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)
80 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
81 #ifdef CONFIG_PREEMPT_RT_FULL
84 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
85 #ifdef CONFIG_PREEMPT_RT
88 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
91 void lttng_lock_sessions(void)
93 mutex_lock(&sessions_mutex
);
96 void lttng_unlock_sessions(void)
98 mutex_unlock(&sessions_mutex
);
102 * Called with sessions lock held.
104 int lttng_session_active(void)
106 struct lttng_session
*iter
;
108 list_for_each_entry(iter
, &sessions
, list
) {
115 struct lttng_session
*lttng_session_create(void)
117 struct lttng_session
*session
;
118 struct lttng_metadata_cache
*metadata_cache
;
121 mutex_lock(&sessions_mutex
);
122 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
125 INIT_LIST_HEAD(&session
->chan
);
126 INIT_LIST_HEAD(&session
->events
);
127 uuid_le_gen(&session
->uuid
);
129 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
132 goto err_free_session
;
133 metadata_cache
->data
= lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
134 if (!metadata_cache
->data
)
136 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
137 kref_init(&metadata_cache
->refcount
);
138 mutex_init(&metadata_cache
->lock
);
139 session
->metadata_cache
= metadata_cache
;
140 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
141 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
142 sizeof(metadata_cache
->uuid
));
143 INIT_LIST_HEAD(&session
->enablers_head
);
144 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
145 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
146 list_add(&session
->list
, &sessions
);
147 mutex_unlock(&sessions_mutex
);
151 kfree(metadata_cache
);
153 lttng_kvfree(session
);
155 mutex_unlock(&sessions_mutex
);
159 void metadata_cache_destroy(struct kref
*kref
)
161 struct lttng_metadata_cache
*cache
=
162 container_of(kref
, struct lttng_metadata_cache
, refcount
);
167 void lttng_session_destroy(struct lttng_session
*session
)
169 struct lttng_channel
*chan
, *tmpchan
;
170 struct lttng_event
*event
, *tmpevent
;
171 struct lttng_metadata_stream
*metadata_stream
;
172 struct lttng_enabler
*enabler
, *tmpenabler
;
175 mutex_lock(&sessions_mutex
);
176 WRITE_ONCE(session
->active
, 0);
177 list_for_each_entry(chan
, &session
->chan
, list
) {
178 ret
= lttng_syscalls_unregister(chan
);
181 list_for_each_entry(event
, &session
->events
, list
) {
182 ret
= _lttng_event_unregister(event
);
185 synchronize_trace(); /* Wait for in-flight events to complete */
186 list_for_each_entry_safe(enabler
, tmpenabler
,
187 &session
->enablers_head
, node
)
188 lttng_enabler_destroy(enabler
);
189 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
190 _lttng_event_destroy(event
);
191 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
192 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
193 _lttng_channel_destroy(chan
);
195 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
196 _lttng_metadata_channel_hangup(metadata_stream
);
197 if (session
->pid_tracker
)
198 lttng_pid_tracker_destroy(session
->pid_tracker
);
199 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
200 list_del(&session
->list
);
201 mutex_unlock(&sessions_mutex
);
202 lttng_kvfree(session
);
205 int lttng_session_statedump(struct lttng_session
*session
)
209 mutex_lock(&sessions_mutex
);
210 ret
= lttng_statedump_start(session
);
211 mutex_unlock(&sessions_mutex
);
215 int lttng_session_enable(struct lttng_session
*session
)
218 struct lttng_channel
*chan
;
220 mutex_lock(&sessions_mutex
);
221 if (session
->active
) {
226 /* Set transient enabler state to "enabled" */
230 * Snapshot the number of events per channel to know the type of header
233 list_for_each_entry(chan
, &session
->chan
, list
) {
234 if (chan
->header_type
)
235 continue; /* don't change it if session stop/restart */
236 if (chan
->free_event_id
< 31)
237 chan
->header_type
= 1; /* compact */
239 chan
->header_type
= 2; /* large */
242 /* We need to sync enablers with session before activation. */
243 lttng_session_sync_enablers(session
);
245 /* Clear each stream's quiescent state. */
246 list_for_each_entry(chan
, &session
->chan
, list
) {
247 if (chan
->channel_type
!= METADATA_CHANNEL
)
248 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
251 WRITE_ONCE(session
->active
, 1);
252 WRITE_ONCE(session
->been_active
, 1);
253 ret
= _lttng_session_metadata_statedump(session
);
255 WRITE_ONCE(session
->active
, 0);
258 ret
= lttng_statedump_start(session
);
260 WRITE_ONCE(session
->active
, 0);
262 mutex_unlock(&sessions_mutex
);
266 int lttng_session_disable(struct lttng_session
*session
)
269 struct lttng_channel
*chan
;
271 mutex_lock(&sessions_mutex
);
272 if (!session
->active
) {
276 WRITE_ONCE(session
->active
, 0);
278 /* Set transient enabler state to "disabled" */
280 lttng_session_sync_enablers(session
);
282 /* Set each stream's quiescent state. */
283 list_for_each_entry(chan
, &session
->chan
, list
) {
284 if (chan
->channel_type
!= METADATA_CHANNEL
)
285 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
288 mutex_unlock(&sessions_mutex
);
292 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
295 struct lttng_channel
*chan
;
296 struct lttng_event
*event
;
297 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
298 struct lttng_metadata_stream
*stream
;
300 mutex_lock(&sessions_mutex
);
301 if (!session
->active
) {
306 mutex_lock(&cache
->lock
);
307 memset(cache
->data
, 0, cache
->cache_alloc
);
308 cache
->metadata_written
= 0;
310 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
311 stream
->metadata_out
= 0;
312 stream
->metadata_in
= 0;
314 mutex_unlock(&cache
->lock
);
316 session
->metadata_dumped
= 0;
317 list_for_each_entry(chan
, &session
->chan
, list
) {
318 chan
->metadata_dumped
= 0;
321 list_for_each_entry(event
, &session
->events
, list
) {
322 event
->metadata_dumped
= 0;
325 ret
= _lttng_session_metadata_statedump(session
);
328 mutex_unlock(&sessions_mutex
);
332 int lttng_channel_enable(struct lttng_channel
*channel
)
336 mutex_lock(&sessions_mutex
);
337 if (channel
->channel_type
== METADATA_CHANNEL
) {
341 if (channel
->enabled
) {
345 /* Set transient enabler state to "enabled" */
347 lttng_session_sync_enablers(channel
->session
);
348 /* Set atomically the state to "enabled" */
349 WRITE_ONCE(channel
->enabled
, 1);
351 mutex_unlock(&sessions_mutex
);
355 int lttng_channel_disable(struct lttng_channel
*channel
)
359 mutex_lock(&sessions_mutex
);
360 if (channel
->channel_type
== METADATA_CHANNEL
) {
364 if (!channel
->enabled
) {
368 /* Set atomically the state to "disabled" */
369 WRITE_ONCE(channel
->enabled
, 0);
370 /* Set transient enabler state to "enabled" */
372 lttng_session_sync_enablers(channel
->session
);
374 mutex_unlock(&sessions_mutex
);
378 int lttng_event_enable(struct lttng_event
*event
)
382 mutex_lock(&sessions_mutex
);
383 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
387 if (event
->enabled
) {
391 switch (event
