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647c7827e45241d42dd466cf7c07ecd5b65bc897
[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_recorder_unregister(struct lttng_kernel_event_recorder *event);
75 static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier);
76 static
77 int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
78 struct lttng_kernel_channel_buffer *chan,
79 struct lttng_kernel_event_recorder *event);
80 static
81 int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
82 static
83 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
84 static
85 int _lttng_type_statedump(struct lttng_kernel_session *session,
86 const struct lttng_kernel_type_common *type,
87 enum lttng_kernel_string_encoding parent_encoding,
88 size_t nesting);
89 static
90 int _lttng_field_statedump(struct lttng_kernel_session *session,
91 const struct lttng_kernel_event_field *field,
92 size_t nesting, const char **prev_field_name_p);
93
94 void synchronize_trace(void)
95 {
96 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
97 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
98 synchronize_rcu();
99 #else
100 synchronize_sched();
101 #endif
102
103 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
104 #ifdef CONFIG_PREEMPT_RT_FULL
105 synchronize_rcu();
106 #endif
107 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
108 #ifdef CONFIG_PREEMPT_RT
109 synchronize_rcu();
110 #endif
111 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
112 }
113
114 void lttng_lock_sessions(void)
115 {
116 mutex_lock(&sessions_mutex);
117 }
118
119 void lttng_unlock_sessions(void)
120 {
121 mutex_unlock(&sessions_mutex);
122 }
123
124 static struct lttng_transport *lttng_transport_find(const char *name)
125 {
126 struct lttng_transport *transport;
127
128 list_for_each_entry(transport, &lttng_transport_list, node) {
129 if (!strcmp(transport->name, name))
130 return transport;
131 }
132 return NULL;
133 }
134
135 /*
136 * Called with sessions lock held.
137 */
138 int lttng_session_active(void)
139 {
140 struct lttng_kernel_session_private *iter;
141
142 list_for_each_entry(iter, &sessions, list) {
143 if (iter->pub->active)
144 return 1;
145 }
146 return 0;
147 }
148
149 struct lttng_kernel_session *lttng_session_create(void)
150 {
151 struct lttng_kernel_session *session;
152 struct lttng_kernel_session_private *session_priv;
153 struct lttng_metadata_cache *metadata_cache;
154 int i;
155
156 mutex_lock(&sessions_mutex);
157 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
158 if (!session)
159 goto err;
160 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
161 if (!session_priv)
162 goto err_free_session;
163 session->priv = session_priv;
164 session_priv->pub = session;
165
166 INIT_LIST_HEAD(&session_priv->chan);
167 INIT_LIST_HEAD(&session_priv->events);
168 lttng_guid_gen(&session_priv->uuid);
169
170 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
171 GFP_KERNEL);
172 if (!metadata_cache)
173 goto err_free_session_private;
174 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
175 if (!metadata_cache->data)
176 goto err_free_cache;
177 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
178 kref_init(&metadata_cache->refcount);
179 mutex_init(&metadata_cache->lock);
180 session_priv->metadata_cache = metadata_cache;
181 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
182 memcpy(&metadata_cache->uuid, &session_priv->uuid,
183 sizeof(metadata_cache->uuid));
184 INIT_LIST_HEAD(&session_priv->enablers_head);
185 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
186 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
187 list_add(&session_priv->list, &sessions);
188
189 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
190 goto tracker_alloc_error;
191 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
192 goto tracker_alloc_error;
193 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
194 goto tracker_alloc_error;
195 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
196 goto tracker_alloc_error;
197 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
198 goto tracker_alloc_error;
199 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
200 goto tracker_alloc_error;
201
202 mutex_unlock(&sessions_mutex);
203
204 return session;
205
206 tracker_alloc_error:
207 lttng_id_tracker_fini(&session->pid_tracker);
208 lttng_id_tracker_fini(&session->vpid_tracker);
209 lttng_id_tracker_fini(&session->uid_tracker);
210 lttng_id_tracker_fini(&session->vuid_tracker);
211 lttng_id_tracker_fini(&session->gid_tracker);
212 lttng_id_tracker_fini(&session->vgid_tracker);
213 err_free_cache:
214 kfree(metadata_cache);
215 err_free_session_private:
216 lttng_kvfree(session_priv);
217 err_free_session:
218 lttng_kvfree(session);
219 err:
220 mutex_unlock(&sessions_mutex);
221 return NULL;
222 }
223
224 static
225 struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
226 {
227 struct lttng_counter_transport *transport;
228
229 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
230 if (!strcmp(transport->name, name))
231 return transport;
232 }
233 return NULL;
234 }
235
236 struct lttng_counter *lttng_kernel_counter_create(
237 const char *counter_transport_name,
238 size_t number_dimensions, const size_t *dimensions_sizes)
239 {
240 struct lttng_counter *counter = NULL;
241 struct lttng_counter_transport *counter_transport = NULL;
242
243 counter_transport = lttng_counter_transport_find(counter_transport_name);
244 if (!counter_transport) {
245 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
246 counter_transport_name);
247 goto notransport;
248 }
249 if (!try_module_get(counter_transport->owner)) {
250 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
251 goto notransport;
252 }
253
254 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
255 if (!counter)
256 goto nomem;
257
258 /* Create event notifier error counter. */
259 counter->ops = &counter_transport->ops;
260 counter->transport = counter_transport;
261
262 counter->counter = counter->ops->counter_create(
263 number_dimensions, dimensions_sizes, 0);
264 if (!counter->counter) {
265 goto create_error;
266 }
267
268 return counter;
269
270 create_error:
271 lttng_kvfree(counter);
272 nomem:
273 if (counter_transport)
274 module_put(counter_transport->owner);
275 notransport:
276 return NULL;
277 }
278
279 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
280 {
281 struct lttng_transport *transport = NULL;
282 struct lttng_event_notifier_group *event_notifier_group;
283 const char *transport_name = "relay-event-notifier";
284 size_t subbuf_size = 4096; //TODO
285 size_t num_subbuf = 16; //TODO
286 unsigned int switch_timer_interval = 0;
287 unsigned int read_timer_interval = 0;
288 int i;
289
290 mutex_lock(&sessions_mutex);
291
292 transport = lttng_transport_find(transport_name);
293 if (!transport) {
294 printk(KERN_WARNING "LTTng: transport %s not found\n",
295 transport_name);
296 goto notransport;
297 }
298 if (!try_module_get(transport->owner)) {
299 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
300 transport_name);
301 goto notransport;
302 }
303
304 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
305 GFP_KERNEL);
306 if (!event_notifier_group)
307 goto nomem;
308
309 /*
310 * Initialize the ring buffer used to store event notifier
311 * notifications.
312 */
313 event_notifier_group->ops = &transport->ops;
314 event_notifier_group->chan = transport->ops.priv->channel_create(
315 transport_name, event_notifier_group, NULL,
316 subbuf_size, num_subbuf, switch_timer_interval,
317 read_timer_interval);
318 if (!event_notifier_group->chan)
319 goto create_error;
320
321 event_notifier_group->transport = transport;
322
323 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
324 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
325 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
326 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
327
328 list_add(&event_notifier_group->node, &event_notifier_groups);
329
330 mutex_unlock(&sessions_mutex);
331
332 return event_notifier_group;
333
334 create_error:
335 lttng_kvfree(event_notifier_group);
336 nomem:
337 if (transport)
338 module_put(transport->owner);
339 notransport:
340 mutex_unlock(&sessions_mutex);
341 return NULL;
342 }
343
344 void metadata_cache_destroy(struct kref *kref)
345 {
346 struct lttng_metadata_cache *cache =
347 container_of(kref, struct lttng_metadata_cache, refcount);
348 vfree(cache->data);
349 kfree(cache);
350 }
351
352 void lttng_session_destroy(struct lttng_kernel_session *session)
353 {
354 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
355 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
356 struct lttng_metadata_stream *metadata_stream;
357 struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler;
358 int ret;
359
360 mutex_lock(&sessions_mutex);
361 WRITE_ONCE(session->active, 0);
362 list_for_each_entry(chan_priv, &session->priv->chan, node) {
363 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
364 WARN_ON(ret);
365 }
366 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
367 ret = _lttng_event_recorder_unregister(event_recorder_priv->pub);
368 WARN_ON(ret);
369 }
370 synchronize_trace(); /* Wait for in-flight events to complete */
371 list_for_each_entry(chan_priv, &session->priv->chan, node) {
372 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
373 WARN_ON(ret);
374 }
375 list_for_each_entry_safe(event_recorder_enabler, tmp_event_recorder_enabler,
376 &session->priv->enablers_head, node)
377 lttng_event_enabler_destroy(&event_recorder_enabler->parent);
378 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node)
379 _lttng_event_destroy(&event_recorder_priv->pub->parent);
380 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
381 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
382 _lttng_channel_destroy(chan_priv->pub);
383 }
384 mutex_lock(&session->priv->metadata_cache->lock);
385 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
386 _lttng_metadata_channel_hangup(metadata_stream);
387 mutex_unlock(&session->priv->metadata_cache->lock);
388 lttng_id_tracker_fini(&session->pid_tracker);
389 lttng_id_tracker_fini(&session->vpid_tracker);
390 lttng_id_tracker_fini(&session->uid_tracker);
391 lttng_id_tracker_fini(&session->vuid_tracker);
392 lttng_id_tracker_fini(&session->gid_tracker);
393 lttng_id_tracker_fini(&session->vgid_tracker);
394 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
395 list_del(&session->priv->list);
396 mutex_unlock(&sessions_mutex);
397 lttng_kvfree(session->priv);
398 lttng_kvfree(session);
399 }
400
401 void lttng_event_notifier_group_destroy(
402 struct lttng_event_notifier_group *event_notifier_group)
403 {
404 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
405 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
406 int ret;
407
408 if (!event_notifier_group)
409 return;
410
411 mutex_lock(&sessions_mutex);
412
413 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
414 WARN_ON(ret);
415
416 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
417 &event_notifier_group->event_notifiers_head, node) {
418 ret = _lttng_event_notifier_unregister(event_notifier_priv->pub);
419 WARN_ON(ret);
420 }
421
422 /* Wait for in-flight event notifier to complete */
423 synchronize_trace();
424
425 irq_work_sync(&event_notifier_group->wakeup_pending);
426
427 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
428 WARN_ON(ret);
429
430 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
431 &event_notifier_group->enablers_head, node)
432 lttng_event_enabler_destroy(&event_notifier_enabler->parent);
433
434 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
435 &event_notifier_group->event_notifiers_head, node)
436 _lttng_event_destroy(&event_notifier_priv->pub->parent);
437
438 if (event_notifier_group->error_counter) {
439 struct lttng_counter *error_counter = event_notifier_group->error_counter;
440
441 error_counter->ops->counter_destroy(error_counter->counter);
442 module_put(error_counter->transport->owner);
443 lttng_kvfree(error_counter);
444 event_notifier_group->error_counter = NULL;
445 }
446
447 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
448 module_put(event_notifier_group->transport->owner);
449 list_del(&event_notifier_group->node);
450
451 mutex_unlock(&sessions_mutex);
452 lttng_kvfree(event_notifier_group);
453 }
454
455 int lttng_session_statedump(struct lttng_kernel_session *session)
456 {
457 int ret;
458
459 mutex_lock(&sessions_mutex);
460 ret = lttng_statedump_start(session);
461 mutex_unlock(&sessions_mutex);
462 return ret;
463 }
464
465 int lttng_session_enable(struct lttng_kernel_session *session)
466 {
467 int ret = 0;
468 struct lttng_kernel_channel_buffer_private *chan_priv;
469
470 mutex_lock(&sessions_mutex);
471 if (session->active) {
472 ret = -EBUSY;
473 goto end;
474 }
475
476 /* Set transient enabler state to "enabled" */
477 session->priv->tstate = 1;
478
479 /* We need to sync enablers with session before activation. */
480 lttng_session_sync_event_enablers(session);
481
482 /*
483 * Snapshot the number of events per channel to know the type of header
484 * we need to use.
