projects / lttng-modules.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Refactoring: event structures
[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
a67ba386
MD		 72static void _lttng_event_destroy(struct lttng_kernel_event_recorder *event);
73static void _lttng_event_notifier_destroy(struct lttng_kernel_event_notifier *event_notifier);
a90917c3 74static void _lttng_channel_destroy(struct lttng_channel *chan);
a67ba386
MD		 75static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event);
76static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier);
c099397a 77static
a90917c3
MD		 78int _lttng_event_metadata_statedump(struct lttng_session *session,
79 struct lttng_channel *chan,
a67ba386 80 struct lttng_kernel_event_recorder *event);
c099397a 81static
a90917c3 82int _lttng_session_metadata_statedump(struct lttng_session *session);
d83004aa
JD		 83static
84void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 85static
ceabb767 86int _lttng_type_statedump(struct lttng_session *session,
437d5aa5
MD		 87 const struct lttng_kernel_type_common *type,
88 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 89 size_t nesting);
90static
f513b2bf 91int _lttng_field_statedump(struct lttng_session *session,
437d5aa5 92 const struct lttng_kernel_event_field *field,
f513b2bf 93 size_t nesting);
c099397a 94
c099397a 95void synchronize_trace(void)
abcca994 96{
5f4c791e 97#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
92da05ce
MJ		 98 synchronize_rcu();
99#else
abcca994 100 synchronize_sched();
92da05ce
MJ		 101#endif
102
5f4c791e 103#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 104#ifdef CONFIG_PREEMPT_RT_FULL
105 synchronize_rcu();
106#endif
5f4c791e 107#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 108#ifdef CONFIG_PREEMPT_RT
109 synchronize_rcu();
110#endif
5f4c791e 111#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 112}
113
3c997079
MD		 114void lttng_lock_sessions(void)
115{
116 mutex_lock(&sessions_mutex);
117}
118
119void lttng_unlock_sessions(void)
120{
121 mutex_unlock(&sessions_mutex);
122}
123
9fe593d2
FD		 124static struct lttng_transport *lttng_transport_find(const char *name)
125{
126 struct lttng_transport *transport;
127
128 list_for_each_entry(transport, &lttng_transport_list, node) {
129 if (!strcmp(transport->name, name))
130 return transport;
131 }
132 return NULL;
133}
134
3c997079
MD		 135/*
136 * Called with sessions lock held.
137 */
138int lttng_session_active(void)
139{
140 struct lttng_session *iter;
141
142 list_for_each_entry(iter, &sessions, list) {
143 if (iter->active)
144 return 1;
145 }
146 return 0;
147}
148
a90917c3 149struct lttng_session *lttng_session_create(void)
4e3c1b9b 150{
a90917c3 151 struct lttng_session *session;
d83004aa 152 struct lttng_metadata_cache *metadata_cache;
3c997079 153 int i;
4e3c1b9b
MD		 154
155 mutex_lock(&sessions_mutex);
48f5e0b5 156 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
4e3c1b9b 157 if (!session)
d83004aa 158 goto err;
4e3c1b9b 159 INIT_LIST_HEAD(&session->chan);
f3d01b96 160 INIT_LIST_HEAD(&session->events);
a7008254 161 lttng_guid_gen(&session->uuid);
d83004aa
JD		 162
163 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
164 GFP_KERNEL);
165 if (!metadata_cache)
166 goto err_free_session;
0ca42eb7 167 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 168 if (!metadata_cache->data)
169 goto err_free_cache;
170 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
171 kref_init(&metadata_cache->refcount);
92d9f5e6 172 mutex_init(&metadata_cache->lock);
d83004aa
JD		 173 session->metadata_cache = metadata_cache;
174 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
a36580d5
MD		 175 memcpy(&metadata_cache->uuid, &session->uuid,
176 sizeof(metadata_cache->uuid));
3c997079
MD		 177 INIT_LIST_HEAD(&session->enablers_head);
178 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
179 INIT_HLIST_HEAD(&session->events_ht.table[i]);
4e3c1b9b 180 list_add(&session->list, &sessions);
d1f652f8
MD		 181 session->pid_tracker.session = session;
182 session->pid_tracker.tracker_type = TRACKER_PID;
183 session->vpid_tracker.session = session;
184 session->vpid_tracker.tracker_type = TRACKER_VPID;
185 session->uid_tracker.session = session;
186 session->uid_tracker.tracker_type = TRACKER_UID;
187 session->vuid_tracker.session = session;
188 session->vuid_tracker.tracker_type = TRACKER_VUID;
189 session->gid_tracker.session = session;
190 session->gid_tracker.tracker_type = TRACKER_GID;
191 session->vgid_tracker.session = session;
192 session->vgid_tracker.tracker_type = TRACKER_VGID;
4e3c1b9b
MD		 193 mutex_unlock(&sessions_mutex);
194 return session;
d83004aa
JD		 195
196err_free_cache:
197 kfree(metadata_cache);
198err_free_session:
48f5e0b5 199 lttng_kvfree(session);
d83004aa
JD		 200err:
201 mutex_unlock(&sessions_mutex);
202 return NULL;
203}
204
99f52fcc
FD		 205static
206struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
207{
208 struct lttng_counter_transport *transport;
209
210 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
211 if (!strcmp(transport->name, name))
212 return transport;
213 }
214 return NULL;
215}
216
217struct lttng_counter *lttng_kernel_counter_create(
218 const char *counter_transport_name,
219 size_t number_dimensions, const size_t *dimensions_sizes)
220{
221 struct lttng_counter *counter = NULL;
222 struct lttng_counter_transport *counter_transport = NULL;
223
224 counter_transport = lttng_counter_transport_find(counter_transport_name);
225 if (!counter_transport) {
226 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
227 counter_transport_name);
228 goto notransport;
229 }
230 if (!try_module_get(counter_transport->owner)) {
231 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
232 goto notransport;
233 }
234
235 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
236 if (!counter)
237 goto nomem;
238
239 /* Create event notifier error counter. */
240 counter->ops = &counter_transport->ops;
241 counter->transport = counter_transport;
242
243 counter->counter = counter->ops->counter_create(
244 number_dimensions, dimensions_sizes, 0);
245 if (!counter->counter) {
246 goto create_error;
247 }
248
249 return counter;
250
251create_error:
252 lttng_kvfree(counter);
253nomem:
254 if (counter_transport)
255 module_put(counter_transport->owner);
256notransport:
257 return NULL;
258}
259
750b05f2
FD		 260struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
261{
262 struct lttng_transport *transport = NULL;
263 struct lttng_event_notifier_group *event_notifier_group;
264 const char *transport_name = "relay-event-notifier";
265 size_t subbuf_size = 4096; //TODO
266 size_t num_subbuf = 16; //TODO
267 unsigned int switch_timer_interval = 0;
268 unsigned int read_timer_interval = 0;
dffef45d 269 int i;
750b05f2
FD		 270
271 mutex_lock(&sessions_mutex);
272
273 transport = lttng_transport_find(transport_name);
274 if (!transport) {
275 printk(KERN_WARNING "LTTng: transport %s not found\n",
276 transport_name);
277 goto notransport;
278 }
279 if (!try_module_get(transport->owner)) {
280 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
281 transport_name);
282 goto notransport;
283 }
284
285 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
286 GFP_KERNEL);
287 if (!event_notifier_group)
288 goto nomem;
289
290 /*
291 * Initialize the ring buffer used to store event notifier
292 * notifications.
293 */
294 event_notifier_group->ops = &transport->ops;
295 event_notifier_group->chan = transport->ops.channel_create(
296 transport_name, event_notifier_group, NULL,
297 subbuf_size, num_subbuf, switch_timer_interval,
298 read_timer_interval);
299 if (!event_notifier_group->chan)
300 goto create_error;
301
302 event_notifier_group->transport = transport;
dffef45d
FD		 303
304 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
305 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
306 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
307 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
308
750b05f2
FD		 309 list_add(&event_notifier_group->node, &event_notifier_groups);
310
311 mutex_unlock(&sessions_mutex);
312
313 return event_notifier_group;
314
315create_error:
316 lttng_kvfree(event_notifier_group);
317nomem:
318 if (transport)
319 module_put(transport->owner);
320notransport:
321 mutex_unlock(&sessions_mutex);
322 return NULL;
323}
324
d83004aa
JD		 325void metadata_cache_destroy(struct kref *kref)
326{
327 struct lttng_metadata_cache *cache =
328 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 329 vfree(cache->data);
d83004aa 330 kfree(cache);
4e3c1b9b
MD		 331}
332
a90917c3 333void lttng_session_destroy(struct lttng_session *session)
4e3c1b9b 334{
a90917c3 335 struct lttng_channel *chan, *tmpchan;
a67ba386 336 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 337 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 338 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 339 int ret;
4e3c1b9b
MD		 340
341 mutex_lock(&sessions_mutex);
a8f2d0c7 342 WRITE_ONCE(session->active, 0);
1ec65de1 343 list_for_each_entry(chan, &session->chan, list) {
3b82c4e1 344 ret = lttng_syscalls_unregister_channel(chan);
1ec65de1
MD		 345 WARN_ON(ret);
346 }
a67ba386
MD		 347 list_for_each_entry(event_recorder_priv, &session->events, node) {
348 ret = _lttng_event_unregister(event_recorder_priv->pub);
dda6a249
MD		 349 WARN_ON(ret);
350 }
abcca994 351 synchronize_trace(); /* Wait for in-flight events to complete */
badfe9f5 352 list_for_each_entry(chan, &session->chan, list) {
2d6d88c6 353 ret = lttng_syscalls_destroy_event(chan);
badfe9f5
MD		 354 WARN_ON(ret);
355 }
b2bc0bc8 356 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
3c997079 357 &session->enablers_head, node)
b2bc0bc8 358 lttng_event_enabler_destroy(event_enabler);
a67ba386
MD		 359 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->events, node)
360 _lttng_event_destroy(event_recorder_priv->pub);
d83004aa
JD		 361 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
362 BUG_ON(chan->channel_type == METADATA_CHANNEL);
a90917c3 363 _lttng_channel_destroy(chan);
d83004aa 364 }
ab036a63 365 mutex_lock(&session->metadata_cache->lock);
d83004aa
JD		 366 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
367 _lttng_metadata_channel_hangup(metadata_stream);
ab036a63 368 mutex_unlock(&session->metadata_cache->lock);
d1f652f8
MD		 369 lttng_id_tracker_destroy(&session->pid_tracker, false);
370 lttng_id_tracker_destroy(&session->vpid_tracker, false);
371 lttng_id_tracker_destroy(&session->uid_tracker, false);
372 lttng_id_tracker_destroy(&session->vuid_tracker, false);
373 lttng_id_tracker_destroy(&session->gid_tracker, false);
374 lttng_id_tracker_destroy(&session->vgid_tracker, false);
d83004aa 375 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
4e3c1b9b
MD		 376 list_del(&session->list);
377 mutex_unlock(&sessions_mutex);
48f5e0b5 378 lttng_kvfree(session);
4e3c1b9b
MD		 379}
380
dffef45d
FD		 381void lttng_event_notifier_group_destroy(
382 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 383{
dffef45d 384 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
a67ba386 385 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 386 int ret;
387
750b05f2
FD		 388 if (!event_notifier_group)
389 return;
390
391 mutex_lock(&sessions_mutex);
dffef45d 392
3b82c4e1 393 ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group);
8a8ac9a8
FD		 394 WARN_ON(ret);
395
a67ba386
MD		 396 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
397 &event_notifier_group->event_notifiers_head, node) {
398 ret = _lttng_event_notifier_unregister(event_notifier_priv->pub);
dffef45d
FD		 399 WARN_ON(ret);
400 }
401
b01155ba
FD		 402 /* Wait for in-flight event notifier to complete */
403 synchronize_trace();
404
21f58fb7
FD		 405 irq_work_sync(&event_notifier_group->wakeup_pending);
406
8a8ac9a8
FD		 407 kfree(event_notifier_group->sc_filter);
408
dffef45d
FD		 409 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
410 &event_notifier_group->enablers_head, node)
411 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
412
a67ba386
MD		 413 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
414 &event_notifier_group->event_notifiers_head, node)
415 _lttng_event_notifier_destroy(event_notifier_priv->pub);
dffef45d 416
99f52fcc
FD		 417 if (event_notifier_group->error_counter) {
418 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 419
99f52fcc
FD		 420 error_counter->ops->counter_destroy(error_counter->counter);
421 module_put(error_counter->transport->owner);
422 lttng_kvfree(error_counter);
423 event_notifier_group->error_counter = NULL;
424 }
425
750b05f2
FD		 426 event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
427 module_put(event_notifier_group->transport->owner);
428 list_del(&event_notifier_group->node);
dffef45d 429
750b05f2
FD		 430 mutex_unlock(&sessions_mutex);
431 lttng_kvfree(event_notifier_group);
432}
433
601252cf
MD		 434int lttng_session_statedump(struct lttng_session *session)
435{
436 int ret;
437
438 mutex_lock(&sessions_mutex);
439 ret = lttng_statedump_start(session);
440 mutex_unlock(&sessions_mutex);
441 return ret;
442}
443
a90917c3 444int lttng_session_enable(struct lttng_session *session)
c0e31d2e
MD		 445{
446 int ret = 0;
a90917c3 447 struct lttng_channel *chan;
c0e31d2e
MD		 448
449 mutex_lock(&sessions_mutex);
450 if (session->active) {
451 ret = -EBUSY;
452 goto end;
453 }
c099397a 454
3c997079
MD		 455 /* Set transient enabler state to "enabled" */
456 session->tstate = 1;
457
4ef81e4a 458 /* We need to sync enablers with session before activation. */
b2bc0bc8 459 lttng_session_sync_event_enablers(session);
4ef81e4a 460
c099397a
MD		 461 /*
462 * Snapshot the number of events per channel to know the type of header
463 * we need to use.
