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