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Drop 'asm/barrier.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>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
c190d76e 31#include <wrapper/compiler_attributes.h>
a7008254 32#include <wrapper/uuid.h>
263b6c88 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 34#include <wrapper/random.h>
35#include <wrapper/tracepoint.h>
36#include <wrapper/list.h>
cbc19040 37#include <wrapper/types.h>
2df37e95
MD		 38#include <lttng/kernel-version.h>
39#include <lttng/events.h>
92bc1e23 40#include <lttng/events-internal.h>
0b365677 41#include <lttng/lttng-bytecode.h>
2df37e95 42#include <lttng/tracer.h>
21f58fb7 43#include <lttng/event-notifier-notification.h>
2df37e95
MD		 44#include <lttng/abi-old.h>
45#include <lttng/endian.h>
46#include <lttng/string-utils.h>
4a11ef1c 47#include <lttng/utils.h>
24591303
MD		 48#include <ringbuffer/backend.h>
49#include <ringbuffer/frontend.h>
3636085f 50#include <wrapper/time.h>
4e3c1b9b 51
5987e66c
MJ		 52#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0))
53#include <linux/stdarg.h>
54#else
55#include <stdarg.h>
56#endif
57
d83004aa
JD		 58#define METADATA_CACHE_DEFAULT_SIZE 4096
59
4e3c1b9b 60static LIST_HEAD(sessions);
750b05f2 61static LIST_HEAD(event_notifier_groups);
a90917c3 62static LIST_HEAD(lttng_transport_list);
a101fa10 63static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 64/*
65 * Protect the sessions and metadata caches.
66 */
4e3c1b9b 67static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 68static struct kmem_cache *event_recorder_cache;
69static struct kmem_cache *event_recorder_private_cache;
dffef45d 70static struct kmem_cache *event_notifier_cache;
a67ba386 71static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 72
8cdc1a81
MD		 73static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
74static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b01155ba 75static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
7b25ab0e 76static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
3c997079 77
0648898e 78static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
f7d06400 79static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
6a338ba4 80static void _lttng_event_unregister(struct lttng_kernel_event_common *event);
c099397a 81static
ee7e9a18 82int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event);
c099397a 83static
8cdc1a81 84int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 85static
86void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 87static
8cdc1a81 88int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 89 const struct lttng_kernel_type_common *type,
90 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 91 size_t nesting);
92static
8cdc1a81 93int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 94 const struct lttng_kernel_event_field *field,
51ef4536 95 size_t nesting, const char **prev_field_name_p);
c099397a 96
c099397a 97void synchronize_trace(void)
abcca994 98{
05355f0b
MJ		 99#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
100 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 101 synchronize_rcu();
102#else
abcca994 103 synchronize_sched();
92da05ce
MJ		 104#endif
105
5f4c791e 106#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 107#ifdef CONFIG_PREEMPT_RT_FULL
108 synchronize_rcu();
109#endif
5f4c791e 110#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 111#ifdef CONFIG_PREEMPT_RT
112 synchronize_rcu();
113#endif
5f4c791e 114#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 115}
116
3c997079
MD		 117void lttng_lock_sessions(void)
118{
119 mutex_lock(&sessions_mutex);
120}
121
122void lttng_unlock_sessions(void)
123{
124 mutex_unlock(&sessions_mutex);
125}
126
9fe593d2
FD		 127static struct lttng_transport *lttng_transport_find(const char *name)
128{
129 struct lttng_transport *transport;
130
131 list_for_each_entry(transport, &lttng_transport_list, node) {
132 if (!strcmp(transport->name, name))
133 return transport;
134 }
135 return NULL;
136}
137
3c997079
MD		 138/*
139 * Called with sessions lock held.
140 */
141int lttng_session_active(void)
142{
8cdc1a81 143 struct lttng_kernel_session_private *iter;
3c997079
MD		 144
145 list_for_each_entry(iter, &sessions, list) {
8cdc1a81 146 if (iter->pub->active)
3c997079
MD		 147 return 1;
148 }
149 return 0;
150}
151
8cdc1a81 152struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 153{
8cdc1a81
MD		 154 struct lttng_kernel_session *session;
155 struct lttng_kernel_session_private *session_priv;
d83004aa 156 struct lttng_metadata_cache *metadata_cache;
3c997079 157 int i;
4e3c1b9b
MD		 158
159 mutex_lock(&sessions_mutex);
8cdc1a81 160 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 161 if (!session)
d83004aa 162 goto err;
8cdc1a81
MD		 163 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
164 if (!session_priv)
165 goto err_free_session;
166 session->priv = session_priv;
167 session_priv->pub = session;
168
169 INIT_LIST_HEAD(&session_priv->chan);
170 INIT_LIST_HEAD(&session_priv->events);
171 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 172
173 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
174 GFP_KERNEL);
175 if (!metadata_cache)
8cdc1a81 176 goto err_free_session_private;
0ca42eb7 177 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 178 if (!metadata_cache->data)
179 goto err_free_cache;
180 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
181 kref_init(&metadata_cache->refcount);
92d9f5e6 182 mutex_init(&metadata_cache->lock);
8cdc1a81 183 session_priv->metadata_cache = metadata_cache;
d83004aa 184 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
8cdc1a81 185 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 186 sizeof(metadata_cache->uuid));
8cdc1a81 187 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 188 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
8cdc1a81
MD		 189 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
190 list_add(&session_priv->list, &sessions);
191
8c0393c3
MD		 192 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
193 goto tracker_alloc_error;
194 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
195 goto tracker_alloc_error;
196 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
197 goto tracker_alloc_error;
198 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
199 goto tracker_alloc_error;
200 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
201 goto tracker_alloc_error;
202 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
203 goto tracker_alloc_error;
204
4e3c1b9b 205 mutex_unlock(&sessions_mutex);
8cdc1a81 206
4e3c1b9b 207 return session;
d83004aa 208
8c0393c3
MD		 209tracker_alloc_error:
210 lttng_id_tracker_fini(&session->pid_tracker);
211 lttng_id_tracker_fini(&session->vpid_tracker);
212 lttng_id_tracker_fini(&session->uid_tracker);
213 lttng_id_tracker_fini(&session->vuid_tracker);
214 lttng_id_tracker_fini(&session->gid_tracker);
215 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 216err_free_cache:
217 kfree(metadata_cache);
8cdc1a81
MD		 218err_free_session_private:
219 lttng_kvfree(session_priv);
d83004aa 220err_free_session:
48f5e0b5 221 lttng_kvfree(session);
d83004aa
JD		 222err:
223 mutex_unlock(&sessions_mutex);
224 return NULL;
225}
226
99f52fcc
FD		 227static
228struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
229{
230 struct lttng_counter_transport *transport;
231
232 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
233 if (!strcmp(transport->name, name))
234 return transport;
235 }
236 return NULL;
237}
238
239struct lttng_counter *lttng_kernel_counter_create(
240 const char *counter_transport_name,
241 size_t number_dimensions, const size_t *dimensions_sizes)
242{
243 struct lttng_counter *counter = NULL;
244 struct lttng_counter_transport *counter_transport = NULL;
245
246 counter_transport = lttng_counter_transport_find(counter_transport_name);
247 if (!counter_transport) {
248 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
249 counter_transport_name);
250 goto notransport;
251 }
252 if (!try_module_get(counter_transport->owner)) {
253 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
254 goto notransport;
255 }
256
257 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
258 if (!counter)
259 goto nomem;
260
261 /* Create event notifier error counter. */
262 counter->ops = &counter_transport->ops;
263 counter->transport = counter_transport;
264
265 counter->counter = counter->ops->counter_create(
266 number_dimensions, dimensions_sizes, 0);
267 if (!counter->counter) {
268 goto create_error;
269 }
270
271 return counter;
272
273create_error:
274 lttng_kvfree(counter);
275nomem:
276 if (counter_transport)
277 module_put(counter_transport->owner);
278notransport:
279 return NULL;
280}
281
750b05f2
FD		 282struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
283{
284 struct lttng_transport *transport = NULL;
285 struct lttng_event_notifier_group *event_notifier_group;
286 const char *transport_name = "relay-event-notifier";
287 size_t subbuf_size = 4096; //TODO
288 size_t num_subbuf = 16; //TODO
289 unsigned int switch_timer_interval = 0;
290 unsigned int read_timer_interval = 0;
dffef45d 291 int i;
750b05f2
FD		 292
293 mutex_lock(&sessions_mutex);
294
295 transport = lttng_transport_find(transport_name);
296 if (!transport) {
297 printk(KERN_WARNING "LTTng: transport %s not found\n",
298 transport_name);
299 goto notransport;
300 }
301 if (!try_module_get(transport->owner)) {
302 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
303 transport_name);
304 goto notransport;
305 }
306
307 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
308 GFP_KERNEL);
309 if (!event_notifier_group)
310 goto nomem;
311
312 /*
313 * Initialize the ring buffer used to store event notifier
314 * notifications.
315 */
316 event_notifier_group->ops = &transport->ops;
4a399b76 317 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 318 transport_name, event_notifier_group, NULL,
319 subbuf_size, num_subbuf, switch_timer_interval,
320 read_timer_interval);
321 if (!event_notifier_group->chan)
322 goto create_error;
323
324 event_notifier_group->transport = transport;
dffef45d
FD		 325
326 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
327 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
33af697f
MD		 328 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
329 INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]);
dffef45d 330
750b05f2
FD		 331 list_add(&event_notifier_group->node, &event_notifier_groups);
332
333 mutex_unlock(&sessions_mutex);
334
335 return event_notifier_group;
336
337create_error:
338 lttng_kvfree(event_notifier_group);
339nomem:
340 if (transport)
341 module_put(transport->owner);
342notransport:
343 mutex_unlock(&sessions_mutex);
344 return NULL;
345}
346
d83004aa
JD		 347void metadata_cache_destroy(struct kref *kref)
348{
349 struct lttng_metadata_cache *cache =
350 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 351 vfree(cache->data);
d83004aa 352 kfree(cache);
4e3c1b9b
MD		 353}
354
8cdc1a81 355void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 356{
f7d06400 357 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 358 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 359 struct lttng_metadata_stream *metadata_stream;
09710b83 360 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
dda6a249 361 int ret;
4e3c1b9b
MD		 362
363 mutex_lock(&sessions_mutex);
a8f2d0c7 364 WRITE_ONCE(session->active, 0);
f7d06400 365 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 366 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 367 WARN_ON(ret);
368 }
6a338ba4
MD		 369 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node)
370 _lttng_event_unregister(&event_recorder_priv->pub->parent);
abcca994 371 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400 372 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 373 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
badfe9f5
MD		 374 WARN_ON(ret);
375 }
09710b83
MD		 376 list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node)
377 lttng_event_enabler_destroy(event_enabler);
f237aef8 378 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node)
0648898e 379 _lttng_event_destroy(&event_recorder_priv->pub->parent);
f7d06400
MD		 380 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
381 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
382 _lttng_channel_destroy(chan_priv->pub);
d83004aa 383 }
8cdc1a81
MD		 384 mutex_lock(&session->priv->metadata_cache->lock);
385 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
d83004aa 386 _lttng_metadata_channel_hangup(metadata_stream);
8cdc1a81 387 mutex_unlock(&session->priv->metadata_cache->lock);
8c0393c3
MD		 388 lttng_id_tracker_fini(&session->pid_tracker);
389 lttng_id_tracker_fini(&session->vpid_tracker);
390 lttng_id_tracker_fini(&session->uid_tracker);
391 lttng_id_tracker_fini(&session->vuid_tracker);
392 lttng_id_tracker_fini(&session->gid_tracker);
393 lttng_id_tracker_fini(&session->vgid_tracker);
8cdc1a81
MD		 394 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
395 list_del(&session->priv->list);
4e3c1b9b 396 mutex_unlock(&sessions_mutex);
8cdc1a81 397 lttng_kvfree(session->priv);
48f5e0b5 398 lttng_kvfree(session);
4e3c1b9b
MD		 399}
400
dffef45d
FD		 401void lttng_event_notifier_group_destroy(
402 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 403{
09710b83 404 struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler;
a67ba386 405 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 406 int ret;
407
750b05f2
FD		 408 if (!event_notifier_group)
409 return;
410
411 mutex_lock(&sessions_mutex);
dffef45d 412
6053e75e 413 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
8a8ac9a8
FD		 414 WARN_ON(ret);
415
a67ba386 416 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
6a338ba4
MD		 417 &event_notifier_group->event_notifiers_head, parent.node)
418 _lttng_event_unregister(&event_notifier_priv->pub->parent);
dffef45d 419
b01155ba
FD		 420 /* Wait for in-flight event notifier to complete */
421 synchronize_trace();
422
21f58fb7
FD		 423 irq_work_sync(&event_notifier_group->wakeup_pending);
424
6053e75e
MD		 425 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
426 WARN_ON(ret);
8a8ac9a8 427
09710b83 428 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
dffef45d 429 &event_notifier_group->enablers_head, node)
09710b83 430 lttng_event_enabler_destroy(event_enabler);
dffef45d 431
a67ba386 432 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
f237aef8 433 &event_notifier_group->event_notifiers_head, parent.node)
0648898e 434 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 435
99f52fcc
FD		 436 if (event_notifier_group->error_counter) {
437 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 438
99f52fcc
FD		 439 error_counter->ops->counter_destroy(error_counter->counter);
440 module_put(error_counter->transport->owner);
441 lttng_kvfree(error_counter);
442 event_notifier_group->error_counter = NULL;
443 }
444
4a399b76 445 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 446 module_put(event_notifier_group->transport->owner);
447 list_del(&event_notifier_group->node);
dffef45d 448
750b05f2
FD		 449 mutex_unlock(&sessions_mutex);
450 lttng_kvfree(event_notifier_group);
451}
452
8cdc1a81 453int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 454{
455 int ret;
456
457 mutex_lock(&sessions_mutex);
458 ret = lttng_statedump_start(session);
459 mutex_unlock(&sessions_mutex);
460 return ret;
461}
462
8cdc1a81 463int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 464{
465 int ret = 0;
f7d06400 466 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 467
468 mutex_lock(&sessions_mutex);
469 if (session->active) {
470 ret = -EBUSY;
471 goto end;
472 }
c099397a 473
3c997079 474 /* Set transient enabler state to "enabled" */
8cdc1a81 475 session->priv->tstate = 1;
3c997079 476
4ef81e4a 477 /* We need to sync enablers with session before activation. */
b2bc0bc8 478 lttng_session_sync_event_enablers(session);
4ef81e4a 479
c099397a
MD		 480 /*
481 * Snapshot the number of events per channel to know the type of header
482 * we need to use.
