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Implement event notifiers for syscalls
[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
8ced8896
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
dffef45d
FD		 346 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
347 &event_notifier_group->enablers_head, node)
348 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
349
350 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
351 &event_notifier_group->event_notifiers_head, list)
352 _lttng_event_notifier_destroy(event_notifier);
353
750b05f2
FD		 354 event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
355 module_put(event_notifier_group->transport->owner);
356 list_del(&event_notifier_group->node);
dffef45d 357
750b05f2
FD		 358 mutex_unlock(&sessions_mutex);
359 lttng_kvfree(event_notifier_group);
360}
361
601252cf
MD		 362int lttng_session_statedump(struct lttng_session *session)
363{
364 int ret;
365
366 mutex_lock(&sessions_mutex);
367 ret = lttng_statedump_start(session);
368 mutex_unlock(&sessions_mutex);
369 return ret;
370}
371
a90917c3 372int lttng_session_enable(struct lttng_session *session)
c0e31d2e
MD		 373{
374 int ret = 0;
a90917c3 375 struct lttng_channel *chan;
c0e31d2e
MD		 376
377 mutex_lock(&sessions_mutex);
378 if (session->active) {
379 ret = -EBUSY;
380 goto end;
381 }
c099397a 382
3c997079
MD		 383 /* Set transient enabler state to "enabled" */
384 session->tstate = 1;
385
4ef81e4a 386 /* We need to sync enablers with session before activation. */
b2bc0bc8 387 lttng_session_sync_event_enablers(session);
4ef81e4a 388
c099397a
MD		 389 /*
390 * Snapshot the number of events per channel to know the type of header
391 * we need to use.
392 */
393 list_for_each_entry(chan, &session->chan, list) {
394 if (chan->header_type)
395 continue; /* don't change it if session stop/restart */
396 if (chan->free_event_id < 31)
397 chan->header_type = 1; /* compact */
398 else
399 chan->header_type = 2; /* large */
400 }
401
64af2437 402 /* Clear each stream's quiescent state. */
09b93db9
MD		 403 list_for_each_entry(chan, &session->chan, list) {
404 if (chan->channel_type != METADATA_CHANNEL)
405 lib_ring_buffer_clear_quiescent_channel(chan->chan);
406 }
64af2437 407
a8f2d0c7
MJ		 408 WRITE_ONCE(session->active, 1);
409 WRITE_ONCE(session->been_active, 1);
a90917c3 410 ret = _lttng_session_metadata_statedump(session);
c337ddc2 411 if (ret) {
a8f2d0c7 412 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 413 goto end;
414 }
415 ret = lttng_statedump_start(session);
360f38ea 416 if (ret)
a8f2d0c7 417 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 418end:
419 mutex_unlock(&sessions_mutex);
11b5a3c2 420 return ret;
c0e31d2e
MD		 421}
422
a90917c3 423int lttng_session_disable(struct lttng_session *session)
c0e31d2e
MD		 424{
425 int ret = 0;
64af2437 426 struct lttng_channel *chan;
c0e31d2e
MD		 427
428 mutex_lock(&sessions_mutex);
429 if (!session->active) {
430 ret = -EBUSY;
431 goto end;
432 }
a8f2d0c7 433 WRITE_ONCE(session->active, 0);
3c997079
MD		 434
435 /* Set transient enabler state to "disabled" */
436 session->tstate = 0;
b2bc0bc8 437 lttng_session_sync_event_enablers(session);
64af2437
MD		 438
439 /* Set each stream's quiescent state. */
09b93db9
MD		 440 list_for_each_entry(chan, &session->chan, list) {
441 if (chan->channel_type != METADATA_CHANNEL)
442 lib_ring_buffer_set_quiescent_channel(chan->chan);
443 }
c0e31d2e
MD		 444end:
445 mutex_unlock(&sessions_mutex);
11b5a3c2 446 return ret;
c0e31d2e
MD		 447}
448
9616f0bf
JD		 449int lttng_session_metadata_regenerate(struct lttng_session *session)
450{
451 int ret = 0;
452 struct lttng_channel *chan;
453 struct lttng_event *event;
454 struct lttng_metadata_cache *cache = session->metadata_cache;
455 struct lttng_metadata_stream *stream;
456
457 mutex_lock(&sessions_mutex);
458 if (!session->active) {
459 ret = -EBUSY;
460 goto end;
461 }
462
463 mutex_lock(&cache->lock);
464 memset(cache->data, 0, cache->cache_alloc);
465 cache->metadata_written = 0;
466 cache->version++;
467 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
468 stream->metadata_out = 0;
469 stream->metadata_in = 0;
470 }
471 mutex_unlock(&cache->lock);
472
473 session->metadata_dumped = 0;
474 list_for_each_entry(chan, &session->chan, list) {
475 chan->metadata_dumped = 0;
476 }
477
478 list_for_each_entry(event, &session->events, list) {
479 event->metadata_dumped = 0;
480 }
481
482 ret = _lttng_session_metadata_statedump(session);
483
484end:
485 mutex_unlock(&sessions_mutex);
486 return ret;
487}
488
a90917c3 489int lttng_channel_enable(struct lttng_channel *channel)
e64957da 490{
3c997079 491 int ret = 0;
e64957da 492
3c997079
MD		 493 mutex_lock(&sessions_mutex);
494 if (channel->channel_type == METADATA_CHANNEL) {
495 ret = -EPERM;
496 goto end;
497 }
498 if (channel->enabled) {
499 ret = -EEXIST;
500 goto end;
501 }
502 /* Set transient enabler state to "enabled" */
503 channel->tstate = 1;
b2bc0bc8 504 lttng_session_sync_event_enablers(channel->session);
3c997079 505 /* Set atomically the state to "enabled" */
a8f2d0c7 506 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 507end:
508 mutex_unlock(&sessions_mutex);
509 return ret;
e64957da
MD		 510}
511
a90917c3 512int lttng_channel_disable(struct lttng_channel *channel)
e64957da 513{
3c997079 514 int ret = 0;
e64957da 515
3c997079
MD		 516 mutex_lock(&sessions_mutex);
517 if (channel->channel_type == METADATA_CHANNEL) {
518 ret = -EPERM;
519 goto end;
520 }
521 if (!channel->enabled) {
522 ret = -EEXIST;
523 goto end;
524 }
525 /* Set atomically the state to "disabled" */
a8f2d0c7 526 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 527 /* Set transient enabler state to "enabled" */
528 channel->tstate = 0;
b2bc0bc8 529 lttng_session_sync_event_enablers(channel->session);
3c997079
MD		 530end:
531 mutex_unlock(&sessions_mutex);
532 return ret;
e64957da
MD		 533}
534
a90917c3 535int lttng_event_enable(struct lttng_event *event)
e64957da 536{
3c997079 537 int ret = 0;
e64957da 538
3c997079
MD		 539 mutex_lock(&sessions_mutex);
540 if (event->chan->channel_type == METADATA_CHANNEL) {
541 ret = -EPERM;
542 goto end;
543 }
544 if (event->enabled) {
545 ret = -EEXIST;
546 goto end;
547 }
a0493bef
MD		 548 switch (event->instrumentation) {
549 case LTTNG_KERNEL_TRACEPOINT:
550 case LTTNG_KERNEL_SYSCALL:
551 ret = -EINVAL;
552 break;
553 case LTTNG_KERNEL_KPROBE:
149b9a9d 554 case LTTNG_KERNEL_UPROBE:
a0493bef 555 case LTTNG_KERNEL_NOOP:
a8f2d0c7 556 WRITE_ONCE(event->enabled, 1);
a0493bef
MD		 557 break;
558 case LTTNG_KERNEL_KRETPROBE:
559 ret = lttng_kretprobes_event_enable_state(event, 1);
560 break;
e884017c 561 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
a0493bef
MD		 562 default:
563 WARN_ON_ONCE(1);
564 ret = -EINVAL;
565 }
3c997079
MD		 566end:
567 mutex_unlock(&sessions_mutex);
568 return ret;
e64957da
MD		 569}
570
a90917c3 571int lttng_event_disable(struct lttng_event *event)
e64957da 572{
3c997079 573 int ret = 0;
e64957da 574
3c997079
MD		 575 mutex_lock(&sessions_mutex);
576 if (event->chan->channel_type == METADATA_CHANNEL) {
577 ret = -EPERM;
578 goto end;
579 }
580 if (!event->enabled) {
581 ret = -EEXIST;
582 goto end;
583 }
a0493bef
MD		 584 switch (event->instrumentation) {
585 case LTTNG_KERNEL_TRACEPOINT:
586 case LTTNG_KERNEL_SYSCALL:
587 ret = -EINVAL;
588 break;
589 case LTTNG_KERNEL_KPROBE:
149b9a9d 590 case LTTNG_KERNEL_UPROBE:
a0493bef 591 case LTTNG_KERNEL_NOOP:
a8f2d0c7 592 WRITE_ONCE(event->enabled, 0);
a0493bef
MD		 593 break;
594 case LTTNG_KERNEL_KRETPROBE:
595 ret = lttng_kretprobes_event_enable_state(event, 0);
596 break;
e884017c 597 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
a0493bef
MD		 598 default:
599 WARN_ON_ONCE(1);
600 ret = -EINVAL;
601 }
3c997079
MD		 602end:
603 mutex_unlock(&sessions_mutex);
604 return ret;
e64957da
MD		 605}
606
dffef45d
FD		 607int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier)
608{
609 int ret = 0;
610
611 mutex_lock(&sessions_mutex);
612 if (event_notifier->enabled) {
613 ret = -EEXIST;
614 goto end;
615 }
616 switch (event_notifier->instrumentation) {
617 case LTTNG_KERNEL_TRACEPOINT:
8ced8896 618 case LTTNG_KERNEL_SYSCALL:
b01155ba
FD		 619 ret = -EINVAL;
620 break;
dffef45d 621 case LTTNG_KERNEL_KPROBE:
9de67196 622 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 623 WRITE_ONCE(event_notifier->enabled, 1);
624 break;
dffef45d 625 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 626 case LTTNG_KERNEL_NOOP:
627 case LTTNG_KERNEL_KRETPROBE:
628 default:
629 WARN_ON_ONCE(1);
630 ret = -EINVAL;
631 }
632end:
633 mutex_unlock(&sessions_mutex);
634 return ret;
635}
636
637int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier)
638{
639 int ret = 0;
640
641 mutex_lock(&sessions_mutex);
642 if (!event_notifier->enabled) {
643 ret = -EEXIST;
644 goto end;
645 }
646 switch (event_notifier->instrumentation) {
647 case LTTNG_KERNEL_TRACEPOINT:
8ced8896 648 case LTTNG_KERNEL_SYSCALL:
b01155ba
FD		 649 ret = -EINVAL;
650 break;
dffef45d 651 case LTTNG_KERNEL_KPROBE:
9de67196 652 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 653 WRITE_ONCE(event_notifier->enabled, 0);
654 break;
dffef45d 655 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 656 case LTTNG_KERNEL_NOOP:
657 case LTTNG_KERNEL_KRETPROBE:
658 default:
659 WARN_ON_ONCE(1);
660 ret = -EINVAL;
661 }
662end:
663 mutex_unlock(&sessions_mutex);
664 return ret;
665}
666
a90917c3 667struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 668 const char *transport_name,
669 void *buf_addr,
4e3c1b9b
MD		 670 size_t subbuf_size, size_t num_subbuf,
671 unsigned int switch_timer_interval,
d83004aa
JD		 672 unsigned int read_timer_interval,
673 enum channel_type channel_type)
4e3c1b9b 674{
a90917c3
MD		 675 struct lttng_channel *chan;
676 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 677
678 mutex_lock(&sessions_mutex);
d83004aa 679 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 680 goto active; /* Refuse to add channel to active session */
a90917c3 681 transport = lttng_transport_find(transport_name);
f3d01b96 682 if (!transport) {
5a15f70c 683 printk(KERN_WARNING "LTTng: transport %s not found\n",
f3d01b96 684 transport_name);
c0e31d2e 685 goto notransport;
f3d01b96 686 }
a33c9927 687 if (!try_module_get(transport->owner)) {
5a15f70c 688 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
a33c9927
MD		 689 goto notransport;
690 }
a90917c3 691 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 692 if (!chan)
c0e31d2e 693 goto nomem;
4e3c1b9b 694 chan->session = session;
05d32c64 695 chan->id = session->free_chan_id++;
3b731ab1 696 chan->ops = &transport->ops;
125b4df4
MD		 697 /*
698 * Note: the channel creation op already writes into the packet
699 * headers. Therefore the "chan" information used as input
700 * should be already accessible.
701 */
5f5ddf01
MD		 702 chan->chan = transport->ops.channel_create(transport_name,
703 chan, buf_addr, subbuf_size, num_subbuf,
704 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 705 if (!chan->chan)
706 goto create_error;
3c997079 707 chan->tstate = 1;
e64957da 708 chan->enabled = 1;
a33c9927 709 chan->transport = transport;
d83004aa 710 chan->channel_type = channel_type;
4e3c1b9b
MD		 711 list_add(&chan->list, &session->chan);
712 mutex_unlock(&sessions_mutex);
713 return chan;
714
f3d01b96
MD		 715create_error:
716 kfree(chan);
c0e31d2e 717nomem:
a33c9927
MD		 718 if (transport)
719 module_put(transport->owner);
c0e31d2e 720notransport:
e5382b6d 721active:
4e3c1b9b
MD		 722 mutex_unlock(&sessions_mutex);
723 return NULL;
724}
725
726/*
d83004aa
JD		 727 * Only used internally at session destruction for per-cpu channels, and
728 * when metadata channel is released.
729 * Needs to be called with sessions mutex held.
4e3c1b9b 730 */
aa7c23a9 731static
a90917c3 732void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 733{
11b5a3c2 734 chan->ops->channel_destroy(chan->chan);
a33c9927 735 module_put(chan->transport->owner);
4e3c1b9b 736 list_del(&chan->list);
8070f5c0 737 lttng_destroy_context(chan->ctx);
4e3c1b9b
MD		 738 kfree(chan);
739}
740
d83004aa
JD		 741void lttng_metadata_channel_destroy(struct lttng_channel *chan)
742{
743 BUG_ON(chan->channel_type != METADATA_CHANNEL);
744
745 /* Protect the metadata cache with the sessions_mutex. */
746 mutex_lock(&sessions_mutex);
747 _lttng_channel_destroy(chan);
748 mutex_unlock(&sessions_mutex);
749}
750EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
751
752static
753void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
754{
755 stream->finalized = 1;
756 wake_up_interruptible(&stream->read_wait);
757}
758
e5382b6d
MD		 759/*
760 * Supports event creation while tracing session is active.
