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Refactoring: introduce lttng_kernel_event_id_available
[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
51d248b5
MD		 867static
868bool lttng_kernel_event_id_available(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_channel_buffer *chan = event_recorder_enabler->chan;
879
880 switch (itype) {
881 case LTTNG_KERNEL_ABI_TRACEPOINT:
882 lttng_fallthrough;
883 case LTTNG_KERNEL_ABI_KPROBE:
884 lttng_fallthrough;
885 case LTTNG_KERNEL_ABI_SYSCALL:
886 lttng_fallthrough;
887 case LTTNG_KERNEL_ABI_UPROBE:
888 if (chan->priv->free_event_id == -1U)
889 return false;
890 return true;
891 case LTTNG_KERNEL_ABI_KRETPROBE:
892 /* kretprobes require 2 event IDs. */
893 if (chan->priv->free_event_id >= -2U)
894 return false;
895 return true;
896 default:
897 WARN_ON_ONCE(1);
898 return false;
899 }
900 }
901 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
902 return true;
903 default:
904 WARN_ON_ONCE(1);
905 return false;
906 }
907}
908
756a020c
MD		 909static
910struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler)
911{
912 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
913 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
914
915 switch (event_enabler->enabler_type) {
916 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
917 {
918 struct lttng_event_recorder_enabler *event_recorder_enabler =
919 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
920 struct lttng_kernel_event_recorder *event_recorder;
921 struct lttng_kernel_event_recorder_private *event_recorder_priv;
922 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
923
924 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
925 if (!event_recorder)
926 return NULL;
927 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
928 if (!event_recorder_priv) {
929 kmem_cache_free(event_recorder_private_cache, event_recorder);
930 return NULL;
931 }
932 event_recorder_priv->pub = event_recorder;
933 event_recorder_priv->parent.pub = &event_recorder->parent;
934 event_recorder->priv = event_recorder_priv;
935 event_recorder->parent.priv = &event_recorder_priv->parent;
936
937 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
938 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
939 event_recorder->priv->parent.instrumentation = itype;
940 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
941 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
942
943 event_recorder->chan = chan;
944 event_recorder->priv->id = chan->priv->free_event_id++;
945 return &event_recorder->parent;
946 }
947 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
948 {
949 struct lttng_event_notifier_enabler *event_notifier_enabler =
950 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
951 struct lttng_kernel_event_notifier *event_notifier;
952 struct lttng_kernel_event_notifier_private *event_notifier_priv;
953
954 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
955 if (!event_notifier)
956 return NULL;
957 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
958 if (!event_notifier_priv) {
959 kmem_cache_free(event_notifier_private_cache, event_notifier);
960 return NULL;
961 }
962 event_notifier_priv->pub = event_notifier;
963 event_notifier_priv->parent.pub = &event_notifier->parent;
964 event_notifier->priv = event_notifier_priv;
965 event_notifier->parent.priv = &event_notifier_priv->parent;
966
967 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
968 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
969 event_notifier->priv->parent.instrumentation = itype;
970 event_notifier->priv->parent.user_token = event_enabler->user_token;
971 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
972 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
973
974 event_notifier->priv->group = event_notifier_enabler->group;
975 event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index;
976 event_notifier->priv->num_captures = 0;
977 event_notifier->notification_send = lttng_event_notifier_notification_send;
978 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
979 return &event_notifier->parent;
980 }
981 default:
982 return NULL;
983 }
984}
985
986static
987void lttng_kernel_event_free(struct lttng_kernel_event_common *event)
988{
989 switch (event->type) {
990 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
991 {
992 struct lttng_kernel_event_recorder *event_recorder =
993 container_of(event, struct lttng_kernel_event_recorder, parent);
994
995 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
996 kmem_cache_free(event_recorder_cache, event_recorder);
997 break;
998 }
999 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1000 {
1001 struct lttng_kernel_event_notifier *event_notifier =
1002 container_of(event, struct lttng_kernel_event_notifier, parent);
1003
1004 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1005 kmem_cache_free(event_notifier_cache, event_notifier);
1006 break;
1007 }
1008 default:
1009 WARN_ON_ONCE(1);
1010 }
1011}
a101fa10 1012
ccefc7ab
MD		 1013static
1014int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event)
1015{
1016 switch (event->type) {
1017 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1018 return 0;
1019 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1020 {
1021 struct lttng_kernel_event_notifier *event_notifier =
1022 container_of(event, struct lttng_kernel_event_notifier, parent);
1023 struct lttng_counter *error_counter;
1024 struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group;
1025 size_t dimension_index[1];
1026 int ret;
1027
1028 /*
1029 * Clear the error counter bucket. The sessiond keeps track of which
1030 * bucket is currently in use. We trust it. The session lock
1031 * synchronizes against concurrent creation of the error
1032 * counter.
1033 */
1034 error_counter = event_notifier_group->error_counter;
1035 if (!error_counter)
1036 return 0;
1037 /*
1038 * Check that the index is within the boundary of the counter.
1039 */
1040 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
1041 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1042 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1043 return -EINVAL;
1044 }
1045
1046 dimension_index[0] = event_notifier->priv->error_counter_index;
1047 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1048 if (ret) {
1049 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1050 event_notifier->priv->error_counter_index);
1051 return -EINVAL;
1052 }
1053 return 0;
1054 }
1055 default:
1056 return -EINVAL;
1057 }
1058}
1059
e5382b6d
MD		 1060/*
1061 * Supports event creation while tracing session is active.
3c997079 1062 * Needs to be called with sessions mutex held.
e5382b6d 1063 */
83006ee0 1064static
1ae083ba 1065struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 1066 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 1067{
0def9170 1068 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
19b98250 1069 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent);
5b9817ae 1070 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
def1e304 1071 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1072 struct lttng_kernel_event_common_private *event_priv;
756a020c 1073 struct lttng_kernel_event_common *event;
756a020c 1074 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 1075 const char *event_name;
1076 struct hlist_head *head;
3d084699 1077 int ret;
4e3c1b9b 1078
51d248b5 1079 if (!lttng_kernel_event_id_available(&event_enabler->parent)) {
4cf0bf51 1080 ret = -EMFILE;
e5382b6d 1081 goto full;
abc0446a 1082 }
3c997079
MD		 1083
1084 switch (itype) {
606828e4 1085 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1086 event_name = event_desc->event_name;
3c997079 1087 break;
b4a75708 1088
c190d76e
MJ		 1089 case LTTNG_KERNEL_ABI_KPROBE:
1090 lttng_fallthrough;
1091 case LTTNG_KERNEL_ABI_UPROBE:
1092 lttng_fallthrough;
1093 case LTTNG_KERNEL_ABI_KRETPROBE:
1094 lttng_fallthrough;
606828e4 1095 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 1096 event_name = event_param->name;
1097 break;
b4a75708 1098
c190d76e
MJ		 1099 case LTTNG_KERNEL_ABI_FUNCTION:
1100 lttng_fallthrough;
1101 case LTTNG_KERNEL_ABI_NOOP:
1102 lttng_fallthrough;
3c997079
MD		 1103 default:
1104 WARN_ON_ONCE(1);
1105 ret = -EINVAL;
1106 goto type_error;
1107 }
4a11ef1c 1108
0def9170 1109 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1110 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
0d223dc6 1111 if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) {
3c997079
MD		 1112 ret = -EEXIST;
1113 goto exist;
abc0446a
MD		 1114 }
1115 }
3c997079 1116
756a020c
MD		 1117 event = lttng_kernel_event_alloc(&event_enabler->parent);
1118 if (!event) {
4cf0bf51 1119 ret = -ENOMEM;
756a020c 1120 goto alloc_error;
abc0446a 1121 }
756a020c 1122 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3c997079
MD		 1123
1124 switch (itype) {
606828e4 1125 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 1126 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1127 event->enabled = 0;
1128 event->priv->registered = 0;
1129 event->priv->desc = lttng_event_desc_get(event_name);
1130 if (!event->priv->desc) {
4cf0bf51 1131 ret = -ENOENT;
d3dbe23c 1132 goto register_error;
abc0446a 1133 }
3c997079
MD		 1134 /* Populate lttng_event structure before event registration. */
1135 smp_wmb();
baf20995 1136 break;
b4a75708 1137
606828e4 1138 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 1139 /*
1140 * Needs to be explicitly enabled after creation, since
1141 * we may want to apply filters.
1142 */
7cd0f696
MD		 1143 event->enabled = 0;
1144 event->priv->registered = 1;
3c997079
MD		 1145 /*
1146 * Populate lttng_event structure before event
1147 * registration.
1148 */
1149 smp_wmb();
8bf17deb 1150 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 1151 event_param->u.kprobe.symbol_name,
1152 event_param->u.kprobe.offset,
1153 event_param->u.kprobe.addr,
7cd0f696 1154 event);
abc0446a 1155 if (ret) {
4cf0bf51 1156 ret = -EINVAL;
d6d808f3 1157 goto register_error;
abc0446a 1158 }
7cd0f696 1159 ret = try_module_get(event->priv->desc->owner);
edeb3137 1160 WARN_ON_ONCE(!ret);
d6d808f3 1161 break;
b4a75708 1162
606828e4 1163 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 1164 {
756a020c 1165 struct lttng_kernel_event_common *event_return;
7371f44c
MD		 1166
1167 /* kretprobe defines 2 events */
a0493bef
MD		 1168 /*
1169 * Needs to be explicitly enabled after creation, since
1170 * we may want to apply filters.
1171 */
756a020c
MD		 1172 event->enabled = 0;
1173 event->priv->registered = 1;
a67ba386 1174
756a020c
MD		 1175 event_return = lttng_kernel_event_alloc(&event_enabler->parent);
1176 if (!event) {
a67ba386 1177 ret = -ENOMEM;
756a020c 1178 goto alloc_error;
a67ba386 1179 }
756a020c
MD		 1180
1181 event_return->enabled = 0;
1182 event_return->priv->registered = 1;
1183
7371f44c 1184 /*
a90917c3 1185 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1186 */
1187 smp_wmb();
3c997079 1188 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1189 event_param->u.kretprobe.symbol_name,
1190 event_param->u.kretprobe.offset,
1191 event_param->u.kretprobe.addr,
756a020c 1192 event, event_return);
7371f44c 1193 if (ret) {
756a020c 1194 lttng_kernel_event_free(event_return);
4cf0bf51 1195 ret = -EINVAL;
7371f44c
MD		 1196 goto register_error;
1197 }
1198 /* Take 2 refs on the module: one per event. */
756a020c 1199 ret = try_module_get(event->priv->desc->owner);
7371f44c 1200 WARN_ON_ONCE(!ret);
756a020c 1201 ret = try_module_get(event_return->priv->desc->owner);
7371f44c 1202 WARN_ON_ONCE(!ret);
ee7e9a18 1203 ret = _lttng_event_recorder_metadata_statedump(event_return);
abc0446a 1204 WARN_ON_ONCE(ret > 0);
7371f44c 1205 if (ret) {
756a020c 1206 lttng_kernel_event_free(event_return);
7cd0f696
MD		 1207 module_put(event_return->priv->desc->owner);
1208 module_put(event->priv->desc->owner);
7371f44c
MD		 1209 goto statedump_error;
1210 }
19b98250 1211 list_add(&event_return->priv->node, event_list_head);
7371f44c
MD		 1212 break;
1213 }
b4a75708 1214
606828e4 1215 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1216 /*
1217 * Needs to be explicitly enabled after creation, since
1218 * we may want to apply filters.
1219 */
7cd0f696
MD		 1220 event->enabled = 0;
1221 event->priv->registered = 0;
1222 event->priv->desc = event_desc;
badfe9f5 1223 switch (event_param->u.syscall.entryexit) {
606828e4 1224 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1225 ret = -EINVAL;
1226 goto register_error;
606828e4 1227 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1228 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1229 break;
606828e4 1230 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1231 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1232 break;
1233 }
1234 switch (event_param->u.syscall.abi) {
606828e4 1235 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1236 ret = -EINVAL;
1237 goto register_error;
606828e4 1238 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1239 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1240 break;
606828e4 1241 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1242 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1243 break;
1244 }
7cd0f696 1245 if (!event->priv->desc) {
4cf0bf51 1246 ret = -EINVAL;
259b6cb3 1247 goto register_error;
abc0446a 1248 }
1ec65de1 1249 break;
b4a75708 1250
606828e4 1251 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1252 /*
1253 * Needs to be explicitly enabled after creation, since
1254 * we may want to apply filters.
1255 */
7cd0f696
MD		 1256 event->enabled = 0;
1257 event->priv->registered = 1;
3aed4dca 1258
a344f64b
FD		 1259 /*
1260 * Populate lttng_event structure before event
1261 * registration.
