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