1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/jiffies.h>
15 #include <linux/utsname.h>
16 #include <linux/err.h>
17 #include <linux/seq_file.h>
18 #include <linux/file.h>
19 #include <linux/anon_inodes.h>
20 #include <linux/jhash.h>
21 #include <linux/uaccess.h>
22 #include <linux/uuid.h>
23 #include <linux/dmi.h>
24 #include <linux/vmalloc.h>
25 #include <linux/limits.h>
27 #include <wrapper/random.h>
28 #include <lttng-kernel-version.h>
29 #include <lttng-events.h>
30 #include <lttng-tracer.h>
31 #include <lttng-abi-old.h>
32 #include <lttng-endian.h>
33 #include <lttng-string-utils.h>
34 #include <lttng-tracepoint.h>
35 #include <wrapper/ringbuffer/backend.h>
36 #include <wrapper/ringbuffer/frontend.h>
38 #define METADATA_CACHE_DEFAULT_SIZE 4096
40 static LIST_HEAD(sessions
);
41 static LIST_HEAD(lttng_transport_list
);
43 * Protect the sessions and metadata caches.
45 static DEFINE_MUTEX(sessions_mutex
);
46 static struct kmem_cache
*event_cache
;
48 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
49 static void lttng_session_sync_enablers(struct lttng_session
*session
);
50 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
52 static void _lttng_event_destroy(struct lttng_event
*event
);
53 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
54 static int _lttng_event_unregister(struct lttng_event
*event
);
56 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
57 struct lttng_channel
*chan
,
58 struct lttng_event
*event
);
60 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
62 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
64 int _lttng_type_statedump(struct lttng_session
*session
,
65 const struct lttng_type
*type
,
68 int _lttng_field_statedump(struct lttng_session
*session
,
69 const struct lttng_event_field
*field
,
72 void synchronize_trace(void)
77 void lttng_lock_sessions(void)
79 mutex_lock(&sessions_mutex
);
82 void lttng_unlock_sessions(void)
84 mutex_unlock(&sessions_mutex
);
88 * Called with sessions lock held.
90 int lttng_session_active(void)
92 struct lttng_session
*iter
;
94 list_for_each_entry(iter
, &sessions
, list
) {
101 struct lttng_session
*lttng_session_create(void)
103 struct lttng_session
*session
;
104 struct lttng_metadata_cache
*metadata_cache
;
107 mutex_lock(&sessions_mutex
);
108 session
= kvzalloc_node(sizeof(struct lttng_session
), GFP_KERNEL
,
112 INIT_LIST_HEAD(&session
->chan
);
113 INIT_LIST_HEAD(&session
->events
);
114 guid_gen(&session
->uuid
);
116 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
119 goto err_free_session
;
120 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
121 if (!metadata_cache
->data
)
123 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
124 kref_init(&metadata_cache
->refcount
);
125 mutex_init(&metadata_cache
->lock
);
126 session
->metadata_cache
= metadata_cache
;
127 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
128 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
129 sizeof(metadata_cache
->uuid
));
130 INIT_LIST_HEAD(&session
->enablers_head
);
131 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
132 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
133 list_add(&session
->list
, &sessions
);
134 session
->pid_tracker
.session
= session
;
135 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
136 session
->vpid_tracker
.session
= session
;
137 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
138 session
->uid_tracker
.session
= session
;
139 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
140 session
->vuid_tracker
.session
= session
;
141 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
142 session
->gid_tracker
.session
= session
;
143 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
144 session
->vgid_tracker
.session
= session
;
145 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
146 mutex_unlock(&sessions_mutex
);
150 kfree(metadata_cache
);
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 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
197 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
198 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
199 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
200 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
201 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
202 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
203 list_del(&session
->list
);
204 mutex_unlock(&sessions_mutex
);
208 int lttng_session_statedump(struct lttng_session
*session
)
212 mutex_lock(&sessions_mutex
);
213 ret
= lttng_statedump_start(session
);
214 mutex_unlock(&sessions_mutex
);
218 int lttng_session_enable(struct lttng_session
*session
)
221 struct lttng_channel
*chan
;
223 mutex_lock(&sessions_mutex
);
224 if (session
->active
) {
229 /* Set transient enabler state to "enabled" */
232 /* We need to sync enablers with session before activation. */
233 lttng_session_sync_enablers(session
);
236 * Snapshot the number of events per channel to know the type of header
239 list_for_each_entry(chan
, &session
->chan
, list
) {
240 if (chan
->header_type
)
241 continue; /* don't change it if session stop/restart */
242 if (chan
->free_event_id
< 31)
243 chan
->header_type
= 1; /* compact */
245 chan
->header_type
= 2; /* large */
248 /* Clear each stream's quiescent state. */
249 list_for_each_entry(chan
, &session
->chan
, list
) {
250 if (chan
->channel_type
!= METADATA_CHANNEL
)
251 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
254 WRITE_ONCE(session
->active
, 1);
255 WRITE_ONCE(session
->been_active
, 1);
256 ret
= _lttng_session_metadata_statedump(session
);
258 WRITE_ONCE(session
->active
, 0);
261 ret
= lttng_statedump_start(session
);
263 WRITE_ONCE(session
->active
, 0);
265 mutex_unlock(&sessions_mutex
);
269 int lttng_session_disable(struct lttng_session
*session
)
272 struct lttng_channel
*chan
;
274 mutex_lock(&sessions_mutex
);
275 if (!session
->active
) {
279 WRITE_ONCE(session
->active
, 0);
281 /* Set transient enabler state to "disabled" */
283 lttng_session_sync_enablers(session
);
285 /* Set each stream's quiescent state. */
286 list_for_each_entry(chan
, &session
->chan
, list
) {
287 if (chan
->channel_type
!= METADATA_CHANNEL
)
288 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
291 mutex_unlock(&sessions_mutex
);
295 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
298 struct lttng_channel
*chan
;
299 struct lttng_event
*event
;
300 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
301 struct lttng_metadata_stream
*stream
;
303 mutex_lock(&sessions_mutex
);
304 if (!session
->active
) {
309 mutex_lock(&cache
->lock
);
310 memset(cache
->data
, 0, cache
->cache_alloc
);
311 cache
->metadata_written
= 0;
313 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
314 stream
->metadata_out
= 0;
315 stream
->metadata_in
= 0;
317 mutex_unlock(&cache
->lock
);
319 session
->metadata_dumped
= 0;
320 list_for_each_entry(chan
, &session
->chan
, list
) {
321 chan
->metadata_dumped
= 0;
324 list_for_each_entry(event
, &session
->events
, list
) {
325 event
->metadata_dumped
= 0;
328 ret
= _lttng_session_metadata_statedump(session
);
331 mutex_unlock(&sessions_mutex
);
335 int lttng_channel_enable(struct lttng_channel
*channel
)
339 mutex_lock(&sessions_mutex
);
340 if (channel
->channel_type
== METADATA_CHANNEL
) {
344 if (channel
->enabled
) {
348 /* Set transient enabler state to "enabled" */
350 lttng_session_sync_enablers(channel
->session
);
351 /* Set atomically the state to "enabled" */
352 WRITE_ONCE(channel
->enabled
, 1);
354 mutex_unlock(&sessions_mutex
);
358 int lttng_channel_disable(struct lttng_channel
*channel
)
362 mutex_lock(&sessions_mutex
