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Namespace kernel version macros
[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);
a101fa10 55static LIST_HEAD(lttng_counter_transport_list);
d83004aa
JD		 56/*
57 * Protect the sessions and metadata caches.
58 */
4e3c1b9b
MD		 59static DEFINE_MUTEX(sessions_mutex);
60static struct kmem_cache *event_cache;
dffef45d 61static struct kmem_cache *event_notifier_cache;
4e3c1b9b 62
b2bc0bc8
FD		 63static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
64static void lttng_session_sync_event_enablers(struct lttng_session *session);
65static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
dffef45d 66static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
b01155ba 67static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
3c997079 68
a90917c3 69static void _lttng_event_destroy(struct lttng_event *event);
dffef45d 70static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier);
a90917c3
MD		 71static void _lttng_channel_destroy(struct lttng_channel *chan);
72static int _lttng_event_unregister(struct lttng_event *event);
dffef45d 73static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier);
c099397a 74static
a90917c3
MD		 75int _lttng_event_metadata_statedump(struct lttng_session *session,
76 struct lttng_channel *chan,
77 struct lttng_event *event);
c099397a 78static
a90917c3 79int _lttng_session_metadata_statedump(struct lttng_session *session);
d83004aa
JD		 80static
81void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf 82static
ceabb767
MD		 83int _lttng_type_statedump(struct lttng_session *session,
84 const struct lttng_type *type,
85 size_t nesting);
86static
f513b2bf
MD		 87int _lttng_field_statedump(struct lttng_session *session,
88 const struct lttng_event_field *field,
89 size_t nesting);
c099397a 90
c099397a 91void synchronize_trace(void)
abcca994 92{
5f4c791e 93#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
92da05ce
MJ		 94 synchronize_rcu();
95#else
abcca994 96 synchronize_sched();
92da05ce
MJ		 97#endif
98
5f4c791e 99#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 100#ifdef CONFIG_PREEMPT_RT_FULL
101 synchronize_rcu();
102#endif
5f4c791e 103#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 104#ifdef CONFIG_PREEMPT_RT
105 synchronize_rcu();
106#endif
5f4c791e 107#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 108}
109
3c997079
MD		 110void lttng_lock_sessions(void)
111{
112 mutex_lock(&sessions_mutex);
113}
114
115void lttng_unlock_sessions(void)
116{
117 mutex_unlock(&sessions_mutex);
118}
119
9fe593d2
FD		 120static struct lttng_transport *lttng_transport_find(const char *name)
121{
122 struct lttng_transport *transport;
123
124 list_for_each_entry(transport, &lttng_transport_list, node) {
125 if (!strcmp(transport->name, name))
126 return transport;
127 }
128 return NULL;
129}
130
3c997079
MD		 131/*
132 * Called with sessions lock held.
133 */
134int lttng_session_active(void)
135{
136 struct lttng_session *iter;
137
138 list_for_each_entry(iter, &sessions, list) {
139 if (iter->active)
140 return 1;
141 }
142 return 0;
143}
144
a90917c3 145struct lttng_session *lttng_session_create(void)
4e3c1b9b 146{
a90917c3 147 struct lttng_session *session;
d83004aa 148 struct lttng_metadata_cache *metadata_cache;
3c997079 149 int i;
4e3c1b9b
MD		 150
151 mutex_lock(&sessions_mutex);
48f5e0b5 152 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
4e3c1b9b 153 if (!session)
d83004aa 154 goto err;
4e3c1b9b 155 INIT_LIST_HEAD(&session->chan);
f3d01b96 156 INIT_LIST_HEAD(&session->events);
a7008254 157 lttng_guid_gen(&session->uuid);
d83004aa
JD		 158
159 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
160 GFP_KERNEL);
161 if (!metadata_cache)
162 goto err_free_session;
0ca42eb7 163 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 164 if (!metadata_cache->data)
165 goto err_free_cache;
166 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
167 kref_init(&metadata_cache->refcount);
92d9f5e6 168 mutex_init(&metadata_cache->lock);
d83004aa
JD		 169 session->metadata_cache = metadata_cache;
170 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
a36580d5
MD		 171 memcpy(&metadata_cache->uuid, &session->uuid,
172 sizeof(metadata_cache->uuid));
3c997079
MD		 173 INIT_LIST_HEAD(&session->enablers_head);
174 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
175 INIT_HLIST_HEAD(&session->events_ht.table[i]);
4e3c1b9b 176 list_add(&session->list, &sessions);
d1f652f8
MD		 177 session->pid_tracker.session = session;
178 session->pid_tracker.tracker_type = TRACKER_PID;
179 session->vpid_tracker.session = session;
180 session->vpid_tracker.tracker_type = TRACKER_VPID;
181 session->uid_tracker.session = session;
182 session->uid_tracker.tracker_type = TRACKER_UID;
183 session->vuid_tracker.session = session;
184 session->vuid_tracker.tracker_type = TRACKER_VUID;
185 session->gid_tracker.session = session;
186 session->gid_tracker.tracker_type = TRACKER_GID;
187 session->vgid_tracker.session = session;
188 session->vgid_tracker.tracker_type = TRACKER_VGID;
4e3c1b9b
MD		 189 mutex_unlock(&sessions_mutex);
190 return session;
d83004aa
JD		 191
192err_free_cache:
193 kfree(metadata_cache);
194err_free_session:
48f5e0b5 195 lttng_kvfree(session);
d83004aa
JD		 196err:
197 mutex_unlock(&sessions_mutex);
198 return NULL;
199}
200
99f52fcc
FD		 201static
202struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
203{
204 struct lttng_counter_transport *transport;
205
206 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
207 if (!strcmp(transport->name, name))
208 return transport;
209 }
210 return NULL;
211}
212
213struct lttng_counter *lttng_kernel_counter_create(
214 const char *counter_transport_name,
215 size_t number_dimensions, const size_t *dimensions_sizes)
216{
217 struct lttng_counter *counter = NULL;
218 struct lttng_counter_transport *counter_transport = NULL;
219
220 counter_transport = lttng_counter_transport_find(counter_transport_name);
221 if (!counter_transport) {
222 printk(KERN_WARNING "LTTng: counter transport %s not found.\n",
223 counter_transport_name);
224 goto notransport;
225 }
226 if (!try_module_get(counter_transport->owner)) {
227 printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n");
228 goto notransport;
229 }
230
231 counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL);
232 if (!counter)
233 goto nomem;
234
235 /* Create event notifier error counter. */
236 counter->ops = &counter_transport->ops;
237 counter->transport = counter_transport;
238
239 counter->counter = counter->ops->counter_create(
240 number_dimensions, dimensions_sizes, 0);
241 if (!counter->counter) {
242 goto create_error;
243 }
244
245 return counter;
246
247create_error:
248 lttng_kvfree(counter);
249nomem:
250 if (counter_transport)
251 module_put(counter_transport->owner);
252notransport:
253 return NULL;
254}
255
750b05f2
FD		 256struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
257{
258 struct lttng_transport *transport = NULL;
259 struct lttng_event_notifier_group *event_notifier_group;
260 const char *transport_name = "relay-event-notifier";
261 size_t subbuf_size = 4096; //TODO
262 size_t num_subbuf = 16; //TODO
263 unsigned int switch_timer_interval = 0;
264 unsigned int read_timer_interval = 0;
dffef45d 265 int i;
750b05f2
FD		 266
267 mutex_lock(&sessions_mutex);
268
269 transport = lttng_transport_find(transport_name);
270 if (!transport) {
271 printk(KERN_WARNING "LTTng: transport %s not found\n",
272 transport_name);
273 goto notransport;
274 }
275 if (!try_module_get(transport->owner)) {
276 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
277 transport_name);
278 goto notransport;
279 }
280
281 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
282 GFP_KERNEL);
283 if (!event_notifier_group)
284 goto nomem;
285
286 /*
287 * Initialize the ring buffer used to store event notifier
288 * notifications.
289 */
290 event_notifier_group->ops = &transport->ops;
291 event_notifier_group->chan = transport->ops.channel_create(
292 transport_name, event_notifier_group, NULL,
293 subbuf_size, num_subbuf, switch_timer_interval,
294 read_timer_interval);
295 if (!event_notifier_group->chan)
296 goto create_error;
297
298 event_notifier_group->transport = transport;
dffef45d
FD		 299
300 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
301 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
302 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
303 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
304
750b05f2
FD		 305 list_add(&event_notifier_group->node, &event_notifier_groups);
306
307 mutex_unlock(&sessions_mutex);
308
309 return event_notifier_group;
310
311create_error:
312 lttng_kvfree(event_notifier_group);
313nomem:
314 if (transport)
315 module_put(transport->owner);
316notransport:
317 mutex_unlock(&sessions_mutex);
318 return NULL;
319}
320
d83004aa
JD		 321void metadata_cache_destroy(struct kref *kref)
322{
323 struct lttng_metadata_cache *cache =
324 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 325 vfree(cache->data);
d83004aa 326 kfree(cache);
4e3c1b9b
MD		 327}
328
a90917c3 329void lttng_session_destroy(struct lttng_session *session)
4e3c1b9b 330{
a90917c3
MD		 331 struct lttng_channel *chan, *tmpchan;
332 struct lttng_event *event, *tmpevent;
d83004aa 333 struct lttng_metadata_stream *metadata_stream;
b2bc0bc8 334 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
dda6a249 335 int ret;
4e3c1b9b
MD		 336
337 mutex_lock(&sessions_mutex);
a8f2d0c7 338 WRITE_ONCE(session->active, 0);
1ec65de1 339 list_for_each_entry(chan, &session->chan, list) {
3b82c4e1 340 ret = lttng_syscalls_unregister_channel(chan);
1ec65de1
MD		 341 WARN_ON(ret);
342 }
dda6a249 343 list_for_each_entry(event, &session->events, list) {
a90917c3 344 ret = _lttng_event_unregister(event);
dda6a249
MD		 345 WARN_ON(ret);
346 }
abcca994 347 synchronize_trace(); /* Wait for in-flight events to complete */
badfe9f5 348 list_for_each_entry(chan, &session->chan, list) {
2d6d88c6 349 ret = lttng_syscalls_destroy_event(chan);
badfe9f5
MD		 350 WARN_ON(ret);
351 }
b2bc0bc8 352 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
3c997079 353 &session->enablers_head, node)
b2bc0bc8 354 lttng_event_enabler_destroy(event_enabler);
4e3c1b9b 355 list_for_each_entry_safe(event, tmpevent, &session->events, list)
a90917c3 356 _lttng_event_destroy(event);
d83004aa
JD		 357 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
358 BUG_ON(chan->channel_type == METADATA_CHANNEL);
a90917c3 359 _lttng_channel_destroy(chan);
d83004aa 360 }
ab036a63 361 mutex_lock(&session->metadata_cache->lock);
d83004aa
JD		 362 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
363 _lttng_metadata_channel_hangup(metadata_stream);
ab036a63 364 mutex_unlock(&session->metadata_cache->lock);
d1f652f8
MD		 365 lttng_id_tracker_destroy(&session->pid_tracker, false);
366 lttng_id_tracker_destroy(&session->vpid_tracker, false);
367 lttng_id_tracker_destroy(&session->uid_tracker, false);
368 lttng_id_tracker_destroy(&session->vuid_tracker, false);
369 lttng_id_tracker_destroy(&session->gid_tracker, false);
370 lttng_id_tracker_destroy(&session->vgid_tracker, false);
d83004aa 371 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
4e3c1b9b
MD		 372 list_del(&session->list);
373 mutex_unlock(&sessions_mutex);
48f5e0b5 374 lttng_kvfree(session);
4e3c1b9b
MD		 375}
376
dffef45d
FD		 377void lttng_event_notifier_group_destroy(
378 struct lttng_event_notifier_group *event_notifier_group)
750b05f2 379{
dffef45d
FD		 380 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
381 struct lttng_event_notifier *event_notifier, *tmpevent_notifier;
382 int ret;
383
750b05f2
FD		 384 if (!event_notifier_group)
385 return;
386
387 mutex_lock(&sessions_mutex);
dffef45d 388
3b82c4e1 389 ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group);
8a8ac9a8
FD		 390 WARN_ON(ret);
391
dffef45d
FD		 392 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
393 &event_notifier_group->event_notifiers_head, list) {
394 ret = _lttng_event_notifier_unregister(event_notifier);
395 WARN_ON(ret);
396 }
397
b01155ba
FD		 398 /* Wait for in-flight event notifier to complete */
399 synchronize_trace();
400
21f58fb7
FD		 401 irq_work_sync(&event_notifier_group->wakeup_pending);
402
8a8ac9a8
FD		 403 kfree(event_notifier_group->sc_filter);
404
dffef45d
FD		 405 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
406 &event_notifier_group->enablers_head, node)
407 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
408
409 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
410 &event_notifier_group->event_notifiers_head, list)
411 _lttng_event_notifier_destroy(event_notifier);
412
99f52fcc
FD		 413 if (event_notifier_group->error_counter) {
414 struct lttng_counter *error_counter = event_notifier_group->error_counter;
ab04d7b1 415
99f52fcc
FD		 416 error_counter->ops->counter_destroy(error_counter->counter);
417 module_put(error_counter->transport->owner);
418 lttng_kvfree(error_counter);
419 event_notifier_group->error_counter = NULL;
420 }
421
750b05f2
FD		 422 event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
423 module_put(event_notifier_group->transport->owner);
424 list_del(&event_notifier_group->node);
dffef45d 425
750b05f2
FD		 426 mutex_unlock(&sessions_mutex);
427 lttng_kvfree(event_notifier_group);
428}
429
601252cf
MD		 430int lttng_session_statedump(struct lttng_session *session)
431{
432 int ret;
433
434 mutex_lock(&sessions_mutex);
435 ret = lttng_statedump_start(session);
436 mutex_unlock(&sessions_mutex);
437 return ret;
438}
439
a90917c3 440int lttng_session_enable(struct lttng_session *session)
c0e31d2e
MD		 441{
442 int ret = 0;
a90917c3 443 struct lttng_channel *chan;
c0e31d2e
MD		 444
445 mutex_lock(&sessions_mutex);
446 if (session->active) {
447 ret = -EBUSY;
448 goto end;
449 }
c099397a 450
3c997079
MD		 451 /* Set transient enabler state to "enabled" */
452 session->tstate = 1;
453
4ef81e4a 454 /* We need to sync enablers with session before activation. */
b2bc0bc8 455 lttng_session_sync_event_enablers(session);
4ef81e4a 456
c099397a
MD		 457 /*
458 * Snapshot the number of events per channel to know the type of header
459 * we need to use.
