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Refactoring: combine create event common code
[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 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
1949 struct lttng_event_enabler_common *enabler)
1950 {
1951 const char *desc_name, *enabler_name;
1952 bool compat = false, entry = false;
1953
1954 enabler_name = enabler->event_param.name;
1955 switch (enabler->event_param.instrumentation) {
1956 case LTTNG_KERNEL_ABI_TRACEPOINT:
1957 desc_name = desc->event_name;
1958 switch (enabler->format_type) {
1959 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
1960 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1961 case LTTNG_ENABLER_FORMAT_NAME:
1962 return lttng_match_enabler_name(desc_name, enabler_name);
1963 default:
1964 return -EINVAL;
1965 }
1966 break;
1967
1968 case LTTNG_KERNEL_ABI_SYSCALL:
1969 desc_name = desc->event_name;
1970 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
1971 desc_name += strlen("compat_");
1972 compat = true;
1973 }
1974 if (!strncmp(desc_name, "syscall_exit_",
1975 strlen("syscall_exit_"))) {
1976 desc_name += strlen("syscall_exit_");
1977 } else if (!strncmp(desc_name, "syscall_entry_",
1978 strlen("syscall_entry_"))) {
1979 desc_name += strlen("syscall_entry_");
1980 entry = true;
1981 } else {
1982 WARN_ON_ONCE(1);
1983 return -EINVAL;
1984 }
1985 switch (enabler->event_param.u.syscall.entryexit) {
1986 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
1987 break;
1988 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1989 if (!entry)
1990 return 0;
1991 break;
1992 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1993 if (entry)
1994 return 0;
1995 break;
1996 default:
1997 return -EINVAL;
1998 }
1999 switch (enabler->event_param.u.syscall.abi) {
2000 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
2001 break;
2002 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
2003 if (compat)
2004 return 0;
2005 break;
2006 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
2007 if (!compat)
2008 return 0;
2009 break;
2010 default:
2011 return -EINVAL;
2012 }
2013 switch (enabler->event_param.u.syscall.match) {
2014 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
2015 switch (enabler->format_type) {
2016 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
2017 return lttng_match_enabler_star_glob(desc_name, enabler_name);
2018 case LTTNG_ENABLER_FORMAT_NAME:
2019 return lttng_match_enabler_name(desc_name, enabler_name);
2020 default:
2021 return -EINVAL;
2022 }
2023 break;
2024 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
2025 return -EINVAL; /* Not implemented. */
2026 default:
2027 return -EINVAL;
2028 }
2029 break;
2030
2031 default:
2032 WARN_ON_ONCE(1);
2033 return -EINVAL;
2034 }
2035 }
2036
2037 static
2038 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
2039 struct lttng_kernel_event_common *event)
2040 {
2041 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2042 return false;
2043
2044 switch (event_enabler->enabler_type) {
2045 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2046 {
2047 struct lttng_event_recorder_enabler *event_recorder_enabler =
2048 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2049 struct lttng_kernel_event_recorder *event_recorder =
2050 container_of(event, struct lttng_kernel_event_recorder, parent);
2051
2052 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2053 && event_recorder->chan == event_recorder_enabler->chan)
2054 return true;
2055 else
2056 return false;
2057 }
2058 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2059 {
2060 struct lttng_event_notifier_enabler *event_notifier_enabler =
2061 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2062 struct lttng_kernel_event_notifier *event_notifier =
2063 container_of(event, struct lttng_kernel_event_notifier, parent);
2064
2065 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2066 && event_notifier->priv->group == event_notifier_enabler->group
2067 && event->priv->user_token == event_enabler->user_token)
2068 return true;
2069 else
2070 return false;
2071 }
2072 default:
2073 WARN_ON_ONCE(1);
2074 return false;
2075 }
2076 }
2077
2078 static
2079 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
2080 const struct lttng_kernel_event_desc *desc,
2081 struct lttng_kernel_event_common *event)
2082 {
2083 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2084 return false;
2085
2086 switch (event_enabler->enabler_type) {
2087 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2088 {
2089 struct lttng_event_recorder_enabler *event_recorder_enabler =
2090 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2091 struct lttng_kernel_event_recorder *event_recorder =
2092 container_of(event, struct lttng_kernel_event_recorder, parent);
2093
2094 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
2095 return true;
2096 else
2097 return false;
2098 }
2099 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2100 {
2101 struct lttng_event_notifier_enabler *event_notifier_enabler =
2102 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2103 struct lttng_kernel_event_notifier *event_notifier =
2104 container_of(event, struct lttng_kernel_event_notifier, parent);
2105
2106 if (event->priv->desc == desc
2107 && event_notifier->priv->group == event_notifier_enabler->group
2108 && event->priv->user_token == event_enabler->user_token)
2109 return true;
2110 else
2111 return false;
2112 }
2113 default:
2114 WARN_ON_ONCE(1);
2115 return false;
2116 }
2117 }
2118
2119 static
2120 struct lttng_enabler_ref *lttng_enabler_ref(
2121 struct list_head *enablers_ref_list,
2122 struct lttng_event_enabler_common *enabler)
2123 {
2124 struct lttng_enabler_ref *enabler_ref;
2125
2126 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
2127 if (enabler_ref->ref == enabler)
2128 return enabler_ref;
2129 }
2130 return NULL;
2131 }
2132
2133 static
2134 void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
2135 {
2136 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
2137 struct lttng_kernel_probe_desc *probe_desc;
2138 const struct lttng_kernel_event_desc *desc;
2139 int i;
2140 struct list_head *probe_list;
2141
2142 probe_list = lttng_get_probe_list_head();
2143 /*
2144 * For each probe event, if we find that a probe event matches
2145 * our enabler, create an associated lttng_event if not
2146 * already present.
2147 */
2148 list_for_each_entry(probe_desc, probe_list, head) {
2149 for (i = 0; i < probe_desc->nr_events; i++) {
2150 int found = 0;
2151 struct hlist_head *head;
2152 struct lttng_kernel_event_common *event;
2153 struct lttng_kernel_event_common_private *event_priv;
2154
2155 desc = probe_desc->event_desc[i];
2156 if (!lttng_desc_match_enabler(desc,
2157 lttng_event_recorder_enabler_as_enabler(event_enabler)))
2158 continue;
2159
2160 /*
2161 * Check if already created.
2162 */
2163 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
2164 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
2165 if (lttng_event_enabler_desc_match_event(&event_enabler->parent, desc, event_priv->pub))
2166 found = 1;
2167 }
2168 if (found)
2169 continue;
2170
2171 /*
2172 * We need to create an event for this event probe.
2173 */
2174 event = _lttng_kernel_event_create(&event_enabler->parent, desc);
2175 if (!event) {
2176 printk(KERN_INFO "LTTng: Unable to create event %s\n",
2177 probe_desc->event_desc[i]->event_name);
2178 }
2179 }
2180 }
2181 }
2182
2183 static
2184 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2185 {
2186 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent);
2187 struct lttng_kernel_probe_desc *probe_desc;
2188 const struct lttng_kernel_event_desc *desc;
2189 int i;
2190 struct list_head *probe_list;
2191
2192 probe_list = lttng_get_probe_list_head();
2193 /*
2194 * For each probe event, if we find that a probe event matches
2195 * our enabler, create an associated lttng_event_notifier if not
2196 * already present.
2197 */
2198 list_for_each_entry(probe_desc, probe_list, head) {
2199 for (i = 0; i < probe_desc->nr_events; i++) {
2200 int found = 0;
2201 struct hlist_head *head;
2202 struct lttng_kernel_event_common *event;
2203 struct lttng_kernel_event_common_private *event_priv;
2204
2205 desc = probe_desc->event_desc[i];
2206 if (!lttng_desc_match_enabler(desc,
2207 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2208 continue;
2209
2210 /*
2211 * Check if already created.
2212 */
2213 head = utils_borrow_hash_table_bucket(events_ht->table,
2214 LTTNG_EVENT_HT_SIZE, desc->event_name);
2215 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
2216 if (lttng_event_enabler_desc_match_event(&event_notifier_enabler->parent, desc, event_priv->pub))
2217 found = 1;
2218 }
2219 if (found)
2220 continue;
2221
2222 /*
2223 * We need to create a event_notifier for this event probe.
2224 */
2225 event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc);
2226 if (IS_ERR(event)) {
2227 printk(KERN_INFO "Unable to create event_notifier %s\n",
2228 probe_desc->event_desc[i]->event_name);
2229 }
2230 }
2231 }
2232 }
2233
2234 static
2235 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
2236 {
2237 int ret;
2238
2239 ret = lttng_syscalls_register_event(event_enabler);
2240 WARN_ON_ONCE(ret);
2241 }
2242
2243 /*
2244 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2245 * tracepoint probes.
2246 * Should be called with sessions mutex held.
2247 */
2248 static
2249 void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
2250 {
2251 switch (event_enabler->parent.event_param.instrumentation) {
2252 case LTTNG_KERNEL_ABI_TRACEPOINT:
2253 lttng_create_tracepoint_event_if_missing(event_enabler);
2254 break;
2255
2256 case LTTNG_KERNEL_ABI_SYSCALL:
2257 lttng_create_syscall_event_if_missing(&event_enabler->parent);
2258 break;
2259
2260 default:
2261 WARN_ON_ONCE(1);
2262 break;
2263 }
2264 }
2265
2266 /*
2267 * Create events associated with an event_enabler (if not already present),
2268 * and add backward reference from the event to the enabler.