);
363 if (channel
->channel_type
== METADATA_CHANNEL
) {
367 if (!channel
->enabled
) {
371 /* Set atomically the state to "disabled" */
372 WRITE_ONCE(channel
->enabled
, 0);
373 /* Set transient enabler state to "enabled" */
375 lttng_session_sync_enablers(channel
->session
);
377 mutex_unlock(&sessions_mutex
);
381 int lttng_event_enable(struct lttng_event
*event
)
385 mutex_lock(&sessions_mutex
);
386 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
390 if (event
->enabled
) {
394 switch (event
->instrumentation
) {
395 case LTTNG_KERNEL_TRACEPOINT
:
396 case LTTNG_KERNEL_SYSCALL
:
399 case LTTNG_KERNEL_KPROBE
:
400 case LTTNG_KERNEL_UPROBE
:
401 case LTTNG_KERNEL_NOOP
:
402 WRITE_ONCE(event
->enabled
, 1);
404 case LTTNG_KERNEL_KRETPROBE
:
405 ret
= lttng_kretprobes_event_enable_state(event
, 1);
407 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
413 mutex_unlock(&sessions_mutex
);
417 int lttng_event_disable(struct lttng_event
*event
)
421 mutex_lock(&sessions_mutex
);
422 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
426 if (!event
->enabled
) {
430 switch (event
->instrumentation
) {
431 case LTTNG_KERNEL_TRACEPOINT
:
432 case LTTNG_KERNEL_SYSCALL
:
435 case LTTNG_KERNEL_KPROBE
:
436 case LTTNG_KERNEL_UPROBE
:
437 case LTTNG_KERNEL_NOOP
:
438 WRITE_ONCE(event
->enabled
, 0);
440 case LTTNG_KERNEL_KRETPROBE
:
441 ret
= lttng_kretprobes_event_enable_state(event
, 0);
443 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
449 mutex_unlock(&sessions_mutex
);
453 static struct lttng_transport
*lttng_transport_find(const char *name
)
455 struct lttng_transport
*transport
;
457 list_for_each_entry(transport
, <tng_transport_list
, node
) {
458 if (!strcmp(transport
->name
, name
))
464 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
465 const char *transport_name
,
467 size_t subbuf_size
, size_t num_subbuf
,
468 unsigned int switch_timer_interval
,
469 unsigned int read_timer_interval
,
470 enum channel_type channel_type
)
472 struct lttng_channel
*chan
;
473 struct lttng_transport
*transport
= NULL
;
475 mutex_lock(&sessions_mutex
);
476 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
477 goto active
; /* Refuse to add channel to active session */
478 transport
= lttng_transport_find(transport_name
);
480 printk(KERN_WARNING
"LTTng transport %s not found\n",
484 if (!try_module_get(transport
->owner
)) {
485 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
488 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
491 chan
->session
= session
;
492 chan
->id
= session
->free_chan_id
++;
493 chan
->ops
= &transport
->ops
;
495 * Note: the channel creation op already writes into the packet
496 * headers. Therefore the "chan" information used as input
497 * should be already accessible.
499 chan
->chan
= transport
->ops
.channel_create(transport_name
,
500 chan
, buf_addr
, subbuf_size
, num_subbuf
,
501 switch_timer_interval
, read_timer_interval
);
506 chan
->transport
= transport
;
507 chan
->channel_type
= channel_type
;
508 list_add(&chan
->list
, &session
->chan
);
509 mutex_unlock(&sessions_mutex
);
516 module_put(transport
->owner
);
519 mutex_unlock(&sessions_mutex
);
524 * Only used internally at session destruction for per-cpu channels, and
525 * when metadata channel is released.
526 * Needs to be called with sessions mutex held.
529 void _lttng_channel_destroy(struct lttng_channel
*chan
)
531 chan
->ops
->channel_destroy(chan
->chan
);
532 module_put(chan
->transport
->owner
);
533 list_del(&chan
->list
);
534 lttng_destroy_context(chan
->ctx
);
538 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
540 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
542 /* Protect the metadata cache with the sessions_mutex. */
543 mutex_lock(&sessions_mutex
);
544 _lttng_channel_destroy(chan
);
545 mutex_unlock(&sessions_mutex
);
547 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
550 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
552 stream
->finalized
= 1;
553 wake_up_interruptible(&stream
->read_wait
);
557 * Supports event creation while tracing session is active.
558 * Needs to be called with sessions mutex held.
560 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
561 struct lttng_kernel_event
*event_param
,
563 const struct lttng_event_desc
*event_desc
,
564 enum lttng_kernel_instrumentation itype
)
566 struct lttng_session
*session
= chan
->session
;
567 struct lttng_event
*event
;
568 const char *event_name
;
569 struct hlist_head
*head
;
574 if (chan
->free_event_id
== -1U) {
580 case LTTNG_KERNEL_TRACEPOINT
:
581 event_name
= event_desc
->name
;
583 case LTTNG_KERNEL_KPROBE
:
584 case LTTNG_KERNEL_UPROBE
:
585 case LTTNG_KERNEL_KRETPROBE
:
586 case LTTNG_KERNEL_NOOP
:
587 case LTTNG_KERNEL_SYSCALL
:
588 event_name
= event_param
->name
;
590 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
596 name_len
= strlen(event_name
);
597 hash
= jhash(event_name
, name_len
, 0);
598 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
599 hlist_for_each_entry(event
, head
, hlist
) {
600 WARN_ON_ONCE(!event
->desc
);
601 if (!strncmp(event
->desc
->name
, event_name
,
602 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
603 && chan
== event
->chan
) {
609 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
615 event
->filter
= filter
;
616 event
->id
= chan
->free_event_id
++;
617 event
->instrumentation
= itype
;
618 event
->evtype
= LTTNG_TYPE_EVENT
;
619 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
620 INIT_LIST_HEAD(&event
->enablers_ref_head
);
623 case LTTNG_KERNEL_TRACEPOINT
:
624 /* Event will be enabled by enabler sync. */
626 event
->registered
= 0;
627 event
->desc
= lttng_event_get(event_name
);
632 /* Populate lttng_event structure before event registration. */
635 case LTTNG_KERNEL_KPROBE
:
637 * Needs to be explicitly enabled after creation, since
638 * we may want to apply filters.
641 event
->registered
= 1;
643 * Populate lttng_event structure before event
647 ret
= lttng_kprobes_register(event_name
,
648 event_param
->u
.kprobe
.symbol_name
,
649 event_param
->u
.kprobe
.offset
,
650 event_param
->u
.kprobe
.addr
,
656 ret
= try_module_get(event
->desc
->owner
);
659 case LTTNG_KERNEL_KRETPROBE
:
661 struct lttng_event
*event_return
;
663 /* kretprobe defines 2 events */
665 * Needs to be explicitly enabled after creation, since
666 * we may want to apply filters.
669 event
->registered
= 1;
671 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
676 event_return
->chan
= chan
;
677 event_return
->filter
= filter
;
678 event_return
->id
= chan
->free_event_id
++;
679 event_return
->enabled
= 0;
680 event_return
->registered
= 1;
681 event_return
->instrumentation
= itype
;
683 * Populate lttng_event structure before kretprobe registration.
686 ret
= lttng_kretprobes_register(event_name
,
687 event_param
->u
.kretprobe
.symbol_name
,
688 event_param
->u
.kretprobe
.offset
,
689 event_param
->u
.kretprobe
.addr
,
690 event
, event_return
);
692 kmem_cache_free(event_cache
, event_return
);
696 /* Take 2 refs on the module: one per event. */
697 ret
= try_module_get(event
->desc
->owner
);
699 ret
= try_module_get(event
->desc
->owner
);
701 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
703 WARN_ON_ONCE(ret
> 0);
705 kmem_cache_free(event_cache
, event_return
);
706 module_put(event
->desc
->owner
);
707 module_put(event
->desc
->owner
);
708 goto statedump_error
;
710 list_add(&event_return
->list
, &chan
->session
->events
);
713 case LTTNG_KERNEL_NOOP
:
714 case LTTNG_KERNEL_SYSCALL
:
716 * Needs to be explicitly enabled after creation, since
717 * we may want to apply filters.
