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Refactoring: event create: introduce _lttng_event_recorder_metadata_statedump
[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
c190d76e 31#include <wrapper/compiler_attributes.h>
a7008254 32#include <wrapper/uuid.h>
263b6c88 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 34#include <wrapper/random.h>
35#include <wrapper/tracepoint.h>
36#include <wrapper/list.h>
cbc19040 37#include <wrapper/types.h>
2df37e95
MD		 38#include <lttng/kernel-version.h>
39#include <lttng/events.h>
92bc1e23 40#include <lttng/events-internal.h>
0b365677 41#include <lttng/lttng-bytecode.h>
2df37e95 42#include <lttng/tracer.h>
21f58fb7 43#include <lttng/event-notifier-notification.h>
2df37e95
MD		 44#include <lttng/abi-old.h>
45#include <lttng/endian.h>
46#include <lttng/string-utils.h>
4a11ef1c 47#include <lttng/utils.h>
24591303
MD		 48#include <ringbuffer/backend.h>
49#include <ringbuffer/frontend.h>
3636085f 50#include <wrapper/time.h>
4e3c1b9b 51
d83004aa
JD		 52#define METADATA_CACHE_DEFAULT_SIZE 4096
53
4e3c1b9b 54static LIST_HEAD(sessions);
750b05f2 55static LIST_HEAD(event_notifier_groups);
a90917c3 56static LIST_HEAD(lttng_transport_list);
a101fa10 57static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 58/*
59 * Protect the sessions and metadata caches.
60 */
4e3c1b9b 61static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 62static struct kmem_cache *event_recorder_cache;
63static struct kmem_cache *event_recorder_private_cache;
dffef45d 64static struct kmem_cache *event_notifier_cache;
a67ba386 65static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 66
8cdc1a81
MD		 67static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
68static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b01155ba 69static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
7b25ab0e 70static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
3c997079 71
0648898e 72static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
f7d06400 73static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
f0bcc14c 74static int _lttng_event_unregister(struct lttng_kernel_event_common *event);
c099397a 75static
ee7e9a18 76int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event);
c099397a 77static
8cdc1a81 78int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 79static
80void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 81static
8cdc1a81 82int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 83 const struct lttng_kernel_type_common *type,
84 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 85 size_t nesting);
86static
8cdc1a81 87int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 88 const struct lttng_kernel_event_field *field,
51ef4536 89 size_t nesting, const char **prev_field_name_p);
c099397a 90
c099397a 91void synchronize_trace(void)
abcca994 92{
05355f0b
MJ		 93#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
94 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 95 synchronize_rcu();
96#else
abcca994 97 synchronize_sched();
92da05ce
MJ		 98#endif
99
5f4c791e 100#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 101#ifdef CONFIG_PREEMPT_RT_FULL
102 synchronize_rcu();
103#endif
5f4c791e 104#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 105#ifdef CONFIG_PREEMPT_RT
106 synchronize_rcu();
107#endif
5f4c791e 108#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 109}
110
3c997079
MD		 111void lttng_lock_sessions(void)
112{
113 mutex_lock(&sessions_mutex);
114}
115
116void lttng_unlock_sessions(void)
117{
118 mutex_unlock(&sessions_mutex);
119}
120
9fe593d2
FD		 121static struct lttng_transport *lttng_transport_find(const char *name)
122{
123 struct lttng_transport *transport;
124
125 list_for_each_entry(transport, &lttng_transport_list, node) {
126 if (!strcmp(transport->name, name))
127 return transport;
128 }
129 return NULL;
130}
131
3c997079
MD		 132/*
133 * Called with sessions lock held.
134 */
135int lttng_session_active(void)
136{
8cdc1a81 137 struct lttng_kernel_session_private *iter;
3c997079
MD		 138
139 list_for_each_entry(iter, &sessions, list) {
8cdc1a81 140 if (iter->pub->active)
3c997079
MD		 141 return 1;
142 }
143 return 0;
144}
145
8cdc1a81 146struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 147{
8cdc1a81
MD		 148 struct lttng_kernel_session *session;
149 struct lttng_kernel_session_private *session_priv;
d83004aa 150 struct lttng_metadata_cache *metadata_cache;
3c997079 151 int i;
4e3c1b9b
MD		 152
153 mutex_lock(&sessions_mutex);
8cdc1a81 154 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 155 if (!session)
d83004aa 156 goto err;
8cdc1a81
MD		 157 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
158 if (!session_priv)
159 goto err_free_session;
160 session->priv = session_priv;
161 session_priv->pub = session;
162
163 INIT_LIST_HEAD(&session_priv->chan);
164 INIT_LIST_HEAD(&session_priv->events);
165 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 166
167 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
168 GFP_KERNEL);
169 if (!metadata_cache)
8cdc1a81 170 goto err_free_session_private;
0ca42eb7 171 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 172 if (!metadata_cache->data)
173 goto err_free_cache;
174 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
175 kref_init(&metadata_cache->refcount);
92d9f5e6 176 mutex_init(&metadata_cache->lock);
8cdc1a81 177 session_priv->metadata_cache = metadata_cache;
d83004aa 178 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
8cdc1a81 179 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 180 sizeof(metadata_cache->uuid));
8cdc1a81 181 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 182 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
8cdc1a81
MD		 183 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
184 list_add(&session_priv->list, &sessions);
185
8c0393c3
MD		 186 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
187 goto tracker_alloc_error;
188 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
189 goto tracker_alloc_error;
190 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
191 goto tracker_alloc_error;
192 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
193 goto tracker_alloc_error;
194 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
195 goto tracker_alloc_error;
196 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
197 goto tracker_alloc_error;
198
4e3c1b9b 199 mutex_unlock(&sessions_mutex);
8cdc1a81 200
4e3c1b9b 201 return session;
d83004aa 202
8c0393c3
MD		 203tracker_alloc_error:
204 lttng_id_tracker_fini(&session->pid_tracker);
205 lttng_id_tracker_fini(&session->vpid_tracker);
206 lttng_id_tracker_fini(&session->uid_tracker);
207 lttng_id_tracker_fini(&session->vuid_tracker);
208 lttng_id_tracker_fini(&session->gid_tracker);
209 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 210err_free_cache:
211 kfree(metadata_cache);
8cdc1a81
MD		 212err_free_session_private:
213 lttng_kvfree(session_priv);
d83004aa 214err_free_session:
48f5e0b5 215 lttng_kvfree(session);
d83004aa
JD		 216err:
217 mutex_unlock(&sessions_mutex);
218 return NULL;
219}
220
99f52fcc
FD		 221static
222struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
223{
224 struct lttng_counter_transport *transport;
225
226 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
227 if (!strcmp(transport->name, name))
228 return transport;
229 }
230 return NULL;
231}
232
233struct lttng_counter *lttng_kernel_counter_create(
234 const char *counter_transport_name,
235 size_t number_dimensions, const size_t *dimensions_sizes)
236{
237 struct lttng_counter *counter = NULL;
238 struct lttng_counter_transport *counter_transport = NULL;
239
240 counter_transport = lttng_counter_transport_find(counter_transport_name);
241 if (!counter_transport) {
242 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
243 counter_transport_name);
244 goto notransport;
245 }
246 if (!try_module_get(counter_transport->owner)) {
247 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
248 goto notransport;
249 }
250
251 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
252 if (!counter)
253 goto nomem;
254
255 /* Create event notifier error counter. */
256 counter->ops = &counter_transport->ops;
257 counter->transport = counter_transport;
258
259 counter->counter = counter->ops->counter_create(
260 number_dimensions, dimensions_sizes, 0);
261 if (!counter->counter) {
262 goto create_error;
263 }
264
265 return counter;
266
267create_error:
268 lttng_kvfree(counter);
269nomem:
270 if (counter_transport)
271 module_put(counter_transport->owner);
272notransport:
273 return NULL;
274}
275
750b05f2
FD		 276struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
277{
278 struct lttng_transport *transport = NULL;
279 struct lttng_event_notifier_group *event_notifier_group;
280 const char *transport_name = "relay-event-notifier";
281 size_t subbuf_size = 4096; //TODO
282 size_t num_subbuf = 16; //TODO
283 unsigned int switch_timer_interval = 0;
284 unsigned int read_timer_interval = 0;
dffef45d 285 int i;
750b05f2
FD		 286
287 mutex_lock(&sessions_mutex);
288
289 transport = lttng_transport_find(transport_name);
290 if (!transport) {
291 printk(KERN_WARNING "LTTng: transport %s not found\n",
292 transport_name);
293 goto notransport;
294 }
295 if (!try_module_get(transport->owner)) {
296 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
297 transport_name);
298 goto notransport;
299 }
300
301 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
302 GFP_KERNEL);
303 if (!event_notifier_group)
304 goto nomem;
305
306 /*
307 * Initialize the ring buffer used to store event notifier
308 * notifications.
309 */
310 event_notifier_group->ops = &transport->ops;
4a399b76 311 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 312 transport_name, event_notifier_group, NULL,
313 subbuf_size, num_subbuf, switch_timer_interval,
314 read_timer_interval);
315 if (!event_notifier_group->chan)
316 goto create_error;
317
318 event_notifier_group->transport = transport;
dffef45d
FD		 319
320 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
321 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
33af697f
MD		 322 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
323 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
dffef45d 324
750b05f2
FD		 325 list_add(&event_notifier_group->node, &event_notifier_groups);
326
327 mutex_unlock(&sessions_mutex);
328
329 return event_notifier_group;
330
331create_error:
332 lttng_kvfree(event_notifier_group);
333nomem:
334 if (transport)
335 module_put(transport->owner);
336notransport:
337 mutex_unlock(&sessions_mutex);
338 return NULL;
339}
340
d83004aa
JD		 341void metadata_cache_destroy(struct kref *kref)
342{
343 struct lttng_metadata_cache *cache =
344 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 345 vfree(cache->data);
d83004aa 346 kfree(cache);
4e3c1b9b
MD		 347}
348
8cdc1a81 349void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 350{
f7d06400 351 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 352 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 353 struct lttng_metadata_stream *metadata_stream;
09710b83 354 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
dda6a249 355 int ret;
4e3c1b9b
MD		 356
357 mutex_lock(&sessions_mutex);
a8f2d0c7 358 WRITE_ONCE(session->active, 0);
f7d06400 359 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 360 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 361 WARN_ON(ret);
362 }
f237aef8 363 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
f0bcc14c 364 ret = _lttng_event_unregister(&event_recorder_priv->pub->parent);
dda6a249
MD		 365 WARN_ON(ret);
366 }
abcca994 367 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400 368 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 369 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
badfe9f5
MD		 370 WARN_ON(ret);
371 }
09710b83
MD		 372 list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node)
373 lttng_event_enabler_destroy(event_enabler);
f237aef8 374 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node)
0648898e 375 _lttng_event_destroy(&event_recorder_priv->pub->parent);
f7d06400
MD		 376 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
377 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
378 _lttng_channel_destroy(chan_priv->pub);
d83004aa 379 }
8cdc1a81
MD		 380 mutex_lock(&session->priv->metadata_cache->lock);
381 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
d83004aa 382 _lttng_metadata_channel_hangup(metadata_stream);
8cdc1a81 383 mutex_unlock(&session->priv->metadata_cache->lock);
8c0393c3
MD		 384 lttng_id_tracker_fini(&session->pid_tracker);
385 lttng_id_tracker_fini(&session->vpid_tracker);
386 lttng_id_tracker_fini(&session->uid_tracker);
387 lttng_id_tracker_fini(&session->vuid_tracker);
388 lttng_id_tracker_fini(&session->gid_tracker);
389 lttng_id_tracker_fini(&session->vgid_tracker);
8cdc1a81
MD		 390 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
391 list_del(&session->priv->list);
4e3c1b9b 392 mutex_unlock(&sessions_mutex);
8cdc1a81 393 lttng_kvfree(session->priv);
48f5e0b5 394 lttng_kvfree(session);
4e3c1b9b
MD		 395}
396
dffef45d
FD		 397void lttng_event_notifier_group_destroy(
398 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 399{
09710b83 400 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
a67ba386 401 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 402 int ret;
403
750b05f2
FD		 404 if (!event_notifier_group)
405 return;
406
407 mutex_lock(&sessions_mutex);
dffef45d 408
6053e75e 409 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
8a8ac9a8
FD		 410 WARN_ON(ret);
411
a67ba386 412 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 413 &event_notifier_group->event_notifiers_head, parent.node) {
f0bcc14c 414 ret = _lttng_event_unregister(&event_notifier_priv->pub->parent);
dffef45d
FD		 415 WARN_ON(ret);
416 }
417
b01155ba
FD		 418 /* Wait for in-flight event notifier to complete */
419 synchronize_trace();
420
21f58fb7
FD		 421 irq_work_sync(&event_notifier_group->wakeup_pending);
422
6053e75e
MD		 423 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
424 WARN_ON(ret);
8a8ac9a8 425
09710b83 426 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
dffef45d 427 &event_notifier_group->enablers_head, node)
09710b83 428 lttng_event_enabler_destroy(event_enabler);
dffef45d 429
a67ba386 430 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 431 &event_notifier_group->event_notifiers_head, parent.node)
0648898e 432 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 433
99f52fcc
FD		 434 if (event_notifier_group->error_counter) {
435 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 436
99f52fcc
FD		 437 error_counter->ops->counter_destroy(error_counter->counter);
438 module_put(error_counter->transport->owner);
439 lttng_kvfree(error_counter);
440 event_notifier_group->error_counter = NULL;
441 }
442
4a399b76 443 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 444 module_put(event_notifier_group->transport->owner);
445 list_del(&event_notifier_group->node);
dffef45d 446
750b05f2
FD		 447 mutex_unlock(&sessions_mutex);
448 lttng_kvfree(event_notifier_group);
449}
450
8cdc1a81 451int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 452{
453 int ret;
454
455 mutex_lock(&sessions_mutex);
456 ret = lttng_statedump_start(session);
457 mutex_unlock(&sessions_mutex);
458 return ret;
459}
460
8cdc1a81 461int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 462{
463 int ret = 0;
f7d06400 464 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 465
466 mutex_lock(&sessions_mutex);
467 if (session->active) {
468 ret = -EBUSY;
469 goto end;
470 }
c099397a 471
3c997079 472 /* Set transient enabler state to "enabled" */
8cdc1a81 473 session->priv->tstate = 1;
3c997079 474
4ef81e4a 475 /* We need to sync enablers with session before activation. */
b2bc0bc8 476 lttng_session_sync_event_enablers(session);
4ef81e4a 477
c099397a
MD		 478 /*
479 * Snapshot the number of events per channel to know the type of header
480 * we need to use.
