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Refactoring: combine lttng_create_syscall_event_if_missing common code
[lttng-modules.git] / src / lttng-events.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
a90917c3 3 * lttng-events.c
4e3c1b9b 4 *
4e3c1b9b 5 * Holds LTTng per-session event registry.
17baffe2 6 *
886d51a3 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4e3c1b9b
MD		 8 */
9
389d7070
MD		 10/*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14#include "wrapper/page_alloc.h"
15
4e3c1b9b 16#include <linux/module.h>
c0e31d2e
MD		 17#include <linux/mutex.h>
18#include <linux/sched.h>
11b5a3c2 19#include <linux/slab.h>
c099397a 20#include <linux/jiffies.h>
99dc9597 21#include <linux/utsname.h>
abc0446a 22#include <linux/err.h>
7e6f9ef6
MD		 23#include <linux/seq_file.h>
24#include <linux/file.h>
25#include <linux/anon_inodes.h>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
c190d76e 31#include <wrapper/compiler_attributes.h>
a7008254 32#include <wrapper/uuid.h>
263b6c88 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 34#include <wrapper/random.h>
35#include <wrapper/tracepoint.h>
36#include <wrapper/list.h>
cbc19040 37#include <wrapper/types.h>
2df37e95
MD		 38#include <lttng/kernel-version.h>
39#include <lttng/events.h>
92bc1e23 40#include <lttng/events-internal.h>
0b365677 41#include <lttng/lttng-bytecode.h>
2df37e95 42#include <lttng/tracer.h>
21f58fb7 43#include <lttng/event-notifier-notification.h>
2df37e95
MD		 44#include <lttng/abi-old.h>
45#include <lttng/endian.h>
46#include <lttng/string-utils.h>
4a11ef1c 47#include <lttng/utils.h>
24591303
MD		 48#include <ringbuffer/backend.h>
49#include <ringbuffer/frontend.h>
3636085f 50#include <wrapper/time.h>
4e3c1b9b 51
d83004aa
JD		 52#define METADATA_CACHE_DEFAULT_SIZE 4096
53
4e3c1b9b 54static LIST_HEAD(sessions);
750b05f2 55static LIST_HEAD(event_notifier_groups);
a90917c3 56static LIST_HEAD(lttng_transport_list);
a101fa10 57static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 58/*
59 * Protect the sessions and metadata caches.
60 */
4e3c1b9b 61static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 62static struct kmem_cache *event_recorder_cache;
63static struct kmem_cache *event_recorder_private_cache;
dffef45d 64static struct kmem_cache *event_notifier_cache;
a67ba386 65static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 66
8cdc1a81
MD		 67static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
68static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b01155ba 69static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
7b25ab0e 70static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler);
3c997079 71
0648898e 72static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
f7d06400 73static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
96c59af1 74static int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder *event);
a67ba386 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;
44b1abdc 357 struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler;
dda6a249 358 int ret;
4e3c1b9b
MD		 359
360 mutex_lock(&sessions_mutex);
a8f2d0c7 361 WRITE_ONCE(session->active, 0);
f7d06400 362 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 363 ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table);
1ec65de1
MD		 364 WARN_ON(ret);
365 }
8cdc1a81 366 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
96c59af1 367 ret = _lttng_event_recorder_unregister(event_recorder_priv->pub);
dda6a249
MD		 368 WARN_ON(ret);
369 }
abcca994 370 synchronize_trace(); /* Wait for in-flight events to complete */
f7d06400 371 list_for_each_entry(chan_priv, &session->priv->chan, node) {
6053e75e 372 ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table);
badfe9f5
MD		 373 WARN_ON(ret);
374 }
44b1abdc 375 list_for_each_entry_safe(event_recorder_enabler, tmp_event_recorder_enabler,
8cdc1a81 376 &session->priv->enablers_head, node)
44b1abdc 377 lttng_event_enabler_destroy(&event_recorder_enabler->parent);
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
6053e75e 413 ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table);
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
6053e75e
MD		 427 ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table);
428 WARN_ON(ret);
8a8ac9a8 429
dffef45d
FD		 430 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
431 &event_notifier_group->enablers_head, node)
44b1abdc 432 lttng_event_enabler_destroy(&event_notifier_enabler->parent);
dffef45d 433
a67ba386
MD		 434 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
435 &event_notifier_group->event_notifiers_head, node)
0648898e 436 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 437
99f52fcc
FD		 438 if (event_notifier_group->error_counter) {
439 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 440
99f52fcc
FD		 441 error_counter->ops->counter_destroy(error_counter->counter);
442 module_put(error_counter->transport->owner);
443 lttng_kvfree(error_counter);
444 event_notifier_group->error_counter = NULL;
445 }
446
4a399b76 447 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 448 module_put(event_notifier_group->transport->owner);
449 list_del(&event_notifier_group->node);
dffef45d 450
750b05f2
FD		 451 mutex_unlock(&sessions_mutex);
452 lttng_kvfree(event_notifier_group);
453}
454
8cdc1a81 455int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 456{
457 int ret;
458
459 mutex_lock(&sessions_mutex);
460 ret = lttng_statedump_start(session);
461 mutex_unlock(&sessions_mutex);
462 return ret;
463}
464
8cdc1a81 465int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 466{
467 int ret = 0;
f7d06400 468 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 469
470 mutex_lock(&sessions_mutex);
471 if (session->active) {
472 ret = -EBUSY;
473 goto end;
474 }
c099397a 475
3c997079 476 /* Set transient enabler state to "enabled" */
8cdc1a81 477 session->priv->tstate = 1;
3c997079 478
4ef81e4a 479 /* We need to sync enablers with session before activation. */
b2bc0bc8 480 lttng_session_sync_event_enablers(session);
4ef81e4a 481
c099397a
MD		 482 /*
483 * Snapshot the number of events per channel to know the type of header
484 * we need to use.
485 */
f7d06400
MD		 486 list_for_each_entry(chan_priv, &session->priv->chan, node) {
487 if (chan_priv->header_type)
488 continue; /* don't change it if session stop/restart */
489 if (chan_priv->free_event_id < 31)
490 chan_priv->header_type = 1; /* compact */
c099397a 491 else
f7d06400 492 chan_priv->header_type = 2; /* large */
c099397a
MD		 493 }
494
64af2437 495 /* Clear each stream's quiescent state. */
f7d06400
MD		 496 list_for_each_entry(chan_priv, &session->priv->chan, node) {
497 if (chan_priv->channel_type != METADATA_CHANNEL)
498 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 499 }
64af2437 500
a8f2d0c7 501 WRITE_ONCE(session->active, 1);
8cdc1a81 502 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 503 ret = _lttng_session_metadata_statedump(session);
c337ddc2 504 if (ret) {
a8f2d0c7 505 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 506 goto end;
507 }
508 ret = lttng_statedump_start(session);
360f38ea 509 if (ret)
a8f2d0c7 510 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 511end:
512 mutex_unlock(&sessions_mutex);
11b5a3c2 513 return ret;
c0e31d2e
MD		 514}
515
8cdc1a81 516int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 517{
518 int ret = 0;
f7d06400 519 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 520
521 mutex_lock(&sessions_mutex);
522 if (!session->active) {
523 ret = -EBUSY;
524 goto end;
525 }
a8f2d0c7 526 WRITE_ONCE(session->active, 0);
3c997079
MD		 527
528 /* Set transient enabler state to "disabled" */
8cdc1a81 529 session->priv->tstate = 0;
b2bc0bc8 530 lttng_session_sync_event_enablers(session);
64af2437
MD		 531
532 /* Set each stream's quiescent state. */
f7d06400
MD		 533 list_for_each_entry(chan_priv, &session->priv->chan, node) {
534 if (chan_priv->channel_type != METADATA_CHANNEL)
535 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 536 }
c0e31d2e
MD		 537end:
538 mutex_unlock(&sessions_mutex);
11b5a3c2 539 return ret;
c0e31d2e
MD		 540}
541
8cdc1a81 542int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 543{
544 int ret = 0;
f7d06400 545 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 546 struct lttng_kernel_event_recorder_private *event_recorder_priv;
8cdc1a81 547 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 548 struct lttng_metadata_stream *stream;
549
550 mutex_lock(&sessions_mutex);
551 if (!session->active) {
552 ret = -EBUSY;
553 goto end;
554 }
555
556 mutex_lock(&cache->lock);
557 memset(cache->data, 0, cache->cache_alloc);
558 cache->metadata_written = 0;
559 cache->version++;
8cdc1a81 560 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 561 stream->metadata_out = 0;
562 stream->metadata_in = 0;
563 }
564 mutex_unlock(&cache->lock);
565
8cdc1a81 566 session->priv->metadata_dumped = 0;
f7d06400
MD		 567 list_for_each_entry(chan_priv, &session->priv->chan, node) {
568 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 569 }
570
8cdc1a81 571 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 572 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 573 }
574
575 ret = _lttng_session_metadata_statedump(session);
576
577end:
578 mutex_unlock(&sessions_mutex);
579 return ret;
580}
581
6b757027
MD		 582static
583bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel)
584{
585 struct lttng_kernel_channel_buffer *chan_buf;
586
587 if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER)
588 return false;
589 chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent);
590 if (chan_buf->priv->channel_type == METADATA_CHANNEL)
591 return true;
592 return false;
593}
594
595int lttng_channel_enable(struct lttng_kernel_channel_common *channel)
e64957da 596{
3c997079 597 int ret = 0;
e64957da 598
3c997079 599 mutex_lock(&sessions_mutex);
6b757027 600 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 601 ret = -EPERM;
602 goto end;
603 }
6b757027 604 if (channel->enabled) {
3c997079
MD		 605 ret = -EEXIST;
606 goto end;
607 }
608 /* Set transient enabler state to "enabled" */
6b757027
MD		 609 channel->priv->tstate = 1;
610 lttng_session_sync_event_enablers(channel->session);
3c997079 611 /* Set atomically the state to "enabled" */
6b757027 612 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 613end:
614 mutex_unlock(&sessions_mutex);
615 return ret;
e64957da
MD		 616}
617
6b757027 618int lttng_channel_disable(struct lttng_kernel_channel_common *channel)
e64957da 619{
3c997079 620 int ret = 0;
e64957da 621
3c997079 622 mutex_lock(&sessions_mutex);
6b757027 623 if (is_channel_buffer_metadata(channel)) {
3c997079
MD		 624 ret = -EPERM;
625 goto end;
626 }
6b757027 627 if (!channel->enabled) {
3c997079
MD		 628 ret = -EEXIST;
629 goto end;
630 }
631 /* Set atomically the state to "disabled" */
6b757027 632 WRITE_ONCE(channel->enabled, 0);
3c997079 633 /* Set transient enabler state to "enabled" */
6b757027
MD		 634 channel->priv->tstate = 0;
635 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 636end:
637 mutex_unlock(&sessions_mutex);
638 return ret;
e64957da
MD		 639}
640
9d993668 641int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 642{
3c997079 643 int ret = 0;
e64957da 644
3c997079 645 mutex_lock(&sessions_mutex);
9d993668
MD		 646 switch (event->type) {
647 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
648 {
649 struct lttng_kernel_event_recorder *event_recorder =
650 container_of(event, struct lttng_kernel_event_recorder, parent);
651
f7d06400 652 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 653 ret = -EPERM;
654 goto end;
655 }
a0493bef 656 break;
9d993668
MD		 657 }
658 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
659 switch (event->priv->instrumentation) {
660 case LTTNG_KERNEL_ABI_KRETPROBE:
661 ret = -EINVAL;
662 goto end;
663 default:
664 break;
665 }
a0493bef
MD		 666 break;
667 default:
9d993668 668 break;
a0493bef 669 }
e64957da 670
9d993668 671 if (event->enabled) {
3c997079
MD		 672 ret = -EEXIST;
673 goto end;
674 }
a67ba386 675 switch (event->priv->instrumentation) {
c190d76e
MJ		 676 case LTTNG_KERNEL_ABI_TRACEPOINT:
677 lttng_fallthrough;
606828e4 678 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 679 ret = -EINVAL;
680 break;
b4a75708 681
c190d76e
MJ		 682 case LTTNG_KERNEL_ABI_KPROBE:
683 lttng_fallthrough;
606828e4 684 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 685 WRITE_ONCE(event->enabled, 1);
a0493bef 686 break;
b4a75708 687
606828e4 688 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 689 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 690 break;
b4a75708 691
c190d76e
MJ		 692 case LTTNG_KERNEL_ABI_FUNCTION:
693 lttng_fallthrough;
694 case LTTNG_KERNEL_ABI_NOOP:
695 lttng_fallthrough;
a0493bef
MD		 696 default:
697 WARN_ON_ONCE(1);
698 ret = -EINVAL;
699 }
3c997079
MD		 700end:
701 mutex_unlock(&sessions_mutex);
702 return ret;
e64957da
MD		 703}
704
9d993668 705int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 706{
707 int ret = 0;
708
709 mutex_lock(&sessions_mutex);
9d993668
MD		 710 switch (event->type) {
711 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
712 {
713 struct lttng_kernel_event_recorder *event_recorder =
714 container_of(event, struct lttng_kernel_event_recorder, parent);
715
f7d06400 716 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 717 ret = -EPERM;
718 goto end;
719 }
b01155ba 720 break;
9d993668
MD		 721 }
722 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
723 switch (event->priv->instrumentation) {
724 case LTTNG_KERNEL_ABI_KRETPROBE:
725 ret = -EINVAL;
726 goto end;
727 default:
728 break;
729 }
2b16f0c9 730 break;
dffef45d 731 default:
9d993668 732 break;
dffef45d 733 }
dffef45d 734
a67ba386 735 if (!event->enabled) {
dffef45d
FD		 736 ret = -EEXIST;
737 goto end;
738 }
a67ba386 739 switch (event->priv->instrumentation) {
c190d76e
MJ		 740 case LTTNG_KERNEL_ABI_TRACEPOINT:
741 lttng_fallthrough;
606828e4 742 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 743 ret = -EINVAL;
744 break;
b4a75708 745
c190d76e
MJ		 746 case LTTNG_KERNEL_ABI_KPROBE:
747 lttng_fallthrough;
606828e4 748 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 749 WRITE_ONCE(event->enabled, 0);
2b16f0c9 750 break;
b4a75708 751
9d993668
MD		 752 case LTTNG_KERNEL_ABI_KRETPROBE:
753 ret = lttng_kretprobes_event_enable_state(event, 0);
754 break;
755
c190d76e
MJ		 756 case LTTNG_KERNEL_ABI_FUNCTION:
757 lttng_fallthrough;
758 case LTTNG_KERNEL_ABI_NOOP:
759 lttng_fallthrough;
dffef45d
FD		 760 default:
761 WARN_ON_ONCE(1);
762 ret = -EINVAL;
763 }
764end:
765 mutex_unlock(&sessions_mutex);
766 return ret;
767}
768
4e252d1e 769struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 770 const char *transport_name,
771 void *buf_addr,
4e3c1b9b
MD		 772 size_t subbuf_size, size_t num_subbuf,
773 unsigned int switch_timer_interval,
d83004aa
JD		 774 unsigned int read_timer_interval,
775 enum channel_type channel_type)
4e3c1b9b 776{
f7d06400
MD		 777 struct lttng_kernel_channel_buffer *chan;
778 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 779 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 780
781 mutex_lock(&sessions_mutex);
8cdc1a81 782 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 783 goto active; /* Refuse to add channel to active session */
a90917c3 784 transport = lttng_transport_find(transport_name);
f3d01b96 785 if (!transport) {
5a15f70c 786 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 787 transport_name);
c0e31d2e 788 goto notransport;
f3d01b96 789 }
a33c9927 790 if (!try_module_get(transport->owner)) {
5a15f70c 791 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 792 goto notransport;
793 }
f7d06400 794 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 795 if (!chan)
c0e31d2e 796 goto nomem;
f7d06400
MD		 797 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
798 if (!chan_priv)
799 goto nomem_priv;
800 chan->priv = chan_priv;
801 chan_priv->pub = chan;
802 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
803 chan->parent.session = session;
804 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 805 chan->ops = &transport->ops;
125b4df4
MD		 806 /*
807 * Note: the channel creation op already writes into the packet
808 * headers. Therefore the "chan" information used as input
809 * should be already accessible.
810 */
f7d06400 811 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 812 chan, buf_addr, subbuf_size, num_subbuf,
813 switch_timer_interval, read_timer_interval);
f7d06400 814 if (!chan->priv->rb_chan)
f3d01b96 815 goto create_error;
f7d06400
MD		 816 chan->priv->parent.tstate = 1;
817 chan->parent.enabled = 1;
818 chan->priv->transport = transport;
819 chan->priv->channel_type = channel_type;
820 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 821 mutex_unlock(&sessions_mutex);
822 return chan;
823
f3d01b96 824create_error:
f7d06400
MD		 825 kfree(chan_priv);
826nomem_priv:
f3d01b96 827 kfree(chan);
c0e31d2e 828nomem:
a33c9927
MD		 829 if (transport)
830 module_put(transport->owner);
c0e31d2e 831notransport:
e5382b6d 832active:
4e3c1b9b
MD		 833 mutex_unlock(&sessions_mutex);
834 return NULL;
835}
836
837/*
d83004aa
JD		 838 * Only used internally at session destruction for per-cpu channels, and
839 * when metadata channel is released.