460 */
461 list_for_each_entry(chan, &session->chan, list) {
462 if (chan->header_type)
463 continue; /* don't change it if session stop/restart */
464 if (chan->free_event_id < 31)
465 chan->header_type = 1; /* compact */
466 else
467 chan->header_type = 2; /* large */
468 }
469
64af2437 470 /* Clear each stream's quiescent state. */
09b93db9
MD		 471 list_for_each_entry(chan, &session->chan, list) {
472 if (chan->channel_type != METADATA_CHANNEL)
473 lib_ring_buffer_clear_quiescent_channel(chan->chan);
474 }
64af2437 475
a8f2d0c7
MJ		 476 WRITE_ONCE(session->active, 1);
477 WRITE_ONCE(session->been_active, 1);
a90917c3 478 ret = _lttng_session_metadata_statedump(session);
c337ddc2 479 if (ret) {
a8f2d0c7 480 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 481 goto end;
482 }
483 ret = lttng_statedump_start(session);
360f38ea 484 if (ret)
a8f2d0c7 485 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 486end:
487 mutex_unlock(&sessions_mutex);
11b5a3c2 488 return ret;
c0e31d2e
MD		 489}
490
a90917c3 491int lttng_session_disable(struct lttng_session *session)
c0e31d2e
MD		 492{
493 int ret = 0;
64af2437 494 struct lttng_channel *chan;
c0e31d2e
MD		 495
496 mutex_lock(&sessions_mutex);
497 if (!session->active) {
498 ret = -EBUSY;
499 goto end;
500 }
a8f2d0c7 501 WRITE_ONCE(session->active, 0);
3c997079
MD		 502
503 /* Set transient enabler state to "disabled" */
504 session->tstate = 0;
b2bc0bc8 505 lttng_session_sync_event_enablers(session);
64af2437
MD		 506
507 /* Set each stream's quiescent state. */
09b93db9
MD		 508 list_for_each_entry(chan, &session->chan, list) {
509 if (chan->channel_type != METADATA_CHANNEL)
510 lib_ring_buffer_set_quiescent_channel(chan->chan);
511 }
c0e31d2e
MD		 512end:
513 mutex_unlock(&sessions_mutex);
11b5a3c2 514 return ret;
c0e31d2e
MD		 515}
516
9616f0bf
JD		 517int lttng_session_metadata_regenerate(struct lttng_session *session)
518{
519 int ret = 0;
520 struct lttng_channel *chan;
521 struct lttng_event *event;
522 struct lttng_metadata_cache *cache = session->metadata_cache;
523 struct lttng_metadata_stream *stream;
524
525 mutex_lock(&sessions_mutex);
526 if (!session->active) {
527 ret = -EBUSY;
528 goto end;
529 }
530
531 mutex_lock(&cache->lock);
532 memset(cache->data, 0, cache->cache_alloc);
533 cache->metadata_written = 0;
534 cache->version++;
535 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
536 stream->metadata_out = 0;
537 stream->metadata_in = 0;
538 }
539 mutex_unlock(&cache->lock);
540
541 session->metadata_dumped = 0;
542 list_for_each_entry(chan, &session->chan, list) {
543 chan->metadata_dumped = 0;
544 }
545
546 list_for_each_entry(event, &session->events, list) {
547 event->metadata_dumped = 0;
548 }
549
550 ret = _lttng_session_metadata_statedump(session);
551
552end:
553 mutex_unlock(&sessions_mutex);
554 return ret;
555}
556
a90917c3 557int lttng_channel_enable(struct lttng_channel *channel)
e64957da 558{
3c997079 559 int ret = 0;
e64957da 560
3c997079
MD		 561 mutex_lock(&sessions_mutex);
562 if (channel->channel_type == METADATA_CHANNEL) {
563 ret = -EPERM;
564 goto end;
565 }
566 if (channel->enabled) {
567 ret = -EEXIST;
568 goto end;
569 }
570 /* Set transient enabler state to "enabled" */
571 channel->tstate = 1;
b2bc0bc8 572 lttng_session_sync_event_enablers(channel->session);
3c997079 573 /* Set atomically the state to "enabled" */
a8f2d0c7 574 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 575end:
576 mutex_unlock(&sessions_mutex);
577 return ret;
e64957da
MD		 578}
579
a90917c3 580int lttng_channel_disable(struct lttng_channel *channel)
e64957da 581{
3c997079 582 int ret = 0;
e64957da 583
3c997079
MD		 584 mutex_lock(&sessions_mutex);
585 if (channel->channel_type == METADATA_CHANNEL) {
586 ret = -EPERM;
587 goto end;
588 }
589 if (!channel->enabled) {
590 ret = -EEXIST;
591 goto end;
592 }
593 /* Set atomically the state to "disabled" */
a8f2d0c7 594 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 595 /* Set transient enabler state to "enabled" */
596 channel->tstate = 0;
b2bc0bc8 597 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 598end:
599 mutex_unlock(&sessions_mutex);
600 return ret;
e64957da
MD		 601}
602
a90917c3 603int lttng_event_enable(struct lttng_event *event)
e64957da 604{
3c997079 605 int ret = 0;
e64957da 606
3c997079
MD		 607 mutex_lock(&sessions_mutex);
608 if (event->chan->channel_type == METADATA_CHANNEL) {
609 ret = -EPERM;
610 goto end;
611 }
612 if (event->enabled) {
613 ret = -EEXIST;
614 goto end;
615 }
a0493bef
MD		 616 switch (event->instrumentation) {
617 case LTTNG_KERNEL_TRACEPOINT:
618 case LTTNG_KERNEL_SYSCALL:
619 ret = -EINVAL;
620 break;
621 case LTTNG_KERNEL_KPROBE:
149b9a9d 622 case LTTNG_KERNEL_UPROBE:
a0493bef 623 case LTTNG_KERNEL_NOOP:
a8f2d0c7 624 WRITE_ONCE(event->enabled, 1);
a0493bef
MD		 625 break;
626 case LTTNG_KERNEL_KRETPROBE:
627 ret = lttng_kretprobes_event_enable_state(event, 1);
628 break;
e884017c 629 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
a0493bef
MD		 630 default:
631 WARN_ON_ONCE(1);
632 ret = -EINVAL;
633 }
3c997079
MD		 634end:
635 mutex_unlock(&sessions_mutex);
636 return ret;
e64957da
MD		 637}
638
a90917c3 639int lttng_event_disable(struct lttng_event *event)
e64957da 640{
3c997079 641 int ret = 0;
e64957da 642
3c997079
MD		 643 mutex_lock(&sessions_mutex);
644 if (event->chan->channel_type == METADATA_CHANNEL) {
645 ret = -EPERM;
646 goto end;
647 }
648 if (!event->enabled) {
649 ret = -EEXIST;
650 goto end;
651 }
a0493bef
MD		 652 switch (event->instrumentation) {
653 case LTTNG_KERNEL_TRACEPOINT:
654 case LTTNG_KERNEL_SYSCALL:
655 ret = -EINVAL;
656 break;
657 case LTTNG_KERNEL_KPROBE:
149b9a9d 658 case LTTNG_KERNEL_UPROBE:
a0493bef 659 case LTTNG_KERNEL_NOOP:
a8f2d0c7 660 WRITE_ONCE(event->enabled, 0);
a0493bef
MD		 661 break;
662 case LTTNG_KERNEL_KRETPROBE:
663 ret = lttng_kretprobes_event_enable_state(event, 0);
664 break;
e884017c 665 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
a0493bef
MD		 666 default:
667 WARN_ON_ONCE(1);
668 ret = -EINVAL;
669 }
3c997079
MD		 670end:
671 mutex_unlock(&sessions_mutex);
672 return ret;
e64957da
MD		 673}
674
dffef45d
FD		 675int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier)
676{
677 int ret = 0;
678
679 mutex_lock(&sessions_mutex);
680 if (event_notifier->enabled) {
681 ret = -EEXIST;
682 goto end;
683 }
684 switch (event_notifier->instrumentation) {
685 case LTTNG_KERNEL_TRACEPOINT:
8a8ac9a8 686 case LTTNG_KERNEL_SYSCALL:
b01155ba
FD		 687 ret = -EINVAL;
688 break;
dffef45d 689 case LTTNG_KERNEL_KPROBE:
9de67196 690 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 691 WRITE_ONCE(event_notifier->enabled, 1);
692 break;
dffef45d 693 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 694 case LTTNG_KERNEL_NOOP:
695 case LTTNG_KERNEL_KRETPROBE:
696 default:
697 WARN_ON_ONCE(1);
698 ret = -EINVAL;
699 }
700end:
701 mutex_unlock(&sessions_mutex);
702 return ret;
703}
704
705int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier)
706{
707 int ret = 0;
708
709 mutex_lock(&sessions_mutex);
710 if (!event_notifier->enabled) {
711 ret = -EEXIST;
712 goto end;
713 }
714 switch (event_notifier->instrumentation) {
715 case LTTNG_KERNEL_TRACEPOINT:
8a8ac9a8 716 case LTTNG_KERNEL_SYSCALL:
b01155ba
FD		 717 ret = -EINVAL;
718 break;
dffef45d 719 case LTTNG_KERNEL_KPROBE:
9de67196 720 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 721 WRITE_ONCE(event_notifier->enabled, 0);
722 break;
dffef45d 723 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 724 case LTTNG_KERNEL_NOOP:
725 case LTTNG_KERNEL_KRETPROBE:
726 default:
727 WARN_ON_ONCE(1);
728 ret = -EINVAL;
729 }
730end:
731 mutex_unlock(&sessions_mutex);
732 return ret;
733}
734
a90917c3 735struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 736 const char *transport_name,
737 void *buf_addr,
4e3c1b9b
MD		 738 size_t subbuf_size, size_t num_subbuf,
739 unsigned int switch_timer_interval,
d83004aa
JD		 740 unsigned int read_timer_interval,
741 enum channel_type channel_type)
4e3c1b9b 742{
a90917c3
MD		 743 struct lttng_channel *chan;
744 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 745
746 mutex_lock(&sessions_mutex);
d83004aa 747 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 748 goto active; /* Refuse to add channel to active session */
a90917c3 749 transport = lttng_transport_find(transport_name);
f3d01b96 750 if (!transport) {
5a15f70c 751 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 752 transport_name);
c0e31d2e 753 goto notransport;
f3d01b96 754 }
a33c9927 755 if (!try_module_get(transport->owner)) {
5a15f70c 756 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 757 goto notransport;
758 }
a90917c3 759 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 760 if (!chan)
c0e31d2e 761 goto nomem;
4e3c1b9b 762 chan->session = session;
05d32c64 763 chan->id = session->free_chan_id++;
3b731ab1 764 chan->ops = &transport->ops;
125b4df4
MD		 765 /*
766 * Note: the channel creation op already writes into the packet
767 * headers. Therefore the "chan" information used as input
768 * should be already accessible.
769 */
5f5ddf01
MD		 770 chan->chan = transport->ops.channel_create(transport_name,
771 chan, buf_addr, subbuf_size, num_subbuf,
772 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 773 if (!chan->chan)
774 goto create_error;
3c997079 775 chan->tstate = 1;
e64957da 776 chan->enabled = 1;
a33c9927 777 chan->transport = transport;
d83004aa 778 chan->channel_type = channel_type;
4e3c1b9b
MD		 779 list_add(&chan->list, &session->chan);
780 mutex_unlock(&sessions_mutex);
781 return chan;
782
f3d01b96
MD		 783create_error:
784 kfree(chan);
c0e31d2e 785nomem:
a33c9927
MD		 786 if (transport)
787 module_put(transport->owner);
c0e31d2e 788notransport:
e5382b6d 789active:
4e3c1b9b
MD		 790 mutex_unlock(&sessions_mutex);
791 return NULL;
792}
793
794/*
d83004aa
JD		 795 * Only used internally at session destruction for per-cpu channels, and
796 * when metadata channel is released.
797 * Needs to be called with sessions mutex held.
4e3c1b9b 798 */
aa7c23a9 799static
a90917c3 800void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 801{
11b5a3c2 802 chan->ops->channel_destroy(chan->chan);
a33c9927 803 module_put(chan->transport->owner);
4e3c1b9b 804 list_del(&chan->list);
8070f5c0 805 lttng_destroy_context(chan->ctx);
4e3c1b9b
MD		 806 kfree(chan);
807}
808
d83004aa
JD		 809void lttng_metadata_channel_destroy(struct lttng_channel *chan)
810{
811 BUG_ON(chan->channel_type != METADATA_CHANNEL);
812
813 /* Protect the metadata cache with the sessions_mutex. */
814 mutex_lock(&sessions_mutex);
815 _lttng_channel_destroy(chan);
816 mutex_unlock(&sessions_mutex);
817}
818EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
819
820static
821void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
822{
823 stream->finalized = 1;
824 wake_up_interruptible(&stream->read_wait);
825}
826
a101fa10 827
e5382b6d
MD		 828/*
829 * Supports event creation while tracing session is active.
3c997079 830 * Needs to be called with sessions mutex held.
e5382b6d 831 */
3c997079
MD		 832struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
833 struct lttng_kernel_event *event_param,
834 void *filter,
835 const struct lttng_event_desc *event_desc,
836 enum lttng_kernel_instrumentation itype)
4e3c1b9b 837{
3c997079 838 struct lttng_session *session = chan->session;
a90917c3 839 struct lttng_event *event;
3c997079
MD		 840 const char *event_name;
841 struct hlist_head *head;
3d084699 842 int ret;
4e3c1b9b 843
abc0446a 844 if (chan->free_event_id == -1U) {
4cf0bf51 845 ret = -EMFILE;
e5382b6d 846 goto full;
abc0446a 847 }
3c997079
MD		 848
849 switch (itype) {
850 case LTTNG_KERNEL_TRACEPOINT:
851 event_name = event_desc->name;
852 break;
853 case LTTNG_KERNEL_KPROBE:
149b9a9d 854 case LTTNG_KERNEL_UPROBE:
3c997079 855 case LTTNG_KERNEL_KRETPROBE:
3c997079 856 case LTTNG_KERNEL_NOOP:
33a39a3c 857 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 858 event_name = event_param->name;
859 break;
e884017c 860 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
3c997079
MD		 861 default:
862 WARN_ON_ONCE(1);
863 ret = -EINVAL;
864 goto type_error;
865 }
4a11ef1c
FD		 866
867 head = utils_borrow_hash_table_bucket(session->events_ht.table,
868 LTTNG_EVENT_HT_SIZE, event_name);
d216ecae 869 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079
MD		 870 WARN_ON_ONCE(!event->desc);
871 if (!strncmp(event->desc->name, event_name,
872 LTTNG_KERNEL_SYM_NAME_LEN - 1)
873 && chan == event->chan) {
874 ret = -EEXIST;
875 goto exist;
abc0446a
MD		 876 }
877 }
3c997079 878
11b5a3c2 879 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 880 if (!event) {
4cf0bf51 881 ret = -ENOMEM;
4e3c1b9b 882 goto cache_error;
abc0446a 883 }
4e3c1b9b
MD		 884 event->chan = chan;
885 event->filter = filter;
e5382b6d 886 event->id = chan->free_event_id++;
3c997079
MD		 887 event->instrumentation = itype;
888 event->evtype = LTTNG_TYPE_EVENT;
183e8b3a 889 INIT_LIST_HEAD(&event->filter_bytecode_runtime_head);
3c997079
MD		 890 INIT_LIST_HEAD(&event->enablers_ref_head);
891
892 switch (itype) {
ab2277d6 893 case LTTNG_KERNEL_TRACEPOINT:
3c997079
MD		 894 /* Event will be enabled by enabler sync. */
895 event->enabled = 0;
896 event->registered = 0;
0bcedee9 897 event->desc = lttng_event_desc_get(event_name);
abc0446a 898 if (!event->desc) {
4cf0bf51 899 ret = -ENOENT;
d3dbe23c 900 goto register_error;
abc0446a 901 }
3c997079
MD		 902 /* Populate lttng_event structure before event registration. */
903 smp_wmb();
baf20995 904 break;
ab2277d6 905 case LTTNG_KERNEL_KPROBE:
a0493bef
MD		 906 /*
907 * Needs to be explicitly enabled after creation, since
908 * we may want to apply filters.
909 */
910 event->enabled = 0;
3c997079
MD		 911 event->registered = 1;
912 /*
913 * Populate lttng_event structure before event
914 * registration.
915 */
916 smp_wmb();
8bf17deb 917 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 918 event_param->u.kprobe.symbol_name,
919 event_param->u.kprobe.offset,
920 event_param->u.kprobe.addr,
921 event);
abc0446a 922 if (ret) {
4cf0bf51 923 ret = -EINVAL;
d6d808f3 924 goto register_error;
abc0446a 925 }
edeb3137
MD		 926 ret = try_module_get(event->desc->owner);
927 WARN_ON_ONCE(!ret);
d6d808f3 928 break;
7371f44c
MD		 929 case LTTNG_KERNEL_KRETPROBE:
930 {
a90917c3 931 struct lttng_event *event_return;
7371f44c
MD		 932
933 /* kretprobe defines 2 events */
a0493bef
MD		 934 /*
935 * Needs to be explicitly enabled after creation, since
936 * we may want to apply filters.
937 */
938 event->enabled = 0;
3c997079 939 event->registered = 1;
7371f44c
MD		 940 event_return =
941 kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 942 if (!event_return) {
4cf0bf51 943 ret = -ENOMEM;
7371f44c 944 goto register_error;
abc0446a 945 }
7371f44c
MD		 946 event_return->chan = chan;
947 event_return->filter = filter;
948 event_return->id = chan->free_event_id++;
a0493bef 949 event_return->enabled = 0;
3c997079
MD		 950 event_return->registered = 1;
951 event_return->instrumentation = itype;
7371f44c 952 /*
a90917c3 953 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 954 */
955 smp_wmb();
3c997079 956 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 957 event_param->u.kretprobe.symbol_name,
958 event_param->u.kretprobe.offset,
959 event_param->u.kretprobe.addr,
960 event, event_return);
961 if (ret) {
962 kmem_cache_free(event_cache, event_return);
4cf0bf51 963 ret = -EINVAL;
7371f44c
MD		 964 goto register_error;
965 }
966 /* Take 2 refs on the module: one per event. */
967 ret = try_module_get(event->desc->owner);
968 WARN_ON_ONCE(!ret);
969 ret = try_module_get(event->desc->owner);
970 WARN_ON_ONCE(!ret);
a90917c3 971 ret = _lttng_event_metadata_statedump(chan->session, chan,
7371f44c 972 event_return);
abc0446a 973 WARN_ON_ONCE(ret > 0);
7371f44c
MD		 974 if (ret) {
975 kmem_cache_free(event_cache, event_return);
976 module_put(event->desc->owner);
977 module_put(event->desc->owner);
978 goto statedump_error;
979 }
980 list_add(&event_return->list, &chan->session->events);
981 break;
982 }
1ec65de1 983 case LTTNG_KERNEL_NOOP:
33a39a3c 984 case LTTNG_KERNEL_SYSCALL:
a0493bef
MD		 985 /*
986 * Needs to be explicitly enabled after creation, since
987 * we may want to apply filters.
988 */
989 event->enabled = 0;
3c997079
MD		 990 event->registered = 0;
991 event->desc = event_desc;
badfe9f5
MD		 992 switch (event_param->u.syscall.entryexit) {
993 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
994 ret = -EINVAL;
995 goto register_error;
996 case LTTNG_KERNEL_SYSCALL_ENTRY:
997 event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
998 break;
999 case LTTNG_KERNEL_SYSCALL_EXIT:
1000 event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1001 break;
1002 }
1003 switch (event_param->u.syscall.abi) {
1004 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1005 ret = -EINVAL;
1006 goto register_error;
1007 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1008 event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1009 break;
1010 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1011 event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1012 break;
1013 }
abc0446a 1014 if (!event->desc) {
4cf0bf51 1015 ret = -EINVAL;
259b6cb3 1016 goto register_error;
abc0446a 1017 }
1ec65de1 1018 break;
149b9a9d 1019 case LTTNG_KERNEL_UPROBE:
a344f64b
FD		 1020 /*
1021 * Needs to be explicitly enabled after creation, since
1022 * we may want to apply filters.
1023 */
1024 event->enabled = 0;
1025 event->registered = 1;
3aed4dca 1026
a344f64b
FD		 1027 /*
1028 * Populate lttng_event structure before event
1029 * registration.
