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Rename struct lib_ring_buffer_ctx to struct lttng_kernel_ring_buffer_ctx
[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,
51ef4536 92 size_t nesting, const char **prev_field_name_p);
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;
4a399b76 294 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 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
4a399b76 425 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 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
9d993668 606int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 607{
3c997079 608 int ret = 0;
e64957da 609
3c997079 610 mutex_lock(&sessions_mutex);
9d993668
MD		 611 switch (event->type) {
612 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
613 {
614 struct lttng_kernel_event_recorder *event_recorder =
615 container_of(event, struct lttng_kernel_event_recorder, parent);
616
617 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
618 ret = -EPERM;
619 goto end;
620 }
a0493bef 621 break;
9d993668
MD		 622 }
623 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
624 switch (event->priv->instrumentation) {
625 case LTTNG_KERNEL_ABI_KRETPROBE:
626 ret = -EINVAL;
627 goto end;
628 default:
629 break;
630 }
a0493bef
MD		 631 break;
632 default:
9d993668 633 break;
a0493bef 634 }
e64957da 635
9d993668 636 if (event->enabled) {
3c997079
MD		 637 ret = -EEXIST;
638 goto end;
639 }
a67ba386 640 switch (event->priv->instrumentation) {
606828e4
MD		 641 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
642 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 643 ret = -EINVAL;
644 break;
b4a75708 645
606828e4
MD		 646 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
647 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 648 WRITE_ONCE(event->enabled, 1);
a0493bef 649 break;
b4a75708 650
606828e4 651 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 652 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 653 break;
b4a75708 654
606828e4
MD		 655 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
656 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 657 default:
658 WARN_ON_ONCE(1);
659 ret = -EINVAL;
660 }
3c997079
MD		 661end:
662 mutex_unlock(&sessions_mutex);
663 return ret;
e64957da
MD		 664}
665
9d993668 666int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 667{
668 int ret = 0;
669
670 mutex_lock(&sessions_mutex);
9d993668
MD		 671 switch (event->type) {
672 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
673 {
674 struct lttng_kernel_event_recorder *event_recorder =
675 container_of(event, struct lttng_kernel_event_recorder, parent);
676
677 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
678 ret = -EPERM;
679 goto end;
680 }
b01155ba 681 break;
9d993668
MD		 682 }
683 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
684 switch (event->priv->instrumentation) {
685 case LTTNG_KERNEL_ABI_KRETPROBE:
686 ret = -EINVAL;
687 goto end;
688 default:
689 break;
690 }
2b16f0c9 691 break;
dffef45d 692 default:
9d993668 693 break;
dffef45d 694 }
dffef45d 695
a67ba386 696 if (!event->enabled) {
dffef45d
FD		 697 ret = -EEXIST;
698 goto end;
699 }
a67ba386 700 switch (event->priv->instrumentation) {
606828e4
MD		 701 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
702 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 703 ret = -EINVAL;
704 break;
b4a75708 705
606828e4
MD		 706 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
707 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 708 WRITE_ONCE(event->enabled, 0);
2b16f0c9 709 break;
b4a75708 710
9d993668
MD		 711 case LTTNG_KERNEL_ABI_KRETPROBE:
712 ret = lttng_kretprobes_event_enable_state(event, 0);
713 break;
714
606828e4 715 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
606828e4 716 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 717 default:
718 WARN_ON_ONCE(1);
719 ret = -EINVAL;
720 }
721end:
722 mutex_unlock(&sessions_mutex);
723 return ret;
724}
725
a90917c3 726struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 727 const char *transport_name,
728 void *buf_addr,
4e3c1b9b
MD		 729 size_t subbuf_size, size_t num_subbuf,
730 unsigned int switch_timer_interval,
d83004aa
JD		 731 unsigned int read_timer_interval,
732 enum channel_type channel_type)
4e3c1b9b 733{
a90917c3
MD		 734 struct lttng_channel *chan;
735 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 736
737 mutex_lock(&sessions_mutex);
d83004aa 738 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 739 goto active; /* Refuse to add channel to active session */
a90917c3 740 transport = lttng_transport_find(transport_name);
f3d01b96 741 if (!transport) {
5a15f70c 742 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 743 transport_name);
c0e31d2e 744 goto notransport;
f3d01b96 745 }
a33c9927 746 if (!try_module_get(transport->owner)) {
5a15f70c 747 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 748 goto notransport;
749 }
a90917c3 750 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 751 if (!chan)
c0e31d2e 752 goto nomem;
4e3c1b9b 753 chan->session = session;
05d32c64 754 chan->id = session->free_chan_id++;
3b731ab1 755 chan->ops = &transport->ops;
125b4df4
MD		 756 /*
757 * Note: the channel creation op already writes into the packet
758 * headers. Therefore the "chan" information used as input
759 * should be already accessible.
760 */
4a399b76 761 chan->chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 762 chan, buf_addr, subbuf_size, num_subbuf,
763 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 764 if (!chan->chan)
765 goto create_error;
3c997079 766 chan->tstate = 1;
e64957da 767 chan->enabled = 1;
a33c9927 768 chan->transport = transport;
d83004aa 769 chan->channel_type = channel_type;
4e3c1b9b
MD		 770 list_add(&chan->list, &session->chan);
771 mutex_unlock(&sessions_mutex);
772 return chan;
773
f3d01b96
MD		 774create_error:
775 kfree(chan);
c0e31d2e 776nomem:
a33c9927
MD		 777 if (transport)
778 module_put(transport->owner);
c0e31d2e 779notransport:
e5382b6d 780active:
4e3c1b9b
MD		 781 mutex_unlock(&sessions_mutex);
782 return NULL;
783}
784
785/*
d83004aa
JD		 786 * Only used internally at session destruction for per-cpu channels, and
787 * when metadata channel is released.
788 * Needs to be called with sessions mutex held.
4e3c1b9b 789 */
aa7c23a9 790static
a90917c3 791void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 792{
4a399b76 793 chan->ops->priv->channel_destroy(chan->chan);
a33c9927 794 module_put(chan->transport->owner);
4e3c1b9b 795 list_del(&chan->list);
437d5aa5 796 lttng_kernel_destroy_context(chan->ctx);
4e3c1b9b
MD		 797 kfree(chan);
798}
799
d83004aa
JD		 800void lttng_metadata_channel_destroy(struct lttng_channel *chan)
801{
802 BUG_ON(chan->channel_type != METADATA_CHANNEL);
803
804 /* Protect the metadata cache with the sessions_mutex. */
805 mutex_lock(&sessions_mutex);
806 _lttng_channel_destroy(chan);
807 mutex_unlock(&sessions_mutex);
808}
809EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
810
811static
812void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
813{
814 stream->finalized = 1;
815 wake_up_interruptible(&stream->read_wait);
816}
817
a101fa10 818
e5382b6d
MD		 819/*
820 * Supports event creation while tracing session is active.
3c997079 821 * Needs to be called with sessions mutex held.
e5382b6d 822 */
a67ba386 823struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 824 struct lttng_kernel_abi_event *event_param,
437d5aa5 825 const struct lttng_kernel_event_desc *event_desc,
606828e4 826 enum lttng_kernel_abi_instrumentation itype)
4e3c1b9b 827{
3c997079 828 struct lttng_session *session = chan->session;
a67ba386
MD		 829 struct lttng_kernel_event_recorder *event_recorder;
830 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 831 const char *event_name;
832 struct hlist_head *head;
3d084699 833 int ret;
4e3c1b9b 834
abc0446a 835 if (chan->free_event_id == -1U) {
4cf0bf51 836 ret = -EMFILE;
e5382b6d 837 goto full;
abc0446a 838 }
3c997079
MD		 839
840 switch (itype) {
606828e4 841 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 842 event_name = event_desc->event_name;
3c997079 843 break;
b4a75708 844
606828e4
MD		 845 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
846 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
847 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
848 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 849 event_name = event_param->name;
850 break;
b4a75708 851
606828e4
MD		 852 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
853 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
3c997079
MD		 854 default:
855 WARN_ON_ONCE(1);
856 ret = -EINVAL;
857 goto type_error;
858 }
4a11ef1c
FD		 859
860 head = utils_borrow_hash_table_bucket(session->events_ht.table,
861 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 862 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
863 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
864 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 865 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 866 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 867 ret = -EEXIST;
868 goto exist;
abc0446a
MD		 869 }
870 }
3c997079 871
a67ba386
MD		 872 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
873 if (!event_recorder) {
4cf0bf51 874 ret = -ENOMEM;
4e3c1b9b 875 goto cache_error;
abc0446a 876 }
a67ba386
MD		 877 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
878 if (!event_recorder_priv) {
879 ret = -ENOMEM;
880 goto cache_private_error;
881 }
882 event_recorder_priv->pub = event_recorder;
883 event_recorder_priv->parent.pub = &event_recorder->parent;
884 event_recorder->priv = event_recorder_priv;
885 event_recorder->parent.priv = &event_recorder_priv->parent;
886 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
887
8a445457 888 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386
MD		 889 event_recorder->chan = chan;
890 event_recorder->priv->id = chan->free_event_id++;
891 event_recorder->priv->parent.instrumentation = itype;
892 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
893 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 894
895 switch (itype) {
606828e4 896 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 897 /* Event will be enabled by enabler sync. */
a67ba386
MD		 898 event_recorder->parent.enabled = 0;
899 event_recorder->priv->parent.registered = 0;
900 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
901 if (!event_recorder->priv->parent.desc) {
4cf0bf51 902 ret = -ENOENT;
d3dbe23c 903 goto register_error;
abc0446a 904 }
3c997079
MD		 905 /* Populate lttng_event structure before event registration. */
906 smp_wmb();
baf20995 907 break;
b4a75708 908
606828e4 909 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 910 /*
911 * Needs to be explicitly enabled after creation, since
912 * we may want to apply filters.
913 */
a67ba386
MD		 914 event_recorder->parent.enabled = 0;
915 event_recorder->priv->parent.registered = 1;
3c997079
MD		 916 /*
917 * Populate lttng_event structure before event
918 * registration.
919 */
920 smp_wmb();
8bf17deb 921 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 922 event_param->u.kprobe.symbol_name,
923 event_param->u.kprobe.offset,
924 event_param->u.kprobe.addr,
a67ba386 925 event_recorder);
abc0446a 926 if (ret) {
4cf0bf51 927 ret = -EINVAL;
d6d808f3 928 goto register_error;
abc0446a 929 }
a67ba386 930 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 931 WARN_ON_ONCE(!ret);
d6d808f3 932 break;
b4a75708 933
606828e4 934 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 935 {
a67ba386
MD		 936 struct lttng_kernel_event_recorder *event_recorder_return;
937 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 938
939 /* kretprobe defines 2 events */
a0493bef
MD		 940 /*
941 * Needs to be explicitly enabled after creation, since
942 * we may want to apply filters.
943 */
a67ba386
MD		 944 event_recorder->parent.enabled = 0;
945 event_recorder->priv->parent.registered = 1;
946
947 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
948 if (!event_recorder_return) {
949 ret = -ENOMEM;
950 goto register_error;
951 }
952 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
953 if (!event_recorder_return_priv) {
954 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 955 ret = -ENOMEM;
7371f44c 956 goto register_error;
abc0446a 957 }
a67ba386
MD		 958 event_recorder_return_priv->pub = event_recorder_return;
959 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
960 event_recorder_return->priv = event_recorder_return_priv;
961 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
962 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
963
8a445457 964 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386
MD		 965 event_recorder_return->chan = chan;
966 event_recorder_return->priv->id = chan->free_event_id++;
967 event_recorder_return->priv->parent.instrumentation = itype;
968 event_recorder_return->parent.enabled = 0;
969 event_recorder_return->priv->parent.registered = 1;
970 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
971 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 972 /*
a90917c3 973 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 974 */
975 smp_wmb();
3c997079 976 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 977 event_param->u.kretprobe.symbol_name,
978 event_param->u.kretprobe.offset,
979 event_param->u.kretprobe.addr,
a67ba386 980 event_recorder, event_recorder_return);
7371f44c 981 if (ret) {
a67ba386
MD		 982 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
983 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 984 ret = -EINVAL;
7371f44c
MD		 985 goto register_error;
986 }
987 /* Take 2 refs on the module: one per event. */
a67ba386 988 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 989 WARN_ON_ONCE(!ret);
a67ba386 990 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 991 WARN_ON_ONCE(!ret);
a90917c3 992 ret = _lttng_event_metadata_statedump(chan->session, chan,
a67ba386 993 event_recorder_return);
abc0446a 994 WARN_ON_ONCE(ret > 0);
7371f44c 995 if (ret) {
a67ba386
MD		 996 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
997 kmem_cache_free(event_recorder_cache, event_recorder_return);
998 module_put(event_recorder_return->priv->parent.desc->owner);
999 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1000 goto statedump_error;
1001 }
a67ba386 1002 list_add(&event_recorder_return->priv->node, &chan->session->events);
7371f44c
MD		 1003 break;
1004 }
b4a75708 1005
606828e4 1006 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1007 /*
1008 * Needs to be explicitly enabled after creation, since
1009 * we may want to apply filters.
1010 */
a67ba386
MD		 1011 event_recorder->parent.enabled = 0;
1012 event_recorder->priv->parent.registered = 0;
1013 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1014 switch (event_param->u.syscall.entryexit) {
606828e4 1015 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1016 ret = -EINVAL;
1017 goto register_error;
606828e4 1018 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1019 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1020 break;
606828e4 1021 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1022 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1023 break;
1024 }
1025 switch (event_param->u.syscall.abi) {
606828e4 1026 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1027 ret = -EINVAL;
1028 goto register_error;
606828e4 1029 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1030 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1031 break;
606828e4 1032 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1033 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1034 break;
1035 }
a67ba386 1036 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1037 ret = -EINVAL;
259b6cb3 1038 goto register_error;
abc0446a 1039 }
1ec65de1 1040 break;
b4a75708 1041
606828e4 1042 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1043 /*
1044 * Needs to be explicitly enabled after creation, since
1045 * we may want to apply filters.
1046 */
a67ba386
MD		 1047 event_recorder->parent.enabled = 0;
1048 event_recorder->priv->parent.registered = 1;
3aed4dca 1049
a344f64b
FD		 1050 /*
1051 * Populate lttng_event structure before event
1052 * registration.
