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>
59 #include <wrapper/time.h>
61 #define METADATA_CACHE_DEFAULT_SIZE 4096
63 static LIST_HEAD(sessions
);
64 static LIST_HEAD(lttng_transport_list
);
66 * Protect the sessions and metadata caches.
68 static DEFINE_MUTEX(sessions_mutex
);
69 static struct kmem_cache
*event_cache
;
71 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
72 static void lttng_session_sync_enablers(struct lttng_session
*session
);
73 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
75 static void _lttng_event_destroy(struct lttng_event
*event
);
76 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
77 static int _lttng_event_unregister(struct lttng_event
*event
);
79 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
80 struct lttng_channel
*chan
,
81 struct lttng_event
*event
);
83 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
85 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
87 int _lttng_field_statedump(struct lttng_session
*session
,
88 const struct lttng_event_field
*field
,
91 void synchronize_trace(void)
93 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
99 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
100 #ifdef CONFIG_PREEMPT_RT_FULL
103 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
104 #ifdef CONFIG_PREEMPT_RT
107 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
110 void lttng_lock_sessions(void)
112 mutex_lock(&sessions_mutex
);
115 void lttng_unlock_sessions(void)
117 mutex_unlock(&sessions_mutex
);
121 * Called with sessions lock held.
123 int lttng_session_active(void)
125 struct lttng_session
*iter
;
127 list_for_each_entry(iter
, &sessions
, list
) {
134 struct lttng_session
*lttng_session_create(void)
136 struct lttng_session
*session
;
137 struct lttng_metadata_cache
*metadata_cache
;
140 mutex_lock(&sessions_mutex
);
141 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
144 INIT_LIST_HEAD(&session
->chan
);
145 INIT_LIST_HEAD(&session
->events
);
146 uuid_le_gen(&session
->uuid
);
148 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
151 goto err_free_session
;
152 metadata_cache
->data
= lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
153 if (!metadata_cache
->data
)
155 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
156 kref_init(&metadata_cache
->refcount
);
157 mutex_init(&metadata_cache
->lock
);
158 session
->metadata_cache
= metadata_cache
;
159 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
160 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
161 sizeof(metadata_cache
->uuid
));
162 INIT_LIST_HEAD(&session
->enablers_head
);
163 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
164 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
165 list_add(&session
->list
, &sessions
);
166 mutex_unlock(&sessions_mutex
);
170 kfree(metadata_cache
);
172 lttng_kvfree(session
);
174 mutex_unlock(&sessions_mutex
);
178 void metadata_cache_destroy(struct kref
*kref
)
180 struct lttng_metadata_cache
*cache
=
181 container_of(kref
, struct lttng_metadata_cache
, refcount
);
186 void lttng_session_destroy(struct lttng_session
*session
)
188 struct lttng_channel
*chan
, *tmpchan
;
189 struct lttng_event
*event
, *tmpevent
;
190 struct lttng_metadata_stream
*metadata_stream
;
191 struct lttng_enabler
*enabler
, *tmpenabler
;
194 mutex_lock(&sessions_mutex
);
195 WRITE_ONCE(session
->active
, 0);
196 list_for_each_entry(chan
, &session
->chan
, list
) {
197 ret
= lttng_syscalls_unregister(chan
);
200 list_for_each_entry(event
, &session
->events
, list
) {
201 ret
= _lttng_event_unregister(event
);
204 synchronize_trace(); /* Wait for in-flight events to complete */
205 list_for_each_entry_safe(enabler
, tmpenabler
,
206 &session
->enablers_head
, node
)
207 lttng_enabler_destroy(enabler
);
208 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
209 _lttng_event_destroy(event
);
210 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
211 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
212 _lttng_channel_destroy(chan
);
214 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
215 _lttng_metadata_channel_hangup(metadata_stream
);
216 if (session
->pid_tracker
)
217 lttng_pid_tracker_destroy(session
->pid_tracker
);
218 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
219 list_del(&session
->list
);
220 mutex_unlock(&sessions_mutex
);
221 lttng_kvfree(session
);
224 int lttng_session_statedump(struct lttng_session
*session
)
228 mutex_lock(&sessions_mutex
);
229 ret
= lttng_statedump_start(session
);
230 mutex_unlock(&sessions_mutex
);
234 int lttng_session_enable(struct lttng_session
*session
)
237 struct lttng_channel
*chan
;
239 mutex_lock(&sessions_mutex
);
240 if (session
->active
) {
245 /* Set transient enabler state to "enabled" */
249 * Snapshot the number of events per channel to know the type of header
252 list_for_each_entry(chan
, &session
->chan
, list
) {
253 if (chan
->header_type
)
254 continue; /* don't change it if session stop/restart */
255 if (chan
->free_event_id
< 31)
256 chan
->header_type
= 1; /* compact */
258 chan
->header_type
= 2; /* large */
261 /* We need to sync enablers with session before activation. */
262 lttng_session_sync_enablers(session
);
264 /* Clear each stream's quiescent state. */
265 list_for_each_entry(chan
, &session
->chan
, list
) {
266 if (chan
->channel_type
!= METADATA_CHANNEL
)
267 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
270 WRITE_ONCE(session
->active
, 1);
271 WRITE_ONCE(session
->been_active
, 1);
272 ret
= _lttng_session_metadata_statedump(session
);
274 WRITE_ONCE(session
->active
, 0);
277 ret
= lttng_statedump_start(session
);
279 WRITE_ONCE(session
->active
, 0);
281 mutex_unlock(&sessions_mutex
);
285 int lttng_session_disable(struct lttng_session
*session
)
288 struct lttng_channel
*chan
;
290 mutex_lock(&sessions_mutex
);
291 if (!session
->active
) {
295 WRITE_ONCE(session
->active
, 0);
297 /* Set transient enabler state to "disabled" */
299 lttng_session_sync_enablers(session
);
301 /* Set each stream's quiescent state. */
302 list_for_each_entry(chan
, &session
->chan
, list
) {
303 if (chan
->channel_type
!= METADATA_CHANNEL
)
304 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
307 mutex_unlock(&sessions_mutex
);
311 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
314 struct lttng_channel
*chan
;
315 struct lttng_event
*event
;
316 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
317 struct lttng_metadata_stream
*stream
;
319 mutex_lock(&sessions_mutex
);
320 if (!session
->active
) {
325 mutex_lock(&cache
->lock
);
326 memset(cache
->data
, 0, cache
->cache_alloc
);
327 cache
->metadata_written
= 0;
329 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
330 stream
->metadata_out
= 0;
331 stream
->metadata_in
= 0;
333 mutex_unlock(&cache
->lock
);
335 session
->metadata_dumped
= 0;
336 list_for_each_entry(chan
, &session
->chan
, list
) {
337 chan
->metadata_dumped
= 0;
340 list_for_each_entry(event
, &session
->events
, list
) {
341 event
->metadata_dumped
= 0;
344 ret