481 */
f7d06400
MD		 482 list_for_each_entry(chan_priv, &session->priv->chan, node) {
483 if (chan_priv->header_type)
484 continue; /* don't change it if session stop/restart */
485 if (chan_priv->free_event_id < 31)
486 chan_priv->header_type = 1; /* compact */
c099397a 487 else
f7d06400 488 chan_priv->header_type = 2; /* large */
c099397a
MD		 489 }
490
64af2437 491 /* Clear each stream's quiescent state. */
f7d06400
MD		 492 list_for_each_entry(chan_priv, &session->priv->chan, node) {
493 if (chan_priv->channel_type != METADATA_CHANNEL)
494 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 495 }
64af2437 496
a8f2d0c7 497 WRITE_ONCE(session->active, 1);
8cdc1a81 498 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 499 ret = _lttng_session_metadata_statedump(session);
c337ddc2 500 if (ret) {
a8f2d0c7 501 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 502 goto end;
503 }
504 ret = lttng_statedump_start(session);
360f38ea 505 if (ret)
a8f2d0c7 506 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 507end:
508 mutex_unlock(&sessions_mutex);
11b5a3c2 509 return ret;
c0e31d2e
MD		 510}
511
8cdc1a81 512int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 513{
514 int ret = 0;
f7d06400 515 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 516
517 mutex_lock(&sessions_mutex);
518 if (!session->active) {
519 ret = -EBUSY;
520 goto end;
521 }
a8f2d0c7 522 WRITE_ONCE(session->active, 0);
3c997079
MD		 523
524 /* Set transient enabler state to "disabled" */
8cdc1a81 525 session->priv->tstate = 0;
b2bc0bc8 526 lttng_session_sync_event_enablers(session);
64af2437
MD		 527
528 /* Set each stream's quiescent state. */
f7d06400
MD		 529 list_for_each_entry(chan_priv, &session->priv->chan, node) {
530 if (chan_priv->channel_type != METADATA_CHANNEL)
531 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 532 }
c0e31d2e
MD		 533end:
534 mutex_unlock(&sessions_mutex);
11b5a3c2 535 return ret;
c0e31d2e
MD		 536}
537
8cdc1a81 538int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 539{
540 int ret = 0;
f7d06400 541 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 542 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 543 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 544 struct lttng_metadata_stream *stream;
545
546 mutex_lock(&sessions_mutex);
547 if (!session->active) {
548 ret = -EBUSY;
549 goto end;
550 }
551
552 mutex_lock(&cache->lock);
553 memset(cache->data, 0, cache->cache_alloc);
554 cache->metadata_written = 0;
555 cache->version++;
8cdc1a81 556 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 557 stream->metadata_out = 0;
558 stream->metadata_in = 0;
559 }
560 mutex_unlock(&cache->lock);
561
8cdc1a81 562 session->priv->metadata_dumped = 0;
f7d06400
MD		 563 list_for_each_entry(chan_priv, &session->priv->chan, node) {
564 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 565 }
566
f237aef8 567 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386 568 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 569 }
570
571 ret = _lttng_session_metadata_statedump(session);
572
573end:
574 mutex_unlock(&sessions_mutex);
575 return ret;
576}
577
6b757027
MD		 578static
579bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
580{
581 struct lttng_kernel_channel_buffer *chan_buf;
582
583 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
584 return false;
585 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
586 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
587 return true;
588 return false;
589}
590
591int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
e64957da 592{
3c997079 593 int ret = 0;
e64957da 594
3c997079 595 mutex_lock(&sessions_mutex);
6b757027 596 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 597 ret = -EPERM;
598 goto end;
599 }
6b757027 600 if (channel->enabled) {
3c997079
MD		 601 ret = -EEXIST;
602 goto end;
603 }
604 /* Set transient enabler state to "enabled" */
6b757027
MD		 605 channel->priv->tstate = 1;
606 lttng_session_sync_event_enablers(channel->session);
3c997079 607 /* Set atomically the state to "enabled" */
6b757027 608 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 609end:
610 mutex_unlock(&sessions_mutex);
611 return ret;
e64957da
MD		 612}
613
6b757027 614int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
e64957da 615{
3c997079 616 int ret = 0;
e64957da 617
3c997079 618 mutex_lock(&sessions_mutex);
6b757027 619 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 620 ret = -EPERM;
621 goto end;
622 }
6b757027 623 if (!channel->enabled) {
3c997079
MD		 624 ret = -EEXIST;
625 goto end;
626 }
627 /* Set atomically the state to "disabled" */
6b757027 628 WRITE_ONCE(channel->enabled, 0);
3c997079 629 /* Set transient enabler state to "enabled" */
6b757027
MD		 630 channel->priv->tstate = 0;
631 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 632end:
633 mutex_unlock(&sessions_mutex);
634 return ret;
e64957da
MD		 635}
636
9d993668 637int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 638{
3c997079 639 int ret = 0;
e64957da 640
3c997079 641 mutex_lock(&sessions_mutex);
9d993668
MD		 642 switch (event->type) {
643 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
644 {
645 struct lttng_kernel_event_recorder *event_recorder =
646 container_of(event, struct lttng_kernel_event_recorder, parent);
647
f7d06400 648 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 649 ret = -EPERM;
650 goto end;
651 }
a0493bef 652 break;
9d993668
MD		 653 }
654 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
655 switch (event->priv->instrumentation) {
656 case LTTNG_KERNEL_ABI_KRETPROBE:
657 ret = -EINVAL;
658 goto end;
659 default:
660 break;
661 }
a0493bef
MD		 662 break;
663 default:
9d993668 664 break;
a0493bef 665 }
e64957da 666
9d993668 667 if (event->enabled) {
3c997079
MD		 668 ret = -EEXIST;
669 goto end;
670 }
a67ba386 671 switch (event->priv->instrumentation) {
c190d76e
MJ		 672 case LTTNG_KERNEL_ABI_TRACEPOINT:
673 lttng_fallthrough;
606828e4 674 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 675 ret = -EINVAL;
676 break;
b4a75708 677
c190d76e
MJ		 678 case LTTNG_KERNEL_ABI_KPROBE:
679 lttng_fallthrough;
606828e4 680 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 681 WRITE_ONCE(event->enabled, 1);
a0493bef 682 break;
b4a75708 683
606828e4 684 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 685 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 686 break;
b4a75708 687
c190d76e
MJ		 688 case LTTNG_KERNEL_ABI_FUNCTION:
689 lttng_fallthrough;
690 case LTTNG_KERNEL_ABI_NOOP:
691 lttng_fallthrough;
a0493bef
MD		 692 default:
693 WARN_ON_ONCE(1);
694 ret = -EINVAL;
695 }
3c997079
MD		 696end:
697 mutex_unlock(&sessions_mutex);
698 return ret;
e64957da
MD		 699}
700
9d993668 701int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 702{
703 int ret = 0;
704
705 mutex_lock(&sessions_mutex);
9d993668
MD		 706 switch (event->type) {
707 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
708 {
709 struct lttng_kernel_event_recorder *event_recorder =
710 container_of(event, struct lttng_kernel_event_recorder, parent);
711
f7d06400 712 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 713 ret = -EPERM;
714 goto end;
715 }
b01155ba 716 break;
9d993668
MD		 717 }
718 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
719 switch (event->priv->instrumentation) {
720 case LTTNG_KERNEL_ABI_KRETPROBE:
721 ret = -EINVAL;
722 goto end;
723 default:
724 break;
725 }
2b16f0c9 726 break;
dffef45d 727 default:
9d993668 728 break;
dffef45d 729 }
dffef45d 730
a67ba386 731 if (!event->enabled) {
dffef45d
FD		 732 ret = -EEXIST;
733 goto end;
734 }
a67ba386 735 switch (event->priv->instrumentation) {
c190d76e
MJ		 736 case LTTNG_KERNEL_ABI_TRACEPOINT:
737 lttng_fallthrough;
606828e4 738 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 739 ret = -EINVAL;
740 break;
b4a75708 741
c190d76e
MJ		 742 case LTTNG_KERNEL_ABI_KPROBE:
743 lttng_fallthrough;
606828e4 744 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 745 WRITE_ONCE(event->enabled, 0);
2b16f0c9 746 break;
b4a75708 747
9d993668
MD		 748 case LTTNG_KERNEL_ABI_KRETPROBE:
749 ret = lttng_kretprobes_event_enable_state(event, 0);
750 break;
751
c190d76e
MJ		 752 case LTTNG_KERNEL_ABI_FUNCTION:
753 lttng_fallthrough;
754 case LTTNG_KERNEL_ABI_NOOP:
755 lttng_fallthrough;
dffef45d
FD		 756 default:
757 WARN_ON_ONCE(1);
758 ret = -EINVAL;
759 }
760end:
761 mutex_unlock(&sessions_mutex);
762 return ret;
763}
764
4e252d1e 765struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 766 const char *transport_name,
767 void *buf_addr,
4e3c1b9b
MD		 768 size_t subbuf_size, size_t num_subbuf,
769 unsigned int switch_timer_interval,
d83004aa
JD		 770 unsigned int read_timer_interval,
771 enum channel_type channel_type)
4e3c1b9b 772{
f7d06400
MD		 773 struct lttng_kernel_channel_buffer *chan;
774 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 775 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 776
777 mutex_lock(&sessions_mutex);
8cdc1a81 778 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 779 goto active; /* Refuse to add channel to active session */
a90917c3 780 transport = lttng_transport_find(transport_name);
f3d01b96 781 if (!transport) {
5a15f70c 782 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 783 transport_name);
c0e31d2e 784 goto notransport;
f3d01b96 785 }
a33c9927 786 if (!try_module_get(transport->owner)) {
5a15f70c 787 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 788 goto notransport;
789 }
f7d06400 790 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 791 if (!chan)
c0e31d2e 792 goto nomem;
f7d06400
MD		 793 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
794 if (!chan_priv)
795 goto nomem_priv;
796 chan->priv = chan_priv;
797 chan_priv->pub = chan;
798 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
799 chan->parent.session = session;
800 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 801 chan->ops = &transport->ops;
125b4df4
MD		 802 /*
803 * Note: the channel creation op already writes into the packet
804 * headers. Therefore the "chan" information used as input
805 * should be already accessible.
806 */
f7d06400 807 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 808 chan, buf_addr, subbuf_size, num_subbuf,
809 switch_timer_interval, read_timer_interval);
f7d06400 810 if (!chan->priv->rb_chan)
f3d01b96 811 goto create_error;
f7d06400
MD		 812 chan->priv->parent.tstate = 1;
813 chan->parent.enabled = 1;
814 chan->priv->transport = transport;
815 chan->priv->channel_type = channel_type;
816 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 817 mutex_unlock(&sessions_mutex);
818 return chan;
819
f3d01b96 820create_error:
f7d06400
MD		 821 kfree(chan_priv);
822nomem_priv:
f3d01b96 823 kfree(chan);
c0e31d2e 824nomem:
a33c9927
MD		 825 if (transport)
826 module_put(transport->owner);
c0e31d2e 827notransport:
e5382b6d 828active:
4e3c1b9b
MD		 829 mutex_unlock(&sessions_mutex);
830 return NULL;
831}
832
833/*
d83004aa
JD		 834 * Only used internally at session destruction for per-cpu channels, and
835 * when metadata channel is released.
836 * Needs to be called with sessions mutex held.
4e3c1b9b 837 */
aa7c23a9 838static
f7d06400 839void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 840{
f7d06400
MD		 841 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
842 module_put(chan->priv->transport->owner);
843 list_del(&chan->priv->node);
844 lttng_kernel_destroy_context(chan->priv->ctx);
845 kfree(chan->priv);
4e3c1b9b
MD		 846 kfree(chan);
847}
848
f7d06400 849void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 850{
f7d06400 851 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 852
853 /* Protect the metadata cache with the sessions_mutex. */
854 mutex_lock(&sessions_mutex);
855 _lttng_channel_destroy(chan);
856 mutex_unlock(&sessions_mutex);
857}
858EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
859
860static
861void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
862{
863 stream->finalized = 1;
864 wake_up_interruptible(&stream->read_wait);
865}
866
756a020c
MD		 867static
868struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler)
869{
870 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
871 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
872
873 switch (event_enabler->enabler_type) {
874 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
875 {
876 struct lttng_event_recorder_enabler *event_recorder_enabler =
877 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
878 struct lttng_kernel_event_recorder *event_recorder;
879 struct lttng_kernel_event_recorder_private *event_recorder_priv;
880 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
881
882 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
883 if (!event_recorder)
884 return NULL;
885 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
886 if (!event_recorder_priv) {
887 kmem_cache_free(event_recorder_private_cache, event_recorder);
888 return NULL;
889 }
890 event_recorder_priv->pub = event_recorder;
891 event_recorder_priv->parent.pub = &event_recorder->parent;
892 event_recorder->priv = event_recorder_priv;
893 event_recorder->parent.priv = &event_recorder_priv->parent;
894
895 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
896 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
897 event_recorder->priv->parent.instrumentation = itype;
898 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
899 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
900
901 event_recorder->chan = chan;
902 event_recorder->priv->id = chan->priv->free_event_id++;
903 return &event_recorder->parent;
904 }
905 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
906 {
907 struct lttng_event_notifier_enabler *event_notifier_enabler =
908 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
909 struct lttng_kernel_event_notifier *event_notifier;
910 struct lttng_kernel_event_notifier_private *event_notifier_priv;
911
912 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
913 if (!event_notifier)
914 return NULL;
915 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
916 if (!event_notifier_priv) {
917 kmem_cache_free(event_notifier_private_cache, event_notifier);
918 return NULL;
919 }
920 event_notifier_priv->pub = event_notifier;
921 event_notifier_priv->parent.pub = &event_notifier->parent;
922 event_notifier->priv = event_notifier_priv;
923 event_notifier->parent.priv = &event_notifier_priv->parent;
924
925 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
926 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
927 event_notifier->priv->parent.instrumentation = itype;
928 event_notifier->priv->parent.user_token = event_enabler->user_token;
929 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
930 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
931
932 event_notifier->priv->group = event_notifier_enabler->group;
933 event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index;
934 event_notifier->priv->num_captures = 0;
935 event_notifier->notification_send = lttng_event_notifier_notification_send;
936 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
937 return &event_notifier->parent;
938 }
939 default:
940 return NULL;
941 }
942}
943
944static
945void lttng_kernel_event_free(struct lttng_kernel_event_common *event)
946{
947 switch (event->type) {
948 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
949 {
950 struct lttng_kernel_event_recorder *event_recorder =
951 container_of(event, struct lttng_kernel_event_recorder, parent);
952
953 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
954 kmem_cache_free(event_recorder_cache, event_recorder);
955 break;
956 }
957 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
958 {
959 struct lttng_kernel_event_notifier *event_notifier =
960 container_of(event, struct lttng_kernel_event_notifier, parent);
961
962 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
963 kmem_cache_free(event_notifier_cache, event_notifier);
964 break;
965 }
966 default:
967 WARN_ON_ONCE(1);
968 }
969}
a101fa10 970
ccefc7ab
MD		 971static
972int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event)
973{
974 switch (event->type) {
975 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
976 return 0;
977 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
978 {
979 struct lttng_kernel_event_notifier *event_notifier =
980 container_of(event, struct lttng_kernel_event_notifier, parent);
981 struct lttng_counter *error_counter;
982 struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group;
983 size_t dimension_index[1];
984 int ret;
985
986 /*
987 * Clear the error counter bucket. The sessiond keeps track of which
988 * bucket is currently in use. We trust it. The session lock
989 * synchronizes against concurrent creation of the error
990 * counter.
991 */
992 error_counter = event_notifier_group->error_counter;
993 if (!error_counter)
994 return 0;
995 /*
996 * Check that the index is within the boundary of the counter.
997 */
998 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
999 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1000 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1001 return -EINVAL;
1002 }
1003
1004 dimension_index[0] = event_notifier->priv->error_counter_index;
1005 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1006 if (ret) {
1007 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1008 event_notifier->priv->error_counter_index);
1009 return -EINVAL;
1010 }
1011 return 0;
1012 }
1013 default:
1014 return -EINVAL;
1015 }
1016}
1017
e5382b6d
MD		 1018/*
1019 * Supports event creation while tracing session is active.
3c997079 1020 * Needs to be called with sessions mutex held.
e5382b6d 1021 */
83006ee0 1022static
1ae083ba 1023struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 1024 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 1025{
0def9170 1026 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
19b98250 1027 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent);
def1e304 1028 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
5b9817ae 1029 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
def1e304 1030 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1031 struct lttng_kernel_event_common_private *event_priv;
756a020c 1032 struct lttng_kernel_event_common *event;
756a020c 1033 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 1034 const char *event_name;
1035 struct hlist_head *head;
3d084699 1036 int ret;
4e3c1b9b 1037
f7d06400 1038 if (chan->priv->free_event_id == -1U) {
4cf0bf51 1039 ret = -EMFILE;
e5382b6d 1040 goto full;
abc0446a 1041 }
3c997079
MD		 1042
1043 switch (itype) {
606828e4 1044 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1045 event_name = event_desc->event_name;
3c997079 1046 break;
b4a75708 1047
c190d76e
MJ		 1048 case LTTNG_KERNEL_ABI_KPROBE:
1049 lttng_fallthrough;
1050 case LTTNG_KERNEL_ABI_UPROBE:
1051 lttng_fallthrough;
1052 case LTTNG_KERNEL_ABI_KRETPROBE:
1053 lttng_fallthrough;
606828e4 1054 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 1055 event_name = event_param->name;
1056 break;
b4a75708 1057
c190d76e
MJ		 1058 case LTTNG_KERNEL_ABI_FUNCTION:
1059 lttng_fallthrough;
1060 case LTTNG_KERNEL_ABI_NOOP:
1061 lttng_fallthrough;
3c997079
MD		 1062 default:
1063 WARN_ON_ONCE(1);
1064 ret = -EINVAL;
1065 goto type_error;
1066 }
4a11ef1c 1067
0def9170 1068 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1069 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
0d223dc6 1070 if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) {
3c997079
MD		 1071 ret = -EEXIST;
1072 goto exist;
abc0446a
MD		 1073 }
1074 }
3c997079 1075
756a020c
MD		 1076 event = lttng_kernel_event_alloc(&event_enabler->parent);
1077 if (!event) {
4cf0bf51 1078 ret = -ENOMEM;
756a020c 1079 goto alloc_error;
abc0446a 1080 }
756a020c 1081 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3c997079
MD		 1082
1083 switch (itype) {
606828e4 1084 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 1085 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1086 event->enabled = 0;
1087 event->priv->registered = 0;
1088 event->priv->desc = lttng_event_desc_get(event_name);
1089 if (!event->priv->desc) {
4cf0bf51 1090 ret = -ENOENT;
d3dbe23c 1091 goto register_error;
abc0446a 1092 }
3c997079
MD		 1093 /* Populate lttng_event structure before event registration. */
1094 smp_wmb();
baf20995 1095 break;
b4a75708 1096
606828e4 1097 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 1098 /*
1099 * Needs to be explicitly enabled after creation, since
1100 * we may want to apply filters.
1101 */
7cd0f696
MD		 1102 event->enabled = 0;
1103 event->priv->registered = 1;
3c997079
MD		 1104 /*
1105 * Populate lttng_event structure before event
1106 * registration.
1107 */
1108 smp_wmb();
8bf17deb 1109 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 1110 event_param->u.kprobe.symbol_name,
1111 event_param->u.kprobe.offset,
1112 event_param->u.kprobe.addr,
7cd0f696 1113 event);
abc0446a 1114 if (ret) {
4cf0bf51 1115 ret = -EINVAL;
d6d808f3 1116 goto register_error;
abc0446a 1117 }
7cd0f696 1118 ret = try_module_get(event->priv->desc->owner);
edeb3137 1119 WARN_ON_ONCE(!ret);
d6d808f3 1120 break;
b4a75708 1121
606828e4 1122 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 1123 {
756a020c 1124 struct lttng_kernel_event_common *event_return;
a67ba386 1125 struct lttng_kernel_event_recorder *event_recorder_return;
7371f44c
MD		 1126
1127 /* kretprobe defines 2 events */
a0493bef
MD		 1128 /*
1129 * Needs to be explicitly enabled after creation, since
1130 * we may want to apply filters.