1053 */
1054 smp_wmb();
149b9a9d 1055
83b802dc 1056 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1057 event_param->u.uprobe.fd,
a67ba386 1058 event_recorder);
149b9a9d
YB		 1059 if (ret)
1060 goto register_error;
a67ba386 1061 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1062 WARN_ON_ONCE(!ret);
1063 break;
b4a75708 1064
606828e4
MD		 1065 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1066 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
baf20995
MD		 1067 default:
1068 WARN_ON_ONCE(1);
4cf0bf51 1069 ret = -EINVAL;
df07930b 1070 goto register_error;
baf20995 1071 }
a67ba386 1072 ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder);
abc0446a
MD		 1073 WARN_ON_ONCE(ret > 0);
1074 if (ret) {
c099397a 1075 goto statedump_error;
abc0446a 1076 }
a67ba386
MD		 1077 hlist_add_head(&event_recorder->priv->hlist, head);
1078 list_add(&event_recorder->priv->node, &chan->session->events);
1079 return event_recorder;
4e3c1b9b 1080
c099397a 1081statedump_error:
259b6cb3 1082 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1083register_error:
a67ba386
MD		 1084 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1085cache_private_error:
1086 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1087cache_error:
1088exist:
3c997079 1089type_error:
e5382b6d 1090full:
4cf0bf51 1091 return ERR_PTR(ret);
4e3c1b9b
MD		 1092}
1093
a67ba386 1094struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1095 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1096 uint64_t token, uint64_t error_counter_index,
1097 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1098 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1099 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1100{
a67ba386
MD		 1101 struct lttng_kernel_event_notifier *event_notifier;
1102 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1103 struct lttng_counter *error_counter;
dffef45d
FD		 1104 const char *event_name;
1105 struct hlist_head *head;
1106 int ret;
1107
1108 switch (itype) {
606828e4 1109 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1110 event_name = event_desc->event_name;
b01155ba 1111 break;
b4a75708 1112
606828e4
MD		 1113 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1114 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1115 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1116 event_name = event_notifier_param->event.name;
1117 break;
b4a75708 1118
606828e4
MD		 1119 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1120 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1121 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1122 default:
1123 WARN_ON_ONCE(1);
1124 ret = -EINVAL;
1125 goto type_error;
1126 }
1127
1128 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1129 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1130 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1131 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1132 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1133 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1134 && event_notifier_group == event_notifier_priv->group
1135 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1136 ret = -EEXIST;
1137 goto exist;
1138 }
1139 }
1140
1141 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1142 if (!event_notifier) {
1143 ret = -ENOMEM;
1144 goto cache_error;
1145 }
a67ba386
MD		 1146 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1147 if (!event_notifier_priv) {
1148 ret = -ENOMEM;
1149 goto cache_private_error;
1150 }
1151 event_notifier_priv->pub = event_notifier;
1152 event_notifier_priv->parent.pub = &event_notifier->parent;
1153 event_notifier->priv = event_notifier_priv;
1154 event_notifier->parent.priv = &event_notifier_priv->parent;
1155 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1156
1157 event_notifier->priv->group = event_notifier_group;
1158 event_notifier->priv->parent.user_token = token;
1159 event_notifier->priv->error_counter_index = error_counter_index;
1160 event_notifier->priv->num_captures = 0;
1161 event_notifier->priv->parent.instrumentation = itype;
1162 event_notifier->notification_send = lttng_event_notifier_notification_send;
1163 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1164 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1165 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1166 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1167
1168 switch (itype) {
606828e4 1169 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1170 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1171 event_notifier->parent.enabled = 0;
1172 event_notifier->priv->parent.registered = 0;
1173 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1174 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1175 ret = -ENOENT;
1176 goto register_error;
1177 }
1178 /* Populate lttng_event_notifier structure before event registration. */
1179 smp_wmb();
1180 break;
b4a75708 1181
606828e4 1182 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1183 /*
1184 * Needs to be explicitly enabled after creation, since
1185 * we may want to apply filters.
1186 */
a67ba386
MD		 1187 event_notifier->parent.enabled = 0;
1188 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1189 /*
1190 * Populate lttng_event_notifier structure before event
1191 * registration.
1192 */
1193 smp_wmb();
1194 ret = lttng_kprobes_register_event_notifier(
1195 event_notifier_param->event.u.kprobe.symbol_name,
1196 event_notifier_param->event.u.kprobe.offset,
1197 event_notifier_param->event.u.kprobe.addr,
1198 event_notifier);
1199 if (ret) {
1200 ret = -EINVAL;
1201 goto register_error;
1202 }
a67ba386 1203 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1204 WARN_ON_ONCE(!ret);
1205 break;
b4a75708 1206
606828e4 1207 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1208 /*
1209 * Needs to be explicitly enabled after creation, since
1210 * we may want to apply filters.
1211 */
a67ba386
MD		 1212 event_notifier->parent.enabled = 0;
1213 event_notifier->priv->parent.registered = 0;
1214 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1215 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1216 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1217 ret = -EINVAL;
1218 goto register_error;
606828e4 1219 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1220 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1221 break;
606828e4 1222 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1223 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1224 break;
1225 }
1226 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1227 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1228 ret = -EINVAL;
1229 goto register_error;
606828e4 1230 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1231 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1232 break;
606828e4 1233 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1234 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1235 break;
1236 }
1237
a67ba386 1238 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1239 ret = -EINVAL;
1240 goto register_error;
1241 }
1242 break;
b4a75708 1243
606828e4 1244 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1245 /*
1246 * Needs to be explicitly enabled after creation, since
1247 * we may want to apply filters.
1248 */
a67ba386
MD		 1249 event_notifier->parent.enabled = 0;
1250 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1251
1252 /*
1253 * Populate lttng_event_notifier structure before
1254 * event_notifier registration.
1255 */
1256 smp_wmb();
1257
1258 ret = lttng_uprobes_register_event_notifier(
1259 event_notifier_param->event.name,
1260 event_notifier_param->event.u.uprobe.fd,
1261 event_notifier);
1262 if (ret)
1263 goto register_error;
a67ba386 1264 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1265 WARN_ON_ONCE(!ret);
1266 break;
b4a75708 1267
606828e4
MD		 1268 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1269 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1270 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1271 default:
1272 WARN_ON_ONCE(1);
1273 ret = -EINVAL;
1274 goto register_error;
1275 }
1276
a67ba386
MD		 1277 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1278 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1279
1280 /*
1281 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1282 * bucket is currently in use. We trust it. The session lock
1283 * synchronizes against concurrent creation of the error
1284 * counter.
99f52fcc 1285 */
ab04d7b1
MD		 1286 error_counter = event_notifier_group->error_counter;
1287 if (error_counter) {
99f52fcc
FD		 1288 size_t dimension_index[1];
1289
1290 /*
1291 * Check that the index is within the boundary of the counter.
1292 */
a67ba386 1293 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1294 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1295 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1296 ret = -EINVAL;
1297 goto register_error;
1298 }
1299
a67ba386 1300 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1301 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1302 if (ret) {
1303 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1304 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1305 goto register_error;
1306 }
1307 }
1308
dffef45d
FD		 1309 return event_notifier;
1310
1311register_error:
a67ba386
MD		 1312 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1313cache_private_error:
dffef45d
FD		 1314 kmem_cache_free(event_notifier_cache, event_notifier);
1315cache_error:
1316exist:
1317type_error:
1318 return ERR_PTR(ret);
1319}
1320
99f52fcc
FD		 1321int lttng_kernel_counter_read(struct lttng_counter *counter,
1322 const size_t *dim_indexes, int32_t cpu,
1323 int64_t *val, bool *overflow, bool *underflow)
1324{
1325 return counter->ops->counter_read(counter->counter, dim_indexes,
1326 cpu, val, overflow, underflow);
1327}
1328
1329int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1330 const size_t *dim_indexes, int64_t *val,
1331 bool *overflow, bool *underflow)
1332{
1333 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1334 val, overflow, underflow);
1335}
1336
1337int lttng_kernel_counter_clear(struct lttng_counter *counter,
1338 const size_t *dim_indexes)
1339{
1340 return counter->ops->counter_clear(counter->counter, dim_indexes);
1341}
1342
a67ba386 1343struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 1344 struct lttng_kernel_abi_event *event_param,
437d5aa5 1345 const struct lttng_kernel_event_desc *event_desc,
606828e4 1346 enum lttng_kernel_abi_instrumentation itype)
3c997079 1347{
a67ba386 1348 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1349
1350 mutex_lock(&sessions_mutex);
a67ba386 1351 event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype);
3c997079
MD		 1352 mutex_unlock(&sessions_mutex);
1353 return event;
1354}
1355
a67ba386 1356struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1357 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1358 uint64_t id, uint64_t error_counter_index,
1359 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1360 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1361 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1362{
a67ba386 1363 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1364
1365 mutex_lock(&sessions_mutex);
1366 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1367 error_counter_index, event_notifier_group,
a67ba386 1368 event_notifier_param, itype);
dffef45d
FD		 1369 mutex_unlock(&sessions_mutex);
1370 return event_notifier;
1371}
1372
3c997079
MD		 1373/* Only used for tracepoints for now. */
1374static
a67ba386 1375void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1376{
437d5aa5 1377 const struct lttng_kernel_event_desc *desc;
f127e61e 1378 int ret = -EINVAL;
3c997079 1379
a67ba386 1380 if (event_recorder->priv->parent.registered)
3c997079 1381 return;
4ecb5ad5 1382
a67ba386
MD		 1383 desc = event_recorder->priv->parent.desc;
1384 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1385 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1386 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
4ecb5ad5 1387 desc->probe_callback,
a67ba386 1388 event_recorder);
4ecb5ad5 1389 break;
b4a75708 1390
606828e4 1391 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1392 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1393 break;
b4a75708 1394
606828e4
MD		 1395 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1396 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1397 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1398 ret = 0;
1399 break;
b4a75708 1400
606828e4
MD		 1401 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1402 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
4ecb5ad5
MD		 1403 default:
1404 WARN_ON_ONCE(1);
1405 }
3c997079 1406 if (!ret)
a67ba386 1407 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1408}
1409
4e3c1b9b
MD		 1410/*
1411 * Only used internally at session destruction.
1412 */
a67ba386 1413int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1414{
a67ba386 1415 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1416 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1417 int ret = -EINVAL;
1418
a67ba386 1419 if (!event_priv->registered)
3c997079
MD		 1420 return 0;
1421
a67ba386
MD		 1422 desc = event_priv->desc;
1423 switch (event_priv->instrumentation) {
606828e4 1424 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386
MD		 1425 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
1426 event_priv->desc->probe_callback,
1427 event_recorder);
baf20995 1428 break;
b4a75708 1429
606828e4 1430 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1431 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1432 ret = 0;
1433 break;
b4a75708 1434
606828e4 1435 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1436 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1437 ret = 0;
1438 break;
b4a75708 1439
606828e4 1440 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1441 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1442 break;
b4a75708 1443
606828e4 1444 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1445 ret = 0;
1446 break;
b4a75708 1447
606828e4 1448 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1449 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1450 ret = 0;
1451 break;
b4a75708 1452
606828e4 1453 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
baf20995
MD		 1454 default:
1455 WARN_ON_ONCE(1);
1456 }
3c997079 1457 if (!ret)
a67ba386 1458 event_priv->registered = 0;
dda6a249
MD		 1459 return ret;
1460}
1461
dffef45d
FD		 1462/* Only used for tracepoints for now. */
1463static
a67ba386 1464void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1465{
437d5aa5 1466 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1467 int ret = -EINVAL;
1468
a67ba386 1469 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1470 return;
1471
a67ba386
MD		 1472 desc = event_notifier->priv->parent.desc;
1473 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1474 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1475 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
e2d5dbc7 1476 desc->probe_callback,
b01155ba
FD		 1477 event_notifier);
1478 break;
b4a75708 1479
606828e4 1480 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1481 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1482 break;
b4a75708 1483
606828e4
MD		 1484 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1485 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1486 ret = 0;
1487 break;
b4a75708 1488
606828e4
MD		 1489 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1490 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1491 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1492 default:
1493 WARN_ON_ONCE(1);
1494 }
1495 if (!ret)
a67ba386 1496 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1497}
1498
1499static
1500int _lttng_event_notifier_unregister(
a67ba386 1501 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1502{
437d5aa5 1503 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1504 int ret = -EINVAL;
1505
a67ba386 1506 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1507 return 0;
1508
a67ba386
MD		 1509 desc = event_notifier->priv->parent.desc;
1510 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1511 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1512 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
e2d5dbc7 1513 event_notifier->priv->parent.desc->probe_callback,
b01155ba
FD		 1514 event_notifier);
1515 break;
b4a75708 1516
606828e4 1517 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1518 lttng_kprobes_unregister_event_notifier(event_notifier);
1519 ret = 0;
1520 break;
b4a75708 1521
606828e4 1522 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1523 lttng_uprobes_unregister_event_notifier(event_notifier);
1524 ret = 0;
1525 break;
b4a75708 1526
606828e4 1527 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1528 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1529 break;
b4a75708 1530
606828e4
MD		 1531 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1532 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1533 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1534 default:
1535 WARN_ON_ONCE(1);
1536 }
1537 if (!ret)
a67ba386 1538 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1539 return ret;
1540}
1541
dda6a249
MD		 1542/*
1543 * Only used internally at session destruction.