840 * Needs to be called with sessions mutex held.
4e3c1b9b 841 */
aa7c23a9 842static
f7d06400 843void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 844{
f7d06400
MD		 845 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
846 module_put(chan->priv->transport->owner);
847 list_del(&chan->priv->node);
848 lttng_kernel_destroy_context(chan->priv->ctx);
849 kfree(chan->priv);
4e3c1b9b
MD		 850 kfree(chan);
851}
852
f7d06400 853void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 854{
f7d06400 855 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 856
857 /* Protect the metadata cache with the sessions_mutex. */
858 mutex_lock(&sessions_mutex);
859 _lttng_channel_destroy(chan);
860 mutex_unlock(&sessions_mutex);
861}
862EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
863
864static
865void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
866{
867 stream->finalized = 1;
868 wake_up_interruptible(&stream->read_wait);
869}
870
a101fa10 871
e5382b6d
MD		 872/*
873 * Supports event creation while tracing session is active.
3c997079 874 * Needs to be called with sessions mutex held.
e5382b6d 875 */
1ae083ba 876struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 877 const struct lttng_kernel_event_desc *event_desc)
4e3c1b9b 878{
def1e304 879 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
5b9817ae 880 struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param;
def1e304 881 enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation;
f7d06400 882 struct lttng_kernel_session *session = chan->parent.session;
a67ba386
MD		 883 struct lttng_kernel_event_recorder *event_recorder;
884 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 885 const char *event_name;
886 struct hlist_head *head;
3d084699 887 int ret;
4e3c1b9b 888
f7d06400 889 if (chan->priv->free_event_id == -1U) {
4cf0bf51 890 ret = -EMFILE;
e5382b6d 891 goto full;
abc0446a 892 }
3c997079
MD		 893
894 switch (itype) {
606828e4 895 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 896 event_name = event_desc->event_name;
3c997079 897 break;
b4a75708 898
c190d76e
MJ		 899 case LTTNG_KERNEL_ABI_KPROBE:
900 lttng_fallthrough;
901 case LTTNG_KERNEL_ABI_UPROBE:
902 lttng_fallthrough;
903 case LTTNG_KERNEL_ABI_KRETPROBE:
904 lttng_fallthrough;
606828e4 905 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 906 event_name = event_param->name;
907 break;
b4a75708 908
c190d76e
MJ		 909 case LTTNG_KERNEL_ABI_FUNCTION:
910 lttng_fallthrough;
911 case LTTNG_KERNEL_ABI_NOOP:
912 lttng_fallthrough;
3c997079
MD		 913 default:
914 WARN_ON_ONCE(1);
915 ret = -EINVAL;
916 goto type_error;
917 }
4a11ef1c 918
8cdc1a81 919 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
4a11ef1c 920 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 921 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
922 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
923 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 924 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 925 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 926 ret = -EEXIST;
927 goto exist;
abc0446a
MD		 928 }
929 }
3c997079 930
a67ba386
MD		 931 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
932 if (!event_recorder) {
4cf0bf51 933 ret = -ENOMEM;
4e3c1b9b 934 goto cache_error;
abc0446a 935 }
a67ba386
MD		 936 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
937 if (!event_recorder_priv) {
938 ret = -ENOMEM;
939 goto cache_private_error;
940 }
941 event_recorder_priv->pub = event_recorder;
942 event_recorder_priv->parent.pub = &event_recorder->parent;
943 event_recorder->priv = event_recorder_priv;
944 event_recorder->parent.priv = &event_recorder_priv->parent;
945 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
946
8a445457 947 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 948 event_recorder->chan = chan;
f7d06400 949 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 950 event_recorder->priv->parent.instrumentation = itype;
951 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
952 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 953
954 switch (itype) {
606828e4 955 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 956 /* Event will be enabled by enabler sync. */
a67ba386
MD		 957 event_recorder->parent.enabled = 0;
958 event_recorder->priv->parent.registered = 0;
959 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
960 if (!event_recorder->priv->parent.desc) {
4cf0bf51 961 ret = -ENOENT;
d3dbe23c 962 goto register_error;
abc0446a 963 }
3c997079
MD		 964 /* Populate lttng_event structure before event registration. */
965 smp_wmb();
baf20995 966 break;
b4a75708 967
606828e4 968 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 969 /*
970 * Needs to be explicitly enabled after creation, since
971 * we may want to apply filters.
972 */
a67ba386
MD		 973 event_recorder->parent.enabled = 0;
974 event_recorder->priv->parent.registered = 1;
3c997079
MD		 975 /*
976 * Populate lttng_event structure before event
977 * registration.
978 */
979 smp_wmb();
8bf17deb 980 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 981 event_param->u.kprobe.symbol_name,
982 event_param->u.kprobe.offset,
983 event_param->u.kprobe.addr,
6a35e5bd 984 &event_recorder->parent);
abc0446a 985 if (ret) {
4cf0bf51 986 ret = -EINVAL;
d6d808f3 987 goto register_error;
abc0446a 988 }
a67ba386 989 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 990 WARN_ON_ONCE(!ret);
d6d808f3 991 break;
b4a75708 992
606828e4 993 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 994 {
a67ba386
MD		 995 struct lttng_kernel_event_recorder *event_recorder_return;
996 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 997
998 /* kretprobe defines 2 events */
a0493bef
MD		 999 /*
1000 * Needs to be explicitly enabled after creation, since
1001 * we may want to apply filters.
1002 */
a67ba386
MD		 1003 event_recorder->parent.enabled = 0;
1004 event_recorder->priv->parent.registered = 1;
1005
1006 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
1007 if (!event_recorder_return) {
1008 ret = -ENOMEM;
1009 goto register_error;
1010 }
1011 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1012 if (!event_recorder_return_priv) {
1013 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1014 ret = -ENOMEM;
7371f44c 1015 goto register_error;
abc0446a 1016 }
a67ba386
MD		 1017 event_recorder_return_priv->pub = event_recorder_return;
1018 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1019 event_recorder_return->priv = event_recorder_return_priv;
1020 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1021 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1022
8a445457 1023 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 1024 event_recorder_return->chan = chan;
f7d06400 1025 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 1026 event_recorder_return->priv->parent.instrumentation = itype;
1027 event_recorder_return->parent.enabled = 0;
1028 event_recorder_return->priv->parent.registered = 1;
1029 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1030 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1031 /*
a90917c3 1032 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1033 */
1034 smp_wmb();
3c997079 1035 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1036 event_param->u.kretprobe.symbol_name,
1037 event_param->u.kretprobe.offset,
1038 event_param->u.kretprobe.addr,
eb6b47db 1039 &event_recorder->parent, &event_recorder_return->parent);
7371f44c 1040 if (ret) {
a67ba386
MD		 1041 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1042 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1043 ret = -EINVAL;
7371f44c
MD		 1044 goto register_error;
1045 }
1046 /* Take 2 refs on the module: one per event. */
a67ba386 1047 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1048 WARN_ON_ONCE(!ret);
a67ba386 1049 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1050 WARN_ON_ONCE(!ret);
f7d06400 1051 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1052 event_recorder_return);
abc0446a 1053 WARN_ON_ONCE(ret > 0);
7371f44c 1054 if (ret) {
a67ba386
MD		 1055 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1056 kmem_cache_free(event_recorder_cache, event_recorder_return);
1057 module_put(event_recorder_return->priv->parent.desc->owner);
1058 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1059 goto statedump_error;
1060 }
f7d06400 1061 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
7371f44c
MD		 1062 break;
1063 }
b4a75708 1064
606828e4 1065 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1066 /*
1067 * Needs to be explicitly enabled after creation, since
1068 * we may want to apply filters.
1069 */
a67ba386
MD		 1070 event_recorder->parent.enabled = 0;
1071 event_recorder->priv->parent.registered = 0;
1072 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1073 switch (event_param->u.syscall.entryexit) {
606828e4 1074 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1075 ret = -EINVAL;
1076 goto register_error;
606828e4 1077 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1078 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1079 break;
606828e4 1080 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1081 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1082 break;
1083 }
1084 switch (event_param->u.syscall.abi) {
606828e4 1085 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1086 ret = -EINVAL;
1087 goto register_error;
606828e4 1088 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1089 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1090 break;
606828e4 1091 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1092 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1093 break;
1094 }
a67ba386 1095 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1096 ret = -EINVAL;
259b6cb3 1097 goto register_error;
abc0446a 1098 }
1ec65de1 1099 break;
b4a75708 1100
606828e4 1101 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1102 /*
1103 * Needs to be explicitly enabled after creation, since
1104 * we may want to apply filters.
1105 */
a67ba386
MD		 1106 event_recorder->parent.enabled = 0;
1107 event_recorder->priv->parent.registered = 1;
3aed4dca 1108
a344f64b
FD		 1109 /*
1110 * Populate lttng_event structure before event
1111 * registration.
1112 */
1113 smp_wmb();
149b9a9d 1114
83b802dc 1115 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1116 event_param->u.uprobe.fd,
17806c46 1117 &event_recorder->parent);
149b9a9d
YB		 1118 if (ret)
1119 goto register_error;
a67ba386 1120 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1121 WARN_ON_ONCE(!ret);
1122 break;
b4a75708 1123
c190d76e
MJ		 1124 case LTTNG_KERNEL_ABI_FUNCTION:
1125 lttng_fallthrough;
1126 case LTTNG_KERNEL_ABI_NOOP:
1127 lttng_fallthrough;
baf20995
MD		 1128 default:
1129 WARN_ON_ONCE(1);
4cf0bf51 1130 ret = -EINVAL;
df07930b 1131 goto register_error;
baf20995 1132 }
f7d06400 1133 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1134 WARN_ON_ONCE(ret > 0);
1135 if (ret) {
c099397a 1136 goto statedump_error;
abc0446a 1137 }
a67ba386 1138 hlist_add_head(&event_recorder->priv->hlist, head);
f7d06400 1139 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
a67ba386 1140 return event_recorder;
4e3c1b9b 1141
c099397a 1142statedump_error:
259b6cb3 1143 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1144register_error:
a67ba386
MD		 1145 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1146cache_private_error:
1147 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1148cache_error:
1149exist:
3c997079 1150type_error:
e5382b6d 1151full:
4cf0bf51 1152 return ERR_PTR(ret);
4e3c1b9b
MD		 1153}
1154
a67ba386 1155struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1156 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1157 uint64_t token, uint64_t error_counter_index,
1158 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1159 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1160 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1161{
a67ba386
MD		 1162 struct lttng_kernel_event_notifier *event_notifier;
1163 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1164 struct lttng_counter *error_counter;
dffef45d
FD		 1165 const char *event_name;
1166 struct hlist_head *head;
1167 int ret;
1168
1169 switch (itype) {
606828e4 1170 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1171 event_name = event_desc->event_name;
b01155ba 1172 break;
b4a75708 1173
c190d76e
MJ		 1174 case LTTNG_KERNEL_ABI_KPROBE:
1175 lttng_fallthrough;
1176 case LTTNG_KERNEL_ABI_UPROBE:
1177 lttng_fallthrough;
606828e4 1178 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1179 event_name = event_notifier_param->event.name;
1180 break;
b4a75708 1181
c190d76e
MJ		 1182 case LTTNG_KERNEL_ABI_KRETPROBE:
1183 lttng_fallthrough;
1184 case LTTNG_KERNEL_ABI_FUNCTION:
1185 lttng_fallthrough;
1186 case LTTNG_KERNEL_ABI_NOOP:
1187 lttng_fallthrough;
dffef45d
FD		 1188 default:
1189 WARN_ON_ONCE(1);
1190 ret = -EINVAL;
1191 goto type_error;
1192 }
1193
1194 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1195 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1196 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1197 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1198 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1199 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1200 && event_notifier_group == event_notifier_priv->group
1201 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1202 ret = -EEXIST;
1203 goto exist;
1204 }
1205 }
1206
1207 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1208 if (!event_notifier) {
1209 ret = -ENOMEM;
1210 goto cache_error;
1211 }
a67ba386
MD		 1212 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1213 if (!event_notifier_priv) {
1214 ret = -ENOMEM;
1215 goto cache_private_error;
1216 }
1217 event_notifier_priv->pub = event_notifier;
1218 event_notifier_priv->parent.pub = &event_notifier->parent;
1219 event_notifier->priv = event_notifier_priv;
1220 event_notifier->parent.priv = &event_notifier_priv->parent;
1221 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1222
1223 event_notifier->priv->group = event_notifier_group;
1224 event_notifier->priv->parent.user_token = token;
1225 event_notifier->priv->error_counter_index = error_counter_index;
1226 event_notifier->priv->num_captures = 0;
1227 event_notifier->priv->parent.instrumentation = itype;
1228 event_notifier->notification_send = lttng_event_notifier_notification_send;
1229 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1230 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1231 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1232 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1233
1234 switch (itype) {
606828e4 1235 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1236 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1237 event_notifier->parent.enabled = 0;
1238 event_notifier->priv->parent.registered = 0;
1239 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1240 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1241 ret = -ENOENT;
1242 goto register_error;
1243 }
1244 /* Populate lttng_event_notifier structure before event registration. */
1245 smp_wmb();
1246 break;
b4a75708 1247
606828e4 1248 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1249 /*
1250 * Needs to be explicitly enabled after creation, since
1251 * we may want to apply filters.
1252 */
a67ba386
MD		 1253 event_notifier->parent.enabled = 0;
1254 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1255 /*
1256 * Populate lttng_event_notifier structure before event
1257 * registration.
1258 */
1259 smp_wmb();
6a35e5bd 1260 ret = lttng_kprobes_register_event(event_notifier_param->event.u.kprobe.symbol_name,
2b16f0c9
FD		 1261 event_notifier_param->event.u.kprobe.symbol_name,
1262 event_notifier_param->event.u.kprobe.offset,
1263 event_notifier_param->event.u.kprobe.addr,
6a35e5bd 1264 &event_notifier->parent);
2b16f0c9
FD		 1265 if (ret) {
1266 ret = -EINVAL;
1267 goto register_error;
1268 }
a67ba386 1269 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1270 WARN_ON_ONCE(!ret);
1271 break;
b4a75708 1272
606828e4 1273 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1274 /*
1275 * Needs to be explicitly enabled after creation, since
1276 * we may want to apply filters.
1277 */
a67ba386
MD		 1278 event_notifier->parent.enabled = 0;
1279 event_notifier->priv->parent.registered = 0;
1280 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1281 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1282 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1283 ret = -EINVAL;
1284 goto register_error;
606828e4 1285 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1286 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1287 break;
606828e4 1288 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1289 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1290 break;
1291 }
1292 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1293 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1294 ret = -EINVAL;
1295 goto register_error;
606828e4 1296 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1297 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1298 break;
606828e4 1299 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1300 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1301 break;
1302 }
1303
a67ba386 1304 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1305 ret = -EINVAL;
1306 goto register_error;
1307 }
1308 break;
b4a75708 1309
606828e4 1310 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1311 /*
1312 * Needs to be explicitly enabled after creation, since
1313 * we may want to apply filters.
1314 */
a67ba386
MD		 1315 event_notifier->parent.enabled = 0;
1316 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1317
1318 /*
1319 * Populate lttng_event_notifier structure before
1320 * event_notifier registration.
1321 */
1322 smp_wmb();
1323
17806c46 1324 ret = lttng_uprobes_register_event(event_notifier_param->event.name,
9de67196 1325 event_notifier_param->event.u.uprobe.fd,
17806c46 1326 &event_notifier->parent);
9de67196
FD		 1327 if (ret)
1328 goto register_error;
a67ba386 1329 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1330 WARN_ON_ONCE(!ret);
1331 break;
b4a75708 1332
c190d76e
MJ		 1333 case LTTNG_KERNEL_ABI_KRETPROBE:
1334 lttng_fallthrough;
1335 case LTTNG_KERNEL_ABI_FUNCTION:
1336 lttng_fallthrough;
1337 case LTTNG_KERNEL_ABI_NOOP:
1338 lttng_fallthrough;
dffef45d
FD		 1339 default:
1340 WARN_ON_ONCE(1);
1341 ret = -EINVAL;
1342 goto register_error;
1343 }
1344
a67ba386
MD		 1345 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1346 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1347
1348 /*
1349 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1350 * bucket is currently in use. We trust it. The session lock
1351 * synchronizes against concurrent creation of the error
1352 * counter.
99f52fcc 1353 */
ab04d7b1
MD		 1354 error_counter = event_notifier_group->error_counter;
1355 if (error_counter) {
99f52fcc
FD		 1356 size_t dimension_index[1];
1357
1358 /*
1359 * Check that the index is within the boundary of the counter.
