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Drop 'linux/file.h' wrapper
[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>
8c6e7f13 26#include <linux/uaccess.h>
a606b6e8 27#include <linux/vmalloc.h>
c88f762e 28#include <linux/dmi.h>
3c997079 29
c190d76e 30#include <wrapper/compiler_attributes.h>
a7008254 31#include <wrapper/uuid.h>
263b6c88 32#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 33#include <wrapper/random.h>
34#include <wrapper/tracepoint.h>
35#include <wrapper/list.h>
cbc19040 36#include <wrapper/types.h>
2df37e95
MD		 37#include <lttng/kernel-version.h>
38#include <lttng/events.h>
92bc1e23 39#include <lttng/events-internal.h>
0b365677 40#include <lttng/lttng-bytecode.h>
2df37e95 41#include <lttng/tracer.h>
21f58fb7 42#include <lttng/event-notifier-notification.h>
2df37e95
MD		 43#include <lttng/abi-old.h>
44#include <lttng/endian.h>
45#include <lttng/string-utils.h>
4a11ef1c 46#include <lttng/utils.h>
24591303
MD		 47#include <ringbuffer/backend.h>
48#include <ringbuffer/frontend.h>
3636085f 49#include <wrapper/time.h>
4e3c1b9b 50
5987e66c
MJ		 51#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0))
52#include <linux/stdarg.h>
53#else
54#include <stdarg.h>
55#endif
56
d83004aa
JD		 57#define METADATA_CACHE_DEFAULT_SIZE 4096
58
4e3c1b9b 59static LIST_HEAD(sessions);
750b05f2 60static LIST_HEAD(event_notifier_groups);
a90917c3 61static LIST_HEAD(lttng_transport_list);
a101fa10 62static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 63/*
64 * Protect the sessions and metadata caches.
65 */
4e3c1b9b 66static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 67static struct kmem_cache *event_recorder_cache;
68static struct kmem_cache *event_recorder_private_cache;
dffef45d 69static struct kmem_cache *event_notifier_cache;
a67ba386 70static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 71
8cdc1a81
MD		 72static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
73static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b01155ba 74static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
7b25ab0e 75static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
3c997079 76
0648898e 77static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
f7d06400 78static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
6a338ba4 79static void _lttng_event_unregister(struct lttng_kernel_event_common *event);
c099397a 80static
ee7e9a18 81int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event);
c099397a 82static
8cdc1a81 83int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 84static
85void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 86static
8cdc1a81 87int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 88 const struct lttng_kernel_type_common *type,
89 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 90 size_t nesting);
91static
8cdc1a81 92int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 93 const struct lttng_kernel_event_field *field,
51ef4536 94 size_t nesting, const char **prev_field_name_p);
c099397a 95
c099397a 96void synchronize_trace(void)
abcca994 97{
05355f0b
MJ		 98#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
99 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 100 synchronize_rcu();
101#else
abcca994 102 synchronize_sched();
92da05ce
MJ		 103#endif
104
5f4c791e 105#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 106#ifdef CONFIG_PREEMPT_RT_FULL
107 synchronize_rcu();
108#endif
5f4c791e 109#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 110#ifdef CONFIG_PREEMPT_RT
111 synchronize_rcu();
112#endif
5f4c791e 113#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 114}
115
3c997079
MD		 116void lttng_lock_sessions(void)
117{
118 mutex_lock(&sessions_mutex);
119}
120
121void lttng_unlock_sessions(void)
122{
123 mutex_unlock(&sessions_mutex);
124}
125
9fe593d2
FD		 126static struct lttng_transport *lttng_transport_find(const char *name)
127{
128 struct lttng_transport *transport;
129
130 list_for_each_entry(transport, &lttng_transport_list, node) {
131 if (!strcmp(transport->name, name))
132 return transport;
133 }
134 return NULL;
135}
136
3c997079
MD		 137/*
138 * Called with sessions lock held.
139 */
140int lttng_session_active(void)
141{
8cdc1a81 142 struct lttng_kernel_session_private *iter;
3c997079
MD		 143
144 list_for_each_entry(iter, &sessions, list) {
8cdc1a81 145 if (iter->pub->active)
3c997079
MD		 146 return 1;
147 }
148 return 0;
149}
150
8cdc1a81 151struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 152{
8cdc1a81
MD		 153 struct lttng_kernel_session *session;
154 struct lttng_kernel_session_private *session_priv;
d83004aa 155 struct lttng_metadata_cache *metadata_cache;
3c997079 156 int i;
4e3c1b9b
MD		 157
158 mutex_lock(&sessions_mutex);
8cdc1a81 159 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 160 if (!session)
d83004aa 161 goto err;
8cdc1a81
MD		 162 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
163 if (!session_priv)
164 goto err_free_session;
165 session->priv = session_priv;
166 session_priv->pub = session;
167
168 INIT_LIST_HEAD(&session_priv->chan);
169 INIT_LIST_HEAD(&session_priv->events);
170 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 171
172 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
173 GFP_KERNEL);
174 if (!metadata_cache)
8cdc1a81 175 goto err_free_session_private;
0ca42eb7 176 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 177 if (!metadata_cache->data)
178 goto err_free_cache;
179 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
180 kref_init(&metadata_cache->refcount);
92d9f5e6 181 mutex_init(&metadata_cache->lock);
8cdc1a81 182 session_priv->metadata_cache = metadata_cache;
d83004aa 183 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
8cdc1a81 184 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 185 sizeof(metadata_cache->uuid));
8cdc1a81 186 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 187 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
8cdc1a81
MD		 188 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
189 list_add(&session_priv->list, &sessions);
190
8c0393c3
MD		 191 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
192 goto tracker_alloc_error;
193 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
194 goto tracker_alloc_error;
195 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
196 goto tracker_alloc_error;
197 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
198 goto tracker_alloc_error;
199 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
200 goto tracker_alloc_error;
201 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
202 goto tracker_alloc_error;
203
4e3c1b9b 204 mutex_unlock(&sessions_mutex);
8cdc1a81 205
4e3c1b9b 206 return session;
d83004aa 207
8c0393c3
MD		 208tracker_alloc_error:
209 lttng_id_tracker_fini(&session->pid_tracker);
210 lttng_id_tracker_fini(&session->vpid_tracker);
211 lttng_id_tracker_fini(&session->uid_tracker);
212 lttng_id_tracker_fini(&session->vuid_tracker);
213 lttng_id_tracker_fini(&session->gid_tracker);
214 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 215err_free_cache:
216 kfree(metadata_cache);
8cdc1a81
MD		 217err_free_session_private:
218 lttng_kvfree(session_priv);
d83004aa 219err_free_session:
48f5e0b5 220 lttng_kvfree(session);
d83004aa
JD		 221err:
222 mutex_unlock(&sessions_mutex);
223 return NULL;
224}
225
99f52fcc
FD		 226static
227struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
228{
229 struct lttng_counter_transport *transport;
230
231 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
232 if (!strcmp(transport->name, name))
233 return transport;
234 }
235 return NULL;
236}
237
238struct lttng_counter *lttng_kernel_counter_create(
239 const char *counter_transport_name,
240 size_t number_dimensions, const size_t *dimensions_sizes)
241{
242 struct lttng_counter *counter = NULL;
243 struct lttng_counter_transport *counter_transport = NULL;
244
245 counter_transport = lttng_counter_transport_find(counter_transport_name);
246 if (!counter_transport) {
247 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
248 counter_transport_name);
249 goto notransport;
250 }
251 if (!try_module_get(counter_transport->owner)) {
252 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
253 goto notransport;
254 }
255
256 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
257 if (!counter)
258 goto nomem;
259
260 /* Create event notifier error counter. */
261 counter->ops = &counter_transport->ops;
262 counter->transport = counter_transport;
263
264 counter->counter = counter->ops->counter_create(
265 number_dimensions, dimensions_sizes, 0);
266 if (!counter->counter) {
267 goto create_error;
268 }
269
270 return counter;
271
272create_error:
273 lttng_kvfree(counter);
274nomem:
275 if (counter_transport)
276 module_put(counter_transport->owner);
277notransport:
278 return NULL;
279}
280
750b05f2
FD		 281struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
282{
283 struct lttng_transport *transport = NULL;
284 struct lttng_event_notifier_group *event_notifier_group;
285 const char *transport_name = "relay-event-notifier";
286 size_t subbuf_size = 4096; //TODO
287 size_t num_subbuf = 16; //TODO
288 unsigned int switch_timer_interval = 0;
289 unsigned int read_timer_interval = 0;
dffef45d 290 int i;
750b05f2
FD		 291
292 mutex_lock(&sessions_mutex);
293
294 transport = lttng_transport_find(transport_name);
295 if (!transport) {
296 printk(KERN_WARNING "LTTng: transport %s not found\n",
297 transport_name);
298 goto notransport;
299 }
300 if (!try_module_get(transport->owner)) {
301 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
302 transport_name);
303 goto notransport;
304 }
305
306 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
307 GFP_KERNEL);
308 if (!event_notifier_group)
309 goto nomem;
310
311 /*
312 * Initialize the ring buffer used to store event notifier
313 * notifications.
314 */
315 event_notifier_group->ops = &transport->ops;
4a399b76 316 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 317 transport_name, event_notifier_group, NULL,
318 subbuf_size, num_subbuf, switch_timer_interval,
319 read_timer_interval);
320 if (!event_notifier_group->chan)
321 goto create_error;
322
323 event_notifier_group->transport = transport;
dffef45d
FD		 324
325 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
326 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
33af697f
MD		 327 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
328 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
dffef45d 329
750b05f2
FD		 330 list_add(&event_notifier_group->node, &event_notifier_groups);
331
332 mutex_unlock(&sessions_mutex);
333
334 return event_notifier_group;
335
336create_error:
337 lttng_kvfree(event_notifier_group);
338nomem:
339 if (transport)
340 module_put(transport->owner);
341notransport:
342 mutex_unlock(&sessions_mutex);
343 return NULL;
344}
345
d83004aa
JD		 346void metadata_cache_destroy(struct kref *kref)
347{
348 struct lttng_metadata_cache *cache =
349 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 350 vfree(cache->data);
d83004aa 351 kfree(cache);
4e3c1b9b
MD		 352}
353
8cdc1a81 354void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 355{
f7d06400 356 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 357 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 358 struct lttng_metadata_stream *metadata_stream;
09710b83 359 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
dda6a249 360 int ret;
4e3c1b9b
MD		 361
362 mutex_lock(&sessions_mutex);
a8f2d0c7 363 WRITE_ONCE(session->active, 0);
f7d06400 364 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 365 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 366 WARN_ON(ret);
367 }
6a338ba4
MD		 368 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node)
369 _lttng_event_unregister(&event_recorder_priv->pub->parent);
abcca994 370 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400 371 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 372 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
badfe9f5
MD		 373 WARN_ON(ret);
374 }
09710b83
MD		 375 list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node)
376 lttng_event_enabler_destroy(event_enabler);
f237aef8 377 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node)
0648898e 378 _lttng_event_destroy(&event_recorder_priv->pub->parent);
f7d06400
MD		 379 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
380 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
381 _lttng_channel_destroy(chan_priv->pub);
d83004aa 382 }
8cdc1a81
MD		 383 mutex_lock(&session->priv->metadata_cache->lock);
384 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
d83004aa 385 _lttng_metadata_channel_hangup(metadata_stream);
8cdc1a81 386 mutex_unlock(&session->priv->metadata_cache->lock);
8c0393c3
MD		 387 lttng_id_tracker_fini(&session->pid_tracker);
388 lttng_id_tracker_fini(&session->vpid_tracker);
389 lttng_id_tracker_fini(&session->uid_tracker);
390 lttng_id_tracker_fini(&session->vuid_tracker);
391 lttng_id_tracker_fini(&session->gid_tracker);
392 lttng_id_tracker_fini(&session->vgid_tracker);
8cdc1a81
MD		 393 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
394 list_del(&session->priv->list);
4e3c1b9b 395 mutex_unlock(&sessions_mutex);
8cdc1a81 396 lttng_kvfree(session->priv);
48f5e0b5 397 lttng_kvfree(session);
4e3c1b9b
MD		 398}
399
dffef45d
FD		 400void lttng_event_notifier_group_destroy(
401 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 402{
09710b83 403 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
a67ba386 404 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 405 int ret;
406
750b05f2
FD		 407 if (!event_notifier_group)
408 return;
409
410 mutex_lock(&sessions_mutex);
dffef45d 411
6053e75e 412 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
8a8ac9a8
FD		 413 WARN_ON(ret);
414
a67ba386 415 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
6a338ba4
MD		 416 &event_notifier_group->event_notifiers_head, parent.node)
417 _lttng_event_unregister(&event_notifier_priv->pub->parent);
dffef45d 418
b01155ba
FD		 419 /* Wait for in-flight event notifier to complete */
420 synchronize_trace();
421
21f58fb7
FD		 422 irq_work_sync(&event_notifier_group->wakeup_pending);
423
6053e75e
MD		 424 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
425 WARN_ON(ret);
8a8ac9a8 426
09710b83 427 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
dffef45d 428 &event_notifier_group->enablers_head, node)
09710b83 429 lttng_event_enabler_destroy(event_enabler);
dffef45d 430
a67ba386 431 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 432 &event_notifier_group->event_notifiers_head, parent.node)
0648898e 433 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 434
99f52fcc
FD		 435 if (event_notifier_group->error_counter) {
436 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 437
99f52fcc
FD		 438 error_counter->ops->counter_destroy(error_counter->counter);
439 module_put(error_counter->transport->owner);
440 lttng_kvfree(error_counter);
441 event_notifier_group->error_counter = NULL;
442 }
443
4a399b76 444 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 445 module_put(event_notifier_group->transport->owner);
446 list_del(&event_notifier_group->node);
dffef45d 447
750b05f2
FD		 448 mutex_unlock(&sessions_mutex);
449 lttng_kvfree(event_notifier_group);
450}
451
8cdc1a81 452int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 453{
454 int ret;
455
456 mutex_lock(&sessions_mutex);
457 ret = lttng_statedump_start(session);
458 mutex_unlock(&sessions_mutex);
459 return ret;
460}
461
8cdc1a81 462int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 463{
464 int ret = 0;
f7d06400 465 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 466
467 mutex_lock(&sessions_mutex);
468 if (session->active) {
469 ret = -EBUSY;
470 goto end;
471 }
c099397a 472
3c997079 473 /* Set transient enabler state to "enabled" */
8cdc1a81 474 session->priv->tstate = 1;
3c997079 475
4ef81e4a 476 /* We need to sync enablers with session before activation. */
b2bc0bc8 477 lttng_session_sync_event_enablers(session);
4ef81e4a 478
c099397a
MD		 479 /*
480 * Snapshot the number of events per channel to know the type of header
481 * we need to use.