1544 */
be066e6c 1545static
0648898e 1546void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1547{
0648898e 1548 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1549 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1550
0648898e
MD		 1551 lttng_free_event_filter_runtime(event);
1552 /* Free event enabler refs */
1553 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1554 &event_priv->enablers_ref_head, node)
1555 kfree(enabler_ref);
b4a75708 1556
0648898e
MD		 1557 switch (event->type) {
1558 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1559 {
1560 struct lttng_kernel_event_recorder *event_recorder =
1561 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1562
0648898e
MD		 1563 switch (event_priv->instrumentation) {
1564 case LTTNG_KERNEL_ABI_TRACEPOINT:
1565 lttng_event_desc_put(event_priv->desc);
1566 break;
b4a75708 1567
0648898e
MD		 1568 case LTTNG_KERNEL_ABI_KPROBE:
1569 module_put(event_priv->desc->owner);
1570 lttng_kprobes_destroy_event_private(event_recorder);
1571 break;
b4a75708 1572
0648898e
MD		 1573 case LTTNG_KERNEL_ABI_KRETPROBE:
1574 module_put(event_priv->desc->owner);
1575 lttng_kretprobes_destroy_private(event_recorder);
1576 break;
b4a75708 1577
0648898e
MD		 1578 case LTTNG_KERNEL_ABI_SYSCALL:
1579 break;
4e3c1b9b 1580
0648898e
MD		 1581 case LTTNG_KERNEL_ABI_UPROBE:
1582 module_put(event_priv->desc->owner);
1583 lttng_uprobes_destroy_event_private(event_recorder);
1584 break;
3ef5cc03 1585
0648898e
MD		 1586 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1587 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1588 default:
1589 WARN_ON_ONCE(1);
1590 }
1591 list_del(&event_recorder->priv->node);
1592 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1593 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1594 break;
0648898e
MD		 1595 }
1596 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1597 {
1598 struct lttng_kernel_event_notifier *event_notifier =
1599 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1600
0648898e
MD		 1601 switch (event_notifier->priv->parent.instrumentation) {
1602 case LTTNG_KERNEL_ABI_TRACEPOINT:
1603 lttng_event_desc_put(event_notifier->priv->parent.desc);
1604 break;
b4a75708 1605
0648898e
MD		 1606 case LTTNG_KERNEL_ABI_KPROBE:
1607 module_put(event_notifier->priv->parent.desc->owner);
1608 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1609 break;
b4a75708 1610
0648898e
MD		 1611 case LTTNG_KERNEL_ABI_SYSCALL:
1612 break;
b4a75708 1613
0648898e
MD		 1614 case LTTNG_KERNEL_ABI_UPROBE:
1615 module_put(event_notifier->priv->parent.desc->owner);
1616 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1617 break;
1618
1619 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1620 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1621 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1622 default:
1623 WARN_ON_ONCE(1);
1624 }
1625 list_del(&event_notifier->priv->node);
1626 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1627 kmem_cache_free(event_notifier_cache, event_notifier);
1628 break;
1629 }
dffef45d
FD		 1630 default:
1631 WARN_ON_ONCE(1);
1632 }
dffef45d
FD		 1633}
1634
d1f652f8
MD		 1635struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1636 enum tracker_type tracker_type)
e0130fab 1637{
d1f652f8
MD		 1638 switch (tracker_type) {
1639 case TRACKER_PID:
1640 return &session->pid_tracker;
1641 case TRACKER_VPID:
1642 return &session->vpid_tracker;
1643 case TRACKER_UID:
1644 return &session->uid_tracker;
1645 case TRACKER_VUID:
1646 return &session->vuid_tracker;
1647 case TRACKER_GID:
1648 return &session->gid_tracker;
1649 case TRACKER_VGID:
1650 return &session->vgid_tracker;
1651 default:
1652 WARN_ON_ONCE(1);
1653 return NULL;
1654 }
1655}
1656
1657int lttng_session_track_id(struct lttng_session *session,
1658 enum tracker_type tracker_type, int id)
1659{
1660 struct lttng_id_tracker *tracker;
e0130fab
MD		 1661 int ret;
1662
d1f652f8
MD		 1663 tracker = get_tracker(session, tracker_type);
1664 if (!tracker)
1665 return -EINVAL;
1666 if (id < -1)
e0130fab
MD		 1667 return -EINVAL;
1668 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1669 if (id == -1) {
1670 /* track all ids: destroy tracker. */
1671 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1672 ret = 0;
1673 } else {
d1f652f8 1674 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1675 }
e0130fab
MD		 1676 mutex_unlock(&sessions_mutex);
1677 return ret;
1678}
1679
d1f652f8
MD		 1680int lttng_session_untrack_id(struct lttng_session *session,
1681 enum tracker_type tracker_type, int id)
e0130fab 1682{
d1f652f8 1683 struct lttng_id_tracker *tracker;
e0130fab
MD		 1684 int ret;
1685
d1f652f8
MD		 1686 tracker = get_tracker(session, tracker_type);
1687 if (!tracker)
1688 return -EINVAL;
1689 if (id < -1)
e0130fab
MD		 1690 return -EINVAL;
1691 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1692 if (id == -1) {
1693 /* untrack all ids: replace by empty tracker. */
1694 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1695 } else {
d1f652f8 1696 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1697 }
e0130fab
MD		 1698 mutex_unlock(&sessions_mutex);
1699 return ret;
1700}
1701
7e6f9ef6 1702static
d1f652f8 1703void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1704{
d1f652f8
MD		 1705 struct lttng_id_tracker *id_tracker = m->private;
1706 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1707 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1708 int iter = 0, i;
1709
1710 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1711 if (id_tracker_p) {
1712 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1713 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1714
f934e302 1715 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1716 if (iter++ >= *pos)
1717 return e;
1718 }
1719 }
1720 } else {
d1f652f8 1721 /* ID tracker disabled. */
7e6f9ef6 1722 if (iter >= *pos && iter == 0) {
d1f652f8 1723 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1724 }
1725 iter++;
1726 }
1727 /* End of list */
1728 return NULL;
1729}
1730
1731/* Called with sessions_mutex held. */
1732static
d1f652f8 1733void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1734{
d1f652f8
MD		 1735 struct lttng_id_tracker *id_tracker = m->private;
1736 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1737 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1738 int iter = 0, i;
1739
1740 (*ppos)++;
d1f652f8
MD		 1741 if (id_tracker_p) {
1742 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1743 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1744
f934e302 1745 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1746 if (iter++ >= *ppos)
1747 return e;
1748 }
1749 }
1750 } else {
d1f652f8 1751 /* ID tracker disabled. */
7e6f9ef6 1752 if (iter >= *ppos && iter == 0)
d1f652f8 1753 return p; /* empty tracker */
7e6f9ef6
MD		 1754 iter++;
1755 }
1756
1757 /* End of list */
1758 return NULL;
1759}
1760
1761static
d1f652f8 1762void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1763{
1764 mutex_unlock(&sessions_mutex);
1765}
1766
1767static
d1f652f8 1768int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1769{
d1f652f8
MD		 1770 struct lttng_id_tracker *id_tracker = m->private;
1771 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1772 int id;
7e6f9ef6 1773
d1f652f8 1774 if (p == id_tracker_p) {
7e6f9ef6 1775 /* Tracker disabled. */
d1f652f8 1776 id = -1;
7e6f9ef6 1777 } else {
d1f652f8 1778 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1779
d1f652f8
MD		 1780 id = lttng_id_tracker_get_node_id(e);
1781 }
1782 switch (id_tracker->tracker_type) {
1783 case TRACKER_PID:
1784 seq_printf(m, "process { pid = %d; };\n", id);
1785 break;
1786 case TRACKER_VPID:
1787 seq_printf(m, "process { vpid = %d; };\n", id);
1788 break;
1789 case TRACKER_UID:
1790 seq_printf(m, "user { uid = %d; };\n", id);
1791 break;
1792 case TRACKER_VUID:
1793 seq_printf(m, "user { vuid = %d; };\n", id);
1794 break;
1795 case TRACKER_GID:
1796 seq_printf(m, "group { gid = %d; };\n", id);
1797 break;
1798 case TRACKER_VGID:
1799 seq_printf(m, "group { vgid = %d; };\n", id);
1800 break;
1801 default:
1802 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1803 }
7e6f9ef6
MD		 1804 return 0;
1805}
1806
1807static
d1f652f8
MD		 1808const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1809 .start = id_list_start,
1810 .next = id_list_next,
1811 .stop = id_list_stop,
1812 .show = id_list_show,
7e6f9ef6
MD		 1813};
1814
1815static
d1f652f8 1816int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1817{
d1f652f8 1818 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1819}
1820
1821static
d1f652f8 1822int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1823{
1824 struct seq_file *m = file->private_data;
d1f652f8 1825 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1826 int ret;
1827
d1f652f8 1828 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1829 ret = seq_release(inode, file);
d1f652f8
MD		 1830 if (!ret)
1831 fput(id_tracker->session->file);
7e6f9ef6
MD		 1832 return ret;
1833}
1834
d1f652f8 1835const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1836 .owner = THIS_MODULE,
d1f652f8 1837 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1838 .read = seq_read,
1839 .llseek = seq_lseek,
d1f652f8 1840 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1841};
1842
d1f652f8
MD		 1843int lttng_session_list_tracker_ids(struct lttng_session *session,
1844 enum tracker_type tracker_type)
7e6f9ef6 1845{
d1f652f8 1846 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1847 struct seq_file *m;
1848 int file_fd, ret;
1849
1850 file_fd = lttng_get_unused_fd();
1851 if (file_fd < 0) {
1852 ret = file_fd;
1853 goto fd_error;
1854 }
1855
d1f652f8
MD		 1856 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1857 &lttng_tracker_ids_list_fops,
7e6f9ef6 1858 NULL, O_RDWR);
d1f652f8
MD		 1859 if (IS_ERR(tracker_ids_list_file)) {
1860 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1861 goto file_error;
1862 }
98d7281c
MJ		 1863 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1864 ret = -EOVERFLOW;
9c1f4643
MD		 1865 goto refcount_error;
1866 }
d1f652f8 1867 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1868 if (ret < 0)
1869 goto open_error;
d1f652f8
MD		 1870 m = tracker_ids_list_file->private_data;
1871
1872 m->private = get_tracker(session, tracker_type);
1873 BUG_ON(!m->private);
1874 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1875
1876 return file_fd;
1877
1878open_error:
9c1f4643
MD		 1879 atomic_long_dec(&session->file->f_count);
1880refcount_error:
d1f652f8 1881 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1882file_error:
1883 put_unused_fd(file_fd);
1884fd_error:
1885 return ret;
1886}
1887
3c997079
MD		 1888/*
1889 * Enabler management.
1890 */
1891static
4993071a
PP		 1892int lttng_match_enabler_star_glob(const char *desc_name,
1893 const char *pattern)
3c997079 1894{
cbc19040
MD		 1895 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1896 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1897 return 0;
1898 return 1;
1899}
1900
1901static
4ecb5ad5
MD		 1902int lttng_match_enabler_name(const char *desc_name,
1903 const char *name)
3c997079 1904{
4ecb5ad5 1905 if (strcmp(desc_name, name))
3c997079
MD		 1906 return 0;
1907 return 1;
1908}
1909
437d5aa5 1910int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
3c997079
MD		 1911 struct lttng_enabler *enabler)
1912{
4ecb5ad5 1913 const char *desc_name, *enabler_name;
badfe9f5 1914 bool compat = false, entry = false;
4ecb5ad5
MD		 1915
1916 enabler_name = enabler->event_param.name;
1917 switch (enabler->event_param.instrumentation) {
606828e4 1918 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1919 desc_name = desc->event_name;
3b861b22
FD		 1920 switch (enabler->format_type) {
1921 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1922 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1923 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1924 return lttng_match_enabler_name(desc_name, enabler_name);
1925 default:
1926 return -EINVAL;
1927 }
4ecb5ad5 1928 break;
b4a75708 1929
606828e4 1930 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1931 desc_name = desc->event_name;
badfe9f5 1932 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1933 desc_name += strlen("compat_");
badfe9f5
MD		 1934 compat = true;
1935 }
4ecb5ad5
MD		 1936 if (!strncmp(desc_name, "syscall_exit_",
1937 strlen("syscall_exit_"))) {
1938 desc_name += strlen("syscall_exit_");
1939 } else if (!strncmp(desc_name, "syscall_entry_",
1940 strlen("syscall_entry_"))) {
1941 desc_name += strlen("syscall_entry_");
badfe9f5 1942 entry = true;
4ecb5ad5
MD		 1943 } else {
1944 WARN_ON_ONCE(1);
1945 return -EINVAL;
1946 }
badfe9f5 1947 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1948 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1949 break;
606828e4 1950 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1951 if (!entry)
1952 return 0;
1953 break;
606828e4 1954 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1955 if (entry)
1956 return 0;
1957 break;
1958 default:
1959 return -EINVAL;
1960 }
1961 switch (enabler->event_param.u.syscall.abi) {
606828e4 1962 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1963 break;
606828e4 1964 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1965 if (compat)
1966 return 0;
1967 break;
606828e4 1968 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1969 if (!compat)
1970 return 0;
1971 break;
1972 default:
1973 return -EINVAL;
1974 }
1975 switch (enabler->event_param.u.syscall.match) {
606828e4 1976 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1977 switch (enabler->format_type) {
1978 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1979 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1980 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1981 return lttng_match_enabler_name(desc_name, enabler_name);
1982 default:
1983 return -EINVAL;
1984 }
1985 break;
606828e4 1986 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 1987 return -EINVAL; /* Not implemented. */
1988 default:
1989 return -EINVAL;
1990 }
4ecb5ad5 1991 break;
b4a75708 1992
4ecb5ad5
MD		 1993 default:
1994 WARN_ON_ONCE(1);
1995 return -EINVAL;
1996 }
3c997079
MD		 1997}
1998
1999static
b2bc0bc8 2000int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2001 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2002{
b2bc0bc8
FD		 2003 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
2004 event_enabler);
2005
a67ba386 2006 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2007 return 0;
a67ba386
MD		 2008 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2009 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2010 return 1;
2011 else
2012 return 0;
2013}
2014
b01155ba
FD		 2015static
2016int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2017 struct lttng_kernel_event_notifier *event_notifier)
b01155ba
FD		 2018{
2019 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
2020 event_notifier_enabler);
2021
a67ba386 2022 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2023 return 0;
a67ba386
MD		 2024 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2025 && event_notifier->priv->group == event_notifier_enabler->group
2026 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2027 return 1;
2028 else
2029 return 0;
2030}
2031
3c997079 2032static
b2bc0bc8
FD		 2033struct lttng_enabler_ref *lttng_enabler_ref(
2034 struct list_head *enablers_ref_list,
3c997079
MD		 2035 struct lttng_enabler *enabler)
2036{
2037 struct lttng_enabler_ref *enabler_ref;
2038
b2bc0bc8 2039 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2040 if (enabler_ref->ref == enabler)
2041 return enabler_ref;
2042 }
2043 return NULL;
2044}
2045
3c997079 2046static
1b917d6b 2047void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2048{
b2bc0bc8 2049 struct lttng_session *session = event_enabler->chan->session;
437d5aa5
MD		 2050 struct lttng_kernel_probe_desc *probe_desc;
2051 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2052 int i;
2053 struct list_head *probe_list;
2054
2055 probe_list = lttng_get_probe_list_head();
2056 /*
2057 * For each probe event, if we find that a probe event matches
2058 * our enabler, create an associated lttng_event if not
2059 * already present.
