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 <wrapper/types.h>
50 #include <lttng-kernel-version.h>
51 #include <lttng-events.h>
52 #include <lttng-tracer.h>
53 #include <lttng-abi-old.h>
54 #include <lttng-endian.h>
55 #include <lttng-string-utils.h>
56 #include <wrapper/vzalloc.h>
57 #include <wrapper/ringbuffer/backend.h>
58 #include <wrapper/ringbuffer/frontend.h>
60 #define METADATA_CACHE_DEFAULT_SIZE 4096
62 static LIST_HEAD(sessions
);
63 static LIST_HEAD(lttng_transport_list
);
65 * Protect the sessions and metadata caches.
67 static DEFINE_MUTEX(sessions_mutex
);
68 static struct kmem_cache
*event_cache
;
70 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
71 static void lttng_session_sync_enablers(struct lttng_session
*session
);
72 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
74 static void _lttng_event_destroy(struct lttng_event
*event
);
75 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
76 static int _lttng_event_unregister(struct lttng_event
*event
);
78 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
79 struct lttng_channel
*chan
,
80 struct lttng_event
*event
);
82 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
84 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
86 int _lttng_field_statedump(struct lttng_session
*session
,
87 const struct lttng_event_field
*field
,
90 void synchronize_trace(void)
92 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
98 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
99 #ifdef CONFIG_PREEMPT_RT_FULL
102 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
103 #ifdef CONFIG_PREEMPT_RT
106 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
109 void lttng_lock_sessions(void)
111 mutex_lock(&sessions_mutex
);
114 void lttng_unlock_sessions(void)
116 mutex_unlock(&sessions_mutex
);
120 * Called with sessions lock held.
122 int lttng_session_active(void)
124 struct lttng_session
*iter
;
126 list_for_each_entry(iter
, &sessions
, list
) {
133 struct lttng_session
*lttng_session_create(void)
135 struct lttng_session
*session
;
136 struct lttng_metadata_cache
*metadata_cache
;
139 mutex_lock(&sessions_mutex
);
140 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
143 INIT_LIST_HEAD(&session
->chan
);
144 INIT_LIST_HEAD(&session
->events
);
145 uuid_le_gen(&session
->uuid
);
147 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
150 goto err_free_session
;
151 metadata_cache
->data
= lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
152 if (!metadata_cache
->data
)
154 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
155 kref_init(&metadata_cache
->refcount
);
156 mutex_init(&metadata_cache
->lock
);
157 session
->metadata_cache
= metadata_cache
;
158 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
159 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
160 sizeof(metadata_cache
->uuid
));
161 INIT_LIST_HEAD(&session
->enablers_head
);
162 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
163 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
164 list_add(&session
->list
, &sessions
);
165 mutex_unlock(&sessions_mutex
);
169 kfree(metadata_cache
);
171 lttng_kvfree(session
);
173 mutex_unlock(&sessions_mutex
);
177 void metadata_cache_destroy(struct kref
*kref
)
179 struct lttng_metadata_cache
*cache
=
180 container_of(kref
, struct lttng_metadata_cache
, refcount
);
185 void lttng_session_destroy(struct lttng_session
*session
)
187 struct lttng_channel
*chan
, *tmpchan
;
188 struct lttng_event
*event
, *tmpevent
;
189 struct lttng_metadata_stream
*metadata_stream
;
190 struct lttng_enabler
*enabler
, *tmpenabler
;
193 mutex_lock(&sessions_mutex
);
194 WRITE_ONCE(session
->active
, 0);
195 list_for_each_entry(chan
, &session
->chan
, list
) {
196 ret
= lttng_syscalls_unregister(chan
);
199 list_for_each_entry(event
, &session
->events
, list
) {
200 ret
= _lttng_event_unregister(event
);
203 synchronize_trace(); /* Wait for in-flight events to complete */
204 list_for_each_entry_safe(enabler
, tmpenabler
,
205 &session
->enablers_head
, node
)
206 lttng_enabler_destroy(enabler
);
207 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
208 _lttng_event_destroy(event
);
209 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
210 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
211 _lttng_channel_destroy(chan
);
213 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
214 _lttng_metadata_channel_hangup(metadata_stream
);
215 if (session
->pid_tracker
)
216 lttng_pid_tracker_destroy(session
->pid_tracker
);
217 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
218 list_del(&session
->list
);
219 mutex_unlock(&sessions_mutex
);
220 lttng_kvfree(session
);
223 int lttng_session_statedump(struct lttng_session
*session
)
227 mutex_lock(&sessions_mutex
);
228 ret
= lttng_statedump_start(session
);
229 mutex_unlock(&sessions_mutex
);
233 int lttng_session_enable(struct lttng_session
*session
)
236 struct lttng_channel
*chan
;
238 mutex_lock(&sessions_mutex
);
239 if (session
->active
) {
244 /* Set transient enabler state to "enabled" */
248 * Snapshot the number of events per channel to know the type of header
251 list_for_each_entry(chan
, &session
->chan
, list
) {
252 if (chan
->header_type
)
253 continue; /* don't change it if session stop/restart */
254 if (chan
->free_event_id
< 31)
255 chan
->header_type
= 1; /* compact */
257 chan
->header_type
= 2; /* large */
260 /* We need to sync enablers with session before activation. */
261 lttng_session_sync_enablers(session
);
263 /* Clear each stream's quiescent state. */
264 list_for_each_entry(chan
, &session
->chan
, list
) {
265 if (chan
->channel_type
!= METADATA_CHANNEL
)
266 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
269 WRITE_ONCE(session
->active
, 1);
270 WRITE_ONCE(session
->been_active
, 1);
271 ret
= _lttng_session_metadata_statedump(session
);
273 WRITE_ONCE(session
->active
, 0);
276 ret
= lttng_statedump_start(session
);
278 WRITE_ONCE(session
->active
, 0);
280 mutex_unlock(&sessions_mutex
);
284 int lttng_session_disable(struct lttng_session
*session
)
287 struct lttng_channel
*chan
;
289 mutex_lock(&sessions_mutex
);
290 if (!session
->active
) {
294 WRITE_ONCE(session
->active
, 0);
296 /* Set transient enabler state to "disabled" */
298 lttng_session_sync_enablers(session
);
300 /* Set each stream's quiescent state. */
301 list_for_each_entry(chan
, &session
->chan
, list
) {
302 if (chan
->channel_type
!= METADATA_CHANNEL
)
303 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
306 mutex_unlock(&sessions_mutex
);
310 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
313 struct lttng_channel
*chan
;
314 struct lttng_event
*event
;
315 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
316 struct lttng_metadata_stream
*stream
;
318 mutex_lock(&sessions_mutex
);
319 if (!session
->active
) {
324 mutex_lock(&cache
->lock
);
325 memset(cache
->data
, 0, cache
->cache_alloc
);
326 cache
->metadata_written
= 0;
328 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
329 stream
->metadata_out
= 0;
330 stream
->metadata_in