482 */
f7d06400
MD		 483 list_for_each_entry(chan_priv, &session->priv->chan, node) {
484 if (chan_priv->header_type)
485 continue; /* don't change it if session stop/restart */
486 if (chan_priv->free_event_id < 31)
487 chan_priv->header_type = 1; /* compact */
c099397a 488 else
f7d06400 489 chan_priv->header_type = 2; /* large */
c099397a
MD		 490 }
491
64af2437 492 /* Clear each stream's quiescent state. */
f7d06400
MD		 493 list_for_each_entry(chan_priv, &session->priv->chan, node) {
494 if (chan_priv->channel_type != METADATA_CHANNEL)
495 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 496 }
64af2437 497
a8f2d0c7 498 WRITE_ONCE(session->active, 1);
8cdc1a81 499 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 500 ret = _lttng_session_metadata_statedump(session);
c337ddc2 501 if (ret) {
a8f2d0c7 502 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 503 goto end;
504 }
505 ret = lttng_statedump_start(session);
360f38ea 506 if (ret)
a8f2d0c7 507 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 508end:
509 mutex_unlock(&sessions_mutex);
11b5a3c2 510 return ret;
c0e31d2e
MD		 511}
512
8cdc1a81 513int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 514{
515 int ret = 0;
f7d06400 516 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 517
518 mutex_lock(&sessions_mutex);
519 if (!session->active) {
520 ret = -EBUSY;
521 goto end;
522 }
a8f2d0c7 523 WRITE_ONCE(session->active, 0);
3c997079
MD		 524
525 /* Set transient enabler state to "disabled" */
8cdc1a81 526 session->priv->tstate = 0;
b2bc0bc8 527 lttng_session_sync_event_enablers(session);
64af2437
MD		 528
529 /* Set each stream's quiescent state. */
f7d06400
MD		 530 list_for_each_entry(chan_priv, &session->priv->chan, node) {
531 if (chan_priv->channel_type != METADATA_CHANNEL)
532 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 533 }
c0e31d2e
MD		 534end:
535 mutex_unlock(&sessions_mutex);
11b5a3c2 536 return ret;
c0e31d2e
MD		 537}
538
8cdc1a81 539int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 540{
541 int ret = 0;
f7d06400 542 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 543 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 544 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 545 struct lttng_metadata_stream *stream;
546
547 mutex_lock(&sessions_mutex);
548 if (!session->active) {
549 ret = -EBUSY;
550 goto end;
551 }
552
553 mutex_lock(&cache->lock);
554 memset(cache->data, 0, cache->cache_alloc);
555 cache->metadata_written = 0;
556 cache->version++;
8cdc1a81 557 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 558 stream->metadata_out = 0;
559 stream->metadata_in = 0;
560 }
561 mutex_unlock(&cache->lock);
562
8cdc1a81 563 session->priv->metadata_dumped = 0;
f7d06400
MD		 564 list_for_each_entry(chan_priv, &session->priv->chan, node) {
565 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 566 }
567
f237aef8 568 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386 569 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 570 }
571
572 ret = _lttng_session_metadata_statedump(session);
573
574end:
575 mutex_unlock(&sessions_mutex);
576 return ret;
577}
578
6b757027
MD		 579static
580bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
581{
582 struct lttng_kernel_channel_buffer *chan_buf;
583
584 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
585 return false;
586 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
587 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
588 return true;
589 return false;
590}
591
592int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
e64957da 593{
3c997079 594 int ret = 0;
e64957da 595
3c997079 596 mutex_lock(&sessions_mutex);
6b757027 597 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 598 ret = -EPERM;
599 goto end;
600 }
6b757027 601 if (channel->enabled) {
3c997079
MD		 602 ret = -EEXIST;
603 goto end;
604 }
605 /* Set transient enabler state to "enabled" */
6b757027
MD		 606 channel->priv->tstate = 1;
607 lttng_session_sync_event_enablers(channel->session);
3c997079 608 /* Set atomically the state to "enabled" */
6b757027 609 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 610end:
611 mutex_unlock(&sessions_mutex);
612 return ret;
e64957da
MD		 613}
614
6b757027 615int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
e64957da 616{
3c997079 617 int ret = 0;
e64957da 618
3c997079 619 mutex_lock(&sessions_mutex);
6b757027 620 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 621 ret = -EPERM;
622 goto end;
623 }
6b757027 624 if (!channel->enabled) {
3c997079
MD		 625 ret = -EEXIST;
626 goto end;
627 }
628 /* Set atomically the state to "disabled" */
6b757027 629 WRITE_ONCE(channel->enabled, 0);
3c997079 630 /* Set transient enabler state to "enabled" */
6b757027
MD		 631 channel->priv->tstate = 0;
632 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 633end:
634 mutex_unlock(&sessions_mutex);
635 return ret;
e64957da
MD		 636}
637
9d993668 638int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 639{
3c997079 640 int ret = 0;
e64957da 641
3c997079 642 mutex_lock(&sessions_mutex);
9d993668
MD		 643 switch (event->type) {
644 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
645 {
646 struct lttng_kernel_event_recorder *event_recorder =
647 container_of(event, struct lttng_kernel_event_recorder, parent);
648
f7d06400 649 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 650 ret = -EPERM;
651 goto end;
652 }
a0493bef 653 break;
9d993668
MD		 654 }
655 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
656 switch (event->priv->instrumentation) {
657 case LTTNG_KERNEL_ABI_KRETPROBE:
658 ret = -EINVAL;
659 goto end;
660 default:
661 break;
662 }
a0493bef
MD		 663 break;
664 default:
9d993668 665 break;
a0493bef 666 }
e64957da 667
9d993668 668 if (event->enabled) {
3c997079
MD		 669 ret = -EEXIST;
670 goto end;
671 }
a67ba386 672 switch (event->priv->instrumentation) {
c190d76e
MJ		 673 case LTTNG_KERNEL_ABI_TRACEPOINT:
674 lttng_fallthrough;
606828e4 675 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 676 ret = -EINVAL;
677 break;
b4a75708 678
c190d76e
MJ		 679 case LTTNG_KERNEL_ABI_KPROBE:
680 lttng_fallthrough;
606828e4 681 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 682 WRITE_ONCE(event->enabled, 1);
a0493bef 683 break;
b4a75708 684
606828e4 685 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 686 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 687 break;
b4a75708 688
c190d76e
MJ		 689 case LTTNG_KERNEL_ABI_FUNCTION:
690 lttng_fallthrough;
691 case LTTNG_KERNEL_ABI_NOOP:
692 lttng_fallthrough;
a0493bef
MD		 693 default:
694 WARN_ON_ONCE(1);
695 ret = -EINVAL;
696 }
3c997079
MD		 697end:
698 mutex_unlock(&sessions_mutex);
699 return ret;
e64957da
MD		 700}
701
9d993668 702int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 703{
704 int ret = 0;
705
706 mutex_lock(&sessions_mutex);
9d993668
MD		 707 switch (event->type) {
708 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
709 {
710 struct lttng_kernel_event_recorder *event_recorder =
711 container_of(event, struct lttng_kernel_event_recorder, parent);
712
f7d06400 713 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 714 ret = -EPERM;
715 goto end;
716 }
b01155ba 717 break;
9d993668
MD		 718 }
719 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
720 switch (event->priv->instrumentation) {
721 case LTTNG_KERNEL_ABI_KRETPROBE:
722 ret = -EINVAL;
723 goto end;
724 default:
725 break;
726 }
2b16f0c9 727 break;
dffef45d 728 default:
9d993668 729 break;
dffef45d 730 }
dffef45d 731
a67ba386 732 if (!event->enabled) {
dffef45d
FD		 733 ret = -EEXIST;
734 goto end;
735 }
a67ba386 736 switch (event->priv->instrumentation) {
c190d76e
MJ		 737 case LTTNG_KERNEL_ABI_TRACEPOINT:
738 lttng_fallthrough;
606828e4 739 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 740 ret = -EINVAL;
741 break;
b4a75708 742
c190d76e
MJ		 743 case LTTNG_KERNEL_ABI_KPROBE:
744 lttng_fallthrough;
606828e4 745 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 746 WRITE_ONCE(event->enabled, 0);
2b16f0c9 747 break;
b4a75708 748
9d993668
MD		 749 case LTTNG_KERNEL_ABI_KRETPROBE:
750 ret = lttng_kretprobes_event_enable_state(event, 0);
751 break;
752
c190d76e
MJ		 753 case LTTNG_KERNEL_ABI_FUNCTION:
754 lttng_fallthrough;
755 case LTTNG_KERNEL_ABI_NOOP:
756 lttng_fallthrough;
dffef45d
FD		 757 default:
758 WARN_ON_ONCE(1);
759 ret = -EINVAL;
760 }
761end:
762 mutex_unlock(&sessions_mutex);
763 return ret;
764}
765
4e252d1e 766struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 767 const char *transport_name,
768 void *buf_addr,
4e3c1b9b
MD		 769 size_t subbuf_size, size_t num_subbuf,
770 unsigned int switch_timer_interval,
d83004aa
JD		 771 unsigned int read_timer_interval,
772 enum channel_type channel_type)
4e3c1b9b 773{
f7d06400
MD		 774 struct lttng_kernel_channel_buffer *chan;
775 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 776 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 777
778 mutex_lock(&sessions_mutex);
8cdc1a81 779 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 780 goto active; /* Refuse to add channel to active session */
a90917c3 781 transport = lttng_transport_find(transport_name);
f3d01b96 782 if (!transport) {
5a15f70c 783 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 784 transport_name);
c0e31d2e 785 goto notransport;
f3d01b96 786 }
a33c9927 787 if (!try_module_get(transport->owner)) {
5a15f70c 788 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 789 goto notransport;
790 }
f7d06400 791 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 792 if (!chan)
c0e31d2e 793 goto nomem;
f7d06400
MD		 794 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
795 if (!chan_priv)
796 goto nomem_priv;
797 chan->priv = chan_priv;
798 chan_priv->pub = chan;
799 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
800 chan->parent.session = session;
801 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 802 chan->ops = &transport->ops;
125b4df4
MD		 803 /*
804 * Note: the channel creation op already writes into the packet
805 * headers. Therefore the "chan" information used as input
806 * should be already accessible.
807 */
f7d06400 808 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 809 chan, buf_addr, subbuf_size, num_subbuf,
810 switch_timer_interval, read_timer_interval);
f7d06400 811 if (!chan->priv->rb_chan)
f3d01b96 812 goto create_error;
f7d06400
MD		 813 chan->priv->parent.tstate = 1;
814 chan->parent.enabled = 1;
815 chan->priv->transport = transport;
816 chan->priv->channel_type = channel_type;
817 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 818 mutex_unlock(&sessions_mutex);
819 return chan;
820
f3d01b96 821create_error:
f7d06400
MD		 822 kfree(chan_priv);
823nomem_priv:
f3d01b96 824 kfree(chan);
c0e31d2e 825nomem:
a33c9927
MD		 826 if (transport)
827 module_put(transport->owner);
c0e31d2e 828notransport:
e5382b6d 829active:
4e3c1b9b
MD		 830 mutex_unlock(&sessions_mutex);
831 return NULL;
832}
833
834/*
d83004aa
JD		 835 * Only used internally at session destruction for per-cpu channels, and
836 * when metadata channel is released.
837 * Needs to be called with sessions mutex held.
4e3c1b9b 838 */
aa7c23a9 839static
f7d06400 840void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 841{
f7d06400
MD		 842 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
843 module_put(chan->priv->transport->owner);
844 list_del(&chan->priv->node);
845 lttng_kernel_destroy_context(chan->priv->ctx);
846 kfree(chan->priv);
4e3c1b9b
MD		 847 kfree(chan);
848}
849
f7d06400 850void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 851{
f7d06400 852 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 853
854 /* Protect the metadata cache with the sessions_mutex. */
855 mutex_lock(&sessions_mutex);
856 _lttng_channel_destroy(chan);
857 mutex_unlock(&sessions_mutex);
858}
859EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
860
861static
862void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
863{
864 stream->finalized = 1;
865 wake_up_interruptible(&stream->read_wait);
866}
867
51d248b5
MD		 868static
869bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler)
870{
871 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
872 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
873
874 switch (event_enabler->enabler_type) {
875 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
876 {
877 struct lttng_event_recorder_enabler *event_recorder_enabler =
878 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
879 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
880
881 switch (itype) {
882 case LTTNG_KERNEL_ABI_TRACEPOINT:
883 lttng_fallthrough;
884 case LTTNG_KERNEL_ABI_KPROBE:
885 lttng_fallthrough;
886 case LTTNG_KERNEL_ABI_SYSCALL:
887 lttng_fallthrough;
888 case LTTNG_KERNEL_ABI_UPROBE:
889 if (chan->priv->free_event_id == -1U)
890 return false;
891 return true;
892 case LTTNG_KERNEL_ABI_KRETPROBE:
893 /* kretprobes require 2 event IDs. */
894 if (chan->priv->free_event_id >= -2U)
895 return false;
896 return true;
897 default:
898 WARN_ON_ONCE(1);
899 return false;
900 }
901 }
902 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
903 return true;
904 default:
905 WARN_ON_ONCE(1);
906 return false;
907 }
908}
909
756a020c
MD		 910static
911struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler)
912{
913 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
914 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
915
916 switch (event_enabler->enabler_type) {
917 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
918 {
919 struct lttng_event_recorder_enabler *event_recorder_enabler =
920 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
921 struct lttng_kernel_event_recorder *event_recorder;
922 struct lttng_kernel_event_recorder_private *event_recorder_priv;
923 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
924
925 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
926 if (!event_recorder)
927 return NULL;
928 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
929 if (!event_recorder_priv) {
930 kmem_cache_free(event_recorder_private_cache, event_recorder);
931 return NULL;
932 }
933 event_recorder_priv->pub = event_recorder;
934 event_recorder_priv->parent.pub = &event_recorder->parent;
935 event_recorder->priv = event_recorder_priv;
936 event_recorder->parent.priv = &event_recorder_priv->parent;
937
938 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
939 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
940 event_recorder->priv->parent.instrumentation = itype;
941 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
942 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
943
944 event_recorder->chan = chan;
945 event_recorder->priv->id = chan->priv->free_event_id++;
946 return &event_recorder->parent;
947 }
948 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
949 {
950 struct lttng_event_notifier_enabler *event_notifier_enabler =
951 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
952 struct lttng_kernel_event_notifier *event_notifier;
953 struct lttng_kernel_event_notifier_private *event_notifier_priv;
954
955 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
956 if (!event_notifier)
957 return NULL;
958 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
959 if (!event_notifier_priv) {
960 kmem_cache_free(event_notifier_private_cache, event_notifier);
961 return NULL;
962 }
963 event_notifier_priv->pub = event_notifier;
964 event_notifier_priv->parent.pub = &event_notifier->parent;
965 event_notifier->priv = event_notifier_priv;
966 event_notifier->parent.priv = &event_notifier_priv->parent;
967
968 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
969 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
970 event_notifier->priv->parent.instrumentation = itype;
971 event_notifier->priv->parent.user_token = event_enabler->user_token;
972 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
973 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
974
975 event_notifier->priv->group = event_notifier_enabler->group;
976 event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index;
977 event_notifier->priv->num_captures = 0;
978 event_notifier->notification_send = lttng_event_notifier_notification_send;
979 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
980 return &event_notifier->parent;
981 }
982 default:
983 return NULL;
984 }
985}
986
987static
988void lttng_kernel_event_free(struct lttng_kernel_event_common *event)
989{
990 switch (event->type) {
991 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
992 {
993 struct lttng_kernel_event_recorder *event_recorder =
994 container_of(event, struct lttng_kernel_event_recorder, parent);
995
996 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
997 kmem_cache_free(event_recorder_cache, event_recorder);
998 break;
999 }
1000 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1001 {
1002 struct lttng_kernel_event_notifier *event_notifier =
1003 container_of(event, struct lttng_kernel_event_notifier, parent);
1004
1005 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1006 kmem_cache_free(event_notifier_cache, event_notifier);
1007 break;
1008 }
1009 default:
1010 WARN_ON_ONCE(1);
1011 }
1012}
a101fa10 1013
ccefc7ab
MD		 1014static
1015int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event)
1016{
1017 switch (event->type) {
1018 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1019 return 0;
1020 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1021 {
1022 struct lttng_kernel_event_notifier *event_notifier =
1023 container_of(event, struct lttng_kernel_event_notifier, parent);
1024 struct lttng_counter *error_counter;
1025 struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group;
1026 size_t dimension_index[1];
1027 int ret;
1028
1029 /*
1030 * Clear the error counter bucket. The sessiond keeps track of which
1031 * bucket is currently in use. We trust it. The session lock
1032 * synchronizes against concurrent creation of the error
1033 * counter.
1034 */
1035 error_counter = event_notifier_group->error_counter;
1036 if (!error_counter)
1037 return 0;
1038 /*
1039 * Check that the index is within the boundary of the counter.
1040 */
1041 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
1042 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1043 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1044 return -EINVAL;
1045 }
1046
1047 dimension_index[0] = event_notifier->priv->error_counter_index;
1048 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1049 if (ret) {
1050 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1051 event_notifier->priv->error_counter_index);
1052 return -EINVAL;
1053 }
1054 return 0;
1055 }
1056 default:
1057 return -EINVAL;
1058 }
1059}
1060
e5382b6d
MD		 1061/*
1062 * Supports event creation while tracing session is active.