1030 */
1031 smp_wmb();
149b9a9d 1032
83b802dc 1033 ret = lttng_uprobes_register_event(event_param->name,
56377c91 1034 event_param->u.uprobe.fd,
149b9a9d
YB		 1035 event);
1036 if (ret)
1037 goto register_error;
1038 ret = try_module_get(event->desc->owner);
1039 WARN_ON_ONCE(!ret);
1040 break;
e884017c 1041 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
baf20995
MD		 1042 default:
1043 WARN_ON_ONCE(1);
4cf0bf51 1044 ret = -EINVAL;
df07930b 1045 goto register_error;
baf20995 1046 }
a90917c3 1047 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
abc0446a
MD		 1048 WARN_ON_ONCE(ret > 0);
1049 if (ret) {
c099397a 1050 goto statedump_error;
abc0446a 1051 }
3c997079 1052 hlist_add_head(&event->hlist, head);
dda6a249 1053 list_add(&event->list, &chan->session->events);
4e3c1b9b
MD		 1054 return event;
1055
c099397a 1056statedump_error:
259b6cb3 1057 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 1058register_error:
11b5a3c2 1059 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 1060cache_error:
1061exist:
3c997079 1062type_error:
e5382b6d 1063full:
4cf0bf51 1064 return ERR_PTR(ret);
4e3c1b9b
MD		 1065}
1066
dffef45d
FD		 1067struct lttng_event_notifier *_lttng_event_notifier_create(
1068 const struct lttng_event_desc *event_desc,
99f52fcc
FD		 1069 uint64_t token, uint64_t error_counter_index,
1070 struct lttng_event_notifier_group *event_notifier_group,
dffef45d
FD		 1071 struct lttng_kernel_event_notifier *event_notifier_param,
1072 void *filter, enum lttng_kernel_instrumentation itype)
1073{
1074 struct lttng_event_notifier *event_notifier;
ab04d7b1 1075 struct lttng_counter *error_counter;
dffef45d
FD		 1076 const char *event_name;
1077 struct hlist_head *head;
1078 int ret;
1079
1080 switch (itype) {
1081 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1082 event_name = event_desc->name;
1083 break;
dffef45d 1084 case LTTNG_KERNEL_KPROBE:
9de67196 1085 case LTTNG_KERNEL_UPROBE:
8a8ac9a8 1086 case LTTNG_KERNEL_SYSCALL:
2b16f0c9
FD		 1087 event_name = event_notifier_param->event.name;
1088 break;
dffef45d
FD		 1089 case LTTNG_KERNEL_KRETPROBE:
1090 case LTTNG_KERNEL_FUNCTION:
1091 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1092 default:
1093 WARN_ON_ONCE(1);
1094 ret = -EINVAL;
1095 goto type_error;
1096 }
1097
1098 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1099 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
1100 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1101 WARN_ON_ONCE(!event_notifier->desc);
1102 if (!strncmp(event_notifier->desc->name, event_name,
1103 LTTNG_KERNEL_SYM_NAME_LEN - 1)
1104 && event_notifier_group == event_notifier->group
1105 && token == event_notifier->user_token) {
1106 ret = -EEXIST;
1107 goto exist;
1108 }
1109 }
1110
1111 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1112 if (!event_notifier) {
1113 ret = -ENOMEM;
1114 goto cache_error;
1115 }
21f58fb7 1116
dffef45d
FD		 1117 event_notifier->group = event_notifier_group;
1118 event_notifier->user_token = token;
99f52fcc 1119 event_notifier->error_counter_index = error_counter_index;
99d223ad 1120 event_notifier->num_captures = 0;
dffef45d
FD		 1121 event_notifier->filter = filter;
1122 event_notifier->instrumentation = itype;
1123 event_notifier->evtype = LTTNG_TYPE_EVENT;
21f58fb7 1124 event_notifier->send_notification = lttng_event_notifier_notification_send;
183e8b3a 1125 INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head);
99d223ad 1126 INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
dffef45d
FD		 1127 INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
1128
1129 switch (itype) {
1130 case LTTNG_KERNEL_TRACEPOINT:
1131 /* Event will be enabled by enabler sync. */
1132 event_notifier->enabled = 0;
1133 event_notifier->registered = 0;
1134 event_notifier->desc = lttng_event_desc_get(event_name);
1135 if (!event_notifier->desc) {
1136 ret = -ENOENT;
1137 goto register_error;
1138 }
1139 /* Populate lttng_event_notifier structure before event registration. */
1140 smp_wmb();
1141 break;
1142 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1143 /*
1144 * Needs to be explicitly enabled after creation, since
1145 * we may want to apply filters.
1146 */
1147 event_notifier->enabled = 0;
1148 event_notifier->registered = 1;
1149 /*
1150 * Populate lttng_event_notifier structure before event
1151 * registration.
1152 */
1153 smp_wmb();
1154 ret = lttng_kprobes_register_event_notifier(
1155 event_notifier_param->event.u.kprobe.symbol_name,
1156 event_notifier_param->event.u.kprobe.offset,
1157 event_notifier_param->event.u.kprobe.addr,
1158 event_notifier);
1159 if (ret) {
1160 ret = -EINVAL;
1161 goto register_error;
1162 }
1163 ret = try_module_get(event_notifier->desc->owner);
1164 WARN_ON_ONCE(!ret);
1165 break;
8a8ac9a8
FD		 1166 case LTTNG_KERNEL_NOOP:
1167 case LTTNG_KERNEL_SYSCALL:
1168 /*
1169 * Needs to be explicitly enabled after creation, since
1170 * we may want to apply filters.
1171 */
1172 event_notifier->enabled = 0;
1173 event_notifier->registered = 0;
1174 event_notifier->desc = event_desc;
1175 switch (event_notifier_param->event.u.syscall.entryexit) {
1176 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1177 ret = -EINVAL;
1178 goto register_error;
1179 case LTTNG_KERNEL_SYSCALL_ENTRY:
1180 event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1181 break;
1182 case LTTNG_KERNEL_SYSCALL_EXIT:
1183 event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1184 break;
1185 }
1186 switch (event_notifier_param->event.u.syscall.abi) {
1187 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1188 ret = -EINVAL;
1189 goto register_error;
1190 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1191 event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1192 break;
1193 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1194 event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1195 break;
1196 }
1197
1198 if (!event_notifier->desc) {
1199 ret = -EINVAL;
1200 goto register_error;
1201 }
1202 break;
dffef45d 1203 case LTTNG_KERNEL_UPROBE:
9de67196
FD		 1204 /*
1205 * Needs to be explicitly enabled after creation, since
1206 * we may want to apply filters.
1207 */
1208 event_notifier->enabled = 0;
1209 event_notifier->registered = 1;
1210
1211 /*
1212 * Populate lttng_event_notifier structure before
1213 * event_notifier registration.
1214 */
1215 smp_wmb();
1216
1217 ret = lttng_uprobes_register_event_notifier(
1218 event_notifier_param->event.name,
1219 event_notifier_param->event.u.uprobe.fd,
1220 event_notifier);
1221 if (ret)
1222 goto register_error;
1223 ret = try_module_get(event_notifier->desc->owner);
1224 WARN_ON_ONCE(!ret);
1225 break;
dffef45d
FD		 1226 case LTTNG_KERNEL_KRETPROBE:
1227 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 1228 default:
1229 WARN_ON_ONCE(1);
1230 ret = -EINVAL;
1231 goto register_error;
1232 }
1233
1234 list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head);
1235 hlist_add_head(&event_notifier->hlist, head);
99f52fcc
FD		 1236
1237 /*
1238 * Clear the error counter bucket. The sessiond keeps track of which
ab04d7b1
MD		 1239 * bucket is currently in use. We trust it. The session lock
1240 * synchronizes against concurrent creation of the error
1241 * counter.
99f52fcc 1242 */
ab04d7b1
MD		 1243 error_counter = event_notifier_group->error_counter;
1244 if (error_counter) {
99f52fcc
FD		 1245 size_t dimension_index[1];
1246
1247 /*
1248 * Check that the index is within the boundary of the counter.
1249 */
1250 if (event_notifier->error_counter_index >= event_notifier_group->error_counter_len) {
1251 printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1252 event_notifier_group->error_counter_len, event_notifier->error_counter_index);
1253 ret = -EINVAL;
1254 goto register_error;
1255 }
1256
1257 dimension_index[0] = event_notifier->error_counter_index;
ab04d7b1 1258 ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index);
99f52fcc
FD		 1259 if (ret) {
1260 printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1261 event_notifier->error_counter_index);
1262 goto register_error;
1263 }
1264 }
1265
dffef45d
FD		 1266 return event_notifier;
1267
1268register_error:
1269 kmem_cache_free(event_notifier_cache, event_notifier);
1270cache_error:
1271exist:
1272type_error:
1273 return ERR_PTR(ret);
1274}
1275
99f52fcc
FD		 1276int lttng_kernel_counter_read(struct lttng_counter *counter,
1277 const size_t *dim_indexes, int32_t cpu,
1278 int64_t *val, bool *overflow, bool *underflow)
1279{
1280 return counter->ops->counter_read(counter->counter, dim_indexes,
1281 cpu, val, overflow, underflow);
1282}
1283
1284int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1285 const size_t *dim_indexes, int64_t *val,
1286 bool *overflow, bool *underflow)
1287{
1288 return counter->ops->counter_aggregate(counter->counter, dim_indexes,
1289 val, overflow, underflow);
1290}
1291
1292int lttng_kernel_counter_clear(struct lttng_counter *counter,
1293 const size_t *dim_indexes)
1294{
1295 return counter->ops->counter_clear(counter->counter, dim_indexes);
1296}
1297
3c997079
MD		 1298struct lttng_event *lttng_event_create(struct lttng_channel *chan,
1299 struct lttng_kernel_event *event_param,
1300 void *filter,
1301 const struct lttng_event_desc *event_desc,
1302 enum lttng_kernel_instrumentation itype)
1303{
1304 struct lttng_event *event;
1305
1306 mutex_lock(&sessions_mutex);
1307 event = _lttng_event_create(chan, event_param, filter, event_desc,
1308 itype);
1309 mutex_unlock(&sessions_mutex);
1310 return event;
1311}
1312
dffef45d
FD		 1313struct lttng_event_notifier *lttng_event_notifier_create(
1314 const struct lttng_event_desc *event_desc,
99f52fcc
FD		 1315 uint64_t id, uint64_t error_counter_index,
1316 struct lttng_event_notifier_group *event_notifier_group,
dffef45d
FD		 1317 struct lttng_kernel_event_notifier *event_notifier_param,
1318 void *filter, enum lttng_kernel_instrumentation itype)
1319{
1320 struct lttng_event_notifier *event_notifier;
1321
1322 mutex_lock(&sessions_mutex);
1323 event_notifier = _lttng_event_notifier_create(event_desc, id,
99f52fcc
FD		 1324 error_counter_index, event_notifier_group,
1325 event_notifier_param, filter, itype);
dffef45d
FD		 1326 mutex_unlock(&sessions_mutex);
1327 return event_notifier;
1328}
1329
3c997079
MD		 1330/* Only used for tracepoints for now. */
1331static
1332void register_event(struct lttng_event *event)
1333{
1334 const struct lttng_event_desc *desc;
f127e61e 1335 int ret = -EINVAL;
3c997079 1336
3c997079
MD		 1337 if (event->registered)
1338 return;
4ecb5ad5 1339
3c997079 1340 desc = event->desc;
4ecb5ad5
MD		 1341 switch (event->instrumentation) {
1342 case LTTNG_KERNEL_TRACEPOINT:
1343 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1344 desc->probe_callback,
1345 event);
1346 break;
1347 case LTTNG_KERNEL_SYSCALL:
2d6d88c6 1348 ret = lttng_syscall_filter_enable_event(event->chan, event);
4ecb5ad5
MD		 1349 break;
1350 case LTTNG_KERNEL_KPROBE:
a344f64b 1351 case LTTNG_KERNEL_UPROBE:
4ecb5ad5 1352 case LTTNG_KERNEL_KRETPROBE:
4ecb5ad5
MD		 1353 case LTTNG_KERNEL_NOOP:
1354 ret = 0;
1355 break;
e884017c 1356 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
4ecb5ad5
MD		 1357 default:
1358 WARN_ON_ONCE(1);
1359 }
3c997079
MD		 1360 if (!ret)
1361 event->registered = 1;
1362}
1363
4e3c1b9b
MD		 1364/*
1365 * Only used internally at session destruction.
1366 */
a90917c3 1367int _lttng_event_unregister(struct lttng_event *event)
4e3c1b9b 1368{
4ecb5ad5 1369 const struct lttng_event_desc *desc;
11b5a3c2
MD		 1370 int ret = -EINVAL;
1371
3c997079
MD		 1372 if (!event->registered)
1373 return 0;
1374
4ecb5ad5 1375 desc = event->desc;
38d024ae 1376 switch (event->instrumentation) {
ab2277d6 1377 case LTTNG_KERNEL_TRACEPOINT:
20591cf7 1378 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
85a9ca7f 1379 event->desc->probe_callback,
11b5a3c2 1380 event);
baf20995 1381 break;
ab2277d6 1382 case LTTNG_KERNEL_KPROBE:
8bf17deb 1383 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1384 ret = 0;
1385 break;
7371f44c
MD		 1386 case LTTNG_KERNEL_KRETPROBE:
1387 lttng_kretprobes_unregister(event);
1388 ret = 0;
1389 break;
33a39a3c 1390 case LTTNG_KERNEL_SYSCALL:
2d6d88c6 1391 ret = lttng_syscall_filter_disable_event(event->chan, event);
4ecb5ad5
MD		 1392 break;
1393 case LTTNG_KERNEL_NOOP:
259b6cb3
MD		 1394 ret = 0;
1395 break;
149b9a9d 1396 case LTTNG_KERNEL_UPROBE:
83b802dc 1397 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1398 ret = 0;
1399 break;
e884017c 1400 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
baf20995
MD		 1401 default:
1402 WARN_ON_ONCE(1);
1403 }
3c997079
MD		 1404 if (!ret)
1405 event->registered = 0;
dda6a249
MD		 1406 return ret;
1407}
1408
dffef45d
FD		 1409/* Only used for tracepoints for now. */
1410static
b01155ba 1411void register_event_notifier(struct lttng_event_notifier *event_notifier)
dffef45d
FD		 1412{
1413 const struct lttng_event_desc *desc;
1414 int ret = -EINVAL;
1415
1416 if (event_notifier->registered)
1417 return;
1418
1419 desc = event_notifier->desc;
1420 switch (event_notifier->instrumentation) {
1421 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1422 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1423 desc->event_notifier_callback,
1424 event_notifier);
1425 break;
8a8ac9a8
FD		 1426 case LTTNG_KERNEL_SYSCALL:
1427 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1428 break;
dffef45d 1429 case LTTNG_KERNEL_KPROBE:
9de67196 1430 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 1431 ret = 0;
1432 break;
dffef45d
FD		 1433 case LTTNG_KERNEL_KRETPROBE:
1434 case LTTNG_KERNEL_FUNCTION:
1435 case LTTNG_KERNEL_NOOP:
1436 default:
1437 WARN_ON_ONCE(1);
1438 }
1439 if (!ret)
1440 event_notifier->registered = 1;
1441}
1442
1443static
1444int _lttng_event_notifier_unregister(
1445 struct lttng_event_notifier *event_notifier)
1446{
1447 const struct lttng_event_desc *desc;
1448 int ret = -EINVAL;
1449
1450 if (!event_notifier->registered)
1451 return 0;
1452
1453 desc = event_notifier->desc;
1454 switch (event_notifier->instrumentation) {
1455 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1456 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname,
1457 event_notifier->desc->event_notifier_callback,
1458 event_notifier);
1459 break;
dffef45d 1460 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1461 lttng_kprobes_unregister_event_notifier(event_notifier);
1462 ret = 0;
1463 break;
9de67196
FD		 1464 case LTTNG_KERNEL_UPROBE:
1465 lttng_uprobes_unregister_event_notifier(event_notifier);
1466 ret = 0;
1467 break;
8a8ac9a8
FD		 1468 case LTTNG_KERNEL_SYSCALL:
1469 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1470 break;
dffef45d
FD		 1471 case LTTNG_KERNEL_KRETPROBE:
1472 case LTTNG_KERNEL_FUNCTION:
dffef45d 1473 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1474 default:
1475 WARN_ON_ONCE(1);
1476 }
1477 if (!ret)
1478 event_notifier->registered = 0;
1479 return ret;
1480}
1481
dda6a249
MD		 1482/*
1483 * Only used internally at session destruction.
1484 */
be066e6c 1485static
a90917c3 1486void _lttng_event_destroy(struct lttng_event *event)
dda6a249 1487{
edeb3137
MD		 1488 switch (event->instrumentation) {
1489 case LTTNG_KERNEL_TRACEPOINT:
0bcedee9 1490 lttng_event_desc_put(event->desc);
edeb3137
MD		 1491 break;
1492 case LTTNG_KERNEL_KPROBE:
1493 module_put(event->desc->owner);
8bf17deb 1494 lttng_kprobes_destroy_event_private(event);
edeb3137 1495 break;
7371f44c
MD		 1496 case LTTNG_KERNEL_KRETPROBE:
1497 module_put(event->desc->owner);
1498 lttng_kretprobes_destroy_private(event);
1499 break;
259b6cb3 1500 case LTTNG_KERNEL_NOOP:
33a39a3c 1501 case LTTNG_KERNEL_SYSCALL:
259b6cb3 1502 break;
149b9a9d
YB		 1503 case LTTNG_KERNEL_UPROBE:
1504 module_put(event->desc->owner);
83b802dc 1505 lttng_uprobes_destroy_event_private(event);
149b9a9d 1506 break;
e884017c 1507 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
edeb3137
MD		 1508 default:
1509 WARN_ON_ONCE(1);
1510 }
dda6a249 1511 list_del(&event->list);
8070f5c0 1512 lttng_destroy_context(event->ctx);
11b5a3c2 1513 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 1514}
1515
dffef45d
FD		 1516/*
1517 * Only used internally at session destruction.