->instrumentation
) {
392 case LTTNG_KERNEL_TRACEPOINT
:
393 case LTTNG_KERNEL_SYSCALL
:
396 case LTTNG_KERNEL_KPROBE
:
397 case LTTNG_KERNEL_FUNCTION
:
398 case LTTNG_KERNEL_UPROBE
:
399 case LTTNG_KERNEL_NOOP
:
400 WRITE_ONCE(event
->enabled
, 1);
402 case LTTNG_KERNEL_KRETPROBE
:
403 ret
= lttng_kretprobes_event_enable_state(event
, 1);
410 mutex_unlock(&sessions_mutex
);
414 int lttng_event_disable(struct lttng_event
*event
)
418 mutex_lock(&sessions_mutex
);
419 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
423 if (!event
->enabled
) {
427 switch (event
->instrumentation
) {
428 case LTTNG_KERNEL_TRACEPOINT
:
429 case LTTNG_KERNEL_SYSCALL
:
432 case LTTNG_KERNEL_KPROBE
:
433 case LTTNG_KERNEL_FUNCTION
:
434 case LTTNG_KERNEL_UPROBE
:
435 case LTTNG_KERNEL_NOOP
:
436 WRITE_ONCE(event
->enabled
, 0);
438 case LTTNG_KERNEL_KRETPROBE
:
439 ret
= lttng_kretprobes_event_enable_state(event
, 0);
446 mutex_unlock(&sessions_mutex
);
450 static struct lttng_transport
*lttng_transport_find(const char *name
)
452 struct lttng_transport
*transport
;
454 list_for_each_entry(transport
, <tng_transport_list
, node
) {
455 if (!strcmp(transport
->name
, name
))
461 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
462 const char *transport_name
,
464 size_t subbuf_size
, size_t num_subbuf
,
465 unsigned int switch_timer_interval
,
466 unsigned int read_timer_interval
,
467 enum channel_type channel_type
)
469 struct lttng_channel
*chan
;
470 struct lttng_transport
*transport
= NULL
;
472 mutex_lock(&sessions_mutex
);
473 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
474 goto active
; /* Refuse to add channel to active session */
475 transport
= lttng_transport_find(transport_name
);
477 printk(KERN_WARNING
"LTTng transport %s not found\n",
481 if (!try_module_get(transport
->owner
)) {
482 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
485 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
488 chan
->session
= session
;
489 chan
->id
= session
->free_chan_id
++;
490 chan
->ops
= &transport
->ops
;
492 * Note: the channel creation op already writes into the packet
493 * headers. Therefore the "chan" information used as input
494 * should be already accessible.
496 chan
->chan
= transport
->ops
.channel_create(transport_name
,
497 chan
, buf_addr
, subbuf_size
, num_subbuf
,
498 switch_timer_interval
, read_timer_interval
);
503 chan
->transport
= transport
;
504 chan
->channel_type
= channel_type
;
505 list_add(&chan
->list
, &session
->chan
);
506 mutex_unlock(&sessions_mutex
);
513 module_put(transport
->owner
);
516 mutex_unlock(&sessions_mutex
);
521 * Only used internally at session destruction for per-cpu channels, and
522 * when metadata channel is released.
523 * Needs to be called with sessions mutex held.
526 void _lttng_channel_destroy(struct lttng_channel
*chan
)
528 chan
->ops
->channel_destroy(chan
->chan
);
529 module_put(chan
->transport
->owner
);
530 list_del(&chan
->list
);
531 lttng_destroy_context(chan
->ctx
);
535 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
537 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
539 /* Protect the metadata cache with the sessions_mutex. */
540 mutex_lock(&sessions_mutex
);
541 _lttng_channel_destroy(chan
);
542 mutex_unlock(&sessions_mutex
);
544 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
547 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
549 stream
->finalized
= 1;
550 wake_up_interruptible(&stream
->read_wait
);
554 * Supports event creation while tracing session is active.
555 * Needs to be called with sessions mutex held.
557 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
558 struct lttng_kernel_event
*event_param
,
560 const struct lttng_event_desc
*event_desc
,
561 enum lttng_kernel_instrumentation itype
)
563 struct lttng_session
*session
= chan
->session
;
564 struct lttng_event
*event
;
565 const char *event_name
;
566 struct hlist_head
*head
;
571 if (chan
->free_event_id
== -1U) {
577 case LTTNG_KERNEL_TRACEPOINT
:
578 event_name
= event_desc
->name
;
580 case LTTNG_KERNEL_KPROBE
:
581 case LTTNG_KERNEL_UPROBE
:
582 case LTTNG_KERNEL_KRETPROBE
:
583 case LTTNG_KERNEL_FUNCTION
:
584 case LTTNG_KERNEL_NOOP
:
585 case LTTNG_KERNEL_SYSCALL
:
586 event_name
= event_param
->name
;
593 name_len
= strlen(event_name
);
594 hash
= jhash(event_name
, name_len
, 0);
595 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
596 lttng_hlist_for_each_entry(event
, head
, hlist
) {
597 WARN_ON_ONCE(!event
->desc
);
598 if (!strncmp(event
->desc
->name
, event_name
,
599 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
600 && chan
== event
->chan
) {
606 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
612 event
->filter
= filter
;
613 event
->id
= chan
->free_event_id
++;
614 event
->instrumentation
= itype
;
615 event
->evtype
= LTTNG_TYPE_EVENT
;
616 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
617 INIT_LIST_HEAD(&event
->enablers_ref_head
);
620 case LTTNG_KERNEL_TRACEPOINT
:
621 /* Event will be enabled by enabler sync. */
623 event
->registered
= 0;
624 event
->desc
= lttng_event_get(event_name
);
629 /* Populate lttng_event structure before event registration. */
632 case LTTNG_KERNEL_KPROBE
:
634 * Needs to be explicitly enabled after creation, since
635 * we may want to apply filters.
638 event
->registered
= 1;
640 * Populate lttng_event structure before event
644 ret
= lttng_kprobes_register(event_name
,
645 event_param
->u
.kprobe
.symbol_name
,
646 event_param
->u
.kprobe
.offset
,
647 event_param
->u
.kprobe
.addr
,
653 ret
= try_module_get(event
->desc
->owner
);
656 case LTTNG_KERNEL_KRETPROBE
:
658 struct lttng_event
*event_return
;
660 /* kretprobe defines 2 events */
662 * Needs to be explicitly enabled after creation, since
663 * we may want to apply filters.
666 event
->registered
= 1;
668 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
673 event_return
->chan
= chan
;
674 event_return
->filter
= filter
;
675 event_return
->id
= chan
->free_event_id
++;
676 event_return
->enabled
= 0;
677 event_return
->registered
= 1;
678 event_return
->instrumentation
= itype
;
680 * Populate lttng_event structure before kretprobe registration.
683 ret
= lttng_kretprobes_register(event_name
,
684 event_param
->u
.kretprobe
.symbol_name
,
685 event_param
->u
.kretprobe
.offset
,
686 event_param
->u
.kretprobe
.addr
,
687 event
, event_return
);
689 kmem_cache_free(event_cache
, event_return
);
693 /* Take 2 refs on the module: one per event. */
694 ret
= try_module_get(event
->desc
->owner
);
696 ret
= try_module_get(event
->desc
->owner
);
698 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
700 WARN_ON_ONCE(ret
> 0);
702 kmem_cache_free(event_cache
, event_return
);
703 module_put(event
->desc
->owner
);
704 module_put(event
->desc
->owner
);
705 goto statedump_error
;
707 list_add(&event_return
->list
, &chan
->session
->events
);
710 case LTTNG_KERNEL_FUNCTION
:
712 * Needs to be explicitly enabled after creation, since
713 * we may want to apply filters.
