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>
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/uuid.h>
30 #include <linux/dmi.h>
31 #include <linux/vmalloc.h>
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng-kernel-version.h>
38 #include <lttng-events.h>
39 #include <lttng-tracer.h>
40 #include <lttng-abi-old.h>
41 #include <lttng-endian.h>
42 #include <lttng-string-utils.h>
43 #include <wrapper/ringbuffer/backend.h>
44 #include <wrapper/ringbuffer/frontend.h>
46 #define METADATA_CACHE_DEFAULT_SIZE 4096
48 static LIST_HEAD(sessions
);
49 static LIST_HEAD(lttng_transport_list
);
51 * Protect the sessions and metadata caches.
53 static DEFINE_MUTEX(sessions_mutex
);
54 static struct kmem_cache
*event_cache
;
56 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
57 static void lttng_session_sync_enablers(struct lttng_session
*session
);
58 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
60 static void _lttng_event_destroy(struct lttng_event
*event
);
61 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
62 static int _lttng_event_unregister(struct lttng_event
*event
);
64 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
65 struct lttng_channel
*chan
,
66 struct lttng_event
*event
);
68 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
70 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
72 int _lttng_type_statedump(struct lttng_session
*session
,
73 const struct lttng_type
*type
,
76 int _lttng_field_statedump(struct lttng_session
*session
,
77 const struct lttng_event_field
*field
,
80 void synchronize_trace(void)
82 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
88 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
89 #ifdef CONFIG_PREEMPT_RT_FULL
92 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
93 #ifdef CONFIG_PREEMPT_RT
96 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
99 void lttng_lock_sessions(void)
101 mutex_lock(&sessions_mutex
);
104 void lttng_unlock_sessions(void)
106 mutex_unlock(&sessions_mutex
);
110 * Called with sessions lock held.
112 int lttng_session_active(void)
114 struct lttng_session
*iter
;
116 list_for_each_entry(iter
, &sessions
, list
) {
123 struct lttng_session
*lttng_session_create(void)
125 struct lttng_session
*session
;
126 struct lttng_metadata_cache
*metadata_cache
;
129 mutex_lock(&sessions_mutex
);
130 session
= kvzalloc_node(sizeof(struct lttng_session
), GFP_KERNEL
,
134 INIT_LIST_HEAD(&session
->chan
);
135 INIT_LIST_HEAD(&session
->events
);
136 guid_gen(&session
->uuid
);
138 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
141 goto err_free_session
;
142 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
143 if (!metadata_cache
->data
)
145 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
146 kref_init(&metadata_cache
->refcount
);
147 mutex_init(&metadata_cache
->lock
);
148 session
->metadata_cache
= metadata_cache
;
149 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
150 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
151 sizeof(metadata_cache
->uuid
));
152 INIT_LIST_HEAD(&session
->enablers_head
);
153 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
154 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
155 list_add(&session
->list
, &sessions
);
156 session
->pid_tracker
.session
= session
;
157 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
158 session
->vpid_tracker
.session
= session
;
159 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
160 session
->uid_tracker
.session
= session
;
161 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
162 session
->vuid_tracker
.session
= session
;
163 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
164 session
->gid_tracker
.session
= session
;
165 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
166 session
->vgid_tracker
.session
= session
;
167 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
168 mutex_unlock(&sessions_mutex
);
172 kfree(metadata_cache
);
176 mutex_unlock(&sessions_mutex
);
180 void metadata_cache_destroy(struct kref
*kref
)
182 struct lttng_metadata_cache
*cache
=
183 container_of(kref
, struct lttng_metadata_cache
, refcount
);
188 void lttng_session_destroy(struct lttng_session
*session
)
190 struct lttng_channel
*chan
, *tmpchan
;
191 struct lttng_event
*event
, *tmpevent
;
192 struct lttng_metadata_stream
*metadata_stream
;
193 struct lttng_enabler
*enabler
, *tmpenabler
;
196 mutex_lock(&sessions_mutex
);
197 WRITE_ONCE(session
->active
, 0);
198 list_for_each_entry(chan
, &session
->chan
, list
) {
199 ret
= lttng_syscalls_unregister(chan
);
202 list_for_each_entry(event
, &session
->events
, list
) {
203 ret
= _lttng_event_unregister(event
);
206 synchronize_trace(); /* Wait for in-flight events to complete */
207 list_for_each_entry_safe(enabler
, tmpenabler
,
208 &session
->enablers_head
, node
)
209 lttng_enabler_destroy(enabler
);
210 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
211 _lttng_event_destroy(event
);
212 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
213 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
214 _lttng_channel_destroy(chan
);
216 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
217 _lttng_metadata_channel_hangup(metadata_stream
);
218 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
219 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
220 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
221 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
222 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
223 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
224 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
225 list_del(&session
->list
);
226 mutex_unlock(&sessions_mutex
);
230 int lttng_session_statedump(struct lttng_session
*session
)
234 mutex_lock(&sessions_mutex
);
235 ret
= lttng_statedump_start(session
);
236 mutex_unlock(&sessions_mutex
);
240 int lttng_session_enable(struct lttng_session
*session
)
243 struct lttng_channel
*chan
;
245 mutex_lock(&sessions_mutex
);
246 if (session
->active
) {
251 /* Set transient enabler state to "enabled" */
254 /* We need to sync enablers with session before activation. */