2269 * Should be called with sessions mutex held.
2270 */
2271 static
2272 int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
2273 {
2274 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2275 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
2276 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
2277 struct lttng_kernel_event_recorder_private *event_recorder_priv;
2278
2279 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2280 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2281 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
2282 !strcmp(base_enabler->event_param.name, "*")) {
2283 int enabled = base_enabler->enabled;
2284 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2285
2286 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2287 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
2288
2289 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2290 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
2291 }
2292
2293 /* First ensure that probe events are created for this enabler. */
2294 lttng_create_event_if_missing(event_enabler);
2295
2296 /* For each event matching event_enabler in session event list. */
2297 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
2298 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
2299 struct lttng_enabler_ref *enabler_ref;
2300
2301 if (!lttng_event_enabler_match_event(&event_enabler->parent, &event_recorder->parent))
2302 continue;
2303 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
2304 lttng_event_recorder_enabler_as_enabler(event_enabler));
2305 if (!enabler_ref) {
2306 /*
2307 * If no backward ref, create it.
2308 * Add backward ref from event to event_enabler.
2309 */
2310 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2311 if (!enabler_ref)
2312 return -ENOMEM;
2313 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
2314 list_add(&enabler_ref->node,
2315 &event_recorder_priv->parent.enablers_ref_head);
2316 }
2317
2318 /*
2319 * Link filter bytecodes if not linked yet.
2320 */
2321 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2322 lttng_static_ctx,
2323 &event_recorder_priv->parent.filter_bytecode_runtime_head,
2324 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
2325 }
2326 return 0;
2327 }
2328
2329 /*
2330 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2331 * tracepoint probes.
2332 * Should be called with sessions mutex held.
2333 */
2334 static
2335 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2336 {
2337 switch (event_notifier_enabler->parent.event_param.instrumentation) {
2338 case LTTNG_KERNEL_ABI_TRACEPOINT:
2339 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2340 break;
2341
2342 case LTTNG_KERNEL_ABI_SYSCALL:
2343 lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent);
2344 break;
2345
2346 default:
2347 WARN_ON_ONCE(1);
2348 break;
2349 }
2350 }
2351
2352 /*
2353 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2354 */
2355 static
2356 int lttng_event_notifier_enabler_ref_event_notifiers(
2357 struct lttng_event_notifier_enabler *event_notifier_enabler)
2358 {
2359 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2360 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2361 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2362
2363 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2364 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2365 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
2366 !strcmp(base_enabler->event_param.name, "*")) {
2367
2368 int enabled = base_enabler->enabled;
2369 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2370
2371 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2372 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
2373
2374 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2375 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
2376
2377 }
2378
2379 /* First ensure that probe event_notifiers are created for this enabler. */
2380 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2381
2382 /* Link the created event_notifier with its associated enabler. */
2383 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2384 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
2385 struct lttng_enabler_ref *enabler_ref;
2386
2387 if (!lttng_event_enabler_match_event(&event_notifier_enabler->parent, &event_notifier->parent))
2388 continue;
2389
2390 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
2391 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2392 if (!enabler_ref) {
2393 /*
2394 * If no backward ref, create it.
2395 * Add backward ref from event_notifier to enabler.
2396 */
2397 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2398 if (!enabler_ref)
2399 return -ENOMEM;
2400
2401 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2402 event_notifier_enabler);
2403 list_add(&enabler_ref->node,
2404 &event_notifier_priv->parent.enablers_ref_head);
2405 }
2406
2407 /*
2408 * Link filter bytecodes if not linked yet.
2409 */
2410 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2411 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
2412 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
2413
2414 /* Link capture bytecodes if not linked yet. */
2415 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2416 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
2417 &event_notifier_enabler->capture_bytecode_head);
2418
2419 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
2420 }
2421 return 0;
2422 }
2423
2424 /*
2425 * Called at module load: connect the probe on all enablers matching
2426 * this event.
2427 * Called with sessions lock held.
2428 */
2429 int lttng_fix_pending_events(void)
2430 {
2431 struct lttng_kernel_session_private *session_priv;
2432
2433 list_for_each_entry(session_priv, &sessions, list)
2434 lttng_session_lazy_sync_event_enablers(session_priv->pub);
2435 return 0;
2436 }
2437
2438 static bool lttng_event_notifier_group_has_active_event_notifiers(
2439 struct lttng_event_notifier_group *event_notifier_group)
2440 {
2441 struct lttng_event_notifier_enabler *event_notifier_enabler;
2442
2443 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2444 node) {
2445 if (event_notifier_enabler->parent.enabled)
2446 return true;
2447 }
2448 return false;
2449 }
2450
2451 bool lttng_event_notifier_active(void)
2452 {
2453 struct lttng_event_notifier_group *event_notifier_group;
2454
2455 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2456 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2457 return true;
2458 }
2459 return false;
2460 }
2461
2462 int lttng_fix_pending_event_notifiers(void)
2463 {
2464 struct lttng_event_notifier_group *event_notifier_group;
2465
2466 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2467 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2468 return 0;
2469 }
2470
2471 struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
2472 enum lttng_enabler_format_type format_type,
2473 struct lttng_kernel_abi_event *event_param,
2474 struct lttng_kernel_channel_buffer *chan)
2475 {
2476 struct lttng_event_recorder_enabler *event_enabler;
2477
2478 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2479 if (!event_enabler)
2480 return NULL;
2481 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
2482 event_enabler->parent.format_type = format_type;
2483 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2484 memcpy(&event_enabler->parent.event_param, event_param,
2485 sizeof(event_enabler->parent.event_param));
2486 event_enabler->chan = chan;
2487 /* ctx left NULL */
2488 event_enabler->parent.enabled = 0;
2489 return event_enabler;
2490 }
2491
2492 void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
2493 struct lttng_event_recorder_enabler *event_enabler)
2494 {
2495 mutex_lock(&sessions_mutex);
2496 list_add(&event_enabler->node, &session->priv->enablers_head);
2497 event_enabler->published = true;
2498 lttng_session_lazy_sync_event_enablers(session);
2499 mutex_unlock(&sessions_mutex);
2500 }
2501
2502 int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
2503 {
2504 mutex_lock(&sessions_mutex);
2505 event_enabler->enabled = 1;
2506 lttng_event_enabler_sync(event_enabler);
2507 mutex_unlock(&sessions_mutex);
2508 return 0;
2509 }
2510
2511 int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
2512 {
2513 mutex_lock(&sessions_mutex);
2514 event_enabler->enabled = 0;
2515 lttng_event_enabler_sync(event_enabler);
2516 mutex_unlock(&sessions_mutex);
2517 return 0;
2518 }
2519
2520 static
2521 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
2522 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
2523 {
2524 struct lttng_kernel_bytecode_node *bytecode_node;
2525 uint32_t bytecode_len;
2526 int ret;
2527
2528 ret = get_user(bytecode_len, &bytecode->len);
2529 if (ret)
2530 return ret;
2531 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2532 GFP_KERNEL);
2533 if (!bytecode_node)
2534 return -ENOMEM;
2535 ret = copy_from_user(&bytecode_node->bc, bytecode,
2536 sizeof(*bytecode) + bytecode_len);
2537 if (ret)
2538 goto error_free;
2539
2540 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
2541 bytecode_node->enabler = enabler;
2542 /* Enforce length based on allocated size */
2543 bytecode_node->bc.len = bytecode_len;
2544 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
2545
2546 return 0;
2547
2548 error_free:
2549 lttng_kvfree(bytecode_node);
2550 return ret;
2551 }
2552
2553 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
2554 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
2555 {
2556 int ret;
2557 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
2558 if (ret)
2559 goto error;
2560 lttng_event_enabler_sync(event_enabler);
2561 return 0;
2562
2563 error:
2564 return ret;
2565 }
2566
2567 int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
2568 struct lttng_kernel_abi_event_callsite __user *callsite)
2569 {
2570
2571 switch (event->priv->instrumentation) {
2572 case LTTNG_KERNEL_ABI_UPROBE:
2573 return lttng_uprobes_event_add_callsite(event, callsite);
2574 default:
2575 return -EINVAL;
2576 }
2577 }
2578
2579 static
2580 void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
2581 {
2582 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
2583
2584 /* Destroy filter bytecode */
2585 list_for_each_entry_safe(filter_node, tmp_filter_node,
2586 &enabler->filter_bytecode_head, node) {
2587 lttng_kvfree(filter_node);
2588 }
2589 }
2590
2591 void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
2592 {
2593 switch (event_enabler->enabler_type) {
2594 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2595 {
2596 struct lttng_event_recorder_enabler *event_recorder_enabler =
2597 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2598
2599 lttng_enabler_destroy(event_enabler);
2600 if (event_recorder_enabler->published)
2601 list_del(&event_recorder_enabler->node);
2602 kfree(event_recorder_enabler);
2603 break;
2604 }
2605 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2606 {
2607 struct lttng_event_notifier_enabler *event_notifier_enabler =
2608 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2609
2610 lttng_enabler_destroy(event_enabler);
2611 if (event_notifier_enabler->published)
2612 list_del(&event_notifier_enabler->node);
2613 kfree(event_notifier_enabler);
2614 break;
2615 }
2616 default:
2617 WARN_ON_ONCE(1);
2618 }
2619 }
2620
2621 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2622 enum lttng_enabler_format_type format_type,
2623 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2624 struct lttng_event_notifier_group *event_notifier_group)
2625 {
2626 struct lttng_event_notifier_enabler *event_notifier_enabler;
2627
2628 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2629 if (!event_notifier_enabler)
2630 return NULL;
2631
2632 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
2633 event_notifier_enabler->parent.format_type = format_type;
2634 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
2635 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2636
2637 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
2638 event_notifier_enabler->num_captures = 0;
2639
2640 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2641 sizeof(event_notifier_enabler->parent.event_param));
2642
2643 event_notifier_enabler->parent.enabled = 0;
2644 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
2645 event_notifier_enabler->group = event_notifier_group;
2646 return event_notifier_enabler;
2647 }
2648
2649 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2650 struct lttng_event_notifier_enabler *event_notifier_enabler)
2651 {
2652 mutex_lock(&sessions_mutex);
2653 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
2654 event_notifier_enabler->published = true;
2655 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2656 mutex_unlock(&sessions_mutex);
2657 }
2658
2659 int lttng_event_notifier_enabler_enable(
2660 struct lttng_event_notifier_enabler *event_notifier_enabler)
2661 {
2662 mutex_lock(&sessions_mutex);
2663 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
2664 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2665 mutex_unlock(&sessions_mutex);
2666 return 0;
2667 }
2668
2669 int lttng_event_notifier_enabler_disable(
2670 struct lttng_event_notifier_enabler *event_notifier_enabler)
2671 {
2672 mutex_lock(&sessions_mutex);
2673 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
2674 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2675 mutex_unlock(&sessions_mutex);
2676 return 0;
2677 }
2678
2679 int lttng_event_notifier_enabler_attach_capture_bytecode(
2680 struct lttng_event_notifier_enabler *event_notifier_enabler,
2681 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
2682 {
2683 struct lttng_kernel_bytecode_node *bytecode_node;
2684 struct lttng_event_enabler_common *enabler =
2685 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2686 uint32_t bytecode_len;
2687 int ret;
2688
2689 ret = get_user(bytecode_len, &bytecode->len);
2690 if (ret)
2691 return ret;
2692
2693 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2694 GFP_KERNEL);
2695 if (!bytecode_node)
2696 return -ENOMEM;
2697
2698 ret = copy_from_user(&bytecode_node->bc, bytecode,
2699 sizeof(*bytecode) + bytecode_len);
2700 if (ret)
2701 goto error_free;
2702
2703 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
2704 bytecode_node->enabler = enabler;
2705
2706 /* Enforce length based on allocated size */
2707 bytecode_node->bc.len = bytecode_len;
2708 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2709
2710 event_notifier_enabler->num_captures++;
2711
2712 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2713 goto end;
2714
2715 error_free:
2716 lttng_kvfree(bytecode_node);
2717 end:
2718 return ret;
2719 }
2720
2721 /*
2722 * lttng_session_sync_event_enablers should be called just before starting a
2723 * session.