= 0;
332 mutex_unlock(&cache
->lock
);
334 session
->metadata_dumped
= 0;
335 list_for_each_entry(chan
, &session
->chan
, list
) {
336 chan
->metadata_dumped
= 0;
339 list_for_each_entry(event
, &session
->events
, list
) {
340 event
->metadata_dumped
= 0;
343 ret
= _lttng_session_metadata_statedump(session
);
346 mutex_unlock(&sessions_mutex
);
352 int lttng_channel_enable(struct lttng_channel
*channel
)
356 mutex_lock(&sessions_mutex
);
357 if (channel
->channel_type
== METADATA_CHANNEL
) {
361 if (channel
->enabled
) {
365 /* Set transient enabler state to "enabled" */
367 lttng_session_sync_enablers(channel
->session
);
368 /* Set atomically the state to "enabled" */
369 WRITE_ONCE(channel
->enabled
, 1);
371 mutex_unlock(&sessions_mutex
);
375 int lttng_channel_disable(struct lttng_channel
*channel
)
379 mutex_lock(&sessions_mutex
);
380 if (channel
->channel_type
== METADATA_CHANNEL
) {
384 if (!channel
->enabled
) {
388 /* Set atomically the state to "disabled" */
389 WRITE_ONCE(channel
->enabled
, 0);
390 /* Set transient enabler state to "enabled" */
392 lttng_session_sync_enablers(channel
->session
);
394 mutex_unlock(&sessions_mutex
);
398 int lttng_event_enable(struct lttng_event
*event
)
402 mutex_lock(&sessions_mutex
);
403 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
407 if (event
->enabled
) {
411 switch (event
->instrumentation
) {
412 case LTTNG_KERNEL_TRACEPOINT
:
413 case LTTNG_KERNEL_SYSCALL
:
416 case LTTNG_KERNEL_KPROBE
:
417 case LTTNG_KERNEL_FUNCTION
:
418 case LTTNG_KERNEL_NOOP
:
419 WRITE_ONCE(event
->enabled
, 1);
421 case LTTNG_KERNEL_KRETPROBE
:
422 ret
= lttng_kretprobes_event_enable_state(event
, 1);
429 mutex_unlock(&sessions_mutex
);
433 int lttng_event_disable(struct lttng_event
*event
)
437 mutex_lock(&sessions_mutex
);
438 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
442 if (!event
->enabled
) {
446 switch (event
->instrumentation
) {
447 case LTTNG_KERNEL_TRACEPOINT
:
448 case LTTNG_KERNEL_SYSCALL
:
451 case LTTNG_KERNEL_KPROBE
:
452 case LTTNG_KERNEL_FUNCTION
:
453 case LTTNG_KERNEL_NOOP
:
454 WRITE_ONCE(event
->enabled
, 0);
456 case LTTNG_KERNEL_KRETPROBE
:
457 ret
= lttng_kretprobes_event_enable_state(event
, 0);
464 mutex_unlock(&sessions_mutex
);
468 static struct lttng_transport
*lttng_transport_find(const char *name
)
470 struct lttng_transport
*transport
;
472 list_for_each_entry(transport
, <tng_transport_list
, node
) {
473 if (!strcmp(transport
->name
, name
))
479 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
480 const char *transport_name
,
482 size_t subbuf_size
, size_t num_subbuf
,
483 unsigned int switch_timer_interval
,
484 unsigned int read_timer_interval
,
485 enum channel_type channel_type
)
487 struct lttng_channel
*chan
;
488 struct lttng_transport
*transport
= NULL
;
490 mutex_lock(&sessions_mutex
);
491 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
492 goto active
; /* Refuse to add channel to active session */
493 transport
= lttng_transport_find(transport_name
);
495 printk(KERN_WARNING
"LTTng transport %s not found\n",
499 if (!try_module_get(transport
->owner
)) {
500 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
503 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
506 chan
->session
= session
;
507 chan
->id
= session
->free_chan_id
++;
508 chan
->ops
= &transport
->ops
;
510 * Note: the channel creation op already writes into the packet
511 * headers. Therefore the "chan" information used as input
512 * should be already accessible.
514 chan
->chan
= transport
->ops
.channel_create(transport_name
,
515 chan
, buf_addr
, subbuf_size
, num_subbuf
,
516 switch_timer_interval
, read_timer_interval
);
521 chan
->transport
= transport
;
522 chan
->channel_type
= channel_type
;
523 list_add(&chan
->list
, &session
->chan
);
524 mutex_unlock(&sessions_mutex
);
531 module_put(transport
->owner
);
534 mutex_unlock(&sessions_mutex
);
539 * Only used internally at session destruction for per-cpu channels, and
540 * when metadata channel is released.
541 * Needs to be called with sessions mutex held.
544 void _lttng_channel_destroy(struct lttng_channel
*chan
)
546 chan
->ops
->channel_destroy(chan
->chan
);
547 module_put(chan
->transport
->owner
);
548 list_del(&chan
->list
);
549 lttng_destroy_context(chan
->ctx
);
553 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
555 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
557 /* Protect the metadata cache with the sessions_mutex. */
558 mutex_lock(&sessions_mutex
);
559 _lttng_channel_destroy(chan
);
560 mutex_unlock(&sessions_mutex
);
562 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
565 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
567 stream
->finalized
= 1;
568 wake_up_interruptible(&stream
->read_wait
);
572 * Supports event creation while tracing session is active.
573 * Needs to be called with sessions mutex held.
575 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
576 struct lttng_kernel_event
*event_param
,
578 const struct lttng_event_desc
*event_desc
,
579 enum lttng_kernel_instrumentation itype
)
581 struct lttng_session
*session
= chan
->session
;
582 struct lttng_event
*event
;
583 const char *event_name
;
584 struct hlist_head
*head
;
589 if (chan
->free_event_id
== -1U) {
595 case LTTNG_KERNEL_TRACEPOINT
:
596 event_name
= event_desc
->name
;
598 case LTTNG_KERNEL_KPROBE
:
599 case LTTNG_KERNEL_KRETPROBE
:
600 case LTTNG_KERNEL_FUNCTION
:
601 case LTTNG_KERNEL_NOOP
:
602 case LTTNG_KERNEL_SYSCALL
:
603 event_name
= event_param
->name
;
610 name_len
= strlen(event_name
);
611 hash
= jhash(event_name
, name_len
, 0);
612 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
613 lttng_hlist_for_each_entry(event
, head
, hlist
) {
614 WARN_ON_ONCE(!event
->desc
);
615 if (!strncmp(event
->desc
->name
, event_name
,
616 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
617 && chan
== event
->chan
) {
623 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
629 event
->filter
= filter
;
630 event
->id
= chan
->free_event_id
++;
631 event
->instrumentation
= itype
;
632 event
->evtype
= LTTNG_TYPE_EVENT
;
633 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
634 INIT_LIST_HEAD(&event
->enablers_ref_head
);
637 case LTTNG_KERNEL_TRACEPOINT
:
638 /* Event will be enabled by enabler sync. */
640 event
->registered
= 0;
641 event
->desc
= lttng_event_get(event_name
);
646 /* Populate lttng_event structure before event registration. */
649 case LTTNG_KERNEL_KPROBE
:
651 * Needs to be explicitly enabled after creation, since
652 * we may want to apply filters.
655 event
->registered
= 1;
657 * Populate lttng_event structure before event
661 ret
= lttng_kprobes_register(event_name
,
662 event_param
->u
.kprobe
.symbol_name
,
663 event_param
->u
.kprobe
.offset
,
664 event_param
->u
.kprobe
.addr
,
670 ret
= try_module_get(event
->desc
->owner
);
673 case LTTNG_KERNEL_KRETPROBE
:
675 struct lttng_event
*event_return
;
677 /* kretprobe defines 2 events */
679 * Needs to be explicitly enabled after creation, since
680 * we may want to apply filters.