255 lttng_session_sync_enablers(session
);
258 * Snapshot the number of events per channel to know the type of header
261 list_for_each_entry(chan
, &session
->chan
, list
) {
262 if (chan
->header_type
)
263 continue; /* don't change it if session stop/restart */
264 if (chan
->free_event_id
< 31)
265 chan
->header_type
= 1; /* compact */
267 chan
->header_type
= 2; /* large */
270 /* Clear each stream's quiescent state. */
271 list_for_each_entry(chan
, &session
->chan
, list
) {
272 if (chan
->channel_type
!= METADATA_CHANNEL
)
273 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
276 WRITE_ONCE(session
->active
, 1);
277 WRITE_ONCE(session
->been_active
, 1);
278 ret
= _lttng_session_metadata_statedump(session
);
280 WRITE_ONCE(session
->active
, 0);
283 ret
= lttng_statedump_start(session
);
285 WRITE_ONCE(session
->active
, 0);
287 mutex_unlock(&sessions_mutex
);
291 int lttng_session_disable(struct lttng_session
*session
)
294 struct lttng_channel
*chan
;
296 mutex_lock(&sessions_mutex
);
297 if (!session
->active
) {
301 WRITE_ONCE(session
->active
, 0);
303 /* Set transient enabler state to "disabled" */
305 lttng_session_sync_enablers(session
);
307 /* Set each stream's quiescent state. */
308 list_for_each_entry(chan
, &session
->chan
, list
) {
309 if (chan
->channel_type
!= METADATA_CHANNEL
)
310 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
313 mutex_unlock(&sessions_mutex
);
317 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
320 struct lttng_channel
*chan
;
321 struct lttng_event
*event
;
322 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
323 struct lttng_metadata_stream
*stream
;
325 mutex_lock(&sessions_mutex
);
326 if (!session
->active
) {
331 mutex_lock(&cache
->lock
);
332 memset(cache
->data
, 0, cache
->cache_alloc
);
333 cache
->metadata_written
= 0;
335 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
336 stream
->metadata_out
= 0;
337 stream
->metadata_in
= 0;
339 mutex_unlock(&cache
->lock
);
341 session
->metadata_dumped
= 0;
342 list_for_each_entry(chan
, &session
->chan
, list
) {
343 chan
->metadata_dumped
= 0;
346 list_for_each_entry(event
, &session
->events
, list
) {
347 event
->metadata_dumped
= 0;
350 ret
= _lttng_session_metadata_statedump(session
);
353 mutex_unlock(&sessions_mutex
);
357 int lttng_channel_enable(struct lttng_channel
*channel
)
361 mutex_lock(&sessions_mutex
);
362 if (channel
->channel_type
== METADATA_CHANNEL
) {
366 if (channel
->enabled
) {
370 /* Set transient enabler state to "enabled" */
372 lttng_session_sync_enablers(channel
->session
);
373 /* Set atomically the state to "enabled" */
374 WRITE_ONCE(channel
->enabled
, 1);
376 mutex_unlock(&sessions_mutex
);
380 int lttng_channel_disable(struct lttng_channel
*channel
)
384 mutex_lock(&sessions_mutex
);
385 if (channel
->channel_type
== METADATA_CHANNEL
) {
389 if (!channel
->enabled
) {
393 /* Set atomically the state to "disabled" */
394 WRITE_ONCE(channel
->enabled
, 0);
395 /* Set transient enabler state to "enabled" */
397 lttng_session_sync_enablers(channel
->session
);
399 mutex_unlock(&sessions_mutex
);
403 int lttng_event_enable(struct lttng_event
*event
)
407 mutex_lock(&sessions_mutex
);
408 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
412 if (event
->enabled
) {
416 switch (event
->instrumentation
) {
417 case LTTNG_KERNEL_TRACEPOINT
:
418 case LTTNG_KERNEL_SYSCALL
:
421 case LTTNG_KERNEL_KPROBE
:
422 case LTTNG_KERNEL_UPROBE
:
423 case LTTNG_KERNEL_NOOP
:
424 WRITE_ONCE(event
->enabled
, 1);
426 case LTTNG_KERNEL_KRETPROBE
:
427 ret
= lttng_kretprobes_event_enable_state(event
, 1);
429 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
435 mutex_unlock(&sessions_mutex
);
439 int lttng_event_disable(struct lttng_event
*event
)
443 mutex_lock(&sessions_mutex
);
444 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
448 if (!event
->enabled
) {
452 switch (event
->instrumentation
) {
453 case LTTNG_KERNEL_TRACEPOINT
:
454 case LTTNG_KERNEL_SYSCALL
:
457 case LTTNG_KERNEL_KPROBE
:
458 case LTTNG_KERNEL_UPROBE
:
459 case LTTNG_KERNEL_NOOP
:
460 WRITE_ONCE(event
->enabled
, 0);
462 case LTTNG_KERNEL_KRETPROBE
:
463 ret
= lttng_kretprobes_event_enable_state(event
, 0);
465 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
471 mutex_unlock(&sessions_mutex
);
475 static struct lttng_transport
*lttng_transport_find(const char *name
)
477 struct lttng_transport
*transport
;
479 list_for_each_entry(transport
, <tng_transport_list
, node
) {
480 if (!strcmp(transport
->name
, name
))
486 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
487 const char *transport_name
,
489 size_t subbuf_size
, size_t num_subbuf
,
490 unsigned int switch_timer_interval
,
491 unsigned int read_timer_interval
,
492 enum channel_type channel_type
)
494 struct lttng_channel
*chan
;
495 struct lttng_transport
*transport
= NULL
;
497 mutex_lock(&sessions_mutex
);
498 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
499 goto active
; /* Refuse to add channel to active session */
500 transport
= lttng_transport_find(transport_name
);
502 printk(KERN_WARNING
"LTTng transport %s not found\n",
506 if (!try_module_get(transport
->owner
)) {
507 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
510 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
513 chan
->session
= session
;
514 chan
->id
= session
->free_chan_id
++;
515 chan
->ops
= &transport
->ops
;
517 * Note: the channel creation op already writes into the packet
518 * headers. Therefore the "chan" information used as input
519 * should be already accessible.
521 chan
->chan
= transport
->ops
.channel_create(transport_name
,
522 chan
, buf_addr
, subbuf_size
, num_subbuf
,
523 switch_timer_interval
, read_timer_interval
);
528 chan
->transport
= transport
;
529 chan
->channel_type
= channel_type
;
530 list_add(&chan
->list
, &session
->chan
);
531 mutex_unlock(&sessions_mutex
);
538 module_put(transport
->owner
);
541 mutex_unlock(&sessions_mutex
);
546 * Only used internally at session destruction for per-cpu channels, and
547 * when metadata channel is released.
548 * Needs to be called with sessions mutex held.