464 */
465 list_for_each_entry(chan, &session->chan, list) {
466 if (chan->header_type)
467 continue; /* don't change it if session stop/restart */
468 if (chan->free_event_id < 31)
469 chan->header_type = 1; /* compact */
470 else
471 chan->header_type = 2; /* large */
472 }
473
64af2437 474 /* Clear each stream's quiescent state. */
09b93db9
MD		 475 list_for_each_entry(chan, &session->chan, list) {
476 if (chan->channel_type != METADATA_CHANNEL)
477 lib_ring_buffer_clear_quiescent_channel(chan->chan);
478 }
64af2437 479
a8f2d0c7
MJ		 480 WRITE_ONCE(session->active, 1);
481 WRITE_ONCE(session->been_active, 1);
a90917c3 482 ret = _lttng_session_metadata_statedump(session);
c337ddc2 483 if (ret) {
a8f2d0c7 484 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 485 goto end;
486 }
487 ret = lttng_statedump_start(session);
360f38ea 488 if (ret)
a8f2d0c7 489 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 490end:
491 mutex_unlock(&sessions_mutex);
11b5a3c2 492 return ret;
c0e31d2e
MD		 493}
494
a90917c3 495int lttng_session_disable(struct lttng_session *session)
c0e31d2e
MD		 496{
497 int ret = 0;
64af2437 498 struct lttng_channel *chan;
c0e31d2e
MD		 499
500 mutex_lock(&sessions_mutex);
501 if (!session->active) {
502 ret = -EBUSY;
503 goto end;
504 }
a8f2d0c7 505 WRITE_ONCE(session->active, 0);
3c997079
MD		 506
507 /* Set transient enabler state to "disabled" */
508 session->tstate = 0;
b2bc0bc8 509 lttng_session_sync_event_enablers(session);
64af2437
MD		 510
511 /* Set each stream's quiescent state. */
09b93db9
MD		 512 list_for_each_entry(chan, &session->chan, list) {
513 if (chan->channel_type != METADATA_CHANNEL)
514 lib_ring_buffer_set_quiescent_channel(chan->chan);
515 }
c0e31d2e
MD		 516end:
517 mutex_unlock(&sessions_mutex);
11b5a3c2 518 return ret;
c0e31d2e
MD		 519}
520
9616f0bf
JD		 521int lttng_session_metadata_regenerate(struct lttng_session *session)
522{
523 int ret = 0;
524 struct lttng_channel *chan;
a67ba386 525 struct lttng_kernel_event_recorder_private *event_recorder_priv;
9616f0bf
JD		 526 struct lttng_metadata_cache *cache = session->metadata_cache;
527 struct lttng_metadata_stream *stream;
528
529 mutex_lock(&sessions_mutex);
530 if (!session->active) {
531 ret = -EBUSY;
532 goto end;
533 }
534
535 mutex_lock(&cache->lock);
536 memset(cache->data, 0, cache->cache_alloc);
537 cache->metadata_written = 0;
538 cache->version++;
539 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
540 stream->metadata_out = 0;
541 stream->metadata_in = 0;
542 }
543 mutex_unlock(&cache->lock);
544
545 session->metadata_dumped = 0;
546 list_for_each_entry(chan, &session->chan, list) {
547 chan->metadata_dumped = 0;
548 }
549
a67ba386
MD		 550 list_for_each_entry(event_recorder_priv, &session->events, node) {
551 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 552 }
553
554 ret = _lttng_session_metadata_statedump(session);
555
556end:
557 mutex_unlock(&sessions_mutex);
558 return ret;
559}
560
a90917c3 561int lttng_channel_enable(struct lttng_channel *channel)
e64957da 562{
3c997079 563 int ret = 0;
e64957da 564
3c997079
MD		 565 mutex_lock(&sessions_mutex);
566 if (channel->channel_type == METADATA_CHANNEL) {
567 ret = -EPERM;
568 goto end;
569 }
570 if (channel->enabled) {
571 ret = -EEXIST;
572 goto end;
573 }
574 /* Set transient enabler state to "enabled" */
575 channel->tstate = 1;
b2bc0bc8 576 lttng_session_sync_event_enablers(channel->session);
3c997079 577 /* Set atomically the state to "enabled" */
a8f2d0c7 578 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 579end:
580 mutex_unlock(&sessions_mutex);
581 return ret;
e64957da
MD		 582}
583
a90917c3 584int lttng_channel_disable(struct lttng_channel *channel)
e64957da 585{
3c997079 586 int ret = 0;
e64957da 587
3c997079
MD		 588 mutex_lock(&sessions_mutex);
589 if (channel->channel_type == METADATA_CHANNEL) {
590 ret = -EPERM;
591 goto end;
592 }
593 if (!channel->enabled) {
594 ret = -EEXIST;
595 goto end;
596 }
597 /* Set atomically the state to "disabled" */
a8f2d0c7 598 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 599 /* Set transient enabler state to "enabled" */
600 channel->tstate = 0;
b2bc0bc8 601 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 602end:
603 mutex_unlock(&sessions_mutex);
604 return ret;
e64957da
MD		 605}
606
a67ba386 607int lttng_event_enable(struct lttng_kernel_event_recorder *event_recorder)
e64957da 608{
a67ba386 609 struct lttng_kernel_event_common *event = &event_recorder->parent;
3c997079 610 int ret = 0;
e64957da 611
3c997079 612 mutex_lock(&sessions_mutex);
a67ba386 613 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
3c997079
MD		 614 ret = -EPERM;
615 goto end;
616 }
617 if (event->enabled) {
618 ret = -EEXIST;
619 goto end;
620 }
a67ba386 621 switch (event->priv->instrumentation) {
606828e4
MD		 622 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
623 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 624 ret = -EINVAL;
625 break;
b4a75708 626
606828e4
MD		 627 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
628 case LTTNG_KERNEL_ABI_UPROBE:
a8f2d0c7 629 WRITE_ONCE(event->enabled, 1);
a0493bef 630 break;
b4a75708 631
606828e4 632 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 633 ret = lttng_kretprobes_event_enable_state(event_recorder, 1);
a0493bef 634 break;
b4a75708 635
606828e4
MD		 636 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
637 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 638 default:
639 WARN_ON_ONCE(1);
640 ret = -EINVAL;
641 }
3c997079
MD		 642end:
643 mutex_unlock(&sessions_mutex);
644 return ret;
e64957da
MD		 645}
646
a67ba386 647int lttng_event_disable(struct lttng_kernel_event_recorder *event_recorder)
e64957da 648{
a67ba386 649 struct lttng_kernel_event_common *event = &event_recorder->parent;
3c997079 650 int ret = 0;
e64957da 651
3c997079 652 mutex_lock(&sessions_mutex);
a67ba386 653 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
3c997079
MD		 654 ret = -EPERM;
655 goto end;
656 }
657 if (!event->enabled) {
658 ret = -EEXIST;
659 goto end;
660 }
a67ba386 661 switch (event->priv->instrumentation) {
606828e4
MD		 662 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
663 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 664 ret = -EINVAL;
665 break;
b4a75708 666
606828e4
MD		 667 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
668 case LTTNG_KERNEL_ABI_UPROBE:
a8f2d0c7 669 WRITE_ONCE(event->enabled, 0);
a0493bef 670 break;
b4a75708 671
606828e4 672 case LTTNG_KERNEL_ABI_KRETPROBE:
b4a75708 673
a67ba386 674 ret = lttng_kretprobes_event_enable_state(event_recorder, 0);
a0493bef 675 break;
b4a75708 676
606828e4
MD		 677 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
678 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 679 default:
680 WARN_ON_ONCE(1);
681 ret = -EINVAL;
682 }
3c997079
MD		 683end:
684 mutex_unlock(&sessions_mutex);
685 return ret;
e64957da
MD		 686}
687
a67ba386 688int lttng_event_notifier_enable(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 689{
a67ba386 690 struct lttng_kernel_event_common *event = &event_notifier->parent;
dffef45d
FD		 691 int ret = 0;
692
693 mutex_lock(&sessions_mutex);
a67ba386 694 if (event->enabled) {
dffef45d
FD		 695 ret = -EEXIST;
696 goto end;
697 }
a67ba386 698 switch (event->priv->instrumentation) {
606828e4
MD		 699 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
700 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 701 ret = -EINVAL;
702 break;
b4a75708 703
606828e4
MD		 704 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
705 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 706 WRITE_ONCE(event->enabled, 1);
2b16f0c9 707 break;
b4a75708 708
606828e4
MD		 709 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
710 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
711 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 712 default:
713 WARN_ON_ONCE(1);
714 ret = -EINVAL;
715 }
716end:
717 mutex_unlock(&sessions_mutex);
718 return ret;
719}
720
a67ba386 721int lttng_event_notifier_disable(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 722{
a67ba386 723 struct lttng_kernel_event_common *event = &event_notifier->parent;
dffef45d
FD		 724 int ret = 0;
725
726 mutex_lock(&sessions_mutex);
a67ba386 727 if (!event->enabled) {
dffef45d
FD		 728 ret = -EEXIST;
729 goto end;
730 }
a67ba386 731 switch (event->priv->instrumentation) {
606828e4
MD		 732 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
733 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 734 ret = -EINVAL;
735 break;
b4a75708 736
606828e4
MD		 737 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
738 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 739 WRITE_ONCE(event->enabled, 0);
2b16f0c9 740 break;
b4a75708 741
606828e4
MD		 742 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
743 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
744 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 745 default:
746 WARN_ON_ONCE(1);
747 ret = -EINVAL;
748 }
749end:
750 mutex_unlock(&sessions_mutex);
751 return ret;
752}
753
a90917c3 754struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 755 const char *transport_name,
756 void *buf_addr,
4e3c1b9b
MD		 757 size_t subbuf_size, size_t num_subbuf,
758 unsigned int switch_timer_interval,
d83004aa
JD		 759 unsigned int read_timer_interval,
760 enum channel_type channel_type)
4e3c1b9b 761{
a90917c3
MD		 762 struct lttng_channel *chan;
763 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 764
765 mutex_lock(&sessions_mutex);
d83004aa 766 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 767 goto active; /* Refuse to add channel to active session */
a90917c3 768 transport = lttng_transport_find(transport_name);
f3d01b96 769 if (!transport) {
5a15f70c 770 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 771 transport_name);
c0e31d2e 772 goto notransport;
f3d01b96 773 }
a33c9927 774 if (!try_module_get(transport->owner)) {
5a15f70c 775 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 776 goto notransport;
777 }
a90917c3 778 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 779 if (!chan)
c0e31d2e 780 goto nomem;
4e3c1b9b 781 chan->session = session;
05d32c64 782 chan->id = session->free_chan_id++;
3b731ab1 783 chan->ops = &transport->ops;
125b4df4
MD		 784 /*
785 * Note: the channel creation op already writes into the packet
786 * headers. Therefore the "chan" information used as input
787 * should be already accessible.
788 */
5f5ddf01
MD		 789 chan->chan = transport->ops.channel_create(transport_name,
790 chan, buf_addr, subbuf_size, num_subbuf,
791 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 792 if (!chan->chan)
793 goto create_error;
3c997079 794 chan->tstate = 1;
e64957da 795 chan->enabled = 1;
a33c9927 796 chan->transport = transport;
d83004aa 797 chan->channel_type = channel_type;
4e3c1b9b
MD		 798 list_add(&chan->list, &session->chan);
799 mutex_unlock(&sessions_mutex);
800 return chan;
801
f3d01b96
MD		 802create_error:
803 kfree(chan);
c0e31d2e 804nomem:
a33c9927
MD		 805 if (transport)
806 module_put(transport->owner);
c0e31d2e 807notransport:
e5382b6d 808active:
4e3c1b9b
MD		 809 mutex_unlock(&sessions_mutex);
810 return NULL;
811}
812
813/*
d83004aa
JD		 814 * Only used internally at session destruction for per-cpu channels, and
815 * when metadata channel is released.
816 * Needs to be called with sessions mutex held.
4e3c1b9b 817 */
aa7c23a9 818static
a90917c3 819void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 820{
11b5a3c2 821 chan->ops->channel_destroy(chan->chan);
a33c9927 822 module_put(chan->transport->owner);
4e3c1b9b 823 list_del(&chan->list);
437d5aa5 824 lttng_kernel_destroy_context(chan->ctx);
4e3c1b9b
MD		 825 kfree(chan);
826}
827
d83004aa
JD		 828void lttng_metadata_channel_destroy(struct lttng_channel *chan)
829{
830 BUG_ON(chan->channel_type != METADATA_CHANNEL);
831
832 /* Protect the metadata cache with the sessions_mutex. */
833 mutex_lock(&sessions_mutex);
834 _lttng_channel_destroy(chan);
835 mutex_unlock(&sessions_mutex);
836}
837EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
838
839static
840void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
841{
842 stream->finalized = 1;
843 wake_up_interruptible(&stream->read_wait);
844}
845
a101fa10 846
e5382b6d
MD		 847/*
848 * Supports event creation while tracing session is active.