= _lttng_session_metadata_statedump(session
);
347 mutex_unlock(&sessions_mutex
);
353 int lttng_channel_enable(struct lttng_channel
*channel
)
357 mutex_lock(&sessions_mutex
);
358 if (channel
->channel_type
== METADATA_CHANNEL
) {
362 if (channel
->enabled
) {
366 /* Set transient enabler state to "enabled" */
368 lttng_session_sync_enablers(channel
->session
);
369 /* Set atomically the state to "enabled" */
370 WRITE_ONCE(channel
->enabled
, 1);
372 mutex_unlock(&sessions_mutex
);
376 int lttng_channel_disable(struct lttng_channel
*channel
)
380 mutex_lock(&sessions_mutex
);
381 if (channel
->channel_type
== METADATA_CHANNEL
) {
385 if (!channel
->enabled
) {
389 /* Set atomically the state to "disabled" */
390 WRITE_ONCE(channel
->enabled
, 0);
391 /* Set transient enabler state to "enabled" */
393 lttng_session_sync_enablers(channel
->session
);
395 mutex_unlock(&sessions_mutex
);
399 int lttng_event_enable(struct lttng_event
*event
)
403 mutex_lock(&sessions_mutex
);
404 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
408 if (event
->enabled
) {
412 switch (event
->instrumentation
) {
413 case LTTNG_KERNEL_TRACEPOINT
:
414 case LTTNG_KERNEL_SYSCALL
:
417 case LTTNG_KERNEL_KPROBE
:
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);
424 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
430 mutex_unlock(&sessions_mutex
);
434 int lttng_event_disable(struct lttng_event
*event
)
438 mutex_lock(&sessions_mutex
);
439 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
443 if (!event
->enabled
) {
447 switch (event
->instrumentation
) {
448 case LTTNG_KERNEL_TRACEPOINT
:
449 case LTTNG_KERNEL_SYSCALL
:
452 case LTTNG_KERNEL_KPROBE
:
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);
459 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
465 mutex_unlock(&sessions_mutex
);
469 static struct lttng_transport
*lttng_transport_find(const char *name
)
471 struct lttng_transport
*transport
;
473 list_for_each_entry(transport
, <tng_transport_list
, node
) {
474 if (!strcmp(transport
->name
, name
))
480 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
481 const char *transport_name
,
483 size_t subbuf_size
, size_t num_subbuf
,
484 unsigned int switch_timer_interval
,
485 unsigned int read_timer_interval
,
486 enum channel_type channel_type
)
488 struct lttng_channel
*chan
;
489 struct lttng_transport
*transport
= NULL
;
491 mutex_lock(&sessions_mutex
);
492 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
493 goto active
; /* Refuse to add channel to active session */
494 transport
= lttng_transport_find(transport_name
);
496 printk(KERN_WARNING
"LTTng transport %s not found\n",
500 if (!try_module_get(transport
->owner
)) {
501 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
504 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
507 chan
->session
= session
;
508 chan
->id
= session
->free_chan_id
++;
509 chan
->ops
= &transport
->ops
;
511 * Note: the channel creation op already writes into the packet
512 * headers. Therefore the "chan" information used as input
513 * should be already accessible.
515 chan
->chan
= transport
->ops
.channel_create(transport_name
,
516 chan
, buf_addr
, subbuf_size
, num_subbuf
,
517 switch_timer_interval
, read_timer_interval
);
522 chan
->transport
= transport
;
523 chan
->channel_type
= channel_type
;
524 list_add(&chan
->list
, &session
->chan
);
525 mutex_unlock(&sessions_mutex
);
532 module_put(transport
->owner
);
535 mutex_unlock(&sessions_mutex
);
540 * Only used internally at session destruction for per-cpu channels, and
541 * when metadata channel is released.
542 * Needs to be called with sessions mutex held.
545 void _lttng_channel_destroy(struct lttng_channel
*chan
)
547 chan
->ops
->channel_destroy(chan
->chan
);
548 module_put(chan
->transport
->owner
);
549 list_del(&chan
->list
);
550 lttng_destroy_context(chan
->ctx
);
554 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
556 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
558 /* Protect the metadata cache with the sessions_mutex. */
559 mutex_lock(&sessions_mutex
);
560 _lttng_channel_destroy(chan
);
561 mutex_unlock(&sessions_mutex
);
563 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
566 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
568 stream
->finalized
= 1;
569 wake_up_interruptible(&stream
->read_wait
);
573 * Supports event creation while tracing session is active.
574 * Needs to be called with sessions mutex held.
576 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
577 struct lttng_kernel_event
*event_param
,
579 const struct lttng_event_desc
*event_desc
,
580 enum lttng_kernel_instrumentation itype
)
582 struct lttng_session
*session
= chan
->session
;
583 struct lttng_event
*event
;
584 const char *event_name
;
585 struct hlist_head
*head
;
590 if (chan
->free_event_id
== -1U) {
596 case LTTNG_KERNEL_TRACEPOINT
:
597 event_name
= event_desc
->name
;
599 case LTTNG_KERNEL_KPROBE
:
600 case LTTNG_KERNEL_KRETPROBE
:
601 case LTTNG_KERNEL_NOOP
:
602 case LTTNG_KERNEL_SYSCALL
:
603 event_name
= event_param
->name
;
605 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
611 name_len
= strlen(event_name
);
612 hash
= jhash(event_name
, name_len
, 0);
613 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
614 lttng_hlist_for_each_entry(event
, head
, hlist
) {
615 WARN_ON_ONCE(!event
->desc
);
616 if (!strncmp(event
->desc
->name
, event_name
,
617 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
618 && chan
== event
->chan
) {
624 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
630 event
->filter
= filter
;
631 event
->id
= chan
->free_event_id
++;
632 event
->instrumentation
= itype
;
633 event
->evtype
= LTTNG_TYPE_EVENT
;
634 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
635 INIT_LIST_HEAD(&event
->enablers_ref_head
);
638 case LTTNG_KERNEL_TRACEPOINT
:
639 /* Event will be enabled by enabler sync. */
641 event
->registered
= 0;
642 event
->desc
= lttng_event_get(event_name
);
647 /* Populate lttng_event structure before event registration. */
650 case LTTNG_KERNEL_KPROBE
:
652 * Needs to be explicitly enabled after creation, since
653 * we may want to apply filters.
656 event
->registered
= 1;
658 * Populate lttng_event structure before event
662 ret
= lttng_kprobes_register(event_name
,
663 event_param
->u
.kprobe
.symbol_name
,
664 event_param
->u
.kprobe
.offset
,
665 event_param
->u
.kprobe
.addr
,
671 ret
= try_module_get(event
->desc
->owner
);
674 case LTTNG_KERNEL_KRETPROBE
:
676 struct lttng_event
*event_return
;
678 /* kretprobe defines 2 events */
680 * Needs to be explicitly enabled after creation, since
681 * we may want to apply filters.
684 event
->registered
= 1;
686 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
691 event_return
->chan
= chan
;
692 event_return
->filter
= filter
;
693 event_return
->id
= chan
->free_event_id
++;
694 event_return
->enabled
= 0;
695 event_return
->registered
= 1;
696 event_return
->instrumentation
= itype
;
698 * Populate lttng_event structure before kretprobe registration.
