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fix: adjust ranges for RHEL 8.2 and 8.3
[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
a7008254 31#include <wrapper/uuid.h>
263b6c88 32#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 33#include <wrapper/random.h>
34#include <wrapper/tracepoint.h>
35#include <wrapper/list.h>
cbc19040 36#include <wrapper/types.h>
2df37e95
MD		 37#include <lttng/kernel-version.h>
38#include <lttng/events.h>
92bc1e23 39#include <lttng/events-internal.h>
0b365677 40#include <lttng/lttng-bytecode.h>
2df37e95 41#include <lttng/tracer.h>
21f58fb7 42#include <lttng/event-notifier-notification.h>
2df37e95
MD		 43#include <lttng/abi-old.h>
44#include <lttng/endian.h>
45#include <lttng/string-utils.h>
4a11ef1c 46#include <lttng/utils.h>
24591303
MD		 47#include <ringbuffer/backend.h>
48#include <ringbuffer/frontend.h>
3636085f 49#include <wrapper/time.h>
4e3c1b9b 50
d83004aa
JD		 51#define METADATA_CACHE_DEFAULT_SIZE 4096
52
4e3c1b9b 53static LIST_HEAD(sessions);
750b05f2 54static LIST_HEAD(event_notifier_groups);
a90917c3 55static LIST_HEAD(lttng_transport_list);
a101fa10 56static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 57/*
58 * Protect the sessions and metadata caches.
59 */
4e3c1b9b 60static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 61static struct kmem_cache *event_recorder_cache;
62static struct kmem_cache *event_recorder_private_cache;
dffef45d 63static struct kmem_cache *event_notifier_cache;
a67ba386 64static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 65
8cdc1a81
MD		 66static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
67static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b2bc0bc8 68static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
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) {
606828e4
MD		 662 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
663 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 664 ret = -EINVAL;
665 break;
b4a75708 666
606828e4
MD		 667 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
668 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 669 WRITE_ONCE(event->enabled, 1);
a0493bef 670 break;
b4a75708 671
606828e4 672 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 673 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 674 break;
b4a75708 675
606828e4
MD		 676 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
677 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
a0493bef
MD		 678 default:
679 WARN_ON_ONCE(1);
680 ret = -EINVAL;
681 }
3c997079
MD		 682end:
683 mutex_unlock(&sessions_mutex);
684 return ret;
e64957da
MD		 685}
686
9d993668 687int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 688{
689 int ret = 0;
690
691 mutex_lock(&sessions_mutex);
9d993668
MD		 692 switch (event->type) {
693 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
694 {
695 struct lttng_kernel_event_recorder *event_recorder =
696 container_of(event, struct lttng_kernel_event_recorder, parent);
697
f7d06400 698 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 699 ret = -EPERM;
700 goto end;
701 }
b01155ba 702 break;
9d993668
MD		 703 }
704 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
705 switch (event->priv->instrumentation) {
706 case LTTNG_KERNEL_ABI_KRETPROBE:
707 ret = -EINVAL;
708 goto end;
709 default:
710 break;
711 }
2b16f0c9 712 break;
dffef45d 713 default:
9d993668 714 break;
dffef45d 715 }
dffef45d 716
a67ba386 717 if (!event->enabled) {
dffef45d
FD		 718 ret = -EEXIST;
719 goto end;
720 }
a67ba386 721 switch (event->priv->instrumentation) {
606828e4
MD		 722 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
723 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 724 ret = -EINVAL;
725 break;
b4a75708 726
606828e4
MD		 727 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
728 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 729 WRITE_ONCE(event->enabled, 0);
2b16f0c9 730 break;
b4a75708 731
9d993668
MD		 732 case LTTNG_KERNEL_ABI_KRETPROBE:
733 ret = lttng_kretprobes_event_enable_state(event, 0);
734 break;
735
606828e4 736 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
606828e4 737 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 738 default:
739 WARN_ON_ONCE(1);
740 ret = -EINVAL;
741 }
742end:
743 mutex_unlock(&sessions_mutex);
744 return ret;
745}
746
f7d06400 747struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 748 const char *transport_name,
749 void *buf_addr,
4e3c1b9b
MD		 750 size_t subbuf_size, size_t num_subbuf,
751 unsigned int switch_timer_interval,
d83004aa
JD		 752 unsigned int read_timer_interval,
753 enum channel_type channel_type)
4e3c1b9b 754{
f7d06400
MD		 755 struct lttng_kernel_channel_buffer *chan;
756 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 757 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 758
759 mutex_lock(&sessions_mutex);
8cdc1a81 760 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 761 goto active; /* Refuse to add channel to active session */
a90917c3 762 transport = lttng_transport_find(transport_name);
f3d01b96 763 if (!transport) {
5a15f70c 764 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 765 transport_name);
c0e31d2e 766 goto notransport;
f3d01b96 767 }
a33c9927 768 if (!try_module_get(transport->owner)) {
5a15f70c 769 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 770 goto notransport;
771 }
f7d06400 772 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 773 if (!chan)
c0e31d2e 774 goto nomem;
f7d06400
MD		 775 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
776 if (!chan_priv)
777 goto nomem_priv;
778 chan->priv = chan_priv;
779 chan_priv->pub = chan;
780 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
781 chan->parent.session = session;
782 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 783 chan->ops = &transport->ops;
125b4df4
MD		 784 /*
785 * Note: the channel creation op already writes into the packet
786 * headers. Therefore the "chan" information used as input
787 * should be already accessible.
788 */
f7d06400 789 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 790 chan, buf_addr, subbuf_size, num_subbuf,
791 switch_timer_interval, read_timer_interval);
f7d06400 792 if (!chan->priv->rb_chan)
f3d01b96 793 goto create_error;
f7d06400
MD		 794 chan->priv->parent.tstate = 1;
795 chan->parent.enabled = 1;
796 chan->priv->transport = transport;
797 chan->priv->channel_type = channel_type;
798 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 799 mutex_unlock(&sessions_mutex);
800 return chan;
801
f3d01b96 802create_error:
f7d06400
MD		 803 kfree(chan_priv);
804nomem_priv:
f3d01b96 805 kfree(chan);
c0e31d2e 806nomem:
a33c9927
MD		 807 if (transport)
808 module_put(transport->owner);
c0e31d2e 809notransport:
e5382b6d 810active:
4e3c1b9b
MD		 811 mutex_unlock(&sessions_mutex);
812 return NULL;
813}
814
815/*
d83004aa
JD		 816 * Only used internally at session destruction for per-cpu channels, and
817 * when metadata channel is released.
818 * Needs to be called with sessions mutex held.
4e3c1b9b 819 */
aa7c23a9 820static
f7d06400 821void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 822{
f7d06400
MD		 823 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
824 module_put(chan->priv->transport->owner);
825 list_del(&chan->priv->node);
826 lttng_kernel_destroy_context(chan->priv->ctx);
827 kfree(chan->priv);
4e3c1b9b
MD		 828 kfree(chan);
829}
830
f7d06400 831void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 832{
f7d06400 833 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 834
835 /* Protect the metadata cache with the sessions_mutex. */
836 mutex_lock(&sessions_mutex);
837 _lttng_channel_destroy(chan);
838 mutex_unlock(&sessions_mutex);
839}
840EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
841
842static
843void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
844{
845 stream->finalized = 1;
846 wake_up_interruptible(&stream->read_wait);
847}
848
a101fa10 849
e5382b6d
MD		 850/*
851 * Supports event creation while tracing session is active.
3c997079 852 * Needs to be called with sessions mutex held.
e5382b6d 853 */
f7d06400 854struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan,
606828e4 855 struct lttng_kernel_abi_event *event_param,
437d5aa5 856 const struct lttng_kernel_event_desc *event_desc,
606828e4 857 enum lttng_kernel_abi_instrumentation itype)
4e3c1b9b 858{
f7d06400 859 struct lttng_kernel_session *session = chan->parent.session;
a67ba386
MD		 860 struct lttng_kernel_event_recorder *event_recorder;
861 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 862 const char *event_name;
863 struct hlist_head *head;
3d084699 864 int ret;
4e3c1b9b 865
f7d06400 866 if (chan->priv->free_event_id == -1U) {
4cf0bf51 867 ret = -EMFILE;
e5382b6d 868 goto full;
abc0446a 869 }
3c997079
MD		 870
871 switch (itype) {
606828e4 872 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 873 event_name = event_desc->event_name;
3c997079 874 break;
b4a75708 875
606828e4
MD		 876 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
877 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
878 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
879 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 880 event_name = event_param->name;
881 break;
b4a75708 882
606828e4
MD		 883 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
884 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
3c997079
MD		 885 default:
886 WARN_ON_ONCE(1);
887 ret = -EINVAL;
888 goto type_error;
889 }
4a11ef1c 890
8cdc1a81 891 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
4a11ef1c 892 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 893 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
894 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
895 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 896 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 897 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 898 ret = -EEXIST;
899 goto exist;
abc0446a
MD		 900 }
901 }
3c997079 902
a67ba386
MD		 903 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
904 if (!event_recorder) {
4cf0bf51 905 ret = -ENOMEM;
4e3c1b9b 906 goto cache_error;
abc0446a 907 }
a67ba386
MD		 908 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
909 if (!event_recorder_priv) {
910 ret = -ENOMEM;
911 goto cache_private_error;
912 }
913 event_recorder_priv->pub = event_recorder;
914 event_recorder_priv->parent.pub = &event_recorder->parent;
915 event_recorder->priv = event_recorder_priv;
916 event_recorder->parent.priv = &event_recorder_priv->parent;
917 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
918
8a445457 919 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 920 event_recorder->chan = chan;
f7d06400 921 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 922 event_recorder->priv->parent.instrumentation = itype;
923 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
924 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 925
926 switch (itype) {
606828e4 927 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 928 /* Event will be enabled by enabler sync. */
a67ba386
MD		 929 event_recorder->parent.enabled = 0;
930 event_recorder->priv->parent.registered = 0;
931 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
932 if (!event_recorder->priv->parent.desc) {
4cf0bf51 933 ret = -ENOENT;
d3dbe23c 934 goto register_error;
abc0446a 935 }
3c997079
MD		 936 /* Populate lttng_event structure before event registration. */
937 smp_wmb();
baf20995 938 break;
b4a75708 939
606828e4 940 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 941 /*
942 * Needs to be explicitly enabled after creation, since
943 * we may want to apply filters.
944 */
a67ba386
MD		 945 event_recorder->parent.enabled = 0;
946 event_recorder->priv->parent.registered = 1;
3c997079
MD		 947 /*
948 * Populate lttng_event structure before event
949 * registration.
950 */
951 smp_wmb();
8bf17deb 952 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 953 event_param->u.kprobe.symbol_name,
954 event_param->u.kprobe.offset,
955 event_param->u.kprobe.addr,
a67ba386 956 event_recorder);
abc0446a 957 if (ret) {
4cf0bf51 958 ret = -EINVAL;
d6d808f3 959 goto register_error;
abc0446a 960 }
a67ba386 961 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 962 WARN_ON_ONCE(!ret);
d6d808f3 963 break;
b4a75708 964
606828e4 965 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 966 {
a67ba386
MD		 967 struct lttng_kernel_event_recorder *event_recorder_return;
968 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 969
970 /* kretprobe defines 2 events */
a0493bef
MD		 971 /*
972 * Needs to be explicitly enabled after creation, since
973 * we may want to apply filters.
974 */
a67ba386
MD		 975 event_recorder->parent.enabled = 0;
976 event_recorder->priv->parent.registered = 1;
977
978 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
979 if (!event_recorder_return) {
980 ret = -ENOMEM;
981 goto register_error;
982 }
983 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
984 if (!event_recorder_return_priv) {
985 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 986 ret = -ENOMEM;
7371f44c 987 goto register_error;
abc0446a 988 }
a67ba386
MD		 989 event_recorder_return_priv->pub = event_recorder_return;
990 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
991 event_recorder_return->priv = event_recorder_return_priv;
992 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
993 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
994
8a445457 995 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 996 event_recorder_return->chan = chan;
f7d06400 997 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 998 event_recorder_return->priv->parent.instrumentation = itype;
999 event_recorder_return->parent.enabled = 0;
1000 event_recorder_return->priv->parent.registered = 1;
1001 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1002 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1003 /*
a90917c3 1004 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1005 */
1006 smp_wmb();
3c997079 1007 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1008 event_param->u.kretprobe.symbol_name,
1009 event_param->u.kretprobe.offset,
1010 event_param->u.kretprobe.addr,
a67ba386 1011 event_recorder, event_recorder_return);
7371f44c 1012 if (ret) {
a67ba386
MD		 1013 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1014 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1015 ret = -EINVAL;
7371f44c
MD		 1016 goto register_error;
1017 }
1018 /* Take 2 refs on the module: one per event. */
a67ba386 1019 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1020 WARN_ON_ONCE(!ret);
a67ba386 1021 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1022 WARN_ON_ONCE(!ret);
f7d06400 1023 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1024 event_recorder_return);
abc0446a 1025 WARN_ON_ONCE(ret > 0);
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);
1029 module_put(event_recorder_return->priv->parent.desc->owner);
1030 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1031 goto statedump_error;
1032 }
f7d06400 1033 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
7371f44c
MD		 1034 break;
1035 }
b4a75708 1036
606828e4 1037 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1038 /*
1039 * Needs to be explicitly enabled after creation, since
1040 * we may want to apply filters.
1041 */
a67ba386
MD		 1042 event_recorder->parent.enabled = 0;
1043 event_recorder->priv->parent.registered = 0;
1044 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1045 switch (event_param->u.syscall.entryexit) {
606828e4 1046 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1047 ret = -EINVAL;
1048 goto register_error;
606828e4 1049 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1050 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1051 break;
606828e4 1052 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1053 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1054 break;
1055 }
1056 switch (event_param->u.syscall.abi) {
606828e4 1057 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1058 ret = -EINVAL;
1059 goto register_error;
606828e4 1060 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1061 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1062 break;
606828e4 1063 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1064 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1065 break;
1066 }
a67ba386 1067 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1068 ret = -EINVAL;
259b6cb3 1069 goto register_error;
abc0446a 1070 }
1ec65de1 1071 break;
b4a75708 1072
606828e4 1073 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1074 /*
1075 * Needs to be explicitly enabled after creation, since
1076 * we may want to apply filters.
