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Implement capturing payload on event notifier
[lttng-modules.git] / src / lttng-events.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
a90917c3 3 * lttng-events.c
4e3c1b9b 4 *
4e3c1b9b 5 * Holds LTTng per-session event registry.
17baffe2 6 *
886d51a3 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4e3c1b9b
MD		 8 */
9
389d7070
MD		 10/*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14#include "wrapper/page_alloc.h"
15
4e3c1b9b 16#include <linux/module.h>
c0e31d2e
MD		 17#include <linux/mutex.h>
18#include <linux/sched.h>
11b5a3c2 19#include <linux/slab.h>
c099397a 20#include <linux/jiffies.h>
99dc9597 21#include <linux/utsname.h>
abc0446a 22#include <linux/err.h>
7e6f9ef6
MD		 23#include <linux/seq_file.h>
24#include <linux/file.h>
25#include <linux/anon_inodes.h>
241ae9a8 26#include <wrapper/file.h>
8c6e7f13 27#include <linux/uaccess.h>
a606b6e8 28#include <linux/vmalloc.h>
c88f762e 29#include <linux/dmi.h>
3c997079 30
a7008254 31#include <wrapper/uuid.h>
263b6c88 32#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 33#include <wrapper/random.h>
34#include <wrapper/tracepoint.h>
35#include <wrapper/list.h>
cbc19040 36#include <wrapper/types.h>
2df37e95
MD		 37#include <lttng/kernel-version.h>
38#include <lttng/events.h>
0b365677 39#include <lttng/lttng-bytecode.h>
2df37e95 40#include <lttng/tracer.h>
21f58fb7 41#include <lttng/event-notifier-notification.h>
2df37e95
MD		 42#include <lttng/abi-old.h>
43#include <lttng/endian.h>
44#include <lttng/string-utils.h>
4a11ef1c 45#include <lttng/utils.h>
24591303
MD		 46#include <ringbuffer/backend.h>
47#include <ringbuffer/frontend.h>
3636085f 48#include <wrapper/time.h>
4e3c1b9b 49
d83004aa
JD		 50#define METADATA_CACHE_DEFAULT_SIZE 4096
51
4e3c1b9b 52static LIST_HEAD(sessions);
750b05f2 53static LIST_HEAD(event_notifier_groups);
a90917c3 54static LIST_HEAD(lttng_transport_list);
d83004aa
JD		 55/*
56 * Protect the sessions and metadata caches.
57 */
4e3c1b9b
MD		 58static DEFINE_MUTEX(sessions_mutex);
59static struct kmem_cache *event_cache;
dffef45d 60static struct kmem_cache *event_notifier_cache;
4e3c1b9b 61
b2bc0bc8
FD		 62static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
63static void lttng_session_sync_event_enablers(struct lttng_session *session);
64static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
dffef45d 65static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
b01155ba 66static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
3c997079 67
a90917c3 68static void _lttng_event_destroy(struct lttng_event *event);
dffef45d 69static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier);
a90917c3
MD		 70static void _lttng_channel_destroy(struct lttng_channel *chan);
71static int _lttng_event_unregister(struct lttng_event *event);
dffef45d 72static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier);
c099397a 73static
a90917c3
MD		 74int _lttng_event_metadata_statedump(struct lttng_session *session,
75 struct lttng_channel *chan,
76 struct lttng_event *event);
c099397a 77static
a90917c3 78int _lttng_session_metadata_statedump(struct lttng_session *session);
d83004aa
JD		 79static
80void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 81static
ceabb767
MD		 82int _lttng_type_statedump(struct lttng_session *session,
83 const struct lttng_type *type,
84 size_t nesting);
85static
f513b2bf
MD		 86int _lttng_field_statedump(struct lttng_session *session,
87 const struct lttng_event_field *field,
88 size_t nesting);
c099397a 89
c099397a 90void synchronize_trace(void)
abcca994 91{
92da05ce
MJ		 92#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
93 synchronize_rcu();
94#else
abcca994 95 synchronize_sched();
92da05ce
MJ		 96#endif
97
b8590f40
MD		 98#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
99#ifdef CONFIG_PREEMPT_RT_FULL
100 synchronize_rcu();
101#endif
102#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
abcca994
MD		 103#ifdef CONFIG_PREEMPT_RT
104 synchronize_rcu();
105#endif
b8590f40 106#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
abcca994
MD		 107}
108
3c997079
MD		 109void lttng_lock_sessions(void)
110{
111 mutex_lock(&sessions_mutex);
112}
113
114void lttng_unlock_sessions(void)
115{
116 mutex_unlock(&sessions_mutex);
117}
118
9fe593d2
FD		 119static struct lttng_transport *lttng_transport_find(const char *name)
120{
121 struct lttng_transport *transport;
122
123 list_for_each_entry(transport, &lttng_transport_list, node) {
124 if (!strcmp(transport->name, name))
125 return transport;
126 }
127 return NULL;
128}
129
3c997079
MD		 130/*
131 * Called with sessions lock held.
132 */
133int lttng_session_active(void)
134{
135 struct lttng_session *iter;
136
137 list_for_each_entry(iter, &sessions, list) {
138 if (iter->active)
139 return 1;
140 }
141 return 0;
142}
143
a90917c3 144struct lttng_session *lttng_session_create(void)
4e3c1b9b 145{
a90917c3 146 struct lttng_session *session;
d83004aa 147 struct lttng_metadata_cache *metadata_cache;
3c997079 148 int i;
4e3c1b9b
MD		 149
150 mutex_lock(&sessions_mutex);
48f5e0b5 151 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
4e3c1b9b 152 if (!session)
d83004aa 153 goto err;
4e3c1b9b 154 INIT_LIST_HEAD(&session->chan);
f3d01b96 155 INIT_LIST_HEAD(&session->events);
a7008254 156 lttng_guid_gen(&session->uuid);
d83004aa
JD		 157
158 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
159 GFP_KERNEL);
160 if (!metadata_cache)
161 goto err_free_session;
0ca42eb7 162 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 163 if (!metadata_cache->data)
164 goto err_free_cache;
165 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
166 kref_init(&metadata_cache->refcount);
92d9f5e6 167 mutex_init(&metadata_cache->lock);
d83004aa
JD		 168 session->metadata_cache = metadata_cache;
169 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
a36580d5
MD		 170 memcpy(&metadata_cache->uuid, &session->uuid,
171 sizeof(metadata_cache->uuid));
3c997079
MD		 172 INIT_LIST_HEAD(&session->enablers_head);
173 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
174 INIT_HLIST_HEAD(&session->events_ht.table[i]);
4e3c1b9b 175 list_add(&session->list, &sessions);
d1f652f8
MD		 176 session->pid_tracker.session = session;
177 session->pid_tracker.tracker_type = TRACKER_PID;
178 session->vpid_tracker.session = session;
179 session->vpid_tracker.tracker_type = TRACKER_VPID;
180 session->uid_tracker.session = session;
181 session->uid_tracker.tracker_type = TRACKER_UID;
182 session->vuid_tracker.session = session;
183 session->vuid_tracker.tracker_type = TRACKER_VUID;
184 session->gid_tracker.session = session;
185 session->gid_tracker.tracker_type = TRACKER_GID;
186 session->vgid_tracker.session = session;
187 session->vgid_tracker.tracker_type = TRACKER_VGID;
4e3c1b9b
MD		 188 mutex_unlock(&sessions_mutex);
189 return session;
d83004aa
JD		 190
191err_free_cache:
192 kfree(metadata_cache);
193err_free_session:
48f5e0b5 194 lttng_kvfree(session);
d83004aa
JD		 195err:
196 mutex_unlock(&sessions_mutex);
197 return NULL;
198}
199
750b05f2
FD		 200struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
201{
202 struct lttng_transport *transport = NULL;
203 struct lttng_event_notifier_group *event_notifier_group;
204 const char *transport_name = "relay-event-notifier";
205 size_t subbuf_size = 4096; //TODO
206 size_t num_subbuf = 16; //TODO
207 unsigned int switch_timer_interval = 0;
208 unsigned int read_timer_interval = 0;
dffef45d 209 int i;
750b05f2
FD		 210
211 mutex_lock(&sessions_mutex);
212
213 transport = lttng_transport_find(transport_name);
214 if (!transport) {
215 printk(KERN_WARNING "LTTng: transport %s not found\n",
216 transport_name);
217 goto notransport;
218 }
219 if (!try_module_get(transport->owner)) {
220 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
221 transport_name);
222 goto notransport;
223 }
224
225 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
226 GFP_KERNEL);
227 if (!event_notifier_group)
228 goto nomem;
229
230 /*
231 * Initialize the ring buffer used to store event notifier
232 * notifications.
233 */
234 event_notifier_group->ops = &transport->ops;
235 event_notifier_group->chan = transport->ops.channel_create(
236 transport_name, event_notifier_group, NULL,
237 subbuf_size, num_subbuf, switch_timer_interval,
238 read_timer_interval);
239 if (!event_notifier_group->chan)
240 goto create_error;
241
242 event_notifier_group->transport = transport;
dffef45d
FD		 243
244 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
245 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
246 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
247 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
248
750b05f2
FD		 249 list_add(&event_notifier_group->node, &event_notifier_groups);
250
251 mutex_unlock(&sessions_mutex);
252
253 return event_notifier_group;
254
255create_error:
256 lttng_kvfree(event_notifier_group);
257nomem:
258 if (transport)
259 module_put(transport->owner);
260notransport:
261 mutex_unlock(&sessions_mutex);
262 return NULL;
263}
264
d83004aa
JD		 265void metadata_cache_destroy(struct kref *kref)
266{
267 struct lttng_metadata_cache *cache =
268 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 269 vfree(cache->data);
d83004aa 270 kfree(cache);
4e3c1b9b
MD		 271}
272
a90917c3 273void lttng_session_destroy(struct lttng_session *session)
4e3c1b9b 274{
a90917c3
MD		 275 struct lttng_channel *chan, *tmpchan;
276 struct lttng_event *event, *tmpevent;
d83004aa 277 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 278 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 279 int ret;
4e3c1b9b
MD		 280
281 mutex_lock(&sessions_mutex);
a8f2d0c7 282 WRITE_ONCE(session->active, 0);
1ec65de1 283 list_for_each_entry(chan, &session->chan, list) {
2d6d88c6 284 ret = lttng_syscalls_unregister_event(chan);
1ec65de1
MD		 285 WARN_ON(ret);
286 }
dda6a249 287 list_for_each_entry(event, &session->events, list) {
a90917c3 288 ret = _lttng_event_unregister(event);
dda6a249
MD		 289 WARN_ON(ret);
290 }
abcca994 291 synchronize_trace(); /* Wait for in-flight events to complete */
badfe9f5 292 list_for_each_entry(chan, &session->chan, list) {
2d6d88c6 293 ret = lttng_syscalls_destroy_event(chan);
badfe9f5
MD		 294 WARN_ON(ret);
295 }
b2bc0bc8 296 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
3c997079 297 &session->enablers_head, node)
b2bc0bc8 298 lttng_event_enabler_destroy(event_enabler);
4e3c1b9b 299 list_for_each_entry_safe(event, tmpevent, &session->events, list)
a90917c3 300 _lttng_event_destroy(event);
d83004aa
JD		 301 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
302 BUG_ON(chan->channel_type == METADATA_CHANNEL);
a90917c3 303 _lttng_channel_destroy(chan);
d83004aa 304 }
ab036a63 305 mutex_lock(&session->metadata_cache->lock);
d83004aa
JD		 306 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
307 _lttng_metadata_channel_hangup(metadata_stream);
ab036a63 308 mutex_unlock(&session->metadata_cache->lock);
d1f652f8
MD		 309 lttng_id_tracker_destroy(&session->pid_tracker, false);
310 lttng_id_tracker_destroy(&session->vpid_tracker, false);
311 lttng_id_tracker_destroy(&session->uid_tracker, false);
312 lttng_id_tracker_destroy(&session->vuid_tracker, false);
313 lttng_id_tracker_destroy(&session->gid_tracker, false);
314 lttng_id_tracker_destroy(&session->vgid_tracker, false);
d83004aa 315 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
4e3c1b9b
MD		 316 list_del(&session->list);
317 mutex_unlock(&sessions_mutex);
48f5e0b5 318 lttng_kvfree(session);
4e3c1b9b
MD		 319}
320
dffef45d
FD		 321void lttng_event_notifier_group_destroy(
322 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 323{
dffef45d
FD		 324 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
325 struct lttng_event_notifier *event_notifier, *tmpevent_notifier;
326 int ret;
327
750b05f2
FD		 328 if (!event_notifier_group)
329 return;
330
331 mutex_lock(&sessions_mutex);
dffef45d 332
8a8ac9a8
FD		 333 ret = lttng_syscalls_unregister_event_notifier(event_notifier_group);
334 WARN_ON(ret);
335
dffef45d
FD		 336 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
337 &event_notifier_group->event_notifiers_head, list) {
338 ret = _lttng_event_notifier_unregister(event_notifier);
339 WARN_ON(ret);
340 }
341
b01155ba
FD		 342 /* Wait for in-flight event notifier to complete */
343 synchronize_trace();
344
21f58fb7
FD		 345 irq_work_sync(&event_notifier_group->wakeup_pending);
346
8a8ac9a8
FD		 347 kfree(event_notifier_group->sc_filter);
348
dffef45d
FD		 349 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
350 &event_notifier_group->enablers_head, node)
351 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
352
353 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
354 &event_notifier_group->event_notifiers_head, list)
355 _lttng_event_notifier_destroy(event_notifier);
356
750b05f2
FD		 357 event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
358 module_put(event_notifier_group->transport->owner);
359 list_del(&event_notifier_group->node);
dffef45d 360
750b05f2
FD		 361 mutex_unlock(&sessions_mutex);
362 lttng_kvfree(event_notifier_group);
363}
364
601252cf
MD		 365int lttng_session_statedump(struct lttng_session *session)
366{
367 int ret;
368
369 mutex_lock(&sessions_mutex);
370 ret = lttng_statedump_start(session);
371 mutex_unlock(&sessions_mutex);
372 return ret;
373}
374
a90917c3 375int lttng_session_enable(struct lttng_session *session)
c0e31d2e
MD		 376{
377 int ret = 0;
a90917c3 378 struct lttng_channel *chan;
c0e31d2e
MD		 379
380 mutex_lock(&sessions_mutex);
381 if (session->active) {
382 ret = -EBUSY;
383 goto end;
384 }
c099397a 385
3c997079
MD		 386 /* Set transient enabler state to "enabled" */
387 session->tstate = 1;
388
4ef81e4a 389 /* We need to sync enablers with session before activation. */
b2bc0bc8 390 lttng_session_sync_event_enablers(session);
4ef81e4a 391
c099397a
MD		 392 /*
393 * Snapshot the number of events per channel to know the type of header
394 * we need to use.