701 ret
= lttng_kretprobes_register(event_name
,
702 event_param
->u
.kretprobe
.symbol_name
,
703 event_param
->u
.kretprobe
.offset
,
704 event_param
->u
.kretprobe
.addr
,
705 event
, event_return
);
707 kmem_cache_free(event_cache
, event_return
);
711 /* Take 2 refs on the module: one per event. */
712 ret
= try_module_get(event
->desc
->owner
);
714 ret
= try_module_get(event
->desc
->owner
);
716 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
718 WARN_ON_ONCE(ret
> 0);
720 kmem_cache_free(event_cache
, event_return
);
721 module_put(event
->desc
->owner
);
722 module_put(event
->desc
->owner
);
723 goto statedump_error
;
725 list_add(&event_return
->list
, &chan
->session
->events
);
728 case LTTNG_KERNEL_NOOP
:
729 case LTTNG_KERNEL_SYSCALL
:
731 * Needs to be explicitly enabled after creation, since
732 * we may want to apply filters.
735 event
->registered
= 0;
736 event
->desc
= event_desc
;
742 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
748 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
749 WARN_ON_ONCE(ret
> 0);
751 goto statedump_error
;
753 hlist_add_head(&event
->hlist
, head
);
754 list_add(&event
->list
, &chan
->session
->events
);
758 /* If a statedump error occurs, events will not be readable. */
760 kmem_cache_free(event_cache
, event
);
768 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
769 struct lttng_kernel_event
*event_param
,
771 const struct lttng_event_desc
*event_desc
,
772 enum lttng_kernel_instrumentation itype
)
774 struct lttng_event
*event
;
776 mutex_lock(&sessions_mutex
);
777 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
779 mutex_unlock(&sessions_mutex
);
783 /* Only used for tracepoints for now. */
785 void register_event(struct lttng_event
*event
)
787 const struct lttng_event_desc
*desc
;
790 if (event
->registered
)
794 switch (event
->instrumentation
) {
795 case LTTNG_KERNEL_TRACEPOINT
:
796 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
797 desc
->probe_callback
,
800 case LTTNG_KERNEL_SYSCALL
:
801 ret
= lttng_syscall_filter_enable(event
->chan
,
804 case LTTNG_KERNEL_KPROBE
:
805 case LTTNG_KERNEL_KRETPROBE
:
806 case LTTNG_KERNEL_NOOP
:
809 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
814 event
->registered
= 1;
818 * Only used internally at session destruction.
820 int _lttng_event_unregister(struct lttng_event
*event
)
822 const struct lttng_event_desc
*desc
;
825 if (!event
->registered
)
829 switch (event
->instrumentation
) {
830 case LTTNG_KERNEL_TRACEPOINT
:
831 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
832 event
->desc
->probe_callback
,
835 case LTTNG_KERNEL_KPROBE
:
836 lttng_kprobes_unregister(event
);
839 case LTTNG_KERNEL_KRETPROBE
:
840 lttng_kretprobes_unregister(event
);
843 case LTTNG_KERNEL_SYSCALL
:
844 ret
= lttng_syscall_filter_disable(event
->chan
,
847 case LTTNG_KERNEL_NOOP
:
850 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
855 event
->registered
= 0;
860 * Only used internally at session destruction.
863 void _lttng_event_destroy(struct lttng_event
*event
)
865 switch (event
->instrumentation
) {
866 case LTTNG_KERNEL_TRACEPOINT
:
867 lttng_event_put(event
->desc
);
869 case LTTNG_KERNEL_KPROBE
:
870 module_put(event
->desc
->owner
);
871 lttng_kprobes_destroy_private(event
);
873 case LTTNG_KERNEL_KRETPROBE
:
874 module_put(event
->desc
->owner
);
875 lttng_kretprobes_destroy_private(event
);
877 case LTTNG_KERNEL_NOOP
:
878 case LTTNG_KERNEL_SYSCALL
:
880 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
884 list_del(&event
->list
);
885 lttng_destroy_context(event
->ctx
);
886 kmem_cache_free(event_cache
, event
);
889 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
895 mutex_lock(&sessions_mutex
);
897 /* track all pids: destroy tracker. */
898 if (session
->pid_tracker
) {
899 struct lttng_pid_tracker
*lpf
;
901 lpf
= session
->pid_tracker
;
902 rcu_assign_pointer(session
->pid_tracker
, NULL
);
904 lttng_pid_tracker_destroy(lpf
);
908 if (!session
->pid_tracker
) {
909 struct lttng_pid_tracker
*lpf
;
911 lpf
= lttng_pid_tracker_create();
916 ret
= lttng_pid_tracker_add(lpf
, pid
);
917 rcu_assign_pointer(session
->pid_tracker
, lpf
);
919 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
923 mutex_unlock(&sessions_mutex
);
927 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
933 mutex_lock(&sessions_mutex
);
935 /* untrack all pids: replace by empty tracker. */
936 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
937 struct lttng_pid_tracker
*lpf
;
939 lpf
= lttng_pid_tracker_create();
944 rcu_assign_pointer(session
->pid_tracker
, lpf
);
947 lttng_pid_tracker_destroy(old_lpf
);
950 if (!session
->pid_tracker
) {
954 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
957 mutex_unlock(&sessions_mutex
);
962 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
964 struct lttng_session
*session
= m
->private;
965 struct lttng_pid_tracker
*lpf
;
966 struct lttng_pid_hash_node
*e
;
969 mutex_lock(&sessions_mutex
);
970 lpf
= session
->pid_tracker
;
972 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
973 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
975 lttng_hlist_for_each_entry(e
, head
, hlist
) {
981 /* PID tracker disabled. */
982 if (iter
>= *pos
&& iter
== 0) {
983 return session
; /* empty tracker */
991 /* Called with sessions_mutex held. */
993 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
995 struct lttng_session
*session
= m
->private;
996 struct lttng_pid_tracker
*lpf
;
997 struct lttng_pid_hash_node
*e
;
1001 lpf
= session
->pid_tracker
;
1003 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1004 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1006 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1007 if (iter
++ >= *ppos
)
1012 /* PID tracker disabled. */
1013 if (iter
>= *ppos
&& iter
== 0)
1014 return session
; /* empty tracker */
1023 void pid_list_stop(struct seq_file
*m
, void *p
)
1025 mutex_unlock(&sessions_mutex
);
1029 int pid_list_show(struct seq_file
*m
, void *p
)
1033 if (p
== m
->private) {
1034 /* Tracker disabled. */
1037 const struct lttng_pid_hash_node
*e
= p
;
1039 pid
= lttng_pid_tracker_get_node_pid(e
);
1041 seq_printf(m
, "process { pid = %d; };\n", pid
);
1046 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1047 .start
= pid_list_start
,
1048 .next
= pid_list_next
,
1049 .stop
= pid_list_stop
,
1050 .show
= pid_list_show
,
1054 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1056 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1060 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1062 struct seq_file
*m
= file
->private_data
;
1063 struct lttng_session
*session
= m
->private;
1066 WARN_ON_ONCE(!session
);
1067 ret
= seq_release(inode
, file
);
1068 if (!ret
&& session
)
1069 fput(session
->file
);
1073 const struct file_operations lttng_tracker_pids_list_fops
= {
1074 .owner
= THIS_MODULE
,
1075 .open
= lttng_tracker_pids_list_open
,
1077 .llseek
= seq_lseek
,
1078 .release
= lttng_tracker_pids_list_release
,
1081 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1083 struct file
*tracker_pids_list_file
;
1087 file_fd
= lttng_get_unused_fd();
1093 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1094 <tng_tracker_pids_list_fops
,
1096 if (IS_ERR(tracker_pids_list_file
)) {
1097 ret
= PTR_ERR(tracker_pids_list_file
);
1100 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1102 goto refcount_error
;
1104 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1107 m
= tracker_pids_list_file
->private_data
;
1108 m
->private = session
;
1109 fd_install(file_fd
, tracker_pids_list_file
);
1114 atomic_long_dec(&session
->file
->f_count
);
1116 fput(tracker_pids_list_file
);
1118 put_unused_fd(file_fd
);
1124 * Enabler management.
