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Rename struct lttng_enabler to struct lttng_event_enabler_common
[lttng-modules.git] / src / lttng-events.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
a90917c3 3 * lttng-events.c
4e3c1b9b 4 *
4e3c1b9b 5 * Holds LTTng per-session event registry.
17baffe2 6 *
886d51a3 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4e3c1b9b
MD		 8 */
9
389d7070
MD		 10/*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14#include "wrapper/page_alloc.h"
15
4e3c1b9b 16#include <linux/module.h>
c0e31d2e
MD		 17#include <linux/mutex.h>
18#include <linux/sched.h>
11b5a3c2 19#include <linux/slab.h>
c099397a 20#include <linux/jiffies.h>
99dc9597 21#include <linux/utsname.h>
abc0446a 22#include <linux/err.h>
7e6f9ef6
MD		 23#include <linux/seq_file.h>
24#include <linux/file.h>
25#include <linux/anon_inodes.h>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
c190d76e 31#include <wrapper/compiler_attributes.h>
a7008254 32#include <wrapper/uuid.h>
263b6c88 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 34#include <wrapper/random.h>
35#include <wrapper/tracepoint.h>
36#include <wrapper/list.h>
cbc19040 37#include <wrapper/types.h>
2df37e95
MD		 38#include <lttng/kernel-version.h>
39#include <lttng/events.h>
92bc1e23 40#include <lttng/events-internal.h>
0b365677 41#include <lttng/lttng-bytecode.h>
2df37e95 42#include <lttng/tracer.h>
21f58fb7 43#include <lttng/event-notifier-notification.h>
2df37e95
MD		 44#include <lttng/abi-old.h>
45#include <lttng/endian.h>
46#include <lttng/string-utils.h>
4a11ef1c 47#include <lttng/utils.h>
24591303
MD		 48#include <ringbuffer/backend.h>
49#include <ringbuffer/frontend.h>
3636085f 50#include <wrapper/time.h>
4e3c1b9b 51
d83004aa
JD		 52#define METADATA_CACHE_DEFAULT_SIZE 4096
53
4e3c1b9b 54static LIST_HEAD(sessions);
750b05f2 55static LIST_HEAD(event_notifier_groups);
a90917c3 56static LIST_HEAD(lttng_transport_list);
a101fa10 57static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 58/*
59 * Protect the sessions and metadata caches.
60 */
4e3c1b9b 61static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 62static struct kmem_cache *event_recorder_cache;
63static struct kmem_cache *event_recorder_private_cache;
dffef45d 64static struct kmem_cache *event_notifier_cache;
a67ba386 65static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 66
8cdc1a81
MD		 67static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
68static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
dffef45d 69static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
b01155ba 70static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
3c997079 71
0648898e 72static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
f7d06400 73static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
a67ba386
MD		 74static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event);
75static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier);
c099397a 76static
8cdc1a81 77int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 78 struct lttng_kernel_channel_buffer *chan,
a67ba386 79 struct lttng_kernel_event_recorder *event);
c099397a 80static
8cdc1a81 81int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 82static
83void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 84static
8cdc1a81 85int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 86 const struct lttng_kernel_type_common *type,
87 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 88 size_t nesting);
89static
8cdc1a81 90int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 91 const struct lttng_kernel_event_field *field,
51ef4536 92 size_t nesting, const char **prev_field_name_p);
c099397a 93
c099397a 94void synchronize_trace(void)
abcca994 95{
05355f0b
MJ		 96#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
97 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 98 synchronize_rcu();
99#else
abcca994 100 synchronize_sched();
92da05ce
MJ		 101#endif
102
5f4c791e 103#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 104#ifdef CONFIG_PREEMPT_RT_FULL
105 synchronize_rcu();
106#endif
5f4c791e 107#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 108#ifdef CONFIG_PREEMPT_RT
109 synchronize_rcu();
110#endif
5f4c791e 111#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 112}
113
3c997079
MD		 114void lttng_lock_sessions(void)
115{
116 mutex_lock(&sessions_mutex);
117}
118
119void lttng_unlock_sessions(void)
120{
121 mutex_unlock(&sessions_mutex);
122}
123
9fe593d2
FD		 124static struct lttng_transport *lttng_transport_find(const char *name)
125{
126 struct lttng_transport *transport;
127
128 list_for_each_entry(transport, &lttng_transport_list, node) {
129 if (!strcmp(transport->name, name))
130 return transport;
131 }
132 return NULL;
133}
134
3c997079
MD		 135/*
136 * Called with sessions lock held.
137 */
138int lttng_session_active(void)
139{
8cdc1a81 140 struct lttng_kernel_session_private *iter;
3c997079
MD		 141
142 list_for_each_entry(iter, &sessions, list) {
8cdc1a81 143 if (iter->pub->active)
3c997079
MD		 144 return 1;
145 }
146 return 0;
147}
148
8cdc1a81 149struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 150{
8cdc1a81
MD		 151 struct lttng_kernel_session *session;
152 struct lttng_kernel_session_private *session_priv;
d83004aa 153 struct lttng_metadata_cache *metadata_cache;
3c997079 154 int i;
4e3c1b9b
MD		 155
156 mutex_lock(&sessions_mutex);
8cdc1a81 157 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 158 if (!session)
d83004aa 159 goto err;
8cdc1a81
MD		 160 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
161 if (!session_priv)
162 goto err_free_session;
163 session->priv = session_priv;
164 session_priv->pub = session;
165
166 INIT_LIST_HEAD(&session_priv->chan);
167 INIT_LIST_HEAD(&session_priv->events);
168 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 169
170 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
171 GFP_KERNEL);
172 if (!metadata_cache)
8cdc1a81 173 goto err_free_session_private;
0ca42eb7 174 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 175 if (!metadata_cache->data)
176 goto err_free_cache;
177 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
178 kref_init(&metadata_cache->refcount);
92d9f5e6 179 mutex_init(&metadata_cache->lock);
8cdc1a81 180 session_priv->metadata_cache = metadata_cache;
d83004aa 181 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
8cdc1a81 182 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 183 sizeof(metadata_cache->uuid));
8cdc1a81 184 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 185 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
8cdc1a81
MD		 186 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
187 list_add(&session_priv->list, &sessions);
188
8c0393c3
MD		 189 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
190 goto tracker_alloc_error;
191 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
192 goto tracker_alloc_error;
193 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
194 goto tracker_alloc_error;
195 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
196 goto tracker_alloc_error;
197 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
198 goto tracker_alloc_error;
199 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
200 goto tracker_alloc_error;
201
4e3c1b9b 202 mutex_unlock(&sessions_mutex);
8cdc1a81 203
4e3c1b9b 204 return session;
d83004aa 205
8c0393c3
MD		 206tracker_alloc_error:
207 lttng_id_tracker_fini(&session->pid_tracker);
208 lttng_id_tracker_fini(&session->vpid_tracker);
209 lttng_id_tracker_fini(&session->uid_tracker);
210 lttng_id_tracker_fini(&session->vuid_tracker);
211 lttng_id_tracker_fini(&session->gid_tracker);
212 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 213err_free_cache:
214 kfree(metadata_cache);
8cdc1a81
MD		 215err_free_session_private:
216 lttng_kvfree(session_priv);
d83004aa 217err_free_session:
48f5e0b5 218 lttng_kvfree(session);
d83004aa
JD		 219err:
220 mutex_unlock(&sessions_mutex);
221 return NULL;
222}
223
99f52fcc
FD		 224static
225struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
226{
227 struct lttng_counter_transport *transport;
228
229 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
230 if (!strcmp(transport->name, name))
231 return transport;
232 }
233 return NULL;
234}
235
236struct lttng_counter *lttng_kernel_counter_create(
237 const char *counter_transport_name,
238 size_t number_dimensions, const size_t *dimensions_sizes)
239{
240 struct lttng_counter *counter = NULL;
241 struct lttng_counter_transport *counter_transport = NULL;
242
243 counter_transport = lttng_counter_transport_find(counter_transport_name);
244 if (!counter_transport) {
245 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
246 counter_transport_name);
247 goto notransport;
248 }
249 if (!try_module_get(counter_transport->owner)) {
250 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
251 goto notransport;
252 }
253
254 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
255 if (!counter)
256 goto nomem;
257
258 /* Create event notifier error counter. */
259 counter->ops = &counter_transport->ops;
260 counter->transport = counter_transport;
261
262 counter->counter = counter->ops->counter_create(
263 number_dimensions, dimensions_sizes, 0);
264 if (!counter->counter) {
265 goto create_error;
266 }
267
268 return counter;
269
270create_error:
271 lttng_kvfree(counter);
272nomem:
273 if (counter_transport)
274 module_put(counter_transport->owner);
275notransport:
276 return NULL;
277}
278
750b05f2
FD		 279struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
280{
281 struct lttng_transport *transport = NULL;
282 struct lttng_event_notifier_group *event_notifier_group;
283 const char *transport_name = "relay-event-notifier";
284 size_t subbuf_size = 4096; //TODO
285 size_t num_subbuf = 16; //TODO
286 unsigned int switch_timer_interval = 0;
287 unsigned int read_timer_interval = 0;
dffef45d 288 int i;
750b05f2
FD		 289
290 mutex_lock(&sessions_mutex);
291
292 transport = lttng_transport_find(transport_name);
293 if (!transport) {
294 printk(KERN_WARNING "LTTng: transport %s not found\n",
295 transport_name);
296 goto notransport;
297 }
298 if (!try_module_get(transport->owner)) {
299 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
300 transport_name);
301 goto notransport;
302 }
303
304 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
305 GFP_KERNEL);
306 if (!event_notifier_group)
307 goto nomem;
308
309 /*
310 * Initialize the ring buffer used to store event notifier
311 * notifications.
312 */
313 event_notifier_group->ops = &transport->ops;
4a399b76 314 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 315 transport_name, event_notifier_group, NULL,
316 subbuf_size, num_subbuf, switch_timer_interval,
317 read_timer_interval);
318 if (!event_notifier_group->chan)
319 goto create_error;
320
321 event_notifier_group->transport = transport;
dffef45d
FD		 322
323 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
324 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
325 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
326 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
327
750b05f2
FD		 328 list_add(&event_notifier_group->node, &event_notifier_groups);
329
330 mutex_unlock(&sessions_mutex);
331
332 return event_notifier_group;
333
334create_error:
335 lttng_kvfree(event_notifier_group);
336nomem:
337 if (transport)
338 module_put(transport->owner);
339notransport:
340 mutex_unlock(&sessions_mutex);
341 return NULL;
342}
343
d83004aa
JD		 344void metadata_cache_destroy(struct kref *kref)
345{
346 struct lttng_metadata_cache *cache =
347 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 348 vfree(cache->data);
d83004aa 349 kfree(cache);
4e3c1b9b
MD		 350}
351
8cdc1a81 352void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 353{
f7d06400 354 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 355 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 356 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 357 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 358 int ret;
4e3c1b9b
MD		 359
360 mutex_lock(&sessions_mutex);
a8f2d0c7 361 WRITE_ONCE(session->active, 0);
f7d06400
MD		 362 list_for_each_entry(chan_priv, &session->priv->chan, node) {
363 ret = lttng_syscalls_unregister_channel(chan_priv->pub);
1ec65de1
MD		 364 WARN_ON(ret);
365 }
8cdc1a81 366 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 367 ret = _lttng_event_unregister(event_recorder_priv->pub);
dda6a249
MD		 368 WARN_ON(ret);
369 }
abcca994 370 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400
MD		 371 list_for_each_entry(chan_priv, &session->priv->chan, node) {
372 ret = lttng_syscalls_destroy_event(chan_priv->pub);
badfe9f5
MD		 373 WARN_ON(ret);
374 }
b2bc0bc8 375 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
8cdc1a81 376 &session->priv->enablers_head, node)
b2bc0bc8 377 lttng_event_enabler_destroy(event_enabler);
8cdc1a81 378 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, 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{
dffef45d 404 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_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
3b82c4e1 413 ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group);
8a8ac9a8
FD		 414 WARN_ON(ret);
415
a67ba386
MD		 416 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
417 &event_notifier_group->event_notifiers_head, node) {
418 ret = _lttng_event_notifier_unregister(event_notifier_priv->pub);
dffef45d
FD		 419 WARN_ON(ret);
420 }
421
b01155ba
FD		 422 /* Wait for in-flight event notifier to complete */
423 synchronize_trace();
424
21f58fb7
FD		 425 irq_work_sync(&event_notifier_group->wakeup_pending);
426
8a8ac9a8
FD		 427 kfree(event_notifier_group->sc_filter);
428
dffef45d
FD		 429 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
430 &event_notifier_group->enablers_head, node)
431 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
432
a67ba386
MD		 433 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
434 &event_notifier_group->event_notifiers_head, node)
0648898e 435 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 436
99f52fcc
FD		 437 if (event_notifier_group->error_counter) {
438 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 439
99f52fcc
FD		 440 error_counter->ops->counter_destroy(error_counter->counter);
441 module_put(error_counter->transport->owner);
442 lttng_kvfree(error_counter);
443 event_notifier_group->error_counter = NULL;
444 }
445
4a399b76 446 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 447 module_put(event_notifier_group->transport->owner);
448 list_del(&event_notifier_group->node);
dffef45d 449
750b05f2
FD		 450 mutex_unlock(&sessions_mutex);
451 lttng_kvfree(event_notifier_group);
452}
453
8cdc1a81 454int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 455{
456 int ret;
457
458 mutex_lock(&sessions_mutex);
459 ret = lttng_statedump_start(session);
460 mutex_unlock(&sessions_mutex);
461 return ret;
462}
463
8cdc1a81 464int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 465{
466 int ret = 0;
f7d06400 467 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 468
469 mutex_lock(&sessions_mutex);
470 if (session->active) {
471 ret = -EBUSY;
472 goto end;
473 }
c099397a 474
3c997079 475 /* Set transient enabler state to "enabled" */
8cdc1a81 476 session->priv->tstate = 1;
3c997079 477
4ef81e4a 478 /* We need to sync enablers with session before activation. */
b2bc0bc8 479 lttng_session_sync_event_enablers(session);
4ef81e4a 480
c099397a
MD		 481 /*
482 * Snapshot the number of events per channel to know the type of header
483 * we need to use.