1077 */
a67ba386
MD		 1078 event_recorder->parent.enabled = 0;
1079 event_recorder->priv->parent.registered = 1;
3aed4dca 1080
a344f64b
FD		 1081 /*
1082 * Populate lttng_event structure before event
1083 * registration.
1084 */
1085 smp_wmb();
149b9a9d 1086
83b802dc 1087 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1088 event_param->u.uprobe.fd,
a67ba386 1089 event_recorder);
149b9a9d
YB		 1090 if (ret)
1091 goto register_error;
a67ba386 1092 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1093 WARN_ON_ONCE(!ret);
1094 break;
b4a75708 1095
606828e4
MD		 1096 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1097 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
baf20995
MD		 1098 default:
1099 WARN_ON_ONCE(1);
4cf0bf51 1100 ret = -EINVAL;
df07930b 1101 goto register_error;
baf20995 1102 }
f7d06400 1103 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1104 WARN_ON_ONCE(ret > 0);
1105 if (ret) {
c099397a 1106 goto statedump_error;
abc0446a 1107 }
a67ba386 1108 hlist_add_head(&event_recorder->priv->hlist, head);
f7d06400 1109 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
a67ba386 1110 return event_recorder;
4e3c1b9b 1111
c099397a 1112statedump_error:
259b6cb3 1113 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1114register_error:
a67ba386
MD		 1115 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1116cache_private_error:
1117 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1118cache_error:
1119exist:
3c997079 1120type_error:
e5382b6d 1121full:
4cf0bf51 1122 return ERR_PTR(ret);
4e3c1b9b
MD		 1123}
1124
a67ba386 1125struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1126 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1127 uint64_t token, uint64_t error_counter_index,
1128 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1129 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1130 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1131{
a67ba386
MD		 1132 struct lttng_kernel_event_notifier *event_notifier;
1133 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1134 struct lttng_counter *error_counter;
dffef45d
FD		 1135 const char *event_name;
1136 struct hlist_head *head;
1137 int ret;
1138
1139 switch (itype) {
606828e4 1140 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1141 event_name = event_desc->event_name;
b01155ba 1142 break;
b4a75708 1143
606828e4
MD		 1144 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1145 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1146 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1147 event_name = event_notifier_param->event.name;
1148 break;
b4a75708 1149
606828e4
MD		 1150 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1151 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1152 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1153 default:
1154 WARN_ON_ONCE(1);
1155 ret = -EINVAL;
1156 goto type_error;
1157 }
1158
1159 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1160 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1161 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1162 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1163 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1164 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1165 && event_notifier_group == event_notifier_priv->group
1166 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1167 ret = -EEXIST;
1168 goto exist;
1169 }
1170 }
1171
1172 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1173 if (!event_notifier) {
1174 ret = -ENOMEM;
1175 goto cache_error;
1176 }
a67ba386
MD		 1177 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1178 if (!event_notifier_priv) {
1179 ret = -ENOMEM;
1180 goto cache_private_error;
1181 }
1182 event_notifier_priv->pub = event_notifier;
1183 event_notifier_priv->parent.pub = &event_notifier->parent;
1184 event_notifier->priv = event_notifier_priv;
1185 event_notifier->parent.priv = &event_notifier_priv->parent;
1186 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1187
1188 event_notifier->priv->group = event_notifier_group;
1189 event_notifier->priv->parent.user_token = token;
1190 event_notifier->priv->error_counter_index = error_counter_index;
1191 event_notifier->priv->num_captures = 0;
1192 event_notifier->priv->parent.instrumentation = itype;
1193 event_notifier->notification_send = lttng_event_notifier_notification_send;
1194 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1195 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1196 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1197 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1198
1199 switch (itype) {
606828e4 1200 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1201 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1202 event_notifier->parent.enabled = 0;
1203 event_notifier->priv->parent.registered = 0;
1204 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1205 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1206 ret = -ENOENT;
1207 goto register_error;
1208 }
1209 /* Populate lttng_event_notifier structure before event registration. */
1210 smp_wmb();
1211 break;
b4a75708 1212
606828e4 1213 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1214 /*
1215 * Needs to be explicitly enabled after creation, since
1216 * we may want to apply filters.
1217 */
a67ba386
MD		 1218 event_notifier->parent.enabled = 0;
1219 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1220 /*
1221 * Populate lttng_event_notifier structure before event
1222 * registration.
1223 */
1224 smp_wmb();
1225 ret = lttng_kprobes_register_event_notifier(
1226 event_notifier_param->event.u.kprobe.symbol_name,
1227 event_notifier_param->event.u.kprobe.offset,
1228 event_notifier_param->event.u.kprobe.addr,
1229 event_notifier);
1230 if (ret) {
1231 ret = -EINVAL;
1232 goto register_error;
1233 }
a67ba386 1234 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1235 WARN_ON_ONCE(!ret);
1236 break;
b4a75708 1237
606828e4 1238 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1239 /*
1240 * Needs to be explicitly enabled after creation, since
1241 * we may want to apply filters.
1242 */
a67ba386
MD		 1243 event_notifier->parent.enabled = 0;
1244 event_notifier->priv->parent.registered = 0;
1245 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1246 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1247 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1248 ret = -EINVAL;
1249 goto register_error;
606828e4 1250 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1251 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1252 break;
606828e4 1253 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1254 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1255 break;
1256 }
1257 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1258 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1259 ret = -EINVAL;
1260 goto register_error;
606828e4 1261 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1262 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1263 break;
606828e4 1264 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1265 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1266 break;
1267 }
1268
a67ba386 1269 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1270 ret = -EINVAL;
1271 goto register_error;
1272 }
1273 break;
b4a75708 1274
606828e4 1275 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1276 /*
1277 * Needs to be explicitly enabled after creation, since
1278 * we may want to apply filters.
1279 */
a67ba386
MD		 1280 event_notifier->parent.enabled = 0;
1281 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1282
1283 /*
1284 * Populate lttng_event_notifier structure before
1285 * event_notifier registration.
1286 */
1287 smp_wmb();
1288
1289 ret = lttng_uprobes_register_event_notifier(
1290 event_notifier_param->event.name,
1291 event_notifier_param->event.u.uprobe.fd,
1292 event_notifier);
1293 if (ret)
1294 goto register_error;
a67ba386 1295 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1296 WARN_ON_ONCE(!ret);
1297 break;
b4a75708 1298
606828e4
MD		 1299 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1300 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1301 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1302 default:
1303 WARN_ON_ONCE(1);
1304 ret = -EINVAL;
1305 goto register_error;
1306 }
1307
a67ba386
MD		 1308 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1309 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1310
1311 /*
1312 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1313 * bucket is currently in use. We trust it. The session lock
1314 * synchronizes against concurrent creation of the error
1315 * counter.
99f52fcc 1316 */
ab04d7b1
MD		 1317 error_counter = event_notifier_group->error_counter;
1318 if (error_counter) {
99f52fcc
FD		 1319 size_t dimension_index[1];
1320
1321 /*
1322 * Check that the index is within the boundary of the counter.
1323 */
a67ba386 1324 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1325 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1326 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1327 ret = -EINVAL;
1328 goto register_error;
1329 }
1330
a67ba386 1331 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1332 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1333 if (ret) {
1334 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1335 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1336 goto register_error;
1337 }
1338 }
1339
dffef45d
FD		 1340 return event_notifier;
1341
1342register_error:
a67ba386
MD		 1343 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1344cache_private_error:
dffef45d
FD		 1345 kmem_cache_free(event_notifier_cache, event_notifier);
1346cache_error:
1347exist:
1348type_error:
1349 return ERR_PTR(ret);
1350}
1351
99f52fcc
FD		 1352int lttng_kernel_counter_read(struct lttng_counter *counter,
1353 const size_t *dim_indexes, int32_t cpu,
1354 int64_t *val, bool *overflow, bool *underflow)
1355{
1356 return counter->ops->counter_read(counter->counter, dim_indexes,
1357 cpu, val, overflow, underflow);
1358}
1359
1360int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1361 const size_t *dim_indexes, int64_t *val,
1362 bool *overflow, bool *underflow)
1363{
1364 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1365 val, overflow, underflow);
1366}
1367
1368int lttng_kernel_counter_clear(struct lttng_counter *counter,
1369 const size_t *dim_indexes)
1370{
1371 return counter->ops->counter_clear(counter->counter, dim_indexes);
1372}
1373
f7d06400 1374struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan,
606828e4 1375 struct lttng_kernel_abi_event *event_param,
437d5aa5 1376 const struct lttng_kernel_event_desc *event_desc,
606828e4 1377 enum lttng_kernel_abi_instrumentation itype)
3c997079 1378{
a67ba386 1379 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1380
1381 mutex_lock(&sessions_mutex);
a67ba386 1382 event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype);
3c997079
MD		 1383 mutex_unlock(&sessions_mutex);
1384 return event;
1385}
1386
a67ba386 1387struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1388 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1389 uint64_t id, uint64_t error_counter_index,
1390 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1391 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1392 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1393{
a67ba386 1394 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1395
1396 mutex_lock(&sessions_mutex);
1397 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1398 error_counter_index, event_notifier_group,
a67ba386 1399 event_notifier_param, itype);
dffef45d
FD		 1400 mutex_unlock(&sessions_mutex);
1401 return event_notifier;
1402}
1403
3c997079
MD		 1404/* Only used for tracepoints for now. */
1405static
a67ba386 1406void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1407{
437d5aa5 1408 const struct lttng_kernel_event_desc *desc;
f127e61e 1409 int ret = -EINVAL;
3c997079 1410
a67ba386 1411 if (event_recorder->priv->parent.registered)
3c997079 1412 return;
4ecb5ad5 1413
a67ba386
MD		 1414 desc = event_recorder->priv->parent.desc;
1415 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1416 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1417 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1418 desc->tp_class->probe_callback,
a67ba386 1419 event_recorder);
4ecb5ad5 1420 break;
b4a75708 1421
606828e4 1422 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1423 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1424 break;
b4a75708 1425
606828e4
MD		 1426 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1427 case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */
1428 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1429 ret = 0;
1430 break;
b4a75708 1431
606828e4
MD		 1432 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1433 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
4ecb5ad5
MD		 1434 default:
1435 WARN_ON_ONCE(1);
1436 }
3c997079 1437 if (!ret)
a67ba386 1438 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1439}
1440
4e3c1b9b
MD		 1441/*
1442 * Only used internally at session destruction.
1443 */
a67ba386 1444int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1445{
a67ba386 1446 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1447 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1448 int ret = -EINVAL;
1449
a67ba386 1450 if (!event_priv->registered)
3c997079
MD		 1451 return 0;
1452
a67ba386
MD		 1453 desc = event_priv->desc;
1454 switch (event_priv->instrumentation) {
606828e4 1455 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1456 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1457 event_priv->desc->tp_class->probe_callback,
a67ba386 1458 event_recorder);
baf20995 1459 break;
b4a75708 1460
606828e4 1461 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1462 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1463 ret = 0;
1464 break;
b4a75708 1465
606828e4 1466 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1467 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1468 ret = 0;
1469 break;
b4a75708 1470
606828e4 1471 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1472 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1473 break;
b4a75708 1474
606828e4 1475 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1476 ret = 0;
1477 break;
b4a75708 1478
606828e4 1479 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1480 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1481 ret = 0;
1482 break;
b4a75708 1483
606828e4 1484 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
baf20995
MD		 1485 default:
1486 WARN_ON_ONCE(1);
1487 }
3c997079 1488 if (!ret)
a67ba386 1489 event_priv->registered = 0;
dda6a249
MD		 1490 return ret;
1491}
1492
dffef45d
FD		 1493/* Only used for tracepoints for now. */
1494static
a67ba386 1495void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1496{
437d5aa5 1497 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1498 int ret = -EINVAL;
1499
a67ba386 1500 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1501 return;
1502
a67ba386
MD		 1503 desc = event_notifier->priv->parent.desc;
1504 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1505 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1506 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1507 desc->tp_class->probe_callback,
b01155ba
FD		 1508 event_notifier);
1509 break;
b4a75708 1510
606828e4 1511 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1512 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1513 break;
b4a75708 1514
606828e4
MD		 1515 case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */
1516 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1517 ret = 0;
1518 break;
b4a75708 1519
606828e4
MD		 1520 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1521 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1522 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1523 default:
1524 WARN_ON_ONCE(1);
1525 }
1526 if (!ret)
a67ba386 1527 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1528}
1529
1530static
1531int _lttng_event_notifier_unregister(
a67ba386 1532 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1533{
437d5aa5 1534 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1535 int ret = -EINVAL;
1536
a67ba386 1537 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1538 return 0;
1539
a67ba386
MD		 1540 desc = event_notifier->priv->parent.desc;
1541 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1542 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1543 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
6c8c025b 1544 event_notifier->priv->parent.desc->tp_class->probe_callback,
b01155ba
FD		 1545 event_notifier);
1546 break;
b4a75708 1547
606828e4 1548 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1549 lttng_kprobes_unregister_event_notifier(event_notifier);
1550 ret = 0;
1551 break;
b4a75708 1552
606828e4 1553 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1554 lttng_uprobes_unregister_event_notifier(event_notifier);
1555 ret = 0;
1556 break;
b4a75708 1557
606828e4 1558 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1559 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1560 break;
b4a75708 1561
606828e4
MD		 1562 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1563 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1564 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
dffef45d
FD		 1565 default:
1566 WARN_ON_ONCE(1);
1567 }
1568 if (!ret)
a67ba386 1569 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1570 return ret;
1571}
1572
dda6a249
MD		 1573/*
1574 * Only used internally at session destruction.