720 event
->registered
= 0;
721 event
->desc
= event_desc
;
727 case LTTNG_KERNEL_UPROBE
:
729 * Needs to be explicitly enabled after creation, since
730 * we may want to apply filters.
733 event
->registered
= 1;
736 * Populate lttng_event structure before event
741 ret
= lttng_uprobes_register(event_param
->name
,
742 event_param
->u
.uprobe
.fd
,
746 ret
= try_module_get(event
->desc
->owner
);
749 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
755 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
756 WARN_ON_ONCE(ret
> 0);
758 goto statedump_error
;
760 hlist_add_head(&event
->hlist
, head
);
761 list_add(&event
->list
, &chan
->session
->events
);
765 /* If a statedump error occurs, events will not be readable. */
767 kmem_cache_free(event_cache
, event
);
775 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
776 struct lttng_kernel_event
*event_param
,
778 const struct lttng_event_desc
*event_desc
,
779 enum lttng_kernel_instrumentation itype
)
781 struct lttng_event
*event
;
783 mutex_lock(&sessions_mutex
);
784 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
786 mutex_unlock(&sessions_mutex
);
790 /* Only used for tracepoints for now. */
792 void register_event(struct lttng_event
*event
)
794 const struct lttng_event_desc
*desc
;
797 if (event
->registered
)
801 switch (event
->instrumentation
) {
802 case LTTNG_KERNEL_TRACEPOINT
:
803 ret
= lttng_tracepoint_probe_register(desc
->kname
,
804 desc
->probe_callback
,
807 case LTTNG_KERNEL_SYSCALL
:
808 ret
= lttng_syscall_filter_enable(event
->chan
,
811 case LTTNG_KERNEL_KPROBE
:
812 case LTTNG_KERNEL_UPROBE
:
813 case LTTNG_KERNEL_KRETPROBE
:
814 case LTTNG_KERNEL_NOOP
:
817 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
822 event
->registered
= 1;
826 * Only used internally at session destruction.
828 int _lttng_event_unregister(struct lttng_event
*event
)
830 const struct lttng_event_desc
*desc
;
833 if (!event
->registered
)
837 switch (event
->instrumentation
) {
838 case LTTNG_KERNEL_TRACEPOINT
:
839 ret
= lttng_tracepoint_probe_unregister(event
->desc
->kname
,
840 event
->desc
->probe_callback
,
843 case LTTNG_KERNEL_KPROBE
:
844 lttng_kprobes_unregister(event
);
847 case LTTNG_KERNEL_KRETPROBE
:
848 lttng_kretprobes_unregister(event
);
851 case LTTNG_KERNEL_SYSCALL
:
852 ret
= lttng_syscall_filter_disable(event
->chan
,
855 case LTTNG_KERNEL_NOOP
:
858 case LTTNG_KERNEL_UPROBE
:
859 lttng_uprobes_unregister(event
);
862 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
867 event
->registered
= 0;
872 * Only used internally at session destruction.
875 void _lttng_event_destroy(struct lttng_event
*event
)
877 switch (event
->instrumentation
) {
878 case LTTNG_KERNEL_TRACEPOINT
:
879 lttng_event_put(event
->desc
);
881 case LTTNG_KERNEL_KPROBE
:
882 module_put(event
->desc
->owner
);
883 lttng_kprobes_destroy_private(event
);
885 case LTTNG_KERNEL_KRETPROBE
:
886 module_put(event
->desc
->owner
);
887 lttng_kretprobes_destroy_private(event
);
889 case LTTNG_KERNEL_NOOP
:
890 case LTTNG_KERNEL_SYSCALL
:
892 case LTTNG_KERNEL_UPROBE
:
893 module_put(event
->desc
->owner
);
894 lttng_uprobes_destroy_private(event
);
896 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
900 list_del(&event
->list
);
901 lttng_destroy_context(event
->ctx
);
902 kmem_cache_free(event_cache
, event
);
905 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
906 enum tracker_type tracker_type
)
908 switch (tracker_type
) {
910 return &session
->pid_tracker
;
912 return &session
->vpid_tracker
;
914 return &session
->uid_tracker
;
916 return &session
->vuid_tracker
;
918 return &session
->gid_tracker
;
920 return &session
->vgid_tracker
;
927 int lttng_session_track_id(struct lttng_session
*session
,
928 enum tracker_type tracker_type
, int id
)
930 struct lttng_id_tracker
*tracker
;
933 tracker
= get_tracker(session
, tracker_type
);
938 mutex_lock(&sessions_mutex
);
940 /* track all ids: destroy tracker. */
941 lttng_id_tracker_destroy(tracker
, true);
944 ret
= lttng_id_tracker_add(tracker
, id
);
946 mutex_unlock(&sessions_mutex
);
950 int lttng_session_untrack_id(struct lttng_session
*session
,
951 enum tracker_type tracker_type
, int id
)
953 struct lttng_id_tracker
*tracker
;
956 tracker
= get_tracker(session
, tracker_type
);
961 mutex_lock(&sessions_mutex
);
963 /* untrack all ids: replace by empty tracker. */
964 ret
= lttng_id_tracker_empty_set(tracker
);
966 ret
= lttng_id_tracker_del(tracker
, id
);
968 mutex_unlock(&sessions_mutex
);
973 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
975 struct lttng_id_tracker
*id_tracker
= m
->private;
976 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
977 struct lttng_id_hash_node
*e
;
980 mutex_lock(&sessions_mutex
);
982 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
983 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
985 hlist_for_each_entry(e
, head
, hlist
) {
991 /* ID tracker disabled. */
992 if (iter
>= *pos
&& iter
== 0) {
993 return id_tracker_p
; /* empty tracker */
1001 /* Called with sessions_mutex held. */
1003 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1005 struct lttng_id_tracker
*id_tracker
= m
->private;
1006 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1007 struct lttng_id_hash_node
*e
;
1012 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1013 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1015 hlist_for_each_entry(e
, head
, hlist
) {
1016 if (iter
++ >= *ppos
)
1021 /* ID tracker disabled. */
1022 if (iter
>= *ppos
&& iter
== 0)
1023 return p
; /* empty tracker */
1032 void id_list_stop(struct seq_file
*m
, void *p
)
1034 mutex_unlock(&sessions_mutex
);
1038 int id_list_show(struct seq_file
*m
, void *p
)
1040 struct lttng_id_tracker
*id_tracker
= m
->private;
1041 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1044 if (p
== id_tracker_p
) {
1045 /* Tracker disabled. */
1048 const struct lttng_id_hash_node
*e
= p
;
1050 id
= lttng_id_tracker_get_node_id(e
);
1052 switch (id_tracker
->tracker_type
) {
1054 seq_printf(m
, "process { pid = %d; };\n", id
);
1057 seq_printf(m
, "process { vpid = %d; };\n", id
);
1060 seq_printf(m
, "user { uid = %d; };\n", id
);
1063 seq_printf(m
, "user { vuid = %d; };\n", id
);
1066 seq_printf(m
, "group { gid = %d; };\n", id
);
1069 seq_printf(m
, "group { vgid = %d; };\n", id
);
1072 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1078 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1079 .start
= id_list_start
,
1080 .next
= id_list_next
,
1081 .stop
= id_list_stop
,
1082 .show
= id_list_show
,
1086 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1088 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1092 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1094 struct seq_file
*m
= file
->private_data
;
1095 struct lttng_id_tracker
*id_tracker
= m
->private;
1098 WARN_ON_ONCE(!id_tracker
);
1099 ret
= seq_release(inode
, file
);
1101 fput(id_tracker
->session
->file
);
1105 const struct file_operations lttng_tracker_ids_list_fops
= {
1106 .owner
= THIS_MODULE
,
1107 .open
= lttng_tracker_ids_list_open
,
1109 .llseek
= seq_lseek
,
1110 .release
= lttng_tracker_ids_list_release
,
1113 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1114 enum tracker_type tracker_type
)
1116 struct file
*tracker_ids_list_file
;
1120 file_fd
= get_unused_fd_flags(0);
1126 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1127 <tng_tracker_ids_list_fops
,
1129 if (IS_ERR(tracker_ids_list_file
)) {
1130 ret
= PTR_ERR(tracker_ids_list_file
);
1133 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1135 goto refcount_error
;
1137 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1140 m
= tracker_ids_list_file
->private_data
;
1142 m
->private = get_tracker(session
, tracker_type
);
1143 BUG_ON(!m
->private);
1144 fd_install(file_fd
, tracker_ids_list_file
);
1149 atomic_long_dec(&session
->file
->f_count
);
1151 fput(tracker_ids_list_file
);
1153 put_unused_fd(file_fd
);
1159 * Enabler management.
