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Refactoring: combine _lttng_event_unregister common code
[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);
324 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
325 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
326
750b05f2
FD		 327 list_add(&event_notifier_group->node, &event_notifier_groups);
328
329 mutex_unlock(&sessions_mutex);
330
331 return event_notifier_group;
332
333create_error:
334 lttng_kvfree(event_notifier_group);
335nomem:
336 if (transport)
337 module_put(transport->owner);
338notransport:
339 mutex_unlock(&sessions_mutex);
340 return NULL;
341}
342
d83004aa
JD		 343void metadata_cache_destroy(struct kref *kref)
344{
345 struct lttng_metadata_cache *cache =
346 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 347 vfree(cache->data);
d83004aa 348 kfree(cache);
4e3c1b9b
MD		 349}
350
8cdc1a81 351void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 352{
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 }
8cdc1a81 365 list_for_each_entry(event_recorder_priv, &session->priv->events, 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);
8cdc1a81 377 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node)
0648898e 378 _lttng_event_destroy(&event_recorder_priv->pub->parent);
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
MD		 415 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
416 &event_notifier_group->event_notifiers_head, 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
MD		 433 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
434 &event_notifier_group->event_notifiers_head, 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
8cdc1a81 570 list_for_each_entry(event_recorder_priv, &session->priv->events, 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 */
1ae083ba 875struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 876 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 877{
def1e304 878 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
5b9817ae 879 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
def1e304 880 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
f7d06400 881 struct lttng_kernel_session *session = chan->parent.session;
a67ba386
MD		 882 struct lttng_kernel_event_recorder *event_recorder;
883 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 884 const char *event_name;
885 struct hlist_head *head;
3d084699 886 int ret;
4e3c1b9b 887
f7d06400 888 if (chan->priv->free_event_id == -1U) {
4cf0bf51 889 ret = -EMFILE;
e5382b6d 890 goto full;
abc0446a 891 }
3c997079
MD		 892
893 switch (itype) {
606828e4 894 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 895 event_name = event_desc->event_name;
3c997079 896 break;
b4a75708 897
c190d76e
MJ		 898 case LTTNG_KERNEL_ABI_KPROBE:
899 lttng_fallthrough;
900 case LTTNG_KERNEL_ABI_UPROBE:
901 lttng_fallthrough;
902 case LTTNG_KERNEL_ABI_KRETPROBE:
903 lttng_fallthrough;
606828e4 904 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 905 event_name = event_param->name;
906 break;
b4a75708 907
c190d76e
MJ		 908 case LTTNG_KERNEL_ABI_FUNCTION:
909 lttng_fallthrough;
910 case LTTNG_KERNEL_ABI_NOOP:
911 lttng_fallthrough;
3c997079
MD		 912 default:
913 WARN_ON_ONCE(1);
914 ret = -EINVAL;
915 goto type_error;
916 }
4a11ef1c 917
8cdc1a81 918 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
4a11ef1c 919 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 920 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
921 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
922 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 923 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 924 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 925 ret = -EEXIST;
926 goto exist;
abc0446a
MD		 927 }
928 }
3c997079 929
a67ba386
MD		 930 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
931 if (!event_recorder) {
4cf0bf51 932 ret = -ENOMEM;
4e3c1b9b 933 goto cache_error;
abc0446a 934 }
a67ba386
MD		 935 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
936 if (!event_recorder_priv) {
937 ret = -ENOMEM;
938 goto cache_private_error;
939 }
940 event_recorder_priv->pub = event_recorder;
941 event_recorder_priv->parent.pub = &event_recorder->parent;
942 event_recorder->priv = event_recorder_priv;
943 event_recorder->parent.priv = &event_recorder_priv->parent;
944 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
945
8a445457 946 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 947 event_recorder->chan = chan;
f7d06400 948 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 949 event_recorder->priv->parent.instrumentation = itype;
950 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
951 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 952
953 switch (itype) {
606828e4 954 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 955 /* Event will be enabled by enabler sync. */
a67ba386
MD		 956 event_recorder->parent.enabled = 0;
957 event_recorder->priv->parent.registered = 0;
958 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
959 if (!event_recorder->priv->parent.desc) {
4cf0bf51 960 ret = -ENOENT;
d3dbe23c 961 goto register_error;
abc0446a 962 }
3c997079
MD		 963 /* Populate lttng_event structure before event registration. */
964 smp_wmb();
baf20995 965 break;
b4a75708 966
606828e4 967 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 968 /*
969 * Needs to be explicitly enabled after creation, since
970 * we may want to apply filters.
971 */
a67ba386
MD		 972 event_recorder->parent.enabled = 0;
973 event_recorder->priv->parent.registered = 1;
3c997079
MD		 974 /*
975 * Populate lttng_event structure before event
976 * registration.
977 */
978 smp_wmb();
8bf17deb 979 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 980 event_param->u.kprobe.symbol_name,
981 event_param->u.kprobe.offset,
982 event_param->u.kprobe.addr,
6a35e5bd 983 &event_recorder->parent);
abc0446a 984 if (ret) {
4cf0bf51 985 ret = -EINVAL;
d6d808f3 986 goto register_error;
abc0446a 987 }
a67ba386 988 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 989 WARN_ON_ONCE(!ret);
d6d808f3 990 break;
b4a75708 991
606828e4 992 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 993 {
a67ba386
MD		 994 struct lttng_kernel_event_recorder *event_recorder_return;
995 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 996
997 /* kretprobe defines 2 events */
a0493bef
MD		 998 /*
999 * Needs to be explicitly enabled after creation, since
1000 * we may want to apply filters.
1001 */
a67ba386
MD		 1002 event_recorder->parent.enabled = 0;
1003 event_recorder->priv->parent.registered = 1;
1004
1005 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
1006 if (!event_recorder_return) {
1007 ret = -ENOMEM;
1008 goto register_error;
1009 }
1010 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1011 if (!event_recorder_return_priv) {
1012 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1013 ret = -ENOMEM;
7371f44c 1014 goto register_error;
abc0446a 1015 }
a67ba386
MD		 1016 event_recorder_return_priv->pub = event_recorder_return;
1017 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1018 event_recorder_return->priv = event_recorder_return_priv;
1019 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1020 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1021
8a445457 1022 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 1023 event_recorder_return->chan = chan;
f7d06400 1024 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 1025 event_recorder_return->priv->parent.instrumentation = itype;
1026 event_recorder_return->parent.enabled = 0;
1027 event_recorder_return->priv->parent.registered = 1;
1028 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1029 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1030 /*
a90917c3 1031 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1032 */
1033 smp_wmb();
3c997079 1034 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1035 event_param->u.kretprobe.symbol_name,
1036 event_param->u.kretprobe.offset,
1037 event_param->u.kretprobe.addr,
eb6b47db 1038 &event_recorder->parent, &event_recorder_return->parent);
7371f44c 1039 if (ret) {
a67ba386
MD		 1040 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1041 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1042 ret = -EINVAL;
7371f44c
MD		 1043 goto register_error;
1044 }
1045 /* Take 2 refs on the module: one per event. */
a67ba386 1046 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1047 WARN_ON_ONCE(!ret);
a67ba386 1048 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1049 WARN_ON_ONCE(!ret);
f7d06400 1050 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1051 event_recorder_return);
abc0446a 1052 WARN_ON_ONCE(ret > 0);
7371f44c 1053 if (ret) {
a67ba386
MD		 1054 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1055 kmem_cache_free(event_recorder_cache, event_recorder_return);
1056 module_put(event_recorder_return->priv->parent.desc->owner);
1057 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1058 goto statedump_error;
1059 }
f7d06400 1060 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
7371f44c
MD		 1061 break;
1062 }
b4a75708 1063
606828e4 1064 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1065 /*
1066 * Needs to be explicitly enabled after creation, since
1067 * we may want to apply filters.
1068 */
a67ba386
MD		 1069 event_recorder->parent.enabled = 0;
1070 event_recorder->priv->parent.registered = 0;
1071 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1072 switch (event_param->u.syscall.entryexit) {
606828e4 1073 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1074 ret = -EINVAL;
1075 goto register_error;
606828e4 1076 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1077 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1078 break;
606828e4 1079 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1080 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1081 break;
1082 }
1083 switch (event_param->u.syscall.abi) {
606828e4 1084 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1085 ret = -EINVAL;
1086 goto register_error;
606828e4 1087 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1088 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1089 break;
606828e4 1090 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1091 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1092 break;
1093 }
a67ba386 1094 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1095 ret = -EINVAL;
259b6cb3 1096 goto register_error;
abc0446a 1097 }
1ec65de1 1098 break;
b4a75708 1099
606828e4 1100 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1101 /*
1102 * Needs to be explicitly enabled after creation, since
1103 * we may want to apply filters.
1104 */
a67ba386
MD		 1105 event_recorder->parent.enabled = 0;
1106 event_recorder->priv->parent.registered = 1;
3aed4dca 1107
a344f64b
FD		 1108 /*
1109 * Populate lttng_event structure before event
1110 * registration.
1111 */
1112 smp_wmb();
149b9a9d 1113
83b802dc 1114 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1115 event_param->u.uprobe.fd,
17806c46 1116 &event_recorder->parent);
149b9a9d
YB		 1117 if (ret)
1118 goto register_error;
a67ba386 1119 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1120 WARN_ON_ONCE(!ret);
1121 break;
b4a75708 1122
c190d76e
MJ		 1123 case LTTNG_KERNEL_ABI_FUNCTION:
1124 lttng_fallthrough;
1125 case LTTNG_KERNEL_ABI_NOOP:
1126 lttng_fallthrough;
baf20995
MD		 1127 default:
1128 WARN_ON_ONCE(1);
4cf0bf51 1129 ret = -EINVAL;
df07930b 1130 goto register_error;
baf20995 1131 }
f7d06400 1132 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1133 WARN_ON_ONCE(ret > 0);
1134 if (ret) {
c099397a 1135 goto statedump_error;
abc0446a 1136 }
a67ba386 1137 hlist_add_head(&event_recorder->priv->hlist, head);
f7d06400 1138 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
a67ba386 1139 return event_recorder;
4e3c1b9b 1140
c099397a 1141statedump_error:
259b6cb3 1142 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1143register_error:
a67ba386
MD		 1144 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1145cache_private_error:
1146 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1147cache_error:
1148exist:
3c997079 1149type_error:
e5382b6d 1150full:
4cf0bf51 1151 return ERR_PTR(ret);
4e3c1b9b
MD		 1152}
1153
a67ba386 1154struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1155 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1156 uint64_t token, uint64_t error_counter_index,
1157 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1158 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1159 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1160{
a67ba386
MD		 1161 struct lttng_kernel_event_notifier *event_notifier;
1162 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1163 struct lttng_counter *error_counter;
dffef45d
FD		 1164 const char *event_name;
1165 struct hlist_head *head;
1166 int ret;
1167
1168 switch (itype) {
606828e4 1169 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1170 event_name = event_desc->event_name;
b01155ba 1171 break;
b4a75708 1172
c190d76e
MJ		 1173 case LTTNG_KERNEL_ABI_KPROBE:
1174 lttng_fallthrough;
1175 case LTTNG_KERNEL_ABI_UPROBE:
1176 lttng_fallthrough;
606828e4 1177 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1178 event_name = event_notifier_param->event.name;
1179 break;
b4a75708 1180
c190d76e
MJ		 1181 case LTTNG_KERNEL_ABI_KRETPROBE:
1182 lttng_fallthrough;
1183 case LTTNG_KERNEL_ABI_FUNCTION:
1184 lttng_fallthrough;
1185 case LTTNG_KERNEL_ABI_NOOP:
1186 lttng_fallthrough;
dffef45d
FD		 1187 default:
1188 WARN_ON_ONCE(1);
1189 ret = -EINVAL;
1190 goto type_error;
1191 }
1192
1193 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1194 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1195 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1196 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1197 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1198 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1199 && event_notifier_group == event_notifier_priv->group
1200 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1201 ret = -EEXIST;
1202 goto exist;
1203 }
1204 }
1205
1206 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1207 if (!event_notifier) {
1208 ret = -ENOMEM;
1209 goto cache_error;
1210 }
a67ba386
MD		 1211 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1212 if (!event_notifier_priv) {
1213 ret = -ENOMEM;
1214 goto cache_private_error;
1215 }
1216 event_notifier_priv->pub = event_notifier;
1217 event_notifier_priv->parent.pub = &event_notifier->parent;
1218 event_notifier->priv = event_notifier_priv;
1219 event_notifier->parent.priv = &event_notifier_priv->parent;
1220 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1221
1222 event_notifier->priv->group = event_notifier_group;
1223 event_notifier->priv->parent.user_token = token;
1224 event_notifier->priv->error_counter_index = error_counter_index;
1225 event_notifier->priv->num_captures = 0;
1226 event_notifier->priv->parent.instrumentation = itype;
1227 event_notifier->notification_send = lttng_event_notifier_notification_send;
1228 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1229 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1230 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1231 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1232
1233 switch (itype) {
606828e4 1234 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1235 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1236 event_notifier->parent.enabled = 0;
1237 event_notifier->priv->parent.registered = 0;
1238 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1239 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1240 ret = -ENOENT;
1241 goto register_error;
1242 }
1243 /* Populate lttng_event_notifier structure before event registration. */
1244 smp_wmb();
1245 break;
b4a75708 1246
606828e4 1247 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1248 /*
1249 * Needs to be explicitly enabled after creation, since
1250 * we may want to apply filters.
