4 * Holds LTTng per-session event registry.
6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
25 * overrides a function with a define.
27 #include "wrapper/page_alloc.h"
29 #include <linux/module.h>
30 #include <linux/mutex.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/jiffies.h>
34 #include <linux/utsname.h>
35 #include <linux/err.h>
36 #include <linux/seq_file.h>
37 #include <linux/file.h>
38 #include <linux/anon_inodes.h>
39 #include <wrapper/file.h>
40 #include <linux/jhash.h>
41 #include <linux/uaccess.h>
42 #include <linux/vmalloc.h>
44 #include <wrapper/uuid.h>
45 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
46 #include <wrapper/random.h>
47 #include <wrapper/tracepoint.h>
48 #include <wrapper/list.h>
49 #include <lttng-kernel-version.h>
50 #include <lttng-events.h>
51 #include <lttng-tracer.h>
52 #include <lttng-abi-old.h>
53 #include <lttng-endian.h>
54 #include <wrapper/vzalloc.h>
55 #include <wrapper/ringbuffer/backend.h>
56 #include <wrapper/ringbuffer/frontend.h>
58 #define METADATA_CACHE_DEFAULT_SIZE 4096
60 static LIST_HEAD(sessions
);
61 static LIST_HEAD(lttng_transport_list
);
63 * Protect the sessions and metadata caches.
65 static DEFINE_MUTEX(sessions_mutex
);
66 static struct kmem_cache
*event_cache
;
68 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
69 static void lttng_session_sync_enablers(struct lttng_session
*session
);
70 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
72 static void _lttng_event_destroy(struct lttng_event
*event
);
73 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
74 static int _lttng_event_unregister(struct lttng_event
*event
);
76 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
77 struct lttng_channel
*chan
,
78 struct lttng_event
*event
);
80 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
82 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
84 int _lttng_field_statedump(struct lttng_session
*session
,
85 const struct lttng_event_field
*field
,
88 void synchronize_trace(void)
90 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
96 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
97 #ifdef CONFIG_PREEMPT_RT_FULL
100 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
101 #ifdef CONFIG_PREEMPT_RT
104 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
107 void lttng_lock_sessions(void)
109 mutex_lock(&sessions_mutex
);
112 void lttng_unlock_sessions(void)
114 mutex_unlock(&sessions_mutex
);
118 * Called with sessions lock held.
120 int lttng_session_active(void)
122 struct lttng_session
*iter
;
124 list_for_each_entry(iter
, &sessions
, list
) {
131 struct lttng_session
*lttng_session_create(void)
133 struct lttng_session
*session
;
134 struct lttng_metadata_cache
*metadata_cache
;
137 mutex_lock(&sessions_mutex
);
138 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
141 INIT_LIST_HEAD(&session
->chan
);
142 INIT_LIST_HEAD(&session
->events
);
143 uuid_le_gen(&session
->uuid
);
145 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
148 goto err_free_session
;
149 metadata_cache
->data
= lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
150 if (!metadata_cache
->data
)
152 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
153 kref_init(&metadata_cache
->refcount
);
154 mutex_init(&metadata_cache
->lock
);
155 session
->metadata_cache
= metadata_cache
;
156 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
157 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
158 sizeof(metadata_cache
->uuid
));
159 INIT_LIST_HEAD(&session
->enablers_head
);
160 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
161 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
162 list_add(&session
->list
, &sessions
);
163 mutex_unlock(&sessions_mutex
);
167 kfree(metadata_cache
);
169 lttng_kvfree(session
);
171 mutex_unlock(&sessions_mutex
);
175 void metadata_cache_destroy(struct kref
*kref
)
177 struct lttng_metadata_cache
*cache
=
178 container_of(kref
, struct lttng_metadata_cache
, refcount
);
183 void lttng_session_destroy(struct lttng_session
*session
)
185 struct lttng_channel
*chan
, *tmpchan
;
186 struct lttng_event
*event
, *tmpevent
;
187 struct lttng_metadata_stream
*metadata_stream
;
188 struct lttng_enabler
*enabler
, *tmpenabler
;
191 mutex_lock(&sessions_mutex
);
192 WRITE_ONCE(session
->active
, 0);
193 list_for_each_entry(chan
, &session
->chan
, list
) {
194 ret
= lttng_syscalls_unregister(chan
);
197 list_for_each_entry(event
, &session
->events
, list
) {
198 ret
= _lttng_event_unregister(event
);
201 synchronize_trace(); /* Wait for in-flight events to complete */
202 list_for_each_entry_safe(enabler
, tmpenabler
,
203 &session
->enablers_head
, node
)
204 lttng_enabler_destroy(enabler
);
205 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
206 _lttng_event_destroy(event
);
207 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
208 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
209 _lttng_channel_destroy(chan
);
211 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
212 _lttng_metadata_channel_hangup(metadata_stream
);
213 if (session
->pid_tracker
)
214 lttng_pid_tracker_destroy(session
->pid_tracker
);
215 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
216 list_del(&session
->list
);
217 mutex_unlock(&sessions_mutex
);
218 lttng_kvfree(session
);
221 int lttng_session_statedump(struct lttng_session
*session
)
225 mutex_lock(&sessions_mutex
);
226 ret
= lttng_statedump_start(session
);
227 mutex_unlock(&sessions_mutex
);
231 int lttng_session_enable(struct lttng_session
*session
)
234 struct lttng_channel
*chan
;
236 mutex_lock(&sessions_mutex
);
237 if (session
->active
) {
242 /* Set transient enabler state to "enabled" */
246 * Snapshot the number of events per channel to know the type of header
249 list_for_each_entry(chan
, &session
->chan
, list
) {
250 if (chan
->header_type
)
251 continue; /* don't change it if session stop/restart */
252 if (chan
->free_event_id
< 31)
253 chan
->header_type
= 1; /* compact */
255 chan
->header_type
= 2; /* large */
258 /* We need to sync enablers with session before activation. */
259 lttng_session_sync_enablers(session
);
261 /* Clear each stream's quiescent state. */
262 list_for_each_entry(chan
, &session
->chan
, list
) {
263 if (chan
->channel_type
!= METADATA_CHANNEL
)
264 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
267 WRITE_ONCE(session
->active
, 1);
268 WRITE_ONCE(session
->been_active
, 1);
269 ret
= _lttng_session_metadata_statedump(session
);
271 WRITE_ONCE(session
->active
, 0);
274 ret
= lttng_statedump_start(session
);
276 WRITE_ONCE(session
->active
, 0);
278 mutex_unlock(&sessions_mutex
);
282 int lttng_session_disable(struct lttng_session
*session
)
285 struct lttng_channel
*chan
;
287 mutex_lock(&sessions_mutex
);
288 if (!session
->active
) {
292 WRITE_ONCE(session
->active
, 0);
294 /* Set transient enabler state to "disabled" */
296 lttng_session_sync_enablers(session
);
298 /* Set each stream's quiescent state. */
299 list_for_each_entry(chan
, &session
->chan
, list
) {
300 if (chan
->channel_type
!= METADATA_CHANNEL
)
301 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