483 */
f7d06400
MD		 484 list_for_each_entry(chan_priv, &session->priv->chan, node) {
485 if (chan_priv->header_type)
486 continue; /* don't change it if session stop/restart */
487 if (chan_priv->free_event_id < 31)
488 chan_priv->header_type = 1; /* compact */
c099397a 489 else
f7d06400 490 chan_priv->header_type = 2; /* large */
c099397a
MD		 491 }
492
64af2437 493 /* Clear each stream's quiescent state. */
f7d06400
MD		 494 list_for_each_entry(chan_priv, &session->priv->chan, node) {
495 if (chan_priv->channel_type != METADATA_CHANNEL)
496 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 497 }
64af2437 498
a8f2d0c7 499 WRITE_ONCE(session->active, 1);
8cdc1a81 500 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 501 ret = _lttng_session_metadata_statedump(session);
c337ddc2 502 if (ret) {
a8f2d0c7 503 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 504 goto end;
505 }
506 ret = lttng_statedump_start(session);
360f38ea 507 if (ret)
a8f2d0c7 508 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 509end:
510 mutex_unlock(&sessions_mutex);
11b5a3c2 511 return ret;
c0e31d2e
MD		 512}
513
8cdc1a81 514int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 515{
516 int ret = 0;
f7d06400 517 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 518
519 mutex_lock(&sessions_mutex);
520 if (!session->active) {
521 ret = -EBUSY;
522 goto end;
523 }
a8f2d0c7 524 WRITE_ONCE(session->active, 0);
3c997079
MD		 525
526 /* Set transient enabler state to "disabled" */
8cdc1a81 527 session->priv->tstate = 0;
b2bc0bc8 528 lttng_session_sync_event_enablers(session);
64af2437
MD		 529
530 /* Set each stream's quiescent state. */
f7d06400
MD		 531 list_for_each_entry(chan_priv, &session->priv->chan, node) {
532 if (chan_priv->channel_type != METADATA_CHANNEL)
533 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 534 }
c0e31d2e
MD		 535end:
536 mutex_unlock(&sessions_mutex);
11b5a3c2 537 return ret;
c0e31d2e
MD		 538}
539
8cdc1a81 540int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 541{
542 int ret = 0;
f7d06400 543 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 544 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 545 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 546 struct lttng_metadata_stream *stream;
547
548 mutex_lock(&sessions_mutex);
549 if (!session->active) {
550 ret = -EBUSY;
551 goto end;
552 }
553
554 mutex_lock(&cache->lock);
555 memset(cache->data, 0, cache->cache_alloc);
556 cache->metadata_written = 0;
557 cache->version++;
8cdc1a81 558 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 559 stream->metadata_out = 0;
560 stream->metadata_in = 0;
561 }
562 mutex_unlock(&cache->lock);
563
8cdc1a81 564 session->priv->metadata_dumped = 0;
f7d06400
MD		 565 list_for_each_entry(chan_priv, &session->priv->chan, node) {
566 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 567 }
568
f237aef8 569 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
a67ba386 570 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 571 }
572
573 ret = _lttng_session_metadata_statedump(session);
574
575end:
576 mutex_unlock(&sessions_mutex);
577 return ret;
578}
579
6b757027
MD		 580static
581bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
582{
583 struct lttng_kernel_channel_buffer *chan_buf;
584
585 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
586 return false;
587 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
588 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
589 return true;
590 return false;
591}
592
593int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
e64957da 594{
3c997079 595 int ret = 0;
e64957da 596
3c997079 597 mutex_lock(&sessions_mutex);
6b757027 598 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 599 ret = -EPERM;
600 goto end;
601 }
6b757027 602 if (channel->enabled) {
3c997079
MD		 603 ret = -EEXIST;
604 goto end;
605 }
606 /* Set transient enabler state to "enabled" */
6b757027
MD		 607 channel->priv->tstate = 1;
608 lttng_session_sync_event_enablers(channel->session);
3c997079 609 /* Set atomically the state to "enabled" */
6b757027 610 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 611end:
612 mutex_unlock(&sessions_mutex);
613 return ret;
e64957da
MD		 614}
615
6b757027 616int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
e64957da 617{
3c997079 618 int ret = 0;
e64957da 619
3c997079 620 mutex_lock(&sessions_mutex);
6b757027 621 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 622 ret = -EPERM;
623 goto end;
624 }
6b757027 625 if (!channel->enabled) {
3c997079
MD		 626 ret = -EEXIST;
627 goto end;
628 }
629 /* Set atomically the state to "disabled" */
6b757027 630 WRITE_ONCE(channel->enabled, 0);
3c997079 631 /* Set transient enabler state to "enabled" */
6b757027
MD		 632 channel->priv->tstate = 0;
633 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 634end:
635 mutex_unlock(&sessions_mutex);
636 return ret;
e64957da
MD		 637}
638
9d993668 639int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 640{
3c997079 641 int ret = 0;
e64957da 642
3c997079 643 mutex_lock(&sessions_mutex);
9d993668
MD		 644 switch (event->type) {
645 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
646 {
647 struct lttng_kernel_event_recorder *event_recorder =
648 container_of(event, struct lttng_kernel_event_recorder, parent);
649
f7d06400 650 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 651 ret = -EPERM;
652 goto end;
653 }
a0493bef 654 break;
9d993668
MD		 655 }
656 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
657 switch (event->priv->instrumentation) {
658 case LTTNG_KERNEL_ABI_KRETPROBE:
659 ret = -EINVAL;
660 goto end;
661 default:
662 break;
663 }
a0493bef
MD		 664 break;
665 default:
9d993668 666 break;
a0493bef 667 }
e64957da 668
9d993668 669 if (event->enabled) {
3c997079
MD		 670 ret = -EEXIST;
671 goto end;
672 }
a67ba386 673 switch (event->priv->instrumentation) {
c190d76e
MJ		 674 case LTTNG_KERNEL_ABI_TRACEPOINT:
675 lttng_fallthrough;
606828e4 676 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 677 ret = -EINVAL;
678 break;
b4a75708 679
c190d76e
MJ		 680 case LTTNG_KERNEL_ABI_KPROBE:
681 lttng_fallthrough;
606828e4 682 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 683 WRITE_ONCE(event->enabled, 1);
a0493bef 684 break;
b4a75708 685
606828e4 686 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 687 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 688 break;
b4a75708 689
c190d76e
MJ		 690 case LTTNG_KERNEL_ABI_FUNCTION:
691 lttng_fallthrough;
692 case LTTNG_KERNEL_ABI_NOOP:
693 lttng_fallthrough;
a0493bef
MD		 694 default:
695 WARN_ON_ONCE(1);
696 ret = -EINVAL;
697 }
3c997079
MD		 698end:
699 mutex_unlock(&sessions_mutex);
700 return ret;
e64957da
MD		 701}
702
9d993668 703int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 704{
705 int ret = 0;
706
707 mutex_lock(&sessions_mutex);
9d993668
MD		 708 switch (event->type) {
709 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
710 {
711 struct lttng_kernel_event_recorder *event_recorder =
712 container_of(event, struct lttng_kernel_event_recorder, parent);
713
f7d06400 714 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 715 ret = -EPERM;
716 goto end;
717 }
b01155ba 718 break;
9d993668
MD		 719 }
720 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
721 switch (event->priv->instrumentation) {
722 case LTTNG_KERNEL_ABI_KRETPROBE:
723 ret = -EINVAL;
724 goto end;
725 default:
726 break;
727 }
2b16f0c9 728 break;
dffef45d 729 default:
9d993668 730 break;
dffef45d 731 }
dffef45d 732
a67ba386 733 if (!event->enabled) {
dffef45d
FD		 734 ret = -EEXIST;
735 goto end;
736 }
a67ba386 737 switch (event->priv->instrumentation) {
c190d76e
MJ		 738 case LTTNG_KERNEL_ABI_TRACEPOINT:
739 lttng_fallthrough;
606828e4 740 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 741 ret = -EINVAL;
742 break;
b4a75708 743
c190d76e
MJ		 744 case LTTNG_KERNEL_ABI_KPROBE:
745 lttng_fallthrough;
606828e4 746 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 747 WRITE_ONCE(event->enabled, 0);
2b16f0c9 748 break;
b4a75708 749
9d993668
MD		 750 case LTTNG_KERNEL_ABI_KRETPROBE:
751 ret = lttng_kretprobes_event_enable_state(event, 0);
752 break;
753
c190d76e
MJ		 754 case LTTNG_KERNEL_ABI_FUNCTION:
755 lttng_fallthrough;
756 case LTTNG_KERNEL_ABI_NOOP:
757 lttng_fallthrough;
dffef45d
FD		 758 default:
759 WARN_ON_ONCE(1);
760 ret = -EINVAL;
761 }
762end:
763 mutex_unlock(&sessions_mutex);
764 return ret;
765}
766
4e252d1e 767struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 768 const char *transport_name,
769 void *buf_addr,
4e3c1b9b
MD		 770 size_t subbuf_size, size_t num_subbuf,
771 unsigned int switch_timer_interval,
d83004aa
JD		 772 unsigned int read_timer_interval,
773 enum channel_type channel_type)
4e3c1b9b 774{
f7d06400
MD		 775 struct lttng_kernel_channel_buffer *chan;
776 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 777 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 778
779 mutex_lock(&sessions_mutex);
8cdc1a81 780 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 781 goto active; /* Refuse to add channel to active session */
a90917c3 782 transport = lttng_transport_find(transport_name);
f3d01b96 783 if (!transport) {
5a15f70c 784 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 785 transport_name);
c0e31d2e 786 goto notransport;
f3d01b96 787 }
a33c9927 788 if (!try_module_get(transport->owner)) {
5a15f70c 789 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 790 goto notransport;
791 }
f7d06400 792 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 793 if (!chan)
c0e31d2e 794 goto nomem;
f7d06400
MD		 795 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
796 if (!chan_priv)
797 goto nomem_priv;
798 chan->priv = chan_priv;
799 chan_priv->pub = chan;
800 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
801 chan->parent.session = session;
802 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 803 chan->ops = &transport->ops;
125b4df4
MD		 804 /*
805 * Note: the channel creation op already writes into the packet
806 * headers. Therefore the "chan" information used as input
807 * should be already accessible.
808 */
f7d06400 809 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 810 chan, buf_addr, subbuf_size, num_subbuf,
811 switch_timer_interval, read_timer_interval);
f7d06400 812 if (!chan->priv->rb_chan)
f3d01b96 813 goto create_error;
f7d06400
MD		 814 chan->priv->parent.tstate = 1;
815 chan->parent.enabled = 1;
816 chan->priv->transport = transport;
817 chan->priv->channel_type = channel_type;
818 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 819 mutex_unlock(&sessions_mutex);
820 return chan;
821
f3d01b96 822create_error:
f7d06400
MD		 823 kfree(chan_priv);
824nomem_priv:
f3d01b96 825 kfree(chan);
c0e31d2e 826nomem:
a33c9927
MD		 827 if (transport)
828 module_put(transport->owner);
c0e31d2e 829notransport:
e5382b6d 830active:
4e3c1b9b
MD		 831 mutex_unlock(&sessions_mutex);
832 return NULL;
833}
834
835/*
d83004aa
JD		 836 * Only used internally at session destruction for per-cpu channels, and
837 * when metadata channel is released.
838 * Needs to be called with sessions mutex held.
4e3c1b9b 839 */
aa7c23a9 840static
f7d06400 841void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 842{
f7d06400
MD		 843 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
844 module_put(chan->priv->transport->owner);
845 list_del(&chan->priv->node);
846 lttng_kernel_destroy_context(chan->priv->ctx);
847 kfree(chan->priv);
4e3c1b9b
MD		 848 kfree(chan);
849}
850
f7d06400 851void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 852{
f7d06400 853 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 854
855 /* Protect the metadata cache with the sessions_mutex. */
856 mutex_lock(&sessions_mutex);
857 _lttng_channel_destroy(chan);
858 mutex_unlock(&sessions_mutex);
859}
860EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
861
862static
863void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
864{
865 stream->finalized = 1;
866 wake_up_interruptible(&stream->read_wait);
867}
868
51d248b5
MD		 869static
870bool lttng_kernel_event_id_available(struct lttng_event_enabler_common *event_enabler)
871{
872 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
873 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
874
875 switch (event_enabler->enabler_type) {
876 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
877 {
878 struct lttng_event_recorder_enabler *event_recorder_enabler =
879 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
880 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
881
882 switch (itype) {
883 case LTTNG_KERNEL_ABI_TRACEPOINT:
884 lttng_fallthrough;
885 case LTTNG_KERNEL_ABI_KPROBE:
886 lttng_fallthrough;
887 case LTTNG_KERNEL_ABI_SYSCALL:
888 lttng_fallthrough;
889 case LTTNG_KERNEL_ABI_UPROBE:
890 if (chan->priv->free_event_id == -1U)
891 return false;
892 return true;
893 case LTTNG_KERNEL_ABI_KRETPROBE:
894 /* kretprobes require 2 event IDs. */
895 if (chan->priv->free_event_id >= -2U)
896 return false;
897 return true;
898 default:
899 WARN_ON_ONCE(1);
900 return false;
901 }
902 }
903 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
904 return true;
905 default:
906 WARN_ON_ONCE(1);
907 return false;
908 }
909}
910
756a020c
MD		 911static
912struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler)
913{
914 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
915 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
916
917 switch (event_enabler->enabler_type) {
918 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
919 {
920 struct lttng_event_recorder_enabler *event_recorder_enabler =
921 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
922 struct lttng_kernel_event_recorder *event_recorder;
923 struct lttng_kernel_event_recorder_private *event_recorder_priv;
924 struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan;
925
926 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
927 if (!event_recorder)
928 return NULL;
929 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
930 if (!event_recorder_priv) {
931 kmem_cache_free(event_recorder_private_cache, event_recorder);
932 return NULL;
933 }
934 event_recorder_priv->pub = event_recorder;
935 event_recorder_priv->parent.pub = &event_recorder->parent;
936 event_recorder->priv = event_recorder_priv;
937 event_recorder->parent.priv = &event_recorder_priv->parent;
938
939 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
940 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
941 event_recorder->priv->parent.instrumentation = itype;
942 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
943 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
944
945 event_recorder->chan = chan;
946 event_recorder->priv->id = chan->priv->free_event_id++;
947 return &event_recorder->parent;
948 }
949 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
950 {
951 struct lttng_event_notifier_enabler *event_notifier_enabler =
952 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
953 struct lttng_kernel_event_notifier *event_notifier;
954 struct lttng_kernel_event_notifier_private *event_notifier_priv;
955
956 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
957 if (!event_notifier)
958 return NULL;
959 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
960 if (!event_notifier_priv) {
961 kmem_cache_free(event_notifier_private_cache, event_notifier);
962 return NULL;
963 }
964 event_notifier_priv->pub = event_notifier;
965 event_notifier_priv->parent.pub = &event_notifier->parent;
966 event_notifier->priv = event_notifier_priv;
967 event_notifier->parent.priv = &event_notifier_priv->parent;
968
969 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
970 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
971 event_notifier->priv->parent.instrumentation = itype;
972 event_notifier->priv->parent.user_token = event_enabler->user_token;
973 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
974 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
975
976 event_notifier->priv->group = event_notifier_enabler->group;
977 event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index;
978 event_notifier->priv->num_captures = 0;
979 event_notifier->notification_send = lttng_event_notifier_notification_send;
980 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
981 return &event_notifier->parent;
982 }
983 default:
984 return NULL;
985 }
986}
987
988static
989void lttng_kernel_event_free(struct lttng_kernel_event_common *event)
990{
991 switch (event->type) {
992 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
993 {
994 struct lttng_kernel_event_recorder *event_recorder =
995 container_of(event, struct lttng_kernel_event_recorder, parent);
996
997 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
998 kmem_cache_free(event_recorder_cache, event_recorder);
999 break;
1000 }
1001 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1002 {
1003 struct lttng_kernel_event_notifier *event_notifier =
1004 container_of(event, struct lttng_kernel_event_notifier, parent);
1005
1006 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1007 kmem_cache_free(event_notifier_cache, event_notifier);
1008 break;
1009 }
1010 default:
1011 WARN_ON_ONCE(1);
1012 }
1013}
a101fa10 1014
ccefc7ab
MD		 1015static
1016int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event)
1017{
1018 switch (event->type) {
1019 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1020 return 0;
1021 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1022 {
1023 struct lttng_kernel_event_notifier *event_notifier =
1024 container_of(event, struct lttng_kernel_event_notifier, parent);
1025 struct lttng_counter *error_counter;
1026 struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group;
1027 size_t dimension_index[1];
1028 int ret;
1029
1030 /*
1031 * Clear the error counter bucket. The sessiond keeps track of which
1032 * bucket is currently in use. We trust it. The session lock
1033 * synchronizes against concurrent creation of the error
1034 * counter.
1035 */
1036 error_counter = event_notifier_group->error_counter;
1037 if (!error_counter)
1038 return 0;
1039 /*
1040 * Check that the index is within the boundary of the counter.
1041 */
1042 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
1043 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1044 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
1045 return -EINVAL;
1046 }
1047
1048 dimension_index[0] = event_notifier->priv->error_counter_index;
1049 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
1050 if (ret) {
1051 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1052 event_notifier->priv->error_counter_index);
1053 return -EINVAL;
1054 }
1055 return 0;
1056 }
1057 default:
1058 return -EINVAL;
1059 }
1060}
1061
e5382b6d
MD		 1062/*
1063 * Supports event creation while tracing session is active.
3c997079 1064 * Needs to be called with sessions mutex held.
e5382b6d 1065 */
13a2dfca 1066struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
def1e304 1067 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 1068{
13a2dfca
MD		 1069 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
1070 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
1071 struct lttng_kernel_abi_event *event_param = &event_enabler->event_param;
def1e304 1072 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
19bef247 1073 struct lttng_kernel_event_common_private *event_priv;
756a020c 1074 struct lttng_kernel_event_common *event;
3c997079
MD		 1075 const char *event_name;
1076 struct hlist_head *head;
3d084699 1077 int ret;
4e3c1b9b 1078
13a2dfca 1079 if (!lttng_kernel_event_id_available(event_enabler)) {
4cf0bf51 1080 ret = -EMFILE;
e5382b6d 1081 goto full;
abc0446a 1082 }
3c997079
MD		 1083
1084 switch (itype) {
606828e4 1085 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1086 event_name = event_desc->event_name;
3c997079 1087 break;
b4a75708 1088
c190d76e
MJ		 1089 case LTTNG_KERNEL_ABI_KPROBE:
1090 lttng_fallthrough;
1091 case LTTNG_KERNEL_ABI_UPROBE:
1092 lttng_fallthrough;
1093 case LTTNG_KERNEL_ABI_KRETPROBE:
1094 lttng_fallthrough;
606828e4 1095 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 1096 event_name = event_param->name;
1097 break;
b4a75708 1098
c190d76e
MJ		 1099 case LTTNG_KERNEL_ABI_FUNCTION:
1100 lttng_fallthrough;
1101 case LTTNG_KERNEL_ABI_NOOP:
1102 lttng_fallthrough;
3c997079
MD		 1103 default:
1104 WARN_ON_ONCE(1);
1105 ret = -EINVAL;
1106 goto type_error;
1107 }
4a11ef1c 1108
0def9170 1109 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name);
19bef247 1110 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
13a2dfca 1111 if (lttng_event_enabler_event_name_match_event(event_enabler, event_name, event_priv->pub)) {
3c997079
MD		 1112 ret = -EEXIST;
1113 goto exist;
abc0446a
MD		 1114 }
1115 }
3c997079 1116
13a2dfca 1117 event = lttng_kernel_event_alloc(event_enabler);
756a020c 1118 if (!event) {
4cf0bf51 1119 ret = -ENOMEM;
756a020c 1120 goto alloc_error;
abc0446a 1121 }
3c997079
MD		 1122
1123 switch (itype) {
606828e4 1124 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 1125 /* Event will be enabled by enabler sync. */
7cd0f696
MD		 1126 event->enabled = 0;
1127 event->priv->registered = 0;
1128 event->priv->desc = lttng_event_desc_get(event_name);
1129 if (!event->priv->desc) {
4cf0bf51 1130 ret = -ENOENT;
d3dbe23c 1131 goto register_error;
abc0446a 1132 }
3c997079
MD		 1133 /* Populate lttng_event structure before event registration. */
1134 smp_wmb();
baf20995 1135 break;
b4a75708 1136
606828e4 1137 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 1138 /*
1139 * Needs to be explicitly enabled after creation, since
1140 * we may want to apply filters.