551 void _lttng_channel_destroy(struct lttng_channel
*chan
)
553 chan
->ops
->channel_destroy(chan
->chan
);
554 module_put(chan
->transport
->owner
);
555 list_del(&chan
->list
);
556 lttng_destroy_context(chan
->ctx
);
560 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
562 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
564 /* Protect the metadata cache with the sessions_mutex. */
565 mutex_lock(&sessions_mutex
);
566 _lttng_channel_destroy(chan
);
567 mutex_unlock(&sessions_mutex
);
569 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
572 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
574 stream
->finalized
= 1;
575 wake_up_interruptible(&stream
->read_wait
);
579 * Supports event creation while tracing session is active.
580 * Needs to be called with sessions mutex held.
582 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
583 struct lttng_kernel_event
*event_param
,
585 const struct lttng_event_desc
*event_desc
,
586 enum lttng_kernel_instrumentation itype
)
588 struct lttng_session
*session
= chan
->session
;
589 struct lttng_event
*event
;
590 const char *event_name
;
591 struct hlist_head
*head
;
596 if (chan
->free_event_id
== -1U) {
602 case LTTNG_KERNEL_TRACEPOINT
:
603 event_name
= event_desc
->name
;
605 case LTTNG_KERNEL_KPROBE
:
606 case LTTNG_KERNEL_UPROBE
:
607 case LTTNG_KERNEL_KRETPROBE
:
608 case LTTNG_KERNEL_NOOP
:
609 case LTTNG_KERNEL_SYSCALL
:
610 event_name
= event_param
->name
;
612 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
618 name_len
= strlen(event_name
);
619 hash
= jhash(event_name
, name_len
, 0);
620 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
621 lttng_hlist_for_each_entry(event
, head
, hlist
) {
622 WARN_ON_ONCE(!event
->desc
);
623 if (!strncmp(event
->desc
->name
, event_name
,
624 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
625 && chan
== event
->chan
) {
631 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
637 event
->filter
= filter
;
638 event
->id
= chan
->free_event_id
++;
639 event
->instrumentation
= itype
;
640 event
->evtype
= LTTNG_TYPE_EVENT
;
641 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
642 INIT_LIST_HEAD(&event
->enablers_ref_head
);
645 case LTTNG_KERNEL_TRACEPOINT
:
646 /* Event will be enabled by enabler sync. */
648 event
->registered
= 0;
649 event
->desc
= lttng_event_get(event_name
);
654 /* Populate lttng_event structure before event registration. */
657 case LTTNG_KERNEL_KPROBE
:
659 * Needs to be explicitly enabled after creation, since
660 * we may want to apply filters.
663 event
->registered
= 1;
665 * Populate lttng_event structure before event
669 ret
= lttng_kprobes_register(event_name
,
670 event_param
->u
.kprobe
.symbol_name
,
671 event_param
->u
.kprobe
.offset
,
672 event_param
->u
.kprobe
.addr
,
678 ret
= try_module_get(event
->desc
->owner
);
681 case LTTNG_KERNEL_KRETPROBE
:
683 struct lttng_event
*event_return
;
685 /* kretprobe defines 2 events */
687 * Needs to be explicitly enabled after creation, since
688 * we may want to apply filters.
691 event
->registered
= 1;
693 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
698 event_return
->chan
= chan
;
699 event_return
->filter
= filter
;
700 event_return
->id
= chan
->free_event_id
++;
701 event_return
->enabled
= 0;
702 event_return
->registered
= 1;
703 event_return
->instrumentation
= itype
;
705 * Populate lttng_event structure before kretprobe registration.
708 ret
= lttng_kretprobes_register(event_name
,
709 event_param
->u
.kretprobe
.symbol_name
,
710 event_param
->u
.kretprobe
.offset
,
711 event_param
->u
.kretprobe
.addr
,
712 event
, event_return
);
714 kmem_cache_free(event_cache
, event_return
);
718 /* Take 2 refs on the module: one per event. */
719 ret
= try_module_get(event
->desc
->owner
);
721 ret
= try_module_get(event
->desc
->owner
);
723 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
725 WARN_ON_ONCE(ret
> 0);
727 kmem_cache_free(event_cache
, event_return
);
728 module_put(event
->desc
->owner
);
729 module_put(event
->desc
->owner
);
730 goto statedump_error
;
732 list_add(&event_return
->list
, &chan
->session
->events
);
735 case LTTNG_KERNEL_NOOP
:
736 case LTTNG_KERNEL_SYSCALL
:
738 * Needs to be explicitly enabled after creation, since
739 * we may want to apply filters.
742 event
->registered
= 0;
743 event
->desc
= event_desc
;
749 case LTTNG_KERNEL_UPROBE
:
751 * Needs to be explicitly enabled after creation, since
752 * we may want to apply filters.
755 event
->registered
= 1;
758 * Populate lttng_event structure before event
763 ret
= lttng_uprobes_register(event_param
->name
,
764 event_param
->u
.uprobe
.fd
,
768 ret
= try_module_get(event
->desc
->owner
);
771 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
777 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
778 WARN_ON_ONCE(ret
> 0);
780 goto statedump_error
;
782 hlist_add_head(&event
->hlist
, head
);
783 list_add(&event
->list
, &chan
->session
->events
);
787 /* If a statedump error occurs, events will not be readable. */
789 kmem_cache_free(event_cache
, event
);
797 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
798 struct lttng_kernel_event
*event_param
,
800 const struct lttng_event_desc
*event_desc
,
801 enum lttng_kernel_instrumentation itype
)
803 struct lttng_event
*event
;
805 mutex_lock(&sessions_mutex
);
806 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
808 mutex_unlock(&sessions_mutex
);
812 /* Only used for tracepoints for now. */
814 void register_event(struct lttng_event
*event
)
816 const struct lttng_event_desc
*desc
;
819 if (event
->registered
)
823 switch (event
->instrumentation
) {
824 case LTTNG_KERNEL_TRACEPOINT
:
825 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
826 desc
->probe_callback
,
829 case LTTNG_KERNEL_SYSCALL
:
830 ret
= lttng_syscall_filter_enable(event
->chan
,
833 case LTTNG_KERNEL_KPROBE
:
834 case LTTNG_KERNEL_UPROBE
:
835 case LTTNG_KERNEL_KRETPROBE
:
836 case LTTNG_KERNEL_NOOP
:
839 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
844 event
->registered
= 1;
848 * Only used internally at session destruction.
