542 return ret;
2543 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2544 GFP_KERNEL);
2545 if (!bytecode_node)
2546 return -ENOMEM;
2547 ret = copy_from_user(&bytecode_node->bc, bytecode,
2548 sizeof(*bytecode) + bytecode_len);
2549 if (ret)
2550 goto error_free;
2551
2552 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
2553 bytecode_node->enabler = enabler;
2554 /* Enforce length based on allocated size */
2555 bytecode_node->bc.len = bytecode_len;
2556 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
2557
2558 return 0;
2559
2560 error_free:
2561 lttng_kvfree(bytecode_node);
2562 return ret;
2563 }
2564
2565 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
2566 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
2567 {
2568 int ret;
2569 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
2570 if (ret)
2571 goto error;
2572 lttng_event_enabler_sync(event_enabler);
2573 return 0;
2574
2575 error:
2576 return ret;
2577 }
2578
2579 int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
2580 struct lttng_kernel_abi_event_callsite __user *callsite)
2581 {
2582
2583 switch (event->priv->instrumentation) {
2584 case LTTNG_KERNEL_ABI_UPROBE:
2585 return lttng_uprobes_event_add_callsite(event, callsite);
2586 default:
2587 return -EINVAL;
2588 }
2589 }
2590
2591 static
2592 void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
2593 {
2594 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
2595
2596 /* Destroy filter bytecode */
2597 list_for_each_entry_safe(filter_node, tmp_filter_node,
2598 &enabler->filter_bytecode_head, node) {
2599 lttng_kvfree(filter_node);
2600 }
2601 }
2602
2603 void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
2604 {
2605 switch (event_enabler->enabler_type) {
2606 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2607 {
2608 struct lttng_event_recorder_enabler *event_recorder_enabler =
2609 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2610
2611 lttng_enabler_destroy(event_enabler);
2612 if (event_recorder_enabler->published)
2613 list_del(&event_recorder_enabler->node);
2614 kfree(event_recorder_enabler);
2615 break;
2616 }
2617 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2618 {
2619 struct lttng_event_notifier_enabler *event_notifier_enabler =
2620 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2621
2622 lttng_enabler_destroy(event_enabler);
2623 if (event_notifier_enabler->published)
2624 list_del(&event_notifier_enabler->node);
2625 kfree(event_notifier_enabler);
2626 break;
2627 }
2628 default:
2629 WARN_ON_ONCE(1);
2630 }
2631 }
2632
2633 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2634 enum lttng_enabler_format_type format_type,
2635 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2636 struct lttng_event_notifier_group *event_notifier_group)
2637 {
2638 struct lttng_event_notifier_enabler *event_notifier_enabler;
2639
2640 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2641 if (!event_notifier_enabler)
2642 return NULL;
2643
2644 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
2645 event_notifier_enabler->parent.format_type = format_type;
2646 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
2647 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2648
2649 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
2650 event_notifier_enabler->num_captures = 0;
2651
2652 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2653 sizeof(event_notifier_enabler->parent.event_param));
2654
2655 event_notifier_enabler->parent.enabled = 0;
2656 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
2657 event_notifier_enabler->group = event_notifier_group;
2658 return event_notifier_enabler;
2659 }
2660
2661 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2662 struct lttng_event_notifier_enabler *event_notifier_enabler)
2663 {
2664 mutex_lock(&sessions_mutex);
2665 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
2666 event_notifier_enabler->published = true;
2667 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2668 mutex_unlock(&sessions_mutex);
2669 }
2670
2671 int lttng_event_notifier_enabler_enable(
2672 struct lttng_event_notifier_enabler *event_notifier_enabler)
2673 {
2674 mutex_lock(&sessions_mutex);
2675 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
2676 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2677 mutex_unlock(&sessions_mutex);
2678 return 0;
2679 }
2680
2681 int lttng_event_notifier_enabler_disable(
2682 struct lttng_event_notifier_enabler *event_notifier_enabler)
2683 {
2684 mutex_lock(&sessions_mutex);
2685 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
2686 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2687 mutex_unlock(&sessions_mutex);
2688 return 0;
2689 }
2690
2691 int lttng_event_notifier_enabler_attach_capture_bytecode(
2692 struct lttng_event_notifier_enabler *event_notifier_enabler,
2693 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
2694 {
2695 struct lttng_kernel_bytecode_node *bytecode_node;
2696 struct lttng_event_enabler_common *enabler =
2697 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2698 uint32_t bytecode_len;
2699 int ret;
2700
2701 ret = get_user(bytecode_len, &bytecode->len);
2702 if (ret)
2703 return ret;
2704
2705 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2706 GFP_KERNEL);
2707 if (!bytecode_node)
2708 return -ENOMEM;
2709
2710 ret = copy_from_user(&bytecode_node->bc, bytecode,
2711 sizeof(*bytecode) + bytecode_len);
2712 if (ret)
2713 goto error_free;
2714
2715 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
2716 bytecode_node->enabler = enabler;
2717
2718 /* Enforce length based on allocated size */
2719 bytecode_node->bc.len = bytecode_len;
2720 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2721
2722 event_notifier_enabler->num_captures++;
2723
2724 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2725 goto end;
2726
2727 error_free:
2728 lttng_kvfree(bytecode_node);
2729 end:
2730 return ret;
2731 }
2732
2733 /*
2734 * lttng_session_sync_event_enablers should be called just before starting a
2735 * session.
2736 * Should be called with sessions mutex held.
2737 */
2738 static
2739 void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2740 {
2741 struct lttng_event_recorder_enabler *event_enabler;
2742 struct lttng_kernel_event_recorder_private *event_recorder_priv;
2743
2744 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
2745 lttng_event_enabler_ref_events(event_enabler);
2746 /*
2747 * For each event, if at least one of its enablers is enabled,
2748 * and its channel and session transient states are enabled, we
2749 * enable the event, else we disable it.
2750 */
2751 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
2752 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
2753 struct lttng_enabler_ref *enabler_ref;
2754 struct lttng_kernel_bytecode_runtime *runtime;
2755 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2756 int nr_filters = 0;
2757
2758 switch (event_recorder_priv->parent.instrumentation) {
2759 case LTTNG_KERNEL_ABI_TRACEPOINT:
2760 lttng_fallthrough;
2761 case LTTNG_KERNEL_ABI_SYSCALL:
2762 /* Enable events */
2763 list_for_each_entry(enabler_ref,
2764 &event_recorder_priv->parent.enablers_ref_head, node) {
2765 if (enabler_ref->ref->enabled) {
2766 enabled = 1;
2767 break;
2768 }
2769 }
2770 break;
2771
2772 default:
2773 /* Not handled with lazy sync. */
2774 continue;
2775 }
2776 /*
2777 * Enabled state is based on union of enablers, with
2778 * intesection of session and channel transient enable
2779 * states.
2780 */
2781 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2782
2783 WRITE_ONCE(event_recorder->parent.enabled, enabled);
2784 /*
2785 * Sync tracepoint registration with event enabled
2786 * state.