3c997079 849 * Needs to be called with sessions mutex held.
e5382b6d 850 */
a67ba386 851struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 852 struct lttng_kernel_abi_event *event_param,
437d5aa5 853 const struct lttng_kernel_event_desc *event_desc,
606828e4 854 enum lttng_kernel_abi_instrumentation itype)
4e3c1b9b 855{
3c997079 856 struct lttng_session *session = chan->session;
a67ba386
MD		 857 struct lttng_kernel_event_recorder *event_recorder;
858 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 859 const char *event_name;
860 struct hlist_head *head;
3d084699 861 int ret;
4e3c1b9b 862
abc0446a 863 if (chan->free_event_id == -1U) {
4cf0bf51 864 ret = -EMFILE;
e5382b6d 865 goto full;
abc0446a 866 }
3c997079
MD		 867
868 switch (itype) {
606828e4 869 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 870 event_name = event_desc->event_name;
3c997079 871 break;
b4a75708 872
606828e4
MD		 873 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
874 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
875 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
876 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 877 event_name = event_param->name;
878 break;
b4a75708 879
606828e4
MD		 880 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
881 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
3c997079
MD		 882 default:
883 WARN_ON_ONCE(1);
884 ret = -EINVAL;
885 goto type_error;
886 }
4a11ef1c
FD		 887
888 head = utils_borrow_hash_table_bucket(session->events_ht.table,
889 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 890 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
891 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
892 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 893 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 894 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 895 ret = -EEXIST;
896 goto exist;
abc0446a
MD		 897 }
898 }
3c997079 899
a67ba386
MD		 900 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
901 if (!event_recorder) {
4cf0bf51 902 ret = -ENOMEM;
4e3c1b9b 903 goto cache_error;
abc0446a 904 }
a67ba386
MD		 905 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
906 if (!event_recorder_priv) {
907 ret = -ENOMEM;
908 goto cache_private_error;
909 }
910 event_recorder_priv->pub = event_recorder;
911 event_recorder_priv->parent.pub = &event_recorder->parent;
912 event_recorder->priv = event_recorder_priv;
913 event_recorder->parent.priv = &event_recorder_priv->parent;
914 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
915
916 event_recorder->chan = chan;
917 event_recorder->priv->id = chan->free_event_id++;
918 event_recorder->priv->parent.instrumentation = itype;
919 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
920 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 921
922 switch (itype) {
606828e4 923 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 924 /* Event will be enabled by enabler sync. */
a67ba386
MD		 925 event_recorder->parent.enabled = 0;
926 event_recorder->priv->parent.registered = 0;
927 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
928 if (!event_recorder->priv->parent.desc) {
4cf0bf51 929 ret = -ENOENT;
d3dbe23c 930 goto register_error;
abc0446a 931 }
3c997079
MD		 932 /* Populate lttng_event structure before event registration. */
933 smp_wmb();
baf20995 934 break;
b4a75708 935
606828e4 936 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 937 /*
938 * Needs to be explicitly enabled after creation, since
939 * we may want to apply filters.
940 */
a67ba386
MD		 941 event_recorder->parent.enabled = 0;
942 event_recorder->priv->parent.registered = 1;
3c997079
MD		 943 /*
944 * Populate lttng_event structure before event
945 * registration.
946 */
947 smp_wmb();
8bf17deb 948 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 949 event_param->u.kprobe.symbol_name,
950 event_param->u.kprobe.offset,
951 event_param->u.kprobe.addr,
a67ba386 952 event_recorder);
abc0446a 953 if (ret) {
4cf0bf51 954 ret = -EINVAL;
d6d808f3 955 goto register_error;
abc0446a 956 }
a67ba386 957 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 958 WARN_ON_ONCE(!ret);
d6d808f3 959 break;
b4a75708 960
606828e4 961 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 962 {
a67ba386
MD		 963 struct lttng_kernel_event_recorder *event_recorder_return;
964 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 965
966 /* kretprobe defines 2 events */
a0493bef
MD		 967 /*
968 * Needs to be explicitly enabled after creation, since
969 * we may want to apply filters.
970 */
a67ba386
MD		 971 event_recorder->parent.enabled = 0;
972 event_recorder->priv->parent.registered = 1;
973
974 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
975 if (!event_recorder_return) {
976 ret = -ENOMEM;
977 goto register_error;
978 }
979 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
980 if (!event_recorder_return_priv) {
981 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 982 ret = -ENOMEM;
7371f44c 983 goto register_error;
abc0446a 984 }
a67ba386
MD		 985 event_recorder_return_priv->pub = event_recorder_return;
986 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
987 event_recorder_return->priv = event_recorder_return_priv;
988 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
989 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
990
991 event_recorder_return->chan = chan;
992 event_recorder_return->priv->id = chan->free_event_id++;
993 event_recorder_return->priv->parent.instrumentation = itype;
994 event_recorder_return->parent.enabled = 0;
995 event_recorder_return->priv->parent.registered = 1;
996 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
997 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 998 /*
a90917c3 999 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1000 */
1001 smp_wmb();
3c997079 1002 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1003 event_param->u.kretprobe.symbol_name,
1004 event_param->u.kretprobe.offset,
1005 event_param->u.kretprobe.addr,
a67ba386 1006 event_recorder, event_recorder_return);
7371f44c 1007 if (ret) {
a67ba386
MD		 1008 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1009 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1010 ret = -EINVAL;
7371f44c
MD		 1011 goto register_error;
1012 }
1013 /* Take 2 refs on the module: one per event. */
a67ba386 1014 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1015 WARN_ON_ONCE(!ret);
a67ba386 1016 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1017 WARN_ON_ONCE(!ret);
a90917c3 1018 ret = _lttng_event_metadata_statedump(chan->session, chan,
a67ba386 1019 event_recorder_return);
abc0446a 1020 WARN_ON_ONCE(ret > 0);
7371f44c 1021 if (ret) {
a67ba386
MD		 1022 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1023 kmem_cache_free(event_recorder_cache, event_recorder_return);
1024 module_put(event_recorder_return->priv->parent.desc->owner);
1025 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1026 goto statedump_error;
1027 }
a67ba386 1028 list_add(&event_recorder_return->priv->node, &chan->session->events);
7371f44c
MD		 1029 break;
1030 }
b4a75708 1031
606828e4 1032 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1033 /*
1034 * Needs to be explicitly enabled after creation, since
1035 * we may want to apply filters.
1036 */
a67ba386
MD		 1037 event_recorder->parent.enabled = 0;
1038 event_recorder->priv->parent.registered = 0;
1039 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1040 switch (event_param->u.syscall.entryexit) {
606828e4 1041 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1042 ret = -EINVAL;
1043 goto register_error;
606828e4 1044 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1045 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1046 break;
606828e4 1047 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1048 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1049 break;
1050 }
1051 switch (event_param->u.syscall.abi) {
606828e4 1052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1053 ret = -EINVAL;
1054 goto register_error;
606828e4 1055 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1056 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1057 break;
606828e4 1058 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1059 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1060 break;
1061 }
a67ba386 1062 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1063 ret = -EINVAL;
259b6cb3 1064 goto register_error;
abc0446a 1065 }
1ec65de1 1066 break;
b4a75708 1067
606828e4 1068 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1069 /*
1070 * Needs to be explicitly enabled after creation, since
1071 * we may want to apply filters.
1072 */
a67ba386
MD		 1073 event_recorder->parent.enabled = 0;
1074 event_recorder->priv->parent.registered = 1;
3aed4dca 1075
a344f64b
FD		 1076 /*
1077 * Populate lttng_event structure before event
1078 * registration.
1079 */
1080 smp_wmb();
149b9a9d 1081
83b802dc 1082 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1083 event_param->u.uprobe.fd,
a67ba386 1084 event_recorder);
149b9a9d
YB		 1085 if (ret)
1086 goto register_error;
a67ba386 1087 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1088 WARN_ON_ONCE(!ret);
1089 break;
b4a75708 1090
606828e4
MD		 1091 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1092 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
baf20995
MD		 1093 default:
1094 WARN_ON_ONCE(1);
4cf0bf51 1095 ret = -EINVAL;
df07930b 1096 goto register_error;
baf20995 1097 }
a67ba386 1098 ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder);
abc0446a
MD		 1099 WARN_ON_ONCE(ret > 0);
1100 if (ret) {
c099397a 1101 goto statedump_error;
abc0446a 1102 }
a67ba386
MD		 1103 hlist_add_head(&event_recorder->priv->hlist, head);
1104 list_add(&event_recorder->priv->node, &chan->session->events);
1105 return event_recorder;
4e3c1b9b 1106
c099397a 1107statedump_error:
259b6cb3 1108 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1109register_error:
a67ba386
MD		 1110 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1111cache_private_error:
1112 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1113cache_error:
1114exist:
3c997079 1115type_error:
e5382b6d 1116full:
4cf0bf51 1117 return ERR_PTR(ret);
4e3c1b9b
MD		 1118}
1119
a67ba386 1120struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1121 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1122 uint64_t token, uint64_t error_counter_index,
1123 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1124 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1125 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1126{
a67ba386
MD		 1127 struct lttng_kernel_event_notifier *event_notifier;
1128 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1129 struct lttng_counter *error_counter;
dffef45d
FD		 1130 const char *event_name;
1131 struct hlist_head *head;
1132 int ret;
1133
1134 switch (itype) {
606828e4 1135 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1136 event_name = event_desc->event_name;
b01155ba 1137 break;
b4a75708 1138
606828e4
MD		 1139 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1140 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1141 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1142 event_name = event_notifier_param->event.name;
1143 break;
b4a75708 1144
606828e4
MD		 1145 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1146 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1147 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1148 default:
1149 WARN_ON_ONCE(1);
1150 ret = -EINVAL;
1151 goto type_error;
1152 }
1153
1154 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1155 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1156 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1157 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1158 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1159 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1160 && event_notifier_group == event_notifier_priv->group
1161 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1162 ret = -EEXIST;
1163 goto exist;
1164 }
1165 }
1166
1167 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1168 if (!event_notifier) {
1169 ret = -ENOMEM;
1170 goto cache_error;
1171 }
a67ba386
MD		 1172 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1173 if (!event_notifier_priv) {
1174 ret = -ENOMEM;
1175 goto cache_private_error;
1176 }
1177 event_notifier_priv->pub = event_notifier;
1178 event_notifier_priv->parent.pub = &event_notifier->parent;
1179 event_notifier->priv = event_notifier_priv;
1180 event_notifier->parent.priv = &event_notifier_priv->parent;
1181 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1182
1183 event_notifier->priv->group = event_notifier_group;
1184 event_notifier->priv->parent.user_token = token;
1185 event_notifier->priv->error_counter_index = error_counter_index;
1186 event_notifier->priv->num_captures = 0;
1187 event_notifier->priv->parent.instrumentation = itype;
1188 event_notifier->notification_send = lttng_event_notifier_notification_send;
1189 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1190 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1191 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
dffef45d
FD		 1192
1193 switch (itype) {
606828e4 1194 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1195 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1196 event_notifier->parent.enabled = 0;
1197 event_notifier->priv->parent.registered = 0;
1198 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1199 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1200 ret = -ENOENT;
1201 goto register_error;
1202 }
1203 /* Populate lttng_event_notifier structure before event registration. */
1204 smp_wmb();
1205 break;
b4a75708 1206
606828e4 1207 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
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 = 1;
2b16f0c9
FD		 1214 /*
1215 * Populate lttng_event_notifier structure before event
1216 * registration.
1217 */
1218 smp_wmb();
1219 ret = lttng_kprobes_register_event_notifier(
1220 event_notifier_param->event.u.kprobe.symbol_name,
1221 event_notifier_param->event.u.kprobe.offset,
1222 event_notifier_param->event.u.kprobe.addr,
1223 event_notifier);
1224 if (ret) {
1225 ret = -EINVAL;
1226 goto register_error;
1227 }
a67ba386 1228 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1229 WARN_ON_ONCE(!ret);
1230 break;
b4a75708 1231
606828e4 1232 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1233 /*
1234 * Needs to be explicitly enabled after creation, since
1235 * we may want to apply filters.
1236 */
a67ba386
MD		 1237 event_notifier->parent.enabled = 0;
1238 event_notifier->priv->parent.registered = 0;
1239 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1240 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1241 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1242 ret = -EINVAL;
1243 goto register_error;
606828e4 1244 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1245 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1246 break;
606828e4 1247 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1248 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1249 break;
1250 }
1251 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1252 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1253 ret = -EINVAL;
1254 goto register_error;
606828e4 1255 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1256 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1257 break;
606828e4 1258 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1259 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1260 break;
1261 }
1262
a67ba386 1263 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1264 ret = -EINVAL;
1265 goto register_error;
1266 }
1267 break;
b4a75708 1268
606828e4 1269 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1270 /*
1271 * Needs to be explicitly enabled after creation, since
1272 * we may want to apply filters.
1273 */
a67ba386
MD		 1274 event_notifier->parent.enabled = 0;
1275 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1276
1277 /*
1278 * Populate lttng_event_notifier structure before
1279 * event_notifier registration.
1280 */
1281 smp_wmb();
1282
1283 ret = lttng_uprobes_register_event_notifier(
1284 event_notifier_param->event.name,
1285 event_notifier_param->event.u.uprobe.fd,
1286 event_notifier);
1287 if (ret)
1288 goto register_error;
a67ba386 1289 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1290 WARN_ON_ONCE(!ret);
1291 break;
b4a75708 1292
606828e4
MD		 1293 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1294 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1295 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1296 default:
1297 WARN_ON_ONCE(1);
1298 ret = -EINVAL;
1299 goto register_error;
1300 }
1301
a67ba386
MD		 1302 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1303 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1304
1305 /*
1306 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1307 * bucket is currently in use. We trust it. The session lock
1308 * synchronizes against concurrent creation of the error
1309 * counter.
99f52fcc 1310 */
ab04d7b1
MD		 1311 error_counter = event_notifier_group->error_counter;
1312 if (error_counter) {
99f52fcc
FD		 1313 size_t dimension_index[1];
1314
1315 /*
1316 * Check that the index is within the boundary of the counter.