1162 int lttng_match_enabler_star_glob(const char *desc_name
,
1163 const char *pattern
)
1165 if (!strutils_star_glob_match(pattern
, SIZE_MAX
,
1166 desc_name
, SIZE_MAX
))
1172 int lttng_match_enabler_name(const char *desc_name
,
1175 if (strcmp(desc_name
, name
))
1181 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1182 struct lttng_enabler
*enabler
)
1184 const char *desc_name
, *enabler_name
;
1186 enabler_name
= enabler
->event_param
.name
;
1187 switch (enabler
->event_param
.instrumentation
) {
1188 case LTTNG_KERNEL_TRACEPOINT
:
1189 desc_name
= desc
->name
;
1191 case LTTNG_KERNEL_SYSCALL
:
1192 desc_name
= desc
->name
;
1193 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1194 desc_name
+= strlen("compat_");
1195 if (!strncmp(desc_name
, "syscall_exit_",
1196 strlen("syscall_exit_"))) {
1197 desc_name
+= strlen("syscall_exit_");
1198 } else if (!strncmp(desc_name
, "syscall_entry_",
1199 strlen("syscall_entry_"))) {
1200 desc_name
+= strlen("syscall_entry_");
1210 switch (enabler
->type
) {
1211 case LTTNG_ENABLER_STAR_GLOB
:
1212 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1213 case LTTNG_ENABLER_NAME
:
1214 return lttng_match_enabler_name(desc_name
, enabler_name
);
1221 int lttng_event_match_enabler(struct lttng_event
*event
,
1222 struct lttng_enabler
*enabler
)
1224 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1226 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1227 && event
->chan
== enabler
->chan
)
1234 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1235 struct lttng_enabler
*enabler
)
1237 struct lttng_enabler_ref
*enabler_ref
;
1239 list_for_each_entry(enabler_ref
,
1240 &event
->enablers_ref_head
, node
) {
1241 if (enabler_ref
->ref
== enabler
)
1248 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1250 struct lttng_session
*session
= enabler
->chan
->session
;
1251 struct lttng_probe_desc
*probe_desc
;
1252 const struct lttng_event_desc
*desc
;
1254 struct list_head
*probe_list
;
1256 probe_list
= lttng_get_probe_list_head();
1258 * For each probe event, if we find that a probe event matches
1259 * our enabler, create an associated lttng_event if not
1262 list_for_each_entry(probe_desc
, probe_list
, head
) {
1263 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1265 struct hlist_head
*head
;
1266 const char *event_name
;
1269 struct lttng_event
*event
;
1271 desc
= probe_desc
->event_desc
[i
];
1272 if (!lttng_desc_match_enabler(desc
, enabler
))
1274 event_name
= desc
->name
;
1275 name_len
= strlen(event_name
);
1278 * Check if already created.
1280 hash
= jhash(event_name
, name_len
, 0);
1281 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1282 hlist_for_each_entry(event
, head
, hlist
) {
1283 if (event
->desc
== desc
1284 && event
->chan
== enabler
->chan
)
1291 * We need to create an event for this
1294 event
= _lttng_event_create(enabler
->chan
,
1296 LTTNG_KERNEL_TRACEPOINT
);
1298 printk(KERN_INFO
"Unable to create event %s\n",
1299 probe_desc
->event_desc
[i
]->name
);
1306 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1310 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1315 * Create struct lttng_event if it is missing and present in the list of
1316 * tracepoint probes.
1317 * Should be called with sessions mutex held.
1320 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1322 switch (enabler
->event_param
.instrumentation
) {
1323 case LTTNG_KERNEL_TRACEPOINT
:
1324 lttng_create_tracepoint_if_missing(enabler
);
1326 case LTTNG_KERNEL_SYSCALL
:
1327 lttng_create_syscall_if_missing(enabler
);
1336 * Create events associated with an enabler (if not already present),
1337 * and add backward reference from the event to the enabler.
1338 * Should be called with sessions mutex held.
1341 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1343 struct lttng_session
*session
= enabler
->chan
->session
;
1344 struct lttng_event
*event
;
1346 /* First ensure that probe events are created for this enabler. */
1347 lttng_create_event_if_missing(enabler
);
1349 /* For each event matching enabler in session event list. */
1350 list_for_each_entry(event
, &session
->events
, list
) {
1351 struct lttng_enabler_ref
*enabler_ref
;
1353 if (!lttng_event_match_enabler(event
, enabler
))
1355 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1358 * If no backward ref, create it.
1359 * Add backward ref from event to enabler.
1361 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1364 enabler_ref
->ref
= enabler
;
1365 list_add(&enabler_ref
->node
,
1366 &event
->enablers_ref_head
);
1370 * Link filter bytecodes if not linked yet.
1372 lttng_enabler_event_link_bytecode(event
, enabler
);
1374 /* TODO: merge event context. */
1380 * Called at module load: connect the probe on all enablers matching
1382 * Called with sessions lock held.
1384 int lttng_fix_pending_events(void)
1386 struct lttng_session
*session
;
1388 list_for_each_entry(session
, &sessions
, list
)
1389 lttng_session_lazy_sync_enablers(session
);
1393 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1394 struct lttng_kernel_event
*event_param
,
1395 struct lttng_channel
*chan
)
1397 struct lttng_enabler
*enabler
;
1399 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1402 enabler
->type
= type
;
1403 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1404 memcpy(&enabler
->event_param
, event_param
,
1405 sizeof(enabler
->event_param
));
1406 enabler
->chan
= chan
;
1408 enabler
->enabled
= 0;
1409 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1410 mutex_lock(&sessions_mutex
);
1411 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1412 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1413 mutex_unlock(&sessions_mutex
);
1417 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1419 mutex_lock(&sessions_mutex
);
1420 enabler
->enabled
= 1;
1421 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1422 mutex_unlock(&sessions_mutex
);
1426 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1428 mutex_lock(&sessions_mutex
);
1429 enabler
->enabled
= 0;
1430 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1431 mutex_unlock(&sessions_mutex
);
1435 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1436 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1438 struct lttng_filter_bytecode_node
*bytecode_node
;
1439 uint32_t bytecode_len
;
1442 ret
= get_user(bytecode_len
, &bytecode
->len
);
1445 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1449 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1450 sizeof(*bytecode
) + bytecode_len
);
1453 bytecode_node
->enabler
= enabler
;
1454 /* Enforce length based on allocated size */
1455 bytecode_node
->bc
.len
= bytecode_len
;
1456 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1457 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1461 kfree(bytecode_node
);
1465 int lttng_event_add_callsite(struct lttng_event
*event
,
1466 struct lttng_kernel_event_callsite __user
*callsite
)
1469 switch (event
->instrumentation
) {
1470 case LTTNG_KERNEL_UPROBE
:
1471 return lttng_uprobes_add_callsite(event
, callsite
);
1477 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1478 struct lttng_kernel_context
*context_param
)
1484 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1486 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1488 /* Destroy filter bytecode */
1489 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1490 &enabler
->filter_bytecode_head
, node
) {
1494 /* Destroy contexts */
1495 lttng_destroy_context(enabler
->ctx
);
1497 list_del(&enabler
->node
);
1502 * lttng_session_sync_enablers should be called just before starting a
1504 * Should be called with sessions mutex held.