1518 */
1519static
1520void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
1521{
1522 switch (event_notifier->instrumentation) {
1523 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1524 lttng_event_desc_put(event_notifier->desc);
1525 break;
dffef45d 1526 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1527 module_put(event_notifier->desc->owner);
1528 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1529 break;
8a8ac9a8
FD		 1530 case LTTNG_KERNEL_NOOP:
1531 case LTTNG_KERNEL_SYSCALL:
1532 break;
9de67196
FD		 1533 case LTTNG_KERNEL_UPROBE:
1534 module_put(event_notifier->desc->owner);
1535 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1536 break;
dffef45d
FD		 1537 case LTTNG_KERNEL_KRETPROBE:
1538 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 1539 default:
1540 WARN_ON_ONCE(1);
1541 }
1542 list_del(&event_notifier->list);
1543 kmem_cache_free(event_notifier_cache, event_notifier);
1544}
1545
d1f652f8
MD		 1546struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1547 enum tracker_type tracker_type)
e0130fab 1548{
d1f652f8
MD		 1549 switch (tracker_type) {
1550 case TRACKER_PID:
1551 return &session->pid_tracker;
1552 case TRACKER_VPID:
1553 return &session->vpid_tracker;
1554 case TRACKER_UID:
1555 return &session->uid_tracker;
1556 case TRACKER_VUID:
1557 return &session->vuid_tracker;
1558 case TRACKER_GID:
1559 return &session->gid_tracker;
1560 case TRACKER_VGID:
1561 return &session->vgid_tracker;
1562 default:
1563 WARN_ON_ONCE(1);
1564 return NULL;
1565 }
1566}
1567
1568int lttng_session_track_id(struct lttng_session *session,
1569 enum tracker_type tracker_type, int id)
1570{
1571 struct lttng_id_tracker *tracker;
e0130fab
MD		 1572 int ret;
1573
d1f652f8
MD		 1574 tracker = get_tracker(session, tracker_type);
1575 if (!tracker)
1576 return -EINVAL;
1577 if (id < -1)
e0130fab
MD		 1578 return -EINVAL;
1579 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1580 if (id == -1) {
1581 /* track all ids: destroy tracker. */
1582 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1583 ret = 0;
1584 } else {
d1f652f8 1585 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1586 }
e0130fab
MD		 1587 mutex_unlock(&sessions_mutex);
1588 return ret;
1589}
1590
d1f652f8
MD		 1591int lttng_session_untrack_id(struct lttng_session *session,
1592 enum tracker_type tracker_type, int id)
e0130fab 1593{
d1f652f8 1594 struct lttng_id_tracker *tracker;
e0130fab
MD		 1595 int ret;
1596
d1f652f8
MD		 1597 tracker = get_tracker(session, tracker_type);
1598 if (!tracker)
1599 return -EINVAL;
1600 if (id < -1)
e0130fab
MD		 1601 return -EINVAL;
1602 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1603 if (id == -1) {
1604 /* untrack all ids: replace by empty tracker. */
1605 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1606 } else {
d1f652f8 1607 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1608 }
e0130fab
MD		 1609 mutex_unlock(&sessions_mutex);
1610 return ret;
1611}
1612
7e6f9ef6 1613static
d1f652f8 1614void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1615{
d1f652f8
MD		 1616 struct lttng_id_tracker *id_tracker = m->private;
1617 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1618 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1619 int iter = 0, i;
1620
1621 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1622 if (id_tracker_p) {
1623 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1624 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1625
f934e302 1626 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1627 if (iter++ >= *pos)
1628 return e;
1629 }
1630 }
1631 } else {
d1f652f8 1632 /* ID tracker disabled. */
7e6f9ef6 1633 if (iter >= *pos && iter == 0) {
d1f652f8 1634 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1635 }
1636 iter++;
1637 }
1638 /* End of list */
1639 return NULL;
1640}
1641
1642/* Called with sessions_mutex held. */
1643static
d1f652f8 1644void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1645{
d1f652f8
MD		 1646 struct lttng_id_tracker *id_tracker = m->private;
1647 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1648 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1649 int iter = 0, i;
1650
1651 (*ppos)++;
d1f652f8
MD		 1652 if (id_tracker_p) {
1653 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1654 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1655
f934e302 1656 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1657 if (iter++ >= *ppos)
1658 return e;
1659 }
1660 }
1661 } else {
d1f652f8 1662 /* ID tracker disabled. */
7e6f9ef6 1663 if (iter >= *ppos && iter == 0)
d1f652f8 1664 return p; /* empty tracker */
7e6f9ef6
MD		 1665 iter++;
1666 }
1667
1668 /* End of list */
1669 return NULL;
1670}
1671
1672static
d1f652f8 1673void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1674{
1675 mutex_unlock(&sessions_mutex);
1676}
1677
1678static
d1f652f8 1679int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1680{
d1f652f8
MD		 1681 struct lttng_id_tracker *id_tracker = m->private;
1682 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1683 int id;
7e6f9ef6 1684
d1f652f8 1685 if (p == id_tracker_p) {
7e6f9ef6 1686 /* Tracker disabled. */
d1f652f8 1687 id = -1;
7e6f9ef6 1688 } else {
d1f652f8 1689 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1690
d1f652f8
MD		 1691 id = lttng_id_tracker_get_node_id(e);
1692 }
1693 switch (id_tracker->tracker_type) {
1694 case TRACKER_PID:
1695 seq_printf(m, "process { pid = %d; };\n", id);
1696 break;
1697 case TRACKER_VPID:
1698 seq_printf(m, "process { vpid = %d; };\n", id);
1699 break;
1700 case TRACKER_UID:
1701 seq_printf(m, "user { uid = %d; };\n", id);
1702 break;
1703 case TRACKER_VUID:
1704 seq_printf(m, "user { vuid = %d; };\n", id);
1705 break;
1706 case TRACKER_GID:
1707 seq_printf(m, "group { gid = %d; };\n", id);
1708 break;
1709 case TRACKER_VGID:
1710 seq_printf(m, "group { vgid = %d; };\n", id);
1711 break;
1712 default:
1713 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1714 }
7e6f9ef6
MD		 1715 return 0;
1716}
1717
1718static
d1f652f8
MD		 1719const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1720 .start = id_list_start,
1721 .next = id_list_next,
1722 .stop = id_list_stop,
1723 .show = id_list_show,
7e6f9ef6
MD		 1724};
1725
1726static
d1f652f8 1727int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1728{
d1f652f8 1729 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1730}
1731
1732static
d1f652f8 1733int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1734{
1735 struct seq_file *m = file->private_data;
d1f652f8 1736 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1737 int ret;
1738
d1f652f8 1739 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1740 ret = seq_release(inode, file);
d1f652f8
MD		 1741 if (!ret)
1742 fput(id_tracker->session->file);
7e6f9ef6
MD		 1743 return ret;
1744}
1745
d1f652f8 1746const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1747 .owner = THIS_MODULE,
d1f652f8 1748 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1749 .read = seq_read,
1750 .llseek = seq_lseek,
d1f652f8 1751 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1752};
1753
d1f652f8
MD		 1754int lttng_session_list_tracker_ids(struct lttng_session *session,
1755 enum tracker_type tracker_type)
7e6f9ef6 1756{
d1f652f8 1757 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1758 struct seq_file *m;
1759 int file_fd, ret;
1760
1761 file_fd = lttng_get_unused_fd();
1762 if (file_fd < 0) {
1763 ret = file_fd;
1764 goto fd_error;
1765 }
1766
d1f652f8
MD		 1767 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1768 &lttng_tracker_ids_list_fops,
7e6f9ef6 1769 NULL, O_RDWR);
d1f652f8
MD		 1770 if (IS_ERR(tracker_ids_list_file)) {
1771 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1772 goto file_error;
1773 }
98d7281c
MJ		 1774 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1775 ret = -EOVERFLOW;
9c1f4643
MD		 1776 goto refcount_error;
1777 }
d1f652f8 1778 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1779 if (ret < 0)
1780 goto open_error;
d1f652f8
MD		 1781 m = tracker_ids_list_file->private_data;
1782
1783 m->private = get_tracker(session, tracker_type);
1784 BUG_ON(!m->private);
1785 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1786
1787 return file_fd;
1788
1789open_error:
9c1f4643
MD		 1790 atomic_long_dec(&session->file->f_count);
1791refcount_error:
d1f652f8 1792 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1793file_error:
1794 put_unused_fd(file_fd);
1795fd_error:
1796 return ret;
1797}
1798
3c997079
MD		 1799/*
1800 * Enabler management.
1801 */
1802static
4993071a
PP		 1803int lttng_match_enabler_star_glob(const char *desc_name,
1804 const char *pattern)
3c997079 1805{
cbc19040
MD		 1806 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1807 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1808 return 0;
1809 return 1;
1810}
1811
1812static
4ecb5ad5
MD		 1813int lttng_match_enabler_name(const char *desc_name,
1814 const char *name)
3c997079 1815{
4ecb5ad5 1816 if (strcmp(desc_name, name))
3c997079
MD		 1817 return 0;
1818 return 1;
1819}
1820
3c997079
MD		 1821int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1822 struct lttng_enabler *enabler)
1823{
4ecb5ad5 1824 const char *desc_name, *enabler_name;
badfe9f5 1825 bool compat = false, entry = false;
4ecb5ad5
MD		 1826
1827 enabler_name = enabler->event_param.name;
1828 switch (enabler->event_param.instrumentation) {
1829 case LTTNG_KERNEL_TRACEPOINT:
1830 desc_name = desc->name;
3b861b22
FD		 1831 switch (enabler->format_type) {
1832 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1833 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1834 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1835 return lttng_match_enabler_name(desc_name, enabler_name);
1836 default:
1837 return -EINVAL;
1838 }
4ecb5ad5
MD		 1839 break;
1840 case LTTNG_KERNEL_SYSCALL:
1841 desc_name = desc->name;
badfe9f5 1842 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1843 desc_name += strlen("compat_");
badfe9f5
MD		 1844 compat = true;
1845 }
4ecb5ad5
MD		 1846 if (!strncmp(desc_name, "syscall_exit_",
1847 strlen("syscall_exit_"))) {
1848 desc_name += strlen("syscall_exit_");
1849 } else if (!strncmp(desc_name, "syscall_entry_",
1850 strlen("syscall_entry_"))) {
1851 desc_name += strlen("syscall_entry_");
badfe9f5 1852 entry = true;
4ecb5ad5
MD		 1853 } else {
1854 WARN_ON_ONCE(1);
1855 return -EINVAL;
1856 }
badfe9f5
MD		 1857 switch (enabler->event_param.u.syscall.entryexit) {
1858 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1859 break;
1860 case LTTNG_KERNEL_SYSCALL_ENTRY:
1861 if (!entry)
1862 return 0;
1863 break;
1864 case LTTNG_KERNEL_SYSCALL_EXIT:
1865 if (entry)
1866 return 0;
1867 break;
1868 default:
1869 return -EINVAL;
1870 }
1871 switch (enabler->event_param.u.syscall.abi) {
1872 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1873 break;
1874 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1875 if (compat)
1876 return 0;
1877 break;
1878 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1879 if (!compat)
1880 return 0;
1881 break;
1882 default:
1883 return -EINVAL;
1884 }
1885 switch (enabler->event_param.u.syscall.match) {
cff6938b 1886 case LTTNG_KERNEL_SYSCALL_MATCH_NAME:
3b861b22
FD		 1887 switch (enabler->format_type) {
1888 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1889 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1890 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1891 return lttng_match_enabler_name(desc_name, enabler_name);
1892 default:
1893 return -EINVAL;
1894 }
1895 break;
cff6938b 1896 case LTTNG_KERNEL_SYSCALL_MATCH_NR:
badfe9f5
MD		 1897 return -EINVAL; /* Not implemented. */
1898 default:
1899 return -EINVAL;
1900 }
4ecb5ad5
MD		 1901 break;
1902 default:
1903 WARN_ON_ONCE(1);
1904 return -EINVAL;
1905 }
3c997079
MD		 1906}
1907
1908static
b2bc0bc8
FD		 1909int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
1910 struct lttng_event *event)
3c997079 1911{
b2bc0bc8
FD		 1912 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
1913 event_enabler);
1914
1915 if (base_enabler->event_param.instrumentation != event->instrumentation)
33a39a3c 1916 return 0;
b2bc0bc8
FD		 1917 if (lttng_desc_match_enabler(event->desc, base_enabler)
1918 && event->chan == event_enabler->chan)
3c997079
MD		 1919 return 1;
1920 else
1921 return 0;
1922}
1923
b01155ba
FD		 1924static
1925int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
1926 struct lttng_event_notifier *event_notifier)
1927{
1928 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
1929 event_notifier_enabler);
1930
1931 if (base_enabler->event_param.instrumentation != event_notifier->instrumentation)
1932 return 0;
1933 if (lttng_desc_match_enabler(event_notifier->desc, base_enabler)
1934 && event_notifier->group == event_notifier_enabler->group
1935 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1936 return 1;
1937 else
1938 return 0;
1939}
1940
3c997079 1941static
b2bc0bc8
FD		 1942struct lttng_enabler_ref *lttng_enabler_ref(
1943 struct list_head *enablers_ref_list,
3c997079
MD		 1944 struct lttng_enabler *enabler)
1945{
1946 struct lttng_enabler_ref *enabler_ref;
1947
b2bc0bc8 1948 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 1949 if (enabler_ref->ref == enabler)
1950 return enabler_ref;
1951 }
1952 return NULL;
1953}
1954
3c997079 1955static
1b917d6b 1956void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 1957{
b2bc0bc8 1958 struct lttng_session *session = event_enabler->chan->session;
3c997079
MD		 1959 struct lttng_probe_desc *probe_desc;
1960 const struct lttng_event_desc *desc;
1961 int i;
1962 struct list_head *probe_list;
1963
1964 probe_list = lttng_get_probe_list_head();
1965 /*
1966 * For each probe event, if we find that a probe event matches
1967 * our enabler, create an associated lttng_event if not
1968 * already present.
1969 */
1970 list_for_each_entry(probe_desc, probe_list, head) {
1971 for (i = 0; i < probe_desc->nr_events; i++) {
1972 int found = 0;
1973 struct hlist_head *head;
3c997079
MD		 1974 struct lttng_event *event;
1975
1976 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 1977 if (!lttng_desc_match_enabler(desc,
1978 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 1979 continue;
3c997079
MD		 1980
1981 /*
1982 * Check if already created.
1983 */
4a11ef1c
FD		 1984 head = utils_borrow_hash_table_bucket(
1985 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
1986 desc->name);
d216ecae 1987 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079 1988 if (event->desc == desc
b2bc0bc8 1989 && event->chan == event_enabler->chan)
3c997079
MD		 1990 found = 1;
1991 }
1992 if (found)
1993 continue;
1994
1995 /*
1996 * We need to create an event for this
1997 * event probe.
1998 */
b2bc0bc8 1999 event = _lttng_event_create(event_enabler->chan,
3c997079
MD		 2000 NULL, NULL, desc,
2001 LTTNG_KERNEL_TRACEPOINT);
2002 if (!event) {
5a15f70c 2003 printk(KERN_INFO "LTTng: Unable to create event %s\n",
3c997079
MD		 2004 probe_desc->event_desc[i]->name);
2005 }
2006 }
2007 }
2008}
2009
b01155ba
FD		 2010static
2011void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2012{
2013 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2014 struct lttng_probe_desc *probe_desc;
2015 const struct lttng_event_desc *desc;
2016 int i;
2017 struct list_head *probe_list;
2018
2019 probe_list = lttng_get_probe_list_head();
2020 /*
2021 * For each probe event, if we find that a probe event matches
2022 * our enabler, create an associated lttng_event_notifier if not
2023 * already present.
2024 */
2025 list_for_each_entry(probe_desc, probe_list, head) {
2026 for (i = 0; i < probe_desc->nr_events; i++) {
2027 int found = 0;
2028 struct hlist_head *head;
2029 struct lttng_event_notifier *event_notifier;
2030
2031 desc = probe_desc->event_desc[i];
2032 if (!lttng_desc_match_enabler(desc,
2033 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
2034 continue;
2035
2036 /*
2037 * Check if already created.
2038 */
2039 head = utils_borrow_hash_table_bucket(
2040 event_notifier_group->event_notifiers_ht.table,
2041 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
2042 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
2043 if (event_notifier->desc == desc
2044 && event_notifier->user_token == event_notifier_enabler->base.user_token)
2045 found = 1;
2046 }
2047 if (found)
2048 continue;
2049
2050 /*
2051 * We need to create a event_notifier for this event probe.
2052 */
2053 event_notifier = _lttng_event_notifier_create(desc,
2054 event_notifier_enabler->base.user_token,
99f52fcc 2055 event_notifier_enabler->error_counter_index,
b01155ba
FD		 2056 event_notifier_group, NULL, NULL,
2057 LTTNG_KERNEL_TRACEPOINT);
2058 if (IS_ERR(event_notifier)) {
2059 printk(KERN_INFO "Unable to create event_notifier %s\n",
2060 probe_desc->event_desc[i]->name);
2061 }
2062 }
2063 }
2064}
2065
33a39a3c 2066static
1b917d6b 2067void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 2068{
2069 int ret;
2070
3b82c4e1 2071 ret = lttng_syscalls_register_event(event_enabler, NULL);
33a39a3c
MD		 2072 WARN_ON_ONCE(ret);
2073}
2074
8a8ac9a8
FD		 2075static
2076void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2077{
2078 int ret;
2079
2080 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL);
2081 WARN_ON_ONCE(ret);
2082 ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL);
2083 WARN_ON_ONCE(ret);
2084}
2085
33a39a3c
MD		 2086/*
2087 * Create struct lttng_event if it is missing and present in the list of
2088 * tracepoint probes.
2089 * Should be called with sessions mutex held.
2090 */
2091static
b2bc0bc8 2092void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 2093{
b2bc0bc8 2094 switch (event_enabler->base.event_param.instrumentation) {
33a39a3c 2095 case LTTNG_KERNEL_TRACEPOINT:
1b917d6b 2096 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c
MD		 2097 break;
2098 case LTTNG_KERNEL_SYSCALL:
1b917d6b 2099 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c
MD		 2100 break;
2101 default:
2102 WARN_ON_ONCE(1);
2103 break;
2104 }
2105}
2106
3c997079 2107/*
b2bc0bc8 2108 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 2109 * and add backward reference from the event to the enabler.
2110 * Should be called with sessions mutex held.
