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Split ID tracker into public/private structures
[lttng-modules.git] / src / lttng-events.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
a90917c3 3 * lttng-events.c
4e3c1b9b 4 *
4e3c1b9b 5 * Holds LTTng per-session event registry.
17baffe2 6 *
886d51a3 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4e3c1b9b
MD		 8 */
9
389d7070
MD		 10/*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14#include "wrapper/page_alloc.h"
15
4e3c1b9b 16#include <linux/module.h>
c0e31d2e
MD		 17#include <linux/mutex.h>
18#include <linux/sched.h>
11b5a3c2 19#include <linux/slab.h>
c099397a 20#include <linux/jiffies.h>
99dc9597 21#include <linux/utsname.h>
abc0446a 22#include <linux/err.h>
7e6f9ef6
MD		 23#include <linux/seq_file.h>
24#include <linux/file.h>
25#include <linux/anon_inodes.h>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
a7008254 31#include <wrapper/uuid.h>
263b6c88 32#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 33#include <wrapper/random.h>
34#include <wrapper/tracepoint.h>
35#include <wrapper/list.h>
cbc19040 36#include <wrapper/types.h>
2df37e95
MD		 37#include <lttng/kernel-version.h>
38#include <lttng/events.h>
92bc1e23 39#include <lttng/events-internal.h>
0b365677 40#include <lttng/lttng-bytecode.h>
2df37e95 41#include <lttng/tracer.h>
21f58fb7 42#include <lttng/event-notifier-notification.h>
2df37e95
MD		 43#include <lttng/abi-old.h>
44#include <lttng/endian.h>
45#include <lttng/string-utils.h>
4a11ef1c 46#include <lttng/utils.h>
24591303
MD		 47#include <ringbuffer/backend.h>
48#include <ringbuffer/frontend.h>
3636085f 49#include <wrapper/time.h>
4e3c1b9b 50
d83004aa
JD		 51#define METADATA_CACHE_DEFAULT_SIZE 4096
52
4e3c1b9b 53static LIST_HEAD(sessions);
750b05f2 54static LIST_HEAD(event_notifier_groups);
a90917c3 55static LIST_HEAD(lttng_transport_list);
a101fa10 56static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 57/*
58 * Protect the sessions and metadata caches.
59 */
4e3c1b9b 60static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 61static struct kmem_cache *event_recorder_cache;
62static struct kmem_cache *event_recorder_private_cache;
dffef45d 63static struct kmem_cache *event_notifier_cache;
a67ba386 64static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 65
8cdc1a81
MD		 66static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
67static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b2bc0bc8 68static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
dffef45d 69static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
b01155ba 70static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
3c997079 71
0648898e 72static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
a90917c3 73static void _lttng_channel_destroy(struct lttng_channel *chan);
a67ba386
MD		 74static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event);
75static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier);
c099397a 76static
8cdc1a81 77int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
a90917c3 78 struct lttng_channel *chan,
a67ba386 79 struct lttng_kernel_event_recorder *event);
c099397a 80static
8cdc1a81 81int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 82static
83void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 84static
8cdc1a81 85int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 86 const struct lttng_kernel_type_common *type,
87 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 88 size_t nesting);
89static
8cdc1a81 90int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 91 const struct lttng_kernel_event_field *field,
51ef4536 92 size_t nesting, const char **prev_field_name_p);
c099397a 93
c099397a 94void synchronize_trace(void)
abcca994 95{
5f4c791e 96#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
92da05ce
MJ		 97 synchronize_rcu();
98#else
abcca994 99 synchronize_sched();
92da05ce
MJ		 100#endif
101
5f4c791e 102#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 103#ifdef CONFIG_PREEMPT_RT_FULL
104 synchronize_rcu();
105#endif
5f4c791e 106#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 107#ifdef CONFIG_PREEMPT_RT
108 synchronize_rcu();
109#endif
5f4c791e 110#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 111}
112
3c997079
MD		 113void lttng_lock_sessions(void)
114{
115 mutex_lock(&sessions_mutex);
116}
117
118void lttng_unlock_sessions(void)
119{
120 mutex_unlock(&sessions_mutex);
121}
122
9fe593d2
FD		 123static struct lttng_transport *lttng_transport_find(const char *name)
124{
125 struct lttng_transport *transport;
126
127 list_for_each_entry(transport, &lttng_transport_list, node) {
128 if (!strcmp(transport->name, name))
129 return transport;
130 }
131 return NULL;
132}
133
3c997079
MD		 134/*
135 * Called with sessions lock held.
136 */
137int lttng_session_active(void)
138{
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);
324 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
325 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
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{
a90917c3 353 struct lttng_channel *chan, *tmpchan;
a67ba386 354 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 355 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 356 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 357 int ret;
4e3c1b9b
MD		 358
359 mutex_lock(&sessions_mutex);
a8f2d0c7 360 WRITE_ONCE(session->active, 0);
8cdc1a81 361 list_for_each_entry(chan, &session->priv->chan, list) {
3b82c4e1 362 ret = lttng_syscalls_unregister_channel(chan);
1ec65de1
MD		 363 WARN_ON(ret);
364 }
8cdc1a81 365 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 366 ret = _lttng_event_unregister(event_recorder_priv->pub);
dda6a249
MD		 367 WARN_ON(ret);
368 }
abcca994 369 synchronize_trace(); /* Wait for in-flight events to complete */
8cdc1a81 370 list_for_each_entry(chan, &session->priv->chan, list) {
2d6d88c6 371 ret = lttng_syscalls_destroy_event(chan);
badfe9f5
MD		 372 WARN_ON(ret);
373 }
b2bc0bc8 374 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
8cdc1a81 375 &session->priv->enablers_head, node)
b2bc0bc8 376 lttng_event_enabler_destroy(event_enabler);
8cdc1a81 377 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node)
0648898e 378 _lttng_event_destroy(&event_recorder_priv->pub->parent);
8cdc1a81 379 list_for_each_entry_safe(chan, tmpchan, &session->priv->chan, list) {
d83004aa 380 BUG_ON(chan->channel_type == METADATA_CHANNEL);
a90917c3 381 _lttng_channel_destroy(chan);
d83004aa 382 }
8cdc1a81
MD		 383 mutex_lock(&session->priv->metadata_cache->lock);
384 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
d83004aa 385 _lttng_metadata_channel_hangup(metadata_stream);
8cdc1a81 386 mutex_unlock(&session->priv->metadata_cache->lock);
8c0393c3
MD		 387 lttng_id_tracker_fini(&session->pid_tracker);
388 lttng_id_tracker_fini(&session->vpid_tracker);
389 lttng_id_tracker_fini(&session->uid_tracker);
390 lttng_id_tracker_fini(&session->vuid_tracker);
391 lttng_id_tracker_fini(&session->gid_tracker);
392 lttng_id_tracker_fini(&session->vgid_tracker);
8cdc1a81
MD		 393 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
394 list_del(&session->priv->list);
4e3c1b9b 395 mutex_unlock(&sessions_mutex);
8cdc1a81 396 lttng_kvfree(session->priv);
48f5e0b5 397 lttng_kvfree(session);
4e3c1b9b
MD		 398}
399
dffef45d
FD		 400void lttng_event_notifier_group_destroy(
401 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 402{
dffef45d 403 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
a67ba386 404 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 405 int ret;
406
750b05f2
FD		 407 if (!event_notifier_group)
408 return;
409
410 mutex_lock(&sessions_mutex);
dffef45d 411
3b82c4e1 412 ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group);
8a8ac9a8
FD		 413 WARN_ON(ret);
414
a67ba386
MD		 415 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
416 &event_notifier_group->event_notifiers_head, node) {
417 ret = _lttng_event_notifier_unregister(event_notifier_priv->pub);
dffef45d
FD		 418 WARN_ON(ret);
419 }
420
b01155ba
FD		 421 /* Wait for in-flight event notifier to complete */
422 synchronize_trace();
423
21f58fb7
FD		 424 irq_work_sync(&event_notifier_group->wakeup_pending);
425
8a8ac9a8
FD		 426 kfree(event_notifier_group->sc_filter);
427
dffef45d
FD		 428 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
429 &event_notifier_group->enablers_head, node)
430 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
431
a67ba386
MD		 432 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
433 &event_notifier_group->event_notifiers_head, 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;
a90917c3 466 struct lttng_channel *chan;
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 */
8cdc1a81 484 list_for_each_entry(chan, &session->priv->chan, list) {
c099397a
MD		 485 if (chan->header_type)
486 continue; /* don't change it if session stop/restart */
487 if (chan->free_event_id < 31)
488 chan->header_type = 1; /* compact */
489 else
490 chan->header_type = 2; /* large */
491 }
492
64af2437 493 /* Clear each stream's quiescent state. */
8cdc1a81 494 list_for_each_entry(chan, &session->priv->chan, list) {
09b93db9
MD		 495 if (chan->channel_type != METADATA_CHANNEL)
496 lib_ring_buffer_clear_quiescent_channel(chan->chan);
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;
64af2437 517 struct lttng_channel *chan;
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. */
8cdc1a81 531 list_for_each_entry(chan, &session->priv->chan, list) {
09b93db9
MD		 532 if (chan->channel_type != METADATA_CHANNEL)
533 lib_ring_buffer_set_quiescent_channel(chan->chan);
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;
543 struct lttng_channel *chan;
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
MD		 564 session->priv->metadata_dumped = 0;
565 list_for_each_entry(chan, &session->priv->chan, list) {
9616f0bf
JD		 566 chan->metadata_dumped = 0;
567 }
568
8cdc1a81 569 list_for_each_entry(event_recorder_priv, &session->priv->events, 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
a90917c3 580int lttng_channel_enable(struct lttng_channel *channel)
e64957da 581{
3c997079 582 int ret = 0;
e64957da 583
3c997079
MD		 584 mutex_lock(&sessions_mutex);
585 if (channel->channel_type == METADATA_CHANNEL) {
586 ret = -EPERM;
587 goto end;
588 }
589 if (channel->enabled) {
590 ret = -EEXIST;
591 goto end;
592 }
593 /* Set transient enabler state to "enabled" */
594 channel->tstate = 1;
b2bc0bc8 595 lttng_session_sync_event_enablers(channel->session);
3c997079 596 /* Set atomically the state to "enabled" */
a8f2d0c7 597 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 598end:
599 mutex_unlock(&sessions_mutex);
600 return ret;
e64957da
MD		 601}
602
a90917c3 603int lttng_channel_disable(struct lttng_channel *channel)
e64957da 604{
3c997079 605 int ret = 0;
e64957da 606
3c997079
MD		 607 mutex_lock(&sessions_mutex);
608 if (channel->channel_type == METADATA_CHANNEL) {
609 ret = -EPERM;
610 goto end;
611 }
612 if (!channel->enabled) {
613 ret = -EEXIST;
614 goto end;
615 }
616 /* Set atomically the state to "disabled" */
a8f2d0c7 617 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 618 /* Set transient enabler state to "enabled" */
619 channel->tstate = 0;
b2bc0bc8 620 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 621end:
622 mutex_unlock(&sessions_mutex);
623 return ret;
e64957da
MD		 624}
625
9d993668 626int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 627{
3c997079 628 int ret = 0;
e64957da 629
3c997079 630 mutex_lock(&sessions_mutex);
9d993668
MD		 631 switch (event->type) {
632 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
633 {
634 struct lttng_kernel_event_recorder *event_recorder =
635 container_of(event, struct lttng_kernel_event_recorder, parent);
636
637 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
638 ret = -EPERM;
639 goto end;
640 }
a0493bef 641 break;
9d993668
MD		 642 }
643 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
644 switch (event->priv->instrumentation) {
645 case LTTNG_KERNEL_ABI_KRETPROBE:
646 ret = -EINVAL;
647 goto end;
648 default:
649 break;
650 }
a0493bef
MD		 651 break;
652 default:
9d993668 653 break;
a0493bef 654 }
e64957da 655
9d993668 656 if (event->enabled) {
3c997079
MD		 657 ret = -EEXIST;
658 goto end;
659 }
a67ba386 660 switch (event->priv->instrumentation) {
606828e4
MD		 661 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
662 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 663 ret = -EINVAL;
664 break;
b4a75708 665
606828e4
MD		 666 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
667 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 668 WRITE_ONCE(event->enabled, 1);
a0493bef 669 break;
b4a75708 670
606828e4 671 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 672 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 673 break;
b4a75708 674
606828e4
MD		 675 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
676 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 677 default:
678 WARN_ON_ONCE(1);
679 ret = -EINVAL;
680 }
3c997079
MD		 681end:
682 mutex_unlock(&sessions_mutex);
683 return ret;
e64957da
MD		 684}
685
9d993668 686int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 687{
688 int ret = 0;
689
690 mutex_lock(&sessions_mutex);
9d993668
MD		 691 switch (event->type) {
692 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
693 {
694 struct lttng_kernel_event_recorder *event_recorder =
695 container_of(event, struct lttng_kernel_event_recorder, parent);
696
697 if (event_recorder->chan->channel_type == METADATA_CHANNEL) {
698 ret = -EPERM;
699 goto end;
700 }
b01155ba 701 break;
9d993668
MD		 702 }
703 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
704 switch (event->priv->instrumentation) {
705 case LTTNG_KERNEL_ABI_KRETPROBE:
706 ret = -EINVAL;
707 goto end;
708 default:
709 break;
710 }
2b16f0c9 711 break;
dffef45d 712 default:
9d993668 713 break;
dffef45d 714 }
dffef45d 715
a67ba386 716 if (!event->enabled) {
dffef45d
FD		 717 ret = -EEXIST;
718 goto end;
719 }
a67ba386 720 switch (event->priv->instrumentation) {
606828e4
MD		 721 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
722 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 723 ret = -EINVAL;
724 break;
b4a75708 725
606828e4
MD		 726 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
727 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 728 WRITE_ONCE(event->enabled, 0);
2b16f0c9 729 break;
b4a75708 730
9d993668
MD		 731 case LTTNG_KERNEL_ABI_KRETPROBE:
732 ret = lttng_kretprobes_event_enable_state(event, 0);
733 break;
734
606828e4 735 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
606828e4 736 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 737 default:
738 WARN_ON_ONCE(1);
739 ret = -EINVAL;
740 }
741end:
742 mutex_unlock(&sessions_mutex);
743 return ret;
744}
745
8cdc1a81 746struct lttng_channel *lttng_channel_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 747 const char *transport_name,
748 void *buf_addr,
4e3c1b9b
MD		 749 size_t subbuf_size, size_t num_subbuf,
750 unsigned int switch_timer_interval,
d83004aa
JD		 751 unsigned int read_timer_interval,
752 enum channel_type channel_type)
4e3c1b9b 753{
a90917c3
MD		 754 struct lttng_channel *chan;
755 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 756
757 mutex_lock(&sessions_mutex);
8cdc1a81 758 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 759 goto active; /* Refuse to add channel to active session */
a90917c3 760 transport = lttng_transport_find(transport_name);
f3d01b96 761 if (!transport) {
5a15f70c 762 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 763 transport_name);
c0e31d2e 764 goto notransport;
f3d01b96 765 }
a33c9927 766 if (!try_module_get(transport->owner)) {
5a15f70c 767 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 768 goto notransport;
769 }
a90917c3 770 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 771 if (!chan)
c0e31d2e 772 goto nomem;
4e3c1b9b 773 chan->session = session;
8cdc1a81 774 chan->id = session->priv->free_chan_id++;
3b731ab1 775 chan->ops = &transport->ops;
125b4df4
MD		 776 /*
777 * Note: the channel creation op already writes into the packet
778 * headers. Therefore the "chan" information used as input
779 * should be already accessible.