1262 */
1263 smp_wmb();
149b9a9d 1264
83b802dc 1265 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1266 event_param->u.uprobe.fd,
7cd0f696 1267 event);
149b9a9d
YB		 1268 if (ret)
1269 goto register_error;
7cd0f696 1270 ret = try_module_get(event->priv->desc->owner);
149b9a9d
YB		 1271 WARN_ON_ONCE(!ret);
1272 break;
b4a75708 1273
c190d76e
MJ		 1274 case LTTNG_KERNEL_ABI_FUNCTION:
1275 lttng_fallthrough;
1276 case LTTNG_KERNEL_ABI_NOOP:
1277 lttng_fallthrough;
baf20995
MD		 1278 default:
1279 WARN_ON_ONCE(1);
4cf0bf51 1280 ret = -EINVAL;
df07930b 1281 goto register_error;
baf20995 1282 }
ee7e9a18 1283 ret = _lttng_event_recorder_metadata_statedump(event);
abc0446a
MD		 1284 WARN_ON_ONCE(ret > 0);
1285 if (ret) {
c099397a 1286 goto statedump_error;
abc0446a 1287 }
7cd0f696 1288 hlist_add_head(&event->priv->hlist_node, head);
19b98250 1289 list_add(&event->priv->node, event_list_head);
a67ba386 1290 return event_recorder;
4e3c1b9b 1291
c099397a 1292statedump_error:
259b6cb3 1293 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1294register_error:
756a020c
MD		 1295 lttng_kernel_event_free(event);
1296alloc_error:
4e3c1b9b 1297exist:
3c997079 1298type_error:
e5382b6d 1299full:
4cf0bf51 1300 return ERR_PTR(ret);
4e3c1b9b
MD		 1301}
1302
83006ee0
MD		 1303static
1304struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler,
1bbb5b2d 1305 const struct lttng_kernel_event_desc *event_desc)
dffef45d 1306{
0def9170 1307 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
19b98250 1308 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent);
1bbb5b2d 1309 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
1bbb5b2d 1310 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1311 struct lttng_kernel_event_common_private *event_priv;
756a020c 1312 struct lttng_kernel_event_common *event;
756a020c 1313 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1314 const char *event_name;
1315 struct hlist_head *head;
1316 int ret;
1317
1318 switch (itype) {
606828e4 1319 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1320 event_name = event_desc->event_name;
b01155ba 1321 break;
b4a75708 1322
c190d76e
MJ		 1323 case LTTNG_KERNEL_ABI_KPROBE:
1324 lttng_fallthrough;
1325 case LTTNG_KERNEL_ABI_UPROBE:
1326 lttng_fallthrough;
606828e4 1327 case LTTNG_KERNEL_ABI_SYSCALL:
1bbb5b2d 1328 event_name = event_param->name;
2b16f0c9 1329 break;
b4a75708 1330
c190d76e
MJ		 1331 case LTTNG_KERNEL_ABI_KRETPROBE:
1332 lttng_fallthrough;
1333 case LTTNG_KERNEL_ABI_FUNCTION:
1334 lttng_fallthrough;
1335 case LTTNG_KERNEL_ABI_NOOP:
1336 lttng_fallthrough;
dffef45d
FD		 1337 default:
1338 WARN_ON_ONCE(1);
1339 ret = -EINVAL;
1340 goto type_error;
1341 }
1342
0def9170 1343 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1344 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
0d223dc6 1345 if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) {
dffef45d
FD		 1346 ret = -EEXIST;
1347 goto exist;
1348 }
1349 }
1350
756a020c
MD		 1351 event = lttng_kernel_event_alloc(&event_enabler->parent);
1352 if (!event) {
a67ba386 1353 ret = -ENOMEM;
756a020c 1354 goto alloc_error;
a67ba386 1355 }
756a020c 1356 event_notifier = container_of(event, struct lttng_kernel_event_notifier, parent);
dffef45d
FD		 1357
1358 switch (itype) {
606828e4 1359 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1360 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1361 event->enabled = 0;
1362 event->priv->registered = 0;
1363 event->priv->desc = lttng_event_desc_get(event_name);
1364 if (!event->priv->desc) {
dffef45d
FD		 1365 ret = -ENOENT;
1366 goto register_error;
1367 }
1368 /* Populate lttng_event_notifier structure before event registration. */
1369 smp_wmb();
1370 break;
b4a75708 1371
606828e4 1372 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1373 /*
1374 * Needs to be explicitly enabled after creation, since
1375 * we may want to apply filters.
1376 */
7cd0f696
MD		 1377 event->enabled = 0;
1378 event->priv->registered = 1;
2b16f0c9
FD		 1379 /*
1380 * Populate lttng_event_notifier structure before event
1381 * registration.
1382 */
1383 smp_wmb();
1bbb5b2d
MD		 1384 ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name,
1385 event_param->u.kprobe.symbol_name,
1386 event_param->u.kprobe.offset,
1387 event_param->u.kprobe.addr,
7cd0f696 1388 event);
2b16f0c9
FD		 1389 if (ret) {
1390 ret = -EINVAL;
1391 goto register_error;
1392 }
7cd0f696 1393 ret = try_module_get(event->priv->desc->owner);
2b16f0c9
FD		 1394 WARN_ON_ONCE(!ret);
1395 break;
b4a75708 1396
606828e4 1397 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1398 /*
1399 * Needs to be explicitly enabled after creation, since
1400 * we may want to apply filters.
1401 */
7cd0f696
MD		 1402 event->enabled = 0;
1403 event->priv->registered = 0;
1404 event->priv->desc = event_desc;
1bbb5b2d 1405 switch (event_param->u.syscall.entryexit) {
606828e4 1406 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1407 ret = -EINVAL;
1408 goto register_error;
606828e4 1409 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1410 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1411 break;
606828e4 1412 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1413 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1414 break;
1415 }
1bbb5b2d 1416 switch (event_param->u.syscall.abi) {
606828e4 1417 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1418 ret = -EINVAL;
1419 goto register_error;
606828e4 1420 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1421 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1422 break;
606828e4 1423 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1424 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1425 break;
1426 }
1427
7cd0f696 1428 if (!event->priv->desc) {
8a8ac9a8
FD		 1429 ret = -EINVAL;
1430 goto register_error;
1431 }
1432 break;
b4a75708 1433
606828e4 1434 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1435 /*
1436 * Needs to be explicitly enabled after creation, since
1437 * we may want to apply filters.
1438 */
7cd0f696
MD		 1439 event->enabled = 0;
1440 event->priv->registered = 1;
9de67196
FD		 1441
1442 /*
1443 * Populate lttng_event_notifier structure before
1444 * event_notifier registration.
1445 */
1446 smp_wmb();
1447
1bbb5b2d
MD		 1448 ret = lttng_uprobes_register_event(event_param->name,
1449 event_param->u.uprobe.fd,
7cd0f696 1450 event);
9de67196
FD		 1451 if (ret)
1452 goto register_error;
7cd0f696 1453 ret = try_module_get(event->priv->desc->owner);
9de67196
FD		 1454 WARN_ON_ONCE(!ret);
1455 break;
b4a75708 1456
c190d76e
MJ		 1457 case LTTNG_KERNEL_ABI_KRETPROBE:
1458 lttng_fallthrough;
1459 case LTTNG_KERNEL_ABI_FUNCTION:
1460 lttng_fallthrough;
1461 case LTTNG_KERNEL_ABI_NOOP:
1462 lttng_fallthrough;
dffef45d
FD		 1463 default:
1464 WARN_ON_ONCE(1);
1465 ret = -EINVAL;
1466 goto register_error;
1467 }
1468
19b98250 1469 list_add(&event->priv->node, event_list_head);
7cd0f696 1470 hlist_add_head(&event->priv->hlist_node, head);
99f52fcc 1471
ccefc7ab
MD		 1472 ret = lttng_kernel_event_notifier_clear_error_counter(event);
1473 if (ret)
1474 goto register_error;
dffef45d
FD		 1475 return event_notifier;
1476
1477register_error:
756a020c
MD		 1478 lttng_kernel_event_free(event);
1479alloc_error:
dffef45d
FD		 1480exist:
1481type_error:
1482 return ERR_PTR(ret);
1483}
1484
83006ee0
MD		 1485struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1486 const struct lttng_kernel_event_desc *event_desc)
1487{
1488 switch (event_enabler->enabler_type) {
1489 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1490 {
1491 struct lttng_event_recorder_enabler *event_recorder_enabler =
1492 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1493 struct lttng_kernel_event_recorder *event_recorder;
1494
1495 event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc);
1496 if (!event_recorder)
1497 return NULL;
1498 return &event_recorder->parent;
1499 }
1500 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1501 {
1502 struct lttng_event_notifier_enabler *event_notifier_enabler =
1503 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1504 struct lttng_kernel_event_notifier *event_notifier;
1505
1506 event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc);
1507 if (!event_notifier)
1508 return NULL;
1509 return &event_notifier->parent;
1510 }
1511 default:
1512 return NULL;
1513 }
1514}
1515
1516struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1517 const struct lttng_kernel_event_desc *event_desc)
1518{
1519 struct lttng_kernel_event_common *event;
1520
1521 mutex_lock(&sessions_mutex);
1522 event = _lttng_kernel_event_create(event_enabler, event_desc);
1523 mutex_unlock(&sessions_mutex);
1524 return event;
1525}
1526
1527
1528
99f52fcc
FD		 1529int lttng_kernel_counter_read(struct lttng_counter *counter,
1530 const size_t *dim_indexes, int32_t cpu,
1531 int64_t *val, bool *overflow, bool *underflow)
1532{
1533 return counter->ops->counter_read(counter->counter, dim_indexes,
1534 cpu, val, overflow, underflow);
1535}
1536
1537int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1538 const size_t *dim_indexes, int64_t *val,
1539 bool *overflow, bool *underflow)
1540{
1541 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1542 val, overflow, underflow);
1543}
1544
1545int lttng_kernel_counter_clear(struct lttng_counter *counter,
1546 const size_t *dim_indexes)
1547{
1548 return counter->ops->counter_clear(counter->counter, dim_indexes);
1549}
1550
3c997079
MD		 1551/* Only used for tracepoints for now. */
1552static
0c851fa0 1553void register_event(struct lttng_kernel_event_common *event)
3c997079 1554{
437d5aa5 1555 const struct lttng_kernel_event_desc *desc;
f127e61e 1556 int ret = -EINVAL;
3c997079 1557
0c851fa0 1558 if (event->priv->registered)
3c997079 1559 return;
4ecb5ad5 1560
0c851fa0
MD		 1561 desc = event->priv->desc;
1562 switch (event->priv->instrumentation) {
606828e4 1563 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1564 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1565 desc->tp_class->probe_callback,
0c851fa0 1566 event);
4ecb5ad5 1567 break;
b4a75708 1568
606828e4 1569 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1570 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1571 break;
b4a75708 1572
c190d76e
MJ		 1573 case LTTNG_KERNEL_ABI_KPROBE:
1574 lttng_fallthrough;
1575 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1576 ret = 0;
f0bcc14c 1577 break;
0c851fa0
MD		 1578
1579 case LTTNG_KERNEL_ABI_KRETPROBE:
1580 switch (event->type) {
1581 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1582 ret = 0;
1583 break;
1584 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1585 WARN_ON_ONCE(1);
1586 break;
1587 }
4ecb5ad5 1588 break;
b4a75708 1589
c190d76e
MJ		 1590 case LTTNG_KERNEL_ABI_FUNCTION:
1591 lttng_fallthrough;
1592 case LTTNG_KERNEL_ABI_NOOP:
1593 lttng_fallthrough;
4ecb5ad5
MD		 1594 default:
1595 WARN_ON_ONCE(1);
1596 }
3c997079 1597 if (!ret)
0c851fa0 1598 event->priv->registered = 1;
3c997079
MD		 1599}
1600
f0bcc14c 1601int _lttng_event_unregister(struct lttng_kernel_event_common *event)
4e3c1b9b 1602{
f0bcc14c 1603 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1604 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1605 int ret = -EINVAL;
1606
a67ba386 1607 if (!event_priv->registered)
3c997079
MD		 1608 return 0;
1609
a67ba386
MD		 1610 desc = event_priv->desc;
1611 switch (event_priv->instrumentation) {
606828e4 1612 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1613 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1614 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1615 event);
baf20995 1616 break;
b4a75708 1617
606828e4 1618 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1619 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1620 ret = 0;
1621 break;
b4a75708 1622
606828e4 1623 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1624 switch (event->type) {
1625 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1626 lttng_kretprobes_unregister(event);
1627 ret = 0;
1628 break;
1629 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1630 WARN_ON_ONCE(1);
1631 break;
1632 }
7371f44c 1633 break;
b4a75708 1634
606828e4 1635 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1636 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1637 break;
b4a75708 1638
606828e4 1639 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1640 switch (event->type) {
1641 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1642 ret = 0;
1643 break;
1644 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1645 WARN_ON_ONCE(1);
1646 break;
1647 }
259b6cb3 1648 break;
b4a75708 1649
606828e4 1650 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1651 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1652 ret = 0;
1653 break;
b4a75708 1654
c190d76e
MJ		 1655 case LTTNG_KERNEL_ABI_FUNCTION:
1656 lttng_fallthrough;
baf20995
MD		 1657 default:
1658 WARN_ON_ONCE(1);
1659 }
3c997079 1660 if (!ret)
a67ba386 1661 event_priv->registered = 0;
dda6a249
MD		 1662 return ret;
1663}
1664
1665/*
1666 * Only used internally at session destruction.