2724 * Should be called with sessions mutex held.
2725 */
2726 static
2727 void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2728 {
2729 struct lttng_event_recorder_enabler *event_enabler;
2730 struct lttng_kernel_event_recorder_private *event_recorder_priv;
2731
2732 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
2733 lttng_event_enabler_ref_events(event_enabler);
2734 /*
2735 * For each event, if at least one of its enablers is enabled,
2736 * and its channel and session transient states are enabled, we
2737 * enable the event, else we disable it.
2738 */
2739 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
2740 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
2741 struct lttng_enabler_ref *enabler_ref;
2742 struct lttng_kernel_bytecode_runtime *runtime;
2743 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2744 int nr_filters = 0;
2745
2746 switch (event_recorder_priv->parent.instrumentation) {
2747 case LTTNG_KERNEL_ABI_TRACEPOINT:
2748 lttng_fallthrough;
2749 case LTTNG_KERNEL_ABI_SYSCALL:
2750 /* Enable events */
2751 list_for_each_entry(enabler_ref,
2752 &event_recorder_priv->parent.enablers_ref_head, node) {
2753 if (enabler_ref->ref->enabled) {
2754 enabled = 1;
2755 break;
2756 }
2757 }
2758 break;
2759
2760 default:
2761 /* Not handled with lazy sync. */
2762 continue;
2763 }
2764 /*
2765 * Enabled state is based on union of enablers, with
2766 * intesection of session and channel transient enable
2767 * states.
2768 */
2769 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2770
2771 WRITE_ONCE(event_recorder->parent.enabled, enabled);
2772 /*
2773 * Sync tracepoint registration with event enabled
2774 * state.
2775 */
2776 if (enabled) {
2777 register_event(&event_recorder->parent);
2778 } else {
2779 _lttng_event_unregister(&event_recorder->parent);
2780 }
2781
2782 /* Check if has enablers without bytecode enabled */
2783 list_for_each_entry(enabler_ref,
2784 &event_recorder_priv->parent.enablers_ref_head, node) {
2785 if (enabler_ref->ref->enabled
2786 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2787 has_enablers_without_filter_bytecode = 1;
2788 break;
2789 }
2790 }
2791 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
2792 has_enablers_without_filter_bytecode;
2793
2794 /* Enable filters */
2795 list_for_each_entry(runtime,
2796 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
2797 lttng_bytecode_sync_state(runtime);
2798 nr_filters++;
2799 }
2800 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2801 !(has_enablers_without_filter_bytecode || !nr_filters));
2802 }
2803 }
2804
2805 /*
2806 * Apply enablers to session events, adding events to session if need
2807 * be. It is required after each modification applied to an active
2808 * session, and right before session "start".
2809 * "lazy" sync means we only sync if required.
2810 * Should be called with sessions mutex held.
2811 */
2812 static
2813 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
2814 {
2815 /* We can skip if session is not active */
2816 if (!session->active)
2817 return;
2818 lttng_session_sync_event_enablers(session);
2819 }
2820
2821 static
2822 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2823 {
2824 struct lttng_event_notifier_enabler *event_notifier_enabler;
2825 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2826
2827 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2828 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2829
2830 /*
2831 * For each event_notifier, if at least one of its enablers is enabled,
2832 * we enable the event_notifier, else we disable it.
2833 */
2834 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2835 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
2836 struct lttng_enabler_ref *enabler_ref;
2837 struct lttng_kernel_bytecode_runtime *runtime;
2838 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2839 int nr_filters = 0, nr_captures = 0;
2840
2841 switch (event_notifier_priv->parent.instrumentation) {
2842 case LTTNG_KERNEL_ABI_TRACEPOINT:
2843 lttng_fallthrough;
2844 case LTTNG_KERNEL_ABI_SYSCALL:
2845 /* Enable event_notifiers */
2846 list_for_each_entry(enabler_ref,
2847 &event_notifier_priv->parent.enablers_ref_head, node) {
2848 if (enabler_ref->ref->enabled) {
2849 enabled = 1;
2850 break;
2851 }
2852 }
2853 break;
2854
2855 default:
2856 /* Not handled with sync. */
2857 continue;
2858 }
2859
2860 WRITE_ONCE(event_notifier->parent.enabled, enabled);
2861 /*
2862 * Sync tracepoint registration with event_notifier enabled
2863 * state.
2864 */
2865 if (enabled) {
2866 if (!event_notifier_priv->parent.registered)
2867 register_event(&event_notifier->parent);
2868 } else {
2869 if (event_notifier_priv->parent.registered)
2870 _lttng_event_unregister(&event_notifier->parent);
2871 }
2872
2873 /* Check if has enablers without bytecode enabled */
2874 list_for_each_entry(enabler_ref,
2875 &event_notifier_priv->parent.enablers_ref_head, node) {
2876 if (enabler_ref->ref->enabled
2877 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2878 has_enablers_without_filter_bytecode = 1;
2879 break;
2880 }
2881 }
2882 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
2883 has_enablers_without_filter_bytecode;
2884
2885 /* Enable filters */
2886 list_for_each_entry(runtime,
2887 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
2888 lttng_bytecode_sync_state(runtime);
2889 nr_filters++;
2890 }
2891 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2892 !(has_enablers_without_filter_bytecode || !nr_filters));
2893
2894 /* Enable captures */
2895 list_for_each_entry(runtime,
2896 &event_notifier_priv->capture_bytecode_runtime_head, node) {
2897 lttng_bytecode_sync_state(runtime);
2898 nr_captures++;
2899 }
2900 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2901 }
2902 }
2903
2904 static
2905 void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2906 {
2907 switch (event_enabler->enabler_type) {
2908 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2909 {
2910 struct lttng_event_recorder_enabler *event_recorder_enabler =
2911 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2912 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2913 break;
2914 }
2915 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2916 {
2917 struct lttng_event_notifier_enabler *event_notifier_enabler =
2918 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2919 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2920 break;
2921 }
2922 default:
2923 WARN_ON_ONCE(1);
2924 }
2925 }
2926
2927 /*
2928 * Serialize at most one packet worth of metadata into a metadata
2929 * channel.
2930 * We grab the metadata cache mutex to get exclusive access to our metadata
2931 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2932 * allows us to do racy operations such as looking for remaining space left in
2933 * packet and write, since mutual exclusion protects us from concurrent writes.
2934 * Mutual exclusion on the metadata cache allow us to read the cache content
2935 * without racing against reallocation of the cache by updates.
2936 * Returns the number of bytes written in the channel, 0 if no data
2937 * was written and a negative value on error.
