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>
30 #include <linux/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/ringbuffer/backend.h>
44 #include <wrapper/ringbuffer/frontend.h>
46 #define METADATA_CACHE_DEFAULT_SIZE 4096
48 static LIST_HEAD(sessions
);
49 static LIST_HEAD(lttng_transport_list
);
51 * Protect the sessions and metadata caches.
53 static DEFINE_MUTEX(sessions_mutex
);
54 static struct kmem_cache
*event_cache
;
56 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
57 static void lttng_session_sync_enablers(struct lttng_session
*session
);
58 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
60 static void _lttng_event_destroy(struct lttng_event
*event
);
61 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
62 static int _lttng_event_unregister(struct lttng_event
*event
);
64 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
65 struct lttng_channel
*chan
,
66 struct lttng_event
*event
);
68 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
70 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
72 int _lttng_field_statedump(struct lttng_session
*session
,
73 const struct lttng_event_field
*field
,
76 void synchronize_trace(void)
79 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
80 #ifdef CONFIG_PREEMPT_RT_FULL
83 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
84 #ifdef CONFIG_PREEMPT_RT
87 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
90 void lttng_lock_sessions(void)
92 mutex_lock(&sessions_mutex
);
95 void lttng_unlock_sessions(void)
97 mutex_unlock(&sessions_mutex
);
101 * Called with sessions lock held.
103 int lttng_session_active(void)
105 struct lttng_session
*iter
;
107 list_for_each_entry(iter
, &sessions
, list
) {
114 struct lttng_session
*lttng_session_create(void)
116 struct lttng_session
*session
;
117 struct lttng_metadata_cache
*metadata_cache
;
120 mutex_lock(&sessions_mutex
);
121 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
124 INIT_LIST_HEAD(&session
->chan
);
125 INIT_LIST_HEAD(&session
->events
);
126 uuid_le_gen(&session
->uuid
);
128 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
131 goto err_free_session
;
132 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
133 if (!metadata_cache
->data
)
135 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
136 kref_init(&metadata_cache
->refcount
);
137 mutex_init(&metadata_cache
->lock
);
138 session
->metadata_cache
= metadata_cache
;
139 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
140 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
141 sizeof(metadata_cache
->uuid
));
142 INIT_LIST_HEAD(&session
->enablers_head
);
143 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
144 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
145 list_add(&session
->list
, &sessions
);
146 mutex_unlock(&sessions_mutex
);
150 kfree(metadata_cache
);
152 lttng_kvfree(session
);
154 mutex_unlock(&sessions_mutex
);
158 void metadata_cache_destroy(struct kref
*kref
)
160 struct lttng_metadata_cache
*cache
=
161 container_of(kref
, struct lttng_metadata_cache
, refcount
);
166 void lttng_session_destroy(struct lttng_session
*session
)
168 struct lttng_channel
*chan
, *tmpchan
;
169 struct lttng_event
*event
, *tmpevent
;
170 struct lttng_metadata_stream
*metadata_stream
;
171 struct lttng_enabler
*enabler
, *tmpenabler
;
174 mutex_lock(&sessions_mutex
);
175 WRITE_ONCE(session
->active
, 0);
176 list_for_each_entry(chan
, &session
->chan
, list
) {
177 ret
= lttng_syscalls_unregister(chan
);
180 list_for_each_entry(event
, &session
->events
, list
) {
181 ret
= _lttng_event_unregister(event
);
184 synchronize_trace(); /* Wait for in-flight events to complete */
185 list_for_each_entry_safe(enabler
, tmpenabler
,
186 &session
->enablers_head
, node
)
187 lttng_enabler_destroy(enabler
);
188 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
189 _lttng_event_destroy(event
);
190 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
191 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
192 _lttng_channel_destroy(chan
);
194 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
195 _lttng_metadata_channel_hangup(metadata_stream
);
196 if (session
->pid_tracker
)
197 lttng_pid_tracker_destroy(session
->pid_tracker
);
198 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
199 list_del(&session
->list
);
200 mutex_unlock(&sessions_mutex
);
201 lttng_kvfree(session
);
204 int lttng_session_statedump(struct lttng_session
*session
)
208 mutex_lock(&sessions_mutex
);
209 ret
= lttng_statedump_start(session
);
210 mutex_unlock(&sessions_mutex
);
214 int lttng_session_enable(struct lttng_session
*session
)
217 struct lttng_channel
*chan
;
219 mutex_lock(&sessions_mutex
);
220 if (session
->active
) {
225 /* Set transient enabler state to "enabled" */
228 /* We need to sync enablers with session before activation. */
229 lttng_session_sync_enablers(session
);
232 * Snapshot the number of events per channel to know the type of header
235 list_for_each_entry(chan
, &session
->chan
, list
) {
236 if (chan
->header_type
)
237 continue; /* don't change it if session stop/restart */
238 if (chan
->free_event_id
< 31)
239 chan
->header_type
= 1; /* compact */
241 chan
->header_type
= 2; /* large */
244 /* Clear each stream's quiescent state. */
245 list_for_each_entry(chan
, &session
->chan
, list
) {
246 if (chan
->channel_type
!= METADATA_CHANNEL
)
247 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
250 WRITE_ONCE(session
->active
, 1);
251 WRITE_ONCE(session
->been_active
, 1);
252 ret
= _lttng_session_metadata_statedump(session
);
254 WRITE_ONCE(session
->active
, 0);
257 ret
= lttng_statedump_start(session
);
259 WRITE_ONCE(session
->active
, 0);
261 mutex_unlock(&sessions_mutex
);
265 int lttng_session_disable(struct lttng_session
*session
)
268 struct lttng_channel
*chan
;
270 mutex_lock(&sessions_mutex
);
271 if (!session
->active
) {
275 WRITE_ONCE(session
->active
, 0);
277 /* Set transient enabler state to "disabled" */
279 lttng_session_sync_enablers(session
);
281 /* Set each stream's quiescent state. */
282 list_for_each_entry(chan
, &session
->chan
, list
) {
283 if (chan
->channel_type
!= METADATA_CHANNEL
)
284 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
287 mutex_unlock(&sessions_mutex
);
291 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
294 struct lttng_channel
*chan
;
295 struct lttng_event
*event
;
296 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
297 struct lttng_metadata_stream
*stream
;
299 mutex_lock(&sessions_mutex
);
300 if (!session
->active
) {
305 mutex_lock(&cache
->lock
);
306 memset(cache
->data
, 0, cache
->cache_alloc
);
307 cache
->metadata_written
= 0;
309 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
310 stream
->metadata_out
= 0;
311 stream
->metadata_in
= 0;
313 mutex_unlock(&cache
->lock
);
315 session
->metadata_dumped
= 0;
316 list_for_each_entry(chan
, &session
->chan
, list
) {
317 chan
->metadata_dumped
= 0;
320 list_for_each_entry(event
, &session
->events
, list
) {
321 event
->metadata_dumped
= 0;
324 ret
= _lttng_session_metadata_statedump(session
);
327 mutex_unlock(&sessions_mutex
);
331 int lttng_channel_enable(struct lttng_channel