3c997079 1063 * Needs to be called with sessions mutex held.
e5382b6d 1064 */
13a2dfca 1065struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
def1e304 1066 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 1067{
13a2dfca
MD		 1068 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
1069 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
1070 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
def1e304 1071 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1072 struct lttng_kernel_event_common_private *event_priv;
756a020c 1073 struct lttng_kernel_event_common *event;
3c997079
MD		 1074 const char *event_name;
1075 struct hlist_head *head;
3d084699 1076 int ret;
4e3c1b9b 1077
13a2dfca 1078 if (!lttng_kernel_event_id_available(event_enabler)) {
4cf0bf51 1079 ret = -EMFILE;
e5382b6d 1080 goto full;
abc0446a 1081 }
3c997079
MD		 1082
1083 switch (itype) {
606828e4 1084 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1085 event_name = event_desc->event_name;
3c997079 1086 break;
b4a75708 1087
c190d76e
MJ		 1088 case LTTNG_KERNEL_ABI_KPROBE:
1089 lttng_fallthrough;
1090 case LTTNG_KERNEL_ABI_UPROBE:
1091 lttng_fallthrough;
1092 case LTTNG_KERNEL_ABI_KRETPROBE:
1093 lttng_fallthrough;
606828e4 1094 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 1095 event_name = event_param->name;
1096 break;
b4a75708 1097
c190d76e
MJ		 1098 case LTTNG_KERNEL_ABI_FUNCTION:
1099 lttng_fallthrough;
1100 case LTTNG_KERNEL_ABI_NOOP:
1101 lttng_fallthrough;
3c997079
MD		 1102 default:
1103 WARN_ON_ONCE(1);
1104 ret = -EINVAL;
1105 goto type_error;
1106 }
4a11ef1c 1107
0def9170 1108 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1109 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
13a2dfca 1110 if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) {
3c997079
MD		 1111 ret = -EEXIST;
1112 goto exist;
abc0446a
MD		 1113 }
1114 }
3c997079 1115
13a2dfca 1116 event = lttng_kernel_event_alloc(event_enabler);
756a020c 1117 if (!event) {
4cf0bf51 1118 ret = -ENOMEM;
756a020c 1119 goto alloc_error;
abc0446a 1120 }
3c997079
MD		 1121
1122 switch (itype) {
606828e4 1123 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 1124 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1125 event->enabled = 0;
1126 event->priv->registered = 0;
1127 event->priv->desc = lttng_event_desc_get(event_name);
1128 if (!event->priv->desc) {
4cf0bf51 1129 ret = -ENOENT;
d3dbe23c 1130 goto register_error;
abc0446a 1131 }
3c997079
MD		 1132 /* Populate lttng_event structure before event registration. */
1133 smp_wmb();
baf20995 1134 break;
b4a75708 1135
606828e4 1136 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 1137 /*
1138 * Needs to be explicitly enabled after creation, since
1139 * we may want to apply filters.
1140 */
7cd0f696
MD		 1141 event->enabled = 0;
1142 event->priv->registered = 1;
3c997079
MD		 1143 /*
1144 * Populate lttng_event structure before event
1145 * registration.
1146 */
1147 smp_wmb();
8bf17deb 1148 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 1149 event_param->u.kprobe.symbol_name,
1150 event_param->u.kprobe.offset,
1151 event_param->u.kprobe.addr,
7cd0f696 1152 event);
abc0446a 1153 if (ret) {
4cf0bf51 1154 ret = -EINVAL;
d6d808f3 1155 goto register_error;
abc0446a 1156 }
7cd0f696 1157 ret = try_module_get(event->priv->desc->owner);
edeb3137 1158 WARN_ON_ONCE(!ret);
d6d808f3 1159 break;
b4a75708 1160
606828e4 1161 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 1162 {
756a020c 1163 struct lttng_kernel_event_common *event_return;
7371f44c
MD		 1164
1165 /* kretprobe defines 2 events */
a0493bef
MD		 1166 /*
1167 * Needs to be explicitly enabled after creation, since
1168 * we may want to apply filters.
1169 */
756a020c
MD		 1170 event->enabled = 0;
1171 event->priv->registered = 1;
a67ba386 1172
13a2dfca 1173 event_return = lttng_kernel_event_alloc(event_enabler);
756a020c 1174 if (!event) {
a67ba386 1175 ret = -ENOMEM;
756a020c 1176 goto alloc_error;
a67ba386 1177 }
756a020c
MD		 1178
1179 event_return->enabled = 0;
1180 event_return->priv->registered = 1;
1181
7371f44c 1182 /*
a90917c3 1183 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1184 */
1185 smp_wmb();
3c997079 1186 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1187 event_param->u.kretprobe.symbol_name,
1188 event_param->u.kretprobe.offset,
1189 event_param->u.kretprobe.addr,
756a020c 1190 event, event_return);
7371f44c 1191 if (ret) {
756a020c 1192 lttng_kernel_event_free(event_return);
4cf0bf51 1193 ret = -EINVAL;
7371f44c
MD		 1194 goto register_error;
1195 }
1196 /* Take 2 refs on the module: one per event. */
756a020c 1197 ret = try_module_get(event->priv->desc->owner);
7371f44c 1198 WARN_ON_ONCE(!ret);
756a020c 1199 ret = try_module_get(event_return->priv->desc->owner);
7371f44c 1200 WARN_ON_ONCE(!ret);
ee7e9a18 1201 ret = _lttng_event_recorder_metadata_statedump(event_return);
abc0446a 1202 WARN_ON_ONCE(ret > 0);
7371f44c 1203 if (ret) {
756a020c 1204 lttng_kernel_event_free(event_return);
7cd0f696
MD		 1205 module_put(event_return->priv->desc->owner);
1206 module_put(event->priv->desc->owner);
7371f44c
MD		 1207 goto statedump_error;
1208 }
19b98250 1209 list_add(&event_return->priv->node, event_list_head);
7371f44c
MD		 1210 break;
1211 }
b4a75708 1212
606828e4 1213 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1214 /*
1215 * Needs to be explicitly enabled after creation, since
1216 * we may want to apply filters.
1217 */
7cd0f696
MD		 1218 event->enabled = 0;
1219 event->priv->registered = 0;
1220 event->priv->desc = event_desc;
badfe9f5 1221 switch (event_param->u.syscall.entryexit) {
606828e4 1222 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1223 ret = -EINVAL;
1224 goto register_error;
606828e4 1225 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1226 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1227 break;
606828e4 1228 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1229 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1230 break;
1231 }
1232 switch (event_param->u.syscall.abi) {
606828e4 1233 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1234 ret = -EINVAL;
1235 goto register_error;
606828e4 1236 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1237 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1238 break;
606828e4 1239 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1240 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1241 break;
1242 }
7cd0f696 1243 if (!event->priv->desc) {
4cf0bf51 1244 ret = -EINVAL;
259b6cb3 1245 goto register_error;
abc0446a 1246 }
1ec65de1 1247 break;
b4a75708 1248
606828e4 1249 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1250 /*
1251 * Needs to be explicitly enabled after creation, since
1252 * we may want to apply filters.
1253 */
7cd0f696
MD		 1254 event->enabled = 0;
1255 event->priv->registered = 1;
3aed4dca 1256
a344f64b
FD		 1257 /*
1258 * Populate lttng_event structure before event
1259 * registration.
1260 */
1261 smp_wmb();
149b9a9d 1262
83b802dc 1263 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1264 event_param->u.uprobe.fd,
7cd0f696 1265 event);
149b9a9d
YB		 1266 if (ret)
1267 goto register_error;
7cd0f696 1268 ret = try_module_get(event->priv->desc->owner);
149b9a9d
YB		 1269 WARN_ON_ONCE(!ret);
1270 break;
b4a75708 1271
baf20995
MD		 1272 default:
1273 WARN_ON_ONCE(1);
4cf0bf51 1274 ret = -EINVAL;
df07930b 1275 goto register_error;
baf20995 1276 }
13a2dfca 1277
ee7e9a18 1278 ret = _lttng_event_recorder_metadata_statedump(event);
abc0446a
MD		 1279 WARN_ON_ONCE(ret > 0);
1280 if (ret) {
c099397a 1281 goto statedump_error;
abc0446a 1282 }
dffef45d 1283
ccefc7ab
MD		 1284 ret = lttng_kernel_event_notifier_clear_error_counter(event);
1285 if (ret)
1286 goto register_error;
c4e31059 1287
c4e31059 1288 hlist_add_head(&event->priv->hlist_node, head);
13a2dfca 1289 list_add(&event->priv->node, event_list_head);
c4e31059 1290
13a2dfca 1291 return event;
dffef45d 1292
13a2dfca
MD		 1293statedump_error:
1294 /* If a statedump error occurs, events will not be readable. */
dffef45d 1295register_error:
756a020c
MD		 1296 lttng_kernel_event_free(event);
1297alloc_error:
dffef45d
FD		 1298exist:
1299type_error:
13a2dfca 1300full:
dffef45d
FD		 1301 return ERR_PTR(ret);
1302}
1303
83006ee0
MD		 1304struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1305 const struct lttng_kernel_event_desc *event_desc)
1306{
1307 struct lttng_kernel_event_common *event;
1308
1309 mutex_lock(&sessions_mutex);
1310 event = _lttng_kernel_event_create(event_enabler, event_desc);
1311 mutex_unlock(&sessions_mutex);
1312 return event;
1313}
1314
99f52fcc
FD		 1315int lttng_kernel_counter_read(struct lttng_counter *counter,
1316 const size_t *dim_indexes, int32_t cpu,
1317 int64_t *val, bool *overflow, bool *underflow)
1318{
1319 return counter->ops->counter_read(counter->counter, dim_indexes,
1320 cpu, val, overflow, underflow);
1321}
1322
1323int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1324 const size_t *dim_indexes, int64_t *val,
1325 bool *overflow, bool *underflow)
1326{
1327 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1328 val, overflow, underflow);
1329}
1330
1331int lttng_kernel_counter_clear(struct lttng_counter *counter,
1332 const size_t *dim_indexes)
1333{
1334 return counter->ops->counter_clear(counter->counter, dim_indexes);
1335}
1336
6a338ba4 1337/* Only used for tracepoints and system calls for now. */
3c997079 1338static
0c851fa0 1339void register_event(struct lttng_kernel_event_common *event)
3c997079 1340{
437d5aa5 1341 const struct lttng_kernel_event_desc *desc;
f127e61e 1342 int ret = -EINVAL;
3c997079 1343
6a338ba4 1344 WARN_ON_ONCE(event->priv->registered);
4ecb5ad5 1345
0c851fa0
MD		 1346 desc = event->priv->desc;
1347 switch (event->priv->instrumentation) {
606828e4 1348 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1349 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1350 desc->tp_class->probe_callback,
0c851fa0 1351 event);
4ecb5ad5 1352 break;
b4a75708 1353
606828e4 1354 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1355 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1356 break;
b4a75708 1357
c190d76e
MJ		 1358 case LTTNG_KERNEL_ABI_KPROBE:
1359 lttng_fallthrough;
1360 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1361 ret = 0;
f0bcc14c 1362 break;
0c851fa0
MD		 1363
1364 case LTTNG_KERNEL_ABI_KRETPROBE:
1365 switch (event->type) {
1366 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1367 ret = 0;
1368 break;
1369 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1370 WARN_ON_ONCE(1);
1371 break;
1372 }
4ecb5ad5 1373 break;
b4a75708 1374
c190d76e
MJ		 1375 case LTTNG_KERNEL_ABI_FUNCTION:
1376 lttng_fallthrough;
1377 case LTTNG_KERNEL_ABI_NOOP:
1378 lttng_fallthrough;
4ecb5ad5
MD		 1379 default:
1380 WARN_ON_ONCE(1);
1381 }
6a338ba4 1382 WARN_ON_ONCE(ret);
3c997079 1383 if (!ret)
0c851fa0 1384 event->priv->registered = 1;
3c997079
MD		 1385}
1386
6a338ba4
MD		 1387static
1388void unregister_event(struct lttng_kernel_event_common *event)
4e3c1b9b 1389{
f0bcc14c 1390 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1391 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1392 int ret = -EINVAL;
1393
6a338ba4 1394 WARN_ON_ONCE(!event->priv->registered);
3c997079 1395
a67ba386
MD		 1396 desc = event_priv->desc;
1397 switch (event_priv->instrumentation) {
606828e4 1398 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1399 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1400 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1401 event);
baf20995 1402 break;
b4a75708 1403
606828e4 1404 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1405 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1406 ret = 0;
1407 break;
b4a75708 1408
606828e4 1409 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1410 switch (event->type) {
1411 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1412 lttng_kretprobes_unregister(event);
1413 ret = 0;
1414 break;
1415 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1416 WARN_ON_ONCE(1);
1417 break;
1418 }
7371f44c 1419 break;
b4a75708 1420
606828e4 1421 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1422 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1423 break;
b4a75708 1424
606828e4 1425 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1426 switch (event->type) {
1427 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1428 ret = 0;
1429 break;
1430 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1431 WARN_ON_ONCE(1);
1432 break;
1433 }
259b6cb3 1434 break;
b4a75708 1435
606828e4 1436 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1437 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1438 ret = 0;
1439 break;
b4a75708 1440
c190d76e
MJ		 1441 case LTTNG_KERNEL_ABI_FUNCTION:
1442 lttng_fallthrough;
baf20995
MD		 1443 default:
1444 WARN_ON_ONCE(1);
1445 }
6a338ba4 1446 WARN_ON_ONCE(ret);
3c997079 1447 if (!ret)
a67ba386 1448 event_priv->registered = 0;
6a338ba4
MD		 1449}
1450
1451static
1452void _lttng_event_unregister(struct lttng_kernel_event_common *event)
1453{
1454 if (event->priv->registered)
1455 unregister_event(event);
dda6a249
MD		 1456}
1457
1458/*
1459 * Only used internally at session destruction.