1251 */
a67ba386
MD		 1252 event_notifier->parent.enabled = 0;
1253 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1254 /*
1255 * Populate lttng_event_notifier structure before event
1256 * registration.
1257 */
1258 smp_wmb();
6a35e5bd 1259 ret = lttng_kprobes_register_event(event_notifier_param->event.u.kprobe.symbol_name,
2b16f0c9
FD		 1260 event_notifier_param->event.u.kprobe.symbol_name,
1261 event_notifier_param->event.u.kprobe.offset,
1262 event_notifier_param->event.u.kprobe.addr,
6a35e5bd 1263 &event_notifier->parent);
2b16f0c9
FD		 1264 if (ret) {
1265 ret = -EINVAL;
1266 goto register_error;
1267 }
a67ba386 1268 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1269 WARN_ON_ONCE(!ret);
1270 break;
b4a75708 1271
606828e4 1272 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1273 /*
1274 * Needs to be explicitly enabled after creation, since
1275 * we may want to apply filters.
1276 */
a67ba386
MD		 1277 event_notifier->parent.enabled = 0;
1278 event_notifier->priv->parent.registered = 0;
1279 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1280 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1281 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1282 ret = -EINVAL;
1283 goto register_error;
606828e4 1284 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1285 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1286 break;
606828e4 1287 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1288 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1289 break;
1290 }
1291 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1292 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1293 ret = -EINVAL;
1294 goto register_error;
606828e4 1295 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1296 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1297 break;
606828e4 1298 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1299 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1300 break;
1301 }
1302
a67ba386 1303 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1304 ret = -EINVAL;
1305 goto register_error;
1306 }
1307 break;
b4a75708 1308
606828e4 1309 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1310 /*
1311 * Needs to be explicitly enabled after creation, since
1312 * we may want to apply filters.
1313 */
a67ba386
MD		 1314 event_notifier->parent.enabled = 0;
1315 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1316
1317 /*
1318 * Populate lttng_event_notifier structure before
1319 * event_notifier registration.
1320 */
1321 smp_wmb();
1322
17806c46 1323 ret = lttng_uprobes_register_event(event_notifier_param->event.name,
9de67196 1324 event_notifier_param->event.u.uprobe.fd,
17806c46 1325 &event_notifier->parent);
9de67196
FD		 1326 if (ret)
1327 goto register_error;
a67ba386 1328 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1329 WARN_ON_ONCE(!ret);
1330 break;
b4a75708 1331
c190d76e
MJ		 1332 case LTTNG_KERNEL_ABI_KRETPROBE:
1333 lttng_fallthrough;
1334 case LTTNG_KERNEL_ABI_FUNCTION:
1335 lttng_fallthrough;
1336 case LTTNG_KERNEL_ABI_NOOP:
1337 lttng_fallthrough;
dffef45d
FD		 1338 default:
1339 WARN_ON_ONCE(1);
1340 ret = -EINVAL;
1341 goto register_error;
1342 }
1343
a67ba386
MD		 1344 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1345 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1346
1347 /*
1348 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1349 * bucket is currently in use. We trust it. The session lock
1350 * synchronizes against concurrent creation of the error
1351 * counter.
99f52fcc 1352 */
ab04d7b1
MD		 1353 error_counter = event_notifier_group->error_counter;
1354 if (error_counter) {
99f52fcc
FD		 1355 size_t dimension_index[1];
1356
1357 /*
1358 * Check that the index is within the boundary of the counter.
1359 */
a67ba386 1360 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1361 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1362 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1363 ret = -EINVAL;
1364 goto register_error;
1365 }
1366
a67ba386 1367 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1368 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1369 if (ret) {
1370 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1371 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1372 goto register_error;
1373 }
1374 }
1375
dffef45d
FD		 1376 return event_notifier;
1377
1378register_error:
a67ba386
MD		 1379 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1380cache_private_error:
dffef45d
FD		 1381 kmem_cache_free(event_notifier_cache, event_notifier);
1382cache_error:
1383exist:
1384type_error:
1385 return ERR_PTR(ret);
1386}
1387
99f52fcc
FD		 1388int lttng_kernel_counter_read(struct lttng_counter *counter,
1389 const size_t *dim_indexes, int32_t cpu,
1390 int64_t *val, bool *overflow, bool *underflow)
1391{
1392 return counter->ops->counter_read(counter->counter, dim_indexes,
1393 cpu, val, overflow, underflow);
1394}
1395
1396int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1397 const size_t *dim_indexes, int64_t *val,
1398 bool *overflow, bool *underflow)
1399{
1400 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1401 val, overflow, underflow);
1402}
1403
1404int lttng_kernel_counter_clear(struct lttng_counter *counter,
1405 const size_t *dim_indexes)
1406{
1407 return counter->ops->counter_clear(counter->counter, dim_indexes);
1408}
1409
1ae083ba 1410struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 1411 const struct lttng_kernel_event_desc *event_desc)
3c997079 1412{
a67ba386 1413 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1414
1415 mutex_lock(&sessions_mutex);
def1e304 1416 event = _lttng_kernel_event_recorder_create(event_enabler, event_desc);
3c997079
MD		 1417 mutex_unlock(&sessions_mutex);
1418 return event;
1419}
1420
a67ba386 1421struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1422 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1423 uint64_t id, uint64_t error_counter_index,
1424 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1425 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1426 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1427{
a67ba386 1428 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1429
1430 mutex_lock(&sessions_mutex);
1431 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1432 error_counter_index, event_notifier_group,
a67ba386 1433 event_notifier_param, itype);
dffef45d
FD		 1434 mutex_unlock(&sessions_mutex);
1435 return event_notifier;
1436}
1437
3c997079
MD		 1438/* Only used for tracepoints for now. */
1439static
0c851fa0 1440void register_event(struct lttng_kernel_event_common *event)
3c997079 1441{
437d5aa5 1442 const struct lttng_kernel_event_desc *desc;
f127e61e 1443 int ret = -EINVAL;
3c997079 1444
0c851fa0 1445 if (event->priv->registered)
3c997079 1446 return;
4ecb5ad5 1447
0c851fa0
MD		 1448 desc = event->priv->desc;
1449 switch (event->priv->instrumentation) {
606828e4 1450 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1451 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1452 desc->tp_class->probe_callback,
0c851fa0 1453 event);
4ecb5ad5 1454 break;
b4a75708 1455
606828e4 1456 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1457 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1458 break;
b4a75708 1459
c190d76e
MJ		 1460 case LTTNG_KERNEL_ABI_KPROBE:
1461 lttng_fallthrough;
1462 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1463 ret = 0;
f0bcc14c 1464 break;
0c851fa0
MD		 1465
1466 case LTTNG_KERNEL_ABI_KRETPROBE:
1467 switch (event->type) {
1468 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1469 ret = 0;
1470 break;
1471 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1472 WARN_ON_ONCE(1);
1473 break;
1474 }
4ecb5ad5 1475 break;
b4a75708 1476
c190d76e
MJ		 1477 case LTTNG_KERNEL_ABI_FUNCTION:
1478 lttng_fallthrough;
1479 case LTTNG_KERNEL_ABI_NOOP:
1480 lttng_fallthrough;
4ecb5ad5
MD		 1481 default:
1482 WARN_ON_ONCE(1);
1483 }
3c997079 1484 if (!ret)
0c851fa0 1485 event->priv->registered = 1;
3c997079
MD		 1486}
1487
f0bcc14c 1488int _lttng_event_unregister(struct lttng_kernel_event_common *event)
4e3c1b9b 1489{
f0bcc14c 1490 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1491 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1492 int ret = -EINVAL;
1493
a67ba386 1494 if (!event_priv->registered)
3c997079
MD		 1495 return 0;
1496
a67ba386
MD		 1497 desc = event_priv->desc;
1498 switch (event_priv->instrumentation) {
606828e4 1499 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1500 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1501 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1502 event);
baf20995 1503 break;
b4a75708 1504
606828e4 1505 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1506 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1507 ret = 0;
1508 break;
b4a75708 1509
606828e4 1510 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1511 switch (event->type) {
1512 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1513 lttng_kretprobes_unregister(event);
1514 ret = 0;
1515 break;
1516 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1517 WARN_ON_ONCE(1);
1518 break;
1519 }
7371f44c 1520 break;
b4a75708 1521
606828e4 1522 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1523 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1524 break;
b4a75708 1525
606828e4 1526 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1527 switch (event->type) {
1528 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1529 ret = 0;
1530 break;
1531 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1532 WARN_ON_ONCE(1);
1533 break;
1534 }
259b6cb3 1535 break;
b4a75708 1536
606828e4 1537 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1538 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1539 ret = 0;
1540 break;
b4a75708 1541
c190d76e
MJ		 1542 case LTTNG_KERNEL_ABI_FUNCTION:
1543 lttng_fallthrough;
baf20995
MD		 1544 default:
1545 WARN_ON_ONCE(1);
1546 }
3c997079 1547 if (!ret)
a67ba386 1548 event_priv->registered = 0;
dda6a249
MD		 1549 return ret;
1550}
1551
1552/*
1553 * Only used internally at session destruction.
1554 */
be066e6c 1555static
0648898e 1556void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1557{
0648898e 1558 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1559 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1560
0648898e
MD		 1561 lttng_free_event_filter_runtime(event);
1562 /* Free event enabler refs */
1563 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1564 &event_priv->enablers_ref_head, node)
1565 kfree(enabler_ref);
b4a75708 1566
0648898e
MD		 1567 switch (event->type) {
1568 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1569 {
1570 struct lttng_kernel_event_recorder *event_recorder =
1571 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1572
0648898e
MD		 1573 switch (event_priv->instrumentation) {
1574 case LTTNG_KERNEL_ABI_TRACEPOINT:
1575 lttng_event_desc_put(event_priv->desc);
1576 break;
b4a75708 1577
0648898e
MD		 1578 case LTTNG_KERNEL_ABI_KPROBE:
1579 module_put(event_priv->desc->owner);
6a35e5bd 1580 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1581 break;
b4a75708 1582
0648898e
MD		 1583 case LTTNG_KERNEL_ABI_KRETPROBE:
1584 module_put(event_priv->desc->owner);
eb6b47db 1585 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1586 break;
b4a75708 1587
0648898e
MD		 1588 case LTTNG_KERNEL_ABI_SYSCALL:
1589 break;
4e3c1b9b 1590
0648898e
MD		 1591 case LTTNG_KERNEL_ABI_UPROBE:
1592 module_put(event_priv->desc->owner);
17806c46 1593 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1594 break;
3ef5cc03 1595
c190d76e
MJ		 1596 case LTTNG_KERNEL_ABI_FUNCTION:
1597 lttng_fallthrough;
1598 case LTTNG_KERNEL_ABI_NOOP:
1599 lttng_fallthrough;
0648898e
MD		 1600 default:
1601 WARN_ON_ONCE(1);
1602 }
1603 list_del(&event_recorder->priv->node);
1604 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1605 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1606 break;
0648898e
MD		 1607 }
1608 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1609 {
1610 struct lttng_kernel_event_notifier *event_notifier =
1611 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1612
0648898e
MD		 1613 switch (event_notifier->priv->parent.instrumentation) {
1614 case LTTNG_KERNEL_ABI_TRACEPOINT:
1615 lttng_event_desc_put(event_notifier->priv->parent.desc);
1616 break;
b4a75708 1617
0648898e
MD		 1618 case LTTNG_KERNEL_ABI_KPROBE:
1619 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1620 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1621 break;
b4a75708 1622
0648898e
MD		 1623 case LTTNG_KERNEL_ABI_SYSCALL:
1624 break;
b4a75708 1625
0648898e
MD		 1626 case LTTNG_KERNEL_ABI_UPROBE:
1627 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1628 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1629 break;
1630
c190d76e
MJ		 1631 case LTTNG_KERNEL_ABI_KRETPROBE:
1632 lttng_fallthrough;
1633 case LTTNG_KERNEL_ABI_FUNCTION:
1634 lttng_fallthrough;
1635 case LTTNG_KERNEL_ABI_NOOP:
1636 lttng_fallthrough;
0648898e
MD		 1637 default:
1638 WARN_ON_ONCE(1);
1639 }
1640 list_del(&event_notifier->priv->node);
1641 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1642 kmem_cache_free(event_notifier_cache, event_notifier);
1643 break;
1644 }
dffef45d
FD		 1645 default:
1646 WARN_ON_ONCE(1);
1647 }
dffef45d
FD		 1648}
1649
8c0393c3 1650struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1651 enum tracker_type tracker_type)
e0130fab 1652{
d1f652f8
MD		 1653 switch (tracker_type) {
1654 case TRACKER_PID:
1655 return &session->pid_tracker;
1656 case TRACKER_VPID:
1657 return &session->vpid_tracker;
1658 case TRACKER_UID:
1659 return &session->uid_tracker;
1660 case TRACKER_VUID:
1661 return &session->vuid_tracker;
1662 case TRACKER_GID:
1663 return &session->gid_tracker;
1664 case TRACKER_VGID:
1665 return &session->vgid_tracker;
1666 default:
1667 WARN_ON_ONCE(1);
1668 return NULL;
1669 }
1670}
1671
8cdc1a81 1672int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1673 enum tracker_type tracker_type, int id)
1674{
8c0393c3 1675 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1676 int ret;
1677
d1f652f8
MD		 1678 tracker = get_tracker(session, tracker_type);
1679 if (!tracker)
1680 return -EINVAL;
1681 if (id < -1)
e0130fab
MD		 1682 return -EINVAL;
1683 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1684 if (id == -1) {
1685 /* track all ids: destroy tracker. */
1686 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1687 ret = 0;
1688 } else {
d1f652f8 1689 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1690 }
e0130fab
MD		 1691 mutex_unlock(&sessions_mutex);