*channel
)
335 mutex_lock(&sessions_mutex
);
336 if (channel
->channel_type
== METADATA_CHANNEL
) {
340 if (channel
->enabled
) {
344 /* Set transient enabler state to "enabled" */
346 lttng_session_sync_enablers(channel
->session
);
347 /* Set atomically the state to "enabled" */
348 WRITE_ONCE(channel
->enabled
, 1);
350 mutex_unlock(&sessions_mutex
);
354 int lttng_channel_disable(struct lttng_channel
*channel
)
358 mutex_lock(&sessions_mutex
);
359 if (channel
->channel_type
== METADATA_CHANNEL
) {
363 if (!channel
->enabled
) {
367 /* Set atomically the state to "disabled" */
368 WRITE_ONCE(channel
->enabled
, 0);
369 /* Set transient enabler state to "enabled" */
371 lttng_session_sync_enablers(channel
->session
);
373 mutex_unlock(&sessions_mutex
);
377 int lttng_event_enable(struct lttng_event
*event
)
381 mutex_lock(&sessions_mutex
);
382 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
386 if (event
->enabled
) {
390 switch (event
->instrumentation
) {
391 case LTTNG_KERNEL_TRACEPOINT
:
392 case LTTNG_KERNEL_SYSCALL
:
395 case LTTNG_KERNEL_KPROBE
:
396 case LTTNG_KERNEL_FUNCTION
:
397 case LTTNG_KERNEL_UPROBE
:
398 case LTTNG_KERNEL_NOOP
:
399 WRITE_ONCE(event
->enabled
, 1);
401 case LTTNG_KERNEL_KRETPROBE
:
402 ret
= lttng_kretprobes_event_enable_state(event
, 1);
409 mutex_unlock(&sessions_mutex
);
413 int lttng_event_disable(struct lttng_event
*event
)
417 mutex_lock(&sessions_mutex
);
418 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
422 if (!event
->enabled
) {
426 switch (event
->instrumentation
) {
427 case LTTNG_KERNEL_TRACEPOINT
:
428 case LTTNG_KERNEL_SYSCALL
:
431 case LTTNG_KERNEL_KPROBE
:
432 case LTTNG_KERNEL_FUNCTION
:
433 case LTTNG_KERNEL_UPROBE
:
434 case LTTNG_KERNEL_NOOP
:
435 WRITE_ONCE(event
->enabled
, 0);
437 case LTTNG_KERNEL_KRETPROBE
:
438 ret
= lttng_kretprobes_event_enable_state(event
, 0);
445 mutex_unlock(&sessions_mutex
);
449 static struct lttng_transport
*lttng_transport_find(const char *name
)
451 struct lttng_transport
*transport
;
453 list_for_each_entry(transport
, <tng_transport_list
, node
) {
454 if (!strcmp(transport
->name
, name
))
460 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
461 const char *transport_name
,
463 size_t subbuf_size
, size_t num_subbuf
,
464 unsigned int switch_timer_interval
,
465 unsigned int read_timer_interval
,
466 enum channel_type channel_type
)
468 struct lttng_channel
*chan
;
469 struct lttng_transport
*transport
= NULL
;
471 mutex_lock(&sessions_mutex
);
472 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
473 goto active
; /* Refuse to add channel to active session */
474 transport
= lttng_transport_find(transport_name
);
476 printk(KERN_WARNING
"LTTng transport %s not found\n",
480 if (!try_module_get(transport
->owner
)) {
481 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
484 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
487 chan
->session
= session
;
488 chan
->id
= session
->free_chan_id
++;
489 chan
->ops
= &transport
->ops
;
491 * Note: the channel creation op already writes into the packet
492 * headers. Therefore the "chan" information used as input
493 * should be already accessible.
495 chan
->chan
= transport
->ops
.channel_create(transport_name
,
496 chan
, buf_addr
, subbuf_size
, num_subbuf
,
497 switch_timer_interval
, read_timer_interval
);
502 chan
->transport
= transport
;
503 chan
->channel_type
= channel_type
;
504 list_add(&chan
->list
, &session
->chan
);
505 mutex_unlock(&sessions_mutex
);
512 module_put(transport
->owner
);
515 mutex_unlock(&sessions_mutex
);
520 * Only used internally at session destruction for per-cpu channels, and
521 * when metadata channel is released.
522 * Needs to be called with sessions mutex held.
525 void _lttng_channel_destroy(struct lttng_channel
*chan
)
527 chan
->ops
->channel_destroy(chan
->chan
);
528 module_put(chan
->transport
->owner
);
529 list_del(&chan
->list
);
530 lttng_destroy_context(chan
->ctx
);
534 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
536 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
538 /* Protect the metadata cache with the sessions_mutex. */
539 mutex_lock(&sessions_mutex
);
540 _lttng_channel_destroy(chan
);
541 mutex_unlock(&sessions_mutex
);
543 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
546 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
548 stream
->finalized
= 1;
549 wake_up_interruptible(&stream
->read_wait
);
553 * Supports event creation while tracing session is active.
554 * Needs to be called with sessions mutex held.
556 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
557 struct lttng_kernel_event
*event_param
,
559 const struct lttng_event_desc
*event_desc
,
560 enum lttng_kernel_instrumentation itype
)
562 struct lttng_session
*session
= chan
->session
;
563 struct lttng_event
*event
;
564 const char *event_name
;
565 struct hlist_head
*head
;
570 if (chan
->free_event_id
== -1U) {
576 case LTTNG_KERNEL_TRACEPOINT
:
577 event_name
= event_desc
->name
;
579 case LTTNG_KERNEL_KPROBE
:
580 case LTTNG_KERNEL_UPROBE
:
581 case LTTNG_KERNEL_KRETPROBE
:
582 case LTTNG_KERNEL_FUNCTION
:
583 case LTTNG_KERNEL_NOOP
:
584 case LTTNG_KERNEL_SYSCALL
:
585 event_name
= event_param
->name
;
592 name_len
= strlen(event_name
);
593 hash
= jhash(event_name
, name_len
, 0);
594 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
595 lttng_hlist_for_each_entry(event
, head
, hlist
) {
596 WARN_ON_ONCE(!event
->desc
);
597 if (!strncmp(event
->desc
->name
, event_name
,
598 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
599 && chan
== event
->chan
) {
605 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
611 event
->filter
= filter
;
612 event
->id
= chan
->free_event_id
++;
613 event
->instrumentation
= itype
;
614 event
->evtype
= LTTNG_TYPE_EVENT
;
615 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
616 INIT_LIST_HEAD(&event
->enablers_ref_head
);
619 case LTTNG_KERNEL_TRACEPOINT
:
620 /* Event will be enabled by enabler sync. */
622 event
->registered
= 0;
623 event
->desc
= lttng_event_get(event_name
);
628 /* Populate lttng_event structure before event registration. */
631 case LTTNG_KERNEL_KPROBE
:
633 * Needs to be explicitly enabled after creation, since
634 * we may want to apply filters.
637 event
->registered
= 1;
639 * Populate lttng_event structure before event
643 ret
= lttng_kprobes_register(event_name
,
644 event_param
->u
.kprobe
.symbol_name
,
645 event_param
->u
.kprobe
.offset
,
646 event_param
->u
.kprobe
.addr
,
652 ret
= try_module_get(event
->desc
->owner
);
655 case LTTNG_KERNEL_KRETPROBE
:
657 struct lttng_event
*event_return
;
659 /* kretprobe defines 2 events */
661 * Needs to be explicitly enabled after creation, since
662 * we may want to apply filters.
665 event
->registered
= 1;
667 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
672 event_return
->chan
= chan
;
673 event_return
->filter
= filter
;
674 event_return
->id
= chan
->free_event_id
++;
675 event_return
->enabled
= 0;
676 event_return
->registered
= 1;
677 event_return
->instrumentation
= itype
;
679 * Populate lttng_event structure before kretprobe registration.
