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Combine event recorder and notifier destroy
[lttng-modules.git] / src / lttng-events.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
a90917c3 3 * lttng-events.c
4e3c1b9b 4 *
4e3c1b9b 5 * Holds LTTng per-session event registry.
17baffe2 6 *
886d51a3 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4e3c1b9b
MD		 8 */
9
389d7070
MD		 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
4e3c1b9b 16#include <linux/module.h>
c0e31d2e
MD		 17#include <linux/mutex.h>
18#include <linux/sched.h>
11b5a3c2 19#include <linux/slab.h>
c099397a 20#include <linux/jiffies.h>
99dc9597 21#include <linux/utsname.h>
abc0446a 22#include <linux/err.h>
7e6f9ef6
MD		 23#include <linux/seq_file.h>
24#include <linux/file.h>
25#include <linux/anon_inodes.h>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
a7008254 31#include <wrapper/uuid.h>
263b6c88 32#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 33#include <wrapper/random.h>
34#include <wrapper/tracepoint.h>
35#include <wrapper/list.h>
cbc19040 36#include <wrapper/types.h>
2df37e95
MD		 37#include <lttng/kernel-version.h>
38#include <lttng/events.h>
92bc1e23 39#include <lttng/events-internal.h>
0b365677 40#include <lttng/lttng-bytecode.h>
2df37e95 41#include <lttng/tracer.h>
21f58fb7 42#include <lttng/event-notifier-notification.h>
2df37e95
MD		 43#include <lttng/abi-old.h>
44#include <lttng/endian.h>
45#include <lttng/string-utils.h>
4a11ef1c 46#include <lttng/utils.h>
24591303
MD		 47#include <ringbuffer/backend.h>
48#include <ringbuffer/frontend.h>
3636085f 49#include <wrapper/time.h>
4e3c1b9b 50
d83004aa
JD		 51#define METADATA_CACHE_DEFAULT_SIZE 4096
52
4e3c1b9b 53static LIST_HEAD(sessions);
750b05f2 54static LIST_HEAD(event_notifier_groups);
a90917c3 55static LIST_HEAD(lttng_transport_list);
a101fa10 56static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 57/*
58 * Protect the sessions and metadata caches.
59 */
4e3c1b9b 60static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 61static struct kmem_cache *event_recorder_cache;
62static struct kmem_cache *event_recorder_private_cache;
dffef45d 63static struct kmem_cache *event_notifier_cache;
a67ba386 64static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 65
b2bc0bc8
FD		 66static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
67static void lttng_session_sync_event_enablers(struct lttng_session *session);
68static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
dffef45d 69static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
b01155ba 70static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
3c997079 71
0648898e 72static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
a90917c3 73static void _lttng_channel_destroy(struct lttng_channel *chan);
a67ba386
MD		 74static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event);
75static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier);
c099397a 76static
a90917c3
MD		 77int _lttng_event_metadata_statedump(struct lttng_session *session,
78 struct lttng_channel *chan,
a67ba386 79 struct lttng_kernel_event_recorder *event);
c099397a 80static
a90917c3 81int _lttng_session_metadata_statedump(struct lttng_session *session);
d83004aa
JD		 82static
83void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 84static
ceabb767 85int _lttng_type_statedump(struct lttng_session *session,
437d5aa5
MD		 86 const struct lttng_kernel_type_common *type,
87 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 88 size_t nesting);
89static
f513b2bf 90int _lttng_field_statedump(struct lttng_session *session,
437d5aa5 91 const struct lttng_kernel_event_field *field,
f513b2bf 92 size_t nesting);
c099397a 93
c099397a 94void synchronize_trace(void)
abcca994 95{
5f4c791e 96#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
92da05ce
MJ		 97 synchronize_rcu();
98#else
abcca994 99 synchronize_sched();
92da05ce
MJ		 100#endif
101
5f4c791e 102#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 103#ifdef CONFIG_PREEMPT_RT_FULL
104 synchronize_rcu();
105#endif
5f4c791e 106#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 107#ifdef CONFIG_PREEMPT_RT
108 synchronize_rcu();
109#endif
5f4c791e 110#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 111}
112
3c997079
MD		 113void lttng_lock_sessions(void)
114{
115 mutex_lock(&sessions_mutex);
116}
117
118void lttng_unlock_sessions(void)
119{
120 mutex_unlock(&sessions_mutex);
121}
122
9fe593d2
FD		 123static struct lttng_transport *lttng_transport_find(const char *name)
124{
125 struct lttng_transport *transport;
126
127 list_for_each_entry(transport, &lttng_transport_list, node) {
128 if (!strcmp(transport->name, name))
129 return transport;
130 }
131 return NULL;
132}
133
3c997079
MD		 134/*
135 * Called with sessions lock held.
136 */
137int lttng_session_active(void)
138{
139 struct lttng_session *iter;
140
141 list_for_each_entry(iter, &sessions, list) {
142 if (iter->active)
143 return 1;
144 }
145 return 0;
146}
147
a90917c3 148struct lttng_session *lttng_session_create(void)
4e3c1b9b 149{
a90917c3 150 struct lttng_session *session;
d83004aa 151 struct lttng_metadata_cache *metadata_cache;
3c997079 152 int i;
4e3c1b9b
MD		 153
154 mutex_lock(&sessions_mutex);
48f5e0b5 155 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
4e3c1b9b 156 if (!session)
d83004aa 157 goto err;
4e3c1b9b 158 INIT_LIST_HEAD(&session->chan);
f3d01b96 159 INIT_LIST_HEAD(&session->events);
a7008254 160 lttng_guid_gen(&session->uuid);
d83004aa
JD		 161
162 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
163 GFP_KERNEL);
164 if (!metadata_cache)
165 goto err_free_session;
0ca42eb7 166 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 167 if (!metadata_cache->data)
168 goto err_free_cache;
169 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
170 kref_init(&metadata_cache->refcount);
92d9f5e6 171 mutex_init(&metadata_cache->lock);
d83004aa
JD		 172 session->metadata_cache = metadata_cache;
173 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
a36580d5
MD		 174 memcpy(&metadata_cache->uuid, &session->uuid,
175 sizeof(metadata_cache->uuid));
3c997079
MD		 176 INIT_LIST_HEAD(&session->enablers_head);
177 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
178 INIT_HLIST_HEAD(&session->events_ht.table[i]);
4e3c1b9b 179 list_add(&session->list, &sessions);
d1f652f8
MD		 180 session->pid_tracker.session = session;
181 session->pid_tracker.tracker_type = TRACKER_PID;
182 session->vpid_tracker.session = session;
183 session->vpid_tracker.tracker_type = TRACKER_VPID;
184 session->uid_tracker.session = session;
185 session->uid_tracker.tracker_type = TRACKER_UID;
186 session->vuid_tracker.session = session;
187 session->vuid_tracker.tracker_type = TRACKER_VUID;
188 session->gid_tracker.session = session;
189 session->gid_tracker.tracker_type = TRACKER_GID;
190 session->vgid_tracker.session = session;
191 session->vgid_tracker.tracker_type = TRACKER_VGID;
4e3c1b9b
MD		 192 mutex_unlock(&sessions_mutex);
193 return session;
d83004aa
JD		 194
195err_free_cache:
196 kfree(metadata_cache);
197err_free_session:
48f5e0b5 198 lttng_kvfree(session);
d83004aa
JD		 199err:
200 mutex_unlock(&sessions_mutex);
201 return NULL;
202}
203
99f52fcc
FD		 204static
205struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
206{
207 struct lttng_counter_transport *transport;
208
209 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
210 if (!strcmp(transport->name, name))
211 return transport;
212 }
213 return NULL;
214}
215
216struct lttng_counter *lttng_kernel_counter_create(
217 const char *counter_transport_name,
218 size_t number_dimensions, const size_t *dimensions_sizes)
219{
220 struct lttng_counter *counter = NULL;
221 struct lttng_counter_transport *counter_transport = NULL;
222
223 counter_transport = lttng_counter_transport_find(counter_transport_name);
224 if (!counter_transport) {
225 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
226 counter_transport_name);
227 goto notransport;
228 }
229 if (!try_module_get(counter_transport->owner)) {
230 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
231 goto notransport;
232 }
233
234 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
235 if (!counter)
236 goto nomem;
237
238 /* Create event notifier error counter. */
239 counter->ops = &counter_transport->ops;
240 counter->transport = counter_transport;
241
242 counter->counter = counter->ops->counter_create(
243 number_dimensions, dimensions_sizes, 0);
244 if (!counter->counter) {
245 goto create_error;
246 }
247
248 return counter;
249
250create_error:
251 lttng_kvfree(counter);
252nomem:
253 if (counter_transport)
254 module_put(counter_transport->owner);
255notransport:
256 return NULL;
257}
258
750b05f2
FD		 259struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
260{
261 struct lttng_transport *transport = NULL;
262 struct lttng_event_notifier_group *event_notifier_group;
263 const char *transport_name = "relay-event-notifier";
264 size_t subbuf_size = 4096; //TODO
265 size_t num_subbuf = 16; //TODO
266 unsigned int switch_timer_interval = 0;
267 unsigned int read_timer_interval = 0;
dffef45d 268 int i;
750b05f2
FD		 269
270 mutex_lock(&sessions_mutex);
271
272 transport = lttng_transport_find(transport_name);
273 if (!transport) {
274 printk(KERN_WARNING "LTTng: transport %s not found\n",
275 transport_name);
276 goto notransport;
277 }
278 if (!try_module_get(transport->owner)) {
279 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
280 transport_name);
281 goto notransport;
282 }
283
284 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
285 GFP_KERNEL);
286 if (!event_notifier_group)
287 goto nomem;
288
289 /*
290 * Initialize the ring buffer used to store event notifier
291 * notifications.
292 */
293 event_notifier_group->ops = &transport->ops;
294 event_notifier_group->chan = transport->ops.channel_create(
295 transport_name, event_notifier_group, NULL,
296 subbuf_size, num_subbuf, switch_timer_interval,
297 read_timer_interval);
298 if (!event_notifier_group->chan)
299 goto create_error;
300
301 event_notifier_group->transport = transport;
dffef45d
FD		 302
303 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
304 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
305 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
306 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
307
750b05f2
FD		 308 list_add(&event_notifier_group->node, &event_notifier_groups);
309
310 mutex_unlock(&sessions_mutex);
311
312 return event_notifier_group;
313
314create_error:
315 lttng_kvfree(event_notifier_group);
316nomem:
317 if (transport)
318 module_put(transport->owner);
319notransport:
320 mutex_unlock(&sessions_mutex);
321 return NULL;
322}
323
d83004aa
JD		 324void metadata_cache_destroy(struct kref *kref)
325{
326 struct lttng_metadata_cache *cache =
327 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 328 vfree(cache->data);
d83004aa 329 kfree(cache);
4e3c1b9b
MD		 330}
331
a90917c3 332void lttng_session_destroy(struct lttng_session *session)
4e3c1b9b 333{
a90917c3 334 struct lttng_channel *chan, *tmpchan;
a67ba386 335 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 336 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 337 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 338 int ret;
4e3c1b9b
MD		 339
340 mutex_lock(&sessions_mutex);
a8f2d0c7 341 WRITE_ONCE(session->active, 0);
1ec65de1 342 list_for_each_entry(chan, &session->chan, list) {
3b82c4e1 343 ret = lttng_syscalls_unregister_channel(chan);
1ec65de1
MD		 344 WARN_ON(ret);
345 }
a67ba386
MD		 346 list_for_each_entry(event_recorder_priv, &session->events, node) {
347 ret = _lttng_event_unregister(event_recorder_priv->pub);
dda6a249
MD		 348 WARN_ON(ret);
349 }
abcca994 350 synchronize_trace(); /* Wait for in-flight events to complete */
badfe9f5 351 list_for_each_entry(chan, &session->chan, list) {
2d6d88c6 352 ret = lttng_syscalls_destroy_event(chan);
badfe9f5
MD		 353 WARN_ON(ret);
354 }
b2bc0bc8 355 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
3c997079 356 &session->enablers_head, node)
b2bc0bc8 357 lttng_event_enabler_destroy(event_enabler);
a67ba386 358 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->events, node)
0648898e 359 _lttng_event_destroy(&event_recorder_priv->pub->parent);
d83004aa
JD		 360 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
361 BUG_ON(chan->channel_type == METADATA_CHANNEL);
a90917c3 362 _lttng_channel_destroy(chan);
d83004aa 363 }
ab036a63 364 mutex_lock(&session->metadata_cache->lock);
d83004aa
JD		 365 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
366 _lttng_metadata_channel_hangup(metadata_stream);
ab036a63 367 mutex_unlock(&session->metadata_cache->lock);
d1f652f8
MD		 368 lttng_id_tracker_destroy(&session->pid_tracker, false);
369 lttng_id_tracker_destroy(&session->vpid_tracker, false);
370 lttng_id_tracker_destroy(&session->uid_tracker, false);
371 lttng_id_tracker_destroy(&session->vuid_tracker, false);
372 lttng_id_tracker_destroy(&session->gid_tracker, false);
373 lttng_id_tracker_destroy(&session->vgid_tracker, false);
d83004aa 374 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
4e3c1b9b
MD		 375 list_del(&session->list);
376 mutex_unlock(&sessions_mutex);
48f5e0b5 377 lttng_kvfree(session);
4e3c1b9b
MD		 378}
379
dffef45d
FD		 380void lttng_event_notifier_group_destroy(
381 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 382{
dffef45d 383 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
a67ba386 384 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 385 int ret;
386
750b05f2
FD		 387 if (!event_notifier_group)
388 return;
389
390 mutex_lock(&sessions_mutex);
dffef45d 391
3b82c4e1 392 ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group);
8a8ac9a8
FD		 393 WARN_ON(ret);
394
a67ba386
MD		 395 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
396 &event_notifier_group->event_notifiers_head, node) {
397 ret = _lttng_event_notifier_unregister(event_notifier_priv->pub);
dffef45d
FD		 398 WARN_ON(ret);
399 }
400
b01155ba
FD		 401 /* Wait for in-flight event notifier to complete */
402 synchronize_trace();
403
21f58fb7
FD		 404 irq_work_sync(&event_notifier_group->wakeup_pending);
405
8a8ac9a8
FD		 406 kfree(event_notifier_group->sc_filter);
407
dffef45d
FD		 408 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
409 &event_notifier_group->enablers_head, node)
410 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
411
a67ba386
MD		 412 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
413 &event_notifier_group->event_notifiers_head, node)
0648898e 414 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 415
99f52fcc
FD		 416 if (event_notifier_group->error_counter) {
417 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 418
99f52fcc
FD		 419 error_counter->ops->counter_destroy(error_counter->counter);
420 module_put(error_counter->transport->owner);
421 lttng_kvfree(error_counter);
422 event_notifier_group->error_counter = NULL;
423 }
424
750b05f2
FD		 425 event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
426 module_put(event_notifier_group->transport->owner);
427 list_del(&event_notifier_group->node);
dffef45d 428
750b05f2
FD		 429 mutex_unlock(&sessions_mutex);
430 lttng_kvfree(event_notifier_group);
431}
432
601252cf
MD		 433int lttng_session_statedump(struct lttng_session *session)
434{
435 int ret;
436
437 mutex_lock(&sessions_mutex);
438 ret = lttng_statedump_start(session);
439 mutex_unlock(&sessions_mutex);
440 return ret;
441}
442
a90917c3 443int lttng_session_enable(struct lttng_session *session)
c0e31d2e
MD		 444{
445 int ret = 0;
a90917c3 446 struct lttng_channel *chan;
c0e31d2e
MD		 447
448 mutex_lock(&sessions_mutex);
449 if (session->active) {
450 ret = -EBUSY;
451 goto end;
452 }
c099397a 453
3c997079
MD		 454 /* Set transient enabler state to "enabled" */
455 session->tstate = 1;
456
4ef81e4a 457 /* We need to sync enablers with session before activation. */
b2bc0bc8 458 lttng_session_sync_event_enablers(session);
4ef81e4a 459
c099397a
MD		 460 /*
461 * Snapshot the number of events per channel to know the type of header
462 * we need to use.