1127 int lttng_match_enabler_star_glob(const char *desc_name
,
1128 const char *pattern
)
1130 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1131 desc_name
, LTTNG_SIZE_MAX
))
1137 int lttng_match_enabler_name(const char *desc_name
,
1140 if (strcmp(desc_name
, name
))
1146 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1147 struct lttng_enabler
*enabler
)
1149 const char *desc_name
, *enabler_name
;
1151 enabler_name
= enabler
->event_param
.name
;
1152 switch (enabler
->event_param
.instrumentation
) {
1153 case LTTNG_KERNEL_TRACEPOINT
:
1154 desc_name
= desc
->name
;
1156 case LTTNG_KERNEL_SYSCALL
:
1157 desc_name
= desc
->name
;
1158 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1159 desc_name
+= strlen("compat_");
1160 if (!strncmp(desc_name
, "syscall_exit_",
1161 strlen("syscall_exit_"))) {
1162 desc_name
+= strlen("syscall_exit_");
1163 } else if (!strncmp(desc_name
, "syscall_entry_",
1164 strlen("syscall_entry_"))) {
1165 desc_name
+= strlen("syscall_entry_");
1175 switch (enabler
->type
) {
1176 case LTTNG_ENABLER_STAR_GLOB
:
1177 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1178 case LTTNG_ENABLER_NAME
:
1179 return lttng_match_enabler_name(desc_name
, enabler_name
);
1186 int lttng_event_match_enabler(struct lttng_event
*event
,
1187 struct lttng_enabler
*enabler
)
1189 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1191 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1192 && event
->chan
== enabler
->chan
)
1199 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1200 struct lttng_enabler
*enabler
)
1202 struct lttng_enabler_ref
*enabler_ref
;
1204 list_for_each_entry(enabler_ref
,
1205 &event
->enablers_ref_head
, node
) {
1206 if (enabler_ref
->ref
== enabler
)
1213 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1215 struct lttng_session
*session
= enabler
->chan
->session
;
1216 struct lttng_probe_desc
*probe_desc
;
1217 const struct lttng_event_desc
*desc
;
1219 struct list_head
*probe_list
;
1221 probe_list
= lttng_get_probe_list_head();
1223 * For each probe event, if we find that a probe event matches
1224 * our enabler, create an associated lttng_event if not
1227 list_for_each_entry(probe_desc
, probe_list
, head
) {
1228 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1230 struct hlist_head
*head
;
1231 const char *event_name
;
1234 struct lttng_event
*event
;
1236 desc
= probe_desc
->event_desc
[i
];
1237 if (!lttng_desc_match_enabler(desc
, enabler
))
1239 event_name
= desc
->name
;
1240 name_len
= strlen(event_name
);
1243 * Check if already created.
1245 hash
= jhash(event_name
, name_len
, 0);
1246 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1247 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1248 if (event
->desc
== desc
1249 && event
->chan
== enabler
->chan
)
1256 * We need to create an event for this
1259 event
= _lttng_event_create(enabler
->chan
,
1261 LTTNG_KERNEL_TRACEPOINT
);
1263 printk(KERN_INFO
"Unable to create event %s\n",
1264 probe_desc
->event_desc
[i
]->name
);
1271 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1275 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1280 * Create struct lttng_event if it is missing and present in the list of
1281 * tracepoint probes.
1282 * Should be called with sessions mutex held.
1285 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1287 switch (enabler
->event_param
.instrumentation
) {
1288 case LTTNG_KERNEL_TRACEPOINT
:
1289 lttng_create_tracepoint_if_missing(enabler
);
1291 case LTTNG_KERNEL_SYSCALL
:
1292 lttng_create_syscall_if_missing(enabler
);
1301 * Create events associated with an enabler (if not already present),
1302 * and add backward reference from the event to the enabler.
1303 * Should be called with sessions mutex held.
1306 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1308 struct lttng_session
*session
= enabler
->chan
->session
;
1309 struct lttng_event
*event
;
1311 /* First ensure that probe events are created for this enabler. */
1312 lttng_create_event_if_missing(enabler
);
1314 /* For each event matching enabler in session event list. */
1315 list_for_each_entry(event
, &session
->events
, list
) {
1316 struct lttng_enabler_ref
*enabler_ref
;
1318 if (!lttng_event_match_enabler(event
, enabler
))
1320 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1323 * If no backward ref, create it.
1324 * Add backward ref from event to enabler.
1326 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1329 enabler_ref
->ref
= enabler
;
1330 list_add(&enabler_ref
->node
,
1331 &event
->enablers_ref_head
);
1335 * Link filter bytecodes if not linked yet.
1337 lttng_enabler_event_link_bytecode(event
, enabler
);
1339 /* TODO: merge event context. */
1345 * Called at module load: connect the probe on all enablers matching
1347 * Called with sessions lock held.
1349 int lttng_fix_pending_events(void)
1351 struct lttng_session
*session
;
1353 list_for_each_entry(session
, &sessions
, list
)
1354 lttng_session_lazy_sync_enablers(session
);
1358 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1359 struct lttng_kernel_event
*event_param
,
1360 struct lttng_channel
*chan
)
1362 struct lttng_enabler
*enabler
;
1364 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1367 enabler
->type
= type
;
1368 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1369 memcpy(&enabler
->event_param
, event_param
,
1370 sizeof(enabler
->event_param
));
1371 enabler
->chan
= chan
;
1373 enabler
->enabled
= 0;
1374 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1375 mutex_lock(&sessions_mutex
);
1376 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1377 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1378 mutex_unlock(&sessions_mutex
);
1382 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1384 mutex_lock(&sessions_mutex
);
1385 enabler
->enabled
= 1;
1386 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1387 mutex_unlock(&sessions_mutex
);
1391 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1393 mutex_lock(&sessions_mutex
);
1394 enabler
->enabled
= 0;
1395 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1396 mutex_unlock(&sessions_mutex
);
1400 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1401 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1403 struct lttng_filter_bytecode_node
*bytecode_node
;
1404 uint32_t bytecode_len
;
1407 ret
= get_user(bytecode_len
, &bytecode
->len
);
1410 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1414 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1415 sizeof(*bytecode
) + bytecode_len
);
1418 bytecode_node
->enabler
= enabler
;
1419 /* Enforce length based on allocated size */
1420 bytecode_node
->bc
.len
= bytecode_len
;
1421 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1422 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1426 kfree(bytecode_node
);
1430 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1431 struct lttng_kernel_context
*context_param
)
1437 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1439 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1441 /* Destroy filter bytecode */
1442 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1443 &enabler
->filter_bytecode_head
, node
) {
1447 /* Destroy contexts */
1448 lttng_destroy_context(enabler
->ctx
);
1450 list_del(&enabler
->node
);
1455 * lttng_session_sync_enablers should be called just before starting a
1457 * Should be called with sessions mutex held.