1667 */
be066e6c 1668static
0648898e 1669void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1670{
0648898e 1671 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1672 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1673
0648898e
MD		 1674 lttng_free_event_filter_runtime(event);
1675 /* Free event enabler refs */
1676 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1677 &event_priv->enablers_ref_head, node)
1678 kfree(enabler_ref);
b4a75708 1679
0648898e
MD		 1680 switch (event->type) {
1681 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1682 {
1683 struct lttng_kernel_event_recorder *event_recorder =
1684 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1685
0648898e
MD		 1686 switch (event_priv->instrumentation) {
1687 case LTTNG_KERNEL_ABI_TRACEPOINT:
1688 lttng_event_desc_put(event_priv->desc);
1689 break;
b4a75708 1690
0648898e
MD		 1691 case LTTNG_KERNEL_ABI_KPROBE:
1692 module_put(event_priv->desc->owner);
6a35e5bd 1693 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1694 break;
b4a75708 1695
0648898e
MD		 1696 case LTTNG_KERNEL_ABI_KRETPROBE:
1697 module_put(event_priv->desc->owner);
eb6b47db 1698 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1699 break;
b4a75708 1700
0648898e
MD		 1701 case LTTNG_KERNEL_ABI_SYSCALL:
1702 break;
4e3c1b9b 1703
0648898e
MD		 1704 case LTTNG_KERNEL_ABI_UPROBE:
1705 module_put(event_priv->desc->owner);
17806c46 1706 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1707 break;
3ef5cc03 1708
c190d76e
MJ		 1709 case LTTNG_KERNEL_ABI_FUNCTION:
1710 lttng_fallthrough;
1711 case LTTNG_KERNEL_ABI_NOOP:
1712 lttng_fallthrough;
0648898e
MD		 1713 default:
1714 WARN_ON_ONCE(1);
1715 }
f237aef8 1716 list_del(&event_recorder->priv->parent.node);
0648898e
MD		 1717 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1718 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1719 break;
0648898e
MD		 1720 }
1721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1722 {
1723 struct lttng_kernel_event_notifier *event_notifier =
1724 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1725
0648898e
MD		 1726 switch (event_notifier->priv->parent.instrumentation) {
1727 case LTTNG_KERNEL_ABI_TRACEPOINT:
1728 lttng_event_desc_put(event_notifier->priv->parent.desc);
1729 break;
b4a75708 1730
0648898e
MD		 1731 case LTTNG_KERNEL_ABI_KPROBE:
1732 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1733 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1734 break;
b4a75708 1735
0648898e
MD		 1736 case LTTNG_KERNEL_ABI_SYSCALL:
1737 break;
b4a75708 1738
0648898e
MD		 1739 case LTTNG_KERNEL_ABI_UPROBE:
1740 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1741 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1742 break;
1743
c190d76e
MJ		 1744 case LTTNG_KERNEL_ABI_KRETPROBE:
1745 lttng_fallthrough;
1746 case LTTNG_KERNEL_ABI_FUNCTION:
1747 lttng_fallthrough;
1748 case LTTNG_KERNEL_ABI_NOOP:
1749 lttng_fallthrough;
0648898e
MD		 1750 default:
1751 WARN_ON_ONCE(1);
1752 }
f237aef8 1753 list_del(&event_notifier->priv->parent.node);
0648898e
MD		 1754 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1755 kmem_cache_free(event_notifier_cache, event_notifier);
1756 break;
1757 }
dffef45d
FD		 1758 default:
1759 WARN_ON_ONCE(1);
1760 }
dffef45d
FD		 1761}
1762
8c0393c3 1763struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1764 enum tracker_type tracker_type)
e0130fab 1765{
d1f652f8
MD		 1766 switch (tracker_type) {
1767 case TRACKER_PID:
1768 return &session->pid_tracker;
1769 case TRACKER_VPID:
1770 return &session->vpid_tracker;
1771 case TRACKER_UID:
1772 return &session->uid_tracker;
1773 case TRACKER_VUID:
1774 return &session->vuid_tracker;
1775 case TRACKER_GID:
1776 return &session->gid_tracker;
1777 case TRACKER_VGID:
1778 return &session->vgid_tracker;
1779 default:
1780 WARN_ON_ONCE(1);
1781 return NULL;
1782 }
1783}
1784
8cdc1a81 1785int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1786 enum tracker_type tracker_type, int id)
1787{
8c0393c3 1788 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1789 int ret;
1790
d1f652f8
MD		 1791 tracker = get_tracker(session, tracker_type);
1792 if (!tracker)
1793 return -EINVAL;
1794 if (id < -1)
e0130fab
MD		 1795 return -EINVAL;
1796 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1797 if (id == -1) {
1798 /* track all ids: destroy tracker. */
1799 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1800 ret = 0;
1801 } else {
d1f652f8 1802 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1803 }
e0130fab
MD		 1804 mutex_unlock(&sessions_mutex);
1805 return ret;
1806}
1807
8cdc1a81 1808int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1809 enum tracker_type tracker_type, int id)
e0130fab 1810{
8c0393c3 1811 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1812 int ret;
1813
d1f652f8
MD		 1814 tracker = get_tracker(session, tracker_type);
1815 if (!tracker)
1816 return -EINVAL;
1817 if (id < -1)
e0130fab
MD		 1818 return -EINVAL;
1819 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1820 if (id == -1) {
1821 /* untrack all ids: replace by empty tracker. */
1822 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1823 } else {
d1f652f8 1824 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1825 }
e0130fab
MD		 1826 mutex_unlock(&sessions_mutex);
1827 return ret;
1828}
1829
7e6f9ef6 1830static
d1f652f8 1831void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1832{
8c0393c3
MD		 1833 struct lttng_kernel_id_tracker *id_tracker = m->private;
1834 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1835 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1836 int iter = 0, i;
1837
1838 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1839 if (id_tracker_p) {
1840 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1841 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1842
f934e302 1843 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1844 if (iter++ >= *pos)
1845 return e;
1846 }
1847 }
1848 } else {
d1f652f8 1849 /* ID tracker disabled. */
7e6f9ef6 1850 if (iter >= *pos && iter == 0) {
d1f652f8 1851 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1852 }
1853 iter++;
1854 }
1855 /* End of list */
1856 return NULL;
1857}
1858
1859/* Called with sessions_mutex held. */
1860static
d1f652f8 1861void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1862{
8c0393c3
MD		 1863 struct lttng_kernel_id_tracker *id_tracker = m->private;
1864 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1865 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1866 int iter = 0, i;
1867
1868 (*ppos)++;
d1f652f8
MD		 1869 if (id_tracker_p) {
1870 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1871 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1872
f934e302 1873 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1874 if (iter++ >= *ppos)
1875 return e;
1876 }
1877 }
1878 } else {
d1f652f8 1879 /* ID tracker disabled. */
7e6f9ef6 1880 if (iter >= *ppos && iter == 0)
d1f652f8 1881 return p; /* empty tracker */
7e6f9ef6
MD		 1882 iter++;
1883 }
1884
1885 /* End of list */
1886 return NULL;
1887}
1888
1889static
d1f652f8 1890void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1891{
1892 mutex_unlock(&sessions_mutex);
1893}
1894
1895static
d1f652f8 1896int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1897{
8c0393c3
MD		 1898 struct lttng_kernel_id_tracker *id_tracker = m->private;
1899 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1900 int id;
7e6f9ef6 1901
d1f652f8 1902 if (p == id_tracker_p) {
7e6f9ef6 1903 /* Tracker disabled. */
d1f652f8 1904 id = -1;
7e6f9ef6 1905 } else {
d1f652f8 1906 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1907
d1f652f8
MD		 1908 id = lttng_id_tracker_get_node_id(e);
1909 }
8c0393c3 1910 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1911 case TRACKER_PID:
1912 seq_printf(m, "process { pid = %d; };\n", id);
1913 break;
1914 case TRACKER_VPID:
1915 seq_printf(m, "process { vpid = %d; };\n", id);
1916 break;
1917 case TRACKER_UID:
1918 seq_printf(m, "user { uid = %d; };\n", id);
1919 break;
1920 case TRACKER_VUID:
1921 seq_printf(m, "user { vuid = %d; };\n", id);
1922 break;
1923 case TRACKER_GID:
1924 seq_printf(m, "group { gid = %d; };\n", id);
1925 break;
1926 case TRACKER_VGID:
1927 seq_printf(m, "group { vgid = %d; };\n", id);
1928 break;
1929 default:
1930 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1931 }
7e6f9ef6
MD		 1932 return 0;
1933}
1934
1935static
d1f652f8
MD		 1936const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1937 .start = id_list_start,
1938 .next = id_list_next,
1939 .stop = id_list_stop,
1940 .show = id_list_show,
7e6f9ef6
MD		 1941};
1942
1943static
d1f652f8 1944int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1945{
d1f652f8 1946 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1947}
1948
1949static
d1f652f8 1950int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1951{
1952 struct seq_file *m = file->private_data;
8c0393c3 1953 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1954 int ret;
1955
d1f652f8 1956 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1957 ret = seq_release(inode, file);
d1f652f8 1958 if (!ret)
8c0393c3 1959 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1960 return ret;
1961}
1962
d1f652f8 1963const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1964 .owner = THIS_MODULE,
d1f652f8 1965 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1966 .read = seq_read,
1967 .llseek = seq_lseek,
d1f652f8 1968 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1969};
1970
8cdc1a81 1971int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1972 enum tracker_type tracker_type)
7e6f9ef6 1973{
d1f652f8 1974 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1975 struct seq_file *m;
1976 int file_fd, ret;
1977
1978 file_fd = lttng_get_unused_fd();
1979 if (file_fd < 0) {
1980 ret = file_fd;
1981 goto fd_error;
1982 }
1983
d1f652f8
MD		 1984 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1985 &lttng_tracker_ids_list_fops,
7e6f9ef6 1986 NULL, O_RDWR);
d1f652f8
MD		 1987 if (IS_ERR(tracker_ids_list_file)) {
1988 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1989 goto file_error;
1990 }
8cdc1a81 1991 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1992 ret = -EOVERFLOW;
9c1f4643
MD		 1993 goto refcount_error;
1994 }
d1f652f8 1995 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1996 if (ret < 0)
1997 goto open_error;
d1f652f8
MD		 1998 m = tracker_ids_list_file->private_data;
1999
2000 m->private = get_tracker(session, tracker_type);
2001 BUG_ON(!m->private);
2002 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 2003
2004 return file_fd;
2005
2006open_error:
8cdc1a81 2007 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 2008refcount_error:
d1f652f8 2009 fput(tracker_ids_list_file);
7e6f9ef6
MD		 2010file_error:
2011 put_unused_fd(file_fd);
2012fd_error:
2013 return ret;
2014}
2015
3c997079
MD		 2016/*
2017 * Enabler management.
2018 */
2019static
4993071a
PP		 2020int lttng_match_enabler_star_glob(const char *desc_name,
2021 const char *pattern)
3c997079 2022{
cbc19040
MD		 2023 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
2024 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 2025 return 0;
2026 return 1;
2027}
2028
2029static
4ecb5ad5
MD		 2030int lttng_match_enabler_name(const char *desc_name,
2031 const char *name)
3c997079 2032{
4ecb5ad5 2033 if (strcmp(desc_name, name))
3c997079
MD		 2034 return 0;
2035 return 1;
2036}
2037
8bff0fc3
MD		 2038static
2039int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
8d554755 2040 struct lttng_event_enabler_common *enabler)
3c997079 2041{
4ecb5ad5 2042 const char *desc_name, *enabler_name;
badfe9f5 2043 bool compat = false, entry = false;
4ecb5ad5
MD		 2044
2045 enabler_name = enabler->event_param.name;
2046 switch (enabler->event_param.instrumentation) {
606828e4 2047 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 2048 desc_name = desc->event_name;
3b861b22
FD		 2049 switch (enabler->format_type) {
2050 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2051 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2052 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2053 return lttng_match_enabler_name(desc_name, enabler_name);
2054 default:
2055 return -EINVAL;
2056 }
4ecb5ad5 2057 break;
b4a75708 2058
606828e4 2059 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 2060 desc_name = desc->event_name;
badfe9f5 2061 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 2062 desc_name += strlen("compat_");
badfe9f5
MD		 2063 compat = true;
2064 }
4ecb5ad5
MD		 2065 if (!strncmp(desc_name, "syscall_exit_",
2066 strlen("syscall_exit_"))) {
2067 desc_name += strlen("syscall_exit_");
2068 } else if (!strncmp(desc_name, "syscall_entry_",
2069 strlen("syscall_entry_"))) {
2070 desc_name += strlen("syscall_entry_");
badfe9f5 2071 entry = true;
4ecb5ad5
MD		 2072 } else {
2073 WARN_ON_ONCE(1);
2074 return -EINVAL;
2075 }
badfe9f5 2076 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 2077 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 2078 break;
606828e4 2079 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 2080 if (!entry)
2081 return 0;
2082 break;
606828e4 2083 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 2084 if (entry)
2085 return 0;
2086 break;
2087 default:
2088 return -EINVAL;
2089 }
2090 switch (enabler->event_param.u.syscall.abi) {
606828e4 2091 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2092 break;
606828e4 2093 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2094 if (compat)
2095 return 0;
2096 break;
606828e4 2097 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2098 if (!compat)
2099 return 0;
2100 break;
2101 default:
2102 return -EINVAL;
2103 }
2104 switch (enabler->event_param.u.syscall.match) {
606828e4 2105 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2106 switch (enabler->format_type) {
2107 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2108 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2109 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2110 return lttng_match_enabler_name(desc_name, enabler_name);
2111 default:
2112 return -EINVAL;
2113 }
2114 break;
606828e4 2115 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2116 return -EINVAL; /* Not implemented. */
2117 default:
2118 return -EINVAL;
2119 }
4ecb5ad5 2120 break;
b4a75708 2121
4ecb5ad5
MD		 2122 default:
2123 WARN_ON_ONCE(1);
2124 return -EINVAL;
2125 }
3c997079
MD		 2126}
2127
8bff0fc3
MD		 2128bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
2129 struct lttng_event_enabler_common *enabler)
2130{
2131 int ret;
2132
2133 ret = lttng_desc_match_enabler_check(desc, enabler);
2134 if (ret < 0) {
2135 WARN_ON_ONCE(1);
2136 return false;
2137 }
2138 return ret;
2139}
2140
5c6ec66a
MD		 2141bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
2142 struct lttng_kernel_event_common *event)
3c997079 2143{
5c6ec66a
MD		 2144 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2145 return false;
b2bc0bc8 2146
5c6ec66a
MD		 2147 switch (event_enabler->enabler_type) {
2148 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2149 {
2150 struct lttng_event_recorder_enabler *event_recorder_enabler =
2151 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2152 struct lttng_kernel_event_recorder *event_recorder =
2153 container_of(event, struct lttng_kernel_event_recorder, parent);
2154
2155 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2156 && event_recorder->chan == event_recorder_enabler->chan)
2157 return true;
2158 else
2159 return false;
2160 }
2161 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2162 {
2163 struct lttng_event_notifier_enabler *event_notifier_enabler =
2164 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2165 struct lttng_kernel_event_notifier *event_notifier =
2166 container_of(event, struct lttng_kernel_event_notifier, parent);
2167
2168 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2169 && event_notifier->priv->group == event_notifier_enabler->group
2170 && event->priv->user_token == event_enabler->user_token)
2171 return true;
2172 else
2173 return false;
2174 }
2175 default:
2176 WARN_ON_ONCE(1);
2177 return false;
2178 }
3c997079
MD		 2179}
2180
5c6ec66a
MD		 2181bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
2182 const struct lttng_kernel_event_desc *desc,
2183 struct lttng_kernel_event_common *event)
b01155ba 2184{
5c6ec66a
MD		 2185 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2186 return false;
b01155ba 2187
5c6ec66a
MD		 2188 switch (event_enabler->enabler_type) {
2189 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2190 {
2191 struct lttng_event_recorder_enabler *event_recorder_enabler =
2192 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2193 struct lttng_kernel_event_recorder *event_recorder =
2194 container_of(event, struct lttng_kernel_event_recorder, parent);
2195
2196 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
2197 return true;
2198 else
2199 return false;
2200 }
2201 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2202 {
2203 struct lttng_event_notifier_enabler *event_notifier_enabler =
2204 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2205 struct lttng_kernel_event_notifier *event_notifier =
2206 container_of(event, struct lttng_kernel_event_notifier, parent);
2207
2208 if (event->priv->desc == desc
2209 && event_notifier->priv->group == event_notifier_enabler->group
2210 && event->priv->user_token == event_enabler->user_token)
2211 return true;
2212 else
2213 return false;
2214 }
2215 default:
2216 WARN_ON_ONCE(1);
2217 return false;
2218 }
b01155ba
FD		 2219}
2220
0d223dc6
MD		 2221bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler,
2222 const char *event_name,
2223 struct lttng_kernel_event_common *event)
2224{
2225 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2226 return false;
2227
2228 switch (event_enabler->enabler_type) {
2229 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2230 {
2231 struct lttng_event_recorder_enabler *event_recorder_enabler =
2232 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2233 struct lttng_kernel_event_recorder *event_recorder =
2234 container_of(event, struct lttng_kernel_event_recorder, parent);
2235
2236 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2237 && event_recorder->chan == event_recorder_enabler->chan)
2238 return true;
2239 else
2240 return false;
2241 }
2242 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2243 {
2244 struct lttng_event_notifier_enabler *event_notifier_enabler =
2245 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2246 struct lttng_kernel_event_notifier *event_notifier =
2247 container_of(event, struct lttng_kernel_event_notifier, parent);
2248
2249 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2250 && event_notifier->priv->group == event_notifier_enabler->group
2251 && event->priv->user_token == event_enabler->user_token)
2252 return true;
2253 else
2254 return false;
2255 }
2256 default:
2257 WARN_ON_ONCE(1);
2258 return false;
2259 }
2260}
2261
3c997079 2262static
b2bc0bc8
FD		 2263struct lttng_enabler_ref *lttng_enabler_ref(
2264 struct list_head *enablers_ref_list,
8d554755 2265 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2266{
2267 struct lttng_enabler_ref *enabler_ref;
2268
b2bc0bc8 2269 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2270 if (enabler_ref->ref == enabler)
2271 return enabler_ref;
2272 }
2273 return NULL;
2274}
2275
3c997079 2276static
c8e14380 2277void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common *event_enabler)
3c997079 2278{
c8e14380 2279 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
437d5aa5
MD		 2280 struct lttng_kernel_probe_desc *probe_desc;
2281 const struct lttng_kernel_event_desc *desc;
3c997079 2282 struct list_head *probe_list;
c8e14380 2283 int i;
3c997079
MD		 2284
2285 probe_list = lttng_get_probe_list_head();
2286 /*
2287 * For each probe event, if we find that a probe event matches
2288 * our enabler, create an associated lttng_event if not
2289 * already present.