2060 */
2061 list_for_each_entry(probe_desc, probe_list, head) {
2062 for (i = 0; i < probe_desc->nr_events; i++) {
2063 int found = 0;
2064 struct hlist_head *head;
a67ba386
MD		 2065 struct lttng_kernel_event_recorder_private *event_recorder_private;
2066 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2067
2068 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2069 if (!lttng_desc_match_enabler(desc,
2070 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2071 continue;
3c997079
MD		 2072
2073 /*
2074 * Check if already created.
2075 */
4a11ef1c
FD		 2076 head = utils_borrow_hash_table_bucket(
2077 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2078 desc->event_name);
a67ba386
MD		 2079 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2080 if (event_recorder_private->parent.desc == desc
2081 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2082 found = 1;
2083 }
2084 if (found)
2085 continue;
2086
2087 /*
2088 * We need to create an event for this
2089 * event probe.
2090 */
a67ba386
MD		 2091 event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan,
2092 NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT);
2093 if (!event_recorder) {
5a15f70c 2094 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2095 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2096 }
2097 }
2098 }
2099}
2100
b01155ba
FD		 2101static
2102void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2103{
2104 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2105 struct lttng_kernel_probe_desc *probe_desc;
2106 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2107 int i;
2108 struct list_head *probe_list;
2109
2110 probe_list = lttng_get_probe_list_head();
2111 /*
2112 * For each probe event, if we find that a probe event matches
2113 * our enabler, create an associated lttng_event_notifier if not
2114 * already present.
2115 */
2116 list_for_each_entry(probe_desc, probe_list, head) {
2117 for (i = 0; i < probe_desc->nr_events; i++) {
2118 int found = 0;
2119 struct hlist_head *head;
a67ba386
MD		 2120 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2121 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2122
2123 desc = probe_desc->event_desc[i];
2124 if (!lttng_desc_match_enabler(desc,
2125 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2126 continue;
2127
2128 /*
2129 * Check if already created.
2130 */
2131 head = utils_borrow_hash_table_bucket(
2132 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2133 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2134 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2135 if (event_notifier_priv->parent.desc == desc
2136 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2137 found = 1;
2138 }
2139 if (found)
2140 continue;
2141
2142 /*
2143 * We need to create a event_notifier for this event probe.
2144 */
2145 event_notifier = _lttng_event_notifier_create(desc,
2146 event_notifier_enabler->base.user_token,
99f52fcc 2147 event_notifier_enabler->error_counter_index,
a67ba386 2148 event_notifier_group, NULL,
606828e4 2149 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2150 if (IS_ERR(event_notifier)) {
2151 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2152 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2153 }
2154 }
2155 }
2156}
2157
33a39a3c 2158static
1b917d6b 2159void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2160{
2161 int ret;
2162
a67ba386 2163 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2164 WARN_ON_ONCE(ret);
2165}
2166
8a8ac9a8
FD		 2167static
2168void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2169{
2170 int ret;
2171
a67ba386 2172 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2173 WARN_ON_ONCE(ret);
a67ba386 2174 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2175 WARN_ON_ONCE(ret);
2176}
2177
33a39a3c 2178/*
a67ba386 2179 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2180 * tracepoint probes.
2181 * Should be called with sessions mutex held.
2182 */
2183static
b2bc0bc8 2184void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2185{
b2bc0bc8 2186 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2187 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2188 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2189 break;
b4a75708 2190
606828e4 2191 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2192 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2193 break;
b4a75708 2194
33a39a3c
MD		 2195 default:
2196 WARN_ON_ONCE(1);
2197 break;
2198 }
2199}
2200
3c997079 2201/*
b2bc0bc8 2202 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2203 * and add backward reference from the event to the enabler.
2204 * Should be called with sessions mutex held.
2205 */
2206static
b2bc0bc8 2207int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2208{
b2bc0bc8
FD		 2209 struct lttng_channel *chan = event_enabler->chan;
2210 struct lttng_session *session = event_enabler->chan->session;
2211 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2212 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2213
606828e4
MD		 2214 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2215 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2216 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2217 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2218 int enabled = base_enabler->enabled;
606828e4 2219 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2220
606828e4 2221 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1
MD		 2222 WRITE_ONCE(chan->syscall_all_entry, enabled);
2223
606828e4 2224 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1 2225 WRITE_ONCE(chan->syscall_all_exit, enabled);
badfe9f5
MD		 2226 }
2227
3c997079 2228 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2229 lttng_create_event_if_missing(event_enabler);
3c997079 2230
b2bc0bc8 2231 /* For each event matching event_enabler in session event list. */
a67ba386
MD		 2232 list_for_each_entry(event_recorder_priv, &session->events, node) {
2233 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2234 struct lttng_enabler_ref *enabler_ref;
2235
a67ba386 2236 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2237 continue;
a67ba386 2238 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2239 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2240 if (!enabler_ref) {
2241 /*
2242 * If no backward ref, create it.
b2bc0bc8 2243 * Add backward ref from event to event_enabler.
3c997079
MD		 2244 */
2245 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2246 if (!enabler_ref)
2247 return -ENOMEM;
b2bc0bc8 2248 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2249 list_add(&enabler_ref->node,
a67ba386 2250 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2251 }
2252
f127e61e
MD		 2253 /*
2254 * Link filter bytecodes if not linked yet.
2255 */
a67ba386 2256 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2257 lttng_static_ctx,
a67ba386 2258 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2259 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2260 }
2261 return 0;
2262}
2263
b01155ba 2264/*
a67ba386 2265 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2266 * tracepoint probes.
2267 * Should be called with sessions mutex held.
2268 */
2269static
2270void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2271{
2272 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2273 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2274 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2275 break;
b4a75708 2276
606828e4 2277 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2278 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2279 break;
b4a75708 2280
b01155ba
FD		 2281 default:
2282 WARN_ON_ONCE(1);
2283 break;
2284 }
2285}
2286
2287/*
2288 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2289 */
2290static
8a8ac9a8
FD		 2291int lttng_event_notifier_enabler_ref_event_notifiers(
2292 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2293{
2294 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2295 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2296 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2297
606828e4
MD		 2298 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2299 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2300 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2301 !strcmp(base_enabler->event_param.name, "*")) {
2302
2303 int enabled = base_enabler->enabled;
606828e4 2304 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2305
606828e4 2306 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2307 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2308
606828e4 2309 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2310 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2311
2312 }
2313
b01155ba
FD		 2314 /* First ensure that probe event_notifiers are created for this enabler. */
2315 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2316
2317 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2318 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2319 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2320 struct lttng_enabler_ref *enabler_ref;
2321
2322 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2323 continue;
2324
a67ba386 2325 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2326 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2327 if (!enabler_ref) {
2328 /*
2329 * If no backward ref, create it.
2330 * Add backward ref from event_notifier to enabler.
2331 */
2332 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2333 if (!enabler_ref)
2334 return -ENOMEM;
2335
2336 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2337 event_notifier_enabler);
2338 list_add(&enabler_ref->node,
a67ba386 2339 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2340 }
2341
2342 /*
2343 * Link filter bytecodes if not linked yet.
2344 */
a67ba386
MD		 2345 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2346 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2347 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2348
2349 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2350 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2351 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2352 &event_notifier_enabler->capture_bytecode_head);
2353
a67ba386 2354 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2355 }
2356 return 0;
2357}
2358
3c997079
MD		 2359/*
2360 * Called at module load: connect the probe on all enablers matching
2361 * this event.
2362 * Called with sessions lock held.
2363 */
2364int lttng_fix_pending_events(void)
2365{
2366 struct lttng_session *session;
2367
2368 list_for_each_entry(session, &sessions, list)
b2bc0bc8 2369 lttng_session_lazy_sync_event_enablers(session);
3c997079
MD		 2370 return 0;
2371}
2372
b01155ba
FD		 2373static bool lttng_event_notifier_group_has_active_event_notifiers(
2374 struct lttng_event_notifier_group *event_notifier_group)
2375{
2376 struct lttng_event_notifier_enabler *event_notifier_enabler;
2377
2378 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2379 node) {
2380 if (event_notifier_enabler->base.enabled)
2381 return true;
2382 }
2383 return false;
2384}
2385
2386bool lttng_event_notifier_active(void)
2387{
2388 struct lttng_event_notifier_group *event_notifier_group;
2389
2390 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2391 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2392 return true;
2393 }
2394 return false;
2395}
2396
2397int lttng_fix_pending_event_notifiers(void)
2398{
2399 struct lttng_event_notifier_group *event_notifier_group;
2400
2401 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2402 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2403 return 0;
2404}
2405
b2bc0bc8
FD		 2406struct lttng_event_enabler *lttng_event_enabler_create(
2407 enum lttng_enabler_format_type format_type,
606828e4 2408 struct lttng_kernel_abi_event *event_param,
3c997079
MD		 2409 struct lttng_channel *chan)
2410{
b2bc0bc8 2411 struct lttng_event_enabler *event_enabler;
3c997079 2412
b2bc0bc8
FD		 2413 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2414 if (!event_enabler)
3c997079 2415 return NULL;
b2bc0bc8
FD		 2416 event_enabler->base.format_type = format_type;
2417 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2418 memcpy(&event_enabler->base.event_param, event_param,
2419 sizeof(event_enabler->base.event_param));
2420 event_enabler->chan = chan;
3c997079 2421 /* ctx left NULL */
b2bc0bc8 2422 event_enabler->base.enabled = 0;
3c997079 2423 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2424 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2425 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2426 mutex_unlock(&sessions_mutex);
b2bc0bc8 2427 return event_enabler;
3c997079
MD		 2428}
2429
b2bc0bc8 2430int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2431{
2432 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2433 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2434 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2435 mutex_unlock(&sessions_mutex);
2436 return 0;
2437}
2438
b2bc0bc8 2439int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2440{
2441 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2442 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2443 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2444 mutex_unlock(&sessions_mutex);
2445 return 0;
2446}
2447
b2bc0bc8 2448static
183e8b3a 2449int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
606828e4 2450 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2451{
d64ca521 2452 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2453 uint32_t bytecode_len;
2454 int ret;
2455
2456 ret = get_user(bytecode_len, &bytecode->len);
2457 if (ret)
2458 return ret;
52cfcdf3 2459 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2460 GFP_KERNEL);
2461 if (!bytecode_node)
2462 return -ENOMEM;
2463 ret = copy_from_user(&bytecode_node->bc, bytecode,
2464 sizeof(*bytecode) + bytecode_len);
2465 if (ret)
2466 goto error_free;
b2bc0bc8 2467
8a445457 2468 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2469 bytecode_node->enabler = enabler;
2470 /* Enforce length based on allocated size */
2471 bytecode_node->bc.len = bytecode_len;
2472 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2473
07dfc1d0
MD		 2474 return 0;
2475
2476error_free:
52cfcdf3 2477 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2478 return ret;
2479}
2480
183e8b3a 2481int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2482 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2483{
2484 int ret;
183e8b3a 2485 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2486 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2487 if (ret)
2488 goto error;
2489
2490 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2491 return 0;
2492
2493error:
2494 return ret;
2495}
2496
e2d5dbc7 2497int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2498 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2499{
2500
e2d5dbc7 2501 switch (event->priv->instrumentation) {
606828e4 2502 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2503 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2504 default:
2505 return -EINVAL;
2506 }
2507}
2508
3c997079
MD		 2509static
2510void lttng_enabler_destroy(struct lttng_enabler *enabler)
2511{
d64ca521 2512 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2513
2514 /* Destroy filter bytecode */
2515 list_for_each_entry_safe(filter_node, tmp_filter_node,
2516 &enabler->filter_bytecode_head, node) {
52cfcdf3 2517 lttng_kvfree(filter_node);
07dfc1d0 2518 }
b2bc0bc8
FD		 2519}
2520
2521static
2522void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2523{
2524 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2525
b2bc0bc8
FD		 2526 list_del(&event_enabler->node);
2527 kfree(event_enabler);
3c997079
MD		 2528}
2529
dffef45d
FD		 2530struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2531 struct lttng_event_notifier_group *event_notifier_group,
2532 enum lttng_enabler_format_type format_type,
606828e4 2533 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2534{
2535 struct lttng_event_notifier_enabler *event_notifier_enabler;
2536
2537 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2538 if (!event_notifier_enabler)
2539 return NULL;
2540
2541 event_notifier_enabler->base.format_type = format_type;
2542 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2543 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2544
99f52fcc 2545 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2546 event_notifier_enabler->num_captures = 0;
dffef45d 2547
8a8ac9a8
FD		 2548 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2549 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2550
2551 event_notifier_enabler->base.enabled = 0;
2552 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2553 event_notifier_enabler->group = event_notifier_group;
2554
2555 mutex_lock(&sessions_mutex);
2556 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2557 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2558
2559 mutex_unlock(&sessions_mutex);
2560
2561 return event_notifier_enabler;
2562}
2563
2564int lttng_event_notifier_enabler_enable(
2565 struct lttng_event_notifier_enabler *event_notifier_enabler)
2566{
2567 mutex_lock(&sessions_mutex);
2568 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2569 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2570 mutex_unlock(&sessions_mutex);
2571 return 0;
2572}
2573
2574int lttng_event_notifier_enabler_disable(
2575 struct lttng_event_notifier_enabler *event_notifier_enabler)
2576{
2577 mutex_lock(&sessions_mutex);
2578 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2579 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2580 mutex_unlock(&sessions_mutex);
2581 return 0;
2582}
2583
183e8b3a 2584int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2585 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2586 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2587{
2588 int ret;
2589
183e8b3a 2590 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2591 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2592 bytecode);
2593 if (ret)
2594 goto error;
2595
b01155ba 2596 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2597 return 0;
2598
2599error:
2600 return ret;
2601}
2602
99d223ad
FD		 2603int lttng_event_notifier_enabler_attach_capture_bytecode(
2604 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2605 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2606{
d64ca521 2607 struct lttng_kernel_bytecode_node *bytecode_node;
99d223ad
FD		 2608 struct lttng_enabler *enabler =
2609 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2610 uint32_t bytecode_len;
2611 int ret;
2612
2613 ret = get_user(bytecode_len, &bytecode->len);
2614 if (ret)
2615 return ret;
2616
2617 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2618 GFP_KERNEL);
2619 if (!bytecode_node)
2620 return -ENOMEM;
2621
2622 ret = copy_from_user(&bytecode_node->bc, bytecode,
2623 sizeof(*bytecode) + bytecode_len);
2624 if (ret)
2625 goto error_free;
2626
8a445457 2627 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2628 bytecode_node->enabler = enabler;
2629
2630 /* Enforce length based on allocated size */
2631 bytecode_node->bc.len = bytecode_len;
2632 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2633
2634 event_notifier_enabler->num_captures++;
2635
2636 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2637 goto end;
2638
2639error_free:
2640 lttng_kvfree(bytecode_node);
2641end:
2642 return ret;
2643}
2644
dffef45d
FD		 2645static
2646void lttng_event_notifier_enabler_destroy(
2647 struct lttng_event_notifier_enabler *event_notifier_enabler)
2648{
2649 if (!event_notifier_enabler) {
2650 return;
2651 }
2652
2653 list_del(&event_notifier_enabler->node);
2654
2655 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2656 kfree(event_notifier_enabler);
2657}
2658
3c997079 2659/*
b2bc0bc8 2660 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2661 * session.