1141 */
7cd0f696
MD		 1142 event->enabled = 0;
1143 event->priv->registered = 1;
3c997079
MD		 1144 /*
1145 * Populate lttng_event structure before event
1146 * registration.
1147 */
1148 smp_wmb();
8bf17deb 1149 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 1150 event_param->u.kprobe.symbol_name,
1151 event_param->u.kprobe.offset,
1152 event_param->u.kprobe.addr,
7cd0f696 1153 event);
abc0446a 1154 if (ret) {
4cf0bf51 1155 ret = -EINVAL;
d6d808f3 1156 goto register_error;
abc0446a 1157 }
7cd0f696 1158 ret = try_module_get(event->priv->desc->owner);
edeb3137 1159 WARN_ON_ONCE(!ret);
d6d808f3 1160 break;
b4a75708 1161
606828e4 1162 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 1163 {
756a020c 1164 struct lttng_kernel_event_common *event_return;
7371f44c
MD		 1165
1166 /* kretprobe defines 2 events */
a0493bef
MD		 1167 /*
1168 * Needs to be explicitly enabled after creation, since
1169 * we may want to apply filters.
1170 */
756a020c
MD		 1171 event->enabled = 0;
1172 event->priv->registered = 1;
a67ba386 1173
13a2dfca 1174 event_return = lttng_kernel_event_alloc(event_enabler);
756a020c 1175 if (!event) {
a67ba386 1176 ret = -ENOMEM;
756a020c 1177 goto alloc_error;
a67ba386 1178 }
756a020c
MD		 1179
1180 event_return->enabled = 0;
1181 event_return->priv->registered = 1;
1182
7371f44c 1183 /*
a90917c3 1184 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1185 */
1186 smp_wmb();
3c997079 1187 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1188 event_param->u.kretprobe.symbol_name,
1189 event_param->u.kretprobe.offset,
1190 event_param->u.kretprobe.addr,
756a020c 1191 event, event_return);
7371f44c 1192 if (ret) {
756a020c 1193 lttng_kernel_event_free(event_return);
4cf0bf51 1194 ret = -EINVAL;
7371f44c
MD		 1195 goto register_error;
1196 }
1197 /* Take 2 refs on the module: one per event. */
756a020c 1198 ret = try_module_get(event->priv->desc->owner);
7371f44c 1199 WARN_ON_ONCE(!ret);
756a020c 1200 ret = try_module_get(event_return->priv->desc->owner);
7371f44c 1201 WARN_ON_ONCE(!ret);
ee7e9a18 1202 ret = _lttng_event_recorder_metadata_statedump(event_return);
abc0446a 1203 WARN_ON_ONCE(ret > 0);
7371f44c 1204 if (ret) {
756a020c 1205 lttng_kernel_event_free(event_return);
7cd0f696
MD		 1206 module_put(event_return->priv->desc->owner);
1207 module_put(event->priv->desc->owner);
7371f44c
MD		 1208 goto statedump_error;
1209 }
19b98250 1210 list_add(&event_return->priv->node, event_list_head);
7371f44c
MD		 1211 break;
1212 }
b4a75708 1213
606828e4 1214 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1215 /*
1216 * Needs to be explicitly enabled after creation, since
1217 * we may want to apply filters.
1218 */
7cd0f696
MD		 1219 event->enabled = 0;
1220 event->priv->registered = 0;
1221 event->priv->desc = event_desc;
badfe9f5 1222 switch (event_param->u.syscall.entryexit) {
606828e4 1223 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1224 ret = -EINVAL;
1225 goto register_error;
606828e4 1226 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
7cd0f696 1227 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1228 break;
606828e4 1229 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
7cd0f696 1230 event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1231 break;
1232 }
1233 switch (event_param->u.syscall.abi) {
606828e4 1234 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1235 ret = -EINVAL;
1236 goto register_error;
606828e4 1237 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
7cd0f696 1238 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1239 break;
606828e4 1240 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
7cd0f696 1241 event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1242 break;
1243 }
7cd0f696 1244 if (!event->priv->desc) {
4cf0bf51 1245 ret = -EINVAL;
259b6cb3 1246 goto register_error;
abc0446a 1247 }
1ec65de1 1248 break;
b4a75708 1249
606828e4 1250 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1251 /*
1252 * Needs to be explicitly enabled after creation, since
1253 * we may want to apply filters.
1254 */
7cd0f696
MD		 1255 event->enabled = 0;
1256 event->priv->registered = 1;
3aed4dca 1257
a344f64b
FD		 1258 /*
1259 * Populate lttng_event structure before event
1260 * registration.
1261 */
1262 smp_wmb();
149b9a9d 1263
83b802dc 1264 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1265 event_param->u.uprobe.fd,
7cd0f696 1266 event);
149b9a9d
YB		 1267 if (ret)
1268 goto register_error;
7cd0f696 1269 ret = try_module_get(event->priv->desc->owner);
149b9a9d
YB		 1270 WARN_ON_ONCE(!ret);
1271 break;
b4a75708 1272
baf20995
MD		 1273 default:
1274 WARN_ON_ONCE(1);
4cf0bf51 1275 ret = -EINVAL;
df07930b 1276 goto register_error;
baf20995 1277 }
13a2dfca 1278
ee7e9a18 1279 ret = _lttng_event_recorder_metadata_statedump(event);
abc0446a
MD		 1280 WARN_ON_ONCE(ret > 0);
1281 if (ret) {
c099397a 1282 goto statedump_error;
abc0446a 1283 }
dffef45d 1284
ccefc7ab
MD		 1285 ret = lttng_kernel_event_notifier_clear_error_counter(event);
1286 if (ret)
1287 goto register_error;
c4e31059 1288
c4e31059 1289 hlist_add_head(&event->priv->hlist_node, head);
13a2dfca 1290 list_add(&event->priv->node, event_list_head);
c4e31059 1291
13a2dfca 1292 return event;
dffef45d 1293
13a2dfca
MD		 1294statedump_error:
1295 /* If a statedump error occurs, events will not be readable. */
dffef45d 1296register_error:
756a020c
MD		 1297 lttng_kernel_event_free(event);
1298alloc_error:
dffef45d
FD		 1299exist:
1300type_error:
13a2dfca 1301full:
dffef45d
FD		 1302 return ERR_PTR(ret);
1303}
1304
83006ee0
MD		 1305struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler,
1306 const struct lttng_kernel_event_desc *event_desc)
1307{
1308 struct lttng_kernel_event_common *event;
1309
1310 mutex_lock(&sessions_mutex);
1311 event = _lttng_kernel_event_create(event_enabler, event_desc);
1312 mutex_unlock(&sessions_mutex);
1313 return event;
1314}
1315
99f52fcc
FD		 1316int lttng_kernel_counter_read(struct lttng_counter *counter,
1317 const size_t *dim_indexes, int32_t cpu,
1318 int64_t *val, bool *overflow, bool *underflow)
1319{
1320 return counter->ops->counter_read(counter->counter, dim_indexes,
1321 cpu, val, overflow, underflow);
1322}
1323
1324int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1325 const size_t *dim_indexes, int64_t *val,
1326 bool *overflow, bool *underflow)
1327{
1328 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1329 val, overflow, underflow);
1330}
1331
1332int lttng_kernel_counter_clear(struct lttng_counter *counter,
1333 const size_t *dim_indexes)
1334{
1335 return counter->ops->counter_clear(counter->counter, dim_indexes);
1336}
1337
6a338ba4 1338/* Only used for tracepoints and system calls for now. */
3c997079 1339static
0c851fa0 1340void register_event(struct lttng_kernel_event_common *event)
3c997079 1341{
437d5aa5 1342 const struct lttng_kernel_event_desc *desc;
f127e61e 1343 int ret = -EINVAL;
3c997079 1344
6a338ba4 1345 WARN_ON_ONCE(event->priv->registered);
4ecb5ad5 1346
0c851fa0
MD		 1347 desc = event->priv->desc;
1348 switch (event->priv->instrumentation) {
606828e4 1349 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1350 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1351 desc->tp_class->probe_callback,
0c851fa0 1352 event);
4ecb5ad5 1353 break;
b4a75708 1354
606828e4 1355 case LTTNG_KERNEL_ABI_SYSCALL:
0c851fa0 1356 ret = lttng_syscall_filter_enable_event(event);
4ecb5ad5 1357 break;
b4a75708 1358
c190d76e
MJ		 1359 case LTTNG_KERNEL_ABI_KPROBE:
1360 lttng_fallthrough;
1361 case LTTNG_KERNEL_ABI_UPROBE:
4ecb5ad5 1362 ret = 0;
f0bcc14c 1363 break;
0c851fa0
MD		 1364
1365 case LTTNG_KERNEL_ABI_KRETPROBE:
1366 switch (event->type) {
1367 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1368 ret = 0;
1369 break;
1370 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1371 WARN_ON_ONCE(1);
1372 break;
1373 }
4ecb5ad5 1374 break;
b4a75708 1375
c190d76e
MJ		 1376 case LTTNG_KERNEL_ABI_FUNCTION:
1377 lttng_fallthrough;
1378 case LTTNG_KERNEL_ABI_NOOP:
1379 lttng_fallthrough;
4ecb5ad5
MD		 1380 default:
1381 WARN_ON_ONCE(1);
1382 }
6a338ba4 1383 WARN_ON_ONCE(ret);
3c997079 1384 if (!ret)
0c851fa0 1385 event->priv->registered = 1;
3c997079
MD		 1386}
1387
6a338ba4
MD		 1388static
1389void unregister_event(struct lttng_kernel_event_common *event)
4e3c1b9b 1390{
f0bcc14c 1391 struct lttng_kernel_event_common_private *event_priv = event->priv;
437d5aa5 1392 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1393 int ret = -EINVAL;
1394
6a338ba4 1395 WARN_ON_ONCE(!event->priv->registered);
3c997079 1396
a67ba386
MD		 1397 desc = event_priv->desc;
1398 switch (event_priv->instrumentation) {
606828e4 1399 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1400 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1401 event_priv->desc->tp_class->probe_callback,
f0bcc14c 1402 event);
baf20995 1403 break;
b4a75708 1404
606828e4 1405 case LTTNG_KERNEL_ABI_KPROBE:
f0bcc14c 1406 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1407 ret = 0;
1408 break;
b4a75708 1409
606828e4 1410 case LTTNG_KERNEL_ABI_KRETPROBE:
f0bcc14c
MD		 1411 switch (event->type) {
1412 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1413 lttng_kretprobes_unregister(event);
1414 ret = 0;
1415 break;
1416 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1417 WARN_ON_ONCE(1);
1418 break;
1419 }
7371f44c 1420 break;
b4a75708 1421
606828e4 1422 case LTTNG_KERNEL_ABI_SYSCALL:
f0bcc14c 1423 ret = lttng_syscall_filter_disable_event(event);
4ecb5ad5 1424 break;
b4a75708 1425
606828e4 1426 case LTTNG_KERNEL_ABI_NOOP:
f0bcc14c
MD		 1427 switch (event->type) {
1428 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1429 ret = 0;
1430 break;
1431 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1432 WARN_ON_ONCE(1);
1433 break;
1434 }
259b6cb3 1435 break;
b4a75708 1436
606828e4 1437 case LTTNG_KERNEL_ABI_UPROBE:
f0bcc14c 1438 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1439 ret = 0;
1440 break;
b4a75708 1441
c190d76e
MJ		 1442 case LTTNG_KERNEL_ABI_FUNCTION:
1443 lttng_fallthrough;
baf20995
MD		 1444 default:
1445 WARN_ON_ONCE(1);
1446 }
6a338ba4 1447 WARN_ON_ONCE(ret);
3c997079 1448 if (!ret)
a67ba386 1449 event_priv->registered = 0;
6a338ba4
MD		 1450}
1451
1452static
1453void _lttng_event_unregister(struct lttng_kernel_event_common *event)
1454{
1455 if (event->priv->registered)
1456 unregister_event(event);
dda6a249
MD		 1457}
1458
1459/*
1460 * Only used internally at session destruction.