1575 */
be066e6c 1576static
0648898e 1577void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1578{
0648898e 1579 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1580 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1581
0648898e
MD		 1582 lttng_free_event_filter_runtime(event);
1583 /* Free event enabler refs */
1584 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1585 &event_priv->enablers_ref_head, node)
1586 kfree(enabler_ref);
b4a75708 1587
0648898e
MD		 1588 switch (event->type) {
1589 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1590 {
1591 struct lttng_kernel_event_recorder *event_recorder =
1592 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1593
0648898e
MD		 1594 switch (event_priv->instrumentation) {
1595 case LTTNG_KERNEL_ABI_TRACEPOINT:
1596 lttng_event_desc_put(event_priv->desc);
1597 break;
b4a75708 1598
0648898e
MD		 1599 case LTTNG_KERNEL_ABI_KPROBE:
1600 module_put(event_priv->desc->owner);
1601 lttng_kprobes_destroy_event_private(event_recorder);
1602 break;
b4a75708 1603
0648898e
MD		 1604 case LTTNG_KERNEL_ABI_KRETPROBE:
1605 module_put(event_priv->desc->owner);
1606 lttng_kretprobes_destroy_private(event_recorder);
1607 break;
b4a75708 1608
0648898e
MD		 1609 case LTTNG_KERNEL_ABI_SYSCALL:
1610 break;
4e3c1b9b 1611
0648898e
MD		 1612 case LTTNG_KERNEL_ABI_UPROBE:
1613 module_put(event_priv->desc->owner);
1614 lttng_uprobes_destroy_event_private(event_recorder);
1615 break;
3ef5cc03 1616
0648898e
MD		 1617 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1618 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1619 default:
1620 WARN_ON_ONCE(1);
1621 }
1622 list_del(&event_recorder->priv->node);
1623 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1624 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1625 break;
0648898e
MD		 1626 }
1627 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1628 {
1629 struct lttng_kernel_event_notifier *event_notifier =
1630 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1631
0648898e
MD		 1632 switch (event_notifier->priv->parent.instrumentation) {
1633 case LTTNG_KERNEL_ABI_TRACEPOINT:
1634 lttng_event_desc_put(event_notifier->priv->parent.desc);
1635 break;
b4a75708 1636
0648898e
MD		 1637 case LTTNG_KERNEL_ABI_KPROBE:
1638 module_put(event_notifier->priv->parent.desc->owner);
1639 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1640 break;
b4a75708 1641
0648898e
MD		 1642 case LTTNG_KERNEL_ABI_SYSCALL:
1643 break;
b4a75708 1644
0648898e
MD		 1645 case LTTNG_KERNEL_ABI_UPROBE:
1646 module_put(event_notifier->priv->parent.desc->owner);
1647 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1648 break;
1649
1650 case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */
1651 case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */
1652 case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */
1653 default:
1654 WARN_ON_ONCE(1);
1655 }
1656 list_del(&event_notifier->priv->node);
1657 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1658 kmem_cache_free(event_notifier_cache, event_notifier);
1659 break;
1660 }
dffef45d
FD		 1661 default:
1662 WARN_ON_ONCE(1);
1663 }
dffef45d
FD		 1664}
1665
8c0393c3 1666struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1667 enum tracker_type tracker_type)
e0130fab 1668{
d1f652f8
MD		 1669 switch (tracker_type) {
1670 case TRACKER_PID:
1671 return &session->pid_tracker;
1672 case TRACKER_VPID:
1673 return &session->vpid_tracker;
1674 case TRACKER_UID:
1675 return &session->uid_tracker;
1676 case TRACKER_VUID:
1677 return &session->vuid_tracker;
1678 case TRACKER_GID:
1679 return &session->gid_tracker;
1680 case TRACKER_VGID:
1681 return &session->vgid_tracker;
1682 default:
1683 WARN_ON_ONCE(1);
1684 return NULL;
1685 }
1686}
1687
8cdc1a81 1688int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1689 enum tracker_type tracker_type, int id)
1690{
8c0393c3 1691 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1692 int ret;
1693
d1f652f8
MD		 1694 tracker = get_tracker(session, tracker_type);
1695 if (!tracker)
1696 return -EINVAL;
1697 if (id < -1)
e0130fab
MD		 1698 return -EINVAL;
1699 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1700 if (id == -1) {
1701 /* track all ids: destroy tracker. */
1702 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1703 ret = 0;
1704 } else {
d1f652f8 1705 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1706 }
e0130fab
MD		 1707 mutex_unlock(&sessions_mutex);
1708 return ret;
1709}
1710
8cdc1a81 1711int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1712 enum tracker_type tracker_type, int id)
e0130fab 1713{
8c0393c3 1714 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1715 int ret;
1716
d1f652f8
MD		 1717 tracker = get_tracker(session, tracker_type);
1718 if (!tracker)
1719 return -EINVAL;
1720 if (id < -1)
e0130fab
MD		 1721 return -EINVAL;
1722 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1723 if (id == -1) {
1724 /* untrack all ids: replace by empty tracker. */
1725 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1726 } else {
d1f652f8 1727 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1728 }
e0130fab
MD		 1729 mutex_unlock(&sessions_mutex);
1730 return ret;
1731}
1732
7e6f9ef6 1733static
d1f652f8 1734void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1735{
8c0393c3
MD		 1736 struct lttng_kernel_id_tracker *id_tracker = m->private;
1737 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1738 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1739 int iter = 0, i;
1740
1741 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1742 if (id_tracker_p) {
1743 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1744 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1745
f934e302 1746 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1747 if (iter++ >= *pos)
1748 return e;
1749 }
1750 }
1751 } else {
d1f652f8 1752 /* ID tracker disabled. */
7e6f9ef6 1753 if (iter >= *pos && iter == 0) {
d1f652f8 1754 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1755 }
1756 iter++;
1757 }
1758 /* End of list */
1759 return NULL;
1760}
1761
1762/* Called with sessions_mutex held. */
1763static
d1f652f8 1764void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1765{
8c0393c3
MD		 1766 struct lttng_kernel_id_tracker *id_tracker = m->private;
1767 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1768 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1769 int iter = 0, i;
1770
1771 (*ppos)++;
d1f652f8
MD		 1772 if (id_tracker_p) {
1773 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1774 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1775
f934e302 1776 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1777 if (iter++ >= *ppos)
1778 return e;
1779 }
1780 }
1781 } else {
d1f652f8 1782 /* ID tracker disabled. */
7e6f9ef6 1783 if (iter >= *ppos && iter == 0)
d1f652f8 1784 return p; /* empty tracker */
7e6f9ef6
MD		 1785 iter++;
1786 }
1787
1788 /* End of list */
1789 return NULL;
1790}
1791
1792static
d1f652f8 1793void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1794{
1795 mutex_unlock(&sessions_mutex);
1796}
1797
1798static
d1f652f8 1799int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1800{
8c0393c3
MD		 1801 struct lttng_kernel_id_tracker *id_tracker = m->private;
1802 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1803 int id;
7e6f9ef6 1804
d1f652f8 1805 if (p == id_tracker_p) {
7e6f9ef6 1806 /* Tracker disabled. */
d1f652f8 1807 id = -1;
7e6f9ef6 1808 } else {
d1f652f8 1809 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1810
d1f652f8
MD		 1811 id = lttng_id_tracker_get_node_id(e);
1812 }
8c0393c3 1813 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1814 case TRACKER_PID:
1815 seq_printf(m, "process { pid = %d; };\n", id);
1816 break;
1817 case TRACKER_VPID:
1818 seq_printf(m, "process { vpid = %d; };\n", id);
1819 break;
1820 case TRACKER_UID:
1821 seq_printf(m, "user { uid = %d; };\n", id);
1822 break;
1823 case TRACKER_VUID:
1824 seq_printf(m, "user { vuid = %d; };\n", id);
1825 break;
1826 case TRACKER_GID:
1827 seq_printf(m, "group { gid = %d; };\n", id);
1828 break;
1829 case TRACKER_VGID:
1830 seq_printf(m, "group { vgid = %d; };\n", id);
1831 break;
1832 default:
1833 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1834 }
7e6f9ef6
MD		 1835 return 0;
1836}
1837
1838static
d1f652f8
MD		 1839const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1840 .start = id_list_start,
1841 .next = id_list_next,
1842 .stop = id_list_stop,
1843 .show = id_list_show,
7e6f9ef6
MD		 1844};
1845
1846static
d1f652f8 1847int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1848{
d1f652f8 1849 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1850}
1851
1852static
d1f652f8 1853int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1854{
1855 struct seq_file *m = file->private_data;
8c0393c3 1856 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1857 int ret;
1858
d1f652f8 1859 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1860 ret = seq_release(inode, file);
d1f652f8 1861 if (!ret)
8c0393c3 1862 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1863 return ret;
1864}
1865
d1f652f8 1866const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1867 .owner = THIS_MODULE,
d1f652f8 1868 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1869 .read = seq_read,
1870 .llseek = seq_lseek,
d1f652f8 1871 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1872};
1873
8cdc1a81 1874int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1875 enum tracker_type tracker_type)
7e6f9ef6 1876{
d1f652f8 1877 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1878 struct seq_file *m;
1879 int file_fd, ret;
1880
1881 file_fd = lttng_get_unused_fd();
1882 if (file_fd < 0) {
1883 ret = file_fd;
1884 goto fd_error;
1885 }
1886
d1f652f8
MD		 1887 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1888 &lttng_tracker_ids_list_fops,
7e6f9ef6 1889 NULL, O_RDWR);
d1f652f8
MD		 1890 if (IS_ERR(tracker_ids_list_file)) {
1891 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1892 goto file_error;
1893 }
8cdc1a81 1894 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1895 ret = -EOVERFLOW;
9c1f4643
MD		 1896 goto refcount_error;
1897 }
d1f652f8 1898 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1899 if (ret < 0)
1900 goto open_error;
d1f652f8
MD		 1901 m = tracker_ids_list_file->private_data;
1902
1903 m->private = get_tracker(session, tracker_type);
1904 BUG_ON(!m->private);
1905 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1906
1907 return file_fd;
1908
1909open_error:
8cdc1a81 1910 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1911refcount_error:
d1f652f8 1912 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1913file_error:
1914 put_unused_fd(file_fd);
1915fd_error:
1916 return ret;
1917}
1918
3c997079
MD		 1919/*
1920 * Enabler management.
1921 */
1922static
4993071a
PP		 1923int lttng_match_enabler_star_glob(const char *desc_name,
1924 const char *pattern)
3c997079 1925{
cbc19040
MD		 1926 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1927 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1928 return 0;
1929 return 1;
1930}
1931
1932static
4ecb5ad5
MD		 1933int lttng_match_enabler_name(const char *desc_name,
1934 const char *name)
3c997079 1935{
4ecb5ad5 1936 if (strcmp(desc_name, name))
3c997079
MD		 1937 return 0;
1938 return 1;
1939}
1940
437d5aa5 1941int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
3c997079
MD		 1942 struct lttng_enabler *enabler)
1943{
4ecb5ad5 1944 const char *desc_name, *enabler_name;
badfe9f5 1945 bool compat = false, entry = false;
4ecb5ad5
MD		 1946
1947 enabler_name = enabler->event_param.name;
1948 switch (enabler->event_param.instrumentation) {
606828e4 1949 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1950 desc_name = desc->event_name;
3b861b22
FD		 1951 switch (enabler->format_type) {
1952 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1953 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1954 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1955 return lttng_match_enabler_name(desc_name, enabler_name);
1956 default:
1957 return -EINVAL;
1958 }
4ecb5ad5 1959 break;
b4a75708 1960
606828e4 1961 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 1962 desc_name = desc->event_name;
badfe9f5 1963 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1964 desc_name += strlen("compat_");
badfe9f5
MD		 1965 compat = true;
1966 }
4ecb5ad5
MD		 1967 if (!strncmp(desc_name, "syscall_exit_",
1968 strlen("syscall_exit_"))) {
1969 desc_name += strlen("syscall_exit_");
1970 } else if (!strncmp(desc_name, "syscall_entry_",
1971 strlen("syscall_entry_"))) {
1972 desc_name += strlen("syscall_entry_");
badfe9f5 1973 entry = true;
4ecb5ad5
MD		 1974 } else {
1975 WARN_ON_ONCE(1);
1976 return -EINVAL;
1977 }
badfe9f5 1978 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 1979 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 1980 break;
606828e4 1981 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 1982 if (!entry)
1983 return 0;
1984 break;
606828e4 1985 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 1986 if (entry)
1987 return 0;
1988 break;
1989 default:
1990 return -EINVAL;
1991 }
1992 switch (enabler->event_param.u.syscall.abi) {
606828e4 1993 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 1994 break;
606828e4 1995 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 1996 if (compat)
1997 return 0;
1998 break;
606828e4 1999 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2000 if (!compat)
2001 return 0;
2002 break;
2003 default:
2004 return -EINVAL;
2005 }
2006 switch (enabler->event_param.u.syscall.match) {
606828e4 2007 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2008 switch (enabler->format_type) {
2009 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2010 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2011 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2012 return lttng_match_enabler_name(desc_name, enabler_name);
2013 default:
2014 return -EINVAL;
2015 }
2016 break;
606828e4 2017 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2018 return -EINVAL; /* Not implemented. */
2019 default:
2020 return -EINVAL;
2021 }
4ecb5ad5 2022 break;
b4a75708 2023
4ecb5ad5
MD		 2024 default:
2025 WARN_ON_ONCE(1);
2026 return -EINVAL;
2027 }
3c997079
MD		 2028}
2029
2030static
b2bc0bc8 2031int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2032 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2033{
b2bc0bc8
FD		 2034 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
2035 event_enabler);
2036
a67ba386 2037 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2038 return 0;
a67ba386
MD		 2039 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2040 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2041 return 1;
2042 else
2043 return 0;
2044}
2045
b01155ba
FD		 2046static
2047int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2048 struct lttng_kernel_event_notifier *event_notifier)
b01155ba
FD		 2049{
2050 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
2051 event_notifier_enabler);
2052
a67ba386 2053 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2054 return 0;
a67ba386
MD		 2055 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2056 && event_notifier->priv->group == event_notifier_enabler->group
2057 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2058 return 1;
2059 else
2060 return 0;
2061}
2062
3c997079 2063static
b2bc0bc8
FD		 2064struct lttng_enabler_ref *lttng_enabler_ref(
2065 struct list_head *enablers_ref_list,
3c997079
MD		 2066 struct lttng_enabler *enabler)
2067{
2068 struct lttng_enabler_ref *enabler_ref;
2069
b2bc0bc8 2070 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2071 if (enabler_ref->ref == enabler)
2072 return enabler_ref;
2073 }
2074 return NULL;
2075}
2076
3c997079 2077static
1b917d6b 2078void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2079{
f7d06400 2080 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
437d5aa5
MD		 2081 struct lttng_kernel_probe_desc *probe_desc;
2082 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2083 int i;
2084 struct list_head *probe_list;
2085
2086 probe_list = lttng_get_probe_list_head();
2087 /*
2088 * For each probe event, if we find that a probe event matches
2089 * our enabler, create an associated lttng_event if not
2090 * already present.
