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Refactoring: combine create event 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);
33af697f
MD		 324 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
325 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
dffef45d 326
750b05f2
FD		 327 list_add(&event_notifier_group->node, &event_notifier_groups);
328
329 mutex_unlock(&sessions_mutex);
330
331 return event_notifier_group;
332
333create_error:
334 lttng_kvfree(event_notifier_group);
335nomem:
336 if (transport)
337 module_put(transport->owner);
338notransport:
339 mutex_unlock(&sessions_mutex);
340 return NULL;
341}
342
d83004aa
JD		 343void metadata_cache_destroy(struct kref *kref)
344{
345 struct lttng_metadata_cache *cache =
346 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 347 vfree(cache->data);
d83004aa 348 kfree(cache);
4e3c1b9b
MD		 349}
350
8cdc1a81 351void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 352{
f7d06400 353 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 354 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 355 struct lttng_metadata_stream *metadata_stream;
44b1abdc 356 struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler;
dda6a249 357 int ret;
4e3c1b9b
MD		 358
359 mutex_lock(&sessions_mutex);
a8f2d0c7 360 WRITE_ONCE(session->active, 0);
f7d06400 361 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 362 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 363 WARN_ON(ret);
364 }
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 */
83006ee0 875static
1ae083ba 876struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 877 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 878{
0def9170 879 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
def1e304 880 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
5b9817ae 881 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
def1e304 882 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
a67ba386
MD		 883 struct lttng_kernel_event_recorder *event_recorder;
884 struct lttng_kernel_event_recorder_private *event_recorder_priv;
19bef247 885 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 886 const char *event_name;
887 struct hlist_head *head;
3d084699 888 int ret;
4e3c1b9b 889
f7d06400 890 if (chan->priv->free_event_id == -1U) {
4cf0bf51 891 ret = -EMFILE;
e5382b6d 892 goto full;
abc0446a 893 }
3c997079
MD		 894
895 switch (itype) {
606828e4 896 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 897 event_name = event_desc->event_name;
3c997079 898 break;
b4a75708 899
c190d76e
MJ		 900 case LTTNG_KERNEL_ABI_KPROBE:
901 lttng_fallthrough;
902 case LTTNG_KERNEL_ABI_UPROBE:
903 lttng_fallthrough;
904 case LTTNG_KERNEL_ABI_KRETPROBE:
905 lttng_fallthrough;
606828e4 906 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 907 event_name = event_param->name;
908 break;
b4a75708 909
c190d76e
MJ		 910 case LTTNG_KERNEL_ABI_FUNCTION:
911 lttng_fallthrough;
912 case LTTNG_KERNEL_ABI_NOOP:
913 lttng_fallthrough;
3c997079
MD		 914 default:
915 WARN_ON_ONCE(1);
916 ret = -EINVAL;
917 goto type_error;
918 }
4a11ef1c 919
0def9170 920 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247
MD		 921 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
922 event_recorder_priv = container_of(event_priv, struct lttng_kernel_event_recorder_private, parent);
923
924 WARN_ON_ONCE(!event_priv->desc);
925 if (!strncmp(event_priv->desc->event_name, event_name,
606828e4 926 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 927 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 928 ret = -EEXIST;
929 goto exist;
abc0446a
MD		 930 }
931 }
3c997079 932
a67ba386
MD		 933 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
934 if (!event_recorder) {
4cf0bf51 935 ret = -ENOMEM;
4e3c1b9b 936 goto cache_error;
abc0446a 937 }
a67ba386
MD		 938 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
939 if (!event_recorder_priv) {
940 ret = -ENOMEM;
941 goto cache_private_error;
942 }
943 event_recorder_priv->pub = event_recorder;
944 event_recorder_priv->parent.pub = &event_recorder->parent;
945 event_recorder->priv = event_recorder_priv;
946 event_recorder->parent.priv = &event_recorder_priv->parent;
947 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
948
8a445457 949 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 950 event_recorder->chan = chan;
f7d06400 951 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 952 event_recorder->priv->parent.instrumentation = itype;
953 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
954 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 955
956 switch (itype) {
606828e4 957 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 958 /* Event will be enabled by enabler sync. */
a67ba386
MD		 959 event_recorder->parent.enabled = 0;
960 event_recorder->priv->parent.registered = 0;
961 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
962 if (!event_recorder->priv->parent.desc) {
4cf0bf51 963 ret = -ENOENT;
d3dbe23c 964 goto register_error;
abc0446a 965 }
3c997079
MD		 966 /* Populate lttng_event structure before event registration. */
967 smp_wmb();
baf20995 968 break;
b4a75708 969
606828e4 970 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 971 /*
972 * Needs to be explicitly enabled after creation, since
973 * we may want to apply filters.
974 */
a67ba386
MD		 975 event_recorder->parent.enabled = 0;
976 event_recorder->priv->parent.registered = 1;
3c997079
MD		 977 /*
978 * Populate lttng_event structure before event
979 * registration.
980 */
981 smp_wmb();
8bf17deb 982 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 983 event_param->u.kprobe.symbol_name,
984 event_param->u.kprobe.offset,
985 event_param->u.kprobe.addr,
6a35e5bd 986 &event_recorder->parent);
abc0446a 987 if (ret) {
4cf0bf51 988 ret = -EINVAL;
d6d808f3 989 goto register_error;
abc0446a 990 }
a67ba386 991 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 992 WARN_ON_ONCE(!ret);
d6d808f3 993 break;
b4a75708 994
606828e4 995 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 996 {
a67ba386
MD		 997 struct lttng_kernel_event_recorder *event_recorder_return;
998 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 999
1000 /* kretprobe defines 2 events */
a0493bef
MD		 1001 /*
1002 * Needs to be explicitly enabled after creation, since
1003 * we may want to apply filters.
1004 */
a67ba386
MD		 1005 event_recorder->parent.enabled = 0;
1006 event_recorder->priv->parent.registered = 1;
1007
1008 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
1009 if (!event_recorder_return) {
1010 ret = -ENOMEM;
1011 goto register_error;
1012 }
1013 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1014 if (!event_recorder_return_priv) {
1015 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1016 ret = -ENOMEM;
7371f44c 1017 goto register_error;
abc0446a 1018 }
a67ba386
MD		 1019 event_recorder_return_priv->pub = event_recorder_return;
1020 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1021 event_recorder_return->priv = event_recorder_return_priv;
1022 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1023 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1024
8a445457 1025 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 1026 event_recorder_return->chan = chan;
f7d06400 1027 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 1028 event_recorder_return->priv->parent.instrumentation = itype;
1029 event_recorder_return->parent.enabled = 0;
1030 event_recorder_return->priv->parent.registered = 1;
1031 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1032 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1033 /*
a90917c3 1034 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1035 */
1036 smp_wmb();
3c997079 1037 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1038 event_param->u.kretprobe.symbol_name,
1039 event_param->u.kretprobe.offset,
1040 event_param->u.kretprobe.addr,
eb6b47db 1041 &event_recorder->parent, &event_recorder_return->parent);
7371f44c 1042 if (ret) {
a67ba386
MD		 1043 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1044 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1045 ret = -EINVAL;
7371f44c
MD		 1046 goto register_error;
1047 }
1048 /* Take 2 refs on the module: one per event. */
a67ba386 1049 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1050 WARN_ON_ONCE(!ret);
a67ba386 1051 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1052 WARN_ON_ONCE(!ret);
f7d06400 1053 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1054 event_recorder_return);
abc0446a 1055 WARN_ON_ONCE(ret > 0);
7371f44c 1056 if (ret) {
a67ba386
MD		 1057 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1058 kmem_cache_free(event_recorder_cache, event_recorder_return);
1059 module_put(event_recorder_return->priv->parent.desc->owner);
1060 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1061 goto statedump_error;
1062 }
f7d06400 1063 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
7371f44c
MD		 1064 break;
1065 }
b4a75708 1066
606828e4 1067 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1068 /*
1069 * Needs to be explicitly enabled after creation, since
1070 * we may want to apply filters.
1071 */
a67ba386
MD		 1072 event_recorder->parent.enabled = 0;
1073 event_recorder->priv->parent.registered = 0;
1074 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1075 switch (event_param->u.syscall.entryexit) {
606828e4 1076 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1077 ret = -EINVAL;
1078 goto register_error;
606828e4 1079 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1080 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1081 break;
606828e4 1082 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1083 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1084 break;
1085 }
1086 switch (event_param->u.syscall.abi) {
606828e4 1087 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1088 ret = -EINVAL;
1089 goto register_error;
606828e4 1090 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1091 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1092 break;
606828e4 1093 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1094 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1095 break;
1096 }
a67ba386 1097 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1098 ret = -EINVAL;
259b6cb3 1099 goto register_error;
abc0446a 1100 }
1ec65de1 1101 break;
b4a75708 1102
606828e4 1103 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1104 /*
1105 * Needs to be explicitly enabled after creation, since
1106 * we may want to apply filters.
1107 */
a67ba386
MD		 1108 event_recorder->parent.enabled = 0;
1109 event_recorder->priv->parent.registered = 1;
3aed4dca 1110
a344f64b
FD		 1111 /*
1112 * Populate lttng_event structure before event
1113 * registration.
1114 */
1115 smp_wmb();
149b9a9d 1116
83b802dc 1117 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1118 event_param->u.uprobe.fd,
17806c46 1119 &event_recorder->parent);
149b9a9d
YB		 1120 if (ret)
1121 goto register_error;
a67ba386 1122 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1123 WARN_ON_ONCE(!ret);
1124 break;
b4a75708 1125
c190d76e
MJ		 1126 case LTTNG_KERNEL_ABI_FUNCTION:
1127 lttng_fallthrough;
1128 case LTTNG_KERNEL_ABI_NOOP:
1129 lttng_fallthrough;
baf20995
MD		 1130 default:
1131 WARN_ON_ONCE(1);
4cf0bf51 1132 ret = -EINVAL;
df07930b 1133 goto register_error;
baf20995 1134 }
f7d06400 1135 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1136 WARN_ON_ONCE(ret > 0);
1137 if (ret) {
c099397a 1138 goto statedump_error;
abc0446a 1139 }
19bef247 1140 hlist_add_head(&event_recorder->priv->parent.hlist_node, head);
f7d06400 1141 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
a67ba386 1142 return event_recorder;
4e3c1b9b 1143
c099397a 1144statedump_error:
259b6cb3 1145 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1146register_error:
a67ba386
MD		 1147 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1148cache_private_error:
1149 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1150cache_error:
1151exist:
3c997079 1152type_error:
e5382b6d 1153full:
4cf0bf51 1154 return ERR_PTR(ret);
4e3c1b9b
MD		 1155}
1156
83006ee0
MD		 1157static
1158struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler,
1bbb5b2d 1159 const struct lttng_kernel_event_desc *event_desc)
dffef45d 1160{
0def9170 1161 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
1bbb5b2d
MD		 1162 struct lttng_event_notifier_group *event_notifier_group = event_enabler->group;
1163 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
1164 uint64_t token = event_enabler->parent.user_token;
1165 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
a67ba386
MD		 1166 struct lttng_kernel_event_notifier *event_notifier;
1167 struct lttng_kernel_event_notifier_private *event_notifier_priv;
19bef247 1168 struct lttng_kernel_event_common_private *event_priv;
ab04d7b1 1169 struct lttng_counter *error_counter;
dffef45d
FD		 1170 const char *event_name;
1171 struct hlist_head *head;
1172 int ret;
1173
1174 switch (itype) {
606828e4 1175 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1176 event_name = event_desc->event_name;
b01155ba 1177 break;
b4a75708 1178
c190d76e
MJ		 1179 case LTTNG_KERNEL_ABI_KPROBE:
1180 lttng_fallthrough;
1181 case LTTNG_KERNEL_ABI_UPROBE:
1182 lttng_fallthrough;
606828e4 1183 case LTTNG_KERNEL_ABI_SYSCALL:
1bbb5b2d 1184 event_name = event_param->name;
2b16f0c9 1185 break;
b4a75708 1186
c190d76e
MJ		 1187 case LTTNG_KERNEL_ABI_KRETPROBE:
1188 lttng_fallthrough;
1189 case LTTNG_KERNEL_ABI_FUNCTION:
1190 lttng_fallthrough;
1191 case LTTNG_KERNEL_ABI_NOOP:
1192 lttng_fallthrough;
dffef45d
FD		 1193 default:
1194 WARN_ON_ONCE(1);
1195 ret = -EINVAL;
1196 goto type_error;
1197 }
1198
0def9170 1199 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247
MD		 1200 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
1201 event_notifier_priv = container_of(event_priv, struct lttng_kernel_event_notifier_private, parent);
1202
1203 WARN_ON_ONCE(!event_priv->desc);
1204 if (!strncmp(event_priv->desc->event_name, event_name,
606828e4 1205 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 1206 && event_notifier_group == event_notifier_priv->group
19bef247 1207 && token == event_priv->user_token) {
dffef45d
FD		 1208 ret = -EEXIST;
1209 goto exist;
1210 }
1211 }
1212
1213 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1214 if (!event_notifier) {
1215 ret = -ENOMEM;
1216 goto cache_error;
1217 }
a67ba386
MD		 1218 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1219 if (!event_notifier_priv) {
1220 ret = -ENOMEM;
1221 goto cache_private_error;
1222 }
1223 event_notifier_priv->pub = event_notifier;
1224 event_notifier_priv->parent.pub = &event_notifier->parent;
1225 event_notifier->priv = event_notifier_priv;
1226 event_notifier->parent.priv = &event_notifier_priv->parent;
1227 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1228
1229 event_notifier->priv->group = event_notifier_group;
1bbb5b2d
MD		 1230 event_notifier->priv->parent.user_token = event_enabler->parent.user_token;
1231 event_notifier->priv->error_counter_index = event_enabler->error_counter_index;
a67ba386
MD		 1232 event_notifier->priv->num_captures = 0;
1233 event_notifier->priv->parent.instrumentation = itype;
1234 event_notifier->notification_send = lttng_event_notifier_notification_send;
1235 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1236 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1237 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1238 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1239
1240 switch (itype) {
606828e4 1241 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1242 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1243 event_notifier->parent.enabled = 0;
1244 event_notifier->priv->parent.registered = 0;
1245 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1246 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1247 ret = -ENOENT;
1248 goto register_error;
1249 }
1250 /* Populate lttng_event_notifier structure before event registration. */
1251 smp_wmb();
1252 break;
b4a75708 1253
606828e4 1254 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1255 /*
1256 * Needs to be explicitly enabled after creation, since
1257 * we may want to apply filters.