1131 */
756a020c
MD		 1132 event->enabled = 0;
1133 event->priv->registered = 1;
a67ba386 1134
756a020c
MD		 1135 event_return = lttng_kernel_event_alloc(&event_enabler->parent);
1136 if (!event) {
a67ba386 1137 ret = -ENOMEM;
756a020c 1138 goto alloc_error;
a67ba386 1139 }
756a020c
MD		 1140 event_recorder_return = container_of(event_return, struct lttng_kernel_event_recorder, parent);
1141
1142 event_return->enabled = 0;
1143 event_return->priv->registered = 1;
1144
7371f44c 1145 /*
a90917c3 1146 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1147 */
1148 smp_wmb();
3c997079 1149 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1150 event_param->u.kretprobe.symbol_name,
1151 event_param->u.kretprobe.offset,
1152 event_param->u.kretprobe.addr,
756a020c 1153 event, event_return);
7371f44c 1154 if (ret) {
756a020c 1155 lttng_kernel_event_free(event_return);
4cf0bf51 1156 ret = -EINVAL;
7371f44c
MD		 1157 goto register_error;
1158 }
1159 /* Take 2 refs on the module: one per event. */
756a020c 1160 ret = try_module_get(event->priv->desc->owner);
7371f44c 1161 WARN_ON_ONCE(!ret);
756a020c 1162 ret = try_module_get(event_return->priv->desc->owner);
7371f44c 1163 WARN_ON_ONCE(!ret);
ee7e9a18 1164 ret = _lttng_event_recorder_metadata_statedump(event_return);
abc0446a 1165 WARN_ON_ONCE(ret > 0);
7371f44c 1166 if (ret) {
756a020c 1167 lttng_kernel_event_free(event_return);
7cd0f696
MD		 1168 module_put(event_return->priv->desc->owner);
1169 module_put(event->priv->desc->owner);
7371f44c
MD		 1170 goto statedump_error;
1171 }
19b98250 1172 list_add(&event_return->priv->node, event_list_head);
7371f44c
MD		 1173 break;
1174 }
b4a75708 1175
606828e4 1176 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1177 /*
1178 * Needs to be explicitly enabled after creation, since
1179 * we may want to apply filters.
1180 */
7cd0f696
MD		 1181 event->enabled = 0;
1182 event->priv->registered = 0;
1183 event->priv->desc = event_desc;
badfe9f5 1184 switch (event_param->u.syscall.entryexit) {
606828e4 1185 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1186 ret = -EINVAL;
1187 goto register_error;
606828e4 1188 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1189 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1190 break;
606828e4 1191 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1192 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1193 break;
1194 }
1195 switch (event_param->u.syscall.abi) {
606828e4 1196 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1197 ret = -EINVAL;
1198 goto register_error;
606828e4 1199 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1200 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1201 break;
606828e4 1202 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1203 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1204 break;
1205 }
7cd0f696 1206 if (!event->priv->desc) {
4cf0bf51 1207 ret = -EINVAL;
259b6cb3 1208 goto register_error;
abc0446a 1209 }
1ec65de1 1210 break;
b4a75708 1211
606828e4 1212 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1213 /*
1214 * Needs to be explicitly enabled after creation, since
1215 * we may want to apply filters.
1216 */
7cd0f696
MD		 1217 event->enabled = 0;
1218 event->priv->registered = 1;
3aed4dca 1219
a344f64b
FD		 1220 /*
1221 * Populate lttng_event structure before event
1222 * registration.
1223 */
1224 smp_wmb();
149b9a9d 1225
83b802dc 1226 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1227 event_param->u.uprobe.fd,
7cd0f696 1228 event);
149b9a9d
YB		 1229 if (ret)
1230 goto register_error;
7cd0f696 1231 ret = try_module_get(event->priv->desc->owner);
149b9a9d
YB		 1232 WARN_ON_ONCE(!ret);
1233 break;
b4a75708 1234
c190d76e
MJ		 1235 case LTTNG_KERNEL_ABI_FUNCTION:
1236 lttng_fallthrough;
1237 case LTTNG_KERNEL_ABI_NOOP:
1238 lttng_fallthrough;
baf20995
MD		 1239 default:
1240 WARN_ON_ONCE(1);
4cf0bf51 1241 ret = -EINVAL;
df07930b 1242 goto register_error;
baf20995 1243 }
ee7e9a18 1244 ret = _lttng_event_recorder_metadata_statedump(event);
abc0446a
MD		 1245 WARN_ON_ONCE(ret > 0);
1246 if (ret) {
c099397a 1247 goto statedump_error;
abc0446a 1248 }
7cd0f696 1249 hlist_add_head(&event->priv->hlist_node, head);
19b98250 1250 list_add(&event->priv->node, event_list_head);
a67ba386 1251 return event_recorder;
4e3c1b9b 1252
c099397a 1253statedump_error:
259b6cb3 1254 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1255register_error:
756a020c
MD		 1256 lttng_kernel_event_free(event);
1257alloc_error:
4e3c1b9b 1258exist:
3c997079 1259type_error:
e5382b6d 1260full:
4cf0bf51 1261 return ERR_PTR(ret);
4e3c1b9b
MD		 1262}
1263
83006ee0
MD		 1264static
1265struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler,
1bbb5b2d 1266 const struct lttng_kernel_event_desc *event_desc)
dffef45d 1267{
0def9170 1268 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
19b98250 1269 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent);
1bbb5b2d 1270 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
1bbb5b2d 1271 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1272 struct lttng_kernel_event_common_private *event_priv;
756a020c 1273 struct lttng_kernel_event_common *event;
756a020c 1274 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1275 const char *event_name;
1276 struct hlist_head *head;
1277 int ret;
1278
1279 switch (itype) {
606828e4 1280 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1281 event_name = event_desc->event_name;
b01155ba 1282 break;
b4a75708 1283
c190d76e
MJ		 1284 case LTTNG_KERNEL_ABI_KPROBE:
1285 lttng_fallthrough;
1286 case LTTNG_KERNEL_ABI_UPROBE:
1287 lttng_fallthrough;
606828e4 1288 case LTTNG_KERNEL_ABI_SYSCALL:
1bbb5b2d 1289 event_name = event_param->name;
2b16f0c9 1290 break;
b4a75708 1291
c190d76e
MJ		 1292 case LTTNG_KERNEL_ABI_KRETPROBE:
1293 lttng_fallthrough;
1294 case LTTNG_KERNEL_ABI_FUNCTION:
1295 lttng_fallthrough;
1296 case LTTNG_KERNEL_ABI_NOOP:
1297 lttng_fallthrough;
dffef45d
FD		 1298 default:
1299 WARN_ON_ONCE(1);
1300 ret = -EINVAL;
1301 goto type_error;
1302 }
1303
0def9170 1304 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1305 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
0d223dc6 1306 if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) {
dffef45d
FD		 1307 ret = -EEXIST;
1308 goto exist;
1309 }
1310 }
1311
756a020c
MD		 1312 event = lttng_kernel_event_alloc(&event_enabler->parent);
1313 if (!event) {
a67ba386 1314 ret = -ENOMEM;
756a020c 1315 goto alloc_error;
a67ba386 1316 }
756a020c 1317 event_notifier = container_of(event, struct lttng_kernel_event_notifier, parent);
dffef45d
FD		 1318
1319 switch (itype) {
606828e4 1320 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1321 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1322 event->enabled = 0;
1323 event->priv->registered = 0;
1324 event->priv->desc = lttng_event_desc_get(event_name);
1325 if (!event->priv->desc) {
dffef45d
FD		 1326 ret = -ENOENT;
1327 goto register_error;
1328 }
1329 /* Populate lttng_event_notifier structure before event registration. */
1330 smp_wmb();
1331 break;
b4a75708 1332
606828e4 1333 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1334 /*
1335 * Needs to be explicitly enabled after creation, since
1336 * we may want to apply filters.
1337 */
7cd0f696
MD		 1338 event->enabled = 0;
1339 event->priv->registered = 1;
2b16f0c9
FD		 1340 /*
1341 * Populate lttng_event_notifier structure before event
1342 * registration.
1343 */
1344 smp_wmb();
1bbb5b2d
MD		 1345 ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name,
1346 event_param->u.kprobe.symbol_name,
1347 event_param->u.kprobe.offset,
1348 event_param->u.kprobe.addr,
7cd0f696 1349 event);
2b16f0c9
FD		 1350 if (ret) {
1351 ret = -EINVAL;
1352 goto register_error;
1353 }
7cd0f696 1354 ret = try_module_get(event->priv->desc->owner);
2b16f0c9
FD		 1355 WARN_ON_ONCE(!ret);
1356 break;
b4a75708 1357
606828e4 1358 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1359 /*
1360 * Needs to be explicitly enabled after creation, since
1361 * we may want to apply filters.
1362 */
7cd0f696
MD		 1363 event->enabled = 0;
1364 event->priv->registered = 0;
1365 event->priv->desc = event_desc;
1bbb5b2d 1366 switch (event_param->u.syscall.entryexit) {
606828e4 1367 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1368 ret = -EINVAL;
1369 goto register_error;
606828e4 1370 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1371 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1372 break;
606828e4 1373 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1374 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1375 break;
1376 }
1bbb5b2d 1377 switch (event_param->u.syscall.abi) {
606828e4 1378 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1379 ret = -EINVAL;
1380 goto register_error;
606828e4 1381 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1382 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1383 break;
606828e4 1384 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1385 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1386 break;
1387 }
1388
7cd0f696 1389 if (!event->priv->desc) {
8a8ac9a8
FD		 1390 ret = -EINVAL;
1391 goto register_error;
1392 }
1393 break;
b4a75708 1394
606828e4 1395 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1396 /*
1397 * Needs to be explicitly enabled after creation, since
1398 * we may want to apply filters.
1399 */
7cd0f696
MD		 1400 event->enabled = 0;
1401 event->priv->registered = 1;
9de67196
FD		 1402
1403 /*
1404 * Populate lttng_event_notifier structure before
1405 * event_notifier registration.
1406 */
1407 smp_wmb();
1408
1bbb5b2d
MD		 1409 ret = lttng_uprobes_register_event(event_param->name,
1410 event_param->u.uprobe.fd,
7cd0f696 1411 event);
9de67196
FD		 1412 if (ret)
1413 goto register_error;
7cd0f696 1414 ret = try_module_get(event->priv->desc->owner);
9de67196
FD		 1415 WARN_ON_ONCE(!ret);
1416 break;
b4a75708 1417
c190d76e
MJ		 1418 case LTTNG_KERNEL_ABI_KRETPROBE:
1419 lttng_fallthrough;
1420 case LTTNG_KERNEL_ABI_FUNCTION:
1421 lttng_fallthrough;
1422 case LTTNG_KERNEL_ABI_NOOP:
1423 lttng_fallthrough;
dffef45d
FD		 1424 default:
1425 WARN_ON_ONCE(1);
1426 ret = -EINVAL;
1427 goto register_error;
1428 }
1429
19b98250 1430 list_add(&event->priv->node, event_list_head);
7cd0f696 1431 hlist_add_head(&event->priv->hlist_node, head);
99f52fcc 1432
ccefc7ab
MD		 1433 ret = lttng_kernel_event_notifier_clear_error_counter(event);
1434 if (ret)
1435 goto register_error;
dffef45d
FD		 1436 return event_notifier;
1437
1438register_error:
756a020c
MD		 1439 lttng_kernel_event_free(event);
1440alloc_error:
dffef45d
FD		 1441exist:
1442type_error:
1443 return ERR_PTR(ret);
1444}
1445
83006ee0
MD		 1446struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1447 const struct lttng_kernel_event_desc *event_desc)
1448{
1449 switch (event_enabler->enabler_type) {
1450 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1451 {
1452 struct lttng_event_recorder_enabler *event_recorder_enabler =
1453 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1454 struct lttng_kernel_event_recorder *event_recorder;
1455
1456 event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc);
1457 if (!event_recorder)
1458 return NULL;
1459 return &event_recorder->parent;
1460 }
1461 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1462 {
1463 struct lttng_event_notifier_enabler *event_notifier_enabler =
1464 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1465 struct lttng_kernel_event_notifier *event_notifier;
1466
1467 event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc);
1468 if (!event_notifier)
1469 return NULL;
1470 return &event_notifier->parent;
1471 }
1472 default:
1473 return NULL;
1474 }
1475}
1476
1477struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1478 const struct lttng_kernel_event_desc *event_desc)
1479{
1480 struct lttng_kernel_event_common *event;
1481
1482 mutex_lock(&sessions_mutex);
1483 event = _lttng_kernel_event_create(event_enabler, event_desc);
1484 mutex_unlock(&sessions_mutex);
1485 return event;
1486}
1487
1488
1489
99f52fcc
FD		 1490int lttng_kernel_counter_read(struct lttng_counter *counter,
1491 const size_t *dim_indexes, int32_t cpu,
1492 int64_t *val, bool *overflow, bool *underflow)
1493{
1494 return counter->ops->counter_read(counter->counter, dim_indexes,
1495 cpu, val, overflow, underflow);
1496}
1497
1498int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1499 const size_t *dim_indexes, int64_t *val,
1500 bool *overflow, bool *underflow)
1501{
1502 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1503 val, overflow, underflow);
1504}
1505
1506int lttng_kernel_counter_clear(struct lttng_counter *counter,
1507 const size_t *dim_indexes)
1508{
1509 return counter->ops->counter_clear(counter->counter, dim_indexes);
1510}
1511
3c997079
MD		 1512/* Only used for tracepoints for now. */
1513static
0c851fa0 1514void register_event(struct lttng_kernel_event_common *event)
3c997079 1515{
437d5aa5 1516 const struct lttng_kernel_event_desc *desc;
f127e61e 1517 int ret = -EINVAL;
3c997079 1518
0c851fa0 1519 if (event->priv->registered)
3c997079 1520 return;
4ecb5ad5 1521
0c851fa0
MD		 1522 desc = event->priv->desc;
1523 switch (event->priv->instrumentation) {
606828e4 1524 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1525 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1526 desc->tp_class->probe_callback,
0c851fa0 1527 event);
4ecb5ad5 1528 break;
b4a75708 1529
606828e4 1530 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1531 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1532 break;
b4a75708 1533
c190d76e
MJ		 1534 case LTTNG_KERNEL_ABI_KPROBE:
1535 lttng_fallthrough;
1536 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1537 ret = 0;
f0bcc14c 1538 break;
0c851fa0
MD		 1539
1540 case LTTNG_KERNEL_ABI_KRETPROBE:
1541 switch (event->type) {
1542 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1543 ret = 0;
1544 break;
1545 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1546 WARN_ON_ONCE(1);
1547 break;
1548 }
4ecb5ad5 1549 break;
b4a75708 1550
c190d76e
MJ		 1551 case LTTNG_KERNEL_ABI_FUNCTION:
1552 lttng_fallthrough;
1553 case LTTNG_KERNEL_ABI_NOOP:
1554 lttng_fallthrough;
4ecb5ad5
MD		 1555 default:
1556 WARN_ON_ONCE(1);
1557 }
3c997079 1558 if (!ret)
0c851fa0 1559 event->priv->registered = 1;
3c997079
MD		 1560}
1561
f0bcc14c 1562int _lttng_event_unregister(struct lttng_kernel_event_common *event)
4e3c1b9b 1563{
f0bcc14c 1564 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1565 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1566 int ret = -EINVAL;
1567
a67ba386 1568 if (!event_priv->registered)
3c997079
MD		 1569 return 0;
1570
a67ba386
MD		 1571 desc = event_priv->desc;
1572 switch (event_priv->instrumentation) {
606828e4 1573 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1574 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1575 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1576 event);
baf20995 1577 break;
b4a75708 1578
606828e4 1579 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1580 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1581 ret = 0;
1582 break;
b4a75708 1583
606828e4 1584 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1585 switch (event->type) {
1586 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1587 lttng_kretprobes_unregister(event);
1588 ret = 0;
1589 break;
1590 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1591 WARN_ON_ONCE(1);
1592 break;
1593 }
7371f44c 1594 break;
b4a75708 1595
606828e4 1596 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1597 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1598 break;
b4a75708 1599
606828e4 1600 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1601 switch (event->type) {
1602 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1603 ret = 0;
1604 break;
1605 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1606 WARN_ON_ONCE(1);
1607 break;
1608 }
259b6cb3 1609 break;
b4a75708 1610
606828e4 1611 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1612 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1613 ret = 0;
1614 break;
b4a75708 1615
c190d76e
MJ		 1616 case LTTNG_KERNEL_ABI_FUNCTION:
1617 lttng_fallthrough;
baf20995
MD		 1618 default:
1619 WARN_ON_ONCE(1);
1620 }
3c997079 1621 if (!ret)
a67ba386 1622 event_priv->registered = 0;
dda6a249
MD		 1623 return ret;
1624}
1625
1626/*
1627 * Only used internally at session destruction.