3c997079 761 * Needs to be called with sessions mutex held.
e5382b6d 762 */
3c997079
MD		 763struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
764 struct lttng_kernel_event *event_param,
765 void *filter,
766 const struct lttng_event_desc *event_desc,
767 enum lttng_kernel_instrumentation itype)
4e3c1b9b 768{
3c997079 769 struct lttng_session *session = chan->session;
a90917c3 770 struct lttng_event *event;
3c997079
MD		 771 const char *event_name;
772 struct hlist_head *head;
3d084699 773 int ret;
4e3c1b9b 774
abc0446a 775 if (chan->free_event_id == -1U) {
4cf0bf51 776 ret = -EMFILE;
e5382b6d 777 goto full;
abc0446a 778 }
3c997079
MD		 779
780 switch (itype) {
781 case LTTNG_KERNEL_TRACEPOINT:
782 event_name = event_desc->name;
783 break;
784 case LTTNG_KERNEL_KPROBE:
149b9a9d 785 case LTTNG_KERNEL_UPROBE:
3c997079 786 case LTTNG_KERNEL_KRETPROBE:
3c997079 787 case LTTNG_KERNEL_NOOP:
33a39a3c 788 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 789 event_name = event_param->name;
790 break;
e884017c 791 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
3c997079
MD		 792 default:
793 WARN_ON_ONCE(1);
794 ret = -EINVAL;
795 goto type_error;
796 }
4a11ef1c
FD		 797
798 head = utils_borrow_hash_table_bucket(session->events_ht.table,
799 LTTNG_EVENT_HT_SIZE, event_name);
d216ecae 800 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079
MD		 801 WARN_ON_ONCE(!event->desc);
802 if (!strncmp(event->desc->name, event_name,
803 LTTNG_KERNEL_SYM_NAME_LEN - 1)
804 && chan == event->chan) {
805 ret = -EEXIST;
806 goto exist;
abc0446a
MD		 807 }
808 }
3c997079 809
11b5a3c2 810 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 811 if (!event) {
4cf0bf51 812 ret = -ENOMEM;
4e3c1b9b 813 goto cache_error;
abc0446a 814 }
4e3c1b9b
MD		 815 event->chan = chan;
816 event->filter = filter;
e5382b6d 817 event->id = chan->free_event_id++;
3c997079
MD		 818 event->instrumentation = itype;
819 event->evtype = LTTNG_TYPE_EVENT;
07dfc1d0 820 INIT_LIST_HEAD(&event->bytecode_runtime_head);
3c997079
MD		 821 INIT_LIST_HEAD(&event->enablers_ref_head);
822
823 switch (itype) {
ab2277d6 824 case LTTNG_KERNEL_TRACEPOINT:
3c997079
MD		 825 /* Event will be enabled by enabler sync. */
826 event->enabled = 0;
827 event->registered = 0;
0bcedee9 828 event->desc = lttng_event_desc_get(event_name);
abc0446a 829 if (!event->desc) {
4cf0bf51 830 ret = -ENOENT;
d3dbe23c 831 goto register_error;
abc0446a 832 }
3c997079
MD		 833 /* Populate lttng_event structure before event registration. */
834 smp_wmb();
baf20995 835 break;
ab2277d6 836 case LTTNG_KERNEL_KPROBE:
a0493bef
MD		 837 /*
838 * Needs to be explicitly enabled after creation, since
839 * we may want to apply filters.
840 */
841 event->enabled = 0;
3c997079
MD		 842 event->registered = 1;
843 /*
844 * Populate lttng_event structure before event
845 * registration.
846 */
847 smp_wmb();
8bf17deb 848 ret = lttng_kprobes_register_event(event_name,
f17701fb
MD		 849 event_param->u.kprobe.symbol_name,
850 event_param->u.kprobe.offset,
851 event_param->u.kprobe.addr,
852 event);
abc0446a 853 if (ret) {
4cf0bf51 854 ret = -EINVAL;
d6d808f3 855 goto register_error;
abc0446a 856 }
edeb3137
MD		 857 ret = try_module_get(event->desc->owner);
858 WARN_ON_ONCE(!ret);
d6d808f3 859 break;
7371f44c
MD		 860 case LTTNG_KERNEL_KRETPROBE:
861 {
a90917c3 862 struct lttng_event *event_return;
7371f44c
MD		 863
864 /* kretprobe defines 2 events */
a0493bef
MD		 865 /*
866 * Needs to be explicitly enabled after creation, since
867 * we may want to apply filters.
868 */
869 event->enabled = 0;
3c997079 870 event->registered = 1;
7371f44c
MD		 871 event_return =
872 kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 873 if (!event_return) {
4cf0bf51 874 ret = -ENOMEM;
7371f44c 875 goto register_error;
abc0446a 876 }
7371f44c
MD		 877 event_return->chan = chan;
878 event_return->filter = filter;
879 event_return->id = chan->free_event_id++;
a0493bef 880 event_return->enabled = 0;
3c997079
MD		 881 event_return->registered = 1;
882 event_return->instrumentation = itype;
7371f44c 883 /*
a90917c3 884 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 885 */
886 smp_wmb();
3c997079 887 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 888 event_param->u.kretprobe.symbol_name,
889 event_param->u.kretprobe.offset,
890 event_param->u.kretprobe.addr,
891 event, event_return);
892 if (ret) {
893 kmem_cache_free(event_cache, event_return);
4cf0bf51 894 ret = -EINVAL;
7371f44c
MD		 895 goto register_error;
896 }
897 /* Take 2 refs on the module: one per event. */
898 ret = try_module_get(event->desc->owner);
899 WARN_ON_ONCE(!ret);
900 ret = try_module_get(event->desc->owner);
901 WARN_ON_ONCE(!ret);
a90917c3 902 ret = _lttng_event_metadata_statedump(chan->session, chan,
7371f44c 903 event_return);
abc0446a 904 WARN_ON_ONCE(ret > 0);
7371f44c
MD		 905 if (ret) {
906 kmem_cache_free(event_cache, event_return);
907 module_put(event->desc->owner);
908 module_put(event->desc->owner);
909 goto statedump_error;
910 }
911 list_add(&event_return->list, &chan->session->events);
912 break;
913 }
1ec65de1 914 case LTTNG_KERNEL_NOOP:
33a39a3c 915 case LTTNG_KERNEL_SYSCALL:
a0493bef
MD		 916 /*
917 * Needs to be explicitly enabled after creation, since
918 * we may want to apply filters.
919 */
920 event->enabled = 0;
3c997079
MD		 921 event->registered = 0;
922 event->desc = event_desc;
badfe9f5
MD		 923 switch (event_param->u.syscall.entryexit) {
924 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
925 ret = -EINVAL;
926 goto register_error;
927 case LTTNG_KERNEL_SYSCALL_ENTRY:
928 event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
929 break;
930 case LTTNG_KERNEL_SYSCALL_EXIT:
931 event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
932 break;
933 }
934 switch (event_param->u.syscall.abi) {
935 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
936 ret = -EINVAL;
937 goto register_error;
938 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
939 event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
940 break;
941 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
942 event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
943 break;
944 }
abc0446a 945 if (!event->desc) {
4cf0bf51 946 ret = -EINVAL;
259b6cb3 947 goto register_error;
abc0446a 948 }
1ec65de1 949 break;
149b9a9d 950 case LTTNG_KERNEL_UPROBE:
a344f64b
FD		 951 /*
952 * Needs to be explicitly enabled after creation, since
953 * we may want to apply filters.
954 */
955 event->enabled = 0;
956 event->registered = 1;
3aed4dca 957
a344f64b
FD		 958 /*
959 * Populate lttng_event structure before event
960 * registration.
961 */
962 smp_wmb();
149b9a9d 963
83b802dc 964 ret = lttng_uprobes_register_event(event_param->name,
56377c91 965 event_param->u.uprobe.fd,
149b9a9d
YB		 966 event);
967 if (ret)
968 goto register_error;
969 ret = try_module_get(event->desc->owner);
970 WARN_ON_ONCE(!ret);
971 break;
e884017c 972 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
baf20995
MD		 973 default:
974 WARN_ON_ONCE(1);
4cf0bf51 975 ret = -EINVAL;
df07930b 976 goto register_error;
baf20995 977 }
a90917c3 978 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
abc0446a
MD		 979 WARN_ON_ONCE(ret > 0);
980 if (ret) {
c099397a 981 goto statedump_error;
abc0446a 982 }
3c997079 983 hlist_add_head(&event->hlist, head);
dda6a249 984 list_add(&event->list, &chan->session->events);
4e3c1b9b
MD		 985 return event;
986
c099397a 987statedump_error:
259b6cb3 988 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 989register_error:
11b5a3c2 990 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 991cache_error:
992exist:
3c997079 993type_error:
e5382b6d 994full:
4cf0bf51 995 return ERR_PTR(ret);
4e3c1b9b
MD		 996}
997
dffef45d
FD		 998struct lttng_event_notifier *_lttng_event_notifier_create(
999 const struct lttng_event_desc *event_desc,
1000 uint64_t token, struct lttng_event_notifier_group *event_notifier_group,
1001 struct lttng_kernel_event_notifier *event_notifier_param,
1002 void *filter, enum lttng_kernel_instrumentation itype)
1003{
1004 struct lttng_event_notifier *event_notifier;
1005 const char *event_name;
1006 struct hlist_head *head;
1007 int ret;
1008
1009 switch (itype) {
1010 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1011 event_name = event_desc->name;
1012 break;
dffef45d 1013 case LTTNG_KERNEL_KPROBE:
9de67196 1014 case LTTNG_KERNEL_UPROBE:
8ced8896 1015 case LTTNG_KERNEL_SYSCALL:
2b16f0c9
FD		 1016 event_name = event_notifier_param->event.name;
1017 break;
dffef45d
FD		 1018 case LTTNG_KERNEL_KRETPROBE:
1019 case LTTNG_KERNEL_FUNCTION:
1020 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1021 default:
1022 WARN_ON_ONCE(1);
1023 ret = -EINVAL;
1024 goto type_error;
1025 }
1026
1027 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1028 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
1029 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1030 WARN_ON_ONCE(!event_notifier->desc);
1031 if (!strncmp(event_notifier->desc->name, event_name,
1032 LTTNG_KERNEL_SYM_NAME_LEN - 1)
1033 && event_notifier_group == event_notifier->group
1034 && token == event_notifier->user_token) {
1035 ret = -EEXIST;
1036 goto exist;
1037 }
1038 }
1039
1040 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1041 if (!event_notifier) {
1042 ret = -ENOMEM;
1043 goto cache_error;
1044 }
21f58fb7 1045
dffef45d
FD		 1046 event_notifier->group = event_notifier_group;
1047 event_notifier->user_token = token;
1048 event_notifier->filter = filter;
1049 event_notifier->instrumentation = itype;
1050 event_notifier->evtype = LTTNG_TYPE_EVENT;
21f58fb7 1051 event_notifier->send_notification = lttng_event_notifier_notification_send;
dffef45d
FD		 1052 INIT_LIST_HEAD(&event_notifier->bytecode_runtime_head);
1053 INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
1054
1055 switch (itype) {
1056 case LTTNG_KERNEL_TRACEPOINT:
1057 /* Event will be enabled by enabler sync. */
1058 event_notifier->enabled = 0;
1059 event_notifier->registered = 0;
1060 event_notifier->desc = lttng_event_desc_get(event_name);
1061 if (!event_notifier->desc) {
1062 ret = -ENOENT;
1063 goto register_error;
1064 }
1065 /* Populate lttng_event_notifier structure before event registration. */
1066 smp_wmb();
1067 break;
1068 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1069 /*
1070 * Needs to be explicitly enabled after creation, since
1071 * we may want to apply filters.
1072 */
1073 event_notifier->enabled = 0;
1074 event_notifier->registered = 1;
1075 /*
1076 * Populate lttng_event_notifier structure before event
1077 * registration.
1078 */
1079 smp_wmb();
1080 ret = lttng_kprobes_register_event_notifier(
1081 event_notifier_param->event.u.kprobe.symbol_name,
1082 event_notifier_param->event.u.kprobe.offset,
1083 event_notifier_param->event.u.kprobe.addr,
1084 event_notifier);
1085 if (ret) {
1086 ret = -EINVAL;
1087 goto register_error;
1088 }
1089 ret = try_module_get(event_notifier->desc->owner);
1090 WARN_ON_ONCE(!ret);
1091 break;
8ced8896
FD		 1092 case LTTNG_KERNEL_NOOP:
1093 case LTTNG_KERNEL_SYSCALL:
1094 /*
1095 * Needs to be explicitly enabled after creation, since
1096 * we may want to apply filters.
1097 */
1098 event_notifier->enabled = 0;
1099 event_notifier->registered = 0;
1100 event_notifier->desc = event_desc;
1101 if (!event_notifier->desc) {
1102 ret = -EINVAL;
1103 goto register_error;
1104 }
1105 break;
dffef45d 1106 case LTTNG_KERNEL_UPROBE:
9de67196
FD		 1107 /*
1108 * Needs to be explicitly enabled after creation, since
1109 * we may want to apply filters.
1110 */
1111 event_notifier->enabled = 0;
1112 event_notifier->registered = 1;
1113
1114 /*
1115 * Populate lttng_event_notifier structure before
1116 * event_notifier registration.
1117 */
1118 smp_wmb();
1119
1120 ret = lttng_uprobes_register_event_notifier(
1121 event_notifier_param->event.name,
1122 event_notifier_param->event.u.uprobe.fd,
1123 event_notifier);
1124 if (ret)
1125 goto register_error;
1126 ret = try_module_get(event_notifier->desc->owner);
1127 WARN_ON_ONCE(!ret);
1128 break;
dffef45d
FD		 1129 case LTTNG_KERNEL_KRETPROBE:
1130 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 1131 default:
1132 WARN_ON_ONCE(1);
1133 ret = -EINVAL;
1134 goto register_error;
1135 }
1136
1137 list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head);
1138 hlist_add_head(&event_notifier->hlist, head);
1139 return event_notifier;
1140
1141register_error:
1142 kmem_cache_free(event_notifier_cache, event_notifier);
1143cache_error:
1144exist:
1145type_error:
1146 return ERR_PTR(ret);
1147}
1148
3c997079
MD		 1149struct lttng_event *lttng_event_create(struct lttng_channel *chan,
1150 struct lttng_kernel_event *event_param,
1151 void *filter,
1152 const struct lttng_event_desc *event_desc,
1153 enum lttng_kernel_instrumentation itype)
1154{
1155 struct lttng_event *event;
1156
1157 mutex_lock(&sessions_mutex);
1158 event = _lttng_event_create(chan, event_param, filter, event_desc,
1159 itype);
1160 mutex_unlock(&sessions_mutex);
1161 return event;
1162}
1163
dffef45d
FD		 1164struct lttng_event_notifier *lttng_event_notifier_create(
1165 const struct lttng_event_desc *event_desc,
1166 uint64_t id, struct lttng_event_notifier_group *event_notifier_group,
1167 struct lttng_kernel_event_notifier *event_notifier_param,
1168 void *filter, enum lttng_kernel_instrumentation itype)
1169{
1170 struct lttng_event_notifier *event_notifier;
1171
1172 mutex_lock(&sessions_mutex);
1173 event_notifier = _lttng_event_notifier_create(event_desc, id,
1174 event_notifier_group, event_notifier_param, filter, itype);
1175 mutex_unlock(&sessions_mutex);
1176 return event_notifier;
1177}
1178
3c997079
MD		 1179/* Only used for tracepoints for now. */
1180static
1181void register_event(struct lttng_event *event)
1182{
1183 const struct lttng_event_desc *desc;
f127e61e 1184 int ret = -EINVAL;
3c997079 1185
3c997079
MD		 1186 if (event->registered)
1187 return;
4ecb5ad5 1188
3c997079 1189 desc = event->desc;
4ecb5ad5
MD		 1190 switch (event->instrumentation) {
1191 case LTTNG_KERNEL_TRACEPOINT:
1192 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1193 desc->probe_callback,
1194 event);
1195 break;
1196 case LTTNG_KERNEL_SYSCALL:
2d6d88c6 1197 ret = lttng_syscall_filter_enable_event(event->chan, event);
4ecb5ad5
MD		 1198 break;
1199 case LTTNG_KERNEL_KPROBE:
a344f64b 1200 case LTTNG_KERNEL_UPROBE:
4ecb5ad5 1201 case LTTNG_KERNEL_KRETPROBE:
4ecb5ad5
MD		 1202 case LTTNG_KERNEL_NOOP:
1203 ret = 0;
1204 break;
e884017c 1205 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
4ecb5ad5
MD		 1206 default:
1207 WARN_ON_ONCE(1);
1208 }
3c997079
MD		 1209 if (!ret)
1210 event->registered = 1;
1211}
1212
4e3c1b9b
MD		 1213/*
1214 * Only used internally at session destruction.