1258 */
a67ba386
MD		 1259 event_notifier->parent.enabled = 0;
1260 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1261 /*
1262 * Populate lttng_event_notifier structure before event
1263 * registration.
1264 */
1265 smp_wmb();
1bbb5b2d
MD		 1266 ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name,
1267 event_param->u.kprobe.symbol_name,
1268 event_param->u.kprobe.offset,
1269 event_param->u.kprobe.addr,
6a35e5bd 1270 &event_notifier->parent);
2b16f0c9
FD		 1271 if (ret) {
1272 ret = -EINVAL;
1273 goto register_error;
1274 }
a67ba386 1275 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1276 WARN_ON_ONCE(!ret);
1277 break;
b4a75708 1278
606828e4 1279 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1280 /*
1281 * Needs to be explicitly enabled after creation, since
1282 * we may want to apply filters.
1283 */
a67ba386
MD		 1284 event_notifier->parent.enabled = 0;
1285 event_notifier->priv->parent.registered = 0;
1286 event_notifier->priv->parent.desc = event_desc;
1bbb5b2d 1287 switch (event_param->u.syscall.entryexit) {
606828e4 1288 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1289 ret = -EINVAL;
1290 goto register_error;
606828e4 1291 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1292 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1293 break;
606828e4 1294 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1295 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1296 break;
1297 }
1bbb5b2d 1298 switch (event_param->u.syscall.abi) {
606828e4 1299 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1300 ret = -EINVAL;
1301 goto register_error;
606828e4 1302 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1303 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1304 break;
606828e4 1305 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1306 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1307 break;
1308 }
1309
a67ba386 1310 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1311 ret = -EINVAL;
1312 goto register_error;
1313 }
1314 break;
b4a75708 1315
606828e4 1316 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1317 /*
1318 * Needs to be explicitly enabled after creation, since
1319 * we may want to apply filters.
1320 */
a67ba386
MD		 1321 event_notifier->parent.enabled = 0;
1322 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1323
1324 /*
1325 * Populate lttng_event_notifier structure before
1326 * event_notifier registration.
1327 */
1328 smp_wmb();
1329
1bbb5b2d
MD		 1330 ret = lttng_uprobes_register_event(event_param->name,
1331 event_param->u.uprobe.fd,
17806c46 1332 &event_notifier->parent);
9de67196
FD		 1333 if (ret)
1334 goto register_error;
a67ba386 1335 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1336 WARN_ON_ONCE(!ret);
1337 break;
b4a75708 1338
c190d76e
MJ		 1339 case LTTNG_KERNEL_ABI_KRETPROBE:
1340 lttng_fallthrough;
1341 case LTTNG_KERNEL_ABI_FUNCTION:
1342 lttng_fallthrough;
1343 case LTTNG_KERNEL_ABI_NOOP:
1344 lttng_fallthrough;
dffef45d
FD		 1345 default:
1346 WARN_ON_ONCE(1);
1347 ret = -EINVAL;
1348 goto register_error;
1349 }
1350
a67ba386 1351 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
19bef247 1352 hlist_add_head(&event_notifier->priv->parent.hlist_node, head);
99f52fcc
FD		 1353
1354 /*
1355 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1356 * bucket is currently in use. We trust it. The session lock
1357 * synchronizes against concurrent creation of the error
1358 * counter.
99f52fcc 1359 */
ab04d7b1
MD		 1360 error_counter = event_notifier_group->error_counter;
1361 if (error_counter) {
99f52fcc
FD		 1362 size_t dimension_index[1];
1363
1364 /*
1365 * Check that the index is within the boundary of the counter.
1366 */
a67ba386 1367 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1368 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1369 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1370 ret = -EINVAL;
1371 goto register_error;
1372 }
1373
a67ba386 1374 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1375 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1376 if (ret) {
1377 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1378 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1379 goto register_error;
1380 }
1381 }
1382
dffef45d
FD		 1383 return event_notifier;
1384
1385register_error:
a67ba386
MD		 1386 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1387cache_private_error:
dffef45d
FD		 1388 kmem_cache_free(event_notifier_cache, event_notifier);
1389cache_error:
1390exist:
1391type_error:
1392 return ERR_PTR(ret);
1393}
1394
83006ee0
MD		 1395struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1396 const struct lttng_kernel_event_desc *event_desc)
1397{
1398 switch (event_enabler->enabler_type) {
1399 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1400 {
1401 struct lttng_event_recorder_enabler *event_recorder_enabler =
1402 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1403 struct lttng_kernel_event_recorder *event_recorder;
1404
1405 event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc);
1406 if (!event_recorder)
1407 return NULL;
1408 return &event_recorder->parent;
1409 }
1410 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1411 {
1412 struct lttng_event_notifier_enabler *event_notifier_enabler =
1413 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1414 struct lttng_kernel_event_notifier *event_notifier;
1415
1416 event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc);
1417 if (!event_notifier)
1418 return NULL;
1419 return &event_notifier->parent;
1420 }
1421 default:
1422 return NULL;
1423 }
1424}
1425
1426struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1427 const struct lttng_kernel_event_desc *event_desc)
1428{
1429 struct lttng_kernel_event_common *event;
1430
1431 mutex_lock(&sessions_mutex);
1432 event = _lttng_kernel_event_create(event_enabler, event_desc);
1433 mutex_unlock(&sessions_mutex);
1434 return event;
1435}
1436
1437
1438
99f52fcc
FD		 1439int lttng_kernel_counter_read(struct lttng_counter *counter,
1440 const size_t *dim_indexes, int32_t cpu,
1441 int64_t *val, bool *overflow, bool *underflow)
1442{
1443 return counter->ops->counter_read(counter->counter, dim_indexes,
1444 cpu, val, overflow, underflow);
1445}
1446
1447int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1448 const size_t *dim_indexes, int64_t *val,
1449 bool *overflow, bool *underflow)
1450{
1451 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1452 val, overflow, underflow);
1453}
1454
1455int lttng_kernel_counter_clear(struct lttng_counter *counter,
1456 const size_t *dim_indexes)
1457{
1458 return counter->ops->counter_clear(counter->counter, dim_indexes);
1459}
1460
3c997079
MD		 1461/* Only used for tracepoints for now. */
1462static
0c851fa0 1463void register_event(struct lttng_kernel_event_common *event)
3c997079 1464{
437d5aa5 1465 const struct lttng_kernel_event_desc *desc;
f127e61e 1466 int ret = -EINVAL;
3c997079 1467
0c851fa0 1468 if (event->priv->registered)
3c997079 1469 return;
4ecb5ad5 1470
0c851fa0
MD		 1471 desc = event->priv->desc;
1472 switch (event->priv->instrumentation) {
606828e4 1473 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1474 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1475 desc->tp_class->probe_callback,
0c851fa0 1476 event);
4ecb5ad5 1477 break;
b4a75708 1478
606828e4 1479 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1480 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1481 break;
b4a75708 1482
c190d76e
MJ		 1483 case LTTNG_KERNEL_ABI_KPROBE:
1484 lttng_fallthrough;
1485 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1486 ret = 0;
f0bcc14c 1487 break;
0c851fa0
MD		 1488
1489 case LTTNG_KERNEL_ABI_KRETPROBE:
1490 switch (event->type) {
1491 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1492 ret = 0;
1493 break;
1494 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1495 WARN_ON_ONCE(1);
1496 break;
1497 }
4ecb5ad5 1498 break;
b4a75708 1499
c190d76e
MJ		 1500 case LTTNG_KERNEL_ABI_FUNCTION:
1501 lttng_fallthrough;
1502 case LTTNG_KERNEL_ABI_NOOP:
1503 lttng_fallthrough;
4ecb5ad5
MD		 1504 default:
1505 WARN_ON_ONCE(1);
1506 }
3c997079 1507 if (!ret)
0c851fa0 1508 event->priv->registered = 1;
3c997079
MD		 1509}
1510
f0bcc14c 1511int _lttng_event_unregister(struct lttng_kernel_event_common *event)
4e3c1b9b 1512{
f0bcc14c 1513 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1514 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1515 int ret = -EINVAL;
1516
a67ba386 1517 if (!event_priv->registered)
3c997079
MD		 1518 return 0;
1519
a67ba386
MD		 1520 desc = event_priv->desc;
1521 switch (event_priv->instrumentation) {
606828e4 1522 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1523 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1524 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1525 event);
baf20995 1526 break;
b4a75708 1527
606828e4 1528 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1529 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1530 ret = 0;
1531 break;
b4a75708 1532
606828e4 1533 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1534 switch (event->type) {
1535 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1536 lttng_kretprobes_unregister(event);
1537 ret = 0;
1538 break;
1539 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1540 WARN_ON_ONCE(1);
1541 break;
1542 }
7371f44c 1543 break;
b4a75708 1544
606828e4 1545 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1546 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1547 break;
b4a75708 1548
606828e4 1549 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1550 switch (event->type) {
1551 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1552 ret = 0;
1553 break;
1554 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1555 WARN_ON_ONCE(1);
1556 break;
1557 }
259b6cb3 1558 break;
b4a75708 1559
606828e4 1560 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1561 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1562 ret = 0;
1563 break;
b4a75708 1564
c190d76e
MJ		 1565 case LTTNG_KERNEL_ABI_FUNCTION:
1566 lttng_fallthrough;
baf20995
MD		 1567 default:
1568 WARN_ON_ONCE(1);
1569 }
3c997079 1570 if (!ret)
a67ba386 1571 event_priv->registered = 0;
dda6a249
MD		 1572 return ret;
1573}
1574
1575/*
1576 * Only used internally at session destruction.