1628 */
be066e6c 1629static
0648898e 1630void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1631{
0648898e 1632 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1633 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1634
0648898e
MD		 1635 lttng_free_event_filter_runtime(event);
1636 /* Free event enabler refs */
1637 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1638 &event_priv->enablers_ref_head, node)
1639 kfree(enabler_ref);
b4a75708 1640
0648898e
MD		 1641 switch (event->type) {
1642 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1643 {
1644 struct lttng_kernel_event_recorder *event_recorder =
1645 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1646
0648898e
MD		 1647 switch (event_priv->instrumentation) {
1648 case LTTNG_KERNEL_ABI_TRACEPOINT:
1649 lttng_event_desc_put(event_priv->desc);
1650 break;
b4a75708 1651
0648898e
MD		 1652 case LTTNG_KERNEL_ABI_KPROBE:
1653 module_put(event_priv->desc->owner);
6a35e5bd 1654 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1655 break;
b4a75708 1656
0648898e
MD		 1657 case LTTNG_KERNEL_ABI_KRETPROBE:
1658 module_put(event_priv->desc->owner);
eb6b47db 1659 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1660 break;
b4a75708 1661
0648898e
MD		 1662 case LTTNG_KERNEL_ABI_SYSCALL:
1663 break;
4e3c1b9b 1664
0648898e
MD		 1665 case LTTNG_KERNEL_ABI_UPROBE:
1666 module_put(event_priv->desc->owner);
17806c46 1667 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1668 break;
3ef5cc03 1669
c190d76e
MJ		 1670 case LTTNG_KERNEL_ABI_FUNCTION:
1671 lttng_fallthrough;
1672 case LTTNG_KERNEL_ABI_NOOP:
1673 lttng_fallthrough;
0648898e
MD		 1674 default:
1675 WARN_ON_ONCE(1);
1676 }
f237aef8 1677 list_del(&event_recorder->priv->parent.node);
0648898e
MD		 1678 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1679 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1680 break;
0648898e
MD		 1681 }
1682 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1683 {
1684 struct lttng_kernel_event_notifier *event_notifier =
1685 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1686
0648898e
MD		 1687 switch (event_notifier->priv->parent.instrumentation) {
1688 case LTTNG_KERNEL_ABI_TRACEPOINT:
1689 lttng_event_desc_put(event_notifier->priv->parent.desc);
1690 break;
b4a75708 1691
0648898e
MD		 1692 case LTTNG_KERNEL_ABI_KPROBE:
1693 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1694 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1695 break;
b4a75708 1696
0648898e
MD		 1697 case LTTNG_KERNEL_ABI_SYSCALL:
1698 break;
b4a75708 1699
0648898e
MD		 1700 case LTTNG_KERNEL_ABI_UPROBE:
1701 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1702 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1703 break;
1704
c190d76e
MJ		 1705 case LTTNG_KERNEL_ABI_KRETPROBE:
1706 lttng_fallthrough;
1707 case LTTNG_KERNEL_ABI_FUNCTION:
1708 lttng_fallthrough;
1709 case LTTNG_KERNEL_ABI_NOOP:
1710 lttng_fallthrough;
0648898e
MD		 1711 default:
1712 WARN_ON_ONCE(1);
1713 }
f237aef8 1714 list_del(&event_notifier->priv->parent.node);
0648898e
MD		 1715 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1716 kmem_cache_free(event_notifier_cache, event_notifier);
1717 break;
1718 }
dffef45d
FD		 1719 default:
1720 WARN_ON_ONCE(1);
1721 }
dffef45d
FD		 1722}
1723
8c0393c3 1724struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1725 enum tracker_type tracker_type)
e0130fab 1726{
d1f652f8
MD		 1727 switch (tracker_type) {
1728 case TRACKER_PID:
1729 return &session->pid_tracker;
1730 case TRACKER_VPID:
1731 return &session->vpid_tracker;
1732 case TRACKER_UID:
1733 return &session->uid_tracker;
1734 case TRACKER_VUID:
1735 return &session->vuid_tracker;
1736 case TRACKER_GID:
1737 return &session->gid_tracker;
1738 case TRACKER_VGID:
1739 return &session->vgid_tracker;
1740 default:
1741 WARN_ON_ONCE(1);
1742 return NULL;
1743 }
1744}
1745
8cdc1a81 1746int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1747 enum tracker_type tracker_type, int id)
1748{
8c0393c3 1749 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1750 int ret;
1751
d1f652f8
MD		 1752 tracker = get_tracker(session, tracker_type);
1753 if (!tracker)
1754 return -EINVAL;
1755 if (id < -1)
e0130fab
MD		 1756 return -EINVAL;
1757 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1758 if (id == -1) {
1759 /* track all ids: destroy tracker. */
1760 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1761 ret = 0;
1762 } else {
d1f652f8 1763 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1764 }
e0130fab
MD		 1765 mutex_unlock(&sessions_mutex);
1766 return ret;
1767}
1768
8cdc1a81 1769int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1770 enum tracker_type tracker_type, int id)
e0130fab 1771{
8c0393c3 1772 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1773 int ret;
1774
d1f652f8
MD		 1775 tracker = get_tracker(session, tracker_type);
1776 if (!tracker)
1777 return -EINVAL;
1778 if (id < -1)
e0130fab
MD		 1779 return -EINVAL;
1780 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1781 if (id == -1) {
1782 /* untrack all ids: replace by empty tracker. */
1783 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1784 } else {
d1f652f8 1785 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1786 }
e0130fab
MD		 1787 mutex_unlock(&sessions_mutex);
1788 return ret;
1789}
1790
7e6f9ef6 1791static
d1f652f8 1792void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1793{
8c0393c3
MD		 1794 struct lttng_kernel_id_tracker *id_tracker = m->private;
1795 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1796 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1797 int iter = 0, i;
1798
1799 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1800 if (id_tracker_p) {
1801 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1802 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1803
f934e302 1804 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1805 if (iter++ >= *pos)
1806 return e;
1807 }
1808 }
1809 } else {
d1f652f8 1810 /* ID tracker disabled. */
7e6f9ef6 1811 if (iter >= *pos && iter == 0) {
d1f652f8 1812 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1813 }
1814 iter++;
1815 }
1816 /* End of list */
1817 return NULL;
1818}
1819
1820/* Called with sessions_mutex held. */
1821static
d1f652f8 1822void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1823{
8c0393c3
MD		 1824 struct lttng_kernel_id_tracker *id_tracker = m->private;
1825 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1826 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1827 int iter = 0, i;
1828
1829 (*ppos)++;
d1f652f8
MD		 1830 if (id_tracker_p) {
1831 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1832 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1833
f934e302 1834 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1835 if (iter++ >= *ppos)
1836 return e;
1837 }
1838 }
1839 } else {
d1f652f8 1840 /* ID tracker disabled. */
7e6f9ef6 1841 if (iter >= *ppos && iter == 0)
d1f652f8 1842 return p; /* empty tracker */
7e6f9ef6
MD		 1843 iter++;
1844 }
1845
1846 /* End of list */
1847 return NULL;
1848}
1849
1850static
d1f652f8 1851void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1852{
1853 mutex_unlock(&sessions_mutex);
1854}
1855
1856static
d1f652f8 1857int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1858{
8c0393c3
MD		 1859 struct lttng_kernel_id_tracker *id_tracker = m->private;
1860 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1861 int id;
7e6f9ef6 1862
d1f652f8 1863 if (p == id_tracker_p) {
7e6f9ef6 1864 /* Tracker disabled. */
d1f652f8 1865 id = -1;
7e6f9ef6 1866 } else {
d1f652f8 1867 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1868
d1f652f8
MD		 1869 id = lttng_id_tracker_get_node_id(e);
1870 }
8c0393c3 1871 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1872 case TRACKER_PID:
1873 seq_printf(m, "process { pid = %d; };\n", id);
1874 break;
1875 case TRACKER_VPID:
1876 seq_printf(m, "process { vpid = %d; };\n", id);
1877 break;
1878 case TRACKER_UID:
1879 seq_printf(m, "user { uid = %d; };\n", id);
1880 break;
1881 case TRACKER_VUID:
1882 seq_printf(m, "user { vuid = %d; };\n", id);
1883 break;
1884 case TRACKER_GID:
1885 seq_printf(m, "group { gid = %d; };\n", id);
1886 break;
1887 case TRACKER_VGID:
1888 seq_printf(m, "group { vgid = %d; };\n", id);
1889 break;
1890 default:
1891 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1892 }
7e6f9ef6
MD		 1893 return 0;
1894}
1895
1896static
d1f652f8
MD		 1897const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1898 .start = id_list_start,
1899 .next = id_list_next,
1900 .stop = id_list_stop,
1901 .show = id_list_show,
7e6f9ef6
MD		 1902};
1903
1904static
d1f652f8 1905int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1906{
d1f652f8 1907 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1908}
1909
1910static
d1f652f8 1911int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1912{
1913 struct seq_file *m = file->private_data;
8c0393c3 1914 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1915 int ret;
1916
d1f652f8 1917 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1918 ret = seq_release(inode, file);
d1f652f8 1919 if (!ret)
8c0393c3 1920 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1921 return ret;
1922}
1923
d1f652f8 1924const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1925 .owner = THIS_MODULE,
d1f652f8 1926 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1927 .read = seq_read,
1928 .llseek = seq_lseek,
d1f652f8 1929 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1930};
1931
8cdc1a81 1932int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1933 enum tracker_type tracker_type)
7e6f9ef6 1934{
d1f652f8 1935 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1936 struct seq_file *m;
1937 int file_fd, ret;
1938
1939 file_fd = lttng_get_unused_fd();
1940 if (file_fd < 0) {
1941 ret = file_fd;
1942 goto fd_error;
1943 }
1944
d1f652f8
MD		 1945 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1946 &lttng_tracker_ids_list_fops,
7e6f9ef6 1947 NULL, O_RDWR);
d1f652f8
MD		 1948 if (IS_ERR(tracker_ids_list_file)) {
1949 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1950 goto file_error;
1951 }
8cdc1a81 1952 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1953 ret = -EOVERFLOW;
9c1f4643
MD		 1954 goto refcount_error;
1955 }
d1f652f8 1956 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1957 if (ret < 0)
1958 goto open_error;
d1f652f8
MD		 1959 m = tracker_ids_list_file->private_data;
1960
1961 m->private = get_tracker(session, tracker_type);
1962 BUG_ON(!m->private);
1963 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1964
1965 return file_fd;
1966
1967open_error:
8cdc1a81 1968 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1969refcount_error:
d1f652f8 1970 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1971file_error:
1972 put_unused_fd(file_fd);
1973fd_error:
1974 return ret;
1975}
1976
3c997079
MD		 1977/*
1978 * Enabler management.
1979 */
1980static
4993071a
PP		 1981int lttng_match_enabler_star_glob(const char *desc_name,
1982 const char *pattern)
3c997079 1983{
cbc19040
MD		 1984 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1985 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1986 return 0;
1987 return 1;
1988}
1989
1990static
4ecb5ad5
MD		 1991int lttng_match_enabler_name(const char *desc_name,
1992 const char *name)
3c997079 1993{
4ecb5ad5 1994 if (strcmp(desc_name, name))
3c997079
MD		 1995 return 0;
1996 return 1;
1997}
1998
8bff0fc3
MD		 1999static
2000int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
8d554755 2001 struct lttng_event_enabler_common *enabler)
3c997079 2002{
4ecb5ad5 2003 const char *desc_name, *enabler_name;
badfe9f5 2004 bool compat = false, entry = false;
4ecb5ad5
MD		 2005
2006 enabler_name = enabler->event_param.name;
2007 switch (enabler->event_param.instrumentation) {
606828e4 2008 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 2009 desc_name = desc->event_name;
3b861b22
FD		 2010 switch (enabler->format_type) {
2011 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2012 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2013 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2014 return lttng_match_enabler_name(desc_name, enabler_name);
2015 default:
2016 return -EINVAL;
2017 }
4ecb5ad5 2018 break;
b4a75708 2019
606828e4 2020 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 2021 desc_name = desc->event_name;
badfe9f5 2022 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 2023 desc_name += strlen("compat_");
badfe9f5
MD		 2024 compat = true;
2025 }
4ecb5ad5
MD		 2026 if (!strncmp(desc_name, "syscall_exit_",
2027 strlen("syscall_exit_"))) {
2028 desc_name += strlen("syscall_exit_");
2029 } else if (!strncmp(desc_name, "syscall_entry_",
2030 strlen("syscall_entry_"))) {
2031 desc_name += strlen("syscall_entry_");
badfe9f5 2032 entry = true;
4ecb5ad5
MD		 2033 } else {
2034 WARN_ON_ONCE(1);
2035 return -EINVAL;
2036 }
badfe9f5 2037 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 2038 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 2039 break;
606828e4 2040 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 2041 if (!entry)
2042 return 0;
2043 break;
606828e4 2044 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 2045 if (entry)
2046 return 0;
2047 break;
2048 default:
2049 return -EINVAL;
2050 }
2051 switch (enabler->event_param.u.syscall.abi) {
606828e4 2052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2053 break;
606828e4 2054 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2055 if (compat)
2056 return 0;
2057 break;
606828e4 2058 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2059 if (!compat)
2060 return 0;
2061 break;
2062 default:
2063 return -EINVAL;
2064 }
2065 switch (enabler->event_param.u.syscall.match) {
606828e4 2066 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2067 switch (enabler->format_type) {
2068 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2069 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2070 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2071 return lttng_match_enabler_name(desc_name, enabler_name);
2072 default:
2073 return -EINVAL;
2074 }
2075 break;
606828e4 2076 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2077 return -EINVAL; /* Not implemented. */
2078 default:
2079 return -EINVAL;
2080 }
4ecb5ad5 2081 break;
b4a75708 2082
4ecb5ad5
MD		 2083 default:
2084 WARN_ON_ONCE(1);
2085 return -EINVAL;
2086 }
3c997079
MD		 2087}
2088
8bff0fc3
MD		 2089bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
2090 struct lttng_event_enabler_common *enabler)
2091{
2092 int ret;
2093
2094 ret = lttng_desc_match_enabler_check(desc, enabler);
2095 if (ret < 0) {
2096 WARN_ON_ONCE(1);
2097 return false;
2098 }
2099 return ret;
2100}
2101
5c6ec66a
MD		 2102bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
2103 struct lttng_kernel_event_common *event)
3c997079 2104{
5c6ec66a
MD		 2105 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2106 return false;
b2bc0bc8 2107
5c6ec66a
MD		 2108 switch (event_enabler->enabler_type) {
2109 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2110 {
2111 struct lttng_event_recorder_enabler *event_recorder_enabler =
2112 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2113 struct lttng_kernel_event_recorder *event_recorder =
2114 container_of(event, struct lttng_kernel_event_recorder, parent);
2115
2116 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2117 && event_recorder->chan == event_recorder_enabler->chan)
2118 return true;
2119 else
2120 return false;
2121 }
2122 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2123 {
2124 struct lttng_event_notifier_enabler *event_notifier_enabler =
2125 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2126 struct lttng_kernel_event_notifier *event_notifier =
2127 container_of(event, struct lttng_kernel_event_notifier, parent);
2128
2129 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2130 && event_notifier->priv->group == event_notifier_enabler->group
2131 && event->priv->user_token == event_enabler->user_token)
2132 return true;
2133 else
2134 return false;
2135 }
2136 default:
2137 WARN_ON_ONCE(1);
2138 return false;
2139 }
3c997079
MD		 2140}
2141
5c6ec66a
MD		 2142bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
2143 const struct lttng_kernel_event_desc *desc,
2144 struct lttng_kernel_event_common *event)
b01155ba 2145{
5c6ec66a
MD		 2146 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2147 return false;
b01155ba 2148
5c6ec66a
MD		 2149 switch (event_enabler->enabler_type) {
2150 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2151 {
2152 struct lttng_event_recorder_enabler *event_recorder_enabler =
2153 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2154 struct lttng_kernel_event_recorder *event_recorder =
2155 container_of(event, struct lttng_kernel_event_recorder, parent);
2156
2157 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
2158 return true;
2159 else
2160 return false;
2161 }
2162 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2163 {
2164 struct lttng_event_notifier_enabler *event_notifier_enabler =
2165 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2166 struct lttng_kernel_event_notifier *event_notifier =
2167 container_of(event, struct lttng_kernel_event_notifier, parent);
2168
2169 if (event->priv->desc == desc
2170 && event_notifier->priv->group == event_notifier_enabler->group
2171 && event->priv->user_token == event_enabler->user_token)
2172 return true;
2173 else
2174 return false;
2175 }
2176 default:
2177 WARN_ON_ONCE(1);
2178 return false;
2179 }
b01155ba
FD		 2180}
2181
0d223dc6
MD		 2182bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler,
2183 const char *event_name,
2184 struct lttng_kernel_event_common *event)
2185{
2186 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2187 return false;
2188
2189 switch (event_enabler->enabler_type) {
2190 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2191 {
2192 struct lttng_event_recorder_enabler *event_recorder_enabler =
2193 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2194 struct lttng_kernel_event_recorder *event_recorder =
2195 container_of(event, struct lttng_kernel_event_recorder, parent);
2196
2197 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2198 && event_recorder->chan == event_recorder_enabler->chan)
2199 return true;
2200 else
2201 return false;
2202 }
2203 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2204 {
2205 struct lttng_event_notifier_enabler *event_notifier_enabler =
2206 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2207 struct lttng_kernel_event_notifier *event_notifier =
2208 container_of(event, struct lttng_kernel_event_notifier, parent);
2209
2210 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2211 && event_notifier->priv->group == event_notifier_enabler->group
2212 && event->priv->user_token == event_enabler->user_token)
2213 return true;
2214 else
2215 return false;
2216 }
2217 default:
2218 WARN_ON_ONCE(1);
2219 return false;
2220 }
2221}
2222
3c997079 2223static
b2bc0bc8
FD		 2224struct lttng_enabler_ref *lttng_enabler_ref(
2225 struct list_head *enablers_ref_list,
8d554755 2226 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2227{
2228 struct lttng_enabler_ref *enabler_ref;
2229
b2bc0bc8 2230 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2231 if (enabler_ref->ref == enabler)
2232 return enabler_ref;
2233 }
2234 return NULL;
2235}
2236
3c997079 2237static
c8e14380 2238void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common *event_enabler)
3c997079 2239{
c8e14380 2240 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
437d5aa5
MD		 2241 struct lttng_kernel_probe_desc *probe_desc;
2242 const struct lttng_kernel_event_desc *desc;
3c997079 2243 struct list_head *probe_list;
c8e14380 2244 int i;
3c997079
MD		 2245
2246 probe_list = lttng_get_probe_list_head();
2247 /*
2248 * For each probe event, if we find that a probe event matches
2249 * our enabler, create an associated lttng_event if not
2250 * already present.