484 */
f7d06400
MD		 485 list_for_each_entry(chan_priv, &session->priv->chan, node) {
486 if (chan_priv->header_type)
487 continue; /* don't change it if session stop/restart */
488 if (chan_priv->free_event_id < 31)
489 chan_priv->header_type = 1; /* compact */
c099397a 490 else
f7d06400 491 chan_priv->header_type = 2; /* large */
c099397a
MD		 492 }
493
64af2437 494 /* Clear each stream's quiescent state. */
f7d06400
MD		 495 list_for_each_entry(chan_priv, &session->priv->chan, node) {
496 if (chan_priv->channel_type != METADATA_CHANNEL)
497 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 498 }
64af2437 499
a8f2d0c7 500 WRITE_ONCE(session->active, 1);
8cdc1a81 501 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 502 ret = _lttng_session_metadata_statedump(session);
c337ddc2 503 if (ret) {
a8f2d0c7 504 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 505 goto end;
506 }
507 ret = lttng_statedump_start(session);
360f38ea 508 if (ret)
a8f2d0c7 509 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 510end:
511 mutex_unlock(&sessions_mutex);
11b5a3c2 512 return ret;
c0e31d2e
MD		 513}
514
8cdc1a81 515int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 516{
517 int ret = 0;
f7d06400 518 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 519
520 mutex_lock(&sessions_mutex);
521 if (!session->active) {
522 ret = -EBUSY;
523 goto end;
524 }
a8f2d0c7 525 WRITE_ONCE(session->active, 0);
3c997079
MD		 526
527 /* Set transient enabler state to "disabled" */
8cdc1a81 528 session->priv->tstate = 0;
b2bc0bc8 529 lttng_session_sync_event_enablers(session);
64af2437
MD		 530
531 /* Set each stream's quiescent state. */
f7d06400
MD		 532 list_for_each_entry(chan_priv, &session->priv->chan, node) {
533 if (chan_priv->channel_type != METADATA_CHANNEL)
534 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 535 }
c0e31d2e
MD		 536end:
537 mutex_unlock(&sessions_mutex);
11b5a3c2 538 return ret;
c0e31d2e
MD		 539}
540
8cdc1a81 541int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 542{
543 int ret = 0;
f7d06400 544 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 545 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 546 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 547 struct lttng_metadata_stream *stream;
548
549 mutex_lock(&sessions_mutex);
550 if (!session->active) {
551 ret = -EBUSY;
552 goto end;
553 }
554
555 mutex_lock(&cache->lock);
556 memset(cache->data, 0, cache->cache_alloc);
557 cache->metadata_written = 0;
558 cache->version++;
8cdc1a81 559 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 560 stream->metadata_out = 0;
561 stream->metadata_in = 0;
562 }
563 mutex_unlock(&cache->lock);
564
8cdc1a81 565 session->priv->metadata_dumped = 0;
f7d06400
MD		 566 list_for_each_entry(chan_priv, &session->priv->chan, node) {
567 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 568 }
569
8cdc1a81 570 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 571 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 572 }
573
574 ret = _lttng_session_metadata_statedump(session);
575
576end:
577 mutex_unlock(&sessions_mutex);
578 return ret;
579}
580
f7d06400 581int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel)
e64957da 582{
3c997079 583 int ret = 0;
e64957da 584
3c997079 585 mutex_lock(&sessions_mutex);
f7d06400 586 if (channel->priv->channel_type == METADATA_CHANNEL) {
3c997079
MD		 587 ret = -EPERM;
588 goto end;
589 }
f7d06400 590 if (channel->parent.enabled) {
3c997079
MD		 591 ret = -EEXIST;
592 goto end;
593 }
594 /* Set transient enabler state to "enabled" */
f7d06400
MD		 595 channel->priv->parent.tstate = 1;
596 lttng_session_sync_event_enablers(channel->parent.session);
3c997079 597 /* Set atomically the state to "enabled" */
f7d06400 598 WRITE_ONCE(channel->parent.enabled, 1);
3c997079
MD		 599end:
600 mutex_unlock(&sessions_mutex);
601 return ret;
e64957da
MD		 602}
603
f7d06400 604int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel)
e64957da 605{
3c997079 606 int ret = 0;
e64957da 607
3c997079 608 mutex_lock(&sessions_mutex);
f7d06400 609 if (channel->priv->channel_type == METADATA_CHANNEL) {
3c997079
MD		 610 ret = -EPERM;
611 goto end;
612 }
f7d06400 613 if (!channel->parent.enabled) {
3c997079
MD		 614 ret = -EEXIST;
615 goto end;
616 }
617 /* Set atomically the state to "disabled" */
f7d06400 618 WRITE_ONCE(channel->parent.enabled, 0);
3c997079 619 /* Set transient enabler state to "enabled" */
f7d06400
MD		 620 channel->priv->parent.tstate = 0;
621 lttng_session_sync_event_enablers(channel->parent.session);
3c997079
MD		 622end:
623 mutex_unlock(&sessions_mutex);
624 return ret;
e64957da
MD		 625}
626
9d993668 627int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 628{
3c997079 629 int ret = 0;
e64957da 630
3c997079 631 mutex_lock(&sessions_mutex);
9d993668
MD		 632 switch (event->type) {
633 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
634 {
635 struct lttng_kernel_event_recorder *event_recorder =
636 container_of(event, struct lttng_kernel_event_recorder, parent);
637
f7d06400 638 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 639 ret = -EPERM;
640 goto end;
641 }
a0493bef 642 break;
9d993668
MD		 643 }
644 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
645 switch (event->priv->instrumentation) {
646 case LTTNG_KERNEL_ABI_KRETPROBE:
647 ret = -EINVAL;
648 goto end;
649 default:
650 break;
651 }
a0493bef
MD		 652 break;
653 default:
9d993668 654 break;
a0493bef 655 }
e64957da 656
9d993668 657 if (event->enabled) {
3c997079
MD		 658 ret = -EEXIST;
659 goto end;
660 }
a67ba386 661 switch (event->priv->instrumentation) {
c190d76e
MJ		 662 case LTTNG_KERNEL_ABI_TRACEPOINT:
663 lttng_fallthrough;
606828e4 664 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 665 ret = -EINVAL;
666 break;
b4a75708 667
c190d76e
MJ		 668 case LTTNG_KERNEL_ABI_KPROBE:
669 lttng_fallthrough;
606828e4 670 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 671 WRITE_ONCE(event->enabled, 1);
a0493bef 672 break;
b4a75708 673
606828e4 674 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 675 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 676 break;
b4a75708 677
c190d76e
MJ		 678 case LTTNG_KERNEL_ABI_FUNCTION:
679 lttng_fallthrough;
680 case LTTNG_KERNEL_ABI_NOOP:
681 lttng_fallthrough;
a0493bef
MD		 682 default:
683 WARN_ON_ONCE(1);
684 ret = -EINVAL;
685 }
3c997079
MD		 686end:
687 mutex_unlock(&sessions_mutex);
688 return ret;
e64957da
MD		 689}
690
9d993668 691int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 692{
693 int ret = 0;
694
695 mutex_lock(&sessions_mutex);
9d993668
MD		 696 switch (event->type) {
697 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
698 {
699 struct lttng_kernel_event_recorder *event_recorder =
700 container_of(event, struct lttng_kernel_event_recorder, parent);
701
f7d06400 702 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 703 ret = -EPERM;
704 goto end;
705 }
b01155ba 706 break;
9d993668
MD		 707 }
708 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
709 switch (event->priv->instrumentation) {
710 case LTTNG_KERNEL_ABI_KRETPROBE:
711 ret = -EINVAL;
712 goto end;
713 default:
714 break;
715 }
2b16f0c9 716 break;
dffef45d 717 default:
9d993668 718 break;
dffef45d 719 }
dffef45d 720
a67ba386 721 if (!event->enabled) {
dffef45d
FD		 722 ret = -EEXIST;
723 goto end;
724 }
a67ba386 725 switch (event->priv->instrumentation) {
c190d76e
MJ		 726 case LTTNG_KERNEL_ABI_TRACEPOINT:
727 lttng_fallthrough;
606828e4 728 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 729 ret = -EINVAL;
730 break;
b4a75708 731
c190d76e
MJ		 732 case LTTNG_KERNEL_ABI_KPROBE:
733 lttng_fallthrough;
606828e4 734 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 735 WRITE_ONCE(event->enabled, 0);
2b16f0c9 736 break;
b4a75708 737
9d993668
MD		 738 case LTTNG_KERNEL_ABI_KRETPROBE:
739 ret = lttng_kretprobes_event_enable_state(event, 0);
740 break;
741
c190d76e
MJ		 742 case LTTNG_KERNEL_ABI_FUNCTION:
743 lttng_fallthrough;
744 case LTTNG_KERNEL_ABI_NOOP:
745 lttng_fallthrough;
dffef45d
FD		 746 default:
747 WARN_ON_ONCE(1);
748 ret = -EINVAL;
749 }
750end:
751 mutex_unlock(&sessions_mutex);
752 return ret;
753}
754
f7d06400 755struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 756 const char *transport_name,
757 void *buf_addr,
4e3c1b9b
MD		 758 size_t subbuf_size, size_t num_subbuf,
759 unsigned int switch_timer_interval,
d83004aa
JD		 760 unsigned int read_timer_interval,
761 enum channel_type channel_type)
4e3c1b9b 762{
f7d06400
MD		 763 struct lttng_kernel_channel_buffer *chan;
764 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 765 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 766
767 mutex_lock(&sessions_mutex);
8cdc1a81 768 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 769 goto active; /* Refuse to add channel to active session */
a90917c3 770 transport = lttng_transport_find(transport_name);
f3d01b96 771 if (!transport) {
5a15f70c 772 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 773 transport_name);
c0e31d2e 774 goto notransport;
f3d01b96 775 }
a33c9927 776 if (!try_module_get(transport->owner)) {
5a15f70c 777 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 778 goto notransport;
779 }
f7d06400 780 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 781 if (!chan)
c0e31d2e 782 goto nomem;
f7d06400
MD		 783 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
784 if (!chan_priv)
785 goto nomem_priv;
786 chan->priv = chan_priv;
787 chan_priv->pub = chan;
788 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
789 chan->parent.session = session;
790 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 791 chan->ops = &transport->ops;
125b4df4
MD		 792 /*
793 * Note: the channel creation op already writes into the packet
794 * headers. Therefore the "chan" information used as input
795 * should be already accessible.
796 */
f7d06400 797 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 798 chan, buf_addr, subbuf_size, num_subbuf,
799 switch_timer_interval, read_timer_interval);
f7d06400 800 if (!chan->priv->rb_chan)
f3d01b96 801 goto create_error;
f7d06400
MD		 802 chan->priv->parent.tstate = 1;
803 chan->parent.enabled = 1;
804 chan->priv->transport = transport;
805 chan->priv->channel_type = channel_type;
806 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 807 mutex_unlock(&sessions_mutex);
808 return chan;
809
f3d01b96 810create_error:
f7d06400
MD		 811 kfree(chan_priv);
812nomem_priv:
f3d01b96 813 kfree(chan);
c0e31d2e 814nomem:
a33c9927
MD		 815 if (transport)
816 module_put(transport->owner);
c0e31d2e 817notransport:
e5382b6d 818active:
4e3c1b9b
MD		 819 mutex_unlock(&sessions_mutex);
820 return NULL;
821}
822
823/*
d83004aa
JD		 824 * Only used internally at session destruction for per-cpu channels, and
825 * when metadata channel is released.
826 * Needs to be called with sessions mutex held.
4e3c1b9b 827 */
aa7c23a9 828static
f7d06400 829void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 830{
f7d06400
MD		 831 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
832 module_put(chan->priv->transport->owner);
833 list_del(&chan->priv->node);
834 lttng_kernel_destroy_context(chan->priv->ctx);
835 kfree(chan->priv);
4e3c1b9b
MD		 836 kfree(chan);
837}
838
f7d06400 839void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 840{
f7d06400 841 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 842
843 /* Protect the metadata cache with the sessions_mutex. */
844 mutex_lock(&sessions_mutex);
845 _lttng_channel_destroy(chan);
846 mutex_unlock(&sessions_mutex);
847}
848EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
849
850static
851void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
852{
853 stream->finalized = 1;
854 wake_up_interruptible(&stream->read_wait);
855}
856
a101fa10 857
e5382b6d
MD		 858/*
859 * Supports event creation while tracing session is active.
3c997079 860 * Needs to be called with sessions mutex held.
e5382b6d 861 */
def1e304
MD		 862struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_enabler *event_enabler,
863 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 864{
def1e304
MD		 865 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
866 struct lttng_kernel_abi_event *event_param = &event_enabler->base.event_param;
867 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
f7d06400 868 struct lttng_kernel_session *session = chan->parent.session;
a67ba386
MD		 869 struct lttng_kernel_event_recorder *event_recorder;
870 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 871 const char *event_name;
872 struct hlist_head *head;
3d084699 873 int ret;
4e3c1b9b 874
f7d06400 875 if (chan->priv->free_event_id == -1U) {
4cf0bf51 876 ret = -EMFILE;
e5382b6d 877 goto full;
abc0446a 878 }
3c997079
MD		 879
880 switch (itype) {
606828e4 881 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 882 event_name = event_desc->event_name;
3c997079 883 break;
b4a75708 884
c190d76e
MJ		 885 case LTTNG_KERNEL_ABI_KPROBE:
886 lttng_fallthrough;
887 case LTTNG_KERNEL_ABI_UPROBE:
888 lttng_fallthrough;
889 case LTTNG_KERNEL_ABI_KRETPROBE:
890 lttng_fallthrough;
606828e4 891 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 892 event_name = event_param->name;
893 break;
b4a75708 894
c190d76e
MJ		 895 case LTTNG_KERNEL_ABI_FUNCTION:
896 lttng_fallthrough;
897 case LTTNG_KERNEL_ABI_NOOP:
898 lttng_fallthrough;
3c997079
MD		 899 default:
900 WARN_ON_ONCE(1);
901 ret = -EINVAL;
902 goto type_error;
903 }
4a11ef1c 904
8cdc1a81 905 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
4a11ef1c 906 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 907 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
908 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
909 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 910 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 911 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 912 ret = -EEXIST;
913 goto exist;
abc0446a
MD		 914 }
915 }
3c997079 916
a67ba386
MD		 917 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
918 if (!event_recorder) {
4cf0bf51 919 ret = -ENOMEM;
4e3c1b9b 920 goto cache_error;
abc0446a 921 }
a67ba386
MD		 922 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
923 if (!event_recorder_priv) {
924 ret = -ENOMEM;
925 goto cache_private_error;
926 }
927 event_recorder_priv->pub = event_recorder;
928 event_recorder_priv->parent.pub = &event_recorder->parent;
929 event_recorder->priv = event_recorder_priv;
930 event_recorder->parent.priv = &event_recorder_priv->parent;
931 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
932
8a445457 933 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 934 event_recorder->chan = chan;
f7d06400 935 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 936 event_recorder->priv->parent.instrumentation = itype;
937 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
938 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 939
940 switch (itype) {
606828e4 941 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 942 /* Event will be enabled by enabler sync. */
a67ba386
MD		 943 event_recorder->parent.enabled = 0;
944 event_recorder->priv->parent.registered = 0;
945 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
946 if (!event_recorder->priv->parent.desc) {
4cf0bf51 947 ret = -ENOENT;
d3dbe23c 948 goto register_error;
abc0446a 949 }
3c997079
MD		 950 /* Populate lttng_event structure before event registration. */
951 smp_wmb();
baf20995 952 break;
b4a75708 953
606828e4 954 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 955 /*
956 * Needs to be explicitly enabled after creation, since
957 * we may want to apply filters.
958 */
a67ba386
MD		 959 event_recorder->parent.enabled = 0;
960 event_recorder->priv->parent.registered = 1;
3c997079
MD		 961 /*
962 * Populate lttng_event structure before event
963 * registration.
964 */
965 smp_wmb();
8bf17deb 966 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 967 event_param->u.kprobe.symbol_name,
968 event_param->u.kprobe.offset,
969 event_param->u.kprobe.addr,
a67ba386 970 event_recorder);
abc0446a 971 if (ret) {
4cf0bf51 972 ret = -EINVAL;
d6d808f3 973 goto register_error;
abc0446a 974 }
a67ba386 975 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 976 WARN_ON_ONCE(!ret);
d6d808f3 977 break;
b4a75708 978
606828e4 979 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 980 {
a67ba386
MD		 981 struct lttng_kernel_event_recorder *event_recorder_return;
982 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 983
984 /* kretprobe defines 2 events */
a0493bef
MD		 985 /*
986 * Needs to be explicitly enabled after creation, since
987 * we may want to apply filters.
988 */
a67ba386
MD		 989 event_recorder->parent.enabled = 0;
990 event_recorder->priv->parent.registered = 1;
991
992 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
993 if (!event_recorder_return) {
994 ret = -ENOMEM;
995 goto register_error;
996 }
997 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
998 if (!event_recorder_return_priv) {
999 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1000 ret = -ENOMEM;
7371f44c 1001 goto register_error;
abc0446a 1002 }
a67ba386
MD		 1003 event_recorder_return_priv->pub = event_recorder_return;
1004 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1005 event_recorder_return->priv = event_recorder_return_priv;
1006 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1007 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1008
8a445457 1009 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 1010 event_recorder_return->chan = chan;
f7d06400 1011 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 1012 event_recorder_return->priv->parent.instrumentation = itype;
1013 event_recorder_return->parent.enabled = 0;
1014 event_recorder_return->priv->parent.registered = 1;
1015 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1016 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1017 /*
a90917c3 1018 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1019 */
1020 smp_wmb();
3c997079 1021 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1022 event_param->u.kretprobe.symbol_name,
1023 event_param->u.kretprobe.offset,
1024 event_param->u.kretprobe.addr,
a67ba386 1025 event_recorder, event_recorder_return);
7371f44c 1026 if (ret) {
a67ba386
MD		 1027 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1028 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1029 ret = -EINVAL;
7371f44c
MD		 1030 goto register_error;
1031 }
1032 /* Take 2 refs on the module: one per event. */
a67ba386 1033 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1034 WARN_ON_ONCE(!ret);
a67ba386 1035 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1036 WARN_ON_ONCE(!ret);
f7d06400 1037 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1038 event_recorder_return);
abc0446a 1039 WARN_ON_ONCE(ret > 0);
7371f44c 1040 if (ret) {
a67ba386
MD		 1041 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1042 kmem_cache_free(event_recorder_cache, event_recorder_return);
1043 module_put(event_recorder_return->priv->parent.desc->owner);
1044 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1045 goto statedump_error;
1046 }
f7d06400 1047 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
7371f44c
MD		 1048 break;
1049 }
b4a75708 1050
606828e4 1051 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1052 /*
1053 * Needs to be explicitly enabled after creation, since
1054 * we may want to apply filters.
1055 */
a67ba386
MD		 1056 event_recorder->parent.enabled = 0;
1057 event_recorder->priv->parent.registered = 0;
1058 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1059 switch (event_param->u.syscall.entryexit) {
606828e4 1060 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1061 ret = -EINVAL;
1062 goto register_error;
606828e4 1063 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1064 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1065 break;
606828e4 1066 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1067 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1068 break;
1069 }
1070 switch (event_param->u.syscall.abi) {
606828e4 1071 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1072 ret = -EINVAL;
1073 goto register_error;
606828e4 1074 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1075 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1076 break;
606828e4 1077 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1078 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1079 break;
1080 }
a67ba386 1081 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1082 ret = -EINVAL;
259b6cb3 1083 goto register_error;
abc0446a 1084 }
1ec65de1 1085 break;
b4a75708 1086
606828e4 1087 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1088 /*
1089 * Needs to be explicitly enabled after creation, since
1090 * we may want to apply filters.