1577 */
be066e6c 1578static
0648898e 1579void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1580{
0648898e 1581 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1582 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1583
0648898e
MD		 1584 lttng_free_event_filter_runtime(event);
1585 /* Free event enabler refs */
1586 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1587 &event_priv->enablers_ref_head, node)
1588 kfree(enabler_ref);
b4a75708 1589
0648898e
MD		 1590 switch (event->type) {
1591 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1592 {
1593 struct lttng_kernel_event_recorder *event_recorder =
1594 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1595
0648898e
MD		 1596 switch (event_priv->instrumentation) {
1597 case LTTNG_KERNEL_ABI_TRACEPOINT:
1598 lttng_event_desc_put(event_priv->desc);
1599 break;
b4a75708 1600
0648898e
MD		 1601 case LTTNG_KERNEL_ABI_KPROBE:
1602 module_put(event_priv->desc->owner);
6a35e5bd 1603 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1604 break;
b4a75708 1605
0648898e
MD		 1606 case LTTNG_KERNEL_ABI_KRETPROBE:
1607 module_put(event_priv->desc->owner);
eb6b47db 1608 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1609 break;
b4a75708 1610
0648898e
MD		 1611 case LTTNG_KERNEL_ABI_SYSCALL:
1612 break;
4e3c1b9b 1613
0648898e
MD		 1614 case LTTNG_KERNEL_ABI_UPROBE:
1615 module_put(event_priv->desc->owner);
17806c46 1616 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1617 break;
3ef5cc03 1618
c190d76e
MJ		 1619 case LTTNG_KERNEL_ABI_FUNCTION:
1620 lttng_fallthrough;
1621 case LTTNG_KERNEL_ABI_NOOP:
1622 lttng_fallthrough;
0648898e
MD		 1623 default:
1624 WARN_ON_ONCE(1);
1625 }
1626 list_del(&event_recorder->priv->node);
1627 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1628 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1629 break;
0648898e
MD		 1630 }
1631 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1632 {
1633 struct lttng_kernel_event_notifier *event_notifier =
1634 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1635
0648898e
MD		 1636 switch (event_notifier->priv->parent.instrumentation) {
1637 case LTTNG_KERNEL_ABI_TRACEPOINT:
1638 lttng_event_desc_put(event_notifier->priv->parent.desc);
1639 break;
b4a75708 1640
0648898e
MD		 1641 case LTTNG_KERNEL_ABI_KPROBE:
1642 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1643 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1644 break;
b4a75708 1645
0648898e
MD		 1646 case LTTNG_KERNEL_ABI_SYSCALL:
1647 break;
b4a75708 1648
0648898e
MD		 1649 case LTTNG_KERNEL_ABI_UPROBE:
1650 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1651 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1652 break;
1653
c190d76e
MJ		 1654 case LTTNG_KERNEL_ABI_KRETPROBE:
1655 lttng_fallthrough;
1656 case LTTNG_KERNEL_ABI_FUNCTION:
1657 lttng_fallthrough;
1658 case LTTNG_KERNEL_ABI_NOOP:
1659 lttng_fallthrough;
0648898e
MD		 1660 default:
1661 WARN_ON_ONCE(1);
1662 }
1663 list_del(&event_notifier->priv->node);
1664 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1665 kmem_cache_free(event_notifier_cache, event_notifier);
1666 break;
1667 }
dffef45d
FD		 1668 default:
1669 WARN_ON_ONCE(1);
1670 }
dffef45d
FD		 1671}
1672
8c0393c3 1673struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1674 enum tracker_type tracker_type)
e0130fab 1675{
d1f652f8
MD		 1676 switch (tracker_type) {
1677 case TRACKER_PID:
1678 return &session->pid_tracker;
1679 case TRACKER_VPID:
1680 return &session->vpid_tracker;
1681 case TRACKER_UID:
1682 return &session->uid_tracker;
1683 case TRACKER_VUID:
1684 return &session->vuid_tracker;
1685 case TRACKER_GID:
1686 return &session->gid_tracker;
1687 case TRACKER_VGID:
1688 return &session->vgid_tracker;
1689 default:
1690 WARN_ON_ONCE(1);
1691 return NULL;
1692 }
1693}
1694
8cdc1a81 1695int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1696 enum tracker_type tracker_type, int id)
1697{
8c0393c3 1698 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1699 int ret;
1700
d1f652f8
MD		 1701 tracker = get_tracker(session, tracker_type);
1702 if (!tracker)
1703 return -EINVAL;
1704 if (id < -1)
e0130fab
MD		 1705 return -EINVAL;
1706 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1707 if (id == -1) {
1708 /* track all ids: destroy tracker. */
1709 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1710 ret = 0;
1711 } else {
d1f652f8 1712 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1713 }
e0130fab
MD		 1714 mutex_unlock(&sessions_mutex);
1715 return ret;
1716}
1717
8cdc1a81 1718int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1719 enum tracker_type tracker_type, int id)
e0130fab 1720{
8c0393c3 1721 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1722 int ret;
1723
d1f652f8
MD		 1724 tracker = get_tracker(session, tracker_type);
1725 if (!tracker)
1726 return -EINVAL;
1727 if (id < -1)
e0130fab
MD		 1728 return -EINVAL;
1729 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1730 if (id == -1) {
1731 /* untrack all ids: replace by empty tracker. */
1732 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1733 } else {
d1f652f8 1734 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1735 }
e0130fab
MD		 1736 mutex_unlock(&sessions_mutex);
1737 return ret;
1738}
1739
7e6f9ef6 1740static
d1f652f8 1741void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1742{
8c0393c3
MD		 1743 struct lttng_kernel_id_tracker *id_tracker = m->private;
1744 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1745 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1746 int iter = 0, i;
1747
1748 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1749 if (id_tracker_p) {
1750 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1751 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1752
f934e302 1753 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1754 if (iter++ >= *pos)
1755 return e;
1756 }
1757 }
1758 } else {
d1f652f8 1759 /* ID tracker disabled. */
7e6f9ef6 1760 if (iter >= *pos && iter == 0) {
d1f652f8 1761 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1762 }
1763 iter++;
1764 }
1765 /* End of list */
1766 return NULL;
1767}
1768
1769/* Called with sessions_mutex held. */
1770static
d1f652f8 1771void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1772{
8c0393c3
MD		 1773 struct lttng_kernel_id_tracker *id_tracker = m->private;
1774 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1775 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1776 int iter = 0, i;
1777
1778 (*ppos)++;
d1f652f8
MD		 1779 if (id_tracker_p) {
1780 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1781 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1782
f934e302 1783 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1784 if (iter++ >= *ppos)
1785 return e;
1786 }
1787 }
1788 } else {
d1f652f8 1789 /* ID tracker disabled. */
7e6f9ef6 1790 if (iter >= *ppos && iter == 0)
d1f652f8 1791 return p; /* empty tracker */
7e6f9ef6
MD		 1792 iter++;
1793 }
1794
1795 /* End of list */
1796 return NULL;
1797}
1798
1799static
d1f652f8 1800void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1801{
1802 mutex_unlock(&sessions_mutex);
1803}
1804
1805static
d1f652f8 1806int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1807{
8c0393c3
MD		 1808 struct lttng_kernel_id_tracker *id_tracker = m->private;
1809 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1810 int id;
7e6f9ef6 1811
d1f652f8 1812 if (p == id_tracker_p) {
7e6f9ef6 1813 /* Tracker disabled. */
d1f652f8 1814 id = -1;
7e6f9ef6 1815 } else {
d1f652f8 1816 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1817
d1f652f8
MD		 1818 id = lttng_id_tracker_get_node_id(e);
1819 }
8c0393c3 1820 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1821 case TRACKER_PID:
1822 seq_printf(m, "process { pid = %d; };\n", id);
1823 break;
1824 case TRACKER_VPID:
1825 seq_printf(m, "process { vpid = %d; };\n", id);
1826 break;
1827 case TRACKER_UID:
1828 seq_printf(m, "user { uid = %d; };\n", id);
1829 break;
1830 case TRACKER_VUID:
1831 seq_printf(m, "user { vuid = %d; };\n", id);
1832 break;
1833 case TRACKER_GID:
1834 seq_printf(m, "group { gid = %d; };\n", id);
1835 break;
1836 case TRACKER_VGID:
1837 seq_printf(m, "group { vgid = %d; };\n", id);
1838 break;
1839 default:
1840 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1841 }
7e6f9ef6
MD		 1842 return 0;
1843}
1844
1845static
d1f652f8
MD		 1846const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1847 .start = id_list_start,
1848 .next = id_list_next,
1849 .stop = id_list_stop,
1850 .show = id_list_show,
7e6f9ef6
MD		 1851};
1852
1853static
d1f652f8 1854int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1855{
d1f652f8 1856 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1857}
1858
1859static
d1f652f8 1860int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1861{
1862 struct seq_file *m = file->private_data;
8c0393c3 1863 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1864 int ret;
1865
d1f652f8 1866 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1867 ret = seq_release(inode, file);
d1f652f8 1868 if (!ret)
8c0393c3 1869 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1870 return ret;
1871}
1872
d1f652f8 1873const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1874 .owner = THIS_MODULE,
d1f652f8 1875 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1876 .read = seq_read,
1877 .llseek = seq_lseek,
d1f652f8 1878 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1879};
1880
8cdc1a81 1881int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1882 enum tracker_type tracker_type)
7e6f9ef6 1883{
d1f652f8 1884 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1885 struct seq_file *m;
1886 int file_fd, ret;
1887
1888 file_fd = lttng_get_unused_fd();
1889 if (file_fd < 0) {
1890 ret = file_fd;
1891 goto fd_error;
1892 }
1893
d1f652f8
MD		 1894 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1895 &lttng_tracker_ids_list_fops,
7e6f9ef6 1896 NULL, O_RDWR);
d1f652f8
MD		 1897 if (IS_ERR(tracker_ids_list_file)) {
1898 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1899 goto file_error;
1900 }
8cdc1a81 1901 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1902 ret = -EOVERFLOW;
9c1f4643
MD		 1903 goto refcount_error;
1904 }
d1f652f8 1905 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1906 if (ret < 0)
1907 goto open_error;
d1f652f8
MD		 1908 m = tracker_ids_list_file->private_data;
1909
1910 m->private = get_tracker(session, tracker_type);
1911 BUG_ON(!m->private);
1912 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1913
1914 return file_fd;
1915
1916open_error:
8cdc1a81 1917 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1918refcount_error:
d1f652f8 1919 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1920file_error:
1921 put_unused_fd(file_fd);
1922fd_error:
1923 return ret;
1924}
1925
3c997079
MD		 1926/*
1927 * Enabler management.
1928 */
1929static
4993071a
PP		 1930int lttng_match_enabler_star_glob(const char *desc_name,
1931 const char *pattern)
3c997079 1932{
cbc19040
MD		 1933 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1934 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1935 return 0;
1936 return 1;
1937}
1938
1939static
4ecb5ad5
MD		 1940int lttng_match_enabler_name(const char *desc_name,
1941 const char *name)
3c997079 1942{
4ecb5ad5 1943 if (strcmp(desc_name, name))
3c997079
MD		 1944 return 0;
1945 return 1;
1946}
1947
437d5aa5 1948int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
8d554755 1949 struct lttng_event_enabler_common *enabler)
3c997079 1950{
4ecb5ad5 1951 const char *desc_name, *enabler_name;
badfe9f5 1952 bool compat = false, entry = false;
4ecb5ad5
MD		 1953
1954 enabler_name = enabler->event_param.name;
1955 switch (enabler->event_param.instrumentation) {
606828e4 1956 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1957 desc_name = desc->event_name;
3b861b22
FD		 1958 switch (enabler->format_type) {
1959 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1960 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1961 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1962 return lttng_match_enabler_name(desc_name, enabler_name);
1963 default:
1964 return -EINVAL;
1965 }
4ecb5ad5 1966 break;
b4a75708 1967
606828e4 1968 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1969 desc_name = desc->event_name;
badfe9f5 1970 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1971 desc_name += strlen("compat_");
badfe9f5
MD		 1972 compat = true;
1973 }
4ecb5ad5
MD		 1974 if (!strncmp(desc_name, "syscall_exit_",
1975 strlen("syscall_exit_"))) {
1976 desc_name += strlen("syscall_exit_");
1977 } else if (!strncmp(desc_name, "syscall_entry_",
1978 strlen("syscall_entry_"))) {
1979 desc_name += strlen("syscall_entry_");
badfe9f5 1980 entry = true;
4ecb5ad5
MD		 1981 } else {
1982 WARN_ON_ONCE(1);
1983 return -EINVAL;
1984 }
badfe9f5 1985 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1986 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1987 break;
606828e4 1988 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1989 if (!entry)
1990 return 0;
1991 break;
606828e4 1992 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1993 if (entry)
1994 return 0;
1995 break;
1996 default:
1997 return -EINVAL;
1998 }
1999 switch (enabler->event_param.u.syscall.abi) {
606828e4 2000 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2001 break;
606828e4 2002 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2003 if (compat)
2004 return 0;
2005 break;
606828e4 2006 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2007 if (!compat)
2008 return 0;
2009 break;
2010 default:
2011 return -EINVAL;
2012 }
2013 switch (enabler->event_param.u.syscall.match) {
606828e4 2014 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2015 switch (enabler->format_type) {
2016 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2017 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2018 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2019 return lttng_match_enabler_name(desc_name, enabler_name);
2020 default:
2021 return -EINVAL;
2022 }
2023 break;
606828e4 2024 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2025 return -EINVAL; /* Not implemented. */
2026 default:
2027 return -EINVAL;
2028 }
4ecb5ad5 2029 break;
b4a75708 2030
4ecb5ad5
MD		 2031 default:
2032 WARN_ON_ONCE(1);
2033 return -EINVAL;
2034 }
3c997079
MD		 2035}
2036
2037static
5c6ec66a
MD		 2038bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
2039 struct lttng_kernel_event_common *event)
3c997079 2040{
5c6ec66a
MD		 2041 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2042 return false;
b2bc0bc8 2043
5c6ec66a
MD		 2044 switch (event_enabler->enabler_type) {
2045 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2046 {
2047 struct lttng_event_recorder_enabler *event_recorder_enabler =
2048 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2049 struct lttng_kernel_event_recorder *event_recorder =
2050 container_of(event, struct lttng_kernel_event_recorder, parent);
2051
2052 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2053 && event_recorder->chan == event_recorder_enabler->chan)
2054 return true;
2055 else
2056 return false;
2057 }
2058 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2059 {
2060 struct lttng_event_notifier_enabler *event_notifier_enabler =
2061 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2062 struct lttng_kernel_event_notifier *event_notifier =
2063 container_of(event, struct lttng_kernel_event_notifier, parent);
2064
2065 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
2066 && event_notifier->priv->group == event_notifier_enabler->group
2067 && event->priv->user_token == event_enabler->user_token)
2068 return true;
2069 else
2070 return false;
2071 }
2072 default:
2073 WARN_ON_ONCE(1);
2074 return false;
2075 }
3c997079
MD		 2076}
2077
b01155ba 2078static
5c6ec66a
MD		 2079bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
2080 const struct lttng_kernel_event_desc *desc,
2081 struct lttng_kernel_event_common *event)
b01155ba 2082{
5c6ec66a
MD		 2083 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2084 return false;
b01155ba 2085
5c6ec66a
MD		 2086 switch (event_enabler->enabler_type) {
2087 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2088 {
2089 struct lttng_event_recorder_enabler *event_recorder_enabler =
2090 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2091 struct lttng_kernel_event_recorder *event_recorder =
2092 container_of(event, struct lttng_kernel_event_recorder, parent);
2093
2094 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
2095 return true;
2096 else
2097 return false;
2098 }
2099 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2100 {
2101 struct lttng_event_notifier_enabler *event_notifier_enabler =
2102 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2103 struct lttng_kernel_event_notifier *event_notifier =
2104 container_of(event, struct lttng_kernel_event_notifier, parent);
2105
2106 if (event->priv->desc == desc
2107 && event_notifier->priv->group == event_notifier_enabler->group
2108 && event->priv->user_token == event_enabler->user_token)
2109 return true;
2110 else
2111 return false;
2112 }
2113 default:
2114 WARN_ON_ONCE(1);
2115 return false;
2116 }
b01155ba
FD		 2117}
2118
3c997079 2119static
b2bc0bc8
FD		 2120struct lttng_enabler_ref *lttng_enabler_ref(
2121 struct list_head *enablers_ref_list,
8d554755 2122 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2123{
2124 struct lttng_enabler_ref *enabler_ref;
2125
b2bc0bc8 2126 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2127 if (enabler_ref->ref == enabler)
2128 return enabler_ref;
2129 }
2130 return NULL;
2131}
2132
3c997079 2133static
1ae083ba 2134void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2135{
0def9170 2136 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent);
437d5aa5
MD		 2137 struct lttng_kernel_probe_desc *probe_desc;
2138 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2139 int i;
2140 struct list_head *probe_list;
2141
2142 probe_list = lttng_get_probe_list_head();
2143 /*
2144 * For each probe event, if we find that a probe event matches
2145 * our enabler, create an associated lttng_event if not
2146 * already present.
2147 */
2148 list_for_each_entry(probe_desc, probe_list, head) {
2149 for (i = 0; i < probe_desc->nr_events; i++) {
2150 int found = 0;
2151 struct hlist_head *head;
83006ee0 2152 struct lttng_kernel_event_common *event;
19bef247 2153 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2154
2155 desc = probe_desc->event_desc[i];
b2bc0bc8 2156 if (!lttng_desc_match_enabler(desc,
1ae083ba 2157 lttng_event_recorder_enabler_as_enabler(event_enabler)))
3c997079 2158 continue;
3c997079
MD		 2159
2160 /*
2161 * Check if already created.
2162 */
0def9170 2163 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2164 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
5c6ec66a 2165 if (lttng_event_enabler_desc_match_event(&event_enabler->parent, desc, event_priv->pub))
3c997079
MD		 2166 found = 1;
2167 }
2168 if (found)
2169 continue;
2170
2171 /*
83006ee0 2172 * We need to create an event for this event probe.