2787 */
2788 if (enabled) {
2789 register_event(&event_recorder->parent);
2790 } else {
2791 _lttng_event_unregister(&event_recorder->parent);
2792 }
2793
2794 /* Check if has enablers without bytecode enabled */
2795 list_for_each_entry(enabler_ref,
2796 &event_recorder_priv->parent.enablers_ref_head, node) {
2797 if (enabler_ref->ref->enabled
2798 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2799 has_enablers_without_filter_bytecode = 1;
2800 break;
2801 }
2802 }
2803 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
2804 has_enablers_without_filter_bytecode;
2805
2806 /* Enable filters */
2807 list_for_each_entry(runtime,
2808 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
2809 lttng_bytecode_sync_state(runtime);
2810 nr_filters++;
2811 }
2812 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2813 !(has_enablers_without_filter_bytecode || !nr_filters));
2814 }
2815 }
2816
2817 /*
2818 * Apply enablers to session events, adding events to session if need
2819 * be. It is required after each modification applied to an active
2820 * session, and right before session "start".
2821 * "lazy" sync means we only sync if required.
2822 * Should be called with sessions mutex held.
2823 */
2824 static
2825 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
2826 {
2827 /* We can skip if session is not active */
2828 if (!session->active)
2829 return;
2830 lttng_session_sync_event_enablers(session);
2831 }
2832
2833 static
2834 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2835 {
2836 struct lttng_event_notifier_enabler *event_notifier_enabler;
2837 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2838
2839 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2840 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2841
2842 /*
2843 * For each event_notifier, if at least one of its enablers is enabled,
2844 * we enable the event_notifier, else we disable it.
2845 */
2846 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2847 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
2848 struct lttng_enabler_ref *enabler_ref;
2849 struct lttng_kernel_bytecode_runtime *runtime;
2850 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2851 int nr_filters = 0, nr_captures = 0;
2852
2853 switch (event_notifier_priv->parent.instrumentation) {
2854 case LTTNG_KERNEL_ABI_TRACEPOINT:
2855 lttng_fallthrough;
2856 case LTTNG_KERNEL_ABI_SYSCALL:
2857 /* Enable event_notifiers */
2858 list_for_each_entry(enabler_ref,
2859 &event_notifier_priv->parent.enablers_ref_head, node) {
2860 if (enabler_ref->ref->enabled) {
2861 enabled = 1;
2862 break;
2863 }
2864 }
2865 break;
2866
2867 default:
2868 /* Not handled with sync. */
2869 continue;
2870 }
2871
2872 WRITE_ONCE(event_notifier->parent.enabled, enabled);
2873 /*
2874 * Sync tracepoint registration with event_notifier enabled
2875 * state.
2876 */
2877 if (enabled) {
2878 if (!event_notifier_priv->parent.registered)
2879 register_event(&event_notifier->parent);
2880 } else {
2881 if (event_notifier_priv->parent.registered)
2882 _lttng_event_unregister(&event_notifier->parent);
2883 }
2884
2885 /* Check if has enablers without bytecode enabled */
2886 list_for_each_entry(enabler_ref,
2887 &event_notifier_priv->parent.enablers_ref_head, node) {
2888 if (enabler_ref->ref->enabled
2889 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2890 has_enablers_without_filter_bytecode = 1;
2891 break;
2892 }
2893 }
2894 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
2895 has_enablers_without_filter_bytecode;
2896
2897 /* Enable filters */
2898 list_for_each_entry(runtime,
2899 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
2900 lttng_bytecode_sync_state(runtime);
2901 nr_filters++;
2902 }
2903 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2904 !(has_enablers_without_filter_bytecode || !nr_filters));
2905
2906 /* Enable captures */
2907 list_for_each_entry(runtime,
2908 &event_notifier_priv->capture_bytecode_runtime_head, node) {
2909 lttng_bytecode_sync_state(runtime);
2910 nr_captures++;
2911 }
2912 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2913 }
2914 }
2915
2916 static
2917 void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2918 {
2919 switch (event_enabler->enabler_type) {
2920 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2921 {
2922 struct lttng_event_recorder_enabler *event_recorder_enabler =
2923 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2924 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2925 break;
2926 }
2927 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2928 {
2929 struct lttng_event_notifier_enabler *event_notifier_enabler =
2930 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2931 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2932 break;
2933 }
2934 default:
2935 WARN_ON_ONCE(1);
2936 }
2937 }
2938
2939 /*
2940 * Serialize at most one packet worth of metadata into a metadata
2941 * channel.
2942 * We grab the metadata cache mutex to get exclusive access to our metadata
2943 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2944 * allows us to do racy operations such as looking for remaining space left in
2945 * packet and write, since mutual exclusion protects us from concurrent writes.
2946 * Mutual exclusion on the metadata cache allow us to read the cache content
2947 * without racing against reallocation of the cache by updates.
2948 * Returns the number of bytes written in the channel, 0 if no data
2949 * was written and a negative value on error.
2950 */
2951 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
2952 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
2953 {
2954 struct lttng_kernel_ring_buffer_ctx ctx;
2955 int ret = 0;
2956 size_t len, reserve_len;
2957
2958 /*
2959 * Ensure we support mutiple get_next / put sequences followed by
2960 * put_next. The metadata cache lock protects reading the metadata
2961 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2962 * "flush" operations on the buffer invoked by different processes.
2963 * Moreover, since the metadata cache memory can be reallocated, we
2964 * need to have exclusive access against updates even though we only
2965 * read it.
2966 */
2967 mutex_lock(&stream->metadata_cache->lock);
2968 WARN_ON(stream->metadata_in < stream->metadata_out);
2969 if (stream->metadata_in != stream->metadata_out)
2970 goto end;
2971
2972 /* Metadata regenerated, change the version. */
2973 if (stream->metadata_cache->version != stream->version)
2974 stream->version = stream->metadata_cache->version;
2975
2976 len = stream->metadata_cache->metadata_written -
2977 stream->metadata_in;
2978 if (!len)
2979 goto end;
2980 reserve_len = min_t(size_t,
2981 stream->transport->ops.priv->packet_avail_size(chan),
2982 len);
2983 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
2984 sizeof(char), NULL);
2985 /*
2986 * If reservation failed, return an error to the caller.
2987 */
2988 ret = stream->transport->ops.event_reserve(&ctx);
2989 if (ret != 0) {
2990 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
2991 stream->coherent = false;
2992 goto end;
2993 }
2994 stream->transport->ops.event_write(&ctx,
2995 stream->metadata_cache->data + stream->metadata_in,
2996 reserve_len, 1);
2997 stream->transport->ops.event_commit(&ctx);
2998 stream->metadata_in += reserve_len;
2999 if (reserve_len < len)
3000 stream->coherent = false;
3001 else
3002 stream->coherent = true;
3003 ret = reserve_len;
3004
3005 end:
3006 if (coherent)
3007 *coherent = stream->coherent;
3008 mutex_unlock(&stream->metadata_cache->lock);
3009 return ret;
3010 }
3011
3012 static
3013 void lttng_metadata_begin(struct lttng_kernel_session *session)
3014 {
3015 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
3016 mutex_lock(&session->priv->metadata_cache->lock);
3017 }
3018
3019 static
3020 void lttng_metadata_end(struct lttng_kernel_session *session)
3021 {
3022 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3023 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3024 struct lttng_metadata_stream *stream;
3025
3026 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3027 wake_up_interruptible(&stream->read_wait);
3028 mutex_unlock(&session->priv->metadata_cache->lock);
3029 }
3030 }
3031
3032 /*
3033 * Write the metadata to the metadata cache.
3034 * Must be called with sessions_mutex held.
3035 * The metadata cache lock protects us from concurrent read access from
3036 * thread outputting metadata content to ring buffer.
3037 * The content of the printf is printed as a single atomic metadata
3038 * transaction.