463 */
464 list_for_each_entry(chan, &session->chan, list) {
465 if (chan->header_type)
466 continue; /* don't change it if session stop/restart */
467 if (chan->free_event_id < 31)
468 chan->header_type = 1; /* compact */
469 else
470 chan->header_type = 2; /* large */
471 }
472
64af2437 473 /* Clear each stream's quiescent state. */
09b93db9
MD		 474 list_for_each_entry(chan, &session->chan, list) {
475 if (chan->channel_type != METADATA_CHANNEL)
476 lib_ring_buffer_clear_quiescent_channel(chan->chan);
477 }
64af2437 478
a8f2d0c7
MJ		 479 WRITE_ONCE(session->active, 1);
480 WRITE_ONCE(session->been_active, 1);
a90917c3 481 ret = _lttng_session_metadata_statedump(session);
c337ddc2 482 if (ret) {
a8f2d0c7 483 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 484 goto end;
485 }
486 ret = lttng_statedump_start(session);
360f38ea 487 if (ret)
a8f2d0c7 488 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 489end:
490 mutex_unlock(&sessions_mutex);
11b5a3c2 491 return ret;
c0e31d2e
MD		 492}
493
a90917c3 494int lttng_session_disable(struct lttng_session *session)
c0e31d2e
MD		 495{
496 int ret = 0;
64af2437 497 struct lttng_channel *chan;
c0e31d2e
MD		 498
499 mutex_lock(&sessions_mutex);
500 if (!session->active) {
501 ret = -EBUSY;
502 goto end;
503 }
a8f2d0c7 504 WRITE_ONCE(session->active, 0);
3c997079
MD		 505
506 /* Set transient enabler state to "disabled" */
507 session->tstate = 0;
b2bc0bc8 508 lttng_session_sync_event_enablers(session);
64af2437
MD		 509
510 /* Set each stream's quiescent state. */
09b93db9
MD		 511 list_for_each_entry(chan, &session->chan, list) {
512 if (chan->channel_type != METADATA_CHANNEL)
513 lib_ring_buffer_set_quiescent_channel(chan->chan);
514 }
c0e31d2e
MD		 515end:
516 mutex_unlock(&sessions_mutex);
11b5a3c2 517 return ret;
c0e31d2e
MD		 518}
519
9616f0bf
JD		 520int lttng_session_metadata_regenerate(struct lttng_session *session)
521{
522 int ret = 0;
523 struct lttng_channel *chan;
a67ba386 524 struct lttng_kernel_event_recorder_private *event_recorder_priv;
9616f0bf
JD		 525 struct lttng_metadata_cache *cache = session->metadata_cache;
526 struct lttng_metadata_stream *stream;
527
528 mutex_lock(&sessions_mutex);
529 if (!session->active) {
530 ret = -EBUSY;
531 goto end;
532 }
533
534 mutex_lock(&cache->lock);
535 memset(cache->data, 0, cache->cache_alloc);
536 cache->metadata_written = 0;
537 cache->version++;
538 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
539 stream->metadata_out = 0;
540 stream->metadata_in = 0;
541 }
542 mutex_unlock(&cache->lock);
543
544 session->metadata_dumped = 0;
545 list_for_each_entry(chan, &session->chan, list) {
546 chan->metadata_dumped = 0;
547 }
548
a67ba386
MD		 549 list_for_each_entry(event_recorder_priv, &session->events, node) {
550 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 551 }
552
553 ret = _lttng_session_metadata_statedump(session);
554
555end:
556 mutex_unlock(&sessions_mutex);
557 return ret;
558}
559
a90917c3 560int lttng_channel_enable(struct lttng_channel *channel)
e64957da 561{
3c997079 562 int ret = 0;
e64957da 563
3c997079
MD		 564 mutex_lock(&sessions_mutex);
565 if (channel->channel_type == METADATA_CHANNEL) {
566 ret = -EPERM;
567 goto end;
568 }
569 if (channel->enabled) {
570 ret = -EEXIST;
571 goto end;
572 }
573 /* Set transient enabler state to "enabled" */
574 channel->tstate = 1;
b2bc0bc8 575 lttng_session_sync_event_enablers(channel->session);
3c997079 576 /* Set atomically the state to "enabled" */
a8f2d0c7 577 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 578end:
579 mutex_unlock(&sessions_mutex);
580 return ret;
e64957da
MD		 581}
582
a90917c3 583int lttng_channel_disable(struct lttng_channel *channel)
e64957da 584{
3c997079 585 int ret = 0;
e64957da 586
3c997079
MD		 587 mutex_lock(&sessions_mutex);
588 if (channel->channel_type == METADATA_CHANNEL) {
589 ret = -EPERM;
590 goto end;
591 }
592 if (!channel->enabled) {
593 ret = -EEXIST;
594 goto end;
595 }
596 /* Set atomically the state to "disabled" */
a8f2d0c7 597 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 598 /* Set transient enabler state to "enabled" */
599 channel->tstate = 0;
b2bc0bc8 600 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 601end:
602 mutex_unlock(&sessions_mutex);
603 return ret;
e64957da
MD		 604}
605
a67ba386 606int lttng_event_enable(struct lttng_kernel_event_recorder *event_recorder)
e64957da 607{
a67ba386 608 struct lttng_kernel_event_common *event = &event_recorder->parent;
3c997079 609 int ret = 0;
e64957da 610
3c997079 611 mutex_lock(&sessions_mutex);
a67ba386 612 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
3c997079
MD		 613 ret = -EPERM;
614 goto end;
615 }
616 if (event->enabled) {
617 ret = -EEXIST;
618 goto end;
619 }
a67ba386 620 switch (event->priv->instrumentation) {
606828e4
MD		 621 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
622 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 623 ret = -EINVAL;
624 break;
b4a75708 625
606828e4
MD		 626 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
627 case LTTNG_KERNEL_ABI_UPROBE:
a8f2d0c7 628 WRITE_ONCE(event->enabled, 1);
a0493bef 629 break;
b4a75708 630
606828e4 631 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 632 ret = lttng_kretprobes_event_enable_state(event_recorder, 1);
a0493bef 633 break;
b4a75708 634
606828e4
MD		 635 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
636 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 637 default:
638 WARN_ON_ONCE(1);
639 ret = -EINVAL;
640 }
3c997079
MD		 641end:
642 mutex_unlock(&sessions_mutex);
643 return ret;
e64957da
MD		 644}
645
a67ba386 646int lttng_event_disable(struct lttng_kernel_event_recorder *event_recorder)
e64957da 647{
a67ba386 648 struct lttng_kernel_event_common *event = &event_recorder->parent;
3c997079 649 int ret = 0;
e64957da 650
3c997079 651 mutex_lock(&sessions_mutex);
a67ba386 652 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
3c997079
MD		 653 ret = -EPERM;
654 goto end;
655 }
656 if (!event->enabled) {
657 ret = -EEXIST;
658 goto end;
659 }
a67ba386 660 switch (event->priv->instrumentation) {
606828e4
MD		 661 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
662 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 663 ret = -EINVAL;
664 break;
b4a75708 665
606828e4
MD		 666 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
667 case LTTNG_KERNEL_ABI_UPROBE:
a8f2d0c7 668 WRITE_ONCE(event->enabled, 0);
a0493bef 669 break;
b4a75708 670
606828e4 671 case LTTNG_KERNEL_ABI_KRETPROBE:
b4a75708 672
a67ba386 673 ret = lttng_kretprobes_event_enable_state(event_recorder, 0);
a0493bef 674 break;
b4a75708 675
606828e4
MD		 676 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
677 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 678 default:
679 WARN_ON_ONCE(1);
680 ret = -EINVAL;
681 }
3c997079
MD		 682end:
683 mutex_unlock(&sessions_mutex);
684 return ret;
e64957da
MD		 685}
686
a67ba386 687int lttng_event_notifier_enable(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 688{
a67ba386 689 struct lttng_kernel_event_common *event = &event_notifier->parent;
dffef45d
FD		 690 int ret = 0;
691
692 mutex_lock(&sessions_mutex);
a67ba386 693 if (event->enabled) {
dffef45d
FD		 694 ret = -EEXIST;
695 goto end;
696 }
a67ba386 697 switch (event->priv->instrumentation) {
606828e4
MD		 698 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
699 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 700 ret = -EINVAL;
701 break;
b4a75708 702
606828e4
MD		 703 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
704 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 705 WRITE_ONCE(event->enabled, 1);
2b16f0c9 706 break;
b4a75708 707
606828e4
MD		 708 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
709 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
710 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 711 default:
712 WARN_ON_ONCE(1);
713 ret = -EINVAL;
714 }
715end:
716 mutex_unlock(&sessions_mutex);
717 return ret;
718}
719
a67ba386 720int lttng_event_notifier_disable(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 721{
a67ba386 722 struct lttng_kernel_event_common *event = &event_notifier->parent;
dffef45d
FD		 723 int ret = 0;
724
725 mutex_lock(&sessions_mutex);
a67ba386 726 if (!event->enabled) {
dffef45d
FD		 727 ret = -EEXIST;
728 goto end;
729 }
a67ba386 730 switch (event->priv->instrumentation) {
606828e4
MD		 731 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
732 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 733 ret = -EINVAL;
734 break;
b4a75708 735
606828e4
MD		 736 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
737 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 738 WRITE_ONCE(event->enabled, 0);
2b16f0c9 739 break;
b4a75708 740
606828e4
MD		 741 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
742 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
743 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 744 default:
745 WARN_ON_ONCE(1);
746 ret = -EINVAL;
747 }
748end:
749 mutex_unlock(&sessions_mutex);
750 return ret;
751}
752
a90917c3 753struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 754 const char *transport_name,
755 void *buf_addr,
4e3c1b9b
MD		 756 size_t subbuf_size, size_t num_subbuf,
757 unsigned int switch_timer_interval,
d83004aa
JD		 758 unsigned int read_timer_interval,
759 enum channel_type channel_type)
4e3c1b9b 760{
a90917c3
MD		 761 struct lttng_channel *chan;
762 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 763
764 mutex_lock(&sessions_mutex);
d83004aa 765 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 766 goto active; /* Refuse to add channel to active session */
a90917c3 767 transport = lttng_transport_find(transport_name);
f3d01b96 768 if (!transport) {
5a15f70c 769 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 770 transport_name);
c0e31d2e 771 goto notransport;
f3d01b96 772 }
a33c9927 773 if (!try_module_get(transport->owner)) {
5a15f70c 774 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 775 goto notransport;
776 }
a90917c3 777 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 778 if (!chan)
c0e31d2e 779 goto nomem;
4e3c1b9b 780 chan->session = session;
05d32c64 781 chan->id = session->free_chan_id++;
3b731ab1 782 chan->ops = &transport->ops;
125b4df4
MD		 783 /*
784 * Note: the channel creation op already writes into the packet
785 * headers. Therefore the "chan" information used as input
786 * should be already accessible.
787 */
5f5ddf01
MD		 788 chan->chan = transport->ops.channel_create(transport_name,
789 chan, buf_addr, subbuf_size, num_subbuf,
790 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 791 if (!chan->chan)
792 goto create_error;
3c997079 793 chan->tstate = 1;
e64957da 794 chan->enabled = 1;
a33c9927 795 chan->transport = transport;
d83004aa 796 chan->channel_type = channel_type;
4e3c1b9b
MD		 797 list_add(&chan->list, &session->chan);
798 mutex_unlock(&sessions_mutex);
799 return chan;
800
f3d01b96
MD		 801create_error:
802 kfree(chan);
c0e31d2e 803nomem:
a33c9927
MD		 804 if (transport)
805 module_put(transport->owner);
c0e31d2e 806notransport:
e5382b6d 807active:
4e3c1b9b
MD		 808 mutex_unlock(&sessions_mutex);
809 return NULL;
810}
811
812/*
d83004aa
JD		 813 * Only used internally at session destruction for per-cpu channels, and
814 * when metadata channel is released.
815 * Needs to be called with sessions mutex held.
4e3c1b9b 816 */
aa7c23a9 817static
a90917c3 818void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 819{
11b5a3c2 820 chan->ops->channel_destroy(chan->chan);
a33c9927 821 module_put(chan->transport->owner);
4e3c1b9b 822 list_del(&chan->list);
437d5aa5 823 lttng_kernel_destroy_context(chan->ctx);
4e3c1b9b
MD		 824 kfree(chan);
825}
826
d83004aa
JD		 827void lttng_metadata_channel_destroy(struct lttng_channel *chan)
828{
829 BUG_ON(chan->channel_type != METADATA_CHANNEL);
830
831 /* Protect the metadata cache with the sessions_mutex. */
832 mutex_lock(&sessions_mutex);
833 _lttng_channel_destroy(chan);
834 mutex_unlock(&sessions_mutex);
835}
836EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
837
838static
839void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
840{
841 stream->finalized = 1;
842 wake_up_interruptible(&stream->read_wait);
843}
844
a101fa10 845
e5382b6d
MD		 846/*
847 * Supports event creation while tracing session is active.
3c997079 848 * Needs to be called with sessions mutex held.
e5382b6d 849 */
a67ba386 850struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 851 struct lttng_kernel_abi_event *event_param,
437d5aa5 852 const struct lttng_kernel_event_desc *event_desc,
606828e4 853 enum lttng_kernel_abi_instrumentation itype)
4e3c1b9b 854{
3c997079 855 struct lttng_session *session = chan->session;
a67ba386
MD		 856 struct lttng_kernel_event_recorder *event_recorder;
857 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 858 const char *event_name;
859 struct hlist_head *head;
3d084699 860 int ret;
4e3c1b9b 861
abc0446a 862 if (chan->free_event_id == -1U) {
4cf0bf51 863 ret = -EMFILE;
e5382b6d 864 goto full;
abc0446a 865 }
3c997079
MD		 866
867 switch (itype) {
606828e4 868 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 869 event_name = event_desc->event_name;
3c997079 870 break;
b4a75708 871
606828e4
MD		 872 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
873 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
874 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
875 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 876 event_name = event_param->name;
877 break;
b4a75708 878
606828e4
MD		 879 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
880 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
3c997079
MD		 881 default:
882 WARN_ON_ONCE(1);
883 ret = -EINVAL;
884 goto type_error;
885 }
4a11ef1c
FD		 886
887 head = utils_borrow_hash_table_bucket(session->events_ht.table,
888 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 889 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
890 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
891 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 892 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 893 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 894 ret = -EEXIST;
895 goto exist;
abc0446a
MD		 896 }
897 }
3c997079 898
a67ba386
MD		 899 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
900 if (!event_recorder) {
4cf0bf51 901 ret = -ENOMEM;
4e3c1b9b 902 goto cache_error;
abc0446a 903 }
a67ba386
MD		 904 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
905 if (!event_recorder_priv) {
906 ret = -ENOMEM;
907 goto cache_private_error;
908 }
909 event_recorder_priv->pub = event_recorder;
910 event_recorder_priv->parent.pub = &event_recorder->parent;
911 event_recorder->priv = event_recorder_priv;
912 event_recorder->parent.priv = &event_recorder_priv->parent;
913 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
914
915 event_recorder->chan = chan;
916 event_recorder->priv->id = chan->free_event_id++;
917 event_recorder->priv->parent.instrumentation = itype;
918 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
919 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 920
921 switch (itype) {
606828e4 922 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 923 /* Event will be enabled by enabler sync. */
a67ba386
MD		 924 event_recorder->parent.enabled = 0;
925 event_recorder->priv->parent.registered = 0;
926 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
927 if (!event_recorder->priv->parent.desc) {
4cf0bf51 928 ret = -ENOENT;
d3dbe23c 929 goto register_error;
abc0446a 930 }
3c997079
MD		 931 /* Populate lttng_event structure before event registration. */
932 smp_wmb();
baf20995 933 break;
b4a75708 934
606828e4 935 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 936 /*
937 * Needs to be explicitly enabled after creation, since
938 * we may want to apply filters.
939 */
a67ba386
MD		 940 event_recorder->parent.enabled = 0;
941 event_recorder->priv->parent.registered = 1;
3c997079
MD		 942 /*
943 * Populate lttng_event structure before event
944 * registration.
945 */
946 smp_wmb();
8bf17deb 947 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 948 event_param->u.kprobe.symbol_name,
949 event_param->u.kprobe.offset,
950 event_param->u.kprobe.addr,
a67ba386 951 event_recorder);
abc0446a 952 if (ret) {
4cf0bf51 953 ret = -EINVAL;
d6d808f3 954 goto register_error;
abc0446a 955 }
a67ba386 956 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 957 WARN_ON_ONCE(!ret);
d6d808f3 958 break;
b4a75708 959
606828e4 960 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 961 {
a67ba386
MD		 962 struct lttng_kernel_event_recorder *event_recorder_return;
963 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 964
965 /* kretprobe defines 2 events */
a0493bef
MD		 966 /*
967 * Needs to be explicitly enabled after creation, since
968 * we may want to apply filters.
969 */
a67ba386
MD		 970 event_recorder->parent.enabled = 0;
971 event_recorder->priv->parent.registered = 1;
972
973 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
974 if (!event_recorder_return) {
975 ret = -ENOMEM;
976 goto register_error;
977 }
978 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
979 if (!event_recorder_return_priv) {
980 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 981 ret = -ENOMEM;
7371f44c 982 goto register_error;
abc0446a 983 }
a67ba386
MD		 984 event_recorder_return_priv->pub = event_recorder_return;
985 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
986 event_recorder_return->priv = event_recorder_return_priv;
987 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
988 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
989
990 event_recorder_return->chan = chan;
991 event_recorder_return->priv->id = chan->free_event_id++;
992 event_recorder_return->priv->parent.instrumentation = itype;
993 event_recorder_return->parent.enabled = 0;
994 event_recorder_return->priv->parent.registered = 1;
995 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
996 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 997 /*
a90917c3 998 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 999 */
1000 smp_wmb();
3c997079 1001 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1002 event_param->u.kretprobe.symbol_name,
1003 event_param->u.kretprobe.offset,
1004 event_param->u.kretprobe.addr,
a67ba386 1005 event_recorder, event_recorder_return);
7371f44c 1006 if (ret) {
a67ba386
MD		 1007 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1008 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1009 ret = -EINVAL;
7371f44c
MD		 1010 goto register_error;
1011 }
1012 /* Take 2 refs on the module: one per event. */
a67ba386 1013 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1014 WARN_ON_ONCE(!ret);
a67ba386 1015 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1016 WARN_ON_ONCE(!ret);
a90917c3 1017 ret = _lttng_event_metadata_statedump(chan->session, chan,
a67ba386 1018 event_recorder_return);
abc0446a 1019 WARN_ON_ONCE(ret > 0);
7371f44c 1020 if (ret) {
a67ba386
MD		 1021 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1022 kmem_cache_free(event_recorder_cache, event_recorder_return);
1023 module_put(event_recorder_return->priv->parent.desc->owner);
1024 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1025 goto statedump_error;
1026 }
a67ba386 1027 list_add(&event_recorder_return->priv->node, &chan->session->events);
7371f44c
MD		 1028 break;
1029 }
b4a75708 1030
606828e4 1031 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1032 /*
1033 * Needs to be explicitly enabled after creation, since
1034 * we may want to apply filters.
