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Warn on event registration/unregistration failure
[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);
6a338ba4 74static void _lttng_event_unregister(struct lttng_kernel_event_common *event);
c099397a 75static
ee7e9a18 76int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event);
c099397a 77static
8cdc1a81 78int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 79static
80void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 81static
8cdc1a81 82int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 83 const struct lttng_kernel_type_common *type,
84 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 85 size_t nesting);
86static
8cdc1a81 87int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 88 const struct lttng_kernel_event_field *field,
51ef4536 89 size_t nesting, const char **prev_field_name_p);
c099397a 90
c099397a 91void synchronize_trace(void)
abcca994 92{
05355f0b
MJ		 93#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
94 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 95 synchronize_rcu();
96#else
abcca994 97 synchronize_sched();
92da05ce
MJ		 98#endif
99
5f4c791e 100#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 101#ifdef CONFIG_PREEMPT_RT_FULL
102 synchronize_rcu();
103#endif
5f4c791e 104#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 105#ifdef CONFIG_PREEMPT_RT
106 synchronize_rcu();
107#endif
5f4c791e 108#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 109}
110
3c997079
MD		 111void lttng_lock_sessions(void)
112{
113 mutex_lock(&sessions_mutex);
114}
115
116void lttng_unlock_sessions(void)
117{
118 mutex_unlock(&sessions_mutex);
119}
120
9fe593d2
FD		 121static struct lttng_transport *lttng_transport_find(const char *name)
122{
123 struct lttng_transport *transport;
124
125 list_for_each_entry(transport, &lttng_transport_list, node) {
126 if (!strcmp(transport->name, name))
127 return transport;
128 }
129 return NULL;
130}
131
3c997079
MD		 132/*
133 * Called with sessions lock held.
134 */
135int lttng_session_active(void)
136{
8cdc1a81 137 struct lttng_kernel_session_private *iter;
3c997079
MD		 138
139 list_for_each_entry(iter, &sessions, list) {
8cdc1a81 140 if (iter->pub->active)
3c997079
MD		 141 return 1;
142 }
143 return 0;
144}
145
8cdc1a81 146struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 147{
8cdc1a81
MD		 148 struct lttng_kernel_session *session;
149 struct lttng_kernel_session_private *session_priv;
d83004aa 150 struct lttng_metadata_cache *metadata_cache;
3c997079 151 int i;
4e3c1b9b
MD		 152
153 mutex_lock(&sessions_mutex);
8cdc1a81 154 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 155 if (!session)
d83004aa 156 goto err;
8cdc1a81
MD		 157 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
158 if (!session_priv)
159 goto err_free_session;
160 session->priv = session_priv;
161 session_priv->pub = session;
162
163 INIT_LIST_HEAD(&session_priv->chan);
164 INIT_LIST_HEAD(&session_priv->events);
165 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 166
167 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
168 GFP_KERNEL);
169 if (!metadata_cache)
8cdc1a81 170 goto err_free_session_private;
0ca42eb7 171 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 172 if (!metadata_cache->data)
173 goto err_free_cache;
174 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
175 kref_init(&metadata_cache->refcount);
92d9f5e6 176 mutex_init(&metadata_cache->lock);
8cdc1a81 177 session_priv->metadata_cache = metadata_cache;
d83004aa 178 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
8cdc1a81 179 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 180 sizeof(metadata_cache->uuid));
8cdc1a81 181 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 182 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
8cdc1a81
MD		 183 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
184 list_add(&session_priv->list, &sessions);
185
8c0393c3
MD		 186 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
187 goto tracker_alloc_error;
188 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
189 goto tracker_alloc_error;
190 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
191 goto tracker_alloc_error;
192 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
193 goto tracker_alloc_error;
194 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
195 goto tracker_alloc_error;
196 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
197 goto tracker_alloc_error;
198
4e3c1b9b 199 mutex_unlock(&sessions_mutex);
8cdc1a81 200
4e3c1b9b 201 return session;
d83004aa 202
8c0393c3
MD		 203tracker_alloc_error:
204 lttng_id_tracker_fini(&session->pid_tracker);
205 lttng_id_tracker_fini(&session->vpid_tracker);
206 lttng_id_tracker_fini(&session->uid_tracker);
207 lttng_id_tracker_fini(&session->vuid_tracker);
208 lttng_id_tracker_fini(&session->gid_tracker);
209 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 210err_free_cache:
211 kfree(metadata_cache);
8cdc1a81
MD		 212err_free_session_private:
213 lttng_kvfree(session_priv);
d83004aa 214err_free_session:
48f5e0b5 215 lttng_kvfree(session);
d83004aa
JD		 216err:
217 mutex_unlock(&sessions_mutex);
218 return NULL;
219}
220
99f52fcc
FD		 221static
222struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
223{
224 struct lttng_counter_transport *transport;
225
226 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
227 if (!strcmp(transport->name, name))
228 return transport;
229 }
230 return NULL;
231}
232
233struct lttng_counter *lttng_kernel_counter_create(
234 const char *counter_transport_name,
235 size_t number_dimensions, const size_t *dimensions_sizes)
236{
237 struct lttng_counter *counter = NULL;
238 struct lttng_counter_transport *counter_transport = NULL;
239
240 counter_transport = lttng_counter_transport_find(counter_transport_name);
241 if (!counter_transport) {
242 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
243 counter_transport_name);
244 goto notransport;
245 }
246 if (!try_module_get(counter_transport->owner)) {
247 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
248 goto notransport;
249 }
250
251 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
252 if (!counter)
253 goto nomem;
254
255 /* Create event notifier error counter. */
256 counter->ops = &counter_transport->ops;
257 counter->transport = counter_transport;
258
259 counter->counter = counter->ops->counter_create(
260 number_dimensions, dimensions_sizes, 0);
261 if (!counter->counter) {
262 goto create_error;
263 }
264
265 return counter;
266
267create_error:
268 lttng_kvfree(counter);
269nomem:
270 if (counter_transport)
271 module_put(counter_transport->owner);
272notransport:
273 return NULL;
274}
275
750b05f2
FD		 276struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
277{
278 struct lttng_transport *transport = NULL;
279 struct lttng_event_notifier_group *event_notifier_group;
280 const char *transport_name = "relay-event-notifier";
281 size_t subbuf_size = 4096; //TODO
282 size_t num_subbuf = 16; //TODO
283 unsigned int switch_timer_interval = 0;
284 unsigned int read_timer_interval = 0;
dffef45d 285 int i;
750b05f2
FD		 286
287 mutex_lock(&sessions_mutex);
288
289 transport = lttng_transport_find(transport_name);
290 if (!transport) {
291 printk(KERN_WARNING "LTTng: transport %s not found\n",
292 transport_name);
293 goto notransport;
294 }
295 if (!try_module_get(transport->owner)) {
296 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
297 transport_name);
298 goto notransport;
299 }
300
301 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
302 GFP_KERNEL);
303 if (!event_notifier_group)
304 goto nomem;
305
306 /*
307 * Initialize the ring buffer used to store event notifier
308 * notifications.
309 */
310 event_notifier_group->ops = &transport->ops;
4a399b76 311 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 312 transport_name, event_notifier_group, NULL,
313 subbuf_size, num_subbuf, switch_timer_interval,
314 read_timer_interval);
315 if (!event_notifier_group->chan)
316 goto create_error;
317
318 event_notifier_group->transport = transport;
dffef45d
FD		 319
320 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
321 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
33af697f
MD		 322 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
323 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
dffef45d 324
750b05f2
FD		 325 list_add(&event_notifier_group->node, &event_notifier_groups);
326
327 mutex_unlock(&sessions_mutex);
328
329 return event_notifier_group;
330
331create_error:
332 lttng_kvfree(event_notifier_group);
333nomem:
334 if (transport)
335 module_put(transport->owner);
336notransport:
337 mutex_unlock(&sessions_mutex);
338 return NULL;
339}
340
d83004aa
JD		 341void metadata_cache_destroy(struct kref *kref)
342{
343 struct lttng_metadata_cache *cache =
344 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 345 vfree(cache->data);
d83004aa 346 kfree(cache);
4e3c1b9b
MD		 347}
348
8cdc1a81 349void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 350{
f7d06400 351 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 352 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 353 struct lttng_metadata_stream *metadata_stream;
09710b83 354 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
dda6a249 355 int ret;
4e3c1b9b
MD		 356
357 mutex_lock(&sessions_mutex);
a8f2d0c7 358 WRITE_ONCE(session->active, 0);
f7d06400 359 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 360 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 361 WARN_ON(ret);
362 }
6a338ba4
MD		 363 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node)
364 _lttng_event_unregister(&event_recorder_priv->pub->parent);
abcca994 365 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400 366 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 367 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
badfe9f5
MD		 368 WARN_ON(ret);
369 }
09710b83
MD		 370 list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node)
371 lttng_event_enabler_destroy(event_enabler);
f237aef8 372 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node)
0648898e 373 _lttng_event_destroy(&event_recorder_priv->pub->parent);
f7d06400
MD		 374 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
375 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
376 _lttng_channel_destroy(chan_priv->pub);
d83004aa 377 }
8cdc1a81
MD		 378 mutex_lock(&session->priv->metadata_cache->lock);
379 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
d83004aa 380 _lttng_metadata_channel_hangup(metadata_stream);
8cdc1a81 381 mutex_unlock(&session->priv->metadata_cache->lock);
8c0393c3
MD		 382 lttng_id_tracker_fini(&session->pid_tracker);
383 lttng_id_tracker_fini(&session->vpid_tracker);
384 lttng_id_tracker_fini(&session->uid_tracker);
385 lttng_id_tracker_fini(&session->vuid_tracker);
386 lttng_id_tracker_fini(&session->gid_tracker);
387 lttng_id_tracker_fini(&session->vgid_tracker);
8cdc1a81
MD		 388 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
389 list_del(&session->priv->list);
4e3c1b9b 390 mutex_unlock(&sessions_mutex);
8cdc1a81 391 lttng_kvfree(session->priv);
48f5e0b5 392 lttng_kvfree(session);
4e3c1b9b
MD		 393}
394
dffef45d
FD		 395void lttng_event_notifier_group_destroy(
396 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 397{
09710b83 398 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
a67ba386 399 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 400 int ret;
401
750b05f2
FD		 402 if (!event_notifier_group)
403 return;
404
405 mutex_lock(&sessions_mutex);
dffef45d 406
6053e75e 407 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
8a8ac9a8
FD		 408 WARN_ON(ret);
409
a67ba386 410 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
6a338ba4
MD		 411 &event_notifier_group->event_notifiers_head, parent.node)
412 _lttng_event_unregister(&event_notifier_priv->pub->parent);
dffef45d 413
b01155ba
FD		 414 /* Wait for in-flight event notifier to complete */
415 synchronize_trace();
416
21f58fb7
FD		 417 irq_work_sync(&event_notifier_group->wakeup_pending);
418
6053e75e
MD		 419 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
420 WARN_ON(ret);
8a8ac9a8 421
09710b83 422 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
dffef45d 423 &event_notifier_group->enablers_head, node)
09710b83 424 lttng_event_enabler_destroy(event_enabler);
dffef45d 425
a67ba386 426 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 427 &event_notifier_group->event_notifiers_head, parent.node)
0648898e 428 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 429
99f52fcc
FD		 430 if (event_notifier_group->error_counter) {
431 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 432
99f52fcc
FD		 433 error_counter->ops->counter_destroy(error_counter->counter);
434 module_put(error_counter->transport->owner);
435 lttng_kvfree(error_counter);
436 event_notifier_group->error_counter = NULL;
437 }
438
4a399b76 439 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 440 module_put(event_notifier_group->transport->owner);
441 list_del(&event_notifier_group->node);
dffef45d 442
750b05f2
FD		 443 mutex_unlock(&sessions_mutex);
444 lttng_kvfree(event_notifier_group);
445}
446
8cdc1a81 447int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 448{
449 int ret;
450
451 mutex_lock(&sessions_mutex);
452 ret = lttng_statedump_start(session);
453 mutex_unlock(&sessions_mutex);
454 return ret;
455}
456
8cdc1a81 457int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 458{
459 int ret = 0;
f7d06400 460 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 461
462 mutex_lock(&sessions_mutex);
463 if (session->active) {
464 ret = -EBUSY;
465 goto end;
466 }
c099397a 467
3c997079 468 /* Set transient enabler state to "enabled" */
8cdc1a81 469 session->priv->tstate = 1;
3c997079 470
4ef81e4a 471 /* We need to sync enablers with session before activation. */
b2bc0bc8 472 lttng_session_sync_event_enablers(session);
4ef81e4a 473
c099397a
MD		 474 /*
475 * Snapshot the number of events per channel to know the type of header
476 * we need to use.