1460 */
be066e6c 1461static
0648898e 1462void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1463{
0648898e 1464 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1465 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1466
0648898e
MD		 1467 lttng_free_event_filter_runtime(event);
1468 /* Free event enabler refs */
1469 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1470 &event_priv->enablers_ref_head, node)
1471 kfree(enabler_ref);
b4a75708 1472
0648898e
MD		 1473 switch (event->type) {
1474 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1475 {
1476 struct lttng_kernel_event_recorder *event_recorder =
1477 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1478
0648898e
MD		 1479 switch (event_priv->instrumentation) {
1480 case LTTNG_KERNEL_ABI_TRACEPOINT:
1481 lttng_event_desc_put(event_priv->desc);
1482 break;
b4a75708 1483
0648898e
MD		 1484 case LTTNG_KERNEL_ABI_KPROBE:
1485 module_put(event_priv->desc->owner);
6a35e5bd 1486 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1487 break;
b4a75708 1488
0648898e
MD		 1489 case LTTNG_KERNEL_ABI_KRETPROBE:
1490 module_put(event_priv->desc->owner);
eb6b47db 1491 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1492 break;
b4a75708 1493
0648898e
MD		 1494 case LTTNG_KERNEL_ABI_SYSCALL:
1495 break;
4e3c1b9b 1496
0648898e
MD		 1497 case LTTNG_KERNEL_ABI_UPROBE:
1498 module_put(event_priv->desc->owner);
17806c46 1499 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1500 break;
3ef5cc03 1501
c190d76e
MJ		 1502 case LTTNG_KERNEL_ABI_FUNCTION:
1503 lttng_fallthrough;
1504 case LTTNG_KERNEL_ABI_NOOP:
1505 lttng_fallthrough;
0648898e
MD		 1506 default:
1507 WARN_ON_ONCE(1);
1508 }
f237aef8 1509 list_del(&event_recorder->priv->parent.node);
0648898e
MD		 1510 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1511 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1512 break;
0648898e
MD		 1513 }
1514 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1515 {
1516 struct lttng_kernel_event_notifier *event_notifier =
1517 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1518
0648898e
MD		 1519 switch (event_notifier->priv->parent.instrumentation) {
1520 case LTTNG_KERNEL_ABI_TRACEPOINT:
1521 lttng_event_desc_put(event_notifier->priv->parent.desc);
1522 break;
b4a75708 1523
0648898e
MD		 1524 case LTTNG_KERNEL_ABI_KPROBE:
1525 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1526 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1527 break;
b4a75708 1528
0648898e
MD		 1529 case LTTNG_KERNEL_ABI_SYSCALL:
1530 break;
b4a75708 1531
0648898e
MD		 1532 case LTTNG_KERNEL_ABI_UPROBE:
1533 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1534 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1535 break;
1536
c190d76e
MJ		 1537 case LTTNG_KERNEL_ABI_KRETPROBE:
1538 lttng_fallthrough;
1539 case LTTNG_KERNEL_ABI_FUNCTION:
1540 lttng_fallthrough;
1541 case LTTNG_KERNEL_ABI_NOOP:
1542 lttng_fallthrough;
0648898e
MD		 1543 default:
1544 WARN_ON_ONCE(1);
1545 }
f237aef8 1546 list_del(&event_notifier->priv->parent.node);
0648898e
MD		 1547 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1548 kmem_cache_free(event_notifier_cache, event_notifier);
1549 break;
1550 }
dffef45d
FD		 1551 default:
1552 WARN_ON_ONCE(1);
1553 }
dffef45d
FD		 1554}
1555
8c0393c3 1556struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1557 enum tracker_type tracker_type)
e0130fab 1558{
d1f652f8
MD		 1559 switch (tracker_type) {
1560 case TRACKER_PID:
1561 return &session->pid_tracker;
1562 case TRACKER_VPID:
1563 return &session->vpid_tracker;
1564 case TRACKER_UID:
1565 return &session->uid_tracker;
1566 case TRACKER_VUID:
1567 return &session->vuid_tracker;
1568 case TRACKER_GID:
1569 return &session->gid_tracker;
1570 case TRACKER_VGID:
1571 return &session->vgid_tracker;
1572 default:
1573 WARN_ON_ONCE(1);
1574 return NULL;
1575 }
1576}
1577
8cdc1a81 1578int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1579 enum tracker_type tracker_type, int id)
1580{
8c0393c3 1581 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1582 int ret;
1583
d1f652f8
MD		 1584 tracker = get_tracker(session, tracker_type);
1585 if (!tracker)
1586 return -EINVAL;
1587 if (id < -1)
e0130fab
MD		 1588 return -EINVAL;
1589 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1590 if (id == -1) {
1591 /* track all ids: destroy tracker. */
1592 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1593 ret = 0;
1594 } else {
d1f652f8 1595 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1596 }
e0130fab
MD		 1597 mutex_unlock(&sessions_mutex);
1598 return ret;
1599}
1600
8cdc1a81 1601int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1602 enum tracker_type tracker_type, int id)
e0130fab 1603{
8c0393c3 1604 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1605 int ret;
1606
d1f652f8
MD		 1607 tracker = get_tracker(session, tracker_type);
1608 if (!tracker)
1609 return -EINVAL;
1610 if (id < -1)
e0130fab
MD		 1611 return -EINVAL;
1612 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1613 if (id == -1) {
1614 /* untrack all ids: replace by empty tracker. */
1615 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1616 } else {
d1f652f8 1617 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1618 }
e0130fab
MD		 1619 mutex_unlock(&sessions_mutex);
1620 return ret;
1621}
1622
7e6f9ef6 1623static
d1f652f8 1624void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1625{
8c0393c3
MD		 1626 struct lttng_kernel_id_tracker *id_tracker = m->private;
1627 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1628 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1629 int iter = 0, i;
1630
1631 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1632 if (id_tracker_p) {
1633 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1634 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1635
f934e302 1636 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1637 if (iter++ >= *pos)
1638 return e;
1639 }
1640 }
1641 } else {
d1f652f8 1642 /* ID tracker disabled. */
7e6f9ef6 1643 if (iter >= *pos && iter == 0) {
d1f652f8 1644 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1645 }
1646 iter++;
1647 }
1648 /* End of list */
1649 return NULL;
1650}
1651
1652/* Called with sessions_mutex held. */
1653static
d1f652f8 1654void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1655{
8c0393c3
MD		 1656 struct lttng_kernel_id_tracker *id_tracker = m->private;
1657 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1658 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1659 int iter = 0, i;
1660
1661 (*ppos)++;
d1f652f8
MD		 1662 if (id_tracker_p) {
1663 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1664 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1665
f934e302 1666 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1667 if (iter++ >= *ppos)
1668 return e;
1669 }
1670 }
1671 } else {
d1f652f8 1672 /* ID tracker disabled. */
7e6f9ef6 1673 if (iter >= *ppos && iter == 0)
d1f652f8 1674 return p; /* empty tracker */
7e6f9ef6
MD		 1675 iter++;
1676 }
1677
1678 /* End of list */
1679 return NULL;
1680}
1681
1682static
d1f652f8 1683void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1684{
1685 mutex_unlock(&sessions_mutex);
1686}
1687
1688static
d1f652f8 1689int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1690{
8c0393c3
MD		 1691 struct lttng_kernel_id_tracker *id_tracker = m->private;
1692 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1693 int id;
7e6f9ef6 1694
d1f652f8 1695 if (p == id_tracker_p) {
7e6f9ef6 1696 /* Tracker disabled. */
d1f652f8 1697 id = -1;
7e6f9ef6 1698 } else {
d1f652f8 1699 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1700
d1f652f8
MD		 1701 id = lttng_id_tracker_get_node_id(e);
1702 }
8c0393c3 1703 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1704 case TRACKER_PID:
1705 seq_printf(m, "process { pid = %d; };\n", id);
1706 break;
1707 case TRACKER_VPID:
1708 seq_printf(m, "process { vpid = %d; };\n", id);
1709 break;
1710 case TRACKER_UID:
1711 seq_printf(m, "user { uid = %d; };\n", id);
1712 break;
1713 case TRACKER_VUID:
1714 seq_printf(m, "user { vuid = %d; };\n", id);
1715 break;
1716 case TRACKER_GID:
1717 seq_printf(m, "group { gid = %d; };\n", id);
1718 break;
1719 case TRACKER_VGID:
1720 seq_printf(m, "group { vgid = %d; };\n", id);
1721 break;
1722 default:
1723 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1724 }
7e6f9ef6
MD		 1725 return 0;
1726}
1727
1728static
d1f652f8
MD		 1729const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1730 .start = id_list_start,
1731 .next = id_list_next,
1732 .stop = id_list_stop,
1733 .show = id_list_show,
7e6f9ef6
MD		 1734};
1735
1736static
d1f652f8 1737int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1738{
d1f652f8 1739 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1740}
1741
1742static
d1f652f8 1743int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1744{
1745 struct seq_file *m = file->private_data;
8c0393c3 1746 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1747 int ret;
1748
d1f652f8 1749 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1750 ret = seq_release(inode, file);
d1f652f8 1751 if (!ret)
8c0393c3 1752 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1753 return ret;
1754}
1755
d1f652f8 1756const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1757 .owner = THIS_MODULE,
d1f652f8 1758 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1759 .read = seq_read,
1760 .llseek = seq_lseek,
d1f652f8 1761 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1762};
1763
8cdc1a81 1764int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1765 enum tracker_type tracker_type)
7e6f9ef6 1766{
d1f652f8 1767 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1768 struct seq_file *m;
1769 int file_fd, ret;
1770
2a059b14 1771 file_fd = get_unused_fd_flags(0);
7e6f9ef6
MD		 1772 if (file_fd < 0) {
1773 ret = file_fd;
1774 goto fd_error;
1775 }
1776
d1f652f8
MD		 1777 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1778 &lttng_tracker_ids_list_fops,
7e6f9ef6 1779 NULL, O_RDWR);
d1f652f8
MD		 1780 if (IS_ERR(tracker_ids_list_file)) {
1781 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1782 goto file_error;
1783 }
8cdc1a81 1784 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1785 ret = -EOVERFLOW;
9c1f4643
MD		 1786 goto refcount_error;
1787 }
d1f652f8 1788 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1789 if (ret < 0)
1790 goto open_error;
d1f652f8
MD		 1791 m = tracker_ids_list_file->private_data;
1792
1793 m->private = get_tracker(session, tracker_type);
1794 BUG_ON(!m->private);
1795 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1796
1797 return file_fd;
1798
1799open_error:
8cdc1a81 1800 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1801refcount_error:
d1f652f8 1802 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1803file_error:
1804 put_unused_fd(file_fd);
1805fd_error:
1806 return ret;
1807}
1808
3c997079
MD		 1809/*
1810 * Enabler management.
1811 */
1812static
4993071a
PP		 1813int lttng_match_enabler_star_glob(const char *desc_name,
1814 const char *pattern)
3c997079 1815{
cbc19040
MD		 1816 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1817 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1818 return 0;
1819 return 1;
1820}
1821
1822static
4ecb5ad5
MD		 1823int lttng_match_enabler_name(const char *desc_name,
1824 const char *name)
3c997079 1825{
4ecb5ad5 1826 if (strcmp(desc_name, name))
3c997079
MD		 1827 return 0;
1828 return 1;
1829}
1830
8bff0fc3
MD		 1831static
1832int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
8d554755 1833 struct lttng_event_enabler_common *enabler)
3c997079 1834{
4ecb5ad5 1835 const char *desc_name, *enabler_name;
badfe9f5 1836 bool compat = false, entry = false;
4ecb5ad5
MD		 1837
1838 enabler_name = enabler->event_param.name;
1839 switch (enabler->event_param.instrumentation) {
606828e4 1840 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1841 desc_name = desc->event_name;
3b861b22
FD		 1842 switch (enabler->format_type) {
1843 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1844 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1845 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1846 return lttng_match_enabler_name(desc_name, enabler_name);
1847 default:
1848 return -EINVAL;
1849 }
4ecb5ad5 1850 break;
b4a75708 1851
606828e4 1852 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1853 desc_name = desc->event_name;
badfe9f5 1854 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1855 desc_name += strlen("compat_");
badfe9f5
MD		 1856 compat = true;
1857 }
4ecb5ad5
MD		 1858 if (!strncmp(desc_name, "syscall_exit_",
1859 strlen("syscall_exit_"))) {
1860 desc_name += strlen("syscall_exit_");
1861 } else if (!strncmp(desc_name, "syscall_entry_",
1862 strlen("syscall_entry_"))) {
1863 desc_name += strlen("syscall_entry_");
badfe9f5 1864 entry = true;
4ecb5ad5
MD		 1865 } else {
1866 WARN_ON_ONCE(1);
1867 return -EINVAL;
1868 }
badfe9f5 1869 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1870 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1871 break;
606828e4 1872 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1873 if (!entry)
1874 return 0;
1875 break;
606828e4 1876 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1877 if (entry)
1878 return 0;
1879 break;
1880 default:
1881 return -EINVAL;
1882 }
1883 switch (enabler->event_param.u.syscall.abi) {
606828e4 1884 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1885 break;
606828e4 1886 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1887 if (compat)
1888 return 0;
1889 break;
606828e4 1890 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1891 if (!compat)
1892 return 0;
1893 break;
1894 default:
1895 return -EINVAL;
1896 }
1897 switch (enabler->event_param.u.syscall.match) {
606828e4 1898 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1899 switch (enabler->format_type) {
1900 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1901 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1902 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1903 return lttng_match_enabler_name(desc_name, enabler_name);
1904 default:
1905 return -EINVAL;
1906 }
1907 break;
606828e4 1908 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 1909 return -EINVAL; /* Not implemented. */
1910 default:
1911 return -EINVAL;
1912 }
4ecb5ad5 1913 break;
b4a75708 1914
4ecb5ad5
MD		 1915 default:
1916 WARN_ON_ONCE(1);
1917 return -EINVAL;
1918 }
3c997079
MD		 1919}
1920
8bff0fc3
MD		 1921bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
1922 struct lttng_event_enabler_common *enabler)
1923{
1924 int ret;
1925
1926 ret = lttng_desc_match_enabler_check(desc, enabler);
1927 if (ret < 0) {
1928 WARN_ON_ONCE(1);
1929 return false;
1930 }
1931 return ret;
1932}
1933
5c6ec66a
MD		 1934bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
1935 struct lttng_kernel_event_common *event)
3c997079 1936{
5c6ec66a
MD		 1937 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
1938 return false;
b2bc0bc8 1939
5c6ec66a
MD		 1940 switch (event_enabler->enabler_type) {
1941 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1942 {
1943 struct lttng_event_recorder_enabler *event_recorder_enabler =
1944 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1945 struct lttng_kernel_event_recorder *event_recorder =
1946 container_of(event, struct lttng_kernel_event_recorder, parent);
1947
1948 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
1949 && event_recorder->chan == event_recorder_enabler->chan)
1950 return true;
1951 else
1952 return false;
1953 }
1954 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1955 {
1956 struct lttng_event_notifier_enabler *event_notifier_enabler =
1957 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1958 struct lttng_kernel_event_notifier *event_notifier =
1959 container_of(event, struct lttng_kernel_event_notifier, parent);
1960
1961 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
1962 && event_notifier->priv->group == event_notifier_enabler->group
1963 && event->priv->user_token == event_enabler->user_token)
1964 return true;
1965 else
1966 return false;
1967 }
1968 default:
1969 WARN_ON_ONCE(1);
1970 return false;
1971 }
3c997079
MD		 1972}
1973
5c6ec66a
MD		 1974bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
1975 const struct lttng_kernel_event_desc *desc,
1976 struct lttng_kernel_event_common *event)
b01155ba 1977{
5c6ec66a
MD		 1978 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
1979 return false;
b01155ba 1980
5c6ec66a
MD		 1981 switch (event_enabler->enabler_type) {
1982 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1983 {
1984 struct lttng_event_recorder_enabler *event_recorder_enabler =
1985 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1986 struct lttng_kernel_event_recorder *event_recorder =
1987 container_of(event, struct lttng_kernel_event_recorder, parent);
1988
1989 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
1990 return true;
1991 else
1992 return false;
1993 }
1994 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1995 {
1996 struct lttng_event_notifier_enabler *event_notifier_enabler =
1997 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1998 struct lttng_kernel_event_notifier *event_notifier =
1999 container_of(event, struct lttng_kernel_event_notifier, parent);
2000
2001 if (event->priv->desc == desc
2002 && event_notifier->priv->group == event_notifier_enabler->group
2003 && event->priv->user_token == event_enabler->user_token)
2004 return true;
2005 else
2006 return false;
2007 }
2008 default:
2009 WARN_ON_ONCE(1);
2010 return false;
2011 }
b01155ba
FD		 2012}
2013
0d223dc6
MD		 2014bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler,
2015 const char *event_name,
2016 struct lttng_kernel_event_common *event)
2017{
2018 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2019 return false;
2020
2021 switch (event_enabler->enabler_type) {
2022 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2023 {
2024 struct lttng_event_recorder_enabler *event_recorder_enabler =
2025 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2026 struct lttng_kernel_event_recorder *event_recorder =
2027 container_of(event, struct lttng_kernel_event_recorder, parent);
2028
2029 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2030 && event_recorder->chan == event_recorder_enabler->chan)
2031 return true;
2032 else
2033 return false;
2034 }
2035 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2036 {
2037 struct lttng_event_notifier_enabler *event_notifier_enabler =
2038 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2039 struct lttng_kernel_event_notifier *event_notifier =
2040 container_of(event, struct lttng_kernel_event_notifier, parent);
2041
2042 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2043 && event_notifier->priv->group == event_notifier_enabler->group
2044 && event->priv->user_token == event_enabler->user_token)
2045 return true;
2046 else
2047 return false;
2048 }
2049 default:
2050 WARN_ON_ONCE(1);
2051 return false;
2052 }
2053}
2054
3c997079 2055static
b2bc0bc8
FD		 2056struct lttng_enabler_ref *lttng_enabler_ref(
2057 struct list_head *enablers_ref_list,
8d554755 2058 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2059{
2060 struct lttng_enabler_ref *enabler_ref;
2061
b2bc0bc8 2062 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2063 if (enabler_ref->ref == enabler)
2064 return enabler_ref;
2065 }
2066 return NULL;
2067}
2068
3c997079 2069static
b2f63bde 2070void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler)
3c997079 2071{
c8e14380 2072 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
437d5aa5
MD		 2073 struct lttng_kernel_probe_desc *probe_desc;
2074 const struct lttng_kernel_event_desc *desc;
3c997079 2075 struct list_head *probe_list;
c8e14380 2076 int i;
3c997079
MD		 2077
2078 probe_list = lttng_get_probe_list_head();
2079 /*
2080 * For each probe event, if we find that a probe event matches
2081 * our enabler, create an associated lttng_event if not
2082 * already present.
2083 */
2084 list_for_each_entry(probe_desc, probe_list, head) {
2085 for (i = 0; i < probe_desc->nr_events; i++) {
58969906 2086 bool found = false;
3c997079 2087 struct hlist_head *head;
83006ee0 2088 struct lttng_kernel_event_common *event;
19bef247 2089 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2090
2091 desc = probe_desc->event_desc[i];
c8e14380 2092 if (!lttng_desc_match_enabler(desc, event_enabler))
3c997079 2093 continue;
3c997079
MD		 2094
2095 /*
2096 * Check if already created.
2097 */
0def9170 2098 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2099 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
58969906
MD		 2100 if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) {
2101 found = true;
2102 break;
2103 }
3c997079
MD		 2104 }
2105 if (found)
2106 continue;
2107
2108 /*
83006ee0 2109 * We need to create an event for this event probe.
3c997079 2110 */
c8e14380 2111 event = _lttng_kernel_event_create(event_enabler, desc);
c3fb484e 2112 if (IS_ERR(event)) {
5a15f70c 2113 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2114 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2115 }
2116 }
2117 }
2118}
2119
33a39a3c 2120/*
8839618b 2121 * Create event if it is missing and present in the list of tracepoint probes.
33a39a3c
MD		 2122 * Should be called with sessions mutex held.