2111 */
2112static
b2bc0bc8 2113int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 2114{
b2bc0bc8
FD		 2115 struct lttng_channel *chan = event_enabler->chan;
2116 struct lttng_session *session = event_enabler->chan->session;
2117 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
3c997079
MD		 2118 struct lttng_event *event;
2119
b2bc0bc8 2120 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
b2bc0bc8 2121 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
cff6938b 2122 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
b2bc0bc8 2123 !strcmp(base_enabler->event_param.name, "*")) {
3b82c4e1
MD		 2124 int enabled = base_enabler->enabled;
2125 enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2126
2127 if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2128 WRITE_ONCE(chan->syscall_all_entry, enabled);
2129
2130 if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2131 WRITE_ONCE(chan->syscall_all_exit, enabled);
badfe9f5
MD		 2132 }
2133
3c997079 2134 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 2135 lttng_create_event_if_missing(event_enabler);
3c997079 2136
b2bc0bc8 2137 /* For each event matching event_enabler in session event list. */
3c997079
MD		 2138 list_for_each_entry(event, &session->events, list) {
2139 struct lttng_enabler_ref *enabler_ref;
2140
b2bc0bc8 2141 if (!lttng_event_enabler_match_event(event_enabler, event))
3c997079 2142 continue;
b2bc0bc8
FD		 2143 enabler_ref = lttng_enabler_ref(&event->enablers_ref_head,
2144 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 2145 if (!enabler_ref) {
2146 /*
2147 * If no backward ref, create it.
b2bc0bc8 2148 * Add backward ref from event to event_enabler.
3c997079
MD		 2149 */
2150 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2151 if (!enabler_ref)
2152 return -ENOMEM;
b2bc0bc8 2153 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079
MD		 2154 list_add(&enabler_ref->node,
2155 &event->enablers_ref_head);
2156 }
2157
f127e61e
MD		 2158 /*
2159 * Link filter bytecodes if not linked yet.
2160 */
2dfda770
FD		 2161 lttng_enabler_link_bytecode(event->desc,
2162 lttng_static_ctx,
183e8b3a 2163 &event->filter_bytecode_runtime_head,
60206944 2164 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
f127e61e 2165
3c997079
MD		 2166 /* TODO: merge event context. */
2167 }
2168 return 0;
2169}
2170
b01155ba
FD		 2171/*
2172 * Create struct lttng_event_notifier if it is missing and present in the list of
2173 * tracepoint probes.
2174 * Should be called with sessions mutex held.
2175 */
2176static
2177void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2178{
2179 switch (event_notifier_enabler->base.event_param.instrumentation) {
2180 case LTTNG_KERNEL_TRACEPOINT:
2181 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2182 break;
8a8ac9a8
FD		 2183 case LTTNG_KERNEL_SYSCALL:
2184 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2185 break;
b01155ba
FD		 2186 default:
2187 WARN_ON_ONCE(1);
2188 break;
2189 }
2190}
2191
2192/*
2193 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2194 */
2195static
8a8ac9a8
FD		 2196int lttng_event_notifier_enabler_ref_event_notifiers(
2197 struct lttng_event_notifier_enabler *event_notifier_enabler)
b01155ba
FD		 2198{
2199 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
8a8ac9a8 2200 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
b01155ba
FD		 2201 struct lttng_event_notifier *event_notifier;
2202
8a8ac9a8
FD		 2203 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
2204 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
2205 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
2206 !strcmp(base_enabler->event_param.name, "*")) {
2207
2208 int enabled = base_enabler->enabled;
2209 enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2210
2211 if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2212 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2213
2214 if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2215 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2216
2217 }
2218
b01155ba
FD		 2219 /* First ensure that probe event_notifiers are created for this enabler. */
2220 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2221
2222 /* Link the created event_notifier with its associated enabler. */
2223 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2224 struct lttng_enabler_ref *enabler_ref;
2225
2226 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2227 continue;
2228
2229 enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
2230 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2231 if (!enabler_ref) {
2232 /*
2233 * If no backward ref, create it.
2234 * Add backward ref from event_notifier to enabler.
2235 */
2236 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2237 if (!enabler_ref)
2238 return -ENOMEM;
2239
2240 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2241 event_notifier_enabler);
2242 list_add(&enabler_ref->node,
2243 &event_notifier->enablers_ref_head);
2244 }
2245
2246 /*
2247 * Link filter bytecodes if not linked yet.
2248 */
2249 lttng_enabler_link_bytecode(event_notifier->desc,
183e8b3a 2250 lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head,
60206944 2251 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
99d223ad
FD		 2252
2253 /* Link capture bytecodes if not linked yet. */
2254 lttng_enabler_link_bytecode(event_notifier->desc,
2255 lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head,
2256 &event_notifier_enabler->capture_bytecode_head);
2257
2258 event_notifier->num_captures = event_notifier_enabler->num_captures;
b01155ba
FD		 2259 }
2260 return 0;
2261}
2262
3c997079
MD		 2263/*
2264 * Called at module load: connect the probe on all enablers matching
2265 * this event.
2266 * Called with sessions lock held.
2267 */
2268int lttng_fix_pending_events(void)
2269{
2270 struct lttng_session *session;
2271
2272 list_for_each_entry(session, &sessions, list)
b2bc0bc8 2273 lttng_session_lazy_sync_event_enablers(session);
3c997079
MD		 2274 return 0;
2275}
2276
b01155ba
FD		 2277static bool lttng_event_notifier_group_has_active_event_notifiers(
2278 struct lttng_event_notifier_group *event_notifier_group)
2279{
2280 struct lttng_event_notifier_enabler *event_notifier_enabler;
2281
2282 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2283 node) {
2284 if (event_notifier_enabler->base.enabled)
2285 return true;
2286 }
2287 return false;
2288}
2289
2290bool lttng_event_notifier_active(void)
2291{
2292 struct lttng_event_notifier_group *event_notifier_group;
2293
2294 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2295 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2296 return true;
2297 }
2298 return false;
2299}
2300
2301int lttng_fix_pending_event_notifiers(void)
2302{
2303 struct lttng_event_notifier_group *event_notifier_group;
2304
2305 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2306 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2307 return 0;
2308}
2309
b2bc0bc8
FD		 2310struct lttng_event_enabler *lttng_event_enabler_create(
2311 enum lttng_enabler_format_type format_type,
3c997079
MD		 2312 struct lttng_kernel_event *event_param,
2313 struct lttng_channel *chan)
2314{
b2bc0bc8 2315 struct lttng_event_enabler *event_enabler;
3c997079 2316
b2bc0bc8
FD		 2317 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2318 if (!event_enabler)
3c997079 2319 return NULL;
b2bc0bc8
FD		 2320 event_enabler->base.format_type = format_type;
2321 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2322 memcpy(&event_enabler->base.event_param, event_param,
2323 sizeof(event_enabler->base.event_param));
2324 event_enabler->chan = chan;
3c997079 2325 /* ctx left NULL */
b2bc0bc8
FD		 2326 event_enabler->base.enabled = 0;
2327 event_enabler->base.evtype = LTTNG_TYPE_ENABLER;
3c997079 2328 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2329 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2330 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2331 mutex_unlock(&sessions_mutex);
b2bc0bc8 2332 return event_enabler;
3c997079
MD		 2333}
2334
b2bc0bc8 2335int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2336{
2337 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2338 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2339 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2340 mutex_unlock(&sessions_mutex);
2341 return 0;
2342}
2343
b2bc0bc8 2344int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2345{
2346 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2347 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2348 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2349 mutex_unlock(&sessions_mutex);
2350 return 0;
2351}
2352
b2bc0bc8 2353static
183e8b3a 2354int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
07dfc1d0
MD		 2355 struct lttng_kernel_filter_bytecode __user *bytecode)
2356{
89ec2b91 2357 struct lttng_bytecode_node *bytecode_node;
07dfc1d0
MD		 2358 uint32_t bytecode_len;
2359 int ret;
2360
2361 ret = get_user(bytecode_len, &bytecode->len);
2362 if (ret)
2363 return ret;
52cfcdf3 2364 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
07dfc1d0
MD		 2365 GFP_KERNEL);
2366 if (!bytecode_node)
2367 return -ENOMEM;
2368 ret = copy_from_user(&bytecode_node->bc, bytecode,
2369 sizeof(*bytecode) + bytecode_len);
2370 if (ret)
2371 goto error_free;
b2bc0bc8 2372
89ec2b91 2373 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER;
07dfc1d0
MD		 2374 bytecode_node->enabler = enabler;
2375 /* Enforce length based on allocated size */
2376 bytecode_node->bc.len = bytecode_len;
2377 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2378
07dfc1d0
MD		 2379 return 0;
2380
2381error_free:
52cfcdf3 2382 lttng_kvfree(bytecode_node);
07dfc1d0
MD		 2383 return ret;
2384}
2385
183e8b3a 2386int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
b2bc0bc8
FD		 2387 struct lttng_kernel_filter_bytecode __user *bytecode)
2388{
2389 int ret;
183e8b3a 2390 ret = lttng_enabler_attach_filter_bytecode(
b2bc0bc8
FD		 2391 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2392 if (ret)
2393 goto error;
2394
2395 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2396 return 0;
2397
2398error:
2399 return ret;
2400}
2401
3aed4dca
FD		 2402int lttng_event_add_callsite(struct lttng_event *event,
2403 struct lttng_kernel_event_callsite __user *callsite)
2404{
2405
2406 switch (event->instrumentation) {
2407 case LTTNG_KERNEL_UPROBE:
83b802dc 2408 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2409 default:
2410 return -EINVAL;
2411 }
2412}
2413
b2bc0bc8 2414int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler,
3c997079
MD		 2415 struct lttng_kernel_context *context_param)
2416{
2417 return -ENOSYS;
2418}
2419
2420static
2421void lttng_enabler_destroy(struct lttng_enabler *enabler)
2422{
89ec2b91 2423 struct lttng_bytecode_node *filter_node, *tmp_filter_node;
07dfc1d0
MD		 2424
2425 /* Destroy filter bytecode */
2426 list_for_each_entry_safe(filter_node, tmp_filter_node,
2427 &enabler->filter_bytecode_head, node) {
52cfcdf3 2428 lttng_kvfree(filter_node);
07dfc1d0 2429 }
b2bc0bc8
FD		 2430}
2431
2432static
2433void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2434{
2435 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2436
3c997079 2437 /* Destroy contexts */
b2bc0bc8 2438 lttng_destroy_context(event_enabler->ctx);
3c997079 2439
b2bc0bc8
FD		 2440 list_del(&event_enabler->node);
2441 kfree(event_enabler);
3c997079
MD		 2442}
2443
dffef45d
FD		 2444struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2445 struct lttng_event_notifier_group *event_notifier_group,
2446 enum lttng_enabler_format_type format_type,
2447 struct lttng_kernel_event_notifier *event_notifier_param)
2448{
2449 struct lttng_event_notifier_enabler *event_notifier_enabler;
2450
2451 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2452 if (!event_notifier_enabler)
2453 return NULL;
2454
2455 event_notifier_enabler->base.format_type = format_type;
2456 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
99d223ad
FD		 2457 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2458
99f52fcc 2459 event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
99d223ad 2460 event_notifier_enabler->num_captures = 0;
dffef45d 2461
8a8ac9a8
FD		 2462 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2463 sizeof(event_notifier_enabler->base.event_param));
dffef45d
FD		 2464 event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER;
2465
2466 event_notifier_enabler->base.enabled = 0;
2467 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2468 event_notifier_enabler->group = event_notifier_group;
2469
2470 mutex_lock(&sessions_mutex);
2471 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2472 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2473
2474 mutex_unlock(&sessions_mutex);
2475
2476 return event_notifier_enabler;
2477}
2478
2479int lttng_event_notifier_enabler_enable(
2480 struct lttng_event_notifier_enabler *event_notifier_enabler)
2481{
2482 mutex_lock(&sessions_mutex);
2483 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2484 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2485 mutex_unlock(&sessions_mutex);
2486 return 0;
2487}
2488
2489int lttng_event_notifier_enabler_disable(
2490 struct lttng_event_notifier_enabler *event_notifier_enabler)
2491{
2492 mutex_lock(&sessions_mutex);
2493 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2494 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2495 mutex_unlock(&sessions_mutex);
2496 return 0;
2497}
2498
183e8b3a 2499int lttng_event_notifier_enabler_attach_filter_bytecode(
dffef45d
FD		 2500 struct lttng_event_notifier_enabler *event_notifier_enabler,
2501 struct lttng_kernel_filter_bytecode __user *bytecode)
2502{
2503 int ret;
2504
183e8b3a 2505 ret = lttng_enabler_attach_filter_bytecode(
dffef45d
FD		 2506 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2507 bytecode);
2508 if (ret)
2509 goto error;
2510
b01155ba 2511 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2512 return 0;
2513
2514error:
2515 return ret;
2516}
2517
99d223ad
FD		 2518int lttng_event_notifier_enabler_attach_capture_bytecode(
2519 struct lttng_event_notifier_enabler *event_notifier_enabler,
2520 struct lttng_kernel_capture_bytecode __user *bytecode)
2521{
2522 struct lttng_bytecode_node *bytecode_node;
2523 struct lttng_enabler *enabler =
2524 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2525 uint32_t bytecode_len;
2526 int ret;
2527
2528 ret = get_user(bytecode_len, &bytecode->len);
2529 if (ret)
2530 return ret;
2531
2532 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2533 GFP_KERNEL);
2534 if (!bytecode_node)
2535 return -ENOMEM;
2536
2537 ret = copy_from_user(&bytecode_node->bc, bytecode,
2538 sizeof(*bytecode) + bytecode_len);
2539 if (ret)
2540 goto error_free;
2541
2542 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE;
2543 bytecode_node->enabler = enabler;
2544
2545 /* Enforce length based on allocated size */
2546 bytecode_node->bc.len = bytecode_len;
2547 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2548
2549 event_notifier_enabler->num_captures++;
2550
2551 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2552 goto end;
2553
2554error_free:
2555 lttng_kvfree(bytecode_node);
2556end:
2557 return ret;
2558}
2559
9de67196
FD		 2560int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
2561 struct lttng_kernel_event_callsite __user *callsite)
2562{
2563
2564 switch (event_notifier->instrumentation) {
2565 case LTTNG_KERNEL_UPROBE:
2566 return lttng_uprobes_event_notifier_add_callsite(event_notifier,
2567 callsite);
2568 default:
2569 return -EINVAL;
2570 }
2571}
2572
dffef45d
FD		 2573int lttng_event_notifier_enabler_attach_context(
2574 struct lttng_event_notifier_enabler *event_notifier_enabler,
2575 struct lttng_kernel_context *context_param)
2576{
2577 return -ENOSYS;
2578}
2579
2580static
2581void lttng_event_notifier_enabler_destroy(
2582 struct lttng_event_notifier_enabler *event_notifier_enabler)
2583{
2584 if (!event_notifier_enabler) {
2585 return;
2586 }
2587
2588 list_del(&event_notifier_enabler->node);
2589
2590 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2591 kfree(event_notifier_enabler);
2592}
2593
3c997079 2594/*
b2bc0bc8 2595 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2596 * session.
2597 * Should be called with sessions mutex held.
2598 */
2599static
b2bc0bc8 2600void lttng_session_sync_event_enablers(struct lttng_session *session)
3c997079 2601{
b2bc0bc8 2602 struct lttng_event_enabler *event_enabler;
3c997079
MD		 2603 struct lttng_event *event;
2604
b2bc0bc8
FD		 2605 list_for_each_entry(event_enabler, &session->enablers_head, node)
2606 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2607 /*
2608 * For each event, if at least one of its enablers is enabled,
2609 * and its channel and session transient states are enabled, we
2610 * enable the event, else we disable it.
2611 */
2612 list_for_each_entry(event, &session->events, list) {
2613 struct lttng_enabler_ref *enabler_ref;
07dfc1d0
MD		 2614 struct lttng_bytecode_runtime *runtime;
2615 int enabled = 0, has_enablers_without_bytecode = 0;
3c997079 2616
4ecb5ad5
MD		 2617 switch (event->instrumentation) {
2618 case LTTNG_KERNEL_TRACEPOINT:
2619 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 2620 /* Enable events */
2621 list_for_each_entry(enabler_ref,
2622 &event->enablers_ref_head, node) {
2623 if (enabler_ref->ref->enabled) {
2624 enabled = 1;
2625 break;
2626 }
2627 }
4ecb5ad5
MD		 2628 break;
2629 default:
3c997079
MD		 2630 /* Not handled with lazy sync. */
2631 continue;
2632 }
2633 /*
2634 * Enabled state is based on union of enablers, with
2635 * intesection of session and channel transient enable
2636 * states.
2637 */
2638 enabled = enabled && session->tstate && event->chan->tstate;
2639
a8f2d0c7 2640 WRITE_ONCE(event->enabled, enabled);
3c997079
MD		 2641 /*
2642 * Sync tracepoint registration with event enabled
2643 * state.
2644 */
2645 if (enabled) {
2646 register_event(event);
2647 } else {
2648 _lttng_event_unregister(event);
2649 }
07dfc1d0
MD		 2650
2651 /* Check if has enablers without bytecode enabled */
2652 list_for_each_entry(enabler_ref,
2653 &event->enablers_ref_head, node) {
2654 if (enabler_ref->ref->enabled
2655 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2656 has_enablers_without_bytecode = 1;
2657 break;
2658 }
2659 }
2660 event->has_enablers_without_bytecode =
2661 has_enablers_without_bytecode;
2662
2663 /* Enable filters */
2664 list_for_each_entry(runtime,
183e8b3a 2665 &event->filter_bytecode_runtime_head, node)
0b365677 2666 lttng_bytecode_filter_sync_state(runtime);
3c997079
MD		 2667 }
2668}
2669
2670/*
2671 * Apply enablers to session events, adding events to session if need
2672 * be. It is required after each modification applied to an active
2673 * session, and right before session "start".
2674 * "lazy" sync means we only sync if required.
2675 * Should be called with sessions mutex held.