1692 return ret;
1693}
1694
8cdc1a81 1695int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1696 enum tracker_type tracker_type, int id)
e0130fab 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 /* untrack all ids: replace by empty tracker. */
1709 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1710 } else {
d1f652f8 1711 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1712 }
e0130fab
MD		 1713 mutex_unlock(&sessions_mutex);
1714 return ret;
1715}
1716
7e6f9ef6 1717static
d1f652f8 1718void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1719{
8c0393c3
MD		 1720 struct lttng_kernel_id_tracker *id_tracker = m->private;
1721 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1722 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1723 int iter = 0, i;
1724
1725 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1726 if (id_tracker_p) {
1727 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1728 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1729
f934e302 1730 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1731 if (iter++ >= *pos)
1732 return e;
1733 }
1734 }
1735 } else {
d1f652f8 1736 /* ID tracker disabled. */
7e6f9ef6 1737 if (iter >= *pos && iter == 0) {
d1f652f8 1738 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1739 }
1740 iter++;
1741 }
1742 /* End of list */
1743 return NULL;
1744}
1745
1746/* Called with sessions_mutex held. */
1747static
d1f652f8 1748void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1749{
8c0393c3
MD		 1750 struct lttng_kernel_id_tracker *id_tracker = m->private;
1751 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1752 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1753 int iter = 0, i;
1754
1755 (*ppos)++;
d1f652f8
MD		 1756 if (id_tracker_p) {
1757 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1758 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1759
f934e302 1760 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1761 if (iter++ >= *ppos)
1762 return e;
1763 }
1764 }
1765 } else {
d1f652f8 1766 /* ID tracker disabled. */
7e6f9ef6 1767 if (iter >= *ppos && iter == 0)
d1f652f8 1768 return p; /* empty tracker */
7e6f9ef6
MD		 1769 iter++;
1770 }
1771
1772 /* End of list */
1773 return NULL;
1774}
1775
1776static
d1f652f8 1777void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1778{
1779 mutex_unlock(&sessions_mutex);
1780}
1781
1782static
d1f652f8 1783int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1784{
8c0393c3
MD		 1785 struct lttng_kernel_id_tracker *id_tracker = m->private;
1786 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1787 int id;
7e6f9ef6 1788
d1f652f8 1789 if (p == id_tracker_p) {
7e6f9ef6 1790 /* Tracker disabled. */
d1f652f8 1791 id = -1;
7e6f9ef6 1792 } else {
d1f652f8 1793 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1794
d1f652f8
MD		 1795 id = lttng_id_tracker_get_node_id(e);
1796 }
8c0393c3 1797 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1798 case TRACKER_PID:
1799 seq_printf(m, "process { pid = %d; };\n", id);
1800 break;
1801 case TRACKER_VPID:
1802 seq_printf(m, "process { vpid = %d; };\n", id);
1803 break;
1804 case TRACKER_UID:
1805 seq_printf(m, "user { uid = %d; };\n", id);
1806 break;
1807 case TRACKER_VUID:
1808 seq_printf(m, "user { vuid = %d; };\n", id);
1809 break;
1810 case TRACKER_GID:
1811 seq_printf(m, "group { gid = %d; };\n", id);
1812 break;
1813 case TRACKER_VGID:
1814 seq_printf(m, "group { vgid = %d; };\n", id);
1815 break;
1816 default:
1817 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1818 }
7e6f9ef6
MD		 1819 return 0;
1820}
1821
1822static
d1f652f8
MD		 1823const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1824 .start = id_list_start,
1825 .next = id_list_next,
1826 .stop = id_list_stop,
1827 .show = id_list_show,
7e6f9ef6
MD		 1828};
1829
1830static
d1f652f8 1831int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1832{
d1f652f8 1833 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1834}
1835
1836static
d1f652f8 1837int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1838{
1839 struct seq_file *m = file->private_data;
8c0393c3 1840 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1841 int ret;
1842
d1f652f8 1843 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1844 ret = seq_release(inode, file);
d1f652f8 1845 if (!ret)
8c0393c3 1846 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1847 return ret;
1848}
1849
d1f652f8 1850const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1851 .owner = THIS_MODULE,
d1f652f8 1852 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1853 .read = seq_read,
1854 .llseek = seq_lseek,
d1f652f8 1855 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1856};
1857
8cdc1a81 1858int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1859 enum tracker_type tracker_type)
7e6f9ef6 1860{
d1f652f8 1861 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1862 struct seq_file *m;
1863 int file_fd, ret;
1864
1865 file_fd = lttng_get_unused_fd();
1866 if (file_fd < 0) {
1867 ret = file_fd;
1868 goto fd_error;
1869 }
1870
d1f652f8
MD		 1871 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1872 &lttng_tracker_ids_list_fops,
7e6f9ef6 1873 NULL, O_RDWR);
d1f652f8
MD		 1874 if (IS_ERR(tracker_ids_list_file)) {
1875 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1876 goto file_error;
1877 }
8cdc1a81 1878 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1879 ret = -EOVERFLOW;
9c1f4643
MD		 1880 goto refcount_error;
1881 }
d1f652f8 1882 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1883 if (ret < 0)
1884 goto open_error;
d1f652f8
MD		 1885 m = tracker_ids_list_file->private_data;
1886
1887 m->private = get_tracker(session, tracker_type);
1888 BUG_ON(!m->private);
1889 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1890
1891 return file_fd;
1892
1893open_error:
8cdc1a81 1894 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1895refcount_error:
d1f652f8 1896 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1897file_error:
1898 put_unused_fd(file_fd);
1899fd_error:
1900 return ret;
1901}
1902
3c997079
MD		 1903/*
1904 * Enabler management.
1905 */
1906static
4993071a
PP		 1907int lttng_match_enabler_star_glob(const char *desc_name,
1908 const char *pattern)
3c997079 1909{
cbc19040
MD		 1910 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1911 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1912 return 0;
1913 return 1;
1914}
1915
1916static
4ecb5ad5
MD		 1917int lttng_match_enabler_name(const char *desc_name,
1918 const char *name)
3c997079 1919{
4ecb5ad5 1920 if (strcmp(desc_name, name))
3c997079
MD		 1921 return 0;
1922 return 1;
1923}
1924
437d5aa5 1925int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
8d554755 1926 struct lttng_event_enabler_common *enabler)
3c997079 1927{
4ecb5ad5 1928 const char *desc_name, *enabler_name;
badfe9f5 1929 bool compat = false, entry = false;
4ecb5ad5
MD		 1930
1931 enabler_name = enabler->event_param.name;
1932 switch (enabler->event_param.instrumentation) {
606828e4 1933 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1934 desc_name = desc->event_name;
3b861b22
FD		 1935 switch (enabler->format_type) {
1936 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1937 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1938 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1939 return lttng_match_enabler_name(desc_name, enabler_name);
1940 default:
1941 return -EINVAL;
1942 }
4ecb5ad5 1943 break;
b4a75708 1944
606828e4 1945 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1946 desc_name = desc->event_name;
badfe9f5 1947 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1948 desc_name += strlen("compat_");
badfe9f5
MD		 1949 compat = true;
1950 }
4ecb5ad5
MD		 1951 if (!strncmp(desc_name, "syscall_exit_",
1952 strlen("syscall_exit_"))) {
1953 desc_name += strlen("syscall_exit_");
1954 } else if (!strncmp(desc_name, "syscall_entry_",
1955 strlen("syscall_entry_"))) {
1956 desc_name += strlen("syscall_entry_");
badfe9f5 1957 entry = true;
4ecb5ad5
MD		 1958 } else {
1959 WARN_ON_ONCE(1);
1960 return -EINVAL;
1961 }
badfe9f5 1962 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1963 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1964 break;
606828e4 1965 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1966 if (!entry)
1967 return 0;
1968 break;
606828e4 1969 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1970 if (entry)
1971 return 0;
1972 break;
1973 default:
1974 return -EINVAL;
1975 }
1976 switch (enabler->event_param.u.syscall.abi) {
606828e4 1977 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1978 break;
606828e4 1979 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1980 if (compat)
1981 return 0;
1982 break;
606828e4 1983 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1984 if (!compat)
1985 return 0;
1986 break;
1987 default:
1988 return -EINVAL;
1989 }
1990 switch (enabler->event_param.u.syscall.match) {
606828e4 1991 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1992 switch (enabler->format_type) {
1993 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1994 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1995 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1996 return lttng_match_enabler_name(desc_name, enabler_name);
1997 default:
1998 return -EINVAL;
1999 }
2000 break;
606828e4 2001 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2002 return -EINVAL; /* Not implemented. */
2003 default:
2004 return -EINVAL;
2005 }
4ecb5ad5 2006 break;
b4a75708 2007
4ecb5ad5
MD		 2008 default:
2009 WARN_ON_ONCE(1);
2010 return -EINVAL;
2011 }
3c997079
MD		 2012}
2013
2014static
1ae083ba 2015int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler *event_enabler,
a67ba386 2016 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2017{
1ae083ba 2018 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(
b2bc0bc8
FD		 2019 event_enabler);
2020
a67ba386 2021 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2022 return 0;
a67ba386
MD		 2023 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2024 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2025 return 1;
2026 else
2027 return 0;
2028}
2029
b01155ba
FD		 2030static
2031int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2032 struct lttng_kernel_event_notifier *event_notifier)
b01155ba 2033{
8d554755 2034 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(
b01155ba
FD		 2035 event_notifier_enabler);
2036
a67ba386 2037 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2038 return 0;
a67ba386
MD		 2039 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2040 && event_notifier->priv->group == event_notifier_enabler->group
5b9817ae 2041 && event_notifier->priv->parent.user_token == event_notifier_enabler->parent.user_token)
b01155ba
FD		 2042 return 1;
2043 else
2044 return 0;
2045}
2046
3c997079 2047static
b2bc0bc8
FD		 2048struct lttng_enabler_ref *lttng_enabler_ref(
2049 struct list_head *enablers_ref_list,
8d554755 2050 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2051{
2052 struct lttng_enabler_ref *enabler_ref;
2053
b2bc0bc8 2054 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2055 if (enabler_ref->ref == enabler)
2056 return enabler_ref;
2057 }
2058 return NULL;
2059}
2060
3c997079 2061static
1ae083ba 2062void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2063{
f7d06400 2064 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
437d5aa5
MD		 2065 struct lttng_kernel_probe_desc *probe_desc;
2066 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2067 int i;
2068 struct list_head *probe_list;
2069
2070 probe_list = lttng_get_probe_list_head();
2071 /*
2072 * For each probe event, if we find that a probe event matches
2073 * our enabler, create an associated lttng_event if not
2074 * already present.
2075 */
2076 list_for_each_entry(probe_desc, probe_list, head) {
2077 for (i = 0; i < probe_desc->nr_events; i++) {
2078 int found = 0;
2079 struct hlist_head *head;
a67ba386
MD		 2080 struct lttng_kernel_event_recorder_private *event_recorder_private;
2081 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2082
2083 desc = probe_desc->event_desc[i];
b2bc0bc8 2084 if (!lttng_desc_match_enabler(desc,
1ae083ba 2085 lttng_event_recorder_enabler_as_enabler(event_enabler)))
3c997079 2086 continue;
3c997079
MD		 2087
2088 /*
2089 * Check if already created.
2090 */
4a11ef1c 2091 head = utils_borrow_hash_table_bucket(
8cdc1a81 2092 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2093 desc->event_name);
a67ba386
MD		 2094 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2095 if (event_recorder_private->parent.desc == desc
2096 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2097 found = 1;
2098 }
2099 if (found)
2100 continue;
2101
2102 /*
2103 * We need to create an event for this
2104 * event probe.
2105 */
def1e304 2106 event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
a67ba386 2107 if (!event_recorder) {
5a15f70c 2108 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2109 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2110 }
2111 }
2112 }
2113}
2114
b01155ba
FD		 2115static
2116void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2117{
2118 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2119 struct lttng_kernel_probe_desc *probe_desc;
2120 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2121 int i;
2122 struct list_head *probe_list;
2123
2124 probe_list = lttng_get_probe_list_head();
2125 /*
2126 * For each probe event, if we find that a probe event matches
2127 * our enabler, create an associated lttng_event_notifier if not
2128 * already present.
2129 */
2130 list_for_each_entry(probe_desc, probe_list, head) {
2131 for (i = 0; i < probe_desc->nr_events; i++) {
2132 int found = 0;
2133 struct hlist_head *head;
a67ba386
MD		 2134 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2135 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2136
2137 desc = probe_desc->event_desc[i];
2138 if (!lttng_desc_match_enabler(desc,
2139 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2140 continue;
2141
2142 /*
2143 * Check if already created.
2144 */
2145 head = utils_borrow_hash_table_bucket(
2146 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2147 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2148 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2149 if (event_notifier_priv->parent.desc == desc
5b9817ae 2150 && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token)
b01155ba
FD		 2151 found = 1;
2152 }
2153 if (found)
2154 continue;
2155
2156 /*
2157 * We need to create a event_notifier for this event probe.