1461 */
be066e6c 1462static
0648898e 1463void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1464{
0648898e 1465 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1466 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1467
0648898e
MD		 1468 lttng_free_event_filter_runtime(event);
1469 /* Free event enabler refs */
1470 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1471 &event_priv->enablers_ref_head, node)
1472 kfree(enabler_ref);
b4a75708 1473
0648898e
MD		 1474 switch (event->type) {
1475 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1476 {
1477 struct lttng_kernel_event_recorder *event_recorder =
1478 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1479
0648898e
MD		 1480 switch (event_priv->instrumentation) {
1481 case LTTNG_KERNEL_ABI_TRACEPOINT:
1482 lttng_event_desc_put(event_priv->desc);
1483 break;
b4a75708 1484
0648898e
MD		 1485 case LTTNG_KERNEL_ABI_KPROBE:
1486 module_put(event_priv->desc->owner);
6a35e5bd 1487 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1488 break;
b4a75708 1489
0648898e
MD		 1490 case LTTNG_KERNEL_ABI_KRETPROBE:
1491 module_put(event_priv->desc->owner);
eb6b47db 1492 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1493 break;
b4a75708 1494
0648898e
MD		 1495 case LTTNG_KERNEL_ABI_SYSCALL:
1496 break;
4e3c1b9b 1497
0648898e
MD		 1498 case LTTNG_KERNEL_ABI_UPROBE:
1499 module_put(event_priv->desc->owner);
17806c46 1500 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1501 break;
3ef5cc03 1502
c190d76e
MJ		 1503 case LTTNG_KERNEL_ABI_FUNCTION:
1504 lttng_fallthrough;
1505 case LTTNG_KERNEL_ABI_NOOP:
1506 lttng_fallthrough;
0648898e
MD		 1507 default:
1508 WARN_ON_ONCE(1);
1509 }
f237aef8 1510 list_del(&event_recorder->priv->parent.node);
0648898e
MD		 1511 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1512 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1513 break;
0648898e
MD		 1514 }
1515 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1516 {
1517 struct lttng_kernel_event_notifier *event_notifier =
1518 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1519
0648898e
MD		 1520 switch (event_notifier->priv->parent.instrumentation) {
1521 case LTTNG_KERNEL_ABI_TRACEPOINT:
1522 lttng_event_desc_put(event_notifier->priv->parent.desc);
1523 break;
b4a75708 1524
0648898e
MD		 1525 case LTTNG_KERNEL_ABI_KPROBE:
1526 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1527 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1528 break;
b4a75708 1529
0648898e
MD		 1530 case LTTNG_KERNEL_ABI_SYSCALL:
1531 break;
b4a75708 1532
0648898e
MD		 1533 case LTTNG_KERNEL_ABI_UPROBE:
1534 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1535 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1536 break;
1537
c190d76e
MJ		 1538 case LTTNG_KERNEL_ABI_KRETPROBE:
1539 lttng_fallthrough;
1540 case LTTNG_KERNEL_ABI_FUNCTION:
1541 lttng_fallthrough;
1542 case LTTNG_KERNEL_ABI_NOOP:
1543 lttng_fallthrough;
0648898e
MD		 1544 default:
1545 WARN_ON_ONCE(1);
1546 }
f237aef8 1547 list_del(&event_notifier->priv->parent.node);
0648898e
MD		 1548 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1549 kmem_cache_free(event_notifier_cache, event_notifier);
1550 break;
1551 }
dffef45d
FD		 1552 default:
1553 WARN_ON_ONCE(1);
1554 }
dffef45d
FD		 1555}
1556
8c0393c3 1557struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1558 enum tracker_type tracker_type)
e0130fab 1559{
d1f652f8
MD		 1560 switch (tracker_type) {
1561 case TRACKER_PID:
1562 return &session->pid_tracker;
1563 case TRACKER_VPID:
1564 return &session->vpid_tracker;
1565 case TRACKER_UID:
1566 return &session->uid_tracker;
1567 case TRACKER_VUID:
1568 return &session->vuid_tracker;
1569 case TRACKER_GID:
1570 return &session->gid_tracker;
1571 case TRACKER_VGID:
1572 return &session->vgid_tracker;
1573 default:
1574 WARN_ON_ONCE(1);
1575 return NULL;
1576 }
1577}
1578
8cdc1a81 1579int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1580 enum tracker_type tracker_type, int id)
1581{
8c0393c3 1582 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1583 int ret;
1584
d1f652f8
MD		 1585 tracker = get_tracker(session, tracker_type);
1586 if (!tracker)
1587 return -EINVAL;
1588 if (id < -1)
e0130fab
MD		 1589 return -EINVAL;
1590 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1591 if (id == -1) {
1592 /* track all ids: destroy tracker. */
1593 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1594 ret = 0;
1595 } else {
d1f652f8 1596 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1597 }
e0130fab
MD		 1598 mutex_unlock(&sessions_mutex);
1599 return ret;
1600}
1601
8cdc1a81 1602int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1603 enum tracker_type tracker_type, int id)
e0130fab 1604{
8c0393c3 1605 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1606 int ret;
1607
d1f652f8
MD		 1608 tracker = get_tracker(session, tracker_type);
1609 if (!tracker)
1610 return -EINVAL;
1611 if (id < -1)
e0130fab
MD		 1612 return -EINVAL;
1613 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1614 if (id == -1) {
1615 /* untrack all ids: replace by empty tracker. */
1616 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1617 } else {
d1f652f8 1618 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1619 }
e0130fab
MD		 1620 mutex_unlock(&sessions_mutex);
1621 return ret;
1622}
1623
7e6f9ef6 1624static
d1f652f8 1625void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1626{
8c0393c3
MD		 1627 struct lttng_kernel_id_tracker *id_tracker = m->private;
1628 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1629 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1630 int iter = 0, i;
1631
1632 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1633 if (id_tracker_p) {
1634 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1635 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1636
f934e302 1637 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1638 if (iter++ >= *pos)
1639 return e;
1640 }
1641 }
1642 } else {
d1f652f8 1643 /* ID tracker disabled. */
7e6f9ef6 1644 if (iter >= *pos && iter == 0) {
d1f652f8 1645 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1646 }
1647 iter++;
1648 }
1649 /* End of list */
1650 return NULL;
1651}
1652
1653/* Called with sessions_mutex held. */
1654static
d1f652f8 1655void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1656{
8c0393c3
MD		 1657 struct lttng_kernel_id_tracker *id_tracker = m->private;
1658 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1659 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1660 int iter = 0, i;
1661
1662 (*ppos)++;
d1f652f8
MD		 1663 if (id_tracker_p) {
1664 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1665 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1666
f934e302 1667 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1668 if (iter++ >= *ppos)
1669 return e;
1670 }
1671 }
1672 } else {
d1f652f8 1673 /* ID tracker disabled. */
7e6f9ef6 1674 if (iter >= *ppos && iter == 0)
d1f652f8 1675 return p; /* empty tracker */
7e6f9ef6
MD		 1676 iter++;
1677 }
1678
1679 /* End of list */
1680 return NULL;
1681}
1682
1683static
d1f652f8 1684void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1685{
1686 mutex_unlock(&sessions_mutex);
1687}
1688
1689static
d1f652f8 1690int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1691{
8c0393c3
MD		 1692 struct lttng_kernel_id_tracker *id_tracker = m->private;
1693 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1694 int id;
7e6f9ef6 1695
d1f652f8 1696 if (p == id_tracker_p) {
7e6f9ef6 1697 /* Tracker disabled. */
d1f652f8 1698 id = -1;
7e6f9ef6 1699 } else {
d1f652f8 1700 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1701
d1f652f8
MD		 1702 id = lttng_id_tracker_get_node_id(e);
1703 }
8c0393c3 1704 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1705 case TRACKER_PID:
1706 seq_printf(m, "process { pid = %d; };\n", id);
1707 break;
1708 case TRACKER_VPID:
1709 seq_printf(m, "process { vpid = %d; };\n", id);
1710 break;
1711 case TRACKER_UID:
1712 seq_printf(m, "user { uid = %d; };\n", id);
1713 break;
1714 case TRACKER_VUID:
1715 seq_printf(m, "user { vuid = %d; };\n", id);
1716 break;
1717 case TRACKER_GID:
1718 seq_printf(m, "group { gid = %d; };\n", id);
1719 break;
1720 case TRACKER_VGID:
1721 seq_printf(m, "group { vgid = %d; };\n", id);
1722 break;
1723 default:
1724 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1725 }
7e6f9ef6
MD		 1726 return 0;
1727}
1728
1729static
d1f652f8
MD		 1730const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1731 .start = id_list_start,
1732 .next = id_list_next,
1733 .stop = id_list_stop,
1734 .show = id_list_show,
7e6f9ef6
MD		 1735};
1736
1737static
d1f652f8 1738int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1739{
d1f652f8 1740 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1741}
1742
1743static
d1f652f8 1744int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1745{
1746 struct seq_file *m = file->private_data;
8c0393c3 1747 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1748 int ret;
1749
d1f652f8 1750 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1751 ret = seq_release(inode, file);
d1f652f8 1752 if (!ret)
8c0393c3 1753 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1754 return ret;
1755}
1756
d1f652f8 1757const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1758 .owner = THIS_MODULE,
d1f652f8 1759 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1760 .read = seq_read,
1761 .llseek = seq_lseek,
d1f652f8 1762 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1763};
1764
8cdc1a81 1765int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1766 enum tracker_type tracker_type)
7e6f9ef6 1767{
d1f652f8 1768 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1769 struct seq_file *m;
1770 int file_fd, ret;
1771
1772 file_fd = lttng_get_unused_fd();
1773 if (file_fd < 0) {
1774 ret = file_fd;
1775 goto fd_error;
1776 }
1777
d1f652f8
MD		 1778 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1779 &lttng_tracker_ids_list_fops,
7e6f9ef6 1780 NULL, O_RDWR);
d1f652f8
MD		 1781 if (IS_ERR(tracker_ids_list_file)) {
1782 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1783 goto file_error;
1784 }
8cdc1a81 1785 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1786 ret = -EOVERFLOW;
9c1f4643
MD		 1787 goto refcount_error;
1788 }
d1f652f8 1789 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1790 if (ret < 0)
1791 goto open_error;
d1f652f8
MD		 1792 m = tracker_ids_list_file->private_data;
1793
1794 m->private = get_tracker(session, tracker_type);
1795 BUG_ON(!m->private);
1796 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1797
1798 return file_fd;
1799
1800open_error:
8cdc1a81 1801 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1802refcount_error:
d1f652f8 1803 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1804file_error:
1805 put_unused_fd(file_fd);
1806fd_error:
1807 return ret;
1808}
1809
3c997079
MD		 1810/*
1811 * Enabler management.
1812 */
1813static
4993071a
PP		 1814int lttng_match_enabler_star_glob(const char *desc_name,
1815 const char *pattern)
3c997079 1816{
cbc19040
MD		 1817 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1818 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1819 return 0;
1820 return 1;
1821}
1822
1823static
4ecb5ad5
MD		 1824int lttng_match_enabler_name(const char *desc_name,
1825 const char *name)
3c997079 1826{
4ecb5ad5 1827 if (strcmp(desc_name, name))
3c997079
MD		 1828 return 0;
1829 return 1;
1830}
1831
8bff0fc3
MD		 1832static
1833int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc,
8d554755 1834 struct lttng_event_enabler_common *enabler)
3c997079 1835{
4ecb5ad5 1836 const char *desc_name, *enabler_name;
badfe9f5 1837 bool compat = false, entry = false;
4ecb5ad5
MD		 1838
1839 enabler_name = enabler->event_param.name;
1840 switch (enabler->event_param.instrumentation) {
606828e4 1841 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1842 desc_name = desc->event_name;
3b861b22
FD		 1843 switch (enabler->format_type) {
1844 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1845 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1846 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1847 return lttng_match_enabler_name(desc_name, enabler_name);
1848 default:
1849 return -EINVAL;
1850 }
4ecb5ad5 1851 break;
b4a75708 1852
606828e4 1853 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1854 desc_name = desc->event_name;
badfe9f5 1855 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1856 desc_name += strlen("compat_");
badfe9f5
MD		 1857 compat = true;
1858 }
4ecb5ad5
MD		 1859 if (!strncmp(desc_name, "syscall_exit_",
1860 strlen("syscall_exit_"))) {
1861 desc_name += strlen("syscall_exit_");
1862 } else if (!strncmp(desc_name, "syscall_entry_",
1863 strlen("syscall_entry_"))) {
1864 desc_name += strlen("syscall_entry_");
badfe9f5 1865 entry = true;
4ecb5ad5
MD		 1866 } else {
1867 WARN_ON_ONCE(1);
1868 return -EINVAL;
1869 }
badfe9f5 1870 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1871 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1872 break;
606828e4 1873 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1874 if (!entry)
1875 return 0;
1876 break;
606828e4 1877 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1878 if (entry)
1879 return 0;
1880 break;
1881 default:
1882 return -EINVAL;
1883 }
1884 switch (enabler->event_param.u.syscall.abi) {
606828e4 1885 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1886 break;
606828e4 1887 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1888 if (compat)
1889 return 0;
1890 break;
606828e4 1891 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 1892 if (!compat)
1893 return 0;
1894 break;
1895 default:
1896 return -EINVAL;
1897 }
1898 switch (enabler->event_param.u.syscall.match) {
606828e4 1899 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 1900 switch (enabler->format_type) {
1901 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1902 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1903 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1904 return lttng_match_enabler_name(desc_name, enabler_name);
1905 default:
1906 return -EINVAL;
1907 }
1908 break;
606828e4 1909 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 1910 return -EINVAL; /* Not implemented. */
1911 default:
1912 return -EINVAL;
1913 }
4ecb5ad5 1914 break;
b4a75708 1915
4ecb5ad5
MD		 1916 default:
1917 WARN_ON_ONCE(1);
1918 return -EINVAL;
1919 }
3c997079
MD		 1920}
1921
8bff0fc3
MD		 1922bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
1923 struct lttng_event_enabler_common *enabler)
1924{
1925 int ret;
1926
1927 ret = lttng_desc_match_enabler_check(desc, enabler);
1928 if (ret < 0) {
1929 WARN_ON_ONCE(1);
1930 return false;
1931 }
1932 return ret;
1933}
1934
5c6ec66a
MD		 1935bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler,
1936 struct lttng_kernel_event_common *event)
3c997079 1937{
5c6ec66a
MD		 1938 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
1939 return false;
b2bc0bc8 1940
5c6ec66a
MD		 1941 switch (event_enabler->enabler_type) {
1942 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1943 {
1944 struct lttng_event_recorder_enabler *event_recorder_enabler =
1945 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1946 struct lttng_kernel_event_recorder *event_recorder =
1947 container_of(event, struct lttng_kernel_event_recorder, parent);
1948
1949 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
1950 && event_recorder->chan == event_recorder_enabler->chan)
1951 return true;
1952 else
1953 return false;
1954 }
1955 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1956 {
1957 struct lttng_event_notifier_enabler *event_notifier_enabler =
1958 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1959 struct lttng_kernel_event_notifier *event_notifier =
1960 container_of(event, struct lttng_kernel_event_notifier, parent);
1961
1962 if (lttng_desc_match_enabler(event->priv->desc, event_enabler)
1963 && event_notifier->priv->group == event_notifier_enabler->group
1964 && event->priv->user_token == event_enabler->user_token)
1965 return true;
1966 else
1967 return false;
1968 }
1969 default:
1970 WARN_ON_ONCE(1);
1971 return false;
1972 }
3c997079
MD		 1973}
1974
5c6ec66a
MD		 1975bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
1976 const struct lttng_kernel_event_desc *desc,
1977 struct lttng_kernel_event_common *event)
b01155ba 1978{
5c6ec66a
MD		 1979 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
1980 return false;
b01155ba 1981
5c6ec66a
MD		 1982 switch (event_enabler->enabler_type) {
1983 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
1984 {
1985 struct lttng_event_recorder_enabler *event_recorder_enabler =
1986 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
1987 struct lttng_kernel_event_recorder *event_recorder =
1988 container_of(event, struct lttng_kernel_event_recorder, parent);
1989
1990 if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
1991 return true;
1992 else
1993 return false;
1994 }
1995 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
1996 {
1997 struct lttng_event_notifier_enabler *event_notifier_enabler =
1998 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
1999 struct lttng_kernel_event_notifier *event_notifier =
2000 container_of(event, struct lttng_kernel_event_notifier, parent);
2001
2002 if (event->priv->desc == desc
2003 && event_notifier->priv->group == event_notifier_enabler->group
2004 && event->priv->user_token == event_enabler->user_token)
2005 return true;
2006 else
2007 return false;
2008 }
2009 default:
2010 WARN_ON_ONCE(1);
2011 return false;
2012 }
b01155ba
FD		 2013}
2014
0d223dc6
MD		 2015bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler,
2016 const char *event_name,
2017 struct lttng_kernel_event_common *event)
2018{
2019 if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
2020 return false;
2021
2022 switch (event_enabler->enabler_type) {
2023 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2024 {
2025 struct lttng_event_recorder_enabler *event_recorder_enabler =
2026 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2027 struct lttng_kernel_event_recorder *event_recorder =
2028 container_of(event, struct lttng_kernel_event_recorder, parent);
2029
2030 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2031 && event_recorder->chan == event_recorder_enabler->chan)
2032 return true;
2033 else
2034 return false;
2035 }
2036 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2037 {
2038 struct lttng_event_notifier_enabler *event_notifier_enabler =
2039 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2040 struct lttng_kernel_event_notifier *event_notifier =
2041 container_of(event, struct lttng_kernel_event_notifier, parent);
2042
2043 if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
2044 && event_notifier->priv->group == event_notifier_enabler->group
2045 && event->priv->user_token == event_enabler->user_token)
2046 return true;
2047 else
2048 return false;
2049 }
2050 default:
2051 WARN_ON_ONCE(1);
2052 return false;
2053 }
2054}
2055
3c997079 2056static
b2bc0bc8
FD		 2057struct lttng_enabler_ref *lttng_enabler_ref(
2058 struct list_head *enablers_ref_list,
8d554755 2059 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2060{
2061 struct lttng_enabler_ref *enabler_ref;
2062
b2bc0bc8 2063 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2064 if (enabler_ref->ref == enabler)
2065 return enabler_ref;
2066 }
2067 return NULL;
2068}
2069
3c997079 2070static
b2f63bde 2071void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler)
3c997079 2072{
c8e14380 2073 struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
437d5aa5
MD		 2074 struct lttng_kernel_probe_desc *probe_desc;
2075 const struct lttng_kernel_event_desc *desc;
3c997079 2076 struct list_head *probe_list;
c8e14380 2077 int i;
3c997079
MD		 2078
2079 probe_list = lttng_get_probe_list_head();
2080 /*
2081 * For each probe event, if we find that a probe event matches
2082 * our enabler, create an associated lttng_event if not
2083 * already present.
2084 */
2085 list_for_each_entry(probe_desc, probe_list, head) {
2086 for (i = 0; i < probe_desc->nr_events; i++) {
58969906 2087 bool found = false;
3c997079 2088 struct hlist_head *head;
83006ee0 2089 struct lttng_kernel_event_common *event;
19bef247 2090 struct lttng_kernel_event_common_private *event_priv;
3c997079
MD		 2091
2092 desc = probe_desc->event_desc[i];
c8e14380 2093 if (!lttng_desc_match_enabler(desc, event_enabler))
3c997079 2094 continue;
3c997079
MD		 2095
2096 /*
2097 * Check if already created.
2098 */
0def9170 2099 head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
19bef247 2100 lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
58969906
MD		 2101 if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) {
2102 found = true;
2103 break;
2104 }
3c997079
MD		 2105 }
2106 if (found)
2107 continue;
2108
2109 /*
83006ee0 2110 * We need to create an event for this event probe.
3c997079 2111 */
c8e14380 2112 event = _lttng_kernel_event_create(event_enabler, desc);
c3fb484e 2113 if (IS_ERR(event)) {
5a15f70c 2114 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2115 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2116 }
2117 }
2118 }
2119}
2120
33a39a3c 2121/*
8839618b 2122 * Create event if it is missing and present in the list of tracepoint probes.
33a39a3c
MD		 2123 * Should be called with sessions mutex held.