1360 */
a67ba386 1361 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1362 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1363 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1364 ret = -EINVAL;
1365 goto register_error;
1366 }
1367
a67ba386 1368 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1369 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1370 if (ret) {
1371 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1372 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1373 goto register_error;
1374 }
1375 }
1376
dffef45d
FD		 1377 return event_notifier;
1378
1379register_error:
a67ba386
MD		 1380 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1381cache_private_error:
dffef45d
FD		 1382 kmem_cache_free(event_notifier_cache, event_notifier);
1383cache_error:
1384exist:
1385type_error:
1386 return ERR_PTR(ret);
1387}
1388
99f52fcc
FD		 1389int lttng_kernel_counter_read(struct lttng_counter *counter,
1390 const size_t *dim_indexes, int32_t cpu,
1391 int64_t *val, bool *overflow, bool *underflow)
1392{
1393 return counter->ops->counter_read(counter->counter, dim_indexes,
1394 cpu, val, overflow, underflow);
1395}
1396
1397int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1398 const size_t *dim_indexes, int64_t *val,
1399 bool *overflow, bool *underflow)
1400{
1401 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1402 val, overflow, underflow);
1403}
1404
1405int lttng_kernel_counter_clear(struct lttng_counter *counter,
1406 const size_t *dim_indexes)
1407{
1408 return counter->ops->counter_clear(counter->counter, dim_indexes);
1409}
1410
1ae083ba 1411struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler,
def1e304 1412 const struct lttng_kernel_event_desc *event_desc)
3c997079 1413{
a67ba386 1414 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1415
1416 mutex_lock(&sessions_mutex);
def1e304 1417 event = _lttng_kernel_event_recorder_create(event_enabler, event_desc);
3c997079
MD		 1418 mutex_unlock(&sessions_mutex);
1419 return event;
1420}
1421
a67ba386 1422struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1423 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1424 uint64_t id, uint64_t error_counter_index,
1425 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1426 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1427 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1428{
a67ba386 1429 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1430
1431 mutex_lock(&sessions_mutex);
1432 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1433 error_counter_index, event_notifier_group,
a67ba386 1434 event_notifier_param, itype);
dffef45d
FD		 1435 mutex_unlock(&sessions_mutex);
1436 return event_notifier;
1437}
1438
3c997079
MD		 1439/* Only used for tracepoints for now. */
1440static
96c59af1 1441void register_event_recorder(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1442{
437d5aa5 1443 const struct lttng_kernel_event_desc *desc;
f127e61e 1444 int ret = -EINVAL;
3c997079 1445
a67ba386 1446 if (event_recorder->priv->parent.registered)
3c997079 1447 return;
4ecb5ad5 1448
a67ba386
MD		 1449 desc = event_recorder->priv->parent.desc;
1450 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1451 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1452 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1453 desc->tp_class->probe_callback,
14a15bad 1454 &event_recorder->parent);
4ecb5ad5 1455 break;
b4a75708 1456
606828e4 1457 case LTTNG_KERNEL_ABI_SYSCALL:
9b2f1c54 1458 ret = lttng_syscall_filter_enable_event(&event_recorder->parent);
4ecb5ad5 1459 break;
b4a75708 1460
c190d76e
MJ		 1461 case LTTNG_KERNEL_ABI_KPROBE:
1462 lttng_fallthrough;
1463 case LTTNG_KERNEL_ABI_UPROBE:
1464 lttng_fallthrough;
606828e4 1465 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1466 ret = 0;
1467 break;
b4a75708 1468
c190d76e
MJ		 1469 case LTTNG_KERNEL_ABI_FUNCTION:
1470 lttng_fallthrough;
1471 case LTTNG_KERNEL_ABI_NOOP:
1472 lttng_fallthrough;
4ecb5ad5
MD		 1473 default:
1474 WARN_ON_ONCE(1);
1475 }
3c997079 1476 if (!ret)
a67ba386 1477 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1478}
1479
4e3c1b9b
MD		 1480/*
1481 * Only used internally at session destruction.
1482 */
96c59af1 1483int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1484{
a67ba386 1485 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1486 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1487 int ret = -EINVAL;
1488
a67ba386 1489 if (!event_priv->registered)
3c997079
MD		 1490 return 0;
1491
a67ba386
MD		 1492 desc = event_priv->desc;
1493 switch (event_priv->instrumentation) {
606828e4 1494 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1495 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
6c8c025b 1496 event_priv->desc->tp_class->probe_callback,
14a15bad 1497 &event_recorder->parent);
baf20995 1498 break;
b4a75708 1499
606828e4 1500 case LTTNG_KERNEL_ABI_KPROBE:
6a35e5bd 1501 lttng_kprobes_unregister_event(&event_recorder->parent);
d6d808f3
MD		 1502 ret = 0;
1503 break;
b4a75708 1504
606828e4 1505 case LTTNG_KERNEL_ABI_KRETPROBE:
eb6b47db 1506 lttng_kretprobes_unregister(&event_recorder->parent);
7371f44c
MD		 1507 ret = 0;
1508 break;
b4a75708 1509
606828e4 1510 case LTTNG_KERNEL_ABI_SYSCALL:
9b2f1c54 1511 ret = lttng_syscall_filter_disable_event(&event_recorder->parent);
4ecb5ad5 1512 break;
b4a75708 1513
606828e4 1514 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1515 ret = 0;
1516 break;
b4a75708 1517
606828e4 1518 case LTTNG_KERNEL_ABI_UPROBE:
17806c46 1519 lttng_uprobes_unregister_event(&event_recorder->parent);
149b9a9d
YB		 1520 ret = 0;
1521 break;
b4a75708 1522
c190d76e
MJ		 1523 case LTTNG_KERNEL_ABI_FUNCTION:
1524 lttng_fallthrough;
baf20995
MD		 1525 default:
1526 WARN_ON_ONCE(1);
1527 }
3c997079 1528 if (!ret)
a67ba386 1529 event_priv->registered = 0;
dda6a249
MD		 1530 return ret;
1531}
1532
dffef45d
FD		 1533/* Only used for tracepoints for now. */
1534static
a67ba386 1535void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1536{
437d5aa5 1537 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1538 int ret = -EINVAL;
1539
a67ba386 1540 if (event_notifier->priv->parent.registered)
dffef45d
FD		 1541 return;
1542
a67ba386
MD		 1543 desc = event_notifier->priv->parent.desc;
1544 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1545 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1546 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
6c8c025b 1547 desc->tp_class->probe_callback,
14a15bad 1548 &event_notifier->parent);
b01155ba 1549 break;
b4a75708 1550
606828e4 1551 case LTTNG_KERNEL_ABI_SYSCALL:
9b2f1c54 1552 ret = lttng_syscall_filter_enable_event(&event_notifier->parent);
8a8ac9a8 1553 break;
b4a75708 1554
c190d76e
MJ		 1555 case LTTNG_KERNEL_ABI_KPROBE:
1556 lttng_fallthrough;
606828e4 1557 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1558 ret = 0;
1559 break;
b4a75708 1560
c190d76e
MJ		 1561 case LTTNG_KERNEL_ABI_KRETPROBE:
1562 lttng_fallthrough;
1563 case LTTNG_KERNEL_ABI_FUNCTION:
1564 lttng_fallthrough;
1565 case LTTNG_KERNEL_ABI_NOOP:
1566 lttng_fallthrough;
dffef45d
FD		 1567 default:
1568 WARN_ON_ONCE(1);
1569 }
1570 if (!ret)
a67ba386 1571 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1572}
1573
1574static
1575int _lttng_event_notifier_unregister(
a67ba386 1576 struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1577{
437d5aa5 1578 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1579 int ret = -EINVAL;
1580
a67ba386 1581 if (!event_notifier->priv->parent.registered)
dffef45d
FD		 1582 return 0;
1583
a67ba386
MD		 1584 desc = event_notifier->priv->parent.desc;
1585 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1586 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1587 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
6c8c025b 1588 event_notifier->priv->parent.desc->tp_class->probe_callback,
14a15bad 1589 &event_notifier->parent);
b01155ba 1590 break;
b4a75708 1591
606828e4 1592 case LTTNG_KERNEL_ABI_KPROBE:
6a35e5bd 1593 lttng_kprobes_unregister_event(&event_notifier->parent);
2b16f0c9
FD		 1594 ret = 0;
1595 break;
b4a75708 1596
606828e4 1597 case LTTNG_KERNEL_ABI_UPROBE:
17806c46 1598 lttng_uprobes_unregister_event(&event_notifier->parent);
9de67196
FD		 1599 ret = 0;
1600 break;
b4a75708 1601
606828e4 1602 case LTTNG_KERNEL_ABI_SYSCALL:
9b2f1c54 1603 ret = lttng_syscall_filter_disable_event(&event_notifier->parent);
8a8ac9a8 1604 break;
b4a75708 1605
c190d76e
MJ		 1606 case LTTNG_KERNEL_ABI_KRETPROBE:
1607 lttng_fallthrough;
1608 case LTTNG_KERNEL_ABI_FUNCTION:
1609 lttng_fallthrough;
1610 case LTTNG_KERNEL_ABI_NOOP:
1611 lttng_fallthrough;
dffef45d
FD		 1612 default:
1613 WARN_ON_ONCE(1);
1614 }
1615 if (!ret)
a67ba386 1616 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1617 return ret;
1618}
1619
dda6a249
MD		 1620/*
1621 * Only used internally at session destruction.
1622 */
be066e6c 1623static
0648898e 1624void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1625{
0648898e 1626 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1627 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1628
0648898e
MD		 1629 lttng_free_event_filter_runtime(event);
1630 /* Free event enabler refs */
1631 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1632 &event_priv->enablers_ref_head, node)
1633 kfree(enabler_ref);
b4a75708 1634
0648898e
MD		 1635 switch (event->type) {
1636 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1637 {
1638 struct lttng_kernel_event_recorder *event_recorder =
1639 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1640
0648898e
MD		 1641 switch (event_priv->instrumentation) {
1642 case LTTNG_KERNEL_ABI_TRACEPOINT:
1643 lttng_event_desc_put(event_priv->desc);
1644 break;
b4a75708 1645
0648898e
MD		 1646 case LTTNG_KERNEL_ABI_KPROBE:
1647 module_put(event_priv->desc->owner);
6a35e5bd 1648 lttng_kprobes_destroy_event_private(&event_recorder->parent);
0648898e 1649 break;
b4a75708 1650
0648898e
MD		 1651 case LTTNG_KERNEL_ABI_KRETPROBE:
1652 module_put(event_priv->desc->owner);
eb6b47db 1653 lttng_kretprobes_destroy_private(&event_recorder->parent);
0648898e 1654 break;
b4a75708 1655
0648898e
MD		 1656 case LTTNG_KERNEL_ABI_SYSCALL:
1657 break;
4e3c1b9b 1658
0648898e
MD		 1659 case LTTNG_KERNEL_ABI_UPROBE:
1660 module_put(event_priv->desc->owner);
17806c46 1661 lttng_uprobes_destroy_event_private(&event_recorder->parent);
0648898e 1662 break;
3ef5cc03 1663
c190d76e
MJ		 1664 case LTTNG_KERNEL_ABI_FUNCTION:
1665 lttng_fallthrough;
1666 case LTTNG_KERNEL_ABI_NOOP:
1667 lttng_fallthrough;
0648898e
MD		 1668 default:
1669 WARN_ON_ONCE(1);
1670 }
1671 list_del(&event_recorder->priv->node);
1672 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1673 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1674 break;
0648898e
MD		 1675 }
1676 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1677 {
1678 struct lttng_kernel_event_notifier *event_notifier =
1679 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1680
0648898e
MD		 1681 switch (event_notifier->priv->parent.instrumentation) {
1682 case LTTNG_KERNEL_ABI_TRACEPOINT:
1683 lttng_event_desc_put(event_notifier->priv->parent.desc);
1684 break;
b4a75708 1685
0648898e
MD		 1686 case LTTNG_KERNEL_ABI_KPROBE:
1687 module_put(event_notifier->priv->parent.desc->owner);
6a35e5bd 1688 lttng_kprobes_destroy_event_private(&event_notifier->parent);
0648898e 1689 break;
b4a75708 1690
0648898e
MD		 1691 case LTTNG_KERNEL_ABI_SYSCALL:
1692 break;
b4a75708 1693
0648898e
MD		 1694 case LTTNG_KERNEL_ABI_UPROBE:
1695 module_put(event_notifier->priv->parent.desc->owner);
17806c46 1696 lttng_uprobes_destroy_event_private(&event_notifier->parent);
0648898e
MD		 1697 break;
1698
c190d76e
MJ		 1699 case LTTNG_KERNEL_ABI_KRETPROBE:
1700 lttng_fallthrough;
1701 case LTTNG_KERNEL_ABI_FUNCTION:
1702 lttng_fallthrough;
1703 case LTTNG_KERNEL_ABI_NOOP:
1704 lttng_fallthrough;
0648898e
MD		 1705 default:
1706 WARN_ON_ONCE(1);
1707 }
1708 list_del(&event_notifier->priv->node);
1709 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1710 kmem_cache_free(event_notifier_cache, event_notifier);
1711 break;
1712 }
dffef45d
FD		 1713 default:
1714 WARN_ON_ONCE(1);
1715 }
dffef45d
FD		 1716}
1717
8c0393c3 1718struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1719 enum tracker_type tracker_type)
e0130fab 1720{
d1f652f8
MD		 1721 switch (tracker_type) {
1722 case TRACKER_PID:
1723 return &session->pid_tracker;
1724 case TRACKER_VPID:
1725 return &session->vpid_tracker;
1726 case TRACKER_UID:
1727 return &session->uid_tracker;
1728 case TRACKER_VUID:
1729 return &session->vuid_tracker;
1730 case TRACKER_GID:
1731 return &session->gid_tracker;
1732 case TRACKER_VGID:
1733 return &session->vgid_tracker;
1734 default:
1735 WARN_ON_ONCE(1);
1736 return NULL;
1737 }
1738}
1739
8cdc1a81 1740int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1741 enum tracker_type tracker_type, int id)
1742{
8c0393c3 1743 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1744 int ret;
1745
d1f652f8
MD		 1746 tracker = get_tracker(session, tracker_type);
1747 if (!tracker)
1748 return -EINVAL;
1749 if (id < -1)
e0130fab
MD		 1750 return -EINVAL;
1751 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1752 if (id == -1) {
1753 /* track all ids: destroy tracker. */
1754 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1755 ret = 0;
1756 } else {
d1f652f8 1757 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1758 }
e0130fab
MD		 1759 mutex_unlock(&sessions_mutex);
1760 return ret;
1761}
1762
8cdc1a81 1763int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1764 enum tracker_type tracker_type, int id)
e0130fab 1765{
8c0393c3 1766 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1767 int ret;
1768
d1f652f8
MD		 1769 tracker = get_tracker(session, tracker_type);
1770 if (!tracker)
1771 return -EINVAL;
1772 if (id < -1)
e0130fab
MD		 1773 return -EINVAL;
1774 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1775 if (id == -1) {
1776 /* untrack all ids: replace by empty tracker. */
1777 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1778 } else {
d1f652f8 1779 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1780 }
e0130fab
MD		 1781 mutex_unlock(&sessions_mutex);
1782 return ret;
1783}
1784
7e6f9ef6 1785static
d1f652f8 1786void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1787{
8c0393c3
MD		 1788 struct lttng_kernel_id_tracker *id_tracker = m->private;
1789 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1790 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1791 int iter = 0, i;
1792
1793 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1794 if (id_tracker_p) {
1795 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1796 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1797
f934e302 1798 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1799 if (iter++ >= *pos)
1800 return e;
1801 }
1802 }
1803 } else {
d1f652f8 1804 /* ID tracker disabled. */
7e6f9ef6 1805 if (iter >= *pos && iter == 0) {
d1f652f8 1806 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1807 }
1808 iter++;
1809 }
1810 /* End of list */
1811 return NULL;
1812}
1813
1814/* Called with sessions_mutex held. */
1815static
d1f652f8 1816void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1817{
8c0393c3
MD		 1818 struct lttng_kernel_id_tracker *id_tracker = m->private;
1819 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1820 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1821 int iter = 0, i;
1822
1823 (*ppos)++;
d1f652f8
MD		 1824 if (id_tracker_p) {
1825 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1826 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1827
f934e302 1828 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1829 if (iter++ >= *ppos)
1830 return e;
1831 }
1832 }
1833 } else {
d1f652f8 1834 /* ID tracker disabled. */
7e6f9ef6 1835 if (iter >= *ppos && iter == 0)
d1f652f8 1836 return p; /* empty tracker */
7e6f9ef6
MD		 1837 iter++;
1838 }
1839
1840 /* End of list */
1841 return NULL;
1842}
1843
1844static
d1f652f8 1845void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1846{
1847 mutex_unlock(&sessions_mutex);
1848}
1849
1850static
d1f652f8 1851int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1852{
8c0393c3
MD		 1853 struct lttng_kernel_id_tracker *id_tracker = m->private;
1854 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1855 int id;
7e6f9ef6 1856
d1f652f8 1857 if (p == id_tracker_p) {
7e6f9ef6 1858 /* Tracker disabled. */
d1f652f8 1859 id = -1;
7e6f9ef6 1860 } else {
d1f652f8 1861 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1862
d1f652f8
MD		 1863 id = lttng_id_tracker_get_node_id(e);
1864 }
8c0393c3 1865 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1866 case TRACKER_PID:
1867 seq_printf(m, "process { pid = %d; };\n", id);
1868 break;
1869 case TRACKER_VPID:
1870 seq_printf(m, "process { vpid = %d; };\n", id);
1871 break;
1872 case TRACKER_UID:
1873 seq_printf(m, "user { uid = %d; };\n", id);
1874 break;
1875 case TRACKER_VUID:
1876 seq_printf(m, "user { vuid = %d; };\n", id);
1877 break;
1878 case TRACKER_GID:
1879 seq_printf(m, "group { gid = %d; };\n", id);
1880 break;
1881 case TRACKER_VGID:
1882 seq_printf(m, "group { vgid = %d; };\n", id);
1883 break;
1884 default:
1885 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1886 }
7e6f9ef6
MD		 1887 return 0;
1888}
1889
1890static
d1f652f8
MD		 1891const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1892 .start = id_list_start,
1893 .next = id_list_next,
1894 .stop = id_list_stop,
1895 .show = id_list_show,
7e6f9ef6
MD		 1896};
1897
1898static
d1f652f8 1899int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1900{
d1f652f8 1901 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1902}
1903
1904static
d1f652f8 1905int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1906{
1907 struct seq_file *m = file->private_data;
8c0393c3 1908 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1909 int ret;
1910
d1f652f8 1911 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1912 ret = seq_release(inode, file);
d1f652f8 1913 if (!ret)
8c0393c3 1914 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1915 return ret;
1916}
1917
d1f652f8 1918const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1919 .owner = THIS_MODULE,
d1f652f8 1920 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1921 .read = seq_read,
1922 .llseek = seq_lseek,
d1f652f8 1923 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1924};
1925
8cdc1a81 1926int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1927 enum tracker_type tracker_type)
7e6f9ef6 1928{
d1f652f8 1929 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1930 struct seq_file *m;
1931 int file_fd, ret;
1932
1933 file_fd = lttng_get_unused_fd();
1934 if (file_fd < 0) {
1935 ret = file_fd;
1936 goto fd_error;
1937 }
1938
d1f652f8
MD		 1939 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1940 &lttng_tracker_ids_list_fops,
7e6f9ef6 1941 NULL, O_RDWR);
d1f652f8
MD		 1942 if (IS_ERR(tracker_ids_list_file)) {
1943 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1944 goto file_error;
1945 }
8cdc1a81 1946 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1947 ret = -EOVERFLOW;
9c1f4643
MD		 1948 goto refcount_error;
1949 }
d1f652f8 1950 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1951 if (ret < 0)
1952 goto open_error;
d1f652f8
MD		 1953 m = tracker_ids_list_file->private_data;
1954
1955 m->private = get_tracker(session, tracker_type);
1956 BUG_ON(!m->private);
1957 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1958
1959 return file_fd;
1960
1961open_error:
8cdc1a81 1962 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1963refcount_error:
d1f652f8 1964 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1965file_error:
1966 put_unused_fd(file_fd);
1967fd_error:
1968 return ret;
1969}
1970
3c997079
MD		 1971/*
1972 * Enabler management.
