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Refactoring: introduce list head from enabler getter
[lttng-modules.git] / src / lttng-events.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
a90917c3 3 * lttng-events.c
4e3c1b9b 4 *
4e3c1b9b 5 * Holds LTTng per-session event registry.
17baffe2 6 *
886d51a3 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4e3c1b9b
MD		 8 */
9
389d7070
MD		 10/*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14#include "wrapper/page_alloc.h"
15
4e3c1b9b 16#include <linux/module.h>
c0e31d2e
MD		 17#include <linux/mutex.h>
18#include <linux/sched.h>
11b5a3c2 19#include <linux/slab.h>
c099397a 20#include <linux/jiffies.h>
99dc9597 21#include <linux/utsname.h>
abc0446a 22#include <linux/err.h>
7e6f9ef6
MD		 23#include <linux/seq_file.h>
24#include <linux/file.h>
25#include <linux/anon_inodes.h>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
c190d76e 31#include <wrapper/compiler_attributes.h>
a7008254 32#include <wrapper/uuid.h>
263b6c88 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 34#include <wrapper/random.h>
35#include <wrapper/tracepoint.h>
36#include <wrapper/list.h>
cbc19040 37#include <wrapper/types.h>
2df37e95
MD		 38#include <lttng/kernel-version.h>
39#include <lttng/events.h>
92bc1e23 40#include <lttng/events-internal.h>
0b365677 41#include <lttng/lttng-bytecode.h>
2df37e95 42#include <lttng/tracer.h>
21f58fb7 43#include <lttng/event-notifier-notification.h>
2df37e95
MD		 44#include <lttng/abi-old.h>
45#include <lttng/endian.h>
46#include <lttng/string-utils.h>
4a11ef1c 47#include <lttng/utils.h>
24591303
MD		 48#include <ringbuffer/backend.h>
49#include <ringbuffer/frontend.h>
3636085f 50#include <wrapper/time.h>
4e3c1b9b 51
d83004aa
JD		 52#define METADATA_CACHE_DEFAULT_SIZE 4096
53
4e3c1b9b 54static LIST_HEAD(sessions);
750b05f2 55static LIST_HEAD(event_notifier_groups);
a90917c3 56static LIST_HEAD(lttng_transport_list);
a101fa10 57static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 58/*
59 * Protect the sessions and metadata caches.
60 */
4e3c1b9b 61static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 62static struct kmem_cache *event_recorder_cache;
63static struct kmem_cache *event_recorder_private_cache;
dffef45d 64static struct kmem_cache *event_notifier_cache;
a67ba386 65static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 66
8cdc1a81
MD		 67static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
68static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b01155ba 69static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
7b25ab0e 70static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
3c997079 71
0648898e 72static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
f7d06400 73static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
f0bcc14c 74static int _lttng_event_unregister(struct lttng_kernel_event_common *event);
c099397a 75static
8cdc1a81 76int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 77 struct lttng_kernel_channel_buffer *chan,
a67ba386 78 struct lttng_kernel_event_recorder *event);
c099397a 79static
8cdc1a81 80int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 81static
82void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 83static
8cdc1a81 84int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 85 const struct lttng_kernel_type_common *type,
86 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 87 size_t nesting);
88static
8cdc1a81 89int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 90 const struct lttng_kernel_event_field *field,
51ef4536 91 size_t nesting, const char **prev_field_name_p);
c099397a 92
c099397a 93void synchronize_trace(void)
abcca994 94{
05355f0b
MJ		 95#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
96 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 97 synchronize_rcu();
98#else
abcca994 99 synchronize_sched();
92da05ce
MJ		 100#endif
101
5f4c791e 102#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 103#ifdef CONFIG_PREEMPT_RT_FULL
104 synchronize_rcu();
105#endif
5f4c791e 106#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 107#ifdef CONFIG_PREEMPT_RT
108 synchronize_rcu();
109#endif
5f4c791e 110#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 111}
112
3c997079
MD		 113void lttng_lock_sessions(void)
114{
115 mutex_lock(&sessions_mutex);
116}
117
118void lttng_unlock_sessions(void)
119{
120 mutex_unlock(&sessions_mutex);
121}
122
9fe593d2
FD		 123static struct lttng_transport *lttng_transport_find(const char *name)
124{
125 struct lttng_transport *transport;
126
127 list_for_each_entry(transport, &lttng_transport_list, node) {
128 if (!strcmp(transport->name, name))
129 return transport;
130 }
131 return NULL;
132}
133
3c997079
MD		 134/*
135 * Called with sessions lock held.
136 */
137int lttng_session_active(void)
138{
8cdc1a81 139 struct lttng_kernel_session_private *iter;
3c997079
MD		 140
141 list_for_each_entry(iter, &sessions, list) {
8cdc1a81 142 if (iter->pub->active)
3c997079
MD		 143 return 1;
144 }
145 return 0;
146}
147
8cdc1a81 148struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 149{
8cdc1a81
MD		 150 struct lttng_kernel_session *session;
151 struct lttng_kernel_session_private *session_priv;
d83004aa 152 struct lttng_metadata_cache *metadata_cache;
3c997079 153 int i;
4e3c1b9b
MD		 154
155 mutex_lock(&sessions_mutex);
8cdc1a81 156 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 157 if (!session)
d83004aa 158 goto err;
8cdc1a81
MD		 159 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
160 if (!session_priv)
161 goto err_free_session;
162 session->priv = session_priv;
163 session_priv->pub = session;
164
165 INIT_LIST_HEAD(&session_priv->chan);
166 INIT_LIST_HEAD(&session_priv->events);
167 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 168
169 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
170 GFP_KERNEL);
171 if (!metadata_cache)
8cdc1a81 172 goto err_free_session_private;
0ca42eb7 173 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 174 if (!metadata_cache->data)
175 goto err_free_cache;
176 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
177 kref_init(&metadata_cache->refcount);
92d9f5e6 178 mutex_init(&metadata_cache->lock);
8cdc1a81 179 session_priv->metadata_cache = metadata_cache;
d83004aa 180 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
8cdc1a81 181 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 182 sizeof(metadata_cache->uuid));
8cdc1a81 183 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 184 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
8cdc1a81
MD		 185 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
186 list_add(&session_priv->list, &sessions);
187
8c0393c3
MD		 188 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
189 goto tracker_alloc_error;
190 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
191 goto tracker_alloc_error;
192 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
193 goto tracker_alloc_error;
194 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
195 goto tracker_alloc_error;
196 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
197 goto tracker_alloc_error;
198 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
199 goto tracker_alloc_error;
200
4e3c1b9b 201 mutex_unlock(&sessions_mutex);
8cdc1a81 202
4e3c1b9b 203 return session;
d83004aa 204
8c0393c3
MD		 205tracker_alloc_error:
206 lttng_id_tracker_fini(&session->pid_tracker);
207 lttng_id_tracker_fini(&session->vpid_tracker);
208 lttng_id_tracker_fini(&session->uid_tracker);
209 lttng_id_tracker_fini(&session->vuid_tracker);
210 lttng_id_tracker_fini(&session->gid_tracker);
211 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 212err_free_cache:
213 kfree(metadata_cache);
8cdc1a81
MD		 214err_free_session_private:
215 lttng_kvfree(session_priv);
d83004aa 216err_free_session:
48f5e0b5 217 lttng_kvfree(session);
d83004aa
JD		 218err:
219 mutex_unlock(&sessions_mutex);
220 return NULL;
221}
222
99f52fcc
FD		 223static
224struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
225{
226 struct lttng_counter_transport *transport;
227
228 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
229 if (!strcmp(transport->name, name))
230 return transport;
231 }
232 return NULL;
233}
234
235struct lttng_counter *lttng_kernel_counter_create(
236 const char *counter_transport_name,
237 size_t number_dimensions, const size_t *dimensions_sizes)
238{
239 struct lttng_counter *counter = NULL;
240 struct lttng_counter_transport *counter_transport = NULL;
241
242 counter_transport = lttng_counter_transport_find(counter_transport_name);
243 if (!counter_transport) {
244 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
245 counter_transport_name);
246 goto notransport;
247 }
248 if (!try_module_get(counter_transport->owner)) {
249 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
250 goto notransport;
251 }
252
253 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
254 if (!counter)
255 goto nomem;
256
257 /* Create event notifier error counter. */
258 counter->ops = &counter_transport->ops;
259 counter->transport = counter_transport;
260
261 counter->counter = counter->ops->counter_create(
262 number_dimensions, dimensions_sizes, 0);
263 if (!counter->counter) {
264 goto create_error;
265 }
266
267 return counter;
268
269create_error:
270 lttng_kvfree(counter);
271nomem:
272 if (counter_transport)
273 module_put(counter_transport->owner);
274notransport:
275 return NULL;
276}
277
750b05f2
FD		 278struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
279{
280 struct lttng_transport *transport = NULL;
281 struct lttng_event_notifier_group *event_notifier_group;
282 const char *transport_name = "relay-event-notifier";
283 size_t subbuf_size = 4096; //TODO
284 size_t num_subbuf = 16; //TODO
285 unsigned int switch_timer_interval = 0;
286 unsigned int read_timer_interval = 0;
dffef45d 287 int i;
750b05f2
FD		 288
289 mutex_lock(&sessions_mutex);
290
291 transport = lttng_transport_find(transport_name);
292 if (!transport) {
293 printk(KERN_WARNING "LTTng: transport %s not found\n",
294 transport_name);
295 goto notransport;
296 }
297 if (!try_module_get(transport->owner)) {
298 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
299 transport_name);
300 goto notransport;
301 }
302
303 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
304 GFP_KERNEL);
305 if (!event_notifier_group)
306 goto nomem;
307
308 /*
309 * Initialize the ring buffer used to store event notifier
310 * notifications.
311 */
312 event_notifier_group->ops = &transport->ops;
4a399b76 313 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 314 transport_name, event_notifier_group, NULL,
315 subbuf_size, num_subbuf, switch_timer_interval,
316 read_timer_interval);
317 if (!event_notifier_group->chan)
318 goto create_error;
319
320 event_notifier_group->transport = transport;
dffef45d
FD		 321
322 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
323 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
33af697f
MD		 324 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
325 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
dffef45d 326
750b05f2
FD		 327 list_add(&event_notifier_group->node, &event_notifier_groups);
328
329 mutex_unlock(&sessions_mutex);
330
331 return event_notifier_group;
332
333create_error:
334 lttng_kvfree(event_notifier_group);
335nomem:
336 if (transport)
337 module_put(transport->owner);
338notransport:
339 mutex_unlock(&sessions_mutex);
340 return NULL;
341}
342
d83004aa
JD		 343void metadata_cache_destroy(struct kref *kref)
344{
345 struct lttng_metadata_cache *cache =
346 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 347 vfree(cache->data);
d83004aa 348 kfree(cache);
4e3c1b9b
MD		 349}
350
8cdc1a81 351void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 352{
f7d06400 353 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 354 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 355 struct lttng_metadata_stream *metadata_stream;
44b1abdc 356 struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler;
dda6a249 357 int ret;
4e3c1b9b
MD		 358
359 mutex_lock(&sessions_mutex);
a8f2d0c7 360 WRITE_ONCE(session->active, 0);
f7d06400 361 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 362 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 363 WARN_ON(ret);
364 }
f237aef8 365 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
f0bcc14c 366 ret = _lttng_event_unregister(&event_recorder_priv->pub->parent);
dda6a249
MD		 367 WARN_ON(ret);
368 }
abcca994 369 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400 370 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 371 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
badfe9f5
MD		 372 WARN_ON(ret);
373 }
44b1abdc 374 list_for_each_entry_safe(event_recorder_enabler, tmp_event_recorder_enabler,
8cdc1a81 375 &session->priv->enablers_head, node)
44b1abdc 376 lttng_event_enabler_destroy(&event_recorder_enabler->parent);
f237aef8 377 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node)
0648898e 378 _lttng_event_destroy(&event_recorder_priv->pub->parent);
f7d06400
MD		 379 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
380 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
381 _lttng_channel_destroy(chan_priv->pub);
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
6053e75e 412 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
8a8ac9a8
FD		 413 WARN_ON(ret);
414
a67ba386 415 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 416 &event_notifier_group->event_notifiers_head, parent.node) {
f0bcc14c 417 ret = _lttng_event_unregister(&event_notifier_priv->pub->parent);
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
6053e75e
MD		 426 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
427 WARN_ON(ret);
8a8ac9a8 428
dffef45d
FD		 429 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
430 &event_notifier_group->enablers_head, node)
44b1abdc 431 lttng_event_enabler_destroy(&event_notifier_enabler->parent);
dffef45d 432
a67ba386 433 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 434 &event_notifier_group->event_notifiers_head, parent.node)
0648898e 435 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 436
99f52fcc
FD		 437 if (event_notifier_group->error_counter) {
438 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 439
99f52fcc
FD		 440 error_counter->ops->counter_destroy(error_counter->counter);
441 module_put(error_counter->transport->owner);
442 lttng_kvfree(error_counter);
443 event_notifier_group->error_counter = NULL;
444 }
445
4a399b76 446 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 447 module_put(event_notifier_group->transport->owner);
448 list_del(&event_notifier_group->node);
dffef45d 449
750b05f2
FD		 450 mutex_unlock(&sessions_mutex);
451 lttng_kvfree(event_notifier_group);
452}
453
8cdc1a81 454int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 455{
456 int ret;
457
458 mutex_lock(&sessions_mutex);
459 ret = lttng_statedump_start(session);
460 mutex_unlock(&sessions_mutex);
461 return ret;
462}
463
8cdc1a81 464int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 465{
466 int ret = 0;
f7d06400 467 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 468
469 mutex_lock(&sessions_mutex);
470 if (session->active) {
471 ret = -EBUSY;
472 goto end;
473 }
c099397a 474
3c997079 475 /* Set transient enabler state to "enabled" */
8cdc1a81 476 session->priv->tstate = 1;
3c997079 477
4ef81e4a 478 /* We need to sync enablers with session before activation. */
b2bc0bc8 479 lttng_session_sync_event_enablers(session);
4ef81e4a 480
c099397a
MD		 481 /*
482 * Snapshot the number of events per channel to know the type of header
483 * we need to use.