1215 */
a90917c3 1216int _lttng_event_unregister(struct lttng_event *event)
4e3c1b9b 1217{
4ecb5ad5 1218 const struct lttng_event_desc *desc;
11b5a3c2
MD		 1219 int ret = -EINVAL;
1220
3c997079
MD		 1221 if (!event->registered)
1222 return 0;
1223
4ecb5ad5 1224 desc = event->desc;
38d024ae 1225 switch (event->instrumentation) {
ab2277d6 1226 case LTTNG_KERNEL_TRACEPOINT:
20591cf7 1227 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
85a9ca7f 1228 event->desc->probe_callback,
11b5a3c2 1229 event);
baf20995 1230 break;
ab2277d6 1231 case LTTNG_KERNEL_KPROBE:
8bf17deb 1232 lttng_kprobes_unregister_event(event);
d6d808f3
MD		 1233 ret = 0;
1234 break;
7371f44c
MD		 1235 case LTTNG_KERNEL_KRETPROBE:
1236 lttng_kretprobes_unregister(event);
1237 ret = 0;
1238 break;
33a39a3c 1239 case LTTNG_KERNEL_SYSCALL:
2d6d88c6 1240 ret = lttng_syscall_filter_disable_event(event->chan, event);
4ecb5ad5
MD		 1241 break;
1242 case LTTNG_KERNEL_NOOP:
259b6cb3
MD		 1243 ret = 0;
1244 break;
149b9a9d 1245 case LTTNG_KERNEL_UPROBE:
83b802dc 1246 lttng_uprobes_unregister_event(event);
149b9a9d
YB		 1247 ret = 0;
1248 break;
e884017c 1249 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
baf20995
MD		 1250 default:
1251 WARN_ON_ONCE(1);
1252 }
3c997079
MD		 1253 if (!ret)
1254 event->registered = 0;
dda6a249
MD		 1255 return ret;
1256}
1257
dffef45d
FD		 1258/* Only used for tracepoints for now. */
1259static
b01155ba 1260void register_event_notifier(struct lttng_event_notifier *event_notifier)
dffef45d
FD		 1261{
1262 const struct lttng_event_desc *desc;
1263 int ret = -EINVAL;
1264
1265 if (event_notifier->registered)
1266 return;
1267
1268 desc = event_notifier->desc;
1269 switch (event_notifier->instrumentation) {
1270 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1271 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1272 desc->event_notifier_callback,
1273 event_notifier);
1274 break;
8ced8896
FD		 1275 case LTTNG_KERNEL_SYSCALL:
1276 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1277 break;
dffef45d 1278 case LTTNG_KERNEL_KPROBE:
9de67196 1279 case LTTNG_KERNEL_UPROBE:
2b16f0c9
FD		 1280 ret = 0;
1281 break;
dffef45d
FD		 1282 case LTTNG_KERNEL_KRETPROBE:
1283 case LTTNG_KERNEL_FUNCTION:
1284 case LTTNG_KERNEL_NOOP:
1285 default:
1286 WARN_ON_ONCE(1);
1287 }
1288 if (!ret)
1289 event_notifier->registered = 1;
1290}
1291
1292static
1293int _lttng_event_notifier_unregister(
1294 struct lttng_event_notifier *event_notifier)
1295{
1296 const struct lttng_event_desc *desc;
1297 int ret = -EINVAL;
1298
1299 if (!event_notifier->registered)
1300 return 0;
1301
1302 desc = event_notifier->desc;
1303 switch (event_notifier->instrumentation) {
1304 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1305 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname,
1306 event_notifier->desc->event_notifier_callback,
1307 event_notifier);
1308 break;
dffef45d 1309 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1310 lttng_kprobes_unregister_event_notifier(event_notifier);
1311 ret = 0;
1312 break;
9de67196
FD		 1313 case LTTNG_KERNEL_UPROBE:
1314 lttng_uprobes_unregister_event_notifier(event_notifier);
1315 ret = 0;
1316 break;
8ced8896
FD		 1317 case LTTNG_KERNEL_SYSCALL:
1318 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1319 break;
dffef45d
FD		 1320 case LTTNG_KERNEL_KRETPROBE:
1321 case LTTNG_KERNEL_FUNCTION:
dffef45d 1322 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1323 default:
1324 WARN_ON_ONCE(1);
1325 }
1326 if (!ret)
1327 event_notifier->registered = 0;
1328 return ret;
1329}
1330
dda6a249
MD		 1331/*
1332 * Only used internally at session destruction.
1333 */
be066e6c 1334static
a90917c3 1335void _lttng_event_destroy(struct lttng_event *event)
dda6a249 1336{
edeb3137
MD		 1337 switch (event->instrumentation) {
1338 case LTTNG_KERNEL_TRACEPOINT:
0bcedee9 1339 lttng_event_desc_put(event->desc);
edeb3137
MD		 1340 break;
1341 case LTTNG_KERNEL_KPROBE:
1342 module_put(event->desc->owner);
8bf17deb 1343 lttng_kprobes_destroy_event_private(event);
edeb3137 1344 break;
7371f44c
MD		 1345 case LTTNG_KERNEL_KRETPROBE:
1346 module_put(event->desc->owner);
1347 lttng_kretprobes_destroy_private(event);
1348 break;
259b6cb3 1349 case LTTNG_KERNEL_NOOP:
33a39a3c 1350 case LTTNG_KERNEL_SYSCALL:
259b6cb3 1351 break;
149b9a9d
YB		 1352 case LTTNG_KERNEL_UPROBE:
1353 module_put(event->desc->owner);
83b802dc 1354 lttng_uprobes_destroy_event_private(event);
149b9a9d 1355 break;
e884017c 1356 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
edeb3137
MD		 1357 default:
1358 WARN_ON_ONCE(1);
1359 }
dda6a249 1360 list_del(&event->list);
8070f5c0 1361 lttng_destroy_context(event->ctx);
11b5a3c2 1362 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 1363}
1364
dffef45d
FD		 1365/*
1366 * Only used internally at session destruction.
1367 */
1368static
1369void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
1370{
1371 switch (event_notifier->instrumentation) {
1372 case LTTNG_KERNEL_TRACEPOINT:
b01155ba
FD		 1373 lttng_event_desc_put(event_notifier->desc);
1374 break;
dffef45d 1375 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1376 module_put(event_notifier->desc->owner);
1377 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1378 break;
8ced8896
FD		 1379 case LTTNG_KERNEL_NOOP:
1380 case LTTNG_KERNEL_SYSCALL:
1381 break;
9de67196
FD		 1382 case LTTNG_KERNEL_UPROBE:
1383 module_put(event_notifier->desc->owner);
1384 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1385 break;
dffef45d
FD		 1386 case LTTNG_KERNEL_KRETPROBE:
1387 case LTTNG_KERNEL_FUNCTION:
dffef45d
FD		 1388 default:
1389 WARN_ON_ONCE(1);
1390 }
1391 list_del(&event_notifier->list);
1392 kmem_cache_free(event_notifier_cache, event_notifier);
1393}
1394
d1f652f8
MD		 1395struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1396 enum tracker_type tracker_type)
e0130fab 1397{
d1f652f8
MD		 1398 switch (tracker_type) {
1399 case TRACKER_PID:
1400 return &session->pid_tracker;
1401 case TRACKER_VPID:
1402 return &session->vpid_tracker;
1403 case TRACKER_UID:
1404 return &session->uid_tracker;
1405 case TRACKER_VUID:
1406 return &session->vuid_tracker;
1407 case TRACKER_GID:
1408 return &session->gid_tracker;
1409 case TRACKER_VGID:
1410 return &session->vgid_tracker;
1411 default:
1412 WARN_ON_ONCE(1);
1413 return NULL;
1414 }
1415}
1416
1417int lttng_session_track_id(struct lttng_session *session,
1418 enum tracker_type tracker_type, int id)
1419{
1420 struct lttng_id_tracker *tracker;
e0130fab
MD		 1421 int ret;
1422
d1f652f8
MD		 1423 tracker = get_tracker(session, tracker_type);
1424 if (!tracker)
1425 return -EINVAL;
1426 if (id < -1)
e0130fab
MD		 1427 return -EINVAL;
1428 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1429 if (id == -1) {
1430 /* track all ids: destroy tracker. */
1431 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1432 ret = 0;
1433 } else {
d1f652f8 1434 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1435 }
e0130fab
MD		 1436 mutex_unlock(&sessions_mutex);
1437 return ret;
1438}
1439
d1f652f8
MD		 1440int lttng_session_untrack_id(struct lttng_session *session,
1441 enum tracker_type tracker_type, int id)
e0130fab 1442{
d1f652f8 1443 struct lttng_id_tracker *tracker;
e0130fab
MD		 1444 int ret;
1445
d1f652f8
MD		 1446 tracker = get_tracker(session, tracker_type);
1447 if (!tracker)
1448 return -EINVAL;
1449 if (id < -1)
e0130fab
MD		 1450 return -EINVAL;
1451 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1452 if (id == -1) {
1453 /* untrack all ids: replace by empty tracker. */
1454 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1455 } else {
d1f652f8 1456 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1457 }
e0130fab
MD		 1458 mutex_unlock(&sessions_mutex);
1459 return ret;
1460}
1461
7e6f9ef6 1462static
d1f652f8 1463void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1464{
d1f652f8
MD		 1465 struct lttng_id_tracker *id_tracker = m->private;
1466 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1467 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1468 int iter = 0, i;
1469
1470 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1471 if (id_tracker_p) {
1472 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1473 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1474
f934e302 1475 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1476 if (iter++ >= *pos)
1477 return e;
1478 }
1479 }
1480 } else {
d1f652f8 1481 /* ID tracker disabled. */
7e6f9ef6 1482 if (iter >= *pos && iter == 0) {
d1f652f8 1483 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1484 }
1485 iter++;
1486 }
1487 /* End of list */
1488 return NULL;
1489}
1490
1491/* Called with sessions_mutex held. */
1492static
d1f652f8 1493void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1494{
d1f652f8
MD		 1495 struct lttng_id_tracker *id_tracker = m->private;
1496 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1497 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1498 int iter = 0, i;
1499
1500 (*ppos)++;
d1f652f8
MD		 1501 if (id_tracker_p) {
1502 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1503 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1504
f934e302 1505 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1506 if (iter++ >= *ppos)
1507 return e;
1508 }
1509 }
1510 } else {
d1f652f8 1511 /* ID tracker disabled. */
7e6f9ef6 1512 if (iter >= *ppos && iter == 0)
d1f652f8 1513 return p; /* empty tracker */
7e6f9ef6
MD		 1514 iter++;
1515 }
1516
1517 /* End of list */
1518 return NULL;
1519}
1520
1521static
d1f652f8 1522void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1523{
1524 mutex_unlock(&sessions_mutex);
1525}
1526
1527static
d1f652f8 1528int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1529{
d1f652f8
MD		 1530 struct lttng_id_tracker *id_tracker = m->private;
1531 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1532 int id;
7e6f9ef6 1533
d1f652f8 1534 if (p == id_tracker_p) {
7e6f9ef6 1535 /* Tracker disabled. */
d1f652f8 1536 id = -1;
7e6f9ef6 1537 } else {
d1f652f8 1538 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1539
d1f652f8
MD		 1540 id = lttng_id_tracker_get_node_id(e);
1541 }
1542 switch (id_tracker->tracker_type) {
1543 case TRACKER_PID:
1544 seq_printf(m, "process { pid = %d; };\n", id);
1545 break;
1546 case TRACKER_VPID:
1547 seq_printf(m, "process { vpid = %d; };\n", id);
1548 break;
1549 case TRACKER_UID:
1550 seq_printf(m, "user { uid = %d; };\n", id);
1551 break;
1552 case TRACKER_VUID:
1553 seq_printf(m, "user { vuid = %d; };\n", id);
1554 break;
1555 case TRACKER_GID:
1556 seq_printf(m, "group { gid = %d; };\n", id);
1557 break;
1558 case TRACKER_VGID:
1559 seq_printf(m, "group { vgid = %d; };\n", id);
1560 break;
1561 default:
1562 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1563 }
7e6f9ef6
MD		 1564 return 0;
1565}
1566
1567static
d1f652f8
MD		 1568const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1569 .start = id_list_start,
1570 .next = id_list_next,
1571 .stop = id_list_stop,
1572 .show = id_list_show,
7e6f9ef6
MD		 1573};
1574
1575static
d1f652f8 1576int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1577{
d1f652f8 1578 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1579}
1580
1581static
d1f652f8 1582int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1583{
1584 struct seq_file *m = file->private_data;
d1f652f8 1585 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1586 int ret;
1587
d1f652f8 1588 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1589 ret = seq_release(inode, file);
d1f652f8
MD		 1590 if (!ret)
1591 fput(id_tracker->session->file);
7e6f9ef6
MD		 1592 return ret;
1593}
1594
d1f652f8 1595const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1596 .owner = THIS_MODULE,
d1f652f8 1597 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1598 .read = seq_read,
1599 .llseek = seq_lseek,
d1f652f8 1600 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1601};
1602
d1f652f8
MD		 1603int lttng_session_list_tracker_ids(struct lttng_session *session,
1604 enum tracker_type tracker_type)
7e6f9ef6 1605{
d1f652f8 1606 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1607 struct seq_file *m;
1608 int file_fd, ret;
1609
1610 file_fd = lttng_get_unused_fd();
1611 if (file_fd < 0) {
1612 ret = file_fd;
1613 goto fd_error;
1614 }
1615
d1f652f8
MD		 1616 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1617 &lttng_tracker_ids_list_fops,
7e6f9ef6 1618 NULL, O_RDWR);
d1f652f8
MD		 1619 if (IS_ERR(tracker_ids_list_file)) {
1620 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1621 goto file_error;
1622 }
98d7281c
MJ		 1623 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1624 ret = -EOVERFLOW;
9c1f4643
MD		 1625 goto refcount_error;
1626 }
d1f652f8 1627 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1628 if (ret < 0)
1629 goto open_error;
d1f652f8
MD		 1630 m = tracker_ids_list_file->private_data;
1631
1632 m->private = get_tracker(session, tracker_type);
1633 BUG_ON(!m->private);
1634 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1635
1636 return file_fd;
1637
1638open_error:
9c1f4643
MD		 1639 atomic_long_dec(&session->file->f_count);
1640refcount_error:
d1f652f8 1641 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1642file_error:
1643 put_unused_fd(file_fd);
1644fd_error:
1645 return ret;
1646}
1647
3c997079
MD		 1648/*
1649 * Enabler management.