1035 */
a67ba386
MD		 1036 event_recorder->parent.enabled = 0;
1037 event_recorder->priv->parent.registered = 0;
1038 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1039 switch (event_param->u.syscall.entryexit) {
606828e4 1040 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1041 ret = -EINVAL;
1042 goto register_error;
606828e4 1043 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1044 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1045 break;
606828e4 1046 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1047 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1048 break;
1049 }
1050 switch (event_param->u.syscall.abi) {
606828e4 1051 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1052 ret = -EINVAL;
1053 goto register_error;
606828e4 1054 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1055 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1056 break;
606828e4 1057 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1058 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1059 break;
1060 }
a67ba386 1061 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1062 ret = -EINVAL;
259b6cb3 1063 goto register_error;
abc0446a 1064 }
1ec65de1 1065 break;
b4a75708 1066
606828e4 1067 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1068 /*
1069 * Needs to be explicitly enabled after creation, since
1070 * we may want to apply filters.
1071 */
a67ba386
MD		 1072 event_recorder->parent.enabled = 0;
1073 event_recorder->priv->parent.registered = 1;
3aed4dca 1074
a344f64b
FD		 1075 /*
1076 * Populate lttng_event structure before event
1077 * registration.
1078 */
1079 smp_wmb();
149b9a9d 1080
83b802dc 1081 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1082 event_param->u.uprobe.fd,
a67ba386 1083 event_recorder);
149b9a9d
YB		 1084 if (ret)
1085 goto register_error;
a67ba386 1086 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1087 WARN_ON_ONCE(!ret);
1088 break;
b4a75708 1089
606828e4
MD		 1090 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1091 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
baf20995
MD		 1092 default:
1093 WARN_ON_ONCE(1);
4cf0bf51 1094 ret = -EINVAL;
df07930b 1095 goto register_error;
baf20995 1096 }
a67ba386 1097 ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder);
abc0446a
MD		 1098 WARN_ON_ONCE(ret > 0);
1099 if (ret) {
c099397a 1100 goto statedump_error;
abc0446a 1101 }
a67ba386
MD		 1102 hlist_add_head(&event_recorder->priv->hlist, head);
1103 list_add(&event_recorder->priv->node, &chan->session->events);
1104 return event_recorder;
4e3c1b9b 1105
c099397a 1106statedump_error:
259b6cb3 1107 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1108register_error:
a67ba386
MD		 1109 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1110cache_private_error:
1111 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1112cache_error:
1113exist:
3c997079 1114type_error:
e5382b6d 1115full:
4cf0bf51 1116 return ERR_PTR(ret);
4e3c1b9b
MD		 1117}
1118
a67ba386 1119struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1120 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1121 uint64_t token, uint64_t error_counter_index,
1122 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1123 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1124 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1125{
a67ba386
MD		 1126 struct lttng_kernel_event_notifier *event_notifier;
1127 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1128 struct lttng_counter *error_counter;
dffef45d
FD		 1129 const char *event_name;
1130 struct hlist_head *head;
1131 int ret;
1132
1133 switch (itype) {
606828e4 1134 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1135 event_name = event_desc->event_name;
b01155ba 1136 break;
b4a75708 1137
606828e4
MD		 1138 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1139 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1140 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1141 event_name = event_notifier_param->event.name;
1142 break;
b4a75708 1143
606828e4
MD		 1144 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1145 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1146 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1147 default:
1148 WARN_ON_ONCE(1);
1149 ret = -EINVAL;
1150 goto type_error;
1151 }
1152
1153 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1154 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1155 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1156 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1157 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1158 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1159 && event_notifier_group == event_notifier_priv->group
1160 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1161 ret = -EEXIST;
1162 goto exist;
1163 }
1164 }
1165
1166 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1167 if (!event_notifier) {
1168 ret = -ENOMEM;
1169 goto cache_error;
1170 }
a67ba386
MD		 1171 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1172 if (!event_notifier_priv) {
1173 ret = -ENOMEM;
1174 goto cache_private_error;
1175 }
1176 event_notifier_priv->pub = event_notifier;
1177 event_notifier_priv->parent.pub = &event_notifier->parent;
1178 event_notifier->priv = event_notifier_priv;
1179 event_notifier->parent.priv = &event_notifier_priv->parent;
1180 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1181
1182 event_notifier->priv->group = event_notifier_group;
1183 event_notifier->priv->parent.user_token = token;
1184 event_notifier->priv->error_counter_index = error_counter_index;
1185 event_notifier->priv->num_captures = 0;
1186 event_notifier->priv->parent.instrumentation = itype;
1187 event_notifier->notification_send = lttng_event_notifier_notification_send;
1188 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1189 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1190 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
dffef45d
FD		 1191
1192 switch (itype) {
606828e4 1193 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1194 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1195 event_notifier->parent.enabled = 0;
1196 event_notifier->priv->parent.registered = 0;
1197 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1198 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1199 ret = -ENOENT;
1200 goto register_error;
1201 }
1202 /* Populate lttng_event_notifier structure before event registration. */
1203 smp_wmb();
1204 break;
b4a75708 1205
606828e4 1206 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1207 /*
1208 * Needs to be explicitly enabled after creation, since
1209 * we may want to apply filters.
1210 */
a67ba386
MD		 1211 event_notifier->parent.enabled = 0;
1212 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1213 /*
1214 * Populate lttng_event_notifier structure before event
1215 * registration.
1216 */
1217 smp_wmb();
1218 ret = lttng_kprobes_register_event_notifier(
1219 event_notifier_param->event.u.kprobe.symbol_name,
1220 event_notifier_param->event.u.kprobe.offset,
1221 event_notifier_param->event.u.kprobe.addr,
1222 event_notifier);
1223 if (ret) {
1224 ret = -EINVAL;
1225 goto register_error;
1226 }
a67ba386 1227 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1228 WARN_ON_ONCE(!ret);
1229 break;
b4a75708 1230
606828e4 1231 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1232 /*
1233 * Needs to be explicitly enabled after creation, since
1234 * we may want to apply filters.
1235 */
a67ba386
MD		 1236 event_notifier->parent.enabled = 0;
1237 event_notifier->priv->parent.registered = 0;
1238 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1239 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1240 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1241 ret = -EINVAL;
1242 goto register_error;
606828e4 1243 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1244 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1245 break;
606828e4 1246 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1247 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1248 break;
1249 }
1250 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1251 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1252 ret = -EINVAL;
1253 goto register_error;
606828e4 1254 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1255 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1256 break;
606828e4 1257 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1258 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1259 break;
1260 }
1261
a67ba386 1262 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1263 ret = -EINVAL;
1264 goto register_error;
1265 }
1266 break;
b4a75708 1267
606828e4 1268 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1269 /*
1270 * Needs to be explicitly enabled after creation, since
1271 * we may want to apply filters.
1272 */
a67ba386
MD		 1273 event_notifier->parent.enabled = 0;
1274 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1275
1276 /*
1277 * Populate lttng_event_notifier structure before
1278 * event_notifier registration.
1279 */
1280 smp_wmb();
1281
1282 ret = lttng_uprobes_register_event_notifier(
1283 event_notifier_param->event.name,
1284 event_notifier_param->event.u.uprobe.fd,
1285 event_notifier);
1286 if (ret)
1287 goto register_error;
a67ba386 1288 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1289 WARN_ON_ONCE(!ret);
1290 break;
b4a75708 1291
606828e4
MD		 1292 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1293 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1294 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1295 default:
1296 WARN_ON_ONCE(1);
1297 ret = -EINVAL;
1298 goto register_error;
1299 }
1300
a67ba386
MD		 1301 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1302 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1303
1304 /*
1305 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1306 * bucket is currently in use. We trust it. The session lock
1307 * synchronizes against concurrent creation of the error
1308 * counter.
99f52fcc 1309 */
ab04d7b1
MD		 1310 error_counter = event_notifier_group->error_counter;
1311 if (error_counter) {
99f52fcc
FD		 1312 size_t dimension_index[1];
1313
1314 /*
1315 * Check that the index is within the boundary of the counter.
1316 */
a67ba386 1317 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1318 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1319 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1320 ret = -EINVAL;
1321 goto register_error;
1322 }
1323
a67ba386 1324 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1325 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1326 if (ret) {
1327 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1328 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1329 goto register_error;
1330 }
1331 }
1332
dffef45d
FD		 1333 return event_notifier;
1334
1335register_error:
a67ba386
MD		 1336 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1337cache_private_error:
dffef45d
FD		 1338 kmem_cache_free(event_notifier_cache, event_notifier);
1339cache_error:
1340exist:
1341type_error:
1342 return ERR_PTR(ret);
1343}
1344
99f52fcc
FD		 1345int lttng_kernel_counter_read(struct lttng_counter *counter,
1346 const size_t *dim_indexes, int32_t cpu,
1347 int64_t *val, bool *overflow, bool *underflow)
1348{
1349 return counter->ops->counter_read(counter->counter, dim_indexes,
1350 cpu, val, overflow, underflow);
1351}
1352
1353int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1354 const size_t *dim_indexes, int64_t *val,
1355 bool *overflow, bool *underflow)
1356{
1357 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1358 val, overflow, underflow);
1359}
1360
1361int lttng_kernel_counter_clear(struct lttng_counter *counter,
1362 const size_t *dim_indexes)
1363{
1364 return counter->ops->counter_clear(counter->counter, dim_indexes);
1365}
1366
a67ba386 1367struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 1368 struct lttng_kernel_abi_event *event_param,
437d5aa5 1369 const struct lttng_kernel_event_desc *event_desc,
606828e4 1370 enum lttng_kernel_abi_instrumentation itype)
3c997079 1371{
a67ba386 1372 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1373
1374 mutex_lock(&sessions_mutex);
a67ba386 1375 event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype);
3c997079
MD		 1376 mutex_unlock(&sessions_mutex);
1377 return event;
1378}
1379
a67ba386 1380struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1381 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1382 uint64_t id, uint64_t error_counter_index,
1383 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1384 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1385 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1386{
a67ba386 1387 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1388
1389 mutex_lock(&sessions_mutex);
1390 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1391 error_counter_index, event_notifier_group,
a67ba386 1392 event_notifier_param, itype);
dffef45d
FD		 1393 mutex_unlock(&sessions_mutex);
1394 return event_notifier;
1395}
1396
3c997079
MD		 1397/* Only used for tracepoints for now. */
1398static
a67ba386 1399void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1400{
437d5aa5 1401 const struct lttng_kernel_event_desc *desc;
f127e61e 1402 int ret = -EINVAL;
3c997079 1403
a67ba386 1404 if (event_recorder->priv->parent.registered)
3c997079 1405 return;
4ecb5ad5 1406
a67ba386
MD		 1407 desc = event_recorder->priv->parent.desc;
1408 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1409 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1410 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
4ecb5ad5 1411 desc->probe_callback,
a67ba386 1412 event_recorder);
4ecb5ad5 1413 break;
b4a75708 1414
606828e4 1415 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1416 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1417 break;
b4a75708 1418
606828e4
MD		 1419 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1420 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1421 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1422 ret = 0;
1423 break;
b4a75708 1424
606828e4
MD		 1425 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1426 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
4ecb5ad5
MD		 1427 default:
1428 WARN_ON_ONCE(1);
1429 }
3c997079 1430 if (!ret)
a67ba386 1431 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1432}
1433
4e3c1b9b
MD		 1434/*
1435 * Only used internally at session destruction.
1436 */
a67ba386 1437int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1438{
a67ba386 1439 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1440 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1441 int ret = -EINVAL;
1442
a67ba386 1443 if (!event_priv->registered)
3c997079
MD		 1444 return 0;
1445
a67ba386
MD		 1446 desc = event_priv->desc;
1447 switch (event_priv->instrumentation) {
606828e4 1448 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386
MD		 1449 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
1450 event_priv->desc->probe_callback,
1451 event_recorder);
baf20995 1452 break;
b4a75708 1453
606828e4 1454 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1455 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1456 ret = 0;
1457 break;
b4a75708 1458
606828e4 1459 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1460 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1461 ret = 0;
1462 break;
b4a75708 1463
606828e4 1464 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1465 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1466 break;
b4a75708 1467
606828e4 1468 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1469 ret = 0;
1470 break;
b4a75708 1471
606828e4 1472 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1473 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1474 ret = 0;
1475 break;
b4a75708 1476
606828e4 1477 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
baf20995
MD		 1478 default:
1479 WARN_ON_ONCE(1);
1480 }
3c997079 1481 if (!ret)
a67ba386 1482 event_priv->registered = 0;
dda6a249
MD		 1483 return ret;
1484}
1485
dffef45d
FD		 1486/* Only used for tracepoints for now. */
1487static
a67ba386 1488void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1489{
437d5aa5 1490 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1491 int ret = -EINVAL;
1492
a67ba386 1493 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1494 return;
1495
a67ba386
MD		 1496 desc = event_notifier->priv->parent.desc;
1497 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1498 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1499 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
b01155ba
FD		 1500 desc->event_notifier_callback,
1501 event_notifier);
1502 break;
b4a75708 1503
606828e4 1504 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1505 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1506 break;
b4a75708 1507
606828e4
MD		 1508 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1509 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1510 ret = 0;
1511 break;
b4a75708 1512
606828e4
MD		 1513 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1514 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1515 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1516 default:
1517 WARN_ON_ONCE(1);
1518 }
1519 if (!ret)
a67ba386 1520 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1521}
1522
1523static
1524int _lttng_event_notifier_unregister(
a67ba386 1525 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1526{
437d5aa5 1527 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1528 int ret = -EINVAL;
1529
a67ba386 1530 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1531 return 0;
1532
a67ba386
MD		 1533 desc = event_notifier->priv->parent.desc;
1534 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1535 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386
MD		 1536 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
1537 event_notifier->priv->parent.desc->event_notifier_callback,
b01155ba
FD		 1538 event_notifier);
1539 break;
b4a75708 1540
606828e4 1541 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1542 lttng_kprobes_unregister_event_notifier(event_notifier);
1543 ret = 0;
1544 break;
b4a75708 1545
606828e4 1546 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1547 lttng_uprobes_unregister_event_notifier(event_notifier);
1548 ret = 0;
1549 break;
b4a75708 1550
606828e4 1551 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1552 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1553 break;
b4a75708 1554
606828e4
MD		 1555 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1556 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1557 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1558 default:
1559 WARN_ON_ONCE(1);
1560 }
1561 if (!ret)
a67ba386 1562 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1563 return ret;
1564}
1565
dda6a249
MD		 1566/*
1567 * Only used internally at session destruction.