2123 */
2124static
b2f63bde 2125void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c 2126{
b2f63bde
MD		 2127 int ret;
2128
8839618b 2129 switch (event_enabler->event_param.instrumentation) {
606828e4 2130 case LTTNG_KERNEL_ABI_TRACEPOINT:
b2f63bde 2131 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler);
33a39a3c 2132 break;
b4a75708 2133
606828e4 2134 case LTTNG_KERNEL_ABI_SYSCALL:
b2f63bde
MD		 2135 ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler);
2136 WARN_ON_ONCE(ret);
33a39a3c 2137 break;
b4a75708 2138
33a39a3c
MD		 2139 default:
2140 WARN_ON_ONCE(1);
2141 break;
2142 }
2143}
2144
d619fae9
MD		 2145static
2146void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
2147 struct lttng_kernel_event_common *event)
2148{
2149 /* Link filter bytecodes if not linked yet. */
2150 lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx,
2151 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
2152}
2153
1e06b222
MD		 2154static
2155void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
2156 struct lttng_kernel_event_common *event)
2157{
2158 switch (event_enabler->enabler_type) {
2159 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2160 break;
2161 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2162 {
2163 struct lttng_event_notifier_enabler *event_notifier_enabler =
2164 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2165 struct lttng_kernel_event_notifier *event_notifier =
2166 container_of(event, struct lttng_kernel_event_notifier, parent);
2167
2168 /* Link capture bytecodes if not linked yet. */
2169 lttng_enabler_link_bytecode(event->priv->desc,
2170 lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head,
2171 &event_notifier_enabler->capture_bytecode_head);
2172 event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
2173 break;
2174 }
2175 default:
2176 WARN_ON_ONCE(1);
2177 }
2178}
2179
3c997079 2180/*
b2bc0bc8 2181 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2182 * and add backward reference from the event to the enabler.
2183 * Should be called with sessions mutex held.
2184 */
2185static
3622cd47 2186int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler)
3c997079 2187{
3622cd47
MD		 2188 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
2189 struct lttng_kernel_event_common_private *event_priv;
3c997079 2190
3622cd47 2191 lttng_syscall_table_set_wildcard_all(event_enabler);
badfe9f5 2192
3c997079 2193 /* First ensure that probe events are created for this enabler. */
b2f63bde 2194 lttng_event_enabler_create_events_if_missing(event_enabler);
3c997079 2195
3622cd47
MD		 2196 /* Link the created event with its associated enabler. */
2197 list_for_each_entry(event_priv, event_list_head, node) {
2198 struct lttng_kernel_event_common *event = event_priv->pub;
b01155ba
FD		 2199 struct lttng_enabler_ref *enabler_ref;
2200
3622cd47 2201 if (!lttng_event_enabler_match_event(event_enabler, event))
b01155ba
FD		 2202 continue;
2203
3622cd47 2204 enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler);
b01155ba
FD		 2205 if (!enabler_ref) {
2206 /*
2207 * If no backward ref, create it.
2208 * Add backward ref from event_notifier to enabler.
2209 */
2210 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2211 if (!enabler_ref)
2212 return -ENOMEM;
2213
3622cd47
MD		 2214 enabler_ref->ref = event_enabler;
2215 list_add(&enabler_ref->node, &event_priv->enablers_ref_head);
b01155ba
FD		 2216 }
2217
3622cd47
MD		 2218 lttng_event_enabler_init_event_filter(event_enabler, event);
2219 lttng_event_enabler_init_event_capture(event_enabler, event);
b01155ba
FD		 2220 }
2221 return 0;
2222}
2223
3c997079
MD		 2224/*
2225 * Called at module load: connect the probe on all enablers matching
2226 * this event.
2227 * Called with sessions lock held.
2228 */
2229int lttng_fix_pending_events(void)
2230{
8cdc1a81 2231 struct lttng_kernel_session_private *session_priv;
3c997079 2232
8cdc1a81
MD		 2233 list_for_each_entry(session_priv, &sessions, list)
2234 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2235 return 0;
2236}
2237
b01155ba
FD		 2238static bool lttng_event_notifier_group_has_active_event_notifiers(
2239 struct lttng_event_notifier_group *event_notifier_group)
2240{
09710b83 2241 struct lttng_event_enabler_common *event_enabler;
b01155ba 2242
09710b83
MD		 2243 list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) {
2244 if (event_enabler->enabled)
b01155ba
FD		 2245 return true;
2246 }
2247 return false;
2248}
2249
2250bool lttng_event_notifier_active(void)
2251{
2252 struct lttng_event_notifier_group *event_notifier_group;
2253
2254 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2255 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2256 return true;
2257 }
2258 return false;
2259}
2260
2261int lttng_fix_pending_event_notifiers(void)
2262{
2263 struct lttng_event_notifier_group *event_notifier_group;
2264
2265 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2266 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2267 return 0;
2268}
2269
1ae083ba 2270struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2271 enum lttng_enabler_format_type format_type,
606828e4 2272 struct lttng_kernel_abi_event *event_param,
f7d06400 2273 struct lttng_kernel_channel_buffer *chan)
3c997079 2274{
1ae083ba 2275 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2276
b2bc0bc8
FD		 2277 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2278 if (!event_enabler)
3c997079 2279 return NULL;
0bb716a8 2280 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2281 event_enabler->parent.format_type = format_type;
2282 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2283 memcpy(&event_enabler->parent.event_param, event_param,
2284 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2285 event_enabler->chan = chan;
3c997079 2286 /* ctx left NULL */
5b9817ae 2287 event_enabler->parent.enabled = 0;
def1e304
MD		 2288 return event_enabler;
2289}
2290
2291void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2292 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2293{
3c997079 2294 mutex_lock(&sessions_mutex);
09710b83
MD		 2295 list_add(&event_enabler->parent.node, &session->priv->enablers_head);
2296 event_enabler->parent.published = true;
def1e304 2297 lttng_session_lazy_sync_event_enablers(session);
3c997079 2298 mutex_unlock(&sessions_mutex);
3c997079
MD		 2299}
2300
7b25ab0e 2301int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2302{
2303 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2304 event_enabler->enabled = 1;
2305 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2306 mutex_unlock(&sessions_mutex);
2307 return 0;
2308}
2309
7b25ab0e 2310int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2311{
2312 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2313 event_enabler->enabled = 0;
2314 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2315 mutex_unlock(&sessions_mutex);
2316 return 0;
2317}
2318
b2bc0bc8 2319static
8d554755 2320int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2321 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2322{
d64ca521 2323 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2324 uint32_t bytecode_len;
2325 int ret;
2326
2327 ret = get_user(bytecode_len, &bytecode->len);
2328 if (ret)
2329 return ret;
52cfcdf3 2330 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2331 GFP_KERNEL);
2332 if (!bytecode_node)
2333 return -ENOMEM;
2334 ret = copy_from_user(&bytecode_node->bc, bytecode,
2335 sizeof(*bytecode) + bytecode_len);
2336 if (ret)
2337 goto error_free;
b2bc0bc8 2338
8a445457 2339 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2340 bytecode_node->enabler = enabler;
2341 /* Enforce length based on allocated size */
2342 bytecode_node->bc.len = bytecode_len;
2343 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2344
07dfc1d0
MD		 2345 return 0;
2346
2347error_free:
52cfcdf3 2348 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2349 return ret;
2350}
2351
6048044f 2352int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2353 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2354{
2355 int ret;
6048044f 2356 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2357 if (ret)
2358 goto error;
7b25ab0e 2359 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2360 return 0;
2361
2362error:
2363 return ret;
2364}
2365
e2d5dbc7 2366int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2367 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2368{
2369
e2d5dbc7 2370 switch (event->priv->instrumentation) {
606828e4 2371 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2372 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2373 default:
2374 return -EINVAL;
2375 }
2376}
2377
3c997079 2378static
8d554755 2379void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2380{
d64ca521 2381 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2382
2383 /* Destroy filter bytecode */
2384 list_for_each_entry_safe(filter_node, tmp_filter_node,
2385 &enabler->filter_bytecode_head, node) {
52cfcdf3 2386 lttng_kvfree(filter_node);
07dfc1d0 2387 }
b2bc0bc8
FD		 2388}
2389
44b1abdc 2390void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2391{
09710b83
MD		 2392 lttng_enabler_destroy(event_enabler);
2393 if (event_enabler->published)
2394 list_del(&event_enabler->node);
2395
44b1abdc
MD		 2396 switch (event_enabler->enabler_type) {
2397 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2398 {
2399 struct lttng_event_recorder_enabler *event_recorder_enabler =
2400 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2401
44b1abdc
MD		 2402 kfree(event_recorder_enabler);
2403 break;
2404 }
2405 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2406 {
2407 struct lttng_event_notifier_enabler *event_notifier_enabler =
2408 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2409
44b1abdc
MD		 2410 kfree(event_notifier_enabler);
2411 break;
2412 }
2413 default:
2414 WARN_ON_ONCE(1);
2415 }
3c997079
MD		 2416}
2417
dffef45d 2418struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2419 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2420 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2421 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2422{
2423 struct lttng_event_notifier_enabler *event_notifier_enabler;
2424
2425 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2426 if (!event_notifier_enabler)
2427 return NULL;
2428
0bb716a8 2429 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2430 event_notifier_enabler->parent.format_type = format_type;
2431 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2432 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2433
99f52fcc 2434 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2435 event_notifier_enabler->num_captures = 0;
dffef45d 2436
5b9817ae
MD		 2437 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2438 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2439
5b9817ae
MD		 2440 event_notifier_enabler->parent.enabled = 0;
2441 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2442 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2443 return event_notifier_enabler;
2444}
dffef45d 2445
1bbb5b2d
MD		 2446void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2447 struct lttng_event_notifier_enabler *event_notifier_enabler)
2448{
dffef45d 2449 mutex_lock(&sessions_mutex);
09710b83
MD		 2450 list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head);
2451 event_notifier_enabler->parent.published = true;
b01155ba 2452 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2453 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2454}
2455
2456int lttng_event_notifier_enabler_enable(
2457 struct lttng_event_notifier_enabler *event_notifier_enabler)
2458{
2459 mutex_lock(&sessions_mutex);
2460 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2461 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2462 mutex_unlock(&sessions_mutex);
2463 return 0;
2464}
2465
2466int lttng_event_notifier_enabler_disable(
2467 struct lttng_event_notifier_enabler *event_notifier_enabler)
2468{
2469 mutex_lock(&sessions_mutex);
2470 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2471 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2472 mutex_unlock(&sessions_mutex);
2473 return 0;
2474}
2475
99d223ad
FD		 2476int lttng_event_notifier_enabler_attach_capture_bytecode(
2477 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2478 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2479{
d64ca521 2480 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2481 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2482 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2483 uint32_t bytecode_len;
2484 int ret;
2485
2486 ret = get_user(bytecode_len, &bytecode->len);
2487 if (ret)
2488 return ret;
2489
2490 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2491 GFP_KERNEL);
2492 if (!bytecode_node)
2493 return -ENOMEM;
2494
2495 ret = copy_from_user(&bytecode_node->bc, bytecode,
2496 sizeof(*bytecode) + bytecode_len);
2497 if (ret)
2498 goto error_free;
2499
8a445457 2500 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2501 bytecode_node->enabler = enabler;
2502
2503 /* Enforce length based on allocated size */
2504 bytecode_node->bc.len = bytecode_len;
2505 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2506
2507 event_notifier_enabler->num_captures++;
2508
2509 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2510 goto end;
2511
2512error_free:
2513 lttng_kvfree(bytecode_node);
2514end:
2515 return ret;
2516}
2517
cc5719b1
MD		 2518static
2519void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event)
2520{
2521 int has_enablers_without_filter_bytecode = 0, nr_filters = 0;
2522 struct lttng_kernel_bytecode_runtime *runtime;
2523 struct lttng_enabler_ref *enabler_ref;
2524
2525 /* Check if has enablers without bytecode enabled */
2526 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2527 if (enabler_ref->ref->enabled
2528 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2529 has_enablers_without_filter_bytecode = 1;
2530 break;
2531 }
2532 }
2533 event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode;
2534
2535 /* Enable filters */
2536 list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) {
2537 lttng_bytecode_sync_state(runtime);
2538 nr_filters++;
2539 }
2540 WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters));
2541}
2542
2543static
2544void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event)
2545{
2546 switch (event->type) {
2547 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2548 break;
2549 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2550 {
2551 struct lttng_kernel_event_notifier *event_notifier =
2552 container_of(event, struct lttng_kernel_event_notifier, parent);
2553 struct lttng_kernel_bytecode_runtime *runtime;
2554 int nr_captures = 0;
2555
2556 /* Enable captures */
2557 list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) {
2558 lttng_bytecode_sync_state(runtime);
2559 nr_captures++;
2560 }
2561 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2562 break;
2563 }
2564 default:
2565 WARN_ON_ONCE(1);
2566 }
2567}
2568
a0c6ad2e
MD		 2569static
2570bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event)
2571{
2572 struct lttng_enabler_ref *enabler_ref;
2573 bool enabled = false;
2574
2575 switch (event->priv->instrumentation) {
2576 case LTTNG_KERNEL_ABI_TRACEPOINT:
2577 lttng_fallthrough;
2578 case LTTNG_KERNEL_ABI_SYSCALL:
2579 /* Enable events */
2580 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2581 if (enabler_ref->ref->enabled) {
2582 enabled = true;
2583 break;
2584 }
2585 }
2586 break;
2587 default:
2588 WARN_ON_ONCE(1);
2589 return false;
2590 }
2591
2592 switch (event->type) {
2593 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2594 {
2595 struct lttng_kernel_event_recorder *event_recorder =
2596 container_of(event, struct lttng_kernel_event_recorder, parent);
2597
2598 /*
2599 * Enabled state is based on union of enablers, with
2600 * intersection of session and channel transient enable
2601 * states.
2602 */
2603 return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2604 }
2605 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2606 return enabled;
2607 default:
2608 WARN_ON_ONCE(1);
2609 return false;
2610 }
2611}
2612
2613static
2614bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event)
2615{
2616 switch (event->priv->instrumentation) {
2617 case LTTNG_KERNEL_ABI_TRACEPOINT:
2618 lttng_fallthrough;
2619 case LTTNG_KERNEL_ABI_SYSCALL:
2620 return true;
2621
2622 default:
2623 /* Not handled with lazy sync. */
2624 return false;
2625 }
2626}
2627
3c997079 2628/*
3c997079
MD		 2629 * Should be called with sessions mutex held.
2630 */
2631static
a0c6ad2e
MD		 2632void lttng_sync_event_list(struct list_head *event_enabler_list,
2633 struct list_head *event_list)
3c997079 2634{
a0c6ad2e 2635 struct lttng_kernel_event_common_private *event_priv;
09710b83 2636 struct lttng_event_enabler_common *event_enabler;
3c997079 2637
a0c6ad2e 2638 list_for_each_entry(event_enabler, event_enabler_list, node)
09710b83 2639 lttng_event_enabler_ref_events(event_enabler);
a0c6ad2e 2640
3c997079
MD		 2641 /*
2642 * For each event, if at least one of its enablers is enabled,
2643 * and its channel and session transient states are enabled, we
2644 * enable the event, else we disable it.
2645 */
a0c6ad2e
MD		 2646 list_for_each_entry(event_priv, event_list, node) {
2647 struct lttng_kernel_event_common *event = event_priv->pub;
2648 bool enabled;
b4a75708 2649
a0c6ad2e 2650 if (!lttng_event_is_lazy_sync(event))
3c997079 2651 continue;
3c997079 2652
a0c6ad2e
MD		 2653 enabled = lttng_get_event_enabled_state(event);
2654 WRITE_ONCE(event->enabled, enabled);
3c997079 2655 /*
a0c6ad2e 2656 * Sync tracepoint registration with event enabled state.
3c997079
MD		 2657 */
2658 if (enabled) {
6a338ba4
MD		 2659 if (!event_priv->registered)
2660 register_event(event);
3c997079 2661 } else {
6a338ba4
MD		 2662 if (event_priv->registered)
2663 unregister_event(event);
3c997079 2664 }
07dfc1d0 2665
a0c6ad2e
MD		 2666 lttng_event_sync_filter_state(event);
2667 lttng_event_sync_capture_state(event);
3c997079
MD		 2668 }
2669}
2670
a0c6ad2e
MD		 2671/*
2672 * lttng_session_sync_event_enablers should be called just before starting a
2673 * session.
2674 */
2675static
2676void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2677{
2678 lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events);
2679}
2680
3c997079
MD		 2681/*
2682 * Apply enablers to session events, adding events to session if need
2683 * be. It is required after each modification applied to an active
2684 * session, and right before session "start".
2685 * "lazy" sync means we only sync if required.
2686 * Should be called with sessions mutex held.