2290 */
2291 list_for_each_entry(probe_desc, probe_list, head) {
2292 for (i = 0; i < probe_desc->nr_events; i++) {
2293 int found = 0;
2294 struct hlist_head *head;
83006ee0 2295 struct lttng_kernel_event_common *event;
19bef247 2296 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2297
2298 desc = probe_desc->event_desc[i];
c8e14380 2299 if (!lttng_desc_match_enabler(desc, event_enabler))
3c997079 2300 continue;
3c997079
MD		 2301
2302 /*
2303 * Check if already created.
2304 */
0def9170 2305 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2306 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
c8e14380 2307 if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub))
3c997079
MD		 2308 found = 1;
2309 }
2310 if (found)
2311 continue;
2312
2313 /*
83006ee0 2314 * We need to create an event for this event probe.
3c997079 2315 */
c8e14380 2316 event = _lttng_kernel_event_create(event_enabler, desc);
83006ee0 2317 if (!event) {
5a15f70c 2318 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2319 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2320 }
2321 }
2322 }
2323}
2324
33a39a3c 2325static
053554ae 2326void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c
MD		 2327{
2328 int ret;
2329
053554ae 2330 ret = lttng_syscalls_register_event(event_enabler);
8a8ac9a8 2331 WARN_ON_ONCE(ret);
8a8ac9a8
FD		 2332}
2333
33a39a3c 2334/*
8839618b 2335 * Create event if it is missing and present in the list of tracepoint probes.
33a39a3c
MD		 2336 * Should be called with sessions mutex held.
2337 */
2338static
8839618b 2339void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c 2340{
8839618b 2341 switch (event_enabler->event_param.instrumentation) {
606828e4 2342 case LTTNG_KERNEL_ABI_TRACEPOINT:
8839618b 2343 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2344 break;
b4a75708 2345
606828e4 2346 case LTTNG_KERNEL_ABI_SYSCALL:
8839618b 2347 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2348 break;
b4a75708 2349
33a39a3c
MD		 2350 default:
2351 WARN_ON_ONCE(1);
2352 break;
2353 }
2354}
2355
d619fae9
MD		 2356static
2357void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
2358 struct lttng_kernel_event_common *event)
2359{
2360 /* Link filter bytecodes if not linked yet. */
2361 lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx,
2362 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
2363}
2364
1e06b222
MD		 2365static
2366void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
2367 struct lttng_kernel_event_common *event)
2368{
2369 switch (event_enabler->enabler_type) {
2370 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2371 break;
2372 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2373 {
2374 struct lttng_event_notifier_enabler *event_notifier_enabler =
2375 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2376 struct lttng_kernel_event_notifier *event_notifier =
2377 container_of(event, struct lttng_kernel_event_notifier, parent);
2378
2379 /* Link capture bytecodes if not linked yet. */
2380 lttng_enabler_link_bytecode(event->priv->desc,
2381 lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head,
2382 &event_notifier_enabler->capture_bytecode_head);
2383 event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
2384 break;
2385 }
2386 default:
2387 WARN_ON_ONCE(1);
2388 }
2389}
2390
3c997079 2391/*
b2bc0bc8 2392 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2393 * and add backward reference from the event to the enabler.
2394 * Should be called with sessions mutex held.
2395 */
2396static
3622cd47 2397int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler)
3c997079 2398{
3622cd47
MD		 2399 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
2400 struct lttng_kernel_event_common_private *event_priv;
3c997079 2401
3622cd47 2402 lttng_syscall_table_set_wildcard_all(event_enabler);
badfe9f5 2403
3c997079 2404 /* First ensure that probe events are created for this enabler. */
3622cd47 2405 lttng_create_event_if_missing(event_enabler);
3c997079 2406
3622cd47
MD		 2407 /* Link the created event with its associated enabler. */
2408 list_for_each_entry(event_priv, event_list_head, node) {
2409 struct lttng_kernel_event_common *event = event_priv->pub;
b01155ba
FD		 2410 struct lttng_enabler_ref *enabler_ref;
2411
3622cd47 2412 if (!lttng_event_enabler_match_event(event_enabler, event))
b01155ba
FD		 2413 continue;
2414
3622cd47 2415 enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler);
b01155ba
FD		 2416 if (!enabler_ref) {
2417 /*
2418 * If no backward ref, create it.
2419 * Add backward ref from event_notifier to enabler.
2420 */
2421 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2422 if (!enabler_ref)
2423 return -ENOMEM;
2424
3622cd47
MD		 2425 enabler_ref->ref = event_enabler;
2426 list_add(&enabler_ref->node, &event_priv->enablers_ref_head);
b01155ba
FD		 2427 }
2428
3622cd47
MD		 2429 lttng_event_enabler_init_event_filter(event_enabler, event);
2430 lttng_event_enabler_init_event_capture(event_enabler, event);
b01155ba
FD		 2431 }
2432 return 0;
2433}
2434
3c997079
MD		 2435/*
2436 * Called at module load: connect the probe on all enablers matching
2437 * this event.
2438 * Called with sessions lock held.
2439 */
2440int lttng_fix_pending_events(void)
2441{
8cdc1a81 2442 struct lttng_kernel_session_private *session_priv;
3c997079 2443
8cdc1a81
MD		 2444 list_for_each_entry(session_priv, &sessions, list)
2445 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2446 return 0;
2447}
2448
b01155ba
FD		 2449static bool lttng_event_notifier_group_has_active_event_notifiers(
2450 struct lttng_event_notifier_group *event_notifier_group)
2451{
09710b83 2452 struct lttng_event_enabler_common *event_enabler;
b01155ba 2453
09710b83
MD		 2454 list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) {
2455 if (event_enabler->enabled)
b01155ba
FD		 2456 return true;
2457 }
2458 return false;
2459}
2460
2461bool lttng_event_notifier_active(void)
2462{
2463 struct lttng_event_notifier_group *event_notifier_group;
2464
2465 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2466 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2467 return true;
2468 }
2469 return false;
2470}
2471
2472int lttng_fix_pending_event_notifiers(void)
2473{
2474 struct lttng_event_notifier_group *event_notifier_group;
2475
2476 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2477 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2478 return 0;
2479}
2480
1ae083ba 2481struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2482 enum lttng_enabler_format_type format_type,
606828e4 2483 struct lttng_kernel_abi_event *event_param,
f7d06400 2484 struct lttng_kernel_channel_buffer *chan)
3c997079 2485{
1ae083ba 2486 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2487
b2bc0bc8
FD		 2488 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2489 if (!event_enabler)
3c997079 2490 return NULL;
0bb716a8 2491 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2492 event_enabler->parent.format_type = format_type;
2493 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2494 memcpy(&event_enabler->parent.event_param, event_param,
2495 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2496 event_enabler->chan = chan;
3c997079 2497 /* ctx left NULL */
5b9817ae 2498 event_enabler->parent.enabled = 0;
def1e304
MD		 2499 return event_enabler;
2500}
2501
2502void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2503 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2504{
3c997079 2505 mutex_lock(&sessions_mutex);
09710b83
MD		 2506 list_add(&event_enabler->parent.node, &session->priv->enablers_head);
2507 event_enabler->parent.published = true;
def1e304 2508 lttng_session_lazy_sync_event_enablers(session);
3c997079 2509 mutex_unlock(&sessions_mutex);
3c997079
MD		 2510}
2511
7b25ab0e 2512int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2513{
2514 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2515 event_enabler->enabled = 1;
2516 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2517 mutex_unlock(&sessions_mutex);
2518 return 0;
2519}
2520
7b25ab0e 2521int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2522{
2523 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2524 event_enabler->enabled = 0;
2525 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2526 mutex_unlock(&sessions_mutex);
2527 return 0;
2528}
2529
b2bc0bc8 2530static
8d554755 2531int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2532 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2533{
d64ca521 2534 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2535 uint32_t bytecode_len;
2536 int ret;
2537
2538 ret = get_user(bytecode_len, &bytecode->len);
2539 if (ret)
2540 return ret;
52cfcdf3 2541 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2542 GFP_KERNEL);
2543 if (!bytecode_node)
2544 return -ENOMEM;
2545 ret = copy_from_user(&bytecode_node->bc, bytecode,
2546 sizeof(*bytecode) + bytecode_len);
2547 if (ret)
2548 goto error_free;
b2bc0bc8 2549
8a445457 2550 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2551 bytecode_node->enabler = enabler;
2552 /* Enforce length based on allocated size */
2553 bytecode_node->bc.len = bytecode_len;
2554 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2555
07dfc1d0
MD		 2556 return 0;
2557
2558error_free:
52cfcdf3 2559 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2560 return ret;
2561}
2562
6048044f 2563int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2564 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2565{
2566 int ret;
6048044f 2567 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2568 if (ret)
2569 goto error;
7b25ab0e 2570 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2571 return 0;
2572
2573error:
2574 return ret;
2575}
2576
e2d5dbc7 2577int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2578 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2579{
2580
e2d5dbc7 2581 switch (event->priv->instrumentation) {
606828e4 2582 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2583 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2584 default:
2585 return -EINVAL;
2586 }
2587}
2588
3c997079 2589static
8d554755 2590void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2591{
d64ca521 2592 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2593
2594 /* Destroy filter bytecode */
2595 list_for_each_entry_safe(filter_node, tmp_filter_node,
2596 &enabler->filter_bytecode_head, node) {
52cfcdf3 2597 lttng_kvfree(filter_node);
07dfc1d0 2598 }
b2bc0bc8
FD		 2599}
2600
44b1abdc 2601void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2602{
09710b83
MD		 2603 lttng_enabler_destroy(event_enabler);
2604 if (event_enabler->published)
2605 list_del(&event_enabler->node);
2606
44b1abdc
MD		 2607 switch (event_enabler->enabler_type) {
2608 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2609 {
2610 struct lttng_event_recorder_enabler *event_recorder_enabler =
2611 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2612
44b1abdc
MD		 2613 kfree(event_recorder_enabler);
2614 break;
2615 }
2616 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2617 {
2618 struct lttng_event_notifier_enabler *event_notifier_enabler =
2619 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2620
44b1abdc
MD		 2621 kfree(event_notifier_enabler);
2622 break;
2623 }
2624 default:
2625 WARN_ON_ONCE(1);
2626 }
3c997079
MD		 2627}
2628
dffef45d 2629struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2630 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2631 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2632 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2633{
2634 struct lttng_event_notifier_enabler *event_notifier_enabler;
2635
2636 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2637 if (!event_notifier_enabler)
2638 return NULL;
2639
0bb716a8 2640 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2641 event_notifier_enabler->parent.format_type = format_type;
2642 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2643 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2644
99f52fcc 2645 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2646 event_notifier_enabler->num_captures = 0;
dffef45d 2647
5b9817ae
MD		 2648 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2649 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2650
5b9817ae
MD		 2651 event_notifier_enabler->parent.enabled = 0;
2652 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2653 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2654 return event_notifier_enabler;
2655}
dffef45d 2656
1bbb5b2d
MD		 2657void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2658 struct lttng_event_notifier_enabler *event_notifier_enabler)
2659{
dffef45d 2660 mutex_lock(&sessions_mutex);
09710b83
MD		 2661 list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head);
2662 event_notifier_enabler->parent.published = true;
b01155ba 2663 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2664 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2665}
2666
2667int lttng_event_notifier_enabler_enable(
2668 struct lttng_event_notifier_enabler *event_notifier_enabler)
2669{
2670 mutex_lock(&sessions_mutex);
2671 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2672 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2673 mutex_unlock(&sessions_mutex);
2674 return 0;
2675}
2676
2677int lttng_event_notifier_enabler_disable(
2678 struct lttng_event_notifier_enabler *event_notifier_enabler)
2679{
2680 mutex_lock(&sessions_mutex);
2681 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2682 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2683 mutex_unlock(&sessions_mutex);
2684 return 0;
2685}
2686
99d223ad
FD		 2687int lttng_event_notifier_enabler_attach_capture_bytecode(
2688 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2689 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2690{
d64ca521 2691 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2692 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2693 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2694 uint32_t bytecode_len;
2695 int ret;
2696
2697 ret = get_user(bytecode_len, &bytecode->len);
2698 if (ret)
2699 return ret;
2700
2701 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2702 GFP_KERNEL);
2703 if (!bytecode_node)
2704 return -ENOMEM;
2705
2706 ret = copy_from_user(&bytecode_node->bc, bytecode,
2707 sizeof(*bytecode) + bytecode_len);
2708 if (ret)
2709 goto error_free;
2710
8a445457 2711 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2712 bytecode_node->enabler = enabler;
2713
2714 /* Enforce length based on allocated size */
2715 bytecode_node->bc.len = bytecode_len;
2716 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2717
2718 event_notifier_enabler->num_captures++;
2719
2720 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2721 goto end;
2722
2723error_free:
2724 lttng_kvfree(bytecode_node);
2725end:
2726 return ret;
2727}
2728
cc5719b1
MD		 2729static
2730void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event)
2731{
2732 int has_enablers_without_filter_bytecode = 0, nr_filters = 0;
2733 struct lttng_kernel_bytecode_runtime *runtime;
2734 struct lttng_enabler_ref *enabler_ref;
2735
2736 /* Check if has enablers without bytecode enabled */
2737 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2738 if (enabler_ref->ref->enabled
2739 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2740 has_enablers_without_filter_bytecode = 1;
2741 break;
2742 }
2743 }
2744 event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode;
2745
2746 /* Enable filters */
2747 list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) {
2748 lttng_bytecode_sync_state(runtime);
2749 nr_filters++;
2750 }
2751 WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters));
2752}
2753
2754static
2755void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event)
2756{
2757 switch (event->type) {
2758 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2759 break;
2760 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2761 {
2762 struct lttng_kernel_event_notifier *event_notifier =
2763 container_of(event, struct lttng_kernel_event_notifier, parent);
2764 struct lttng_kernel_bytecode_runtime *runtime;
2765 int nr_captures = 0;
2766
2767 /* Enable captures */
2768 list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) {
2769 lttng_bytecode_sync_state(runtime);
2770 nr_captures++;
2771 }
2772 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2773 break;
2774 }
2775 default:
2776 WARN_ON_ONCE(1);
2777 }
2778}
2779
a0c6ad2e
MD		 2780static
2781bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event)
2782{
2783 struct lttng_enabler_ref *enabler_ref;
2784 bool enabled = false;
2785
2786 switch (event->priv->instrumentation) {
2787 case LTTNG_KERNEL_ABI_TRACEPOINT:
2788 lttng_fallthrough;
2789 case LTTNG_KERNEL_ABI_SYSCALL:
2790 /* Enable events */
2791 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2792 if (enabler_ref->ref->enabled) {
2793 enabled = true;
2794 break;
2795 }
2796 }
2797 break;
2798 default:
2799 WARN_ON_ONCE(1);
2800 return false;
2801 }
2802
2803 switch (event->type) {
2804 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2805 {
2806 struct lttng_kernel_event_recorder *event_recorder =
2807 container_of(event, struct lttng_kernel_event_recorder, parent);
2808
2809 /*
2810 * Enabled state is based on union of enablers, with
2811 * intersection of session and channel transient enable
2812 * states.