484 */
f7d06400
MD		 485 list_for_each_entry(chan_priv, &session->priv->chan, node) {
486 if (chan_priv->header_type)
487 continue; /* don't change it if session stop/restart */
488 if (chan_priv->free_event_id < 31)
489 chan_priv->header_type = 1; /* compact */
c099397a 490 else
f7d06400 491 chan_priv->header_type = 2; /* large */
c099397a
MD		 492 }
493
64af2437 494 /* Clear each stream's quiescent state. */
f7d06400
MD		 495 list_for_each_entry(chan_priv, &session->priv->chan, node) {
496 if (chan_priv->channel_type != METADATA_CHANNEL)
497 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 498 }
64af2437 499
a8f2d0c7 500 WRITE_ONCE(session->active, 1);
8cdc1a81 501 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 502 ret = _lttng_session_metadata_statedump(session);
c337ddc2 503 if (ret) {
a8f2d0c7 504 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 505 goto end;
506 }
507 ret = lttng_statedump_start(session);
360f38ea 508 if (ret)
a8f2d0c7 509 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 510end:
511 mutex_unlock(&sessions_mutex);
11b5a3c2 512 return ret;
c0e31d2e
MD		 513}
514
8cdc1a81 515int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 516{
517 int ret = 0;
f7d06400 518 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 519
520 mutex_lock(&sessions_mutex);
521 if (!session->active) {
522 ret = -EBUSY;
523 goto end;
524 }
a8f2d0c7 525 WRITE_ONCE(session->active, 0);
3c997079
MD		 526
527 /* Set transient enabler state to "disabled" */
8cdc1a81 528 session->priv->tstate = 0;
b2bc0bc8 529 lttng_session_sync_event_enablers(session);
64af2437
MD		 530
531 /* Set each stream's quiescent state. */
f7d06400
MD		 532 list_for_each_entry(chan_priv, &session->priv->chan, node) {
533 if (chan_priv->channel_type != METADATA_CHANNEL)
534 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 535 }
c0e31d2e
MD		 536end:
537 mutex_unlock(&sessions_mutex);
11b5a3c2 538 return ret;
c0e31d2e
MD		 539}
540
8cdc1a81 541int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 542{
543 int ret = 0;
f7d06400 544 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 545 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 546 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 547 struct lttng_metadata_stream *stream;
548
549 mutex_lock(&sessions_mutex);
550 if (!session->active) {
551 ret = -EBUSY;
552 goto end;
553 }
554
555 mutex_lock(&cache->lock);
556 memset(cache->data, 0, cache->cache_alloc);
557 cache->metadata_written = 0;
558 cache->version++;
8cdc1a81 559 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 560 stream->metadata_out = 0;
561 stream->metadata_in = 0;
562 }
563 mutex_unlock(&cache->lock);
564
8cdc1a81 565 session->priv->metadata_dumped = 0;
f7d06400
MD		 566 list_for_each_entry(chan_priv, &session->priv->chan, node) {
567 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 568 }
569
f237aef8 570 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386 571 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 572 }
573
574 ret = _lttng_session_metadata_statedump(session);
575
576end:
577 mutex_unlock(&sessions_mutex);
578 return ret;
579}
580
6b757027
MD		 581static
582bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
583{
584 struct lttng_kernel_channel_buffer *chan_buf;
585
586 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
587 return false;
588 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
589 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
590 return true;
591 return false;
592}
593
594int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
e64957da 595{
3c997079 596 int ret = 0;
e64957da 597
3c997079 598 mutex_lock(&sessions_mutex);
6b757027 599 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 600 ret = -EPERM;
601 goto end;
602 }
6b757027 603 if (channel->enabled) {
3c997079
MD		 604 ret = -EEXIST;
605 goto end;
606 }
607 /* Set transient enabler state to "enabled" */
6b757027
MD		 608 channel->priv->tstate = 1;
609 lttng_session_sync_event_enablers(channel->session);
3c997079 610 /* Set atomically the state to "enabled" */
6b757027 611 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 612end:
613 mutex_unlock(&sessions_mutex);
614 return ret;
e64957da
MD		 615}
616
6b757027 617int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
e64957da 618{
3c997079 619 int ret = 0;
e64957da 620
3c997079 621 mutex_lock(&sessions_mutex);
6b757027 622 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 623 ret = -EPERM;
624 goto end;
625 }
6b757027 626 if (!channel->enabled) {
3c997079
MD		 627 ret = -EEXIST;
628 goto end;
629 }
630 /* Set atomically the state to "disabled" */
6b757027 631 WRITE_ONCE(channel->enabled, 0);
3c997079 632 /* Set transient enabler state to "enabled" */
6b757027
MD		 633 channel->priv->tstate = 0;
634 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 635end:
636 mutex_unlock(&sessions_mutex);
637 return ret;
e64957da
MD		 638}
639
9d993668 640int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 641{
3c997079 642 int ret = 0;
e64957da 643
3c997079 644 mutex_lock(&sessions_mutex);
9d993668
MD		 645 switch (event->type) {
646 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
647 {
648 struct lttng_kernel_event_recorder *event_recorder =
649 container_of(event, struct lttng_kernel_event_recorder, parent);
650
f7d06400 651 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 652 ret = -EPERM;
653 goto end;
654 }
a0493bef 655 break;
9d993668
MD		 656 }
657 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
658 switch (event->priv->instrumentation) {
659 case LTTNG_KERNEL_ABI_KRETPROBE:
660 ret = -EINVAL;
661 goto end;
662 default:
663 break;
664 }
a0493bef
MD		 665 break;
666 default:
9d993668 667 break;
a0493bef 668 }
e64957da 669
9d993668 670 if (event->enabled) {
3c997079
MD		 671 ret = -EEXIST;
672 goto end;
673 }
a67ba386 674 switch (event->priv->instrumentation) {
c190d76e
MJ		 675 case LTTNG_KERNEL_ABI_TRACEPOINT:
676 lttng_fallthrough;
606828e4 677 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 678 ret = -EINVAL;
679 break;
b4a75708 680
c190d76e
MJ		 681 case LTTNG_KERNEL_ABI_KPROBE:
682 lttng_fallthrough;
606828e4 683 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 684 WRITE_ONCE(event->enabled, 1);
a0493bef 685 break;
b4a75708 686
606828e4 687 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 688 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 689 break;
b4a75708 690
c190d76e
MJ		 691 case LTTNG_KERNEL_ABI_FUNCTION:
692 lttng_fallthrough;
693 case LTTNG_KERNEL_ABI_NOOP:
694 lttng_fallthrough;
a0493bef
MD		 695 default:
696 WARN_ON_ONCE(1);
697 ret = -EINVAL;
698 }
3c997079
MD		 699end:
700 mutex_unlock(&sessions_mutex);
701 return ret;
e64957da
MD		 702}
703
9d993668 704int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 705{
706 int ret = 0;
707
708 mutex_lock(&sessions_mutex);
9d993668
MD		 709 switch (event->type) {
710 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
711 {
712 struct lttng_kernel_event_recorder *event_recorder =
713 container_of(event, struct lttng_kernel_event_recorder, parent);
714
f7d06400 715 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 716 ret = -EPERM;
717 goto end;
718 }
b01155ba 719 break;
9d993668
MD		 720 }
721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
722 switch (event->priv->instrumentation) {
723 case LTTNG_KERNEL_ABI_KRETPROBE:
724 ret = -EINVAL;
725 goto end;
726 default:
727 break;
728 }
2b16f0c9 729 break;
dffef45d 730 default:
9d993668 731 break;
dffef45d 732 }
dffef45d 733
a67ba386 734 if (!event->enabled) {
dffef45d
FD		 735 ret = -EEXIST;
736 goto end;
737 }
a67ba386 738 switch (event->priv->instrumentation) {
c190d76e
MJ		 739 case LTTNG_KERNEL_ABI_TRACEPOINT:
740 lttng_fallthrough;
606828e4 741 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 742 ret = -EINVAL;
743 break;
b4a75708 744
c190d76e
MJ		 745 case LTTNG_KERNEL_ABI_KPROBE:
746 lttng_fallthrough;
606828e4 747 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 748 WRITE_ONCE(event->enabled, 0);
2b16f0c9 749 break;
b4a75708 750
9d993668
MD		 751 case LTTNG_KERNEL_ABI_KRETPROBE:
752 ret = lttng_kretprobes_event_enable_state(event, 0);
753 break;
754
c190d76e
MJ		 755 case LTTNG_KERNEL_ABI_FUNCTION:
756 lttng_fallthrough;
757 case LTTNG_KERNEL_ABI_NOOP:
758 lttng_fallthrough;
dffef45d
FD		 759 default:
760 WARN_ON_ONCE(1);
761 ret = -EINVAL;
762 }
763end:
764 mutex_unlock(&sessions_mutex);
765 return ret;
766}
767
4e252d1e 768struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 769 const char *transport_name,
770 void *buf_addr,
4e3c1b9b
MD		 771 size_t subbuf_size, size_t num_subbuf,
772 unsigned int switch_timer_interval,
d83004aa
JD		 773 unsigned int read_timer_interval,
774 enum channel_type channel_type)
4e3c1b9b 775{
f7d06400
MD		 776 struct lttng_kernel_channel_buffer *chan;
777 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 778 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 779
780 mutex_lock(&sessions_mutex);
8cdc1a81 781 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 782 goto active; /* Refuse to add channel to active session */
a90917c3 783 transport = lttng_transport_find(transport_name);
f3d01b96 784 if (!transport) {
5a15f70c 785 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 786 transport_name);
c0e31d2e 787 goto notransport;
f3d01b96 788 }
a33c9927 789 if (!try_module_get(transport->owner)) {
5a15f70c 790 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 791 goto notransport;
792 }
f7d06400 793 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 794 if (!chan)
c0e31d2e 795 goto nomem;
f7d06400
MD		 796 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
797 if (!chan_priv)
798 goto nomem_priv;
799 chan->priv = chan_priv;
800 chan_priv->pub = chan;
801 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
802 chan->parent.session = session;
803 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 804 chan->ops = &transport->ops;
125b4df4
MD		 805 /*
806 * Note: the channel creation op already writes into the packet
807 * headers. Therefore the "chan" information used as input
808 * should be already accessible.
809 */
f7d06400 810 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 811 chan, buf_addr, subbuf_size, num_subbuf,
812 switch_timer_interval, read_timer_interval);
f7d06400 813 if (!chan->priv->rb_chan)
f3d01b96 814 goto create_error;
f7d06400
MD		 815 chan->priv->parent.tstate = 1;
816 chan->parent.enabled = 1;
817 chan->priv->transport = transport;
818 chan->priv->channel_type = channel_type;
819 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 820 mutex_unlock(&sessions_mutex);
821 return chan;
822
f3d01b96 823create_error:
f7d06400
MD		 824 kfree(chan_priv);
825nomem_priv:
f3d01b96 826 kfree(chan);
c0e31d2e 827nomem:
a33c9927
MD		 828 if (transport)
829 module_put(transport->owner);
c0e31d2e 830notransport:
e5382b6d 831active:
4e3c1b9b
MD		 832 mutex_unlock(&sessions_mutex);
833 return NULL;
834}
835
836/*
d83004aa
JD		 837 * Only used internally at session destruction for per-cpu channels, and
838 * when metadata channel is released.
839 * Needs to be called with sessions mutex held.
4e3c1b9b 840 */
aa7c23a9 841static
f7d06400 842void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 843{
f7d06400
MD		 844 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
845 module_put(chan->priv->transport->owner);
846 list_del(&chan->priv->node);
847 lttng_kernel_destroy_context(chan->priv->ctx);
848 kfree(chan->priv);
4e3c1b9b
MD		 849 kfree(chan);
850}
851
f7d06400 852void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 853{
f7d06400 854 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 855
856 /* Protect the metadata cache with the sessions_mutex. */
857 mutex_lock(&sessions_mutex);
858 _lttng_channel_destroy(chan);
859 mutex_unlock(&sessions_mutex);
860}
861EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
862
863static
864void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
865{
866 stream->finalized = 1;
867 wake_up_interruptible(&stream->read_wait);
868}
869
a101fa10 870
e5382b6d
MD		 871/*
872 * Supports event creation while tracing session is active.
3c997079 873 * Needs to be called with sessions mutex held.
e5382b6d 874 */
83006ee0 875static
1ae083ba 876struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 877 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 878{
0def9170 879 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
def1e304 880 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
5b9817ae 881 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
def1e304 882 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
a67ba386
MD		 883 struct lttng_kernel_event_recorder *event_recorder;
884 struct lttng_kernel_event_recorder_private *event_recorder_priv;
19bef247 885 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 886 const char *event_name;
887 struct hlist_head *head;
3d084699 888 int ret;
4e3c1b9b 889
f7d06400 890 if (chan->priv->free_event_id == -1U) {
4cf0bf51 891 ret = -EMFILE;
e5382b6d 892 goto full;
abc0446a 893 }
3c997079
MD		 894
895 switch (itype) {
606828e4 896 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 897 event_name = event_desc->event_name;
3c997079 898 break;
b4a75708 899
c190d76e
MJ		 900 case LTTNG_KERNEL_ABI_KPROBE:
901 lttng_fallthrough;
902 case LTTNG_KERNEL_ABI_UPROBE:
903 lttng_fallthrough;
904 case LTTNG_KERNEL_ABI_KRETPROBE:
905 lttng_fallthrough;
606828e4 906 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 907 event_name = event_param->name;
908 break;
b4a75708 909
c190d76e
MJ		 910 case LTTNG_KERNEL_ABI_FUNCTION:
911 lttng_fallthrough;
912 case LTTNG_KERNEL_ABI_NOOP:
913 lttng_fallthrough;
3c997079
MD		 914 default:
915 WARN_ON_ONCE(1);
916 ret = -EINVAL;
917 goto type_error;
918 }
4a11ef1c 919
0def9170 920 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247
MD		 921 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
922 event_recorder_priv = container_of(event_priv, struct lttng_kernel_event_recorder_private, parent);
923
924 WARN_ON_ONCE(!event_priv->desc);
925 if (!strncmp(event_priv->desc->event_name, event_name,
606828e4 926 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 927 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 928 ret = -EEXIST;
929 goto exist;
abc0446a
MD		 930 }
931 }
3c997079 932
a67ba386
MD		 933 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
934 if (!event_recorder) {
4cf0bf51 935 ret = -ENOMEM;
4e3c1b9b 936 goto cache_error;
abc0446a 937 }
a67ba386
MD		 938 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
939 if (!event_recorder_priv) {
940 ret = -ENOMEM;
941 goto cache_private_error;
942 }
943 event_recorder_priv->pub = event_recorder;
944 event_recorder_priv->parent.pub = &event_recorder->parent;
945 event_recorder->priv = event_recorder_priv;
946 event_recorder->parent.priv = &event_recorder_priv->parent;
947 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
948
8a445457 949 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 950 event_recorder->chan = chan;
f7d06400 951 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 952 event_recorder->priv->parent.instrumentation = itype;
953 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
954 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 955
956 switch (itype) {
606828e4 957 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 958 /* Event will be enabled by enabler sync. */
a67ba386
MD		 959 event_recorder->parent.enabled = 0;
960 event_recorder->priv->parent.registered = 0;
961 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
962 if (!event_recorder->priv->parent.desc) {
4cf0bf51 963 ret = -ENOENT;
d3dbe23c 964 goto register_error;
abc0446a 965 }
3c997079
MD		 966 /* Populate lttng_event structure before event registration. */
967 smp_wmb();
baf20995 968 break;
b4a75708 969
606828e4 970 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 971 /*
972 * Needs to be explicitly enabled after creation, since
973 * we may want to apply filters.
974 */
a67ba386
MD		 975 event_recorder->parent.enabled = 0;
976 event_recorder->priv->parent.registered = 1;
3c997079
MD		 977 /*
978 * Populate lttng_event structure before event
979 * registration.
980 */
981 smp_wmb();
8bf17deb 982 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 983 event_param->u.kprobe.symbol_name,
984 event_param->u.kprobe.offset,
985 event_param->u.kprobe.addr,
6a35e5bd 986 &event_recorder->parent);
abc0446a 987 if (ret) {
4cf0bf51 988 ret = -EINVAL;
d6d808f3 989 goto register_error;
abc0446a 990 }
a67ba386 991 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 992 WARN_ON_ONCE(!ret);
d6d808f3 993 break;
b4a75708 994
606828e4 995 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 996 {
a67ba386
MD		 997 struct lttng_kernel_event_recorder *event_recorder_return;
998 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 999
1000 /* kretprobe defines 2 events */
a0493bef
MD		 1001 /*
1002 * Needs to be explicitly enabled after creation, since
1003 * we may want to apply filters.
1004 */
a67ba386
MD		 1005 event_recorder->parent.enabled = 0;
1006 event_recorder->priv->parent.registered = 1;
1007
1008 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
1009 if (!event_recorder_return) {
1010 ret = -ENOMEM;
1011 goto register_error;
1012 }
1013 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1014 if (!event_recorder_return_priv) {
1015 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1016 ret = -ENOMEM;
7371f44c 1017 goto register_error;
abc0446a 1018 }
a67ba386
MD		 1019 event_recorder_return_priv->pub = event_recorder_return;
1020 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1021 event_recorder_return->priv = event_recorder_return_priv;
1022 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1023 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1024
8a445457 1025 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 1026 event_recorder_return->chan = chan;
f7d06400 1027 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 1028 event_recorder_return->priv->parent.instrumentation = itype;
1029 event_recorder_return->parent.enabled = 0;
1030 event_recorder_return->priv->parent.registered = 1;
1031 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1032 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1033 /*
a90917c3 1034 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1035 */
1036 smp_wmb();
3c997079 1037 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1038 event_param->u.kretprobe.symbol_name,
1039 event_param->u.kretprobe.offset,
1040 event_param->u.kretprobe.addr,
eb6b47db 1041 &event_recorder->parent, &event_recorder_return->parent);
7371f44c 1042 if (ret) {
a67ba386
MD		 1043 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1044 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1045 ret = -EINVAL;
7371f44c
MD		 1046 goto register_error;
1047 }
1048 /* Take 2 refs on the module: one per event. */
a67ba386 1049 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1050 WARN_ON_ONCE(!ret);
a67ba386 1051 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1052 WARN_ON_ONCE(!ret);
f7d06400 1053 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1054 event_recorder_return);
abc0446a 1055 WARN_ON_ONCE(ret > 0);
7371f44c 1056 if (ret) {
a67ba386
MD		 1057 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1058 kmem_cache_free(event_recorder_cache, event_recorder_return);
1059 module_put(event_recorder_return->priv->parent.desc->owner);
1060 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1061 goto statedump_error;
1062 }
f237aef8 1063 list_add(&event_recorder_return->priv->parent.node, &chan->parent.session->priv->events);
7371f44c
MD		 1064 break;
1065 }
b4a75708 1066
606828e4 1067 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1068 /*
1069 * Needs to be explicitly enabled after creation, since
1070 * we may want to apply filters.
1071 */
a67ba386
MD		 1072 event_recorder->parent.enabled = 0;
1073 event_recorder->priv->parent.registered = 0;
1074 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1075 switch (event_param->u.syscall.entryexit) {
606828e4 1076 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1077 ret = -EINVAL;
1078 goto register_error;
606828e4 1079 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1080 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1081 break;
606828e4 1082 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1083 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1084 break;
1085 }
1086 switch (event_param->u.syscall.abi) {
606828e4 1087 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1088 ret = -EINVAL;
1089 goto register_error;
606828e4 1090 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1091 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1092 break;
606828e4 1093 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1094 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1095 break;
1096 }
a67ba386 1097 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1098 ret = -EINVAL;
259b6cb3 1099 goto register_error;
abc0446a 1100 }
1ec65de1 1101 break;
b4a75708 1102
606828e4 1103 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1104 /*
1105 * Needs to be explicitly enabled after creation, since
1106 * we may want to apply filters.