2124 */
2125static
b2f63bde 2126void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c 2127{
b2f63bde
MD		 2128 int ret;
2129
8839618b 2130 switch (event_enabler->event_param.instrumentation) {
606828e4 2131 case LTTNG_KERNEL_ABI_TRACEPOINT:
b2f63bde 2132 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler);
33a39a3c 2133 break;
b4a75708 2134
606828e4 2135 case LTTNG_KERNEL_ABI_SYSCALL:
b2f63bde
MD		 2136 ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler);
2137 WARN_ON_ONCE(ret);
33a39a3c 2138 break;
b4a75708 2139
33a39a3c
MD		 2140 default:
2141 WARN_ON_ONCE(1);
2142 break;
2143 }
2144}
2145
d619fae9
MD		 2146static
2147void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
2148 struct lttng_kernel_event_common *event)
2149{
2150 /* Link filter bytecodes if not linked yet. */
2151 lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx,
2152 &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
2153}
2154
1e06b222
MD		 2155static
2156void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
2157 struct lttng_kernel_event_common *event)
2158{
2159 switch (event_enabler->enabler_type) {
2160 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2161 break;
2162 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2163 {
2164 struct lttng_event_notifier_enabler *event_notifier_enabler =
2165 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2166 struct lttng_kernel_event_notifier *event_notifier =
2167 container_of(event, struct lttng_kernel_event_notifier, parent);
2168
2169 /* Link capture bytecodes if not linked yet. */
2170 lttng_enabler_link_bytecode(event->priv->desc,
2171 lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head,
2172 &event_notifier_enabler->capture_bytecode_head);
2173 event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
2174 break;
2175 }
2176 default:
2177 WARN_ON_ONCE(1);
2178 }
2179}
2180
3c997079 2181/*
b2bc0bc8 2182 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2183 * and add backward reference from the event to the enabler.
2184 * Should be called with sessions mutex held.
2185 */
2186static
3622cd47 2187int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler)
3c997079 2188{
3622cd47
MD		 2189 struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler);
2190 struct lttng_kernel_event_common_private *event_priv;
3c997079 2191
3622cd47 2192 lttng_syscall_table_set_wildcard_all(event_enabler);
badfe9f5 2193
3c997079 2194 /* First ensure that probe events are created for this enabler. */
b2f63bde 2195 lttng_event_enabler_create_events_if_missing(event_enabler);
3c997079 2196
3622cd47
MD		 2197 /* Link the created event with its associated enabler. */
2198 list_for_each_entry(event_priv, event_list_head, node) {
2199 struct lttng_kernel_event_common *event = event_priv->pub;
b01155ba
FD		 2200 struct lttng_enabler_ref *enabler_ref;
2201
3622cd47 2202 if (!lttng_event_enabler_match_event(event_enabler, event))
b01155ba
FD		 2203 continue;
2204
3622cd47 2205 enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler);
b01155ba
FD		 2206 if (!enabler_ref) {
2207 /*
2208 * If no backward ref, create it.
2209 * Add backward ref from event_notifier to enabler.
2210 */
2211 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2212 if (!enabler_ref)
2213 return -ENOMEM;
2214
3622cd47
MD		 2215 enabler_ref->ref = event_enabler;
2216 list_add(&enabler_ref->node, &event_priv->enablers_ref_head);
b01155ba
FD		 2217 }
2218
3622cd47
MD		 2219 lttng_event_enabler_init_event_filter(event_enabler, event);
2220 lttng_event_enabler_init_event_capture(event_enabler, event);
b01155ba
FD		 2221 }
2222 return 0;
2223}
2224
3c997079
MD		 2225/*
2226 * Called at module load: connect the probe on all enablers matching
2227 * this event.
2228 * Called with sessions lock held.
2229 */
2230int lttng_fix_pending_events(void)
2231{
8cdc1a81 2232 struct lttng_kernel_session_private *session_priv;
3c997079 2233
8cdc1a81
MD		 2234 list_for_each_entry(session_priv, &sessions, list)
2235 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2236 return 0;
2237}
2238
b01155ba
FD		 2239static bool lttng_event_notifier_group_has_active_event_notifiers(
2240 struct lttng_event_notifier_group *event_notifier_group)
2241{
09710b83 2242 struct lttng_event_enabler_common *event_enabler;
b01155ba 2243
09710b83
MD		 2244 list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) {
2245 if (event_enabler->enabled)
b01155ba
FD		 2246 return true;
2247 }
2248 return false;
2249}
2250
2251bool lttng_event_notifier_active(void)
2252{
2253 struct lttng_event_notifier_group *event_notifier_group;
2254
2255 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2256 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2257 return true;
2258 }
2259 return false;
2260}
2261
2262int lttng_fix_pending_event_notifiers(void)
2263{
2264 struct lttng_event_notifier_group *event_notifier_group;
2265
2266 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2267 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2268 return 0;
2269}
2270
1ae083ba 2271struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2272 enum lttng_enabler_format_type format_type,
606828e4 2273 struct lttng_kernel_abi_event *event_param,
f7d06400 2274 struct lttng_kernel_channel_buffer *chan)
3c997079 2275{
1ae083ba 2276 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2277
b2bc0bc8
FD		 2278 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2279 if (!event_enabler)
3c997079 2280 return NULL;
0bb716a8 2281 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2282 event_enabler->parent.format_type = format_type;
2283 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2284 memcpy(&event_enabler->parent.event_param, event_param,
2285 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2286 event_enabler->chan = chan;
3c997079 2287 /* ctx left NULL */
5b9817ae 2288 event_enabler->parent.enabled = 0;
def1e304
MD		 2289 return event_enabler;
2290}
2291
2292void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2293 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2294{
3c997079 2295 mutex_lock(&sessions_mutex);
09710b83
MD		 2296 list_add(&event_enabler->parent.node, &session->priv->enablers_head);
2297 event_enabler->parent.published = true;
def1e304 2298 lttng_session_lazy_sync_event_enablers(session);
3c997079 2299 mutex_unlock(&sessions_mutex);
3c997079
MD		 2300}
2301
7b25ab0e 2302int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2303{
2304 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2305 event_enabler->enabled = 1;
2306 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2307 mutex_unlock(&sessions_mutex);
2308 return 0;
2309}
2310
7b25ab0e 2311int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2312{
2313 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2314 event_enabler->enabled = 0;
2315 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2316 mutex_unlock(&sessions_mutex);
2317 return 0;
2318}
2319
b2bc0bc8 2320static
8d554755 2321int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2322 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2323{
d64ca521 2324 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2325 uint32_t bytecode_len;
2326 int ret;
2327
2328 ret = get_user(bytecode_len, &bytecode->len);
2329 if (ret)
2330 return ret;
52cfcdf3 2331 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2332 GFP_KERNEL);
2333 if (!bytecode_node)
2334 return -ENOMEM;
2335 ret = copy_from_user(&bytecode_node->bc, bytecode,
2336 sizeof(*bytecode) + bytecode_len);
2337 if (ret)
2338 goto error_free;
b2bc0bc8 2339
8a445457 2340 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2341 bytecode_node->enabler = enabler;
2342 /* Enforce length based on allocated size */
2343 bytecode_node->bc.len = bytecode_len;
2344 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2345
07dfc1d0
MD		 2346 return 0;
2347
2348error_free:
52cfcdf3 2349 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2350 return ret;
2351}
2352
6048044f 2353int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2354 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2355{
2356 int ret;
6048044f 2357 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2358 if (ret)
2359 goto error;
7b25ab0e 2360 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2361 return 0;
2362
2363error:
2364 return ret;
2365}
2366
e2d5dbc7 2367int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2368 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2369{
2370
e2d5dbc7 2371 switch (event->priv->instrumentation) {
606828e4 2372 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2373 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2374 default:
2375 return -EINVAL;
2376 }
2377}
2378
3c997079 2379static
8d554755 2380void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2381{
d64ca521 2382 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2383
2384 /* Destroy filter bytecode */
2385 list_for_each_entry_safe(filter_node, tmp_filter_node,
2386 &enabler->filter_bytecode_head, node) {
52cfcdf3 2387 lttng_kvfree(filter_node);
07dfc1d0 2388 }
b2bc0bc8
FD		 2389}
2390
44b1abdc 2391void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2392{
09710b83
MD		 2393 lttng_enabler_destroy(event_enabler);
2394 if (event_enabler->published)
2395 list_del(&event_enabler->node);
2396
44b1abdc
MD		 2397 switch (event_enabler->enabler_type) {
2398 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2399 {
2400 struct lttng_event_recorder_enabler *event_recorder_enabler =
2401 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2402
44b1abdc
MD		 2403 kfree(event_recorder_enabler);
2404 break;
2405 }
2406 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2407 {
2408 struct lttng_event_notifier_enabler *event_notifier_enabler =
2409 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2410
44b1abdc
MD		 2411 kfree(event_notifier_enabler);
2412 break;
2413 }
2414 default:
2415 WARN_ON_ONCE(1);
2416 }
3c997079
MD		 2417}
2418
dffef45d 2419struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
dffef45d 2420 enum lttng_enabler_format_type format_type,
1bbb5b2d
MD		 2421 struct lttng_kernel_abi_event_notifier *event_notifier_param,
2422 struct lttng_event_notifier_group *event_notifier_group)
dffef45d
FD		 2423{
2424 struct lttng_event_notifier_enabler *event_notifier_enabler;
2425
2426 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2427 if (!event_notifier_enabler)
2428 return NULL;
2429
0bb716a8 2430 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2431 event_notifier_enabler->parent.format_type = format_type;
2432 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2433 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2434
99f52fcc 2435 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2436 event_notifier_enabler->num_captures = 0;
dffef45d 2437
5b9817ae
MD		 2438 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2439 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2440
5b9817ae
MD		 2441 event_notifier_enabler->parent.enabled = 0;
2442 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d 2443 event_notifier_enabler->group = event_notifier_group;
1bbb5b2d
MD		 2444 return event_notifier_enabler;
2445}
dffef45d 2446
1bbb5b2d
MD		 2447void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group,
2448 struct lttng_event_notifier_enabler *event_notifier_enabler)
2449{
dffef45d 2450 mutex_lock(&sessions_mutex);
09710b83
MD		 2451 list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head);
2452 event_notifier_enabler->parent.published = true;
b01155ba 2453 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d 2454 mutex_unlock(&sessions_mutex);
dffef45d
FD		 2455}
2456
2457int lttng_event_notifier_enabler_enable(
2458 struct lttng_event_notifier_enabler *event_notifier_enabler)
2459{
2460 mutex_lock(&sessions_mutex);
2461 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2462 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2463 mutex_unlock(&sessions_mutex);
2464 return 0;
2465}
2466
2467int lttng_event_notifier_enabler_disable(
2468 struct lttng_event_notifier_enabler *event_notifier_enabler)
2469{
2470 mutex_lock(&sessions_mutex);
2471 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2472 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2473 mutex_unlock(&sessions_mutex);
2474 return 0;
2475}
2476
99d223ad
FD		 2477int lttng_event_notifier_enabler_attach_capture_bytecode(
2478 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2479 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2480{
d64ca521 2481 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2482 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2483 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2484 uint32_t bytecode_len;
2485 int ret;
2486
2487 ret = get_user(bytecode_len, &bytecode->len);
2488 if (ret)
2489 return ret;
2490
2491 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2492 GFP_KERNEL);
2493 if (!bytecode_node)
2494 return -ENOMEM;
2495
2496 ret = copy_from_user(&bytecode_node->bc, bytecode,
2497 sizeof(*bytecode) + bytecode_len);
2498 if (ret)
2499 goto error_free;
2500
8a445457 2501 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2502 bytecode_node->enabler = enabler;
2503
2504 /* Enforce length based on allocated size */
2505 bytecode_node->bc.len = bytecode_len;
2506 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2507
2508 event_notifier_enabler->num_captures++;
2509
2510 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2511 goto end;
2512
2513error_free:
2514 lttng_kvfree(bytecode_node);
2515end:
2516 return ret;
2517}
2518
cc5719b1
MD		 2519static
2520void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event)
2521{
2522 int has_enablers_without_filter_bytecode = 0, nr_filters = 0;
2523 struct lttng_kernel_bytecode_runtime *runtime;
2524 struct lttng_enabler_ref *enabler_ref;
2525
2526 /* Check if has enablers without bytecode enabled */
2527 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2528 if (enabler_ref->ref->enabled
2529 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2530 has_enablers_without_filter_bytecode = 1;
2531 break;
2532 }
2533 }
2534 event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode;
2535
2536 /* Enable filters */
2537 list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) {
2538 lttng_bytecode_sync_state(runtime);
2539 nr_filters++;
2540 }
2541 WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters));
2542}
2543
2544static
2545void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event)
2546{
2547 switch (event->type) {
2548 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2549 break;
2550 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2551 {
2552 struct lttng_kernel_event_notifier *event_notifier =
2553 container_of(event, struct lttng_kernel_event_notifier, parent);
2554 struct lttng_kernel_bytecode_runtime *runtime;
2555 int nr_captures = 0;
2556
2557 /* Enable captures */
2558 list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) {
2559 lttng_bytecode_sync_state(runtime);
2560 nr_captures++;
2561 }
2562 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
2563 break;
2564 }
2565 default:
2566 WARN_ON_ONCE(1);
2567 }
2568}
2569
a0c6ad2e
MD		 2570static
2571bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event)
2572{
2573 struct lttng_enabler_ref *enabler_ref;
2574 bool enabled = false;
2575
2576 switch (event->priv->instrumentation) {
2577 case LTTNG_KERNEL_ABI_TRACEPOINT:
2578 lttng_fallthrough;
2579 case LTTNG_KERNEL_ABI_SYSCALL:
2580 /* Enable events */
2581 list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) {
2582 if (enabler_ref->ref->enabled) {
2583 enabled = true;
2584 break;
2585 }
2586 }
2587 break;
2588 default:
2589 WARN_ON_ONCE(1);
2590 return false;
2591 }
2592
2593 switch (event->type) {
2594 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
2595 {
2596 struct lttng_kernel_event_recorder *event_recorder =
2597 container_of(event, struct lttng_kernel_event_recorder, parent);
2598
2599 /*
2600 * Enabled state is based on union of enablers, with
2601 * intersection of session and channel transient enable
2602 * states.
2603 */
2604 return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate;
2605 }
2606 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
2607 return enabled;
2608 default:
2609 WARN_ON_ONCE(1);
2610 return false;
2611 }
2612}
2613
2614static
2615bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event)
2616{
2617 switch (event->priv->instrumentation) {
2618 case LTTNG_KERNEL_ABI_TRACEPOINT:
2619 lttng_fallthrough;
2620 case LTTNG_KERNEL_ABI_SYSCALL:
2621 return true;
2622
2623 default:
2624 /* Not handled with lazy sync. */
2625 return false;
2626 }
2627}
2628
3c997079 2629/*
3c997079
MD		 2630 * Should be called with sessions mutex held.
2631 */
2632static
a0c6ad2e
MD		 2633void lttng_sync_event_list(struct list_head *event_enabler_list,
2634 struct list_head *event_list)
3c997079 2635{
a0c6ad2e 2636 struct lttng_kernel_event_common_private *event_priv;
09710b83 2637 struct lttng_event_enabler_common *event_enabler;
3c997079 2638
a0c6ad2e 2639 list_for_each_entry(event_enabler, event_enabler_list, node)
09710b83 2640 lttng_event_enabler_ref_events(event_enabler);
a0c6ad2e 2641
3c997079
MD		 2642 /*
2643 * For each event, if at least one of its enablers is enabled,
2644 * and its channel and session transient states are enabled, we
2645 * enable the event, else we disable it.
2646 */
a0c6ad2e
MD		 2647 list_for_each_entry(event_priv, event_list, node) {
2648 struct lttng_kernel_event_common *event = event_priv->pub;
2649 bool enabled;
b4a75708 2650
a0c6ad2e 2651 if (!lttng_event_is_lazy_sync(event))
3c997079 2652 continue;
3c997079 2653
a0c6ad2e
MD		 2654 enabled = lttng_get_event_enabled_state(event);
2655 WRITE_ONCE(event->enabled, enabled);
3c997079 2656 /*
a0c6ad2e 2657 * Sync tracepoint registration with event enabled state.
3c997079
MD		 2658 */
2659 if (enabled) {
6a338ba4
MD		 2660 if (!event_priv->registered)
2661 register_event(event);
3c997079 2662 } else {
6a338ba4
MD		 2663 if (event_priv->registered)
2664 unregister_event(event);
3c997079 2665 }
07dfc1d0 2666
a0c6ad2e
MD		 2667 lttng_event_sync_filter_state(event);
2668 lttng_event_sync_capture_state(event);
3c997079
MD		 2669 }
2670}
2671
a0c6ad2e
MD		 2672/*
2673 * lttng_session_sync_event_enablers should be called just before starting a
2674 * session.