2938 */
2939 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
2940 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
2941 {
2942 struct lttng_kernel_ring_buffer_ctx ctx;
2943 int ret = 0;
2944 size_t len, reserve_len;
2945
2946 /*
2947 * Ensure we support mutiple get_next / put sequences followed by
2948 * put_next. The metadata cache lock protects reading the metadata
2949 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2950 * "flush" operations on the buffer invoked by different processes.
2951 * Moreover, since the metadata cache memory can be reallocated, we
2952 * need to have exclusive access against updates even though we only
2953 * read it.
2954 */
2955 mutex_lock(&stream->metadata_cache->lock);
2956 WARN_ON(stream->metadata_in < stream->metadata_out);
2957 if (stream->metadata_in != stream->metadata_out)
2958 goto end;
2959
2960 /* Metadata regenerated, change the version. */
2961 if (stream->metadata_cache->version != stream->version)
2962 stream->version = stream->metadata_cache->version;
2963
2964 len = stream->metadata_cache->metadata_written -
2965 stream->metadata_in;
2966 if (!len)
2967 goto end;
2968 reserve_len = min_t(size_t,
2969 stream->transport->ops.priv->packet_avail_size(chan),
2970 len);
2971 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
2972 sizeof(char), NULL);
2973 /*
2974 * If reservation failed, return an error to the caller.
2975 */
2976 ret = stream->transport->ops.event_reserve(&ctx);
2977 if (ret != 0) {
2978 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
2979 stream->coherent = false;
2980 goto end;
2981 }
2982 stream->transport->ops.event_write(&ctx,
2983 stream->metadata_cache->data + stream->metadata_in,
2984 reserve_len, 1);
2985 stream->transport->ops.event_commit(&ctx);
2986 stream->metadata_in += reserve_len;
2987 if (reserve_len < len)
2988 stream->coherent = false;
2989 else
2990 stream->coherent = true;
2991 ret = reserve_len;
2992
2993 end:
2994 if (coherent)
2995 *coherent = stream->coherent;
2996 mutex_unlock(&stream->metadata_cache->lock);
2997 return ret;
2998 }
2999
3000 static
3001 void lttng_metadata_begin(struct lttng_kernel_session *session)
3002 {
3003 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
3004 mutex_lock(&session->priv->metadata_cache->lock);
3005 }
3006
3007 static
3008 void lttng_metadata_end(struct lttng_kernel_session *session)
3009 {
3010 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3011 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3012 struct lttng_metadata_stream *stream;
3013
3014 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3015 wake_up_interruptible(&stream->read_wait);
3016 mutex_unlock(&session->priv->metadata_cache->lock);
3017 }
3018 }
3019
3020 /*
3021 * Write the metadata to the metadata cache.
3022 * Must be called with sessions_mutex held.
3023 * The metadata cache lock protects us from concurrent read access from
3024 * thread outputting metadata content to ring buffer.
3025 * The content of the printf is printed as a single atomic metadata
3026 * transaction.
3027 */
3028 int lttng_metadata_printf(struct lttng_kernel_session *session,
3029 const char *fmt, ...)
3030 {
3031 char *str;
3032 size_t len;
3033 va_list ap;
3034
3035 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
3036
3037 va_start(ap, fmt);
3038 str = kvasprintf(GFP_KERNEL, fmt, ap);
3039 va_end(ap);
3040 if (!str)
3041 return -ENOMEM;
3042
3043 len = strlen(str);
3044 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3045 if (session->priv->metadata_cache->metadata_written + len >
3046 session->priv->metadata_cache->cache_alloc) {
3047 char *tmp_cache_realloc;
3048 unsigned int tmp_cache_alloc_size;
3049
3050 tmp_cache_alloc_size = max_t(unsigned int,
3051 session->priv->metadata_cache->cache_alloc + len,
3052 session->priv->metadata_cache->cache_alloc << 1);
3053 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
3054 if (!tmp_cache_realloc)
3055 goto err;
3056 if (session->priv->metadata_cache->data) {
3057 memcpy(tmp_cache_realloc,
3058 session->priv->metadata_cache->data,
3059 session->priv->metadata_cache->cache_alloc);
3060 vfree(session->priv->metadata_cache->data);
3061 }
3062
3063 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3064 session->priv->metadata_cache->data = tmp_cache_realloc;
3065 }
3066 memcpy(session->priv->metadata_cache->data +
3067 session->priv->metadata_cache->metadata_written,
3068 str, len);
3069 session->priv->metadata_cache->metadata_written += len;
3070 kfree(str);
3071
3072 return 0;
3073
3074 err:
3075 kfree(str);
3076 return -ENOMEM;
3077 }
3078
3079 static
3080 int print_tabs(struct lttng_kernel_session *session, size_t nesting)
3081 {
3082 size_t i;
3083
3084 for (i = 0; i < nesting; i++) {
3085 int ret;
3086
3087 ret = lttng_metadata_printf(session, " ");
3088 if (ret) {
3089 return ret;
3090 }
3091 }
3092 return 0;
3093 }
3094
3095 static
3096 int lttng_field_name_statedump(struct lttng_kernel_session *session,
3097 const struct lttng_kernel_event_field *field,
3098 size_t nesting)
3099 {
3100 return lttng_metadata_printf(session, " _%s;\n", field->name);
3101 }
3102
3103 static
3104 int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
3105 const struct lttng_kernel_type_integer *type,
3106 enum lttng_kernel_string_encoding parent_encoding,
3107 size_t nesting)
3108 {
3109 int ret;
3110
3111 ret = print_tabs(session, nesting);
3112 if (ret)
3113 return ret;
3114 ret = lttng_metadata_printf(session,
3115 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3116 type->size,
3117 type->alignment,
3118 type->signedness,
3119 (parent_encoding == lttng_kernel_string_encoding_none)
3120 ? "none"
3121 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
3122 ? "UTF8"
3123 : "ASCII",
3124 type->base,
3125 #if __BYTE_ORDER == __BIG_ENDIAN
3126 type->reverse_byte_order ? " byte_order = le;" : ""
3127 #else
3128 type->reverse_byte_order ? " byte_order = be;" : ""
3129 #endif
3130 );
3131 return ret;
3132 }
3133
3134 /*
3135 * Must be called with sessions_mutex held.
3136 */
3137 static
3138 int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
3139 const struct lttng_kernel_type_struct *type,
3140 size_t nesting)
3141 {
3142 const char *prev_field_name = NULL;
3143 int ret;
3144 uint32_t i, nr_fields;
3145 unsigned int alignment;
3146
3147 ret = print_tabs(session, nesting);
3148 if (ret)
3149 return ret;
3150 ret = lttng_metadata_printf(session,
3151 "struct {\n");
3152 if (ret)
3153 return ret;
3154 nr_fields = type->nr_fields;
3155 for (i = 0; i < nr_fields; i++) {
3156 const struct lttng_kernel_event_field *iter_field;
3157
3158 iter_field = type->fields[i];
3159 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
3160 if (ret)
3161 return ret;
3162 }
3163 ret = print_tabs(session, nesting);
3164 if (ret)
3165 return ret;
3166 alignment = type->alignment;
3167 if (alignment) {
3168 ret = lttng_metadata_printf(session,
3169 "} align(%u)",
3170 alignment);
3171 } else {
3172 ret = lttng_metadata_printf(session,
3173 "}");
3174 }
3175 return ret;
3176 }
3177
3178 /*
3179 * Must be called with sessions_mutex held.
3180 */
3181 static
3182 int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
3183 const struct lttng_kernel_event_field *field,
3184 size_t nesting)
3185 {
3186 int ret;
3187
3188 ret = _lttng_struct_type_statedump(session,
3189 lttng_kernel_get_type_struct(field->type), nesting);
3190 if (ret)
3191 return ret;
3192 return lttng_field_name_statedump(session, field, nesting);
3193 }
3194
3195 /*
3196 * Must be called with sessions_mutex held.
3197 */
3198 static
3199 int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
3200 const struct lttng_kernel_type_variant *type,
3201 size_t nesting,
3202 const char *prev_field_name)
3203 {
3204 const char *tag_name;
3205 int ret;
3206 uint32_t i, nr_choices;
3207
3208 tag_name = type->tag_name;
3209 if (!tag_name)
3210 tag_name = prev_field_name;
3211 if (!tag_name)
3212 return -EINVAL;
3213 /*
3214 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3215 */
3216 if (type->alignment != 0)
3217 return -EINVAL;
3218 ret = print_tabs(session, nesting);
3219 if (ret)
3220 return ret;
3221 ret = lttng_metadata_printf(session,
3222 "variant <_%s> {\n",
3223 tag_name);
3224 if (ret)
3225 return ret;
3226 nr_choices = type->nr_choices;
3227 for (i = 0; i < nr_choices; i++) {
3228 const struct lttng_kernel_event_field *iter_field;
3229
3230 iter_field = type->choices[i];
3231 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
3232 if (ret)
3233 return ret;
3234 }
3235 ret = print_tabs(session, nesting);
3236 if (ret)
3237 return ret;
3238 ret = lttng_metadata_printf(session,
3239 "}");
3240 return ret;
3241 }
3242
3243 /*
3244 * Must be called with sessions_mutex held.
3245 */
3246 static
3247 int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
3248 const struct lttng_kernel_event_field *field,
3249 size_t nesting,
3250 const char *prev_field_name)
3251 {
3252 int ret;
3253
3254 ret = _lttng_variant_type_statedump(session,
3255 lttng_kernel_get_type_variant(field->type), nesting,
3256 prev_field_name);
3257 if (ret)
3258 return ret;
3259 return lttng_field_name_statedump(session, field, nesting);
3260 }
3261
3262 /*
3263 * Must be called with sessions_mutex held.