3c997079 2173 */
83006ee0
MD		 2174 event = _lttng_kernel_event_create(&event_enabler->parent, desc);
2175 if (!event) {
5a15f70c 2176 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2177 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2178 }
2179 }
2180 }
2181}
2182
b01155ba
FD		 2183static
2184void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2185{
0def9170 2186 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent);
437d5aa5
MD		 2187 struct lttng_kernel_probe_desc *probe_desc;
2188 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2189 int i;
2190 struct list_head *probe_list;
2191
2192 probe_list = lttng_get_probe_list_head();
2193 /*
2194 * For each probe event, if we find that a probe event matches
2195 * our enabler, create an associated lttng_event_notifier if not
2196 * already present.
2197 */
2198 list_for_each_entry(probe_desc, probe_list, head) {
2199 for (i = 0; i < probe_desc->nr_events; i++) {
2200 int found = 0;
2201 struct hlist_head *head;
83006ee0 2202 struct lttng_kernel_event_common *event;
19bef247 2203 struct lttng_kernel_event_common_private *event_priv;
b01155ba
FD		 2204
2205 desc = probe_desc->event_desc[i];
2206 if (!lttng_desc_match_enabler(desc,
2207 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2208 continue;
2209
2210 /*
2211 * Check if already created.
2212 */
0def9170 2213 head = utils_borrow_hash_table_bucket(events_ht->table,
33af697f 2214 LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2215 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
5c6ec66a 2216 if (lttng_event_enabler_desc_match_event(&event_notifier_enabler->parent, desc, event_priv->pub))
b01155ba
FD		 2217 found = 1;
2218 }
2219 if (found)
2220 continue;
2221
2222 /*
2223 * We need to create a event_notifier for this event probe.
2224 */
83006ee0
MD		 2225 event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc);
2226 if (IS_ERR(event)) {
b01155ba 2227 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2228 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2229 }
2230 }
2231 }
2232}
2233
33a39a3c 2234static
053554ae 2235void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c
MD		 2236{
2237 int ret;
2238
053554ae 2239 ret = lttng_syscalls_register_event(event_enabler);
8a8ac9a8 2240 WARN_ON_ONCE(ret);
8a8ac9a8
FD		 2241}
2242
33a39a3c 2243/*
a67ba386 2244 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2245 * tracepoint probes.
2246 * Should be called with sessions mutex held.
2247 */
2248static
1ae083ba 2249void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
33a39a3c 2250{
5b9817ae 2251 switch (event_enabler->parent.event_param.instrumentation) {
606828e4 2252 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2253 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2254 break;
b4a75708 2255
606828e4 2256 case LTTNG_KERNEL_ABI_SYSCALL:
053554ae 2257 lttng_create_syscall_event_if_missing(&event_enabler->parent);
33a39a3c 2258 break;
b4a75708 2259
33a39a3c
MD		 2260 default:
2261 WARN_ON_ONCE(1);
2262 break;
2263 }
2264}
2265
3c997079 2266/*
b2bc0bc8 2267 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2268 * and add backward reference from the event to the enabler.
2269 * Should be called with sessions mutex held.
2270 */
2271static
1ae083ba 2272int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2273{
f7d06400
MD		 2274 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2275 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
1ae083ba 2276 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
a67ba386 2277 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2278
606828e4
MD		 2279 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2280 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2281 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2282 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2283 int enabled = base_enabler->enabled;
606828e4 2284 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2285
606828e4 2286 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2287 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
3b82c4e1 2288
606828e4 2289 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2290 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
badfe9f5
MD		 2291 }
2292
3c997079 2293 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2294 lttng_create_event_if_missing(event_enabler);
3c997079 2295
b2bc0bc8 2296 /* For each event matching event_enabler in session event list. */
8cdc1a81 2297 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2298 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2299 struct lttng_enabler_ref *enabler_ref;
2300
5c6ec66a 2301 if (!lttng_event_enabler_match_event(&event_enabler->parent, &event_recorder->parent))
3c997079 2302 continue;
a67ba386 2303 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
1ae083ba 2304 lttng_event_recorder_enabler_as_enabler(event_enabler));
3c997079
MD		 2305 if (!enabler_ref) {
2306 /*
2307 * If no backward ref, create it.
b2bc0bc8 2308 * Add backward ref from event to event_enabler.
3c997079
MD		 2309 */
2310 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2311 if (!enabler_ref)
2312 return -ENOMEM;
1ae083ba 2313 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
3c997079 2314 list_add(&enabler_ref->node,
a67ba386 2315 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2316 }
2317
f127e61e
MD		 2318 /*
2319 * Link filter bytecodes if not linked yet.
2320 */
a67ba386 2321 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2322 lttng_static_ctx,
a67ba386 2323 &event_recorder_priv->parent.filter_bytecode_runtime_head,
1ae083ba 2324 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2325 }
2326 return 0;
2327}
2328
b01155ba 2329/*
a67ba386 2330 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2331 * tracepoint probes.
2332 * Should be called with sessions mutex held.
2333 */
2334static
2335void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2336{
5b9817ae 2337 switch (event_notifier_enabler->parent.event_param.instrumentation) {
606828e4 2338 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2339 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2340 break;
b4a75708 2341
606828e4 2342 case LTTNG_KERNEL_ABI_SYSCALL:
053554ae 2343 lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent);
8a8ac9a8 2344 break;
b4a75708 2345
b01155ba
FD		 2346 default:
2347 WARN_ON_ONCE(1);
2348 break;
2349 }
2350}
2351
2352/*
2353 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2354 */
2355static
8a8ac9a8
FD		 2356int lttng_event_notifier_enabler_ref_event_notifiers(
2357 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2358{
2359 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8d554755 2360 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2361 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2362
606828e4
MD		 2363 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2364 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2365 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2366 !strcmp(base_enabler->event_param.name, "*")) {
2367
2368 int enabled = base_enabler->enabled;
606828e4 2369 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2370
606828e4 2371 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2372 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
8a8ac9a8 2373
606828e4 2374 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2375 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
8a8ac9a8
FD		 2376
2377 }
2378
b01155ba
FD		 2379 /* First ensure that probe event_notifiers are created for this enabler. */
2380 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2381
2382 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2383 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2384 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2385 struct lttng_enabler_ref *enabler_ref;
2386
5c6ec66a 2387 if (!lttng_event_enabler_match_event(&event_notifier_enabler->parent, &event_notifier->parent))
b01155ba
FD		 2388 continue;
2389
a67ba386 2390 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2391 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2392 if (!enabler_ref) {
2393 /*
2394 * If no backward ref, create it.
2395 * Add backward ref from event_notifier to enabler.
2396 */
2397 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2398 if (!enabler_ref)
2399 return -ENOMEM;
2400
2401 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2402 event_notifier_enabler);
2403 list_add(&enabler_ref->node,
a67ba386 2404 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2405 }
2406
2407 /*
2408 * Link filter bytecodes if not linked yet.
2409 */
a67ba386
MD		 2410 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2411 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2412 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2413
2414 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2415 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2416 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2417 &event_notifier_enabler->capture_bytecode_head);
2418
a67ba386 2419 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2420 }
2421 return 0;
2422}
2423
3c997079
MD		 2424/*
2425 * Called at module load: connect the probe on all enablers matching
2426 * this event.
2427 * Called with sessions lock held.
2428 */
2429int lttng_fix_pending_events(void)
2430{
8cdc1a81 2431 struct lttng_kernel_session_private *session_priv;
3c997079 2432
8cdc1a81
MD		 2433 list_for_each_entry(session_priv, &sessions, list)
2434 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2435 return 0;
2436}
2437
b01155ba
FD		 2438static bool lttng_event_notifier_group_has_active_event_notifiers(
2439 struct lttng_event_notifier_group *event_notifier_group)
2440{
2441 struct lttng_event_notifier_enabler *event_notifier_enabler;
2442
2443 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2444 node) {
5b9817ae 2445 if (event_notifier_enabler->parent.enabled)
b01155ba
FD		 2446 return true;
2447 }
2448 return false;
2449}
2450
2451bool lttng_event_notifier_active(void)
2452{
2453 struct lttng_event_notifier_group *event_notifier_group;
2454
2455 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2456 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2457 return true;
2458 }
2459 return false;
2460}
2461
2462int lttng_fix_pending_event_notifiers(void)
2463{
2464 struct lttng_event_notifier_group *event_notifier_group;
2465
2466 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2467 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2468 return 0;
2469}
2470
1ae083ba 2471struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2472 enum lttng_enabler_format_type format_type,
606828e4 2473 struct lttng_kernel_abi_event *event_param,
f7d06400 2474 struct lttng_kernel_channel_buffer *chan)
3c997079 2475{
1ae083ba 2476 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2477
b2bc0bc8
FD		 2478 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2479 if (!event_enabler)
3c997079 2480 return NULL;
0bb716a8 2481 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2482 event_enabler->parent.format_type = format_type;
2483 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2484 memcpy(&event_enabler->parent.event_param, event_param,
2485 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2486 event_enabler->chan = chan;
3c997079 2487 /* ctx left NULL */
5b9817ae 2488 event_enabler->parent.enabled = 0;
def1e304
MD		 2489 return event_enabler;
2490}
2491
2492void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2493 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2494{
3c997079 2495 mutex_lock(&sessions_mutex);
def1e304
MD		 2496 list_add(&event_enabler->node, &session->priv->enablers_head);
2497 event_enabler->published = true;
2498 lttng_session_lazy_sync_event_enablers(session);
3c997079 2499 mutex_unlock(&sessions_mutex);
3c997079
MD		 2500}
2501
7b25ab0e 2502int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2503{
2504 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2505 event_enabler->enabled = 1;
2506 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2507 mutex_unlock(&sessions_mutex);
2508 return 0;
2509}
2510
7b25ab0e 2511int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2512{
2513 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2514 event_enabler->enabled = 0;
2515 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2516 mutex_unlock(&sessions_mutex);
2517 return 0;
2518}
2519
b2bc0bc8 2520static
8d554755 2521int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2522 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2523{
d64ca521 2524 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2525 uint32_t bytecode_len;
2526 int ret;
2527
2528 ret = get_user(bytecode_len, &bytecode->len);
2529 if (ret)
2530 return ret;
52cfcdf3 2531 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2532 GFP_KERNEL);
2533 if (!bytecode_node)
2534 return -ENOMEM;
2535 ret = copy_from_user(&bytecode_node->bc, bytecode,
2536 sizeof(*bytecode) + bytecode_len);
2537 if (ret)
2538 goto error_free;
b2bc0bc8 2539
8a445457 2540 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2541 bytecode_node->enabler = enabler;
2542 /* Enforce length based on allocated size */
2543 bytecode_node->bc.len = bytecode_len;
2544 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2545
07dfc1d0
MD		 2546 return 0;
2547
2548error_free:
52cfcdf3 2549 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2550 return ret;
2551}
2552
6048044f 2553int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2554 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2555{
2556 int ret;
6048044f 2557 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2558 if (ret)
2559 goto error;
7b25ab0e 2560 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2561 return 0;
2562
2563error:
2564 return ret;
2565}
2566
e2d5dbc7 2567int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2568 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2569{
2570
e2d5dbc7 2571 switch (event->priv->instrumentation) {
606828e4 2572 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2573 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2574 default:
2575 return -EINVAL;
2576 }
2577}
2578
3c997079 2579static
8d554755 2580void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2581{
d64ca521 2582 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2583
2584 /* Destroy filter bytecode */
2585 list_for_each_entry_safe(filter_node, tmp_filter_node,
2586 &enabler->filter_bytecode_head, node) {
52cfcdf3 2587 lttng_kvfree(filter_node);
07dfc1d0 2588 }
b2bc0bc8
FD		 2589}
2590
44b1abdc 2591void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2592{
44b1abdc
MD		 2593 switch (event_enabler->enabler_type) {
2594 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2595 {
2596 struct lttng_event_recorder_enabler *event_recorder_enabler =
2597 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2598
2599 lttng_enabler_destroy(event_enabler);
2600 if (event_recorder_enabler->published)
2601 list_del(&event_recorder_enabler->node);
2602 kfree(event_recorder_enabler);
2603 break;
2604 }
2605 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2606 {
2607 struct lttng_event_notifier_enabler *event_notifier_enabler =
2608 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2609
44b1abdc 2610 lttng_enabler_destroy(event_enabler);
1bbb5b2d
MD		 2611 if (event_notifier_enabler->published)
2612 list_del(&event_notifier_enabler->node);
44b1abdc
MD		 2613 kfree(event_notifier_enabler);
2614 break;
2615 }
2616 default:
2617 WARN_ON_ONCE(1);
2618 }
3c997079
MD		 2619}
2620
dffef45d 2621struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2622 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2623 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2624 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2625{
2626 struct lttng_event_notifier_enabler *event_notifier_enabler;
2627
2628 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2629 if (!event_notifier_enabler)
2630 return NULL;
2631
0bb716a8 2632 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2633 event_notifier_enabler->parent.format_type = format_type;
2634 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2635 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2636
99f52fcc 2637 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2638 event_notifier_enabler->num_captures = 0;
dffef45d 2639
5b9817ae
MD		 2640 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2641 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2642
5b9817ae
MD		 2643 event_notifier_enabler->parent.enabled = 0;
2644 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2645 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2646 return event_notifier_enabler;
2647}
dffef45d 2648
1bbb5b2d
MD		 2649void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2650 struct lttng_event_notifier_enabler *event_notifier_enabler)
2651{
dffef45d
FD		 2652 mutex_lock(&sessions_mutex);
2653 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
1bbb5b2d 2654 event_notifier_enabler->published = true;
b01155ba 2655 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2656 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2657}
2658
2659int lttng_event_notifier_enabler_enable(
2660 struct lttng_event_notifier_enabler *event_notifier_enabler)
2661{
2662 mutex_lock(&sessions_mutex);
2663 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2664 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2665 mutex_unlock(&sessions_mutex);
2666 return 0;
2667}
2668
2669int lttng_event_notifier_enabler_disable(
2670 struct lttng_event_notifier_enabler *event_notifier_enabler)
2671{
2672 mutex_lock(&sessions_mutex);
2673 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2674 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2675 mutex_unlock(&sessions_mutex);
2676 return 0;
2677}
2678
99d223ad
FD		 2679int lttng_event_notifier_enabler_attach_capture_bytecode(
2680 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2681 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2682{
d64ca521 2683 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2684 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2685 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2686 uint32_t bytecode_len;
2687 int ret;
2688
2689 ret = get_user(bytecode_len, &bytecode->len);
2690 if (ret)
2691 return ret;
2692
2693 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2694 GFP_KERNEL);
2695 if (!bytecode_node)
2696 return -ENOMEM;
2697
2698 ret = copy_from_user(&bytecode_node->bc, bytecode,
2699 sizeof(*bytecode) + bytecode_len);
2700 if (ret)
2701 goto error_free;
2702
8a445457 2703 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2704 bytecode_node->enabler = enabler;
2705
2706 /* Enforce length based on allocated size */
2707 bytecode_node->bc.len = bytecode_len;
2708 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2709
2710 event_notifier_enabler->num_captures++;
2711
2712 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2713 goto end;
2714
2715error_free:
2716 lttng_kvfree(bytecode_node);
2717end:
2718 return ret;
2719}
2720
3c997079 2721/*
b2bc0bc8 2722 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2723 * session.