395 */
396 list_for_each_entry(chan, &session->chan, list) {
397 if (chan->header_type)
398 continue; /* don't change it if session stop/restart */
399 if (chan->free_event_id < 31)
400 chan->header_type = 1; /* compact */
401 else
402 chan->header_type = 2; /* large */
403 }
404
64af2437 405 /* Clear each stream's quiescent state. */
09b93db9
MD		 406 list_for_each_entry(chan, &session->chan, list) {
407 if (chan->channel_type != METADATA_CHANNEL)
408 lib_ring_buffer_clear_quiescent_channel(chan->chan);
409 }
64af2437 410
a8f2d0c7
MJ		 411 WRITE_ONCE(session->active, 1);
412 WRITE_ONCE(session->been_active, 1);
a90917c3 413 ret = _lttng_session_metadata_statedump(session);
c337ddc2 414 if (ret) {
a8f2d0c7 415 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 416 goto end;
417 }
418 ret = lttng_statedump_start(session);
360f38ea 419 if (ret)
a8f2d0c7 420 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 421end:
422 mutex_unlock(&sessions_mutex);
11b5a3c2 423 return ret;
c0e31d2e
MD		 424}
425
a90917c3 426int lttng_session_disable(struct lttng_session *session)
c0e31d2e
MD		 427{
428 int ret = 0;
64af2437 429 struct lttng_channel *chan;
c0e31d2e
MD		 430
431 mutex_lock(&sessions_mutex);
432 if (!session->active) {
433 ret = -EBUSY;
434 goto end;
435 }
a8f2d0c7 436 WRITE_ONCE(session->active, 0);
3c997079
MD		 437
438 /* Set transient enabler state to "disabled" */
439 session->tstate = 0;
b2bc0bc8 440 lttng_session_sync_event_enablers(session);
64af2437
MD		 441
442 /* Set each stream's quiescent state. */
09b93db9
MD		 443 list_for_each_entry(chan, &session->chan, list) {
444 if (chan->channel_type != METADATA_CHANNEL)
445 lib_ring_buffer_set_quiescent_channel(chan->chan);
446 }
c0e31d2e
MD		 447end:
448 mutex_unlock(&sessions_mutex);
11b5a3c2 449 return ret;
c0e31d2e
MD		 450}
451
9616f0bf
JD		 452int lttng_session_metadata_regenerate(struct lttng_session *session)
453{
454 int ret = 0;
455 struct lttng_channel *chan;
456 struct lttng_event *event;
457 struct lttng_metadata_cache *cache = session->metadata_cache;
458 struct lttng_metadata_stream *stream;
459
460 mutex_lock(&sessions_mutex);
461 if (!session->active) {
462 ret = -EBUSY;
463 goto end;
464 }
465
466 mutex_lock(&cache->lock);
467 memset(cache->data, 0, cache->cache_alloc);
468 cache->metadata_written = 0;
469 cache->version++;
470 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
471 stream->metadata_out = 0;
472 stream->metadata_in = 0;
473 }
474 mutex_unlock(&cache->lock);
475
476 session->metadata_dumped = 0;
477 list_for_each_entry(chan, &session->chan, list) {
478 chan->metadata_dumped = 0;
479 }
480
481 list_for_each_entry(event, &session->events, list) {
482 event->metadata_dumped = 0;
483 }
484
485 ret = _lttng_session_metadata_statedump(session);
486
487end:
488 mutex_unlock(&sessions_mutex);
489 return ret;
490}
491
a90917c3 492int lttng_channel_enable(struct lttng_channel *channel)
e64957da 493{
3c997079 494 int ret = 0;
e64957da 495
3c997079
MD		 496 mutex_lock(&sessions_mutex);
497 if (channel->channel_type == METADATA_CHANNEL) {
498 ret = -EPERM;
499 goto end;
500 }
501 if (channel->enabled) {
502 ret = -EEXIST;
503 goto end;
504 }
505 /* Set transient enabler state to "enabled" */
506 channel->tstate = 1;
b2bc0bc8 507 lttng_session_sync_event_enablers(channel->session);
3c997079 508 /* Set atomically the state to "enabled" */
a8f2d0c7 509 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 510end:
511 mutex_unlock(&sessions_mutex);
512 return ret;
e64957da
MD		 513}
514
a90917c3 515int lttng_channel_disable(struct lttng_channel *channel)
e64957da 516{
3c997079 517 int ret = 0;
e64957da 518
3c997079
MD		 519 mutex_lock(&sessions_mutex);
520 if (channel->channel_type == METADATA_CHANNEL) {
521 ret = -EPERM;
522 goto end;
523 }
524 if (!channel->enabled) {
525 ret = -EEXIST;
526 goto end;
527 }
528 /* Set atomically the state to "disabled" */
a8f2d0c7 529 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 530 /* Set transient enabler state to "enabled" */
531 channel->tstate = 0;
b2bc0bc8 532 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 533end:
534 mutex_unlock(&sessions_mutex);
535 return ret;
e64957da
MD		 536}
537
a90917c3 538int lttng_event_enable(struct lttng_event *event)
e64957da 539{
3c997079 540 int ret = 0;
e64957da 541
3c997079
MD		 542 mutex_lock(&sessions_mutex);
543 if (event->chan->channel_type == METADATA_CHANNEL) {
544 ret = -EPERM;
545 goto end;
546 }
547 if (event->enabled) {
548 ret = -EEXIST;
549 goto end;
550 }
a0493bef
MD		 551 switch (event->instrumentation) {
552 case LTTNG_KERNEL_TRACEPOINT:
553 case LTTNG_KERNEL_SYSCALL:
554 ret = -EINVAL;
555 break;
556 case LTTNG_KERNEL_KPROBE:
149b9a9d 557 case LTTNG_KERNEL_UPROBE:
a0493bef 558 case LTTNG_KERNEL_NOOP:
a8f2d0c7 559 WRITE_ONCE(event->enabled, 1);
a0493bef
MD		 560 break;
561 case LTTNG_KERNEL_KRETPROBE:
562 ret = lttng_kretprobes_event_enable_state(event, 1);
563 break;
e884017c 564 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
a0493bef
MD		 565 default:
566 WARN_ON_ONCE(1);
567 ret = -EINVAL;
568 }
3c997079
MD		 569end:
570 mutex_unlock(&sessions_mutex);
571 return ret;
e64957da
MD		 572}
573
a90917c3 574int lttng_event_disable(struct lttng_event *event)
e64957da 575{
3c997079 576 int ret = 0;
e64957da 577
3c997079
MD		 578 mutex_lock(&sessions_mutex);
579 if (event->chan->channel_type == METADATA_CHANNEL) {
580 ret = -EPERM;
581 goto end;
582 }
583 if (!event->enabled) {
584 ret = -EEXIST;
585 goto end;
586 }
a0493bef
MD		 587 switch (event->instrumentation) {
588 case LTTNG_KERNEL_TRACEPOINT:
589 case LTTNG_KERNEL_SYSCALL:
590 ret = -EINVAL;
591 break;
592 case LTTNG_KERNEL_KPROBE:
149b9a9d 593 case LTTNG_KERNEL_UPROBE:
a0493bef 594 case LTTNG_KERNEL_NOOP:
a8f2d0c7 595 WRITE_ONCE(event->enabled, 0);
a0493bef
MD		 596 break;
597 case LTTNG_KERNEL_KRETPROBE:
598 ret = lttng_kretprobes_event_enable_state(event, 0);
599 break;
e884017c 600 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
a0493bef
MD		 601 default:
602 WARN_ON_ONCE(1);
603 ret = -EINVAL;
604 }
3c997079
MD		 605end:
606 mutex_unlock(&sessions_mutex);
607 return ret;
e64957da
MD		 608}
609
dffef45d
FD		 610int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier)
611{
612 int ret = 0;
613
614 mutex_lock(&sessions_mutex);
615 if (event_notifier->enabled) {
616 ret = -EEXIST;
617 goto end;
618 }
619 switch (event_notifier->instrumentation) {
620 case LTTNG_KERNEL_TRACEPOINT:
8a8ac9a8 621 case LTTNG_KERNEL_SYSCALL:
b01155ba
FD		 622 ret = -EINVAL;
623 break;
dffef45d 624 case LTTNG_KERNEL_KPROBE:
9de67196 625 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 626 WRITE_ONCE(event_notifier->enabled, 1);
627 break;
dffef45d 628 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 629 case LTTNG_KERNEL_NOOP:
630 case LTTNG_KERNEL_KRETPROBE:
631 default:
632 WARN_ON_ONCE(1);
633 ret = -EINVAL;
634 }
635end:
636 mutex_unlock(&sessions_mutex);
637 return ret;
638}
639
640int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier)
641{
642 int ret = 0;
643
644 mutex_lock(&sessions_mutex);
645 if (!event_notifier->enabled) {
646 ret = -EEXIST;
647 goto end;
648 }
649 switch (event_notifier->instrumentation) {
650 case LTTNG_KERNEL_TRACEPOINT:
8a8ac9a8 651 case LTTNG_KERNEL_SYSCALL:
b01155ba
FD		 652 ret = -EINVAL;
653 break;
dffef45d 654 case LTTNG_KERNEL_KPROBE:
9de67196 655 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 656 WRITE_ONCE(event_notifier->enabled, 0);
657 break;
dffef45d 658 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 659 case LTTNG_KERNEL_NOOP:
660 case LTTNG_KERNEL_KRETPROBE:
661 default:
662 WARN_ON_ONCE(1);
663 ret = -EINVAL;
664 }
665end:
666 mutex_unlock(&sessions_mutex);
667 return ret;
668}
669
a90917c3 670struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 671 const char *transport_name,
672 void *buf_addr,
4e3c1b9b
MD		 673 size_t subbuf_size, size_t num_subbuf,
674 unsigned int switch_timer_interval,
d83004aa
JD		 675 unsigned int read_timer_interval,
676 enum channel_type channel_type)
4e3c1b9b 677{
a90917c3
MD		 678 struct lttng_channel *chan;
679 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 680
681 mutex_lock(&sessions_mutex);
d83004aa 682 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 683 goto active; /* Refuse to add channel to active session */
a90917c3 684 transport = lttng_transport_find(transport_name);
f3d01b96 685 if (!transport) {
5a15f70c 686 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 687 transport_name);
c0e31d2e 688 goto notransport;
f3d01b96 689 }
a33c9927 690 if (!try_module_get(transport->owner)) {
5a15f70c 691 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 692 goto notransport;
693 }
a90917c3 694 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 695 if (!chan)
c0e31d2e 696 goto nomem;
4e3c1b9b 697 chan->session = session;
05d32c64 698 chan->id = session->free_chan_id++;
3b731ab1 699 chan->ops = &transport->ops;
125b4df4
MD		 700 /*
701 * Note: the channel creation op already writes into the packet
702 * headers. Therefore the "chan" information used as input
703 * should be already accessible.
704 */
5f5ddf01
MD		 705 chan->chan = transport->ops.channel_create(transport_name,
706 chan, buf_addr, subbuf_size, num_subbuf,
707 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 708 if (!chan->chan)
709 goto create_error;
3c997079 710 chan->tstate = 1;
e64957da 711 chan->enabled = 1;
a33c9927 712 chan->transport = transport;
d83004aa 713 chan->channel_type = channel_type;
4e3c1b9b
MD		 714 list_add(&chan->list, &session->chan);
715 mutex_unlock(&sessions_mutex);
716 return chan;
717
f3d01b96
MD		 718create_error:
719 kfree(chan);
c0e31d2e 720nomem:
a33c9927
MD		 721 if (transport)
722 module_put(transport->owner);
c0e31d2e 723notransport:
e5382b6d 724active:
4e3c1b9b
MD		 725 mutex_unlock(&sessions_mutex);
726 return NULL;
727}
728
729/*
d83004aa
JD		 730 * Only used internally at session destruction for per-cpu channels, and
731 * when metadata channel is released.
732 * Needs to be called with sessions mutex held.
4e3c1b9b 733 */
aa7c23a9 734static
a90917c3 735void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 736{
11b5a3c2 737 chan->ops->channel_destroy(chan->chan);
a33c9927 738 module_put(chan->transport->owner);
4e3c1b9b 739 list_del(&chan->list);
8070f5c0 740 lttng_destroy_context(chan->ctx);
4e3c1b9b
MD		 741 kfree(chan);
742}
743
d83004aa
JD		 744void lttng_metadata_channel_destroy(struct lttng_channel *chan)
745{
746 BUG_ON(chan->channel_type != METADATA_CHANNEL);
747
748 /* Protect the metadata cache with the sessions_mutex. */
749 mutex_lock(&sessions_mutex);
750 _lttng_channel_destroy(chan);
751 mutex_unlock(&sessions_mutex);
752}
753EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
754
755static
756void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
757{
758 stream->finalized = 1;
759 wake_up_interruptible(&stream->read_wait);
760}
761
e5382b6d
MD		 762/*
763 * Supports event creation while tracing session is active.
3c997079 764 * Needs to be called with sessions mutex held.
e5382b6d 765 */
3c997079
MD		 766struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
767 struct lttng_kernel_event *event_param,
768 void *filter,
769 const struct lttng_event_desc *event_desc,
770 enum lttng_kernel_instrumentation itype)
4e3c1b9b 771{
3c997079 772 struct lttng_session *session = chan->session;
a90917c3 773 struct lttng_event *event;
3c997079
MD		 774 const char *event_name;
775 struct hlist_head *head;
3d084699 776 int ret;
4e3c1b9b 777
abc0446a 778 if (chan->free_event_id == -1U) {
4cf0bf51 779 ret = -EMFILE;
e5382b6d 780 goto full;
abc0446a 781 }
3c997079
MD		 782
783 switch (itype) {
784 case LTTNG_KERNEL_TRACEPOINT:
785 event_name = event_desc->name;
786 break;
787 case LTTNG_KERNEL_KPROBE:
149b9a9d 788 case LTTNG_KERNEL_UPROBE:
3c997079 789 case LTTNG_KERNEL_KRETPROBE:
3c997079 790 case LTTNG_KERNEL_NOOP:
33a39a3c 791 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 792 event_name = event_param->name;
793 break;
e884017c 794 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
3c997079
MD		 795 default:
796 WARN_ON_ONCE(1);
797 ret = -EINVAL;
798 goto type_error;
799 }
4a11ef1c
FD		 800
801 head = utils_borrow_hash_table_bucket(session->events_ht.table,
802 LTTNG_EVENT_HT_SIZE, event_name);
d216ecae 803 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079
MD		 804 WARN_ON_ONCE(!event->desc);
805 if (!strncmp(event->desc->name, event_name,
806 LTTNG_KERNEL_SYM_NAME_LEN - 1)
807 && chan == event->chan) {
808 ret = -EEXIST;
809 goto exist;
abc0446a
MD		 810 }
811 }
3c997079 812
11b5a3c2 813 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 814 if (!event) {
4cf0bf51 815 ret = -ENOMEM;
4e3c1b9b 816 goto cache_error;
abc0446a 817 }
4e3c1b9b
MD		 818 event->chan = chan;
819 event->filter = filter;
e5382b6d 820 event->id = chan->free_event_id++;
3c997079
MD		 821 event->instrumentation = itype;
822 event->evtype = LTTNG_TYPE_EVENT;
183e8b3a 823 INIT_LIST_HEAD(&event->filter_bytecode_runtime_head);
3c997079
MD		 824 INIT_LIST_HEAD(&event->enablers_ref_head);
825
826 switch (itype) {
ab2277d6 827 case LTTNG_KERNEL_TRACEPOINT:
3c997079
MD		 828 /* Event will be enabled by enabler sync. */
829 event->enabled = 0;
830 event->registered = 0;
0bcedee9 831 event->desc = lttng_event_desc_get(event_name);
abc0446a 832 if (!event->desc) {
4cf0bf51 833 ret = -ENOENT;
d3dbe23c 834 goto register_error;
abc0446a 835 }
3c997079
MD		 836 /* Populate lttng_event structure before event registration. */
837 smp_wmb();
baf20995 838 break;
ab2277d6 839 case LTTNG_KERNEL_KPROBE:
a0493bef
MD		 840 /*
841 * Needs to be explicitly enabled after creation, since
842 * we may want to apply filters.
843 */
844 event->enabled = 0;
3c997079
MD		 845 event->registered = 1;
846 /*
847 * Populate lttng_event structure before event
848 * registration.
849 */
850 smp_wmb();
8bf17deb 851 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 852 event_param->u.kprobe.symbol_name,
853 event_param->u.kprobe.offset,
854 event_param->u.kprobe.addr,
855 event);
abc0446a 856 if (ret) {
4cf0bf51 857 ret = -EINVAL;
d6d808f3 858 goto register_error;
abc0446a 859 }
edeb3137
MD		 860 ret = try_module_get(event->desc->owner);
861 WARN_ON_ONCE(!ret);
d6d808f3 862 break;
7371f44c
MD		 863 case LTTNG_KERNEL_KRETPROBE:
864 {
a90917c3 865 struct lttng_event *event_return;
7371f44c
MD		 866
867 /* kretprobe defines 2 events */
a0493bef
MD		 868 /*
869 * Needs to be explicitly enabled after creation, since
870 * we may want to apply filters.
871 */
872 event->enabled = 0;
3c997079 873 event->registered = 1;
7371f44c
MD		 874 event_return =
875 kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 876 if (!event_return) {
4cf0bf51 877 ret = -ENOMEM;
7371f44c 878 goto register_error;
abc0446a 879 }
7371f44c
MD		 880 event_return->chan = chan;
881 event_return->filter = filter;
882 event_return->id = chan->free_event_id++;
a0493bef 883 event_return->enabled = 0;
3c997079
MD		 884 event_return->registered = 1;
885 event_return->instrumentation = itype;
7371f44c 886 /*
a90917c3 887 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 888 */
889 smp_wmb();
3c997079 890 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 891 event_param->u.kretprobe.symbol_name,
892 event_param->u.kretprobe.offset,
893 event_param->u.kretprobe.addr,
894 event, event_return);
895 if (ret) {
896 kmem_cache_free(event_cache, event_return);
4cf0bf51 897 ret = -EINVAL;
7371f44c
MD		 898 goto register_error;
899 }
900 /* Take 2 refs on the module: one per event. */
901 ret = try_module_get(event->desc->owner);
902 WARN_ON_ONCE(!ret);
903 ret = try_module_get(event->desc->owner);
904 WARN_ON_ONCE(!ret);
a90917c3 905 ret = _lttng_event_metadata_statedump(chan->session, chan,
7371f44c 906 event_return);
abc0446a 907 WARN_ON_ONCE(ret > 0);
7371f44c
MD		 908 if (ret) {
909 kmem_cache_free(event_cache, event_return);
910 module_put(event->desc->owner);
911 module_put(event->desc->owner);
912 goto statedump_error;
913 }
914 list_add(&event_return->list, &chan->session->events);
915 break;
916 }
1ec65de1 917 case LTTNG_KERNEL_NOOP:
33a39a3c 918 case LTTNG_KERNEL_SYSCALL:
a0493bef
MD		 919 /*
920 * Needs to be explicitly enabled after creation, since
921 * we may want to apply filters.
922 */
923 event->enabled = 0;
3c997079
MD		 924 event->registered = 0;
925 event->desc = event_desc;
badfe9f5
MD		 926 switch (event_param->u.syscall.entryexit) {
927 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
928 ret = -EINVAL;
929 goto register_error;
930 case LTTNG_KERNEL_SYSCALL_ENTRY:
931 event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
932 break;
933 case LTTNG_KERNEL_SYSCALL_EXIT:
934 event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
935 break;
936 }
937 switch (event_param->u.syscall.abi) {
938 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
939 ret = -EINVAL;
940 goto register_error;
941 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
942 event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
943 break;
944 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
945 event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
946 break;
947 }
abc0446a 948 if (!event->desc) {
4cf0bf51 949 ret = -EINVAL;
259b6cb3 950 goto register_error;
abc0446a 951 }
1ec65de1 952 break;
149b9a9d 953 case LTTNG_KERNEL_UPROBE:
a344f64b
FD		 954 /*
955 * Needs to be explicitly enabled after creation, since
956 * we may want to apply filters.