3039 */
3040 int lttng_metadata_printf(struct lttng_kernel_session *session,
3041 const char *fmt, ...)
3042 {
3043 char *str;
3044 size_t len;
3045 va_list ap;
3046
3047 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
3048
3049 va_start(ap, fmt);
3050 str = kvasprintf(GFP_KERNEL, fmt, ap);
3051 va_end(ap);
3052 if (!str)
3053 return -ENOMEM;
3054
3055 len = strlen(str);
3056 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3057 if (session->priv->metadata_cache->metadata_written + len >
3058 session->priv->metadata_cache->cache_alloc) {
3059 char *tmp_cache_realloc;
3060 unsigned int tmp_cache_alloc_size;
3061
3062 tmp_cache_alloc_size = max_t(unsigned int,
3063 session->priv->metadata_cache->cache_alloc + len,
3064 session->priv->metadata_cache->cache_alloc << 1);
3065 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
3066 if (!tmp_cache_realloc)
3067 goto err;
3068 if (session->priv->metadata_cache->data) {
3069 memcpy(tmp_cache_realloc,
3070 session->priv->metadata_cache->data,
3071 session->priv->metadata_cache->cache_alloc);
3072 vfree(session->priv->metadata_cache->data);
3073 }
3074
3075 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3076 session->priv->metadata_cache->data = tmp_cache_realloc;
3077 }
3078 memcpy(session->priv->metadata_cache->data +
3079 session->priv->metadata_cache->metadata_written,
3080 str, len);
3081 session->priv->metadata_cache->metadata_written += len;
3082 kfree(str);
3083
3084 return 0;
3085
3086 err:
3087 kfree(str);
3088 return -ENOMEM;
3089 }
3090
3091 static
3092 int print_tabs(struct lttng_kernel_session *session, size_t nesting)
3093 {
3094 size_t i;
3095
3096 for (i = 0; i < nesting; i++) {
3097 int ret;
3098
3099 ret = lttng_metadata_printf(session, " ");
3100 if (ret) {
3101 return ret;
3102 }
3103 }
3104 return 0;
3105 }
3106
3107 static
3108 int lttng_field_name_statedump(struct lttng_kernel_session *session,
3109 const struct lttng_kernel_event_field *field,
3110 size_t nesting)
3111 {
3112 return lttng_metadata_printf(session, " _%s;\n", field->name);
3113 }
3114
3115 static
3116 int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
3117 const struct lttng_kernel_type_integer *type,
3118 enum lttng_kernel_string_encoding parent_encoding,
3119 size_t nesting)
3120 {
3121 int ret;
3122
3123 ret = print_tabs(session, nesting);
3124 if (ret)
3125 return ret;
3126 ret = lttng_metadata_printf(session,
3127 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3128 type->size,
3129 type->alignment,
3130 type->signedness,
3131 (parent_encoding == lttng_kernel_string_encoding_none)
3132 ? "none"
3133 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
3134 ? "UTF8"
3135 : "ASCII",
3136 type->base,
3137 #if __BYTE_ORDER == __BIG_ENDIAN
3138 type->reverse_byte_order ? " byte_order = le;" : ""
3139 #else
3140 type->reverse_byte_order ? " byte_order = be;" : ""
3141 #endif
3142 );
3143 return ret;
3144 }
3145
3146 /*
3147 * Must be called with sessions_mutex held.
3148 */
3149 static
3150 int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
3151 const struct lttng_kernel_type_struct *type,
3152 size_t nesting)
3153 {
3154 const char *prev_field_name = NULL;
3155 int ret;
3156 uint32_t i, nr_fields;
3157 unsigned int alignment;
3158
3159 ret = print_tabs(session, nesting);
3160 if (ret)
3161 return ret;
3162 ret = lttng_metadata_printf(session,
3163 "struct {\n");
3164 if (ret)
3165 return ret;
3166 nr_fields = type->nr_fields;
3167 for (i = 0; i < nr_fields; i++) {
3168 const struct lttng_kernel_event_field *iter_field;
3169
3170 iter_field = type->fields[i];
3171 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
3172 if (ret)
3173 return ret;
3174 }
3175 ret = print_tabs(session, nesting);
3176 if (ret)
3177 return ret;
3178 alignment = type->alignment;
3179 if (alignment) {
3180 ret = lttng_metadata_printf(session,
3181 "} align(%u)",
3182 alignment);
3183 } else {
3184 ret = lttng_metadata_printf(session,
3185 "}");
3186 }
3187 return ret;
3188 }
3189
3190 /*
3191 * Must be called with sessions_mutex held.
3192 */
3193 static
3194 int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
3195 const struct lttng_kernel_event_field *field,
3196 size_t nesting)
3197 {
3198 int ret;
3199
3200 ret = _lttng_struct_type_statedump(session,
3201 lttng_kernel_get_type_struct(field->type), nesting);
3202 if (ret)
3203 return ret;
3204 return lttng_field_name_statedump(session, field, nesting);
3205 }
3206
3207 /*
3208 * Must be called with sessions_mutex held.
3209 */
3210 static
3211 int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
3212 const struct lttng_kernel_type_variant *type,
3213 size_t nesting,
3214 const char *prev_field_name)
3215 {
3216 const char *tag_name;
3217 int ret;
3218 uint32_t i, nr_choices;
3219
3220 tag_name = type->tag_name;
3221 if (!tag_name)
3222 tag_name = prev_field_name;
3223 if (!tag_name)
3224 return -EINVAL;
3225 /*
3226 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3227 */
3228 if (type->alignment != 0)
3229 return -EINVAL;
3230 ret = print_tabs(session, nesting);
3231 if (ret)
3232 return ret;
3233 ret = lttng_metadata_printf(session,
3234 "variant <_%s> {\n",
3235 tag_name);
3236 if (ret)
3237 return ret;
3238 nr_choices = type->nr_choices;
3239 for (i = 0; i < nr_choices; i++) {
3240 const struct lttng_kernel_event_field *iter_field;
3241
3242 iter_field = type->choices[i];
3243 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
3244 if (ret)
3245 return ret;
3246 }
3247 ret = print_tabs(session, nesting);
3248 if (ret)
3249 return ret;
3250 ret = lttng_metadata_printf(session,
3251 "}");
3252 return ret;
3253 }
3254
3255 /*
3256 * Must be called with sessions_mutex held.
3257 */
3258 static
3259 int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
3260 const struct lttng_kernel_event_field *field,
3261 size_t nesting,
3262 const char *prev_field_name)
3263 {
3264 int ret;
3265
3266 ret = _lttng_variant_type_statedump(session,
3267 lttng_kernel_get_type_variant(field->type), nesting,
3268 prev_field_name);
3269 if (ret)
3270 return ret;
3271 return lttng_field_name_statedump(session, field, nesting);
3272 }
3273
3274 /*
3275 * Must be called with sessions_mutex held.
3276 */
3277 static
3278 int _lttng_array_field_statedump(struct lttng_kernel_session *session,
3279 const struct lttng_kernel_event_field *field,
3280 size_t nesting)
3281 {
3282 int ret;
3283 const struct lttng_kernel_type_array *array_type;
3284 const struct lttng_kernel_type_common *elem_type;
3285
3286 array_type = lttng_kernel_get_type_array(field->type);
3287 WARN_ON_ONCE(!array_type);
3288
3289 if (array_type->alignment) {
3290 ret = print_tabs(session, nesting);
3291 if (ret)
3292 return ret;
3293 ret = lttng_metadata_printf(session,
3294 "struct { } align(%u) _%s_padding;\n",
3295 array_type->alignment * CHAR_BIT,
3296 field->name);
3297 if (ret)
3298 return ret;
3299 }
3300 /*
3301 * Nested compound types: Only array of structures and variants are
3302 * currently supported.
