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Add support for RHEL 9.1
[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
c570be0d 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
dd576484
MJ		 52#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0) \
53 || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0))
a029f2a3
MJ		 54#include <linux/stdarg.h>
55#else
56#include <stdarg.h>
57#endif
58
d83004aa
JD		 59#define METADATA_CACHE_DEFAULT_SIZE 4096
60
4e3c1b9b 61static LIST_HEAD(sessions);
750b05f2 62static LIST_HEAD(event_notifier_groups);
a90917c3 63static LIST_HEAD(lttng_transport_list);
a101fa10 64static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 65/*
66 * Protect the sessions and metadata caches.
67 */
4e3c1b9b 68static DEFINE_MUTEX(sessions_mutex);
a67ba386
MD		 69static struct kmem_cache *event_recorder_cache;
70static struct kmem_cache *event_recorder_private_cache;
dffef45d 71static struct kmem_cache *event_notifier_cache;
a67ba386 72static struct kmem_cache *event_notifier_private_cache;
4e3c1b9b 73
a40e3229
MD		 74static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session);
75static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session);
b2bc0bc8 76static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
dffef45d 77static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
b01155ba 78static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
3c997079 79
0648898e 80static void _lttng_event_destroy(struct lttng_kernel_event_common *event);
ac847066 81static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan);
38b35aff
MD		 82static void _lttng_event_unregister(struct lttng_kernel_event_recorder *event);
83static void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier);
c099397a 84static
a40e3229 85int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
ac847066 86 struct lttng_kernel_channel_buffer *chan,
a67ba386 87 struct lttng_kernel_event_recorder *event);
c099397a 88static
a40e3229 89int _lttng_session_metadata_statedump(struct lttng_kernel_session *session);
d83004aa
JD		 90static
91void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 92static
a40e3229 93int _lttng_type_statedump(struct lttng_kernel_session *session,
437d5aa5
MD		 94 const struct lttng_kernel_type_common *type,
95 enum lttng_kernel_string_encoding parent_encoding,
ceabb767
MD		 96 size_t nesting);
97static
a40e3229 98int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 99 const struct lttng_kernel_event_field *field,
f0039724 100 size_t nesting, const char **prev_field_name_p);
c099397a 101
c099397a 102void synchronize_trace(void)
abcca994 103{
57acf405
MJ		 104#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
105 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 106 synchronize_rcu();
107#else
abcca994 108 synchronize_sched();
92da05ce
MJ		 109#endif
110
5f4c791e 111#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 112#ifdef CONFIG_PREEMPT_RT_FULL
113 synchronize_rcu();
114#endif
5f4c791e 115#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 116#ifdef CONFIG_PREEMPT_RT
117 synchronize_rcu();
118#endif
5f4c791e 119#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 120}
121
3c997079
MD		 122void lttng_lock_sessions(void)
123{
124 mutex_lock(&sessions_mutex);
125}
126
127void lttng_unlock_sessions(void)
128{
129 mutex_unlock(&sessions_mutex);
130}
131
9fe593d2
FD		 132static struct lttng_transport *lttng_transport_find(const char *name)
133{
134 struct lttng_transport *transport;
135
136 list_for_each_entry(transport, &lttng_transport_list, node) {
137 if (!strcmp(transport->name, name))
138 return transport;
139 }
140 return NULL;
141}
142
3c997079
MD		 143/*
144 * Called with sessions lock held.
145 */
146int lttng_session_active(void)
147{
a40e3229 148 struct lttng_kernel_session_private *iter;
3c997079
MD		 149
150 list_for_each_entry(iter, &sessions, list) {
a40e3229 151 if (iter->pub->active)
3c997079
MD		 152 return 1;
153 }
154 return 0;
155}
156
a40e3229 157struct lttng_kernel_session *lttng_session_create(void)
4e3c1b9b 158{
a40e3229
MD		 159 struct lttng_kernel_session *session;
160 struct lttng_kernel_session_private *session_priv;
d83004aa 161 struct lttng_metadata_cache *metadata_cache;
3c997079 162 int i;
4e3c1b9b
MD		 163
164 mutex_lock(&sessions_mutex);
a40e3229 165 session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL);
4e3c1b9b 166 if (!session)
d83004aa 167 goto err;
a40e3229
MD		 168 session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL);
169 if (!session_priv)
170 goto err_free_session;
171 session->priv = session_priv;
172 session_priv->pub = session;
173
174 INIT_LIST_HEAD(&session_priv->chan);
175 INIT_LIST_HEAD(&session_priv->events);
176 lttng_guid_gen(&session_priv->uuid);
d83004aa
JD		 177
178 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
179 GFP_KERNEL);
180 if (!metadata_cache)
a40e3229 181 goto err_free_session_private;
0ca42eb7 182 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 183 if (!metadata_cache->data)
184 goto err_free_cache;
185 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
186 kref_init(&metadata_cache->refcount);
92d9f5e6 187 mutex_init(&metadata_cache->lock);
a40e3229 188 session_priv->metadata_cache = metadata_cache;
d83004aa 189 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
a40e3229 190 memcpy(&metadata_cache->uuid, &session_priv->uuid,
a36580d5 191 sizeof(metadata_cache->uuid));
a40e3229 192 INIT_LIST_HEAD(&session_priv->enablers_head);
3c997079 193 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
a40e3229
MD		 194 INIT_HLIST_HEAD(&session_priv->events_ht.table[i]);
195 list_add(&session_priv->list, &sessions);
196
a2fa977a
MD		 197 if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID))
198 goto tracker_alloc_error;
199 if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID))
200 goto tracker_alloc_error;
201 if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID))
202 goto tracker_alloc_error;
203 if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID))
204 goto tracker_alloc_error;
205 if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID))
206 goto tracker_alloc_error;
207 if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID))
208 goto tracker_alloc_error;
209
4e3c1b9b 210 mutex_unlock(&sessions_mutex);
a40e3229 211
4e3c1b9b 212 return session;
d83004aa 213
a2fa977a
MD		 214tracker_alloc_error:
215 lttng_id_tracker_fini(&session->pid_tracker);
216 lttng_id_tracker_fini(&session->vpid_tracker);
217 lttng_id_tracker_fini(&session->uid_tracker);
218 lttng_id_tracker_fini(&session->vuid_tracker);
219 lttng_id_tracker_fini(&session->gid_tracker);
220 lttng_id_tracker_fini(&session->vgid_tracker);
d83004aa
JD		 221err_free_cache:
222 kfree(metadata_cache);
a40e3229
MD		 223err_free_session_private:
224 lttng_kvfree(session_priv);
d83004aa 225err_free_session:
48f5e0b5 226 lttng_kvfree(session);
d83004aa
JD		 227err:
228 mutex_unlock(&sessions_mutex);
229 return NULL;
230}
231
99f52fcc
FD		 232static
233struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
234{
235 struct lttng_counter_transport *transport;
236
237 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
238 if (!strcmp(transport->name, name))
239 return transport;
240 }
241 return NULL;
242}
243
244struct lttng_counter *lttng_kernel_counter_create(
245 const char *counter_transport_name,
246 size_t number_dimensions, const size_t *dimensions_sizes)
247{
248 struct lttng_counter *counter = NULL;
249 struct lttng_counter_transport *counter_transport = NULL;
250
251 counter_transport = lttng_counter_transport_find(counter_transport_name);
252 if (!counter_transport) {
253 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
254 counter_transport_name);
255 goto notransport;
256 }
257 if (!try_module_get(counter_transport->owner)) {
258 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
259 goto notransport;
260 }
261
262 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
263 if (!counter)
264 goto nomem;
265
266 /* Create event notifier error counter. */
267 counter->ops = &counter_transport->ops;
268 counter->transport = counter_transport;
269
270 counter->counter = counter->ops->counter_create(
271 number_dimensions, dimensions_sizes, 0);
272 if (!counter->counter) {
273 goto create_error;
274 }
275
276 return counter;
277
278create_error:
279 lttng_kvfree(counter);
280nomem:
281 if (counter_transport)
282 module_put(counter_transport->owner);
283notransport:
284 return NULL;
285}
286
750b05f2
FD		 287struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
288{
289 struct lttng_transport *transport = NULL;
290 struct lttng_event_notifier_group *event_notifier_group;
291 const char *transport_name = "relay-event-notifier";
292 size_t subbuf_size = 4096; //TODO
293 size_t num_subbuf = 16; //TODO
294 unsigned int switch_timer_interval = 0;
295 unsigned int read_timer_interval = 0;
dffef45d 296 int i;
750b05f2
FD		 297
298 mutex_lock(&sessions_mutex);
299
300 transport = lttng_transport_find(transport_name);
301 if (!transport) {
302 printk(KERN_WARNING "LTTng: transport %s not found\n",
303 transport_name);
304 goto notransport;
305 }
306 if (!try_module_get(transport->owner)) {
307 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
308 transport_name);
309 goto notransport;
310 }
311
312 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
313 GFP_KERNEL);
314 if (!event_notifier_group)
315 goto nomem;
316
317 /*
318 * Initialize the ring buffer used to store event notifier
319 * notifications.
320 */
321 event_notifier_group->ops = &transport->ops;
da1fe18f 322 event_notifier_group->chan = transport->ops.priv->channel_create(
750b05f2
FD		 323 transport_name, event_notifier_group, NULL,
324 subbuf_size, num_subbuf, switch_timer_interval,
325 read_timer_interval);
326 if (!event_notifier_group->chan)
327 goto create_error;
328
329 event_notifier_group->transport = transport;
dffef45d
FD		 330
331 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
332 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
333 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
334 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
335
750b05f2
FD		 336 list_add(&event_notifier_group->node, &event_notifier_groups);
337
338 mutex_unlock(&sessions_mutex);
339
340 return event_notifier_group;
341
342create_error:
343 lttng_kvfree(event_notifier_group);
344nomem:
345 if (transport)
346 module_put(transport->owner);
347notransport:
348 mutex_unlock(&sessions_mutex);
349 return NULL;
350}
351
d83004aa
JD		 352void metadata_cache_destroy(struct kref *kref)
353{
354 struct lttng_metadata_cache *cache =
355 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 356 vfree(cache->data);
d83004aa 357 kfree(cache);
4e3c1b9b
MD		 358}
359
a40e3229 360void lttng_session_destroy(struct lttng_kernel_session *session)
4e3c1b9b 361{
ac847066 362 struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv;
a67ba386 363 struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
d83004aa 364 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 365 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 366 int ret;
4e3c1b9b
MD		 367
368 mutex_lock(&sessions_mutex);
a8f2d0c7 369 WRITE_ONCE(session->active, 0);
ac847066
MD		 370 list_for_each_entry(chan_priv, &session->priv->chan, node) {
371 ret = lttng_syscalls_unregister_channel(chan_priv->pub);
1ec65de1
MD		 372 WARN_ON(ret);
373 }
38b35aff
MD		 374 list_for_each_entry(event_recorder_priv, &session->priv->events, node)
375 _lttng_event_unregister(event_recorder_priv->pub);
abcca994 376 synchronize_trace(); /* Wait for in-flight events to complete */
ac847066
MD		 377 list_for_each_entry(chan_priv, &session->priv->chan, node) {
378 ret = lttng_syscalls_destroy_event(chan_priv->pub);
badfe9f5
MD		 379 WARN_ON(ret);
380 }
b2bc0bc8 381 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
a40e3229 382 &session->priv->enablers_head, node)
b2bc0bc8 383 lttng_event_enabler_destroy(event_enabler);
a40e3229 384 list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node)
0648898e 385 _lttng_event_destroy(&event_recorder_priv->pub->parent);
ac847066
MD		 386 list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) {
387 BUG_ON(chan_priv->channel_type == METADATA_CHANNEL);
388 _lttng_channel_destroy(chan_priv->pub);
d83004aa 389 }
a40e3229
MD		 390 mutex_lock(&session->priv->metadata_cache->lock);
391 list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list)
d83004aa 392 _lttng_metadata_channel_hangup(metadata_stream);
a40e3229 393 mutex_unlock(&session->priv->metadata_cache->lock);
a2fa977a
MD		 394 lttng_id_tracker_fini(&session->pid_tracker);
395 lttng_id_tracker_fini(&session->vpid_tracker);
396 lttng_id_tracker_fini(&session->uid_tracker);
397 lttng_id_tracker_fini(&session->vuid_tracker);
398 lttng_id_tracker_fini(&session->gid_tracker);
399 lttng_id_tracker_fini(&session->vgid_tracker);
a40e3229
MD		 400 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
401 list_del(&session->priv->list);
4e3c1b9b 402 mutex_unlock(&sessions_mutex);
a40e3229 403 lttng_kvfree(session->priv);
48f5e0b5 404 lttng_kvfree(session);
4e3c1b9b
MD		 405}
406
dffef45d
FD		 407void lttng_event_notifier_group_destroy(
408 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 409{
dffef45d 410 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
a67ba386 411 struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv;
dffef45d
FD		 412 int ret;
413
750b05f2
FD		 414 if (!event_notifier_group)
415 return;
416
417 mutex_lock(&sessions_mutex);
dffef45d 418
3b82c4e1 419 ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group);
8a8ac9a8
FD		 420 WARN_ON(ret);
421
a67ba386 422 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
38b35aff
MD		 423 &event_notifier_group->event_notifiers_head, node)
424 _lttng_event_notifier_unregister(event_notifier_priv->pub);
dffef45d 425
b01155ba
FD		 426 /* Wait for in-flight event notifier to complete */
427 synchronize_trace();
428
21f58fb7
FD		 429 irq_work_sync(&event_notifier_group->wakeup_pending);
430
8a8ac9a8
FD		 431 kfree(event_notifier_group->sc_filter);
432
dffef45d
FD		 433 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
434 &event_notifier_group->enablers_head, node)
435 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
436
a67ba386
MD		 437 list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv,
438 &event_notifier_group->event_notifiers_head, node)
0648898e 439 _lttng_event_destroy(&event_notifier_priv->pub->parent);
dffef45d 440
99f52fcc
FD		 441 if (event_notifier_group->error_counter) {
442 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 443
99f52fcc
FD		 444 error_counter->ops->counter_destroy(error_counter->counter);
445 module_put(error_counter->transport->owner);
446 lttng_kvfree(error_counter);
447 event_notifier_group->error_counter = NULL;
448 }
449
da1fe18f 450 event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan);
750b05f2
FD		 451 module_put(event_notifier_group->transport->owner);
452 list_del(&event_notifier_group->node);
dffef45d 453
750b05f2
FD		 454 mutex_unlock(&sessions_mutex);
455 lttng_kvfree(event_notifier_group);
456}
457
a40e3229 458int lttng_session_statedump(struct lttng_kernel_session *session)
601252cf
MD		 459{
460 int ret;
461
462 mutex_lock(&sessions_mutex);
463 ret = lttng_statedump_start(session);
464 mutex_unlock(&sessions_mutex);
465 return ret;
466}
467
a40e3229 468int lttng_session_enable(struct lttng_kernel_session *session)
c0e31d2e
MD		 469{
470 int ret = 0;
ac847066 471 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 472
473 mutex_lock(&sessions_mutex);
474 if (session->active) {
475 ret = -EBUSY;
476 goto end;
477 }
c099397a 478
3c997079 479 /* Set transient enabler state to "enabled" */
a40e3229 480 session->priv->tstate = 1;
3c997079 481
4ef81e4a 482 /* We need to sync enablers with session before activation. */
b2bc0bc8 483 lttng_session_sync_event_enablers(session);
4ef81e4a 484
c099397a
MD		 485 /*
486 * Snapshot the number of events per channel to know the type of header
487 * we need to use.