682 ret
= lttng_kretprobes_register(event_name
,
683 event_param
->u
.kretprobe
.symbol_name
,
684 event_param
->u
.kretprobe
.offset
,
685 event_param
->u
.kretprobe
.addr
,
686 event
, event_return
);
688 kmem_cache_free(event_cache
, event_return
);
692 /* Take 2 refs on the module: one per event. */
693 ret
= try_module_get(event
->desc
->owner
);
695 ret
= try_module_get(event
->desc
->owner
);
697 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
699 WARN_ON_ONCE(ret
> 0);
701 kmem_cache_free(event_cache
, event_return
);
702 module_put(event
->desc
->owner
);
703 module_put(event
->desc
->owner
);
704 goto statedump_error
;
706 list_add(&event_return
->list
, &chan
->session
->events
);
709 case LTTNG_KERNEL_FUNCTION
:
711 * Needs to be explicitly enabled after creation, since
712 * we may want to apply filters.
715 event
->registered
= 1;
717 * Populate lttng_event structure before event
721 ret
= lttng_ftrace_register(event_name
,
722 event_param
->u
.ftrace
.symbol_name
,
727 ret
= try_module_get(event
->desc
->owner
);
730 case LTTNG_KERNEL_NOOP
:
731 case LTTNG_KERNEL_SYSCALL
:
733 * Needs to be explicitly enabled after creation, since
734 * we may want to apply filters.
737 event
->registered
= 0;
738 event
->desc
= event_desc
;
744 case LTTNG_KERNEL_UPROBE
:
746 * Needs to be explicitly enabled after creation, since
747 * we may want to apply filters.
750 event
->registered
= 1;
753 * Populate lttng_event structure before event
758 ret
= lttng_uprobes_register(event_param
->name
,
759 event_param
->u
.uprobe
.fd
,
763 ret
= try_module_get(event
->desc
->owner
);
771 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
772 WARN_ON_ONCE(ret
> 0);
774 goto statedump_error
;
776 hlist_add_head(&event
->hlist
, head
);
777 list_add(&event
->list
, &chan
->session
->events
);
781 /* If a statedump error occurs, events will not be readable. */
783 kmem_cache_free(event_cache
, event
);
791 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
792 struct lttng_kernel_event
*event_param
,
794 const struct lttng_event_desc
*event_desc
,
795 enum lttng_kernel_instrumentation itype
)
797 struct lttng_event
*event
;
799 mutex_lock(&sessions_mutex
);
800 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
802 mutex_unlock(&sessions_mutex
);
806 /* Only used for tracepoints for now. */
808 void register_event(struct lttng_event
*event
)
810 const struct lttng_event_desc
*desc
;
813 if (event
->registered
)
817 switch (event
->instrumentation
) {
818 case LTTNG_KERNEL_TRACEPOINT
:
819 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
820 desc
->probe_callback
,
823 case LTTNG_KERNEL_SYSCALL
:
824 ret
= lttng_syscall_filter_enable(event
->chan
,
827 case LTTNG_KERNEL_KPROBE
:
828 case LTTNG_KERNEL_UPROBE
:
829 case LTTNG_KERNEL_KRETPROBE
:
830 case LTTNG_KERNEL_FUNCTION
:
831 case LTTNG_KERNEL_NOOP
:
838 event
->registered
= 1;
842 * Only used internally at session destruction.
844 int _lttng_event_unregister(struct lttng_event
*event
)
846 const struct lttng_event_desc
*desc
;
849 if (!event
->registered
)
853 switch (event
->instrumentation
) {
854 case LTTNG_KERNEL_TRACEPOINT
:
855 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
856 event
->desc
->probe_callback
,
859 case LTTNG_KERNEL_KPROBE
:
860 lttng_kprobes_unregister(event
);
863 case LTTNG_KERNEL_KRETPROBE
:
864 lttng_kretprobes_unregister(event
);
867 case LTTNG_KERNEL_FUNCTION
:
868 lttng_ftrace_unregister(event
);
871 case LTTNG_KERNEL_SYSCALL
:
872 ret
= lttng_syscall_filter_disable(event
->chan
,
875 case LTTNG_KERNEL_NOOP
:
878 case LTTNG_KERNEL_UPROBE
:
879 lttng_uprobes_unregister(event
);
886 event
->registered
= 0;
891 * Only used internally at session destruction.
894 void _lttng_event_destroy(struct lttng_event
*event
)
896 switch (event
->instrumentation
) {
897 case LTTNG_KERNEL_TRACEPOINT
:
898 lttng_event_put(event
->desc
);
900 case LTTNG_KERNEL_KPROBE
:
901 module_put(event
->desc
->owner
);
902 lttng_kprobes_destroy_private(event
);
904 case LTTNG_KERNEL_KRETPROBE
:
905 module_put(event
->desc
->owner
);
906 lttng_kretprobes_destroy_private(event
);
908 case LTTNG_KERNEL_FUNCTION
:
909 module_put(event
->desc
->owner
);
910 lttng_ftrace_destroy_private(event
);
912 case LTTNG_KERNEL_NOOP
:
913 case LTTNG_KERNEL_SYSCALL
:
915 case LTTNG_KERNEL_UPROBE
:
916 module_put(event
->desc
->owner
);
917 lttng_uprobes_destroy_private(event
);
922 list_del(&event
->list
);
923 lttng_destroy_context(event
->ctx
);
924 kmem_cache_free(event_cache
, event
);
927 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
933 mutex_lock(&sessions_mutex
);
935 /* track all pids: destroy tracker. */
936 if (session
->pid_tracker
) {
937 struct lttng_pid_tracker
*lpf
;
939 lpf
= session
->pid_tracker
;
940 rcu_assign_pointer(session
->pid_tracker
, NULL
);
942 lttng_pid_tracker_destroy(lpf
);
946 if (!session
->pid_tracker
) {
947 struct lttng_pid_tracker
*lpf
;
949 lpf
= lttng_pid_tracker_create();
954 ret
= lttng_pid_tracker_add(lpf
, pid
);
955 rcu_assign_pointer(session
->pid_tracker
, lpf
);
957 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
961 mutex_unlock(&sessions_mutex
);
965 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
971 mutex_lock(&sessions_mutex
);
973 /* untrack all pids: replace by empty tracker. */
974 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
975 struct lttng_pid_tracker
*lpf
;
977 lpf
= lttng_pid_tracker_create();
982 rcu_assign_pointer(session
->pid_tracker
, lpf
);
985 lttng_pid_tracker_destroy(old_lpf
);
988 if (!session
->pid_tracker
) {
992 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
995 mutex_unlock(&sessions_mutex
);
1000 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
1002 struct lttng_session
*session
= m
->private;
1003 struct lttng_pid_tracker
*lpf
;
1004 struct lttng_pid_hash_node
*e
;
1007 mutex_lock(&sessions_mutex
);
1008 lpf
= session
->pid_tracker
;
1010 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1011 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1013 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1019 /* PID tracker disabled. */
1020 if (iter
>= *pos
&& iter
== 0) {
1021 return session
; /* empty tracker */
1029 /* Called with sessions_mutex held. */
1031 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1033 struct lttng_session
*session
= m
->private;
1034 struct lttng_pid_tracker
*lpf
;
1035 struct lttng_pid_hash_node
*e
;
1039 lpf
= session
->pid_tracker
;
1041 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1042 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1044 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1045 if (iter
++ >= *ppos
)
1050 /* PID tracker disabled. */
1051 if (iter
>= *ppos
&& iter
== 0)
1052 return session
; /* empty tracker */
1061 void pid_list_stop(struct seq_file
*m
, void *p
)
1063 mutex_unlock(&sessions_mutex
);
1067 int pid_list_show(struct seq_file
*m
, void *p
)
1071 if (p
== m
->private) {
1072 /* Tracker disabled. */
1075 const struct lttng_pid_hash_node
*e
= p
;
1077 pid
= lttng_pid_tracker_get_node_pid(e
);
1079 seq_printf(m
, "process { pid = %d; };\n", pid
);
1084 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1085 .start
= pid_list_start
,
1086 .next
= pid_list_next
,
1087 .stop
= pid_list_stop
,
1088 .show
= pid_list_show
,
1092 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1094 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1098 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1100 struct seq_file
*m
= file
->private_data
;
1101 struct lttng_session
*session
= m
->private;
1104 WARN_ON_ONCE(!session
);
1105 ret
= seq_release(inode
, file
);
1106 if (!ret
&& session
)
1107 fput(session
->file
);
1111 const struct file_operations lttng_tracker_pids_list_fops
= {
1112 .owner
= THIS_MODULE
,
1113 .open
= lttng_tracker_pids_list_open
,
1115 .llseek
= seq_lseek
,
1116 .release
= lttng_tracker_pids_list_release
,
1119 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1121 struct file
*tracker_pids_list_file
;
1125 file_fd
= lttng_get_unused_fd();
1131 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1132 <tng_tracker_pids_list_fops
,
1134 if (IS_ERR(tracker_pids_list_file
)) {
1135 ret
= PTR_ERR(tracker_pids_list_file
);
1138 if (atomic_long_add_unless(&session
->file
->f_count
,
1139 1, INT_MAX
) == INT_MAX
) {
1140 goto refcount_error
;
1142 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1145 m
= tracker_pids_list_file
->private_data
;
1146 m
->private = session
;
1147 fd_install(file_fd
, tracker_pids_list_file
);
1152 atomic_long_dec(&session
->file
->f_count
);
1154 fput(tracker_pids_list_file
);
1156 put_unused_fd(file_fd
);
1162 * Enabler management.