3264 */
3265 static
3266 int _lttng_array_field_statedump(struct lttng_kernel_session *session,
3267 const struct lttng_kernel_event_field *field,
3268 size_t nesting)
3269 {
3270 int ret;
3271 const struct lttng_kernel_type_array *array_type;
3272 const struct lttng_kernel_type_common *elem_type;
3273
3274 array_type = lttng_kernel_get_type_array(field->type);
3275 WARN_ON_ONCE(!array_type);
3276
3277 if (array_type->alignment) {
3278 ret = print_tabs(session, nesting);
3279 if (ret)
3280 return ret;
3281 ret = lttng_metadata_printf(session,
3282 "struct { } align(%u) _%s_padding;\n",
3283 array_type->alignment * CHAR_BIT,
3284 field->name);
3285 if (ret)
3286 return ret;
3287 }
3288 /*
3289 * Nested compound types: Only array of structures and variants are
3290 * currently supported.
3291 */
3292 elem_type = array_type->elem_type;
3293 switch (elem_type->type) {
3294 case lttng_kernel_type_integer:
3295 case lttng_kernel_type_struct:
3296 case lttng_kernel_type_variant:
3297 ret = _lttng_type_statedump(session, elem_type,
3298 array_type->encoding, nesting);
3299 if (ret)
3300 return ret;
3301 break;
3302
3303 default:
3304 return -EINVAL;
3305 }
3306 ret = lttng_metadata_printf(session,
3307 " _%s[%u];\n",
3308 field->name,
3309 array_type->length);
3310 return ret;
3311 }
3312
3313 /*
3314 * Must be called with sessions_mutex held.
3315 */
3316 static
3317 int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
3318 const struct lttng_kernel_event_field *field,
3319 size_t nesting,
3320 const char *prev_field_name)
3321 {
3322 int ret;
3323 const char *length_name;
3324 const struct lttng_kernel_type_sequence *sequence_type;
3325 const struct lttng_kernel_type_common *elem_type;
3326
3327 sequence_type = lttng_kernel_get_type_sequence(field->type);
3328 WARN_ON_ONCE(!sequence_type);
3329
3330 length_name = sequence_type->length_name;
3331 if (!length_name)
3332 length_name = prev_field_name;
3333 if (!length_name)
3334 return -EINVAL;
3335
3336 if (sequence_type->alignment) {
3337 ret = print_tabs(session, nesting);
3338 if (ret)
3339 return ret;
3340 ret = lttng_metadata_printf(session,
3341 "struct { } align(%u) _%s_padding;\n",
3342 sequence_type->alignment * CHAR_BIT,
3343 field->name);
3344 if (ret)
3345 return ret;
3346 }
3347
3348 /*
3349 * Nested compound types: Only array of structures and variants are
3350 * currently supported.
3351 */
3352 elem_type = sequence_type->elem_type;
3353 switch (elem_type->type) {
3354 case lttng_kernel_type_integer:
3355 case lttng_kernel_type_struct:
3356 case lttng_kernel_type_variant:
3357 ret = _lttng_type_statedump(session, elem_type,
3358 sequence_type->encoding, nesting);
3359 if (ret)
3360 return ret;
3361 break;
3362
3363 default:
3364 return -EINVAL;
3365 }
3366 ret = lttng_metadata_printf(session,
3367 " _%s[ _%s ];\n",
3368 field->name,
3369 length_name);
3370 return ret;
3371 }
3372
3373 /*
3374 * Must be called with sessions_mutex held.
3375 */
3376 static
3377 int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
3378 const struct lttng_kernel_type_enum *type,
3379 size_t nesting)
3380 {
3381 const struct lttng_kernel_enum_desc *enum_desc;
3382 const struct lttng_kernel_type_common *container_type;
3383 int ret;
3384 unsigned int i, nr_entries;
3385
3386 container_type = type->container_type;
3387 if (container_type->type != lttng_kernel_type_integer) {
3388 ret = -EINVAL;
3389 goto end;
3390 }
3391 enum_desc = type->desc;
3392 nr_entries = enum_desc->nr_entries;
3393
3394 ret = print_tabs(session, nesting);
3395 if (ret)
3396 goto end;
3397 ret = lttng_metadata_printf(session, "enum : ");
3398 if (ret)
3399 goto end;
3400 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3401 lttng_kernel_string_encoding_none, 0);
3402 if (ret)
3403 goto end;
3404 ret = lttng_metadata_printf(session, " {\n");
3405 if (ret)
3406 goto end;
3407 /* Dump all entries */
3408 for (i = 0; i < nr_entries; i++) {
3409 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
3410 int j, len;
3411
3412 ret = print_tabs(session, nesting + 1);
3413 if (ret)
3414 goto end;
3415 ret = lttng_metadata_printf(session,
3416 "\"");
3417 if (ret)
3418 goto end;
3419 len = strlen(entry->string);
3420 /* Escape the character '"' */
3421 for (j = 0; j < len; j++) {
3422 char c = entry->string[j];
3423
3424 switch (c) {
3425 case '"':
3426 ret = lttng_metadata_printf(session,
3427 "\\\"");
3428 break;
3429 case '\\':
3430 ret = lttng_metadata_printf(session,
3431 "\\\\");
3432 break;
3433 default:
3434 ret = lttng_metadata_printf(session,
3435 "%c", c);
3436 break;
3437 }
3438 if (ret)
3439 goto end;
3440 }
3441 ret = lttng_metadata_printf(session, "\"");
3442 if (ret)
3443 goto end;
3444
3445 if (entry->options.is_auto) {
3446 ret = lttng_metadata_printf(session, ",\n");
3447 if (ret)
3448 goto end;
3449 } else {
3450 ret = lttng_metadata_printf(session,
3451 " = ");
3452 if (ret)
3453 goto end;
3454 if (entry->start.signedness)
3455 ret = lttng_metadata_printf(session,
3456 "%lld", (long long) entry->start.value);
3457 else
3458 ret = lttng_metadata_printf(session,
3459 "%llu", entry->start.value);
3460 if (ret)
3461 goto end;
3462 if (entry->start.signedness == entry->end.signedness &&
3463 entry->start.value
3464 == entry->end.value) {
3465 ret = lttng_metadata_printf(session,
3466 ",\n");
3467 } else {
3468 if (entry->end.signedness) {
3469 ret = lttng_metadata_printf(session,
3470 " ... %lld,\n",
3471 (long long) entry->end.value);
3472 } else {
3473 ret = lttng_metadata_printf(session,
3474 " ... %llu,\n",
3475 entry->end.value);
3476 }
3477 }
3478 if (ret)
3479 goto end;
3480 }
3481 }
3482 ret = print_tabs(session, nesting);
3483 if (ret)
3484 goto end;
3485 ret = lttng_metadata_printf(session, "}");
3486 end:
3487 return ret;
3488 }
3489
3490 /*
3491 * Must be called with sessions_mutex held.
3492 */
3493 static
3494 int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
3495 const struct lttng_kernel_event_field *field,
3496 size_t nesting)
3497 {
3498 int ret;
3499 const struct lttng_kernel_type_enum *enum_type;
3500
3501 enum_type = lttng_kernel_get_type_enum(field->type);
3502 WARN_ON_ONCE(!enum_type);
3503 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
3504 if (ret)
3505 return ret;
3506 return lttng_field_name_statedump(session, field, nesting);
3507 }
3508
3509 static
3510 int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
3511 const struct lttng_kernel_event_field *field,
3512 size_t nesting)
3513 {
3514 int ret;
3515
3516 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3517 lttng_kernel_string_encoding_none, nesting);
3518 if (ret)
3519 return ret;
3520 return lttng_field_name_statedump(session, field, nesting);
3521 }
3522
3523 static
3524 int _lttng_string_type_statedump(struct lttng_kernel_session *session,
3525 const struct lttng_kernel_type_string *type,
3526 size_t nesting)
3527 {
3528 int ret;
3529
3530 /* Default encoding is UTF8 */
3531 ret = print_tabs(session, nesting);
3532 if (ret)
3533 return ret;
3534 ret = lttng_metadata_printf(session,
3535 "string%s",
3536 type->encoding == lttng_kernel_string_encoding_ASCII ?
3537 " { encoding = ASCII; }" : "");
3538 return ret;
3539 }
3540
3541 static
3542 int _lttng_string_field_statedump(struct lttng_kernel_session *session,
3543 const struct lttng_kernel_event_field *field,
3544 size_t nesting)
3545 {
3546 const struct lttng_kernel_type_string *string_type;
3547 int ret;
3548
3549 string_type = lttng_kernel_get_type_string(field->type);
3550 WARN_ON_ONCE(!string_type);
3551 ret = _lttng_string_type_statedump(session, string_type, nesting);
3552 if (ret)
3553 return ret;
3554 return lttng_field_name_statedump(session, field, nesting);
3555 }
3556
3557 /*
3558 * Must be called with sessions_mutex held.