1568 */
be066e6c 1569static
0648898e 1570void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1571{
0648898e 1572 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1573 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1574
0648898e
MD		 1575 lttng_free_event_filter_runtime(event);
1576 /* Free event enabler refs */
1577 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1578 &event_priv->enablers_ref_head, node)
1579 kfree(enabler_ref);
b4a75708 1580
0648898e
MD		 1581 switch (event->type) {
1582 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1583 {
1584 struct lttng_kernel_event_recorder *event_recorder =
1585 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1586
0648898e
MD		 1587 switch (event_priv->instrumentation) {
1588 case LTTNG_KERNEL_ABI_TRACEPOINT:
1589 lttng_event_desc_put(event_priv->desc);
1590 break;
b4a75708 1591
0648898e
MD		 1592 case LTTNG_KERNEL_ABI_KPROBE:
1593 module_put(event_priv->desc->owner);
1594 lttng_kprobes_destroy_event_private(event_recorder);
1595 break;
b4a75708 1596
0648898e
MD		 1597 case LTTNG_KERNEL_ABI_KRETPROBE:
1598 module_put(event_priv->desc->owner);
1599 lttng_kretprobes_destroy_private(event_recorder);
1600 break;
b4a75708 1601
0648898e
MD		 1602 case LTTNG_KERNEL_ABI_SYSCALL:
1603 break;
4e3c1b9b 1604
0648898e
MD		 1605 case LTTNG_KERNEL_ABI_UPROBE:
1606 module_put(event_priv->desc->owner);
1607 lttng_uprobes_destroy_event_private(event_recorder);
1608 break;
3ef5cc03 1609
0648898e
MD		 1610 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1611 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1612 default:
1613 WARN_ON_ONCE(1);
1614 }
1615 list_del(&event_recorder->priv->node);
1616 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1617 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1618 break;
0648898e
MD		 1619 }
1620 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1621 {
1622 struct lttng_kernel_event_notifier *event_notifier =
1623 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1624
0648898e
MD		 1625 switch (event_notifier->priv->parent.instrumentation) {
1626 case LTTNG_KERNEL_ABI_TRACEPOINT:
1627 lttng_event_desc_put(event_notifier->priv->parent.desc);
1628 break;
b4a75708 1629
0648898e
MD		 1630 case LTTNG_KERNEL_ABI_KPROBE:
1631 module_put(event_notifier->priv->parent.desc->owner);
1632 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1633 break;
b4a75708 1634
0648898e
MD		 1635 case LTTNG_KERNEL_ABI_SYSCALL:
1636 break;
b4a75708 1637
0648898e
MD		 1638 case LTTNG_KERNEL_ABI_UPROBE:
1639 module_put(event_notifier->priv->parent.desc->owner);
1640 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1641 break;
1642
1643 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1644 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1645 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1646 default:
1647 WARN_ON_ONCE(1);
1648 }
1649 list_del(&event_notifier->priv->node);
1650 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1651 kmem_cache_free(event_notifier_cache, event_notifier);
1652 break;
1653 }
dffef45d
FD		 1654 default:
1655 WARN_ON_ONCE(1);
1656 }
dffef45d
FD		 1657}
1658
d1f652f8
MD		 1659struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1660 enum tracker_type tracker_type)
e0130fab 1661{
d1f652f8
MD		 1662 switch (tracker_type) {
1663 case TRACKER_PID:
1664 return &session->pid_tracker;
1665 case TRACKER_VPID:
1666 return &session->vpid_tracker;
1667 case TRACKER_UID:
1668 return &session->uid_tracker;
1669 case TRACKER_VUID:
1670 return &session->vuid_tracker;
1671 case TRACKER_GID:
1672 return &session->gid_tracker;
1673 case TRACKER_VGID:
1674 return &session->vgid_tracker;
1675 default:
1676 WARN_ON_ONCE(1);
1677 return NULL;
1678 }
1679}
1680
1681int lttng_session_track_id(struct lttng_session *session,
1682 enum tracker_type tracker_type, int id)
1683{
1684 struct lttng_id_tracker *tracker;
e0130fab
MD		 1685 int ret;
1686
d1f652f8
MD		 1687 tracker = get_tracker(session, tracker_type);
1688 if (!tracker)
1689 return -EINVAL;
1690 if (id < -1)
e0130fab
MD		 1691 return -EINVAL;
1692 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1693 if (id == -1) {
1694 /* track all ids: destroy tracker. */
1695 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1696 ret = 0;
1697 } else {
d1f652f8 1698 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1699 }
e0130fab
MD		 1700 mutex_unlock(&sessions_mutex);
1701 return ret;
1702}
1703
d1f652f8
MD		 1704int lttng_session_untrack_id(struct lttng_session *session,
1705 enum tracker_type tracker_type, int id)
e0130fab 1706{
d1f652f8 1707 struct lttng_id_tracker *tracker;
e0130fab
MD		 1708 int ret;
1709
d1f652f8
MD		 1710 tracker = get_tracker(session, tracker_type);
1711 if (!tracker)
1712 return -EINVAL;
1713 if (id < -1)
e0130fab
MD		 1714 return -EINVAL;
1715 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1716 if (id == -1) {
1717 /* untrack all ids: replace by empty tracker. */
1718 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1719 } else {
d1f652f8 1720 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1721 }
e0130fab
MD		 1722 mutex_unlock(&sessions_mutex);
1723 return ret;
1724}
1725
7e6f9ef6 1726static
d1f652f8 1727void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1728{
d1f652f8
MD		 1729 struct lttng_id_tracker *id_tracker = m->private;
1730 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1731 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1732 int iter = 0, i;
1733
1734 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1735 if (id_tracker_p) {
1736 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1737 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1738
f934e302 1739 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1740 if (iter++ >= *pos)
1741 return e;
1742 }
1743 }
1744 } else {
d1f652f8 1745 /* ID tracker disabled. */
7e6f9ef6 1746 if (iter >= *pos && iter == 0) {
d1f652f8 1747 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1748 }
1749 iter++;
1750 }
1751 /* End of list */
1752 return NULL;
1753}
1754
1755/* Called with sessions_mutex held. */
1756static
d1f652f8 1757void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1758{
d1f652f8
MD		 1759 struct lttng_id_tracker *id_tracker = m->private;
1760 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1761 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1762 int iter = 0, i;
1763
1764 (*ppos)++;
d1f652f8
MD		 1765 if (id_tracker_p) {
1766 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1767 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1768
f934e302 1769 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1770 if (iter++ >= *ppos)
1771 return e;
1772 }
1773 }
1774 } else {
d1f652f8 1775 /* ID tracker disabled. */
7e6f9ef6 1776 if (iter >= *ppos && iter == 0)
d1f652f8 1777 return p; /* empty tracker */
7e6f9ef6
MD		 1778 iter++;
1779 }
1780
1781 /* End of list */
1782 return NULL;
1783}
1784
1785static
d1f652f8 1786void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1787{
1788 mutex_unlock(&sessions_mutex);
1789}
1790
1791static
d1f652f8 1792int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1793{
d1f652f8
MD		 1794 struct lttng_id_tracker *id_tracker = m->private;
1795 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1796 int id;
7e6f9ef6 1797
d1f652f8 1798 if (p == id_tracker_p) {
7e6f9ef6 1799 /* Tracker disabled. */
d1f652f8 1800 id = -1;
7e6f9ef6 1801 } else {
d1f652f8 1802 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1803
d1f652f8
MD		 1804 id = lttng_id_tracker_get_node_id(e);
1805 }
1806 switch (id_tracker->tracker_type) {
1807 case TRACKER_PID:
1808 seq_printf(m, "process { pid = %d; };\n", id);
1809 break;
1810 case TRACKER_VPID:
1811 seq_printf(m, "process { vpid = %d; };\n", id);
1812 break;
1813 case TRACKER_UID:
1814 seq_printf(m, "user { uid = %d; };\n", id);
1815 break;
1816 case TRACKER_VUID:
1817 seq_printf(m, "user { vuid = %d; };\n", id);
1818 break;
1819 case TRACKER_GID:
1820 seq_printf(m, "group { gid = %d; };\n", id);
1821 break;
1822 case TRACKER_VGID:
1823 seq_printf(m, "group { vgid = %d; };\n", id);
1824 break;
1825 default:
1826 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1827 }
7e6f9ef6
MD		 1828 return 0;
1829}
1830
1831static
d1f652f8
MD		 1832const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1833 .start = id_list_start,
1834 .next = id_list_next,
1835 .stop = id_list_stop,
1836 .show = id_list_show,
7e6f9ef6
MD		 1837};
1838
1839static
d1f652f8 1840int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1841{
d1f652f8 1842 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1843}
1844
1845static
d1f652f8 1846int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1847{
1848 struct seq_file *m = file->private_data;
d1f652f8 1849 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1850 int ret;
1851
d1f652f8 1852 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1853 ret = seq_release(inode, file);
d1f652f8
MD		 1854 if (!ret)
1855 fput(id_tracker->session->file);
7e6f9ef6
MD		 1856 return ret;
1857}
1858
d1f652f8 1859const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1860 .owner = THIS_MODULE,
d1f652f8 1861 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1862 .read = seq_read,
1863 .llseek = seq_lseek,
d1f652f8 1864 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1865};
1866
d1f652f8
MD		 1867int lttng_session_list_tracker_ids(struct lttng_session *session,
1868 enum tracker_type tracker_type)
7e6f9ef6 1869{
d1f652f8 1870 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1871 struct seq_file *m;
1872 int file_fd, ret;
1873
1874 file_fd = lttng_get_unused_fd();
1875 if (file_fd < 0) {
1876 ret = file_fd;
1877 goto fd_error;
1878 }
1879
d1f652f8
MD		 1880 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1881 &lttng_tracker_ids_list_fops,
7e6f9ef6 1882 NULL, O_RDWR);
d1f652f8
MD		 1883 if (IS_ERR(tracker_ids_list_file)) {
1884 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1885 goto file_error;
1886 }
98d7281c
MJ		 1887 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1888 ret = -EOVERFLOW;
9c1f4643
MD		 1889 goto refcount_error;
1890 }
d1f652f8 1891 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1892 if (ret < 0)
1893 goto open_error;
d1f652f8
MD		 1894 m = tracker_ids_list_file->private_data;
1895
1896 m->private = get_tracker(session, tracker_type);
1897 BUG_ON(!m->private);
1898 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1899
1900 return file_fd;
1901
1902open_error:
9c1f4643
MD		 1903 atomic_long_dec(&session->file->f_count);
1904refcount_error:
d1f652f8 1905 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1906file_error:
1907 put_unused_fd(file_fd);
1908fd_error:
1909 return ret;
1910}
1911
3c997079
MD		 1912/*
1913 * Enabler management.
1914 */
1915static
4993071a
PP		 1916int lttng_match_enabler_star_glob(const char *desc_name,
1917 const char *pattern)
3c997079 1918{
cbc19040
MD		 1919 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1920 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1921 return 0;
1922 return 1;
1923}
1924
1925static
4ecb5ad5
MD		 1926int lttng_match_enabler_name(const char *desc_name,
1927 const char *name)
3c997079 1928{
4ecb5ad5 1929 if (strcmp(desc_name, name))
3c997079
MD		 1930 return 0;
1931 return 1;
1932}
1933
437d5aa5 1934int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
3c997079
MD		 1935 struct lttng_enabler *enabler)
1936{
4ecb5ad5 1937 const char *desc_name, *enabler_name;
badfe9f5 1938 bool compat = false, entry = false;
4ecb5ad5
MD		 1939
1940 enabler_name = enabler->event_param.name;
1941 switch (enabler->event_param.instrumentation) {
606828e4 1942 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1943 desc_name = desc->event_name;
3b861b22
FD		 1944 switch (enabler->format_type) {
1945 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1946 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1947 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1948 return lttng_match_enabler_name(desc_name, enabler_name);
1949 default:
1950 return -EINVAL;
1951 }
4ecb5ad5 1952 break;
b4a75708 1953
606828e4 1954 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1955 desc_name = desc->event_name;
badfe9f5 1956 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1957 desc_name += strlen("compat_");
badfe9f5
MD		 1958 compat = true;
1959 }
4ecb5ad5
MD		 1960 if (!strncmp(desc_name, "syscall_exit_",
1961 strlen("syscall_exit_"))) {
1962 desc_name += strlen("syscall_exit_");
1963 } else if (!strncmp(desc_name, "syscall_entry_",
1964 strlen("syscall_entry_"))) {
1965 desc_name += strlen("syscall_entry_");
badfe9f5 1966 entry = true;
4ecb5ad5
MD		 1967 } else {
1968 WARN_ON_ONCE(1);
1969 return -EINVAL;
1970 }
badfe9f5 1971 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1972 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1973 break;
606828e4 1974 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1975 if (!entry)
1976 return 0;
1977 break;
606828e4 1978 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1979 if (entry)
1980 return 0;
1981 break;
1982 default:
1983 return -EINVAL;
1984 }
1985 switch (enabler->event_param.u.syscall.abi) {
606828e4 1986 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1987 break;
606828e4 1988 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1989 if (compat)
1990 return 0;
1991 break;
606828e4 1992 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1993 if (!compat)
1994 return 0;
1995 break;
1996 default:
1997 return -EINVAL;
1998 }
1999 switch (enabler->event_param.u.syscall.match) {
606828e4 2000 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2001 switch (enabler->format_type) {
2002 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2003 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2004 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2005 return lttng_match_enabler_name(desc_name, enabler_name);
2006 default:
2007 return -EINVAL;
2008 }
2009 break;
606828e4 2010 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2011 return -EINVAL; /* Not implemented. */
2012 default:
2013 return -EINVAL;
2014 }
4ecb5ad5 2015 break;
b4a75708 2016
4ecb5ad5
MD		 2017 default:
2018 WARN_ON_ONCE(1);
2019 return -EINVAL;
2020 }
3c997079
MD		 2021}
2022
2023static
b2bc0bc8 2024int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2025 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2026{
b2bc0bc8
FD		 2027 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
2028 event_enabler);
2029
a67ba386 2030 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2031 return 0;
a67ba386
MD		 2032 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2033 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2034 return 1;
2035 else
2036 return 0;
2037}
2038
b01155ba
FD		 2039static
2040int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2041 struct lttng_kernel_event_notifier *event_notifier)
b01155ba
FD		 2042{
2043 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
2044 event_notifier_enabler);
2045
a67ba386 2046 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2047 return 0;
a67ba386
MD		 2048 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2049 && event_notifier->priv->group == event_notifier_enabler->group
2050 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2051 return 1;
2052 else
2053 return 0;
2054}
2055
3c997079 2056static
b2bc0bc8
FD		 2057struct lttng_enabler_ref *lttng_enabler_ref(
2058 struct list_head *enablers_ref_list,
3c997079
MD		 2059 struct lttng_enabler *enabler)
2060{
2061 struct lttng_enabler_ref *enabler_ref;
2062
b2bc0bc8 2063 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2064 if (enabler_ref->ref == enabler)
2065 return enabler_ref;
2066 }
2067 return NULL;
2068}
2069
3c997079 2070static
1b917d6b 2071void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2072{
b2bc0bc8 2073 struct lttng_session *session = event_enabler->chan->session;
437d5aa5
MD		 2074 struct lttng_kernel_probe_desc *probe_desc;
2075 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2076 int i;
2077 struct list_head *probe_list;
2078
2079 probe_list = lttng_get_probe_list_head();
2080 /*
2081 * For each probe event, if we find that a probe event matches
2082 * our enabler, create an associated lttng_event if not
2083 * already present.
2084 */
2085 list_for_each_entry(probe_desc, probe_list, head) {
2086 for (i = 0; i < probe_desc->nr_events; i++) {
2087 int found = 0;
2088 struct hlist_head *head;
a67ba386
MD		 2089 struct lttng_kernel_event_recorder_private *event_recorder_private;
2090 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2091
2092 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2093 if (!lttng_desc_match_enabler(desc,
2094 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2095 continue;
3c997079
MD		 2096
2097 /*
2098 * Check if already created.
2099 */
4a11ef1c
FD		 2100 head = utils_borrow_hash_table_bucket(
2101 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2102 desc->event_name);
a67ba386
MD		 2103 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2104 if (event_recorder_private->parent.desc == desc
2105 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2106 found = 1;
2107 }
2108 if (found)
2109 continue;
2110
2111 /*
2112 * We need to create an event for this
2113 * event probe.
2114 */
a67ba386
MD		 2115 event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan,
2116 NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT);
2117 if (!event_recorder) {
5a15f70c 2118 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2119 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2120 }
2121 }
2122 }
2123}
2124
b01155ba
FD		 2125static
2126void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2127{
2128 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2129 struct lttng_kernel_probe_desc *probe_desc;
2130 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2131 int i;
2132 struct list_head *probe_list;
2133
2134 probe_list = lttng_get_probe_list_head();
2135 /*
2136 * For each probe event, if we find that a probe event matches
2137 * our enabler, create an associated lttng_event_notifier if not
2138 * already present.
2139 */
2140 list_for_each_entry(probe_desc, probe_list, head) {
2141 for (i = 0; i < probe_desc->nr_events; i++) {
2142 int found = 0;
2143 struct hlist_head *head;
a67ba386
MD		 2144 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2145 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2146
2147 desc = probe_desc->event_desc[i];
2148 if (!lttng_desc_match_enabler(desc,
2149 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2150 continue;
2151
2152 /*
2153 * Check if already created.
2154 */
2155 head = utils_borrow_hash_table_bucket(
2156 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2157 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2158 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2159 if (event_notifier_priv->parent.desc == desc
2160 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2161 found = 1;
2162 }
2163 if (found)
2164 continue;
2165
2166 /*
2167 * We need to create a event_notifier for this event probe.
2168 */
2169 event_notifier = _lttng_event_notifier_create(desc,
2170 event_notifier_enabler->base.user_token,
99f52fcc 2171 event_notifier_enabler->error_counter_index,
a67ba386 2172 event_notifier_group, NULL,
606828e4 2173 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2174 if (IS_ERR(event_notifier)) {
2175 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2176 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2177 }
2178 }
2179 }
2180}
2181
33a39a3c 2182static
1b917d6b 2183void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2184{
2185 int ret;
2186
a67ba386 2187 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2188 WARN_ON_ONCE(ret);
2189}
2190
8a8ac9a8
FD		 2191static
2192void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2193{
2194 int ret;
2195
a67ba386 2196 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2197 WARN_ON_ONCE(ret);
a67ba386 2198 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2199 WARN_ON_ONCE(ret);
2200}
2201
33a39a3c 2202/*
a67ba386 2203 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2204 * tracepoint probes.
2205 * Should be called with sessions mutex held.
2206 */
2207static
b2bc0bc8 2208void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2209{
b2bc0bc8 2210 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2211 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2212 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2213 break;
b4a75708 2214
606828e4 2215 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2216 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2217 break;
b4a75708 2218
33a39a3c
MD		 2219 default:
2220 WARN_ON_ONCE(1);
2221 break;
2222 }
2223}
2224
3c997079 2225/*
b2bc0bc8 2226 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2227 * and add backward reference from the event to the enabler.
2228 * Should be called with sessions mutex held.