2091 */
2092 list_for_each_entry(probe_desc, probe_list, head) {
2093 for (i = 0; i < probe_desc->nr_events; i++) {
2094 int found = 0;
2095 struct hlist_head *head;
a67ba386
MD		 2096 struct lttng_kernel_event_recorder_private *event_recorder_private;
2097 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2098
2099 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2100 if (!lttng_desc_match_enabler(desc,
2101 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2102 continue;
3c997079
MD		 2103
2104 /*
2105 * Check if already created.
2106 */
4a11ef1c 2107 head = utils_borrow_hash_table_bucket(
8cdc1a81 2108 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2109 desc->event_name);
a67ba386
MD		 2110 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2111 if (event_recorder_private->parent.desc == desc
2112 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2113 found = 1;
2114 }
2115 if (found)
2116 continue;
2117
2118 /*
2119 * We need to create an event for this
2120 * event probe.
2121 */
a67ba386
MD		 2122 event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan,
2123 NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT);
2124 if (!event_recorder) {
5a15f70c 2125 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2126 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2127 }
2128 }
2129 }
2130}
2131
b01155ba
FD		 2132static
2133void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2134{
2135 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2136 struct lttng_kernel_probe_desc *probe_desc;
2137 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2138 int i;
2139 struct list_head *probe_list;
2140
2141 probe_list = lttng_get_probe_list_head();
2142 /*
2143 * For each probe event, if we find that a probe event matches
2144 * our enabler, create an associated lttng_event_notifier if not
2145 * already present.
2146 */
2147 list_for_each_entry(probe_desc, probe_list, head) {
2148 for (i = 0; i < probe_desc->nr_events; i++) {
2149 int found = 0;
2150 struct hlist_head *head;
a67ba386
MD		 2151 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2152 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2153
2154 desc = probe_desc->event_desc[i];
2155 if (!lttng_desc_match_enabler(desc,
2156 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2157 continue;
2158
2159 /*
2160 * Check if already created.
2161 */
2162 head = utils_borrow_hash_table_bucket(
2163 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2164 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2165 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2166 if (event_notifier_priv->parent.desc == desc
2167 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2168 found = 1;
2169 }
2170 if (found)
2171 continue;
2172
2173 /*
2174 * We need to create a event_notifier for this event probe.
2175 */
2176 event_notifier = _lttng_event_notifier_create(desc,
2177 event_notifier_enabler->base.user_token,
99f52fcc 2178 event_notifier_enabler->error_counter_index,
a67ba386 2179 event_notifier_group, NULL,
606828e4 2180 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2181 if (IS_ERR(event_notifier)) {
2182 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2183 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2184 }
2185 }
2186 }
2187}
2188
33a39a3c 2189static
1b917d6b 2190void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2191{
2192 int ret;
2193
a67ba386 2194 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2195 WARN_ON_ONCE(ret);
2196}
2197
8a8ac9a8
FD		 2198static
2199void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2200{
2201 int ret;
2202
a67ba386 2203 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2204 WARN_ON_ONCE(ret);
a67ba386 2205 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2206 WARN_ON_ONCE(ret);
2207}
2208
33a39a3c 2209/*
a67ba386 2210 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2211 * tracepoint probes.
2212 * Should be called with sessions mutex held.
2213 */
2214static
b2bc0bc8 2215void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2216{
b2bc0bc8 2217 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2218 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2219 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2220 break;
b4a75708 2221
606828e4 2222 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2223 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2224 break;
b4a75708 2225
33a39a3c
MD		 2226 default:
2227 WARN_ON_ONCE(1);
2228 break;
2229 }
2230}
2231
3c997079 2232/*
b2bc0bc8 2233 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2234 * and add backward reference from the event to the enabler.
2235 * Should be called with sessions mutex held.
2236 */
2237static
b2bc0bc8 2238int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2239{
f7d06400
MD		 2240 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2241 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
b2bc0bc8 2242 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2243 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2244
606828e4
MD		 2245 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2246 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2247 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2248 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2249 int enabled = base_enabler->enabled;
606828e4 2250 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2251
606828e4 2252 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
f7d06400 2253 WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled);
3b82c4e1 2254
606828e4 2255 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
f7d06400 2256 WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled);
badfe9f5
MD		 2257 }
2258
3c997079 2259 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2260 lttng_create_event_if_missing(event_enabler);
3c997079 2261
b2bc0bc8 2262 /* For each event matching event_enabler in session event list. */
8cdc1a81 2263 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2264 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2265 struct lttng_enabler_ref *enabler_ref;
2266
a67ba386 2267 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2268 continue;
a67ba386 2269 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2270 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2271 if (!enabler_ref) {
2272 /*
2273 * If no backward ref, create it.
b2bc0bc8 2274 * Add backward ref from event to event_enabler.
3c997079
MD		 2275 */
2276 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2277 if (!enabler_ref)
2278 return -ENOMEM;
b2bc0bc8 2279 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2280 list_add(&enabler_ref->node,
a67ba386 2281 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2282 }
2283
f127e61e
MD		 2284 /*
2285 * Link filter bytecodes if not linked yet.
2286 */
a67ba386 2287 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2288 lttng_static_ctx,
a67ba386 2289 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2290 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2291 }
2292 return 0;
2293}
2294
b01155ba 2295/*
a67ba386 2296 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2297 * tracepoint probes.
2298 * Should be called with sessions mutex held.
2299 */
2300static
2301void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2302{
2303 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2304 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2305 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2306 break;
b4a75708 2307
606828e4 2308 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2309 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2310 break;
b4a75708 2311
b01155ba
FD		 2312 default:
2313 WARN_ON_ONCE(1);
2314 break;
2315 }
2316}
2317
2318/*
2319 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2320 */
2321static
8a8ac9a8
FD		 2322int lttng_event_notifier_enabler_ref_event_notifiers(
2323 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2324{
2325 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2326 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2327 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2328
606828e4
MD		 2329 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2330 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2331 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2332 !strcmp(base_enabler->event_param.name, "*")) {
2333
2334 int enabled = base_enabler->enabled;
606828e4 2335 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2336
606828e4 2337 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2338 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2339
606828e4 2340 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2341 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2342
2343 }
2344
b01155ba
FD		 2345 /* First ensure that probe event_notifiers are created for this enabler. */
2346 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2347
2348 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2349 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2350 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2351 struct lttng_enabler_ref *enabler_ref;
2352
2353 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2354 continue;
2355
a67ba386 2356 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2357 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2358 if (!enabler_ref) {
2359 /*
2360 * If no backward ref, create it.
2361 * Add backward ref from event_notifier to enabler.
2362 */
2363 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2364 if (!enabler_ref)
2365 return -ENOMEM;
2366
2367 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2368 event_notifier_enabler);
2369 list_add(&enabler_ref->node,
a67ba386 2370 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2371 }
2372
2373 /*
2374 * Link filter bytecodes if not linked yet.
2375 */
a67ba386
MD		 2376 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2377 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2378 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2379
2380 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2381 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2382 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2383 &event_notifier_enabler->capture_bytecode_head);
2384
a67ba386 2385 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2386 }
2387 return 0;
2388}
2389
3c997079
MD		 2390/*
2391 * Called at module load: connect the probe on all enablers matching
2392 * this event.
2393 * Called with sessions lock held.
2394 */
2395int lttng_fix_pending_events(void)
2396{
8cdc1a81 2397 struct lttng_kernel_session_private *session_priv;
3c997079 2398
8cdc1a81
MD		 2399 list_for_each_entry(session_priv, &sessions, list)
2400 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2401 return 0;
2402}
2403
b01155ba
FD		 2404static bool lttng_event_notifier_group_has_active_event_notifiers(
2405 struct lttng_event_notifier_group *event_notifier_group)
2406{
2407 struct lttng_event_notifier_enabler *event_notifier_enabler;
2408
2409 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2410 node) {
2411 if (event_notifier_enabler->base.enabled)
2412 return true;
2413 }
2414 return false;
2415}
2416
2417bool lttng_event_notifier_active(void)
2418{
2419 struct lttng_event_notifier_group *event_notifier_group;
2420
2421 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2422 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2423 return true;
2424 }
2425 return false;
2426}
2427
2428int lttng_fix_pending_event_notifiers(void)
2429{
2430 struct lttng_event_notifier_group *event_notifier_group;
2431
2432 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2433 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2434 return 0;
2435}
2436
b2bc0bc8
FD		 2437struct lttng_event_enabler *lttng_event_enabler_create(
2438 enum lttng_enabler_format_type format_type,
606828e4 2439 struct lttng_kernel_abi_event *event_param,
f7d06400 2440 struct lttng_kernel_channel_buffer *chan)
3c997079 2441{
b2bc0bc8 2442 struct lttng_event_enabler *event_enabler;
3c997079 2443
b2bc0bc8
FD		 2444 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2445 if (!event_enabler)
3c997079 2446 return NULL;
b2bc0bc8
FD		 2447 event_enabler->base.format_type = format_type;
2448 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2449 memcpy(&event_enabler->base.event_param, event_param,
2450 sizeof(event_enabler->base.event_param));
2451 event_enabler->chan = chan;
3c997079 2452 /* ctx left NULL */
b2bc0bc8 2453 event_enabler->base.enabled = 0;
3c997079 2454 mutex_lock(&sessions_mutex);
f7d06400
MD		 2455 list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head);
2456 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079 2457 mutex_unlock(&sessions_mutex);
b2bc0bc8 2458 return event_enabler;
3c997079
MD		 2459}
2460
b2bc0bc8 2461int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2462{
2463 mutex_lock(&sessions_mutex);
b2bc0bc8 2464 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
f7d06400 2465 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079
MD		 2466 mutex_unlock(&sessions_mutex);
2467 return 0;
2468}
2469
b2bc0bc8 2470int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2471{
2472 mutex_lock(&sessions_mutex);
b2bc0bc8 2473 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
f7d06400 2474 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079
MD		 2475 mutex_unlock(&sessions_mutex);
2476 return 0;
2477}
2478
b2bc0bc8 2479static
183e8b3a 2480int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
606828e4 2481 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2482{
d64ca521 2483 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2484 uint32_t bytecode_len;
2485 int ret;
2486
2487 ret = get_user(bytecode_len, &bytecode->len);
2488 if (ret)
2489 return ret;
52cfcdf3 2490 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2491 GFP_KERNEL);
2492 if (!bytecode_node)
2493 return -ENOMEM;
2494 ret = copy_from_user(&bytecode_node->bc, bytecode,
2495 sizeof(*bytecode) + bytecode_len);
2496 if (ret)
2497 goto error_free;
b2bc0bc8 2498
8a445457 2499 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2500 bytecode_node->enabler = enabler;
2501 /* Enforce length based on allocated size */
2502 bytecode_node->bc.len = bytecode_len;
2503 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2504
07dfc1d0
MD		 2505 return 0;
2506
2507error_free:
52cfcdf3 2508 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2509 return ret;
2510}
2511
183e8b3a 2512int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2513 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2514{
2515 int ret;
183e8b3a 2516 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2517 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2518 if (ret)
2519 goto error;
2520
f7d06400 2521 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
b2bc0bc8
FD		 2522 return 0;
2523
2524error:
2525 return ret;
2526}
2527
e2d5dbc7 2528int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2529 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2530{
2531
e2d5dbc7 2532 switch (event->priv->instrumentation) {
606828e4 2533 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2534 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2535 default:
2536 return -EINVAL;
2537 }
2538}
2539
3c997079
MD		 2540static
2541void lttng_enabler_destroy(struct lttng_enabler *enabler)
2542{
d64ca521 2543 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2544
2545 /* Destroy filter bytecode */
2546 list_for_each_entry_safe(filter_node, tmp_filter_node,
2547 &enabler->filter_bytecode_head, node) {
52cfcdf3 2548 lttng_kvfree(filter_node);
07dfc1d0 2549 }
b2bc0bc8
FD		 2550}
2551
2552static
2553void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2554{
2555 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2556
b2bc0bc8
FD		 2557 list_del(&event_enabler->node);
2558 kfree(event_enabler);
3c997079
MD		 2559}
2560
dffef45d
FD		 2561struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2562 struct lttng_event_notifier_group *event_notifier_group,
2563 enum lttng_enabler_format_type format_type,
606828e4 2564 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2565{
2566 struct lttng_event_notifier_enabler *event_notifier_enabler;
2567
2568 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2569 if (!event_notifier_enabler)
2570 return NULL;
2571
2572 event_notifier_enabler->base.format_type = format_type;
2573 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2574 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2575
99f52fcc 2576 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2577 event_notifier_enabler->num_captures = 0;
dffef45d 2578
8a8ac9a8
FD		 2579 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2580 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2581
2582 event_notifier_enabler->base.enabled = 0;
2583 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2584 event_notifier_enabler->group = event_notifier_group;
2585
2586 mutex_lock(&sessions_mutex);
2587 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2588 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2589
2590 mutex_unlock(&sessions_mutex);
2591
2592 return event_notifier_enabler;
2593}
2594
2595int lttng_event_notifier_enabler_enable(
2596 struct lttng_event_notifier_enabler *event_notifier_enabler)
2597{
2598 mutex_lock(&sessions_mutex);
2599 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2600 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2601 mutex_unlock(&sessions_mutex);
2602 return 0;
2603}
2604
2605int lttng_event_notifier_enabler_disable(
2606 struct lttng_event_notifier_enabler *event_notifier_enabler)
2607{
2608 mutex_lock(&sessions_mutex);
2609 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2610 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2611 mutex_unlock(&sessions_mutex);
2612 return 0;
2613}
2614
183e8b3a 2615int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2616 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2617 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2618{
2619 int ret;
2620
183e8b3a 2621 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2622 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2623 bytecode);
2624 if (ret)
2625 goto error;
2626
b01155ba 2627 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2628 return 0;
2629
2630error:
2631 return ret;
2632}
2633
99d223ad
FD		 2634int lttng_event_notifier_enabler_attach_capture_bytecode(
2635 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2636 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2637{
d64ca521 2638 struct lttng_kernel_bytecode_node *bytecode_node;
99d223ad
FD		 2639 struct lttng_enabler *enabler =
2640 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2641 uint32_t bytecode_len;
2642 int ret;
2643
2644 ret = get_user(bytecode_len, &bytecode->len);
2645 if (ret)
2646 return ret;
2647
2648 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2649 GFP_KERNEL);
2650 if (!bytecode_node)
2651 return -ENOMEM;
2652
2653 ret = copy_from_user(&bytecode_node->bc, bytecode,
2654 sizeof(*bytecode) + bytecode_len);
2655 if (ret)
2656 goto error_free;
2657
8a445457 2658 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2659 bytecode_node->enabler = enabler;
2660
2661 /* Enforce length based on allocated size */
2662 bytecode_node->bc.len = bytecode_len;
2663 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2664
2665 event_notifier_enabler->num_captures++;
2666
2667 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2668 goto end;
2669
2670error_free:
2671 lttng_kvfree(bytecode_node);
2672end:
2673 return ret;
2674}
2675
dffef45d
FD		 2676static
2677void lttng_event_notifier_enabler_destroy(
2678 struct lttng_event_notifier_enabler *event_notifier_enabler)
2679{
2680 if (!event_notifier_enabler) {
2681 return;
2682 }
2683
2684 list_del(&event_notifier_enabler->node);
2685
2686 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2687 kfree(event_notifier_enabler);
2688}
2689
3c997079 2690/*
b2bc0bc8 2691 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2692 * session.