2676 */
2677static
b2bc0bc8 2678void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
3c997079
MD		 2679{
2680 /* We can skip if session is not active */
2681 if (!session->active)
2682 return;
b2bc0bc8 2683 lttng_session_sync_event_enablers(session);
3c997079
MD		 2684}
2685
b01155ba
FD		 2686static
2687void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2688{
2689 struct lttng_event_notifier_enabler *event_notifier_enabler;
2690 struct lttng_event_notifier *event_notifier;
2691
2692 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2693 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2694
2695 /*
2696 * For each event_notifier, if at least one of its enablers is enabled,
2697 * we enable the event_notifier, else we disable it.
2698 */
2699 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2700 struct lttng_enabler_ref *enabler_ref;
2701 struct lttng_bytecode_runtime *runtime;
2702 int enabled = 0, has_enablers_without_bytecode = 0;
2703
2704 switch (event_notifier->instrumentation) {
2705 case LTTNG_KERNEL_TRACEPOINT:
2706 case LTTNG_KERNEL_SYSCALL:
2707 /* Enable event_notifiers */
2708 list_for_each_entry(enabler_ref,
2709 &event_notifier->enablers_ref_head, node) {
2710 if (enabler_ref->ref->enabled) {
2711 enabled = 1;
2712 break;
2713 }
2714 }
2715 break;
2716 default:
2717 /* Not handled with sync. */
2718 continue;
2719 }
2720
2721 WRITE_ONCE(event_notifier->enabled, enabled);
2722 /*
2723 * Sync tracepoint registration with event_notifier enabled
2724 * state.
2725 */
2726 if (enabled) {
2727 if (!event_notifier->registered)
2728 register_event_notifier(event_notifier);
2729 } else {
2730 if (event_notifier->registered)
2731 _lttng_event_notifier_unregister(event_notifier);
2732 }
2733
2734 /* Check if has enablers without bytecode enabled */
2735 list_for_each_entry(enabler_ref,
2736 &event_notifier->enablers_ref_head, node) {
2737 if (enabler_ref->ref->enabled
2738 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2739 has_enablers_without_bytecode = 1;
2740 break;
2741 }
2742 }
2743 event_notifier->has_enablers_without_bytecode =
2744 has_enablers_without_bytecode;
2745
2746 /* Enable filters */
2747 list_for_each_entry(runtime,
183e8b3a 2748 &event_notifier->filter_bytecode_runtime_head, node)
0b365677 2749 lttng_bytecode_filter_sync_state(runtime);
99d223ad
FD		 2750
2751 /* Enable captures */
2752 list_for_each_entry(runtime,
2753 &event_notifier->capture_bytecode_runtime_head, node)
2754 lttng_bytecode_capture_sync_state(runtime);
b01155ba
FD		 2755 }
2756}
2757
1ec3f75a 2758/*
d83004aa
JD		 2759 * Serialize at most one packet worth of metadata into a metadata
2760 * channel.
92d9f5e6
MD		 2761 * We grab the metadata cache mutex to get exclusive access to our metadata
2762 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2763 * allows us to do racy operations such as looking for remaining space left in
2764 * packet and write, since mutual exclusion protects us from concurrent writes.
2765 * Mutual exclusion on the metadata cache allow us to read the cache content
2766 * without racing against reallocation of the cache by updates.
35097f36
JD		 2767 * Returns the number of bytes written in the channel, 0 if no data
2768 * was written and a negative value on error.
1ec3f75a 2769 */
b3b8072b 2770int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2771 struct channel *chan, bool *coherent)
d83004aa
JD		 2772{
2773 struct lib_ring_buffer_ctx ctx;
2774 int ret = 0;
2775 size_t len, reserve_len;
2776
f613e3e6 2777 /*
92d9f5e6
MD		 2778 * Ensure we support mutiple get_next / put sequences followed by
2779 * put_next. The metadata cache lock protects reading the metadata
2780 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2781 * "flush" operations on the buffer invoked by different processes.
2782 * Moreover, since the metadata cache memory can be reallocated, we
2783 * need to have exclusive access against updates even though we only
2784 * read it.
f613e3e6 2785 */
92d9f5e6 2786 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2787 WARN_ON(stream->metadata_in < stream->metadata_out);
2788 if (stream->metadata_in != stream->metadata_out)
de23d59d 2789 goto end;
f613e3e6 2790
9616f0bf
JD		 2791 /* Metadata regenerated, change the version. */
2792 if (stream->metadata_cache->version != stream->version)
2793 stream->version = stream->metadata_cache->version;
2794
d83004aa 2795 len = stream->metadata_cache->metadata_written -
f613e3e6 2796 stream->metadata_in;
9de2c215 2797 if (!len)
de23d59d 2798 goto end;
d83004aa 2799 reserve_len = min_t(size_t,
b3b8072b 2800 stream->transport->ops.packet_avail_size(chan),
d83004aa 2801 len);
b3b8072b 2802 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
d83004aa
JD		 2803 sizeof(char), -1);
2804 /*
2805 * If reservation failed, return an error to the caller.
2806 */
b3b8072b 2807 ret = stream->transport->ops.event_reserve(&ctx, 0);
d83004aa
JD		 2808 if (ret != 0) {
2809 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2810 stream->coherent = false;
d83004aa
JD		 2811 goto end;
2812 }
b3b8072b 2813 stream->transport->ops.event_write(&ctx,
f613e3e6 2814 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2815 reserve_len);
b3b8072b 2816 stream->transport->ops.event_commit(&ctx);
f613e3e6 2817 stream->metadata_in += reserve_len;
3e75e2a7 2818 if (reserve_len < len)
8b97fd42
MD		 2819 stream->coherent = false;
2820 else
2821 stream->coherent = true;
d83004aa
JD		 2822 ret = reserve_len;
2823
2824end:
8b97fd42
MD		 2825 if (coherent)
2826 *coherent = stream->coherent;
92d9f5e6 2827 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2828 return ret;
2829}
2830
8b97fd42
MD		 2831static
2832void lttng_metadata_begin(struct lttng_session *session)
2833{
3e75e2a7
MD		 2834 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2835 mutex_lock(&session->metadata_cache->lock);
8b97fd42
MD		 2836}
2837
2838static
2839void lttng_metadata_end(struct lttng_session *session)
2840{
3e75e2a7
MD		 2841 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2842 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2843 struct lttng_metadata_stream *stream;
2844
3e75e2a7
MD		 2845 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2846 wake_up_interruptible(&stream->read_wait);
92143b2c 2847 mutex_unlock(&session->metadata_cache->lock);
3e75e2a7 2848 }
8b97fd42
MD		 2849}
2850
d83004aa
JD		 2851/*
2852 * Write the metadata to the metadata cache.
2853 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2854 * The metadata cache lock protects us from concurrent read access from
2855 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2856 * The content of the printf is printed as a single atomic metadata
2857 * transaction.
d83004aa 2858 */
a90917c3 2859int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 2860 const char *fmt, ...)
2861{
c099397a 2862 char *str;
d83004aa 2863 size_t len;
c099397a
MD		 2864 va_list ap;
2865
585e5dcc 2866 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2867
2868 va_start(ap, fmt);
2869 str = kvasprintf(GFP_KERNEL, fmt, ap);
2870 va_end(ap);
2871 if (!str)
2872 return -ENOMEM;
2873
1ec3f75a 2874 len = strlen(str);
3e75e2a7 2875 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 2876 if (session->metadata_cache->metadata_written + len >
2877 session->metadata_cache->cache_alloc) {
2878 char *tmp_cache_realloc;
2879 unsigned int tmp_cache_alloc_size;
2880
2881 tmp_cache_alloc_size = max_t(unsigned int,
2882 session->metadata_cache->cache_alloc + len,
2883 session->metadata_cache->cache_alloc << 1);
0ca42eb7 2884 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2885 if (!tmp_cache_realloc)
2886 goto err;
a606b6e8
ML		 2887 if (session->metadata_cache->data) {
2888 memcpy(tmp_cache_realloc,
2889 session->metadata_cache->data,
2890 session->metadata_cache->cache_alloc);
2891 vfree(session->metadata_cache->data);
2892 }
2893
d83004aa
JD		 2894 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2895 session->metadata_cache->data = tmp_cache_realloc;
c099397a 2896 }
d83004aa
JD		 2897 memcpy(session->metadata_cache->data +
2898 session->metadata_cache->metadata_written,
2899 str, len);
2900 session->metadata_cache->metadata_written += len;
c099397a 2901 kfree(str);
d83004aa 2902
d83004aa
JD		 2903 return 0;
2904
2905err:
2906 kfree(str);
2907 return -ENOMEM;
c099397a
MD		 2908}
2909
f513b2bf
MD		 2910static
2911int print_tabs(struct lttng_session *session, size_t nesting)
2912{
2913 size_t i;
2914
2915 for (i = 0; i < nesting; i++) {
2916 int ret;
2917
2918 ret = lttng_metadata_printf(session, " ");
2919 if (ret) {
2920 return ret;
2921 }
2922 }
2923 return 0;
2924}
2925
ceabb767
MD		 2926static
2927int lttng_field_name_statedump(struct lttng_session *session,
2928 const struct lttng_event_field *field,
2929 size_t nesting)
2930{
2931 return lttng_metadata_printf(session, " _%s;\n", field->name);
2932}
2933
2934static
2935int _lttng_integer_type_statedump(struct lttng_session *session,
2936 const struct lttng_type *type,
2937 size_t nesting)
2938{
2939 int ret;
2940
2941 WARN_ON_ONCE(type->atype != atype_integer);
2942 ret = print_tabs(session, nesting);
2943 if (ret)
2944 return ret;
2945 ret = lttng_metadata_printf(session,
2946 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2947 type->u.integer.size,
2948 type->u.integer.alignment,
2949 type->u.integer.signedness,
2950 (type->u.integer.encoding == lttng_encode_none)
2951 ? "none"
2952 : (type->u.integer.encoding == lttng_encode_UTF8)
2953 ? "UTF8"
2954 : "ASCII",
2955 type->u.integer.base,
2956#if __BYTE_ORDER == __BIG_ENDIAN
2957 type->u.integer.reverse_byte_order ? " byte_order = le;" : ""
2958#else
2959 type->u.integer.reverse_byte_order ? " byte_order = be;" : ""
2960#endif
2961 );
2962 return ret;
2963}
2964
f513b2bf
MD		 2965/*
2966 * Must be called with sessions_mutex held.
2967 */
2968static
2969int _lttng_struct_type_statedump(struct lttng_session *session,
2970 const struct lttng_type *type,
2971 size_t nesting)
2972{
2973 int ret;
2974 uint32_t i, nr_fields;
ceabb767
MD		 2975 unsigned int alignment;
2976
2977 WARN_ON_ONCE(type->atype != atype_struct_nestable);
f513b2bf
MD		 2978
2979 ret = print_tabs(session, nesting);
2980 if (ret)
2981 return ret;
2982 ret = lttng_metadata_printf(session,
2983 "struct {\n");
2984 if (ret)
2985 return ret;
ceabb767 2986 nr_fields = type->u.struct_nestable.nr_fields;
f513b2bf
MD		 2987 for (i = 0; i < nr_fields; i++) {
2988 const struct lttng_event_field *iter_field;
2989
ceabb767 2990 iter_field = &type->u.struct_nestable.fields[i];
f513b2bf
MD		 2991 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2992 if (ret)
2993 return ret;
2994 }
2995 ret = print_tabs(session, nesting);
2996 if (ret)
2997 return ret;
ceabb767
MD		 2998 alignment = type->u.struct_nestable.alignment;
2999 if (alignment) {
3000 ret = lttng_metadata_printf(session,
3001 "} align(%u)",
3002 alignment);
3003 } else {
3004 ret = lttng_metadata_printf(session,
3005 "}");
3006 }
f513b2bf
MD		 3007 return ret;
3008}
3009
3010/*
3011 * Must be called with sessions_mutex held.
3012 */
3013static
ceabb767 3014int _lttng_struct_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3015 const struct lttng_event_field *field,
3016 size_t nesting)
3017{
3018 int ret;
3019
3020 ret = _lttng_struct_type_statedump(session,
3021 &field->type, nesting);
3022 if (ret)
3023 return ret;
ceabb767 3024 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 3025}
3026
65c85aa6
MD		 3027/*
3028 * Must be called with sessions_mutex held.
3029 */
3030static
3031int _lttng_variant_type_statedump(struct lttng_session *session,
3032 const struct lttng_type *type,
3033 size_t nesting)
3034{
3035 int ret;
3036 uint32_t i, nr_choices;
3037
ceabb767
MD		 3038 WARN_ON_ONCE(type->atype != atype_variant_nestable);
3039 /*
3040 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3041 */
3042 if (type->u.variant_nestable.alignment != 0)
3043 return -EINVAL;
65c85aa6
MD		 3044 ret = print_tabs(session, nesting);
3045 if (ret)
3046 return ret;
3047 ret = lttng_metadata_printf(session,
3048 "variant <_%s> {\n",
ceabb767 3049 type->u.variant_nestable.tag_name);
65c85aa6
MD		 3050 if (ret)
3051 return ret;
ceabb767 3052 nr_choices = type->u.variant_nestable.nr_choices;
65c85aa6
MD		 3053 for (i = 0; i < nr_choices; i++) {
3054 const struct lttng_event_field *iter_field;
3055
ceabb767 3056 iter_field = &type->u.variant_nestable.choices[i];
65c85aa6
MD		 3057 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
3058 if (ret)
3059 return ret;
3060 }
3061 ret = print_tabs(session, nesting);
3062 if (ret)
3063 return ret;
3064 ret = lttng_metadata_printf(session,
3065 "}");
3066 return ret;
3067}
3068
3069/*
3070 * Must be called with sessions_mutex held.
3071 */
3072static
ceabb767 3073int _lttng_variant_field_statedump(struct lttng_session *session,
65c85aa6
MD		 3074 const struct lttng_event_field *field,
3075 size_t nesting)
3076{
3077 int ret;
3078
3079 ret = _lttng_variant_type_statedump(session,
3080 &field->type, nesting);
3081 if (ret)
3082 return ret;
ceabb767 3083 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 3084}
3085
f513b2bf
MD		 3086/*
3087 * Must be called with sessions_mutex held.
3088 */
3089static
ceabb767 3090int _lttng_array_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3091 const struct lttng_event_field *field,
3092 size_t nesting)
3093{
3094 int ret;
3095 const struct lttng_type *elem_type;
3096
ceabb767
MD		 3097 WARN_ON_ONCE(field->type.atype != atype_array_nestable);
3098
3099 if (field->type.u.array_nestable.alignment) {
3100 ret = print_tabs(session, nesting);
f513b2bf
MD		 3101 if (ret)
3102 return ret;
ceabb767
MD		 3103 ret = lttng_metadata_printf(session,
3104 "struct { } align(%u) _%s_padding;\n",
3105 field->type.u.array_nestable.alignment * CHAR_BIT,
3106 field->name);
3107 if (ret)
3108 return ret;
3109 }
3110 /*
3111 * Nested compound types: Only array of structures and variants are
3112 * currently supported.
3113 */
3114 elem_type = field->type.u.array_nestable.elem_type;
3115 switch (elem_type->atype) {
3116 case atype_integer:
3117 case atype_struct_nestable:
3118 case atype_variant_nestable:
3119 ret = _lttng_type_statedump(session, elem_type, nesting);
65c85aa6
MD		 3120 if (ret)
3121 return ret;
3122 break;
ceabb767 3123
f513b2bf
MD		 3124 default:
3125 return -EINVAL;
3126 }
3127 ret = lttng_metadata_printf(session,
3128 " _%s[%u];\n",
3129 field->name,
ceabb767 3130 field->type.u.array_nestable.length);
f513b2bf
MD		 3131 return ret;
3132}
3133
3134/*
3135 * Must be called with sessions_mutex held.
3136 */
3137static
ceabb767 3138int _lttng_sequence_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3139 const struct lttng_event_field *field,
3140 size_t nesting)
3141{
3142 int ret;
3143 const char *length_name;
3144 const struct lttng_type *elem_type;
3145
ceabb767 3146 WARN_ON_ONCE(field->type.atype != atype_sequence_nestable);
f513b2bf 3147
ceabb767
MD		 3148 length_name = field->type.u.sequence_nestable.length_name;
3149
3150 if (field->type.u.sequence_nestable.alignment) {
3151 ret = print_tabs(session, nesting);
f513b2bf
MD		 3152 if (ret)
3153 return ret;
ceabb767
MD		 3154 ret = lttng_metadata_printf(session,
3155 "struct { } align(%u) _%s_padding;\n",
3156 field->type.u.sequence_nestable.alignment * CHAR_BIT,
3157 field->name);
3158 if (ret)
3159 return ret;
3160 }
3161
3162 /*
3163 * Nested compound types: Only array of structures and variants are
3164 * currently supported.
3165 */
3166 elem_type = field->type.u.sequence_nestable.elem_type;
3167 switch (elem_type->atype) {
3168 case atype_integer:
3169 case atype_struct_nestable:
3170 case atype_variant_nestable:
3171 ret = _lttng_type_statedump(session, elem_type, nesting);
65c85aa6
MD		 3172 if (ret)
3173 return ret;
3174 break;
ceabb767 3175
f513b2bf
MD		 3176 default:
3177 return -EINVAL;
3178 }
3179 ret = lttng_metadata_printf(session,
3180 " _%s[ _%s ];\n",
3181 field->name,
ceabb767 3182 field->type.u.sequence_nestable.length_name);
f513b2bf
MD		 3183 return ret;
3184}
3185
141ddf28
MD		 3186/*
3187 * Must be called with sessions_mutex held.