1507 void lttng_session_sync_enablers(struct lttng_session
*session
)
1509 struct lttng_enabler
*enabler
;
1510 struct lttng_event
*event
;
1512 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1513 lttng_enabler_ref_events(enabler
);
1515 * For each event, if at least one of its enablers is enabled,
1516 * and its channel and session transient states are enabled, we
1517 * enable the event, else we disable it.
1519 list_for_each_entry(event
, &session
->events
, list
) {
1520 struct lttng_enabler_ref
*enabler_ref
;
1521 struct lttng_bytecode_runtime
*runtime
;
1522 int enabled
= 0, has_enablers_without_bytecode
= 0;
1524 switch (event
->instrumentation
) {
1525 case LTTNG_KERNEL_TRACEPOINT
:
1526 case LTTNG_KERNEL_SYSCALL
:
1528 list_for_each_entry(enabler_ref
,
1529 &event
->enablers_ref_head
, node
) {
1530 if (enabler_ref
->ref
->enabled
) {
1537 /* Not handled with lazy sync. */
1541 * Enabled state is based on union of enablers, with
1542 * intesection of session and channel transient enable
1545 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1547 WRITE_ONCE(event
->enabled
, enabled
);
1549 * Sync tracepoint registration with event enabled
1553 register_event(event
);
1555 _lttng_event_unregister(event
);
1558 /* Check if has enablers without bytecode enabled */
1559 list_for_each_entry(enabler_ref
,
1560 &event
->enablers_ref_head
, node
) {
1561 if (enabler_ref
->ref
->enabled
1562 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1563 has_enablers_without_bytecode
= 1;
1567 event
->has_enablers_without_bytecode
=
1568 has_enablers_without_bytecode
;
1570 /* Enable filters */
1571 list_for_each_entry(runtime
,
1572 &event
->bytecode_runtime_head
, node
)
1573 lttng_filter_sync_state(runtime
);
1578 * Apply enablers to session events, adding events to session if need
1579 * be. It is required after each modification applied to an active
1580 * session, and right before session "start".
1581 * "lazy" sync means we only sync if required.
1582 * Should be called with sessions mutex held.
1585 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1587 /* We can skip if session is not active */
1588 if (!session
->active
)
1590 lttng_session_sync_enablers(session
);
1594 * Serialize at most one packet worth of metadata into a metadata
1596 * We grab the metadata cache mutex to get exclusive access to our metadata
1597 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1598 * allows us to do racy operations such as looking for remaining space left in
1599 * packet and write, since mutual exclusion protects us from concurrent writes.
1600 * Mutual exclusion on the metadata cache allow us to read the cache content
1601 * without racing against reallocation of the cache by updates.
1602 * Returns the number of bytes written in the channel, 0 if no data
1603 * was written and a negative value on error.
1605 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1606 struct channel
*chan
)
1608 struct lib_ring_buffer_ctx ctx
;
1610 size_t len
, reserve_len
;
1613 * Ensure we support mutiple get_next / put sequences followed by
1614 * put_next. The metadata cache lock protects reading the metadata
1615 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1616 * "flush" operations on the buffer invoked by different processes.
1617 * Moreover, since the metadata cache memory can be reallocated, we
1618 * need to have exclusive access against updates even though we only
1621 mutex_lock(&stream
->metadata_cache
->lock
);
1622 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1623 if (stream
->metadata_in
!= stream
->metadata_out
)
1626 /* Metadata regenerated, change the version. */
1627 if (stream
->metadata_cache
->version
!= stream
->version
)
1628 stream
->version
= stream
->metadata_cache
->version
;
1630 len
= stream
->metadata_cache
->metadata_written
-
1631 stream
->metadata_in
;
1634 reserve_len
= min_t(size_t,
1635 stream
->transport
->ops
.packet_avail_size(chan
),
1637 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1640 * If reservation failed, return an error to the caller.
1642 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1644 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1647 stream
->transport
->ops
.event_write(&ctx
,
1648 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1650 stream
->transport
->ops
.event_commit(&ctx
);
1651 stream
->metadata_in
+= reserve_len
;
1655 mutex_unlock(&stream
->metadata_cache
->lock
);
1660 * Write the metadata to the metadata cache.
1661 * Must be called with sessions_mutex held.
1662 * The metadata cache lock protects us from concurrent read access from
1663 * thread outputting metadata content to ring buffer.
1665 int lttng_metadata_printf(struct lttng_session
*session
,
1666 const char *fmt
, ...)
1671 struct lttng_metadata_stream
*stream
;
1673 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1676 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1682 mutex_lock(&session
->metadata_cache
->lock
);
1683 if (session
->metadata_cache
->metadata_written
+ len
>
1684 session
->metadata_cache
->cache_alloc
) {
1685 char *tmp_cache_realloc
;
1686 unsigned int tmp_cache_alloc_size
;
1688 tmp_cache_alloc_size
= max_t(unsigned int,
1689 session
->metadata_cache
->cache_alloc
+ len
,
1690 session
->metadata_cache
->cache_alloc
<< 1);
1691 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
1692 if (!tmp_cache_realloc
)
1694 if (session
->metadata_cache
->data
) {
1695 memcpy(tmp_cache_realloc
,
1696 session
->metadata_cache
->data
,
1697 session
->metadata_cache
->cache_alloc
);
1698 vfree(session
->metadata_cache
->data
);
1701 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1702 session
->metadata_cache
->data
= tmp_cache_realloc
;
1704 memcpy(session
->metadata_cache
->data
+
1705 session
->metadata_cache
->metadata_written
,
1707 session
->metadata_cache
->metadata_written
+= len
;
1708 mutex_unlock(&session
->metadata_cache
->lock
);
1711 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1712 wake_up_interruptible(&stream
->read_wait
);
1717 mutex_unlock(&session
->metadata_cache
->lock
);
1723 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1727 for (i
= 0; i
< nesting
; i
++) {
1730 ret
= lttng_metadata_printf(session
, " ");
1739 int lttng_field_name_statedump(struct lttng_session
*session
,
1740 const struct lttng_event_field
*field
,
1743 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
1747 int _lttng_integer_type_statedump(struct lttng_session
*session
,
1748 const struct lttng_type
*type
,
1753 WARN_ON_ONCE(type
->atype
!= atype_integer
);
1754 ret
= print_tabs(session
, nesting
);
1757 ret
= lttng_metadata_printf(session
,
1758 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
1759 type
->u
.integer
.size
,
1760 type
->u
.integer
.alignment
,
1761 type
->u
.integer
.signedness
,
1762 (type
->u
.integer
.encoding
== lttng_encode_none
)
1764 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
1767 type
->u
.integer
.base
,
1768 #if __BYTE_ORDER == __BIG_ENDIAN
1769 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
1771 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
1778 * Must be called with sessions_mutex held.