957 */
958 event->enabled = 0;
959 event->registered = 1;
3aed4dca 960
a344f64b
FD		 961 /*
962 * Populate lttng_event structure before event
963 * registration.
964 */
965 smp_wmb();
149b9a9d 966
83b802dc 967 ret = lttng_uprobes_register_event(event_param->name,
56377c91 968 event_param->u.uprobe.fd,
149b9a9d
YB		 969 event);
970 if (ret)
971 goto register_error;
972 ret = try_module_get(event->desc->owner);
973 WARN_ON_ONCE(!ret);
974 break;
e884017c 975 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
baf20995
MD		 976 default:
977 WARN_ON_ONCE(1);
4cf0bf51 978 ret = -EINVAL;
df07930b 979 goto register_error;
baf20995 980 }
a90917c3 981 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
abc0446a
MD		 982 WARN_ON_ONCE(ret > 0);
983 if (ret) {
c099397a 984 goto statedump_error;
abc0446a 985 }
3c997079 986 hlist_add_head(&event->hlist, head);
dda6a249 987 list_add(&event->list, &chan->session->events);
4e3c1b9b
MD		 988 return event;
989
c099397a 990statedump_error:
259b6cb3 991 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 992register_error:
11b5a3c2 993 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 994cache_error:
995exist:
3c997079 996type_error:
e5382b6d 997full:
4cf0bf51 998 return ERR_PTR(ret);
4e3c1b9b
MD		 999}
1000
dffef45d
FD		 1001struct lttng_event_notifier *_lttng_event_notifier_create(
1002 const struct lttng_event_desc *event_desc,
1003 uint64_t token, struct lttng_event_notifier_group *event_notifier_group,
1004 struct lttng_kernel_event_notifier *event_notifier_param,
1005 void *filter, enum lttng_kernel_instrumentation itype)
1006{
1007 struct lttng_event_notifier *event_notifier;
1008 const char *event_name;
1009 struct hlist_head *head;
1010 int ret;
1011
1012 switch (itype) {
1013 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1014 event_name = event_desc->name;
1015 break;
dffef45d 1016 case LTTNG_KERNEL_KPROBE:
9de67196 1017 case LTTNG_KERNEL_UPROBE:
8a8ac9a8 1018 case LTTNG_KERNEL_SYSCALL:
2b16f0c9
FD		 1019 event_name = event_notifier_param->event.name;
1020 break;
dffef45d
FD		 1021 case LTTNG_KERNEL_KRETPROBE:
1022 case LTTNG_KERNEL_FUNCTION:
1023 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1024 default:
1025 WARN_ON_ONCE(1);
1026 ret = -EINVAL;
1027 goto type_error;
1028 }
1029
1030 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1031 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
1032 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1033 WARN_ON_ONCE(!event_notifier->desc);
1034 if (!strncmp(event_notifier->desc->name, event_name,
1035 LTTNG_KERNEL_SYM_NAME_LEN - 1)
1036 && event_notifier_group == event_notifier->group
1037 && token == event_notifier->user_token) {
1038 ret = -EEXIST;
1039 goto exist;
1040 }
1041 }
1042
1043 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1044 if (!event_notifier) {
1045 ret = -ENOMEM;
1046 goto cache_error;
1047 }
21f58fb7 1048
dffef45d
FD		 1049 event_notifier->group = event_notifier_group;
1050 event_notifier->user_token = token;
99d223ad 1051 event_notifier->num_captures = 0;
dffef45d
FD		 1052 event_notifier->filter = filter;
1053 event_notifier->instrumentation = itype;
1054 event_notifier->evtype = LTTNG_TYPE_EVENT;
21f58fb7 1055 event_notifier->send_notification = lttng_event_notifier_notification_send;
183e8b3a 1056 INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head);
99d223ad 1057 INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
dffef45d
FD		 1058 INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
1059
1060 switch (itype) {
1061 case LTTNG_KERNEL_TRACEPOINT:
1062 /* Event will be enabled by enabler sync. */
1063 event_notifier->enabled = 0;
1064 event_notifier->registered = 0;
1065 event_notifier->desc = lttng_event_desc_get(event_name);
1066 if (!event_notifier->desc) {
1067 ret = -ENOENT;
1068 goto register_error;
1069 }
1070 /* Populate lttng_event_notifier structure before event registration. */
1071 smp_wmb();
1072 break;
1073 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1074 /*
1075 * Needs to be explicitly enabled after creation, since
1076 * we may want to apply filters.
1077 */
1078 event_notifier->enabled = 0;
1079 event_notifier->registered = 1;
1080 /*
1081 * Populate lttng_event_notifier structure before event
1082 * registration.
1083 */
1084 smp_wmb();
1085 ret = lttng_kprobes_register_event_notifier(
1086 event_notifier_param->event.u.kprobe.symbol_name,
1087 event_notifier_param->event.u.kprobe.offset,
1088 event_notifier_param->event.u.kprobe.addr,
1089 event_notifier);
1090 if (ret) {
1091 ret = -EINVAL;
1092 goto register_error;
1093 }
1094 ret = try_module_get(event_notifier->desc->owner);
1095 WARN_ON_ONCE(!ret);
1096 break;
8a8ac9a8
FD		 1097 case LTTNG_KERNEL_NOOP:
1098 case LTTNG_KERNEL_SYSCALL:
1099 /*
1100 * Needs to be explicitly enabled after creation, since
1101 * we may want to apply filters.
1102 */
1103 event_notifier->enabled = 0;
1104 event_notifier->registered = 0;
1105 event_notifier->desc = event_desc;
1106 switch (event_notifier_param->event.u.syscall.entryexit) {
1107 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1108 ret = -EINVAL;
1109 goto register_error;
1110 case LTTNG_KERNEL_SYSCALL_ENTRY:
1111 event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1112 break;
1113 case LTTNG_KERNEL_SYSCALL_EXIT:
1114 event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1115 break;
1116 }
1117 switch (event_notifier_param->event.u.syscall.abi) {
1118 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1119 ret = -EINVAL;
1120 goto register_error;
1121 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1122 event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1123 break;
1124 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1125 event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1126 break;
1127 }
1128
1129 if (!event_notifier->desc) {
1130 ret = -EINVAL;
1131 goto register_error;
1132 }
1133 break;
dffef45d 1134 case LTTNG_KERNEL_UPROBE:
9de67196
FD		 1135 /*
1136 * Needs to be explicitly enabled after creation, since
1137 * we may want to apply filters.
1138 */
1139 event_notifier->enabled = 0;
1140 event_notifier->registered = 1;
1141
1142 /*
1143 * Populate lttng_event_notifier structure before
1144 * event_notifier registration.
1145 */
1146 smp_wmb();
1147
1148 ret = lttng_uprobes_register_event_notifier(
1149 event_notifier_param->event.name,
1150 event_notifier_param->event.u.uprobe.fd,
1151 event_notifier);
1152 if (ret)
1153 goto register_error;
1154 ret = try_module_get(event_notifier->desc->owner);
1155 WARN_ON_ONCE(!ret);
1156 break;
dffef45d
FD		 1157 case LTTNG_KERNEL_KRETPROBE:
1158 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 1159 default:
1160 WARN_ON_ONCE(1);
1161 ret = -EINVAL;
1162 goto register_error;
1163 }
1164
1165 list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head);
1166 hlist_add_head(&event_notifier->hlist, head);
1167 return event_notifier;
1168
1169register_error:
1170 kmem_cache_free(event_notifier_cache, event_notifier);
1171cache_error:
1172exist:
1173type_error:
1174 return ERR_PTR(ret);
1175}
1176
3c997079
MD		 1177struct lttng_event *lttng_event_create(struct lttng_channel *chan,
1178 struct lttng_kernel_event *event_param,
1179 void *filter,
1180 const struct lttng_event_desc *event_desc,
1181 enum lttng_kernel_instrumentation itype)
1182{
1183 struct lttng_event *event;
1184
1185 mutex_lock(&sessions_mutex);
1186 event = _lttng_event_create(chan, event_param, filter, event_desc,
1187 itype);
1188 mutex_unlock(&sessions_mutex);
1189 return event;
1190}
1191
dffef45d
FD		 1192struct lttng_event_notifier *lttng_event_notifier_create(
1193 const struct lttng_event_desc *event_desc,
1194 uint64_t id, struct lttng_event_notifier_group *event_notifier_group,
1195 struct lttng_kernel_event_notifier *event_notifier_param,
1196 void *filter, enum lttng_kernel_instrumentation itype)
1197{
1198 struct lttng_event_notifier *event_notifier;
1199
1200 mutex_lock(&sessions_mutex);
1201 event_notifier = _lttng_event_notifier_create(event_desc, id,
1202 event_notifier_group, event_notifier_param, filter, itype);
1203 mutex_unlock(&sessions_mutex);
1204 return event_notifier;
1205}
1206
3c997079
MD		 1207/* Only used for tracepoints for now. */
1208static
1209void register_event(struct lttng_event *event)
1210{
1211 const struct lttng_event_desc *desc;
f127e61e 1212 int ret = -EINVAL;
3c997079 1213
3c997079
MD		 1214 if (event->registered)
1215 return;
4ecb5ad5 1216
3c997079 1217 desc = event->desc;
4ecb5ad5
MD		 1218 switch (event->instrumentation) {
1219 case LTTNG_KERNEL_TRACEPOINT:
1220 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1221 desc->probe_callback,
1222 event);
1223 break;
1224 case LTTNG_KERNEL_SYSCALL:
2d6d88c6 1225 ret = lttng_syscall_filter_enable_event(event->chan, event);
4ecb5ad5
MD		 1226 break;
1227 case LTTNG_KERNEL_KPROBE:
a344f64b 1228 case LTTNG_KERNEL_UPROBE:
4ecb5ad5 1229 case LTTNG_KERNEL_KRETPROBE:
4ecb5ad5
MD		 1230 case LTTNG_KERNEL_NOOP:
1231 ret = 0;
1232 break;
e884017c 1233 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
4ecb5ad5
MD		 1234 default:
1235 WARN_ON_ONCE(1);
1236 }
3c997079
MD		 1237 if (!ret)
1238 event->registered = 1;
1239}
1240
4e3c1b9b
MD		 1241/*
1242 * Only used internally at session destruction.
1243 */
a90917c3 1244int _lttng_event_unregister(struct lttng_event *event)
4e3c1b9b 1245{
4ecb5ad5 1246 const struct lttng_event_desc *desc;
11b5a3c2
MD		 1247 int ret = -EINVAL;
1248
3c997079
MD		 1249 if (!event->registered)
1250 return 0;
1251
4ecb5ad5 1252 desc = event->desc;
38d024ae 1253 switch (event->instrumentation) {
ab2277d6 1254 case LTTNG_KERNEL_TRACEPOINT:
20591cf7 1255 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
85a9ca7f 1256 event->desc->probe_callback,
11b5a3c2 1257 event);
baf20995 1258 break;
ab2277d6 1259 case LTTNG_KERNEL_KPROBE:
8bf17deb 1260 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1261 ret = 0;
1262 break;
7371f44c
MD		 1263 case LTTNG_KERNEL_KRETPROBE:
1264 lttng_kretprobes_unregister(event);
1265 ret = 0;
1266 break;
33a39a3c 1267 case LTTNG_KERNEL_SYSCALL:
2d6d88c6 1268 ret = lttng_syscall_filter_disable_event(event->chan, event);
4ecb5ad5
MD		 1269 break;
1270 case LTTNG_KERNEL_NOOP:
259b6cb3
MD		 1271 ret = 0;
1272 break;
149b9a9d 1273 case LTTNG_KERNEL_UPROBE:
83b802dc 1274 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1275 ret = 0;
1276 break;
e884017c 1277 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
baf20995
MD		 1278 default:
1279 WARN_ON_ONCE(1);
1280 }
3c997079
MD		 1281 if (!ret)
1282 event->registered = 0;
dda6a249
MD		 1283 return ret;
1284}
1285
dffef45d
FD		 1286/* Only used for tracepoints for now. */
1287static
b01155ba 1288void register_event_notifier(struct lttng_event_notifier *event_notifier)
dffef45d
FD		 1289{
1290 const struct lttng_event_desc *desc;
1291 int ret = -EINVAL;
1292
1293 if (event_notifier->registered)
1294 return;
1295
1296 desc = event_notifier->desc;
1297 switch (event_notifier->instrumentation) {
1298 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1299 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1300 desc->event_notifier_callback,
1301 event_notifier);
1302 break;
8a8ac9a8
FD		 1303 case LTTNG_KERNEL_SYSCALL:
1304 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1305 break;
dffef45d 1306 case LTTNG_KERNEL_KPROBE:
9de67196 1307 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 1308 ret = 0;
1309 break;
dffef45d
FD		 1310 case LTTNG_KERNEL_KRETPROBE:
1311 case LTTNG_KERNEL_FUNCTION:
1312 case LTTNG_KERNEL_NOOP:
1313 default:
1314 WARN_ON_ONCE(1);
1315 }
1316 if (!ret)
1317 event_notifier->registered = 1;
1318}
1319
1320static
1321int _lttng_event_notifier_unregister(
1322 struct lttng_event_notifier *event_notifier)
1323{
1324 const struct lttng_event_desc *desc;
1325 int ret = -EINVAL;
1326
1327 if (!event_notifier->registered)
1328 return 0;
1329
1330 desc = event_notifier->desc;
1331 switch (event_notifier->instrumentation) {
1332 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1333 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname,
1334 event_notifier->desc->event_notifier_callback,
1335 event_notifier);
1336 break;
dffef45d 1337 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1338 lttng_kprobes_unregister_event_notifier(event_notifier);
1339 ret = 0;
1340 break;
9de67196
FD		 1341 case LTTNG_KERNEL_UPROBE:
1342 lttng_uprobes_unregister_event_notifier(event_notifier);
1343 ret = 0;
1344 break;
8a8ac9a8
FD		 1345 case LTTNG_KERNEL_SYSCALL:
1346 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1347 break;
dffef45d
FD		 1348 case LTTNG_KERNEL_KRETPROBE:
1349 case LTTNG_KERNEL_FUNCTION:
dffef45d 1350 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1351 default:
1352 WARN_ON_ONCE(1);
1353 }
1354 if (!ret)
1355 event_notifier->registered = 0;
1356 return ret;
1357}
1358
dda6a249
MD		 1359/*
1360 * Only used internally at session destruction.
1361 */
be066e6c 1362static
a90917c3 1363void _lttng_event_destroy(struct lttng_event *event)
dda6a249 1364{
edeb3137
MD		 1365 switch (event->instrumentation) {
1366 case LTTNG_KERNEL_TRACEPOINT:
0bcedee9 1367 lttng_event_desc_put(event->desc);
edeb3137
MD		 1368 break;
1369 case LTTNG_KERNEL_KPROBE:
1370 module_put(event->desc->owner);
8bf17deb 1371 lttng_kprobes_destroy_event_private(event);
edeb3137 1372 break;
7371f44c
MD		 1373 case LTTNG_KERNEL_KRETPROBE:
1374 module_put(event->desc->owner);
1375 lttng_kretprobes_destroy_private(event);
1376 break;
259b6cb3 1377 case LTTNG_KERNEL_NOOP:
33a39a3c 1378 case LTTNG_KERNEL_SYSCALL:
259b6cb3 1379 break;
149b9a9d
YB		 1380 case LTTNG_KERNEL_UPROBE:
1381 module_put(event->desc->owner);
83b802dc 1382 lttng_uprobes_destroy_event_private(event);
149b9a9d 1383 break;
e884017c 1384 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
edeb3137
MD		 1385 default:
1386 WARN_ON_ONCE(1);
1387 }
dda6a249 1388 list_del(&event->list);
8070f5c0 1389 lttng_destroy_context(event->ctx);
11b5a3c2 1390 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 1391}
1392
dffef45d
FD		 1393/*
1394 * Only used internally at session destruction.