850 int _lttng_event_unregister(struct lttng_event
*event
)
852 const struct lttng_event_desc
*desc
;
855 if (!event
->registered
)
859 switch (event
->instrumentation
) {
860 case LTTNG_KERNEL_TRACEPOINT
:
861 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
862 event
->desc
->probe_callback
,
865 case LTTNG_KERNEL_KPROBE
:
866 lttng_kprobes_unregister(event
);
869 case LTTNG_KERNEL_KRETPROBE
:
870 lttng_kretprobes_unregister(event
);
873 case LTTNG_KERNEL_SYSCALL
:
874 ret
= lttng_syscall_filter_disable(event
->chan
,
877 case LTTNG_KERNEL_NOOP
:
880 case LTTNG_KERNEL_UPROBE
:
881 lttng_uprobes_unregister(event
);
884 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
889 event
->registered
= 0;
894 * Only used internally at session destruction.
897 void _lttng_event_destroy(struct lttng_event
*event
)
899 switch (event
->instrumentation
) {
900 case LTTNG_KERNEL_TRACEPOINT
:
901 lttng_event_put(event
->desc
);
903 case LTTNG_KERNEL_KPROBE
:
904 module_put(event
->desc
->owner
);
905 lttng_kprobes_destroy_private(event
);
907 case LTTNG_KERNEL_KRETPROBE
:
908 module_put(event
->desc
->owner
);
909 lttng_kretprobes_destroy_private(event
);
911 case LTTNG_KERNEL_NOOP
:
912 case LTTNG_KERNEL_SYSCALL
:
914 case LTTNG_KERNEL_UPROBE
:
915 module_put(event
->desc
->owner
);
916 lttng_uprobes_destroy_private(event
);
918 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
922 list_del(&event
->list
);
923 lttng_destroy_context(event
->ctx
);
924 kmem_cache_free(event_cache
, event
);
927 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
928 enum tracker_type tracker_type
)
930 switch (tracker_type
) {
932 return &session
->pid_tracker
;
934 return &session
->vpid_tracker
;
936 return &session
->uid_tracker
;
938 return &session
->vuid_tracker
;
940 return &session
->gid_tracker
;
942 return &session
->vgid_tracker
;
949 int lttng_session_track_id(struct lttng_session
*session
,
950 enum tracker_type tracker_type
, int id
)
952 struct lttng_id_tracker
*tracker
;
955 tracker
= get_tracker(session
, tracker_type
);
960 mutex_lock(&sessions_mutex
);
962 /* track all ids: destroy tracker. */
963 lttng_id_tracker_destroy(tracker
, true);
966 ret
= lttng_id_tracker_add(tracker
, id
);
968 mutex_unlock(&sessions_mutex
);
972 int lttng_session_untrack_id(struct lttng_session
*session
,
973 enum tracker_type tracker_type
, int id
)
975 struct lttng_id_tracker
*tracker
;
978 tracker
= get_tracker(session
, tracker_type
);
983 mutex_lock(&sessions_mutex
);
985 /* untrack all ids: replace by empty tracker. */
986 ret
= lttng_id_tracker_empty_set(tracker
);
988 ret
= lttng_id_tracker_del(tracker
, id
);
990 mutex_unlock(&sessions_mutex
);
995 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
997 struct lttng_id_tracker
*id_tracker
= m
->private;
998 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
999 struct lttng_id_hash_node
*e
;
1002 mutex_lock(&sessions_mutex
);
1004 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1005 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1007 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1013 /* ID tracker disabled. */
1014 if (iter
>= *pos
&& iter
== 0) {
1015 return id_tracker_p
; /* empty tracker */
1023 /* Called with sessions_mutex held. */
1025 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1027 struct lttng_id_tracker
*id_tracker
= m
->private;
1028 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1029 struct lttng_id_hash_node
*e
;
1034 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1035 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1037 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1038 if (iter
++ >= *ppos
)
1043 /* ID tracker disabled. */
1044 if (iter
>= *ppos
&& iter
== 0)
1045 return p
; /* empty tracker */
1054 void id_list_stop(struct seq_file
*m
, void *p
)
1056 mutex_unlock(&sessions_mutex
);
1060 int id_list_show(struct seq_file
*m
, void *p
)
1062 struct lttng_id_tracker
*id_tracker
= m
->private;
1063 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1066 if (p
== id_tracker_p
) {
1067 /* Tracker disabled. */
1070 const struct lttng_id_hash_node
*e
= p
;
1072 id
= lttng_id_tracker_get_node_id(e
);
1074 switch (id_tracker
->tracker_type
) {
1076 seq_printf(m
, "process { pid = %d; };\n", id
);
1079 seq_printf(m
, "process { vpid = %d; };\n", id
);
1082 seq_printf(m
, "user { uid = %d; };\n", id
);
1085 seq_printf(m
, "user { vuid = %d; };\n", id
);
1088 seq_printf(m
, "group { gid = %d; };\n", id
);
1091 seq_printf(m
, "group { vgid = %d; };\n", id
);
1094 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1100 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1101 .start
= id_list_start
,
1102 .next
= id_list_next
,
1103 .stop
= id_list_stop
,
1104 .show
= id_list_show
,
1108 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1110 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1114 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1116 struct seq_file
*m
= file
->private_data
;
1117 struct lttng_id_tracker
*id_tracker
= m
->private;
1120 WARN_ON_ONCE(!id_tracker
);
1121 ret
= seq_release(inode
, file
);
1123 fput(id_tracker
->session
->file
);
1127 const struct file_operations lttng_tracker_ids_list_fops
= {
1128 .owner
= THIS_MODULE
,
1129 .open
= lttng_tracker_ids_list_open
,
1131 .llseek
= seq_lseek
,
1132 .release
= lttng_tracker_ids_list_release
,
1135 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1136 enum tracker_type tracker_type
)
1138 struct file
*tracker_ids_list_file
;
1142 file_fd
= lttng_get_unused_fd();
1148 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1149 <tng_tracker_ids_list_fops
,
1151 if (IS_ERR(tracker_ids_list_file
)) {
1152 ret
= PTR_ERR(tracker_ids_list_file
);
1155 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1157 goto refcount_error
;
1159 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1162 m
= tracker_ids_list_file
->private_data
;
1164 m
->private = get_tracker(session
, tracker_type
);
1165 BUG_ON(!m
->private);
1166 fd_install(file_fd
, tracker_ids_list_file
);
1171 atomic_long_dec(&session
->file
->f_count
);
1173 fput(tracker_ids_list_file
);
1175 put_unused_fd(file_fd
);
1181 * Enabler management.