2687 */
2688static
8cdc1a81 2689void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2690{
2691 /* We can skip if session is not active */
2692 if (!session->active)
2693 return;
b2bc0bc8 2694 lttng_session_sync_event_enablers(session);
3c997079
MD		 2695}
2696
b01155ba
FD		 2697static
2698void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2699{
a0c6ad2e 2700 lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head);
b01155ba
FD		 2701}
2702
7b25ab0e
MD		 2703static
2704void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2705{
2706 switch (event_enabler->enabler_type) {
2707 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2708 {
2709 struct lttng_event_recorder_enabler *event_recorder_enabler =
2710 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2711 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2712 break;
2713 }
2714 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2715 {
2716 struct lttng_event_notifier_enabler *event_notifier_enabler =
2717 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2718 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2719 break;
2720 }
2721 default:
2722 WARN_ON_ONCE(1);
2723 }
2724}
2725
1ec3f75a 2726/*
d83004aa
JD		 2727 * Serialize at most one packet worth of metadata into a metadata
2728 * channel.
92d9f5e6
MD		 2729 * We grab the metadata cache mutex to get exclusive access to our metadata
2730 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2731 * allows us to do racy operations such as looking for remaining space left in
2732 * packet and write, since mutual exclusion protects us from concurrent writes.
2733 * Mutual exclusion on the metadata cache allow us to read the cache content
2734 * without racing against reallocation of the cache by updates.
35097f36
JD		 2735 * Returns the number of bytes written in the channel, 0 if no data
2736 * was written and a negative value on error.
1ec3f75a 2737 */
b3b8072b 2738int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2739 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2740{
8a57ec02 2741 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2742 int ret = 0;
2743 size_t len, reserve_len;
2744
f613e3e6 2745 /*
92d9f5e6
MD		 2746 * Ensure we support mutiple get_next / put sequences followed by
2747 * put_next. The metadata cache lock protects reading the metadata
2748 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2749 * "flush" operations on the buffer invoked by different processes.
2750 * Moreover, since the metadata cache memory can be reallocated, we
2751 * need to have exclusive access against updates even though we only
2752 * read it.
f613e3e6 2753 */
92d9f5e6 2754 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2755 WARN_ON(stream->metadata_in < stream->metadata_out);
2756 if (stream->metadata_in != stream->metadata_out)
de23d59d 2757 goto end;
f613e3e6 2758
9616f0bf
JD		 2759 /* Metadata regenerated, change the version. */
2760 if (stream->metadata_cache->version != stream->version)
2761 stream->version = stream->metadata_cache->version;
2762
d83004aa 2763 len = stream->metadata_cache->metadata_written -
f613e3e6 2764 stream->metadata_in;
9de2c215 2765 if (!len)
de23d59d 2766 goto end;
d83004aa 2767 reserve_len = min_t(size_t,
4a399b76 2768 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2769 len);
a775608d 2770 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2771 sizeof(char), NULL);
d83004aa
JD		 2772 /*
2773 * If reservation failed, return an error to the caller.
2774 */
c2fb9c1c 2775 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2776 if (ret != 0) {
2777 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2778 stream->coherent = false;
d83004aa
JD		 2779 goto end;
2780 }
b3b8072b 2781 stream->transport->ops.event_write(&ctx,
f613e3e6 2782 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2783 reserve_len, 1);
b3b8072b 2784 stream->transport->ops.event_commit(&ctx);
f613e3e6 2785 stream->metadata_in += reserve_len;
3e75e2a7 2786 if (reserve_len < len)
8b97fd42
MD		 2787 stream->coherent = false;
2788 else
2789 stream->coherent = true;
d83004aa
JD		 2790 ret = reserve_len;
2791
2792end:
8b97fd42
MD		 2793 if (coherent)
2794 *coherent = stream->coherent;
92d9f5e6 2795 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2796 return ret;
2797}
2798
8b97fd42 2799static
8cdc1a81 2800void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2801{
8cdc1a81
MD		 2802 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2803 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2804}
2805
2806static
8cdc1a81 2807void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2808{
8cdc1a81
MD		 2809 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2810 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2811 struct lttng_metadata_stream *stream;
2812
8cdc1a81 2813 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2814 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2815 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2816 }
8b97fd42
MD		 2817}
2818
d83004aa
JD		 2819/*
2820 * Write the metadata to the metadata cache.
2821 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2822 * The metadata cache lock protects us from concurrent read access from
2823 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2824 * The content of the printf is printed as a single atomic metadata
2825 * transaction.
d83004aa 2826 */
8cdc1a81 2827int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2828 const char *fmt, ...)
2829{
c099397a 2830 char *str;
d83004aa 2831 size_t len;
c099397a
MD		 2832 va_list ap;
2833
585e5dcc 2834 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2835
2836 va_start(ap, fmt);
2837 str = kvasprintf(GFP_KERNEL, fmt, ap);
2838 va_end(ap);
2839 if (!str)
2840 return -ENOMEM;
2841
1ec3f75a 2842 len = strlen(str);
8cdc1a81
MD		 2843 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2844 if (session->priv->metadata_cache->metadata_written + len >
2845 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2846 char *tmp_cache_realloc;
2847 unsigned int tmp_cache_alloc_size;
2848
2849 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2850 session->priv->metadata_cache->cache_alloc + len,
2851 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2852 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2853 if (!tmp_cache_realloc)
2854 goto err;
8cdc1a81 2855 if (session->priv->metadata_cache->data) {
a606b6e8 2856 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 2857 session->priv->metadata_cache->data,
2858 session->priv->metadata_cache->cache_alloc);
2859 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 2860 }
2861
8cdc1a81
MD		 2862 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2863 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 2864 }
8cdc1a81
MD		 2865 memcpy(session->priv->metadata_cache->data +
2866 session->priv->metadata_cache->metadata_written,
d83004aa 2867 str, len);
8cdc1a81 2868 session->priv->metadata_cache->metadata_written += len;
c099397a 2869 kfree(str);
d83004aa 2870
d83004aa
JD		 2871 return 0;
2872
2873err:
2874 kfree(str);
2875 return -ENOMEM;
c099397a
MD		 2876}
2877
f513b2bf 2878static
8cdc1a81 2879int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 2880{
2881 size_t i;
2882
2883 for (i = 0; i < nesting; i++) {
2884 int ret;
2885
2886 ret = lttng_metadata_printf(session, " ");
2887 if (ret) {
2888 return ret;
2889 }
2890 }
2891 return 0;
2892}
2893
ceabb767 2894static
8cdc1a81 2895int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 2896 const struct lttng_kernel_event_field *field,
ceabb767
MD		 2897 size_t nesting)
2898{
2899 return lttng_metadata_printf(session, " _%s;\n", field->name);
2900}
2901
2902static
8cdc1a81 2903int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 2904 const struct lttng_kernel_type_integer *type,
2905 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 2906 size_t nesting)
2907{
2908 int ret;
2909
ceabb767
MD		 2910 ret = print_tabs(session, nesting);
2911 if (ret)
2912 return ret;
2913 ret = lttng_metadata_printf(session,
2914 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 2915 type->size,
2916 type->alignment,
2917 type->signedness,
2918 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 2919 ? "none"
437d5aa5 2920 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 2921 ? "UTF8"
2922 : "ASCII",
437d5aa5 2923 type->base,
ceabb767 2924#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 2925 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 2926#else
437d5aa5 2927 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 2928#endif
2929 );
2930 return ret;
2931}
2932
f513b2bf
MD		 2933/*
2934 * Must be called with sessions_mutex held.
2935 */
2936static
8cdc1a81 2937int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 2938 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 2939 size_t nesting)
2940{
51ef4536 2941 const char *prev_field_name = NULL;
f513b2bf
MD		 2942 int ret;
2943 uint32_t i, nr_fields;
ceabb767
MD		 2944 unsigned int alignment;
2945
f513b2bf
MD		 2946 ret = print_tabs(session, nesting);
2947 if (ret)
2948 return ret;
2949 ret = lttng_metadata_printf(session,
2950 "struct {\n");
2951 if (ret)
2952 return ret;
437d5aa5 2953 nr_fields = type->nr_fields;
f513b2bf 2954 for (i = 0; i < nr_fields; i++) {
437d5aa5 2955 const struct lttng_kernel_event_field *iter_field;
f513b2bf 2956
437d5aa5 2957 iter_field = type->fields[i];
51ef4536 2958 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 2959 if (ret)
2960 return ret;
2961 }
2962 ret = print_tabs(session, nesting);
2963 if (ret)
2964 return ret;
437d5aa5 2965 alignment = type->alignment;
ceabb767
MD		 2966 if (alignment) {
2967 ret = lttng_metadata_printf(session,
2968 "} align(%u)",
2969 alignment);
2970 } else {
2971 ret = lttng_metadata_printf(session,
2972 "}");
2973 }
f513b2bf
MD		 2974 return ret;
2975}
2976
2977/*
2978 * Must be called with sessions_mutex held.
2979 */
2980static
8cdc1a81 2981int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 2982 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 2983 size_t nesting)
2984{
2985 int ret;
2986
2987 ret = _lttng_struct_type_statedump(session,
437d5aa5 2988 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 2989 if (ret)
2990 return ret;
ceabb767 2991 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 2992}
2993
65c85aa6
MD		 2994/*
2995 * Must be called with sessions_mutex held.
2996 */
2997static
8cdc1a81 2998int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 2999 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3000 size_t nesting,
3001 const char *prev_field_name)
65c85aa6 3002{
51ef4536 3003 const char *tag_name;
65c85aa6
MD		 3004 int ret;
3005 uint32_t i, nr_choices;
3006
51ef4536
MD		 3007 tag_name = type->tag_name;
3008 if (!tag_name)
3009 tag_name = prev_field_name;
3010 if (!tag_name)
3011 return -EINVAL;
ceabb767
MD		 3012 /*
3013 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3014 */
437d5aa5 3015 if (type->alignment != 0)
ceabb767 3016 return -EINVAL;
65c85aa6
MD		 3017 ret = print_tabs(session, nesting);
3018 if (ret)
3019 return ret;
3020 ret = lttng_metadata_printf(session,
3021 "variant <_%s> {\n",
51ef4536 3022 tag_name);
65c85aa6
MD		 3023 if (ret)
3024 return ret;
437d5aa5 3025 nr_choices = type->nr_choices;
65c85aa6 3026 for (i = 0; i < nr_choices; i++) {
437d5aa5 3027 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3028
437d5aa5 3029 iter_field = type->choices[i];
51ef4536 3030 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3031 if (ret)
3032 return ret;
3033 }
3034 ret = print_tabs(session, nesting);
3035 if (ret)
3036 return ret;
3037 ret = lttng_metadata_printf(session,
3038 "}");
3039 return ret;
3040}
3041
3042/*
3043 * Must be called with sessions_mutex held.
3044 */
3045static
8cdc1a81 3046int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3047 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3048 size_t nesting,
3049 const char *prev_field_name)
65c85aa6
MD		 3050{
3051 int ret;
3052
3053 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3054 lttng_kernel_get_type_variant(field->type), nesting,
3055 prev_field_name);
65c85aa6
MD		 3056 if (ret)
3057 return ret;
ceabb767 3058 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3059}
3060
f513b2bf
MD		 3061/*
3062 * Must be called with sessions_mutex held.
3063 */
3064static
8cdc1a81 3065int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3066 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3067 size_t nesting)
3068{
3069 int ret;
437d5aa5
MD		 3070 const struct lttng_kernel_type_array *array_type;
3071 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3072
437d5aa5
MD		 3073 array_type = lttng_kernel_get_type_array(field->type);
3074 WARN_ON_ONCE(!array_type);
ceabb767 3075
437d5aa5 3076 if (array_type->alignment) {
ceabb767 3077 ret = print_tabs(session, nesting);
f513b2bf
MD		 3078 if (ret)
3079 return ret;
ceabb767
MD		 3080 ret = lttng_metadata_printf(session,
3081 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3082 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3083 field->name);
3084 if (ret)
3085 return ret;
3086 }
3087 /*
3088 * Nested compound types: Only array of structures and variants are
3089 * currently supported.
3090 */
437d5aa5 3091 elem_type = array_type->elem_type;
12bb2edb
MD		 3092 switch (elem_type->type) {
3093 case lttng_kernel_type_integer:
437d5aa5
MD		 3094 case lttng_kernel_type_struct:
3095 case lttng_kernel_type_variant:
3096 ret = _lttng_type_statedump(session, elem_type,
3097 array_type->encoding, nesting);
65c85aa6
MD		 3098 if (ret)
3099 return ret;
3100 break;
ceabb767 3101
f513b2bf
MD		 3102 default:
3103 return -EINVAL;
3104 }
3105 ret = lttng_metadata_printf(session,
3106 " _%s[%u];\n",
3107 field->name,
437d5aa5 3108 array_type->length);
f513b2bf
MD		 3109 return ret;
3110}
3111
3112/*
3113 * Must be called with sessions_mutex held.
3114 */
3115static
8cdc1a81 3116int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3117 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3118 size_t nesting,
3119 const char *prev_field_name)
f513b2bf
MD		 3120{
3121 int ret;
3122 const char *length_name;
437d5aa5
MD		 3123 const struct lttng_kernel_type_sequence *sequence_type;
3124 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3125
437d5aa5
MD		 3126 sequence_type = lttng_kernel_get_type_sequence(field->type);
3127 WARN_ON_ONCE(!sequence_type);
f513b2bf 3128
437d5aa5 3129 length_name = sequence_type->length_name;
51ef4536
MD		 3130 if (!length_name)
3131 length_name = prev_field_name;
3132 if (!length_name)
3133 return -EINVAL;
ceabb767 3134
437d5aa5 3135 if (sequence_type->alignment) {
ceabb767 3136 ret = print_tabs(session, nesting);
f513b2bf
MD		 3137 if (ret)
3138 return ret;
ceabb767
MD		 3139 ret = lttng_metadata_printf(session,
3140 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3141 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3142 field->name);
3143 if (ret)
3144 return ret;
3145 }
3146
3147 /*
3148 * Nested compound types: Only array of structures and variants are
3149 * currently supported.
3150 */
437d5aa5 3151 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3152 switch (elem_type->type) {
3153 case lttng_kernel_type_integer:
437d5aa5
MD		 3154 case lttng_kernel_type_struct:
3155 case lttng_kernel_type_variant:
3156 ret = _lttng_type_statedump(session, elem_type,
3157 sequence_type->encoding, nesting);
65c85aa6
MD		 3158 if (ret)
3159 return ret;
3160 break;
ceabb767 3161
f513b2bf
MD		 3162 default:
3163 return -EINVAL;
3164 }
3165 ret = lttng_metadata_printf(session,
3166 " _%s[ _%s ];\n",
3167 field->name,
51ef4536 3168 length_name);
f513b2bf
MD		 3169 return ret;
3170}
3171
141ddf28
MD		 3172/*
3173 * Must be called with sessions_mutex held.
3174 */
3175static
8cdc1a81 3176int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3177 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3178 size_t nesting)
3179{
d96a4a7a 3180 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3181 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3182 int ret;
3183 unsigned int i, nr_entries;
3184
437d5aa5 3185 container_type = type->container_type;
12bb2edb 3186 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3187 ret = -EINVAL;
3188 goto end;
3189 }
437d5aa5 3190 enum_desc = type->desc;
141ddf28
MD		 3191 nr_entries = enum_desc->nr_entries;
3192
3193 ret = print_tabs(session, nesting);
3194 if (ret)
3195 goto end;
ceabb767
MD		 3196 ret = lttng_metadata_printf(session, "enum : ");
3197 if (ret)
3198 goto end;
437d5aa5
MD		 3199 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3200 lttng_kernel_string_encoding_none, 0);
141ddf28 3201 if (ret)
ceabb767
MD		 3202 goto end;
3203 ret = lttng_metadata_printf(session, " {\n");
3204 if (ret)
3205 goto end;
141ddf28
MD		 3206 /* Dump all entries */
3207 for (i = 0; i < nr_entries; i++) {
437d5aa5 3208 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3209 int j, len;
3210
3211 ret = print_tabs(session, nesting + 1);
3212 if (ret)
3213 goto end;
3214 ret = lttng_metadata_printf(session,
3215 "\"");
3216 if (ret)
3217 goto end;
3218 len = strlen(entry->string);
3219 /* Escape the character '"' */
3220 for (j = 0; j < len; j++) {
3221 char c = entry->string[j];
3222
3223 switch (c) {
3224 case '"':
3225 ret = lttng_metadata_printf(session,
3226 "\\\"");
3227 break;
3228 case '\\':
3229 ret = lttng_metadata_printf(session,
3230 "\\\\");
3231 break;
3232 default:
3233 ret = lttng_metadata_printf(session,
3234 "%c", c);
3235 break;
3236 }
3237 if (ret)
3238 goto end;
3239 }
08ad1061
PP		 3240 ret = lttng_metadata_printf(session, "\"");
3241 if (ret)
3242 goto end;
3243
3244 if (entry->options.is_auto) {
3245 ret = lttng_metadata_printf(session, ",\n");
3246 if (ret)
3247 goto end;
141ddf28 3248 } else {
7c559490
MD		 3249 ret = lttng_metadata_printf(session,
3250 " = ");
3251 if (ret)
3252 goto end;
3253 if (entry->start.signedness)
141ddf28 3254 ret = lttng_metadata_printf(session,
7c559490
MD		 3255 "%lld", (long long) entry->start.value);
3256 else
3257 ret = lttng_metadata_printf(session,
3258 "%llu", entry->start.value);
3259 if (ret)
3260 goto end;
3261 if (entry->start.signedness == entry->end.signedness &&
3262 entry->start.value
3263 == entry->end.value) {
141ddf28 3264 ret = lttng_metadata_printf(session,
7c559490
MD		 3265 ",\n");
3266 } else {
3267 if (entry->end.signedness) {
3268 ret = lttng_metadata_printf(session,
3269 " ... %lld,\n",
3270 (long long) entry->end.value);
3271 } else {
3272 ret = lttng_metadata_printf(session,
3273 " ... %llu,\n",
3274 entry->end.value);
3275 }
141ddf28 3276 }
7c559490
MD		 3277 if (ret)
3278 goto end;
141ddf28 3279 }
141ddf28
MD		 3280 }
3281 ret = print_tabs(session, nesting);
3282 if (ret)
3283 goto end;
ceabb767 3284 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3285end:
3286 return ret;
3287}
3288
d83004aa
JD		 3289/*
3290 * Must be called with sessions_mutex held.
