1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/jhash.h>
28 #include <linux/uaccess.h>
29 #include <linux/vmalloc.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng-kernel-version.h>
38 #include <lttng-events.h>
39 #include <lttng-tracer.h>
40 #include <lttng-abi-old.h>
41 #include <lttng-endian.h>
42 #include <lttng-string-utils.h>
43 #include <wrapper/vzalloc.h>
44 #include <wrapper/ringbuffer/backend.h>
45 #include <wrapper/ringbuffer/frontend.h>
47 #define METADATA_CACHE_DEFAULT_SIZE 4096
49 static LIST_HEAD(sessions
);
50 static LIST_HEAD(lttng_transport_list
);
52 * Protect the sessions and metadata caches.
54 static DEFINE_MUTEX(sessions_mutex
);
55 static struct kmem_cache
*event_cache
;
57 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
58 static void lttng_session_sync_enablers(struct lttng_session
*session
);
59 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
61 static void _lttng_event_destroy(struct lttng_event
*event
);
62 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
63 static int _lttng_event_unregister(struct lttng_event
*event
);
65 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
66 struct lttng_channel
*chan
,
67 struct lttng_event
*event
);
69 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
71 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
73 int _lttng_field_statedump(struct lttng_session
*session
,
74 const struct lttng_event_field
*field
,
77 void synchronize_trace(void)
79 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
85 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
86 #ifdef CONFIG_PREEMPT_RT_FULL
89 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
90 #ifdef CONFIG_PREEMPT_RT
93 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
96 void lttng_lock_sessions(void)
98 mutex_lock(&sessions_mutex
);
101 void lttng_unlock_sessions(void)
103 mutex_unlock(&sessions_mutex
);
107 * Called with sessions lock held.
109 int lttng_session_active(void)
111 struct lttng_session
*iter
;
113 list_for_each_entry(iter
, &sessions
, list
) {
120 struct lttng_session
*lttng_session_create(void)
122 struct lttng_session
*session
;
123 struct lttng_metadata_cache
*metadata_cache
;
126 mutex_lock(&sessions_mutex
);
127 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
130 INIT_LIST_HEAD(&session
->chan
);
131 INIT_LIST_HEAD(&session
->events
);
132 uuid_le_gen(&session
->uuid
);
134 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
137 goto err_free_session
;
138 metadata_cache
->data
= lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
139 if (!metadata_cache
->data
)
141 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
142 kref_init(&metadata_cache
->refcount
);
143 mutex_init(&metadata_cache
->lock
);
144 session
->metadata_cache
= metadata_cache
;
145 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
146 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
147 sizeof(metadata_cache
->uuid
));
148 INIT_LIST_HEAD(&session
->enablers_head
);
149 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
150 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
151 list_add(&session
->list
, &sessions
);
152 mutex_unlock(&sessions_mutex
);
156 kfree(metadata_cache
);
158 lttng_kvfree(session
);
160 mutex_unlock(&sessions_mutex
);
164 void metadata_cache_destroy(struct kref
*kref
)
166 struct lttng_metadata_cache
*cache
=
167 container_of(kref
, struct lttng_metadata_cache
, refcount
);
172 void lttng_session_destroy(struct lttng_session
*session
)
174 struct lttng_channel
*chan
, *tmpchan
;
175 struct lttng_event
*event
, *tmpevent
;
176 struct lttng_metadata_stream
*metadata_stream
;
177 struct lttng_enabler
*enabler
, *tmpenabler
;
180 mutex_lock(&sessions_mutex
);
181 WRITE_ONCE(session
->active
, 0);
182 list_for_each_entry(chan
, &session
->chan
, list
) {
183 ret
= lttng_syscalls_unregister(chan
);
186 list_for_each_entry(event
, &session
->events
, list
) {
187 ret
= _lttng_event_unregister(event
);
190 synchronize_trace(); /* Wait for in-flight events to complete */
191 list_for_each_entry_safe(enabler
, tmpenabler
,
192 &session
->enablers_head
, node
)
193 lttng_enabler_destroy(enabler
);
194 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
195 _lttng_event_destroy(event
);
196 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
197 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
198 _lttng_channel_destroy(chan
);
200 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
201 _lttng_metadata_channel_hangup(metadata_stream
);
202 if (session
->pid_tracker
)
203 lttng_pid_tracker_destroy(session
->pid_tracker
);
204 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
205 list_del(&session
->list
);
206 mutex_unlock(&sessions_mutex
);
207 lttng_kvfree(session
);
210 int lttng_session_statedump(struct lttng_session
*session
)
214 mutex_lock(&sessions_mutex
);
215 ret
= lttng_statedump_start(session
);
216 mutex_unlock(&sessions_mutex
);
220 int lttng_session_enable(struct lttng_session
*session
)
223 struct lttng_channel
*chan
;
225 mutex_lock(&sessions_mutex
);
226 if (session
->active
) {
231 /* Set transient enabler state to "enabled" */
235 * Snapshot the number of events per channel to know the type of header
238 list_for_each_entry(chan
, &session
->chan
, list
) {
239 if (chan
->header_type
)
240 continue; /* don't change it if session stop/restart */
241 if (chan
->free_event_id
< 31)
242 chan
->header_type
= 1; /* compact */
244 chan
->header_type
= 2; /* large */
247 /* We need to sync enablers with session before activation. */
248 lttng_session_sync_enablers(session
);
250 /* Clear each stream's quiescent state. */
251 list_for_each_entry(chan
, &session
->chan
, list
) {
252 if (chan
->channel_type
!= METADATA_CHANNEL
)
253 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
256 WRITE_ONCE(session
->active
, 1);
257 WRITE_ONCE(session
->been_active
, 1);
258 ret
= _lttng_session_metadata_statedump(session
);
260 WRITE_ONCE(session
->active
, 0);
263 ret
= lttng_statedump_start(session
);
265 WRITE_ONCE(session
->active
, 0);
267 mutex_unlock(&sessions_mutex
);
271 int lttng_session_disable(struct lttng_session
*session
)
274 struct lttng_channel
*chan
;
276 mutex_lock(&sessions_mutex
);
277 if (!session
->active
) {
281 WRITE_ONCE(session
->active
, 0);
283 /* Set transient enabler state to "disabled" */
285 lttng_session_sync_enablers(session
);
287 /* Set each stream's quiescent state. */
288 list_for_each_entry(chan
, &session
->chan
, list
) {
289 if (chan
->channel_type
!= METADATA_CHANNEL
)
290 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
293 mutex_unlock(&sessions_mutex
);
297 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
300 struct lttng_channel
*chan
;
301 struct lttng_event
*event
;
302 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
303 struct lttng_metadata_stream
*stream
;
305 mutex_lock(&sessions_mutex
);
306 if (!session
->active
) {
311 mutex_lock(&cache
->lock
);
312 memset(cache
->data
, 0, cache
->cache_alloc
);
313 cache
->metadata_written
= 0;
315 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
316 stream
->metadata_out
= 0;
317 stream
->metadata_in
= 0;
319 mutex_unlock(&cache
->lock
);
321 session
->metadata_dumped
= 0;
322 list_for_each_entry(chan
, &session
->chan
, list
) {
323 chan
->metadata_dumped
= 0;
326 list_for_each_entry(event