485 */
486 list_for_each_entry(chan_priv, &session->priv->chan, node) {
487 if (chan_priv->header_type)
488 continue; /* don't change it if session stop/restart */
489 if (chan_priv->free_event_id < 31)
490 chan_priv->header_type = 1; /* compact */
491 else
492 chan_priv->header_type = 2; /* large */
493 }
494
495 /* Clear each stream's quiescent state. */
496 list_for_each_entry(chan_priv, &session->priv->chan, node) {
497 if (chan_priv->channel_type != METADATA_CHANNEL)
498 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
499 }
500
501 WRITE_ONCE(session->active, 1);
502 WRITE_ONCE(session->priv->been_active, 1);
503 ret = _lttng_session_metadata_statedump(session);
504 if (ret) {
505 WRITE_ONCE(session->active, 0);
506 goto end;
507 }
508 ret = lttng_statedump_start(session);
509 if (ret)
510 WRITE_ONCE(session->active, 0);
511 end:
512 mutex_unlock(&sessions_mutex);
513 return ret;
514 }
515
516 int lttng_session_disable(struct lttng_kernel_session *session)
517 {
518 int ret = 0;
519 struct lttng_kernel_channel_buffer_private *chan_priv;
520
521 mutex_lock(&sessions_mutex);
522 if (!session->active) {
523 ret = -EBUSY;
524 goto end;
525 }
526 WRITE_ONCE(session->active, 0);
527
528 /* Set transient enabler state to "disabled" */
529 session->priv->tstate = 0;
530 lttng_session_sync_event_enablers(session);
531
532 /* Set each stream's quiescent state. */
533 list_for_each_entry(chan_priv, &session->priv->chan, node) {
534 if (chan_priv->channel_type != METADATA_CHANNEL)
535 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
536 }
537 end:
538 mutex_unlock(&sessions_mutex);
539 return ret;
540 }
541
542 int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
543 {
544 int ret = 0;
545 struct lttng_kernel_channel_buffer_private *chan_priv;
546 struct lttng_kernel_event_recorder_private *event_recorder_priv;
547 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
548 struct lttng_metadata_stream *stream;
549
550 mutex_lock(&sessions_mutex);
551 if (!session->active) {
552 ret = -EBUSY;
553 goto end;
554 }
555
556 mutex_lock(&cache->lock);
557 memset(cache->data, 0, cache->cache_alloc);
558 cache->metadata_written = 0;
559 cache->version++;
560 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
561 stream->metadata_out = 0;
562 stream->metadata_in = 0;
563 }
564 mutex_unlock(&cache->lock);
565
566 session->priv->metadata_dumped = 0;
567 list_for_each_entry(chan_priv, &session->priv->chan, node) {
568 chan_priv->metadata_dumped = 0;
569 }
570
571 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
572 event_recorder_priv->metadata_dumped = 0;
573 }
574
575 ret = _lttng_session_metadata_statedump(session);
576
577 end:
578 mutex_unlock(&sessions_mutex);
579 return ret;
580 }
581
582 static
583 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
584 {
585 struct lttng_kernel_channel_buffer *chan_buf;
586
587 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
588 return false;
589 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
590 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
591 return true;
592 return false;
593 }
594
595 int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
596 {
597 int ret = 0;
598
599 mutex_lock(&sessions_mutex);
600 if (is_channel_buffer_metadata(channel)) {
601 ret = -EPERM;
602 goto end;
603 }
604 if (channel->enabled) {
605 ret = -EEXIST;
606 goto end;
607 }
608 /* Set transient enabler state to "enabled" */
609 channel->priv->tstate = 1;
610 lttng_session_sync_event_enablers(channel->session);
611 /* Set atomically the state to "enabled" */
612 WRITE_ONCE(channel->enabled, 1);
613 end:
614 mutex_unlock(&sessions_mutex);
615 return ret;
616 }
617
618 int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
619 {
620 int ret = 0;
621
622 mutex_lock(&sessions_mutex);
623 if (is_channel_buffer_metadata(channel)) {
624 ret = -EPERM;
625 goto end;
626 }
627 if (!channel->enabled) {
628 ret = -EEXIST;
629 goto end;
630 }
631 /* Set atomically the state to "disabled" */
632 WRITE_ONCE(channel->enabled, 0);
633 /* Set transient enabler state to "enabled" */
634 channel->priv->tstate = 0;
635 lttng_session_sync_event_enablers(channel->session);
636 end:
637 mutex_unlock(&sessions_mutex);
638 return ret;
639 }
640
641 int lttng_event_enable(struct lttng_kernel_event_common *event)
642 {
643 int ret = 0;
644
645 mutex_lock(&sessions_mutex);
646 switch (event->type) {
647 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
648 {
649 struct lttng_kernel_event_recorder *event_recorder =
650 container_of(event, struct lttng_kernel_event_recorder, parent);
651
652 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
653 ret = -EPERM;
654 goto end;
655 }
656 break;
657 }
658 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
659 switch (event->priv->instrumentation) {
660 case LTTNG_KERNEL_ABI_KRETPROBE:
661 ret = -EINVAL;
662 goto end;
663 default:
664 break;
665 }
666 break;
667 default:
668 break;
669 }
670
671 if (event->enabled) {
672 ret = -EEXIST;
673 goto end;
674 }
675 switch (event->priv->instrumentation) {
676 case LTTNG_KERNEL_ABI_TRACEPOINT:
677 lttng_fallthrough;
678 case LTTNG_KERNEL_ABI_SYSCALL:
679 ret = -EINVAL;
680 break;
681
682 case LTTNG_KERNEL_ABI_KPROBE:
683 lttng_fallthrough;
684 case LTTNG_KERNEL_ABI_UPROBE:
685 WRITE_ONCE(event->enabled, 1);
686 break;
687
688 case LTTNG_KERNEL_ABI_KRETPROBE:
689 ret = lttng_kretprobes_event_enable_state(event, 1);
690 break;
691
692 case LTTNG_KERNEL_ABI_FUNCTION:
693 lttng_fallthrough;
694 case LTTNG_KERNEL_ABI_NOOP:
695 lttng_fallthrough;
696 default:
697 WARN_ON_ONCE(1);
698 ret = -EINVAL;
699 }
700 end:
701 mutex_unlock(&sessions_mutex);
702 return ret;
703 }
704
705 int lttng_event_disable(struct lttng_kernel_event_common *event)
706 {
707 int ret = 0;
708
709 mutex_lock(&sessions_mutex);
710 switch (event->type) {
711 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
712 {
713 struct lttng_kernel_event_recorder *event_recorder =
714 container_of(event, struct lttng_kernel_event_recorder, parent);
715
716 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
717 ret = -EPERM;
718 goto end;
719 }
720 break;
721 }
722 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
723 switch (event->priv->instrumentation) {
724 case LTTNG_KERNEL_ABI_KRETPROBE:
725 ret = -EINVAL;
726 goto end;
727 default:
728 break;
729 }
730 break;
731 default:
732 break;
733 }
734
735 if (!event->enabled) {
736 ret = -EEXIST;
737 goto end;
738 }
739 switch (event->priv->instrumentation) {
740 case LTTNG_KERNEL_ABI_TRACEPOINT:
741 lttng_fallthrough;
742 case LTTNG_KERNEL_ABI_SYSCALL:
743 ret = -EINVAL;
744 break;
745
746 case LTTNG_KERNEL_ABI_KPROBE:
747 lttng_fallthrough;
748 case LTTNG_KERNEL_ABI_UPROBE:
749 WRITE_ONCE(event->enabled, 0);
750 break;
751
752 case LTTNG_KERNEL_ABI_KRETPROBE:
753 ret = lttng_kretprobes_event_enable_state(event, 0);
754 break;
755
756 case LTTNG_KERNEL_ABI_FUNCTION:
757 lttng_fallthrough;
758 case LTTNG_KERNEL_ABI_NOOP:
759 lttng_fallthrough;
760 default:
761 WARN_ON_ONCE(1);
762 ret = -EINVAL;
763 }
764 end:
765 mutex_unlock(&sessions_mutex);
766 return ret;
767 }
768
769 struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
770 const char *transport_name,
771 void *buf_addr,
772 size_t subbuf_size, size_t num_subbuf,
773 unsigned int switch_timer_interval,
774 unsigned int read_timer_interval,
775 enum channel_type channel_type)
776 {
777 struct lttng_kernel_channel_buffer *chan;
778 struct lttng_kernel_channel_buffer_private *chan_priv;
779 struct lttng_transport *transport = NULL;
780
781 mutex_lock(&sessions_mutex);
782 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
783 goto active; /* Refuse to add channel to active session */
784 transport = lttng_transport_find(transport_name);
785 if (!transport) {
786 printk(KERN_WARNING "LTTng: transport %s not found\n",
787 transport_name);
788 goto notransport;
789 }
790 if (!try_module_get(transport->owner)) {
791 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
792 goto notransport;
793 }
794 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
795 if (!chan)
796 goto nomem;
797 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
798 if (!chan_priv)
799 goto nomem_priv;
800 chan->priv = chan_priv;
801 chan_priv->pub = chan;
802 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
803 chan->parent.session = session;
804 chan->priv->id = session->priv->free_chan_id++;
805 chan->ops = &transport->ops;
806 /*
807 * Note: the channel creation op already writes into the packet
808 * headers. Therefore the "chan" information used as input
809 * should be already accessible.
810 */
811 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
812 chan, buf_addr, subbuf_size, num_subbuf,
813 switch_timer_interval, read_timer_interval);
814 if (!chan->priv->rb_chan)
815 goto create_error;
816 chan->priv->parent.tstate = 1;
817 chan->parent.enabled = 1;
818 chan->priv->transport = transport;
819 chan->priv->channel_type = channel_type;
820 list_add(&chan->priv->node, &session->priv->chan);
821 mutex_unlock(&sessions_mutex);
822 return chan;
823
824 create_error:
825 kfree(chan_priv);
826 nomem_priv:
827 kfree(chan);
828 nomem:
829 if (transport)
830 module_put(transport->owner);
831 notransport:
832 active:
833 mutex_unlock(&sessions_mutex);
834 return NULL;
835 }
836
837 /*
838 * Only used internally at session destruction for per-cpu channels, and
839 * when metadata channel is released.
840 * Needs to be called with sessions mutex held.
841 */
842 static
843 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
844 {
845 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
846 module_put(chan->priv->transport->owner);
847 list_del(&chan->priv->node);
848 lttng_kernel_destroy_context(chan->priv->ctx);
849 kfree(chan->priv);
850 kfree(chan);
851 }
852
853 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
854 {
855 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
856
857 /* Protect the metadata cache with the sessions_mutex. */
858 mutex_lock(&sessions_mutex);
859 _lttng_channel_destroy(chan);
860 mutex_unlock(&sessions_mutex);
861 }
862 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
863
864 static
865 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
866 {
867 stream->finalized = 1;
868 wake_up_interruptible(&stream->read_wait);
869 }
870
871
872 /*
873 * Supports event creation while tracing session is active.
874 * Needs to be called with sessions mutex held.
875 */
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_kernel_channel_buffer *chan = event_enabler->chan;
880 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
881 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
882 struct lttng_kernel_session *session = chan->parent.session;
883 struct lttng_kernel_event_recorder *event_recorder;
884 struct lttng_kernel_event_recorder_private *event_recorder_priv;
885 const char *event_name;
886 struct hlist_head *head;
887 int ret;
888
889 if (chan->priv->free_event_id == -1U) {
890 ret = -EMFILE;
891 goto full;
892 }
893
894 switch (itype) {
895 case LTTNG_KERNEL_ABI_TRACEPOINT:
896 event_name = event_desc->event_name;
897 break;
898
899 case LTTNG_KERNEL_ABI_KPROBE:
900 lttng_fallthrough;
901 case LTTNG_KERNEL_ABI_UPROBE:
902 lttng_fallthrough;
903 case LTTNG_KERNEL_ABI_KRETPROBE:
904 lttng_fallthrough;
905 case LTTNG_KERNEL_ABI_SYSCALL:
906 event_name = event_param->name;
907 break;
908
909 case LTTNG_KERNEL_ABI_FUNCTION:
910 lttng_fallthrough;
911 case LTTNG_KERNEL_ABI_NOOP:
912 lttng_fallthrough;
913 default:
914 WARN_ON_ONCE(1);
915 ret = -EINVAL;
916 goto type_error;
917 }
918
919 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
920 LTTNG_EVENT_HT_SIZE, event_name);
921 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
922 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
923 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
924 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
925 && chan == event_recorder_priv->pub->chan) {
926 ret = -EEXIST;
927 goto exist;
928 }
929 }
930
931 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
932 if (!event_recorder) {
933 ret = -ENOMEM;
934 goto cache_error;
935 }
936 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
937 if (!event_recorder_priv) {
938 ret = -ENOMEM;
939 goto cache_private_error;
940 }
941 event_recorder_priv->pub = event_recorder;
942 event_recorder_priv->parent.pub = &event_recorder->parent;
943 event_recorder->priv = event_recorder_priv;
944 event_recorder->parent.priv = &event_recorder_priv->parent;
945 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
946
947 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
948 event_recorder->chan = chan;
949 event_recorder->priv->id = chan->priv->free_event_id++;
950 event_recorder->priv->parent.instrumentation = itype;
951 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
952 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
953
954 switch (itype) {
955 case LTTNG_KERNEL_ABI_TRACEPOINT:
956 /* Event will be enabled by enabler sync. */
957 event_recorder->parent.enabled = 0;
958 event_recorder->priv->parent.registered = 0;
959 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
960 if (!event_recorder->priv->parent.desc) {
961 ret = -ENOENT;
962 goto register_error;
963 }
964 /* Populate lttng_event structure before event registration. */
965 smp_wmb();
966 break;
967
968 case LTTNG_KERNEL_ABI_KPROBE:
969 /*
970 * Needs to be explicitly enabled after creation, since
971 * we may want to apply filters.
972 */
973 event_recorder->parent.enabled = 0;
974 event_recorder->priv->parent.registered = 1;
975 /*
976 * Populate lttng_event structure before event
977 * registration.
978 */
979 smp_wmb();
980 ret = lttng_kprobes_register_event(event_name,
981 event_param->u.kprobe.symbol_name,
982 event_param->u.kprobe.offset,
983 event_param->u.kprobe.addr,
984 &event_recorder->parent);
985 if (ret) {
986 ret = -EINVAL;
987 goto register_error;
988 }
989 ret = try_module_get(event_recorder->priv->parent.desc->owner);
990 WARN_ON_ONCE(!ret);
991 break;
992
993 case LTTNG_KERNEL_ABI_KRETPROBE:
994 {
995 struct lttng_kernel_event_recorder *event_recorder_return;
996 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
997
998 /* kretprobe defines 2 events */
999 /*
1000 * Needs to be explicitly enabled after creation, since
1001 * we may want to apply filters.
1002 */
1003 event_recorder->parent.enabled = 0;
1004 event_recorder->priv->parent.registered = 1;
1005
1006 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
1007 if (!event_recorder_return) {
1008 ret = -ENOMEM;
1009 goto register_error;
1010 }
1011 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1012 if (!event_recorder_return_priv) {
1013 kmem_cache_free(event_recorder_cache, event_recorder_return);
1014 ret = -ENOMEM;
1015 goto register_error;
1016 }
1017 event_recorder_return_priv->pub = event_recorder_return;
1018 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1019 event_recorder_return->priv = event_recorder_return_priv;
1020 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1021 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1022
1023 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
1024 event_recorder_return->chan = chan;
1025 event_recorder_return->priv->id = chan->priv->free_event_id++;
1026 event_recorder_return->priv->parent.instrumentation = itype;
1027 event_recorder_return->parent.enabled = 0;
1028 event_recorder_return->priv->parent.registered = 1;
1029 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1030 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
1031 /*
1032 * Populate lttng_event structure before kretprobe registration.
1033 */
1034 smp_wmb();
1035 ret = lttng_kretprobes_register(event_name,
1036 event_param->u.kretprobe.symbol_name,
1037 event_param->u.kretprobe.offset,
1038 event_param->u.kretprobe.addr,
1039 &event_recorder->parent, &event_recorder_return->parent);
1040 if (ret) {
1041 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1042 kmem_cache_free(event_recorder_cache, event_recorder_return);
1043 ret = -EINVAL;
1044 goto register_error;
1045 }
1046 /* Take 2 refs on the module: one per event. */
1047 ret = try_module_get(event_recorder->priv->parent.desc->owner);
1048 WARN_ON_ONCE(!ret);
1049 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
1050 WARN_ON_ONCE(!ret);
1051 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
1052 event_recorder_return);
1053 WARN_ON_ONCE(ret > 0);
1054 if (ret) {
1055 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1056 kmem_cache_free(event_recorder_cache, event_recorder_return);
1057 module_put(event_recorder_return->priv->parent.desc->owner);
1058 module_put(event_recorder->priv->parent.desc->owner);
1059 goto statedump_error;
1060 }
1061 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
1062 break;
1063 }
1064
1065 case LTTNG_KERNEL_ABI_SYSCALL:
1066 /*
1067 * Needs to be explicitly enabled after creation, since
1068 * we may want to apply filters.
1069 */
1070 event_recorder->parent.enabled = 0;
1071 event_recorder->priv->parent.registered = 0;
1072 event_recorder->priv->parent.desc = event_desc;
1073 switch (event_param->u.syscall.entryexit) {
1074 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
1075 ret = -EINVAL;
1076 goto register_error;
1077 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1078 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1079 break;
1080 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1081 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1082 break;
1083 }
1084 switch (event_param->u.syscall.abi) {
1085 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
1086 ret = -EINVAL;
1087 goto register_error;
1088 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
1089 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1090 break;
1091 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
1092 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1093 break;
1094 }
1095 if (!event_recorder->priv->parent.desc) {
1096 ret = -EINVAL;
1097 goto register_error;
1098 }
1099 break;
1100
1101 case LTTNG_KERNEL_ABI_UPROBE:
1102 /*
1103 * Needs to be explicitly enabled after creation, since
1104 * we may want to apply filters.
1105 */
1106 event_recorder->parent.enabled = 0;
1107 event_recorder->priv->parent.registered = 1;
1108
1109 /*
1110 * Populate lttng_event structure before event
1111 * registration.
1112 */
1113 smp_wmb();
1114
1115 ret = lttng_uprobes_register_event(event_param->name,
1116 event_param->u.uprobe.fd,
1117 &event_recorder->parent);
1118 if (ret)
1119 goto register_error;
1120 ret = try_module_get(event_recorder->priv->parent.desc->owner);
1121 WARN_ON_ONCE(!ret);
1122 break;
1123
1124 case LTTNG_KERNEL_ABI_FUNCTION:
1125 lttng_fallthrough;
1126 case LTTNG_KERNEL_ABI_NOOP:
1127 lttng_fallthrough;
1128 default:
1129 WARN_ON_ONCE(1);
1130 ret = -EINVAL;
1131 goto register_error;
1132 }
1133 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
1134 WARN_ON_ONCE(ret > 0);
1135 if (ret) {
1136 goto statedump_error;
1137 }
1138 hlist_add_head(&event_recorder->priv->hlist, head);
1139 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
1140 return event_recorder;
1141
1142 statedump_error:
1143 /* If a statedump error occurs, events will not be readable. */
1144 register_error:
1145 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1146 cache_private_error:
1147 kmem_cache_free(event_recorder_cache, event_recorder);
1148 cache_error:
1149 exist:
1150 type_error:
1151 full:
1152 return ERR_PTR(ret);
1153 }
1154
1155 struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
1156 const struct lttng_kernel_event_desc *event_desc,
1157 uint64_t token, uint64_t error_counter_index,
1158 struct lttng_event_notifier_group *event_notifier_group,
1159 struct lttng_kernel_abi_event_notifier *event_notifier_param,
1160 enum lttng_kernel_abi_instrumentation itype)
1161 {
1162 struct lttng_kernel_event_notifier *event_notifier;
1163 struct lttng_kernel_event_notifier_private *event_notifier_priv;
1164 struct lttng_counter *error_counter;
1165 const char *event_name;
1166 struct hlist_head *head;
1167 int ret;
1168
1169 switch (itype) {
1170 case LTTNG_KERNEL_ABI_TRACEPOINT:
1171 event_name = event_desc->event_name;
1172 break;
1173
1174 case LTTNG_KERNEL_ABI_KPROBE:
1175 lttng_fallthrough;
1176 case LTTNG_KERNEL_ABI_UPROBE:
1177 lttng_fallthrough;
1178 case LTTNG_KERNEL_ABI_SYSCALL:
1179 event_name = event_notifier_param->event.name;
1180 break;
1181
1182 case LTTNG_KERNEL_ABI_KRETPROBE:
1183 lttng_fallthrough;
1184 case LTTNG_KERNEL_ABI_FUNCTION:
1185 lttng_fallthrough;
1186 case LTTNG_KERNEL_ABI_NOOP:
1187 lttng_fallthrough;
1188 default:
1189 WARN_ON_ONCE(1);
1190 ret = -EINVAL;
1191 goto type_error;
1192 }
1193
1194 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1195 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
1196 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1197 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1198 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
1199 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
1200 && event_notifier_group == event_notifier_priv->group
1201 && token == event_notifier_priv->parent.user_token) {
1202 ret = -EEXIST;
1203 goto exist;
1204 }
1205 }
1206
1207 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1208 if (!event_notifier) {
1209 ret = -ENOMEM;
1210 goto cache_error;
1211 }
1212 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1213 if (!event_notifier_priv) {
1214 ret = -ENOMEM;
1215 goto cache_private_error;
1216 }
1217 event_notifier_priv->pub = event_notifier;
1218 event_notifier_priv->parent.pub = &event_notifier->parent;
1219 event_notifier->priv = event_notifier_priv;
1220 event_notifier->parent.priv = &event_notifier_priv->parent;
1221 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1222
1223 event_notifier->priv->group = event_notifier_group;
1224 event_notifier->priv->parent.user_token = token;
1225 event_notifier->priv->error_counter_index = error_counter_index;
1226 event_notifier->priv->num_captures = 0;
1227 event_notifier->priv->parent.instrumentation = itype;
1228 event_notifier->notification_send = lttng_event_notifier_notification_send;
1229 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1230 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1231 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
1232 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
1233
1234 switch (itype) {
1235 case LTTNG_KERNEL_ABI_TRACEPOINT:
1236 /* Event will be enabled by enabler sync. */
1237 event_notifier->parent.enabled = 0;
1238 event_notifier->priv->parent.registered = 0;
1239 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1240 if (!event_notifier->priv->parent.desc) {
1241 ret = -ENOENT;
1242 goto register_error;
1243 }
1244 /* Populate lttng_event_notifier structure before event registration. */
1245 smp_wmb();
1246 break;
1247
1248 case LTTNG_KERNEL_ABI_KPROBE:
1249 /*
1250 * Needs to be explicitly enabled after creation, since
1251 * we may want to apply filters.