2724 * Should be called with sessions mutex held.
2725 */
2726static
8cdc1a81 2727void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2728{
1ae083ba 2729 struct lttng_event_recorder_enabler *event_enabler;
a67ba386 2730 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2731
8cdc1a81 2732 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2733 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2734 /*
2735 * For each event, if at least one of its enablers is enabled,
2736 * and its channel and session transient states are enabled, we
2737 * enable the event, else we disable it.
2738 */
8cdc1a81 2739 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2740 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2741 struct lttng_enabler_ref *enabler_ref;
218585b9 2742 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2743 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2744 int nr_filters = 0;
3c997079 2745
a67ba386 2746 switch (event_recorder_priv->parent.instrumentation) {
c190d76e
MJ		 2747 case LTTNG_KERNEL_ABI_TRACEPOINT:
2748 lttng_fallthrough;
606828e4 2749 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2750 /* Enable events */
2751 list_for_each_entry(enabler_ref,
a67ba386 2752 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2753 if (enabler_ref->ref->enabled) {
2754 enabled = 1;
2755 break;
2756 }
2757 }
4ecb5ad5 2758 break;
b4a75708 2759
4ecb5ad5 2760 default:
3c997079
MD		 2761 /* Not handled with lazy sync. */
2762 continue;
2763 }
2764 /*
2765 * Enabled state is based on union of enablers, with
2766 * intesection of session and channel transient enable
2767 * states.
2768 */
f7d06400 2769 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2770
a67ba386 2771 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2772 /*
2773 * Sync tracepoint registration with event enabled
2774 * state.
2775 */
2776 if (enabled) {
0c851fa0 2777 register_event(&event_recorder->parent);
3c997079 2778 } else {
f0bcc14c 2779 _lttng_event_unregister(&event_recorder->parent);
3c997079 2780 }
07dfc1d0
MD		 2781
2782 /* Check if has enablers without bytecode enabled */
2783 list_for_each_entry(enabler_ref,
a67ba386 2784 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2785 if (enabler_ref->ref->enabled
2786 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2787 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2788 break;
2789 }
2790 }
a67ba386 2791 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2792 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2793
2794 /* Enable filters */
2795 list_for_each_entry(runtime,
e2d5dbc7 2796 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2797 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2798 nr_filters++;
2799 }
2800 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2801 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2802 }
2803}
2804
2805/*
2806 * Apply enablers to session events, adding events to session if need
2807 * be. It is required after each modification applied to an active
2808 * session, and right before session "start".
2809 * "lazy" sync means we only sync if required.
2810 * Should be called with sessions mutex held.
2811 */
2812static
8cdc1a81 2813void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2814{
2815 /* We can skip if session is not active */
2816 if (!session->active)
2817 return;
b2bc0bc8 2818 lttng_session_sync_event_enablers(session);
3c997079
MD		 2819}
2820
b01155ba
FD		 2821static
2822void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2823{
2824 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2825 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2826
2827 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2828 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2829
2830 /*
2831 * For each event_notifier, if at least one of its enablers is enabled,
2832 * we enable the event_notifier, else we disable it.
2833 */
a67ba386
MD		 2834 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2835 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2836 struct lttng_enabler_ref *enabler_ref;
218585b9 2837 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2838 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2839 int nr_filters = 0, nr_captures = 0;
b01155ba 2840
a67ba386 2841 switch (event_notifier_priv->parent.instrumentation) {
c190d76e
MJ		 2842 case LTTNG_KERNEL_ABI_TRACEPOINT:
2843 lttng_fallthrough;
606828e4 2844 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2845 /* Enable event_notifiers */
2846 list_for_each_entry(enabler_ref,
a67ba386 2847 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2848 if (enabler_ref->ref->enabled) {
2849 enabled = 1;
2850 break;
2851 }
2852 }
2853 break;
b4a75708 2854
b01155ba
FD		 2855 default:
2856 /* Not handled with sync. */
2857 continue;
2858 }
2859
a67ba386 2860 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2861 /*
2862 * Sync tracepoint registration with event_notifier enabled
2863 * state.
2864 */
2865 if (enabled) {
a67ba386 2866 if (!event_notifier_priv->parent.registered)
0c851fa0 2867 register_event(&event_notifier->parent);
b01155ba 2868 } else {
a67ba386 2869 if (event_notifier_priv->parent.registered)
f0bcc14c 2870 _lttng_event_unregister(&event_notifier->parent);
b01155ba
FD		 2871 }
2872
2873 /* Check if has enablers without bytecode enabled */
2874 list_for_each_entry(enabler_ref,
a67ba386 2875 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2876 if (enabler_ref->ref->enabled
2877 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2878 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2879 break;
2880 }
2881 }
a67ba386 2882 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2883 has_enablers_without_filter_bytecode;
b01155ba
FD		 2884
2885 /* Enable filters */
2886 list_for_each_entry(runtime,
e2d5dbc7 2887 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2888 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2889 nr_filters++;
2890 }
2891 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2892 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2893
2894 /* Enable captures */
2895 list_for_each_entry(runtime,
e2d5dbc7 2896 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2897 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2898 nr_captures++;
2899 }
2900 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2901 }
2902}
2903
7b25ab0e
MD		 2904static
2905void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2906{
2907 switch (event_enabler->enabler_type) {
2908 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2909 {
2910 struct lttng_event_recorder_enabler *event_recorder_enabler =
2911 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2912 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2913 break;
2914 }
2915 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2916 {
2917 struct lttng_event_notifier_enabler *event_notifier_enabler =
2918 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2919 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2920 break;
2921 }
2922 default:
2923 WARN_ON_ONCE(1);
2924 }
2925}
2926
1ec3f75a 2927/*
d83004aa
JD		 2928 * Serialize at most one packet worth of metadata into a metadata
2929 * channel.
92d9f5e6
MD		 2930 * We grab the metadata cache mutex to get exclusive access to our metadata
2931 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2932 * allows us to do racy operations such as looking for remaining space left in
2933 * packet and write, since mutual exclusion protects us from concurrent writes.
2934 * Mutual exclusion on the metadata cache allow us to read the cache content
2935 * without racing against reallocation of the cache by updates.
35097f36
JD		 2936 * Returns the number of bytes written in the channel, 0 if no data
2937 * was written and a negative value on error.
1ec3f75a 2938 */
b3b8072b 2939int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2940 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2941{
8a57ec02 2942 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2943 int ret = 0;
2944 size_t len, reserve_len;
2945
f613e3e6 2946 /*
92d9f5e6
MD		 2947 * Ensure we support mutiple get_next / put sequences followed by
2948 * put_next. The metadata cache lock protects reading the metadata
2949 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2950 * "flush" operations on the buffer invoked by different processes.
2951 * Moreover, since the metadata cache memory can be reallocated, we
2952 * need to have exclusive access against updates even though we only
2953 * read it.
f613e3e6 2954 */
92d9f5e6 2955 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2956 WARN_ON(stream->metadata_in < stream->metadata_out);
2957 if (stream->metadata_in != stream->metadata_out)
de23d59d 2958 goto end;
f613e3e6 2959
9616f0bf
JD		 2960 /* Metadata regenerated, change the version. */
2961 if (stream->metadata_cache->version != stream->version)
2962 stream->version = stream->metadata_cache->version;
2963
d83004aa 2964 len = stream->metadata_cache->metadata_written -
f613e3e6 2965 stream->metadata_in;
9de2c215 2966 if (!len)
de23d59d 2967 goto end;
d83004aa 2968 reserve_len = min_t(size_t,
4a399b76 2969 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2970 len);
a775608d 2971 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2972 sizeof(char), NULL);
d83004aa
JD		 2973 /*
2974 * If reservation failed, return an error to the caller.
2975 */
c2fb9c1c 2976 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2977 if (ret != 0) {
2978 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2979 stream->coherent = false;
d83004aa
JD		 2980 goto end;
2981 }
b3b8072b 2982 stream->transport->ops.event_write(&ctx,
f613e3e6 2983 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2984 reserve_len, 1);
b3b8072b 2985 stream->transport->ops.event_commit(&ctx);
f613e3e6 2986 stream->metadata_in += reserve_len;
3e75e2a7 2987 if (reserve_len < len)
8b97fd42
MD		 2988 stream->coherent = false;
2989 else
2990 stream->coherent = true;
d83004aa
JD		 2991 ret = reserve_len;
2992
2993end:
8b97fd42
MD		 2994 if (coherent)
2995 *coherent = stream->coherent;
92d9f5e6 2996 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2997 return ret;
2998}
2999
8b97fd42 3000static
8cdc1a81 3001void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 3002{
8cdc1a81
MD		 3003 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
3004 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 3005}
3006
3007static
8cdc1a81 3008void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 3009{
8cdc1a81
MD		 3010 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3011 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 3012 struct lttng_metadata_stream *stream;
3013
8cdc1a81 3014 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 3015 wake_up_interruptible(&stream->read_wait);
8cdc1a81 3016 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 3017 }
8b97fd42
MD		 3018}
3019
d83004aa
JD		 3020/*
3021 * Write the metadata to the metadata cache.
3022 * Must be called with sessions_mutex held.
92d9f5e6
MD		 3023 * The metadata cache lock protects us from concurrent read access from
3024 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 3025 * The content of the printf is printed as a single atomic metadata
3026 * transaction.
d83004aa 3027 */
8cdc1a81 3028int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 3029 const char *fmt, ...)
3030{
c099397a 3031 char *str;
d83004aa 3032 size_t len;
c099397a
MD		 3033 va_list ap;
3034
585e5dcc 3035 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 3036
3037 va_start(ap, fmt);
3038 str = kvasprintf(GFP_KERNEL, fmt, ap);
3039 va_end(ap);
3040 if (!str)
3041 return -ENOMEM;
3042
1ec3f75a 3043 len = strlen(str);
8cdc1a81
MD		 3044 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3045 if (session->priv->metadata_cache->metadata_written + len >
3046 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 3047 char *tmp_cache_realloc;
3048 unsigned int tmp_cache_alloc_size;
3049
3050 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 3051 session->priv->metadata_cache->cache_alloc + len,
3052 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 3053 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 3054 if (!tmp_cache_realloc)
3055 goto err;
8cdc1a81 3056 if (session->priv->metadata_cache->data) {
a606b6e8 3057 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 3058 session->priv->metadata_cache->data,
3059 session->priv->metadata_cache->cache_alloc);
3060 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 3061 }
3062
8cdc1a81
MD		 3063 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3064 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3065 }
8cdc1a81
MD		 3066 memcpy(session->priv->metadata_cache->data +
3067 session->priv->metadata_cache->metadata_written,
d83004aa 3068 str, len);
8cdc1a81 3069 session->priv->metadata_cache->metadata_written += len;
c099397a 3070 kfree(str);
d83004aa 3071
d83004aa
JD		 3072 return 0;
3073
3074err:
3075 kfree(str);
3076 return -ENOMEM;
c099397a
MD		 3077}
3078
f513b2bf 3079static
8cdc1a81 3080int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3081{
3082 size_t i;
3083
3084 for (i = 0; i < nesting; i++) {
3085 int ret;
3086
3087 ret = lttng_metadata_printf(session, " ");
3088 if (ret) {
3089 return ret;
3090 }
3091 }
3092 return 0;
3093}
3094
ceabb767 3095static
8cdc1a81 3096int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3097 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3098 size_t nesting)
3099{
3100 return lttng_metadata_printf(session, " _%s;\n", field->name);
3101}
3102
3103static
8cdc1a81 3104int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3105 const struct lttng_kernel_type_integer *type,
3106 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3107 size_t nesting)
3108{
3109 int ret;
3110
ceabb767
MD		 3111 ret = print_tabs(session, nesting);
3112 if (ret)
3113 return ret;
3114 ret = lttng_metadata_printf(session,
3115 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3116 type->size,
3117 type->alignment,
3118 type->signedness,
3119 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3120 ? "none"
437d5aa5 3121 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3122 ? "UTF8"
3123 : "ASCII",
437d5aa5 3124 type->base,
ceabb767 3125#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3126 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3127#else
437d5aa5 3128 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3129#endif
3130 );
3131 return ret;
3132}
3133
f513b2bf
MD		 3134/*
3135 * Must be called with sessions_mutex held.