2251 */
2252 list_for_each_entry(probe_desc, probe_list, head) {
2253 for (i = 0; i < probe_desc->nr_events; i++) {
2254 int found = 0;
2255 struct hlist_head *head;
83006ee0 2256 struct lttng_kernel_event_common *event;
19bef247 2257 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2258
2259 desc = probe_desc->event_desc[i];
c8e14380 2260 if (!lttng_desc_match_enabler(desc, event_enabler))
3c997079 2261 continue;
3c997079
MD		 2262
2263 /*
2264 * Check if already created.
2265 */
0def9170 2266 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2267 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
c8e14380 2268 if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub))
3c997079
MD		 2269 found = 1;
2270 }
2271 if (found)
2272 continue;
2273
2274 /*
83006ee0 2275 * We need to create an event for this event probe.
3c997079 2276 */
c8e14380 2277 event = _lttng_kernel_event_create(event_enabler, desc);
83006ee0 2278 if (!event) {
5a15f70c 2279 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2280 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2281 }
2282 }
2283 }
2284}
2285
33a39a3c 2286static
053554ae 2287void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c
MD		 2288{
2289 int ret;
2290
053554ae 2291 ret = lttng_syscalls_register_event(event_enabler);
8a8ac9a8 2292 WARN_ON_ONCE(ret);
8a8ac9a8
FD		 2293}
2294
33a39a3c 2295/*
8839618b 2296 * Create event if it is missing and present in the list of tracepoint probes.
33a39a3c
MD		 2297 * Should be called with sessions mutex held.
2298 */
2299static
8839618b 2300void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c 2301{
8839618b 2302 switch (event_enabler->event_param.instrumentation) {
606828e4 2303 case LTTNG_KERNEL_ABI_TRACEPOINT:
8839618b 2304 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2305 break;
b4a75708 2306
606828e4 2307 case LTTNG_KERNEL_ABI_SYSCALL:
8839618b 2308 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2309 break;
b4a75708 2310
33a39a3c
MD		 2311 default:
2312 WARN_ON_ONCE(1);
2313 break;
2314 }
2315}
2316
d619fae9
MD		 2317static
2318void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
2319 struct lttng_kernel_event_common *event)
2320{
2321 /* Link filter bytecodes if not linked yet. */
2322 lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx,
2323 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
2324}
2325
1e06b222
MD		 2326static
2327void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
2328 struct lttng_kernel_event_common *event)
2329{
2330 switch (event_enabler->enabler_type) {
2331 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2332 break;
2333 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2334 {
2335 struct lttng_event_notifier_enabler *event_notifier_enabler =
2336 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2337 struct lttng_kernel_event_notifier *event_notifier =
2338 container_of(event, struct lttng_kernel_event_notifier, parent);
2339
2340 /* Link capture bytecodes if not linked yet. */
2341 lttng_enabler_link_bytecode(event->priv->desc,
2342 lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head,
2343 &event_notifier_enabler->capture_bytecode_head);
2344 event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
2345 break;
2346 }
2347 default:
2348 WARN_ON_ONCE(1);
2349 }
2350}
2351
3c997079 2352/*
b2bc0bc8 2353 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2354 * and add backward reference from the event to the enabler.
2355 * Should be called with sessions mutex held.
2356 */
2357static
3622cd47 2358int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler)
3c997079 2359{
3622cd47
MD		 2360 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
2361 struct lttng_kernel_event_common_private *event_priv;
3c997079 2362
3622cd47 2363 lttng_syscall_table_set_wildcard_all(event_enabler);
badfe9f5 2364
3c997079 2365 /* First ensure that probe events are created for this enabler. */
3622cd47 2366 lttng_create_event_if_missing(event_enabler);
3c997079 2367
3622cd47
MD		 2368 /* Link the created event with its associated enabler. */
2369 list_for_each_entry(event_priv, event_list_head, node) {
2370 struct lttng_kernel_event_common *event = event_priv->pub;
b01155ba
FD		 2371 struct lttng_enabler_ref *enabler_ref;
2372
3622cd47 2373 if (!lttng_event_enabler_match_event(event_enabler, event))
b01155ba
FD		 2374 continue;
2375
3622cd47 2376 enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler);
b01155ba
FD		 2377 if (!enabler_ref) {
2378 /*
2379 * If no backward ref, create it.
2380 * Add backward ref from event_notifier to enabler.
2381 */
2382 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2383 if (!enabler_ref)
2384 return -ENOMEM;
2385
3622cd47
MD		 2386 enabler_ref->ref = event_enabler;
2387 list_add(&enabler_ref->node, &event_priv->enablers_ref_head);
b01155ba
FD		 2388 }
2389
3622cd47
MD		 2390 lttng_event_enabler_init_event_filter(event_enabler, event);
2391 lttng_event_enabler_init_event_capture(event_enabler, event);
b01155ba
FD		 2392 }
2393 return 0;
2394}
2395
3c997079
MD		 2396/*
2397 * Called at module load: connect the probe on all enablers matching
2398 * this event.
2399 * Called with sessions lock held.
2400 */
2401int lttng_fix_pending_events(void)
2402{
8cdc1a81 2403 struct lttng_kernel_session_private *session_priv;
3c997079 2404
8cdc1a81
MD		 2405 list_for_each_entry(session_priv, &sessions, list)
2406 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2407 return 0;
2408}
2409
b01155ba
FD		 2410static bool lttng_event_notifier_group_has_active_event_notifiers(
2411 struct lttng_event_notifier_group *event_notifier_group)
2412{
09710b83 2413 struct lttng_event_enabler_common *event_enabler;
b01155ba 2414
09710b83
MD		 2415 list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) {
2416 if (event_enabler->enabled)
b01155ba
FD		 2417 return true;
2418 }
2419 return false;
2420}
2421
2422bool lttng_event_notifier_active(void)
2423{
2424 struct lttng_event_notifier_group *event_notifier_group;
2425
2426 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2427 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2428 return true;
2429 }
2430 return false;
2431}
2432
2433int lttng_fix_pending_event_notifiers(void)
2434{
2435 struct lttng_event_notifier_group *event_notifier_group;
2436
2437 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2438 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2439 return 0;
2440}
2441
1ae083ba 2442struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2443 enum lttng_enabler_format_type format_type,
606828e4 2444 struct lttng_kernel_abi_event *event_param,
f7d06400 2445 struct lttng_kernel_channel_buffer *chan)
3c997079 2446{
1ae083ba 2447 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2448
b2bc0bc8
FD		 2449 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2450 if (!event_enabler)
3c997079 2451 return NULL;
0bb716a8 2452 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2453 event_enabler->parent.format_type = format_type;
2454 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2455 memcpy(&event_enabler->parent.event_param, event_param,
2456 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2457 event_enabler->chan = chan;
3c997079 2458 /* ctx left NULL */
5b9817ae 2459 event_enabler->parent.enabled = 0;
def1e304
MD		 2460 return event_enabler;
2461}
2462
2463void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2464 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2465{
3c997079 2466 mutex_lock(&sessions_mutex);
09710b83
MD		 2467 list_add(&event_enabler->parent.node, &session->priv->enablers_head);
2468 event_enabler->parent.published = true;
def1e304 2469 lttng_session_lazy_sync_event_enablers(session);
3c997079 2470 mutex_unlock(&sessions_mutex);
3c997079
MD		 2471}
2472
7b25ab0e 2473int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2474{
2475 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2476 event_enabler->enabled = 1;
2477 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2478 mutex_unlock(&sessions_mutex);
2479 return 0;
2480}
2481
7b25ab0e 2482int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2483{
2484 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2485 event_enabler->enabled = 0;
2486 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2487 mutex_unlock(&sessions_mutex);
2488 return 0;
2489}
2490
b2bc0bc8 2491static
8d554755 2492int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2493 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2494{
d64ca521 2495 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2496 uint32_t bytecode_len;
2497 int ret;
2498
2499 ret = get_user(bytecode_len, &bytecode->len);
2500 if (ret)
2501 return ret;
52cfcdf3 2502 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2503 GFP_KERNEL);
2504 if (!bytecode_node)
2505 return -ENOMEM;
2506 ret = copy_from_user(&bytecode_node->bc, bytecode,
2507 sizeof(*bytecode) + bytecode_len);
2508 if (ret)
2509 goto error_free;
b2bc0bc8 2510
8a445457 2511 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2512 bytecode_node->enabler = enabler;
2513 /* Enforce length based on allocated size */
2514 bytecode_node->bc.len = bytecode_len;
2515 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2516
07dfc1d0
MD		 2517 return 0;
2518
2519error_free:
52cfcdf3 2520 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2521 return ret;
2522}
2523
6048044f 2524int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2525 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2526{
2527 int ret;
6048044f 2528 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2529 if (ret)
2530 goto error;
7b25ab0e 2531 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2532 return 0;
2533
2534error:
2535 return ret;
2536}
2537
e2d5dbc7 2538int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2539 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2540{
2541
e2d5dbc7 2542 switch (event->priv->instrumentation) {
606828e4 2543 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2544 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2545 default:
2546 return -EINVAL;
2547 }
2548}
2549
3c997079 2550static
8d554755 2551void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2552{
d64ca521 2553 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2554
2555 /* Destroy filter bytecode */
2556 list_for_each_entry_safe(filter_node, tmp_filter_node,
2557 &enabler->filter_bytecode_head, node) {
52cfcdf3 2558 lttng_kvfree(filter_node);
07dfc1d0 2559 }
b2bc0bc8
FD		 2560}
2561
44b1abdc 2562void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2563{
09710b83
MD		 2564 lttng_enabler_destroy(event_enabler);
2565 if (event_enabler->published)
2566 list_del(&event_enabler->node);
2567
44b1abdc
MD		 2568 switch (event_enabler->enabler_type) {
2569 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2570 {
2571 struct lttng_event_recorder_enabler *event_recorder_enabler =
2572 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2573
44b1abdc
MD		 2574 kfree(event_recorder_enabler);
2575 break;
2576 }
2577 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2578 {
2579 struct lttng_event_notifier_enabler *event_notifier_enabler =
2580 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2581
44b1abdc
MD		 2582 kfree(event_notifier_enabler);
2583 break;
2584 }
2585 default:
2586 WARN_ON_ONCE(1);
2587 }
3c997079
MD		 2588}
2589
dffef45d 2590struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2591 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2592 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2593 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2594{
2595 struct lttng_event_notifier_enabler *event_notifier_enabler;
2596
2597 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2598 if (!event_notifier_enabler)
2599 return NULL;
2600
0bb716a8 2601 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2602 event_notifier_enabler->parent.format_type = format_type;
2603 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2604 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2605
99f52fcc 2606 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2607 event_notifier_enabler->num_captures = 0;
dffef45d 2608
5b9817ae
MD		 2609 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2610 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2611
5b9817ae
MD		 2612 event_notifier_enabler->parent.enabled = 0;
2613 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2614 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2615 return event_notifier_enabler;
2616}
dffef45d 2617
1bbb5b2d
MD		 2618void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2619 struct lttng_event_notifier_enabler *event_notifier_enabler)
2620{
dffef45d 2621 mutex_lock(&sessions_mutex);
09710b83
MD		 2622 list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head);
2623 event_notifier_enabler->parent.published = true;
b01155ba 2624 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2625 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2626}
2627
2628int lttng_event_notifier_enabler_enable(
2629 struct lttng_event_notifier_enabler *event_notifier_enabler)
2630{
2631 mutex_lock(&sessions_mutex);
2632 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2633 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2634 mutex_unlock(&sessions_mutex);
2635 return 0;
2636}
2637
2638int lttng_event_notifier_enabler_disable(
2639 struct lttng_event_notifier_enabler *event_notifier_enabler)
2640{
2641 mutex_lock(&sessions_mutex);
2642 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2643 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2644 mutex_unlock(&sessions_mutex);
2645 return 0;
2646}
2647
99d223ad
FD		 2648int lttng_event_notifier_enabler_attach_capture_bytecode(
2649 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2650 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2651{
d64ca521 2652 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2653 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2654 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2655 uint32_t bytecode_len;
2656 int ret;
2657
2658 ret = get_user(bytecode_len, &bytecode->len);
2659 if (ret)
2660 return ret;
2661
2662 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2663 GFP_KERNEL);
2664 if (!bytecode_node)
2665 return -ENOMEM;
2666
2667 ret = copy_from_user(&bytecode_node->bc, bytecode,
2668 sizeof(*bytecode) + bytecode_len);
2669 if (ret)
2670 goto error_free;
2671
8a445457 2672 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2673 bytecode_node->enabler = enabler;
2674
2675 /* Enforce length based on allocated size */
2676 bytecode_node->bc.len = bytecode_len;
2677 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2678
2679 event_notifier_enabler->num_captures++;
2680
2681 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2682 goto end;
2683
2684error_free:
2685 lttng_kvfree(bytecode_node);
2686end:
2687 return ret;
2688}
2689
cc5719b1
MD		 2690static
2691void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event)
2692{
2693 int has_enablers_without_filter_bytecode = 0, nr_filters = 0;
2694 struct lttng_kernel_bytecode_runtime *runtime;
2695 struct lttng_enabler_ref *enabler_ref;
2696
2697 /* Check if has enablers without bytecode enabled */
2698 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2699 if (enabler_ref->ref->enabled
2700 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2701 has_enablers_without_filter_bytecode = 1;
2702 break;
2703 }
2704 }
2705 event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode;
2706
2707 /* Enable filters */
2708 list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) {
2709 lttng_bytecode_sync_state(runtime);
2710 nr_filters++;
2711 }
2712 WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters));
2713}
2714
2715static
2716void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event)
2717{
2718 switch (event->type) {
2719 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2720 break;
2721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2722 {
2723 struct lttng_kernel_event_notifier *event_notifier =
2724 container_of(event, struct lttng_kernel_event_notifier, parent);
2725 struct lttng_kernel_bytecode_runtime *runtime;
2726 int nr_captures = 0;
2727
2728 /* Enable captures */
2729 list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) {
2730 lttng_bytecode_sync_state(runtime);
2731 nr_captures++;
2732 }
2733 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2734 break;
2735 }
2736 default:
2737 WARN_ON_ONCE(1);
2738 }
2739}
2740
a0c6ad2e
MD		 2741static
2742bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event)
2743{
2744 struct lttng_enabler_ref *enabler_ref;
2745 bool enabled = false;
2746
2747 switch (event->priv->instrumentation) {
2748 case LTTNG_KERNEL_ABI_TRACEPOINT:
2749 lttng_fallthrough;
2750 case LTTNG_KERNEL_ABI_SYSCALL:
2751 /* Enable events */
2752 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2753 if (enabler_ref->ref->enabled) {
2754 enabled = true;
2755 break;
2756 }
2757 }
2758 break;
2759 default:
2760 WARN_ON_ONCE(1);
2761 return false;
2762 }
2763
2764 switch (event->type) {
2765 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2766 {
2767 struct lttng_kernel_event_recorder *event_recorder =
2768 container_of(event, struct lttng_kernel_event_recorder, parent);
2769
2770 /*
2771 * Enabled state is based on union of enablers, with
2772 * intersection of session and channel transient enable
2773 * states.
2774 */
2775 return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2776 }
2777 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2778 return enabled;
2779 default:
2780 WARN_ON_ONCE(1);
2781 return false;
2782 }
2783}
2784
2785static
2786bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event)
2787{
2788 switch (event->priv->instrumentation) {
2789 case LTTNG_KERNEL_ABI_TRACEPOINT:
2790 lttng_fallthrough;
2791 case LTTNG_KERNEL_ABI_SYSCALL:
2792 return true;
2793
2794 default:
2795 /* Not handled with lazy sync. */
2796 return false;
2797 }
2798}
2799
3c997079 2800/*
3c997079
MD		 2801 * Should be called with sessions mutex held.