1107 */
a67ba386
MD		 1108 event_recorder->parent.enabled = 0;
1109 event_recorder->priv->parent.registered = 1;
3aed4dca 1110
a344f64b
FD		 1111 /*
1112 * Populate lttng_event structure before event
1113 * registration.
1114 */
1115 smp_wmb();
149b9a9d 1116
83b802dc 1117 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1118 event_param->u.uprobe.fd,
17806c46 1119 &event_recorder->parent);
149b9a9d
YB		 1120 if (ret)
1121 goto register_error;
a67ba386 1122 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1123 WARN_ON_ONCE(!ret);
1124 break;
b4a75708 1125
c190d76e
MJ		 1126 case LTTNG_KERNEL_ABI_FUNCTION:
1127 lttng_fallthrough;
1128 case LTTNG_KERNEL_ABI_NOOP:
1129 lttng_fallthrough;
baf20995
MD		 1130 default:
1131 WARN_ON_ONCE(1);
4cf0bf51 1132 ret = -EINVAL;
df07930b 1133 goto register_error;
baf20995 1134 }
f7d06400 1135 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1136 WARN_ON_ONCE(ret > 0);
1137 if (ret) {
c099397a 1138 goto statedump_error;
abc0446a 1139 }
19bef247 1140 hlist_add_head(&event_recorder->priv->parent.hlist_node, head);
f237aef8 1141 list_add(&event_recorder->priv->parent.node, &chan->parent.session->priv->events);
a67ba386 1142 return event_recorder;
4e3c1b9b 1143
c099397a 1144statedump_error:
259b6cb3 1145 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1146register_error:
a67ba386
MD		 1147 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1148cache_private_error:
1149 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1150cache_error:
1151exist:
3c997079 1152type_error:
e5382b6d 1153full:
4cf0bf51 1154 return ERR_PTR(ret);
4e3c1b9b
MD		 1155}
1156
83006ee0
MD		 1157static
1158struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler,
1bbb5b2d 1159 const struct lttng_kernel_event_desc *event_desc)
dffef45d 1160{
0def9170 1161 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
1bbb5b2d
MD		 1162 struct lttng_event_notifier_group *event_notifier_group = event_enabler->group;
1163 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
1164 uint64_t token = event_enabler->parent.user_token;
1165 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
a67ba386
MD		 1166 struct lttng_kernel_event_notifier *event_notifier;
1167 struct lttng_kernel_event_notifier_private *event_notifier_priv;
19bef247 1168 struct lttng_kernel_event_common_private *event_priv;
ab04d7b1 1169 struct lttng_counter *error_counter;
dffef45d
FD		 1170 const char *event_name;
1171 struct hlist_head *head;
1172 int ret;
1173
1174 switch (itype) {
606828e4 1175 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1176 event_name = event_desc->event_name;
b01155ba 1177 break;
b4a75708 1178
c190d76e
MJ		 1179 case LTTNG_KERNEL_ABI_KPROBE:
1180 lttng_fallthrough;
1181 case LTTNG_KERNEL_ABI_UPROBE:
1182 lttng_fallthrough;
606828e4 1183 case LTTNG_KERNEL_ABI_SYSCALL:
1bbb5b2d 1184 event_name = event_param->name;
2b16f0c9 1185 break;
b4a75708 1186
c190d76e
MJ		 1187 case LTTNG_KERNEL_ABI_KRETPROBE:
1188 lttng_fallthrough;
1189 case LTTNG_KERNEL_ABI_FUNCTION:
1190 lttng_fallthrough;
1191 case LTTNG_KERNEL_ABI_NOOP:
1192 lttng_fallthrough;
dffef45d
FD		 1193 default:
1194 WARN_ON_ONCE(1);
1195 ret = -EINVAL;
1196 goto type_error;
1197 }
1198
0def9170 1199 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247
MD		 1200 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
1201 event_notifier_priv = container_of(event_priv, struct lttng_kernel_event_notifier_private, parent);
1202
1203 WARN_ON_ONCE(!event_priv->desc);
1204 if (!strncmp(event_priv->desc->event_name, event_name,
606828e4 1205 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 1206 && event_notifier_group == event_notifier_priv->group
19bef247 1207 && token == event_priv->user_token) {
dffef45d
FD		 1208 ret = -EEXIST;
1209 goto exist;
1210 }
1211 }
1212
1213 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1214 if (!event_notifier) {
1215 ret = -ENOMEM;
1216 goto cache_error;
1217 }
a67ba386
MD		 1218 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1219 if (!event_notifier_priv) {
1220 ret = -ENOMEM;
1221 goto cache_private_error;
1222 }
1223 event_notifier_priv->pub = event_notifier;
1224 event_notifier_priv->parent.pub = &event_notifier->parent;
1225 event_notifier->priv = event_notifier_priv;
1226 event_notifier->parent.priv = &event_notifier_priv->parent;
1227 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1228
1229 event_notifier->priv->group = event_notifier_group;
1bbb5b2d
MD		 1230 event_notifier->priv->parent.user_token = event_enabler->parent.user_token;
1231 event_notifier->priv->error_counter_index = event_enabler->error_counter_index;
a67ba386
MD		 1232 event_notifier->priv->num_captures = 0;
1233 event_notifier->priv->parent.instrumentation = itype;
1234 event_notifier->notification_send = lttng_event_notifier_notification_send;
1235 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1236 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1237 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1238 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1239
1240 switch (itype) {
606828e4 1241 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1242 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1243 event_notifier->parent.enabled = 0;
1244 event_notifier->priv->parent.registered = 0;
1245 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1246 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1247 ret = -ENOENT;
1248 goto register_error;
1249 }
1250 /* Populate lttng_event_notifier structure before event registration. */
1251 smp_wmb();
1252 break;
b4a75708 1253
606828e4 1254 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1255 /*
1256 * Needs to be explicitly enabled after creation, since
1257 * we may want to apply filters.
1258 */
a67ba386
MD		 1259 event_notifier->parent.enabled = 0;
1260 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1261 /*
1262 * Populate lttng_event_notifier structure before event
1263 * registration.
1264 */
1265 smp_wmb();
1bbb5b2d
MD		 1266 ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name,
1267 event_param->u.kprobe.symbol_name,
1268 event_param->u.kprobe.offset,
1269 event_param->u.kprobe.addr,
6a35e5bd 1270 &event_notifier->parent);
2b16f0c9
FD		 1271 if (ret) {
1272 ret = -EINVAL;
1273 goto register_error;
1274 }
a67ba386 1275 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1276 WARN_ON_ONCE(!ret);
1277 break;
b4a75708 1278
606828e4 1279 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1280 /*
1281 * Needs to be explicitly enabled after creation, since
1282 * we may want to apply filters.
1283 */
a67ba386
MD		 1284 event_notifier->parent.enabled = 0;
1285 event_notifier->priv->parent.registered = 0;
1286 event_notifier->priv->parent.desc = event_desc;
1bbb5b2d 1287 switch (event_param->u.syscall.entryexit) {
606828e4 1288 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1289 ret = -EINVAL;
1290 goto register_error;
606828e4 1291 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1292 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1293 break;
606828e4 1294 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1295 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1296 break;
1297 }
1bbb5b2d 1298 switch (event_param->u.syscall.abi) {
606828e4 1299 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1300 ret = -EINVAL;
1301 goto register_error;
606828e4 1302 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1303 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1304 break;
606828e4 1305 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1306 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1307 break;
1308 }
1309
a67ba386 1310 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1311 ret = -EINVAL;
1312 goto register_error;
1313 }
1314 break;
b4a75708 1315
606828e4 1316 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1317 /*
1318 * Needs to be explicitly enabled after creation, since
1319 * we may want to apply filters.
1320 */
a67ba386
MD		 1321 event_notifier->parent.enabled = 0;
1322 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1323
1324 /*
1325 * Populate lttng_event_notifier structure before
1326 * event_notifier registration.
1327 */
1328 smp_wmb();
1329
1bbb5b2d
MD		 1330 ret = lttng_uprobes_register_event(event_param->name,
1331 event_param->u.uprobe.fd,
17806c46 1332 &event_notifier->parent);
9de67196
FD		 1333 if (ret)
1334 goto register_error;
a67ba386 1335 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1336 WARN_ON_ONCE(!ret);
1337 break;
b4a75708 1338
c190d76e
MJ		 1339 case LTTNG_KERNEL_ABI_KRETPROBE:
1340 lttng_fallthrough;
1341 case LTTNG_KERNEL_ABI_FUNCTION:
1342 lttng_fallthrough;
1343 case LTTNG_KERNEL_ABI_NOOP:
1344 lttng_fallthrough;
dffef45d
FD		 1345 default:
1346 WARN_ON_ONCE(1);
1347 ret = -EINVAL;
1348 goto register_error;
1349 }
1350
f237aef8 1351 list_add(&event_notifier->priv->parent.node, &event_notifier_group->event_notifiers_head);
19bef247 1352 hlist_add_head(&event_notifier->priv->parent.hlist_node, head);
99f52fcc
FD		 1353
1354 /*
1355 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1356 * bucket is currently in use. We trust it. The session lock
1357 * synchronizes against concurrent creation of the error
1358 * counter.
99f52fcc 1359 */
ab04d7b1
MD		 1360 error_counter = event_notifier_group->error_counter;
1361 if (error_counter) {
99f52fcc
FD		 1362 size_t dimension_index[1];
1363
1364 /*
1365 * Check that the index is within the boundary of the counter.
1366 */
a67ba386 1367 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1368 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1369 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1370 ret = -EINVAL;
1371 goto register_error;
1372 }
1373
a67ba386 1374 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1375 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1376 if (ret) {
1377 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1378 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1379 goto register_error;
1380 }
1381 }
1382
dffef45d
FD		 1383 return event_notifier;
1384
1385register_error:
a67ba386
MD		 1386 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1387cache_private_error:
dffef45d
FD		 1388 kmem_cache_free(event_notifier_cache, event_notifier);
1389cache_error:
1390exist:
1391type_error:
1392 return ERR_PTR(ret);
1393}
1394
83006ee0
MD		 1395struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1396 const struct lttng_kernel_event_desc *event_desc)
1397{
1398 switch (event_enabler->enabler_type) {
1399 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1400 {
1401 struct lttng_event_recorder_enabler *event_recorder_enabler =
1402 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1403 struct lttng_kernel_event_recorder *event_recorder;
1404
1405 event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc);
1406 if (!event_recorder)
1407 return NULL;
1408 return &event_recorder->parent;
1409 }
1410 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1411 {
1412 struct lttng_event_notifier_enabler *event_notifier_enabler =
1413 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1414 struct lttng_kernel_event_notifier *event_notifier;
1415
1416 event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc);
1417 if (!event_notifier)
1418 return NULL;
1419 return &event_notifier->parent;
1420 }
1421 default:
1422 return NULL;
1423 }
1424}
1425
1426struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1427 const struct lttng_kernel_event_desc *event_desc)
1428{
1429 struct lttng_kernel_event_common *event;
1430
1431 mutex_lock(&sessions_mutex);
1432 event = _lttng_kernel_event_create(event_enabler, event_desc);
1433 mutex_unlock(&sessions_mutex);
1434 return event;
1435}
1436
1437
1438
99f52fcc
FD		 1439int lttng_kernel_counter_read(struct lttng_counter *counter,
1440 const size_t *dim_indexes, int32_t cpu,
1441 int64_t *val, bool *overflow, bool *underflow)
1442{
1443 return counter->ops->counter_read(counter->counter, dim_indexes,
1444 cpu, val, overflow, underflow);
1445}
1446
1447int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1448 const size_t *dim_indexes, int64_t *val,
1449 bool *overflow, bool *underflow)
1450{
1451 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1452 val, overflow, underflow);
1453}
1454
1455int lttng_kernel_counter_clear(struct lttng_counter *counter,
1456 const size_t *dim_indexes)
1457{
1458 return counter->ops->counter_clear(counter->counter, dim_indexes);
1459}
1460
3c997079
MD		 1461/* Only used for tracepoints for now. */
1462static
0c851fa0 1463void register_event(struct lttng_kernel_event_common *event)
3c997079 1464{
437d5aa5 1465 const struct lttng_kernel_event_desc *desc;
f127e61e 1466 int ret = -EINVAL;
3c997079 1467
0c851fa0 1468 if (event->priv->registered)
3c997079 1469 return;
4ecb5ad5 1470
0c851fa0
MD		 1471 desc = event->priv->desc;
1472 switch (event->priv->instrumentation) {
606828e4 1473 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1474 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1475 desc->tp_class->probe_callback,
0c851fa0 1476 event);
4ecb5ad5 1477 break;
b4a75708 1478
606828e4 1479 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1480 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1481 break;
b4a75708 1482
c190d76e
MJ		 1483 case LTTNG_KERNEL_ABI_KPROBE:
1484 lttng_fallthrough;
1485 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1486 ret = 0;
f0bcc14c 1487 break;
0c851fa0
MD		 1488
1489 case LTTNG_KERNEL_ABI_KRETPROBE:
1490 switch (event->type) {
1491 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1492 ret = 0;
1493 break;
1494 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1495 WARN_ON_ONCE(1);
1496 break;
1497 }
4ecb5ad5 1498 break;
b4a75708 1499
c190d76e
MJ		 1500 case LTTNG_KERNEL_ABI_FUNCTION:
1501 lttng_fallthrough;
1502 case LTTNG_KERNEL_ABI_NOOP:
1503 lttng_fallthrough;
4ecb5ad5
MD		 1504 default:
1505 WARN_ON_ONCE(1);
1506 }
3c997079 1507 if (!ret)
0c851fa0 1508 event->priv->registered = 1;
3c997079
MD		 1509}
1510
f0bcc14c 1511int _lttng_event_unregister(struct lttng_kernel_event_common *event)
4e3c1b9b 1512{
f0bcc14c 1513 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1514 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1515 int ret = -EINVAL;
1516
a67ba386 1517 if (!event_priv->registered)
3c997079
MD		 1518 return 0;
1519
a67ba386
MD		 1520 desc = event_priv->desc;
1521 switch (event_priv->instrumentation) {
606828e4 1522 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1523 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1524 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1525 event);
baf20995 1526 break;
b4a75708 1527
606828e4 1528 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1529 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1530 ret = 0;
1531 break;
b4a75708 1532
606828e4 1533 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1534 switch (event->type) {
1535 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1536 lttng_kretprobes_unregister(event);
1537 ret = 0;
1538 break;
1539 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1540 WARN_ON_ONCE(1);
1541 break;
1542 }
7371f44c 1543 break;
b4a75708 1544
606828e4 1545 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1546 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1547 break;
b4a75708 1548
606828e4 1549 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1550 switch (event->type) {
1551 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1552 ret = 0;
1553 break;
1554 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1555 WARN_ON_ONCE(1);
1556 break;
1557 }
259b6cb3 1558 break;
b4a75708 1559
606828e4 1560 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1561 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1562 ret = 0;
1563 break;
b4a75708 1564
c190d76e
MJ		 1565 case LTTNG_KERNEL_ABI_FUNCTION:
1566 lttng_fallthrough;
baf20995
MD		 1567 default:
1568 WARN_ON_ONCE(1);
1569 }
3c997079 1570 if (!ret)
a67ba386 1571 event_priv->registered = 0;
dda6a249
MD		 1572 return ret;
1573}
1574
1575/*
1576 * Only used internally at session destruction.