780 */
4a399b76 781 chan->chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 782 chan, buf_addr, subbuf_size, num_subbuf,
783 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 784 if (!chan->chan)
785 goto create_error;
3c997079 786 chan->tstate = 1;
e64957da 787 chan->enabled = 1;
a33c9927 788 chan->transport = transport;
d83004aa 789 chan->channel_type = channel_type;
8cdc1a81 790 list_add(&chan->list, &session->priv->chan);
4e3c1b9b
MD		 791 mutex_unlock(&sessions_mutex);
792 return chan;
793
f3d01b96
MD		 794create_error:
795 kfree(chan);
c0e31d2e 796nomem:
a33c9927
MD		 797 if (transport)
798 module_put(transport->owner);
c0e31d2e 799notransport:
e5382b6d 800active:
4e3c1b9b
MD		 801 mutex_unlock(&sessions_mutex);
802 return NULL;
803}
804
805/*
d83004aa
JD		 806 * Only used internally at session destruction for per-cpu channels, and
807 * when metadata channel is released.
808 * Needs to be called with sessions mutex held.
4e3c1b9b 809 */
aa7c23a9 810static
a90917c3 811void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 812{
4a399b76 813 chan->ops->priv->channel_destroy(chan->chan);
a33c9927 814 module_put(chan->transport->owner);
4e3c1b9b 815 list_del(&chan->list);
437d5aa5 816 lttng_kernel_destroy_context(chan->ctx);
4e3c1b9b
MD		 817 kfree(chan);
818}
819
d83004aa
JD		 820void lttng_metadata_channel_destroy(struct lttng_channel *chan)
821{
822 BUG_ON(chan->channel_type != METADATA_CHANNEL);
823
824 /* Protect the metadata cache with the sessions_mutex. */
825 mutex_lock(&sessions_mutex);
826 _lttng_channel_destroy(chan);
827 mutex_unlock(&sessions_mutex);
828}
829EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
830
831static
832void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
833{
834 stream->finalized = 1;
835 wake_up_interruptible(&stream->read_wait);
836}
837
a101fa10 838
e5382b6d
MD		 839/*
840 * Supports event creation while tracing session is active.
3c997079 841 * Needs to be called with sessions mutex held.
e5382b6d 842 */
a67ba386 843struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 844 struct lttng_kernel_abi_event *event_param,
437d5aa5 845 const struct lttng_kernel_event_desc *event_desc,
606828e4 846 enum lttng_kernel_abi_instrumentation itype)
4e3c1b9b 847{
8cdc1a81 848 struct lttng_kernel_session *session = chan->session;
a67ba386
MD		 849 struct lttng_kernel_event_recorder *event_recorder;
850 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 851 const char *event_name;
852 struct hlist_head *head;
3d084699 853 int ret;
4e3c1b9b 854
abc0446a 855 if (chan->free_event_id == -1U) {
4cf0bf51 856 ret = -EMFILE;
e5382b6d 857 goto full;
abc0446a 858 }
3c997079
MD		 859
860 switch (itype) {
606828e4 861 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 862 event_name = event_desc->event_name;
3c997079 863 break;
b4a75708 864
606828e4
MD		 865 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
866 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
867 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
868 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 869 event_name = event_param->name;
870 break;
b4a75708 871
606828e4
MD		 872 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
873 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
3c997079
MD		 874 default:
875 WARN_ON_ONCE(1);
876 ret = -EINVAL;
877 goto type_error;
878 }
4a11ef1c 879
8cdc1a81 880 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
4a11ef1c 881 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 882 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
883 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
884 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 885 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 886 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 887 ret = -EEXIST;
888 goto exist;
abc0446a
MD		 889 }
890 }
3c997079 891
a67ba386
MD		 892 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
893 if (!event_recorder) {
4cf0bf51 894 ret = -ENOMEM;
4e3c1b9b 895 goto cache_error;
abc0446a 896 }
a67ba386
MD		 897 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
898 if (!event_recorder_priv) {
899 ret = -ENOMEM;
900 goto cache_private_error;
901 }
902 event_recorder_priv->pub = event_recorder;
903 event_recorder_priv->parent.pub = &event_recorder->parent;
904 event_recorder->priv = event_recorder_priv;
905 event_recorder->parent.priv = &event_recorder_priv->parent;
906 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
907
8a445457 908 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386
MD		 909 event_recorder->chan = chan;
910 event_recorder->priv->id = chan->free_event_id++;
911 event_recorder->priv->parent.instrumentation = itype;
912 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
913 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 914
915 switch (itype) {
606828e4 916 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 917 /* Event will be enabled by enabler sync. */
a67ba386
MD		 918 event_recorder->parent.enabled = 0;
919 event_recorder->priv->parent.registered = 0;
920 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
921 if (!event_recorder->priv->parent.desc) {
4cf0bf51 922 ret = -ENOENT;
d3dbe23c 923 goto register_error;
abc0446a 924 }
3c997079
MD		 925 /* Populate lttng_event structure before event registration. */
926 smp_wmb();
baf20995 927 break;
b4a75708 928
606828e4 929 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 930 /*
931 * Needs to be explicitly enabled after creation, since
932 * we may want to apply filters.
933 */
a67ba386
MD		 934 event_recorder->parent.enabled = 0;
935 event_recorder->priv->parent.registered = 1;
3c997079
MD		 936 /*
937 * Populate lttng_event structure before event
938 * registration.
939 */
940 smp_wmb();
8bf17deb 941 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 942 event_param->u.kprobe.symbol_name,
943 event_param->u.kprobe.offset,
944 event_param->u.kprobe.addr,
a67ba386 945 event_recorder);
abc0446a 946 if (ret) {
4cf0bf51 947 ret = -EINVAL;
d6d808f3 948 goto register_error;
abc0446a 949 }
a67ba386 950 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 951 WARN_ON_ONCE(!ret);
d6d808f3 952 break;
b4a75708 953
606828e4 954 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 955 {
a67ba386
MD		 956 struct lttng_kernel_event_recorder *event_recorder_return;
957 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 958
959 /* kretprobe defines 2 events */
a0493bef
MD		 960 /*
961 * Needs to be explicitly enabled after creation, since
962 * we may want to apply filters.
963 */
a67ba386
MD		 964 event_recorder->parent.enabled = 0;
965 event_recorder->priv->parent.registered = 1;
966
967 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
968 if (!event_recorder_return) {
969 ret = -ENOMEM;
970 goto register_error;
971 }
972 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
973 if (!event_recorder_return_priv) {
974 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 975 ret = -ENOMEM;
7371f44c 976 goto register_error;
abc0446a 977 }
a67ba386
MD		 978 event_recorder_return_priv->pub = event_recorder_return;
979 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
980 event_recorder_return->priv = event_recorder_return_priv;
981 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
982 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
983
8a445457 984 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386
MD		 985 event_recorder_return->chan = chan;
986 event_recorder_return->priv->id = chan->free_event_id++;
987 event_recorder_return->priv->parent.instrumentation = itype;
988 event_recorder_return->parent.enabled = 0;
989 event_recorder_return->priv->parent.registered = 1;
990 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
991 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 992 /*
a90917c3 993 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 994 */
995 smp_wmb();
3c997079 996 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 997 event_param->u.kretprobe.symbol_name,
998 event_param->u.kretprobe.offset,
999 event_param->u.kretprobe.addr,
a67ba386 1000 event_recorder, event_recorder_return);
7371f44c 1001 if (ret) {
a67ba386
MD		 1002 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1003 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1004 ret = -EINVAL;
7371f44c
MD		 1005 goto register_error;
1006 }
1007 /* Take 2 refs on the module: one per event. */
a67ba386 1008 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1009 WARN_ON_ONCE(!ret);
a67ba386 1010 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1011 WARN_ON_ONCE(!ret);
a90917c3 1012 ret = _lttng_event_metadata_statedump(chan->session, chan,
a67ba386 1013 event_recorder_return);
abc0446a 1014 WARN_ON_ONCE(ret > 0);
7371f44c 1015 if (ret) {
a67ba386
MD		 1016 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1017 kmem_cache_free(event_recorder_cache, event_recorder_return);
1018 module_put(event_recorder_return->priv->parent.desc->owner);
1019 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1020 goto statedump_error;
1021 }
8cdc1a81 1022 list_add(&event_recorder_return->priv->node, &chan->session->priv->events);
7371f44c
MD		 1023 break;
1024 }
b4a75708 1025
606828e4 1026 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1027 /*
1028 * Needs to be explicitly enabled after creation, since
1029 * we may want to apply filters.
1030 */
a67ba386
MD		 1031 event_recorder->parent.enabled = 0;
1032 event_recorder->priv->parent.registered = 0;
1033 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1034 switch (event_param->u.syscall.entryexit) {
606828e4 1035 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1036 ret = -EINVAL;
1037 goto register_error;
606828e4 1038 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1039 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1040 break;
606828e4 1041 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1042 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1043 break;
1044 }
1045 switch (event_param->u.syscall.abi) {
606828e4 1046 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1047 ret = -EINVAL;
1048 goto register_error;
606828e4 1049 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1050 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1051 break;
606828e4 1052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1053 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1054 break;
1055 }
a67ba386 1056 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1057 ret = -EINVAL;
259b6cb3 1058 goto register_error;
abc0446a 1059 }
1ec65de1 1060 break;
b4a75708 1061
606828e4 1062 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1063 /*
1064 * Needs to be explicitly enabled after creation, since
1065 * we may want to apply filters.
1066 */
a67ba386
MD		 1067 event_recorder->parent.enabled = 0;
1068 event_recorder->priv->parent.registered = 1;
3aed4dca 1069
a344f64b
FD		 1070 /*
1071 * Populate lttng_event structure before event
1072 * registration.
1073 */
1074 smp_wmb();
149b9a9d 1075
83b802dc 1076 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1077 event_param->u.uprobe.fd,
a67ba386 1078 event_recorder);
149b9a9d
YB		 1079 if (ret)
1080 goto register_error;
a67ba386 1081 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1082 WARN_ON_ONCE(!ret);
1083 break;
b4a75708 1084
606828e4
MD		 1085 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1086 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
baf20995
MD		 1087 default:
1088 WARN_ON_ONCE(1);
4cf0bf51 1089 ret = -EINVAL;
df07930b 1090 goto register_error;
baf20995 1091 }
a67ba386 1092 ret = _lttng_event_metadata_statedump(chan->session, chan, event_recorder);
abc0446a
MD		 1093 WARN_ON_ONCE(ret > 0);
1094 if (ret) {
c099397a 1095 goto statedump_error;
abc0446a 1096 }
a67ba386 1097 hlist_add_head(&event_recorder->priv->hlist, head);
8cdc1a81 1098 list_add(&event_recorder->priv->node, &chan->session->priv->events);
a67ba386 1099 return event_recorder;
4e3c1b9b 1100
c099397a 1101statedump_error:
259b6cb3 1102 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1103register_error:
a67ba386
MD		 1104 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1105cache_private_error:
1106 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1107cache_error:
1108exist:
3c997079 1109type_error:
e5382b6d 1110full:
4cf0bf51 1111 return ERR_PTR(ret);
4e3c1b9b
MD		 1112}
1113
a67ba386 1114struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1115 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1116 uint64_t token, uint64_t error_counter_index,
1117 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1118 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1119 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1120{
a67ba386
MD		 1121 struct lttng_kernel_event_notifier *event_notifier;
1122 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1123 struct lttng_counter *error_counter;
dffef45d
FD		 1124 const char *event_name;
1125 struct hlist_head *head;
1126 int ret;
1127
1128 switch (itype) {
606828e4 1129 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1130 event_name = event_desc->event_name;
b01155ba 1131 break;
b4a75708 1132
606828e4
MD		 1133 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1134 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1135 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1136 event_name = event_notifier_param->event.name;
1137 break;
b4a75708 1138
606828e4
MD		 1139 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1140 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1141 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1142 default:
1143 WARN_ON_ONCE(1);
1144 ret = -EINVAL;
1145 goto type_error;
1146 }
1147
1148 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1149 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1150 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1151 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1152 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1153 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1154 && event_notifier_group == event_notifier_priv->group
1155 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1156 ret = -EEXIST;
1157 goto exist;
1158 }
1159 }
1160
1161 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1162 if (!event_notifier) {
1163 ret = -ENOMEM;
1164 goto cache_error;
1165 }
a67ba386
MD		 1166 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1167 if (!event_notifier_priv) {
1168 ret = -ENOMEM;
1169 goto cache_private_error;
1170 }
1171 event_notifier_priv->pub = event_notifier;
1172 event_notifier_priv->parent.pub = &event_notifier->parent;
1173 event_notifier->priv = event_notifier_priv;
1174 event_notifier->parent.priv = &event_notifier_priv->parent;
1175 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1176
1177 event_notifier->priv->group = event_notifier_group;
1178 event_notifier->priv->parent.user_token = token;
1179 event_notifier->priv->error_counter_index = error_counter_index;
1180 event_notifier->priv->num_captures = 0;
1181 event_notifier->priv->parent.instrumentation = itype;
1182 event_notifier->notification_send = lttng_event_notifier_notification_send;
1183 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1184 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1185 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1186 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1187
1188 switch (itype) {
606828e4 1189 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1190 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1191 event_notifier->parent.enabled = 0;
1192 event_notifier->priv->parent.registered = 0;
1193 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1194 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1195 ret = -ENOENT;
1196 goto register_error;
1197 }
1198 /* Populate lttng_event_notifier structure before event registration. */
1199 smp_wmb();
1200 break;
b4a75708 1201
606828e4 1202 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1203 /*
1204 * Needs to be explicitly enabled after creation, since
1205 * we may want to apply filters.
1206 */
a67ba386
MD		 1207 event_notifier->parent.enabled = 0;
1208 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1209 /*
1210 * Populate lttng_event_notifier structure before event
1211 * registration.
1212 */
1213 smp_wmb();
1214 ret = lttng_kprobes_register_event_notifier(
1215 event_notifier_param->event.u.kprobe.symbol_name,
1216 event_notifier_param->event.u.kprobe.offset,
1217 event_notifier_param->event.u.kprobe.addr,
1218 event_notifier);
1219 if (ret) {
1220 ret = -EINVAL;
1221 goto register_error;
1222 }
a67ba386 1223 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1224 WARN_ON_ONCE(!ret);
1225 break;
b4a75708 1226
606828e4 1227 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1228 /*
1229 * Needs to be explicitly enabled after creation, since
1230 * we may want to apply filters.
1231 */
a67ba386
MD		 1232 event_notifier->parent.enabled = 0;
1233 event_notifier->priv->parent.registered = 0;
1234 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1235 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1236 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1237 ret = -EINVAL;
1238 goto register_error;
606828e4 1239 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1240 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1241 break;
606828e4 1242 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1243 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1244 break;
1245 }
1246 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1247 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1248 ret = -EINVAL;
1249 goto register_error;
606828e4 1250 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1251 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1252 break;
606828e4 1253 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1254 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1255 break;
1256 }
1257
a67ba386 1258 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1259 ret = -EINVAL;
1260 goto register_error;
1261 }
1262 break;
b4a75708 1263
606828e4 1264 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1265 /*
1266 * Needs to be explicitly enabled after creation, since
1267 * we may want to apply filters.