2802 */
2803static
a0c6ad2e
MD		 2804void lttng_sync_event_list(struct list_head *event_enabler_list,
2805 struct list_head *event_list)
3c997079 2806{
a0c6ad2e 2807 struct lttng_kernel_event_common_private *event_priv;
09710b83 2808 struct lttng_event_enabler_common *event_enabler;
3c997079 2809
a0c6ad2e 2810 list_for_each_entry(event_enabler, event_enabler_list, node)
09710b83 2811 lttng_event_enabler_ref_events(event_enabler);
a0c6ad2e 2812
3c997079
MD		 2813 /*
2814 * For each event, if at least one of its enablers is enabled,
2815 * and its channel and session transient states are enabled, we
2816 * enable the event, else we disable it.
2817 */
a0c6ad2e
MD		 2818 list_for_each_entry(event_priv, event_list, node) {
2819 struct lttng_kernel_event_common *event = event_priv->pub;
2820 bool enabled;
b4a75708 2821
a0c6ad2e 2822 if (!lttng_event_is_lazy_sync(event))
3c997079 2823 continue;
3c997079 2824
a0c6ad2e
MD		 2825 enabled = lttng_get_event_enabled_state(event);
2826 WRITE_ONCE(event->enabled, enabled);
3c997079 2827 /*
a0c6ad2e 2828 * Sync tracepoint registration with event enabled state.
3c997079
MD		 2829 */
2830 if (enabled) {
a0c6ad2e 2831 register_event(event);
3c997079 2832 } else {
a0c6ad2e 2833 _lttng_event_unregister(event);
3c997079 2834 }
07dfc1d0 2835
a0c6ad2e
MD		 2836 lttng_event_sync_filter_state(event);
2837 lttng_event_sync_capture_state(event);
3c997079
MD		 2838 }
2839}
2840
a0c6ad2e
MD		 2841/*
2842 * lttng_session_sync_event_enablers should be called just before starting a
2843 * session.
2844 */
2845static
2846void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2847{
2848 lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events);
2849}
2850
3c997079
MD		 2851/*
2852 * Apply enablers to session events, adding events to session if need
2853 * be. It is required after each modification applied to an active
2854 * session, and right before session "start".
2855 * "lazy" sync means we only sync if required.
2856 * Should be called with sessions mutex held.
2857 */
2858static
8cdc1a81 2859void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2860{
2861 /* We can skip if session is not active */
2862 if (!session->active)
2863 return;
b2bc0bc8 2864 lttng_session_sync_event_enablers(session);
3c997079
MD		 2865}
2866
b01155ba
FD		 2867static
2868void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2869{
a0c6ad2e 2870 lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head);
b01155ba
FD		 2871}
2872
7b25ab0e
MD		 2873static
2874void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2875{
2876 switch (event_enabler->enabler_type) {
2877 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2878 {
2879 struct lttng_event_recorder_enabler *event_recorder_enabler =
2880 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2881 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2882 break;
2883 }
2884 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2885 {
2886 struct lttng_event_notifier_enabler *event_notifier_enabler =
2887 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2888 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2889 break;
2890 }
2891 default:
2892 WARN_ON_ONCE(1);
2893 }
2894}
2895
1ec3f75a 2896/*
d83004aa
JD		 2897 * Serialize at most one packet worth of metadata into a metadata
2898 * channel.
92d9f5e6
MD		 2899 * We grab the metadata cache mutex to get exclusive access to our metadata
2900 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2901 * allows us to do racy operations such as looking for remaining space left in
2902 * packet and write, since mutual exclusion protects us from concurrent writes.
2903 * Mutual exclusion on the metadata cache allow us to read the cache content
2904 * without racing against reallocation of the cache by updates.
35097f36
JD		 2905 * Returns the number of bytes written in the channel, 0 if no data
2906 * was written and a negative value on error.
1ec3f75a 2907 */
b3b8072b 2908int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2909 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2910{
8a57ec02 2911 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2912 int ret = 0;
2913 size_t len, reserve_len;
2914
f613e3e6 2915 /*
92d9f5e6
MD		 2916 * Ensure we support mutiple get_next / put sequences followed by
2917 * put_next. The metadata cache lock protects reading the metadata
2918 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2919 * "flush" operations on the buffer invoked by different processes.
2920 * Moreover, since the metadata cache memory can be reallocated, we
2921 * need to have exclusive access against updates even though we only
2922 * read it.
f613e3e6 2923 */
92d9f5e6 2924 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2925 WARN_ON(stream->metadata_in < stream->metadata_out);
2926 if (stream->metadata_in != stream->metadata_out)
de23d59d 2927 goto end;
f613e3e6 2928
9616f0bf
JD		 2929 /* Metadata regenerated, change the version. */
2930 if (stream->metadata_cache->version != stream->version)
2931 stream->version = stream->metadata_cache->version;
2932
d83004aa 2933 len = stream->metadata_cache->metadata_written -
f613e3e6 2934 stream->metadata_in;
9de2c215 2935 if (!len)
de23d59d 2936 goto end;
d83004aa 2937 reserve_len = min_t(size_t,
4a399b76 2938 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2939 len);
a775608d 2940 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2941 sizeof(char), NULL);
d83004aa
JD		 2942 /*
2943 * If reservation failed, return an error to the caller.
2944 */
c2fb9c1c 2945 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2946 if (ret != 0) {
2947 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2948 stream->coherent = false;
d83004aa
JD		 2949 goto end;
2950 }
b3b8072b 2951 stream->transport->ops.event_write(&ctx,
f613e3e6 2952 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2953 reserve_len, 1);
b3b8072b 2954 stream->transport->ops.event_commit(&ctx);
f613e3e6 2955 stream->metadata_in += reserve_len;
3e75e2a7 2956 if (reserve_len < len)
8b97fd42
MD		 2957 stream->coherent = false;
2958 else
2959 stream->coherent = true;
d83004aa
JD		 2960 ret = reserve_len;
2961
2962end:
8b97fd42
MD		 2963 if (coherent)
2964 *coherent = stream->coherent;
92d9f5e6 2965 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2966 return ret;
2967}
2968
8b97fd42 2969static
8cdc1a81 2970void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2971{
8cdc1a81
MD		 2972 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2973 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2974}
2975
2976static
8cdc1a81 2977void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2978{
8cdc1a81
MD		 2979 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2980 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2981 struct lttng_metadata_stream *stream;
2982
8cdc1a81 2983 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2984 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2985 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2986 }
8b97fd42
MD		 2987}
2988
d83004aa
JD		 2989/*
2990 * Write the metadata to the metadata cache.
2991 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2992 * The metadata cache lock protects us from concurrent read access from
2993 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2994 * The content of the printf is printed as a single atomic metadata
2995 * transaction.
d83004aa 2996 */
8cdc1a81 2997int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2998 const char *fmt, ...)
2999{
c099397a 3000 char *str;
d83004aa 3001 size_t len;
c099397a
MD		 3002 va_list ap;
3003
585e5dcc 3004 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 3005
3006 va_start(ap, fmt);
3007 str = kvasprintf(GFP_KERNEL, fmt, ap);
3008 va_end(ap);
3009 if (!str)
3010 return -ENOMEM;
3011
1ec3f75a 3012 len = strlen(str);
8cdc1a81
MD		 3013 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3014 if (session->priv->metadata_cache->metadata_written + len >
3015 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 3016 char *tmp_cache_realloc;
3017 unsigned int tmp_cache_alloc_size;
3018
3019 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 3020 session->priv->metadata_cache->cache_alloc + len,
3021 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 3022 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 3023 if (!tmp_cache_realloc)
3024 goto err;
8cdc1a81 3025 if (session->priv->metadata_cache->data) {
a606b6e8 3026 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 3027 session->priv->metadata_cache->data,
3028 session->priv->metadata_cache->cache_alloc);
3029 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 3030 }
3031
8cdc1a81
MD		 3032 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3033 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3034 }
8cdc1a81
MD		 3035 memcpy(session->priv->metadata_cache->data +
3036 session->priv->metadata_cache->metadata_written,
d83004aa 3037 str, len);
8cdc1a81 3038 session->priv->metadata_cache->metadata_written += len;
c099397a 3039 kfree(str);
d83004aa 3040
d83004aa
JD		 3041 return 0;
3042
3043err:
3044 kfree(str);
3045 return -ENOMEM;
c099397a
MD		 3046}
3047
f513b2bf 3048static
8cdc1a81 3049int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3050{
3051 size_t i;
3052
3053 for (i = 0; i < nesting; i++) {
3054 int ret;
3055
3056 ret = lttng_metadata_printf(session, " ");
3057 if (ret) {
3058 return ret;
3059 }
3060 }
3061 return 0;
3062}
3063
ceabb767 3064static
8cdc1a81 3065int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3066 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3067 size_t nesting)
3068{
3069 return lttng_metadata_printf(session, " _%s;\n", field->name);
3070}
3071
3072static
8cdc1a81 3073int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3074 const struct lttng_kernel_type_integer *type,
3075 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3076 size_t nesting)
3077{
3078 int ret;
3079
ceabb767
MD		 3080 ret = print_tabs(session, nesting);
3081 if (ret)
3082 return ret;
3083 ret = lttng_metadata_printf(session,
3084 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3085 type->size,
3086 type->alignment,
3087 type->signedness,
3088 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3089 ? "none"
437d5aa5 3090 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3091 ? "UTF8"
3092 : "ASCII",
437d5aa5 3093 type->base,
ceabb767 3094#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3095 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3096#else
437d5aa5 3097 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3098#endif
3099 );
3100 return ret;
3101}
3102
f513b2bf
MD		 3103/*
3104 * Must be called with sessions_mutex held.
3105 */
3106static
8cdc1a81 3107int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3108 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3109 size_t nesting)
3110{
51ef4536 3111 const char *prev_field_name = NULL;
f513b2bf
MD		 3112 int ret;
3113 uint32_t i, nr_fields;
ceabb767
MD		 3114 unsigned int alignment;
3115
f513b2bf
MD		 3116 ret = print_tabs(session, nesting);
3117 if (ret)
3118 return ret;
3119 ret = lttng_metadata_printf(session,
3120 "struct {\n");
3121 if (ret)
3122 return ret;
437d5aa5 3123 nr_fields = type->nr_fields;
f513b2bf 3124 for (i = 0; i < nr_fields; i++) {
437d5aa5 3125 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3126
437d5aa5 3127 iter_field = type->fields[i];
51ef4536 3128 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3129 if (ret)
3130 return ret;
3131 }
3132 ret = print_tabs(session, nesting);
3133 if (ret)
3134 return ret;
437d5aa5 3135 alignment = type->alignment;
ceabb767
MD		 3136 if (alignment) {
3137 ret = lttng_metadata_printf(session,
3138 "} align(%u)",
3139 alignment);
3140 } else {
3141 ret = lttng_metadata_printf(session,
3142 "}");
3143 }
f513b2bf
MD		 3144 return ret;
3145}
3146
3147/*
3148 * Must be called with sessions_mutex held.
3149 */
3150static
8cdc1a81 3151int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3152 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3153 size_t nesting)
3154{
3155 int ret;
3156
3157 ret = _lttng_struct_type_statedump(session,
437d5aa5 3158 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3159 if (ret)
3160 return ret;
ceabb767 3161 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3162}
3163
65c85aa6
MD		 3164/*
3165 * Must be called with sessions_mutex held.
3166 */
3167static
8cdc1a81 3168int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3169 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3170 size_t nesting,
3171 const char *prev_field_name)
65c85aa6 3172{
51ef4536 3173 const char *tag_name;
65c85aa6
MD		 3174 int ret;
3175 uint32_t i, nr_choices;
3176
51ef4536
MD		 3177 tag_name = type->tag_name;
3178 if (!tag_name)
3179 tag_name = prev_field_name;
3180 if (!tag_name)
3181 return -EINVAL;
ceabb767
MD		 3182 /*
3183 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3184 */
437d5aa5 3185 if (type->alignment != 0)
ceabb767 3186 return -EINVAL;
65c85aa6
MD		 3187 ret = print_tabs(session, nesting);
3188 if (ret)
3189 return ret;
3190 ret = lttng_metadata_printf(session,
3191 "variant <_%s> {\n",
51ef4536 3192 tag_name);
65c85aa6
MD		 3193 if (ret)
3194 return ret;
437d5aa5 3195 nr_choices = type->nr_choices;
65c85aa6 3196 for (i = 0; i < nr_choices; i++) {
437d5aa5 3197 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3198
437d5aa5 3199 iter_field = type->choices[i];
51ef4536 3200 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3201 if (ret)
3202 return ret;
3203 }
3204 ret = print_tabs(session, nesting);
3205 if (ret)
3206 return ret;
3207 ret = lttng_metadata_printf(session,
3208 "}");
3209 return ret;
3210}
3211
3212/*
3213 * Must be called with sessions_mutex held.
3214 */
3215static
8cdc1a81 3216int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3217 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3218 size_t nesting,
3219 const char *prev_field_name)
65c85aa6
MD		 3220{
3221 int ret;
3222
3223 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3224 lttng_kernel_get_type_variant(field->type), nesting,
3225 prev_field_name);
65c85aa6
MD		 3226 if (ret)
3227 return ret;
ceabb767 3228 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3229}
3230
f513b2bf
MD		 3231/*
3232 * Must be called with sessions_mutex held.
3233 */
3234static
8cdc1a81 3235int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3236 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3237 size_t nesting)
3238{
3239 int ret;
437d5aa5
MD		 3240 const struct lttng_kernel_type_array *array_type;
3241 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3242
437d5aa5
MD		 3243 array_type = lttng_kernel_get_type_array(field->type);
3244 WARN_ON_ONCE(!array_type);
ceabb767 3245
437d5aa5 3246 if (array_type->alignment) {
ceabb767 3247 ret = print_tabs(session, nesting);
f513b2bf
MD		 3248 if (ret)
3249 return ret;
ceabb767
MD		 3250 ret = lttng_metadata_printf(session,
3251 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3252 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3253 field->name);
3254 if (ret)
3255 return ret;
3256 }
3257 /*
3258 * Nested compound types: Only array of structures and variants are
3259 * currently supported.
3260 */
437d5aa5 3261 elem_type = array_type->elem_type;
12bb2edb
MD		 3262 switch (elem_type->type) {
3263 case lttng_kernel_type_integer:
437d5aa5
MD		 3264 case lttng_kernel_type_struct:
3265 case lttng_kernel_type_variant:
3266 ret = _lttng_type_statedump(session, elem_type,
3267 array_type->encoding, nesting);
65c85aa6
MD		 3268 if (ret)
3269 return ret;
3270 break;
ceabb767 3271
f513b2bf
MD		 3272 default:
3273 return -EINVAL;
3274 }
3275 ret = lttng_metadata_printf(session,
3276 " _%s[%u];\n",
3277 field->name,
437d5aa5 3278 array_type->length);
f513b2bf
MD		 3279 return ret;
3280}
3281
3282/*
3283 * Must be called with sessions_mutex held.
3284 */
3285static
8cdc1a81 3286int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3287 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3288 size_t nesting,
3289 const char *prev_field_name)
f513b2bf
MD		 3290{
3291 int ret;
3292 const char *length_name;
437d5aa5
MD		 3293 const struct lttng_kernel_type_sequence *sequence_type;
3294 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3295
437d5aa5
MD		 3296 sequence_type = lttng_kernel_get_type_sequence(field->type);
3297 WARN_ON_ONCE(!sequence_type);
f513b2bf 3298
437d5aa5 3299 length_name = sequence_type->length_name;
51ef4536
MD		 3300 if (!length_name)
3301 length_name = prev_field_name;
3302 if (!length_name)
3303 return -EINVAL;
ceabb767 3304
437d5aa5 3305 if (sequence_type->alignment) {
ceabb767 3306 ret = print_tabs(session, nesting);
f513b2bf
MD		 3307 if (ret)
3308 return ret;
ceabb767
MD		 3309 ret = lttng_metadata_printf(session,
3310 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3311 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3312 field->name);
3313 if (ret)
3314 return ret;
3315 }
3316
3317 /*
3318 * Nested compound types: Only array of structures and variants are
3319 * currently supported.
3320 */
437d5aa5 3321 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3322 switch (elem_type->type) {
3323 case lttng_kernel_type_integer:
437d5aa5
MD		 3324 case lttng_kernel_type_struct:
3325 case lttng_kernel_type_variant:
3326 ret = _lttng_type_statedump(session, elem_type,
3327 sequence_type->encoding, nesting);
65c85aa6
MD		 3328 if (ret)
3329 return ret;
3330 break;
ceabb767 3331
f513b2bf
MD		 3332 default:
3333 return -EINVAL;
3334 }
3335 ret = lttng_metadata_printf(session,
3336 " _%s[ _%s ];\n",
3337 field->name,
51ef4536 3338 length_name);
f513b2bf
MD		 3339 return ret;
3340}
3341
141ddf28
MD		 3342/*
3343 * Must be called with sessions_mutex held.