1317 */
a67ba386 1318 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1319 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1320 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1321 ret = -EINVAL;
1322 goto register_error;
1323 }
1324
a67ba386 1325 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1326 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1327 if (ret) {
1328 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1329 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1330 goto register_error;
1331 }
1332 }
1333
dffef45d
FD		 1334 return event_notifier;
1335
1336register_error:
a67ba386
MD		 1337 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1338cache_private_error:
dffef45d
FD		 1339 kmem_cache_free(event_notifier_cache, event_notifier);
1340cache_error:
1341exist:
1342type_error:
1343 return ERR_PTR(ret);
1344}
1345
99f52fcc
FD		 1346int lttng_kernel_counter_read(struct lttng_counter *counter,
1347 const size_t *dim_indexes, int32_t cpu,
1348 int64_t *val, bool *overflow, bool *underflow)
1349{
1350 return counter->ops->counter_read(counter->counter, dim_indexes,
1351 cpu, val, overflow, underflow);
1352}
1353
1354int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1355 const size_t *dim_indexes, int64_t *val,
1356 bool *overflow, bool *underflow)
1357{
1358 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1359 val, overflow, underflow);
1360}
1361
1362int lttng_kernel_counter_clear(struct lttng_counter *counter,
1363 const size_t *dim_indexes)
1364{
1365 return counter->ops->counter_clear(counter->counter, dim_indexes);
1366}
1367
a67ba386 1368struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 1369 struct lttng_kernel_abi_event *event_param,
437d5aa5 1370 const struct lttng_kernel_event_desc *event_desc,
606828e4 1371 enum lttng_kernel_abi_instrumentation itype)
3c997079 1372{
a67ba386 1373 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1374
1375 mutex_lock(&sessions_mutex);
a67ba386 1376 event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype);
3c997079
MD		 1377 mutex_unlock(&sessions_mutex);
1378 return event;
1379}
1380
a67ba386 1381struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1382 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1383 uint64_t id, uint64_t error_counter_index,
1384 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1385 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1386 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1387{
a67ba386 1388 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1389
1390 mutex_lock(&sessions_mutex);
1391 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1392 error_counter_index, event_notifier_group,
a67ba386 1393 event_notifier_param, itype);
dffef45d
FD		 1394 mutex_unlock(&sessions_mutex);
1395 return event_notifier;
1396}
1397
3c997079
MD		 1398/* Only used for tracepoints for now. */
1399static
a67ba386 1400void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1401{
437d5aa5 1402 const struct lttng_kernel_event_desc *desc;
f127e61e 1403 int ret = -EINVAL;
3c997079 1404
a67ba386 1405 if (event_recorder->priv->parent.registered)
3c997079 1406 return;
4ecb5ad5 1407
a67ba386
MD		 1408 desc = event_recorder->priv->parent.desc;
1409 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1410 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1411 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
4ecb5ad5 1412 desc->probe_callback,
a67ba386 1413 event_recorder);
4ecb5ad5 1414 break;
b4a75708 1415
606828e4 1416 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1417 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1418 break;
b4a75708 1419
606828e4
MD		 1420 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1421 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1422 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1423 ret = 0;
1424 break;
b4a75708 1425
606828e4
MD		 1426 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1427 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
4ecb5ad5
MD		 1428 default:
1429 WARN_ON_ONCE(1);
1430 }
3c997079 1431 if (!ret)
a67ba386 1432 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1433}
1434
4e3c1b9b
MD		 1435/*
1436 * Only used internally at session destruction.
1437 */
a67ba386 1438int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1439{
a67ba386 1440 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1441 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1442 int ret = -EINVAL;
1443
a67ba386 1444 if (!event_priv->registered)
3c997079
MD		 1445 return 0;
1446
a67ba386
MD		 1447 desc = event_priv->desc;
1448 switch (event_priv->instrumentation) {
606828e4 1449 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386
MD		 1450 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
1451 event_priv->desc->probe_callback,
1452 event_recorder);
baf20995 1453 break;
b4a75708 1454
606828e4 1455 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1456 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1457 ret = 0;
1458 break;
b4a75708 1459
606828e4 1460 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1461 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1462 ret = 0;
1463 break;
b4a75708 1464
606828e4 1465 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1466 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1467 break;
b4a75708 1468
606828e4 1469 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1470 ret = 0;
1471 break;
b4a75708 1472
606828e4 1473 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1474 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1475 ret = 0;
1476 break;
b4a75708 1477
606828e4 1478 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
baf20995
MD		 1479 default:
1480 WARN_ON_ONCE(1);
1481 }
3c997079 1482 if (!ret)
a67ba386 1483 event_priv->registered = 0;
dda6a249
MD		 1484 return ret;
1485}
1486
dffef45d
FD		 1487/* Only used for tracepoints for now. */
1488static
a67ba386 1489void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1490{
437d5aa5 1491 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1492 int ret = -EINVAL;
1493
a67ba386 1494 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1495 return;
1496
a67ba386
MD		 1497 desc = event_notifier->priv->parent.desc;
1498 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1499 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1500 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
b01155ba
FD		 1501 desc->event_notifier_callback,
1502 event_notifier);
1503 break;
b4a75708 1504
606828e4 1505 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1506 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1507 break;
b4a75708 1508
606828e4
MD		 1509 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1510 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1511 ret = 0;
1512 break;
b4a75708 1513
606828e4
MD		 1514 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1515 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1516 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1517 default:
1518 WARN_ON_ONCE(1);
1519 }
1520 if (!ret)
a67ba386 1521 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1522}
1523
1524static
1525int _lttng_event_notifier_unregister(
a67ba386 1526 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1527{
437d5aa5 1528 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1529 int ret = -EINVAL;
1530
a67ba386 1531 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1532 return 0;
1533
a67ba386
MD		 1534 desc = event_notifier->priv->parent.desc;
1535 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1536 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386
MD		 1537 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
1538 event_notifier->priv->parent.desc->event_notifier_callback,
b01155ba
FD		 1539 event_notifier);
1540 break;
b4a75708 1541
606828e4 1542 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1543 lttng_kprobes_unregister_event_notifier(event_notifier);
1544 ret = 0;
1545 break;
b4a75708 1546
606828e4 1547 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1548 lttng_uprobes_unregister_event_notifier(event_notifier);
1549 ret = 0;
1550 break;
b4a75708 1551
606828e4 1552 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1553 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1554 break;
b4a75708 1555
606828e4
MD		 1556 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1557 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1558 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1559 default:
1560 WARN_ON_ONCE(1);
1561 }
1562 if (!ret)
a67ba386 1563 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1564 return ret;
1565}
1566
dda6a249
MD		 1567/*
1568 * Only used internally at session destruction.
1569 */
be066e6c 1570static
a67ba386 1571void _lttng_event_destroy(struct lttng_kernel_event_recorder *event_recorder)
dda6a249 1572{
a67ba386 1573 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
966ad253
MD		 1574 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1575
a67ba386 1576 switch (event_priv->instrumentation) {
606828e4 1577 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1578 lttng_event_desc_put(event_priv->desc);
edeb3137 1579 break;
b4a75708 1580
606828e4 1581 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386
MD		 1582 module_put(event_priv->desc->owner);
1583 lttng_kprobes_destroy_event_private(event_recorder);
edeb3137 1584 break;
b4a75708 1585
606828e4 1586 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386
MD		 1587 module_put(event_priv->desc->owner);
1588 lttng_kretprobes_destroy_private(event_recorder);
7371f44c 1589 break;
b4a75708 1590
606828e4 1591 case LTTNG_KERNEL_ABI_SYSCALL:
259b6cb3 1592 break;
b4a75708 1593
606828e4 1594 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386
MD		 1595 module_put(event_priv->desc->owner);
1596 lttng_uprobes_destroy_event_private(event_recorder);
149b9a9d 1597 break;
b4a75708 1598
606828e4
MD		 1599 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1600 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
edeb3137
MD		 1601 default:
1602 WARN_ON_ONCE(1);
1603 }
a67ba386
MD		 1604 list_del(&event_recorder->priv->node);
1605 lttng_free_event_filter_runtime(event_recorder);
966ad253
MD		 1606 /* Free event enabler refs */
1607 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
a67ba386 1608 &event_priv->enablers_ref_head, node)
966ad253 1609 kfree(enabler_ref);
a67ba386
MD		 1610 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1611 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1612}
1613
dffef45d
FD		 1614/*
1615 * Only used internally at session destruction.
1616 */
1617static
a67ba386 1618void _lttng_event_notifier_destroy(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1619{
3ef5cc03
MD		 1620 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1621
a67ba386 1622 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1623 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1624 lttng_event_desc_put(event_notifier->priv->parent.desc);
b01155ba 1625 break;
b4a75708 1626
606828e4 1627 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1628 module_put(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1629 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1630 break;
b4a75708 1631
606828e4 1632 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8 1633 break;
b4a75708 1634
606828e4 1635 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1636 module_put(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1637 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1638 break;
b4a75708 1639
606828e4
MD		 1640 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1641 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1642 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1643 default:
1644 WARN_ON_ONCE(1);
1645 }
a67ba386 1646 list_del(&event_notifier->priv->node);
3ef5cc03
MD		 1647 lttng_free_event_notifier_filter_runtime(event_notifier);
1648 /* Free event enabler refs */
1649 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
a67ba386 1650 &event_notifier->priv->parent.enablers_ref_head, node)
3ef5cc03 1651 kfree(enabler_ref);
a67ba386 1652 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
dffef45d
FD		 1653 kmem_cache_free(event_notifier_cache, event_notifier);
1654}
1655
d1f652f8
MD		 1656struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1657 enum tracker_type tracker_type)
e0130fab 1658{
d1f652f8
MD		 1659 switch (tracker_type) {
1660 case TRACKER_PID:
1661 return &session->pid_tracker;
1662 case TRACKER_VPID:
1663 return &session->vpid_tracker;
1664 case TRACKER_UID:
1665 return &session->uid_tracker;
1666 case TRACKER_VUID:
1667 return &session->vuid_tracker;
1668 case TRACKER_GID:
1669 return &session->gid_tracker;
1670 case TRACKER_VGID:
1671 return &session->vgid_tracker;
1672 default:
1673 WARN_ON_ONCE(1);
1674 return NULL;
1675 }
1676}
1677
1678int lttng_session_track_id(struct lttng_session *session,
1679 enum tracker_type tracker_type, int id)
1680{
1681 struct lttng_id_tracker *tracker;
e0130fab
MD		 1682 int ret;
1683
d1f652f8
MD		 1684 tracker = get_tracker(session, tracker_type);
1685 if (!tracker)
1686 return -EINVAL;
1687 if (id < -1)
e0130fab
MD		 1688 return -EINVAL;
1689 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1690 if (id == -1) {
1691 /* track all ids: destroy tracker. */
1692 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1693 ret = 0;
1694 } else {
d1f652f8 1695 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1696 }
e0130fab
MD		 1697 mutex_unlock(&sessions_mutex);
1698 return ret;
1699}
1700
d1f652f8
MD		 1701int lttng_session_untrack_id(struct lttng_session *session,
1702 enum tracker_type tracker_type, int id)
e0130fab 1703{
d1f652f8 1704 struct lttng_id_tracker *tracker;
e0130fab
MD		 1705 int ret;
1706
d1f652f8
MD		 1707 tracker = get_tracker(session, tracker_type);
1708 if (!tracker)
1709 return -EINVAL;
1710 if (id < -1)
e0130fab
MD		 1711 return -EINVAL;
1712 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1713 if (id == -1) {
1714 /* untrack all ids: replace by empty tracker. */
1715 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1716 } else {
d1f652f8 1717 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1718 }
e0130fab
MD		 1719 mutex_unlock(&sessions_mutex);
1720 return ret;
1721}
1722
7e6f9ef6 1723static
d1f652f8 1724void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1725{
d1f652f8
MD		 1726 struct lttng_id_tracker *id_tracker = m->private;
1727 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1728 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1729 int iter = 0, i;
1730
1731 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1732 if (id_tracker_p) {
1733 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1734 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1735
f934e302 1736 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1737 if (iter++ >= *pos)
1738 return e;
1739 }
1740 }
1741 } else {
d1f652f8 1742 /* ID tracker disabled. */
7e6f9ef6 1743 if (iter >= *pos && iter == 0) {
d1f652f8 1744 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1745 }
1746 iter++;
1747 }
1748 /* End of list */
1749 return NULL;
1750}
1751
1752/* Called with sessions_mutex held. */
1753static
d1f652f8 1754void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1755{
d1f652f8
MD		 1756 struct lttng_id_tracker *id_tracker = m->private;
1757 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1758 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1759 int iter = 0, i;
1760
1761 (*ppos)++;
d1f652f8
MD		 1762 if (id_tracker_p) {
1763 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1764 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1765
f934e302 1766 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1767 if (iter++ >= *ppos)
1768 return e;
1769 }
1770 }
1771 } else {
d1f652f8 1772 /* ID tracker disabled. */
7e6f9ef6 1773 if (iter >= *ppos && iter == 0)
d1f652f8 1774 return p; /* empty tracker */
7e6f9ef6
MD		 1775 iter++;
1776 }
1777
1778 /* End of list */
1779 return NULL;
1780}
1781
1782static
d1f652f8 1783void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1784{
1785 mutex_unlock(&sessions_mutex);
1786}
1787
1788static
d1f652f8 1789int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1790{
d1f652f8
MD		 1791 struct lttng_id_tracker *id_tracker = m->private;
1792 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1793 int id;
7e6f9ef6 1794
d1f652f8 1795 if (p == id_tracker_p) {
7e6f9ef6 1796 /* Tracker disabled. */
d1f652f8 1797 id = -1;
7e6f9ef6 1798 } else {
d1f652f8 1799 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1800
d1f652f8
MD		 1801 id = lttng_id_tracker_get_node_id(e);
1802 }
1803 switch (id_tracker->tracker_type) {
1804 case TRACKER_PID:
1805 seq_printf(m, "process { pid = %d; };\n", id);
1806 break;
1807 case TRACKER_VPID:
1808 seq_printf(m, "process { vpid = %d; };\n", id);
1809 break;
1810 case TRACKER_UID:
1811 seq_printf(m, "user { uid = %d; };\n", id);
1812 break;
1813 case TRACKER_VUID:
1814 seq_printf(m, "user { vuid = %d; };\n", id);
1815 break;
1816 case TRACKER_GID:
1817 seq_printf(m, "group { gid = %d; };\n", id);
1818 break;
1819 case TRACKER_VGID:
1820 seq_printf(m, "group { vgid = %d; };\n", id);
1821 break;
1822 default:
1823 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1824 }
7e6f9ef6
MD		 1825 return 0;
1826}
1827
1828static
d1f652f8
MD		 1829const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1830 .start = id_list_start,
1831 .next = id_list_next,
1832 .stop = id_list_stop,
1833 .show = id_list_show,
7e6f9ef6
MD		 1834};
1835
1836static
d1f652f8 1837int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1838{
d1f652f8 1839 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1840}
1841
1842static
d1f652f8 1843int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1844{
1845 struct seq_file *m = file->private_data;
d1f652f8 1846 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1847 int ret;
1848
d1f652f8 1849 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1850 ret = seq_release(inode, file);
d1f652f8
MD		 1851 if (!ret)
1852 fput(id_tracker->session->file);
7e6f9ef6
MD		 1853 return ret;
1854}
1855
d1f652f8 1856const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1857 .owner = THIS_MODULE,
d1f652f8 1858 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1859 .read = seq_read,
1860 .llseek = seq_lseek,
d1f652f8 1861 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1862};
1863
d1f652f8
MD		 1864int lttng_session_list_tracker_ids(struct lttng_session *session,
1865 enum tracker_type tracker_type)
7e6f9ef6 1866{
d1f652f8 1867 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1868 struct seq_file *m;
1869 int file_fd, ret;
1870
1871 file_fd = lttng_get_unused_fd();
1872 if (file_fd < 0) {
1873 ret = file_fd;
1874 goto fd_error;
1875 }
1876
d1f652f8
MD		 1877 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1878 &lttng_tracker_ids_list_fops,
7e6f9ef6 1879 NULL, O_RDWR);
d1f652f8
MD		 1880 if (IS_ERR(tracker_ids_list_file)) {
1881 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1882 goto file_error;
1883 }
98d7281c
MJ		 1884 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1885 ret = -EOVERFLOW;
9c1f4643
MD		 1886 goto refcount_error;
1887 }
d1f652f8 1888 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1889 if (ret < 0)
1890 goto open_error;
d1f652f8
MD		 1891 m = tracker_ids_list_file->private_data;
1892
1893 m->private = get_tracker(session, tracker_type);
1894 BUG_ON(!m->private);
1895 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1896
1897 return file_fd;
1898
1899open_error:
9c1f4643
MD		 1900 atomic_long_dec(&session->file->f_count);
1901refcount_error:
d1f652f8 1902 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1903file_error:
1904 put_unused_fd(file_fd);
1905fd_error:
1906 return ret;
1907}
1908
3c997079
MD		 1909/*
1910 * Enabler management.
