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Fix: timer_expire_entry changed in 4.19.312
[lttng-modules.git] / lttng-events.c
CommitLineData
9f36eaed
MJ		 1/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
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>
3c997079 27#include <linux/jhash.h>
8c6e7f13 28#include <linux/uaccess.h>
a606b6e8 29#include <linux/vmalloc.h>
c88f762e 30#include <linux/dmi.h>
3c997079 31
8b7bb83e 32#include <wrapper/uuid.h>
ea53823c 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8
MD		 34#include <wrapper/random.h>
35#include <wrapper/tracepoint.h>
36#include <wrapper/list.h>
cbc19040 37#include <wrapper/types.h>
241ae9a8
MD		 38#include <lttng-kernel-version.h>
39#include <lttng-events.h>
40#include <lttng-tracer.h>
41#include <lttng-abi-old.h>
5214fa50 42#include <lttng-endian.h>
4993071a 43#include <lttng-string-utils.h>
1d00109f 44#include <wrapper/compiler_attributes.h>
64af2437
MD		 45#include <wrapper/ringbuffer/backend.h>
46#include <wrapper/ringbuffer/frontend.h>
72dc372e 47#include <wrapper/time.h>
4e3c1b9b 48
edee4485
MJ		 49#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0) \
50 || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0))
74b3b9d3
MJ		 51#include <linux/stdarg.h>
52#else
53#include <stdarg.h>
54#endif
55
d83004aa
JD		 56#define METADATA_CACHE_DEFAULT_SIZE 4096
57
4e3c1b9b 58static LIST_HEAD(sessions);
a90917c3 59static LIST_HEAD(lttng_transport_list);
d83004aa
JD		 60/*
61 * Protect the sessions and metadata caches.
62 */
4e3c1b9b
MD		 63static DEFINE_MUTEX(sessions_mutex);
64static struct kmem_cache *event_cache;
65
3c997079
MD		 66static void lttng_session_lazy_sync_enablers(struct lttng_session *session);
67static void lttng_session_sync_enablers(struct lttng_session *session);
68static void lttng_enabler_destroy(struct lttng_enabler *enabler);
69
a90917c3
MD		 70static void _lttng_event_destroy(struct lttng_event *event);
71static void _lttng_channel_destroy(struct lttng_channel *chan);
72static int _lttng_event_unregister(struct lttng_event *event);
c099397a 73static
a90917c3
MD		 74int _lttng_event_metadata_statedump(struct lttng_session *session,
75 struct lttng_channel *chan,
76 struct lttng_event *event);
c099397a 77static
a90917c3 78int _lttng_session_metadata_statedump(struct lttng_session *session);
d83004aa
JD		 79static
80void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
f513b2bf
MD		 81static
82int _lttng_field_statedump(struct lttng_session *session,
83 const struct lttng_event_field *field,
84 size_t nesting);
c099397a 85
c099397a 86void synchronize_trace(void)
abcca994 87{
78f56ae3
MJ		 88#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
89 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
92da05ce
MJ		 90 synchronize_rcu();
91#else
abcca994 92 synchronize_sched();
92da05ce
MJ		 93#endif
94
2d042821 95#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
b8590f40
MD		 96#ifdef CONFIG_PREEMPT_RT_FULL
97 synchronize_rcu();
98#endif
2d042821 99#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 100#ifdef CONFIG_PREEMPT_RT
101 synchronize_rcu();
102#endif
2d042821 103#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
abcca994
MD		 104}
105
3c997079
MD		 106void lttng_lock_sessions(void)
107{
108 mutex_lock(&sessions_mutex);
109}
110
111void lttng_unlock_sessions(void)
112{
113 mutex_unlock(&sessions_mutex);
114}
115
116/*
117 * Called with sessions lock held.
118 */
119int lttng_session_active(void)
120{
121 struct lttng_session *iter;
122
123 list_for_each_entry(iter, &sessions, list) {
124 if (iter->active)
125 return 1;
126 }
127 return 0;
128}
129
a90917c3 130struct lttng_session *lttng_session_create(void)
4e3c1b9b 131{
a90917c3 132 struct lttng_session *session;
d83004aa 133 struct lttng_metadata_cache *metadata_cache;
3c997079 134 int i;
4e3c1b9b
MD		 135
136 mutex_lock(&sessions_mutex);
48f5e0b5 137 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
4e3c1b9b 138 if (!session)
d83004aa 139 goto err;
4e3c1b9b 140 INIT_LIST_HEAD(&session->chan);
f3d01b96 141 INIT_LIST_HEAD(&session->events);
8b7bb83e 142 lttng_guid_gen(&session->uuid);
d83004aa
JD		 143
144 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
145 GFP_KERNEL);
146 if (!metadata_cache)
147 goto err_free_session;
0ca42eb7 148 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
d83004aa
JD		 149 if (!metadata_cache->data)
150 goto err_free_cache;
151 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
152 kref_init(&metadata_cache->refcount);
92d9f5e6 153 mutex_init(&metadata_cache->lock);
d83004aa
JD		 154 session->metadata_cache = metadata_cache;
155 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
a36580d5
MD		 156 memcpy(&metadata_cache->uuid, &session->uuid,
157 sizeof(metadata_cache->uuid));
3c997079
MD		 158 INIT_LIST_HEAD(&session->enablers_head);
159 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
160 INIT_HLIST_HEAD(&session->events_ht.table[i]);
4e3c1b9b 161 list_add(&session->list, &sessions);
d1f652f8
MD		 162 session->pid_tracker.session = session;
163 session->pid_tracker.tracker_type = TRACKER_PID;
164 session->vpid_tracker.session = session;
165 session->vpid_tracker.tracker_type = TRACKER_VPID;
166 session->uid_tracker.session = session;
167 session->uid_tracker.tracker_type = TRACKER_UID;
168 session->vuid_tracker.session = session;
169 session->vuid_tracker.tracker_type = TRACKER_VUID;
170 session->gid_tracker.session = session;
171 session->gid_tracker.tracker_type = TRACKER_GID;
172 session->vgid_tracker.session = session;
173 session->vgid_tracker.tracker_type = TRACKER_VGID;
4e3c1b9b
MD		 174 mutex_unlock(&sessions_mutex);
175 return session;
d83004aa
JD		 176
177err_free_cache:
178 kfree(metadata_cache);
179err_free_session:
48f5e0b5 180 lttng_kvfree(session);
d83004aa
JD		 181err:
182 mutex_unlock(&sessions_mutex);
183 return NULL;
184}
185
186void metadata_cache_destroy(struct kref *kref)
187{
188 struct lttng_metadata_cache *cache =
189 container_of(kref, struct lttng_metadata_cache, refcount);
a606b6e8 190 vfree(cache->data);
d83004aa 191 kfree(cache);
4e3c1b9b
MD		 192}
193
a90917c3 194void lttng_session_destroy(struct lttng_session *session)
4e3c1b9b 195{
a90917c3
MD		 196 struct lttng_channel *chan, *tmpchan;
197 struct lttng_event *event, *tmpevent;
d83004aa 198 struct lttng_metadata_stream *metadata_stream;
3c997079 199 struct lttng_enabler *enabler, *tmpenabler;
dda6a249 200 int ret;
4e3c1b9b
MD		 201
202 mutex_lock(&sessions_mutex);
a8f2d0c7 203 WRITE_ONCE(session->active, 0);
1ec65de1
MD		 204 list_for_each_entry(chan, &session->chan, list) {
205 ret = lttng_syscalls_unregister(chan);
206 WARN_ON(ret);
207 }
dda6a249 208 list_for_each_entry(event, &session->events, list) {
a90917c3 209 ret = _lttng_event_unregister(event);
dda6a249
MD		 210 WARN_ON(ret);
211 }
abcca994 212 synchronize_trace(); /* Wait for in-flight events to complete */
ad594e3a
MD		 213 list_for_each_entry(chan, &session->chan, list) {
214 ret = lttng_syscalls_destroy(chan);
215 WARN_ON(ret);
216 }
3c997079
MD		 217 list_for_each_entry_safe(enabler, tmpenabler,
218 &session->enablers_head, node)
219 lttng_enabler_destroy(enabler);
4e3c1b9b 220 list_for_each_entry_safe(event, tmpevent, &session->events, list)
a90917c3 221 _lttng_event_destroy(event);
d83004aa
JD		 222 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
223 BUG_ON(chan->channel_type == METADATA_CHANNEL);
a90917c3 224 _lttng_channel_destroy(chan);
d83004aa 225 }
5a4afa8a 226 mutex_lock(&session->metadata_cache->lock);
d83004aa
JD		 227 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
228 _lttng_metadata_channel_hangup(metadata_stream);
5a4afa8a 229 mutex_unlock(&session->metadata_cache->lock);
d1f652f8
MD		 230 lttng_id_tracker_destroy(&session->pid_tracker, false);
231 lttng_id_tracker_destroy(&session->vpid_tracker, false);
232 lttng_id_tracker_destroy(&session->uid_tracker, false);
233 lttng_id_tracker_destroy(&session->vuid_tracker, false);
234 lttng_id_tracker_destroy(&session->gid_tracker, false);
235 lttng_id_tracker_destroy(&session->vgid_tracker, false);
d83004aa 236 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
4e3c1b9b
MD		 237 list_del(&session->list);
238 mutex_unlock(&sessions_mutex);
48f5e0b5 239 lttng_kvfree(session);
4e3c1b9b
MD		 240}
241
601252cf
MD		 242int lttng_session_statedump(struct lttng_session *session)
243{
244 int ret;
245
246 mutex_lock(&sessions_mutex);
247 ret = lttng_statedump_start(session);
248 mutex_unlock(&sessions_mutex);
249 return ret;
250}
251
a90917c3 252int lttng_session_enable(struct lttng_session *session)
c0e31d2e
MD		 253{
254 int ret = 0;
a90917c3 255 struct lttng_channel *chan;
c0e31d2e
MD		 256
257 mutex_lock(&sessions_mutex);
258 if (session->active) {
259 ret = -EBUSY;
260 goto end;
261 }
c099397a 262
3c997079
MD		 263 /* Set transient enabler state to "enabled" */
264 session->tstate = 1;
265
4ef81e4a
MD		 266 /* We need to sync enablers with session before activation. */
267 lttng_session_sync_enablers(session);
268
c099397a
MD		 269 /*
270 * Snapshot the number of events per channel to know the type of header
271 * we need to use.