1165 int lttng_match_enabler_star_glob(const char *desc_name
,
1166 const char *pattern
)
1168 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1169 desc_name
, LTTNG_SIZE_MAX
))
1175 int lttng_match_enabler_name(const char *desc_name
,
1178 if (strcmp(desc_name
, name
))
1184 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1185 struct lttng_enabler
*enabler
)
1187 const char *desc_name
, *enabler_name
;
1189 enabler_name
= enabler
->event_param
.name
;
1190 switch (enabler
->event_param
.instrumentation
) {
1191 case LTTNG_KERNEL_TRACEPOINT
:
1192 desc_name
= desc
->name
;
1194 case LTTNG_KERNEL_SYSCALL
:
1195 desc_name
= desc
->name
;
1196 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1197 desc_name
+= strlen("compat_");
1198 if (!strncmp(desc_name
, "syscall_exit_",
1199 strlen("syscall_exit_"))) {
1200 desc_name
+= strlen("syscall_exit_");
1201 } else if (!strncmp(desc_name
, "syscall_entry_",
1202 strlen("syscall_entry_"))) {
1203 desc_name
+= strlen("syscall_entry_");
1213 switch (enabler
->type
) {
1214 case LTTNG_ENABLER_STAR_GLOB
:
1215 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1216 case LTTNG_ENABLER_NAME
:
1217 return lttng_match_enabler_name(desc_name
, enabler_name
);
1224 int lttng_event_match_enabler(struct lttng_event
*event
,
1225 struct lttng_enabler
*enabler
)
1227 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1229 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1230 && event
->chan
== enabler
->chan
)
1237 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1238 struct lttng_enabler
*enabler
)
1240 struct lttng_enabler_ref
*enabler_ref
;
1242 list_for_each_entry(enabler_ref
,
1243 &event
->enablers_ref_head
, node
) {
1244 if (enabler_ref
->ref
== enabler
)
1251 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1253 struct lttng_session
*session
= enabler
->chan
->session
;
1254 struct lttng_probe_desc
*probe_desc
;
1255 const struct lttng_event_desc
*desc
;
1257 struct list_head
*probe_list
;
1259 probe_list
= lttng_get_probe_list_head();
1261 * For each probe event, if we find that a probe event matches
1262 * our enabler, create an associated lttng_event if not
1265 list_for_each_entry(probe_desc
, probe_list
, head
) {
1266 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1268 struct hlist_head
*head
;
1269 const char *event_name
;
1272 struct lttng_event
*event
;
1274 desc
= probe_desc
->event_desc
[i
];
1275 if (!lttng_desc_match_enabler(desc
, enabler
))
1277 event_name
= desc
->name
;
1278 name_len
= strlen(event_name
);
1281 * Check if already created.
1283 hash
= jhash(event_name
, name_len
, 0);
1284 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1285 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1286 if (event
->desc
== desc
1287 && event
->chan
== enabler
->chan
)
1294 * We need to create an event for this
1297 event
= _lttng_event_create(enabler
->chan
,
1299 LTTNG_KERNEL_TRACEPOINT
);
1301 printk(KERN_INFO
"Unable to create event %s\n",
1302 probe_desc
->event_desc
[i
]->name
);
1309 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1313 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1318 * Create struct lttng_event if it is missing and present in the list of
1319 * tracepoint probes.
1320 * Should be called with sessions mutex held.
1323 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1325 switch (enabler
->event_param
.instrumentation
) {
1326 case LTTNG_KERNEL_TRACEPOINT
:
1327 lttng_create_tracepoint_if_missing(enabler
);
1329 case LTTNG_KERNEL_SYSCALL
:
1330 lttng_create_syscall_if_missing(enabler
);
1339 * Create events associated with an enabler (if not already present),
1340 * and add backward reference from the event to the enabler.
1341 * Should be called with sessions mutex held.
1344 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1346 struct lttng_session
*session
= enabler
->chan
->session
;
1347 struct lttng_event
*event
;
1349 /* First ensure that probe events are created for this enabler. */
1350 lttng_create_event_if_missing(enabler
);
1352 /* For each event matching enabler in session event list. */
1353 list_for_each_entry(event
, &session
->events
, list
) {
1354 struct lttng_enabler_ref
*enabler_ref
;
1356 if (!lttng_event_match_enabler(event
, enabler
))
1358 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1361 * If no backward ref, create it.
1362 * Add backward ref from event to enabler.
1364 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1367 enabler_ref
->ref
= enabler
;
1368 list_add(&enabler_ref
->node
,
1369 &event
->enablers_ref_head
);
1373 * Link filter bytecodes if not linked yet.
1375 lttng_enabler_event_link_bytecode(event
, enabler
);
1377 /* TODO: merge event context. */
1383 * Called at module load: connect the probe on all enablers matching
1385 * Called with sessions lock held.