2693 * Should be called with sessions mutex held.
2694 */
2695static
8cdc1a81 2696void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2697{
b2bc0bc8 2698 struct lttng_event_enabler *event_enabler;
a67ba386 2699 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2700
8cdc1a81 2701 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2702 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2703 /*
2704 * For each event, if at least one of its enablers is enabled,
2705 * and its channel and session transient states are enabled, we
2706 * enable the event, else we disable it.
2707 */
8cdc1a81 2708 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2709 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2710 struct lttng_enabler_ref *enabler_ref;
218585b9 2711 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2712 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2713 int nr_filters = 0;
3c997079 2714
a67ba386 2715 switch (event_recorder_priv->parent.instrumentation) {
606828e4
MD		 2716 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2717 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2718 /* Enable events */
2719 list_for_each_entry(enabler_ref,
a67ba386 2720 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2721 if (enabler_ref->ref->enabled) {
2722 enabled = 1;
2723 break;
2724 }
2725 }
4ecb5ad5 2726 break;
b4a75708 2727
4ecb5ad5 2728 default:
3c997079
MD		 2729 /* Not handled with lazy sync. */
2730 continue;
2731 }
2732 /*
2733 * Enabled state is based on union of enablers, with
2734 * intesection of session and channel transient enable
2735 * states.
2736 */
f7d06400 2737 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2738
a67ba386 2739 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2740 /*
2741 * Sync tracepoint registration with event enabled
2742 * state.
2743 */
2744 if (enabled) {
a67ba386 2745 register_event(event_recorder);
3c997079 2746 } else {
a67ba386 2747 _lttng_event_unregister(event_recorder);
3c997079 2748 }
07dfc1d0
MD		 2749
2750 /* Check if has enablers without bytecode enabled */
2751 list_for_each_entry(enabler_ref,
a67ba386 2752 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2753 if (enabler_ref->ref->enabled
2754 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2755 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2756 break;
2757 }
2758 }
a67ba386 2759 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2760 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2761
2762 /* Enable filters */
2763 list_for_each_entry(runtime,
e2d5dbc7 2764 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2765 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2766 nr_filters++;
2767 }
2768 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2769 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2770 }
2771}
2772
2773/*
2774 * Apply enablers to session events, adding events to session if need
2775 * be. It is required after each modification applied to an active
2776 * session, and right before session "start".
2777 * "lazy" sync means we only sync if required.
2778 * Should be called with sessions mutex held.
2779 */
2780static
8cdc1a81 2781void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2782{
2783 /* We can skip if session is not active */
2784 if (!session->active)
2785 return;
b2bc0bc8 2786 lttng_session_sync_event_enablers(session);
3c997079
MD		 2787}
2788
b01155ba
FD		 2789static
2790void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2791{
2792 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2793 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2794
2795 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2796 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2797
2798 /*
2799 * For each event_notifier, if at least one of its enablers is enabled,
2800 * we enable the event_notifier, else we disable it.
2801 */
a67ba386
MD		 2802 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2803 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2804 struct lttng_enabler_ref *enabler_ref;
218585b9 2805 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2806 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2807 int nr_filters = 0, nr_captures = 0;
b01155ba 2808
a67ba386 2809 switch (event_notifier_priv->parent.instrumentation) {
606828e4
MD		 2810 case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
2811 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2812 /* Enable event_notifiers */
2813 list_for_each_entry(enabler_ref,
a67ba386 2814 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2815 if (enabler_ref->ref->enabled) {
2816 enabled = 1;
2817 break;
2818 }
2819 }
2820 break;
b4a75708 2821
b01155ba
FD		 2822 default:
2823 /* Not handled with sync. */
2824 continue;
2825 }
2826
a67ba386 2827 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2828 /*
2829 * Sync tracepoint registration with event_notifier enabled
2830 * state.
2831 */
2832 if (enabled) {
a67ba386 2833 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2834 register_event_notifier(event_notifier);
2835 } else {
a67ba386 2836 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2837 _lttng_event_notifier_unregister(event_notifier);
2838 }
2839
2840 /* Check if has enablers without bytecode enabled */
2841 list_for_each_entry(enabler_ref,
a67ba386 2842 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2843 if (enabler_ref->ref->enabled
2844 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2845 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2846 break;
2847 }
2848 }
a67ba386 2849 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2850 has_enablers_without_filter_bytecode;
b01155ba
FD		 2851
2852 /* Enable filters */
2853 list_for_each_entry(runtime,
e2d5dbc7 2854 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2855 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2856 nr_filters++;
2857 }
2858 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2859 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2860
2861 /* Enable captures */
2862 list_for_each_entry(runtime,
e2d5dbc7 2863 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2864 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2865 nr_captures++;
2866 }
2867 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2868 }
2869}
2870
1ec3f75a 2871/*
d83004aa
JD		 2872 * Serialize at most one packet worth of metadata into a metadata
2873 * channel.
92d9f5e6
MD		 2874 * We grab the metadata cache mutex to get exclusive access to our metadata
2875 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2876 * allows us to do racy operations such as looking for remaining space left in
2877 * packet and write, since mutual exclusion protects us from concurrent writes.
2878 * Mutual exclusion on the metadata cache allow us to read the cache content
2879 * without racing against reallocation of the cache by updates.
35097f36
JD		 2880 * Returns the number of bytes written in the channel, 0 if no data
2881 * was written and a negative value on error.
1ec3f75a 2882 */
b3b8072b 2883int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2884 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2885{
8a57ec02 2886 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2887 int ret = 0;
2888 size_t len, reserve_len;
2889
f613e3e6 2890 /*
92d9f5e6
MD		 2891 * Ensure we support mutiple get_next / put sequences followed by
2892 * put_next. The metadata cache lock protects reading the metadata
2893 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2894 * "flush" operations on the buffer invoked by different processes.
2895 * Moreover, since the metadata cache memory can be reallocated, we
2896 * need to have exclusive access against updates even though we only
2897 * read it.
f613e3e6 2898 */
92d9f5e6 2899 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2900 WARN_ON(stream->metadata_in < stream->metadata_out);
2901 if (stream->metadata_in != stream->metadata_out)
de23d59d 2902 goto end;
f613e3e6 2903
9616f0bf
JD		 2904 /* Metadata regenerated, change the version. */
2905 if (stream->metadata_cache->version != stream->version)
2906 stream->version = stream->metadata_cache->version;
2907
d83004aa 2908 len = stream->metadata_cache->metadata_written -
f613e3e6 2909 stream->metadata_in;
9de2c215 2910 if (!len)
de23d59d 2911 goto end;
d83004aa 2912 reserve_len = min_t(size_t,
4a399b76 2913 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2914 len);
a775608d 2915 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2916 sizeof(char), NULL);
d83004aa
JD		 2917 /*
2918 * If reservation failed, return an error to the caller.
2919 */
c2fb9c1c 2920 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2921 if (ret != 0) {
2922 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2923 stream->coherent = false;
d83004aa
JD		 2924 goto end;
2925 }
b3b8072b 2926 stream->transport->ops.event_write(&ctx,
f613e3e6 2927 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2928 reserve_len, 1);
b3b8072b 2929 stream->transport->ops.event_commit(&ctx);
f613e3e6 2930 stream->metadata_in += reserve_len;
3e75e2a7 2931 if (reserve_len < len)
8b97fd42
MD		 2932 stream->coherent = false;
2933 else
2934 stream->coherent = true;
d83004aa
JD		 2935 ret = reserve_len;
2936
2937end:
8b97fd42
MD		 2938 if (coherent)
2939 *coherent = stream->coherent;
92d9f5e6 2940 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2941 return ret;
2942}
2943
8b97fd42 2944static
8cdc1a81 2945void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 2946{
8cdc1a81
MD		 2947 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
2948 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 2949}
2950
2951static
8cdc1a81 2952void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 2953{
8cdc1a81
MD		 2954 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2955 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 2956 struct lttng_metadata_stream *stream;
2957
8cdc1a81 2958 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 2959 wake_up_interruptible(&stream->read_wait);
8cdc1a81 2960 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 2961 }
8b97fd42
MD		 2962}
2963
d83004aa
JD		 2964/*
2965 * Write the metadata to the metadata cache.
2966 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2967 * The metadata cache lock protects us from concurrent read access from
2968 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2969 * The content of the printf is printed as a single atomic metadata
2970 * transaction.
d83004aa 2971 */
8cdc1a81 2972int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 2973 const char *fmt, ...)
2974{
c099397a 2975 char *str;
d83004aa 2976 size_t len;
c099397a
MD		 2977 va_list ap;
2978
585e5dcc 2979 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2980
2981 va_start(ap, fmt);
2982 str = kvasprintf(GFP_KERNEL, fmt, ap);
2983 va_end(ap);
2984 if (!str)
2985 return -ENOMEM;
2986
1ec3f75a 2987 len = strlen(str);
8cdc1a81
MD		 2988 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
2989 if (session->priv->metadata_cache->metadata_written + len >
2990 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 2991 char *tmp_cache_realloc;
2992 unsigned int tmp_cache_alloc_size;
2993
2994 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 2995 session->priv->metadata_cache->cache_alloc + len,
2996 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 2997 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2998 if (!tmp_cache_realloc)
2999 goto err;
8cdc1a81 3000 if (session->priv->metadata_cache->data) {
a606b6e8 3001 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 3002 session->priv->metadata_cache->data,
3003 session->priv->metadata_cache->cache_alloc);
3004 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 3005 }
3006
8cdc1a81
MD		 3007 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3008 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3009 }
8cdc1a81
MD		 3010 memcpy(session->priv->metadata_cache->data +
3011 session->priv->metadata_cache->metadata_written,
d83004aa 3012 str, len);
8cdc1a81 3013 session->priv->metadata_cache->metadata_written += len;
c099397a 3014 kfree(str);
d83004aa 3015
d83004aa
JD		 3016 return 0;
3017
3018err:
3019 kfree(str);
3020 return -ENOMEM;
c099397a
MD		 3021}
3022
f513b2bf 3023static
8cdc1a81 3024int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3025{
3026 size_t i;
3027
3028 for (i = 0; i < nesting; i++) {
3029 int ret;
3030
3031 ret = lttng_metadata_printf(session, " ");
3032 if (ret) {
3033 return ret;
3034 }
3035 }
3036 return 0;
3037}
3038
ceabb767 3039static
8cdc1a81 3040int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3041 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3042 size_t nesting)
3043{
3044 return lttng_metadata_printf(session, " _%s;\n", field->name);
3045}
3046
3047static
8cdc1a81 3048int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3049 const struct lttng_kernel_type_integer *type,
3050 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3051 size_t nesting)
3052{
3053 int ret;
3054
ceabb767
MD		 3055 ret = print_tabs(session, nesting);
3056 if (ret)
3057 return ret;
3058 ret = lttng_metadata_printf(session,
3059 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3060 type->size,
3061 type->alignment,
3062 type->signedness,
3063 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3064 ? "none"
437d5aa5 3065 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3066 ? "UTF8"
3067 : "ASCII",
437d5aa5 3068 type->base,
ceabb767 3069#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3070 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3071#else
437d5aa5 3072 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3073#endif
3074 );
3075 return ret;
3076}
3077
f513b2bf
MD		 3078/*
3079 * Must be called with sessions_mutex held.