272 */
273 list_for_each_entry(chan, &session->chan, list) {
274 if (chan->header_type)
275 continue; /* don't change it if session stop/restart */
276 if (chan->free_event_id < 31)
277 chan->header_type = 1; /* compact */
278 else
279 chan->header_type = 2; /* large */
280 }
281
64af2437 282 /* Clear each stream's quiescent state. */
09b93db9
MD		 283 list_for_each_entry(chan, &session->chan, list) {
284 if (chan->channel_type != METADATA_CHANNEL)
285 lib_ring_buffer_clear_quiescent_channel(chan->chan);
286 }
64af2437 287
a8f2d0c7
MJ		 288 WRITE_ONCE(session->active, 1);
289 WRITE_ONCE(session->been_active, 1);
a90917c3 290 ret = _lttng_session_metadata_statedump(session);
c337ddc2 291 if (ret) {
a8f2d0c7 292 WRITE_ONCE(session->active, 0);
c337ddc2
MD		 293 goto end;
294 }
295 ret = lttng_statedump_start(session);
360f38ea 296 if (ret)
a8f2d0c7 297 WRITE_ONCE(session->active, 0);
c0e31d2e
MD		 298end:
299 mutex_unlock(&sessions_mutex);
11b5a3c2 300 return ret;
c0e31d2e
MD		 301}
302
a90917c3 303int lttng_session_disable(struct lttng_session *session)
c0e31d2e
MD		 304{
305 int ret = 0;
64af2437 306 struct lttng_channel *chan;
c0e31d2e
MD		 307
308 mutex_lock(&sessions_mutex);
309 if (!session->active) {
310 ret = -EBUSY;
311 goto end;
312 }
a8f2d0c7 313 WRITE_ONCE(session->active, 0);
3c997079
MD		 314
315 /* Set transient enabler state to "disabled" */
316 session->tstate = 0;
317 lttng_session_sync_enablers(session);
64af2437
MD		 318
319 /* Set each stream's quiescent state. */
09b93db9
MD		 320 list_for_each_entry(chan, &session->chan, list) {
321 if (chan->channel_type != METADATA_CHANNEL)
322 lib_ring_buffer_set_quiescent_channel(chan->chan);
323 }
c0e31d2e
MD		 324end:
325 mutex_unlock(&sessions_mutex);
11b5a3c2 326 return ret;
c0e31d2e
MD		 327}
328
9616f0bf
JD		 329int lttng_session_metadata_regenerate(struct lttng_session *session)
330{
331 int ret = 0;
332 struct lttng_channel *chan;
333 struct lttng_event *event;
334 struct lttng_metadata_cache *cache = session->metadata_cache;
335 struct lttng_metadata_stream *stream;
336
337 mutex_lock(&sessions_mutex);
338 if (!session->active) {
339 ret = -EBUSY;
340 goto end;
341 }
342
343 mutex_lock(&cache->lock);
344 memset(cache->data, 0, cache->cache_alloc);
345 cache->metadata_written = 0;
346 cache->version++;
347 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
348 stream->metadata_out = 0;
349 stream->metadata_in = 0;
350 }
351 mutex_unlock(&cache->lock);
352
353 session->metadata_dumped = 0;
354 list_for_each_entry(chan, &session->chan, list) {
355 chan->metadata_dumped = 0;
356 }
357
358 list_for_each_entry(event, &session->events, list) {
359 event->metadata_dumped = 0;
360 }
361
362 ret = _lttng_session_metadata_statedump(session);
363
364end:
365 mutex_unlock(&sessions_mutex);
366 return ret;
367}
368
a90917c3 369int lttng_channel_enable(struct lttng_channel *channel)
e64957da 370{
3c997079 371 int ret = 0;
e64957da 372
3c997079
MD		 373 mutex_lock(&sessions_mutex);
374 if (channel->channel_type == METADATA_CHANNEL) {
375 ret = -EPERM;
376 goto end;
377 }
378 if (channel->enabled) {
379 ret = -EEXIST;
380 goto end;
381 }
382 /* Set transient enabler state to "enabled" */
383 channel->tstate = 1;
384 lttng_session_sync_enablers(channel->session);
385 /* Set atomically the state to "enabled" */
a8f2d0c7 386 WRITE_ONCE(channel->enabled, 1);
3c997079
MD		 387end:
388 mutex_unlock(&sessions_mutex);
389 return ret;
e64957da
MD		 390}
391
a90917c3 392int lttng_channel_disable(struct lttng_channel *channel)
e64957da 393{
3c997079 394 int ret = 0;
e64957da 395
3c997079
MD		 396 mutex_lock(&sessions_mutex);
397 if (channel->channel_type == METADATA_CHANNEL) {
398 ret = -EPERM;
399 goto end;
400 }
401 if (!channel->enabled) {
402 ret = -EEXIST;
403 goto end;
404 }
405 /* Set atomically the state to "disabled" */
a8f2d0c7 406 WRITE_ONCE(channel->enabled, 0);
3c997079
MD		 407 /* Set transient enabler state to "enabled" */
408 channel->tstate = 0;
409 lttng_session_sync_enablers(channel->session);
410end:
411 mutex_unlock(&sessions_mutex);
412 return ret;
e64957da
MD		 413}
414
a90917c3 415int lttng_event_enable(struct lttng_event *event)
e64957da 416{
3c997079 417 int ret = 0;
e64957da 418
3c997079
MD		 419 mutex_lock(&sessions_mutex);
420 if (event->chan->channel_type == METADATA_CHANNEL) {
421 ret = -EPERM;
422 goto end;
423 }
424 if (event->enabled) {
425 ret = -EEXIST;
426 goto end;
427 }
a0493bef
MD		 428 switch (event->instrumentation) {
429 case LTTNG_KERNEL_TRACEPOINT:
430 case LTTNG_KERNEL_SYSCALL:
431 ret = -EINVAL;
432 break;
433 case LTTNG_KERNEL_KPROBE:
149b9a9d 434 case LTTNG_KERNEL_UPROBE:
a0493bef 435 case LTTNG_KERNEL_NOOP:
a8f2d0c7 436 WRITE_ONCE(event->enabled, 1);
a0493bef
MD		 437 break;
438 case LTTNG_KERNEL_KRETPROBE:
439 ret = lttng_kretprobes_event_enable_state(event, 1);
440 break;
1d00109f
MJ		 441 case LTTNG_KERNEL_FUNCTION:
442 lttng_fallthrough;
a0493bef
MD		 443 default:
444 WARN_ON_ONCE(1);
445 ret = -EINVAL;
446 }
3c997079
MD		 447end:
448 mutex_unlock(&sessions_mutex);
449 return ret;
e64957da
MD		 450}
451
a90917c3 452int lttng_event_disable(struct lttng_event *event)
e64957da 453{
3c997079 454 int ret = 0;
e64957da 455
3c997079
MD		 456 mutex_lock(&sessions_mutex);
457 if (event->chan->channel_type == METADATA_CHANNEL) {
458 ret = -EPERM;
459 goto end;
460 }
461 if (!event->enabled) {
462 ret = -EEXIST;
463 goto end;
464 }
a0493bef
MD		 465 switch (event->instrumentation) {
466 case LTTNG_KERNEL_TRACEPOINT:
467 case LTTNG_KERNEL_SYSCALL:
468 ret = -EINVAL;
469 break;
470 case LTTNG_KERNEL_KPROBE:
149b9a9d 471 case LTTNG_KERNEL_UPROBE:
a0493bef 472 case LTTNG_KERNEL_NOOP:
a8f2d0c7 473 WRITE_ONCE(event->enabled, 0);
a0493bef
MD		 474 break;
475 case LTTNG_KERNEL_KRETPROBE:
476 ret = lttng_kretprobes_event_enable_state(event, 0);
477 break;
1d00109f
MJ		 478 case LTTNG_KERNEL_FUNCTION:
479 lttng_fallthrough;
a0493bef
MD		 480 default:
481 WARN_ON_ONCE(1);
482 ret = -EINVAL;
483 }
3c997079
MD		 484end:
485 mutex_unlock(&sessions_mutex);
486 return ret;
e64957da
MD		 487}
488
a90917c3 489static struct lttng_transport *lttng_transport_find(const char *name)
f3d01b96 490{
a90917c3 491 struct lttng_transport *transport;
f3d01b96 492
a90917c3 493 list_for_each_entry(transport, &lttng_transport_list, node) {
f3d01b96
MD		 494 if (!strcmp(transport->name, name))
495 return transport;
496 }
497 return NULL;
498}
499
a90917c3 500struct lttng_channel *lttng_channel_create(struct lttng_session *session,
5dbbdb43
MD		 501 const char *transport_name,
502 void *buf_addr,
4e3c1b9b
MD		 503 size_t subbuf_size, size_t num_subbuf,
504 unsigned int switch_timer_interval,
d83004aa
JD		 505 unsigned int read_timer_interval,
506 enum channel_type channel_type)
4e3c1b9b 507{
a90917c3
MD		 508 struct lttng_channel *chan;
509 struct lttng_transport *transport = NULL;
4e3c1b9b
MD		 510
511 mutex_lock(&sessions_mutex);
d83004aa 512 if (session->been_active && channel_type != METADATA_CHANNEL)
e5382b6d 513 goto active; /* Refuse to add channel to active session */
a90917c3 514 transport = lttng_transport_find(transport_name);
f3d01b96
MD		 515 if (!transport) {
516 printk(KERN_WARNING "LTTng transport %s not found\n",
517 transport_name);
c0e31d2e 518 goto notransport;
f3d01b96 519 }
a33c9927
MD		 520 if (!try_module_get(transport->owner)) {
521 printk(KERN_WARNING "LTT : Can't lock transport module.\n");
522 goto notransport;
523 }
a90917c3 524 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
4e3c1b9b 525 if (!chan)
c0e31d2e 526 goto nomem;
4e3c1b9b 527 chan->session = session;
05d32c64 528 chan->id = session->free_chan_id++;
3b731ab1 529 chan->ops = &transport->ops;
125b4df4
MD		 530 /*
531 * Note: the channel creation op already writes into the packet
532 * headers. Therefore the "chan" information used as input
533 * should be already accessible.
534 */
5f5ddf01
MD		 535 chan->chan = transport->ops.channel_create(transport_name,
536 chan, buf_addr, subbuf_size, num_subbuf,
537 switch_timer_interval, read_timer_interval);
f3d01b96
MD		 538 if (!chan->chan)
539 goto create_error;
3c997079 540 chan->tstate = 1;
e64957da 541 chan->enabled = 1;
a33c9927 542 chan->transport = transport;
d83004aa 543 chan->channel_type = channel_type;
4e3c1b9b
MD		 544 list_add(&chan->list, &session->chan);
545 mutex_unlock(&sessions_mutex);
546 return chan;
547
f3d01b96
MD		 548create_error:
549 kfree(chan);
c0e31d2e 550nomem:
a33c9927
MD		 551 if (transport)
552 module_put(transport->owner);
c0e31d2e 553notransport:
e5382b6d 554active:
4e3c1b9b
MD		 555 mutex_unlock(&sessions_mutex);
556 return NULL;
557}
558
559/*
d83004aa
JD		 560 * Only used internally at session destruction for per-cpu channels, and
561 * when metadata channel is released.
562 * Needs to be called with sessions mutex held.
4e3c1b9b 563 */
aa7c23a9 564static
a90917c3 565void _lttng_channel_destroy(struct lttng_channel *chan)
4e3c1b9b 566{
11b5a3c2 567 chan->ops->channel_destroy(chan->chan);
a33c9927 568 module_put(chan->transport->owner);
4e3c1b9b 569 list_del(&chan->list);
8070f5c0 570 lttng_destroy_context(chan->ctx);
4e3c1b9b
MD		 571 kfree(chan);
572}
573
d83004aa
JD		 574void lttng_metadata_channel_destroy(struct lttng_channel *chan)
575{
576 BUG_ON(chan->channel_type != METADATA_CHANNEL);
577
578 /* Protect the metadata cache with the sessions_mutex. */
579 mutex_lock(&sessions_mutex);
580 _lttng_channel_destroy(chan);
581 mutex_unlock(&sessions_mutex);
582}
583EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
584
585static
586void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
587{
588 stream->finalized = 1;
589 wake_up_interruptible(&stream->read_wait);
590}
591
e5382b6d
MD		 592/*
593 * Supports event creation while tracing session is active.
3c997079 594 * Needs to be called with sessions mutex held.
e5382b6d 595 */
3c997079
MD		 596struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
597 struct lttng_kernel_event *event_param,
598 void *filter,
599 const struct lttng_event_desc *event_desc,
600 enum lttng_kernel_instrumentation itype)
4e3c1b9b 601{
3c997079 602 struct lttng_session *session = chan->session;
a90917c3 603 struct lttng_event *event;
3c997079
MD		 604 const char *event_name;
605 struct hlist_head *head;
606 size_t name_len;
607 uint32_t hash;
3d084699 608 int ret;
4e3c1b9b 609
abc0446a 610 if (chan->free_event_id == -1U) {
4cf0bf51 611 ret = -EMFILE;
e5382b6d 612 goto full;
abc0446a 613 }
3c997079
MD		 614
615 switch (itype) {
616 case LTTNG_KERNEL_TRACEPOINT:
617 event_name = event_desc->name;
618 break;
619 case LTTNG_KERNEL_KPROBE:
149b9a9d 620 case LTTNG_KERNEL_UPROBE:
3c997079 621 case LTTNG_KERNEL_KRETPROBE:
3c997079 622 case LTTNG_KERNEL_NOOP:
33a39a3c 623 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 624 event_name = event_param->name;
625 break;
1d00109f
MJ		 626 case LTTNG_KERNEL_FUNCTION:
627 lttng_fallthrough;
3c997079
MD		 628 default:
629 WARN_ON_ONCE(1);
630 ret = -EINVAL;
631 goto type_error;
632 }
633 name_len = strlen(event_name);
634 hash = jhash(event_name, name_len, 0);
635 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
d216ecae 636 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079
MD		 637 WARN_ON_ONCE(!event->desc);
638 if (!strncmp(event->desc->name, event_name,
639 LTTNG_KERNEL_SYM_NAME_LEN - 1)
640 && chan == event->chan) {
641 ret = -EEXIST;
642 goto exist;
abc0446a
MD		 643 }
644 }
3c997079 645
11b5a3c2 646 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 647 if (!event) {
4cf0bf51 648 ret = -ENOMEM;
4e3c1b9b 649 goto cache_error;
abc0446a 650 }
4e3c1b9b
MD		 651 event->chan = chan;
652 event->filter = filter;
e5382b6d 653 event->id = chan->free_event_id++;
3c997079
MD		 654 event->instrumentation = itype;
655 event->evtype = LTTNG_TYPE_EVENT;
07dfc1d0 656 INIT_LIST_HEAD(&event->bytecode_runtime_head);
3c997079
MD		 657 INIT_LIST_HEAD(&event->enablers_ref_head);
658
659 switch (itype) {
ab2277d6 660 case LTTNG_KERNEL_TRACEPOINT:
3c997079
MD		 661 /* Event will be enabled by enabler sync. */
662 event->enabled = 0;
663 event->registered = 0;
664 event->desc = lttng_event_get(event_name);
abc0446a 665 if (!event->desc) {
4cf0bf51 666 ret = -ENOENT;
d3dbe23c 667 goto register_error;
abc0446a 668 }
3c997079
MD		 669 /* Populate lttng_event structure before event registration. */
670 smp_wmb();
baf20995 671 break;
ab2277d6 672 case LTTNG_KERNEL_KPROBE:
a0493bef
MD		 673 /*
674 * Needs to be explicitly enabled after creation, since
675 * we may want to apply filters.
676 */
677 event->enabled = 0;
3c997079
MD		 678 event->registered = 1;
679 /*
680 * Populate lttng_event structure before event
681 * registration.
682 */
683 smp_wmb();
684 ret = lttng_kprobes_register(event_name,
f17701fb
MD		 685 event_param->u.kprobe.symbol_name,
686 event_param->u.kprobe.offset,
687 event_param->u.kprobe.addr,
688 event);
abc0446a 689 if (ret) {
4cf0bf51 690 ret = -EINVAL;
d6d808f3 691 goto register_error;
abc0446a 692 }
edeb3137
MD		 693 ret = try_module_get(event->desc->owner);
694 WARN_ON_ONCE(!ret);
d6d808f3 695 break;
7371f44c
MD		 696 case LTTNG_KERNEL_KRETPROBE:
697 {
a90917c3 698 struct lttng_event *event_return;
7371f44c
MD		 699
700 /* kretprobe defines 2 events */
a0493bef
MD		 701 /*
702 * Needs to be explicitly enabled after creation, since
703 * we may want to apply filters.
704 */
705 event->enabled = 0;
3c997079 706 event->registered = 1;
7371f44c
MD		 707 event_return =
708 kmem_cache_zalloc(event_cache, GFP_KERNEL);
abc0446a 709 if (!event_return) {
4cf0bf51 710 ret = -ENOMEM;
7371f44c 711 goto register_error;
abc0446a 712 }
7371f44c
MD		 713 event_return->chan = chan;
714 event_return->filter = filter;
715 event_return->id = chan->free_event_id++;
a0493bef 716 event_return->enabled = 0;
3c997079
MD		 717 event_return->registered = 1;
718 event_return->instrumentation = itype;
92cc3e7f
FD		 719 INIT_LIST_HEAD(&event_return->bytecode_runtime_head);
720 INIT_LIST_HEAD(&event_return->enablers_ref_head);
7371f44c 721 /*
a90917c3 722 * Populate lttng_event structure before kretprobe registration.
7371f44c
MD		 723 */
724 smp_wmb();
3c997079 725 ret = lttng_kretprobes_register(event_name,
7371f44c
MD		 726 event_param->u.kretprobe.symbol_name,
727 event_param->u.kretprobe.offset,
728 event_param->u.kretprobe.addr,
729 event, event_return);
730 if (ret) {
731 kmem_cache_free(event_cache, event_return);
4cf0bf51 732 ret = -EINVAL;
7371f44c
MD		 733 goto register_error;
734 }
735 /* Take 2 refs on the module: one per event. */
736 ret = try_module_get(event->desc->owner);
737 WARN_ON_ONCE(!ret);
738 ret = try_module_get(event->desc->owner);
739 WARN_ON_ONCE(!ret);
a90917c3 740 ret = _lttng_event_metadata_statedump(chan->session, chan,
7371f44c 741 event_return);
abc0446a 742 WARN_ON_ONCE(ret > 0);
7371f44c
MD		 743 if (ret) {
744 kmem_cache_free(event_cache, event_return);
745 module_put(event->desc->owner);
746 module_put(event->desc->owner);
747 goto statedump_error;
748 }
749 list_add(&event_return->list, &chan->session->events);
750 break;
751 }
1ec65de1 752 case LTTNG_KERNEL_NOOP:
33a39a3c 753 case LTTNG_KERNEL_SYSCALL:
a0493bef
MD		 754 /*
755 * Needs to be explicitly enabled after creation, since
756 * we may want to apply filters.