, &session
->events
, list
) {
327 event
->metadata_dumped
= 0;
330 ret
= _lttng_session_metadata_statedump(session
);
333 mutex_unlock(&sessions_mutex
);
337 int lttng_channel_enable(struct lttng_channel
*channel
)
341 mutex_lock(&sessions_mutex
);
342 if (channel
->channel_type
== METADATA_CHANNEL
) {
346 if (channel
->enabled
) {
350 /* Set transient enabler state to "enabled" */
352 lttng_session_sync_enablers(channel
->session
);
353 /* Set atomically the state to "enabled" */
354 WRITE_ONCE(channel
->enabled
, 1);
356 mutex_unlock(&sessions_mutex
);
360 int lttng_channel_disable(struct lttng_channel
*channel
)
364 mutex_lock(&sessions_mutex
);
365 if (channel
->channel_type
== METADATA_CHANNEL
) {
369 if (!channel
->enabled
) {
373 /* Set atomically the state to "disabled" */
374 WRITE_ONCE(channel
->enabled
, 0);
375 /* Set transient enabler state to "enabled" */
377 lttng_session_sync_enablers(channel
->session
);
379 mutex_unlock(&sessions_mutex
);
383 int lttng_event_enable(struct lttng_event
*event
)
387 mutex_lock(&sessions_mutex
);
388 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
392 if (event
->enabled
) {
396 switch (event
->instrumentation
) {
397 case LTTNG_KERNEL_TRACEPOINT
:
398 case LTTNG_KERNEL_SYSCALL
:
401 case LTTNG_KERNEL_KPROBE
:
402 case LTTNG_KERNEL_FUNCTION
:
403 case LTTNG_KERNEL_UPROBE
:
404 case LTTNG_KERNEL_NOOP
:
405 WRITE_ONCE(event
->enabled
, 1);
407 case LTTNG_KERNEL_KRETPROBE
:
408 ret
= lttng_kretprobes_event_enable_state(event
, 1);
415 mutex_unlock(&sessions_mutex
);
419 int lttng_event_disable(struct lttng_event
*event
)
423 mutex_lock(&sessions_mutex
);
424 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
428 if (!event
->enabled
) {
432 switch (event
->instrumentation
) {
433 case LTTNG_KERNEL_TRACEPOINT
:
434 case LTTNG_KERNEL_SYSCALL
:
437 case LTTNG_KERNEL_KPROBE
:
438 case LTTNG_KERNEL_FUNCTION
:
439 case LTTNG_KERNEL_UPROBE
:
440 case LTTNG_KERNEL_NOOP
:
441 WRITE_ONCE(event
->enabled
, 0);
443 case LTTNG_KERNEL_KRETPROBE
:
444 ret
= lttng_kretprobes_event_enable_state(event
, 0);
451 mutex_unlock(&sessions_mutex
);
455 static struct lttng_transport
*lttng_transport_find(const char *name
)
457 struct lttng_transport
*transport
;
459 list_for_each_entry(transport
, <tng_transport_list
, node
) {
460 if (!strcmp(transport
->name
, name
))
466 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
467 const char *transport_name
,
469 size_t subbuf_size
, size_t num_subbuf
,
470 unsigned int switch_timer_interval
,
471 unsigned int read_timer_interval
,
472 enum channel_type channel_type
)
474 struct lttng_channel
*chan
;
475 struct lttng_transport
*transport
= NULL
;
477 mutex_lock(&sessions_mutex
);
478 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
479 goto active
; /* Refuse to add channel to active session */
480 transport
= lttng_transport_find(transport_name
);
482 printk(KERN_WARNING
"LTTng transport %s not found\n",
486 if (!try_module_get(transport
->owner
)) {
487 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
490 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
493 chan
->session
= session
;
494 chan
->id
= session
->free_chan_id
++;
495 chan
->ops
= &transport
->ops
;
497 * Note: the channel creation op already writes into the packet
498 * headers. Therefore the "chan" information used as input
499 * should be already accessible.
501 chan
->chan
= transport
->ops
.channel_create(transport_name
,
502 chan
, buf_addr
, subbuf_size
, num_subbuf
,
503 switch_timer_interval
, read_timer_interval
);
508 chan
->transport
= transport
;
509 chan
->channel_type
= channel_type
;
510 list_add(&chan
->list
, &session
->chan
);
511 mutex_unlock(&sessions_mutex
);
518 module_put(transport
->owner
);
521 mutex_unlock(&sessions_mutex
);
526 * Only used internally at session destruction for per-cpu channels, and
527 * when metadata channel is released.
528 * Needs to be called with sessions mutex held.
531 void _lttng_channel_destroy(struct lttng_channel
*chan
)
533 chan
->ops
->channel_destroy(chan
->chan
);
534 module_put(chan
->transport
->owner
);
535 list_del(&chan
->list
);
536 lttng_destroy_context(chan
->ctx
);
540 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
542 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
544 /* Protect the metadata cache with the sessions_mutex. */
545 mutex_lock(&sessions_mutex
);
546 _lttng_channel_destroy(chan
);
547 mutex_unlock(&sessions_mutex
);
549 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
552 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
554 stream
->finalized
= 1;
555 wake_up_interruptible(&stream
->read_wait
);
559 * Supports event creation while tracing session is active.
560 * Needs to be called with sessions mutex held.
562 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
563 struct lttng_kernel_event
*event_param
,
565 const struct lttng_event_desc
*event_desc
,
566 enum lttng_kernel_instrumentation itype
)
568 struct lttng_session
*session
= chan
->session
;
569 struct lttng_event
*event
;
570 const char *event_name
;
571 struct hlist_head
*head
;
576 if (chan
->free_event_id
== -1U) {
582 case LTTNG_KERNEL_TRACEPOINT
:
583 event_name
= event_desc
->name
;
585 case LTTNG_KERNEL_KPROBE
:
586 case LTTNG_KERNEL_UPROBE
:
587 case LTTNG_KERNEL_KRETPROBE
:
588 case LTTNG_KERNEL_FUNCTION
:
589 case LTTNG_KERNEL_NOOP
:
590 case LTTNG_KERNEL_SYSCALL
:
591 event_name
= event_param
->name
;
598 name_len
= strlen(event_name
);
599 hash
= jhash(event_name
, name_len
, 0);
600 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
601 lttng_hlist_for_each_entry(event
, head
, hlist
) {
602 WARN_ON_ONCE(!event
->desc
);
603 if (!strncmp(event
->desc
->name
, event_name
,
604 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
605 && chan
== event
->chan
) {
611 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
617 event
->filter
= filter
;
618 event
->id
= chan
->free_event_id
++;
619 event
->instrumentation
= itype
;
620 event
->evtype
= LTTNG_TYPE_EVENT
;
621 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
622 INIT_LIST_HEAD(&event
->enablers_ref_head
);
625 case LTTNG_KERNEL_TRACEPOINT
:
626 /* Event will be enabled by enabler sync. */
628 event
->registered
= 0;
629 event
->desc
= lttng_event_get(event_name
);
634 /* Populate lttng_event structure before event registration. */
637 case LTTNG_KERNEL_KPROBE
:
639 * Needs to be explicitly enabled after creation, since
640 * we may want to apply filters.
643 event
->registered
= 1;
645 * Populate lttng_event structure before event
649 ret
= lttng_kprobes_register(event_name
,
650 event_param
->u
.kprobe
.symbol_name
,
651 event_param
->u
.kprobe
.offset
,
652 event_param
->u
.kprobe
.addr
,
658 ret
= try_module_get(event
->desc
->owner
);
661 case LTTNG_KERNEL_KRETPROBE
:
663 struct lttng_event
*event_return
;
665 /* kretprobe defines 2 events */
667 * Needs to be explicitly enabled after creation, since
668 * we may want to apply filters.
671 event
->registered
= 1;
673 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
678 event_return
->chan
= chan
;
679 event_return
->filter
= filter
;
680 event_return
->id
= chan
->free_event_id
++;
681 event_return
->enabled
= 0;
682 event_return
->registered
= 1;
683 event_return
->instrumentation
= itype
;
685 * Populate lttng_event structure before kretprobe registration.