2229 */
2230static
b2bc0bc8 2231int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2232{
b2bc0bc8
FD		 2233 struct lttng_channel *chan = event_enabler->chan;
2234 struct lttng_session *session = event_enabler->chan->session;
2235 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2236 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2237
606828e4
MD		 2238 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2239 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2240 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2241 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2242 int enabled = base_enabler->enabled;
606828e4 2243 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2244
606828e4 2245 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1
MD		 2246 WRITE_ONCE(chan->syscall_all_entry, enabled);
2247
606828e4 2248 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1 2249 WRITE_ONCE(chan->syscall_all_exit, enabled);
badfe9f5
MD		 2250 }
2251
3c997079 2252 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2253 lttng_create_event_if_missing(event_enabler);
3c997079 2254
b2bc0bc8 2255 /* For each event matching event_enabler in session event list. */
a67ba386
MD		 2256 list_for_each_entry(event_recorder_priv, &session->events, node) {
2257 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2258 struct lttng_enabler_ref *enabler_ref;
2259
a67ba386 2260 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2261 continue;
a67ba386 2262 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2263 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2264 if (!enabler_ref) {
2265 /*
2266 * If no backward ref, create it.
b2bc0bc8 2267 * Add backward ref from event to event_enabler.
3c997079
MD		 2268 */
2269 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2270 if (!enabler_ref)
2271 return -ENOMEM;
b2bc0bc8 2272 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2273 list_add(&enabler_ref->node,
a67ba386 2274 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2275 }
2276
f127e61e
MD		 2277 /*
2278 * Link filter bytecodes if not linked yet.
2279 */
a67ba386 2280 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2281 lttng_static_ctx,
a67ba386 2282 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2283 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2284 }
2285 return 0;
2286}
2287
b01155ba 2288/*
a67ba386 2289 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2290 * tracepoint probes.
2291 * Should be called with sessions mutex held.
2292 */
2293static
2294void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2295{
2296 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2297 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2298 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2299 break;
b4a75708 2300
606828e4 2301 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2302 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2303 break;
b4a75708 2304
b01155ba
FD		 2305 default:
2306 WARN_ON_ONCE(1);
2307 break;
2308 }
2309}
2310
2311/*
2312 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2313 */
2314static
8a8ac9a8
FD		 2315int lttng_event_notifier_enabler_ref_event_notifiers(
2316 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2317{
2318 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2319 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2320 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2321
606828e4
MD		 2322 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2323 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2324 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2325 !strcmp(base_enabler->event_param.name, "*")) {
2326
2327 int enabled = base_enabler->enabled;
606828e4 2328 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2329
606828e4 2330 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2331 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2332
606828e4 2333 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2334 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2335
2336 }
2337
b01155ba
FD		 2338 /* First ensure that probe event_notifiers are created for this enabler. */
2339 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2340
2341 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2342 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2343 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2344 struct lttng_enabler_ref *enabler_ref;
2345
2346 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2347 continue;
2348
a67ba386 2349 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2350 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2351 if (!enabler_ref) {
2352 /*
2353 * If no backward ref, create it.
2354 * Add backward ref from event_notifier to enabler.
2355 */
2356 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2357 if (!enabler_ref)
2358 return -ENOMEM;
2359
2360 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2361 event_notifier_enabler);
2362 list_add(&enabler_ref->node,
a67ba386 2363 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2364 }
2365
2366 /*
2367 * Link filter bytecodes if not linked yet.
2368 */
a67ba386
MD		 2369 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2370 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2371 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2372
2373 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2374 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2375 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2376 &event_notifier_enabler->capture_bytecode_head);
2377
a67ba386 2378 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2379 }
2380 return 0;
2381}
2382
3c997079
MD		 2383/*
2384 * Called at module load: connect the probe on all enablers matching
2385 * this event.
2386 * Called with sessions lock held.
2387 */
2388int lttng_fix_pending_events(void)
2389{
2390 struct lttng_session *session;
2391
2392 list_for_each_entry(session, &sessions, list)
b2bc0bc8 2393 lttng_session_lazy_sync_event_enablers(session);
3c997079
MD		 2394 return 0;
2395}
2396
b01155ba
FD		 2397static bool lttng_event_notifier_group_has_active_event_notifiers(
2398 struct lttng_event_notifier_group *event_notifier_group)
2399{
2400 struct lttng_event_notifier_enabler *event_notifier_enabler;
2401
2402 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2403 node) {
2404 if (event_notifier_enabler->base.enabled)
2405 return true;
2406 }
2407 return false;
2408}
2409
2410bool lttng_event_notifier_active(void)
2411{
2412 struct lttng_event_notifier_group *event_notifier_group;
2413
2414 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2415 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2416 return true;
2417 }
2418 return false;
2419}
2420
2421int lttng_fix_pending_event_notifiers(void)
2422{
2423 struct lttng_event_notifier_group *event_notifier_group;
2424
2425 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2426 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2427 return 0;
2428}
2429
b2bc0bc8
FD		 2430struct lttng_event_enabler *lttng_event_enabler_create(
2431 enum lttng_enabler_format_type format_type,
606828e4 2432 struct lttng_kernel_abi_event *event_param,
3c997079
MD		 2433 struct lttng_channel *chan)
2434{
b2bc0bc8 2435 struct lttng_event_enabler *event_enabler;
3c997079 2436
b2bc0bc8
FD		 2437 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2438 if (!event_enabler)
3c997079 2439 return NULL;
b2bc0bc8
FD		 2440 event_enabler->base.format_type = format_type;
2441 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2442 memcpy(&event_enabler->base.event_param, event_param,
2443 sizeof(event_enabler->base.event_param));
2444 event_enabler->chan = chan;
3c997079 2445 /* ctx left NULL */
b2bc0bc8 2446 event_enabler->base.enabled = 0;
3c997079 2447 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2448 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2449 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2450 mutex_unlock(&sessions_mutex);
b2bc0bc8 2451 return event_enabler;
3c997079
MD		 2452}
2453
b2bc0bc8 2454int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2455{
2456 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2457 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2458 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2459 mutex_unlock(&sessions_mutex);
2460 return 0;
2461}
2462
b2bc0bc8 2463int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2464{
2465 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2466 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2467 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2468 mutex_unlock(&sessions_mutex);
2469 return 0;
2470}
2471
b2bc0bc8 2472static
183e8b3a 2473int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
606828e4 2474 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2475{
89ec2b91 2476 struct lttng_bytecode_node *bytecode_node;
07dfc1d0
MD		 2477 uint32_t bytecode_len;
2478 int ret;
2479
2480 ret = get_user(bytecode_len, &bytecode->len);
2481 if (ret)
2482 return ret;
52cfcdf3 2483 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2484 GFP_KERNEL);
2485 if (!bytecode_node)
2486 return -ENOMEM;
2487 ret = copy_from_user(&bytecode_node->bc, bytecode,
2488 sizeof(*bytecode) + bytecode_len);
2489 if (ret)
2490 goto error_free;
b2bc0bc8 2491
89ec2b91 2492 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER;
07dfc1d0
MD		 2493 bytecode_node->enabler = enabler;
2494 /* Enforce length based on allocated size */
2495 bytecode_node->bc.len = bytecode_len;
2496 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2497
07dfc1d0
MD		 2498 return 0;
2499
2500error_free:
52cfcdf3 2501 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2502 return ret;
2503}
2504
183e8b3a 2505int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2506 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2507{
2508 int ret;
183e8b3a 2509 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2510 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2511 if (ret)
2512 goto error;
2513
2514 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2515 return 0;
2516
2517error:
2518 return ret;
2519}
2520
a67ba386 2521int lttng_event_add_callsite(struct lttng_kernel_event_recorder *event_recorder,
606828e4 2522 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2523{
2524
a67ba386 2525 switch (event_recorder->priv->parent.instrumentation) {
606828e4 2526 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 2527 return lttng_uprobes_event_add_callsite(event_recorder, callsite);
3aed4dca
FD		 2528 default:
2529 return -EINVAL;
2530 }
2531}
2532
3c997079
MD		 2533static
2534void lttng_enabler_destroy(struct lttng_enabler *enabler)
2535{
89ec2b91 2536 struct lttng_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2537
2538 /* Destroy filter bytecode */
2539 list_for_each_entry_safe(filter_node, tmp_filter_node,
2540 &enabler->filter_bytecode_head, node) {
52cfcdf3 2541 lttng_kvfree(filter_node);
07dfc1d0 2542 }
b2bc0bc8
FD		 2543}
2544
2545static
2546void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2547{
2548 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2549
b2bc0bc8
FD		 2550 list_del(&event_enabler->node);
2551 kfree(event_enabler);
3c997079
MD		 2552}
2553
dffef45d
FD		 2554struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2555 struct lttng_event_notifier_group *event_notifier_group,
2556 enum lttng_enabler_format_type format_type,
606828e4 2557 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2558{
2559 struct lttng_event_notifier_enabler *event_notifier_enabler;
2560
2561 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2562 if (!event_notifier_enabler)
2563 return NULL;
2564
2565 event_notifier_enabler->base.format_type = format_type;
2566 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2567 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2568
99f52fcc 2569 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2570 event_notifier_enabler->num_captures = 0;
dffef45d 2571
8a8ac9a8
FD		 2572 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2573 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2574
2575 event_notifier_enabler->base.enabled = 0;
2576 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2577 event_notifier_enabler->group = event_notifier_group;
2578
2579 mutex_lock(&sessions_mutex);
2580 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2581 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2582
2583 mutex_unlock(&sessions_mutex);
2584
2585 return event_notifier_enabler;
2586}
2587
2588int lttng_event_notifier_enabler_enable(
2589 struct lttng_event_notifier_enabler *event_notifier_enabler)
2590{
2591 mutex_lock(&sessions_mutex);
2592 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2593 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2594 mutex_unlock(&sessions_mutex);
2595 return 0;
2596}
2597
2598int lttng_event_notifier_enabler_disable(
2599 struct lttng_event_notifier_enabler *event_notifier_enabler)
2600{
2601 mutex_lock(&sessions_mutex);
2602 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2603 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2604 mutex_unlock(&sessions_mutex);
2605 return 0;
2606}
2607
183e8b3a 2608int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2609 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2610 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2611{
2612 int ret;
2613
183e8b3a 2614 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2615 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2616 bytecode);
2617 if (ret)
2618 goto error;
2619
b01155ba 2620 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2621 return 0;
2622
2623error:
2624 return ret;
2625}
2626
99d223ad
FD		 2627int lttng_event_notifier_enabler_attach_capture_bytecode(
2628 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2629 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad
FD		 2630{
2631 struct lttng_bytecode_node *bytecode_node;
2632 struct lttng_enabler *enabler =
2633 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2634 uint32_t bytecode_len;
2635 int ret;
2636
2637 ret = get_user(bytecode_len, &bytecode->len);
2638 if (ret)
2639 return ret;
2640
2641 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2642 GFP_KERNEL);
2643 if (!bytecode_node)
2644 return -ENOMEM;
2645
2646 ret = copy_from_user(&bytecode_node->bc, bytecode,
2647 sizeof(*bytecode) + bytecode_len);
2648 if (ret)
2649 goto error_free;
2650
2651 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE;
2652 bytecode_node->enabler = enabler;
2653
2654 /* Enforce length based on allocated size */
2655 bytecode_node->bc.len = bytecode_len;
2656 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2657
2658 event_notifier_enabler->num_captures++;
2659
2660 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2661 goto end;
2662
2663error_free:
2664 lttng_kvfree(bytecode_node);
2665end:
2666 return ret;
2667}
2668
a67ba386 2669int lttng_event_notifier_add_callsite(struct lttng_kernel_event_notifier *event_notifier,
606828e4 2670 struct lttng_kernel_abi_event_callsite __user *callsite)
9de67196
FD		 2671{
2672
a67ba386 2673 switch (event_notifier->priv->parent.instrumentation) {
606828e4 2674 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 2675 return lttng_uprobes_event_notifier_add_callsite(event_notifier,
2676 callsite);
2677 default:
2678 return -EINVAL;
2679 }
2680}
2681
dffef45d
FD		 2682static
2683void lttng_event_notifier_enabler_destroy(
2684 struct lttng_event_notifier_enabler *event_notifier_enabler)
2685{
2686 if (!event_notifier_enabler) {
2687 return;
2688 }
2689
2690 list_del(&event_notifier_enabler->node);
2691
2692 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2693 kfree(event_notifier_enabler);
2694}
2695
3c997079 2696/*
b2bc0bc8 2697 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2698 * session.
2699 * Should be called with sessions mutex held.
2700 */
2701static
b2bc0bc8 2702void lttng_session_sync_event_enablers(struct lttng_session *session)
3c997079 2703{
b2bc0bc8 2704 struct lttng_event_enabler *event_enabler;
a67ba386 2705 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2706
b2bc0bc8
FD		 2707 list_for_each_entry(event_enabler, &session->enablers_head, node)
2708 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2709 /*
2710 * For each event, if at least one of its enablers is enabled,
2711 * and its channel and session transient states are enabled, we
2712 * enable the event, else we disable it.
2713 */
a67ba386
MD		 2714 list_for_each_entry(event_recorder_priv, &session->events, node) {
2715 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2716 struct lttng_enabler_ref *enabler_ref;
07dfc1d0
MD		 2717 struct lttng_bytecode_runtime *runtime;
2718 int enabled = 0, has_enablers_without_bytecode = 0;
3c997079 2719
a67ba386 2720 switch (event_recorder_priv->parent.instrumentation) {
606828e4
MD		 2721 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2722 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2723 /* Enable events */
2724 list_for_each_entry(enabler_ref,
a67ba386 2725 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2726 if (enabler_ref->ref->enabled) {
2727 enabled = 1;
2728 break;
2729 }
2730 }
4ecb5ad5 2731 break;
b4a75708 2732
4ecb5ad5 2733 default:
3c997079
MD		 2734 /* Not handled with lazy sync. */
2735 continue;
2736 }
2737 /*
2738 * Enabled state is based on union of enablers, with
2739 * intesection of session and channel transient enable
2740 * states.
2741 */
a67ba386 2742 enabled = enabled && session->tstate && event_recorder->chan->tstate;
3c997079 2743
a67ba386 2744 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2745 /*
2746 * Sync tracepoint registration with event enabled
2747 * state.
2748 */
2749 if (enabled) {
a67ba386 2750 register_event(event_recorder);
3c997079 2751 } else {
a67ba386 2752 _lttng_event_unregister(event_recorder);
3c997079 2753 }
07dfc1d0
MD		 2754
2755 /* Check if has enablers without bytecode enabled */
2756 list_for_each_entry(enabler_ref,
a67ba386 2757 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2758 if (enabler_ref->ref->enabled
2759 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2760 has_enablers_without_bytecode = 1;
2761 break;
2762 }
2763 }
a67ba386 2764 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
07dfc1d0
MD		 2765 has_enablers_without_bytecode;
2766
2767 /* Enable filters */
2768 list_for_each_entry(runtime,
a67ba386 2769 &event_recorder_priv->parent.filter_bytecode_runtime_head, node)
0b365677 2770 lttng_bytecode_filter_sync_state(runtime);
3c997079
MD		 2771 }
2772}
2773
2774/*
2775 * Apply enablers to session events, adding events to session if need
2776 * be. It is required after each modification applied to an active
2777 * session, and right before session "start".
2778 * "lazy" sync means we only sync if required.
2779 * Should be called with sessions mutex held.
2780 */
2781static
b2bc0bc8 2782void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
3c997079
MD		 2783{
2784 /* We can skip if session is not active */
2785 if (!session->active)
2786 return;
b2bc0bc8 2787 lttng_session_sync_event_enablers(session);
3c997079
MD		 2788}
2789
b01155ba
FD		 2790static
2791void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2792{
2793 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2794 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2795
2796 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2797 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2798
2799 /*
2800 * For each event_notifier, if at least one of its enablers is enabled,
2801 * we enable the event_notifier, else we disable it.
2802 */
a67ba386
MD		 2803 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2804 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2805 struct lttng_enabler_ref *enabler_ref;
2806 struct lttng_bytecode_runtime *runtime;
2807 int enabled = 0, has_enablers_without_bytecode = 0;
2808
a67ba386 2809 switch (event_notifier_priv->parent.instrumentation) {
606828e4
MD		 2810 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2811 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2812 /* Enable event_notifiers */
2813 list_for_each_entry(enabler_ref,
a67ba386 2814 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2815 if (enabler_ref->ref->enabled) {
2816 enabled = 1;
2817 break;
2818 }
2819 }
2820 break;
b4a75708 2821
b01155ba
FD		 2822 default:
2823 /* Not handled with sync. */
2824 continue;
2825 }
2826
a67ba386 2827 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2828 /*
2829 * Sync tracepoint registration with event_notifier enabled
2830 * state.