2813 */
2814 return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2815 }
2816 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2817 return enabled;
2818 default:
2819 WARN_ON_ONCE(1);
2820 return false;
2821 }
2822}
2823
2824static
2825bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event)
2826{
2827 switch (event->priv->instrumentation) {
2828 case LTTNG_KERNEL_ABI_TRACEPOINT:
2829 lttng_fallthrough;
2830 case LTTNG_KERNEL_ABI_SYSCALL:
2831 return true;
2832
2833 default:
2834 /* Not handled with lazy sync. */
2835 return false;
2836 }
2837}
2838
3c997079 2839/*
3c997079
MD		 2840 * Should be called with sessions mutex held.
2841 */
2842static
a0c6ad2e
MD		 2843void lttng_sync_event_list(struct list_head *event_enabler_list,
2844 struct list_head *event_list)
3c997079 2845{
a0c6ad2e 2846 struct lttng_kernel_event_common_private *event_priv;
09710b83 2847 struct lttng_event_enabler_common *event_enabler;
3c997079 2848
a0c6ad2e 2849 list_for_each_entry(event_enabler, event_enabler_list, node)
09710b83 2850 lttng_event_enabler_ref_events(event_enabler);
a0c6ad2e 2851
3c997079
MD		 2852 /*
2853 * For each event, if at least one of its enablers is enabled,
2854 * and its channel and session transient states are enabled, we
2855 * enable the event, else we disable it.
2856 */
a0c6ad2e
MD		 2857 list_for_each_entry(event_priv, event_list, node) {
2858 struct lttng_kernel_event_common *event = event_priv->pub;
2859 bool enabled;
b4a75708 2860
a0c6ad2e 2861 if (!lttng_event_is_lazy_sync(event))
3c997079 2862 continue;
3c997079 2863
a0c6ad2e
MD		 2864 enabled = lttng_get_event_enabled_state(event);
2865 WRITE_ONCE(event->enabled, enabled);
3c997079 2866 /*
a0c6ad2e 2867 * Sync tracepoint registration with event enabled state.
3c997079
MD		 2868 */
2869 if (enabled) {
a0c6ad2e 2870 register_event(event);
3c997079 2871 } else {
a0c6ad2e 2872 _lttng_event_unregister(event);
3c997079 2873 }
07dfc1d0 2874
a0c6ad2e
MD		 2875 lttng_event_sync_filter_state(event);
2876 lttng_event_sync_capture_state(event);
3c997079
MD		 2877 }
2878}
2879
a0c6ad2e
MD		 2880/*
2881 * lttng_session_sync_event_enablers should be called just before starting a
2882 * session.
2883 */
2884static
2885void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2886{
2887 lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events);
2888}
2889
3c997079
MD		 2890/*
2891 * Apply enablers to session events, adding events to session if need
2892 * be. It is required after each modification applied to an active
2893 * session, and right before session "start".
2894 * "lazy" sync means we only sync if required.
2895 * Should be called with sessions mutex held.
2896 */
2897static
8cdc1a81 2898void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2899{
2900 /* We can skip if session is not active */
2901 if (!session->active)
2902 return;
b2bc0bc8 2903 lttng_session_sync_event_enablers(session);
3c997079
MD		 2904}
2905
b01155ba
FD		 2906static
2907void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2908{
a0c6ad2e 2909 lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head);
b01155ba
FD		 2910}
2911
7b25ab0e
MD		 2912static
2913void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2914{
2915 switch (event_enabler->enabler_type) {
2916 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2917 {
2918 struct lttng_event_recorder_enabler *event_recorder_enabler =
2919 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2920 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2921 break;
2922 }
2923 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2924 {
2925 struct lttng_event_notifier_enabler *event_notifier_enabler =
2926 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2927 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2928 break;
2929 }
2930 default:
2931 WARN_ON_ONCE(1);
2932 }
2933}
2934
1ec3f75a 2935/*
d83004aa
JD		 2936 * Serialize at most one packet worth of metadata into a metadata
2937 * channel.
92d9f5e6
MD		 2938 * We grab the metadata cache mutex to get exclusive access to our metadata
2939 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2940 * allows us to do racy operations such as looking for remaining space left in
2941 * packet and write, since mutual exclusion protects us from concurrent writes.
2942 * Mutual exclusion on the metadata cache allow us to read the cache content
2943 * without racing against reallocation of the cache by updates.
35097f36
JD		 2944 * Returns the number of bytes written in the channel, 0 if no data
2945 * was written and a negative value on error.
1ec3f75a 2946 */
b3b8072b 2947int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2948 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2949{
8a57ec02 2950 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2951 int ret = 0;
2952 size_t len, reserve_len;
2953
f613e3e6 2954 /*
92d9f5e6
MD		 2955 * Ensure we support mutiple get_next / put sequences followed by
2956 * put_next. The metadata cache lock protects reading the metadata
2957 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2958 * "flush" operations on the buffer invoked by different processes.
2959 * Moreover, since the metadata cache memory can be reallocated, we
2960 * need to have exclusive access against updates even though we only
2961 * read it.
f613e3e6 2962 */
92d9f5e6 2963 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2964 WARN_ON(stream->metadata_in < stream->metadata_out);
2965 if (stream->metadata_in != stream->metadata_out)
de23d59d 2966 goto end;
f613e3e6 2967
9616f0bf
JD		 2968 /* Metadata regenerated, change the version. */
2969 if (stream->metadata_cache->version != stream->version)
2970 stream->version = stream->metadata_cache->version;
2971
d83004aa 2972 len = stream->metadata_cache->metadata_written -
f613e3e6 2973 stream->metadata_in;
9de2c215 2974 if (!len)
de23d59d 2975 goto end;
d83004aa 2976 reserve_len = min_t(size_t,
4a399b76 2977 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2978 len);
a775608d 2979 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2980 sizeof(char), NULL);
d83004aa
JD		 2981 /*
2982 * If reservation failed, return an error to the caller.
2983 */
c2fb9c1c 2984 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2985 if (ret != 0) {
2986 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2987 stream->coherent = false;
d83004aa
JD		 2988 goto end;
2989 }
b3b8072b 2990 stream->transport->ops.event_write(&ctx,
f613e3e6 2991 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2992 reserve_len, 1);
b3b8072b 2993 stream->transport->ops.event_commit(&ctx);
f613e3e6 2994 stream->metadata_in += reserve_len;
3e75e2a7 2995 if (reserve_len < len)
8b97fd42
MD		 2996 stream->coherent = false;
2997 else
2998 stream->coherent = true;
d83004aa
JD		 2999 ret = reserve_len;
3000
3001end:
8b97fd42
MD		 3002 if (coherent)
3003 *coherent = stream->coherent;
92d9f5e6 3004 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 3005 return ret;
3006}
3007
8b97fd42 3008static
8cdc1a81 3009void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 3010{
8cdc1a81
MD		 3011 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
3012 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 3013}
3014
3015static
8cdc1a81 3016void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 3017{
8cdc1a81
MD		 3018 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3019 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 3020 struct lttng_metadata_stream *stream;
3021
8cdc1a81 3022 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 3023 wake_up_interruptible(&stream->read_wait);
8cdc1a81 3024 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 3025 }
8b97fd42
MD		 3026}
3027
d83004aa
JD		 3028/*
3029 * Write the metadata to the metadata cache.
3030 * Must be called with sessions_mutex held.
92d9f5e6
MD		 3031 * The metadata cache lock protects us from concurrent read access from
3032 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 3033 * The content of the printf is printed as a single atomic metadata
3034 * transaction.
d83004aa 3035 */
8cdc1a81 3036int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 3037 const char *fmt, ...)
3038{
c099397a 3039 char *str;
d83004aa 3040 size_t len;
c099397a
MD		 3041 va_list ap;
3042
585e5dcc 3043 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 3044
3045 va_start(ap, fmt);
3046 str = kvasprintf(GFP_KERNEL, fmt, ap);
3047 va_end(ap);
3048 if (!str)
3049 return -ENOMEM;
3050
1ec3f75a 3051 len = strlen(str);
8cdc1a81
MD		 3052 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3053 if (session->priv->metadata_cache->metadata_written + len >
3054 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 3055 char *tmp_cache_realloc;
3056 unsigned int tmp_cache_alloc_size;
3057
3058 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 3059 session->priv->metadata_cache->cache_alloc + len,
3060 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 3061 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 3062 if (!tmp_cache_realloc)
3063 goto err;
8cdc1a81 3064 if (session->priv->metadata_cache->data) {
a606b6e8 3065 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 3066 session->priv->metadata_cache->data,
3067 session->priv->metadata_cache->cache_alloc);
3068 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 3069 }
3070
8cdc1a81
MD		 3071 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3072 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3073 }
8cdc1a81
MD		 3074 memcpy(session->priv->metadata_cache->data +
3075 session->priv->metadata_cache->metadata_written,
d83004aa 3076 str, len);
8cdc1a81 3077 session->priv->metadata_cache->metadata_written += len;
c099397a 3078 kfree(str);
d83004aa 3079
d83004aa
JD		 3080 return 0;
3081
3082err:
3083 kfree(str);
3084 return -ENOMEM;
c099397a
MD		 3085}
3086
f513b2bf 3087static
8cdc1a81 3088int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3089{
3090 size_t i;
3091
3092 for (i = 0; i < nesting; i++) {
3093 int ret;
3094
3095 ret = lttng_metadata_printf(session, " ");
3096 if (ret) {
3097 return ret;
3098 }
3099 }
3100 return 0;
3101}
3102
ceabb767 3103static
8cdc1a81 3104int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3105 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3106 size_t nesting)
3107{
3108 return lttng_metadata_printf(session, " _%s;\n", field->name);
3109}
3110
3111static
8cdc1a81 3112int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3113 const struct lttng_kernel_type_integer *type,
3114 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3115 size_t nesting)
3116{
3117 int ret;
3118
ceabb767
MD		 3119 ret = print_tabs(session, nesting);
3120 if (ret)
3121 return ret;
3122 ret = lttng_metadata_printf(session,
3123 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3124 type->size,
3125 type->alignment,
3126 type->signedness,
3127 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3128 ? "none"
437d5aa5 3129 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3130 ? "UTF8"
3131 : "ASCII",
437d5aa5 3132 type->base,
ceabb767 3133#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3134 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3135#else
437d5aa5 3136 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3137#endif
3138 );
3139 return ret;
3140}
3141
f513b2bf
MD		 3142/*
3143 * Must be called with sessions_mutex held.