488 */
ac847066
MD		 489 list_for_each_entry(chan_priv, &session->priv->chan, node) {
490 if (chan_priv->header_type)
491 continue; /* don't change it if session stop/restart */
492 if (chan_priv->free_event_id < 31)
493 chan_priv->header_type = 1; /* compact */
c099397a 494 else
ac847066 495 chan_priv->header_type = 2; /* large */
c099397a
MD		 496 }
497
64af2437 498 /* Clear each stream's quiescent state. */
ac847066
MD		 499 list_for_each_entry(chan_priv, &session->priv->chan, node) {
500 if (chan_priv->channel_type != METADATA_CHANNEL)
501 lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan);
09b93db9 502 }
64af2437 503
a8f2d0c7 504 WRITE_ONCE(session->active, 1);
a40e3229 505 WRITE_ONCE(session->priv->been_active, 1);
a90917c3 506 ret = _lttng_session_metadata_statedump(session);
c337ddc2 507 if (ret) {
a8f2d0c7 508 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 509 goto end;
510 }
511 ret = lttng_statedump_start(session);
360f38ea 512 if (ret)
a8f2d0c7 513 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 514end:
515 mutex_unlock(&sessions_mutex);
11b5a3c2 516 return ret;
c0e31d2e
MD		 517}
518
a40e3229 519int lttng_session_disable(struct lttng_kernel_session *session)
c0e31d2e
MD		 520{
521 int ret = 0;
ac847066 522 struct lttng_kernel_channel_buffer_private *chan_priv;
c0e31d2e
MD		 523
524 mutex_lock(&sessions_mutex);
525 if (!session->active) {
526 ret = -EBUSY;
527 goto end;
528 }
a8f2d0c7 529 WRITE_ONCE(session->active, 0);
3c997079
MD		 530
531 /* Set transient enabler state to "disabled" */
a40e3229 532 session->priv->tstate = 0;
b2bc0bc8 533 lttng_session_sync_event_enablers(session);
64af2437
MD		 534
535 /* Set each stream's quiescent state. */
ac847066
MD		 536 list_for_each_entry(chan_priv, &session->priv->chan, node) {
537 if (chan_priv->channel_type != METADATA_CHANNEL)
538 lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan);
09b93db9 539 }
c0e31d2e
MD		 540end:
541 mutex_unlock(&sessions_mutex);
11b5a3c2 542 return ret;
c0e31d2e
MD		 543}
544
a40e3229 545int lttng_session_metadata_regenerate(struct lttng_kernel_session *session)
9616f0bf
JD		 546{
547 int ret = 0;
ac847066 548 struct lttng_kernel_channel_buffer_private *chan_priv;
a67ba386 549 struct lttng_kernel_event_recorder_private *event_recorder_priv;
a40e3229 550 struct lttng_metadata_cache *cache = session->priv->metadata_cache;
9616f0bf
JD		 551 struct lttng_metadata_stream *stream;
552
553 mutex_lock(&sessions_mutex);
554 if (!session->active) {
555 ret = -EBUSY;
556 goto end;
557 }
558
559 mutex_lock(&cache->lock);
560 memset(cache->data, 0, cache->cache_alloc);
561 cache->metadata_written = 0;
562 cache->version++;
a40e3229 563 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) {
9616f0bf
JD		 564 stream->metadata_out = 0;
565 stream->metadata_in = 0;
566 }
567 mutex_unlock(&cache->lock);
568
a40e3229 569 session->priv->metadata_dumped = 0;
ac847066
MD		 570 list_for_each_entry(chan_priv, &session->priv->chan, node) {
571 chan_priv->metadata_dumped = 0;
9616f0bf
JD		 572 }
573
a40e3229 574 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 575 event_recorder_priv->metadata_dumped = 0;
9616f0bf
JD		 576 }
577
578 ret = _lttng_session_metadata_statedump(session);
579
580end:
581 mutex_unlock(&sessions_mutex);
582 return ret;
583}
584
ac847066 585int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel)
e64957da 586{
3c997079 587 int ret = 0;
e64957da 588
3c997079 589 mutex_lock(&sessions_mutex);
ac847066 590 if (channel->priv->channel_type == METADATA_CHANNEL) {
3c997079
MD		 591 ret = -EPERM;
592 goto end;
593 }
ac847066 594 if (channel->parent.enabled) {
3c997079
MD		 595 ret = -EEXIST;
596 goto end;
597 }
598 /* Set transient enabler state to "enabled" */
ac847066
MD		 599 channel->priv->parent.tstate = 1;
600 lttng_session_sync_event_enablers(channel->parent.session);
3c997079 601 /* Set atomically the state to "enabled" */
ac847066 602 WRITE_ONCE(channel->parent.enabled, 1);
3c997079
MD		 603end:
604 mutex_unlock(&sessions_mutex);
605 return ret;
e64957da
MD		 606}
607
ac847066 608int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel)
e64957da 609{
3c997079 610 int ret = 0;
e64957da 611
3c997079 612 mutex_lock(&sessions_mutex);
ac847066 613 if (channel->priv->channel_type == METADATA_CHANNEL) {
3c997079
MD		 614 ret = -EPERM;
615 goto end;
616 }
ac847066 617 if (!channel->parent.enabled) {
3c997079
MD		 618 ret = -EEXIST;
619 goto end;
620 }
621 /* Set atomically the state to "disabled" */
ac847066 622 WRITE_ONCE(channel->parent.enabled, 0);
3c997079 623 /* Set transient enabler state to "enabled" */
ac847066
MD		 624 channel->priv->parent.tstate = 0;
625 lttng_session_sync_event_enablers(channel->parent.session);
3c997079
MD		 626end:
627 mutex_unlock(&sessions_mutex);
628 return ret;
e64957da
MD		 629}
630
9d993668 631int lttng_event_enable(struct lttng_kernel_event_common *event)
e64957da 632{
3c997079 633 int ret = 0;
e64957da 634
3c997079 635 mutex_lock(&sessions_mutex);
9d993668
MD		 636 switch (event->type) {
637 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
638 {
639 struct lttng_kernel_event_recorder *event_recorder =
640 container_of(event, struct lttng_kernel_event_recorder, parent);
641
ac847066 642 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 643 ret = -EPERM;
644 goto end;
645 }
a0493bef 646 break;
9d993668
MD		 647 }
648 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
649 switch (event->priv->instrumentation) {
650 case LTTNG_KERNEL_ABI_KRETPROBE:
651 ret = -EINVAL;
652 goto end;
653 default:
654 break;
655 }
a0493bef
MD		 656 break;
657 default:
9d993668 658 break;
a0493bef 659 }
e64957da 660
9d993668 661 if (event->enabled) {
3c997079
MD		 662 ret = -EEXIST;
663 goto end;
664 }
a67ba386 665 switch (event->priv->instrumentation) {
c570be0d
MJ		 666 case LTTNG_KERNEL_ABI_TRACEPOINT:
667 lttng_fallthrough;
606828e4 668 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 669 ret = -EINVAL;
670 break;
b4a75708 671
c570be0d
MJ		 672 case LTTNG_KERNEL_ABI_KPROBE:
673 lttng_fallthrough;
606828e4 674 case LTTNG_KERNEL_ABI_UPROBE:
9d993668 675 WRITE_ONCE(event->enabled, 1);
a0493bef 676 break;
b4a75708 677
606828e4 678 case LTTNG_KERNEL_ABI_KRETPROBE:
9d993668 679 ret = lttng_kretprobes_event_enable_state(event, 1);
a0493bef 680 break;
b4a75708 681
c570be0d
MJ		 682 case LTTNG_KERNEL_ABI_FUNCTION:
683 lttng_fallthrough;
684 case LTTNG_KERNEL_ABI_NOOP:
685 lttng_fallthrough;
a0493bef
MD		 686 default:
687 WARN_ON_ONCE(1);
688 ret = -EINVAL;
689 }
3c997079
MD		 690end:
691 mutex_unlock(&sessions_mutex);
692 return ret;
e64957da
MD		 693}
694
9d993668 695int lttng_event_disable(struct lttng_kernel_event_common *event)
dffef45d
FD		 696{
697 int ret = 0;
698
699 mutex_lock(&sessions_mutex);
9d993668
MD		 700 switch (event->type) {
701 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
702 {
703 struct lttng_kernel_event_recorder *event_recorder =
704 container_of(event, struct lttng_kernel_event_recorder, parent);
705
ac847066 706 if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) {
9d993668
MD		 707 ret = -EPERM;
708 goto end;
709 }
b01155ba 710 break;
9d993668
MD		 711 }
712 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
713 switch (event->priv->instrumentation) {
714 case LTTNG_KERNEL_ABI_KRETPROBE:
715 ret = -EINVAL;
716 goto end;
717 default:
718 break;
719 }
2b16f0c9 720 break;
dffef45d 721 default:
9d993668 722 break;
dffef45d 723 }
dffef45d 724
a67ba386 725 if (!event->enabled) {
dffef45d
FD		 726 ret = -EEXIST;
727 goto end;
728 }
a67ba386 729 switch (event->priv->instrumentation) {
c570be0d
MJ		 730 case LTTNG_KERNEL_ABI_TRACEPOINT:
731 lttng_fallthrough;
606828e4 732 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 733 ret = -EINVAL;
734 break;
b4a75708 735
c570be0d
MJ		 736 case LTTNG_KERNEL_ABI_KPROBE:
737 lttng_fallthrough;
606828e4 738 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 739 WRITE_ONCE(event->enabled, 0);
2b16f0c9 740 break;
b4a75708 741
9d993668
MD		 742 case LTTNG_KERNEL_ABI_KRETPROBE:
743 ret = lttng_kretprobes_event_enable_state(event, 0);
744 break;
745
c570be0d
MJ		 746 case LTTNG_KERNEL_ABI_FUNCTION:
747 lttng_fallthrough;
748 case LTTNG_KERNEL_ABI_NOOP:
749 lttng_fallthrough;
dffef45d
FD		 750 default:
751 WARN_ON_ONCE(1);
752 ret = -EINVAL;
753 }
754end:
755 mutex_unlock(&sessions_mutex);
756 return ret;
757}
758
ac847066 759struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session,
5dbbdb43
MD		 760 const char *transport_name,
761 void *buf_addr,
4e3c1b9b
MD		 762 size_t subbuf_size, size_t num_subbuf,
763 unsigned int switch_timer_interval,
d83004aa
JD		 764 unsigned int read_timer_interval,
765 enum channel_type channel_type)
4e3c1b9b 766{
ac847066
MD		 767 struct lttng_kernel_channel_buffer *chan;
768 struct lttng_kernel_channel_buffer_private *chan_priv;
a90917c3 769 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 770
771 mutex_lock(&sessions_mutex);
a40e3229 772 if (session->priv->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 773 goto active; /* Refuse to add channel to active session */
a90917c3 774 transport = lttng_transport_find(transport_name);
f3d01b96 775 if (!transport) {
5a15f70c 776 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 777 transport_name);
c0e31d2e 778 goto notransport;
f3d01b96 779 }
a33c9927 780 if (!try_module_get(transport->owner)) {
5a15f70c 781 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 782 goto notransport;
783 }
ac847066 784 chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL);
4e3c1b9b 785 if (!chan)
c0e31d2e 786 goto nomem;
ac847066
MD		 787 chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL);
788 if (!chan_priv)
789 goto nomem_priv;
790 chan->priv = chan_priv;
791 chan_priv->pub = chan;
792 chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER;
793 chan->parent.session = session;
794 chan->priv->id = session->priv->free_chan_id++;
3b731ab1 795 chan->ops = &transport->ops;
125b4df4
MD		 796 /*
797 * Note: the channel creation op already writes into the packet
798 * headers. Therefore the "chan" information used as input
799 * should be already accessible.