683 event
->registered
= 1;
685 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
690 event_return
->chan
= chan
;
691 event_return
->filter
= filter
;
692 event_return
->id
= chan
->free_event_id
++;
693 event_return
->enabled
= 0;
694 event_return
->registered
= 1;
695 event_return
->instrumentation
= itype
;
697 * Populate lttng_event structure before kretprobe registration.
700 ret
= lttng_kretprobes_register(event_name
,
701 event_param
->u
.kretprobe
.symbol_name
,
702 event_param
->u
.kretprobe
.offset
,
703 event_param
->u
.kretprobe
.addr
,
704 event
, event_return
);
706 kmem_cache_free(event_cache
, event_return
);
710 /* Take 2 refs on the module: one per event. */
711 ret
= try_module_get(event
->desc
->owner
);
713 ret
= try_module_get(event
->desc
->owner
);
715 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
717 WARN_ON_ONCE(ret
> 0);
719 kmem_cache_free(event_cache
, event_return
);
720 module_put(event
->desc
->owner
);
721 module_put(event
->desc
->owner
);
722 goto statedump_error
;
724 list_add(&event_return
->list
, &chan
->session
->events
);
727 case LTTNG_KERNEL_FUNCTION
:
729 * Needs to be explicitly enabled after creation, since
730 * we may want to apply filters.
733 event
->registered
= 1;
735 * Populate lttng_event structure before event
739 ret
= lttng_ftrace_register(event_name
,
740 event_param
->u
.ftrace
.symbol_name
,
745 ret
= try_module_get(event
->desc
->owner
);
748 case LTTNG_KERNEL_NOOP
:
749 case LTTNG_KERNEL_SYSCALL
:
751 * Needs to be explicitly enabled after creation, since
752 * we may want to apply filters.
755 event
->registered
= 0;
756 event
->desc
= event_desc
;
767 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
768 WARN_ON_ONCE(ret
> 0);
770 goto statedump_error
;
772 hlist_add_head(&event
->hlist
, head
);
773 list_add(&event
->list
, &chan
->session
->events
);
777 /* If a statedump error occurs, events will not be readable. */
779 kmem_cache_free(event_cache
, event
);
787 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
788 struct lttng_kernel_event
*event_param
,
790 const struct lttng_event_desc
*event_desc
,
791 enum lttng_kernel_instrumentation itype
)
793 struct lttng_event
*event
;
795 mutex_lock(&sessions_mutex
);
796 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
798 mutex_unlock(&sessions_mutex
);
802 /* Only used for tracepoints for now. */
804 void register_event(struct lttng_event
*event
)
806 const struct lttng_event_desc
*desc
;
809 if (event
->registered
)
813 switch (event
->instrumentation
) {
814 case LTTNG_KERNEL_TRACEPOINT
:
815 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
816 desc
->probe_callback
,
819 case LTTNG_KERNEL_SYSCALL
:
820 ret
= lttng_syscall_filter_enable(event
->chan
,
823 case LTTNG_KERNEL_KPROBE
:
824 case LTTNG_KERNEL_KRETPROBE
:
825 case LTTNG_KERNEL_FUNCTION
:
826 case LTTNG_KERNEL_NOOP
:
833 event
->registered
= 1;
837 * Only used internally at session destruction.
839 int _lttng_event_unregister(struct lttng_event
*event
)
841 const struct lttng_event_desc
*desc
;
844 if (!event
->registered
)
848 switch (event
->instrumentation
) {
849 case LTTNG_KERNEL_TRACEPOINT
:
850 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
851 event
->desc
->probe_callback
,
854 case LTTNG_KERNEL_KPROBE
:
855 lttng_kprobes_unregister(event
);
858 case LTTNG_KERNEL_KRETPROBE
:
859 lttng_kretprobes_unregister(event
);
862 case LTTNG_KERNEL_FUNCTION
:
863 lttng_ftrace_unregister(event
);
866 case LTTNG_KERNEL_SYSCALL
:
867 ret
= lttng_syscall_filter_disable(event
->chan
,
870 case LTTNG_KERNEL_NOOP
:
877 event
->registered
= 0;
882 * Only used internally at session destruction.
885 void _lttng_event_destroy(struct lttng_event
*event
)
887 switch (event
->instrumentation
) {
888 case LTTNG_KERNEL_TRACEPOINT
:
889 lttng_event_put(event
->desc
);
891 case LTTNG_KERNEL_KPROBE
:
892 module_put(event
->desc
->owner
);
893 lttng_kprobes_destroy_private(event
);
895 case LTTNG_KERNEL_KRETPROBE
:
896 module_put(event
->desc
->owner
);
897 lttng_kretprobes_destroy_private(event
);
899 case LTTNG_KERNEL_FUNCTION
:
900 module_put(event
->desc
->owner
);
901 lttng_ftrace_destroy_private(event
);
903 case LTTNG_KERNEL_NOOP
:
904 case LTTNG_KERNEL_SYSCALL
:
909 list_del(&event
->list
);
910 lttng_destroy_context(event
->ctx
);
911 kmem_cache_free(event_cache
, event
);
914 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
920 mutex_lock(&sessions_mutex
);
922 /* track all pids: destroy tracker. */
923 if (session
->pid_tracker
) {
924 struct lttng_pid_tracker
*lpf
;
926 lpf
= session
->pid_tracker
;
927 rcu_assign_pointer(session
->pid_tracker
, NULL
);
929 lttng_pid_tracker_destroy(lpf
);
933 if (!session
->pid_tracker
) {
934 struct lttng_pid_tracker
*lpf
;
936 lpf
= lttng_pid_tracker_create();
941 ret
= lttng_pid_tracker_add(lpf
, pid
);
942 rcu_assign_pointer(session
->pid_tracker
, lpf
);
944 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
948 mutex_unlock(&sessions_mutex
);
952 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
958 mutex_lock(&sessions_mutex
);
960 /* untrack all pids: replace by empty tracker. */
961 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
962 struct lttng_pid_tracker
*lpf
;
964 lpf
= lttng_pid_tracker_create();
969 rcu_assign_pointer(session
->pid_tracker
, lpf
);
972 lttng_pid_tracker_destroy(old_lpf
);
975 if (!session
->pid_tracker
) {
979 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
982 mutex_unlock(&sessions_mutex
);
987 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
989 struct lttng_session
*session
= m
->private;
990 struct lttng_pid_tracker
*lpf
;
991 struct lttng_pid_hash_node
*e
;
994 mutex_lock(&sessions_mutex
);
995 lpf
= session
->pid_tracker
;
997 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
998 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1000 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1006 /* PID tracker disabled. */
1007 if (iter
>= *pos
&& iter
== 0) {
1008 return session
; /* empty tracker */
1016 /* Called with sessions_mutex held. */
1018 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1020 struct lttng_session
*session
= m
->private;
1021 struct lttng_pid_tracker
*lpf
;
1022 struct lttng_pid_hash_node
*e
;
1026 lpf
= session
->pid_tracker
;
1028 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1029 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1031 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1032 if (iter
++ >= *ppos
)
1037 /* PID tracker disabled. */
1038 if (iter
>= *ppos
&& iter
== 0)
1039 return session
; /* empty tracker */
1048 void pid_list_stop(struct seq_file
*m
, void *p
)
1050 mutex_unlock(&sessions_mutex
);
1054 int pid_list_show(struct seq_file
*m
, void *p
)
1058 if (p
== m
->private) {
1059 /* Tracker disabled. */
1062 const struct lttng_pid_hash_node
*e
= p
;
1064 pid
= lttng_pid_tracker_get_node_pid(e
);
1066 seq_printf(m
, "process { pid = %d; };\n", pid
);
1071 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1072 .start
= pid_list_start
,
1073 .next
= pid_list_next
,
1074 .stop
= pid_list_stop
,
1075 .show
= pid_list_show
,
1079 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1081 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1085 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1087 struct seq_file
*m
= file
->private_data
;
1088 struct lttng_session
*session
= m
->private;
1091 WARN_ON_ONCE(!session
);
1092 ret
= seq_release(inode
, file
);
1093 if (!ret
&& session
)
1094 fput(session
->file
);
1098 const struct file_operations lttng_tracker_pids_list_fops
= {
1099 .owner
= THIS_MODULE
,
1100 .open
= lttng_tracker_pids_list_open
,
1102 .llseek
= seq_lseek
,
1103 .release
= lttng_tracker_pids_list_release
,
1106 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1108 struct file
*tracker_pids_list_file
;
1112 file_fd
= lttng_get_unused_fd();
1118 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1119 <tng_tracker_pids_list_fops
,
1121 if (IS_ERR(tracker_pids_list_file
)) {
1122 ret
= PTR_ERR(tracker_pids_list_file
);
1125 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1127 goto refcount_error
;
1129 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1132 m
= tracker_pids_list_file
->private_data
;
1133 m
->private = session
;
1134 fd_install(file_fd
, tracker_pids_list_file
);
1139 atomic_long_dec(&session
->file
->f_count
);
1141 fput(tracker_pids_list_file
);
1143 put_unused_fd(file_fd
);
1149 * Enabler management.