2662 * Should be called with sessions mutex held.
2663 */
2664static
b2bc0bc8 2665void lttng_session_sync_event_enablers(struct lttng_session *session)
3c997079 2666{
b2bc0bc8 2667 struct lttng_event_enabler *event_enabler;
a67ba386 2668 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2669
b2bc0bc8
FD		 2670 list_for_each_entry(event_enabler, &session->enablers_head, node)
2671 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2672 /*
2673 * For each event, if at least one of its enablers is enabled,
2674 * and its channel and session transient states are enabled, we
2675 * enable the event, else we disable it.
2676 */
a67ba386
MD		 2677 list_for_each_entry(event_recorder_priv, &session->events, node) {
2678 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2679 struct lttng_enabler_ref *enabler_ref;
218585b9 2680 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2681 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2682 int nr_filters = 0;
3c997079 2683
a67ba386 2684 switch (event_recorder_priv->parent.instrumentation) {
606828e4
MD		 2685 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2686 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2687 /* Enable events */
2688 list_for_each_entry(enabler_ref,
a67ba386 2689 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2690 if (enabler_ref->ref->enabled) {
2691 enabled = 1;
2692 break;
2693 }
2694 }
4ecb5ad5 2695 break;
b4a75708 2696
4ecb5ad5 2697 default:
3c997079
MD		 2698 /* Not handled with lazy sync. */
2699 continue;
2700 }
2701 /*
2702 * Enabled state is based on union of enablers, with
2703 * intesection of session and channel transient enable
2704 * states.
2705 */
a67ba386 2706 enabled = enabled && session->tstate && event_recorder->chan->tstate;
3c997079 2707
a67ba386 2708 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2709 /*
2710 * Sync tracepoint registration with event enabled
2711 * state.
2712 */
2713 if (enabled) {
a67ba386 2714 register_event(event_recorder);
3c997079 2715 } else {
a67ba386 2716 _lttng_event_unregister(event_recorder);
3c997079 2717 }
07dfc1d0
MD		 2718
2719 /* Check if has enablers without bytecode enabled */
2720 list_for_each_entry(enabler_ref,
a67ba386 2721 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2722 if (enabler_ref->ref->enabled
2723 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2724 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2725 break;
2726 }
2727 }
a67ba386 2728 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2729 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2730
2731 /* Enable filters */
2732 list_for_each_entry(runtime,
e2d5dbc7 2733 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2734 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2735 nr_filters++;
2736 }
2737 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2738 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2739 }
2740}
2741
2742/*
2743 * Apply enablers to session events, adding events to session if need
2744 * be. It is required after each modification applied to an active
2745 * session, and right before session "start".
2746 * "lazy" sync means we only sync if required.
2747 * Should be called with sessions mutex held.
2748 */
2749static
b2bc0bc8 2750void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
3c997079
MD		 2751{
2752 /* We can skip if session is not active */
2753 if (!session->active)
2754 return;
b2bc0bc8 2755 lttng_session_sync_event_enablers(session);
3c997079
MD		 2756}
2757
b01155ba
FD		 2758static
2759void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2760{
2761 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2762 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2763
2764 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2765 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2766
2767 /*
2768 * For each event_notifier, if at least one of its enablers is enabled,
2769 * we enable the event_notifier, else we disable it.
2770 */
a67ba386
MD		 2771 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2772 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2773 struct lttng_enabler_ref *enabler_ref;
218585b9 2774 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2775 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2776 int nr_filters = 0, nr_captures = 0;
b01155ba 2777
a67ba386 2778 switch (event_notifier_priv->parent.instrumentation) {
606828e4
MD		 2779 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2780 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2781 /* Enable event_notifiers */
2782 list_for_each_entry(enabler_ref,
a67ba386 2783 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2784 if (enabler_ref->ref->enabled) {
2785 enabled = 1;
2786 break;
2787 }
2788 }
2789 break;
b4a75708 2790
b01155ba
FD		 2791 default:
2792 /* Not handled with sync. */
2793 continue;
2794 }
2795
a67ba386 2796 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2797 /*
2798 * Sync tracepoint registration with event_notifier enabled
2799 * state.
2800 */
2801 if (enabled) {
a67ba386 2802 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2803 register_event_notifier(event_notifier);
2804 } else {
a67ba386 2805 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2806 _lttng_event_notifier_unregister(event_notifier);
2807 }
2808
2809 /* Check if has enablers without bytecode enabled */
2810 list_for_each_entry(enabler_ref,
a67ba386 2811 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2812 if (enabler_ref->ref->enabled
2813 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2814 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2815 break;
2816 }
2817 }
a67ba386 2818 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2819 has_enablers_without_filter_bytecode;
b01155ba
FD		 2820
2821 /* Enable filters */
2822 list_for_each_entry(runtime,
e2d5dbc7 2823 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2824 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2825 nr_filters++;
2826 }
2827 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2828 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2829
2830 /* Enable captures */
2831 list_for_each_entry(runtime,
e2d5dbc7 2832 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2833 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2834 nr_captures++;
2835 }
2836 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2837 }
2838}
2839
1ec3f75a 2840/*
d83004aa
JD		 2841 * Serialize at most one packet worth of metadata into a metadata
2842 * channel.
92d9f5e6
MD		 2843 * We grab the metadata cache mutex to get exclusive access to our metadata
2844 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2845 * allows us to do racy operations such as looking for remaining space left in
2846 * packet and write, since mutual exclusion protects us from concurrent writes.
2847 * Mutual exclusion on the metadata cache allow us to read the cache content
2848 * without racing against reallocation of the cache by updates.
35097f36
JD		 2849 * Returns the number of bytes written in the channel, 0 if no data
2850 * was written and a negative value on error.
1ec3f75a 2851 */
b3b8072b 2852int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2853 struct channel *chan, bool *coherent)
d83004aa 2854{
8a57ec02 2855 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2856 int ret = 0;
2857 size_t len, reserve_len;
2858
f613e3e6 2859 /*
92d9f5e6
MD		 2860 * Ensure we support mutiple get_next / put sequences followed by
2861 * put_next. The metadata cache lock protects reading the metadata
2862 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2863 * "flush" operations on the buffer invoked by different processes.
2864 * Moreover, since the metadata cache memory can be reallocated, we
2865 * need to have exclusive access against updates even though we only
2866 * read it.
f613e3e6 2867 */
92d9f5e6 2868 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2869 WARN_ON(stream->metadata_in < stream->metadata_out);
2870 if (stream->metadata_in != stream->metadata_out)
de23d59d 2871 goto end;
f613e3e6 2872
9616f0bf
JD		 2873 /* Metadata regenerated, change the version. */
2874 if (stream->metadata_cache->version != stream->version)
2875 stream->version = stream->metadata_cache->version;
2876
d83004aa 2877 len = stream->metadata_cache->metadata_written -
f613e3e6 2878 stream->metadata_in;
9de2c215 2879 if (!len)
de23d59d 2880 goto end;
d83004aa 2881 reserve_len = min_t(size_t,
4a399b76 2882 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2883 len);
a775608d 2884 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2885 sizeof(char), NULL);
d83004aa
JD		 2886 /*
2887 * If reservation failed, return an error to the caller.
2888 */
c2fb9c1c 2889 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2890 if (ret != 0) {
2891 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2892 stream->coherent = false;
d83004aa
JD		 2893 goto end;
2894 }
b3b8072b 2895 stream->transport->ops.event_write(&ctx,
f613e3e6 2896 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2897 reserve_len);
b3b8072b 2898 stream->transport->ops.event_commit(&ctx);
f613e3e6 2899 stream->metadata_in += reserve_len;
3e75e2a7 2900 if (reserve_len < len)
8b97fd42
MD		 2901 stream->coherent = false;
2902 else
2903 stream->coherent = true;
d83004aa
JD		 2904 ret = reserve_len;
2905
2906end:
8b97fd42
MD		 2907 if (coherent)
2908 *coherent = stream->coherent;
92d9f5e6 2909 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2910 return ret;
2911}
2912
8b97fd42
MD		 2913static
2914void lttng_metadata_begin(struct lttng_session *session)
2915{
3e75e2a7
MD		 2916 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2917 mutex_lock(&session->metadata_cache->lock);
8b97fd42
MD		 2918}
2919
2920static
2921void lttng_metadata_end(struct lttng_session *session)
2922{
3e75e2a7
MD		 2923 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2924 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2925 struct lttng_metadata_stream *stream;
2926
3e75e2a7
MD		 2927 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2928 wake_up_interruptible(&stream->read_wait);
92143b2c 2929 mutex_unlock(&session->metadata_cache->lock);
3e75e2a7 2930 }
8b97fd42
MD		 2931}
2932
d83004aa
JD		 2933/*
2934 * Write the metadata to the metadata cache.
2935 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2936 * The metadata cache lock protects us from concurrent read access from
2937 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2938 * The content of the printf is printed as a single atomic metadata
2939 * transaction.
d83004aa 2940 */
a90917c3 2941int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 2942 const char *fmt, ...)
2943{
c099397a 2944 char *str;
d83004aa 2945 size_t len;
c099397a
MD		 2946 va_list ap;
2947
585e5dcc 2948 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2949
2950 va_start(ap, fmt);
2951 str = kvasprintf(GFP_KERNEL, fmt, ap);
2952 va_end(ap);
2953 if (!str)
2954 return -ENOMEM;
2955
1ec3f75a 2956 len = strlen(str);
3e75e2a7 2957 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 2958 if (session->metadata_cache->metadata_written + len >
2959 session->metadata_cache->cache_alloc) {
2960 char *tmp_cache_realloc;
2961 unsigned int tmp_cache_alloc_size;
2962
2963 tmp_cache_alloc_size = max_t(unsigned int,
2964 session->metadata_cache->cache_alloc + len,
2965 session->metadata_cache->cache_alloc << 1);
0ca42eb7 2966 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2967 if (!tmp_cache_realloc)
2968 goto err;
a606b6e8
ML		 2969 if (session->metadata_cache->data) {
2970 memcpy(tmp_cache_realloc,
2971 session->metadata_cache->data,
2972 session->metadata_cache->cache_alloc);
2973 vfree(session->metadata_cache->data);
2974 }
2975
d83004aa
JD		 2976 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2977 session->metadata_cache->data = tmp_cache_realloc;
c099397a 2978 }
d83004aa
JD		 2979 memcpy(session->metadata_cache->data +
2980 session->metadata_cache->metadata_written,
2981 str, len);
2982 session->metadata_cache->metadata_written += len;
c099397a 2983 kfree(str);
d83004aa 2984
d83004aa
JD		 2985 return 0;
2986
2987err:
2988 kfree(str);
2989 return -ENOMEM;
c099397a
MD		 2990}
2991
f513b2bf
MD		 2992static
2993int print_tabs(struct lttng_session *session, size_t nesting)
2994{
2995 size_t i;
2996
2997 for (i = 0; i < nesting; i++) {
2998 int ret;
2999
3000 ret = lttng_metadata_printf(session, " ");
3001 if (ret) {
3002 return ret;
3003 }
3004 }
3005 return 0;
3006}
3007
ceabb767
MD		 3008static
3009int lttng_field_name_statedump(struct lttng_session *session,
437d5aa5 3010 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3011 size_t nesting)
3012{
3013 return lttng_metadata_printf(session, " _%s;\n", field->name);
3014}
3015
3016static
3017int _lttng_integer_type_statedump(struct lttng_session *session,
437d5aa5
MD		 3018 const struct lttng_kernel_type_integer *type,
3019 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3020 size_t nesting)
3021{
3022 int ret;
3023
ceabb767
MD		 3024 ret = print_tabs(session, nesting);
3025 if (ret)
3026 return ret;
3027 ret = lttng_metadata_printf(session,
3028 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3029 type->size,
3030 type->alignment,
3031 type->signedness,
3032 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3033 ? "none"
437d5aa5 3034 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3035 ? "UTF8"
3036 : "ASCII",
437d5aa5 3037 type->base,
ceabb767 3038#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3039 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3040#else
437d5aa5 3041 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3042#endif
3043 );
3044 return ret;
3045}
3046
f513b2bf
MD		 3047/*
3048 * Must be called with sessions_mutex held.
3049 */
3050static
3051int _lttng_struct_type_statedump(struct lttng_session *session,
437d5aa5 3052 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3053 size_t nesting)
3054{
51ef4536 3055 const char *prev_field_name = NULL;
f513b2bf
MD		 3056 int ret;
3057 uint32_t i, nr_fields;
ceabb767
MD		 3058 unsigned int alignment;
3059
f513b2bf
MD		 3060 ret = print_tabs(session, nesting);
3061 if (ret)
3062 return ret;
3063 ret = lttng_metadata_printf(session,
3064 "struct {\n");
3065 if (ret)
3066 return ret;
437d5aa5 3067 nr_fields = type->nr_fields;
f513b2bf 3068 for (i = 0; i < nr_fields; i++) {
437d5aa5 3069 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3070
437d5aa5 3071 iter_field = type->fields[i];
51ef4536 3072 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3073 if (ret)
3074 return ret;
3075 }
3076 ret = print_tabs(session, nesting);
3077 if (ret)
3078 return ret;
437d5aa5 3079 alignment = type->alignment;
ceabb767
MD		 3080 if (alignment) {
3081 ret = lttng_metadata_printf(session,
3082 "} align(%u)",
3083 alignment);
3084 } else {
3085 ret = lttng_metadata_printf(session,
3086 "}");
3087 }
f513b2bf
MD		 3088 return ret;
3089}
3090
3091/*
3092 * Must be called with sessions_mutex held.