3559 */
3560 static
3561 int _lttng_type_statedump(struct lttng_kernel_session *session,
3562 const struct lttng_kernel_type_common *type,
3563 enum lttng_kernel_string_encoding parent_encoding,
3564 size_t nesting)
3565 {
3566 int ret = 0;
3567
3568 switch (type->type) {
3569 case lttng_kernel_type_integer:
3570 ret = _lttng_integer_type_statedump(session,
3571 lttng_kernel_get_type_integer(type),
3572 parent_encoding, nesting);
3573 break;
3574 case lttng_kernel_type_enum:
3575 ret = _lttng_enum_type_statedump(session,
3576 lttng_kernel_get_type_enum(type),
3577 nesting);
3578 break;
3579 case lttng_kernel_type_string:
3580 ret = _lttng_string_type_statedump(session,
3581 lttng_kernel_get_type_string(type),
3582 nesting);
3583 break;
3584 case lttng_kernel_type_struct:
3585 ret = _lttng_struct_type_statedump(session,
3586 lttng_kernel_get_type_struct(type),
3587 nesting);
3588 break;
3589 case lttng_kernel_type_variant:
3590 ret = _lttng_variant_type_statedump(session,
3591 lttng_kernel_get_type_variant(type),
3592 nesting, NULL);
3593 break;
3594
3595 /* Nested arrays and sequences are not supported yet. */
3596 case lttng_kernel_type_array:
3597 case lttng_kernel_type_sequence:
3598 default:
3599 WARN_ON_ONCE(1);
3600 return -EINVAL;
3601 }
3602 return ret;
3603 }
3604
3605 /*
3606 * Must be called with sessions_mutex held.
3607 */
3608 static
3609 int _lttng_field_statedump(struct lttng_kernel_session *session,
3610 const struct lttng_kernel_event_field *field,
3611 size_t nesting,
3612 const char **prev_field_name_p)
3613 {
3614 const char *prev_field_name = NULL;
3615 int ret = 0;
3616
3617 if (prev_field_name_p)
3618 prev_field_name = *prev_field_name_p;
3619 switch (field->type->type) {
3620 case lttng_kernel_type_integer:
3621 ret = _lttng_integer_field_statedump(session, field, nesting);
3622 break;
3623 case lttng_kernel_type_enum:
3624 ret = _lttng_enum_field_statedump(session, field, nesting);
3625 break;
3626 case lttng_kernel_type_string:
3627 ret = _lttng_string_field_statedump(session, field, nesting);
3628 break;
3629 case lttng_kernel_type_struct:
3630 ret = _lttng_struct_field_statedump(session, field, nesting);
3631 break;
3632 case lttng_kernel_type_array:
3633 ret = _lttng_array_field_statedump(session, field, nesting);
3634 break;
3635 case lttng_kernel_type_sequence:
3636 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
3637 break;
3638 case lttng_kernel_type_variant:
3639 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
3640 break;
3641
3642 default:
3643 WARN_ON_ONCE(1);
3644 return -EINVAL;
3645 }
3646 if (prev_field_name_p)
3647 *prev_field_name_p = field->name;
3648 return ret;
3649 }
3650
3651 static
3652 int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
3653 struct lttng_kernel_ctx *ctx)
3654 {
3655 const char *prev_field_name = NULL;
3656 int ret = 0;
3657 int i;
3658
3659 if (!ctx)
3660 return 0;
3661 for (i = 0; i < ctx->nr_fields; i++) {
3662 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
3663
3664 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
3665 if (ret)
3666 return ret;
3667 }
3668 return ret;
3669 }
3670
3671 static
3672 int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
3673 struct lttng_kernel_event_recorder *event_recorder)
3674 {
3675 const char *prev_field_name = NULL;
3676 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
3677 int ret = 0;
3678 int i;
3679
3680 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3681 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
3682
3683 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
3684 if (ret)
3685 return ret;
3686 }
3687 return ret;
3688 }
3689
3690 /*
3691 * Must be called with sessions_mutex held.
3692 * The entire event metadata is printed as a single atomic metadata
3693 * transaction.
3694 */
3695 static
3696 int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
3697 struct lttng_kernel_channel_buffer *chan,
3698 struct lttng_kernel_event_recorder *event_recorder)
3699 {
3700 int ret = 0;
3701
3702 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3703 return 0;
3704 if (chan->priv->channel_type == METADATA_CHANNEL)
3705 return 0;
3706
3707 lttng_metadata_begin(session);
3708
3709 ret = lttng_metadata_printf(session,
3710 "event {\n"
3711 " name = \"%s\";\n"
3712 " id = %u;\n"
3713 " stream_id = %u;\n",
3714 event_recorder->priv->parent.desc->event_name,
3715 event_recorder->priv->id,
3716 event_recorder->chan->priv->id);
3717 if (ret)
3718 goto end;
3719
3720 ret = lttng_metadata_printf(session,
3721 " fields := struct {\n"
3722 );
3723 if (ret)
3724 goto end;
3725
3726 ret = _lttng_fields_metadata_statedump(session, event_recorder);
3727 if (ret)
3728 goto end;
3729
3730 /*
3731 * LTTng space reservation can only reserve multiples of the
3732 * byte size.
3733 */
3734 ret = lttng_metadata_printf(session,
3735 " };\n"
3736 "};\n\n");
3737 if (ret)
3738 goto end;
3739
3740 event_recorder->priv->metadata_dumped = 1;
3741 end:
3742 lttng_metadata_end(session);
3743 return ret;
3744
3745 }
3746
3747 /*
3748 * Must be called with sessions_mutex held.
3749 * The entire channel metadata is printed as a single atomic metadata
3750 * transaction.
3751 */
3752 static
3753 int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
3754 struct lttng_kernel_channel_buffer *chan)
3755 {
3756 int ret = 0;
3757
3758 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3759 return 0;
3760
3761 if (chan->priv->channel_type == METADATA_CHANNEL)
3762 return 0;
3763
3764 lttng_metadata_begin(session);
3765
3766 WARN_ON_ONCE(!chan->priv->header_type);
3767 ret = lttng_metadata_printf(session,
3768 "stream {\n"
3769 " id = %u;\n"
3770 " event.header := %s;\n"
3771 " packet.context := struct packet_context;\n",
3772 chan->priv->id,
3773 chan->priv->header_type == 1 ? "struct event_header_compact" :
3774 "struct event_header_large");
3775 if (ret)
3776 goto end;
3777
3778 if (chan->priv->ctx) {
3779 ret = lttng_metadata_printf(session,
3780 " event.context := struct {\n");
3781 if (ret)
3782 goto end;
3783 }
3784 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
3785 if (ret)
3786 goto end;
3787 if (chan->priv->ctx) {
3788 ret = lttng_metadata_printf(session,
3789 " };\n");
3790 if (ret)
3791 goto end;
3792 }
3793
3794 ret = lttng_metadata_printf(session,
3795 "};\n\n");
3796
3797 chan->priv->metadata_dumped = 1;
3798 end:
3799 lttng_metadata_end(session);
3800 return ret;
3801 }
3802
3803 /*
3804 * Must be called with sessions_mutex held.
3805 */
3806 static
3807 int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
3808 {
3809 return lttng_metadata_printf(session,
3810 "struct packet_context {\n"
3811 " uint64_clock_monotonic_t timestamp_begin;\n"
3812 " uint64_clock_monotonic_t timestamp_end;\n"
3813 " uint64_t content_size;\n"
3814 " uint64_t packet_size;\n"
3815 " uint64_t packet_seq_num;\n"
3816 " unsigned long events_discarded;\n"
3817 " uint32_t cpu_id;\n"
3818 "};\n\n"
3819 );
3820 }
3821
3822 /*
3823 * Compact header:
3824 * id: range: 0 - 30.
3825 * id 31 is reserved to indicate an extended header.
3826 *
3827 * Large header:
3828 * id: range: 0 - 65534.
3829 * id 65535 is reserved to indicate an extended header.
3830 *
3831 * Must be called with sessions_mutex held.
3832 */
3833 static
3834 int _lttng_event_header_declare(struct lttng_kernel_session *session)
3835 {
3836 return lttng_metadata_printf(session,
3837 "struct event_header_compact {\n"
3838 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3839 " variant <id> {\n"
3840 " struct {\n"
3841 " uint27_clock_monotonic_t timestamp;\n"
3842 " } compact;\n"
3843 " struct {\n"
3844 " uint32_t id;\n"
3845 " uint64_clock_monotonic_t timestamp;\n"
3846 " } extended;\n"
3847 " } v;\n"
3848 "} align(%u);\n"
3849 "\n"
3850 "struct event_header_large {\n"
3851 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3852 " variant <id> {\n"
3853 " struct {\n"
3854 " uint32_clock_monotonic_t timestamp;\n"
3855 " } compact;\n"
3856 " struct {\n"
3857 " uint32_t id;\n"
3858 " uint64_clock_monotonic_t timestamp;\n"
3859 " } extended;\n"
3860 " } v;\n"
3861 "} align(%u);\n\n",
3862 lttng_alignof(uint32_t) * CHAR_BIT,
3863 lttng_alignof(uint16_t) * CHAR_BIT
3864 );
3865 }
3866
3867 /*
3868 * Approximation of NTP time of day to clock monotonic correlation,
3869 * taken at start of trace.
3870 * Yes, this is only an approximation. Yes, we can (and will) do better
3871 * in future versions.
3872 * This function may return a negative offset. It may happen if the
3873 * system sets the REALTIME clock to 0 after boot.
3874 *
3875 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3876 * y2038 compliant.