2158 */
2159 event_notifier = _lttng_event_notifier_create(desc,
5b9817ae 2160 event_notifier_enabler->parent.user_token,
99f52fcc 2161 event_notifier_enabler->error_counter_index,
a67ba386 2162 event_notifier_group, NULL,
606828e4 2163 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2164 if (IS_ERR(event_notifier)) {
2165 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2166 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2167 }
2168 }
2169 }
2170}
2171
33a39a3c 2172static
053554ae 2173void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c
MD		 2174{
2175 int ret;
2176
053554ae 2177 ret = lttng_syscalls_register_event(event_enabler);
8a8ac9a8 2178 WARN_ON_ONCE(ret);
8a8ac9a8
FD		 2179}
2180
33a39a3c 2181/*
a67ba386 2182 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2183 * tracepoint probes.
2184 * Should be called with sessions mutex held.
2185 */
2186static
1ae083ba 2187void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
33a39a3c 2188{
5b9817ae 2189 switch (event_enabler->parent.event_param.instrumentation) {
606828e4 2190 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2191 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2192 break;
b4a75708 2193
606828e4 2194 case LTTNG_KERNEL_ABI_SYSCALL:
053554ae 2195 lttng_create_syscall_event_if_missing(&event_enabler->parent);
33a39a3c 2196 break;
b4a75708 2197
33a39a3c
MD		 2198 default:
2199 WARN_ON_ONCE(1);
2200 break;
2201 }
2202}
2203
3c997079 2204/*
b2bc0bc8 2205 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2206 * and add backward reference from the event to the enabler.
2207 * Should be called with sessions mutex held.
2208 */
2209static
1ae083ba 2210int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2211{
f7d06400
MD		 2212 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2213 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
1ae083ba 2214 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
a67ba386 2215 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2216
606828e4
MD		 2217 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2218 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2219 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2220 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2221 int enabled = base_enabler->enabled;
606828e4 2222 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2223
606828e4 2224 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2225 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
3b82c4e1 2226
606828e4 2227 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2228 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
badfe9f5
MD		 2229 }
2230
3c997079 2231 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2232 lttng_create_event_if_missing(event_enabler);
3c997079 2233
b2bc0bc8 2234 /* For each event matching event_enabler in session event list. */
8cdc1a81 2235 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2236 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2237 struct lttng_enabler_ref *enabler_ref;
2238
a67ba386 2239 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2240 continue;
a67ba386 2241 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
1ae083ba 2242 lttng_event_recorder_enabler_as_enabler(event_enabler));
3c997079
MD		 2243 if (!enabler_ref) {
2244 /*
2245 * If no backward ref, create it.
b2bc0bc8 2246 * Add backward ref from event to event_enabler.
3c997079
MD		 2247 */
2248 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2249 if (!enabler_ref)
2250 return -ENOMEM;
1ae083ba 2251 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
3c997079 2252 list_add(&enabler_ref->node,
a67ba386 2253 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2254 }
2255
f127e61e
MD		 2256 /*
2257 * Link filter bytecodes if not linked yet.
2258 */
a67ba386 2259 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2260 lttng_static_ctx,
a67ba386 2261 &event_recorder_priv->parent.filter_bytecode_runtime_head,
1ae083ba 2262 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2263 }
2264 return 0;
2265}
2266
b01155ba 2267/*
a67ba386 2268 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2269 * tracepoint probes.
2270 * Should be called with sessions mutex held.
2271 */
2272static
2273void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2274{
5b9817ae 2275 switch (event_notifier_enabler->parent.event_param.instrumentation) {
606828e4 2276 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2277 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2278 break;
b4a75708 2279
606828e4 2280 case LTTNG_KERNEL_ABI_SYSCALL:
053554ae 2281 lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent);
8a8ac9a8 2282 break;
b4a75708 2283
b01155ba
FD		 2284 default:
2285 WARN_ON_ONCE(1);
2286 break;
2287 }
2288}
2289
2290/*
2291 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2292 */
2293static
8a8ac9a8
FD		 2294int lttng_event_notifier_enabler_ref_event_notifiers(
2295 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2296{
2297 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8d554755 2298 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2299 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2300
606828e4
MD		 2301 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2302 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2303 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2304 !strcmp(base_enabler->event_param.name, "*")) {
2305
2306 int enabled = base_enabler->enabled;
606828e4 2307 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2308
606828e4 2309 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2310 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
8a8ac9a8 2311
606828e4 2312 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2313 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
8a8ac9a8
FD		 2314
2315 }
2316
b01155ba
FD		 2317 /* First ensure that probe event_notifiers are created for this enabler. */
2318 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2319
2320 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2321 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2322 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2323 struct lttng_enabler_ref *enabler_ref;
2324
2325 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2326 continue;
2327
a67ba386 2328 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2329 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2330 if (!enabler_ref) {
2331 /*
2332 * If no backward ref, create it.
2333 * Add backward ref from event_notifier to enabler.
2334 */
2335 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2336 if (!enabler_ref)
2337 return -ENOMEM;
2338
2339 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2340 event_notifier_enabler);
2341 list_add(&enabler_ref->node,
a67ba386 2342 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2343 }
2344
2345 /*
2346 * Link filter bytecodes if not linked yet.
2347 */
a67ba386
MD		 2348 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2349 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2350 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2351
2352 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2353 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2354 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2355 &event_notifier_enabler->capture_bytecode_head);
2356
a67ba386 2357 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2358 }
2359 return 0;
2360}
2361
3c997079
MD		 2362/*
2363 * Called at module load: connect the probe on all enablers matching
2364 * this event.
2365 * Called with sessions lock held.
2366 */
2367int lttng_fix_pending_events(void)
2368{
8cdc1a81 2369 struct lttng_kernel_session_private *session_priv;
3c997079 2370
8cdc1a81
MD		 2371 list_for_each_entry(session_priv, &sessions, list)
2372 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2373 return 0;
2374}
2375
b01155ba
FD		 2376static bool lttng_event_notifier_group_has_active_event_notifiers(
2377 struct lttng_event_notifier_group *event_notifier_group)
2378{
2379 struct lttng_event_notifier_enabler *event_notifier_enabler;
2380
2381 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2382 node) {
5b9817ae 2383 if (event_notifier_enabler->parent.enabled)
b01155ba
FD		 2384 return true;
2385 }
2386 return false;
2387}
2388
2389bool lttng_event_notifier_active(void)
2390{
2391 struct lttng_event_notifier_group *event_notifier_group;
2392
2393 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2394 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2395 return true;
2396 }
2397 return false;
2398}
2399
2400int lttng_fix_pending_event_notifiers(void)
2401{
2402 struct lttng_event_notifier_group *event_notifier_group;
2403
2404 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2405 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2406 return 0;
2407}
2408
1ae083ba 2409struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2410 enum lttng_enabler_format_type format_type,
606828e4 2411 struct lttng_kernel_abi_event *event_param,
f7d06400 2412 struct lttng_kernel_channel_buffer *chan)
3c997079 2413{
1ae083ba 2414 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2415
b2bc0bc8
FD		 2416 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2417 if (!event_enabler)
3c997079 2418 return NULL;
0bb716a8 2419 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2420 event_enabler->parent.format_type = format_type;
2421 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2422 memcpy(&event_enabler->parent.event_param, event_param,
2423 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2424 event_enabler->chan = chan;
3c997079 2425 /* ctx left NULL */
5b9817ae 2426 event_enabler->parent.enabled = 0;
def1e304
MD		 2427 return event_enabler;
2428}
2429
2430void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2431 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2432{
3c997079 2433 mutex_lock(&sessions_mutex);
def1e304
MD		 2434 list_add(&event_enabler->node, &session->priv->enablers_head);
2435 event_enabler->published = true;
2436 lttng_session_lazy_sync_event_enablers(session);
3c997079 2437 mutex_unlock(&sessions_mutex);
3c997079
MD		 2438}
2439
7b25ab0e 2440int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2441{
2442 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2443 event_enabler->enabled = 1;
2444 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2445 mutex_unlock(&sessions_mutex);
2446 return 0;
2447}
2448
7b25ab0e 2449int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2450{
2451 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2452 event_enabler->enabled = 0;
2453 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2454 mutex_unlock(&sessions_mutex);
2455 return 0;
2456}
2457
b2bc0bc8 2458static
8d554755 2459int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2460 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2461{
d64ca521 2462 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2463 uint32_t bytecode_len;
2464 int ret;
2465
2466 ret = get_user(bytecode_len, &bytecode->len);
2467 if (ret)
2468 return ret;
52cfcdf3 2469 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2470 GFP_KERNEL);
2471 if (!bytecode_node)
2472 return -ENOMEM;
2473 ret = copy_from_user(&bytecode_node->bc, bytecode,
2474 sizeof(*bytecode) + bytecode_len);
2475 if (ret)
2476 goto error_free;
b2bc0bc8 2477
8a445457 2478 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2479 bytecode_node->enabler = enabler;
2480 /* Enforce length based on allocated size */
2481 bytecode_node->bc.len = bytecode_len;
2482 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2483
07dfc1d0
MD		 2484 return 0;
2485
2486error_free:
52cfcdf3 2487 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2488 return ret;
2489}
2490
6048044f 2491int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2492 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2493{
2494 int ret;
6048044f 2495 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2496 if (ret)
2497 goto error;
7b25ab0e 2498 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2499 return 0;
2500
2501error:
2502 return ret;
2503}
2504
e2d5dbc7 2505int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2506 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2507{
2508
e2d5dbc7 2509 switch (event->priv->instrumentation) {
606828e4 2510 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2511 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2512 default:
2513 return -EINVAL;
2514 }
2515}
2516
3c997079 2517static
8d554755 2518void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2519{
d64ca521 2520 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2521
2522 /* Destroy filter bytecode */
2523 list_for_each_entry_safe(filter_node, tmp_filter_node,
2524 &enabler->filter_bytecode_head, node) {
52cfcdf3 2525 lttng_kvfree(filter_node);
07dfc1d0 2526 }
b2bc0bc8
FD		 2527}
2528
44b1abdc 2529void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2530{
44b1abdc
MD		 2531 switch (event_enabler->enabler_type) {
2532 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2533 {
2534 struct lttng_event_recorder_enabler *event_recorder_enabler =
2535 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2536
2537 lttng_enabler_destroy(event_enabler);
2538 if (event_recorder_enabler->published)
2539 list_del(&event_recorder_enabler->node);
2540 kfree(event_recorder_enabler);
2541 break;
2542 }
2543 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2544 {
2545 struct lttng_event_notifier_enabler *event_notifier_enabler =
2546 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2547
44b1abdc
MD		 2548 list_del(&event_notifier_enabler->node);
2549 lttng_enabler_destroy(event_enabler);
2550 kfree(event_notifier_enabler);
2551 break;
2552 }
2553 default:
2554 WARN_ON_ONCE(1);
2555 }
3c997079
MD		 2556}
2557
dffef45d
FD		 2558struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2559 struct lttng_event_notifier_group *event_notifier_group,
2560 enum lttng_enabler_format_type format_type,
606828e4 2561 struct lttng_kernel_abi_event_notifier *event_notifier_param)
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
FD		 2582 event_notifier_enabler->group = event_notifier_group;
2583
2584 mutex_lock(&sessions_mutex);
2585 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2586 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2587
2588 mutex_unlock(&sessions_mutex);
2589
2590 return event_notifier_enabler;
2591}
2592
2593int lttng_event_notifier_enabler_enable(
2594 struct lttng_event_notifier_enabler *event_notifier_enabler)
2595{
2596 mutex_lock(&sessions_mutex);
2597 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2598 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2599 mutex_unlock(&sessions_mutex);
2600 return 0;
2601}
2602
2603int lttng_event_notifier_enabler_disable(
2604 struct lttng_event_notifier_enabler *event_notifier_enabler)
2605{
2606 mutex_lock(&sessions_mutex);
2607 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2608 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2609 mutex_unlock(&sessions_mutex);
2610 return 0;
2611}
2612
99d223ad
FD		 2613int lttng_event_notifier_enabler_attach_capture_bytecode(
2614 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2615 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2616{
d64ca521 2617 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2618 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2619 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2620 uint32_t bytecode_len;
2621 int ret;
2622
2623 ret = get_user(bytecode_len, &bytecode->len);
2624 if (ret)
2625 return ret;
2626
2627 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2628 GFP_KERNEL);
2629 if (!bytecode_node)
2630 return -ENOMEM;
2631
2632 ret = copy_from_user(&bytecode_node->bc, bytecode,
2633 sizeof(*bytecode) + bytecode_len);
2634 if (ret)
2635 goto error_free;
2636
8a445457 2637 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2638 bytecode_node->enabler = enabler;
2639
2640 /* Enforce length based on allocated size */
2641 bytecode_node->bc.len = bytecode_len;
2642 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2643
2644 event_notifier_enabler->num_captures++;
2645
2646 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2647 goto end;
2648
2649error_free:
2650 lttng_kvfree(bytecode_node);
2651end:
2652 return ret;
2653}
2654
3c997079 2655/*
b2bc0bc8 2656 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2657 * session.
2658 * Should be called with sessions mutex held.
2659 */
2660static
8cdc1a81 2661void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2662{
1ae083ba 2663 struct lttng_event_recorder_enabler *event_enabler;
a67ba386 2664 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2665
8cdc1a81 2666 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2667 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2668 /*
2669 * For each event, if at least one of its enablers is enabled,
2670 * and its channel and session transient states are enabled, we
2671 * enable the event, else we disable it.