688 ret
= lttng_kretprobes_register(event_name
,
689 event_param
->u
.kretprobe
.symbol_name
,
690 event_param
->u
.kretprobe
.offset
,
691 event_param
->u
.kretprobe
.addr
,
692 event
, event_return
);
694 kmem_cache_free(event_cache
, event_return
);
698 /* Take 2 refs on the module: one per event. */
699 ret
= try_module_get(event
->desc
->owner
);
701 ret
= try_module_get(event
->desc
->owner
);
703 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
705 WARN_ON_ONCE(ret
> 0);
707 kmem_cache_free(event_cache
, event_return
);
708 module_put(event
->desc
->owner
);
709 module_put(event
->desc
->owner
);
710 goto statedump_error
;
712 list_add(&event_return
->list
, &chan
->session
->events
);
715 case LTTNG_KERNEL_FUNCTION
:
717 * Needs to be explicitly enabled after creation, since
718 * we may want to apply filters.
721 event
->registered
= 1;
723 * Populate lttng_event structure before event
727 ret
= lttng_ftrace_register(event_name
,
728 event_param
->u
.ftrace
.symbol_name
,
733 ret
= try_module_get(event
->desc
->owner
);
736 case LTTNG_KERNEL_NOOP
:
737 case LTTNG_KERNEL_SYSCALL
:
739 * Needs to be explicitly enabled after creation, since
740 * we may want to apply filters.
743 event
->registered
= 0;
744 event
->desc
= event_desc
;
750 case LTTNG_KERNEL_UPROBE
:
752 * Needs to be explicitly enabled after creation, since
753 * we may want to apply filters.
756 event
->registered
= 1;
759 * Populate lttng_event structure before event
764 ret
= lttng_uprobes_register(event_param
->name
,
765 event_param
->u
.uprobe
.fd
,
769 ret
= try_module_get(event
->desc
->owner
);
777 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
778 WARN_ON_ONCE(ret
> 0);
780 goto statedump_error
;
782 hlist_add_head(&event
->hlist
, head
);
783 list_add(&event
->list
, &chan
->session
->events
);
787 /* If a statedump error occurs, events will not be readable. */
789 kmem_cache_free(event_cache
, event
);
797 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
798 struct lttng_kernel_event
*event_param
,
800 const struct lttng_event_desc
*event_desc
,
801 enum lttng_kernel_instrumentation itype
)
803 struct lttng_event
*event
;
805 mutex_lock(&sessions_mutex
);
806 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
808 mutex_unlock(&sessions_mutex
);
812 /* Only used for tracepoints for now. */
814 void register_event(struct lttng_event
*event
)
816 const struct lttng_event_desc
*desc
;
819 if (event
->registered
)
823 switch (event
->instrumentation
) {
824 case LTTNG_KERNEL_TRACEPOINT
:
825 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
826 desc
->probe_callback
,
829 case LTTNG_KERNEL_SYSCALL
:
830 ret
= lttng_syscall_filter_enable(event
->chan
,
833 case LTTNG_KERNEL_KPROBE
:
834 case LTTNG_KERNEL_UPROBE
:
835 case LTTNG_KERNEL_KRETPROBE
:
836 case LTTNG_KERNEL_FUNCTION
:
837 case LTTNG_KERNEL_NOOP
:
844 event
->registered
= 1;
848 * Only used internally at session destruction.
850 int _lttng_event_unregister(struct lttng_event
*event
)
852 const struct lttng_event_desc
*desc
;
855 if (!event
->registered
)
859 switch (event
->instrumentation
) {
860 case LTTNG_KERNEL_TRACEPOINT
:
861 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
862 event
->desc
->probe_callback
,
865 case LTTNG_KERNEL_KPROBE
:
866 lttng_kprobes_unregister(event
);
869 case LTTNG_KERNEL_KRETPROBE
:
870 lttng_kretprobes_unregister(event
);
873 case LTTNG_KERNEL_FUNCTION
:
874 lttng_ftrace_unregister(event
);
877 case LTTNG_KERNEL_SYSCALL
:
878 ret
= lttng_syscall_filter_disable(event
->chan
,
881 case LTTNG_KERNEL_NOOP
:
884 case LTTNG_KERNEL_UPROBE
:
885 lttng_uprobes_unregister(event
);
892 event
->registered
= 0;
897 * Only used internally at session destruction.
900 void _lttng_event_destroy(struct lttng_event
*event
)
902 switch (event
->instrumentation
) {
903 case LTTNG_KERNEL_TRACEPOINT
:
904 lttng_event_put(event
->desc
);
906 case LTTNG_KERNEL_KPROBE
:
907 module_put(event
->desc
->owner
);
908 lttng_kprobes_destroy_private(event
);
910 case LTTNG_KERNEL_KRETPROBE
:
911 module_put(event
->desc
->owner
);
912 lttng_kretprobes_destroy_private(event
);
914 case LTTNG_KERNEL_FUNCTION
:
915 module_put(event
->desc
->owner
);
916 lttng_ftrace_destroy_private(event
);
918 case LTTNG_KERNEL_NOOP
:
919 case LTTNG_KERNEL_SYSCALL
:
921 case LTTNG_KERNEL_UPROBE
:
922 module_put(event
->desc
->owner
);
923 lttng_uprobes_destroy_private(event
);
928 list_del(&event
->list
);
929 lttng_destroy_context(event
->ctx
);
930 kmem_cache_free(event_cache
, event
);
933 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
939 mutex_lock(&sessions_mutex
);
941 /* track all pids: destroy tracker. */
942 if (session
->pid_tracker
) {
943 struct lttng_pid_tracker
*lpf
;
945 lpf
= session
->pid_tracker
;
946 rcu_assign_pointer(session
->pid_tracker
, NULL
);
948 lttng_pid_tracker_destroy(lpf
);
952 if (!session
->pid_tracker
) {
953 struct lttng_pid_tracker
*lpf
;
955 lpf
= lttng_pid_tracker_create();
960 ret
= lttng_pid_tracker_add(lpf
, pid
);
961 rcu_assign_pointer(session
->pid_tracker
, lpf
);
963 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
967 mutex_unlock(&sessions_mutex
);
971 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
977 mutex_lock(&sessions_mutex
);
979 /* untrack all pids: replace by empty tracker. */
980 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
981 struct lttng_pid_tracker
*lpf
;
983 lpf
= lttng_pid_tracker_create();
988 rcu_assign_pointer(session
->pid_tracker
, lpf
);
991 lttng_pid_tracker_destroy(old_lpf
);
994 if (!session
->pid_tracker
) {
998 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
1001 mutex_unlock(&sessions_mutex
);
1006 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
1008 struct lttng_session
*session
= m
->private;
1009 struct lttng_pid_tracker
*lpf
;
1010 struct lttng_pid_hash_node
*e
;
1013 mutex_lock(&sessions_mutex
);
1014 lpf
= session
->pid_tracker
;
1016 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1017 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1019 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1025 /* PID tracker disabled. */
1026 if (iter
>= *pos
&& iter
== 0) {
1027 return session
; /* empty tracker */
1035 /* Called with sessions_mutex held. */
1037 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1039 struct lttng_session
*session
= m
->private;
1040 struct lttng_pid_tracker
*lpf
;
1041 struct lttng_pid_hash_node
*e
;
1045 lpf
= session
->pid_tracker
;
1047 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1048 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1050 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1051 if (iter
++ >= *ppos
)
1056 /* PID tracker disabled. */
1057 if (iter
>= *ppos
&& iter
== 0)
1058 return session
; /* empty tracker */
1067 void pid_list_stop(struct seq_file
*m
, void *p
)
1069 mutex_unlock(&sessions_mutex
);
1073 int pid_list_show(struct seq_file
*m
, void *p
)
1077 if (p
== m
->private) {
1078 /* Tracker disabled. */
1081 const struct lttng_pid_hash_node
*e
= p
;
1083 pid
= lttng_pid_tracker_get_node_pid(e
);
1085 seq_printf(m
, "process { pid = %d; };\n", pid
);
1090 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1091 .start
= pid_list_start
,
1092 .next
= pid_list_next
,
1093 .stop
= pid_list_stop
,
1094 .show
= pid_list_show
,
1098 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1100 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1104 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1106 struct seq_file
*m
= file
->private_data
;
1107 struct lttng_session
*session
= m
->private;
1110 WARN_ON_ONCE(!session
);
1111 ret
= seq_release(inode
, file
);
1112 if (!ret
&& session
)
1113 fput(session
->file
);
1117 const struct file_operations lttng_tracker_pids_list_fops
= {
1118 .owner
= THIS_MODULE
,
1119 .open
= lttng_tracker_pids_list_open
,
1121 .llseek
= seq_lseek
,
1122 .release
= lttng_tracker_pids_list_release
,
1125 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1127 struct file
*tracker_pids_list_file
;
1131 file_fd
= lttng_get_unused_fd();
1137 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1138 <tng_tracker_pids_list_fops
,
1140 if (IS_ERR(tracker_pids_list_file
)) {
1141 ret
= PTR_ERR(tracker_pids_list_file
);
1144 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1146 goto refcount_error
;
1148 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1151 m
= tracker_pids_list_file
->private_data
;
1152 m
->private = session
;
1153 fd_install(file_fd
, tracker_pids_list_file
);
1158 atomic_long_dec(&session
->file
->f_count
);
1160 fput(tracker_pids_list_file
);
1162 put_unused_fd(file_fd
);
1168 * Enabler management.