3877 */
3878 static
3879 int64_t measure_clock_offset(void)
3880 {
3881 uint64_t monotonic_avg, monotonic[2], realtime;
3882 uint64_t tcf = trace_clock_freq();
3883 int64_t offset;
3884 unsigned long flags;
3885 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3886 struct timespec64 rts = { 0, 0 };
3887 #else
3888 struct timespec rts = { 0, 0 };
3889 #endif
3890
3891 /* Disable interrupts to increase correlation precision. */
3892 local_irq_save(flags);
3893 monotonic[0] = trace_clock_read64();
3894 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3895 ktime_get_real_ts64(&rts);
3896 #else
3897 getnstimeofday(&rts);
3898 #endif
3899 monotonic[1] = trace_clock_read64();
3900 local_irq_restore(flags);
3901
3902 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
3903 realtime = (uint64_t) rts.tv_sec * tcf;
3904 if (tcf == NSEC_PER_SEC) {
3905 realtime += rts.tv_nsec;
3906 } else {
3907 uint64_t n = rts.tv_nsec * tcf;
3908
3909 do_div(n, NSEC_PER_SEC);
3910 realtime += n;
3911 }
3912 offset = (int64_t) realtime - monotonic_avg;
3913 return offset;
3914 }
3915
3916 static
3917 int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3918 {
3919 int ret = 0;
3920 size_t i;
3921 char cur;
3922
3923 i = 0;
3924 cur = string[i];
3925 while (cur != '\0') {
3926 switch (cur) {
3927 case '\n':
3928 ret = lttng_metadata_printf(session, "%s", "\\n");
3929 break;
3930 case '\\':
3931 case '"':
3932 ret = lttng_metadata_printf(session, "%c", '\\');
3933 if (ret)
3934 goto error;
3935 /* We still print the current char */
3936 lttng_fallthrough;
3937 default:
3938 ret = lttng_metadata_printf(session, "%c", cur);
3939 break;
3940 }
3941
3942 if (ret)
3943 goto error;
3944
3945 cur = string[++i];
3946 }
3947 error:
3948 return ret;
3949 }
3950
3951 static
3952 int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
3953 const char *field_value)
3954 {
3955 int ret;
3956
3957 ret = lttng_metadata_printf(session, " %s = \"", field);
3958 if (ret)
3959 goto error;
3960
3961 ret = print_escaped_ctf_string(session, field_value);
3962 if (ret)
3963 goto error;
3964
3965 ret = lttng_metadata_printf(session, "\";\n");
3966
3967 error:
3968 return ret;
3969 }
3970
3971 /*
3972 * Output metadata into this session's metadata buffers.
3973 * Must be called with sessions_mutex held.
3974 */
3975 static
3976 int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
3977 {
3978 unsigned char *uuid_c = session->priv->uuid.b;
3979 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
3980 const char *product_uuid;
3981 struct lttng_kernel_channel_buffer_private *chan_priv;
3982 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3983 int ret = 0;
3984
3985 if (!LTTNG_READ_ONCE(session->active))
3986 return 0;
3987
3988 lttng_metadata_begin(session);
3989
3990 if (session->priv->metadata_dumped)
3991 goto skip_session;
3992
3993 snprintf(uuid_s, sizeof(uuid_s),
3994 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3995 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3996 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3997 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3998 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
3999
4000 ret = lttng_metadata_printf(session,
4001 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4002 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4003 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4004 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4005 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4006 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4007 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4008 "\n"
4009 "trace {\n"
4010 " major = %u;\n"
4011 " minor = %u;\n"
4012 " uuid = \"%s\";\n"
4013 " byte_order = %s;\n"
4014 " packet.header := struct {\n"
4015 " uint32_t magic;\n"
4016 " uint8_t uuid[16];\n"
4017 " uint32_t stream_id;\n"
4018 " uint64_t stream_instance_id;\n"
4019 " };\n"
4020 "};\n\n",
4021 lttng_alignof(uint8_t) * CHAR_BIT,
4022 lttng_alignof(uint16_t) * CHAR_BIT,
4023 lttng_alignof(uint32_t) * CHAR_BIT,
4024 lttng_alignof(uint64_t) * CHAR_BIT,
4025 sizeof(unsigned long) * CHAR_BIT,
4026 lttng_alignof(unsigned long) * CHAR_BIT,
4027 CTF_SPEC_MAJOR,
4028 CTF_SPEC_MINOR,
4029 uuid_s,
4030 #if __BYTE_ORDER == __BIG_ENDIAN
4031 "be"
4032 #else
4033 "le"
4034 #endif
4035 );
4036 if (ret)
4037 goto end;
4038
4039 ret = lttng_metadata_printf(session,
4040 "env {\n"
4041 " hostname = \"%s\";\n"
4042 " domain = \"kernel\";\n"
4043 " sysname = \"%s\";\n"
4044 " kernel_release = \"%s\";\n"
4045 " kernel_version = \"%s\";\n"
4046 " tracer_name = \"lttng-modules\";\n"
4047 " tracer_major = %d;\n"
4048 " tracer_minor = %d;\n"
4049 " tracer_patchlevel = %d;\n"
4050 " trace_buffering_scheme = \"global\";\n",
4051 current->nsproxy->uts_ns->name.nodename,
4052 utsname()->sysname,
4053 utsname()->release,
4054 utsname()->version,
4055 LTTNG_MODULES_MAJOR_VERSION,
4056 LTTNG_MODULES_MINOR_VERSION,
4057 LTTNG_MODULES_PATCHLEVEL_VERSION
4058 );
4059 if (ret)
4060 goto end;
4061
4062 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
4063 if (ret)
4064 goto end;
4065 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
4066 session->priv->creation_time);
4067 if (ret)
4068 goto end;
4069
4070 /* Add the product UUID to the 'env' section */
4071 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4072 if (product_uuid) {
4073 ret = lttng_metadata_printf(session,
4074 " product_uuid = \"%s\";\n",
4075 product_uuid
4076 );
4077 if (ret)
4078 goto end;
4079 }
4080
4081 /* Close the 'env' section */
4082 ret = lttng_metadata_printf(session, "};\n\n");
4083 if (ret)
4084 goto end;
4085
4086 ret = lttng_metadata_printf(session,
4087 "clock {\n"
4088 " name = \"%s\";\n",
4089 trace_clock_name()
4090 );
4091 if (ret)
4092 goto end;
4093
4094 if (!trace_clock_uuid(clock_uuid_s)) {
4095 ret = lttng_metadata_printf(session,
4096 " uuid = \"%s\";\n",
4097 clock_uuid_s
4098 );
4099 if (ret)
4100 goto end;
4101 }
4102
4103 ret = lttng_metadata_printf(session,
4104 " description = \"%s\";\n"
4105 " freq = %llu; /* Frequency, in Hz */\n"
4106 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4107 " offset = %lld;\n"
4108 "};\n\n",
4109 trace_clock_description(),
4110 (unsigned long long) trace_clock_freq(),
4111 (long long) measure_clock_offset()
4112 );
4113 if (ret)
4114 goto end;
4115
4116 ret = lttng_metadata_printf(session,
4117 "typealias integer {\n"
4118 " size = 27; align = 1; signed = false;\n"
4119 " map = clock.%s.value;\n"
4120 "} := uint27_clock_monotonic_t;\n"
4121 "\n"
4122 "typealias integer {\n"
4123 " size = 32; align = %u; signed = false;\n"
4124 " map = clock.%s.value;\n"
4125 "} := uint32_clock_monotonic_t;\n"
4126 "\n"
4127 "typealias integer {\n"
4128 " size = 64; align = %u; signed = false;\n"
4129 " map = clock.%s.value;\n"
4130 "} := uint64_clock_monotonic_t;\n\n",
4131 trace_clock_name(),
4132 lttng_alignof(uint32_t) * CHAR_BIT,
4133 trace_clock_name(),
4134 lttng_alignof(uint64_t) * CHAR_BIT,
4135 trace_clock_name()
4136 );
4137 if (ret)
4138 goto end;
4139
4140 ret = _lttng_stream_packet_context_declare(session);
4141 if (ret)
4142 goto end;
4143
4144 ret = _lttng_event_header_declare(session);
4145 if (ret)
4146 goto end;
4147
4148 skip_session:
4149 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4150 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
4151 if (ret)
4152 goto end;
4153 }
4154
4155 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
4156 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4157 event_recorder_priv->pub);
4158 if (ret)
4159 goto end;
4160 }
4161 session->priv->metadata_dumped = 1;
4162 end:
4163 lttng_metadata_end(session);
4164 return ret;
4165 }
4166
4167 /**
4168 * lttng_transport_register - LTT transport registration
4169 * @transport: transport structure
4170 *
4171 * Registers a transport which can be used as output to extract the data out of
4172 * LTTng. The module calling this registration function must ensure that no
4173 * trap-inducing code will be executed by the transport functions. E.g.
4174 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4175 * is made visible to the transport function. This registration acts as a
4176 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4177 * after its registration must it synchronize the TLBs.
4178 */
4179 void lttng_transport_register(struct lttng_transport *transport)
4180 {
4181 /*
4182 * Make sure no page fault can be triggered by the module about to be
4183 * registered. We deal with this here so we don't have to call
4184 * vmalloc_sync_mappings() in each module's init.