1184 int lttng_match_enabler_star_glob(const char *desc_name
,
1185 const char *pattern
)
1187 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1188 desc_name
, LTTNG_SIZE_MAX
))
1194 int lttng_match_enabler_name(const char *desc_name
,
1197 if (strcmp(desc_name
, name
))
1203 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1204 struct lttng_enabler
*enabler
)
1206 const char *desc_name
, *enabler_name
;
1208 enabler_name
= enabler
->event_param
.name
;
1209 switch (enabler
->event_param
.instrumentation
) {
1210 case LTTNG_KERNEL_TRACEPOINT
:
1211 desc_name
= desc
->name
;
1213 case LTTNG_KERNEL_SYSCALL
:
1214 desc_name
= desc
->name
;
1215 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1216 desc_name
+= strlen("compat_");
1217 if (!strncmp(desc_name
, "syscall_exit_",
1218 strlen("syscall_exit_"))) {
1219 desc_name
+= strlen("syscall_exit_");
1220 } else if (!strncmp(desc_name
, "syscall_entry_",
1221 strlen("syscall_entry_"))) {
1222 desc_name
+= strlen("syscall_entry_");
1232 switch (enabler
->type
) {
1233 case LTTNG_ENABLER_STAR_GLOB
:
1234 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1235 case LTTNG_ENABLER_NAME
:
1236 return lttng_match_enabler_name(desc_name
, enabler_name
);
1243 int lttng_event_match_enabler(struct lttng_event
*event
,
1244 struct lttng_enabler
*enabler
)
1246 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1248 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1249 && event
->chan
== enabler
->chan
)
1256 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1257 struct lttng_enabler
*enabler
)
1259 struct lttng_enabler_ref
*enabler_ref
;
1261 list_for_each_entry(enabler_ref
,
1262 &event
->enablers_ref_head
, node
) {
1263 if (enabler_ref
->ref
== enabler
)
1270 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1272 struct lttng_session
*session
= enabler
->chan
->session
;
1273 struct lttng_probe_desc
*probe_desc
;
1274 const struct lttng_event_desc
*desc
;
1276 struct list_head
*probe_list
;
1278 probe_list
= lttng_get_probe_list_head();
1280 * For each probe event, if we find that a probe event matches
1281 * our enabler, create an associated lttng_event if not
1284 list_for_each_entry(probe_desc
, probe_list
, head
) {
1285 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1287 struct hlist_head
*head
;
1288 const char *event_name
;
1291 struct lttng_event
*event
;
1293 desc
= probe_desc
->event_desc
[i
];
1294 if (!lttng_desc_match_enabler(desc
, enabler
))
1296 event_name
= desc
->name
;
1297 name_len
= strlen(event_name
);
1300 * Check if already created.
1302 hash
= jhash(event_name
, name_len
, 0);
1303 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1304 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1305 if (event
->desc
== desc
1306 && event
->chan
== enabler
->chan
)
1313 * We need to create an event for this
1316 event
= _lttng_event_create(enabler
->chan
,
1318 LTTNG_KERNEL_TRACEPOINT
);
1320 printk(KERN_INFO
"Unable to create event %s\n",
1321 probe_desc
->event_desc
[i
]->name
);
1328 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1332 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1337 * Create struct lttng_event if it is missing and present in the list of
1338 * tracepoint probes.
1339 * Should be called with sessions mutex held.
1342 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1344 switch (enabler
->event_param
.instrumentation
) {
1345 case LTTNG_KERNEL_TRACEPOINT
:
1346 lttng_create_tracepoint_if_missing(enabler
);
1348 case LTTNG_KERNEL_SYSCALL
:
1349 lttng_create_syscall_if_missing(enabler
);
1358 * Create events associated with an enabler (if not already present),
1359 * and add backward reference from the event to the enabler.
1360 * Should be called with sessions mutex held.
1363 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1365 struct lttng_session
*session
= enabler
->chan
->session
;
1366 struct lttng_event
*event
;
1368 /* First ensure that probe events are created for this enabler. */
1369 lttng_create_event_if_missing(enabler
);
1371 /* For each event matching enabler in session event list. */
1372 list_for_each_entry(event
, &session
->events
, list
) {
1373 struct lttng_enabler_ref
*enabler_ref
;
1375 if (!lttng_event_match_enabler(event
, enabler
))
1377 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1380 * If no backward ref, create it.
1381 * Add backward ref from event to enabler.
1383 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1386 enabler_ref
->ref
= enabler
;
1387 list_add(&enabler_ref
->node
,
1388 &event
->enablers_ref_head
);
1392 * Link filter bytecodes if not linked yet.
1394 lttng_enabler_event_link_bytecode(event
, enabler
);
1396 /* TODO: merge event context. */
1402 * Called at module load: connect the probe on all enablers matching
1404 * Called with sessions lock held.