1650 */
1651static
4993071a
PP		 1652int lttng_match_enabler_star_glob(const char *desc_name,
1653 const char *pattern)
3c997079 1654{
cbc19040
MD		 1655 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1656 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1657 return 0;
1658 return 1;
1659}
1660
1661static
4ecb5ad5
MD		 1662int lttng_match_enabler_name(const char *desc_name,
1663 const char *name)
3c997079 1664{
4ecb5ad5 1665 if (strcmp(desc_name, name))
3c997079
MD		 1666 return 0;
1667 return 1;
1668}
1669
3c997079
MD		 1670int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1671 struct lttng_enabler *enabler)
1672{
4ecb5ad5 1673 const char *desc_name, *enabler_name;
badfe9f5 1674 bool compat = false, entry = false;
4ecb5ad5
MD		 1675
1676 enabler_name = enabler->event_param.name;
1677 switch (enabler->event_param.instrumentation) {
1678 case LTTNG_KERNEL_TRACEPOINT:
1679 desc_name = desc->name;
3b861b22
FD		 1680 switch (enabler->format_type) {
1681 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1682 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1683 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1684 return lttng_match_enabler_name(desc_name, enabler_name);
1685 default:
1686 return -EINVAL;
1687 }
4ecb5ad5
MD		 1688 break;
1689 case LTTNG_KERNEL_SYSCALL:
1690 desc_name = desc->name;
badfe9f5 1691 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1692 desc_name += strlen("compat_");
badfe9f5
MD		 1693 compat = true;
1694 }
4ecb5ad5
MD		 1695 if (!strncmp(desc_name, "syscall_exit_",
1696 strlen("syscall_exit_"))) {
1697 desc_name += strlen("syscall_exit_");
1698 } else if (!strncmp(desc_name, "syscall_entry_",
1699 strlen("syscall_entry_"))) {
1700 desc_name += strlen("syscall_entry_");
badfe9f5 1701 entry = true;
4ecb5ad5
MD		 1702 } else {
1703 WARN_ON_ONCE(1);
1704 return -EINVAL;
1705 }
badfe9f5
MD		 1706 switch (enabler->event_param.u.syscall.entryexit) {
1707 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1708 break;
1709 case LTTNG_KERNEL_SYSCALL_ENTRY:
1710 if (!entry)
1711 return 0;
1712 break;
1713 case LTTNG_KERNEL_SYSCALL_EXIT:
1714 if (entry)
1715 return 0;
1716 break;
1717 default:
1718 return -EINVAL;
1719 }
1720 switch (enabler->event_param.u.syscall.abi) {
1721 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1722 break;
1723 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1724 if (compat)
1725 return 0;
1726 break;
1727 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1728 if (!compat)
1729 return 0;
1730 break;
1731 default:
1732 return -EINVAL;
1733 }
1734 switch (enabler->event_param.u.syscall.match) {
1735 case LTTNG_SYSCALL_MATCH_NAME:
3b861b22
FD		 1736 switch (enabler->format_type) {
1737 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
badfe9f5 1738 return lttng_match_enabler_star_glob(desc_name, enabler_name);
3b861b22 1739 case LTTNG_ENABLER_FORMAT_NAME:
badfe9f5
MD		 1740 return lttng_match_enabler_name(desc_name, enabler_name);
1741 default:
1742 return -EINVAL;
1743 }
1744 break;
1745 case LTTNG_SYSCALL_MATCH_NR:
1746 return -EINVAL; /* Not implemented. */
1747 default:
1748 return -EINVAL;
1749 }
4ecb5ad5
MD		 1750 break;
1751 default:
1752 WARN_ON_ONCE(1);
1753 return -EINVAL;
1754 }
3c997079
MD		 1755}
1756
1757static
b2bc0bc8
FD		 1758int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
1759 struct lttng_event *event)
3c997079 1760{
b2bc0bc8
FD		 1761 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
1762 event_enabler);
1763
1764 if (base_enabler->event_param.instrumentation != event->instrumentation)
33a39a3c 1765 return 0;
b2bc0bc8
FD		 1766 if (lttng_desc_match_enabler(event->desc, base_enabler)
1767 && event->chan == event_enabler->chan)
3c997079
MD		 1768 return 1;
1769 else
1770 return 0;
1771}
1772
b01155ba
FD		 1773static
1774int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
1775 struct lttng_event_notifier *event_notifier)
1776{
1777 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
1778 event_notifier_enabler);
1779
1780 if (base_enabler->event_param.instrumentation != event_notifier->instrumentation)
1781 return 0;
1782 if (lttng_desc_match_enabler(event_notifier->desc, base_enabler)
1783 && event_notifier->group == event_notifier_enabler->group
1784 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1785 return 1;
1786 else
1787 return 0;
1788}
1789
3c997079 1790static
b2bc0bc8
FD		 1791struct lttng_enabler_ref *lttng_enabler_ref(
1792 struct list_head *enablers_ref_list,
3c997079
MD		 1793 struct lttng_enabler *enabler)
1794{
1795 struct lttng_enabler_ref *enabler_ref;
1796
b2bc0bc8 1797 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
3c997079
MD		 1798 if (enabler_ref->ref == enabler)
1799 return enabler_ref;
1800 }
1801 return NULL;
1802}
1803
3c997079 1804static
1b917d6b 1805void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
3c997079 1806{
b2bc0bc8 1807 struct lttng_session *session = event_enabler->chan->session;
3c997079
MD		 1808 struct lttng_probe_desc *probe_desc;
1809 const struct lttng_event_desc *desc;
1810 int i;
1811 struct list_head *probe_list;
1812
1813 probe_list = lttng_get_probe_list_head();
1814 /*
1815 * For each probe event, if we find that a probe event matches
1816 * our enabler, create an associated lttng_event if not
1817 * already present.
1818 */
1819 list_for_each_entry(probe_desc, probe_list, head) {
1820 for (i = 0; i < probe_desc->nr_events; i++) {
1821 int found = 0;
1822 struct hlist_head *head;
3c997079
MD		 1823 struct lttng_event *event;
1824
1825 desc = probe_desc->event_desc[i];
b2bc0bc8
FD		 1826 if (!lttng_desc_match_enabler(desc,
1827 lttng_event_enabler_as_enabler(event_enabler)))
3c997079 1828 continue;
3c997079
MD		 1829
1830 /*
1831 * Check if already created.
1832 */
4a11ef1c
FD		 1833 head = utils_borrow_hash_table_bucket(
1834 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
1835 desc->name);
d216ecae 1836 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079 1837 if (event->desc == desc
b2bc0bc8 1838 && event->chan == event_enabler->chan)
3c997079
MD		 1839 found = 1;
1840 }
1841 if (found)
1842 continue;
1843
1844 /*
1845 * We need to create an event for this
1846 * event probe.
1847 */
b2bc0bc8 1848 event = _lttng_event_create(event_enabler->chan,
3c997079
MD		 1849 NULL, NULL, desc,
1850 LTTNG_KERNEL_TRACEPOINT);
1851 if (!event) {
5a15f70c 1852 printk(KERN_INFO "LTTng: Unable to create event %s\n",
3c997079
MD		 1853 probe_desc->event_desc[i]->name);
1854 }
1855 }
1856 }
1857}
1858
b01155ba
FD		 1859static
1860void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
1861{
1862 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
1863 struct lttng_probe_desc *probe_desc;
1864 const struct lttng_event_desc *desc;
1865 int i;
1866 struct list_head *probe_list;
1867
1868 probe_list = lttng_get_probe_list_head();
1869 /*
1870 * For each probe event, if we find that a probe event matches
1871 * our enabler, create an associated lttng_event_notifier if not
1872 * already present.
1873 */
1874 list_for_each_entry(probe_desc, probe_list, head) {
1875 for (i = 0; i < probe_desc->nr_events; i++) {
1876 int found = 0;
1877 struct hlist_head *head;
1878 struct lttng_event_notifier *event_notifier;
1879
1880 desc = probe_desc->event_desc[i];
1881 if (!lttng_desc_match_enabler(desc,
1882 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
1883 continue;
1884
1885 /*
1886 * Check if already created.
1887 */
1888 head = utils_borrow_hash_table_bucket(
1889 event_notifier_group->event_notifiers_ht.table,
1890 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
1891 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1892 if (event_notifier->desc == desc
1893 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1894 found = 1;
1895 }
1896 if (found)
1897 continue;
1898
1899 /*
1900 * We need to create a event_notifier for this event probe.
1901 */
1902 event_notifier = _lttng_event_notifier_create(desc,
1903 event_notifier_enabler->base.user_token,
1904 event_notifier_group, NULL, NULL,
1905 LTTNG_KERNEL_TRACEPOINT);
1906 if (IS_ERR(event_notifier)) {
1907 printk(KERN_INFO "Unable to create event_notifier %s\n",
1908 probe_desc->event_desc[i]->name);
1909 }
1910 }
1911 }
1912}
1913
33a39a3c 1914static
1b917d6b 1915void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c
MD		 1916{
1917 int ret;
1918
2d6d88c6 1919 ret = lttng_syscalls_register_event(event_enabler->chan, NULL);
33a39a3c
MD		 1920 WARN_ON_ONCE(ret);
1921}
1922
8ced8896
FD		 1923static
1924void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
1925{
1926 int ret;
1927
1928 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL);
1929 WARN_ON_ONCE(ret);
1930 ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL);
1931 WARN_ON_ONCE(ret);
1932}
1933
33a39a3c
MD		 1934/*
1935 * Create struct lttng_event if it is missing and present in the list of
1936 * tracepoint probes.
1937 * Should be called with sessions mutex held.
1938 */
1939static
b2bc0bc8 1940void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
33a39a3c 1941{
b2bc0bc8 1942 switch (event_enabler->base.event_param.instrumentation) {
33a39a3c 1943 case LTTNG_KERNEL_TRACEPOINT:
1b917d6b 1944 lttng_create_tracepoint_event_if_missing(event_enabler);
33a39a3c
MD		 1945 break;
1946 case LTTNG_KERNEL_SYSCALL:
1b917d6b 1947 lttng_create_syscall_event_if_missing(event_enabler);
33a39a3c
MD		 1948 break;
1949 default:
1950 WARN_ON_ONCE(1);
1951 break;
1952 }
1953}
1954
3c997079 1955/*
b2bc0bc8 1956 * Create events associated with an event_enabler (if not already present),
3c997079
MD		 1957 * and add backward reference from the event to the enabler.
1958 * Should be called with sessions mutex held.
1959 */
1960static
b2bc0bc8 1961int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
3c997079 1962{
b2bc0bc8
FD		 1963 struct lttng_channel *chan = event_enabler->chan;
1964 struct lttng_session *session = event_enabler->chan->session;
1965 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
3c997079
MD		 1966 struct lttng_event *event;
1967
b2bc0bc8
FD		 1968 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
1969 base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT &&
1970 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
1971 base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME &&
1972 !strcmp(base_enabler->event_param.name, "*")) {
1973 if (base_enabler->enabled)
badfe9f5
MD		 1974 WRITE_ONCE(chan->syscall_all, 1);
1975 else
1976 WRITE_ONCE(chan->syscall_all, 0);
1977 }
1978
3c997079 1979 /* First ensure that probe events are created for this enabler. */
b2bc0bc8 1980 lttng_create_event_if_missing(event_enabler);
3c997079 1981
b2bc0bc8 1982 /* For each event matching event_enabler in session event list. */
3c997079
MD		 1983 list_for_each_entry(event, &session->events, list) {
1984 struct lttng_enabler_ref *enabler_ref;
1985
b2bc0bc8 1986 if (!lttng_event_enabler_match_event(event_enabler, event))
3c997079 1987 continue;
b2bc0bc8
FD		 1988 enabler_ref = lttng_enabler_ref(&event->enablers_ref_head,
1989 lttng_event_enabler_as_enabler(event_enabler));
3c997079
MD		 1990 if (!enabler_ref) {
1991 /*
1992 * If no backward ref, create it.
b2bc0bc8 1993 * Add backward ref from event to event_enabler.
3c997079
MD		 1994 */
1995 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
1996 if (!enabler_ref)
1997 return -ENOMEM;
b2bc0bc8 1998 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
3c997079
MD		 1999 list_add(&enabler_ref->node,
2000 &event->enablers_ref_head);
2001 }
2002
f127e61e
MD		 2003 /*
2004 * Link filter bytecodes if not linked yet.
2005 */
2dfda770
FD		 2006 lttng_enabler_link_bytecode(event->desc,
2007 lttng_static_ctx,
2008 &event->bytecode_runtime_head,
2009 lttng_event_enabler_as_enabler(event_enabler));
f127e61e 2010
3c997079
MD		 2011 /* TODO: merge event context. */
2012 }
2013 return 0;
2014}
2015
b01155ba
FD		 2016/*
2017 * Create struct lttng_event_notifier if it is missing and present in the list of
2018 * tracepoint probes.
2019 * Should be called with sessions mutex held.
2020 */
2021static
2022void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2023{
2024 switch (event_notifier_enabler->base.event_param.instrumentation) {
2025 case LTTNG_KERNEL_TRACEPOINT:
2026 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2027 break;
8ced8896
FD		 2028 case LTTNG_KERNEL_SYSCALL:
2029 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2030 break;
b01155ba
FD		 2031 default:
2032 WARN_ON_ONCE(1);
2033 break;
2034 }
2035}
2036
2037/*
2038 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2039 */
2040static
2041int lttng_event_notifier_enabler_ref_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler)
2042{
2043 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2044 struct lttng_event_notifier *event_notifier;
2045
2046 /* First ensure that probe event_notifiers are created for this enabler. */
2047 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2048
2049 /* Link the created event_notifier with its associated enabler. */
2050 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2051 struct lttng_enabler_ref *enabler_ref;
2052
2053 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2054 continue;
2055
2056 enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
2057 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2058 if (!enabler_ref) {
2059 /*
2060 * If no backward ref, create it.
2061 * Add backward ref from event_notifier to enabler.
2062 */
2063 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2064 if (!enabler_ref)
2065 return -ENOMEM;
2066
2067 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2068 event_notifier_enabler);
2069 list_add(&enabler_ref->node,
2070 &event_notifier->enablers_ref_head);
2071 }
2072
2073 /*
2074 * Link filter bytecodes if not linked yet.
2075 */
2076 lttng_enabler_link_bytecode(event_notifier->desc,
2077 lttng_static_ctx, &event_notifier->bytecode_runtime_head,
2078 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2079 }
2080 return 0;
2081}
2082
3c997079
MD		 2083/*
2084 * Called at module load: connect the probe on all enablers matching
2085 * this event.
2086 * Called with sessions lock held.