1268 */
a67ba386
MD		 1269 event_notifier->parent.enabled = 0;
1270 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1271
1272 /*
1273 * Populate lttng_event_notifier structure before
1274 * event_notifier registration.
1275 */
1276 smp_wmb();
1277
1278 ret = lttng_uprobes_register_event_notifier(
1279 event_notifier_param->event.name,
1280 event_notifier_param->event.u.uprobe.fd,
1281 event_notifier);
1282 if (ret)
1283 goto register_error;
a67ba386 1284 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1285 WARN_ON_ONCE(!ret);
1286 break;
b4a75708 1287
606828e4
MD		 1288 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1289 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1290 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1291 default:
1292 WARN_ON_ONCE(1);
1293 ret = -EINVAL;
1294 goto register_error;
1295 }
1296
a67ba386
MD		 1297 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1298 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1299
1300 /*
1301 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1302 * bucket is currently in use. We trust it. The session lock
1303 * synchronizes against concurrent creation of the error
1304 * counter.
99f52fcc 1305 */
ab04d7b1
MD		 1306 error_counter = event_notifier_group->error_counter;
1307 if (error_counter) {
99f52fcc
FD		 1308 size_t dimension_index[1];
1309
1310 /*
1311 * Check that the index is within the boundary of the counter.
1312 */
a67ba386 1313 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1314 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1315 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1316 ret = -EINVAL;
1317 goto register_error;
1318 }
1319
a67ba386 1320 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1321 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1322 if (ret) {
1323 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1324 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1325 goto register_error;
1326 }
1327 }
1328
dffef45d
FD		 1329 return event_notifier;
1330
1331register_error:
a67ba386
MD		 1332 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1333cache_private_error:
dffef45d
FD		 1334 kmem_cache_free(event_notifier_cache, event_notifier);
1335cache_error:
1336exist:
1337type_error:
1338 return ERR_PTR(ret);
1339}
1340
99f52fcc
FD		 1341int lttng_kernel_counter_read(struct lttng_counter *counter,
1342 const size_t *dim_indexes, int32_t cpu,
1343 int64_t *val, bool *overflow, bool *underflow)
1344{
1345 return counter->ops->counter_read(counter->counter, dim_indexes,
1346 cpu, val, overflow, underflow);
1347}
1348
1349int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1350 const size_t *dim_indexes, int64_t *val,
1351 bool *overflow, bool *underflow)
1352{
1353 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1354 val, overflow, underflow);
1355}
1356
1357int lttng_kernel_counter_clear(struct lttng_counter *counter,
1358 const size_t *dim_indexes)
1359{
1360 return counter->ops->counter_clear(counter->counter, dim_indexes);
1361}
1362
a67ba386 1363struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan,
606828e4 1364 struct lttng_kernel_abi_event *event_param,
437d5aa5 1365 const struct lttng_kernel_event_desc *event_desc,
606828e4 1366 enum lttng_kernel_abi_instrumentation itype)
3c997079 1367{
a67ba386 1368 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1369
1370 mutex_lock(&sessions_mutex);
a67ba386 1371 event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype);
3c997079
MD		 1372 mutex_unlock(&sessions_mutex);
1373 return event;
1374}
1375
a67ba386 1376struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1377 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1378 uint64_t id, uint64_t error_counter_index,
1379 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1380 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1381 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1382{
a67ba386 1383 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1384
1385 mutex_lock(&sessions_mutex);
1386 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1387 error_counter_index, event_notifier_group,
a67ba386 1388 event_notifier_param, itype);
dffef45d
FD		 1389 mutex_unlock(&sessions_mutex);
1390 return event_notifier;
1391}
1392
3c997079
MD		 1393/* Only used for tracepoints for now. */
1394static
a67ba386 1395void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1396{
437d5aa5 1397 const struct lttng_kernel_event_desc *desc;
f127e61e 1398 int ret = -EINVAL;
3c997079 1399
a67ba386 1400 if (event_recorder->priv->parent.registered)
3c997079 1401 return;
4ecb5ad5 1402
a67ba386
MD		 1403 desc = event_recorder->priv->parent.desc;
1404 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1405 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1406 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
4ecb5ad5 1407 desc->probe_callback,
a67ba386 1408 event_recorder);
4ecb5ad5 1409 break;
b4a75708 1410
606828e4 1411 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1412 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1413 break;
b4a75708 1414
606828e4
MD		 1415 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1416 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1417 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1418 ret = 0;
1419 break;
b4a75708 1420
606828e4
MD		 1421 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1422 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
4ecb5ad5
MD		 1423 default:
1424 WARN_ON_ONCE(1);
1425 }
3c997079 1426 if (!ret)
a67ba386 1427 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1428}
1429
4e3c1b9b
MD		 1430/*
1431 * Only used internally at session destruction.
1432 */
a67ba386 1433int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1434{
a67ba386 1435 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1436 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1437 int ret = -EINVAL;
1438
a67ba386 1439 if (!event_priv->registered)
3c997079
MD		 1440 return 0;
1441
a67ba386
MD		 1442 desc = event_priv->desc;
1443 switch (event_priv->instrumentation) {
606828e4 1444 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386
MD		 1445 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
1446 event_priv->desc->probe_callback,
1447 event_recorder);
baf20995 1448 break;
b4a75708 1449
606828e4 1450 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1451 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1452 ret = 0;
1453 break;
b4a75708 1454
606828e4 1455 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1456 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1457 ret = 0;
1458 break;
b4a75708 1459
606828e4 1460 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1461 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1462 break;
b4a75708 1463
606828e4 1464 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1465 ret = 0;
1466 break;
b4a75708 1467
606828e4 1468 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1469 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1470 ret = 0;
1471 break;
b4a75708 1472
606828e4 1473 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
baf20995
MD		 1474 default:
1475 WARN_ON_ONCE(1);
1476 }
3c997079 1477 if (!ret)
a67ba386 1478 event_priv->registered = 0;
dda6a249
MD		 1479 return ret;
1480}
1481
dffef45d
FD		 1482/* Only used for tracepoints for now. */
1483static
a67ba386 1484void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1485{
437d5aa5 1486 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1487 int ret = -EINVAL;
1488
a67ba386 1489 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1490 return;
1491
a67ba386
MD		 1492 desc = event_notifier->priv->parent.desc;
1493 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1494 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1495 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
e2d5dbc7 1496 desc->probe_callback,
b01155ba
FD		 1497 event_notifier);
1498 break;
b4a75708 1499
606828e4 1500 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1501 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1502 break;
b4a75708 1503
606828e4
MD		 1504 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1505 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1506 ret = 0;
1507 break;
b4a75708 1508
606828e4
MD		 1509 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1510 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1511 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1512 default:
1513 WARN_ON_ONCE(1);
1514 }
1515 if (!ret)
a67ba386 1516 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1517}
1518
1519static
1520int _lttng_event_notifier_unregister(
a67ba386 1521 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1522{
437d5aa5 1523 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1524 int ret = -EINVAL;
1525
a67ba386 1526 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1527 return 0;
1528
a67ba386
MD		 1529 desc = event_notifier->priv->parent.desc;
1530 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1531 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1532 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
e2d5dbc7 1533 event_notifier->priv->parent.desc->probe_callback,
b01155ba
FD		 1534 event_notifier);
1535 break;
b4a75708 1536
606828e4 1537 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1538 lttng_kprobes_unregister_event_notifier(event_notifier);
1539 ret = 0;
1540 break;
b4a75708 1541
606828e4 1542 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1543 lttng_uprobes_unregister_event_notifier(event_notifier);
1544 ret = 0;
1545 break;
b4a75708 1546
606828e4 1547 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1548 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1549 break;
b4a75708 1550
606828e4
MD		 1551 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1552 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1553 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1554 default:
1555 WARN_ON_ONCE(1);
1556 }
1557 if (!ret)
a67ba386 1558 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1559 return ret;
1560}
1561
dda6a249
MD		 1562/*
1563 * Only used internally at session destruction.
1564 */
be066e6c 1565static
0648898e 1566void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1567{
0648898e 1568 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1569 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1570
0648898e
MD		 1571 lttng_free_event_filter_runtime(event);
1572 /* Free event enabler refs */
1573 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1574 &event_priv->enablers_ref_head, node)
1575 kfree(enabler_ref);
b4a75708 1576
0648898e
MD		 1577 switch (event->type) {
1578 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1579 {
1580 struct lttng_kernel_event_recorder *event_recorder =
1581 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1582
0648898e
MD		 1583 switch (event_priv->instrumentation) {
1584 case LTTNG_KERNEL_ABI_TRACEPOINT:
1585 lttng_event_desc_put(event_priv->desc);
1586 break;
b4a75708 1587
0648898e
MD		 1588 case LTTNG_KERNEL_ABI_KPROBE:
1589 module_put(event_priv->desc->owner);
1590 lttng_kprobes_destroy_event_private(event_recorder);
1591 break;
b4a75708 1592
0648898e
MD		 1593 case LTTNG_KERNEL_ABI_KRETPROBE:
1594 module_put(event_priv->desc->owner);
1595 lttng_kretprobes_destroy_private(event_recorder);
1596 break;
b4a75708 1597
0648898e
MD		 1598 case LTTNG_KERNEL_ABI_SYSCALL:
1599 break;
4e3c1b9b 1600
0648898e
MD		 1601 case LTTNG_KERNEL_ABI_UPROBE:
1602 module_put(event_priv->desc->owner);
1603 lttng_uprobes_destroy_event_private(event_recorder);
1604 break;
3ef5cc03 1605
0648898e
MD		 1606 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1607 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1608 default:
1609 WARN_ON_ONCE(1);
1610 }
1611 list_del(&event_recorder->priv->node);
1612 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1613 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1614 break;
0648898e
MD		 1615 }
1616 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1617 {
1618 struct lttng_kernel_event_notifier *event_notifier =
1619 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1620
0648898e
MD		 1621 switch (event_notifier->priv->parent.instrumentation) {
1622 case LTTNG_KERNEL_ABI_TRACEPOINT:
1623 lttng_event_desc_put(event_notifier->priv->parent.desc);
1624 break;
b4a75708 1625
0648898e
MD		 1626 case LTTNG_KERNEL_ABI_KPROBE:
1627 module_put(event_notifier->priv->parent.desc->owner);
1628 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1629 break;
b4a75708 1630
0648898e
MD		 1631 case LTTNG_KERNEL_ABI_SYSCALL:
1632 break;
b4a75708 1633
0648898e
MD		 1634 case LTTNG_KERNEL_ABI_UPROBE:
1635 module_put(event_notifier->priv->parent.desc->owner);
1636 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1637 break;
1638
1639 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1640 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1641 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1642 default:
1643 WARN_ON_ONCE(1);
1644 }
1645 list_del(&event_notifier->priv->node);
1646 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1647 kmem_cache_free(event_notifier_cache, event_notifier);
1648 break;
1649 }
dffef45d
FD		 1650 default:
1651 WARN_ON_ONCE(1);
1652 }
dffef45d
FD		 1653}
1654
8c0393c3 1655struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1656 enum tracker_type tracker_type)
e0130fab 1657{
d1f652f8
MD		 1658 switch (tracker_type) {
1659 case TRACKER_PID:
1660 return &session->pid_tracker;
1661 case TRACKER_VPID:
1662 return &session->vpid_tracker;
1663 case TRACKER_UID:
1664 return &session->uid_tracker;
1665 case TRACKER_VUID:
1666 return &session->vuid_tracker;
1667 case TRACKER_GID:
1668 return &session->gid_tracker;
1669 case TRACKER_VGID:
1670 return &session->vgid_tracker;
1671 default:
1672 WARN_ON_ONCE(1);
1673 return NULL;
1674 }
1675}
1676
8cdc1a81 1677int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1678 enum tracker_type tracker_type, int id)
1679{
8c0393c3 1680 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1681 int ret;
1682
d1f652f8
MD		 1683 tracker = get_tracker(session, tracker_type);
1684 if (!tracker)
1685 return -EINVAL;
1686 if (id < -1)
e0130fab
MD		 1687 return -EINVAL;
1688 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1689 if (id == -1) {
1690 /* track all ids: destroy tracker. */
1691 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1692 ret = 0;
1693 } else {
d1f652f8 1694 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1695 }
e0130fab
MD		 1696 mutex_unlock(&sessions_mutex);
1697 return ret;
1698}
1699
8cdc1a81 1700int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1701 enum tracker_type tracker_type, int id)
e0130fab 1702{
8c0393c3 1703 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1704 int ret;
1705
d1f652f8
MD		 1706 tracker = get_tracker(session, tracker_type);
1707 if (!tracker)
1708 return -EINVAL;
1709 if (id < -1)
e0130fab
MD		 1710 return -EINVAL;
1711 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1712 if (id == -1) {
1713 /* untrack all ids: replace by empty tracker. */
1714 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1715 } else {
d1f652f8 1716 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1717 }
e0130fab
MD		 1718 mutex_unlock(&sessions_mutex);
1719 return ret;
1720}
1721
7e6f9ef6 1722static
d1f652f8 1723void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1724{
8c0393c3
MD		 1725 struct lttng_kernel_id_tracker *id_tracker = m->private;
1726 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1727 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1728 int iter = 0, i;
1729
1730 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1731 if (id_tracker_p) {
1732 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1733 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1734
f934e302 1735 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1736 if (iter++ >= *pos)
1737 return e;
1738 }
1739 }
1740 } else {
d1f652f8 1741 /* ID tracker disabled. */
7e6f9ef6 1742 if (iter >= *pos && iter == 0) {
d1f652f8 1743 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1744 }
1745 iter++;
1746 }
1747 /* End of list */
1748 return NULL;
1749}
1750
1751/* Called with sessions_mutex held. */
1752static
d1f652f8 1753void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1754{
8c0393c3
MD		 1755 struct lttng_kernel_id_tracker *id_tracker = m->private;
1756 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1757 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1758 int iter = 0, i;
1759
1760 (*ppos)++;
d1f652f8
MD		 1761 if (id_tracker_p) {
1762 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1763 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1764
f934e302 1765 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1766 if (iter++ >= *ppos)
1767 return e;
1768 }
1769 }
1770 } else {
d1f652f8 1771 /* ID tracker disabled. */
7e6f9ef6 1772 if (iter >= *ppos && iter == 0)
d1f652f8 1773 return p; /* empty tracker */
7e6f9ef6
MD		 1774 iter++;
1775 }
1776
1777 /* End of list */
1778 return NULL;
1779}
1780
1781static
d1f652f8 1782void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1783{
1784 mutex_unlock(&sessions_mutex);
1785}
1786
1787static
d1f652f8 1788int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1789{
8c0393c3
MD		 1790 struct lttng_kernel_id_tracker *id_tracker = m->private;
1791 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1792 int id;
7e6f9ef6 1793
d1f652f8 1794 if (p == id_tracker_p) {
7e6f9ef6 1795 /* Tracker disabled. */
d1f652f8 1796 id = -1;
7e6f9ef6 1797 } else {
d1f652f8 1798 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1799
d1f652f8
MD		 1800 id = lttng_id_tracker_get_node_id(e);
1801 }
8c0393c3 1802 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1803 case TRACKER_PID:
1804 seq_printf(m, "process { pid = %d; };\n", id);
1805 break;
1806 case TRACKER_VPID:
1807 seq_printf(m, "process { vpid = %d; };\n", id);
1808 break;
1809 case TRACKER_UID:
1810 seq_printf(m, "user { uid = %d; };\n", id);
1811 break;
1812 case TRACKER_VUID:
1813 seq_printf(m, "user { vuid = %d; };\n", id);
1814 break;
1815 case TRACKER_GID:
1816 seq_printf(m, "group { gid = %d; };\n", id);
1817 break;
1818 case TRACKER_VGID:
1819 seq_printf(m, "group { vgid = %d; };\n", id);
1820 break;
1821 default:
1822 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1823 }
7e6f9ef6
MD		 1824 return 0;
1825}
1826
1827static
d1f652f8
MD		 1828const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1829 .start = id_list_start,
1830 .next = id_list_next,
1831 .stop = id_list_stop,
1832 .show = id_list_show,
7e6f9ef6
MD		 1833};
1834
1835static
d1f652f8 1836int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1837{
d1f652f8 1838 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1839}
1840
1841static
d1f652f8 1842int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1843{
1844 struct seq_file *m = file->private_data;
8c0393c3 1845 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1846 int ret;
1847
d1f652f8 1848 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1849 ret = seq_release(inode, file);
d1f652f8 1850 if (!ret)
8c0393c3 1851 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1852 return ret;
1853}
1854
d1f652f8 1855const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1856 .owner = THIS_MODULE,
d1f652f8 1857 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1858 .read = seq_read,
1859 .llseek = seq_lseek,
d1f652f8 1860 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1861};
1862
8cdc1a81 1863int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1864 enum tracker_type tracker_type)
7e6f9ef6 1865{
d1f652f8 1866 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1867 struct seq_file *m;
1868 int file_fd, ret;
1869
1870 file_fd = lttng_get_unused_fd();
1871 if (file_fd < 0) {
1872 ret = file_fd;
1873 goto fd_error;
1874 }
1875
d1f652f8
MD		 1876 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1877 &lttng_tracker_ids_list_fops,
7e6f9ef6 1878 NULL, O_RDWR);
d1f652f8
MD		 1879 if (IS_ERR(tracker_ids_list_file)) {
1880 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1881 goto file_error;
1882 }
8cdc1a81 1883 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1884 ret = -EOVERFLOW;
9c1f4643
MD		 1885 goto refcount_error;
1886 }
d1f652f8 1887 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1888 if (ret < 0)
1889 goto open_error;
d1f652f8
MD		 1890 m = tracker_ids_list_file->private_data;
1891
1892 m->private = get_tracker(session, tracker_type);
1893 BUG_ON(!m->private);
1894 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1895
1896 return file_fd;
1897
1898open_error:
8cdc1a81 1899 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1900refcount_error:
d1f652f8 1901 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1902file_error:
1903 put_unused_fd(file_fd);
1904fd_error:
1905 return ret;
1906}
1907
3c997079
MD		 1908/*
1909 * Enabler management.