304 mutex_unlock(&sessions_mutex
);
308 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
311 struct lttng_channel
*chan
;
312 struct lttng_event
*event
;
313 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
314 struct lttng_metadata_stream
*stream
;
316 mutex_lock(&sessions_mutex
);
317 if (!session
->active
) {
322 mutex_lock(&cache
->lock
);
323 memset(cache
->data
, 0, cache
->cache_alloc
);
324 cache
->metadata_written
= 0;
326 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
327 stream
->metadata_out
= 0;
328 stream
->metadata_in
= 0;
330 mutex_unlock(&cache
->lock
);
332 session
->metadata_dumped
= 0;
333 list_for_each_entry(chan
, &session
->chan
, list
) {
334 chan
->metadata_dumped
= 0;
337 list_for_each_entry(event
, &session
->events
, list
) {
338 event
->metadata_dumped
= 0;
341 ret
= _lttng_session_metadata_statedump(session
);
344 mutex_unlock(&sessions_mutex
);
350 int lttng_channel_enable(struct lttng_channel
*channel
)
354 mutex_lock(&sessions_mutex
);
355 if (channel
->channel_type
== METADATA_CHANNEL
) {
359 if (channel
->enabled
) {
363 /* Set transient enabler state to "enabled" */
365 lttng_session_sync_enablers(channel
->session
);
366 /* Set atomically the state to "enabled" */
367 WRITE_ONCE(channel
->enabled
, 1);
369 mutex_unlock(&sessions_mutex
);
373 int lttng_channel_disable(struct lttng_channel
*channel
)
377 mutex_lock(&sessions_mutex
);
378 if (channel
->channel_type
== METADATA_CHANNEL
) {
382 if (!channel
->enabled
) {
386 /* Set atomically the state to "disabled" */
387 WRITE_ONCE(channel
->enabled
, 0);
388 /* Set transient enabler state to "enabled" */
390 lttng_session_sync_enablers(channel
->session
);
392 mutex_unlock(&sessions_mutex
);
396 int lttng_event_enable(struct lttng_event
*event
)
400 mutex_lock(&sessions_mutex
);
401 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
405 if (event
->enabled
) {
409 switch (event
->instrumentation
) {
410 case LTTNG_KERNEL_TRACEPOINT
:
411 case LTTNG_KERNEL_SYSCALL
:
414 case LTTNG_KERNEL_KPROBE
:
415 case LTTNG_KERNEL_FUNCTION
:
416 case LTTNG_KERNEL_NOOP
:
417 WRITE_ONCE(event
->enabled
, 1);
419 case LTTNG_KERNEL_KRETPROBE
:
420 ret
= lttng_kretprobes_event_enable_state(event
, 1);
427 mutex_unlock(&sessions_mutex
);
431 int lttng_event_disable(struct lttng_event
*event
)
435 mutex_lock(&sessions_mutex
);
436 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
440 if (!event
->enabled
) {
444 switch (event
->instrumentation
) {
445 case LTTNG_KERNEL_TRACEPOINT
:
446 case LTTNG_KERNEL_SYSCALL
:
449 case LTTNG_KERNEL_KPROBE
:
450 case LTTNG_KERNEL_FUNCTION
:
451 case LTTNG_KERNEL_NOOP
:
452 WRITE_ONCE(event
->enabled
, 0);
454 case LTTNG_KERNEL_KRETPROBE
:
455 ret
= lttng_kretprobes_event_enable_state(event
, 0);
462 mutex_unlock(&sessions_mutex
);
466 static struct lttng_transport
*lttng_transport_find(const char *name
)
468 struct lttng_transport
*transport
;
470 list_for_each_entry(transport
, <tng_transport_list
, node
) {
471 if (!strcmp(transport
->name
, name
))
477 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
478 const char *transport_name
,
480 size_t subbuf_size
, size_t num_subbuf
,
481 unsigned int switch_timer_interval
,
482 unsigned int read_timer_interval
,
483 enum channel_type channel_type
)
485 struct lttng_channel
*chan
;
486 struct lttng_transport
*transport
= NULL
;
488 mutex_lock(&sessions_mutex
);
489 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
490 goto active
; /* Refuse to add channel to active session */
491 transport
= lttng_transport_find(transport_name
);
493 printk(KERN_WARNING
"LTTng transport %s not found\n",
497 if (!try_module_get(transport
->owner
)) {
498 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
501 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
504 chan
->session
= session
;
505 chan
->id
= session
->free_chan_id
++;
506 chan
->ops
= &transport
->ops
;
508 * Note: the channel creation op already writes into the packet
509 * headers. Therefore the "chan" information used as input
510 * should be already accessible.
512 chan
->chan
= transport
->ops
.channel_create(transport_name
,
513 chan
, buf_addr
, subbuf_size
, num_subbuf
,
514 switch_timer_interval
, read_timer_interval
);
519 chan
->transport
= transport
;
520 chan
->channel_type
= channel_type
;
521 list_add(&chan
->list
, &session
->chan
);
522 mutex_unlock(&sessions_mutex
);
529 module_put(transport
->owner
);
532 mutex_unlock(&sessions_mutex
);
537 * Only used internally at session destruction for per-cpu channels, and
538 * when metadata channel is released.
539 * Needs to be called with sessions mutex held.
542 void _lttng_channel_destroy(struct lttng_channel
*chan
)
544 chan
->ops
->channel_destroy(chan
->chan
);
545 module_put(chan
->transport
->owner
);
546 list_del(&chan
->list
);
547 lttng_destroy_context(chan
->ctx
);
551 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
553 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
555 /* Protect the metadata cache with the sessions_mutex. */
556 mutex_lock(&sessions_mutex
);
557 _lttng_channel_destroy(chan
);
558 mutex_unlock(&sessions_mutex
);
560 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
563 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
565 stream
->finalized
= 1;
566 wake_up_interruptible(&stream
->read_wait
);
570 * Supports event creation while tracing session is active.
571 * Needs to be called with sessions mutex held.
573 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
574 struct lttng_kernel_event
*event_param
,
576 const struct lttng_event_desc
*event_desc
,
577 enum lttng_kernel_instrumentation itype
)
579 struct lttng_session
*session
= chan
->session
;
580 struct lttng_event
*event
;
581 const char *event_name
;
582 struct hlist_head
*head
;
587 if (chan
->free_event_id
== -1U) {
593 case LTTNG_KERNEL_TRACEPOINT
:
594 event_name
= event_desc
->name
;
596 case LTTNG_KERNEL_KPROBE
:
597 case LTTNG_KERNEL_KRETPROBE
:
598 case LTTNG_KERNEL_FUNCTION
:
599 case LTTNG_KERNEL_NOOP
:
600 case LTTNG_KERNEL_SYSCALL
:
601 event_name
= event_param
->name
;
608 name_len
= strlen(event_name
);
609 hash
= jhash(event_name
, name_len
, 0);
610 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
611 lttng_hlist_for_each_entry(event
, head
, hlist
) {
612 WARN_ON_ONCE(!event
->desc
);
613 if (!strncmp(event
->desc
->name
, event_name
,
614 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
615 && chan
== event
->chan
) {
621 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
627 event
->filter
= filter
;
628 event
->id
= chan
->free_event_id
++;
629 event
->instrumentation
= itype
;
630 event
->evtype
= LTTNG_TYPE_EVENT
;
631 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
632 INIT_LIST_HEAD(&event
->enablers_ref_head
);
635 case LTTNG_KERNEL_TRACEPOINT
:
636 /* Event will be enabled by enabler sync. */
638 event
->registered
= 0;
639 event
->desc
= lttng_event_get(event_name
);
644 /* Populate lttng_event structure before event registration. */
647 case LTTNG_KERNEL_KPROBE
:
649 * Needs to be explicitly enabled after creation, since
650 * we may want to apply filters.