757 */
758 event->enabled = 0;
3c997079
MD		 759 event->registered = 0;
760 event->desc = event_desc;
ad594e3a
MD		 761 switch (event_param->u.syscall.entryexit) {
762 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
763 ret = -EINVAL;
764 goto register_error;
765 case LTTNG_KERNEL_SYSCALL_ENTRY:
766 event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
767 break;
768 case LTTNG_KERNEL_SYSCALL_EXIT:
769 event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
770 break;
771 }
772 switch (event_param->u.syscall.abi) {
773 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
774 ret = -EINVAL;
775 goto register_error;
776 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
777 event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
778 break;
779 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
780 event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
781 break;
782 }
abc0446a 783 if (!event->desc) {
4cf0bf51 784 ret = -EINVAL;
259b6cb3 785 goto register_error;
abc0446a 786 }
1ec65de1 787 break;
149b9a9d 788 case LTTNG_KERNEL_UPROBE:
a344f64b
FD		 789 /*
790 * Needs to be explicitly enabled after creation, since
791 * we may want to apply filters.
792 */
793 event->enabled = 0;
794 event->registered = 1;
3aed4dca 795
a344f64b
FD		 796 /*
797 * Populate lttng_event structure before event
798 * registration.
799 */
800 smp_wmb();
149b9a9d
YB		 801
802 ret = lttng_uprobes_register(event_param->name,
56377c91 803 event_param->u.uprobe.fd,
149b9a9d
YB		 804 event);
805 if (ret)
806 goto register_error;
807 ret = try_module_get(event->desc->owner);
808 WARN_ON_ONCE(!ret);
809 break;
1d00109f
MJ		 810 case LTTNG_KERNEL_FUNCTION:
811 lttng_fallthrough;
baf20995
MD		 812 default:
813 WARN_ON_ONCE(1);
4cf0bf51 814 ret = -EINVAL;
df07930b 815 goto register_error;
baf20995 816 }
a90917c3 817 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
abc0446a
MD		 818 WARN_ON_ONCE(ret > 0);
819 if (ret) {
c099397a 820 goto statedump_error;
abc0446a 821 }
3c997079 822 hlist_add_head(&event->hlist, head);
dda6a249 823 list_add(&event->list, &chan->session->events);
4e3c1b9b
MD		 824 return event;
825
c099397a 826statedump_error:
259b6cb3 827 /* If a statedump error occurs, events will not be readable. */
11b5a3c2 828register_error:
11b5a3c2 829 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 830cache_error:
831exist:
3c997079 832type_error:
e5382b6d 833full:
4cf0bf51 834 return ERR_PTR(ret);
4e3c1b9b
MD		 835}
836
3c997079
MD		 837struct lttng_event *lttng_event_create(struct lttng_channel *chan,
838 struct lttng_kernel_event *event_param,
839 void *filter,
840 const struct lttng_event_desc *event_desc,
841 enum lttng_kernel_instrumentation itype)
842{
843 struct lttng_event *event;
844
845 mutex_lock(&sessions_mutex);
846 event = _lttng_event_create(chan, event_param, filter, event_desc,
847 itype);
848 mutex_unlock(&sessions_mutex);
849 return event;
850}
851
852/* Only used for tracepoints for now. */
853static
854void register_event(struct lttng_event *event)
855{
856 const struct lttng_event_desc *desc;
f127e61e 857 int ret = -EINVAL;
3c997079 858
3c997079
MD		 859 if (event->registered)
860 return;
4ecb5ad5 861
3c997079 862 desc = event->desc;
4ecb5ad5
MD		 863 switch (event->instrumentation) {
864 case LTTNG_KERNEL_TRACEPOINT:
865 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
866 desc->probe_callback,
867 event);
868 break;
869 case LTTNG_KERNEL_SYSCALL:
ad594e3a 870 ret = lttng_syscall_filter_enable(event->chan, event);
4ecb5ad5
MD		 871 break;
872 case LTTNG_KERNEL_KPROBE:
a344f64b 873 case LTTNG_KERNEL_UPROBE:
4ecb5ad5 874 case LTTNG_KERNEL_KRETPROBE:
4ecb5ad5
MD		 875 case LTTNG_KERNEL_NOOP:
876 ret = 0;
877 break;
1d00109f
MJ		 878 case LTTNG_KERNEL_FUNCTION:
879 lttng_fallthrough;
4ecb5ad5
MD		 880 default:
881 WARN_ON_ONCE(1);
882 }
3c997079
MD		 883 if (!ret)
884 event->registered = 1;
885}
886
4e3c1b9b
MD		 887/*
888 * Only used internally at session destruction.
889 */
a90917c3 890int _lttng_event_unregister(struct lttng_event *event)
4e3c1b9b 891{
4ecb5ad5 892 const struct lttng_event_desc *desc;
11b5a3c2
MD		 893 int ret = -EINVAL;
894
3c997079
MD		 895 if (!event->registered)
896 return 0;
897
4ecb5ad5 898 desc = event->desc;
38d024ae 899 switch (event->instrumentation) {
ab2277d6 900 case LTTNG_KERNEL_TRACEPOINT:
20591cf7 901 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
85a9ca7f 902 event->desc->probe_callback,
11b5a3c2 903 event);
baf20995 904 break;
ab2277d6 905 case LTTNG_KERNEL_KPROBE:
f17701fb 906 lttng_kprobes_unregister(event);
d6d808f3
MD		 907 ret = 0;
908 break;
7371f44c
MD		 909 case LTTNG_KERNEL_KRETPROBE:
910 lttng_kretprobes_unregister(event);
911 ret = 0;
912 break;
33a39a3c 913 case LTTNG_KERNEL_SYSCALL:
ad594e3a 914 ret = lttng_syscall_filter_disable(event->chan, event);
4ecb5ad5
MD		 915 break;
916 case LTTNG_KERNEL_NOOP:
259b6cb3
MD		 917 ret = 0;
918 break;
149b9a9d
YB		 919 case LTTNG_KERNEL_UPROBE:
920 lttng_uprobes_unregister(event);
921 ret = 0;
922 break;
1d00109f
MJ		 923 case LTTNG_KERNEL_FUNCTION:
924 lttng_fallthrough;
baf20995
MD		 925 default:
926 WARN_ON_ONCE(1);
927 }
3c997079
MD		 928 if (!ret)
929 event->registered = 0;
dda6a249
MD		 930 return ret;
931}
932
933/*
934 * Only used internally at session destruction.
935 */
be066e6c 936static
a90917c3 937void _lttng_event_destroy(struct lttng_event *event)
dda6a249 938{
b3fdf78b
MD		 939 struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
940
edeb3137
MD		 941 switch (event->instrumentation) {
942 case LTTNG_KERNEL_TRACEPOINT:
a90917c3 943 lttng_event_put(event->desc);
edeb3137
MD		 944 break;
945 case LTTNG_KERNEL_KPROBE:
946 module_put(event->desc->owner);
947 lttng_kprobes_destroy_private(event);
948 break;
7371f44c
MD		 949 case LTTNG_KERNEL_KRETPROBE:
950 module_put(event->desc->owner);
951 lttng_kretprobes_destroy_private(event);
952 break;
259b6cb3 953 case LTTNG_KERNEL_NOOP:
33a39a3c 954 case LTTNG_KERNEL_SYSCALL:
259b6cb3 955 break;
149b9a9d
YB		 956 case LTTNG_KERNEL_UPROBE:
957 module_put(event->desc->owner);
958 lttng_uprobes_destroy_private(event);
959 break;
1d00109f
MJ		 960 case LTTNG_KERNEL_FUNCTION:
961 lttng_fallthrough;
edeb3137
MD		 962 default:
963 WARN_ON_ONCE(1);
964 }
dda6a249 965 list_del(&event->list);
8070f5c0 966 lttng_destroy_context(event->ctx);
b3fdf78b
MD		 967 lttng_free_event_filter_runtime(event);
968 /* Free event enabler refs */
969 list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
970 &event->enablers_ref_head, node)
971 kfree(enabler_ref);
11b5a3c2 972 kmem_cache_free(event_cache, event);
4e3c1b9b
MD		 973}
974
d1f652f8
MD		 975struct lttng_id_tracker *get_tracker(struct lttng_session *session,
976 enum tracker_type tracker_type)
e0130fab 977{
d1f652f8
MD		 978 switch (tracker_type) {
979 case TRACKER_PID:
980 return &session->pid_tracker;
981 case TRACKER_VPID:
982 return &session->vpid_tracker;
983 case TRACKER_UID:
984 return &session->uid_tracker;
985 case TRACKER_VUID:
986 return &session->vuid_tracker;
987 case TRACKER_GID:
988 return &session->gid_tracker;
989 case TRACKER_VGID:
990 return &session->vgid_tracker;
991 default:
992 WARN_ON_ONCE(1);
993 return NULL;
994 }
995}
996
997int lttng_session_track_id(struct lttng_session *session,
998 enum tracker_type tracker_type, int id)
999{
1000 struct lttng_id_tracker *tracker;
e0130fab
MD		 1001 int ret;
1002
d1f652f8
MD		 1003 tracker = get_tracker(session, tracker_type);
1004 if (!tracker)
1005 return -EINVAL;
1006 if (id < -1)
e0130fab
MD		 1007 return -EINVAL;
1008 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1009 if (id == -1) {
1010 /* track all ids: destroy tracker. */
1011 lttng_id_tracker_destroy(tracker, true);
e0130fab
MD		 1012 ret = 0;
1013 } else {
d1f652f8 1014 ret = lttng_id_tracker_add(tracker, id);
e0130fab 1015 }
e0130fab
MD		 1016 mutex_unlock(&sessions_mutex);
1017 return ret;
1018}
1019
d1f652f8
MD		 1020int lttng_session_untrack_id(struct lttng_session *session,
1021 enum tracker_type tracker_type, int id)
e0130fab 1022{
d1f652f8 1023 struct lttng_id_tracker *tracker;
e0130fab
MD		 1024 int ret;
1025
d1f652f8
MD		 1026 tracker = get_tracker(session, tracker_type);
1027 if (!tracker)
1028 return -EINVAL;
1029 if (id < -1)
e0130fab
MD		 1030 return -EINVAL;
1031 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1032 if (id == -1) {
1033 /* untrack all ids: replace by empty tracker. */
1034 ret = lttng_id_tracker_empty_set(tracker);
e0130fab 1035 } else {
d1f652f8 1036 ret = lttng_id_tracker_del(tracker, id);
e0130fab 1037 }
e0130fab
MD		 1038 mutex_unlock(&sessions_mutex);
1039 return ret;
1040}
1041
7e6f9ef6 1042static
d1f652f8 1043void *id_list_start(struct seq_file *m, loff_t *pos)
7e6f9ef6 1044{
d1f652f8
MD		 1045 struct lttng_id_tracker *id_tracker = m->private;
1046 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1047 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1048 int iter = 0, i;
1049
1050 mutex_lock(&sessions_mutex);
d1f652f8
MD		 1051 if (id_tracker_p) {
1052 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1053 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1054
f934e302 1055 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1056 if (iter++ >= *pos)
1057 return e;
1058 }
1059 }
1060 } else {
d1f652f8 1061 /* ID tracker disabled. */
7e6f9ef6 1062 if (iter >= *pos && iter == 0) {
d1f652f8 1063 return id_tracker_p; /* empty tracker */
7e6f9ef6
MD		 1064 }
1065 iter++;
1066 }
1067 /* End of list */
1068 return NULL;
1069}
1070
1071/* Called with sessions_mutex held. */
1072static
d1f652f8 1073void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
7e6f9ef6 1074{
d1f652f8
MD		 1075 struct lttng_id_tracker *id_tracker = m->private;
1076 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1077 struct lttng_id_hash_node *e;
7e6f9ef6
MD		 1078 int iter = 0, i;
1079
1080 (*ppos)++;
d1f652f8
MD		 1081 if (id_tracker_p) {
1082 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1083 struct hlist_head *head = &id_tracker_p->id_hash[i];
7e6f9ef6 1084
f934e302 1085 lttng_hlist_for_each_entry(e, head, hlist) {
7e6f9ef6
MD		 1086 if (iter++ >= *ppos)
1087 return e;
1088 }
1089 }
1090 } else {
d1f652f8 1091 /* ID tracker disabled. */
7e6f9ef6 1092 if (iter >= *ppos && iter == 0)
d1f652f8 1093 return p; /* empty tracker */
7e6f9ef6
MD		 1094 iter++;
1095 }
1096
1097 /* End of list */
1098 return NULL;
1099}
1100
1101static
d1f652f8 1102void id_list_stop(struct seq_file *m, void *p)
7e6f9ef6
MD		 1103{
1104 mutex_unlock(&sessions_mutex);
1105}
1106
1107static
d1f652f8 1108int id_list_show(struct seq_file *m, void *p)
7e6f9ef6 1109{
d1f652f8
MD		 1110 struct lttng_id_tracker *id_tracker = m->private;
1111 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1112 int id;
7e6f9ef6 1113
d1f652f8 1114 if (p == id_tracker_p) {
7e6f9ef6 1115 /* Tracker disabled. */
d1f652f8 1116 id = -1;
7e6f9ef6 1117 } else {
d1f652f8 1118 const struct lttng_id_hash_node *e = p;
7e6f9ef6 1119
d1f652f8
MD		 1120 id = lttng_id_tracker_get_node_id(e);
1121 }
1122 switch (id_tracker->tracker_type) {
1123 case TRACKER_PID:
1124 seq_printf(m, "process { pid = %d; };\n", id);
1125 break;
1126 case TRACKER_VPID:
1127 seq_printf(m, "process { vpid = %d; };\n", id);
1128 break;
1129 case TRACKER_UID:
1130 seq_printf(m, "user { uid = %d; };\n", id);
1131 break;
1132 case TRACKER_VUID:
1133 seq_printf(m, "user { vuid = %d; };\n", id);
1134 break;
1135 case TRACKER_GID:
1136 seq_printf(m, "group { gid = %d; };\n", id);
1137 break;
1138 case TRACKER_VGID:
1139 seq_printf(m, "group { vgid = %d; };\n", id);
1140 break;
1141 default:
1142 seq_printf(m, "UNKNOWN { field = %d };\n", id);
7e6f9ef6 1143 }
7e6f9ef6
MD		 1144 return 0;
1145}
1146
1147static
d1f652f8
MD		 1148const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1149 .start = id_list_start,
1150 .next = id_list_next,
1151 .stop = id_list_stop,
1152 .show = id_list_show,
7e6f9ef6
MD		 1153};
1154
1155static
d1f652f8 1156int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
7e6f9ef6 1157{
d1f652f8 1158 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
7e6f9ef6
MD		 1159}
1160
1161static
d1f652f8 1162int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
7e6f9ef6
MD		 1163{
1164 struct seq_file *m = file->private_data;
d1f652f8 1165 struct lttng_id_tracker *id_tracker = m->private;
7e6f9ef6
MD		 1166 int ret;
1167
d1f652f8 1168 WARN_ON_ONCE(!id_tracker);
7e6f9ef6 1169 ret = seq_release(inode, file);
d1f652f8
MD		 1170 if (!ret)
1171 fput(id_tracker->session->file);
7e6f9ef6
MD		 1172 return ret;
1173}
1174
d1f652f8 1175const struct file_operations lttng_tracker_ids_list_fops = {
7e6f9ef6 1176 .owner = THIS_MODULE,
d1f652f8 1177 .open = lttng_tracker_ids_list_open,
7e6f9ef6
MD		 1178 .read = seq_read,
1179 .llseek = seq_lseek,
d1f652f8 1180 .release = lttng_tracker_ids_list_release,
7e6f9ef6
MD		 1181};
1182
d1f652f8
MD		 1183int lttng_session_list_tracker_ids(struct lttng_session *session,
1184 enum tracker_type tracker_type)
7e6f9ef6 1185{
d1f652f8 1186 struct file *tracker_ids_list_file;
7e6f9ef6
MD		 1187 struct seq_file *m;
1188 int file_fd, ret;
1189
1190 file_fd = lttng_get_unused_fd();
1191 if (file_fd < 0) {
1192 ret = file_fd;
1193 goto fd_error;
1194 }
1195
d1f652f8
MD		 1196 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1197 &lttng_tracker_ids_list_fops,
7e6f9ef6 1198 NULL, O_RDWR);
d1f652f8
MD		 1199 if (IS_ERR(tracker_ids_list_file)) {
1200 ret = PTR_ERR(tracker_ids_list_file);
7e6f9ef6
MD		 1201 goto file_error;
1202 }
98d7281c
MJ		 1203 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1204 ret = -EOVERFLOW;
9c1f4643
MD		 1205 goto refcount_error;
1206 }
d1f652f8 1207 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
7e6f9ef6
MD		 1208 if (ret < 0)
1209 goto open_error;
d1f652f8
MD		 1210 m = tracker_ids_list_file->private_data;
1211
1212 m->private = get_tracker(session, tracker_type);
1213 BUG_ON(!m->private);
1214 fd_install(file_fd, tracker_ids_list_file);
7e6f9ef6
MD		 1215
1216 return file_fd;
1217
1218open_error:
9c1f4643
MD		 1219 atomic_long_dec(&session->file->f_count);
1220refcount_error:
d1f652f8 1221 fput(tracker_ids_list_file);
7e6f9ef6
MD		 1222file_error:
1223 put_unused_fd(file_fd);
1224fd_error:
1225 return ret;
1226}
1227
3c997079
MD		 1228/*
1229 * Enabler management.