2675 */
2676static
2677void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
2678{
2679 lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events);
2680}
2681
3c997079
MD		 2682/*
2683 * Apply enablers to session events, adding events to session if need
2684 * be. It is required after each modification applied to an active
2685 * session, and right before session "start".
2686 * "lazy" sync means we only sync if required.
2687 * Should be called with sessions mutex held.
2688 */
2689static
8cdc1a81 2690void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2691{
2692 /* We can skip if session is not active */
2693 if (!session->active)
2694 return;
b2bc0bc8 2695 lttng_session_sync_event_enablers(session);
3c997079
MD		 2696}
2697
b01155ba
FD		 2698static
2699void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2700{
a0c6ad2e 2701 lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head);
b01155ba
FD		 2702}
2703
7b25ab0e
MD		 2704static
2705void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2706{
2707 switch (event_enabler->enabler_type) {
2708 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2709 {
2710 struct lttng_event_recorder_enabler *event_recorder_enabler =
2711 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2712 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2713 break;
2714 }
2715 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2716 {
2717 struct lttng_event_notifier_enabler *event_notifier_enabler =
2718 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2719 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2720 break;
2721 }
2722 default:
2723 WARN_ON_ONCE(1);
2724 }
2725}
2726
1ec3f75a 2727/*
d83004aa
JD		 2728 * Serialize at most one packet worth of metadata into a metadata
2729 * channel.
92d9f5e6
MD		 2730 * We grab the metadata cache mutex to get exclusive access to our metadata
2731 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2732 * allows us to do racy operations such as looking for remaining space left in
2733 * packet and write, since mutual exclusion protects us from concurrent writes.
2734 * Mutual exclusion on the metadata cache allow us to read the cache content
2735 * without racing against reallocation of the cache by updates.
35097f36
JD		 2736 * Returns the number of bytes written in the channel, 0 if no data
2737 * was written and a negative value on error.
1ec3f75a 2738 */
b3b8072b 2739int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2740 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2741{
8a57ec02 2742 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2743 int ret = 0;
2744 size_t len, reserve_len;
2745
f613e3e6 2746 /*
92d9f5e6
MD		 2747 * Ensure we support mutiple get_next / put sequences followed by
2748 * put_next. The metadata cache lock protects reading the metadata
2749 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2750 * "flush" operations on the buffer invoked by different processes.
2751 * Moreover, since the metadata cache memory can be reallocated, we
2752 * need to have exclusive access against updates even though we only
2753 * read it.
f613e3e6 2754 */
92d9f5e6 2755 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2756 WARN_ON(stream->metadata_in < stream->metadata_out);
2757 if (stream->metadata_in != stream->metadata_out)
de23d59d 2758 goto end;
f613e3e6 2759
9616f0bf
JD		 2760 /* Metadata regenerated, change the version. */
2761 if (stream->metadata_cache->version != stream->version)
2762 stream->version = stream->metadata_cache->version;
2763
d83004aa 2764 len = stream->metadata_cache->metadata_written -
f613e3e6 2765 stream->metadata_in;
9de2c215 2766 if (!len)
de23d59d 2767 goto end;
d83004aa 2768 reserve_len = min_t(size_t,
4a399b76 2769 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2770 len);
a775608d 2771 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2772 sizeof(char), NULL);
d83004aa
JD		 2773 /*
2774 * If reservation failed, return an error to the caller.
2775 */
c2fb9c1c 2776 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2777 if (ret != 0) {
2778 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2779 stream->coherent = false;
d83004aa
JD		 2780 goto end;
2781 }
b3b8072b 2782 stream->transport->ops.event_write(&ctx,
f613e3e6 2783 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2784 reserve_len, 1);
b3b8072b 2785 stream->transport->ops.event_commit(&ctx);
f613e3e6 2786 stream->metadata_in += reserve_len;
3e75e2a7 2787 if (reserve_len < len)
8b97fd42
MD		 2788 stream->coherent = false;
2789 else
2790 stream->coherent = true;
d83004aa
JD		 2791 ret = reserve_len;
2792
2793end:
8b97fd42
MD		 2794 if (coherent)
2795 *coherent = stream->coherent;
92d9f5e6 2796 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2797 return ret;
2798}
2799
8b97fd42 2800static
8cdc1a81 2801void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2802{
8cdc1a81
MD		 2803 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2804 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2805}
2806
2807static
8cdc1a81 2808void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2809{
8cdc1a81
MD		 2810 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2811 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2812 struct lttng_metadata_stream *stream;
2813
8cdc1a81 2814 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2815 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2816 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2817 }
8b97fd42
MD		 2818}
2819
d83004aa
JD		 2820/*
2821 * Write the metadata to the metadata cache.
2822 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2823 * The metadata cache lock protects us from concurrent read access from
2824 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2825 * The content of the printf is printed as a single atomic metadata
2826 * transaction.
d83004aa 2827 */
8cdc1a81 2828int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2829 const char *fmt, ...)
2830{
c099397a 2831 char *str;
d83004aa 2832 size_t len;
c099397a
MD		 2833 va_list ap;
2834
585e5dcc 2835 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2836
2837 va_start(ap, fmt);
2838 str = kvasprintf(GFP_KERNEL, fmt, ap);
2839 va_end(ap);
2840 if (!str)
2841 return -ENOMEM;
2842
1ec3f75a 2843 len = strlen(str);
8cdc1a81
MD		 2844 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2845 if (session->priv->metadata_cache->metadata_written + len >
2846 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2847 char *tmp_cache_realloc;
2848 unsigned int tmp_cache_alloc_size;
2849
2850 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2851 session->priv->metadata_cache->cache_alloc + len,
2852 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2853 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2854 if (!tmp_cache_realloc)
2855 goto err;
8cdc1a81 2856 if (session->priv->metadata_cache->data) {
a606b6e8 2857 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 2858 session->priv->metadata_cache->data,
2859 session->priv->metadata_cache->cache_alloc);
2860 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 2861 }
2862
8cdc1a81
MD		 2863 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2864 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 2865 }
8cdc1a81
MD		 2866 memcpy(session->priv->metadata_cache->data +
2867 session->priv->metadata_cache->metadata_written,
d83004aa 2868 str, len);
8cdc1a81 2869 session->priv->metadata_cache->metadata_written += len;
c099397a 2870 kfree(str);
d83004aa 2871
d83004aa
JD		 2872 return 0;
2873
2874err:
2875 kfree(str);
2876 return -ENOMEM;
c099397a
MD		 2877}
2878
f513b2bf 2879static
8cdc1a81 2880int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 2881{
2882 size_t i;
2883
2884 for (i = 0; i < nesting; i++) {
2885 int ret;
2886
2887 ret = lttng_metadata_printf(session, " ");
2888 if (ret) {
2889 return ret;
2890 }
2891 }
2892 return 0;
2893}
2894
ceabb767 2895static
8cdc1a81 2896int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 2897 const struct lttng_kernel_event_field *field,
ceabb767
MD		 2898 size_t nesting)
2899{
2900 return lttng_metadata_printf(session, " _%s;\n", field->name);
2901}
2902
2903static
8cdc1a81 2904int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 2905 const struct lttng_kernel_type_integer *type,
2906 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 2907 size_t nesting)
2908{
2909 int ret;
2910
ceabb767
MD		 2911 ret = print_tabs(session, nesting);
2912 if (ret)
2913 return ret;
2914 ret = lttng_metadata_printf(session,
2915 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 2916 type->size,
2917 type->alignment,
2918 type->signedness,
2919 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 2920 ? "none"
437d5aa5 2921 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 2922 ? "UTF8"
2923 : "ASCII",
437d5aa5 2924 type->base,
ceabb767 2925#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 2926 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 2927#else
437d5aa5 2928 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 2929#endif
2930 );
2931 return ret;
2932}
2933
f513b2bf
MD		 2934/*
2935 * Must be called with sessions_mutex held.
2936 */
2937static
8cdc1a81 2938int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 2939 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 2940 size_t nesting)
2941{
51ef4536 2942 const char *prev_field_name = NULL;
f513b2bf
MD		 2943 int ret;
2944 uint32_t i, nr_fields;
ceabb767
MD		 2945 unsigned int alignment;
2946
f513b2bf
MD		 2947 ret = print_tabs(session, nesting);
2948 if (ret)
2949 return ret;
2950 ret = lttng_metadata_printf(session,
2951 "struct {\n");
2952 if (ret)
2953 return ret;
437d5aa5 2954 nr_fields = type->nr_fields;
f513b2bf 2955 for (i = 0; i < nr_fields; i++) {
437d5aa5 2956 const struct lttng_kernel_event_field *iter_field;
f513b2bf 2957
437d5aa5 2958 iter_field = type->fields[i];
51ef4536 2959 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 2960 if (ret)
2961 return ret;
2962 }
2963 ret = print_tabs(session, nesting);
2964 if (ret)
2965 return ret;
437d5aa5 2966 alignment = type->alignment;
ceabb767
MD		 2967 if (alignment) {
2968 ret = lttng_metadata_printf(session,
2969 "} align(%u)",
2970 alignment);
2971 } else {
2972 ret = lttng_metadata_printf(session,
2973 "}");
2974 }
f513b2bf
MD		 2975 return ret;
2976}
2977
2978/*
2979 * Must be called with sessions_mutex held.
2980 */
2981static
8cdc1a81 2982int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 2983 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 2984 size_t nesting)
2985{
2986 int ret;
2987
2988 ret = _lttng_struct_type_statedump(session,
437d5aa5 2989 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 2990 if (ret)
2991 return ret;
ceabb767 2992 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 2993}
2994
65c85aa6
MD		 2995/*
2996 * Must be called with sessions_mutex held.
2997 */
2998static
8cdc1a81 2999int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3000 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3001 size_t nesting,
3002 const char *prev_field_name)
65c85aa6 3003{
51ef4536 3004 const char *tag_name;
65c85aa6
MD		 3005 int ret;
3006 uint32_t i, nr_choices;
3007
51ef4536
MD		 3008 tag_name = type->tag_name;
3009 if (!tag_name)
3010 tag_name = prev_field_name;
3011 if (!tag_name)
3012 return -EINVAL;
ceabb767
MD		 3013 /*
3014 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3015 */
437d5aa5 3016 if (type->alignment != 0)
ceabb767 3017 return -EINVAL;
65c85aa6
MD		 3018 ret = print_tabs(session, nesting);
3019 if (ret)
3020 return ret;
3021 ret = lttng_metadata_printf(session,
3022 "variant <_%s> {\n",
51ef4536 3023 tag_name);
65c85aa6
MD		 3024 if (ret)
3025 return ret;
437d5aa5 3026 nr_choices = type->nr_choices;
65c85aa6 3027 for (i = 0; i < nr_choices; i++) {
437d5aa5 3028 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3029
437d5aa5 3030 iter_field = type->choices[i];
51ef4536 3031 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3032 if (ret)
3033 return ret;
3034 }
3035 ret = print_tabs(session, nesting);
3036 if (ret)
3037 return ret;
3038 ret = lttng_metadata_printf(session,
3039 "}");
3040 return ret;
3041}
3042
3043/*
3044 * Must be called with sessions_mutex held.
3045 */
3046static
8cdc1a81 3047int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3048 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3049 size_t nesting,
3050 const char *prev_field_name)
65c85aa6
MD		 3051{
3052 int ret;
3053
3054 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3055 lttng_kernel_get_type_variant(field->type), nesting,
3056 prev_field_name);
65c85aa6
MD		 3057 if (ret)
3058 return ret;
ceabb767 3059 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3060}
3061
f513b2bf
MD		 3062/*
3063 * Must be called with sessions_mutex held.
3064 */
3065static
8cdc1a81 3066int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3067 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3068 size_t nesting)
3069{
3070 int ret;
437d5aa5
MD		 3071 const struct lttng_kernel_type_array *array_type;
3072 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3073
437d5aa5
MD		 3074 array_type = lttng_kernel_get_type_array(field->type);
3075 WARN_ON_ONCE(!array_type);
ceabb767 3076
437d5aa5 3077 if (array_type->alignment) {
ceabb767 3078 ret = print_tabs(session, nesting);
f513b2bf
MD		 3079 if (ret)
3080 return ret;
ceabb767
MD		 3081 ret = lttng_metadata_printf(session,
3082 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3083 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3084 field->name);
3085 if (ret)
3086 return ret;
3087 }
3088 /*
3089 * Nested compound types: Only array of structures and variants are
3090 * currently supported.
3091 */
437d5aa5 3092 elem_type = array_type->elem_type;
12bb2edb
MD		 3093 switch (elem_type->type) {
3094 case lttng_kernel_type_integer:
437d5aa5
MD		 3095 case lttng_kernel_type_struct:
3096 case lttng_kernel_type_variant:
3097 ret = _lttng_type_statedump(session, elem_type,
3098 array_type->encoding, nesting);
65c85aa6
MD		 3099 if (ret)
3100 return ret;
3101 break;
ceabb767 3102
f513b2bf
MD		 3103 default:
3104 return -EINVAL;
3105 }
3106 ret = lttng_metadata_printf(session,
3107 " _%s[%u];\n",
3108 field->name,
437d5aa5 3109 array_type->length);
f513b2bf
MD		 3110 return ret;
3111}
3112
3113/*
3114 * Must be called with sessions_mutex held.
3115 */
3116static
8cdc1a81 3117int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3118 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3119 size_t nesting,
3120 const char *prev_field_name)
f513b2bf
MD		 3121{
3122 int ret;
3123 const char *length_name;
437d5aa5
MD		 3124 const struct lttng_kernel_type_sequence *sequence_type;
3125 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3126
437d5aa5
MD		 3127 sequence_type = lttng_kernel_get_type_sequence(field->type);
3128 WARN_ON_ONCE(!sequence_type);
f513b2bf 3129
437d5aa5 3130 length_name = sequence_type->length_name;
51ef4536
MD		 3131 if (!length_name)
3132 length_name = prev_field_name;
3133 if (!length_name)
3134 return -EINVAL;
ceabb767 3135
437d5aa5 3136 if (sequence_type->alignment) {
ceabb767 3137 ret = print_tabs(session, nesting);
f513b2bf
MD		 3138 if (ret)
3139 return ret;
ceabb767
MD		 3140 ret = lttng_metadata_printf(session,
3141 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3142 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3143 field->name);
3144 if (ret)
3145 return ret;
3146 }
3147
3148 /*
3149 * Nested compound types: Only array of structures and variants are
3150 * currently supported.
3151 */
437d5aa5 3152 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3153 switch (elem_type->type) {
3154 case lttng_kernel_type_integer:
437d5aa5
MD		 3155 case lttng_kernel_type_struct:
3156 case lttng_kernel_type_variant:
3157 ret = _lttng_type_statedump(session, elem_type,
3158 sequence_type->encoding, nesting);
65c85aa6
MD		 3159 if (ret)
3160 return ret;
3161 break;
ceabb767 3162
f513b2bf
MD		 3163 default:
3164 return -EINVAL;
3165 }
3166 ret = lttng_metadata_printf(session,
3167 " _%s[ _%s ];\n",
3168 field->name,
51ef4536 3169 length_name);
f513b2bf
MD		 3170 return ret;
3171}
3172
141ddf28
MD		 3173/*
3174 * Must be called with sessions_mutex held.