3344 */
3345static
8cdc1a81 3346int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3347 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3348 size_t nesting)
3349{
d96a4a7a 3350 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3351 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3352 int ret;
3353 unsigned int i, nr_entries;
3354
437d5aa5 3355 container_type = type->container_type;
12bb2edb 3356 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3357 ret = -EINVAL;
3358 goto end;
3359 }
437d5aa5 3360 enum_desc = type->desc;
141ddf28
MD		 3361 nr_entries = enum_desc->nr_entries;
3362
3363 ret = print_tabs(session, nesting);
3364 if (ret)
3365 goto end;
ceabb767
MD		 3366 ret = lttng_metadata_printf(session, "enum : ");
3367 if (ret)
3368 goto end;
437d5aa5
MD		 3369 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3370 lttng_kernel_string_encoding_none, 0);
141ddf28 3371 if (ret)
ceabb767
MD		 3372 goto end;
3373 ret = lttng_metadata_printf(session, " {\n");
3374 if (ret)
3375 goto end;
141ddf28
MD		 3376 /* Dump all entries */
3377 for (i = 0; i < nr_entries; i++) {
437d5aa5 3378 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3379 int j, len;
3380
3381 ret = print_tabs(session, nesting + 1);
3382 if (ret)
3383 goto end;
3384 ret = lttng_metadata_printf(session,
3385 "\"");
3386 if (ret)
3387 goto end;
3388 len = strlen(entry->string);
3389 /* Escape the character '"' */
3390 for (j = 0; j < len; j++) {
3391 char c = entry->string[j];
3392
3393 switch (c) {
3394 case '"':
3395 ret = lttng_metadata_printf(session,
3396 "\\\"");
3397 break;
3398 case '\\':
3399 ret = lttng_metadata_printf(session,
3400 "\\\\");
3401 break;
3402 default:
3403 ret = lttng_metadata_printf(session,
3404 "%c", c);
3405 break;
3406 }
3407 if (ret)
3408 goto end;
3409 }
08ad1061
PP		 3410 ret = lttng_metadata_printf(session, "\"");
3411 if (ret)
3412 goto end;
3413
3414 if (entry->options.is_auto) {
3415 ret = lttng_metadata_printf(session, ",\n");
3416 if (ret)
3417 goto end;
141ddf28 3418 } else {
7c559490
MD		 3419 ret = lttng_metadata_printf(session,
3420 " = ");
3421 if (ret)
3422 goto end;
3423 if (entry->start.signedness)
141ddf28 3424 ret = lttng_metadata_printf(session,
7c559490
MD		 3425 "%lld", (long long) entry->start.value);
3426 else
3427 ret = lttng_metadata_printf(session,
3428 "%llu", entry->start.value);
3429 if (ret)
3430 goto end;
3431 if (entry->start.signedness == entry->end.signedness &&
3432 entry->start.value
3433 == entry->end.value) {
141ddf28 3434 ret = lttng_metadata_printf(session,
7c559490
MD		 3435 ",\n");
3436 } else {
3437 if (entry->end.signedness) {
3438 ret = lttng_metadata_printf(session,
3439 " ... %lld,\n",
3440 (long long) entry->end.value);
3441 } else {
3442 ret = lttng_metadata_printf(session,
3443 " ... %llu,\n",
3444 entry->end.value);
3445 }
141ddf28 3446 }
7c559490
MD		 3447 if (ret)
3448 goto end;
141ddf28 3449 }
141ddf28
MD		 3450 }
3451 ret = print_tabs(session, nesting);
3452 if (ret)
3453 goto end;
ceabb767 3454 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3455end:
3456 return ret;
3457}
3458
d83004aa
JD		 3459/*
3460 * Must be called with sessions_mutex held.
3461 */
c099397a 3462static
8cdc1a81 3463int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3464 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3465 size_t nesting)
3466{
3467 int ret;
437d5aa5 3468 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3469
437d5aa5
MD		 3470 enum_type = lttng_kernel_get_type_enum(field->type);
3471 WARN_ON_ONCE(!enum_type);
3472 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3473 if (ret)
3474 return ret;
3475 return lttng_field_name_statedump(session, field, nesting);
3476}
3477
3478static
8cdc1a81 3479int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3480 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3481 size_t nesting)
3482{
3483 int ret;
3484
437d5aa5
MD		 3485 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3486 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3487 if (ret)
3488 return ret;
3489 return lttng_field_name_statedump(session, field, nesting);
3490}
3491
3492static
8cdc1a81 3493int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3494 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3495 size_t nesting)
3496{
3497 int ret;
3498
ceabb767
MD		 3499 /* Default encoding is UTF8 */
3500 ret = print_tabs(session, nesting);
3501 if (ret)
3502 return ret;
3503 ret = lttng_metadata_printf(session,
3504 "string%s",
437d5aa5 3505 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3506 " { encoding = ASCII; }" : "");
3507 return ret;
3508}
3509
3510static
8cdc1a81 3511int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3512 const struct lttng_kernel_event_field *field,
f513b2bf 3513 size_t nesting)
ceabb767 3514{
437d5aa5 3515 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3516 int ret;
3517
437d5aa5
MD		 3518 string_type = lttng_kernel_get_type_string(field->type);
3519 WARN_ON_ONCE(!string_type);
3520 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3521 if (ret)
3522 return ret;
3523 return lttng_field_name_statedump(session, field, nesting);
3524}
3525
3526/*
3527 * Must be called with sessions_mutex held.
3528 */
3529static
8cdc1a81 3530int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3531 const struct lttng_kernel_type_common *type,
3532 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3533 size_t nesting)
c099397a 3534{
c099397a 3535 int ret = 0;
c099397a 3536
12bb2edb
MD		 3537 switch (type->type) {
3538 case lttng_kernel_type_integer:
437d5aa5
MD		 3539 ret = _lttng_integer_type_statedump(session,
3540 lttng_kernel_get_type_integer(type),
3541 parent_encoding, nesting);
8070f5c0 3542 break;
437d5aa5
MD		 3543 case lttng_kernel_type_enum:
3544 ret = _lttng_enum_type_statedump(session,
3545 lttng_kernel_get_type_enum(type),
3546 nesting);
8070f5c0 3547 break;
12bb2edb 3548 case lttng_kernel_type_string:
437d5aa5
MD		 3549 ret = _lttng_string_type_statedump(session,
3550 lttng_kernel_get_type_string(type),
3551 nesting);
ceabb767 3552 break;
437d5aa5
MD		 3553 case lttng_kernel_type_struct:
3554 ret = _lttng_struct_type_statedump(session,
3555 lttng_kernel_get_type_struct(type),
3556 nesting);
8070f5c0 3557 break;
437d5aa5
MD		 3558 case lttng_kernel_type_variant:
3559 ret = _lttng_variant_type_statedump(session,
3560 lttng_kernel_get_type_variant(type),
51ef4536 3561 nesting, NULL);
ceabb767
MD		 3562 break;
3563
3564 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3565 case lttng_kernel_type_array:
3566 case lttng_kernel_type_sequence:
ceabb767
MD		 3567 default:
3568 WARN_ON_ONCE(1);
3569 return -EINVAL;
8070f5c0 3570 }
ceabb767
MD		 3571 return ret;
3572}
8070f5c0 3573
ceabb767
MD		 3574/*
3575 * Must be called with sessions_mutex held.
3576 */
3577static
8cdc1a81 3578int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3579 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3580 size_t nesting,
3581 const char **prev_field_name_p)
ceabb767 3582{
51ef4536 3583 const char *prev_field_name = NULL;
ceabb767 3584 int ret = 0;
27d2368e 3585
51ef4536
MD		 3586 if (prev_field_name_p)
3587 prev_field_name = *prev_field_name_p;
437d5aa5 3588 switch (field->type->type) {
12bb2edb 3589 case lttng_kernel_type_integer:
ceabb767
MD		 3590 ret = _lttng_integer_field_statedump(session, field, nesting);
3591 break;
437d5aa5 3592 case lttng_kernel_type_enum:
ceabb767 3593 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3594 break;
12bb2edb 3595 case lttng_kernel_type_string:
ceabb767 3596 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3597 break;
437d5aa5 3598 case lttng_kernel_type_struct:
ceabb767 3599 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3600 break;
437d5aa5 3601 case lttng_kernel_type_array:
ceabb767 3602 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3603 break;
437d5aa5 3604 case lttng_kernel_type_sequence:
51ef4536 3605 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3606 break;
437d5aa5 3607 case lttng_kernel_type_variant:
51ef4536 3608 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3609 break;
f513b2bf 3610
8070f5c0
MD		 3611 default:
3612 WARN_ON_ONCE(1);
3613 return -EINVAL;
3614 }
51ef4536
MD		 3615 if (prev_field_name_p)
3616 *prev_field_name_p = field->name;
8070f5c0
MD		 3617 return ret;
3618}
3619
3620static
8cdc1a81 3621int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3622 struct lttng_kernel_ctx *ctx)
8070f5c0 3623{
51ef4536 3624 const char *prev_field_name = NULL;
8070f5c0
MD		 3625 int ret = 0;
3626 int i;
3627
3628 if (!ctx)
3629 return 0;
3630 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3631 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3632
51ef4536 3633 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3634 if (ret)
3635 return ret;
3636 }
3637 return ret;
3638}
3639
3640static
8cdc1a81 3641int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3642 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3643{
51ef4536 3644 const char *prev_field_name = NULL;
a67ba386 3645 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3646 int ret = 0;
3647 int i;
3648
6c8c025b
MD		 3649 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3650 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3651
51ef4536 3652 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3653 if (ret)
3654 return ret;
c099397a
MD		 3655 }
3656 return ret;
3657}
3658
d83004aa
JD		 3659/*
3660 * Must be called with sessions_mutex held.
8b97fd42
MD		 3661 * The entire event metadata is printed as a single atomic metadata
3662 * transaction.
d83004aa 3663 */
c099397a 3664static
ee7e9a18 3665int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event)
c099397a 3666{
ee7e9a18
MD		 3667 struct lttng_kernel_event_recorder *event_recorder;
3668 struct lttng_kernel_channel_buffer *chan;
3669 struct lttng_kernel_session *session;
c099397a
MD		 3670 int ret = 0;
3671
ee7e9a18
MD		 3672 if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER)
3673 return 0;
3674 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3675 chan = event_recorder->chan;
3676 session = chan->parent.session;
3677
a67ba386 3678 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3679 return 0;
f7d06400 3680 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3681 return 0;
3682
8b97fd42
MD		 3683 lttng_metadata_begin(session);
3684
c099397a
MD		 3685 ret = lttng_metadata_printf(session,
3686 "event {\n"
ae734547 3687 " name = \"%s\";\n"
c099397a 3688 " id = %u;\n"
b9074a1b 3689 " stream_id = %u;\n",
a67ba386
MD		 3690 event_recorder->priv->parent.desc->event_name,
3691 event_recorder->priv->id,
f7d06400 3692 event_recorder->chan->priv->id);
c099397a
MD		 3693 if (ret)
3694 goto end;
3695
8070f5c0 3696 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3697 " fields := struct {\n"
3698 );
3699 if (ret)
3700 goto end;
3701
a67ba386 3702 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3703 if (ret)
3704 goto end;
3705
3706 /*
3707 * LTTng space reservation can only reserve multiples of the
3708 * byte size.
3709 */
3710 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3711 " };\n"
3712 "};\n\n");
c099397a
MD		 3713 if (ret)
3714 goto end;
3715
a67ba386 3716 event_recorder->priv->metadata_dumped = 1;
c099397a 3717end:
8b97fd42 3718 lttng_metadata_end(session);
c099397a
MD		 3719 return ret;
3720
3721}
3722
d83004aa
JD		 3723/*
3724 * Must be called with sessions_mutex held.
8b97fd42
MD		 3725 * The entire channel metadata is printed as a single atomic metadata
3726 * transaction.
d83004aa 3727 */
c099397a 3728static
8cdc1a81 3729int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3730 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3731{
3732 int ret = 0;
3733
f7d06400 3734 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3735 return 0;
d83004aa 3736
f7d06400 3737 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3738 return 0;
3739
8b97fd42
MD		 3740 lttng_metadata_begin(session);
3741
f7d06400 3742 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3743 ret = lttng_metadata_printf(session,
3744 "stream {\n"
3745 " id = %u;\n"
9115fbdc 3746 " event.header := %s;\n"
b9074a1b 3747 " packet.context := struct packet_context;\n",
f7d06400
MD		 3748 chan->priv->id,
3749 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3750 "struct event_header_large");
3751 if (ret)
3752 goto end;
3753
f7d06400 3754 if (chan->priv->ctx) {
b9074a1b
MD		 3755 ret = lttng_metadata_printf(session,
3756 " event.context := struct {\n");
3757 if (ret)
3758 goto end;
3759 }
f7d06400 3760 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3761 if (ret)
3762 goto end;
f7d06400 3763 if (chan->priv->ctx) {
b9074a1b
MD		 3764 ret = lttng_metadata_printf(session,
3765 " };\n");
3766 if (ret)
3767 goto end;
3768 }
8070f5c0
MD		 3769
3770 ret = lttng_metadata_printf(session,
b9074a1b 3771 "};\n\n");
8070f5c0 3772
f7d06400 3773 chan->priv->metadata_dumped = 1;
c099397a 3774end:
8b97fd42 3775 lttng_metadata_end(session);
c099397a
MD		 3776 return ret;
3777}
3778
d83004aa
JD		 3779/*
3780 * Must be called with sessions_mutex held.
3781 */
9115fbdc 3782static
8cdc1a81 3783int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3784{
3785 return lttng_metadata_printf(session,
3786 "struct packet_context {\n"
a3ccff4f
MD		 3787 " uint64_clock_monotonic_t timestamp_begin;\n"
3788 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3789 " uint64_t content_size;\n"
3790 " uint64_t packet_size;\n"
5b3cf4f9 3791 " uint64_t packet_seq_num;\n"
a9afe705 3792 " unsigned long events_discarded;\n"
9115fbdc 3793 " uint32_t cpu_id;\n"
c6dfdf6f 3794 "};\n\n"
9115fbdc
MD		 3795 );
3796}
3797
3798/*
3799 * Compact header:
3800 * id: range: 0 - 30.
3801 * id 31 is reserved to indicate an extended header.
3802 *
3803 * Large header:
3804 * id: range: 0 - 65534.
3805 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3806 *
3807 * Must be called with sessions_mutex held.
9115fbdc
MD		 3808 */
3809static
8cdc1a81 3810int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3811{
3812 return lttng_metadata_printf(session,
3813 "struct event_header_compact {\n"
3814 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3815 " variant <id> {\n"
3816 " struct {\n"
a3ccff4f 3817 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3818 " } compact;\n"
3819 " struct {\n"
3820 " uint32_t id;\n"
a3ccff4f 3821 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3822 " } extended;\n"
3823 " } v;\n"
3824 "} align(%u);\n"
3825 "\n"
3826 "struct event_header_large {\n"
3827 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3828 " variant <id> {\n"
3829 " struct {\n"
a3ccff4f 3830 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3831 " } compact;\n"
3832 " struct {\n"
3833 " uint32_t id;\n"
a3ccff4f 3834 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3835 " } extended;\n"
3836 " } v;\n"
3837 "} align(%u);\n\n",
a90917c3
MD		 3838 lttng_alignof(uint32_t) * CHAR_BIT,
3839 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3840 );
3841}
3842
a3ccff4f
MD		 3843 /*
3844 * Approximation of NTP time of day to clock monotonic correlation,
3845 * taken at start of trace.
3846 * Yes, this is only an approximation. Yes, we can (and will) do better
3847 * in future versions.