1230 */
1231static
4993071a
PP		 1232int lttng_match_enabler_star_glob(const char *desc_name,
1233 const char *pattern)
3c997079 1234{
cbc19040
MD		 1235 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1236 desc_name, LTTNG_SIZE_MAX))
3c997079
MD		 1237 return 0;
1238 return 1;
1239}
1240
1241static
4ecb5ad5
MD		 1242int lttng_match_enabler_name(const char *desc_name,
1243 const char *name)
3c997079 1244{
4ecb5ad5 1245 if (strcmp(desc_name, name))
3c997079
MD		 1246 return 0;
1247 return 1;
1248}
1249
1250static
1251int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1252 struct lttng_enabler *enabler)
1253{
4ecb5ad5 1254 const char *desc_name, *enabler_name;
ad594e3a 1255 bool compat = false, entry = false;
4ecb5ad5
MD		 1256
1257 enabler_name = enabler->event_param.name;
1258 switch (enabler->event_param.instrumentation) {
1259 case LTTNG_KERNEL_TRACEPOINT:
1260 desc_name = desc->name;
ad594e3a
MD		 1261 switch (enabler->type) {
1262 case LTTNG_ENABLER_STAR_GLOB:
1263 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1264 case LTTNG_ENABLER_NAME:
1265 return lttng_match_enabler_name(desc_name, enabler_name);
1266 default:
1267 return -EINVAL;
1268 }
4ecb5ad5
MD		 1269 break;
1270 case LTTNG_KERNEL_SYSCALL:
1271 desc_name = desc->name;
ad594e3a 1272 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
4ecb5ad5 1273 desc_name += strlen("compat_");
ad594e3a
MD		 1274 compat = true;
1275 }
4ecb5ad5
MD		 1276 if (!strncmp(desc_name, "syscall_exit_",
1277 strlen("syscall_exit_"))) {
1278 desc_name += strlen("syscall_exit_");
1279 } else if (!strncmp(desc_name, "syscall_entry_",
1280 strlen("syscall_entry_"))) {
1281 desc_name += strlen("syscall_entry_");
ad594e3a 1282 entry = true;
4ecb5ad5
MD		 1283 } else {
1284 WARN_ON_ONCE(1);
1285 return -EINVAL;
1286 }
ad594e3a
MD		 1287 switch (enabler->event_param.u.syscall.entryexit) {
1288 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1289 break;
1290 case LTTNG_KERNEL_SYSCALL_ENTRY:
1291 if (!entry)
1292 return 0;
1293 break;
1294 case LTTNG_KERNEL_SYSCALL_EXIT:
1295 if (entry)
1296 return 0;
1297 break;
1298 default:
1299 return -EINVAL;
1300 }
1301 switch (enabler->event_param.u.syscall.abi) {
1302 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1303 break;
1304 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1305 if (compat)
1306 return 0;
1307 break;
1308 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1309 if (!compat)
1310 return 0;
1311 break;
1312 default:
1313 return -EINVAL;
1314 }
1315 switch (enabler->event_param.u.syscall.match) {
1316 case LTTNG_SYSCALL_MATCH_NAME:
1317 switch (enabler->type) {
1318 case LTTNG_ENABLER_STAR_GLOB:
1319 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1320 case LTTNG_ENABLER_NAME:
1321 return lttng_match_enabler_name(desc_name, enabler_name);
1322 default:
1323 return -EINVAL;
1324 }
1325 break;
1326 case LTTNG_SYSCALL_MATCH_NR:
1327 return -EINVAL; /* Not implemented. */
1328 default:
1329 return -EINVAL;
1330 }
4ecb5ad5
MD		 1331 break;
1332 default:
1333 WARN_ON_ONCE(1);
1334 return -EINVAL;
1335 }
3c997079
MD		 1336}
1337
1338static
1339int lttng_event_match_enabler(struct lttng_event *event,
1340 struct lttng_enabler *enabler)
1341{
33a39a3c
MD		 1342 if (enabler->event_param.instrumentation != event->instrumentation)
1343 return 0;
3c997079
MD		 1344 if (lttng_desc_match_enabler(event->desc, enabler)
1345 && event->chan == enabler->chan)
1346 return 1;
1347 else
1348 return 0;
1349}
1350
1351static
1352struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event,
1353 struct lttng_enabler *enabler)
1354{
1355 struct lttng_enabler_ref *enabler_ref;
1356
1357 list_for_each_entry(enabler_ref,
1358 &event->enablers_ref_head, node) {
1359 if (enabler_ref->ref == enabler)
1360 return enabler_ref;
1361 }
1362 return NULL;
1363}
1364
3c997079 1365static
33a39a3c 1366void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler)
3c997079
MD		 1367{
1368 struct lttng_session *session = enabler->chan->session;
1369 struct lttng_probe_desc *probe_desc;
1370 const struct lttng_event_desc *desc;
1371 int i;
1372 struct list_head *probe_list;
1373
1374 probe_list = lttng_get_probe_list_head();
1375 /*
1376 * For each probe event, if we find that a probe event matches
1377 * our enabler, create an associated lttng_event if not
1378 * already present.
1379 */
1380 list_for_each_entry(probe_desc, probe_list, head) {
1381 for (i = 0; i < probe_desc->nr_events; i++) {
1382 int found = 0;
1383 struct hlist_head *head;
1384 const char *event_name;
1385 size_t name_len;
1386 uint32_t hash;
1387 struct lttng_event *event;
1388
1389 desc = probe_desc->event_desc[i];
1390 if (!lttng_desc_match_enabler(desc, enabler))
1391 continue;
1392 event_name = desc->name;
1393 name_len = strlen(event_name);
1394
1395 /*
1396 * Check if already created.
1397 */
1398 hash = jhash(event_name, name_len, 0);
1399 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
d216ecae 1400 lttng_hlist_for_each_entry(event, head, hlist) {
3c997079
MD		 1401 if (event->desc == desc
1402 && event->chan == enabler->chan)
1403 found = 1;
1404 }
1405 if (found)
1406 continue;
1407
1408 /*
1409 * We need to create an event for this
1410 * event probe.
1411 */
1412 event = _lttng_event_create(enabler->chan,
1413 NULL, NULL, desc,
1414 LTTNG_KERNEL_TRACEPOINT);
1415 if (!event) {
1416 printk(KERN_INFO "Unable to create event %s\n",
1417 probe_desc->event_desc[i]->name);
1418 }
1419 }
1420 }
1421}
1422
33a39a3c
MD		 1423static
1424void lttng_create_syscall_if_missing(struct lttng_enabler *enabler)
1425{
1426 int ret;
1427
1428 ret = lttng_syscalls_register(enabler->chan, NULL);
1429 WARN_ON_ONCE(ret);
1430}
1431
1432/*
1433 * Create struct lttng_event if it is missing and present in the list of
1434 * tracepoint probes.
1435 * Should be called with sessions mutex held.
1436 */
1437static
1438void lttng_create_event_if_missing(struct lttng_enabler *enabler)
1439{
1440 switch (enabler->event_param.instrumentation) {
1441 case LTTNG_KERNEL_TRACEPOINT:
1442 lttng_create_tracepoint_if_missing(enabler);
1443 break;
1444 case LTTNG_KERNEL_SYSCALL:
1445 lttng_create_syscall_if_missing(enabler);
1446 break;
1447 default:
1448 WARN_ON_ONCE(1);
1449 break;
1450 }
1451}
1452
3c997079
MD		 1453/*
1454 * Create events associated with an enabler (if not already present),
1455 * and add backward reference from the event to the enabler.
1456 * Should be called with sessions mutex held.
1457 */
1458static
1459int lttng_enabler_ref_events(struct lttng_enabler *enabler)
1460{
ad594e3a
MD		 1461 struct lttng_channel *chan = enabler->chan;
1462 struct lttng_session *session = chan->session;
3c997079
MD		 1463 struct lttng_event *event;
1464
ad594e3a
MD		 1465 if (enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
1466 enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT &&
1467 enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
1468 enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME &&
1469 !strcmp(enabler->event_param.name, "*")) {
1470 if (enabler->enabled)
1471 WRITE_ONCE(chan->syscall_all, 1);
1472 else
1473 WRITE_ONCE(chan->syscall_all, 0);
1474 }
1475
3c997079
MD		 1476 /* First ensure that probe events are created for this enabler. */
1477 lttng_create_event_if_missing(enabler);
1478
1479 /* For each event matching enabler in session event list. */
1480 list_for_each_entry(event, &session->events, list) {
1481 struct lttng_enabler_ref *enabler_ref;
1482
1483 if (!lttng_event_match_enabler(event, enabler))
1484 continue;
1485 enabler_ref = lttng_event_enabler_ref(event, enabler);
1486 if (!enabler_ref) {
1487 /*
1488 * If no backward ref, create it.
1489 * Add backward ref from event to enabler.
1490 */
1491 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
1492 if (!enabler_ref)
1493 return -ENOMEM;
1494 enabler_ref->ref = enabler;
1495 list_add(&enabler_ref->node,
1496 &event->enablers_ref_head);
1497 }
1498
f127e61e
MD		 1499 /*
1500 * Link filter bytecodes if not linked yet.
1501 */
1502 lttng_enabler_event_link_bytecode(event, enabler);
1503
3c997079
MD		 1504 /* TODO: merge event context. */
1505 }
1506 return 0;
1507}
1508
1509/*
1510 * Called at module load: connect the probe on all enablers matching
1511 * this event.
1512 * Called with sessions lock held.
1513 */
1514int lttng_fix_pending_events(void)
1515{
1516 struct lttng_session *session;
1517
1518 list_for_each_entry(session, &sessions, list)
1519 lttng_session_lazy_sync_enablers(session);
1520 return 0;
1521}
1522
1523struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
1524 struct lttng_kernel_event *event_param,
1525 struct lttng_channel *chan)
1526{
1527 struct lttng_enabler *enabler;
1528
1529 enabler = kzalloc(sizeof(*enabler), GFP_KERNEL);
1530 if (!enabler)
1531 return NULL;
1532 enabler->type = type;
07dfc1d0 1533 INIT_LIST_HEAD(&enabler->filter_bytecode_head);
3c997079
MD		 1534 memcpy(&enabler->event_param, event_param,
1535 sizeof(enabler->event_param));
1536 enabler->chan = chan;
1537 /* ctx left NULL */
4fd19d8a 1538 enabler->enabled = 0;
3c997079
MD		 1539 enabler->evtype = LTTNG_TYPE_ENABLER;
1540 mutex_lock(&sessions_mutex);
1541 list_add(&enabler->node, &enabler->chan->session->enablers_head);
1542 lttng_session_lazy_sync_enablers(enabler->chan->session);
1543 mutex_unlock(&sessions_mutex);
1544 return enabler;
1545}
1546
1547int lttng_enabler_enable(struct lttng_enabler *enabler)
1548{
1549 mutex_lock(&sessions_mutex);
1550 enabler->enabled = 1;
1551 lttng_session_lazy_sync_enablers(enabler->chan->session);
1552 mutex_unlock(&sessions_mutex);
1553 return 0;
1554}
1555
1556int lttng_enabler_disable(struct lttng_enabler *enabler)
1557{
1558 mutex_lock(&sessions_mutex);
1559 enabler->enabled = 0;
1560 lttng_session_lazy_sync_enablers(enabler->chan->session);
1561 mutex_unlock(&sessions_mutex);
1562 return 0;
1563}
1564
07dfc1d0
MD		 1565int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
1566 struct lttng_kernel_filter_bytecode __user *bytecode)
1567{
1568 struct lttng_filter_bytecode_node *bytecode_node;
1569 uint32_t bytecode_len;
1570 int ret;
1571
1572 ret = get_user(bytecode_len, &bytecode->len);
1573 if (ret)
1574 return ret;
1575 bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len,
1576 GFP_KERNEL);
1577 if (!bytecode_node)
1578 return -ENOMEM;
1579 ret = copy_from_user(&bytecode_node->bc, bytecode,
1580 sizeof(*bytecode) + bytecode_len);
1581 if (ret)
1582 goto error_free;
1583 bytecode_node->enabler = enabler;
1584 /* Enforce length based on allocated size */
1585 bytecode_node->bc.len = bytecode_len;
1586 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
1587 lttng_session_lazy_sync_enablers(enabler->chan->session);
1588 return 0;
1589
1590error_free:
1591 kfree(bytecode_node);
1592 return ret;
1593}
1594
3aed4dca
FD		 1595int lttng_event_add_callsite(struct lttng_event *event,
1596 struct lttng_kernel_event_callsite __user *callsite)
1597{
1598
1599 switch (event->instrumentation) {
1600 case LTTNG_KERNEL_UPROBE:
1601 return lttng_uprobes_add_callsite(event, callsite);
1602 default:
1603 return -EINVAL;
1604 }
1605}
1606
3c997079
MD		 1607int lttng_enabler_attach_context(struct lttng_enabler *enabler,
1608 struct lttng_kernel_context *context_param)
1609{
1610 return -ENOSYS;
1611}
1612
1613static
1614void lttng_enabler_destroy(struct lttng_enabler *enabler)
1615{
07dfc1d0
MD		 1616 struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node;
1617
1618 /* Destroy filter bytecode */
1619 list_for_each_entry_safe(filter_node, tmp_filter_node,
1620 &enabler->filter_bytecode_head, node) {
1621 kfree(filter_node);
1622 }
1623
3c997079
MD		 1624 /* Destroy contexts */
1625 lttng_destroy_context(enabler->ctx);
1626
1627 list_del(&enabler->node);
1628 kfree(enabler);
1629}
1630
1631/*
1632 * lttng_session_sync_enablers should be called just before starting a
1633 * session.