1577 */
be066e6c 1578static
0648898e 1579void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1580{
0648898e 1581 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1582 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1583
0648898e
MD		 1584 lttng_free_event_filter_runtime(event);
1585 /* Free event enabler refs */
1586 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1587 &event_priv->enablers_ref_head, node)
1588 kfree(enabler_ref);
b4a75708 1589
0648898e
MD		 1590 switch (event->type) {
1591 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1592 {
1593 struct lttng_kernel_event_recorder *event_recorder =
1594 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1595
0648898e
MD		 1596 switch (event_priv->instrumentation) {
1597 case LTTNG_KERNEL_ABI_TRACEPOINT:
1598 lttng_event_desc_put(event_priv->desc);
1599 break;
b4a75708 1600
0648898e
MD		 1601 case LTTNG_KERNEL_ABI_KPROBE:
1602 module_put(event_priv->desc->owner);
6a35e5bd 1603 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1604 break;
b4a75708 1605
0648898e
MD		 1606 case LTTNG_KERNEL_ABI_KRETPROBE:
1607 module_put(event_priv->desc->owner);
eb6b47db 1608 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1609 break;
b4a75708 1610
0648898e
MD		 1611 case LTTNG_KERNEL_ABI_SYSCALL:
1612 break;
4e3c1b9b 1613
0648898e
MD		 1614 case LTTNG_KERNEL_ABI_UPROBE:
1615 module_put(event_priv->desc->owner);
17806c46 1616 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1617 break;
3ef5cc03 1618
c190d76e
MJ		 1619 case LTTNG_KERNEL_ABI_FUNCTION:
1620 lttng_fallthrough;
1621 case LTTNG_KERNEL_ABI_NOOP:
1622 lttng_fallthrough;
0648898e
MD		 1623 default:
1624 WARN_ON_ONCE(1);
1625 }
f237aef8 1626 list_del(&event_recorder->priv->parent.node);
0648898e
MD		 1627 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1628 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1629 break;
0648898e
MD		 1630 }
1631 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1632 {
1633 struct lttng_kernel_event_notifier *event_notifier =
1634 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1635
0648898e
MD		 1636 switch (event_notifier->priv->parent.instrumentation) {
1637 case LTTNG_KERNEL_ABI_TRACEPOINT:
1638 lttng_event_desc_put(event_notifier->priv->parent.desc);
1639 break;
b4a75708 1640
0648898e
MD		 1641 case LTTNG_KERNEL_ABI_KPROBE:
1642 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1643 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1644 break;
b4a75708 1645
0648898e
MD		 1646 case LTTNG_KERNEL_ABI_SYSCALL:
1647 break;
b4a75708 1648
0648898e
MD		 1649 case LTTNG_KERNEL_ABI_UPROBE:
1650 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1651 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1652 break;
1653
c190d76e
MJ		 1654 case LTTNG_KERNEL_ABI_KRETPROBE:
1655 lttng_fallthrough;
1656 case LTTNG_KERNEL_ABI_FUNCTION:
1657 lttng_fallthrough;
1658 case LTTNG_KERNEL_ABI_NOOP:
1659 lttng_fallthrough;
0648898e
MD		 1660 default:
1661 WARN_ON_ONCE(1);
1662 }
f237aef8 1663 list_del(&event_notifier->priv->parent.node);
0648898e
MD		 1664 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1665 kmem_cache_free(event_notifier_cache, event_notifier);
1666 break;
1667 }
dffef45d
FD		 1668 default:
1669 WARN_ON_ONCE(1);
1670 }
dffef45d
FD		 1671}
1672
8c0393c3 1673struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1674 enum tracker_type tracker_type)
e0130fab 1675{
d1f652f8
MD		 1676 switch (tracker_type) {
1677 case TRACKER_PID:
1678 return &session->pid_tracker;
1679 case TRACKER_VPID:
1680 return &session->vpid_tracker;
1681 case TRACKER_UID:
1682 return &session->uid_tracker;
1683 case TRACKER_VUID:
1684 return &session->vuid_tracker;
1685 case TRACKER_GID:
1686 return &session->gid_tracker;
1687 case TRACKER_VGID:
1688 return &session->vgid_tracker;
1689 default:
1690 WARN_ON_ONCE(1);
1691 return NULL;
1692 }
1693}
1694
8cdc1a81 1695int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1696 enum tracker_type tracker_type, int id)
1697{
8c0393c3 1698 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1699 int ret;
1700
d1f652f8
MD		 1701 tracker = get_tracker(session, tracker_type);
1702 if (!tracker)
1703 return -EINVAL;
1704 if (id < -1)
e0130fab
MD		 1705 return -EINVAL;
1706 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1707 if (id == -1) {
1708 /* track all ids: destroy tracker. */
1709 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1710 ret = 0;
1711 } else {
d1f652f8 1712 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1713 }
e0130fab
MD		 1714 mutex_unlock(&sessions_mutex);
1715 return ret;
1716}
1717
8cdc1a81 1718int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1719 enum tracker_type tracker_type, int id)
e0130fab 1720{
8c0393c3 1721 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1722 int ret;
1723
d1f652f8
MD		 1724 tracker = get_tracker(session, tracker_type);
1725 if (!tracker)
1726 return -EINVAL;
1727 if (id < -1)
e0130fab
MD		 1728 return -EINVAL;
1729 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1730 if (id == -1) {
1731 /* untrack all ids: replace by empty tracker. */
1732 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1733 } else {
d1f652f8 1734 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1735 }
e0130fab
MD		 1736 mutex_unlock(&sessions_mutex);
1737 return ret;
1738}
1739
7e6f9ef6 1740static
d1f652f8 1741void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1742{
8c0393c3
MD		 1743 struct lttng_kernel_id_tracker *id_tracker = m->private;
1744 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1745 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1746 int iter = 0, i;
1747
1748 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1749 if (id_tracker_p) {
1750 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1751 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1752
f934e302 1753 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1754 if (iter++ >= *pos)
1755 return e;
1756 }
1757 }
1758 } else {
d1f652f8 1759 /* ID tracker disabled. */
7e6f9ef6 1760 if (iter >= *pos && iter == 0) {
d1f652f8 1761 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1762 }
1763 iter++;
1764 }
1765 /* End of list */
1766 return NULL;
1767}
1768
1769/* Called with sessions_mutex held. */
1770static
d1f652f8 1771void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1772{
8c0393c3
MD		 1773 struct lttng_kernel_id_tracker *id_tracker = m->private;
1774 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1775 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1776 int iter = 0, i;
1777
1778 (*ppos)++;
d1f652f8
MD		 1779 if (id_tracker_p) {
1780 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1781 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1782
f934e302 1783 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1784 if (iter++ >= *ppos)
1785 return e;
1786 }
1787 }
1788 } else {
d1f652f8 1789 /* ID tracker disabled. */
7e6f9ef6 1790 if (iter >= *ppos && iter == 0)
d1f652f8 1791 return p; /* empty tracker */
7e6f9ef6
MD		 1792 iter++;
1793 }
1794
1795 /* End of list */
1796 return NULL;
1797}
1798
1799static
d1f652f8 1800void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1801{
1802 mutex_unlock(&sessions_mutex);
1803}
1804
1805static
d1f652f8 1806int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1807{
8c0393c3
MD		 1808 struct lttng_kernel_id_tracker *id_tracker = m->private;
1809 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1810 int id;
7e6f9ef6 1811
d1f652f8 1812 if (p == id_tracker_p) {
7e6f9ef6 1813 /* Tracker disabled. */
d1f652f8 1814 id = -1;
7e6f9ef6 1815 } else {
d1f652f8 1816 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1817
d1f652f8
MD		 1818 id = lttng_id_tracker_get_node_id(e);
1819 }
8c0393c3 1820 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1821 case TRACKER_PID:
1822 seq_printf(m, "process { pid = %d; };\n", id);
1823 break;
1824 case TRACKER_VPID:
1825 seq_printf(m, "process { vpid = %d; };\n", id);
1826 break;
1827 case TRACKER_UID:
1828 seq_printf(m, "user { uid = %d; };\n", id);
1829 break;
1830 case TRACKER_VUID:
1831 seq_printf(m, "user { vuid = %d; };\n", id);
1832 break;
1833 case TRACKER_GID:
1834 seq_printf(m, "group { gid = %d; };\n", id);
1835 break;
1836 case TRACKER_VGID:
1837 seq_printf(m, "group { vgid = %d; };\n", id);
1838 break;
1839 default:
1840 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1841 }
7e6f9ef6
MD		 1842 return 0;
1843}
1844
1845static
d1f652f8
MD		 1846const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1847 .start = id_list_start,
1848 .next = id_list_next,
1849 .stop = id_list_stop,
1850 .show = id_list_show,
7e6f9ef6
MD		 1851};
1852
1853static
d1f652f8 1854int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1855{
d1f652f8 1856 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1857}
1858
1859static
d1f652f8 1860int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1861{
1862 struct seq_file *m = file->private_data;
8c0393c3 1863 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1864 int ret;
1865
d1f652f8 1866 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1867 ret = seq_release(inode, file);
d1f652f8 1868 if (!ret)
8c0393c3 1869 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1870 return ret;
1871}
1872
d1f652f8 1873const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1874 .owner = THIS_MODULE,
d1f652f8 1875 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1876 .read = seq_read,
1877 .llseek = seq_lseek,
d1f652f8 1878 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1879};
1880
8cdc1a81 1881int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1882 enum tracker_type tracker_type)
7e6f9ef6 1883{
d1f652f8 1884 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1885 struct seq_file *m;
1886 int file_fd, ret;
1887
1888 file_fd = lttng_get_unused_fd();
1889 if (file_fd < 0) {
1890 ret = file_fd;
1891 goto fd_error;
1892 }
1893
d1f652f8
MD		 1894 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1895 &lttng_tracker_ids_list_fops,
7e6f9ef6 1896 NULL, O_RDWR);
d1f652f8
MD		 1897 if (IS_ERR(tracker_ids_list_file)) {
1898 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1899 goto file_error;
1900 }
8cdc1a81 1901 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1902 ret = -EOVERFLOW;
9c1f4643
MD		 1903 goto refcount_error;
1904 }
d1f652f8 1905 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1906 if (ret < 0)
1907 goto open_error;
d1f652f8
MD		 1908 m = tracker_ids_list_file->private_data;
1909
1910 m->private = get_tracker(session, tracker_type);
1911 BUG_ON(!m->private);
1912 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1913
1914 return file_fd;
1915
1916open_error:
8cdc1a81 1917 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1918refcount_error:
d1f652f8 1919 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1920file_error:
1921 put_unused_fd(file_fd);
1922fd_error:
1923 return ret;
1924}
1925
3c997079
MD		 1926/*
1927 * Enabler management.
1928 */
1929static
4993071a
PP		 1930int lttng_match_enabler_star_glob(const char *desc_name,
1931 const char *pattern)
3c997079 1932{
cbc19040
MD		 1933 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1934 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1935 return 0;
1936 return 1;
1937}
1938
1939static
4ecb5ad5
MD		 1940int lttng_match_enabler_name(const char *desc_name,
1941 const char *name)
3c997079 1942{
4ecb5ad5 1943 if (strcmp(desc_name, name))
3c997079
MD		 1944 return 0;
1945 return 1;
1946}
1947
8bff0fc3
MD		 1948static
1949int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
8d554755 1950 struct lttng_event_enabler_common *enabler)
3c997079 1951{
4ecb5ad5 1952 const char *desc_name, *enabler_name;
badfe9f5 1953 bool compat = false, entry = false;
4ecb5ad5
MD		 1954
1955 enabler_name = enabler->event_param.name;
1956 switch (enabler->event_param.instrumentation) {
606828e4 1957 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1958 desc_name = desc->event_name;
3b861b22
FD		 1959 switch (enabler->format_type) {
1960 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1961 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1962 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1963 return lttng_match_enabler_name(desc_name, enabler_name);
1964 default:
1965 return -EINVAL;
1966 }
4ecb5ad5 1967 break;
b4a75708 1968
606828e4 1969 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1970 desc_name = desc->event_name;
badfe9f5 1971 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1972 desc_name += strlen("compat_");
badfe9f5
MD		 1973 compat = true;
1974 }
4ecb5ad5
MD		 1975 if (!strncmp(desc_name, "syscall_exit_",
1976 strlen("syscall_exit_"))) {
1977 desc_name += strlen("syscall_exit_");
1978 } else if (!strncmp(desc_name, "syscall_entry_",
1979 strlen("syscall_entry_"))) {
1980 desc_name += strlen("syscall_entry_");
badfe9f5 1981 entry = true;
4ecb5ad5
MD		 1982 } else {
1983 WARN_ON_ONCE(1);
1984 return -EINVAL;
1985 }
badfe9f5 1986 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1987 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1988 break;
606828e4 1989 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1990 if (!entry)
1991 return 0;
1992 break;
606828e4 1993 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1994 if (entry)
1995 return 0;
1996 break;
1997 default:
1998 return -EINVAL;
1999 }
2000 switch (enabler->event_param.u.syscall.abi) {
606828e4 2001 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2002 break;
606828e4 2003 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2004 if (compat)
2005 return 0;
2006 break;
606828e4 2007 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2008 if (!compat)
2009 return 0;
2010 break;
2011 default:
2012 return -EINVAL;
2013 }
2014 switch (enabler->event_param.u.syscall.match) {
606828e4 2015 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2016 switch (enabler->format_type) {
2017 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2018 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2019 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2020 return lttng_match_enabler_name(desc_name, enabler_name);
2021 default:
2022 return -EINVAL;
2023 }
2024 break;
606828e4 2025 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2026 return -EINVAL; /* Not implemented. */
2027 default:
2028 return -EINVAL;
2029 }
4ecb5ad5 2030 break;
b4a75708 2031
4ecb5ad5
MD		 2032 default:
2033 WARN_ON_ONCE(1);
2034 return -EINVAL;
2035 }
3c997079
MD		 2036}
2037
8bff0fc3
MD		 2038bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
2039 struct lttng_event_enabler_common *enabler)
2040{
2041 int ret;
2042
2043 ret = lttng_desc_match_enabler_check(desc, enabler);
2044 if (ret < 0) {
2045 WARN_ON_ONCE(1);
2046 return false;
2047 }
2048 return ret;
2049}
2050
5c6ec66a
MD		 2051bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
2052 struct lttng_kernel_event_common *event)
3c997079 2053{
5c6ec66a
MD		 2054 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2055 return false;
b2bc0bc8 2056
5c6ec66a
MD		 2057 switch (event_enabler->enabler_type) {
2058 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2059 {
2060 struct lttng_event_recorder_enabler *event_recorder_enabler =
2061 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2062 struct lttng_kernel_event_recorder *event_recorder =
2063 container_of(event, struct lttng_kernel_event_recorder, parent);
2064
2065 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2066 && event_recorder->chan == event_recorder_enabler->chan)
2067 return true;
2068 else
2069 return false;
2070 }
2071 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2072 {
2073 struct lttng_event_notifier_enabler *event_notifier_enabler =
2074 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2075 struct lttng_kernel_event_notifier *event_notifier =
2076 container_of(event, struct lttng_kernel_event_notifier, parent);
2077
2078 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2079 && event_notifier->priv->group == event_notifier_enabler->group
2080 && event->priv->user_token == event_enabler->user_token)
2081 return true;
2082 else
2083 return false;
2084 }
2085 default:
2086 WARN_ON_ONCE(1);
2087 return false;
2088 }
3c997079
MD		 2089}
2090
5c6ec66a
MD		 2091bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
2092 const struct lttng_kernel_event_desc *desc,
2093 struct lttng_kernel_event_common *event)
b01155ba 2094{
5c6ec66a
MD		 2095 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2096 return false;
b01155ba 2097
5c6ec66a
MD		 2098 switch (event_enabler->enabler_type) {
2099 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2100 {
2101 struct lttng_event_recorder_enabler *event_recorder_enabler =
2102 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2103 struct lttng_kernel_event_recorder *event_recorder =
2104 container_of(event, struct lttng_kernel_event_recorder, parent);
2105
2106 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
2107 return true;
2108 else
2109 return false;
2110 }
2111 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2112 {
2113 struct lttng_event_notifier_enabler *event_notifier_enabler =
2114 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2115 struct lttng_kernel_event_notifier *event_notifier =
2116 container_of(event, struct lttng_kernel_event_notifier, parent);
2117
2118 if (event->priv->desc == desc
2119 && event_notifier->priv->group == event_notifier_enabler->group
2120 && event->priv->user_token == event_enabler->user_token)
2121 return true;
2122 else
2123 return false;
2124 }
2125 default:
2126 WARN_ON_ONCE(1);
2127 return false;
2128 }
b01155ba
FD		 2129}
2130
3c997079 2131static
b2bc0bc8
FD		 2132struct lttng_enabler_ref *lttng_enabler_ref(
2133 struct list_head *enablers_ref_list,
8d554755 2134 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2135{
2136 struct lttng_enabler_ref *enabler_ref;
2137
b2bc0bc8 2138 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2139 if (enabler_ref->ref == enabler)
2140 return enabler_ref;
2141 }
2142 return NULL;
2143}
2144
3c997079 2145static
c8e14380 2146void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common *event_enabler)
3c997079 2147{
c8e14380 2148 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
437d5aa5
MD		 2149 struct lttng_kernel_probe_desc *probe_desc;
2150 const struct lttng_kernel_event_desc *desc;
3c997079 2151 struct list_head *probe_list;
c8e14380 2152 int i;
3c997079
MD		 2153
2154 probe_list = lttng_get_probe_list_head();
2155 /*
2156 * For each probe event, if we find that a probe event matches
2157 * our enabler, create an associated lttng_event if not
2158 * already present.
2159 */
2160 list_for_each_entry(probe_desc, probe_list, head) {
2161 for (i = 0; i < probe_desc->nr_events; i++) {
2162 int found = 0;
2163 struct hlist_head *head;
83006ee0 2164 struct lttng_kernel_event_common *event;
19bef247 2165 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2166
2167 desc = probe_desc->event_desc[i];
c8e14380 2168 if (!lttng_desc_match_enabler(desc, event_enabler))
3c997079 2169 continue;
3c997079
MD		 2170
2171 /*
2172 * Check if already created.
2173 */
0def9170 2174 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2175 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
c8e14380 2176 if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub))
3c997079
MD		 2177 found = 1;
2178 }
2179 if (found)
2180 continue;
2181
2182 /*
83006ee0 2183 * We need to create an event for this event probe.