1387 int lttng_fix_pending_events(void)
1389 struct lttng_session
*session
;
1391 list_for_each_entry(session
, &sessions
, list
)
1392 lttng_session_lazy_sync_enablers(session
);
1396 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1397 struct lttng_kernel_event
*event_param
,
1398 struct lttng_channel
*chan
)
1400 struct lttng_enabler
*enabler
;
1402 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1405 enabler
->type
= type
;
1406 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1407 memcpy(&enabler
->event_param
, event_param
,
1408 sizeof(enabler
->event_param
));
1409 enabler
->chan
= chan
;
1411 enabler
->enabled
= 0;
1412 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1413 mutex_lock(&sessions_mutex
);
1414 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1415 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1416 mutex_unlock(&sessions_mutex
);
1420 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1422 mutex_lock(&sessions_mutex
);
1423 enabler
->enabled
= 1;
1424 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1425 mutex_unlock(&sessions_mutex
);
1429 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1431 mutex_lock(&sessions_mutex
);
1432 enabler
->enabled
= 0;
1433 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1434 mutex_unlock(&sessions_mutex
);
1438 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1439 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1441 struct lttng_filter_bytecode_node
*bytecode_node
;
1442 uint32_t bytecode_len
;
1445 ret
= get_user(bytecode_len
, &bytecode
->len
);
1448 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1452 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1453 sizeof(*bytecode
) + bytecode_len
);
1456 bytecode_node
->enabler
= enabler
;
1457 /* Enforce length based on allocated size */
1458 bytecode_node
->bc
.len
= bytecode_len
;
1459 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1460 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1464 kfree(bytecode_node
);
1468 int lttng_event_add_callsite(struct lttng_event
*event
,
1469 struct lttng_kernel_event_callsite __user
*callsite
)
1472 switch (event
->instrumentation
) {
1473 case LTTNG_KERNEL_UPROBE
:
1474 return lttng_uprobes_add_callsite(event
, callsite
);
1480 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1481 struct lttng_kernel_context
*context_param
)
1487 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1489 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1491 /* Destroy filter bytecode */
1492 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1493 &enabler
->filter_bytecode_head
, node
) {
1497 /* Destroy contexts */
1498 lttng_destroy_context(enabler
->ctx
);
1500 list_del(&enabler
->node
);
1505 * lttng_session_sync_enablers should be called just before starting a
1507 * Should be called with sessions mutex held.
1510 void lttng_session_sync_enablers(struct lttng_session
*session
)
1512 struct lttng_enabler
*enabler
;
1513 struct lttng_event
*event
;
1515 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1516 lttng_enabler_ref_events(enabler
);
1518 * For each event, if at least one of its enablers is enabled,
1519 * and its channel and session transient states are enabled, we
1520 * enable the event, else we disable it.
1522 list_for_each_entry(event
, &session
->events
, list
) {
1523 struct lttng_enabler_ref
*enabler_ref
;
1524 struct lttng_bytecode_runtime
*runtime
;
1525 int enabled
= 0, has_enablers_without_bytecode
= 0;
1527 switch (event
->instrumentation
) {
1528 case LTTNG_KERNEL_TRACEPOINT
:
1529 case LTTNG_KERNEL_SYSCALL
:
1531 list_for_each_entry(enabler_ref
,
1532 &event
->enablers_ref_head
, node
) {
1533 if (enabler_ref
->ref
->enabled
) {
1540 /* Not handled with lazy sync. */
1544 * Enabled state is based on union of enablers, with
1545 * intesection of session and channel transient enable
1548 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1550 WRITE_ONCE(event
->enabled
, enabled
);
1552 * Sync tracepoint registration with event enabled
1556 register_event(event
);
1558 _lttng_event_unregister(event
);
1561 /* Check if has enablers without bytecode enabled */
1562 list_for_each_entry(enabler_ref
,
1563 &event
->enablers_ref_head
, node
) {
1564 if (enabler_ref
->ref
->enabled
1565 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1566 has_enablers_without_bytecode
= 1;
1570 event
->has_enablers_without_bytecode
=
1571 has_enablers_without_bytecode
;
1573 /* Enable filters */
1574 list_for_each_entry(runtime
,
1575 &event
->bytecode_runtime_head
, node
)
1576 lttng_filter_sync_state(runtime
);
1581 * Apply enablers to session events, adding events to session if need
1582 * be. It is required after each modification applied to an active
1583 * session, and right before session "start".
1584 * "lazy" sync means we only sync if required.
1585 * Should be called with sessions mutex held.
1588 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1590 /* We can skip if session is not active */
1591 if (!session
->active
)
1593 lttng_session_sync_enablers(session
);
1597 * Serialize at most one packet worth of metadata into a metadata
1599 * We grab the metadata cache mutex to get exclusive access to our metadata
1600 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1601 * allows us to do racy operations such as looking for remaining space left in
1602 * packet and write, since mutual exclusion protects us from concurrent writes.
1603 * Mutual exclusion on the metadata cache allow us to read the cache content
1604 * without racing against reallocation of the cache by updates.
1605 * Returns the number of bytes written in the channel, 0 if no data
1606 * was written and a negative value on error.
1608 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1609 struct channel
*chan
)
1611 struct lib_ring_buffer_ctx ctx
;
1613 size_t len
, reserve_len
;
1616 * Ensure we support mutiple get_next / put sequences followed by
1617 * put_next. The metadata cache lock protects reading the metadata
1618 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1619 * "flush" operations on the buffer invoked by different processes.
1620 * Moreover, since the metadata cache memory can be reallocated, we
1621 * need to have exclusive access against updates even though we only
1624 mutex_lock(&stream
->metadata_cache
->lock
);
1625 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1626 if (stream
->metadata_in
!= stream
->metadata_out
)
1629 /* Metadata regenerated, change the version. */
1630 if (stream
->metadata_cache
->version
!= stream
->version
)
1631 stream
->version
= stream
->metadata_cache
->version
;
1633 len
= stream
->metadata_cache
->metadata_written
-
1634 stream
->metadata_in
;
1637 reserve_len
= min_t(size_t,
1638 stream
->transport
->ops
.packet_avail_size(chan
),
1640 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1643 * If reservation failed, return an error to the caller.
1645 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1647 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1650 stream
->transport
->ops
.event_write(&ctx
,
1651 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1653 stream
->transport
->ops
.event_commit(&ctx
);
1654 stream
->metadata_in
+= reserve_len
;
1658 mutex_unlock(&stream
->metadata_cache
->lock
);
1663 * Write the metadata to the metadata cache.
1664 * Must be called with sessions_mutex held.
1665 * The metadata cache lock protects us from concurrent read access from
1666 * thread outputting metadata content to ring buffer.
1668 int lttng_metadata_printf(struct lttng_session
*session
,
1669 const char *fmt
, ...)
1674 struct lttng_metadata_stream
*stream
;
1676 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1679 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1685 mutex_lock(&session
->metadata_cache
->lock
);
1686 if (session
->metadata_cache
->metadata_written
+ len
>
1687 session
->metadata_cache
->cache_alloc
) {
1688 char *tmp_cache_realloc
;
1689 unsigned int tmp_cache_alloc_size
;
1691 tmp_cache_alloc_size
= max_t(unsigned int,
1692 session
->metadata_cache
->cache_alloc
+ len
,
1693 session
->metadata_cache
->cache_alloc
<< 1);
1694 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
1695 if (!tmp_cache_realloc
)
1697 if (session
->metadata_cache
->data
) {
1698 memcpy(tmp_cache_realloc
,
1699 session
->metadata_cache
->data
,
1700 session
->metadata_cache
->cache_alloc
);
1701 vfree(session
->metadata_cache
->data
);
1704 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1705 session
->metadata_cache
->data
= tmp_cache_realloc
;
1707 memcpy(session
->metadata_cache
->data
+
1708 session
->metadata_cache
->metadata_written
,
1710 session
->metadata_cache
->metadata_written
+= len
;
1711 mutex_unlock(&session
->metadata_cache
->lock
);
1714 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1715 wake_up_interruptible(&stream
->read_wait
);
1720 mutex_unlock(&session
->metadata_cache
->lock
);
1726 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1730 for (i
= 0; i
< nesting
; i
++) {
1733 ret
= lttng_metadata_printf(session
, " ");
1742 * Must be called with sessions_mutex held.