1911 */
1912static
4993071a
PP		 1913int lttng_match_enabler_star_glob(const char *desc_name,
1914 const char *pattern)
3c997079 1915{
cbc19040
MD		 1916 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1917 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1918 return 0;
1919 return 1;
1920}
1921
1922static
4ecb5ad5
MD		 1923int lttng_match_enabler_name(const char *desc_name,
1924 const char *name)
3c997079 1925{
4ecb5ad5 1926 if (strcmp(desc_name, name))
3c997079
MD		 1927 return 0;
1928 return 1;
1929}
1930
437d5aa5 1931int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
3c997079
MD		 1932 struct lttng_enabler *enabler)
1933{
4ecb5ad5 1934 const char *desc_name, *enabler_name;
badfe9f5 1935 bool compat = false, entry = false;
4ecb5ad5
MD		 1936
1937 enabler_name = enabler->event_param.name;
1938 switch (enabler->event_param.instrumentation) {
606828e4 1939 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1940 desc_name = desc->event_name;
3b861b22
FD		 1941 switch (enabler->format_type) {
1942 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1943 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1944 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1945 return lttng_match_enabler_name(desc_name, enabler_name);
1946 default:
1947 return -EINVAL;
1948 }
4ecb5ad5 1949 break;
b4a75708 1950
606828e4 1951 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1952 desc_name = desc->event_name;
badfe9f5 1953 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1954 desc_name += strlen("compat_");
badfe9f5
MD		 1955 compat = true;
1956 }
4ecb5ad5
MD		 1957 if (!strncmp(desc_name, "syscall_exit_",
1958 strlen("syscall_exit_"))) {
1959 desc_name += strlen("syscall_exit_");
1960 } else if (!strncmp(desc_name, "syscall_entry_",
1961 strlen("syscall_entry_"))) {
1962 desc_name += strlen("syscall_entry_");
badfe9f5 1963 entry = true;
4ecb5ad5
MD		 1964 } else {
1965 WARN_ON_ONCE(1);
1966 return -EINVAL;
1967 }
badfe9f5 1968 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1969 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1970 break;
606828e4 1971 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1972 if (!entry)
1973 return 0;
1974 break;
606828e4 1975 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1976 if (entry)
1977 return 0;
1978 break;
1979 default:
1980 return -EINVAL;
1981 }
1982 switch (enabler->event_param.u.syscall.abi) {
606828e4 1983 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1984 break;
606828e4 1985 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1986 if (compat)
1987 return 0;
1988 break;
606828e4 1989 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1990 if (!compat)
1991 return 0;
1992 break;
1993 default:
1994 return -EINVAL;
1995 }
1996 switch (enabler->event_param.u.syscall.match) {
606828e4 1997 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1998 switch (enabler->format_type) {
1999 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2000 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2001 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2002 return lttng_match_enabler_name(desc_name, enabler_name);
2003 default:
2004 return -EINVAL;
2005 }
2006 break;
606828e4 2007 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2008 return -EINVAL; /* Not implemented. */
2009 default:
2010 return -EINVAL;
2011 }
4ecb5ad5 2012 break;
b4a75708 2013
4ecb5ad5
MD		 2014 default:
2015 WARN_ON_ONCE(1);
2016 return -EINVAL;
2017 }
3c997079
MD		 2018}
2019
2020static
b2bc0bc8 2021int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2022 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2023{
b2bc0bc8
FD		 2024 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
2025 event_enabler);
2026
a67ba386 2027 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2028 return 0;
a67ba386
MD		 2029 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2030 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2031 return 1;
2032 else
2033 return 0;
2034}
2035
b01155ba
FD		 2036static
2037int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2038 struct lttng_kernel_event_notifier *event_notifier)
b01155ba
FD		 2039{
2040 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
2041 event_notifier_enabler);
2042
a67ba386 2043 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2044 return 0;
a67ba386
MD		 2045 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2046 && event_notifier->priv->group == event_notifier_enabler->group
2047 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2048 return 1;
2049 else
2050 return 0;
2051}
2052
3c997079 2053static
b2bc0bc8
FD		 2054struct lttng_enabler_ref *lttng_enabler_ref(
2055 struct list_head *enablers_ref_list,
3c997079
MD		 2056 struct lttng_enabler *enabler)
2057{
2058 struct lttng_enabler_ref *enabler_ref;
2059
b2bc0bc8 2060 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2061 if (enabler_ref->ref == enabler)
2062 return enabler_ref;
2063 }
2064 return NULL;
2065}
2066
3c997079 2067static
1b917d6b 2068void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2069{
b2bc0bc8 2070 struct lttng_session *session = event_enabler->chan->session;
437d5aa5
MD		 2071 struct lttng_kernel_probe_desc *probe_desc;
2072 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2073 int i;
2074 struct list_head *probe_list;
2075
2076 probe_list = lttng_get_probe_list_head();
2077 /*
2078 * For each probe event, if we find that a probe event matches
2079 * our enabler, create an associated lttng_event if not
2080 * already present.
2081 */
2082 list_for_each_entry(probe_desc, probe_list, head) {
2083 for (i = 0; i < probe_desc->nr_events; i++) {
2084 int found = 0;
2085 struct hlist_head *head;
a67ba386
MD		 2086 struct lttng_kernel_event_recorder_private *event_recorder_private;
2087 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2088
2089 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2090 if (!lttng_desc_match_enabler(desc,
2091 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2092 continue;
3c997079
MD		 2093
2094 /*
2095 * Check if already created.
2096 */
4a11ef1c
FD		 2097 head = utils_borrow_hash_table_bucket(
2098 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2099 desc->event_name);
a67ba386
MD		 2100 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2101 if (event_recorder_private->parent.desc == desc
2102 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2103 found = 1;
2104 }
2105 if (found)
2106 continue;
2107
2108 /*
2109 * We need to create an event for this
2110 * event probe.
2111 */
a67ba386
MD		 2112 event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan,
2113 NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT);
2114 if (!event_recorder) {
5a15f70c 2115 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2116 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2117 }
2118 }
2119 }
2120}
2121
b01155ba
FD		 2122static
2123void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2124{
2125 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2126 struct lttng_kernel_probe_desc *probe_desc;
2127 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2128 int i;
2129 struct list_head *probe_list;
2130
2131 probe_list = lttng_get_probe_list_head();
2132 /*
2133 * For each probe event, if we find that a probe event matches
2134 * our enabler, create an associated lttng_event_notifier if not
2135 * already present.
2136 */
2137 list_for_each_entry(probe_desc, probe_list, head) {
2138 for (i = 0; i < probe_desc->nr_events; i++) {
2139 int found = 0;
2140 struct hlist_head *head;
a67ba386
MD		 2141 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2142 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2143
2144 desc = probe_desc->event_desc[i];
2145 if (!lttng_desc_match_enabler(desc,
2146 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2147 continue;
2148
2149 /*
2150 * Check if already created.
2151 */
2152 head = utils_borrow_hash_table_bucket(
2153 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2154 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2155 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2156 if (event_notifier_priv->parent.desc == desc
2157 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2158 found = 1;
2159 }
2160 if (found)
2161 continue;
2162
2163 /*
2164 * We need to create a event_notifier for this event probe.
2165 */
2166 event_notifier = _lttng_event_notifier_create(desc,
2167 event_notifier_enabler->base.user_token,
99f52fcc 2168 event_notifier_enabler->error_counter_index,
a67ba386 2169 event_notifier_group, NULL,
606828e4 2170 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2171 if (IS_ERR(event_notifier)) {
2172 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2173 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2174 }
2175 }
2176 }
2177}
2178
33a39a3c 2179static
1b917d6b 2180void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2181{
2182 int ret;
2183
a67ba386 2184 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2185 WARN_ON_ONCE(ret);
2186}
2187
8a8ac9a8
FD		 2188static
2189void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2190{
2191 int ret;
2192
a67ba386 2193 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2194 WARN_ON_ONCE(ret);
a67ba386 2195 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2196 WARN_ON_ONCE(ret);
2197}
2198
33a39a3c 2199/*
a67ba386 2200 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2201 * tracepoint probes.
2202 * Should be called with sessions mutex held.
2203 */
2204static
b2bc0bc8 2205void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2206{
b2bc0bc8 2207 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2208 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2209 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2210 break;
b4a75708 2211
606828e4 2212 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2213 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2214 break;
b4a75708 2215
33a39a3c
MD		 2216 default:
2217 WARN_ON_ONCE(1);
2218 break;
2219 }
2220}
2221
3c997079 2222/*
b2bc0bc8 2223 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2224 * and add backward reference from the event to the enabler.
2225 * Should be called with sessions mutex held.
2226 */
2227static
b2bc0bc8 2228int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2229{
b2bc0bc8
FD		 2230 struct lttng_channel *chan = event_enabler->chan;
2231 struct lttng_session *session = event_enabler->chan->session;
2232 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2233 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2234
606828e4
MD		 2235 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2236 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2237 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2238 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2239 int enabled = base_enabler->enabled;
606828e4 2240 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2241
606828e4 2242 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1
MD		 2243 WRITE_ONCE(chan->syscall_all_entry, enabled);
2244
606828e4 2245 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1 2246 WRITE_ONCE(chan->syscall_all_exit, enabled);
badfe9f5
MD		 2247 }
2248
3c997079 2249 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2250 lttng_create_event_if_missing(event_enabler);
3c997079 2251
b2bc0bc8 2252 /* For each event matching event_enabler in session event list. */
a67ba386
MD		 2253 list_for_each_entry(event_recorder_priv, &session->events, node) {
2254 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2255 struct lttng_enabler_ref *enabler_ref;
2256
a67ba386 2257 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2258 continue;
a67ba386 2259 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2260 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2261 if (!enabler_ref) {
2262 /*
2263 * If no backward ref, create it.
b2bc0bc8 2264 * Add backward ref from event to event_enabler.
3c997079
MD		 2265 */
2266 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2267 if (!enabler_ref)
2268 return -ENOMEM;
b2bc0bc8 2269 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2270 list_add(&enabler_ref->node,
a67ba386 2271 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2272 }
2273
f127e61e
MD		 2274 /*
2275 * Link filter bytecodes if not linked yet.