2087 */
2088int lttng_fix_pending_events(void)
2089{
2090 struct lttng_session *session;
2091
2092 list_for_each_entry(session, &sessions, list)
b2bc0bc8 2093 lttng_session_lazy_sync_event_enablers(session);
3c997079
MD		 2094 return 0;
2095}
2096
b01155ba
FD		 2097static bool lttng_event_notifier_group_has_active_event_notifiers(
2098 struct lttng_event_notifier_group *event_notifier_group)
2099{
2100 struct lttng_event_notifier_enabler *event_notifier_enabler;
2101
2102 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2103 node) {
2104 if (event_notifier_enabler->base.enabled)
2105 return true;
2106 }
2107 return false;
2108}
2109
2110bool lttng_event_notifier_active(void)
2111{
2112 struct lttng_event_notifier_group *event_notifier_group;
2113
2114 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2115 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2116 return true;
2117 }
2118 return false;
2119}
2120
2121int lttng_fix_pending_event_notifiers(void)
2122{
2123 struct lttng_event_notifier_group *event_notifier_group;
2124
2125 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2126 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2127 return 0;
2128}
2129
b2bc0bc8
FD		 2130struct lttng_event_enabler *lttng_event_enabler_create(
2131 enum lttng_enabler_format_type format_type,
3c997079
MD		 2132 struct lttng_kernel_event *event_param,
2133 struct lttng_channel *chan)
2134{
b2bc0bc8 2135 struct lttng_event_enabler *event_enabler;
3c997079 2136
b2bc0bc8
FD		 2137 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2138 if (!event_enabler)
3c997079 2139 return NULL;
b2bc0bc8
FD		 2140 event_enabler->base.format_type = format_type;
2141 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2142 memcpy(&event_enabler->base.event_param, event_param,
2143 sizeof(event_enabler->base.event_param));
2144 event_enabler->chan = chan;
3c997079 2145 /* ctx left NULL */
b2bc0bc8
FD		 2146 event_enabler->base.enabled = 0;
2147 event_enabler->base.evtype = LTTNG_TYPE_ENABLER;
3c997079 2148 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2149 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2150 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079 2151 mutex_unlock(&sessions_mutex);
b2bc0bc8 2152 return event_enabler;
3c997079
MD		 2153}
2154
b2bc0bc8 2155int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2156{
2157 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2158 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2159 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2160 mutex_unlock(&sessions_mutex);
2161 return 0;
2162}
2163
b2bc0bc8 2164int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
3c997079
MD		 2165{
2166 mutex_lock(&sessions_mutex);
b2bc0bc8
FD		 2167 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2168 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
3c997079
MD		 2169 mutex_unlock(&sessions_mutex);
2170 return 0;
2171}
2172
b2bc0bc8 2173static
07dfc1d0
MD		 2174int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
2175 struct lttng_kernel_filter_bytecode __user *bytecode)
2176{
2177 struct lttng_filter_bytecode_node *bytecode_node;
2178 uint32_t bytecode_len;
2179 int ret;
2180
2181 ret = get_user(bytecode_len, &bytecode->len);
2182 if (ret)
2183 return ret;
2184 bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len,
2185 GFP_KERNEL);
2186 if (!bytecode_node)
2187 return -ENOMEM;
2188 ret = copy_from_user(&bytecode_node->bc, bytecode,
2189 sizeof(*bytecode) + bytecode_len);
2190 if (ret)
2191 goto error_free;
b2bc0bc8 2192
07dfc1d0
MD		 2193 bytecode_node->enabler = enabler;
2194 /* Enforce length based on allocated size */
2195 bytecode_node->bc.len = bytecode_len;
2196 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
b2bc0bc8 2197
07dfc1d0
MD		 2198 return 0;
2199
2200error_free:
2201 kfree(bytecode_node);
2202 return ret;
2203}
2204
b2bc0bc8
FD		 2205int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler,
2206 struct lttng_kernel_filter_bytecode __user *bytecode)
2207{
2208 int ret;
2209 ret = lttng_enabler_attach_bytecode(
2210 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2211 if (ret)
2212 goto error;
2213
2214 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2215 return 0;
2216
2217error:
2218 return ret;
2219}
2220
3aed4dca
FD		 2221int lttng_event_add_callsite(struct lttng_event *event,
2222 struct lttng_kernel_event_callsite __user *callsite)
2223{
2224
2225 switch (event->instrumentation) {
2226 case LTTNG_KERNEL_UPROBE:
83b802dc 2227 return lttng_uprobes_event_add_callsite(event, callsite);
3aed4dca
FD		 2228 default:
2229 return -EINVAL;
2230 }
2231}
2232
b2bc0bc8 2233int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler,
3c997079
MD		 2234 struct lttng_kernel_context *context_param)
2235{
2236 return -ENOSYS;
2237}
2238
2239static
2240void lttng_enabler_destroy(struct lttng_enabler *enabler)
2241{
07dfc1d0
MD		 2242 struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node;
2243
2244 /* Destroy filter bytecode */
2245 list_for_each_entry_safe(filter_node, tmp_filter_node,
2246 &enabler->filter_bytecode_head, node) {
2247 kfree(filter_node);
2248 }
b2bc0bc8
FD		 2249}
2250
2251static
2252void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2253{
2254 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
07dfc1d0 2255
3c997079 2256 /* Destroy contexts */
b2bc0bc8 2257 lttng_destroy_context(event_enabler->ctx);
3c997079 2258
b2bc0bc8
FD		 2259 list_del(&event_enabler->node);
2260 kfree(event_enabler);
3c997079
MD		 2261}
2262
dffef45d
FD		 2263struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2264 struct lttng_event_notifier_group *event_notifier_group,
2265 enum lttng_enabler_format_type format_type,
2266 struct lttng_kernel_event_notifier *event_notifier_param)
2267{
2268 struct lttng_event_notifier_enabler *event_notifier_enabler;
2269
2270 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2271 if (!event_notifier_enabler)
2272 return NULL;
2273
2274 event_notifier_enabler->base.format_type = format_type;
2275 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
2276
2277 memcpy(&event_notifier_enabler->base.event_param.name, event_notifier_param->event.name,
2278 sizeof(event_notifier_enabler->base.event_param.name));
2279 event_notifier_enabler->base.event_param.instrumentation = event_notifier_param->event.instrumentation;
2280 event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER;
2281
2282 event_notifier_enabler->base.enabled = 0;
2283 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2284 event_notifier_enabler->group = event_notifier_group;
2285
2286 mutex_lock(&sessions_mutex);
2287 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
b01155ba 2288 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2289
2290 mutex_unlock(&sessions_mutex);
2291
2292 return event_notifier_enabler;
2293}
2294
2295int lttng_event_notifier_enabler_enable(
2296 struct lttng_event_notifier_enabler *event_notifier_enabler)
2297{
2298 mutex_lock(&sessions_mutex);
2299 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
b01155ba 2300 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2301 mutex_unlock(&sessions_mutex);
2302 return 0;
2303}
2304
2305int lttng_event_notifier_enabler_disable(
2306 struct lttng_event_notifier_enabler *event_notifier_enabler)
2307{
2308 mutex_lock(&sessions_mutex);
2309 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
b01155ba 2310 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2311 mutex_unlock(&sessions_mutex);
2312 return 0;
2313}
2314
2315int lttng_event_notifier_enabler_attach_bytecode(
2316 struct lttng_event_notifier_enabler *event_notifier_enabler,
2317 struct lttng_kernel_filter_bytecode __user *bytecode)
2318{
2319 int ret;
2320
2321 ret = lttng_enabler_attach_bytecode(
2322 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2323 bytecode);
2324 if (ret)
2325 goto error;
2326
b01155ba 2327 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
dffef45d
FD		 2328 return 0;
2329
2330error:
2331 return ret;
2332}
2333
9de67196
FD		 2334int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
2335 struct lttng_kernel_event_callsite __user *callsite)
2336{
2337
2338 switch (event_notifier->instrumentation) {
2339 case LTTNG_KERNEL_UPROBE:
2340 return lttng_uprobes_event_notifier_add_callsite(event_notifier,
2341 callsite);
2342 default:
2343 return -EINVAL;
2344 }
2345}
2346
dffef45d
FD		 2347int lttng_event_notifier_enabler_attach_context(
2348 struct lttng_event_notifier_enabler *event_notifier_enabler,
2349 struct lttng_kernel_context *context_param)
2350{
2351 return -ENOSYS;
2352}
2353
2354static
2355void lttng_event_notifier_enabler_destroy(
2356 struct lttng_event_notifier_enabler *event_notifier_enabler)
2357{
2358 if (!event_notifier_enabler) {
2359 return;
2360 }
2361
2362 list_del(&event_notifier_enabler->node);
2363
2364 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2365 kfree(event_notifier_enabler);
2366}
2367
3c997079 2368/*
b2bc0bc8 2369 * lttng_session_sync_event_enablers should be called just before starting a
3c997079
MD		 2370 * session.
2371 * Should be called with sessions mutex held.
2372 */
2373static
b2bc0bc8 2374void lttng_session_sync_event_enablers(struct lttng_session *session)
3c997079 2375{
b2bc0bc8 2376 struct lttng_event_enabler *event_enabler;
3c997079
MD		 2377 struct lttng_event *event;
2378
b2bc0bc8
FD		 2379 list_for_each_entry(event_enabler, &session->enablers_head, node)
2380 lttng_event_enabler_ref_events(event_enabler);
3c997079
MD		 2381 /*
2382 * For each event, if at least one of its enablers is enabled,
2383 * and its channel and session transient states are enabled, we
2384 * enable the event, else we disable it.
2385 */
2386 list_for_each_entry(event, &session->events, list) {
2387 struct lttng_enabler_ref *enabler_ref;
07dfc1d0
MD		 2388 struct lttng_bytecode_runtime *runtime;
2389 int enabled = 0, has_enablers_without_bytecode = 0;
3c997079 2390
4ecb5ad5
MD		 2391 switch (event->instrumentation) {
2392 case LTTNG_KERNEL_TRACEPOINT:
2393 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 2394 /* Enable events */
2395 list_for_each_entry(enabler_ref,
2396 &event->enablers_ref_head, node) {
2397 if (enabler_ref->ref->enabled) {
2398 enabled = 1;
2399 break;
2400 }
2401 }
4ecb5ad5
MD		 2402 break;
2403 default:
3c997079
MD		 2404 /* Not handled with lazy sync. */
2405 continue;
2406 }
2407 /*
2408 * Enabled state is based on union of enablers, with
2409 * intesection of session and channel transient enable
2410 * states.
2411 */
2412 enabled = enabled && session->tstate && event->chan->tstate;
2413
a8f2d0c7 2414 WRITE_ONCE(event->enabled, enabled);
3c997079
MD		 2415 /*
2416 * Sync tracepoint registration with event enabled
2417 * state.
2418 */
2419 if (enabled) {
2420 register_event(event);
2421 } else {
2422 _lttng_event_unregister(event);
2423 }
07dfc1d0
MD		 2424
2425 /* Check if has enablers without bytecode enabled */
2426 list_for_each_entry(enabler_ref,
2427 &event->enablers_ref_head, node) {
2428 if (enabler_ref->ref->enabled
2429 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2430 has_enablers_without_bytecode = 1;
2431 break;
2432 }
2433 }
2434 event->has_enablers_without_bytecode =
2435 has_enablers_without_bytecode;
2436
2437 /* Enable filters */
2438 list_for_each_entry(runtime,
f127e61e 2439 &event->bytecode_runtime_head, node)
07dfc1d0 2440 lttng_filter_sync_state(runtime);
3c997079
MD		 2441 }
2442}
2443
2444/*
2445 * Apply enablers to session events, adding events to session if need
2446 * be. It is required after each modification applied to an active
2447 * session, and right before session "start".
2448 * "lazy" sync means we only sync if required.
2449 * Should be called with sessions mutex held.
2450 */
2451static
b2bc0bc8 2452void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
3c997079
MD		 2453{
2454 /* We can skip if session is not active */
2455 if (!session->active)
2456 return;
b2bc0bc8 2457 lttng_session_sync_event_enablers(session);
3c997079
MD		 2458}
2459
b01155ba
FD		 2460static
2461void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2462{
2463 struct lttng_event_notifier_enabler *event_notifier_enabler;
2464 struct lttng_event_notifier *event_notifier;
2465
2466 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2467 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2468
2469 /*
2470 * For each event_notifier, if at least one of its enablers is enabled,
2471 * we enable the event_notifier, else we disable it.
2472 */
2473 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2474 struct lttng_enabler_ref *enabler_ref;
2475 struct lttng_bytecode_runtime *runtime;
2476 int enabled = 0, has_enablers_without_bytecode = 0;
2477
2478 switch (event_notifier->instrumentation) {
2479 case LTTNG_KERNEL_TRACEPOINT:
2480 case LTTNG_KERNEL_SYSCALL:
2481 /* Enable event_notifiers */
2482 list_for_each_entry(enabler_ref,
2483 &event_notifier->enablers_ref_head, node) {
2484 if (enabler_ref->ref->enabled) {
2485 enabled = 1;
2486 break;
2487 }
2488 }
2489 break;
2490 default:
2491 /* Not handled with sync. */
2492 continue;
2493 }
2494
2495 WRITE_ONCE(event_notifier->enabled, enabled);
2496 /*
2497 * Sync tracepoint registration with event_notifier enabled
2498 * state.
2499 */
2500 if (enabled) {
2501 if (!event_notifier->registered)
2502 register_event_notifier(event_notifier);
2503 } else {
2504 if (event_notifier->registered)
2505 _lttng_event_notifier_unregister(event_notifier);
2506 }
2507
2508 /* Check if has enablers without bytecode enabled */
2509 list_for_each_entry(enabler_ref,
2510 &event_notifier->enablers_ref_head, node) {
2511 if (enabler_ref->ref->enabled
2512 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2513 has_enablers_without_bytecode = 1;
2514 break;
2515 }
2516 }
2517 event_notifier->has_enablers_without_bytecode =
2518 has_enablers_without_bytecode;
2519
2520 /* Enable filters */
2521 list_for_each_entry(runtime,
2522 &event_notifier->bytecode_runtime_head, node)
2523 lttng_filter_sync_state(runtime);
2524 }
2525}
2526
1ec3f75a 2527/*
d83004aa
JD		 2528 * Serialize at most one packet worth of metadata into a metadata
2529 * channel.
92d9f5e6
MD		 2530 * We grab the metadata cache mutex to get exclusive access to our metadata
2531 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2532 * allows us to do racy operations such as looking for remaining space left in
2533 * packet and write, since mutual exclusion protects us from concurrent writes.
2534 * Mutual exclusion on the metadata cache allow us to read the cache content
2535 * without racing against reallocation of the cache by updates.
35097f36
JD		 2536 * Returns the number of bytes written in the channel, 0 if no data
2537 * was written and a negative value on error.
1ec3f75a 2538 */
b3b8072b 2539int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
8b97fd42 2540 struct channel *chan, bool *coherent)
d83004aa
JD		 2541{
2542 struct lib_ring_buffer_ctx ctx;
2543 int ret = 0;
2544 size_t len, reserve_len;
2545
f613e3e6 2546 /*
92d9f5e6
MD		 2547 * Ensure we support mutiple get_next / put sequences followed by
2548 * put_next. The metadata cache lock protects reading the metadata
2549 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2550 * "flush" operations on the buffer invoked by different processes.
2551 * Moreover, since the metadata cache memory can be reallocated, we
2552 * need to have exclusive access against updates even though we only
2553 * read it.
f613e3e6 2554 */
92d9f5e6 2555 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 2556 WARN_ON(stream->metadata_in < stream->metadata_out);
2557 if (stream->metadata_in != stream->metadata_out)
de23d59d 2558 goto end;
f613e3e6 2559
9616f0bf
JD		 2560 /* Metadata regenerated, change the version. */
2561 if (stream->metadata_cache->version != stream->version)
2562 stream->version = stream->metadata_cache->version;
2563
d83004aa 2564 len = stream->metadata_cache->metadata_written -
f613e3e6 2565 stream->metadata_in;
9de2c215 2566 if (!len)
de23d59d 2567 goto end;
d83004aa 2568 reserve_len = min_t(size_t,
b3b8072b 2569 stream->transport->ops.packet_avail_size(chan),
d83004aa 2570 len);
b3b8072b 2571 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
d83004aa
JD		 2572 sizeof(char), -1);
2573 /*
2574 * If reservation failed, return an error to the caller.
2575 */
b3b8072b 2576 ret = stream->transport->ops.event_reserve(&ctx, 0);
d83004aa
JD		 2577 if (ret != 0) {
2578 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
8b97fd42 2579 stream->coherent = false;
d83004aa
JD		 2580 goto end;
2581 }
b3b8072b 2582 stream->transport->ops.event_write(&ctx,
f613e3e6 2583 stream->metadata_cache->data + stream->metadata_in,
d83004aa 2584 reserve_len);
b3b8072b 2585 stream->transport->ops.event_commit(&ctx);
f613e3e6 2586 stream->metadata_in += reserve_len;
3e75e2a7 2587 if (reserve_len < len)
8b97fd42
MD		 2588 stream->coherent = false;
2589 else
2590 stream->coherent = true;
d83004aa
JD		 2591 ret = reserve_len;
2592
2593end:
8b97fd42
MD		 2594 if (coherent)
2595 *coherent = stream->coherent;
92d9f5e6 2596 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 2597 return ret;
2598}
2599
8b97fd42
MD		 2600static
2601void lttng_metadata_begin(struct lttng_session *session)
2602{
3e75e2a7
MD		 2603 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2604 mutex_lock(&session->metadata_cache->lock);
8b97fd42
MD		 2605}
2606
2607static
2608void lttng_metadata_end(struct lttng_session *session)
2609{
3e75e2a7
MD		 2610 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2611 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2612 struct lttng_metadata_stream *stream;
2613
3e75e2a7
MD		 2614 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2615 wake_up_interruptible(&stream->read_wait);
92143b2c 2616 mutex_unlock(&session->metadata_cache->lock);
3e75e2a7 2617 }
8b97fd42
MD		 2618}
2619
d83004aa
JD		 2620/*
2621 * Write the metadata to the metadata cache.
2622 * Must be called with sessions_mutex held.
92d9f5e6
MD		 2623 * The metadata cache lock protects us from concurrent read access from
2624 * thread outputting metadata content to ring buffer.
8b97fd42
MD		 2625 * The content of the printf is printed as a single atomic metadata
2626 * transaction.
d83004aa 2627 */
a90917c3 2628int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 2629 const char *fmt, ...)