1395 */
1396static
1397void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
1398{
1399 switch (event_notifier->instrumentation) {
1400 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1401 lttng_event_desc_put(event_notifier->desc);
1402 break;
dffef45d 1403 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1404 module_put(event_notifier->desc->owner);
1405 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1406 break;
8a8ac9a8
FD		 1407 case LTTNG_KERNEL_NOOP:
1408 case LTTNG_KERNEL_SYSCALL:
1409 break;
9de67196
FD		 1410 case LTTNG_KERNEL_UPROBE:
1411 module_put(event_notifier->desc->owner);
1412 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1413 break;
dffef45d
FD		 1414 case LTTNG_KERNEL_KRETPROBE:
1415 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 1416 default:
1417 WARN_ON_ONCE(1);
1418 }
1419 list_del(&event_notifier->list);
1420 kmem_cache_free(event_notifier_cache, event_notifier);
1421}
1422
d1f652f8
MD		 1423struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1424 enum tracker_type tracker_type)
e0130fab 1425{
d1f652f8
MD		 1426 switch (tracker_type) {
1427 case TRACKER_PID:
1428 return &session->pid_tracker;
1429 case TRACKER_VPID:
1430 return &session->vpid_tracker;
1431 case TRACKER_UID:
1432 return &session->uid_tracker;
1433 case TRACKER_VUID:
1434 return &session->vuid_tracker;
1435 case TRACKER_GID:
1436 return &session->gid_tracker;
1437 case TRACKER_VGID:
1438 return &session->vgid_tracker;
1439 default:
1440 WARN_ON_ONCE(1);
1441 return NULL;
1442 }
1443}
1444
1445int lttng_session_track_id(struct lttng_session *session,
1446 enum tracker_type tracker_type, int id)
1447{
1448 struct lttng_id_tracker *tracker;
e0130fab
MD		 1449 int ret;
1450
d1f652f8
MD		 1451 tracker = get_tracker(session, tracker_type);
1452 if (!tracker)
1453 return -EINVAL;
1454 if (id < -1)
e0130fab
MD		 1455 return -EINVAL;
1456 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1457 if (id == -1) {
1458 /* track all ids: destroy tracker. */
1459 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1460 ret = 0;
1461 } else {
d1f652f8 1462 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1463 }
e0130fab
MD		 1464 mutex_unlock(&sessions_mutex);
1465 return ret;
1466}
1467
d1f652f8
MD		 1468int lttng_session_untrack_id(struct lttng_session *session,
1469 enum tracker_type tracker_type, int id)
e0130fab 1470{
d1f652f8 1471 struct lttng_id_tracker *tracker;
e0130fab
MD		 1472 int ret;
1473
d1f652f8
MD		 1474 tracker = get_tracker(session, tracker_type);
1475 if (!tracker)
1476 return -EINVAL;
1477 if (id < -1)
e0130fab
MD		 1478 return -EINVAL;
1479 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1480 if (id == -1) {
1481 /* untrack all ids: replace by empty tracker. */
1482 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1483 } else {
d1f652f8 1484 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1485 }
e0130fab
MD		 1486 mutex_unlock(&sessions_mutex);
1487 return ret;
1488}
1489
7e6f9ef6 1490static
d1f652f8 1491void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1492{
d1f652f8
MD		 1493 struct lttng_id_tracker *id_tracker = m->private;
1494 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1495 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1496 int iter = 0, i;
1497
1498 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1499 if (id_tracker_p) {
1500 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1501 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1502
f934e302 1503 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1504 if (iter++ >= *pos)
1505 return e;
1506 }
1507 }
1508 } else {
d1f652f8 1509 /* ID tracker disabled. */
7e6f9ef6 1510 if (iter >= *pos && iter == 0) {
d1f652f8 1511 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1512 }
1513 iter++;
1514 }
1515 /* End of list */
1516 return NULL;
1517}
1518
1519/* Called with sessions_mutex held. */
1520static
d1f652f8 1521void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1522{
d1f652f8
MD		 1523 struct lttng_id_tracker *id_tracker = m->private;
1524 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1525 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1526 int iter = 0, i;
1527
1528 (*ppos)++;
d1f652f8
MD		 1529 if (id_tracker_p) {
1530 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1531 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1532
f934e302 1533 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1534 if (iter++ >= *ppos)
1535 return e;
1536 }
1537 }
1538 } else {
d1f652f8 1539 /* ID tracker disabled. */
7e6f9ef6 1540 if (iter >= *ppos && iter == 0)
d1f652f8 1541 return p; /* empty tracker */
7e6f9ef6
MD		 1542 iter++;
1543 }
1544
1545 /* End of list */
1546 return NULL;
1547}
1548
1549static
d1f652f8 1550void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1551{
1552 mutex_unlock(&sessions_mutex);
1553}
1554
1555static
d1f652f8 1556int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1557{
d1f652f8
MD		 1558 struct lttng_id_tracker *id_tracker = m->private;
1559 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1560 int id;
7e6f9ef6 1561
d1f652f8 1562 if (p == id_tracker_p) {
7e6f9ef6 1563 /* Tracker disabled. */
d1f652f8 1564 id = -1;
7e6f9ef6 1565 } else {
d1f652f8 1566 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1567
d1f652f8
MD		 1568 id = lttng_id_tracker_get_node_id(e);
1569 }
1570 switch (id_tracker->tracker_type) {
1571 case TRACKER_PID:
1572 seq_printf(m, "process { pid = %d; };\n", id);
1573 break;
1574 case TRACKER_VPID:
1575 seq_printf(m, "process { vpid = %d; };\n", id);
1576 break;
1577 case TRACKER_UID:
1578 seq_printf(m, "user { uid = %d; };\n", id);
1579 break;
1580 case TRACKER_VUID:
1581 seq_printf(m, "user { vuid = %d; };\n", id);
1582 break;
1583 case TRACKER_GID:
1584 seq_printf(m, "group { gid = %d; };\n", id);
1585 break;
1586 case TRACKER_VGID:
1587 seq_printf(m, "group { vgid = %d; };\n", id);
1588 break;
1589 default:
1590 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1591 }
7e6f9ef6
MD		 1592 return 0;
1593}
1594
1595static
d1f652f8
MD		 1596const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1597 .start = id_list_start,
1598 .next = id_list_next,
1599 .stop = id_list_stop,
1600 .show = id_list_show,
7e6f9ef6
MD		 1601};
1602
1603static
d1f652f8 1604int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1605{
d1f652f8 1606 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1607}
1608
1609static
d1f652f8 1610int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1611{
1612 struct seq_file *m = file->private_data;
d1f652f8 1613 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1614 int ret;
1615
d1f652f8 1616 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1617 ret = seq_release(inode, file);
d1f652f8
MD		 1618 if (!ret)
1619 fput(id_tracker->session->file);
7e6f9ef6
MD		 1620 return ret;
1621}
1622
d1f652f8 1623const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1624 .owner = THIS_MODULE,
d1f652f8 1625 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1626 .read = seq_read,
1627 .llseek = seq_lseek,
d1f652f8 1628 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1629};
1630
d1f652f8
MD		 1631int lttng_session_list_tracker_ids(struct lttng_session *session,
1632 enum tracker_type tracker_type)
7e6f9ef6 1633{
d1f652f8 1634 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1635 struct seq_file *m;
1636 int file_fd, ret;
1637
1638 file_fd = lttng_get_unused_fd();
1639 if (file_fd < 0) {
1640 ret = file_fd;
1641 goto fd_error;
1642 }
1643
d1f652f8
MD		 1644 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1645 &lttng_tracker_ids_list_fops,
7e6f9ef6 1646 NULL, O_RDWR);
d1f652f8
MD		 1647 if (IS_ERR(tracker_ids_list_file)) {
1648 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1649 goto file_error;
1650 }
98d7281c
MJ		 1651 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1652 ret = -EOVERFLOW;
9c1f4643
MD		 1653 goto refcount_error;
1654 }
d1f652f8 1655 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1656 if (ret < 0)
1657 goto open_error;
d1f652f8
MD		 1658 m = tracker_ids_list_file->private_data;
1659
1660 m->private = get_tracker(session, tracker_type);
1661 BUG_ON(!m->private);
1662 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1663
1664 return file_fd;
1665
1666open_error:
9c1f4643
MD		 1667 atomic_long_dec(&session->file->f_count);
1668refcount_error:
d1f652f8 1669 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1670file_error:
1671 put_unused_fd(file_fd);
1672fd_error:
1673 return ret;
1674}
1675
3c997079
MD		 1676/*
1677 * Enabler management.
1678 */
1679static
4993071a
PP		 1680int lttng_match_enabler_star_glob(const char *desc_name,
1681 const char *pattern)
3c997079 1682{
cbc19040
MD		 1683 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1684 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1685 return 0;
1686 return 1;
1687}
1688
1689static
4ecb5ad5
MD		 1690int lttng_match_enabler_name(const char *desc_name,
1691 const char *name)
3c997079 1692{
4ecb5ad5 1693 if (strcmp(desc_name, name))
3c997079
MD		 1694 return 0;
1695 return 1;
1696}
1697
3c997079
MD		 1698int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1699 struct lttng_enabler *enabler)
1700{
4ecb5ad5 1701 const char *desc_name, *enabler_name;
badfe9f5 1702 bool compat = false, entry = false;
4ecb5ad5
MD		 1703
1704 enabler_name = enabler->event_param.name;
1705 switch (enabler->event_param.instrumentation) {
1706 case LTTNG_KERNEL_TRACEPOINT:
1707 desc_name = desc->name;
3b861b22
FD		 1708 switch (enabler->format_type) {
1709 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1710 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1711 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1712 return lttng_match_enabler_name(desc_name, enabler_name);
1713 default:
1714 return -EINVAL;
1715 }
4ecb5ad5
MD		 1716 break;
1717 case LTTNG_KERNEL_SYSCALL:
1718 desc_name = desc->name;
badfe9f5 1719 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1720 desc_name += strlen("compat_");
badfe9f5
MD		 1721 compat = true;
1722 }
4ecb5ad5
MD		 1723 if (!strncmp(desc_name, "syscall_exit_",
1724 strlen("syscall_exit_"))) {
1725 desc_name += strlen("syscall_exit_");
1726 } else if (!strncmp(desc_name, "syscall_entry_",
1727 strlen("syscall_entry_"))) {
1728 desc_name += strlen("syscall_entry_");
badfe9f5 1729 entry = true;
4ecb5ad5
MD		 1730 } else {
1731 WARN_ON_ONCE(1);
1732 return -EINVAL;
1733 }
badfe9f5
MD		 1734 switch (enabler->event_param.u.syscall.entryexit) {
1735 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1736 break;
1737 case LTTNG_KERNEL_SYSCALL_ENTRY:
1738 if (!entry)
1739 return 0;
1740 break;
1741 case LTTNG_KERNEL_SYSCALL_EXIT:
1742 if (entry)
1743 return 0;
1744 break;
1745 default:
1746 return -EINVAL;
1747 }
1748 switch (enabler->event_param.u.syscall.abi) {
1749 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1750 break;
1751 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1752 if (compat)
1753 return 0;
1754 break;
1755 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1756 if (!compat)
1757 return 0;
1758 break;
1759 default:
1760 return -EINVAL;
1761 }
1762 switch (enabler->event_param.u.syscall.match) {
cff6938b 1763 case LTTNG_KERNEL_SYSCALL_MATCH_NAME:
3b861b22
FD		 1764 switch (enabler->format_type) {
1765 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1766 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1767 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1768 return lttng_match_enabler_name(desc_name, enabler_name);
1769 default:
1770 return -EINVAL;
1771 }
1772 break;
cff6938b 1773 case LTTNG_KERNEL_SYSCALL_MATCH_NR:
badfe9f5
MD		 1774 return -EINVAL; /* Not implemented. */
1775 default:
1776 return -EINVAL;
1777 }
4ecb5ad5
MD		 1778 break;
1779 default:
1780 WARN_ON_ONCE(1);
1781 return -EINVAL;
1782 }
3c997079
MD		 1783}
1784
1785static
b2bc0bc8
FD		 1786int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
1787 struct lttng_event *event)
3c997079 1788{
b2bc0bc8
FD		 1789 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
1790 event_enabler);
1791
1792 if (base_enabler->event_param.instrumentation != event->instrumentation)
33a39a3c 1793 return 0;
b2bc0bc8
FD		 1794 if (lttng_desc_match_enabler(event->desc, base_enabler)
1795 && event->chan == event_enabler->chan)
3c997079
MD		 1796 return 1;
1797 else
1798 return 0;
1799}
1800
b01155ba
FD		 1801static
1802int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
1803 struct lttng_event_notifier *event_notifier)
1804{
1805 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
1806 event_notifier_enabler);
1807
1808 if (base_enabler->event_param.instrumentation != event_notifier->instrumentation)
1809 return 0;
1810 if (lttng_desc_match_enabler(event_notifier->desc, base_enabler)
1811 && event_notifier->group == event_notifier_enabler->group
1812 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1813 return 1;
1814 else
1815 return 0;
1816}
1817
3c997079 1818static
b2bc0bc8
FD		 1819struct lttng_enabler_ref *lttng_enabler_ref(
1820 struct list_head *enablers_ref_list,
3c997079
MD		 1821 struct lttng_enabler *enabler)
1822{
1823 struct lttng_enabler_ref *enabler_ref;
1824
b2bc0bc8 1825 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 1826 if (enabler_ref->ref == enabler)
1827 return enabler_ref;
1828 }
1829 return NULL;
1830}
1831
3c997079 1832static
1b917d6b 1833void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 1834{
b2bc0bc8 1835 struct lttng_session *session = event_enabler->chan->session;
3c997079
MD		 1836 struct lttng_probe_desc *probe_desc;
1837 const struct lttng_event_desc *desc;
1838 int i;
1839 struct list_head *probe_list;
1840
1841 probe_list = lttng_get_probe_list_head();
1842 /*
1843 * For each probe event, if we find that a probe event matches
1844 * our enabler, create an associated lttng_event if not
1845 * already present.
1846 */
1847 list_for_each_entry(probe_desc, probe_list, head) {
1848 for (i = 0; i < probe_desc->nr_events; i++) {
1849 int found = 0;
1850 struct hlist_head *head;
3c997079
MD		 1851 struct lttng_event *event;
1852
1853 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 1854 if (!lttng_desc_match_enabler(desc,
1855 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 1856 continue;
3c997079
MD		 1857
1858 /*
1859 * Check if already created.
1860 */
4a11ef1c
FD		 1861 head = utils_borrow_hash_table_bucket(
1862 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
1863 desc->name);
d216ecae 1864 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079 1865 if (event->desc == desc
b2bc0bc8 1866 && event->chan == event_enabler->chan)
3c997079
MD		 1867 found = 1;
1868 }
1869 if (found)
1870 continue;
1871
1872 /*
1873 * We need to create an event for this
1874 * event probe.
1875 */
b2bc0bc8 1876 event = _lttng_event_create(event_enabler->chan,
3c997079
MD		 1877 NULL, NULL, desc,
1878 LTTNG_KERNEL_TRACEPOINT);
1879 if (!event) {
5a15f70c 1880 printk(KERN_INFO "LTTng: Unable to create event %s\n",
3c997079
MD		 1881 probe_desc->event_desc[i]->name);
1882 }
1883 }
1884 }
1885}
1886
b01155ba
FD		 1887static
1888void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
1889{
1890 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
1891 struct lttng_probe_desc *probe_desc;
1892 const struct lttng_event_desc *desc;
1893 int i;
1894 struct list_head *probe_list;
1895
1896 probe_list = lttng_get_probe_list_head();
1897 /*
1898 * For each probe event, if we find that a probe event matches
1899 * our enabler, create an associated lttng_event_notifier if not
1900 * already present.
1901 */
1902 list_for_each_entry(probe_desc, probe_list, head) {
1903 for (i = 0; i < probe_desc->nr_events; i++) {
1904 int found = 0;
1905 struct hlist_head *head;
1906 struct lttng_event_notifier *event_notifier;
1907
1908 desc = probe_desc->event_desc[i];
1909 if (!lttng_desc_match_enabler(desc,
1910 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
1911 continue;
1912
1913 /*
1914 * Check if already created.
1915 */
1916 head = utils_borrow_hash_table_bucket(
1917 event_notifier_group->event_notifiers_ht.table,
1918 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
1919 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1920 if (event_notifier->desc == desc
1921 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1922 found = 1;
1923 }
1924 if (found)
1925 continue;
1926
1927 /*
1928 * We need to create a event_notifier for this event probe.
1929 */
1930 event_notifier = _lttng_event_notifier_create(desc,
1931 event_notifier_enabler->base.user_token,
1932 event_notifier_group, NULL, NULL,
1933 LTTNG_KERNEL_TRACEPOINT);
1934 if (IS_ERR(event_notifier)) {
1935 printk(KERN_INFO "Unable to create event_notifier %s\n",
1936 probe_desc->event_desc[i]->name);
1937 }
1938 }
1939 }
1940}
1941
33a39a3c 1942static
1b917d6b 1943void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 1944{
1945 int ret;
1946
2d6d88c6 1947 ret = lttng_syscalls_register_event(event_enabler->chan, NULL);
33a39a3c
MD		 1948 WARN_ON_ONCE(ret);
1949}
1950
8a8ac9a8
FD		 1951static
1952void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
1953{
1954 int ret;
1955
1956 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL);
1957 WARN_ON_ONCE(ret);
1958 ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL);
1959 WARN_ON_ONCE(ret);
1960}
1961
33a39a3c
MD		 1962/*
1963 * Create struct lttng_event if it is missing and present in the list of
1964 * tracepoint probes.
1965 * Should be called with sessions mutex held.
1966 */
1967static
b2bc0bc8 1968void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 1969{
b2bc0bc8 1970 switch (event_enabler->base.event_param.instrumentation) {
33a39a3c 1971 case LTTNG_KERNEL_TRACEPOINT:
1b917d6b 1972 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c
MD		 1973 break;
1974 case LTTNG_KERNEL_SYSCALL:
1b917d6b 1975 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c
MD		 1976 break;
1977 default:
1978 WARN_ON_ONCE(1);
1979 break;
1980 }
1981}
1982
3c997079 1983/*
b2bc0bc8 1984 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 1985 * and add backward reference from the event to the enabler.
1986 * Should be called with sessions mutex held.