1171 int lttng_match_enabler_star_glob(const char *desc_name
,
1172 const char *pattern
)
1174 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1175 desc_name
, LTTNG_SIZE_MAX
))
1181 int lttng_match_enabler_name(const char *desc_name
,
1184 if (strcmp(desc_name
, name
))
1190 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1191 struct lttng_enabler
*enabler
)
1193 const char *desc_name
, *enabler_name
;
1195 enabler_name
= enabler
->event_param
.name
;
1196 switch (enabler
->event_param
.instrumentation
) {
1197 case LTTNG_KERNEL_TRACEPOINT
:
1198 desc_name
= desc
->name
;
1200 case LTTNG_KERNEL_SYSCALL
:
1201 desc_name
= desc
->name
;
1202 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1203 desc_name
+= strlen("compat_");
1204 if (!strncmp(desc_name
, "syscall_exit_",
1205 strlen("syscall_exit_"))) {
1206 desc_name
+= strlen("syscall_exit_");
1207 } else if (!strncmp(desc_name
, "syscall_entry_",
1208 strlen("syscall_entry_"))) {
1209 desc_name
+= strlen("syscall_entry_");
1219 switch (enabler
->type
) {
1220 case LTTNG_ENABLER_STAR_GLOB
:
1221 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1222 case LTTNG_ENABLER_NAME
:
1223 return lttng_match_enabler_name(desc_name
, enabler_name
);
1230 int lttng_event_match_enabler(struct lttng_event
*event
,
1231 struct lttng_enabler
*enabler
)
1233 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1235 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1236 && event
->chan
== enabler
->chan
)
1243 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1244 struct lttng_enabler
*enabler
)
1246 struct lttng_enabler_ref
*enabler_ref
;
1248 list_for_each_entry(enabler_ref
,
1249 &event
->enablers_ref_head
, node
) {
1250 if (enabler_ref
->ref
== enabler
)
1257 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1259 struct lttng_session
*session
= enabler
->chan
->session
;
1260 struct lttng_probe_desc
*probe_desc
;
1261 const struct lttng_event_desc
*desc
;
1263 struct list_head
*probe_list
;
1265 probe_list
= lttng_get_probe_list_head();
1267 * For each probe event, if we find that a probe event matches
1268 * our enabler, create an associated lttng_event if not
1271 list_for_each_entry(probe_desc
, probe_list
, head
) {
1272 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1274 struct hlist_head
*head
;
1275 const char *event_name
;
1278 struct lttng_event
*event
;
1280 desc
= probe_desc
->event_desc
[i
];
1281 if (!lttng_desc_match_enabler(desc
, enabler
))
1283 event_name
= desc
->name
;
1284 name_len
= strlen(event_name
);
1287 * Check if already created.
1289 hash
= jhash(event_name
, name_len
, 0);
1290 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1291 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1292 if (event
->desc
== desc
1293 && event
->chan
== enabler
->chan
)
1300 * We need to create an event for this
1303 event
= _lttng_event_create(enabler
->chan
,
1305 LTTNG_KERNEL_TRACEPOINT
);
1307 printk(KERN_INFO
"Unable to create event %s\n",
1308 probe_desc
->event_desc
[i
]->name
);
1315 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1319 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1324 * Create struct lttng_event if it is missing and present in the list of
1325 * tracepoint probes.
1326 * Should be called with sessions mutex held.
1329 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1331 switch (enabler
->event_param
.instrumentation
) {
1332 case LTTNG_KERNEL_TRACEPOINT
:
1333 lttng_create_tracepoint_if_missing(enabler
);
1335 case LTTNG_KERNEL_SYSCALL
:
1336 lttng_create_syscall_if_missing(enabler
);
1345 * Create events associated with an enabler (if not already present),
1346 * and add backward reference from the event to the enabler.
1347 * Should be called with sessions mutex held.
1350 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1352 struct lttng_session
*session
= enabler
->chan
->session
;
1353 struct lttng_event
*event
;
1355 /* First ensure that probe events are created for this enabler. */
1356 lttng_create_event_if_missing(enabler
);
1358 /* For each event matching enabler in session event list. */
1359 list_for_each_entry(event
, &session
->events
, list
) {
1360 struct lttng_enabler_ref
*enabler_ref
;
1362 if (!lttng_event_match_enabler(event
, enabler
))
1364 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1367 * If no backward ref, create it.
1368 * Add backward ref from event to enabler.
1370 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1373 enabler_ref
->ref
= enabler
;
1374 list_add(&enabler_ref
->node
,
1375 &event
->enablers_ref_head
);
1379 * Link filter bytecodes if not linked yet.
1381 lttng_enabler_event_link_bytecode(event
, enabler
);
1383 /* TODO: merge event context. */
1389 * Called at module load: connect the probe on all enablers matching
1391 * Called with sessions lock held.