3303 */
3304 elem_type = array_type->elem_type;
3305 switch (elem_type->type) {
3306 case lttng_kernel_type_integer:
3307 case lttng_kernel_type_struct:
3308 case lttng_kernel_type_variant:
3309 ret = _lttng_type_statedump(session, elem_type,
3310 array_type->encoding, nesting);
3311 if (ret)
3312 return ret;
3313 break;
3314
3315 default:
3316 return -EINVAL;
3317 }
3318 ret = lttng_metadata_printf(session,
3319 " _%s[%u];\n",
3320 field->name,
3321 array_type->length);
3322 return ret;
3323 }
3324
3325 /*
3326 * Must be called with sessions_mutex held.
3327 */
3328 static
3329 int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
3330 const struct lttng_kernel_event_field *field,
3331 size_t nesting,
3332 const char *prev_field_name)
3333 {
3334 int ret;
3335 const char *length_name;
3336 const struct lttng_kernel_type_sequence *sequence_type;
3337 const struct lttng_kernel_type_common *elem_type;
3338
3339 sequence_type = lttng_kernel_get_type_sequence(field->type);
3340 WARN_ON_ONCE(!sequence_type);
3341
3342 length_name = sequence_type->length_name;
3343 if (!length_name)
3344 length_name = prev_field_name;
3345 if (!length_name)
3346 return -EINVAL;
3347
3348 if (sequence_type->alignment) {
3349 ret = print_tabs(session, nesting);
3350 if (ret)
3351 return ret;
3352 ret = lttng_metadata_printf(session,
3353 "struct { } align(%u) _%s_padding;\n",
3354 sequence_type->alignment * CHAR_BIT,
3355 field->name);
3356 if (ret)
3357 return ret;
3358 }
3359
3360 /*
3361 * Nested compound types: Only array of structures and variants are
3362 * currently supported.
3363 */
3364 elem_type = sequence_type->elem_type;
3365 switch (elem_type->type) {
3366 case lttng_kernel_type_integer:
3367 case lttng_kernel_type_struct:
3368 case lttng_kernel_type_variant:
3369 ret = _lttng_type_statedump(session, elem_type,
3370 sequence_type->encoding, nesting);
3371 if (ret)
3372 return ret;
3373 break;
3374
3375 default:
3376 return -EINVAL;
3377 }
3378 ret = lttng_metadata_printf(session,
3379 " _%s[ _%s ];\n",
3380 field->name,
3381 length_name);
3382 return ret;
3383 }
3384
3385 /*
3386 * Must be called with sessions_mutex held.
3387 */
3388 static
3389 int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
3390 const struct lttng_kernel_type_enum *type,
3391 size_t nesting)
3392 {
3393 const struct lttng_kernel_enum_desc *enum_desc;
3394 const struct lttng_kernel_type_common *container_type;
3395 int ret;
3396 unsigned int i, nr_entries;
3397
3398 container_type = type->container_type;
3399 if (container_type->type != lttng_kernel_type_integer) {
3400 ret = -EINVAL;
3401 goto end;
3402 }
3403 enum_desc = type->desc;
3404 nr_entries = enum_desc->nr_entries;
3405
3406 ret = print_tabs(session, nesting);
3407 if (ret)
3408 goto end;
3409 ret = lttng_metadata_printf(session, "enum : ");
3410 if (ret)
3411 goto end;
3412 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3413 lttng_kernel_string_encoding_none, 0);
3414 if (ret)
3415 goto end;
3416 ret = lttng_metadata_printf(session, " {\n");
3417 if (ret)
3418 goto end;
3419 /* Dump all entries */
3420 for (i = 0; i < nr_entries; i++) {
3421 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
3422 int j, len;
3423
3424 ret = print_tabs(session, nesting + 1);
3425 if (ret)
3426 goto end;
3427 ret = lttng_metadata_printf(session,
3428 "\"");
3429 if (ret)
3430 goto end;
3431 len = strlen(entry->string);
3432 /* Escape the character '"' */
3433 for (j = 0; j < len; j++) {
3434 char c = entry->string[j];
3435
3436 switch (c) {
3437 case '"':
3438 ret = lttng_metadata_printf(session,
3439 "\\\"");
3440 break;
3441 case '\\':
3442 ret = lttng_metadata_printf(session,
3443 "\\\\");
3444 break;
3445 default:
3446 ret = lttng_metadata_printf(session,
3447 "%c", c);
3448 break;
3449 }
3450 if (ret)
3451 goto end;
3452 }
3453 ret = lttng_metadata_printf(session, "\"");
3454 if (ret)
3455 goto end;
3456
3457 if (entry->options.is_auto) {
3458 ret = lttng_metadata_printf(session, ",\n");
3459 if (ret)
3460 goto end;
3461 } else {
3462 ret = lttng_metadata_printf(session,
3463 " = ");
3464 if (ret)
3465 goto end;
3466 if (entry->start.signedness)
3467 ret = lttng_metadata_printf(session,
3468 "%lld", (long long) entry->start.value);
3469 else
3470 ret = lttng_metadata_printf(session,
3471 "%llu", entry->start.value);
3472 if (ret)
3473 goto end;
3474 if (entry->start.signedness == entry->end.signedness &&
3475 entry->start.value
3476 == entry->end.value) {
3477 ret = lttng_metadata_printf(session,
3478 ",\n");
3479 } else {
3480 if (entry->end.signedness) {
3481 ret = lttng_metadata_printf(session,
3482 " ... %lld,\n",
3483 (long long) entry->end.value);
3484 } else {
3485 ret = lttng_metadata_printf(session,
3486 " ... %llu,\n",
3487 entry->end.value);
3488 }
3489 }
3490 if (ret)
3491 goto end;
3492 }
3493 }
3494 ret = print_tabs(session, nesting);
3495 if (ret)
3496 goto end;
3497 ret = lttng_metadata_printf(session, "}");
3498 end:
3499 return ret;
3500 }
3501
3502 /*
3503 * Must be called with sessions_mutex held.
3504 */
3505 static
3506 int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
3507 const struct lttng_kernel_event_field *field,
3508 size_t nesting)
3509 {
3510 int ret;
3511 const struct lttng_kernel_type_enum *enum_type;
3512
3513 enum_type = lttng_kernel_get_type_enum(field->type);
3514 WARN_ON_ONCE(!enum_type);
3515 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
3516 if (ret)
3517 return ret;
3518 return lttng_field_name_statedump(session, field, nesting);
3519 }
3520
3521 static
3522 int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
3523 const struct lttng_kernel_event_field *field,
3524 size_t nesting)
3525 {
3526 int ret;
3527
3528 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3529 lttng_kernel_string_encoding_none, nesting);
3530 if (ret)
3531 return ret;
3532 return lttng_field_name_statedump(session, field, nesting);
3533 }
3534
3535 static
3536 int _lttng_string_type_statedump(struct lttng_kernel_session *session,
3537 const struct lttng_kernel_type_string *type,
3538 size_t nesting)
3539 {
3540 int ret;
3541
3542 /* Default encoding is UTF8 */
3543 ret = print_tabs(session, nesting);
3544 if (ret)
3545 return ret;
3546 ret = lttng_metadata_printf(session,
3547 "string%s",
3548 type->encoding == lttng_kernel_string_encoding_ASCII ?