1910 */
1911static
4993071a
PP		 1912int lttng_match_enabler_star_glob(const char *desc_name,
1913 const char *pattern)
3c997079 1914{
cbc19040
MD		 1915 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1916 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1917 return 0;
1918 return 1;
1919}
1920
1921static
4ecb5ad5
MD		 1922int lttng_match_enabler_name(const char *desc_name,
1923 const char *name)
3c997079 1924{
4ecb5ad5 1925 if (strcmp(desc_name, name))
3c997079
MD		 1926 return 0;
1927 return 1;
1928}
1929
437d5aa5 1930int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
3c997079
MD		 1931 struct lttng_enabler *enabler)
1932{
4ecb5ad5 1933 const char *desc_name, *enabler_name;
badfe9f5 1934 bool compat = false, entry = false;
4ecb5ad5
MD		 1935
1936 enabler_name = enabler->event_param.name;
1937 switch (enabler->event_param.instrumentation) {
606828e4 1938 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1939 desc_name = desc->event_name;
3b861b22
FD		 1940 switch (enabler->format_type) {
1941 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1942 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1943 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1944 return lttng_match_enabler_name(desc_name, enabler_name);
1945 default:
1946 return -EINVAL;
1947 }
4ecb5ad5 1948 break;
b4a75708 1949
606828e4 1950 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1951 desc_name = desc->event_name;
badfe9f5 1952 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1953 desc_name += strlen("compat_");
badfe9f5
MD		 1954 compat = true;
1955 }
4ecb5ad5
MD		 1956 if (!strncmp(desc_name, "syscall_exit_",
1957 strlen("syscall_exit_"))) {
1958 desc_name += strlen("syscall_exit_");
1959 } else if (!strncmp(desc_name, "syscall_entry_",
1960 strlen("syscall_entry_"))) {
1961 desc_name += strlen("syscall_entry_");
badfe9f5 1962 entry = true;
4ecb5ad5
MD		 1963 } else {
1964 WARN_ON_ONCE(1);
1965 return -EINVAL;
1966 }
badfe9f5 1967 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1968 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1969 break;
606828e4 1970 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1971 if (!entry)
1972 return 0;
1973 break;
606828e4 1974 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1975 if (entry)
1976 return 0;
1977 break;
1978 default:
1979 return -EINVAL;
1980 }
1981 switch (enabler->event_param.u.syscall.abi) {
606828e4 1982 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1983 break;
606828e4 1984 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1985 if (compat)
1986 return 0;
1987 break;
606828e4 1988 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1989 if (!compat)
1990 return 0;
1991 break;
1992 default:
1993 return -EINVAL;
1994 }
1995 switch (enabler->event_param.u.syscall.match) {
606828e4 1996 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1997 switch (enabler->format_type) {
1998 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1999 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2000 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2001 return lttng_match_enabler_name(desc_name, enabler_name);
2002 default:
2003 return -EINVAL;
2004 }
2005 break;
606828e4 2006 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2007 return -EINVAL; /* Not implemented. */
2008 default:
2009 return -EINVAL;
2010 }
4ecb5ad5 2011 break;
b4a75708 2012
4ecb5ad5
MD		 2013 default:
2014 WARN_ON_ONCE(1);
2015 return -EINVAL;
2016 }
3c997079
MD		 2017}
2018
2019static
b2bc0bc8 2020int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2021 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2022{
b2bc0bc8
FD		 2023 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
2024 event_enabler);
2025
a67ba386 2026 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2027 return 0;
a67ba386
MD		 2028 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2029 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2030 return 1;
2031 else
2032 return 0;
2033}
2034
b01155ba
FD		 2035static
2036int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2037 struct lttng_kernel_event_notifier *event_notifier)
b01155ba
FD		 2038{
2039 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
2040 event_notifier_enabler);
2041
a67ba386 2042 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2043 return 0;
a67ba386
MD		 2044 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2045 && event_notifier->priv->group == event_notifier_enabler->group
2046 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2047 return 1;
2048 else
2049 return 0;
2050}
2051
3c997079 2052static
b2bc0bc8
FD		 2053struct lttng_enabler_ref *lttng_enabler_ref(
2054 struct list_head *enablers_ref_list,
3c997079
MD		 2055 struct lttng_enabler *enabler)
2056{
2057 struct lttng_enabler_ref *enabler_ref;
2058
b2bc0bc8 2059 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2060 if (enabler_ref->ref == enabler)
2061 return enabler_ref;
2062 }
2063 return NULL;
2064}
2065
3c997079 2066static
1b917d6b 2067void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2068{
8cdc1a81 2069 struct lttng_kernel_session *session = event_enabler->chan->session;
437d5aa5
MD		 2070 struct lttng_kernel_probe_desc *probe_desc;
2071 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2072 int i;
2073 struct list_head *probe_list;
2074
2075 probe_list = lttng_get_probe_list_head();
2076 /*
2077 * For each probe event, if we find that a probe event matches
2078 * our enabler, create an associated lttng_event if not
2079 * already present.
2080 */
2081 list_for_each_entry(probe_desc, probe_list, head) {
2082 for (i = 0; i < probe_desc->nr_events; i++) {
2083 int found = 0;
2084 struct hlist_head *head;
a67ba386
MD		 2085 struct lttng_kernel_event_recorder_private *event_recorder_private;
2086 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2087
2088 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2089 if (!lttng_desc_match_enabler(desc,
2090 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2091 continue;
3c997079
MD		 2092
2093 /*
2094 * Check if already created.
2095 */
4a11ef1c 2096 head = utils_borrow_hash_table_bucket(
8cdc1a81 2097 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2098 desc->event_name);
a67ba386
MD		 2099 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2100 if (event_recorder_private->parent.desc == desc
2101 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2102 found = 1;
2103 }
2104 if (found)
2105 continue;
2106
2107 /*
2108 * We need to create an event for this
2109 * event probe.
2110 */
a67ba386
MD		 2111 event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan,
2112 NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT);
2113 if (!event_recorder) {
5a15f70c 2114 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2115 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2116 }
2117 }
2118 }
2119}
2120
b01155ba
FD		 2121static
2122void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2123{
2124 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2125 struct lttng_kernel_probe_desc *probe_desc;
2126 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2127 int i;
2128 struct list_head *probe_list;
2129
2130 probe_list = lttng_get_probe_list_head();
2131 /*
2132 * For each probe event, if we find that a probe event matches
2133 * our enabler, create an associated lttng_event_notifier if not
2134 * already present.
2135 */
2136 list_for_each_entry(probe_desc, probe_list, head) {
2137 for (i = 0; i < probe_desc->nr_events; i++) {
2138 int found = 0;
2139 struct hlist_head *head;
a67ba386
MD		 2140 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2141 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2142
2143 desc = probe_desc->event_desc[i];
2144 if (!lttng_desc_match_enabler(desc,
2145 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2146 continue;
2147
2148 /*
2149 * Check if already created.
2150 */
2151 head = utils_borrow_hash_table_bucket(
2152 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2153 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2154 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2155 if (event_notifier_priv->parent.desc == desc
2156 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2157 found = 1;
2158 }
2159 if (found)
2160 continue;
2161
2162 /*
2163 * We need to create a event_notifier for this event probe.
2164 */
2165 event_notifier = _lttng_event_notifier_create(desc,
2166 event_notifier_enabler->base.user_token,
99f52fcc 2167 event_notifier_enabler->error_counter_index,
a67ba386 2168 event_notifier_group, NULL,
606828e4 2169 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2170 if (IS_ERR(event_notifier)) {
2171 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2172 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2173 }
2174 }
2175 }
2176}
2177
33a39a3c 2178static
1b917d6b 2179void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2180{
2181 int ret;
2182
a67ba386 2183 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2184 WARN_ON_ONCE(ret);
2185}
2186
8a8ac9a8
FD		 2187static
2188void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2189{
2190 int ret;
2191
a67ba386 2192 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2193 WARN_ON_ONCE(ret);
a67ba386 2194 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2195 WARN_ON_ONCE(ret);
2196}
2197
33a39a3c 2198/*
a67ba386 2199 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2200 * tracepoint probes.
2201 * Should be called with sessions mutex held.
2202 */
2203static
b2bc0bc8 2204void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2205{
b2bc0bc8 2206 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2207 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2208 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2209 break;
b4a75708 2210
606828e4 2211 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2212 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2213 break;
b4a75708 2214
33a39a3c
MD		 2215 default:
2216 WARN_ON_ONCE(1);
2217 break;
2218 }
2219}
2220
3c997079 2221/*
b2bc0bc8 2222 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2223 * and add backward reference from the event to the enabler.
2224 * Should be called with sessions mutex held.
2225 */
2226static
b2bc0bc8 2227int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2228{
b2bc0bc8 2229 struct lttng_channel *chan = event_enabler->chan;
8cdc1a81 2230 struct lttng_kernel_session *session = event_enabler->chan->session;
b2bc0bc8 2231 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2232 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2233
606828e4
MD		 2234 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2235 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2236 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2237 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2238 int enabled = base_enabler->enabled;
606828e4 2239 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2240
606828e4 2241 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1
MD		 2242 WRITE_ONCE(chan->syscall_all_entry, enabled);
2243
606828e4 2244 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
3b82c4e1 2245 WRITE_ONCE(chan->syscall_all_exit, enabled);
badfe9f5
MD		 2246 }
2247
3c997079 2248 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2249 lttng_create_event_if_missing(event_enabler);
3c997079 2250
b2bc0bc8 2251 /* For each event matching event_enabler in session event list. */
8cdc1a81 2252 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2253 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2254 struct lttng_enabler_ref *enabler_ref;
2255
a67ba386 2256 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2257 continue;
a67ba386 2258 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2259 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2260 if (!enabler_ref) {
2261 /*
2262 * If no backward ref, create it.
b2bc0bc8 2263 * Add backward ref from event to event_enabler.
3c997079
MD		 2264 */
2265 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2266 if (!enabler_ref)
2267 return -ENOMEM;
b2bc0bc8 2268 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2269 list_add(&enabler_ref->node,
a67ba386 2270 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2271 }
2272
f127e61e
MD		 2273 /*
2274 * Link filter bytecodes if not linked yet.
2275 */
a67ba386 2276 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2277 lttng_static_ctx,
a67ba386 2278 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2279 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2280 }
2281 return 0;
2282}
2283
b01155ba 2284/*
a67ba386 2285 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2286 * tracepoint probes.
2287 * Should be called with sessions mutex held.
2288 */
2289static
2290void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2291{
2292 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2293 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2294 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2295 break;
b4a75708 2296
606828e4 2297 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2298 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2299 break;
b4a75708 2300
b01155ba
FD		 2301 default:
2302 WARN_ON_ONCE(1);
2303 break;
2304 }
2305}
2306
2307/*
2308 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2309 */
2310static
8a8ac9a8
FD		 2311int lttng_event_notifier_enabler_ref_event_notifiers(
2312 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2313{
2314 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2315 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2316 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2317
606828e4
MD		 2318 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2319 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2320 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2321 !strcmp(base_enabler->event_param.name, "*")) {
2322
2323 int enabled = base_enabler->enabled;
606828e4 2324 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2325
606828e4 2326 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2327 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2328
606828e4 2329 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2330 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2331
2332 }
2333
b01155ba
FD		 2334 /* First ensure that probe event_notifiers are created for this enabler. */
2335 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2336
2337 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2338 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2339 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2340 struct lttng_enabler_ref *enabler_ref;
2341
2342 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2343 continue;
2344
a67ba386 2345 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2346 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2347 if (!enabler_ref) {
2348 /*
2349 * If no backward ref, create it.
2350 * Add backward ref from event_notifier to enabler.
2351 */
2352 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2353 if (!enabler_ref)
2354 return -ENOMEM;
2355
2356 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2357 event_notifier_enabler);
2358 list_add(&enabler_ref->node,
a67ba386 2359 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2360 }
2361
2362 /*
2363 * Link filter bytecodes if not linked yet.
2364 */
a67ba386
MD		 2365 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2366 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2367 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2368
2369 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2370 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2371 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2372 &event_notifier_enabler->capture_bytecode_head);
2373
a67ba386 2374 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2375 }
2376 return 0;
2377}
2378
3c997079
MD		 2379/*
2380 * Called at module load: connect the probe on all enablers matching
2381 * this event.
2382 * Called with sessions lock held.