4185 */
4186 wrapper_vmalloc_sync_mappings();
4187
4188 mutex_lock(&sessions_mutex);
4189 list_add_tail(&transport->node, &lttng_transport_list);
4190 mutex_unlock(&sessions_mutex);
4191 }
4192 EXPORT_SYMBOL_GPL(lttng_transport_register);
4193
4194 /**
4195 * lttng_transport_unregister - LTT transport unregistration
4196 * @transport: transport structure
4197 */
4198 void lttng_transport_unregister(struct lttng_transport *transport)
4199 {
4200 mutex_lock(&sessions_mutex);
4201 list_del(&transport->node);
4202 mutex_unlock(&sessions_mutex);
4203 }
4204 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
4205
4206 void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4207 {
4208 /*
4209 * Make sure no page fault can be triggered by the module about to be
4210 * registered. We deal with this here so we don't have to call
4211 * vmalloc_sync_mappings() in each module's init.
4212 */
4213 wrapper_vmalloc_sync_mappings();
4214
4215 mutex_lock(&sessions_mutex);
4216 list_add_tail(&transport->node, &lttng_counter_transport_list);
4217 mutex_unlock(&sessions_mutex);
4218 }
4219 EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4220
4221 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4222 {
4223 mutex_lock(&sessions_mutex);
4224 list_del(&transport->node);
4225 mutex_unlock(&sessions_mutex);
4226 }
4227 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4228
4229 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4230
4231 enum cpuhp_state lttng_hp_prepare;
4232 enum cpuhp_state lttng_hp_online;
4233
4234 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4235 {
4236 struct lttng_cpuhp_node *lttng_node;
4237
4238 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4239 switch (lttng_node->component) {
4240 case LTTNG_RING_BUFFER_FRONTEND:
4241 return 0;
4242 case LTTNG_RING_BUFFER_BACKEND:
4243 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4244 case LTTNG_RING_BUFFER_ITER:
4245 return 0;
4246 case LTTNG_CONTEXT_PERF_COUNTERS:
4247 return 0;
4248 default:
4249 return -EINVAL;
4250 }
4251 }
4252
4253 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4254 {
4255 struct lttng_cpuhp_node *lttng_node;
4256
4257 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4258 switch (lttng_node->component) {
4259 case LTTNG_RING_BUFFER_FRONTEND:
4260 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4261 case LTTNG_RING_BUFFER_BACKEND:
4262 return 0;
4263 case LTTNG_RING_BUFFER_ITER:
4264 return 0;
4265 case LTTNG_CONTEXT_PERF_COUNTERS:
4266 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4267 default:
4268 return -EINVAL;
4269 }
4270 }
4271
4272 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4273 {
4274 struct lttng_cpuhp_node *lttng_node;
4275
4276 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4277 switch (lttng_node->component) {
4278 case LTTNG_RING_BUFFER_FRONTEND:
4279 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4280 case LTTNG_RING_BUFFER_BACKEND:
4281 return 0;
4282 case LTTNG_RING_BUFFER_ITER:
4283 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4284 case LTTNG_CONTEXT_PERF_COUNTERS:
4285 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4286 default:
4287 return -EINVAL;
4288 }
4289 }
4290
4291 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4292 {
4293 struct lttng_cpuhp_node *lttng_node;
4294
4295 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4296 switch (lttng_node->component) {
4297 case LTTNG_RING_BUFFER_FRONTEND:
4298 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4299 case LTTNG_RING_BUFFER_BACKEND:
4300 return 0;
4301 case LTTNG_RING_BUFFER_ITER:
4302 return 0;
4303 case LTTNG_CONTEXT_PERF_COUNTERS:
4304 return 0;
4305 default:
4306 return -EINVAL;
4307 }
4308 }
4309
4310 static int __init lttng_init_cpu_hotplug(void)
4311 {
4312 int ret;
4313
4314 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4315 lttng_hotplug_prepare,
4316 lttng_hotplug_dead);
4317 if (ret < 0) {
4318 return ret;
4319 }
4320 lttng_hp_prepare = ret;
4321 lttng_rb_set_hp_prepare(ret);
4322
4323 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4324 lttng_hotplug_online,
4325 lttng_hotplug_offline);
4326 if (ret < 0) {
4327 cpuhp_remove_multi_state(lttng_hp_prepare);
4328 lttng_hp_prepare = 0;
4329 return ret;
4330 }
4331 lttng_hp_online = ret;
4332 lttng_rb_set_hp_online(ret);
4333
4334 return 0;
4335 }
4336
4337 static void __exit lttng_exit_cpu_hotplug(void)
4338 {
4339 lttng_rb_set_hp_online(0);
4340 cpuhp_remove_multi_state(lttng_hp_online);
4341 lttng_rb_set_hp_prepare(0);
4342 cpuhp_remove_multi_state(lttng_hp_prepare);
4343 }
4344
4345 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4346 static int lttng_init_cpu_hotplug(void)
4347 {
4348 return 0;
4349 }
4350 static void lttng_exit_cpu_hotplug(void)
4351 {
4352 }
4353 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4354
4355 static int __init lttng_events_init(void)
4356 {
4357 int ret;
4358
4359 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4360 if (ret)
4361 return ret;
4362 ret = wrapper_get_pfnblock_flags_mask_init();
4363 if (ret)
4364 return ret;
4365 ret = wrapper_get_pageblock_flags_mask_init();
4366 if (ret)
4367 return ret;
4368 ret = lttng_probes_init();
4369 if (ret)
4370 return ret;
4371 ret = lttng_context_init();
4372 if (ret)
4373 return ret;
4374 ret = lttng_tracepoint_init();
4375 if (ret)
4376 goto error_tp;
4377 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4378 if (!event_recorder_cache) {
4379 ret = -ENOMEM;
4380 goto error_kmem_event_recorder;
4381 }
4382 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4383 if (!event_recorder_private_cache) {
4384 ret = -ENOMEM;
4385 goto error_kmem_event_recorder_private;
4386 }
4387 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
4388 if (!event_notifier_cache) {
4389 ret = -ENOMEM;
4390 goto error_kmem_event_notifier;
4391 }
4392 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4393 if (!event_notifier_private_cache) {
4394 ret = -ENOMEM;
4395 goto error_kmem_event_notifier_private;
4396 }
4397 ret = lttng_abi_init();
4398 if (ret)
4399 goto error_abi;
4400 ret = lttng_logger_init();
4401 if (ret)
4402 goto error_logger;
4403 ret = lttng_init_cpu_hotplug();
4404 if (ret)
4405 goto error_hotplug;
4406 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4407 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4408 __stringify(LTTNG_MODULES_MINOR_VERSION),
4409 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4410 LTTNG_MODULES_EXTRAVERSION,
4411 LTTNG_VERSION_NAME,
4412 #ifdef LTTNG_EXTRA_VERSION_GIT
4413 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4414 #else
4415 "",
4416 #endif
4417 #ifdef LTTNG_EXTRA_VERSION_NAME
4418 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4419 #else
4420 "");
4421 #endif
4422 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4423 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4424 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4425 return 0;
4426
4427 error_hotplug:
4428 lttng_logger_exit();
4429 error_logger:
4430 lttng_abi_exit();
4431 error_abi:
4432 kmem_cache_destroy(event_notifier_private_cache);
4433 error_kmem_event_notifier_private:
4434 kmem_cache_destroy(event_notifier_cache);
4435 error_kmem_event_notifier:
4436 kmem_cache_destroy(event_recorder_private_cache);
4437 error_kmem_event_recorder_private:
4438 kmem_cache_destroy(event_recorder_cache);
4439 error_kmem_event_recorder:
4440 lttng_tracepoint_exit();
4441 error_tp:
4442 lttng_context_exit();
4443 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4444 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4445 __stringify(LTTNG_MODULES_MINOR_VERSION),
4446 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4447 LTTNG_MODULES_EXTRAVERSION,
4448 LTTNG_VERSION_NAME,
4449 #ifdef LTTNG_EXTRA_VERSION_GIT
4450 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4451 #else
4452 "",
4453 #endif
4454 #ifdef LTTNG_EXTRA_VERSION_NAME
4455 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4456 #else
4457 "");
4458 #endif
4459 return ret;
4460 }
4461
4462 module_init(lttng_events_init);
4463
4464 static void __exit lttng_events_exit(void)
4465 {
4466 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
4467
4468 lttng_exit_cpu_hotplug();
4469 lttng_logger_exit();
4470 lttng_abi_exit();
4471 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4472 lttng_session_destroy(session_priv->pub);
4473 kmem_cache_destroy(event_recorder_cache);
4474 kmem_cache_destroy(event_recorder_private_cache);
4475 kmem_cache_destroy(event_notifier_cache);
4476 kmem_cache_destroy(event_notifier_private_cache);
4477 lttng_tracepoint_exit();
4478 lttng_context_exit();
4479 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4480 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4481 __stringify(LTTNG_MODULES_MINOR_VERSION),
4482 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4483 LTTNG_MODULES_EXTRAVERSION,
4484 LTTNG_VERSION_NAME,
4485 #ifdef LTTNG_EXTRA_VERSION_GIT
4486 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4487 #else
4488 "",
4489 #endif
4490 #ifdef LTTNG_EXTRA_VERSION_NAME
4491 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4492 #else
4493 "");
4494 #endif
4495 }
4496
4497 module_exit(lttng_events_exit);
4498
4499 #include <generated/patches.h>
4500 #ifdef LTTNG_EXTRA_VERSION_GIT
4501 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4502 #endif
4503 #ifdef LTTNG_EXTRA_VERSION_NAME
4504 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4505 #endif
4506 MODULE_LICENSE("GPL and additional rights");
4507 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4508 MODULE_DESCRIPTION("LTTng tracer");
4509 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4510 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
4511 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4512 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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