3549 " { encoding = ASCII; }" : "");
3550 return ret;
3551 }
3552
3553 static
3554 int _lttng_string_field_statedump(struct lttng_kernel_session *session,
3555 const struct lttng_kernel_event_field *field,
3556 size_t nesting)
3557 {
3558 const struct lttng_kernel_type_string *string_type;
3559 int ret;
3560
3561 string_type = lttng_kernel_get_type_string(field->type);
3562 WARN_ON_ONCE(!string_type);
3563 ret = _lttng_string_type_statedump(session, string_type, nesting);
3564 if (ret)
3565 return ret;
3566 return lttng_field_name_statedump(session, field, nesting);
3567 }
3568
3569 /*
3570 * Must be called with sessions_mutex held.
3571 */
3572 static
3573 int _lttng_type_statedump(struct lttng_kernel_session *session,
3574 const struct lttng_kernel_type_common *type,
3575 enum lttng_kernel_string_encoding parent_encoding,
3576 size_t nesting)
3577 {
3578 int ret = 0;
3579
3580 switch (type->type) {
3581 case lttng_kernel_type_integer:
3582 ret = _lttng_integer_type_statedump(session,
3583 lttng_kernel_get_type_integer(type),
3584 parent_encoding, nesting);
3585 break;
3586 case lttng_kernel_type_enum:
3587 ret = _lttng_enum_type_statedump(session,
3588 lttng_kernel_get_type_enum(type),
3589 nesting);
3590 break;
3591 case lttng_kernel_type_string:
3592 ret = _lttng_string_type_statedump(session,
3593 lttng_kernel_get_type_string(type),
3594 nesting);
3595 break;
3596 case lttng_kernel_type_struct:
3597 ret = _lttng_struct_type_statedump(session,
3598 lttng_kernel_get_type_struct(type),
3599 nesting);
3600 break;
3601 case lttng_kernel_type_variant:
3602 ret = _lttng_variant_type_statedump(session,
3603 lttng_kernel_get_type_variant(type),
3604 nesting, NULL);
3605 break;
3606
3607 /* Nested arrays and sequences are not supported yet. */
3608 case lttng_kernel_type_array:
3609 case lttng_kernel_type_sequence:
3610 default:
3611 WARN_ON_ONCE(1);
3612 return -EINVAL;
3613 }
3614 return ret;
3615 }
3616
3617 /*
3618 * Must be called with sessions_mutex held.
3619 */
3620 static
3621 int _lttng_field_statedump(struct lttng_kernel_session *session,
3622 const struct lttng_kernel_event_field *field,
3623 size_t nesting,
3624 const char **prev_field_name_p)
3625 {
3626 const char *prev_field_name = NULL;
3627 int ret = 0;
3628
3629 if (prev_field_name_p)
3630 prev_field_name = *prev_field_name_p;
3631 switch (field->type->type) {
3632 case lttng_kernel_type_integer:
3633 ret = _lttng_integer_field_statedump(session, field, nesting);
3634 break;
3635 case lttng_kernel_type_enum:
3636 ret = _lttng_enum_field_statedump(session, field, nesting);
3637 break;
3638 case lttng_kernel_type_string:
3639 ret = _lttng_string_field_statedump(session, field, nesting);
3640 break;
3641 case lttng_kernel_type_struct:
3642 ret = _lttng_struct_field_statedump(session, field, nesting);
3643 break;
3644 case lttng_kernel_type_array:
3645 ret = _lttng_array_field_statedump(session, field, nesting);
3646 break;
3647 case lttng_kernel_type_sequence:
3648 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
3649 break;
3650 case lttng_kernel_type_variant:
3651 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
3652 break;
3653
3654 default:
3655 WARN_ON_ONCE(1);
3656 return -EINVAL;
3657 }
3658 if (prev_field_name_p)
3659 *prev_field_name_p = field->name;
3660 return ret;
3661 }
3662
3663 static
3664 int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
3665 struct lttng_kernel_ctx *ctx)
3666 {
3667 const char *prev_field_name = NULL;
3668 int ret = 0;
3669 int i;
3670
3671 if (!ctx)
3672 return 0;
3673 for (i = 0; i < ctx->nr_fields; i++) {
3674 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
3675
3676 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
3677 if (ret)
3678 return ret;
3679 }
3680 return ret;
3681 }
3682
3683 static
3684 int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
3685 struct lttng_kernel_event_recorder *event_recorder)
3686 {
3687 const char *prev_field_name = NULL;
3688 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
3689 int ret = 0;
3690 int i;
3691
3692 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3693 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
3694
3695 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
3696 if (ret)
3697 return ret;
3698 }
3699 return ret;
3700 }
3701
3702 /*
3703 * Must be called with sessions_mutex held.
3704 * The entire event metadata is printed as a single atomic metadata
3705 * transaction.
3706 */
3707 static
3708 int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
3709 struct lttng_kernel_channel_buffer *chan,
3710 struct lttng_kernel_event_recorder *event_recorder)
3711 {
3712 int ret = 0;
3713
3714 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3715 return 0;
3716 if (chan->priv->channel_type == METADATA_CHANNEL)
3717 return 0;
3718
3719 lttng_metadata_begin(session);
3720
3721 ret = lttng_metadata_printf(session,
3722 "event {\n"
3723 " name = \"%s\";\n"
3724 " id = %u;\n"
3725 " stream_id = %u;\n",
3726 event_recorder->priv->parent.desc->event_name,
3727 event_recorder->priv->id,
3728 event_recorder->chan->priv->id);
3729 if (ret)
3730 goto end;
3731
3732 ret = lttng_metadata_printf(session,
3733 " fields := struct {\n"
3734 );
3735 if (ret)
3736 goto end;
3737
3738 ret = _lttng_fields_metadata_statedump(session, event_recorder);
3739 if (ret)
3740 goto end;
3741
3742 /*
3743 * LTTng space reservation can only reserve multiples of the
3744 * byte size.
3745 */
3746 ret = lttng_metadata_printf(session,
3747 " };\n"
3748 "};\n\n");
3749 if (ret)
3750 goto end;
3751
3752 event_recorder->priv->metadata_dumped = 1;
3753 end:
3754 lttng_metadata_end(session);
3755 return ret;
3756
3757 }
3758
3759 /*
3760 * Must be called with sessions_mutex held.
3761 * The entire channel metadata is printed as a single atomic metadata
3762 * transaction.
3763 */
3764 static
3765 int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
3766 struct lttng_kernel_channel_buffer *chan)
3767 {
3768 int ret = 0;
3769
3770 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3771 return 0;
3772
3773 if (chan->priv->channel_type == METADATA_CHANNEL)
3774 return 0;
3775
3776 lttng_metadata_begin(session);
3777
3778 WARN_ON_ONCE(!chan->priv->header_type);
3779 ret = lttng_metadata_printf(session,
3780 "stream {\n"
3781 " id = %u;\n"
3782 " event.header := %s;\n"
3783 " packet.context := struct packet_context;\n",
3784 chan->priv->id,
3785 chan->priv->header_type == 1 ? "struct event_header_compact" :
3786 "struct event_header_large");
3787 if (ret)
3788 goto end;
3789
3790 if (chan->priv->ctx) {
3791 ret = lttng_metadata_printf(session,
3792 " event.context := struct {\n");
3793 if (ret)
3794 goto end;
3795 }
3796 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
3797 if (ret)
3798 goto end;
3799 if (chan->priv->ctx) {
3800 ret = lttng_metadata_printf(session,
3801 " };\n");
3802 if (ret)
3803 goto end;
3804 }
3805
3806 ret = lttng_metadata_printf(session,
3807 "};\n\n");
3808
3809 chan->priv->metadata_dumped = 1;
3810 end:
3811 lttng_metadata_end(session);
3812 return ret;
3813 }
3814
3815 /*
3816 * Must be called with sessions_mutex held.