800 */
ac847066 801 chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name,
5f5ddf01
MD		 802 chan, buf_addr, subbuf_size, num_subbuf,
803 switch_timer_interval, read_timer_interval);
ac847066 804 if (!chan->priv->rb_chan)
f3d01b96 805 goto create_error;
ac847066
MD		 806 chan->priv->parent.tstate = 1;
807 chan->parent.enabled = 1;
808 chan->priv->transport = transport;
809 chan->priv->channel_type = channel_type;
810 list_add(&chan->priv->node, &session->priv->chan);
4e3c1b9b
MD		 811 mutex_unlock(&sessions_mutex);
812 return chan;
813
f3d01b96 814create_error:
ac847066
MD		 815 kfree(chan_priv);
816nomem_priv:
f3d01b96 817 kfree(chan);
c0e31d2e 818nomem:
a33c9927
MD		 819 if (transport)
820 module_put(transport->owner);
c0e31d2e 821notransport:
e5382b6d 822active:
4e3c1b9b
MD		 823 mutex_unlock(&sessions_mutex);
824 return NULL;
825}
826
827/*
d83004aa
JD		 828 * Only used internally at session destruction for per-cpu channels, and
829 * when metadata channel is released.
830 * Needs to be called with sessions mutex held.
4e3c1b9b 831 */
aa7c23a9 832static
ac847066 833void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan)
4e3c1b9b 834{
ac847066
MD		 835 chan->ops->priv->channel_destroy(chan->priv->rb_chan);
836 module_put(chan->priv->transport->owner);
837 list_del(&chan->priv->node);
838 lttng_kernel_destroy_context(chan->priv->ctx);
839 kfree(chan->priv);
4e3c1b9b
MD		 840 kfree(chan);
841}
842
ac847066 843void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan)
d83004aa 844{
ac847066 845 BUG_ON(chan->priv->channel_type != METADATA_CHANNEL);
d83004aa
JD		 846
847 /* Protect the metadata cache with the sessions_mutex. */
848 mutex_lock(&sessions_mutex);
849 _lttng_channel_destroy(chan);
850 mutex_unlock(&sessions_mutex);
851}
852EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
853
854static
855void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
856{
857 stream->finalized = 1;
858 wake_up_interruptible(&stream->read_wait);
859}
860
a101fa10 861
e5382b6d
MD		 862/*
863 * Supports event creation while tracing session is active.
3c997079 864 * Needs to be called with sessions mutex held.
e5382b6d 865 */
ac847066 866struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan,
606828e4 867 struct lttng_kernel_abi_event *event_param,
437d5aa5 868 const struct lttng_kernel_event_desc *event_desc,
606828e4 869 enum lttng_kernel_abi_instrumentation itype)
4e3c1b9b 870{
ac847066 871 struct lttng_kernel_session *session = chan->parent.session;
a67ba386
MD		 872 struct lttng_kernel_event_recorder *event_recorder;
873 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079
MD		 874 const char *event_name;
875 struct hlist_head *head;
3d084699 876 int ret;
4e3c1b9b 877
ac847066 878 if (chan->priv->free_event_id == -1U) {
4cf0bf51 879 ret = -EMFILE;
e5382b6d 880 goto full;
abc0446a 881 }
3c997079
MD		 882
883 switch (itype) {
606828e4 884 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 885 event_name = event_desc->event_name;
3c997079 886 break;
b4a75708 887
c570be0d
MJ		 888 case LTTNG_KERNEL_ABI_KPROBE:
889 lttng_fallthrough;
890 case LTTNG_KERNEL_ABI_UPROBE:
891 lttng_fallthrough;
892 case LTTNG_KERNEL_ABI_KRETPROBE:
893 lttng_fallthrough;
606828e4 894 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 895 event_name = event_param->name;
896 break;
b4a75708 897
c570be0d
MJ		 898 case LTTNG_KERNEL_ABI_FUNCTION:
899 lttng_fallthrough;
900 case LTTNG_KERNEL_ABI_NOOP:
901 lttng_fallthrough;
3c997079
MD		 902 default:
903 WARN_ON_ONCE(1);
904 ret = -EINVAL;
905 goto type_error;
906 }
4a11ef1c 907
a40e3229 908 head = utils_borrow_hash_table_bucket(session->priv->events_ht.table,
4a11ef1c 909 LTTNG_EVENT_HT_SIZE, event_name);
a67ba386
MD		 910 lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
911 WARN_ON_ONCE(!event_recorder_priv->parent.desc);
912 if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name,
606828e4 913 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386 914 && chan == event_recorder_priv->pub->chan) {
3c997079
MD		 915 ret = -EEXIST;
916 goto exist;
abc0446a
MD		 917 }
918 }
3c997079 919
a67ba386
MD		 920 event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
921 if (!event_recorder) {
4cf0bf51 922 ret = -ENOMEM;
4e3c1b9b 923 goto cache_error;
abc0446a 924 }
a67ba386
MD		 925 event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
926 if (!event_recorder_priv) {
927 ret = -ENOMEM;
928 goto cache_private_error;
929 }
930 event_recorder_priv->pub = event_recorder;
931 event_recorder_priv->parent.pub = &event_recorder->parent;
932 event_recorder->priv = event_recorder_priv;
933 event_recorder->parent.priv = &event_recorder_priv->parent;
934 event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
935
8a445457 936 event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 937 event_recorder->chan = chan;
ac847066 938 event_recorder->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 939 event_recorder->priv->parent.instrumentation = itype;
940 INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head);
941 INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head);
3c997079
MD		 942
943 switch (itype) {
606828e4 944 case LTTNG_KERNEL_ABI_TRACEPOINT:
3c997079 945 /* Event will be enabled by enabler sync. */
a67ba386
MD		 946 event_recorder->parent.enabled = 0;
947 event_recorder->priv->parent.registered = 0;
948 event_recorder->priv->parent.desc = lttng_event_desc_get(event_name);
949 if (!event_recorder->priv->parent.desc) {
4cf0bf51 950 ret = -ENOENT;
d3dbe23c 951 goto register_error;
abc0446a 952 }
3c997079
MD		 953 /* Populate lttng_event structure before event registration. */
954 smp_wmb();
baf20995 955 break;
b4a75708 956
606828e4 957 case LTTNG_KERNEL_ABI_KPROBE:
a0493bef
MD		 958 /*
959 * Needs to be explicitly enabled after creation, since
960 * we may want to apply filters.
961 */
a67ba386
MD		 962 event_recorder->parent.enabled = 0;
963 event_recorder->priv->parent.registered = 1;
3c997079
MD		 964 /*
965 * Populate lttng_event structure before event
966 * registration.
967 */
968 smp_wmb();
8bf17deb 969 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 970 event_param->u.kprobe.symbol_name,
971 event_param->u.kprobe.offset,
972 event_param->u.kprobe.addr,
a67ba386 973 event_recorder);
abc0446a 974 if (ret) {
4cf0bf51 975 ret = -EINVAL;
d6d808f3 976 goto register_error;
abc0446a 977 }
a67ba386 978 ret = try_module_get(event_recorder->priv->parent.desc->owner);
edeb3137 979 WARN_ON_ONCE(!ret);
d6d808f3 980 break;
b4a75708 981
606828e4 982 case LTTNG_KERNEL_ABI_KRETPROBE:
7371f44c 983 {
a67ba386
MD		 984 struct lttng_kernel_event_recorder *event_recorder_return;
985 struct lttng_kernel_event_recorder_private *event_recorder_return_priv;
7371f44c
MD		 986
987 /* kretprobe defines 2 events */
a0493bef
MD		 988 /*
989 * Needs to be explicitly enabled after creation, since
990 * we may want to apply filters.
991 */
a67ba386
MD		 992 event_recorder->parent.enabled = 0;
993 event_recorder->priv->parent.registered = 1;
994
995 event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL);
996 if (!event_recorder_return) {
997 ret = -ENOMEM;
998 goto register_error;
999 }
1000 event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL);
1001 if (!event_recorder_return_priv) {
1002 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1003 ret = -ENOMEM;
7371f44c 1004 goto register_error;
abc0446a 1005 }
a67ba386
MD		 1006 event_recorder_return_priv->pub = event_recorder_return;
1007 event_recorder_return_priv->parent.pub = &event_recorder_return->parent;
1008 event_recorder_return->priv = event_recorder_return_priv;
1009 event_recorder_return->parent.priv = &event_recorder_return_priv->parent;
1010 event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER;
1011
8a445457 1012 event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter;
a67ba386 1013 event_recorder_return->chan = chan;
ac847066 1014 event_recorder_return->priv->id = chan->priv->free_event_id++;
a67ba386
MD		 1015 event_recorder_return->priv->parent.instrumentation = itype;
1016 event_recorder_return->parent.enabled = 0;
1017 event_recorder_return->priv->parent.registered = 1;
1018 INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head);
1019 INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head);
7371f44c 1020 /*
a90917c3 1021 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 1022 */
1023 smp_wmb();
3c997079 1024 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 1025 event_param->u.kretprobe.symbol_name,
1026 event_param->u.kretprobe.offset,
1027 event_param->u.kretprobe.addr,
a67ba386 1028 event_recorder, event_recorder_return);
7371f44c 1029 if (ret) {
a67ba386
MD		 1030 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1031 kmem_cache_free(event_recorder_cache, event_recorder_return);
4cf0bf51 1032 ret = -EINVAL;
7371f44c
MD		 1033 goto register_error;
1034 }
1035 /* Take 2 refs on the module: one per event. */
a67ba386 1036 ret = try_module_get(event_recorder->priv->parent.desc->owner);
7371f44c 1037 WARN_ON_ONCE(!ret);
a67ba386 1038 ret = try_module_get(event_recorder_return->priv->parent.desc->owner);
7371f44c 1039 WARN_ON_ONCE(!ret);
ac847066 1040 ret = _lttng_event_metadata_statedump(chan->parent.session, chan,
a67ba386 1041 event_recorder_return);
abc0446a 1042 WARN_ON_ONCE(ret > 0);
7371f44c 1043 if (ret) {
a67ba386
MD		 1044 kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv);
1045 kmem_cache_free(event_recorder_cache, event_recorder_return);
1046 module_put(event_recorder_return->priv->parent.desc->owner);
1047 module_put(event_recorder->priv->parent.desc->owner);
7371f44c
MD		 1048 goto statedump_error;
1049 }
ac847066 1050 list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events);
7371f44c
MD		 1051 break;
1052 }
b4a75708 1053
606828e4 1054 case LTTNG_KERNEL_ABI_SYSCALL:
a0493bef
MD		 1055 /*
1056 * Needs to be explicitly enabled after creation, since
1057 * we may want to apply filters.
1058 */
a67ba386
MD		 1059 event_recorder->parent.enabled = 0;
1060 event_recorder->priv->parent.registered = 0;
1061 event_recorder->priv->parent.desc = event_desc;
badfe9f5 1062 switch (event_param->u.syscall.entryexit) {
606828e4 1063 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1064 ret = -EINVAL;
1065 goto register_error;
606828e4 1066 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1067 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
badfe9f5 1068 break;
606828e4 1069 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1070 event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
badfe9f5
MD		 1071 break;
1072 }
1073 switch (event_param->u.syscall.abi) {
606828e4 1074 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1075 ret = -EINVAL;
1076 goto register_error;
606828e4 1077 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1078 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
badfe9f5 1079 break;
606828e4 1080 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1081 event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
badfe9f5
MD		 1082 break;
1083 }
a67ba386 1084 if (!event_recorder->priv->parent.desc) {
4cf0bf51 1085 ret = -EINVAL;
259b6cb3 1086 goto register_error;
abc0446a 1087 }
1ec65de1 1088 break;
b4a75708 1089
606828e4 1090 case LTTNG_KERNEL_ABI_UPROBE:
a344f64b
FD		 1091 /*
1092 * Needs to be explicitly enabled after creation, since
1093 * we may want to apply filters.
1094 */
a67ba386
MD		 1095 event_recorder->parent.enabled = 0;
1096 event_recorder->priv->parent.registered = 1;
3aed4dca 1097
a344f64b
FD		 1098 /*
1099 * Populate lttng_event structure before event
1100 * registration.