477 */
f7d06400
MD		 478 list_for_each_entry(chan_priv, &session->priv->chan, node) {
479 if (chan_priv->header_type)
480 continue; /* don't change it if session stop/restart */
481 if (chan_priv->free_event_id < 31)
482 chan_priv->header_type = 1; /* compact */
c099397a 483 else
f7d06400 484 chan_priv->header_type = 2; /* large */
c099397a
MD		 485 }
486
64af2437 487 /* Clear each stream's quiescent state. */
f7d06400
MD		 488 list_for_each_entry(chan_priv, &session->priv->chan, node) {
489 if (chan_priv->channel_type != METADATA_CHANNEL)
490 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 491 }
64af2437 492
a8f2d0c7 493 WRITE_ONCE(session->active, 1);
8cdc1a81 494 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 495 ret = _lttng_session_metadata_statedump(session);
c337ddc2 496 if (ret) {
a8f2d0c7 497 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 498 goto end;
499 }
500 ret = lttng_statedump_start(session);
360f38ea 501 if (ret)
a8f2d0c7 502 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 503end:
504 mutex_unlock(&sessions_mutex);
11b5a3c2 505 return ret;
c0e31d2e
MD		 506}
507
8cdc1a81 508int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 509{
510 int ret = 0;
f7d06400 511 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 512
513 mutex_lock(&sessions_mutex);
514 if (!session->active) {
515 ret = -EBUSY;
516 goto end;
517 }
a8f2d0c7 518 WRITE_ONCE(session->active, 0);
3c997079
MD		 519
520 /* Set transient enabler state to "disabled" */
8cdc1a81 521 session->priv->tstate = 0;
b2bc0bc8 522 lttng_session_sync_event_enablers(session);
64af2437
MD		 523
524 /* Set each stream's quiescent state. */
f7d06400
MD		 525 list_for_each_entry(chan_priv, &session->priv->chan, node) {
526 if (chan_priv->channel_type != METADATA_CHANNEL)
527 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 528 }
c0e31d2e
MD		 529end:
530 mutex_unlock(&sessions_mutex);
11b5a3c2 531 return ret;
c0e31d2e
MD		 532}
533
8cdc1a81 534int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 535{
536 int ret = 0;
f7d06400 537 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 538 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 539 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 540 struct lttng_metadata_stream *stream;
541
542 mutex_lock(&sessions_mutex);
543 if (!session->active) {
544 ret = -EBUSY;
545 goto end;
546 }
547
548 mutex_lock(&cache->lock);
549 memset(cache->data, 0, cache->cache_alloc);
550 cache->metadata_written = 0;
551 cache->version++;
8cdc1a81 552 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 553 stream->metadata_out = 0;
554 stream->metadata_in = 0;
555 }
556 mutex_unlock(&cache->lock);
557
8cdc1a81 558 session->priv->metadata_dumped = 0;
f7d06400
MD		 559 list_for_each_entry(chan_priv, &session->priv->chan, node) {
560 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 561 }
562
f237aef8 563 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386 564 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 565 }
566
567 ret = _lttng_session_metadata_statedump(session);
568
569end:
570 mutex_unlock(&sessions_mutex);
571 return ret;
572}
573
6b757027
MD		 574static
575bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
576{
577 struct lttng_kernel_channel_buffer *chan_buf;
578
579 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
580 return false;
581 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
582 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
583 return true;
584 return false;
585}
586
587int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
e64957da 588{
3c997079 589 int ret = 0;
e64957da 590
3c997079 591 mutex_lock(&sessions_mutex);
6b757027 592 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 593 ret = -EPERM;
594 goto end;
595 }
6b757027 596 if (channel->enabled) {
3c997079
MD		 597 ret = -EEXIST;
598 goto end;
599 }
600 /* Set transient enabler state to "enabled" */
6b757027
MD		 601 channel->priv->tstate = 1;
602 lttng_session_sync_event_enablers(channel->session);
3c997079 603 /* Set atomically the state to "enabled" */
6b757027 604 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 605end:
606 mutex_unlock(&sessions_mutex);
607 return ret;
e64957da
MD		 608}
609
6b757027 610int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
e64957da 611{
3c997079 612 int ret = 0;
e64957da 613
3c997079 614 mutex_lock(&sessions_mutex);
6b757027 615 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 616 ret = -EPERM;
617 goto end;
618 }
6b757027 619 if (!channel->enabled) {
3c997079
MD		 620 ret = -EEXIST;
621 goto end;
622 }
623 /* Set atomically the state to "disabled" */
6b757027 624 WRITE_ONCE(channel->enabled, 0);
3c997079 625 /* Set transient enabler state to "enabled" */
6b757027
MD		 626 channel->priv->tstate = 0;
627 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 628end:
629 mutex_unlock(&sessions_mutex);
630 return ret;
e64957da
MD		 631}
632
9d993668 633int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 634{
3c997079 635 int ret = 0;
e64957da 636
3c997079 637 mutex_lock(&sessions_mutex);
9d993668
MD		 638 switch (event->type) {
639 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
640 {
641 struct lttng_kernel_event_recorder *event_recorder =
642 container_of(event, struct lttng_kernel_event_recorder, parent);
643
f7d06400 644 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 645 ret = -EPERM;
646 goto end;
647 }
a0493bef 648 break;
9d993668
MD		 649 }
650 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
651 switch (event->priv->instrumentation) {
652 case LTTNG_KERNEL_ABI_KRETPROBE:
653 ret = -EINVAL;
654 goto end;
655 default:
656 break;
657 }
a0493bef
MD		 658 break;
659 default:
9d993668 660 break;
a0493bef 661 }
e64957da 662
9d993668 663 if (event->enabled) {
3c997079
MD		 664 ret = -EEXIST;
665 goto end;
666 }
a67ba386 667 switch (event->priv->instrumentation) {
c190d76e
MJ		 668 case LTTNG_KERNEL_ABI_TRACEPOINT:
669 lttng_fallthrough;
606828e4 670 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 671 ret = -EINVAL;
672 break;
b4a75708 673
c190d76e
MJ		 674 case LTTNG_KERNEL_ABI_KPROBE:
675 lttng_fallthrough;
606828e4 676 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 677 WRITE_ONCE(event->enabled, 1);
a0493bef 678 break;
b4a75708 679
606828e4 680 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 681 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 682 break;
b4a75708 683
c190d76e
MJ		 684 case LTTNG_KERNEL_ABI_FUNCTION:
685 lttng_fallthrough;
686 case LTTNG_KERNEL_ABI_NOOP:
687 lttng_fallthrough;
a0493bef
MD		 688 default:
689 WARN_ON_ONCE(1);
690 ret = -EINVAL;
691 }
3c997079
MD		 692end:
693 mutex_unlock(&sessions_mutex);
694 return ret;
e64957da
MD		 695}
696
9d993668 697int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 698{
699 int ret = 0;
700
701 mutex_lock(&sessions_mutex);
9d993668
MD		 702 switch (event->type) {
703 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
704 {
705 struct lttng_kernel_event_recorder *event_recorder =
706 container_of(event, struct lttng_kernel_event_recorder, parent);
707
f7d06400 708 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 709 ret = -EPERM;
710 goto end;
711 }
b01155ba 712 break;
9d993668
MD		 713 }
714 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
715 switch (event->priv->instrumentation) {
716 case LTTNG_KERNEL_ABI_KRETPROBE:
717 ret = -EINVAL;
718 goto end;
719 default:
720 break;
721 }
2b16f0c9 722 break;
dffef45d 723 default:
9d993668 724 break;
dffef45d 725 }
dffef45d 726
a67ba386 727 if (!event->enabled) {
dffef45d
FD		 728 ret = -EEXIST;
729 goto end;
730 }
a67ba386 731 switch (event->priv->instrumentation) {
c190d76e
MJ		 732 case LTTNG_KERNEL_ABI_TRACEPOINT:
733 lttng_fallthrough;
606828e4 734 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 735 ret = -EINVAL;
736 break;
b4a75708 737
c190d76e
MJ		 738 case LTTNG_KERNEL_ABI_KPROBE:
739 lttng_fallthrough;
606828e4 740 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 741 WRITE_ONCE(event->enabled, 0);
2b16f0c9 742 break;
b4a75708 743
9d993668
MD		 744 case LTTNG_KERNEL_ABI_KRETPROBE:
745 ret = lttng_kretprobes_event_enable_state(event, 0);
746 break;
747
c190d76e
MJ		 748 case LTTNG_KERNEL_ABI_FUNCTION:
749 lttng_fallthrough;
750 case LTTNG_KERNEL_ABI_NOOP:
751 lttng_fallthrough;
dffef45d
FD		 752 default:
753 WARN_ON_ONCE(1);
754 ret = -EINVAL;
755 }
756end:
757 mutex_unlock(&sessions_mutex);
758 return ret;
759}
760
4e252d1e 761struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 762 const char *transport_name,
763 void *buf_addr,
4e3c1b9b
MD		 764 size_t subbuf_size, size_t num_subbuf,
765 unsigned int switch_timer_interval,
d83004aa
JD		 766 unsigned int read_timer_interval,
767 enum channel_type channel_type)
4e3c1b9b 768{
f7d06400
MD		 769 struct lttng_kernel_channel_buffer *chan;
770 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 771 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 772
773 mutex_lock(&sessions_mutex);
8cdc1a81 774 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 775 goto active; /* Refuse to add channel to active session */
a90917c3 776 transport = lttng_transport_find(transport_name);
f3d01b96 777 if (!transport) {
5a15f70c 778 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 779 transport_name);
c0e31d2e 780 goto notransport;
f3d01b96 781 }
a33c9927 782 if (!try_module_get(transport->owner)) {
5a15f70c 783 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 784 goto notransport;
785 }
f7d06400 786 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 787 if (!chan)
c0e31d2e 788 goto nomem;
f7d06400
MD		 789 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
790 if (!chan_priv)
791 goto nomem_priv;
792 chan->priv = chan_priv;
793 chan_priv->pub = chan;
794 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
795 chan->parent.session = session;
796 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 797 chan->ops = &transport->ops;
125b4df4
MD		 798 /*
799 * Note: the channel creation op already writes into the packet
800 * headers. Therefore the "chan" information used as input
801 * should be already accessible.
802 */
f7d06400 803 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 804 chan, buf_addr, subbuf_size, num_subbuf,
805 switch_timer_interval, read_timer_interval);
f7d06400 806 if (!chan->priv->rb_chan)
f3d01b96 807 goto create_error;
f7d06400
MD		 808 chan->priv->parent.tstate = 1;
809 chan->parent.enabled = 1;
810 chan->priv->transport = transport;
811 chan->priv->channel_type = channel_type;
812 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 813 mutex_unlock(&sessions_mutex);
814 return chan;
815
f3d01b96 816create_error:
f7d06400
MD		 817 kfree(chan_priv);
818nomem_priv:
f3d01b96 819 kfree(chan);
c0e31d2e 820nomem:
a33c9927
MD		 821 if (transport)
822 module_put(transport->owner);
c0e31d2e 823notransport:
e5382b6d 824active:
4e3c1b9b
MD		 825 mutex_unlock(&sessions_mutex);
826 return NULL;
827}
828
829/*
d83004aa
JD		 830 * Only used internally at session destruction for per-cpu channels, and
831 * when metadata channel is released.
832 * Needs to be called with sessions mutex held.
4e3c1b9b 833 */
aa7c23a9 834static
f7d06400 835void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 836{
f7d06400
MD		 837 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
838 module_put(chan->priv->transport->owner);
839 list_del(&chan->priv->node);
840 lttng_kernel_destroy_context(chan->priv->ctx);
841 kfree(chan->priv);
4e3c1b9b
MD		 842 kfree(chan);
843}
844
f7d06400 845void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 846{
f7d06400 847 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 848
849 /* Protect the metadata cache with the sessions_mutex. */
850 mutex_lock(&sessions_mutex);
851 _lttng_channel_destroy(chan);
852 mutex_unlock(&sessions_mutex);
853}
854EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
855
856static
857void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
858{
859 stream->finalized = 1;
860 wake_up_interruptible(&stream->read_wait);
861}
862
51d248b5
MD		 863static
864bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler)
865{
866 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
867 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
868
869 switch (event_enabler->enabler_type) {
870 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
871 {
872 struct lttng_event_recorder_enabler *event_recorder_enabler =
873 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
874 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
875
876 switch (itype) {
877 case LTTNG_KERNEL_ABI_TRACEPOINT:
878 lttng_fallthrough;
879 case LTTNG_KERNEL_ABI_KPROBE:
880 lttng_fallthrough;
881 case LTTNG_KERNEL_ABI_SYSCALL:
882 lttng_fallthrough;
883 case LTTNG_KERNEL_ABI_UPROBE:
884 if (chan->priv->free_event_id == -1U)
885 return false;
886 return true;
887 case LTTNG_KERNEL_ABI_KRETPROBE:
888 /* kretprobes require 2 event IDs. */
889 if (chan->priv->free_event_id >= -2U)
890 return false;
891 return true;
892 default:
893 WARN_ON_ONCE(1);
894 return false;
895 }
896 }
897 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
898 return true;
899 default:
900 WARN_ON_ONCE(1);
901 return false;
902 }
903}
904
756a020c
MD		 905static
906struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler)
907{
908 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
909 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
910
911 switch (event_enabler->enabler_type) {
912 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
913 {
914 struct lttng_event_recorder_enabler *event_recorder_enabler =
915 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
916 struct lttng_kernel_event_recorder *event_recorder;
917 struct lttng_kernel_event_recorder_private *event_recorder_priv;
918 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
919
920 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
921 if (!event_recorder)
922 return NULL;
923 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
924 if (!event_recorder_priv) {
925 kmem_cache_free(event_recorder_private_cache, event_recorder);
926 return NULL;
927 }
928 event_recorder_priv->pub = event_recorder;
929 event_recorder_priv->parent.pub = &event_recorder->parent;
930 event_recorder->priv = event_recorder_priv;
931 event_recorder->parent.priv = &event_recorder_priv->parent;
932
933 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
934 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
935 event_recorder->priv->parent.instrumentation = itype;
936 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
937 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
938
939 event_recorder->chan = chan;
940 event_recorder->priv->id = chan->priv->free_event_id++;
941 return &event_recorder->parent;
942 }
943 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
944 {
945 struct lttng_event_notifier_enabler *event_notifier_enabler =
946 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
947 struct lttng_kernel_event_notifier *event_notifier;
948 struct lttng_kernel_event_notifier_private *event_notifier_priv;
949
950 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
951 if (!event_notifier)
952 return NULL;
953 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
954 if (!event_notifier_priv) {
955 kmem_cache_free(event_notifier_private_cache, event_notifier);
956 return NULL;
957 }
958 event_notifier_priv->pub = event_notifier;
959 event_notifier_priv->parent.pub = &event_notifier->parent;
960 event_notifier->priv = event_notifier_priv;
961 event_notifier->parent.priv = &event_notifier_priv->parent;
962
963 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
964 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
965 event_notifier->priv->parent.instrumentation = itype;
966 event_notifier->priv->parent.user_token = event_enabler->user_token;
967 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
968 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
969
970 event_notifier->priv->group = event_notifier_enabler->group;
971 event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index;
972 event_notifier->priv->num_captures = 0;
973 event_notifier->notification_send = lttng_event_notifier_notification_send;
974 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
975 return &event_notifier->parent;
976 }
977 default:
978 return NULL;
979 }
980}
981
982static
983void lttng_kernel_event_free(struct lttng_kernel_event_common *event)
984{
985 switch (event->type) {
986 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
987 {
988 struct lttng_kernel_event_recorder *event_recorder =
989 container_of(event, struct lttng_kernel_event_recorder, parent);
990
991 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
992 kmem_cache_free(event_recorder_cache, event_recorder);
993 break;
994 }
995 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
996 {
997 struct lttng_kernel_event_notifier *event_notifier =
998 container_of(event, struct lttng_kernel_event_notifier, parent);
999
1000 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1001 kmem_cache_free(event_notifier_cache, event_notifier);
1002 break;
1003 }
1004 default:
1005 WARN_ON_ONCE(1);
1006 }
1007}
a101fa10 1008
ccefc7ab
MD		 1009static
1010int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event)
1011{
1012 switch (event->type) {
1013 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1014 return 0;
1015 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1016 {
1017 struct lttng_kernel_event_notifier *event_notifier =
1018 container_of(event, struct lttng_kernel_event_notifier, parent);
1019 struct lttng_counter *error_counter;
1020 struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group;
1021 size_t dimension_index[1];
1022 int ret;
1023
1024 /*
1025 * Clear the error counter bucket. The sessiond keeps track of which
1026 * bucket is currently in use. We trust it. The session lock
1027 * synchronizes against concurrent creation of the error
1028 * counter.
1029 */
1030 error_counter = event_notifier_group->error_counter;
1031 if (!error_counter)
1032 return 0;
1033 /*
1034 * Check that the index is within the boundary of the counter.
1035 */
1036 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
1037 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1038 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1039 return -EINVAL;
1040 }
1041
1042 dimension_index[0] = event_notifier->priv->error_counter_index;
1043 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1044 if (ret) {
1045 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1046 event_notifier->priv->error_counter_index);
1047 return -EINVAL;
1048 }
1049 return 0;
1050 }
1051 default:
1052 return -EINVAL;
1053 }
1054}
1055
e5382b6d
MD		 1056/*
1057 * Supports event creation while tracing session is active.
3c997079 1058 * Needs to be called with sessions mutex held.
e5382b6d 1059 */
13a2dfca 1060struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
def1e304 1061 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 1062{
13a2dfca
MD		 1063 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
1064 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
1065 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
def1e304 1066 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1067 struct lttng_kernel_event_common_private *event_priv;
756a020c 1068 struct lttng_kernel_event_common *event;
3c997079
MD		 1069 const char *event_name;
1070 struct hlist_head *head;
3d084699 1071 int ret;
4e3c1b9b 1072
13a2dfca 1073 if (!lttng_kernel_event_id_available(event_enabler)) {
4cf0bf51 1074 ret = -EMFILE;
e5382b6d 1075 goto full;
abc0446a 1076 }
3c997079
MD		 1077
1078 switch (itype) {
606828e4 1079 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1080 event_name = event_desc->event_name;
3c997079 1081 break;
b4a75708 1082
c190d76e
MJ		 1083 case LTTNG_KERNEL_ABI_KPROBE:
1084 lttng_fallthrough;
1085 case LTTNG_KERNEL_ABI_UPROBE:
1086 lttng_fallthrough;
1087 case LTTNG_KERNEL_ABI_KRETPROBE:
1088 lttng_fallthrough;
606828e4 1089 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 1090 event_name = event_param->name;
1091 break;
b4a75708 1092
c190d76e
MJ		 1093 case LTTNG_KERNEL_ABI_FUNCTION:
1094 lttng_fallthrough;
1095 case LTTNG_KERNEL_ABI_NOOP:
1096 lttng_fallthrough;
3c997079
MD		 1097 default:
1098 WARN_ON_ONCE(1);
1099 ret = -EINVAL;
1100 goto type_error;
1101 }
4a11ef1c 1102
0def9170 1103 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1104 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
13a2dfca 1105 if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) {
3c997079
MD		 1106 ret = -EEXIST;
1107 goto exist;
abc0446a
MD		 1108 }
1109 }
3c997079 1110
13a2dfca 1111 event = lttng_kernel_event_alloc(event_enabler);
756a020c 1112 if (!event) {
4cf0bf51 1113 ret = -ENOMEM;
756a020c 1114 goto alloc_error;
abc0446a 1115 }
3c997079
MD		 1116
1117 switch (itype) {
606828e4 1118 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 1119 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1120 event->enabled = 0;
1121 event->priv->registered = 0;
1122 event->priv->desc = lttng_event_desc_get(event_name);
1123 if (!event->priv->desc) {
4cf0bf51 1124 ret = -ENOENT;
d3dbe23c 1125 goto register_error;
abc0446a 1126 }
3c997079
MD		 1127 /* Populate lttng_event structure before event registration. */
1128 smp_wmb();
baf20995 1129 break;
b4a75708 1130
606828e4 1131 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 1132 /*
1133 * Needs to be explicitly enabled after creation, since
1134 * we may want to apply filters.