5283350b
MD		 3848 * This function may return a negative offset. It may happen if the
3849 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3850 *
3851 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3852 * y2038 compliant.
a3ccff4f
MD		 3853 */
3854static
8967b2a3 3855int64_t measure_clock_offset(void)
a3ccff4f 3856{
dcb93448 3857 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3858 uint64_t tcf = trace_clock_freq();
dcb93448 3859 int64_t offset;
a3ccff4f 3860 unsigned long flags;
3636085f
MJ		 3861#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3862 struct timespec64 rts = { 0, 0 };
3863#else
3864 struct timespec rts = { 0, 0 };
3865#endif
a3ccff4f
MD		 3866
3867 /* Disable interrupts to increase correlation precision. */
3868 local_irq_save(flags);
3869 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3870#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3871 ktime_get_real_ts64(&rts);
3872#else
216b6baa 3873 getnstimeofday(&rts);
3636085f 3874#endif
a3ccff4f
MD		 3875 monotonic[1] = trace_clock_read64();
3876 local_irq_restore(flags);
3877
dcb93448 3878 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3879 realtime = (uint64_t) rts.tv_sec * tcf;
3880 if (tcf == NSEC_PER_SEC) {
3881 realtime += rts.tv_nsec;
3882 } else {
3883 uint64_t n = rts.tv_nsec * tcf;
3884
3885 do_div(n, NSEC_PER_SEC);
3886 realtime += n;
3887 }
dcb93448 3888 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3889 return offset;
3890}
3891
3eb95be4 3892static
8cdc1a81 3893int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3894{
0f3eaad4 3895 int ret = 0;
3eb95be4
JR		 3896 size_t i;
3897 char cur;
3898
3899 i = 0;
3900 cur = string[i];
3901 while (cur != '\0') {
3902 switch (cur) {
3903 case '\n':
3904 ret = lttng_metadata_printf(session, "%s", "\\n");
3905 break;
3906 case '\\':
3907 case '"':
3908 ret = lttng_metadata_printf(session, "%c", '\\');
3909 if (ret)
3910 goto error;
3911 /* We still print the current char */
c190d76e 3912 lttng_fallthrough;
3eb95be4
JR		 3913 default:
3914 ret = lttng_metadata_printf(session, "%c", cur);
3915 break;
3916 }
3917
3918 if (ret)
3919 goto error;
3920
3921 cur = string[++i];
3922 }
3923error:
3924 return ret;
3925}
3926
3927static
8cdc1a81 3928int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3929 const char *field_value)
3eb95be4
JR		 3930{
3931 int ret;
3932
1c88f269 3933 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3934 if (ret)
3935 goto error;
3936
1c88f269 3937 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3938 if (ret)
3939 goto error;
3940
3941 ret = lttng_metadata_printf(session, "\";\n");
3942
3943error:
3944 return ret;
3945}
3946
c099397a
MD		 3947/*
3948 * Output metadata into this session's metadata buffers.
d83004aa 3949 * Must be called with sessions_mutex held.
c099397a
MD		 3950 */
3951static
8cdc1a81 3952int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3953{
8cdc1a81 3954 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3955 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3956 const char *product_uuid;
f7d06400 3957 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3958 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3959 int ret = 0;
3960
585e5dcc 3961 if (!LTTNG_READ_ONCE(session->active))
c099397a 3962 return 0;
8b97fd42
MD		 3963
3964 lttng_metadata_begin(session);
3965
8cdc1a81 3966 if (session->priv->metadata_dumped)
c099397a 3967 goto skip_session;
c099397a 3968
d793d5e1 3969 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3970 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3971 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3972 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3973 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3974 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3975
3976 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3977 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3978 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3979 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3980 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3981 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3982 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3983 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3984 "\n"
3985 "trace {\n"
3986 " major = %u;\n"
3987 " minor = %u;\n"
30bdb6e4 3988 " uuid = \"%s\";\n"
d793d5e1
MD		 3989 " byte_order = %s;\n"
3990 " packet.header := struct {\n"
3991 " uint32_t magic;\n"
1ec3f75a 3992 " uint8_t uuid[16];\n"
d793d5e1 3993 " uint32_t stream_id;\n"
5594698f 3994 " uint64_t stream_instance_id;\n"
0eb25f58 3995 " };\n"
d793d5e1 3996 "};\n\n",
a90917c3
MD		 3997 lttng_alignof(uint8_t) * CHAR_BIT,
3998 lttng_alignof(uint16_t) * CHAR_BIT,
3999 lttng_alignof(uint32_t) * CHAR_BIT,
4000 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 4001 sizeof(unsigned long) * CHAR_BIT,
4002 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 4003 CTF_SPEC_MAJOR,
4004 CTF_SPEC_MINOR,
d793d5e1 4005 uuid_s,
5214fa50 4006#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 4007 "be"
4008#else
4009 "le"
4010#endif
4011 );
4012 if (ret)
4013 goto end;
4014
99dc9597
MD		 4015 ret = lttng_metadata_printf(session,
4016 "env {\n"
a6058143 4017 " hostname = \"%s\";\n"
c6c9e10f 4018 " domain = \"kernel\";\n"
99dc9597 4019 " sysname = \"%s\";\n"
c6c9e10f
MD		 4020 " kernel_release = \"%s\";\n"
4021 " kernel_version = \"%s\";\n"
4022 " tracer_name = \"lttng-modules\";\n"
4023 " tracer_major = %d;\n"
4024 " tracer_minor = %d;\n"
4025 " tracer_patchlevel = %d;\n"
3eb95be4 4026 " trace_buffering_scheme = \"global\";\n",
3d0d43db 4027 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 4028 utsname()->sysname,
4029 utsname()->release,
c6c9e10f
MD		 4030 utsname()->version,
4031 LTTNG_MODULES_MAJOR_VERSION,
4032 LTTNG_MODULES_MINOR_VERSION,
4033 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 4034 );
4035 if (ret)
4036 goto end;
4037
8cdc1a81 4038 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4039 if (ret)
4040 goto end;
4041 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4042 session->priv->creation_time);
3eb95be4
JR		 4043 if (ret)
4044 goto end;
4045
c88f762e
GB		 4046 /* Add the product UUID to the 'env' section */
4047 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4048 if (product_uuid) {
4049 ret = lttng_metadata_printf(session,
4050 " product_uuid = \"%s\";\n",
4051 product_uuid
4052 );
4053 if (ret)
4054 goto end;
4055 }
4056
4057 /* Close the 'env' section */
3eb95be4
JR		 4058 ret = lttng_metadata_printf(session, "};\n\n");
4059 if (ret)
4060 goto end;
4061
a3ccff4f
MD		 4062 ret = lttng_metadata_printf(session,
4063 "clock {\n"
2754583e
MD		 4064 " name = \"%s\";\n",
4065 trace_clock_name()
a82c63f1
MD		 4066 );
4067 if (ret)
4068 goto end;
4069
4070 if (!trace_clock_uuid(clock_uuid_s)) {
4071 ret = lttng_metadata_printf(session,
7c27cb17 4072 " uuid = \"%s\";\n",
a82c63f1
MD		 4073 clock_uuid_s
4074 );
4075 if (ret)
4076 goto end;
4077 }
4078
4079 ret = lttng_metadata_printf(session,
2754583e 4080 " description = \"%s\";\n"
a3ccff4f
MD		 4081 " freq = %llu; /* Frequency, in Hz */\n"
4082 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4083 " offset = %lld;\n"
a3ccff4f 4084 "};\n\n",
2754583e 4085 trace_clock_description(),
a3ccff4f 4086 (unsigned long long) trace_clock_freq(),
8967b2a3 4087 (long long) measure_clock_offset()
a3ccff4f
MD		 4088 );
4089 if (ret)
4090 goto end;
4091
4092 ret = lttng_metadata_printf(session,
4093 "typealias integer {\n"
4094 " size = 27; align = 1; signed = false;\n"
2754583e 4095 " map = clock.%s.value;\n"
a3ccff4f
MD		 4096 "} := uint27_clock_monotonic_t;\n"
4097 "\n"
4098 "typealias integer {\n"
4099 " size = 32; align = %u; signed = false;\n"
2754583e 4100 " map = clock.%s.value;\n"
a3ccff4f
MD		 4101 "} := uint32_clock_monotonic_t;\n"
4102 "\n"
4103 "typealias integer {\n"
4104 " size = 64; align = %u; signed = false;\n"
2754583e 4105 " map = clock.%s.value;\n"
a3ccff4f 4106 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4107 trace_clock_name(),
a3ccff4f 4108 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4109 trace_clock_name(),
4110 lttng_alignof(uint64_t) * CHAR_BIT,
4111 trace_clock_name()
a3ccff4f
MD		 4112 );
4113 if (ret)
4114 goto end;
4115
a90917c3 4116 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4117 if (ret)
4118 goto end;
4119
a90917c3 4120 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4121 if (ret)
4122 goto end;
4123
c099397a 4124skip_session:
f7d06400
MD		 4125 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4126 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4127 if (ret)
4128 goto end;
4129 }
4130
f237aef8 4131 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
ee7e9a18 4132 ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent);
c099397a
MD		 4133 if (ret)
4134 goto end;
4135 }
8cdc1a81 4136 session->priv->metadata_dumped = 1;
c099397a 4137end:
8b97fd42 4138 lttng_metadata_end(session);
c099397a
MD		 4139 return ret;
4140}
4141
c0e31d2e 4142/**
a90917c3 4143 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4144 * @transport: transport structure
4145 *
4146 * Registers a transport which can be used as output to extract the data out of
4147 * LTTng. The module calling this registration function must ensure that no
4148 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4149 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4150 * is made visible to the transport function. This registration acts as a
263b6c88 4151 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4152 * after its registration must it synchronize the TLBs.
4153 */
a90917c3 4154void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4155{
4156 /*
4157 * Make sure no page fault can be triggered by the module about to be
4158 * registered. We deal with this here so we don't have to call
263b6c88 4159 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4160 */
263b6c88 4161 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4162
4163 mutex_lock(&sessions_mutex);
a90917c3 4164 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4165 mutex_unlock(&sessions_mutex);
4166}
a90917c3 4167EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4168
4169/**
a90917c3 4170 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4171 * @transport: transport structure
4172 */
a90917c3 4173void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4174{
4175 mutex_lock(&sessions_mutex);
4176 list_del(&transport->node);
4177 mutex_unlock(&sessions_mutex);
4178}
a90917c3 4179EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4180
a101fa10
MD		 4181void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4182{
4183 /*
4184 * Make sure no page fault can be triggered by the module about to be
4185 * registered. We deal with this here so we don't have to call
4186 * vmalloc_sync_mappings() in each module's init.
4187 */
4188 wrapper_vmalloc_sync_mappings();
4189
4190 mutex_lock(&sessions_mutex);
4191 list_add_tail(&transport->node, &lttng_counter_transport_list);
4192 mutex_unlock(&sessions_mutex);
4193}
4194EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4195
4196void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4197{
4198 mutex_lock(&sessions_mutex);
4199 list_del(&transport->node);
4200 mutex_unlock(&sessions_mutex);
4201}
4202EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4203
5f4c791e 4204#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4205
4206enum cpuhp_state lttng_hp_prepare;
4207enum cpuhp_state lttng_hp_online;
4208
4209static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4210{
4211 struct lttng_cpuhp_node *lttng_node;
4212
4213 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4214 switch (lttng_node->component) {
4215 case LTTNG_RING_BUFFER_FRONTEND:
4216 return 0;
4217 case LTTNG_RING_BUFFER_BACKEND:
4218 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4219 case LTTNG_RING_BUFFER_ITER:
4220 return 0;
4221 case LTTNG_CONTEXT_PERF_COUNTERS:
4222 return 0;
4223 default:
4224 return -EINVAL;
4225 }
4226}
4227
4228static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4229{
4230 struct lttng_cpuhp_node *lttng_node;
4231
4232 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4233 switch (lttng_node->component) {
4234 case LTTNG_RING_BUFFER_FRONTEND:
4235 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4236 case LTTNG_RING_BUFFER_BACKEND:
4237 return 0;
4238 case LTTNG_RING_BUFFER_ITER:
4239 return 0;
4240 case LTTNG_CONTEXT_PERF_COUNTERS:
4241 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4242 default:
4243 return -EINVAL;
4244 }
4245}
4246
4247static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4248{
4249 struct lttng_cpuhp_node *lttng_node;
4250
4251 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4252 switch (lttng_node->component) {
4253 case LTTNG_RING_BUFFER_FRONTEND:
4254 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4255 case LTTNG_RING_BUFFER_BACKEND:
4256 return 0;
4257 case LTTNG_RING_BUFFER_ITER:
4258 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4259 case LTTNG_CONTEXT_PERF_COUNTERS:
4260 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4261 default:
4262 return -EINVAL;
4263 }
4264}
4265
4266static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4267{
4268 struct lttng_cpuhp_node *lttng_node;
4269
4270 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4271 switch (lttng_node->component) {
4272 case LTTNG_RING_BUFFER_FRONTEND:
4273 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4274 case LTTNG_RING_BUFFER_BACKEND:
4275 return 0;
4276 case LTTNG_RING_BUFFER_ITER:
4277 return 0;
4278 case LTTNG_CONTEXT_PERF_COUNTERS:
4279 return 0;
4280 default:
4281 return -EINVAL;
4282 }
4283}
4284
4285static int __init lttng_init_cpu_hotplug(void)
4286{
4287 int ret;
4288
4289 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4290 lttng_hotplug_prepare,
4291 lttng_hotplug_dead);
4292 if (ret < 0) {
4293 return ret;
4294 }
4295 lttng_hp_prepare = ret;
4296 lttng_rb_set_hp_prepare(ret);
4297
4298 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4299 lttng_hotplug_online,
4300 lttng_hotplug_offline);
4301 if (ret < 0) {
4302 cpuhp_remove_multi_state(lttng_hp_prepare);
4303 lttng_hp_prepare = 0;
4304 return ret;
4305 }
4306 lttng_hp_online = ret;
4307 lttng_rb_set_hp_online(ret);
4308
4309 return 0;
4310}
4311
4312static void __exit lttng_exit_cpu_hotplug(void)
4313{
4314 lttng_rb_set_hp_online(0);
4315 cpuhp_remove_multi_state(lttng_hp_online);
4316 lttng_rb_set_hp_prepare(0);
4317 cpuhp_remove_multi_state(lttng_hp_prepare);
4318}
4319
5f4c791e 4320#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4321static int lttng_init_cpu_hotplug(void)
4322{
4323 return 0;
4324}
4325static void lttng_exit_cpu_hotplug(void)
4326{
4327}
5f4c791e 4328#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4329
a90917c3 4330static int __init lttng_events_init(void)
4e3c1b9b 4331{
1c25284c
MD		 4332 int ret;
4333
453b2495
JD		 4334 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4335 if (ret)
4336 return ret;
389d7070 4337 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4338 if (ret)
4339 return ret;
4340 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4341 if (ret)
4342 return ret;
4343 ret = lttng_probes_init();
389d7070
MD		 4344 if (ret)
4345 return ret;
07dfc1d0 4346 ret = lttng_context_init();
20591cf7
MD		 4347 if (ret)
4348 return ret;
07dfc1d0
MD		 4349 ret = lttng_tracepoint_init();
4350 if (ret)
4351 goto error_tp;
a67ba386
MD		 4352 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4353 if (!event_recorder_cache) {
20591cf7 4354 ret = -ENOMEM;
a67ba386 4355 goto error_kmem_event_recorder;
dffef45d 4356 }
a67ba386
MD		 4357 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4358 if (!event_recorder_private_cache) {
4359 ret = -ENOMEM;
4360 goto error_kmem_event_recorder_private;
4361 }
4362 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4363 if (!event_notifier_cache) {
4364 ret = -ENOMEM;
4365 goto error_kmem_event_notifier;
20591cf7 4366 }
a67ba386
MD		 4367 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4368 if (!event_notifier_private_cache) {
4369 ret = -ENOMEM;
4370 goto error_kmem_event_notifier_private;
4371 }
80996790 4372 ret = lttng_abi_init();
02119ee5
MD		 4373 if (ret)
4374 goto error_abi;
0c956676
MD		 4375 ret = lttng_logger_init();
4376 if (ret)
4377 goto error_logger;
1e367326
MD		 4378 ret = lttng_init_cpu_hotplug();
4379 if (ret)
4380 goto error_hotplug;
101215b7 4381 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4382 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4383 __stringify(LTTNG_MODULES_MINOR_VERSION),
4384 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4385 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4386 LTTNG_VERSION_NAME,
4387#ifdef LTTNG_EXTRA_VERSION_GIT
4388 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4389#else
4390 "",
4391#endif
4392#ifdef LTTNG_EXTRA_VERSION_NAME
4393 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4394#else
4395 "");
4396#endif
c1551e57
MJ		 4397#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4398 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4399#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4400 return 0;
0c956676 4401
1e367326
MD		 4402error_hotplug:
4403 lttng_logger_exit();
0c956676
MD		 4404error_logger:
4405 lttng_abi_exit();
02119ee5 4406error_abi:
a67ba386
MD		 4407 kmem_cache_destroy(event_notifier_private_cache);
4408error_kmem_event_notifier_private:
dffef45d
FD		 4409 kmem_cache_destroy(event_notifier_cache);
4410error_kmem_event_notifier:
a67ba386
MD		 4411 kmem_cache_destroy(event_recorder_private_cache);
4412error_kmem_event_recorder_private:
4413 kmem_cache_destroy(event_recorder_cache);
4414error_kmem_event_recorder:
20591cf7 4415 lttng_tracepoint_exit();
07dfc1d0
MD		 4416error_tp:
4417 lttng_context_exit();
101215b7 4418 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4419 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4420 __stringify(LTTNG_MODULES_MINOR_VERSION),
4421 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4422 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4423 LTTNG_VERSION_NAME,
4424#ifdef LTTNG_EXTRA_VERSION_GIT
4425 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4426#else
4427 "",
4428#endif
4429#ifdef LTTNG_EXTRA_VERSION_NAME
4430 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4431#else
4432 "");
4433#endif
1c25284c 4434 return ret;
4e3c1b9b
MD		 4435}
4436
a90917c3 4437module_init(lttng_events_init);
11b5a3c2 4438
a90917c3 4439static void __exit lttng_events_exit(void)
4e3c1b9b 4440{
8cdc1a81 4441 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4442
1e367326 4443 lttng_exit_cpu_hotplug();
0c956676 4444 lttng_logger_exit();
80996790 4445 lttng_abi_exit();
8cdc1a81
MD		 4446 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4447 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4448 kmem_cache_destroy(event_recorder_cache);
4449 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4450 kmem_cache_destroy(event_notifier_cache);
a67ba386 4451 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4452 lttng_tracepoint_exit();
07dfc1d0 4453 lttng_context_exit();
101215b7 4454 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4455 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4456 __stringify(LTTNG_MODULES_MINOR_VERSION),
4457 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4458 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4459 LTTNG_VERSION_NAME,
4460#ifdef LTTNG_EXTRA_VERSION_GIT
4461 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4462#else
4463 "",
4464#endif
4465#ifdef LTTNG_EXTRA_VERSION_NAME
4466 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4467#else
4468 "");
4469#endif
4e3c1b9b 4470}
92e94819 4471
a90917c3 4472module_exit(lttng_events_exit);
11b5a3c2 4473
7ca11e77 4474#include <generated/patches.h>
101215b7
MJ		 4475#ifdef LTTNG_EXTRA_VERSION_GIT
4476MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4477#endif
4478#ifdef LTTNG_EXTRA_VERSION_NAME
4479MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4480#endif
92e94819
MD		 4481MODULE_LICENSE("GPL and additional rights");
4482MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4483MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4484MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4485 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4486 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4487 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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