1152 int lttng_match_enabler_star_glob(const char *desc_name
,
1153 const char *pattern
)
1155 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1156 desc_name
, LTTNG_SIZE_MAX
))
1162 int lttng_match_enabler_name(const char *desc_name
,
1165 if (strcmp(desc_name
, name
))
1171 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1172 struct lttng_enabler
*enabler
)
1174 const char *desc_name
, *enabler_name
;
1176 enabler_name
= enabler
->event_param
.name
;
1177 switch (enabler
->event_param
.instrumentation
) {
1178 case LTTNG_KERNEL_TRACEPOINT
:
1179 desc_name
= desc
->name
;
1181 case LTTNG_KERNEL_SYSCALL
:
1182 desc_name
= desc
->name
;
1183 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1184 desc_name
+= strlen("compat_");
1185 if (!strncmp(desc_name
, "syscall_exit_",
1186 strlen("syscall_exit_"))) {
1187 desc_name
+= strlen("syscall_exit_");
1188 } else if (!strncmp(desc_name
, "syscall_entry_",
1189 strlen("syscall_entry_"))) {
1190 desc_name
+= strlen("syscall_entry_");
1200 switch (enabler
->type
) {
1201 case LTTNG_ENABLER_STAR_GLOB
:
1202 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1203 case LTTNG_ENABLER_NAME
:
1204 return lttng_match_enabler_name(desc_name
, enabler_name
);
1211 int lttng_event_match_enabler(struct lttng_event
*event
,
1212 struct lttng_enabler
*enabler
)
1214 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1216 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1217 && event
->chan
== enabler
->chan
)
1224 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1225 struct lttng_enabler
*enabler
)
1227 struct lttng_enabler_ref
*enabler_ref
;
1229 list_for_each_entry(enabler_ref
,
1230 &event
->enablers_ref_head
, node
) {
1231 if (enabler_ref
->ref
== enabler
)
1238 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1240 struct lttng_session
*session
= enabler
->chan
->session
;
1241 struct lttng_probe_desc
*probe_desc
;
1242 const struct lttng_event_desc
*desc
;
1244 struct list_head
*probe_list
;
1246 probe_list
= lttng_get_probe_list_head();
1248 * For each probe event, if we find that a probe event matches
1249 * our enabler, create an associated lttng_event if not
1252 list_for_each_entry(probe_desc
, probe_list
, head
) {
1253 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1255 struct hlist_head
*head
;
1256 const char *event_name
;
1259 struct lttng_event
*event
;
1261 desc
= probe_desc
->event_desc
[i
];
1262 if (!lttng_desc_match_enabler(desc
, enabler
))
1264 event_name
= desc
->name
;
1265 name_len
= strlen(event_name
);
1268 * Check if already created.
1270 hash
= jhash(event_name
, name_len
, 0);
1271 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1272 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1273 if (event
->desc
== desc
1274 && event
->chan
== enabler
->chan
)
1281 * We need to create an event for this
1284 event
= _lttng_event_create(enabler
->chan
,
1286 LTTNG_KERNEL_TRACEPOINT
);
1288 printk(KERN_INFO
"Unable to create event %s\n",
1289 probe_desc
->event_desc
[i
]->name
);
1296 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1300 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1305 * Create struct lttng_event if it is missing and present in the list of
1306 * tracepoint probes.
1307 * Should be called with sessions mutex held.
1310 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1312 switch (enabler
->event_param
.instrumentation
) {
1313 case LTTNG_KERNEL_TRACEPOINT
:
1314 lttng_create_tracepoint_if_missing(enabler
);
1316 case LTTNG_KERNEL_SYSCALL
:
1317 lttng_create_syscall_if_missing(enabler
);
1326 * Create events associated with an enabler (if not already present),
1327 * and add backward reference from the event to the enabler.
1328 * Should be called with sessions mutex held.
1331 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1333 struct lttng_session
*session
= enabler
->chan
->session
;
1334 struct lttng_event
*event
;
1336 /* First ensure that probe events are created for this enabler. */
1337 lttng_create_event_if_missing(enabler
);
1339 /* For each event matching enabler in session event list. */
1340 list_for_each_entry(event
, &session
->events
, list
) {
1341 struct lttng_enabler_ref
*enabler_ref
;
1343 if (!lttng_event_match_enabler(event
, enabler
))
1345 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1348 * If no backward ref, create it.
1349 * Add backward ref from event to enabler.
1351 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1354 enabler_ref
->ref
= enabler
;
1355 list_add(&enabler_ref
->node
,
1356 &event
->enablers_ref_head
);
1360 * Link filter bytecodes if not linked yet.
1362 lttng_enabler_event_link_bytecode(event
, enabler
);
1364 /* TODO: merge event context. */
1370 * Called at module load: connect the probe on all enablers matching
1372 * Called with sessions lock held.
1374 int lttng_fix_pending_events(void)
1376 struct lttng_session
*session
;
1378 list_for_each_entry(session
, &sessions
, list
)
1379 lttng_session_lazy_sync_enablers(session
);
1383 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1384 struct lttng_kernel_event
*event_param
,
1385 struct lttng_channel
*chan
)
1387 struct lttng_enabler
*enabler
;
1389 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1392 enabler
->type
= type
;
1393 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1394 memcpy(&enabler
->event_param
, event_param
,
1395 sizeof(enabler
->event_param
));
1396 enabler
->chan
= chan
;
1398 enabler
->enabled
= 0;
1399 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1400 mutex_lock(&sessions_mutex
);
1401 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1402 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1403 mutex_unlock(&sessions_mutex
);
1407 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1409 mutex_lock(&sessions_mutex
);
1410 enabler
->enabled
= 1;
1411 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1412 mutex_unlock(&sessions_mutex
);
1416 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1418 mutex_lock(&sessions_mutex
);
1419 enabler
->enabled
= 0;
1420 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1421 mutex_unlock(&sessions_mutex
);
1425 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1426 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1428 struct lttng_filter_bytecode_node
*bytecode_node
;
1429 uint32_t bytecode_len
;
1432 ret
= get_user(bytecode_len
, &bytecode
->len
);
1435 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1439 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1440 sizeof(*bytecode
) + bytecode_len
);
1443 bytecode_node
->enabler
= enabler
;
1444 /* Enforce length based on allocated size */
1445 bytecode_node
->bc
.len
= bytecode_len
;
1446 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1447 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1451 kfree(bytecode_node
);
1455 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1456 struct lttng_kernel_context
*context_param
)
1462 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1464 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1466 /* Destroy filter bytecode */
1467 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1468 &enabler
->filter_bytecode_head
, node
) {
1472 /* Destroy contexts */
1473 lttng_destroy_context(enabler
->ctx
);
1475 list_del(&enabler
->node
);
1480 * lttng_session_sync_enablers should be called just before starting a
1482 * Should be called with sessions mutex held.