2831 */
2832 if (enabled) {
a67ba386 2833 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2834 register_event_notifier(event_notifier);
2835 } else {
a67ba386 2836 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2837 _lttng_event_notifier_unregister(event_notifier);
2838 }
2839
2840 /* Check if has enablers without bytecode enabled */
2841 list_for_each_entry(enabler_ref,
a67ba386 2842 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2843 if (enabler_ref->ref->enabled
2844 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2845 has_enablers_without_bytecode = 1;
2846 break;
2847 }
2848 }
a67ba386 2849 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
b01155ba
FD		 2850 has_enablers_without_bytecode;
2851
2852 /* Enable filters */
2853 list_for_each_entry(runtime,
a67ba386 2854 &event_notifier_priv->parent.filter_bytecode_runtime_head, node)
0b365677 2855 lttng_bytecode_filter_sync_state(runtime);
99d223ad
FD		 2856
2857 /* Enable captures */
2858 list_for_each_entry(runtime,
a67ba386 2859 &event_notifier_priv->capture_bytecode_runtime_head, node)
99d223ad 2860 lttng_bytecode_capture_sync_state(runtime);
c3eddb2e 2861
a67ba386 2862 WRITE_ONCE(event_notifier->eval_capture, !!event_notifier_priv->num_captures);
b01155ba
FD		 2863 }
2864}
2865
1ec3f75a 2866/*
d83004aa
JD		 2867 * Serialize at most one packet worth of metadata into a metadata
2868 * channel.
92d9f5e6
MD		 2869 * We grab the metadata cache mutex to get exclusive access to our metadata
2870 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2871 * allows us to do racy operations such as looking for remaining space left in
2872 * packet and write, since mutual exclusion protects us from concurrent writes.
2873 * Mutual exclusion on the metadata cache allow us to read the cache content
2874 * without racing against reallocation of the cache by updates.
35097f36
JD		 2875 * Returns the number of bytes written in the channel, 0 if no data
2876 * was written and a negative value on error.
1ec3f75a 2877 */
b3b8072b 2878int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2879 struct channel *chan, bool *coherent)
d83004aa
JD		 2880{
2881 struct lib_ring_buffer_ctx ctx;
2882 int ret = 0;
2883 size_t len, reserve_len;
2884
f613e3e6 2885 /*
92d9f5e6
MD		 2886 * Ensure we support mutiple get_next / put sequences followed by
2887 * put_next. The metadata cache lock protects reading the metadata
2888 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2889 * "flush" operations on the buffer invoked by different processes.
2890 * Moreover, since the metadata cache memory can be reallocated, we
2891 * need to have exclusive access against updates even though we only
2892 * read it.
f613e3e6 2893 */
92d9f5e6 2894 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2895 WARN_ON(stream->metadata_in < stream->metadata_out);
2896 if (stream->metadata_in != stream->metadata_out)
de23d59d 2897 goto end;
f613e3e6 2898
9616f0bf
JD		 2899 /* Metadata regenerated, change the version. */
2900 if (stream->metadata_cache->version != stream->version)
2901 stream->version = stream->metadata_cache->version;
2902
d83004aa 2903 len = stream->metadata_cache->metadata_written -
f613e3e6 2904 stream->metadata_in;
9de2c215 2905 if (!len)
de23d59d 2906 goto end;
d83004aa 2907 reserve_len = min_t(size_t,
b3b8072b 2908 stream->transport->ops.packet_avail_size(chan),
d83004aa 2909 len);
b3b8072b 2910 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
d83004aa
JD		 2911 sizeof(char), -1);
2912 /*
2913 * If reservation failed, return an error to the caller.
2914 */
b3b8072b 2915 ret = stream->transport->ops.event_reserve(&ctx, 0);
d83004aa
JD		 2916 if (ret != 0) {
2917 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2918 stream->coherent = false;
d83004aa
JD		 2919 goto end;
2920 }
b3b8072b 2921 stream->transport->ops.event_write(&ctx,
f613e3e6 2922 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2923 reserve_len);
b3b8072b 2924 stream->transport->ops.event_commit(&ctx);
f613e3e6 2925 stream->metadata_in += reserve_len;
3e75e2a7 2926 if (reserve_len < len)
8b97fd42
MD		 2927 stream->coherent = false;
2928 else
2929 stream->coherent = true;
d83004aa
JD		 2930 ret = reserve_len;
2931
2932end:
8b97fd42
MD		 2933 if (coherent)
2934 *coherent = stream->coherent;
92d9f5e6 2935 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2936 return ret;
2937}
2938
8b97fd42
MD		 2939static
2940void lttng_metadata_begin(struct lttng_session *session)
2941{
3e75e2a7
MD		 2942 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2943 mutex_lock(&session->metadata_cache->lock);
8b97fd42
MD		 2944}
2945
2946static
2947void lttng_metadata_end(struct lttng_session *session)
2948{
3e75e2a7
MD		 2949 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2950 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2951 struct lttng_metadata_stream *stream;
2952
3e75e2a7
MD		 2953 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2954 wake_up_interruptible(&stream->read_wait);
92143b2c 2955 mutex_unlock(&session->metadata_cache->lock);
3e75e2a7 2956 }
8b97fd42
MD		 2957}
2958
d83004aa
JD		 2959/*
2960 * Write the metadata to the metadata cache.
2961 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2962 * The metadata cache lock protects us from concurrent read access from
2963 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2964 * The content of the printf is printed as a single atomic metadata
2965 * transaction.
d83004aa 2966 */
a90917c3 2967int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 2968 const char *fmt, ...)
2969{
c099397a 2970 char *str;
d83004aa 2971 size_t len;
c099397a
MD		 2972 va_list ap;
2973
585e5dcc 2974 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2975
2976 va_start(ap, fmt);
2977 str = kvasprintf(GFP_KERNEL, fmt, ap);
2978 va_end(ap);
2979 if (!str)
2980 return -ENOMEM;
2981
1ec3f75a 2982 len = strlen(str);
3e75e2a7 2983 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 2984 if (session->metadata_cache->metadata_written + len >
2985 session->metadata_cache->cache_alloc) {
2986 char *tmp_cache_realloc;
2987 unsigned int tmp_cache_alloc_size;
2988
2989 tmp_cache_alloc_size = max_t(unsigned int,
2990 session->metadata_cache->cache_alloc + len,
2991 session->metadata_cache->cache_alloc << 1);
0ca42eb7 2992 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2993 if (!tmp_cache_realloc)
2994 goto err;
a606b6e8
ML		 2995 if (session->metadata_cache->data) {
2996 memcpy(tmp_cache_realloc,
2997 session->metadata_cache->data,
2998 session->metadata_cache->cache_alloc);
2999 vfree(session->metadata_cache->data);
3000 }
3001
d83004aa
JD		 3002 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3003 session->metadata_cache->data = tmp_cache_realloc;
c099397a 3004 }
d83004aa
JD		 3005 memcpy(session->metadata_cache->data +
3006 session->metadata_cache->metadata_written,
3007 str, len);
3008 session->metadata_cache->metadata_written += len;
c099397a 3009 kfree(str);
d83004aa 3010
d83004aa
JD		 3011 return 0;
3012
3013err:
3014 kfree(str);
3015 return -ENOMEM;
c099397a
MD		 3016}
3017
f513b2bf
MD		 3018static
3019int print_tabs(struct lttng_session *session, size_t nesting)
3020{
3021 size_t i;
3022
3023 for (i = 0; i < nesting; i++) {
3024 int ret;
3025
3026 ret = lttng_metadata_printf(session, " ");
3027 if (ret) {
3028 return ret;
3029 }
3030 }
3031 return 0;
3032}
3033
ceabb767
MD		 3034static
3035int lttng_field_name_statedump(struct lttng_session *session,
437d5aa5 3036 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3037 size_t nesting)
3038{
3039 return lttng_metadata_printf(session, " _%s;\n", field->name);
3040}
3041
3042static
3043int _lttng_integer_type_statedump(struct lttng_session *session,
437d5aa5
MD		 3044 const struct lttng_kernel_type_integer *type,
3045 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3046 size_t nesting)
3047{
3048 int ret;
3049
ceabb767
MD		 3050 ret = print_tabs(session, nesting);
3051 if (ret)
3052 return ret;
3053 ret = lttng_metadata_printf(session,
3054 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3055 type->size,
3056 type->alignment,
3057 type->signedness,
3058 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3059 ? "none"
437d5aa5 3060 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3061 ? "UTF8"
3062 : "ASCII",
437d5aa5 3063 type->base,
ceabb767 3064#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3065 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3066#else
437d5aa5 3067 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3068#endif
3069 );
3070 return ret;
3071}
3072
f513b2bf
MD		 3073/*
3074 * Must be called with sessions_mutex held.
3075 */
3076static
3077int _lttng_struct_type_statedump(struct lttng_session *session,
437d5aa5 3078 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3079 size_t nesting)
3080{
3081 int ret;
3082 uint32_t i, nr_fields;
ceabb767
MD		 3083 unsigned int alignment;
3084
f513b2bf
MD		 3085 ret = print_tabs(session, nesting);
3086 if (ret)
3087 return ret;
3088 ret = lttng_metadata_printf(session,
3089 "struct {\n");
3090 if (ret)
3091 return ret;
437d5aa5 3092 nr_fields = type->nr_fields;
f513b2bf 3093 for (i = 0; i < nr_fields; i++) {
437d5aa5 3094 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3095
437d5aa5 3096 iter_field = type->fields[i];
f513b2bf
MD		 3097 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
3098 if (ret)
3099 return ret;
3100 }
3101 ret = print_tabs(session, nesting);
3102 if (ret)
3103 return ret;
437d5aa5 3104 alignment = type->alignment;
ceabb767
MD		 3105 if (alignment) {
3106 ret = lttng_metadata_printf(session,
3107 "} align(%u)",
3108 alignment);
3109 } else {
3110 ret = lttng_metadata_printf(session,
3111 "}");
3112 }
f513b2bf
MD		 3113 return ret;
3114}
3115
3116/*
3117 * Must be called with sessions_mutex held.
3118 */
3119static
ceabb767 3120int _lttng_struct_field_statedump(struct lttng_session *session,
437d5aa5 3121 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3122 size_t nesting)
3123{
3124 int ret;
3125
3126 ret = _lttng_struct_type_statedump(session,
437d5aa5 3127 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3128 if (ret)
3129 return ret;
ceabb767 3130 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3131}
3132
65c85aa6
MD		 3133/*
3134 * Must be called with sessions_mutex held.
3135 */
3136static
3137int _lttng_variant_type_statedump(struct lttng_session *session,
437d5aa5 3138 const struct lttng_kernel_type_variant *type,
65c85aa6
MD		 3139 size_t nesting)
3140{
3141 int ret;
3142 uint32_t i, nr_choices;
3143
ceabb767
MD		 3144 /*
3145 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3146 */
437d5aa5 3147 if (type->alignment != 0)
ceabb767 3148 return -EINVAL;
65c85aa6
MD		 3149 ret = print_tabs(session, nesting);
3150 if (ret)
3151 return ret;
3152 ret = lttng_metadata_printf(session,
3153 "variant <_%s> {\n",
437d5aa5 3154 type->tag_name);
65c85aa6
MD		 3155 if (ret)
3156 return ret;
437d5aa5 3157 nr_choices = type->nr_choices;
65c85aa6 3158 for (i = 0; i < nr_choices; i++) {
437d5aa5 3159 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3160
437d5aa5 3161 iter_field = type->choices[i];
65c85aa6
MD		 3162 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
3163 if (ret)
3164 return ret;
3165 }
3166 ret = print_tabs(session, nesting);
3167 if (ret)
3168 return ret;
3169 ret = lttng_metadata_printf(session,
3170 "}");
3171 return ret;
3172}
3173
3174/*
3175 * Must be called with sessions_mutex held.
3176 */
3177static
ceabb767 3178int _lttng_variant_field_statedump(struct lttng_session *session,
437d5aa5 3179 const struct lttng_kernel_event_field *field,
65c85aa6
MD		 3180 size_t nesting)
3181{
3182 int ret;
3183
3184 ret = _lttng_variant_type_statedump(session,
437d5aa5 3185 lttng_kernel_get_type_variant(field->type), nesting);
65c85aa6
MD		 3186 if (ret)
3187 return ret;
ceabb767 3188 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3189}
3190
f513b2bf
MD		 3191/*
3192 * Must be called with sessions_mutex held.
3193 */
3194static
ceabb767 3195int _lttng_array_field_statedump(struct lttng_session *session,
437d5aa5 3196 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3197 size_t nesting)
3198{
3199 int ret;
437d5aa5
MD		 3200 const struct lttng_kernel_type_array *array_type;
3201 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3202
437d5aa5
MD		 3203 array_type = lttng_kernel_get_type_array(field->type);
3204 WARN_ON_ONCE(!array_type);
ceabb767 3205
437d5aa5 3206 if (array_type->alignment) {
ceabb767 3207 ret = print_tabs(session, nesting);
f513b2bf
MD		 3208 if (ret)
3209 return ret;
ceabb767
MD		 3210 ret = lttng_metadata_printf(session,
3211 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3212 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3213 field->name);
3214 if (ret)
3215 return ret;
3216 }
3217 /*
3218 * Nested compound types: Only array of structures and variants are
3219 * currently supported.
3220 */
437d5aa5 3221 elem_type = array_type->elem_type;
12bb2edb
MD		 3222 switch (elem_type->type) {
3223 case lttng_kernel_type_integer:
437d5aa5
MD		 3224 case lttng_kernel_type_struct:
3225 case lttng_kernel_type_variant:
3226 ret = _lttng_type_statedump(session, elem_type,
3227 array_type->encoding, nesting);
65c85aa6
MD		 3228 if (ret)
3229 return ret;
3230 break;
ceabb767 3231
f513b2bf
MD		 3232 default:
3233 return -EINVAL;
3234 }
3235 ret = lttng_metadata_printf(session,
3236 " _%s[%u];\n",
3237 field->name,
437d5aa5 3238 array_type->length);
f513b2bf
MD		 3239 return ret;
3240}
3241
3242/*
3243 * Must be called with sessions_mutex held.
3244 */
3245static
ceabb767 3246int _lttng_sequence_field_statedump(struct lttng_session *session,
437d5aa5 3247 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3248 size_t nesting)
3249{
3250 int ret;
3251 const char *length_name;
437d5aa5
MD		 3252 const struct lttng_kernel_type_sequence *sequence_type;
3253 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3254
437d5aa5
MD		 3255 sequence_type = lttng_kernel_get_type_sequence(field->type);
3256 WARN_ON_ONCE(!sequence_type);
f513b2bf 3257
437d5aa5 3258 length_name = sequence_type->length_name;
ceabb767 3259
437d5aa5 3260 if (sequence_type->alignment) {
ceabb767 3261 ret = print_tabs(session, nesting);
f513b2bf
MD		 3262 if (ret)
3263 return ret;
ceabb767
MD		 3264 ret = lttng_metadata_printf(session,
3265 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3266 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3267 field->name);
3268 if (ret)
3269 return ret;
3270 }
3271
3272 /*
3273 * Nested compound types: Only array of structures and variants are
3274 * currently supported.
3275 */
437d5aa5 3276 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3277 switch (elem_type->type) {
3278 case lttng_kernel_type_integer:
437d5aa5
MD		 3279 case lttng_kernel_type_struct:
3280 case lttng_kernel_type_variant:
3281 ret = _lttng_type_statedump(session, elem_type,
3282 sequence_type->encoding, nesting);
65c85aa6
MD		 3283 if (ret)
3284 return ret;
3285 break;
ceabb767 3286
f513b2bf
MD		 3287 default:
3288 return -EINVAL;
3289 }
3290 ret = lttng_metadata_printf(session,
3291 " _%s[ _%s ];\n",
3292 field->name,
437d5aa5 3293 sequence_type->length_name);
f513b2bf
MD		 3294 return ret;
3295}
3296
141ddf28
MD		 3297/*
3298 * Must be called with sessions_mutex held.