2383 */
2384int lttng_fix_pending_events(void)
2385{
8cdc1a81 2386 struct lttng_kernel_session_private *session_priv;
3c997079 2387
8cdc1a81
MD		 2388 list_for_each_entry(session_priv, &sessions, list)
2389 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2390 return 0;
2391}
2392
b01155ba
FD		 2393static bool lttng_event_notifier_group_has_active_event_notifiers(
2394 struct lttng_event_notifier_group *event_notifier_group)
2395{
2396 struct lttng_event_notifier_enabler *event_notifier_enabler;
2397
2398 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2399 node) {
2400 if (event_notifier_enabler->base.enabled)
2401 return true;
2402 }
2403 return false;
2404}
2405
2406bool lttng_event_notifier_active(void)
2407{
2408 struct lttng_event_notifier_group *event_notifier_group;
2409
2410 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2411 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2412 return true;
2413 }
2414 return false;
2415}
2416
2417int lttng_fix_pending_event_notifiers(void)
2418{
2419 struct lttng_event_notifier_group *event_notifier_group;
2420
2421 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2422 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2423 return 0;
2424}
2425
b2bc0bc8
FD		 2426struct lttng_event_enabler *lttng_event_enabler_create(
2427 enum lttng_enabler_format_type format_type,
606828e4 2428 struct lttng_kernel_abi_event *event_param,
3c997079
MD		 2429 struct lttng_channel *chan)
2430{
b2bc0bc8 2431 struct lttng_event_enabler *event_enabler;
3c997079 2432
b2bc0bc8
FD		 2433 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2434 if (!event_enabler)
3c997079 2435 return NULL;
b2bc0bc8
FD		 2436 event_enabler->base.format_type = format_type;
2437 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2438 memcpy(&event_enabler->base.event_param, event_param,
2439 sizeof(event_enabler->base.event_param));
2440 event_enabler->chan = chan;
3c997079 2441 /* ctx left NULL */
b2bc0bc8 2442 event_enabler->base.enabled = 0;
3c997079 2443 mutex_lock(&sessions_mutex);
8cdc1a81 2444 list_add(&event_enabler->node, &event_enabler->chan->session->priv->enablers_head);
b2bc0bc8 2445 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2446 mutex_unlock(&sessions_mutex);
b2bc0bc8 2447 return event_enabler;
3c997079
MD		 2448}
2449
b2bc0bc8 2450int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2451{
2452 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2453 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2454 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2455 mutex_unlock(&sessions_mutex);
2456 return 0;
2457}
2458
b2bc0bc8 2459int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2460{
2461 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2462 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2463 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2464 mutex_unlock(&sessions_mutex);
2465 return 0;
2466}
2467
b2bc0bc8 2468static
183e8b3a 2469int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
606828e4 2470 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2471{
d64ca521 2472 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2473 uint32_t bytecode_len;
2474 int ret;
2475
2476 ret = get_user(bytecode_len, &bytecode->len);
2477 if (ret)
2478 return ret;
52cfcdf3 2479 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2480 GFP_KERNEL);
2481 if (!bytecode_node)
2482 return -ENOMEM;
2483 ret = copy_from_user(&bytecode_node->bc, bytecode,
2484 sizeof(*bytecode) + bytecode_len);
2485 if (ret)
2486 goto error_free;
b2bc0bc8 2487
8a445457 2488 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2489 bytecode_node->enabler = enabler;
2490 /* Enforce length based on allocated size */
2491 bytecode_node->bc.len = bytecode_len;
2492 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2493
07dfc1d0
MD		 2494 return 0;
2495
2496error_free:
52cfcdf3 2497 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2498 return ret;
2499}
2500
183e8b3a 2501int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2502 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2503{
2504 int ret;
183e8b3a 2505 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2506 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2507 if (ret)
2508 goto error;
2509
2510 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2511 return 0;
2512
2513error:
2514 return ret;
2515}
2516
e2d5dbc7 2517int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2518 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2519{
2520
e2d5dbc7 2521 switch (event->priv->instrumentation) {
606828e4 2522 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2523 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2524 default:
2525 return -EINVAL;
2526 }
2527}
2528
3c997079
MD		 2529static
2530void lttng_enabler_destroy(struct lttng_enabler *enabler)
2531{
d64ca521 2532 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2533
2534 /* Destroy filter bytecode */
2535 list_for_each_entry_safe(filter_node, tmp_filter_node,
2536 &enabler->filter_bytecode_head, node) {
52cfcdf3 2537 lttng_kvfree(filter_node);
07dfc1d0 2538 }
b2bc0bc8
FD		 2539}
2540
2541static
2542void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2543{
2544 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2545
b2bc0bc8
FD		 2546 list_del(&event_enabler->node);
2547 kfree(event_enabler);
3c997079
MD		 2548}
2549
dffef45d
FD		 2550struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2551 struct lttng_event_notifier_group *event_notifier_group,
2552 enum lttng_enabler_format_type format_type,
606828e4 2553 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2554{
2555 struct lttng_event_notifier_enabler *event_notifier_enabler;
2556
2557 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2558 if (!event_notifier_enabler)
2559 return NULL;
2560
2561 event_notifier_enabler->base.format_type = format_type;
2562 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2563 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2564
99f52fcc 2565 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2566 event_notifier_enabler->num_captures = 0;
dffef45d 2567
8a8ac9a8
FD		 2568 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2569 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2570
2571 event_notifier_enabler->base.enabled = 0;
2572 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2573 event_notifier_enabler->group = event_notifier_group;
2574
2575 mutex_lock(&sessions_mutex);
2576 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2577 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2578
2579 mutex_unlock(&sessions_mutex);
2580
2581 return event_notifier_enabler;
2582}
2583
2584int lttng_event_notifier_enabler_enable(
2585 struct lttng_event_notifier_enabler *event_notifier_enabler)
2586{
2587 mutex_lock(&sessions_mutex);
2588 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2589 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2590 mutex_unlock(&sessions_mutex);
2591 return 0;
2592}
2593
2594int lttng_event_notifier_enabler_disable(
2595 struct lttng_event_notifier_enabler *event_notifier_enabler)
2596{
2597 mutex_lock(&sessions_mutex);
2598 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2599 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2600 mutex_unlock(&sessions_mutex);
2601 return 0;
2602}
2603
183e8b3a 2604int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2605 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2606 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2607{
2608 int ret;
2609
183e8b3a 2610 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2611 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2612 bytecode);
2613 if (ret)
2614 goto error;
2615
b01155ba 2616 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2617 return 0;
2618
2619error:
2620 return ret;
2621}
2622
99d223ad
FD		 2623int lttng_event_notifier_enabler_attach_capture_bytecode(
2624 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2625 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2626{
d64ca521 2627 struct lttng_kernel_bytecode_node *bytecode_node;
99d223ad
FD		 2628 struct lttng_enabler *enabler =
2629 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2630 uint32_t bytecode_len;
2631 int ret;
2632
2633 ret = get_user(bytecode_len, &bytecode->len);
2634 if (ret)
2635 return ret;
2636
2637 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2638 GFP_KERNEL);
2639 if (!bytecode_node)
2640 return -ENOMEM;
2641
2642 ret = copy_from_user(&bytecode_node->bc, bytecode,
2643 sizeof(*bytecode) + bytecode_len);
2644 if (ret)
2645 goto error_free;
2646
8a445457 2647 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2648 bytecode_node->enabler = enabler;
2649
2650 /* Enforce length based on allocated size */
2651 bytecode_node->bc.len = bytecode_len;
2652 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2653
2654 event_notifier_enabler->num_captures++;
2655
2656 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2657 goto end;
2658
2659error_free:
2660 lttng_kvfree(bytecode_node);
2661end:
2662 return ret;
2663}
2664
dffef45d
FD		 2665static
2666void lttng_event_notifier_enabler_destroy(
2667 struct lttng_event_notifier_enabler *event_notifier_enabler)
2668{
2669 if (!event_notifier_enabler) {
2670 return;
2671 }
2672
2673 list_del(&event_notifier_enabler->node);
2674
2675 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2676 kfree(event_notifier_enabler);
2677}
2678
3c997079 2679/*
b2bc0bc8 2680 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2681 * session.
2682 * Should be called with sessions mutex held.
2683 */
2684static
8cdc1a81 2685void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2686{
b2bc0bc8 2687 struct lttng_event_enabler *event_enabler;
a67ba386 2688 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2689
8cdc1a81 2690 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2691 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2692 /*
2693 * For each event, if at least one of its enablers is enabled,
2694 * and its channel and session transient states are enabled, we
2695 * enable the event, else we disable it.
2696 */
8cdc1a81 2697 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2698 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2699 struct lttng_enabler_ref *enabler_ref;
218585b9 2700 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2701 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2702 int nr_filters = 0;
3c997079 2703
a67ba386 2704 switch (event_recorder_priv->parent.instrumentation) {
606828e4
MD		 2705 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2706 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2707 /* Enable events */
2708 list_for_each_entry(enabler_ref,
a67ba386 2709 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2710 if (enabler_ref->ref->enabled) {
2711 enabled = 1;
2712 break;
2713 }
2714 }
4ecb5ad5 2715 break;
b4a75708 2716
4ecb5ad5 2717 default:
3c997079
MD		 2718 /* Not handled with lazy sync. */
2719 continue;
2720 }
2721 /*
2722 * Enabled state is based on union of enablers, with
2723 * intesection of session and channel transient enable
2724 * states.
2725 */
8cdc1a81 2726 enabled = enabled && session->priv->tstate && event_recorder->chan->tstate;
3c997079 2727
a67ba386 2728 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2729 /*
2730 * Sync tracepoint registration with event enabled
2731 * state.
2732 */
2733 if (enabled) {
a67ba386 2734 register_event(event_recorder);
3c997079 2735 } else {
a67ba386 2736 _lttng_event_unregister(event_recorder);
3c997079 2737 }
07dfc1d0
MD		 2738
2739 /* Check if has enablers without bytecode enabled */
2740 list_for_each_entry(enabler_ref,
a67ba386 2741 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2742 if (enabler_ref->ref->enabled
2743 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2744 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2745 break;
2746 }
2747 }
a67ba386 2748 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2749 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2750
2751 /* Enable filters */
2752 list_for_each_entry(runtime,
e2d5dbc7 2753 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2754 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2755 nr_filters++;
2756 }
2757 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2758 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2759 }
2760}
2761
2762/*
2763 * Apply enablers to session events, adding events to session if need
2764 * be. It is required after each modification applied to an active
2765 * session, and right before session "start".
2766 * "lazy" sync means we only sync if required.
2767 * Should be called with sessions mutex held.
2768 */
2769static
8cdc1a81 2770void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2771{
2772 /* We can skip if session is not active */
2773 if (!session->active)
2774 return;
b2bc0bc8 2775 lttng_session_sync_event_enablers(session);
3c997079
MD		 2776}
2777
b01155ba
FD		 2778static
2779void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2780{
2781 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2782 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2783
2784 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2785 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2786
2787 /*
2788 * For each event_notifier, if at least one of its enablers is enabled,
2789 * we enable the event_notifier, else we disable it.
2790 */
a67ba386
MD		 2791 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2792 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2793 struct lttng_enabler_ref *enabler_ref;
218585b9 2794 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2795 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2796 int nr_filters = 0, nr_captures = 0;
b01155ba 2797
a67ba386 2798 switch (event_notifier_priv->parent.instrumentation) {
606828e4
MD		 2799 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2800 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2801 /* Enable event_notifiers */
2802 list_for_each_entry(enabler_ref,
a67ba386 2803 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2804 if (enabler_ref->ref->enabled) {
2805 enabled = 1;
2806 break;
2807 }
2808 }
2809 break;
b4a75708 2810
b01155ba
FD		 2811 default:
2812 /* Not handled with sync. */
2813 continue;
2814 }
2815
a67ba386 2816 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2817 /*
2818 * Sync tracepoint registration with event_notifier enabled
2819 * state.
2820 */
2821 if (enabled) {
a67ba386 2822 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2823 register_event_notifier(event_notifier);
2824 } else {
a67ba386 2825 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2826 _lttng_event_notifier_unregister(event_notifier);
2827 }
2828
2829 /* Check if has enablers without bytecode enabled */
2830 list_for_each_entry(enabler_ref,
a67ba386 2831 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2832 if (enabler_ref->ref->enabled
2833 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2834 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2835 break;
2836 }
2837 }
a67ba386 2838 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2839 has_enablers_without_filter_bytecode;
b01155ba
FD		 2840
2841 /* Enable filters */
2842 list_for_each_entry(runtime,
e2d5dbc7 2843 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2844 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2845 nr_filters++;
2846 }
2847 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2848 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2849
2850 /* Enable captures */
2851 list_for_each_entry(runtime,
e2d5dbc7 2852 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2853 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2854 nr_captures++;
2855 }
2856 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2857 }
2858}
2859
1ec3f75a 2860/*
d83004aa
JD		 2861 * Serialize at most one packet worth of metadata into a metadata
2862 * channel.
92d9f5e6
MD		 2863 * We grab the metadata cache mutex to get exclusive access to our metadata
2864 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2865 * allows us to do racy operations such as looking for remaining space left in
2866 * packet and write, since mutual exclusion protects us from concurrent writes.
2867 * Mutual exclusion on the metadata cache allow us to read the cache content
2868 * without racing against reallocation of the cache by updates.
35097f36
JD		 2869 * Returns the number of bytes written in the channel, 0 if no data
2870 * was written and a negative value on error.
1ec3f75a 2871 */
b3b8072b 2872int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2873 struct channel *chan, bool *coherent)
d83004aa 2874{
8a57ec02 2875 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2876 int ret = 0;
2877 size_t len, reserve_len;
2878
f613e3e6 2879 /*
92d9f5e6
MD		 2880 * Ensure we support mutiple get_next / put sequences followed by
2881 * put_next. The metadata cache lock protects reading the metadata
2882 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2883 * "flush" operations on the buffer invoked by different processes.
2884 * Moreover, since the metadata cache memory can be reallocated, we
2885 * need to have exclusive access against updates even though we only
2886 * read it.
f613e3e6 2887 */
92d9f5e6 2888 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2889 WARN_ON(stream->metadata_in < stream->metadata_out);
2890 if (stream->metadata_in != stream->metadata_out)
de23d59d 2891 goto end;
f613e3e6 2892
9616f0bf
JD		 2893 /* Metadata regenerated, change the version. */
2894 if (stream->metadata_cache->version != stream->version)
2895 stream->version = stream->metadata_cache->version;
2896
d83004aa 2897 len = stream->metadata_cache->metadata_written -
f613e3e6 2898 stream->metadata_in;
9de2c215 2899 if (!len)
de23d59d 2900 goto end;
d83004aa 2901 reserve_len = min_t(size_t,
4a399b76 2902 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2903 len);
a775608d 2904 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2905 sizeof(char), NULL);
d83004aa
JD		 2906 /*
2907 * If reservation failed, return an error to the caller.
2908 */
c2fb9c1c 2909 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2910 if (ret != 0) {
2911 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2912 stream->coherent = false;
d83004aa
JD		 2913 goto end;
2914 }
b3b8072b 2915 stream->transport->ops.event_write(&ctx,
f613e3e6 2916 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2917 reserve_len);
b3b8072b 2918 stream->transport->ops.event_commit(&ctx);
f613e3e6 2919 stream->metadata_in += reserve_len;
3e75e2a7 2920 if (reserve_len < len)
8b97fd42
MD		 2921 stream->coherent = false;
2922 else
2923 stream->coherent = true;
d83004aa
JD		 2924 ret = reserve_len;
2925
2926end:
8b97fd42
MD		 2927 if (coherent)
2928 *coherent = stream->coherent;
92d9f5e6 2929 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2930 return ret;
2931}
2932
8b97fd42 2933static
8cdc1a81 2934void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2935{
8cdc1a81
MD		 2936 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2937 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2938}
2939
2940static
8cdc1a81 2941void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2942{
8cdc1a81
MD		 2943 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2944 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2945 struct lttng_metadata_stream *stream;
2946
8cdc1a81 2947 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2948 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2949 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2950 }
8b97fd42
MD		 2951}
2952
d83004aa
JD		 2953/*
2954 * Write the metadata to the metadata cache.