1987 */
1988static
b2bc0bc8 1989int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 1990{
b2bc0bc8
FD		 1991 struct lttng_channel *chan = event_enabler->chan;
1992 struct lttng_session *session = event_enabler->chan->session;
1993 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
3c997079
MD		 1994 struct lttng_event *event;
1995
b2bc0bc8
FD		 1996 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
1997 base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT &&
1998 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
cff6938b 1999 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
b2bc0bc8
FD		 2000 !strcmp(base_enabler->event_param.name, "*")) {
2001 if (base_enabler->enabled)
badfe9f5
MD		 2002 WRITE_ONCE(chan->syscall_all, 1);
2003 else
2004 WRITE_ONCE(chan->syscall_all, 0);
2005 }
2006
3c997079 2007 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2008 lttng_create_event_if_missing(event_enabler);
3c997079 2009
b2bc0bc8 2010 /* For each event matching event_enabler in session event list. */
3c997079
MD		 2011 list_for_each_entry(event, &session->events, list) {
2012 struct lttng_enabler_ref *enabler_ref;
2013
b2bc0bc8 2014 if (!lttng_event_enabler_match_event(event_enabler, event))
3c997079 2015 continue;
b2bc0bc8
FD		 2016 enabler_ref = lttng_enabler_ref(&event->enablers_ref_head,
2017 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2018 if (!enabler_ref) {
2019 /*
2020 * If no backward ref, create it.
b2bc0bc8 2021 * Add backward ref from event to event_enabler.
3c997079
MD		 2022 */
2023 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2024 if (!enabler_ref)
2025 return -ENOMEM;
b2bc0bc8 2026 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079
MD		 2027 list_add(&enabler_ref->node,
2028 &event->enablers_ref_head);
2029 }
2030
f127e61e
MD		 2031 /*
2032 * Link filter bytecodes if not linked yet.
2033 */
2dfda770
FD		 2034 lttng_enabler_link_bytecode(event->desc,
2035 lttng_static_ctx,
183e8b3a 2036 &event->filter_bytecode_runtime_head,
60206944 2037 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
f127e61e 2038
3c997079
MD		 2039 /* TODO: merge event context. */
2040 }
2041 return 0;
2042}
2043
b01155ba
FD		 2044/*
2045 * Create struct lttng_event_notifier if it is missing and present in the list of
2046 * tracepoint probes.
2047 * Should be called with sessions mutex held.
2048 */
2049static
2050void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2051{
2052 switch (event_notifier_enabler->base.event_param.instrumentation) {
2053 case LTTNG_KERNEL_TRACEPOINT:
2054 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2055 break;
8a8ac9a8
FD		 2056 case LTTNG_KERNEL_SYSCALL:
2057 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2058 break;
b01155ba
FD		 2059 default:
2060 WARN_ON_ONCE(1);
2061 break;
2062 }
2063}
2064
2065/*
2066 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2067 */
2068static
8a8ac9a8
FD		 2069int lttng_event_notifier_enabler_ref_event_notifiers(
2070 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2071{
2072 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2073 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
b01155ba
FD		 2074 struct lttng_event_notifier *event_notifier;
2075
8a8ac9a8
FD		 2076 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
2077 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
2078 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
2079 !strcmp(base_enabler->event_param.name, "*")) {
2080
2081 int enabled = base_enabler->enabled;
2082 enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2083
2084 if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2085 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2086
2087 if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2088 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2089
2090 }
2091
b01155ba
FD		 2092 /* First ensure that probe event_notifiers are created for this enabler. */
2093 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2094
2095 /* Link the created event_notifier with its associated enabler. */
2096 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2097 struct lttng_enabler_ref *enabler_ref;
2098
2099 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2100 continue;
2101
2102 enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
2103 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2104 if (!enabler_ref) {
2105 /*
2106 * If no backward ref, create it.
2107 * Add backward ref from event_notifier to enabler.
2108 */
2109 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2110 if (!enabler_ref)
2111 return -ENOMEM;
2112
2113 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2114 event_notifier_enabler);
2115 list_add(&enabler_ref->node,
2116 &event_notifier->enablers_ref_head);
2117 }
2118
2119 /*
2120 * Link filter bytecodes if not linked yet.
2121 */
2122 lttng_enabler_link_bytecode(event_notifier->desc,
183e8b3a 2123 lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head,
60206944 2124 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2125
2126 /* Link capture bytecodes if not linked yet. */
2127 lttng_enabler_link_bytecode(event_notifier->desc,
2128 lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head,
2129 &event_notifier_enabler->capture_bytecode_head);
2130
2131 event_notifier->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2132 }
2133 return 0;
2134}
2135
3c997079
MD		 2136/*
2137 * Called at module load: connect the probe on all enablers matching
2138 * this event.
2139 * Called with sessions lock held.
2140 */
2141int lttng_fix_pending_events(void)
2142{
2143 struct lttng_session *session;
2144
2145 list_for_each_entry(session, &sessions, list)
b2bc0bc8 2146 lttng_session_lazy_sync_event_enablers(session);
3c997079
MD		 2147 return 0;
2148}
2149
b01155ba
FD		 2150static bool lttng_event_notifier_group_has_active_event_notifiers(
2151 struct lttng_event_notifier_group *event_notifier_group)
2152{
2153 struct lttng_event_notifier_enabler *event_notifier_enabler;
2154
2155 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2156 node) {
2157 if (event_notifier_enabler->base.enabled)
2158 return true;
2159 }
2160 return false;
2161}
2162
2163bool lttng_event_notifier_active(void)
2164{
2165 struct lttng_event_notifier_group *event_notifier_group;
2166
2167 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2168 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2169 return true;
2170 }
2171 return false;
2172}
2173
2174int lttng_fix_pending_event_notifiers(void)
2175{
2176 struct lttng_event_notifier_group *event_notifier_group;
2177
2178 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2179 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2180 return 0;
2181}
2182
b2bc0bc8
FD		 2183struct lttng_event_enabler *lttng_event_enabler_create(
2184 enum lttng_enabler_format_type format_type,
3c997079
MD		 2185 struct lttng_kernel_event *event_param,
2186 struct lttng_channel *chan)
2187{
b2bc0bc8 2188 struct lttng_event_enabler *event_enabler;
3c997079 2189
b2bc0bc8
FD		 2190 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2191 if (!event_enabler)
3c997079 2192 return NULL;
b2bc0bc8
FD		 2193 event_enabler->base.format_type = format_type;
2194 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2195 memcpy(&event_enabler->base.event_param, event_param,
2196 sizeof(event_enabler->base.event_param));
2197 event_enabler->chan = chan;
3c997079 2198 /* ctx left NULL */
b2bc0bc8
FD		 2199 event_enabler->base.enabled = 0;
2200 event_enabler->base.evtype = LTTNG_TYPE_ENABLER;
3c997079 2201 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2202 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2203 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2204 mutex_unlock(&sessions_mutex);
b2bc0bc8 2205 return event_enabler;
3c997079
MD		 2206}
2207
b2bc0bc8 2208int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2209{
2210 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2211 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2212 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2213 mutex_unlock(&sessions_mutex);
2214 return 0;
2215}
2216
b2bc0bc8 2217int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2218{
2219 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2220 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2221 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2222 mutex_unlock(&sessions_mutex);
2223 return 0;
2224}
2225
b2bc0bc8 2226static
183e8b3a 2227int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
07dfc1d0
MD		 2228 struct lttng_kernel_filter_bytecode __user *bytecode)
2229{
89ec2b91 2230 struct lttng_bytecode_node *bytecode_node;
07dfc1d0
MD		 2231 uint32_t bytecode_len;
2232 int ret;
2233
2234 ret = get_user(bytecode_len, &bytecode->len);
2235 if (ret)
2236 return ret;
52cfcdf3 2237 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2238 GFP_KERNEL);
2239 if (!bytecode_node)
2240 return -ENOMEM;
2241 ret = copy_from_user(&bytecode_node->bc, bytecode,
2242 sizeof(*bytecode) + bytecode_len);
2243 if (ret)
2244 goto error_free;
b2bc0bc8 2245
89ec2b91 2246 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER;
07dfc1d0
MD		 2247 bytecode_node->enabler = enabler;
2248 /* Enforce length based on allocated size */
2249 bytecode_node->bc.len = bytecode_len;
2250 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2251
07dfc1d0
MD		 2252 return 0;
2253
2254error_free:
52cfcdf3 2255 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2256 return ret;
2257}
2258
183e8b3a 2259int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
b2bc0bc8
FD		 2260 struct lttng_kernel_filter_bytecode __user *bytecode)
2261{
2262 int ret;
183e8b3a 2263 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2264 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2265 if (ret)
2266 goto error;
2267
2268 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2269 return 0;
2270
2271error:
2272 return ret;
2273}
2274
3aed4dca
FD		 2275int lttng_event_add_callsite(struct lttng_event *event,
2276 struct lttng_kernel_event_callsite __user *callsite)
2277{
2278
2279 switch (event->instrumentation) {
2280 case LTTNG_KERNEL_UPROBE:
83b802dc 2281 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2282 default:
2283 return -EINVAL;
2284 }
2285}
2286
b2bc0bc8 2287int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler,
3c997079
MD		 2288 struct lttng_kernel_context *context_param)
2289{
2290 return -ENOSYS;
2291}
2292
2293static
2294void lttng_enabler_destroy(struct lttng_enabler *enabler)
2295{
89ec2b91 2296 struct lttng_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2297
2298 /* Destroy filter bytecode */
2299 list_for_each_entry_safe(filter_node, tmp_filter_node,
2300 &enabler->filter_bytecode_head, node) {
52cfcdf3 2301 lttng_kvfree(filter_node);
07dfc1d0 2302 }
b2bc0bc8
FD		 2303}
2304
2305static
2306void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2307{
2308 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2309
3c997079 2310 /* Destroy contexts */
b2bc0bc8 2311 lttng_destroy_context(event_enabler->ctx);
3c997079 2312
b2bc0bc8
FD		 2313 list_del(&event_enabler->node);
2314 kfree(event_enabler);
3c997079
MD		 2315}
2316
dffef45d
FD		 2317struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2318 struct lttng_event_notifier_group *event_notifier_group,
2319 enum lttng_enabler_format_type format_type,
2320 struct lttng_kernel_event_notifier *event_notifier_param)
2321{
2322 struct lttng_event_notifier_enabler *event_notifier_enabler;
2323
2324 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2325 if (!event_notifier_enabler)
2326 return NULL;
2327
2328 event_notifier_enabler->base.format_type = format_type;
2329 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2330 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2331
2332 event_notifier_enabler->num_captures = 0;
dffef45d 2333
8a8ac9a8
FD		 2334 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2335 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2336 event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER;
2337
2338 event_notifier_enabler->base.enabled = 0;
2339 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2340 event_notifier_enabler->group = event_notifier_group;
2341
2342 mutex_lock(&sessions_mutex);
2343 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2344 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2345
2346 mutex_unlock(&sessions_mutex);
2347
2348 return event_notifier_enabler;
2349}
2350
2351int lttng_event_notifier_enabler_enable(
2352 struct lttng_event_notifier_enabler *event_notifier_enabler)
2353{
2354 mutex_lock(&sessions_mutex);
2355 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2356 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2357 mutex_unlock(&sessions_mutex);
2358 return 0;
2359}
2360
2361int lttng_event_notifier_enabler_disable(
2362 struct lttng_event_notifier_enabler *event_notifier_enabler)
2363{
2364 mutex_lock(&sessions_mutex);
2365 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2366 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2367 mutex_unlock(&sessions_mutex);
2368 return 0;
2369}
2370
183e8b3a 2371int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d
FD		 2372 struct lttng_event_notifier_enabler *event_notifier_enabler,
2373 struct lttng_kernel_filter_bytecode __user *bytecode)
2374{
2375 int ret;
2376
183e8b3a 2377 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2378 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2379 bytecode);
2380 if (ret)
2381 goto error;
2382
b01155ba 2383 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2384 return 0;
2385
2386error:
2387 return ret;
2388}
2389
99d223ad
FD		 2390int lttng_event_notifier_enabler_attach_capture_bytecode(
2391 struct lttng_event_notifier_enabler *event_notifier_enabler,
2392 struct lttng_kernel_capture_bytecode __user *bytecode)
2393{
2394 struct lttng_bytecode_node *bytecode_node;
2395 struct lttng_enabler *enabler =
2396 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2397 uint32_t bytecode_len;
2398 int ret;
2399
2400 ret = get_user(bytecode_len, &bytecode->len);
2401 if (ret)
2402 return ret;
2403
2404 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2405 GFP_KERNEL);
2406 if (!bytecode_node)
2407 return -ENOMEM;
2408
2409 ret = copy_from_user(&bytecode_node->bc, bytecode,
2410 sizeof(*bytecode) + bytecode_len);
2411 if (ret)
2412 goto error_free;
2413
2414 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE;
2415 bytecode_node->enabler = enabler;
2416
2417 /* Enforce length based on allocated size */
2418 bytecode_node->bc.len = bytecode_len;
2419 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2420
2421 event_notifier_enabler->num_captures++;
2422
2423 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2424 goto end;
2425
2426error_free:
2427 lttng_kvfree(bytecode_node);
2428end:
2429 return ret;
2430}
2431
9de67196
FD		 2432int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
2433 struct lttng_kernel_event_callsite __user *callsite)
2434{
2435
2436 switch (event_notifier->instrumentation) {
2437 case LTTNG_KERNEL_UPROBE:
2438 return lttng_uprobes_event_notifier_add_callsite(event_notifier,
2439 callsite);
2440 default:
2441 return -EINVAL;
2442 }
2443}
2444
dffef45d
FD		 2445int lttng_event_notifier_enabler_attach_context(
2446 struct lttng_event_notifier_enabler *event_notifier_enabler,
2447 struct lttng_kernel_context *context_param)
2448{
2449 return -ENOSYS;
2450}
2451
2452static
2453void lttng_event_notifier_enabler_destroy(
2454 struct lttng_event_notifier_enabler *event_notifier_enabler)
2455{
2456 if (!event_notifier_enabler) {
2457 return;
2458 }
2459
2460 list_del(&event_notifier_enabler->node);
2461
2462 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2463 kfree(event_notifier_enabler);
2464}
2465
3c997079 2466/*
b2bc0bc8 2467 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2468 * session.
2469 * Should be called with sessions mutex held.
2470 */
2471static
b2bc0bc8 2472void lttng_session_sync_event_enablers(struct lttng_session *session)
3c997079 2473{
b2bc0bc8 2474 struct lttng_event_enabler *event_enabler;
3c997079
MD		 2475 struct lttng_event *event;
2476
b2bc0bc8
FD		 2477 list_for_each_entry(event_enabler, &session->enablers_head, node)
2478 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2479 /*
2480 * For each event, if at least one of its enablers is enabled,
2481 * and its channel and session transient states are enabled, we
2482 * enable the event, else we disable it.
2483 */
2484 list_for_each_entry(event, &session->events, list) {
2485 struct lttng_enabler_ref *enabler_ref;
07dfc1d0
MD		 2486 struct lttng_bytecode_runtime *runtime;
2487 int enabled = 0, has_enablers_without_bytecode = 0;
3c997079 2488
4ecb5ad5
MD		 2489 switch (event->instrumentation) {
2490 case LTTNG_KERNEL_TRACEPOINT:
2491 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 2492 /* Enable events */
2493 list_for_each_entry(enabler_ref,
2494 &event->enablers_ref_head, node) {
2495 if (enabler_ref->ref->enabled) {
2496 enabled = 1;
2497 break;
2498 }
2499 }
4ecb5ad5
MD		 2500 break;
2501 default:
3c997079
MD		 2502 /* Not handled with lazy sync. */
2503 continue;
2504 }
2505 /*
2506 * Enabled state is based on union of enablers, with
2507 * intesection of session and channel transient enable
2508 * states.
2509 */
2510 enabled = enabled && session->tstate && event->chan->tstate;
2511
a8f2d0c7 2512 WRITE_ONCE(event->enabled, enabled);
3c997079
MD		 2513 /*
2514 * Sync tracepoint registration with event enabled
2515 * state.
2516 */
2517 if (enabled) {
2518 register_event(event);
2519 } else {
2520 _lttng_event_unregister(event);
2521 }
07dfc1d0
MD		 2522
2523 /* Check if has enablers without bytecode enabled */
2524 list_for_each_entry(enabler_ref,
2525 &event->enablers_ref_head, node) {
2526 if (enabler_ref->ref->enabled
2527 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2528 has_enablers_without_bytecode = 1;
2529 break;
2530 }
2531 }
2532 event->has_enablers_without_bytecode =
2533 has_enablers_without_bytecode;
2534
2535 /* Enable filters */
2536 list_for_each_entry(runtime,
183e8b3a 2537 &event->filter_bytecode_runtime_head, node)
0b365677 2538 lttng_bytecode_filter_sync_state(runtime);
3c997079
MD		 2539 }
2540}
2541
2542/*
2543 * Apply enablers to session events, adding events to session if need
2544 * be. It is required after each modification applied to an active
2545 * session, and right before session "start".
2546 * "lazy" sync means we only sync if required.
2547 * Should be called with sessions mutex held.
2548 */
2549static
b2bc0bc8 2550void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
3c997079
MD		 2551{
2552 /* We can skip if session is not active */
2553 if (!session->active)
2554 return;
b2bc0bc8 2555 lttng_session_sync_event_enablers(session);
3c997079
MD		 2556}
2557
b01155ba
FD		 2558static
2559void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2560{
2561 struct lttng_event_notifier_enabler *event_notifier_enabler;
2562 struct lttng_event_notifier *event_notifier;
2563
2564 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2565 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2566
2567 /*
2568 * For each event_notifier, if at least one of its enablers is enabled,
2569 * we enable the event_notifier, else we disable it.