1101 */
1102 smp_wmb();
149b9a9d 1103
83b802dc 1104 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1105 event_param->u.uprobe.fd,
a67ba386 1106 event_recorder);
149b9a9d
YB		 1107 if (ret)
1108 goto register_error;
a67ba386 1109 ret = try_module_get(event_recorder->priv->parent.desc->owner);
149b9a9d
YB		 1110 WARN_ON_ONCE(!ret);
1111 break;
b4a75708 1112
c570be0d
MJ		 1113 case LTTNG_KERNEL_ABI_FUNCTION:
1114 lttng_fallthrough;
1115 case LTTNG_KERNEL_ABI_NOOP:
1116 lttng_fallthrough;
baf20995
MD		 1117 default:
1118 WARN_ON_ONCE(1);
4cf0bf51 1119 ret = -EINVAL;
df07930b 1120 goto register_error;
baf20995 1121 }
ac847066 1122 ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder);
abc0446a
MD		 1123 WARN_ON_ONCE(ret > 0);
1124 if (ret) {
c099397a 1125 goto statedump_error;
abc0446a 1126 }
a67ba386 1127 hlist_add_head(&event_recorder->priv->hlist, head);
ac847066 1128 list_add(&event_recorder->priv->node, &chan->parent.session->priv->events);
a67ba386 1129 return event_recorder;
4e3c1b9b 1130
c099397a 1131statedump_error:
259b6cb3 1132 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1133register_error:
a67ba386
MD		 1134 kmem_cache_free(event_recorder_private_cache, event_recorder_priv);
1135cache_private_error:
1136 kmem_cache_free(event_recorder_cache, event_recorder);
4e3c1b9b
MD		 1137cache_error:
1138exist:
3c997079 1139type_error:
e5382b6d 1140full:
4cf0bf51 1141 return ERR_PTR(ret);
4e3c1b9b
MD		 1142}
1143
a67ba386 1144struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
437d5aa5 1145 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1146 uint64_t token, uint64_t error_counter_index,
1147 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1148 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1149 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1150{
a67ba386
MD		 1151 struct lttng_kernel_event_notifier *event_notifier;
1152 struct lttng_kernel_event_notifier_private *event_notifier_priv;
ab04d7b1 1153 struct lttng_counter *error_counter;
dffef45d
FD		 1154 const char *event_name;
1155 struct hlist_head *head;
1156 int ret;
1157
1158 switch (itype) {
606828e4 1159 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1160 event_name = event_desc->event_name;
b01155ba 1161 break;
b4a75708 1162
c570be0d
MJ		 1163 case LTTNG_KERNEL_ABI_KPROBE:
1164 lttng_fallthrough;
1165 case LTTNG_KERNEL_ABI_UPROBE:
1166 lttng_fallthrough;
606828e4 1167 case LTTNG_KERNEL_ABI_SYSCALL:
2b16f0c9
FD		 1168 event_name = event_notifier_param->event.name;
1169 break;
b4a75708 1170
c570be0d
MJ		 1171 case LTTNG_KERNEL_ABI_KRETPROBE:
1172 lttng_fallthrough;
1173 case LTTNG_KERNEL_ABI_FUNCTION:
1174 lttng_fallthrough;
1175 case LTTNG_KERNEL_ABI_NOOP:
1176 lttng_fallthrough;
dffef45d
FD		 1177 default:
1178 WARN_ON_ONCE(1);
1179 ret = -EINVAL;
1180 goto type_error;
1181 }
1182
1183 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1184 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
a67ba386
MD		 1185 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
1186 WARN_ON_ONCE(!event_notifier_priv->parent.desc);
1187 if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name,
606828e4 1188 LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
a67ba386
MD		 1189 && event_notifier_group == event_notifier_priv->group
1190 && token == event_notifier_priv->parent.user_token) {
dffef45d
FD		 1191 ret = -EEXIST;
1192 goto exist;
1193 }
1194 }
1195
1196 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1197 if (!event_notifier) {
1198 ret = -ENOMEM;
1199 goto cache_error;
1200 }
a67ba386
MD		 1201 event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL);
1202 if (!event_notifier_priv) {
1203 ret = -ENOMEM;
1204 goto cache_private_error;
1205 }
1206 event_notifier_priv->pub = event_notifier;
1207 event_notifier_priv->parent.pub = &event_notifier->parent;
1208 event_notifier->priv = event_notifier_priv;
1209 event_notifier->parent.priv = &event_notifier_priv->parent;
1210 event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER;
1211
1212 event_notifier->priv->group = event_notifier_group;
1213 event_notifier->priv->parent.user_token = token;
1214 event_notifier->priv->error_counter_index = error_counter_index;
1215 event_notifier->priv->num_captures = 0;
1216 event_notifier->priv->parent.instrumentation = itype;
1217 event_notifier->notification_send = lttng_event_notifier_notification_send;
1218 INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head);
1219 INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head);
1220 INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
8a445457 1221 event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter;
dffef45d
FD		 1222
1223 switch (itype) {
606828e4 1224 case LTTNG_KERNEL_ABI_TRACEPOINT:
dffef45d 1225 /* Event will be enabled by enabler sync. */
a67ba386
MD		 1226 event_notifier->parent.enabled = 0;
1227 event_notifier->priv->parent.registered = 0;
1228 event_notifier->priv->parent.desc = lttng_event_desc_get(event_name);
1229 if (!event_notifier->priv->parent.desc) {
dffef45d
FD		 1230 ret = -ENOENT;
1231 goto register_error;
1232 }
1233 /* Populate lttng_event_notifier structure before event registration. */
1234 smp_wmb();
1235 break;
b4a75708 1236
606828e4 1237 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1238 /*
1239 * Needs to be explicitly enabled after creation, since
1240 * we may want to apply filters.
1241 */
a67ba386
MD		 1242 event_notifier->parent.enabled = 0;
1243 event_notifier->priv->parent.registered = 1;
2b16f0c9
FD		 1244 /*
1245 * Populate lttng_event_notifier structure before event
1246 * registration.
1247 */
1248 smp_wmb();
1249 ret = lttng_kprobes_register_event_notifier(
1250 event_notifier_param->event.u.kprobe.symbol_name,
1251 event_notifier_param->event.u.kprobe.offset,
1252 event_notifier_param->event.u.kprobe.addr,
1253 event_notifier);
1254 if (ret) {
1255 ret = -EINVAL;
1256 goto register_error;
1257 }
a67ba386 1258 ret = try_module_get(event_notifier->priv->parent.desc->owner);
2b16f0c9
FD		 1259 WARN_ON_ONCE(!ret);
1260 break;
b4a75708 1261
606828e4 1262 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1263 /*
1264 * Needs to be explicitly enabled after creation, since
1265 * we may want to apply filters.
1266 */
a67ba386
MD		 1267 event_notifier->parent.enabled = 0;
1268 event_notifier->priv->parent.registered = 0;
1269 event_notifier->priv->parent.desc = event_desc;
8a8ac9a8 1270 switch (event_notifier_param->event.u.syscall.entryexit) {
606828e4 1271 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
8a8ac9a8
FD		 1272 ret = -EINVAL;
1273 goto register_error;
606828e4 1274 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
a67ba386 1275 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
8a8ac9a8 1276 break;
606828e4 1277 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
a67ba386 1278 event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
8a8ac9a8
FD		 1279 break;
1280 }
1281 switch (event_notifier_param->event.u.syscall.abi) {
606828e4 1282 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
8a8ac9a8
FD		 1283 ret = -EINVAL;
1284 goto register_error;
606828e4 1285 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
a67ba386 1286 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
8a8ac9a8 1287 break;
606828e4 1288 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
a67ba386 1289 event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
8a8ac9a8
FD		 1290 break;
1291 }
1292
a67ba386 1293 if (!event_notifier->priv->parent.desc) {
8a8ac9a8
FD		 1294 ret = -EINVAL;
1295 goto register_error;
1296 }
1297 break;
b4a75708 1298
606828e4 1299 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1300 /*
1301 * Needs to be explicitly enabled after creation, since
1302 * we may want to apply filters.
1303 */
a67ba386
MD		 1304 event_notifier->parent.enabled = 0;
1305 event_notifier->priv->parent.registered = 1;
9de67196
FD		 1306
1307 /*
1308 * Populate lttng_event_notifier structure before
1309 * event_notifier registration.
1310 */
1311 smp_wmb();
1312
1313 ret = lttng_uprobes_register_event_notifier(
1314 event_notifier_param->event.name,
1315 event_notifier_param->event.u.uprobe.fd,
1316 event_notifier);
1317 if (ret)
1318 goto register_error;
a67ba386 1319 ret = try_module_get(event_notifier->priv->parent.desc->owner);
9de67196
FD		 1320 WARN_ON_ONCE(!ret);
1321 break;
b4a75708 1322
c570be0d
MJ		 1323 case LTTNG_KERNEL_ABI_KRETPROBE:
1324 lttng_fallthrough;
1325 case LTTNG_KERNEL_ABI_FUNCTION:
1326 lttng_fallthrough;
1327 case LTTNG_KERNEL_ABI_NOOP:
1328 lttng_fallthrough;
dffef45d
FD		 1329 default:
1330 WARN_ON_ONCE(1);
1331 ret = -EINVAL;
1332 goto register_error;
1333 }
1334
a67ba386
MD		 1335 list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head);
1336 hlist_add_head(&event_notifier->priv->hlist, head);
99f52fcc
FD		 1337
1338 /*
1339 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1340 * bucket is currently in use. We trust it. The session lock
1341 * synchronizes against concurrent creation of the error
1342 * counter.
99f52fcc 1343 */
ab04d7b1
MD		 1344 error_counter = event_notifier_group->error_counter;
1345 if (error_counter) {
99f52fcc
FD		 1346 size_t dimension_index[1];
1347
1348 /*
1349 * Check that the index is within the boundary of the counter.
1350 */
a67ba386 1351 if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) {
99f52fcc 1352 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
a67ba386 1353 event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index);
99f52fcc
FD		 1354 ret = -EINVAL;
1355 goto register_error;
1356 }
1357
a67ba386 1358 dimension_index[0] = event_notifier->priv->error_counter_index;
ab04d7b1 1359 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1360 if (ret) {
1361 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
a67ba386 1362 event_notifier->priv->error_counter_index);
99f52fcc
FD		 1363 goto register_error;
1364 }
1365 }
1366
dffef45d
FD		 1367 return event_notifier;
1368
1369register_error:
a67ba386
MD		 1370 kmem_cache_free(event_notifier_private_cache, event_notifier_priv);
1371cache_private_error:
dffef45d
FD		 1372 kmem_cache_free(event_notifier_cache, event_notifier);
1373cache_error:
1374exist:
1375type_error:
1376 return ERR_PTR(ret);
1377}
1378
99f52fcc
FD		 1379int lttng_kernel_counter_read(struct lttng_counter *counter,
1380 const size_t *dim_indexes, int32_t cpu,
1381 int64_t *val, bool *overflow, bool *underflow)
1382{
1383 return counter->ops->counter_read(counter->counter, dim_indexes,
1384 cpu, val, overflow, underflow);
1385}
1386
1387int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1388 const size_t *dim_indexes, int64_t *val,
1389 bool *overflow, bool *underflow)
1390{
1391 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1392 val, overflow, underflow);
1393}
1394
1395int lttng_kernel_counter_clear(struct lttng_counter *counter,
1396 const size_t *dim_indexes)
1397{
1398 return counter->ops->counter_clear(counter->counter, dim_indexes);
1399}
1400
ac847066 1401struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan,
606828e4 1402 struct lttng_kernel_abi_event *event_param,
437d5aa5 1403 const struct lttng_kernel_event_desc *event_desc,
606828e4 1404 enum lttng_kernel_abi_instrumentation itype)
3c997079 1405{
a67ba386 1406 struct lttng_kernel_event_recorder *event;
3c997079
MD		 1407
1408 mutex_lock(&sessions_mutex);
a67ba386 1409 event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype);
3c997079
MD		 1410 mutex_unlock(&sessions_mutex);
1411 return event;
1412}
1413
a67ba386 1414struct lttng_kernel_event_notifier *lttng_event_notifier_create(
437d5aa5 1415 const struct lttng_kernel_event_desc *event_desc,
99f52fcc
FD		 1416 uint64_t id, uint64_t error_counter_index,
1417 struct lttng_event_notifier_group *event_notifier_group,
606828e4 1418 struct lttng_kernel_abi_event_notifier *event_notifier_param,
a67ba386 1419 enum lttng_kernel_abi_instrumentation itype)
dffef45d 1420{
a67ba386 1421 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 1422
1423 mutex_lock(&sessions_mutex);
1424 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc 1425 error_counter_index, event_notifier_group,
a67ba386 1426 event_notifier_param, itype);
dffef45d
FD		 1427 mutex_unlock(&sessions_mutex);
1428 return event_notifier;
1429}
1430
3c997079
MD		 1431/* Only used for tracepoints for now. */
1432static
a67ba386 1433void register_event(struct lttng_kernel_event_recorder *event_recorder)
3c997079 1434{
437d5aa5 1435 const struct lttng_kernel_event_desc *desc;
f127e61e 1436 int ret = -EINVAL;
3c997079 1437
38b35aff 1438 WARN_ON_ONCE(event_recorder->priv->parent.registered);
4ecb5ad5 1439
a67ba386
MD		 1440 desc = event_recorder->priv->parent.desc;
1441 switch (event_recorder->priv->parent.instrumentation) {
606828e4 1442 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1443 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
e69abdfd 1444 desc->tp_class->probe_callback,
a67ba386 1445 event_recorder);
4ecb5ad5 1446 break;
b4a75708 1447
606828e4 1448 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1449 ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1450 break;
b4a75708 1451
c570be0d
MJ		 1452 case LTTNG_KERNEL_ABI_KPROBE:
1453 lttng_fallthrough;
1454 case LTTNG_KERNEL_ABI_UPROBE:
1455 lttng_fallthrough;
606828e4 1456 case LTTNG_KERNEL_ABI_KRETPROBE:
4ecb5ad5
MD		 1457 ret = 0;
1458 break;
b4a75708 1459
c570be0d
MJ		 1460 case LTTNG_KERNEL_ABI_FUNCTION:
1461 lttng_fallthrough;
1462 case LTTNG_KERNEL_ABI_NOOP:
1463 lttng_fallthrough;
4ecb5ad5
MD		 1464 default:
1465 WARN_ON_ONCE(1);
1466 }
3c997079 1467 if (!ret)
a67ba386 1468 event_recorder->priv->parent.registered = 1;
3c997079
MD		 1469}
1470
4e3c1b9b
MD		 1471/*
1472 * Only used internally at session destruction.