3299 */
3300static
ceabb767 3301int _lttng_enum_type_statedump(struct lttng_session *session,
437d5aa5 3302 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3303 size_t nesting)
3304{
d96a4a7a 3305 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3306 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3307 int ret;
3308 unsigned int i, nr_entries;
3309
437d5aa5 3310 container_type = type->container_type;
12bb2edb 3311 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3312 ret = -EINVAL;
3313 goto end;
3314 }
437d5aa5 3315 enum_desc = type->desc;
141ddf28
MD		 3316 nr_entries = enum_desc->nr_entries;
3317
3318 ret = print_tabs(session, nesting);
3319 if (ret)
3320 goto end;
ceabb767
MD		 3321 ret = lttng_metadata_printf(session, "enum : ");
3322 if (ret)
3323 goto end;
437d5aa5
MD		 3324 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3325 lttng_kernel_string_encoding_none, 0);
141ddf28 3326 if (ret)
ceabb767
MD		 3327 goto end;
3328 ret = lttng_metadata_printf(session, " {\n");
3329 if (ret)
3330 goto end;
141ddf28
MD		 3331 /* Dump all entries */
3332 for (i = 0; i < nr_entries; i++) {
437d5aa5 3333 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3334 int j, len;
3335
3336 ret = print_tabs(session, nesting + 1);
3337 if (ret)
3338 goto end;
3339 ret = lttng_metadata_printf(session,
3340 "\"");
3341 if (ret)
3342 goto end;
3343 len = strlen(entry->string);
3344 /* Escape the character '"' */
3345 for (j = 0; j < len; j++) {
3346 char c = entry->string[j];
3347
3348 switch (c) {
3349 case '"':
3350 ret = lttng_metadata_printf(session,
3351 "\\\"");
3352 break;
3353 case '\\':
3354 ret = lttng_metadata_printf(session,
3355 "\\\\");
3356 break;
3357 default:
3358 ret = lttng_metadata_printf(session,
3359 "%c", c);
3360 break;
3361 }
3362 if (ret)
3363 goto end;
3364 }
08ad1061
PP		 3365 ret = lttng_metadata_printf(session, "\"");
3366 if (ret)
3367 goto end;
3368
3369 if (entry->options.is_auto) {
3370 ret = lttng_metadata_printf(session, ",\n");
3371 if (ret)
3372 goto end;
141ddf28 3373 } else {
7c559490
MD		 3374 ret = lttng_metadata_printf(session,
3375 " = ");
3376 if (ret)
3377 goto end;
3378 if (entry->start.signedness)
141ddf28 3379 ret = lttng_metadata_printf(session,
7c559490
MD		 3380 "%lld", (long long) entry->start.value);
3381 else
3382 ret = lttng_metadata_printf(session,
3383 "%llu", entry->start.value);
3384 if (ret)
3385 goto end;
3386 if (entry->start.signedness == entry->end.signedness &&
3387 entry->start.value
3388 == entry->end.value) {
141ddf28 3389 ret = lttng_metadata_printf(session,
7c559490
MD		 3390 ",\n");
3391 } else {
3392 if (entry->end.signedness) {
3393 ret = lttng_metadata_printf(session,
3394 " ... %lld,\n",
3395 (long long) entry->end.value);
3396 } else {
3397 ret = lttng_metadata_printf(session,
3398 " ... %llu,\n",
3399 entry->end.value);
3400 }
141ddf28 3401 }
7c559490
MD		 3402 if (ret)
3403 goto end;
141ddf28 3404 }
141ddf28
MD		 3405 }
3406 ret = print_tabs(session, nesting);
3407 if (ret)
3408 goto end;
ceabb767 3409 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3410end:
3411 return ret;
3412}
3413
d83004aa
JD		 3414/*
3415 * Must be called with sessions_mutex held.
3416 */
c099397a 3417static
ceabb767 3418int _lttng_enum_field_statedump(struct lttng_session *session,
437d5aa5 3419 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3420 size_t nesting)
3421{
3422 int ret;
437d5aa5 3423 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3424
437d5aa5
MD		 3425 enum_type = lttng_kernel_get_type_enum(field->type);
3426 WARN_ON_ONCE(!enum_type);
3427 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3428 if (ret)
3429 return ret;
3430 return lttng_field_name_statedump(session, field, nesting);
3431}
3432
3433static
3434int _lttng_integer_field_statedump(struct lttng_session *session,
437d5aa5 3435 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3436 size_t nesting)
3437{
3438 int ret;
3439
437d5aa5
MD		 3440 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3441 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3442 if (ret)
3443 return ret;
3444 return lttng_field_name_statedump(session, field, nesting);
3445}
3446
3447static
3448int _lttng_string_type_statedump(struct lttng_session *session,
437d5aa5 3449 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3450 size_t nesting)
3451{
3452 int ret;
3453
ceabb767
MD		 3454 /* Default encoding is UTF8 */
3455 ret = print_tabs(session, nesting);
3456 if (ret)
3457 return ret;
3458 ret = lttng_metadata_printf(session,
3459 "string%s",
437d5aa5 3460 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3461 " { encoding = ASCII; }" : "");
3462 return ret;
3463}
3464
3465static
3466int _lttng_string_field_statedump(struct lttng_session *session,
437d5aa5 3467 const struct lttng_kernel_event_field *field,
f513b2bf 3468 size_t nesting)
ceabb767 3469{
437d5aa5 3470 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3471 int ret;
3472
437d5aa5
MD		 3473 string_type = lttng_kernel_get_type_string(field->type);
3474 WARN_ON_ONCE(!string_type);
3475 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3476 if (ret)
3477 return ret;
3478 return lttng_field_name_statedump(session, field, nesting);
3479}
3480
3481/*
3482 * Must be called with sessions_mutex held.
3483 */
3484static
3485int _lttng_type_statedump(struct lttng_session *session,
437d5aa5
MD		 3486 const struct lttng_kernel_type_common *type,
3487 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3488 size_t nesting)
c099397a 3489{
c099397a 3490 int ret = 0;
c099397a 3491
12bb2edb
MD		 3492 switch (type->type) {
3493 case lttng_kernel_type_integer:
437d5aa5
MD		 3494 ret = _lttng_integer_type_statedump(session,
3495 lttng_kernel_get_type_integer(type),
3496 parent_encoding, nesting);
8070f5c0 3497 break;
437d5aa5
MD		 3498 case lttng_kernel_type_enum:
3499 ret = _lttng_enum_type_statedump(session,
3500 lttng_kernel_get_type_enum(type),
3501 nesting);
8070f5c0 3502 break;
12bb2edb 3503 case lttng_kernel_type_string:
437d5aa5
MD		 3504 ret = _lttng_string_type_statedump(session,
3505 lttng_kernel_get_type_string(type),
3506 nesting);
ceabb767 3507 break;
437d5aa5
MD		 3508 case lttng_kernel_type_struct:
3509 ret = _lttng_struct_type_statedump(session,
3510 lttng_kernel_get_type_struct(type),
3511 nesting);
8070f5c0 3512 break;
437d5aa5
MD		 3513 case lttng_kernel_type_variant:
3514 ret = _lttng_variant_type_statedump(session,
3515 lttng_kernel_get_type_variant(type),
3516 nesting);
ceabb767
MD		 3517 break;
3518
3519 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3520 case lttng_kernel_type_array:
3521 case lttng_kernel_type_sequence:
ceabb767
MD		 3522 default:
3523 WARN_ON_ONCE(1);
3524 return -EINVAL;
8070f5c0 3525 }
ceabb767
MD		 3526 return ret;
3527}
8070f5c0 3528
ceabb767
MD		 3529/*
3530 * Must be called with sessions_mutex held.
3531 */
3532static
3533int _lttng_field_statedump(struct lttng_session *session,
437d5aa5 3534 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3535 size_t nesting)
3536{
3537 int ret = 0;
27d2368e 3538
437d5aa5 3539 switch (field->type->type) {
12bb2edb 3540 case lttng_kernel_type_integer:
ceabb767
MD		 3541 ret = _lttng_integer_field_statedump(session, field, nesting);
3542 break;
437d5aa5 3543 case lttng_kernel_type_enum:
ceabb767 3544 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3545 break;
12bb2edb 3546 case lttng_kernel_type_string:
ceabb767 3547 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3548 break;
437d5aa5 3549 case lttng_kernel_type_struct:
ceabb767 3550 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3551 break;
437d5aa5 3552 case lttng_kernel_type_array:
ceabb767 3553 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3554 break;
437d5aa5 3555 case lttng_kernel_type_sequence:
ceabb767 3556 ret = _lttng_sequence_field_statedump(session, field, nesting);
f513b2bf 3557 break;
437d5aa5 3558 case lttng_kernel_type_variant:
ceabb767 3559 ret = _lttng_variant_field_statedump(session, field, nesting);
65c85aa6 3560 break;
f513b2bf 3561
8070f5c0
MD		 3562 default:
3563 WARN_ON_ONCE(1);
3564 return -EINVAL;
3565 }
3566 return ret;
3567}
3568
3569static
a90917c3 3570int _lttng_context_metadata_statedump(struct lttng_session *session,
437d5aa5 3571 struct lttng_kernel_ctx *ctx)
8070f5c0
MD		 3572{
3573 int ret = 0;
3574 int i;
3575
3576 if (!ctx)
3577 return 0;
3578 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3579 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3580
437d5aa5 3581 ret = _lttng_field_statedump(session, field->event_field, 2);
8070f5c0
MD		 3582 if (ret)
3583 return ret;
3584 }
3585 return ret;
3586}
3587
3588static
a90917c3 3589int _lttng_fields_metadata_statedump(struct lttng_session *session,
a67ba386 3590 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3591{
a67ba386 3592 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3593 int ret = 0;
3594 int i;
3595
3596 for (i = 0; i < desc->nr_fields; i++) {
437d5aa5 3597 const struct lttng_kernel_event_field *field = desc->fields[i];
8070f5c0 3598
f513b2bf 3599 ret = _lttng_field_statedump(session, field, 2);
8070f5c0
MD		 3600 if (ret)
3601 return ret;
c099397a
MD		 3602 }
3603 return ret;
3604}
3605
d83004aa
JD		 3606/*
3607 * Must be called with sessions_mutex held.
8b97fd42
MD		 3608 * The entire event metadata is printed as a single atomic metadata
3609 * transaction.
d83004aa 3610 */
c099397a 3611static
a90917c3
MD		 3612int _lttng_event_metadata_statedump(struct lttng_session *session,
3613 struct lttng_channel *chan,
a67ba386 3614 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3615{
3616 int ret = 0;
3617
a67ba386 3618 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3619 return 0;
d83004aa 3620 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3621 return 0;
3622
8b97fd42
MD		 3623 lttng_metadata_begin(session);
3624
c099397a
MD		 3625 ret = lttng_metadata_printf(session,
3626 "event {\n"
ae734547 3627 " name = \"%s\";\n"
c099397a 3628 " id = %u;\n"
b9074a1b 3629 " stream_id = %u;\n",
a67ba386
MD		 3630 event_recorder->priv->parent.desc->event_name,
3631 event_recorder->priv->id,
3632 event_recorder->chan->id);
c099397a
MD		 3633 if (ret)
3634 goto end;
3635
8070f5c0 3636 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3637 " fields := struct {\n"
3638 );
3639 if (ret)
3640 goto end;
3641
a67ba386 3642 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3643 if (ret)
3644 goto end;
3645
3646 /*
3647 * LTTng space reservation can only reserve multiples of the
3648 * byte size.
3649 */
3650 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3651 " };\n"
3652 "};\n\n");
c099397a
MD		 3653 if (ret)
3654 goto end;
3655
a67ba386 3656 event_recorder->priv->metadata_dumped = 1;
c099397a 3657end:
8b97fd42 3658 lttng_metadata_end(session);
c099397a
MD		 3659 return ret;
3660
3661}
3662
d83004aa
JD		 3663/*
3664 * Must be called with sessions_mutex held.
8b97fd42
MD		 3665 * The entire channel metadata is printed as a single atomic metadata
3666 * transaction.
d83004aa 3667 */
c099397a 3668static
a90917c3
MD		 3669int _lttng_channel_metadata_statedump(struct lttng_session *session,
3670 struct lttng_channel *chan)
c099397a
MD		 3671{
3672 int ret = 0;
3673
585e5dcc 3674 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3675 return 0;
d83004aa
JD		 3676
3677 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3678 return 0;
3679
8b97fd42
MD		 3680 lttng_metadata_begin(session);
3681
c099397a
MD		 3682 WARN_ON_ONCE(!chan->header_type);
3683 ret = lttng_metadata_printf(session,
3684 "stream {\n"
3685 " id = %u;\n"
9115fbdc 3686 " event.header := %s;\n"
b9074a1b 3687 " packet.context := struct packet_context;\n",
c099397a
MD		 3688 chan->id,
3689 chan->header_type == 1 ? "struct event_header_compact" :
3690 "struct event_header_large");
3691 if (ret)
3692 goto end;
3693
b9074a1b
MD		 3694 if (chan->ctx) {
3695 ret = lttng_metadata_printf(session,
3696 " event.context := struct {\n");
3697 if (ret)
3698 goto end;
3699 }
a90917c3 3700 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 3701 if (ret)
3702 goto end;
b9074a1b
MD		 3703 if (chan->ctx) {
3704 ret = lttng_metadata_printf(session,
3705 " };\n");
3706 if (ret)
3707 goto end;
3708 }
8070f5c0
MD		 3709
3710 ret = lttng_metadata_printf(session,
b9074a1b 3711 "};\n\n");
8070f5c0 3712
c099397a
MD		 3713 chan->metadata_dumped = 1;
3714end:
8b97fd42 3715 lttng_metadata_end(session);
c099397a
MD		 3716 return ret;
3717}
3718
d83004aa
JD		 3719/*
3720 * Must be called with sessions_mutex held.
3721 */
9115fbdc 3722static
a90917c3 3723int _lttng_stream_packet_context_declare(struct lttng_session *session)
9115fbdc
MD		 3724{
3725 return lttng_metadata_printf(session,
3726 "struct packet_context {\n"
a3ccff4f
MD		 3727 " uint64_clock_monotonic_t timestamp_begin;\n"
3728 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3729 " uint64_t content_size;\n"
3730 " uint64_t packet_size;\n"
5b3cf4f9 3731 " uint64_t packet_seq_num;\n"
a9afe705 3732 " unsigned long events_discarded;\n"
9115fbdc 3733 " uint32_t cpu_id;\n"
c6dfdf6f 3734 "};\n\n"
9115fbdc
MD		 3735 );
3736}
3737
3738/*
3739 * Compact header:
3740 * id: range: 0 - 30.
3741 * id 31 is reserved to indicate an extended header.
3742 *
3743 * Large header:
3744 * id: range: 0 - 65534.
3745 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3746 *
3747 * Must be called with sessions_mutex held.
9115fbdc
MD		 3748 */
3749static
a90917c3 3750int _lttng_event_header_declare(struct lttng_session *session)
9115fbdc
MD		 3751{
3752 return lttng_metadata_printf(session,
3753 "struct event_header_compact {\n"
3754 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3755 " variant <id> {\n"
3756 " struct {\n"
a3ccff4f 3757 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3758 " } compact;\n"
3759 " struct {\n"
3760 " uint32_t id;\n"
a3ccff4f 3761 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3762 " } extended;\n"
3763 " } v;\n"
3764 "} align(%u);\n"
3765 "\n"
3766 "struct event_header_large {\n"
3767 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3768 " variant <id> {\n"
3769 " struct {\n"
a3ccff4f 3770 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3771 " } compact;\n"
3772 " struct {\n"
3773 " uint32_t id;\n"
a3ccff4f 3774 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3775 " } extended;\n"
3776 " } v;\n"
3777 "} align(%u);\n\n",
a90917c3
MD		 3778 lttng_alignof(uint32_t) * CHAR_BIT,
3779 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3780 );
3781}
3782
a3ccff4f
MD		 3783 /*
3784 * Approximation of NTP time of day to clock monotonic correlation,
3785 * taken at start of trace.
3786 * Yes, this is only an approximation. Yes, we can (and will) do better
3787 * in future versions.
5283350b
MD		 3788 * This function may return a negative offset. It may happen if the
3789 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3790 *
3791 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3792 * y2038 compliant.
a3ccff4f
MD		 3793 */
3794static
8967b2a3 3795int64_t measure_clock_offset(void)
a3ccff4f 3796{
dcb93448 3797 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3798 uint64_t tcf = trace_clock_freq();
dcb93448 3799 int64_t offset;
a3ccff4f 3800 unsigned long flags;
3636085f
MJ		 3801#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3802 struct timespec64 rts = { 0, 0 };
3803#else
3804 struct timespec rts = { 0, 0 };
3805#endif
a3ccff4f
MD		 3806
3807 /* Disable interrupts to increase correlation precision. */
3808 local_irq_save(flags);
3809 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3810#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3811 ktime_get_real_ts64(&rts);
3812#else
216b6baa 3813 getnstimeofday(&rts);
3636085f 3814#endif
a3ccff4f
MD		 3815 monotonic[1] = trace_clock_read64();
3816 local_irq_restore(flags);
3817
dcb93448 3818 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3819 realtime = (uint64_t) rts.tv_sec * tcf;
3820 if (tcf == NSEC_PER_SEC) {
3821 realtime += rts.tv_nsec;
3822 } else {
3823 uint64_t n = rts.tv_nsec * tcf;
3824
3825 do_div(n, NSEC_PER_SEC);
3826 realtime += n;
3827 }
dcb93448 3828 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3829 return offset;
3830}
3831
3eb95be4
JR		 3832static
3833int print_escaped_ctf_string(struct lttng_session *session, const char *string)
3834{
0f3eaad4 3835 int ret = 0;
3eb95be4
JR		 3836 size_t i;
3837 char cur;
3838
3839 i = 0;
3840 cur = string[i];
3841 while (cur != '\0') {
3842 switch (cur) {
3843 case '\n':
3844 ret = lttng_metadata_printf(session, "%s", "\\n");
3845 break;
3846 case '\\':
3847 case '"':
3848 ret = lttng_metadata_printf(session, "%c", '\\');
3849 if (ret)
3850 goto error;
3851 /* We still print the current char */
3852 /* Fallthrough */
3853 default:
3854 ret = lttng_metadata_printf(session, "%c", cur);
3855 break;
3856 }
3857
3858 if (ret)
3859 goto error;
3860
3861 cur = string[++i];
3862 }
3863error:
3864 return ret;
3865}
3866
3867static
1c88f269
JR		 3868int print_metadata_escaped_field(struct lttng_session *session, const char *field,
3869 const char *field_value)
3eb95be4
JR		 3870{
3871 int ret;
3872
1c88f269 3873 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3874 if (ret)
3875 goto error;
3876
1c88f269 3877 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3878 if (ret)
3879 goto error;
3880
3881 ret = lttng_metadata_printf(session, "\";\n");
3882
3883error:
3884 return ret;
3885}
3886
c099397a
MD		 3887/*
3888 * Output metadata into this session's metadata buffers.
d83004aa 3889 * Must be called with sessions_mutex held.