3093 */
3094static
ceabb767 3095int _lttng_struct_field_statedump(struct lttng_session *session,
437d5aa5 3096 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3097 size_t nesting)
3098{
3099 int ret;
3100
3101 ret = _lttng_struct_type_statedump(session,
437d5aa5 3102 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3103 if (ret)
3104 return ret;
ceabb767 3105 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3106}
3107
65c85aa6
MD		 3108/*
3109 * Must be called with sessions_mutex held.
3110 */
3111static
3112int _lttng_variant_type_statedump(struct lttng_session *session,
437d5aa5 3113 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3114 size_t nesting,
3115 const char *prev_field_name)
65c85aa6 3116{
51ef4536 3117 const char *tag_name;
65c85aa6
MD		 3118 int ret;
3119 uint32_t i, nr_choices;
3120
51ef4536
MD		 3121 tag_name = type->tag_name;
3122 if (!tag_name)
3123 tag_name = prev_field_name;
3124 if (!tag_name)
3125 return -EINVAL;
ceabb767
MD		 3126 /*
3127 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3128 */
437d5aa5 3129 if (type->alignment != 0)
ceabb767 3130 return -EINVAL;
65c85aa6
MD		 3131 ret = print_tabs(session, nesting);
3132 if (ret)
3133 return ret;
3134 ret = lttng_metadata_printf(session,
3135 "variant <_%s> {\n",
51ef4536 3136 tag_name);
65c85aa6
MD		 3137 if (ret)
3138 return ret;
437d5aa5 3139 nr_choices = type->nr_choices;
65c85aa6 3140 for (i = 0; i < nr_choices; i++) {
437d5aa5 3141 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3142
437d5aa5 3143 iter_field = type->choices[i];
51ef4536 3144 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3145 if (ret)
3146 return ret;
3147 }
3148 ret = print_tabs(session, nesting);
3149 if (ret)
3150 return ret;
3151 ret = lttng_metadata_printf(session,
3152 "}");
3153 return ret;
3154}
3155
3156/*
3157 * Must be called with sessions_mutex held.
3158 */
3159static
ceabb767 3160int _lttng_variant_field_statedump(struct lttng_session *session,
437d5aa5 3161 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3162 size_t nesting,
3163 const char *prev_field_name)
65c85aa6
MD		 3164{
3165 int ret;
3166
3167 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3168 lttng_kernel_get_type_variant(field->type), nesting,
3169 prev_field_name);
65c85aa6
MD		 3170 if (ret)
3171 return ret;
ceabb767 3172 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3173}
3174
f513b2bf
MD		 3175/*
3176 * Must be called with sessions_mutex held.
3177 */
3178static
ceabb767 3179int _lttng_array_field_statedump(struct lttng_session *session,
437d5aa5 3180 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3181 size_t nesting)
3182{
3183 int ret;
437d5aa5
MD		 3184 const struct lttng_kernel_type_array *array_type;
3185 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3186
437d5aa5
MD		 3187 array_type = lttng_kernel_get_type_array(field->type);
3188 WARN_ON_ONCE(!array_type);
ceabb767 3189
437d5aa5 3190 if (array_type->alignment) {
ceabb767 3191 ret = print_tabs(session, nesting);
f513b2bf
MD		 3192 if (ret)
3193 return ret;
ceabb767
MD		 3194 ret = lttng_metadata_printf(session,
3195 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3196 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3197 field->name);
3198 if (ret)
3199 return ret;
3200 }
3201 /*
3202 * Nested compound types: Only array of structures and variants are
3203 * currently supported.
3204 */
437d5aa5 3205 elem_type = array_type->elem_type;
12bb2edb
MD		 3206 switch (elem_type->type) {
3207 case lttng_kernel_type_integer:
437d5aa5
MD		 3208 case lttng_kernel_type_struct:
3209 case lttng_kernel_type_variant:
3210 ret = _lttng_type_statedump(session, elem_type,
3211 array_type->encoding, nesting);
65c85aa6
MD		 3212 if (ret)
3213 return ret;
3214 break;
ceabb767 3215
f513b2bf
MD		 3216 default:
3217 return -EINVAL;
3218 }
3219 ret = lttng_metadata_printf(session,
3220 " _%s[%u];\n",
3221 field->name,
437d5aa5 3222 array_type->length);
f513b2bf
MD		 3223 return ret;
3224}
3225
3226/*
3227 * Must be called with sessions_mutex held.
3228 */
3229static
ceabb767 3230int _lttng_sequence_field_statedump(struct lttng_session *session,
437d5aa5 3231 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3232 size_t nesting,
3233 const char *prev_field_name)
f513b2bf
MD		 3234{
3235 int ret;
3236 const char *length_name;
437d5aa5
MD		 3237 const struct lttng_kernel_type_sequence *sequence_type;
3238 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3239
437d5aa5
MD		 3240 sequence_type = lttng_kernel_get_type_sequence(field->type);
3241 WARN_ON_ONCE(!sequence_type);
f513b2bf 3242
437d5aa5 3243 length_name = sequence_type->length_name;
51ef4536
MD		 3244 if (!length_name)
3245 length_name = prev_field_name;
3246 if (!length_name)
3247 return -EINVAL;
ceabb767 3248
437d5aa5 3249 if (sequence_type->alignment) {
ceabb767 3250 ret = print_tabs(session, nesting);
f513b2bf
MD		 3251 if (ret)
3252 return ret;
ceabb767
MD		 3253 ret = lttng_metadata_printf(session,
3254 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3255 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3256 field->name);
3257 if (ret)
3258 return ret;
3259 }
3260
3261 /*
3262 * Nested compound types: Only array of structures and variants are
3263 * currently supported.
3264 */
437d5aa5 3265 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3266 switch (elem_type->type) {
3267 case lttng_kernel_type_integer:
437d5aa5
MD		 3268 case lttng_kernel_type_struct:
3269 case lttng_kernel_type_variant:
3270 ret = _lttng_type_statedump(session, elem_type,
3271 sequence_type->encoding, nesting);
65c85aa6
MD		 3272 if (ret)
3273 return ret;
3274 break;
ceabb767 3275
f513b2bf
MD		 3276 default:
3277 return -EINVAL;
3278 }
3279 ret = lttng_metadata_printf(session,
3280 " _%s[ _%s ];\n",
3281 field->name,
51ef4536 3282 length_name);
f513b2bf
MD		 3283 return ret;
3284}
3285
141ddf28
MD		 3286/*
3287 * Must be called with sessions_mutex held.
3288 */
3289static
ceabb767 3290int _lttng_enum_type_statedump(struct lttng_session *session,
437d5aa5 3291 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3292 size_t nesting)
3293{
d96a4a7a 3294 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3295 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3296 int ret;
3297 unsigned int i, nr_entries;
3298
437d5aa5 3299 container_type = type->container_type;
12bb2edb 3300 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3301 ret = -EINVAL;
3302 goto end;
3303 }
437d5aa5 3304 enum_desc = type->desc;
141ddf28
MD		 3305 nr_entries = enum_desc->nr_entries;
3306
3307 ret = print_tabs(session, nesting);
3308 if (ret)
3309 goto end;
ceabb767
MD		 3310 ret = lttng_metadata_printf(session, "enum : ");
3311 if (ret)
3312 goto end;
437d5aa5
MD		 3313 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3314 lttng_kernel_string_encoding_none, 0);
141ddf28 3315 if (ret)
ceabb767
MD		 3316 goto end;
3317 ret = lttng_metadata_printf(session, " {\n");
3318 if (ret)
3319 goto end;
141ddf28
MD		 3320 /* Dump all entries */
3321 for (i = 0; i < nr_entries; i++) {
437d5aa5 3322 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3323 int j, len;
3324
3325 ret = print_tabs(session, nesting + 1);
3326 if (ret)
3327 goto end;
3328 ret = lttng_metadata_printf(session,
3329 "\"");
3330 if (ret)
3331 goto end;
3332 len = strlen(entry->string);
3333 /* Escape the character '"' */
3334 for (j = 0; j < len; j++) {
3335 char c = entry->string[j];
3336
3337 switch (c) {
3338 case '"':
3339 ret = lttng_metadata_printf(session,
3340 "\\\"");
3341 break;
3342 case '\\':
3343 ret = lttng_metadata_printf(session,
3344 "\\\\");
3345 break;
3346 default:
3347 ret = lttng_metadata_printf(session,
3348 "%c", c);
3349 break;
3350 }
3351 if (ret)
3352 goto end;
3353 }
08ad1061
PP		 3354 ret = lttng_metadata_printf(session, "\"");
3355 if (ret)
3356 goto end;
3357
3358 if (entry->options.is_auto) {
3359 ret = lttng_metadata_printf(session, ",\n");
3360 if (ret)
3361 goto end;
141ddf28 3362 } else {
7c559490
MD		 3363 ret = lttng_metadata_printf(session,
3364 " = ");
3365 if (ret)
3366 goto end;
3367 if (entry->start.signedness)
141ddf28 3368 ret = lttng_metadata_printf(session,
7c559490
MD		 3369 "%lld", (long long) entry->start.value);
3370 else
3371 ret = lttng_metadata_printf(session,
3372 "%llu", entry->start.value);
3373 if (ret)
3374 goto end;
3375 if (entry->start.signedness == entry->end.signedness &&
3376 entry->start.value
3377 == entry->end.value) {
141ddf28 3378 ret = lttng_metadata_printf(session,
7c559490
MD		 3379 ",\n");
3380 } else {
3381 if (entry->end.signedness) {
3382 ret = lttng_metadata_printf(session,
3383 " ... %lld,\n",
3384 (long long) entry->end.value);
3385 } else {
3386 ret = lttng_metadata_printf(session,
3387 " ... %llu,\n",
3388 entry->end.value);
3389 }
141ddf28 3390 }
7c559490
MD		 3391 if (ret)
3392 goto end;
141ddf28 3393 }
141ddf28
MD		 3394 }
3395 ret = print_tabs(session, nesting);
3396 if (ret)
3397 goto end;
ceabb767 3398 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3399end:
3400 return ret;
3401}
3402
d83004aa
JD		 3403/*
3404 * Must be called with sessions_mutex held.
3405 */
c099397a 3406static
ceabb767 3407int _lttng_enum_field_statedump(struct lttng_session *session,
437d5aa5 3408 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3409 size_t nesting)
3410{
3411 int ret;
437d5aa5 3412 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3413
437d5aa5
MD		 3414 enum_type = lttng_kernel_get_type_enum(field->type);
3415 WARN_ON_ONCE(!enum_type);
3416 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3417 if (ret)
3418 return ret;
3419 return lttng_field_name_statedump(session, field, nesting);
3420}
3421
3422static
3423int _lttng_integer_field_statedump(struct lttng_session *session,
437d5aa5 3424 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3425 size_t nesting)
3426{
3427 int ret;
3428
437d5aa5
MD		 3429 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3430 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3431 if (ret)
3432 return ret;
3433 return lttng_field_name_statedump(session, field, nesting);
3434}
3435
3436static
3437int _lttng_string_type_statedump(struct lttng_session *session,
437d5aa5 3438 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3439 size_t nesting)
3440{
3441 int ret;
3442
ceabb767
MD		 3443 /* Default encoding is UTF8 */
3444 ret = print_tabs(session, nesting);
3445 if (ret)
3446 return ret;
3447 ret = lttng_metadata_printf(session,
3448 "string%s",
437d5aa5 3449 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3450 " { encoding = ASCII; }" : "");
3451 return ret;
3452}
3453
3454static
3455int _lttng_string_field_statedump(struct lttng_session *session,
437d5aa5 3456 const struct lttng_kernel_event_field *field,
f513b2bf 3457 size_t nesting)
ceabb767 3458{
437d5aa5 3459 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3460 int ret;
3461
437d5aa5
MD		 3462 string_type = lttng_kernel_get_type_string(field->type);
3463 WARN_ON_ONCE(!string_type);
3464 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3465 if (ret)
3466 return ret;
3467 return lttng_field_name_statedump(session, field, nesting);
3468}
3469
3470/*
3471 * Must be called with sessions_mutex held.
3472 */
3473static
3474int _lttng_type_statedump(struct lttng_session *session,
437d5aa5
MD		 3475 const struct lttng_kernel_type_common *type,
3476 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3477 size_t nesting)
c099397a 3478{
c099397a 3479 int ret = 0;
c099397a 3480
12bb2edb
MD		 3481 switch (type->type) {
3482 case lttng_kernel_type_integer:
437d5aa5
MD		 3483 ret = _lttng_integer_type_statedump(session,
3484 lttng_kernel_get_type_integer(type),
3485 parent_encoding, nesting);
8070f5c0 3486 break;
437d5aa5
MD		 3487 case lttng_kernel_type_enum:
3488 ret = _lttng_enum_type_statedump(session,
3489 lttng_kernel_get_type_enum(type),
3490 nesting);
8070f5c0 3491 break;
12bb2edb 3492 case lttng_kernel_type_string:
437d5aa5
MD		 3493 ret = _lttng_string_type_statedump(session,
3494 lttng_kernel_get_type_string(type),
3495 nesting);
ceabb767 3496 break;
437d5aa5
MD		 3497 case lttng_kernel_type_struct:
3498 ret = _lttng_struct_type_statedump(session,
3499 lttng_kernel_get_type_struct(type),
3500 nesting);
8070f5c0 3501 break;
437d5aa5
MD		 3502 case lttng_kernel_type_variant:
3503 ret = _lttng_variant_type_statedump(session,
3504 lttng_kernel_get_type_variant(type),
51ef4536 3505 nesting, NULL);
ceabb767
MD		 3506 break;
3507
3508 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3509 case lttng_kernel_type_array:
3510 case lttng_kernel_type_sequence:
ceabb767
MD		 3511 default:
3512 WARN_ON_ONCE(1);
3513 return -EINVAL;
8070f5c0 3514 }
ceabb767
MD		 3515 return ret;
3516}
8070f5c0 3517
ceabb767
MD		 3518/*
3519 * Must be called with sessions_mutex held.