1485 void lttng_session_sync_enablers(struct lttng_session
*session
)
1487 struct lttng_enabler
*enabler
;
1488 struct lttng_event
*event
;
1490 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1491 lttng_enabler_ref_events(enabler
);
1493 * For each event, if at least one of its enablers is enabled,
1494 * and its channel and session transient states are enabled, we
1495 * enable the event, else we disable it.
1497 list_for_each_entry(event
, &session
->events
, list
) {
1498 struct lttng_enabler_ref
*enabler_ref
;
1499 struct lttng_bytecode_runtime
*runtime
;
1500 int enabled
= 0, has_enablers_without_bytecode
= 0;
1502 switch (event
->instrumentation
) {
1503 case LTTNG_KERNEL_TRACEPOINT
:
1504 case LTTNG_KERNEL_SYSCALL
:
1506 list_for_each_entry(enabler_ref
,
1507 &event
->enablers_ref_head
, node
) {
1508 if (enabler_ref
->ref
->enabled
) {
1515 /* Not handled with lazy sync. */
1519 * Enabled state is based on union of enablers, with
1520 * intesection of session and channel transient enable
1523 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1525 WRITE_ONCE(event
->enabled
, enabled
);
1527 * Sync tracepoint registration with event enabled
1531 register_event(event
);
1533 _lttng_event_unregister(event
);
1536 /* Check if has enablers without bytecode enabled */
1537 list_for_each_entry(enabler_ref
,
1538 &event
->enablers_ref_head
, node
) {
1539 if (enabler_ref
->ref
->enabled
1540 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1541 has_enablers_without_bytecode
= 1;
1545 event
->has_enablers_without_bytecode
=
1546 has_enablers_without_bytecode
;
1548 /* Enable filters */
1549 list_for_each_entry(runtime
,
1550 &event
->bytecode_runtime_head
, node
)
1551 lttng_filter_sync_state(runtime
);
1556 * Apply enablers to session events, adding events to session if need
1557 * be. It is required after each modification applied to an active
1558 * session, and right before session "start".
1559 * "lazy" sync means we only sync if required.
1560 * Should be called with sessions mutex held.
1563 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1565 /* We can skip if session is not active */
1566 if (!session
->active
)
1568 lttng_session_sync_enablers(session
);
1572 * Serialize at most one packet worth of metadata into a metadata
1574 * We grab the metadata cache mutex to get exclusive access to our metadata
1575 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1576 * allows us to do racy operations such as looking for remaining space left in
1577 * packet and write, since mutual exclusion protects us from concurrent writes.
1578 * Mutual exclusion on the metadata cache allow us to read the cache content
1579 * without racing against reallocation of the cache by updates.
1580 * Returns the number of bytes written in the channel, 0 if no data
1581 * was written and a negative value on error.
1583 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1584 struct channel
*chan
)
1586 struct lib_ring_buffer_ctx ctx
;
1588 size_t len
, reserve_len
;
1591 * Ensure we support mutiple get_next / put sequences followed by
1592 * put_next. The metadata cache lock protects reading the metadata
1593 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1594 * "flush" operations on the buffer invoked by different processes.
1595 * Moreover, since the metadata cache memory can be reallocated, we
1596 * need to have exclusive access against updates even though we only
1599 mutex_lock(&stream
->metadata_cache
->lock
);
1600 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1601 if (stream
->metadata_in
!= stream
->metadata_out
)
1604 /* Metadata regenerated, change the version. */
1605 if (stream
->metadata_cache
->version
!= stream
->version
)
1606 stream
->version
= stream
->metadata_cache
->version
;
1608 len
= stream
->metadata_cache
->metadata_written
-
1609 stream
->metadata_in
;
1612 reserve_len
= min_t(size_t,
1613 stream
->transport
->ops
.packet_avail_size(chan
),
1615 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1618 * If reservation failed, return an error to the caller.
1620 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1622 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1625 stream
->transport
->ops
.event_write(&ctx
,
1626 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1628 stream
->transport
->ops
.event_commit(&ctx
);
1629 stream
->metadata_in
+= reserve_len
;
1633 mutex_unlock(&stream
->metadata_cache
->lock
);
1638 * Write the metadata to the metadata cache.
1639 * Must be called with sessions_mutex held.
1640 * The metadata cache lock protects us from concurrent read access from
1641 * thread outputting metadata content to ring buffer.
1643 int lttng_metadata_printf(struct lttng_session
*session
,
1644 const char *fmt
, ...)
1649 struct lttng_metadata_stream
*stream
;
1651 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1654 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1660 mutex_lock(&session
->metadata_cache
->lock
);
1661 if (session
->metadata_cache
->metadata_written
+ len
>
1662 session
->metadata_cache
->cache_alloc
) {
1663 char *tmp_cache_realloc
;
1664 unsigned int tmp_cache_alloc_size
;
1666 tmp_cache_alloc_size
= max_t(unsigned int,
1667 session
->metadata_cache
->cache_alloc
+ len
,
1668 session
->metadata_cache
->cache_alloc
<< 1);
1669 tmp_cache_realloc
= lttng_vzalloc(tmp_cache_alloc_size
);
1670 if (!tmp_cache_realloc
)
1672 if (session
->metadata_cache
->data
) {
1673 memcpy(tmp_cache_realloc
,
1674 session
->metadata_cache
->data
,
1675 session
->metadata_cache
->cache_alloc
);
1676 vfree(session
->metadata_cache
->data
);
1679 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1680 session
->metadata_cache
->data
= tmp_cache_realloc
;
1682 memcpy(session
->metadata_cache
->data
+
1683 session
->metadata_cache
->metadata_written
,
1685 session
->metadata_cache
->metadata_written
+= len
;
1686 mutex_unlock(&session
->metadata_cache
->lock
);
1689 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1690 wake_up_interruptible(&stream
->read_wait
);
1695 mutex_unlock(&session
->metadata_cache
->lock
);
1701 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1705 for (i
= 0; i
< nesting
; i
++) {
1708 ret
= lttng_metadata_printf(session
, " ");
1717 * Must be called with sessions_mutex held.
1720 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1721 const struct lttng_type
*type
,
1725 uint32_t i
, nr_fields
;
1727 ret
= print_tabs(session
, nesting
);
1730 ret
= lttng_metadata_printf(session
,
1734 nr_fields
= type
->u
._struct
.nr_fields
;
1735 for (i
= 0; i
< nr_fields
; i
++) {
1736 const struct lttng_event_field
*iter_field
;
1738 iter_field
= &type
->u
._struct
.fields
[i
];
1739 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1743 ret
= print_tabs(session
, nesting
);
1746 ret
= lttng_metadata_printf(session
,
1752 * Must be called with sessions_mutex held.