3c997079 2184 */
c8e14380 2185 event = _lttng_kernel_event_create(event_enabler, desc);
83006ee0 2186 if (!event) {
5a15f70c 2187 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2188 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2189 }
2190 }
2191 }
2192}
2193
33a39a3c 2194static
053554ae 2195void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c
MD		 2196{
2197 int ret;
2198
053554ae 2199 ret = lttng_syscalls_register_event(event_enabler);
8a8ac9a8 2200 WARN_ON_ONCE(ret);
8a8ac9a8
FD		 2201}
2202
33a39a3c 2203/*
8839618b 2204 * Create event if it is missing and present in the list of tracepoint probes.
33a39a3c
MD		 2205 * Should be called with sessions mutex held.
2206 */
2207static
8839618b 2208void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c 2209{
8839618b 2210 switch (event_enabler->event_param.instrumentation) {
606828e4 2211 case LTTNG_KERNEL_ABI_TRACEPOINT:
8839618b 2212 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2213 break;
b4a75708 2214
606828e4 2215 case LTTNG_KERNEL_ABI_SYSCALL:
8839618b 2216 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2217 break;
b4a75708 2218
33a39a3c
MD		 2219 default:
2220 WARN_ON_ONCE(1);
2221 break;
2222 }
2223}
2224
3c997079 2225/*
b2bc0bc8 2226 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2227 * and add backward reference from the event to the enabler.
2228 * Should be called with sessions mutex held.
2229 */
2230static
1ae083ba 2231int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2232{
f7d06400 2233 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
1ae083ba 2234 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
a67ba386 2235 struct lttng_kernel_event_recorder_private *event_recorder_priv;
546cb5f2 2236 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent);
3c997079 2237
606828e4
MD		 2238 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2239 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2240 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2241 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2242 int enabled = base_enabler->enabled;
606828e4 2243 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2244
606828e4 2245 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2246 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
3b82c4e1 2247
606828e4 2248 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2249 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
badfe9f5
MD		 2250 }
2251
3c997079 2252 /* First ensure that probe events are created for this enabler. */
8839618b 2253 lttng_create_event_if_missing(&event_enabler->parent);
3c997079 2254
b2bc0bc8 2255 /* For each event matching event_enabler in session event list. */
546cb5f2 2256 list_for_each_entry(event_recorder_priv, event_list_head, parent.node) {
a67ba386 2257 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2258 struct lttng_enabler_ref *enabler_ref;
2259
5c6ec66a 2260 if (!lttng_event_enabler_match_event(&event_enabler->parent, &event_recorder->parent))
3c997079 2261 continue;
a67ba386 2262 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
1ae083ba 2263 lttng_event_recorder_enabler_as_enabler(event_enabler));
3c997079
MD		 2264 if (!enabler_ref) {
2265 /*
2266 * If no backward ref, create it.
b2bc0bc8 2267 * Add backward ref from event to event_enabler.
3c997079
MD		 2268 */
2269 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2270 if (!enabler_ref)
2271 return -ENOMEM;
1ae083ba 2272 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
3c997079 2273 list_add(&enabler_ref->node,
a67ba386 2274 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2275 }
2276
f127e61e
MD		 2277 /*
2278 * Link filter bytecodes if not linked yet.
2279 */
a67ba386 2280 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2281 lttng_static_ctx,
a67ba386 2282 &event_recorder_priv->parent.filter_bytecode_runtime_head,
1ae083ba 2283 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2284 }
2285 return 0;
2286}
2287
b01155ba
FD		 2288/*
2289 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2290 */
2291static
8a8ac9a8
FD		 2292int lttng_event_notifier_enabler_ref_event_notifiers(
2293 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2294{
2295 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8d554755 2296 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2297 struct lttng_kernel_event_notifier_private *event_notifier_priv;
546cb5f2 2298 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_notifier_enabler->parent);
b01155ba 2299
606828e4
MD		 2300 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2301 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2302 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2303 !strcmp(base_enabler->event_param.name, "*")) {
2304
2305 int enabled = base_enabler->enabled;
606828e4 2306 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2307
606828e4 2308 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2309 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
8a8ac9a8 2310
606828e4 2311 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2312 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
8a8ac9a8
FD		 2313
2314 }
2315
b01155ba 2316 /* First ensure that probe event_notifiers are created for this enabler. */
8839618b 2317 lttng_create_event_if_missing(&event_notifier_enabler->parent);
b01155ba
FD		 2318
2319 /* Link the created event_notifier with its associated enabler. */
546cb5f2 2320 list_for_each_entry(event_notifier_priv, event_list_head, parent.node) {
a67ba386 2321 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2322 struct lttng_enabler_ref *enabler_ref;
2323
5c6ec66a 2324 if (!lttng_event_enabler_match_event(&event_notifier_enabler->parent, &event_notifier->parent))
b01155ba
FD		 2325 continue;
2326
a67ba386 2327 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2328 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2329 if (!enabler_ref) {
2330 /*
2331 * If no backward ref, create it.
2332 * Add backward ref from event_notifier to enabler.
2333 */
2334 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2335 if (!enabler_ref)
2336 return -ENOMEM;
2337
2338 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2339 event_notifier_enabler);
2340 list_add(&enabler_ref->node,
a67ba386 2341 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2342 }
2343
2344 /*
2345 * Link filter bytecodes if not linked yet.
2346 */
a67ba386
MD		 2347 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2348 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2349 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2350
2351 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2352 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2353 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2354 &event_notifier_enabler->capture_bytecode_head);
2355
a67ba386 2356 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2357 }
2358 return 0;
2359}
2360
3c997079
MD		 2361/*
2362 * Called at module load: connect the probe on all enablers matching
2363 * this event.
2364 * Called with sessions lock held.
2365 */
2366int lttng_fix_pending_events(void)
2367{
8cdc1a81 2368 struct lttng_kernel_session_private *session_priv;
3c997079 2369
8cdc1a81
MD		 2370 list_for_each_entry(session_priv, &sessions, list)
2371 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2372 return 0;
2373}
2374
b01155ba
FD		 2375static bool lttng_event_notifier_group_has_active_event_notifiers(
2376 struct lttng_event_notifier_group *event_notifier_group)
2377{
2378 struct lttng_event_notifier_enabler *event_notifier_enabler;
2379
2380 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2381 node) {
5b9817ae 2382 if (event_notifier_enabler->parent.enabled)
b01155ba
FD		 2383 return true;
2384 }
2385 return false;
2386}
2387
2388bool lttng_event_notifier_active(void)
2389{
2390 struct lttng_event_notifier_group *event_notifier_group;
2391
2392 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2393 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2394 return true;
2395 }
2396 return false;
2397}
2398
2399int lttng_fix_pending_event_notifiers(void)
2400{
2401 struct lttng_event_notifier_group *event_notifier_group;
2402
2403 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2404 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2405 return 0;
2406}
2407
1ae083ba 2408struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2409 enum lttng_enabler_format_type format_type,
606828e4 2410 struct lttng_kernel_abi_event *event_param,
f7d06400 2411 struct lttng_kernel_channel_buffer *chan)
3c997079 2412{
1ae083ba 2413 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2414
b2bc0bc8
FD		 2415 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2416 if (!event_enabler)
3c997079 2417 return NULL;
0bb716a8 2418 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2419 event_enabler->parent.format_type = format_type;
2420 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2421 memcpy(&event_enabler->parent.event_param, event_param,
2422 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2423 event_enabler->chan = chan;
3c997079 2424 /* ctx left NULL */
5b9817ae 2425 event_enabler->parent.enabled = 0;
def1e304
MD		 2426 return event_enabler;
2427}
2428
2429void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2430 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2431{
3c997079 2432 mutex_lock(&sessions_mutex);
def1e304
MD		 2433 list_add(&event_enabler->node, &session->priv->enablers_head);
2434 event_enabler->published = true;
2435 lttng_session_lazy_sync_event_enablers(session);
3c997079 2436 mutex_unlock(&sessions_mutex);
3c997079
MD		 2437}
2438
7b25ab0e 2439int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2440{
2441 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2442 event_enabler->enabled = 1;
2443 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2444 mutex_unlock(&sessions_mutex);
2445 return 0;
2446}
2447
7b25ab0e 2448int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2449{
2450 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2451 event_enabler->enabled = 0;
2452 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2453 mutex_unlock(&sessions_mutex);
2454 return 0;
2455}
2456
b2bc0bc8 2457static
8d554755 2458int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2459 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2460{
d64ca521 2461 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2462 uint32_t bytecode_len;
2463 int ret;
2464
2465 ret = get_user(bytecode_len, &bytecode->len);
2466 if (ret)
2467 return ret;
52cfcdf3 2468 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2469 GFP_KERNEL);
2470 if (!bytecode_node)
2471 return -ENOMEM;
2472 ret = copy_from_user(&bytecode_node->bc, bytecode,
2473 sizeof(*bytecode) + bytecode_len);
2474 if (ret)
2475 goto error_free;
b2bc0bc8 2476
8a445457 2477 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2478 bytecode_node->enabler = enabler;
2479 /* Enforce length based on allocated size */
2480 bytecode_node->bc.len = bytecode_len;
2481 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2482
07dfc1d0
MD		 2483 return 0;
2484
2485error_free:
52cfcdf3 2486 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2487 return ret;
2488}
2489
6048044f 2490int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2491 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2492{
2493 int ret;
6048044f 2494 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2495 if (ret)
2496 goto error;
7b25ab0e 2497 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2498 return 0;
2499
2500error:
2501 return ret;
2502}
2503
e2d5dbc7 2504int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2505 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2506{
2507
e2d5dbc7 2508 switch (event->priv->instrumentation) {
606828e4 2509 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2510 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2511 default:
2512 return -EINVAL;
2513 }
2514}
2515
3c997079 2516static
8d554755 2517void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2518{
d64ca521 2519 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2520
2521 /* Destroy filter bytecode */
2522 list_for_each_entry_safe(filter_node, tmp_filter_node,
2523 &enabler->filter_bytecode_head, node) {
52cfcdf3 2524 lttng_kvfree(filter_node);
07dfc1d0 2525 }
b2bc0bc8
FD		 2526}
2527
44b1abdc 2528void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2529{
44b1abdc
MD		 2530 switch (event_enabler->enabler_type) {
2531 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2532 {
2533 struct lttng_event_recorder_enabler *event_recorder_enabler =
2534 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2535
2536 lttng_enabler_destroy(event_enabler);
2537 if (event_recorder_enabler->published)
2538 list_del(&event_recorder_enabler->node);
2539 kfree(event_recorder_enabler);
2540 break;
2541 }
2542 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2543 {
2544 struct lttng_event_notifier_enabler *event_notifier_enabler =
2545 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2546
44b1abdc 2547 lttng_enabler_destroy(event_enabler);
1bbb5b2d
MD		 2548 if (event_notifier_enabler->published)
2549 list_del(&event_notifier_enabler->node);
44b1abdc
MD		 2550 kfree(event_notifier_enabler);
2551 break;
2552 }
2553 default:
2554 WARN_ON_ONCE(1);
2555 }
3c997079
MD		 2556}
2557
dffef45d 2558struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2559 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2560 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2561 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2562{
2563 struct lttng_event_notifier_enabler *event_notifier_enabler;
2564
2565 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2566 if (!event_notifier_enabler)
2567 return NULL;
2568
0bb716a8 2569 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2570 event_notifier_enabler->parent.format_type = format_type;
2571 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2572 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2573
99f52fcc 2574 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2575 event_notifier_enabler->num_captures = 0;
dffef45d 2576
5b9817ae
MD		 2577 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2578 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2579
5b9817ae
MD		 2580 event_notifier_enabler->parent.enabled = 0;
2581 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2582 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2583 return event_notifier_enabler;
2584}
dffef45d 2585
1bbb5b2d
MD		 2586void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2587 struct lttng_event_notifier_enabler *event_notifier_enabler)
2588{
dffef45d
FD		 2589 mutex_lock(&sessions_mutex);
2590 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
1bbb5b2d 2591 event_notifier_enabler->published = true;
b01155ba 2592 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2593 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2594}
2595
2596int lttng_event_notifier_enabler_enable(
2597 struct lttng_event_notifier_enabler *event_notifier_enabler)
2598{
2599 mutex_lock(&sessions_mutex);
2600 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2601 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2602 mutex_unlock(&sessions_mutex);
2603 return 0;
2604}
2605
2606int lttng_event_notifier_enabler_disable(
2607 struct lttng_event_notifier_enabler *event_notifier_enabler)
2608{
2609 mutex_lock(&sessions_mutex);
2610 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2611 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2612 mutex_unlock(&sessions_mutex);
2613 return 0;
2614}
2615
99d223ad
FD		 2616int lttng_event_notifier_enabler_attach_capture_bytecode(
2617 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2618 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2619{
d64ca521 2620 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2621 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2622 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2623 uint32_t bytecode_len;
2624 int ret;
2625
2626 ret = get_user(bytecode_len, &bytecode->len);
2627 if (ret)
2628 return ret;
2629
2630 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2631 GFP_KERNEL);
2632 if (!bytecode_node)
2633 return -ENOMEM;
2634
2635 ret = copy_from_user(&bytecode_node->bc, bytecode,
2636 sizeof(*bytecode) + bytecode_len);
2637 if (ret)
2638 goto error_free;
2639
8a445457 2640 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2641 bytecode_node->enabler = enabler;
2642
2643 /* Enforce length based on allocated size */
2644 bytecode_node->bc.len = bytecode_len;
2645 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2646
2647 event_notifier_enabler->num_captures++;
2648
2649 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2650 goto end;
2651
2652error_free:
2653 lttng_kvfree(bytecode_node);
2654end:
2655 return ret;
2656}
2657
3c997079 2658/*
b2bc0bc8 2659 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2660 * session.
2661 * Should be called with sessions mutex held.
2662 */
2663static
8cdc1a81 2664void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2665{
1ae083ba 2666 struct lttng_event_recorder_enabler *event_enabler;
a67ba386 2667 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2668
8cdc1a81 2669 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2670 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2671 /*
2672 * For each event, if at least one of its enablers is enabled,
2673 * and its channel and session transient states are enabled, we
2674 * enable the event, else we disable it.
2675 */
f237aef8 2676 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386 2677 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2678 struct lttng_enabler_ref *enabler_ref;
218585b9 2679 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2680 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2681 int nr_filters = 0;
3c997079 2682
a67ba386 2683 switch (event_recorder_priv->parent.instrumentation) {
c190d76e
MJ		 2684 case LTTNG_KERNEL_ABI_TRACEPOINT:
2685 lttng_fallthrough;
606828e4 2686 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2687 /* Enable events */
2688 list_for_each_entry(enabler_ref,
a67ba386 2689 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2690 if (enabler_ref->ref->enabled) {
2691 enabled = 1;
2692 break;
2693 }
2694 }
4ecb5ad5 2695 break;
b4a75708 2696
4ecb5ad5 2697 default:
3c997079
MD		 2698 /* Not handled with lazy sync. */
2699 continue;
2700 }
2701 /*
2702 * Enabled state is based on union of enablers, with
2703 * intesection of session and channel transient enable
2704 * states.
2705 */
f7d06400 2706 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2707
a67ba386 2708 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2709 /*
2710 * Sync tracepoint registration with event enabled
2711 * state.
2712 */
2713 if (enabled) {
0c851fa0 2714 register_event(&event_recorder->parent);
3c997079 2715 } else {
f0bcc14c 2716 _lttng_event_unregister(&event_recorder->parent);
3c997079 2717 }
07dfc1d0
MD		 2718
2719 /* Check if has enablers without bytecode enabled */
2720 list_for_each_entry(enabler_ref,
a67ba386 2721 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2722 if (enabler_ref->ref->enabled
2723 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2724 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2725 break;
2726 }
2727 }
a67ba386 2728 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2729 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2730
2731 /* Enable filters */
2732 list_for_each_entry(runtime,
e2d5dbc7 2733 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2734 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2735 nr_filters++;
2736 }
2737 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2738 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2739 }
2740}
2741
2742/*
2743 * Apply enablers to session events, adding events to session if need
2744 * be. It is required after each modification applied to an active
2745 * session, and right before session "start".
2746 * "lazy" sync means we only sync if required.
2747 * Should be called with sessions mutex held.
2748 */
2749static
8cdc1a81 2750void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2751{
2752 /* We can skip if session is not active */
2753 if (!session->active)
2754 return;
b2bc0bc8 2755 lttng_session_sync_event_enablers(session);
3c997079
MD		 2756}
2757
b01155ba
FD		 2758static
2759void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2760{
2761 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2762 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2763
2764 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2765 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2766
2767 /*
2768 * For each event_notifier, if at least one of its enablers is enabled,
2769 * we enable the event_notifier, else we disable it.