2672 */
8cdc1a81 2673 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2674 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2675 struct lttng_enabler_ref *enabler_ref;
218585b9 2676 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2677 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2678 int nr_filters = 0;
3c997079 2679
a67ba386 2680 switch (event_recorder_priv->parent.instrumentation) {
c190d76e
MJ		 2681 case LTTNG_KERNEL_ABI_TRACEPOINT:
2682 lttng_fallthrough;
606828e4 2683 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2684 /* Enable events */
2685 list_for_each_entry(enabler_ref,
a67ba386 2686 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2687 if (enabler_ref->ref->enabled) {
2688 enabled = 1;
2689 break;
2690 }
2691 }
4ecb5ad5 2692 break;
b4a75708 2693
4ecb5ad5 2694 default:
3c997079
MD		 2695 /* Not handled with lazy sync. */
2696 continue;
2697 }
2698 /*
2699 * Enabled state is based on union of enablers, with
2700 * intesection of session and channel transient enable
2701 * states.
2702 */
f7d06400 2703 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2704
a67ba386 2705 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2706 /*
2707 * Sync tracepoint registration with event enabled
2708 * state.
2709 */
2710 if (enabled) {
0c851fa0 2711 register_event(&event_recorder->parent);
3c997079 2712 } else {
f0bcc14c 2713 _lttng_event_unregister(&event_recorder->parent);
3c997079 2714 }
07dfc1d0
MD		 2715
2716 /* Check if has enablers without bytecode enabled */
2717 list_for_each_entry(enabler_ref,
a67ba386 2718 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2719 if (enabler_ref->ref->enabled
2720 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2721 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2722 break;
2723 }
2724 }
a67ba386 2725 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2726 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2727
2728 /* Enable filters */
2729 list_for_each_entry(runtime,
e2d5dbc7 2730 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2731 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2732 nr_filters++;
2733 }
2734 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2735 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2736 }
2737}
2738
2739/*
2740 * Apply enablers to session events, adding events to session if need
2741 * be. It is required after each modification applied to an active
2742 * session, and right before session "start".
2743 * "lazy" sync means we only sync if required.
2744 * Should be called with sessions mutex held.
2745 */
2746static
8cdc1a81 2747void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2748{
2749 /* We can skip if session is not active */
2750 if (!session->active)
2751 return;
b2bc0bc8 2752 lttng_session_sync_event_enablers(session);
3c997079
MD		 2753}
2754
b01155ba
FD		 2755static
2756void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2757{
2758 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2759 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2760
2761 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2762 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2763
2764 /*
2765 * For each event_notifier, if at least one of its enablers is enabled,
2766 * we enable the event_notifier, else we disable it.
2767 */
a67ba386
MD		 2768 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2769 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2770 struct lttng_enabler_ref *enabler_ref;
218585b9 2771 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2772 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2773 int nr_filters = 0, nr_captures = 0;
b01155ba 2774
a67ba386 2775 switch (event_notifier_priv->parent.instrumentation) {
c190d76e
MJ		 2776 case LTTNG_KERNEL_ABI_TRACEPOINT:
2777 lttng_fallthrough;
606828e4 2778 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2779 /* Enable event_notifiers */
2780 list_for_each_entry(enabler_ref,
a67ba386 2781 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2782 if (enabler_ref->ref->enabled) {
2783 enabled = 1;
2784 break;
2785 }
2786 }
2787 break;
b4a75708 2788
b01155ba
FD		 2789 default:
2790 /* Not handled with sync. */
2791 continue;
2792 }
2793
a67ba386 2794 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2795 /*
2796 * Sync tracepoint registration with event_notifier enabled
2797 * state.
2798 */
2799 if (enabled) {
a67ba386 2800 if (!event_notifier_priv->parent.registered)
0c851fa0 2801 register_event(&event_notifier->parent);
b01155ba 2802 } else {
a67ba386 2803 if (event_notifier_priv->parent.registered)
f0bcc14c 2804 _lttng_event_unregister(&event_notifier->parent);
b01155ba
FD		 2805 }
2806
2807 /* Check if has enablers without bytecode enabled */
2808 list_for_each_entry(enabler_ref,
a67ba386 2809 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2810 if (enabler_ref->ref->enabled
2811 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2812 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2813 break;
2814 }
2815 }
a67ba386 2816 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2817 has_enablers_without_filter_bytecode;
b01155ba
FD		 2818
2819 /* Enable filters */
2820 list_for_each_entry(runtime,
e2d5dbc7 2821 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2822 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2823 nr_filters++;
2824 }
2825 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2826 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2827
2828 /* Enable captures */
2829 list_for_each_entry(runtime,
e2d5dbc7 2830 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2831 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2832 nr_captures++;
2833 }
2834 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2835 }
2836}
2837
7b25ab0e
MD		 2838static
2839void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2840{
2841 switch (event_enabler->enabler_type) {
2842 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2843 {
2844 struct lttng_event_recorder_enabler *event_recorder_enabler =
2845 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2846 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2847 break;
2848 }
2849 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2850 {
2851 struct lttng_event_notifier_enabler *event_notifier_enabler =
2852 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2853 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2854 break;
2855 }
2856 default:
2857 WARN_ON_ONCE(1);
2858 }
2859}
2860
1ec3f75a 2861/*
d83004aa
JD		 2862 * Serialize at most one packet worth of metadata into a metadata
2863 * channel.
92d9f5e6
MD		 2864 * We grab the metadata cache mutex to get exclusive access to our metadata
2865 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2866 * allows us to do racy operations such as looking for remaining space left in
2867 * packet and write, since mutual exclusion protects us from concurrent writes.
2868 * Mutual exclusion on the metadata cache allow us to read the cache content
2869 * without racing against reallocation of the cache by updates.
35097f36
JD		 2870 * Returns the number of bytes written in the channel, 0 if no data
2871 * was written and a negative value on error.
1ec3f75a 2872 */
b3b8072b 2873int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2874 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2875{
8a57ec02 2876 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2877 int ret = 0;
2878 size_t len, reserve_len;
2879
f613e3e6 2880 /*
92d9f5e6
MD		 2881 * Ensure we support mutiple get_next / put sequences followed by
2882 * put_next. The metadata cache lock protects reading the metadata
2883 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2884 * "flush" operations on the buffer invoked by different processes.
2885 * Moreover, since the metadata cache memory can be reallocated, we
2886 * need to have exclusive access against updates even though we only
2887 * read it.
f613e3e6 2888 */
92d9f5e6 2889 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2890 WARN_ON(stream->metadata_in < stream->metadata_out);
2891 if (stream->metadata_in != stream->metadata_out)
de23d59d 2892 goto end;
f613e3e6 2893
9616f0bf
JD		 2894 /* Metadata regenerated, change the version. */
2895 if (stream->metadata_cache->version != stream->version)
2896 stream->version = stream->metadata_cache->version;
2897
d83004aa 2898 len = stream->metadata_cache->metadata_written -
f613e3e6 2899 stream->metadata_in;
9de2c215 2900 if (!len)
de23d59d 2901 goto end;
d83004aa 2902 reserve_len = min_t(size_t,
4a399b76 2903 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2904 len);
a775608d 2905 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2906 sizeof(char), NULL);
d83004aa
JD		 2907 /*
2908 * If reservation failed, return an error to the caller.
2909 */
c2fb9c1c 2910 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2911 if (ret != 0) {
2912 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2913 stream->coherent = false;
d83004aa
JD		 2914 goto end;
2915 }
b3b8072b 2916 stream->transport->ops.event_write(&ctx,
f613e3e6 2917 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2918 reserve_len, 1);
b3b8072b 2919 stream->transport->ops.event_commit(&ctx);
f613e3e6 2920 stream->metadata_in += reserve_len;
3e75e2a7 2921 if (reserve_len < len)
8b97fd42
MD		 2922 stream->coherent = false;
2923 else
2924 stream->coherent = true;
d83004aa
JD		 2925 ret = reserve_len;
2926
2927end:
8b97fd42
MD		 2928 if (coherent)
2929 *coherent = stream->coherent;
92d9f5e6 2930 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2931 return ret;
2932}
2933
8b97fd42 2934static
8cdc1a81 2935void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2936{
8cdc1a81
MD		 2937 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2938 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2939}
2940
2941static
8cdc1a81 2942void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2943{
8cdc1a81
MD		 2944 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2945 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2946 struct lttng_metadata_stream *stream;
2947
8cdc1a81 2948 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2949 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2950 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2951 }
8b97fd42
MD		 2952}
2953
d83004aa
JD		 2954/*
2955 * Write the metadata to the metadata cache.
2956 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2957 * The metadata cache lock protects us from concurrent read access from
2958 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2959 * The content of the printf is printed as a single atomic metadata
2960 * transaction.
d83004aa 2961 */
8cdc1a81 2962int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2963 const char *fmt, ...)
2964{
c099397a 2965 char *str;
d83004aa 2966 size_t len;
c099397a
MD		 2967 va_list ap;
2968
585e5dcc 2969 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2970
2971 va_start(ap, fmt);
2972 str = kvasprintf(GFP_KERNEL, fmt, ap);
2973 va_end(ap);
2974 if (!str)
2975 return -ENOMEM;
2976
1ec3f75a 2977 len = strlen(str);
8cdc1a81
MD		 2978 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2979 if (session->priv->metadata_cache->metadata_written + len >
2980 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2981 char *tmp_cache_realloc;
2982 unsigned int tmp_cache_alloc_size;
2983
2984 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2985 session->priv->metadata_cache->cache_alloc + len,
2986 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2987 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2988 if (!tmp_cache_realloc)
2989 goto err;
8cdc1a81 2990 if (session->priv->metadata_cache->data) {
a606b6e8 2991 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 2992 session->priv->metadata_cache->data,
2993 session->priv->metadata_cache->cache_alloc);
2994 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 2995 }
2996
8cdc1a81
MD		 2997 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2998 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 2999 }
8cdc1a81
MD		 3000 memcpy(session->priv->metadata_cache->data +
3001 session->priv->metadata_cache->metadata_written,
d83004aa 3002 str, len);
8cdc1a81 3003 session->priv->metadata_cache->metadata_written += len;
c099397a 3004 kfree(str);
d83004aa 3005
d83004aa
JD		 3006 return 0;
3007
3008err:
3009 kfree(str);
3010 return -ENOMEM;
c099397a
MD		 3011}
3012
f513b2bf 3013static
8cdc1a81 3014int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3015{
3016 size_t i;
3017
3018 for (i = 0; i < nesting; i++) {
3019 int ret;
3020
3021 ret = lttng_metadata_printf(session, " ");
3022 if (ret) {
3023 return ret;
3024 }
3025 }
3026 return 0;
3027}
3028
ceabb767 3029static
8cdc1a81 3030int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3031 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3032 size_t nesting)
3033{
3034 return lttng_metadata_printf(session, " _%s;\n", field->name);
3035}
3036
3037static
8cdc1a81 3038int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3039 const struct lttng_kernel_type_integer *type,
3040 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3041 size_t nesting)
3042{
3043 int ret;
3044
ceabb767
MD		 3045 ret = print_tabs(session, nesting);
3046 if (ret)
3047 return ret;
3048 ret = lttng_metadata_printf(session,
3049 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3050 type->size,
3051 type->alignment,
3052 type->signedness,
3053 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3054 ? "none"
437d5aa5 3055 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3056 ? "UTF8"
3057 : "ASCII",
437d5aa5 3058 type->base,
ceabb767 3059#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3060 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3061#else
437d5aa5 3062 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3063#endif
3064 );
3065 return ret;
3066}
3067
f513b2bf
MD		 3068/*
3069 * Must be called with sessions_mutex held.
3070 */
3071static
8cdc1a81 3072int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3073 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3074 size_t nesting)
3075{
51ef4536 3076 const char *prev_field_name = NULL;
f513b2bf
MD		 3077 int ret;
3078 uint32_t i, nr_fields;
ceabb767
MD		 3079 unsigned int alignment;
3080
f513b2bf
MD		 3081 ret = print_tabs(session, nesting);
3082 if (ret)
3083 return ret;
3084 ret = lttng_metadata_printf(session,
3085 "struct {\n");
3086 if (ret)
3087 return ret;
437d5aa5 3088 nr_fields = type->nr_fields;
f513b2bf 3089 for (i = 0; i < nr_fields; i++) {
437d5aa5 3090 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3091
437d5aa5 3092 iter_field = type->fields[i];
51ef4536 3093 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3094 if (ret)
3095 return ret;
3096 }
3097 ret = print_tabs(session, nesting);
3098 if (ret)
3099 return ret;
437d5aa5 3100 alignment = type->alignment;
ceabb767
MD		 3101 if (alignment) {
3102 ret = lttng_metadata_printf(session,
3103 "} align(%u)",
3104 alignment);
3105 } else {
3106 ret = lttng_metadata_printf(session,
3107 "}");
3108 }
f513b2bf
MD		 3109 return ret;
3110}
3111
3112/*
3113 * Must be called with sessions_mutex held.
3114 */
3115static
8cdc1a81 3116int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3117 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3118 size_t nesting)
3119{
3120 int ret;
3121
3122 ret = _lttng_struct_type_statedump(session,
437d5aa5 3123 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3124 if (ret)
3125 return ret;
ceabb767 3126 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3127}
3128
65c85aa6
MD		 3129/*
3130 * Must be called with sessions_mutex held.