1252 */
1253 event_notifier->parent.enabled = 0;
1254 event_notifier->priv->parent.registered = 1;
1255 /*
1256 * Populate lttng_event_notifier structure before event
1257 * registration.
1258 */
1259 smp_wmb();
1260 ret = lttng_kprobes_register_event(event_notifier_param->event.u.kprobe.symbol_name,
1261 event_notifier_param->event.u.kprobe.symbol_name,
1262 event_notifier_param->event.u.kprobe.offset,
1263 event_notifier_param->event.u.kprobe.addr,
1264 &event_notifier->parent);
1265 if (ret) {
1266 ret = -EINVAL;
1267 goto register_error;
1268 }
1269 ret = try_module_get(event_notifier->priv->parent.desc->owner);
1270 WARN_ON_ONCE(!ret);
1271 break;
1272
1273 case LTTNG_KERNEL_ABI_SYSCALL:
1274 /*
1275 * Needs to be explicitly enabled after creation, since
1276 * we may want to apply filters.
1277 */
1278 event_notifier->parent.enabled = 0;
1279 event_notifier->priv->parent.registered = 0;
1280 event_notifier->priv->parent.desc = event_desc;
1281 switch (event_notifier_param->event.u.syscall.entryexit) {
1282 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
1283 ret = -EINVAL;
1284 goto register_error;
1285 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1286 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1287 break;
1288 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1289 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1290 break;
1291 }
1292 switch (event_notifier_param->event.u.syscall.abi) {
1293 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
1294 ret = -EINVAL;
1295 goto register_error;
1296 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
1297 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1298 break;
1299 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
1300 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1301 break;
1302 }
1303
1304 if (!event_notifier->priv->parent.desc) {
1305 ret = -EINVAL;
1306 goto register_error;
1307 }
1308 break;
1309
1310 case LTTNG_KERNEL_ABI_UPROBE:
1311 /*
1312 * Needs to be explicitly enabled after creation, since
1313 * we may want to apply filters.
1314 */
1315 event_notifier->parent.enabled = 0;
1316 event_notifier->priv->parent.registered = 1;
1317
1318 /*
1319 * Populate lttng_event_notifier structure before
1320 * event_notifier registration.
1321 */
1322 smp_wmb();
1323
1324 ret = lttng_uprobes_register_event(event_notifier_param->event.name,
1325 event_notifier_param->event.u.uprobe.fd,
1326 &event_notifier->parent);
1327 if (ret)
1328 goto register_error;
1329 ret = try_module_get(event_notifier->priv->parent.desc->owner);
1330 WARN_ON_ONCE(!ret);
1331 break;
1332
1333 case LTTNG_KERNEL_ABI_KRETPROBE:
1334 lttng_fallthrough;
1335 case LTTNG_KERNEL_ABI_FUNCTION:
1336 lttng_fallthrough;
1337 case LTTNG_KERNEL_ABI_NOOP:
1338 lttng_fallthrough;
1339 default:
1340 WARN_ON_ONCE(1);
1341 ret = -EINVAL;
1342 goto register_error;
1343 }
1344
1345 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1346 hlist_add_head(&event_notifier->priv->hlist, head);
1347
1348 /*
1349 * Clear the error counter bucket. The sessiond keeps track of which
1350 * bucket is currently in use. We trust it. The session lock
1351 * synchronizes against concurrent creation of the error
1352 * counter.
1353 */
1354 error_counter = event_notifier_group->error_counter;
1355 if (error_counter) {
1356 size_t dimension_index[1];
1357
1358 /*
1359 * Check that the index is within the boundary of the counter.
1360 */
1361 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
1362 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1363 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1364 ret = -EINVAL;
1365 goto register_error;
1366 }
1367
1368 dimension_index[0] = event_notifier->priv->error_counter_index;
1369 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1370 if (ret) {
1371 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1372 event_notifier->priv->error_counter_index);
1373 goto register_error;
1374 }
1375 }
1376
1377 return event_notifier;
1378
1379 register_error:
1380 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1381 cache_private_error:
1382 kmem_cache_free(event_notifier_cache, event_notifier);
1383 cache_error:
1384 exist:
1385 type_error:
1386 return ERR_PTR(ret);
1387 }
1388
1389 int lttng_kernel_counter_read(struct lttng_counter *counter,
1390 const size_t *dim_indexes, int32_t cpu,
1391 int64_t *val, bool *overflow, bool *underflow)
1392 {
1393 return counter->ops->counter_read(counter->counter, dim_indexes,
1394 cpu, val, overflow, underflow);
1395 }
1396
1397 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1398 const size_t *dim_indexes, int64_t *val,
1399 bool *overflow, bool *underflow)
1400 {
1401 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1402 val, overflow, underflow);
1403 }
1404
1405 int lttng_kernel_counter_clear(struct lttng_counter *counter,
1406 const size_t *dim_indexes)
1407 {
1408 return counter->ops->counter_clear(counter->counter, dim_indexes);
1409 }
1410
1411 struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
1412 const struct lttng_kernel_event_desc *event_desc)
1413 {
1414 struct lttng_kernel_event_recorder *event;
1415
1416 mutex_lock(&sessions_mutex);
1417 event = _lttng_kernel_event_recorder_create(event_enabler, event_desc);
1418 mutex_unlock(&sessions_mutex);
1419 return event;
1420 }
1421
1422 struct lttng_kernel_event_notifier *lttng_event_notifier_create(
1423 const struct lttng_kernel_event_desc *event_desc,
1424 uint64_t id, uint64_t error_counter_index,
1425 struct lttng_event_notifier_group *event_notifier_group,
1426 struct lttng_kernel_abi_event_notifier *event_notifier_param,
1427 enum lttng_kernel_abi_instrumentation itype)
1428 {
1429 struct lttng_kernel_event_notifier *event_notifier;
1430
1431 mutex_lock(&sessions_mutex);
1432 event_notifier = _lttng_event_notifier_create(event_desc, id,
1433 error_counter_index, event_notifier_group,
1434 event_notifier_param, itype);
1435 mutex_unlock(&sessions_mutex);
1436 return event_notifier;
1437 }
1438
1439 /* Only used for tracepoints for now. */
1440 static
1441 void register_event_recorder(struct lttng_kernel_event_recorder *event_recorder)
1442 {
1443 const struct lttng_kernel_event_desc *desc;
1444 int ret = -EINVAL;
1445
1446 if (event_recorder->priv->parent.registered)
1447 return;
1448
1449 desc = event_recorder->priv->parent.desc;
1450 switch (event_recorder->priv->parent.instrumentation) {
1451 case LTTNG_KERNEL_ABI_TRACEPOINT:
1452 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
1453 desc->tp_class->probe_callback,
1454 &event_recorder->parent);
1455 break;
1456
1457 case LTTNG_KERNEL_ABI_SYSCALL:
1458 ret = lttng_syscall_filter_enable_event(&event_recorder->parent);
1459 break;
1460
1461 case LTTNG_KERNEL_ABI_KPROBE:
1462 lttng_fallthrough;
1463 case LTTNG_KERNEL_ABI_UPROBE:
1464 lttng_fallthrough;
1465 case LTTNG_KERNEL_ABI_KRETPROBE:
1466 ret = 0;
1467 break;
1468
1469 case LTTNG_KERNEL_ABI_FUNCTION:
1470 lttng_fallthrough;
1471 case LTTNG_KERNEL_ABI_NOOP:
1472 lttng_fallthrough;
1473 default:
1474 WARN_ON_ONCE(1);
1475 }
1476 if (!ret)
1477 event_recorder->priv->parent.registered = 1;
1478 }
1479
1480 /*
1481 * Only used internally at session destruction.
1482 */
1483 int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder *event_recorder)
1484 {
1485 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
1486 const struct lttng_kernel_event_desc *desc;
1487 int ret = -EINVAL;
1488
1489 if (!event_priv->registered)
1490 return 0;
1491
1492 desc = event_priv->desc;
1493 switch (event_priv->instrumentation) {
1494 case LTTNG_KERNEL_ABI_TRACEPOINT:
1495 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
1496 event_priv->desc->tp_class->probe_callback,
1497 &event_recorder->parent);
1498 break;
1499
1500 case LTTNG_KERNEL_ABI_KPROBE:
1501 lttng_kprobes_unregister_event(&event_recorder->parent);
1502 ret = 0;
1503 break;
1504
1505 case LTTNG_KERNEL_ABI_KRETPROBE:
1506 lttng_kretprobes_unregister(&event_recorder->parent);
1507 ret = 0;
1508 break;
1509
1510 case LTTNG_KERNEL_ABI_SYSCALL:
1511 ret = lttng_syscall_filter_disable_event(&event_recorder->parent);
1512 break;
1513
1514 case LTTNG_KERNEL_ABI_NOOP:
1515 ret = 0;
1516 break;
1517
1518 case LTTNG_KERNEL_ABI_UPROBE:
1519 lttng_uprobes_unregister_event(&event_recorder->parent);
1520 ret = 0;
1521 break;
1522
1523 case LTTNG_KERNEL_ABI_FUNCTION:
1524 lttng_fallthrough;
1525 default:
1526 WARN_ON_ONCE(1);
1527 }
1528 if (!ret)
1529 event_priv->registered = 0;
1530 return ret;
1531 }
1532
1533 /* Only used for tracepoints for now. */
1534 static
1535 void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
1536 {
1537 const struct lttng_kernel_event_desc *desc;
1538 int ret = -EINVAL;
1539
1540 if (event_notifier->priv->parent.registered)
1541 return;
1542
1543 desc = event_notifier->priv->parent.desc;
1544 switch (event_notifier->priv->parent.instrumentation) {
1545 case LTTNG_KERNEL_ABI_TRACEPOINT:
1546 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
1547 desc->tp_class->probe_callback,
1548 &event_notifier->parent);
1549 break;
1550
1551 case LTTNG_KERNEL_ABI_SYSCALL:
1552 ret = lttng_syscall_filter_enable_event(&event_notifier->parent);
1553 break;
1554
1555 case LTTNG_KERNEL_ABI_KPROBE:
1556 lttng_fallthrough;
1557 case LTTNG_KERNEL_ABI_UPROBE:
1558 ret = 0;
1559 break;
1560
1561 case LTTNG_KERNEL_ABI_KRETPROBE:
1562 lttng_fallthrough;
1563 case LTTNG_KERNEL_ABI_FUNCTION:
1564 lttng_fallthrough;
1565 case LTTNG_KERNEL_ABI_NOOP:
1566 lttng_fallthrough;
1567 default:
1568 WARN_ON_ONCE(1);
1569 }
1570 if (!ret)
1571 event_notifier->priv->parent.registered = 1;
1572 }
1573
1574 static
1575 int _lttng_event_notifier_unregister(
1576 struct lttng_kernel_event_notifier *event_notifier)
1577 {
1578 const struct lttng_kernel_event_desc *desc;
1579 int ret = -EINVAL;
1580
1581 if (!event_notifier->priv->parent.registered)
1582 return 0;
1583
1584 desc = event_notifier->priv->parent.desc;
1585 switch (event_notifier->priv->parent.instrumentation) {
1586 case LTTNG_KERNEL_ABI_TRACEPOINT:
1587 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
1588 event_notifier->priv->parent.desc->tp_class->probe_callback,
1589 &event_notifier->parent);
1590 break;
1591
1592 case LTTNG_KERNEL_ABI_KPROBE:
1593 lttng_kprobes_unregister_event(&event_notifier->parent);
1594 ret = 0;
1595 break;
1596
1597 case LTTNG_KERNEL_ABI_UPROBE:
1598 lttng_uprobes_unregister_event(&event_notifier->parent);
1599 ret = 0;
1600 break;
1601
1602 case LTTNG_KERNEL_ABI_SYSCALL:
1603 ret = lttng_syscall_filter_disable_event(&event_notifier->parent);
1604 break;
1605
1606 case LTTNG_KERNEL_ABI_KRETPROBE:
1607 lttng_fallthrough;
1608 case LTTNG_KERNEL_ABI_FUNCTION:
1609 lttng_fallthrough;
1610 case LTTNG_KERNEL_ABI_NOOP:
1611 lttng_fallthrough;
1612 default:
1613 WARN_ON_ONCE(1);
1614 }
1615 if (!ret)
1616 event_notifier->priv->parent.registered = 0;
1617 return ret;
1618 }
1619
1620 /*
1621 * Only used internally at session destruction.