2770 */
f237aef8 2771 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, parent.node) {
a67ba386 2772 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2773 struct lttng_enabler_ref *enabler_ref;
218585b9 2774 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2775 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2776 int nr_filters = 0, nr_captures = 0;
b01155ba 2777
a67ba386 2778 switch (event_notifier_priv->parent.instrumentation) {
c190d76e
MJ		 2779 case LTTNG_KERNEL_ABI_TRACEPOINT:
2780 lttng_fallthrough;
606828e4 2781 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2782 /* Enable event_notifiers */
2783 list_for_each_entry(enabler_ref,
a67ba386 2784 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2785 if (enabler_ref->ref->enabled) {
2786 enabled = 1;
2787 break;
2788 }
2789 }
2790 break;
b4a75708 2791
b01155ba
FD		 2792 default:
2793 /* Not handled with sync. */
2794 continue;
2795 }
2796
a67ba386 2797 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2798 /*
2799 * Sync tracepoint registration with event_notifier enabled
2800 * state.
2801 */
2802 if (enabled) {
a67ba386 2803 if (!event_notifier_priv->parent.registered)
0c851fa0 2804 register_event(&event_notifier->parent);
b01155ba 2805 } else {
a67ba386 2806 if (event_notifier_priv->parent.registered)
f0bcc14c 2807 _lttng_event_unregister(&event_notifier->parent);
b01155ba
FD		 2808 }
2809
2810 /* Check if has enablers without bytecode enabled */
2811 list_for_each_entry(enabler_ref,
a67ba386 2812 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2813 if (enabler_ref->ref->enabled
2814 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2815 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2816 break;
2817 }
2818 }
a67ba386 2819 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2820 has_enablers_without_filter_bytecode;
b01155ba
FD		 2821
2822 /* Enable filters */
2823 list_for_each_entry(runtime,
e2d5dbc7 2824 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2825 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2826 nr_filters++;
2827 }
2828 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2829 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2830
2831 /* Enable captures */
2832 list_for_each_entry(runtime,
e2d5dbc7 2833 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2834 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2835 nr_captures++;
2836 }
2837 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2838 }
2839}
2840
7b25ab0e
MD		 2841static
2842void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2843{
2844 switch (event_enabler->enabler_type) {
2845 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2846 {
2847 struct lttng_event_recorder_enabler *event_recorder_enabler =
2848 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2849 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2850 break;
2851 }
2852 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2853 {
2854 struct lttng_event_notifier_enabler *event_notifier_enabler =
2855 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2856 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2857 break;
2858 }
2859 default:
2860 WARN_ON_ONCE(1);
2861 }
2862}
2863
1ec3f75a 2864/*
d83004aa
JD		 2865 * Serialize at most one packet worth of metadata into a metadata
2866 * channel.
92d9f5e6
MD		 2867 * We grab the metadata cache mutex to get exclusive access to our metadata
2868 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2869 * allows us to do racy operations such as looking for remaining space left in
2870 * packet and write, since mutual exclusion protects us from concurrent writes.
2871 * Mutual exclusion on the metadata cache allow us to read the cache content
2872 * without racing against reallocation of the cache by updates.
35097f36
JD		 2873 * Returns the number of bytes written in the channel, 0 if no data
2874 * was written and a negative value on error.
1ec3f75a 2875 */
b3b8072b 2876int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2877 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2878{
8a57ec02 2879 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2880 int ret = 0;
2881 size_t len, reserve_len;
2882
f613e3e6 2883 /*
92d9f5e6
MD		 2884 * Ensure we support mutiple get_next / put sequences followed by
2885 * put_next. The metadata cache lock protects reading the metadata
2886 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2887 * "flush" operations on the buffer invoked by different processes.
2888 * Moreover, since the metadata cache memory can be reallocated, we
2889 * need to have exclusive access against updates even though we only
2890 * read it.
f613e3e6 2891 */
92d9f5e6 2892 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2893 WARN_ON(stream->metadata_in < stream->metadata_out);
2894 if (stream->metadata_in != stream->metadata_out)
de23d59d 2895 goto end;
f613e3e6 2896
9616f0bf
JD		 2897 /* Metadata regenerated, change the version. */
2898 if (stream->metadata_cache->version != stream->version)
2899 stream->version = stream->metadata_cache->version;
2900
d83004aa 2901 len = stream->metadata_cache->metadata_written -
f613e3e6 2902 stream->metadata_in;
9de2c215 2903 if (!len)
de23d59d 2904 goto end;
d83004aa 2905 reserve_len = min_t(size_t,
4a399b76 2906 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2907 len);
a775608d 2908 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2909 sizeof(char), NULL);
d83004aa
JD		 2910 /*
2911 * If reservation failed, return an error to the caller.
2912 */
c2fb9c1c 2913 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2914 if (ret != 0) {
2915 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2916 stream->coherent = false;
d83004aa
JD		 2917 goto end;
2918 }
b3b8072b 2919 stream->transport->ops.event_write(&ctx,
f613e3e6 2920 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2921 reserve_len, 1);
b3b8072b 2922 stream->transport->ops.event_commit(&ctx);
f613e3e6 2923 stream->metadata_in += reserve_len;
3e75e2a7 2924 if (reserve_len < len)
8b97fd42
MD		 2925 stream->coherent = false;
2926 else
2927 stream->coherent = true;
d83004aa
JD		 2928 ret = reserve_len;
2929
2930end:
8b97fd42
MD		 2931 if (coherent)
2932 *coherent = stream->coherent;
92d9f5e6 2933 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2934 return ret;
2935}
2936
8b97fd42 2937static
8cdc1a81 2938void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2939{
8cdc1a81
MD		 2940 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2941 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2942}
2943
2944static
8cdc1a81 2945void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2946{
8cdc1a81
MD		 2947 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2948 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2949 struct lttng_metadata_stream *stream;
2950
8cdc1a81 2951 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2952 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2953 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2954 }
8b97fd42
MD		 2955}
2956
d83004aa
JD		 2957/*
2958 * Write the metadata to the metadata cache.
2959 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2960 * The metadata cache lock protects us from concurrent read access from
2961 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2962 * The content of the printf is printed as a single atomic metadata
2963 * transaction.
d83004aa 2964 */
8cdc1a81 2965int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2966 const char *fmt, ...)
2967{
c099397a 2968 char *str;
d83004aa 2969 size_t len;
c099397a
MD		 2970 va_list ap;
2971
585e5dcc 2972 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2973
2974 va_start(ap, fmt);
2975 str = kvasprintf(GFP_KERNEL, fmt, ap);
2976 va_end(ap);
2977 if (!str)
2978 return -ENOMEM;
2979
1ec3f75a 2980 len = strlen(str);
8cdc1a81
MD		 2981 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2982 if (session->priv->metadata_cache->metadata_written + len >
2983 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2984 char *tmp_cache_realloc;
2985 unsigned int tmp_cache_alloc_size;
2986
2987 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2988 session->priv->metadata_cache->cache_alloc + len,
2989 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2990 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2991 if (!tmp_cache_realloc)
2992 goto err;
8cdc1a81 2993 if (session->priv->metadata_cache->data) {
a606b6e8 2994 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 2995 session->priv->metadata_cache->data,
2996 session->priv->metadata_cache->cache_alloc);
2997 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 2998 }
2999
8cdc1a81
MD		 3000 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3001 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3002 }
8cdc1a81
MD		 3003 memcpy(session->priv->metadata_cache->data +
3004 session->priv->metadata_cache->metadata_written,
d83004aa 3005 str, len);
8cdc1a81 3006 session->priv->metadata_cache->metadata_written += len;
c099397a 3007 kfree(str);
d83004aa 3008
d83004aa
JD		 3009 return 0;
3010
3011err:
3012 kfree(str);
3013 return -ENOMEM;
c099397a
MD		 3014}
3015
f513b2bf 3016static
8cdc1a81 3017int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3018{
3019 size_t i;
3020
3021 for (i = 0; i < nesting; i++) {
3022 int ret;
3023
3024 ret = lttng_metadata_printf(session, " ");
3025 if (ret) {
3026 return ret;
3027 }
3028 }
3029 return 0;
3030}
3031
ceabb767 3032static
8cdc1a81 3033int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3034 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3035 size_t nesting)
3036{
3037 return lttng_metadata_printf(session, " _%s;\n", field->name);
3038}
3039
3040static
8cdc1a81 3041int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3042 const struct lttng_kernel_type_integer *type,
3043 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3044 size_t nesting)
3045{
3046 int ret;
3047
ceabb767
MD		 3048 ret = print_tabs(session, nesting);
3049 if (ret)
3050 return ret;
3051 ret = lttng_metadata_printf(session,
3052 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3053 type->size,
3054 type->alignment,
3055 type->signedness,
3056 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3057 ? "none"
437d5aa5 3058 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3059 ? "UTF8"
3060 : "ASCII",
437d5aa5 3061 type->base,
ceabb767 3062#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3063 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3064#else
437d5aa5 3065 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3066#endif
3067 );
3068 return ret;
3069}
3070
f513b2bf
MD		 3071/*
3072 * Must be called with sessions_mutex held.
3073 */
3074static
8cdc1a81 3075int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3076 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3077 size_t nesting)
3078{
51ef4536 3079 const char *prev_field_name = NULL;
f513b2bf
MD		 3080 int ret;
3081 uint32_t i, nr_fields;
ceabb767
MD		 3082 unsigned int alignment;
3083
f513b2bf
MD		 3084 ret = print_tabs(session, nesting);
3085 if (ret)
3086 return ret;
3087 ret = lttng_metadata_printf(session,
3088 "struct {\n");
3089 if (ret)
3090 return ret;
437d5aa5 3091 nr_fields = type->nr_fields;
f513b2bf 3092 for (i = 0; i < nr_fields; i++) {
437d5aa5 3093 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3094
437d5aa5 3095 iter_field = type->fields[i];
51ef4536 3096 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3097 if (ret)
3098 return ret;
3099 }
3100 ret = print_tabs(session, nesting);
3101 if (ret)
3102 return ret;
437d5aa5 3103 alignment = type->alignment;
ceabb767
MD		 3104 if (alignment) {
3105 ret = lttng_metadata_printf(session,
3106 "} align(%u)",
3107 alignment);
3108 } else {
3109 ret = lttng_metadata_printf(session,
3110 "}");
3111 }
f513b2bf
MD		 3112 return ret;
3113}
3114
3115/*
3116 * Must be called with sessions_mutex held.
3117 */
3118static
8cdc1a81 3119int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3120 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3121 size_t nesting)
3122{
3123 int ret;
3124
3125 ret = _lttng_struct_type_statedump(session,
437d5aa5 3126 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3127 if (ret)
3128 return ret;
ceabb767 3129 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3130}
3131
65c85aa6
MD		 3132/*
3133 * Must be called with sessions_mutex held.
3134 */
3135static
8cdc1a81 3136int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3137 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3138 size_t nesting,
3139 const char *prev_field_name)
65c85aa6 3140{
51ef4536 3141 const char *tag_name;
65c85aa6
MD		 3142 int ret;
3143 uint32_t i, nr_choices;
3144
51ef4536
MD		 3145 tag_name = type->tag_name;
3146 if (!tag_name)
3147 tag_name = prev_field_name;
3148 if (!tag_name)
3149 return -EINVAL;
ceabb767
MD		 3150 /*
3151 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3152 */
437d5aa5 3153 if (type->alignment != 0)
ceabb767 3154 return -EINVAL;
65c85aa6
MD		 3155 ret = print_tabs(session, nesting);
3156 if (ret)
3157 return ret;
3158 ret = lttng_metadata_printf(session,
3159 "variant <_%s> {\n",
51ef4536 3160 tag_name);
65c85aa6
MD		 3161 if (ret)
3162 return ret;
437d5aa5 3163 nr_choices = type->nr_choices;
65c85aa6 3164 for (i = 0; i < nr_choices; i++) {
437d5aa5 3165 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3166
437d5aa5 3167 iter_field = type->choices[i];
51ef4536 3168 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3169 if (ret)
3170 return ret;
3171 }
3172 ret = print_tabs(session, nesting);
3173 if (ret)
3174 return ret;
3175 ret = lttng_metadata_printf(session,
3176 "}");
3177 return ret;
3178}
3179
3180/*
3181 * Must be called with sessions_mutex held.
3182 */
3183static
8cdc1a81 3184int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3185 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3186 size_t nesting,
3187 const char *prev_field_name)
65c85aa6
MD		 3188{
3189 int ret;
3190
3191 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3192 lttng_kernel_get_type_variant(field->type), nesting,
3193 prev_field_name);
65c85aa6
MD		 3194 if (ret)
3195 return ret;
ceabb767 3196 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3197}
3198
f513b2bf
MD		 3199/*
3200 * Must be called with sessions_mutex held.
3201 */
3202static
8cdc1a81 3203int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3204 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3205 size_t nesting)
3206{
3207 int ret;
437d5aa5
MD		 3208 const struct lttng_kernel_type_array *array_type;
3209 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3210
437d5aa5
MD		 3211 array_type = lttng_kernel_get_type_array(field->type);
3212 WARN_ON_ONCE(!array_type);
ceabb767 3213
437d5aa5 3214 if (array_type->alignment) {
ceabb767 3215 ret = print_tabs(session, nesting);
f513b2bf
MD		 3216 if (ret)
3217 return ret;
ceabb767
MD		 3218 ret = lttng_metadata_printf(session,
3219 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3220 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3221 field->name);
3222 if (ret)
3223 return ret;
3224 }
3225 /*
3226 * Nested compound types: Only array of structures and variants are
3227 * currently supported.
3228 */
437d5aa5 3229 elem_type = array_type->elem_type;
12bb2edb
MD		 3230 switch (elem_type->type) {
3231 case lttng_kernel_type_integer:
437d5aa5
MD		 3232 case lttng_kernel_type_struct:
3233 case lttng_kernel_type_variant:
3234 ret = _lttng_type_statedump(session, elem_type,
3235 array_type->encoding, nesting);
65c85aa6
MD		 3236 if (ret)
3237 return ret;
3238 break;
ceabb767 3239
f513b2bf
MD		 3240 default:
3241 return -EINVAL;
3242 }
3243 ret = lttng_metadata_printf(session,
3244 " _%s[%u];\n",
3245 field->name,
437d5aa5 3246 array_type->length);
f513b2bf
MD		 3247 return ret;
3248}
3249
3250/*
3251 * Must be called with sessions_mutex held.
3252 */
3253static
8cdc1a81 3254int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3255 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3256 size_t nesting,
3257 const char *prev_field_name)
f513b2bf
MD		 3258{
3259 int ret;
3260 const char *length_name;
437d5aa5
MD		 3261 const struct lttng_kernel_type_sequence *sequence_type;
3262 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3263
437d5aa5
MD		 3264 sequence_type = lttng_kernel_get_type_sequence(field->type);
3265 WARN_ON_ONCE(!sequence_type);
f513b2bf 3266
437d5aa5 3267 length_name = sequence_type->length_name;
51ef4536
MD		 3268 if (!length_name)
3269 length_name = prev_field_name;
3270 if (!length_name)
3271 return -EINVAL;
ceabb767 3272
437d5aa5 3273 if (sequence_type->alignment) {
ceabb767 3274 ret = print_tabs(session, nesting);
f513b2bf
MD		 3275 if (ret)
3276 return ret;
ceabb767
MD		 3277 ret = lttng_metadata_printf(session,
3278 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3279 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3280 field->name);
3281 if (ret)
3282 return ret;
3283 }
3284
3285 /*
3286 * Nested compound types: Only array of structures and variants are
3287 * currently supported.
3288 */
437d5aa5 3289 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3290 switch (elem_type->type) {
3291 case lttng_kernel_type_integer:
437d5aa5
MD		 3292 case lttng_kernel_type_struct:
3293 case lttng_kernel_type_variant:
3294 ret = _lttng_type_statedump(session, elem_type,
3295 sequence_type->encoding, nesting);
65c85aa6
MD		 3296 if (ret)
3297 return ret;
3298 break;
ceabb767 3299
f513b2bf
MD		 3300 default:
3301 return -EINVAL;
3302 }
3303 ret = lttng_metadata_printf(session,
3304 " _%s[ _%s ];\n",
3305 field->name,
51ef4536 3306 length_name);
f513b2bf
MD		 3307 return ret;
3308}
3309
141ddf28
MD		 3310/*
3311 * Must be called with sessions_mutex held.