1745 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1746 const struct lttng_type
*type
,
1750 uint32_t i
, nr_fields
;
1752 ret
= print_tabs(session
, nesting
);
1755 ret
= lttng_metadata_printf(session
,
1759 nr_fields
= type
->u
._struct
.nr_fields
;
1760 for (i
= 0; i
< nr_fields
; i
++) {
1761 const struct lttng_event_field
*iter_field
;
1763 iter_field
= &type
->u
._struct
.fields
[i
];
1764 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1768 ret
= print_tabs(session
, nesting
);
1771 ret
= lttng_metadata_printf(session
,
1777 * Must be called with sessions_mutex held.
1780 int _lttng_struct_statedump(struct lttng_session
*session
,
1781 const struct lttng_event_field
*field
,
1786 ret
= _lttng_struct_type_statedump(session
,
1787 &field
->type
, nesting
);
1790 ret
= lttng_metadata_printf(session
,
1797 * Must be called with sessions_mutex held.
1800 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1801 const struct lttng_type
*type
,
1805 uint32_t i
, nr_choices
;
1807 ret
= print_tabs(session
, nesting
);
1810 ret
= lttng_metadata_printf(session
,
1811 "variant <_%s> {\n",
1812 type
->u
.variant
.tag_name
);
1815 nr_choices
= type
->u
.variant
.nr_choices
;
1816 for (i
= 0; i
< nr_choices
; i
++) {
1817 const struct lttng_event_field
*iter_field
;
1819 iter_field
= &type
->u
.variant
.choices
[i
];
1820 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1824 ret
= print_tabs(session
, nesting
);
1827 ret
= lttng_metadata_printf(session
,
1833 * Must be called with sessions_mutex held.
1836 int _lttng_variant_statedump(struct lttng_session
*session
,
1837 const struct lttng_event_field
*field
,
1842 ret
= _lttng_variant_type_statedump(session
,
1843 &field
->type
, nesting
);
1846 ret
= lttng_metadata_printf(session
,
1853 * Must be called with sessions_mutex held.
1856 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1857 const struct lttng_event_field
*field
,
1861 const struct lttng_type
*elem_type
;
1863 /* Only array of structures and variants are currently supported. */
1864 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1865 switch (elem_type
->atype
) {
1867 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1872 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1879 ret
= lttng_metadata_printf(session
,
1882 field
->type
.u
.array_compound
.length
);
1887 * Must be called with sessions_mutex held.
1890 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1891 const struct lttng_event_field
*field
,
1895 const char *length_name
;
1896 const struct lttng_type
*elem_type
;
1898 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1900 /* Only array of structures and variants are currently supported. */
1901 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1902 switch (elem_type
->atype
) {
1904 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1909 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1916 ret
= lttng_metadata_printf(session
,
1924 * Must be called with sessions_mutex held.
1927 int _lttng_enum_statedump(struct lttng_session
*session
,
1928 const struct lttng_event_field
*field
,
1931 const struct lttng_enum_desc
*enum_desc
;
1932 const struct lttng_integer_type
*container_type
;
1934 unsigned int i
, nr_entries
;
1936 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1937 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1938 nr_entries
= enum_desc
->nr_entries
;
1940 ret
= print_tabs(session
, nesting
);
1943 ret
= lttng_metadata_printf(session
,
1944 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1945 container_type
->size
,
1946 container_type
->alignment
,
1947 container_type
->signedness
,
1948 (container_type
->encoding
== lttng_encode_none
)
1950 : (container_type
->encoding
== lttng_encode_UTF8
)
1953 container_type
->base
,
1954 #if __BYTE_ORDER == __BIG_ENDIAN
1955 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1957 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1962 /* Dump all entries */
1963 for (i
= 0; i
< nr_entries
; i
++) {
1964 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1967 ret
= print_tabs(session
, nesting
+ 1);
1970 ret
= lttng_metadata_printf(session
,
1974 len
= strlen(entry
->string
);
1975 /* Escape the character '"' */
1976 for (j
= 0; j
< len
; j
++) {
1977 char c
= entry
->string
[j
];
1981 ret
= lttng_metadata_printf(session
,
1985 ret
= lttng_metadata_printf(session
,
1989 ret
= lttng_metadata_printf(session
,
1996 ret
= lttng_metadata_printf(session
, "\"");
2000 if (entry
->options
.is_auto
) {
2001 ret
= lttng_metadata_printf(session
, ",\n");
2005 ret
= lttng_metadata_printf(session
,
2009 if (entry
->start
.signedness
)
2010 ret
= lttng_metadata_printf(session
,
2011 "%lld", (long long) entry
->start
.value
);
2013 ret
= lttng_metadata_printf(session
,
2014 "%llu", entry
->start
.value
);
2017 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2019 == entry
->end
.value
) {
2020 ret
= lttng_metadata_printf(session
,
2023 if (entry
->end
.signedness
) {
2024 ret
= lttng_metadata_printf(session
,
2026 (long long) entry
->end
.value
);
2028 ret
= lttng_metadata_printf(session
,
2037 ret
= print_tabs(session
, nesting
);
2040 ret
= lttng_metadata_printf(session
, "} _%s;\n",
2047 * Must be called with sessions_mutex held.
2050 int _lttng_field_statedump(struct lttng_session
*session
,
2051 const struct lttng_event_field
*field
,
2056 switch (field
->type
.atype
) {
2058 ret
= print_tabs(session
, nesting
);
2061 ret
= lttng_metadata_printf(session
,
2062 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2063 field
->type
.u
.basic
.integer
.size
,
2064 field
->type
.u
.basic
.integer
.alignment
,
2065 field
->type
.u
.basic
.integer
.signedness
,
2066 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2068 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2071 field
->type
.u
.basic
.integer
.base
,
2072 #if __BYTE_ORDER == __BIG_ENDIAN
2073 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2075 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2080 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2083 case atype_array_bitfield
:
2085 const struct lttng_basic_type
*elem_type
;
2087 elem_type
= &field
->type
.u
.array
.elem_type
;
2088 if (field
->type
.u
.array
.elem_alignment
) {
2089 ret
= print_tabs(session
, nesting
);
2092 ret
= lttng_metadata_printf(session
,
2093 "struct { } align(%u) _%s_padding;\n",
2094 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2099 ret
= print_tabs(session
, nesting
);
2102 ret
= lttng_metadata_printf(session
,
2103 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2104 elem_type
->u
.basic
.integer
.size
,
2105 elem_type
->u
.basic
.integer
.alignment
,
2106 elem_type
->u
.basic
.integer
.signedness
,
2107 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2109 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2112 elem_type
->u
.basic
.integer
.base
,
2113 #if __BYTE_ORDER == __BIG_ENDIAN
2114 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2116 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2118 field
->name
, field
->type
.u
.array
.length
);
2121 case atype_sequence
:
2122 case atype_sequence_bitfield
:
2124 const struct lttng_basic_type
*elem_type
;
2125 const struct lttng_basic_type
*length_type
;
2127 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2128 length_type
= &field
->type
.u
.sequence
.length_type
;
2129 ret
= print_tabs(session
, nesting
);
2132 ret
= lttng_metadata_printf(session
,
2133 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2134 length_type
->u
.basic
.integer
.size
,
2135 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2136 length_type
->u
.basic
.integer
.signedness
,
2137 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2139 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2142 length_type
->u
.basic
.integer
.base
,
2143 #if __BYTE_ORDER == __BIG_ENDIAN
2144 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2146 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2152 if (field
->type
.u
.sequence
.elem_alignment
) {
2153 ret
= print_tabs(session
, nesting
);
2156 ret
= lttng_metadata_printf(session
,
2157 "struct { } align(%u) _%s_padding;\n",
2158 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2163 ret
= print_tabs(session
, nesting
);
2166 ret
= lttng_metadata_printf(session
,
2167 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2168 elem_type
->u
.basic
.integer
.size
,
2169 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2170 elem_type
->u
.basic
.integer
.signedness
,
2171 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2173 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2176 elem_type
->u
.basic
.integer
.base
,
2177 #if __BYTE_ORDER == __BIG_ENDIAN
2178 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2180 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2188 /* Default encoding is UTF8 */
2189 ret
= print_tabs(session
, nesting
);
2192 ret
= lttng_metadata_printf(session
,
2194 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2195 " { encoding = ASCII; }" : "",
2199 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2201 case atype_array_compound
:
2202 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2204 case atype_sequence_compound
:
2205 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2208 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2219 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2220 struct lttng_ctx
*ctx
)
2227 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2228 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2230 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2238 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2239 struct lttng_event
*event
)
2241 const struct lttng_event_desc
*desc
= event
->desc
;
2245 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2246 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2248 ret
= _lttng_field_statedump(session
, field
, 2);
2256 * Must be called with sessions_mutex held.