1973 */
1974static
4993071a
PP		 1975int lttng_match_enabler_star_glob(const char *desc_name,
1976 const char *pattern)
3c997079 1977{
cbc19040
MD		 1978 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1979 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1980 return 0;
1981 return 1;
1982}
1983
1984static
4ecb5ad5
MD		 1985int lttng_match_enabler_name(const char *desc_name,
1986 const char *name)
3c997079 1987{
4ecb5ad5 1988 if (strcmp(desc_name, name))
3c997079
MD		 1989 return 0;
1990 return 1;
1991}
1992
437d5aa5 1993int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
8d554755 1994 struct lttng_event_enabler_common *enabler)
3c997079 1995{
4ecb5ad5 1996 const char *desc_name, *enabler_name;
badfe9f5 1997 bool compat = false, entry = false;
4ecb5ad5
MD		 1998
1999 enabler_name = enabler->event_param.name;
2000 switch (enabler->event_param.instrumentation) {
606828e4 2001 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 2002 desc_name = desc->event_name;
3b861b22
FD		 2003 switch (enabler->format_type) {
2004 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2005 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2006 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2007 return lttng_match_enabler_name(desc_name, enabler_name);
2008 default:
2009 return -EINVAL;
2010 }
4ecb5ad5 2011 break;
b4a75708 2012
606828e4 2013 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 2014 desc_name = desc->event_name;
badfe9f5 2015 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 2016 desc_name += strlen("compat_");
badfe9f5
MD		 2017 compat = true;
2018 }
4ecb5ad5
MD		 2019 if (!strncmp(desc_name, "syscall_exit_",
2020 strlen("syscall_exit_"))) {
2021 desc_name += strlen("syscall_exit_");
2022 } else if (!strncmp(desc_name, "syscall_entry_",
2023 strlen("syscall_entry_"))) {
2024 desc_name += strlen("syscall_entry_");
badfe9f5 2025 entry = true;
4ecb5ad5
MD		 2026 } else {
2027 WARN_ON_ONCE(1);
2028 return -EINVAL;
2029 }
badfe9f5 2030 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 2031 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 2032 break;
606828e4 2033 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 2034 if (!entry)
2035 return 0;
2036 break;
606828e4 2037 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 2038 if (entry)
2039 return 0;
2040 break;
2041 default:
2042 return -EINVAL;
2043 }
2044 switch (enabler->event_param.u.syscall.abi) {
606828e4 2045 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2046 break;
606828e4 2047 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2048 if (compat)
2049 return 0;
2050 break;
606828e4 2051 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2052 if (!compat)
2053 return 0;
2054 break;
2055 default:
2056 return -EINVAL;
2057 }
2058 switch (enabler->event_param.u.syscall.match) {
606828e4 2059 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2060 switch (enabler->format_type) {
2061 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2062 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2063 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2064 return lttng_match_enabler_name(desc_name, enabler_name);
2065 default:
2066 return -EINVAL;
2067 }
2068 break;
606828e4 2069 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2070 return -EINVAL; /* Not implemented. */
2071 default:
2072 return -EINVAL;
2073 }
4ecb5ad5 2074 break;
b4a75708 2075
4ecb5ad5
MD		 2076 default:
2077 WARN_ON_ONCE(1);
2078 return -EINVAL;
2079 }
3c997079
MD		 2080}
2081
2082static
1ae083ba 2083int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler *event_enabler,
a67ba386 2084 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2085{
1ae083ba 2086 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(
b2bc0bc8
FD		 2087 event_enabler);
2088
a67ba386 2089 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2090 return 0;
a67ba386
MD		 2091 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2092 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2093 return 1;
2094 else
2095 return 0;
2096}
2097
b01155ba
FD		 2098static
2099int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2100 struct lttng_kernel_event_notifier *event_notifier)
b01155ba 2101{
8d554755 2102 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(
b01155ba
FD		 2103 event_notifier_enabler);
2104
a67ba386 2105 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2106 return 0;
a67ba386
MD		 2107 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2108 && event_notifier->priv->group == event_notifier_enabler->group
5b9817ae 2109 && event_notifier->priv->parent.user_token == event_notifier_enabler->parent.user_token)
b01155ba
FD		 2110 return 1;
2111 else
2112 return 0;
2113}
2114
3c997079 2115static
b2bc0bc8
FD		 2116struct lttng_enabler_ref *lttng_enabler_ref(
2117 struct list_head *enablers_ref_list,
8d554755 2118 struct lttng_event_enabler_common *enabler)
3c997079
MD		 2119{
2120 struct lttng_enabler_ref *enabler_ref;
2121
b2bc0bc8 2122 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2123 if (enabler_ref->ref == enabler)
2124 return enabler_ref;
2125 }
2126 return NULL;
2127}
2128
3c997079 2129static
1ae083ba 2130void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2131{
f7d06400 2132 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
437d5aa5
MD		 2133 struct lttng_kernel_probe_desc *probe_desc;
2134 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2135 int i;
2136 struct list_head *probe_list;
2137
2138 probe_list = lttng_get_probe_list_head();
2139 /*
2140 * For each probe event, if we find that a probe event matches
2141 * our enabler, create an associated lttng_event if not
2142 * already present.
2143 */
2144 list_for_each_entry(probe_desc, probe_list, head) {
2145 for (i = 0; i < probe_desc->nr_events; i++) {
2146 int found = 0;
2147 struct hlist_head *head;
a67ba386
MD		 2148 struct lttng_kernel_event_recorder_private *event_recorder_private;
2149 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2150
2151 desc = probe_desc->event_desc[i];
b2bc0bc8 2152 if (!lttng_desc_match_enabler(desc,
1ae083ba 2153 lttng_event_recorder_enabler_as_enabler(event_enabler)))
3c997079 2154 continue;
3c997079
MD		 2155
2156 /*
2157 * Check if already created.
2158 */
4a11ef1c 2159 head = utils_borrow_hash_table_bucket(
8cdc1a81 2160 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2161 desc->event_name);
a67ba386
MD		 2162 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2163 if (event_recorder_private->parent.desc == desc
2164 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2165 found = 1;
2166 }
2167 if (found)
2168 continue;
2169
2170 /*
2171 * We need to create an event for this
2172 * event probe.
2173 */
def1e304 2174 event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
a67ba386 2175 if (!event_recorder) {
5a15f70c 2176 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2177 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2178 }
2179 }
2180 }
2181}
2182
b01155ba
FD		 2183static
2184void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2185{
2186 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2187 struct lttng_kernel_probe_desc *probe_desc;
2188 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2189 int i;
2190 struct list_head *probe_list;
2191
2192 probe_list = lttng_get_probe_list_head();
2193 /*
2194 * For each probe event, if we find that a probe event matches
2195 * our enabler, create an associated lttng_event_notifier if not
2196 * already present.
2197 */
2198 list_for_each_entry(probe_desc, probe_list, head) {
2199 for (i = 0; i < probe_desc->nr_events; i++) {
2200 int found = 0;
2201 struct hlist_head *head;
a67ba386
MD		 2202 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2203 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2204
2205 desc = probe_desc->event_desc[i];
2206 if (!lttng_desc_match_enabler(desc,
2207 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2208 continue;
2209
2210 /*
2211 * Check if already created.
2212 */
2213 head = utils_borrow_hash_table_bucket(
2214 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2215 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2216 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2217 if (event_notifier_priv->parent.desc == desc
5b9817ae 2218 && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token)
b01155ba
FD		 2219 found = 1;
2220 }
2221 if (found)
2222 continue;
2223
2224 /*
2225 * We need to create a event_notifier for this event probe.
2226 */
2227 event_notifier = _lttng_event_notifier_create(desc,
5b9817ae 2228 event_notifier_enabler->parent.user_token,
99f52fcc 2229 event_notifier_enabler->error_counter_index,
a67ba386 2230 event_notifier_group, NULL,
606828e4 2231 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2232 if (IS_ERR(event_notifier)) {
2233 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2234 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2235 }
2236 }
2237 }
2238}
2239
33a39a3c 2240static
053554ae 2241void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler)
33a39a3c
MD		 2242{
2243 int ret;
2244
053554ae 2245 ret = lttng_syscalls_register_event(event_enabler);
8a8ac9a8 2246 WARN_ON_ONCE(ret);
8a8ac9a8
FD		 2247}
2248
33a39a3c 2249/*
a67ba386 2250 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2251 * tracepoint probes.
2252 * Should be called with sessions mutex held.
2253 */
2254static
1ae083ba 2255void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler)
33a39a3c 2256{
5b9817ae 2257 switch (event_enabler->parent.event_param.instrumentation) {
606828e4 2258 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2259 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2260 break;
b4a75708 2261
606828e4 2262 case LTTNG_KERNEL_ABI_SYSCALL:
053554ae 2263 lttng_create_syscall_event_if_missing(&event_enabler->parent);
33a39a3c 2264 break;
b4a75708 2265
33a39a3c
MD		 2266 default:
2267 WARN_ON_ONCE(1);
2268 break;
2269 }
2270}
2271
3c997079 2272/*
b2bc0bc8 2273 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2274 * and add backward reference from the event to the enabler.
2275 * Should be called with sessions mutex held.
2276 */
2277static
1ae083ba 2278int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler)
3c997079 2279{
f7d06400
MD		 2280 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2281 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
1ae083ba 2282 struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler);
a67ba386 2283 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2284
606828e4
MD		 2285 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2286 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2287 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2288 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2289 int enabled = base_enabler->enabled;
606828e4 2290 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2291
606828e4 2292 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2293 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled);
3b82c4e1 2294
606828e4 2295 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2296 WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled);
badfe9f5
MD		 2297 }
2298
3c997079 2299 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2300 lttng_create_event_if_missing(event_enabler);
3c997079 2301
b2bc0bc8 2302 /* For each event matching event_enabler in session event list. */
8cdc1a81 2303 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2304 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2305 struct lttng_enabler_ref *enabler_ref;
2306
a67ba386 2307 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2308 continue;
a67ba386 2309 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
1ae083ba 2310 lttng_event_recorder_enabler_as_enabler(event_enabler));
3c997079
MD		 2311 if (!enabler_ref) {
2312 /*
2313 * If no backward ref, create it.
b2bc0bc8 2314 * Add backward ref from event to event_enabler.
3c997079
MD		 2315 */
2316 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2317 if (!enabler_ref)
2318 return -ENOMEM;
1ae083ba 2319 enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler);
3c997079 2320 list_add(&enabler_ref->node,
a67ba386 2321 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2322 }
2323
f127e61e
MD		 2324 /*
2325 * Link filter bytecodes if not linked yet.
2326 */
a67ba386 2327 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2328 lttng_static_ctx,
a67ba386 2329 &event_recorder_priv->parent.filter_bytecode_runtime_head,
1ae083ba 2330 &lttng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2331 }
2332 return 0;
2333}
2334
b01155ba 2335/*
a67ba386 2336 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2337 * tracepoint probes.
2338 * Should be called with sessions mutex held.
2339 */
2340static
2341void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2342{
5b9817ae 2343 switch (event_notifier_enabler->parent.event_param.instrumentation) {
606828e4 2344 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2345 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2346 break;
b4a75708 2347
606828e4 2348 case LTTNG_KERNEL_ABI_SYSCALL:
053554ae 2349 lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent);
8a8ac9a8 2350 break;
b4a75708 2351
b01155ba
FD		 2352 default:
2353 WARN_ON_ONCE(1);
2354 break;
2355 }
2356}
2357
2358/*
2359 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2360 */
2361static
8a8ac9a8
FD		 2362int lttng_event_notifier_enabler_ref_event_notifiers(
2363 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2364{
2365 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8d554755 2366 struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2367 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2368
606828e4
MD		 2369 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2370 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2371 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2372 !strcmp(base_enabler->event_param.name, "*")) {
2373
2374 int enabled = base_enabler->enabled;
606828e4 2375 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2376
606828e4 2377 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2378 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled);
8a8ac9a8 2379
606828e4 2380 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
0bb716a8 2381 WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled);
8a8ac9a8
FD		 2382
2383 }
2384
b01155ba
FD		 2385 /* First ensure that probe event_notifiers are created for this enabler. */
2386 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2387
2388 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2389 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2390 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2391 struct lttng_enabler_ref *enabler_ref;
2392
2393 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2394 continue;
2395
a67ba386 2396 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2397 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2398 if (!enabler_ref) {
2399 /*
2400 * If no backward ref, create it.
2401 * Add backward ref from event_notifier to enabler.
2402 */
2403 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2404 if (!enabler_ref)
2405 return -ENOMEM;
2406
2407 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2408 event_notifier_enabler);
2409 list_add(&enabler_ref->node,
a67ba386 2410 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2411 }
2412
2413 /*
2414 * Link filter bytecodes if not linked yet.
2415 */
a67ba386
MD		 2416 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2417 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2418 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2419
2420 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2421 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2422 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2423 &event_notifier_enabler->capture_bytecode_head);
2424
a67ba386 2425 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2426 }
2427 return 0;
2428}
2429
3c997079
MD		 2430/*
2431 * Called at module load: connect the probe on all enablers matching
2432 * this event.
2433 * Called with sessions lock held.