653 event
->registered
= 1;
655 * Populate lttng_event structure before event
659 ret
= lttng_kprobes_register(event_name
,
660 event_param
->u
.kprobe
.symbol_name
,
661 event_param
->u
.kprobe
.offset
,
662 event_param
->u
.kprobe
.addr
,
668 ret
= try_module_get(event
->desc
->owner
);
671 case LTTNG_KERNEL_KRETPROBE
:
673 struct lttng_event
*event_return
;
675 /* kretprobe defines 2 events */
677 * Needs to be explicitly enabled after creation, since
678 * we may want to apply filters.
681 event
->registered
= 1;
683 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
688 event_return
->chan
= chan
;
689 event_return
->filter
= filter
;
690 event_return
->id
= chan
->free_event_id
++;
691 event_return
->enabled
= 0;
692 event_return
->registered
= 1;
693 event_return
->instrumentation
= itype
;
695 * Populate lttng_event structure before kretprobe registration.
698 ret
= lttng_kretprobes_register(event_name
,
699 event_param
->u
.kretprobe
.symbol_name
,
700 event_param
->u
.kretprobe
.offset
,
701 event_param
->u
.kretprobe
.addr
,
702 event
, event_return
);
704 kmem_cache_free(event_cache
, event_return
);
708 /* Take 2 refs on the module: one per event. */
709 ret
= try_module_get(event
->desc
->owner
);
711 ret
= try_module_get(event
->desc
->owner
);
713 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
715 WARN_ON_ONCE(ret
> 0);
717 kmem_cache_free(event_cache
, event_return
);
718 module_put(event
->desc
->owner
);
719 module_put(event
->desc
->owner
);
720 goto statedump_error
;
722 list_add(&event_return
->list
, &chan
->session
->events
);
725 case LTTNG_KERNEL_FUNCTION
:
727 * Needs to be explicitly enabled after creation, since
728 * we may want to apply filters.
731 event
->registered
= 1;
733 * Populate lttng_event structure before event
737 ret
= lttng_ftrace_register(event_name
,
738 event_param
->u
.ftrace
.symbol_name
,
743 ret
= try_module_get(event
->desc
->owner
);
746 case LTTNG_KERNEL_NOOP
:
747 case LTTNG_KERNEL_SYSCALL
:
749 * Needs to be explicitly enabled after creation, since
750 * we may want to apply filters.
753 event
->registered
= 0;
754 event
->desc
= event_desc
;
765 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
766 WARN_ON_ONCE(ret
> 0);
768 goto statedump_error
;
770 hlist_add_head(&event
->hlist
, head
);
771 list_add(&event
->list
, &chan
->session
->events
);
775 /* If a statedump error occurs, events will not be readable. */
777 kmem_cache_free(event_cache
, event
);
785 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
786 struct lttng_kernel_event
*event_param
,
788 const struct lttng_event_desc
*event_desc
,
789 enum lttng_kernel_instrumentation itype
)
791 struct lttng_event
*event
;
793 mutex_lock(&sessions_mutex
);
794 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
796 mutex_unlock(&sessions_mutex
);
800 /* Only used for tracepoints for now. */
802 void register_event(struct lttng_event
*event
)
804 const struct lttng_event_desc
*desc
;
807 if (event
->registered
)
811 switch (event
->instrumentation
) {
812 case LTTNG_KERNEL_TRACEPOINT
:
813 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
814 desc
->probe_callback
,
817 case LTTNG_KERNEL_SYSCALL
:
818 ret
= lttng_syscall_filter_enable(event
->chan
,
821 case LTTNG_KERNEL_KPROBE
:
822 case LTTNG_KERNEL_KRETPROBE
:
823 case LTTNG_KERNEL_FUNCTION
:
824 case LTTNG_KERNEL_NOOP
:
831 event
->registered
= 1;
835 * Only used internally at session destruction.
837 int _lttng_event_unregister(struct lttng_event
*event
)
839 const struct lttng_event_desc
*desc
;
842 if (!event
->registered
)
846 switch (event
->instrumentation
) {
847 case LTTNG_KERNEL_TRACEPOINT
:
848 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
849 event
->desc
->probe_callback
,
852 case LTTNG_KERNEL_KPROBE
:
853 lttng_kprobes_unregister(event
);
856 case LTTNG_KERNEL_KRETPROBE
:
857 lttng_kretprobes_unregister(event
);
860 case LTTNG_KERNEL_FUNCTION
:
861 lttng_ftrace_unregister(event
);
864 case LTTNG_KERNEL_SYSCALL
:
865 ret
= lttng_syscall_filter_disable(event
->chan
,
868 case LTTNG_KERNEL_NOOP
:
875 event
->registered
= 0;
880 * Only used internally at session destruction.
883 void _lttng_event_destroy(struct lttng_event
*event
)
885 switch (event
->instrumentation
) {
886 case LTTNG_KERNEL_TRACEPOINT
:
887 lttng_event_put(event
->desc
);
889 case LTTNG_KERNEL_KPROBE
:
890 module_put(event
->desc
->owner
);
891 lttng_kprobes_destroy_private(event
);
893 case LTTNG_KERNEL_KRETPROBE
:
894 module_put(event
->desc
->owner
);
895 lttng_kretprobes_destroy_private(event
);
897 case LTTNG_KERNEL_FUNCTION
:
898 module_put(event
->desc
->owner
);
899 lttng_ftrace_destroy_private(event
);
901 case LTTNG_KERNEL_NOOP
:
902 case LTTNG_KERNEL_SYSCALL
:
907 list_del(&event
->list
);
908 lttng_destroy_context(event
->ctx
);
909 kmem_cache_free(event_cache
, event
);
912 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
918 mutex_lock(&sessions_mutex
);
920 /* track all pids: destroy tracker. */
921 if (session
->pid_tracker
) {
922 struct lttng_pid_tracker
*lpf
;
924 lpf
= session
->pid_tracker
;
925 rcu_assign_pointer(session
->pid_tracker
, NULL
);
927 lttng_pid_tracker_destroy(lpf
);
931 if (!session
->pid_tracker
) {
932 struct lttng_pid_tracker
*lpf
;
934 lpf
= lttng_pid_tracker_create();
939 ret
= lttng_pid_tracker_add(lpf
, pid
);
940 rcu_assign_pointer(session
->pid_tracker
, lpf
);
942 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
946 mutex_unlock(&sessions_mutex
);
950 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
956 mutex_lock(&sessions_mutex
);
958 /* untrack all pids: replace by empty tracker. */
959 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
960 struct lttng_pid_tracker
*lpf
;
962 lpf
= lttng_pid_tracker_create();
967 rcu_assign_pointer(session
->pid_tracker
, lpf
);
970 lttng_pid_tracker_destroy(old_lpf
);
973 if (!session
->pid_tracker
) {
977 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
980 mutex_unlock(&sessions_mutex
);
985 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
987 struct lttng_session
*session
= m
->private;
988 struct lttng_pid_tracker
*lpf
;
989 struct lttng_pid_hash_node
*e
;
992 mutex_lock(&sessions_mutex
);
993 lpf
= session
->pid_tracker
;
995 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
996 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
998 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1004 /* PID tracker disabled. */
1005 if (iter
>= *pos
&& iter
== 0) {
1006 return session
; /* empty tracker */
1014 /* Called with sessions_mutex held. */
1016 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1018 struct lttng_session
*session
= m
->private;
1019 struct lttng_pid_tracker
*lpf
;
1020 struct lttng_pid_hash_node
*e
;
1024 lpf
= session
->pid_tracker
;
1026 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1027 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1029 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1030 if (iter
++ >= *ppos
)
1035 /* PID tracker disabled. */
1036 if (iter
>= *ppos
&& iter
== 0)
1037 return session
; /* empty tracker */
1046 void pid_list_stop(struct seq_file
*m
, void *p
)
1048 mutex_unlock(&sessions_mutex
);
1052 int pid_list_show(struct seq_file
*m
, void *p
)
1056 if (p
== m
->private) {
1057 /* Tracker disabled. */
1060 const struct lttng_pid_hash_node
*e
= p
;
1062 pid
= lttng_pid_tracker_get_node_pid(e
);
1064 seq_printf(m
, "process { pid = %d; };\n", pid
);
1069 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1070 .start
= pid_list_start
,
1071 .next
= pid_list_next
,
1072 .stop
= pid_list_stop
,
1073 .show
= pid_list_show
,
1077 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1079 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1083 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1085 struct seq_file
*m
= file
->private_data
;
1086 struct lttng_session
*session
= m
->private;
1089 WARN_ON_ONCE(!session
);
1090 ret
= seq_release(inode
, file
);
1091 if (!ret
&& session
)
1092 fput(session
->file
);
1096 const struct file_operations lttng_tracker_pids_list_fops
= {
1097 .owner
= THIS_MODULE
,
1098 .open
= lttng_tracker_pids_list_open
,
1100 .llseek
= seq_lseek
,
1101 .release
= lttng_tracker_pids_list_release
,
1104 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1106 struct file
*tracker_pids_list_file
;
1110 file_fd
= lttng_get_unused_fd();
1116 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1117 <tng_tracker_pids_list_fops
,
1119 if (IS_ERR(tracker_pids_list_file
)) {
1120 ret
= PTR_ERR(tracker_pids_list_file
);
1123 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1125 goto refcount_error
;
1127 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1130 m
= tracker_pids_list_file
->private_data
;
1131 m
->private = session
;
1132 fd_install(file_fd
, tracker_pids_list_file
);
1137 atomic_long_dec(&session
->file
->f_count
);
1139 fput(tracker_pids_list_file
);
1141 put_unused_fd(file_fd
);
1147 * Enabler management.