3188 */
3189static
ceabb767
MD		 3190int _lttng_enum_type_statedump(struct lttng_session *session,
3191 const struct lttng_type *type,
141ddf28
MD		 3192 size_t nesting)
3193{
3194 const struct lttng_enum_desc *enum_desc;
ceabb767 3195 const struct lttng_type *container_type;
141ddf28
MD		 3196 int ret;
3197 unsigned int i, nr_entries;
3198
ceabb767
MD		 3199 container_type = type->u.enum_nestable.container_type;
3200 if (container_type->atype != atype_integer) {
3201 ret = -EINVAL;
3202 goto end;
3203 }
3204 enum_desc = type->u.enum_nestable.desc;
141ddf28
MD		 3205 nr_entries = enum_desc->nr_entries;
3206
3207 ret = print_tabs(session, nesting);
3208 if (ret)
3209 goto end;
ceabb767
MD		 3210 ret = lttng_metadata_printf(session, "enum : ");
3211 if (ret)
3212 goto end;
3213 ret = _lttng_integer_type_statedump(session, container_type, 0);
141ddf28 3214 if (ret)
ceabb767
MD		 3215 goto end;
3216 ret = lttng_metadata_printf(session, " {\n");
3217 if (ret)
3218 goto end;
141ddf28
MD		 3219 /* Dump all entries */
3220 for (i = 0; i < nr_entries; i++) {
3221 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
3222 int j, len;
3223
3224 ret = print_tabs(session, nesting + 1);
3225 if (ret)
3226 goto end;
3227 ret = lttng_metadata_printf(session,
3228 "\"");
3229 if (ret)
3230 goto end;
3231 len = strlen(entry->string);
3232 /* Escape the character '"' */
3233 for (j = 0; j < len; j++) {
3234 char c = entry->string[j];
3235
3236 switch (c) {
3237 case '"':
3238 ret = lttng_metadata_printf(session,
3239 "\\\"");
3240 break;
3241 case '\\':
3242 ret = lttng_metadata_printf(session,
3243 "\\\\");
3244 break;
3245 default:
3246 ret = lttng_metadata_printf(session,
3247 "%c", c);
3248 break;
3249 }
3250 if (ret)
3251 goto end;
3252 }
08ad1061
PP		 3253 ret = lttng_metadata_printf(session, "\"");
3254 if (ret)
3255 goto end;
3256
3257 if (entry->options.is_auto) {
3258 ret = lttng_metadata_printf(session, ",\n");
3259 if (ret)
3260 goto end;
141ddf28 3261 } else {
7c559490
MD		 3262 ret = lttng_metadata_printf(session,
3263 " = ");
3264 if (ret)
3265 goto end;
3266 if (entry->start.signedness)
141ddf28 3267 ret = lttng_metadata_printf(session,
7c559490
MD		 3268 "%lld", (long long) entry->start.value);
3269 else
3270 ret = lttng_metadata_printf(session,
3271 "%llu", entry->start.value);
3272 if (ret)
3273 goto end;
3274 if (entry->start.signedness == entry->end.signedness &&
3275 entry->start.value
3276 == entry->end.value) {
141ddf28 3277 ret = lttng_metadata_printf(session,
7c559490
MD		 3278 ",\n");
3279 } else {
3280 if (entry->end.signedness) {
3281 ret = lttng_metadata_printf(session,
3282 " ... %lld,\n",
3283 (long long) entry->end.value);
3284 } else {
3285 ret = lttng_metadata_printf(session,
3286 " ... %llu,\n",
3287 entry->end.value);
3288 }
141ddf28 3289 }
7c559490
MD		 3290 if (ret)
3291 goto end;
141ddf28 3292 }
141ddf28
MD		 3293 }
3294 ret = print_tabs(session, nesting);
3295 if (ret)
3296 goto end;
ceabb767 3297 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3298end:
3299 return ret;
3300}
3301
d83004aa
JD		 3302/*
3303 * Must be called with sessions_mutex held.
3304 */
c099397a 3305static
ceabb767
MD		 3306int _lttng_enum_field_statedump(struct lttng_session *session,
3307 const struct lttng_event_field *field,
3308 size_t nesting)
3309{
3310 int ret;
3311
3312 ret = _lttng_enum_type_statedump(session, &field->type, nesting);
3313 if (ret)
3314 return ret;
3315 return lttng_field_name_statedump(session, field, nesting);
3316}
3317
3318static
3319int _lttng_integer_field_statedump(struct lttng_session *session,
3320 const struct lttng_event_field *field,
3321 size_t nesting)
3322{
3323 int ret;
3324
3325 ret = _lttng_integer_type_statedump(session, &field->type, nesting);
3326 if (ret)
3327 return ret;
3328 return lttng_field_name_statedump(session, field, nesting);
3329}
3330
3331static
3332int _lttng_string_type_statedump(struct lttng_session *session,
3333 const struct lttng_type *type,
3334 size_t nesting)
3335{
3336 int ret;
3337
3338 WARN_ON_ONCE(type->atype != atype_string);
3339 /* Default encoding is UTF8 */
3340 ret = print_tabs(session, nesting);
3341 if (ret)
3342 return ret;
3343 ret = lttng_metadata_printf(session,
3344 "string%s",
3345 type->u.string.encoding == lttng_encode_ASCII ?
3346 " { encoding = ASCII; }" : "");
3347 return ret;
3348}
3349
3350static
3351int _lttng_string_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3352 const struct lttng_event_field *field,
3353 size_t nesting)
ceabb767
MD		 3354{
3355 int ret;
3356
3357 WARN_ON_ONCE(field->type.atype != atype_string);
3358 ret = _lttng_string_type_statedump(session, &field->type, nesting);
3359 if (ret)
3360 return ret;
3361 return lttng_field_name_statedump(session, field, nesting);
3362}
3363
3364/*
3365 * Must be called with sessions_mutex held.
3366 */
3367static
3368int _lttng_type_statedump(struct lttng_session *session,
3369 const struct lttng_type *type,
3370 size_t nesting)
c099397a 3371{
c099397a 3372 int ret = 0;
c099397a 3373
ceabb767 3374 switch (type->atype) {
8070f5c0 3375 case atype_integer:
ceabb767 3376 ret = _lttng_integer_type_statedump(session, type, nesting);
8070f5c0 3377 break;
ceabb767
MD		 3378 case atype_enum_nestable:
3379 ret = _lttng_enum_type_statedump(session, type, nesting);
8070f5c0 3380 break;
ceabb767
MD		 3381 case atype_string:
3382 ret = _lttng_string_type_statedump(session, type, nesting);
3383 break;
3384 case atype_struct_nestable:
3385 ret = _lttng_struct_type_statedump(session, type, nesting);
8070f5c0 3386 break;
ceabb767
MD		 3387 case atype_variant_nestable:
3388 ret = _lttng_variant_type_statedump(session, type, nesting);
3389 break;
3390
3391 /* Nested arrays and sequences are not supported yet. */
3392 case atype_array_nestable:
3393 case atype_sequence_nestable:
3394 default:
3395 WARN_ON_ONCE(1);
3396 return -EINVAL;
8070f5c0 3397 }
ceabb767
MD		 3398 return ret;
3399}
8070f5c0 3400
ceabb767
MD		 3401/*
3402 * Must be called with sessions_mutex held.
3403 */
3404static
3405int _lttng_field_statedump(struct lttng_session *session,
3406 const struct lttng_event_field *field,
3407 size_t nesting)
3408{
3409 int ret = 0;
27d2368e 3410
ceabb767
MD		 3411 switch (field->type.atype) {
3412 case atype_integer:
3413 ret = _lttng_integer_field_statedump(session, field, nesting);
3414 break;
3415 case atype_enum_nestable:
3416 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3417 break;
8070f5c0 3418 case atype_string:
ceabb767 3419 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3420 break;
ceabb767
MD		 3421 case atype_struct_nestable:
3422 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3423 break;
ceabb767
MD		 3424 case atype_array_nestable:
3425 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3426 break;
ceabb767
MD		 3427 case atype_sequence_nestable:
3428 ret = _lttng_sequence_field_statedump(session, field, nesting);
f513b2bf 3429 break;
ceabb767
MD		 3430 case atype_variant_nestable:
3431 ret = _lttng_variant_field_statedump(session, field, nesting);
65c85aa6 3432 break;
f513b2bf 3433
8070f5c0
MD		 3434 default:
3435 WARN_ON_ONCE(1);
3436 return -EINVAL;
3437 }
3438 return ret;
3439}
3440
3441static
a90917c3 3442int _lttng_context_metadata_statedump(struct lttng_session *session,
8070f5c0
MD		 3443 struct lttng_ctx *ctx)
3444{
3445 int ret = 0;
3446 int i;
3447
3448 if (!ctx)
3449 return 0;
3450 for (i = 0; i < ctx->nr_fields; i++) {
3451 const struct lttng_ctx_field *field = &ctx->fields[i];
3452
f513b2bf 3453 ret = _lttng_field_statedump(session, &field->event_field, 2);
8070f5c0
MD		 3454 if (ret)
3455 return ret;
3456 }
3457 return ret;
3458}
3459
3460static
a90917c3
MD		 3461int _lttng_fields_metadata_statedump(struct lttng_session *session,
3462 struct lttng_event *event)
8070f5c0
MD		 3463{
3464 const struct lttng_event_desc *desc = event->desc;
3465 int ret = 0;
3466 int i;
3467
3468 for (i = 0; i < desc->nr_fields; i++) {
3469 const struct lttng_event_field *field = &desc->fields[i];
3470
f513b2bf 3471 ret = _lttng_field_statedump(session, field, 2);
8070f5c0
MD		 3472 if (ret)
3473 return ret;
c099397a
MD		 3474 }
3475 return ret;
3476}
3477
d83004aa
JD		 3478/*
3479 * Must be called with sessions_mutex held.
8b97fd42
MD		 3480 * The entire event metadata is printed as a single atomic metadata
3481 * transaction.
d83004aa 3482 */
c099397a 3483static
a90917c3
MD		 3484int _lttng_event_metadata_statedump(struct lttng_session *session,
3485 struct lttng_channel *chan,
3486 struct lttng_event *event)
c099397a
MD		 3487{
3488 int ret = 0;
3489
585e5dcc 3490 if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3491 return 0;
d83004aa 3492 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3493 return 0;
3494
8b97fd42
MD		 3495 lttng_metadata_begin(session);
3496
c099397a
MD		 3497 ret = lttng_metadata_printf(session,
3498 "event {\n"
ae734547 3499 " name = \"%s\";\n"
c099397a 3500 " id = %u;\n"
b9074a1b 3501 " stream_id = %u;\n",
c099397a
MD		 3502 event->desc->name,
3503 event->id,
3504 event->chan->id);
3505 if (ret)
3506 goto end;
3507
b9074a1b
MD		 3508 if (event->ctx) {
3509 ret = lttng_metadata_printf(session,
3510 " context := struct {\n");
3511 if (ret)
3512 goto end;
3513 }
a90917c3 3514 ret = _lttng_context_metadata_statedump(session, event->ctx);
8070f5c0
MD		 3515 if (ret)
3516 goto end;
b9074a1b
MD		 3517 if (event->ctx) {
3518 ret = lttng_metadata_printf(session,
3519 " };\n");
3520 if (ret)
3521 goto end;
3522 }
8070f5c0
MD		 3523
3524 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3525 " fields := struct {\n"
3526 );
3527 if (ret)
3528 goto end;
3529
a90917c3 3530 ret = _lttng_fields_metadata_statedump(session, event);
c099397a
MD		 3531 if (ret)
3532 goto end;
3533
3534 /*
3535 * LTTng space reservation can only reserve multiples of the
3536 * byte size.
3537 */
3538 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3539 " };\n"
3540 "};\n\n");
c099397a
MD		 3541 if (ret)
3542 goto end;
3543
c099397a
MD		 3544 event->metadata_dumped = 1;
3545end:
8b97fd42 3546 lttng_metadata_end(session);
c099397a
MD		 3547 return ret;
3548
3549}
3550
d83004aa
JD		 3551/*
3552 * Must be called with sessions_mutex held.
8b97fd42
MD		 3553 * The entire channel metadata is printed as a single atomic metadata
3554 * transaction.
d83004aa 3555 */
c099397a 3556static
a90917c3
MD		 3557int _lttng_channel_metadata_statedump(struct lttng_session *session,
3558 struct lttng_channel *chan)
c099397a
MD		 3559{
3560 int ret = 0;
3561
585e5dcc 3562 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3563 return 0;
d83004aa
JD		 3564
3565 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3566 return 0;
3567
8b97fd42
MD		 3568 lttng_metadata_begin(session);
3569
c099397a
MD		 3570 WARN_ON_ONCE(!chan->header_type);
3571 ret = lttng_metadata_printf(session,
3572 "stream {\n"
3573 " id = %u;\n"
9115fbdc 3574 " event.header := %s;\n"
b9074a1b 3575 " packet.context := struct packet_context;\n",
c099397a
MD		 3576 chan->id,
3577 chan->header_type == 1 ? "struct event_header_compact" :
3578 "struct event_header_large");
3579 if (ret)
3580 goto end;
3581
b9074a1b
MD		 3582 if (chan->ctx) {
3583 ret = lttng_metadata_printf(session,
3584 " event.context := struct {\n");
3585 if (ret)
3586 goto end;
3587 }
a90917c3 3588 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 3589 if (ret)
3590 goto end;
b9074a1b
MD		 3591 if (chan->ctx) {
3592 ret = lttng_metadata_printf(session,
3593 " };\n");
3594 if (ret)
3595 goto end;
3596 }
8070f5c0
MD		 3597
3598 ret = lttng_metadata_printf(session,
b9074a1b 3599 "};\n\n");
8070f5c0 3600
c099397a
MD		 3601 chan->metadata_dumped = 1;
3602end:
8b97fd42 3603 lttng_metadata_end(session);
c099397a
MD		 3604 return ret;
3605}
3606
d83004aa
JD		 3607/*
3608 * Must be called with sessions_mutex held.
3609 */
9115fbdc 3610static
a90917c3 3611int _lttng_stream_packet_context_declare(struct lttng_session *session)
9115fbdc
MD		 3612{
3613 return lttng_metadata_printf(session,
3614 "struct packet_context {\n"
a3ccff4f
MD		 3615 " uint64_clock_monotonic_t timestamp_begin;\n"
3616 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3617 " uint64_t content_size;\n"
3618 " uint64_t packet_size;\n"
5b3cf4f9 3619 " uint64_t packet_seq_num;\n"
a9afe705 3620 " unsigned long events_discarded;\n"
9115fbdc 3621 " uint32_t cpu_id;\n"
c6dfdf6f 3622 "};\n\n"
9115fbdc
MD		 3623 );
3624}
3625
3626/*
3627 * Compact header:
3628 * id: range: 0 - 30.
3629 * id 31 is reserved to indicate an extended header.
3630 *
3631 * Large header:
3632 * id: range: 0 - 65534.
3633 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3634 *
3635 * Must be called with sessions_mutex held.
9115fbdc
MD		 3636 */
3637static
a90917c3 3638int _lttng_event_header_declare(struct lttng_session *session)
9115fbdc
MD		 3639{
3640 return lttng_metadata_printf(session,
3641 "struct event_header_compact {\n"
3642 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3643 " variant <id> {\n"
3644 " struct {\n"
a3ccff4f 3645 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3646 " } compact;\n"
3647 " struct {\n"
3648 " uint32_t id;\n"
a3ccff4f 3649 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3650 " } extended;\n"
3651 " } v;\n"
3652 "} align(%u);\n"
3653 "\n"
3654 "struct event_header_large {\n"
3655 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3656 " variant <id> {\n"
3657 " struct {\n"
a3ccff4f 3658 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3659 " } compact;\n"
3660 " struct {\n"
3661 " uint32_t id;\n"
a3ccff4f 3662 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3663 " } extended;\n"
3664 " } v;\n"
3665 "} align(%u);\n\n",
a90917c3
MD		 3666 lttng_alignof(uint32_t) * CHAR_BIT,
3667 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3668 );
3669}
3670
a3ccff4f
MD		 3671 /*
3672 * Approximation of NTP time of day to clock monotonic correlation,
3673 * taken at start of trace.
3674 * Yes, this is only an approximation. Yes, we can (and will) do better
3675 * in future versions.