2570 */
2571 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2572 struct lttng_enabler_ref *enabler_ref;
2573 struct lttng_bytecode_runtime *runtime;
2574 int enabled = 0, has_enablers_without_bytecode = 0;
2575
2576 switch (event_notifier->instrumentation) {
2577 case LTTNG_KERNEL_TRACEPOINT:
2578 case LTTNG_KERNEL_SYSCALL:
2579 /* Enable event_notifiers */
2580 list_for_each_entry(enabler_ref,
2581 &event_notifier->enablers_ref_head, node) {
2582 if (enabler_ref->ref->enabled) {
2583 enabled = 1;
2584 break;
2585 }
2586 }
2587 break;
2588 default:
2589 /* Not handled with sync. */
2590 continue;
2591 }
2592
2593 WRITE_ONCE(event_notifier->enabled, enabled);
2594 /*
2595 * Sync tracepoint registration with event_notifier enabled
2596 * state.
2597 */
2598 if (enabled) {
2599 if (!event_notifier->registered)
2600 register_event_notifier(event_notifier);
2601 } else {
2602 if (event_notifier->registered)
2603 _lttng_event_notifier_unregister(event_notifier);
2604 }
2605
2606 /* Check if has enablers without bytecode enabled */
2607 list_for_each_entry(enabler_ref,
2608 &event_notifier->enablers_ref_head, node) {
2609 if (enabler_ref->ref->enabled
2610 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2611 has_enablers_without_bytecode = 1;
2612 break;
2613 }
2614 }
2615 event_notifier->has_enablers_without_bytecode =
2616 has_enablers_without_bytecode;
2617
2618 /* Enable filters */
2619 list_for_each_entry(runtime,
183e8b3a 2620 &event_notifier->filter_bytecode_runtime_head, node)
0b365677 2621 lttng_bytecode_filter_sync_state(runtime);
99d223ad
FD		 2622
2623 /* Enable captures */
2624 list_for_each_entry(runtime,
2625 &event_notifier->capture_bytecode_runtime_head, node)
2626 lttng_bytecode_capture_sync_state(runtime);
b01155ba
FD		 2627 }
2628}
2629
1ec3f75a 2630/*
d83004aa
JD		 2631 * Serialize at most one packet worth of metadata into a metadata
2632 * channel.
92d9f5e6
MD		 2633 * We grab the metadata cache mutex to get exclusive access to our metadata
2634 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2635 * allows us to do racy operations such as looking for remaining space left in
2636 * packet and write, since mutual exclusion protects us from concurrent writes.
2637 * Mutual exclusion on the metadata cache allow us to read the cache content
2638 * without racing against reallocation of the cache by updates.
35097f36
JD		 2639 * Returns the number of bytes written in the channel, 0 if no data
2640 * was written and a negative value on error.
1ec3f75a 2641 */
b3b8072b 2642int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2643 struct channel *chan, bool *coherent)
d83004aa
JD		 2644{
2645 struct lib_ring_buffer_ctx ctx;
2646 int ret = 0;
2647 size_t len, reserve_len;
2648
f613e3e6 2649 /*
92d9f5e6
MD		 2650 * Ensure we support mutiple get_next / put sequences followed by
2651 * put_next. The metadata cache lock protects reading the metadata
2652 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2653 * "flush" operations on the buffer invoked by different processes.
2654 * Moreover, since the metadata cache memory can be reallocated, we
2655 * need to have exclusive access against updates even though we only
2656 * read it.
f613e3e6 2657 */
92d9f5e6 2658 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2659 WARN_ON(stream->metadata_in < stream->metadata_out);
2660 if (stream->metadata_in != stream->metadata_out)
de23d59d 2661 goto end;
f613e3e6 2662
9616f0bf
JD		 2663 /* Metadata regenerated, change the version. */
2664 if (stream->metadata_cache->version != stream->version)
2665 stream->version = stream->metadata_cache->version;
2666
d83004aa 2667 len = stream->metadata_cache->metadata_written -
f613e3e6 2668 stream->metadata_in;
9de2c215 2669 if (!len)
de23d59d 2670 goto end;
d83004aa 2671 reserve_len = min_t(size_t,
b3b8072b 2672 stream->transport->ops.packet_avail_size(chan),
d83004aa 2673 len);
b3b8072b 2674 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
d83004aa
JD		 2675 sizeof(char), -1);
2676 /*
2677 * If reservation failed, return an error to the caller.
2678 */
b3b8072b 2679 ret = stream->transport->ops.event_reserve(&ctx, 0);
d83004aa
JD		 2680 if (ret != 0) {
2681 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2682 stream->coherent = false;
d83004aa
JD		 2683 goto end;
2684 }
b3b8072b 2685 stream->transport->ops.event_write(&ctx,
f613e3e6 2686 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2687 reserve_len);
b3b8072b 2688 stream->transport->ops.event_commit(&ctx);
f613e3e6 2689 stream->metadata_in += reserve_len;
3e75e2a7 2690 if (reserve_len < len)
8b97fd42
MD		 2691 stream->coherent = false;
2692 else
2693 stream->coherent = true;
d83004aa
JD		 2694 ret = reserve_len;
2695
2696end:
8b97fd42
MD		 2697 if (coherent)
2698 *coherent = stream->coherent;
92d9f5e6 2699 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2700 return ret;
2701}
2702
8b97fd42
MD		 2703static
2704void lttng_metadata_begin(struct lttng_session *session)
2705{
3e75e2a7
MD		 2706 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2707 mutex_lock(&session->metadata_cache->lock);
8b97fd42
MD		 2708}
2709
2710static
2711void lttng_metadata_end(struct lttng_session *session)
2712{
3e75e2a7
MD		 2713 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2714 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2715 struct lttng_metadata_stream *stream;
2716
3e75e2a7
MD		 2717 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2718 wake_up_interruptible(&stream->read_wait);
92143b2c 2719 mutex_unlock(&session->metadata_cache->lock);
3e75e2a7 2720 }
8b97fd42
MD		 2721}
2722
d83004aa
JD		 2723/*
2724 * Write the metadata to the metadata cache.
2725 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2726 * The metadata cache lock protects us from concurrent read access from
2727 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2728 * The content of the printf is printed as a single atomic metadata
2729 * transaction.
d83004aa 2730 */
a90917c3 2731int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 2732 const char *fmt, ...)
2733{
c099397a 2734 char *str;
d83004aa 2735 size_t len;
c099397a
MD		 2736 va_list ap;
2737
585e5dcc 2738 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2739
2740 va_start(ap, fmt);
2741 str = kvasprintf(GFP_KERNEL, fmt, ap);
2742 va_end(ap);
2743 if (!str)
2744 return -ENOMEM;
2745
1ec3f75a 2746 len = strlen(str);
3e75e2a7 2747 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 2748 if (session->metadata_cache->metadata_written + len >
2749 session->metadata_cache->cache_alloc) {
2750 char *tmp_cache_realloc;
2751 unsigned int tmp_cache_alloc_size;
2752
2753 tmp_cache_alloc_size = max_t(unsigned int,
2754 session->metadata_cache->cache_alloc + len,
2755 session->metadata_cache->cache_alloc << 1);
0ca42eb7 2756 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2757 if (!tmp_cache_realloc)
2758 goto err;
a606b6e8
ML		 2759 if (session->metadata_cache->data) {
2760 memcpy(tmp_cache_realloc,
2761 session->metadata_cache->data,
2762 session->metadata_cache->cache_alloc);
2763 vfree(session->metadata_cache->data);
2764 }
2765
d83004aa
JD		 2766 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2767 session->metadata_cache->data = tmp_cache_realloc;
c099397a 2768 }
d83004aa
JD		 2769 memcpy(session->metadata_cache->data +
2770 session->metadata_cache->metadata_written,
2771 str, len);
2772 session->metadata_cache->metadata_written += len;
c099397a 2773 kfree(str);
d83004aa 2774
d83004aa
JD		 2775 return 0;
2776
2777err:
2778 kfree(str);
2779 return -ENOMEM;
c099397a
MD		 2780}
2781
f513b2bf
MD		 2782static
2783int print_tabs(struct lttng_session *session, size_t nesting)
2784{
2785 size_t i;
2786
2787 for (i = 0; i < nesting; i++) {
2788 int ret;
2789
2790 ret = lttng_metadata_printf(session, " ");
2791 if (ret) {
2792 return ret;
2793 }
2794 }
2795 return 0;
2796}
2797
ceabb767
MD		 2798static
2799int lttng_field_name_statedump(struct lttng_session *session,
2800 const struct lttng_event_field *field,
2801 size_t nesting)
2802{
2803 return lttng_metadata_printf(session, " _%s;\n", field->name);
2804}
2805
2806static
2807int _lttng_integer_type_statedump(struct lttng_session *session,
2808 const struct lttng_type *type,
2809 size_t nesting)
2810{
2811 int ret;
2812
2813 WARN_ON_ONCE(type->atype != atype_integer);
2814 ret = print_tabs(session, nesting);
2815 if (ret)
2816 return ret;
2817 ret = lttng_metadata_printf(session,
2818 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2819 type->u.integer.size,
2820 type->u.integer.alignment,
2821 type->u.integer.signedness,
2822 (type->u.integer.encoding == lttng_encode_none)
2823 ? "none"
2824 : (type->u.integer.encoding == lttng_encode_UTF8)
2825 ? "UTF8"
2826 : "ASCII",
2827 type->u.integer.base,
2828#if __BYTE_ORDER == __BIG_ENDIAN
2829 type->u.integer.reverse_byte_order ? " byte_order = le;" : ""
2830#else
2831 type->u.integer.reverse_byte_order ? " byte_order = be;" : ""
2832#endif
2833 );
2834 return ret;
2835}
2836
f513b2bf
MD		 2837/*
2838 * Must be called with sessions_mutex held.
2839 */
2840static
2841int _lttng_struct_type_statedump(struct lttng_session *session,
2842 const struct lttng_type *type,
2843 size_t nesting)
2844{
2845 int ret;
2846 uint32_t i, nr_fields;
ceabb767
MD		 2847 unsigned int alignment;
2848
2849 WARN_ON_ONCE(type->atype != atype_struct_nestable);
f513b2bf
MD		 2850
2851 ret = print_tabs(session, nesting);
2852 if (ret)
2853 return ret;
2854 ret = lttng_metadata_printf(session,
2855 "struct {\n");
2856 if (ret)
2857 return ret;
ceabb767 2858 nr_fields = type->u.struct_nestable.nr_fields;
f513b2bf
MD		 2859 for (i = 0; i < nr_fields; i++) {
2860 const struct lttng_event_field *iter_field;
2861
ceabb767 2862 iter_field = &type->u.struct_nestable.fields[i];
f513b2bf
MD		 2863 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2864 if (ret)
2865 return ret;
2866 }
2867 ret = print_tabs(session, nesting);
2868 if (ret)
2869 return ret;
ceabb767
MD		 2870 alignment = type->u.struct_nestable.alignment;
2871 if (alignment) {
2872 ret = lttng_metadata_printf(session,
2873 "} align(%u)",
2874 alignment);
2875 } else {
2876 ret = lttng_metadata_printf(session,
2877 "}");
2878 }
f513b2bf
MD		 2879 return ret;
2880}
2881
2882/*
2883 * Must be called with sessions_mutex held.
2884 */
2885static
ceabb767 2886int _lttng_struct_field_statedump(struct lttng_session *session,
f513b2bf
MD		 2887 const struct lttng_event_field *field,
2888 size_t nesting)
2889{
2890 int ret;
2891
2892 ret = _lttng_struct_type_statedump(session,
2893 &field->type, nesting);
2894 if (ret)
2895 return ret;
ceabb767 2896 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 2897}
2898
65c85aa6
MD		 2899/*
2900 * Must be called with sessions_mutex held.
2901 */
2902static
2903int _lttng_variant_type_statedump(struct lttng_session *session,
2904 const struct lttng_type *type,
2905 size_t nesting)
2906{
2907 int ret;
2908 uint32_t i, nr_choices;
2909
ceabb767
MD		 2910 WARN_ON_ONCE(type->atype != atype_variant_nestable);
2911 /*
2912 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2913 */
2914 if (type->u.variant_nestable.alignment != 0)
2915 return -EINVAL;
65c85aa6
MD		 2916 ret = print_tabs(session, nesting);
2917 if (ret)
2918 return ret;
2919 ret = lttng_metadata_printf(session,
2920 "variant <_%s> {\n",
ceabb767 2921 type->u.variant_nestable.tag_name);
65c85aa6
MD		 2922 if (ret)
2923 return ret;
ceabb767 2924 nr_choices = type->u.variant_nestable.nr_choices;
65c85aa6
MD		 2925 for (i = 0; i < nr_choices; i++) {
2926 const struct lttng_event_field *iter_field;
2927
ceabb767 2928 iter_field = &type->u.variant_nestable.choices[i];
65c85aa6
MD		 2929 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2930 if (ret)
2931 return ret;
2932 }
2933 ret = print_tabs(session, nesting);
2934 if (ret)
2935 return ret;
2936 ret = lttng_metadata_printf(session,
2937 "}");
2938 return ret;
2939}
2940
2941/*
2942 * Must be called with sessions_mutex held.
2943 */
2944static
ceabb767 2945int _lttng_variant_field_statedump(struct lttng_session *session,
65c85aa6
MD		 2946 const struct lttng_event_field *field,
2947 size_t nesting)
2948{
2949 int ret;
2950
2951 ret = _lttng_variant_type_statedump(session,
2952 &field->type, nesting);
2953 if (ret)
2954 return ret;
ceabb767 2955 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 2956}
2957
f513b2bf
MD		 2958/*
2959 * Must be called with sessions_mutex held.
2960 */
2961static
ceabb767 2962int _lttng_array_field_statedump(struct lttng_session *session,
f513b2bf
MD		 2963 const struct lttng_event_field *field,
2964 size_t nesting)
2965{
2966 int ret;
2967 const struct lttng_type *elem_type;
2968
ceabb767
MD		 2969 WARN_ON_ONCE(field->type.atype != atype_array_nestable);
2970
2971 if (field->type.u.array_nestable.alignment) {
2972 ret = print_tabs(session, nesting);
f513b2bf
MD		 2973 if (ret)
2974 return ret;
ceabb767
MD		 2975 ret = lttng_metadata_printf(session,
2976 "struct { } align(%u) _%s_padding;\n",
2977 field->type.u.array_nestable.alignment * CHAR_BIT,
2978 field->name);
2979 if (ret)
2980 return ret;
2981 }
2982 /*
2983 * Nested compound types: Only array of structures and variants are
2984 * currently supported.
2985 */
2986 elem_type = field->type.u.array_nestable.elem_type;
2987 switch (elem_type->atype) {
2988 case atype_integer:
2989 case atype_struct_nestable:
2990 case atype_variant_nestable:
2991 ret = _lttng_type_statedump(session, elem_type, nesting);
65c85aa6
MD		 2992 if (ret)
2993 return ret;
2994 break;
ceabb767 2995
f513b2bf
MD		 2996 default:
2997 return -EINVAL;
2998 }
2999 ret = lttng_metadata_printf(session,
3000 " _%s[%u];\n",
3001 field->name,
ceabb767 3002 field->type.u.array_nestable.length);
f513b2bf
MD		 3003 return ret;
3004}
3005
3006/*
3007 * Must be called with sessions_mutex held.
3008 */
3009static
ceabb767 3010int _lttng_sequence_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3011 const struct lttng_event_field *field,
3012 size_t nesting)
3013{
3014 int ret;
3015 const char *length_name;
3016 const struct lttng_type *elem_type;
3017
ceabb767 3018 WARN_ON_ONCE(field->type.atype != atype_sequence_nestable);
f513b2bf 3019
ceabb767
MD		 3020 length_name = field->type.u.sequence_nestable.length_name;
3021
3022 if (field->type.u.sequence_nestable.alignment) {
3023 ret = print_tabs(session, nesting);
f513b2bf
MD		 3024 if (ret)
3025 return ret;
ceabb767
MD		 3026 ret = lttng_metadata_printf(session,
3027 "struct { } align(%u) _%s_padding;\n",
3028 field->type.u.sequence_nestable.alignment * CHAR_BIT,
3029 field->name);
3030 if (ret)
3031 return ret;
3032 }
3033
3034 /*
3035 * Nested compound types: Only array of structures and variants are
3036 * currently supported.
3037 */
3038 elem_type = field->type.u.sequence_nestable.elem_type;
3039 switch (elem_type->atype) {
3040 case atype_integer:
3041 case atype_struct_nestable:
3042 case atype_variant_nestable:
3043 ret = _lttng_type_statedump(session, elem_type, nesting);
65c85aa6
MD		 3044 if (ret)
3045 return ret;
3046 break;
ceabb767 3047
f513b2bf
MD		 3048 default:
3049 return -EINVAL;
3050 }
3051 ret = lttng_metadata_printf(session,
3052 " _%s[ _%s ];\n",
3053 field->name,
ceabb767 3054 field->type.u.sequence_nestable.length_name);
f513b2bf
MD		 3055 return ret;
3056}
3057
141ddf28
MD		 3058/*
3059 * Must be called with sessions_mutex held.