716 event
->registered
= 1;
718 * Populate lttng_event structure before event
722 ret
= lttng_ftrace_register(event_name
,
723 event_param
->u
.ftrace
.symbol_name
,
728 ret
= try_module_get(event
->desc
->owner
);
731 case LTTNG_KERNEL_NOOP
:
732 case LTTNG_KERNEL_SYSCALL
:
734 * Needs to be explicitly enabled after creation, since
735 * we may want to apply filters.
738 event
->registered
= 0;
739 event
->desc
= event_desc
;
745 case LTTNG_KERNEL_UPROBE
:
747 ret
= lttng_uprobes_register(event_param
->name
,
748 event_param
->u
.uprobe
.path
,
749 event_param
->u
.uprobe
.offset
,
753 ret
= try_module_get(event
->desc
->owner
);
761 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
762 WARN_ON_ONCE(ret
> 0);
764 goto statedump_error
;
766 hlist_add_head(&event
->hlist
, head
);
767 list_add(&event
->list
, &chan
->session
->events
);
771 /* If a statedump error occurs, events will not be readable. */
773 kmem_cache_free(event_cache
, event
);
781 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
782 struct lttng_kernel_event
*event_param
,
784 const struct lttng_event_desc
*event_desc
,
785 enum lttng_kernel_instrumentation itype
)
787 struct lttng_event
*event
;
789 mutex_lock(&sessions_mutex
);
790 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
792 mutex_unlock(&sessions_mutex
);
796 /* Only used for tracepoints for now. */
798 void register_event(struct lttng_event
*event
)
800 const struct lttng_event_desc
*desc
;
803 if (event
->registered
)
807 switch (event
->instrumentation
) {
808 case LTTNG_KERNEL_TRACEPOINT
:
809 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
810 desc
->probe_callback
,
813 case LTTNG_KERNEL_SYSCALL
:
814 ret
= lttng_syscall_filter_enable(event
->chan
,
817 case LTTNG_KERNEL_KPROBE
:
818 case LTTNG_KERNEL_KRETPROBE
:
819 case LTTNG_KERNEL_FUNCTION
:
820 case LTTNG_KERNEL_NOOP
:
827 event
->registered
= 1;
831 * Only used internally at session destruction.
833 int _lttng_event_unregister(struct lttng_event
*event
)
835 const struct lttng_event_desc
*desc
;
838 if (!event
->registered
)
842 switch (event
->instrumentation
) {
843 case LTTNG_KERNEL_TRACEPOINT
:
844 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
845 event
->desc
->probe_callback
,
848 case LTTNG_KERNEL_KPROBE
:
849 lttng_kprobes_unregister(event
);
852 case LTTNG_KERNEL_KRETPROBE
:
853 lttng_kretprobes_unregister(event
);
856 case LTTNG_KERNEL_FUNCTION
:
857 lttng_ftrace_unregister(event
);
860 case LTTNG_KERNEL_SYSCALL
:
861 ret
= lttng_syscall_filter_disable(event
->chan
,
864 case LTTNG_KERNEL_NOOP
:
867 case LTTNG_KERNEL_UPROBE
:
868 lttng_uprobes_unregister(event
);
875 event
->registered
= 0;
880 * Only used internally at session destruction.
883 void _lttng_event_destroy(struct lttng_event
*event
)
885 switch (event
->instrumentation
) {
886 case LTTNG_KERNEL_TRACEPOINT
:
887 lttng_event_put(event
->desc
);
889 case LTTNG_KERNEL_KPROBE
:
890 module_put(event
->desc
->owner
);
891 lttng_kprobes_destroy_private(event
);
893 case LTTNG_KERNEL_KRETPROBE
:
894 module_put(event
->desc
->owner
);
895 lttng_kretprobes_destroy_private(event
);
897 case LTTNG_KERNEL_FUNCTION
:
898 module_put(event
->desc
->owner
);
899 lttng_ftrace_destroy_private(event
);
901 case LTTNG_KERNEL_NOOP
:
902 case LTTNG_KERNEL_SYSCALL
:
904 case LTTNG_KERNEL_UPROBE
:
905 module_put(event
->desc
->owner
);
906 lttng_uprobes_destroy_private(event
);
911 list_del(&event
->list
);
912 lttng_destroy_context(event
->ctx
);
913 kmem_cache_free(event_cache
, event
);
916 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
922 mutex_lock(&sessions_mutex
);
924 /* track all pids: destroy tracker. */
925 if (session
->pid_tracker
) {
926 struct lttng_pid_tracker
*lpf
;
928 lpf
= session
->pid_tracker
;
929 rcu_assign_pointer(session
->pid_tracker
, NULL
);
931 lttng_pid_tracker_destroy(lpf
);
935 if (!session
->pid_tracker
) {
936 struct lttng_pid_tracker
*lpf
;
938 lpf
= lttng_pid_tracker_create();
943 ret
= lttng_pid_tracker_add(lpf
, pid
);
944 rcu_assign_pointer(session
->pid_tracker
, lpf
);
946 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
950 mutex_unlock(&sessions_mutex
);
954 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
960 mutex_lock(&sessions_mutex
);
962 /* untrack all pids: replace by empty tracker. */
963 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
964 struct lttng_pid_tracker
*lpf
;
966 lpf
= lttng_pid_tracker_create();
971 rcu_assign_pointer(session
->pid_tracker
, lpf
);
974 lttng_pid_tracker_destroy(old_lpf
);
977 if (!session
->pid_tracker
) {
981 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
984 mutex_unlock(&sessions_mutex
);
989 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
991 struct lttng_session
*session
= m
->private;
992 struct lttng_pid_tracker
*lpf
;
993 struct lttng_pid_hash_node
*e
;
996 mutex_lock(&sessions_mutex
);
997 lpf
= session
->pid_tracker
;
999 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1000 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1002 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1008 /* PID tracker disabled. */
1009 if (iter
>= *pos
&& iter
== 0) {
1010 return session
; /* empty tracker */
1018 /* Called with sessions_mutex held. */
1020 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1022 struct lttng_session
*session
= m
->private;
1023 struct lttng_pid_tracker
*lpf
;
1024 struct lttng_pid_hash_node
*e
;
1028 lpf
= session
->pid_tracker
;
1030 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1031 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1033 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1034 if (iter
++ >= *ppos
)
1039 /* PID tracker disabled. */
1040 if (iter
>= *ppos
&& iter
== 0)
1041 return session
; /* empty tracker */
1050 void pid_list_stop(struct seq_file
*m
, void *p
)
1052 mutex_unlock(&sessions_mutex
);
1056 int pid_list_show(struct seq_file
*m
, void *p
)
1060 if (p
== m
->private) {
1061 /* Tracker disabled. */
1064 const struct lttng_pid_hash_node
*e
= p
;
1066 pid
= lttng_pid_tracker_get_node_pid(e
);
1068 seq_printf(m
, "process { pid = %d; };\n", pid
);
1073 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1074 .start
= pid_list_start
,
1075 .next
= pid_list_next
,
1076 .stop
= pid_list_stop
,
1077 .show
= pid_list_show
,
1081 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1083 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1087 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1089 struct seq_file
*m
= file
->private_data
;
1090 struct lttng_session
*session
= m
->private;
1093 WARN_ON_ONCE(!session
);
1094 ret
= seq_release(inode
, file
);
1095 if (!ret
&& session
)
1096 fput(session
->file
);
1100 const struct file_operations lttng_tracker_pids_list_fops
= {
1101 .owner
= THIS_MODULE
,
1102 .open
= lttng_tracker_pids_list_open
,
1104 .llseek
= seq_lseek
,
1105 .release
= lttng_tracker_pids_list_release
,
1108 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1110 struct file
*tracker_pids_list_file
;
1114 file_fd
= lttng_get_unused_fd();
1120 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1121 <tng_tracker_pids_list_fops
,
1123 if (IS_ERR(tracker_pids_list_file
)) {
1124 ret
= PTR_ERR(tracker_pids_list_file
);
1127 if (atomic_long_add_unless(&session
->file
->f_count
,
1128 1, INT_MAX
) == INT_MAX
) {
1129 goto refcount_error
;
1131 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1134 m
= tracker_pids_list_file
->private_data
;
1135 m
->private = session
;
1136 fd_install(file_fd
, tracker_pids_list_file
);
1141 atomic_long_dec(&session
->file
->f_count
);
1143 fput(tracker_pids_list_file
);
1145 put_unused_fd(file_fd
);
1151 * Enabler management.