2630{
c099397a 2631 char *str;
d83004aa 2632 size_t len;
c099397a
MD		 2633 va_list ap;
2634
585e5dcc 2635 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 2636
2637 va_start(ap, fmt);
2638 str = kvasprintf(GFP_KERNEL, fmt, ap);
2639 va_end(ap);
2640 if (!str)
2641 return -ENOMEM;
2642
1ec3f75a 2643 len = strlen(str);
3e75e2a7 2644 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 2645 if (session->metadata_cache->metadata_written + len >
2646 session->metadata_cache->cache_alloc) {
2647 char *tmp_cache_realloc;
2648 unsigned int tmp_cache_alloc_size;
2649
2650 tmp_cache_alloc_size = max_t(unsigned int,
2651 session->metadata_cache->cache_alloc + len,
2652 session->metadata_cache->cache_alloc << 1);
0ca42eb7 2653 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 2654 if (!tmp_cache_realloc)
2655 goto err;
a606b6e8
ML		 2656 if (session->metadata_cache->data) {
2657 memcpy(tmp_cache_realloc,
2658 session->metadata_cache->data,
2659 session->metadata_cache->cache_alloc);
2660 vfree(session->metadata_cache->data);
2661 }
2662
d83004aa
JD		 2663 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2664 session->metadata_cache->data = tmp_cache_realloc;
c099397a 2665 }
d83004aa
JD		 2666 memcpy(session->metadata_cache->data +
2667 session->metadata_cache->metadata_written,
2668 str, len);
2669 session->metadata_cache->metadata_written += len;
c099397a 2670 kfree(str);
d83004aa 2671
d83004aa
JD		 2672 return 0;
2673
2674err:
2675 kfree(str);
2676 return -ENOMEM;
c099397a
MD		 2677}
2678
f513b2bf
MD		 2679static
2680int print_tabs(struct lttng_session *session, size_t nesting)
2681{
2682 size_t i;
2683
2684 for (i = 0; i < nesting; i++) {
2685 int ret;
2686
2687 ret = lttng_metadata_printf(session, " ");
2688 if (ret) {
2689 return ret;
2690 }
2691 }
2692 return 0;
2693}
2694
ceabb767
MD		 2695static
2696int lttng_field_name_statedump(struct lttng_session *session,
2697 const struct lttng_event_field *field,
2698 size_t nesting)
2699{
2700 return lttng_metadata_printf(session, " _%s;\n", field->name);
2701}
2702
2703static
2704int _lttng_integer_type_statedump(struct lttng_session *session,
2705 const struct lttng_type *type,
2706 size_t nesting)
2707{
2708 int ret;
2709
2710 WARN_ON_ONCE(type->atype != atype_integer);
2711 ret = print_tabs(session, nesting);
2712 if (ret)
2713 return ret;
2714 ret = lttng_metadata_printf(session,
2715 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2716 type->u.integer.size,
2717 type->u.integer.alignment,
2718 type->u.integer.signedness,
2719 (type->u.integer.encoding == lttng_encode_none)
2720 ? "none"
2721 : (type->u.integer.encoding == lttng_encode_UTF8)
2722 ? "UTF8"
2723 : "ASCII",
2724 type->u.integer.base,
2725#if __BYTE_ORDER == __BIG_ENDIAN
2726 type->u.integer.reverse_byte_order ? " byte_order = le;" : ""
2727#else
2728 type->u.integer.reverse_byte_order ? " byte_order = be;" : ""
2729#endif
2730 );
2731 return ret;
2732}
2733
f513b2bf
MD		 2734/*
2735 * Must be called with sessions_mutex held.
2736 */
2737static
2738int _lttng_struct_type_statedump(struct lttng_session *session,
2739 const struct lttng_type *type,
2740 size_t nesting)
2741{
2742 int ret;
2743 uint32_t i, nr_fields;
ceabb767
MD		 2744 unsigned int alignment;
2745
2746 WARN_ON_ONCE(type->atype != atype_struct_nestable);
f513b2bf
MD		 2747
2748 ret = print_tabs(session, nesting);
2749 if (ret)
2750 return ret;
2751 ret = lttng_metadata_printf(session,
2752 "struct {\n");
2753 if (ret)
2754 return ret;
ceabb767 2755 nr_fields = type->u.struct_nestable.nr_fields;
f513b2bf
MD		 2756 for (i = 0; i < nr_fields; i++) {
2757 const struct lttng_event_field *iter_field;
2758
ceabb767 2759 iter_field = &type->u.struct_nestable.fields[i];
f513b2bf
MD		 2760 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2761 if (ret)
2762 return ret;
2763 }
2764 ret = print_tabs(session, nesting);
2765 if (ret)
2766 return ret;
ceabb767
MD		 2767 alignment = type->u.struct_nestable.alignment;
2768 if (alignment) {
2769 ret = lttng_metadata_printf(session,
2770 "} align(%u)",
2771 alignment);
2772 } else {
2773 ret = lttng_metadata_printf(session,
2774 "}");
2775 }
f513b2bf
MD		 2776 return ret;
2777}
2778
2779/*
2780 * Must be called with sessions_mutex held.
2781 */
2782static
ceabb767 2783int _lttng_struct_field_statedump(struct lttng_session *session,
f513b2bf
MD		 2784 const struct lttng_event_field *field,
2785 size_t nesting)
2786{
2787 int ret;
2788
2789 ret = _lttng_struct_type_statedump(session,
2790 &field->type, nesting);
2791 if (ret)
2792 return ret;
ceabb767 2793 return lttng_field_name_statedump(session, field, nesting);
f513b2bf
MD		 2794}
2795
65c85aa6
MD		 2796/*
2797 * Must be called with sessions_mutex held.
2798 */
2799static
2800int _lttng_variant_type_statedump(struct lttng_session *session,
2801 const struct lttng_type *type,
2802 size_t nesting)
2803{
2804 int ret;
2805 uint32_t i, nr_choices;
2806
ceabb767
MD		 2807 WARN_ON_ONCE(type->atype != atype_variant_nestable);
2808 /*
2809 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2810 */
2811 if (type->u.variant_nestable.alignment != 0)
2812 return -EINVAL;
65c85aa6
MD		 2813 ret = print_tabs(session, nesting);
2814 if (ret)
2815 return ret;
2816 ret = lttng_metadata_printf(session,
2817 "variant <_%s> {\n",
ceabb767 2818 type->u.variant_nestable.tag_name);
65c85aa6
MD		 2819 if (ret)
2820 return ret;
ceabb767 2821 nr_choices = type->u.variant_nestable.nr_choices;
65c85aa6
MD		 2822 for (i = 0; i < nr_choices; i++) {
2823 const struct lttng_event_field *iter_field;
2824
ceabb767 2825 iter_field = &type->u.variant_nestable.choices[i];
65c85aa6
MD		 2826 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2827 if (ret)
2828 return ret;
2829 }
2830 ret = print_tabs(session, nesting);
2831 if (ret)
2832 return ret;
2833 ret = lttng_metadata_printf(session,
2834 "}");
2835 return ret;
2836}
2837
2838/*
2839 * Must be called with sessions_mutex held.
2840 */
2841static
ceabb767 2842int _lttng_variant_field_statedump(struct lttng_session *session,
65c85aa6
MD		 2843 const struct lttng_event_field *field,
2844 size_t nesting)
2845{
2846 int ret;
2847
2848 ret = _lttng_variant_type_statedump(session,
2849 &field->type, nesting);
2850 if (ret)
2851 return ret;
ceabb767 2852 return lttng_field_name_statedump(session, field, nesting);
65c85aa6
MD		 2853}
2854
f513b2bf
MD		 2855/*
2856 * Must be called with sessions_mutex held.
2857 */
2858static
ceabb767 2859int _lttng_array_field_statedump(struct lttng_session *session,
f513b2bf
MD		 2860 const struct lttng_event_field *field,
2861 size_t nesting)
2862{
2863 int ret;
2864 const struct lttng_type *elem_type;
2865
ceabb767
MD		 2866 WARN_ON_ONCE(field->type.atype != atype_array_nestable);
2867
2868 if (field->type.u.array_nestable.alignment) {
2869 ret = print_tabs(session, nesting);
f513b2bf
MD		 2870 if (ret)
2871 return ret;
ceabb767
MD		 2872 ret = lttng_metadata_printf(session,
2873 "struct { } align(%u) _%s_padding;\n",
2874 field->type.u.array_nestable.alignment * CHAR_BIT,
2875 field->name);
2876 if (ret)
2877 return ret;
2878 }
2879 /*
2880 * Nested compound types: Only array of structures and variants are
2881 * currently supported.
2882 */
2883 elem_type = field->type.u.array_nestable.elem_type;
2884 switch (elem_type->atype) {
2885 case atype_integer:
2886 case atype_struct_nestable:
2887 case atype_variant_nestable:
2888 ret = _lttng_type_statedump(session, elem_type, nesting);
65c85aa6
MD		 2889 if (ret)
2890 return ret;
2891 break;
ceabb767 2892
f513b2bf
MD		 2893 default:
2894 return -EINVAL;
2895 }
2896 ret = lttng_metadata_printf(session,
2897 " _%s[%u];\n",
2898 field->name,
ceabb767 2899 field->type.u.array_nestable.length);
f513b2bf
MD		 2900 return ret;
2901}
2902
2903/*
2904 * Must be called with sessions_mutex held.
2905 */
2906static
ceabb767 2907int _lttng_sequence_field_statedump(struct lttng_session *session,
f513b2bf
MD		 2908 const struct lttng_event_field *field,
2909 size_t nesting)
2910{
2911 int ret;
2912 const char *length_name;
2913 const struct lttng_type *elem_type;
2914
ceabb767 2915 WARN_ON_ONCE(field->type.atype != atype_sequence_nestable);
f513b2bf 2916
ceabb767
MD		 2917 length_name = field->type.u.sequence_nestable.length_name;
2918
2919 if (field->type.u.sequence_nestable.alignment) {
2920 ret = print_tabs(session, nesting);
f513b2bf
MD		 2921 if (ret)
2922 return ret;
ceabb767
MD		 2923 ret = lttng_metadata_printf(session,
2924 "struct { } align(%u) _%s_padding;\n",
2925 field->type.u.sequence_nestable.alignment * CHAR_BIT,
2926 field->name);
2927 if (ret)
2928 return ret;
2929 }
2930
2931 /*
2932 * Nested compound types: Only array of structures and variants are
2933 * currently supported.
2934 */
2935 elem_type = field->type.u.sequence_nestable.elem_type;
2936 switch (elem_type->atype) {
2937 case atype_integer:
2938 case atype_struct_nestable:
2939 case atype_variant_nestable:
2940 ret = _lttng_type_statedump(session, elem_type, nesting);
65c85aa6
MD		 2941 if (ret)
2942 return ret;
2943 break;
ceabb767 2944
f513b2bf
MD		 2945 default:
2946 return -EINVAL;
2947 }
2948 ret = lttng_metadata_printf(session,
2949 " _%s[ _%s ];\n",
2950 field->name,
ceabb767 2951 field->type.u.sequence_nestable.length_name);
f513b2bf
MD		 2952 return ret;
2953}
2954
141ddf28
MD		 2955/*
2956 * Must be called with sessions_mutex held.
2957 */
2958static
ceabb767
MD		 2959int _lttng_enum_type_statedump(struct lttng_session *session,
2960 const struct lttng_type *type,
141ddf28
MD		 2961 size_t nesting)
2962{
2963 const struct lttng_enum_desc *enum_desc;
ceabb767 2964 const struct lttng_type *container_type;
141ddf28
MD		 2965 int ret;
2966 unsigned int i, nr_entries;
2967
ceabb767
MD		 2968 container_type = type->u.enum_nestable.container_type;
2969 if (container_type->atype != atype_integer) {
2970 ret = -EINVAL;
2971 goto end;
2972 }
2973 enum_desc = type->u.enum_nestable.desc;
141ddf28
MD		 2974 nr_entries = enum_desc->nr_entries;
2975
2976 ret = print_tabs(session, nesting);
2977 if (ret)
2978 goto end;
ceabb767
MD		 2979 ret = lttng_metadata_printf(session, "enum : ");
2980 if (ret)
2981 goto end;
2982 ret = _lttng_integer_type_statedump(session, container_type, 0);
141ddf28 2983 if (ret)
ceabb767
MD		 2984 goto end;
2985 ret = lttng_metadata_printf(session, " {\n");
2986 if (ret)
2987 goto end;
141ddf28
MD		 2988 /* Dump all entries */
2989 for (i = 0; i < nr_entries; i++) {
2990 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
2991 int j, len;
2992
2993 ret = print_tabs(session, nesting + 1);
2994 if (ret)
2995 goto end;
2996 ret = lttng_metadata_printf(session,
2997 "\"");
2998 if (ret)
2999 goto end;
3000 len = strlen(entry->string);
3001 /* Escape the character '"' */
3002 for (j = 0; j < len; j++) {
3003 char c = entry->string[j];
3004
3005 switch (c) {
3006 case '"':
3007 ret = lttng_metadata_printf(session,
3008 "\\\"");
3009 break;
3010 case '\\':
3011 ret = lttng_metadata_printf(session,
3012 "\\\\");
3013 break;
3014 default:
3015 ret = lttng_metadata_printf(session,
3016 "%c", c);
3017 break;
3018 }
3019 if (ret)
3020 goto end;
3021 }
08ad1061
PP		 3022 ret = lttng_metadata_printf(session, "\"");
3023 if (ret)
3024 goto end;
3025
3026 if (entry->options.is_auto) {
3027 ret = lttng_metadata_printf(session, ",\n");
3028 if (ret)
3029 goto end;
141ddf28 3030 } else {
7c559490
MD		 3031 ret = lttng_metadata_printf(session,
3032 " = ");
3033 if (ret)
3034 goto end;
3035 if (entry->start.signedness)
141ddf28 3036 ret = lttng_metadata_printf(session,
7c559490
MD		 3037 "%lld", (long long) entry->start.value);
3038 else
3039 ret = lttng_metadata_printf(session,
3040 "%llu", entry->start.value);
3041 if (ret)
3042 goto end;
3043 if (entry->start.signedness == entry->end.signedness &&
3044 entry->start.value
3045 == entry->end.value) {
141ddf28 3046 ret = lttng_metadata_printf(session,
7c559490
MD		 3047 ",\n");
3048 } else {
3049 if (entry->end.signedness) {
3050 ret = lttng_metadata_printf(session,
3051 " ... %lld,\n",
3052 (long long) entry->end.value);
3053 } else {
3054 ret = lttng_metadata_printf(session,
3055 " ... %llu,\n",
3056 entry->end.value);
3057 }
141ddf28 3058 }
7c559490
MD		 3059 if (ret)
3060 goto end;
141ddf28 3061 }
141ddf28
MD		 3062 }
3063 ret = print_tabs(session, nesting);
3064 if (ret)
3065 goto end;
ceabb767 3066 ret = lttng_metadata_printf(session, "}");
141ddf28
MD		 3067end:
3068 return ret;
3069}
3070
d83004aa
JD		 3071/*
3072 * Must be called with sessions_mutex held.
3073 */
c099397a 3074static
ceabb767
MD		 3075int _lttng_enum_field_statedump(struct lttng_session *session,
3076 const struct lttng_event_field *field,
3077 size_t nesting)
3078{
3079 int ret;
3080
3081 ret = _lttng_enum_type_statedump(session, &field->type, nesting);
3082 if (ret)
3083 return ret;
3084 return lttng_field_name_statedump(session, field, nesting);
3085}
3086
3087static
3088int _lttng_integer_field_statedump(struct lttng_session *session,
3089 const struct lttng_event_field *field,
3090 size_t nesting)
3091{
3092 int ret;
3093
3094 ret = _lttng_integer_type_statedump(session, &field->type, nesting);
3095 if (ret)
3096 return ret;
3097 return lttng_field_name_statedump(session, field, nesting);
3098}
3099
3100static
3101int _lttng_string_type_statedump(struct lttng_session *session,
3102 const struct lttng_type *type,
3103 size_t nesting)
3104{
3105 int ret;
3106
3107 WARN_ON_ONCE(type->atype != atype_string);
3108 /* Default encoding is UTF8 */
3109 ret = print_tabs(session, nesting);
3110 if (ret)
3111 return ret;
3112 ret = lttng_metadata_printf(session,
3113 "string%s",
3114 type->u.string.encoding == lttng_encode_ASCII ?