3291 */
c099397a 3292static
8cdc1a81 3293int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3294 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3295 size_t nesting)
3296{
3297 int ret;
437d5aa5 3298 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3299
437d5aa5
MD		 3300 enum_type = lttng_kernel_get_type_enum(field->type);
3301 WARN_ON_ONCE(!enum_type);
3302 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3303 if (ret)
3304 return ret;
3305 return lttng_field_name_statedump(session, field, nesting);
3306}
3307
3308static
8cdc1a81 3309int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3310 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3311 size_t nesting)
3312{
3313 int ret;
3314
437d5aa5
MD		 3315 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3316 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3317 if (ret)
3318 return ret;
3319 return lttng_field_name_statedump(session, field, nesting);
3320}
3321
3322static
8cdc1a81 3323int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3324 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3325 size_t nesting)
3326{
3327 int ret;
3328
ceabb767
MD		 3329 /* Default encoding is UTF8 */
3330 ret = print_tabs(session, nesting);
3331 if (ret)
3332 return ret;
3333 ret = lttng_metadata_printf(session,
3334 "string%s",
437d5aa5 3335 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3336 " { encoding = ASCII; }" : "");
3337 return ret;
3338}
3339
3340static
8cdc1a81 3341int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3342 const struct lttng_kernel_event_field *field,
f513b2bf 3343 size_t nesting)
ceabb767 3344{
437d5aa5 3345 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3346 int ret;
3347
437d5aa5
MD		 3348 string_type = lttng_kernel_get_type_string(field->type);
3349 WARN_ON_ONCE(!string_type);
3350 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3351 if (ret)
3352 return ret;
3353 return lttng_field_name_statedump(session, field, nesting);
3354}
3355
3356/*
3357 * Must be called with sessions_mutex held.
3358 */
3359static
8cdc1a81 3360int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3361 const struct lttng_kernel_type_common *type,
3362 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3363 size_t nesting)
c099397a 3364{
c099397a 3365 int ret = 0;
c099397a 3366
12bb2edb
MD		 3367 switch (type->type) {
3368 case lttng_kernel_type_integer:
437d5aa5
MD		 3369 ret = _lttng_integer_type_statedump(session,
3370 lttng_kernel_get_type_integer(type),
3371 parent_encoding, nesting);
8070f5c0 3372 break;
437d5aa5
MD		 3373 case lttng_kernel_type_enum:
3374 ret = _lttng_enum_type_statedump(session,
3375 lttng_kernel_get_type_enum(type),
3376 nesting);
8070f5c0 3377 break;
12bb2edb 3378 case lttng_kernel_type_string:
437d5aa5
MD		 3379 ret = _lttng_string_type_statedump(session,
3380 lttng_kernel_get_type_string(type),
3381 nesting);
ceabb767 3382 break;
437d5aa5
MD		 3383 case lttng_kernel_type_struct:
3384 ret = _lttng_struct_type_statedump(session,
3385 lttng_kernel_get_type_struct(type),
3386 nesting);
8070f5c0 3387 break;
437d5aa5
MD		 3388 case lttng_kernel_type_variant:
3389 ret = _lttng_variant_type_statedump(session,
3390 lttng_kernel_get_type_variant(type),
51ef4536 3391 nesting, NULL);
ceabb767
MD		 3392 break;
3393
3394 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3395 case lttng_kernel_type_array:
3396 case lttng_kernel_type_sequence:
ceabb767
MD		 3397 default:
3398 WARN_ON_ONCE(1);
3399 return -EINVAL;
8070f5c0 3400 }
ceabb767
MD		 3401 return ret;
3402}
8070f5c0 3403
ceabb767
MD		 3404/*
3405 * Must be called with sessions_mutex held.
3406 */
3407static
8cdc1a81 3408int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3409 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3410 size_t nesting,
3411 const char **prev_field_name_p)
ceabb767 3412{
51ef4536 3413 const char *prev_field_name = NULL;
ceabb767 3414 int ret = 0;
27d2368e 3415
51ef4536
MD		 3416 if (prev_field_name_p)
3417 prev_field_name = *prev_field_name_p;
437d5aa5 3418 switch (field->type->type) {
12bb2edb 3419 case lttng_kernel_type_integer:
ceabb767
MD		 3420 ret = _lttng_integer_field_statedump(session, field, nesting);
3421 break;
437d5aa5 3422 case lttng_kernel_type_enum:
ceabb767 3423 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3424 break;
12bb2edb 3425 case lttng_kernel_type_string:
ceabb767 3426 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3427 break;
437d5aa5 3428 case lttng_kernel_type_struct:
ceabb767 3429 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3430 break;
437d5aa5 3431 case lttng_kernel_type_array:
ceabb767 3432 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3433 break;
437d5aa5 3434 case lttng_kernel_type_sequence:
51ef4536 3435 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3436 break;
437d5aa5 3437 case lttng_kernel_type_variant:
51ef4536 3438 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3439 break;
f513b2bf 3440
8070f5c0
MD		 3441 default:
3442 WARN_ON_ONCE(1);
3443 return -EINVAL;
3444 }
51ef4536
MD		 3445 if (prev_field_name_p)
3446 *prev_field_name_p = field->name;
8070f5c0
MD		 3447 return ret;
3448}
3449
3450static
8cdc1a81 3451int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3452 struct lttng_kernel_ctx *ctx)
8070f5c0 3453{
51ef4536 3454 const char *prev_field_name = NULL;
8070f5c0
MD		 3455 int ret = 0;
3456 int i;
3457
3458 if (!ctx)
3459 return 0;
3460 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3461 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3462
51ef4536 3463 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3464 if (ret)
3465 return ret;
3466 }
3467 return ret;
3468}
3469
3470static
8cdc1a81 3471int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3472 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3473{
51ef4536 3474 const char *prev_field_name = NULL;
a67ba386 3475 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3476 int ret = 0;
3477 int i;
3478
6c8c025b
MD		 3479 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3480 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3481
51ef4536 3482 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3483 if (ret)
3484 return ret;
c099397a
MD		 3485 }
3486 return ret;
3487}
3488
d83004aa
JD		 3489/*
3490 * Must be called with sessions_mutex held.
8b97fd42
MD		 3491 * The entire event metadata is printed as a single atomic metadata
3492 * transaction.
d83004aa 3493 */
c099397a 3494static
ee7e9a18 3495int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event)
c099397a 3496{
ee7e9a18
MD		 3497 struct lttng_kernel_event_recorder *event_recorder;
3498 struct lttng_kernel_channel_buffer *chan;
3499 struct lttng_kernel_session *session;
c099397a
MD		 3500 int ret = 0;
3501
ee7e9a18
MD		 3502 if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER)
3503 return 0;
3504 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3505 chan = event_recorder->chan;
3506 session = chan->parent.session;
3507
a67ba386 3508 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3509 return 0;
f7d06400 3510 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3511 return 0;
3512
8b97fd42
MD		 3513 lttng_metadata_begin(session);
3514
c099397a
MD		 3515 ret = lttng_metadata_printf(session,
3516 "event {\n"
ae734547 3517 " name = \"%s\";\n"
c099397a 3518 " id = %u;\n"
b9074a1b 3519 " stream_id = %u;\n",
a67ba386
MD		 3520 event_recorder->priv->parent.desc->event_name,
3521 event_recorder->priv->id,
f7d06400 3522 event_recorder->chan->priv->id);
c099397a
MD		 3523 if (ret)
3524 goto end;
3525
8070f5c0 3526 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3527 " fields := struct {\n"
3528 );
3529 if (ret)
3530 goto end;
3531
a67ba386 3532 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3533 if (ret)
3534 goto end;
3535
3536 /*
3537 * LTTng space reservation can only reserve multiples of the
3538 * byte size.
3539 */
3540 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3541 " };\n"
3542 "};\n\n");
c099397a
MD		 3543 if (ret)
3544 goto end;
3545
a67ba386 3546 event_recorder->priv->metadata_dumped = 1;
c099397a 3547end:
8b97fd42 3548 lttng_metadata_end(session);
c099397a
MD		 3549 return ret;
3550
3551}
3552
d83004aa
JD		 3553/*
3554 * Must be called with sessions_mutex held.
8b97fd42
MD		 3555 * The entire channel metadata is printed as a single atomic metadata
3556 * transaction.
d83004aa 3557 */
c099397a 3558static
8cdc1a81 3559int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3560 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3561{
3562 int ret = 0;
3563
f7d06400 3564 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3565 return 0;
d83004aa 3566
f7d06400 3567 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3568 return 0;
3569
8b97fd42
MD		 3570 lttng_metadata_begin(session);
3571
f7d06400 3572 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3573 ret = lttng_metadata_printf(session,
3574 "stream {\n"
3575 " id = %u;\n"
9115fbdc 3576 " event.header := %s;\n"
b9074a1b 3577 " packet.context := struct packet_context;\n",
f7d06400
MD		 3578 chan->priv->id,
3579 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3580 "struct event_header_large");
3581 if (ret)
3582 goto end;
3583
f7d06400 3584 if (chan->priv->ctx) {
b9074a1b
MD		 3585 ret = lttng_metadata_printf(session,
3586 " event.context := struct {\n");
3587 if (ret)
3588 goto end;
3589 }
f7d06400 3590 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3591 if (ret)
3592 goto end;
f7d06400 3593 if (chan->priv->ctx) {
b9074a1b
MD		 3594 ret = lttng_metadata_printf(session,
3595 " };\n");
3596 if (ret)
3597 goto end;
3598 }
8070f5c0
MD		 3599
3600 ret = lttng_metadata_printf(session,
b9074a1b 3601 "};\n\n");
8070f5c0 3602
f7d06400 3603 chan->priv->metadata_dumped = 1;
c099397a 3604end:
8b97fd42 3605 lttng_metadata_end(session);
c099397a
MD		 3606 return ret;
3607}
3608
d83004aa
JD		 3609/*
3610 * Must be called with sessions_mutex held.
3611 */
9115fbdc 3612static
8cdc1a81 3613int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3614{
3615 return lttng_metadata_printf(session,
3616 "struct packet_context {\n"
a3ccff4f
MD		 3617 " uint64_clock_monotonic_t timestamp_begin;\n"
3618 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3619 " uint64_t content_size;\n"
3620 " uint64_t packet_size;\n"
5b3cf4f9 3621 " uint64_t packet_seq_num;\n"
a9afe705 3622 " unsigned long events_discarded;\n"
9115fbdc 3623 " uint32_t cpu_id;\n"
c6dfdf6f 3624 "};\n\n"
9115fbdc
MD		 3625 );
3626}
3627
3628/*
3629 * Compact header:
3630 * id: range: 0 - 30.
3631 * id 31 is reserved to indicate an extended header.
3632 *
3633 * Large header:
3634 * id: range: 0 - 65534.
3635 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3636 *
3637 * Must be called with sessions_mutex held.
9115fbdc
MD		 3638 */
3639static
8cdc1a81 3640int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3641{
3642 return lttng_metadata_printf(session,
3643 "struct event_header_compact {\n"
3644 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3645 " variant <id> {\n"
3646 " struct {\n"
a3ccff4f 3647 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3648 " } compact;\n"
3649 " struct {\n"
3650 " uint32_t id;\n"
a3ccff4f 3651 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3652 " } extended;\n"
3653 " } v;\n"
3654 "} align(%u);\n"
3655 "\n"
3656 "struct event_header_large {\n"
3657 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3658 " variant <id> {\n"
3659 " struct {\n"
a3ccff4f 3660 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3661 " } compact;\n"
3662 " struct {\n"
3663 " uint32_t id;\n"
a3ccff4f 3664 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3665 " } extended;\n"
3666 " } v;\n"
3667 "} align(%u);\n\n",
a90917c3
MD		 3668 lttng_alignof(uint32_t) * CHAR_BIT,
3669 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3670 );
3671}
3672
a3ccff4f
MD		 3673 /*
3674 * Approximation of NTP time of day to clock monotonic correlation,
3675 * taken at start of trace.
3676 * Yes, this is only an approximation. Yes, we can (and will) do better
3677 * in future versions.
5283350b
MD		 3678 * This function may return a negative offset. It may happen if the
3679 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3680 *
3681 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3682 * y2038 compliant.
a3ccff4f
MD		 3683 */
3684static
8967b2a3 3685int64_t measure_clock_offset(void)
a3ccff4f 3686{
dcb93448 3687 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3688 uint64_t tcf = trace_clock_freq();
dcb93448 3689 int64_t offset;
a3ccff4f 3690 unsigned long flags;
3636085f
MJ		 3691#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3692 struct timespec64 rts = { 0, 0 };
3693#else
3694 struct timespec rts = { 0, 0 };
3695#endif
a3ccff4f
MD		 3696
3697 /* Disable interrupts to increase correlation precision. */
3698 local_irq_save(flags);
3699 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3700#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3701 ktime_get_real_ts64(&rts);
3702#else
216b6baa 3703 getnstimeofday(&rts);
3636085f 3704#endif
a3ccff4f
MD		 3705 monotonic[1] = trace_clock_read64();
3706 local_irq_restore(flags);
3707
dcb93448 3708 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3709 realtime = (uint64_t) rts.tv_sec * tcf;
3710 if (tcf == NSEC_PER_SEC) {
3711 realtime += rts.tv_nsec;
3712 } else {
3713 uint64_t n = rts.tv_nsec * tcf;
3714
3715 do_div(n, NSEC_PER_SEC);
3716 realtime += n;
3717 }
dcb93448 3718 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3719 return offset;
3720}
3721
3eb95be4 3722static
8cdc1a81 3723int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3724{
0f3eaad4 3725 int ret = 0;
3eb95be4
JR		 3726 size_t i;
3727 char cur;
3728
3729 i = 0;
3730 cur = string[i];
3731 while (cur != '\0') {
3732 switch (cur) {
3733 case '\n':
3734 ret = lttng_metadata_printf(session, "%s", "\\n");
3735 break;
3736 case '\\':
3737 case '"':
3738 ret = lttng_metadata_printf(session, "%c", '\\');
3739 if (ret)
3740 goto error;
3741 /* We still print the current char */
c190d76e 3742 lttng_fallthrough;
3eb95be4
JR		 3743 default:
3744 ret = lttng_metadata_printf(session, "%c", cur);
3745 break;
3746 }
3747
3748 if (ret)
3749 goto error;
3750
3751 cur = string[++i];
3752 }
3753error:
3754 return ret;
3755}
3756
3757static
8cdc1a81 3758int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3759 const char *field_value)
3eb95be4
JR		 3760{
3761 int ret;
3762
1c88f269 3763 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3764 if (ret)
3765 goto error;
3766
1c88f269 3767 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3768 if (ret)
3769 goto error;
3770
3771 ret = lttng_metadata_printf(session, "\";\n");
3772
3773error:
3774 return ret;
3775}
3776
c099397a
MD		 3777/*
3778 * Output metadata into this session's metadata buffers.
d83004aa 3779 * Must be called with sessions_mutex held.