3136 */
3137static
8cdc1a81 3138int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3139 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3140 size_t nesting)
3141{
51ef4536 3142 const char *prev_field_name = NULL;
f513b2bf
MD		 3143 int ret;
3144 uint32_t i, nr_fields;
ceabb767
MD		 3145 unsigned int alignment;
3146
f513b2bf
MD		 3147 ret = print_tabs(session, nesting);
3148 if (ret)
3149 return ret;
3150 ret = lttng_metadata_printf(session,
3151 "struct {\n");
3152 if (ret)
3153 return ret;
437d5aa5 3154 nr_fields = type->nr_fields;
f513b2bf 3155 for (i = 0; i < nr_fields; i++) {
437d5aa5 3156 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3157
437d5aa5 3158 iter_field = type->fields[i];
51ef4536 3159 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3160 if (ret)
3161 return ret;
3162 }
3163 ret = print_tabs(session, nesting);
3164 if (ret)
3165 return ret;
437d5aa5 3166 alignment = type->alignment;
ceabb767
MD		 3167 if (alignment) {
3168 ret = lttng_metadata_printf(session,
3169 "} align(%u)",
3170 alignment);
3171 } else {
3172 ret = lttng_metadata_printf(session,
3173 "}");
3174 }
f513b2bf
MD		 3175 return ret;
3176}
3177
3178/*
3179 * Must be called with sessions_mutex held.
3180 */
3181static
8cdc1a81 3182int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3183 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3184 size_t nesting)
3185{
3186 int ret;
3187
3188 ret = _lttng_struct_type_statedump(session,
437d5aa5 3189 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3190 if (ret)
3191 return ret;
ceabb767 3192 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3193}
3194
65c85aa6
MD		 3195/*
3196 * Must be called with sessions_mutex held.
3197 */
3198static
8cdc1a81 3199int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3200 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3201 size_t nesting,
3202 const char *prev_field_name)
65c85aa6 3203{
51ef4536 3204 const char *tag_name;
65c85aa6
MD		 3205 int ret;
3206 uint32_t i, nr_choices;
3207
51ef4536
MD		 3208 tag_name = type->tag_name;
3209 if (!tag_name)
3210 tag_name = prev_field_name;
3211 if (!tag_name)
3212 return -EINVAL;
ceabb767
MD		 3213 /*
3214 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3215 */
437d5aa5 3216 if (type->alignment != 0)
ceabb767 3217 return -EINVAL;
65c85aa6
MD		 3218 ret = print_tabs(session, nesting);
3219 if (ret)
3220 return ret;
3221 ret = lttng_metadata_printf(session,
3222 "variant <_%s> {\n",
51ef4536 3223 tag_name);
65c85aa6
MD		 3224 if (ret)
3225 return ret;
437d5aa5 3226 nr_choices = type->nr_choices;
65c85aa6 3227 for (i = 0; i < nr_choices; i++) {
437d5aa5 3228 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3229
437d5aa5 3230 iter_field = type->choices[i];
51ef4536 3231 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3232 if (ret)
3233 return ret;
3234 }
3235 ret = print_tabs(session, nesting);
3236 if (ret)
3237 return ret;
3238 ret = lttng_metadata_printf(session,
3239 "}");
3240 return ret;
3241}
3242
3243/*
3244 * Must be called with sessions_mutex held.
3245 */
3246static
8cdc1a81 3247int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3248 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3249 size_t nesting,
3250 const char *prev_field_name)
65c85aa6
MD		 3251{
3252 int ret;
3253
3254 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3255 lttng_kernel_get_type_variant(field->type), nesting,
3256 prev_field_name);
65c85aa6
MD		 3257 if (ret)
3258 return ret;
ceabb767 3259 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3260}
3261
f513b2bf
MD		 3262/*
3263 * Must be called with sessions_mutex held.
3264 */
3265static
8cdc1a81 3266int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3267 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3268 size_t nesting)
3269{
3270 int ret;
437d5aa5
MD		 3271 const struct lttng_kernel_type_array *array_type;
3272 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3273
437d5aa5
MD		 3274 array_type = lttng_kernel_get_type_array(field->type);
3275 WARN_ON_ONCE(!array_type);
ceabb767 3276
437d5aa5 3277 if (array_type->alignment) {
ceabb767 3278 ret = print_tabs(session, nesting);
f513b2bf
MD		 3279 if (ret)
3280 return ret;
ceabb767
MD		 3281 ret = lttng_metadata_printf(session,
3282 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3283 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3284 field->name);
3285 if (ret)
3286 return ret;
3287 }
3288 /*
3289 * Nested compound types: Only array of structures and variants are
3290 * currently supported.
3291 */
437d5aa5 3292 elem_type = array_type->elem_type;
12bb2edb
MD		 3293 switch (elem_type->type) {
3294 case lttng_kernel_type_integer:
437d5aa5
MD		 3295 case lttng_kernel_type_struct:
3296 case lttng_kernel_type_variant:
3297 ret = _lttng_type_statedump(session, elem_type,
3298 array_type->encoding, nesting);
65c85aa6
MD		 3299 if (ret)
3300 return ret;
3301 break;
ceabb767 3302
f513b2bf
MD		 3303 default:
3304 return -EINVAL;
3305 }
3306 ret = lttng_metadata_printf(session,
3307 " _%s[%u];\n",
3308 field->name,
437d5aa5 3309 array_type->length);
f513b2bf
MD		 3310 return ret;
3311}
3312
3313/*
3314 * Must be called with sessions_mutex held.
3315 */
3316static
8cdc1a81 3317int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3318 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3319 size_t nesting,
3320 const char *prev_field_name)
f513b2bf
MD		 3321{
3322 int ret;
3323 const char *length_name;
437d5aa5
MD		 3324 const struct lttng_kernel_type_sequence *sequence_type;
3325 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3326
437d5aa5
MD		 3327 sequence_type = lttng_kernel_get_type_sequence(field->type);
3328 WARN_ON_ONCE(!sequence_type);
f513b2bf 3329
437d5aa5 3330 length_name = sequence_type->length_name;
51ef4536
MD		 3331 if (!length_name)
3332 length_name = prev_field_name;
3333 if (!length_name)
3334 return -EINVAL;
ceabb767 3335
437d5aa5 3336 if (sequence_type->alignment) {
ceabb767 3337 ret = print_tabs(session, nesting);
f513b2bf
MD		 3338 if (ret)
3339 return ret;
ceabb767
MD		 3340 ret = lttng_metadata_printf(session,
3341 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3342 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3343 field->name);
3344 if (ret)
3345 return ret;
3346 }
3347
3348 /*
3349 * Nested compound types: Only array of structures and variants are
3350 * currently supported.
3351 */
437d5aa5 3352 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3353 switch (elem_type->type) {
3354 case lttng_kernel_type_integer:
437d5aa5
MD		 3355 case lttng_kernel_type_struct:
3356 case lttng_kernel_type_variant:
3357 ret = _lttng_type_statedump(session, elem_type,
3358 sequence_type->encoding, nesting);
65c85aa6
MD		 3359 if (ret)
3360 return ret;
3361 break;
ceabb767 3362
f513b2bf
MD		 3363 default:
3364 return -EINVAL;
3365 }
3366 ret = lttng_metadata_printf(session,
3367 " _%s[ _%s ];\n",
3368 field->name,
51ef4536 3369 length_name);
f513b2bf
MD		 3370 return ret;
3371}
3372
141ddf28
MD		 3373/*
3374 * Must be called with sessions_mutex held.
3375 */
3376static
8cdc1a81 3377int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3378 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3379 size_t nesting)
3380{
d96a4a7a 3381 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3382 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3383 int ret;
3384 unsigned int i, nr_entries;
3385
437d5aa5 3386 container_type = type->container_type;
12bb2edb 3387 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3388 ret = -EINVAL;
3389 goto end;
3390 }
437d5aa5 3391 enum_desc = type->desc;
141ddf28
MD		 3392 nr_entries = enum_desc->nr_entries;
3393
3394 ret = print_tabs(session, nesting);
3395 if (ret)
3396 goto end;
ceabb767
MD		 3397 ret = lttng_metadata_printf(session, "enum : ");
3398 if (ret)
3399 goto end;
437d5aa5
MD		 3400 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3401 lttng_kernel_string_encoding_none, 0);
141ddf28 3402 if (ret)
ceabb767
MD		 3403 goto end;
3404 ret = lttng_metadata_printf(session, " {\n");
3405 if (ret)
3406 goto end;
141ddf28
MD		 3407 /* Dump all entries */
3408 for (i = 0; i < nr_entries; i++) {
437d5aa5 3409 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3410 int j, len;
3411
3412 ret = print_tabs(session, nesting + 1);
3413 if (ret)
3414 goto end;
3415 ret = lttng_metadata_printf(session,
3416 "\"");
3417 if (ret)
3418 goto end;
3419 len = strlen(entry->string);
3420 /* Escape the character '"' */
3421 for (j = 0; j < len; j++) {
3422 char c = entry->string[j];
3423
3424 switch (c) {
3425 case '"':
3426 ret = lttng_metadata_printf(session,
3427 "\\\"");
3428 break;
3429 case '\\':
3430 ret = lttng_metadata_printf(session,
3431 "\\\\");
3432 break;
3433 default:
3434 ret = lttng_metadata_printf(session,
3435 "%c", c);
3436 break;
3437 }
3438 if (ret)
3439 goto end;
3440 }
08ad1061
PP		 3441 ret = lttng_metadata_printf(session, "\"");
3442 if (ret)
3443 goto end;
3444
3445 if (entry->options.is_auto) {
3446 ret = lttng_metadata_printf(session, ",\n");
3447 if (ret)
3448 goto end;
141ddf28 3449 } else {
7c559490
MD		 3450 ret = lttng_metadata_printf(session,
3451 " = ");
3452 if (ret)
3453 goto end;
3454 if (entry->start.signedness)
141ddf28 3455 ret = lttng_metadata_printf(session,
7c559490
MD		 3456 "%lld", (long long) entry->start.value);
3457 else
3458 ret = lttng_metadata_printf(session,
3459 "%llu", entry->start.value);
3460 if (ret)
3461 goto end;
3462 if (entry->start.signedness == entry->end.signedness &&
3463 entry->start.value
3464 == entry->end.value) {
141ddf28 3465 ret = lttng_metadata_printf(session,
7c559490
MD		 3466 ",\n");
3467 } else {
3468 if (entry->end.signedness) {
3469 ret = lttng_metadata_printf(session,
3470 " ... %lld,\n",
3471 (long long) entry->end.value);
3472 } else {
3473 ret = lttng_metadata_printf(session,
3474 " ... %llu,\n",
3475 entry->end.value);
3476 }
141ddf28 3477 }
7c559490
MD		 3478 if (ret)
3479 goto end;
141ddf28 3480 }
141ddf28
MD		 3481 }
3482 ret = print_tabs(session, nesting);
3483 if (ret)
3484 goto end;
ceabb767 3485 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3486end:
3487 return ret;
3488}
3489
d83004aa
JD		 3490/*
3491 * Must be called with sessions_mutex held.
3492 */
c099397a 3493static
8cdc1a81 3494int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3495 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3496 size_t nesting)
3497{
3498 int ret;
437d5aa5 3499 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3500
437d5aa5
MD		 3501 enum_type = lttng_kernel_get_type_enum(field->type);
3502 WARN_ON_ONCE(!enum_type);
3503 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3504 if (ret)
3505 return ret;
3506 return lttng_field_name_statedump(session, field, nesting);
3507}
3508
3509static
8cdc1a81 3510int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3511 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3512 size_t nesting)
3513{
3514 int ret;
3515
437d5aa5
MD		 3516 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3517 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3518 if (ret)
3519 return ret;
3520 return lttng_field_name_statedump(session, field, nesting);
3521}
3522
3523static
8cdc1a81 3524int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3525 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3526 size_t nesting)
3527{
3528 int ret;
3529
ceabb767
MD		 3530 /* Default encoding is UTF8 */
3531 ret = print_tabs(session, nesting);
3532 if (ret)
3533 return ret;
3534 ret = lttng_metadata_printf(session,
3535 "string%s",
437d5aa5 3536 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3537 " { encoding = ASCII; }" : "");
3538 return ret;
3539}
3540
3541static
8cdc1a81 3542int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3543 const struct lttng_kernel_event_field *field,
f513b2bf 3544 size_t nesting)
ceabb767 3545{
437d5aa5 3546 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3547 int ret;
3548
437d5aa5
MD		 3549 string_type = lttng_kernel_get_type_string(field->type);
3550 WARN_ON_ONCE(!string_type);
3551 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3552 if (ret)
3553 return ret;
3554 return lttng_field_name_statedump(session, field, nesting);
3555}
3556
3557/*
3558 * Must be called with sessions_mutex held.
3559 */
3560static
8cdc1a81 3561int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3562 const struct lttng_kernel_type_common *type,
3563 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3564 size_t nesting)
c099397a 3565{
c099397a 3566 int ret = 0;
c099397a 3567
12bb2edb
MD		 3568 switch (type->type) {
3569 case lttng_kernel_type_integer:
437d5aa5
MD		 3570 ret = _lttng_integer_type_statedump(session,
3571 lttng_kernel_get_type_integer(type),
3572 parent_encoding, nesting);
8070f5c0 3573 break;
437d5aa5
MD		 3574 case lttng_kernel_type_enum:
3575 ret = _lttng_enum_type_statedump(session,
3576 lttng_kernel_get_type_enum(type),
3577 nesting);
8070f5c0 3578 break;
12bb2edb 3579 case lttng_kernel_type_string:
437d5aa5
MD		 3580 ret = _lttng_string_type_statedump(session,
3581 lttng_kernel_get_type_string(type),
3582 nesting);
ceabb767 3583 break;
437d5aa5
MD		 3584 case lttng_kernel_type_struct:
3585 ret = _lttng_struct_type_statedump(session,
3586 lttng_kernel_get_type_struct(type),
3587 nesting);
8070f5c0 3588 break;
437d5aa5
MD		 3589 case lttng_kernel_type_variant:
3590 ret = _lttng_variant_type_statedump(session,
3591 lttng_kernel_get_type_variant(type),
51ef4536 3592 nesting, NULL);
ceabb767
MD		 3593 break;
3594
3595 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3596 case lttng_kernel_type_array:
3597 case lttng_kernel_type_sequence:
ceabb767
MD		 3598 default:
3599 WARN_ON_ONCE(1);
3600 return -EINVAL;
8070f5c0 3601 }
ceabb767
MD		 3602 return ret;
3603}
8070f5c0 3604
ceabb767
MD		 3605/*
3606 * Must be called with sessions_mutex held.