3115 " { encoding = ASCII; }" : "");
3116 return ret;
3117}
3118
3119static
3120int _lttng_string_field_statedump(struct lttng_session *session,
f513b2bf
MD		 3121 const struct lttng_event_field *field,
3122 size_t nesting)
ceabb767
MD		 3123{
3124 int ret;
3125
3126 WARN_ON_ONCE(field->type.atype != atype_string);
3127 ret = _lttng_string_type_statedump(session, &field->type, nesting);
3128 if (ret)
3129 return ret;
3130 return lttng_field_name_statedump(session, field, nesting);
3131}
3132
3133/*
3134 * Must be called with sessions_mutex held.
3135 */
3136static
3137int _lttng_type_statedump(struct lttng_session *session,
3138 const struct lttng_type *type,
3139 size_t nesting)
c099397a 3140{
c099397a 3141 int ret = 0;
c099397a 3142
ceabb767 3143 switch (type->atype) {
8070f5c0 3144 case atype_integer:
ceabb767 3145 ret = _lttng_integer_type_statedump(session, type, nesting);
8070f5c0 3146 break;
ceabb767
MD		 3147 case atype_enum_nestable:
3148 ret = _lttng_enum_type_statedump(session, type, nesting);
8070f5c0 3149 break;
ceabb767
MD		 3150 case atype_string:
3151 ret = _lttng_string_type_statedump(session, type, nesting);
3152 break;
3153 case atype_struct_nestable:
3154 ret = _lttng_struct_type_statedump(session, type, nesting);
8070f5c0 3155 break;
ceabb767
MD		 3156 case atype_variant_nestable:
3157 ret = _lttng_variant_type_statedump(session, type, nesting);
3158 break;
3159
3160 /* Nested arrays and sequences are not supported yet. */
3161 case atype_array_nestable:
3162 case atype_sequence_nestable:
3163 default:
3164 WARN_ON_ONCE(1);
3165 return -EINVAL;
8070f5c0 3166 }
ceabb767
MD		 3167 return ret;
3168}
8070f5c0 3169
ceabb767
MD		 3170/*
3171 * Must be called with sessions_mutex held.
3172 */
3173static
3174int _lttng_field_statedump(struct lttng_session *session,
3175 const struct lttng_event_field *field,
3176 size_t nesting)
3177{
3178 int ret = 0;
27d2368e 3179
ceabb767
MD		 3180 switch (field->type.atype) {
3181 case atype_integer:
3182 ret = _lttng_integer_field_statedump(session, field, nesting);
3183 break;
3184 case atype_enum_nestable:
3185 ret = _lttng_enum_field_statedump(session, field, nesting);
8070f5c0 3186 break;
8070f5c0 3187 case atype_string:
ceabb767 3188 ret = _lttng_string_field_statedump(session, field, nesting);
8070f5c0 3189 break;
ceabb767
MD		 3190 case atype_struct_nestable:
3191 ret = _lttng_struct_field_statedump(session, field, nesting);
f513b2bf 3192 break;
ceabb767
MD		 3193 case atype_array_nestable:
3194 ret = _lttng_array_field_statedump(session, field, nesting);
f513b2bf 3195 break;
ceabb767
MD		 3196 case atype_sequence_nestable:
3197 ret = _lttng_sequence_field_statedump(session, field, nesting);
f513b2bf 3198 break;
ceabb767
MD		 3199 case atype_variant_nestable:
3200 ret = _lttng_variant_field_statedump(session, field, nesting);
65c85aa6 3201 break;
f513b2bf 3202
8070f5c0
MD		 3203 default:
3204 WARN_ON_ONCE(1);
3205 return -EINVAL;
3206 }
3207 return ret;
3208}
3209
3210static
a90917c3 3211int _lttng_context_metadata_statedump(struct lttng_session *session,
8070f5c0
MD		 3212 struct lttng_ctx *ctx)
3213{
3214 int ret = 0;
3215 int i;
3216
3217 if (!ctx)
3218 return 0;
3219 for (i = 0; i < ctx->nr_fields; i++) {
3220 const struct lttng_ctx_field *field = &ctx->fields[i];
3221
f513b2bf 3222 ret = _lttng_field_statedump(session, &field->event_field, 2);
8070f5c0
MD		 3223 if (ret)
3224 return ret;
3225 }
3226 return ret;
3227}
3228
3229static
a90917c3
MD		 3230int _lttng_fields_metadata_statedump(struct lttng_session *session,
3231 struct lttng_event *event)
8070f5c0
MD		 3232{
3233 const struct lttng_event_desc *desc = event->desc;
3234 int ret = 0;
3235 int i;
3236
3237 for (i = 0; i < desc->nr_fields; i++) {
3238 const struct lttng_event_field *field = &desc->fields[i];
3239
f513b2bf 3240 ret = _lttng_field_statedump(session, field, 2);
8070f5c0
MD		 3241 if (ret)
3242 return ret;
c099397a
MD		 3243 }
3244 return ret;
3245}
3246
d83004aa
JD		 3247/*
3248 * Must be called with sessions_mutex held.
8b97fd42
MD		 3249 * The entire event metadata is printed as a single atomic metadata
3250 * transaction.
d83004aa 3251 */
c099397a 3252static
a90917c3
MD		 3253int _lttng_event_metadata_statedump(struct lttng_session *session,
3254 struct lttng_channel *chan,
3255 struct lttng_event *event)
c099397a
MD		 3256{
3257 int ret = 0;
3258
585e5dcc 3259 if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3260 return 0;
d83004aa 3261 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3262 return 0;
3263
8b97fd42
MD		 3264 lttng_metadata_begin(session);
3265
c099397a
MD		 3266 ret = lttng_metadata_printf(session,
3267 "event {\n"
ae734547 3268 " name = \"%s\";\n"
c099397a 3269 " id = %u;\n"
b9074a1b 3270 " stream_id = %u;\n",
c099397a
MD		 3271 event->desc->name,
3272 event->id,
3273 event->chan->id);
3274 if (ret)
3275 goto end;
3276
b9074a1b
MD		 3277 if (event->ctx) {
3278 ret = lttng_metadata_printf(session,
3279 " context := struct {\n");
3280 if (ret)
3281 goto end;
3282 }
a90917c3 3283 ret = _lttng_context_metadata_statedump(session, event->ctx);
8070f5c0
MD		 3284 if (ret)
3285 goto end;
b9074a1b
MD		 3286 if (event->ctx) {
3287 ret = lttng_metadata_printf(session,
3288 " };\n");
3289 if (ret)
3290 goto end;
3291 }
8070f5c0
MD		 3292
3293 ret = lttng_metadata_printf(session,
8070f5c0
MD		 3294 " fields := struct {\n"
3295 );
3296 if (ret)
3297 goto end;
3298
a90917c3 3299 ret = _lttng_fields_metadata_statedump(session, event);
c099397a
MD		 3300 if (ret)
3301 goto end;
3302
3303 /*
3304 * LTTng space reservation can only reserve multiples of the
3305 * byte size.
3306 */
3307 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3308 " };\n"
3309 "};\n\n");
c099397a
MD		 3310 if (ret)
3311 goto end;
3312
c099397a
MD		 3313 event->metadata_dumped = 1;
3314end:
8b97fd42 3315 lttng_metadata_end(session);
c099397a
MD		 3316 return ret;
3317
3318}
3319
d83004aa
JD		 3320/*
3321 * Must be called with sessions_mutex held.
8b97fd42
MD		 3322 * The entire channel metadata is printed as a single atomic metadata
3323 * transaction.
d83004aa 3324 */
c099397a 3325static
a90917c3
MD		 3326int _lttng_channel_metadata_statedump(struct lttng_session *session,
3327 struct lttng_channel *chan)
c099397a
MD		 3328{
3329 int ret = 0;
3330
585e5dcc 3331 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 3332 return 0;
d83004aa
JD		 3333
3334 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 3335 return 0;
3336
8b97fd42
MD		 3337 lttng_metadata_begin(session);
3338
c099397a
MD		 3339 WARN_ON_ONCE(!chan->header_type);
3340 ret = lttng_metadata_printf(session,
3341 "stream {\n"
3342 " id = %u;\n"
9115fbdc 3343 " event.header := %s;\n"
b9074a1b 3344 " packet.context := struct packet_context;\n",
c099397a
MD		 3345 chan->id,
3346 chan->header_type == 1 ? "struct event_header_compact" :
3347 "struct event_header_large");
3348 if (ret)
3349 goto end;
3350
b9074a1b
MD		 3351 if (chan->ctx) {
3352 ret = lttng_metadata_printf(session,
3353 " event.context := struct {\n");
3354 if (ret)
3355 goto end;
3356 }
a90917c3 3357 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 3358 if (ret)
3359 goto end;
b9074a1b
MD		 3360 if (chan->ctx) {
3361 ret = lttng_metadata_printf(session,
3362 " };\n");
3363 if (ret)
3364 goto end;
3365 }
8070f5c0
MD		 3366
3367 ret = lttng_metadata_printf(session,
b9074a1b 3368 "};\n\n");
8070f5c0 3369
c099397a
MD		 3370 chan->metadata_dumped = 1;
3371end:
8b97fd42 3372 lttng_metadata_end(session);
c099397a
MD		 3373 return ret;
3374}
3375
d83004aa
JD		 3376/*
3377 * Must be called with sessions_mutex held.
3378 */
9115fbdc 3379static
a90917c3 3380int _lttng_stream_packet_context_declare(struct lttng_session *session)
9115fbdc
MD		 3381{
3382 return lttng_metadata_printf(session,
3383 "struct packet_context {\n"
a3ccff4f
MD		 3384 " uint64_clock_monotonic_t timestamp_begin;\n"
3385 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 3386 " uint64_t content_size;\n"
3387 " uint64_t packet_size;\n"
5b3cf4f9 3388 " uint64_t packet_seq_num;\n"
a9afe705 3389 " unsigned long events_discarded;\n"
9115fbdc 3390 " uint32_t cpu_id;\n"
c6dfdf6f 3391 "};\n\n"
9115fbdc
MD		 3392 );
3393}
3394
3395/*
3396 * Compact header:
3397 * id: range: 0 - 30.
3398 * id 31 is reserved to indicate an extended header.
3399 *
3400 * Large header:
3401 * id: range: 0 - 65534.
3402 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 3403 *
3404 * Must be called with sessions_mutex held.
9115fbdc
MD		 3405 */
3406static
a90917c3 3407int _lttng_event_header_declare(struct lttng_session *session)
9115fbdc
MD		 3408{
3409 return lttng_metadata_printf(session,
3410 "struct event_header_compact {\n"
3411 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3412 " variant <id> {\n"
3413 " struct {\n"
a3ccff4f 3414 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3415 " } compact;\n"
3416 " struct {\n"
3417 " uint32_t id;\n"
a3ccff4f 3418 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3419 " } extended;\n"
3420 " } v;\n"
3421 "} align(%u);\n"
3422 "\n"
3423 "struct event_header_large {\n"
3424 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3425 " variant <id> {\n"
3426 " struct {\n"
a3ccff4f 3427 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3428 " } compact;\n"
3429 " struct {\n"
3430 " uint32_t id;\n"
a3ccff4f 3431 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 3432 " } extended;\n"
3433 " } v;\n"
3434 "} align(%u);\n\n",
a90917c3
MD		 3435 lttng_alignof(uint32_t) * CHAR_BIT,
3436 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 3437 );
3438}
3439
a3ccff4f
MD		 3440 /*
3441 * Approximation of NTP time of day to clock monotonic correlation,
3442 * taken at start of trace.
3443 * Yes, this is only an approximation. Yes, we can (and will) do better
3444 * in future versions.
5283350b
MD		 3445 * This function may return a negative offset. It may happen if the
3446 * system sets the REALTIME clock to 0 after boot.
3636085f
MJ		 3447 *
3448 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3449 * y2038 compliant.
a3ccff4f
MD		 3450 */
3451static
8967b2a3 3452int64_t measure_clock_offset(void)
a3ccff4f 3453{
dcb93448 3454 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 3455 uint64_t tcf = trace_clock_freq();
dcb93448 3456 int64_t offset;
a3ccff4f 3457 unsigned long flags;
3636085f
MJ		 3458#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3459 struct timespec64 rts = { 0, 0 };
3460#else
3461 struct timespec rts = { 0, 0 };
3462#endif
a3ccff4f
MD		 3463
3464 /* Disable interrupts to increase correlation precision. */
3465 local_irq_save(flags);
3466 monotonic[0] = trace_clock_read64();
3636085f
MJ		 3467#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3468 ktime_get_real_ts64(&rts);
3469#else
216b6baa 3470 getnstimeofday(&rts);
3636085f 3471#endif
a3ccff4f
MD		 3472 monotonic[1] = trace_clock_read64();
3473 local_irq_restore(flags);
3474
dcb93448 3475 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 3476 realtime = (uint64_t) rts.tv_sec * tcf;
3477 if (tcf == NSEC_PER_SEC) {
3478 realtime += rts.tv_nsec;
3479 } else {
3480 uint64_t n = rts.tv_nsec * tcf;
3481
3482 do_div(n, NSEC_PER_SEC);
3483 realtime += n;
3484 }
dcb93448 3485 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 3486 return offset;
3487}
3488
3eb95be4
JR		 3489static
3490int print_escaped_ctf_string(struct lttng_session *session, const char *string)
3491{
0f3eaad4 3492 int ret = 0;
3eb95be4
JR		 3493 size_t i;
3494 char cur;
3495
3496 i = 0;
3497 cur = string[i];
3498 while (cur != '\0') {
3499 switch (cur) {
3500 case '\n':
3501 ret = lttng_metadata_printf(session, "%s", "\\n");
3502 break;
3503 case '\\':
3504 case '"':
3505 ret = lttng_metadata_printf(session, "%c", '\\');
3506 if (ret)
3507 goto error;
3508 /* We still print the current char */
3509 /* Fallthrough */
3510 default:
3511 ret = lttng_metadata_printf(session, "%c", cur);
3512 break;
3513 }
3514
3515 if (ret)
3516 goto error;
3517
3518 cur = string[++i];
3519 }
3520error:
3521 return ret;
3522}
3523
3524static
1c88f269
JR		 3525int print_metadata_escaped_field(struct lttng_session *session, const char *field,
3526 const char *field_value)
3eb95be4
JR		 3527{
3528 int ret;
3529
1c88f269 3530 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 3531 if (ret)
3532 goto error;
3533
1c88f269 3534 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 3535 if (ret)
3536 goto error;
3537
3538 ret = lttng_metadata_printf(session, "\";\n");
3539
3540error:
3541 return ret;
3542}
3543
c099397a
MD		 3544/*
3545 * Output metadata into this session's metadata buffers.
d83004aa 3546 * Must be called with sessions_mutex held.