2434 */
2435int lttng_fix_pending_events(void)
2436{
8cdc1a81 2437 struct lttng_kernel_session_private *session_priv;
3c997079 2438
8cdc1a81
MD		 2439 list_for_each_entry(session_priv, &sessions, list)
2440 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2441 return 0;
2442}
2443
b01155ba
FD		 2444static bool lttng_event_notifier_group_has_active_event_notifiers(
2445 struct lttng_event_notifier_group *event_notifier_group)
2446{
2447 struct lttng_event_notifier_enabler *event_notifier_enabler;
2448
2449 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2450 node) {
5b9817ae 2451 if (event_notifier_enabler->parent.enabled)
b01155ba
FD		 2452 return true;
2453 }
2454 return false;
2455}
2456
2457bool lttng_event_notifier_active(void)
2458{
2459 struct lttng_event_notifier_group *event_notifier_group;
2460
2461 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2462 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2463 return true;
2464 }
2465 return false;
2466}
2467
2468int lttng_fix_pending_event_notifiers(void)
2469{
2470 struct lttng_event_notifier_group *event_notifier_group;
2471
2472 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2473 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2474 return 0;
2475}
2476
1ae083ba 2477struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create(
b2bc0bc8 2478 enum lttng_enabler_format_type format_type,
606828e4 2479 struct lttng_kernel_abi_event *event_param,
f7d06400 2480 struct lttng_kernel_channel_buffer *chan)
3c997079 2481{
1ae083ba 2482 struct lttng_event_recorder_enabler *event_enabler;
3c997079 2483
b2bc0bc8
FD		 2484 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2485 if (!event_enabler)
3c997079 2486 return NULL;
0bb716a8 2487 event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER;
5b9817ae
MD		 2488 event_enabler->parent.format_type = format_type;
2489 INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head);
2490 memcpy(&event_enabler->parent.event_param, event_param,
2491 sizeof(event_enabler->parent.event_param));
b2bc0bc8 2492 event_enabler->chan = chan;
3c997079 2493 /* ctx left NULL */
5b9817ae 2494 event_enabler->parent.enabled = 0;
def1e304
MD		 2495 return event_enabler;
2496}
2497
2498void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
1ae083ba 2499 struct lttng_event_recorder_enabler *event_enabler)
def1e304 2500{
3c997079 2501 mutex_lock(&sessions_mutex);
def1e304
MD		 2502 list_add(&event_enabler->node, &session->priv->enablers_head);
2503 event_enabler->published = true;
2504 lttng_session_lazy_sync_event_enablers(session);
3c997079 2505 mutex_unlock(&sessions_mutex);
3c997079
MD		 2506}
2507
7b25ab0e 2508int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2509{
2510 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2511 event_enabler->enabled = 1;
2512 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2513 mutex_unlock(&sessions_mutex);
2514 return 0;
2515}
2516
7b25ab0e 2517int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler)
3c997079
MD		 2518{
2519 mutex_lock(&sessions_mutex);
7b25ab0e
MD		 2520 event_enabler->enabled = 0;
2521 lttng_event_enabler_sync(event_enabler);
3c997079
MD		 2522 mutex_unlock(&sessions_mutex);
2523 return 0;
2524}
2525
b2bc0bc8 2526static
8d554755 2527int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler,
606828e4 2528 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2529{
d64ca521 2530 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2531 uint32_t bytecode_len;
2532 int ret;
2533
2534 ret = get_user(bytecode_len, &bytecode->len);
2535 if (ret)
2536 return ret;
52cfcdf3 2537 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2538 GFP_KERNEL);
2539 if (!bytecode_node)
2540 return -ENOMEM;
2541 ret = copy_from_user(&bytecode_node->bc, bytecode,
2542 sizeof(*bytecode) + bytecode_len);
2543 if (ret)
2544 goto error_free;
b2bc0bc8 2545
8a445457 2546 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2547 bytecode_node->enabler = enabler;
2548 /* Enforce length based on allocated size */
2549 bytecode_node->bc.len = bytecode_len;
2550 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2551
07dfc1d0
MD		 2552 return 0;
2553
2554error_free:
52cfcdf3 2555 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2556 return ret;
2557}
2558
6048044f 2559int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler,
606828e4 2560 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2561{
2562 int ret;
6048044f 2563 ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode);
b2bc0bc8
FD		 2564 if (ret)
2565 goto error;
7b25ab0e 2566 lttng_event_enabler_sync(event_enabler);
b2bc0bc8
FD		 2567 return 0;
2568
2569error:
2570 return ret;
2571}
2572
e2d5dbc7 2573int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2574 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2575{
2576
e2d5dbc7 2577 switch (event->priv->instrumentation) {
606828e4 2578 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2579 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2580 default:
2581 return -EINVAL;
2582 }
2583}
2584
3c997079 2585static
8d554755 2586void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler)
3c997079 2587{
d64ca521 2588 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2589
2590 /* Destroy filter bytecode */
2591 list_for_each_entry_safe(filter_node, tmp_filter_node,
2592 &enabler->filter_bytecode_head, node) {
52cfcdf3 2593 lttng_kvfree(filter_node);
07dfc1d0 2594 }
b2bc0bc8
FD		 2595}
2596
44b1abdc 2597void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler)
b2bc0bc8 2598{
44b1abdc
MD		 2599 switch (event_enabler->enabler_type) {
2600 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2601 {
2602 struct lttng_event_recorder_enabler *event_recorder_enabler =
2603 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2604
2605 lttng_enabler_destroy(event_enabler);
2606 if (event_recorder_enabler->published)
2607 list_del(&event_recorder_enabler->node);
2608 kfree(event_recorder_enabler);
2609 break;
2610 }
2611 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2612 {
2613 struct lttng_event_notifier_enabler *event_notifier_enabler =
2614 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
07dfc1d0 2615
44b1abdc
MD		 2616 list_del(&event_notifier_enabler->node);
2617 lttng_enabler_destroy(event_enabler);
2618 kfree(event_notifier_enabler);
2619 break;
2620 }
2621 default:
2622 WARN_ON_ONCE(1);
2623 }
3c997079
MD		 2624}
2625
dffef45d
FD		 2626struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2627 struct lttng_event_notifier_group *event_notifier_group,
2628 enum lttng_enabler_format_type format_type,
606828e4 2629 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2630{
2631 struct lttng_event_notifier_enabler *event_notifier_enabler;
2632
2633 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2634 if (!event_notifier_enabler)
2635 return NULL;
2636
0bb716a8 2637 event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER;
5b9817ae
MD		 2638 event_notifier_enabler->parent.format_type = format_type;
2639 INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head);
99d223ad
FD		 2640 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2641
99f52fcc 2642 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2643 event_notifier_enabler->num_captures = 0;
dffef45d 2644
5b9817ae
MD		 2645 memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event,
2646 sizeof(event_notifier_enabler->parent.event_param));
dffef45d 2647
5b9817ae
MD		 2648 event_notifier_enabler->parent.enabled = 0;
2649 event_notifier_enabler->parent.user_token = event_notifier_param->event.token;
dffef45d
FD		 2650 event_notifier_enabler->group = event_notifier_group;
2651
2652 mutex_lock(&sessions_mutex);
2653 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2654 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2655
2656 mutex_unlock(&sessions_mutex);
2657
2658 return event_notifier_enabler;
2659}
2660
2661int lttng_event_notifier_enabler_enable(
2662 struct lttng_event_notifier_enabler *event_notifier_enabler)
2663{
2664 mutex_lock(&sessions_mutex);
2665 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2666 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2667 mutex_unlock(&sessions_mutex);
2668 return 0;
2669}
2670
2671int lttng_event_notifier_enabler_disable(
2672 struct lttng_event_notifier_enabler *event_notifier_enabler)
2673{
2674 mutex_lock(&sessions_mutex);
2675 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2676 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2677 mutex_unlock(&sessions_mutex);
2678 return 0;
2679}
2680
99d223ad
FD		 2681int lttng_event_notifier_enabler_attach_capture_bytecode(
2682 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2683 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2684{
d64ca521 2685 struct lttng_kernel_bytecode_node *bytecode_node;
8d554755 2686 struct lttng_event_enabler_common *enabler =
99d223ad
FD		 2687 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2688 uint32_t bytecode_len;
2689 int ret;
2690
2691 ret = get_user(bytecode_len, &bytecode->len);
2692 if (ret)
2693 return ret;
2694
2695 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2696 GFP_KERNEL);
2697 if (!bytecode_node)
2698 return -ENOMEM;
2699
2700 ret = copy_from_user(&bytecode_node->bc, bytecode,
2701 sizeof(*bytecode) + bytecode_len);
2702 if (ret)
2703 goto error_free;
2704
8a445457 2705 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2706 bytecode_node->enabler = enabler;
2707
2708 /* Enforce length based on allocated size */
2709 bytecode_node->bc.len = bytecode_len;
2710 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2711
2712 event_notifier_enabler->num_captures++;
2713
2714 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2715 goto end;
2716
2717error_free:
2718 lttng_kvfree(bytecode_node);
2719end:
2720 return ret;
2721}
2722
3c997079 2723/*
b2bc0bc8 2724 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2725 * session.
2726 * Should be called with sessions mutex held.
2727 */
2728static
8cdc1a81 2729void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2730{
1ae083ba 2731 struct lttng_event_recorder_enabler *event_enabler;
a67ba386 2732 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2733
8cdc1a81 2734 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2735 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2736 /*
2737 * For each event, if at least one of its enablers is enabled,
2738 * and its channel and session transient states are enabled, we
2739 * enable the event, else we disable it.
2740 */
8cdc1a81 2741 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2742 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2743 struct lttng_enabler_ref *enabler_ref;
218585b9 2744 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2745 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2746 int nr_filters = 0;
3c997079 2747
a67ba386 2748 switch (event_recorder_priv->parent.instrumentation) {
c190d76e
MJ		 2749 case LTTNG_KERNEL_ABI_TRACEPOINT:
2750 lttng_fallthrough;
606828e4 2751 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2752 /* Enable events */
2753 list_for_each_entry(enabler_ref,
a67ba386 2754 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2755 if (enabler_ref->ref->enabled) {
2756 enabled = 1;
2757 break;
2758 }
2759 }
4ecb5ad5 2760 break;
b4a75708 2761
4ecb5ad5 2762 default:
3c997079
MD		 2763 /* Not handled with lazy sync. */
2764 continue;
2765 }
2766 /*
2767 * Enabled state is based on union of enablers, with
2768 * intesection of session and channel transient enable
2769 * states.
2770 */
f7d06400 2771 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2772
a67ba386 2773 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2774 /*
2775 * Sync tracepoint registration with event enabled
2776 * state.
2777 */
2778 if (enabled) {
96c59af1 2779 register_event_recorder(event_recorder);
3c997079 2780 } else {
96c59af1 2781 _lttng_event_recorder_unregister(event_recorder);
3c997079 2782 }
07dfc1d0
MD		 2783
2784 /* Check if has enablers without bytecode enabled */
2785 list_for_each_entry(enabler_ref,
a67ba386 2786 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2787 if (enabler_ref->ref->enabled
2788 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2789 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2790 break;
2791 }
2792 }
a67ba386 2793 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2794 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2795
2796 /* Enable filters */
2797 list_for_each_entry(runtime,
e2d5dbc7 2798 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2799 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2800 nr_filters++;
2801 }
2802 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2803 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2804 }
2805}
2806
2807/*
2808 * Apply enablers to session events, adding events to session if need
2809 * be. It is required after each modification applied to an active
2810 * session, and right before session "start".
2811 * "lazy" sync means we only sync if required.
2812 * Should be called with sessions mutex held.
2813 */
2814static
8cdc1a81 2815void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2816{
2817 /* We can skip if session is not active */
2818 if (!session->active)
2819 return;
b2bc0bc8 2820 lttng_session_sync_event_enablers(session);
3c997079
MD		 2821}
2822
b01155ba
FD		 2823static
2824void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2825{
2826 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2827 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2828
2829 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2830 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2831
2832 /*
2833 * For each event_notifier, if at least one of its enablers is enabled,
2834 * we enable the event_notifier, else we disable it.
2835 */
a67ba386
MD		 2836 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2837 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2838 struct lttng_enabler_ref *enabler_ref;
218585b9 2839 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2840 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2841 int nr_filters = 0, nr_captures = 0;
b01155ba 2842
a67ba386 2843 switch (event_notifier_priv->parent.instrumentation) {
c190d76e
MJ		 2844 case LTTNG_KERNEL_ABI_TRACEPOINT:
2845 lttng_fallthrough;
606828e4 2846 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2847 /* Enable event_notifiers */
2848 list_for_each_entry(enabler_ref,
a67ba386 2849 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2850 if (enabler_ref->ref->enabled) {
2851 enabled = 1;
2852 break;
2853 }
2854 }
2855 break;
b4a75708 2856
b01155ba
FD		 2857 default:
2858 /* Not handled with sync. */
2859 continue;
2860 }
2861
a67ba386 2862 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2863 /*
2864 * Sync tracepoint registration with event_notifier enabled
2865 * state.
2866 */
2867 if (enabled) {
a67ba386 2868 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2869 register_event_notifier(event_notifier);
2870 } else {
a67ba386 2871 if (event_notifier_priv->parent.registered)
b01155ba
FD		 2872 _lttng_event_notifier_unregister(event_notifier);
2873 }
2874
2875 /* Check if has enablers without bytecode enabled */
2876 list_for_each_entry(enabler_ref,
a67ba386 2877 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2878 if (enabler_ref->ref->enabled
2879 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2880 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2881 break;
2882 }
2883 }
a67ba386 2884 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2885 has_enablers_without_filter_bytecode;
b01155ba
FD		 2886
2887 /* Enable filters */
2888 list_for_each_entry(runtime,
e2d5dbc7 2889 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2890 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2891 nr_filters++;
2892 }
2893 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2894 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2895
2896 /* Enable captures */
2897 list_for_each_entry(runtime,
e2d5dbc7 2898 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2899 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2900 nr_captures++;
2901 }
2902 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 2903 }
2904}
2905
7b25ab0e
MD		 2906static
2907void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler)
2908{
2909 switch (event_enabler->enabler_type) {
2910 case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
2911 {
2912 struct lttng_event_recorder_enabler *event_recorder_enabler =
2913 container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
2914 lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session);
2915 break;
2916 }
2917 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
2918 {
2919 struct lttng_event_notifier_enabler *event_notifier_enabler =
2920 container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
2921 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2922 break;
2923 }
2924 default:
2925 WARN_ON_ONCE(1);
2926 }
2927}
2928
1ec3f75a 2929/*
d83004aa
JD		 2930 * Serialize at most one packet worth of metadata into a metadata
2931 * channel.
92d9f5e6
MD		 2932 * We grab the metadata cache mutex to get exclusive access to our metadata
2933 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2934 * allows us to do racy operations such as looking for remaining space left in
2935 * packet and write, since mutual exclusion protects us from concurrent writes.
2936 * Mutual exclusion on the metadata cache allow us to read the cache content
2937 * without racing against reallocation of the cache by updates.
35097f36
JD		 2938 * Returns the number of bytes written in the channel, 0 if no data
2939 * was written and a negative value on error.
1ec3f75a 2940 */
b3b8072b 2941int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
860c213b 2942 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2943{
8a57ec02 2944 struct lttng_kernel_ring_buffer_ctx ctx;
d83004aa
JD		 2945 int ret = 0;
2946 size_t len, reserve_len;
2947
f613e3e6 2948 /*
92d9f5e6
MD		 2949 * Ensure we support mutiple get_next / put sequences followed by
2950 * put_next. The metadata cache lock protects reading the metadata
2951 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2952 * "flush" operations on the buffer invoked by different processes.
2953 * Moreover, since the metadata cache memory can be reallocated, we
2954 * need to have exclusive access against updates even though we only
2955 * read it.
f613e3e6 2956 */
92d9f5e6 2957 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2958 WARN_ON(stream->metadata_in < stream->metadata_out);
2959 if (stream->metadata_in != stream->metadata_out)
de23d59d 2960 goto end;
f613e3e6 2961
9616f0bf
JD		 2962 /* Metadata regenerated, change the version. */
2963 if (stream->metadata_cache->version != stream->version)
2964 stream->version = stream->metadata_cache->version;
2965
d83004aa 2966 len = stream->metadata_cache->metadata_written -
f613e3e6 2967 stream->metadata_in;
9de2c215 2968 if (!len)
de23d59d 2969 goto end;
d83004aa 2970 reserve_len = min_t(size_t,
4a399b76 2971 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2972 len);
a775608d 2973 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
b1199bd3 2974 sizeof(char), NULL);
d83004aa
JD		 2975 /*
2976 * If reservation failed, return an error to the caller.
2977 */
c2fb9c1c 2978 ret = stream->transport->ops.event_reserve(&ctx);
d83004aa
JD		 2979 if (ret != 0) {
2980 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2981 stream->coherent = false;
d83004aa
JD		 2982 goto end;
2983 }
b3b8072b 2984 stream->transport->ops.event_write(&ctx,
f613e3e6 2985 stream->metadata_cache->data + stream->metadata_in,
f5ffbd77 2986 reserve_len, 1);
b3b8072b 2987 stream->transport->ops.event_commit(&ctx);
f613e3e6 2988 stream->metadata_in += reserve_len;
3e75e2a7 2989 if (reserve_len < len)
8b97fd42
MD		 2990 stream->coherent = false;
2991 else
2992 stream->coherent = true;
d83004aa
JD		 2993 ret = reserve_len;
2994
2995end:
8b97fd42
MD		 2996 if (coherent)
2997 *coherent = stream->coherent;
92d9f5e6 2998 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2999 return ret;
3000}
3001
8b97fd42 3002static
8cdc1a81 3003void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 3004{
8cdc1a81
MD		 3005 if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1)
3006 mutex_lock(&session->priv->metadata_cache->lock);
8b97fd42
MD		 3007}
3008
3009static
8cdc1a81 3010void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 3011{
8cdc1a81
MD		 3012 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3013 if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) {
3e75e2a7
MD		 3014 struct lttng_metadata_stream *stream;
3015
8cdc1a81 3016 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 3017 wake_up_interruptible(&stream->read_wait);
8cdc1a81 3018 mutex_unlock(&session->priv->metadata_cache->lock);
3e75e2a7 3019 }
8b97fd42
MD		 3020}
3021
d83004aa
JD		 3022/*
3023 * Write the metadata to the metadata cache.