1393 int lttng_fix_pending_events(void)
1395 struct lttng_session
*session
;
1397 list_for_each_entry(session
, &sessions
, list
)
1398 lttng_session_lazy_sync_enablers(session
);
1402 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1403 struct lttng_kernel_event
*event_param
,
1404 struct lttng_channel
*chan
)
1406 struct lttng_enabler
*enabler
;
1408 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1411 enabler
->type
= type
;
1412 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1413 memcpy(&enabler
->event_param
, event_param
,
1414 sizeof(enabler
->event_param
));
1415 enabler
->chan
= chan
;
1417 enabler
->enabled
= 0;
1418 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1419 mutex_lock(&sessions_mutex
);
1420 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1421 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1422 mutex_unlock(&sessions_mutex
);
1426 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1428 mutex_lock(&sessions_mutex
);
1429 enabler
->enabled
= 1;
1430 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1431 mutex_unlock(&sessions_mutex
);
1435 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1437 mutex_lock(&sessions_mutex
);
1438 enabler
->enabled
= 0;
1439 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1440 mutex_unlock(&sessions_mutex
);
1444 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1445 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1447 struct lttng_filter_bytecode_node
*bytecode_node
;
1448 uint32_t bytecode_len
;
1451 ret
= get_user(bytecode_len
, &bytecode
->len
);
1454 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1458 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1459 sizeof(*bytecode
) + bytecode_len
);
1462 bytecode_node
->enabler
= enabler
;
1463 /* Enforce length based on allocated size */
1464 bytecode_node
->bc
.len
= bytecode_len
;
1465 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1466 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1470 kfree(bytecode_node
);
1474 int lttng_event_add_callsite(struct lttng_event
*event
,
1475 struct lttng_kernel_event_callsite __user
*callsite
)
1478 switch (event
->instrumentation
) {
1479 case LTTNG_KERNEL_UPROBE
:
1480 return lttng_uprobes_add_callsite(event
, callsite
);
1486 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1487 struct lttng_kernel_context
*context_param
)
1493 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1495 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1497 /* Destroy filter bytecode */
1498 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1499 &enabler
->filter_bytecode_head
, node
) {
1503 /* Destroy contexts */
1504 lttng_destroy_context(enabler
->ctx
);
1506 list_del(&enabler
->node
);
1511 * lttng_session_sync_enablers should be called just before starting a
1513 * Should be called with sessions mutex held.
1516 void lttng_session_sync_enablers(struct lttng_session
*session
)
1518 struct lttng_enabler
*enabler
;
1519 struct lttng_event
*event
;
1521 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1522 lttng_enabler_ref_events(enabler
);
1524 * For each event, if at least one of its enablers is enabled,
1525 * and its channel and session transient states are enabled, we
1526 * enable the event, else we disable it.
1528 list_for_each_entry(event
, &session
->events
, list
) {
1529 struct lttng_enabler_ref
*enabler_ref
;
1530 struct lttng_bytecode_runtime
*runtime
;
1531 int enabled
= 0, has_enablers_without_bytecode
= 0;
1533 switch (event
->instrumentation
) {
1534 case LTTNG_KERNEL_TRACEPOINT
:
1535 case LTTNG_KERNEL_SYSCALL
:
1537 list_for_each_entry(enabler_ref
,
1538 &event
->enablers_ref_head
, node
) {
1539 if (enabler_ref
->ref
->enabled
) {
1546 /* Not handled with lazy sync. */
1550 * Enabled state is based on union of enablers, with
1551 * intesection of session and channel transient enable
1554 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1556 WRITE_ONCE(event
->enabled
, enabled
);
1558 * Sync tracepoint registration with event enabled
1562 register_event(event
);
1564 _lttng_event_unregister(event
);
1567 /* Check if has enablers without bytecode enabled */
1568 list_for_each_entry(enabler_ref
,
1569 &event
->enablers_ref_head
, node
) {
1570 if (enabler_ref
->ref
->enabled
1571 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1572 has_enablers_without_bytecode
= 1;
1576 event
->has_enablers_without_bytecode
=
1577 has_enablers_without_bytecode
;
1579 /* Enable filters */
1580 list_for_each_entry(runtime
,
1581 &event
->bytecode_runtime_head
, node
)
1582 lttng_filter_sync_state(runtime
);
1587 * Apply enablers to session events, adding events to session if need
1588 * be. It is required after each modification applied to an active
1589 * session, and right before session "start".
1590 * "lazy" sync means we only sync if required.
1591 * Should be called with sessions mutex held.
1594 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1596 /* We can skip if session is not active */
1597 if (!session
->active
)
1599 lttng_session_sync_enablers(session
);
1603 * Serialize at most one packet worth of metadata into a metadata
1605 * We grab the metadata cache mutex to get exclusive access to our metadata
1606 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1607 * allows us to do racy operations such as looking for remaining space left in
1608 * packet and write, since mutual exclusion protects us from concurrent writes.
1609 * Mutual exclusion on the metadata cache allow us to read the cache content
1610 * without racing against reallocation of the cache by updates.
1611 * Returns the number of bytes written in the channel, 0 if no data
1612 * was written and a negative value on error.
1614 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1615 struct channel
*chan
)
1617 struct lib_ring_buffer_ctx ctx
;
1619 size_t len
, reserve_len
;
1622 * Ensure we support mutiple get_next / put sequences followed by
1623 * put_next. The metadata cache lock protects reading the metadata
1624 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1625 * "flush" operations on the buffer invoked by different processes.
1626 * Moreover, since the metadata cache memory can be reallocated, we
1627 * need to have exclusive access against updates even though we only
1630 mutex_lock(&stream
->metadata_cache
->lock
);
1631 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1632 if (stream
->metadata_in
!= stream
->metadata_out
)
1635 /* Metadata regenerated, change the version. */
1636 if (stream
->metadata_cache
->version
!= stream
->version
)
1637 stream
->version
= stream
->metadata_cache
->version
;
1639 len
= stream
->metadata_cache
->metadata_written
-
1640 stream
->metadata_in
;
1643 reserve_len
= min_t(size_t,
1644 stream
->transport
->ops
.packet_avail_size(chan
),
1646 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1649 * If reservation failed, return an error to the caller.
1651 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1653 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1656 stream
->transport
->ops
.event_write(&ctx
,
1657 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1659 stream
->transport
->ops
.event_commit(&ctx
);
1660 stream
->metadata_in
+= reserve_len
;
1664 mutex_unlock(&stream
->metadata_cache
->lock
);
1669 * Write the metadata to the metadata cache.
1670 * Must be called with sessions_mutex held.
1671 * The metadata cache lock protects us from concurrent read access from
1672 * thread outputting metadata content to ring buffer.
1674 int lttng_metadata_printf(struct lttng_session
*session
,
1675 const char *fmt
, ...)
1680 struct lttng_metadata_stream
*stream
;
1682 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1685 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1691 mutex_lock(&session
->metadata_cache
->lock
);
1692 if (session
->metadata_cache
->metadata_written
+ len
>
1693 session
->metadata_cache
->cache_alloc
) {
1694 char *tmp_cache_realloc
;
1695 unsigned int tmp_cache_alloc_size
;
1697 tmp_cache_alloc_size
= max_t(unsigned int,
1698 session
->metadata_cache
->cache_alloc
+ len
,
1699 session
->metadata_cache
->cache_alloc
<< 1);
1700 tmp_cache_realloc
= lttng_vzalloc(tmp_cache_alloc_size
);
1701 if (!tmp_cache_realloc
)
1703 if (session
->metadata_cache
->data
) {
1704 memcpy(tmp_cache_realloc
,
1705 session
->metadata_cache
->data
,
1706 session
->metadata_cache
->cache_alloc
);
1707 vfree(session
->metadata_cache
->data
);
1710 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1711 session
->metadata_cache
->data
= tmp_cache_realloc
;
1713 memcpy(session
->metadata_cache
->data
+
1714 session
->metadata_cache
->metadata_written
,
1716 session
->metadata_cache
->metadata_written
+= len
;
1717 mutex_unlock(&session
->metadata_cache
->lock
);
1720 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1721 wake_up_interruptible(&stream
->read_wait
);
1726 mutex_unlock(&session
->metadata_cache
->lock
);
1732 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1736 for (i
= 0; i
< nesting
; i
++) {
1739 ret
= lttng_metadata_printf(session
, " ");
1748 * Must be called with sessions_mutex held.
1751 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1752 const struct lttng_type
*type
,
1756 uint32_t i
, nr_fields
;
1758 ret
= print_tabs(session
, nesting
);
1761 ret
= lttng_metadata_printf(session
,
1765 nr_fields
= type
->u
._struct
.nr_fields
;
1766 for (i
= 0; i
< nr_fields
; i
++) {
1767 const struct lttng_event_field
*iter_field
;
1769 iter_field
= &type
->u
._struct
.fields
[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_struct_statedump(struct lttng_session
*session
,
1787 const struct lttng_event_field
*field
,
1792 ret
= _lttng_struct_type_statedump(session
,
1793 &field
->type
, nesting
);
1796 ret
= lttng_metadata_printf(session
,
1803 * Must be called with sessions_mutex held.