1755 int _lttng_struct_statedump(struct lttng_session
*session
,
1756 const struct lttng_event_field
*field
,
1761 ret
= _lttng_struct_type_statedump(session
,
1762 &field
->type
, nesting
);
1765 ret
= lttng_metadata_printf(session
,
1772 * Must be called with sessions_mutex held.
1775 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1776 const struct lttng_type
*type
,
1780 uint32_t i
, nr_choices
;
1782 ret
= print_tabs(session
, nesting
);
1785 ret
= lttng_metadata_printf(session
,
1786 "variant <_%s> {\n",
1787 type
->u
.variant
.tag_name
);
1790 nr_choices
= type
->u
.variant
.nr_choices
;
1791 for (i
= 0; i
< nr_choices
; i
++) {
1792 const struct lttng_event_field
*iter_field
;
1794 iter_field
= &type
->u
.variant
.choices
[i
];
1795 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1799 ret
= print_tabs(session
, nesting
);
1802 ret
= lttng_metadata_printf(session
,
1808 * Must be called with sessions_mutex held.
1811 int _lttng_variant_statedump(struct lttng_session
*session
,
1812 const struct lttng_event_field
*field
,
1817 ret
= _lttng_variant_type_statedump(session
,
1818 &field
->type
, nesting
);
1821 ret
= lttng_metadata_printf(session
,
1828 * Must be called with sessions_mutex held.
1831 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1832 const struct lttng_event_field
*field
,
1836 const struct lttng_type
*elem_type
;
1838 /* Only array of structures and variants are currently supported. */
1839 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1840 switch (elem_type
->atype
) {
1842 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1847 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1854 ret
= lttng_metadata_printf(session
,
1857 field
->type
.u
.array_compound
.length
);
1862 * Must be called with sessions_mutex held.
1865 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1866 const struct lttng_event_field
*field
,
1870 const char *length_name
;
1871 const struct lttng_type
*elem_type
;
1873 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1875 /* Only array of structures and variants are currently supported. */
1876 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1877 switch (elem_type
->atype
) {
1879 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1884 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1891 ret
= lttng_metadata_printf(session
,
1899 * Must be called with sessions_mutex held.
1902 int _lttng_enum_statedump(struct lttng_session
*session
,
1903 const struct lttng_event_field
*field
,
1906 const struct lttng_enum_desc
*enum_desc
;
1907 const struct lttng_integer_type
*container_type
;
1909 unsigned int i
, nr_entries
;
1911 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1912 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1913 nr_entries
= enum_desc
->nr_entries
;
1915 ret
= print_tabs(session
, nesting
);
1918 ret
= lttng_metadata_printf(session
,
1919 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1920 container_type
->size
,
1921 container_type
->alignment
,
1922 container_type
->signedness
,
1923 (container_type
->encoding
== lttng_encode_none
)
1925 : (container_type
->encoding
== lttng_encode_UTF8
)
1928 container_type
->base
,
1929 #if __BYTE_ORDER == __BIG_ENDIAN
1930 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1932 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1937 /* Dump all entries */
1938 for (i
= 0; i
< nr_entries
; i
++) {
1939 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1942 ret
= print_tabs(session
, nesting
+ 1);
1945 ret
= lttng_metadata_printf(session
,
1949 len
= strlen(entry
->string
);
1950 /* Escape the character '"' */
1951 for (j
= 0; j
< len
; j
++) {
1952 char c
= entry
->string
[j
];
1956 ret
= lttng_metadata_printf(session
,
1960 ret
= lttng_metadata_printf(session
,
1964 ret
= lttng_metadata_printf(session
,
1971 ret
= lttng_metadata_printf(session
, "\"");
1975 if (entry
->options
.is_auto
) {
1976 ret
= lttng_metadata_printf(session
, ",\n");
1980 ret
= lttng_metadata_printf(session
,
1984 if (entry
->start
.signedness
)
1985 ret
= lttng_metadata_printf(session
,
1986 "%lld", (long long) entry
->start
.value
);
1988 ret
= lttng_metadata_printf(session
,
1989 "%llu", entry
->start
.value
);
1992 if (entry
->start
.signedness
== entry
->end
.signedness
&&
1994 == entry
->end
.value
) {
1995 ret
= lttng_metadata_printf(session
,
1998 if (entry
->end
.signedness
) {
1999 ret
= lttng_metadata_printf(session
,
2001 (long long) entry
->end
.value
);
2003 ret
= lttng_metadata_printf(session
,
2012 ret
= print_tabs(session
, nesting
);
2015 ret
= lttng_metadata_printf(session
, "} _%s;\n",
2022 * Must be called with sessions_mutex held.
2025 int _lttng_field_statedump(struct lttng_session
*session
,
2026 const struct lttng_event_field
*field
,
2031 switch (field
->type
.atype
) {
2033 ret
= print_tabs(session
, nesting
);
2036 ret
= lttng_metadata_printf(session
,
2037 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2038 field
->type
.u
.basic
.integer
.size
,
2039 field
->type
.u
.basic
.integer
.alignment
,
2040 field
->type
.u
.basic
.integer
.signedness
,
2041 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2043 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2046 field
->type
.u
.basic
.integer
.base
,
2047 #if __BYTE_ORDER == __BIG_ENDIAN
2048 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2050 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2055 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2059 const struct lttng_basic_type
*elem_type
;
2061 elem_type
= &field
->type
.u
.array
.elem_type
;
2062 if (field
->type
.u
.array
.elem_alignment
) {
2063 ret
= print_tabs(session
, nesting
);
2066 ret
= lttng_metadata_printf(session
,
2067 "struct { } align(%u) _%s_padding;\n",
2068 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2073 ret
= print_tabs(session
, nesting
);
2076 ret
= lttng_metadata_printf(session
,
2077 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2078 elem_type
->u
.basic
.integer
.size
,
2079 elem_type
->u
.basic
.integer
.alignment
,
2080 elem_type
->u
.basic
.integer
.signedness
,
2081 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2083 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2086 elem_type
->u
.basic
.integer
.base
,
2087 #if __BYTE_ORDER == __BIG_ENDIAN
2088 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2090 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2092 field
->name
, field
->type
.u
.array
.length
);
2095 case atype_sequence
:
2097 const struct lttng_basic_type
*elem_type
;
2098 const struct lttng_basic_type
*length_type
;
2100 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2101 length_type
= &field
->type
.u
.sequence
.length_type
;
2102 ret
= print_tabs(session
, nesting
);
2105 ret
= lttng_metadata_printf(session
,
2106 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2107 length_type
->u
.basic
.integer
.size
,
2108 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2109 length_type
->u
.basic
.integer
.signedness
,
2110 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2112 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2115 length_type
->u
.basic
.integer
.base
,
2116 #if __BYTE_ORDER == __BIG_ENDIAN
2117 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2119 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2125 if (field
->type
.u
.sequence
.elem_alignment
) {
2126 ret
= print_tabs(session
, nesting
);
2129 ret
= lttng_metadata_printf(session
,
2130 "struct { } align(%u) _%s_padding;\n",
2131 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2136 ret
= print_tabs(session
, nesting
);
2139 ret
= lttng_metadata_printf(session
,
2140 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2141 elem_type
->u
.basic
.integer
.size
,
2142 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2143 elem_type
->u
.basic
.integer
.signedness
,
2144 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2146 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2149 elem_type
->u
.basic
.integer
.base
,
2150 #if __BYTE_ORDER == __BIG_ENDIAN
2151 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2153 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2161 /* Default encoding is UTF8 */
2162 ret
= print_tabs(session
, nesting
);
2165 ret
= lttng_metadata_printf(session
,
2167 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2168 " { encoding = ASCII; }" : "",
2172 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2174 case atype_array_compound
:
2175 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2177 case atype_sequence_compound
:
2178 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2181 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2192 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2193 struct lttng_ctx
*ctx
)
2200 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2201 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2203 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2211 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2212 struct lttng_event
*event
)
2214 const struct lttng_event_desc
*desc
= event
->desc
;
2218 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2219 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2221 ret
= _lttng_field_statedump(session
, field
, 2);
2229 * Must be called with sessions_mutex held.