3131 */
3132static
8cdc1a81 3133int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3134 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3135 size_t nesting,
3136 const char *prev_field_name)
65c85aa6 3137{
51ef4536 3138 const char *tag_name;
65c85aa6
MD		 3139 int ret;
3140 uint32_t i, nr_choices;
3141
51ef4536
MD		 3142 tag_name = type->tag_name;
3143 if (!tag_name)
3144 tag_name = prev_field_name;
3145 if (!tag_name)
3146 return -EINVAL;
ceabb767
MD		 3147 /*
3148 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3149 */
437d5aa5 3150 if (type->alignment != 0)
ceabb767 3151 return -EINVAL;
65c85aa6
MD		 3152 ret = print_tabs(session, nesting);
3153 if (ret)
3154 return ret;
3155 ret = lttng_metadata_printf(session,
3156 "variant <_%s> {\n",
51ef4536 3157 tag_name);
65c85aa6
MD		 3158 if (ret)
3159 return ret;
437d5aa5 3160 nr_choices = type->nr_choices;
65c85aa6 3161 for (i = 0; i < nr_choices; i++) {
437d5aa5 3162 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3163
437d5aa5 3164 iter_field = type->choices[i];
51ef4536 3165 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3166 if (ret)
3167 return ret;
3168 }
3169 ret = print_tabs(session, nesting);
3170 if (ret)
3171 return ret;
3172 ret = lttng_metadata_printf(session,
3173 "}");
3174 return ret;
3175}
3176
3177/*
3178 * Must be called with sessions_mutex held.
3179 */
3180static
8cdc1a81 3181int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3182 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3183 size_t nesting,
3184 const char *prev_field_name)
65c85aa6
MD		 3185{
3186 int ret;
3187
3188 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3189 lttng_kernel_get_type_variant(field->type), nesting,
3190 prev_field_name);
65c85aa6
MD		 3191 if (ret)
3192 return ret;
ceabb767 3193 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3194}
3195
f513b2bf
MD		 3196/*
3197 * Must be called with sessions_mutex held.
3198 */
3199static
8cdc1a81 3200int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3201 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3202 size_t nesting)
3203{
3204 int ret;
437d5aa5
MD		 3205 const struct lttng_kernel_type_array *array_type;
3206 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3207
437d5aa5
MD		 3208 array_type = lttng_kernel_get_type_array(field->type);
3209 WARN_ON_ONCE(!array_type);
ceabb767 3210
437d5aa5 3211 if (array_type->alignment) {
ceabb767 3212 ret = print_tabs(session, nesting);
f513b2bf
MD		 3213 if (ret)
3214 return ret;
ceabb767
MD		 3215 ret = lttng_metadata_printf(session,
3216 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3217 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3218 field->name);
3219 if (ret)
3220 return ret;
3221 }
3222 /*
3223 * Nested compound types: Only array of structures and variants are
3224 * currently supported.
3225 */
437d5aa5 3226 elem_type = array_type->elem_type;
12bb2edb
MD		 3227 switch (elem_type->type) {
3228 case lttng_kernel_type_integer:
437d5aa5
MD		 3229 case lttng_kernel_type_struct:
3230 case lttng_kernel_type_variant:
3231 ret = _lttng_type_statedump(session, elem_type,
3232 array_type->encoding, nesting);
65c85aa6
MD		 3233 if (ret)
3234 return ret;
3235 break;
ceabb767 3236
f513b2bf
MD		 3237 default:
3238 return -EINVAL;
3239 }
3240 ret = lttng_metadata_printf(session,
3241 " _%s[%u];\n",
3242 field->name,
437d5aa5 3243 array_type->length);
f513b2bf
MD		 3244 return ret;
3245}
3246
3247/*
3248 * Must be called with sessions_mutex held.
3249 */
3250static
8cdc1a81 3251int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3252 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3253 size_t nesting,
3254 const char *prev_field_name)
f513b2bf
MD		 3255{
3256 int ret;
3257 const char *length_name;
437d5aa5
MD		 3258 const struct lttng_kernel_type_sequence *sequence_type;
3259 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3260
437d5aa5
MD		 3261 sequence_type = lttng_kernel_get_type_sequence(field->type);
3262 WARN_ON_ONCE(!sequence_type);
f513b2bf 3263
437d5aa5 3264 length_name = sequence_type->length_name;
51ef4536
MD		 3265 if (!length_name)
3266 length_name = prev_field_name;
3267 if (!length_name)
3268 return -EINVAL;
ceabb767 3269
437d5aa5 3270 if (sequence_type->alignment) {
ceabb767 3271 ret = print_tabs(session, nesting);
f513b2bf
MD		 3272 if (ret)
3273 return ret;
ceabb767
MD		 3274 ret = lttng_metadata_printf(session,
3275 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3276 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3277 field->name);
3278 if (ret)
3279 return ret;
3280 }
3281
3282 /*
3283 * Nested compound types: Only array of structures and variants are
3284 * currently supported.
3285 */
437d5aa5 3286 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3287 switch (elem_type->type) {
3288 case lttng_kernel_type_integer:
437d5aa5
MD		 3289 case lttng_kernel_type_struct:
3290 case lttng_kernel_type_variant:
3291 ret = _lttng_type_statedump(session, elem_type,
3292 sequence_type->encoding, nesting);
65c85aa6
MD		 3293 if (ret)
3294 return ret;
3295 break;
ceabb767 3296
f513b2bf
MD		 3297 default:
3298 return -EINVAL;
3299 }
3300 ret = lttng_metadata_printf(session,
3301 " _%s[ _%s ];\n",
3302 field->name,
51ef4536 3303 length_name);
f513b2bf
MD		 3304 return ret;
3305}
3306
141ddf28
MD		 3307/*
3308 * Must be called with sessions_mutex held.
3309 */
3310static
8cdc1a81 3311int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3312 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3313 size_t nesting)
3314{
d96a4a7a 3315 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3316 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3317 int ret;
3318 unsigned int i, nr_entries;
3319
437d5aa5 3320 container_type = type->container_type;
12bb2edb 3321 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3322 ret = -EINVAL;
3323 goto end;
3324 }
437d5aa5 3325 enum_desc = type->desc;
141ddf28
MD		 3326 nr_entries = enum_desc->nr_entries;
3327
3328 ret = print_tabs(session, nesting);
3329 if (ret)
3330 goto end;
ceabb767
MD		 3331 ret = lttng_metadata_printf(session, "enum : ");
3332 if (ret)
3333 goto end;
437d5aa5
MD		 3334 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3335 lttng_kernel_string_encoding_none, 0);
141ddf28 3336 if (ret)
ceabb767
MD		 3337 goto end;
3338 ret = lttng_metadata_printf(session, " {\n");
3339 if (ret)
3340 goto end;
141ddf28
MD		 3341 /* Dump all entries */
3342 for (i = 0; i < nr_entries; i++) {
437d5aa5 3343 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3344 int j, len;
3345
3346 ret = print_tabs(session, nesting + 1);
3347 if (ret)
3348 goto end;
3349 ret = lttng_metadata_printf(session,
3350 "\"");
3351 if (ret)
3352 goto end;
3353 len = strlen(entry->string);
3354 /* Escape the character '"' */
3355 for (j = 0; j < len; j++) {
3356 char c = entry->string[j];
3357
3358 switch (c) {
3359 case '"':
3360 ret = lttng_metadata_printf(session,
3361 "\\\"");
3362 break;
3363 case '\\':
3364 ret = lttng_metadata_printf(session,
3365 "\\\\");
3366 break;
3367 default:
3368 ret = lttng_metadata_printf(session,
3369 "%c", c);
3370 break;
3371 }
3372 if (ret)
3373 goto end;
3374 }
08ad1061
PP		 3375 ret = lttng_metadata_printf(session, "\"");
3376 if (ret)
3377 goto end;
3378
3379 if (entry->options.is_auto) {
3380 ret = lttng_metadata_printf(session, ",\n");
3381 if (ret)
3382 goto end;
141ddf28 3383 } else {
7c559490
MD		 3384 ret = lttng_metadata_printf(session,
3385 " = ");
3386 if (ret)
3387 goto end;
3388 if (entry->start.signedness)
141ddf28 3389 ret = lttng_metadata_printf(session,
7c559490
MD		 3390 "%lld", (long long) entry->start.value);
3391 else
3392 ret = lttng_metadata_printf(session,
3393 "%llu", entry->start.value);
3394 if (ret)
3395 goto end;
3396 if (entry->start.signedness == entry->end.signedness &&
3397 entry->start.value
3398 == entry->end.value) {
141ddf28 3399 ret = lttng_metadata_printf(session,
7c559490
MD		 3400 ",\n");
3401 } else {
3402 if (entry->end.signedness) {
3403 ret = lttng_metadata_printf(session,
3404 " ... %lld,\n",
3405 (long long) entry->end.value);
3406 } else {
3407 ret = lttng_metadata_printf(session,
3408 " ... %llu,\n",
3409 entry->end.value);
3410 }
141ddf28 3411 }
7c559490
MD		 3412 if (ret)
3413 goto end;
141ddf28 3414 }
141ddf28
MD		 3415 }
3416 ret = print_tabs(session, nesting);
3417 if (ret)
3418 goto end;
ceabb767 3419 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3420end:
3421 return ret;
3422}
3423
d83004aa
JD		 3424/*
3425 * Must be called with sessions_mutex held.
3426 */
c099397a 3427static
8cdc1a81 3428int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3429 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3430 size_t nesting)
3431{
3432 int ret;
437d5aa5 3433 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3434
437d5aa5
MD		 3435 enum_type = lttng_kernel_get_type_enum(field->type);
3436 WARN_ON_ONCE(!enum_type);
3437 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3438 if (ret)
3439 return ret;
3440 return lttng_field_name_statedump(session, field, nesting);
3441}
3442
3443static
8cdc1a81 3444int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3445 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3446 size_t nesting)
3447{
3448 int ret;
3449
437d5aa5
MD		 3450 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3451 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3452 if (ret)
3453 return ret;
3454 return lttng_field_name_statedump(session, field, nesting);
3455}
3456
3457static
8cdc1a81 3458int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3459 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3460 size_t nesting)
3461{
3462 int ret;
3463
ceabb767
MD		 3464 /* Default encoding is UTF8 */
3465 ret = print_tabs(session, nesting);
3466 if (ret)
3467 return ret;
3468 ret = lttng_metadata_printf(session,
3469 "string%s",
437d5aa5 3470 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3471 " { encoding = ASCII; }" : "");
3472 return ret;
3473}
3474
3475static
8cdc1a81 3476int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3477 const struct lttng_kernel_event_field *field,
f513b2bf 3478 size_t nesting)
ceabb767 3479{
437d5aa5 3480 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3481 int ret;
3482
437d5aa5
MD		 3483 string_type = lttng_kernel_get_type_string(field->type);
3484 WARN_ON_ONCE(!string_type);
3485 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3486 if (ret)
3487 return ret;
3488 return lttng_field_name_statedump(session, field, nesting);
3489}
3490
3491/*
3492 * Must be called with sessions_mutex held.
3493 */
3494static
8cdc1a81 3495int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3496 const struct lttng_kernel_type_common *type,
3497 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3498 size_t nesting)
c099397a 3499{
c099397a 3500 int ret = 0;
c099397a 3501
12bb2edb
MD		 3502 switch (type->type) {
3503 case lttng_kernel_type_integer:
437d5aa5
MD		 3504 ret = _lttng_integer_type_statedump(session,
3505 lttng_kernel_get_type_integer(type),
3506 parent_encoding, nesting);
8070f5c0 3507 break;
437d5aa5
MD		 3508 case lttng_kernel_type_enum:
3509 ret = _lttng_enum_type_statedump(session,
3510 lttng_kernel_get_type_enum(type),
3511 nesting);
8070f5c0 3512 break;
12bb2edb 3513 case lttng_kernel_type_string:
437d5aa5
MD		 3514 ret = _lttng_string_type_statedump(session,
3515 lttng_kernel_get_type_string(type),
3516 nesting);
ceabb767 3517 break;
437d5aa5
MD		 3518 case lttng_kernel_type_struct:
3519 ret = _lttng_struct_type_statedump(session,
3520 lttng_kernel_get_type_struct(type),
3521 nesting);
8070f5c0 3522 break;
437d5aa5
MD		 3523 case lttng_kernel_type_variant:
3524 ret = _lttng_variant_type_statedump(session,
3525 lttng_kernel_get_type_variant(type),
51ef4536 3526 nesting, NULL);
ceabb767
MD		 3527 break;
3528
3529 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3530 case lttng_kernel_type_array:
3531 case lttng_kernel_type_sequence:
ceabb767
MD		 3532 default:
3533 WARN_ON_ONCE(1);
3534 return -EINVAL;
8070f5c0 3535 }
ceabb767
MD		 3536 return ret;
3537}
8070f5c0 3538
ceabb767
MD		 3539/*
3540 * Must be called with sessions_mutex held.