1154 int lttng_match_enabler_star_glob(const char *desc_name
,
1155 const char *pattern
)
1157 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1158 desc_name
, LTTNG_SIZE_MAX
))
1164 int lttng_match_enabler_name(const char *desc_name
,
1167 if (strcmp(desc_name
, name
))
1173 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1174 struct lttng_enabler
*enabler
)
1176 const char *desc_name
, *enabler_name
;
1178 enabler_name
= enabler
->event_param
.name
;
1179 switch (enabler
->event_param
.instrumentation
) {
1180 case LTTNG_KERNEL_TRACEPOINT
:
1181 desc_name
= desc
->name
;
1183 case LTTNG_KERNEL_SYSCALL
:
1184 desc_name
= desc
->name
;
1185 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1186 desc_name
+= strlen("compat_");
1187 if (!strncmp(desc_name
, "syscall_exit_",
1188 strlen("syscall_exit_"))) {
1189 desc_name
+= strlen("syscall_exit_");
1190 } else if (!strncmp(desc_name
, "syscall_entry_",
1191 strlen("syscall_entry_"))) {
1192 desc_name
+= strlen("syscall_entry_");
1202 switch (enabler
->type
) {
1203 case LTTNG_ENABLER_STAR_GLOB
:
1204 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1205 case LTTNG_ENABLER_NAME
:
1206 return lttng_match_enabler_name(desc_name
, enabler_name
);
1213 int lttng_event_match_enabler(struct lttng_event
*event
,
1214 struct lttng_enabler
*enabler
)
1216 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1218 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1219 && event
->chan
== enabler
->chan
)
1226 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1227 struct lttng_enabler
*enabler
)
1229 struct lttng_enabler_ref
*enabler_ref
;
1231 list_for_each_entry(enabler_ref
,
1232 &event
->enablers_ref_head
, node
) {
1233 if (enabler_ref
->ref
== enabler
)
1240 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1242 struct lttng_session
*session
= enabler
->chan
->session
;
1243 struct lttng_probe_desc
*probe_desc
;
1244 const struct lttng_event_desc
*desc
;
1246 struct list_head
*probe_list
;
1248 probe_list
= lttng_get_probe_list_head();
1250 * For each probe event, if we find that a probe event matches
1251 * our enabler, create an associated lttng_event if not
1254 list_for_each_entry(probe_desc
, probe_list
, head
) {
1255 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1257 struct hlist_head
*head
;
1258 const char *event_name
;
1261 struct lttng_event
*event
;
1263 desc
= probe_desc
->event_desc
[i
];
1264 if (!lttng_desc_match_enabler(desc
, enabler
))
1266 event_name
= desc
->name
;
1267 name_len
= strlen(event_name
);
1270 * Check if already created.
1272 hash
= jhash(event_name
, name_len
, 0);
1273 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1274 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1275 if (event
->desc
== desc
1276 && event
->chan
== enabler
->chan
)
1283 * We need to create an event for this
1286 event
= _lttng_event_create(enabler
->chan
,
1288 LTTNG_KERNEL_TRACEPOINT
);
1290 printk(KERN_INFO
"Unable to create event %s\n",
1291 probe_desc
->event_desc
[i
]->name
);
1298 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1302 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1307 * Create struct lttng_event if it is missing and present in the list of
1308 * tracepoint probes.
1309 * Should be called with sessions mutex held.
1312 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1314 switch (enabler
->event_param
.instrumentation
) {
1315 case LTTNG_KERNEL_TRACEPOINT
:
1316 lttng_create_tracepoint_if_missing(enabler
);
1318 case LTTNG_KERNEL_SYSCALL
:
1319 lttng_create_syscall_if_missing(enabler
);
1328 * Create events associated with an enabler (if not already present),
1329 * and add backward reference from the event to the enabler.
1330 * Should be called with sessions mutex held.
1333 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1335 struct lttng_session
*session
= enabler
->chan
->session
;
1336 struct lttng_event
*event
;
1338 /* First ensure that probe events are created for this enabler. */
1339 lttng_create_event_if_missing(enabler
);
1341 /* For each event matching enabler in session event list. */
1342 list_for_each_entry(event
, &session
->events
, list
) {
1343 struct lttng_enabler_ref
*enabler_ref
;
1345 if (!lttng_event_match_enabler(event
, enabler
))
1347 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1350 * If no backward ref, create it.
1351 * Add backward ref from event to enabler.
1353 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1356 enabler_ref
->ref
= enabler
;
1357 list_add(&enabler_ref
->node
,
1358 &event
->enablers_ref_head
);
1362 * Link filter bytecodes if not linked yet.
1364 lttng_enabler_event_link_bytecode(event
, enabler
);
1366 /* TODO: merge event context. */
1372 * Called at module load: connect the probe on all enablers matching
1374 * Called with sessions lock held.
1376 int lttng_fix_pending_events(void)
1378 struct lttng_session
*session
;
1380 list_for_each_entry(session
, &sessions
, list
)
1381 lttng_session_lazy_sync_enablers(session
);
1385 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1386 struct lttng_kernel_event
*event_param
,
1387 struct lttng_channel
*chan
)
1389 struct lttng_enabler
*enabler
;
1391 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1394 enabler
->type
= type
;
1395 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1396 memcpy(&enabler
->event_param
, event_param
,
1397 sizeof(enabler
->event_param
));
1398 enabler
->chan
= chan
;
1400 enabler
->enabled
= 0;
1401 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1402 mutex_lock(&sessions_mutex
);
1403 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1404 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1405 mutex_unlock(&sessions_mutex
);
1409 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1411 mutex_lock(&sessions_mutex
);
1412 enabler
->enabled
= 1;
1413 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1414 mutex_unlock(&sessions_mutex
);
1418 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1420 mutex_lock(&sessions_mutex
);
1421 enabler
->enabled
= 0;
1422 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1423 mutex_unlock(&sessions_mutex
);
1427 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1428 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1430 struct lttng_filter_bytecode_node
*bytecode_node
;
1431 uint32_t bytecode_len
;
1434 ret
= get_user(bytecode_len
, &bytecode
->len
);
1437 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1441 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1442 sizeof(*bytecode
) + bytecode_len
);
1445 bytecode_node
->enabler
= enabler
;
1446 /* Enforce length based on allocated size */
1447 bytecode_node
->bc
.len
= bytecode_len
;
1448 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1449 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1453 kfree(bytecode_node
);
1457 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1458 struct lttng_kernel_context
*context_param
)
1464 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1466 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1468 /* Destroy filter bytecode */
1469 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1470 &enabler
->filter_bytecode_head
, node
) {
1474 /* Destroy contexts */
1475 lttng_destroy_context(enabler
->ctx
);
1477 list_del(&enabler
->node
);
1482 * lttng_session_sync_enablers should be called just before starting a
1484 * Should be called with sessions mutex held.