1473 */
38b35aff
MD		 1474static
1475void unregister_event(struct lttng_kernel_event_recorder *event_recorder)
4e3c1b9b 1476{
a67ba386 1477 struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent;
437d5aa5 1478 const struct lttng_kernel_event_desc *desc;
11b5a3c2
MD		 1479 int ret = -EINVAL;
1480
38b35aff 1481 WARN_ON_ONCE(!event_priv->registered);
3c997079 1482
a67ba386
MD		 1483 desc = event_priv->desc;
1484 switch (event_priv->instrumentation) {
606828e4 1485 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1486 ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname,
e69abdfd 1487 event_priv->desc->tp_class->probe_callback,
a67ba386 1488 event_recorder);
baf20995 1489 break;
b4a75708 1490
606828e4 1491 case LTTNG_KERNEL_ABI_KPROBE:
a67ba386 1492 lttng_kprobes_unregister_event(event_recorder);
d6d808f3
MD		 1493 ret = 0;
1494 break;
b4a75708 1495
606828e4 1496 case LTTNG_KERNEL_ABI_KRETPROBE:
a67ba386 1497 lttng_kretprobes_unregister(event_recorder);
7371f44c
MD		 1498 ret = 0;
1499 break;
b4a75708 1500
606828e4 1501 case LTTNG_KERNEL_ABI_SYSCALL:
a67ba386 1502 ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder);
4ecb5ad5 1503 break;
b4a75708 1504
606828e4 1505 case LTTNG_KERNEL_ABI_NOOP:
259b6cb3
MD		 1506 ret = 0;
1507 break;
b4a75708 1508
606828e4 1509 case LTTNG_KERNEL_ABI_UPROBE:
a67ba386 1510 lttng_uprobes_unregister_event(event_recorder);
149b9a9d
YB		 1511 ret = 0;
1512 break;
b4a75708 1513
c570be0d
MJ		 1514 case LTTNG_KERNEL_ABI_FUNCTION:
1515 lttng_fallthrough;
baf20995
MD		 1516 default:
1517 WARN_ON_ONCE(1);
1518 }
38b35aff 1519 WARN_ON_ONCE(ret);
3c997079 1520 if (!ret)
a67ba386 1521 event_priv->registered = 0;
38b35aff
MD		 1522}
1523
1524static
1525void _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder)
1526{
1527 if (event_recorder->priv->parent.registered)
1528 unregister_event(event_recorder);
dda6a249
MD		 1529}
1530
dffef45d
FD		 1531/* Only used for tracepoints for now. */
1532static
a67ba386 1533void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1534{
437d5aa5 1535 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1536 int ret = -EINVAL;
1537
38b35aff 1538 WARN_ON_ONCE(event_notifier->priv->parent.registered);
dffef45d 1539
a67ba386
MD		 1540 desc = event_notifier->priv->parent.desc;
1541 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1542 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 1543 ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname,
e69abdfd 1544 desc->tp_class->probe_callback,
b01155ba
FD		 1545 event_notifier);
1546 break;
b4a75708 1547
606828e4 1548 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1549 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1550 break;
b4a75708 1551
c570be0d
MJ		 1552 case LTTNG_KERNEL_ABI_KPROBE:
1553 lttng_fallthrough;
606828e4 1554 case LTTNG_KERNEL_ABI_UPROBE:
2b16f0c9
FD		 1555 ret = 0;
1556 break;
b4a75708 1557
c570be0d
MJ		 1558 case LTTNG_KERNEL_ABI_KRETPROBE:
1559 lttng_fallthrough;
1560 case LTTNG_KERNEL_ABI_FUNCTION:
1561 lttng_fallthrough;
1562 case LTTNG_KERNEL_ABI_NOOP:
1563 lttng_fallthrough;
dffef45d
FD		 1564 default:
1565 WARN_ON_ONCE(1);
1566 }
1567 if (!ret)
a67ba386 1568 event_notifier->priv->parent.registered = 1;
dffef45d
FD		 1569}
1570
1571static
38b35aff 1572int unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
dffef45d 1573{
437d5aa5 1574 const struct lttng_kernel_event_desc *desc;
dffef45d
FD		 1575 int ret = -EINVAL;
1576
38b35aff 1577 WARN_ON_ONCE(!event_notifier->priv->parent.registered);
dffef45d 1578
a67ba386
MD		 1579 desc = event_notifier->priv->parent.desc;
1580 switch (event_notifier->priv->parent.instrumentation) {
606828e4 1581 case LTTNG_KERNEL_ABI_TRACEPOINT:
a67ba386 1582 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname,
e69abdfd 1583 event_notifier->priv->parent.desc->tp_class->probe_callback,
b01155ba
FD		 1584 event_notifier);
1585 break;
b4a75708 1586
606828e4 1587 case LTTNG_KERNEL_ABI_KPROBE:
2b16f0c9
FD		 1588 lttng_kprobes_unregister_event_notifier(event_notifier);
1589 ret = 0;
1590 break;
b4a75708 1591
606828e4 1592 case LTTNG_KERNEL_ABI_UPROBE:
9de67196
FD		 1593 lttng_uprobes_unregister_event_notifier(event_notifier);
1594 ret = 0;
1595 break;
b4a75708 1596
606828e4 1597 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 1598 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1599 break;
b4a75708 1600
c570be0d
MJ		 1601 case LTTNG_KERNEL_ABI_KRETPROBE:
1602 lttng_fallthrough;
1603 case LTTNG_KERNEL_ABI_FUNCTION:
1604 lttng_fallthrough;
1605 case LTTNG_KERNEL_ABI_NOOP:
1606 lttng_fallthrough;
dffef45d
FD		 1607 default:
1608 WARN_ON_ONCE(1);
1609 }
1610 if (!ret)
a67ba386 1611 event_notifier->priv->parent.registered = 0;
dffef45d
FD		 1612 return ret;
1613}
1614
38b35aff
MD		 1615static
1616void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier)
1617{
1618 if (event_notifier->priv->parent.registered)
1619 unregister_event_notifier(event_notifier);
1620}
1621
dda6a249
MD		 1622/*
1623 * Only used internally at session destruction.
1624 */
be066e6c 1625static
0648898e 1626void _lttng_event_destroy(struct lttng_kernel_event_common *event)
dda6a249 1627{
0648898e 1628 struct lttng_kernel_event_common_private *event_priv = event->priv;
966ad253
MD		 1629 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
1630
0648898e
MD		 1631 lttng_free_event_filter_runtime(event);
1632 /* Free event enabler refs */
1633 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
1634 &event_priv->enablers_ref_head, node)
1635 kfree(enabler_ref);
b4a75708 1636
0648898e
MD		 1637 switch (event->type) {
1638 case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
1639 {
1640 struct lttng_kernel_event_recorder *event_recorder =
1641 container_of(event, struct lttng_kernel_event_recorder, parent);
b4a75708 1642
0648898e
MD		 1643 switch (event_priv->instrumentation) {
1644 case LTTNG_KERNEL_ABI_TRACEPOINT:
1645 lttng_event_desc_put(event_priv->desc);
1646 break;
b4a75708 1647
0648898e
MD		 1648 case LTTNG_KERNEL_ABI_KPROBE:
1649 module_put(event_priv->desc->owner);
1650 lttng_kprobes_destroy_event_private(event_recorder);
1651 break;
b4a75708 1652
0648898e
MD		 1653 case LTTNG_KERNEL_ABI_KRETPROBE:
1654 module_put(event_priv->desc->owner);
1655 lttng_kretprobes_destroy_private(event_recorder);
1656 break;
b4a75708 1657
0648898e
MD		 1658 case LTTNG_KERNEL_ABI_SYSCALL:
1659 break;
4e3c1b9b 1660
0648898e
MD		 1661 case LTTNG_KERNEL_ABI_UPROBE:
1662 module_put(event_priv->desc->owner);
1663 lttng_uprobes_destroy_event_private(event_recorder);
1664 break;
3ef5cc03 1665
c570be0d
MJ		 1666 case LTTNG_KERNEL_ABI_FUNCTION:
1667 lttng_fallthrough;
1668 case LTTNG_KERNEL_ABI_NOOP:
1669 lttng_fallthrough;
0648898e
MD		 1670 default:
1671 WARN_ON_ONCE(1);
1672 }
1673 list_del(&event_recorder->priv->node);
1674 kmem_cache_free(event_recorder_private_cache, event_recorder->priv);
1675 kmem_cache_free(event_recorder_cache, event_recorder);
b01155ba 1676 break;
0648898e
MD		 1677 }
1678 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
1679 {
1680 struct lttng_kernel_event_notifier *event_notifier =
1681 container_of(event, struct lttng_kernel_event_notifier, parent);
b4a75708 1682
0648898e
MD		 1683 switch (event_notifier->priv->parent.instrumentation) {
1684 case LTTNG_KERNEL_ABI_TRACEPOINT:
1685 lttng_event_desc_put(event_notifier->priv->parent.desc);
1686 break;
b4a75708 1687
0648898e
MD		 1688 case LTTNG_KERNEL_ABI_KPROBE:
1689 module_put(event_notifier->priv->parent.desc->owner);
1690 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1691 break;
b4a75708 1692
0648898e
MD		 1693 case LTTNG_KERNEL_ABI_SYSCALL:
1694 break;
b4a75708 1695
0648898e
MD		 1696 case LTTNG_KERNEL_ABI_UPROBE:
1697 module_put(event_notifier->priv->parent.desc->owner);
1698 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1699 break;
1700
c570be0d
MJ		 1701 case LTTNG_KERNEL_ABI_KRETPROBE:
1702 lttng_fallthrough;
1703 case LTTNG_KERNEL_ABI_FUNCTION:
1704 lttng_fallthrough;
1705 case LTTNG_KERNEL_ABI_NOOP:
1706 lttng_fallthrough;
0648898e
MD		 1707 default:
1708 WARN_ON_ONCE(1);
1709 }
1710 list_del(&event_notifier->priv->node);
1711 kmem_cache_free(event_notifier_private_cache, event_notifier->priv);
1712 kmem_cache_free(event_notifier_cache, event_notifier);
1713 break;
1714 }
dffef45d
FD		 1715 default:
1716 WARN_ON_ONCE(1);
1717 }
dffef45d
FD		 1718}
1719
a2fa977a 1720struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session,
d1f652f8 1721 enum tracker_type tracker_type)
e0130fab 1722{
d1f652f8
MD		 1723 switch (tracker_type) {
1724 case TRACKER_PID:
1725 return &session->pid_tracker;
1726 case TRACKER_VPID:
1727 return &session->vpid_tracker;
1728 case TRACKER_UID:
1729 return &session->uid_tracker;
1730 case TRACKER_VUID:
1731 return &session->vuid_tracker;
1732 case TRACKER_GID:
1733 return &session->gid_tracker;
1734 case TRACKER_VGID:
1735 return &session->vgid_tracker;
1736 default:
1737 WARN_ON_ONCE(1);
1738 return NULL;
1739 }
1740}
1741
a40e3229 1742int lttng_session_track_id(struct lttng_kernel_session *session,
d1f652f8
MD		 1743 enum tracker_type tracker_type, int id)
1744{
a2fa977a 1745 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1746 int ret;
1747
d1f652f8
MD		 1748 tracker = get_tracker(session, tracker_type);
1749 if (!tracker)
1750 return -EINVAL;
1751 if (id < -1)
e0130fab
MD		 1752 return -EINVAL;
1753 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1754 if (id == -1) {
1755 /* track all ids: destroy tracker. */
1756 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1757 ret = 0;
1758 } else {
d1f652f8 1759 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1760 }
e0130fab
MD		 1761 mutex_unlock(&sessions_mutex);
1762 return ret;
1763}
1764
a40e3229 1765int lttng_session_untrack_id(struct lttng_kernel_session *session,
d1f652f8 1766 enum tracker_type tracker_type, int id)
e0130fab 1767{
a2fa977a 1768 struct lttng_kernel_id_tracker *tracker;
e0130fab
MD		 1769 int ret;
1770
d1f652f8
MD		 1771 tracker = get_tracker(session, tracker_type);
1772 if (!tracker)
1773 return -EINVAL;
1774 if (id < -1)
e0130fab
MD		 1775 return -EINVAL;
1776 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1777 if (id == -1) {
1778 /* untrack all ids: replace by empty tracker. */
1779 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1780 } else {
d1f652f8 1781 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1782 }
e0130fab
MD		 1783 mutex_unlock(&sessions_mutex);
1784 return ret;
1785}
1786
7e6f9ef6 1787static
d1f652f8 1788void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1789{
a2fa977a
MD		 1790 struct lttng_kernel_id_tracker *id_tracker = m->private;
1791 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1792 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1793 int iter = 0, i;
1794
1795 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1796 if (id_tracker_p) {
1797 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1798 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1799
f934e302 1800 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1801 if (iter++ >= *pos)
1802 return e;
1803 }
1804 }
1805 } else {
d1f652f8 1806 /* ID tracker disabled. */
7e6f9ef6 1807 if (iter >= *pos && iter == 0) {
d1f652f8 1808 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1809 }
1810 iter++;
1811 }
1812 /* End of list */
1813 return NULL;
1814}
1815
1816/* Called with sessions_mutex held. */
1817static
d1f652f8 1818void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1819{
a2fa977a
MD		 1820 struct lttng_kernel_id_tracker *id_tracker = m->private;
1821 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1822 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1823 int iter = 0, i;
1824
1825 (*ppos)++;
d1f652f8
MD		 1826 if (id_tracker_p) {
1827 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1828 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1829
f934e302 1830 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1831 if (iter++ >= *ppos)
1832 return e;
1833 }
1834 }
1835 } else {
d1f652f8 1836 /* ID tracker disabled. */
7e6f9ef6 1837 if (iter >= *ppos && iter == 0)
d1f652f8 1838 return p; /* empty tracker */
7e6f9ef6
MD		 1839 iter++;
1840 }
1841
1842 /* End of list */
1843 return NULL;
1844}
1845
1846static
d1f652f8 1847void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1848{
1849 mutex_unlock(&sessions_mutex);
1850}
1851
1852static
d1f652f8 1853int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1854{
a2fa977a
MD		 1855 struct lttng_kernel_id_tracker *id_tracker = m->private;
1856 struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p;
d1f652f8 1857 int id;
7e6f9ef6 1858
d1f652f8 1859 if (p == id_tracker_p) {
7e6f9ef6 1860 /* Tracker disabled. */
d1f652f8 1861 id = -1;
7e6f9ef6 1862 } else {
d1f652f8 1863 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1864
d1f652f8
MD		 1865 id = lttng_id_tracker_get_node_id(e);
1866 }
a2fa977a 1867 switch (id_tracker->priv->tracker_type) {
d1f652f8
MD		 1868 case TRACKER_PID:
1869 seq_printf(m, "process { pid = %d; };\n", id);
1870 break;
1871 case TRACKER_VPID:
1872 seq_printf(m, "process { vpid = %d; };\n", id);
1873 break;
1874 case TRACKER_UID:
1875 seq_printf(m, "user { uid = %d; };\n", id);
1876 break;
1877 case TRACKER_VUID:
1878 seq_printf(m, "user { vuid = %d; };\n", id);
1879 break;
1880 case TRACKER_GID:
1881 seq_printf(m, "group { gid = %d; };\n", id);
1882 break;
1883 case TRACKER_VGID:
1884 seq_printf(m, "group { vgid = %d; };\n", id);
1885 break;
1886 default:
1887 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1888 }
7e6f9ef6
MD		 1889 return 0;
1890}
1891
1892static
d1f652f8
MD		 1893const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1894 .start = id_list_start,
1895 .next = id_list_next,
1896 .stop = id_list_stop,
1897 .show = id_list_show,
7e6f9ef6
MD		 1898};
1899
1900static
d1f652f8 1901int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1902{
d1f652f8 1903 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1904}
1905
1906static
d1f652f8 1907int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1908{
1909 struct seq_file *m = file->private_data;
a2fa977a 1910 struct lttng_kernel_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1911 int ret;
1912
d1f652f8 1913 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1914 ret = seq_release(inode, file);
d1f652f8 1915 if (!ret)
a2fa977a 1916 fput(id_tracker->priv->session->priv->file);
7e6f9ef6
MD		 1917 return ret;
1918}
1919
d1f652f8 1920const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1921 .owner = THIS_MODULE,
d1f652f8 1922 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1923 .read = seq_read,
1924 .llseek = seq_lseek,
d1f652f8 1925 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1926};
1927
a40e3229 1928int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
d1f652f8 1929 enum tracker_type tracker_type)
7e6f9ef6 1930{
d1f652f8 1931 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1932 struct seq_file *m;
1933 int file_fd, ret;
1934
1935 file_fd = lttng_get_unused_fd();
1936 if (file_fd < 0) {
1937 ret = file_fd;
1938 goto fd_error;
1939 }
1940
d1f652f8
MD		 1941 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1942 &lttng_tracker_ids_list_fops,
7e6f9ef6 1943 NULL, O_RDWR);
d1f652f8
MD		 1944 if (IS_ERR(tracker_ids_list_file)) {
1945 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1946 goto file_error;
1947 }
a40e3229 1948 if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
98d7281c 1949 ret = -EOVERFLOW;
9c1f4643
MD		 1950 goto refcount_error;
1951 }
d1f652f8 1952 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1953 if (ret < 0)
1954 goto open_error;
d1f652f8
MD		 1955 m = tracker_ids_list_file->private_data;
1956
1957 m->private = get_tracker(session, tracker_type);
1958 BUG_ON(!m->private);
1959 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1960
1961 return file_fd;
1962
1963open_error:
a40e3229 1964 atomic_long_dec(&session->priv->file->f_count);
9c1f4643 1965refcount_error:
d1f652f8 1966 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1967file_error:
1968 put_unused_fd(file_fd);
1969fd_error:
1970 return ret;
1971}
1972
3c997079
MD		 1973/*
1974 * Enabler management.