2955 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2956 * The metadata cache lock protects us from concurrent read access from
2957 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2958 * The content of the printf is printed as a single atomic metadata
2959 * transaction.
d83004aa 2960 */
8cdc1a81 2961int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2962 const char *fmt, ...)
2963{
c099397a 2964 char *str;
d83004aa 2965 size_t len;
c099397a
MD		 2966 va_list ap;
2967
585e5dcc 2968 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2969
2970 va_start(ap, fmt);
2971 str = kvasprintf(GFP_KERNEL, fmt, ap);
2972 va_end(ap);
2973 if (!str)
2974 return -ENOMEM;
2975
1ec3f75a 2976 len = strlen(str);
8cdc1a81
MD		 2977 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2978 if (session->priv->metadata_cache->metadata_written + len >
2979 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2980 char *tmp_cache_realloc;
2981 unsigned int tmp_cache_alloc_size;
2982
2983 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2984 session->priv->metadata_cache->cache_alloc + len,
2985 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2986 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2987 if (!tmp_cache_realloc)
2988 goto err;
8cdc1a81 2989 if (session->priv->metadata_cache->data) {
a606b6e8 2990 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 2991 session->priv->metadata_cache->data,
2992 session->priv->metadata_cache->cache_alloc);
2993 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 2994 }
2995
8cdc1a81
MD		 2996 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2997 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 2998 }
8cdc1a81
MD		 2999 memcpy(session->priv->metadata_cache->data +
3000 session->priv->metadata_cache->metadata_written,
d83004aa 3001 str, len);
8cdc1a81 3002 session->priv->metadata_cache->metadata_written += len;
c099397a 3003 kfree(str);
d83004aa 3004
d83004aa
JD		 3005 return 0;
3006
3007err:
3008 kfree(str);
3009 return -ENOMEM;
c099397a
MD		 3010}
3011
f513b2bf 3012static
8cdc1a81 3013int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3014{
3015 size_t i;
3016
3017 for (i = 0; i < nesting; i++) {
3018 int ret;
3019
3020 ret = lttng_metadata_printf(session, " ");
3021 if (ret) {
3022 return ret;
3023 }
3024 }
3025 return 0;
3026}
3027
ceabb767 3028static
8cdc1a81 3029int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3030 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3031 size_t nesting)
3032{
3033 return lttng_metadata_printf(session, " _%s;\n", field->name);
3034}
3035
3036static
8cdc1a81 3037int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3038 const struct lttng_kernel_type_integer *type,
3039 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3040 size_t nesting)
3041{
3042 int ret;
3043
ceabb767
MD		 3044 ret = print_tabs(session, nesting);
3045 if (ret)
3046 return ret;
3047 ret = lttng_metadata_printf(session,
3048 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3049 type->size,
3050 type->alignment,
3051 type->signedness,
3052 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3053 ? "none"
437d5aa5 3054 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3055 ? "UTF8"
3056 : "ASCII",
437d5aa5 3057 type->base,
ceabb767 3058#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3059 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3060#else
437d5aa5 3061 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3062#endif
3063 );
3064 return ret;
3065}
3066
f513b2bf
MD		 3067/*
3068 * Must be called with sessions_mutex held.
3069 */
3070static
8cdc1a81 3071int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3072 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3073 size_t nesting)
3074{
51ef4536 3075 const char *prev_field_name = NULL;
f513b2bf
MD		 3076 int ret;
3077 uint32_t i, nr_fields;
ceabb767
MD		 3078 unsigned int alignment;
3079
f513b2bf
MD		 3080 ret = print_tabs(session, nesting);
3081 if (ret)
3082 return ret;
3083 ret = lttng_metadata_printf(session,
3084 "struct {\n");
3085 if (ret)
3086 return ret;
437d5aa5 3087 nr_fields = type->nr_fields;
f513b2bf 3088 for (i = 0; i < nr_fields; i++) {
437d5aa5 3089 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3090
437d5aa5 3091 iter_field = type->fields[i];
51ef4536 3092 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3093 if (ret)
3094 return ret;
3095 }
3096 ret = print_tabs(session, nesting);
3097 if (ret)
3098 return ret;
437d5aa5 3099 alignment = type->alignment;
ceabb767
MD		 3100 if (alignment) {
3101 ret = lttng_metadata_printf(session,
3102 "} align(%u)",
3103 alignment);
3104 } else {
3105 ret = lttng_metadata_printf(session,
3106 "}");
3107 }
f513b2bf
MD		 3108 return ret;
3109}
3110
3111/*
3112 * Must be called with sessions_mutex held.
3113 */
3114static
8cdc1a81 3115int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3116 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3117 size_t nesting)
3118{
3119 int ret;
3120
3121 ret = _lttng_struct_type_statedump(session,
437d5aa5 3122 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3123 if (ret)
3124 return ret;
ceabb767 3125 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3126}
3127
65c85aa6
MD		 3128/*
3129 * Must be called with sessions_mutex held.
3130 */
3131static
8cdc1a81 3132int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3133 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3134 size_t nesting,
3135 const char *prev_field_name)
65c85aa6 3136{
51ef4536 3137 const char *tag_name;
65c85aa6
MD		 3138 int ret;
3139 uint32_t i, nr_choices;
3140
51ef4536
MD		 3141 tag_name = type->tag_name;
3142 if (!tag_name)
3143 tag_name = prev_field_name;
3144 if (!tag_name)
3145 return -EINVAL;
ceabb767
MD		 3146 /*
3147 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3148 */
437d5aa5 3149 if (type->alignment != 0)
ceabb767 3150 return -EINVAL;
65c85aa6
MD		 3151 ret = print_tabs(session, nesting);
3152 if (ret)
3153 return ret;
3154 ret = lttng_metadata_printf(session,
3155 "variant <_%s> {\n",
51ef4536 3156 tag_name);
65c85aa6
MD		 3157 if (ret)
3158 return ret;
437d5aa5 3159 nr_choices = type->nr_choices;
65c85aa6 3160 for (i = 0; i < nr_choices; i++) {
437d5aa5 3161 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3162
437d5aa5 3163 iter_field = type->choices[i];
51ef4536 3164 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3165 if (ret)
3166 return ret;
3167 }
3168 ret = print_tabs(session, nesting);
3169 if (ret)
3170 return ret;
3171 ret = lttng_metadata_printf(session,
3172 "}");
3173 return ret;
3174}
3175
3176/*
3177 * Must be called with sessions_mutex held.
3178 */
3179static
8cdc1a81 3180int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3181 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3182 size_t nesting,
3183 const char *prev_field_name)
65c85aa6
MD		 3184{
3185 int ret;
3186
3187 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3188 lttng_kernel_get_type_variant(field->type), nesting,
3189 prev_field_name);
65c85aa6
MD		 3190 if (ret)
3191 return ret;
ceabb767 3192 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3193}
3194
f513b2bf
MD		 3195/*
3196 * Must be called with sessions_mutex held.
3197 */
3198static
8cdc1a81 3199int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3200 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3201 size_t nesting)
3202{
3203 int ret;
437d5aa5
MD		 3204 const struct lttng_kernel_type_array *array_type;
3205 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3206
437d5aa5
MD		 3207 array_type = lttng_kernel_get_type_array(field->type);
3208 WARN_ON_ONCE(!array_type);
ceabb767 3209
437d5aa5 3210 if (array_type->alignment) {
ceabb767 3211 ret = print_tabs(session, nesting);
f513b2bf
MD		 3212 if (ret)
3213 return ret;
ceabb767
MD		 3214 ret = lttng_metadata_printf(session,
3215 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3216 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3217 field->name);
3218 if (ret)
3219 return ret;
3220 }
3221 /*
3222 * Nested compound types: Only array of structures and variants are
3223 * currently supported.
3224 */
437d5aa5 3225 elem_type = array_type->elem_type;
12bb2edb
MD		 3226 switch (elem_type->type) {
3227 case lttng_kernel_type_integer:
437d5aa5
MD		 3228 case lttng_kernel_type_struct:
3229 case lttng_kernel_type_variant:
3230 ret = _lttng_type_statedump(session, elem_type,
3231 array_type->encoding, nesting);
65c85aa6
MD		 3232 if (ret)
3233 return ret;
3234 break;
ceabb767 3235
f513b2bf
MD		 3236 default:
3237 return -EINVAL;
3238 }
3239 ret = lttng_metadata_printf(session,
3240 " _%s[%u];\n",
3241 field->name,
437d5aa5 3242 array_type->length);
f513b2bf
MD		 3243 return ret;
3244}
3245
3246/*
3247 * Must be called with sessions_mutex held.
3248 */
3249static
8cdc1a81 3250int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3251 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3252 size_t nesting,
3253 const char *prev_field_name)
f513b2bf
MD		 3254{
3255 int ret;
3256 const char *length_name;
437d5aa5
MD		 3257 const struct lttng_kernel_type_sequence *sequence_type;
3258 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3259
437d5aa5
MD		 3260 sequence_type = lttng_kernel_get_type_sequence(field->type);
3261 WARN_ON_ONCE(!sequence_type);
f513b2bf 3262
437d5aa5 3263 length_name = sequence_type->length_name;
51ef4536
MD		 3264 if (!length_name)
3265 length_name = prev_field_name;
3266 if (!length_name)
3267 return -EINVAL;
ceabb767 3268
437d5aa5 3269 if (sequence_type->alignment) {
ceabb767 3270 ret = print_tabs(session, nesting);
f513b2bf
MD		 3271 if (ret)
3272 return ret;
ceabb767
MD		 3273 ret = lttng_metadata_printf(session,
3274 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3275 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3276 field->name);
3277 if (ret)
3278 return ret;
3279 }
3280
3281 /*
3282 * Nested compound types: Only array of structures and variants are
3283 * currently supported.
3284 */
437d5aa5 3285 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3286 switch (elem_type->type) {
3287 case lttng_kernel_type_integer:
437d5aa5
MD		 3288 case lttng_kernel_type_struct:
3289 case lttng_kernel_type_variant:
3290 ret = _lttng_type_statedump(session, elem_type,
3291 sequence_type->encoding, nesting);
65c85aa6
MD		 3292 if (ret)
3293 return ret;
3294 break;
ceabb767 3295
f513b2bf
MD		 3296 default:
3297 return -EINVAL;
3298 }
3299 ret = lttng_metadata_printf(session,
3300 " _%s[ _%s ];\n",
3301 field->name,
51ef4536 3302 length_name);
f513b2bf
MD		 3303 return ret;
3304}
3305
141ddf28
MD		 3306/*
3307 * Must be called with sessions_mutex held.
3308 */
3309static
8cdc1a81 3310int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3311 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3312 size_t nesting)
3313{
d96a4a7a 3314 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3315 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3316 int ret;
3317 unsigned int i, nr_entries;
3318
437d5aa5 3319 container_type = type->container_type;
12bb2edb 3320 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3321 ret = -EINVAL;
3322 goto end;
3323 }
437d5aa5 3324 enum_desc = type->desc;
141ddf28
MD		 3325 nr_entries = enum_desc->nr_entries;
3326
3327 ret = print_tabs(session, nesting);
3328 if (ret)
3329 goto end;
ceabb767
MD		 3330 ret = lttng_metadata_printf(session, "enum : ");
3331 if (ret)
3332 goto end;
437d5aa5
MD		 3333 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3334 lttng_kernel_string_encoding_none, 0);
141ddf28 3335 if (ret)
ceabb767
MD		 3336 goto end;
3337 ret = lttng_metadata_printf(session, " {\n");
3338 if (ret)
3339 goto end;
141ddf28
MD		 3340 /* Dump all entries */
3341 for (i = 0; i < nr_entries; i++) {
437d5aa5 3342 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3343 int j, len;
3344
3345 ret = print_tabs(session, nesting + 1);
3346 if (ret)
3347 goto end;
3348 ret = lttng_metadata_printf(session,
3349 "\"");
3350 if (ret)
3351 goto end;
3352 len = strlen(entry->string);
3353 /* Escape the character '"' */
3354 for (j = 0; j < len; j++) {
3355 char c = entry->string[j];
3356
3357 switch (c) {
3358 case '"':
3359 ret = lttng_metadata_printf(session,
3360 "\\\"");
3361 break;
3362 case '\\':
3363 ret = lttng_metadata_printf(session,
3364 "\\\\");
3365 break;
3366 default:
3367 ret = lttng_metadata_printf(session,
3368 "%c", c);
3369 break;
3370 }
3371 if (ret)
3372 goto end;
3373 }
08ad1061
PP		 3374 ret = lttng_metadata_printf(session, "\"");
3375 if (ret)
3376 goto end;
3377
3378 if (entry->options.is_auto) {
3379 ret = lttng_metadata_printf(session, ",\n");
3380 if (ret)
3381 goto end;
141ddf28 3382 } else {
7c559490
MD		 3383 ret = lttng_metadata_printf(session,
3384 " = ");
3385 if (ret)
3386 goto end;
3387 if (entry->start.signedness)
141ddf28 3388 ret = lttng_metadata_printf(session,
7c559490
MD		 3389 "%lld", (long long) entry->start.value);
3390 else
3391 ret = lttng_metadata_printf(session,
3392 "%llu", entry->start.value);
3393 if (ret)
3394 goto end;
3395 if (entry->start.signedness == entry->end.signedness &&
3396 entry->start.value
3397 == entry->end.value) {
141ddf28 3398 ret = lttng_metadata_printf(session,
7c559490
MD		 3399 ",\n");
3400 } else {
3401 if (entry->end.signedness) {
3402 ret = lttng_metadata_printf(session,
3403 " ... %lld,\n",
3404 (long long) entry->end.value);
3405 } else {
3406 ret = lttng_metadata_printf(session,
3407 " ... %llu,\n",
3408 entry->end.value);
3409 }
141ddf28 3410 }
7c559490
MD		 3411 if (ret)
3412 goto end;
141ddf28 3413 }
141ddf28
MD		 3414 }
3415 ret = print_tabs(session, nesting);
3416 if (ret)
3417 goto end;
ceabb767 3418 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3419end:
3420 return ret;
3421}
3422
d83004aa
JD		 3423/*
3424 * Must be called with sessions_mutex held.
3425 */
c099397a 3426static
8cdc1a81 3427int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3428 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3429 size_t nesting)
3430{
3431 int ret;
437d5aa5 3432 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3433
437d5aa5
MD		 3434 enum_type = lttng_kernel_get_type_enum(field->type);
3435 WARN_ON_ONCE(!enum_type);
3436 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3437 if (ret)
3438 return ret;
3439 return lttng_field_name_statedump(session, field, nesting);
3440}
3441
3442static
8cdc1a81 3443int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3444 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3445 size_t nesting)
3446{
3447 int ret;
3448
437d5aa5
MD		 3449 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3450 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3451 if (ret)
3452 return ret;
3453 return lttng_field_name_statedump(session, field, nesting);
3454}
3455
3456static
8cdc1a81 3457int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3458 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3459 size_t nesting)
3460{
3461 int ret;
3462
ceabb767
MD		 3463 /* Default encoding is UTF8 */
3464 ret = print_tabs(session, nesting);
3465 if (ret)
3466 return ret;
3467 ret = lttng_metadata_printf(session,
3468 "string%s",
437d5aa5 3469 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3470 " { encoding = ASCII; }" : "");
3471 return ret;
3472}
3473
3474static
8cdc1a81 3475int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3476 const struct lttng_kernel_event_field *field,
f513b2bf 3477 size_t nesting)
ceabb767 3478{
437d5aa5 3479 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3480 int ret;
3481
437d5aa5
MD		 3482 string_type = lttng_kernel_get_type_string(field->type);
3483 WARN_ON_ONCE(!string_type);
3484 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3485 if (ret)
3486 return ret;
3487 return lttng_field_name_statedump(session, field, nesting);
3488}
3489
3490/*
3491 * Must be called with sessions_mutex held.