c099397a
MD		 3547 */
3548static
a90917c3 3549int _lttng_session_metadata_statedump(struct lttng_session *session)
c099397a 3550{
30bdb6e4 3551 unsigned char *uuid_c = session->uuid.b;
a82c63f1 3552 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 3553 const char *product_uuid;
a90917c3
MD		 3554 struct lttng_channel *chan;
3555 struct lttng_event *event;
c099397a
MD		 3556 int ret = 0;
3557
585e5dcc 3558 if (!LTTNG_READ_ONCE(session->active))
c099397a 3559 return 0;
8b97fd42
MD		 3560
3561 lttng_metadata_begin(session);
3562
c099397a
MD		 3563 if (session->metadata_dumped)
3564 goto skip_session;
c099397a 3565
d793d5e1 3566 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 3567 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3568 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3569 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3570 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3571 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 3572
3573 ret = lttng_metadata_printf(session,
9115fbdc
MD		 3574 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3575 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3576 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3577 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 3578 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 3579 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3580 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 3581 "\n"
3582 "trace {\n"
3583 " major = %u;\n"
3584 " minor = %u;\n"
30bdb6e4 3585 " uuid = \"%s\";\n"
d793d5e1
MD		 3586 " byte_order = %s;\n"
3587 " packet.header := struct {\n"
3588 " uint32_t magic;\n"
1ec3f75a 3589 " uint8_t uuid[16];\n"
d793d5e1 3590 " uint32_t stream_id;\n"
5594698f 3591 " uint64_t stream_instance_id;\n"
0eb25f58 3592 " };\n"
d793d5e1 3593 "};\n\n",
a90917c3
MD		 3594 lttng_alignof(uint8_t) * CHAR_BIT,
3595 lttng_alignof(uint16_t) * CHAR_BIT,
3596 lttng_alignof(uint32_t) * CHAR_BIT,
3597 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 3598 sizeof(unsigned long) * CHAR_BIT,
3599 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 3600 CTF_SPEC_MAJOR,
3601 CTF_SPEC_MINOR,
d793d5e1 3602 uuid_s,
5214fa50 3603#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 3604 "be"
3605#else
3606 "le"
3607#endif
3608 );
3609 if (ret)
3610 goto end;
3611
99dc9597
MD		 3612 ret = lttng_metadata_printf(session,
3613 "env {\n"
a6058143 3614 " hostname = \"%s\";\n"
c6c9e10f 3615 " domain = \"kernel\";\n"
99dc9597 3616 " sysname = \"%s\";\n"
c6c9e10f
MD		 3617 " kernel_release = \"%s\";\n"
3618 " kernel_version = \"%s\";\n"
3619 " tracer_name = \"lttng-modules\";\n"
3620 " tracer_major = %d;\n"
3621 " tracer_minor = %d;\n"
3622 " tracer_patchlevel = %d;\n"
3eb95be4 3623 " trace_buffering_scheme = \"global\";\n",
3d0d43db 3624 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 3625 utsname()->sysname,
3626 utsname()->release,
c6c9e10f
MD		 3627 utsname()->version,
3628 LTTNG_MODULES_MAJOR_VERSION,
3629 LTTNG_MODULES_MINOR_VERSION,
3630 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 3631 );
3632 if (ret)
3633 goto end;
3634
1c88f269
JR		 3635 ret = print_metadata_escaped_field(session, "trace_name", session->name);
3636 if (ret)
3637 goto end;
3638 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
3639 session->creation_time);
3eb95be4
JR		 3640 if (ret)
3641 goto end;
3642
c88f762e
GB		 3643 /* Add the product UUID to the 'env' section */
3644 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3645 if (product_uuid) {
3646 ret = lttng_metadata_printf(session,
3647 " product_uuid = \"%s\";\n",
3648 product_uuid
3649 );
3650 if (ret)
3651 goto end;
3652 }
3653
3654 /* Close the 'env' section */
3eb95be4
JR		 3655 ret = lttng_metadata_printf(session, "};\n\n");
3656 if (ret)
3657 goto end;
3658
a3ccff4f
MD		 3659 ret = lttng_metadata_printf(session,
3660 "clock {\n"
2754583e
MD		 3661 " name = \"%s\";\n",
3662 trace_clock_name()
a82c63f1
MD		 3663 );
3664 if (ret)
3665 goto end;
3666
3667 if (!trace_clock_uuid(clock_uuid_s)) {
3668 ret = lttng_metadata_printf(session,
7c27cb17 3669 " uuid = \"%s\";\n",
a82c63f1
MD		 3670 clock_uuid_s
3671 );
3672 if (ret)
3673 goto end;
3674 }
3675
3676 ret = lttng_metadata_printf(session,
2754583e 3677 " description = \"%s\";\n"
a3ccff4f
MD		 3678 " freq = %llu; /* Frequency, in Hz */\n"
3679 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 3680 " offset = %lld;\n"
a3ccff4f 3681 "};\n\n",
2754583e 3682 trace_clock_description(),
a3ccff4f 3683 (unsigned long long) trace_clock_freq(),
8967b2a3 3684 (long long) measure_clock_offset()
a3ccff4f
MD		 3685 );
3686 if (ret)
3687 goto end;
3688
3689 ret = lttng_metadata_printf(session,
3690 "typealias integer {\n"
3691 " size = 27; align = 1; signed = false;\n"
2754583e 3692 " map = clock.%s.value;\n"
a3ccff4f
MD		 3693 "} := uint27_clock_monotonic_t;\n"
3694 "\n"
3695 "typealias integer {\n"
3696 " size = 32; align = %u; signed = false;\n"
2754583e 3697 " map = clock.%s.value;\n"
a3ccff4f
MD		 3698 "} := uint32_clock_monotonic_t;\n"
3699 "\n"
3700 "typealias integer {\n"
3701 " size = 64; align = %u; signed = false;\n"
2754583e 3702 " map = clock.%s.value;\n"
a3ccff4f 3703 "} := uint64_clock_monotonic_t;\n\n",
2754583e 3704 trace_clock_name(),
a3ccff4f 3705 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 3706 trace_clock_name(),
3707 lttng_alignof(uint64_t) * CHAR_BIT,
3708 trace_clock_name()
a3ccff4f
MD		 3709 );
3710 if (ret)
3711 goto end;
3712
a90917c3 3713 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 3714 if (ret)
3715 goto end;
3716
a90917c3 3717 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 3718 if (ret)
3719 goto end;
3720
c099397a
MD		 3721skip_session:
3722 list_for_each_entry(chan, &session->chan, list) {
a90917c3 3723 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 3724 if (ret)
3725 goto end;
3726 }
3727
3728 list_for_each_entry(event, &session->events, list) {
a90917c3 3729 ret = _lttng_event_metadata_statedump(session, event->chan, event);
c099397a
MD		 3730 if (ret)
3731 goto end;
3732 }
3733 session->metadata_dumped = 1;
3734end:
8b97fd42 3735 lttng_metadata_end(session);
c099397a
MD		 3736 return ret;
3737}
3738
c0e31d2e 3739/**
a90917c3 3740 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 3741 * @transport: transport structure
3742 *
3743 * Registers a transport which can be used as output to extract the data out of
3744 * LTTng. The module calling this registration function must ensure that no
3745 * trap-inducing code will be executed by the transport functions. E.g.
263b6c88 3746 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 3747 * is made visible to the transport function. This registration acts as a
263b6c88 3748 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 3749 * after its registration must it synchronize the TLBs.
3750 */
a90917c3 3751void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 3752{
3753 /*
3754 * Make sure no page fault can be triggered by the module about to be
3755 * registered. We deal with this here so we don't have to call
263b6c88 3756 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 3757 */
263b6c88 3758 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 3759
3760 mutex_lock(&sessions_mutex);
a90917c3 3761 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 3762 mutex_unlock(&sessions_mutex);
3763}
a90917c3 3764EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 3765
3766/**
a90917c3 3767 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 3768 * @transport: transport structure
3769 */
a90917c3 3770void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 3771{
3772 mutex_lock(&sessions_mutex);
3773 list_del(&transport->node);
3774 mutex_unlock(&sessions_mutex);
3775}
a90917c3 3776EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 3777
894ce5dc 3778#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
1e367326
MD		 3779
3780enum cpuhp_state lttng_hp_prepare;
3781enum cpuhp_state lttng_hp_online;
3782
3783static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
3784{
3785 struct lttng_cpuhp_node *lttng_node;
3786
3787 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3788 switch (lttng_node->component) {
3789 case LTTNG_RING_BUFFER_FRONTEND:
3790 return 0;
3791 case LTTNG_RING_BUFFER_BACKEND:
3792 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
3793 case LTTNG_RING_BUFFER_ITER:
3794 return 0;
3795 case LTTNG_CONTEXT_PERF_COUNTERS:
3796 return 0;
3797 default:
3798 return -EINVAL;
3799 }
3800}
3801
3802static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
3803{
3804 struct lttng_cpuhp_node *lttng_node;
3805
3806 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3807 switch (lttng_node->component) {
3808 case LTTNG_RING_BUFFER_FRONTEND:
3809 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
3810 case LTTNG_RING_BUFFER_BACKEND:
3811 return 0;
3812 case LTTNG_RING_BUFFER_ITER:
3813 return 0;
3814 case LTTNG_CONTEXT_PERF_COUNTERS:
3815 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
3816 default:
3817 return -EINVAL;
3818 }
3819}
3820
3821static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
3822{
3823 struct lttng_cpuhp_node *lttng_node;
3824
3825 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3826 switch (lttng_node->component) {
3827 case LTTNG_RING_BUFFER_FRONTEND:
3828 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
3829 case LTTNG_RING_BUFFER_BACKEND:
3830 return 0;
3831 case LTTNG_RING_BUFFER_ITER:
3832 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
3833 case LTTNG_CONTEXT_PERF_COUNTERS:
3834 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
3835 default:
3836 return -EINVAL;
3837 }
3838}
3839
3840static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
3841{
3842 struct lttng_cpuhp_node *lttng_node;
3843
3844 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3845 switch (lttng_node->component) {
3846 case LTTNG_RING_BUFFER_FRONTEND:
3847 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
3848 case LTTNG_RING_BUFFER_BACKEND:
3849 return 0;
3850 case LTTNG_RING_BUFFER_ITER:
3851 return 0;
3852 case LTTNG_CONTEXT_PERF_COUNTERS:
3853 return 0;
3854 default:
3855 return -EINVAL;
3856 }
3857}
3858
3859static int __init lttng_init_cpu_hotplug(void)
3860{
3861 int ret;
3862
3863 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
3864 lttng_hotplug_prepare,
3865 lttng_hotplug_dead);
3866 if (ret < 0) {
3867 return ret;
3868 }
3869 lttng_hp_prepare = ret;
3870 lttng_rb_set_hp_prepare(ret);
3871
3872 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
3873 lttng_hotplug_online,
3874 lttng_hotplug_offline);
3875 if (ret < 0) {
3876 cpuhp_remove_multi_state(lttng_hp_prepare);
3877 lttng_hp_prepare = 0;
3878 return ret;
3879 }
3880 lttng_hp_online = ret;
3881 lttng_rb_set_hp_online(ret);
3882
3883 return 0;
3884}
3885
3886static void __exit lttng_exit_cpu_hotplug(void)
3887{
3888 lttng_rb_set_hp_online(0);
3889 cpuhp_remove_multi_state(lttng_hp_online);
3890 lttng_rb_set_hp_prepare(0);
3891 cpuhp_remove_multi_state(lttng_hp_prepare);
3892}
3893
1ee63d8d 3894#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
1e367326
MD		 3895static int lttng_init_cpu_hotplug(void)
3896{
3897 return 0;
3898}
3899static void lttng_exit_cpu_hotplug(void)
3900{
3901}
1ee63d8d 3902#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
1e367326
MD		 3903
3904
a90917c3 3905static int __init lttng_events_init(void)
4e3c1b9b 3906{
1c25284c
MD		 3907 int ret;
3908
453b2495
JD		 3909 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
3910 if (ret)
3911 return ret;
389d7070 3912 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 3913 if (ret)
3914 return ret;
3915 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 3916 if (ret)
3917 return ret;
3918 ret = lttng_probes_init();
389d7070
MD		 3919 if (ret)
3920 return ret;
07dfc1d0 3921 ret = lttng_context_init();
20591cf7
MD		 3922 if (ret)
3923 return ret;
07dfc1d0
MD		 3924 ret = lttng_tracepoint_init();
3925 if (ret)
3926 goto error_tp;
a90917c3 3927 event_cache = KMEM_CACHE(lttng_event, 0);
20591cf7
MD		 3928 if (!event_cache) {
3929 ret = -ENOMEM;
dffef45d
FD		 3930 goto error_kmem_event;
3931 }
3932 event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0);
3933 if (!event_notifier_cache) {
3934 ret = -ENOMEM;
3935 goto error_kmem_event_notifier;
20591cf7 3936 }
80996790 3937 ret = lttng_abi_init();
02119ee5
MD		 3938 if (ret)
3939 goto error_abi;
0c956676
MD		 3940 ret = lttng_logger_init();
3941 if (ret)
3942 goto error_logger;
1e367326
MD		 3943 ret = lttng_init_cpu_hotplug();
3944 if (ret)
3945 goto error_hotplug;
101215b7 3946 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 3947 __stringify(LTTNG_MODULES_MAJOR_VERSION),
3948 __stringify(LTTNG_MODULES_MINOR_VERSION),
3949 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
3950 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 3951 LTTNG_VERSION_NAME,
3952#ifdef LTTNG_EXTRA_VERSION_GIT
3953 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
3954#else
3955 "",
3956#endif
3957#ifdef LTTNG_EXTRA_VERSION_NAME
3958 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3959#else
3960 "");
3961#endif
4e3c1b9b 3962 return 0;
0c956676 3963
1e367326
MD		 3964error_hotplug:
3965 lttng_logger_exit();
0c956676
MD		 3966error_logger:
3967 lttng_abi_exit();
02119ee5 3968error_abi:
dffef45d
FD		 3969 kmem_cache_destroy(event_notifier_cache);
3970error_kmem_event_notifier:
1c25284c 3971 kmem_cache_destroy(event_cache);
dffef45d 3972error_kmem_event:
20591cf7 3973 lttng_tracepoint_exit();
07dfc1d0
MD		 3974error_tp:
3975 lttng_context_exit();
101215b7 3976 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 3977 __stringify(LTTNG_MODULES_MAJOR_VERSION),
3978 __stringify(LTTNG_MODULES_MINOR_VERSION),
3979 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
3980 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 3981 LTTNG_VERSION_NAME,
3982#ifdef LTTNG_EXTRA_VERSION_GIT
3983 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
3984#else
3985 "",
3986#endif
3987#ifdef LTTNG_EXTRA_VERSION_NAME
3988 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3989#else
3990 "");
3991#endif
1c25284c 3992 return ret;
4e3c1b9b
MD		 3993}
3994
a90917c3 3995module_init(lttng_events_init);
11b5a3c2 3996
a90917c3 3997static void __exit lttng_events_exit(void)
4e3c1b9b 3998{
a90917c3 3999 struct lttng_session *session, *tmpsession;
92e94819 4000
1e367326 4001 lttng_exit_cpu_hotplug();
0c956676 4002 lttng_logger_exit();
80996790 4003 lttng_abi_exit();
92e94819 4004 list_for_each_entry_safe(session, tmpsession, &sessions, list)
a90917c3 4005 lttng_session_destroy(session);
11b5a3c2 4006 kmem_cache_destroy(event_cache);
dffef45d 4007 kmem_cache_destroy(event_notifier_cache);
20591cf7 4008 lttng_tracepoint_exit();
07dfc1d0 4009 lttng_context_exit();
101215b7 4010 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 4011 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4012 __stringify(LTTNG_MODULES_MINOR_VERSION),
4013 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4014 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 4015 LTTNG_VERSION_NAME,
4016#ifdef LTTNG_EXTRA_VERSION_GIT
4017 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4018#else
4019 "",
4020#endif
4021#ifdef LTTNG_EXTRA_VERSION_NAME
4022 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4023#else
4024 "");
4025#endif
4e3c1b9b 4026}
92e94819 4027
a90917c3 4028module_exit(lttng_events_exit);
11b5a3c2 4029
7ca11e77 4030#include <generated/patches.h>
101215b7
MJ		 4031#ifdef LTTNG_EXTRA_VERSION_GIT
4032MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4033#endif
4034#ifdef LTTNG_EXTRA_VERSION_NAME
4035MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4036#endif
92e94819
MD		 4037MODULE_LICENSE("GPL and additional rights");
4038MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 4039MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 4040MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4041 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 4042 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4043 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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