3144 */
3145static
8cdc1a81 3146int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3147 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3148 size_t nesting)
3149{
51ef4536 3150 const char *prev_field_name = NULL;
f513b2bf
MD		 3151 int ret;
3152 uint32_t i, nr_fields;
ceabb767
MD		 3153 unsigned int alignment;
3154
f513b2bf
MD		 3155 ret = print_tabs(session, nesting);
3156 if (ret)
3157 return ret;
3158 ret = lttng_metadata_printf(session,
3159 "struct {\n");
3160 if (ret)
3161 return ret;
437d5aa5 3162 nr_fields = type->nr_fields;
f513b2bf 3163 for (i = 0; i < nr_fields; i++) {
437d5aa5 3164 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3165
437d5aa5 3166 iter_field = type->fields[i];
51ef4536 3167 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3168 if (ret)
3169 return ret;
3170 }
3171 ret = print_tabs(session, nesting);
3172 if (ret)
3173 return ret;
437d5aa5 3174 alignment = type->alignment;
ceabb767
MD		 3175 if (alignment) {
3176 ret = lttng_metadata_printf(session,
3177 "} align(%u)",
3178 alignment);
3179 } else {
3180 ret = lttng_metadata_printf(session,
3181 "}");
3182 }
f513b2bf
MD		 3183 return ret;
3184}
3185
3186/*
3187 * Must be called with sessions_mutex held.
3188 */
3189static
8cdc1a81 3190int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3191 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3192 size_t nesting)
3193{
3194 int ret;
3195
3196 ret = _lttng_struct_type_statedump(session,
437d5aa5 3197 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3198 if (ret)
3199 return ret;
ceabb767 3200 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3201}
3202
65c85aa6
MD		 3203/*
3204 * Must be called with sessions_mutex held.
3205 */
3206static
8cdc1a81 3207int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3208 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3209 size_t nesting,
3210 const char *prev_field_name)
65c85aa6 3211{
51ef4536 3212 const char *tag_name;
65c85aa6
MD		 3213 int ret;
3214 uint32_t i, nr_choices;
3215
51ef4536
MD		 3216 tag_name = type->tag_name;
3217 if (!tag_name)
3218 tag_name = prev_field_name;
3219 if (!tag_name)
3220 return -EINVAL;
ceabb767
MD		 3221 /*
3222 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3223 */
437d5aa5 3224 if (type->alignment != 0)
ceabb767 3225 return -EINVAL;
65c85aa6
MD		 3226 ret = print_tabs(session, nesting);
3227 if (ret)
3228 return ret;
3229 ret = lttng_metadata_printf(session,
3230 "variant <_%s> {\n",
51ef4536 3231 tag_name);
65c85aa6
MD		 3232 if (ret)
3233 return ret;
437d5aa5 3234 nr_choices = type->nr_choices;
65c85aa6 3235 for (i = 0; i < nr_choices; i++) {
437d5aa5 3236 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3237
437d5aa5 3238 iter_field = type->choices[i];
51ef4536 3239 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3240 if (ret)
3241 return ret;
3242 }
3243 ret = print_tabs(session, nesting);
3244 if (ret)
3245 return ret;
3246 ret = lttng_metadata_printf(session,
3247 "}");
3248 return ret;
3249}
3250
3251/*
3252 * Must be called with sessions_mutex held.
3253 */
3254static
8cdc1a81 3255int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3256 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3257 size_t nesting,
3258 const char *prev_field_name)
65c85aa6
MD		 3259{
3260 int ret;
3261
3262 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3263 lttng_kernel_get_type_variant(field->type), nesting,
3264 prev_field_name);
65c85aa6
MD		 3265 if (ret)
3266 return ret;
ceabb767 3267 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3268}
3269
f513b2bf
MD		 3270/*
3271 * Must be called with sessions_mutex held.
3272 */
3273static
8cdc1a81 3274int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3275 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3276 size_t nesting)
3277{
3278 int ret;
437d5aa5
MD		 3279 const struct lttng_kernel_type_array *array_type;
3280 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3281
437d5aa5
MD		 3282 array_type = lttng_kernel_get_type_array(field->type);
3283 WARN_ON_ONCE(!array_type);
ceabb767 3284
437d5aa5 3285 if (array_type->alignment) {
ceabb767 3286 ret = print_tabs(session, nesting);
f513b2bf
MD		 3287 if (ret)
3288 return ret;
ceabb767
MD		 3289 ret = lttng_metadata_printf(session,
3290 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3291 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3292 field->name);
3293 if (ret)
3294 return ret;
3295 }
3296 /*
3297 * Nested compound types: Only array of structures and variants are
3298 * currently supported.
3299 */
437d5aa5 3300 elem_type = array_type->elem_type;
12bb2edb
MD		 3301 switch (elem_type->type) {
3302 case lttng_kernel_type_integer:
437d5aa5
MD		 3303 case lttng_kernel_type_struct:
3304 case lttng_kernel_type_variant:
3305 ret = _lttng_type_statedump(session, elem_type,
3306 array_type->encoding, nesting);
65c85aa6
MD		 3307 if (ret)
3308 return ret;
3309 break;
ceabb767 3310
f513b2bf
MD		 3311 default:
3312 return -EINVAL;
3313 }
3314 ret = lttng_metadata_printf(session,
3315 " _%s[%u];\n",
3316 field->name,
437d5aa5 3317 array_type->length);
f513b2bf
MD		 3318 return ret;
3319}
3320
3321/*
3322 * Must be called with sessions_mutex held.
3323 */
3324static
8cdc1a81 3325int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3326 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3327 size_t nesting,
3328 const char *prev_field_name)
f513b2bf
MD		 3329{
3330 int ret;
3331 const char *length_name;
437d5aa5
MD		 3332 const struct lttng_kernel_type_sequence *sequence_type;
3333 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3334
437d5aa5
MD		 3335 sequence_type = lttng_kernel_get_type_sequence(field->type);
3336 WARN_ON_ONCE(!sequence_type);
f513b2bf 3337
437d5aa5 3338 length_name = sequence_type->length_name;
51ef4536
MD		 3339 if (!length_name)
3340 length_name = prev_field_name;
3341 if (!length_name)
3342 return -EINVAL;
ceabb767 3343
437d5aa5 3344 if (sequence_type->alignment) {
ceabb767 3345 ret = print_tabs(session, nesting);
f513b2bf
MD		 3346 if (ret)
3347 return ret;
ceabb767
MD		 3348 ret = lttng_metadata_printf(session,
3349 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3350 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3351 field->name);
3352 if (ret)
3353 return ret;
3354 }
3355
3356 /*
3357 * Nested compound types: Only array of structures and variants are
3358 * currently supported.
3359 */
437d5aa5 3360 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3361 switch (elem_type->type) {
3362 case lttng_kernel_type_integer:
437d5aa5
MD		 3363 case lttng_kernel_type_struct:
3364 case lttng_kernel_type_variant:
3365 ret = _lttng_type_statedump(session, elem_type,
3366 sequence_type->encoding, nesting);
65c85aa6
MD		 3367 if (ret)
3368 return ret;
3369 break;
ceabb767 3370
f513b2bf
MD		 3371 default:
3372 return -EINVAL;
3373 }
3374 ret = lttng_metadata_printf(session,
3375 " _%s[ _%s ];\n",
3376 field->name,
51ef4536 3377 length_name);
f513b2bf
MD		 3378 return ret;
3379}
3380
141ddf28
MD		 3381/*
3382 * Must be called with sessions_mutex held.
3383 */
3384static
8cdc1a81 3385int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3386 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3387 size_t nesting)
3388{
d96a4a7a 3389 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3390 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3391 int ret;
3392 unsigned int i, nr_entries;
3393
437d5aa5 3394 container_type = type->container_type;
12bb2edb 3395 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3396 ret = -EINVAL;
3397 goto end;
3398 }
437d5aa5 3399 enum_desc = type->desc;
141ddf28
MD		 3400 nr_entries = enum_desc->nr_entries;
3401
3402 ret = print_tabs(session, nesting);
3403 if (ret)
3404 goto end;
ceabb767
MD		 3405 ret = lttng_metadata_printf(session, "enum : ");
3406 if (ret)
3407 goto end;
437d5aa5
MD		 3408 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3409 lttng_kernel_string_encoding_none, 0);
141ddf28 3410 if (ret)
ceabb767
MD		 3411 goto end;
3412 ret = lttng_metadata_printf(session, " {\n");
3413 if (ret)
3414 goto end;
141ddf28
MD		 3415 /* Dump all entries */
3416 for (i = 0; i < nr_entries; i++) {
437d5aa5 3417 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3418 int j, len;
3419
3420 ret = print_tabs(session, nesting + 1);
3421 if (ret)
3422 goto end;
3423 ret = lttng_metadata_printf(session,
3424 "\"");
3425 if (ret)
3426 goto end;
3427 len = strlen(entry->string);
3428 /* Escape the character '"' */
3429 for (j = 0; j < len; j++) {
3430 char c = entry->string[j];
3431
3432 switch (c) {
3433 case '"':
3434 ret = lttng_metadata_printf(session,
3435 "\\\"");
3436 break;
3437 case '\\':
3438 ret = lttng_metadata_printf(session,
3439 "\\\\");
3440 break;
3441 default:
3442 ret = lttng_metadata_printf(session,
3443 "%c", c);
3444 break;
3445 }
3446 if (ret)
3447 goto end;
3448 }
08ad1061
PP		 3449 ret = lttng_metadata_printf(session, "\"");
3450 if (ret)
3451 goto end;
3452
3453 if (entry->options.is_auto) {
3454 ret = lttng_metadata_printf(session, ",\n");
3455 if (ret)
3456 goto end;
141ddf28 3457 } else {
7c559490
MD		 3458 ret = lttng_metadata_printf(session,
3459 " = ");
3460 if (ret)
3461 goto end;
3462 if (entry->start.signedness)
141ddf28 3463 ret = lttng_metadata_printf(session,
7c559490
MD		 3464 "%lld", (long long) entry->start.value);
3465 else
3466 ret = lttng_metadata_printf(session,
3467 "%llu", entry->start.value);
3468 if (ret)
3469 goto end;
3470 if (entry->start.signedness == entry->end.signedness &&
3471 entry->start.value
3472 == entry->end.value) {
141ddf28 3473 ret = lttng_metadata_printf(session,
7c559490
MD		 3474 ",\n");
3475 } else {
3476 if (entry->end.signedness) {
3477 ret = lttng_metadata_printf(session,
3478 " ... %lld,\n",
3479 (long long) entry->end.value);
3480 } else {
3481 ret = lttng_metadata_printf(session,
3482 " ... %llu,\n",
3483 entry->end.value);
3484 }
141ddf28 3485 }
7c559490
MD		 3486 if (ret)
3487 goto end;
141ddf28 3488 }
141ddf28
MD		 3489 }
3490 ret = print_tabs(session, nesting);
3491 if (ret)
3492 goto end;
ceabb767 3493 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3494end:
3495 return ret;
3496}
3497
d83004aa
JD		 3498/*
3499 * Must be called with sessions_mutex held.
3500 */
c099397a 3501static
8cdc1a81 3502int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3503 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3504 size_t nesting)
3505{
3506 int ret;
437d5aa5 3507 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3508
437d5aa5
MD		 3509 enum_type = lttng_kernel_get_type_enum(field->type);
3510 WARN_ON_ONCE(!enum_type);
3511 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3512 if (ret)
3513 return ret;
3514 return lttng_field_name_statedump(session, field, nesting);
3515}
3516
3517static
8cdc1a81 3518int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3519 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3520 size_t nesting)
3521{
3522 int ret;
3523
437d5aa5
MD		 3524 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3525 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3526 if (ret)
3527 return ret;
3528 return lttng_field_name_statedump(session, field, nesting);
3529}
3530
3531static
8cdc1a81 3532int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3533 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3534 size_t nesting)
3535{
3536 int ret;
3537
ceabb767
MD		 3538 /* Default encoding is UTF8 */
3539 ret = print_tabs(session, nesting);
3540 if (ret)
3541 return ret;
3542 ret = lttng_metadata_printf(session,
3543 "string%s",
437d5aa5 3544 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3545 " { encoding = ASCII; }" : "");
3546 return ret;
3547}
3548
3549static
8cdc1a81 3550int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3551 const struct lttng_kernel_event_field *field,
f513b2bf 3552 size_t nesting)
ceabb767 3553{
437d5aa5 3554 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3555 int ret;
3556
437d5aa5
MD		 3557 string_type = lttng_kernel_get_type_string(field->type);
3558 WARN_ON_ONCE(!string_type);
3559 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3560 if (ret)
3561 return ret;
3562 return lttng_field_name_statedump(session, field, nesting);
3563}
3564
3565/*
3566 * Must be called with sessions_mutex held.
3567 */
3568static
8cdc1a81 3569int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3570 const struct lttng_kernel_type_common *type,
3571 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3572 size_t nesting)
c099397a 3573{
c099397a 3574 int ret = 0;
c099397a 3575
12bb2edb
MD		 3576 switch (type->type) {
3577 case lttng_kernel_type_integer:
437d5aa5
MD		 3578 ret = _lttng_integer_type_statedump(session,
3579 lttng_kernel_get_type_integer(type),
3580 parent_encoding, nesting);
8070f5c0 3581 break;
437d5aa5
MD		 3582 case lttng_kernel_type_enum:
3583 ret = _lttng_enum_type_statedump(session,
3584 lttng_kernel_get_type_enum(type),
3585 nesting);
8070f5c0 3586 break;
12bb2edb 3587 case lttng_kernel_type_string:
437d5aa5
MD		 3588 ret = _lttng_string_type_statedump(session,
3589 lttng_kernel_get_type_string(type),
3590 nesting);
ceabb767 3591 break;
437d5aa5
MD		 3592 case lttng_kernel_type_struct:
3593 ret = _lttng_struct_type_statedump(session,
3594 lttng_kernel_get_type_struct(type),
3595 nesting);
8070f5c0 3596 break;
437d5aa5
MD		 3597 case lttng_kernel_type_variant:
3598 ret = _lttng_variant_type_statedump(session,
3599 lttng_kernel_get_type_variant(type),
51ef4536 3600 nesting, NULL);
ceabb767
MD		 3601 break;
3602
3603 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3604 case lttng_kernel_type_array:
3605 case lttng_kernel_type_sequence:
ceabb767
MD		 3606 default:
3607 WARN_ON_ONCE(1);
3608 return -EINVAL;
8070f5c0 3609 }
ceabb767
MD		 3610 return ret;
3611}
8070f5c0 3612
ceabb767
MD		 3613/*
3614 * Must be called with sessions_mutex held.