1487 void lttng_session_sync_enablers(struct lttng_session
*session
)
1489 struct lttng_enabler
*enabler
;
1490 struct lttng_event
*event
;
1492 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1493 lttng_enabler_ref_events(enabler
);
1495 * For each event, if at least one of its enablers is enabled,
1496 * and its channel and session transient states are enabled, we
1497 * enable the event, else we disable it.
1499 list_for_each_entry(event
, &session
->events
, list
) {
1500 struct lttng_enabler_ref
*enabler_ref
;
1501 struct lttng_bytecode_runtime
*runtime
;
1502 int enabled
= 0, has_enablers_without_bytecode
= 0;
1504 switch (event
->instrumentation
) {
1505 case LTTNG_KERNEL_TRACEPOINT
:
1506 case LTTNG_KERNEL_SYSCALL
:
1508 list_for_each_entry(enabler_ref
,
1509 &event
->enablers_ref_head
, node
) {
1510 if (enabler_ref
->ref
->enabled
) {
1517 /* Not handled with lazy sync. */
1521 * Enabled state is based on union of enablers, with
1522 * intesection of session and channel transient enable
1525 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1527 WRITE_ONCE(event
->enabled
, enabled
);
1529 * Sync tracepoint registration with event enabled
1533 register_event(event
);
1535 _lttng_event_unregister(event
);
1538 /* Check if has enablers without bytecode enabled */
1539 list_for_each_entry(enabler_ref
,
1540 &event
->enablers_ref_head
, node
) {
1541 if (enabler_ref
->ref
->enabled
1542 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1543 has_enablers_without_bytecode
= 1;
1547 event
->has_enablers_without_bytecode
=
1548 has_enablers_without_bytecode
;
1550 /* Enable filters */
1551 list_for_each_entry(runtime
,
1552 &event
->bytecode_runtime_head
, node
)
1553 lttng_filter_sync_state(runtime
);
1558 * Apply enablers to session events, adding events to session if need
1559 * be. It is required after each modification applied to an active
1560 * session, and right before session "start".
1561 * "lazy" sync means we only sync if required.
1562 * Should be called with sessions mutex held.
1565 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1567 /* We can skip if session is not active */
1568 if (!session
->active
)
1570 lttng_session_sync_enablers(session
);
1574 * Serialize at most one packet worth of metadata into a metadata
1576 * We grab the metadata cache mutex to get exclusive access to our metadata
1577 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1578 * allows us to do racy operations such as looking for remaining space left in
1579 * packet and write, since mutual exclusion protects us from concurrent writes.
1580 * Mutual exclusion on the metadata cache allow us to read the cache content
1581 * without racing against reallocation of the cache by updates.
1582 * Returns the number of bytes written in the channel, 0 if no data
1583 * was written and a negative value on error.
1585 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1586 struct channel
*chan
)
1588 struct lib_ring_buffer_ctx ctx
;
1590 size_t len
, reserve_len
;
1593 * Ensure we support mutiple get_next / put sequences followed by
1594 * put_next. The metadata cache lock protects reading the metadata
1595 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1596 * "flush" operations on the buffer invoked by different processes.
1597 * Moreover, since the metadata cache memory can be reallocated, we
1598 * need to have exclusive access against updates even though we only
1601 mutex_lock(&stream
->metadata_cache
->lock
);
1602 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1603 if (stream
->metadata_in
!= stream
->metadata_out
)
1606 /* Metadata regenerated, change the version. */
1607 if (stream
->metadata_cache
->version
!= stream
->version
)
1608 stream
->version
= stream
->metadata_cache
->version
;
1610 len
= stream
->metadata_cache
->metadata_written
-
1611 stream
->metadata_in
;
1614 reserve_len
= min_t(size_t,
1615 stream
->transport
->ops
.packet_avail_size(chan
),
1617 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1620 * If reservation failed, return an error to the caller.
1622 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1624 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1627 stream
->transport
->ops
.event_write(&ctx
,
1628 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1630 stream
->transport
->ops
.event_commit(&ctx
);
1631 stream
->metadata_in
+= reserve_len
;
1635 mutex_unlock(&stream
->metadata_cache
->lock
);
1640 * Write the metadata to the metadata cache.
1641 * Must be called with sessions_mutex held.
1642 * The metadata cache lock protects us from concurrent read access from
1643 * thread outputting metadata content to ring buffer.
1645 int lttng_metadata_printf(struct lttng_session
*session
,
1646 const char *fmt
, ...)
1651 struct lttng_metadata_stream
*stream
;
1653 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1656 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1662 mutex_lock(&session
->metadata_cache
->lock
);
1663 if (session
->metadata_cache
->metadata_written
+ len
>
1664 session
->metadata_cache
->cache_alloc
) {
1665 char *tmp_cache_realloc
;
1666 unsigned int tmp_cache_alloc_size
;
1668 tmp_cache_alloc_size
= max_t(unsigned int,
1669 session
->metadata_cache
->cache_alloc
+ len
,
1670 session
->metadata_cache
->cache_alloc
<< 1);
1671 tmp_cache_realloc
= lttng_vzalloc(tmp_cache_alloc_size
);
1672 if (!tmp_cache_realloc
)
1674 if (session
->metadata_cache
->data
) {
1675 memcpy(tmp_cache_realloc
,
1676 session
->metadata_cache
->data
,
1677 session
->metadata_cache
->cache_alloc
);
1678 vfree(session
->metadata_cache
->data
);
1681 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1682 session
->metadata_cache
->data
= tmp_cache_realloc
;
1684 memcpy(session
->metadata_cache
->data
+
1685 session
->metadata_cache
->metadata_written
,
1687 session
->metadata_cache
->metadata_written
+= len
;
1688 mutex_unlock(&session
->metadata_cache
->lock
);
1691 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1692 wake_up_interruptible(&stream
->read_wait
);
1697 mutex_unlock(&session
->metadata_cache
->lock
);
1703 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1707 for (i
= 0; i
< nesting
; i
++) {
1710 ret
= lttng_metadata_printf(session
, " ");
1719 * Must be called with sessions_mutex held.
1722 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1723 const struct lttng_type
*type
,
1727 uint32_t i
, nr_fields
;
1729 ret
= print_tabs(session
, nesting
);
1732 ret
= lttng_metadata_printf(session
,
1736 nr_fields
= type
->u
._struct
.nr_fields
;
1737 for (i
= 0; i
< nr_fields
; i
++) {
1738 const struct lttng_event_field
*iter_field
;
1740 iter_field
= &type
->u
._struct
.fields
[i
];
1741 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1745 ret
= print_tabs(session
, nesting
);
1748 ret
= lttng_metadata_printf(session
,
1754 * Must be called with sessions_mutex held.
1757 int _lttng_struct_statedump(struct lttng_session
*session
,
1758 const struct lttng_event_field
*field
,
1763 ret
= _lttng_struct_type_statedump(session
,
1764 &field
->type
, nesting
);
1767 ret
= lttng_metadata_printf(session
,
1774 * Must be called with sessions_mutex held.