3060 */
3061static
ceabb767
MD		 3062int _lttng_enum_type_statedump(struct lttng_session *session,
3063 const struct lttng_type *type,
141ddf28
MD		 3064 size_t nesting)
3065{
3066 const struct lttng_enum_desc *enum_desc;
ceabb767 3067 const struct lttng_type *container_type;
141ddf28
MD		 3068 int ret;
3069 unsigned int i, nr_entries;
3070
ceabb767
MD		 3071 container_type = type->u.enum_nestable.container_type;
3072 if (container_type->atype != atype_integer) {
3073 ret = -EINVAL;
3074 goto end;
3075 }
3076 enum_desc = type->u.enum_nestable.desc;
141ddf28
MD		 3077 nr_entries = enum_desc->nr_entries;
3078
3079 ret = print_tabs(session, nesting);
3080 if (ret)
3081 goto end;
ceabb767
MD		 3082 ret = lttng_metadata_printf(session, "enum : ");
3083 if (ret)
3084 goto end;
3085 ret = _lttng_integer_type_statedump(session, container_type, 0);
141ddf28 3086 if (ret)
ceabb767
MD		 3087 goto end;
3088 ret = lttng_metadata_printf(session, " {\n");
3089 if (ret)
3090 goto end;
141ddf28
MD		 3091 /* Dump all entries */
3092 for (i = 0; i < nr_entries; i++) {
3093 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
3094 int j, len;
3095
3096 ret = print_tabs(session, nesting + 1);
3097 if (ret)
3098 goto end;
3099 ret = lttng_metadata_printf(session,
3100 "\"");
3101 if (ret)
3102 goto end;
3103 len = strlen(entry->string);
3104 /* Escape the character '"' */
3105 for (j = 0; j < len; j++) {
3106 char c = entry->string[j];
3107
3108 switch (c) {
3109 case '"':
3110 ret = lttng_metadata_printf(session,
3111 "\\\"");
3112 break;
3113 case '\\':
3114 ret = lttng_metadata_printf(session,
3115 "\\\\");
3116 break;
3117 default:
3118 ret = lttng_metadata_printf(session,
3119 "%c", c);
3120 break;
3121 }
3122 if (ret)
3123 goto end;
3124 }
08ad1061
PP		 3125 ret = lttng_metadata_printf(session, "\"");
3126 if (ret)
3127 goto end;
3128
3129 if (entry->options.is_auto) {
3130 ret = lttng_metadata_printf(session, ",\n");
3131 if (ret)
3132 goto end;
141ddf28 3133 } else {
7c559490
MD		 3134 ret = lttng_metadata_printf(session,
3135 " = ");
3136 if (ret)
3137 goto end;
3138 if (entry->start.signedness)
141ddf28 3139 ret = lttng_metadata_printf(session,
7c559490
MD		 3140 "%lld", (long long) entry->start.value);
3141 else
3142 ret = lttng_metadata_printf(session,
3143 "%llu", entry->start.value);
3144 if (ret)
3145 goto end;
3146 if (entry->start.signedness == entry->end.signedness &&
3147 entry->start.value
3148 == entry->end.value) {
141ddf28 3149 ret = lttng_metadata_printf(session,
7c559490
MD		 3150 ",\n");
3151 } else {
3152 if (entry->end.signedness) {
3153 ret = lttng_metadata_printf(session,
3154 " ... %lld,\n",
3155 (long long) entry->end.value);
3156 } else {
3157 ret = lttng_metadata_printf(session,
3158 " ... %llu,\n",
3159 entry->end.value);
3160 }
141ddf28 3161 }
7c559490
MD		 3162 if (ret)
3163 goto end;
141ddf28 3164 }
141ddf28
MD		 3165 }
3166 ret = print_tabs(session, nesting);
3167 if (ret)
3168 goto end;
ceabb767 3169 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3170end:
3171 return ret;
3172}
3173
d83004aa
JD		 3174/*
3175 * Must be called with sessions_mutex held.
3176 */
c099397a 3177static
ceabb767
MD		 3178int _lttng_enum_field_statedump(struct lttng_session *session,
3179 const struct lttng_event_field *field,
3180 size_t nesting)
3181{
3182 int ret;
3183
3184 ret = _lttng_enum_type_statedump(session, &field->type, nesting);
3185 if (ret)
3186 return ret;
3187 return lttng_field_name_statedump(session, field, nesting);
3188}
3189
3190static
3191int _lttng_integer_field_statedump(struct lttng_session *session,
3192 const struct lttng_event_field *field,
3193 size_t nesting)
3194{
3195 int ret;
3196
3197 ret = _lttng_integer_type_statedump(session, &field->type, nesting);
3198 if (ret)
3199 return ret;
3200 return lttng_field_name_statedump(session, field, nesting);
3201}
3202
3203static
3204int _lttng_string_type_statedump(struct lttng_session *session,
3205 const struct lttng_type *type,
3206 size_t nesting)
3207{
3208 int ret;
3209
3210 WARN_ON_ONCE(type->atype != atype_string);
3211 /* Default encoding is UTF8 */
3212 ret = print_tabs(session, nesting);
3213 if (ret)
3214 return ret;
3215 ret = lttng_metadata_printf(session,
3216 "string%s",
3217 type->u.string.encoding == lttng_encode_ASCII ?
3218 " { encoding = ASCII; }" : "");
3219 return ret;
3220}
3221
3222static
3223int _lttng_string_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3224 const struct lttng_event_field *field,
3225 size_t nesting)
ceabb767
MD		 3226{
3227 int ret;
3228
3229 WARN_ON_ONCE(field->type.atype != atype_string);
3230 ret = _lttng_string_type_statedump(session, &field->type, nesting);
3231 if (ret)
3232 return ret;
3233 return lttng_field_name_statedump(session, field, nesting);
3234}
3235
3236/*
3237 * Must be called with sessions_mutex held.
3238 */
3239static
3240int _lttng_type_statedump(struct lttng_session *session,
3241 const struct lttng_type *type,
3242 size_t nesting)
c099397a 3243{
c099397a 3244 int ret = 0;
c099397a 3245
ceabb767 3246 switch (type->atype) {
8070f5c0 3247 case atype_integer:
ceabb767 3248 ret = _lttng_integer_type_statedump(session, type, nesting);
8070f5c0 3249 break;
ceabb767
MD		 3250 case atype_enum_nestable:
3251 ret = _lttng_enum_type_statedump(session, type, nesting);
8070f5c0 3252 break;
ceabb767
MD		 3253 case atype_string:
3254 ret = _lttng_string_type_statedump(session, type, nesting);
3255 break;
3256 case atype_struct_nestable:
3257 ret = _lttng_struct_type_statedump(session, type, nesting);
8070f5c0 3258 break;
ceabb767
MD		 3259 case atype_variant_nestable:
3260 ret = _lttng_variant_type_statedump(session, type, nesting);
3261 break;
3262
3263 /* Nested arrays and sequences are not supported yet. */
3264 case atype_array_nestable:
3265 case atype_sequence_nestable:
3266 default:
3267 WARN_ON_ONCE(1);
3268 return -EINVAL;
8070f5c0 3269 }
ceabb767
MD		 3270 return ret;
3271}
8070f5c0 3272
ceabb767
MD		 3273/*
3274 * Must be called with sessions_mutex held.
3275 */
3276static
3277int _lttng_field_statedump(struct lttng_session *session,
3278 const struct lttng_event_field *field,
3279 size_t nesting)
3280{
3281 int ret = 0;
27d2368e 3282
ceabb767
MD		 3283 switch (field->type.atype) {
3284 case atype_integer:
3285 ret = _lttng_integer_field_statedump(session, field, nesting);
3286 break;
3287 case atype_enum_nestable:
3288 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3289 break;
8070f5c0 3290 case atype_string:
ceabb767 3291 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3292 break;
ceabb767
MD		 3293 case atype_struct_nestable:
3294 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3295 break;
ceabb767
MD		 3296 case atype_array_nestable:
3297 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3298 break;
ceabb767
MD		 3299 case atype_sequence_nestable:
3300 ret = _lttng_sequence_field_statedump(session, field, nesting);
f513b2bf 3301 break;
ceabb767
MD		 3302 case atype_variant_nestable:
3303 ret = _lttng_variant_field_statedump(session, field, nesting);
65c85aa6 3304 break;
f513b2bf 3305
8070f5c0
MD		 3306 default:
3307 WARN_ON_ONCE(1);
3308 return -EINVAL;
3309 }
3310 return ret;
3311}
3312
3313static
a90917c3 3314int _lttng_context_metadata_statedump(struct lttng_session *session,
8070f5c0
MD		 3315 struct lttng_ctx *ctx)
3316{
3317 int ret = 0;
3318 int i;
3319
3320 if (!ctx)
3321 return 0;
3322 for (i = 0; i < ctx->nr_fields; i++) {
3323 const struct lttng_ctx_field *field = &ctx->fields[i];
3324
f513b2bf 3325 ret = _lttng_field_statedump(session, &field->event_field, 2);
8070f5c0
MD		 3326 if (ret)
3327 return ret;
3328 }
3329 return ret;
3330}
3331
3332static
a90917c3
MD		 3333int _lttng_fields_metadata_statedump(struct lttng_session *session,
3334 struct lttng_event *event)
8070f5c0
MD		 3335{
3336 const struct lttng_event_desc *desc = event->desc;
3337 int ret = 0;
3338 int i;
3339
3340 for (i = 0; i < desc->nr_fields; i++) {
3341 const struct lttng_event_field *field = &desc->fields[i];
3342
f513b2bf 3343 ret = _lttng_field_statedump(session, field, 2);
8070f5c0
MD		 3344 if (ret)
3345 return ret;
c099397a
MD		 3346 }
3347 return ret;
3348}
3349
d83004aa
JD		 3350/*
3351 * Must be called with sessions_mutex held.
8b97fd42
MD		 3352 * The entire event metadata is printed as a single atomic metadata
3353 * transaction.
d83004aa 3354 */
c099397a 3355static
a90917c3
MD		 3356int _lttng_event_metadata_statedump(struct lttng_session *session,
3357 struct lttng_channel *chan,
3358 struct lttng_event *event)
c099397a
MD		 3359{
3360 int ret = 0;
3361
585e5dcc 3362 if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3363 return 0;
d83004aa 3364 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3365 return 0;
3366
8b97fd42
MD		 3367 lttng_metadata_begin(session);
3368
c099397a
MD		 3369 ret = lttng_metadata_printf(session,
3370 "event {\n"
ae734547 3371 " name = \"%s\";\n"
c099397a 3372 " id = %u;\n"
b9074a1b 3373 " stream_id = %u;\n",
c099397a
MD		 3374 event->desc->name,
3375 event->id,
3376 event->chan->id);
3377 if (ret)
3378 goto end;
3379
b9074a1b
MD		 3380 if (event->ctx) {
3381 ret = lttng_metadata_printf(session,
3382 " context := struct {\n");
3383 if (ret)
3384 goto end;
3385 }
a90917c3 3386 ret = _lttng_context_metadata_statedump(session, event->ctx);
8070f5c0
MD		 3387 if (ret)
3388 goto end;
b9074a1b
MD		 3389 if (event->ctx) {
3390 ret = lttng_metadata_printf(session,
3391 " };\n");
3392 if (ret)
3393 goto end;
3394 }
8070f5c0
MD		 3395
3396 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3397 " fields := struct {\n"
3398 );
3399 if (ret)
3400 goto end;
3401
a90917c3 3402 ret = _lttng_fields_metadata_statedump(session, event);
c099397a
MD		 3403 if (ret)
3404 goto end;
3405
3406 /*
3407 * LTTng space reservation can only reserve multiples of the
3408 * byte size.
3409 */
3410 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3411 " };\n"
3412 "};\n\n");
c099397a
MD		 3413 if (ret)
3414 goto end;
3415
c099397a
MD		 3416 event->metadata_dumped = 1;
3417end:
8b97fd42 3418 lttng_metadata_end(session);
c099397a
MD		 3419 return ret;
3420
3421}
3422
d83004aa
JD		 3423/*
3424 * Must be called with sessions_mutex held.
8b97fd42
MD		 3425 * The entire channel metadata is printed as a single atomic metadata
3426 * transaction.
d83004aa 3427 */
c099397a 3428static
a90917c3
MD		 3429int _lttng_channel_metadata_statedump(struct lttng_session *session,
3430 struct lttng_channel *chan)
c099397a
MD		 3431{
3432 int ret = 0;
3433
585e5dcc 3434 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3435 return 0;
d83004aa
JD		 3436
3437 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3438 return 0;
3439
8b97fd42
MD		 3440 lttng_metadata_begin(session);
3441
c099397a
MD		 3442 WARN_ON_ONCE(!chan->header_type);
3443 ret = lttng_metadata_printf(session,
3444 "stream {\n"
3445 " id = %u;\n"
9115fbdc 3446 " event.header := %s;\n"
b9074a1b 3447 " packet.context := struct packet_context;\n",
c099397a
MD		 3448 chan->id,
3449 chan->header_type == 1 ? "struct event_header_compact" :
3450 "struct event_header_large");
3451 if (ret)
3452 goto end;
3453
b9074a1b
MD		 3454 if (chan->ctx) {
3455 ret = lttng_metadata_printf(session,
3456 " event.context := struct {\n");
3457 if (ret)
3458 goto end;
3459 }
a90917c3 3460 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 3461 if (ret)
3462 goto end;
b9074a1b
MD		 3463 if (chan->ctx) {
3464 ret = lttng_metadata_printf(session,
3465 " };\n");
3466 if (ret)
3467 goto end;
3468 }
8070f5c0
MD		 3469
3470 ret = lttng_metadata_printf(session,
b9074a1b 3471 "};\n\n");
8070f5c0 3472
c099397a
MD		 3473 chan->metadata_dumped = 1;
3474end:
8b97fd42 3475 lttng_metadata_end(session);
c099397a
MD		 3476 return ret;
3477}
3478
d83004aa
JD		 3479/*
3480 * Must be called with sessions_mutex held.
3481 */
9115fbdc 3482static
a90917c3 3483int _lttng_stream_packet_context_declare(struct lttng_session *session)
9115fbdc
MD		 3484{
3485 return lttng_metadata_printf(session,
3486 "struct packet_context {\n"
a3ccff4f
MD		 3487 " uint64_clock_monotonic_t timestamp_begin;\n"
3488 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3489 " uint64_t content_size;\n"
3490 " uint64_t packet_size;\n"
5b3cf4f9 3491 " uint64_t packet_seq_num;\n"
a9afe705 3492 " unsigned long events_discarded;\n"
9115fbdc 3493 " uint32_t cpu_id;\n"
c6dfdf6f 3494 "};\n\n"
9115fbdc
MD		 3495 );
3496}
3497
3498/*
3499 * Compact header:
3500 * id: range: 0 - 30.
3501 * id 31 is reserved to indicate an extended header.
3502 *
3503 * Large header:
3504 * id: range: 0 - 65534.
3505 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3506 *
3507 * Must be called with sessions_mutex held.
9115fbdc
MD		 3508 */
3509static
a90917c3 3510int _lttng_event_header_declare(struct lttng_session *session)
9115fbdc
MD		 3511{
3512 return lttng_metadata_printf(session,
3513 "struct event_header_compact {\n"
3514 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3515 " variant <id> {\n"
3516 " struct {\n"
a3ccff4f 3517 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3518 " } compact;\n"
3519 " struct {\n"
3520 " uint32_t id;\n"
a3ccff4f 3521 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3522 " } extended;\n"
3523 " } v;\n"
3524 "} align(%u);\n"
3525 "\n"
3526 "struct event_header_large {\n"
3527 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3528 " variant <id> {\n"
3529 " struct {\n"
a3ccff4f 3530 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3531 " } compact;\n"
3532 " struct {\n"
3533 " uint32_t id;\n"
a3ccff4f 3534 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3535 " } extended;\n"
3536 " } v;\n"
3537 "} align(%u);\n\n",
a90917c3
MD		 3538 lttng_alignof(uint32_t) * CHAR_BIT,
3539 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3540 );
3541}
3542
a3ccff4f
MD		 3543 /*
3544 * Approximation of NTP time of day to clock monotonic correlation,
3545 * taken at start of trace.
3546 * Yes, this is only an approximation. Yes, we can (and will) do better
3547 * in future versions.