1634 * Should be called with sessions mutex held.
1635 */
1636static
1637void lttng_session_sync_enablers(struct lttng_session *session)
1638{
1639 struct lttng_enabler *enabler;
1640 struct lttng_event *event;
1641
1642 list_for_each_entry(enabler, &session->enablers_head, node)
1643 lttng_enabler_ref_events(enabler);
1644 /*
1645 * For each event, if at least one of its enablers is enabled,
1646 * and its channel and session transient states are enabled, we
1647 * enable the event, else we disable it.
1648 */
1649 list_for_each_entry(event, &session->events, list) {
1650 struct lttng_enabler_ref *enabler_ref;
07dfc1d0
MD		 1651 struct lttng_bytecode_runtime *runtime;
1652 int enabled = 0, has_enablers_without_bytecode = 0;
3c997079 1653
4ecb5ad5
MD		 1654 switch (event->instrumentation) {
1655 case LTTNG_KERNEL_TRACEPOINT:
1656 case LTTNG_KERNEL_SYSCALL:
3c997079
MD		 1657 /* Enable events */
1658 list_for_each_entry(enabler_ref,
1659 &event->enablers_ref_head, node) {
1660 if (enabler_ref->ref->enabled) {
1661 enabled = 1;
1662 break;
1663 }
1664 }
4ecb5ad5
MD		 1665 break;
1666 default:
3c997079
MD		 1667 /* Not handled with lazy sync. */
1668 continue;
1669 }
1670 /*
1671 * Enabled state is based on union of enablers, with
1672 * intesection of session and channel transient enable
1673 * states.
1674 */
1675 enabled = enabled && session->tstate && event->chan->tstate;
1676
a8f2d0c7 1677 WRITE_ONCE(event->enabled, enabled);
3c997079
MD		 1678 /*
1679 * Sync tracepoint registration with event enabled
1680 * state.
1681 */
1682 if (enabled) {
1683 register_event(event);
1684 } else {
1685 _lttng_event_unregister(event);
1686 }
07dfc1d0
MD		 1687
1688 /* Check if has enablers without bytecode enabled */
1689 list_for_each_entry(enabler_ref,
1690 &event->enablers_ref_head, node) {
1691 if (enabler_ref->ref->enabled
1692 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
1693 has_enablers_without_bytecode = 1;
1694 break;
1695 }
1696 }
1697 event->has_enablers_without_bytecode =
1698 has_enablers_without_bytecode;
1699
1700 /* Enable filters */
1701 list_for_each_entry(runtime,
f127e61e 1702 &event->bytecode_runtime_head, node)
07dfc1d0 1703 lttng_filter_sync_state(runtime);
3c997079
MD		 1704 }
1705}
1706
1707/*
1708 * Apply enablers to session events, adding events to session if need
1709 * be. It is required after each modification applied to an active
1710 * session, and right before session "start".
1711 * "lazy" sync means we only sync if required.
1712 * Should be called with sessions mutex held.
1713 */
1714static
1715void lttng_session_lazy_sync_enablers(struct lttng_session *session)
1716{
1717 /* We can skip if session is not active */
1718 if (!session->active)
1719 return;
1720 lttng_session_sync_enablers(session);
1721}
1722
1ec3f75a 1723/*
d83004aa
JD		 1724 * Serialize at most one packet worth of metadata into a metadata
1725 * channel.
92d9f5e6
MD		 1726 * We grab the metadata cache mutex to get exclusive access to our metadata
1727 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1728 * allows us to do racy operations such as looking for remaining space left in
1729 * packet and write, since mutual exclusion protects us from concurrent writes.
1730 * Mutual exclusion on the metadata cache allow us to read the cache content
1731 * without racing against reallocation of the cache by updates.
35097f36
JD		 1732 * Returns the number of bytes written in the channel, 0 if no data
1733 * was written and a negative value on error.
1ec3f75a 1734 */
b3b8072b 1735int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
122c63cb 1736 struct channel *chan, bool *coherent)
d83004aa
JD		 1737{
1738 struct lib_ring_buffer_ctx ctx;
1739 int ret = 0;
1740 size_t len, reserve_len;
1741
f613e3e6 1742 /*
92d9f5e6
MD		 1743 * Ensure we support mutiple get_next / put sequences followed by
1744 * put_next. The metadata cache lock protects reading the metadata
1745 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1746 * "flush" operations on the buffer invoked by different processes.
1747 * Moreover, since the metadata cache memory can be reallocated, we
1748 * need to have exclusive access against updates even though we only
1749 * read it.
f613e3e6 1750 */
92d9f5e6 1751 mutex_lock(&stream->metadata_cache->lock);
f613e3e6
MD		 1752 WARN_ON(stream->metadata_in < stream->metadata_out);
1753 if (stream->metadata_in != stream->metadata_out)
de23d59d 1754 goto end;
f613e3e6 1755
9616f0bf
JD		 1756 /* Metadata regenerated, change the version. */
1757 if (stream->metadata_cache->version != stream->version)
1758 stream->version = stream->metadata_cache->version;
1759
d83004aa 1760 len = stream->metadata_cache->metadata_written -
f613e3e6 1761 stream->metadata_in;
9de2c215 1762 if (!len)
de23d59d 1763 goto end;
d83004aa 1764 reserve_len = min_t(size_t,
b3b8072b 1765 stream->transport->ops.packet_avail_size(chan),
d83004aa 1766 len);
b3b8072b 1767 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
d83004aa
JD		 1768 sizeof(char), -1);
1769 /*
1770 * If reservation failed, return an error to the caller.
1771 */
b3b8072b 1772 ret = stream->transport->ops.event_reserve(&ctx, 0);
d83004aa
JD		 1773 if (ret != 0) {
1774 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
122c63cb 1775 stream->coherent = false;
d83004aa
JD		 1776 goto end;
1777 }
b3b8072b 1778 stream->transport->ops.event_write(&ctx,
f613e3e6 1779 stream->metadata_cache->data + stream->metadata_in,
d83004aa 1780 reserve_len);
b3b8072b 1781 stream->transport->ops.event_commit(&ctx);
f613e3e6 1782 stream->metadata_in += reserve_len;
3780dda9 1783 if (reserve_len < len)
122c63cb
MD		 1784 stream->coherent = false;
1785 else
1786 stream->coherent = true;
d83004aa
JD		 1787 ret = reserve_len;
1788
1789end:
122c63cb
MD		 1790 if (coherent)
1791 *coherent = stream->coherent;
92d9f5e6 1792 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 1793 return ret;
1794}
1795
122c63cb
MD		 1796static
1797void lttng_metadata_begin(struct lttng_session *session)
1798{
3780dda9
MD		 1799 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
1800 mutex_lock(&session->metadata_cache->lock);
122c63cb
MD		 1801}
1802
1803static
1804void lttng_metadata_end(struct lttng_session *session)
1805{
3780dda9
MD		 1806 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
1807 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
1808 struct lttng_metadata_stream *stream;
1809
3780dda9
MD		 1810 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
1811 wake_up_interruptible(&stream->read_wait);
e0d82ce5 1812 mutex_unlock(&session->metadata_cache->lock);
3780dda9 1813 }
122c63cb
MD		 1814}
1815
d83004aa
JD		 1816/*
1817 * Write the metadata to the metadata cache.
1818 * Must be called with sessions_mutex held.
92d9f5e6
MD		 1819 * The metadata cache lock protects us from concurrent read access from
1820 * thread outputting metadata content to ring buffer.
122c63cb
MD		 1821 * The content of the printf is printed as a single atomic metadata
1822 * transaction.
d83004aa 1823 */
a90917c3 1824int lttng_metadata_printf(struct lttng_session *session,
c099397a
MD		 1825 const char *fmt, ...)
1826{
c099397a 1827 char *str;
d83004aa 1828 size_t len;
c099397a
MD		 1829 va_list ap;
1830
57ccbfa6 1831 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
c099397a
MD		 1832
1833 va_start(ap, fmt);
1834 str = kvasprintf(GFP_KERNEL, fmt, ap);
1835 va_end(ap);
1836 if (!str)
1837 return -ENOMEM;
1838
1ec3f75a 1839 len = strlen(str);
3780dda9 1840 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
d83004aa
JD		 1841 if (session->metadata_cache->metadata_written + len >
1842 session->metadata_cache->cache_alloc) {
1843 char *tmp_cache_realloc;
1844 unsigned int tmp_cache_alloc_size;
1845
1846 tmp_cache_alloc_size = max_t(unsigned int,
1847 session->metadata_cache->cache_alloc + len,
1848 session->metadata_cache->cache_alloc << 1);
0ca42eb7 1849 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
d83004aa
JD		 1850 if (!tmp_cache_realloc)
1851 goto err;
a606b6e8
ML		 1852 if (session->metadata_cache->data) {
1853 memcpy(tmp_cache_realloc,
1854 session->metadata_cache->data,
1855 session->metadata_cache->cache_alloc);
1856 vfree(session->metadata_cache->data);
1857 }
1858
d83004aa
JD		 1859 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
1860 session->metadata_cache->data = tmp_cache_realloc;
c099397a 1861 }
d83004aa
JD		 1862 memcpy(session->metadata_cache->data +
1863 session->metadata_cache->metadata_written,
1864 str, len);
1865 session->metadata_cache->metadata_written += len;
c099397a 1866 kfree(str);
d83004aa 1867
d83004aa
JD		 1868 return 0;
1869
1870err:
1871 kfree(str);
1872 return -ENOMEM;
c099397a
MD		 1873}
1874
f513b2bf
MD		 1875static
1876int print_tabs(struct lttng_session *session, size_t nesting)
1877{
1878 size_t i;
1879
1880 for (i = 0; i < nesting; i++) {
1881 int ret;
1882
1883 ret = lttng_metadata_printf(session, " ");
1884 if (ret) {
1885 return ret;
1886 }
1887 }
1888 return 0;
1889}
1890
1891/*
1892 * Must be called with sessions_mutex held.
1893 */
1894static
1895int _lttng_struct_type_statedump(struct lttng_session *session,
1896 const struct lttng_type *type,
1897 size_t nesting)
1898{
1899 int ret;
1900 uint32_t i, nr_fields;
1901
1902 ret = print_tabs(session, nesting);
1903 if (ret)
1904 return ret;
1905 ret = lttng_metadata_printf(session,
1906 "struct {\n");
1907 if (ret)
1908 return ret;
1909 nr_fields = type->u._struct.nr_fields;
1910 for (i = 0; i < nr_fields; i++) {
1911 const struct lttng_event_field *iter_field;
1912
1913 iter_field = &type->u._struct.fields[i];
1914 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1915 if (ret)
1916 return ret;
1917 }
1918 ret = print_tabs(session, nesting);
1919 if (ret)
1920 return ret;
1921 ret = lttng_metadata_printf(session,
1922 "}");
1923 return ret;
1924}
1925
1926/*
1927 * Must be called with sessions_mutex held.
1928 */
1929static
1930int _lttng_struct_statedump(struct lttng_session *session,
1931 const struct lttng_event_field *field,
1932 size_t nesting)
1933{
1934 int ret;
1935
1936 ret = _lttng_struct_type_statedump(session,
1937 &field->type, nesting);
1938 if (ret)
1939 return ret;
1940 ret = lttng_metadata_printf(session,
1941 "_%s;\n",
1942 field->name);
1943 return ret;
1944}
1945
65c85aa6
MD		 1946/*
1947 * Must be called with sessions_mutex held.
1948 */
1949static
1950int _lttng_variant_type_statedump(struct lttng_session *session,
1951 const struct lttng_type *type,
1952 size_t nesting)
1953{
1954 int ret;
1955 uint32_t i, nr_choices;
1956
1957 ret = print_tabs(session, nesting);
1958 if (ret)
1959 return ret;
1960 ret = lttng_metadata_printf(session,
1961 "variant <_%s> {\n",
1962 type->u.variant.tag_name);
1963 if (ret)
1964 return ret;
1965 nr_choices = type->u.variant.nr_choices;
1966 for (i = 0; i < nr_choices; i++) {
1967 const struct lttng_event_field *iter_field;
1968
1969 iter_field = &type->u.variant.choices[i];
1970 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1971 if (ret)
1972 return ret;
1973 }
1974 ret = print_tabs(session, nesting);
1975 if (ret)
1976 return ret;
1977 ret = lttng_metadata_printf(session,
1978 "}");
1979 return ret;
1980}
1981
1982/*
1983 * Must be called with sessions_mutex held.
1984 */
1985static
1986int _lttng_variant_statedump(struct lttng_session *session,
1987 const struct lttng_event_field *field,
1988 size_t nesting)
1989{
1990 int ret;
1991
1992 ret = _lttng_variant_type_statedump(session,
1993 &field->type, nesting);
1994 if (ret)
1995 return ret;
1996 ret = lttng_metadata_printf(session,
1997 "_%s;\n",
1998 field->name);
1999 return ret;
2000}
2001
f513b2bf
MD		 2002/*
2003 * Must be called with sessions_mutex held.