2259 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2260 struct lttng_channel
*chan
,
2261 struct lttng_event
*event
)
2265 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2267 if (chan
->channel_type
== METADATA_CHANNEL
)
2270 ret
= lttng_metadata_printf(session
,
2274 " stream_id = %u;\n",
2282 ret
= lttng_metadata_printf(session
,
2283 " context := struct {\n");
2287 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2291 ret
= lttng_metadata_printf(session
,
2297 ret
= lttng_metadata_printf(session
,
2298 " fields := struct {\n"
2303 ret
= _lttng_fields_metadata_statedump(session
, event
);
2308 * LTTng space reservation can only reserve multiples of the
2311 ret
= lttng_metadata_printf(session
,
2317 event
->metadata_dumped
= 1;
2324 * Must be called with sessions_mutex held.
2327 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2328 struct lttng_channel
*chan
)
2332 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2335 if (chan
->channel_type
== METADATA_CHANNEL
)
2338 WARN_ON_ONCE(!chan
->header_type
);
2339 ret
= lttng_metadata_printf(session
,
2342 " event.header := %s;\n"
2343 " packet.context := struct packet_context;\n",
2345 chan
->header_type
== 1 ? "struct event_header_compact" :
2346 "struct event_header_large");
2351 ret
= lttng_metadata_printf(session
,
2352 " event.context := struct {\n");
2356 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2360 ret
= lttng_metadata_printf(session
,
2366 ret
= lttng_metadata_printf(session
,
2369 chan
->metadata_dumped
= 1;
2375 * Must be called with sessions_mutex held.
2378 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2380 return lttng_metadata_printf(session
,
2381 "struct packet_context {\n"
2382 " uint64_clock_monotonic_t timestamp_begin;\n"
2383 " uint64_clock_monotonic_t timestamp_end;\n"
2384 " uint64_t content_size;\n"
2385 " uint64_t packet_size;\n"
2386 " uint64_t packet_seq_num;\n"
2387 " unsigned long events_discarded;\n"
2388 " uint32_t cpu_id;\n"
2395 * id: range: 0 - 30.
2396 * id 31 is reserved to indicate an extended header.
2399 * id: range: 0 - 65534.
2400 * id 65535 is reserved to indicate an extended header.
2402 * Must be called with sessions_mutex held.
2405 int _lttng_event_header_declare(struct lttng_session
*session
)
2407 return lttng_metadata_printf(session
,
2408 "struct event_header_compact {\n"
2409 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2412 " uint27_clock_monotonic_t timestamp;\n"
2416 " uint64_clock_monotonic_t timestamp;\n"
2421 "struct event_header_large {\n"
2422 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2425 " uint32_clock_monotonic_t timestamp;\n"
2429 " uint64_clock_monotonic_t timestamp;\n"
2433 lttng_alignof(uint32_t) * CHAR_BIT
,
2434 lttng_alignof(uint16_t) * CHAR_BIT
2439 * Approximation of NTP time of day to clock monotonic correlation,
2440 * taken at start of trace.
2441 * Yes, this is only an approximation. Yes, we can (and will) do better
2442 * in future versions.
2443 * This function may return a negative offset. It may happen if the
2444 * system sets the REALTIME clock to 0 after boot.
2447 int64_t measure_clock_offset(void)
2449 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2450 uint64_t tcf
= trace_clock_freq();
2452 struct timespec rts
= { 0, 0 };
2453 unsigned long flags
;
2455 /* Disable interrupts to increase correlation precision. */
2456 local_irq_save(flags
);
2457 monotonic
[0] = trace_clock_read64();
2458 getnstimeofday(&rts
);
2459 monotonic
[1] = trace_clock_read64();
2460 local_irq_restore(flags
);
2462 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2463 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2464 if (tcf
== NSEC_PER_SEC
) {
2465 realtime
+= rts
.tv_nsec
;
2467 uint64_t n
= rts
.tv_nsec
* tcf
;
2469 do_div(n
, NSEC_PER_SEC
);
2472 offset
= (int64_t) realtime
- monotonic_avg
;
2477 * Output metadata into this session's metadata buffers.
2478 * Must be called with sessions_mutex held.
2481 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2483 unsigned char *uuid_c
= session
->uuid
.b
;
2484 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2485 struct lttng_channel
*chan
;
2486 struct lttng_event
*event
;
2489 if (!READ_ONCE(session
->active
))
2491 if (session
->metadata_dumped
)
2494 snprintf(uuid_s
, sizeof(uuid_s
),
2495 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2496 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2497 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2498 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2499 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2501 ret
= lttng_metadata_printf(session
,
2502 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2503 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2504 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2505 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2506 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2507 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2508 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2514 " byte_order = %s;\n"
2515 " packet.header := struct {\n"
2516 " uint32_t magic;\n"
2517 " uint8_t uuid[16];\n"
2518 " uint32_t stream_id;\n"
2519 " uint64_t stream_instance_id;\n"
2522 lttng_alignof(uint8_t) * CHAR_BIT
,
2523 lttng_alignof(uint16_t) * CHAR_BIT
,
2524 lttng_alignof(uint32_t) * CHAR_BIT
,
2525 lttng_alignof(uint64_t) * CHAR_BIT
,
2526 sizeof(unsigned long) * CHAR_BIT
,
2527 lttng_alignof(unsigned long) * CHAR_BIT
,
2531 #if __BYTE_ORDER == __BIG_ENDIAN
2540 ret
= lttng_metadata_printf(session
,
2542 " hostname = \"%s\";\n"
2543 " domain = \"kernel\";\n"
2544 " sysname = \"%s\";\n"
2545 " kernel_release = \"%s\";\n"
2546 " kernel_version = \"%s\";\n"
2547 " tracer_name = \"lttng-modules\";\n"
2548 " tracer_major = %d;\n"
2549 " tracer_minor = %d;\n"
2550 " tracer_patchlevel = %d;\n"
2552 current
->nsproxy
->uts_ns
->name
.nodename
,
2556 LTTNG_MODULES_MAJOR_VERSION
,
2557 LTTNG_MODULES_MINOR_VERSION
,
2558 LTTNG_MODULES_PATCHLEVEL_VERSION
2563 ret
= lttng_metadata_printf(session
,
2565 " name = \"%s\";\n",
2571 if (!trace_clock_uuid(clock_uuid_s
)) {
2572 ret
= lttng_metadata_printf(session
,
2573 " uuid = \"%s\";\n",
2580 ret
= lttng_metadata_printf(session
,
2581 " description = \"%s\";\n"
2582 " freq = %llu; /* Frequency, in Hz */\n"
2583 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2586 trace_clock_description(),
2587 (unsigned long long) trace_clock_freq(),
2588 (long long) measure_clock_offset()
2593 ret
= lttng_metadata_printf(session
,
2594 "typealias integer {\n"
2595 " size = 27; align = 1; signed = false;\n"
2596 " map = clock.%s.value;\n"
2597 "} := uint27_clock_monotonic_t;\n"
2599 "typealias integer {\n"
2600 " size = 32; align = %u; signed = false;\n"
2601 " map = clock.%s.value;\n"
2602 "} := uint32_clock_monotonic_t;\n"
2604 "typealias integer {\n"
2605 " size = 64; align = %u; signed = false;\n"
2606 " map = clock.%s.value;\n"
2607 "} := uint64_clock_monotonic_t;\n\n",
2609 lttng_alignof(uint32_t) * CHAR_BIT
,
2611 lttng_alignof(uint64_t) * CHAR_BIT
,
2617 ret
= _lttng_stream_packet_context_declare(session
);
2621 ret
= _lttng_event_header_declare(session
);
2626 list_for_each_entry(chan
, &session
->chan
, list
) {
2627 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2632 list_for_each_entry(event
, &session
->events
, list
) {
2633 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2637 session
->metadata_dumped
= 1;
2643 * lttng_transport_register - LTT transport registration
2644 * @transport: transport structure
2646 * Registers a transport which can be used as output to extract the data out of
2647 * LTTng. The module calling this registration function must ensure that no
2648 * trap-inducing code will be executed by the transport functions. E.g.