1806 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1807 const struct lttng_type
*type
,
1811 uint32_t i
, nr_choices
;
1813 ret
= print_tabs(session
, nesting
);
1816 ret
= lttng_metadata_printf(session
,
1817 "variant <_%s> {\n",
1818 type
->u
.variant
.tag_name
);
1821 nr_choices
= type
->u
.variant
.nr_choices
;
1822 for (i
= 0; i
< nr_choices
; i
++) {
1823 const struct lttng_event_field
*iter_field
;
1825 iter_field
= &type
->u
.variant
.choices
[i
];
1826 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1830 ret
= print_tabs(session
, nesting
);
1833 ret
= lttng_metadata_printf(session
,
1839 * Must be called with sessions_mutex held.
1842 int _lttng_variant_statedump(struct lttng_session
*session
,
1843 const struct lttng_event_field
*field
,
1848 ret
= _lttng_variant_type_statedump(session
,
1849 &field
->type
, nesting
);
1852 ret
= lttng_metadata_printf(session
,
1859 * Must be called with sessions_mutex held.
1862 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1863 const struct lttng_event_field
*field
,
1867 const struct lttng_type
*elem_type
;
1869 /* Only array of structures and variants are currently supported. */
1870 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1871 switch (elem_type
->atype
) {
1873 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1878 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1885 ret
= lttng_metadata_printf(session
,
1888 field
->type
.u
.array_compound
.length
);
1893 * Must be called with sessions_mutex held.
1896 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1897 const struct lttng_event_field
*field
,
1901 const char *length_name
;
1902 const struct lttng_type
*elem_type
;
1904 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1906 /* Only array of structures and variants are currently supported. */
1907 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1908 switch (elem_type
->atype
) {
1910 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1915 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1922 ret
= lttng_metadata_printf(session
,
1930 * Must be called with sessions_mutex held.
1933 int _lttng_enum_statedump(struct lttng_session
*session
,
1934 const struct lttng_event_field
*field
,
1937 const struct lttng_enum_desc
*enum_desc
;
1938 const struct lttng_integer_type
*container_type
;
1940 unsigned int i
, nr_entries
;
1942 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1943 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1944 nr_entries
= enum_desc
->nr_entries
;
1946 ret
= print_tabs(session
, nesting
);
1949 ret
= lttng_metadata_printf(session
,
1950 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1951 container_type
->size
,
1952 container_type
->alignment
,
1953 container_type
->signedness
,
1954 (container_type
->encoding
== lttng_encode_none
)
1956 : (container_type
->encoding
== lttng_encode_UTF8
)
1959 container_type
->base
,
1960 #if __BYTE_ORDER == __BIG_ENDIAN
1961 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1963 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1968 /* Dump all entries */
1969 for (i
= 0; i
< nr_entries
; i
++) {
1970 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1973 ret
= print_tabs(session
, nesting
+ 1);
1976 ret
= lttng_metadata_printf(session
,
1980 len
= strlen(entry
->string
);
1981 /* Escape the character '"' */
1982 for (j
= 0; j
< len
; j
++) {
1983 char c
= entry
->string
[j
];
1987 ret
= lttng_metadata_printf(session
,
1991 ret
= lttng_metadata_printf(session
,
1995 ret
= lttng_metadata_printf(session
,
2002 ret
= lttng_metadata_printf(session
, "\"");
2006 if (entry
->options
.is_auto
) {
2007 ret
= lttng_metadata_printf(session
, ",\n");
2011 ret
= lttng_metadata_printf(session
,
2015 if (entry
->start
.signedness
)
2016 ret
= lttng_metadata_printf(session
,
2017 "%lld", (long long) entry
->start
.value
);
2019 ret
= lttng_metadata_printf(session
,
2020 "%llu", entry
->start
.value
);
2023 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2025 == entry
->end
.value
) {
2026 ret
= lttng_metadata_printf(session
,
2029 if (entry
->end
.signedness
) {
2030 ret
= lttng_metadata_printf(session
,
2032 (long long) entry
->end
.value
);
2034 ret
= lttng_metadata_printf(session
,
2043 ret
= print_tabs(session
, nesting
);
2046 ret
= lttng_metadata_printf(session
, "} _%s;\n",
2053 * Must be called with sessions_mutex held.
2056 int _lttng_field_statedump(struct lttng_session
*session
,
2057 const struct lttng_event_field
*field
,
2062 switch (field
->type
.atype
) {
2064 ret
= print_tabs(session
, nesting
);
2067 ret
= lttng_metadata_printf(session
,
2068 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2069 field
->type
.u
.basic
.integer
.size
,
2070 field
->type
.u
.basic
.integer
.alignment
,
2071 field
->type
.u
.basic
.integer
.signedness
,
2072 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2074 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2077 field
->type
.u
.basic
.integer
.base
,
2078 #if __BYTE_ORDER == __BIG_ENDIAN
2079 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2081 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2086 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2089 case atype_array_bitfield
:
2091 const struct lttng_basic_type
*elem_type
;
2093 elem_type
= &field
->type
.u
.array
.elem_type
;
2094 if (field
->type
.u
.array
.elem_alignment
) {
2095 ret
= print_tabs(session
, nesting
);
2098 ret
= lttng_metadata_printf(session
,
2099 "struct { } align(%u) _%s_padding;\n",
2100 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2105 ret
= print_tabs(session
, nesting
);
2108 ret
= lttng_metadata_printf(session
,
2109 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2110 elem_type
->u
.basic
.integer
.size
,
2111 elem_type
->u
.basic
.integer
.alignment
,
2112 elem_type
->u
.basic
.integer
.signedness
,
2113 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2115 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2118 elem_type
->u
.basic
.integer
.base
,
2119 #if __BYTE_ORDER == __BIG_ENDIAN
2120 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2122 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2124 field
->name
, field
->type
.u
.array
.length
);
2127 case atype_sequence
:
2128 case atype_sequence_bitfield
:
2130 const struct lttng_basic_type
*elem_type
;
2131 const struct lttng_basic_type
*length_type
;
2133 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2134 length_type
= &field
->type
.u
.sequence
.length_type
;
2135 ret
= print_tabs(session
, nesting
);
2138 ret
= lttng_metadata_printf(session
,
2139 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2140 length_type
->u
.basic
.integer
.size
,
2141 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2142 length_type
->u
.basic
.integer
.signedness
,
2143 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2145 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2148 length_type
->u
.basic
.integer
.base
,
2149 #if __BYTE_ORDER == __BIG_ENDIAN
2150 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2152 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2158 if (field
->type
.u
.sequence
.elem_alignment
) {
2159 ret
= print_tabs(session
, nesting
);
2162 ret
= lttng_metadata_printf(session
,
2163 "struct { } align(%u) _%s_padding;\n",
2164 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2169 ret
= print_tabs(session
, nesting
);
2172 ret
= lttng_metadata_printf(session
,
2173 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2174 elem_type
->u
.basic
.integer
.size
,
2175 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2176 elem_type
->u
.basic
.integer
.signedness
,
2177 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2179 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2182 elem_type
->u
.basic
.integer
.base
,
2183 #if __BYTE_ORDER == __BIG_ENDIAN
2184 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2186 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2194 /* Default encoding is UTF8 */
2195 ret
= print_tabs(session
, nesting
);
2198 ret
= lttng_metadata_printf(session
,
2200 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2201 " { encoding = ASCII; }" : "",
2205 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2207 case atype_array_compound
:
2208 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2210 case atype_sequence_compound
:
2211 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2214 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2225 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2226 struct lttng_ctx
*ctx
)
2233 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2234 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2236 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2244 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2245 struct lttng_event
*event
)
2247 const struct lttng_event_desc
*desc
= event
->desc
;
2251 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2252 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2254 ret
= _lttng_field_statedump(session
, field
, 2);
2262 * Must be called with sessions_mutex held.