1091 */
a67ba386
MD		 1092 event_recorder->parent.enabled = 0;
1093 event_recorder->priv->parent.registered = 1;
3aed4dca 1094
a344f64b
FD		 1095 /*
1096 * Populate lttng_event structure before event
1097 * registration.
1098 */
1099 smp_wmb();
149b9a9d 1100
83b802dc 1101 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1102 event_param->u.uprobe.fd,
a67ba386 1103 event_recorder);
149b9a9d
YB		 1104 if (ret)
1105 goto register_error;
a67ba386 1106 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1107 WARN_ON_ONCE(!ret);
1108 break;
b4a75708 1109
c190d76e
MJ		 1110 case LTTNG_KERNEL_ABI_FUNCTION:
1111 lttng_fallthrough;
1112 case LTTNG_KERNEL_ABI_NOOP:
1113 lttng_fallthrough;
baf20995
MD		 1114 default:
1115 WARN_ON_ONCE(1);
4cf0bf51 1116 ret = -EINVAL;
df07930b 1117 goto register_error;
baf20995 1118 }
f7d06400 1119 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1120 WARN_ON_ONCE(ret > 0);
1121 if (ret) {
c099397a 1122 goto statedump_error;
abc0446a 1123 }
a67ba386 1124 hlist_add_head(&event_recorder->priv->hlist, head);
f7d06400 1125 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
a67ba386 1126 return event_recorder;
4e3c1b9b 1127
c099397a 1128statedump_error:
259b6cb3 1129 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1130register_error:
a67ba386
MD		 1131 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1132cache_private_error:
1133 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1134cache_error:
1135exist:
3c997079 1136type_error:
e5382b6d 1137full:
4cf0bf51 1138 return ERR_PTR(ret);
4e3c1b9b
MD		 1139}
1140
a67ba386 1141struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1142 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1143 uint64_t token, uint64_t error_counter_index,
1144 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1145 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1146 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1147{
a67ba386
MD		 1148 struct lttng_kernel_event_notifier *event_notifier;
1149 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1150 struct lttng_counter *error_counter;
dffef45d
FD		 1151 const char *event_name;
1152 struct hlist_head *head;
1153 int ret;
1154
1155 switch (itype) {
606828e4 1156 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1157 event_name = event_desc->event_name;
b01155ba 1158 break;
b4a75708 1159
c190d76e
MJ		 1160 case LTTNG_KERNEL_ABI_KPROBE:
1161 lttng_fallthrough;
1162 case LTTNG_KERNEL_ABI_UPROBE:
1163 lttng_fallthrough;
606828e4 1164 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1165 event_name = event_notifier_param->event.name;
1166 break;
b4a75708 1167
c190d76e
MJ		 1168 case LTTNG_KERNEL_ABI_KRETPROBE:
1169 lttng_fallthrough;
1170 case LTTNG_KERNEL_ABI_FUNCTION:
1171 lttng_fallthrough;
1172 case LTTNG_KERNEL_ABI_NOOP:
1173 lttng_fallthrough;
dffef45d
FD		 1174 default:
1175 WARN_ON_ONCE(1);
1176 ret = -EINVAL;
1177 goto type_error;
1178 }
1179
1180 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1181 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1182 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1183 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1184 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1185 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1186 && event_notifier_group == event_notifier_priv->group
1187 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1188 ret = -EEXIST;
1189 goto exist;
1190 }
1191 }
1192
1193 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1194 if (!event_notifier) {
1195 ret = -ENOMEM;
1196 goto cache_error;
1197 }
a67ba386
MD		 1198 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1199 if (!event_notifier_priv) {
1200 ret = -ENOMEM;
1201 goto cache_private_error;
1202 }
1203 event_notifier_priv->pub = event_notifier;
1204 event_notifier_priv->parent.pub = &event_notifier->parent;
1205 event_notifier->priv = event_notifier_priv;
1206 event_notifier->parent.priv = &event_notifier_priv->parent;
1207 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1208
1209 event_notifier->priv->group = event_notifier_group;
1210 event_notifier->priv->parent.user_token = token;
1211 event_notifier->priv->error_counter_index = error_counter_index;
1212 event_notifier->priv->num_captures = 0;
1213 event_notifier->priv->parent.instrumentation = itype;
1214 event_notifier->notification_send = lttng_event_notifier_notification_send;
1215 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1216 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1217 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1218 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1219
1220 switch (itype) {
606828e4 1221 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1222 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1223 event_notifier->parent.enabled = 0;
1224 event_notifier->priv->parent.registered = 0;
1225 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1226 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1227 ret = -ENOENT;
1228 goto register_error;
1229 }
1230 /* Populate lttng_event_notifier structure before event registration. */
1231 smp_wmb();
1232 break;
b4a75708 1233
606828e4 1234 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1235 /*
1236 * Needs to be explicitly enabled after creation, since
1237 * we may want to apply filters.
1238 */
a67ba386
MD		 1239 event_notifier->parent.enabled = 0;
1240 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1241 /*
1242 * Populate lttng_event_notifier structure before event
1243 * registration.
1244 */
1245 smp_wmb();
1246 ret = lttng_kprobes_register_event_notifier(
1247 event_notifier_param->event.u.kprobe.symbol_name,
1248 event_notifier_param->event.u.kprobe.offset,
1249 event_notifier_param->event.u.kprobe.addr,
1250 event_notifier);
1251 if (ret) {
1252 ret = -EINVAL;
1253 goto register_error;
1254 }
a67ba386 1255 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1256 WARN_ON_ONCE(!ret);
1257 break;
b4a75708 1258
606828e4 1259 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1260 /*
1261 * Needs to be explicitly enabled after creation, since
1262 * we may want to apply filters.
1263 */
a67ba386
MD		 1264 event_notifier->parent.enabled = 0;
1265 event_notifier->priv->parent.registered = 0;
1266 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1267 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1268 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1269 ret = -EINVAL;
1270 goto register_error;
606828e4 1271 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1272 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1273 break;
606828e4 1274 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1275 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1276 break;
1277 }
1278 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1279 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1280 ret = -EINVAL;
1281 goto register_error;
606828e4 1282 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1283 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1284 break;
606828e4 1285 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1286 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1287 break;
1288 }
1289
a67ba386 1290 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1291 ret = -EINVAL;
1292 goto register_error;
1293 }
1294 break;
b4a75708 1295
606828e4 1296 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1297 /*
1298 * Needs to be explicitly enabled after creation, since
1299 * we may want to apply filters.
1300 */
a67ba386
MD		 1301 event_notifier->parent.enabled = 0;
1302 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1303
1304 /*
1305 * Populate lttng_event_notifier structure before
1306 * event_notifier registration.
1307 */
1308 smp_wmb();
1309
1310 ret = lttng_uprobes_register_event_notifier(
1311 event_notifier_param->event.name,
1312 event_notifier_param->event.u.uprobe.fd,
1313 event_notifier);
1314 if (ret)
1315 goto register_error;
a67ba386 1316 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1317 WARN_ON_ONCE(!ret);
1318 break;
b4a75708 1319
c190d76e
MJ		 1320 case LTTNG_KERNEL_ABI_KRETPROBE:
1321 lttng_fallthrough;
1322 case LTTNG_KERNEL_ABI_FUNCTION:
1323 lttng_fallthrough;
1324 case LTTNG_KERNEL_ABI_NOOP:
1325 lttng_fallthrough;
dffef45d
FD		 1326 default:
1327 WARN_ON_ONCE(1);
1328 ret = -EINVAL;
1329 goto register_error;
1330 }
1331
a67ba386
MD		 1332 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1333 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1334
1335 /*
1336 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1337 * bucket is currently in use. We trust it. The session lock
1338 * synchronizes against concurrent creation of the error
1339 * counter.
99f52fcc 1340 */
ab04d7b1
MD		 1341 error_counter = event_notifier_group->error_counter;
1342 if (error_counter) {
99f52fcc
FD		 1343 size_t dimension_index[1];
1344
1345 /*
1346 * Check that the index is within the boundary of the counter.
1347 */
a67ba386 1348 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1349 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1350 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1351 ret = -EINVAL;
1352 goto register_error;
1353 }
1354
a67ba386 1355 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1356 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1357 if (ret) {
1358 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1359 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1360 goto register_error;
1361 }
1362 }
1363
dffef45d
FD		 1364 return event_notifier;
1365
1366register_error:
a67ba386
MD		 1367 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1368cache_private_error:
dffef45d
FD		 1369 kmem_cache_free(event_notifier_cache, event_notifier);
1370cache_error:
1371exist:
1372type_error:
1373 return ERR_PTR(ret);
1374}
1375
99f52fcc
FD		 1376int lttng_kernel_counter_read(struct lttng_counter *counter,
1377 const size_t *dim_indexes, int32_t cpu,
1378 int64_t *val, bool *overflow, bool *underflow)
1379{
1380 return counter->ops->counter_read(counter->counter, dim_indexes,
1381 cpu, val, overflow, underflow);
1382}
1383
1384int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1385 const size_t *dim_indexes, int64_t *val,
1386 bool *overflow, bool *underflow)
1387{
1388 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1389 val, overflow, underflow);
1390}
1391
1392int lttng_kernel_counter_clear(struct lttng_counter *counter,
1393 const size_t *dim_indexes)
1394{
1395 return counter->ops->counter_clear(counter->counter, dim_indexes);
1396}
1397
def1e304
MD		 1398struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_enabler *event_enabler,
1399 const struct lttng_kernel_event_desc *event_desc)
3c997079 1400{
a67ba386 1401 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1402
1403 mutex_lock(&sessions_mutex);
def1e304 1404 event = _lttng_kernel_event_recorder_create(event_enabler, event_desc);
3c997079
MD		 1405 mutex_unlock(&sessions_mutex);
1406 return event;
1407}
1408
a67ba386 1409struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1410 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1411 uint64_t id, uint64_t error_counter_index,
1412 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1413 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1414 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1415{
a67ba386 1416 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1417
1418 mutex_lock(&sessions_mutex);
1419 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1420 error_counter_index, event_notifier_group,
a67ba386 1421 event_notifier_param, itype);
dffef45d
FD		 1422 mutex_unlock(&sessions_mutex);
1423 return event_notifier;
1424}
1425
3c997079
MD		 1426/* Only used for tracepoints for now. */
1427static
a67ba386 1428void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1429{
437d5aa5 1430 const struct lttng_kernel_event_desc *desc;
f127e61e 1431 int ret = -EINVAL;
3c997079 1432
a67ba386 1433 if (event_recorder->priv->parent.registered)
3c997079 1434 return;
4ecb5ad5 1435
a67ba386
MD		 1436 desc = event_recorder->priv->parent.desc;
1437 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1438 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1439 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1440 desc->tp_class->probe_callback,
a67ba386 1441 event_recorder);
4ecb5ad5 1442 break;
b4a75708 1443
606828e4 1444 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1445 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1446 break;
b4a75708 1447
c190d76e
MJ		 1448 case LTTNG_KERNEL_ABI_KPROBE:
1449 lttng_fallthrough;
1450 case LTTNG_KERNEL_ABI_UPROBE:
1451 lttng_fallthrough;
606828e4 1452 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1453 ret = 0;
1454 break;
b4a75708 1455
c190d76e
MJ		 1456 case LTTNG_KERNEL_ABI_FUNCTION:
1457 lttng_fallthrough;
1458 case LTTNG_KERNEL_ABI_NOOP:
1459 lttng_fallthrough;
4ecb5ad5
MD		 1460 default:
1461 WARN_ON_ONCE(1);
1462 }
3c997079 1463 if (!ret)
a67ba386 1464 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1465}
1466
4e3c1b9b
MD		 1467/*
1468 * Only used internally at session destruction.
1469 */
a67ba386 1470int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1471{
a67ba386 1472 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1473 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1474 int ret = -EINVAL;
1475
a67ba386 1476 if (!event_priv->registered)
3c997079
MD		 1477 return 0;
1478
a67ba386
MD		 1479 desc = event_priv->desc;
1480 switch (event_priv->instrumentation) {
606828e4 1481 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1482 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1483 event_priv->desc->tp_class->probe_callback,
a67ba386 1484 event_recorder);
baf20995 1485 break;
b4a75708 1486
606828e4 1487 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1488 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1489 ret = 0;
1490 break;
b4a75708 1491
606828e4 1492 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1493 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1494 ret = 0;
1495 break;
b4a75708 1496
606828e4 1497 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1498 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1499 break;
b4a75708 1500
606828e4 1501 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1502 ret = 0;
1503 break;
b4a75708 1504
606828e4 1505 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1506 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1507 ret = 0;
1508 break;
b4a75708 1509
c190d76e
MJ		 1510 case LTTNG_KERNEL_ABI_FUNCTION:
1511 lttng_fallthrough;
baf20995
MD		 1512 default:
1513 WARN_ON_ONCE(1);
1514 }
3c997079 1515 if (!ret)
a67ba386 1516 event_priv->registered = 0;
dda6a249
MD		 1517 return ret;
1518}
1519
dffef45d
FD		 1520/* Only used for tracepoints for now. */
1521static
a67ba386 1522void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1523{
437d5aa5 1524 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1525 int ret = -EINVAL;
1526
a67ba386 1527 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1528 return;
1529
a67ba386
MD		 1530 desc = event_notifier->priv->parent.desc;
1531 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1532 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1533 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1534 desc->tp_class->probe_callback,
b01155ba
FD		 1535 event_notifier);
1536 break;
b4a75708 1537
606828e4 1538 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1539 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1540 break;
b4a75708 1541
c190d76e
MJ		 1542 case LTTNG_KERNEL_ABI_KPROBE:
1543 lttng_fallthrough;
606828e4 1544 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1545 ret = 0;
1546 break;
b4a75708 1547
c190d76e
MJ		 1548 case LTTNG_KERNEL_ABI_KRETPROBE:
1549 lttng_fallthrough;
1550 case LTTNG_KERNEL_ABI_FUNCTION:
1551 lttng_fallthrough;
1552 case LTTNG_KERNEL_ABI_NOOP:
1553 lttng_fallthrough;
dffef45d
FD		 1554 default:
1555 WARN_ON_ONCE(1);
1556 }
1557 if (!ret)
a67ba386 1558 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1559}
1560
1561static
1562int _lttng_event_notifier_unregister(
a67ba386 1563 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1564{
437d5aa5 1565 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1566 int ret = -EINVAL;
1567
a67ba386 1568 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1569 return 0;
1570
a67ba386
MD		 1571 desc = event_notifier->priv->parent.desc;
1572 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1573 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1574 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
6c8c025b 1575 event_notifier->priv->parent.desc->tp_class->probe_callback,
b01155ba
FD		 1576 event_notifier);
1577 break;
b4a75708 1578
606828e4 1579 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1580 lttng_kprobes_unregister_event_notifier(event_notifier);
1581 ret = 0;
1582 break;
b4a75708 1583
606828e4 1584 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1585 lttng_uprobes_unregister_event_notifier(event_notifier);
1586 ret = 0;
1587 break;
b4a75708 1588
606828e4 1589 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1590 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1591 break;
b4a75708 1592
c190d76e
MJ		 1593 case LTTNG_KERNEL_ABI_KRETPROBE:
1594 lttng_fallthrough;
1595 case LTTNG_KERNEL_ABI_FUNCTION:
1596 lttng_fallthrough;
1597 case LTTNG_KERNEL_ABI_NOOP:
1598 lttng_fallthrough;
dffef45d
FD		 1599 default:
1600 WARN_ON_ONCE(1);
1601 }
1602 if (!ret)
a67ba386 1603 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1604 return ret;
1605}
1606
dda6a249
MD		 1607/*
1608 * Only used internally at session destruction.