3080 */
3081static
8cdc1a81 3082int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3083 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3084 size_t nesting)
3085{
51ef4536 3086 const char *prev_field_name = NULL;
f513b2bf
MD		 3087 int ret;
3088 uint32_t i, nr_fields;
ceabb767
MD		 3089 unsigned int alignment;
3090
f513b2bf
MD		 3091 ret = print_tabs(session, nesting);
3092 if (ret)
3093 return ret;
3094 ret = lttng_metadata_printf(session,
3095 "struct {\n");
3096 if (ret)
3097 return ret;
437d5aa5 3098 nr_fields = type->nr_fields;
f513b2bf 3099 for (i = 0; i < nr_fields; i++) {
437d5aa5 3100 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3101
437d5aa5 3102 iter_field = type->fields[i];
51ef4536 3103 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3104 if (ret)
3105 return ret;
3106 }
3107 ret = print_tabs(session, nesting);
3108 if (ret)
3109 return ret;
437d5aa5 3110 alignment = type->alignment;
ceabb767
MD		 3111 if (alignment) {
3112 ret = lttng_metadata_printf(session,
3113 "} align(%u)",
3114 alignment);
3115 } else {
3116 ret = lttng_metadata_printf(session,
3117 "}");
3118 }
f513b2bf
MD		 3119 return ret;
3120}
3121
3122/*
3123 * Must be called with sessions_mutex held.
3124 */
3125static
8cdc1a81 3126int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3127 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3128 size_t nesting)
3129{
3130 int ret;
3131
3132 ret = _lttng_struct_type_statedump(session,
437d5aa5 3133 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3134 if (ret)
3135 return ret;
ceabb767 3136 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3137}
3138
65c85aa6
MD		 3139/*
3140 * Must be called with sessions_mutex held.
3141 */
3142static
8cdc1a81 3143int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3144 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3145 size_t nesting,
3146 const char *prev_field_name)
65c85aa6 3147{
51ef4536 3148 const char *tag_name;
65c85aa6
MD		 3149 int ret;
3150 uint32_t i, nr_choices;
3151
51ef4536
MD		 3152 tag_name = type->tag_name;
3153 if (!tag_name)
3154 tag_name = prev_field_name;
3155 if (!tag_name)
3156 return -EINVAL;
ceabb767
MD		 3157 /*
3158 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3159 */
437d5aa5 3160 if (type->alignment != 0)
ceabb767 3161 return -EINVAL;
65c85aa6
MD		 3162 ret = print_tabs(session, nesting);
3163 if (ret)
3164 return ret;
3165 ret = lttng_metadata_printf(session,
3166 "variant <_%s> {\n",
51ef4536 3167 tag_name);
65c85aa6
MD		 3168 if (ret)
3169 return ret;
437d5aa5 3170 nr_choices = type->nr_choices;
65c85aa6 3171 for (i = 0; i < nr_choices; i++) {
437d5aa5 3172 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3173
437d5aa5 3174 iter_field = type->choices[i];
51ef4536 3175 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3176 if (ret)
3177 return ret;
3178 }
3179 ret = print_tabs(session, nesting);
3180 if (ret)
3181 return ret;
3182 ret = lttng_metadata_printf(session,
3183 "}");
3184 return ret;
3185}
3186
3187/*
3188 * Must be called with sessions_mutex held.
3189 */
3190static
8cdc1a81 3191int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3192 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3193 size_t nesting,
3194 const char *prev_field_name)
65c85aa6
MD		 3195{
3196 int ret;
3197
3198 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3199 lttng_kernel_get_type_variant(field->type), nesting,
3200 prev_field_name);
65c85aa6
MD		 3201 if (ret)
3202 return ret;
ceabb767 3203 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3204}
3205
f513b2bf
MD		 3206/*
3207 * Must be called with sessions_mutex held.
3208 */
3209static
8cdc1a81 3210int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3211 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3212 size_t nesting)
3213{
3214 int ret;
437d5aa5
MD		 3215 const struct lttng_kernel_type_array *array_type;
3216 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3217
437d5aa5
MD		 3218 array_type = lttng_kernel_get_type_array(field->type);
3219 WARN_ON_ONCE(!array_type);
ceabb767 3220
437d5aa5 3221 if (array_type->alignment) {
ceabb767 3222 ret = print_tabs(session, nesting);
f513b2bf
MD		 3223 if (ret)
3224 return ret;
ceabb767
MD		 3225 ret = lttng_metadata_printf(session,
3226 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3227 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3228 field->name);
3229 if (ret)
3230 return ret;
3231 }
3232 /*
3233 * Nested compound types: Only array of structures and variants are
3234 * currently supported.
3235 */
437d5aa5 3236 elem_type = array_type->elem_type;
12bb2edb
MD		 3237 switch (elem_type->type) {
3238 case lttng_kernel_type_integer:
437d5aa5
MD		 3239 case lttng_kernel_type_struct:
3240 case lttng_kernel_type_variant:
3241 ret = _lttng_type_statedump(session, elem_type,
3242 array_type->encoding, nesting);
65c85aa6
MD		 3243 if (ret)
3244 return ret;
3245 break;
ceabb767 3246
f513b2bf
MD		 3247 default:
3248 return -EINVAL;
3249 }
3250 ret = lttng_metadata_printf(session,
3251 " _%s[%u];\n",
3252 field->name,
437d5aa5 3253 array_type->length);
f513b2bf
MD		 3254 return ret;
3255}
3256
3257/*
3258 * Must be called with sessions_mutex held.
3259 */
3260static
8cdc1a81 3261int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3262 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3263 size_t nesting,
3264 const char *prev_field_name)
f513b2bf
MD		 3265{
3266 int ret;
3267 const char *length_name;
437d5aa5
MD		 3268 const struct lttng_kernel_type_sequence *sequence_type;
3269 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3270
437d5aa5
MD		 3271 sequence_type = lttng_kernel_get_type_sequence(field->type);
3272 WARN_ON_ONCE(!sequence_type);
f513b2bf 3273
437d5aa5 3274 length_name = sequence_type->length_name;
51ef4536
MD		 3275 if (!length_name)
3276 length_name = prev_field_name;
3277 if (!length_name)
3278 return -EINVAL;
ceabb767 3279
437d5aa5 3280 if (sequence_type->alignment) {
ceabb767 3281 ret = print_tabs(session, nesting);
f513b2bf
MD		 3282 if (ret)
3283 return ret;
ceabb767
MD		 3284 ret = lttng_metadata_printf(session,
3285 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3286 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3287 field->name);
3288 if (ret)
3289 return ret;
3290 }
3291
3292 /*
3293 * Nested compound types: Only array of structures and variants are
3294 * currently supported.
3295 */
437d5aa5 3296 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3297 switch (elem_type->type) {
3298 case lttng_kernel_type_integer:
437d5aa5
MD		 3299 case lttng_kernel_type_struct:
3300 case lttng_kernel_type_variant:
3301 ret = _lttng_type_statedump(session, elem_type,
3302 sequence_type->encoding, nesting);
65c85aa6
MD		 3303 if (ret)
3304 return ret;
3305 break;
ceabb767 3306
f513b2bf
MD		 3307 default:
3308 return -EINVAL;
3309 }
3310 ret = lttng_metadata_printf(session,
3311 " _%s[ _%s ];\n",
3312 field->name,
51ef4536 3313 length_name);
f513b2bf
MD		 3314 return ret;
3315}
3316
141ddf28
MD		 3317/*
3318 * Must be called with sessions_mutex held.
3319 */
3320static
8cdc1a81 3321int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3322 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3323 size_t nesting)
3324{
d96a4a7a 3325 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3326 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3327 int ret;
3328 unsigned int i, nr_entries;
3329
437d5aa5 3330 container_type = type->container_type;
12bb2edb 3331 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3332 ret = -EINVAL;
3333 goto end;
3334 }
437d5aa5 3335 enum_desc = type->desc;
141ddf28
MD		 3336 nr_entries = enum_desc->nr_entries;
3337
3338 ret = print_tabs(session, nesting);
3339 if (ret)
3340 goto end;
ceabb767
MD		 3341 ret = lttng_metadata_printf(session, "enum : ");
3342 if (ret)
3343 goto end;
437d5aa5
MD		 3344 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3345 lttng_kernel_string_encoding_none, 0);
141ddf28 3346 if (ret)
ceabb767
MD		 3347 goto end;
3348 ret = lttng_metadata_printf(session, " {\n");
3349 if (ret)
3350 goto end;
141ddf28
MD		 3351 /* Dump all entries */
3352 for (i = 0; i < nr_entries; i++) {
437d5aa5 3353 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3354 int j, len;
3355
3356 ret = print_tabs(session, nesting + 1);
3357 if (ret)
3358 goto end;
3359 ret = lttng_metadata_printf(session,
3360 "\"");
3361 if (ret)
3362 goto end;
3363 len = strlen(entry->string);
3364 /* Escape the character '"' */
3365 for (j = 0; j < len; j++) {
3366 char c = entry->string[j];
3367
3368 switch (c) {
3369 case '"':
3370 ret = lttng_metadata_printf(session,
3371 "\\\"");
3372 break;
3373 case '\\':
3374 ret = lttng_metadata_printf(session,
3375 "\\\\");
3376 break;
3377 default:
3378 ret = lttng_metadata_printf(session,
3379 "%c", c);
3380 break;
3381 }
3382 if (ret)
3383 goto end;
3384 }
08ad1061
PP		 3385 ret = lttng_metadata_printf(session, "\"");
3386 if (ret)
3387 goto end;
3388
3389 if (entry->options.is_auto) {
3390 ret = lttng_metadata_printf(session, ",\n");
3391 if (ret)
3392 goto end;
141ddf28 3393 } else {
7c559490
MD		 3394 ret = lttng_metadata_printf(session,
3395 " = ");
3396 if (ret)
3397 goto end;
3398 if (entry->start.signedness)
141ddf28 3399 ret = lttng_metadata_printf(session,
7c559490
MD		 3400 "%lld", (long long) entry->start.value);
3401 else
3402 ret = lttng_metadata_printf(session,
3403 "%llu", entry->start.value);
3404 if (ret)
3405 goto end;
3406 if (entry->start.signedness == entry->end.signedness &&
3407 entry->start.value
3408 == entry->end.value) {
141ddf28 3409 ret = lttng_metadata_printf(session,
7c559490
MD		 3410 ",\n");
3411 } else {
3412 if (entry->end.signedness) {
3413 ret = lttng_metadata_printf(session,
3414 " ... %lld,\n",
3415 (long long) entry->end.value);
3416 } else {
3417 ret = lttng_metadata_printf(session,
3418 " ... %llu,\n",
3419 entry->end.value);
3420 }
141ddf28 3421 }
7c559490
MD		 3422 if (ret)
3423 goto end;
141ddf28 3424 }
141ddf28
MD		 3425 }
3426 ret = print_tabs(session, nesting);
3427 if (ret)
3428 goto end;
ceabb767 3429 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3430end:
3431 return ret;
3432}
3433
d83004aa
JD		 3434/*
3435 * Must be called with sessions_mutex held.
3436 */
c099397a 3437static
8cdc1a81 3438int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3439 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3440 size_t nesting)
3441{
3442 int ret;
437d5aa5 3443 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3444
437d5aa5
MD		 3445 enum_type = lttng_kernel_get_type_enum(field->type);
3446 WARN_ON_ONCE(!enum_type);
3447 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3448 if (ret)
3449 return ret;
3450 return lttng_field_name_statedump(session, field, nesting);
3451}
3452
3453static
8cdc1a81 3454int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3455 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3456 size_t nesting)
3457{
3458 int ret;
3459
437d5aa5
MD		 3460 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3461 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3462 if (ret)
3463 return ret;
3464 return lttng_field_name_statedump(session, field, nesting);
3465}
3466
3467static
8cdc1a81 3468int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3469 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3470 size_t nesting)
3471{
3472 int ret;
3473
ceabb767
MD		 3474 /* Default encoding is UTF8 */
3475 ret = print_tabs(session, nesting);
3476 if (ret)
3477 return ret;
3478 ret = lttng_metadata_printf(session,
3479 "string%s",
437d5aa5 3480 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3481 " { encoding = ASCII; }" : "");
3482 return ret;
3483}
3484
3485static
8cdc1a81 3486int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3487 const struct lttng_kernel_event_field *field,
f513b2bf 3488 size_t nesting)
ceabb767 3489{
437d5aa5 3490 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3491 int ret;
3492
437d5aa5
MD		 3493 string_type = lttng_kernel_get_type_string(field->type);
3494 WARN_ON_ONCE(!string_type);
3495 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3496 if (ret)
3497 return ret;
3498 return lttng_field_name_statedump(session, field, nesting);
3499}
3500
3501/*
3502 * Must be called with sessions_mutex held.
3503 */
3504static
8cdc1a81 3505int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3506 const struct lttng_kernel_type_common *type,
3507 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3508 size_t nesting)
c099397a 3509{
c099397a 3510 int ret = 0;
c099397a 3511
12bb2edb
MD		 3512 switch (type->type) {
3513 case lttng_kernel_type_integer:
437d5aa5
MD		 3514 ret = _lttng_integer_type_statedump(session,
3515 lttng_kernel_get_type_integer(type),
3516 parent_encoding, nesting);
8070f5c0 3517 break;
437d5aa5
MD		 3518 case lttng_kernel_type_enum:
3519 ret = _lttng_enum_type_statedump(session,
3520 lttng_kernel_get_type_enum(type),
3521 nesting);
8070f5c0 3522 break;
12bb2edb 3523 case lttng_kernel_type_string:
437d5aa5
MD		 3524 ret = _lttng_string_type_statedump(session,
3525 lttng_kernel_get_type_string(type),
3526 nesting);
ceabb767 3527 break;
437d5aa5
MD		 3528 case lttng_kernel_type_struct:
3529 ret = _lttng_struct_type_statedump(session,
3530 lttng_kernel_get_type_struct(type),
3531 nesting);
8070f5c0 3532 break;
437d5aa5
MD		 3533 case lttng_kernel_type_variant:
3534 ret = _lttng_variant_type_statedump(session,
3535 lttng_kernel_get_type_variant(type),
51ef4536 3536 nesting, NULL);
ceabb767
MD		 3537 break;
3538
3539 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3540 case lttng_kernel_type_array:
3541 case lttng_kernel_type_sequence:
ceabb767
MD		 3542 default:
3543 WARN_ON_ONCE(1);
3544 return -EINVAL;
8070f5c0 3545 }
ceabb767
MD		 3546 return ret;
3547}
8070f5c0 3548
ceabb767
MD		 3549/*
3550 * Must be called with sessions_mutex held.