2265 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2266 struct lttng_channel
*chan
,
2267 struct lttng_event
*event
)
2271 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2273 if (chan
->channel_type
== METADATA_CHANNEL
)
2276 ret
= lttng_metadata_printf(session
,
2280 " stream_id = %u;\n",
2288 ret
= lttng_metadata_printf(session
,
2289 " context := struct {\n");
2293 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2297 ret
= lttng_metadata_printf(session
,
2303 ret
= lttng_metadata_printf(session
,
2304 " fields := struct {\n"
2309 ret
= _lttng_fields_metadata_statedump(session
, event
);
2314 * LTTng space reservation can only reserve multiples of the
2317 ret
= lttng_metadata_printf(session
,
2323 event
->metadata_dumped
= 1;
2330 * Must be called with sessions_mutex held.
2333 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2334 struct lttng_channel
*chan
)
2338 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2341 if (chan
->channel_type
== METADATA_CHANNEL
)
2344 WARN_ON_ONCE(!chan
->header_type
);
2345 ret
= lttng_metadata_printf(session
,
2348 " event.header := %s;\n"
2349 " packet.context := struct packet_context;\n",
2351 chan
->header_type
== 1 ? "struct event_header_compact" :
2352 "struct event_header_large");
2357 ret
= lttng_metadata_printf(session
,
2358 " event.context := struct {\n");
2362 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2366 ret
= lttng_metadata_printf(session
,
2372 ret
= lttng_metadata_printf(session
,
2375 chan
->metadata_dumped
= 1;
2381 * Must be called with sessions_mutex held.
2384 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2386 return lttng_metadata_printf(session
,
2387 "struct packet_context {\n"
2388 " uint64_clock_monotonic_t timestamp_begin;\n"
2389 " uint64_clock_monotonic_t timestamp_end;\n"
2390 " uint64_t content_size;\n"
2391 " uint64_t packet_size;\n"
2392 " uint64_t packet_seq_num;\n"
2393 " unsigned long events_discarded;\n"
2394 " uint32_t cpu_id;\n"
2401 * id: range: 0 - 30.
2402 * id 31 is reserved to indicate an extended header.
2405 * id: range: 0 - 65534.
2406 * id 65535 is reserved to indicate an extended header.
2408 * Must be called with sessions_mutex held.
2411 int _lttng_event_header_declare(struct lttng_session
*session
)
2413 return lttng_metadata_printf(session
,
2414 "struct event_header_compact {\n"
2415 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2418 " uint27_clock_monotonic_t timestamp;\n"
2422 " uint64_clock_monotonic_t timestamp;\n"
2427 "struct event_header_large {\n"
2428 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2431 " uint32_clock_monotonic_t timestamp;\n"
2435 " uint64_clock_monotonic_t timestamp;\n"
2439 lttng_alignof(uint32_t) * CHAR_BIT
,
2440 lttng_alignof(uint16_t) * CHAR_BIT
2445 * Approximation of NTP time of day to clock monotonic correlation,
2446 * taken at start of trace.
2447 * Yes, this is only an approximation. Yes, we can (and will) do better
2448 * in future versions.
2449 * This function may return a negative offset. It may happen if the
2450 * system sets the REALTIME clock to 0 after boot.
2453 int64_t measure_clock_offset(void)
2455 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2456 uint64_t tcf
= trace_clock_freq();
2458 struct timespec rts
= { 0, 0 };
2459 unsigned long flags
;
2461 /* Disable interrupts to increase correlation precision. */
2462 local_irq_save(flags
);
2463 monotonic
[0] = trace_clock_read64();
2464 getnstimeofday(&rts
);
2465 monotonic
[1] = trace_clock_read64();
2466 local_irq_restore(flags
);
2468 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2469 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2470 if (tcf
== NSEC_PER_SEC
) {
2471 realtime
+= rts
.tv_nsec
;
2473 uint64_t n
= rts
.tv_nsec
* tcf
;
2475 do_div(n
, NSEC_PER_SEC
);
2478 offset
= (int64_t) realtime
- monotonic_avg
;
2483 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
2491 while (cur
!= '\0') {
2494 ret
= lttng_metadata_printf(session
, "%s", "\\n");
2498 ret
= lttng_metadata_printf(session
, "%c", '\\');
2501 /* We still print the current char */
2504 ret
= lttng_metadata_printf(session
, "%c", cur
);
2518 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
2519 const char *field_value
)
2523 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
2527 ret
= print_escaped_ctf_string(session
, field_value
);
2531 ret
= lttng_metadata_printf(session
, "\";\n");
2538 * Output metadata into this session's metadata buffers.
2539 * Must be called with sessions_mutex held.
2542 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2544 unsigned char *uuid_c
= session
->uuid
.b
;
2545 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2546 struct lttng_channel
*chan
;
2547 struct lttng_event
*event
;
2550 if (!READ_ONCE(session
->active
))
2552 if (session
->metadata_dumped
)
2555 snprintf(uuid_s
, sizeof(uuid_s
),
2556 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2557 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2558 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2559 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2560 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2562 ret
= lttng_metadata_printf(session
,
2563 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2564 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2565 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2566 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2567 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2568 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2569 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2575 " byte_order = %s;\n"
2576 " packet.header := struct {\n"
2577 " uint32_t magic;\n"
2578 " uint8_t uuid[16];\n"
2579 " uint32_t stream_id;\n"
2580 " uint64_t stream_instance_id;\n"
2583 lttng_alignof(uint8_t) * CHAR_BIT
,
2584 lttng_alignof(uint16_t) * CHAR_BIT
,
2585 lttng_alignof(uint32_t) * CHAR_BIT
,
2586 lttng_alignof(uint64_t) * CHAR_BIT
,
2587 sizeof(unsigned long) * CHAR_BIT
,
2588 lttng_alignof(unsigned long) * CHAR_BIT
,
2592 #if __BYTE_ORDER == __BIG_ENDIAN
2601 ret
= lttng_metadata_printf(session
,
2603 " hostname = \"%s\";\n"
2604 " domain = \"kernel\";\n"
2605 " sysname = \"%s\";\n"
2606 " kernel_release = \"%s\";\n"
2607 " kernel_version = \"%s\";\n"
2608 " tracer_name = \"lttng-modules\";\n"
2609 " tracer_major = %d;\n"
2610 " tracer_minor = %d;\n"
2611 " tracer_patchlevel = %d;\n"
2612 " trace_buffering_scheme = \"global\";\n",
2613 current
->nsproxy
->uts_ns
->name
.nodename
,
2617 LTTNG_MODULES_MAJOR_VERSION
,
2618 LTTNG_MODULES_MINOR_VERSION
,
2619 LTTNG_MODULES_PATCHLEVEL_VERSION
2624 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
2627 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
2628 session
->creation_time
);
2633 ret
= lttng_metadata_printf(session
, "};\n\n");
2637 ret
= lttng_metadata_printf(session
,
2639 " name = \"%s\";\n",
2645 if (!trace_clock_uuid(clock_uuid_s
)) {
2646 ret
= lttng_metadata_printf(session
,
2647 " uuid = \"%s\";\n",
2654 ret
= lttng_metadata_printf(session
,
2655 " description = \"%s\";\n"
2656 " freq = %llu; /* Frequency, in Hz */\n"
2657 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2660 trace_clock_description(),
2661 (unsigned long long) trace_clock_freq(),
2662 (long long) measure_clock_offset()
2667 ret
= lttng_metadata_printf(session
,
2668 "typealias integer {\n"
2669 " size = 27; align = 1; signed = false;\n"
2670 " map = clock.%s.value;\n"
2671 "} := uint27_clock_monotonic_t;\n"
2673 "typealias integer {\n"
2674 " size = 32; align = %u; signed = false;\n"
2675 " map = clock.%s.value;\n"
2676 "} := uint32_clock_monotonic_t;\n"
2678 "typealias integer {\n"
2679 " size = 64; align = %u; signed = false;\n"
2680 " map = clock.%s.value;\n"
2681 "} := uint64_clock_monotonic_t;\n\n",
2683 lttng_alignof(uint32_t) * CHAR_BIT
,
2685 lttng_alignof(uint64_t) * CHAR_BIT
,
2691 ret
= _lttng_stream_packet_context_declare(session
);
2695 ret
= _lttng_event_header_declare(session
);
2700 list_for_each_entry(chan
, &session
->chan
, list
) {
2701 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2706 list_for_each_entry(event
, &session
->events
, list
) {
2707 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2711 session
->metadata_dumped
= 1;
2717 * lttng_transport_register - LTT transport registration
2718 * @transport: transport structure
2720 * Registers a transport which can be used as output to extract the data out of
2721 * LTTng. The module calling this registration function must ensure that no
2722 * trap-inducing code will be executed by the transport functions. E.g.