1609 */
be066e6c 1610static
0648898e 1611void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1612{
0648898e 1613 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1614 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1615
0648898e
MD		 1616 lttng_free_event_filter_runtime(event);
1617 /* Free event enabler refs */
1618 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1619 &event_priv->enablers_ref_head, node)
1620 kfree(enabler_ref);
b4a75708 1621
0648898e
MD		 1622 switch (event->type) {
1623 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1624 {
1625 struct lttng_kernel_event_recorder *event_recorder =
1626 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1627
0648898e
MD		 1628 switch (event_priv->instrumentation) {
1629 case LTTNG_KERNEL_ABI_TRACEPOINT:
1630 lttng_event_desc_put(event_priv->desc);
1631 break;
b4a75708 1632
0648898e
MD		 1633 case LTTNG_KERNEL_ABI_KPROBE:
1634 module_put(event_priv->desc->owner);
1635 lttng_kprobes_destroy_event_private(event_recorder);
1636 break;
b4a75708 1637
0648898e
MD		 1638 case LTTNG_KERNEL_ABI_KRETPROBE:
1639 module_put(event_priv->desc->owner);
1640 lttng_kretprobes_destroy_private(event_recorder);
1641 break;
b4a75708 1642
0648898e
MD		 1643 case LTTNG_KERNEL_ABI_SYSCALL:
1644 break;
4e3c1b9b 1645
0648898e
MD		 1646 case LTTNG_KERNEL_ABI_UPROBE:
1647 module_put(event_priv->desc->owner);
1648 lttng_uprobes_destroy_event_private(event_recorder);
1649 break;
3ef5cc03 1650
c190d76e
MJ		 1651 case LTTNG_KERNEL_ABI_FUNCTION:
1652 lttng_fallthrough;
1653 case LTTNG_KERNEL_ABI_NOOP:
1654 lttng_fallthrough;
0648898e
MD		 1655 default:
1656 WARN_ON_ONCE(1);
1657 }
1658 list_del(&event_recorder->priv->node);
1659 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1660 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1661 break;
0648898e
MD		 1662 }
1663 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1664 {
1665 struct lttng_kernel_event_notifier *event_notifier =
1666 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1667
0648898e
MD		 1668 switch (event_notifier->priv->parent.instrumentation) {
1669 case LTTNG_KERNEL_ABI_TRACEPOINT:
1670 lttng_event_desc_put(event_notifier->priv->parent.desc);
1671 break;
b4a75708 1672
0648898e
MD		 1673 case LTTNG_KERNEL_ABI_KPROBE:
1674 module_put(event_notifier->priv->parent.desc->owner);
1675 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1676 break;
b4a75708 1677
0648898e
MD		 1678 case LTTNG_KERNEL_ABI_SYSCALL:
1679 break;
b4a75708 1680
0648898e
MD		 1681 case LTTNG_KERNEL_ABI_UPROBE:
1682 module_put(event_notifier->priv->parent.desc->owner);
1683 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1684 break;
1685
c190d76e
MJ		 1686 case LTTNG_KERNEL_ABI_KRETPROBE:
1687 lttng_fallthrough;
1688 case LTTNG_KERNEL_ABI_FUNCTION:
1689 lttng_fallthrough;
1690 case LTTNG_KERNEL_ABI_NOOP:
1691 lttng_fallthrough;
0648898e
MD		 1692 default:
1693 WARN_ON_ONCE(1);
1694 }
1695 list_del(&event_notifier->priv->node);
1696 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1697 kmem_cache_free(event_notifier_cache, event_notifier);
1698 break;
1699 }
dffef45d
FD		 1700 default:
1701 WARN_ON_ONCE(1);
1702 }
dffef45d
FD		 1703}
1704
8c0393c3 1705struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1706 enum tracker_type tracker_type)
e0130fab 1707{
d1f652f8
MD		 1708 switch (tracker_type) {
1709 case TRACKER_PID:
1710 return &session->pid_tracker;
1711 case TRACKER_VPID:
1712 return &session->vpid_tracker;
1713 case TRACKER_UID:
1714 return &session->uid_tracker;
1715 case TRACKER_VUID:
1716 return &session->vuid_tracker;
1717 case TRACKER_GID:
1718 return &session->gid_tracker;
1719 case TRACKER_VGID:
1720 return &session->vgid_tracker;
1721 default:
1722 WARN_ON_ONCE(1);
1723 return NULL;
1724 }
1725}
1726
8cdc1a81 1727int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1728 enum tracker_type tracker_type, int id)
1729{
8c0393c3 1730 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1731 int ret;
1732
d1f652f8
MD		 1733 tracker = get_tracker(session, tracker_type);
1734 if (!tracker)
1735 return -EINVAL;
1736 if (id < -1)
e0130fab
MD		 1737 return -EINVAL;
1738 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1739 if (id == -1) {
1740 /* track all ids: destroy tracker. */
1741 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1742 ret = 0;
1743 } else {
d1f652f8 1744 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1745 }
e0130fab
MD		 1746 mutex_unlock(&sessions_mutex);
1747 return ret;
1748}
1749
8cdc1a81 1750int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1751 enum tracker_type tracker_type, int id)
e0130fab 1752{
8c0393c3 1753 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1754 int ret;
1755
d1f652f8
MD		 1756 tracker = get_tracker(session, tracker_type);
1757 if (!tracker)
1758 return -EINVAL;
1759 if (id < -1)
e0130fab
MD		 1760 return -EINVAL;
1761 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1762 if (id == -1) {
1763 /* untrack all ids: replace by empty tracker. */
1764 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1765 } else {
d1f652f8 1766 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1767 }
e0130fab
MD		 1768 mutex_unlock(&sessions_mutex);
1769 return ret;
1770}
1771
7e6f9ef6 1772static
d1f652f8 1773void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1774{
8c0393c3
MD		 1775 struct lttng_kernel_id_tracker *id_tracker = m->private;
1776 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1777 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1778 int iter = 0, i;
1779
1780 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1781 if (id_tracker_p) {
1782 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1783 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1784
f934e302 1785 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1786 if (iter++ >= *pos)
1787 return e;
1788 }
1789 }
1790 } else {
d1f652f8 1791 /* ID tracker disabled. */
7e6f9ef6 1792 if (iter >= *pos && iter == 0) {
d1f652f8 1793 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1794 }
1795 iter++;
1796 }
1797 /* End of list */
1798 return NULL;
1799}
1800
1801/* Called with sessions_mutex held. */
1802static
d1f652f8 1803void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1804{
8c0393c3
MD		 1805 struct lttng_kernel_id_tracker *id_tracker = m->private;
1806 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1807 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1808 int iter = 0, i;
1809
1810 (*ppos)++;
d1f652f8
MD		 1811 if (id_tracker_p) {
1812 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1813 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1814
f934e302 1815 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1816 if (iter++ >= *ppos)
1817 return e;
1818 }
1819 }
1820 } else {
d1f652f8 1821 /* ID tracker disabled. */
7e6f9ef6 1822 if (iter >= *ppos && iter == 0)
d1f652f8 1823 return p; /* empty tracker */
7e6f9ef6
MD		 1824 iter++;
1825 }
1826
1827 /* End of list */
1828 return NULL;
1829}
1830
1831static
d1f652f8 1832void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1833{
1834 mutex_unlock(&sessions_mutex);
1835}
1836
1837static
d1f652f8 1838int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1839{
8c0393c3
MD		 1840 struct lttng_kernel_id_tracker *id_tracker = m->private;
1841 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1842 int id;
7e6f9ef6 1843
d1f652f8 1844 if (p == id_tracker_p) {
7e6f9ef6 1845 /* Tracker disabled. */
d1f652f8 1846 id = -1;
7e6f9ef6 1847 } else {
d1f652f8 1848 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1849
d1f652f8
MD		 1850 id = lttng_id_tracker_get_node_id(e);
1851 }
8c0393c3 1852 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1853 case TRACKER_PID:
1854 seq_printf(m, "process { pid = %d; };\n", id);
1855 break;
1856 case TRACKER_VPID:
1857 seq_printf(m, "process { vpid = %d; };\n", id);
1858 break;
1859 case TRACKER_UID:
1860 seq_printf(m, "user { uid = %d; };\n", id);
1861 break;
1862 case TRACKER_VUID:
1863 seq_printf(m, "user { vuid = %d; };\n", id);
1864 break;
1865 case TRACKER_GID:
1866 seq_printf(m, "group { gid = %d; };\n", id);
1867 break;
1868 case TRACKER_VGID:
1869 seq_printf(m, "group { vgid = %d; };\n", id);
1870 break;
1871 default:
1872 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1873 }
7e6f9ef6
MD		 1874 return 0;
1875}
1876
1877static
d1f652f8
MD		 1878const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1879 .start = id_list_start,
1880 .next = id_list_next,
1881 .stop = id_list_stop,
1882 .show = id_list_show,
7e6f9ef6
MD		 1883};
1884
1885static
d1f652f8 1886int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1887{
d1f652f8 1888 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1889}
1890
1891static
d1f652f8 1892int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1893{
1894 struct seq_file *m = file->private_data;
8c0393c3 1895 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1896 int ret;
1897
d1f652f8 1898 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1899 ret = seq_release(inode, file);
d1f652f8 1900 if (!ret)
8c0393c3 1901 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1902 return ret;
1903}
1904
d1f652f8 1905const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1906 .owner = THIS_MODULE,
d1f652f8 1907 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1908 .read = seq_read,
1909 .llseek = seq_lseek,
d1f652f8 1910 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1911};
1912
8cdc1a81 1913int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1914 enum tracker_type tracker_type)
7e6f9ef6 1915{
d1f652f8 1916 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1917 struct seq_file *m;
1918 int file_fd, ret;
1919
1920 file_fd = lttng_get_unused_fd();
1921 if (file_fd < 0) {
1922 ret = file_fd;
1923 goto fd_error;
1924 }
1925
d1f652f8
MD		 1926 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1927 &lttng_tracker_ids_list_fops,
7e6f9ef6 1928 NULL, O_RDWR);
d1f652f8
MD		 1929 if (IS_ERR(tracker_ids_list_file)) {
1930 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1931 goto file_error;
1932 }
8cdc1a81 1933 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1934 ret = -EOVERFLOW;
9c1f4643
MD		 1935 goto refcount_error;
1936 }
d1f652f8 1937 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1938 if (ret < 0)
1939 goto open_error;
d1f652f8
MD		 1940 m = tracker_ids_list_file->private_data;
1941
1942 m->private = get_tracker(session, tracker_type);
1943 BUG_ON(!m->private);
1944 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1945
1946 return file_fd;
1947
1948open_error:
8cdc1a81 1949 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1950refcount_error:
d1f652f8 1951 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1952file_error:
1953 put_unused_fd(file_fd);
1954fd_error:
1955 return ret;
1956}
1957
3c997079
MD		 1958/*
1959 * Enabler management.
1960 */
1961static
4993071a
PP		 1962int lttng_match_enabler_star_glob(const char *desc_name,
1963 const char *pattern)
3c997079 1964{
cbc19040
MD		 1965 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1966 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1967 return 0;
1968 return 1;
1969}
1970
1971static
4ecb5ad5
MD		 1972int lttng_match_enabler_name(const char *desc_name,
1973 const char *name)
3c997079 1974{
4ecb5ad5 1975 if (strcmp(desc_name, name))
3c997079
MD		 1976 return 0;
1977 return 1;
1978}
1979
437d5aa5 1980int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
8d554755 1981 struct lttng_event_enabler_common *enabler)
3c997079 1982{
4ecb5ad5 1983 const char *desc_name, *enabler_name;
badfe9f5 1984 bool compat = false, entry = false;
4ecb5ad5
MD		 1985
1986 enabler_name = enabler->event_param.name;
1987 switch (enabler->event_param.instrumentation) {
606828e4 1988 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1989 desc_name = desc->event_name;
3b861b22
FD		 1990 switch (enabler->format_type) {
1991 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1992 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1993 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1994 return lttng_match_enabler_name(desc_name, enabler_name);
1995 default:
1996 return -EINVAL;
1997 }
4ecb5ad5 1998 break;
b4a75708 1999
606828e4 2000 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 2001 desc_name = desc->event_name;
badfe9f5 2002 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 2003 desc_name += strlen("compat_");
badfe9f5
MD		 2004 compat = true;
2005 }
4ecb5ad5
MD		 2006 if (!strncmp(desc_name, "syscall_exit_",
2007 strlen("syscall_exit_"))) {
2008 desc_name += strlen("syscall_exit_");
2009 } else if (!strncmp(desc_name, "syscall_entry_",
2010 strlen("syscall_entry_"))) {
2011 desc_name += strlen("syscall_entry_");
badfe9f5 2012 entry = true;
4ecb5ad5
MD		 2013 } else {
2014 WARN_ON_ONCE(1);
2015 return -EINVAL;
2016 }
badfe9f5 2017 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 2018 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 2019 break;
606828e4 2020 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 2021 if (!entry)
2022 return 0;
2023 break;
606828e4 2024 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 2025 if (entry)
2026 return 0;
2027 break;
2028 default:
2029 return -EINVAL;
2030 }
2031 switch (enabler->event_param.u.syscall.abi) {
606828e4 2032 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2033 break;
606828e4 2034 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2035 if (compat)
2036 return 0;
2037 break;
606828e4 2038 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2039 if (!compat)
2040 return 0;
2041 break;
2042 default:
2043 return -EINVAL;
2044 }
2045 switch (enabler->event_param.u.syscall.match) {
606828e4 2046 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2047 switch (enabler->format_type) {
2048 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2049 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2050 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2051 return lttng_match_enabler_name(desc_name, enabler_name);
2052 default:
2053 return -EINVAL;
2054 }
2055 break;
606828e4 2056 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2057 return -EINVAL; /* Not implemented. */
2058 default:
2059 return -EINVAL;
2060 }
4ecb5ad5 2061 break;
b4a75708 2062
4ecb5ad5
MD		 2063 default:
2064 WARN_ON_ONCE(1);
2065 return -EINVAL;
2066 }
3c997079
MD		 2067}
2068
2069static
b2bc0bc8 2070int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2071 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2072{
8d554755 2073 struct lttng_event_enabler_common *base_enabler = lttng_event_enabler_as_enabler(
b2bc0bc8
FD		 2074 event_enabler);
2075
a67ba386 2076 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2077 return 0;
a67ba386
MD		 2078 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2079 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2080 return 1;
2081 else
2082 return 0;
2083}
2084
b01155ba
FD		 2085static
2086int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2087 struct lttng_kernel_event_notifier *event_notifier)
b01155ba 2088{
8d554755 2089 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(
b01155ba
FD		 2090 event_notifier_enabler);
2091
a67ba386 2092 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2093 return 0;
a67ba386
MD		 2094 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2095 && event_notifier->priv->group == event_notifier_enabler->group
2096 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2097 return 1;
2098 else
2099 return 0;
2100}
2101
3c997079 2102static
b2bc0bc8
FD		 2103struct lttng_enabler_ref *lttng_enabler_ref(
2104 struct list_head *enablers_ref_list,
8d554755 2105 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2106{
2107 struct lttng_enabler_ref *enabler_ref;
2108
b2bc0bc8 2109 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2110 if (enabler_ref->ref == enabler)
2111 return enabler_ref;
2112 }
2113 return NULL;
2114}
2115
3c997079 2116static
1b917d6b 2117void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2118{
f7d06400 2119 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
437d5aa5
MD		 2120 struct lttng_kernel_probe_desc *probe_desc;
2121 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2122 int i;
2123 struct list_head *probe_list;
2124
2125 probe_list = lttng_get_probe_list_head();
2126 /*
2127 * For each probe event, if we find that a probe event matches
2128 * our enabler, create an associated lttng_event if not
2129 * already present.
2130 */
2131 list_for_each_entry(probe_desc, probe_list, head) {
2132 for (i = 0; i < probe_desc->nr_events; i++) {
2133 int found = 0;
2134 struct hlist_head *head;
a67ba386
MD		 2135 struct lttng_kernel_event_recorder_private *event_recorder_private;
2136 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2137
2138 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2139 if (!lttng_desc_match_enabler(desc,
2140 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2141 continue;
3c997079
MD		 2142
2143 /*
2144 * Check if already created.
2145 */
4a11ef1c 2146 head = utils_borrow_hash_table_bucket(
8cdc1a81 2147 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2148 desc->event_name);
a67ba386
MD		 2149 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2150 if (event_recorder_private->parent.desc == desc
2151 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2152 found = 1;
2153 }
2154 if (found)
2155 continue;
2156
2157 /*
2158 * We need to create an event for this
2159 * event probe.
2160 */
def1e304 2161 event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
a67ba386 2162 if (!event_recorder) {
5a15f70c 2163 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2164 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2165 }
2166 }
2167 }
2168}
2169
b01155ba
FD		 2170static
2171void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2172{
2173 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2174 struct lttng_kernel_probe_desc *probe_desc;
2175 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2176 int i;
2177 struct list_head *probe_list;
2178
2179 probe_list = lttng_get_probe_list_head();
2180 /*
2181 * For each probe event, if we find that a probe event matches
2182 * our enabler, create an associated lttng_event_notifier if not
2183 * already present.
2184 */
2185 list_for_each_entry(probe_desc, probe_list, head) {
2186 for (i = 0; i < probe_desc->nr_events; i++) {
2187 int found = 0;
2188 struct hlist_head *head;
a67ba386
MD		 2189 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2190 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2191
2192 desc = probe_desc->event_desc[i];
2193 if (!lttng_desc_match_enabler(desc,
2194 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2195 continue;
2196
2197 /*
2198 * Check if already created.
2199 */
2200 head = utils_borrow_hash_table_bucket(
2201 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2202 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2203 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2204 if (event_notifier_priv->parent.desc == desc
2205 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2206 found = 1;
2207 }
2208 if (found)
2209 continue;
2210
2211 /*
2212 * We need to create a event_notifier for this event probe.