5283350b
MD		 3676 * This function may return a negative offset. It may happen if the
3677 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3678 *
3679 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3680 * y2038 compliant.
a3ccff4f
MD		 3681 */
3682static
8967b2a3 3683int64_t measure_clock_offset(void)
a3ccff4f 3684{
dcb93448 3685 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3686 uint64_t tcf = trace_clock_freq();
dcb93448 3687 int64_t offset;
a3ccff4f 3688 unsigned long flags;
3636085f
MJ		 3689#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3690 struct timespec64 rts = { 0, 0 };
3691#else
3692 struct timespec rts = { 0, 0 };
3693#endif
a3ccff4f
MD		 3694
3695 /* Disable interrupts to increase correlation precision. */
3696 local_irq_save(flags);
3697 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3698#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3699 ktime_get_real_ts64(&rts);
3700#else
216b6baa 3701 getnstimeofday(&rts);
3636085f 3702#endif
a3ccff4f
MD		 3703 monotonic[1] = trace_clock_read64();
3704 local_irq_restore(flags);
3705
dcb93448 3706 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3707 realtime = (uint64_t) rts.tv_sec * tcf;
3708 if (tcf == NSEC_PER_SEC) {
3709 realtime += rts.tv_nsec;
3710 } else {
3711 uint64_t n = rts.tv_nsec * tcf;
3712
3713 do_div(n, NSEC_PER_SEC);
3714 realtime += n;
3715 }
dcb93448 3716 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3717 return offset;
3718}
3719
3eb95be4
JR		 3720static
3721int print_escaped_ctf_string(struct lttng_session *session, const char *string)
3722{
0f3eaad4 3723 int ret = 0;
3eb95be4
JR		 3724 size_t i;
3725 char cur;
3726
3727 i = 0;
3728 cur = string[i];
3729 while (cur != '\0') {
3730 switch (cur) {
3731 case '\n':
3732 ret = lttng_metadata_printf(session, "%s", "\\n");
3733 break;
3734 case '\\':
3735 case '"':
3736 ret = lttng_metadata_printf(session, "%c", '\\');
3737 if (ret)
3738 goto error;
3739 /* We still print the current char */
3740 /* Fallthrough */
3741 default:
3742 ret = lttng_metadata_printf(session, "%c", cur);
3743 break;
3744 }
3745
3746 if (ret)
3747 goto error;
3748
3749 cur = string[++i];
3750 }
3751error:
3752 return ret;
3753}
3754
3755static
1c88f269
JR		 3756int print_metadata_escaped_field(struct lttng_session *session, const char *field,
3757 const char *field_value)
3eb95be4
JR		 3758{
3759 int ret;
3760
1c88f269 3761 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3762 if (ret)
3763 goto error;
3764
1c88f269 3765 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3766 if (ret)
3767 goto error;
3768
3769 ret = lttng_metadata_printf(session, "\";\n");
3770
3771error:
3772 return ret;
3773}
3774
c099397a
MD		 3775/*
3776 * Output metadata into this session's metadata buffers.
d83004aa 3777 * Must be called with sessions_mutex held.
c099397a
MD		 3778 */
3779static
a90917c3 3780int _lttng_session_metadata_statedump(struct lttng_session *session)
c099397a 3781{
30bdb6e4 3782 unsigned char *uuid_c = session->uuid.b;
a82c63f1 3783 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3784 const char *product_uuid;
a90917c3
MD		 3785 struct lttng_channel *chan;
3786 struct lttng_event *event;
c099397a
MD		 3787 int ret = 0;
3788
585e5dcc 3789 if (!LTTNG_READ_ONCE(session->active))
c099397a 3790 return 0;
8b97fd42
MD		 3791
3792 lttng_metadata_begin(session);
3793
c099397a
MD		 3794 if (session->metadata_dumped)
3795 goto skip_session;
c099397a 3796
d793d5e1 3797 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3798 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3799 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3800 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3801 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3802 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3803
3804 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3805 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3806 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3807 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3808 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3809 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3810 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3811 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3812 "\n"
3813 "trace {\n"
3814 " major = %u;\n"
3815 " minor = %u;\n"
30bdb6e4 3816 " uuid = \"%s\";\n"
d793d5e1
MD		 3817 " byte_order = %s;\n"
3818 " packet.header := struct {\n"
3819 " uint32_t magic;\n"
1ec3f75a 3820 " uint8_t uuid[16];\n"
d793d5e1 3821 " uint32_t stream_id;\n"
5594698f 3822 " uint64_t stream_instance_id;\n"
0eb25f58 3823 " };\n"
d793d5e1 3824 "};\n\n",
a90917c3
MD		 3825 lttng_alignof(uint8_t) * CHAR_BIT,
3826 lttng_alignof(uint16_t) * CHAR_BIT,
3827 lttng_alignof(uint32_t) * CHAR_BIT,
3828 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3829 sizeof(unsigned long) * CHAR_BIT,
3830 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3831 CTF_SPEC_MAJOR,
3832 CTF_SPEC_MINOR,
d793d5e1 3833 uuid_s,
5214fa50 3834#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3835 "be"
3836#else
3837 "le"
3838#endif
3839 );
3840 if (ret)
3841 goto end;
3842
99dc9597
MD		 3843 ret = lttng_metadata_printf(session,
3844 "env {\n"
a6058143 3845 " hostname = \"%s\";\n"
c6c9e10f 3846 " domain = \"kernel\";\n"
99dc9597 3847 " sysname = \"%s\";\n"
c6c9e10f
MD		 3848 " kernel_release = \"%s\";\n"
3849 " kernel_version = \"%s\";\n"
3850 " tracer_name = \"lttng-modules\";\n"
3851 " tracer_major = %d;\n"
3852 " tracer_minor = %d;\n"
3853 " tracer_patchlevel = %d;\n"
3eb95be4 3854 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3855 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3856 utsname()->sysname,
3857 utsname()->release,
c6c9e10f
MD		 3858 utsname()->version,
3859 LTTNG_MODULES_MAJOR_VERSION,
3860 LTTNG_MODULES_MINOR_VERSION,
3861 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3862 );
3863 if (ret)
3864 goto end;
3865
1c88f269
JR		 3866 ret = print_metadata_escaped_field(session, "trace_name", session->name);
3867 if (ret)
3868 goto end;
3869 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
3870 session->creation_time);
3eb95be4
JR		 3871 if (ret)
3872 goto end;
3873
c88f762e
GB		 3874 /* Add the product UUID to the 'env' section */
3875 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3876 if (product_uuid) {
3877 ret = lttng_metadata_printf(session,
3878 " product_uuid = \"%s\";\n",
3879 product_uuid
3880 );
3881 if (ret)
3882 goto end;
3883 }
3884
3885 /* Close the 'env' section */
3eb95be4
JR		 3886 ret = lttng_metadata_printf(session, "};\n\n");
3887 if (ret)
3888 goto end;
3889
a3ccff4f
MD		 3890 ret = lttng_metadata_printf(session,
3891 "clock {\n"
2754583e
MD		 3892 " name = \"%s\";\n",
3893 trace_clock_name()
a82c63f1
MD		 3894 );
3895 if (ret)
3896 goto end;
3897
3898 if (!trace_clock_uuid(clock_uuid_s)) {
3899 ret = lttng_metadata_printf(session,
7c27cb17 3900 " uuid = \"%s\";\n",
a82c63f1
MD		 3901 clock_uuid_s
3902 );
3903 if (ret)
3904 goto end;
3905 }
3906
3907 ret = lttng_metadata_printf(session,
2754583e 3908 " description = \"%s\";\n"
a3ccff4f
MD		 3909 " freq = %llu; /* Frequency, in Hz */\n"
3910 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 3911 " offset = %lld;\n"
a3ccff4f 3912 "};\n\n",
2754583e 3913 trace_clock_description(),
a3ccff4f 3914 (unsigned long long) trace_clock_freq(),
8967b2a3 3915 (long long) measure_clock_offset()
a3ccff4f
MD		 3916 );
3917 if (ret)
3918 goto end;
3919
3920 ret = lttng_metadata_printf(session,
3921 "typealias integer {\n"
3922 " size = 27; align = 1; signed = false;\n"
2754583e 3923 " map = clock.%s.value;\n"
a3ccff4f
MD		 3924 "} := uint27_clock_monotonic_t;\n"
3925 "\n"
3926 "typealias integer {\n"
3927 " size = 32; align = %u; signed = false;\n"
2754583e 3928 " map = clock.%s.value;\n"
a3ccff4f
MD		 3929 "} := uint32_clock_monotonic_t;\n"
3930 "\n"
3931 "typealias integer {\n"
3932 " size = 64; align = %u; signed = false;\n"
2754583e 3933 " map = clock.%s.value;\n"
a3ccff4f 3934 "} := uint64_clock_monotonic_t;\n\n",
2754583e 3935 trace_clock_name(),
a3ccff4f 3936 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 3937 trace_clock_name(),
3938 lttng_alignof(uint64_t) * CHAR_BIT,
3939 trace_clock_name()
a3ccff4f
MD		 3940 );
3941 if (ret)
3942 goto end;
3943
a90917c3 3944 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 3945 if (ret)
3946 goto end;
3947
a90917c3 3948 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 3949 if (ret)
3950 goto end;
3951
c099397a
MD		 3952skip_session:
3953 list_for_each_entry(chan, &session->chan, list) {
a90917c3 3954 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 3955 if (ret)
3956 goto end;
3957 }
3958
3959 list_for_each_entry(event, &session->events, list) {
a90917c3 3960 ret = _lttng_event_metadata_statedump(session, event->chan, event);
c099397a
MD		 3961 if (ret)
3962 goto end;
3963 }
3964 session->metadata_dumped = 1;
3965end:
8b97fd42 3966 lttng_metadata_end(session);
c099397a
MD		 3967 return ret;
3968}
3969
c0e31d2e 3970/**
a90917c3 3971 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 3972 * @transport: transport structure
3973 *
3974 * Registers a transport which can be used as output to extract the data out of
3975 * LTTng. The module calling this registration function must ensure that no
3976 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 3977 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 3978 * is made visible to the transport function. This registration acts as a
263b6c88 3979 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 3980 * after its registration must it synchronize the TLBs.
3981 */
a90917c3 3982void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 3983{
3984 /*
3985 * Make sure no page fault can be triggered by the module about to be
3986 * registered. We deal with this here so we don't have to call
263b6c88 3987 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 3988 */
263b6c88 3989 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 3990
3991 mutex_lock(&sessions_mutex);
a90917c3 3992 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 3993 mutex_unlock(&sessions_mutex);
3994}
a90917c3 3995EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 3996
3997/**
a90917c3 3998 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 3999 * @transport: transport structure
4000 */
a90917c3 4001void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 4002{
4003 mutex_lock(&sessions_mutex);
4004 list_del(&transport->node);
4005 mutex_unlock(&sessions_mutex);
4006}
a90917c3 4007EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 4008
a101fa10
MD		 4009void lttng_counter_transport_register(struct lttng_counter_transport *transport)
4010{
4011 /*
4012 * Make sure no page fault can be triggered by the module about to be
4013 * registered. We deal with this here so we don't have to call
4014 * vmalloc_sync_mappings() in each module's init.
4015 */
4016 wrapper_vmalloc_sync_mappings();
4017
4018 mutex_lock(&sessions_mutex);
4019 list_add_tail(&transport->node, &lttng_counter_transport_list);
4020 mutex_unlock(&sessions_mutex);
4021}
4022EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
4023
4024void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
4025{
4026 mutex_lock(&sessions_mutex);
4027 list_del(&transport->node);
4028 mutex_unlock(&sessions_mutex);
4029}
4030EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
4031
5f4c791e 4032#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 4033
4034enum cpuhp_state lttng_hp_prepare;
4035enum cpuhp_state lttng_hp_online;
4036
4037static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
4038{
4039 struct lttng_cpuhp_node *lttng_node;
4040
4041 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4042 switch (lttng_node->component) {
4043 case LTTNG_RING_BUFFER_FRONTEND:
4044 return 0;
4045 case LTTNG_RING_BUFFER_BACKEND:
4046 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
4047 case LTTNG_RING_BUFFER_ITER:
4048 return 0;
4049 case LTTNG_CONTEXT_PERF_COUNTERS:
4050 return 0;
4051 default:
4052 return -EINVAL;
4053 }
4054}
4055
4056static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
4057{
4058 struct lttng_cpuhp_node *lttng_node;
4059
4060 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4061 switch (lttng_node->component) {
4062 case LTTNG_RING_BUFFER_FRONTEND:
4063 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
4064 case LTTNG_RING_BUFFER_BACKEND:
4065 return 0;
4066 case LTTNG_RING_BUFFER_ITER:
4067 return 0;
4068 case LTTNG_CONTEXT_PERF_COUNTERS:
4069 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
4070 default:
4071 return -EINVAL;
4072 }
4073}
4074
4075static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
4076{
4077 struct lttng_cpuhp_node *lttng_node;
4078
4079 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4080 switch (lttng_node->component) {
4081 case LTTNG_RING_BUFFER_FRONTEND:
4082 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
4083 case LTTNG_RING_BUFFER_BACKEND:
4084 return 0;
4085 case LTTNG_RING_BUFFER_ITER:
4086 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
4087 case LTTNG_CONTEXT_PERF_COUNTERS:
4088 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
4089 default:
4090 return -EINVAL;
4091 }
4092}
4093
4094static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
4095{
4096 struct lttng_cpuhp_node *lttng_node;
4097
4098 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
4099 switch (lttng_node->component) {
4100 case LTTNG_RING_BUFFER_FRONTEND:
4101 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
4102 case LTTNG_RING_BUFFER_BACKEND:
4103 return 0;
4104 case LTTNG_RING_BUFFER_ITER:
4105 return 0;
4106 case LTTNG_CONTEXT_PERF_COUNTERS:
4107 return 0;
4108 default:
4109 return -EINVAL;
4110 }
4111}
4112
4113static int __init lttng_init_cpu_hotplug(void)
4114{
4115 int ret;
4116
4117 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4118 lttng_hotplug_prepare,
4119 lttng_hotplug_dead);
4120 if (ret < 0) {
4121 return ret;
4122 }
4123 lttng_hp_prepare = ret;
4124 lttng_rb_set_hp_prepare(ret);
4125
4126 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4127 lttng_hotplug_online,
4128 lttng_hotplug_offline);
4129 if (ret < 0) {
4130 cpuhp_remove_multi_state(lttng_hp_prepare);
4131 lttng_hp_prepare = 0;
4132 return ret;
4133 }
4134 lttng_hp_online = ret;
4135 lttng_rb_set_hp_online(ret);
4136
4137 return 0;
4138}
4139
4140static void __exit lttng_exit_cpu_hotplug(void)
4141{
4142 lttng_rb_set_hp_online(0);
4143 cpuhp_remove_multi_state(lttng_hp_online);
4144 lttng_rb_set_hp_prepare(0);
4145 cpuhp_remove_multi_state(lttng_hp_prepare);
4146}
4147
5f4c791e 4148#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4149static int lttng_init_cpu_hotplug(void)
4150{
4151 return 0;
4152}
4153static void lttng_exit_cpu_hotplug(void)
4154{
4155}
5f4c791e 4156#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 4157
4158
a90917c3 4159static int __init lttng_events_init(void)
4e3c1b9b 4160{
1c25284c
MD		 4161 int ret;
4162
453b2495
JD		 4163 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4164 if (ret)
4165 return ret;
389d7070 4166 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 4167 if (ret)
4168 return ret;
4169 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 4170 if (ret)
4171 return ret;
4172 ret = lttng_probes_init();
389d7070
MD		 4173 if (ret)
4174 return ret;
07dfc1d0 4175 ret = lttng_context_init();
20591cf7
MD		 4176 if (ret)
4177 return ret;
07dfc1d0
MD		 4178 ret = lttng_tracepoint_init();
4179 if (ret)
4180 goto error_tp;
a90917c3 4181 event_cache = KMEM_CACHE(lttng_event, 0);
20591cf7
MD		 4182 if (!event_cache) {
4183 ret = -ENOMEM;
dffef45d
FD		 4184 goto error_kmem_event;
4185 }
4186 event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0);
4187 if (!event_notifier_cache) {
4188 ret = -ENOMEM;
4189 goto error_kmem_event_notifier;
20591cf7 4190 }
80996790 4191 ret = lttng_abi_init();
02119ee5
MD		 4192 if (ret)
4193 goto error_abi;
0c956676
MD		 4194 ret = lttng_logger_init();
4195 if (ret)
4196 goto error_logger;
1e367326
MD		 4197 ret = lttng_init_cpu_hotplug();
4198 if (ret)
4199 goto error_hotplug;
101215b7 4200 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4201 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4202 __stringify(LTTNG_MODULES_MINOR_VERSION),
4203 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4204 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4205 LTTNG_VERSION_NAME,
4206#ifdef LTTNG_EXTRA_VERSION_GIT
4207 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4208#else
4209 "",
4210#endif
4211#ifdef LTTNG_EXTRA_VERSION_NAME
4212 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4213#else
4214 "");
4215#endif
4e3c1b9b 4216 return 0;
0c956676 4217
1e367326
MD		 4218error_hotplug:
4219 lttng_logger_exit();
0c956676
MD		 4220error_logger:
4221 lttng_abi_exit();
02119ee5 4222error_abi:
dffef45d
FD		 4223 kmem_cache_destroy(event_notifier_cache);
4224error_kmem_event_notifier:
1c25284c 4225 kmem_cache_destroy(event_cache);
dffef45d 4226error_kmem_event:
20591cf7 4227 lttng_tracepoint_exit();
07dfc1d0
MD		 4228error_tp:
4229 lttng_context_exit();
101215b7 4230 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4231 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4232 __stringify(LTTNG_MODULES_MINOR_VERSION),
4233 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4234 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4235 LTTNG_VERSION_NAME,
4236#ifdef LTTNG_EXTRA_VERSION_GIT
4237 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4238#else
4239 "",
4240#endif
4241#ifdef LTTNG_EXTRA_VERSION_NAME
4242 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4243#else
4244 "");
4245#endif
1c25284c 4246 return ret;
4e3c1b9b
MD		 4247}
4248
a90917c3 4249module_init(lttng_events_init);
11b5a3c2 4250
a90917c3 4251static void __exit lttng_events_exit(void)
4e3c1b9b 4252{
a90917c3 4253 struct lttng_session *session, *tmpsession;
92e94819 4254
1e367326 4255 lttng_exit_cpu_hotplug();
0c956676 4256 lttng_logger_exit();
80996790 4257 lttng_abi_exit();
92e94819 4258 list_for_each_entry_safe(session, tmpsession, &sessions, list)
a90917c3 4259 lttng_session_destroy(session);
11b5a3c2 4260 kmem_cache_destroy(event_cache);
dffef45d 4261 kmem_cache_destroy(event_notifier_cache);
20591cf7 4262 lttng_tracepoint_exit();
07dfc1d0 4263 lttng_context_exit();
101215b7 4264 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4265 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4266 __stringify(LTTNG_MODULES_MINOR_VERSION),
4267 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4268 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4269 LTTNG_VERSION_NAME,
4270#ifdef LTTNG_EXTRA_VERSION_GIT
4271 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4272#else
4273 "",
4274#endif
4275#ifdef LTTNG_EXTRA_VERSION_NAME
4276 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4277#else
4278 "");
4279#endif
4e3c1b9b 4280}
92e94819 4281
a90917c3 4282module_exit(lttng_events_exit);
11b5a3c2 4283
7ca11e77 4284#include <generated/patches.h>
101215b7
MJ		 4285#ifdef LTTNG_EXTRA_VERSION_GIT
4286MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4287#endif
4288#ifdef LTTNG_EXTRA_VERSION_NAME
4289MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4290#endif
92e94819
MD		 4291MODULE_LICENSE("GPL and additional rights");
4292MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4293MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4294MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4295 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4296 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4297 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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