3312 */
3313static
8cdc1a81 3314int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3315 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3316 size_t nesting)
3317{
d96a4a7a 3318 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3319 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3320 int ret;
3321 unsigned int i, nr_entries;
3322
437d5aa5 3323 container_type = type->container_type;
12bb2edb 3324 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3325 ret = -EINVAL;
3326 goto end;
3327 }
437d5aa5 3328 enum_desc = type->desc;
141ddf28
MD		 3329 nr_entries = enum_desc->nr_entries;
3330
3331 ret = print_tabs(session, nesting);
3332 if (ret)
3333 goto end;
ceabb767
MD		 3334 ret = lttng_metadata_printf(session, "enum : ");
3335 if (ret)
3336 goto end;
437d5aa5
MD		 3337 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3338 lttng_kernel_string_encoding_none, 0);
141ddf28 3339 if (ret)
ceabb767
MD		 3340 goto end;
3341 ret = lttng_metadata_printf(session, " {\n");
3342 if (ret)
3343 goto end;
141ddf28
MD		 3344 /* Dump all entries */
3345 for (i = 0; i < nr_entries; i++) {
437d5aa5 3346 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3347 int j, len;
3348
3349 ret = print_tabs(session, nesting + 1);
3350 if (ret)
3351 goto end;
3352 ret = lttng_metadata_printf(session,
3353 "\"");
3354 if (ret)
3355 goto end;
3356 len = strlen(entry->string);
3357 /* Escape the character '"' */
3358 for (j = 0; j < len; j++) {
3359 char c = entry->string[j];
3360
3361 switch (c) {
3362 case '"':
3363 ret = lttng_metadata_printf(session,
3364 "\\\"");
3365 break;
3366 case '\\':
3367 ret = lttng_metadata_printf(session,
3368 "\\\\");
3369 break;
3370 default:
3371 ret = lttng_metadata_printf(session,
3372 "%c", c);
3373 break;
3374 }
3375 if (ret)
3376 goto end;
3377 }
08ad1061
PP		 3378 ret = lttng_metadata_printf(session, "\"");
3379 if (ret)
3380 goto end;
3381
3382 if (entry->options.is_auto) {
3383 ret = lttng_metadata_printf(session, ",\n");
3384 if (ret)
3385 goto end;
141ddf28 3386 } else {
7c559490
MD		 3387 ret = lttng_metadata_printf(session,
3388 " = ");
3389 if (ret)
3390 goto end;
3391 if (entry->start.signedness)
141ddf28 3392 ret = lttng_metadata_printf(session,
7c559490
MD		 3393 "%lld", (long long) entry->start.value);
3394 else
3395 ret = lttng_metadata_printf(session,
3396 "%llu", entry->start.value);
3397 if (ret)
3398 goto end;
3399 if (entry->start.signedness == entry->end.signedness &&
3400 entry->start.value
3401 == entry->end.value) {
141ddf28 3402 ret = lttng_metadata_printf(session,
7c559490
MD		 3403 ",\n");
3404 } else {
3405 if (entry->end.signedness) {
3406 ret = lttng_metadata_printf(session,
3407 " ... %lld,\n",
3408 (long long) entry->end.value);
3409 } else {
3410 ret = lttng_metadata_printf(session,
3411 " ... %llu,\n",
3412 entry->end.value);
3413 }
141ddf28 3414 }
7c559490
MD		 3415 if (ret)
3416 goto end;
141ddf28 3417 }
141ddf28
MD		 3418 }
3419 ret = print_tabs(session, nesting);
3420 if (ret)
3421 goto end;
ceabb767 3422 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3423end:
3424 return ret;
3425}
3426
d83004aa
JD		 3427/*
3428 * Must be called with sessions_mutex held.
3429 */
c099397a 3430static
8cdc1a81 3431int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3432 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3433 size_t nesting)
3434{
3435 int ret;
437d5aa5 3436 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3437
437d5aa5
MD		 3438 enum_type = lttng_kernel_get_type_enum(field->type);
3439 WARN_ON_ONCE(!enum_type);
3440 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3441 if (ret)
3442 return ret;
3443 return lttng_field_name_statedump(session, field, nesting);
3444}
3445
3446static
8cdc1a81 3447int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3448 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3449 size_t nesting)
3450{
3451 int ret;
3452
437d5aa5
MD		 3453 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3454 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3455 if (ret)
3456 return ret;
3457 return lttng_field_name_statedump(session, field, nesting);
3458}
3459
3460static
8cdc1a81 3461int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3462 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3463 size_t nesting)
3464{
3465 int ret;
3466
ceabb767
MD		 3467 /* Default encoding is UTF8 */
3468 ret = print_tabs(session, nesting);
3469 if (ret)
3470 return ret;
3471 ret = lttng_metadata_printf(session,
3472 "string%s",
437d5aa5 3473 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3474 " { encoding = ASCII; }" : "");
3475 return ret;
3476}
3477
3478static
8cdc1a81 3479int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3480 const struct lttng_kernel_event_field *field,
f513b2bf 3481 size_t nesting)
ceabb767 3482{
437d5aa5 3483 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3484 int ret;
3485
437d5aa5
MD		 3486 string_type = lttng_kernel_get_type_string(field->type);
3487 WARN_ON_ONCE(!string_type);
3488 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3489 if (ret)
3490 return ret;
3491 return lttng_field_name_statedump(session, field, nesting);
3492}
3493
3494/*
3495 * Must be called with sessions_mutex held.
3496 */
3497static
8cdc1a81 3498int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3499 const struct lttng_kernel_type_common *type,
3500 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3501 size_t nesting)
c099397a 3502{
c099397a 3503 int ret = 0;
c099397a 3504
12bb2edb
MD		 3505 switch (type->type) {
3506 case lttng_kernel_type_integer:
437d5aa5
MD		 3507 ret = _lttng_integer_type_statedump(session,
3508 lttng_kernel_get_type_integer(type),
3509 parent_encoding, nesting);
8070f5c0 3510 break;
437d5aa5
MD		 3511 case lttng_kernel_type_enum:
3512 ret = _lttng_enum_type_statedump(session,
3513 lttng_kernel_get_type_enum(type),
3514 nesting);
8070f5c0 3515 break;
12bb2edb 3516 case lttng_kernel_type_string:
437d5aa5
MD		 3517 ret = _lttng_string_type_statedump(session,
3518 lttng_kernel_get_type_string(type),
3519 nesting);
ceabb767 3520 break;
437d5aa5
MD		 3521 case lttng_kernel_type_struct:
3522 ret = _lttng_struct_type_statedump(session,
3523 lttng_kernel_get_type_struct(type),
3524 nesting);
8070f5c0 3525 break;
437d5aa5
MD		 3526 case lttng_kernel_type_variant:
3527 ret = _lttng_variant_type_statedump(session,
3528 lttng_kernel_get_type_variant(type),
51ef4536 3529 nesting, NULL);
ceabb767
MD		 3530 break;
3531
3532 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3533 case lttng_kernel_type_array:
3534 case lttng_kernel_type_sequence:
ceabb767
MD		 3535 default:
3536 WARN_ON_ONCE(1);
3537 return -EINVAL;
8070f5c0 3538 }
ceabb767
MD		 3539 return ret;
3540}
8070f5c0 3541
ceabb767
MD		 3542/*
3543 * Must be called with sessions_mutex held.
3544 */
3545static
8cdc1a81 3546int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3547 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3548 size_t nesting,
3549 const char **prev_field_name_p)
ceabb767 3550{
51ef4536 3551 const char *prev_field_name = NULL;
ceabb767 3552 int ret = 0;
27d2368e 3553
51ef4536
MD		 3554 if (prev_field_name_p)
3555 prev_field_name = *prev_field_name_p;
437d5aa5 3556 switch (field->type->type) {
12bb2edb 3557 case lttng_kernel_type_integer:
ceabb767
MD		 3558 ret = _lttng_integer_field_statedump(session, field, nesting);
3559 break;
437d5aa5 3560 case lttng_kernel_type_enum:
ceabb767 3561 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3562 break;
12bb2edb 3563 case lttng_kernel_type_string:
ceabb767 3564 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3565 break;
437d5aa5 3566 case lttng_kernel_type_struct:
ceabb767 3567 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3568 break;
437d5aa5 3569 case lttng_kernel_type_array:
ceabb767 3570 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3571 break;
437d5aa5 3572 case lttng_kernel_type_sequence:
51ef4536 3573 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3574 break;
437d5aa5 3575 case lttng_kernel_type_variant:
51ef4536 3576 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3577 break;
f513b2bf 3578
8070f5c0
MD		 3579 default:
3580 WARN_ON_ONCE(1);
3581 return -EINVAL;
3582 }
51ef4536
MD		 3583 if (prev_field_name_p)
3584 *prev_field_name_p = field->name;
8070f5c0
MD		 3585 return ret;
3586}
3587
3588static
8cdc1a81 3589int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3590 struct lttng_kernel_ctx *ctx)
8070f5c0 3591{
51ef4536 3592 const char *prev_field_name = NULL;
8070f5c0
MD		 3593 int ret = 0;
3594 int i;
3595
3596 if (!ctx)
3597 return 0;
3598 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3599 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3600
51ef4536 3601 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3602 if (ret)
3603 return ret;
3604 }
3605 return ret;
3606}
3607
3608static
8cdc1a81 3609int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3610 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3611{
51ef4536 3612 const char *prev_field_name = NULL;
a67ba386 3613 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3614 int ret = 0;
3615 int i;
3616
6c8c025b
MD		 3617 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3618 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3619
51ef4536 3620 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3621 if (ret)
3622 return ret;
c099397a
MD		 3623 }
3624 return ret;
3625}
3626
d83004aa
JD		 3627/*
3628 * Must be called with sessions_mutex held.
8b97fd42
MD		 3629 * The entire event metadata is printed as a single atomic metadata
3630 * transaction.
d83004aa 3631 */
c099397a 3632static
8cdc1a81 3633int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3634 struct lttng_kernel_channel_buffer *chan,
a67ba386 3635 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3636{
3637 int ret = 0;
3638
a67ba386 3639 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3640 return 0;
f7d06400 3641 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3642 return 0;
3643
8b97fd42
MD		 3644 lttng_metadata_begin(session);
3645
c099397a
MD		 3646 ret = lttng_metadata_printf(session,
3647 "event {\n"
ae734547 3648 " name = \"%s\";\n"
c099397a 3649 " id = %u;\n"
b9074a1b 3650 " stream_id = %u;\n",
a67ba386
MD		 3651 event_recorder->priv->parent.desc->event_name,
3652 event_recorder->priv->id,
f7d06400 3653 event_recorder->chan->priv->id);
c099397a
MD		 3654 if (ret)
3655 goto end;
3656
8070f5c0 3657 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3658 " fields := struct {\n"
3659 );
3660 if (ret)
3661 goto end;
3662
a67ba386 3663 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3664 if (ret)
3665 goto end;
3666
3667 /*
3668 * LTTng space reservation can only reserve multiples of the
3669 * byte size.
3670 */
3671 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3672 " };\n"
3673 "};\n\n");
c099397a
MD		 3674 if (ret)
3675 goto end;
3676
a67ba386 3677 event_recorder->priv->metadata_dumped = 1;
c099397a 3678end:
8b97fd42 3679 lttng_metadata_end(session);
c099397a
MD		 3680 return ret;
3681
3682}
3683
d83004aa
JD		 3684/*
3685 * Must be called with sessions_mutex held.
8b97fd42
MD		 3686 * The entire channel metadata is printed as a single atomic metadata
3687 * transaction.
d83004aa 3688 */
c099397a 3689static
8cdc1a81 3690int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3691 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3692{
3693 int ret = 0;
3694
f7d06400 3695 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3696 return 0;
d83004aa 3697
f7d06400 3698 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3699 return 0;
3700
8b97fd42
MD		 3701 lttng_metadata_begin(session);
3702
f7d06400 3703 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3704 ret = lttng_metadata_printf(session,
3705 "stream {\n"
3706 " id = %u;\n"
9115fbdc 3707 " event.header := %s;\n"
b9074a1b 3708 " packet.context := struct packet_context;\n",
f7d06400
MD		 3709 chan->priv->id,
3710 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3711 "struct event_header_large");
3712 if (ret)
3713 goto end;
3714
f7d06400 3715 if (chan->priv->ctx) {
b9074a1b
MD		 3716 ret = lttng_metadata_printf(session,
3717 " event.context := struct {\n");
3718 if (ret)
3719 goto end;
3720 }
f7d06400 3721 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3722 if (ret)
3723 goto end;
f7d06400 3724 if (chan->priv->ctx) {
b9074a1b
MD		 3725 ret = lttng_metadata_printf(session,
3726 " };\n");
3727 if (ret)
3728 goto end;
3729 }
8070f5c0
MD		 3730
3731 ret = lttng_metadata_printf(session,
b9074a1b 3732 "};\n\n");
8070f5c0 3733
f7d06400 3734 chan->priv->metadata_dumped = 1;
c099397a 3735end:
8b97fd42 3736 lttng_metadata_end(session);
c099397a
MD		 3737 return ret;
3738}
3739
d83004aa
JD		 3740/*
3741 * Must be called with sessions_mutex held.
3742 */
9115fbdc 3743static
8cdc1a81 3744int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3745{
3746 return lttng_metadata_printf(session,
3747 "struct packet_context {\n"
a3ccff4f
MD		 3748 " uint64_clock_monotonic_t timestamp_begin;\n"
3749 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3750 " uint64_t content_size;\n"
3751 " uint64_t packet_size;\n"
5b3cf4f9 3752 " uint64_t packet_seq_num;\n"
a9afe705 3753 " unsigned long events_discarded;\n"
9115fbdc 3754 " uint32_t cpu_id;\n"
c6dfdf6f 3755 "};\n\n"
9115fbdc
MD		 3756 );
3757}
3758
3759/*
3760 * Compact header:
3761 * id: range: 0 - 30.
3762 * id 31 is reserved to indicate an extended header.
3763 *
3764 * Large header:
3765 * id: range: 0 - 65534.
3766 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3767 *
3768 * Must be called with sessions_mutex held.
9115fbdc
MD		 3769 */
3770static
8cdc1a81 3771int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3772{
3773 return lttng_metadata_printf(session,
3774 "struct event_header_compact {\n"
3775 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3776 " variant <id> {\n"
3777 " struct {\n"
a3ccff4f 3778 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3779 " } compact;\n"
3780 " struct {\n"
3781 " uint32_t id;\n"
a3ccff4f 3782 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3783 " } extended;\n"
3784 " } v;\n"
3785 "} align(%u);\n"
3786 "\n"
3787 "struct event_header_large {\n"
3788 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3789 " variant <id> {\n"
3790 " struct {\n"
a3ccff4f 3791 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3792 " } compact;\n"
3793 " struct {\n"
3794 " uint32_t id;\n"
a3ccff4f 3795 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3796 " } extended;\n"
3797 " } v;\n"
3798 "} align(%u);\n\n",
a90917c3
MD		 3799 lttng_alignof(uint32_t) * CHAR_BIT,
3800 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3801 );
3802}
3803
a3ccff4f
MD		 3804 /*
3805 * Approximation of NTP time of day to clock monotonic correlation,
3806 * taken at start of trace.
3807 * Yes, this is only an approximation. Yes, we can (and will) do better
3808 * in future versions.
5283350b
MD		 3809 * This function may return a negative offset. It may happen if the
3810 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3811 *
3812 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3813 * y2038 compliant.
a3ccff4f
MD		 3814 */
3815static
8967b2a3 3816int64_t measure_clock_offset(void)
a3ccff4f 3817{
dcb93448 3818 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3819 uint64_t tcf = trace_clock_freq();
dcb93448 3820 int64_t offset;
a3ccff4f 3821 unsigned long flags;
3636085f
MJ		 3822#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3823 struct timespec64 rts = { 0, 0 };
3824#else
3825 struct timespec rts = { 0, 0 };
3826#endif
a3ccff4f
MD		 3827
3828 /* Disable interrupts to increase correlation precision. */
3829 local_irq_save(flags);
3830 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3831#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3832 ktime_get_real_ts64(&rts);
3833#else
216b6baa 3834 getnstimeofday(&rts);
3636085f 3835#endif
a3ccff4f
MD		 3836 monotonic[1] = trace_clock_read64();
3837 local_irq_restore(flags);
3838
dcb93448 3839 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3840 realtime = (uint64_t) rts.tv_sec * tcf;
3841 if (tcf == NSEC_PER_SEC) {
3842 realtime += rts.tv_nsec;
3843 } else {
3844 uint64_t n = rts.tv_nsec * tcf;
3845
3846 do_div(n, NSEC_PER_SEC);
3847 realtime += n;
3848 }
dcb93448 3849 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3850 return offset;
3851}
3852
3eb95be4 3853static
8cdc1a81 3854int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3855{
0f3eaad4 3856 int ret = 0;
3eb95be4
JR		 3857 size_t i;
3858 char cur;
3859
3860 i = 0;
3861 cur = string[i];
3862 while (cur != '\0') {
3863 switch (cur) {
3864 case '\n':
3865 ret = lttng_metadata_printf(session, "%s", "\\n");
3866 break;
3867 case '\\':
3868 case '"':
3869 ret = lttng_metadata_printf(session, "%c", '\\');
3870 if (ret)
3871 goto error;
3872 /* We still print the current char */
c190d76e 3873 lttng_fallthrough;
3eb95be4
JR		 3874 default:
3875 ret = lttng_metadata_printf(session, "%c", cur);
3876 break;
3877 }
3878
3879 if (ret)
3880 goto error;
3881
3882 cur = string[++i];
3883 }
3884error:
3885 return ret;
3886}
3887
3888static
8cdc1a81 3889int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3890 const char *field_value)
3eb95be4
JR		 3891{
3892 int ret;
3893
1c88f269 3894 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3895 if (ret)
3896 goto error;
3897
1c88f269 3898 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3899 if (ret)
3900 goto error;
3901
3902 ret = lttng_metadata_printf(session, "\";\n");
3903
3904error:
3905 return ret;
3906}
3907
c099397a
MD		 3908/*
3909 * Output metadata into this session's metadata buffers.