3607 */
3608static
8cdc1a81 3609int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3610 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3611 size_t nesting,
3612 const char **prev_field_name_p)
ceabb767 3613{
51ef4536 3614 const char *prev_field_name = NULL;
ceabb767 3615 int ret = 0;
27d2368e 3616
51ef4536
MD		 3617 if (prev_field_name_p)
3618 prev_field_name = *prev_field_name_p;
437d5aa5 3619 switch (field->type->type) {
12bb2edb 3620 case lttng_kernel_type_integer:
ceabb767
MD		 3621 ret = _lttng_integer_field_statedump(session, field, nesting);
3622 break;
437d5aa5 3623 case lttng_kernel_type_enum:
ceabb767 3624 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3625 break;
12bb2edb 3626 case lttng_kernel_type_string:
ceabb767 3627 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3628 break;
437d5aa5 3629 case lttng_kernel_type_struct:
ceabb767 3630 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3631 break;
437d5aa5 3632 case lttng_kernel_type_array:
ceabb767 3633 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3634 break;
437d5aa5 3635 case lttng_kernel_type_sequence:
51ef4536 3636 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3637 break;
437d5aa5 3638 case lttng_kernel_type_variant:
51ef4536 3639 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3640 break;
f513b2bf 3641
8070f5c0
MD		 3642 default:
3643 WARN_ON_ONCE(1);
3644 return -EINVAL;
3645 }
51ef4536
MD		 3646 if (prev_field_name_p)
3647 *prev_field_name_p = field->name;
8070f5c0
MD		 3648 return ret;
3649}
3650
3651static
8cdc1a81 3652int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3653 struct lttng_kernel_ctx *ctx)
8070f5c0 3654{
51ef4536 3655 const char *prev_field_name = NULL;
8070f5c0
MD		 3656 int ret = 0;
3657 int i;
3658
3659 if (!ctx)
3660 return 0;
3661 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3662 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3663
51ef4536 3664 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3665 if (ret)
3666 return ret;
3667 }
3668 return ret;
3669}
3670
3671static
8cdc1a81 3672int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3673 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3674{
51ef4536 3675 const char *prev_field_name = NULL;
a67ba386 3676 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3677 int ret = 0;
3678 int i;
3679
6c8c025b
MD		 3680 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3681 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3682
51ef4536 3683 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3684 if (ret)
3685 return ret;
c099397a
MD		 3686 }
3687 return ret;
3688}
3689
d83004aa
JD		 3690/*
3691 * Must be called with sessions_mutex held.
8b97fd42
MD		 3692 * The entire event metadata is printed as a single atomic metadata
3693 * transaction.
d83004aa 3694 */
c099397a 3695static
8cdc1a81 3696int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3697 struct lttng_kernel_channel_buffer *chan,
a67ba386 3698 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3699{
3700 int ret = 0;
3701
a67ba386 3702 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3703 return 0;
f7d06400 3704 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3705 return 0;
3706
8b97fd42
MD		 3707 lttng_metadata_begin(session);
3708
c099397a
MD		 3709 ret = lttng_metadata_printf(session,
3710 "event {\n"
ae734547 3711 " name = \"%s\";\n"
c099397a 3712 " id = %u;\n"
b9074a1b 3713 " stream_id = %u;\n",
a67ba386
MD		 3714 event_recorder->priv->parent.desc->event_name,
3715 event_recorder->priv->id,
f7d06400 3716 event_recorder->chan->priv->id);
c099397a
MD		 3717 if (ret)
3718 goto end;
3719
8070f5c0 3720 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3721 " fields := struct {\n"
3722 );
3723 if (ret)
3724 goto end;
3725
a67ba386 3726 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3727 if (ret)
3728 goto end;
3729
3730 /*
3731 * LTTng space reservation can only reserve multiples of the
3732 * byte size.
3733 */
3734 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3735 " };\n"
3736 "};\n\n");
c099397a
MD		 3737 if (ret)
3738 goto end;
3739
a67ba386 3740 event_recorder->priv->metadata_dumped = 1;
c099397a 3741end:
8b97fd42 3742 lttng_metadata_end(session);
c099397a
MD		 3743 return ret;
3744
3745}
3746
d83004aa
JD		 3747/*
3748 * Must be called with sessions_mutex held.
8b97fd42
MD		 3749 * The entire channel metadata is printed as a single atomic metadata
3750 * transaction.
d83004aa 3751 */
c099397a 3752static
8cdc1a81 3753int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3754 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3755{
3756 int ret = 0;
3757
f7d06400 3758 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3759 return 0;
d83004aa 3760
f7d06400 3761 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3762 return 0;
3763
8b97fd42
MD		 3764 lttng_metadata_begin(session);
3765
f7d06400 3766 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3767 ret = lttng_metadata_printf(session,
3768 "stream {\n"
3769 " id = %u;\n"
9115fbdc 3770 " event.header := %s;\n"
b9074a1b 3771 " packet.context := struct packet_context;\n",
f7d06400
MD		 3772 chan->priv->id,
3773 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3774 "struct event_header_large");
3775 if (ret)
3776 goto end;
3777
f7d06400 3778 if (chan->priv->ctx) {
b9074a1b
MD		 3779 ret = lttng_metadata_printf(session,
3780 " event.context := struct {\n");
3781 if (ret)
3782 goto end;
3783 }
f7d06400 3784 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3785 if (ret)
3786 goto end;
f7d06400 3787 if (chan->priv->ctx) {
b9074a1b
MD		 3788 ret = lttng_metadata_printf(session,
3789 " };\n");
3790 if (ret)
3791 goto end;
3792 }
8070f5c0
MD		 3793
3794 ret = lttng_metadata_printf(session,
b9074a1b 3795 "};\n\n");
8070f5c0 3796
f7d06400 3797 chan->priv->metadata_dumped = 1;
c099397a 3798end:
8b97fd42 3799 lttng_metadata_end(session);
c099397a
MD		 3800 return ret;
3801}
3802
d83004aa
JD		 3803/*
3804 * Must be called with sessions_mutex held.
3805 */
9115fbdc 3806static
8cdc1a81 3807int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3808{
3809 return lttng_metadata_printf(session,
3810 "struct packet_context {\n"
a3ccff4f
MD		 3811 " uint64_clock_monotonic_t timestamp_begin;\n"
3812 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3813 " uint64_t content_size;\n"
3814 " uint64_t packet_size;\n"
5b3cf4f9 3815 " uint64_t packet_seq_num;\n"
a9afe705 3816 " unsigned long events_discarded;\n"
9115fbdc 3817 " uint32_t cpu_id;\n"
c6dfdf6f 3818 "};\n\n"
9115fbdc
MD		 3819 );
3820}
3821
3822/*
3823 * Compact header:
3824 * id: range: 0 - 30.
3825 * id 31 is reserved to indicate an extended header.
3826 *
3827 * Large header:
3828 * id: range: 0 - 65534.
3829 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3830 *
3831 * Must be called with sessions_mutex held.
9115fbdc
MD		 3832 */
3833static
8cdc1a81 3834int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3835{
3836 return lttng_metadata_printf(session,
3837 "struct event_header_compact {\n"
3838 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3839 " variant <id> {\n"
3840 " struct {\n"
a3ccff4f 3841 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3842 " } compact;\n"
3843 " struct {\n"
3844 " uint32_t id;\n"
a3ccff4f 3845 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3846 " } extended;\n"
3847 " } v;\n"
3848 "} align(%u);\n"
3849 "\n"
3850 "struct event_header_large {\n"
3851 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3852 " variant <id> {\n"
3853 " struct {\n"
a3ccff4f 3854 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3855 " } compact;\n"
3856 " struct {\n"
3857 " uint32_t id;\n"
a3ccff4f 3858 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3859 " } extended;\n"
3860 " } v;\n"
3861 "} align(%u);\n\n",
a90917c3
MD		 3862 lttng_alignof(uint32_t) * CHAR_BIT,
3863 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3864 );
3865}
3866
a3ccff4f
MD		 3867 /*
3868 * Approximation of NTP time of day to clock monotonic correlation,
3869 * taken at start of trace.
3870 * Yes, this is only an approximation. Yes, we can (and will) do better
3871 * in future versions.
5283350b
MD		 3872 * This function may return a negative offset. It may happen if the
3873 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3874 *
3875 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3876 * y2038 compliant.
a3ccff4f
MD		 3877 */
3878static
8967b2a3 3879int64_t measure_clock_offset(void)
a3ccff4f 3880{
dcb93448 3881 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3882 uint64_t tcf = trace_clock_freq();
dcb93448 3883 int64_t offset;
a3ccff4f 3884 unsigned long flags;
3636085f
MJ		 3885#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3886 struct timespec64 rts = { 0, 0 };
3887#else
3888 struct timespec rts = { 0, 0 };
3889#endif
a3ccff4f
MD		 3890
3891 /* Disable interrupts to increase correlation precision. */
3892 local_irq_save(flags);
3893 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3894#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3895 ktime_get_real_ts64(&rts);
3896#else
216b6baa 3897 getnstimeofday(&rts);
3636085f 3898#endif
a3ccff4f
MD		 3899 monotonic[1] = trace_clock_read64();
3900 local_irq_restore(flags);
3901
dcb93448 3902 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3903 realtime = (uint64_t) rts.tv_sec * tcf;
3904 if (tcf == NSEC_PER_SEC) {
3905 realtime += rts.tv_nsec;
3906 } else {
3907 uint64_t n = rts.tv_nsec * tcf;
3908
3909 do_div(n, NSEC_PER_SEC);
3910 realtime += n;
3911 }
dcb93448 3912 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3913 return offset;
3914}
3915
3eb95be4 3916static
8cdc1a81 3917int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3918{
0f3eaad4 3919 int ret = 0;
3eb95be4
JR		 3920 size_t i;
3921 char cur;
3922
3923 i = 0;
3924 cur = string[i];
3925 while (cur != '\0') {
3926 switch (cur) {
3927 case '\n':
3928 ret = lttng_metadata_printf(session, "%s", "\\n");
3929 break;
3930 case '\\':
3931 case '"':
3932 ret = lttng_metadata_printf(session, "%c", '\\');
3933 if (ret)
3934 goto error;
3935 /* We still print the current char */
c190d76e 3936 lttng_fallthrough;
3eb95be4
JR		 3937 default:
3938 ret = lttng_metadata_printf(session, "%c", cur);
3939 break;
3940 }
3941
3942 if (ret)
3943 goto error;
3944
3945 cur = string[++i];
3946 }
3947error:
3948 return ret;
3949}
3950
3951static
8cdc1a81 3952int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3953 const char *field_value)
3eb95be4
JR		 3954{
3955 int ret;
3956
1c88f269 3957 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3958 if (ret)
3959 goto error;
3960
1c88f269 3961 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3962 if (ret)
3963 goto error;
3964
3965 ret = lttng_metadata_printf(session, "\";\n");
3966
3967error:
3968 return ret;
3969}
3970
c099397a
MD		 3971/*
3972 * Output metadata into this session's metadata buffers.
d83004aa 3973 * Must be called with sessions_mutex held.