2232 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2233 struct lttng_channel
*chan
,
2234 struct lttng_event
*event
)
2238 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2240 if (chan
->channel_type
== METADATA_CHANNEL
)
2243 ret
= lttng_metadata_printf(session
,
2247 " stream_id = %u;\n",
2255 ret
= lttng_metadata_printf(session
,
2256 " context := struct {\n");
2260 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2264 ret
= lttng_metadata_printf(session
,
2270 ret
= lttng_metadata_printf(session
,
2271 " fields := struct {\n"
2276 ret
= _lttng_fields_metadata_statedump(session
, event
);
2281 * LTTng space reservation can only reserve multiples of the
2284 ret
= lttng_metadata_printf(session
,
2290 event
->metadata_dumped
= 1;
2297 * Must be called with sessions_mutex held.
2300 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2301 struct lttng_channel
*chan
)
2305 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2308 if (chan
->channel_type
== METADATA_CHANNEL
)
2311 WARN_ON_ONCE(!chan
->header_type
);
2312 ret
= lttng_metadata_printf(session
,
2315 " event.header := %s;\n"
2316 " packet.context := struct packet_context;\n",
2318 chan
->header_type
== 1 ? "struct event_header_compact" :
2319 "struct event_header_large");
2324 ret
= lttng_metadata_printf(session
,
2325 " event.context := struct {\n");
2329 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2333 ret
= lttng_metadata_printf(session
,
2339 ret
= lttng_metadata_printf(session
,
2342 chan
->metadata_dumped
= 1;
2348 * Must be called with sessions_mutex held.
2351 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2353 return lttng_metadata_printf(session
,
2354 "struct packet_context {\n"
2355 " uint64_clock_monotonic_t timestamp_begin;\n"
2356 " uint64_clock_monotonic_t timestamp_end;\n"
2357 " uint64_t content_size;\n"
2358 " uint64_t packet_size;\n"
2359 " uint64_t packet_seq_num;\n"
2360 " unsigned long events_discarded;\n"
2361 " uint32_t cpu_id;\n"
2368 * id: range: 0 - 30.
2369 * id 31 is reserved to indicate an extended header.
2372 * id: range: 0 - 65534.
2373 * id 65535 is reserved to indicate an extended header.
2375 * Must be called with sessions_mutex held.
2378 int _lttng_event_header_declare(struct lttng_session
*session
)
2380 return lttng_metadata_printf(session
,
2381 "struct event_header_compact {\n"
2382 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2385 " uint27_clock_monotonic_t timestamp;\n"
2389 " uint64_clock_monotonic_t timestamp;\n"
2394 "struct event_header_large {\n"
2395 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2398 " uint32_clock_monotonic_t timestamp;\n"
2402 " uint64_clock_monotonic_t timestamp;\n"
2406 lttng_alignof(uint32_t) * CHAR_BIT
,
2407 lttng_alignof(uint16_t) * CHAR_BIT
2412 * Approximation of NTP time of day to clock monotonic correlation,
2413 * taken at start of trace.
2414 * Yes, this is only an approximation. Yes, we can (and will) do better
2415 * in future versions.
2416 * This function may return a negative offset. It may happen if the
2417 * system sets the REALTIME clock to 0 after boot.
2420 int64_t measure_clock_offset(void)
2422 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2423 uint64_t tcf
= trace_clock_freq();
2425 struct timespec rts
= { 0, 0 };
2426 unsigned long flags
;
2428 /* Disable interrupts to increase correlation precision. */
2429 local_irq_save(flags
);
2430 monotonic
[0] = trace_clock_read64();
2431 getnstimeofday(&rts
);
2432 monotonic
[1] = trace_clock_read64();
2433 local_irq_restore(flags
);
2435 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2436 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2437 if (tcf
== NSEC_PER_SEC
) {
2438 realtime
+= rts
.tv_nsec
;
2440 uint64_t n
= rts
.tv_nsec
* tcf
;
2442 do_div(n
, NSEC_PER_SEC
);
2445 offset
= (int64_t) realtime
- monotonic_avg
;
2450 * Output metadata into this session's metadata buffers.
2451 * Must be called with sessions_mutex held.
2454 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2456 unsigned char *uuid_c
= session
->uuid
.b
;
2457 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2458 struct lttng_channel
*chan
;
2459 struct lttng_event
*event
;
2462 if (!READ_ONCE(session
->active
))
2464 if (session
->metadata_dumped
)
2467 snprintf(uuid_s
, sizeof(uuid_s
),
2468 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2469 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2470 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2471 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2472 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2474 ret
= lttng_metadata_printf(session
,
2475 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2476 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2477 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2478 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2479 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2480 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2481 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2487 " byte_order = %s;\n"
2488 " packet.header := struct {\n"
2489 " uint32_t magic;\n"
2490 " uint8_t uuid[16];\n"
2491 " uint32_t stream_id;\n"
2492 " uint64_t stream_instance_id;\n"
2495 lttng_alignof(uint8_t) * CHAR_BIT
,
2496 lttng_alignof(uint16_t) * CHAR_BIT
,
2497 lttng_alignof(uint32_t) * CHAR_BIT
,
2498 lttng_alignof(uint64_t) * CHAR_BIT
,
2499 sizeof(unsigned long) * CHAR_BIT
,
2500 lttng_alignof(unsigned long) * CHAR_BIT
,
2504 #if __BYTE_ORDER == __BIG_ENDIAN
2513 ret
= lttng_metadata_printf(session
,
2515 " hostname = \"%s\";\n"
2516 " domain = \"kernel\";\n"
2517 " sysname = \"%s\";\n"
2518 " kernel_release = \"%s\";\n"
2519 " kernel_version = \"%s\";\n"
2520 " tracer_name = \"lttng-modules\";\n"
2521 " tracer_major = %d;\n"
2522 " tracer_minor = %d;\n"
2523 " tracer_patchlevel = %d;\n"
2525 current
->nsproxy
->uts_ns
->name
.nodename
,
2529 LTTNG_MODULES_MAJOR_VERSION
,
2530 LTTNG_MODULES_MINOR_VERSION
,
2531 LTTNG_MODULES_PATCHLEVEL_VERSION
2536 ret
= lttng_metadata_printf(session
,
2538 " name = \"%s\";\n",
2544 if (!trace_clock_uuid(clock_uuid_s
)) {
2545 ret
= lttng_metadata_printf(session
,
2546 " uuid = \"%s\";\n",
2553 ret
= lttng_metadata_printf(session
,
2554 " description = \"%s\";\n"
2555 " freq = %llu; /* Frequency, in Hz */\n"
2556 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2559 trace_clock_description(),
2560 (unsigned long long) trace_clock_freq(),
2561 (long long) measure_clock_offset()
2566 ret
= lttng_metadata_printf(session
,
2567 "typealias integer {\n"
2568 " size = 27; align = 1; signed = false;\n"
2569 " map = clock.%s.value;\n"
2570 "} := uint27_clock_monotonic_t;\n"
2572 "typealias integer {\n"
2573 " size = 32; align = %u; signed = false;\n"
2574 " map = clock.%s.value;\n"
2575 "} := uint32_clock_monotonic_t;\n"
2577 "typealias integer {\n"
2578 " size = 64; align = %u; signed = false;\n"
2579 " map = clock.%s.value;\n"
2580 "} := uint64_clock_monotonic_t;\n\n",
2582 lttng_alignof(uint32_t) * CHAR_BIT
,
2584 lttng_alignof(uint64_t) * CHAR_BIT
,
2590 ret
= _lttng_stream_packet_context_declare(session
);
2594 ret
= _lttng_event_header_declare(session
);
2599 list_for_each_entry(chan
, &session
->chan
, list
) {
2600 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2605 list_for_each_entry(event
, &session
->events
, list
) {
2606 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2610 session
->metadata_dumped
= 1;
2616 * lttng_transport_register - LTT transport registration
2617 * @transport: transport structure
2619 * Registers a transport which can be used as output to extract the data out of
2620 * LTTng. The module calling this registration function must ensure that no
2621 * trap-inducing code will be executed by the transport functions. E.g.