1150 int lttng_match_enabler_wildcard(const char *desc_name
,
1153 /* Compare excluding final '*' */
1154 if (strncmp(desc_name
, name
, strlen(name
) - 1))
1160 int lttng_match_enabler_name(const char *desc_name
,
1163 if (strcmp(desc_name
, name
))
1169 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1170 struct lttng_enabler
*enabler
)
1172 const char *desc_name
, *enabler_name
;
1174 enabler_name
= enabler
->event_param
.name
;
1175 switch (enabler
->event_param
.instrumentation
) {
1176 case LTTNG_KERNEL_TRACEPOINT
:
1177 desc_name
= desc
->name
;
1179 case LTTNG_KERNEL_SYSCALL
:
1180 desc_name
= desc
->name
;
1181 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1182 desc_name
+= strlen("compat_");
1183 if (!strncmp(desc_name
, "syscall_exit_",
1184 strlen("syscall_exit_"))) {
1185 desc_name
+= strlen("syscall_exit_");
1186 } else if (!strncmp(desc_name
, "syscall_entry_",
1187 strlen("syscall_entry_"))) {
1188 desc_name
+= strlen("syscall_entry_");
1198 switch (enabler
->type
) {
1199 case LTTNG_ENABLER_WILDCARD
:
1200 return lttng_match_enabler_wildcard(desc_name
, enabler_name
);
1201 case LTTNG_ENABLER_NAME
:
1202 return lttng_match_enabler_name(desc_name
, enabler_name
);
1209 int lttng_event_match_enabler(struct lttng_event
*event
,
1210 struct lttng_enabler
*enabler
)
1212 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1214 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1215 && event
->chan
== enabler
->chan
)
1222 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1223 struct lttng_enabler
*enabler
)
1225 struct lttng_enabler_ref
*enabler_ref
;
1227 list_for_each_entry(enabler_ref
,
1228 &event
->enablers_ref_head
, node
) {
1229 if (enabler_ref
->ref
== enabler
)
1236 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1238 struct lttng_session
*session
= enabler
->chan
->session
;
1239 struct lttng_probe_desc
*probe_desc
;
1240 const struct lttng_event_desc
*desc
;
1242 struct list_head
*probe_list
;
1244 probe_list
= lttng_get_probe_list_head();
1246 * For each probe event, if we find that a probe event matches
1247 * our enabler, create an associated lttng_event if not
1250 list_for_each_entry(probe_desc
, probe_list
, head
) {
1251 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1253 struct hlist_head
*head
;
1254 const char *event_name
;
1257 struct lttng_event
*event
;
1259 desc
= probe_desc
->event_desc
[i
];
1260 if (!lttng_desc_match_enabler(desc
, enabler
))
1262 event_name
= desc
->name
;
1263 name_len
= strlen(event_name
);
1266 * Check if already created.
1268 hash
= jhash(event_name
, name_len
, 0);
1269 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1270 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1271 if (event
->desc
== desc
1272 && event
->chan
== enabler
->chan
)
1279 * We need to create an event for this
1282 event
= _lttng_event_create(enabler
->chan
,
1284 LTTNG_KERNEL_TRACEPOINT
);
1286 printk(KERN_INFO
"Unable to create event %s\n",
1287 probe_desc
->event_desc
[i
]->name
);
1294 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1298 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1303 * Create struct lttng_event if it is missing and present in the list of
1304 * tracepoint probes.
1305 * Should be called with sessions mutex held.
1308 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1310 switch (enabler
->event_param
.instrumentation
) {
1311 case LTTNG_KERNEL_TRACEPOINT
:
1312 lttng_create_tracepoint_if_missing(enabler
);
1314 case LTTNG_KERNEL_SYSCALL
:
1315 lttng_create_syscall_if_missing(enabler
);
1324 * Create events associated with an enabler (if not already present),
1325 * and add backward reference from the event to the enabler.
1326 * Should be called with sessions mutex held.
1329 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1331 struct lttng_session
*session
= enabler
->chan
->session
;
1332 struct lttng_event
*event
;
1334 /* First ensure that probe events are created for this enabler. */
1335 lttng_create_event_if_missing(enabler
);
1337 /* For each event matching enabler in session event list. */
1338 list_for_each_entry(event
, &session
->events
, list
) {
1339 struct lttng_enabler_ref
*enabler_ref
;
1341 if (!lttng_event_match_enabler(event
, enabler
))
1343 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1346 * If no backward ref, create it.
1347 * Add backward ref from event to enabler.
1349 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1352 enabler_ref
->ref
= enabler
;
1353 list_add(&enabler_ref
->node
,
1354 &event
->enablers_ref_head
);
1358 * Link filter bytecodes if not linked yet.
1360 lttng_enabler_event_link_bytecode(event
, enabler
);
1362 /* TODO: merge event context. */
1368 * Called at module load: connect the probe on all enablers matching
1370 * Called with sessions lock held.