2004 */
2005static
2006int _lttng_array_compound_statedump(struct lttng_session *session,
2007 const struct lttng_event_field *field,
2008 size_t nesting)
2009{
2010 int ret;
2011 const struct lttng_type *elem_type;
2012
65c85aa6 2013 /* Only array of structures and variants are currently supported. */
f513b2bf
MD		 2014 elem_type = field->type.u.array_compound.elem_type;
2015 switch (elem_type->atype) {
2016 case atype_struct:
2017 ret = _lttng_struct_type_statedump(session, elem_type, nesting);
2018 if (ret)
2019 return ret;
2020 break;
65c85aa6
MD		 2021 case atype_variant:
2022 ret = _lttng_variant_type_statedump(session, elem_type, nesting);
2023 if (ret)
2024 return ret;
2025 break;
f513b2bf
MD		 2026 default:
2027 return -EINVAL;
2028 }
2029 ret = lttng_metadata_printf(session,
2030 " _%s[%u];\n",
2031 field->name,
2032 field->type.u.array_compound.length);
2033 return ret;
2034}
2035
2036/*
2037 * Must be called with sessions_mutex held.
2038 */
2039static
2040int _lttng_sequence_compound_statedump(struct lttng_session *session,
2041 const struct lttng_event_field *field,
2042 size_t nesting)
2043{
2044 int ret;
2045 const char *length_name;
2046 const struct lttng_type *elem_type;
2047
2048 length_name = field->type.u.sequence_compound.length_name;
2049
65c85aa6 2050 /* Only array of structures and variants are currently supported. */
f513b2bf
MD		 2051 elem_type = field->type.u.sequence_compound.elem_type;
2052 switch (elem_type->atype) {
2053 case atype_struct:
2054 ret = _lttng_struct_type_statedump(session, elem_type, nesting);
2055 if (ret)
2056 return ret;
2057 break;
65c85aa6
MD		 2058 case atype_variant:
2059 ret = _lttng_variant_type_statedump(session, elem_type, nesting);
2060 if (ret)
2061 return ret;
2062 break;
f513b2bf
MD		 2063 default:
2064 return -EINVAL;
2065 }
2066 ret = lttng_metadata_printf(session,
2067 " _%s[ _%s ];\n",
2068 field->name,
2069 length_name);
2070 return ret;
2071}
2072
141ddf28
MD		 2073/*
2074 * Must be called with sessions_mutex held.
2075 */
2076static
2077int _lttng_enum_statedump(struct lttng_session *session,
2078 const struct lttng_event_field *field,
2079 size_t nesting)
2080{
2081 const struct lttng_enum_desc *enum_desc;
2082 const struct lttng_integer_type *container_type;
2083 int ret;
2084 unsigned int i, nr_entries;
2085
2086 enum_desc = field->type.u.basic.enumeration.desc;
2087 container_type = &field->type.u.basic.enumeration.container_type;
2088 nr_entries = enum_desc->nr_entries;
2089
2090 ret = print_tabs(session, nesting);
2091 if (ret)
2092 goto end;
2093 ret = lttng_metadata_printf(session,
578e68ec 2094 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
141ddf28
MD		 2095 container_type->size,
2096 container_type->alignment,
2097 container_type->signedness,
2098 (container_type->encoding == lttng_encode_none)
2099 ? "none"
2100 : (container_type->encoding == lttng_encode_UTF8)
2101 ? "UTF8"
2102 : "ASCII",
578e68ec
GB		 2103 container_type->base,
2104#if __BYTE_ORDER == __BIG_ENDIAN
2105 container_type->reverse_byte_order ? " byte_order = le;" : ""
2106#else
2107 container_type->reverse_byte_order ? " byte_order = be;" : ""
2108#endif
2109 );
141ddf28
MD		 2110 if (ret)
2111 goto end;
2112 /* Dump all entries */
2113 for (i = 0; i < nr_entries; i++) {
2114 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
2115 int j, len;
2116
2117 ret = print_tabs(session, nesting + 1);
2118 if (ret)
2119 goto end;
2120 ret = lttng_metadata_printf(session,
2121 "\"");
2122 if (ret)
2123 goto end;
2124 len = strlen(entry->string);
2125 /* Escape the character '"' */
2126 for (j = 0; j < len; j++) {
2127 char c = entry->string[j];
2128
2129 switch (c) {
2130 case '"':
2131 ret = lttng_metadata_printf(session,
2132 "\\\"");
2133 break;
2134 case '\\':
2135 ret = lttng_metadata_printf(session,
2136 "\\\\");
2137 break;
2138 default:
2139 ret = lttng_metadata_printf(session,
2140 "%c", c);
2141 break;
2142 }
2143 if (ret)
2144 goto end;
2145 }
08ad1061
PP		 2146 ret = lttng_metadata_printf(session, "\"");
2147 if (ret)
2148 goto end;
2149
2150 if (entry->options.is_auto) {
2151 ret = lttng_metadata_printf(session, ",\n");
2152 if (ret)
2153 goto end;
141ddf28 2154 } else {
7c559490
MD		 2155 ret = lttng_metadata_printf(session,
2156 " = ");
2157 if (ret)
2158 goto end;
2159 if (entry->start.signedness)
141ddf28 2160 ret = lttng_metadata_printf(session,
7c559490
MD		 2161 "%lld", (long long) entry->start.value);
2162 else
2163 ret = lttng_metadata_printf(session,
2164 "%llu", entry->start.value);
2165 if (ret)
2166 goto end;
2167 if (entry->start.signedness == entry->end.signedness &&
2168 entry->start.value
2169 == entry->end.value) {
141ddf28 2170 ret = lttng_metadata_printf(session,
7c559490
MD		 2171 ",\n");
2172 } else {
2173 if (entry->end.signedness) {
2174 ret = lttng_metadata_printf(session,
2175 " ... %lld,\n",
2176 (long long) entry->end.value);
2177 } else {
2178 ret = lttng_metadata_printf(session,
2179 " ... %llu,\n",
2180 entry->end.value);
2181 }
141ddf28 2182 }
7c559490
MD		 2183 if (ret)
2184 goto end;
141ddf28 2185 }
141ddf28
MD		 2186 }
2187 ret = print_tabs(session, nesting);
2188 if (ret)
2189 goto end;
2190 ret = lttng_metadata_printf(session, "} _%s;\n",
2191 field->name);
2192end:
2193 return ret;
2194}
2195
d83004aa
JD		 2196/*
2197 * Must be called with sessions_mutex held.
2198 */
c099397a 2199static
a90917c3 2200int _lttng_field_statedump(struct lttng_session *session,
f513b2bf
MD		 2201 const struct lttng_event_field *field,
2202 size_t nesting)
c099397a 2203{
c099397a 2204 int ret = 0;
c099397a 2205
8070f5c0
MD		 2206 switch (field->type.atype) {
2207 case atype_integer:
f513b2bf
MD		 2208 ret = print_tabs(session, nesting);
2209 if (ret)
2210 return ret;
8070f5c0 2211 ret = lttng_metadata_printf(session,
f513b2bf 2212 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
8070f5c0
MD		 2213 field->type.u.basic.integer.size,
2214 field->type.u.basic.integer.alignment,
2215 field->type.u.basic.integer.signedness,
2216 (field->type.u.basic.integer.encoding == lttng_encode_none)
2217 ? "none"
2218 : (field->type.u.basic.integer.encoding == lttng_encode_UTF8)
2219 ? "UTF8"
2220 : "ASCII",
2221 field->type.u.basic.integer.base,
5214fa50 2222#if __BYTE_ORDER == __BIG_ENDIAN
8070f5c0 2223 field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
c099397a 2224#else
8070f5c0 2225 field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
c099397a 2226#endif
8070f5c0
MD		 2227 field->name);
2228 break;
2229 case atype_enum:
141ddf28 2230 ret = _lttng_enum_statedump(session, field, nesting);
8070f5c0
MD		 2231 break;
2232 case atype_array:
3834b99f 2233 case atype_array_bitfield:
8070f5c0
MD		 2234 {
2235 const struct lttng_basic_type *elem_type;
2236
2237 elem_type = &field->type.u.array.elem_type;
43803cf2 2238 if (field->type.u.array.elem_alignment) {
f513b2bf
MD		 2239 ret = print_tabs(session, nesting);
2240 if (ret)
2241 return ret;
43803cf2 2242 ret = lttng_metadata_printf(session,
f513b2bf 2243 "struct { } align(%u) _%s_padding;\n",
43803cf2
MD		 2244 field->type.u.array.elem_alignment * CHAR_BIT,
2245 field->name);
2246 if (ret)
2247 return ret;
2248 }
f513b2bf
MD		 2249 ret = print_tabs(session, nesting);
2250 if (ret)
2251 return ret;
8070f5c0 2252 ret = lttng_metadata_printf(session,
f513b2bf 2253 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
8070f5c0
MD		 2254 elem_type->u.basic.integer.size,
2255 elem_type->u.basic.integer.alignment,
2256 elem_type->u.basic.integer.signedness,
2257 (elem_type->u.basic.integer.encoding == lttng_encode_none)
2258 ? "none"
2259 : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
2260 ? "UTF8"
2261 : "ASCII",
2262 elem_type->u.basic.integer.base,
5214fa50 2263#if __BYTE_ORDER == __BIG_ENDIAN
8070f5c0 2264 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
8fa75f34 2265#else
8070f5c0 2266 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
8fa75f34 2267#endif
8070f5c0
MD		 2268 field->name, field->type.u.array.length);
2269 break;
2270 }
2271 case atype_sequence:
3834b99f 2272 case atype_sequence_bitfield:
8070f5c0
MD		 2273 {
2274 const struct lttng_basic_type *elem_type;
2275 const struct lttng_basic_type *length_type;
2276
2277 elem_type = &field->type.u.sequence.elem_type;
2278 length_type = &field->type.u.sequence.length_type;
f513b2bf
MD		 2279 ret = print_tabs(session, nesting);
2280 if (ret)
2281 return ret;
8070f5c0 2282 ret = lttng_metadata_printf(session,
f513b2bf 2283 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
8070f5c0 2284 length_type->u.basic.integer.size,
32257272 2285 (unsigned int) length_type->u.basic.integer.alignment,
8070f5c0
MD		 2286 length_type->u.basic.integer.signedness,
2287 (length_type->u.basic.integer.encoding == lttng_encode_none)
2288 ? "none"
0635cdd4 2289 : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8)
8070f5c0 2290 ? "UTF8"
0635cdd4 2291 : "ASCII"),
8070f5c0 2292 length_type->u.basic.integer.base,
5214fa50 2293#if __BYTE_ORDER == __BIG_ENDIAN
8070f5c0 2294 length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
e0a7a7c4 2295#else
0635cdd4 2296 length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
e0a7a7c4 2297#endif
27d2368e
MD		 2298 field->name);
2299 if (ret)
2300 return ret;
2301
43803cf2 2302 if (field->type.u.sequence.elem_alignment) {
f513b2bf
MD		 2303 ret = print_tabs(session, nesting);
2304 if (ret)
2305 return ret;
43803cf2 2306 ret = lttng_metadata_printf(session,
f513b2bf 2307 "struct { } align(%u) _%s_padding;\n",
43803cf2
MD		 2308 field->type.u.sequence.elem_alignment * CHAR_BIT,
2309 field->name);
2310 if (ret)
2311 return ret;
2312 }
f513b2bf
MD		 2313 ret = print_tabs(session, nesting);
2314 if (ret)
2315 return ret;
27d2368e 2316 ret = lttng_metadata_printf(session,
f513b2bf 2317 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
8070f5c0 2318 elem_type->u.basic.integer.size,
32257272 2319 (unsigned int) elem_type->u.basic.integer.alignment,
8070f5c0
MD		 2320 elem_type->u.basic.integer.signedness,
2321 (elem_type->u.basic.integer.encoding == lttng_encode_none)
2322 ? "none"
0635cdd4 2323 : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
8070f5c0 2324 ? "UTF8"
0635cdd4 2325 : "ASCII"),
8070f5c0 2326 elem_type->u.basic.integer.base,
5214fa50 2327#if __BYTE_ORDER == __BIG_ENDIAN
8070f5c0 2328 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
8fa75f34 2329#else
8070f5c0 2330 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
8fa75f34 2331#endif
8070f5c0 2332 field->name,
27d2368e 2333 field->name);
8070f5c0
MD		 2334 break;
2335 }
c099397a 2336
8070f5c0
MD		 2337 case atype_string:
2338 /* Default encoding is UTF8 */
f513b2bf
MD		 2339 ret = print_tabs(session, nesting);
2340 if (ret)
2341 return ret;
8070f5c0 2342 ret = lttng_metadata_printf(session,
f513b2bf 2343 "string%s _%s;\n",
8070f5c0
MD		 2344 field->type.u.basic.string.encoding == lttng_encode_ASCII ?
2345 " { encoding = ASCII; }" : "",
2346 field->name);
2347 break;
f513b2bf
MD		 2348 case atype_struct:
2349 ret = _lttng_struct_statedump(session, field, nesting);
2350 break;
2351 case atype_array_compound:
2352 ret = _lttng_array_compound_statedump(session, field, nesting);
2353 break;
2354 case atype_sequence_compound:
2355 ret = _lttng_sequence_compound_statedump(session, field, nesting);
2356 break;
65c85aa6
MD		 2357 case atype_variant:
2358 ret = _lttng_variant_statedump(session, field, nesting);
2359 break;
f513b2bf 2360
8070f5c0
MD		 2361 default:
2362 WARN_ON_ONCE(1);
2363 return -EINVAL;
2364 }
2365 return ret;
2366}
2367
2368static
a90917c3 2369int _lttng_context_metadata_statedump(struct lttng_session *session,
8070f5c0
MD		 2370 struct lttng_ctx *ctx)
2371{
2372 int ret = 0;
2373 int i;
2374
2375 if (!ctx)
2376 return 0;
2377 for (i = 0; i < ctx->nr_fields; i++) {
2378 const struct lttng_ctx_field *field = &ctx->fields[i];
2379
f513b2bf 2380 ret = _lttng_field_statedump(session, &field->event_field, 2);
8070f5c0
MD		 2381 if (ret)
2382 return ret;
2383 }
2384 return ret;
2385}
2386
2387static
a90917c3
MD		 2388int _lttng_fields_metadata_statedump(struct lttng_session *session,
2389 struct lttng_event *event)
8070f5c0
MD		 2390{
2391 const struct lttng_event_desc *desc = event->desc;
2392 int ret = 0;
2393 int i;
2394
2395 for (i = 0; i < desc->nr_fields; i++) {
2396 const struct lttng_event_field *field = &desc->fields[i];
2397
f513b2bf 2398 ret = _lttng_field_statedump(session, field, 2);
8070f5c0
MD		 2399 if (ret)
2400 return ret;
c099397a
MD		 2401 }
2402 return ret;
2403}
2404
d83004aa
JD		 2405/*
2406 * Must be called with sessions_mutex held.