1975 */
1976static
4993071a
PP		 1977int lttng_match_enabler_star_glob(const char *desc_name,
1978 const char *pattern)
3c997079 1979{
cbc19040
MD		 1980 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1981 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1982 return 0;
1983 return 1;
1984}
1985
1986static
4ecb5ad5
MD		 1987int lttng_match_enabler_name(const char *desc_name,
1988 const char *name)
3c997079 1989{
4ecb5ad5 1990 if (strcmp(desc_name, name))
3c997079
MD		 1991 return 0;
1992 return 1;
1993}
1994
437d5aa5 1995int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
3c997079
MD		 1996 struct lttng_enabler *enabler)
1997{
4ecb5ad5 1998 const char *desc_name, *enabler_name;
badfe9f5 1999 bool compat = false, entry = false;
4ecb5ad5
MD		 2000
2001 enabler_name = enabler->event_param.name;
2002 switch (enabler->event_param.instrumentation) {
606828e4 2003 case LTTNG_KERNEL_ABI_TRACEPOINT:
437d5aa5 2004 desc_name = desc->event_name;
3b861b22
FD		 2005 switch (enabler->format_type) {
2006 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2007 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2008 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2009 return lttng_match_enabler_name(desc_name, enabler_name);
2010 default:
2011 return -EINVAL;
2012 }
4ecb5ad5 2013 break;
b4a75708 2014
606828e4 2015 case LTTNG_KERNEL_ABI_SYSCALL:
437d5aa5 2016 desc_name = desc->event_name;
badfe9f5 2017 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 2018 desc_name += strlen("compat_");
badfe9f5
MD		 2019 compat = true;
2020 }
4ecb5ad5
MD		 2021 if (!strncmp(desc_name, "syscall_exit_",
2022 strlen("syscall_exit_"))) {
2023 desc_name += strlen("syscall_exit_");
2024 } else if (!strncmp(desc_name, "syscall_entry_",
2025 strlen("syscall_entry_"))) {
2026 desc_name += strlen("syscall_entry_");
badfe9f5 2027 entry = true;
4ecb5ad5
MD		 2028 } else {
2029 WARN_ON_ONCE(1);
2030 return -EINVAL;
2031 }
badfe9f5 2032 switch (enabler->event_param.u.syscall.entryexit) {
606828e4 2033 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5 2034 break;
606828e4 2035 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
badfe9f5
MD		 2036 if (!entry)
2037 return 0;
2038 break;
606828e4 2039 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
badfe9f5
MD		 2040 if (entry)
2041 return 0;
2042 break;
2043 default:
2044 return -EINVAL;
2045 }
2046 switch (enabler->event_param.u.syscall.abi) {
606828e4 2047 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5 2048 break;
606828e4 2049 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE:
badfe9f5
MD		 2050 if (compat)
2051 return 0;
2052 break;
606828e4 2053 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT:
badfe9f5
MD		 2054 if (!compat)
2055 return 0;
2056 break;
2057 default:
2058 return -EINVAL;
2059 }
2060 switch (enabler->event_param.u.syscall.match) {
606828e4 2061 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
3b861b22
FD		 2062 switch (enabler->format_type) {
2063 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 2064 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 2065 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 2066 return lttng_match_enabler_name(desc_name, enabler_name);
2067 default:
2068 return -EINVAL;
2069 }
2070 break;
606828e4 2071 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR:
badfe9f5
MD		 2072 return -EINVAL; /* Not implemented. */
2073 default:
2074 return -EINVAL;
2075 }
4ecb5ad5 2076 break;
b4a75708 2077
4ecb5ad5
MD		 2078 default:
2079 WARN_ON_ONCE(1);
2080 return -EINVAL;
2081 }
3c997079
MD		 2082}
2083
2084static
b2bc0bc8 2085int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
a67ba386 2086 struct lttng_kernel_event_recorder *event_recorder)
3c997079 2087{
b2bc0bc8
FD		 2088 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
2089 event_enabler);
2090
a67ba386 2091 if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation)
33a39a3c 2092 return 0;
a67ba386
MD		 2093 if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler)
2094 && event_recorder->chan == event_enabler->chan)
3c997079
MD		 2095 return 1;
2096 else
2097 return 0;
2098}
2099
b01155ba
FD		 2100static
2101int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
a67ba386 2102 struct lttng_kernel_event_notifier *event_notifier)
b01155ba
FD		 2103{
2104 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
2105 event_notifier_enabler);
2106
a67ba386 2107 if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation)
b01155ba 2108 return 0;
a67ba386
MD		 2109 if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler)
2110 && event_notifier->priv->group == event_notifier_enabler->group
2111 && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2112 return 1;
2113 else
2114 return 0;
2115}
2116
3c997079 2117static
b2bc0bc8
FD		 2118struct lttng_enabler_ref *lttng_enabler_ref(
2119 struct list_head *enablers_ref_list,
3c997079
MD		 2120 struct lttng_enabler *enabler)
2121{
2122 struct lttng_enabler_ref *enabler_ref;
2123
b2bc0bc8 2124 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 2125 if (enabler_ref->ref == enabler)
2126 return enabler_ref;
2127 }
2128 return NULL;
2129}
2130
3c997079 2131static
1b917d6b 2132void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 2133{
ac847066 2134 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
437d5aa5
MD		 2135 struct lttng_kernel_probe_desc *probe_desc;
2136 const struct lttng_kernel_event_desc *desc;
3c997079
MD		 2137 int i;
2138 struct list_head *probe_list;
2139
2140 probe_list = lttng_get_probe_list_head();
2141 /*
2142 * For each probe event, if we find that a probe event matches
2143 * our enabler, create an associated lttng_event if not
2144 * already present.
2145 */
2146 list_for_each_entry(probe_desc, probe_list, head) {
2147 for (i = 0; i < probe_desc->nr_events; i++) {
2148 int found = 0;
2149 struct hlist_head *head;
a67ba386
MD		 2150 struct lttng_kernel_event_recorder_private *event_recorder_private;
2151 struct lttng_kernel_event_recorder *event_recorder;
3c997079
MD		 2152
2153 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 2154 if (!lttng_desc_match_enabler(desc,
2155 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 2156 continue;
3c997079
MD		 2157
2158 /*
2159 * Check if already created.
2160 */
4a11ef1c 2161 head = utils_borrow_hash_table_bucket(
a40e3229 2162 session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
437d5aa5 2163 desc->event_name);
a67ba386
MD		 2164 lttng_hlist_for_each_entry(event_recorder_private, head, hlist) {
2165 if (event_recorder_private->parent.desc == desc
2166 && event_recorder_private->pub->chan == event_enabler->chan)
3c997079
MD		 2167 found = 1;
2168 }
2169 if (found)
2170 continue;
2171
2172 /*
2173 * We need to create an event for this
2174 * event probe.
2175 */
a67ba386
MD		 2176 event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan,
2177 NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT);
2178 if (!event_recorder) {
5a15f70c 2179 printk(KERN_INFO "LTTng: Unable to create event %s\n",
437d5aa5 2180 probe_desc->event_desc[i]->event_name);
3c997079
MD		 2181 }
2182 }
2183 }
2184}
2185
b01155ba
FD		 2186static
2187void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2188{
2189 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
437d5aa5
MD		 2190 struct lttng_kernel_probe_desc *probe_desc;
2191 const struct lttng_kernel_event_desc *desc;
b01155ba
FD		 2192 int i;
2193 struct list_head *probe_list;
2194
2195 probe_list = lttng_get_probe_list_head();
2196 /*
2197 * For each probe event, if we find that a probe event matches
2198 * our enabler, create an associated lttng_event_notifier if not
2199 * already present.
2200 */
2201 list_for_each_entry(probe_desc, probe_list, head) {
2202 for (i = 0; i < probe_desc->nr_events; i++) {
2203 int found = 0;
2204 struct hlist_head *head;
a67ba386
MD		 2205 struct lttng_kernel_event_notifier_private *event_notifier_priv;
2206 struct lttng_kernel_event_notifier *event_notifier;
b01155ba
FD		 2207
2208 desc = probe_desc->event_desc[i];
2209 if (!lttng_desc_match_enabler(desc,
2210 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2211 continue;
2212
2213 /*
2214 * Check if already created.
2215 */
2216 head = utils_borrow_hash_table_bucket(
2217 event_notifier_group->event_notifiers_ht.table,
437d5aa5 2218 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
a67ba386
MD		 2219 lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
2220 if (event_notifier_priv->parent.desc == desc
2221 && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token)
b01155ba
FD		 2222 found = 1;
2223 }
2224 if (found)
2225 continue;
2226
2227 /*
2228 * We need to create a event_notifier for this event probe.
2229 */
2230 event_notifier = _lttng_event_notifier_create(desc,
2231 event_notifier_enabler->base.user_token,
99f52fcc 2232 event_notifier_enabler->error_counter_index,
a67ba386 2233 event_notifier_group, NULL,
606828e4 2234 LTTNG_KERNEL_ABI_TRACEPOINT);
b01155ba
FD		 2235 if (IS_ERR(event_notifier)) {
2236 printk(KERN_INFO "Unable to create event_notifier %s\n",
437d5aa5 2237 probe_desc->event_desc[i]->event_name);
b01155ba
FD		 2238 }
2239 }
2240 }
2241}
2242
33a39a3c 2243static
1b917d6b 2244void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2245{
2246 int ret;
2247
a67ba386 2248 ret = lttng_syscalls_register_event(event_enabler);
33a39a3c
MD		 2249 WARN_ON_ONCE(ret);
2250}
2251
8a8ac9a8
FD		 2252static
2253void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2254{
2255 int ret;
2256
a67ba386 2257 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler);
8a8ac9a8 2258 WARN_ON_ONCE(ret);
a67ba386 2259 ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler);
8a8ac9a8
FD		 2260 WARN_ON_ONCE(ret);
2261}
2262
33a39a3c 2263/*
a67ba386 2264 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
33a39a3c
MD		 2265 * tracepoint probes.