2723 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2724 * is made visible to the transport function. This registration acts as a
2725 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2726 * after its registration must it synchronize the TLBs.
2728 void lttng_transport_register(struct lttng_transport
*transport
)
2731 * Make sure no page fault can be triggered by the module about to be
2732 * registered. We deal with this here so we don't have to call
2733 * vmalloc_sync_all() in each module's init.
2735 wrapper_vmalloc_sync_all();
2737 mutex_lock(&sessions_mutex
);
2738 list_add_tail(&transport
->node
, <tng_transport_list
);
2739 mutex_unlock(&sessions_mutex
);
2741 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2744 * lttng_transport_unregister - LTT transport unregistration
2745 * @transport: transport structure
2747 void lttng_transport_unregister(struct lttng_transport
*transport
)
2749 mutex_lock(&sessions_mutex
);
2750 list_del(&transport
->node
);
2751 mutex_unlock(&sessions_mutex
);
2753 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2755 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2757 enum cpuhp_state lttng_hp_prepare
;
2758 enum cpuhp_state lttng_hp_online
;
2760 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2762 struct lttng_cpuhp_node
*lttng_node
;
2764 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2765 switch (lttng_node
->component
) {
2766 case LTTNG_RING_BUFFER_FRONTEND
:
2768 case LTTNG_RING_BUFFER_BACKEND
:
2769 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2770 case LTTNG_RING_BUFFER_ITER
:
2772 case LTTNG_CONTEXT_PERF_COUNTERS
:
2779 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2781 struct lttng_cpuhp_node
*lttng_node
;
2783 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2784 switch (lttng_node
->component
) {
2785 case LTTNG_RING_BUFFER_FRONTEND
:
2786 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2787 case LTTNG_RING_BUFFER_BACKEND
:
2789 case LTTNG_RING_BUFFER_ITER
:
2791 case LTTNG_CONTEXT_PERF_COUNTERS
:
2792 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2798 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2800 struct lttng_cpuhp_node
*lttng_node
;
2802 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2803 switch (lttng_node
->component
) {
2804 case LTTNG_RING_BUFFER_FRONTEND
:
2805 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2806 case LTTNG_RING_BUFFER_BACKEND
:
2808 case LTTNG_RING_BUFFER_ITER
:
2809 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2810 case LTTNG_CONTEXT_PERF_COUNTERS
:
2811 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2817 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2819 struct lttng_cpuhp_node
*lttng_node
;
2821 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2822 switch (lttng_node
->component
) {
2823 case LTTNG_RING_BUFFER_FRONTEND
:
2824 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2825 case LTTNG_RING_BUFFER_BACKEND
:
2827 case LTTNG_RING_BUFFER_ITER
:
2829 case LTTNG_CONTEXT_PERF_COUNTERS
:
2836 static int __init
lttng_init_cpu_hotplug(void)
2840 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2841 lttng_hotplug_prepare
,
2842 lttng_hotplug_dead
);
2846 lttng_hp_prepare
= ret
;
2847 lttng_rb_set_hp_prepare(ret
);
2849 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2850 lttng_hotplug_online
,
2851 lttng_hotplug_offline
);
2853 cpuhp_remove_multi_state(lttng_hp_prepare
);
2854 lttng_hp_prepare
= 0;
2857 lttng_hp_online
= ret
;
2858 lttng_rb_set_hp_online(ret
);
2863 static void __exit
lttng_exit_cpu_hotplug(void)
2865 lttng_rb_set_hp_online(0);
2866 cpuhp_remove_multi_state(lttng_hp_online
);
2867 lttng_rb_set_hp_prepare(0);
2868 cpuhp_remove_multi_state(lttng_hp_prepare
);
2871 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2872 static int lttng_init_cpu_hotplug(void)
2876 static void lttng_exit_cpu_hotplug(void)
2879 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2882 static int __init
lttng_events_init(void)
2886 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2889 ret
= wrapper_get_pfnblock_flags_mask_init();
2892 ret
= wrapper_get_pageblock_flags_mask_init();
2895 ret
= lttng_probes_init();
2898 ret
= lttng_context_init();
2901 ret
= lttng_tracepoint_init();
2904 event_cache
= KMEM_CACHE(lttng_event
, 0);
2909 ret
= lttng_abi_init();
2912 ret
= lttng_logger_init();
2915 ret
= lttng_init_cpu_hotplug();
2918 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2919 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2920 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2921 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2922 LTTNG_MODULES_EXTRAVERSION
,
2924 #ifdef LTTNG_EXTRA_VERSION_GIT
2925 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2929 #ifdef LTTNG_EXTRA_VERSION_NAME
2930 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2937 lttng_logger_exit();
2941 kmem_cache_destroy(event_cache
);
2943 lttng_tracepoint_exit();
2945 lttng_context_exit();
2946 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2947 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2948 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2949 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2950 LTTNG_MODULES_EXTRAVERSION
,
2952 #ifdef LTTNG_EXTRA_VERSION_GIT
2953 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2957 #ifdef LTTNG_EXTRA_VERSION_NAME
2958 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2965 module_init(lttng_events_init
);
2967 static void __exit
lttng_events_exit(void)
2969 struct lttng_session
*session
, *tmpsession
;
2971 lttng_exit_cpu_hotplug();
2972 lttng_logger_exit();
2974 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2975 lttng_session_destroy(session
);
2976 kmem_cache_destroy(event_cache
);
2977 lttng_tracepoint_exit();
2978 lttng_context_exit();
2979 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2980 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2981 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2982 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2983 LTTNG_MODULES_EXTRAVERSION
,
2985 #ifdef LTTNG_EXTRA_VERSION_GIT
2986 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2990 #ifdef LTTNG_EXTRA_VERSION_NAME
2991 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2997 module_exit(lttng_events_exit
);
2999 #include "extra_version/patches.i"
3000 #ifdef LTTNG_EXTRA_VERSION_GIT
3001 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
3003 #ifdef LTTNG_EXTRA_VERSION_NAME
3004 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
3006 MODULE_LICENSE("GPL and additional rights");
3007 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3008 MODULE_DESCRIPTION("LTTng tracer");
3009 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
3010 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
3011 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
3012 LTTNG_MODULES_EXTRAVERSION
);