2276 */
a67ba386 2277 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2278 lttng_static_ctx,
a67ba386 2279 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2280 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2281 }
2282 return 0;
2283}
2284
b01155ba 2285/*
a67ba386 2286 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2287 * tracepoint probes.
2288 * Should be called with sessions mutex held.
2289 */
2290static
2291void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2292{
2293 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2294 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2295 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2296 break;
b4a75708 2297
606828e4 2298 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2299 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2300 break;
b4a75708 2301
b01155ba
FD		 2302 default:
2303 WARN_ON_ONCE(1);
2304 break;
2305 }
2306}
2307
2308/*
2309 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2310 */
2311static
8a8ac9a8
FD		 2312int lttng_event_notifier_enabler_ref_event_notifiers(
2313 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2314{
2315 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2316 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2317 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2318
606828e4
MD		 2319 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2320 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2321 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2322 !strcmp(base_enabler->event_param.name, "*")) {
2323
2324 int enabled = base_enabler->enabled;
606828e4 2325 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2326
606828e4 2327 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2328 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2329
606828e4 2330 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2331 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2332
2333 }
2334
b01155ba
FD		 2335 /* First ensure that probe event_notifiers are created for this enabler. */
2336 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2337
2338 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2339 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2340 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2341 struct lttng_enabler_ref *enabler_ref;
2342
2343 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2344 continue;
2345
a67ba386 2346 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2347 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2348 if (!enabler_ref) {
2349 /*
2350 * If no backward ref, create it.
2351 * Add backward ref from event_notifier to enabler.
2352 */
2353 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2354 if (!enabler_ref)
2355 return -ENOMEM;
2356
2357 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2358 event_notifier_enabler);
2359 list_add(&enabler_ref->node,
a67ba386 2360 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2361 }
2362
2363 /*
2364 * Link filter bytecodes if not linked yet.
2365 */
a67ba386
MD		 2366 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2367 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2368 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2369
2370 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2371 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2372 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2373 &event_notifier_enabler->capture_bytecode_head);
2374
a67ba386 2375 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2376 }
2377 return 0;
2378}
2379
3c997079
MD		 2380/*
2381 * Called at module load: connect the probe on all enablers matching
2382 * this event.
2383 * Called with sessions lock held.
2384 */
2385int lttng_fix_pending_events(void)
2386{
2387 struct lttng_session *session;
2388
2389 list_for_each_entry(session, &sessions, list)
b2bc0bc8 2390 lttng_session_lazy_sync_event_enablers(session);
3c997079
MD		 2391 return 0;
2392}
2393
b01155ba
FD		 2394static bool lttng_event_notifier_group_has_active_event_notifiers(
2395 struct lttng_event_notifier_group *event_notifier_group)
2396{
2397 struct lttng_event_notifier_enabler *event_notifier_enabler;
2398
2399 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2400 node) {
2401 if (event_notifier_enabler->base.enabled)
2402 return true;
2403 }
2404 return false;
2405}
2406
2407bool lttng_event_notifier_active(void)
2408{
2409 struct lttng_event_notifier_group *event_notifier_group;
2410
2411 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2412 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2413 return true;
2414 }
2415 return false;
2416}
2417
2418int lttng_fix_pending_event_notifiers(void)
2419{
2420 struct lttng_event_notifier_group *event_notifier_group;
2421
2422 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2423 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2424 return 0;
2425}
2426
b2bc0bc8
FD		 2427struct lttng_event_enabler *lttng_event_enabler_create(
2428 enum lttng_enabler_format_type format_type,
606828e4 2429 struct lttng_kernel_abi_event *event_param,
3c997079
MD		 2430 struct lttng_channel *chan)
2431{
b2bc0bc8 2432 struct lttng_event_enabler *event_enabler;
3c997079 2433
b2bc0bc8
FD		 2434 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2435 if (!event_enabler)
3c997079 2436 return NULL;
b2bc0bc8
FD		 2437 event_enabler->base.format_type = format_type;
2438 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2439 memcpy(&event_enabler->base.event_param, event_param,
2440 sizeof(event_enabler->base.event_param));
2441 event_enabler->chan = chan;
3c997079 2442 /* ctx left NULL */
b2bc0bc8 2443 event_enabler->base.enabled = 0;
3c997079 2444 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2445 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2446 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2447 mutex_unlock(&sessions_mutex);
b2bc0bc8 2448 return event_enabler;
3c997079
MD		 2449}
2450
b2bc0bc8 2451int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2452{
2453 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2454 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2455 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2456 mutex_unlock(&sessions_mutex);
2457 return 0;
2458}
2459
b2bc0bc8 2460int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2461{
2462 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2463 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2464 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2465 mutex_unlock(&sessions_mutex);
2466 return 0;
2467}
2468
b2bc0bc8 2469static
183e8b3a 2470int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
606828e4 2471 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2472{
89ec2b91 2473 struct lttng_bytecode_node *bytecode_node;
07dfc1d0
MD		 2474 uint32_t bytecode_len;
2475 int ret;
2476
2477 ret = get_user(bytecode_len, &bytecode->len);
2478 if (ret)
2479 return ret;
52cfcdf3 2480 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2481 GFP_KERNEL);
2482 if (!bytecode_node)
2483 return -ENOMEM;
2484 ret = copy_from_user(&bytecode_node->bc, bytecode,
2485 sizeof(*bytecode) + bytecode_len);
2486 if (ret)
2487 goto error_free;
b2bc0bc8 2488
89ec2b91 2489 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER;
07dfc1d0
MD		 2490 bytecode_node->enabler = enabler;
2491 /* Enforce length based on allocated size */
2492 bytecode_node->bc.len = bytecode_len;
2493 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2494
07dfc1d0
MD		 2495 return 0;
2496
2497error_free:
52cfcdf3 2498 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2499 return ret;
2500}
2501
183e8b3a 2502int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2503 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2504{
2505 int ret;
183e8b3a 2506 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2507 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2508 if (ret)
2509 goto error;
2510
2511 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2512 return 0;
2513
2514error:
2515 return ret;
2516}
2517
a67ba386 2518int lttng_event_add_callsite(struct lttng_kernel_event_recorder *event_recorder,
606828e4 2519 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2520{
2521
a67ba386 2522 switch (event_recorder->priv->parent.instrumentation) {
606828e4 2523 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 2524 return lttng_uprobes_event_add_callsite(event_recorder, callsite);
3aed4dca
FD		 2525 default:
2526 return -EINVAL;
2527 }
2528}
2529
3c997079
MD		 2530static
2531void lttng_enabler_destroy(struct lttng_enabler *enabler)
2532{
89ec2b91 2533 struct lttng_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2534
2535 /* Destroy filter bytecode */
2536 list_for_each_entry_safe(filter_node, tmp_filter_node,
2537 &enabler->filter_bytecode_head, node) {
52cfcdf3 2538 lttng_kvfree(filter_node);
07dfc1d0 2539 }
b2bc0bc8
FD		 2540}
2541
2542static
2543void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2544{
2545 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2546
b2bc0bc8
FD		 2547 list_del(&event_enabler->node);
2548 kfree(event_enabler);
3c997079
MD		 2549}
2550
dffef45d
FD		 2551struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2552 struct lttng_event_notifier_group *event_notifier_group,
2553 enum lttng_enabler_format_type format_type,
606828e4 2554 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2555{
2556 struct lttng_event_notifier_enabler *event_notifier_enabler;
2557
2558 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2559 if (!event_notifier_enabler)
2560 return NULL;
2561
2562 event_notifier_enabler->base.format_type = format_type;
2563 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2564 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2565
99f52fcc 2566 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2567 event_notifier_enabler->num_captures = 0;
dffef45d 2568
8a8ac9a8
FD		 2569 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2570 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2571
2572 event_notifier_enabler->base.enabled = 0;
2573 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2574 event_notifier_enabler->group = event_notifier_group;
2575
2576 mutex_lock(&sessions_mutex);
2577 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2578 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2579
2580 mutex_unlock(&sessions_mutex);
2581
2582 return event_notifier_enabler;
2583}
2584
2585int lttng_event_notifier_enabler_enable(
2586 struct lttng_event_notifier_enabler *event_notifier_enabler)
2587{
2588 mutex_lock(&sessions_mutex);
2589 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2590 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2591 mutex_unlock(&sessions_mutex);
2592 return 0;
2593}
2594
2595int lttng_event_notifier_enabler_disable(
2596 struct lttng_event_notifier_enabler *event_notifier_enabler)
2597{
2598 mutex_lock(&sessions_mutex);
2599 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2600 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2601 mutex_unlock(&sessions_mutex);
2602 return 0;
2603}
2604
183e8b3a 2605int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2606 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2607 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2608{
2609 int ret;
2610
183e8b3a 2611 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2612 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2613 bytecode);
2614 if (ret)
2615 goto error;
2616
b01155ba 2617 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2618 return 0;
2619
2620error:
2621 return ret;
2622}
2623
99d223ad
FD		 2624int lttng_event_notifier_enabler_attach_capture_bytecode(
2625 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2626 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad
FD		 2627{
2628 struct lttng_bytecode_node *bytecode_node;
2629 struct lttng_enabler *enabler =
2630 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2631 uint32_t bytecode_len;
2632 int ret;
2633
2634 ret = get_user(bytecode_len, &bytecode->len);
2635 if (ret)
2636 return ret;
2637
2638 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2639 GFP_KERNEL);
2640 if (!bytecode_node)
2641 return -ENOMEM;
2642
2643 ret = copy_from_user(&bytecode_node->bc, bytecode,
2644 sizeof(*bytecode) + bytecode_len);
2645 if (ret)
2646 goto error_free;
2647
2648 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE;
2649 bytecode_node->enabler = enabler;
2650
2651 /* Enforce length based on allocated size */
2652 bytecode_node->bc.len = bytecode_len;
2653 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2654
2655 event_notifier_enabler->num_captures++;
2656
2657 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2658 goto end;
2659
2660error_free:
2661 lttng_kvfree(bytecode_node);
2662end:
2663 return ret;
2664}
2665
a67ba386 2666int lttng_event_notifier_add_callsite(struct lttng_kernel_event_notifier *event_notifier,
606828e4 2667 struct lttng_kernel_abi_event_callsite __user *callsite)
9de67196
FD		 2668{
2669
a67ba386 2670 switch (event_notifier->priv->parent.instrumentation) {
606828e4 2671 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 2672 return lttng_uprobes_event_notifier_add_callsite(event_notifier,
2673 callsite);
2674 default:
2675 return -EINVAL;
2676 }
2677}
2678
dffef45d
FD		 2679static
2680void lttng_event_notifier_enabler_destroy(
2681 struct lttng_event_notifier_enabler *event_notifier_enabler)
2682{
2683 if (!event_notifier_enabler) {
2684 return;
2685 }
2686
2687 list_del(&event_notifier_enabler->node);
2688
2689 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2690 kfree(event_notifier_enabler);
2691}
2692
3c997079 2693/*
b2bc0bc8 2694 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2695 * session.
2696 * Should be called with sessions mutex held.
2697 */
2698static
b2bc0bc8 2699void lttng_session_sync_event_enablers(struct lttng_session *session)
3c997079 2700{
b2bc0bc8 2701 struct lttng_event_enabler *event_enabler;
a67ba386 2702 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2703
b2bc0bc8
FD		 2704 list_for_each_entry(event_enabler, &session->enablers_head, node)
2705 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2706 /*
2707 * For each event, if at least one of its enablers is enabled,
2708 * and its channel and session transient states are enabled, we
2709 * enable the event, else we disable it.
2710 */
a67ba386
MD		 2711 list_for_each_entry(event_recorder_priv, &session->events, node) {
2712 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2713 struct lttng_enabler_ref *enabler_ref;
07dfc1d0
MD		 2714 struct lttng_bytecode_runtime *runtime;
2715 int enabled = 0, has_enablers_without_bytecode = 0;
3c997079 2716
a67ba386 2717 switch (event_recorder_priv->parent.instrumentation) {
606828e4
MD		 2718 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2719 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2720 /* Enable events */
2721 list_for_each_entry(enabler_ref,
a67ba386 2722 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2723 if (enabler_ref->ref->enabled) {
2724 enabled = 1;
2725 break;
2726 }
2727 }
4ecb5ad5 2728 break;
b4a75708 2729
4ecb5ad5 2730 default:
3c997079
MD		 2731 /* Not handled with lazy sync. */
2732 continue;
2733 }
2734 /*
2735 * Enabled state is based on union of enablers, with
2736 * intesection of session and channel transient enable
2737 * states.
2738 */
a67ba386 2739 enabled = enabled && session->tstate && event_recorder->chan->tstate;
3c997079 2740
a67ba386 2741 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2742 /*
2743 * Sync tracepoint registration with event enabled
2744 * state.
2745 */
2746 if (enabled) {
a67ba386 2747 register_event(event_recorder);
3c997079 2748 } else {
a67ba386 2749 _lttng_event_unregister(event_recorder);
3c997079 2750 }
07dfc1d0
MD		 2751
2752 /* Check if has enablers without bytecode enabled */
2753 list_for_each_entry(enabler_ref,
a67ba386 2754 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2755 if (enabler_ref->ref->enabled
2756 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2757 has_enablers_without_bytecode = 1;
2758 break;
2759 }
2760 }
a67ba386 2761 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
07dfc1d0
MD		 2762 has_enablers_without_bytecode;
2763
2764 /* Enable filters */
2765 list_for_each_entry(runtime,
a67ba386 2766 &event_recorder_priv->parent.filter_bytecode_runtime_head, node)
0b365677 2767 lttng_bytecode_filter_sync_state(runtime);
3c997079
MD		 2768 }
2769}
2770
2771/*
2772 * Apply enablers to session events, adding events to session if need
2773 * be. It is required after each modification applied to an active
2774 * session, and right before session "start".