1135 */
7cd0f696
MD		 1136 event->enabled = 0;
1137 event->priv->registered = 1;
3c997079
MD		 1138 /*
1139 * Populate lttng_event structure before event
1140 * registration.
1141 */
1142 smp_wmb();
8bf17deb 1143 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 1144 event_param->u.kprobe.symbol_name,
1145 event_param->u.kprobe.offset,
1146 event_param->u.kprobe.addr,
7cd0f696 1147 event);
abc0446a 1148 if (ret) {
4cf0bf51 1149 ret = -EINVAL;
d6d808f3 1150 goto register_error;
abc0446a 1151 }
7cd0f696 1152 ret = try_module_get(event->priv->desc->owner);
edeb3137 1153 WARN_ON_ONCE(!ret);
d6d808f3 1154 break;
b4a75708 1155
606828e4 1156 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 1157 {
756a020c 1158 struct lttng_kernel_event_common *event_return;
7371f44c
MD		 1159
1160 /* kretprobe defines 2 events */
a0493bef
MD		 1161 /*
1162 * Needs to be explicitly enabled after creation, since
1163 * we may want to apply filters.
1164 */
756a020c
MD		 1165 event->enabled = 0;
1166 event->priv->registered = 1;
a67ba386 1167
13a2dfca 1168 event_return = lttng_kernel_event_alloc(event_enabler);
756a020c 1169 if (!event) {
a67ba386 1170 ret = -ENOMEM;
756a020c 1171 goto alloc_error;
a67ba386 1172 }
756a020c
MD		 1173
1174 event_return->enabled = 0;
1175 event_return->priv->registered = 1;
1176
7371f44c 1177 /*
a90917c3 1178 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1179 */
1180 smp_wmb();
3c997079 1181 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1182 event_param->u.kretprobe.symbol_name,
1183 event_param->u.kretprobe.offset,
1184 event_param->u.kretprobe.addr,
756a020c 1185 event, event_return);
7371f44c 1186 if (ret) {
756a020c 1187 lttng_kernel_event_free(event_return);
4cf0bf51 1188 ret = -EINVAL;
7371f44c
MD		 1189 goto register_error;
1190 }
1191 /* Take 2 refs on the module: one per event. */
756a020c 1192 ret = try_module_get(event->priv->desc->owner);
7371f44c 1193 WARN_ON_ONCE(!ret);
756a020c 1194 ret = try_module_get(event_return->priv->desc->owner);
7371f44c 1195 WARN_ON_ONCE(!ret);
ee7e9a18 1196 ret = _lttng_event_recorder_metadata_statedump(event_return);
abc0446a 1197 WARN_ON_ONCE(ret > 0);
7371f44c 1198 if (ret) {
756a020c 1199 lttng_kernel_event_free(event_return);
7cd0f696
MD		 1200 module_put(event_return->priv->desc->owner);
1201 module_put(event->priv->desc->owner);
7371f44c
MD		 1202 goto statedump_error;
1203 }
19b98250 1204 list_add(&event_return->priv->node, event_list_head);
7371f44c
MD		 1205 break;
1206 }
b4a75708 1207
606828e4 1208 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1209 /*
1210 * Needs to be explicitly enabled after creation, since
1211 * we may want to apply filters.
1212 */
7cd0f696
MD		 1213 event->enabled = 0;
1214 event->priv->registered = 0;
1215 event->priv->desc = event_desc;
badfe9f5 1216 switch (event_param->u.syscall.entryexit) {
606828e4 1217 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1218 ret = -EINVAL;
1219 goto register_error;
606828e4 1220 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1221 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1222 break;
606828e4 1223 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1224 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1225 break;
1226 }
1227 switch (event_param->u.syscall.abi) {
606828e4 1228 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1229 ret = -EINVAL;
1230 goto register_error;
606828e4 1231 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1232 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1233 break;
606828e4 1234 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1235 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1236 break;
1237 }
7cd0f696 1238 if (!event->priv->desc) {
4cf0bf51 1239 ret = -EINVAL;
259b6cb3 1240 goto register_error;
abc0446a 1241 }
1ec65de1 1242 break;
b4a75708 1243
606828e4 1244 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1245 /*
1246 * Needs to be explicitly enabled after creation, since
1247 * we may want to apply filters.
1248 */
7cd0f696
MD		 1249 event->enabled = 0;
1250 event->priv->registered = 1;
3aed4dca 1251
a344f64b
FD		 1252 /*
1253 * Populate lttng_event structure before event
1254 * registration.
1255 */
1256 smp_wmb();
149b9a9d 1257
83b802dc 1258 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1259 event_param->u.uprobe.fd,
7cd0f696 1260 event);
149b9a9d
YB		 1261 if (ret)
1262 goto register_error;
7cd0f696 1263 ret = try_module_get(event->priv->desc->owner);
149b9a9d
YB		 1264 WARN_ON_ONCE(!ret);
1265 break;
b4a75708 1266
c190d76e
MJ		 1267 case LTTNG_KERNEL_ABI_FUNCTION:
1268 lttng_fallthrough;
1269 case LTTNG_KERNEL_ABI_NOOP:
1270 lttng_fallthrough;
baf20995
MD		 1271 default:
1272 WARN_ON_ONCE(1);
4cf0bf51 1273 ret = -EINVAL;
df07930b 1274 goto register_error;
baf20995 1275 }
13a2dfca 1276
ee7e9a18 1277 ret = _lttng_event_recorder_metadata_statedump(event);
abc0446a
MD		 1278 WARN_ON_ONCE(ret > 0);
1279 if (ret) {
c099397a 1280 goto statedump_error;
abc0446a 1281 }
dffef45d 1282
ccefc7ab
MD		 1283 ret = lttng_kernel_event_notifier_clear_error_counter(event);
1284 if (ret)
1285 goto register_error;
c4e31059 1286
c4e31059 1287 hlist_add_head(&event->priv->hlist_node, head);
13a2dfca 1288 list_add(&event->priv->node, event_list_head);
c4e31059 1289
13a2dfca 1290 return event;
dffef45d 1291
13a2dfca
MD		 1292statedump_error:
1293 /* If a statedump error occurs, events will not be readable. */
dffef45d 1294register_error:
756a020c
MD		 1295 lttng_kernel_event_free(event);
1296alloc_error:
dffef45d
FD		 1297exist:
1298type_error:
13a2dfca 1299full:
dffef45d
FD		 1300 return ERR_PTR(ret);
1301}
1302
83006ee0
MD		 1303struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1304 const struct lttng_kernel_event_desc *event_desc)
1305{
1306 struct lttng_kernel_event_common *event;
1307
1308 mutex_lock(&sessions_mutex);
1309 event = _lttng_kernel_event_create(event_enabler, event_desc);
1310 mutex_unlock(&sessions_mutex);
1311 return event;
1312}
1313
99f52fcc
FD		 1314int lttng_kernel_counter_read(struct lttng_counter *counter,
1315 const size_t *dim_indexes, int32_t cpu,
1316 int64_t *val, bool *overflow, bool *underflow)
1317{
1318 return counter->ops->counter_read(counter->counter, dim_indexes,
1319 cpu, val, overflow, underflow);
1320}
1321
1322int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1323 const size_t *dim_indexes, int64_t *val,
1324 bool *overflow, bool *underflow)
1325{
1326 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1327 val, overflow, underflow);
1328}
1329
1330int lttng_kernel_counter_clear(struct lttng_counter *counter,
1331 const size_t *dim_indexes)
1332{
1333 return counter->ops->counter_clear(counter->counter, dim_indexes);
1334}
1335
6a338ba4 1336/* Only used for tracepoints and system calls for now. */
3c997079 1337static
0c851fa0 1338void register_event(struct lttng_kernel_event_common *event)
3c997079 1339{
437d5aa5 1340 const struct lttng_kernel_event_desc *desc;
f127e61e 1341 int ret = -EINVAL;
3c997079 1342
6a338ba4 1343 WARN_ON_ONCE(event->priv->registered);
4ecb5ad5 1344
0c851fa0
MD		 1345 desc = event->priv->desc;
1346 switch (event->priv->instrumentation) {
606828e4 1347 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1348 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1349 desc->tp_class->probe_callback,
0c851fa0 1350 event);
4ecb5ad5 1351 break;
b4a75708 1352
606828e4 1353 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1354 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1355 break;
b4a75708 1356
c190d76e
MJ		 1357 case LTTNG_KERNEL_ABI_KPROBE:
1358 lttng_fallthrough;
1359 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1360 ret = 0;
f0bcc14c 1361 break;
0c851fa0
MD		 1362
1363 case LTTNG_KERNEL_ABI_KRETPROBE:
1364 switch (event->type) {
1365 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1366 ret = 0;
1367 break;
1368 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1369 WARN_ON_ONCE(1);
1370 break;
1371 }
4ecb5ad5 1372 break;
b4a75708 1373
c190d76e
MJ		 1374 case LTTNG_KERNEL_ABI_FUNCTION:
1375 lttng_fallthrough;
1376 case LTTNG_KERNEL_ABI_NOOP:
1377 lttng_fallthrough;
4ecb5ad5
MD		 1378 default:
1379 WARN_ON_ONCE(1);
1380 }
6a338ba4 1381 WARN_ON_ONCE(ret);
3c997079 1382 if (!ret)
0c851fa0 1383 event->priv->registered = 1;
3c997079
MD		 1384}
1385
6a338ba4
MD		 1386static
1387void unregister_event(struct lttng_kernel_event_common *event)
4e3c1b9b 1388{
f0bcc14c 1389 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1390 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1391 int ret = -EINVAL;
1392
6a338ba4 1393 WARN_ON_ONCE(!event->priv->registered);
3c997079 1394
a67ba386
MD		 1395 desc = event_priv->desc;
1396 switch (event_priv->instrumentation) {
606828e4 1397 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1398 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1399 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1400 event);
baf20995 1401 break;
b4a75708 1402
606828e4 1403 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1404 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1405 ret = 0;
1406 break;
b4a75708 1407
606828e4 1408 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1409 switch (event->type) {
1410 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1411 lttng_kretprobes_unregister(event);
1412 ret = 0;
1413 break;
1414 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1415 WARN_ON_ONCE(1);
1416 break;
1417 }
7371f44c 1418 break;
b4a75708 1419
606828e4 1420 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1421 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1422 break;
b4a75708 1423
606828e4 1424 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1425 switch (event->type) {
1426 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1427 ret = 0;
1428 break;
1429 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1430 WARN_ON_ONCE(1);
1431 break;
1432 }
259b6cb3 1433 break;
b4a75708 1434
606828e4 1435 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1436 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1437 ret = 0;
1438 break;
b4a75708 1439
c190d76e
MJ		 1440 case LTTNG_KERNEL_ABI_FUNCTION:
1441 lttng_fallthrough;
baf20995
MD		 1442 default:
1443 WARN_ON_ONCE(1);
1444 }
6a338ba4 1445 WARN_ON_ONCE(ret);
3c997079 1446 if (!ret)
a67ba386 1447 event_priv->registered = 0;
6a338ba4
MD		 1448}
1449
1450static
1451void _lttng_event_unregister(struct lttng_kernel_event_common *event)
1452{
1453 if (event->priv->registered)
1454 unregister_event(event);
dda6a249
MD		 1455}
1456
1457/*
1458 * Only used internally at session destruction.
1459 */
be066e6c 1460static
0648898e 1461void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1462{
0648898e 1463 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1464 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1465
0648898e
MD		 1466 lttng_free_event_filter_runtime(event);
1467 /* Free event enabler refs */
1468 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1469 &event_priv->enablers_ref_head, node)
1470 kfree(enabler_ref);
b4a75708 1471
0648898e
MD		 1472 switch (event->type) {
1473 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1474 {
1475 struct lttng_kernel_event_recorder *event_recorder =
1476 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1477
0648898e
MD		 1478 switch (event_priv->instrumentation) {
1479 case LTTNG_KERNEL_ABI_TRACEPOINT:
1480 lttng_event_desc_put(event_priv->desc);
1481 break;
b4a75708 1482
0648898e
MD		 1483 case LTTNG_KERNEL_ABI_KPROBE:
1484 module_put(event_priv->desc->owner);
6a35e5bd 1485 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1486 break;
b4a75708 1487
0648898e
MD		 1488 case LTTNG_KERNEL_ABI_KRETPROBE:
1489 module_put(event_priv->desc->owner);
eb6b47db 1490 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1491 break;
b4a75708 1492
0648898e
MD		 1493 case LTTNG_KERNEL_ABI_SYSCALL:
1494 break;
4e3c1b9b 1495
0648898e
MD		 1496 case LTTNG_KERNEL_ABI_UPROBE:
1497 module_put(event_priv->desc->owner);
17806c46 1498 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1499 break;
3ef5cc03 1500
c190d76e
MJ		 1501 case LTTNG_KERNEL_ABI_FUNCTION:
1502 lttng_fallthrough;
1503 case LTTNG_KERNEL_ABI_NOOP:
1504 lttng_fallthrough;
0648898e
MD		 1505 default:
1506 WARN_ON_ONCE(1);
1507 }
f237aef8 1508 list_del(&event_recorder->priv->parent.node);
0648898e
MD		 1509 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1510 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1511 break;
0648898e
MD		 1512 }
1513 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1514 {
1515 struct lttng_kernel_event_notifier *event_notifier =
1516 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1517
0648898e
MD		 1518 switch (event_notifier->priv->parent.instrumentation) {
1519 case LTTNG_KERNEL_ABI_TRACEPOINT:
1520 lttng_event_desc_put(event_notifier->priv->parent.desc);
1521 break;
b4a75708 1522
0648898e
MD		 1523 case LTTNG_KERNEL_ABI_KPROBE:
1524 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1525 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1526 break;
b4a75708 1527
0648898e
MD		 1528 case LTTNG_KERNEL_ABI_SYSCALL:
1529 break;
b4a75708 1530
0648898e
MD		 1531 case LTTNG_KERNEL_ABI_UPROBE:
1532 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1533 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1534 break;
1535
c190d76e
MJ		 1536 case LTTNG_KERNEL_ABI_KRETPROBE:
1537 lttng_fallthrough;
1538 case LTTNG_KERNEL_ABI_FUNCTION:
1539 lttng_fallthrough;
1540 case LTTNG_KERNEL_ABI_NOOP:
1541 lttng_fallthrough;
0648898e
MD		 1542 default:
1543 WARN_ON_ONCE(1);
1544 }
f237aef8 1545 list_del(&event_notifier->priv->parent.node);
0648898e
MD		 1546 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1547 kmem_cache_free(event_notifier_cache, event_notifier);
1548 break;
1549 }
dffef45d
FD		 1550 default:
1551 WARN_ON_ONCE(1);
1552 }
dffef45d
FD		 1553}
1554
8c0393c3 1555struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1556 enum tracker_type tracker_type)
e0130fab 1557{
d1f652f8
MD		 1558 switch (tracker_type) {
1559 case TRACKER_PID:
1560 return &session->pid_tracker;
1561 case TRACKER_VPID:
1562 return &session->vpid_tracker;
1563 case TRACKER_UID:
1564 return &session->uid_tracker;
1565 case TRACKER_VUID:
1566 return &session->vuid_tracker;
1567 case TRACKER_GID:
1568 return &session->gid_tracker;
1569 case TRACKER_VGID:
1570 return &session->vgid_tracker;
1571 default:
1572 WARN_ON_ONCE(1);
1573 return NULL;
1574 }
1575}
1576
8cdc1a81 1577int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1578 enum tracker_type tracker_type, int id)
1579{
8c0393c3 1580 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1581 int ret;
1582
d1f652f8
MD		 1583 tracker = get_tracker(session, tracker_type);
1584 if (!tracker)
1585 return -EINVAL;
1586 if (id < -1)
e0130fab
MD		 1587 return -EINVAL;
1588 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1589 if (id == -1) {
1590 /* track all ids: destroy tracker. */
1591 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1592 ret = 0;
1593 } else {
d1f652f8 1594 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1595 }
e0130fab
MD		 1596 mutex_unlock(&sessions_mutex);
1597 return ret;
1598}
1599
8cdc1a81 1600int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1601 enum tracker_type tracker_type, int id)
e0130fab 1602{
8c0393c3 1603 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1604 int ret;
1605
d1f652f8
MD		 1606 tracker = get_tracker(session, tracker_type);
1607 if (!tracker)
1608 return -EINVAL;
1609 if (id < -1)
e0130fab
MD		 1610 return -EINVAL;
1611 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1612 if (id == -1) {
1613 /* untrack all ids: replace by empty tracker. */
1614 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1615 } else {
d1f652f8 1616 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1617 }
e0130fab
MD		 1618 mutex_unlock(&sessions_mutex);
1619 return ret;
1620}
1621
7e6f9ef6 1622static
d1f652f8 1623void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1624{
8c0393c3
MD		 1625 struct lttng_kernel_id_tracker *id_tracker = m->private;
1626 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1627 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1628 int iter = 0, i;
1629
1630 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1631 if (id_tracker_p) {
1632 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1633 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1634
f934e302 1635 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1636 if (iter++ >= *pos)
1637 return e;
1638 }
1639 }
1640 } else {
d1f652f8 1641 /* ID tracker disabled. */
7e6f9ef6 1642 if (iter >= *pos && iter == 0) {
d1f652f8 1643 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1644 }
1645 iter++;
1646 }
1647 /* End of list */
1648 return NULL;
1649}
1650
1651/* Called with sessions_mutex held. */
1652static
d1f652f8 1653void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1654{
8c0393c3
MD		 1655 struct lttng_kernel_id_tracker *id_tracker = m->private;