3541 */
3542static
8cdc1a81 3543int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3544 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3545 size_t nesting,
3546 const char **prev_field_name_p)
ceabb767 3547{
51ef4536 3548 const char *prev_field_name = NULL;
ceabb767 3549 int ret = 0;
27d2368e 3550
51ef4536
MD		 3551 if (prev_field_name_p)
3552 prev_field_name = *prev_field_name_p;
437d5aa5 3553 switch (field->type->type) {
12bb2edb 3554 case lttng_kernel_type_integer:
ceabb767
MD		 3555 ret = _lttng_integer_field_statedump(session, field, nesting);
3556 break;
437d5aa5 3557 case lttng_kernel_type_enum:
ceabb767 3558 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3559 break;
12bb2edb 3560 case lttng_kernel_type_string:
ceabb767 3561 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3562 break;
437d5aa5 3563 case lttng_kernel_type_struct:
ceabb767 3564 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3565 break;
437d5aa5 3566 case lttng_kernel_type_array:
ceabb767 3567 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3568 break;
437d5aa5 3569 case lttng_kernel_type_sequence:
51ef4536 3570 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3571 break;
437d5aa5 3572 case lttng_kernel_type_variant:
51ef4536 3573 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3574 break;
f513b2bf 3575
8070f5c0
MD		 3576 default:
3577 WARN_ON_ONCE(1);
3578 return -EINVAL;
3579 }
51ef4536
MD		 3580 if (prev_field_name_p)
3581 *prev_field_name_p = field->name;
8070f5c0
MD		 3582 return ret;
3583}
3584
3585static
8cdc1a81 3586int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3587 struct lttng_kernel_ctx *ctx)
8070f5c0 3588{
51ef4536 3589 const char *prev_field_name = NULL;
8070f5c0
MD		 3590 int ret = 0;
3591 int i;
3592
3593 if (!ctx)
3594 return 0;
3595 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3596 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3597
51ef4536 3598 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3599 if (ret)
3600 return ret;
3601 }
3602 return ret;
3603}
3604
3605static
8cdc1a81 3606int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3607 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3608{
51ef4536 3609 const char *prev_field_name = NULL;
a67ba386 3610 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3611 int ret = 0;
3612 int i;
3613
6c8c025b
MD		 3614 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3615 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3616
51ef4536 3617 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3618 if (ret)
3619 return ret;
c099397a
MD		 3620 }
3621 return ret;
3622}
3623
d83004aa
JD		 3624/*
3625 * Must be called with sessions_mutex held.
8b97fd42
MD		 3626 * The entire event metadata is printed as a single atomic metadata
3627 * transaction.
d83004aa 3628 */
c099397a 3629static
8cdc1a81 3630int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3631 struct lttng_kernel_channel_buffer *chan,
a67ba386 3632 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3633{
3634 int ret = 0;
3635
a67ba386 3636 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3637 return 0;
f7d06400 3638 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3639 return 0;
3640
8b97fd42
MD		 3641 lttng_metadata_begin(session);
3642
c099397a
MD		 3643 ret = lttng_metadata_printf(session,
3644 "event {\n"
ae734547 3645 " name = \"%s\";\n"
c099397a 3646 " id = %u;\n"
b9074a1b 3647 " stream_id = %u;\n",
a67ba386
MD		 3648 event_recorder->priv->parent.desc->event_name,
3649 event_recorder->priv->id,
f7d06400 3650 event_recorder->chan->priv->id);
c099397a
MD		 3651 if (ret)
3652 goto end;
3653
8070f5c0 3654 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3655 " fields := struct {\n"
3656 );
3657 if (ret)
3658 goto end;
3659
a67ba386 3660 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3661 if (ret)
3662 goto end;
3663
3664 /*
3665 * LTTng space reservation can only reserve multiples of the
3666 * byte size.
3667 */
3668 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3669 " };\n"
3670 "};\n\n");
c099397a
MD		 3671 if (ret)
3672 goto end;
3673
a67ba386 3674 event_recorder->priv->metadata_dumped = 1;
c099397a 3675end:
8b97fd42 3676 lttng_metadata_end(session);
c099397a
MD		 3677 return ret;
3678
3679}
3680
d83004aa
JD		 3681/*
3682 * Must be called with sessions_mutex held.
8b97fd42
MD		 3683 * The entire channel metadata is printed as a single atomic metadata
3684 * transaction.
d83004aa 3685 */
c099397a 3686static
8cdc1a81 3687int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3688 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3689{
3690 int ret = 0;
3691
f7d06400 3692 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3693 return 0;
d83004aa 3694
f7d06400 3695 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3696 return 0;
3697
8b97fd42
MD		 3698 lttng_metadata_begin(session);
3699
f7d06400 3700 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3701 ret = lttng_metadata_printf(session,
3702 "stream {\n"
3703 " id = %u;\n"
9115fbdc 3704 " event.header := %s;\n"
b9074a1b 3705 " packet.context := struct packet_context;\n",
f7d06400
MD		 3706 chan->priv->id,
3707 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3708 "struct event_header_large");
3709 if (ret)
3710 goto end;
3711
f7d06400 3712 if (chan->priv->ctx) {
b9074a1b
MD		 3713 ret = lttng_metadata_printf(session,
3714 " event.context := struct {\n");
3715 if (ret)
3716 goto end;
3717 }
f7d06400 3718 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3719 if (ret)
3720 goto end;
f7d06400 3721 if (chan->priv->ctx) {
b9074a1b
MD		 3722 ret = lttng_metadata_printf(session,
3723 " };\n");
3724 if (ret)
3725 goto end;
3726 }
8070f5c0
MD		 3727
3728 ret = lttng_metadata_printf(session,
b9074a1b 3729 "};\n\n");
8070f5c0 3730
f7d06400 3731 chan->priv->metadata_dumped = 1;
c099397a 3732end:
8b97fd42 3733 lttng_metadata_end(session);
c099397a
MD		 3734 return ret;
3735}
3736
d83004aa
JD		 3737/*
3738 * Must be called with sessions_mutex held.
3739 */
9115fbdc 3740static
8cdc1a81 3741int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3742{
3743 return lttng_metadata_printf(session,
3744 "struct packet_context {\n"
a3ccff4f
MD		 3745 " uint64_clock_monotonic_t timestamp_begin;\n"
3746 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3747 " uint64_t content_size;\n"
3748 " uint64_t packet_size;\n"
5b3cf4f9 3749 " uint64_t packet_seq_num;\n"
a9afe705 3750 " unsigned long events_discarded;\n"
9115fbdc 3751 " uint32_t cpu_id;\n"
c6dfdf6f 3752 "};\n\n"
9115fbdc
MD		 3753 );
3754}
3755
3756/*
3757 * Compact header:
3758 * id: range: 0 - 30.
3759 * id 31 is reserved to indicate an extended header.
3760 *
3761 * Large header:
3762 * id: range: 0 - 65534.
3763 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3764 *
3765 * Must be called with sessions_mutex held.
9115fbdc
MD		 3766 */
3767static
8cdc1a81 3768int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3769{
3770 return lttng_metadata_printf(session,
3771 "struct event_header_compact {\n"
3772 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3773 " variant <id> {\n"
3774 " struct {\n"
a3ccff4f 3775 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3776 " } compact;\n"
3777 " struct {\n"
3778 " uint32_t id;\n"
a3ccff4f 3779 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3780 " } extended;\n"
3781 " } v;\n"
3782 "} align(%u);\n"
3783 "\n"
3784 "struct event_header_large {\n"
3785 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3786 " variant <id> {\n"
3787 " struct {\n"
a3ccff4f 3788 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3789 " } compact;\n"
3790 " struct {\n"
3791 " uint32_t id;\n"
a3ccff4f 3792 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3793 " } extended;\n"
3794 " } v;\n"
3795 "} align(%u);\n\n",
a90917c3
MD		 3796 lttng_alignof(uint32_t) * CHAR_BIT,
3797 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3798 );
3799}
3800
a3ccff4f
MD		 3801 /*
3802 * Approximation of NTP time of day to clock monotonic correlation,
3803 * taken at start of trace.
3804 * Yes, this is only an approximation. Yes, we can (and will) do better
3805 * in future versions.
5283350b
MD		 3806 * This function may return a negative offset. It may happen if the
3807 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3808 *
3809 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3810 * y2038 compliant.
a3ccff4f
MD		 3811 */
3812static
8967b2a3 3813int64_t measure_clock_offset(void)
a3ccff4f 3814{
dcb93448 3815 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3816 uint64_t tcf = trace_clock_freq();
dcb93448 3817 int64_t offset;
a3ccff4f 3818 unsigned long flags;
3636085f
MJ		 3819#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3820 struct timespec64 rts = { 0, 0 };
3821#else
3822 struct timespec rts = { 0, 0 };
3823#endif
a3ccff4f
MD		 3824
3825 /* Disable interrupts to increase correlation precision. */
3826 local_irq_save(flags);
3827 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3828#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3829 ktime_get_real_ts64(&rts);
3830#else
216b6baa 3831 getnstimeofday(&rts);
3636085f 3832#endif
a3ccff4f
MD		 3833 monotonic[1] = trace_clock_read64();
3834 local_irq_restore(flags);
3835
dcb93448 3836 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3837 realtime = (uint64_t) rts.tv_sec * tcf;
3838 if (tcf == NSEC_PER_SEC) {
3839 realtime += rts.tv_nsec;
3840 } else {
3841 uint64_t n = rts.tv_nsec * tcf;
3842
3843 do_div(n, NSEC_PER_SEC);
3844 realtime += n;
3845 }
dcb93448 3846 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3847 return offset;
3848}
3849
3eb95be4 3850static
8cdc1a81 3851int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3852{
0f3eaad4 3853 int ret = 0;
3eb95be4
JR		 3854 size_t i;
3855 char cur;
3856
3857 i = 0;
3858 cur = string[i];
3859 while (cur != '\0') {
3860 switch (cur) {
3861 case '\n':
3862 ret = lttng_metadata_printf(session, "%s", "\\n");
3863 break;
3864 case '\\':
3865 case '"':
3866 ret = lttng_metadata_printf(session, "%c", '\\');
3867 if (ret)
3868 goto error;
3869 /* We still print the current char */
c190d76e 3870 lttng_fallthrough;
3eb95be4
JR		 3871 default:
3872 ret = lttng_metadata_printf(session, "%c", cur);
3873 break;
3874 }
3875
3876 if (ret)
3877 goto error;
3878
3879 cur = string[++i];
3880 }
3881error:
3882 return ret;
3883}
3884
3885static
8cdc1a81 3886int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3887 const char *field_value)
3eb95be4
JR		 3888{
3889 int ret;
3890
1c88f269 3891 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3892 if (ret)
3893 goto error;
3894
1c88f269 3895 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3896 if (ret)
3897 goto error;
3898
3899 ret = lttng_metadata_printf(session, "\";\n");
3900
3901error:
3902 return ret;
3903}
3904
c099397a
MD		 3905/*
3906 * Output metadata into this session's metadata buffers.
d83004aa 3907 * Must be called with sessions_mutex held.
c099397a
MD		 3908 */
3909static
8cdc1a81 3910int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3911{
8cdc1a81 3912 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3913 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3914 const char *product_uuid;
f7d06400 3915 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3916 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3917 int ret = 0;
3918
585e5dcc 3919 if (!LTTNG_READ_ONCE(session->active))
c099397a 3920 return 0;
8b97fd42
MD		 3921
3922 lttng_metadata_begin(session);
3923
8cdc1a81 3924 if (session->priv->metadata_dumped)
c099397a 3925 goto skip_session;
c099397a 3926
d793d5e1 3927 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3928 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3929 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3930 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3931 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3932 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3933
3934 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3935 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3936 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3937 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3938 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3939 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3940 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3941 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3942 "\n"
3943 "trace {\n"
3944 " major = %u;\n"
3945 " minor = %u;\n"
30bdb6e4 3946 " uuid = \"%s\";\n"
d793d5e1
MD		 3947 " byte_order = %s;\n"
3948 " packet.header := struct {\n"
3949 " uint32_t magic;\n"
1ec3f75a 3950 " uint8_t uuid[16];\n"
d793d5e1 3951 " uint32_t stream_id;\n"
5594698f 3952 " uint64_t stream_instance_id;\n"
0eb25f58 3953 " };\n"
d793d5e1 3954 "};\n\n",
a90917c3
MD		 3955 lttng_alignof(uint8_t) * CHAR_BIT,
3956 lttng_alignof(uint16_t) * CHAR_BIT,
3957 lttng_alignof(uint32_t) * CHAR_BIT,
3958 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3959 sizeof(unsigned long) * CHAR_BIT,
3960 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3961 CTF_SPEC_MAJOR,
3962 CTF_SPEC_MINOR,
d793d5e1 3963 uuid_s,
5214fa50 3964#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3965 "be"
3966#else
3967 "le"
3968#endif
3969 );
3970 if (ret)
3971 goto end;
3972
99dc9597
MD		 3973 ret = lttng_metadata_printf(session,
3974 "env {\n"
a6058143 3975 " hostname = \"%s\";\n"
c6c9e10f 3976 " domain = \"kernel\";\n"
99dc9597 3977 " sysname = \"%s\";\n"
c6c9e10f
MD		 3978 " kernel_release = \"%s\";\n"
3979 " kernel_version = \"%s\";\n"
3980 " tracer_name = \"lttng-modules\";\n"
3981 " tracer_major = %d;\n"
3982 " tracer_minor = %d;\n"
3983 " tracer_patchlevel = %d;\n"
3eb95be4 3984 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3985 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3986 utsname()->sysname,
3987 utsname()->release,
c6c9e10f
MD		 3988 utsname()->version,
3989 LTTNG_MODULES_MAJOR_VERSION,
3990 LTTNG_MODULES_MINOR_VERSION,
3991 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3992 );
3993 if (ret)
3994 goto end;
3995
8cdc1a81 3996 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 3997 if (ret)
3998 goto end;
3999 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4000 session->priv->creation_time);
3eb95be4
JR		 4001 if (ret)
4002 goto end;
4003
c88f762e
GB		 4004 /* Add the product UUID to the 'env' section */
4005 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4006 if (product_uuid) {
4007 ret = lttng_metadata_printf(session,
4008 " product_uuid = \"%s\";\n",
4009 product_uuid
4010 );
4011 if (ret)
4012 goto end;
4013 }
4014
4015 /* Close the 'env' section */
3eb95be4
JR		 4016 ret = lttng_metadata_printf(session, "};\n\n");
4017 if (ret)
4018 goto end;
4019
a3ccff4f
MD		 4020 ret = lttng_metadata_printf(session,
4021 "clock {\n"
2754583e
MD		 4022 " name = \"%s\";\n",
4023 trace_clock_name()
a82c63f1
MD		 4024 );
4025 if (ret)
4026 goto end;
4027
4028 if (!trace_clock_uuid(clock_uuid_s)) {
4029 ret = lttng_metadata_printf(session,
7c27cb17 4030 " uuid = \"%s\";\n",
a82c63f1
MD		 4031 clock_uuid_s
4032 );
4033 if (ret)
4034 goto end;
4035 }
4036
4037 ret = lttng_metadata_printf(session,
2754583e 4038 " description = \"%s\";\n"
a3ccff4f
MD		 4039 " freq = %llu; /* Frequency, in Hz */\n"
4040 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4041 " offset = %lld;\n"
a3ccff4f 4042 "};\n\n",
2754583e 4043 trace_clock_description(),
a3ccff4f 4044 (unsigned long long) trace_clock_freq(),
8967b2a3 4045 (long long) measure_clock_offset()
a3ccff4f
MD		 4046 );
4047 if (ret)
4048 goto end;
4049
4050 ret = lttng_metadata_printf(session,
4051 "typealias integer {\n"
4052 " size = 27; align = 1; signed = false;\n"
2754583e 4053 " map = clock.%s.value;\n"
a3ccff4f
MD		 4054 "} := uint27_clock_monotonic_t;\n"
4055 "\n"
4056 "typealias integer {\n"
4057 " size = 32; align = %u; signed = false;\n"
2754583e 4058 " map = clock.%s.value;\n"
a3ccff4f
MD		 4059 "} := uint32_clock_monotonic_t;\n"
4060 "\n"
4061 "typealias integer {\n"
4062 " size = 64; align = %u; signed = false;\n"
2754583e 4063 " map = clock.%s.value;\n"
a3ccff4f 4064 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4065 trace_clock_name(),
a3ccff4f 4066 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4067 trace_clock_name(),
4068 lttng_alignof(uint64_t) * CHAR_BIT,
4069 trace_clock_name()
a3ccff4f
MD		 4070 );
4071 if (ret)
4072 goto end;
4073
a90917c3 4074 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4075 if (ret)
4076 goto end;
4077
a90917c3 4078 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4079 if (ret)
4080 goto end;
4081
c099397a 4082skip_session:
f7d06400
MD		 4083 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4084 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4085 if (ret)
4086 goto end;
4087 }
4088
8cdc1a81 4089 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386
MD		 4090 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4091 event_recorder_priv->pub);
c099397a
MD		 4092 if (ret)
4093 goto end;
4094 }
8cdc1a81 4095 session->priv->metadata_dumped = 1;
c099397a 4096end:
8b97fd42 4097 lttng_metadata_end(session);
c099397a
MD		 4098 return ret;
4099}
4100
c0e31d2e 4101/**
a90917c3 4102 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4103 * @transport: transport structure
4104 *
4105 * Registers a transport which can be used as output to extract the data out of
4106 * LTTng. The module calling this registration function must ensure that no
4107 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4108 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4109 * is made visible to the transport function. This registration acts as a
263b6c88 4110 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4111 * after its registration must it synchronize the TLBs.