3520 */
3521static
3522int _lttng_field_statedump(struct lttng_session *session,
437d5aa5 3523 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3524 size_t nesting,
3525 const char **prev_field_name_p)
ceabb767 3526{
51ef4536 3527 const char *prev_field_name = NULL;
ceabb767 3528 int ret = 0;
27d2368e 3529
51ef4536
MD		 3530 if (prev_field_name_p)
3531 prev_field_name = *prev_field_name_p;
437d5aa5 3532 switch (field->type->type) {
12bb2edb 3533 case lttng_kernel_type_integer:
ceabb767
MD		 3534 ret = _lttng_integer_field_statedump(session, field, nesting);
3535 break;
437d5aa5 3536 case lttng_kernel_type_enum:
ceabb767 3537 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3538 break;
12bb2edb 3539 case lttng_kernel_type_string:
ceabb767 3540 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3541 break;
437d5aa5 3542 case lttng_kernel_type_struct:
ceabb767 3543 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3544 break;
437d5aa5 3545 case lttng_kernel_type_array:
ceabb767 3546 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3547 break;
437d5aa5 3548 case lttng_kernel_type_sequence:
51ef4536 3549 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3550 break;
437d5aa5 3551 case lttng_kernel_type_variant:
51ef4536 3552 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3553 break;
f513b2bf 3554
8070f5c0
MD		 3555 default:
3556 WARN_ON_ONCE(1);
3557 return -EINVAL;
3558 }
51ef4536
MD		 3559 if (prev_field_name_p)
3560 *prev_field_name_p = field->name;
8070f5c0
MD		 3561 return ret;
3562}
3563
3564static
a90917c3 3565int _lttng_context_metadata_statedump(struct lttng_session *session,
437d5aa5 3566 struct lttng_kernel_ctx *ctx)
8070f5c0 3567{
51ef4536 3568 const char *prev_field_name = NULL;
8070f5c0
MD		 3569 int ret = 0;
3570 int i;
3571
3572 if (!ctx)
3573 return 0;
3574 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3575 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3576
51ef4536 3577 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3578 if (ret)
3579 return ret;
3580 }
3581 return ret;
3582}
3583
3584static
a90917c3 3585int _lttng_fields_metadata_statedump(struct lttng_session *session,
a67ba386 3586 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3587{
51ef4536 3588 const char *prev_field_name = NULL;
a67ba386 3589 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3590 int ret = 0;
3591 int i;
3592
3593 for (i = 0; i < desc->nr_fields; i++) {
437d5aa5 3594 const struct lttng_kernel_event_field *field = desc->fields[i];
8070f5c0 3595
51ef4536 3596 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3597 if (ret)
3598 return ret;
c099397a
MD		 3599 }
3600 return ret;
3601}
3602
d83004aa
JD		 3603/*
3604 * Must be called with sessions_mutex held.
8b97fd42
MD		 3605 * The entire event metadata is printed as a single atomic metadata
3606 * transaction.
d83004aa 3607 */
c099397a 3608static
a90917c3
MD		 3609int _lttng_event_metadata_statedump(struct lttng_session *session,
3610 struct lttng_channel *chan,
a67ba386 3611 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3612{
3613 int ret = 0;
3614
a67ba386 3615 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3616 return 0;
d83004aa 3617 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3618 return 0;
3619
8b97fd42
MD		 3620 lttng_metadata_begin(session);
3621
c099397a
MD		 3622 ret = lttng_metadata_printf(session,
3623 "event {\n"
ae734547 3624 " name = \"%s\";\n"
c099397a 3625 " id = %u;\n"
b9074a1b 3626 " stream_id = %u;\n",
a67ba386
MD		 3627 event_recorder->priv->parent.desc->event_name,
3628 event_recorder->priv->id,
3629 event_recorder->chan->id);
c099397a
MD		 3630 if (ret)
3631 goto end;
3632
8070f5c0 3633 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3634 " fields := struct {\n"
3635 );
3636 if (ret)
3637 goto end;
3638
a67ba386 3639 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3640 if (ret)
3641 goto end;
3642
3643 /*
3644 * LTTng space reservation can only reserve multiples of the
3645 * byte size.
3646 */
3647 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3648 " };\n"
3649 "};\n\n");
c099397a
MD		 3650 if (ret)
3651 goto end;
3652
a67ba386 3653 event_recorder->priv->metadata_dumped = 1;
c099397a 3654end:
8b97fd42 3655 lttng_metadata_end(session);
c099397a
MD		 3656 return ret;
3657
3658}
3659
d83004aa
JD		 3660/*
3661 * Must be called with sessions_mutex held.
8b97fd42
MD		 3662 * The entire channel metadata is printed as a single atomic metadata
3663 * transaction.
d83004aa 3664 */
c099397a 3665static
a90917c3
MD		 3666int _lttng_channel_metadata_statedump(struct lttng_session *session,
3667 struct lttng_channel *chan)
c099397a
MD		 3668{
3669 int ret = 0;
3670
585e5dcc 3671 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3672 return 0;
d83004aa
JD		 3673
3674 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3675 return 0;
3676
8b97fd42
MD		 3677 lttng_metadata_begin(session);
3678
c099397a
MD		 3679 WARN_ON_ONCE(!chan->header_type);
3680 ret = lttng_metadata_printf(session,
3681 "stream {\n"
3682 " id = %u;\n"
9115fbdc 3683 " event.header := %s;\n"
b9074a1b 3684 " packet.context := struct packet_context;\n",
c099397a
MD		 3685 chan->id,
3686 chan->header_type == 1 ? "struct event_header_compact" :
3687 "struct event_header_large");
3688 if (ret)
3689 goto end;
3690
b9074a1b
MD		 3691 if (chan->ctx) {
3692 ret = lttng_metadata_printf(session,
3693 " event.context := struct {\n");
3694 if (ret)
3695 goto end;
3696 }
a90917c3 3697 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 3698 if (ret)
3699 goto end;
b9074a1b
MD		 3700 if (chan->ctx) {
3701 ret = lttng_metadata_printf(session,
3702 " };\n");
3703 if (ret)
3704 goto end;
3705 }
8070f5c0
MD		 3706
3707 ret = lttng_metadata_printf(session,
b9074a1b 3708 "};\n\n");
8070f5c0 3709
c099397a
MD		 3710 chan->metadata_dumped = 1;
3711end:
8b97fd42 3712 lttng_metadata_end(session);
c099397a
MD		 3713 return ret;
3714}
3715
d83004aa
JD		 3716/*
3717 * Must be called with sessions_mutex held.
3718 */
9115fbdc 3719static
a90917c3 3720int _lttng_stream_packet_context_declare(struct lttng_session *session)
9115fbdc
MD		 3721{
3722 return lttng_metadata_printf(session,
3723 "struct packet_context {\n"
a3ccff4f
MD		 3724 " uint64_clock_monotonic_t timestamp_begin;\n"
3725 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3726 " uint64_t content_size;\n"
3727 " uint64_t packet_size;\n"
5b3cf4f9 3728 " uint64_t packet_seq_num;\n"
a9afe705 3729 " unsigned long events_discarded;\n"
9115fbdc 3730 " uint32_t cpu_id;\n"
c6dfdf6f 3731 "};\n\n"
9115fbdc
MD		 3732 );
3733}
3734
3735/*
3736 * Compact header:
3737 * id: range: 0 - 30.
3738 * id 31 is reserved to indicate an extended header.
3739 *
3740 * Large header:
3741 * id: range: 0 - 65534.
3742 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3743 *
3744 * Must be called with sessions_mutex held.
9115fbdc
MD		 3745 */
3746static
a90917c3 3747int _lttng_event_header_declare(struct lttng_session *session)
9115fbdc
MD		 3748{
3749 return lttng_metadata_printf(session,
3750 "struct event_header_compact {\n"
3751 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3752 " variant <id> {\n"
3753 " struct {\n"
a3ccff4f 3754 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3755 " } compact;\n"
3756 " struct {\n"
3757 " uint32_t id;\n"
a3ccff4f 3758 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3759 " } extended;\n"
3760 " } v;\n"
3761 "} align(%u);\n"
3762 "\n"
3763 "struct event_header_large {\n"
3764 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3765 " variant <id> {\n"
3766 " struct {\n"
a3ccff4f 3767 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3768 " } compact;\n"
3769 " struct {\n"
3770 " uint32_t id;\n"
a3ccff4f 3771 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3772 " } extended;\n"
3773 " } v;\n"
3774 "} align(%u);\n\n",
a90917c3
MD		 3775 lttng_alignof(uint32_t) * CHAR_BIT,
3776 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3777 );
3778}
3779
a3ccff4f
MD		 3780 /*
3781 * Approximation of NTP time of day to clock monotonic correlation,
3782 * taken at start of trace.
3783 * Yes, this is only an approximation. Yes, we can (and will) do better
3784 * in future versions.
5283350b
MD		 3785 * This function may return a negative offset. It may happen if the
3786 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3787 *
3788 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3789 * y2038 compliant.
a3ccff4f
MD		 3790 */
3791static
8967b2a3 3792int64_t measure_clock_offset(void)
a3ccff4f 3793{
dcb93448 3794 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3795 uint64_t tcf = trace_clock_freq();
dcb93448 3796 int64_t offset;
a3ccff4f 3797 unsigned long flags;
3636085f
MJ		 3798#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3799 struct timespec64 rts = { 0, 0 };
3800#else
3801 struct timespec rts = { 0, 0 };
3802#endif
a3ccff4f
MD		 3803
3804 /* Disable interrupts to increase correlation precision. */
3805 local_irq_save(flags);
3806 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3807#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3808 ktime_get_real_ts64(&rts);
3809#else
216b6baa 3810 getnstimeofday(&rts);
3636085f 3811#endif
a3ccff4f
MD		 3812 monotonic[1] = trace_clock_read64();
3813 local_irq_restore(flags);
3814
dcb93448 3815 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3816 realtime = (uint64_t) rts.tv_sec * tcf;
3817 if (tcf == NSEC_PER_SEC) {
3818 realtime += rts.tv_nsec;
3819 } else {
3820 uint64_t n = rts.tv_nsec * tcf;
3821
3822 do_div(n, NSEC_PER_SEC);
3823 realtime += n;
3824 }
dcb93448 3825 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3826 return offset;
3827}
3828
3eb95be4
JR		 3829static
3830int print_escaped_ctf_string(struct lttng_session *session, const char *string)
3831{
0f3eaad4 3832 int ret = 0;
3eb95be4
JR		 3833 size_t i;
3834 char cur;
3835
3836 i = 0;
3837 cur = string[i];
3838 while (cur != '\0') {
3839 switch (cur) {
3840 case '\n':
3841 ret = lttng_metadata_printf(session, "%s", "\\n");
3842 break;
3843 case '\\':
3844 case '"':
3845 ret = lttng_metadata_printf(session, "%c", '\\');
3846 if (ret)
3847 goto error;
3848 /* We still print the current char */
3849 /* Fallthrough */
3850 default:
3851 ret = lttng_metadata_printf(session, "%c", cur);
3852 break;
3853 }
3854
3855 if (ret)
3856 goto error;
3857
3858 cur = string[++i];
3859 }
3860error:
3861 return ret;
3862}
3863
3864static
1c88f269
JR		 3865int print_metadata_escaped_field(struct lttng_session *session, const char *field,
3866 const char *field_value)
3eb95be4
JR		 3867{
3868 int ret;
3869
1c88f269 3870 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3871 if (ret)
3872 goto error;
3873
1c88f269 3874 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3875 if (ret)
3876 goto error;
3877
3878 ret = lttng_metadata_printf(session, "\";\n");
3879
3880error:
3881 return ret;
3882}
3883
c099397a
MD		 3884/*
3885 * Output metadata into this session's metadata buffers.
d83004aa 3886 * Must be called with sessions_mutex held.