1777 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1778 const struct lttng_type
*type
,
1782 uint32_t i
, nr_choices
;
1784 ret
= print_tabs(session
, nesting
);
1787 ret
= lttng_metadata_printf(session
,
1788 "variant <_%s> {\n",
1789 type
->u
.variant
.tag_name
);
1792 nr_choices
= type
->u
.variant
.nr_choices
;
1793 for (i
= 0; i
< nr_choices
; i
++) {
1794 const struct lttng_event_field
*iter_field
;
1796 iter_field
= &type
->u
.variant
.choices
[i
];
1797 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1801 ret
= print_tabs(session
, nesting
);
1804 ret
= lttng_metadata_printf(session
,
1810 * Must be called with sessions_mutex held.
1813 int _lttng_variant_statedump(struct lttng_session
*session
,
1814 const struct lttng_event_field
*field
,
1819 ret
= _lttng_variant_type_statedump(session
,
1820 &field
->type
, nesting
);
1823 ret
= lttng_metadata_printf(session
,
1830 * Must be called with sessions_mutex held.
1833 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1834 const struct lttng_event_field
*field
,
1838 const struct lttng_type
*elem_type
;
1840 /* Only array of structures and variants are currently supported. */
1841 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1842 switch (elem_type
->atype
) {
1844 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1849 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1856 ret
= lttng_metadata_printf(session
,
1859 field
->type
.u
.array_compound
.length
);
1864 * Must be called with sessions_mutex held.
1867 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1868 const struct lttng_event_field
*field
,
1872 const char *length_name
;
1873 const struct lttng_type
*elem_type
;
1875 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1877 /* Only array of structures and variants are currently supported. */
1878 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1879 switch (elem_type
->atype
) {
1881 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1886 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1893 ret
= lttng_metadata_printf(session
,
1901 * Must be called with sessions_mutex held.
1904 int _lttng_enum_statedump(struct lttng_session
*session
,
1905 const struct lttng_event_field
*field
,
1908 const struct lttng_enum_desc
*enum_desc
;
1909 const struct lttng_integer_type
*container_type
;
1911 unsigned int i
, nr_entries
;
1913 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1914 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1915 nr_entries
= enum_desc
->nr_entries
;
1917 ret
= print_tabs(session
, nesting
);
1920 ret
= lttng_metadata_printf(session
,
1921 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1922 container_type
->size
,
1923 container_type
->alignment
,
1924 container_type
->signedness
,
1925 (container_type
->encoding
== lttng_encode_none
)
1927 : (container_type
->encoding
== lttng_encode_UTF8
)
1930 container_type
->base
,
1931 #if __BYTE_ORDER == __BIG_ENDIAN
1932 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1934 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1939 /* Dump all entries */
1940 for (i
= 0; i
< nr_entries
; i
++) {
1941 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1944 ret
= print_tabs(session
, nesting
+ 1);
1947 ret
= lttng_metadata_printf(session
,
1951 len
= strlen(entry
->string
);
1952 /* Escape the character '"' */
1953 for (j
= 0; j
< len
; j
++) {
1954 char c
= entry
->string
[j
];
1958 ret
= lttng_metadata_printf(session
,
1962 ret
= lttng_metadata_printf(session
,
1966 ret
= lttng_metadata_printf(session
,
1973 ret
= lttng_metadata_printf(session
, "\"");
1977 if (entry
->options
.is_auto
) {
1978 ret
= lttng_metadata_printf(session
, ",\n");
1982 ret
= lttng_metadata_printf(session
,
1986 if (entry
->start
.signedness
)
1987 ret
= lttng_metadata_printf(session
,
1988 "%lld", (long long) entry
->start
.value
);
1990 ret
= lttng_metadata_printf(session
,
1991 "%llu", entry
->start
.value
);
1994 if (entry
->start
.signedness
== entry
->end
.signedness
&&
1996 == entry
->end
.value
) {
1997 ret
= lttng_metadata_printf(session
,
2000 if (entry
->end
.signedness
) {
2001 ret
= lttng_metadata_printf(session
,
2003 (long long) entry
->end
.value
);
2005 ret
= lttng_metadata_printf(session
,
2014 ret
= print_tabs(session
, nesting
);
2017 ret
= lttng_metadata_printf(session
, "} _%s;\n",
2024 * Must be called with sessions_mutex held.
2027 int _lttng_field_statedump(struct lttng_session
*session
,
2028 const struct lttng_event_field
*field
,
2033 switch (field
->type
.atype
) {
2035 ret
= print_tabs(session
, nesting
);
2038 ret
= lttng_metadata_printf(session
,
2039 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2040 field
->type
.u
.basic
.integer
.size
,
2041 field
->type
.u
.basic
.integer
.alignment
,
2042 field
->type
.u
.basic
.integer
.signedness
,
2043 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2045 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2048 field
->type
.u
.basic
.integer
.base
,
2049 #if __BYTE_ORDER == __BIG_ENDIAN
2050 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2052 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2057 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2060 case atype_array_bitfield
:
2062 const struct lttng_basic_type
*elem_type
;
2064 elem_type
= &field
->type
.u
.array
.elem_type
;
2065 if (field
->type
.u
.array
.elem_alignment
) {
2066 ret
= print_tabs(session
, nesting
);
2069 ret
= lttng_metadata_printf(session
,
2070 "struct { } align(%u) _%s_padding;\n",
2071 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2076 ret
= print_tabs(session
, nesting
);
2079 ret
= lttng_metadata_printf(session
,
2080 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2081 elem_type
->u
.basic
.integer
.size
,
2082 elem_type
->u
.basic
.integer
.alignment
,
2083 elem_type
->u
.basic
.integer
.signedness
,
2084 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2086 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2089 elem_type
->u
.basic
.integer
.base
,
2090 #if __BYTE_ORDER == __BIG_ENDIAN
2091 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2093 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2095 field
->name
, field
->type
.u
.array
.length
);
2098 case atype_sequence
:
2099 case atype_sequence_bitfield
:
2101 const struct lttng_basic_type
*elem_type
;
2102 const struct lttng_basic_type
*length_type
;
2104 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2105 length_type
= &field
->type
.u
.sequence
.length_type
;
2106 ret
= print_tabs(session
, nesting
);
2109 ret
= lttng_metadata_printf(session
,
2110 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2111 length_type
->u
.basic
.integer
.size
,
2112 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2113 length_type
->u
.basic
.integer
.signedness
,
2114 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2116 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2119 length_type
->u
.basic
.integer
.base
,
2120 #if __BYTE_ORDER == __BIG_ENDIAN
2121 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2123 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2129 if (field
->type
.u
.sequence
.elem_alignment
) {
2130 ret
= print_tabs(session
, nesting
);
2133 ret
= lttng_metadata_printf(session
,
2134 "struct { } align(%u) _%s_padding;\n",
2135 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2140 ret
= print_tabs(session
, nesting
);
2143 ret
= lttng_metadata_printf(session
,
2144 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2145 elem_type
->u
.basic
.integer
.size
,
2146 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2147 elem_type
->u
.basic
.integer
.signedness
,
2148 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2150 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2153 elem_type
->u
.basic
.integer
.base
,
2154 #if __BYTE_ORDER == __BIG_ENDIAN
2155 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2157 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2165 /* Default encoding is UTF8 */
2166 ret
= print_tabs(session
, nesting
);
2169 ret
= lttng_metadata_printf(session
,
2171 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2172 " { encoding = ASCII; }" : "",
2176 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2178 case atype_array_compound
:
2179 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2181 case atype_sequence_compound
:
2182 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2185 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2196 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2197 struct lttng_ctx
*ctx
)
2204 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2205 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2207 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2215 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2216 struct lttng_event
*event
)
2218 const struct lttng_event_desc
*desc
= event
->desc
;
2222 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2223 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2225 ret
= _lttng_field_statedump(session
, field
, 2);
2233 * Must be called with sessions_mutex held.