1372 int lttng_fix_pending_events(void)
1374 struct lttng_session
*session
;
1376 list_for_each_entry(session
, &sessions
, list
)
1377 lttng_session_lazy_sync_enablers(session
);
1381 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1382 struct lttng_kernel_event
*event_param
,
1383 struct lttng_channel
*chan
)
1385 struct lttng_enabler
*enabler
;
1387 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1390 enabler
->type
= type
;
1391 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1392 memcpy(&enabler
->event_param
, event_param
,
1393 sizeof(enabler
->event_param
));
1394 enabler
->chan
= chan
;
1396 enabler
->enabled
= 0;
1397 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1398 mutex_lock(&sessions_mutex
);
1399 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1400 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1401 mutex_unlock(&sessions_mutex
);
1405 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1407 mutex_lock(&sessions_mutex
);
1408 enabler
->enabled
= 1;
1409 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1410 mutex_unlock(&sessions_mutex
);
1414 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1416 mutex_lock(&sessions_mutex
);
1417 enabler
->enabled
= 0;
1418 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1419 mutex_unlock(&sessions_mutex
);
1423 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1424 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1426 struct lttng_filter_bytecode_node
*bytecode_node
;
1427 uint32_t bytecode_len
;
1430 ret
= get_user(bytecode_len
, &bytecode
->len
);
1433 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1437 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1438 sizeof(*bytecode
) + bytecode_len
);
1441 bytecode_node
->enabler
= enabler
;
1442 /* Enforce length based on allocated size */
1443 bytecode_node
->bc
.len
= bytecode_len
;
1444 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1445 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1449 kfree(bytecode_node
);
1453 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1454 struct lttng_kernel_context
*context_param
)
1460 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1462 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1464 /* Destroy filter bytecode */
1465 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1466 &enabler
->filter_bytecode_head
, node
) {
1470 /* Destroy contexts */
1471 lttng_destroy_context(enabler
->ctx
);
1473 list_del(&enabler
->node
);
1478 * lttng_session_sync_enablers should be called just before starting a
1480 * Should be called with sessions mutex held.
1483 void lttng_session_sync_enablers(struct lttng_session
*session
)
1485 struct lttng_enabler
*enabler
;
1486 struct lttng_event
*event
;
1488 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1489 lttng_enabler_ref_events(enabler
);
1491 * For each event, if at least one of its enablers is enabled,
1492 * and its channel and session transient states are enabled, we
1493 * enable the event, else we disable it.
1495 list_for_each_entry(event
, &session
->events
, list
) {
1496 struct lttng_enabler_ref
*enabler_ref
;
1497 struct lttng_bytecode_runtime
*runtime
;
1498 int enabled
= 0, has_enablers_without_bytecode
= 0;
1500 switch (event
->instrumentation
) {
1501 case LTTNG_KERNEL_TRACEPOINT
:
1502 case LTTNG_KERNEL_SYSCALL
:
1504 list_for_each_entry(enabler_ref
,
1505 &event
->enablers_ref_head
, node
) {
1506 if (enabler_ref
->ref
->enabled
) {
1513 /* Not handled with lazy sync. */
1517 * Enabled state is based on union of enablers, with
1518 * intesection of session and channel transient enable
1521 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1523 WRITE_ONCE(event
->enabled
, enabled
);
1525 * Sync tracepoint registration with event enabled
1529 register_event(event
);
1531 _lttng_event_unregister(event
);
1534 /* Check if has enablers without bytecode enabled */
1535 list_for_each_entry(enabler_ref
,
1536 &event
->enablers_ref_head
, node
) {
1537 if (enabler_ref
->ref
->enabled
1538 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1539 has_enablers_without_bytecode
= 1;
1543 event
->has_enablers_without_bytecode
=
1544 has_enablers_without_bytecode
;
1546 /* Enable filters */
1547 list_for_each_entry(runtime
,
1548 &event
->bytecode_runtime_head
, node
)
1549 lttng_filter_sync_state(runtime
);
1554 * Apply enablers to session events, adding events to session if need
1555 * be. It is required after each modification applied to an active
1556 * session, and right before session "start".
1557 * "lazy" sync means we only sync if required.
1558 * Should be called with sessions mutex held.
1561 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1563 /* We can skip if session is not active */
1564 if (!session
->active
)
1566 lttng_session_sync_enablers(session
);
1570 * Serialize at most one packet worth of metadata into a metadata
1572 * We grab the metadata cache mutex to get exclusive access to our metadata
1573 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1574 * allows us to do racy operations such as looking for remaining space left in
1575 * packet and write, since mutual exclusion protects us from concurrent writes.
1576 * Mutual exclusion on the metadata cache allow us to read the cache content
1577 * without racing against reallocation of the cache by updates.
1578 * Returns the number of bytes written in the channel, 0 if no data
1579 * was written and a negative value on error.
1581 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1582 struct channel
*chan
)
1584 struct lib_ring_buffer_ctx ctx
;
1586 size_t len
, reserve_len
;
1589 * Ensure we support mutiple get_next / put sequences followed by
1590 * put_next. The metadata cache lock protects reading the metadata
1591 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1592 * "flush" operations on the buffer invoked by different processes.
1593 * Moreover, since the metadata cache memory can be reallocated, we
1594 * need to have exclusive access against updates even though we only
1597 mutex_lock(&stream
->metadata_cache
->lock
);
1598 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1599 if (stream
->metadata_in
!= stream
->metadata_out
)
1602 /* Metadata regenerated, change the version. */
1603 if (stream
->metadata_cache
->version
!= stream
->version
)
1604 stream
->version
= stream
->metadata_cache
->version
;
1606 len
= stream
->metadata_cache
->metadata_written
-
1607 stream
->metadata_in
;
1610 reserve_len
= min_t(size_t,
1611 stream
->transport
->ops
.packet_avail_size(chan
),
1613 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1616 * If reservation failed, return an error to the caller.
1618 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1620 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1623 stream
->transport
->ops
.event_write(&ctx
,
1624 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1626 stream
->transport
->ops
.event_commit(&ctx
);
1627 stream
->metadata_in
+= reserve_len
;
1631 mutex_unlock(&stream
->metadata_cache
->lock
);
1636 * Write the metadata to the metadata cache.
1637 * Must be called with sessions_mutex held.
1638 * The metadata cache lock protects us from concurrent read access from
1639 * thread outputting metadata content to ring buffer.
1641 int lttng_metadata_printf(struct lttng_session
*session
,
1642 const char *fmt
, ...)
1647 struct lttng_metadata_stream
*stream
;
1649 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1652 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1658 mutex_lock(&session
->metadata_cache
->lock
);
1659 if (session
->metadata_cache
->metadata_written
+ len
>
1660 session
->metadata_cache
->cache_alloc
) {
1661 char *tmp_cache_realloc
;
1662 unsigned int tmp_cache_alloc_size
;
1664 tmp_cache_alloc_size
= max_t(unsigned int,
1665 session
->metadata_cache
->cache_alloc
+ len
,
1666 session
->metadata_cache
->cache_alloc
<< 1);
1667 tmp_cache_realloc
= lttng_vzalloc(tmp_cache_alloc_size
);
1668 if (!tmp_cache_realloc
)
1670 if (session
->metadata_cache
->data
) {
1671 memcpy(tmp_cache_realloc
,
1672 session
->metadata_cache
->data
,
1673 session
->metadata_cache
->cache_alloc
);
1674 vfree(session
->metadata_cache
->data
);
1677 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1678 session
->metadata_cache
->data
= tmp_cache_realloc
;
1680 memcpy(session
->metadata_cache
->data
+
1681 session
->metadata_cache
->metadata_written
,
1683 session
->metadata_cache
->metadata_written
+= len
;
1684 mutex_unlock(&session
->metadata_cache
->lock
);
1687 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1688 wake_up_interruptible(&stream
->read_wait
);
1693 mutex_unlock(&session
->metadata_cache
->lock
);
1699 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1703 for (i
= 0; i
< nesting
; i
++) {
1706 ret
= lttng_metadata_printf(session
, " ");
1715 * Must be called with sessions_mutex held.
1718 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1719 const struct lttng_type
*type
,
1723 uint32_t i
, nr_fields
;
1725 ret
= print_tabs(session
, nesting
);
1728 ret
= lttng_metadata_printf(session
,
1732 nr_fields
= type
->u
._struct
.nr_fields
;
1733 for (i
= 0; i
< nr_fields
; i
++) {
1734 const struct lttng_event_field
*iter_field
;
1736 iter_field
= &type
->u
._struct
.fields
[i
];
1737 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1741 ret
= print_tabs(session
, nesting
);
1744 ret
= lttng_metadata_printf(session
,
1750 * Must be called with sessions_mutex held.