3817 */
3818 static
3819 int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
3820 {
3821 return lttng_metadata_printf(session,
3822 "struct packet_context {\n"
3823 " uint64_clock_monotonic_t timestamp_begin;\n"
3824 " uint64_clock_monotonic_t timestamp_end;\n"
3825 " uint64_t content_size;\n"
3826 " uint64_t packet_size;\n"
3827 " uint64_t packet_seq_num;\n"
3828 " unsigned long events_discarded;\n"
3829 " uint32_t cpu_id;\n"
3830 "};\n\n"
3831 );
3832 }
3833
3834 /*
3835 * Compact header:
3836 * id: range: 0 - 30.
3837 * id 31 is reserved to indicate an extended header.
3838 *
3839 * Large header:
3840 * id: range: 0 - 65534.
3841 * id 65535 is reserved to indicate an extended header.
3842 *
3843 * Must be called with sessions_mutex held.
3844 */
3845 static
3846 int _lttng_event_header_declare(struct lttng_kernel_session *session)
3847 {
3848 return lttng_metadata_printf(session,
3849 "struct event_header_compact {\n"
3850 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3851 " variant <id> {\n"
3852 " struct {\n"
3853 " uint27_clock_monotonic_t timestamp;\n"
3854 " } compact;\n"
3855 " struct {\n"
3856 " uint32_t id;\n"
3857 " uint64_clock_monotonic_t timestamp;\n"
3858 " } extended;\n"
3859 " } v;\n"
3860 "} align(%u);\n"
3861 "\n"
3862 "struct event_header_large {\n"
3863 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3864 " variant <id> {\n"
3865 " struct {\n"
3866 " uint32_clock_monotonic_t timestamp;\n"
3867 " } compact;\n"
3868 " struct {\n"
3869 " uint32_t id;\n"
3870 " uint64_clock_monotonic_t timestamp;\n"
3871 " } extended;\n"
3872 " } v;\n"
3873 "} align(%u);\n\n",
3874 lttng_alignof(uint32_t) * CHAR_BIT,
3875 lttng_alignof(uint16_t) * CHAR_BIT
3876 );
3877 }
3878
3879 /*
3880 * Approximation of NTP time of day to clock monotonic correlation,
3881 * taken at start of trace.
3882 * Yes, this is only an approximation. Yes, we can (and will) do better
3883 * in future versions.
3884 * This function may return a negative offset. It may happen if the
3885 * system sets the REALTIME clock to 0 after boot.
3886 *
3887 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3888 * y2038 compliant.
3889 */
3890 static
3891 int64_t measure_clock_offset(void)
3892 {
3893 uint64_t monotonic_avg, monotonic[2], realtime;
3894 uint64_t tcf = trace_clock_freq();
3895 int64_t offset;
3896 unsigned long flags;
3897 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3898 struct timespec64 rts = { 0, 0 };
3899 #else
3900 struct timespec rts = { 0, 0 };
3901 #endif
3902
3903 /* Disable interrupts to increase correlation precision. */
3904 local_irq_save(flags);
3905 monotonic[0] = trace_clock_read64();
3906 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3907 ktime_get_real_ts64(&rts);
3908 #else
3909 getnstimeofday(&rts);
3910 #endif
3911 monotonic[1] = trace_clock_read64();
3912 local_irq_restore(flags);
3913
3914 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
3915 realtime = (uint64_t) rts.tv_sec * tcf;
3916 if (tcf == NSEC_PER_SEC) {
3917 realtime += rts.tv_nsec;
3918 } else {
3919 uint64_t n = rts.tv_nsec * tcf;
3920
3921 do_div(n, NSEC_PER_SEC);
3922 realtime += n;
3923 }
3924 offset = (int64_t) realtime - monotonic_avg;
3925 return offset;
3926 }
3927
3928 static
3929 int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3930 {
3931 int ret = 0;
3932 size_t i;
3933 char cur;
3934
3935 i = 0;
3936 cur = string[i];
3937 while (cur != '\0') {
3938 switch (cur) {
3939 case '\n':
3940 ret = lttng_metadata_printf(session, "%s", "\\n");
3941 break;
3942 case '\\':
3943 case '"':
3944 ret = lttng_metadata_printf(session, "%c", '\\');
3945 if (ret)
3946 goto error;
3947 /* We still print the current char */
3948 lttng_fallthrough;
3949 default:
3950 ret = lttng_metadata_printf(session, "%c", cur);
3951 break;
3952 }
3953
3954 if (ret)
3955 goto error;
3956
3957 cur = string[++i];
3958 }
3959 error:
3960 return ret;
3961 }
3962
3963 static
3964 int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
3965 const char *field_value)
3966 {
3967 int ret;
3968
3969 ret = lttng_metadata_printf(session, " %s = \"", field);
3970 if (ret)
3971 goto error;
3972
3973 ret = print_escaped_ctf_string(session, field_value);
3974 if (ret)
3975 goto error;
3976
3977 ret = lttng_metadata_printf(session, "\";\n");
3978
3979 error:
3980 return ret;
3981 }
3982
3983 /*
3984 * Output metadata into this session's metadata buffers.
3985 * Must be called with sessions_mutex held.