2236 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2237 struct lttng_channel
*chan
,
2238 struct lttng_event
*event
)
2242 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2244 if (chan
->channel_type
== METADATA_CHANNEL
)
2247 ret
= lttng_metadata_printf(session
,
2251 " stream_id = %u;\n",
2259 ret
= lttng_metadata_printf(session
,
2260 " context := struct {\n");
2264 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2268 ret
= lttng_metadata_printf(session
,
2274 ret
= lttng_metadata_printf(session
,
2275 " fields := struct {\n"
2280 ret
= _lttng_fields_metadata_statedump(session
, event
);
2285 * LTTng space reservation can only reserve multiples of the
2288 ret
= lttng_metadata_printf(session
,
2294 event
->metadata_dumped
= 1;
2301 * Must be called with sessions_mutex held.
2304 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2305 struct lttng_channel
*chan
)
2309 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2312 if (chan
->channel_type
== METADATA_CHANNEL
)
2315 WARN_ON_ONCE(!chan
->header_type
);
2316 ret
= lttng_metadata_printf(session
,
2319 " event.header := %s;\n"
2320 " packet.context := struct packet_context;\n",
2322 chan
->header_type
== 1 ? "struct event_header_compact" :
2323 "struct event_header_large");
2328 ret
= lttng_metadata_printf(session
,
2329 " event.context := struct {\n");
2333 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2337 ret
= lttng_metadata_printf(session
,
2343 ret
= lttng_metadata_printf(session
,
2346 chan
->metadata_dumped
= 1;
2352 * Must be called with sessions_mutex held.
2355 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2357 return lttng_metadata_printf(session
,
2358 "struct packet_context {\n"
2359 " uint64_clock_monotonic_t timestamp_begin;\n"
2360 " uint64_clock_monotonic_t timestamp_end;\n"
2361 " uint64_t content_size;\n"
2362 " uint64_t packet_size;\n"
2363 " uint64_t packet_seq_num;\n"
2364 " unsigned long events_discarded;\n"
2365 " uint32_t cpu_id;\n"
2372 * id: range: 0 - 30.
2373 * id 31 is reserved to indicate an extended header.
2376 * id: range: 0 - 65534.
2377 * id 65535 is reserved to indicate an extended header.
2379 * Must be called with sessions_mutex held.
2382 int _lttng_event_header_declare(struct lttng_session
*session
)
2384 return lttng_metadata_printf(session
,
2385 "struct event_header_compact {\n"
2386 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2389 " uint27_clock_monotonic_t timestamp;\n"
2393 " uint64_clock_monotonic_t timestamp;\n"
2398 "struct event_header_large {\n"
2399 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2402 " uint32_clock_monotonic_t timestamp;\n"
2406 " uint64_clock_monotonic_t timestamp;\n"
2410 lttng_alignof(uint32_t) * CHAR_BIT
,
2411 lttng_alignof(uint16_t) * CHAR_BIT
2416 * Approximation of NTP time of day to clock monotonic correlation,
2417 * taken at start of trace.
2418 * Yes, this is only an approximation. Yes, we can (and will) do better
2419 * in future versions.
2420 * This function may return a negative offset. It may happen if the
2421 * system sets the REALTIME clock to 0 after boot.
2424 int64_t measure_clock_offset(void)
2426 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2427 uint64_t tcf
= trace_clock_freq();
2429 struct timespec rts
= { 0, 0 };
2430 unsigned long flags
;
2432 /* Disable interrupts to increase correlation precision. */
2433 local_irq_save(flags
);
2434 monotonic
[0] = trace_clock_read64();
2435 getnstimeofday(&rts
);
2436 monotonic
[1] = trace_clock_read64();
2437 local_irq_restore(flags
);
2439 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2440 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2441 if (tcf
== NSEC_PER_SEC
) {
2442 realtime
+= rts
.tv_nsec
;
2444 uint64_t n
= rts
.tv_nsec
* tcf
;
2446 do_div(n
, NSEC_PER_SEC
);
2449 offset
= (int64_t) realtime
- monotonic_avg
;
2454 * Output metadata into this session's metadata buffers.
2455 * Must be called with sessions_mutex held.
2458 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2460 unsigned char *uuid_c
= session
->uuid
.b
;
2461 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2462 struct lttng_channel
*chan
;
2463 struct lttng_event
*event
;
2466 if (!READ_ONCE(session
->active
))
2468 if (session
->metadata_dumped
)
2471 snprintf(uuid_s
, sizeof(uuid_s
),
2472 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2473 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2474 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2475 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2476 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2478 ret
= lttng_metadata_printf(session
,
2479 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2480 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2481 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2482 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2483 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2484 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2485 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2491 " byte_order = %s;\n"
2492 " packet.header := struct {\n"
2493 " uint32_t magic;\n"
2494 " uint8_t uuid[16];\n"
2495 " uint32_t stream_id;\n"
2496 " uint64_t stream_instance_id;\n"
2499 lttng_alignof(uint8_t) * CHAR_BIT
,
2500 lttng_alignof(uint16_t) * CHAR_BIT
,
2501 lttng_alignof(uint32_t) * CHAR_BIT
,
2502 lttng_alignof(uint64_t) * CHAR_BIT
,
2503 sizeof(unsigned long) * CHAR_BIT
,
2504 lttng_alignof(unsigned long) * CHAR_BIT
,
2508 #if __BYTE_ORDER == __BIG_ENDIAN
2517 ret
= lttng_metadata_printf(session
,
2519 " hostname = \"%s\";\n"
2520 " domain = \"kernel\";\n"
2521 " sysname = \"%s\";\n"
2522 " kernel_release = \"%s\";\n"
2523 " kernel_version = \"%s\";\n"
2524 " tracer_name = \"lttng-modules\";\n"
2525 " tracer_major = %d;\n"
2526 " tracer_minor = %d;\n"
2527 " tracer_patchlevel = %d;\n"
2529 current
->nsproxy
->uts_ns
->name
.nodename
,
2533 LTTNG_MODULES_MAJOR_VERSION
,
2534 LTTNG_MODULES_MINOR_VERSION
,
2535 LTTNG_MODULES_PATCHLEVEL_VERSION
2540 ret
= lttng_metadata_printf(session
,
2542 " name = \"%s\";\n",
2548 if (!trace_clock_uuid(clock_uuid_s
)) {
2549 ret
= lttng_metadata_printf(session
,
2550 " uuid = \"%s\";\n",
2557 ret
= lttng_metadata_printf(session
,
2558 " description = \"%s\";\n"
2559 " freq = %llu; /* Frequency, in Hz */\n"
2560 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2563 trace_clock_description(),
2564 (unsigned long long) trace_clock_freq(),
2565 (long long) measure_clock_offset()
2570 ret
= lttng_metadata_printf(session
,
2571 "typealias integer {\n"
2572 " size = 27; align = 1; signed = false;\n"
2573 " map = clock.%s.value;\n"
2574 "} := uint27_clock_monotonic_t;\n"
2576 "typealias integer {\n"
2577 " size = 32; align = %u; signed = false;\n"
2578 " map = clock.%s.value;\n"
2579 "} := uint32_clock_monotonic_t;\n"
2581 "typealias integer {\n"
2582 " size = 64; align = %u; signed = false;\n"
2583 " map = clock.%s.value;\n"
2584 "} := uint64_clock_monotonic_t;\n\n",
2586 lttng_alignof(uint32_t) * CHAR_BIT
,
2588 lttng_alignof(uint64_t) * CHAR_BIT
,
2594 ret
= _lttng_stream_packet_context_declare(session
);
2598 ret
= _lttng_event_header_declare(session
);
2603 list_for_each_entry(chan
, &session
->chan
, list
) {
2604 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2609 list_for_each_entry(event
, &session
->events
, list
) {
2610 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2614 session
->metadata_dumped
= 1;
2620 * lttng_transport_register - LTT transport registration
2621 * @transport: transport structure
2623 * Registers a transport which can be used as output to extract the data out of
2624 * LTTng. The module calling this registration function must ensure that no
2625 * trap-inducing code will be executed by the transport functions. E.g.