2266 * Should be called with sessions mutex held.
2267 */
2268static
b2bc0bc8 2269void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2270{
b2bc0bc8 2271 switch (event_enabler->base.event_param.instrumentation) {
606828e4 2272 case LTTNG_KERNEL_ABI_TRACEPOINT:
1b917d6b 2273 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c 2274 break;
b4a75708 2275
606828e4 2276 case LTTNG_KERNEL_ABI_SYSCALL:
1b917d6b 2277 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c 2278 break;
b4a75708 2279
33a39a3c
MD		 2280 default:
2281 WARN_ON_ONCE(1);
2282 break;
2283 }
2284}
2285
3c997079 2286/*
b2bc0bc8 2287 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2288 * and add backward reference from the event to the enabler.
2289 * Should be called with sessions mutex held.
2290 */
2291static
b2bc0bc8 2292int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2293{
ac847066
MD		 2294 struct lttng_kernel_channel_buffer *chan = event_enabler->chan;
2295 struct lttng_kernel_session *session = event_enabler->chan->parent.session;
b2bc0bc8 2296 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
a67ba386 2297 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2298
606828e4
MD		 2299 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2300 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2301 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
b2bc0bc8 2302 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1 2303 int enabled = base_enabler->enabled;
606828e4 2304 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
3b82c4e1 2305
606828e4 2306 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
ac847066 2307 WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled);
3b82c4e1 2308
606828e4 2309 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
ac847066 2310 WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled);
badfe9f5
MD		 2311 }
2312
3c997079 2313 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2314 lttng_create_event_if_missing(event_enabler);
3c997079 2315
b2bc0bc8 2316 /* For each event matching event_enabler in session event list. */
a40e3229 2317 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2318 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079
MD		 2319 struct lttng_enabler_ref *enabler_ref;
2320
a67ba386 2321 if (!lttng_event_enabler_match_event(event_enabler, event_recorder))
3c997079 2322 continue;
a67ba386 2323 enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head,
b2bc0bc8 2324 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2325 if (!enabler_ref) {
2326 /*
2327 * If no backward ref, create it.
b2bc0bc8 2328 * Add backward ref from event to event_enabler.
3c997079
MD		 2329 */
2330 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2331 if (!enabler_ref)
2332 return -ENOMEM;
b2bc0bc8 2333 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079 2334 list_add(&enabler_ref->node,
a67ba386 2335 &event_recorder_priv->parent.enablers_ref_head);
3c997079
MD		 2336 }
2337
f127e61e
MD		 2338 /*
2339 * Link filter bytecodes if not linked yet.
2340 */
a67ba386 2341 lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
2dfda770 2342 lttng_static_ctx,
a67ba386 2343 &event_recorder_priv->parent.filter_bytecode_runtime_head,
60206944 2344 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
3c997079
MD		 2345 }
2346 return 0;
2347}
2348
b01155ba 2349/*
a67ba386 2350 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
b01155ba
FD		 2351 * tracepoint probes.
2352 * Should be called with sessions mutex held.
2353 */
2354static
2355void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2356{
2357 switch (event_notifier_enabler->base.event_param.instrumentation) {
606828e4 2358 case LTTNG_KERNEL_ABI_TRACEPOINT:
b01155ba
FD		 2359 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2360 break;
b4a75708 2361
606828e4 2362 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8
FD		 2363 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2364 break;
b4a75708 2365
b01155ba
FD		 2366 default:
2367 WARN_ON_ONCE(1);
2368 break;
2369 }
2370}
2371
2372/*
2373 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2374 */
2375static
8a8ac9a8
FD		 2376int lttng_event_notifier_enabler_ref_event_notifiers(
2377 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2378{
2379 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2380 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
a67ba386 2381 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba 2382
606828e4
MD		 2383 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL &&
2384 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL &&
2385 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME &&
8a8ac9a8
FD		 2386 !strcmp(base_enabler->event_param.name, "*")) {
2387
2388 int enabled = base_enabler->enabled;
606828e4 2389 enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
8a8ac9a8 2390
606828e4 2391 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2392 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2393
606828e4 2394 if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT)
8a8ac9a8
FD		 2395 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2396
2397 }
2398
b01155ba
FD		 2399 /* First ensure that probe event_notifiers are created for this enabler. */
2400 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2401
2402 /* Link the created event_notifier with its associated enabler. */
a67ba386
MD		 2403 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2404 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba
FD		 2405 struct lttng_enabler_ref *enabler_ref;
2406
2407 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2408 continue;
2409
a67ba386 2410 enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head,
b01155ba
FD		 2411 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2412 if (!enabler_ref) {
2413 /*
2414 * If no backward ref, create it.
2415 * Add backward ref from event_notifier to enabler.
2416 */
2417 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2418 if (!enabler_ref)
2419 return -ENOMEM;
2420
2421 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2422 event_notifier_enabler);
2423 list_add(&enabler_ref->node,
a67ba386 2424 &event_notifier_priv->parent.enablers_ref_head);
b01155ba
FD		 2425 }
2426
2427 /*
2428 * Link filter bytecodes if not linked yet.
2429 */
a67ba386
MD		 2430 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2431 lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head,
60206944 2432 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2433
2434 /* Link capture bytecodes if not linked yet. */
a67ba386
MD		 2435 lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
2436 lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head,
99d223ad
FD		 2437 &event_notifier_enabler->capture_bytecode_head);
2438
a67ba386 2439 event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2440 }
2441 return 0;
2442}
2443
3c997079
MD		 2444/*
2445 * Called at module load: connect the probe on all enablers matching
2446 * this event.
2447 * Called with sessions lock held.
2448 */
2449int lttng_fix_pending_events(void)
2450{
a40e3229 2451 struct lttng_kernel_session_private *session_priv;
3c997079 2452
a40e3229
MD		 2453 list_for_each_entry(session_priv, &sessions, list)
2454 lttng_session_lazy_sync_event_enablers(session_priv->pub);
3c997079
MD		 2455 return 0;
2456}
2457
b01155ba
FD		 2458static bool lttng_event_notifier_group_has_active_event_notifiers(
2459 struct lttng_event_notifier_group *event_notifier_group)
2460{
2461 struct lttng_event_notifier_enabler *event_notifier_enabler;
2462
2463 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2464 node) {
2465 if (event_notifier_enabler->base.enabled)
2466 return true;
2467 }
2468 return false;
2469}
2470
2471bool lttng_event_notifier_active(void)
2472{
2473 struct lttng_event_notifier_group *event_notifier_group;
2474
2475 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2476 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2477 return true;
2478 }
2479 return false;
2480}
2481
2482int lttng_fix_pending_event_notifiers(void)
2483{
2484 struct lttng_event_notifier_group *event_notifier_group;
2485
2486 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2487 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2488 return 0;
2489}
2490
b2bc0bc8
FD		 2491struct lttng_event_enabler *lttng_event_enabler_create(
2492 enum lttng_enabler_format_type format_type,
606828e4 2493 struct lttng_kernel_abi_event *event_param,
ac847066 2494 struct lttng_kernel_channel_buffer *chan)
3c997079 2495{
b2bc0bc8 2496 struct lttng_event_enabler *event_enabler;
3c997079 2497
b2bc0bc8
FD		 2498 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2499 if (!event_enabler)
3c997079 2500 return NULL;
b2bc0bc8
FD		 2501 event_enabler->base.format_type = format_type;
2502 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2503 memcpy(&event_enabler->base.event_param, event_param,
2504 sizeof(event_enabler->base.event_param));
2505 event_enabler->chan = chan;
3c997079 2506 /* ctx left NULL */
b2bc0bc8 2507 event_enabler->base.enabled = 0;
3c997079 2508 mutex_lock(&sessions_mutex);
ac847066
MD		 2509 list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head);
2510 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079 2511 mutex_unlock(&sessions_mutex);
b2bc0bc8 2512 return event_enabler;
3c997079
MD		 2513}
2514
b2bc0bc8 2515int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2516{
2517 mutex_lock(&sessions_mutex);
b2bc0bc8 2518 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
ac847066 2519 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079
MD		 2520 mutex_unlock(&sessions_mutex);
2521 return 0;
2522}
2523
b2bc0bc8 2524int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2525{
2526 mutex_lock(&sessions_mutex);
b2bc0bc8 2527 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
ac847066 2528 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
3c997079
MD		 2529 mutex_unlock(&sessions_mutex);
2530 return 0;
2531}
2532
b2bc0bc8 2533static
183e8b3a 2534int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
606828e4 2535 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
07dfc1d0 2536{
9906b046 2537 struct lttng_kernel_bytecode_node *bytecode_node;
07dfc1d0
MD		 2538 uint32_t bytecode_len;
2539 int ret;
2540
2541 ret = get_user(bytecode_len, &bytecode->len);
2542 if (ret)
2543 return ret;
52cfcdf3 2544 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2545 GFP_KERNEL);
2546 if (!bytecode_node)
2547 return -ENOMEM;
2548 ret = copy_from_user(&bytecode_node->bc, bytecode,
2549 sizeof(*bytecode) + bytecode_len);
2550 if (ret)
2551 goto error_free;
b2bc0bc8 2552
8a445457 2553 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER;
07dfc1d0
MD		 2554 bytecode_node->enabler = enabler;
2555 /* Enforce length based on allocated size */
2556 bytecode_node->bc.len = bytecode_len;
2557 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2558
07dfc1d0
MD		 2559 return 0;
2560
2561error_free:
52cfcdf3 2562 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2563 return ret;
2564}
2565
183e8b3a 2566int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
606828e4 2567 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
b2bc0bc8
FD		 2568{
2569 int ret;
183e8b3a 2570 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2571 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2572 if (ret)
2573 goto error;
2574
ac847066 2575 lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session);
b2bc0bc8
FD		 2576 return 0;
2577
2578error:
2579 return ret;
2580}
2581
e2d5dbc7 2582int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4 2583 struct lttng_kernel_abi_event_callsite __user *callsite)
3aed4dca
FD		 2584{
2585
e2d5dbc7 2586 switch (event->priv->instrumentation) {
606828e4 2587 case LTTNG_KERNEL_ABI_UPROBE:
e2d5dbc7 2588 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2589 default:
2590 return -EINVAL;
2591 }
2592}
2593
3c997079
MD		 2594static
2595void lttng_enabler_destroy(struct lttng_enabler *enabler)
2596{
9906b046 2597 struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2598
2599 /* Destroy filter bytecode */
2600 list_for_each_entry_safe(filter_node, tmp_filter_node,
2601 &enabler->filter_bytecode_head, node) {
52cfcdf3 2602 lttng_kvfree(filter_node);
07dfc1d0 2603 }
b2bc0bc8
FD		 2604}
2605
2606static
2607void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2608{
2609 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2610
b2bc0bc8
FD		 2611 list_del(&event_enabler->node);
2612 kfree(event_enabler);
3c997079
MD		 2613}
2614
dffef45d
FD		 2615struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2616 struct lttng_event_notifier_group *event_notifier_group,
2617 enum lttng_enabler_format_type format_type,
606828e4 2618 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2619{
2620 struct lttng_event_notifier_enabler *event_notifier_enabler;
2621
2622 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2623 if (!event_notifier_enabler)
2624 return NULL;
2625
2626 event_notifier_enabler->base.format_type = format_type;
2627 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2628 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2629
99f52fcc 2630 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2631 event_notifier_enabler->num_captures = 0;
dffef45d 2632
8a8ac9a8
FD		 2633 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2634 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2635
2636 event_notifier_enabler->base.enabled = 0;
2637 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2638 event_notifier_enabler->group = event_notifier_group;
2639
2640 mutex_lock(&sessions_mutex);
2641 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2642 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2643
2644 mutex_unlock(&sessions_mutex);
2645
2646 return event_notifier_enabler;
2647}
2648
2649int lttng_event_notifier_enabler_enable(
2650 struct lttng_event_notifier_enabler *event_notifier_enabler)
2651{
2652 mutex_lock(&sessions_mutex);
2653 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2654 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2655 mutex_unlock(&sessions_mutex);
2656 return 0;
2657}
2658
2659int lttng_event_notifier_enabler_disable(
2660 struct lttng_event_notifier_enabler *event_notifier_enabler)
2661{
2662 mutex_lock(&sessions_mutex);
2663 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2664 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2665 mutex_unlock(&sessions_mutex);
2666 return 0;
2667}
2668
183e8b3a 2669int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d 2670 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2671 struct lttng_kernel_abi_filter_bytecode __user *bytecode)
dffef45d
FD		 2672{
2673 int ret;
2674
183e8b3a 2675 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2676 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2677 bytecode);
2678 if (ret)
2679 goto error;
2680
b01155ba 2681 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2682 return 0;
2683
2684error:
2685 return ret;
2686}
2687
99d223ad
FD		 2688int lttng_event_notifier_enabler_attach_capture_bytecode(
2689 struct lttng_event_notifier_enabler *event_notifier_enabler,
606828e4 2690 struct lttng_kernel_abi_capture_bytecode __user *bytecode)
99d223ad 2691{
9906b046 2692 struct lttng_kernel_bytecode_node *bytecode_node;
99d223ad
FD		 2693 struct lttng_enabler *enabler =
2694 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2695 uint32_t bytecode_len;
2696 int ret;
2697
2698 ret = get_user(bytecode_len, &bytecode->len);
2699 if (ret)
2700 return ret;
2701
2702 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2703 GFP_KERNEL);
2704 if (!bytecode_node)
2705 return -ENOMEM;
2706
2707 ret = copy_from_user(&bytecode_node->bc, bytecode,
2708 sizeof(*bytecode) + bytecode_len);
2709 if (ret)
2710 goto error_free;
2711
8a445457 2712 bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE;
99d223ad
FD		 2713 bytecode_node->enabler = enabler;
2714
2715 /* Enforce length based on allocated size */
2716 bytecode_node->bc.len = bytecode_len;
2717 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2718
2719 event_notifier_enabler->num_captures++;
2720
2721 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2722 goto end;
2723
2724error_free:
2725 lttng_kvfree(bytecode_node);
2726end:
2727 return ret;
2728}
2729
dffef45d
FD		 2730static
2731void lttng_event_notifier_enabler_destroy(
2732 struct lttng_event_notifier_enabler *event_notifier_enabler)
2733{
2734 if (!event_notifier_enabler) {
2735 return;
2736 }
2737
2738 list_del(&event_notifier_enabler->node);
2739
2740 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2741 kfree(event_notifier_enabler);
2742}
2743
3c997079 2744/*
b2bc0bc8 2745 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2746 * session.