c099397a
MD		 3780 */
3781static
8cdc1a81 3782int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3783{
8cdc1a81 3784 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3785 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3786 const char *product_uuid;
f7d06400 3787 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3788 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3789 int ret = 0;
3790
585e5dcc 3791 if (!LTTNG_READ_ONCE(session->active))
c099397a 3792 return 0;
8b97fd42
MD		 3793
3794 lttng_metadata_begin(session);
3795
8cdc1a81 3796 if (session->priv->metadata_dumped)
c099397a 3797 goto skip_session;
c099397a 3798
d793d5e1 3799 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3800 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3801 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3802 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3803 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3804 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3805
3806 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3807 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3808 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3809 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3810 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3811 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3812 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3813 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3814 "\n"
3815 "trace {\n"
3816 " major = %u;\n"
3817 " minor = %u;\n"
30bdb6e4 3818 " uuid = \"%s\";\n"
d793d5e1
MD		 3819 " byte_order = %s;\n"
3820 " packet.header := struct {\n"
3821 " uint32_t magic;\n"
1ec3f75a 3822 " uint8_t uuid[16];\n"
d793d5e1 3823 " uint32_t stream_id;\n"
5594698f 3824 " uint64_t stream_instance_id;\n"
0eb25f58 3825 " };\n"
d793d5e1 3826 "};\n\n",
a90917c3
MD		 3827 lttng_alignof(uint8_t) * CHAR_BIT,
3828 lttng_alignof(uint16_t) * CHAR_BIT,
3829 lttng_alignof(uint32_t) * CHAR_BIT,
3830 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3831 sizeof(unsigned long) * CHAR_BIT,
3832 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3833 CTF_SPEC_MAJOR,
3834 CTF_SPEC_MINOR,
d793d5e1 3835 uuid_s,
5214fa50 3836#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3837 "be"
3838#else
3839 "le"
3840#endif
3841 );
3842 if (ret)
3843 goto end;
3844
99dc9597
MD		 3845 ret = lttng_metadata_printf(session,
3846 "env {\n"
a6058143 3847 " hostname = \"%s\";\n"
c6c9e10f 3848 " domain = \"kernel\";\n"
99dc9597 3849 " sysname = \"%s\";\n"
c6c9e10f
MD		 3850 " kernel_release = \"%s\";\n"
3851 " kernel_version = \"%s\";\n"
3852 " tracer_name = \"lttng-modules\";\n"
3853 " tracer_major = %d;\n"
3854 " tracer_minor = %d;\n"
3855 " tracer_patchlevel = %d;\n"
3eb95be4 3856 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3857 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3858 utsname()->sysname,
3859 utsname()->release,
c6c9e10f
MD		 3860 utsname()->version,
3861 LTTNG_MODULES_MAJOR_VERSION,
3862 LTTNG_MODULES_MINOR_VERSION,
3863 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3864 );
3865 if (ret)
3866 goto end;
3867
8cdc1a81 3868 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 3869 if (ret)
3870 goto end;
3871 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 3872 session->priv->creation_time);
3eb95be4
JR		 3873 if (ret)
3874 goto end;
3875
c88f762e
GB		 3876 /* Add the product UUID to the 'env' section */
3877 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3878 if (product_uuid) {
3879 ret = lttng_metadata_printf(session,
3880 " product_uuid = \"%s\";\n",
3881 product_uuid
3882 );
3883 if (ret)
3884 goto end;
3885 }
3886
3887 /* Close the 'env' section */
3eb95be4
JR		 3888 ret = lttng_metadata_printf(session, "};\n\n");
3889 if (ret)
3890 goto end;
3891
a3ccff4f
MD		 3892 ret = lttng_metadata_printf(session,
3893 "clock {\n"
2754583e
MD		 3894 " name = \"%s\";\n",
3895 trace_clock_name()
a82c63f1
MD		 3896 );
3897 if (ret)
3898 goto end;
3899
3900 if (!trace_clock_uuid(clock_uuid_s)) {
3901 ret = lttng_metadata_printf(session,
7c27cb17 3902 " uuid = \"%s\";\n",
a82c63f1
MD		 3903 clock_uuid_s
3904 );
3905 if (ret)
3906 goto end;
3907 }
3908
3909 ret = lttng_metadata_printf(session,
2754583e 3910 " description = \"%s\";\n"
a3ccff4f
MD		 3911 " freq = %llu; /* Frequency, in Hz */\n"
3912 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 3913 " offset = %lld;\n"
a3ccff4f 3914 "};\n\n",
2754583e 3915 trace_clock_description(),
a3ccff4f 3916 (unsigned long long) trace_clock_freq(),
8967b2a3 3917 (long long) measure_clock_offset()
a3ccff4f
MD		 3918 );
3919 if (ret)
3920 goto end;
3921
3922 ret = lttng_metadata_printf(session,
3923 "typealias integer {\n"
3924 " size = 27; align = 1; signed = false;\n"
2754583e 3925 " map = clock.%s.value;\n"
a3ccff4f
MD		 3926 "} := uint27_clock_monotonic_t;\n"
3927 "\n"
3928 "typealias integer {\n"
3929 " size = 32; align = %u; signed = false;\n"
2754583e 3930 " map = clock.%s.value;\n"
a3ccff4f
MD		 3931 "} := uint32_clock_monotonic_t;\n"
3932 "\n"
3933 "typealias integer {\n"
3934 " size = 64; align = %u; signed = false;\n"
2754583e 3935 " map = clock.%s.value;\n"
a3ccff4f 3936 "} := uint64_clock_monotonic_t;\n\n",
2754583e 3937 trace_clock_name(),
a3ccff4f 3938 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 3939 trace_clock_name(),
3940 lttng_alignof(uint64_t) * CHAR_BIT,
3941 trace_clock_name()
a3ccff4f
MD		 3942 );
3943 if (ret)
3944 goto end;
3945
a90917c3 3946 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 3947 if (ret)
3948 goto end;
3949
a90917c3 3950 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 3951 if (ret)
3952 goto end;
3953
c099397a 3954skip_session:
f7d06400
MD		 3955 list_for_each_entry(chan_priv, &session->priv->chan, node) {
3956 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 3957 if (ret)
3958 goto end;
3959 }
3960
f237aef8 3961 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
ee7e9a18 3962 ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent);
c099397a
MD		 3963 if (ret)
3964 goto end;
3965 }
8cdc1a81 3966 session->priv->metadata_dumped = 1;
c099397a 3967end:
8b97fd42 3968 lttng_metadata_end(session);
c099397a
MD		 3969 return ret;
3970}
3971
c0e31d2e 3972/**
a90917c3 3973 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 3974 * @transport: transport structure
3975 *
3976 * Registers a transport which can be used as output to extract the data out of
3977 * LTTng. The module calling this registration function must ensure that no
3978 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 3979 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 3980 * is made visible to the transport function. This registration acts as a
263b6c88 3981 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 3982 * after its registration must it synchronize the TLBs.
3983 */
a90917c3 3984void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 3985{
3986 /*
3987 * Make sure no page fault can be triggered by the module about to be
3988 * registered. We deal with this here so we don't have to call
263b6c88 3989 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 3990 */
263b6c88 3991 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 3992
3993 mutex_lock(&sessions_mutex);
a90917c3 3994 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 3995 mutex_unlock(&sessions_mutex);
3996}
a90917c3 3997EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 3998
3999/**
a90917c3 4000 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4001 * @transport: transport structure
4002 */
a90917c3 4003void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4004{
4005 mutex_lock(&sessions_mutex);
4006 list_del(&transport->node);
4007 mutex_unlock(&sessions_mutex);
4008}
a90917c3 4009EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4010
a101fa10
MD		 4011void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4012{
4013 /*
4014 * Make sure no page fault can be triggered by the module about to be
4015 * registered. We deal with this here so we don't have to call
4016 * vmalloc_sync_mappings() in each module's init.
4017 */
4018 wrapper_vmalloc_sync_mappings();
4019
4020 mutex_lock(&sessions_mutex);
4021 list_add_tail(&transport->node, &lttng_counter_transport_list);
4022 mutex_unlock(&sessions_mutex);
4023}
4024EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4025
4026void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4027{
4028 mutex_lock(&sessions_mutex);
4029 list_del(&transport->node);
4030 mutex_unlock(&sessions_mutex);
4031}
4032EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4033
5f4c791e 4034#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4035
4036enum cpuhp_state lttng_hp_prepare;
4037enum cpuhp_state lttng_hp_online;
4038
4039static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4040{
4041 struct lttng_cpuhp_node *lttng_node;
4042
4043 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4044 switch (lttng_node->component) {
4045 case LTTNG_RING_BUFFER_FRONTEND:
4046 return 0;
4047 case LTTNG_RING_BUFFER_BACKEND:
4048 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4049 case LTTNG_RING_BUFFER_ITER:
4050 return 0;
4051 case LTTNG_CONTEXT_PERF_COUNTERS:
4052 return 0;
4053 default:
4054 return -EINVAL;
4055 }
4056}
4057
4058static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4059{
4060 struct lttng_cpuhp_node *lttng_node;
4061
4062 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4063 switch (lttng_node->component) {
4064 case LTTNG_RING_BUFFER_FRONTEND:
4065 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4066 case LTTNG_RING_BUFFER_BACKEND:
4067 return 0;
4068 case LTTNG_RING_BUFFER_ITER:
4069 return 0;
4070 case LTTNG_CONTEXT_PERF_COUNTERS:
4071 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4072 default:
4073 return -EINVAL;
4074 }
4075}
4076
4077static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4078{
4079 struct lttng_cpuhp_node *lttng_node;
4080
4081 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4082 switch (lttng_node->component) {
4083 case LTTNG_RING_BUFFER_FRONTEND:
4084 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4085 case LTTNG_RING_BUFFER_BACKEND:
4086 return 0;
4087 case LTTNG_RING_BUFFER_ITER:
4088 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4089 case LTTNG_CONTEXT_PERF_COUNTERS:
4090 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4091 default:
4092 return -EINVAL;
4093 }
4094}
4095
4096static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4097{
4098 struct lttng_cpuhp_node *lttng_node;
4099
4100 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4101 switch (lttng_node->component) {
4102 case LTTNG_RING_BUFFER_FRONTEND:
4103 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4104 case LTTNG_RING_BUFFER_BACKEND:
4105 return 0;
4106 case LTTNG_RING_BUFFER_ITER:
4107 return 0;
4108 case LTTNG_CONTEXT_PERF_COUNTERS:
4109 return 0;
4110 default:
4111 return -EINVAL;
4112 }
4113}
4114
4115static int __init lttng_init_cpu_hotplug(void)
4116{
4117 int ret;
4118
4119 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4120 lttng_hotplug_prepare,
4121 lttng_hotplug_dead);
4122 if (ret < 0) {
4123 return ret;
4124 }
4125 lttng_hp_prepare = ret;
4126 lttng_rb_set_hp_prepare(ret);
4127
4128 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4129 lttng_hotplug_online,
4130 lttng_hotplug_offline);
4131 if (ret < 0) {
4132 cpuhp_remove_multi_state(lttng_hp_prepare);
4133 lttng_hp_prepare = 0;
4134 return ret;
4135 }
4136 lttng_hp_online = ret;
4137 lttng_rb_set_hp_online(ret);
4138
4139 return 0;
4140}
4141
4142static void __exit lttng_exit_cpu_hotplug(void)
4143{
4144 lttng_rb_set_hp_online(0);
4145 cpuhp_remove_multi_state(lttng_hp_online);
4146 lttng_rb_set_hp_prepare(0);
4147 cpuhp_remove_multi_state(lttng_hp_prepare);
4148}
4149
5f4c791e 4150#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4151static int lttng_init_cpu_hotplug(void)
4152{
4153 return 0;
4154}
4155static void lttng_exit_cpu_hotplug(void)
4156{
4157}
5f4c791e 4158#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4159
a90917c3 4160static int __init lttng_events_init(void)
4e3c1b9b 4161{
1c25284c
MD		 4162 int ret;
4163
453b2495
JD		 4164 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4165 if (ret)
4166 return ret;
389d7070 4167 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4168 if (ret)
4169 return ret;
4170 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4171 if (ret)
4172 return ret;
4173 ret = lttng_probes_init();
389d7070
MD		 4174 if (ret)
4175 return ret;
07dfc1d0 4176 ret = lttng_context_init();
20591cf7
MD		 4177 if (ret)
4178 return ret;
07dfc1d0
MD		 4179 ret = lttng_tracepoint_init();
4180 if (ret)
4181 goto error_tp;
a67ba386
MD		 4182 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4183 if (!event_recorder_cache) {
20591cf7 4184 ret = -ENOMEM;
a67ba386 4185 goto error_kmem_event_recorder;
dffef45d 4186 }
a67ba386
MD		 4187 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4188 if (!event_recorder_private_cache) {
4189 ret = -ENOMEM;
4190 goto error_kmem_event_recorder_private;
4191 }
4192 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4193 if (!event_notifier_cache) {
4194 ret = -ENOMEM;
4195 goto error_kmem_event_notifier;
20591cf7 4196 }
a67ba386
MD		 4197 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4198 if (!event_notifier_private_cache) {
4199 ret = -ENOMEM;
4200 goto error_kmem_event_notifier_private;
4201 }
80996790 4202 ret = lttng_abi_init();
02119ee5
MD		 4203 if (ret)
4204 goto error_abi;
0c956676
MD		 4205 ret = lttng_logger_init();
4206 if (ret)
4207 goto error_logger;
1e367326
MD		 4208 ret = lttng_init_cpu_hotplug();
4209 if (ret)
4210 goto error_hotplug;
101215b7 4211 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4212 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4213 __stringify(LTTNG_MODULES_MINOR_VERSION),
4214 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4215 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4216 LTTNG_VERSION_NAME,
4217#ifdef LTTNG_EXTRA_VERSION_GIT
4218 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4219#else
4220 "",
4221#endif
4222#ifdef LTTNG_EXTRA_VERSION_NAME
4223 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4224#else
4225 "");
4226#endif
c1551e57
MJ		 4227#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4228 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4229#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4230 return 0;
0c956676 4231
1e367326
MD		 4232error_hotplug:
4233 lttng_logger_exit();
0c956676
MD		 4234error_logger:
4235 lttng_abi_exit();
02119ee5 4236error_abi:
a67ba386
MD		 4237 kmem_cache_destroy(event_notifier_private_cache);
4238error_kmem_event_notifier_private:
dffef45d
FD		 4239 kmem_cache_destroy(event_notifier_cache);
4240error_kmem_event_notifier:
a67ba386
MD		 4241 kmem_cache_destroy(event_recorder_private_cache);
4242error_kmem_event_recorder_private:
4243 kmem_cache_destroy(event_recorder_cache);
4244error_kmem_event_recorder:
20591cf7 4245 lttng_tracepoint_exit();
07dfc1d0
MD		 4246error_tp:
4247 lttng_context_exit();
101215b7 4248 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4249 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4250 __stringify(LTTNG_MODULES_MINOR_VERSION),
4251 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4252 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4253 LTTNG_VERSION_NAME,
4254#ifdef LTTNG_EXTRA_VERSION_GIT
4255 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4256#else
4257 "",
4258#endif
4259#ifdef LTTNG_EXTRA_VERSION_NAME
4260 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4261#else
4262 "");
4263#endif
1c25284c 4264 return ret;
4e3c1b9b
MD		 4265}
4266
a90917c3 4267module_init(lttng_events_init);
11b5a3c2 4268
a90917c3 4269static void __exit lttng_events_exit(void)
4e3c1b9b 4270{
8cdc1a81 4271 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4272
1e367326 4273 lttng_exit_cpu_hotplug();
0c956676 4274 lttng_logger_exit();
80996790 4275 lttng_abi_exit();
8cdc1a81
MD		 4276 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4277 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4278 kmem_cache_destroy(event_recorder_cache);
4279 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4280 kmem_cache_destroy(event_notifier_cache);
a67ba386 4281 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4282 lttng_tracepoint_exit();
07dfc1d0 4283 lttng_context_exit();
101215b7 4284 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4285 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4286 __stringify(LTTNG_MODULES_MINOR_VERSION),
4287 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4288 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4289 LTTNG_VERSION_NAME,
4290#ifdef LTTNG_EXTRA_VERSION_GIT
4291 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4292#else
4293 "",
4294#endif
4295#ifdef LTTNG_EXTRA_VERSION_NAME
4296 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4297#else
4298 "");
4299#endif
4e3c1b9b 4300}
92e94819 4301
a90917c3 4302module_exit(lttng_events_exit);
11b5a3c2 4303
7ca11e77 4304#include <generated/patches.h>
101215b7
MJ		 4305#ifdef LTTNG_EXTRA_VERSION_GIT
4306MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4307#endif
4308#ifdef LTTNG_EXTRA_VERSION_NAME
4309MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4310#endif
92e94819
MD		 4311MODULE_LICENSE("GPL and additional rights");
4312MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4313MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4314MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4315 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4316 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4317 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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