3024 * Must be called with sessions_mutex held.
92d9f5e6
MD		 3025 * The metadata cache lock protects us from concurrent read access from
3026 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 3027 * The content of the printf is printed as a single atomic metadata
3028 * transaction.
d83004aa 3029 */
8cdc1a81 3030int lttng_metadata_printf(struct lttng_kernel_session *session,
c099397a
MD		 3031 const char *fmt, ...)
3032{
c099397a 3033 char *str;
d83004aa 3034 size_t len;
c099397a
MD		 3035 va_list ap;
3036
585e5dcc 3037 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 3038
3039 va_start(ap, fmt);
3040 str = kvasprintf(GFP_KERNEL, fmt, ap);
3041 va_end(ap);
3042 if (!str)
3043 return -ENOMEM;
3044
1ec3f75a 3045 len = strlen(str);
8cdc1a81
MD		 3046 WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing));
3047 if (session->priv->metadata_cache->metadata_written + len >
3048 session->priv->metadata_cache->cache_alloc) {
d83004aa
JD		 3049 char *tmp_cache_realloc;
3050 unsigned int tmp_cache_alloc_size;
3051
3052 tmp_cache_alloc_size = max_t(unsigned int,
8cdc1a81
MD		 3053 session->priv->metadata_cache->cache_alloc + len,
3054 session->priv->metadata_cache->cache_alloc << 1);
0ca42eb7 3055 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 3056 if (!tmp_cache_realloc)
3057 goto err;
8cdc1a81 3058 if (session->priv->metadata_cache->data) {
a606b6e8 3059 memcpy(tmp_cache_realloc,
8cdc1a81
MD		 3060 session->priv->metadata_cache->data,
3061 session->priv->metadata_cache->cache_alloc);
3062 vfree(session->priv->metadata_cache->data);
a606b6e8
ML		 3063 }
3064
8cdc1a81
MD		 3065 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3066 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3067 }
8cdc1a81
MD		 3068 memcpy(session->priv->metadata_cache->data +
3069 session->priv->metadata_cache->metadata_written,
d83004aa 3070 str, len);
8cdc1a81 3071 session->priv->metadata_cache->metadata_written += len;
c099397a 3072 kfree(str);
d83004aa 3073
d83004aa
JD		 3074 return 0;
3075
3076err:
3077 kfree(str);
3078 return -ENOMEM;
c099397a
MD		 3079}
3080
f513b2bf 3081static
8cdc1a81 3082int print_tabs(struct lttng_kernel_session *session, size_t nesting)
f513b2bf
MD		 3083{
3084 size_t i;
3085
3086 for (i = 0; i < nesting; i++) {
3087 int ret;
3088
3089 ret = lttng_metadata_printf(session, " ");
3090 if (ret) {
3091 return ret;
3092 }
3093 }
3094 return 0;
3095}
3096
ceabb767 3097static
8cdc1a81 3098int lttng_field_name_statedump(struct lttng_kernel_session *session,
437d5aa5 3099 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3100 size_t nesting)
3101{
3102 return lttng_metadata_printf(session, " _%s;\n", field->name);
3103}
3104
3105static
8cdc1a81 3106int _lttng_integer_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3107 const struct lttng_kernel_type_integer *type,
3108 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 3109 size_t nesting)
3110{
3111 int ret;
3112
ceabb767
MD		 3113 ret = print_tabs(session, nesting);
3114 if (ret)
3115 return ret;
3116 ret = lttng_metadata_printf(session,
3117 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
437d5aa5
MD		 3118 type->size,
3119 type->alignment,
3120 type->signedness,
3121 (parent_encoding == lttng_kernel_string_encoding_none)
ceabb767 3122 ? "none"
437d5aa5 3123 : (parent_encoding == lttng_kernel_string_encoding_UTF8)
ceabb767
MD		 3124 ? "UTF8"
3125 : "ASCII",
437d5aa5 3126 type->base,
ceabb767 3127#if __BYTE_ORDER == __BIG_ENDIAN
437d5aa5 3128 type->reverse_byte_order ? " byte_order = le;" : ""
ceabb767 3129#else
437d5aa5 3130 type->reverse_byte_order ? " byte_order = be;" : ""
ceabb767
MD		 3131#endif
3132 );
3133 return ret;
3134}
3135
f513b2bf
MD		 3136/*
3137 * Must be called with sessions_mutex held.
3138 */
3139static
8cdc1a81 3140int _lttng_struct_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3141 const struct lttng_kernel_type_struct *type,
f513b2bf
MD		 3142 size_t nesting)
3143{
51ef4536 3144 const char *prev_field_name = NULL;
f513b2bf
MD		 3145 int ret;
3146 uint32_t i, nr_fields;
ceabb767
MD		 3147 unsigned int alignment;
3148
f513b2bf
MD		 3149 ret = print_tabs(session, nesting);
3150 if (ret)
3151 return ret;
3152 ret = lttng_metadata_printf(session,
3153 "struct {\n");
3154 if (ret)
3155 return ret;
437d5aa5 3156 nr_fields = type->nr_fields;
f513b2bf 3157 for (i = 0; i < nr_fields; i++) {
437d5aa5 3158 const struct lttng_kernel_event_field *iter_field;
f513b2bf 3159
437d5aa5 3160 iter_field = type->fields[i];
51ef4536 3161 ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name);
f513b2bf
MD		 3162 if (ret)
3163 return ret;
3164 }
3165 ret = print_tabs(session, nesting);
3166 if (ret)
3167 return ret;
437d5aa5 3168 alignment = type->alignment;
ceabb767
MD		 3169 if (alignment) {
3170 ret = lttng_metadata_printf(session,
3171 "} align(%u)",
3172 alignment);
3173 } else {
3174 ret = lttng_metadata_printf(session,
3175 "}");
3176 }
f513b2bf
MD		 3177 return ret;
3178}
3179
3180/*
3181 * Must be called with sessions_mutex held.
3182 */
3183static
8cdc1a81 3184int _lttng_struct_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3185 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3186 size_t nesting)
3187{
3188 int ret;
3189
3190 ret = _lttng_struct_type_statedump(session,
437d5aa5 3191 lttng_kernel_get_type_struct(field->type), nesting);
f513b2bf
MD		 3192 if (ret)
3193 return ret;
ceabb767 3194 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3195}
3196
65c85aa6
MD		 3197/*
3198 * Must be called with sessions_mutex held.
3199 */
3200static
8cdc1a81 3201int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3202 const struct lttng_kernel_type_variant *type,
51ef4536
MD		 3203 size_t nesting,
3204 const char *prev_field_name)
65c85aa6 3205{
51ef4536 3206 const char *tag_name;
65c85aa6
MD		 3207 int ret;
3208 uint32_t i, nr_choices;
3209
51ef4536
MD		 3210 tag_name = type->tag_name;
3211 if (!tag_name)
3212 tag_name = prev_field_name;
3213 if (!tag_name)
3214 return -EINVAL;
ceabb767
MD		 3215 /*
3216 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3217 */
437d5aa5 3218 if (type->alignment != 0)
ceabb767 3219 return -EINVAL;
65c85aa6
MD		 3220 ret = print_tabs(session, nesting);
3221 if (ret)
3222 return ret;
3223 ret = lttng_metadata_printf(session,
3224 "variant <_%s> {\n",
51ef4536 3225 tag_name);
65c85aa6
MD		 3226 if (ret)
3227 return ret;
437d5aa5 3228 nr_choices = type->nr_choices;
65c85aa6 3229 for (i = 0; i < nr_choices; i++) {
437d5aa5 3230 const struct lttng_kernel_event_field *iter_field;
65c85aa6 3231
437d5aa5 3232 iter_field = type->choices[i];
51ef4536 3233 ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL);
65c85aa6
MD		 3234 if (ret)
3235 return ret;
3236 }
3237 ret = print_tabs(session, nesting);
3238 if (ret)
3239 return ret;
3240 ret = lttng_metadata_printf(session,
3241 "}");
3242 return ret;
3243}
3244
3245/*
3246 * Must be called with sessions_mutex held.
3247 */
3248static
8cdc1a81 3249int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3250 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3251 size_t nesting,
3252 const char *prev_field_name)
65c85aa6
MD		 3253{
3254 int ret;
3255
3256 ret = _lttng_variant_type_statedump(session,
51ef4536
MD		 3257 lttng_kernel_get_type_variant(field->type), nesting,
3258 prev_field_name);
65c85aa6
MD		 3259 if (ret)
3260 return ret;
ceabb767 3261 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3262}
3263
f513b2bf
MD		 3264/*
3265 * Must be called with sessions_mutex held.
3266 */
3267static
8cdc1a81 3268int _lttng_array_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3269 const struct lttng_kernel_event_field *field,
f513b2bf
MD		 3270 size_t nesting)
3271{
3272 int ret;
437d5aa5
MD		 3273 const struct lttng_kernel_type_array *array_type;
3274 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3275
437d5aa5
MD		 3276 array_type = lttng_kernel_get_type_array(field->type);
3277 WARN_ON_ONCE(!array_type);
ceabb767 3278
437d5aa5 3279 if (array_type->alignment) {
ceabb767 3280 ret = print_tabs(session, nesting);
f513b2bf
MD		 3281 if (ret)
3282 return ret;
ceabb767
MD		 3283 ret = lttng_metadata_printf(session,
3284 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3285 array_type->alignment * CHAR_BIT,
ceabb767
MD		 3286 field->name);
3287 if (ret)
3288 return ret;
3289 }
3290 /*
3291 * Nested compound types: Only array of structures and variants are
3292 * currently supported.
3293 */
437d5aa5 3294 elem_type = array_type->elem_type;
12bb2edb
MD		 3295 switch (elem_type->type) {
3296 case lttng_kernel_type_integer:
437d5aa5
MD		 3297 case lttng_kernel_type_struct:
3298 case lttng_kernel_type_variant:
3299 ret = _lttng_type_statedump(session, elem_type,
3300 array_type->encoding, nesting);
65c85aa6
MD		 3301 if (ret)
3302 return ret;
3303 break;
ceabb767 3304
f513b2bf
MD		 3305 default:
3306 return -EINVAL;
3307 }
3308 ret = lttng_metadata_printf(session,
3309 " _%s[%u];\n",
3310 field->name,
437d5aa5 3311 array_type->length);
f513b2bf
MD		 3312 return ret;
3313}
3314
3315/*
3316 * Must be called with sessions_mutex held.
3317 */
3318static
8cdc1a81 3319int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3320 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3321 size_t nesting,
3322 const char *prev_field_name)
f513b2bf
MD		 3323{
3324 int ret;
3325 const char *length_name;
437d5aa5
MD		 3326 const struct lttng_kernel_type_sequence *sequence_type;
3327 const struct lttng_kernel_type_common *elem_type;
f513b2bf 3328
437d5aa5
MD		 3329 sequence_type = lttng_kernel_get_type_sequence(field->type);
3330 WARN_ON_ONCE(!sequence_type);
f513b2bf 3331
437d5aa5 3332 length_name = sequence_type->length_name;
51ef4536
MD		 3333 if (!length_name)
3334 length_name = prev_field_name;
3335 if (!length_name)
3336 return -EINVAL;
ceabb767 3337
437d5aa5 3338 if (sequence_type->alignment) {
ceabb767 3339 ret = print_tabs(session, nesting);
f513b2bf
MD		 3340 if (ret)
3341 return ret;
ceabb767
MD		 3342 ret = lttng_metadata_printf(session,
3343 "struct { } align(%u) _%s_padding;\n",
437d5aa5 3344 sequence_type->alignment * CHAR_BIT,
ceabb767
MD		 3345 field->name);
3346 if (ret)
3347 return ret;
3348 }
3349
3350 /*
3351 * Nested compound types: Only array of structures and variants are
3352 * currently supported.
3353 */
437d5aa5 3354 elem_type = sequence_type->elem_type;
12bb2edb
MD		 3355 switch (elem_type->type) {
3356 case lttng_kernel_type_integer:
437d5aa5
MD		 3357 case lttng_kernel_type_struct:
3358 case lttng_kernel_type_variant:
3359 ret = _lttng_type_statedump(session, elem_type,
3360 sequence_type->encoding, nesting);
65c85aa6
MD		 3361 if (ret)
3362 return ret;
3363 break;
ceabb767 3364
f513b2bf
MD		 3365 default:
3366 return -EINVAL;
3367 }
3368 ret = lttng_metadata_printf(session,
3369 " _%s[ _%s ];\n",
3370 field->name,
51ef4536 3371 length_name);
f513b2bf
MD		 3372 return ret;
3373}
3374
141ddf28
MD		 3375/*
3376 * Must be called with sessions_mutex held.
3377 */
3378static
8cdc1a81 3379int _lttng_enum_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3380 const struct lttng_kernel_type_enum *type,
141ddf28
MD		 3381 size_t nesting)
3382{
d96a4a7a 3383 const struct lttng_kernel_enum_desc *enum_desc;
437d5aa5 3384 const struct lttng_kernel_type_common *container_type;
141ddf28
MD		 3385 int ret;
3386 unsigned int i, nr_entries;
3387
437d5aa5 3388 container_type = type->container_type;
12bb2edb 3389 if (container_type->type != lttng_kernel_type_integer) {
ceabb767
MD		 3390 ret = -EINVAL;
3391 goto end;
3392 }
437d5aa5 3393 enum_desc = type->desc;
141ddf28
MD		 3394 nr_entries = enum_desc->nr_entries;
3395
3396 ret = print_tabs(session, nesting);
3397 if (ret)
3398 goto end;
ceabb767
MD		 3399 ret = lttng_metadata_printf(session, "enum : ");
3400 if (ret)
3401 goto end;
437d5aa5
MD		 3402 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type),
3403 lttng_kernel_string_encoding_none, 0);
141ddf28 3404 if (ret)
ceabb767
MD		 3405 goto end;
3406 ret = lttng_metadata_printf(session, " {\n");
3407 if (ret)
3408 goto end;
141ddf28
MD		 3409 /* Dump all entries */
3410 for (i = 0; i < nr_entries; i++) {
437d5aa5 3411 const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i];
141ddf28
MD		 3412 int j, len;
3413
3414 ret = print_tabs(session, nesting + 1);
3415 if (ret)
3416 goto end;
3417 ret = lttng_metadata_printf(session,
3418 "\"");
3419 if (ret)
3420 goto end;
3421 len = strlen(entry->string);
3422 /* Escape the character '"' */
3423 for (j = 0; j < len; j++) {
3424 char c = entry->string[j];
3425
3426 switch (c) {
3427 case '"':
3428 ret = lttng_metadata_printf(session,
3429 "\\\"");
3430 break;
3431 case '\\':
3432 ret = lttng_metadata_printf(session,
3433 "\\\\");
3434 break;
3435 default:
3436 ret = lttng_metadata_printf(session,
3437 "%c", c);
3438 break;
3439 }
3440 if (ret)
3441 goto end;
3442 }
08ad1061
PP		 3443 ret = lttng_metadata_printf(session, "\"");
3444 if (ret)
3445 goto end;
3446
3447 if (entry->options.is_auto) {
3448 ret = lttng_metadata_printf(session, ",\n");
3449 if (ret)
3450 goto end;
141ddf28 3451 } else {
7c559490
MD		 3452 ret = lttng_metadata_printf(session,
3453 " = ");
3454 if (ret)
3455 goto end;
3456 if (entry->start.signedness)
141ddf28 3457 ret = lttng_metadata_printf(session,
7c559490
MD		 3458 "%lld", (long long) entry->start.value);
3459 else
3460 ret = lttng_metadata_printf(session,
3461 "%llu", entry->start.value);
3462 if (ret)
3463 goto end;
3464 if (entry->start.signedness == entry->end.signedness &&
3465 entry->start.value
3466 == entry->end.value) {
141ddf28 3467 ret = lttng_metadata_printf(session,
7c559490
MD		 3468 ",\n");
3469 } else {
3470 if (entry->end.signedness) {
3471 ret = lttng_metadata_printf(session,
3472 " ... %lld,\n",
3473 (long long) entry->end.value);
3474 } else {
3475 ret = lttng_metadata_printf(session,
3476 " ... %llu,\n",
3477 entry->end.value);
3478 }
141ddf28 3479 }
7c559490
MD		 3480 if (ret)
3481 goto end;
141ddf28 3482 }
141ddf28
MD		 3483 }
3484 ret = print_tabs(session, nesting);
3485 if (ret)
3486 goto end;
ceabb767 3487 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3488end:
3489 return ret;
3490}
3491
d83004aa
JD		 3492/*
3493 * Must be called with sessions_mutex held.