1781 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1782 const struct lttng_type
*type
,
1786 uint32_t i
, nr_fields
;
1787 unsigned int alignment
;
1789 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
1791 ret
= print_tabs(session
, nesting
);
1794 ret
= lttng_metadata_printf(session
,
1798 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
1799 for (i
= 0; i
< nr_fields
; i
++) {
1800 const struct lttng_event_field
*iter_field
;
1802 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
1803 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1807 ret
= print_tabs(session
, nesting
);
1810 alignment
= type
->u
.struct_nestable
.alignment
;
1812 ret
= lttng_metadata_printf(session
,
1816 ret
= lttng_metadata_printf(session
,
1823 * Must be called with sessions_mutex held.
1826 int _lttng_struct_field_statedump(struct lttng_session
*session
,
1827 const struct lttng_event_field
*field
,
1832 ret
= _lttng_struct_type_statedump(session
,
1833 &field
->type
, nesting
);
1836 return lttng_field_name_statedump(session
, field
, nesting
);
1840 * Must be called with sessions_mutex held.
1843 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1844 const struct lttng_type
*type
,
1848 uint32_t i
, nr_choices
;
1850 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
1852 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
1854 if (type
->u
.variant_nestable
.alignment
!= 0)
1856 ret
= print_tabs(session
, nesting
);
1859 ret
= lttng_metadata_printf(session
,
1860 "variant <_%s> {\n",
1861 type
->u
.variant_nestable
.tag_name
);
1864 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
1865 for (i
= 0; i
< nr_choices
; i
++) {
1866 const struct lttng_event_field
*iter_field
;
1868 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
1869 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1873 ret
= print_tabs(session
, nesting
);
1876 ret
= lttng_metadata_printf(session
,
1882 * Must be called with sessions_mutex held.
1885 int _lttng_variant_field_statedump(struct lttng_session
*session
,
1886 const struct lttng_event_field
*field
,
1891 ret
= _lttng_variant_type_statedump(session
,
1892 &field
->type
, nesting
);
1895 return lttng_field_name_statedump(session
, field
, nesting
);
1899 * Must be called with sessions_mutex held.
1902 int _lttng_array_field_statedump(struct lttng_session
*session
,
1903 const struct lttng_event_field
*field
,
1907 const struct lttng_type
*elem_type
;
1909 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
1911 if (field
->type
.u
.array_nestable
.alignment
) {
1912 ret
= print_tabs(session
, nesting
);
1915 ret
= lttng_metadata_printf(session
,
1916 "struct { } align(%u) _%s_padding;\n",
1917 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
1923 * Nested compound types: Only array of structures and variants are
1924 * currently supported.
1926 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
1927 switch (elem_type
->atype
) {
1929 case atype_struct_nestable
:
1930 case atype_variant_nestable
:
1931 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
1939 ret
= lttng_metadata_printf(session
,
1942 field
->type
.u
.array_nestable
.length
);
1947 * Must be called with sessions_mutex held.
1950 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
1951 const struct lttng_event_field
*field
,
1955 const char *length_name
;
1956 const struct lttng_type
*elem_type
;
1958 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
1960 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
1962 if (field
->type
.u
.sequence_nestable
.alignment
) {
1963 ret
= print_tabs(session
, nesting
);
1966 ret
= lttng_metadata_printf(session
,
1967 "struct { } align(%u) _%s_padding;\n",
1968 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
1975 * Nested compound types: Only array of structures and variants are
1976 * currently supported.
1978 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
1979 switch (elem_type
->atype
) {
1981 case atype_struct_nestable
:
1982 case atype_variant_nestable
:
1983 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
1991 ret
= lttng_metadata_printf(session
,
1994 field
->type
.u
.sequence_nestable
.length_name
);
1999 * Must be called with sessions_mutex held.
2002 int _lttng_enum_type_statedump(struct lttng_session
*session
,
2003 const struct lttng_type
*type
,
2006 const struct lttng_enum_desc
*enum_desc
;
2007 const struct lttng_type
*container_type
;
2009 unsigned int i
, nr_entries
;
2011 container_type
= type
->u
.enum_nestable
.container_type
;
2012 if (container_type
->atype
!= atype_integer
) {
2016 enum_desc
= type
->u
.enum_nestable
.desc
;
2017 nr_entries
= enum_desc
->nr_entries
;
2019 ret
= print_tabs(session
, nesting
);
2022 ret
= lttng_metadata_printf(session
, "enum : ");
2025 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
2028 ret
= lttng_metadata_printf(session
, " {\n");
2031 /* Dump all entries */
2032 for (i
= 0; i
< nr_entries
; i
++) {
2033 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
2036 ret
= print_tabs(session
, nesting
+ 1);
2039 ret
= lttng_metadata_printf(session
,
2043 len
= strlen(entry
->string
);
2044 /* Escape the character '"' */
2045 for (j
= 0; j
< len
; j
++) {
2046 char c
= entry
->string
[j
];
2050 ret
= lttng_metadata_printf(session
,
2054 ret
= lttng_metadata_printf(session
,
2058 ret
= lttng_metadata_printf(session
,
2065 ret
= lttng_metadata_printf(session
, "\"");
2069 if (entry
->options
.is_auto
) {
2070 ret
= lttng_metadata_printf(session
, ",\n");
2074 ret
= lttng_metadata_printf(session
,
2078 if (entry
->start
.signedness
)
2079 ret
= lttng_metadata_printf(session
,
2080 "%lld", (long long) entry
->start
.value
);
2082 ret
= lttng_metadata_printf(session
,
2083 "%llu", entry
->start
.value
);
2086 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2088 == entry
->end
.value
) {
2089 ret
= lttng_metadata_printf(session
,
2092 if (entry
->end
.signedness
) {
2093 ret
= lttng_metadata_printf(session
,
2095 (long long) entry
->end
.value
);
2097 ret
= lttng_metadata_printf(session
,
2106 ret
= print_tabs(session
, nesting
);
2109 ret
= lttng_metadata_printf(session
, "}");
2115 * Must be called with sessions_mutex held.
2118 int _lttng_enum_field_statedump(struct lttng_session
*session
,
2119 const struct lttng_event_field
*field
,
2124 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
2127 return lttng_field_name_statedump(session
, field
, nesting
);
2131 int _lttng_integer_field_statedump(struct lttng_session
*session
,
2132 const struct lttng_event_field
*field
,
2137 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
2140 return lttng_field_name_statedump(session
, field
, nesting
);
2144 int _lttng_string_type_statedump(struct lttng_session
*session
,
2145 const struct lttng_type
*type
,
2150 WARN_ON_ONCE(type
->atype
!= atype_string
);
2151 /* Default encoding is UTF8 */
2152 ret
= print_tabs(session
, nesting
);
2155 ret
= lttng_metadata_printf(session
,
2157 type
->u
.string
.encoding
== lttng_encode_ASCII
?
2158 " { encoding = ASCII; }" : "");
2163 int _lttng_string_field_statedump(struct lttng_session
*session
,
2164 const struct lttng_event_field
*field
,
2169 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
2170 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
2173 return lttng_field_name_statedump(session
, field
, nesting
);
2177 * Must be called with sessions_mutex held.
2180 int _lttng_type_statedump(struct lttng_session
*session
,
2181 const struct lttng_type
*type
,
2186 switch (type
->atype
) {
2188 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
2190 case atype_enum_nestable
:
2191 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
2194 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
2196 case atype_struct_nestable
:
2197 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
2199 case atype_variant_nestable
:
2200 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
2203 /* Nested arrays and sequences are not supported yet. */
2204 case atype_array_nestable
:
2205 case atype_sequence_nestable
:
2214 * Must be called with sessions_mutex held.