2622 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2623 * is made visible to the transport function. This registration acts as a
2624 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2625 * after its registration must it synchronize the TLBs.
2627 void lttng_transport_register(struct lttng_transport
*transport
)
2630 * Make sure no page fault can be triggered by the module about to be
2631 * registered. We deal with this here so we don't have to call
2632 * vmalloc_sync_all() in each module's init.
2634 wrapper_vmalloc_sync_all();
2636 mutex_lock(&sessions_mutex
);
2637 list_add_tail(&transport
->node
, <tng_transport_list
);
2638 mutex_unlock(&sessions_mutex
);
2640 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2643 * lttng_transport_unregister - LTT transport unregistration
2644 * @transport: transport structure
2646 void lttng_transport_unregister(struct lttng_transport
*transport
)
2648 mutex_lock(&sessions_mutex
);
2649 list_del(&transport
->node
);
2650 mutex_unlock(&sessions_mutex
);
2652 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2654 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2656 enum cpuhp_state lttng_hp_prepare
;
2657 enum cpuhp_state lttng_hp_online
;
2659 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2661 struct lttng_cpuhp_node
*lttng_node
;
2663 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2664 switch (lttng_node
->component
) {
2665 case LTTNG_RING_BUFFER_FRONTEND
:
2667 case LTTNG_RING_BUFFER_BACKEND
:
2668 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2669 case LTTNG_RING_BUFFER_ITER
:
2671 case LTTNG_CONTEXT_PERF_COUNTERS
:
2678 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2680 struct lttng_cpuhp_node
*lttng_node
;
2682 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2683 switch (lttng_node
->component
) {
2684 case LTTNG_RING_BUFFER_FRONTEND
:
2685 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2686 case LTTNG_RING_BUFFER_BACKEND
:
2688 case LTTNG_RING_BUFFER_ITER
:
2690 case LTTNG_CONTEXT_PERF_COUNTERS
:
2691 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2697 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2699 struct lttng_cpuhp_node
*lttng_node
;
2701 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2702 switch (lttng_node
->component
) {
2703 case LTTNG_RING_BUFFER_FRONTEND
:
2704 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2705 case LTTNG_RING_BUFFER_BACKEND
:
2707 case LTTNG_RING_BUFFER_ITER
:
2708 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2709 case LTTNG_CONTEXT_PERF_COUNTERS
:
2710 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2716 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2718 struct lttng_cpuhp_node
*lttng_node
;
2720 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2721 switch (lttng_node
->component
) {
2722 case LTTNG_RING_BUFFER_FRONTEND
:
2723 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2724 case LTTNG_RING_BUFFER_BACKEND
:
2726 case LTTNG_RING_BUFFER_ITER
:
2728 case LTTNG_CONTEXT_PERF_COUNTERS
:
2735 static int __init
lttng_init_cpu_hotplug(void)
2739 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2740 lttng_hotplug_prepare
,
2741 lttng_hotplug_dead
);
2745 lttng_hp_prepare
= ret
;
2746 lttng_rb_set_hp_prepare(ret
);
2748 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2749 lttng_hotplug_online
,
2750 lttng_hotplug_offline
);
2752 cpuhp_remove_multi_state(lttng_hp_prepare
);
2753 lttng_hp_prepare
= 0;
2756 lttng_hp_online
= ret
;
2757 lttng_rb_set_hp_online(ret
);
2762 static void __exit
lttng_exit_cpu_hotplug(void)
2764 lttng_rb_set_hp_online(0);
2765 cpuhp_remove_multi_state(lttng_hp_online
);
2766 lttng_rb_set_hp_prepare(0);
2767 cpuhp_remove_multi_state(lttng_hp_prepare
);
2770 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2771 static int lttng_init_cpu_hotplug(void)
2775 static void lttng_exit_cpu_hotplug(void)
2778 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2781 static int __init
lttng_events_init(void)
2785 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2788 ret
= wrapper_get_pfnblock_flags_mask_init();
2791 ret
= wrapper_get_pageblock_flags_mask_init();
2794 ret
= lttng_probes_init();
2797 ret
= lttng_context_init();
2800 ret
= lttng_tracepoint_init();
2803 event_cache
= KMEM_CACHE(lttng_event
, 0);
2808 ret
= lttng_abi_init();
2811 ret
= lttng_logger_init();
2814 ret
= lttng_init_cpu_hotplug();
2817 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2818 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2819 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2820 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2821 LTTNG_MODULES_EXTRAVERSION
,
2823 #ifdef LTTNG_EXTRA_VERSION_GIT
2824 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2828 #ifdef LTTNG_EXTRA_VERSION_NAME
2829 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2836 lttng_logger_exit();
2840 kmem_cache_destroy(event_cache
);
2842 lttng_tracepoint_exit();
2844 lttng_context_exit();
2845 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2846 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2847 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2848 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2849 LTTNG_MODULES_EXTRAVERSION
,
2851 #ifdef LTTNG_EXTRA_VERSION_GIT
2852 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2856 #ifdef LTTNG_EXTRA_VERSION_NAME
2857 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2864 module_init(lttng_events_init
);
2866 static void __exit
lttng_events_exit(void)
2868 struct lttng_session
*session
, *tmpsession
;
2870 lttng_exit_cpu_hotplug();
2871 lttng_logger_exit();
2873 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2874 lttng_session_destroy(session
);
2875 kmem_cache_destroy(event_cache
);
2876 lttng_tracepoint_exit();
2877 lttng_context_exit();
2878 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2879 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2880 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2881 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2882 LTTNG_MODULES_EXTRAVERSION
,
2884 #ifdef LTTNG_EXTRA_VERSION_GIT
2885 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2889 #ifdef LTTNG_EXTRA_VERSION_NAME
2890 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2896 module_exit(lttng_events_exit
);
2898 #include "extra_version/patches.i"
2899 #ifdef LTTNG_EXTRA_VERSION_GIT
2900 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
2902 #ifdef LTTNG_EXTRA_VERSION_NAME
2903 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
2905 MODULE_LICENSE("GPL and additional rights");
2906 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2907 MODULE_DESCRIPTION("LTTng Events");
2908 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
2909 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
2910 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
2911 LTTNG_MODULES_EXTRAVERSION
);