3986 */
3987 static
3988 int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
3989 {
3990 unsigned char *uuid_c = session->priv->uuid.b;
3991 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
3992 const char *product_uuid;
3993 struct lttng_kernel_channel_buffer_private *chan_priv;
3994 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3995 int ret = 0;
3996
3997 if (!LTTNG_READ_ONCE(session->active))
3998 return 0;
3999
4000 lttng_metadata_begin(session);
4001
4002 if (session->priv->metadata_dumped)
4003 goto skip_session;
4004
4005 snprintf(uuid_s, sizeof(uuid_s),
4006 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
4007 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
4008 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
4009 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
4010 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
4011
4012 ret = lttng_metadata_printf(session,
4013 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4014 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4015 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4016 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4017 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4018 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4019 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4020 "\n"
4021 "trace {\n"
4022 " major = %u;\n"
4023 " minor = %u;\n"
4024 " uuid = \"%s\";\n"
4025 " byte_order = %s;\n"
4026 " packet.header := struct {\n"
4027 " uint32_t magic;\n"
4028 " uint8_t uuid[16];\n"
4029 " uint32_t stream_id;\n"
4030 " uint64_t stream_instance_id;\n"
4031 " };\n"
4032 "};\n\n",
4033 lttng_alignof(uint8_t) * CHAR_BIT,
4034 lttng_alignof(uint16_t) * CHAR_BIT,
4035 lttng_alignof(uint32_t) * CHAR_BIT,
4036 lttng_alignof(uint64_t) * CHAR_BIT,
4037 sizeof(unsigned long) * CHAR_BIT,
4038 lttng_alignof(unsigned long) * CHAR_BIT,
4039 CTF_SPEC_MAJOR,
4040 CTF_SPEC_MINOR,
4041 uuid_s,
4042 #if __BYTE_ORDER == __BIG_ENDIAN
4043 "be"
4044 #else
4045 "le"
4046 #endif
4047 );
4048 if (ret)
4049 goto end;
4050
4051 ret = lttng_metadata_printf(session,
4052 "env {\n"
4053 " hostname = \"%s\";\n"
4054 " domain = \"kernel\";\n"
4055 " sysname = \"%s\";\n"
4056 " kernel_release = \"%s\";\n"
4057 " kernel_version = \"%s\";\n"
4058 " tracer_name = \"lttng-modules\";\n"
4059 " tracer_major = %d;\n"
4060 " tracer_minor = %d;\n"
4061 " tracer_patchlevel = %d;\n"
4062 " trace_buffering_scheme = \"global\";\n",
4063 current->nsproxy->uts_ns->name.nodename,
4064 utsname()->sysname,
4065 utsname()->release,
4066 utsname()->version,
4067 LTTNG_MODULES_MAJOR_VERSION,
4068 LTTNG_MODULES_MINOR_VERSION,
4069 LTTNG_MODULES_PATCHLEVEL_VERSION
4070 );
4071 if (ret)
4072 goto end;
4073
4074 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
4075 if (ret)
4076 goto end;
4077 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
4078 session->priv->creation_time);
4079 if (ret)
4080 goto end;
4081
4082 /* Add the product UUID to the 'env' section */
4083 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4084 if (product_uuid) {
4085 ret = lttng_metadata_printf(session,
4086 " product_uuid = \"%s\";\n",
4087 product_uuid
4088 );
4089 if (ret)
4090 goto end;
4091 }
4092
4093 /* Close the 'env' section */
4094 ret = lttng_metadata_printf(session, "};\n\n");
4095 if (ret)
4096 goto end;
4097
4098 ret = lttng_metadata_printf(session,
4099 "clock {\n"
4100 " name = \"%s\";\n",
4101 trace_clock_name()
4102 );
4103 if (ret)
4104 goto end;
4105
4106 if (!trace_clock_uuid(clock_uuid_s)) {
4107 ret = lttng_metadata_printf(session,
4108 " uuid = \"%s\";\n",
4109 clock_uuid_s
4110 );
4111 if (ret)
4112 goto end;
4113 }
4114
4115 ret = lttng_metadata_printf(session,
4116 " description = \"%s\";\n"
4117 " freq = %llu; /* Frequency, in Hz */\n"
4118 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4119 " offset = %lld;\n"
4120 "};\n\n",
4121 trace_clock_description(),
4122 (unsigned long long) trace_clock_freq(),
4123 (long long) measure_clock_offset()
4124 );
4125 if (ret)
4126 goto end;
4127
4128 ret = lttng_metadata_printf(session,
4129 "typealias integer {\n"
4130 " size = 27; align = 1; signed = false;\n"
4131 " map = clock.%s.value;\n"
4132 "} := uint27_clock_monotonic_t;\n"
4133 "\n"
4134 "typealias integer {\n"
4135 " size = 32; align = %u; signed = false;\n"
4136 " map = clock.%s.value;\n"
4137 "} := uint32_clock_monotonic_t;\n"
4138 "\n"
4139 "typealias integer {\n"
4140 " size = 64; align = %u; signed = false;\n"
4141 " map = clock.%s.value;\n"
4142 "} := uint64_clock_monotonic_t;\n\n",
4143 trace_clock_name(),
4144 lttng_alignof(uint32_t) * CHAR_BIT,
4145 trace_clock_name(),
4146 lttng_alignof(uint64_t) * CHAR_BIT,
4147 trace_clock_name()
4148 );
4149 if (ret)
4150 goto end;
4151
4152 ret = _lttng_stream_packet_context_declare(session);
4153 if (ret)
4154 goto end;
4155
4156 ret = _lttng_event_header_declare(session);
4157 if (ret)
4158 goto end;
4159
4160 skip_session:
4161 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4162 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
4163 if (ret)
4164 goto end;
4165 }
4166
4167 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
4168 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4169 event_recorder_priv->pub);
4170 if (ret)
4171 goto end;
4172 }
4173 session->priv->metadata_dumped = 1;
4174 end:
4175 lttng_metadata_end(session);
4176 return ret;
4177 }
4178
4179 /**
4180 * lttng_transport_register - LTT transport registration
4181 * @transport: transport structure
4182 *
4183 * Registers a transport which can be used as output to extract the data out of
4184 * LTTng. The module calling this registration function must ensure that no
4185 * trap-inducing code will be executed by the transport functions. E.g.
4186 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4187 * is made visible to the transport function. This registration acts as a
4188 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4189 * after its registration must it synchronize the TLBs.
4190 */
4191 void lttng_transport_register(struct lttng_transport *transport)
4192 {
4193 /*
4194 * Make sure no page fault can be triggered by the module about to be
4195 * registered. We deal with this here so we don't have to call
4196 * vmalloc_sync_mappings() in each module's init.
4197 */
4198 wrapper_vmalloc_sync_mappings();
4199
4200 mutex_lock(&sessions_mutex);
4201 list_add_tail(&transport->node, &lttng_transport_list);
4202 mutex_unlock(&sessions_mutex);
4203 }
4204 EXPORT_SYMBOL_GPL(lttng_transport_register);
4205
4206 /**
4207 * lttng_transport_unregister - LTT transport unregistration
4208 * @transport: transport structure
4209 */
4210 void lttng_transport_unregister(struct lttng_transport *transport)
4211 {
4212 mutex_lock(&sessions_mutex);
4213 list_del(&transport->node);
4214 mutex_unlock(&sessions_mutex);
4215 }
4216 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
4217
4218 void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4219 {
4220 /*
4221 * Make sure no page fault can be triggered by the module about to be
4222 * registered. We deal with this here so we don't have to call
4223 * vmalloc_sync_mappings() in each module's init.