2217 int _lttng_field_statedump(struct lttng_session
*session
,
2218 const struct lttng_event_field
*field
,
2223 switch (field
->type
.atype
) {
2225 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
2227 case atype_enum_nestable
:
2228 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
2231 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
2233 case atype_struct_nestable
:
2234 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
2236 case atype_array_nestable
:
2237 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
2239 case atype_sequence_nestable
:
2240 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
2242 case atype_variant_nestable
:
2243 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
2254 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2255 struct lttng_ctx
*ctx
)
2262 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2263 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2265 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2273 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2274 struct lttng_event
*event
)
2276 const struct lttng_event_desc
*desc
= event
->desc
;
2280 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2281 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2283 ret
= _lttng_field_statedump(session
, field
, 2);
2291 * Must be called with sessions_mutex held.
2294 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2295 struct lttng_channel
*chan
,
2296 struct lttng_event
*event
)
2300 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2302 if (chan
->channel_type
== METADATA_CHANNEL
)
2305 ret
= lttng_metadata_printf(session
,
2309 " stream_id = %u;\n",
2317 ret
= lttng_metadata_printf(session
,
2318 " context := struct {\n");
2322 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2326 ret
= lttng_metadata_printf(session
,
2332 ret
= lttng_metadata_printf(session
,
2333 " fields := struct {\n"
2338 ret
= _lttng_fields_metadata_statedump(session
, event
);
2343 * LTTng space reservation can only reserve multiples of the
2346 ret
= lttng_metadata_printf(session
,
2352 event
->metadata_dumped
= 1;
2359 * Must be called with sessions_mutex held.
2362 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2363 struct lttng_channel
*chan
)
2367 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2370 if (chan
->channel_type
== METADATA_CHANNEL
)
2373 WARN_ON_ONCE(!chan
->header_type
);
2374 ret
= lttng_metadata_printf(session
,
2377 " event.header := %s;\n"
2378 " packet.context := struct packet_context;\n",
2380 chan
->header_type
== 1 ? "struct event_header_compact" :
2381 "struct event_header_large");
2386 ret
= lttng_metadata_printf(session
,
2387 " event.context := struct {\n");
2391 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2395 ret
= lttng_metadata_printf(session
,
2401 ret
= lttng_metadata_printf(session
,
2404 chan
->metadata_dumped
= 1;
2410 * Must be called with sessions_mutex held.
2413 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2415 return lttng_metadata_printf(session
,
2416 "struct packet_context {\n"
2417 " uint64_clock_monotonic_t timestamp_begin;\n"
2418 " uint64_clock_monotonic_t timestamp_end;\n"
2419 " uint64_t content_size;\n"
2420 " uint64_t packet_size;\n"
2421 " uint64_t packet_seq_num;\n"
2422 " unsigned long events_discarded;\n"
2423 " uint32_t cpu_id;\n"
2430 * id: range: 0 - 30.
2431 * id 31 is reserved to indicate an extended header.
2434 * id: range: 0 - 65534.
2435 * id 65535 is reserved to indicate an extended header.
2437 * Must be called with sessions_mutex held.
2440 int _lttng_event_header_declare(struct lttng_session
*session
)
2442 return lttng_metadata_printf(session
,
2443 "struct event_header_compact {\n"
2444 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2447 " uint27_clock_monotonic_t timestamp;\n"
2451 " uint64_clock_monotonic_t timestamp;\n"
2456 "struct event_header_large {\n"
2457 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2460 " uint32_clock_monotonic_t timestamp;\n"
2464 " uint64_clock_monotonic_t timestamp;\n"
2468 lttng_alignof(uint32_t) * CHAR_BIT
,
2469 lttng_alignof(uint16_t) * CHAR_BIT
2474 * Approximation of NTP time of day to clock monotonic correlation,
2475 * taken at start of trace.
2476 * Yes, this is only an approximation. Yes, we can (and will) do better
2477 * in future versions.
2478 * This function may return a negative offset. It may happen if the
2479 * system sets the REALTIME clock to 0 after boot.
2481 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2485 int64_t measure_clock_offset(void)
2487 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2488 uint64_t tcf
= trace_clock_freq();
2490 unsigned long flags
;
2491 struct timespec64 rts
= { 0, 0 };
2493 /* Disable interrupts to increase correlation precision. */
2494 local_irq_save(flags
);
2495 monotonic
[0] = trace_clock_read64();
2496 ktime_get_real_ts64(&rts
);
2497 monotonic
[1] = trace_clock_read64();
2498 local_irq_restore(flags
);
2500 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2501 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2502 if (tcf
== NSEC_PER_SEC
) {
2503 realtime
+= rts
.tv_nsec
;
2505 uint64_t n
= rts
.tv_nsec
* tcf
;
2507 do_div(n
, NSEC_PER_SEC
);
2510 offset
= (int64_t) realtime
- monotonic_avg
;
2515 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
2523 while (cur
!= '\0') {
2526 ret
= lttng_metadata_printf(session
, "%s", "\\n");
2530 ret
= lttng_metadata_printf(session
, "%c", '\\');
2533 /* We still print the current char */
2536 ret
= lttng_metadata_printf(session
, "%c", cur
);
2550 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
2551 const char *field_value
)
2555 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
2559 ret
= print_escaped_ctf_string(session
, field_value
);
2563 ret
= lttng_metadata_printf(session
, "\";\n");
2570 * Output metadata into this session's metadata buffers.
2571 * Must be called with sessions_mutex held.
2574 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2576 unsigned char *uuid_c
= session
->uuid
.b
;
2577 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2578 const char *product_uuid
;
2579 struct lttng_channel
*chan
;
2580 struct lttng_event
*event
;
2583 if (!READ_ONCE(session
->active
))
2585 if (session
->metadata_dumped
)
2588 snprintf(uuid_s
, sizeof(uuid_s
),
2589 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2590 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2591 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2592 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2593 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2595 ret
= lttng_metadata_printf(session
,
2596 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2597 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2598 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2599 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2600 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2601 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2602 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2608 " byte_order = %s;\n"
2609 " packet.header := struct {\n"
2610 " uint32_t magic;\n"
2611 " uint8_t uuid[16];\n"
2612 " uint32_t stream_id;\n"
2613 " uint64_t stream_instance_id;\n"
2616 lttng_alignof(uint8_t) * CHAR_BIT
,
2617 lttng_alignof(uint16_t) * CHAR_BIT
,
2618 lttng_alignof(uint32_t) * CHAR_BIT
,
2619 lttng_alignof(uint64_t) * CHAR_BIT
,
2620 sizeof(unsigned long) * CHAR_BIT
,
2621 lttng_alignof(unsigned long) * CHAR_BIT
,
2625 #if __BYTE_ORDER == __BIG_ENDIAN
2634 ret
= lttng_metadata_printf(session
,
2636 " hostname = \"%s\";\n"
2637 " domain = \"kernel\";\n"
2638 " sysname = \"%s\";\n"
2639 " kernel_release = \"%s\";\n"
2640 " kernel_version = \"%s\";\n"
2641 " tracer_name = \"lttng-modules\";\n"
2642 " tracer_major = %d;\n"
2643 " tracer_minor = %d;\n"
2644 " tracer_patchlevel = %d;\n"
2645 " trace_buffering_scheme = \"global\";\n",
2646 current
->nsproxy
->uts_ns
->name
.nodename
,
2650 LTTNG_MODULES_MAJOR_VERSION
,
2651 LTTNG_MODULES_MINOR_VERSION
,
2652 LTTNG_MODULES_PATCHLEVEL_VERSION
2657 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
2660 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