1622 */
1623 static
1624 void _lttng_event_destroy(struct lttng_kernel_event_common *event)
1625 {
1626 struct lttng_kernel_event_common_private *event_priv = event->priv;
1627 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1628
1629 lttng_free_event_filter_runtime(event);
1630 /* Free event enabler refs */
1631 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1632 &event_priv->enablers_ref_head, node)
1633 kfree(enabler_ref);
1634
1635 switch (event->type) {
1636 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1637 {
1638 struct lttng_kernel_event_recorder *event_recorder =
1639 container_of(event, struct lttng_kernel_event_recorder, parent);
1640
1641 switch (event_priv->instrumentation) {
1642 case LTTNG_KERNEL_ABI_TRACEPOINT:
1643 lttng_event_desc_put(event_priv->desc);
1644 break;
1645
1646 case LTTNG_KERNEL_ABI_KPROBE:
1647 module_put(event_priv->desc->owner);
1648 lttng_kprobes_destroy_event_private(&event_recorder->parent);
1649 break;
1650
1651 case LTTNG_KERNEL_ABI_KRETPROBE:
1652 module_put(event_priv->desc->owner);
1653 lttng_kretprobes_destroy_private(&event_recorder->parent);
1654 break;
1655
1656 case LTTNG_KERNEL_ABI_SYSCALL:
1657 break;
1658
1659 case LTTNG_KERNEL_ABI_UPROBE:
1660 module_put(event_priv->desc->owner);
1661 lttng_uprobes_destroy_event_private(&event_recorder->parent);
1662 break;
1663
1664 case LTTNG_KERNEL_ABI_FUNCTION:
1665 lttng_fallthrough;
1666 case LTTNG_KERNEL_ABI_NOOP:
1667 lttng_fallthrough;
1668 default:
1669 WARN_ON_ONCE(1);
1670 }
1671 list_del(&event_recorder->priv->node);
1672 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1673 kmem_cache_free(event_recorder_cache, event_recorder);
1674 break;
1675 }
1676 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1677 {
1678 struct lttng_kernel_event_notifier *event_notifier =
1679 container_of(event, struct lttng_kernel_event_notifier, parent);
1680
1681 switch (event_notifier->priv->parent.instrumentation) {
1682 case LTTNG_KERNEL_ABI_TRACEPOINT:
1683 lttng_event_desc_put(event_notifier->priv->parent.desc);
1684 break;
1685
1686 case LTTNG_KERNEL_ABI_KPROBE:
1687 module_put(event_notifier->priv->parent.desc->owner);
1688 lttng_kprobes_destroy_event_private(&event_notifier->parent);
1689 break;
1690
1691 case LTTNG_KERNEL_ABI_SYSCALL:
1692 break;
1693
1694 case LTTNG_KERNEL_ABI_UPROBE:
1695 module_put(event_notifier->priv->parent.desc->owner);
1696 lttng_uprobes_destroy_event_private(&event_notifier->parent);
1697 break;
1698
1699 case LTTNG_KERNEL_ABI_KRETPROBE:
1700 lttng_fallthrough;
1701 case LTTNG_KERNEL_ABI_FUNCTION:
1702 lttng_fallthrough;
1703 case LTTNG_KERNEL_ABI_NOOP:
1704 lttng_fallthrough;
1705 default:
1706 WARN_ON_ONCE(1);
1707 }
1708 list_del(&event_notifier->priv->node);
1709 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1710 kmem_cache_free(event_notifier_cache, event_notifier);
1711 break;
1712 }
1713 default:
1714 WARN_ON_ONCE(1);
1715 }
1716 }
1717
1718 struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
1719 enum tracker_type tracker_type)
1720 {
1721 switch (tracker_type) {
1722 case TRACKER_PID:
1723 return &session->pid_tracker;
1724 case TRACKER_VPID:
1725 return &session->vpid_tracker;
1726 case TRACKER_UID:
1727 return &session->uid_tracker;
1728 case TRACKER_VUID:
1729 return &session->vuid_tracker;
1730 case TRACKER_GID:
1731 return &session->gid_tracker;
1732 case TRACKER_VGID:
1733 return &session->vgid_tracker;
1734 default:
1735 WARN_ON_ONCE(1);
1736 return NULL;
1737 }
1738 }
1739
1740 int lttng_session_track_id(struct lttng_kernel_session *session,
1741 enum tracker_type tracker_type, int id)
1742 {
1743 struct lttng_kernel_id_tracker *tracker;
1744 int ret;
1745
1746 tracker = get_tracker(session, tracker_type);
1747 if (!tracker)
1748 return -EINVAL;
1749 if (id < -1)
1750 return -EINVAL;
1751 mutex_lock(&sessions_mutex);
1752 if (id == -1) {
1753 /* track all ids: destroy tracker. */
1754 lttng_id_tracker_destroy(tracker, true);
1755 ret = 0;
1756 } else {
1757 ret = lttng_id_tracker_add(tracker, id);
1758 }
1759 mutex_unlock(&sessions_mutex);
1760 return ret;
1761 }
1762
1763 int lttng_session_untrack_id(struct lttng_kernel_session *session,
1764 enum tracker_type tracker_type, int id)
1765 {
1766 struct lttng_kernel_id_tracker *tracker;
1767 int ret;
1768
1769 tracker = get_tracker(session, tracker_type);
1770 if (!tracker)
1771 return -EINVAL;
1772 if (id < -1)
1773 return -EINVAL;
1774 mutex_lock(&sessions_mutex);
1775 if (id == -1) {
1776 /* untrack all ids: replace by empty tracker. */
1777 ret = lttng_id_tracker_empty_set(tracker);
1778 } else {
1779 ret = lttng_id_tracker_del(tracker, id);
1780 }
1781 mutex_unlock(&sessions_mutex);
1782 return ret;
1783 }
1784
1785 static
1786 void *id_list_start(struct seq_file *m, loff_t *pos)
1787 {
1788 struct lttng_kernel_id_tracker *id_tracker = m->private;
1789 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
1790 struct lttng_id_hash_node *e;
1791 int iter = 0, i;
1792
1793 mutex_lock(&sessions_mutex);
1794 if (id_tracker_p) {
1795 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1796 struct hlist_head *head = &id_tracker_p->id_hash[i];
1797
1798 lttng_hlist_for_each_entry(e, head, hlist) {
1799 if (iter++ >= *pos)
1800 return e;
1801 }
1802 }
1803 } else {
1804 /* ID tracker disabled. */
1805 if (iter >= *pos && iter == 0) {
1806 return id_tracker_p; /* empty tracker */
1807 }
1808 iter++;
1809 }
1810 /* End of list */
1811 return NULL;
1812 }
1813
1814 /* Called with sessions_mutex held. */
1815 static
1816 void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
1817 {
1818 struct lttng_kernel_id_tracker *id_tracker = m->private;
1819 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
1820 struct lttng_id_hash_node *e;
1821 int iter = 0, i;
1822
1823 (*ppos)++;
1824 if (id_tracker_p) {
1825 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1826 struct hlist_head *head = &id_tracker_p->id_hash[i];
1827
1828 lttng_hlist_for_each_entry(e, head, hlist) {
1829 if (iter++ >= *ppos)
1830 return e;
1831 }
1832 }
1833 } else {
1834 /* ID tracker disabled. */
1835 if (iter >= *ppos && iter == 0)
1836 return p; /* empty tracker */
1837 iter++;
1838 }
1839
1840 /* End of list */
1841 return NULL;
1842 }
1843
1844 static
1845 void id_list_stop(struct seq_file *m, void *p)
1846 {
1847 mutex_unlock(&sessions_mutex);
1848 }
1849
1850 static
1851 int id_list_show(struct seq_file *m, void *p)
1852 {
1853 struct lttng_kernel_id_tracker *id_tracker = m->private;
1854 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
1855 int id;
1856
1857 if (p == id_tracker_p) {
1858 /* Tracker disabled. */
1859 id = -1;
1860 } else {
1861 const struct lttng_id_hash_node *e = p;
1862
1863 id = lttng_id_tracker_get_node_id(e);
1864 }
1865 switch (id_tracker->priv->tracker_type) {
1866 case TRACKER_PID:
1867 seq_printf(m, "process { pid = %d; };\n", id);
1868 break;
1869 case TRACKER_VPID:
1870 seq_printf(m, "process { vpid = %d; };\n", id);
1871 break;
1872 case TRACKER_UID:
1873 seq_printf(m, "user { uid = %d; };\n", id);
1874 break;
1875 case TRACKER_VUID:
1876 seq_printf(m, "user { vuid = %d; };\n", id);
1877 break;
1878 case TRACKER_GID:
1879 seq_printf(m, "group { gid = %d; };\n", id);
1880 break;
1881 case TRACKER_VGID:
1882 seq_printf(m, "group { vgid = %d; };\n", id);
1883 break;
1884 default:
1885 seq_printf(m, "UNKNOWN { field = %d };\n", id);
1886 }
1887 return 0;
1888 }
1889
1890 static
1891 const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1892 .start = id_list_start,
1893 .next = id_list_next,
1894 .stop = id_list_stop,
1895 .show = id_list_show,
1896 };
1897
1898 static
1899 int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
1900 {
1901 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
1902 }
1903
1904 static
1905 int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
1906 {
1907 struct seq_file *m = file->private_data;
1908 struct lttng_kernel_id_tracker *id_tracker = m->private;
1909 int ret;
1910
1911 WARN_ON_ONCE(!id_tracker);
1912 ret = seq_release(inode, file);
1913 if (!ret)
1914 fput(id_tracker->priv->session->priv->file);
1915 return ret;
1916 }
1917
1918 const struct file_operations lttng_tracker_ids_list_fops = {
1919 .owner = THIS_MODULE,
1920 .open = lttng_tracker_ids_list_open,
1921 .read = seq_read,
1922 .llseek = seq_lseek,
1923 .release = lttng_tracker_ids_list_release,
1924 };
1925
1926 int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
1927 enum tracker_type tracker_type)
1928 {
1929 struct file *tracker_ids_list_file;
1930 struct seq_file *m;
1931 int file_fd, ret;
1932
1933 file_fd = lttng_get_unused_fd();
1934 if (file_fd < 0) {
1935 ret = file_fd;
1936 goto fd_error;
1937 }
1938
1939 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1940 &lttng_tracker_ids_list_fops,
1941 NULL, O_RDWR);
1942 if (IS_ERR(tracker_ids_list_file)) {
1943 ret = PTR_ERR(tracker_ids_list_file);
1944 goto file_error;
1945 }
1946 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
1947 ret = -EOVERFLOW;
1948 goto refcount_error;
1949 }
1950 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
1951 if (ret < 0)
1952 goto open_error;
1953 m = tracker_ids_list_file->private_data;
1954
1955 m->private = get_tracker(session, tracker_type);
1956 BUG_ON(!m->private);
1957 fd_install(file_fd, tracker_ids_list_file);
1958
1959 return file_fd;
1960
1961 open_error:
1962 atomic_long_dec(&session->priv->file->f_count);
1963 refcount_error:
1964 fput(tracker_ids_list_file);
1965 file_error:
1966 put_unused_fd(file_fd);
1967 fd_error:
1968 return ret;
1969 }
1970
1971 /*
1972 * Enabler management.
1973 */
1974 static
1975 int lttng_match_enabler_star_glob(const char *desc_name,
1976 const char *pattern)
1977 {
1978 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1979 desc_name, LTTNG_SIZE_MAX))
1980 return 0;
1981 return 1;
1982 }
1983
1984 static
1985 int lttng_match_enabler_name(const char *desc_name,
1986 const char *name)
1987 {
1988 if (strcmp(desc_name, name))
1989 return 0;
1990 return 1;
1991 }
1992
1993 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
1994 struct lttng_event_enabler_common *enabler)
1995 {
1996 const char *desc_name, *enabler_name;
1997 bool compat = false, entry = false;
1998
1999 enabler_name = enabler->event_param.name;
2000 switch (enabler->event_param.instrumentation) {
2001 case LTTNG_KERNEL_ABI_TRACEPOINT:
2002 desc_name = desc->event_name;
2003 switch (enabler->format_type) {
2004 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
2005 return lttng_match_enabler_star_glob(desc_name, enabler_name);
2006 case LTTNG_ENABLER_FORMAT_NAME:
2007 return lttng_match_enabler_name(desc_name, enabler_name);
2008 default:
2009 return -EINVAL;
2010 }
2011 break;
2012
2013 case LTTNG_KERNEL_ABI_SYSCALL:
2014 desc_name = desc->event_name;
2015 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
2016 desc_name += strlen("compat_");
2017 compat = true;
2018 }
2019 if (!strncmp(desc_name, "syscall_exit_",
2020 strlen("syscall_exit_"))) {
2021 desc_name += strlen("syscall_exit_");
2022 } else if (!strncmp(desc_name, "syscall_entry_",
2023 strlen("syscall_entry_"))) {
2024 desc_name += strlen("syscall_entry_");
2025 entry = true;
2026 } else {
2027 WARN_ON_ONCE(1);
2028 return -EINVAL;
2029 }
2030 switch (enabler->event_param.u.syscall.entryexit) {
2031 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
2032 break;
2033 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
2034 if (!entry)
2035 return 0;
2036 break;
2037 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
2038 if (entry)
2039 return 0;
2040 break;
2041 default:
2042 return -EINVAL;
2043 }
2044 switch (enabler->event_param.u.syscall.abi) {
2045 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
2046 break;
2047 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
2048 if (compat)
2049 return 0;
2050 break;
2051 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
2052 if (!compat)
2053 return 0;
2054 break;
2055 default:
2056 return -EINVAL;
2057 }
2058 switch (enabler->event_param.u.syscall.match) {
2059 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
2060 switch (enabler->format_type) {
2061 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
2062 return lttng_match_enabler_star_glob(desc_name, enabler_name);
2063 case LTTNG_ENABLER_FORMAT_NAME:
2064 return lttng_match_enabler_name(desc_name, enabler_name);
2065 default:
2066 return -EINVAL;
2067 }
2068 break;
2069 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
2070 return -EINVAL; /* Not implemented. */
2071 default:
2072 return -EINVAL;
2073 }
2074 break;
2075
2076 default:
2077 WARN_ON_ONCE(1);
2078 return -EINVAL;
2079 }
2080 }
2081
2082 static
2083 int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler *event_enabler,
2084 struct lttng_kernel_event_recorder *event_recorder)
2085 {
2086 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(
2087 event_enabler);
2088
2089 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
2090 return 0;
2091 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2092 && event_recorder->chan == event_enabler->chan)
2093 return 1;
2094 else
2095 return 0;
2096 }
2097
2098 static
2099 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
2100 struct lttng_kernel_event_notifier *event_notifier)
2101 {
2102 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(
2103 event_notifier_enabler);
2104
2105 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
2106 return 0;
2107 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2108 && event_notifier->priv->group == event_notifier_enabler->group
2109 && event_notifier->priv->parent.user_token == event_notifier_enabler->parent.user_token)
2110 return 1;
2111 else
2112 return 0;
2113 }
2114
2115 static
2116 struct lttng_enabler_ref *lttng_enabler_ref(
2117 struct list_head *enablers_ref_list,
2118 struct lttng_event_enabler_common *enabler)
2119 {
2120 struct lttng_enabler_ref *enabler_ref;
2121
2122 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
2123 if (enabler_ref->ref == enabler)
2124 return enabler_ref;
2125 }
2126 return NULL;
2127 }
2128
2129 static
2130 void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
2131 {
2132 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
2133 struct lttng_kernel_probe_desc *probe_desc;
2134 const struct lttng_kernel_event_desc *desc;
2135 int i;
2136 struct list_head *probe_list;
2137
2138 probe_list = lttng_get_probe_list_head();
2139 /*
2140 * For each probe event, if we find that a probe event matches
2141 * our enabler, create an associated lttng_event if not
2142 * already present.
2143 */
2144 list_for_each_entry(probe_desc, probe_list, head) {
2145 for (i = 0; i < probe_desc->nr_events; i++) {
2146 int found = 0;
2147 struct hlist_head *head;
2148 struct lttng_kernel_event_recorder_private *event_recorder_private;
2149 struct lttng_kernel_event_recorder *event_recorder;
2150
2151 desc = probe_desc->event_desc[i];
2152 if (!lttng_desc_match_enabler(desc,
2153 lttng_event_recorder_enabler_as_enabler(event_enabler)))
2154 continue;
2155
2156 /*
2157 * Check if already created.
2158 */
2159 head = utils_borrow_hash_table_bucket(
2160 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
2161 desc->event_name);
2162 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2163 if (event_recorder_private->parent.desc == desc
2164 && event_recorder_private->pub->chan == event_enabler->chan)
2165 found = 1;
2166 }
2167 if (found)
2168 continue;
2169
2170 /*
2171 * We need to create an event for this
2172 * event probe.
2173 */
2174 event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
2175 if (!event_recorder) {
2176 printk(KERN_INFO "LTTng: Unable to create event %s\n",
2177 probe_desc->event_desc[i]->event_name);
2178 }
2179 }
2180 }
2181 }
2182
2183 static
2184 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2185 {
2186 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2187 struct lttng_kernel_probe_desc *probe_desc;
2188 const struct lttng_kernel_event_desc *desc;
2189 int i;
2190 struct list_head *probe_list;
2191
2192 probe_list = lttng_get_probe_list_head();
2193 /*
2194 * For each probe event, if we find that a probe event matches
2195 * our enabler, create an associated lttng_event_notifier if not
2196 * already present.
2197 */
2198 list_for_each_entry(probe_desc, probe_list, head) {
2199 for (i = 0; i < probe_desc->nr_events; i++) {
2200 int found = 0;
2201 struct hlist_head *head;
2202 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2203 struct lttng_kernel_event_notifier *event_notifier;
2204
2205 desc = probe_desc->event_desc[i];
2206 if (!lttng_desc_match_enabler(desc,
2207 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2208 continue;
2209
2210 /*
2211 * Check if already created.
2212 */
2213 head = utils_borrow_hash_table_bucket(
2214 event_notifier_group->event_notifiers_ht.table,
2215 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
2216 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2217 if (event_notifier_priv->parent.desc == desc
2218 && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token)
2219 found = 1;
2220 }
2221 if (found)
2222 continue;
2223
2224 /*
2225 * We need to create a event_notifier for this event probe.
2226 */
2227 event_notifier = _lttng_event_notifier_create(desc,
2228 event_notifier_enabler->parent.user_token,
2229 event_notifier_enabler->error_counter_index,
2230 event_notifier_group, NULL,
2231 LTTNG_KERNEL_ABI_TRACEPOINT);
2232 if (IS_ERR(event_notifier)) {
2233 printk(KERN_INFO "Unable to create event_notifier %s\n",
2234 probe_desc->event_desc[i]->event_name);
2235 }
2236 }
2237 }
2238 }
2239
2240 static
2241 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
2242 {
2243 int ret;
2244
2245 ret = lttng_syscalls_register_event(event_enabler);
2246 WARN_ON_ONCE(ret);
2247 }
2248
2249 /*
2250 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2251 * tracepoint probes.