3175 */
3176static
8cdc1a81 3177int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3178 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3179 size_t nesting)
3180{
d96a4a7a 3181 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3182 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3183 int ret;
3184 unsigned int i, nr_entries;
3185
437d5aa5 3186 container_type = type->container_type;
12bb2edb 3187 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3188 ret = -EINVAL;
3189 goto end;
3190 }
437d5aa5 3191 enum_desc = type->desc;
141ddf28
MD		 3192 nr_entries = enum_desc->nr_entries;
3193
3194 ret = print_tabs(session, nesting);
3195 if (ret)
3196 goto end;
ceabb767
MD		 3197 ret = lttng_metadata_printf(session, "enum : ");
3198 if (ret)
3199 goto end;
437d5aa5
MD		 3200 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3201 lttng_kernel_string_encoding_none, 0);
141ddf28 3202 if (ret)
ceabb767
MD		 3203 goto end;
3204 ret = lttng_metadata_printf(session, " {\n");
3205 if (ret)
3206 goto end;
141ddf28
MD		 3207 /* Dump all entries */
3208 for (i = 0; i < nr_entries; i++) {
437d5aa5 3209 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3210 int j, len;
3211
3212 ret = print_tabs(session, nesting + 1);
3213 if (ret)
3214 goto end;
3215 ret = lttng_metadata_printf(session,
3216 "\"");
3217 if (ret)
3218 goto end;
3219 len = strlen(entry->string);
3220 /* Escape the character '"' */
3221 for (j = 0; j < len; j++) {
3222 char c = entry->string[j];
3223
3224 switch (c) {
3225 case '"':
3226 ret = lttng_metadata_printf(session,
3227 "\\\"");
3228 break;
3229 case '\\':
3230 ret = lttng_metadata_printf(session,
3231 "\\\\");
3232 break;
3233 default:
3234 ret = lttng_metadata_printf(session,
3235 "%c", c);
3236 break;
3237 }
3238 if (ret)
3239 goto end;
3240 }
08ad1061
PP		 3241 ret = lttng_metadata_printf(session, "\"");
3242 if (ret)
3243 goto end;
3244
3245 if (entry->options.is_auto) {
3246 ret = lttng_metadata_printf(session, ",\n");
3247 if (ret)
3248 goto end;
141ddf28 3249 } else {
7c559490
MD		 3250 ret = lttng_metadata_printf(session,
3251 " = ");
3252 if (ret)
3253 goto end;
3254 if (entry->start.signedness)
141ddf28 3255 ret = lttng_metadata_printf(session,
7c559490
MD		 3256 "%lld", (long long) entry->start.value);
3257 else
3258 ret = lttng_metadata_printf(session,
3259 "%llu", entry->start.value);
3260 if (ret)
3261 goto end;
3262 if (entry->start.signedness == entry->end.signedness &&
3263 entry->start.value
3264 == entry->end.value) {
141ddf28 3265 ret = lttng_metadata_printf(session,
7c559490
MD		 3266 ",\n");
3267 } else {
3268 if (entry->end.signedness) {
3269 ret = lttng_metadata_printf(session,
3270 " ... %lld,\n",
3271 (long long) entry->end.value);
3272 } else {
3273 ret = lttng_metadata_printf(session,
3274 " ... %llu,\n",
3275 entry->end.value);
3276 }
141ddf28 3277 }
7c559490
MD		 3278 if (ret)
3279 goto end;
141ddf28 3280 }
141ddf28
MD		 3281 }
3282 ret = print_tabs(session, nesting);
3283 if (ret)
3284 goto end;
ceabb767 3285 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3286end:
3287 return ret;
3288}
3289
d83004aa
JD		 3290/*
3291 * Must be called with sessions_mutex held.
3292 */
c099397a 3293static
8cdc1a81 3294int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3295 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3296 size_t nesting)
3297{
3298 int ret;
437d5aa5 3299 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3300
437d5aa5
MD		 3301 enum_type = lttng_kernel_get_type_enum(field->type);
3302 WARN_ON_ONCE(!enum_type);
3303 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3304 if (ret)
3305 return ret;
3306 return lttng_field_name_statedump(session, field, nesting);
3307}
3308
3309static
8cdc1a81 3310int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3311 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3312 size_t nesting)
3313{
3314 int ret;
3315
437d5aa5
MD		 3316 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3317 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3318 if (ret)
3319 return ret;
3320 return lttng_field_name_statedump(session, field, nesting);
3321}
3322
3323static
8cdc1a81 3324int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3325 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3326 size_t nesting)
3327{
3328 int ret;
3329
ceabb767
MD		 3330 /* Default encoding is UTF8 */
3331 ret = print_tabs(session, nesting);
3332 if (ret)
3333 return ret;
3334 ret = lttng_metadata_printf(session,
3335 "string%s",
437d5aa5 3336 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3337 " { encoding = ASCII; }" : "");
3338 return ret;
3339}
3340
3341static
8cdc1a81 3342int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3343 const struct lttng_kernel_event_field *field,
f513b2bf 3344 size_t nesting)
ceabb767 3345{
437d5aa5 3346 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3347 int ret;
3348
437d5aa5
MD		 3349 string_type = lttng_kernel_get_type_string(field->type);
3350 WARN_ON_ONCE(!string_type);
3351 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3352 if (ret)
3353 return ret;
3354 return lttng_field_name_statedump(session, field, nesting);
3355}
3356
3357/*
3358 * Must be called with sessions_mutex held.
3359 */
3360static
8cdc1a81 3361int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3362 const struct lttng_kernel_type_common *type,
3363 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3364 size_t nesting)
c099397a 3365{
c099397a 3366 int ret = 0;
c099397a 3367
12bb2edb
MD		 3368 switch (type->type) {
3369 case lttng_kernel_type_integer:
437d5aa5
MD		 3370 ret = _lttng_integer_type_statedump(session,
3371 lttng_kernel_get_type_integer(type),
3372 parent_encoding, nesting);
8070f5c0 3373 break;
437d5aa5
MD		 3374 case lttng_kernel_type_enum:
3375 ret = _lttng_enum_type_statedump(session,
3376 lttng_kernel_get_type_enum(type),
3377 nesting);
8070f5c0 3378 break;
12bb2edb 3379 case lttng_kernel_type_string:
437d5aa5
MD		 3380 ret = _lttng_string_type_statedump(session,
3381 lttng_kernel_get_type_string(type),
3382 nesting);
ceabb767 3383 break;
437d5aa5
MD		 3384 case lttng_kernel_type_struct:
3385 ret = _lttng_struct_type_statedump(session,
3386 lttng_kernel_get_type_struct(type),
3387 nesting);
8070f5c0 3388 break;
437d5aa5
MD		 3389 case lttng_kernel_type_variant:
3390 ret = _lttng_variant_type_statedump(session,
3391 lttng_kernel_get_type_variant(type),
51ef4536 3392 nesting, NULL);
ceabb767
MD		 3393 break;
3394
3395 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3396 case lttng_kernel_type_array:
3397 case lttng_kernel_type_sequence:
ceabb767
MD		 3398 default:
3399 WARN_ON_ONCE(1);
3400 return -EINVAL;
8070f5c0 3401 }
ceabb767
MD		 3402 return ret;
3403}
8070f5c0 3404
ceabb767
MD		 3405/*
3406 * Must be called with sessions_mutex held.
3407 */
3408static
8cdc1a81 3409int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3410 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3411 size_t nesting,
3412 const char **prev_field_name_p)
ceabb767 3413{
51ef4536 3414 const char *prev_field_name = NULL;
ceabb767 3415 int ret = 0;
27d2368e 3416
51ef4536
MD		 3417 if (prev_field_name_p)
3418 prev_field_name = *prev_field_name_p;
437d5aa5 3419 switch (field->type->type) {
12bb2edb 3420 case lttng_kernel_type_integer:
ceabb767
MD		 3421 ret = _lttng_integer_field_statedump(session, field, nesting);
3422 break;
437d5aa5 3423 case lttng_kernel_type_enum:
ceabb767 3424 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3425 break;
12bb2edb 3426 case lttng_kernel_type_string:
ceabb767 3427 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3428 break;
437d5aa5 3429 case lttng_kernel_type_struct:
ceabb767 3430 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3431 break;
437d5aa5 3432 case lttng_kernel_type_array:
ceabb767 3433 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3434 break;
437d5aa5 3435 case lttng_kernel_type_sequence:
51ef4536 3436 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3437 break;
437d5aa5 3438 case lttng_kernel_type_variant:
51ef4536 3439 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3440 break;
f513b2bf 3441
8070f5c0
MD		 3442 default:
3443 WARN_ON_ONCE(1);
3444 return -EINVAL;
3445 }
51ef4536
MD		 3446 if (prev_field_name_p)
3447 *prev_field_name_p = field->name;
8070f5c0
MD		 3448 return ret;
3449}
3450
3451static
8cdc1a81 3452int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3453 struct lttng_kernel_ctx *ctx)
8070f5c0 3454{
51ef4536 3455 const char *prev_field_name = NULL;
8070f5c0
MD		 3456 int ret = 0;
3457 int i;
3458
3459 if (!ctx)
3460 return 0;
3461 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3462 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3463
51ef4536 3464 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3465 if (ret)
3466 return ret;
3467 }
3468 return ret;
3469}
3470
3471static
8cdc1a81 3472int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3473 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3474{
51ef4536 3475 const char *prev_field_name = NULL;
a67ba386 3476 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3477 int ret = 0;
3478 int i;
3479
6c8c025b
MD		 3480 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3481 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3482
51ef4536 3483 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3484 if (ret)
3485 return ret;
c099397a
MD		 3486 }
3487 return ret;
3488}
3489
d83004aa
JD		 3490/*
3491 * Must be called with sessions_mutex held.
8b97fd42
MD		 3492 * The entire event metadata is printed as a single atomic metadata
3493 * transaction.
d83004aa 3494 */
c099397a 3495static
ee7e9a18 3496int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event)
c099397a 3497{
ee7e9a18
MD		 3498 struct lttng_kernel_event_recorder *event_recorder;
3499 struct lttng_kernel_channel_buffer *chan;
3500 struct lttng_kernel_session *session;
c099397a
MD		 3501 int ret = 0;
3502
ee7e9a18
MD		 3503 if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER)
3504 return 0;
3505 event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent);
3506 chan = event_recorder->chan;
3507 session = chan->parent.session;
3508
a67ba386 3509 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3510 return 0;
f7d06400 3511 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3512 return 0;
3513
8b97fd42
MD		 3514 lttng_metadata_begin(session);
3515
c099397a
MD		 3516 ret = lttng_metadata_printf(session,
3517 "event {\n"
ae734547 3518 " name = \"%s\";\n"
c099397a 3519 " id = %u;\n"
b9074a1b 3520 " stream_id = %u;\n",
a67ba386
MD		 3521 event_recorder->priv->parent.desc->event_name,
3522 event_recorder->priv->id,
f7d06400 3523 event_recorder->chan->priv->id);
c099397a
MD		 3524 if (ret)
3525 goto end;
3526
8070f5c0 3527 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3528 " fields := struct {\n"
3529 );
3530 if (ret)
3531 goto end;
3532
a67ba386 3533 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3534 if (ret)
3535 goto end;
3536
3537 /*
3538 * LTTng space reservation can only reserve multiples of the
3539 * byte size.
3540 */
3541 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3542 " };\n"
3543 "};\n\n");
c099397a
MD		 3544 if (ret)
3545 goto end;
3546
a67ba386 3547 event_recorder->priv->metadata_dumped = 1;
c099397a 3548end:
8b97fd42 3549 lttng_metadata_end(session);
c099397a
MD		 3550 return ret;
3551
3552}
3553
d83004aa
JD		 3554/*
3555 * Must be called with sessions_mutex held.
8b97fd42
MD		 3556 * The entire channel metadata is printed as a single atomic metadata
3557 * transaction.
d83004aa 3558 */
c099397a 3559static
8cdc1a81 3560int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3561 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3562{
3563 int ret = 0;
3564
f7d06400 3565 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3566 return 0;
d83004aa 3567
f7d06400 3568 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3569 return 0;
3570
8b97fd42
MD		 3571 lttng_metadata_begin(session);
3572
f7d06400 3573 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3574 ret = lttng_metadata_printf(session,
3575 "stream {\n"
3576 " id = %u;\n"
9115fbdc 3577 " event.header := %s;\n"
b9074a1b 3578 " packet.context := struct packet_context;\n",
f7d06400
MD		 3579 chan->priv->id,
3580 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3581 "struct event_header_large");
3582 if (ret)
3583 goto end;
3584
f7d06400 3585 if (chan->priv->ctx) {
b9074a1b
MD		 3586 ret = lttng_metadata_printf(session,
3587 " event.context := struct {\n");
3588 if (ret)
3589 goto end;
3590 }
f7d06400 3591 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3592 if (ret)
3593 goto end;
f7d06400 3594 if (chan->priv->ctx) {
b9074a1b
MD		 3595 ret = lttng_metadata_printf(session,
3596 " };\n");
3597 if (ret)
3598 goto end;
3599 }
8070f5c0
MD		 3600
3601 ret = lttng_metadata_printf(session,
b9074a1b 3602 "};\n\n");
8070f5c0 3603
f7d06400 3604 chan->priv->metadata_dumped = 1;
c099397a 3605end:
8b97fd42 3606 lttng_metadata_end(session);
c099397a
MD		 3607 return ret;
3608}
3609
d83004aa
JD		 3610/*
3611 * Must be called with sessions_mutex held.
3612 */
9115fbdc 3613static
8cdc1a81 3614int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3615{
3616 return lttng_metadata_printf(session,
3617 "struct packet_context {\n"
a3ccff4f
MD		 3618 " uint64_clock_monotonic_t timestamp_begin;\n"
3619 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3620 " uint64_t content_size;\n"
3621 " uint64_t packet_size;\n"
5b3cf4f9 3622 " uint64_t packet_seq_num;\n"
a9afe705 3623 " unsigned long events_discarded;\n"
9115fbdc 3624 " uint32_t cpu_id;\n"
c6dfdf6f 3625 "};\n\n"
9115fbdc
MD		 3626 );
3627}
3628
3629/*
3630 * Compact header:
3631 * id: range: 0 - 30.
3632 * id 31 is reserved to indicate an extended header.
3633 *
3634 * Large header:
3635 * id: range: 0 - 65534.
3636 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3637 *
3638 * Must be called with sessions_mutex held.
9115fbdc
MD		 3639 */
3640static
8cdc1a81 3641int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3642{
3643 return lttng_metadata_printf(session,
3644 "struct event_header_compact {\n"
3645 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3646 " variant <id> {\n"
3647 " struct {\n"
a3ccff4f 3648 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3649 " } compact;\n"
3650 " struct {\n"
3651 " uint32_t id;\n"
a3ccff4f 3652 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3653 " } extended;\n"
3654 " } v;\n"
3655 "} align(%u);\n"
3656 "\n"
3657 "struct event_header_large {\n"
3658 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3659 " variant <id> {\n"
3660 " struct {\n"
a3ccff4f 3661 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3662 " } compact;\n"
3663 " struct {\n"
3664 " uint32_t id;\n"
a3ccff4f 3665 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3666 " } extended;\n"
3667 " } v;\n"
3668 "} align(%u);\n\n",
a90917c3
MD		 3669 lttng_alignof(uint32_t) * CHAR_BIT,
3670 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3671 );
3672}
3673
a3ccff4f
MD		 3674 /*
3675 * Approximation of NTP time of day to clock monotonic correlation,
3676 * taken at start of trace.
3677 * Yes, this is only an approximation. Yes, we can (and will) do better
3678 * in future versions.
5283350b
MD		 3679 * This function may return a negative offset. It may happen if the
3680 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3681 *
3682 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3683 * y2038 compliant.
a3ccff4f
MD		 3684 */
3685static
8967b2a3 3686int64_t measure_clock_offset(void)
a3ccff4f 3687{
dcb93448 3688 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3689 uint64_t tcf = trace_clock_freq();
dcb93448 3690 int64_t offset;
a3ccff4f 3691 unsigned long flags;
3636085f
MJ		 3692#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3693 struct timespec64 rts = { 0, 0 };
3694#else
3695 struct timespec rts = { 0, 0 };
3696#endif
a3ccff4f
MD		 3697
3698 /* Disable interrupts to increase correlation precision. */
3699 local_irq_save(flags);
3700 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3701#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3702 ktime_get_real_ts64(&rts);
3703#else
216b6baa 3704 getnstimeofday(&rts);
3636085f 3705#endif
a3ccff4f
MD		 3706 monotonic[1] = trace_clock_read64();
3707 local_irq_restore(flags);
3708
dcb93448 3709 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3710 realtime = (uint64_t) rts.tv_sec * tcf;
3711 if (tcf == NSEC_PER_SEC) {
3712 realtime += rts.tv_nsec;
3713 } else {
3714 uint64_t n = rts.tv_nsec * tcf;
3715
3716 do_div(n, NSEC_PER_SEC);
3717 realtime += n;
3718 }
dcb93448 3719 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3720 return offset;
3721}
3722
3eb95be4 3723static
8cdc1a81 3724int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3725{
0f3eaad4 3726 int ret = 0;
3eb95be4
JR		 3727 size_t i;
3728 char cur;
3729
3730 i = 0;
3731 cur = string[i];
3732 while (cur != '\0') {
3733 switch (cur) {
3734 case '\n':
3735 ret = lttng_metadata_printf(session, "%s", "\\n");
3736 break;
3737 case '\\':
3738 case '"':
3739 ret = lttng_metadata_printf(session, "%c", '\\');
3740 if (ret)
3741 goto error;
3742 /* We still print the current char */
c190d76e 3743 lttng_fallthrough;
3eb95be4
JR		 3744 default:
3745 ret = lttng_metadata_printf(session, "%c", cur);
3746 break;
3747 }
3748
3749 if (ret)
3750 goto error;
3751
3752 cur = string[++i];
3753 }
3754error:
3755 return ret;
3756}
3757
3758static
8cdc1a81 3759int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3760 const char *field_value)
3eb95be4
JR		 3761{
3762 int ret;
3763
1c88f269 3764 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3765 if (ret)
3766 goto error;
3767
1c88f269 3768 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3769 if (ret)
3770 goto error;
3771
3772 ret = lttng_metadata_printf(session, "\";\n");
3773
3774error:
3775 return ret;
3776}
3777
c099397a
MD		 3778/*
3779 * Output metadata into this session's metadata buffers.
d83004aa 3780 * Must be called with sessions_mutex held.