2775 * "lazy" sync means we only sync if required.
2776 * Should be called with sessions mutex held.
2777 */
2778static
b2bc0bc8 2779void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
3c997079
MD		 2780{
2781 /* We can skip if session is not active */
2782 if (!session->active)
2783 return;
b2bc0bc8 2784 lttng_session_sync_event_enablers(session);
3c997079
MD		 2785}
2786
b01155ba
FD		 2787static
2788void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2789{
2790 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2791 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2792
2793 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2794 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2795
2796 /*
2797 * For each event_notifier, if at least one of its enablers is enabled,
2798 * we enable the event_notifier, else we disable it.
2799 */
a67ba386
MD		 2800 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2801 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2802 struct lttng_enabler_ref *enabler_ref;
2803 struct lttng_bytecode_runtime *runtime;
2804 int enabled = 0, has_enablers_without_bytecode = 0;
2805
a67ba386 2806 switch (event_notifier_priv->parent.instrumentation) {
606828e4
MD		 2807 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2808 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2809 /* Enable event_notifiers */
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 enabled = 1;
2814 break;
2815 }
2816 }
2817 break;
b4a75708 2818
b01155ba
FD		 2819 default:
2820 /* Not handled with sync. */
2821 continue;
2822 }
2823
a67ba386 2824 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2825 /*
2826 * Sync tracepoint registration with event_notifier enabled
2827 * state.
2828 */
2829 if (enabled) {
a67ba386 2830 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2831 register_event_notifier(event_notifier);
2832 } else {
a67ba386 2833 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2834 _lttng_event_notifier_unregister(event_notifier);
2835 }
2836
2837 /* Check if has enablers without bytecode enabled */
2838 list_for_each_entry(enabler_ref,
a67ba386 2839 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2840 if (enabler_ref->ref->enabled
2841 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2842 has_enablers_without_bytecode = 1;
2843 break;
2844 }
2845 }
a67ba386 2846 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
b01155ba
FD		 2847 has_enablers_without_bytecode;
2848
2849 /* Enable filters */
2850 list_for_each_entry(runtime,
a67ba386 2851 &event_notifier_priv->parent.filter_bytecode_runtime_head, node)
0b365677 2852 lttng_bytecode_filter_sync_state(runtime);
99d223ad
FD		 2853
2854 /* Enable captures */
2855 list_for_each_entry(runtime,
a67ba386 2856 &event_notifier_priv->capture_bytecode_runtime_head, node)
99d223ad 2857 lttng_bytecode_capture_sync_state(runtime);
c3eddb2e 2858
a67ba386 2859 WRITE_ONCE(event_notifier->eval_capture, !!event_notifier_priv->num_captures);
b01155ba
FD		 2860 }
2861}
2862
1ec3f75a 2863/*
d83004aa
JD		 2864 * Serialize at most one packet worth of metadata into a metadata
2865 * channel.
92d9f5e6
MD		 2866 * We grab the metadata cache mutex to get exclusive access to our metadata
2867 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2868 * allows us to do racy operations such as looking for remaining space left in
2869 * packet and write, since mutual exclusion protects us from concurrent writes.
2870 * Mutual exclusion on the metadata cache allow us to read the cache content
2871 * without racing against reallocation of the cache by updates.
35097f36
JD		 2872 * Returns the number of bytes written in the channel, 0 if no data
2873 * was written and a negative value on error.
1ec3f75a 2874 */
b3b8072b 2875int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2876 struct channel *chan, bool *coherent)
d83004aa
JD		 2877{
2878 struct lib_ring_buffer_ctx ctx;
2879 int ret = 0;
2880 size_t len, reserve_len;
2881
f613e3e6 2882 /*
92d9f5e6
MD		 2883 * Ensure we support mutiple get_next / put sequences followed by
2884 * put_next. The metadata cache lock protects reading the metadata
2885 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2886 * "flush" operations on the buffer invoked by different processes.
2887 * Moreover, since the metadata cache memory can be reallocated, we
2888 * need to have exclusive access against updates even though we only
2889 * read it.
f613e3e6 2890 */
92d9f5e6 2891 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2892 WARN_ON(stream->metadata_in < stream->metadata_out);
2893 if (stream->metadata_in != stream->metadata_out)
de23d59d 2894 goto end;
f613e3e6 2895
9616f0bf
JD		 2896 /* Metadata regenerated, change the version. */
2897 if (stream->metadata_cache->version != stream->version)
2898 stream->version = stream->metadata_cache->version;
2899
d83004aa 2900 len = stream->metadata_cache->metadata_written -
f613e3e6 2901 stream->metadata_in;
9de2c215 2902 if (!len)
de23d59d 2903 goto end;
d83004aa 2904 reserve_len = min_t(size_t,
b3b8072b 2905 stream->transport->ops.packet_avail_size(chan),
d83004aa 2906 len);
b3b8072b 2907 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
d83004aa
JD		 2908 sizeof(char), -1);
2909 /*
2910 * If reservation failed, return an error to the caller.
2911 */
b3b8072b 2912 ret = stream->transport->ops.event_reserve(&ctx, 0);
d83004aa
JD		 2913 if (ret != 0) {
2914 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2915 stream->coherent = false;
d83004aa
JD		 2916 goto end;
2917 }
b3b8072b 2918 stream->transport->ops.event_write(&ctx,
f613e3e6 2919 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2920 reserve_len);
b3b8072b 2921 stream->transport->ops.event_commit(&ctx);
f613e3e6 2922 stream->metadata_in += reserve_len;
3e75e2a7 2923 if (reserve_len < len)
8b97fd42
MD		 2924 stream->coherent = false;
2925 else
2926 stream->coherent = true;
d83004aa
JD		 2927 ret = reserve_len;
2928
2929end:
8b97fd42
MD		 2930 if (coherent)
2931 *coherent = stream->coherent;
92d9f5e6 2932 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2933 return ret;
2934}
2935
8b97fd42
MD		 2936static
2937void lttng_metadata_begin(struct lttng_session *session)
2938{
3e75e2a7
MD		 2939 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2940 mutex_lock(&session->metadata_cache->lock);
8b97fd42
MD		 2941}
2942
2943static
2944void lttng_metadata_end(struct lttng_session *session)
2945{
3e75e2a7
MD		 2946 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2947 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2948 struct lttng_metadata_stream *stream;
2949
3e75e2a7
MD		 2950 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2951 wake_up_interruptible(&stream->read_wait);
92143b2c 2952 mutex_unlock(&session->metadata_cache->lock);
3e75e2a7 2953 }
8b97fd42
MD		 2954}
2955
d83004aa
JD		 2956/*
2957 * Write the metadata to the metadata cache.
2958 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2959 * The metadata cache lock protects us from concurrent read access from
2960 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2961 * The content of the printf is printed as a single atomic metadata
2962 * transaction.
d83004aa 2963 */
a90917c3 2964int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 2965 const char *fmt, ...)
2966{
c099397a 2967 char *str;
d83004aa 2968 size_t len;
c099397a
MD		 2969 va_list ap;
2970
585e5dcc 2971 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2972
2973 va_start(ap, fmt);
2974 str = kvasprintf(GFP_KERNEL, fmt, ap);
2975 va_end(ap);
2976 if (!str)
2977 return -ENOMEM;
2978
1ec3f75a 2979 len = strlen(str);
3e75e2a7 2980 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 2981 if (session->metadata_cache->metadata_written + len >
2982 session->metadata_cache->cache_alloc) {
2983 char *tmp_cache_realloc;
2984 unsigned int tmp_cache_alloc_size;
2985
2986 tmp_cache_alloc_size = max_t(unsigned int,
2987 session->metadata_cache->cache_alloc + len,
2988 session->metadata_cache->cache_alloc << 1);
0ca42eb7 2989 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2990 if (!tmp_cache_realloc)
2991 goto err;
a606b6e8
ML		 2992 if (session->metadata_cache->data) {
2993 memcpy(tmp_cache_realloc,
2994 session->metadata_cache->data,
2995 session->metadata_cache->cache_alloc);
2996 vfree(session->metadata_cache->data);
2997 }
2998
d83004aa
JD		 2999 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3000 session->metadata_cache->data = tmp_cache_realloc;
c099397a 3001 }
d83004aa
JD		 3002 memcpy(session->metadata_cache->data +
3003 session->metadata_cache->metadata_written,
3004 str, len);
3005 session->metadata_cache->metadata_written += len;
c099397a 3006 kfree(str);
d83004aa 3007
d83004aa
JD		 3008 return 0;
3009
3010err:
3011 kfree(str);
3012 return -ENOMEM;
c099397a
MD		 3013}
3014
f513b2bf
MD		 3015static
3016int print_tabs(struct lttng_session *session, size_t nesting)
3017{
3018 size_t i;
3019
3020 for (i = 0; i < nesting; i++) {
3021 int ret;
3022
3023 ret = lttng_metadata_printf(session, " ");
3024 if (ret) {
3025 return ret;
3026 }
3027 }
3028 return 0;
3029}
3030
ceabb767
MD		 3031static
3032int lttng_field_name_statedump(struct lttng_session *session,
437d5aa5 3033 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3034 size_t nesting)
3035{
3036 return lttng_metadata_printf(session, " _%s;\n", field->name);
3037}
3038
3039static
3040int _lttng_integer_type_statedump(struct lttng_session *session,
437d5aa5
MD		 3041 const struct lttng_kernel_type_integer *type,
3042 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3043 size_t nesting)
3044{
3045 int ret;
3046
ceabb767
MD		 3047 ret = print_tabs(session, nesting);
3048 if (ret)
3049 return ret;
3050 ret = lttng_metadata_printf(session,
3051 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3052 type->size,
3053 type->alignment,
3054 type->signedness,
3055 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3056 ? "none"
437d5aa5 3057 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3058 ? "UTF8"
3059 : "ASCII",
437d5aa5 3060 type->base,
ceabb767 3061#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3062 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3063#else
437d5aa5 3064 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3065#endif
3066 );
3067 return ret;
3068}
3069
f513b2bf
MD		 3070/*
3071 * Must be called with sessions_mutex held.
3072 */
3073static
3074int _lttng_struct_type_statedump(struct lttng_session *session,
437d5aa5 3075 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3076 size_t nesting)
3077{
3078 int ret;
3079 uint32_t i, nr_fields;
ceabb767
MD		 3080 unsigned int alignment;
3081
f513b2bf
MD		 3082 ret = print_tabs(session, nesting);
3083 if (ret)
3084 return ret;
3085 ret = lttng_metadata_printf(session,
3086 "struct {\n");
3087 if (ret)
3088 return ret;
437d5aa5 3089 nr_fields = type->nr_fields;
f513b2bf 3090 for (i = 0; i < nr_fields; i++) {
437d5aa5 3091 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3092
437d5aa5 3093 iter_field = type->fields[i];
f513b2bf
MD		 3094 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
3095 if (ret)
3096 return ret;
3097 }
3098 ret = print_tabs(session, nesting);
3099 if (ret)
3100 return ret;
437d5aa5 3101 alignment = type->alignment;
ceabb767
MD		 3102 if (alignment) {
3103 ret = lttng_metadata_printf(session,
3104 "} align(%u)",
3105 alignment);
3106 } else {
3107 ret = lttng_metadata_printf(session,
3108 "}");
3109 }
f513b2bf
MD		 3110 return ret;
3111}
3112
3113/*
3114 * Must be called with sessions_mutex held.
3115 */
3116static
ceabb767 3117int _lttng_struct_field_statedump(struct lttng_session *session,
437d5aa5 3118 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3119 size_t nesting)
3120{
3121 int ret;
3122
3123 ret = _lttng_struct_type_statedump(session,
437d5aa5 3124 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3125 if (ret)
3126 return ret;
ceabb767 3127 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3128}
3129
65c85aa6
MD		 3130/*
3131 * Must be called with sessions_mutex held.
3132 */
3133static
3134int _lttng_variant_type_statedump(struct lttng_session *session,
437d5aa5 3135 const struct lttng_kernel_type_variant *type,
65c85aa6
MD		 3136 size_t nesting)
3137{
3138 int ret;
3139 uint32_t i, nr_choices;
3140
ceabb767
MD		 3141 /*
3142 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3143 */
437d5aa5 3144 if (type->alignment != 0)
ceabb767 3145 return -EINVAL;
65c85aa6
MD		 3146 ret = print_tabs(session, nesting);
3147 if (ret)
3148 return ret;
3149 ret = lttng_metadata_printf(session,
3150 "variant <_%s> {\n",
437d5aa5 3151 type->tag_name);
65c85aa6
MD		 3152 if (ret)
3153 return ret;
437d5aa5 3154 nr_choices = type->nr_choices;
65c85aa6 3155 for (i = 0; i < nr_choices; i++) {
437d5aa5 3156 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3157
437d5aa5 3158 iter_field = type->choices[i];
65c85aa6
MD		 3159 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
3160 if (ret)
3161 return ret;
3162 }
3163 ret = print_tabs(session, nesting);
3164 if (ret)
3165 return ret;
3166 ret = lttng_metadata_printf(session,
3167 "}");
3168 return ret;
3169}
3170
3171/*
3172 * Must be called with sessions_mutex held.
3173 */
3174static
ceabb767 3175int _lttng_variant_field_statedump(struct lttng_session *session,
437d5aa5 3176 const struct lttng_kernel_event_field *field,
65c85aa6
MD		 3177 size_t nesting)
3178{
3179 int ret;
3180
3181 ret = _lttng_variant_type_statedump(session,
437d5aa5 3182 lttng_kernel_get_type_variant(field->type), nesting);
65c85aa6
MD		 3183 if (ret)
3184 return ret;
ceabb767 3185 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3186}
3187
f513b2bf
MD		 3188/*
3189 * Must be called with sessions_mutex held.