2252 * Should be called with sessions mutex held.
2253 */
2254 static
2255 void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
2256 {
2257 switch (event_enabler->parent.event_param.instrumentation) {
2258 case LTTNG_KERNEL_ABI_TRACEPOINT:
2259 lttng_create_tracepoint_event_if_missing(event_enabler);
2260 break;
2261
2262 case LTTNG_KERNEL_ABI_SYSCALL:
2263 lttng_create_syscall_event_if_missing(&event_enabler->parent);
2264 break;
2265
2266 default:
2267 WARN_ON_ONCE(1);
2268 break;
2269 }
2270 }
2271
2272 /*
2273 * Create events associated with an event_enabler (if not already present),
2274 * and add backward reference from the event to the enabler.
2275 * Should be called with sessions mutex held.
2276 */
2277 static
2278 int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
2279 {
2280 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2281 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
2282 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
2283 struct lttng_kernel_event_recorder_private *event_recorder_priv;
2284
2285 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2286 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2287 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
2288 !strcmp(base_enabler->event_param.name, "*")) {
2289 int enabled = base_enabler->enabled;
2290 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2291
2292 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2293 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
2294
2295 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2296 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
2297 }
2298
2299 /* First ensure that probe events are created for this enabler. */
2300 lttng_create_event_if_missing(event_enabler);
2301
2302 /* For each event matching event_enabler in session event list. */
2303 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
2304 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
2305 struct lttng_enabler_ref *enabler_ref;
2306
2307 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
2308 continue;
2309 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
2310 lttng_event_recorder_enabler_as_enabler(event_enabler));
2311 if (!enabler_ref) {
2312 /*
2313 * If no backward ref, create it.
2314 * Add backward ref from event to event_enabler.
2315 */
2316 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2317 if (!enabler_ref)
2318 return -ENOMEM;
2319 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
2320 list_add(&enabler_ref->node,
2321 &event_recorder_priv->parent.enablers_ref_head);
2322 }
2323
2324 /*
2325 * Link filter bytecodes if not linked yet.
2326 */
2327 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2328 lttng_static_ctx,
2329 &event_recorder_priv->parent.filter_bytecode_runtime_head,
2330 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
2331 }
2332 return 0;
2333 }
2334
2335 /*
2336 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2337 * tracepoint probes.
2338 * Should be called with sessions mutex held.
2339 */
2340 static
2341 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2342 {
2343 switch (event_notifier_enabler->parent.event_param.instrumentation) {
2344 case LTTNG_KERNEL_ABI_TRACEPOINT:
2345 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2346 break;
2347
2348 case LTTNG_KERNEL_ABI_SYSCALL:
2349 lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent);
2350 break;
2351
2352 default:
2353 WARN_ON_ONCE(1);
2354 break;
2355 }
2356 }
2357
2358 /*
2359 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2360 */
2361 static
2362 int lttng_event_notifier_enabler_ref_event_notifiers(
2363 struct lttng_event_notifier_enabler *event_notifier_enabler)
2364 {
2365 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2366 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2367 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2368
2369 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2370 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2371 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
2372 !strcmp(base_enabler->event_param.name, "*")) {
2373
2374 int enabled = base_enabler->enabled;
2375 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2376
2377 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2378 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
2379
2380 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
2381 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
2382
2383 }
2384
2385 /* First ensure that probe event_notifiers are created for this enabler. */
2386 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2387
2388 /* Link the created event_notifier with its associated enabler. */
2389 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2390 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
2391 struct lttng_enabler_ref *enabler_ref;
2392
2393 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2394 continue;
2395
2396 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
2397 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2398 if (!enabler_ref) {
2399 /*
2400 * If no backward ref, create it.
2401 * Add backward ref from event_notifier to enabler.
2402 */
2403 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2404 if (!enabler_ref)
2405 return -ENOMEM;
2406
2407 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2408 event_notifier_enabler);
2409 list_add(&enabler_ref->node,
2410 &event_notifier_priv->parent.enablers_ref_head);
2411 }
2412
2413 /*
2414 * Link filter bytecodes if not linked yet.
2415 */
2416 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2417 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
2418 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
2419
2420 /* Link capture bytecodes if not linked yet. */
2421 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2422 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
2423 &event_notifier_enabler->capture_bytecode_head);
2424
2425 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
2426 }
2427 return 0;
2428 }
2429
2430 /*
2431 * Called at module load: connect the probe on all enablers matching
2432 * this event.
2433 * Called with sessions lock held.
2434 */
2435 int lttng_fix_pending_events(void)
2436 {
2437 struct lttng_kernel_session_private *session_priv;
2438
2439 list_for_each_entry(session_priv, &sessions, list)
2440 lttng_session_lazy_sync_event_enablers(session_priv->pub);
2441 return 0;
2442 }
2443
2444 static bool lttng_event_notifier_group_has_active_event_notifiers(
2445 struct lttng_event_notifier_group *event_notifier_group)
2446 {
2447 struct lttng_event_notifier_enabler *event_notifier_enabler;
2448
2449 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2450 node) {
2451 if (event_notifier_enabler->parent.enabled)
2452 return true;
2453 }
2454 return false;
2455 }
2456
2457 bool lttng_event_notifier_active(void)
2458 {
2459 struct lttng_event_notifier_group *event_notifier_group;
2460
2461 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2462 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2463 return true;
2464 }
2465 return false;
2466 }
2467
2468 int lttng_fix_pending_event_notifiers(void)
2469 {
2470 struct lttng_event_notifier_group *event_notifier_group;
2471
2472 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2473 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2474 return 0;
2475 }
2476
2477 struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
2478 enum lttng_enabler_format_type format_type,
2479 struct lttng_kernel_abi_event *event_param,
2480 struct lttng_kernel_channel_buffer *chan)
2481 {
2482 struct lttng_event_recorder_enabler *event_enabler;
2483
2484 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2485 if (!event_enabler)
2486 return NULL;
2487 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
2488 event_enabler->parent.format_type = format_type;
2489 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2490 memcpy(&event_enabler->parent.event_param, event_param,
2491 sizeof(event_enabler->parent.event_param));
2492 event_enabler->chan = chan;
2493 /* ctx left NULL */
2494 event_enabler->parent.enabled = 0;
2495 return event_enabler;
2496 }
2497
2498 void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
2499 struct lttng_event_recorder_enabler *event_enabler)
2500 {
2501 mutex_lock(&sessions_mutex);
2502 list_add(&event_enabler->node, &session->priv->enablers_head);
2503 event_enabler->published = true;
2504 lttng_session_lazy_sync_event_enablers(session);
2505 mutex_unlock(&sessions_mutex);
2506 }
2507
2508 int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
2509 {
2510 mutex_lock(&sessions_mutex);
2511 event_enabler->enabled = 1;
2512 lttng_event_enabler_sync(event_enabler);
2513 mutex_unlock(&sessions_mutex);
2514 return 0;
2515 }
2516
2517 int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
2518 {
2519 mutex_lock(&sessions_mutex);
2520 event_enabler->enabled = 0;
2521 lttng_event_enabler_sync(event_enabler);
2522 mutex_unlock(&sessions_mutex);
2523 return 0;
2524 }
2525
2526 static
2527 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
2528 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
2529 {
2530 struct lttng_kernel_bytecode_node *bytecode_node;
2531 uint32_t bytecode_len;
2532 int ret;
2533
2534 ret = get_user(bytecode_len, &bytecode->len);
2535 if (ret)
2536 return ret;
2537 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2538 GFP_KERNEL);
2539 if (!bytecode_node)
2540 return -ENOMEM;
2541 ret = copy_from_user(&bytecode_node->bc, bytecode,
2542 sizeof(*bytecode) + bytecode_len);
2543 if (ret)
2544 goto error_free;
2545
2546 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
2547 bytecode_node->enabler = enabler;
2548 /* Enforce length based on allocated size */
2549 bytecode_node->bc.len = bytecode_len;
2550 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
2551
2552 return 0;
2553
2554 error_free:
2555 lttng_kvfree(bytecode_node);
2556 return ret;
2557 }
2558
2559 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
2560 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
2561 {
2562 int ret;
2563 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
2564 if (ret)
2565 goto error;
2566 lttng_event_enabler_sync(event_enabler);
2567 return 0;
2568
2569 error:
2570 return ret;
2571 }
2572
2573 int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
2574 struct lttng_kernel_abi_event_callsite __user *callsite)
2575 {
2576
2577 switch (event->priv->instrumentation) {
2578 case LTTNG_KERNEL_ABI_UPROBE:
2579 return lttng_uprobes_event_add_callsite(event, callsite);
2580 default:
2581 return -EINVAL;
2582 }
2583 }
2584
2585 static
2586 void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
2587 {
2588 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
2589
2590 /* Destroy filter bytecode */
2591 list_for_each_entry_safe(filter_node, tmp_filter_node,
2592 &enabler->filter_bytecode_head, node) {
2593 lttng_kvfree(filter_node);
2594 }
2595 }
2596
2597 void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
2598 {
2599 switch (event_enabler->enabler_type) {
2600 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2601 {
2602 struct lttng_event_recorder_enabler *event_recorder_enabler =
2603 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2604
2605 lttng_enabler_destroy(event_enabler);
2606 if (event_recorder_enabler->published)
2607 list_del(&event_recorder_enabler->node);
2608 kfree(event_recorder_enabler);
2609 break;
2610 }
2611 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2612 {
2613 struct lttng_event_notifier_enabler *event_notifier_enabler =
2614 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2615
2616 list_del(&event_notifier_enabler->node);
2617 lttng_enabler_destroy(event_enabler);
2618 kfree(event_notifier_enabler);
2619 break;
2620 }
2621 default:
2622 WARN_ON_ONCE(1);
2623 }
2624 }
2625
2626 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2627 struct lttng_event_notifier_group *event_notifier_group,
2628 enum lttng_enabler_format_type format_type,
2629 struct lttng_kernel_abi_event_notifier *event_notifier_param)
2630 {
2631 struct lttng_event_notifier_enabler *event_notifier_enabler;
2632
2633 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2634 if (!event_notifier_enabler)
2635 return NULL;
2636
2637 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
2638 event_notifier_enabler->parent.format_type = format_type;
2639 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
2640 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2641
2642 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
2643 event_notifier_enabler->num_captures = 0;
2644
2645 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2646 sizeof(event_notifier_enabler->parent.event_param));
2647
2648 event_notifier_enabler->parent.enabled = 0;
2649 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
2650 event_notifier_enabler->group = event_notifier_group;
2651
2652 mutex_lock(&sessions_mutex);
2653 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
2654 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2655
2656 mutex_unlock(&sessions_mutex);
2657
2658 return event_notifier_enabler;
2659 }
2660
2661 int lttng_event_notifier_enabler_enable(
2662 struct lttng_event_notifier_enabler *event_notifier_enabler)
2663 {
2664 mutex_lock(&sessions_mutex);
2665 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
2666 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2667 mutex_unlock(&sessions_mutex);
2668 return 0;
2669 }
2670
2671 int lttng_event_notifier_enabler_disable(
2672 struct lttng_event_notifier_enabler *event_notifier_enabler)
2673 {
2674 mutex_lock(&sessions_mutex);
2675 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
2676 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2677 mutex_unlock(&sessions_mutex);
2678 return 0;
2679 }
2680
2681 int lttng_event_notifier_enabler_attach_capture_bytecode(
2682 struct lttng_event_notifier_enabler *event_notifier_enabler,
2683 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
2684 {
2685 struct lttng_kernel_bytecode_node *bytecode_node;
2686 struct lttng_event_enabler_common *enabler =
2687 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2688 uint32_t bytecode_len;
2689 int ret;
2690
2691 ret = get_user(bytecode_len, &bytecode->len);
2692 if (ret)
2693 return ret;
2694
2695 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2696 GFP_KERNEL);
2697 if (!bytecode_node)
2698 return -ENOMEM;
2699
2700 ret = copy_from_user(&bytecode_node->bc, bytecode,
2701 sizeof(*bytecode) + bytecode_len);
2702 if (ret)
2703 goto error_free;
2704
2705 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
2706 bytecode_node->enabler = enabler;
2707
2708 /* Enforce length based on allocated size */
2709 bytecode_node->bc.len = bytecode_len;
2710 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2711
2712 event_notifier_enabler->num_captures++;
2713
2714 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2715 goto end;
2716
2717 error_free:
2718 lttng_kvfree(bytecode_node);
2719 end:
2720 return ret;
2721 }
2722
2723 /*
2724 * lttng_session_sync_event_enablers should be called just before starting a
2725 * session.
2726 * Should be called with sessions mutex held.
2727 */
2728 static
2729 void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2730 {
2731 struct lttng_event_recorder_enabler *event_enabler;
2732 struct lttng_kernel_event_recorder_private *event_recorder_priv;
2733
2734 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
2735 lttng_event_enabler_ref_events(event_enabler);
2736 /*
2737 * For each event, if at least one of its enablers is enabled,
2738 * and its channel and session transient states are enabled, we
2739 * enable the event, else we disable it.
2740 */
2741 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
2742 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
2743 struct lttng_enabler_ref *enabler_ref;
2744 struct lttng_kernel_bytecode_runtime *runtime;
2745 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2746 int nr_filters = 0;
2747
2748 switch (event_recorder_priv->parent.instrumentation) {
2749 case LTTNG_KERNEL_ABI_TRACEPOINT:
2750 lttng_fallthrough;
2751 case LTTNG_KERNEL_ABI_SYSCALL:
2752 /* Enable events */
2753 list_for_each_entry(enabler_ref,
2754 &event_recorder_priv->parent.enablers_ref_head, node) {
2755 if (enabler_ref->ref->enabled) {
2756 enabled = 1;
2757 break;
2758 }
2759 }
2760 break;
2761
2762 default:
2763 /* Not handled with lazy sync. */
2764 continue;
2765 }
2766 /*
2767 * Enabled state is based on union of enablers, with
2768 * intesection of session and channel transient enable
2769 * states.
2770 */
2771 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2772
2773 WRITE_ONCE(event_recorder->parent.enabled, enabled);
2774 /*
2775 * Sync tracepoint registration with event enabled
2776 * state.
2777 */
2778 if (enabled) {
2779 register_event_recorder(event_recorder);
2780 } else {
2781 _lttng_event_recorder_unregister(event_recorder);
2782 }
2783
2784 /* Check if has enablers without bytecode enabled */
2785 list_for_each_entry(enabler_ref,
2786 &event_recorder_priv->parent.enablers_ref_head, node) {
2787 if (enabler_ref->ref->enabled
2788 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2789 has_enablers_without_filter_bytecode = 1;
2790 break;
2791 }
2792 }
2793 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
2794 has_enablers_without_filter_bytecode;
2795
2796 /* Enable filters */
2797 list_for_each_entry(runtime,
2798 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
2799 lttng_bytecode_sync_state(runtime);
2800 nr_filters++;
2801 }
2802 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2803 !(has_enablers_without_filter_bytecode || !nr_filters));
2804 }
2805 }
2806
2807 /*
2808 * Apply enablers to session events, adding events to session if need
2809 * be. It is required after each modification applied to an active
2810 * session, and right before session "start".
2811 * "lazy" sync means we only sync if required.
2812 * Should be called with sessions mutex held.
2813 */
2814 static
2815 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
2816 {
2817 /* We can skip if session is not active */
2818 if (!session->active)
2819 return;
2820 lttng_session_sync_event_enablers(session);
2821 }
2822
2823 static
2824 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2825 {
2826 struct lttng_event_notifier_enabler *event_notifier_enabler;
2827 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2828
2829 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2830 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2831
2832 /*
2833 * For each event_notifier, if at least one of its enablers is enabled,
2834 * we enable the event_notifier, else we disable it.
