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