2213 */
2214 event_notifier = _lttng_event_notifier_create(desc,
2215 event_notifier_enabler->base.user_token,
99f52fcc 2216 event_notifier_enabler->error_counter_index,
a67ba386 2217 event_notifier_group, NULL,
606828e4 2218 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2219 if (IS_ERR(event_notifier)) {
2220 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2221 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2222 }
2223 }
2224 }
2225}
2226
33a39a3c 2227static
1b917d6b 2228void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2229{
2230 int ret;
2231
a67ba386 2232 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2233 WARN_ON_ONCE(ret);
2234}
2235
8a8ac9a8
FD		 2236static
2237void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2238{
2239 int ret;
2240
a67ba386 2241 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2242 WARN_ON_ONCE(ret);
a67ba386 2243 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2244 WARN_ON_ONCE(ret);
2245}
2246
33a39a3c 2247/*
a67ba386 2248 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2249 * tracepoint probes.
2250 * Should be called with sessions mutex held.
2251 */
2252static
b2bc0bc8 2253void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2254{
b2bc0bc8 2255 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2256 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2257 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2258 break;
b4a75708 2259
606828e4 2260 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2261 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2262 break;
b4a75708 2263
33a39a3c
MD		 2264 default:
2265 WARN_ON_ONCE(1);
2266 break;
2267 }
2268}
2269
3c997079 2270/*
b2bc0bc8 2271 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2272 * and add backward reference from the event to the enabler.
2273 * Should be called with sessions mutex held.
2274 */
2275static
b2bc0bc8 2276int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2277{
f7d06400
MD		 2278 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2279 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
8d554755 2280 struct lttng_event_enabler_common *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2281 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2282
606828e4
MD		 2283 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2284 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2285 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2286 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2287 int enabled = base_enabler->enabled;
606828e4 2288 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2289
606828e4 2290 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
f7d06400 2291 WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled);
3b82c4e1 2292
606828e4 2293 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
f7d06400 2294 WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled);
badfe9f5
MD		 2295 }
2296
3c997079 2297 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2298 lttng_create_event_if_missing(event_enabler);
3c997079 2299
b2bc0bc8 2300 /* For each event matching event_enabler in session event list. */
8cdc1a81 2301 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2302 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2303 struct lttng_enabler_ref *enabler_ref;
2304
a67ba386 2305 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2306 continue;
a67ba386 2307 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2308 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2309 if (!enabler_ref) {
2310 /*
2311 * If no backward ref, create it.
b2bc0bc8 2312 * Add backward ref from event to event_enabler.
3c997079
MD		 2313 */
2314 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2315 if (!enabler_ref)
2316 return -ENOMEM;
b2bc0bc8 2317 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2318 list_add(&enabler_ref->node,
a67ba386 2319 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2320 }
2321
f127e61e
MD		 2322 /*
2323 * Link filter bytecodes if not linked yet.
2324 */
a67ba386 2325 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2326 lttng_static_ctx,
a67ba386 2327 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2328 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2329 }
2330 return 0;
2331}
2332
b01155ba 2333/*
a67ba386 2334 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2335 * tracepoint probes.
2336 * Should be called with sessions mutex held.
2337 */
2338static
2339void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2340{
2341 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2342 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2343 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2344 break;
b4a75708 2345
606828e4 2346 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2347 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2348 break;
b4a75708 2349
b01155ba
FD		 2350 default:
2351 WARN_ON_ONCE(1);
2352 break;
2353 }
2354}
2355
2356/*
2357 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2358 */
2359static
8a8ac9a8
FD		 2360int lttng_event_notifier_enabler_ref_event_notifiers(
2361 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2362{
2363 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8d554755 2364 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2365 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2366
606828e4
MD		 2367 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2368 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2369 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2370 !strcmp(base_enabler->event_param.name, "*")) {
2371
2372 int enabled = base_enabler->enabled;
606828e4 2373 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2374
606828e4 2375 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2376 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2377
606828e4 2378 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2379 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2380
2381 }
2382
b01155ba
FD		 2383 /* First ensure that probe event_notifiers are created for this enabler. */
2384 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2385
2386 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2387 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2388 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2389 struct lttng_enabler_ref *enabler_ref;
2390
2391 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2392 continue;
2393
a67ba386 2394 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2395 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2396 if (!enabler_ref) {
2397 /*
2398 * If no backward ref, create it.
2399 * Add backward ref from event_notifier to enabler.
2400 */
2401 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2402 if (!enabler_ref)
2403 return -ENOMEM;
2404
2405 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2406 event_notifier_enabler);
2407 list_add(&enabler_ref->node,
a67ba386 2408 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2409 }
2410
2411 /*
2412 * Link filter bytecodes if not linked yet.
2413 */
a67ba386
MD		 2414 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2415 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2416 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2417
2418 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2419 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2420 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2421 &event_notifier_enabler->capture_bytecode_head);
2422
a67ba386 2423 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2424 }
2425 return 0;
2426}
2427
3c997079
MD		 2428/*
2429 * Called at module load: connect the probe on all enablers matching
2430 * this event.
2431 * Called with sessions lock held.
2432 */
2433int lttng_fix_pending_events(void)
2434{
8cdc1a81 2435 struct lttng_kernel_session_private *session_priv;
3c997079 2436
8cdc1a81
MD		 2437 list_for_each_entry(session_priv, &sessions, list)
2438 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2439 return 0;
2440}
2441
b01155ba
FD		 2442static bool lttng_event_notifier_group_has_active_event_notifiers(
2443 struct lttng_event_notifier_group *event_notifier_group)
2444{
2445 struct lttng_event_notifier_enabler *event_notifier_enabler;
2446
2447 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2448 node) {
2449 if (event_notifier_enabler->base.enabled)
2450 return true;
2451 }
2452 return false;
2453}
2454
2455bool lttng_event_notifier_active(void)
2456{
2457 struct lttng_event_notifier_group *event_notifier_group;
2458
2459 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2460 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2461 return true;
2462 }
2463 return false;
2464}
2465
2466int lttng_fix_pending_event_notifiers(void)
2467{
2468 struct lttng_event_notifier_group *event_notifier_group;
2469
2470 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2471 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2472 return 0;
2473}
2474
b2bc0bc8
FD		 2475struct lttng_event_enabler *lttng_event_enabler_create(
2476 enum lttng_enabler_format_type format_type,
606828e4 2477 struct lttng_kernel_abi_event *event_param,
f7d06400 2478 struct lttng_kernel_channel_buffer *chan)
3c997079 2479{
b2bc0bc8 2480 struct lttng_event_enabler *event_enabler;
3c997079 2481
b2bc0bc8
FD		 2482 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2483 if (!event_enabler)
3c997079 2484 return NULL;
b2bc0bc8
FD		 2485 event_enabler->base.format_type = format_type;
2486 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2487 memcpy(&event_enabler->base.event_param, event_param,
2488 sizeof(event_enabler->base.event_param));
2489 event_enabler->chan = chan;
3c997079 2490 /* ctx left NULL */
b2bc0bc8 2491 event_enabler->base.enabled = 0;
def1e304
MD		 2492 return event_enabler;
2493}
2494
2495void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
2496 struct lttng_event_enabler *event_enabler)
2497{
3c997079 2498 mutex_lock(&sessions_mutex);
def1e304
MD		 2499 list_add(&event_enabler->node, &session->priv->enablers_head);
2500 event_enabler->published = true;
2501 lttng_session_lazy_sync_event_enablers(session);
3c997079 2502 mutex_unlock(&sessions_mutex);
3c997079
MD		 2503}
2504
b2bc0bc8 2505int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2506{
2507 mutex_lock(&sessions_mutex);
b2bc0bc8 2508 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
f7d06400 2509 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079
MD		 2510 mutex_unlock(&sessions_mutex);
2511 return 0;
2512}
2513
b2bc0bc8 2514int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2515{
2516 mutex_lock(&sessions_mutex);
b2bc0bc8 2517 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
f7d06400 2518 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079
MD		 2519 mutex_unlock(&sessions_mutex);
2520 return 0;
2521}
2522
b2bc0bc8 2523static
8d554755 2524int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2525 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2526{
d64ca521 2527 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2528 uint32_t bytecode_len;
2529 int ret;
2530
2531 ret = get_user(bytecode_len, &bytecode->len);
2532 if (ret)
2533 return ret;
52cfcdf3 2534 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2535 GFP_KERNEL);
2536 if (!bytecode_node)
2537 return -ENOMEM;
2538 ret = copy_from_user(&bytecode_node->bc, bytecode,
2539 sizeof(*bytecode) + bytecode_len);
2540 if (ret)
2541 goto error_free;
b2bc0bc8 2542
8a445457 2543 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2544 bytecode_node->enabler = enabler;
2545 /* Enforce length based on allocated size */
2546 bytecode_node->bc.len = bytecode_len;
2547 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2548
07dfc1d0
MD		 2549 return 0;
2550
2551error_free:
52cfcdf3 2552 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2553 return ret;
2554}
2555
183e8b3a 2556int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2557 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2558{
2559 int ret;
183e8b3a 2560 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2561 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2562 if (ret)
2563 goto error;
2564
f7d06400 2565 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
b2bc0bc8
FD		 2566 return 0;
2567
2568error:
2569 return ret;
2570}
2571
e2d5dbc7 2572int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2573 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2574{
2575
e2d5dbc7 2576 switch (event->priv->instrumentation) {
606828e4 2577 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2578 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2579 default:
2580 return -EINVAL;
2581 }
2582}
2583
3c997079 2584static
8d554755 2585void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2586{
d64ca521 2587 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2588
2589 /* Destroy filter bytecode */
2590 list_for_each_entry_safe(filter_node, tmp_filter_node,
2591 &enabler->filter_bytecode_head, node) {
52cfcdf3 2592 lttng_kvfree(filter_node);
07dfc1d0 2593 }
b2bc0bc8
FD		 2594}
2595
b2bc0bc8
FD		 2596void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2597{
2598 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2599
def1e304
MD		 2600 if (event_enabler->published)
2601 list_del(&event_enabler->node);
b2bc0bc8 2602 kfree(event_enabler);
3c997079
MD		 2603}
2604
dffef45d
FD		 2605struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2606 struct lttng_event_notifier_group *event_notifier_group,
2607 enum lttng_enabler_format_type format_type,
606828e4 2608 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2609{
2610 struct lttng_event_notifier_enabler *event_notifier_enabler;
2611
2612 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2613 if (!event_notifier_enabler)
2614 return NULL;
2615
2616 event_notifier_enabler->base.format_type = format_type;
2617 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2618 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2619
99f52fcc 2620 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2621 event_notifier_enabler->num_captures = 0;
dffef45d 2622
8a8ac9a8
FD		 2623 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2624 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2625
2626 event_notifier_enabler->base.enabled = 0;
2627 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2628 event_notifier_enabler->group = event_notifier_group;
2629
2630 mutex_lock(&sessions_mutex);
2631 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2632 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2633
2634 mutex_unlock(&sessions_mutex);
2635
2636 return event_notifier_enabler;
2637}
2638
2639int lttng_event_notifier_enabler_enable(
2640 struct lttng_event_notifier_enabler *event_notifier_enabler)
2641{
2642 mutex_lock(&sessions_mutex);
2643 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2644 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2645 mutex_unlock(&sessions_mutex);
2646 return 0;
2647}
2648
2649int lttng_event_notifier_enabler_disable(
2650 struct lttng_event_notifier_enabler *event_notifier_enabler)
2651{
2652 mutex_lock(&sessions_mutex);
2653 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2654 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2655 mutex_unlock(&sessions_mutex);
2656 return 0;
2657}
2658
183e8b3a 2659int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2660 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2661 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2662{
2663 int ret;
2664
183e8b3a 2665 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2666 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2667 bytecode);
2668 if (ret)
2669 goto error;
2670
b01155ba 2671 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2672 return 0;
2673
2674error:
2675 return ret;
2676}
2677
99d223ad
FD		 2678int lttng_event_notifier_enabler_attach_capture_bytecode(
2679 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2680 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2681{
d64ca521 2682 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2683 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2684 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2685 uint32_t bytecode_len;
2686 int ret;
2687
2688 ret = get_user(bytecode_len, &bytecode->len);
2689 if (ret)
2690 return ret;
2691
2692 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2693 GFP_KERNEL);
2694 if (!bytecode_node)
2695 return -ENOMEM;
2696
2697 ret = copy_from_user(&bytecode_node->bc, bytecode,
2698 sizeof(*bytecode) + bytecode_len);
2699 if (ret)
2700 goto error_free;
2701
8a445457 2702 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2703 bytecode_node->enabler = enabler;
2704
2705 /* Enforce length based on allocated size */
2706 bytecode_node->bc.len = bytecode_len;
2707 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2708
2709 event_notifier_enabler->num_captures++;
2710
2711 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2712 goto end;
2713
2714error_free:
2715 lttng_kvfree(bytecode_node);
2716end:
2717 return ret;
2718}
2719
dffef45d
FD		 2720static
2721void lttng_event_notifier_enabler_destroy(
2722 struct lttng_event_notifier_enabler *event_notifier_enabler)
2723{
2724 if (!event_notifier_enabler) {
2725 return;
2726 }
2727
2728 list_del(&event_notifier_enabler->node);
2729
2730 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2731 kfree(event_notifier_enabler);
2732}
2733
3c997079 2734/*
b2bc0bc8 2735 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2736 * session.
2737 * Should be called with sessions mutex held.
2738 */
2739static
8cdc1a81 2740void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2741{
b2bc0bc8 2742 struct lttng_event_enabler *event_enabler;
a67ba386 2743 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2744
8cdc1a81 2745 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2746 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2747 /*
2748 * For each event, if at least one of its enablers is enabled,
2749 * and its channel and session transient states are enabled, we
2750 * enable the event, else we disable it.
2751 */
8cdc1a81 2752 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2753 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2754 struct lttng_enabler_ref *enabler_ref;
218585b9 2755 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2756 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2757 int nr_filters = 0;
3c997079 2758
a67ba386 2759 switch (event_recorder_priv->parent.instrumentation) {
c190d76e
MJ		 2760 case LTTNG_KERNEL_ABI_TRACEPOINT:
2761 lttng_fallthrough;
606828e4 2762 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2763 /* Enable events */
2764 list_for_each_entry(enabler_ref,
a67ba386 2765 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2766 if (enabler_ref->ref->enabled) {
2767 enabled = 1;
2768 break;
2769 }
2770 }
4ecb5ad5 2771 break;
b4a75708 2772
4ecb5ad5 2773 default:
3c997079
MD		 2774 /* Not handled with lazy sync. */
2775 continue;
2776 }
2777 /*
2778 * Enabled state is based on union of enablers, with
2779 * intesection of session and channel transient enable
2780 * states.
2781 */
f7d06400 2782 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2783
a67ba386 2784 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2785 /*
2786 * Sync tracepoint registration with event enabled
2787 * state.
2788 */
2789 if (enabled) {
a67ba386 2790 register_event(event_recorder);
3c997079 2791 } else {
a67ba386 2792 _lttng_event_unregister(event_recorder);
3c997079 2793 }
07dfc1d0
MD		 2794
2795 /* Check if has enablers without bytecode enabled */
2796 list_for_each_entry(enabler_ref,
a67ba386 2797 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2798 if (enabler_ref->ref->enabled
2799 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2800 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2801 break;
2802 }
2803 }
a67ba386 2804 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2805 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2806
2807 /* Enable filters */
2808 list_for_each_entry(runtime,
e2d5dbc7 2809 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2810 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2811 nr_filters++;
2812 }
2813 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2814 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2815 }
2816}
2817
2818/*
2819 * Apply enablers to session events, adding events to session if need
2820 * be. It is required after each modification applied to an active
2821 * session, and right before session "start".
2822 * "lazy" sync means we only sync if required.
2823 * Should be called with sessions mutex held.
2824 */
2825static
8cdc1a81 2826void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2827{
2828 /* We can skip if session is not active */
2829 if (!session->active)
2830 return;
b2bc0bc8 2831 lttng_session_sync_event_enablers(session);
3c997079
MD		 2832}
2833
b01155ba
FD		 2834static
2835void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2836{
2837 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2838 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2839
2840 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2841 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2842
2843 /*
2844 * For each event_notifier, if at least one of its enablers is enabled,
2845 * we enable the event_notifier, else we disable it.