2835 */
2836 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2837 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
2838 struct lttng_enabler_ref *enabler_ref;
2839 struct lttng_kernel_bytecode_runtime *runtime;
2840 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2841 int nr_filters = 0, nr_captures = 0;
2842
2843 switch (event_notifier_priv->parent.instrumentation) {
2844 case LTTNG_KERNEL_ABI_TRACEPOINT:
2845 lttng_fallthrough;
2846 case LTTNG_KERNEL_ABI_SYSCALL:
2847 /* Enable event_notifiers */
2848 list_for_each_entry(enabler_ref,
2849 &event_notifier_priv->parent.enablers_ref_head, node) {
2850 if (enabler_ref->ref->enabled) {
2851 enabled = 1;
2852 break;
2853 }
2854 }
2855 break;
2856
2857 default:
2858 /* Not handled with sync. */
2859 continue;
2860 }
2861
2862 WRITE_ONCE(event_notifier->parent.enabled, enabled);
2863 /*
2864 * Sync tracepoint registration with event_notifier enabled
2865 * state.
2866 */
2867 if (enabled) {
2868 if (!event_notifier_priv->parent.registered)
2869 register_event_notifier(event_notifier);
2870 } else {
2871 if (event_notifier_priv->parent.registered)
2872 _lttng_event_notifier_unregister(event_notifier);
2873 }
2874
2875 /* Check if has enablers without bytecode enabled */
2876 list_for_each_entry(enabler_ref,
2877 &event_notifier_priv->parent.enablers_ref_head, node) {
2878 if (enabler_ref->ref->enabled
2879 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2880 has_enablers_without_filter_bytecode = 1;
2881 break;
2882 }
2883 }
2884 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
2885 has_enablers_without_filter_bytecode;
2886
2887 /* Enable filters */
2888 list_for_each_entry(runtime,
2889 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
2890 lttng_bytecode_sync_state(runtime);
2891 nr_filters++;
2892 }
2893 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2894 !(has_enablers_without_filter_bytecode || !nr_filters));
2895
2896 /* Enable captures */
2897 list_for_each_entry(runtime,
2898 &event_notifier_priv->capture_bytecode_runtime_head, node) {
2899 lttng_bytecode_sync_state(runtime);
2900 nr_captures++;
2901 }
2902 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2903 }
2904 }
2905
2906 static
2907 void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2908 {
2909 switch (event_enabler->enabler_type) {
2910 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2911 {
2912 struct lttng_event_recorder_enabler *event_recorder_enabler =
2913 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2914 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2915 break;
2916 }
2917 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2918 {
2919 struct lttng_event_notifier_enabler *event_notifier_enabler =
2920 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2921 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2922 break;
2923 }
2924 default:
2925 WARN_ON_ONCE(1);
2926 }
2927 }
2928
2929 /*
2930 * Serialize at most one packet worth of metadata into a metadata
2931 * channel.
2932 * We grab the metadata cache mutex to get exclusive access to our metadata
2933 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2934 * allows us to do racy operations such as looking for remaining space left in
2935 * packet and write, since mutual exclusion protects us from concurrent writes.
2936 * Mutual exclusion on the metadata cache allow us to read the cache content
2937 * without racing against reallocation of the cache by updates.
2938 * Returns the number of bytes written in the channel, 0 if no data
2939 * was written and a negative value on error.
2940 */
2941 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
2942 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
2943 {
2944 struct lttng_kernel_ring_buffer_ctx ctx;
2945 int ret = 0;
2946 size_t len, reserve_len;
2947
2948 /*
2949 * Ensure we support mutiple get_next / put sequences followed by
2950 * put_next. The metadata cache lock protects reading the metadata
2951 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2952 * "flush" operations on the buffer invoked by different processes.
2953 * Moreover, since the metadata cache memory can be reallocated, we
2954 * need to have exclusive access against updates even though we only
2955 * read it.
2956 */
2957 mutex_lock(&stream->metadata_cache->lock);
2958 WARN_ON(stream->metadata_in < stream->metadata_out);
2959 if (stream->metadata_in != stream->metadata_out)
2960 goto end;
2961
2962 /* Metadata regenerated, change the version. */
2963 if (stream->metadata_cache->version != stream->version)
2964 stream->version = stream->metadata_cache->version;
2965
2966 len = stream->metadata_cache->metadata_written -
2967 stream->metadata_in;
2968 if (!len)
2969 goto end;
2970 reserve_len = min_t(size_t,
2971 stream->transport->ops.priv->packet_avail_size(chan),
2972 len);
2973 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
2974 sizeof(char), NULL);
2975 /*
2976 * If reservation failed, return an error to the caller.
2977 */
2978 ret = stream->transport->ops.event_reserve(&ctx);
2979 if (ret != 0) {
2980 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
2981 stream->coherent = false;
2982 goto end;
2983 }
2984 stream->transport->ops.event_write(&ctx,
2985 stream->metadata_cache->data + stream->metadata_in,
2986 reserve_len, 1);
2987 stream->transport->ops.event_commit(&ctx);
2988 stream->metadata_in += reserve_len;
2989 if (reserve_len < len)
2990 stream->coherent = false;
2991 else
2992 stream->coherent = true;
2993 ret = reserve_len;
2994
2995 end:
2996 if (coherent)
2997 *coherent = stream->coherent;
2998 mutex_unlock(&stream->metadata_cache->lock);
2999 return ret;
3000 }
3001
3002 static
3003 void lttng_metadata_begin(struct lttng_kernel_session *session)
3004 {
3005 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
3006 mutex_lock(&session->priv->metadata_cache->lock);
3007 }
3008
3009 static
3010 void lttng_metadata_end(struct lttng_kernel_session *session)
3011 {
3012 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3013 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3014 struct lttng_metadata_stream *stream;
3015
3016 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3017 wake_up_interruptible(&stream->read_wait);
3018 mutex_unlock(&session->priv->metadata_cache->lock);
3019 }
3020 }
3021
3022 /*
3023 * Write the metadata to the metadata cache.
3024 * Must be called with sessions_mutex held.
3025 * The metadata cache lock protects us from concurrent read access from
3026 * thread outputting metadata content to ring buffer.
3027 * The content of the printf is printed as a single atomic metadata
3028 * transaction.
3029 */
3030 int lttng_metadata_printf(struct lttng_kernel_session *session,
3031 const char *fmt, ...)
3032 {
3033 char *str;
3034 size_t len;
3035 va_list ap;
3036
3037 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
3038
3039 va_start(ap, fmt);
3040 str = kvasprintf(GFP_KERNEL, fmt, ap);
3041 va_end(ap);
3042 if (!str)
3043 return -ENOMEM;
3044
3045 len = strlen(str);
3046 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3047 if (session->priv->metadata_cache->metadata_written + len >
3048 session->priv->metadata_cache->cache_alloc) {
3049 char *tmp_cache_realloc;
3050 unsigned int tmp_cache_alloc_size;
3051
3052 tmp_cache_alloc_size = max_t(unsigned int,
3053 session->priv->metadata_cache->cache_alloc + len,
3054 session->priv->metadata_cache->cache_alloc << 1);
3055 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
3056 if (!tmp_cache_realloc)
3057 goto err;
3058 if (session->priv->metadata_cache->data) {
3059 memcpy(tmp_cache_realloc,
3060 session->priv->metadata_cache->data,
3061 session->priv->metadata_cache->cache_alloc);
3062 vfree(session->priv->metadata_cache->data);
3063 }
3064
3065 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3066 session->priv->metadata_cache->data = tmp_cache_realloc;
3067 }
3068 memcpy(session->priv->metadata_cache->data +
3069 session->priv->metadata_cache->metadata_written,
3070 str, len);
3071 session->priv->metadata_cache->metadata_written += len;
3072 kfree(str);
3073
3074 return 0;
3075
3076 err:
3077 kfree(str);
3078 return -ENOMEM;
3079 }
3080
3081 static
3082 int print_tabs(struct lttng_kernel_session *session, size_t nesting)
3083 {
3084 size_t i;
3085
3086 for (i = 0; i < nesting; i++) {
3087 int ret;
3088
3089 ret = lttng_metadata_printf(session, " ");
3090 if (ret) {
3091 return ret;
3092 }
3093 }
3094 return 0;
3095 }
3096
3097 static
3098 int lttng_field_name_statedump(struct lttng_kernel_session *session,
3099 const struct lttng_kernel_event_field *field,
3100 size_t nesting)
3101 {
3102 return lttng_metadata_printf(session, " _%s;\n", field->name);
3103 }
3104
3105 static
3106 int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
3107 const struct lttng_kernel_type_integer *type,
3108 enum lttng_kernel_string_encoding parent_encoding,
3109 size_t nesting)
3110 {
3111 int ret;
3112
3113 ret = print_tabs(session, nesting);
3114 if (ret)
3115 return ret;
3116 ret = lttng_metadata_printf(session,
3117 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3118 type->size,
3119 type->alignment,
3120 type->signedness,
3121 (parent_encoding == lttng_kernel_string_encoding_none)
3122 ? "none"
3123 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
3124 ? "UTF8"
3125 : "ASCII",
3126 type->base,
3127 #if __BYTE_ORDER == __BIG_ENDIAN
3128 type->reverse_byte_order ? " byte_order = le;" : ""
3129 #else
3130 type->reverse_byte_order ? " byte_order = be;" : ""
3131 #endif
3132 );
3133 return ret;
3134 }
3135
3136 /*
3137 * Must be called with sessions_mutex held.
3138 */
3139 static
3140 int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
3141 const struct lttng_kernel_type_struct *type,
3142 size_t nesting)
3143 {
3144 const char *prev_field_name = NULL;
3145 int ret;
3146 uint32_t i, nr_fields;
3147 unsigned int alignment;
3148
3149 ret = print_tabs(session, nesting);
3150 if (ret)
3151 return ret;
3152 ret = lttng_metadata_printf(session,
3153 "struct {\n");
3154 if (ret)
3155 return ret;
3156 nr_fields = type->nr_fields;
3157 for (i = 0; i < nr_fields; i++) {
3158 const struct lttng_kernel_event_field *iter_field;
3159
3160 iter_field = type->fields[i];
3161 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
3162 if (ret)
3163 return ret;
3164 }
3165 ret = print_tabs(session, nesting);
3166 if (ret)
3167 return ret;
3168 alignment = type->alignment;
3169 if (alignment) {
3170 ret = lttng_metadata_printf(session,
3171 "} align(%u)",
3172 alignment);
3173 } else {
3174 ret = lttng_metadata_printf(session,
3175 "}");
3176 }
3177 return ret;
3178 }
3179
3180 /*
3181 * Must be called with sessions_mutex held.
3182 */
3183 static
3184 int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
3185 const struct lttng_kernel_event_field *field,
3186 size_t nesting)
3187 {
3188 int ret;
3189
3190 ret = _lttng_struct_type_statedump(session,
3191 lttng_kernel_get_type_struct(field->type), nesting);
3192 if (ret)
3193 return ret;
3194 return lttng_field_name_statedump(session, field, nesting);
3195 }
3196
3197 /*
3198 * Must be called with sessions_mutex held.
3199 */
3200 static
3201 int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
3202 const struct lttng_kernel_type_variant *type,
3203 size_t nesting,
3204 const char *prev_field_name)
3205 {
3206 const char *tag_name;
3207 int ret;
3208 uint32_t i, nr_choices;
3209
3210 tag_name = type->tag_name;
3211 if (!tag_name)
3212 tag_name = prev_field_name;
3213 if (!tag_name)
3214 return -EINVAL;
3215 /*
3216 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3217 */
3218 if (type->alignment != 0)
3219 return -EINVAL;
3220 ret = print_tabs(session, nesting);
3221 if (ret)
3222 return ret;
3223 ret = lttng_metadata_printf(session,
3224 "variant <_%s> {\n",
3225 tag_name);
3226 if (ret)
3227 return ret;
3228 nr_choices = type->nr_choices;
3229 for (i = 0; i < nr_choices; i++) {
3230 const struct lttng_kernel_event_field *iter_field;
3231
3232 iter_field = type->choices[i];
3233 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
3234 if (ret)
3235 return ret;
3236 }
3237 ret = print_tabs(session, nesting);
3238 if (ret)
3239 return ret;
3240 ret = lttng_metadata_printf(session,
3241 "}");
3242 return ret;
3243 }
3244
3245 /*
3246 * Must be called with sessions_mutex held.
3247 */
3248 static
3249 int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
3250 const struct lttng_kernel_event_field *field,
3251 size_t nesting,
3252 const char *prev_field_name)
3253 {
3254 int ret;
3255
3256 ret = _lttng_variant_type_statedump(session,
3257 lttng_kernel_get_type_variant(field->type), nesting,
3258 prev_field_name);
3259 if (ret)
3260 return ret;
3261 return lttng_field_name_statedump(session, field, nesting);
3262 }
3263
3264 /*
3265 * Must be called with sessions_mutex held.
3266 */
3267 static
3268 int _lttng_array_field_statedump(struct lttng_kernel_session *session,
3269 const struct lttng_kernel_event_field *field,
3270 size_t nesting)
3271 {
3272 int ret;
3273 const struct lttng_kernel_type_array *array_type;
3274 const struct lttng_kernel_type_common *elem_type;
3275
3276 array_type = lttng_kernel_get_type_array(field->type);
3277 WARN_ON_ONCE(!array_type);
3278
3279 if (array_type->alignment) {
3280 ret = print_tabs(session, nesting);
3281 if (ret)
3282 return ret;
3283 ret = lttng_metadata_printf(session,
3284 "struct { } align(%u) _%s_padding;\n",
3285 array_type->alignment * CHAR_BIT,
3286 field->name);
3287 if (ret)
3288 return ret;
3289 }
3290 /*
3291 * Nested compound types: Only array of structures and variants are
3292 * currently supported.
3293 */
3294 elem_type = array_type->elem_type;
3295 switch (elem_type->type) {
3296 case lttng_kernel_type_integer:
3297 case lttng_kernel_type_struct:
3298 case lttng_kernel_type_variant:
3299 ret = _lttng_type_statedump(session, elem_type,
3300 array_type->encoding, nesting);
3301 if (ret)
3302 return ret;
3303 break;
3304
3305 default:
3306 return -EINVAL;
3307 }
3308 ret = lttng_metadata_printf(session,
3309 " _%s[%u];\n",
3310 field->name,
3311 array_type->length);
3312 return ret;
3313 }
3314
3315 /*
3316 * Must be called with sessions_mutex held.
3317 */
3318 static
3319 int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
3320 const struct lttng_kernel_event_field *field,
3321 size_t nesting,
3322 const char *prev_field_name)
3323 {
3324 int ret;
3325 const char *length_name;
3326 const struct lttng_kernel_type_sequence *sequence_type;
3327 const struct lttng_kernel_type_common *elem_type;
3328
3329 sequence_type = lttng_kernel_get_type_sequence(field->type);
3330 WARN_ON_ONCE(!sequence_type);
3331
3332 length_name = sequence_type->length_name;
3333 if (!length_name)
3334 length_name = prev_field_name;
3335 if (!length_name)
3336 return -EINVAL;
3337
3338 if (sequence_type->alignment) {
3339 ret = print_tabs(session, nesting);
3340 if (ret)
3341 return ret;
3342 ret = lttng_metadata_printf(session,
3343 "struct { } align(%u) _%s_padding;\n",
3344 sequence_type->alignment * CHAR_BIT,
3345 field->name);
3346 if (ret)
3347 return ret;
3348 }
3349
3350 /*
3351 * Nested compound types: Only array of structures and variants are
3352 * currently supported.
3353 */
3354 elem_type = sequence_type->elem_type;
3355 switch (elem_type->type) {
3356 case lttng_kernel_type_integer:
3357 case lttng_kernel_type_struct:
3358 case lttng_kernel_type_variant:
3359 ret = _lttng_type_statedump(session, elem_type,
3360 sequence_type->encoding, nesting);
3361 if (ret)
3362 return ret;
3363 break;
3364
3365 default:
3366 return -EINVAL;
3367 }
3368 ret = lttng_metadata_printf(session,
3369 " _%s[ _%s ];\n",
3370 field->name,
3371 length_name);
3372 return ret;
3373 }
3374
3375 /*
3376 * Must be called with sessions_mutex held.