1656 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1657 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1658 int iter = 0, i;
1659
1660 (*ppos)++;
d1f652f8
MD		 1661 if (id_tracker_p) {
1662 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1663 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1664
f934e302 1665 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1666 if (iter++ >= *ppos)
1667 return e;
1668 }
1669 }
1670 } else {
d1f652f8 1671 /* ID tracker disabled. */
7e6f9ef6 1672 if (iter >= *ppos && iter == 0)
d1f652f8 1673 return p; /* empty tracker */
7e6f9ef6
MD		 1674 iter++;
1675 }
1676
1677 /* End of list */
1678 return NULL;
1679}
1680
1681static
d1f652f8 1682void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1683{
1684 mutex_unlock(&sessions_mutex);
1685}
1686
1687static
d1f652f8 1688int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1689{
8c0393c3
MD		 1690 struct lttng_kernel_id_tracker *id_tracker = m->private;
1691 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1692 int id;
7e6f9ef6 1693
d1f652f8 1694 if (p == id_tracker_p) {
7e6f9ef6 1695 /* Tracker disabled. */
d1f652f8 1696 id = -1;
7e6f9ef6 1697 } else {
d1f652f8 1698 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1699
d1f652f8
MD		 1700 id = lttng_id_tracker_get_node_id(e);
1701 }
8c0393c3 1702 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1703 case TRACKER_PID:
1704 seq_printf(m, "process { pid = %d; };\n", id);
1705 break;
1706 case TRACKER_VPID:
1707 seq_printf(m, "process { vpid = %d; };\n", id);
1708 break;
1709 case TRACKER_UID:
1710 seq_printf(m, "user { uid = %d; };\n", id);
1711 break;
1712 case TRACKER_VUID:
1713 seq_printf(m, "user { vuid = %d; };\n", id);
1714 break;
1715 case TRACKER_GID:
1716 seq_printf(m, "group { gid = %d; };\n", id);
1717 break;
1718 case TRACKER_VGID:
1719 seq_printf(m, "group { vgid = %d; };\n", id);
1720 break;
1721 default:
1722 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1723 }
7e6f9ef6
MD		 1724 return 0;
1725}
1726
1727static
d1f652f8
MD		 1728const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1729 .start = id_list_start,
1730 .next = id_list_next,
1731 .stop = id_list_stop,
1732 .show = id_list_show,
7e6f9ef6
MD		 1733};
1734
1735static
d1f652f8 1736int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1737{
d1f652f8 1738 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1739}
1740
1741static
d1f652f8 1742int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1743{
1744 struct seq_file *m = file->private_data;
8c0393c3 1745 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1746 int ret;
1747
d1f652f8 1748 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1749 ret = seq_release(inode, file);
d1f652f8 1750 if (!ret)
8c0393c3 1751 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1752 return ret;
1753}
1754
d1f652f8 1755const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1756 .owner = THIS_MODULE,
d1f652f8 1757 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1758 .read = seq_read,
1759 .llseek = seq_lseek,
d1f652f8 1760 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1761};
1762
8cdc1a81 1763int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1764 enum tracker_type tracker_type)
7e6f9ef6 1765{
d1f652f8 1766 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1767 struct seq_file *m;
1768 int file_fd, ret;
1769
1770 file_fd = lttng_get_unused_fd();
1771 if (file_fd < 0) {
1772 ret = file_fd;
1773 goto fd_error;
1774 }
1775
d1f652f8
MD		 1776 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1777 &lttng_tracker_ids_list_fops,
7e6f9ef6 1778 NULL, O_RDWR);
d1f652f8
MD		 1779 if (IS_ERR(tracker_ids_list_file)) {
1780 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1781 goto file_error;
1782 }
8cdc1a81 1783 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1784 ret = -EOVERFLOW;
9c1f4643
MD		 1785 goto refcount_error;
1786 }
d1f652f8 1787 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1788 if (ret < 0)
1789 goto open_error;
d1f652f8
MD		 1790 m = tracker_ids_list_file->private_data;
1791
1792 m->private = get_tracker(session, tracker_type);
1793 BUG_ON(!m->private);
1794 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1795
1796 return file_fd;
1797
1798open_error:
8cdc1a81 1799 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1800refcount_error:
d1f652f8 1801 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1802file_error:
1803 put_unused_fd(file_fd);
1804fd_error:
1805 return ret;
1806}
1807
3c997079
MD		 1808/*
1809 * Enabler management.
1810 */
1811static
4993071a
PP		 1812int lttng_match_enabler_star_glob(const char *desc_name,
1813 const char *pattern)
3c997079 1814{
cbc19040
MD		 1815 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1816 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1817 return 0;
1818 return 1;
1819}
1820
1821static
4ecb5ad5
MD		 1822int lttng_match_enabler_name(const char *desc_name,
1823 const char *name)
3c997079 1824{
4ecb5ad5 1825 if (strcmp(desc_name, name))
3c997079
MD		 1826 return 0;
1827 return 1;
1828}
1829
8bff0fc3
MD		 1830static
1831int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
8d554755 1832 struct lttng_event_enabler_common *enabler)
3c997079 1833{
4ecb5ad5 1834 const char *desc_name, *enabler_name;
badfe9f5 1835 bool compat = false, entry = false;
4ecb5ad5
MD		 1836
1837 enabler_name = enabler->event_param.name;
1838 switch (enabler->event_param.instrumentation) {
606828e4 1839 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1840 desc_name = desc->event_name;
3b861b22
FD		 1841 switch (enabler->format_type) {
1842 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1843 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1844 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1845 return lttng_match_enabler_name(desc_name, enabler_name);
1846 default:
1847 return -EINVAL;
1848 }
4ecb5ad5 1849 break;
b4a75708 1850
606828e4 1851 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1852 desc_name = desc->event_name;
badfe9f5 1853 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1854 desc_name += strlen("compat_");
badfe9f5
MD		 1855 compat = true;
1856 }
4ecb5ad5
MD		 1857 if (!strncmp(desc_name, "syscall_exit_",
1858 strlen("syscall_exit_"))) {
1859 desc_name += strlen("syscall_exit_");
1860 } else if (!strncmp(desc_name, "syscall_entry_",
1861 strlen("syscall_entry_"))) {
1862 desc_name += strlen("syscall_entry_");
badfe9f5 1863 entry = true;
4ecb5ad5
MD		 1864 } else {
1865 WARN_ON_ONCE(1);
1866 return -EINVAL;
1867 }
badfe9f5 1868 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1869 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1870 break;
606828e4 1871 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1872 if (!entry)
1873 return 0;
1874 break;
606828e4 1875 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1876 if (entry)
1877 return 0;
1878 break;
1879 default:
1880 return -EINVAL;
1881 }
1882 switch (enabler->event_param.u.syscall.abi) {
606828e4 1883 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1884 break;
606828e4 1885 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1886 if (compat)
1887 return 0;
1888 break;
606828e4 1889 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1890 if (!compat)
1891 return 0;
1892 break;
1893 default:
1894 return -EINVAL;
1895 }
1896 switch (enabler->event_param.u.syscall.match) {
606828e4 1897 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1898 switch (enabler->format_type) {
1899 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1900 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1901 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1902 return lttng_match_enabler_name(desc_name, enabler_name);
1903 default:
1904 return -EINVAL;
1905 }
1906 break;
606828e4 1907 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 1908 return -EINVAL; /* Not implemented. */
1909 default:
1910 return -EINVAL;
1911 }
4ecb5ad5 1912 break;
b4a75708 1913
4ecb5ad5
MD		 1914 default:
1915 WARN_ON_ONCE(1);
1916 return -EINVAL;
1917 }
3c997079
MD		 1918}
1919
8bff0fc3
MD		 1920bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
1921 struct lttng_event_enabler_common *enabler)
1922{
1923 int ret;
1924
1925 ret = lttng_desc_match_enabler_check(desc, enabler);
1926 if (ret < 0) {
1927 WARN_ON_ONCE(1);
1928 return false;
1929 }
1930 return ret;
1931}
1932
5c6ec66a
MD		 1933bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
1934 struct lttng_kernel_event_common *event)
3c997079 1935{
5c6ec66a
MD		 1936 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
1937 return false;
b2bc0bc8 1938
5c6ec66a
MD		 1939 switch (event_enabler->enabler_type) {
1940 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1941 {
1942 struct lttng_event_recorder_enabler *event_recorder_enabler =
1943 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1944 struct lttng_kernel_event_recorder *event_recorder =
1945 container_of(event, struct lttng_kernel_event_recorder, parent);
1946
1947 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
1948 && event_recorder->chan == event_recorder_enabler->chan)
1949 return true;
1950 else
1951 return false;
1952 }
1953 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1954 {
1955 struct lttng_event_notifier_enabler *event_notifier_enabler =
1956 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1957 struct lttng_kernel_event_notifier *event_notifier =
1958 container_of(event, struct lttng_kernel_event_notifier, parent);
1959
1960 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
1961 && event_notifier->priv->group == event_notifier_enabler->group
1962 && event->priv->user_token == event_enabler->user_token)
1963 return true;
1964 else
1965 return false;
1966 }
1967 default:
1968 WARN_ON_ONCE(1);
1969 return false;
1970 }
3c997079
MD		 1971}
1972
5c6ec66a
MD		 1973bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
1974 const struct lttng_kernel_event_desc *desc,
1975 struct lttng_kernel_event_common *event)
b01155ba 1976{
5c6ec66a
MD		 1977 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
1978 return false;
b01155ba 1979
5c6ec66a
MD		 1980 switch (event_enabler->enabler_type) {
1981 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1982 {
1983 struct lttng_event_recorder_enabler *event_recorder_enabler =
1984 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1985 struct lttng_kernel_event_recorder *event_recorder =
1986 container_of(event, struct lttng_kernel_event_recorder, parent);
1987
1988 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
1989 return true;
1990 else
1991 return false;
1992 }
1993 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1994 {
1995 struct lttng_event_notifier_enabler *event_notifier_enabler =
1996 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1997 struct lttng_kernel_event_notifier *event_notifier =
1998 container_of(event, struct lttng_kernel_event_notifier, parent);
1999
2000 if (event->priv->desc == desc
2001 && event_notifier->priv->group == event_notifier_enabler->group
2002 && event->priv->user_token == event_enabler->user_token)
2003 return true;
2004 else
2005 return false;
2006 }
2007 default:
2008 WARN_ON_ONCE(1);
2009 return false;
2010 }
b01155ba
FD		 2011}
2012
0d223dc6
MD		 2013bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler,
2014 const char *event_name,
2015 struct lttng_kernel_event_common *event)
2016{
2017 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2018 return false;
2019
2020 switch (event_enabler->enabler_type) {
2021 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2022 {
2023 struct lttng_event_recorder_enabler *event_recorder_enabler =
2024 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2025 struct lttng_kernel_event_recorder *event_recorder =
2026 container_of(event, struct lttng_kernel_event_recorder, parent);
2027
2028 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2029 && event_recorder->chan == event_recorder_enabler->chan)
2030 return true;
2031 else
2032 return false;
2033 }
2034 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2035 {
2036 struct lttng_event_notifier_enabler *event_notifier_enabler =
2037 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2038 struct lttng_kernel_event_notifier *event_notifier =
2039 container_of(event, struct lttng_kernel_event_notifier, parent);
2040
2041 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2042 && event_notifier->priv->group == event_notifier_enabler->group
2043 && event->priv->user_token == event_enabler->user_token)
2044 return true;
2045 else
2046 return false;
2047 }
2048 default:
2049 WARN_ON_ONCE(1);
2050 return false;
2051 }
2052}
2053
3c997079 2054static
b2bc0bc8
FD		 2055struct lttng_enabler_ref *lttng_enabler_ref(
2056 struct list_head *enablers_ref_list,
8d554755 2057 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2058{
2059 struct lttng_enabler_ref *enabler_ref;
2060
b2bc0bc8 2061 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2062 if (enabler_ref->ref == enabler)
2063 return enabler_ref;
2064 }
2065 return NULL;
2066}
2067
3c997079 2068static
b2f63bde 2069void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler)
3c997079 2070{
c8e14380 2071 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
437d5aa5
MD		 2072 struct lttng_kernel_probe_desc *probe_desc;
2073 const struct lttng_kernel_event_desc *desc;
3c997079 2074 struct list_head *probe_list;
c8e14380 2075 int i;
3c997079
MD		 2076
2077 probe_list = lttng_get_probe_list_head();
2078 /*
2079 * For each probe event, if we find that a probe event matches
2080 * our enabler, create an associated lttng_event if not
2081 * already present.
2082 */
2083 list_for_each_entry(probe_desc, probe_list, head) {
2084 for (i = 0; i < probe_desc->nr_events; i++) {
58969906 2085 bool found = false;
3c997079 2086 struct hlist_head *head;
83006ee0 2087 struct lttng_kernel_event_common *event;
19bef247 2088 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2089
2090 desc = probe_desc->event_desc[i];
c8e14380 2091 if (!lttng_desc_match_enabler(desc, event_enabler))
3c997079 2092 continue;
3c997079
MD		 2093
2094 /*
2095 * Check if already created.
2096 */
0def9170 2097 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2098 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
58969906
MD		 2099 if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) {
2100 found = true;
2101 break;
2102 }
3c997079
MD		 2103 }
2104 if (found)
2105 continue;
2106
2107 /*
83006ee0 2108 * We need to create an event for this event probe.
3c997079 2109 */
c8e14380 2110 event = _lttng_kernel_event_create(event_enabler, desc);
c3fb484e 2111 if (IS_ERR(event)) {
5a15f70c 2112 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2113 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2114 }
2115 }
2116 }
2117}
2118
33a39a3c 2119/*
8839618b 2120 * Create event if it is missing and present in the list of tracepoint probes.
33a39a3c
MD		 2121 * Should be called with sessions mutex held.
2122 */
2123static
b2f63bde 2124void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c 2125{
b2f63bde
MD		 2126 int ret;
2127
8839618b 2128 switch (event_enabler->event_param.instrumentation) {
606828e4 2129 case LTTNG_KERNEL_ABI_TRACEPOINT:
b2f63bde 2130 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler);
33a39a3c 2131 break;
b4a75708 2132
606828e4 2133 case LTTNG_KERNEL_ABI_SYSCALL:
b2f63bde
MD		 2134 ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler);
2135 WARN_ON_ONCE(ret);
33a39a3c 2136 break;
b4a75708 2137
33a39a3c
MD		 2138 default:
2139 WARN_ON_ONCE(1);
2140 break;
2141 }
2142}
2143
d619fae9
MD		 2144static
2145void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
2146 struct lttng_kernel_event_common *event)
2147{
2148 /* Link filter bytecodes if not linked yet. */
2149 lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx,
2150 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
2151}
2152
1e06b222
MD		 2153static
2154void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
2155 struct lttng_kernel_event_common *event)
2156{
2157 switch (event_enabler->enabler_type) {
2158 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2159 break;
2160 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2161 {
2162 struct lttng_event_notifier_enabler *event_notifier_enabler =
2163 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2164 struct lttng_kernel_event_notifier *event_notifier =
2165 container_of(event, struct lttng_kernel_event_notifier, parent);
2166
2167 /* Link capture bytecodes if not linked yet. */
2168 lttng_enabler_link_bytecode(event->priv->desc,
2169 lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head,
2170 &event_notifier_enabler->capture_bytecode_head);
2171 event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
2172 break;
2173 }
2174 default:
2175 WARN_ON_ONCE(1);
2176 }
2177}
2178
3c997079 2179/*
b2bc0bc8 2180 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2181 * and add backward reference from the event to the enabler.