1753 int _lttng_struct_statedump(struct lttng_session
*session
,
1754 const struct lttng_event_field
*field
,
1759 ret
= _lttng_struct_type_statedump(session
,
1760 &field
->type
, nesting
);
1763 ret
= lttng_metadata_printf(session
,
1770 * Must be called with sessions_mutex held.
1773 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1774 const struct lttng_type
*type
,
1778 uint32_t i
, nr_choices
;
1780 ret
= print_tabs(session
, nesting
);
1783 ret
= lttng_metadata_printf(session
,
1784 "variant <_%s> {\n",
1785 type
->u
.variant
.tag_name
);
1788 nr_choices
= type
->u
.variant
.nr_choices
;
1789 for (i
= 0; i
< nr_choices
; i
++) {
1790 const struct lttng_event_field
*iter_field
;
1792 iter_field
= &type
->u
.variant
.choices
[i
];
1793 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1797 ret
= print_tabs(session
, nesting
);
1800 ret
= lttng_metadata_printf(session
,
1806 * Must be called with sessions_mutex held.
1809 int _lttng_variant_statedump(struct lttng_session
*session
,
1810 const struct lttng_event_field
*field
,
1815 ret
= _lttng_variant_type_statedump(session
,
1816 &field
->type
, nesting
);
1819 ret
= lttng_metadata_printf(session
,
1826 * Must be called with sessions_mutex held.
1829 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1830 const struct lttng_event_field
*field
,
1834 const struct lttng_type
*elem_type
;
1836 /* Only array of structures and variants are currently supported. */
1837 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1838 switch (elem_type
->atype
) {
1840 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1845 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1852 ret
= lttng_metadata_printf(session
,
1855 field
->type
.u
.array_compound
.length
);
1860 * Must be called with sessions_mutex held.
1863 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1864 const struct lttng_event_field
*field
,
1868 const char *length_name
;
1869 const struct lttng_type
*elem_type
;
1871 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1873 /* Only array of structures and variants are currently supported. */
1874 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1875 switch (elem_type
->atype
) {
1877 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1882 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1889 ret
= lttng_metadata_printf(session
,
1897 * Must be called with sessions_mutex held.
1900 int _lttng_enum_statedump(struct lttng_session
*session
,
1901 const struct lttng_event_field
*field
,
1904 const struct lttng_enum_desc
*enum_desc
;
1905 const struct lttng_integer_type
*container_type
;
1907 unsigned int i
, nr_entries
;
1909 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1910 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1911 nr_entries
= enum_desc
->nr_entries
;
1913 ret
= print_tabs(session
, nesting
);
1916 ret
= lttng_metadata_printf(session
,
1917 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1918 container_type
->size
,
1919 container_type
->alignment
,
1920 container_type
->signedness
,
1921 (container_type
->encoding
== lttng_encode_none
)
1923 : (container_type
->encoding
== lttng_encode_UTF8
)
1926 container_type
->base
,
1927 #if __BYTE_ORDER == __BIG_ENDIAN
1928 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1930 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1935 /* Dump all entries */
1936 for (i
= 0; i
< nr_entries
; i
++) {
1937 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1940 ret
= print_tabs(session
, nesting
+ 1);
1943 ret
= lttng_metadata_printf(session
,
1947 len
= strlen(entry
->string
);
1948 /* Escape the character '"' */
1949 for (j
= 0; j
< len
; j
++) {
1950 char c
= entry
->string
[j
];
1954 ret
= lttng_metadata_printf(session
,
1958 ret
= lttng_metadata_printf(session
,
1962 ret
= lttng_metadata_printf(session
,
1969 ret
= lttng_metadata_printf(session
, "\"");
1973 if (entry
->options
.is_auto
) {
1974 ret
= lttng_metadata_printf(session
, ",\n");
1978 ret
= lttng_metadata_printf(session
,
1982 if (entry
->start
.signedness
)
1983 ret
= lttng_metadata_printf(session
,
1984 "%lld", (long long) entry
->start
.value
);
1986 ret
= lttng_metadata_printf(session
,
1987 "%llu", entry
->start
.value
);
1990 if (entry
->start
.signedness
== entry
->end
.signedness
&&
1992 == entry
->end
.value
) {
1993 ret
= lttng_metadata_printf(session
,
1996 if (entry
->end
.signedness
) {
1997 ret
= lttng_metadata_printf(session
,
1999 (long long) entry
->end
.value
);
2001 ret
= lttng_metadata_printf(session
,
2010 ret
= print_tabs(session
, nesting
);
2013 ret
= lttng_metadata_printf(session
, "} _%s;\n",
2020 * Must be called with sessions_mutex held.
2023 int _lttng_field_statedump(struct lttng_session
*session
,
2024 const struct lttng_event_field
*field
,
2029 switch (field
->type
.atype
) {
2031 ret
= print_tabs(session
, nesting
);
2034 ret
= lttng_metadata_printf(session
,
2035 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2036 field
->type
.u
.basic
.integer
.size
,
2037 field
->type
.u
.basic
.integer
.alignment
,
2038 field
->type
.u
.basic
.integer
.signedness
,
2039 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2041 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2044 field
->type
.u
.basic
.integer
.base
,
2045 #if __BYTE_ORDER == __BIG_ENDIAN
2046 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2048 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2053 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2057 const struct lttng_basic_type
*elem_type
;
2059 elem_type
= &field
->type
.u
.array
.elem_type
;
2060 if (field
->type
.u
.array
.elem_alignment
) {
2061 ret
= print_tabs(session
, nesting
);
2064 ret
= lttng_metadata_printf(session
,
2065 "struct { } align(%u) _%s_padding;\n",
2066 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2071 ret
= print_tabs(session
, nesting
);
2074 ret
= lttng_metadata_printf(session
,
2075 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2076 elem_type
->u
.basic
.integer
.size
,
2077 elem_type
->u
.basic
.integer
.alignment
,
2078 elem_type
->u
.basic
.integer
.signedness
,
2079 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2081 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2084 elem_type
->u
.basic
.integer
.base
,
2085 #if __BYTE_ORDER == __BIG_ENDIAN
2086 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2088 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2090 field
->name
, field
->type
.u
.array
.length
);
2093 case atype_sequence
:
2095 const struct lttng_basic_type
*elem_type
;
2096 const struct lttng_basic_type
*length_type
;
2098 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2099 length_type
= &field
->type
.u
.sequence
.length_type
;
2100 ret
= print_tabs(session
, nesting
);
2103 ret
= lttng_metadata_printf(session
,
2104 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2105 length_type
->u
.basic
.integer
.size
,
2106 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2107 length_type
->u
.basic
.integer
.signedness
,
2108 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2110 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2113 length_type
->u
.basic
.integer
.base
,
2114 #if __BYTE_ORDER == __BIG_ENDIAN
2115 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2117 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2123 if (field
->type
.u
.sequence
.elem_alignment
) {
2124 ret
= print_tabs(session
, nesting
);
2127 ret
= lttng_metadata_printf(session
,
2128 "struct { } align(%u) _%s_padding;\n",
2129 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2134 ret
= print_tabs(session
, nesting
);
2137 ret
= lttng_metadata_printf(session
,
2138 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2139 elem_type
->u
.basic
.integer
.size
,
2140 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2141 elem_type
->u
.basic
.integer
.signedness
,
2142 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2144 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2147 elem_type
->u
.basic
.integer
.base
,
2148 #if __BYTE_ORDER == __BIG_ENDIAN
2149 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2151 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2159 /* Default encoding is UTF8 */
2160 ret
= print_tabs(session
, nesting
);
2163 ret
= lttng_metadata_printf(session
,
2165 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2166 " { encoding = ASCII; }" : "",
2170 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2172 case atype_array_compound
:
2173 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2175 case atype_sequence_compound
:
2176 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2179 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2190 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2191 struct lttng_ctx
*ctx
)
2198 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2199 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2201 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2209 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2210 struct lttng_event
*event
)
2212 const struct lttng_event_desc
*desc
= event
->desc
;
2216 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2217 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2219 ret
= _lttng_field_statedump(session
, field
, 2);
2227 * Must be called with sessions_mutex held.