3377 */
3378 static
3379 int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
3380 const struct lttng_kernel_type_enum *type,
3381 size_t nesting)
3382 {
3383 const struct lttng_kernel_enum_desc *enum_desc;
3384 const struct lttng_kernel_type_common *container_type;
3385 int ret;
3386 unsigned int i, nr_entries;
3387
3388 container_type = type->container_type;
3389 if (container_type->type != lttng_kernel_type_integer) {
3390 ret = -EINVAL;
3391 goto end;
3392 }
3393 enum_desc = type->desc;
3394 nr_entries = enum_desc->nr_entries;
3395
3396 ret = print_tabs(session, nesting);
3397 if (ret)
3398 goto end;
3399 ret = lttng_metadata_printf(session, "enum : ");
3400 if (ret)
3401 goto end;
3402 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3403 lttng_kernel_string_encoding_none, 0);
3404 if (ret)
3405 goto end;
3406 ret = lttng_metadata_printf(session, " {\n");
3407 if (ret)
3408 goto end;
3409 /* Dump all entries */
3410 for (i = 0; i < nr_entries; i++) {
3411 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
3412 int j, len;
3413
3414 ret = print_tabs(session, nesting + 1);
3415 if (ret)
3416 goto end;
3417 ret = lttng_metadata_printf(session,
3418 "\"");
3419 if (ret)
3420 goto end;
3421 len = strlen(entry->string);
3422 /* Escape the character '"' */
3423 for (j = 0; j < len; j++) {
3424 char c = entry->string[j];
3425
3426 switch (c) {
3427 case '"':
3428 ret = lttng_metadata_printf(session,
3429 "\\\"");
3430 break;
3431 case '\\':
3432 ret = lttng_metadata_printf(session,
3433 "\\\\");
3434 break;
3435 default:
3436 ret = lttng_metadata_printf(session,
3437 "%c", c);
3438 break;
3439 }
3440 if (ret)
3441 goto end;
3442 }
3443 ret = lttng_metadata_printf(session, "\"");
3444 if (ret)
3445 goto end;
3446
3447 if (entry->options.is_auto) {
3448 ret = lttng_metadata_printf(session, ",\n");
3449 if (ret)
3450 goto end;
3451 } else {
3452 ret = lttng_metadata_printf(session,
3453 " = ");
3454 if (ret)
3455 goto end;
3456 if (entry->start.signedness)
3457 ret = lttng_metadata_printf(session,
3458 "%lld", (long long) entry->start.value);
3459 else
3460 ret = lttng_metadata_printf(session,
3461 "%llu", entry->start.value);
3462 if (ret)
3463 goto end;
3464 if (entry->start.signedness == entry->end.signedness &&
3465 entry->start.value
3466 == entry->end.value) {
3467 ret = lttng_metadata_printf(session,
3468 ",\n");
3469 } else {
3470 if (entry->end.signedness) {
3471 ret = lttng_metadata_printf(session,
3472 " ... %lld,\n",
3473 (long long) entry->end.value);
3474 } else {
3475 ret = lttng_metadata_printf(session,
3476 " ... %llu,\n",
3477 entry->end.value);
3478 }
3479 }
3480 if (ret)
3481 goto end;
3482 }
3483 }
3484 ret = print_tabs(session, nesting);
3485 if (ret)
3486 goto end;
3487 ret = lttng_metadata_printf(session, "}");
3488 end:
3489 return ret;
3490 }
3491
3492 /*
3493 * Must be called with sessions_mutex held.
3494 */
3495 static
3496 int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
3497 const struct lttng_kernel_event_field *field,
3498 size_t nesting)
3499 {
3500 int ret;
3501 const struct lttng_kernel_type_enum *enum_type;
3502
3503 enum_type = lttng_kernel_get_type_enum(field->type);
3504 WARN_ON_ONCE(!enum_type);
3505 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
3506 if (ret)
3507 return ret;
3508 return lttng_field_name_statedump(session, field, nesting);
3509 }
3510
3511 static
3512 int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
3513 const struct lttng_kernel_event_field *field,
3514 size_t nesting)
3515 {
3516 int ret;
3517
3518 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3519 lttng_kernel_string_encoding_none, nesting);
3520 if (ret)
3521 return ret;
3522 return lttng_field_name_statedump(session, field, nesting);
3523 }
3524
3525 static
3526 int _lttng_string_type_statedump(struct lttng_kernel_session *session,
3527 const struct lttng_kernel_type_string *type,
3528 size_t nesting)
3529 {
3530 int ret;
3531
3532 /* Default encoding is UTF8 */
3533 ret = print_tabs(session, nesting);
3534 if (ret)
3535 return ret;
3536 ret = lttng_metadata_printf(session,
3537 "string%s",
3538 type->encoding == lttng_kernel_string_encoding_ASCII ?
3539 " { encoding = ASCII; }" : "");
3540 return ret;
3541 }
3542
3543 static
3544 int _lttng_string_field_statedump(struct lttng_kernel_session *session,
3545 const struct lttng_kernel_event_field *field,
3546 size_t nesting)
3547 {
3548 const struct lttng_kernel_type_string *string_type;
3549 int ret;
3550
3551 string_type = lttng_kernel_get_type_string(field->type);
3552 WARN_ON_ONCE(!string_type);
3553 ret = _lttng_string_type_statedump(session, string_type, nesting);
3554 if (ret)
3555 return ret;
3556 return lttng_field_name_statedump(session, field, nesting);
3557 }
3558
3559 /*
3560 * Must be called with sessions_mutex held.
3561 */
3562 static
3563 int _lttng_type_statedump(struct lttng_kernel_session *session,
3564 const struct lttng_kernel_type_common *type,
3565 enum lttng_kernel_string_encoding parent_encoding,
3566 size_t nesting)
3567 {
3568 int ret = 0;
3569
3570 switch (type->type) {
3571 case lttng_kernel_type_integer:
3572 ret = _lttng_integer_type_statedump(session,
3573 lttng_kernel_get_type_integer(type),
3574 parent_encoding, nesting);
3575 break;
3576 case lttng_kernel_type_enum:
3577 ret = _lttng_enum_type_statedump(session,
3578 lttng_kernel_get_type_enum(type),
3579 nesting);
3580 break;
3581 case lttng_kernel_type_string:
3582 ret = _lttng_string_type_statedump(session,
3583 lttng_kernel_get_type_string(type),
3584 nesting);
3585 break;
3586 case lttng_kernel_type_struct:
3587 ret = _lttng_struct_type_statedump(session,
3588 lttng_kernel_get_type_struct(type),
3589 nesting);
3590 break;
3591 case lttng_kernel_type_variant:
3592 ret = _lttng_variant_type_statedump(session,
3593 lttng_kernel_get_type_variant(type),
3594 nesting, NULL);
3595 break;
3596
3597 /* Nested arrays and sequences are not supported yet. */
3598 case lttng_kernel_type_array:
3599 case lttng_kernel_type_sequence:
3600 default:
3601 WARN_ON_ONCE(1);
3602 return -EINVAL;
3603 }
3604 return ret;
3605 }
3606
3607 /*
3608 * Must be called with sessions_mutex held.
3609 */
3610 static
3611 int _lttng_field_statedump(struct lttng_kernel_session *session,
3612 const struct lttng_kernel_event_field *field,
3613 size_t nesting,
3614 const char **prev_field_name_p)
3615 {
3616 const char *prev_field_name = NULL;
3617 int ret = 0;
3618
3619 if (prev_field_name_p)
3620 prev_field_name = *prev_field_name_p;
3621 switch (field->type->type) {
3622 case lttng_kernel_type_integer:
3623 ret = _lttng_integer_field_statedump(session, field, nesting);
3624 break;
3625 case lttng_kernel_type_enum:
3626 ret = _lttng_enum_field_statedump(session, field, nesting);
3627 break;
3628 case lttng_kernel_type_string:
3629 ret = _lttng_string_field_statedump(session, field, nesting);
3630 break;
3631 case lttng_kernel_type_struct:
3632 ret = _lttng_struct_field_statedump(session, field, nesting);
3633 break;
3634 case lttng_kernel_type_array:
3635 ret = _lttng_array_field_statedump(session, field, nesting);
3636 break;
3637 case lttng_kernel_type_sequence:
3638 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
3639 break;
3640 case lttng_kernel_type_variant:
3641 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
3642 break;
3643
3644 default:
3645 WARN_ON_ONCE(1);
3646 return -EINVAL;
3647 }
3648 if (prev_field_name_p)
3649 *prev_field_name_p = field->name;
3650 return ret;
3651 }
3652
3653 static
3654 int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
3655 struct lttng_kernel_ctx *ctx)
3656 {
3657 const char *prev_field_name = NULL;
3658 int ret = 0;
3659 int i;
3660
3661 if (!ctx)
3662 return 0;
3663 for (i = 0; i < ctx->nr_fields; i++) {
3664 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
3665
3666 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
3667 if (ret)
3668 return ret;
3669 }
3670 return ret;
3671 }
3672
3673 static
3674 int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
3675 struct lttng_kernel_event_recorder *event_recorder)
3676 {
3677 const char *prev_field_name = NULL;
3678 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
3679 int ret = 0;
3680 int i;
3681
3682 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3683 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
3684
3685 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
3686 if (ret)
3687 return ret;
3688 }
3689 return ret;
3690 }
3691
3692 /*
3693 * Must be called with sessions_mutex held.
3694 * The entire event metadata is printed as a single atomic metadata
3695 * transaction.
3696 */
3697 static
3698 int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
3699 struct lttng_kernel_channel_buffer *chan,
3700 struct lttng_kernel_event_recorder *event_recorder)
3701 {
3702 int ret = 0;
3703
3704 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3705 return 0;
3706 if (chan->priv->channel_type == METADATA_CHANNEL)
3707 return 0;
3708
3709 lttng_metadata_begin(session);
3710
3711 ret = lttng_metadata_printf(session,
3712 "event {\n"
3713 " name = \"%s\";\n"
3714 " id = %u;\n"
3715 " stream_id = %u;\n",
3716 event_recorder->priv->parent.desc->event_name,
3717 event_recorder->priv->id,
3718 event_recorder->chan->priv->id);
3719 if (ret)
3720 goto end;
3721
3722 ret = lttng_metadata_printf(session,
3723 " fields := struct {\n"
3724 );
3725 if (ret)
3726 goto end;
3727
3728 ret = _lttng_fields_metadata_statedump(session, event_recorder);
3729 if (ret)
3730 goto end;
3731
3732 /*
3733 * LTTng space reservation can only reserve multiples of the
3734 * byte size.
3735 */
3736 ret = lttng_metadata_printf(session,
3737 " };\n"
3738 "};\n\n");
3739 if (ret)
3740 goto end;
3741
3742 event_recorder->priv->metadata_dumped = 1;
3743 end:
3744 lttng_metadata_end(session);
3745 return ret;
3746
3747 }
3748
3749 /*
3750 * Must be called with sessions_mutex held.
3751 * The entire channel metadata is printed as a single atomic metadata
3752 * transaction.
3753 */
3754 static
3755 int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
3756 struct lttng_kernel_channel_buffer *chan)
3757 {
3758 int ret = 0;
3759
3760 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3761 return 0;
3762
3763 if (chan->priv->channel_type == METADATA_CHANNEL)
3764 return 0;
3765
3766 lttng_metadata_begin(session);
3767
3768 WARN_ON_ONCE(!chan->priv->header_type);
3769 ret = lttng_metadata_printf(session,
3770 "stream {\n"
3771 " id = %u;\n"
3772 " event.header := %s;\n"
3773 " packet.context := struct packet_context;\n",
3774 chan->priv->id,
3775 chan->priv->header_type == 1 ? "struct event_header_compact" :
3776 "struct event_header_large");
3777 if (ret)
3778 goto end;
3779
3780 if (chan->priv->ctx) {
3781 ret = lttng_metadata_printf(session,
3782 " event.context := struct {\n");
3783 if (ret)
3784 goto end;
3785 }
3786 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
3787 if (ret)
3788 goto end;
3789 if (chan->priv->ctx) {
3790 ret = lttng_metadata_printf(session,
3791 " };\n");
3792 if (ret)
3793 goto end;
3794 }
3795
3796 ret = lttng_metadata_printf(session,
3797 "};\n\n");
3798
3799 chan->priv->metadata_dumped = 1;
3800 end:
3801 lttng_metadata_end(session);
3802 return ret;
3803 }
3804
3805 /*
3806 * Must be called with sessions_mutex held.
3807 */
3808 static
3809 int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
3810 {
3811 return lttng_metadata_printf(session,
3812 "struct packet_context {\n"
3813 " uint64_clock_monotonic_t timestamp_begin;\n"
3814 " uint64_clock_monotonic_t timestamp_end;\n"
3815 " uint64_t content_size;\n"
3816 " uint64_t packet_size;\n"
3817 " uint64_t packet_seq_num;\n"
3818 " unsigned long events_discarded;\n"
3819 " uint32_t cpu_id;\n"
3820 "};\n\n"
3821 );
3822 }
3823
3824 /*
3825 * Compact header:
3826 * id: range: 0 - 30.
3827 * id 31 is reserved to indicate an extended header.
3828 *
3829 * Large header:
3830 * id: range: 0 - 65534.
3831 * id 65535 is reserved to indicate an extended header.
3832 *
3833 * Must be called with sessions_mutex held.
3834 */
3835 static
3836 int _lttng_event_header_declare(struct lttng_kernel_session *session)
3837 {
3838 return lttng_metadata_printf(session,
3839 "struct event_header_compact {\n"
3840 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3841 " variant <id> {\n"
3842 " struct {\n"
3843 " uint27_clock_monotonic_t timestamp;\n"
3844 " } compact;\n"
3845 " struct {\n"
3846 " uint32_t id;\n"
3847 " uint64_clock_monotonic_t timestamp;\n"
3848 " } extended;\n"
3849 " } v;\n"
3850 "} align(%u);\n"
3851 "\n"
3852 "struct event_header_large {\n"
3853 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3854 " variant <id> {\n"
3855 " struct {\n"
3856 " uint32_clock_monotonic_t timestamp;\n"
3857 " } compact;\n"
3858 " struct {\n"
3859 " uint32_t id;\n"
3860 " uint64_clock_monotonic_t timestamp;\n"
3861 " } extended;\n"
3862 " } v;\n"
3863 "} align(%u);\n\n",
3864 lttng_alignof(uint32_t) * CHAR_BIT,
3865 lttng_alignof(uint16_t) * CHAR_BIT
3866 );
3867 }
3868
3869 /*
3870 * Approximation of NTP time of day to clock monotonic correlation,
3871 * taken at start of trace.
3872 * Yes, this is only an approximation. Yes, we can (and will) do better
3873 * in future versions.
3874 * This function may return a negative offset. It may happen if the
3875 * system sets the REALTIME clock to 0 after boot.
3876 *
3877 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3878 * y2038 compliant.
3879 */
3880 static
3881 int64_t measure_clock_offset(void)
3882 {
3883 uint64_t monotonic_avg, monotonic[2], realtime;
3884 uint64_t tcf = trace_clock_freq();
3885 int64_t offset;
3886 unsigned long flags;
3887 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3888 struct timespec64 rts = { 0, 0 };
3889 #else
3890 struct timespec rts = { 0, 0 };
3891 #endif
3892
3893 /* Disable interrupts to increase correlation precision. */
3894 local_irq_save(flags);
3895 monotonic[0] = trace_clock_read64();
3896 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3897 ktime_get_real_ts64(&rts);
3898 #else
3899 getnstimeofday(&rts);
3900 #endif
3901 monotonic[1] = trace_clock_read64();
3902 local_irq_restore(flags);
3903
3904 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
3905 realtime = (uint64_t) rts.tv_sec * tcf;
3906 if (tcf == NSEC_PER_SEC) {
3907 realtime += rts.tv_nsec;
3908 } else {
3909 uint64_t n = rts.tv_nsec * tcf;
3910
3911 do_div(n, NSEC_PER_SEC);
3912 realtime += n;
3913 }
3914 offset = (int64_t) realtime - monotonic_avg;
3915 return offset;
3916 }
3917
3918 static
3919 int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3920 {
3921 int ret = 0;
3922 size_t i;
3923 char cur;
3924
3925 i = 0;
3926 cur = string[i];
3927 while (cur != '\0') {
3928 switch (cur) {
3929 case '\n':
3930 ret = lttng_metadata_printf(session, "%s", "\\n");
3931 break;
3932 case '\\':
3933 case '"':
3934 ret = lttng_metadata_printf(session, "%c", '\\');
3935 if (ret)
3936 goto error;
3937 /* We still print the current char */
3938 lttng_fallthrough;
3939 default:
3940 ret = lttng_metadata_printf(session, "%c", cur);
3941 break;
3942 }
3943
3944 if (ret)
3945 goto error;
3946
3947 cur = string[++i];
3948 }
3949 error:
3950 return ret;
3951 }
3952
3953 static
3954 int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
3955 const char *field_value)
3956 {
3957 int ret;
3958
3959 ret = lttng_metadata_printf(session, " %s = \"", field);
3960 if (ret)
3961 goto error;
3962
3963 ret = print_escaped_ctf_string(session, field_value);
3964 if (ret)
3965 goto error;
3966
3967 ret = lttng_metadata_printf(session, "\";\n");
3968
3969 error:
3970 return ret;
3971 }
3972
3973 /*
3974 * Output metadata into this session's metadata buffers.