2182 * Should be called with sessions mutex held.
2183 */
2184static
3622cd47 2185int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler)
3c997079 2186{
3622cd47
MD		 2187 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
2188 struct lttng_kernel_event_common_private *event_priv;
3c997079 2189
3622cd47 2190 lttng_syscall_table_set_wildcard_all(event_enabler);
badfe9f5 2191
3c997079 2192 /* First ensure that probe events are created for this enabler. */
b2f63bde 2193 lttng_event_enabler_create_events_if_missing(event_enabler);
3c997079 2194
3622cd47
MD		 2195 /* Link the created event with its associated enabler. */
2196 list_for_each_entry(event_priv, event_list_head, node) {
2197 struct lttng_kernel_event_common *event = event_priv->pub;
b01155ba
FD		 2198 struct lttng_enabler_ref *enabler_ref;
2199
3622cd47 2200 if (!lttng_event_enabler_match_event(event_enabler, event))
b01155ba
FD		 2201 continue;
2202
3622cd47 2203 enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler);
b01155ba
FD		 2204 if (!enabler_ref) {
2205 /*
2206 * If no backward ref, create it.
2207 * Add backward ref from event_notifier to enabler.
2208 */
2209 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2210 if (!enabler_ref)
2211 return -ENOMEM;
2212
3622cd47
MD		 2213 enabler_ref->ref = event_enabler;
2214 list_add(&enabler_ref->node, &event_priv->enablers_ref_head);
b01155ba
FD		 2215 }
2216
3622cd47
MD		 2217 lttng_event_enabler_init_event_filter(event_enabler, event);
2218 lttng_event_enabler_init_event_capture(event_enabler, event);
b01155ba
FD		 2219 }
2220 return 0;
2221}
2222
3c997079
MD		 2223/*
2224 * Called at module load: connect the probe on all enablers matching
2225 * this event.
2226 * Called with sessions lock held.
2227 */
2228int lttng_fix_pending_events(void)
2229{
8cdc1a81 2230 struct lttng_kernel_session_private *session_priv;
3c997079 2231
8cdc1a81
MD		 2232 list_for_each_entry(session_priv, &sessions, list)
2233 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2234 return 0;
2235}
2236
b01155ba
FD		 2237static bool lttng_event_notifier_group_has_active_event_notifiers(
2238 struct lttng_event_notifier_group *event_notifier_group)
2239{
09710b83 2240 struct lttng_event_enabler_common *event_enabler;
b01155ba 2241
09710b83
MD		 2242 list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) {
2243 if (event_enabler->enabled)
b01155ba
FD		 2244 return true;
2245 }
2246 return false;
2247}
2248
2249bool lttng_event_notifier_active(void)
2250{
2251 struct lttng_event_notifier_group *event_notifier_group;
2252
2253 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2254 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2255 return true;
2256 }
2257 return false;
2258}
2259
2260int lttng_fix_pending_event_notifiers(void)
2261{
2262 struct lttng_event_notifier_group *event_notifier_group;
2263
2264 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2265 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2266 return 0;
2267}
2268
1ae083ba 2269struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2270 enum lttng_enabler_format_type format_type,
606828e4 2271 struct lttng_kernel_abi_event *event_param,
f7d06400 2272 struct lttng_kernel_channel_buffer *chan)
3c997079 2273{
1ae083ba 2274 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2275
b2bc0bc8
FD		 2276 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2277 if (!event_enabler)
3c997079 2278 return NULL;
0bb716a8 2279 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2280 event_enabler->parent.format_type = format_type;
2281 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2282 memcpy(&event_enabler->parent.event_param, event_param,
2283 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2284 event_enabler->chan = chan;
3c997079 2285 /* ctx left NULL */
5b9817ae 2286 event_enabler->parent.enabled = 0;
def1e304
MD		 2287 return event_enabler;
2288}
2289
2290void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2291 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2292{
3c997079 2293 mutex_lock(&sessions_mutex);
09710b83
MD		 2294 list_add(&event_enabler->parent.node, &session->priv->enablers_head);
2295 event_enabler->parent.published = true;
def1e304 2296 lttng_session_lazy_sync_event_enablers(session);
3c997079 2297 mutex_unlock(&sessions_mutex);
3c997079
MD		 2298}
2299
7b25ab0e 2300int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2301{
2302 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2303 event_enabler->enabled = 1;
2304 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2305 mutex_unlock(&sessions_mutex);
2306 return 0;
2307}
2308
7b25ab0e 2309int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2310{
2311 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2312 event_enabler->enabled = 0;
2313 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2314 mutex_unlock(&sessions_mutex);
2315 return 0;
2316}
2317
b2bc0bc8 2318static
8d554755 2319int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2320 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2321{
d64ca521 2322 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2323 uint32_t bytecode_len;
2324 int ret;
2325
2326 ret = get_user(bytecode_len, &bytecode->len);
2327 if (ret)
2328 return ret;
52cfcdf3 2329 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2330 GFP_KERNEL);
2331 if (!bytecode_node)
2332 return -ENOMEM;
2333 ret = copy_from_user(&bytecode_node->bc, bytecode,
2334 sizeof(*bytecode) + bytecode_len);
2335 if (ret)
2336 goto error_free;
b2bc0bc8 2337
8a445457 2338 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2339 bytecode_node->enabler = enabler;
2340 /* Enforce length based on allocated size */
2341 bytecode_node->bc.len = bytecode_len;
2342 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2343
07dfc1d0
MD		 2344 return 0;
2345
2346error_free:
52cfcdf3 2347 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2348 return ret;
2349}
2350
6048044f 2351int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2352 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2353{
2354 int ret;
6048044f 2355 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2356 if (ret)
2357 goto error;
7b25ab0e 2358 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2359 return 0;
2360
2361error:
2362 return ret;
2363}
2364
e2d5dbc7 2365int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2366 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2367{
2368
e2d5dbc7 2369 switch (event->priv->instrumentation) {
606828e4 2370 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2371 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2372 default:
2373 return -EINVAL;
2374 }
2375}
2376
3c997079 2377static
8d554755 2378void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2379{
d64ca521 2380 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2381
2382 /* Destroy filter bytecode */
2383 list_for_each_entry_safe(filter_node, tmp_filter_node,
2384 &enabler->filter_bytecode_head, node) {
52cfcdf3 2385 lttng_kvfree(filter_node);
07dfc1d0 2386 }
b2bc0bc8
FD		 2387}
2388
44b1abdc 2389void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2390{
09710b83
MD		 2391 lttng_enabler_destroy(event_enabler);
2392 if (event_enabler->published)
2393 list_del(&event_enabler->node);
2394
44b1abdc
MD		 2395 switch (event_enabler->enabler_type) {
2396 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2397 {
2398 struct lttng_event_recorder_enabler *event_recorder_enabler =
2399 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2400
44b1abdc
MD		 2401 kfree(event_recorder_enabler);
2402 break;
2403 }
2404 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2405 {
2406 struct lttng_event_notifier_enabler *event_notifier_enabler =
2407 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2408
44b1abdc
MD		 2409 kfree(event_notifier_enabler);
2410 break;
2411 }
2412 default:
2413 WARN_ON_ONCE(1);
2414 }
3c997079
MD		 2415}
2416
dffef45d 2417struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2418 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2419 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2420 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2421{
2422 struct lttng_event_notifier_enabler *event_notifier_enabler;
2423
2424 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2425 if (!event_notifier_enabler)
2426 return NULL;
2427
0bb716a8 2428 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2429 event_notifier_enabler->parent.format_type = format_type;
2430 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2431 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2432
99f52fcc 2433 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2434 event_notifier_enabler->num_captures = 0;
dffef45d 2435
5b9817ae
MD		 2436 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2437 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2438
5b9817ae
MD		 2439 event_notifier_enabler->parent.enabled = 0;
2440 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2441 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2442 return event_notifier_enabler;
2443}
dffef45d 2444
1bbb5b2d
MD		 2445void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2446 struct lttng_event_notifier_enabler *event_notifier_enabler)
2447{
dffef45d 2448 mutex_lock(&sessions_mutex);
09710b83
MD		 2449 list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head);
2450 event_notifier_enabler->parent.published = true;
b01155ba 2451 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2452 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2453}
2454
2455int lttng_event_notifier_enabler_enable(
2456 struct lttng_event_notifier_enabler *event_notifier_enabler)
2457{
2458 mutex_lock(&sessions_mutex);
2459 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2460 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2461 mutex_unlock(&sessions_mutex);
2462 return 0;
2463}
2464
2465int lttng_event_notifier_enabler_disable(
2466 struct lttng_event_notifier_enabler *event_notifier_enabler)
2467{
2468 mutex_lock(&sessions_mutex);
2469 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2470 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2471 mutex_unlock(&sessions_mutex);
2472 return 0;
2473}
2474
99d223ad
FD		 2475int lttng_event_notifier_enabler_attach_capture_bytecode(
2476 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2477 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2478{
d64ca521 2479 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2480 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2481 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2482 uint32_t bytecode_len;
2483 int ret;
2484
2485 ret = get_user(bytecode_len, &bytecode->len);
2486 if (ret)
2487 return ret;
2488
2489 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2490 GFP_KERNEL);
2491 if (!bytecode_node)
2492 return -ENOMEM;
2493
2494 ret = copy_from_user(&bytecode_node->bc, bytecode,
2495 sizeof(*bytecode) + bytecode_len);
2496 if (ret)
2497 goto error_free;
2498
8a445457 2499 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2500 bytecode_node->enabler = enabler;
2501
2502 /* Enforce length based on allocated size */
2503 bytecode_node->bc.len = bytecode_len;
2504 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2505
2506 event_notifier_enabler->num_captures++;
2507
2508 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2509 goto end;
2510
2511error_free:
2512 lttng_kvfree(bytecode_node);
2513end:
2514 return ret;
2515}
2516
cc5719b1
MD		 2517static
2518void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event)
2519{
2520 int has_enablers_without_filter_bytecode = 0, nr_filters = 0;
2521 struct lttng_kernel_bytecode_runtime *runtime;
2522 struct lttng_enabler_ref *enabler_ref;
2523
2524 /* Check if has enablers without bytecode enabled */
2525 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2526 if (enabler_ref->ref->enabled
2527 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2528 has_enablers_without_filter_bytecode = 1;
2529 break;
2530 }
2531 }
2532 event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode;
2533
2534 /* Enable filters */
2535 list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) {
2536 lttng_bytecode_sync_state(runtime);
2537 nr_filters++;
2538 }
2539 WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters));
2540}
2541
2542static
2543void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event)
2544{
2545 switch (event->type) {
2546 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2547 break;
2548 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2549 {
2550 struct lttng_kernel_event_notifier *event_notifier =
2551 container_of(event, struct lttng_kernel_event_notifier, parent);
2552 struct lttng_kernel_bytecode_runtime *runtime;
2553 int nr_captures = 0;
2554
2555 /* Enable captures */
2556 list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) {
2557 lttng_bytecode_sync_state(runtime);
2558 nr_captures++;
2559 }
2560 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2561 break;
2562 }
2563 default:
2564 WARN_ON_ONCE(1);
2565 }
2566}
2567
a0c6ad2e
MD		 2568static
2569bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event)
2570{
2571 struct lttng_enabler_ref *enabler_ref;
2572 bool enabled = false;
2573
2574 switch (event->priv->instrumentation) {
2575 case LTTNG_KERNEL_ABI_TRACEPOINT:
2576 lttng_fallthrough;
2577 case LTTNG_KERNEL_ABI_SYSCALL:
2578 /* Enable events */
2579 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2580 if (enabler_ref->ref->enabled) {
2581 enabled = true;
2582 break;
2583 }
2584 }
2585 break;
2586 default:
2587 WARN_ON_ONCE(1);
2588 return false;
2589 }
2590
2591 switch (event->type) {
2592 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2593 {
2594 struct lttng_kernel_event_recorder *event_recorder =
2595 container_of(event, struct lttng_kernel_event_recorder, parent);
2596
2597 /*
2598 * Enabled state is based on union of enablers, with
2599 * intersection of session and channel transient enable
2600 * states.
2601 */
2602 return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2603 }
2604 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2605 return enabled;
2606 default:
2607 WARN_ON_ONCE(1);
2608 return false;
2609 }
2610}
2611
2612static
2613bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event)
2614{
2615 switch (event->priv->instrumentation) {
2616 case LTTNG_KERNEL_ABI_TRACEPOINT:
2617 lttng_fallthrough;
2618 case LTTNG_KERNEL_ABI_SYSCALL:
2619 return true;
2620
2621 default:
2622 /* Not handled with lazy sync. */
2623 return false;
2624 }
2625}
2626
3c997079 2627/*
3c997079
MD		 2628 * Should be called with sessions mutex held.
2629 */
2630static
a0c6ad2e
MD		 2631void lttng_sync_event_list(struct list_head *event_enabler_list,
2632 struct list_head *event_list)
3c997079 2633{
a0c6ad2e 2634 struct lttng_kernel_event_common_private *event_priv;
09710b83 2635 struct lttng_event_enabler_common *event_enabler;
3c997079 2636
a0c6ad2e 2637 list_for_each_entry(event_enabler, event_enabler_list, node)
09710b83 2638 lttng_event_enabler_ref_events(event_enabler);
a0c6ad2e 2639
3c997079
MD		 2640 /*
2641 * For each event, if at least one of its enablers is enabled,
2642 * and its channel and session transient states are enabled, we
2643 * enable the event, else we disable it.
2644 */
a0c6ad2e
MD		 2645 list_for_each_entry(event_priv, event_list, node) {
2646 struct lttng_kernel_event_common *event = event_priv->pub;
2647 bool enabled;
b4a75708 2648
a0c6ad2e 2649 if (!lttng_event_is_lazy_sync(event))
3c997079 2650 continue;
3c997079 2651
a0c6ad2e
MD		 2652 enabled = lttng_get_event_enabled_state(event);
2653 WRITE_ONCE(event->enabled, enabled);
3c997079 2654 /*
a0c6ad2e 2655 * Sync tracepoint registration with event enabled state.
3c997079
MD		 2656 */
2657 if (enabled) {
6a338ba4
MD		 2658 if (!event_priv->registered)
2659 register_event(event);
3c997079 2660 } else {
6a338ba4
MD		 2661 if (event_priv->registered)
2662 unregister_event(event);
3c997079 2663 }
07dfc1d0 2664
a0c6ad2e
MD		 2665 lttng_event_sync_filter_state(event);
2666 lttng_event_sync_capture_state(event);
3c997079
MD		 2667 }
2668}
2669
a0c6ad2e
MD		 2670/*
2671 * lttng_session_sync_event_enablers should be called just before starting a
2672 * session.
2673 */
2674static
2675void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2676{
2677 lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events);
2678}
2679
3c997079
MD		 2680/*
2681 * Apply enablers to session events, adding events to session if need
2682 * be. It is required after each modification applied to an active
2683 * session, and right before session "start".
2684 * "lazy" sync means we only sync if required.
2685 * Should be called with sessions mutex held.
2686 */
2687static
8cdc1a81 2688void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2689{
2690 /* We can skip if session is not active */
2691 if (!session->active)
2692 return;
b2bc0bc8 2693 lttng_session_sync_event_enablers(session);
3c997079
MD		 2694}
2695
b01155ba
FD		 2696static
2697void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2698{
a0c6ad2e 2699 lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head);
b01155ba
FD		 2700}
2701
7b25ab0e
MD		 2702static
2703void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2704{
2705 switch (event_enabler->enabler_type) {
2706 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2707 {
2708 struct lttng_event_recorder_enabler *event_recorder_enabler =
2709 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2710 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2711 break;
2712 }
2713 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2714 {
2715 struct lttng_event_notifier_enabler *event_notifier_enabler =
2716 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2717 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2718 break;
2719 }
2720 default:
2721 WARN_ON_ONCE(1);
2722 }
2723}
2724
1ec3f75a 2725/*
d83004aa
JD		 2726 * Serialize at most one packet worth of metadata into a metadata
2727 * channel.