3494 */
c099397a 3495static
8cdc1a81 3496int _lttng_enum_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3497 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3498 size_t nesting)
3499{
3500 int ret;
437d5aa5 3501 const struct lttng_kernel_type_enum *enum_type;
ceabb767 3502
437d5aa5
MD		 3503 enum_type = lttng_kernel_get_type_enum(field->type);
3504 WARN_ON_ONCE(!enum_type);
3505 ret = _lttng_enum_type_statedump(session, enum_type, nesting);
ceabb767
MD		 3506 if (ret)
3507 return ret;
3508 return lttng_field_name_statedump(session, field, nesting);
3509}
3510
3511static
8cdc1a81 3512int _lttng_integer_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3513 const struct lttng_kernel_event_field *field,
ceabb767
MD		 3514 size_t nesting)
3515{
3516 int ret;
3517
437d5aa5
MD		 3518 ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type),
3519 lttng_kernel_string_encoding_none, nesting);
ceabb767
MD		 3520 if (ret)
3521 return ret;
3522 return lttng_field_name_statedump(session, field, nesting);
3523}
3524
3525static
8cdc1a81 3526int _lttng_string_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3527 const struct lttng_kernel_type_string *type,
ceabb767
MD		 3528 size_t nesting)
3529{
3530 int ret;
3531
ceabb767
MD		 3532 /* Default encoding is UTF8 */
3533 ret = print_tabs(session, nesting);
3534 if (ret)
3535 return ret;
3536 ret = lttng_metadata_printf(session,
3537 "string%s",
437d5aa5 3538 type->encoding == lttng_kernel_string_encoding_ASCII ?
ceabb767
MD		 3539 " { encoding = ASCII; }" : "");
3540 return ret;
3541}
3542
3543static
8cdc1a81 3544int _lttng_string_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3545 const struct lttng_kernel_event_field *field,
f513b2bf 3546 size_t nesting)
ceabb767 3547{
437d5aa5 3548 const struct lttng_kernel_type_string *string_type;
ceabb767
MD		 3549 int ret;
3550
437d5aa5
MD		 3551 string_type = lttng_kernel_get_type_string(field->type);
3552 WARN_ON_ONCE(!string_type);
3553 ret = _lttng_string_type_statedump(session, string_type, nesting);
ceabb767
MD		 3554 if (ret)
3555 return ret;
3556 return lttng_field_name_statedump(session, field, nesting);
3557}
3558
3559/*
3560 * Must be called with sessions_mutex held.
3561 */
3562static
8cdc1a81 3563int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 3564 const struct lttng_kernel_type_common *type,
3565 enum lttng_kernel_string_encoding parent_encoding,
ceabb767 3566 size_t nesting)
c099397a 3567{
c099397a 3568 int ret = 0;
c099397a 3569
12bb2edb
MD		 3570 switch (type->type) {
3571 case lttng_kernel_type_integer:
437d5aa5
MD		 3572 ret = _lttng_integer_type_statedump(session,
3573 lttng_kernel_get_type_integer(type),
3574 parent_encoding, nesting);
8070f5c0 3575 break;
437d5aa5
MD		 3576 case lttng_kernel_type_enum:
3577 ret = _lttng_enum_type_statedump(session,
3578 lttng_kernel_get_type_enum(type),
3579 nesting);
8070f5c0 3580 break;
12bb2edb 3581 case lttng_kernel_type_string:
437d5aa5
MD		 3582 ret = _lttng_string_type_statedump(session,
3583 lttng_kernel_get_type_string(type),
3584 nesting);
ceabb767 3585 break;
437d5aa5
MD		 3586 case lttng_kernel_type_struct:
3587 ret = _lttng_struct_type_statedump(session,
3588 lttng_kernel_get_type_struct(type),
3589 nesting);
8070f5c0 3590 break;
437d5aa5
MD		 3591 case lttng_kernel_type_variant:
3592 ret = _lttng_variant_type_statedump(session,
3593 lttng_kernel_get_type_variant(type),
51ef4536 3594 nesting, NULL);
ceabb767
MD		 3595 break;
3596
3597 /* Nested arrays and sequences are not supported yet. */
437d5aa5
MD		 3598 case lttng_kernel_type_array:
3599 case lttng_kernel_type_sequence:
ceabb767
MD		 3600 default:
3601 WARN_ON_ONCE(1);
3602 return -EINVAL;
8070f5c0 3603 }
ceabb767
MD		 3604 return ret;
3605}
8070f5c0 3606
ceabb767
MD		 3607/*
3608 * Must be called with sessions_mutex held.
3609 */
3610static
8cdc1a81 3611int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3612 const struct lttng_kernel_event_field *field,
51ef4536
MD		 3613 size_t nesting,
3614 const char **prev_field_name_p)
ceabb767 3615{
51ef4536 3616 const char *prev_field_name = NULL;
ceabb767 3617 int ret = 0;
27d2368e 3618
51ef4536
MD		 3619 if (prev_field_name_p)
3620 prev_field_name = *prev_field_name_p;
437d5aa5 3621 switch (field->type->type) {
12bb2edb 3622 case lttng_kernel_type_integer:
ceabb767
MD		 3623 ret = _lttng_integer_field_statedump(session, field, nesting);
3624 break;
437d5aa5 3625 case lttng_kernel_type_enum:
ceabb767 3626 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3627 break;
12bb2edb 3628 case lttng_kernel_type_string:
ceabb767 3629 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3630 break;
437d5aa5 3631 case lttng_kernel_type_struct:
ceabb767 3632 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3633 break;
437d5aa5 3634 case lttng_kernel_type_array:
ceabb767 3635 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3636 break;
437d5aa5 3637 case lttng_kernel_type_sequence:
51ef4536 3638 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3639 break;
437d5aa5 3640 case lttng_kernel_type_variant:
51ef4536 3641 ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name);
65c85aa6 3642 break;
f513b2bf 3643
8070f5c0
MD		 3644 default:
3645 WARN_ON_ONCE(1);
3646 return -EINVAL;
3647 }
51ef4536
MD		 3648 if (prev_field_name_p)
3649 *prev_field_name_p = field->name;
8070f5c0
MD		 3650 return ret;
3651}
3652
3653static
8cdc1a81 3654int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3655 struct lttng_kernel_ctx *ctx)
8070f5c0 3656{
51ef4536 3657 const char *prev_field_name = NULL;
8070f5c0
MD		 3658 int ret = 0;
3659 int i;
3660
3661 if (!ctx)
3662 return 0;
3663 for (i = 0; i < ctx->nr_fields; i++) {
437d5aa5 3664 const struct lttng_kernel_ctx_field *field = &ctx->fields[i];
8070f5c0 3665
51ef4536 3666 ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name);
8070f5c0
MD		 3667 if (ret)
3668 return ret;
3669 }
3670 return ret;
3671}
3672
3673static
8cdc1a81 3674int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3675 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3676{
51ef4536 3677 const char *prev_field_name = NULL;
a67ba386 3678 const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc;
8070f5c0
MD		 3679 int ret = 0;
3680 int i;
3681
6c8c025b
MD		 3682 for (i = 0; i < desc->tp_class->nr_fields; i++) {
3683 const struct lttng_kernel_event_field *field = desc->tp_class->fields[i];
8070f5c0 3684
51ef4536 3685 ret = _lttng_field_statedump(session, field, 2, &prev_field_name);
8070f5c0
MD		 3686 if (ret)
3687 return ret;
c099397a
MD		 3688 }
3689 return ret;
3690}
3691
d83004aa
JD		 3692/*
3693 * Must be called with sessions_mutex held.
8b97fd42
MD		 3694 * The entire event metadata is printed as a single atomic metadata
3695 * transaction.
d83004aa 3696 */
c099397a 3697static
8cdc1a81 3698int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3699 struct lttng_kernel_channel_buffer *chan,
a67ba386 3700 struct lttng_kernel_event_recorder *event_recorder)
c099397a
MD		 3701{
3702 int ret = 0;
3703
a67ba386 3704 if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3705 return 0;
f7d06400 3706 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3707 return 0;
3708
8b97fd42
MD		 3709 lttng_metadata_begin(session);
3710
c099397a
MD		 3711 ret = lttng_metadata_printf(session,
3712 "event {\n"
ae734547 3713 " name = \"%s\";\n"
c099397a 3714 " id = %u;\n"
b9074a1b 3715 " stream_id = %u;\n",
a67ba386
MD		 3716 event_recorder->priv->parent.desc->event_name,
3717 event_recorder->priv->id,
f7d06400 3718 event_recorder->chan->priv->id);
c099397a
MD		 3719 if (ret)
3720 goto end;
3721
8070f5c0 3722 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3723 " fields := struct {\n"
3724 );
3725 if (ret)
3726 goto end;
3727
a67ba386 3728 ret = _lttng_fields_metadata_statedump(session, event_recorder);
c099397a
MD		 3729 if (ret)
3730 goto end;
3731
3732 /*
3733 * LTTng space reservation can only reserve multiples of the
3734 * byte size.
3735 */
3736 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3737 " };\n"
3738 "};\n\n");
c099397a
MD		 3739 if (ret)
3740 goto end;
3741
a67ba386 3742 event_recorder->priv->metadata_dumped = 1;
c099397a 3743end:
8b97fd42 3744 lttng_metadata_end(session);
c099397a
MD		 3745 return ret;
3746
3747}
3748
d83004aa
JD		 3749/*
3750 * Must be called with sessions_mutex held.
8b97fd42
MD		 3751 * The entire channel metadata is printed as a single atomic metadata
3752 * transaction.
d83004aa 3753 */
c099397a 3754static
8cdc1a81 3755int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
f7d06400 3756 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3757{
3758 int ret = 0;
3759
f7d06400 3760 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3761 return 0;
d83004aa 3762
f7d06400 3763 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3764 return 0;
3765
8b97fd42
MD		 3766 lttng_metadata_begin(session);
3767
f7d06400 3768 WARN_ON_ONCE(!chan->priv->header_type);
c099397a
MD		 3769 ret = lttng_metadata_printf(session,
3770 "stream {\n"
3771 " id = %u;\n"
9115fbdc 3772 " event.header := %s;\n"
b9074a1b 3773 " packet.context := struct packet_context;\n",
f7d06400
MD		 3774 chan->priv->id,
3775 chan->priv->header_type == 1 ? "struct event_header_compact" :
c099397a
MD		 3776 "struct event_header_large");
3777 if (ret)
3778 goto end;
3779
f7d06400 3780 if (chan->priv->ctx) {
b9074a1b
MD		 3781 ret = lttng_metadata_printf(session,
3782 " event.context := struct {\n");
3783 if (ret)
3784 goto end;
3785 }
f7d06400 3786 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3787 if (ret)
3788 goto end;
f7d06400 3789 if (chan->priv->ctx) {
b9074a1b
MD		 3790 ret = lttng_metadata_printf(session,
3791 " };\n");
3792 if (ret)
3793 goto end;
3794 }
8070f5c0
MD		 3795
3796 ret = lttng_metadata_printf(session,
b9074a1b 3797 "};\n\n");
8070f5c0 3798
f7d06400 3799 chan->priv->metadata_dumped = 1;
c099397a 3800end:
8b97fd42 3801 lttng_metadata_end(session);
c099397a
MD		 3802 return ret;
3803}
3804
d83004aa
JD		 3805/*
3806 * Must be called with sessions_mutex held.
3807 */
9115fbdc 3808static
8cdc1a81 3809int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3810{
3811 return lttng_metadata_printf(session,
3812 "struct packet_context {\n"
a3ccff4f
MD		 3813 " uint64_clock_monotonic_t timestamp_begin;\n"
3814 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3815 " uint64_t content_size;\n"
3816 " uint64_t packet_size;\n"
5b3cf4f9 3817 " uint64_t packet_seq_num;\n"
a9afe705 3818 " unsigned long events_discarded;\n"
9115fbdc 3819 " uint32_t cpu_id;\n"
c6dfdf6f 3820 "};\n\n"
9115fbdc
MD		 3821 );
3822}
3823
3824/*
3825 * Compact header:
3826 * id: range: 0 - 30.
3827 * id 31 is reserved to indicate an extended header.
3828 *
3829 * Large header:
3830 * id: range: 0 - 65534.
3831 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3832 *
3833 * Must be called with sessions_mutex held.
9115fbdc
MD		 3834 */
3835static
8cdc1a81 3836int _lttng_event_header_declare(struct lttng_kernel_session *session)
9115fbdc
MD		 3837{
3838 return lttng_metadata_printf(session,
3839 "struct event_header_compact {\n"
3840 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3841 " variant <id> {\n"
3842 " struct {\n"
a3ccff4f 3843 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3844 " } compact;\n"
3845 " struct {\n"
3846 " uint32_t id;\n"
a3ccff4f 3847 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3848 " } extended;\n"
3849 " } v;\n"
3850 "} align(%u);\n"
3851 "\n"
3852 "struct event_header_large {\n"
3853 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3854 " variant <id> {\n"
3855 " struct {\n"
a3ccff4f 3856 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3857 " } compact;\n"
3858 " struct {\n"
3859 " uint32_t id;\n"
a3ccff4f 3860 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3861 " } extended;\n"
3862 " } v;\n"
3863 "} align(%u);\n\n",
a90917c3
MD		 3864 lttng_alignof(uint32_t) * CHAR_BIT,
3865 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3866 );
3867}
3868
a3ccff4f
MD		 3869 /*
3870 * Approximation of NTP time of day to clock monotonic correlation,
3871 * taken at start of trace.
3872 * Yes, this is only an approximation. Yes, we can (and will) do better
3873 * in future versions.
5283350b
MD		 3874 * This function may return a negative offset. It may happen if the
3875 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3876 *
3877 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3878 * y2038 compliant.
a3ccff4f
MD		 3879 */
3880static
8967b2a3 3881int64_t measure_clock_offset(void)
a3ccff4f 3882{
dcb93448 3883 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3884 uint64_t tcf = trace_clock_freq();
dcb93448 3885 int64_t offset;
a3ccff4f 3886 unsigned long flags;
3636085f
MJ		 3887#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3888 struct timespec64 rts = { 0, 0 };
3889#else
3890 struct timespec rts = { 0, 0 };
3891#endif
a3ccff4f
MD		 3892
3893 /* Disable interrupts to increase correlation precision. */
3894 local_irq_save(flags);
3895 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3896#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3897 ktime_get_real_ts64(&rts);
3898#else
216b6baa 3899 getnstimeofday(&rts);
3636085f 3900#endif
a3ccff4f
MD		 3901 monotonic[1] = trace_clock_read64();
3902 local_irq_restore(flags);
3903
dcb93448 3904 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3905 realtime = (uint64_t) rts.tv_sec * tcf;
3906 if (tcf == NSEC_PER_SEC) {
3907 realtime += rts.tv_nsec;
3908 } else {
3909 uint64_t n = rts.tv_nsec * tcf;
3910
3911 do_div(n, NSEC_PER_SEC);
3912 realtime += n;
3913 }
dcb93448 3914 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3915 return offset;
3916}
3917
3eb95be4 3918static
8cdc1a81 3919int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string)
3eb95be4 3920{
0f3eaad4 3921 int ret = 0;
3eb95be4
JR		 3922 size_t i;
3923 char cur;
3924
3925 i = 0;
3926 cur = string[i];
3927 while (cur != '\0') {
3928 switch (cur) {
3929 case '\n':
3930 ret = lttng_metadata_printf(session, "%s", "\\n");
3931 break;
3932 case '\\':
3933 case '"':
3934 ret = lttng_metadata_printf(session, "%c", '\\');
3935 if (ret)
3936 goto error;
3937 /* We still print the current char */
c190d76e 3938 lttng_fallthrough;
3eb95be4
JR		 3939 default:
3940 ret = lttng_metadata_printf(session, "%c", cur);
3941 break;
3942 }
3943
3944 if (ret)
3945 goto error;
3946
3947 cur = string[++i];
3948 }
3949error:
3950 return ret;
3951}
3952
3953static
8cdc1a81 3954int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field,
1c88f269 3955 const char *field_value)
3eb95be4
JR		 3956{
3957 int ret;
3958
1c88f269 3959 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3960 if (ret)
3961 goto error;
3962
1c88f269 3963 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3964 if (ret)
3965 goto error;
3966
3967 ret = lttng_metadata_printf(session, "\";\n");
3968
3969error:
3970 return ret;
3971}
3972
c099397a
MD		 3973/*
3974 * Output metadata into this session's metadata buffers.
d83004aa 3975 * Must be called with sessions_mutex held.