3551 */
3552static
8cdc1a81 3553int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3554 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3555 size_t nesting,
3556 const char **prev_field_name_p)
ceabb767 3557{
51ef4536 3558 const char *prev_field_name = NULL;
ceabb767 3559 int ret = 0;
27d2368e 3560
51ef4536
MD		 3561 if (prev_field_name_p)
3562 prev_field_name = *prev_field_name_p;
437d5aa5 3563 switch (field->type->type) {
12bb2edb 3564 case lttng_kernel_type_integer:
ceabb767
MD		 3565 ret = _lttng_integer_field_statedump(session, field, nesting);
3566 break;
437d5aa5 3567 case lttng_kernel_type_enum:
ceabb767 3568 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3569 break;
12bb2edb 3570 case lttng_kernel_type_string:
ceabb767 3571 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3572 break;
437d5aa5 3573 case lttng_kernel_type_struct:
ceabb767 3574 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3575 break;
437d5aa5 3576 case lttng_kernel_type_array:
ceabb767 3577 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3578 break;
437d5aa5 3579 case lttng_kernel_type_sequence:
51ef4536 3580 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3581 break;
437d5aa5 3582 case lttng_kernel_type_variant:
51ef4536 3583 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3584 break;
f513b2bf 3585
8070f5c0
MD		 3586 default:
3587 WARN_ON_ONCE(1);
3588 return -EINVAL;
3589 }
51ef4536
MD		 3590 if (prev_field_name_p)
3591 *prev_field_name_p = field->name;
8070f5c0
MD		 3592 return ret;
3593}
3594
3595static
8cdc1a81 3596int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3597 struct lttng_kernel_ctx *ctx)
8070f5c0 3598{
51ef4536 3599 const char *prev_field_name = NULL;
8070f5c0
MD		 3600 int ret = 0;
3601 int i;
3602
3603 if (!ctx)
3604 return 0;
3605 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3606 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3607
51ef4536 3608 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3609 if (ret)
3610 return ret;
3611 }
3612 return ret;
3613}
3614
3615static
8cdc1a81 3616int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3617 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3618{
51ef4536 3619 const char *prev_field_name = NULL;
a67ba386 3620 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3621 int ret = 0;
3622 int i;
3623
6c8c025b
MD		 3624 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3625 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3626
51ef4536 3627 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3628 if (ret)
3629 return ret;
c099397a
MD		 3630 }
3631 return ret;
3632}
3633
d83004aa
JD		 3634/*
3635 * Must be called with sessions_mutex held.
8b97fd42
MD		 3636 * The entire event metadata is printed as a single atomic metadata
3637 * transaction.
d83004aa 3638 */
c099397a 3639static
8cdc1a81 3640int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3641 struct lttng_kernel_channel_buffer *chan,
a67ba386 3642 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3643{
3644 int ret = 0;
3645
a67ba386 3646 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3647 return 0;
f7d06400 3648 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3649 return 0;
3650
8b97fd42
MD		 3651 lttng_metadata_begin(session);
3652
c099397a
MD		 3653 ret = lttng_metadata_printf(session,
3654 "event {\n"
ae734547 3655 " name = \"%s\";\n"
c099397a 3656 " id = %u;\n"
b9074a1b 3657 " stream_id = %u;\n",
a67ba386
MD		 3658 event_recorder->priv->parent.desc->event_name,
3659 event_recorder->priv->id,
f7d06400 3660 event_recorder->chan->priv->id);
c099397a
MD		 3661 if (ret)
3662 goto end;
3663
8070f5c0 3664 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3665 " fields := struct {\n"
3666 );
3667 if (ret)
3668 goto end;
3669
a67ba386 3670 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3671 if (ret)
3672 goto end;
3673
3674 /*
3675 * LTTng space reservation can only reserve multiples of the
3676 * byte size.
3677 */
3678 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3679 " };\n"
3680 "};\n\n");
c099397a
MD		 3681 if (ret)
3682 goto end;
3683
a67ba386 3684 event_recorder->priv->metadata_dumped = 1;
c099397a 3685end:
8b97fd42 3686 lttng_metadata_end(session);
c099397a
MD		 3687 return ret;
3688
3689}
3690
d83004aa
JD		 3691/*
3692 * Must be called with sessions_mutex held.
8b97fd42
MD		 3693 * The entire channel metadata is printed as a single atomic metadata
3694 * transaction.
d83004aa 3695 */
c099397a 3696static
8cdc1a81 3697int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3698 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3699{
3700 int ret = 0;
3701
f7d06400 3702 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3703 return 0;
d83004aa 3704
f7d06400 3705 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3706 return 0;
3707
8b97fd42
MD		 3708 lttng_metadata_begin(session);
3709
f7d06400 3710 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3711 ret = lttng_metadata_printf(session,
3712 "stream {\n"
3713 " id = %u;\n"
9115fbdc 3714 " event.header := %s;\n"
b9074a1b 3715 " packet.context := struct packet_context;\n",
f7d06400
MD		 3716 chan->priv->id,
3717 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3718 "struct event_header_large");
3719 if (ret)
3720 goto end;
3721
f7d06400 3722 if (chan->priv->ctx) {
b9074a1b
MD		 3723 ret = lttng_metadata_printf(session,
3724 " event.context := struct {\n");
3725 if (ret)
3726 goto end;
3727 }
f7d06400 3728 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3729 if (ret)
3730 goto end;
f7d06400 3731 if (chan->priv->ctx) {
b9074a1b
MD		 3732 ret = lttng_metadata_printf(session,
3733 " };\n");
3734 if (ret)
3735 goto end;
3736 }
8070f5c0
MD		 3737
3738 ret = lttng_metadata_printf(session,
b9074a1b 3739 "};\n\n");
8070f5c0 3740
f7d06400 3741 chan->priv->metadata_dumped = 1;
c099397a 3742end:
8b97fd42 3743 lttng_metadata_end(session);
c099397a
MD		 3744 return ret;
3745}
3746
d83004aa
JD		 3747/*
3748 * Must be called with sessions_mutex held.
3749 */
9115fbdc 3750static
8cdc1a81 3751int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3752{
3753 return lttng_metadata_printf(session,
3754 "struct packet_context {\n"
a3ccff4f
MD		 3755 " uint64_clock_monotonic_t timestamp_begin;\n"
3756 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3757 " uint64_t content_size;\n"
3758 " uint64_t packet_size;\n"
5b3cf4f9 3759 " uint64_t packet_seq_num;\n"
a9afe705 3760 " unsigned long events_discarded;\n"
9115fbdc 3761 " uint32_t cpu_id;\n"
c6dfdf6f 3762 "};\n\n"
9115fbdc
MD		 3763 );
3764}
3765
3766/*
3767 * Compact header:
3768 * id: range: 0 - 30.
3769 * id 31 is reserved to indicate an extended header.
3770 *
3771 * Large header:
3772 * id: range: 0 - 65534.
3773 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3774 *
3775 * Must be called with sessions_mutex held.
9115fbdc
MD		 3776 */
3777static
8cdc1a81 3778int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3779{
3780 return lttng_metadata_printf(session,
3781 "struct event_header_compact {\n"
3782 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3783 " variant <id> {\n"
3784 " struct {\n"
a3ccff4f 3785 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3786 " } compact;\n"
3787 " struct {\n"
3788 " uint32_t id;\n"
a3ccff4f 3789 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3790 " } extended;\n"
3791 " } v;\n"
3792 "} align(%u);\n"
3793 "\n"
3794 "struct event_header_large {\n"
3795 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3796 " variant <id> {\n"
3797 " struct {\n"
a3ccff4f 3798 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3799 " } compact;\n"
3800 " struct {\n"
3801 " uint32_t id;\n"
a3ccff4f 3802 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3803 " } extended;\n"
3804 " } v;\n"
3805 "} align(%u);\n\n",
a90917c3
MD		 3806 lttng_alignof(uint32_t) * CHAR_BIT,
3807 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3808 );
3809}
3810
a3ccff4f
MD		 3811 /*
3812 * Approximation of NTP time of day to clock monotonic correlation,
3813 * taken at start of trace.
3814 * Yes, this is only an approximation. Yes, we can (and will) do better
3815 * in future versions.
5283350b
MD		 3816 * This function may return a negative offset. It may happen if the
3817 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3818 *
3819 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3820 * y2038 compliant.
a3ccff4f
MD		 3821 */
3822static
8967b2a3 3823int64_t measure_clock_offset(void)
a3ccff4f 3824{
dcb93448 3825 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3826 uint64_t tcf = trace_clock_freq();
dcb93448 3827 int64_t offset;
a3ccff4f 3828 unsigned long flags;
3636085f
MJ		 3829#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3830 struct timespec64 rts = { 0, 0 };
3831#else
3832 struct timespec rts = { 0, 0 };
3833#endif
a3ccff4f
MD		 3834
3835 /* Disable interrupts to increase correlation precision. */
3836 local_irq_save(flags);
3837 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3838#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3839 ktime_get_real_ts64(&rts);
3840#else
216b6baa 3841 getnstimeofday(&rts);
3636085f 3842#endif
a3ccff4f
MD		 3843 monotonic[1] = trace_clock_read64();
3844 local_irq_restore(flags);
3845
dcb93448 3846 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3847 realtime = (uint64_t) rts.tv_sec * tcf;
3848 if (tcf == NSEC_PER_SEC) {
3849 realtime += rts.tv_nsec;
3850 } else {
3851 uint64_t n = rts.tv_nsec * tcf;
3852
3853 do_div(n, NSEC_PER_SEC);
3854 realtime += n;
3855 }
dcb93448 3856 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3857 return offset;
3858}
3859
3eb95be4 3860static
8cdc1a81 3861int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3862{
0f3eaad4 3863 int ret = 0;
3eb95be4
JR		 3864 size_t i;
3865 char cur;
3866
3867 i = 0;
3868 cur = string[i];
3869 while (cur != '\0') {
3870 switch (cur) {
3871 case '\n':
3872 ret = lttng_metadata_printf(session, "%s", "\\n");
3873 break;
3874 case '\\':
3875 case '"':
3876 ret = lttng_metadata_printf(session, "%c", '\\');
3877 if (ret)
3878 goto error;
3879 /* We still print the current char */
3880 /* Fallthrough */
3881 default:
3882 ret = lttng_metadata_printf(session, "%c", cur);
3883 break;
3884 }
3885
3886 if (ret)
3887 goto error;
3888
3889 cur = string[++i];
3890 }
3891error:
3892 return ret;
3893}
3894
3895static
8cdc1a81 3896int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3897 const char *field_value)
3eb95be4
JR		 3898{
3899 int ret;
3900
1c88f269 3901 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3902 if (ret)
3903 goto error;
3904
1c88f269 3905 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3906 if (ret)
3907 goto error;
3908
3909 ret = lttng_metadata_printf(session, "\";\n");
3910
3911error:
3912 return ret;
3913}
3914
c099397a
MD		 3915/*
3916 * Output metadata into this session's metadata buffers.
d83004aa 3917 * Must be called with sessions_mutex held.