92d9f5e6
MD		 2728 * We grab the metadata cache mutex to get exclusive access to our metadata
2729 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2730 * allows us to do racy operations such as looking for remaining space left in
2731 * packet and write, since mutual exclusion protects us from concurrent writes.
2732 * Mutual exclusion on the metadata cache allow us to read the cache content
2733 * without racing against reallocation of the cache by updates.
35097f36
JD		 2734 * Returns the number of bytes written in the channel, 0 if no data
2735 * was written and a negative value on error.
1ec3f75a 2736 */
b3b8072b 2737int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2738 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2739{
8a57ec02 2740 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2741 int ret = 0;
2742 size_t len, reserve_len;
2743
f613e3e6 2744 /*
92d9f5e6
MD		 2745 * Ensure we support mutiple get_next / put sequences followed by
2746 * put_next. The metadata cache lock protects reading the metadata
2747 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2748 * "flush" operations on the buffer invoked by different processes.
2749 * Moreover, since the metadata cache memory can be reallocated, we
2750 * need to have exclusive access against updates even though we only
2751 * read it.
f613e3e6 2752 */
92d9f5e6 2753 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2754 WARN_ON(stream->metadata_in < stream->metadata_out);
2755 if (stream->metadata_in != stream->metadata_out)
de23d59d 2756 goto end;
f613e3e6 2757
9616f0bf
JD		 2758 /* Metadata regenerated, change the version. */
2759 if (stream->metadata_cache->version != stream->version)
2760 stream->version = stream->metadata_cache->version;
2761
d83004aa 2762 len = stream->metadata_cache->metadata_written -
f613e3e6 2763 stream->metadata_in;
9de2c215 2764 if (!len)
de23d59d 2765 goto end;
d83004aa 2766 reserve_len = min_t(size_t,
4a399b76 2767 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2768 len);
a775608d 2769 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2770 sizeof(char), NULL);
d83004aa
JD		 2771 /*
2772 * If reservation failed, return an error to the caller.
2773 */
c2fb9c1c 2774 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2775 if (ret != 0) {
2776 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2777 stream->coherent = false;
d83004aa
JD		 2778 goto end;
2779 }
b3b8072b 2780 stream->transport->ops.event_write(&ctx,
f613e3e6 2781 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2782 reserve_len, 1);
b3b8072b 2783 stream->transport->ops.event_commit(&ctx);
f613e3e6 2784 stream->metadata_in += reserve_len;
3e75e2a7 2785 if (reserve_len < len)
8b97fd42
MD		 2786 stream->coherent = false;
2787 else
2788 stream->coherent = true;
d83004aa
JD		 2789 ret = reserve_len;
2790
2791end:
8b97fd42
MD		 2792 if (coherent)
2793 *coherent = stream->coherent;
92d9f5e6 2794 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2795 return ret;
2796}
2797
8b97fd42 2798static
8cdc1a81 2799void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2800{
8cdc1a81
MD		 2801 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2802 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2803}
2804
2805static
8cdc1a81 2806void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2807{
8cdc1a81
MD		 2808 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2809 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2810 struct lttng_metadata_stream *stream;
2811
8cdc1a81 2812 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2813 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2814 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2815 }
8b97fd42
MD		 2816}
2817
d83004aa
JD		 2818/*
2819 * Write the metadata to the metadata cache.
2820 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2821 * The metadata cache lock protects us from concurrent read access from
2822 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2823 * The content of the printf is printed as a single atomic metadata
2824 * transaction.
d83004aa 2825 */
8cdc1a81 2826int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2827 const char *fmt, ...)
2828{
c099397a 2829 char *str;
d83004aa 2830 size_t len;
c099397a
MD		 2831 va_list ap;
2832
585e5dcc 2833 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2834
2835 va_start(ap, fmt);
2836 str = kvasprintf(GFP_KERNEL, fmt, ap);
2837 va_end(ap);
2838 if (!str)
2839 return -ENOMEM;
2840
1ec3f75a 2841 len = strlen(str);
8cdc1a81
MD		 2842 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2843 if (session->priv->metadata_cache->metadata_written + len >
2844 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2845 char *tmp_cache_realloc;
2846 unsigned int tmp_cache_alloc_size;
2847
2848 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2849 session->priv->metadata_cache->cache_alloc + len,
2850 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2851 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2852 if (!tmp_cache_realloc)
2853 goto err;
8cdc1a81 2854 if (session->priv->metadata_cache->data) {
a606b6e8 2855 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 2856 session->priv->metadata_cache->data,
2857 session->priv->metadata_cache->cache_alloc);
2858 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 2859 }
2860
8cdc1a81
MD		 2861 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2862 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 2863 }
8cdc1a81
MD		 2864 memcpy(session->priv->metadata_cache->data +
2865 session->priv->metadata_cache->metadata_written,
d83004aa 2866 str, len);
8cdc1a81 2867 session->priv->metadata_cache->metadata_written += len;
c099397a 2868 kfree(str);
d83004aa 2869
d83004aa
JD		 2870 return 0;
2871
2872err:
2873 kfree(str);
2874 return -ENOMEM;
c099397a
MD		 2875}
2876
f513b2bf 2877static
8cdc1a81 2878int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 2879{
2880 size_t i;
2881
2882 for (i = 0; i < nesting; i++) {
2883 int ret;
2884
2885 ret = lttng_metadata_printf(session, " ");
2886 if (ret) {
2887 return ret;
2888 }
2889 }
2890 return 0;
2891}
2892
ceabb767 2893static
8cdc1a81 2894int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 2895 const struct lttng_kernel_event_field *field,
ceabb767
MD		 2896 size_t nesting)
2897{
2898 return lttng_metadata_printf(session, " _%s;\n", field->name);
2899}
2900
2901static
8cdc1a81 2902int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 2903 const struct lttng_kernel_type_integer *type,
2904 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 2905 size_t nesting)
2906{
2907 int ret;
2908
ceabb767
MD		 2909 ret = print_tabs(session, nesting);
2910 if (ret)
2911 return ret;
2912 ret = lttng_metadata_printf(session,
2913 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 2914 type->size,
2915 type->alignment,
2916 type->signedness,
2917 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 2918 ? "none"
437d5aa5 2919 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 2920 ? "UTF8"
2921 : "ASCII",
437d5aa5 2922 type->base,
ceabb767 2923#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 2924 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 2925#else
437d5aa5 2926 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 2927#endif
2928 );
2929 return ret;
2930}
2931
f513b2bf
MD		 2932/*
2933 * Must be called with sessions_mutex held.
2934 */
2935static
8cdc1a81 2936int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 2937 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 2938 size_t nesting)
2939{
51ef4536 2940 const char *prev_field_name = NULL;
f513b2bf
MD		 2941 int ret;
2942 uint32_t i, nr_fields;
ceabb767
MD		 2943 unsigned int alignment;
2944
f513b2bf
MD		 2945 ret = print_tabs(session, nesting);
2946 if (ret)
2947 return ret;
2948 ret = lttng_metadata_printf(session,
2949 "struct {\n");
2950 if (ret)
2951 return ret;
437d5aa5 2952 nr_fields = type->nr_fields;
f513b2bf 2953 for (i = 0; i < nr_fields; i++) {
437d5aa5 2954 const struct lttng_kernel_event_field *iter_field;
f513b2bf 2955
437d5aa5 2956 iter_field = type->fields[i];
51ef4536 2957 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 2958 if (ret)
2959 return ret;
2960 }
2961 ret = print_tabs(session, nesting);
2962 if (ret)
2963 return ret;
437d5aa5 2964 alignment = type->alignment;
ceabb767
MD		 2965 if (alignment) {
2966 ret = lttng_metadata_printf(session,
2967 "} align(%u)",
2968 alignment);
2969 } else {
2970 ret = lttng_metadata_printf(session,
2971 "}");
2972 }
f513b2bf
MD		 2973 return ret;
2974}
2975
2976/*
2977 * Must be called with sessions_mutex held.
2978 */
2979static
8cdc1a81 2980int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 2981 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 2982 size_t nesting)
2983{
2984 int ret;
2985
2986 ret = _lttng_struct_type_statedump(session,
437d5aa5 2987 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 2988 if (ret)
2989 return ret;
ceabb767 2990 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 2991}
2992
65c85aa6
MD		 2993/*
2994 * Must be called with sessions_mutex held.
2995 */
2996static
8cdc1a81 2997int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 2998 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 2999 size_t nesting,
3000 const char *prev_field_name)
65c85aa6 3001{
51ef4536 3002 const char *tag_name;
65c85aa6
MD		 3003 int ret;
3004 uint32_t i, nr_choices;
3005
51ef4536
MD		 3006 tag_name = type->tag_name;
3007 if (!tag_name)
3008 tag_name = prev_field_name;
3009 if (!tag_name)
3010 return -EINVAL;
ceabb767
MD		 3011 /*
3012 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3013 */
437d5aa5 3014 if (type->alignment != 0)
ceabb767 3015 return -EINVAL;
65c85aa6
MD		 3016 ret = print_tabs(session, nesting);
3017 if (ret)
3018 return ret;
3019 ret = lttng_metadata_printf(session,
3020 "variant <_%s> {\n",
51ef4536 3021 tag_name);
65c85aa6
MD		 3022 if (ret)
3023 return ret;
437d5aa5 3024 nr_choices = type->nr_choices;
65c85aa6 3025 for (i = 0; i < nr_choices; i++) {
437d5aa5 3026 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3027
437d5aa5 3028 iter_field = type->choices[i];
51ef4536 3029 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3030 if (ret)
3031 return ret;
3032 }
3033 ret = print_tabs(session, nesting);
3034 if (ret)
3035 return ret;
3036 ret = lttng_metadata_printf(session,
3037 "}");
3038 return ret;
3039}
3040
3041/*
3042 * Must be called with sessions_mutex held.
3043 */
3044static
8cdc1a81 3045int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3046 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3047 size_t nesting,
3048 const char *prev_field_name)
65c85aa6
MD		 3049{
3050 int ret;
3051
3052 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3053 lttng_kernel_get_type_variant(field->type), nesting,
3054 prev_field_name);
65c85aa6
MD		 3055 if (ret)
3056 return ret;
ceabb767 3057 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3058}
3059
f513b2bf
MD		 3060/*
3061 * Must be called with sessions_mutex held.
3062 */
3063static
8cdc1a81 3064int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3065 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3066 size_t nesting)
3067{
3068 int ret;
437d5aa5
MD		 3069 const struct lttng_kernel_type_array *array_type;
3070 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3071
437d5aa5
MD		 3072 array_type = lttng_kernel_get_type_array(field->type);
3073 WARN_ON_ONCE(!array_type);
ceabb767 3074
437d5aa5 3075 if (array_type->alignment) {
ceabb767 3076 ret = print_tabs(session, nesting);
f513b2bf
MD		 3077 if (ret)
3078 return ret;
ceabb767
MD		 3079 ret = lttng_metadata_printf(session,
3080 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3081 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3082 field->name);
3083 if (ret)
3084 return ret;
3085 }
3086 /*
3087 * Nested compound types: Only array of structures and variants are
3088 * currently supported.
3089 */
437d5aa5 3090 elem_type = array_type->elem_type;
12bb2edb
MD		 3091 switch (elem_type->type) {
3092 case lttng_kernel_type_integer:
437d5aa5
MD		 3093 case lttng_kernel_type_struct:
3094 case lttng_kernel_type_variant:
3095 ret = _lttng_type_statedump(session, elem_type,
3096 array_type->encoding, nesting);
65c85aa6
MD		 3097 if (ret)
3098 return ret;
3099 break;
ceabb767 3100
f513b2bf
MD		 3101 default:
3102 return -EINVAL;
3103 }
3104 ret = lttng_metadata_printf(session,
3105 " _%s[%u];\n",
3106 field->name,
437d5aa5 3107 array_type->length);
f513b2bf
MD		 3108 return ret;
3109}
3110
3111/*
3112 * Must be called with sessions_mutex held.
3113 */
3114static
8cdc1a81 3115int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3116 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3117 size_t nesting,
3118 const char *prev_field_name)
f513b2bf
MD		 3119{
3120 int ret;
3121 const char *length_name;
437d5aa5
MD		 3122 const struct lttng_kernel_type_sequence *sequence_type;
3123 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3124
437d5aa5
MD		 3125 sequence_type = lttng_kernel_get_type_sequence(field->type);
3126 WARN_ON_ONCE(!sequence_type);
f513b2bf 3127
437d5aa5 3128 length_name = sequence_type->length_name;
51ef4536
MD		 3129 if (!length_name)
3130 length_name = prev_field_name;
3131 if (!length_name)
3132 return -EINVAL;
ceabb767 3133
437d5aa5 3134 if (sequence_type->alignment) {
ceabb767 3135 ret = print_tabs(session, nesting);
f513b2bf
MD		 3136 if (ret)
3137 return ret;
ceabb767
MD		 3138 ret = lttng_metadata_printf(session,
3139 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3140 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3141 field->name);
3142 if (ret)
3143 return ret;
3144 }
3145
3146 /*
3147 * Nested compound types: Only array of structures and variants are
3148 * currently supported.
3149 */
437d5aa5 3150 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3151 switch (elem_type->type) {
3152 case lttng_kernel_type_integer:
437d5aa5
MD		 3153 case lttng_kernel_type_struct:
3154 case lttng_kernel_type_variant:
3155 ret = _lttng_type_statedump(session, elem_type,
3156 sequence_type->encoding, nesting);
65c85aa6
MD		 3157 if (ret)
3158 return ret;
3159 break;
ceabb767 3160
f513b2bf
MD		 3161 default:
3162 return -EINVAL;
3163 }
3164 ret = lttng_metadata_printf(session,
3165 " _%s[ _%s ];\n",
3166 field->name,
51ef4536 3167 length_name);
f513b2bf
MD		 3168 return ret;
3169}
3170
141ddf28
MD		 3171/*
3172 * Must be called with sessions_mutex held.
3173 */
3174static
8cdc1a81 3175int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3176 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3177 size_t nesting)
3178{
d96a4a7a 3179 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3180 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3181 int ret;
3182 unsigned int i, nr_entries;
3183
437d5aa5 3184 container_type = type->container_type;
12bb2edb 3185 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3186 ret = -EINVAL;
3187 goto end;
3188 }
437d5aa5 3189 enum_desc = type->desc;
141ddf28
MD		 3190 nr_entries = enum_desc->nr_entries;
3191
3192 ret = print_tabs(session, nesting);
3193 if (ret)
3194 goto end;
ceabb767
MD		 3195 ret = lttng_metadata_printf(session, "enum : ");
3196 if (ret)
3197 goto end;
437d5aa5
MD		 3198 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3199 lttng_kernel_string_encoding_none, 0);
141ddf28 3200 if (ret)
ceabb767
MD		 3201 goto end;
3202 ret = lttng_metadata_printf(session, " {\n");
3203 if (ret)
3204 goto end;
141ddf28
MD		 3205 /* Dump all entries */
3206 for (i = 0; i < nr_entries; i++) {
437d5aa5 3207 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3208 int j, len;
3209
3210 ret = print_tabs(session, nesting + 1);
3211 if (ret)
3212 goto end;
3213 ret = lttng_metadata_printf(session,
3214 "\"");
3215 if (ret)
3216 goto end;
3217 len = strlen(entry->string);
3218 /* Escape the character '"' */
3219 for (j = 0; j < len; j++) {
3220 char c = entry->string[j];
3221
3222 switch (c) {
3223 case '"':
3224 ret = lttng_metadata_printf(session,
3225 "\\\"");
3226 break;
3227 case '\\':
3228 ret = lttng_metadata_printf(session,
3229 "\\\\");
3230 break;
3231 default:
3232 ret = lttng_metadata_printf(session,
3233 "%c", c);
3234 break;
3235 }
3236 if (ret)
3237 goto end;
3238 }
08ad1061
PP		 3239 ret = lttng_metadata_printf(session, "\"");
3240 if (ret)
3241 goto end;
3242
3243 if (entry->options.is_auto) {
3244 ret = lttng_metadata_printf(session, ",\n");
3245 if (ret)
3246 goto end;
141ddf28 3247 } else {
7c559490
MD		 3248 ret = lttng_metadata_printf(session,
3249 " = ");
3250 if (ret)
3251 goto end;
3252 if (entry->start.signedness)
141ddf28 3253 ret = lttng_metadata_printf(session,
7c559490
MD		 3254 "%lld", (long long) entry->start.value);
3255 else
3256 ret = lttng_metadata_printf(session,
3257 "%llu", entry->start.value);
3258 if (ret)
3259 goto end;
3260 if (entry->start.signedness == entry->end.signedness &&
3261 entry->start.value
3262 == entry->end.value) {
141ddf28 3263 ret = lttng_metadata_printf(session,
7c559490
MD		 3264 ",\n");
3265 } else {
3266 if (entry->end.signedness) {
3267 ret = lttng_metadata_printf(session,
3268 " ... %lld,\n",
3269 (long long) entry->end.value);
3270 } else {
3271 ret = lttng_metadata_printf(session,
3272 " ... %llu,\n",
3273 entry->end.value);
3274 }
141ddf28 3275 }
7c559490
MD		 3276 if (ret)
3277 goto end;
141ddf28 3278 }
141ddf28
MD		 3279 }
3280 ret = print_tabs(session, nesting);
3281 if (ret)
3282 goto end;
ceabb767 3283 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3284end:
3285 return ret;
3286}
3287
d83004aa
JD		 3288/*
3289 * Must be called with sessions_mutex held.