3492 */
3493static
8cdc1a81 3494int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3495 const struct lttng_kernel_type_common *type,
3496 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3497 size_t nesting)
c099397a 3498{
c099397a 3499 int ret = 0;
c099397a 3500
12bb2edb
MD		 3501 switch (type->type) {
3502 case lttng_kernel_type_integer:
437d5aa5
MD		 3503 ret = _lttng_integer_type_statedump(session,
3504 lttng_kernel_get_type_integer(type),
3505 parent_encoding, nesting);
8070f5c0 3506 break;
437d5aa5
MD		 3507 case lttng_kernel_type_enum:
3508 ret = _lttng_enum_type_statedump(session,
3509 lttng_kernel_get_type_enum(type),
3510 nesting);
8070f5c0 3511 break;
12bb2edb 3512 case lttng_kernel_type_string:
437d5aa5
MD		 3513 ret = _lttng_string_type_statedump(session,
3514 lttng_kernel_get_type_string(type),
3515 nesting);
ceabb767 3516 break;
437d5aa5
MD		 3517 case lttng_kernel_type_struct:
3518 ret = _lttng_struct_type_statedump(session,
3519 lttng_kernel_get_type_struct(type),
3520 nesting);
8070f5c0 3521 break;
437d5aa5
MD		 3522 case lttng_kernel_type_variant:
3523 ret = _lttng_variant_type_statedump(session,
3524 lttng_kernel_get_type_variant(type),
51ef4536 3525 nesting, NULL);
ceabb767
MD		 3526 break;
3527
3528 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3529 case lttng_kernel_type_array:
3530 case lttng_kernel_type_sequence:
ceabb767
MD		 3531 default:
3532 WARN_ON_ONCE(1);
3533 return -EINVAL;
8070f5c0 3534 }
ceabb767
MD		 3535 return ret;
3536}
8070f5c0 3537
ceabb767
MD		 3538/*
3539 * Must be called with sessions_mutex held.
3540 */
3541static
8cdc1a81 3542int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3543 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3544 size_t nesting,
3545 const char **prev_field_name_p)
ceabb767 3546{
51ef4536 3547 const char *prev_field_name = NULL;
ceabb767 3548 int ret = 0;
27d2368e 3549
51ef4536
MD		 3550 if (prev_field_name_p)
3551 prev_field_name = *prev_field_name_p;
437d5aa5 3552 switch (field->type->type) {
12bb2edb 3553 case lttng_kernel_type_integer:
ceabb767
MD		 3554 ret = _lttng_integer_field_statedump(session, field, nesting);
3555 break;
437d5aa5 3556 case lttng_kernel_type_enum:
ceabb767 3557 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3558 break;
12bb2edb 3559 case lttng_kernel_type_string:
ceabb767 3560 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3561 break;
437d5aa5 3562 case lttng_kernel_type_struct:
ceabb767 3563 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3564 break;
437d5aa5 3565 case lttng_kernel_type_array:
ceabb767 3566 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3567 break;
437d5aa5 3568 case lttng_kernel_type_sequence:
51ef4536 3569 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3570 break;
437d5aa5 3571 case lttng_kernel_type_variant:
51ef4536 3572 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3573 break;
f513b2bf 3574
8070f5c0
MD		 3575 default:
3576 WARN_ON_ONCE(1);
3577 return -EINVAL;
3578 }
51ef4536
MD		 3579 if (prev_field_name_p)
3580 *prev_field_name_p = field->name;
8070f5c0
MD		 3581 return ret;
3582}
3583
3584static
8cdc1a81 3585int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3586 struct lttng_kernel_ctx *ctx)
8070f5c0 3587{
51ef4536 3588 const char *prev_field_name = NULL;
8070f5c0
MD		 3589 int ret = 0;
3590 int i;
3591
3592 if (!ctx)
3593 return 0;
3594 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3595 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3596
51ef4536 3597 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3598 if (ret)
3599 return ret;
3600 }
3601 return ret;
3602}
3603
3604static
8cdc1a81 3605int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3606 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3607{
51ef4536 3608 const char *prev_field_name = NULL;
a67ba386 3609 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3610 int ret = 0;
3611 int i;
3612
3613 for (i = 0; i < desc->nr_fields; i++) {
437d5aa5 3614 const struct lttng_kernel_event_field *field = desc->fields[i];
8070f5c0 3615
51ef4536 3616 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3617 if (ret)
3618 return ret;
c099397a
MD		 3619 }
3620 return ret;
3621}
3622
d83004aa
JD		 3623/*
3624 * Must be called with sessions_mutex held.
8b97fd42
MD		 3625 * The entire event metadata is printed as a single atomic metadata
3626 * transaction.
d83004aa 3627 */
c099397a 3628static
8cdc1a81 3629int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
a90917c3 3630 struct lttng_channel *chan,
a67ba386 3631 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3632{
3633 int ret = 0;
3634
a67ba386 3635 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3636 return 0;
d83004aa 3637 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3638 return 0;
3639
8b97fd42
MD		 3640 lttng_metadata_begin(session);
3641
c099397a
MD		 3642 ret = lttng_metadata_printf(session,
3643 "event {\n"
ae734547 3644 " name = \"%s\";\n"
c099397a 3645 " id = %u;\n"
b9074a1b 3646 " stream_id = %u;\n",
a67ba386
MD		 3647 event_recorder->priv->parent.desc->event_name,
3648 event_recorder->priv->id,
3649 event_recorder->chan->id);
c099397a
MD		 3650 if (ret)
3651 goto end;
3652
8070f5c0 3653 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3654 " fields := struct {\n"
3655 );
3656 if (ret)
3657 goto end;
3658
a67ba386 3659 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3660 if (ret)
3661 goto end;
3662
3663 /*
3664 * LTTng space reservation can only reserve multiples of the
3665 * byte size.
3666 */
3667 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3668 " };\n"
3669 "};\n\n");
c099397a
MD		 3670 if (ret)
3671 goto end;
3672
a67ba386 3673 event_recorder->priv->metadata_dumped = 1;
c099397a 3674end:
8b97fd42 3675 lttng_metadata_end(session);
c099397a
MD		 3676 return ret;
3677
3678}
3679
d83004aa
JD		 3680/*
3681 * Must be called with sessions_mutex held.
8b97fd42
MD		 3682 * The entire channel metadata is printed as a single atomic metadata
3683 * transaction.
d83004aa 3684 */
c099397a 3685static
8cdc1a81 3686int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
a90917c3 3687 struct lttng_channel *chan)
c099397a
MD		 3688{
3689 int ret = 0;
3690
585e5dcc 3691 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3692 return 0;
d83004aa
JD		 3693
3694 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3695 return 0;
3696
8b97fd42
MD		 3697 lttng_metadata_begin(session);
3698
c099397a
MD		 3699 WARN_ON_ONCE(!chan->header_type);
3700 ret = lttng_metadata_printf(session,
3701 "stream {\n"
3702 " id = %u;\n"
9115fbdc 3703 " event.header := %s;\n"
b9074a1b 3704 " packet.context := struct packet_context;\n",
c099397a
MD		 3705 chan->id,
3706 chan->header_type == 1 ? "struct event_header_compact" :
3707 "struct event_header_large");
3708 if (ret)
3709 goto end;
3710
b9074a1b
MD		 3711 if (chan->ctx) {
3712 ret = lttng_metadata_printf(session,
3713 " event.context := struct {\n");
3714 if (ret)
3715 goto end;
3716 }
a90917c3 3717 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 3718 if (ret)
3719 goto end;
b9074a1b
MD		 3720 if (chan->ctx) {
3721 ret = lttng_metadata_printf(session,
3722 " };\n");
3723 if (ret)
3724 goto end;
3725 }
8070f5c0
MD		 3726
3727 ret = lttng_metadata_printf(session,
b9074a1b 3728 "};\n\n");
8070f5c0 3729
c099397a
MD		 3730 chan->metadata_dumped = 1;
3731end:
8b97fd42 3732 lttng_metadata_end(session);
c099397a
MD		 3733 return ret;
3734}
3735
d83004aa
JD		 3736/*
3737 * Must be called with sessions_mutex held.
3738 */
9115fbdc 3739static
8cdc1a81 3740int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3741{
3742 return lttng_metadata_printf(session,
3743 "struct packet_context {\n"
a3ccff4f
MD		 3744 " uint64_clock_monotonic_t timestamp_begin;\n"
3745 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3746 " uint64_t content_size;\n"
3747 " uint64_t packet_size;\n"
5b3cf4f9 3748 " uint64_t packet_seq_num;\n"
a9afe705 3749 " unsigned long events_discarded;\n"
9115fbdc 3750 " uint32_t cpu_id;\n"
c6dfdf6f 3751 "};\n\n"
9115fbdc
MD		 3752 );
3753}
3754
3755/*
3756 * Compact header:
3757 * id: range: 0 - 30.
3758 * id 31 is reserved to indicate an extended header.
3759 *
3760 * Large header:
3761 * id: range: 0 - 65534.
3762 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3763 *
3764 * Must be called with sessions_mutex held.
9115fbdc
MD		 3765 */
3766static
8cdc1a81 3767int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3768{
3769 return lttng_metadata_printf(session,
3770 "struct event_header_compact {\n"
3771 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3772 " variant <id> {\n"
3773 " struct {\n"
a3ccff4f 3774 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3775 " } compact;\n"
3776 " struct {\n"
3777 " uint32_t id;\n"
a3ccff4f 3778 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3779 " } extended;\n"
3780 " } v;\n"
3781 "} align(%u);\n"
3782 "\n"
3783 "struct event_header_large {\n"
3784 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3785 " variant <id> {\n"
3786 " struct {\n"
a3ccff4f 3787 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3788 " } compact;\n"
3789 " struct {\n"
3790 " uint32_t id;\n"
a3ccff4f 3791 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3792 " } extended;\n"
3793 " } v;\n"
3794 "} align(%u);\n\n",
a90917c3
MD		 3795 lttng_alignof(uint32_t) * CHAR_BIT,
3796 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3797 );
3798}
3799
a3ccff4f
MD		 3800 /*
3801 * Approximation of NTP time of day to clock monotonic correlation,
3802 * taken at start of trace.
3803 * Yes, this is only an approximation. Yes, we can (and will) do better
3804 * in future versions.
5283350b
MD		 3805 * This function may return a negative offset. It may happen if the
3806 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3807 *
3808 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3809 * y2038 compliant.
a3ccff4f
MD		 3810 */
3811static
8967b2a3 3812int64_t measure_clock_offset(void)
a3ccff4f 3813{
dcb93448 3814 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3815 uint64_t tcf = trace_clock_freq();
dcb93448 3816 int64_t offset;
a3ccff4f 3817 unsigned long flags;
3636085f
MJ		 3818#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3819 struct timespec64 rts = { 0, 0 };
3820#else
3821 struct timespec rts = { 0, 0 };
3822#endif
a3ccff4f
MD		 3823
3824 /* Disable interrupts to increase correlation precision. */
3825 local_irq_save(flags);
3826 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3827#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3828 ktime_get_real_ts64(&rts);
3829#else
216b6baa 3830 getnstimeofday(&rts);
3636085f 3831#endif
a3ccff4f
MD		 3832 monotonic[1] = trace_clock_read64();
3833 local_irq_restore(flags);
3834
dcb93448 3835 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3836 realtime = (uint64_t) rts.tv_sec * tcf;
3837 if (tcf == NSEC_PER_SEC) {
3838 realtime += rts.tv_nsec;
3839 } else {
3840 uint64_t n = rts.tv_nsec * tcf;
3841
3842 do_div(n, NSEC_PER_SEC);
3843 realtime += n;
3844 }
dcb93448 3845 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3846 return offset;
3847}
3848
3eb95be4 3849static
8cdc1a81 3850int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3851{
0f3eaad4 3852 int ret = 0;
3eb95be4
JR		 3853 size_t i;
3854 char cur;
3855
3856 i = 0;
3857 cur = string[i];
3858 while (cur != '\0') {
3859 switch (cur) {
3860 case '\n':
3861 ret = lttng_metadata_printf(session, "%s", "\\n");
3862 break;
3863 case '\\':
3864 case '"':
3865 ret = lttng_metadata_printf(session, "%c", '\\');
3866 if (ret)
3867 goto error;
3868 /* We still print the current char */
3869 /* Fallthrough */
3870 default:
3871 ret = lttng_metadata_printf(session, "%c", cur);
3872 break;
3873 }
3874
3875 if (ret)
3876 goto error;
3877
3878 cur = string[++i];
3879 }
3880error:
3881 return ret;
3882}
3883
3884static
8cdc1a81 3885int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3886 const char *field_value)
3eb95be4
JR		 3887{
3888 int ret;
3889
1c88f269 3890 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3891 if (ret)
3892 goto error;
3893
1c88f269 3894 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3895 if (ret)
3896 goto error;
3897
3898 ret = lttng_metadata_printf(session, "\";\n");
3899
3900error:
3901 return ret;
3902}
3903
c099397a
MD		 3904/*
3905 * Output metadata into this session's metadata buffers.
d83004aa 3906 * Must be called with sessions_mutex held.