2626 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2627 * is made visible to the transport function. This registration acts as a
2628 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2629 * after its registration must it synchronize the TLBs.
2631 void lttng_transport_register(struct lttng_transport
*transport
)
2634 * Make sure no page fault can be triggered by the module about to be
2635 * registered. We deal with this here so we don't have to call
2636 * vmalloc_sync_all() in each module's init.
2638 wrapper_vmalloc_sync_all();
2640 mutex_lock(&sessions_mutex
);
2641 list_add_tail(&transport
->node
, <tng_transport_list
);
2642 mutex_unlock(&sessions_mutex
);
2644 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2647 * lttng_transport_unregister - LTT transport unregistration
2648 * @transport: transport structure
2650 void lttng_transport_unregister(struct lttng_transport
*transport
)
2652 mutex_lock(&sessions_mutex
);
2653 list_del(&transport
->node
);
2654 mutex_unlock(&sessions_mutex
);
2656 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2658 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2660 enum cpuhp_state lttng_hp_prepare
;
2661 enum cpuhp_state lttng_hp_online
;
2663 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2665 struct lttng_cpuhp_node
*lttng_node
;
2667 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2668 switch (lttng_node
->component
) {
2669 case LTTNG_RING_BUFFER_FRONTEND
:
2671 case LTTNG_RING_BUFFER_BACKEND
:
2672 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2673 case LTTNG_RING_BUFFER_ITER
:
2675 case LTTNG_CONTEXT_PERF_COUNTERS
:
2682 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2684 struct lttng_cpuhp_node
*lttng_node
;
2686 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2687 switch (lttng_node
->component
) {
2688 case LTTNG_RING_BUFFER_FRONTEND
:
2689 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2690 case LTTNG_RING_BUFFER_BACKEND
:
2692 case LTTNG_RING_BUFFER_ITER
:
2694 case LTTNG_CONTEXT_PERF_COUNTERS
:
2695 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2701 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2703 struct lttng_cpuhp_node
*lttng_node
;
2705 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2706 switch (lttng_node
->component
) {
2707 case LTTNG_RING_BUFFER_FRONTEND
:
2708 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2709 case LTTNG_RING_BUFFER_BACKEND
:
2711 case LTTNG_RING_BUFFER_ITER
:
2712 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2713 case LTTNG_CONTEXT_PERF_COUNTERS
:
2714 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2720 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2722 struct lttng_cpuhp_node
*lttng_node
;
2724 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2725 switch (lttng_node
->component
) {
2726 case LTTNG_RING_BUFFER_FRONTEND
:
2727 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2728 case LTTNG_RING_BUFFER_BACKEND
:
2730 case LTTNG_RING_BUFFER_ITER
:
2732 case LTTNG_CONTEXT_PERF_COUNTERS
:
2739 static int __init
lttng_init_cpu_hotplug(void)
2743 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2744 lttng_hotplug_prepare
,
2745 lttng_hotplug_dead
);
2749 lttng_hp_prepare
= ret
;
2750 lttng_rb_set_hp_prepare(ret
);
2752 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2753 lttng_hotplug_online
,
2754 lttng_hotplug_offline
);
2756 cpuhp_remove_multi_state(lttng_hp_prepare
);
2757 lttng_hp_prepare
= 0;
2760 lttng_hp_online
= ret
;
2761 lttng_rb_set_hp_online(ret
);
2766 static void __exit
lttng_exit_cpu_hotplug(void)
2768 lttng_rb_set_hp_online(0);
2769 cpuhp_remove_multi_state(lttng_hp_online
);
2770 lttng_rb_set_hp_prepare(0);
2771 cpuhp_remove_multi_state(lttng_hp_prepare
);
2774 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2775 static int lttng_init_cpu_hotplug(void)
2779 static void lttng_exit_cpu_hotplug(void)
2782 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2785 static int __init
lttng_events_init(void)
2789 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2792 ret
= wrapper_get_pfnblock_flags_mask_init();
2795 ret
= wrapper_get_pageblock_flags_mask_init();
2798 ret
= lttng_probes_init();
2801 ret
= lttng_context_init();
2804 ret
= lttng_tracepoint_init();
2807 event_cache
= KMEM_CACHE(lttng_event
, 0);
2812 ret
= lttng_abi_init();
2815 ret
= lttng_logger_init();
2818 ret
= lttng_init_cpu_hotplug();
2821 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2822 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2823 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2824 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2825 LTTNG_MODULES_EXTRAVERSION
,
2827 #ifdef LTTNG_EXTRA_VERSION_GIT
2828 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2832 #ifdef LTTNG_EXTRA_VERSION_NAME
2833 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2840 lttng_logger_exit();
2844 kmem_cache_destroy(event_cache
);
2846 lttng_tracepoint_exit();
2848 lttng_context_exit();
2849 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2850 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2851 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2852 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2853 LTTNG_MODULES_EXTRAVERSION
,
2855 #ifdef LTTNG_EXTRA_VERSION_GIT
2856 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2860 #ifdef LTTNG_EXTRA_VERSION_NAME
2861 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2868 module_init(lttng_events_init
);
2870 static void __exit
lttng_events_exit(void)
2872 struct lttng_session
*session
, *tmpsession
;
2874 lttng_exit_cpu_hotplug();
2875 lttng_logger_exit();
2877 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2878 lttng_session_destroy(session
);
2879 kmem_cache_destroy(event_cache
);
2880 lttng_tracepoint_exit();
2881 lttng_context_exit();
2882 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2883 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2884 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2885 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2886 LTTNG_MODULES_EXTRAVERSION
,
2888 #ifdef LTTNG_EXTRA_VERSION_GIT
2889 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2893 #ifdef LTTNG_EXTRA_VERSION_NAME
2894 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2900 module_exit(lttng_events_exit
);
2902 #include "extra_version/patches.i"
2903 #ifdef LTTNG_EXTRA_VERSION_GIT
2904 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
2906 #ifdef LTTNG_EXTRA_VERSION_NAME
2907 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
2909 MODULE_LICENSE("GPL and additional rights");
2910 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2911 MODULE_DESCRIPTION("LTTng tracer");
2912 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
2913 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
2914 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
2915 LTTNG_MODULES_EXTRAVERSION
);