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