c099397a
MD		 3887 */
3888static
a90917c3 3889int _lttng_session_metadata_statedump(struct lttng_session *session)
c099397a 3890{
30bdb6e4 3891 unsigned char *uuid_c = session->uuid.b;
a82c63f1 3892 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3893 const char *product_uuid;
a90917c3 3894 struct lttng_channel *chan;
a67ba386 3895 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3896 int ret = 0;
3897
585e5dcc 3898 if (!LTTNG_READ_ONCE(session->active))
c099397a 3899 return 0;
8b97fd42
MD		 3900
3901 lttng_metadata_begin(session);
3902
c099397a
MD		 3903 if (session->metadata_dumped)
3904 goto skip_session;
c099397a 3905
d793d5e1 3906 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3907 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3908 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3909 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3910 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3911 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3912
3913 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3914 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3915 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3916 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3917 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3918 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3919 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3920 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3921 "\n"
3922 "trace {\n"
3923 " major = %u;\n"
3924 " minor = %u;\n"
30bdb6e4 3925 " uuid = \"%s\";\n"
d793d5e1
MD		 3926 " byte_order = %s;\n"
3927 " packet.header := struct {\n"
3928 " uint32_t magic;\n"
1ec3f75a 3929 " uint8_t uuid[16];\n"
d793d5e1 3930 " uint32_t stream_id;\n"
5594698f 3931 " uint64_t stream_instance_id;\n"
0eb25f58 3932 " };\n"
d793d5e1 3933 "};\n\n",
a90917c3
MD		 3934 lttng_alignof(uint8_t) * CHAR_BIT,
3935 lttng_alignof(uint16_t) * CHAR_BIT,
3936 lttng_alignof(uint32_t) * CHAR_BIT,
3937 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3938 sizeof(unsigned long) * CHAR_BIT,
3939 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3940 CTF_SPEC_MAJOR,
3941 CTF_SPEC_MINOR,
d793d5e1 3942 uuid_s,
5214fa50 3943#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3944 "be"
3945#else
3946 "le"
3947#endif
3948 );
3949 if (ret)
3950 goto end;
3951
99dc9597
MD		 3952 ret = lttng_metadata_printf(session,
3953 "env {\n"
a6058143 3954 " hostname = \"%s\";\n"
c6c9e10f 3955 " domain = \"kernel\";\n"
99dc9597 3956 " sysname = \"%s\";\n"
c6c9e10f
MD		 3957 " kernel_release = \"%s\";\n"
3958 " kernel_version = \"%s\";\n"
3959 " tracer_name = \"lttng-modules\";\n"
3960 " tracer_major = %d;\n"
3961 " tracer_minor = %d;\n"
3962 " tracer_patchlevel = %d;\n"
3eb95be4 3963 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3964 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3965 utsname()->sysname,
3966 utsname()->release,
c6c9e10f
MD		 3967 utsname()->version,
3968 LTTNG_MODULES_MAJOR_VERSION,
3969 LTTNG_MODULES_MINOR_VERSION,
3970 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3971 );
3972 if (ret)
3973 goto end;
3974
1c88f269
JR		 3975 ret = print_metadata_escaped_field(session, "trace_name", session->name);
3976 if (ret)
3977 goto end;
3978 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
3979 session->creation_time);
3eb95be4
JR		 3980 if (ret)
3981 goto end;
3982
c88f762e
GB		 3983 /* Add the product UUID to the 'env' section */
3984 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3985 if (product_uuid) {
3986 ret = lttng_metadata_printf(session,
3987 " product_uuid = \"%s\";\n",
3988 product_uuid
3989 );
3990 if (ret)
3991 goto end;
3992 }
3993
3994 /* Close the 'env' section */
3eb95be4
JR		 3995 ret = lttng_metadata_printf(session, "};\n\n");
3996 if (ret)
3997 goto end;
3998
a3ccff4f
MD		 3999 ret = lttng_metadata_printf(session,
4000 "clock {\n"
2754583e
MD		 4001 " name = \"%s\";\n",
4002 trace_clock_name()
a82c63f1
MD		 4003 );
4004 if (ret)
4005 goto end;
4006
4007 if (!trace_clock_uuid(clock_uuid_s)) {
4008 ret = lttng_metadata_printf(session,
7c27cb17 4009 " uuid = \"%s\";\n",
a82c63f1
MD		 4010 clock_uuid_s
4011 );
4012 if (ret)
4013 goto end;
4014 }
4015
4016 ret = lttng_metadata_printf(session,
2754583e 4017 " description = \"%s\";\n"
a3ccff4f
MD		 4018 " freq = %llu; /* Frequency, in Hz */\n"
4019 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4020 " offset = %lld;\n"
a3ccff4f 4021 "};\n\n",
2754583e 4022 trace_clock_description(),
a3ccff4f 4023 (unsigned long long) trace_clock_freq(),
8967b2a3 4024 (long long) measure_clock_offset()
a3ccff4f
MD		 4025 );
4026 if (ret)
4027 goto end;
4028
4029 ret = lttng_metadata_printf(session,
4030 "typealias integer {\n"
4031 " size = 27; align = 1; signed = false;\n"
2754583e 4032 " map = clock.%s.value;\n"
a3ccff4f
MD		 4033 "} := uint27_clock_monotonic_t;\n"
4034 "\n"
4035 "typealias integer {\n"
4036 " size = 32; align = %u; signed = false;\n"
2754583e 4037 " map = clock.%s.value;\n"
a3ccff4f
MD		 4038 "} := uint32_clock_monotonic_t;\n"
4039 "\n"
4040 "typealias integer {\n"
4041 " size = 64; align = %u; signed = false;\n"
2754583e 4042 " map = clock.%s.value;\n"
a3ccff4f 4043 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4044 trace_clock_name(),
a3ccff4f 4045 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4046 trace_clock_name(),
4047 lttng_alignof(uint64_t) * CHAR_BIT,
4048 trace_clock_name()
a3ccff4f
MD		 4049 );
4050 if (ret)
4051 goto end;
4052
a90917c3 4053 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4054 if (ret)
4055 goto end;
4056
a90917c3 4057 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4058 if (ret)
4059 goto end;
4060
c099397a
MD		 4061skip_session:
4062 list_for_each_entry(chan, &session->chan, list) {
a90917c3 4063 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 4064 if (ret)
4065 goto end;
4066 }
4067
a67ba386
MD		 4068 list_for_each_entry(event_recorder_priv, &session->events, node) {
4069 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4070 event_recorder_priv->pub);
c099397a
MD		 4071 if (ret)
4072 goto end;
4073 }
4074 session->metadata_dumped = 1;
4075end:
8b97fd42 4076 lttng_metadata_end(session);
c099397a
MD		 4077 return ret;
4078}
4079
c0e31d2e 4080/**
a90917c3 4081 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4082 * @transport: transport structure
4083 *
4084 * Registers a transport which can be used as output to extract the data out of
4085 * LTTng. The module calling this registration function must ensure that no
4086 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4087 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4088 * is made visible to the transport function. This registration acts as a
263b6c88 4089 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4090 * after its registration must it synchronize the TLBs.
4091 */
a90917c3 4092void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4093{
4094 /*
4095 * Make sure no page fault can be triggered by the module about to be
4096 * registered. We deal with this here so we don't have to call
263b6c88 4097 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4098 */
263b6c88 4099 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4100
4101 mutex_lock(&sessions_mutex);
a90917c3 4102 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4103 mutex_unlock(&sessions_mutex);
4104}
a90917c3 4105EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4106
4107/**
a90917c3 4108 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4109 * @transport: transport structure
4110 */
a90917c3 4111void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4112{
4113 mutex_lock(&sessions_mutex);
4114 list_del(&transport->node);
4115 mutex_unlock(&sessions_mutex);
4116}
a90917c3 4117EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4118
a101fa10
MD		 4119void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4120{
4121 /*
4122 * Make sure no page fault can be triggered by the module about to be
4123 * registered. We deal with this here so we don't have to call
4124 * vmalloc_sync_mappings() in each module's init.
4125 */
4126 wrapper_vmalloc_sync_mappings();
4127
4128 mutex_lock(&sessions_mutex);
4129 list_add_tail(&transport->node, &lttng_counter_transport_list);
4130 mutex_unlock(&sessions_mutex);
4131}
4132EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4133
4134void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4135{
4136 mutex_lock(&sessions_mutex);
4137 list_del(&transport->node);
4138 mutex_unlock(&sessions_mutex);
4139}
4140EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4141
5f4c791e 4142#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4143
4144enum cpuhp_state lttng_hp_prepare;
4145enum cpuhp_state lttng_hp_online;
4146
4147static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4148{
4149 struct lttng_cpuhp_node *lttng_node;
4150
4151 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4152 switch (lttng_node->component) {
4153 case LTTNG_RING_BUFFER_FRONTEND:
4154 return 0;
4155 case LTTNG_RING_BUFFER_BACKEND:
4156 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4157 case LTTNG_RING_BUFFER_ITER:
4158 return 0;
4159 case LTTNG_CONTEXT_PERF_COUNTERS:
4160 return 0;
4161 default:
4162 return -EINVAL;
4163 }
4164}
4165
4166static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4167{
4168 struct lttng_cpuhp_node *lttng_node;
4169
4170 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4171 switch (lttng_node->component) {
4172 case LTTNG_RING_BUFFER_FRONTEND:
4173 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4174 case LTTNG_RING_BUFFER_BACKEND:
4175 return 0;
4176 case LTTNG_RING_BUFFER_ITER:
4177 return 0;
4178 case LTTNG_CONTEXT_PERF_COUNTERS:
4179 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4180 default:
4181 return -EINVAL;
4182 }
4183}
4184
4185static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4186{
4187 struct lttng_cpuhp_node *lttng_node;
4188
4189 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4190 switch (lttng_node->component) {
4191 case LTTNG_RING_BUFFER_FRONTEND:
4192 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4193 case LTTNG_RING_BUFFER_BACKEND:
4194 return 0;
4195 case LTTNG_RING_BUFFER_ITER:
4196 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4197 case LTTNG_CONTEXT_PERF_COUNTERS:
4198 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4199 default:
4200 return -EINVAL;
4201 }
4202}
4203
4204static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4205{
4206 struct lttng_cpuhp_node *lttng_node;
4207
4208 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4209 switch (lttng_node->component) {
4210 case LTTNG_RING_BUFFER_FRONTEND:
4211 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4212 case LTTNG_RING_BUFFER_BACKEND:
4213 return 0;
4214 case LTTNG_RING_BUFFER_ITER:
4215 return 0;
4216 case LTTNG_CONTEXT_PERF_COUNTERS:
4217 return 0;
4218 default:
4219 return -EINVAL;
4220 }
4221}
4222
4223static int __init lttng_init_cpu_hotplug(void)
4224{
4225 int ret;
4226
4227 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4228 lttng_hotplug_prepare,
4229 lttng_hotplug_dead);
4230 if (ret < 0) {
4231 return ret;
4232 }
4233 lttng_hp_prepare = ret;
4234 lttng_rb_set_hp_prepare(ret);
4235
4236 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4237 lttng_hotplug_online,
4238 lttng_hotplug_offline);
4239 if (ret < 0) {
4240 cpuhp_remove_multi_state(lttng_hp_prepare);
4241 lttng_hp_prepare = 0;
4242 return ret;
4243 }
4244 lttng_hp_online = ret;
4245 lttng_rb_set_hp_online(ret);
4246
4247 return 0;
4248}
4249
4250static void __exit lttng_exit_cpu_hotplug(void)
4251{
4252 lttng_rb_set_hp_online(0);
4253 cpuhp_remove_multi_state(lttng_hp_online);
4254 lttng_rb_set_hp_prepare(0);
4255 cpuhp_remove_multi_state(lttng_hp_prepare);
4256}
4257
5f4c791e 4258#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4259static int lttng_init_cpu_hotplug(void)
4260{
4261 return 0;
4262}
4263static void lttng_exit_cpu_hotplug(void)
4264{
4265}
5f4c791e 4266#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4267
4268
a90917c3 4269static int __init lttng_events_init(void)
4e3c1b9b 4270{
1c25284c
MD		 4271 int ret;
4272
453b2495
JD		 4273 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4274 if (ret)
4275 return ret;
389d7070 4276 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4277 if (ret)
4278 return ret;
4279 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4280 if (ret)
4281 return ret;
4282 ret = lttng_probes_init();
389d7070
MD		 4283 if (ret)
4284 return ret;
07dfc1d0 4285 ret = lttng_context_init();
20591cf7
MD		 4286 if (ret)
4287 return ret;
07dfc1d0
MD		 4288 ret = lttng_tracepoint_init();
4289 if (ret)
4290 goto error_tp;
a67ba386
MD		 4291 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4292 if (!event_recorder_cache) {
20591cf7 4293 ret = -ENOMEM;
a67ba386 4294 goto error_kmem_event_recorder;
dffef45d 4295 }
a67ba386
MD		 4296 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4297 if (!event_recorder_private_cache) {
4298 ret = -ENOMEM;
4299 goto error_kmem_event_recorder_private;
4300 }
4301 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4302 if (!event_notifier_cache) {
4303 ret = -ENOMEM;
4304 goto error_kmem_event_notifier;
20591cf7 4305 }
a67ba386
MD		 4306 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4307 if (!event_notifier_private_cache) {
4308 ret = -ENOMEM;
4309 goto error_kmem_event_notifier_private;
4310 }
80996790 4311 ret = lttng_abi_init();
02119ee5
MD		 4312 if (ret)
4313 goto error_abi;
0c956676
MD		 4314 ret = lttng_logger_init();
4315 if (ret)
4316 goto error_logger;
1e367326
MD		 4317 ret = lttng_init_cpu_hotplug();
4318 if (ret)
4319 goto error_hotplug;
101215b7 4320 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4321 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4322 __stringify(LTTNG_MODULES_MINOR_VERSION),
4323 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4324 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4325 LTTNG_VERSION_NAME,
4326#ifdef LTTNG_EXTRA_VERSION_GIT
4327 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4328#else
4329 "",
4330#endif
4331#ifdef LTTNG_EXTRA_VERSION_NAME
4332 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4333#else
4334 "");
4335#endif
4e3c1b9b 4336 return 0;
0c956676 4337
1e367326
MD		 4338error_hotplug:
4339 lttng_logger_exit();
0c956676
MD		 4340error_logger:
4341 lttng_abi_exit();
02119ee5 4342error_abi:
a67ba386
MD		 4343 kmem_cache_destroy(event_notifier_private_cache);
4344error_kmem_event_notifier_private:
dffef45d
FD		 4345 kmem_cache_destroy(event_notifier_cache);
4346error_kmem_event_notifier:
a67ba386
MD		 4347 kmem_cache_destroy(event_recorder_private_cache);
4348error_kmem_event_recorder_private:
4349 kmem_cache_destroy(event_recorder_cache);
4350error_kmem_event_recorder:
20591cf7 4351 lttng_tracepoint_exit();
07dfc1d0
MD		 4352error_tp:
4353 lttng_context_exit();
101215b7 4354 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4355 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4356 __stringify(LTTNG_MODULES_MINOR_VERSION),
4357 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4358 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4359 LTTNG_VERSION_NAME,
4360#ifdef LTTNG_EXTRA_VERSION_GIT
4361 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4362#else
4363 "",
4364#endif
4365#ifdef LTTNG_EXTRA_VERSION_NAME
4366 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4367#else
4368 "");
4369#endif
1c25284c 4370 return ret;
4e3c1b9b
MD		 4371}
4372
a90917c3 4373module_init(lttng_events_init);
11b5a3c2 4374
a90917c3 4375static void __exit lttng_events_exit(void)
4e3c1b9b 4376{
a90917c3 4377 struct lttng_session *session, *tmpsession;
92e94819 4378
1e367326 4379 lttng_exit_cpu_hotplug();
0c956676 4380 lttng_logger_exit();
80996790 4381 lttng_abi_exit();
92e94819 4382 list_for_each_entry_safe(session, tmpsession, &sessions, list)
a90917c3 4383 lttng_session_destroy(session);
a67ba386
MD		 4384 kmem_cache_destroy(event_recorder_cache);
4385 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4386 kmem_cache_destroy(event_notifier_cache);
a67ba386 4387 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4388 lttng_tracepoint_exit();
07dfc1d0 4389 lttng_context_exit();
101215b7 4390 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4391 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4392 __stringify(LTTNG_MODULES_MINOR_VERSION),
4393 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4394 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4395 LTTNG_VERSION_NAME,
4396#ifdef LTTNG_EXTRA_VERSION_GIT
4397 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4398#else
4399 "",
4400#endif
4401#ifdef LTTNG_EXTRA_VERSION_NAME
4402 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4403#else
4404 "");
4405#endif
4e3c1b9b 4406}
92e94819 4407
a90917c3 4408module_exit(lttng_events_exit);
11b5a3c2 4409
7ca11e77 4410#include <generated/patches.h>
101215b7
MJ		 4411#ifdef LTTNG_EXTRA_VERSION_GIT
4412MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4413#endif
4414#ifdef LTTNG_EXTRA_VERSION_NAME
4415MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4416#endif
92e94819
MD		 4417MODULE_LICENSE("GPL and additional rights");
4418MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4419MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4420MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4421 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4422 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4423 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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