1406 int lttng_fix_pending_events(void)
1408 struct lttng_session
*session
;
1410 list_for_each_entry(session
, &sessions
, list
)
1411 lttng_session_lazy_sync_enablers(session
);
1415 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1416 struct lttng_kernel_event
*event_param
,
1417 struct lttng_channel
*chan
)
1419 struct lttng_enabler
*enabler
;
1421 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1424 enabler
->type
= type
;
1425 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1426 memcpy(&enabler
->event_param
, event_param
,
1427 sizeof(enabler
->event_param
));
1428 enabler
->chan
= chan
;
1430 enabler
->enabled
= 0;
1431 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1432 mutex_lock(&sessions_mutex
);
1433 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1434 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1435 mutex_unlock(&sessions_mutex
);
1439 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1441 mutex_lock(&sessions_mutex
);
1442 enabler
->enabled
= 1;
1443 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1444 mutex_unlock(&sessions_mutex
);
1448 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1450 mutex_lock(&sessions_mutex
);
1451 enabler
->enabled
= 0;
1452 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1453 mutex_unlock(&sessions_mutex
);
1457 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1458 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1460 struct lttng_filter_bytecode_node
*bytecode_node
;
1461 uint32_t bytecode_len
;
1464 ret
= get_user(bytecode_len
, &bytecode
->len
);
1467 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1471 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1472 sizeof(*bytecode
) + bytecode_len
);
1475 bytecode_node
->enabler
= enabler
;
1476 /* Enforce length based on allocated size */
1477 bytecode_node
->bc
.len
= bytecode_len
;
1478 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1479 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1483 kfree(bytecode_node
);
1487 int lttng_event_add_callsite(struct lttng_event
*event
,
1488 struct lttng_kernel_event_callsite __user
*callsite
)
1491 switch (event
->instrumentation
) {
1492 case LTTNG_KERNEL_UPROBE
:
1493 return lttng_uprobes_add_callsite(event
, callsite
);
1499 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1500 struct lttng_kernel_context
*context_param
)
1506 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1508 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1510 /* Destroy filter bytecode */
1511 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1512 &enabler
->filter_bytecode_head
, node
) {
1516 /* Destroy contexts */
1517 lttng_destroy_context(enabler
->ctx
);
1519 list_del(&enabler
->node
);
1524 * lttng_session_sync_enablers should be called just before starting a
1526 * Should be called with sessions mutex held.
1529 void lttng_session_sync_enablers(struct lttng_session
*session
)
1531 struct lttng_enabler
*enabler
;
1532 struct lttng_event
*event
;
1534 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1535 lttng_enabler_ref_events(enabler
);
1537 * For each event, if at least one of its enablers is enabled,
1538 * and its channel and session transient states are enabled, we
1539 * enable the event, else we disable it.
1541 list_for_each_entry(event
, &session
->events
, list
) {
1542 struct lttng_enabler_ref
*enabler_ref
;
1543 struct lttng_bytecode_runtime
*runtime
;
1544 int enabled
= 0, has_enablers_without_bytecode
= 0;
1546 switch (event
->instrumentation
) {
1547 case LTTNG_KERNEL_TRACEPOINT
:
1548 case LTTNG_KERNEL_SYSCALL
:
1550 list_for_each_entry(enabler_ref
,
1551 &event
->enablers_ref_head
, node
) {
1552 if (enabler_ref
->ref
->enabled
) {
1559 /* Not handled with lazy sync. */
1563 * Enabled state is based on union of enablers, with
1564 * intesection of session and channel transient enable
1567 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1569 WRITE_ONCE(event
->enabled
, enabled
);
1571 * Sync tracepoint registration with event enabled
1575 register_event(event
);
1577 _lttng_event_unregister(event
);
1580 /* Check if has enablers without bytecode enabled */
1581 list_for_each_entry(enabler_ref
,
1582 &event
->enablers_ref_head
, node
) {
1583 if (enabler_ref
->ref
->enabled
1584 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1585 has_enablers_without_bytecode
= 1;
1589 event
->has_enablers_without_bytecode
=
1590 has_enablers_without_bytecode
;
1592 /* Enable filters */
1593 list_for_each_entry(runtime
,
1594 &event
->bytecode_runtime_head
, node
)
1595 lttng_filter_sync_state(runtime
);
1600 * Apply enablers to session events, adding events to session if need
1601 * be. It is required after each modification applied to an active
1602 * session, and right before session "start".
1603 * "lazy" sync means we only sync if required.
1604 * Should be called with sessions mutex held.
1607 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1609 /* We can skip if session is not active */
1610 if (!session
->active
)
1612 lttng_session_sync_enablers(session
);
1616 * Serialize at most one packet worth of metadata into a metadata
1618 * We grab the metadata cache mutex to get exclusive access to our metadata
1619 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1620 * allows us to do racy operations such as looking for remaining space left in
1621 * packet and write, since mutual exclusion protects us from concurrent writes.
1622 * Mutual exclusion on the metadata cache allow us to read the cache content
1623 * without racing against reallocation of the cache by updates.
1624 * Returns the number of bytes written in the channel, 0 if no data
1625 * was written and a negative value on error.
1627 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1628 struct channel
*chan
)
1630 struct lib_ring_buffer_ctx ctx
;
1632 size_t len
, reserve_len
;
1635 * Ensure we support mutiple get_next / put sequences followed by
1636 * put_next. The metadata cache lock protects reading the metadata
1637 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1638 * "flush" operations on the buffer invoked by different processes.
1639 * Moreover, since the metadata cache memory can be reallocated, we
1640 * need to have exclusive access against updates even though we only
1643 mutex_lock(&stream
->metadata_cache
->lock
);
1644 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1645 if (stream
->metadata_in
!= stream
->metadata_out
)
1648 /* Metadata regenerated, change the version. */
1649 if (stream
->metadata_cache
->version
!= stream
->version
)
1650 stream
->version
= stream
->metadata_cache
->version
;
1652 len
= stream
->metadata_cache
->metadata_written
-
1653 stream
->metadata_in
;
1656 reserve_len
= min_t(size_t,
1657 stream
->transport
->ops
.packet_avail_size(chan
),
1659 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1662 * If reservation failed, return an error to the caller.
1664 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1666 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1669 stream
->transport
->ops
.event_write(&ctx
,
1670 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1672 stream
->transport
->ops
.event_commit(&ctx
);
1673 stream
->metadata_in
+= reserve_len
;
1677 mutex_unlock(&stream
->metadata_cache
->lock
);
1682 * Write the metadata to the metadata cache.
1683 * Must be called with sessions_mutex held.
1684 * The metadata cache lock protects us from concurrent read access from
1685 * thread outputting metadata content to ring buffer.
1687 int lttng_metadata_printf(struct lttng_session
*session
,
1688 const char *fmt
, ...)