2846 */
a67ba386
MD		 2847 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2848 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2849 struct lttng_enabler_ref *enabler_ref;
218585b9 2850 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2851 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2852 int nr_filters = 0, nr_captures = 0;
b01155ba 2853
a67ba386 2854 switch (event_notifier_priv->parent.instrumentation) {
c190d76e
MJ		 2855 case LTTNG_KERNEL_ABI_TRACEPOINT:
2856 lttng_fallthrough;
606828e4 2857 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2858 /* Enable event_notifiers */
2859 list_for_each_entry(enabler_ref,
a67ba386 2860 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2861 if (enabler_ref->ref->enabled) {
2862 enabled = 1;
2863 break;
2864 }
2865 }
2866 break;
b4a75708 2867
b01155ba
FD		 2868 default:
2869 /* Not handled with sync. */
2870 continue;
2871 }
2872
a67ba386 2873 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2874 /*
2875 * Sync tracepoint registration with event_notifier enabled
2876 * state.
2877 */
2878 if (enabled) {
a67ba386 2879 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2880 register_event_notifier(event_notifier);
2881 } else {
a67ba386 2882 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2883 _lttng_event_notifier_unregister(event_notifier);
2884 }
2885
2886 /* Check if has enablers without bytecode enabled */
2887 list_for_each_entry(enabler_ref,
a67ba386 2888 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2889 if (enabler_ref->ref->enabled
2890 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2891 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2892 break;
2893 }
2894 }
a67ba386 2895 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2896 has_enablers_without_filter_bytecode;
b01155ba
FD		 2897
2898 /* Enable filters */
2899 list_for_each_entry(runtime,
e2d5dbc7 2900 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2901 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2902 nr_filters++;
2903 }
2904 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2905 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2906
2907 /* Enable captures */
2908 list_for_each_entry(runtime,
e2d5dbc7 2909 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2910 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2911 nr_captures++;
2912 }
2913 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2914 }
2915}
2916
1ec3f75a 2917/*
d83004aa
JD		 2918 * Serialize at most one packet worth of metadata into a metadata
2919 * channel.
92d9f5e6
MD		 2920 * We grab the metadata cache mutex to get exclusive access to our metadata
2921 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2922 * allows us to do racy operations such as looking for remaining space left in
2923 * packet and write, since mutual exclusion protects us from concurrent writes.
2924 * Mutual exclusion on the metadata cache allow us to read the cache content
2925 * without racing against reallocation of the cache by updates.
35097f36
JD		 2926 * Returns the number of bytes written in the channel, 0 if no data
2927 * was written and a negative value on error.
1ec3f75a 2928 */
b3b8072b 2929int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2930 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2931{
8a57ec02 2932 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2933 int ret = 0;
2934 size_t len, reserve_len;
2935
f613e3e6 2936 /*
92d9f5e6
MD		 2937 * Ensure we support mutiple get_next / put sequences followed by
2938 * put_next. The metadata cache lock protects reading the metadata
2939 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2940 * "flush" operations on the buffer invoked by different processes.
2941 * Moreover, since the metadata cache memory can be reallocated, we
2942 * need to have exclusive access against updates even though we only
2943 * read it.
f613e3e6 2944 */
92d9f5e6 2945 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2946 WARN_ON(stream->metadata_in < stream->metadata_out);
2947 if (stream->metadata_in != stream->metadata_out)
de23d59d 2948 goto end;
f613e3e6 2949
9616f0bf
JD		 2950 /* Metadata regenerated, change the version. */
2951 if (stream->metadata_cache->version != stream->version)
2952 stream->version = stream->metadata_cache->version;
2953
d83004aa 2954 len = stream->metadata_cache->metadata_written -
f613e3e6 2955 stream->metadata_in;
9de2c215 2956 if (!len)
de23d59d 2957 goto end;
d83004aa 2958 reserve_len = min_t(size_t,
4a399b76 2959 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2960 len);
a775608d 2961 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2962 sizeof(char), NULL);
d83004aa
JD		 2963 /*
2964 * If reservation failed, return an error to the caller.
2965 */
c2fb9c1c 2966 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2967 if (ret != 0) {
2968 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2969 stream->coherent = false;
d83004aa
JD		 2970 goto end;
2971 }
b3b8072b 2972 stream->transport->ops.event_write(&ctx,
f613e3e6 2973 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2974 reserve_len, 1);
b3b8072b 2975 stream->transport->ops.event_commit(&ctx);
f613e3e6 2976 stream->metadata_in += reserve_len;
3e75e2a7 2977 if (reserve_len < len)
8b97fd42
MD		 2978 stream->coherent = false;
2979 else
2980 stream->coherent = true;
d83004aa
JD		 2981 ret = reserve_len;
2982
2983end:
8b97fd42
MD		 2984 if (coherent)
2985 *coherent = stream->coherent;
92d9f5e6 2986 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2987 return ret;
2988}
2989
8b97fd42 2990static
8cdc1a81 2991void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2992{
8cdc1a81
MD		 2993 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2994 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2995}
2996
2997static
8cdc1a81 2998void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2999{
8cdc1a81
MD		 3000 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3001 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 3002 struct lttng_metadata_stream *stream;
3003
8cdc1a81 3004 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 3005 wake_up_interruptible(&stream->read_wait);
8cdc1a81 3006 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 3007 }
8b97fd42
MD		 3008}
3009
d83004aa
JD		 3010/*
3011 * Write the metadata to the metadata cache.
3012 * Must be called with sessions_mutex held.
92d9f5e6
MD		 3013 * The metadata cache lock protects us from concurrent read access from
3014 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 3015 * The content of the printf is printed as a single atomic metadata
3016 * transaction.
d83004aa 3017 */
8cdc1a81 3018int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 3019 const char *fmt, ...)
3020{
c099397a 3021 char *str;
d83004aa 3022 size_t len;
c099397a
MD		 3023 va_list ap;
3024
585e5dcc 3025 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 3026
3027 va_start(ap, fmt);
3028 str = kvasprintf(GFP_KERNEL, fmt, ap);
3029 va_end(ap);
3030 if (!str)
3031 return -ENOMEM;
3032
1ec3f75a 3033 len = strlen(str);
8cdc1a81
MD		 3034 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3035 if (session->priv->metadata_cache->metadata_written + len >
3036 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 3037 char *tmp_cache_realloc;
3038 unsigned int tmp_cache_alloc_size;
3039
3040 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 3041 session->priv->metadata_cache->cache_alloc + len,
3042 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 3043 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 3044 if (!tmp_cache_realloc)
3045 goto err;
8cdc1a81 3046 if (session->priv->metadata_cache->data) {
a606b6e8 3047 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 3048 session->priv->metadata_cache->data,
3049 session->priv->metadata_cache->cache_alloc);
3050 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 3051 }
3052
8cdc1a81
MD		 3053 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3054 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3055 }
8cdc1a81
MD		 3056 memcpy(session->priv->metadata_cache->data +
3057 session->priv->metadata_cache->metadata_written,
d83004aa 3058 str, len);
8cdc1a81 3059 session->priv->metadata_cache->metadata_written += len;
c099397a 3060 kfree(str);
d83004aa 3061
d83004aa
JD		 3062 return 0;
3063
3064err:
3065 kfree(str);
3066 return -ENOMEM;
c099397a
MD		 3067}
3068
f513b2bf 3069static
8cdc1a81 3070int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3071{
3072 size_t i;
3073
3074 for (i = 0; i < nesting; i++) {
3075 int ret;
3076
3077 ret = lttng_metadata_printf(session, " ");
3078 if (ret) {
3079 return ret;
3080 }
3081 }
3082 return 0;
3083}
3084
ceabb767 3085static
8cdc1a81 3086int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3087 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3088 size_t nesting)
3089{
3090 return lttng_metadata_printf(session, " _%s;\n", field->name);
3091}
3092
3093static
8cdc1a81 3094int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3095 const struct lttng_kernel_type_integer *type,
3096 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3097 size_t nesting)
3098{
3099 int ret;
3100
ceabb767
MD		 3101 ret = print_tabs(session, nesting);
3102 if (ret)
3103 return ret;
3104 ret = lttng_metadata_printf(session,
3105 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3106 type->size,
3107 type->alignment,
3108 type->signedness,
3109 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3110 ? "none"
437d5aa5 3111 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3112 ? "UTF8"
3113 : "ASCII",
437d5aa5 3114 type->base,
ceabb767 3115#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3116 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3117#else
437d5aa5 3118 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3119#endif
3120 );
3121 return ret;
3122}
3123
f513b2bf
MD		 3124/*
3125 * Must be called with sessions_mutex held.
3126 */
3127static
8cdc1a81 3128int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3129 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3130 size_t nesting)
3131{
51ef4536 3132 const char *prev_field_name = NULL;
f513b2bf
MD		 3133 int ret;
3134 uint32_t i, nr_fields;
ceabb767
MD		 3135 unsigned int alignment;
3136
f513b2bf
MD		 3137 ret = print_tabs(session, nesting);
3138 if (ret)
3139 return ret;
3140 ret = lttng_metadata_printf(session,
3141 "struct {\n");
3142 if (ret)
3143 return ret;
437d5aa5 3144 nr_fields = type->nr_fields;
f513b2bf 3145 for (i = 0; i < nr_fields; i++) {
437d5aa5 3146 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3147
437d5aa5 3148 iter_field = type->fields[i];
51ef4536 3149 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3150 if (ret)
3151 return ret;
3152 }
3153 ret = print_tabs(session, nesting);
3154 if (ret)
3155 return ret;
437d5aa5 3156 alignment = type->alignment;
ceabb767
MD		 3157 if (alignment) {
3158 ret = lttng_metadata_printf(session,
3159 "} align(%u)",
3160 alignment);
3161 } else {
3162 ret = lttng_metadata_printf(session,
3163 "}");
3164 }
f513b2bf
MD		 3165 return ret;
3166}
3167
3168/*
3169 * Must be called with sessions_mutex held.
3170 */
3171static
8cdc1a81 3172int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3173 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3174 size_t nesting)
3175{
3176 int ret;
3177
3178 ret = _lttng_struct_type_statedump(session,
437d5aa5 3179 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3180 if (ret)
3181 return ret;
ceabb767 3182 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3183}
3184
65c85aa6
MD		 3185/*
3186 * Must be called with sessions_mutex held.
3187 */
3188static
8cdc1a81 3189int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3190 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3191 size_t nesting,
3192 const char *prev_field_name)
65c85aa6 3193{
51ef4536 3194 const char *tag_name;
65c85aa6
MD		 3195 int ret;
3196 uint32_t i, nr_choices;
3197
51ef4536
MD		 3198 tag_name = type->tag_name;
3199 if (!tag_name)
3200 tag_name = prev_field_name;
3201 if (!tag_name)
3202 return -EINVAL;
ceabb767
MD		 3203 /*
3204 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3205 */
437d5aa5 3206 if (type->alignment != 0)
ceabb767 3207 return -EINVAL;
65c85aa6
MD		 3208 ret = print_tabs(session, nesting);
3209 if (ret)
3210 return ret;
3211 ret = lttng_metadata_printf(session,
3212 "variant <_%s> {\n",
51ef4536 3213 tag_name);
65c85aa6
MD		 3214 if (ret)
3215 return ret;
437d5aa5 3216 nr_choices = type->nr_choices;
65c85aa6 3217 for (i = 0; i < nr_choices; i++) {
437d5aa5 3218 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3219
437d5aa5 3220 iter_field = type->choices[i];
51ef4536 3221 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3222 if (ret)
3223 return ret;
3224 }
3225 ret = print_tabs(session, nesting);
3226 if (ret)
3227 return ret;
3228 ret = lttng_metadata_printf(session,
3229 "}");
3230 return ret;
3231}
3232
3233/*
3234 * Must be called with sessions_mutex held.
3235 */
3236static
8cdc1a81 3237int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3238 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3239 size_t nesting,
3240 const char *prev_field_name)
65c85aa6
MD		 3241{
3242 int ret;
3243
3244 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3245 lttng_kernel_get_type_variant(field->type), nesting,
3246 prev_field_name);
65c85aa6
MD		 3247 if (ret)
3248 return ret;
ceabb767 3249 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3250}
3251
f513b2bf
MD		 3252/*
3253 * Must be called with sessions_mutex held.
3254 */
3255static
8cdc1a81 3256int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3257 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3258 size_t nesting)
3259{
3260 int ret;
437d5aa5
MD		 3261 const struct lttng_kernel_type_array *array_type;
3262 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3263
437d5aa5
MD		 3264 array_type = lttng_kernel_get_type_array(field->type);
3265 WARN_ON_ONCE(!array_type);
ceabb767 3266
437d5aa5 3267 if (array_type->alignment) {
ceabb767 3268 ret = print_tabs(session, nesting);
f513b2bf
MD		 3269 if (ret)
3270 return ret;
ceabb767
MD		 3271 ret = lttng_metadata_printf(session,
3272 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3273 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3274 field->name);
3275 if (ret)
3276 return ret;
3277 }
3278 /*
3279 * Nested compound types: Only array of structures and variants are
3280 * currently supported.
3281 */
437d5aa5 3282 elem_type = array_type->elem_type;
12bb2edb
MD		 3283 switch (elem_type->type) {
3284 case lttng_kernel_type_integer:
437d5aa5
MD		 3285 case lttng_kernel_type_struct:
3286 case lttng_kernel_type_variant:
3287 ret = _lttng_type_statedump(session, elem_type,
3288 array_type->encoding, nesting);
65c85aa6
MD		 3289 if (ret)
3290 return ret;
3291 break;
ceabb767 3292
f513b2bf
MD		 3293 default:
3294 return -EINVAL;
3295 }
3296 ret = lttng_metadata_printf(session,
3297 " _%s[%u];\n",
3298 field->name,
437d5aa5 3299 array_type->length);
f513b2bf
MD		 3300 return ret;
3301}
3302
3303/*
3304 * Must be called with sessions_mutex held.
3305 */
3306static
8cdc1a81 3307int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3308 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3309 size_t nesting,
3310 const char *prev_field_name)
f513b2bf
MD		 3311{
3312 int ret;
3313 const char *length_name;
437d5aa5
MD		 3314 const struct lttng_kernel_type_sequence *sequence_type;
3315 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3316
437d5aa5
MD		 3317 sequence_type = lttng_kernel_get_type_sequence(field->type);
3318 WARN_ON_ONCE(!sequence_type);
f513b2bf 3319
437d5aa5 3320 length_name = sequence_type->length_name;
51ef4536
MD		 3321 if (!length_name)
3322 length_name = prev_field_name;
3323 if (!length_name)
3324 return -EINVAL;
ceabb767 3325
437d5aa5 3326 if (sequence_type->alignment) {
ceabb767 3327 ret = print_tabs(session, nesting);
f513b2bf
MD		 3328 if (ret)
3329 return ret;
ceabb767
MD		 3330 ret = lttng_metadata_printf(session,
3331 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3332 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3333 field->name);
3334 if (ret)
3335 return ret;
3336 }
3337
3338 /*
3339 * Nested compound types: Only array of structures and variants are
3340 * currently supported.
3341 */
437d5aa5 3342 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3343 switch (elem_type->type) {
3344 case lttng_kernel_type_integer:
437d5aa5
MD		 3345 case lttng_kernel_type_struct:
3346 case lttng_kernel_type_variant:
3347 ret = _lttng_type_statedump(session, elem_type,
3348 sequence_type->encoding, nesting);
65c85aa6
MD		 3349 if (ret)
3350 return ret;
3351 break;
ceabb767 3352
f513b2bf
MD		 3353 default:
3354 return -EINVAL;
3355 }
3356 ret = lttng_metadata_printf(session,
3357 " _%s[ _%s ];\n",
3358 field->name,
51ef4536 3359 length_name);
f513b2bf
MD		 3360 return ret;
3361}
3362
141ddf28
MD		 3363/*
3364 * Must be called with sessions_mutex held.