2661 session
->creation_time
);
2665 /* Add the product UUID to the 'env' section */
2666 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
2668 ret
= lttng_metadata_printf(session
,
2669 " product_uuid = \"%s\";\n",
2676 /* Close the 'env' section */
2677 ret
= lttng_metadata_printf(session
, "};\n\n");
2681 ret
= lttng_metadata_printf(session
,
2683 " name = \"%s\";\n",
2689 if (!trace_clock_uuid(clock_uuid_s
)) {
2690 ret
= lttng_metadata_printf(session
,
2691 " uuid = \"%s\";\n",
2698 ret
= lttng_metadata_printf(session
,
2699 " description = \"%s\";\n"
2700 " freq = %llu; /* Frequency, in Hz */\n"
2701 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2704 trace_clock_description(),
2705 (unsigned long long) trace_clock_freq(),
2706 (long long) measure_clock_offset()
2711 ret
= lttng_metadata_printf(session
,
2712 "typealias integer {\n"
2713 " size = 27; align = 1; signed = false;\n"
2714 " map = clock.%s.value;\n"
2715 "} := uint27_clock_monotonic_t;\n"
2717 "typealias integer {\n"
2718 " size = 32; align = %u; signed = false;\n"
2719 " map = clock.%s.value;\n"
2720 "} := uint32_clock_monotonic_t;\n"
2722 "typealias integer {\n"
2723 " size = 64; align = %u; signed = false;\n"
2724 " map = clock.%s.value;\n"
2725 "} := uint64_clock_monotonic_t;\n\n",
2727 lttng_alignof(uint32_t) * CHAR_BIT
,
2729 lttng_alignof(uint64_t) * CHAR_BIT
,
2735 ret
= _lttng_stream_packet_context_declare(session
);
2739 ret
= _lttng_event_header_declare(session
);
2744 list_for_each_entry(chan
, &session
->chan
, list
) {
2745 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2750 list_for_each_entry(event
, &session
->events
, list
) {
2751 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2755 session
->metadata_dumped
= 1;
2761 * lttng_transport_register - LTT transport registration
2762 * @transport: transport structure
2764 * Registers a transport which can be used as output to extract the data out of
2767 void lttng_transport_register(struct lttng_transport
*transport
)
2769 mutex_lock(&sessions_mutex
);
2770 list_add_tail(&transport
->node
, <tng_transport_list
);
2771 mutex_unlock(&sessions_mutex
);
2773 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2776 * lttng_transport_unregister - LTT transport unregistration
2777 * @transport: transport structure
2779 void lttng_transport_unregister(struct lttng_transport
*transport
)
2781 mutex_lock(&sessions_mutex
);
2782 list_del(&transport
->node
);
2783 mutex_unlock(&sessions_mutex
);
2785 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2787 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2789 enum cpuhp_state lttng_hp_prepare
;
2790 enum cpuhp_state lttng_hp_online
;
2792 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2794 struct lttng_cpuhp_node
*lttng_node
;
2796 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2797 switch (lttng_node
->component
) {
2798 case LTTNG_RING_BUFFER_FRONTEND
:
2800 case LTTNG_RING_BUFFER_BACKEND
:
2801 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2802 case LTTNG_RING_BUFFER_ITER
:
2804 case LTTNG_CONTEXT_PERF_COUNTERS
:
2811 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2813 struct lttng_cpuhp_node
*lttng_node
;
2815 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2816 switch (lttng_node
->component
) {
2817 case LTTNG_RING_BUFFER_FRONTEND
:
2818 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2819 case LTTNG_RING_BUFFER_BACKEND
:
2821 case LTTNG_RING_BUFFER_ITER
:
2823 case LTTNG_CONTEXT_PERF_COUNTERS
:
2824 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2830 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2832 struct lttng_cpuhp_node
*lttng_node
;
2834 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2835 switch (lttng_node
->component
) {
2836 case LTTNG_RING_BUFFER_FRONTEND
:
2837 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2838 case LTTNG_RING_BUFFER_BACKEND
:
2840 case LTTNG_RING_BUFFER_ITER
:
2841 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2842 case LTTNG_CONTEXT_PERF_COUNTERS
:
2843 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2849 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2851 struct lttng_cpuhp_node
*lttng_node
;
2853 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2854 switch (lttng_node
->component
) {
2855 case LTTNG_RING_BUFFER_FRONTEND
:
2856 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2857 case LTTNG_RING_BUFFER_BACKEND
:
2859 case LTTNG_RING_BUFFER_ITER
:
2861 case LTTNG_CONTEXT_PERF_COUNTERS
:
2868 static int __init
lttng_init_cpu_hotplug(void)
2872 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2873 lttng_hotplug_prepare
,
2874 lttng_hotplug_dead
);
2878 lttng_hp_prepare
= ret
;
2879 lttng_rb_set_hp_prepare(ret
);
2881 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2882 lttng_hotplug_online
,
2883 lttng_hotplug_offline
);
2885 cpuhp_remove_multi_state(lttng_hp_prepare
);
2886 lttng_hp_prepare
= 0;
2889 lttng_hp_online
= ret
;
2890 lttng_rb_set_hp_online(ret
);
2895 static void __exit
lttng_exit_cpu_hotplug(void)
2897 lttng_rb_set_hp_online(0);
2898 cpuhp_remove_multi_state(lttng_hp_online
);
2899 lttng_rb_set_hp_prepare(0);
2900 cpuhp_remove_multi_state(lttng_hp_prepare
);
2903 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2904 static int lttng_init_cpu_hotplug(void)
2908 static void lttng_exit_cpu_hotplug(void)
2911 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2914 static int __init
lttng_events_init(void)
2918 ret
= lttng_probes_init();
2921 ret
= lttng_context_init();
2924 ret
= lttng_tracepoint_init();
2927 event_cache
= KMEM_CACHE(lttng_event
, 0);
2932 ret
= lttng_abi_init();
2935 ret
= lttng_logger_init();
2938 ret
= lttng_init_cpu_hotplug();
2941 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2942 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2943 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2944 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2945 LTTNG_MODULES_EXTRAVERSION
,
2947 #ifdef LTTNG_EXTRA_VERSION_GIT
2948 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2952 #ifdef LTTNG_EXTRA_VERSION_NAME
2953 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2960 lttng_logger_exit();
2964 kmem_cache_destroy(event_cache
);
2966 lttng_tracepoint_exit();
2968 lttng_context_exit();
2969 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2970 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2971 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2972 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2973 LTTNG_MODULES_EXTRAVERSION
,
2975 #ifdef LTTNG_EXTRA_VERSION_GIT
2976 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2980 #ifdef LTTNG_EXTRA_VERSION_NAME
2981 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2988 module_init(lttng_events_init
);
2990 static void __exit
lttng_events_exit(void)
2992 struct lttng_session
*session
, *tmpsession
;
2994 lttng_exit_cpu_hotplug();
2995 lttng_logger_exit();
2997 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2998 lttng_session_destroy(session
);
2999 kmem_cache_destroy(event_cache
);
3000 lttng_tracepoint_exit();
3001 lttng_context_exit();
3002 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
3003 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3004 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3005 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3006 LTTNG_MODULES_EXTRAVERSION
,
3008 #ifdef LTTNG_EXTRA_VERSION_GIT
3009 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3013 #ifdef LTTNG_EXTRA_VERSION_NAME
3014 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3020 module_exit(lttng_events_exit
);
3022 #include "extra_version/patches.i"
3023 #ifdef LTTNG_EXTRA_VERSION_GIT
3024 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
3026 #ifdef LTTNG_EXTRA_VERSION_NAME
3027 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
3029 MODULE_LICENSE("GPL and additional rights");
3030 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3031 MODULE_DESCRIPTION("LTTng tracer");
3032 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
3033 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
3034 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
3035 LTTNG_MODULES_EXTRAVERSION
);