2230 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2231 struct lttng_channel
*chan
,
2232 struct lttng_event
*event
)
2236 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2238 if (chan
->channel_type
== METADATA_CHANNEL
)
2241 ret
= lttng_metadata_printf(session
,
2245 " stream_id = %u;\n",
2253 ret
= lttng_metadata_printf(session
,
2254 " context := struct {\n");
2258 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2262 ret
= lttng_metadata_printf(session
,
2268 ret
= lttng_metadata_printf(session
,
2269 " fields := struct {\n"
2274 ret
= _lttng_fields_metadata_statedump(session
, event
);
2279 * LTTng space reservation can only reserve multiples of the
2282 ret
= lttng_metadata_printf(session
,
2288 event
->metadata_dumped
= 1;
2295 * Must be called with sessions_mutex held.
2298 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2299 struct lttng_channel
*chan
)
2303 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2306 if (chan
->channel_type
== METADATA_CHANNEL
)
2309 WARN_ON_ONCE(!chan
->header_type
);
2310 ret
= lttng_metadata_printf(session
,
2313 " event.header := %s;\n"
2314 " packet.context := struct packet_context;\n",
2316 chan
->header_type
== 1 ? "struct event_header_compact" :
2317 "struct event_header_large");
2322 ret
= lttng_metadata_printf(session
,
2323 " event.context := struct {\n");
2327 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2331 ret
= lttng_metadata_printf(session
,
2337 ret
= lttng_metadata_printf(session
,
2340 chan
->metadata_dumped
= 1;
2346 * Must be called with sessions_mutex held.
2349 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2351 return lttng_metadata_printf(session
,
2352 "struct packet_context {\n"
2353 " uint64_clock_monotonic_t timestamp_begin;\n"
2354 " uint64_clock_monotonic_t timestamp_end;\n"
2355 " uint64_t content_size;\n"
2356 " uint64_t packet_size;\n"
2357 " uint64_t packet_seq_num;\n"
2358 " unsigned long events_discarded;\n"
2359 " uint32_t cpu_id;\n"
2366 * id: range: 0 - 30.
2367 * id 31 is reserved to indicate an extended header.
2370 * id: range: 0 - 65534.
2371 * id 65535 is reserved to indicate an extended header.
2373 * Must be called with sessions_mutex held.
2376 int _lttng_event_header_declare(struct lttng_session
*session
)
2378 return lttng_metadata_printf(session
,
2379 "struct event_header_compact {\n"
2380 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2383 " uint27_clock_monotonic_t timestamp;\n"
2387 " uint64_clock_monotonic_t timestamp;\n"
2392 "struct event_header_large {\n"
2393 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2396 " uint32_clock_monotonic_t timestamp;\n"
2400 " uint64_clock_monotonic_t timestamp;\n"
2404 lttng_alignof(uint32_t) * CHAR_BIT
,
2405 lttng_alignof(uint16_t) * CHAR_BIT
2410 * Approximation of NTP time of day to clock monotonic correlation,
2411 * taken at start of trace.
2412 * Yes, this is only an approximation. Yes, we can (and will) do better
2413 * in future versions.
2414 * This function may return a negative offset. It may happen if the
2415 * system sets the REALTIME clock to 0 after boot.
2418 int64_t measure_clock_offset(void)
2420 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2421 uint64_t tcf
= trace_clock_freq();
2423 struct timespec rts
= { 0, 0 };
2424 unsigned long flags
;
2426 /* Disable interrupts to increase correlation precision. */
2427 local_irq_save(flags
);
2428 monotonic
[0] = trace_clock_read64();
2429 getnstimeofday(&rts
);
2430 monotonic
[1] = trace_clock_read64();
2431 local_irq_restore(flags
);
2433 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2434 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2435 if (tcf
== NSEC_PER_SEC
) {
2436 realtime
+= rts
.tv_nsec
;
2438 uint64_t n
= rts
.tv_nsec
* tcf
;
2440 do_div(n
, NSEC_PER_SEC
);
2443 offset
= (int64_t) realtime
- monotonic_avg
;
2448 * Output metadata into this session's metadata buffers.
2449 * Must be called with sessions_mutex held.
2452 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2454 unsigned char *uuid_c
= session
->uuid
.b
;
2455 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2456 struct lttng_channel
*chan
;
2457 struct lttng_event
*event
;
2460 if (!READ_ONCE(session
->active
))
2462 if (session
->metadata_dumped
)
2465 snprintf(uuid_s
, sizeof(uuid_s
),
2466 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2467 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2468 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2469 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2470 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2472 ret
= lttng_metadata_printf(session
,
2473 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2474 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2475 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2476 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2477 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2478 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2479 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2485 " byte_order = %s;\n"
2486 " packet.header := struct {\n"
2487 " uint32_t magic;\n"
2488 " uint8_t uuid[16];\n"
2489 " uint32_t stream_id;\n"
2490 " uint64_t stream_instance_id;\n"
2493 lttng_alignof(uint8_t) * CHAR_BIT
,
2494 lttng_alignof(uint16_t) * CHAR_BIT
,
2495 lttng_alignof(uint32_t) * CHAR_BIT
,
2496 lttng_alignof(uint64_t) * CHAR_BIT
,
2497 sizeof(unsigned long) * CHAR_BIT
,
2498 lttng_alignof(unsigned long) * CHAR_BIT
,
2502 #if __BYTE_ORDER == __BIG_ENDIAN
2511 ret
= lttng_metadata_printf(session
,
2513 " hostname = \"%s\";\n"
2514 " domain = \"kernel\";\n"
2515 " sysname = \"%s\";\n"
2516 " kernel_release = \"%s\";\n"
2517 " kernel_version = \"%s\";\n"
2518 " tracer_name = \"lttng-modules\";\n"
2519 " tracer_major = %d;\n"
2520 " tracer_minor = %d;\n"
2521 " tracer_patchlevel = %d;\n"
2523 current
->nsproxy
->uts_ns
->name
.nodename
,
2527 LTTNG_MODULES_MAJOR_VERSION
,
2528 LTTNG_MODULES_MINOR_VERSION
,
2529 LTTNG_MODULES_PATCHLEVEL_VERSION
2534 ret
= lttng_metadata_printf(session
,
2536 " name = \"%s\";\n",
2542 if (!trace_clock_uuid(clock_uuid_s
)) {
2543 ret
= lttng_metadata_printf(session
,
2544 " uuid = \"%s\";\n",
2551 ret
= lttng_metadata_printf(session
,
2552 " description = \"%s\";\n"
2553 " freq = %llu; /* Frequency, in Hz */\n"
2554 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2557 trace_clock_description(),
2558 (unsigned long long) trace_clock_freq(),
2559 (long long) measure_clock_offset()
2564 ret
= lttng_metadata_printf(session
,
2565 "typealias integer {\n"
2566 " size = 27; align = 1; signed = false;\n"
2567 " map = clock.%s.value;\n"
2568 "} := uint27_clock_monotonic_t;\n"
2570 "typealias integer {\n"
2571 " size = 32; align = %u; signed = false;\n"
2572 " map = clock.%s.value;\n"
2573 "} := uint32_clock_monotonic_t;\n"
2575 "typealias integer {\n"
2576 " size = 64; align = %u; signed = false;\n"
2577 " map = clock.%s.value;\n"
2578 "} := uint64_clock_monotonic_t;\n\n",
2580 lttng_alignof(uint32_t) * CHAR_BIT
,
2582 lttng_alignof(uint64_t) * CHAR_BIT
,
2588 ret
= _lttng_stream_packet_context_declare(session
);
2592 ret
= _lttng_event_header_declare(session
);
2597 list_for_each_entry(chan
, &session
->chan
, list
) {
2598 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2603 list_for_each_entry(event
, &session
->events
, list
) {
2604 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2608 session
->metadata_dumped
= 1;
2614 * lttng_transport_register - LTT transport registration
2615 * @transport: transport structure
2617 * Registers a transport which can be used as output to extract the data out of
2618 * LTTng. The module calling this registration function must ensure that no
2619 * trap-inducing code will be executed by the transport functions. E.g.