5283350b
MD		 3548 * This function may return a negative offset. It may happen if the
3549 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3550 *
3551 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3552 * y2038 compliant.
a3ccff4f
MD		 3553 */
3554static
8967b2a3 3555int64_t measure_clock_offset(void)
a3ccff4f 3556{
dcb93448 3557 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3558 uint64_t tcf = trace_clock_freq();
dcb93448 3559 int64_t offset;
a3ccff4f 3560 unsigned long flags;
3636085f
MJ		 3561#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3562 struct timespec64 rts = { 0, 0 };
3563#else
3564 struct timespec rts = { 0, 0 };
3565#endif
a3ccff4f
MD		 3566
3567 /* Disable interrupts to increase correlation precision. */
3568 local_irq_save(flags);
3569 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3570#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3571 ktime_get_real_ts64(&rts);
3572#else
216b6baa 3573 getnstimeofday(&rts);
3636085f 3574#endif
a3ccff4f
MD		 3575 monotonic[1] = trace_clock_read64();
3576 local_irq_restore(flags);
3577
dcb93448 3578 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3579 realtime = (uint64_t) rts.tv_sec * tcf;
3580 if (tcf == NSEC_PER_SEC) {
3581 realtime += rts.tv_nsec;
3582 } else {
3583 uint64_t n = rts.tv_nsec * tcf;
3584
3585 do_div(n, NSEC_PER_SEC);
3586 realtime += n;
3587 }
dcb93448 3588 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3589 return offset;
3590}
3591
3eb95be4
JR		 3592static
3593int print_escaped_ctf_string(struct lttng_session *session, const char *string)
3594{
0f3eaad4 3595 int ret = 0;
3eb95be4
JR		 3596 size_t i;
3597 char cur;
3598
3599 i = 0;
3600 cur = string[i];
3601 while (cur != '\0') {
3602 switch (cur) {
3603 case '\n':
3604 ret = lttng_metadata_printf(session, "%s", "\\n");
3605 break;
3606 case '\\':
3607 case '"':
3608 ret = lttng_metadata_printf(session, "%c", '\\');
3609 if (ret)
3610 goto error;
3611 /* We still print the current char */
3612 /* Fallthrough */
3613 default:
3614 ret = lttng_metadata_printf(session, "%c", cur);
3615 break;
3616 }
3617
3618 if (ret)
3619 goto error;
3620
3621 cur = string[++i];
3622 }
3623error:
3624 return ret;
3625}
3626
3627static
1c88f269
JR		 3628int print_metadata_escaped_field(struct lttng_session *session, const char *field,
3629 const char *field_value)
3eb95be4
JR		 3630{
3631 int ret;
3632
1c88f269 3633 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3634 if (ret)
3635 goto error;
3636
1c88f269 3637 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3638 if (ret)
3639 goto error;
3640
3641 ret = lttng_metadata_printf(session, "\";\n");
3642
3643error:
3644 return ret;
3645}
3646
c099397a
MD		 3647/*
3648 * Output metadata into this session's metadata buffers.
d83004aa 3649 * Must be called with sessions_mutex held.
c099397a
MD		 3650 */
3651static
a90917c3 3652int _lttng_session_metadata_statedump(struct lttng_session *session)
c099397a 3653{
30bdb6e4 3654 unsigned char *uuid_c = session->uuid.b;
a82c63f1 3655 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3656 const char *product_uuid;
a90917c3
MD		 3657 struct lttng_channel *chan;
3658 struct lttng_event *event;
c099397a
MD		 3659 int ret = 0;
3660
585e5dcc 3661 if (!LTTNG_READ_ONCE(session->active))
c099397a 3662 return 0;
8b97fd42
MD		 3663
3664 lttng_metadata_begin(session);
3665
c099397a
MD		 3666 if (session->metadata_dumped)
3667 goto skip_session;
c099397a 3668
d793d5e1 3669 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3670 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3671 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3672 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3673 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3674 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3675
3676 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3677 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3678 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3679 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3680 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3681 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3682 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3683 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3684 "\n"
3685 "trace {\n"
3686 " major = %u;\n"
3687 " minor = %u;\n"
30bdb6e4 3688 " uuid = \"%s\";\n"
d793d5e1
MD		 3689 " byte_order = %s;\n"
3690 " packet.header := struct {\n"
3691 " uint32_t magic;\n"
1ec3f75a 3692 " uint8_t uuid[16];\n"
d793d5e1 3693 " uint32_t stream_id;\n"
5594698f 3694 " uint64_t stream_instance_id;\n"
0eb25f58 3695 " };\n"
d793d5e1 3696 "};\n\n",
a90917c3
MD		 3697 lttng_alignof(uint8_t) * CHAR_BIT,
3698 lttng_alignof(uint16_t) * CHAR_BIT,
3699 lttng_alignof(uint32_t) * CHAR_BIT,
3700 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3701 sizeof(unsigned long) * CHAR_BIT,
3702 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3703 CTF_SPEC_MAJOR,
3704 CTF_SPEC_MINOR,
d793d5e1 3705 uuid_s,
5214fa50 3706#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3707 "be"
3708#else
3709 "le"
3710#endif
3711 );
3712 if (ret)
3713 goto end;
3714
99dc9597
MD		 3715 ret = lttng_metadata_printf(session,
3716 "env {\n"
a6058143 3717 " hostname = \"%s\";\n"
c6c9e10f 3718 " domain = \"kernel\";\n"
99dc9597 3719 " sysname = \"%s\";\n"
c6c9e10f
MD		 3720 " kernel_release = \"%s\";\n"
3721 " kernel_version = \"%s\";\n"
3722 " tracer_name = \"lttng-modules\";\n"
3723 " tracer_major = %d;\n"
3724 " tracer_minor = %d;\n"
3725 " tracer_patchlevel = %d;\n"
3eb95be4 3726 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3727 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3728 utsname()->sysname,
3729 utsname()->release,
c6c9e10f
MD		 3730 utsname()->version,
3731 LTTNG_MODULES_MAJOR_VERSION,
3732 LTTNG_MODULES_MINOR_VERSION,
3733 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3734 );
3735 if (ret)
3736 goto end;
3737
1c88f269
JR		 3738 ret = print_metadata_escaped_field(session, "trace_name", session->name);
3739 if (ret)
3740 goto end;
3741 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
3742 session->creation_time);
3eb95be4
JR		 3743 if (ret)
3744 goto end;
3745
c88f762e
GB		 3746 /* Add the product UUID to the 'env' section */
3747 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3748 if (product_uuid) {
3749 ret = lttng_metadata_printf(session,
3750 " product_uuid = \"%s\";\n",
3751 product_uuid
3752 );
3753 if (ret)
3754 goto end;
3755 }
3756
3757 /* Close the 'env' section */
3eb95be4
JR		 3758 ret = lttng_metadata_printf(session, "};\n\n");
3759 if (ret)
3760 goto end;
3761
a3ccff4f
MD		 3762 ret = lttng_metadata_printf(session,
3763 "clock {\n"
2754583e
MD		 3764 " name = \"%s\";\n",
3765 trace_clock_name()
a82c63f1
MD		 3766 );
3767 if (ret)
3768 goto end;
3769
3770 if (!trace_clock_uuid(clock_uuid_s)) {
3771 ret = lttng_metadata_printf(session,
7c27cb17 3772 " uuid = \"%s\";\n",
a82c63f1
MD		 3773 clock_uuid_s
3774 );
3775 if (ret)
3776 goto end;
3777 }
3778
3779 ret = lttng_metadata_printf(session,
2754583e 3780 " description = \"%s\";\n"
a3ccff4f
MD		 3781 " freq = %llu; /* Frequency, in Hz */\n"
3782 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 3783 " offset = %lld;\n"
a3ccff4f 3784 "};\n\n",
2754583e 3785 trace_clock_description(),
a3ccff4f 3786 (unsigned long long) trace_clock_freq(),
8967b2a3 3787 (long long) measure_clock_offset()
a3ccff4f
MD		 3788 );
3789 if (ret)
3790 goto end;
3791
3792 ret = lttng_metadata_printf(session,
3793 "typealias integer {\n"
3794 " size = 27; align = 1; signed = false;\n"
2754583e 3795 " map = clock.%s.value;\n"
a3ccff4f
MD		 3796 "} := uint27_clock_monotonic_t;\n"
3797 "\n"
3798 "typealias integer {\n"
3799 " size = 32; align = %u; signed = false;\n"
2754583e 3800 " map = clock.%s.value;\n"
a3ccff4f
MD		 3801 "} := uint32_clock_monotonic_t;\n"
3802 "\n"
3803 "typealias integer {\n"
3804 " size = 64; align = %u; signed = false;\n"
2754583e 3805 " map = clock.%s.value;\n"
a3ccff4f 3806 "} := uint64_clock_monotonic_t;\n\n",
2754583e 3807 trace_clock_name(),
a3ccff4f 3808 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 3809 trace_clock_name(),
3810 lttng_alignof(uint64_t) * CHAR_BIT,
3811 trace_clock_name()
a3ccff4f
MD		 3812 );
3813 if (ret)
3814 goto end;
3815
a90917c3 3816 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 3817 if (ret)
3818 goto end;
3819
a90917c3 3820 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 3821 if (ret)
3822 goto end;
3823
c099397a
MD		 3824skip_session:
3825 list_for_each_entry(chan, &session->chan, list) {
a90917c3 3826 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 3827 if (ret)
3828 goto end;
3829 }
3830
3831 list_for_each_entry(event, &session->events, list) {
a90917c3 3832 ret = _lttng_event_metadata_statedump(session, event->chan, event);
c099397a
MD		 3833 if (ret)
3834 goto end;
3835 }
3836 session->metadata_dumped = 1;
3837end:
8b97fd42 3838 lttng_metadata_end(session);
c099397a
MD		 3839 return ret;
3840}
3841
c0e31d2e 3842/**
a90917c3 3843 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 3844 * @transport: transport structure
3845 *
3846 * Registers a transport which can be used as output to extract the data out of
3847 * LTTng. The module calling this registration function must ensure that no
3848 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 3849 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 3850 * is made visible to the transport function. This registration acts as a
263b6c88 3851 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 3852 * after its registration must it synchronize the TLBs.
3853 */
a90917c3 3854void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 3855{
3856 /*
3857 * Make sure no page fault can be triggered by the module about to be
3858 * registered. We deal with this here so we don't have to call
263b6c88 3859 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 3860 */
263b6c88 3861 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 3862
3863 mutex_lock(&sessions_mutex);
a90917c3 3864 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 3865 mutex_unlock(&sessions_mutex);
3866}
a90917c3 3867EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 3868
3869/**
a90917c3 3870 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 3871 * @transport: transport structure
3872 */
a90917c3 3873void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 3874{
3875 mutex_lock(&sessions_mutex);
3876 list_del(&transport->node);
3877 mutex_unlock(&sessions_mutex);
3878}
a90917c3 3879EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 3880
894ce5dc 3881#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
1e367326
MD		 3882
3883enum cpuhp_state lttng_hp_prepare;
3884enum cpuhp_state lttng_hp_online;
3885
3886static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
3887{
3888 struct lttng_cpuhp_node *lttng_node;
3889
3890 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3891 switch (lttng_node->component) {
3892 case LTTNG_RING_BUFFER_FRONTEND:
3893 return 0;
3894 case LTTNG_RING_BUFFER_BACKEND:
3895 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
3896 case LTTNG_RING_BUFFER_ITER:
3897 return 0;
3898 case LTTNG_CONTEXT_PERF_COUNTERS:
3899 return 0;
3900 default:
3901 return -EINVAL;
3902 }
3903}
3904
3905static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
3906{
3907 struct lttng_cpuhp_node *lttng_node;
3908
3909 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3910 switch (lttng_node->component) {
3911 case LTTNG_RING_BUFFER_FRONTEND:
3912 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
3913 case LTTNG_RING_BUFFER_BACKEND:
3914 return 0;
3915 case LTTNG_RING_BUFFER_ITER:
3916 return 0;
3917 case LTTNG_CONTEXT_PERF_COUNTERS:
3918 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
3919 default:
3920 return -EINVAL;
3921 }
3922}
3923
3924static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
3925{
3926 struct lttng_cpuhp_node *lttng_node;
3927
3928 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3929 switch (lttng_node->component) {
3930 case LTTNG_RING_BUFFER_FRONTEND:
3931 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
3932 case LTTNG_RING_BUFFER_BACKEND:
3933 return 0;
3934 case LTTNG_RING_BUFFER_ITER:
3935 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
3936 case LTTNG_CONTEXT_PERF_COUNTERS:
3937 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
3938 default:
3939 return -EINVAL;
3940 }
3941}
3942
3943static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
3944{
3945 struct lttng_cpuhp_node *lttng_node;
3946
3947 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3948 switch (lttng_node->component) {
3949 case LTTNG_RING_BUFFER_FRONTEND:
3950 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
3951 case LTTNG_RING_BUFFER_BACKEND:
3952 return 0;
3953 case LTTNG_RING_BUFFER_ITER:
3954 return 0;
3955 case LTTNG_CONTEXT_PERF_COUNTERS:
3956 return 0;
3957 default:
3958 return -EINVAL;
3959 }
3960}
3961
3962static int __init lttng_init_cpu_hotplug(void)
3963{
3964 int ret;
3965
3966 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
3967 lttng_hotplug_prepare,
3968 lttng_hotplug_dead);
3969 if (ret < 0) {
3970 return ret;
3971 }
3972 lttng_hp_prepare = ret;
3973 lttng_rb_set_hp_prepare(ret);
3974
3975 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
3976 lttng_hotplug_online,
3977 lttng_hotplug_offline);
3978 if (ret < 0) {
3979 cpuhp_remove_multi_state(lttng_hp_prepare);
3980 lttng_hp_prepare = 0;
3981 return ret;
3982 }
3983 lttng_hp_online = ret;
3984 lttng_rb_set_hp_online(ret);
3985
3986 return 0;
3987}
3988
3989static void __exit lttng_exit_cpu_hotplug(void)
3990{
3991 lttng_rb_set_hp_online(0);
3992 cpuhp_remove_multi_state(lttng_hp_online);
3993 lttng_rb_set_hp_prepare(0);
3994 cpuhp_remove_multi_state(lttng_hp_prepare);
3995}
3996
1ee63d8d 3997#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
1e367326
MD		 3998static int lttng_init_cpu_hotplug(void)
3999{
4000 return 0;
4001}
4002static void lttng_exit_cpu_hotplug(void)
4003{
4004}
1ee63d8d 4005#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4006
4007
a90917c3 4008static int __init lttng_events_init(void)
4e3c1b9b 4009{
1c25284c
MD		 4010 int ret;
4011
453b2495
JD		 4012 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4013 if (ret)
4014 return ret;
389d7070 4015 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4016 if (ret)
4017 return ret;
4018 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4019 if (ret)
4020 return ret;
4021 ret = lttng_probes_init();
389d7070
MD		 4022 if (ret)
4023 return ret;
07dfc1d0 4024 ret = lttng_context_init();
20591cf7
MD		 4025 if (ret)
4026 return ret;
07dfc1d0
MD		 4027 ret = lttng_tracepoint_init();
4028 if (ret)
4029 goto error_tp;
a90917c3 4030 event_cache = KMEM_CACHE(lttng_event, 0);
20591cf7
MD		 4031 if (!event_cache) {
4032 ret = -ENOMEM;
dffef45d
FD		 4033 goto error_kmem_event;
4034 }
4035 event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0);
4036 if (!event_notifier_cache) {
4037 ret = -ENOMEM;
4038 goto error_kmem_event_notifier;
20591cf7 4039 }
80996790 4040 ret = lttng_abi_init();
02119ee5
MD		 4041 if (ret)
4042 goto error_abi;
0c956676
MD		 4043 ret = lttng_logger_init();
4044 if (ret)
4045 goto error_logger;
1e367326
MD		 4046 ret = lttng_init_cpu_hotplug();
4047 if (ret)
4048 goto error_hotplug;
101215b7 4049 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4050 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4051 __stringify(LTTNG_MODULES_MINOR_VERSION),
4052 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4053 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4054 LTTNG_VERSION_NAME,
4055#ifdef LTTNG_EXTRA_VERSION_GIT
4056 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4057#else
4058 "",
4059#endif
4060#ifdef LTTNG_EXTRA_VERSION_NAME
4061 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4062#else
4063 "");
4064#endif
4e3c1b9b 4065 return 0;
0c956676 4066
1e367326
MD		 4067error_hotplug:
4068 lttng_logger_exit();
0c956676
MD		 4069error_logger:
4070 lttng_abi_exit();
02119ee5 4071error_abi:
dffef45d
FD		 4072 kmem_cache_destroy(event_notifier_cache);
4073error_kmem_event_notifier:
1c25284c 4074 kmem_cache_destroy(event_cache);
dffef45d 4075error_kmem_event:
20591cf7 4076 lttng_tracepoint_exit();
07dfc1d0
MD		 4077error_tp:
4078 lttng_context_exit();
101215b7 4079 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4080 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4081 __stringify(LTTNG_MODULES_MINOR_VERSION),
4082 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4083 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4084 LTTNG_VERSION_NAME,
4085#ifdef LTTNG_EXTRA_VERSION_GIT
4086 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4087#else
4088 "",
4089#endif
4090#ifdef LTTNG_EXTRA_VERSION_NAME
4091 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4092#else
4093 "");
4094#endif
1c25284c 4095 return ret;
4e3c1b9b
MD		 4096}
4097
a90917c3 4098module_init(lttng_events_init);
11b5a3c2 4099
a90917c3 4100static void __exit lttng_events_exit(void)
4e3c1b9b 4101{
a90917c3 4102 struct lttng_session *session, *tmpsession;
92e94819 4103
1e367326 4104 lttng_exit_cpu_hotplug();
0c956676 4105 lttng_logger_exit();
80996790 4106 lttng_abi_exit();
92e94819 4107 list_for_each_entry_safe(session, tmpsession, &sessions, list)
a90917c3 4108 lttng_session_destroy(session);
11b5a3c2 4109 kmem_cache_destroy(event_cache);
dffef45d 4110 kmem_cache_destroy(event_notifier_cache);
20591cf7 4111 lttng_tracepoint_exit();
07dfc1d0 4112 lttng_context_exit();
101215b7 4113 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4114 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4115 __stringify(LTTNG_MODULES_MINOR_VERSION),
4116 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4117 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4118 LTTNG_VERSION_NAME,
4119#ifdef LTTNG_EXTRA_VERSION_GIT
4120 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4121#else
4122 "",
4123#endif
4124#ifdef LTTNG_EXTRA_VERSION_NAME
4125 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4126#else
4127 "");
4128#endif
4e3c1b9b 4129}
92e94819 4130
a90917c3 4131module_exit(lttng_events_exit);
11b5a3c2 4132
7ca11e77 4133#include <generated/patches.h>
101215b7
MJ		 4134#ifdef LTTNG_EXTRA_VERSION_GIT
4135MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4136#endif
4137#ifdef LTTNG_EXTRA_VERSION_NAME
4138MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4139#endif
92e94819
MD		 4140MODULE_LICENSE("GPL and additional rights");
4141MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4142MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4143MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4144 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4145 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4146 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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