3615 */
3616static
8cdc1a81 3617int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3618 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3619 size_t nesting,
3620 const char **prev_field_name_p)
ceabb767 3621{
51ef4536 3622 const char *prev_field_name = NULL;
ceabb767 3623 int ret = 0;
27d2368e 3624
51ef4536
MD		 3625 if (prev_field_name_p)
3626 prev_field_name = *prev_field_name_p;
437d5aa5 3627 switch (field->type->type) {
12bb2edb 3628 case lttng_kernel_type_integer:
ceabb767
MD		 3629 ret = _lttng_integer_field_statedump(session, field, nesting);
3630 break;
437d5aa5 3631 case lttng_kernel_type_enum:
ceabb767 3632 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3633 break;
12bb2edb 3634 case lttng_kernel_type_string:
ceabb767 3635 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3636 break;
437d5aa5 3637 case lttng_kernel_type_struct:
ceabb767 3638 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3639 break;
437d5aa5 3640 case lttng_kernel_type_array:
ceabb767 3641 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3642 break;
437d5aa5 3643 case lttng_kernel_type_sequence:
51ef4536 3644 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3645 break;
437d5aa5 3646 case lttng_kernel_type_variant:
51ef4536 3647 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3648 break;
f513b2bf 3649
8070f5c0
MD		 3650 default:
3651 WARN_ON_ONCE(1);
3652 return -EINVAL;
3653 }
51ef4536
MD		 3654 if (prev_field_name_p)
3655 *prev_field_name_p = field->name;
8070f5c0
MD		 3656 return ret;
3657}
3658
3659static
8cdc1a81 3660int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3661 struct lttng_kernel_ctx *ctx)
8070f5c0 3662{
51ef4536 3663 const char *prev_field_name = NULL;
8070f5c0
MD		 3664 int ret = 0;
3665 int i;
3666
3667 if (!ctx)
3668 return 0;
3669 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3670 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3671
51ef4536 3672 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3673 if (ret)
3674 return ret;
3675 }
3676 return ret;
3677}
3678
3679static
8cdc1a81 3680int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3681 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3682{
51ef4536 3683 const char *prev_field_name = NULL;
a67ba386 3684 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3685 int ret = 0;
3686 int i;
3687
6c8c025b
MD		 3688 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3689 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3690
51ef4536 3691 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3692 if (ret)
3693 return ret;
c099397a
MD		 3694 }
3695 return ret;
3696}
3697
d83004aa
JD		 3698/*
3699 * Must be called with sessions_mutex held.
8b97fd42
MD		 3700 * The entire event metadata is printed as a single atomic metadata
3701 * transaction.
d83004aa 3702 */
c099397a 3703static
ee7e9a18 3704int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event)
c099397a 3705{
ee7e9a18
MD		 3706 struct lttng_kernel_event_recorder *event_recorder;
3707 struct lttng_kernel_channel_buffer *chan;
3708 struct lttng_kernel_session *session;
c099397a
MD		 3709 int ret = 0;
3710
ee7e9a18
MD		 3711 if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER)
3712 return 0;
3713 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3714 chan = event_recorder->chan;
3715 session = chan->parent.session;
3716
a67ba386 3717 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3718 return 0;
f7d06400 3719 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3720 return 0;
3721
8b97fd42
MD		 3722 lttng_metadata_begin(session);
3723
c099397a
MD		 3724 ret = lttng_metadata_printf(session,
3725 "event {\n"
ae734547 3726 " name = \"%s\";\n"
c099397a 3727 " id = %u;\n"
b9074a1b 3728 " stream_id = %u;\n",
a67ba386
MD		 3729 event_recorder->priv->parent.desc->event_name,
3730 event_recorder->priv->id,
f7d06400 3731 event_recorder->chan->priv->id);
c099397a
MD		 3732 if (ret)
3733 goto end;
3734
8070f5c0 3735 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3736 " fields := struct {\n"
3737 );
3738 if (ret)
3739 goto end;
3740
a67ba386 3741 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3742 if (ret)
3743 goto end;
3744
3745 /*
3746 * LTTng space reservation can only reserve multiples of the
3747 * byte size.
3748 */
3749 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3750 " };\n"
3751 "};\n\n");
c099397a
MD		 3752 if (ret)
3753 goto end;
3754
a67ba386 3755 event_recorder->priv->metadata_dumped = 1;
c099397a 3756end:
8b97fd42 3757 lttng_metadata_end(session);
c099397a
MD		 3758 return ret;
3759
3760}
3761
d83004aa
JD		 3762/*
3763 * Must be called with sessions_mutex held.
8b97fd42
MD		 3764 * The entire channel metadata is printed as a single atomic metadata
3765 * transaction.
d83004aa 3766 */
c099397a 3767static
8cdc1a81 3768int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3769 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3770{
3771 int ret = 0;
3772
f7d06400 3773 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3774 return 0;
d83004aa 3775
f7d06400 3776 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3777 return 0;
3778
8b97fd42
MD		 3779 lttng_metadata_begin(session);
3780
f7d06400 3781 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3782 ret = lttng_metadata_printf(session,
3783 "stream {\n"
3784 " id = %u;\n"
9115fbdc 3785 " event.header := %s;\n"
b9074a1b 3786 " packet.context := struct packet_context;\n",
f7d06400
MD		 3787 chan->priv->id,
3788 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3789 "struct event_header_large");
3790 if (ret)
3791 goto end;
3792
f7d06400 3793 if (chan->priv->ctx) {
b9074a1b
MD		 3794 ret = lttng_metadata_printf(session,
3795 " event.context := struct {\n");
3796 if (ret)
3797 goto end;
3798 }
f7d06400 3799 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3800 if (ret)
3801 goto end;
f7d06400 3802 if (chan->priv->ctx) {
b9074a1b
MD		 3803 ret = lttng_metadata_printf(session,
3804 " };\n");
3805 if (ret)
3806 goto end;
3807 }
8070f5c0
MD		 3808
3809 ret = lttng_metadata_printf(session,
b9074a1b 3810 "};\n\n");
8070f5c0 3811
f7d06400 3812 chan->priv->metadata_dumped = 1;
c099397a 3813end:
8b97fd42 3814 lttng_metadata_end(session);
c099397a
MD		 3815 return ret;
3816}
3817
d83004aa
JD		 3818/*
3819 * Must be called with sessions_mutex held.
3820 */
9115fbdc 3821static
8cdc1a81 3822int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3823{
3824 return lttng_metadata_printf(session,
3825 "struct packet_context {\n"
a3ccff4f
MD		 3826 " uint64_clock_monotonic_t timestamp_begin;\n"
3827 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3828 " uint64_t content_size;\n"
3829 " uint64_t packet_size;\n"
5b3cf4f9 3830 " uint64_t packet_seq_num;\n"
a9afe705 3831 " unsigned long events_discarded;\n"
9115fbdc 3832 " uint32_t cpu_id;\n"
c6dfdf6f 3833 "};\n\n"
9115fbdc
MD		 3834 );
3835}
3836
3837/*
3838 * Compact header:
3839 * id: range: 0 - 30.
3840 * id 31 is reserved to indicate an extended header.
3841 *
3842 * Large header:
3843 * id: range: 0 - 65534.
3844 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3845 *
3846 * Must be called with sessions_mutex held.
9115fbdc
MD		 3847 */
3848static
8cdc1a81 3849int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3850{
3851 return lttng_metadata_printf(session,
3852 "struct event_header_compact {\n"
3853 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3854 " variant <id> {\n"
3855 " struct {\n"
a3ccff4f 3856 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3857 " } compact;\n"
3858 " struct {\n"
3859 " uint32_t id;\n"
a3ccff4f 3860 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3861 " } extended;\n"
3862 " } v;\n"
3863 "} align(%u);\n"
3864 "\n"
3865 "struct event_header_large {\n"
3866 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3867 " variant <id> {\n"
3868 " struct {\n"
a3ccff4f 3869 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3870 " } compact;\n"
3871 " struct {\n"
3872 " uint32_t id;\n"
a3ccff4f 3873 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3874 " } extended;\n"
3875 " } v;\n"
3876 "} align(%u);\n\n",
a90917c3
MD		 3877 lttng_alignof(uint32_t) * CHAR_BIT,
3878 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3879 );
3880}
3881
a3ccff4f
MD		 3882 /*
3883 * Approximation of NTP time of day to clock monotonic correlation,
3884 * taken at start of trace.
3885 * Yes, this is only an approximation. Yes, we can (and will) do better
3886 * in future versions.
5283350b
MD		 3887 * This function may return a negative offset. It may happen if the
3888 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3889 *
3890 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3891 * y2038 compliant.
a3ccff4f
MD		 3892 */
3893static
8967b2a3 3894int64_t measure_clock_offset(void)
a3ccff4f 3895{
dcb93448 3896 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3897 uint64_t tcf = trace_clock_freq();
dcb93448 3898 int64_t offset;
a3ccff4f 3899 unsigned long flags;
3636085f
MJ		 3900#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3901 struct timespec64 rts = { 0, 0 };
3902#else
3903 struct timespec rts = { 0, 0 };
3904#endif
a3ccff4f
MD		 3905
3906 /* Disable interrupts to increase correlation precision. */
3907 local_irq_save(flags);
3908 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3909#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3910 ktime_get_real_ts64(&rts);
3911#else
216b6baa 3912 getnstimeofday(&rts);
3636085f 3913#endif
a3ccff4f
MD		 3914 monotonic[1] = trace_clock_read64();
3915 local_irq_restore(flags);
3916
dcb93448 3917 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3918 realtime = (uint64_t) rts.tv_sec * tcf;
3919 if (tcf == NSEC_PER_SEC) {
3920 realtime += rts.tv_nsec;
3921 } else {
3922 uint64_t n = rts.tv_nsec * tcf;
3923
3924 do_div(n, NSEC_PER_SEC);
3925 realtime += n;
3926 }
dcb93448 3927 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3928 return offset;
3929}
3930
3eb95be4 3931static
8cdc1a81 3932int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3933{
0f3eaad4 3934 int ret = 0;
3eb95be4
JR		 3935 size_t i;
3936 char cur;
3937
3938 i = 0;
3939 cur = string[i];
3940 while (cur != '\0') {
3941 switch (cur) {
3942 case '\n':
3943 ret = lttng_metadata_printf(session, "%s", "\\n");
3944 break;
3945 case '\\':
3946 case '"':
3947 ret = lttng_metadata_printf(session, "%c", '\\');
3948 if (ret)
3949 goto error;
3950 /* We still print the current char */
c190d76e 3951 lttng_fallthrough;
3eb95be4
JR		 3952 default:
3953 ret = lttng_metadata_printf(session, "%c", cur);
3954 break;
3955 }
3956
3957 if (ret)
3958 goto error;
3959
3960 cur = string[++i];
3961 }
3962error:
3963 return ret;
3964}
3965
3966static
8cdc1a81 3967int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3968 const char *field_value)
3eb95be4
JR		 3969{
3970 int ret;
3971
1c88f269 3972 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3973 if (ret)
3974 goto error;
3975
1c88f269 3976 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3977 if (ret)
3978 goto error;
3979
3980 ret = lttng_metadata_printf(session, "\";\n");
3981
3982error:
3983 return ret;
3984}
3985
c099397a
MD		 3986/*
3987 * Output metadata into this session's metadata buffers.
d83004aa 3988 * Must be called with sessions_mutex held.