d83004aa 3910 * Must be called with sessions_mutex held.
c099397a
MD		 3911 */
3912static
8cdc1a81 3913int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3914{
8cdc1a81 3915 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3916 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3917 const char *product_uuid;
f7d06400 3918 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3919 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3920 int ret = 0;
3921
585e5dcc 3922 if (!LTTNG_READ_ONCE(session->active))
c099397a 3923 return 0;
8b97fd42
MD		 3924
3925 lttng_metadata_begin(session);
3926
8cdc1a81 3927 if (session->priv->metadata_dumped)
c099397a 3928 goto skip_session;
c099397a 3929
d793d5e1 3930 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3931 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3932 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3933 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3934 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3935 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3936
3937 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3938 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3939 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3940 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3941 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3942 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3943 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3944 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3945 "\n"
3946 "trace {\n"
3947 " major = %u;\n"
3948 " minor = %u;\n"
30bdb6e4 3949 " uuid = \"%s\";\n"
d793d5e1
MD		 3950 " byte_order = %s;\n"
3951 " packet.header := struct {\n"
3952 " uint32_t magic;\n"
1ec3f75a 3953 " uint8_t uuid[16];\n"
d793d5e1 3954 " uint32_t stream_id;\n"
5594698f 3955 " uint64_t stream_instance_id;\n"
0eb25f58 3956 " };\n"
d793d5e1 3957 "};\n\n",
a90917c3
MD		 3958 lttng_alignof(uint8_t) * CHAR_BIT,
3959 lttng_alignof(uint16_t) * CHAR_BIT,
3960 lttng_alignof(uint32_t) * CHAR_BIT,
3961 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3962 sizeof(unsigned long) * CHAR_BIT,
3963 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3964 CTF_SPEC_MAJOR,
3965 CTF_SPEC_MINOR,
d793d5e1 3966 uuid_s,
5214fa50 3967#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3968 "be"
3969#else
3970 "le"
3971#endif
3972 );
3973 if (ret)
3974 goto end;
3975
99dc9597
MD		 3976 ret = lttng_metadata_printf(session,
3977 "env {\n"
a6058143 3978 " hostname = \"%s\";\n"
c6c9e10f 3979 " domain = \"kernel\";\n"
99dc9597 3980 " sysname = \"%s\";\n"
c6c9e10f
MD		 3981 " kernel_release = \"%s\";\n"
3982 " kernel_version = \"%s\";\n"
3983 " tracer_name = \"lttng-modules\";\n"
3984 " tracer_major = %d;\n"
3985 " tracer_minor = %d;\n"
3986 " tracer_patchlevel = %d;\n"
3eb95be4 3987 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3988 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3989 utsname()->sysname,
3990 utsname()->release,
c6c9e10f
MD		 3991 utsname()->version,
3992 LTTNG_MODULES_MAJOR_VERSION,
3993 LTTNG_MODULES_MINOR_VERSION,
3994 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3995 );
3996 if (ret)
3997 goto end;
3998
8cdc1a81 3999 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4000 if (ret)
4001 goto end;
4002 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4003 session->priv->creation_time);
3eb95be4
JR		 4004 if (ret)
4005 goto end;
4006
c88f762e
GB		 4007 /* Add the product UUID to the 'env' section */
4008 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4009 if (product_uuid) {
4010 ret = lttng_metadata_printf(session,
4011 " product_uuid = \"%s\";\n",
4012 product_uuid
4013 );
4014 if (ret)
4015 goto end;
4016 }
4017
4018 /* Close the 'env' section */
3eb95be4
JR		 4019 ret = lttng_metadata_printf(session, "};\n\n");
4020 if (ret)
4021 goto end;
4022
a3ccff4f
MD		 4023 ret = lttng_metadata_printf(session,
4024 "clock {\n"
2754583e
MD		 4025 " name = \"%s\";\n",
4026 trace_clock_name()
a82c63f1
MD		 4027 );
4028 if (ret)
4029 goto end;
4030
4031 if (!trace_clock_uuid(clock_uuid_s)) {
4032 ret = lttng_metadata_printf(session,
7c27cb17 4033 " uuid = \"%s\";\n",
a82c63f1
MD		 4034 clock_uuid_s
4035 );
4036 if (ret)
4037 goto end;
4038 }
4039
4040 ret = lttng_metadata_printf(session,
2754583e 4041 " description = \"%s\";\n"
a3ccff4f
MD		 4042 " freq = %llu; /* Frequency, in Hz */\n"
4043 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4044 " offset = %lld;\n"
a3ccff4f 4045 "};\n\n",
2754583e 4046 trace_clock_description(),
a3ccff4f 4047 (unsigned long long) trace_clock_freq(),
8967b2a3 4048 (long long) measure_clock_offset()
a3ccff4f
MD		 4049 );
4050 if (ret)
4051 goto end;
4052
4053 ret = lttng_metadata_printf(session,
4054 "typealias integer {\n"
4055 " size = 27; align = 1; signed = false;\n"
2754583e 4056 " map = clock.%s.value;\n"
a3ccff4f
MD		 4057 "} := uint27_clock_monotonic_t;\n"
4058 "\n"
4059 "typealias integer {\n"
4060 " size = 32; align = %u; signed = false;\n"
2754583e 4061 " map = clock.%s.value;\n"
a3ccff4f
MD		 4062 "} := uint32_clock_monotonic_t;\n"
4063 "\n"
4064 "typealias integer {\n"
4065 " size = 64; align = %u; signed = false;\n"
2754583e 4066 " map = clock.%s.value;\n"
a3ccff4f 4067 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4068 trace_clock_name(),
a3ccff4f 4069 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4070 trace_clock_name(),
4071 lttng_alignof(uint64_t) * CHAR_BIT,
4072 trace_clock_name()
a3ccff4f
MD		 4073 );
4074 if (ret)
4075 goto end;
4076
a90917c3 4077 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4078 if (ret)
4079 goto end;
4080
a90917c3 4081 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4082 if (ret)
4083 goto end;
4084
c099397a 4085skip_session:
f7d06400
MD		 4086 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4087 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4088 if (ret)
4089 goto end;
4090 }
4091
f237aef8 4092 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386
MD		 4093 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4094 event_recorder_priv->pub);
c099397a
MD		 4095 if (ret)
4096 goto end;
4097 }
8cdc1a81 4098 session->priv->metadata_dumped = 1;
c099397a 4099end:
8b97fd42 4100 lttng_metadata_end(session);
c099397a
MD		 4101 return ret;
4102}
4103
c0e31d2e 4104/**
a90917c3 4105 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4106 * @transport: transport structure
4107 *
4108 * Registers a transport which can be used as output to extract the data out of
4109 * LTTng. The module calling this registration function must ensure that no
4110 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4111 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4112 * is made visible to the transport function. This registration acts as a
263b6c88 4113 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4114 * after its registration must it synchronize the TLBs.
4115 */
a90917c3 4116void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4117{
4118 /*
4119 * Make sure no page fault can be triggered by the module about to be
4120 * registered. We deal with this here so we don't have to call
263b6c88 4121 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4122 */
263b6c88 4123 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4124
4125 mutex_lock(&sessions_mutex);
a90917c3 4126 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4127 mutex_unlock(&sessions_mutex);
4128}
a90917c3 4129EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4130
4131/**
a90917c3 4132 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4133 * @transport: transport structure
4134 */
a90917c3 4135void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4136{
4137 mutex_lock(&sessions_mutex);
4138 list_del(&transport->node);
4139 mutex_unlock(&sessions_mutex);
4140}
a90917c3 4141EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4142
a101fa10
MD		 4143void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4144{
4145 /*
4146 * Make sure no page fault can be triggered by the module about to be
4147 * registered. We deal with this here so we don't have to call
4148 * vmalloc_sync_mappings() in each module's init.
4149 */
4150 wrapper_vmalloc_sync_mappings();
4151
4152 mutex_lock(&sessions_mutex);
4153 list_add_tail(&transport->node, &lttng_counter_transport_list);
4154 mutex_unlock(&sessions_mutex);
4155}
4156EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4157
4158void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4159{
4160 mutex_lock(&sessions_mutex);
4161 list_del(&transport->node);
4162 mutex_unlock(&sessions_mutex);
4163}
4164EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4165
5f4c791e 4166#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4167
4168enum cpuhp_state lttng_hp_prepare;
4169enum cpuhp_state lttng_hp_online;
4170
4171static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4172{
4173 struct lttng_cpuhp_node *lttng_node;
4174
4175 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4176 switch (lttng_node->component) {
4177 case LTTNG_RING_BUFFER_FRONTEND:
4178 return 0;
4179 case LTTNG_RING_BUFFER_BACKEND:
4180 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4181 case LTTNG_RING_BUFFER_ITER:
4182 return 0;
4183 case LTTNG_CONTEXT_PERF_COUNTERS:
4184 return 0;
4185 default:
4186 return -EINVAL;
4187 }
4188}
4189
4190static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4191{
4192 struct lttng_cpuhp_node *lttng_node;
4193
4194 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4195 switch (lttng_node->component) {
4196 case LTTNG_RING_BUFFER_FRONTEND:
4197 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4198 case LTTNG_RING_BUFFER_BACKEND:
4199 return 0;
4200 case LTTNG_RING_BUFFER_ITER:
4201 return 0;
4202 case LTTNG_CONTEXT_PERF_COUNTERS:
4203 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4204 default:
4205 return -EINVAL;
4206 }
4207}
4208
4209static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4210{
4211 struct lttng_cpuhp_node *lttng_node;
4212
4213 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4214 switch (lttng_node->component) {
4215 case LTTNG_RING_BUFFER_FRONTEND:
4216 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4217 case LTTNG_RING_BUFFER_BACKEND:
4218 return 0;
4219 case LTTNG_RING_BUFFER_ITER:
4220 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4221 case LTTNG_CONTEXT_PERF_COUNTERS:
4222 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4223 default:
4224 return -EINVAL;
4225 }
4226}
4227
4228static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4229{
4230 struct lttng_cpuhp_node *lttng_node;
4231
4232 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4233 switch (lttng_node->component) {
4234 case LTTNG_RING_BUFFER_FRONTEND:
4235 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4236 case LTTNG_RING_BUFFER_BACKEND:
4237 return 0;
4238 case LTTNG_RING_BUFFER_ITER:
4239 return 0;
4240 case LTTNG_CONTEXT_PERF_COUNTERS:
4241 return 0;
4242 default:
4243 return -EINVAL;
4244 }
4245}
4246
4247static int __init lttng_init_cpu_hotplug(void)
4248{
4249 int ret;
4250
4251 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4252 lttng_hotplug_prepare,
4253 lttng_hotplug_dead);
4254 if (ret < 0) {
4255 return ret;
4256 }
4257 lttng_hp_prepare = ret;
4258 lttng_rb_set_hp_prepare(ret);
4259
4260 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4261 lttng_hotplug_online,
4262 lttng_hotplug_offline);
4263 if (ret < 0) {
4264 cpuhp_remove_multi_state(lttng_hp_prepare);
4265 lttng_hp_prepare = 0;
4266 return ret;
4267 }
4268 lttng_hp_online = ret;
4269 lttng_rb_set_hp_online(ret);
4270
4271 return 0;
4272}
4273
4274static void __exit lttng_exit_cpu_hotplug(void)
4275{
4276 lttng_rb_set_hp_online(0);
4277 cpuhp_remove_multi_state(lttng_hp_online);
4278 lttng_rb_set_hp_prepare(0);
4279 cpuhp_remove_multi_state(lttng_hp_prepare);
4280}
4281
5f4c791e 4282#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4283static int lttng_init_cpu_hotplug(void)
4284{
4285 return 0;
4286}
4287static void lttng_exit_cpu_hotplug(void)
4288{
4289}
5f4c791e 4290#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4291
a90917c3 4292static int __init lttng_events_init(void)
4e3c1b9b 4293{
1c25284c
MD		 4294 int ret;
4295
453b2495
JD		 4296 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4297 if (ret)
4298 return ret;
389d7070 4299 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4300 if (ret)
4301 return ret;
4302 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4303 if (ret)
4304 return ret;
4305 ret = lttng_probes_init();
389d7070
MD		 4306 if (ret)
4307 return ret;
07dfc1d0 4308 ret = lttng_context_init();
20591cf7
MD		 4309 if (ret)
4310 return ret;
07dfc1d0
MD		 4311 ret = lttng_tracepoint_init();
4312 if (ret)
4313 goto error_tp;
a67ba386
MD		 4314 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4315 if (!event_recorder_cache) {
20591cf7 4316 ret = -ENOMEM;
a67ba386 4317 goto error_kmem_event_recorder;
dffef45d 4318 }
a67ba386
MD		 4319 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4320 if (!event_recorder_private_cache) {
4321 ret = -ENOMEM;
4322 goto error_kmem_event_recorder_private;
4323 }
4324 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4325 if (!event_notifier_cache) {
4326 ret = -ENOMEM;
4327 goto error_kmem_event_notifier;
20591cf7 4328 }
a67ba386
MD		 4329 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4330 if (!event_notifier_private_cache) {
4331 ret = -ENOMEM;
4332 goto error_kmem_event_notifier_private;
4333 }
80996790 4334 ret = lttng_abi_init();
02119ee5
MD		 4335 if (ret)
4336 goto error_abi;
0c956676
MD		 4337 ret = lttng_logger_init();
4338 if (ret)
4339 goto error_logger;
1e367326
MD		 4340 ret = lttng_init_cpu_hotplug();
4341 if (ret)
4342 goto error_hotplug;
101215b7 4343 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4344 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4345 __stringify(LTTNG_MODULES_MINOR_VERSION),
4346 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4347 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4348 LTTNG_VERSION_NAME,
4349#ifdef LTTNG_EXTRA_VERSION_GIT
4350 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4351#else
4352 "",
4353#endif
4354#ifdef LTTNG_EXTRA_VERSION_NAME
4355 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4356#else
4357 "");
4358#endif
c1551e57
MJ		 4359#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4360 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4361#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4362 return 0;
0c956676 4363
1e367326
MD		 4364error_hotplug:
4365 lttng_logger_exit();
0c956676
MD		 4366error_logger:
4367 lttng_abi_exit();
02119ee5 4368error_abi:
a67ba386
MD		 4369 kmem_cache_destroy(event_notifier_private_cache);
4370error_kmem_event_notifier_private:
dffef45d
FD		 4371 kmem_cache_destroy(event_notifier_cache);
4372error_kmem_event_notifier:
a67ba386
MD		 4373 kmem_cache_destroy(event_recorder_private_cache);
4374error_kmem_event_recorder_private:
4375 kmem_cache_destroy(event_recorder_cache);
4376error_kmem_event_recorder:
20591cf7 4377 lttng_tracepoint_exit();
07dfc1d0
MD		 4378error_tp:
4379 lttng_context_exit();
101215b7 4380 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4381 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4382 __stringify(LTTNG_MODULES_MINOR_VERSION),
4383 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4384 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4385 LTTNG_VERSION_NAME,
4386#ifdef LTTNG_EXTRA_VERSION_GIT
4387 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4388#else
4389 "",
4390#endif
4391#ifdef LTTNG_EXTRA_VERSION_NAME
4392 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4393#else
4394 "");
4395#endif
1c25284c 4396 return ret;
4e3c1b9b
MD		 4397}
4398
a90917c3 4399module_init(lttng_events_init);
11b5a3c2 4400
a90917c3 4401static void __exit lttng_events_exit(void)
4e3c1b9b 4402{
8cdc1a81 4403 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4404
1e367326 4405 lttng_exit_cpu_hotplug();
0c956676 4406 lttng_logger_exit();
80996790 4407 lttng_abi_exit();
8cdc1a81
MD		 4408 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4409 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4410 kmem_cache_destroy(event_recorder_cache);
4411 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4412 kmem_cache_destroy(event_notifier_cache);
a67ba386 4413 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4414 lttng_tracepoint_exit();
07dfc1d0 4415 lttng_context_exit();
101215b7 4416 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4417 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4418 __stringify(LTTNG_MODULES_MINOR_VERSION),
4419 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4420 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4421 LTTNG_VERSION_NAME,
4422#ifdef LTTNG_EXTRA_VERSION_GIT
4423 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4424#else
4425 "",
4426#endif
4427#ifdef LTTNG_EXTRA_VERSION_NAME
4428 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4429#else
4430 "");
4431#endif
4e3c1b9b 4432}
92e94819 4433
a90917c3 4434module_exit(lttng_events_exit);
11b5a3c2 4435
7ca11e77 4436#include <generated/patches.h>
101215b7
MJ		 4437#ifdef LTTNG_EXTRA_VERSION_GIT
4438MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4439#endif
4440#ifdef LTTNG_EXTRA_VERSION_NAME
4441MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4442#endif
92e94819
MD		 4443MODULE_LICENSE("GPL and additional rights");
4444MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4445MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4446MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4447 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4448 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4449 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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