1460 void lttng_session_sync_enablers(struct lttng_session
*session
)
1462 struct lttng_enabler
*enabler
;
1463 struct lttng_event
*event
;
1465 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1466 lttng_enabler_ref_events(enabler
);
1468 * For each event, if at least one of its enablers is enabled,
1469 * and its channel and session transient states are enabled, we
1470 * enable the event, else we disable it.
1472 list_for_each_entry(event
, &session
->events
, list
) {
1473 struct lttng_enabler_ref
*enabler_ref
;
1474 struct lttng_bytecode_runtime
*runtime
;
1475 int enabled
= 0, has_enablers_without_bytecode
= 0;
1477 switch (event
->instrumentation
) {
1478 case LTTNG_KERNEL_TRACEPOINT
:
1479 case LTTNG_KERNEL_SYSCALL
:
1481 list_for_each_entry(enabler_ref
,
1482 &event
->enablers_ref_head
, node
) {
1483 if (enabler_ref
->ref
->enabled
) {
1490 /* Not handled with lazy sync. */
1494 * Enabled state is based on union of enablers, with
1495 * intesection of session and channel transient enable
1498 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1500 WRITE_ONCE(event
->enabled
, enabled
);
1502 * Sync tracepoint registration with event enabled
1506 register_event(event
);
1508 _lttng_event_unregister(event
);
1511 /* Check if has enablers without bytecode enabled */
1512 list_for_each_entry(enabler_ref
,
1513 &event
->enablers_ref_head
, node
) {
1514 if (enabler_ref
->ref
->enabled
1515 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1516 has_enablers_without_bytecode
= 1;
1520 event
->has_enablers_without_bytecode
=
1521 has_enablers_without_bytecode
;
1523 /* Enable filters */
1524 list_for_each_entry(runtime
,
1525 &event
->bytecode_runtime_head
, node
)
1526 lttng_filter_sync_state(runtime
);
1531 * Apply enablers to session events, adding events to session if need
1532 * be. It is required after each modification applied to an active
1533 * session, and right before session "start".
1534 * "lazy" sync means we only sync if required.
1535 * Should be called with sessions mutex held.
1538 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1540 /* We can skip if session is not active */
1541 if (!session
->active
)
1543 lttng_session_sync_enablers(session
);
1547 * Serialize at most one packet worth of metadata into a metadata
1549 * We grab the metadata cache mutex to get exclusive access to our metadata
1550 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1551 * allows us to do racy operations such as looking for remaining space left in
1552 * packet and write, since mutual exclusion protects us from concurrent writes.
1553 * Mutual exclusion on the metadata cache allow us to read the cache content
1554 * without racing against reallocation of the cache by updates.
1555 * Returns the number of bytes written in the channel, 0 if no data
1556 * was written and a negative value on error.
1558 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1559 struct channel
*chan
)
1561 struct lib_ring_buffer_ctx ctx
;
1563 size_t len
, reserve_len
;
1566 * Ensure we support mutiple get_next / put sequences followed by
1567 * put_next. The metadata cache lock protects reading the metadata
1568 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1569 * "flush" operations on the buffer invoked by different processes.
1570 * Moreover, since the metadata cache memory can be reallocated, we
1571 * need to have exclusive access against updates even though we only
1574 mutex_lock(&stream
->metadata_cache
->lock
);
1575 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1576 if (stream
->metadata_in
!= stream
->metadata_out
)
1579 /* Metadata regenerated, change the version. */
1580 if (stream
->metadata_cache
->version
!= stream
->version
)
1581 stream
->version
= stream
->metadata_cache
->version
;
1583 len
= stream
->metadata_cache
->metadata_written
-
1584 stream
->metadata_in
;
1587 reserve_len
= min_t(size_t,
1588 stream
->transport
->ops
.packet_avail_size(chan
),
1590 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1593 * If reservation failed, return an error to the caller.
1595 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1597 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1600 stream
->transport
->ops
.event_write(&ctx
,
1601 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1603 stream
->transport
->ops
.event_commit(&ctx
);
1604 stream
->metadata_in
+= reserve_len
;
1608 mutex_unlock(&stream
->metadata_cache
->lock
);
1613 * Write the metadata to the metadata cache.
1614 * Must be called with sessions_mutex held.
1615 * The metadata cache lock protects us from concurrent read access from
1616 * thread outputting metadata content to ring buffer.
1618 int lttng_metadata_printf(struct lttng_session
*session
,
1619 const char *fmt
, ...)
1624 struct lttng_metadata_stream
*stream
;
1626 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1629 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1635 mutex_lock(&session
->metadata_cache
->lock
);
1636 if (session
->metadata_cache
->metadata_written
+ len
>
1637 session
->metadata_cache
->cache_alloc
) {
1638 char *tmp_cache_realloc
;
1639 unsigned int tmp_cache_alloc_size
;
1641 tmp_cache_alloc_size
= max_t(unsigned int,
1642 session
->metadata_cache
->cache_alloc
+ len
,
1643 session
->metadata_cache
->cache_alloc
<< 1);
1644 tmp_cache_realloc
= lttng_vzalloc(tmp_cache_alloc_size
);
1645 if (!tmp_cache_realloc
)
1647 if (session
->metadata_cache
->data
) {
1648 memcpy(tmp_cache_realloc
,
1649 session
->metadata_cache
->data
,
1650 session
->metadata_cache
->cache_alloc
);
1651 vfree(session
->metadata_cache
->data
);
1654 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1655 session
->metadata_cache
->data
= tmp_cache_realloc
;
1657 memcpy(session
->metadata_cache
->data
+
1658 session
->metadata_cache
->metadata_written
,
1660 session
->metadata_cache
->metadata_written
+= len
;
1661 mutex_unlock(&session
->metadata_cache
->lock
);
1664 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1665 wake_up_interruptible(&stream
->read_wait
);
1670 mutex_unlock(&session
->metadata_cache
->lock
);
1676 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1680 for (i
= 0; i
< nesting
; i
++) {
1683 ret
= lttng_metadata_printf(session
, " ");
1692 * Must be called with sessions_mutex held.
1695 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1696 const struct lttng_type
*type
,
1700 uint32_t i
, nr_fields
;
1702 ret
= print_tabs(session
, nesting
);
1705 ret
= lttng_metadata_printf(session
,
1709 nr_fields
= type
->u
._struct
.nr_fields
;
1710 for (i
= 0; i
< nr_fields
; i
++) {
1711 const struct lttng_event_field
*iter_field
;
1713 iter_field
= &type
->u
._struct
.fields
[i
];
1714 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1718 ret
= print_tabs(session
, nesting
);
1721 ret
= lttng_metadata_printf(session
,
1727 * Must be called with sessions_mutex held.
1730 int _lttng_struct_statedump(struct lttng_session
*session
,
1731 const struct lttng_event_field
*field
,
1736 ret
= _lttng_struct_type_statedump(session
,
1737 &field
->type
, nesting
);
1740 ret
= lttng_metadata_printf(session
,
1747 * Must be called with sessions_mutex held.
1750 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1751 const struct lttng_type
*type
,
1755 uint32_t i
, nr_choices
;
1757 ret
= print_tabs(session
, nesting
);
1760 ret
= lttng_metadata_printf(session
,
1761 "variant <_%s> {\n",
1762 type
->u
.variant
.tag_name
);
1765 nr_choices
= type
->u
.variant
.nr_choices
;
1766 for (i
= 0; i
< nr_choices
; i
++) {
1767 const struct lttng_event_field
*iter_field
;
1769 iter_field
= &type
->u
.variant
.choices
[i
];
1770 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1774 ret
= print_tabs(session
, nesting
);
1777 ret
= lttng_metadata_printf(session
,
1783 * Must be called with sessions_mutex held.