4224 */
4225 wrapper_vmalloc_sync_mappings();
4226
4227 mutex_lock(&sessions_mutex);
4228 list_add_tail(&transport->node, &lttng_counter_transport_list);
4229 mutex_unlock(&sessions_mutex);
4230 }
4231 EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4232
4233 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4234 {
4235 mutex_lock(&sessions_mutex);
4236 list_del(&transport->node);
4237 mutex_unlock(&sessions_mutex);
4238 }
4239 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4240
4241 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4242
4243 enum cpuhp_state lttng_hp_prepare;
4244 enum cpuhp_state lttng_hp_online;
4245
4246 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4247 {
4248 struct lttng_cpuhp_node *lttng_node;
4249
4250 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4251 switch (lttng_node->component) {
4252 case LTTNG_RING_BUFFER_FRONTEND:
4253 return 0;
4254 case LTTNG_RING_BUFFER_BACKEND:
4255 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4256 case LTTNG_RING_BUFFER_ITER:
4257 return 0;
4258 case LTTNG_CONTEXT_PERF_COUNTERS:
4259 return 0;
4260 default:
4261 return -EINVAL;
4262 }
4263 }
4264
4265 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4266 {
4267 struct lttng_cpuhp_node *lttng_node;
4268
4269 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4270 switch (lttng_node->component) {
4271 case LTTNG_RING_BUFFER_FRONTEND:
4272 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4273 case LTTNG_RING_BUFFER_BACKEND:
4274 return 0;
4275 case LTTNG_RING_BUFFER_ITER:
4276 return 0;
4277 case LTTNG_CONTEXT_PERF_COUNTERS:
4278 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4279 default:
4280 return -EINVAL;
4281 }
4282 }
4283
4284 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4285 {
4286 struct lttng_cpuhp_node *lttng_node;
4287
4288 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4289 switch (lttng_node->component) {
4290 case LTTNG_RING_BUFFER_FRONTEND:
4291 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4292 case LTTNG_RING_BUFFER_BACKEND:
4293 return 0;
4294 case LTTNG_RING_BUFFER_ITER:
4295 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4296 case LTTNG_CONTEXT_PERF_COUNTERS:
4297 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4298 default:
4299 return -EINVAL;
4300 }
4301 }
4302
4303 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4304 {
4305 struct lttng_cpuhp_node *lttng_node;
4306
4307 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4308 switch (lttng_node->component) {
4309 case LTTNG_RING_BUFFER_FRONTEND:
4310 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4311 case LTTNG_RING_BUFFER_BACKEND:
4312 return 0;
4313 case LTTNG_RING_BUFFER_ITER:
4314 return 0;
4315 case LTTNG_CONTEXT_PERF_COUNTERS:
4316 return 0;
4317 default:
4318 return -EINVAL;
4319 }
4320 }
4321
4322 static int __init lttng_init_cpu_hotplug(void)
4323 {
4324 int ret;
4325
4326 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4327 lttng_hotplug_prepare,
4328 lttng_hotplug_dead);
4329 if (ret < 0) {
4330 return ret;
4331 }
4332 lttng_hp_prepare = ret;
4333 lttng_rb_set_hp_prepare(ret);
4334
4335 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4336 lttng_hotplug_online,
4337 lttng_hotplug_offline);
4338 if (ret < 0) {
4339 cpuhp_remove_multi_state(lttng_hp_prepare);
4340 lttng_hp_prepare = 0;
4341 return ret;
4342 }
4343 lttng_hp_online = ret;
4344 lttng_rb_set_hp_online(ret);
4345
4346 return 0;
4347 }
4348
4349 static void __exit lttng_exit_cpu_hotplug(void)
4350 {
4351 lttng_rb_set_hp_online(0);
4352 cpuhp_remove_multi_state(lttng_hp_online);
4353 lttng_rb_set_hp_prepare(0);
4354 cpuhp_remove_multi_state(lttng_hp_prepare);
4355 }
4356
4357 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4358 static int lttng_init_cpu_hotplug(void)
4359 {
4360 return 0;
4361 }
4362 static void lttng_exit_cpu_hotplug(void)
4363 {
4364 }
4365 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4366
4367 static int __init lttng_events_init(void)
4368 {
4369 int ret;
4370
4371 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4372 if (ret)
4373 return ret;
4374 ret = wrapper_get_pfnblock_flags_mask_init();
4375 if (ret)
4376 return ret;
4377 ret = wrapper_get_pageblock_flags_mask_init();
4378 if (ret)
4379 return ret;
4380 ret = lttng_probes_init();
4381 if (ret)
4382 return ret;
4383 ret = lttng_context_init();
4384 if (ret)
4385 return ret;
4386 ret = lttng_tracepoint_init();
4387 if (ret)
4388 goto error_tp;
4389 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4390 if (!event_recorder_cache) {
4391 ret = -ENOMEM;
4392 goto error_kmem_event_recorder;
4393 }
4394 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4395 if (!event_recorder_private_cache) {
4396 ret = -ENOMEM;
4397 goto error_kmem_event_recorder_private;
4398 }
4399 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
4400 if (!event_notifier_cache) {
4401 ret = -ENOMEM;
4402 goto error_kmem_event_notifier;
4403 }
4404 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4405 if (!event_notifier_private_cache) {
4406 ret = -ENOMEM;
4407 goto error_kmem_event_notifier_private;
4408 }
4409 ret = lttng_abi_init();
4410 if (ret)
4411 goto error_abi;
4412 ret = lttng_logger_init();
4413 if (ret)
4414 goto error_logger;
4415 ret = lttng_init_cpu_hotplug();
4416 if (ret)
4417 goto error_hotplug;
4418 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4419 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4420 __stringify(LTTNG_MODULES_MINOR_VERSION),
4421 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4422 LTTNG_MODULES_EXTRAVERSION,
4423 LTTNG_VERSION_NAME,
4424 #ifdef LTTNG_EXTRA_VERSION_GIT
4425 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4426 #else
4427 "",
4428 #endif
4429 #ifdef LTTNG_EXTRA_VERSION_NAME
4430 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4431 #else
4432 "");
4433 #endif
4434 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4435 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4436 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4437 return 0;
4438
4439 error_hotplug:
4440 lttng_logger_exit();
4441 error_logger:
4442 lttng_abi_exit();
4443 error_abi:
4444 kmem_cache_destroy(event_notifier_private_cache);
4445 error_kmem_event_notifier_private:
4446 kmem_cache_destroy(event_notifier_cache);
4447 error_kmem_event_notifier:
4448 kmem_cache_destroy(event_recorder_private_cache);
4449 error_kmem_event_recorder_private:
4450 kmem_cache_destroy(event_recorder_cache);
4451 error_kmem_event_recorder:
4452 lttng_tracepoint_exit();
4453 error_tp:
4454 lttng_context_exit();
4455 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4456 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4457 __stringify(LTTNG_MODULES_MINOR_VERSION),
4458 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4459 LTTNG_MODULES_EXTRAVERSION,
4460 LTTNG_VERSION_NAME,
4461 #ifdef LTTNG_EXTRA_VERSION_GIT
4462 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4463 #else
4464 "",
4465 #endif
4466 #ifdef LTTNG_EXTRA_VERSION_NAME
4467 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4468 #else
4469 "");
4470 #endif
4471 return ret;
4472 }
4473
4474 module_init(lttng_events_init);
4475
4476 static void __exit lttng_events_exit(void)
4477 {
4478 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
4479
4480 lttng_exit_cpu_hotplug();
4481 lttng_logger_exit();
4482 lttng_abi_exit();
4483 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4484 lttng_session_destroy(session_priv->pub);
4485 kmem_cache_destroy(event_recorder_cache);
4486 kmem_cache_destroy(event_recorder_private_cache);
4487 kmem_cache_destroy(event_notifier_cache);
4488 kmem_cache_destroy(event_notifier_private_cache);
4489 lttng_tracepoint_exit();
4490 lttng_context_exit();
4491 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4492 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4493 __stringify(LTTNG_MODULES_MINOR_VERSION),
4494 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4495 LTTNG_MODULES_EXTRAVERSION,
4496 LTTNG_VERSION_NAME,
4497 #ifdef LTTNG_EXTRA_VERSION_GIT
4498 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4499 #else
4500 "",
4501 #endif
4502 #ifdef LTTNG_EXTRA_VERSION_NAME
4503 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4504 #else
4505 "");
4506 #endif
4507 }
4508
4509 module_exit(lttng_events_exit);
4510
4511 #include <generated/patches.h>
4512 #ifdef LTTNG_EXTRA_VERSION_GIT
4513 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4514 #endif
4515 #ifdef LTTNG_EXTRA_VERSION_NAME
4516 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4517 #endif
4518 MODULE_LICENSE("GPL and additional rights");
4519 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4520 MODULE_DESCRIPTION("LTTng tracer");
4521 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4522 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
4523 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4524 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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