122c63cb
MD		 2407 * The entire event metadata is printed as a single atomic metadata
2408 * transaction.
d83004aa 2409 */
c099397a 2410static
a90917c3
MD		 2411int _lttng_event_metadata_statedump(struct lttng_session *session,
2412 struct lttng_channel *chan,
2413 struct lttng_event *event)
c099397a
MD		 2414{
2415 int ret = 0;
2416
57ccbfa6 2417 if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 2418 return 0;
d83004aa 2419 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 2420 return 0;
2421
122c63cb
MD		 2422 lttng_metadata_begin(session);
2423
c099397a
MD		 2424 ret = lttng_metadata_printf(session,
2425 "event {\n"
ae734547 2426 " name = \"%s\";\n"
c099397a 2427 " id = %u;\n"
b9074a1b 2428 " stream_id = %u;\n",
c099397a
MD		 2429 event->desc->name,
2430 event->id,
2431 event->chan->id);
2432 if (ret)
2433 goto end;
2434
b9074a1b
MD		 2435 if (event->ctx) {
2436 ret = lttng_metadata_printf(session,
2437 " context := struct {\n");
2438 if (ret)
2439 goto end;
2440 }
a90917c3 2441 ret = _lttng_context_metadata_statedump(session, event->ctx);
8070f5c0
MD		 2442 if (ret)
2443 goto end;
b9074a1b
MD		 2444 if (event->ctx) {
2445 ret = lttng_metadata_printf(session,
2446 " };\n");
2447 if (ret)
2448 goto end;
2449 }
8070f5c0
MD		 2450
2451 ret = lttng_metadata_printf(session,
8070f5c0
MD		 2452 " fields := struct {\n"
2453 );
2454 if (ret)
2455 goto end;
2456
a90917c3 2457 ret = _lttng_fields_metadata_statedump(session, event);
c099397a
MD		 2458 if (ret)
2459 goto end;
2460
2461 /*
2462 * LTTng space reservation can only reserve multiples of the
2463 * byte size.
2464 */
2465 ret = lttng_metadata_printf(session,
9115fbdc
MD		 2466 " };\n"
2467 "};\n\n");
c099397a
MD		 2468 if (ret)
2469 goto end;
2470
c099397a
MD		 2471 event->metadata_dumped = 1;
2472end:
122c63cb 2473 lttng_metadata_end(session);
c099397a
MD		 2474 return ret;
2475
2476}
2477
d83004aa
JD		 2478/*
2479 * Must be called with sessions_mutex held.
122c63cb
MD		 2480 * The entire channel metadata is printed as a single atomic metadata
2481 * transaction.
d83004aa 2482 */
c099397a 2483static
a90917c3
MD		 2484int _lttng_channel_metadata_statedump(struct lttng_session *session,
2485 struct lttng_channel *chan)
c099397a
MD		 2486{
2487 int ret = 0;
2488
57ccbfa6 2489 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
c099397a 2490 return 0;
d83004aa
JD		 2491
2492 if (chan->channel_type == METADATA_CHANNEL)
c099397a
MD		 2493 return 0;
2494
122c63cb
MD		 2495 lttng_metadata_begin(session);
2496
c099397a
MD		 2497 WARN_ON_ONCE(!chan->header_type);
2498 ret = lttng_metadata_printf(session,
2499 "stream {\n"
2500 " id = %u;\n"
9115fbdc 2501 " event.header := %s;\n"
b9074a1b 2502 " packet.context := struct packet_context;\n",
c099397a
MD		 2503 chan->id,
2504 chan->header_type == 1 ? "struct event_header_compact" :
2505 "struct event_header_large");
2506 if (ret)
2507 goto end;
2508
b9074a1b
MD		 2509 if (chan->ctx) {
2510 ret = lttng_metadata_printf(session,
2511 " event.context := struct {\n");
2512 if (ret)
2513 goto end;
2514 }
a90917c3 2515 ret = _lttng_context_metadata_statedump(session, chan->ctx);
8070f5c0
MD		 2516 if (ret)
2517 goto end;
b9074a1b
MD		 2518 if (chan->ctx) {
2519 ret = lttng_metadata_printf(session,
2520 " };\n");
2521 if (ret)
2522 goto end;
2523 }
8070f5c0
MD		 2524
2525 ret = lttng_metadata_printf(session,
b9074a1b 2526 "};\n\n");
8070f5c0 2527
c099397a
MD		 2528 chan->metadata_dumped = 1;
2529end:
122c63cb 2530 lttng_metadata_end(session);
c099397a
MD		 2531 return ret;
2532}
2533
d83004aa
JD		 2534/*
2535 * Must be called with sessions_mutex held.
2536 */
9115fbdc 2537static
a90917c3 2538int _lttng_stream_packet_context_declare(struct lttng_session *session)
9115fbdc
MD		 2539{
2540 return lttng_metadata_printf(session,
2541 "struct packet_context {\n"
a3ccff4f
MD		 2542 " uint64_clock_monotonic_t timestamp_begin;\n"
2543 " uint64_clock_monotonic_t timestamp_end;\n"
576ca06a
MD		 2544 " uint64_t content_size;\n"
2545 " uint64_t packet_size;\n"
5b3cf4f9 2546 " uint64_t packet_seq_num;\n"
a9afe705 2547 " unsigned long events_discarded;\n"
9115fbdc 2548 " uint32_t cpu_id;\n"
c6dfdf6f 2549 "};\n\n"
9115fbdc
MD		 2550 );
2551}
2552
2553/*
2554 * Compact header:
2555 * id: range: 0 - 30.
2556 * id 31 is reserved to indicate an extended header.
2557 *
2558 * Large header:
2559 * id: range: 0 - 65534.
2560 * id 65535 is reserved to indicate an extended header.
d83004aa
JD		 2561 *
2562 * Must be called with sessions_mutex held.
9115fbdc
MD		 2563 */
2564static
a90917c3 2565int _lttng_event_header_declare(struct lttng_session *session)
9115fbdc
MD		 2566{
2567 return lttng_metadata_printf(session,
2568 "struct event_header_compact {\n"
2569 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2570 " variant <id> {\n"
2571 " struct {\n"
a3ccff4f 2572 " uint27_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 2573 " } compact;\n"
2574 " struct {\n"
2575 " uint32_t id;\n"
a3ccff4f 2576 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 2577 " } extended;\n"
2578 " } v;\n"
2579 "} align(%u);\n"
2580 "\n"
2581 "struct event_header_large {\n"
2582 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2583 " variant <id> {\n"
2584 " struct {\n"
a3ccff4f 2585 " uint32_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 2586 " } compact;\n"
2587 " struct {\n"
2588 " uint32_t id;\n"
a3ccff4f 2589 " uint64_clock_monotonic_t timestamp;\n"
9115fbdc
MD		 2590 " } extended;\n"
2591 " } v;\n"
2592 "} align(%u);\n\n",
a90917c3
MD		 2593 lttng_alignof(uint32_t) * CHAR_BIT,
2594 lttng_alignof(uint16_t) * CHAR_BIT
9115fbdc
MD		 2595 );
2596}
2597
a3ccff4f
MD		 2598 /*
2599 * Approximation of NTP time of day to clock monotonic correlation,
2600 * taken at start of trace.
2601 * Yes, this is only an approximation. Yes, we can (and will) do better
2602 * in future versions.
5283350b
MD		 2603 * This function may return a negative offset. It may happen if the
2604 * system sets the REALTIME clock to 0 after boot.
72dc372e
MJ		 2605 *
2606 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2607 * y2038 compliant.
a3ccff4f
MD		 2608 */
2609static
8967b2a3 2610int64_t measure_clock_offset(void)
a3ccff4f 2611{
dcb93448 2612 uint64_t monotonic_avg, monotonic[2], realtime;
2754583e 2613 uint64_t tcf = trace_clock_freq();
dcb93448 2614 int64_t offset;
a3ccff4f 2615 unsigned long flags;
72dc372e
MJ		 2616#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
2617 struct timespec64 rts = { 0, 0 };
2618#else
2619 struct timespec rts = { 0, 0 };
2620#endif
a3ccff4f
MD		 2621
2622 /* Disable interrupts to increase correlation precision. */
2623 local_irq_save(flags);
2624 monotonic[0] = trace_clock_read64();
72dc372e
MJ		 2625#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
2626 ktime_get_real_ts64(&rts);
2627#else
216b6baa 2628 getnstimeofday(&rts);
72dc372e 2629#endif
a3ccff4f
MD		 2630 monotonic[1] = trace_clock_read64();
2631 local_irq_restore(flags);
2632
dcb93448 2633 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2754583e
MD		 2634 realtime = (uint64_t) rts.tv_sec * tcf;
2635 if (tcf == NSEC_PER_SEC) {
2636 realtime += rts.tv_nsec;
2637 } else {
2638 uint64_t n = rts.tv_nsec * tcf;
2639
2640 do_div(n, NSEC_PER_SEC);
2641 realtime += n;
2642 }
dcb93448 2643 offset = (int64_t) realtime - monotonic_avg;
a3ccff4f
MD		 2644 return offset;
2645}
2646
3eb95be4
JR		 2647static
2648int print_escaped_ctf_string(struct lttng_session *session, const char *string)
2649{
ae457be2 2650 int ret = 0;
3eb95be4
JR		 2651 size_t i;
2652 char cur;
2653
2654 i = 0;
2655 cur = string[i];
2656 while (cur != '\0') {
2657 switch (cur) {
2658 case '\n':
2659 ret = lttng_metadata_printf(session, "%s", "\\n");
2660 break;
2661 case '\\':
2662 case '"':
2663 ret = lttng_metadata_printf(session, "%c", '\\');
2664 if (ret)
2665 goto error;
2666 /* We still print the current char */
1d00109f 2667 lttng_fallthrough;
3eb95be4
JR		 2668 default:
2669 ret = lttng_metadata_printf(session, "%c", cur);
2670 break;
2671 }
2672
2673 if (ret)
2674 goto error;
2675
2676 cur = string[++i];
2677 }
2678error:
2679 return ret;
2680}
2681
2682static
1c88f269
JR		 2683int print_metadata_escaped_field(struct lttng_session *session, const char *field,
2684 const char *field_value)
3eb95be4
JR		 2685{
2686 int ret;
2687
1c88f269 2688 ret = lttng_metadata_printf(session, " %s = \"", field);
3eb95be4
JR		 2689 if (ret)
2690 goto error;
2691
1c88f269 2692 ret = print_escaped_ctf_string(session, field_value);
3eb95be4
JR		 2693 if (ret)
2694 goto error;
2695
2696 ret = lttng_metadata_printf(session, "\";\n");
2697
2698error:
2699 return ret;
2700}
2701
c099397a
MD		 2702/*
2703 * Output metadata into this session's metadata buffers.
d83004aa 2704 * Must be called with sessions_mutex held.