1786 int _lttng_variant_statedump(struct lttng_session
*session
,
1787 const struct lttng_event_field
*field
,
1792 ret
= _lttng_variant_type_statedump(session
,
1793 &field
->type
, nesting
);
1796 ret
= lttng_metadata_printf(session
,
1803 * Must be called with sessions_mutex held.
1806 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1807 const struct lttng_event_field
*field
,
1811 const struct lttng_type
*elem_type
;
1813 /* Only array of structures and variants are currently supported. */
1814 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1815 switch (elem_type
->atype
) {
1817 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1822 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1829 ret
= lttng_metadata_printf(session
,
1832 field
->type
.u
.array_compound
.length
);
1837 * Must be called with sessions_mutex held.
1840 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1841 const struct lttng_event_field
*field
,
1845 const char *length_name
;
1846 const struct lttng_type
*elem_type
;
1848 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1850 /* Only array of structures and variants are currently supported. */
1851 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1852 switch (elem_type
->atype
) {
1854 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1859 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1866 ret
= lttng_metadata_printf(session
,
1874 * Must be called with sessions_mutex held.
1877 int _lttng_enum_statedump(struct lttng_session
*session
,
1878 const struct lttng_event_field
*field
,
1881 const struct lttng_enum_desc
*enum_desc
;
1882 const struct lttng_integer_type
*container_type
;
1884 unsigned int i
, nr_entries
;
1886 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1887 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1888 nr_entries
= enum_desc
->nr_entries
;
1890 ret
= print_tabs(session
, nesting
);
1893 ret
= lttng_metadata_printf(session
,
1894 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1895 container_type
->size
,
1896 container_type
->alignment
,
1897 container_type
->signedness
,
1898 (container_type
->encoding
== lttng_encode_none
)
1900 : (container_type
->encoding
== lttng_encode_UTF8
)
1903 container_type
->base
,
1904 #if __BYTE_ORDER == __BIG_ENDIAN
1905 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1907 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1912 /* Dump all entries */
1913 for (i
= 0; i
< nr_entries
; i
++) {
1914 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1917 ret
= print_tabs(session
, nesting
+ 1);
1920 ret
= lttng_metadata_printf(session
,
1924 len
= strlen(entry
->string
);
1925 /* Escape the character '"' */
1926 for (j
= 0; j
< len
; j
++) {
1927 char c
= entry
->string
[j
];
1931 ret
= lttng_metadata_printf(session
,
1935 ret
= lttng_metadata_printf(session
,
1939 ret
= lttng_metadata_printf(session
,
1946 ret
= lttng_metadata_printf(session
, "\"");
1950 if (entry
->options
.is_auto
) {
1951 ret
= lttng_metadata_printf(session
, ",\n");
1955 ret
= lttng_metadata_printf(session
,
1959 if (entry
->start
.signedness
)
1960 ret
= lttng_metadata_printf(session
,
1961 "%lld", (long long) entry
->start
.value
);
1963 ret
= lttng_metadata_printf(session
,
1964 "%llu", entry
->start
.value
);
1967 if (entry
->start
.signedness
== entry
->end
.signedness
&&
1969 == entry
->end
.value
) {
1970 ret
= lttng_metadata_printf(session
,
1973 if (entry
->end
.signedness
) {
1974 ret
= lttng_metadata_printf(session
,
1976 (long long) entry
->end
.value
);
1978 ret
= lttng_metadata_printf(session
,
1987 ret
= print_tabs(session
, nesting
);
1990 ret
= lttng_metadata_printf(session
, "} _%s;\n",
1997 * Must be called with sessions_mutex held.
2000 int _lttng_field_statedump(struct lttng_session
*session
,
2001 const struct lttng_event_field
*field
,
2006 switch (field
->type
.atype
) {
2008 ret
= print_tabs(session
, nesting
);
2011 ret
= lttng_metadata_printf(session
,
2012 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2013 field
->type
.u
.basic
.integer
.size
,
2014 field
->type
.u
.basic
.integer
.alignment
,
2015 field
->type
.u
.basic
.integer
.signedness
,
2016 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2018 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2021 field
->type
.u
.basic
.integer
.base
,
2022 #if __BYTE_ORDER == __BIG_ENDIAN
2023 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2025 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2030 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2034 const struct lttng_basic_type
*elem_type
;
2036 elem_type
= &field
->type
.u
.array
.elem_type
;
2037 if (field
->type
.u
.array
.elem_alignment
) {
2038 ret
= print_tabs(session
, nesting
);
2041 ret
= lttng_metadata_printf(session
,
2042 "struct { } align(%u) _%s_padding;\n",
2043 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2048 ret
= print_tabs(session
, nesting
);
2051 ret
= lttng_metadata_printf(session
,
2052 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2053 elem_type
->u
.basic
.integer
.size
,
2054 elem_type
->u
.basic
.integer
.alignment
,
2055 elem_type
->u
.basic
.integer
.signedness
,
2056 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2058 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2061 elem_type
->u
.basic
.integer
.base
,
2062 #if __BYTE_ORDER == __BIG_ENDIAN
2063 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2065 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2067 field
->name
, field
->type
.u
.array
.length
);
2070 case atype_sequence
:
2072 const struct lttng_basic_type
*elem_type
;
2073 const struct lttng_basic_type
*length_type
;
2075 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2076 length_type
= &field
->type
.u
.sequence
.length_type
;
2077 ret
= print_tabs(session
, nesting
);
2080 ret
= lttng_metadata_printf(session
,
2081 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2082 length_type
->u
.basic
.integer
.size
,
2083 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2084 length_type
->u
.basic
.integer
.signedness
,
2085 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2087 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2090 length_type
->u
.basic
.integer
.base
,
2091 #if __BYTE_ORDER == __BIG_ENDIAN
2092 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2094 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2100 if (field
->type
.u
.sequence
.elem_alignment
) {
2101 ret
= print_tabs(session
, nesting
);
2104 ret
= lttng_metadata_printf(session
,
2105 "struct { } align(%u) _%s_padding;\n",
2106 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2111 ret
= print_tabs(session
, nesting
);
2114 ret
= lttng_metadata_printf(session
,
2115 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2116 elem_type
->u
.basic
.integer
.size
,
2117 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2118 elem_type
->u
.basic
.integer
.signedness
,
2119 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2121 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2124 elem_type
->u
.basic
.integer
.base
,
2125 #if __BYTE_ORDER == __BIG_ENDIAN
2126 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2128 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2136 /* Default encoding is UTF8 */
2137 ret
= print_tabs(session
, nesting
);
2140 ret
= lttng_metadata_printf(session
,
2142 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2143 " { encoding = ASCII; }" : "",
2147 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2149 case atype_array_compound
:
2150 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2152 case atype_sequence_compound
:
2153 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2156 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2167 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2168 struct lttng_ctx
*ctx
)
2175 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2176 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2178 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2186 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2187 struct lttng_event
*event
)
2189 const struct lttng_event_desc
*desc
= event
->desc
;
2193 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2194 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2196 ret
= _lttng_field_statedump(session
, field
, 2);
2204 * Must be called with sessions_mutex held.