2649 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2650 * is made visible to the transport function. This registration acts as a
2651 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2652 * after its registration must it synchronize the TLBs.
2654 void lttng_transport_register(struct lttng_transport
*transport
)
2657 * Make sure no page fault can be triggered by the module about to be
2658 * registered. We deal with this here so we don't have to call
2659 * vmalloc_sync_all() in each module's init.
2661 wrapper_vmalloc_sync_all();
2663 mutex_lock(&sessions_mutex
);
2664 list_add_tail(&transport
->node
, <tng_transport_list
);
2665 mutex_unlock(&sessions_mutex
);
2667 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2670 * lttng_transport_unregister - LTT transport unregistration
2671 * @transport: transport structure
2673 void lttng_transport_unregister(struct lttng_transport
*transport
)
2675 mutex_lock(&sessions_mutex
);
2676 list_del(&transport
->node
);
2677 mutex_unlock(&sessions_mutex
);
2679 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2681 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2683 enum cpuhp_state lttng_hp_prepare
;
2684 enum cpuhp_state lttng_hp_online
;
2686 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2688 struct lttng_cpuhp_node
*lttng_node
;
2690 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2691 switch (lttng_node
->component
) {
2692 case LTTNG_RING_BUFFER_FRONTEND
:
2694 case LTTNG_RING_BUFFER_BACKEND
:
2695 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2696 case LTTNG_RING_BUFFER_ITER
:
2698 case LTTNG_CONTEXT_PERF_COUNTERS
:
2705 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2707 struct lttng_cpuhp_node
*lttng_node
;
2709 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2710 switch (lttng_node
->component
) {
2711 case LTTNG_RING_BUFFER_FRONTEND
:
2712 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2713 case LTTNG_RING_BUFFER_BACKEND
:
2715 case LTTNG_RING_BUFFER_ITER
:
2717 case LTTNG_CONTEXT_PERF_COUNTERS
:
2718 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2724 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2726 struct lttng_cpuhp_node
*lttng_node
;
2728 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2729 switch (lttng_node
->component
) {
2730 case LTTNG_RING_BUFFER_FRONTEND
:
2731 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2732 case LTTNG_RING_BUFFER_BACKEND
:
2734 case LTTNG_RING_BUFFER_ITER
:
2735 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2736 case LTTNG_CONTEXT_PERF_COUNTERS
:
2737 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2743 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2745 struct lttng_cpuhp_node
*lttng_node
;
2747 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2748 switch (lttng_node
->component
) {
2749 case LTTNG_RING_BUFFER_FRONTEND
:
2750 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2751 case LTTNG_RING_BUFFER_BACKEND
:
2753 case LTTNG_RING_BUFFER_ITER
:
2755 case LTTNG_CONTEXT_PERF_COUNTERS
:
2762 static int __init
lttng_init_cpu_hotplug(void)
2766 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2767 lttng_hotplug_prepare
,
2768 lttng_hotplug_dead
);
2772 lttng_hp_prepare
= ret
;
2773 lttng_rb_set_hp_prepare(ret
);
2775 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2776 lttng_hotplug_online
,
2777 lttng_hotplug_offline
);
2779 cpuhp_remove_multi_state(lttng_hp_prepare
);
2780 lttng_hp_prepare
= 0;
2783 lttng_hp_online
= ret
;
2784 lttng_rb_set_hp_online(ret
);
2789 static void __exit
lttng_exit_cpu_hotplug(void)
2791 lttng_rb_set_hp_online(0);
2792 cpuhp_remove_multi_state(lttng_hp_online
);
2793 lttng_rb_set_hp_prepare(0);
2794 cpuhp_remove_multi_state(lttng_hp_prepare
);
2797 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2798 static int lttng_init_cpu_hotplug(void)
2802 static void lttng_exit_cpu_hotplug(void)
2805 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2808 static int __init
lttng_events_init(void)
2812 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2815 ret
= wrapper_get_pfnblock_flags_mask_init();
2818 ret
= wrapper_get_pageblock_flags_mask_init();
2821 ret
= lttng_probes_init();
2824 ret
= lttng_context_init();
2827 ret
= lttng_tracepoint_init();
2830 event_cache
= KMEM_CACHE(lttng_event
, 0);
2835 ret
= lttng_abi_init();
2838 ret
= lttng_logger_init();
2841 ret
= lttng_init_cpu_hotplug();
2844 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2845 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2846 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2847 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2848 LTTNG_MODULES_EXTRAVERSION
,
2850 #ifdef LTTNG_EXTRA_VERSION_GIT
2851 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2855 #ifdef LTTNG_EXTRA_VERSION_NAME
2856 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2863 lttng_logger_exit();
2867 kmem_cache_destroy(event_cache
);
2869 lttng_tracepoint_exit();
2871 lttng_context_exit();
2872 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2873 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2874 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2875 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2876 LTTNG_MODULES_EXTRAVERSION
,
2878 #ifdef LTTNG_EXTRA_VERSION_GIT
2879 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2883 #ifdef LTTNG_EXTRA_VERSION_NAME
2884 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2891 module_init(lttng_events_init
);
2893 static void __exit
lttng_events_exit(void)
2895 struct lttng_session
*session
, *tmpsession
;
2897 lttng_exit_cpu_hotplug();
2898 lttng_logger_exit();
2900 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2901 lttng_session_destroy(session
);
2902 kmem_cache_destroy(event_cache
);
2903 lttng_tracepoint_exit();
2904 lttng_context_exit();
2905 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2906 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2907 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2908 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2909 LTTNG_MODULES_EXTRAVERSION
,
2911 #ifdef LTTNG_EXTRA_VERSION_GIT
2912 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2916 #ifdef LTTNG_EXTRA_VERSION_NAME
2917 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2923 module_exit(lttng_events_exit
);
2925 #include "extra_version/patches.i"
2926 #ifdef LTTNG_EXTRA_VERSION_GIT
2927 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
2929 #ifdef LTTNG_EXTRA_VERSION_NAME
2930 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
2932 MODULE_LICENSE("GPL and additional rights");
2933 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2934 MODULE_DESCRIPTION("LTTng tracer");
2935 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
2936 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
2937 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
2938 LTTNG_MODULES_EXTRAVERSION
);