3975 * Must be called with sessions_mutex held.
3976 */
3977 static
3978 int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
3979 {
3980 unsigned char *uuid_c = session->priv->uuid.b;
3981 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
3982 const char *product_uuid;
3983 struct lttng_kernel_channel_buffer_private *chan_priv;
3984 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3985 int ret = 0;
3986
3987 if (!LTTNG_READ_ONCE(session->active))
3988 return 0;
3989
3990 lttng_metadata_begin(session);
3991
3992 if (session->priv->metadata_dumped)
3993 goto skip_session;
3994
3995 snprintf(uuid_s, sizeof(uuid_s),
3996 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3997 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3998 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3999 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
4000 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
4001
4002 ret = lttng_metadata_printf(session,
4003 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4004 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4005 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4006 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4007 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4008 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4009 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4010 "\n"
4011 "trace {\n"
4012 " major = %u;\n"
4013 " minor = %u;\n"
4014 " uuid = \"%s\";\n"
4015 " byte_order = %s;\n"
4016 " packet.header := struct {\n"
4017 " uint32_t magic;\n"
4018 " uint8_t uuid[16];\n"
4019 " uint32_t stream_id;\n"
4020 " uint64_t stream_instance_id;\n"
4021 " };\n"
4022 "};\n\n",
4023 lttng_alignof(uint8_t) * CHAR_BIT,
4024 lttng_alignof(uint16_t) * CHAR_BIT,
4025 lttng_alignof(uint32_t) * CHAR_BIT,
4026 lttng_alignof(uint64_t) * CHAR_BIT,
4027 sizeof(unsigned long) * CHAR_BIT,
4028 lttng_alignof(unsigned long) * CHAR_BIT,
4029 CTF_SPEC_MAJOR,
4030 CTF_SPEC_MINOR,
4031 uuid_s,
4032 #if __BYTE_ORDER == __BIG_ENDIAN
4033 "be"
4034 #else
4035 "le"
4036 #endif
4037 );
4038 if (ret)
4039 goto end;
4040
4041 ret = lttng_metadata_printf(session,
4042 "env {\n"
4043 " hostname = \"%s\";\n"
4044 " domain = \"kernel\";\n"
4045 " sysname = \"%s\";\n"
4046 " kernel_release = \"%s\";\n"
4047 " kernel_version = \"%s\";\n"
4048 " tracer_name = \"lttng-modules\";\n"
4049 " tracer_major = %d;\n"
4050 " tracer_minor = %d;\n"
4051 " tracer_patchlevel = %d;\n"
4052 " trace_buffering_scheme = \"global\";\n",
4053 current->nsproxy->uts_ns->name.nodename,
4054 utsname()->sysname,
4055 utsname()->release,
4056 utsname()->version,
4057 LTTNG_MODULES_MAJOR_VERSION,
4058 LTTNG_MODULES_MINOR_VERSION,
4059 LTTNG_MODULES_PATCHLEVEL_VERSION
4060 );
4061 if (ret)
4062 goto end;
4063
4064 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
4065 if (ret)
4066 goto end;
4067 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
4068 session->priv->creation_time);
4069 if (ret)
4070 goto end;
4071
4072 /* Add the product UUID to the 'env' section */
4073 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4074 if (product_uuid) {
4075 ret = lttng_metadata_printf(session,
4076 " product_uuid = \"%s\";\n",
4077 product_uuid
4078 );
4079 if (ret)
4080 goto end;
4081 }
4082
4083 /* Close the 'env' section */
4084 ret = lttng_metadata_printf(session, "};\n\n");
4085 if (ret)
4086 goto end;
4087
4088 ret = lttng_metadata_printf(session,
4089 "clock {\n"
4090 " name = \"%s\";\n",
4091 trace_clock_name()
4092 );
4093 if (ret)
4094 goto end;
4095
4096 if (!trace_clock_uuid(clock_uuid_s)) {
4097 ret = lttng_metadata_printf(session,
4098 " uuid = \"%s\";\n",
4099 clock_uuid_s
4100 );
4101 if (ret)
4102 goto end;
4103 }
4104
4105 ret = lttng_metadata_printf(session,
4106 " description = \"%s\";\n"
4107 " freq = %llu; /* Frequency, in Hz */\n"
4108 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4109 " offset = %lld;\n"
4110 "};\n\n",
4111 trace_clock_description(),
4112 (unsigned long long) trace_clock_freq(),
4113 (long long) measure_clock_offset()
4114 );
4115 if (ret)
4116 goto end;
4117
4118 ret = lttng_metadata_printf(session,
4119 "typealias integer {\n"
4120 " size = 27; align = 1; signed = false;\n"
4121 " map = clock.%s.value;\n"
4122 "} := uint27_clock_monotonic_t;\n"
4123 "\n"
4124 "typealias integer {\n"
4125 " size = 32; align = %u; signed = false;\n"
4126 " map = clock.%s.value;\n"
4127 "} := uint32_clock_monotonic_t;\n"
4128 "\n"
4129 "typealias integer {\n"
4130 " size = 64; align = %u; signed = false;\n"
4131 " map = clock.%s.value;\n"
4132 "} := uint64_clock_monotonic_t;\n\n",
4133 trace_clock_name(),
4134 lttng_alignof(uint32_t) * CHAR_BIT,
4135 trace_clock_name(),
4136 lttng_alignof(uint64_t) * CHAR_BIT,
4137 trace_clock_name()
4138 );
4139 if (ret)
4140 goto end;
4141
4142 ret = _lttng_stream_packet_context_declare(session);
4143 if (ret)
4144 goto end;
4145
4146 ret = _lttng_event_header_declare(session);
4147 if (ret)
4148 goto end;
4149
4150 skip_session:
4151 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4152 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
4153 if (ret)
4154 goto end;
4155 }
4156
4157 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
4158 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4159 event_recorder_priv->pub);
4160 if (ret)
4161 goto end;
4162 }
4163 session->priv->metadata_dumped = 1;
4164 end:
4165 lttng_metadata_end(session);
4166 return ret;
4167 }
4168
4169 /**
4170 * lttng_transport_register - LTT transport registration
4171 * @transport: transport structure
4172 *
4173 * Registers a transport which can be used as output to extract the data out of
4174 * LTTng. The module calling this registration function must ensure that no
4175 * trap-inducing code will be executed by the transport functions. E.g.
4176 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4177 * is made visible to the transport function. This registration acts as a
4178 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4179 * after its registration must it synchronize the TLBs.
4180 */
4181 void lttng_transport_register(struct lttng_transport *transport)
4182 {
4183 /*
4184 * Make sure no page fault can be triggered by the module about to be
4185 * registered. We deal with this here so we don't have to call
4186 * vmalloc_sync_mappings() in each module's init.
4187 */
4188 wrapper_vmalloc_sync_mappings();
4189
4190 mutex_lock(&sessions_mutex);
4191 list_add_tail(&transport->node, &lttng_transport_list);
4192 mutex_unlock(&sessions_mutex);
4193 }
4194 EXPORT_SYMBOL_GPL(lttng_transport_register);
4195
4196 /**
4197 * lttng_transport_unregister - LTT transport unregistration
4198 * @transport: transport structure
4199 */
4200 void lttng_transport_unregister(struct lttng_transport *transport)
4201 {
4202 mutex_lock(&sessions_mutex);
4203 list_del(&transport->node);
4204 mutex_unlock(&sessions_mutex);
4205 }
4206 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
4207
4208 void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4209 {
4210 /*
4211 * Make sure no page fault can be triggered by the module about to be
4212 * registered. We deal with this here so we don't have to call
4213 * vmalloc_sync_mappings() in each module's init.
4214 */
4215 wrapper_vmalloc_sync_mappings();
4216
4217 mutex_lock(&sessions_mutex);
4218 list_add_tail(&transport->node, &lttng_counter_transport_list);
4219 mutex_unlock(&sessions_mutex);
4220 }
4221 EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4222
4223 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4224 {
4225 mutex_lock(&sessions_mutex);
4226 list_del(&transport->node);
4227 mutex_unlock(&sessions_mutex);
4228 }
4229 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4230
4231 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4232
4233 enum cpuhp_state lttng_hp_prepare;
4234 enum cpuhp_state lttng_hp_online;
4235
4236 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4237 {
4238 struct lttng_cpuhp_node *lttng_node;
4239
4240 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4241 switch (lttng_node->component) {
4242 case LTTNG_RING_BUFFER_FRONTEND:
4243 return 0;
4244 case LTTNG_RING_BUFFER_BACKEND:
4245 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4246 case LTTNG_RING_BUFFER_ITER:
4247 return 0;
4248 case LTTNG_CONTEXT_PERF_COUNTERS:
4249 return 0;
4250 default:
4251 return -EINVAL;
4252 }
4253 }
4254
4255 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4256 {
4257 struct lttng_cpuhp_node *lttng_node;
4258
4259 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4260 switch (lttng_node->component) {
4261 case LTTNG_RING_BUFFER_FRONTEND:
4262 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4263 case LTTNG_RING_BUFFER_BACKEND:
4264 return 0;
4265 case LTTNG_RING_BUFFER_ITER:
4266 return 0;
4267 case LTTNG_CONTEXT_PERF_COUNTERS:
4268 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4269 default:
4270 return -EINVAL;
4271 }
4272 }
4273
4274 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4275 {
4276 struct lttng_cpuhp_node *lttng_node;
4277
4278 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4279 switch (lttng_node->component) {
4280 case LTTNG_RING_BUFFER_FRONTEND:
4281 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4282 case LTTNG_RING_BUFFER_BACKEND:
4283 return 0;
4284 case LTTNG_RING_BUFFER_ITER:
4285 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4286 case LTTNG_CONTEXT_PERF_COUNTERS:
4287 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4288 default:
4289 return -EINVAL;
4290 }
4291 }
4292
4293 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4294 {
4295 struct lttng_cpuhp_node *lttng_node;
4296
4297 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4298 switch (lttng_node->component) {
4299 case LTTNG_RING_BUFFER_FRONTEND:
4300 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4301 case LTTNG_RING_BUFFER_BACKEND:
4302 return 0;
4303 case LTTNG_RING_BUFFER_ITER:
4304 return 0;
4305 case LTTNG_CONTEXT_PERF_COUNTERS:
4306 return 0;
4307 default:
4308 return -EINVAL;
4309 }
4310 }
4311
4312 static int __init lttng_init_cpu_hotplug(void)
4313 {
4314 int ret;
4315
4316 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4317 lttng_hotplug_prepare,
4318 lttng_hotplug_dead);
4319 if (ret < 0) {
4320 return ret;
4321 }
4322 lttng_hp_prepare = ret;
4323 lttng_rb_set_hp_prepare(ret);
4324
4325 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4326 lttng_hotplug_online,
4327 lttng_hotplug_offline);
4328 if (ret < 0) {
4329 cpuhp_remove_multi_state(lttng_hp_prepare);
4330 lttng_hp_prepare = 0;
4331 return ret;
4332 }
4333 lttng_hp_online = ret;
4334 lttng_rb_set_hp_online(ret);
4335
4336 return 0;
4337 }
4338
4339 static void __exit lttng_exit_cpu_hotplug(void)
4340 {
4341 lttng_rb_set_hp_online(0);
4342 cpuhp_remove_multi_state(lttng_hp_online);
4343 lttng_rb_set_hp_prepare(0);
4344 cpuhp_remove_multi_state(lttng_hp_prepare);
4345 }
4346
4347 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4348 static int lttng_init_cpu_hotplug(void)
4349 {
4350 return 0;
4351 }
4352 static void lttng_exit_cpu_hotplug(void)
4353 {
4354 }
4355 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4356
4357 static int __init lttng_events_init(void)
4358 {
4359 int ret;
4360
4361 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4362 if (ret)
4363 return ret;
4364 ret = wrapper_get_pfnblock_flags_mask_init();
4365 if (ret)
4366 return ret;
4367 ret = wrapper_get_pageblock_flags_mask_init();
4368 if (ret)
4369 return ret;
4370 ret = lttng_probes_init();
4371 if (ret)
4372 return ret;
4373 ret = lttng_context_init();
4374 if (ret)
4375 return ret;
4376 ret = lttng_tracepoint_init();
4377 if (ret)
4378 goto error_tp;
4379 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4380 if (!event_recorder_cache) {
4381 ret = -ENOMEM;
4382 goto error_kmem_event_recorder;
4383 }
4384 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4385 if (!event_recorder_private_cache) {
4386 ret = -ENOMEM;
4387 goto error_kmem_event_recorder_private;
4388 }
4389 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
4390 if (!event_notifier_cache) {
4391 ret = -ENOMEM;
4392 goto error_kmem_event_notifier;
4393 }
4394 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4395 if (!event_notifier_private_cache) {
4396 ret = -ENOMEM;
4397 goto error_kmem_event_notifier_private;
4398 }
4399 ret = lttng_abi_init();
4400 if (ret)
4401 goto error_abi;
4402 ret = lttng_logger_init();
4403 if (ret)
4404 goto error_logger;
4405 ret = lttng_init_cpu_hotplug();
4406 if (ret)
4407 goto error_hotplug;
4408 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4409 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4410 __stringify(LTTNG_MODULES_MINOR_VERSION),
4411 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4412 LTTNG_MODULES_EXTRAVERSION,
4413 LTTNG_VERSION_NAME,
4414 #ifdef LTTNG_EXTRA_VERSION_GIT
4415 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4416 #else
4417 "",
4418 #endif
4419 #ifdef LTTNG_EXTRA_VERSION_NAME
4420 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4421 #else
4422 "");
4423 #endif
4424 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4425 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4426 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4427 return 0;
4428
4429 error_hotplug:
4430 lttng_logger_exit();
4431 error_logger:
4432 lttng_abi_exit();
4433 error_abi:
4434 kmem_cache_destroy(event_notifier_private_cache);
4435 error_kmem_event_notifier_private:
4436 kmem_cache_destroy(event_notifier_cache);
4437 error_kmem_event_notifier:
4438 kmem_cache_destroy(event_recorder_private_cache);
4439 error_kmem_event_recorder_private:
4440 kmem_cache_destroy(event_recorder_cache);
4441 error_kmem_event_recorder:
4442 lttng_tracepoint_exit();
4443 error_tp:
4444 lttng_context_exit();
4445 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4446 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4447 __stringify(LTTNG_MODULES_MINOR_VERSION),
4448 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4449 LTTNG_MODULES_EXTRAVERSION,
4450 LTTNG_VERSION_NAME,
4451 #ifdef LTTNG_EXTRA_VERSION_GIT
4452 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4453 #else
4454 "",
4455 #endif
4456 #ifdef LTTNG_EXTRA_VERSION_NAME
4457 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4458 #else
4459 "");
4460 #endif
4461 return ret;
4462 }
4463
4464 module_init(lttng_events_init);
4465
4466 static void __exit lttng_events_exit(void)
4467 {
4468 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
4469
4470 lttng_exit_cpu_hotplug();
4471 lttng_logger_exit();
4472 lttng_abi_exit();
4473 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4474 lttng_session_destroy(session_priv->pub);
4475 kmem_cache_destroy(event_recorder_cache);
4476 kmem_cache_destroy(event_recorder_private_cache);
4477 kmem_cache_destroy(event_notifier_cache);
4478 kmem_cache_destroy(event_notifier_private_cache);
4479 lttng_tracepoint_exit();
4480 lttng_context_exit();
4481 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4482 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4483 __stringify(LTTNG_MODULES_MINOR_VERSION),
4484 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4485 LTTNG_MODULES_EXTRAVERSION,
4486 LTTNG_VERSION_NAME,
4487 #ifdef LTTNG_EXTRA_VERSION_GIT
4488 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4489 #else
4490 "",
4491 #endif
4492 #ifdef LTTNG_EXTRA_VERSION_NAME
4493 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4494 #else
4495 "");
4496 #endif
4497 }
4498
4499 module_exit(lttng_events_exit);
4500
4501 #include <generated/patches.h>
4502 #ifdef LTTNG_EXTRA_VERSION_GIT
4503 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4504 #endif
4505 #ifdef LTTNG_EXTRA_VERSION_NAME
4506 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4507 #endif
4508 MODULE_LICENSE("GPL and additional rights");
4509 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4510 MODULE_DESCRIPTION("LTTng tracer");
4511 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4512 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
4513 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4514 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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