c099397a
MD		 3976 */
3977static
8cdc1a81 3978int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3979{
8cdc1a81 3980 unsigned char *uuid_c = session->priv->uuid.b;
a82c63f1 3981 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3982 const char *product_uuid;
f7d06400 3983 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 3984 struct lttng_kernel_event_recorder_private *event_recorder_priv;
c099397a
MD		 3985 int ret = 0;
3986
585e5dcc 3987 if (!LTTNG_READ_ONCE(session->active))
c099397a 3988 return 0;
8b97fd42
MD		 3989
3990 lttng_metadata_begin(session);
3991
8cdc1a81 3992 if (session->priv->metadata_dumped)
c099397a 3993 goto skip_session;
c099397a 3994
d793d5e1 3995 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3996 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3997 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3998 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3999 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
4000 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 4001
4002 ret = lttng_metadata_printf(session,
9115fbdc
MD		 4003 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4004 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4005 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4006 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 4007 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 4008 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4009 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 4010 "\n"
4011 "trace {\n"
4012 " major = %u;\n"
4013 " minor = %u;\n"
30bdb6e4 4014 " uuid = \"%s\";\n"
d793d5e1
MD		 4015 " byte_order = %s;\n"
4016 " packet.header := struct {\n"
4017 " uint32_t magic;\n"
1ec3f75a 4018 " uint8_t uuid[16];\n"
d793d5e1 4019 " uint32_t stream_id;\n"
5594698f 4020 " uint64_t stream_instance_id;\n"
0eb25f58 4021 " };\n"
d793d5e1 4022 "};\n\n",
a90917c3
MD		 4023 lttng_alignof(uint8_t) * CHAR_BIT,
4024 lttng_alignof(uint16_t) * CHAR_BIT,
4025 lttng_alignof(uint32_t) * CHAR_BIT,
4026 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 4027 sizeof(unsigned long) * CHAR_BIT,
4028 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 4029 CTF_SPEC_MAJOR,
4030 CTF_SPEC_MINOR,
d793d5e1 4031 uuid_s,
5214fa50 4032#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 4033 "be"
4034#else
4035 "le"
4036#endif
4037 );
4038 if (ret)
4039 goto end;
4040
99dc9597
MD		 4041 ret = lttng_metadata_printf(session,
4042 "env {\n"
a6058143 4043 " hostname = \"%s\";\n"
c6c9e10f 4044 " domain = \"kernel\";\n"
99dc9597 4045 " sysname = \"%s\";\n"
c6c9e10f
MD		 4046 " kernel_release = \"%s\";\n"
4047 " kernel_version = \"%s\";\n"
4048 " tracer_name = \"lttng-modules\";\n"
4049 " tracer_major = %d;\n"
4050 " tracer_minor = %d;\n"
4051 " tracer_patchlevel = %d;\n"
3eb95be4 4052 " trace_buffering_scheme = \"global\";\n",
3d0d43db 4053 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 4054 utsname()->sysname,
4055 utsname()->release,
c6c9e10f
MD		 4056 utsname()->version,
4057 LTTNG_MODULES_MAJOR_VERSION,
4058 LTTNG_MODULES_MINOR_VERSION,
4059 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 4060 );
4061 if (ret)
4062 goto end;
4063
8cdc1a81 4064 ret = print_metadata_escaped_field(session, "trace_name", session->priv->name);
1c88f269
JR		 4065 if (ret)
4066 goto end;
4067 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
8cdc1a81 4068 session->priv->creation_time);
3eb95be4
JR		 4069 if (ret)
4070 goto end;
4071
c88f762e
GB		 4072 /* Add the product UUID to the 'env' section */
4073 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
4074 if (product_uuid) {
4075 ret = lttng_metadata_printf(session,
4076 " product_uuid = \"%s\";\n",
4077 product_uuid
4078 );
4079 if (ret)
4080 goto end;
4081 }
4082
4083 /* Close the 'env' section */
3eb95be4
JR		 4084 ret = lttng_metadata_printf(session, "};\n\n");
4085 if (ret)
4086 goto end;
4087
a3ccff4f
MD		 4088 ret = lttng_metadata_printf(session,
4089 "clock {\n"
2754583e
MD		 4090 " name = \"%s\";\n",
4091 trace_clock_name()
a82c63f1
MD		 4092 );
4093 if (ret)
4094 goto end;
4095
4096 if (!trace_clock_uuid(clock_uuid_s)) {
4097 ret = lttng_metadata_printf(session,
7c27cb17 4098 " uuid = \"%s\";\n",
a82c63f1
MD		 4099 clock_uuid_s
4100 );
4101 if (ret)
4102 goto end;
4103 }
4104
4105 ret = lttng_metadata_printf(session,
2754583e 4106 " description = \"%s\";\n"
a3ccff4f
MD		 4107 " freq = %llu; /* Frequency, in Hz */\n"
4108 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 4109 " offset = %lld;\n"
a3ccff4f 4110 "};\n\n",
2754583e 4111 trace_clock_description(),
a3ccff4f 4112 (unsigned long long) trace_clock_freq(),
8967b2a3 4113 (long long) measure_clock_offset()
a3ccff4f
MD		 4114 );
4115 if (ret)
4116 goto end;
4117
4118 ret = lttng_metadata_printf(session,
4119 "typealias integer {\n"
4120 " size = 27; align = 1; signed = false;\n"
2754583e 4121 " map = clock.%s.value;\n"
a3ccff4f
MD		 4122 "} := uint27_clock_monotonic_t;\n"
4123 "\n"
4124 "typealias integer {\n"
4125 " size = 32; align = %u; signed = false;\n"
2754583e 4126 " map = clock.%s.value;\n"
a3ccff4f
MD		 4127 "} := uint32_clock_monotonic_t;\n"
4128 "\n"
4129 "typealias integer {\n"
4130 " size = 64; align = %u; signed = false;\n"
2754583e 4131 " map = clock.%s.value;\n"
a3ccff4f 4132 "} := uint64_clock_monotonic_t;\n\n",
2754583e 4133 trace_clock_name(),
a3ccff4f 4134 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 4135 trace_clock_name(),
4136 lttng_alignof(uint64_t) * CHAR_BIT,
4137 trace_clock_name()
a3ccff4f
MD		 4138 );
4139 if (ret)
4140 goto end;
4141
a90917c3 4142 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 4143 if (ret)
4144 goto end;
4145
a90917c3 4146 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 4147 if (ret)
4148 goto end;
4149
c099397a 4150skip_session:
f7d06400
MD		 4151 list_for_each_entry(chan_priv, &session->priv->chan, node) {
4152 ret = _lttng_channel_metadata_statedump(session, chan_priv->pub);
c099397a
MD		 4153 if (ret)
4154 goto end;
4155 }
4156
8cdc1a81 4157 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386
MD		 4158 ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan,
4159 event_recorder_priv->pub);
c099397a
MD		 4160 if (ret)
4161 goto end;
4162 }
8cdc1a81 4163 session->priv->metadata_dumped = 1;
c099397a 4164end:
8b97fd42 4165 lttng_metadata_end(session);
c099397a
MD		 4166 return ret;
4167}
4168
c0e31d2e 4169/**
a90917c3 4170 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 4171 * @transport: transport structure
4172 *
4173 * Registers a transport which can be used as output to extract the data out of
4174 * LTTng. The module calling this registration function must ensure that no
4175 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 4176 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 4177 * is made visible to the transport function. This registration acts as a
263b6c88 4178 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 4179 * after its registration must it synchronize the TLBs.
4180 */
a90917c3 4181void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 4182{
4183 /*
4184 * Make sure no page fault can be triggered by the module about to be
4185 * registered. We deal with this here so we don't have to call
263b6c88 4186 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 4187 */
263b6c88 4188 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 4189
4190 mutex_lock(&sessions_mutex);
a90917c3 4191 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 4192 mutex_unlock(&sessions_mutex);
4193}
a90917c3 4194EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 4195
4196/**
a90917c3 4197 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 4198 * @transport: transport structure
4199 */
a90917c3 4200void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4201{
4202 mutex_lock(&sessions_mutex);
4203 list_del(&transport->node);
4204 mutex_unlock(&sessions_mutex);
4205}
a90917c3 4206EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4207
a101fa10
MD		 4208void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4209{
4210 /*
4211 * Make sure no page fault can be triggered by the module about to be
4212 * registered. We deal with this here so we don't have to call
4213 * vmalloc_sync_mappings() in each module's init.
4214 */
4215 wrapper_vmalloc_sync_mappings();
4216
4217 mutex_lock(&sessions_mutex);
4218 list_add_tail(&transport->node, &lttng_counter_transport_list);
4219 mutex_unlock(&sessions_mutex);
4220}
4221EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4222
4223void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4224{
4225 mutex_lock(&sessions_mutex);
4226 list_del(&transport->node);
4227 mutex_unlock(&sessions_mutex);
4228}
4229EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4230
5f4c791e 4231#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4232
4233enum cpuhp_state lttng_hp_prepare;
4234enum cpuhp_state lttng_hp_online;
4235
4236static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4237{
4238 struct lttng_cpuhp_node *lttng_node;
4239
4240 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4241 switch (lttng_node->component) {
4242 case LTTNG_RING_BUFFER_FRONTEND:
4243 return 0;
4244 case LTTNG_RING_BUFFER_BACKEND:
4245 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4246 case LTTNG_RING_BUFFER_ITER:
4247 return 0;
4248 case LTTNG_CONTEXT_PERF_COUNTERS:
4249 return 0;
4250 default:
4251 return -EINVAL;
4252 }
4253}
4254
4255static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4256{
4257 struct lttng_cpuhp_node *lttng_node;
4258
4259 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4260 switch (lttng_node->component) {
4261 case LTTNG_RING_BUFFER_FRONTEND:
4262 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4263 case LTTNG_RING_BUFFER_BACKEND:
4264 return 0;
4265 case LTTNG_RING_BUFFER_ITER:
4266 return 0;
4267 case LTTNG_CONTEXT_PERF_COUNTERS:
4268 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4269 default:
4270 return -EINVAL;
4271 }
4272}
4273
4274static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4275{
4276 struct lttng_cpuhp_node *lttng_node;
4277
4278 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4279 switch (lttng_node->component) {
4280 case LTTNG_RING_BUFFER_FRONTEND:
4281 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4282 case LTTNG_RING_BUFFER_BACKEND:
4283 return 0;
4284 case LTTNG_RING_BUFFER_ITER:
4285 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4286 case LTTNG_CONTEXT_PERF_COUNTERS:
4287 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4288 default:
4289 return -EINVAL;
4290 }
4291}
4292
4293static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4294{
4295 struct lttng_cpuhp_node *lttng_node;
4296
4297 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4298 switch (lttng_node->component) {
4299 case LTTNG_RING_BUFFER_FRONTEND:
4300 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4301 case LTTNG_RING_BUFFER_BACKEND:
4302 return 0;
4303 case LTTNG_RING_BUFFER_ITER:
4304 return 0;
4305 case LTTNG_CONTEXT_PERF_COUNTERS:
4306 return 0;
4307 default:
4308 return -EINVAL;
4309 }
4310}
4311
4312static int __init lttng_init_cpu_hotplug(void)
4313{
4314 int ret;
4315
4316 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4317 lttng_hotplug_prepare,
4318 lttng_hotplug_dead);
4319 if (ret < 0) {
4320 return ret;
4321 }
4322 lttng_hp_prepare = ret;
4323 lttng_rb_set_hp_prepare(ret);
4324
4325 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4326 lttng_hotplug_online,
4327 lttng_hotplug_offline);
4328 if (ret < 0) {
4329 cpuhp_remove_multi_state(lttng_hp_prepare);
4330 lttng_hp_prepare = 0;
4331 return ret;
4332 }
4333 lttng_hp_online = ret;
4334 lttng_rb_set_hp_online(ret);
4335
4336 return 0;
4337}
4338
4339static void __exit lttng_exit_cpu_hotplug(void)
4340{
4341 lttng_rb_set_hp_online(0);
4342 cpuhp_remove_multi_state(lttng_hp_online);
4343 lttng_rb_set_hp_prepare(0);
4344 cpuhp_remove_multi_state(lttng_hp_prepare);
4345}
4346
5f4c791e 4347#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4348static int lttng_init_cpu_hotplug(void)
4349{
4350 return 0;
4351}
4352static void lttng_exit_cpu_hotplug(void)
4353{
4354}
5f4c791e 4355#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326 4356
a90917c3 4357static int __init lttng_events_init(void)
4e3c1b9b 4358{
1c25284c
MD		 4359 int ret;
4360
453b2495
JD		 4361 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4362 if (ret)
4363 return ret;
389d7070 4364 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4365 if (ret)
4366 return ret;
4367 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4368 if (ret)
4369 return ret;
4370 ret = lttng_probes_init();
389d7070
MD		 4371 if (ret)
4372 return ret;
07dfc1d0 4373 ret = lttng_context_init();
20591cf7
MD		 4374 if (ret)
4375 return ret;
07dfc1d0
MD		 4376 ret = lttng_tracepoint_init();
4377 if (ret)
4378 goto error_tp;
a67ba386
MD		 4379 event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0);
4380 if (!event_recorder_cache) {
20591cf7 4381 ret = -ENOMEM;
a67ba386 4382 goto error_kmem_event_recorder;
dffef45d 4383 }
a67ba386
MD		 4384 event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0);
4385 if (!event_recorder_private_cache) {
4386 ret = -ENOMEM;
4387 goto error_kmem_event_recorder_private;
4388 }
4389 event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0);
dffef45d
FD		 4390 if (!event_notifier_cache) {
4391 ret = -ENOMEM;
4392 goto error_kmem_event_notifier;
20591cf7 4393 }
a67ba386
MD		 4394 event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0);
4395 if (!event_notifier_private_cache) {
4396 ret = -ENOMEM;
4397 goto error_kmem_event_notifier_private;
4398 }
80996790 4399 ret = lttng_abi_init();
02119ee5
MD		 4400 if (ret)
4401 goto error_abi;
0c956676
MD		 4402 ret = lttng_logger_init();
4403 if (ret)
4404 goto error_logger;
1e367326
MD		 4405 ret = lttng_init_cpu_hotplug();
4406 if (ret)
4407 goto error_hotplug;
101215b7 4408 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4409 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4410 __stringify(LTTNG_MODULES_MINOR_VERSION),
4411 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4412 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4413 LTTNG_VERSION_NAME,
4414#ifdef LTTNG_EXTRA_VERSION_GIT
4415 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4416#else
4417 "",
4418#endif
4419#ifdef LTTNG_EXTRA_VERSION_NAME
4420 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4421#else
4422 "");
4423#endif
c1551e57
MJ		 4424#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4425 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
4426#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 4427 return 0;
0c956676 4428
1e367326
MD		 4429error_hotplug:
4430 lttng_logger_exit();
0c956676
MD		 4431error_logger:
4432 lttng_abi_exit();
02119ee5 4433error_abi:
a67ba386
MD		 4434 kmem_cache_destroy(event_notifier_private_cache);
4435error_kmem_event_notifier_private:
dffef45d
FD		 4436 kmem_cache_destroy(event_notifier_cache);
4437error_kmem_event_notifier:
a67ba386
MD		 4438 kmem_cache_destroy(event_recorder_private_cache);
4439error_kmem_event_recorder_private:
4440 kmem_cache_destroy(event_recorder_cache);
4441error_kmem_event_recorder:
20591cf7 4442 lttng_tracepoint_exit();
07dfc1d0
MD		 4443error_tp:
4444 lttng_context_exit();
101215b7 4445 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4446 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4447 __stringify(LTTNG_MODULES_MINOR_VERSION),
4448 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4449 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4450 LTTNG_VERSION_NAME,
4451#ifdef LTTNG_EXTRA_VERSION_GIT
4452 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4453#else
4454 "",
4455#endif
4456#ifdef LTTNG_EXTRA_VERSION_NAME
4457 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4458#else
4459 "");
4460#endif
1c25284c 4461 return ret;
4e3c1b9b
MD		 4462}
4463
a90917c3 4464module_init(lttng_events_init);
11b5a3c2 4465
a90917c3 4466static void __exit lttng_events_exit(void)
4e3c1b9b 4467{
8cdc1a81 4468 struct lttng_kernel_session_private *session_priv, *tmpsession_priv;
92e94819 4469
1e367326 4470 lttng_exit_cpu_hotplug();
0c956676 4471 lttng_logger_exit();
80996790 4472 lttng_abi_exit();
8cdc1a81
MD		 4473 list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list)
4474 lttng_session_destroy(session_priv->pub);
a67ba386
MD		 4475 kmem_cache_destroy(event_recorder_cache);
4476 kmem_cache_destroy(event_recorder_private_cache);
dffef45d 4477 kmem_cache_destroy(event_notifier_cache);
a67ba386 4478 kmem_cache_destroy(event_notifier_private_cache);
20591cf7 4479 lttng_tracepoint_exit();
07dfc1d0 4480 lttng_context_exit();
101215b7 4481 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4482 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4483 __stringify(LTTNG_MODULES_MINOR_VERSION),
4484 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4485 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4486 LTTNG_VERSION_NAME,
4487#ifdef LTTNG_EXTRA_VERSION_GIT
4488 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4489#else
4490 "",
4491#endif
4492#ifdef LTTNG_EXTRA_VERSION_NAME
4493 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4494#else
4495 "");
4496#endif
4e3c1b9b 4497}
92e94819 4498
a90917c3 4499module_exit(lttng_events_exit);
11b5a3c2 4500
7ca11e77 4501#include <generated/patches.h>
101215b7
MJ		 4502#ifdef LTTNG_EXTRA_VERSION_GIT
4503MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4504#endif
4505#ifdef LTTNG_EXTRA_VERSION_NAME
4506MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4507#endif
92e94819
MD		 4508MODULE_LICENSE("GPL and additional rights");
4509MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4510MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4511MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4512 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4513 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4514 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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