2747 * Should be called with sessions mutex held.
2748 */
2749static
a40e3229 2750void lttng_session_sync_event_enablers(struct lttng_kernel_session *session)
3c997079 2751{
b2bc0bc8 2752 struct lttng_event_enabler *event_enabler;
a67ba386 2753 struct lttng_kernel_event_recorder_private *event_recorder_priv;
3c997079 2754
a40e3229 2755 list_for_each_entry(event_enabler, &session->priv->enablers_head, node)
b2bc0bc8 2756 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2757 /*
2758 * For each event, if at least one of its enablers is enabled,
2759 * and its channel and session transient states are enabled, we
2760 * enable the event, else we disable it.
2761 */
a40e3229 2762 list_for_each_entry(event_recorder_priv, &session->priv->events, node) {
a67ba386 2763 struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub;
3c997079 2764 struct lttng_enabler_ref *enabler_ref;
dc7350d6 2765 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2766 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2767 int nr_filters = 0;
3c997079 2768
a67ba386 2769 switch (event_recorder_priv->parent.instrumentation) {
c570be0d
MJ		 2770 case LTTNG_KERNEL_ABI_TRACEPOINT:
2771 lttng_fallthrough;
606828e4 2772 case LTTNG_KERNEL_ABI_SYSCALL:
3c997079
MD		 2773 /* Enable events */
2774 list_for_each_entry(enabler_ref,
a67ba386 2775 &event_recorder_priv->parent.enablers_ref_head, node) {
3c997079
MD		 2776 if (enabler_ref->ref->enabled) {
2777 enabled = 1;
2778 break;
2779 }
2780 }
4ecb5ad5 2781 break;
b4a75708 2782
4ecb5ad5 2783 default:
3c997079
MD		 2784 /* Not handled with lazy sync. */
2785 continue;
2786 }
2787 /*
2788 * Enabled state is based on union of enablers, with
2789 * intesection of session and channel transient enable
2790 * states.
2791 */
ac847066 2792 enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate;
3c997079 2793
a67ba386 2794 WRITE_ONCE(event_recorder->parent.enabled, enabled);
3c997079
MD		 2795 /*
2796 * Sync tracepoint registration with event enabled
2797 * state.
2798 */
2799 if (enabled) {
38b35aff
MD		 2800 if (!event_recorder_priv->parent.registered)
2801 register_event(event_recorder);
3c997079 2802 } else {
38b35aff
MD		 2803 if (event_recorder_priv->parent.registered)
2804 _lttng_event_unregister(event_recorder);
3c997079 2805 }
07dfc1d0
MD		 2806
2807 /* Check if has enablers without bytecode enabled */
2808 list_for_each_entry(enabler_ref,
a67ba386 2809 &event_recorder_priv->parent.enablers_ref_head, node) {
07dfc1d0
MD		 2810 if (enabler_ref->ref->enabled
2811 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2812 has_enablers_without_filter_bytecode = 1;
07dfc1d0
MD		 2813 break;
2814 }
2815 }
a67ba386 2816 event_recorder_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2817 has_enablers_without_filter_bytecode;
07dfc1d0
MD		 2818
2819 /* Enable filters */
2820 list_for_each_entry(runtime,
e2d5dbc7 2821 &event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2822 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2823 nr_filters++;
2824 }
2825 WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter,
2826 !(has_enablers_without_filter_bytecode || !nr_filters));
3c997079
MD		 2827 }
2828}
2829
2830/*
2831 * Apply enablers to session events, adding events to session if need
2832 * be. It is required after each modification applied to an active
2833 * session, and right before session "start".
2834 * "lazy" sync means we only sync if required.
2835 * Should be called with sessions mutex held.
2836 */
2837static
a40e3229 2838void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session)
3c997079
MD		 2839{
2840 /* We can skip if session is not active */
2841 if (!session->active)
2842 return;
b2bc0bc8 2843 lttng_session_sync_event_enablers(session);
3c997079
MD		 2844}
2845
b01155ba
FD		 2846static
2847void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2848{
2849 struct lttng_event_notifier_enabler *event_notifier_enabler;
a67ba386 2850 struct lttng_kernel_event_notifier_private *event_notifier_priv;
b01155ba
FD		 2851
2852 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2853 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2854
2855 /*
2856 * For each event_notifier, if at least one of its enablers is enabled,
2857 * we enable the event_notifier, else we disable it.
2858 */
a67ba386
MD		 2859 list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
2860 struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
b01155ba 2861 struct lttng_enabler_ref *enabler_ref;
dc7350d6 2862 struct lttng_kernel_bytecode_runtime *runtime;
e2d5dbc7
MD		 2863 int enabled = 0, has_enablers_without_filter_bytecode = 0;
2864 int nr_filters = 0, nr_captures = 0;
b01155ba 2865
a67ba386 2866 switch (event_notifier_priv->parent.instrumentation) {
c570be0d
MJ		 2867 case LTTNG_KERNEL_ABI_TRACEPOINT:
2868 lttng_fallthrough;
606828e4 2869 case LTTNG_KERNEL_ABI_SYSCALL:
b01155ba
FD		 2870 /* Enable event_notifiers */
2871 list_for_each_entry(enabler_ref,
a67ba386 2872 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2873 if (enabler_ref->ref->enabled) {
2874 enabled = 1;
2875 break;
2876 }
2877 }
2878 break;
b4a75708 2879
b01155ba
FD		 2880 default:
2881 /* Not handled with sync. */
2882 continue;
2883 }
2884
a67ba386 2885 WRITE_ONCE(event_notifier->parent.enabled, enabled);
b01155ba
FD		 2886 /*
2887 * Sync tracepoint registration with event_notifier enabled
2888 * state.
2889 */
2890 if (enabled) {
a67ba386 2891 if (!event_notifier_priv->parent.registered)
b01155ba
FD		 2892 register_event_notifier(event_notifier);
2893 } else {
a67ba386 2894 if (event_notifier_priv->parent.registered)
38b35aff 2895 unregister_event_notifier(event_notifier);
b01155ba
FD		 2896 }
2897
2898 /* Check if has enablers without bytecode enabled */
2899 list_for_each_entry(enabler_ref,
a67ba386 2900 &event_notifier_priv->parent.enablers_ref_head, node) {
b01155ba
FD		 2901 if (enabler_ref->ref->enabled
2902 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
e2d5dbc7 2903 has_enablers_without_filter_bytecode = 1;
b01155ba
FD		 2904 break;
2905 }
2906 }
a67ba386 2907 event_notifier_priv->parent.has_enablers_without_filter_bytecode =
e2d5dbc7 2908 has_enablers_without_filter_bytecode;
b01155ba
FD		 2909
2910 /* Enable filters */
2911 list_for_each_entry(runtime,
e2d5dbc7 2912 &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
8a445457 2913 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2914 nr_filters++;
2915 }
2916 WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
2917 !(has_enablers_without_filter_bytecode || !nr_filters));
99d223ad
FD		 2918
2919 /* Enable captures */
2920 list_for_each_entry(runtime,
e2d5dbc7 2921 &event_notifier_priv->capture_bytecode_runtime_head, node) {
8a445457 2922 lttng_bytecode_sync_state(runtime);
e2d5dbc7
MD		 2923 nr_captures++;
2924 }
2925 WRITE_ONCE(event_notifier->eval_capture, !!nr_captures);
b01155ba
FD		 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,
4071a628 2942 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent)
d83004aa 2943{
e27e4381 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,
da1fe18f 2971 stream->transport->ops.priv->packet_avail_size(chan),
d83004aa 2972 len);
a775608d 2973 lib_ring_buffer_ctx_init(&ctx, chan, reserve_len,
c7d9db61 2974 sizeof(char), NULL);
d83004aa
JD		 2975 /*
2976 * If reservation failed, return an error to the caller.
2977 */
cefd899f 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,
77fcffef 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
a40e3229 3003void lttng_metadata_begin(struct lttng_kernel_session *session)
8b97fd42 3004{
a40e3229
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
a40e3229 3010void lttng_metadata_end(struct lttng_kernel_session *session)
8b97fd42 3011{
a40e3229
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
a40e3229 3016 list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list)
3e75e2a7 3017 wake_up_interruptible(&stream->read_wait);
a40e3229 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 */
a40e3229 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);
a40e3229
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,
a40e3229
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;
a40e3229 3058 if (session->priv->metadata_cache->data) {
a606b6e8 3059 memcpy(tmp_cache_realloc,
a40e3229
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
a40e3229
MD		 3065 session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size;
3066 session->priv->metadata_cache->data = tmp_cache_realloc;
c099397a 3067 }
a40e3229
MD		 3068 memcpy(session->priv->metadata_cache->data +
3069 session->priv->metadata_cache->metadata_written,
d83004aa 3070 str, len);
a40e3229 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
a40e3229 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
a40e3229 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
a40e3229 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
a40e3229 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{
f0039724 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];
f0039724 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
a40e3229 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
a40e3229 3201int _lttng_variant_type_statedump(struct lttng_kernel_session *session,
437d5aa5 3202 const struct lttng_kernel_type_variant *type,
f0039724
MD		 3203 size_t nesting,
3204 const char *prev_field_name)
65c85aa6 3205{
f0039724 3206 const char *tag_name;
65c85aa6
MD		 3207 int ret;
3208 uint32_t i, nr_choices;
3209
f0039724
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",
f0039724 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];
f0039724 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
a40e3229 3249int _lttng_variant_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3250 const struct lttng_kernel_event_field *field,
f0039724
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,
f0039724
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
a40e3229 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
a40e3229 3319int _lttng_sequence_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3320 const struct lttng_kernel_event_field *field,
f0039724
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;
f0039724
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,
f0039724 3371 length_name);
f513b2bf
MD		 3372 return ret;
3373}
3374
141ddf28
MD		 3375/*
3376 * Must be called with sessions_mutex held.
3377 */
3378static
a40e3229 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
a40e3229 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
a40e3229 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
a40e3229 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
a40e3229 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
a40e3229 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),
f0039724 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
a40e3229 3611int _lttng_field_statedump(struct lttng_kernel_session *session,
437d5aa5 3612 const struct lttng_kernel_event_field *field,
f0039724
MD		 3613 size_t nesting,
3614 const char **prev_field_name_p)
ceabb767 3615{
f0039724 3616 const char *prev_field_name = NULL;
ceabb767 3617 int ret = 0;
27d2368e 3618
f0039724
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:
f0039724 3638 ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name);
f513b2bf 3639 break;
437d5aa5 3640 case lttng_kernel_type_variant:
f0039724 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 }
f0039724
MD		 3648 if (prev_field_name_p)
3649 *prev_field_name_p = field->name;
8070f5c0
MD		 3650 return ret;
3651}
3652
3653static
a40e3229 3654int _lttng_context_metadata_statedump(struct lttng_kernel_session *session,
437d5aa5 3655 struct lttng_kernel_ctx *ctx)
8070f5c0 3656{
f0039724 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
f0039724 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
a40e3229 3674int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session,
a67ba386 3675 struct lttng_kernel_event_recorder *event_recorder)
8070f5c0 3676{
f0039724 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
e69abdfd
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
f0039724 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
a40e3229 3698int _lttng_event_metadata_statedump(struct lttng_kernel_session *session,
ac847066 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;
ac847066 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,
ac847066 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
a40e3229 3755int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session,
ac847066 3756 struct lttng_kernel_channel_buffer *chan)
c099397a
MD		 3757{
3758 int ret = 0;
3759
ac847066 3760 if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3761 return 0;
d83004aa 3762
ac847066 3763 if (chan->priv->channel_type == METADATA_CHANNEL)
c099397a
MD		 3764 return 0;
3765
8b97fd42
MD		 3766 lttng_metadata_begin(session);
3767
ac847066 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",
ac847066
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
ac847066 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 }
ac847066 3786 ret = _lttng_context_metadata_statedump(session, chan->priv->ctx);
8070f5c0
MD		 3787 if (ret)
3788 goto end;
ac847066 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
ac847066 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
a40e3229 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
a40e3229 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
a40e3229 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 */
c570be0d 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
a40e3229 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
a40e3229 3978int _lttng_session_metadata_statedump(struct lttng_kernel_session *session)
c099397a 3979{
a40e3229 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;
ac847066 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
a40e3229 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
a40e3229 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",
a40e3229 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:
ac847066
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
a40e3229 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 }
a40e3229 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
f73c5a43
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{
a40e3229 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();
a40e3229
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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