3365 */
3366static
8cdc1a81 3367int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3368 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3369 size_t nesting)
3370{
d96a4a7a 3371 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3372 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3373 int ret;
3374 unsigned int i, nr_entries;
3375
437d5aa5 3376 container_type = type->container_type;
12bb2edb 3377 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3378 ret = -EINVAL;
3379 goto end;
3380 }
437d5aa5 3381 enum_desc = type->desc;
141ddf28
MD		 3382 nr_entries = enum_desc->nr_entries;
3383
3384 ret = print_tabs(session, nesting);
3385 if (ret)
3386 goto end;
ceabb767
MD		 3387 ret = lttng_metadata_printf(session, "enum : ");
3388 if (ret)
3389 goto end;
437d5aa5
MD		 3390 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3391 lttng_kernel_string_encoding_none, 0);
141ddf28 3392 if (ret)
ceabb767
MD		 3393 goto end;
3394 ret = lttng_metadata_printf(session, " {\n");
3395 if (ret)
3396 goto end;
141ddf28
MD		 3397 /* Dump all entries */
3398 for (i = 0; i < nr_entries; i++) {
437d5aa5 3399 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3400 int j, len;
3401
3402 ret = print_tabs(session, nesting + 1);
3403 if (ret)
3404 goto end;
3405 ret = lttng_metadata_printf(session,
3406 "\"");
3407 if (ret)
3408 goto end;
3409 len = strlen(entry->string);
3410 /* Escape the character '"' */
3411 for (j = 0; j < len; j++) {
3412 char c = entry->string[j];
3413
3414 switch (c) {
3415 case '"':
3416 ret = lttng_metadata_printf(session,
3417 "\\\"");
3418 break;
3419 case '\\':
3420 ret = lttng_metadata_printf(session,
3421 "\\\\");
3422 break;
3423 default:
3424 ret = lttng_metadata_printf(session,
3425 "%c", c);
3426 break;
3427 }
3428 if (ret)
3429 goto end;
3430 }
08ad1061
PP		 3431 ret = lttng_metadata_printf(session, "\"");
3432 if (ret)
3433 goto end;
3434
3435 if (entry->options.is_auto) {
3436 ret = lttng_metadata_printf(session, ",\n");
3437 if (ret)
3438 goto end;
141ddf28 3439 } else {
7c559490
MD		 3440 ret = lttng_metadata_printf(session,
3441 " = ");
3442 if (ret)
3443 goto end;
3444 if (entry->start.signedness)
141ddf28 3445 ret = lttng_metadata_printf(session,
7c559490
MD		 3446 "%lld", (long long) entry->start.value);
3447 else
3448 ret = lttng_metadata_printf(session,
3449 "%llu", entry->start.value);
3450 if (ret)
3451 goto end;
3452 if (entry->start.signedness == entry->end.signedness &&
3453 entry->start.value
3454 == entry->end.value) {
141ddf28 3455 ret = lttng_metadata_printf(session,
7c559490
MD		 3456 ",\n");
3457 } else {
3458 if (entry->end.signedness) {
3459 ret = lttng_metadata_printf(session,
3460 " ... %lld,\n",
3461 (long long) entry->end.value);
3462 } else {
3463 ret = lttng_metadata_printf(session,
3464 " ... %llu,\n",
3465 entry->end.value);
3466 }
141ddf28 3467 }
7c559490
MD		 3468 if (ret)
3469 goto end;
141ddf28 3470 }
141ddf28
MD		 3471 }
3472 ret = print_tabs(session, nesting);
3473 if (ret)
3474 goto end;
ceabb767 3475 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3476end:
3477 return ret;
3478}
3479
d83004aa
JD		 3480/*
3481 * Must be called with sessions_mutex held.
3482 */
c099397a 3483static
8cdc1a81 3484int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3485 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3486 size_t nesting)
3487{
3488 int ret;
437d5aa5 3489 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3490
437d5aa5
MD		 3491 enum_type = lttng_kernel_get_type_enum(field->type);
3492 WARN_ON_ONCE(!enum_type);
3493 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3494 if (ret)
3495 return ret;
3496 return lttng_field_name_statedump(session, field, nesting);
3497}
3498
3499static
8cdc1a81 3500int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3501 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3502 size_t nesting)
3503{
3504 int ret;
3505
437d5aa5
MD		 3506 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3507 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3508 if (ret)
3509 return ret;
3510 return lttng_field_name_statedump(session, field, nesting);
3511}
3512
3513static
8cdc1a81 3514int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3515 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3516 size_t nesting)
3517{
3518 int ret;
3519
ceabb767
MD		 3520 /* Default encoding is UTF8 */
3521 ret = print_tabs(session, nesting);
3522 if (ret)
3523 return ret;
3524 ret = lttng_metadata_printf(session,
3525 "string%s",
437d5aa5 3526 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3527 " { encoding = ASCII; }" : "");
3528 return ret;
3529}
3530
3531static
8cdc1a81 3532int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3533 const struct lttng_kernel_event_field *field,
f513b2bf 3534 size_t nesting)
ceabb767 3535{
437d5aa5 3536 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3537 int ret;
3538
437d5aa5
MD		 3539 string_type = lttng_kernel_get_type_string(field->type);
3540 WARN_ON_ONCE(!string_type);
3541 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3542 if (ret)
3543 return ret;
3544 return lttng_field_name_statedump(session, field, nesting);
3545}
3546
3547/*
3548 * Must be called with sessions_mutex held.
3549 */
3550static
8cdc1a81 3551int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3552 const struct lttng_kernel_type_common *type,
3553 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3554 size_t nesting)
c099397a 3555{
c099397a 3556 int ret = 0;
c099397a 3557
12bb2edb
MD		 3558 switch (type->type) {
3559 case lttng_kernel_type_integer:
437d5aa5
MD		 3560 ret = _lttng_integer_type_statedump(session,
3561 lttng_kernel_get_type_integer(type),
3562 parent_encoding, nesting);
8070f5c0 3563 break;
437d5aa5
MD		 3564 case lttng_kernel_type_enum:
3565 ret = _lttng_enum_type_statedump(session,
3566 lttng_kernel_get_type_enum(type),
3567 nesting);
8070f5c0 3568 break;
12bb2edb 3569 case lttng_kernel_type_string:
437d5aa5
MD		 3570 ret = _lttng_string_type_statedump(session,
3571 lttng_kernel_get_type_string(type),
3572 nesting);
ceabb767 3573 break;
437d5aa5
MD		 3574 case lttng_kernel_type_struct:
3575 ret = _lttng_struct_type_statedump(session,
3576 lttng_kernel_get_type_struct(type),
3577 nesting);
8070f5c0 3578 break;
437d5aa5
MD		 3579 case lttng_kernel_type_variant:
3580 ret = _lttng_variant_type_statedump(session,
3581 lttng_kernel_get_type_variant(type),
51ef4536 3582 nesting, NULL);
ceabb767
MD		 3583 break;
3584
3585 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3586 case lttng_kernel_type_array:
3587 case lttng_kernel_type_sequence:
ceabb767
MD		 3588 default:
3589 WARN_ON_ONCE(1);
3590 return -EINVAL;
8070f5c0 3591 }
ceabb767
MD		 3592 return ret;
3593}
8070f5c0 3594
ceabb767
MD		 3595/*
3596 * Must be called with sessions_mutex held.
3597 */
3598static
8cdc1a81 3599int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3600 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3601 size_t nesting,
3602 const char **prev_field_name_p)
ceabb767 3603{
51ef4536 3604 const char *prev_field_name = NULL;
ceabb767 3605 int ret = 0;
27d2368e 3606
51ef4536
MD		 3607 if (prev_field_name_p)
3608 prev_field_name = *prev_field_name_p;
437d5aa5 3609 switch (field->type->type) {
12bb2edb 3610 case lttng_kernel_type_integer:
ceabb767
MD		 3611 ret = _lttng_integer_field_statedump(session, field, nesting);
3612 break;
437d5aa5 3613 case lttng_kernel_type_enum:
ceabb767 3614 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3615 break;
12bb2edb 3616 case lttng_kernel_type_string:
ceabb767 3617 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3618 break;
437d5aa5 3619 case lttng_kernel_type_struct:
ceabb767 3620 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3621 break;
437d5aa5 3622 case lttng_kernel_type_array:
ceabb767 3623 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3624 break;
437d5aa5 3625 case lttng_kernel_type_sequence:
51ef4536 3626 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3627 break;
437d5aa5 3628 case lttng_kernel_type_variant:
51ef4536 3629 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3630 break;
f513b2bf 3631
8070f5c0
MD		 3632 default:
3633 WARN_ON_ONCE(1);
3634 return -EINVAL;
3635 }
51ef4536
MD		 3636 if (prev_field_name_p)
3637 *prev_field_name_p = field->name;
8070f5c0
MD		 3638 return ret;
3639}
3640
3641static
8cdc1a81 3642int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3643 struct lttng_kernel_ctx *ctx)
8070f5c0 3644{
51ef4536 3645 const char *prev_field_name = NULL;
8070f5c0
MD		 3646 int ret = 0;
3647 int i;
3648
3649 if (!ctx)
3650 return 0;
3651 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3652 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3653
51ef4536 3654 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3655 if (ret)
3656 return ret;
3657 }
3658 return ret;
3659}
3660
3661static
8cdc1a81 3662int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3663 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3664{
51ef4536 3665 const char *prev_field_name = NULL;
a67ba386 3666 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3667 int ret = 0;
3668 int i;
3669
6c8c025b
MD		 3670 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3671 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3672
51ef4536 3673 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3674 if (ret)
3675 return ret;
c099397a
MD		 3676 }
3677 return ret;
3678}
3679
d83004aa
JD		 3680/*
3681 * Must be called with sessions_mutex held.
8b97fd42
MD		 3682 * The entire event metadata is printed as a single atomic metadata
3683 * transaction.
d83004aa 3684 */
c099397a 3685static
8cdc1a81 3686int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3687 struct lttng_kernel_channel_buffer *chan,
a67ba386 3688 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3689{
3690 int ret = 0;
3691
a67ba386 3692 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3693 return 0;
f7d06400 3694 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3695 return 0;
3696
8b97fd42
MD		 3697 lttng_metadata_begin(session);
3698
c099397a
MD		 3699 ret = lttng_metadata_printf(session,
3700 "event {\n"
ae734547 3701 " name = \"%s\";\n"
c099397a 3702 " id = %u;\n"
b9074a1b 3703 " stream_id = %u;\n",
a67ba386
MD		 3704 event_recorder->priv->parent.desc->event_name,
3705 event_recorder->priv->id,
f7d06400 3706 event_recorder->chan->priv->id);
c099397a
MD		 3707 if (ret)
3708 goto end;
3709
8070f5c0 3710 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3711 " fields := struct {\n"
3712 );
3713 if (ret)
3714 goto end;
3715
a67ba386 3716 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3717 if (ret)
3718 goto end;
3719
3720 /*
3721 * LTTng space reservation can only reserve multiples of the
3722 * byte size.
3723 */
3724 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3725 " };\n"
3726 "};\n\n");
c099397a
MD		 3727 if (ret)
3728 goto end;
3729
a67ba386 3730 event_recorder->priv->metadata_dumped = 1;
c099397a 3731end:
8b97fd42 3732 lttng_metadata_end(session);
c099397a
MD		 3733 return ret;
3734
3735}
3736
d83004aa
JD		 3737/*
3738 * Must be called with sessions_mutex held.
8b97fd42
MD		 3739 * The entire channel metadata is printed as a single atomic metadata
3740 * transaction.
d83004aa 3741 */
c099397a 3742static
8cdc1a81 3743int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3744 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3745{
3746 int ret = 0;
3747
f7d06400 3748 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3749 return 0;
d83004aa 3750
f7d06400 3751 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3752 return 0;
3753
8b97fd42
MD		 3754 lttng_metadata_begin(session);
3755
f7d06400 3756 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3757 ret = lttng_metadata_printf(session,
3758 "stream {\n"
3759 " id = %u;\n"
9115fbdc 3760 " event.header := %s;\n"
b9074a1b 3761 " packet.context := struct packet_context;\n",
f7d06400
MD		 3762 chan->priv->id,
3763 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3764 "struct event_header_large");
3765 if (ret)
3766 goto end;
3767
f7d06400 3768 if (chan->priv->ctx) {
b9074a1b
MD		 3769 ret = lttng_metadata_printf(session,
3770 " event.context := struct {\n");
3771 if (ret)
3772 goto end;
3773 }
f7d06400 3774 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3775 if (ret)
3776 goto end;
f7d06400 3777 if (chan->priv->ctx) {
b9074a1b
MD		 3778 ret = lttng_metadata_printf(session,
3779 " };\n");
3780 if (ret)
3781 goto end;
3782 }
8070f5c0
MD		 3783
3784 ret = lttng_metadata_printf(session,
b9074a1b 3785 "};\n\n");
8070f5c0 3786
f7d06400 3787 chan->priv->metadata_dumped = 1;
c099397a 3788end:
8b97fd42 3789 lttng_metadata_end(session);
c099397a
MD		 3790 return ret;
3791}
3792
d83004aa
JD		 3793/*
3794 * Must be called with sessions_mutex held.
3795 */
9115fbdc 3796static
8cdc1a81 3797int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3798{
3799 return lttng_metadata_printf(session,
3800 "struct packet_context {\n"
a3ccff4f
MD		 3801 " uint64_clock_monotonic_t timestamp_begin;\n"
3802 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3803 " uint64_t content_size;\n"
3804 " uint64_t packet_size;\n"
5b3cf4f9 3805 " uint64_t packet_seq_num;\n"
a9afe705 3806 " unsigned long events_discarded;\n"
9115fbdc 3807 " uint32_t cpu_id;\n"
c6dfdf6f 3808 "};\n\n"
9115fbdc
MD		 3809 );
3810}
3811
3812/*
3813 * Compact header:
3814 * id: range: 0 - 30.
3815 * id 31 is reserved to indicate an extended header.
3816 *
3817 * Large header:
3818 * id: range: 0 - 65534.
3819 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3820 *
3821 * Must be called with sessions_mutex held.
9115fbdc
MD		 3822 */
3823static
8cdc1a81 3824int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3825{
3826 return lttng_metadata_printf(session,
3827 "struct event_header_compact {\n"
3828 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3829 " variant <id> {\n"
3830 " struct {\n"
a3ccff4f 3831 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3832 " } compact;\n"
3833 " struct {\n"
3834 " uint32_t id;\n"
a3ccff4f 3835 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3836 " } extended;\n"
3837 " } v;\n"
3838 "} align(%u);\n"
3839 "\n"
3840 "struct event_header_large {\n"
3841 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3842 " variant <id> {\n"
3843 " struct {\n"
a3ccff4f 3844 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3845 " } compact;\n"
3846 " struct {\n"
3847 " uint32_t id;\n"
a3ccff4f 3848 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3849 " } extended;\n"
3850 " } v;\n"
3851 "} align(%u);\n\n",
a90917c3
MD		 3852 lttng_alignof(uint32_t) * CHAR_BIT,
3853 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3854 );
3855}
3856
a3ccff4f
MD		 3857 /*
3858 * Approximation of NTP time of day to clock monotonic correlation,
3859 * taken at start of trace.
3860 * Yes, this is only an approximation. Yes, we can (and will) do better
3861 * in future versions.
5283350b
MD		 3862 * This function may return a negative offset. It may happen if the
3863 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3864 *
3865 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3866 * y2038 compliant.
a3ccff4f
MD		 3867 */
3868static
8967b2a3 3869int64_t measure_clock_offset(void)
a3ccff4f 3870{
dcb93448 3871 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3872 uint64_t tcf = trace_clock_freq();
dcb93448 3873 int64_t offset;
a3ccff4f 3874 unsigned long flags;
3636085f
MJ		 3875#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3876 struct timespec64 rts = { 0, 0 };
3877#else
3878 struct timespec rts = { 0, 0 };
3879#endif
a3ccff4f
MD		 3880
3881 /* Disable interrupts to increase correlation precision. */
3882 local_irq_save(flags);
3883 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3884#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3885 ktime_get_real_ts64(&rts);
3886#else
216b6baa 3887 getnstimeofday(&rts);
3636085f 3888#endif
a3ccff4f
MD		 3889 monotonic[1] = trace_clock_read64();
3890 local_irq_restore(flags);
3891
dcb93448 3892 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3893 realtime = (uint64_t) rts.tv_sec * tcf;
3894 if (tcf == NSEC_PER_SEC) {
3895 realtime += rts.tv_nsec;
3896 } else {
3897 uint64_t n = rts.tv_nsec * tcf;
3898
3899 do_div(n, NSEC_PER_SEC);
3900 realtime += n;
3901 }
dcb93448 3902 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3903 return offset;
3904}
3905
3eb95be4 3906static
8cdc1a81 3907int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3908{
0f3eaad4 3909 int ret = 0;
3eb95be4
JR		 3910 size_t i;
3911 char cur;
3912
3913 i = 0;
3914 cur = string[i];
3915 while (cur != '\0') {
3916 switch (cur) {
3917 case '\n':
3918 ret = lttng_metadata_printf(session, "%s", "\\n");
3919 break;
3920 case '\\':
3921 case '"':
3922 ret = lttng_metadata_printf(session, "%c", '\\');
3923 if (ret)
3924 goto error;
3925 /* We still print the current char */
c190d76e 3926 lttng_fallthrough;
3eb95be4
JR		 3927 default:
3928 ret = lttng_metadata_printf(session, "%c", cur);
3929 break;
3930 }
3931
3932 if (ret)
3933 goto error;
3934
3935 cur = string[++i];
3936 }
3937error:
3938 return ret;
3939}
3940
3941static
8cdc1a81 3942int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3943 const char *field_value)
3eb95be4
JR		 3944{
3945 int ret;
3946
1c88f269 3947 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3948 if (ret)
3949 goto error;
3950
1c88f269 3951 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3952 if (ret)
3953 goto error;
3954
3955 ret = lttng_metadata_printf(session, "\";\n");
3956
3957error:
3958 return ret;
3959}
3960
c099397a
MD		 3961/*
3962 * Output metadata into this session's metadata buffers.
d83004aa 3963 * Must be called with sessions_mutex held.