3190 */
3191static
ceabb767 3192int _lttng_array_field_statedump(struct lttng_session *session,
437d5aa5 3193 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3194 size_t nesting)
3195{
3196 int ret;
437d5aa5
MD		 3197 const struct lttng_kernel_type_array *array_type;
3198 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3199
437d5aa5
MD		 3200 array_type = lttng_kernel_get_type_array(field->type);
3201 WARN_ON_ONCE(!array_type);
ceabb767 3202
437d5aa5 3203 if (array_type->alignment) {
ceabb767 3204 ret = print_tabs(session, nesting);
f513b2bf
MD		 3205 if (ret)
3206 return ret;
ceabb767
MD		 3207 ret = lttng_metadata_printf(session,
3208 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3209 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3210 field->name);
3211 if (ret)
3212 return ret;
3213 }
3214 /*
3215 * Nested compound types: Only array of structures and variants are
3216 * currently supported.
3217 */
437d5aa5 3218 elem_type = array_type->elem_type;
12bb2edb
MD		 3219 switch (elem_type->type) {
3220 case lttng_kernel_type_integer:
437d5aa5
MD		 3221 case lttng_kernel_type_struct:
3222 case lttng_kernel_type_variant:
3223 ret = _lttng_type_statedump(session, elem_type,
3224 array_type->encoding, nesting);
65c85aa6
MD		 3225 if (ret)
3226 return ret;
3227 break;
ceabb767 3228
f513b2bf
MD		 3229 default:
3230 return -EINVAL;
3231 }
3232 ret = lttng_metadata_printf(session,
3233 " _%s[%u];\n",
3234 field->name,
437d5aa5 3235 array_type->length);
f513b2bf
MD		 3236 return ret;
3237}
3238
3239/*
3240 * Must be called with sessions_mutex held.
3241 */
3242static
ceabb767 3243int _lttng_sequence_field_statedump(struct lttng_session *session,
437d5aa5 3244 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3245 size_t nesting)
3246{
3247 int ret;
3248 const char *length_name;
437d5aa5
MD		 3249 const struct lttng_kernel_type_sequence *sequence_type;
3250 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3251
437d5aa5
MD		 3252 sequence_type = lttng_kernel_get_type_sequence(field->type);
3253 WARN_ON_ONCE(!sequence_type);
f513b2bf 3254
437d5aa5 3255 length_name = sequence_type->length_name;
ceabb767 3256
437d5aa5 3257 if (sequence_type->alignment) {
ceabb767 3258 ret = print_tabs(session, nesting);
f513b2bf
MD		 3259 if (ret)
3260 return ret;
ceabb767
MD		 3261 ret = lttng_metadata_printf(session,
3262 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3263 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3264 field->name);
3265 if (ret)
3266 return ret;
3267 }
3268
3269 /*
3270 * Nested compound types: Only array of structures and variants are
3271 * currently supported.
3272 */
437d5aa5 3273 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3274 switch (elem_type->type) {
3275 case lttng_kernel_type_integer:
437d5aa5
MD		 3276 case lttng_kernel_type_struct:
3277 case lttng_kernel_type_variant:
3278 ret = _lttng_type_statedump(session, elem_type,
3279 sequence_type->encoding, nesting);
65c85aa6
MD		 3280 if (ret)
3281 return ret;
3282 break;
ceabb767 3283
f513b2bf
MD		 3284 default:
3285 return -EINVAL;
3286 }
3287 ret = lttng_metadata_printf(session,
3288 " _%s[ _%s ];\n",
3289 field->name,
437d5aa5 3290 sequence_type->length_name);
f513b2bf
MD		 3291 return ret;
3292}
3293
141ddf28
MD		 3294/*
3295 * Must be called with sessions_mutex held.
3296 */
3297static
ceabb767 3298int _lttng_enum_type_statedump(struct lttng_session *session,
437d5aa5 3299 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3300 size_t nesting)
3301{
d96a4a7a 3302 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3303 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3304 int ret;
3305 unsigned int i, nr_entries;
3306
437d5aa5 3307 container_type = type->container_type;
12bb2edb 3308 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3309 ret = -EINVAL;
3310 goto end;
3311 }
437d5aa5 3312 enum_desc = type->desc;
141ddf28
MD		 3313 nr_entries = enum_desc->nr_entries;
3314
3315 ret = print_tabs(session, nesting);
3316 if (ret)
3317 goto end;
ceabb767
MD		 3318 ret = lttng_metadata_printf(session, "enum : ");
3319 if (ret)
3320 goto end;
437d5aa5
MD		 3321 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3322 lttng_kernel_string_encoding_none, 0);
141ddf28 3323 if (ret)
ceabb767
MD		 3324 goto end;
3325 ret = lttng_metadata_printf(session, " {\n");
3326 if (ret)
3327 goto end;
141ddf28
MD		 3328 /* Dump all entries */
3329 for (i = 0; i < nr_entries; i++) {
437d5aa5 3330 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3331 int j, len;
3332
3333 ret = print_tabs(session, nesting + 1);
3334 if (ret)
3335 goto end;
3336 ret = lttng_metadata_printf(session,
3337 "\"");
3338 if (ret)
3339 goto end;
3340 len = strlen(entry->string);
3341 /* Escape the character '"' */
3342 for (j = 0; j < len; j++) {
3343 char c = entry->string[j];
3344
3345 switch (c) {
3346 case '"':
3347 ret = lttng_metadata_printf(session,
3348 "\\\"");
3349 break;
3350 case '\\':
3351 ret = lttng_metadata_printf(session,
3352 "\\\\");
3353 break;
3354 default:
3355 ret = lttng_metadata_printf(session,
3356 "%c", c);
3357 break;
3358 }
3359 if (ret)
3360 goto end;
3361 }
08ad1061
PP		 3362 ret = lttng_metadata_printf(session, "\"");
3363 if (ret)
3364 goto end;
3365
3366 if (entry->options.is_auto) {
3367 ret = lttng_metadata_printf(session, ",\n");
3368 if (ret)
3369 goto end;
141ddf28 3370 } else {
7c559490
MD		 3371 ret = lttng_metadata_printf(session,
3372 " = ");
3373 if (ret)
3374 goto end;
3375 if (entry->start.signedness)
141ddf28 3376 ret = lttng_metadata_printf(session,
7c559490
MD		 3377 "%lld", (long long) entry->start.value);
3378 else
3379 ret = lttng_metadata_printf(session,
3380 "%llu", entry->start.value);
3381 if (ret)
3382 goto end;
3383 if (entry->start.signedness == entry->end.signedness &&
3384 entry->start.value
3385 == entry->end.value) {
141ddf28 3386 ret = lttng_metadata_printf(session,
7c559490
MD		 3387 ",\n");
3388 } else {
3389 if (entry->end.signedness) {
3390 ret = lttng_metadata_printf(session,
3391 " ... %lld,\n",
3392 (long long) entry->end.value);
3393 } else {
3394 ret = lttng_metadata_printf(session,
3395 " ... %llu,\n",
3396 entry->end.value);
3397 }
141ddf28 3398 }
7c559490
MD		 3399 if (ret)
3400 goto end;
141ddf28 3401 }
141ddf28
MD		 3402 }
3403 ret = print_tabs(session, nesting);
3404 if (ret)
3405 goto end;
ceabb767 3406 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3407end:
3408 return ret;
3409}
3410
d83004aa
JD		 3411/*
3412 * Must be called with sessions_mutex held.
3413 */
c099397a 3414static
ceabb767 3415int _lttng_enum_field_statedump(struct lttng_session *session,
437d5aa5 3416 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3417 size_t nesting)
3418{
3419 int ret;
437d5aa5 3420 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3421
437d5aa5
MD		 3422 enum_type = lttng_kernel_get_type_enum(field->type);
3423 WARN_ON_ONCE(!enum_type);
3424 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3425 if (ret)
3426 return ret;
3427 return lttng_field_name_statedump(session, field, nesting);
3428}
3429
3430static
3431int _lttng_integer_field_statedump(struct lttng_session *session,
437d5aa5 3432 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3433 size_t nesting)
3434{
3435 int ret;
3436
437d5aa5
MD		 3437 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3438 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3439 if (ret)
3440 return ret;
3441 return lttng_field_name_statedump(session, field, nesting);
3442}
3443
3444static
3445int _lttng_string_type_statedump(struct lttng_session *session,
437d5aa5 3446 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3447 size_t nesting)
3448{
3449 int ret;
3450
ceabb767
MD		 3451 /* Default encoding is UTF8 */
3452 ret = print_tabs(session, nesting);
3453 if (ret)
3454 return ret;
3455 ret = lttng_metadata_printf(session,
3456 "string%s",
437d5aa5 3457 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3458 " { encoding = ASCII; }" : "");
3459 return ret;
3460}
3461
3462static
3463int _lttng_string_field_statedump(struct lttng_session *session,
437d5aa5 3464 const struct lttng_kernel_event_field *field,
f513b2bf 3465 size_t nesting)
ceabb767 3466{
437d5aa5 3467 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3468 int ret;
3469
437d5aa5
MD		 3470 string_type = lttng_kernel_get_type_string(field->type);
3471 WARN_ON_ONCE(!string_type);
3472 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3473 if (ret)
3474 return ret;
3475 return lttng_field_name_statedump(session, field, nesting);
3476}
3477
3478/*
3479 * Must be called with sessions_mutex held.
3480 */
3481static
3482int _lttng_type_statedump(struct lttng_session *session,
437d5aa5
MD		 3483 const struct lttng_kernel_type_common *type,
3484 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3485 size_t nesting)
c099397a 3486{
c099397a 3487 int ret = 0;
c099397a 3488
12bb2edb
MD		 3489 switch (type->type) {
3490 case lttng_kernel_type_integer:
437d5aa5
MD		 3491 ret = _lttng_integer_type_statedump(session,
3492 lttng_kernel_get_type_integer(type),
3493 parent_encoding, nesting);
8070f5c0 3494 break;
437d5aa5
MD		 3495 case lttng_kernel_type_enum:
3496 ret = _lttng_enum_type_statedump(session,
3497 lttng_kernel_get_type_enum(type),
3498 nesting);
8070f5c0 3499 break;
12bb2edb 3500 case lttng_kernel_type_string:
437d5aa5
MD		 3501 ret = _lttng_string_type_statedump(session,
3502 lttng_kernel_get_type_string(type),
3503 nesting);
ceabb767 3504 break;
437d5aa5
MD		 3505 case lttng_kernel_type_struct:
3506 ret = _lttng_struct_type_statedump(session,
3507 lttng_kernel_get_type_struct(type),
3508 nesting);
8070f5c0 3509 break;
437d5aa5
MD		 3510 case lttng_kernel_type_variant:
3511 ret = _lttng_variant_type_statedump(session,
3512 lttng_kernel_get_type_variant(type),
3513 nesting);
ceabb767
MD		 3514 break;
3515
3516 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3517 case lttng_kernel_type_array:
3518 case lttng_kernel_type_sequence:
ceabb767
MD		 3519 default:
3520 WARN_ON_ONCE(1);
3521 return -EINVAL;
8070f5c0 3522 }
ceabb767
MD		 3523 return ret;
3524}
8070f5c0 3525
ceabb767
MD		 3526/*
3527 * Must be called with sessions_mutex held.
3528 */
3529static
3530int _lttng_field_statedump(struct lttng_session *session,
437d5aa5 3531 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3532 size_t nesting)
3533{
3534 int ret = 0;
27d2368e 3535
437d5aa5 3536 switch (field->type->type) {
12bb2edb 3537 case lttng_kernel_type_integer:
ceabb767
MD		 3538 ret = _lttng_integer_field_statedump(session, field, nesting);
3539 break;
437d5aa5 3540 case lttng_kernel_type_enum:
ceabb767 3541 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3542 break;
12bb2edb 3543 case lttng_kernel_type_string:
ceabb767 3544 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3545 break;
437d5aa5 3546 case lttng_kernel_type_struct:
ceabb767 3547 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3548 break;
437d5aa5 3549 case lttng_kernel_type_array:
ceabb767 3550 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3551 break;
437d5aa5 3552 case lttng_kernel_type_sequence:
ceabb767 3553 ret = _lttng_sequence_field_statedump(session, field, nesting);
f513b2bf 3554 break;
437d5aa5 3555 case lttng_kernel_type_variant:
ceabb767 3556 ret = _lttng_variant_field_statedump(session, field, nesting);
65c85aa6 3557 break;
f513b2bf 3558
8070f5c0
MD		 3559 default:
3560 WARN_ON_ONCE(1);
3561 return -EINVAL;
3562 }
3563 return ret;
3564}
3565
3566static
a90917c3 3567int _lttng_context_metadata_statedump(struct lttng_session *session,
437d5aa5 3568 struct lttng_kernel_ctx *ctx)
8070f5c0
MD		 3569{
3570 int ret = 0;
3571 int i;
3572
3573 if (!ctx)
3574 return 0;
3575 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3576 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3577
437d5aa5 3578 ret = _lttng_field_statedump(session, field->event_field, 2);
8070f5c0
MD		 3579 if (ret)
3580 return ret;
3581 }
3582 return ret;
3583}
3584
3585static
a90917c3 3586int _lttng_fields_metadata_statedump(struct lttng_session *session,
a67ba386 3587 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3588{
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
f513b2bf 3596 ret = _lttng_field_statedump(session, field, 2);
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
This page took 0.307991 seconds and 4 git commands to generate.