2620 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2621 * is made visible to the transport function. This registration acts as a
2622 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2623 * after its registration must it synchronize the TLBs.
2625 void lttng_transport_register(struct lttng_transport
*transport
)
2628 * Make sure no page fault can be triggered by the module about to be
2629 * registered. We deal with this here so we don't have to call
2630 * vmalloc_sync_all() in each module's init.
2632 wrapper_vmalloc_sync_all();
2634 mutex_lock(&sessions_mutex
);
2635 list_add_tail(&transport
->node
, <tng_transport_list
);
2636 mutex_unlock(&sessions_mutex
);
2638 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2641 * lttng_transport_unregister - LTT transport unregistration
2642 * @transport: transport structure
2644 void lttng_transport_unregister(struct lttng_transport
*transport
)
2646 mutex_lock(&sessions_mutex
);
2647 list_del(&transport
->node
);
2648 mutex_unlock(&sessions_mutex
);
2650 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2652 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2654 enum cpuhp_state lttng_hp_prepare
;
2655 enum cpuhp_state lttng_hp_online
;
2657 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2659 struct lttng_cpuhp_node
*lttng_node
;
2661 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2662 switch (lttng_node
->component
) {
2663 case LTTNG_RING_BUFFER_FRONTEND
:
2665 case LTTNG_RING_BUFFER_BACKEND
:
2666 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2667 case LTTNG_RING_BUFFER_ITER
:
2669 case LTTNG_CONTEXT_PERF_COUNTERS
:
2676 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2678 struct lttng_cpuhp_node
*lttng_node
;
2680 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2681 switch (lttng_node
->component
) {
2682 case LTTNG_RING_BUFFER_FRONTEND
:
2683 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2684 case LTTNG_RING_BUFFER_BACKEND
:
2686 case LTTNG_RING_BUFFER_ITER
:
2688 case LTTNG_CONTEXT_PERF_COUNTERS
:
2689 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2695 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2697 struct lttng_cpuhp_node
*lttng_node
;
2699 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2700 switch (lttng_node
->component
) {
2701 case LTTNG_RING_BUFFER_FRONTEND
:
2702 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2703 case LTTNG_RING_BUFFER_BACKEND
:
2705 case LTTNG_RING_BUFFER_ITER
:
2706 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2707 case LTTNG_CONTEXT_PERF_COUNTERS
:
2708 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2714 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2716 struct lttng_cpuhp_node
*lttng_node
;
2718 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2719 switch (lttng_node
->component
) {
2720 case LTTNG_RING_BUFFER_FRONTEND
:
2721 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2722 case LTTNG_RING_BUFFER_BACKEND
:
2724 case LTTNG_RING_BUFFER_ITER
:
2726 case LTTNG_CONTEXT_PERF_COUNTERS
:
2733 static int __init
lttng_init_cpu_hotplug(void)
2737 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2738 lttng_hotplug_prepare
,
2739 lttng_hotplug_dead
);
2743 lttng_hp_prepare
= ret
;
2744 lttng_rb_set_hp_prepare(ret
);
2746 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2747 lttng_hotplug_online
,
2748 lttng_hotplug_offline
);
2750 cpuhp_remove_multi_state(lttng_hp_prepare
);
2751 lttng_hp_prepare
= 0;
2754 lttng_hp_online
= ret
;
2755 lttng_rb_set_hp_online(ret
);
2760 static void __exit
lttng_exit_cpu_hotplug(void)
2762 lttng_rb_set_hp_online(0);
2763 cpuhp_remove_multi_state(lttng_hp_online
);
2764 lttng_rb_set_hp_prepare(0);
2765 cpuhp_remove_multi_state(lttng_hp_prepare
);
2768 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2769 static int lttng_init_cpu_hotplug(void)
2773 static void lttng_exit_cpu_hotplug(void)
2776 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2779 static int __init
lttng_events_init(void)
2783 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2786 ret
= wrapper_get_pfnblock_flags_mask_init();
2789 ret
= wrapper_get_pageblock_flags_mask_init();
2792 ret
= lttng_probes_init();
2795 ret
= lttng_context_init();
2798 ret
= lttng_tracepoint_init();
2801 event_cache
= KMEM_CACHE(lttng_event
, 0);
2806 ret
= lttng_abi_init();
2809 ret
= lttng_logger_init();
2812 ret
= lttng_init_cpu_hotplug();
2815 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2816 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2817 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2818 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2819 LTTNG_MODULES_EXTRAVERSION
,
2821 #ifdef LTTNG_EXTRA_VERSION_GIT
2822 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2826 #ifdef LTTNG_EXTRA_VERSION_NAME
2827 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2834 lttng_logger_exit();
2838 kmem_cache_destroy(event_cache
);
2840 lttng_tracepoint_exit();
2842 lttng_context_exit();
2843 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2844 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2845 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2846 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2847 LTTNG_MODULES_EXTRAVERSION
,
2849 #ifdef LTTNG_EXTRA_VERSION_GIT
2850 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2854 #ifdef LTTNG_EXTRA_VERSION_NAME
2855 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2862 module_init(lttng_events_init
);
2864 static void __exit
lttng_events_exit(void)
2866 struct lttng_session
*session
, *tmpsession
;
2868 lttng_exit_cpu_hotplug();
2869 lttng_logger_exit();
2871 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2872 lttng_session_destroy(session
);
2873 kmem_cache_destroy(event_cache
);
2874 lttng_tracepoint_exit();
2875 lttng_context_exit();
2876 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2877 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2878 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2879 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2880 LTTNG_MODULES_EXTRAVERSION
,
2882 #ifdef LTTNG_EXTRA_VERSION_GIT
2883 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2887 #ifdef LTTNG_EXTRA_VERSION_NAME
2888 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2894 module_exit(lttng_events_exit
);
2896 #include "extra_version/patches.i"
2897 #ifdef LTTNG_EXTRA_VERSION_GIT
2898 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
2900 #ifdef LTTNG_EXTRA_VERSION_NAME
2901 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
2903 MODULE_LICENSE("GPL and additional rights");
2904 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2905 MODULE_DESCRIPTION("LTTng Events");
2906 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
2907 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
2908 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
2909 LTTNG_MODULES_EXTRAVERSION
);