c099397a
MD		 3974 */
3975static
8cdc1a81 3976int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3977{
8cdc1a81 3978 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3979 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3980 const char *product_uuid;
f7d06400 3981 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3982 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3983 int ret = 0;
3984
585e5dcc 3985 if (!LTTNG_READ_ONCE(session->active))
c099397a 3986 return 0;
8b97fd42
MD		 3987
3988 lttng_metadata_begin(session);
3989
8cdc1a81 3990 if (session->priv->metadata_dumped)
c099397a 3991 goto skip_session;
c099397a 3992
d793d5e1 3993 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3994 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3995 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3996 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3997 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3998 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3999
4000 ret = lttng_metadata_printf(session,
9115fbdc
MD		 4001 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4002 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4003 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4004 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 4005 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 4006 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4007 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 4008 "\n"
4009 "trace {\n"
4010 " major = %u;\n"
4011 " minor = %u;\n"
30bdb6e4 4012 " uuid = \"%s\";\n"
d793d5e1
MD		 4013 " byte_order = %s;\n"
4014 " packet.header := struct {\n"
4015 " uint32_t magic;\n"
1ec3f75a 4016 " uint8_t uuid[16];\n"
d793d5e1 4017 " uint32_t stream_id;\n"
5594698f 4018 " uint64_t stream_instance_id;\n"
0eb25f58 4019 " };\n"
d793d5e1 4020 "};\n\n",
a90917c3
MD		 4021 lttng_alignof(uint8_t) * CHAR_BIT,
4022 lttng_alignof(uint16_t) * CHAR_BIT,
4023 lttng_alignof(uint32_t) * CHAR_BIT,
4024 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 4025 sizeof(unsigned long) * CHAR_BIT,
4026 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 4027 CTF_SPEC_MAJOR,
4028 CTF_SPEC_MINOR,
d793d5e1 4029 uuid_s,
5214fa50 4030#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 4031 "be"
4032#else
4033 "le"
4034#endif
4035 );
4036 if (ret)
4037 goto end;
4038
99dc9597
MD		 4039 ret = lttng_metadata_printf(session,
4040 "env {\n"
a6058143 4041 " hostname = \"%s\";\n"
c6c9e10f 4042 " domain = \"kernel\";\n"
99dc9597 4043 " sysname = \"%s\";\n"
c6c9e10f
MD		 4044 " kernel_release = \"%s\";\n"
4045 " kernel_version = \"%s\";\n"
4046 " tracer_name = \"lttng-modules\";\n"
4047 " tracer_major = %d;\n"
4048 " tracer_minor = %d;\n"
4049 " tracer_patchlevel = %d;\n"
3eb95be4 4050 " trace_buffering_scheme = \"global\";\n",
3d0d43db 4051 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 4052 utsname()->sysname,
4053 utsname()->release,
c6c9e10f
MD		 4054 utsname()->version,
4055 LTTNG_MODULES_MAJOR_VERSION,
4056 LTTNG_MODULES_MINOR_VERSION,
4057 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 4058 );
4059 if (ret)
4060 goto end;
4061
8cdc1a81 4062 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4063 if (ret)
4064 goto end;
4065 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4066 session->priv->creation_time);
3eb95be4
JR		 4067 if (ret)
4068 goto end;
4069
c88f762e
GB		 4070 /* Add the product UUID to the 'env' section */
4071 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4072 if (product_uuid) {
4073 ret = lttng_metadata_printf(session,
4074 " product_uuid = \"%s\";\n",
4075 product_uuid
4076 );
4077 if (ret)
4078 goto end;
4079 }
4080
4081 /* Close the 'env' section */
3eb95be4
JR		 4082 ret = lttng_metadata_printf(session, "};\n\n");
4083 if (ret)
4084 goto end;
4085
a3ccff4f
MD		 4086 ret = lttng_metadata_printf(session,
4087 "clock {\n"
2754583e
MD		 4088 " name = \"%s\";\n",
4089 trace_clock_name()
a82c63f1
MD		 4090 );
4091 if (ret)
4092 goto end;
4093
4094 if (!trace_clock_uuid(clock_uuid_s)) {
4095 ret = lttng_metadata_printf(session,
7c27cb17 4096 " uuid = \"%s\";\n",
a82c63f1
MD		 4097 clock_uuid_s
4098 );
4099 if (ret)
4100 goto end;
4101 }
4102
4103 ret = lttng_metadata_printf(session,
2754583e 4104 " description = \"%s\";\n"
a3ccff4f
MD		 4105 " freq = %llu; /* Frequency, in Hz */\n"
4106 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4107 " offset = %lld;\n"
a3ccff4f 4108 "};\n\n",
2754583e 4109 trace_clock_description(),
a3ccff4f 4110 (unsigned long long) trace_clock_freq(),
8967b2a3 4111 (long long) measure_clock_offset()
a3ccff4f
MD		 4112 );
4113 if (ret)
4114 goto end;
4115
4116 ret = lttng_metadata_printf(session,
4117 "typealias integer {\n"
4118 " size = 27; align = 1; signed = false;\n"
2754583e 4119 " map = clock.%s.value;\n"
a3ccff4f
MD		 4120 "} := uint27_clock_monotonic_t;\n"
4121 "\n"
4122 "typealias integer {\n"
4123 " size = 32; align = %u; signed = false;\n"
2754583e 4124 " map = clock.%s.value;\n"
a3ccff4f
MD		 4125 "} := uint32_clock_monotonic_t;\n"
4126 "\n"
4127 "typealias integer {\n"
4128 " size = 64; align = %u; signed = false;\n"
2754583e 4129 " map = clock.%s.value;\n"
a3ccff4f 4130 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4131 trace_clock_name(),
a3ccff4f 4132 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4133 trace_clock_name(),
4134 lttng_alignof(uint64_t) * CHAR_BIT,
4135 trace_clock_name()
a3ccff4f
MD		 4136 );
4137 if (ret)
4138 goto end;
4139
a90917c3 4140 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4141 if (ret)
4142 goto end;
4143
a90917c3 4144 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4145 if (ret)
4146 goto end;
4147
c099397a 4148skip_session:
f7d06400
MD		 4149 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4150 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4151 if (ret)
4152 goto end;
4153 }
4154
8cdc1a81 4155 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386
MD		 4156 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4157 event_recorder_priv->pub);
c099397a
MD		 4158 if (ret)
4159 goto end;
4160 }
8cdc1a81 4161 session->priv->metadata_dumped = 1;
c099397a 4162end:
8b97fd42 4163 lttng_metadata_end(session);
c099397a
MD		 4164 return ret;
4165}
4166
c0e31d2e 4167/**
a90917c3 4168 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4169 * @transport: transport structure
4170 *
4171 * Registers a transport which can be used as output to extract the data out of
4172 * LTTng. The module calling this registration function must ensure that no
4173 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4174 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4175 * is made visible to the transport function. This registration acts as a
263b6c88 4176 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4177 * after its registration must it synchronize the TLBs.
4178 */
a90917c3 4179void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4180{
4181 /*
4182 * Make sure no page fault can be triggered by the module about to be
4183 * registered. We deal with this here so we don't have to call
263b6c88 4184 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4185 */
263b6c88 4186 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4187
4188 mutex_lock(&sessions_mutex);
a90917c3 4189 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4190 mutex_unlock(&sessions_mutex);
4191}
a90917c3 4192EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4193
4194/**
a90917c3 4195 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4196 * @transport: transport structure
4197 */
a90917c3 4198void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4199{
4200 mutex_lock(&sessions_mutex);
4201 list_del(&transport->node);
4202 mutex_unlock(&sessions_mutex);
4203}
a90917c3 4204EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4205
a101fa10
MD		 4206void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4207{
4208 /*
4209 * Make sure no page fault can be triggered by the module about to be
4210 * registered. We deal with this here so we don't have to call
4211 * vmalloc_sync_mappings() in each module's init.
4212 */
4213 wrapper_vmalloc_sync_mappings();
4214
4215 mutex_lock(&sessions_mutex);
4216 list_add_tail(&transport->node, &lttng_counter_transport_list);
4217 mutex_unlock(&sessions_mutex);
4218}
4219EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4220
4221void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4222{
4223 mutex_lock(&sessions_mutex);
4224 list_del(&transport->node);
4225 mutex_unlock(&sessions_mutex);
4226}
4227EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4228
5f4c791e 4229#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4230
4231enum cpuhp_state lttng_hp_prepare;
4232enum cpuhp_state lttng_hp_online;
4233
4234static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4235{
4236 struct lttng_cpuhp_node *lttng_node;
4237
4238 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4239 switch (lttng_node->component) {
4240 case LTTNG_RING_BUFFER_FRONTEND:
4241 return 0;
4242 case LTTNG_RING_BUFFER_BACKEND:
4243 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4244 case LTTNG_RING_BUFFER_ITER:
4245 return 0;
4246 case LTTNG_CONTEXT_PERF_COUNTERS:
4247 return 0;
4248 default:
4249 return -EINVAL;
4250 }
4251}
4252
4253static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4254{
4255 struct lttng_cpuhp_node *lttng_node;
4256
4257 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4258 switch (lttng_node->component) {
4259 case LTTNG_RING_BUFFER_FRONTEND:
4260 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4261 case LTTNG_RING_BUFFER_BACKEND:
4262 return 0;
4263 case LTTNG_RING_BUFFER_ITER:
4264 return 0;
4265 case LTTNG_CONTEXT_PERF_COUNTERS:
4266 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4267 default:
4268 return -EINVAL;
4269 }
4270}
4271
4272static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4273{
4274 struct lttng_cpuhp_node *lttng_node;
4275
4276 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4277 switch (lttng_node->component) {
4278 case LTTNG_RING_BUFFER_FRONTEND:
4279 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4280 case LTTNG_RING_BUFFER_BACKEND:
4281 return 0;
4282 case LTTNG_RING_BUFFER_ITER:
4283 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4284 case LTTNG_CONTEXT_PERF_COUNTERS:
4285 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4286 default:
4287 return -EINVAL;
4288 }
4289}
4290
4291static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4292{
4293 struct lttng_cpuhp_node *lttng_node;
4294
4295 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4296 switch (lttng_node->component) {
4297 case LTTNG_RING_BUFFER_FRONTEND:
4298 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4299 case LTTNG_RING_BUFFER_BACKEND:
4300 return 0;
4301 case LTTNG_RING_BUFFER_ITER:
4302 return 0;
4303 case LTTNG_CONTEXT_PERF_COUNTERS:
4304 return 0;
4305 default:
4306 return -EINVAL;
4307 }
4308}
4309
4310static int __init lttng_init_cpu_hotplug(void)
4311{
4312 int ret;
4313
4314 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4315 lttng_hotplug_prepare,
4316 lttng_hotplug_dead);
4317 if (ret < 0) {
4318 return ret;
4319 }
4320 lttng_hp_prepare = ret;
4321 lttng_rb_set_hp_prepare(ret);
4322
4323 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4324 lttng_hotplug_online,
4325 lttng_hotplug_offline);
4326 if (ret < 0) {
4327 cpuhp_remove_multi_state(lttng_hp_prepare);
4328 lttng_hp_prepare = 0;
4329 return ret;
4330 }
4331 lttng_hp_online = ret;
4332 lttng_rb_set_hp_online(ret);
4333
4334 return 0;
4335}
4336
4337static void __exit lttng_exit_cpu_hotplug(void)
4338{
4339 lttng_rb_set_hp_online(0);
4340 cpuhp_remove_multi_state(lttng_hp_online);
4341 lttng_rb_set_hp_prepare(0);
4342 cpuhp_remove_multi_state(lttng_hp_prepare);
4343}
4344
5f4c791e 4345#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4346static int lttng_init_cpu_hotplug(void)
4347{
4348 return 0;
4349}
4350static void lttng_exit_cpu_hotplug(void)
4351{
4352}
5f4c791e 4353#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4354
a90917c3 4355static int __init lttng_events_init(void)
4e3c1b9b 4356{
1c25284c
MD		 4357 int ret;
4358
453b2495
JD		 4359 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4360 if (ret)
4361 return ret;
389d7070 4362 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4363 if (ret)
4364 return ret;
4365 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4366 if (ret)
4367 return ret;
4368 ret = lttng_probes_init();
389d7070
MD		 4369 if (ret)
4370 return ret;
07dfc1d0 4371 ret = lttng_context_init();
20591cf7
MD		 4372 if (ret)
4373 return ret;
07dfc1d0
MD		 4374 ret = lttng_tracepoint_init();
4375 if (ret)
4376 goto error_tp;
a67ba386
MD		 4377 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4378 if (!event_recorder_cache) {
20591cf7 4379 ret = -ENOMEM;
a67ba386 4380 goto error_kmem_event_recorder;
dffef45d 4381 }
a67ba386
MD		 4382 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4383 if (!event_recorder_private_cache) {
4384 ret = -ENOMEM;
4385 goto error_kmem_event_recorder_private;
4386 }
4387 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4388 if (!event_notifier_cache) {
4389 ret = -ENOMEM;
4390 goto error_kmem_event_notifier;
20591cf7 4391 }
a67ba386
MD		 4392 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4393 if (!event_notifier_private_cache) {
4394 ret = -ENOMEM;
4395 goto error_kmem_event_notifier_private;
4396 }
80996790 4397 ret = lttng_abi_init();
02119ee5
MD		 4398 if (ret)
4399 goto error_abi;
0c956676
MD		 4400 ret = lttng_logger_init();
4401 if (ret)
4402 goto error_logger;
1e367326
MD		 4403 ret = lttng_init_cpu_hotplug();
4404 if (ret)
4405 goto error_hotplug;
101215b7 4406 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4407 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4408 __stringify(LTTNG_MODULES_MINOR_VERSION),
4409 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4410 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4411 LTTNG_VERSION_NAME,
4412#ifdef LTTNG_EXTRA_VERSION_GIT
4413 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4414#else
4415 "",
4416#endif
4417#ifdef LTTNG_EXTRA_VERSION_NAME
4418 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4419#else
4420 "");
4421#endif
c1551e57
MJ		 4422#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4423 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4424#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4425 return 0;
0c956676 4426
1e367326
MD		 4427error_hotplug:
4428 lttng_logger_exit();
0c956676
MD		 4429error_logger:
4430 lttng_abi_exit();
02119ee5 4431error_abi:
a67ba386
MD		 4432 kmem_cache_destroy(event_notifier_private_cache);
4433error_kmem_event_notifier_private:
dffef45d
FD		 4434 kmem_cache_destroy(event_notifier_cache);
4435error_kmem_event_notifier:
a67ba386
MD		 4436 kmem_cache_destroy(event_recorder_private_cache);
4437error_kmem_event_recorder_private:
4438 kmem_cache_destroy(event_recorder_cache);
4439error_kmem_event_recorder:
20591cf7 4440 lttng_tracepoint_exit();
07dfc1d0
MD		 4441error_tp:
4442 lttng_context_exit();
101215b7 4443 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4444 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4445 __stringify(LTTNG_MODULES_MINOR_VERSION),
4446 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4447 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4448 LTTNG_VERSION_NAME,
4449#ifdef LTTNG_EXTRA_VERSION_GIT
4450 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4451#else
4452 "",
4453#endif
4454#ifdef LTTNG_EXTRA_VERSION_NAME
4455 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4456#else
4457 "");
4458#endif
1c25284c 4459 return ret;
4e3c1b9b
MD		 4460}
4461
a90917c3 4462module_init(lttng_events_init);
11b5a3c2 4463
a90917c3 4464static void __exit lttng_events_exit(void)
4e3c1b9b 4465{
8cdc1a81 4466 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4467
1e367326 4468 lttng_exit_cpu_hotplug();
0c956676 4469 lttng_logger_exit();
80996790 4470 lttng_abi_exit();
8cdc1a81
MD		 4471 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4472 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4473 kmem_cache_destroy(event_recorder_cache);
4474 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4475 kmem_cache_destroy(event_notifier_cache);
a67ba386 4476 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4477 lttng_tracepoint_exit();
07dfc1d0 4478 lttng_context_exit();
101215b7 4479 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4480 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4481 __stringify(LTTNG_MODULES_MINOR_VERSION),
4482 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4483 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4484 LTTNG_VERSION_NAME,
4485#ifdef LTTNG_EXTRA_VERSION_GIT
4486 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4487#else
4488 "",
4489#endif
4490#ifdef LTTNG_EXTRA_VERSION_NAME
4491 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4492#else
4493 "");
4494#endif
4e3c1b9b 4495}
92e94819 4496
a90917c3 4497module_exit(lttng_events_exit);
11b5a3c2 4498
7ca11e77 4499#include <generated/patches.h>
101215b7
MJ		 4500#ifdef LTTNG_EXTRA_VERSION_GIT
4501MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4502#endif
4503#ifdef LTTNG_EXTRA_VERSION_NAME
4504MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4505#endif
92e94819
MD		 4506MODULE_LICENSE("GPL and additional rights");
4507MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4508MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4509MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4510 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4511 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4512 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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