2207 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2208 struct lttng_channel
*chan
,
2209 struct lttng_event
*event
)
2213 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2215 if (chan
->channel_type
== METADATA_CHANNEL
)
2218 ret
= lttng_metadata_printf(session
,
2222 " stream_id = %u;\n",
2230 ret
= lttng_metadata_printf(session
,
2231 " context := struct {\n");
2235 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2239 ret
= lttng_metadata_printf(session
,
2245 ret
= lttng_metadata_printf(session
,
2246 " fields := struct {\n"
2251 ret
= _lttng_fields_metadata_statedump(session
, event
);
2256 * LTTng space reservation can only reserve multiples of the
2259 ret
= lttng_metadata_printf(session
,
2265 event
->metadata_dumped
= 1;
2272 * Must be called with sessions_mutex held.
2275 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2276 struct lttng_channel
*chan
)
2280 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2283 if (chan
->channel_type
== METADATA_CHANNEL
)
2286 WARN_ON_ONCE(!chan
->header_type
);
2287 ret
= lttng_metadata_printf(session
,
2290 " event.header := %s;\n"
2291 " packet.context := struct packet_context;\n",
2293 chan
->header_type
== 1 ? "struct event_header_compact" :
2294 "struct event_header_large");
2299 ret
= lttng_metadata_printf(session
,
2300 " event.context := struct {\n");
2304 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2308 ret
= lttng_metadata_printf(session
,
2314 ret
= lttng_metadata_printf(session
,
2317 chan
->metadata_dumped
= 1;
2323 * Must be called with sessions_mutex held.
2326 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2328 return lttng_metadata_printf(session
,
2329 "struct packet_context {\n"
2330 " uint64_clock_monotonic_t timestamp_begin;\n"
2331 " uint64_clock_monotonic_t timestamp_end;\n"
2332 " uint64_t content_size;\n"
2333 " uint64_t packet_size;\n"
2334 " uint64_t packet_seq_num;\n"
2335 " unsigned long events_discarded;\n"
2336 " uint32_t cpu_id;\n"
2343 * id: range: 0 - 30.
2344 * id 31 is reserved to indicate an extended header.
2347 * id: range: 0 - 65534.
2348 * id 65535 is reserved to indicate an extended header.
2350 * Must be called with sessions_mutex held.
2353 int _lttng_event_header_declare(struct lttng_session
*session
)
2355 return lttng_metadata_printf(session
,
2356 "struct event_header_compact {\n"
2357 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2360 " uint27_clock_monotonic_t timestamp;\n"
2364 " uint64_clock_monotonic_t timestamp;\n"
2369 "struct event_header_large {\n"
2370 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2373 " uint32_clock_monotonic_t timestamp;\n"
2377 " uint64_clock_monotonic_t timestamp;\n"
2381 lttng_alignof(uint32_t) * CHAR_BIT
,
2382 lttng_alignof(uint16_t) * CHAR_BIT
2387 * Approximation of NTP time of day to clock monotonic correlation,
2388 * taken at start of trace.
2389 * Yes, this is only an approximation. Yes, we can (and will) do better
2390 * in future versions.
2391 * This function may return a negative offset. It may happen if the
2392 * system sets the REALTIME clock to 0 after boot.
2394 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2398 int64_t measure_clock_offset(void)
2400 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2401 uint64_t tcf
= trace_clock_freq();
2403 unsigned long flags
;
2404 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
2405 struct timespec64 rts
= { 0, 0 };
2407 struct timespec rts
= { 0, 0 };
2410 /* Disable interrupts to increase correlation precision. */
2411 local_irq_save(flags
);
2412 monotonic
[0] = trace_clock_read64();
2413 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
2414 ktime_get_real_ts64(&rts
);
2416 getnstimeofday(&rts
);
2418 monotonic
[1] = trace_clock_read64();
2419 local_irq_restore(flags
);
2421 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2422 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2423 if (tcf
== NSEC_PER_SEC
) {
2424 realtime
+= rts
.tv_nsec
;
2426 uint64_t n
= rts
.tv_nsec
* tcf
;
2428 do_div(n
, NSEC_PER_SEC
);
2431 offset
= (int64_t) realtime
- monotonic_avg
;
2436 * Output metadata into this session's metadata buffers.
2437 * Must be called with sessions_mutex held.
2440 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2442 unsigned char *uuid_c
= session
->uuid
.b
;
2443 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2444 struct lttng_channel
*chan
;
2445 struct lttng_event
*event
;
2448 if (!READ_ONCE(session
->active
))
2450 if (session
->metadata_dumped
)
2453 snprintf(uuid_s
, sizeof(uuid_s
),
2454 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2455 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2456 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2457 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2458 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2460 ret
= lttng_metadata_printf(session
,
2461 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2462 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2463 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2464 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2465 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2466 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2467 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2473 " byte_order = %s;\n"
2474 " packet.header := struct {\n"
2475 " uint32_t magic;\n"
2476 " uint8_t uuid[16];\n"
2477 " uint32_t stream_id;\n"
2478 " uint64_t stream_instance_id;\n"
2481 lttng_alignof(uint8_t) * CHAR_BIT
,
2482 lttng_alignof(uint16_t) * CHAR_BIT
,
2483 lttng_alignof(uint32_t) * CHAR_BIT
,
2484 lttng_alignof(uint64_t) * CHAR_BIT
,
2485 sizeof(unsigned long) * CHAR_BIT
,
2486 lttng_alignof(unsigned long) * CHAR_BIT
,
2490 #if __BYTE_ORDER == __BIG_ENDIAN
2499 ret
= lttng_metadata_printf(session
,
2501 " hostname = \"%s\";\n"
2502 " domain = \"kernel\";\n"
2503 " sysname = \"%s\";\n"
2504 " kernel_release = \"%s\";\n"
2505 " kernel_version = \"%s\";\n"
2506 " tracer_name = \"lttng-modules\";\n"
2507 " tracer_major = %d;\n"
2508 " tracer_minor = %d;\n"
2509 " tracer_patchlevel = %d;\n"
2511 current
->nsproxy
->uts_ns
->name
.nodename
,
2515 LTTNG_MODULES_MAJOR_VERSION
,
2516 LTTNG_MODULES_MINOR_VERSION
,
2517 LTTNG_MODULES_PATCHLEVEL_VERSION
2522 ret
= lttng_metadata_printf(session
,
2524 " name = \"%s\";\n",
2530 if (!trace_clock_uuid(clock_uuid_s
)) {
2531 ret
= lttng_metadata_printf(session
,
2532 " uuid = \"%s\";\n",
2539 ret
= lttng_metadata_printf(session
,
2540 " description = \"%s\";\n"
2541 " freq = %llu; /* Frequency, in Hz */\n"
2542 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2545 trace_clock_description(),
2546 (unsigned long long) trace_clock_freq(),
2547 (long long) measure_clock_offset()
2552 ret
= lttng_metadata_printf(session
,
2553 "typealias integer {\n"
2554 " size = 27; align = 1; signed = false;\n"
2555 " map = clock.%s.value;\n"
2556 "} := uint27_clock_monotonic_t;\n"
2558 "typealias integer {\n"
2559 " size = 32; align = %u; signed = false;\n"
2560 " map = clock.%s.value;\n"
2561 "} := uint32_clock_monotonic_t;\n"
2563 "typealias integer {\n"
2564 " size = 64; align = %u; signed = false;\n"
2565 " map = clock.%s.value;\n"
2566 "} := uint64_clock_monotonic_t;\n\n",
2568 lttng_alignof(uint32_t) * CHAR_BIT
,
2570 lttng_alignof(uint64_t) * CHAR_BIT
,
2576 ret
= _lttng_stream_packet_context_declare(session
);
2580 ret
= _lttng_event_header_declare(session
);
2585 list_for_each_entry(chan
, &session
->chan
, list
) {
2586 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2591 list_for_each_entry(event
, &session
->events
, list
) {
2592 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2596 session
->metadata_dumped
= 1;
2602 * lttng_transport_register - LTT transport registration
2603 * @transport: transport structure
2605 * Registers a transport which can be used as output to extract the data out of
2606 * LTTng. The module calling this registration function must ensure that no
2607 * trap-inducing code will be executed by the transport functions. E.g.