4112 */
a90917c3 4113void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4114{
4115 /*
4116 * Make sure no page fault can be triggered by the module about to be
4117 * registered. We deal with this here so we don't have to call
263b6c88 4118 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4119 */
263b6c88 4120 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4121
4122 mutex_lock(&sessions_mutex);
a90917c3 4123 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4124 mutex_unlock(&sessions_mutex);
4125}
a90917c3 4126EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4127
4128/**
a90917c3 4129 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4130 * @transport: transport structure
4131 */
a90917c3 4132void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4133{
4134 mutex_lock(&sessions_mutex);
4135 list_del(&transport->node);
4136 mutex_unlock(&sessions_mutex);
4137}
a90917c3 4138EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4139
a101fa10
MD		 4140void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4141{
4142 /*
4143 * Make sure no page fault can be triggered by the module about to be
4144 * registered. We deal with this here so we don't have to call
4145 * vmalloc_sync_mappings() in each module's init.
4146 */
4147 wrapper_vmalloc_sync_mappings();
4148
4149 mutex_lock(&sessions_mutex);
4150 list_add_tail(&transport->node, &lttng_counter_transport_list);
4151 mutex_unlock(&sessions_mutex);
4152}
4153EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4154
4155void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4156{
4157 mutex_lock(&sessions_mutex);
4158 list_del(&transport->node);
4159 mutex_unlock(&sessions_mutex);
4160}
4161EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4162
5f4c791e 4163#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4164
4165enum cpuhp_state lttng_hp_prepare;
4166enum cpuhp_state lttng_hp_online;
4167
4168static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4169{
4170 struct lttng_cpuhp_node *lttng_node;
4171
4172 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4173 switch (lttng_node->component) {
4174 case LTTNG_RING_BUFFER_FRONTEND:
4175 return 0;
4176 case LTTNG_RING_BUFFER_BACKEND:
4177 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4178 case LTTNG_RING_BUFFER_ITER:
4179 return 0;
4180 case LTTNG_CONTEXT_PERF_COUNTERS:
4181 return 0;
4182 default:
4183 return -EINVAL;
4184 }
4185}
4186
4187static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4188{
4189 struct lttng_cpuhp_node *lttng_node;
4190
4191 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4192 switch (lttng_node->component) {
4193 case LTTNG_RING_BUFFER_FRONTEND:
4194 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4195 case LTTNG_RING_BUFFER_BACKEND:
4196 return 0;
4197 case LTTNG_RING_BUFFER_ITER:
4198 return 0;
4199 case LTTNG_CONTEXT_PERF_COUNTERS:
4200 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4201 default:
4202 return -EINVAL;
4203 }
4204}
4205
4206static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4207{
4208 struct lttng_cpuhp_node *lttng_node;
4209
4210 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4211 switch (lttng_node->component) {
4212 case LTTNG_RING_BUFFER_FRONTEND:
4213 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4214 case LTTNG_RING_BUFFER_BACKEND:
4215 return 0;
4216 case LTTNG_RING_BUFFER_ITER:
4217 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4218 case LTTNG_CONTEXT_PERF_COUNTERS:
4219 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4220 default:
4221 return -EINVAL;
4222 }
4223}
4224
4225static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4226{
4227 struct lttng_cpuhp_node *lttng_node;
4228
4229 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4230 switch (lttng_node->component) {
4231 case LTTNG_RING_BUFFER_FRONTEND:
4232 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4233 case LTTNG_RING_BUFFER_BACKEND:
4234 return 0;
4235 case LTTNG_RING_BUFFER_ITER:
4236 return 0;
4237 case LTTNG_CONTEXT_PERF_COUNTERS:
4238 return 0;
4239 default:
4240 return -EINVAL;
4241 }
4242}
4243
4244static int __init lttng_init_cpu_hotplug(void)
4245{
4246 int ret;
4247
4248 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4249 lttng_hotplug_prepare,
4250 lttng_hotplug_dead);
4251 if (ret < 0) {
4252 return ret;
4253 }
4254 lttng_hp_prepare = ret;
4255 lttng_rb_set_hp_prepare(ret);
4256
4257 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4258 lttng_hotplug_online,
4259 lttng_hotplug_offline);
4260 if (ret < 0) {
4261 cpuhp_remove_multi_state(lttng_hp_prepare);
4262 lttng_hp_prepare = 0;
4263 return ret;
4264 }
4265 lttng_hp_online = ret;
4266 lttng_rb_set_hp_online(ret);
4267
4268 return 0;
4269}
4270
4271static void __exit lttng_exit_cpu_hotplug(void)
4272{
4273 lttng_rb_set_hp_online(0);
4274 cpuhp_remove_multi_state(lttng_hp_online);
4275 lttng_rb_set_hp_prepare(0);
4276 cpuhp_remove_multi_state(lttng_hp_prepare);
4277}
4278
5f4c791e 4279#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4280static int lttng_init_cpu_hotplug(void)
4281{
4282 return 0;
4283}
4284static void lttng_exit_cpu_hotplug(void)
4285{
4286}
5f4c791e 4287#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4288
a90917c3 4289static int __init lttng_events_init(void)
4e3c1b9b 4290{
1c25284c
MD		 4291 int ret;
4292
453b2495
JD		 4293 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4294 if (ret)
4295 return ret;
389d7070 4296 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4297 if (ret)
4298 return ret;
4299 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4300 if (ret)
4301 return ret;
4302 ret = lttng_probes_init();
389d7070
MD		 4303 if (ret)
4304 return ret;
07dfc1d0 4305 ret = lttng_context_init();
20591cf7
MD		 4306 if (ret)
4307 return ret;
07dfc1d0
MD		 4308 ret = lttng_tracepoint_init();
4309 if (ret)
4310 goto error_tp;
a67ba386
MD		 4311 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4312 if (!event_recorder_cache) {
20591cf7 4313 ret = -ENOMEM;
a67ba386 4314 goto error_kmem_event_recorder;
dffef45d 4315 }
a67ba386
MD		 4316 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4317 if (!event_recorder_private_cache) {
4318 ret = -ENOMEM;
4319 goto error_kmem_event_recorder_private;
4320 }
4321 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4322 if (!event_notifier_cache) {
4323 ret = -ENOMEM;
4324 goto error_kmem_event_notifier;
20591cf7 4325 }
a67ba386
MD		 4326 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4327 if (!event_notifier_private_cache) {
4328 ret = -ENOMEM;
4329 goto error_kmem_event_notifier_private;
4330 }
80996790 4331 ret = lttng_abi_init();
02119ee5
MD		 4332 if (ret)
4333 goto error_abi;
0c956676
MD		 4334 ret = lttng_logger_init();
4335 if (ret)
4336 goto error_logger;
1e367326
MD		 4337 ret = lttng_init_cpu_hotplug();
4338 if (ret)
4339 goto error_hotplug;
101215b7 4340 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4341 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4342 __stringify(LTTNG_MODULES_MINOR_VERSION),
4343 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4344 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4345 LTTNG_VERSION_NAME,
4346#ifdef LTTNG_EXTRA_VERSION_GIT
4347 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4348#else
4349 "",
4350#endif
4351#ifdef LTTNG_EXTRA_VERSION_NAME
4352 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4353#else
4354 "");
4355#endif
c1551e57
MJ		 4356#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4357 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4358#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4359 return 0;
0c956676 4360
1e367326
MD		 4361error_hotplug:
4362 lttng_logger_exit();
0c956676
MD		 4363error_logger:
4364 lttng_abi_exit();
02119ee5 4365error_abi:
a67ba386
MD		 4366 kmem_cache_destroy(event_notifier_private_cache);
4367error_kmem_event_notifier_private:
dffef45d
FD		 4368 kmem_cache_destroy(event_notifier_cache);
4369error_kmem_event_notifier:
a67ba386
MD		 4370 kmem_cache_destroy(event_recorder_private_cache);
4371error_kmem_event_recorder_private:
4372 kmem_cache_destroy(event_recorder_cache);
4373error_kmem_event_recorder:
20591cf7 4374 lttng_tracepoint_exit();
07dfc1d0
MD		 4375error_tp:
4376 lttng_context_exit();
101215b7 4377 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4378 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4379 __stringify(LTTNG_MODULES_MINOR_VERSION),
4380 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4381 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4382 LTTNG_VERSION_NAME,
4383#ifdef LTTNG_EXTRA_VERSION_GIT
4384 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4385#else
4386 "",
4387#endif
4388#ifdef LTTNG_EXTRA_VERSION_NAME
4389 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4390#else
4391 "");
4392#endif
1c25284c 4393 return ret;
4e3c1b9b
MD		 4394}
4395
a90917c3 4396module_init(lttng_events_init);
11b5a3c2 4397
a90917c3 4398static void __exit lttng_events_exit(void)
4e3c1b9b 4399{
8cdc1a81 4400 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4401
1e367326 4402 lttng_exit_cpu_hotplug();
0c956676 4403 lttng_logger_exit();
80996790 4404 lttng_abi_exit();
8cdc1a81
MD		 4405 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4406 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4407 kmem_cache_destroy(event_recorder_cache);
4408 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4409 kmem_cache_destroy(event_notifier_cache);
a67ba386 4410 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4411 lttng_tracepoint_exit();
07dfc1d0 4412 lttng_context_exit();
101215b7 4413 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4414 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4415 __stringify(LTTNG_MODULES_MINOR_VERSION),
4416 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4417 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4418 LTTNG_VERSION_NAME,
4419#ifdef LTTNG_EXTRA_VERSION_GIT
4420 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4421#else
4422 "",
4423#endif
4424#ifdef LTTNG_EXTRA_VERSION_NAME
4425 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4426#else
4427 "");
4428#endif
4e3c1b9b 4429}
92e94819 4430
a90917c3 4431module_exit(lttng_events_exit);
11b5a3c2 4432
7ca11e77 4433#include <generated/patches.h>
101215b7
MJ		 4434#ifdef LTTNG_EXTRA_VERSION_GIT
4435MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4436#endif
4437#ifdef LTTNG_EXTRA_VERSION_NAME
4438MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4439#endif
92e94819
MD		 4440MODULE_LICENSE("GPL and additional rights");
4441MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4442MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4443MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4444 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4445 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4446 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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