1693 struct lttng_metadata_stream
*stream
;
1695 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1698 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1704 mutex_lock(&session
->metadata_cache
->lock
);
1705 if (session
->metadata_cache
->metadata_written
+ len
>
1706 session
->metadata_cache
->cache_alloc
) {
1707 char *tmp_cache_realloc
;
1708 unsigned int tmp_cache_alloc_size
;
1710 tmp_cache_alloc_size
= max_t(unsigned int,
1711 session
->metadata_cache
->cache_alloc
+ len
,
1712 session
->metadata_cache
->cache_alloc
<< 1);
1713 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
1714 if (!tmp_cache_realloc
)
1716 if (session
->metadata_cache
->data
) {
1717 memcpy(tmp_cache_realloc
,
1718 session
->metadata_cache
->data
,
1719 session
->metadata_cache
->cache_alloc
);
1720 vfree(session
->metadata_cache
->data
);
1723 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1724 session
->metadata_cache
->data
= tmp_cache_realloc
;
1726 memcpy(session
->metadata_cache
->data
+
1727 session
->metadata_cache
->metadata_written
,
1729 session
->metadata_cache
->metadata_written
+= len
;
1730 mutex_unlock(&session
->metadata_cache
->lock
);
1733 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1734 wake_up_interruptible(&stream
->read_wait
);
1739 mutex_unlock(&session
->metadata_cache
->lock
);
1745 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1749 for (i
= 0; i
< nesting
; i
++) {
1752 ret
= lttng_metadata_printf(session
, " ");
1761 int lttng_field_name_statedump(struct lttng_session
*session
,
1762 const struct lttng_event_field
*field
,
1765 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
1769 int _lttng_integer_type_statedump(struct lttng_session
*session
,
1770 const struct lttng_type
*type
,
1775 WARN_ON_ONCE(type
->atype
!= atype_integer
);
1776 ret
= print_tabs(session
, nesting
);
1779 ret
= lttng_metadata_printf(session
,
1780 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
1781 type
->u
.integer
.size
,
1782 type
->u
.integer
.alignment
,
1783 type
->u
.integer
.signedness
,
1784 (type
->u
.integer
.encoding
== lttng_encode_none
)
1786 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
1789 type
->u
.integer
.base
,
1790 #if __BYTE_ORDER == __BIG_ENDIAN
1791 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
1793 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
1800 * Must be called with sessions_mutex held.
1803 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1804 const struct lttng_type
*type
,
1808 uint32_t i
, nr_fields
;
1809 unsigned int alignment
;
1811 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
1813 ret
= print_tabs(session
, nesting
);
1816 ret
= lttng_metadata_printf(session
,
1820 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
1821 for (i
= 0; i
< nr_fields
; i
++) {
1822 const struct lttng_event_field
*iter_field
;
1824 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
1825 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1829 ret
= print_tabs(session
, nesting
);
1832 alignment
= type
->u
.struct_nestable
.alignment
;
1834 ret
= lttng_metadata_printf(session
,
1838 ret
= lttng_metadata_printf(session
,
1845 * Must be called with sessions_mutex held.
1848 int _lttng_struct_field_statedump(struct lttng_session
*session
,
1849 const struct lttng_event_field
*field
,
1854 ret
= _lttng_struct_type_statedump(session
,
1855 &field
->type
, nesting
);
1858 return lttng_field_name_statedump(session
, field
, nesting
);
1862 * Must be called with sessions_mutex held.
1865 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1866 const struct lttng_type
*type
,
1870 uint32_t i
, nr_choices
;
1872 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
1874 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
1876 if (type
->u
.variant_nestable
.alignment
!= 0)
1878 ret
= print_tabs(session
, nesting
);
1881 ret
= lttng_metadata_printf(session
,
1882 "variant <_%s> {\n",
1883 type
->u
.variant_nestable
.tag_name
);
1886 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
1887 for (i
= 0; i
< nr_choices
; i
++) {
1888 const struct lttng_event_field
*iter_field
;
1890 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
1891 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1895 ret
= print_tabs(session
, nesting
);
1898 ret
= lttng_metadata_printf(session
,
1904 * Must be called with sessions_mutex held.
1907 int _lttng_variant_field_statedump(struct lttng_session
*session
,
1908 const struct lttng_event_field
*field
,
1913 ret
= _lttng_variant_type_statedump(session
,
1914 &field
->type
, nesting
);
1917 return lttng_field_name_statedump(session
, field
, nesting
);
1921 * Must be called with sessions_mutex held.
1924 int _lttng_array_field_statedump(struct lttng_session
*session
,
1925 const struct lttng_event_field
*field
,
1929 const struct lttng_type
*elem_type
;
1931 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
1933 if (field
->type
.u
.array_nestable
.alignment
) {
1934 ret
= print_tabs(session
, nesting
);
1937 ret
= lttng_metadata_printf(session
,
1938 "struct { } align(%u) _%s_padding;\n",
1939 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
1945 * Nested compound types: Only array of structures and variants are
1946 * currently supported.
1948 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
1949 switch (elem_type
->atype
) {
1951 case atype_struct_nestable
:
1952 case atype_variant_nestable
:
1953 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
1961 ret
= lttng_metadata_printf(session
,
1964 field
->type
.u
.array_nestable
.length
);
1969 * Must be called with sessions_mutex held.
1972 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
1973 const struct lttng_event_field
*field
,
1977 const char *length_name
;
1978 const struct lttng_type
*elem_type
;
1980 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
1982 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
1984 if (field
->type
.u
.sequence_nestable
.alignment
) {
1985 ret
= print_tabs(session
, nesting
);
1988 ret
= lttng_metadata_printf(session
,
1989 "struct { } align(%u) _%s_padding;\n",
1990 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
1997 * Nested compound types: Only array of structures and variants are
1998 * currently supported.
2000 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
2001 switch (elem_type
->atype
) {
2003 case atype_struct_nestable
:
2004 case atype_variant_nestable
:
2005 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2013 ret
= lttng_metadata_printf(session
,
2016 field
->type
.u
.sequence_nestable
.length_name
);
2021 * Must be called with sessions_mutex held.