c099397a
MD		 3890 */
3891static
a90917c3 3892int _lttng_session_metadata_statedump(struct lttng_session *session)
c099397a 3893{
30bdb6e4 3894 unsigned char *uuid_c = session->uuid.b;
a82c63f1 3895 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3896 const char *product_uuid;
a90917c3 3897 struct lttng_channel *chan;
a67ba386 3898 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3899 int ret = 0;
3900
585e5dcc 3901 if (!LTTNG_READ_ONCE(session->active))
c099397a 3902 return 0;
8b97fd42
MD		 3903
3904 lttng_metadata_begin(session);
3905
c099397a
MD		 3906 if (session->metadata_dumped)
3907 goto skip_session;
c099397a 3908
d793d5e1 3909 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3910 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3911 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3912 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3913 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3914 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3915
3916 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3917 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3918 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3919 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3920 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3921 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3922 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3923 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3924 "\n"
3925 "trace {\n"
3926 " major = %u;\n"
3927 " minor = %u;\n"
30bdb6e4 3928 " uuid = \"%s\";\n"
d793d5e1
MD		 3929 " byte_order = %s;\n"
3930 " packet.header := struct {\n"
3931 " uint32_t magic;\n"
1ec3f75a 3932 " uint8_t uuid[16];\n"
d793d5e1 3933 " uint32_t stream_id;\n"
5594698f 3934 " uint64_t stream_instance_id;\n"
0eb25f58 3935 " };\n"
d793d5e1 3936 "};\n\n",
a90917c3
MD		 3937 lttng_alignof(uint8_t) * CHAR_BIT,
3938 lttng_alignof(uint16_t) * CHAR_BIT,
3939 lttng_alignof(uint32_t) * CHAR_BIT,
3940 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3941 sizeof(unsigned long) * CHAR_BIT,
3942 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3943 CTF_SPEC_MAJOR,
3944 CTF_SPEC_MINOR,
d793d5e1 3945 uuid_s,
5214fa50 3946#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3947 "be"
3948#else
3949 "le"
3950#endif
3951 );
3952 if (ret)
3953 goto end;
3954
99dc9597
MD		 3955 ret = lttng_metadata_printf(session,
3956 "env {\n"
a6058143 3957 " hostname = \"%s\";\n"
c6c9e10f 3958 " domain = \"kernel\";\n"
99dc9597 3959 " sysname = \"%s\";\n"
c6c9e10f
MD		 3960 " kernel_release = \"%s\";\n"
3961 " kernel_version = \"%s\";\n"
3962 " tracer_name = \"lttng-modules\";\n"
3963 " tracer_major = %d;\n"
3964 " tracer_minor = %d;\n"
3965 " tracer_patchlevel = %d;\n"
3eb95be4 3966 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3967 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3968 utsname()->sysname,
3969 utsname()->release,
c6c9e10f
MD		 3970 utsname()->version,
3971 LTTNG_MODULES_MAJOR_VERSION,
3972 LTTNG_MODULES_MINOR_VERSION,
3973 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3974 );
3975 if (ret)
3976 goto end;
3977
1c88f269
JR		 3978 ret = print_metadata_escaped_field(session, "trace_name", session->name);
3979 if (ret)
3980 goto end;
3981 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
3982 session->creation_time);
3eb95be4
JR		 3983 if (ret)
3984 goto end;
3985
c88f762e
GB		 3986 /* Add the product UUID to the 'env' section */
3987 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3988 if (product_uuid) {
3989 ret = lttng_metadata_printf(session,
3990 " product_uuid = \"%s\";\n",
3991 product_uuid
3992 );
3993 if (ret)
3994 goto end;
3995 }
3996
3997 /* Close the 'env' section */
3eb95be4
JR		 3998 ret = lttng_metadata_printf(session, "};\n\n");
3999 if (ret)
4000 goto end;
4001
a3ccff4f
MD		 4002 ret = lttng_metadata_printf(session,
4003 "clock {\n"
2754583e
MD		 4004 " name = \"%s\";\n",
4005 trace_clock_name()
a82c63f1
MD		 4006 );
4007 if (ret)
4008 goto end;
4009
4010 if (!trace_clock_uuid(clock_uuid_s)) {
4011 ret = lttng_metadata_printf(session,
7c27cb17 4012 " uuid = \"%s\";\n",
a82c63f1
MD		 4013 clock_uuid_s
4014 );
4015 if (ret)
4016 goto end;
4017 }
4018
4019 ret = lttng_metadata_printf(session,
2754583e 4020 " description = \"%s\";\n"
a3ccff4f
MD		 4021 " freq = %llu; /* Frequency, in Hz */\n"
4022 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4023 " offset = %lld;\n"
a3ccff4f 4024 "};\n\n",
2754583e 4025 trace_clock_description(),
a3ccff4f 4026 (unsigned long long) trace_clock_freq(),
8967b2a3 4027 (long long) measure_clock_offset()
a3ccff4f
MD		 4028 );
4029 if (ret)
4030 goto end;
4031
4032 ret = lttng_metadata_printf(session,
4033 "typealias integer {\n"
4034 " size = 27; align = 1; signed = false;\n"
2754583e 4035 " map = clock.%s.value;\n"
a3ccff4f
MD		 4036 "} := uint27_clock_monotonic_t;\n"
4037 "\n"
4038 "typealias integer {\n"
4039 " size = 32; align = %u; signed = false;\n"
2754583e 4040 " map = clock.%s.value;\n"
a3ccff4f
MD		 4041 "} := uint32_clock_monotonic_t;\n"
4042 "\n"
4043 "typealias integer {\n"
4044 " size = 64; align = %u; signed = false;\n"
2754583e 4045 " map = clock.%s.value;\n"
a3ccff4f 4046 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4047 trace_clock_name(),
a3ccff4f 4048 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4049 trace_clock_name(),
4050 lttng_alignof(uint64_t) * CHAR_BIT,
4051 trace_clock_name()
a3ccff4f
MD		 4052 );
4053 if (ret)
4054 goto end;
4055
a90917c3 4056 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4057 if (ret)
4058 goto end;
4059
a90917c3 4060 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4061 if (ret)
4062 goto end;
4063
c099397a
MD		 4064skip_session:
4065 list_for_each_entry(chan, &session->chan, list) {
a90917c3 4066 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 4067 if (ret)
4068 goto end;
4069 }
4070
a67ba386
MD		 4071 list_for_each_entry(event_recorder_priv, &session->events, node) {
4072 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4073 event_recorder_priv->pub);
c099397a
MD		 4074 if (ret)
4075 goto end;
4076 }
4077 session->metadata_dumped = 1;
4078end:
8b97fd42 4079 lttng_metadata_end(session);
c099397a
MD		 4080 return ret;
4081}
4082
c0e31d2e 4083/**
a90917c3 4084 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4085 * @transport: transport structure
4086 *
4087 * Registers a transport which can be used as output to extract the data out of
4088 * LTTng. The module calling this registration function must ensure that no
4089 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4090 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4091 * is made visible to the transport function. This registration acts as a
263b6c88 4092 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4093 * after its registration must it synchronize the TLBs.
4094 */
a90917c3 4095void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4096{
4097 /*
4098 * Make sure no page fault can be triggered by the module about to be
4099 * registered. We deal with this here so we don't have to call
263b6c88 4100 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4101 */
263b6c88 4102 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4103
4104 mutex_lock(&sessions_mutex);
a90917c3 4105 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4106 mutex_unlock(&sessions_mutex);
4107}
a90917c3 4108EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4109
4110/**
a90917c3 4111 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4112 * @transport: transport structure
4113 */
a90917c3 4114void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4115{
4116 mutex_lock(&sessions_mutex);
4117 list_del(&transport->node);
4118 mutex_unlock(&sessions_mutex);
4119}
a90917c3 4120EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4121
a101fa10
MD		 4122void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4123{
4124 /*
4125 * Make sure no page fault can be triggered by the module about to be
4126 * registered. We deal with this here so we don't have to call
4127 * vmalloc_sync_mappings() in each module's init.
4128 */
4129 wrapper_vmalloc_sync_mappings();
4130
4131 mutex_lock(&sessions_mutex);
4132 list_add_tail(&transport->node, &lttng_counter_transport_list);
4133 mutex_unlock(&sessions_mutex);
4134}
4135EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4136
4137void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4138{
4139 mutex_lock(&sessions_mutex);
4140 list_del(&transport->node);
4141 mutex_unlock(&sessions_mutex);
4142}
4143EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4144
5f4c791e 4145#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4146
4147enum cpuhp_state lttng_hp_prepare;
4148enum cpuhp_state lttng_hp_online;
4149
4150static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4151{
4152 struct lttng_cpuhp_node *lttng_node;
4153
4154 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4155 switch (lttng_node->component) {
4156 case LTTNG_RING_BUFFER_FRONTEND:
4157 return 0;
4158 case LTTNG_RING_BUFFER_BACKEND:
4159 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4160 case LTTNG_RING_BUFFER_ITER:
4161 return 0;
4162 case LTTNG_CONTEXT_PERF_COUNTERS:
4163 return 0;
4164 default:
4165 return -EINVAL;
4166 }
4167}
4168
4169static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4170{
4171 struct lttng_cpuhp_node *lttng_node;
4172
4173 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4174 switch (lttng_node->component) {
4175 case LTTNG_RING_BUFFER_FRONTEND:
4176 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4177 case LTTNG_RING_BUFFER_BACKEND:
4178 return 0;
4179 case LTTNG_RING_BUFFER_ITER:
4180 return 0;
4181 case LTTNG_CONTEXT_PERF_COUNTERS:
4182 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4183 default:
4184 return -EINVAL;
4185 }
4186}
4187
4188static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4189{
4190 struct lttng_cpuhp_node *lttng_node;
4191
4192 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4193 switch (lttng_node->component) {
4194 case LTTNG_RING_BUFFER_FRONTEND:
4195 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4196 case LTTNG_RING_BUFFER_BACKEND:
4197 return 0;
4198 case LTTNG_RING_BUFFER_ITER:
4199 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4200 case LTTNG_CONTEXT_PERF_COUNTERS:
4201 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4202 default:
4203 return -EINVAL;
4204 }
4205}
4206
4207static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4208{
4209 struct lttng_cpuhp_node *lttng_node;
4210
4211 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4212 switch (lttng_node->component) {
4213 case LTTNG_RING_BUFFER_FRONTEND:
4214 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4215 case LTTNG_RING_BUFFER_BACKEND:
4216 return 0;
4217 case LTTNG_RING_BUFFER_ITER:
4218 return 0;
4219 case LTTNG_CONTEXT_PERF_COUNTERS:
4220 return 0;
4221 default:
4222 return -EINVAL;
4223 }
4224}
4225
4226static int __init lttng_init_cpu_hotplug(void)
4227{
4228 int ret;
4229
4230 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4231 lttng_hotplug_prepare,
4232 lttng_hotplug_dead);
4233 if (ret < 0) {
4234 return ret;
4235 }
4236 lttng_hp_prepare = ret;
4237 lttng_rb_set_hp_prepare(ret);
4238
4239 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4240 lttng_hotplug_online,
4241 lttng_hotplug_offline);
4242 if (ret < 0) {
4243 cpuhp_remove_multi_state(lttng_hp_prepare);
4244 lttng_hp_prepare = 0;
4245 return ret;
4246 }
4247 lttng_hp_online = ret;
4248 lttng_rb_set_hp_online(ret);
4249
4250 return 0;
4251}
4252
4253static void __exit lttng_exit_cpu_hotplug(void)
4254{
4255 lttng_rb_set_hp_online(0);
4256 cpuhp_remove_multi_state(lttng_hp_online);
4257 lttng_rb_set_hp_prepare(0);
4258 cpuhp_remove_multi_state(lttng_hp_prepare);
4259}
4260
5f4c791e 4261#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4262static int lttng_init_cpu_hotplug(void)
4263{
4264 return 0;
4265}
4266static void lttng_exit_cpu_hotplug(void)
4267{
4268}
5f4c791e 4269#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4270
4271
a90917c3 4272static int __init lttng_events_init(void)
4e3c1b9b 4273{
1c25284c
MD		 4274 int ret;
4275
453b2495
JD		 4276 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4277 if (ret)
4278 return ret;
389d7070 4279 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4280 if (ret)
4281 return ret;
4282 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4283 if (ret)
4284 return ret;
4285 ret = lttng_probes_init();
389d7070
MD		 4286 if (ret)
4287 return ret;
07dfc1d0 4288 ret = lttng_context_init();
20591cf7
MD		 4289 if (ret)
4290 return ret;
07dfc1d0
MD		 4291 ret = lttng_tracepoint_init();
4292 if (ret)
4293 goto error_tp;
a67ba386
MD		 4294 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4295 if (!event_recorder_cache) {
20591cf7 4296 ret = -ENOMEM;
a67ba386 4297 goto error_kmem_event_recorder;
dffef45d 4298 }
a67ba386
MD		 4299 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4300 if (!event_recorder_private_cache) {
4301 ret = -ENOMEM;
4302 goto error_kmem_event_recorder_private;
4303 }
4304 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4305 if (!event_notifier_cache) {
4306 ret = -ENOMEM;
4307 goto error_kmem_event_notifier;
20591cf7 4308 }
a67ba386
MD		 4309 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4310 if (!event_notifier_private_cache) {
4311 ret = -ENOMEM;
4312 goto error_kmem_event_notifier_private;
4313 }
80996790 4314 ret = lttng_abi_init();
02119ee5
MD		 4315 if (ret)
4316 goto error_abi;
0c956676
MD		 4317 ret = lttng_logger_init();
4318 if (ret)
4319 goto error_logger;
1e367326
MD		 4320 ret = lttng_init_cpu_hotplug();
4321 if (ret)
4322 goto error_hotplug;
101215b7 4323 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4324 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4325 __stringify(LTTNG_MODULES_MINOR_VERSION),
4326 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4327 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4328 LTTNG_VERSION_NAME,
4329#ifdef LTTNG_EXTRA_VERSION_GIT
4330 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4331#else
4332 "",
4333#endif
4334#ifdef LTTNG_EXTRA_VERSION_NAME
4335 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4336#else
4337 "");
4338#endif
4e3c1b9b 4339 return 0;
0c956676 4340
1e367326
MD		 4341error_hotplug:
4342 lttng_logger_exit();
0c956676
MD		 4343error_logger:
4344 lttng_abi_exit();
02119ee5 4345error_abi:
a67ba386
MD		 4346 kmem_cache_destroy(event_notifier_private_cache);
4347error_kmem_event_notifier_private:
dffef45d
FD		 4348 kmem_cache_destroy(event_notifier_cache);
4349error_kmem_event_notifier:
a67ba386
MD		 4350 kmem_cache_destroy(event_recorder_private_cache);
4351error_kmem_event_recorder_private:
4352 kmem_cache_destroy(event_recorder_cache);
4353error_kmem_event_recorder:
20591cf7 4354 lttng_tracepoint_exit();
07dfc1d0
MD		 4355error_tp:
4356 lttng_context_exit();
101215b7 4357 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4358 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4359 __stringify(LTTNG_MODULES_MINOR_VERSION),
4360 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4361 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4362 LTTNG_VERSION_NAME,
4363#ifdef LTTNG_EXTRA_VERSION_GIT
4364 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4365#else
4366 "",
4367#endif
4368#ifdef LTTNG_EXTRA_VERSION_NAME
4369 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4370#else
4371 "");
4372#endif
1c25284c 4373 return ret;
4e3c1b9b
MD		 4374}
4375
a90917c3 4376module_init(lttng_events_init);
11b5a3c2 4377
a90917c3 4378static void __exit lttng_events_exit(void)
4e3c1b9b 4379{
a90917c3 4380 struct lttng_session *session, *tmpsession;
92e94819 4381
1e367326 4382 lttng_exit_cpu_hotplug();
0c956676 4383 lttng_logger_exit();
80996790 4384 lttng_abi_exit();
92e94819 4385 list_for_each_entry_safe(session, tmpsession, &sessions, list)
a90917c3 4386 lttng_session_destroy(session);
a67ba386
MD		 4387 kmem_cache_destroy(event_recorder_cache);
4388 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4389 kmem_cache_destroy(event_notifier_cache);
a67ba386 4390 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4391 lttng_tracepoint_exit();
07dfc1d0 4392 lttng_context_exit();
101215b7 4393 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4394 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4395 __stringify(LTTNG_MODULES_MINOR_VERSION),
4396 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4397 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4398 LTTNG_VERSION_NAME,
4399#ifdef LTTNG_EXTRA_VERSION_GIT
4400 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4401#else
4402 "",
4403#endif
4404#ifdef LTTNG_EXTRA_VERSION_NAME
4405 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4406#else
4407 "");
4408#endif
4e3c1b9b 4409}
92e94819 4410
a90917c3 4411module_exit(lttng_events_exit);
11b5a3c2 4412
7ca11e77 4413#include <generated/patches.h>
101215b7
MJ		 4414#ifdef LTTNG_EXTRA_VERSION_GIT
4415MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4416#endif
4417#ifdef LTTNG_EXTRA_VERSION_NAME
4418MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4419#endif
92e94819
MD		 4420MODULE_LICENSE("GPL and additional rights");
4421MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4422MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4423MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4424 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4425 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4426 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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