c099397a
MD		 3964 */
3965static
8cdc1a81 3966int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3967{
8cdc1a81 3968 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3969 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3970 const char *product_uuid;
f7d06400 3971 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3972 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3973 int ret = 0;
3974
585e5dcc 3975 if (!LTTNG_READ_ONCE(session->active))
c099397a 3976 return 0;
8b97fd42
MD		 3977
3978 lttng_metadata_begin(session);
3979
8cdc1a81 3980 if (session->priv->metadata_dumped)
c099397a 3981 goto skip_session;
c099397a 3982
d793d5e1 3983 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3984 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3985 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3986 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3987 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3988 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3989
3990 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3991 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3992 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3993 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3994 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3995 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3996 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3997 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3998 "\n"
3999 "trace {\n"
4000 " major = %u;\n"
4001 " minor = %u;\n"
30bdb6e4 4002 " uuid = \"%s\";\n"
d793d5e1
MD		 4003 " byte_order = %s;\n"
4004 " packet.header := struct {\n"
4005 " uint32_t magic;\n"
1ec3f75a 4006 " uint8_t uuid[16];\n"
d793d5e1 4007 " uint32_t stream_id;\n"
5594698f 4008 " uint64_t stream_instance_id;\n"
0eb25f58 4009 " };\n"
d793d5e1 4010 "};\n\n",
a90917c3
MD		 4011 lttng_alignof(uint8_t) * CHAR_BIT,
4012 lttng_alignof(uint16_t) * CHAR_BIT,
4013 lttng_alignof(uint32_t) * CHAR_BIT,
4014 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 4015 sizeof(unsigned long) * CHAR_BIT,
4016 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 4017 CTF_SPEC_MAJOR,
4018 CTF_SPEC_MINOR,
d793d5e1 4019 uuid_s,
5214fa50 4020#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 4021 "be"
4022#else
4023 "le"
4024#endif
4025 );
4026 if (ret)
4027 goto end;
4028
99dc9597
MD		 4029 ret = lttng_metadata_printf(session,
4030 "env {\n"
a6058143 4031 " hostname = \"%s\";\n"
c6c9e10f 4032 " domain = \"kernel\";\n"
99dc9597 4033 " sysname = \"%s\";\n"
c6c9e10f
MD		 4034 " kernel_release = \"%s\";\n"
4035 " kernel_version = \"%s\";\n"
4036 " tracer_name = \"lttng-modules\";\n"
4037 " tracer_major = %d;\n"
4038 " tracer_minor = %d;\n"
4039 " tracer_patchlevel = %d;\n"
3eb95be4 4040 " trace_buffering_scheme = \"global\";\n",
3d0d43db 4041 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 4042 utsname()->sysname,
4043 utsname()->release,
c6c9e10f
MD		 4044 utsname()->version,
4045 LTTNG_MODULES_MAJOR_VERSION,
4046 LTTNG_MODULES_MINOR_VERSION,
4047 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 4048 );
4049 if (ret)
4050 goto end;
4051
8cdc1a81 4052 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4053 if (ret)
4054 goto end;
4055 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4056 session->priv->creation_time);
3eb95be4
JR		 4057 if (ret)
4058 goto end;
4059
c88f762e
GB		 4060 /* Add the product UUID to the 'env' section */
4061 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4062 if (product_uuid) {
4063 ret = lttng_metadata_printf(session,
4064 " product_uuid = \"%s\";\n",
4065 product_uuid
4066 );
4067 if (ret)
4068 goto end;
4069 }
4070
4071 /* Close the 'env' section */
3eb95be4
JR		 4072 ret = lttng_metadata_printf(session, "};\n\n");
4073 if (ret)
4074 goto end;
4075
a3ccff4f
MD		 4076 ret = lttng_metadata_printf(session,
4077 "clock {\n"
2754583e
MD		 4078 " name = \"%s\";\n",
4079 trace_clock_name()
a82c63f1
MD		 4080 );
4081 if (ret)
4082 goto end;
4083
4084 if (!trace_clock_uuid(clock_uuid_s)) {
4085 ret = lttng_metadata_printf(session,
7c27cb17 4086 " uuid = \"%s\";\n",
a82c63f1
MD		 4087 clock_uuid_s
4088 );
4089 if (ret)
4090 goto end;
4091 }
4092
4093 ret = lttng_metadata_printf(session,
2754583e 4094 " description = \"%s\";\n"
a3ccff4f
MD		 4095 " freq = %llu; /* Frequency, in Hz */\n"
4096 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4097 " offset = %lld;\n"
a3ccff4f 4098 "};\n\n",
2754583e 4099 trace_clock_description(),
a3ccff4f 4100 (unsigned long long) trace_clock_freq(),
8967b2a3 4101 (long long) measure_clock_offset()
a3ccff4f
MD		 4102 );
4103 if (ret)
4104 goto end;
4105
4106 ret = lttng_metadata_printf(session,
4107 "typealias integer {\n"
4108 " size = 27; align = 1; signed = false;\n"
2754583e 4109 " map = clock.%s.value;\n"
a3ccff4f
MD		 4110 "} := uint27_clock_monotonic_t;\n"
4111 "\n"
4112 "typealias integer {\n"
4113 " size = 32; align = %u; signed = false;\n"
2754583e 4114 " map = clock.%s.value;\n"
a3ccff4f
MD		 4115 "} := uint32_clock_monotonic_t;\n"
4116 "\n"
4117 "typealias integer {\n"
4118 " size = 64; align = %u; signed = false;\n"
2754583e 4119 " map = clock.%s.value;\n"
a3ccff4f 4120 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4121 trace_clock_name(),
a3ccff4f 4122 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4123 trace_clock_name(),
4124 lttng_alignof(uint64_t) * CHAR_BIT,
4125 trace_clock_name()
a3ccff4f
MD		 4126 );
4127 if (ret)
4128 goto end;
4129
a90917c3 4130 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4131 if (ret)
4132 goto end;
4133
a90917c3 4134 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4135 if (ret)
4136 goto end;
4137
c099397a 4138skip_session:
f7d06400
MD		 4139 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4140 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4141 if (ret)
4142 goto end;
4143 }
4144
8cdc1a81 4145 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386
MD		 4146 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4147 event_recorder_priv->pub);
c099397a
MD		 4148 if (ret)
4149 goto end;
4150 }
8cdc1a81 4151 session->priv->metadata_dumped = 1;
c099397a 4152end:
8b97fd42 4153 lttng_metadata_end(session);
c099397a
MD		 4154 return ret;
4155}
4156
c0e31d2e 4157/**
a90917c3 4158 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4159 * @transport: transport structure
4160 *
4161 * Registers a transport which can be used as output to extract the data out of
4162 * LTTng. The module calling this registration function must ensure that no
4163 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4164 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4165 * is made visible to the transport function. This registration acts as a
263b6c88 4166 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4167 * after its registration must it synchronize the TLBs.
4168 */
a90917c3 4169void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4170{
4171 /*
4172 * Make sure no page fault can be triggered by the module about to be
4173 * registered. We deal with this here so we don't have to call
263b6c88 4174 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4175 */
263b6c88 4176 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4177
4178 mutex_lock(&sessions_mutex);
a90917c3 4179 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4180 mutex_unlock(&sessions_mutex);
4181}
a90917c3 4182EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4183
4184/**
a90917c3 4185 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4186 * @transport: transport structure
4187 */
a90917c3 4188void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4189{
4190 mutex_lock(&sessions_mutex);
4191 list_del(&transport->node);
4192 mutex_unlock(&sessions_mutex);
4193}
a90917c3 4194EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4195
a101fa10
MD		 4196void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4197{
4198 /*
4199 * Make sure no page fault can be triggered by the module about to be
4200 * registered. We deal with this here so we don't have to call
4201 * vmalloc_sync_mappings() in each module's init.
4202 */
4203 wrapper_vmalloc_sync_mappings();
4204
4205 mutex_lock(&sessions_mutex);
4206 list_add_tail(&transport->node, &lttng_counter_transport_list);
4207 mutex_unlock(&sessions_mutex);
4208}
4209EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4210
4211void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4212{
4213 mutex_lock(&sessions_mutex);
4214 list_del(&transport->node);
4215 mutex_unlock(&sessions_mutex);
4216}
4217EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4218
5f4c791e 4219#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4220
4221enum cpuhp_state lttng_hp_prepare;
4222enum cpuhp_state lttng_hp_online;
4223
4224static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4225{
4226 struct lttng_cpuhp_node *lttng_node;
4227
4228 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4229 switch (lttng_node->component) {
4230 case LTTNG_RING_BUFFER_FRONTEND:
4231 return 0;
4232 case LTTNG_RING_BUFFER_BACKEND:
4233 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4234 case LTTNG_RING_BUFFER_ITER:
4235 return 0;
4236 case LTTNG_CONTEXT_PERF_COUNTERS:
4237 return 0;
4238 default:
4239 return -EINVAL;
4240 }
4241}
4242
4243static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4244{
4245 struct lttng_cpuhp_node *lttng_node;
4246
4247 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4248 switch (lttng_node->component) {
4249 case LTTNG_RING_BUFFER_FRONTEND:
4250 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4251 case LTTNG_RING_BUFFER_BACKEND:
4252 return 0;
4253 case LTTNG_RING_BUFFER_ITER:
4254 return 0;
4255 case LTTNG_CONTEXT_PERF_COUNTERS:
4256 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4257 default:
4258 return -EINVAL;
4259 }
4260}
4261
4262static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4263{
4264 struct lttng_cpuhp_node *lttng_node;
4265
4266 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4267 switch (lttng_node->component) {
4268 case LTTNG_RING_BUFFER_FRONTEND:
4269 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4270 case LTTNG_RING_BUFFER_BACKEND:
4271 return 0;
4272 case LTTNG_RING_BUFFER_ITER:
4273 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4274 case LTTNG_CONTEXT_PERF_COUNTERS:
4275 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4276 default:
4277 return -EINVAL;
4278 }
4279}
4280
4281static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4282{
4283 struct lttng_cpuhp_node *lttng_node;
4284
4285 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4286 switch (lttng_node->component) {
4287 case LTTNG_RING_BUFFER_FRONTEND:
4288 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4289 case LTTNG_RING_BUFFER_BACKEND:
4290 return 0;
4291 case LTTNG_RING_BUFFER_ITER:
4292 return 0;
4293 case LTTNG_CONTEXT_PERF_COUNTERS:
4294 return 0;
4295 default:
4296 return -EINVAL;
4297 }
4298}
4299
4300static int __init lttng_init_cpu_hotplug(void)
4301{
4302 int ret;
4303
4304 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4305 lttng_hotplug_prepare,
4306 lttng_hotplug_dead);
4307 if (ret < 0) {
4308 return ret;
4309 }
4310 lttng_hp_prepare = ret;
4311 lttng_rb_set_hp_prepare(ret);
4312
4313 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4314 lttng_hotplug_online,
4315 lttng_hotplug_offline);
4316 if (ret < 0) {
4317 cpuhp_remove_multi_state(lttng_hp_prepare);
4318 lttng_hp_prepare = 0;
4319 return ret;
4320 }
4321 lttng_hp_online = ret;
4322 lttng_rb_set_hp_online(ret);
4323
4324 return 0;
4325}
4326
4327static void __exit lttng_exit_cpu_hotplug(void)
4328{
4329 lttng_rb_set_hp_online(0);
4330 cpuhp_remove_multi_state(lttng_hp_online);
4331 lttng_rb_set_hp_prepare(0);
4332 cpuhp_remove_multi_state(lttng_hp_prepare);
4333}
4334
5f4c791e 4335#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4336static int lttng_init_cpu_hotplug(void)
4337{
4338 return 0;
4339}
4340static void lttng_exit_cpu_hotplug(void)
4341{
4342}
5f4c791e 4343#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4344
a90917c3 4345static int __init lttng_events_init(void)
4e3c1b9b 4346{
1c25284c
MD		 4347 int ret;
4348
453b2495
JD		 4349 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4350 if (ret)
4351 return ret;
389d7070 4352 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4353 if (ret)
4354 return ret;
4355 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4356 if (ret)
4357 return ret;
4358 ret = lttng_probes_init();
389d7070
MD		 4359 if (ret)
4360 return ret;
07dfc1d0 4361 ret = lttng_context_init();
20591cf7
MD		 4362 if (ret)
4363 return ret;
07dfc1d0
MD		 4364 ret = lttng_tracepoint_init();
4365 if (ret)
4366 goto error_tp;
a67ba386
MD		 4367 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4368 if (!event_recorder_cache) {
20591cf7 4369 ret = -ENOMEM;
a67ba386 4370 goto error_kmem_event_recorder;
dffef45d 4371 }
a67ba386
MD		 4372 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4373 if (!event_recorder_private_cache) {
4374 ret = -ENOMEM;
4375 goto error_kmem_event_recorder_private;
4376 }
4377 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4378 if (!event_notifier_cache) {
4379 ret = -ENOMEM;
4380 goto error_kmem_event_notifier;
20591cf7 4381 }
a67ba386
MD		 4382 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4383 if (!event_notifier_private_cache) {
4384 ret = -ENOMEM;
4385 goto error_kmem_event_notifier_private;
4386 }
80996790 4387 ret = lttng_abi_init();
02119ee5
MD		 4388 if (ret)
4389 goto error_abi;
0c956676
MD		 4390 ret = lttng_logger_init();
4391 if (ret)
4392 goto error_logger;
1e367326
MD		 4393 ret = lttng_init_cpu_hotplug();
4394 if (ret)
4395 goto error_hotplug;
101215b7 4396 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4397 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4398 __stringify(LTTNG_MODULES_MINOR_VERSION),
4399 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4400 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4401 LTTNG_VERSION_NAME,
4402#ifdef LTTNG_EXTRA_VERSION_GIT
4403 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4404#else
4405 "",
4406#endif
4407#ifdef LTTNG_EXTRA_VERSION_NAME
4408 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4409#else
4410 "");
4411#endif
c1551e57
MJ		 4412#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4413 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4414#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4415 return 0;
0c956676 4416
1e367326
MD		 4417error_hotplug:
4418 lttng_logger_exit();
0c956676
MD		 4419error_logger:
4420 lttng_abi_exit();
02119ee5 4421error_abi:
a67ba386
MD		 4422 kmem_cache_destroy(event_notifier_private_cache);
4423error_kmem_event_notifier_private:
dffef45d
FD		 4424 kmem_cache_destroy(event_notifier_cache);
4425error_kmem_event_notifier:
a67ba386
MD		 4426 kmem_cache_destroy(event_recorder_private_cache);
4427error_kmem_event_recorder_private:
4428 kmem_cache_destroy(event_recorder_cache);
4429error_kmem_event_recorder:
20591cf7 4430 lttng_tracepoint_exit();
07dfc1d0
MD		 4431error_tp:
4432 lttng_context_exit();
101215b7 4433 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4434 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4435 __stringify(LTTNG_MODULES_MINOR_VERSION),
4436 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4437 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4438 LTTNG_VERSION_NAME,
4439#ifdef LTTNG_EXTRA_VERSION_GIT
4440 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4441#else
4442 "",
4443#endif
4444#ifdef LTTNG_EXTRA_VERSION_NAME
4445 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4446#else
4447 "");
4448#endif
1c25284c 4449 return ret;
4e3c1b9b
MD		 4450}
4451
a90917c3 4452module_init(lttng_events_init);
11b5a3c2 4453
a90917c3 4454static void __exit lttng_events_exit(void)
4e3c1b9b 4455{
8cdc1a81 4456 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4457
1e367326 4458 lttng_exit_cpu_hotplug();
0c956676 4459 lttng_logger_exit();
80996790 4460 lttng_abi_exit();
8cdc1a81
MD		 4461 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4462 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4463 kmem_cache_destroy(event_recorder_cache);
4464 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4465 kmem_cache_destroy(event_notifier_cache);
a67ba386 4466 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4467 lttng_tracepoint_exit();
07dfc1d0 4468 lttng_context_exit();
101215b7 4469 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4470 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4471 __stringify(LTTNG_MODULES_MINOR_VERSION),
4472 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4473 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4474 LTTNG_VERSION_NAME,
4475#ifdef LTTNG_EXTRA_VERSION_GIT
4476 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4477#else
4478 "",
4479#endif
4480#ifdef LTTNG_EXTRA_VERSION_NAME
4481 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4482#else
4483 "");
4484#endif
4e3c1b9b 4485}
92e94819 4486
a90917c3 4487module_exit(lttng_events_exit);
11b5a3c2 4488
7ca11e77 4489#include <generated/patches.h>
101215b7
MJ		 4490#ifdef LTTNG_EXTRA_VERSION_GIT
4491MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4492#endif
4493#ifdef LTTNG_EXTRA_VERSION_NAME
4494MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4495#endif
92e94819
MD		 4496MODULE_LICENSE("GPL and additional rights");
4497MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4498MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4499MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4500 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4501 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4502 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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