3290 */
c099397a 3291static
8cdc1a81 3292int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3293 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3294 size_t nesting)
3295{
3296 int ret;
437d5aa5 3297 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3298
437d5aa5
MD		 3299 enum_type = lttng_kernel_get_type_enum(field->type);
3300 WARN_ON_ONCE(!enum_type);
3301 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3302 if (ret)
3303 return ret;
3304 return lttng_field_name_statedump(session, field, nesting);
3305}
3306
3307static
8cdc1a81 3308int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3309 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3310 size_t nesting)
3311{
3312 int ret;
3313
437d5aa5
MD		 3314 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3315 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3316 if (ret)
3317 return ret;
3318 return lttng_field_name_statedump(session, field, nesting);
3319}
3320
3321static
8cdc1a81 3322int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3323 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3324 size_t nesting)
3325{
3326 int ret;
3327
ceabb767
MD		 3328 /* Default encoding is UTF8 */
3329 ret = print_tabs(session, nesting);
3330 if (ret)
3331 return ret;
3332 ret = lttng_metadata_printf(session,
3333 "string%s",
437d5aa5 3334 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3335 " { encoding = ASCII; }" : "");
3336 return ret;
3337}
3338
3339static
8cdc1a81 3340int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3341 const struct lttng_kernel_event_field *field,
f513b2bf 3342 size_t nesting)
ceabb767 3343{
437d5aa5 3344 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3345 int ret;
3346
437d5aa5
MD		 3347 string_type = lttng_kernel_get_type_string(field->type);
3348 WARN_ON_ONCE(!string_type);
3349 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3350 if (ret)
3351 return ret;
3352 return lttng_field_name_statedump(session, field, nesting);
3353}
3354
3355/*
3356 * Must be called with sessions_mutex held.
3357 */
3358static
8cdc1a81 3359int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3360 const struct lttng_kernel_type_common *type,
3361 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3362 size_t nesting)
c099397a 3363{
c099397a 3364 int ret = 0;
c099397a 3365
12bb2edb
MD		 3366 switch (type->type) {
3367 case lttng_kernel_type_integer:
437d5aa5
MD		 3368 ret = _lttng_integer_type_statedump(session,
3369 lttng_kernel_get_type_integer(type),
3370 parent_encoding, nesting);
8070f5c0 3371 break;
437d5aa5
MD		 3372 case lttng_kernel_type_enum:
3373 ret = _lttng_enum_type_statedump(session,
3374 lttng_kernel_get_type_enum(type),
3375 nesting);
8070f5c0 3376 break;
12bb2edb 3377 case lttng_kernel_type_string:
437d5aa5
MD		 3378 ret = _lttng_string_type_statedump(session,
3379 lttng_kernel_get_type_string(type),
3380 nesting);
ceabb767 3381 break;
437d5aa5
MD		 3382 case lttng_kernel_type_struct:
3383 ret = _lttng_struct_type_statedump(session,
3384 lttng_kernel_get_type_struct(type),
3385 nesting);
8070f5c0 3386 break;
437d5aa5
MD		 3387 case lttng_kernel_type_variant:
3388 ret = _lttng_variant_type_statedump(session,
3389 lttng_kernel_get_type_variant(type),
51ef4536 3390 nesting, NULL);
ceabb767
MD		 3391 break;
3392
3393 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3394 case lttng_kernel_type_array:
3395 case lttng_kernel_type_sequence:
ceabb767
MD		 3396 default:
3397 WARN_ON_ONCE(1);
3398 return -EINVAL;
8070f5c0 3399 }
ceabb767
MD		 3400 return ret;
3401}
8070f5c0 3402
ceabb767
MD		 3403/*
3404 * Must be called with sessions_mutex held.
3405 */
3406static
8cdc1a81 3407int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3408 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3409 size_t nesting,
3410 const char **prev_field_name_p)
ceabb767 3411{
51ef4536 3412 const char *prev_field_name = NULL;
ceabb767 3413 int ret = 0;
27d2368e 3414
51ef4536
MD		 3415 if (prev_field_name_p)
3416 prev_field_name = *prev_field_name_p;
437d5aa5 3417 switch (field->type->type) {
12bb2edb 3418 case lttng_kernel_type_integer:
ceabb767
MD		 3419 ret = _lttng_integer_field_statedump(session, field, nesting);
3420 break;
437d5aa5 3421 case lttng_kernel_type_enum:
ceabb767 3422 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3423 break;
12bb2edb 3424 case lttng_kernel_type_string:
ceabb767 3425 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3426 break;
437d5aa5 3427 case lttng_kernel_type_struct:
ceabb767 3428 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3429 break;
437d5aa5 3430 case lttng_kernel_type_array:
ceabb767 3431 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3432 break;
437d5aa5 3433 case lttng_kernel_type_sequence:
51ef4536 3434 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3435 break;
437d5aa5 3436 case lttng_kernel_type_variant:
51ef4536 3437 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3438 break;
f513b2bf 3439
8070f5c0
MD		 3440 default:
3441 WARN_ON_ONCE(1);
3442 return -EINVAL;
3443 }
51ef4536
MD		 3444 if (prev_field_name_p)
3445 *prev_field_name_p = field->name;
8070f5c0
MD		 3446 return ret;
3447}
3448
3449static
8cdc1a81 3450int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3451 struct lttng_kernel_ctx *ctx)
8070f5c0 3452{
51ef4536 3453 const char *prev_field_name = NULL;
8070f5c0
MD		 3454 int ret = 0;
3455 int i;
3456
3457 if (!ctx)
3458 return 0;
3459 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3460 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3461
51ef4536 3462 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3463 if (ret)
3464 return ret;
3465 }
3466 return ret;
3467}
3468
3469static
8cdc1a81 3470int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3471 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3472{
51ef4536 3473 const char *prev_field_name = NULL;
a67ba386 3474 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3475 int ret = 0;
3476 int i;
3477
6c8c025b
MD		 3478 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3479 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3480
51ef4536 3481 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3482 if (ret)
3483 return ret;
c099397a
MD		 3484 }
3485 return ret;
3486}
3487
d83004aa
JD		 3488/*
3489 * Must be called with sessions_mutex held.
8b97fd42
MD		 3490 * The entire event metadata is printed as a single atomic metadata
3491 * transaction.
d83004aa 3492 */
c099397a 3493static
ee7e9a18 3494int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event)
c099397a 3495{
ee7e9a18
MD		 3496 struct lttng_kernel_event_recorder *event_recorder;
3497 struct lttng_kernel_channel_buffer *chan;
3498 struct lttng_kernel_session *session;
c099397a
MD		 3499 int ret = 0;
3500
ee7e9a18
MD		 3501 if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER)
3502 return 0;
3503 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3504 chan = event_recorder->chan;
3505 session = chan->parent.session;
3506
a67ba386 3507 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3508 return 0;
f7d06400 3509 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3510 return 0;
3511
8b97fd42
MD		 3512 lttng_metadata_begin(session);
3513
c099397a
MD		 3514 ret = lttng_metadata_printf(session,
3515 "event {\n"
ae734547 3516 " name = \"%s\";\n"
c099397a 3517 " id = %u;\n"
b9074a1b 3518 " stream_id = %u;\n",
a67ba386
MD		 3519 event_recorder->priv->parent.desc->event_name,
3520 event_recorder->priv->id,
f7d06400 3521 event_recorder->chan->priv->id);
c099397a
MD		 3522 if (ret)
3523 goto end;
3524
8070f5c0 3525 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3526 " fields := struct {\n"
3527 );
3528 if (ret)
3529 goto end;
3530
a67ba386 3531 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3532 if (ret)
3533 goto end;
3534
3535 /*
3536 * LTTng space reservation can only reserve multiples of the
3537 * byte size.
3538 */
3539 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3540 " };\n"
3541 "};\n\n");
c099397a
MD		 3542 if (ret)
3543 goto end;
3544
a67ba386 3545 event_recorder->priv->metadata_dumped = 1;
c099397a 3546end:
8b97fd42 3547 lttng_metadata_end(session);
c099397a
MD		 3548 return ret;
3549
3550}
3551
d83004aa
JD		 3552/*
3553 * Must be called with sessions_mutex held.
8b97fd42
MD		 3554 * The entire channel metadata is printed as a single atomic metadata
3555 * transaction.
d83004aa 3556 */
c099397a 3557static
8cdc1a81 3558int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3559 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3560{
3561 int ret = 0;
3562
f7d06400 3563 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3564 return 0;
d83004aa 3565
f7d06400 3566 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3567 return 0;
3568
8b97fd42
MD		 3569 lttng_metadata_begin(session);
3570
f7d06400 3571 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3572 ret = lttng_metadata_printf(session,
3573 "stream {\n"
3574 " id = %u;\n"
9115fbdc 3575 " event.header := %s;\n"
b9074a1b 3576 " packet.context := struct packet_context;\n",
f7d06400
MD		 3577 chan->priv->id,
3578 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3579 "struct event_header_large");
3580 if (ret)
3581 goto end;
3582
f7d06400 3583 if (chan->priv->ctx) {
b9074a1b
MD		 3584 ret = lttng_metadata_printf(session,
3585 " event.context := struct {\n");
3586 if (ret)
3587 goto end;
3588 }
f7d06400 3589 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3590 if (ret)
3591 goto end;
f7d06400 3592 if (chan->priv->ctx) {
b9074a1b
MD		 3593 ret = lttng_metadata_printf(session,
3594 " };\n");
3595 if (ret)
3596 goto end;
3597 }
8070f5c0
MD		 3598
3599 ret = lttng_metadata_printf(session,
b9074a1b 3600 "};\n\n");
8070f5c0 3601
f7d06400 3602 chan->priv->metadata_dumped = 1;
c099397a 3603end:
8b97fd42 3604 lttng_metadata_end(session);
c099397a
MD		 3605 return ret;
3606}
3607
d83004aa
JD		 3608/*
3609 * Must be called with sessions_mutex held.
3610 */
9115fbdc 3611static
8cdc1a81 3612int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3613{
3614 return lttng_metadata_printf(session,
3615 "struct packet_context {\n"
a3ccff4f
MD		 3616 " uint64_clock_monotonic_t timestamp_begin;\n"
3617 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3618 " uint64_t content_size;\n"
3619 " uint64_t packet_size;\n"
5b3cf4f9 3620 " uint64_t packet_seq_num;\n"
a9afe705 3621 " unsigned long events_discarded;\n"
9115fbdc 3622 " uint32_t cpu_id;\n"
c6dfdf6f 3623 "};\n\n"
9115fbdc
MD		 3624 );
3625}
3626
3627/*
3628 * Compact header:
3629 * id: range: 0 - 30.
3630 * id 31 is reserved to indicate an extended header.
3631 *
3632 * Large header:
3633 * id: range: 0 - 65534.
3634 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3635 *
3636 * Must be called with sessions_mutex held.
9115fbdc
MD		 3637 */
3638static
8cdc1a81 3639int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3640{
3641 return lttng_metadata_printf(session,
3642 "struct event_header_compact {\n"
3643 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3644 " variant <id> {\n"
3645 " struct {\n"
a3ccff4f 3646 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3647 " } compact;\n"
3648 " struct {\n"
3649 " uint32_t id;\n"
a3ccff4f 3650 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3651 " } extended;\n"
3652 " } v;\n"
3653 "} align(%u);\n"
3654 "\n"
3655 "struct event_header_large {\n"
3656 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3657 " variant <id> {\n"
3658 " struct {\n"
a3ccff4f 3659 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3660 " } compact;\n"
3661 " struct {\n"
3662 " uint32_t id;\n"
a3ccff4f 3663 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3664 " } extended;\n"
3665 " } v;\n"
3666 "} align(%u);\n\n",
a90917c3
MD		 3667 lttng_alignof(uint32_t) * CHAR_BIT,
3668 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3669 );
3670}
3671
a3ccff4f
MD		 3672 /*
3673 * Approximation of NTP time of day to clock monotonic correlation,
3674 * taken at start of trace.
3675 * Yes, this is only an approximation. Yes, we can (and will) do better
3676 * in future versions.
5283350b
MD		 3677 * This function may return a negative offset. It may happen if the
3678 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3679 *
3680 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3681 * y2038 compliant.
a3ccff4f
MD		 3682 */
3683static
8967b2a3 3684int64_t measure_clock_offset(void)
a3ccff4f 3685{
dcb93448 3686 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3687 uint64_t tcf = trace_clock_freq();
dcb93448 3688 int64_t offset;
a3ccff4f 3689 unsigned long flags;
3636085f
MJ		 3690#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3691 struct timespec64 rts = { 0, 0 };
3692#else
3693 struct timespec rts = { 0, 0 };
3694#endif
a3ccff4f
MD		 3695
3696 /* Disable interrupts to increase correlation precision. */
3697 local_irq_save(flags);
3698 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3699#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3700 ktime_get_real_ts64(&rts);
3701#else
216b6baa 3702 getnstimeofday(&rts);
3636085f 3703#endif
a3ccff4f
MD		 3704 monotonic[1] = trace_clock_read64();
3705 local_irq_restore(flags);
3706
dcb93448 3707 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3708 realtime = (uint64_t) rts.tv_sec * tcf;
3709 if (tcf == NSEC_PER_SEC) {
3710 realtime += rts.tv_nsec;
3711 } else {
3712 uint64_t n = rts.tv_nsec * tcf;
3713
3714 do_div(n, NSEC_PER_SEC);
3715 realtime += n;
3716 }
dcb93448 3717 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3718 return offset;
3719}
3720
3eb95be4 3721static
8cdc1a81 3722int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3723{
0f3eaad4 3724 int ret = 0;
3eb95be4
JR		 3725 size_t i;
3726 char cur;
3727
3728 i = 0;
3729 cur = string[i];
3730 while (cur != '\0') {
3731 switch (cur) {
3732 case '\n':
3733 ret = lttng_metadata_printf(session, "%s", "\\n");
3734 break;
3735 case '\\':
3736 case '"':
3737 ret = lttng_metadata_printf(session, "%c", '\\');
3738 if (ret)
3739 goto error;
3740 /* We still print the current char */
c190d76e 3741 lttng_fallthrough;
3eb95be4
JR		 3742 default:
3743 ret = lttng_metadata_printf(session, "%c", cur);
3744 break;
3745 }
3746
3747 if (ret)
3748 goto error;
3749
3750 cur = string[++i];
3751 }
3752error:
3753 return ret;
3754}
3755
3756static
8cdc1a81 3757int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3758 const char *field_value)
3eb95be4
JR		 3759{
3760 int ret;
3761
1c88f269 3762 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3763 if (ret)
3764 goto error;
3765
1c88f269 3766 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3767 if (ret)
3768 goto error;
3769
3770 ret = lttng_metadata_printf(session, "\";\n");
3771
3772error:
3773 return ret;
3774}
3775
c099397a
MD		 3776/*
3777 * Output metadata into this session's metadata buffers.
d83004aa 3778 * Must be called with sessions_mutex held.