c099397a
MD		 3918 */
3919static
8cdc1a81 3920int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3921{
8cdc1a81 3922 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3923 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3924 const char *product_uuid;
f7d06400 3925 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3926 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3927 int ret = 0;
3928
585e5dcc 3929 if (!LTTNG_READ_ONCE(session->active))
c099397a 3930 return 0;
8b97fd42
MD		 3931
3932 lttng_metadata_begin(session);
3933
8cdc1a81 3934 if (session->priv->metadata_dumped)
c099397a 3935 goto skip_session;
c099397a 3936
d793d5e1 3937 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3938 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3939 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3940 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3941 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3942 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3943
3944 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3945 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3946 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3947 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3948 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3949 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3950 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3951 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3952 "\n"
3953 "trace {\n"
3954 " major = %u;\n"
3955 " minor = %u;\n"
30bdb6e4 3956 " uuid = \"%s\";\n"
d793d5e1
MD		 3957 " byte_order = %s;\n"
3958 " packet.header := struct {\n"
3959 " uint32_t magic;\n"
1ec3f75a 3960 " uint8_t uuid[16];\n"
d793d5e1 3961 " uint32_t stream_id;\n"
5594698f 3962 " uint64_t stream_instance_id;\n"
0eb25f58 3963 " };\n"
d793d5e1 3964 "};\n\n",
a90917c3
MD		 3965 lttng_alignof(uint8_t) * CHAR_BIT,
3966 lttng_alignof(uint16_t) * CHAR_BIT,
3967 lttng_alignof(uint32_t) * CHAR_BIT,
3968 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3969 sizeof(unsigned long) * CHAR_BIT,
3970 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3971 CTF_SPEC_MAJOR,
3972 CTF_SPEC_MINOR,
d793d5e1 3973 uuid_s,
5214fa50 3974#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3975 "be"
3976#else
3977 "le"
3978#endif
3979 );
3980 if (ret)
3981 goto end;
3982
99dc9597
MD		 3983 ret = lttng_metadata_printf(session,
3984 "env {\n"
a6058143 3985 " hostname = \"%s\";\n"
c6c9e10f 3986 " domain = \"kernel\";\n"
99dc9597 3987 " sysname = \"%s\";\n"
c6c9e10f
MD		 3988 " kernel_release = \"%s\";\n"
3989 " kernel_version = \"%s\";\n"
3990 " tracer_name = \"lttng-modules\";\n"
3991 " tracer_major = %d;\n"
3992 " tracer_minor = %d;\n"
3993 " tracer_patchlevel = %d;\n"
3eb95be4 3994 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3995 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3996 utsname()->sysname,
3997 utsname()->release,
c6c9e10f
MD		 3998 utsname()->version,
3999 LTTNG_MODULES_MAJOR_VERSION,
4000 LTTNG_MODULES_MINOR_VERSION,
4001 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 4002 );
4003 if (ret)
4004 goto end;
4005
8cdc1a81 4006 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4007 if (ret)
4008 goto end;
4009 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4010 session->priv->creation_time);
3eb95be4
JR		 4011 if (ret)
4012 goto end;
4013
c88f762e
GB		 4014 /* Add the product UUID to the 'env' section */
4015 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4016 if (product_uuid) {
4017 ret = lttng_metadata_printf(session,
4018 " product_uuid = \"%s\";\n",
4019 product_uuid
4020 );
4021 if (ret)
4022 goto end;
4023 }
4024
4025 /* Close the 'env' section */
3eb95be4
JR		 4026 ret = lttng_metadata_printf(session, "};\n\n");
4027 if (ret)
4028 goto end;
4029
a3ccff4f
MD		 4030 ret = lttng_metadata_printf(session,
4031 "clock {\n"
2754583e
MD		 4032 " name = \"%s\";\n",
4033 trace_clock_name()
a82c63f1
MD		 4034 );
4035 if (ret)
4036 goto end;
4037
4038 if (!trace_clock_uuid(clock_uuid_s)) {
4039 ret = lttng_metadata_printf(session,
7c27cb17 4040 " uuid = \"%s\";\n",
a82c63f1
MD		 4041 clock_uuid_s
4042 );
4043 if (ret)
4044 goto end;
4045 }
4046
4047 ret = lttng_metadata_printf(session,
2754583e 4048 " description = \"%s\";\n"
a3ccff4f
MD		 4049 " freq = %llu; /* Frequency, in Hz */\n"
4050 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4051 " offset = %lld;\n"
a3ccff4f 4052 "};\n\n",
2754583e 4053 trace_clock_description(),
a3ccff4f 4054 (unsigned long long) trace_clock_freq(),
8967b2a3 4055 (long long) measure_clock_offset()
a3ccff4f
MD		 4056 );
4057 if (ret)
4058 goto end;
4059
4060 ret = lttng_metadata_printf(session,
4061 "typealias integer {\n"
4062 " size = 27; align = 1; signed = false;\n"
2754583e 4063 " map = clock.%s.value;\n"
a3ccff4f
MD		 4064 "} := uint27_clock_monotonic_t;\n"
4065 "\n"
4066 "typealias integer {\n"
4067 " size = 32; align = %u; signed = false;\n"
2754583e 4068 " map = clock.%s.value;\n"
a3ccff4f
MD		 4069 "} := uint32_clock_monotonic_t;\n"
4070 "\n"
4071 "typealias integer {\n"
4072 " size = 64; align = %u; signed = false;\n"
2754583e 4073 " map = clock.%s.value;\n"
a3ccff4f 4074 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4075 trace_clock_name(),
a3ccff4f 4076 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4077 trace_clock_name(),
4078 lttng_alignof(uint64_t) * CHAR_BIT,
4079 trace_clock_name()
a3ccff4f
MD		 4080 );
4081 if (ret)
4082 goto end;
4083
a90917c3 4084 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4085 if (ret)
4086 goto end;
4087
a90917c3 4088 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4089 if (ret)
4090 goto end;
4091
c099397a 4092skip_session:
f7d06400
MD		 4093 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4094 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4095 if (ret)
4096 goto end;
4097 }
4098
8cdc1a81 4099 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386
MD		 4100 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4101 event_recorder_priv->pub);
c099397a
MD		 4102 if (ret)
4103 goto end;
4104 }
8cdc1a81 4105 session->priv->metadata_dumped = 1;
c099397a 4106end:
8b97fd42 4107 lttng_metadata_end(session);
c099397a
MD		 4108 return ret;
4109}
4110
c0e31d2e 4111/**
a90917c3 4112 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4113 * @transport: transport structure
4114 *
4115 * Registers a transport which can be used as output to extract the data out of
4116 * LTTng. The module calling this registration function must ensure that no
4117 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4118 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4119 * is made visible to the transport function. This registration acts as a
263b6c88 4120 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4121 * after its registration must it synchronize the TLBs.
4122 */
a90917c3 4123void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4124{
4125 /*
4126 * Make sure no page fault can be triggered by the module about to be
4127 * registered. We deal with this here so we don't have to call
263b6c88 4128 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4129 */
263b6c88 4130 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4131
4132 mutex_lock(&sessions_mutex);
a90917c3 4133 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4134 mutex_unlock(&sessions_mutex);
4135}
a90917c3 4136EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4137
4138/**
a90917c3 4139 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4140 * @transport: transport structure
4141 */
a90917c3 4142void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4143{
4144 mutex_lock(&sessions_mutex);
4145 list_del(&transport->node);
4146 mutex_unlock(&sessions_mutex);
4147}
a90917c3 4148EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4149
a101fa10
MD		 4150void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4151{
4152 /*
4153 * Make sure no page fault can be triggered by the module about to be
4154 * registered. We deal with this here so we don't have to call
4155 * vmalloc_sync_mappings() in each module's init.
4156 */
4157 wrapper_vmalloc_sync_mappings();
4158
4159 mutex_lock(&sessions_mutex);
4160 list_add_tail(&transport->node, &lttng_counter_transport_list);
4161 mutex_unlock(&sessions_mutex);
4162}
4163EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4164
4165void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4166{
4167 mutex_lock(&sessions_mutex);
4168 list_del(&transport->node);
4169 mutex_unlock(&sessions_mutex);
4170}
4171EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4172
5f4c791e 4173#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4174
4175enum cpuhp_state lttng_hp_prepare;
4176enum cpuhp_state lttng_hp_online;
4177
4178static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4179{
4180 struct lttng_cpuhp_node *lttng_node;
4181
4182 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4183 switch (lttng_node->component) {
4184 case LTTNG_RING_BUFFER_FRONTEND:
4185 return 0;
4186 case LTTNG_RING_BUFFER_BACKEND:
4187 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4188 case LTTNG_RING_BUFFER_ITER:
4189 return 0;
4190 case LTTNG_CONTEXT_PERF_COUNTERS:
4191 return 0;
4192 default:
4193 return -EINVAL;
4194 }
4195}
4196
4197static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4198{
4199 struct lttng_cpuhp_node *lttng_node;
4200
4201 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4202 switch (lttng_node->component) {
4203 case LTTNG_RING_BUFFER_FRONTEND:
4204 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4205 case LTTNG_RING_BUFFER_BACKEND:
4206 return 0;
4207 case LTTNG_RING_BUFFER_ITER:
4208 return 0;
4209 case LTTNG_CONTEXT_PERF_COUNTERS:
4210 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4211 default:
4212 return -EINVAL;
4213 }
4214}
4215
4216static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4217{
4218 struct lttng_cpuhp_node *lttng_node;
4219
4220 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4221 switch (lttng_node->component) {
4222 case LTTNG_RING_BUFFER_FRONTEND:
4223 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4224 case LTTNG_RING_BUFFER_BACKEND:
4225 return 0;
4226 case LTTNG_RING_BUFFER_ITER:
4227 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4228 case LTTNG_CONTEXT_PERF_COUNTERS:
4229 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4230 default:
4231 return -EINVAL;
4232 }
4233}
4234
4235static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4236{
4237 struct lttng_cpuhp_node *lttng_node;
4238
4239 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4240 switch (lttng_node->component) {
4241 case LTTNG_RING_BUFFER_FRONTEND:
4242 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4243 case LTTNG_RING_BUFFER_BACKEND:
4244 return 0;
4245 case LTTNG_RING_BUFFER_ITER:
4246 return 0;
4247 case LTTNG_CONTEXT_PERF_COUNTERS:
4248 return 0;
4249 default:
4250 return -EINVAL;
4251 }
4252}
4253
4254static int __init lttng_init_cpu_hotplug(void)
4255{
4256 int ret;
4257
4258 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4259 lttng_hotplug_prepare,
4260 lttng_hotplug_dead);
4261 if (ret < 0) {
4262 return ret;
4263 }
4264 lttng_hp_prepare = ret;
4265 lttng_rb_set_hp_prepare(ret);
4266
4267 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4268 lttng_hotplug_online,
4269 lttng_hotplug_offline);
4270 if (ret < 0) {
4271 cpuhp_remove_multi_state(lttng_hp_prepare);
4272 lttng_hp_prepare = 0;
4273 return ret;
4274 }
4275 lttng_hp_online = ret;
4276 lttng_rb_set_hp_online(ret);
4277
4278 return 0;
4279}
4280
4281static void __exit lttng_exit_cpu_hotplug(void)
4282{
4283 lttng_rb_set_hp_online(0);
4284 cpuhp_remove_multi_state(lttng_hp_online);
4285 lttng_rb_set_hp_prepare(0);
4286 cpuhp_remove_multi_state(lttng_hp_prepare);
4287}
4288
5f4c791e 4289#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4290static int lttng_init_cpu_hotplug(void)
4291{
4292 return 0;
4293}
4294static void lttng_exit_cpu_hotplug(void)
4295{
4296}
5f4c791e 4297#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4298
a90917c3 4299static int __init lttng_events_init(void)
4e3c1b9b 4300{
1c25284c
MD		 4301 int ret;
4302
453b2495
JD		 4303 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4304 if (ret)
4305 return ret;
389d7070 4306 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4307 if (ret)
4308 return ret;
4309 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4310 if (ret)
4311 return ret;
4312 ret = lttng_probes_init();
389d7070
MD		 4313 if (ret)
4314 return ret;
07dfc1d0 4315 ret = lttng_context_init();
20591cf7
MD		 4316 if (ret)
4317 return ret;
07dfc1d0
MD		 4318 ret = lttng_tracepoint_init();
4319 if (ret)
4320 goto error_tp;
a67ba386
MD		 4321 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4322 if (!event_recorder_cache) {
20591cf7 4323 ret = -ENOMEM;
a67ba386 4324 goto error_kmem_event_recorder;
dffef45d 4325 }
a67ba386
MD		 4326 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4327 if (!event_recorder_private_cache) {
4328 ret = -ENOMEM;
4329 goto error_kmem_event_recorder_private;
4330 }
4331 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4332 if (!event_notifier_cache) {
4333 ret = -ENOMEM;
4334 goto error_kmem_event_notifier;
20591cf7 4335 }
a67ba386
MD		 4336 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4337 if (!event_notifier_private_cache) {
4338 ret = -ENOMEM;
4339 goto error_kmem_event_notifier_private;
4340 }
80996790 4341 ret = lttng_abi_init();
02119ee5
MD		 4342 if (ret)
4343 goto error_abi;
0c956676
MD		 4344 ret = lttng_logger_init();
4345 if (ret)
4346 goto error_logger;
1e367326
MD		 4347 ret = lttng_init_cpu_hotplug();
4348 if (ret)
4349 goto error_hotplug;
101215b7 4350 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4351 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4352 __stringify(LTTNG_MODULES_MINOR_VERSION),
4353 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4354 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4355 LTTNG_VERSION_NAME,
4356#ifdef LTTNG_EXTRA_VERSION_GIT
4357 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4358#else
4359 "",
4360#endif
4361#ifdef LTTNG_EXTRA_VERSION_NAME
4362 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4363#else
4364 "");
4365#endif
c1551e57
MJ		 4366#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4367 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4368#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4369 return 0;
0c956676 4370
1e367326
MD		 4371error_hotplug:
4372 lttng_logger_exit();
0c956676
MD		 4373error_logger:
4374 lttng_abi_exit();
02119ee5 4375error_abi:
a67ba386
MD		 4376 kmem_cache_destroy(event_notifier_private_cache);
4377error_kmem_event_notifier_private:
dffef45d
FD		 4378 kmem_cache_destroy(event_notifier_cache);
4379error_kmem_event_notifier:
a67ba386
MD		 4380 kmem_cache_destroy(event_recorder_private_cache);
4381error_kmem_event_recorder_private:
4382 kmem_cache_destroy(event_recorder_cache);
4383error_kmem_event_recorder:
20591cf7 4384 lttng_tracepoint_exit();
07dfc1d0
MD		 4385error_tp:
4386 lttng_context_exit();
101215b7 4387 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4388 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4389 __stringify(LTTNG_MODULES_MINOR_VERSION),
4390 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4391 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4392 LTTNG_VERSION_NAME,
4393#ifdef LTTNG_EXTRA_VERSION_GIT
4394 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4395#else
4396 "",
4397#endif
4398#ifdef LTTNG_EXTRA_VERSION_NAME
4399 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4400#else
4401 "");
4402#endif
1c25284c 4403 return ret;
4e3c1b9b
MD		 4404}
4405
a90917c3 4406module_init(lttng_events_init);
11b5a3c2 4407
a90917c3 4408static void __exit lttng_events_exit(void)
4e3c1b9b 4409{
8cdc1a81 4410 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4411
1e367326 4412 lttng_exit_cpu_hotplug();
0c956676 4413 lttng_logger_exit();
80996790 4414 lttng_abi_exit();
8cdc1a81
MD		 4415 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4416 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4417 kmem_cache_destroy(event_recorder_cache);
4418 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4419 kmem_cache_destroy(event_notifier_cache);
a67ba386 4420 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4421 lttng_tracepoint_exit();
07dfc1d0 4422 lttng_context_exit();
101215b7 4423 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4424 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4425 __stringify(LTTNG_MODULES_MINOR_VERSION),
4426 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4427 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4428 LTTNG_VERSION_NAME,
4429#ifdef LTTNG_EXTRA_VERSION_GIT
4430 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4431#else
4432 "",
4433#endif
4434#ifdef LTTNG_EXTRA_VERSION_NAME
4435 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4436#else
4437 "");
4438#endif
4e3c1b9b 4439}
92e94819 4440
a90917c3 4441module_exit(lttng_events_exit);
11b5a3c2 4442
7ca11e77 4443#include <generated/patches.h>
101215b7
MJ		 4444#ifdef LTTNG_EXTRA_VERSION_GIT
4445MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4446#endif
4447#ifdef LTTNG_EXTRA_VERSION_NAME
4448MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4449#endif
92e94819
MD		 4450MODULE_LICENSE("GPL and additional rights");
4451MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4452MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4453MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4454 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4455 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4456 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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