c099397a
MD		 3989 */
3990static
8cdc1a81 3991int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3992{
8cdc1a81 3993 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3994 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3995 const char *product_uuid;
f7d06400 3996 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3997 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3998 int ret = 0;
3999
585e5dcc 4000 if (!LTTNG_READ_ONCE(session->active))
c099397a 4001 return 0;
8b97fd42
MD		 4002
4003 lttng_metadata_begin(session);
4004
8cdc1a81 4005 if (session->priv->metadata_dumped)
c099397a 4006 goto skip_session;
c099397a 4007
d793d5e1 4008 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 4009 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
4010 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
4011 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
4012 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
4013 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 4014
4015 ret = lttng_metadata_printf(session,
9115fbdc
MD		 4016 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4017 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4018 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4019 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 4020 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 4021 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4022 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 4023 "\n"
4024 "trace {\n"
4025 " major = %u;\n"
4026 " minor = %u;\n"
30bdb6e4 4027 " uuid = \"%s\";\n"
d793d5e1
MD		 4028 " byte_order = %s;\n"
4029 " packet.header := struct {\n"
4030 " uint32_t magic;\n"
1ec3f75a 4031 " uint8_t uuid[16];\n"
d793d5e1 4032 " uint32_t stream_id;\n"
5594698f 4033 " uint64_t stream_instance_id;\n"
0eb25f58 4034 " };\n"
d793d5e1 4035 "};\n\n",
a90917c3
MD		 4036 lttng_alignof(uint8_t) * CHAR_BIT,
4037 lttng_alignof(uint16_t) * CHAR_BIT,
4038 lttng_alignof(uint32_t) * CHAR_BIT,
4039 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 4040 sizeof(unsigned long) * CHAR_BIT,
4041 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 4042 CTF_SPEC_MAJOR,
4043 CTF_SPEC_MINOR,
d793d5e1 4044 uuid_s,
5214fa50 4045#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 4046 "be"
4047#else
4048 "le"
4049#endif
4050 );
4051 if (ret)
4052 goto end;
4053
99dc9597
MD		 4054 ret = lttng_metadata_printf(session,
4055 "env {\n"
a6058143 4056 " hostname = \"%s\";\n"
c6c9e10f 4057 " domain = \"kernel\";\n"
99dc9597 4058 " sysname = \"%s\";\n"
c6c9e10f
MD		 4059 " kernel_release = \"%s\";\n"
4060 " kernel_version = \"%s\";\n"
4061 " tracer_name = \"lttng-modules\";\n"
4062 " tracer_major = %d;\n"
4063 " tracer_minor = %d;\n"
4064 " tracer_patchlevel = %d;\n"
3eb95be4 4065 " trace_buffering_scheme = \"global\";\n",
3d0d43db 4066 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 4067 utsname()->sysname,
4068 utsname()->release,
c6c9e10f
MD		 4069 utsname()->version,
4070 LTTNG_MODULES_MAJOR_VERSION,
4071 LTTNG_MODULES_MINOR_VERSION,
4072 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 4073 );
4074 if (ret)
4075 goto end;
4076
8cdc1a81 4077 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4078 if (ret)
4079 goto end;
4080 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4081 session->priv->creation_time);
3eb95be4
JR		 4082 if (ret)
4083 goto end;
4084
c88f762e
GB		 4085 /* Add the product UUID to the 'env' section */
4086 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4087 if (product_uuid) {
4088 ret = lttng_metadata_printf(session,
4089 " product_uuid = \"%s\";\n",
4090 product_uuid
4091 );
4092 if (ret)
4093 goto end;
4094 }
4095
4096 /* Close the 'env' section */
3eb95be4
JR		 4097 ret = lttng_metadata_printf(session, "};\n\n");
4098 if (ret)
4099 goto end;
4100
a3ccff4f
MD		 4101 ret = lttng_metadata_printf(session,
4102 "clock {\n"
2754583e
MD		 4103 " name = \"%s\";\n",
4104 trace_clock_name()
a82c63f1
MD		 4105 );
4106 if (ret)
4107 goto end;
4108
4109 if (!trace_clock_uuid(clock_uuid_s)) {
4110 ret = lttng_metadata_printf(session,
7c27cb17 4111 " uuid = \"%s\";\n",
a82c63f1
MD		 4112 clock_uuid_s
4113 );
4114 if (ret)
4115 goto end;
4116 }
4117
4118 ret = lttng_metadata_printf(session,
2754583e 4119 " description = \"%s\";\n"
a3ccff4f
MD		 4120 " freq = %llu; /* Frequency, in Hz */\n"
4121 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4122 " offset = %lld;\n"
a3ccff4f 4123 "};\n\n",
2754583e 4124 trace_clock_description(),
a3ccff4f 4125 (unsigned long long) trace_clock_freq(),
8967b2a3 4126 (long long) measure_clock_offset()
a3ccff4f
MD		 4127 );
4128 if (ret)
4129 goto end;
4130
4131 ret = lttng_metadata_printf(session,
4132 "typealias integer {\n"
4133 " size = 27; align = 1; signed = false;\n"
2754583e 4134 " map = clock.%s.value;\n"
a3ccff4f
MD		 4135 "} := uint27_clock_monotonic_t;\n"
4136 "\n"
4137 "typealias integer {\n"
4138 " size = 32; align = %u; signed = false;\n"
2754583e 4139 " map = clock.%s.value;\n"
a3ccff4f
MD		 4140 "} := uint32_clock_monotonic_t;\n"
4141 "\n"
4142 "typealias integer {\n"
4143 " size = 64; align = %u; signed = false;\n"
2754583e 4144 " map = clock.%s.value;\n"
a3ccff4f 4145 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4146 trace_clock_name(),
a3ccff4f 4147 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4148 trace_clock_name(),
4149 lttng_alignof(uint64_t) * CHAR_BIT,
4150 trace_clock_name()
a3ccff4f
MD		 4151 );
4152 if (ret)
4153 goto end;
4154
a90917c3 4155 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4156 if (ret)
4157 goto end;
4158
a90917c3 4159 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4160 if (ret)
4161 goto end;
4162
c099397a 4163skip_session:
f7d06400
MD		 4164 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4165 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4166 if (ret)
4167 goto end;
4168 }
4169
f237aef8 4170 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
ee7e9a18 4171 ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent);
c099397a
MD		 4172 if (ret)
4173 goto end;
4174 }
8cdc1a81 4175 session->priv->metadata_dumped = 1;
c099397a 4176end:
8b97fd42 4177 lttng_metadata_end(session);
c099397a
MD		 4178 return ret;
4179}
4180
c0e31d2e 4181/**
a90917c3 4182 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4183 * @transport: transport structure
4184 *
4185 * Registers a transport which can be used as output to extract the data out of
4186 * LTTng. The module calling this registration function must ensure that no
4187 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4188 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4189 * is made visible to the transport function. This registration acts as a
263b6c88 4190 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4191 * after its registration must it synchronize the TLBs.
4192 */
a90917c3 4193void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4194{
4195 /*
4196 * Make sure no page fault can be triggered by the module about to be
4197 * registered. We deal with this here so we don't have to call
263b6c88 4198 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4199 */
263b6c88 4200 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4201
4202 mutex_lock(&sessions_mutex);
a90917c3 4203 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4204 mutex_unlock(&sessions_mutex);
4205}
a90917c3 4206EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4207
4208/**
a90917c3 4209 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4210 * @transport: transport structure
4211 */
a90917c3 4212void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4213{
4214 mutex_lock(&sessions_mutex);
4215 list_del(&transport->node);
4216 mutex_unlock(&sessions_mutex);
4217}
a90917c3 4218EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4219
a101fa10
MD		 4220void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4221{
4222 /*
4223 * Make sure no page fault can be triggered by the module about to be
4224 * registered. We deal with this here so we don't have to call
4225 * vmalloc_sync_mappings() in each module's init.
4226 */
4227 wrapper_vmalloc_sync_mappings();
4228
4229 mutex_lock(&sessions_mutex);
4230 list_add_tail(&transport->node, &lttng_counter_transport_list);
4231 mutex_unlock(&sessions_mutex);
4232}
4233EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4234
4235void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4236{
4237 mutex_lock(&sessions_mutex);
4238 list_del(&transport->node);
4239 mutex_unlock(&sessions_mutex);
4240}
4241EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4242
5f4c791e 4243#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4244
4245enum cpuhp_state lttng_hp_prepare;
4246enum cpuhp_state lttng_hp_online;
4247
4248static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4249{
4250 struct lttng_cpuhp_node *lttng_node;
4251
4252 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4253 switch (lttng_node->component) {
4254 case LTTNG_RING_BUFFER_FRONTEND:
4255 return 0;
4256 case LTTNG_RING_BUFFER_BACKEND:
4257 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4258 case LTTNG_RING_BUFFER_ITER:
4259 return 0;
4260 case LTTNG_CONTEXT_PERF_COUNTERS:
4261 return 0;
4262 default:
4263 return -EINVAL;
4264 }
4265}
4266
4267static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4268{
4269 struct lttng_cpuhp_node *lttng_node;
4270
4271 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4272 switch (lttng_node->component) {
4273 case LTTNG_RING_BUFFER_FRONTEND:
4274 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4275 case LTTNG_RING_BUFFER_BACKEND:
4276 return 0;
4277 case LTTNG_RING_BUFFER_ITER:
4278 return 0;
4279 case LTTNG_CONTEXT_PERF_COUNTERS:
4280 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4281 default:
4282 return -EINVAL;
4283 }
4284}
4285
4286static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4287{
4288 struct lttng_cpuhp_node *lttng_node;
4289
4290 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4291 switch (lttng_node->component) {
4292 case LTTNG_RING_BUFFER_FRONTEND:
4293 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4294 case LTTNG_RING_BUFFER_BACKEND:
4295 return 0;
4296 case LTTNG_RING_BUFFER_ITER:
4297 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4298 case LTTNG_CONTEXT_PERF_COUNTERS:
4299 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4300 default:
4301 return -EINVAL;
4302 }
4303}
4304
4305static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4306{
4307 struct lttng_cpuhp_node *lttng_node;
4308
4309 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4310 switch (lttng_node->component) {
4311 case LTTNG_RING_BUFFER_FRONTEND:
4312 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4313 case LTTNG_RING_BUFFER_BACKEND:
4314 return 0;
4315 case LTTNG_RING_BUFFER_ITER:
4316 return 0;
4317 case LTTNG_CONTEXT_PERF_COUNTERS:
4318 return 0;
4319 default:
4320 return -EINVAL;
4321 }
4322}
4323
4324static int __init lttng_init_cpu_hotplug(void)
4325{
4326 int ret;
4327
4328 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4329 lttng_hotplug_prepare,
4330 lttng_hotplug_dead);
4331 if (ret < 0) {
4332 return ret;
4333 }
4334 lttng_hp_prepare = ret;
4335 lttng_rb_set_hp_prepare(ret);
4336
4337 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4338 lttng_hotplug_online,
4339 lttng_hotplug_offline);
4340 if (ret < 0) {
4341 cpuhp_remove_multi_state(lttng_hp_prepare);
4342 lttng_hp_prepare = 0;
4343 return ret;
4344 }
4345 lttng_hp_online = ret;
4346 lttng_rb_set_hp_online(ret);
4347
4348 return 0;
4349}
4350
4351static void __exit lttng_exit_cpu_hotplug(void)
4352{
4353 lttng_rb_set_hp_online(0);
4354 cpuhp_remove_multi_state(lttng_hp_online);
4355 lttng_rb_set_hp_prepare(0);
4356 cpuhp_remove_multi_state(lttng_hp_prepare);
4357}
4358
5f4c791e 4359#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4360static int lttng_init_cpu_hotplug(void)
4361{
4362 return 0;
4363}
4364static void lttng_exit_cpu_hotplug(void)
4365{
4366}
5f4c791e 4367#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4368
a90917c3 4369static int __init lttng_events_init(void)
4e3c1b9b 4370{
1c25284c
MD		 4371 int ret;
4372
453b2495
JD		 4373 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4374 if (ret)
4375 return ret;
389d7070 4376 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4377 if (ret)
4378 return ret;
4379 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4380 if (ret)
4381 return ret;
4382 ret = lttng_probes_init();
389d7070
MD		 4383 if (ret)
4384 return ret;
07dfc1d0 4385 ret = lttng_context_init();
20591cf7
MD		 4386 if (ret)
4387 return ret;
07dfc1d0
MD		 4388 ret = lttng_tracepoint_init();
4389 if (ret)
4390 goto error_tp;
a67ba386
MD		 4391 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4392 if (!event_recorder_cache) {
20591cf7 4393 ret = -ENOMEM;
a67ba386 4394 goto error_kmem_event_recorder;
dffef45d 4395 }
a67ba386
MD		 4396 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4397 if (!event_recorder_private_cache) {
4398 ret = -ENOMEM;
4399 goto error_kmem_event_recorder_private;
4400 }
4401 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4402 if (!event_notifier_cache) {
4403 ret = -ENOMEM;
4404 goto error_kmem_event_notifier;
20591cf7 4405 }
a67ba386
MD		 4406 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4407 if (!event_notifier_private_cache) {
4408 ret = -ENOMEM;
4409 goto error_kmem_event_notifier_private;
4410 }
80996790 4411 ret = lttng_abi_init();
02119ee5
MD		 4412 if (ret)
4413 goto error_abi;
0c956676
MD		 4414 ret = lttng_logger_init();
4415 if (ret)
4416 goto error_logger;
1e367326
MD		 4417 ret = lttng_init_cpu_hotplug();
4418 if (ret)
4419 goto error_hotplug;
101215b7 4420 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4421 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4422 __stringify(LTTNG_MODULES_MINOR_VERSION),
4423 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4424 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4425 LTTNG_VERSION_NAME,
4426#ifdef LTTNG_EXTRA_VERSION_GIT
4427 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4428#else
4429 "",
4430#endif
4431#ifdef LTTNG_EXTRA_VERSION_NAME
4432 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4433#else
4434 "");
4435#endif
c1551e57
MJ		 4436#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4437 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4438#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4439 return 0;
0c956676 4440
1e367326
MD		 4441error_hotplug:
4442 lttng_logger_exit();
0c956676
MD		 4443error_logger:
4444 lttng_abi_exit();
02119ee5 4445error_abi:
a67ba386
MD		 4446 kmem_cache_destroy(event_notifier_private_cache);
4447error_kmem_event_notifier_private:
dffef45d
FD		 4448 kmem_cache_destroy(event_notifier_cache);
4449error_kmem_event_notifier:
a67ba386
MD		 4450 kmem_cache_destroy(event_recorder_private_cache);
4451error_kmem_event_recorder_private:
4452 kmem_cache_destroy(event_recorder_cache);
4453error_kmem_event_recorder:
20591cf7 4454 lttng_tracepoint_exit();
07dfc1d0
MD		 4455error_tp:
4456 lttng_context_exit();
101215b7 4457 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4458 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4459 __stringify(LTTNG_MODULES_MINOR_VERSION),
4460 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4461 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4462 LTTNG_VERSION_NAME,
4463#ifdef LTTNG_EXTRA_VERSION_GIT
4464 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4465#else
4466 "",
4467#endif
4468#ifdef LTTNG_EXTRA_VERSION_NAME
4469 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4470#else
4471 "");
4472#endif
1c25284c 4473 return ret;
4e3c1b9b
MD		 4474}
4475
a90917c3 4476module_init(lttng_events_init);
11b5a3c2 4477
a90917c3 4478static void __exit lttng_events_exit(void)
4e3c1b9b 4479{
8cdc1a81 4480 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4481
1e367326 4482 lttng_exit_cpu_hotplug();
0c956676 4483 lttng_logger_exit();
80996790 4484 lttng_abi_exit();
8cdc1a81
MD		 4485 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4486 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4487 kmem_cache_destroy(event_recorder_cache);
4488 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4489 kmem_cache_destroy(event_notifier_cache);
a67ba386 4490 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4491 lttng_tracepoint_exit();
07dfc1d0 4492 lttng_context_exit();
101215b7 4493 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4494 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4495 __stringify(LTTNG_MODULES_MINOR_VERSION),
4496 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4497 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4498 LTTNG_VERSION_NAME,
4499#ifdef LTTNG_EXTRA_VERSION_GIT
4500 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4501#else
4502 "",
4503#endif
4504#ifdef LTTNG_EXTRA_VERSION_NAME
4505 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4506#else
4507 "");
4508#endif
4e3c1b9b 4509}
92e94819 4510
a90917c3 4511module_exit(lttng_events_exit);
11b5a3c2 4512
7ca11e77 4513#include <generated/patches.h>
101215b7
MJ		 4514#ifdef LTTNG_EXTRA_VERSION_GIT
4515MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4516#endif
4517#ifdef LTTNG_EXTRA_VERSION_NAME
4518MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4519#endif
92e94819
MD		 4520MODULE_LICENSE("GPL and additional rights");
4521MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4522MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4523MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4524 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4525 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4526 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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