c099397a
MD		 3779 */
3780static
8cdc1a81 3781int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3782{
8cdc1a81 3783 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3784 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3785 const char *product_uuid;
f7d06400 3786 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3787 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3788 int ret = 0;
3789
585e5dcc 3790 if (!LTTNG_READ_ONCE(session->active))
c099397a 3791 return 0;
8b97fd42
MD		 3792
3793 lttng_metadata_begin(session);
3794
8cdc1a81 3795 if (session->priv->metadata_dumped)
c099397a 3796 goto skip_session;
c099397a 3797
d793d5e1 3798 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3799 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3800 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3801 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3802 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3803 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3804
3805 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3806 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3807 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3808 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3809 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3810 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3811 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3812 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3813 "\n"
3814 "trace {\n"
3815 " major = %u;\n"
3816 " minor = %u;\n"
30bdb6e4 3817 " uuid = \"%s\";\n"
d793d5e1
MD		 3818 " byte_order = %s;\n"
3819 " packet.header := struct {\n"
3820 " uint32_t magic;\n"
1ec3f75a 3821 " uint8_t uuid[16];\n"
d793d5e1 3822 " uint32_t stream_id;\n"
5594698f 3823 " uint64_t stream_instance_id;\n"
0eb25f58 3824 " };\n"
d793d5e1 3825 "};\n\n",
a90917c3
MD		 3826 lttng_alignof(uint8_t) * CHAR_BIT,
3827 lttng_alignof(uint16_t) * CHAR_BIT,
3828 lttng_alignof(uint32_t) * CHAR_BIT,
3829 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3830 sizeof(unsigned long) * CHAR_BIT,
3831 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3832 CTF_SPEC_MAJOR,
3833 CTF_SPEC_MINOR,
d793d5e1 3834 uuid_s,
5214fa50 3835#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3836 "be"
3837#else
3838 "le"
3839#endif
3840 );
3841 if (ret)
3842 goto end;
3843
99dc9597
MD		 3844 ret = lttng_metadata_printf(session,
3845 "env {\n"
a6058143 3846 " hostname = \"%s\";\n"
c6c9e10f 3847 " domain = \"kernel\";\n"
99dc9597 3848 " sysname = \"%s\";\n"
c6c9e10f
MD		 3849 " kernel_release = \"%s\";\n"
3850 " kernel_version = \"%s\";\n"
3851 " tracer_name = \"lttng-modules\";\n"
3852 " tracer_major = %d;\n"
3853 " tracer_minor = %d;\n"
3854 " tracer_patchlevel = %d;\n"
3eb95be4 3855 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3856 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3857 utsname()->sysname,
3858 utsname()->release,
c6c9e10f
MD		 3859 utsname()->version,
3860 LTTNG_MODULES_MAJOR_VERSION,
3861 LTTNG_MODULES_MINOR_VERSION,
3862 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3863 );
3864 if (ret)
3865 goto end;
3866
8cdc1a81 3867 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 3868 if (ret)
3869 goto end;
3870 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 3871 session->priv->creation_time);
3eb95be4
JR		 3872 if (ret)
3873 goto end;
3874
c88f762e
GB		 3875 /* Add the product UUID to the 'env' section */
3876 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3877 if (product_uuid) {
3878 ret = lttng_metadata_printf(session,
3879 " product_uuid = \"%s\";\n",
3880 product_uuid
3881 );
3882 if (ret)
3883 goto end;
3884 }
3885
3886 /* Close the 'env' section */
3eb95be4
JR		 3887 ret = lttng_metadata_printf(session, "};\n\n");
3888 if (ret)
3889 goto end;
3890
a3ccff4f
MD		 3891 ret = lttng_metadata_printf(session,
3892 "clock {\n"
2754583e
MD		 3893 " name = \"%s\";\n",
3894 trace_clock_name()
a82c63f1
MD		 3895 );
3896 if (ret)
3897 goto end;
3898
3899 if (!trace_clock_uuid(clock_uuid_s)) {
3900 ret = lttng_metadata_printf(session,
7c27cb17 3901 " uuid = \"%s\";\n",
a82c63f1
MD		 3902 clock_uuid_s
3903 );
3904 if (ret)
3905 goto end;
3906 }
3907
3908 ret = lttng_metadata_printf(session,
2754583e 3909 " description = \"%s\";\n"
a3ccff4f
MD		 3910 " freq = %llu; /* Frequency, in Hz */\n"
3911 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 3912 " offset = %lld;\n"
a3ccff4f 3913 "};\n\n",
2754583e 3914 trace_clock_description(),
a3ccff4f 3915 (unsigned long long) trace_clock_freq(),
8967b2a3 3916 (long long) measure_clock_offset()
a3ccff4f
MD		 3917 );
3918 if (ret)
3919 goto end;
3920
3921 ret = lttng_metadata_printf(session,
3922 "typealias integer {\n"
3923 " size = 27; align = 1; signed = false;\n"
2754583e 3924 " map = clock.%s.value;\n"
a3ccff4f
MD		 3925 "} := uint27_clock_monotonic_t;\n"
3926 "\n"
3927 "typealias integer {\n"
3928 " size = 32; align = %u; signed = false;\n"
2754583e 3929 " map = clock.%s.value;\n"
a3ccff4f
MD		 3930 "} := uint32_clock_monotonic_t;\n"
3931 "\n"
3932 "typealias integer {\n"
3933 " size = 64; align = %u; signed = false;\n"
2754583e 3934 " map = clock.%s.value;\n"
a3ccff4f 3935 "} := uint64_clock_monotonic_t;\n\n",
2754583e 3936 trace_clock_name(),
a3ccff4f 3937 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 3938 trace_clock_name(),
3939 lttng_alignof(uint64_t) * CHAR_BIT,
3940 trace_clock_name()
a3ccff4f
MD		 3941 );
3942 if (ret)
3943 goto end;
3944
a90917c3 3945 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 3946 if (ret)
3947 goto end;
3948
a90917c3 3949 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 3950 if (ret)
3951 goto end;
3952
c099397a 3953skip_session:
f7d06400
MD		 3954 list_for_each_entry(chan_priv, &session->priv->chan, node) {
3955 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 3956 if (ret)
3957 goto end;
3958 }
3959
f237aef8 3960 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
ee7e9a18 3961 ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent);
c099397a
MD		 3962 if (ret)
3963 goto end;
3964 }
8cdc1a81 3965 session->priv->metadata_dumped = 1;
c099397a 3966end:
8b97fd42 3967 lttng_metadata_end(session);
c099397a
MD		 3968 return ret;
3969}
3970
c0e31d2e 3971/**
a90917c3 3972 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 3973 * @transport: transport structure
3974 *
3975 * Registers a transport which can be used as output to extract the data out of
3976 * LTTng. The module calling this registration function must ensure that no
3977 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 3978 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 3979 * is made visible to the transport function. This registration acts as a
263b6c88 3980 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 3981 * after its registration must it synchronize the TLBs.
3982 */
a90917c3 3983void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 3984{
3985 /*
3986 * Make sure no page fault can be triggered by the module about to be
3987 * registered. We deal with this here so we don't have to call
263b6c88 3988 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 3989 */
263b6c88 3990 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 3991
3992 mutex_lock(&sessions_mutex);
a90917c3 3993 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 3994 mutex_unlock(&sessions_mutex);
3995}
a90917c3 3996EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 3997
3998/**
a90917c3 3999 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4000 * @transport: transport structure
4001 */
a90917c3 4002void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4003{
4004 mutex_lock(&sessions_mutex);
4005 list_del(&transport->node);
4006 mutex_unlock(&sessions_mutex);
4007}
a90917c3 4008EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4009
a101fa10
MD		 4010void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4011{
4012 /*
4013 * Make sure no page fault can be triggered by the module about to be
4014 * registered. We deal with this here so we don't have to call
4015 * vmalloc_sync_mappings() in each module's init.
4016 */
4017 wrapper_vmalloc_sync_mappings();
4018
4019 mutex_lock(&sessions_mutex);
4020 list_add_tail(&transport->node, &lttng_counter_transport_list);
4021 mutex_unlock(&sessions_mutex);
4022}
4023EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4024
4025void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4026{
4027 mutex_lock(&sessions_mutex);
4028 list_del(&transport->node);
4029 mutex_unlock(&sessions_mutex);
4030}
4031EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4032
5f4c791e 4033#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4034
4035enum cpuhp_state lttng_hp_prepare;
4036enum cpuhp_state lttng_hp_online;
4037
4038static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4039{
4040 struct lttng_cpuhp_node *lttng_node;
4041
4042 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4043 switch (lttng_node->component) {
4044 case LTTNG_RING_BUFFER_FRONTEND:
4045 return 0;
4046 case LTTNG_RING_BUFFER_BACKEND:
4047 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4048 case LTTNG_RING_BUFFER_ITER:
4049 return 0;
4050 case LTTNG_CONTEXT_PERF_COUNTERS:
4051 return 0;
4052 default:
4053 return -EINVAL;
4054 }
4055}
4056
4057static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4058{
4059 struct lttng_cpuhp_node *lttng_node;
4060
4061 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4062 switch (lttng_node->component) {
4063 case LTTNG_RING_BUFFER_FRONTEND:
4064 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4065 case LTTNG_RING_BUFFER_BACKEND:
4066 return 0;
4067 case LTTNG_RING_BUFFER_ITER:
4068 return 0;
4069 case LTTNG_CONTEXT_PERF_COUNTERS:
4070 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4071 default:
4072 return -EINVAL;
4073 }
4074}
4075
4076static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4077{
4078 struct lttng_cpuhp_node *lttng_node;
4079
4080 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4081 switch (lttng_node->component) {
4082 case LTTNG_RING_BUFFER_FRONTEND:
4083 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4084 case LTTNG_RING_BUFFER_BACKEND:
4085 return 0;
4086 case LTTNG_RING_BUFFER_ITER:
4087 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4088 case LTTNG_CONTEXT_PERF_COUNTERS:
4089 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4090 default:
4091 return -EINVAL;
4092 }
4093}
4094
4095static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4096{
4097 struct lttng_cpuhp_node *lttng_node;
4098
4099 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4100 switch (lttng_node->component) {
4101 case LTTNG_RING_BUFFER_FRONTEND:
4102 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4103 case LTTNG_RING_BUFFER_BACKEND:
4104 return 0;
4105 case LTTNG_RING_BUFFER_ITER:
4106 return 0;
4107 case LTTNG_CONTEXT_PERF_COUNTERS:
4108 return 0;
4109 default:
4110 return -EINVAL;
4111 }
4112}
4113
4114static int __init lttng_init_cpu_hotplug(void)
4115{
4116 int ret;
4117
4118 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4119 lttng_hotplug_prepare,
4120 lttng_hotplug_dead);
4121 if (ret < 0) {
4122 return ret;
4123 }
4124 lttng_hp_prepare = ret;
4125 lttng_rb_set_hp_prepare(ret);
4126
4127 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4128 lttng_hotplug_online,
4129 lttng_hotplug_offline);
4130 if (ret < 0) {
4131 cpuhp_remove_multi_state(lttng_hp_prepare);
4132 lttng_hp_prepare = 0;
4133 return ret;
4134 }
4135 lttng_hp_online = ret;
4136 lttng_rb_set_hp_online(ret);
4137
4138 return 0;
4139}
4140
4141static void __exit lttng_exit_cpu_hotplug(void)
4142{
4143 lttng_rb_set_hp_online(0);
4144 cpuhp_remove_multi_state(lttng_hp_online);
4145 lttng_rb_set_hp_prepare(0);
4146 cpuhp_remove_multi_state(lttng_hp_prepare);
4147}
4148
5f4c791e 4149#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4150static int lttng_init_cpu_hotplug(void)
4151{
4152 return 0;
4153}
4154static void lttng_exit_cpu_hotplug(void)
4155{
4156}
5f4c791e 4157#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4158
a90917c3 4159static int __init lttng_events_init(void)
4e3c1b9b 4160{
1c25284c
MD		 4161 int ret;
4162
453b2495
JD		 4163 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4164 if (ret)
4165 return ret;
389d7070 4166 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4167 if (ret)
4168 return ret;
4169 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4170 if (ret)
4171 return ret;
4172 ret = lttng_probes_init();
389d7070
MD		 4173 if (ret)
4174 return ret;
07dfc1d0 4175 ret = lttng_context_init();
20591cf7
MD		 4176 if (ret)
4177 return ret;
07dfc1d0
MD		 4178 ret = lttng_tracepoint_init();
4179 if (ret)
4180 goto error_tp;
a67ba386
MD		 4181 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4182 if (!event_recorder_cache) {
20591cf7 4183 ret = -ENOMEM;
a67ba386 4184 goto error_kmem_event_recorder;
dffef45d 4185 }
a67ba386
MD		 4186 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4187 if (!event_recorder_private_cache) {
4188 ret = -ENOMEM;
4189 goto error_kmem_event_recorder_private;
4190 }
4191 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4192 if (!event_notifier_cache) {
4193 ret = -ENOMEM;
4194 goto error_kmem_event_notifier;
20591cf7 4195 }
a67ba386
MD		 4196 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4197 if (!event_notifier_private_cache) {
4198 ret = -ENOMEM;
4199 goto error_kmem_event_notifier_private;
4200 }
80996790 4201 ret = lttng_abi_init();
02119ee5
MD		 4202 if (ret)
4203 goto error_abi;
0c956676
MD		 4204 ret = lttng_logger_init();
4205 if (ret)
4206 goto error_logger;
1e367326
MD		 4207 ret = lttng_init_cpu_hotplug();
4208 if (ret)
4209 goto error_hotplug;
101215b7 4210 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4211 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4212 __stringify(LTTNG_MODULES_MINOR_VERSION),
4213 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4214 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4215 LTTNG_VERSION_NAME,
4216#ifdef LTTNG_EXTRA_VERSION_GIT
4217 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4218#else
4219 "",
4220#endif
4221#ifdef LTTNG_EXTRA_VERSION_NAME
4222 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4223#else
4224 "");
4225#endif
c1551e57
MJ		 4226#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4227 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4228#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4229 return 0;
0c956676 4230
1e367326
MD		 4231error_hotplug:
4232 lttng_logger_exit();
0c956676
MD		 4233error_logger:
4234 lttng_abi_exit();
02119ee5 4235error_abi:
a67ba386
MD		 4236 kmem_cache_destroy(event_notifier_private_cache);
4237error_kmem_event_notifier_private:
dffef45d
FD		 4238 kmem_cache_destroy(event_notifier_cache);
4239error_kmem_event_notifier:
a67ba386
MD		 4240 kmem_cache_destroy(event_recorder_private_cache);
4241error_kmem_event_recorder_private:
4242 kmem_cache_destroy(event_recorder_cache);
4243error_kmem_event_recorder:
20591cf7 4244 lttng_tracepoint_exit();
07dfc1d0
MD		 4245error_tp:
4246 lttng_context_exit();
101215b7 4247 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4248 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4249 __stringify(LTTNG_MODULES_MINOR_VERSION),
4250 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4251 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4252 LTTNG_VERSION_NAME,
4253#ifdef LTTNG_EXTRA_VERSION_GIT
4254 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4255#else
4256 "",
4257#endif
4258#ifdef LTTNG_EXTRA_VERSION_NAME
4259 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4260#else
4261 "");
4262#endif
1c25284c 4263 return ret;
4e3c1b9b
MD		 4264}
4265
a90917c3 4266module_init(lttng_events_init);
11b5a3c2 4267
a90917c3 4268static void __exit lttng_events_exit(void)
4e3c1b9b 4269{
8cdc1a81 4270 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4271
1e367326 4272 lttng_exit_cpu_hotplug();
0c956676 4273 lttng_logger_exit();
80996790 4274 lttng_abi_exit();
8cdc1a81
MD		 4275 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4276 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4277 kmem_cache_destroy(event_recorder_cache);
4278 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4279 kmem_cache_destroy(event_notifier_cache);
a67ba386 4280 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4281 lttng_tracepoint_exit();
07dfc1d0 4282 lttng_context_exit();
101215b7 4283 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4284 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4285 __stringify(LTTNG_MODULES_MINOR_VERSION),
4286 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4287 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4288 LTTNG_VERSION_NAME,
4289#ifdef LTTNG_EXTRA_VERSION_GIT
4290 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4291#else
4292 "",
4293#endif
4294#ifdef LTTNG_EXTRA_VERSION_NAME
4295 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4296#else
4297 "");
4298#endif
4e3c1b9b 4299}
92e94819 4300
a90917c3 4301module_exit(lttng_events_exit);
11b5a3c2 4302
7ca11e77 4303#include <generated/patches.h>
101215b7
MJ		 4304#ifdef LTTNG_EXTRA_VERSION_GIT
4305MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4306#endif
4307#ifdef LTTNG_EXTRA_VERSION_NAME
4308MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4309#endif
92e94819
MD		 4310MODULE_LICENSE("GPL and additional rights");
4311MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4312MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4313MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4314 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4315 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4316 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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