c099397a
MD		 2705 */
2706static
a90917c3 2707int _lttng_session_metadata_statedump(struct lttng_session *session)
c099397a 2708{
30bdb6e4 2709 unsigned char *uuid_c = session->uuid.b;
a82c63f1 2710 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
c88f762e 2711 const char *product_uuid;
a90917c3
MD		 2712 struct lttng_channel *chan;
2713 struct lttng_event *event;
c099397a
MD		 2714 int ret = 0;
2715
57ccbfa6 2716 if (!LTTNG_READ_ONCE(session->active))
c099397a 2717 return 0;
122c63cb
MD		 2718
2719 lttng_metadata_begin(session);
2720
c099397a
MD		 2721 if (session->metadata_dumped)
2722 goto skip_session;
c099397a 2723
d793d5e1 2724 snprintf(uuid_s, sizeof(uuid_s),
30bdb6e4
MD		 2725 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2726 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
2727 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
2728 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
2729 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
d793d5e1
MD		 2730
2731 ret = lttng_metadata_printf(session,
9115fbdc
MD		 2732 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2733 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2734 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2735 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
a9afe705 2736 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
9115fbdc
MD		 2737 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2738 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
d793d5e1
MD		 2739 "\n"
2740 "trace {\n"
2741 " major = %u;\n"
2742 " minor = %u;\n"
30bdb6e4 2743 " uuid = \"%s\";\n"
d793d5e1
MD		 2744 " byte_order = %s;\n"
2745 " packet.header := struct {\n"
2746 " uint32_t magic;\n"
1ec3f75a 2747 " uint8_t uuid[16];\n"
d793d5e1 2748 " uint32_t stream_id;\n"
5594698f 2749 " uint64_t stream_instance_id;\n"
0eb25f58 2750 " };\n"
d793d5e1 2751 "};\n\n",
a90917c3
MD		 2752 lttng_alignof(uint8_t) * CHAR_BIT,
2753 lttng_alignof(uint16_t) * CHAR_BIT,
2754 lttng_alignof(uint32_t) * CHAR_BIT,
2755 lttng_alignof(uint64_t) * CHAR_BIT,
a9afe705
MD		 2756 sizeof(unsigned long) * CHAR_BIT,
2757 lttng_alignof(unsigned long) * CHAR_BIT,
c6c9e10f
MD		 2758 CTF_SPEC_MAJOR,
2759 CTF_SPEC_MINOR,
d793d5e1 2760 uuid_s,
5214fa50 2761#if __BYTE_ORDER == __BIG_ENDIAN
d793d5e1
MD		 2762 "be"
2763#else
2764 "le"
2765#endif
2766 );
2767 if (ret)
2768 goto end;
2769
99dc9597
MD		 2770 ret = lttng_metadata_printf(session,
2771 "env {\n"
a6058143 2772 " hostname = \"%s\";\n"
c6c9e10f 2773 " domain = \"kernel\";\n"
99dc9597 2774 " sysname = \"%s\";\n"
c6c9e10f
MD		 2775 " kernel_release = \"%s\";\n"
2776 " kernel_version = \"%s\";\n"
2777 " tracer_name = \"lttng-modules\";\n"
2778 " tracer_major = %d;\n"
2779 " tracer_minor = %d;\n"
2780 " tracer_patchlevel = %d;\n"
3eb95be4 2781 " trace_buffering_scheme = \"global\";\n",
3d0d43db 2782 current->nsproxy->uts_ns->name.nodename,
99dc9597
MD		 2783 utsname()->sysname,
2784 utsname()->release,
c6c9e10f
MD		 2785 utsname()->version,
2786 LTTNG_MODULES_MAJOR_VERSION,
2787 LTTNG_MODULES_MINOR_VERSION,
2788 LTTNG_MODULES_PATCHLEVEL_VERSION
99dc9597
MD		 2789 );
2790 if (ret)
2791 goto end;
2792
1c88f269
JR		 2793 ret = print_metadata_escaped_field(session, "trace_name", session->name);
2794 if (ret)
2795 goto end;
2796 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
2797 session->creation_time);
3eb95be4
JR		 2798 if (ret)
2799 goto end;
2800
c88f762e
GB		 2801 /* Add the product UUID to the 'env' section */
2802 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
2803 if (product_uuid) {
2804 ret = lttng_metadata_printf(session,
2805 " product_uuid = \"%s\";\n",
2806 product_uuid
2807 );
2808 if (ret)
2809 goto end;
2810 }
2811
2812 /* Close the 'env' section */
3eb95be4
JR		 2813 ret = lttng_metadata_printf(session, "};\n\n");
2814 if (ret)
2815 goto end;
2816
a3ccff4f
MD		 2817 ret = lttng_metadata_printf(session,
2818 "clock {\n"
2754583e
MD		 2819 " name = \"%s\";\n",
2820 trace_clock_name()
a82c63f1
MD		 2821 );
2822 if (ret)
2823 goto end;
2824
2825 if (!trace_clock_uuid(clock_uuid_s)) {
2826 ret = lttng_metadata_printf(session,
7c27cb17 2827 " uuid = \"%s\";\n",
a82c63f1
MD		 2828 clock_uuid_s
2829 );
2830 if (ret)
2831 goto end;
2832 }
2833
2834 ret = lttng_metadata_printf(session,
2754583e 2835 " description = \"%s\";\n"
a3ccff4f
MD		 2836 " freq = %llu; /* Frequency, in Hz */\n"
2837 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
8967b2a3 2838 " offset = %lld;\n"
a3ccff4f 2839 "};\n\n",
2754583e 2840 trace_clock_description(),
a3ccff4f 2841 (unsigned long long) trace_clock_freq(),
8967b2a3 2842 (long long) measure_clock_offset()
a3ccff4f
MD		 2843 );
2844 if (ret)
2845 goto end;
2846
2847 ret = lttng_metadata_printf(session,
2848 "typealias integer {\n"
2849 " size = 27; align = 1; signed = false;\n"
2754583e 2850 " map = clock.%s.value;\n"
a3ccff4f
MD		 2851 "} := uint27_clock_monotonic_t;\n"
2852 "\n"
2853 "typealias integer {\n"
2854 " size = 32; align = %u; signed = false;\n"
2754583e 2855 " map = clock.%s.value;\n"
a3ccff4f
MD		 2856 "} := uint32_clock_monotonic_t;\n"
2857 "\n"
2858 "typealias integer {\n"
2859 " size = 64; align = %u; signed = false;\n"
2754583e 2860 " map = clock.%s.value;\n"
a3ccff4f 2861 "} := uint64_clock_monotonic_t;\n\n",
2754583e 2862 trace_clock_name(),
a3ccff4f 2863 lttng_alignof(uint32_t) * CHAR_BIT,
2754583e
MD		 2864 trace_clock_name(),
2865 lttng_alignof(uint64_t) * CHAR_BIT,
2866 trace_clock_name()
a3ccff4f
MD		 2867 );
2868 if (ret)
2869 goto end;
2870
a90917c3 2871 ret = _lttng_stream_packet_context_declare(session);
9115fbdc
MD		 2872 if (ret)
2873 goto end;
2874
a90917c3 2875 ret = _lttng_event_header_declare(session);
9115fbdc
MD		 2876 if (ret)
2877 goto end;
2878
c099397a
MD		 2879skip_session:
2880 list_for_each_entry(chan, &session->chan, list) {
a90917c3 2881 ret = _lttng_channel_metadata_statedump(session, chan);
c099397a
MD		 2882 if (ret)
2883 goto end;
2884 }
2885
2886 list_for_each_entry(event, &session->events, list) {
a90917c3 2887 ret = _lttng_event_metadata_statedump(session, event->chan, event);
c099397a
MD		 2888 if (ret)
2889 goto end;
2890 }
2891 session->metadata_dumped = 1;
2892end:
122c63cb 2893 lttng_metadata_end(session);
c099397a
MD		 2894 return ret;
2895}
2896
c0e31d2e 2897/**
a90917c3 2898 * lttng_transport_register - LTT transport registration
c0e31d2e
MD		 2899 * @transport: transport structure
2900 *
2901 * Registers a transport which can be used as output to extract the data out of
2902 * LTTng. The module calling this registration function must ensure that no
2903 * trap-inducing code will be executed by the transport functions. E.g.
ea53823c 2904 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
c0e31d2e 2905 * is made visible to the transport function. This registration acts as a
ea53823c 2906 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
c0e31d2e
MD		 2907 * after its registration must it synchronize the TLBs.
2908 */
a90917c3 2909void lttng_transport_register(struct lttng_transport *transport)
c0e31d2e
MD		 2910{
2911 /*
2912 * Make sure no page fault can be triggered by the module about to be
2913 * registered. We deal with this here so we don't have to call
ea53823c 2914 * vmalloc_sync_mappings() in each module's init.
c0e31d2e 2915 */
ea53823c 2916 wrapper_vmalloc_sync_mappings();
c0e31d2e
MD		 2917
2918 mutex_lock(&sessions_mutex);
a90917c3 2919 list_add_tail(&transport->node, &lttng_transport_list);
c0e31d2e
MD		 2920 mutex_unlock(&sessions_mutex);
2921}
a90917c3 2922EXPORT_SYMBOL_GPL(lttng_transport_register);
c0e31d2e
MD		 2923
2924/**
a90917c3 2925 * lttng_transport_unregister - LTT transport unregistration
c0e31d2e
MD		 2926 * @transport: transport structure
2927 */
a90917c3 2928void lttng_transport_unregister(struct lttng_transport *transport)
c0e31d2e
MD		 2929{
2930 mutex_lock(&sessions_mutex);
2931 list_del(&transport->node);
2932 mutex_unlock(&sessions_mutex);
2933}
a90917c3 2934EXPORT_SYMBOL_GPL(lttng_transport_unregister);
c0e31d2e 2935
2d042821 2936#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
1e367326
MD		 2937
2938enum cpuhp_state lttng_hp_prepare;
2939enum cpuhp_state lttng_hp_online;
2940
2941static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
2942{
2943 struct lttng_cpuhp_node *lttng_node;
2944
2945 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2946 switch (lttng_node->component) {
2947 case LTTNG_RING_BUFFER_FRONTEND:
2948 return 0;
2949 case LTTNG_RING_BUFFER_BACKEND:
2950 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
2951 case LTTNG_RING_BUFFER_ITER:
2952 return 0;
2953 case LTTNG_CONTEXT_PERF_COUNTERS:
2954 return 0;
2955 default:
2956 return -EINVAL;
2957 }
2958}
2959
2960static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
2961{
2962 struct lttng_cpuhp_node *lttng_node;
2963
2964 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2965 switch (lttng_node->component) {
2966 case LTTNG_RING_BUFFER_FRONTEND:
2967 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
2968 case LTTNG_RING_BUFFER_BACKEND:
2969 return 0;
2970 case LTTNG_RING_BUFFER_ITER:
2971 return 0;
2972 case LTTNG_CONTEXT_PERF_COUNTERS:
2973 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
2974 default:
2975 return -EINVAL;
2976 }
2977}
2978
2979static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
2980{
2981 struct lttng_cpuhp_node *lttng_node;
2982
2983 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2984 switch (lttng_node->component) {
2985 case LTTNG_RING_BUFFER_FRONTEND:
2986 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
2987 case LTTNG_RING_BUFFER_BACKEND:
2988 return 0;
2989 case LTTNG_RING_BUFFER_ITER:
2990 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
2991 case LTTNG_CONTEXT_PERF_COUNTERS:
2992 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
2993 default:
2994 return -EINVAL;
2995 }
2996}
2997
2998static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
2999{
3000 struct lttng_cpuhp_node *lttng_node;
3001
3002 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3003 switch (lttng_node->component) {
3004 case LTTNG_RING_BUFFER_FRONTEND:
3005 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
3006 case LTTNG_RING_BUFFER_BACKEND:
3007 return 0;
3008 case LTTNG_RING_BUFFER_ITER:
3009 return 0;
3010 case LTTNG_CONTEXT_PERF_COUNTERS:
3011 return 0;
3012 default:
3013 return -EINVAL;
3014 }
3015}
3016
3017static int __init lttng_init_cpu_hotplug(void)
3018{
3019 int ret;
3020
3021 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
3022 lttng_hotplug_prepare,
3023 lttng_hotplug_dead);
3024 if (ret < 0) {
3025 return ret;
3026 }
3027 lttng_hp_prepare = ret;
3028 lttng_rb_set_hp_prepare(ret);
3029
3030 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
3031 lttng_hotplug_online,
3032 lttng_hotplug_offline);
3033 if (ret < 0) {
3034 cpuhp_remove_multi_state(lttng_hp_prepare);
3035 lttng_hp_prepare = 0;
3036 return ret;
3037 }
3038 lttng_hp_online = ret;
3039 lttng_rb_set_hp_online(ret);
3040
3041 return 0;
3042}
3043
3044static void __exit lttng_exit_cpu_hotplug(void)
3045{
3046 lttng_rb_set_hp_online(0);
3047 cpuhp_remove_multi_state(lttng_hp_online);
3048 lttng_rb_set_hp_prepare(0);
3049 cpuhp_remove_multi_state(lttng_hp_prepare);
3050}
3051
2d042821 3052#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 3053static int lttng_init_cpu_hotplug(void)
3054{
3055 return 0;
3056}
3057static void lttng_exit_cpu_hotplug(void)
3058{
3059}
2d042821 3060#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
1e367326
MD		 3061
3062
a90917c3 3063static int __init lttng_events_init(void)
4e3c1b9b 3064{
1c25284c
MD		 3065 int ret;
3066
453b2495
JD		 3067 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
3068 if (ret)
3069 return ret;
389d7070 3070 ret = wrapper_get_pfnblock_flags_mask_init();
36561775
MD		 3071 if (ret)
3072 return ret;
3073 ret = wrapper_get_pageblock_flags_mask_init();
114667d5
MD		 3074 if (ret)
3075 return ret;
3076 ret = lttng_probes_init();
389d7070
MD		 3077 if (ret)
3078 return ret;
07dfc1d0 3079 ret = lttng_context_init();
20591cf7
MD		 3080 if (ret)
3081 return ret;
07dfc1d0
MD		 3082 ret = lttng_tracepoint_init();
3083 if (ret)
3084 goto error_tp;
a90917c3 3085 event_cache = KMEM_CACHE(lttng_event, 0);
20591cf7
MD		 3086 if (!event_cache) {
3087 ret = -ENOMEM;
3088 goto error_kmem;
3089 }
80996790 3090 ret = lttng_abi_init();
02119ee5
MD		 3091 if (ret)
3092 goto error_abi;
0c956676
MD		 3093 ret = lttng_logger_init();
3094 if (ret)
3095 goto error_logger;
1e367326
MD		 3096 ret = lttng_init_cpu_hotplug();
3097 if (ret)
3098 goto error_hotplug;
101215b7 3099 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 3100 __stringify(LTTNG_MODULES_MAJOR_VERSION),
3101 __stringify(LTTNG_MODULES_MINOR_VERSION),
3102 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
3103 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 3104 LTTNG_VERSION_NAME,
3105#ifdef LTTNG_EXTRA_VERSION_GIT
3106 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
3107#else
3108 "",
3109#endif
3110#ifdef LTTNG_EXTRA_VERSION_NAME
3111 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3112#else
3113 "");
3114#endif
5e22c27b
MJ		 3115#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
3116 printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n");
3117#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4e3c1b9b 3118 return 0;
0c956676 3119
1e367326
MD		 3120error_hotplug:
3121 lttng_logger_exit();
0c956676
MD		 3122error_logger:
3123 lttng_abi_exit();
02119ee5 3124error_abi:
1c25284c 3125 kmem_cache_destroy(event_cache);
20591cf7
MD		 3126error_kmem:
3127 lttng_tracepoint_exit();
07dfc1d0
MD		 3128error_tp:
3129 lttng_context_exit();
101215b7 3130 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 3131 __stringify(LTTNG_MODULES_MAJOR_VERSION),
3132 __stringify(LTTNG_MODULES_MINOR_VERSION),
3133 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
3134 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 3135 LTTNG_VERSION_NAME,
3136#ifdef LTTNG_EXTRA_VERSION_GIT
3137 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
3138#else
3139 "",
3140#endif
3141#ifdef LTTNG_EXTRA_VERSION_NAME
3142 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3143#else
3144 "");
3145#endif
1c25284c 3146 return ret;
4e3c1b9b
MD		 3147}
3148
a90917c3 3149module_init(lttng_events_init);
11b5a3c2 3150
a90917c3 3151static void __exit lttng_events_exit(void)
4e3c1b9b 3152{
a90917c3 3153 struct lttng_session *session, *tmpsession;
92e94819 3154
1e367326 3155 lttng_exit_cpu_hotplug();
0c956676 3156 lttng_logger_exit();
80996790 3157 lttng_abi_exit();
92e94819 3158 list_for_each_entry_safe(session, tmpsession, &sessions, list)
a90917c3 3159 lttng_session_destroy(session);
11b5a3c2 3160 kmem_cache_destroy(event_cache);
20591cf7 3161 lttng_tracepoint_exit();
07dfc1d0 3162 lttng_context_exit();
101215b7 3163 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
489de24b
MJ		 3164 __stringify(LTTNG_MODULES_MAJOR_VERSION),
3165 __stringify(LTTNG_MODULES_MINOR_VERSION),
3166 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
3167 LTTNG_MODULES_EXTRAVERSION,
101215b7
MJ		 3168 LTTNG_VERSION_NAME,
3169#ifdef LTTNG_EXTRA_VERSION_GIT
3170 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
3171#else
3172 "",
3173#endif
3174#ifdef LTTNG_EXTRA_VERSION_NAME
3175 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3176#else
3177 "");
3178#endif
4e3c1b9b 3179}
92e94819 3180
a90917c3 3181module_exit(lttng_events_exit);
11b5a3c2 3182
101215b7
MJ		 3183#include "extra_version/patches.i"
3184#ifdef LTTNG_EXTRA_VERSION_GIT
3185MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
3186#endif
3187#ifdef LTTNG_EXTRA_VERSION_NAME
3188MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
3189#endif
92e94819
MD		 3190MODULE_LICENSE("GPL and additional rights");
3191MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 3192MODULE_DESCRIPTION("LTTng tracer");
9a9973ef
MD		 3193MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
3194 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
309370e2
MD		 3195 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
3196 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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