c099397a
MD		 3781 */
3782static
8cdc1a81 3783int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3784{
8cdc1a81 3785 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3786 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3787 const char *product_uuid;
f7d06400 3788 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3789 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3790 int ret = 0;
3791
585e5dcc 3792 if (!LTTNG_READ_ONCE(session->active))
c099397a 3793 return 0;
8b97fd42
MD		 3794
3795 lttng_metadata_begin(session);
3796
8cdc1a81 3797 if (session->priv->metadata_dumped)
c099397a 3798 goto skip_session;
c099397a 3799
d793d5e1 3800 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3801 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3802 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3803 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3804 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3805 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3806
3807 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3808 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3809 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3810 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3811 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3812 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3813 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3814 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3815 "\n"
3816 "trace {\n"
3817 " major = %u;\n"
3818 " minor = %u;\n"
30bdb6e4 3819 " uuid = \"%s\";\n"
d793d5e1
MD		 3820 " byte_order = %s;\n"
3821 " packet.header := struct {\n"
3822 " uint32_t magic;\n"
1ec3f75a 3823 " uint8_t uuid[16];\n"
d793d5e1 3824 " uint32_t stream_id;\n"
5594698f 3825 " uint64_t stream_instance_id;\n"
0eb25f58 3826 " };\n"
d793d5e1 3827 "};\n\n",
a90917c3
MD		 3828 lttng_alignof(uint8_t) * CHAR_BIT,
3829 lttng_alignof(uint16_t) * CHAR_BIT,
3830 lttng_alignof(uint32_t) * CHAR_BIT,
3831 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3832 sizeof(unsigned long) * CHAR_BIT,
3833 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3834 CTF_SPEC_MAJOR,
3835 CTF_SPEC_MINOR,
d793d5e1 3836 uuid_s,
5214fa50 3837#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3838 "be"
3839#else
3840 "le"
3841#endif
3842 );
3843 if (ret)
3844 goto end;
3845
99dc9597
MD		 3846 ret = lttng_metadata_printf(session,
3847 "env {\n"
a6058143 3848 " hostname = \"%s\";\n"
c6c9e10f 3849 " domain = \"kernel\";\n"
99dc9597 3850 " sysname = \"%s\";\n"
c6c9e10f
MD		 3851 " kernel_release = \"%s\";\n"
3852 " kernel_version = \"%s\";\n"
3853 " tracer_name = \"lttng-modules\";\n"
3854 " tracer_major = %d;\n"
3855 " tracer_minor = %d;\n"
3856 " tracer_patchlevel = %d;\n"
3eb95be4 3857 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3858 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3859 utsname()->sysname,
3860 utsname()->release,
c6c9e10f
MD		 3861 utsname()->version,
3862 LTTNG_MODULES_MAJOR_VERSION,
3863 LTTNG_MODULES_MINOR_VERSION,
3864 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3865 );
3866 if (ret)
3867 goto end;
3868
8cdc1a81 3869 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 3870 if (ret)
3871 goto end;
3872 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 3873 session->priv->creation_time);
3eb95be4
JR		 3874 if (ret)
3875 goto end;
3876
c88f762e
GB		 3877 /* Add the product UUID to the 'env' section */
3878 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3879 if (product_uuid) {
3880 ret = lttng_metadata_printf(session,
3881 " product_uuid = \"%s\";\n",
3882 product_uuid
3883 );
3884 if (ret)
3885 goto end;
3886 }
3887
3888 /* Close the 'env' section */
3eb95be4
JR		 3889 ret = lttng_metadata_printf(session, "};\n\n");
3890 if (ret)
3891 goto end;
3892
a3ccff4f
MD		 3893 ret = lttng_metadata_printf(session,
3894 "clock {\n"
2754583e
MD		 3895 " name = \"%s\";\n",
3896 trace_clock_name()
a82c63f1
MD		 3897 );
3898 if (ret)
3899 goto end;
3900
3901 if (!trace_clock_uuid(clock_uuid_s)) {
3902 ret = lttng_metadata_printf(session,
7c27cb17 3903 " uuid = \"%s\";\n",
a82c63f1
MD		 3904 clock_uuid_s
3905 );
3906 if (ret)
3907 goto end;
3908 }
3909
3910 ret = lttng_metadata_printf(session,
2754583e 3911 " description = \"%s\";\n"
a3ccff4f
MD		 3912 " freq = %llu; /* Frequency, in Hz */\n"
3913 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 3914 " offset = %lld;\n"
a3ccff4f 3915 "};\n\n",
2754583e 3916 trace_clock_description(),
a3ccff4f 3917 (unsigned long long) trace_clock_freq(),
8967b2a3 3918 (long long) measure_clock_offset()
a3ccff4f
MD		 3919 );
3920 if (ret)
3921 goto end;
3922
3923 ret = lttng_metadata_printf(session,
3924 "typealias integer {\n"
3925 " size = 27; align = 1; signed = false;\n"
2754583e 3926 " map = clock.%s.value;\n"
a3ccff4f
MD		 3927 "} := uint27_clock_monotonic_t;\n"
3928 "\n"
3929 "typealias integer {\n"
3930 " size = 32; align = %u; signed = false;\n"
2754583e 3931 " map = clock.%s.value;\n"
a3ccff4f
MD		 3932 "} := uint32_clock_monotonic_t;\n"
3933 "\n"
3934 "typealias integer {\n"
3935 " size = 64; align = %u; signed = false;\n"
2754583e 3936 " map = clock.%s.value;\n"
a3ccff4f 3937 "} := uint64_clock_monotonic_t;\n\n",
2754583e 3938 trace_clock_name(),
a3ccff4f 3939 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 3940 trace_clock_name(),
3941 lttng_alignof(uint64_t) * CHAR_BIT,
3942 trace_clock_name()
a3ccff4f
MD		 3943 );
3944 if (ret)
3945 goto end;
3946
a90917c3 3947 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 3948 if (ret)
3949 goto end;
3950
a90917c3 3951 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 3952 if (ret)
3953 goto end;
3954
c099397a 3955skip_session:
f7d06400
MD		 3956 list_for_each_entry(chan_priv, &session->priv->chan, node) {
3957 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 3958 if (ret)
3959 goto end;
3960 }
3961
f237aef8 3962 list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) {
ee7e9a18 3963 ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent);
c099397a
MD		 3964 if (ret)
3965 goto end;
3966 }
8cdc1a81 3967 session->priv->metadata_dumped = 1;
c099397a 3968end:
8b97fd42 3969 lttng_metadata_end(session);
c099397a
MD		 3970 return ret;
3971}
3972
c0e31d2e 3973/**
a90917c3 3974 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 3975 * @transport: transport structure
3976 *
3977 * Registers a transport which can be used as output to extract the data out of
3978 * LTTng. The module calling this registration function must ensure that no
3979 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 3980 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 3981 * is made visible to the transport function. This registration acts as a
263b6c88 3982 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 3983 * after its registration must it synchronize the TLBs.
3984 */
a90917c3 3985void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 3986{
3987 /*
3988 * Make sure no page fault can be triggered by the module about to be
3989 * registered. We deal with this here so we don't have to call
263b6c88 3990 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 3991 */
263b6c88 3992 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 3993
3994 mutex_lock(&sessions_mutex);
a90917c3 3995 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 3996 mutex_unlock(&sessions_mutex);
3997}
a90917c3 3998EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 3999
4000/**
a90917c3 4001 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4002 * @transport: transport structure
4003 */
a90917c3 4004void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4005{
4006 mutex_lock(&sessions_mutex);
4007 list_del(&transport->node);
4008 mutex_unlock(&sessions_mutex);
4009}
a90917c3 4010EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4011
a101fa10
MD		 4012void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4013{
4014 /*
4015 * Make sure no page fault can be triggered by the module about to be
4016 * registered. We deal with this here so we don't have to call
4017 * vmalloc_sync_mappings() in each module's init.
4018 */
4019 wrapper_vmalloc_sync_mappings();
4020
4021 mutex_lock(&sessions_mutex);
4022 list_add_tail(&transport->node, &lttng_counter_transport_list);
4023 mutex_unlock(&sessions_mutex);
4024}
4025EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4026
4027void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4028{
4029 mutex_lock(&sessions_mutex);
4030 list_del(&transport->node);
4031 mutex_unlock(&sessions_mutex);
4032}
4033EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4034
5f4c791e 4035#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4036
4037enum cpuhp_state lttng_hp_prepare;
4038enum cpuhp_state lttng_hp_online;
4039
4040static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4041{
4042 struct lttng_cpuhp_node *lttng_node;
4043
4044 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4045 switch (lttng_node->component) {
4046 case LTTNG_RING_BUFFER_FRONTEND:
4047 return 0;
4048 case LTTNG_RING_BUFFER_BACKEND:
4049 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4050 case LTTNG_RING_BUFFER_ITER:
4051 return 0;
4052 case LTTNG_CONTEXT_PERF_COUNTERS:
4053 return 0;
4054 default:
4055 return -EINVAL;
4056 }
4057}
4058
4059static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4060{
4061 struct lttng_cpuhp_node *lttng_node;
4062
4063 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4064 switch (lttng_node->component) {
4065 case LTTNG_RING_BUFFER_FRONTEND:
4066 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4067 case LTTNG_RING_BUFFER_BACKEND:
4068 return 0;
4069 case LTTNG_RING_BUFFER_ITER:
4070 return 0;
4071 case LTTNG_CONTEXT_PERF_COUNTERS:
4072 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4073 default:
4074 return -EINVAL;
4075 }
4076}
4077
4078static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4079{
4080 struct lttng_cpuhp_node *lttng_node;
4081
4082 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4083 switch (lttng_node->component) {
4084 case LTTNG_RING_BUFFER_FRONTEND:
4085 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4086 case LTTNG_RING_BUFFER_BACKEND:
4087 return 0;
4088 case LTTNG_RING_BUFFER_ITER:
4089 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4090 case LTTNG_CONTEXT_PERF_COUNTERS:
4091 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4092 default:
4093 return -EINVAL;
4094 }
4095}
4096
4097static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4098{
4099 struct lttng_cpuhp_node *lttng_node;
4100
4101 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4102 switch (lttng_node->component) {
4103 case LTTNG_RING_BUFFER_FRONTEND:
4104 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4105 case LTTNG_RING_BUFFER_BACKEND:
4106 return 0;
4107 case LTTNG_RING_BUFFER_ITER:
4108 return 0;
4109 case LTTNG_CONTEXT_PERF_COUNTERS:
4110 return 0;
4111 default:
4112 return -EINVAL;
4113 }
4114}
4115
4116static int __init lttng_init_cpu_hotplug(void)
4117{
4118 int ret;
4119
4120 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4121 lttng_hotplug_prepare,
4122 lttng_hotplug_dead);
4123 if (ret < 0) {
4124 return ret;
4125 }
4126 lttng_hp_prepare = ret;
4127 lttng_rb_set_hp_prepare(ret);
4128
4129 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4130 lttng_hotplug_online,
4131 lttng_hotplug_offline);
4132 if (ret < 0) {
4133 cpuhp_remove_multi_state(lttng_hp_prepare);
4134 lttng_hp_prepare = 0;
4135 return ret;
4136 }
4137 lttng_hp_online = ret;
4138 lttng_rb_set_hp_online(ret);
4139
4140 return 0;
4141}
4142
4143static void __exit lttng_exit_cpu_hotplug(void)
4144{
4145 lttng_rb_set_hp_online(0);
4146 cpuhp_remove_multi_state(lttng_hp_online);
4147 lttng_rb_set_hp_prepare(0);
4148 cpuhp_remove_multi_state(lttng_hp_prepare);
4149}
4150
5f4c791e 4151#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4152static int lttng_init_cpu_hotplug(void)
4153{
4154 return 0;
4155}
4156static void lttng_exit_cpu_hotplug(void)
4157{
4158}
5f4c791e 4159#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4160
a90917c3 4161static int __init lttng_events_init(void)
4e3c1b9b 4162{
1c25284c
MD		 4163 int ret;
4164
453b2495
JD		 4165 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4166 if (ret)
4167 return ret;
389d7070 4168 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4169 if (ret)
4170 return ret;
4171 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4172 if (ret)
4173 return ret;
4174 ret = lttng_probes_init();
389d7070
MD		 4175 if (ret)
4176 return ret;
07dfc1d0 4177 ret = lttng_context_init();
20591cf7
MD		 4178 if (ret)
4179 return ret;
07dfc1d0
MD		 4180 ret = lttng_tracepoint_init();
4181 if (ret)
4182 goto error_tp;
a67ba386
MD		 4183 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4184 if (!event_recorder_cache) {
20591cf7 4185 ret = -ENOMEM;
a67ba386 4186 goto error_kmem_event_recorder;
dffef45d 4187 }
a67ba386
MD		 4188 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4189 if (!event_recorder_private_cache) {
4190 ret = -ENOMEM;
4191 goto error_kmem_event_recorder_private;
4192 }
4193 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4194 if (!event_notifier_cache) {
4195 ret = -ENOMEM;
4196 goto error_kmem_event_notifier;
20591cf7 4197 }
a67ba386
MD		 4198 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4199 if (!event_notifier_private_cache) {
4200 ret = -ENOMEM;
4201 goto error_kmem_event_notifier_private;
4202 }
80996790 4203 ret = lttng_abi_init();
02119ee5
MD		 4204 if (ret)
4205 goto error_abi;
0c956676
MD		 4206 ret = lttng_logger_init();
4207 if (ret)
4208 goto error_logger;
1e367326
MD		 4209 ret = lttng_init_cpu_hotplug();
4210 if (ret)
4211 goto error_hotplug;
101215b7 4212 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4213 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4214 __stringify(LTTNG_MODULES_MINOR_VERSION),
4215 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4216 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4217 LTTNG_VERSION_NAME,
4218#ifdef LTTNG_EXTRA_VERSION_GIT
4219 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4220#else
4221 "",
4222#endif
4223#ifdef LTTNG_EXTRA_VERSION_NAME
4224 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4225#else
4226 "");
4227#endif
c1551e57
MJ		 4228#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4229 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4230#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4231 return 0;
0c956676 4232
1e367326
MD		 4233error_hotplug:
4234 lttng_logger_exit();
0c956676
MD		 4235error_logger:
4236 lttng_abi_exit();
02119ee5 4237error_abi:
a67ba386
MD		 4238 kmem_cache_destroy(event_notifier_private_cache);
4239error_kmem_event_notifier_private:
dffef45d
FD		 4240 kmem_cache_destroy(event_notifier_cache);
4241error_kmem_event_notifier:
a67ba386
MD		 4242 kmem_cache_destroy(event_recorder_private_cache);
4243error_kmem_event_recorder_private:
4244 kmem_cache_destroy(event_recorder_cache);
4245error_kmem_event_recorder:
20591cf7 4246 lttng_tracepoint_exit();
07dfc1d0
MD		 4247error_tp:
4248 lttng_context_exit();
101215b7 4249 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4250 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4251 __stringify(LTTNG_MODULES_MINOR_VERSION),
4252 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4253 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4254 LTTNG_VERSION_NAME,
4255#ifdef LTTNG_EXTRA_VERSION_GIT
4256 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4257#else
4258 "",
4259#endif
4260#ifdef LTTNG_EXTRA_VERSION_NAME
4261 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4262#else
4263 "");
4264#endif
1c25284c 4265 return ret;
4e3c1b9b
MD		 4266}
4267
a90917c3 4268module_init(lttng_events_init);
11b5a3c2 4269
a90917c3 4270static void __exit lttng_events_exit(void)
4e3c1b9b 4271{
8cdc1a81 4272 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4273
1e367326 4274 lttng_exit_cpu_hotplug();
0c956676 4275 lttng_logger_exit();
80996790 4276 lttng_abi_exit();
8cdc1a81
MD		 4277 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4278 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4279 kmem_cache_destroy(event_recorder_cache);
4280 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4281 kmem_cache_destroy(event_notifier_cache);
a67ba386 4282 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4283 lttng_tracepoint_exit();
07dfc1d0 4284 lttng_context_exit();
101215b7 4285 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4286 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4287 __stringify(LTTNG_MODULES_MINOR_VERSION),
4288 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4289 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4290 LTTNG_VERSION_NAME,
4291#ifdef LTTNG_EXTRA_VERSION_GIT
4292 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4293#else
4294 "",
4295#endif
4296#ifdef LTTNG_EXTRA_VERSION_NAME
4297 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4298#else
4299 "");
4300#endif
4e3c1b9b 4301}
92e94819 4302
a90917c3 4303module_exit(lttng_events_exit);
11b5a3c2 4304
7ca11e77 4305#include <generated/patches.h>
101215b7
MJ		 4306#ifdef LTTNG_EXTRA_VERSION_GIT
4307MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4308#endif
4309#ifdef LTTNG_EXTRA_VERSION_NAME
4310MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4311#endif
92e94819
MD		 4312MODULE_LICENSE("GPL and additional rights");
4313MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4314MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4315MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4316 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4317 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4318 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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