2608 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2609 * is made visible to the transport function. This registration acts as a
2610 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2611 * after its registration must it synchronize the TLBs.
2613 void lttng_transport_register(struct lttng_transport
*transport
)
2616 * Make sure no page fault can be triggered by the module about to be
2617 * registered. We deal with this here so we don't have to call
2618 * vmalloc_sync_all() in each module's init.
2620 wrapper_vmalloc_sync_all();
2622 mutex_lock(&sessions_mutex
);
2623 list_add_tail(&transport
->node
, <tng_transport_list
);
2624 mutex_unlock(&sessions_mutex
);
2626 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2629 * lttng_transport_unregister - LTT transport unregistration
2630 * @transport: transport structure
2632 void lttng_transport_unregister(struct lttng_transport
*transport
)
2634 mutex_lock(&sessions_mutex
);
2635 list_del(&transport
->node
);
2636 mutex_unlock(&sessions_mutex
);
2638 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2640 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2642 enum cpuhp_state lttng_hp_prepare
;
2643 enum cpuhp_state lttng_hp_online
;
2645 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2647 struct lttng_cpuhp_node
*lttng_node
;
2649 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2650 switch (lttng_node
->component
) {
2651 case LTTNG_RING_BUFFER_FRONTEND
:
2653 case LTTNG_RING_BUFFER_BACKEND
:
2654 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2655 case LTTNG_RING_BUFFER_ITER
:
2657 case LTTNG_CONTEXT_PERF_COUNTERS
:
2664 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2666 struct lttng_cpuhp_node
*lttng_node
;
2668 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2669 switch (lttng_node
->component
) {
2670 case LTTNG_RING_BUFFER_FRONTEND
:
2671 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2672 case LTTNG_RING_BUFFER_BACKEND
:
2674 case LTTNG_RING_BUFFER_ITER
:
2676 case LTTNG_CONTEXT_PERF_COUNTERS
:
2677 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2683 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2685 struct lttng_cpuhp_node
*lttng_node
;
2687 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2688 switch (lttng_node
->component
) {
2689 case LTTNG_RING_BUFFER_FRONTEND
:
2690 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2691 case LTTNG_RING_BUFFER_BACKEND
:
2693 case LTTNG_RING_BUFFER_ITER
:
2694 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2695 case LTTNG_CONTEXT_PERF_COUNTERS
:
2696 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2702 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2704 struct lttng_cpuhp_node
*lttng_node
;
2706 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2707 switch (lttng_node
->component
) {
2708 case LTTNG_RING_BUFFER_FRONTEND
:
2709 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2710 case LTTNG_RING_BUFFER_BACKEND
:
2712 case LTTNG_RING_BUFFER_ITER
:
2714 case LTTNG_CONTEXT_PERF_COUNTERS
:
2721 static int __init
lttng_init_cpu_hotplug(void)
2725 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2726 lttng_hotplug_prepare
,
2727 lttng_hotplug_dead
);
2731 lttng_hp_prepare
= ret
;
2732 lttng_rb_set_hp_prepare(ret
);
2734 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2735 lttng_hotplug_online
,
2736 lttng_hotplug_offline
);
2738 cpuhp_remove_multi_state(lttng_hp_prepare
);
2739 lttng_hp_prepare
= 0;
2742 lttng_hp_online
= ret
;
2743 lttng_rb_set_hp_online(ret
);
2748 static void __exit
lttng_exit_cpu_hotplug(void)
2750 lttng_rb_set_hp_online(0);
2751 cpuhp_remove_multi_state(lttng_hp_online
);
2752 lttng_rb_set_hp_prepare(0);
2753 cpuhp_remove_multi_state(lttng_hp_prepare
);
2756 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2757 static int lttng_init_cpu_hotplug(void)
2761 static void lttng_exit_cpu_hotplug(void)
2764 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2767 static int __init
lttng_events_init(void)
2771 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2774 ret
= wrapper_get_pfnblock_flags_mask_init();
2777 ret
= wrapper_get_pageblock_flags_mask_init();
2780 ret
= lttng_probes_init();
2783 ret
= lttng_context_init();
2786 ret
= lttng_tracepoint_init();
2789 event_cache
= KMEM_CACHE(lttng_event
, 0);
2794 ret
= lttng_abi_init();
2797 ret
= lttng_logger_init();
2800 ret
= lttng_init_cpu_hotplug();
2803 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2804 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2805 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2806 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2807 LTTNG_MODULES_EXTRAVERSION
,
2809 #ifdef LTTNG_EXTRA_VERSION_GIT
2810 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2814 #ifdef LTTNG_EXTRA_VERSION_NAME
2815 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2822 lttng_logger_exit();
2826 kmem_cache_destroy(event_cache
);
2828 lttng_tracepoint_exit();
2830 lttng_context_exit();
2831 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2832 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2833 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2834 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2835 LTTNG_MODULES_EXTRAVERSION
,
2837 #ifdef LTTNG_EXTRA_VERSION_GIT
2838 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2842 #ifdef LTTNG_EXTRA_VERSION_NAME
2843 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2850 module_init(lttng_events_init
);
2852 static void __exit
lttng_events_exit(void)
2854 struct lttng_session
*session
, *tmpsession
;
2856 lttng_exit_cpu_hotplug();
2857 lttng_logger_exit();
2859 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2860 lttng_session_destroy(session
);
2861 kmem_cache_destroy(event_cache
);
2862 lttng_tracepoint_exit();
2863 lttng_context_exit();
2864 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2865 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2866 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2867 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2868 LTTNG_MODULES_EXTRAVERSION
,
2870 #ifdef LTTNG_EXTRA_VERSION_GIT
2871 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2875 #ifdef LTTNG_EXTRA_VERSION_NAME
2876 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2882 module_exit(lttng_events_exit
);
2884 #include "extra_version/patches.i"
2885 #ifdef LTTNG_EXTRA_VERSION_GIT
2886 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
2888 #ifdef LTTNG_EXTRA_VERSION_NAME
2889 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
2891 MODULE_LICENSE("GPL and additional rights");
2892 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2893 MODULE_DESCRIPTION("LTTng Events");
2894 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
2895 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
2896 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
2897 LTTNG_MODULES_EXTRAVERSION
);