c099397a
MD		 3907 */
3908static
8cdc1a81 3909int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3910{
8cdc1a81 3911 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3912 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3913 const char *product_uuid;
a90917c3 3914 struct lttng_channel *chan;
a67ba386 3915 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3916 int ret = 0;
3917
585e5dcc 3918 if (!LTTNG_READ_ONCE(session->active))
c099397a 3919 return 0;
8b97fd42
MD		 3920
3921 lttng_metadata_begin(session);
3922
8cdc1a81 3923 if (session->priv->metadata_dumped)
c099397a 3924 goto skip_session;
c099397a 3925
d793d5e1 3926 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3927 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3928 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3929 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3930 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3931 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3932
3933 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3934 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3935 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3936 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3937 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3938 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3939 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3940 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3941 "\n"
3942 "trace {\n"
3943 " major = %u;\n"
3944 " minor = %u;\n"
30bdb6e4 3945 " uuid = \"%s\";\n"
d793d5e1
MD		 3946 " byte_order = %s;\n"
3947 " packet.header := struct {\n"
3948 " uint32_t magic;\n"
1ec3f75a 3949 " uint8_t uuid[16];\n"
d793d5e1 3950 " uint32_t stream_id;\n"
5594698f 3951 " uint64_t stream_instance_id;\n"
0eb25f58 3952 " };\n"
d793d5e1 3953 "};\n\n",
a90917c3
MD		 3954 lttng_alignof(uint8_t) * CHAR_BIT,
3955 lttng_alignof(uint16_t) * CHAR_BIT,
3956 lttng_alignof(uint32_t) * CHAR_BIT,
3957 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3958 sizeof(unsigned long) * CHAR_BIT,
3959 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3960 CTF_SPEC_MAJOR,
3961 CTF_SPEC_MINOR,
d793d5e1 3962 uuid_s,
5214fa50 3963#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3964 "be"
3965#else
3966 "le"
3967#endif
3968 );
3969 if (ret)
3970 goto end;
3971
99dc9597
MD		 3972 ret = lttng_metadata_printf(session,
3973 "env {\n"
a6058143 3974 " hostname = \"%s\";\n"
c6c9e10f 3975 " domain = \"kernel\";\n"
99dc9597 3976 " sysname = \"%s\";\n"
c6c9e10f
MD		 3977 " kernel_release = \"%s\";\n"
3978 " kernel_version = \"%s\";\n"
3979 " tracer_name = \"lttng-modules\";\n"
3980 " tracer_major = %d;\n"
3981 " tracer_minor = %d;\n"
3982 " tracer_patchlevel = %d;\n"
3eb95be4 3983 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3984 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3985 utsname()->sysname,
3986 utsname()->release,
c6c9e10f
MD		 3987 utsname()->version,
3988 LTTNG_MODULES_MAJOR_VERSION,
3989 LTTNG_MODULES_MINOR_VERSION,
3990 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3991 );
3992 if (ret)
3993 goto end;
3994
8cdc1a81 3995 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 3996 if (ret)
3997 goto end;
3998 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 3999 session->priv->creation_time);
3eb95be4
JR		 4000 if (ret)
4001 goto end;
4002
c88f762e
GB		 4003 /* Add the product UUID to the 'env' section */
4004 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4005 if (product_uuid) {
4006 ret = lttng_metadata_printf(session,
4007 " product_uuid = \"%s\";\n",
4008 product_uuid
4009 );
4010 if (ret)
4011 goto end;
4012 }
4013
4014 /* Close the 'env' section */
3eb95be4
JR		 4015 ret = lttng_metadata_printf(session, "};\n\n");
4016 if (ret)
4017 goto end;
4018
a3ccff4f
MD		 4019 ret = lttng_metadata_printf(session,
4020 "clock {\n"
2754583e
MD		 4021 " name = \"%s\";\n",
4022 trace_clock_name()
a82c63f1
MD		 4023 );
4024 if (ret)
4025 goto end;
4026
4027 if (!trace_clock_uuid(clock_uuid_s)) {
4028 ret = lttng_metadata_printf(session,
7c27cb17 4029 " uuid = \"%s\";\n",
a82c63f1
MD		 4030 clock_uuid_s
4031 );
4032 if (ret)
4033 goto end;
4034 }
4035
4036 ret = lttng_metadata_printf(session,
2754583e 4037 " description = \"%s\";\n"
a3ccff4f
MD		 4038 " freq = %llu; /* Frequency, in Hz */\n"
4039 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4040 " offset = %lld;\n"
a3ccff4f 4041 "};\n\n",
2754583e 4042 trace_clock_description(),
a3ccff4f 4043 (unsigned long long) trace_clock_freq(),
8967b2a3 4044 (long long) measure_clock_offset()
a3ccff4f
MD		 4045 );
4046 if (ret)
4047 goto end;
4048
4049 ret = lttng_metadata_printf(session,
4050 "typealias integer {\n"
4051 " size = 27; align = 1; signed = false;\n"
2754583e 4052 " map = clock.%s.value;\n"
a3ccff4f
MD		 4053 "} := uint27_clock_monotonic_t;\n"
4054 "\n"
4055 "typealias integer {\n"
4056 " size = 32; align = %u; signed = false;\n"
2754583e 4057 " map = clock.%s.value;\n"
a3ccff4f
MD		 4058 "} := uint32_clock_monotonic_t;\n"
4059 "\n"
4060 "typealias integer {\n"
4061 " size = 64; align = %u; signed = false;\n"
2754583e 4062 " map = clock.%s.value;\n"
a3ccff4f 4063 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4064 trace_clock_name(),
a3ccff4f 4065 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4066 trace_clock_name(),
4067 lttng_alignof(uint64_t) * CHAR_BIT,
4068 trace_clock_name()
a3ccff4f
MD		 4069 );
4070 if (ret)
4071 goto end;
4072
a90917c3 4073 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4074 if (ret)
4075 goto end;
4076
a90917c3 4077 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4078 if (ret)
4079 goto end;
4080
c099397a 4081skip_session:
8cdc1a81 4082 list_for_each_entry(chan, &session->priv->chan, list) {
a90917c3 4083 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 4084 if (ret)
4085 goto end;
4086 }
4087
8cdc1a81 4088 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386
MD		 4089 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4090 event_recorder_priv->pub);
c099397a
MD		 4091 if (ret)
4092 goto end;
4093 }
8cdc1a81 4094 session->priv->metadata_dumped = 1;
c099397a 4095end:
8b97fd42 4096 lttng_metadata_end(session);
c099397a
MD		 4097 return ret;
4098}
4099
c0e31d2e 4100/**
a90917c3 4101 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4102 * @transport: transport structure
4103 *
4104 * Registers a transport which can be used as output to extract the data out of
4105 * LTTng. The module calling this registration function must ensure that no
4106 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4107 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4108 * is made visible to the transport function. This registration acts as a
263b6c88 4109 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4110 * after its registration must it synchronize the TLBs.
4111 */
a90917c3 4112void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4113{
4114 /*
4115 * Make sure no page fault can be triggered by the module about to be
4116 * registered. We deal with this here so we don't have to call
263b6c88 4117 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4118 */
263b6c88 4119 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4120
4121 mutex_lock(&sessions_mutex);
a90917c3 4122 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4123 mutex_unlock(&sessions_mutex);
4124}
a90917c3 4125EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4126
4127/**
a90917c3 4128 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4129 * @transport: transport structure
4130 */
a90917c3 4131void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4132{
4133 mutex_lock(&sessions_mutex);
4134 list_del(&transport->node);
4135 mutex_unlock(&sessions_mutex);
4136}
a90917c3 4137EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4138
a101fa10
MD		 4139void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4140{
4141 /*
4142 * Make sure no page fault can be triggered by the module about to be
4143 * registered. We deal with this here so we don't have to call
4144 * vmalloc_sync_mappings() in each module's init.
4145 */
4146 wrapper_vmalloc_sync_mappings();
4147
4148 mutex_lock(&sessions_mutex);
4149 list_add_tail(&transport->node, &lttng_counter_transport_list);
4150 mutex_unlock(&sessions_mutex);
4151}
4152EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4153
4154void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4155{
4156 mutex_lock(&sessions_mutex);
4157 list_del(&transport->node);
4158 mutex_unlock(&sessions_mutex);
4159}
4160EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4161
5f4c791e 4162#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4163
4164enum cpuhp_state lttng_hp_prepare;
4165enum cpuhp_state lttng_hp_online;
4166
4167static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4168{
4169 struct lttng_cpuhp_node *lttng_node;
4170
4171 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4172 switch (lttng_node->component) {
4173 case LTTNG_RING_BUFFER_FRONTEND:
4174 return 0;
4175 case LTTNG_RING_BUFFER_BACKEND:
4176 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4177 case LTTNG_RING_BUFFER_ITER:
4178 return 0;
4179 case LTTNG_CONTEXT_PERF_COUNTERS:
4180 return 0;
4181 default:
4182 return -EINVAL;
4183 }
4184}
4185
4186static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4187{
4188 struct lttng_cpuhp_node *lttng_node;
4189
4190 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4191 switch (lttng_node->component) {
4192 case LTTNG_RING_BUFFER_FRONTEND:
4193 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4194 case LTTNG_RING_BUFFER_BACKEND:
4195 return 0;
4196 case LTTNG_RING_BUFFER_ITER:
4197 return 0;
4198 case LTTNG_CONTEXT_PERF_COUNTERS:
4199 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4200 default:
4201 return -EINVAL;
4202 }
4203}
4204
4205static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4206{
4207 struct lttng_cpuhp_node *lttng_node;
4208
4209 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4210 switch (lttng_node->component) {
4211 case LTTNG_RING_BUFFER_FRONTEND:
4212 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4213 case LTTNG_RING_BUFFER_BACKEND:
4214 return 0;
4215 case LTTNG_RING_BUFFER_ITER:
4216 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4217 case LTTNG_CONTEXT_PERF_COUNTERS:
4218 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4219 default:
4220 return -EINVAL;
4221 }
4222}
4223
4224static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4225{
4226 struct lttng_cpuhp_node *lttng_node;
4227
4228 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4229 switch (lttng_node->component) {
4230 case LTTNG_RING_BUFFER_FRONTEND:
4231 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4232 case LTTNG_RING_BUFFER_BACKEND:
4233 return 0;
4234 case LTTNG_RING_BUFFER_ITER:
4235 return 0;
4236 case LTTNG_CONTEXT_PERF_COUNTERS:
4237 return 0;
4238 default:
4239 return -EINVAL;
4240 }
4241}
4242
4243static int __init lttng_init_cpu_hotplug(void)
4244{
4245 int ret;
4246
4247 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4248 lttng_hotplug_prepare,
4249 lttng_hotplug_dead);
4250 if (ret < 0) {
4251 return ret;
4252 }
4253 lttng_hp_prepare = ret;
4254 lttng_rb_set_hp_prepare(ret);
4255
4256 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4257 lttng_hotplug_online,
4258 lttng_hotplug_offline);
4259 if (ret < 0) {
4260 cpuhp_remove_multi_state(lttng_hp_prepare);
4261 lttng_hp_prepare = 0;
4262 return ret;
4263 }
4264 lttng_hp_online = ret;
4265 lttng_rb_set_hp_online(ret);
4266
4267 return 0;
4268}
4269
4270static void __exit lttng_exit_cpu_hotplug(void)
4271{
4272 lttng_rb_set_hp_online(0);
4273 cpuhp_remove_multi_state(lttng_hp_online);
4274 lttng_rb_set_hp_prepare(0);
4275 cpuhp_remove_multi_state(lttng_hp_prepare);
4276}
4277
5f4c791e 4278#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4279static int lttng_init_cpu_hotplug(void)
4280{
4281 return 0;
4282}
4283static void lttng_exit_cpu_hotplug(void)
4284{
4285}
5f4c791e 4286#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4287
4288
a90917c3 4289static int __init lttng_events_init(void)
4e3c1b9b 4290{
1c25284c
MD		 4291 int ret;
4292
453b2495
JD		 4293 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4294 if (ret)
4295 return ret;
389d7070 4296 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4297 if (ret)
4298 return ret;
4299 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4300 if (ret)
4301 return ret;
4302 ret = lttng_probes_init();
389d7070
MD		 4303 if (ret)
4304 return ret;
07dfc1d0 4305 ret = lttng_context_init();
20591cf7
MD		 4306 if (ret)
4307 return ret;
07dfc1d0
MD		 4308 ret = lttng_tracepoint_init();
4309 if (ret)
4310 goto error_tp;
a67ba386
MD		 4311 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4312 if (!event_recorder_cache) {
20591cf7 4313 ret = -ENOMEM;
a67ba386 4314 goto error_kmem_event_recorder;
dffef45d 4315 }
a67ba386
MD		 4316 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4317 if (!event_recorder_private_cache) {
4318 ret = -ENOMEM;
4319 goto error_kmem_event_recorder_private;
4320 }
4321 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4322 if (!event_notifier_cache) {
4323 ret = -ENOMEM;
4324 goto error_kmem_event_notifier;
20591cf7 4325 }
a67ba386
MD		 4326 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4327 if (!event_notifier_private_cache) {
4328 ret = -ENOMEM;
4329 goto error_kmem_event_notifier_private;
4330 }
80996790 4331 ret = lttng_abi_init();
02119ee5
MD		 4332 if (ret)
4333 goto error_abi;
0c956676
MD		 4334 ret = lttng_logger_init();
4335 if (ret)
4336 goto error_logger;
1e367326
MD		 4337 ret = lttng_init_cpu_hotplug();
4338 if (ret)
4339 goto error_hotplug;
101215b7 4340 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4341 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4342 __stringify(LTTNG_MODULES_MINOR_VERSION),
4343 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4344 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4345 LTTNG_VERSION_NAME,
4346#ifdef LTTNG_EXTRA_VERSION_GIT
4347 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4348#else
4349 "",
4350#endif
4351#ifdef LTTNG_EXTRA_VERSION_NAME
4352 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4353#else
4354 "");
4355#endif
4e3c1b9b 4356 return 0;
0c956676 4357
1e367326
MD		 4358error_hotplug:
4359 lttng_logger_exit();
0c956676
MD		 4360error_logger:
4361 lttng_abi_exit();
02119ee5 4362error_abi:
a67ba386
MD		 4363 kmem_cache_destroy(event_notifier_private_cache);
4364error_kmem_event_notifier_private:
dffef45d
FD		 4365 kmem_cache_destroy(event_notifier_cache);
4366error_kmem_event_notifier:
a67ba386
MD		 4367 kmem_cache_destroy(event_recorder_private_cache);
4368error_kmem_event_recorder_private:
4369 kmem_cache_destroy(event_recorder_cache);
4370error_kmem_event_recorder:
20591cf7 4371 lttng_tracepoint_exit();
07dfc1d0
MD		 4372error_tp:
4373 lttng_context_exit();
101215b7 4374 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4375 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4376 __stringify(LTTNG_MODULES_MINOR_VERSION),
4377 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4378 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4379 LTTNG_VERSION_NAME,
4380#ifdef LTTNG_EXTRA_VERSION_GIT
4381 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4382#else
4383 "",
4384#endif
4385#ifdef LTTNG_EXTRA_VERSION_NAME
4386 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4387#else
4388 "");
4389#endif
1c25284c 4390 return ret;
4e3c1b9b
MD		 4391}
4392
a90917c3 4393module_init(lttng_events_init);
11b5a3c2 4394
a90917c3 4395static void __exit lttng_events_exit(void)
4e3c1b9b 4396{
8cdc1a81 4397 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4398
1e367326 4399 lttng_exit_cpu_hotplug();
0c956676 4400 lttng_logger_exit();
80996790 4401 lttng_abi_exit();
8cdc1a81
MD		 4402 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4403 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4404 kmem_cache_destroy(event_recorder_cache);
4405 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4406 kmem_cache_destroy(event_notifier_cache);
a67ba386 4407 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4408 lttng_tracepoint_exit();
07dfc1d0 4409 lttng_context_exit();
101215b7 4410 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4411 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4412 __stringify(LTTNG_MODULES_MINOR_VERSION),
4413 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4414 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4415 LTTNG_VERSION_NAME,
4416#ifdef LTTNG_EXTRA_VERSION_GIT
4417 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4418#else
4419 "",
4420#endif
4421#ifdef LTTNG_EXTRA_VERSION_NAME
4422 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4423#else
4424 "");
4425#endif
4e3c1b9b 4426}
92e94819 4427
a90917c3 4428module_exit(lttng_events_exit);
11b5a3c2 4429
7ca11e77 4430#include <generated/patches.h>
101215b7
MJ		 4431#ifdef LTTNG_EXTRA_VERSION_GIT
4432MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4433#endif
4434#ifdef LTTNG_EXTRA_VERSION_NAME
4435MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4436#endif
92e94819
MD		 4437MODULE_LICENSE("GPL and additional rights");
4438MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4439MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4440MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4441 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4442 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4443 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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