2024 int _lttng_enum_type_statedump(struct lttng_session
*session
,
2025 const struct lttng_type
*type
,
2028 const struct lttng_enum_desc
*enum_desc
;
2029 const struct lttng_type
*container_type
;
2031 unsigned int i
, nr_entries
;
2033 container_type
= type
->u
.enum_nestable
.container_type
;
2034 if (container_type
->atype
!= atype_integer
) {
2038 enum_desc
= type
->u
.enum_nestable
.desc
;
2039 nr_entries
= enum_desc
->nr_entries
;
2041 ret
= print_tabs(session
, nesting
);
2044 ret
= lttng_metadata_printf(session
, "enum : ");
2047 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
2050 ret
= lttng_metadata_printf(session
, " {\n");
2053 /* Dump all entries */
2054 for (i
= 0; i
< nr_entries
; i
++) {
2055 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
2058 ret
= print_tabs(session
, nesting
+ 1);
2061 ret
= lttng_metadata_printf(session
,
2065 len
= strlen(entry
->string
);
2066 /* Escape the character '"' */
2067 for (j
= 0; j
< len
; j
++) {
2068 char c
= entry
->string
[j
];
2072 ret
= lttng_metadata_printf(session
,
2076 ret
= lttng_metadata_printf(session
,
2080 ret
= lttng_metadata_printf(session
,
2087 ret
= lttng_metadata_printf(session
, "\"");
2091 if (entry
->options
.is_auto
) {
2092 ret
= lttng_metadata_printf(session
, ",\n");
2096 ret
= lttng_metadata_printf(session
,
2100 if (entry
->start
.signedness
)
2101 ret
= lttng_metadata_printf(session
,
2102 "%lld", (long long) entry
->start
.value
);
2104 ret
= lttng_metadata_printf(session
,
2105 "%llu", entry
->start
.value
);
2108 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2110 == entry
->end
.value
) {
2111 ret
= lttng_metadata_printf(session
,
2114 if (entry
->end
.signedness
) {
2115 ret
= lttng_metadata_printf(session
,
2117 (long long) entry
->end
.value
);
2119 ret
= lttng_metadata_printf(session
,
2128 ret
= print_tabs(session
, nesting
);
2131 ret
= lttng_metadata_printf(session
, "}");
2137 * Must be called with sessions_mutex held.
2140 int _lttng_enum_field_statedump(struct lttng_session
*session
,
2141 const struct lttng_event_field
*field
,
2146 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
2149 return lttng_field_name_statedump(session
, field
, nesting
);
2153 int _lttng_integer_field_statedump(struct lttng_session
*session
,
2154 const struct lttng_event_field
*field
,
2159 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
2162 return lttng_field_name_statedump(session
, field
, nesting
);
2166 int _lttng_string_type_statedump(struct lttng_session
*session
,
2167 const struct lttng_type
*type
,
2172 WARN_ON_ONCE(type
->atype
!= atype_string
);
2173 /* Default encoding is UTF8 */
2174 ret
= print_tabs(session
, nesting
);
2177 ret
= lttng_metadata_printf(session
,
2179 type
->u
.string
.encoding
== lttng_encode_ASCII
?
2180 " { encoding = ASCII; }" : "");
2185 int _lttng_string_field_statedump(struct lttng_session
*session
,
2186 const struct lttng_event_field
*field
,
2191 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
2192 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
2195 return lttng_field_name_statedump(session
, field
, nesting
);
2199 * Must be called with sessions_mutex held.
2202 int _lttng_type_statedump(struct lttng_session
*session
,
2203 const struct lttng_type
*type
,
2208 switch (type
->atype
) {
2210 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
2212 case atype_enum_nestable
:
2213 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
2216 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
2218 case atype_struct_nestable
:
2219 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
2221 case atype_variant_nestable
:
2222 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
2225 /* Nested arrays and sequences are not supported yet. */
2226 case atype_array_nestable
:
2227 case atype_sequence_nestable
:
2236 * Must be called with sessions_mutex held.
2239 int _lttng_field_statedump(struct lttng_session
*session
,
2240 const struct lttng_event_field
*field
,
2245 switch (field
->type
.atype
) {
2247 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
2249 case atype_enum_nestable
:
2250 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
2253 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
2255 case atype_struct_nestable
:
2256 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
2258 case atype_array_nestable
:
2259 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
2261 case atype_sequence_nestable
:
2262 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
2264 case atype_variant_nestable
:
2265 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
2276 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2277 struct lttng_ctx
*ctx
)
2284 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2285 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2287 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2295 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2296 struct lttng_event
*event
)
2298 const struct lttng_event_desc
*desc
= event
->desc
;
2302 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2303 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2305 ret
= _lttng_field_statedump(session
, field
, 2);
2313 * Must be called with sessions_mutex held.
2316 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2317 struct lttng_channel
*chan
,
2318 struct lttng_event
*event
)
2322 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2324 if (chan
->channel_type
== METADATA_CHANNEL
)
2327 ret
= lttng_metadata_printf(session
,
2331 " stream_id = %u;\n",
2339 ret
= lttng_metadata_printf(session
,
2340 " context := struct {\n");
2344 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2348 ret
= lttng_metadata_printf(session
,
2354 ret
= lttng_metadata_printf(session
,
2355 " fields := struct {\n"
2360 ret
= _lttng_fields_metadata_statedump(session
, event
);
2365 * LTTng space reservation can only reserve multiples of the
2368 ret
= lttng_metadata_printf(session
,
2374 event
->metadata_dumped
= 1;
2381 * Must be called with sessions_mutex held.
2384 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2385 struct lttng_channel
*chan
)
2389 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2392 if (chan
->channel_type
== METADATA_CHANNEL
)
2395 WARN_ON_ONCE(!chan
->header_type
);
2396 ret
= lttng_metadata_printf(session
,
2399 " event.header := %s;\n"
2400 " packet.context := struct packet_context;\n",
2402 chan
->header_type
== 1 ? "struct event_header_compact" :
2403 "struct event_header_large");
2408 ret
= lttng_metadata_printf(session
,
2409 " event.context := struct {\n");
2413 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2417 ret
= lttng_metadata_printf(session
,
2423 ret
= lttng_metadata_printf(session
,
2426 chan
->metadata_dumped
= 1;
2432 * Must be called with sessions_mutex held.
2435 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2437 return lttng_metadata_printf(session
,
2438 "struct packet_context {\n"
2439 " uint64_clock_monotonic_t timestamp_begin;\n"
2440 " uint64_clock_monotonic_t timestamp_end;\n"
2441 " uint64_t content_size;\n"
2442 " uint64_t packet_size;\n"
2443 " uint64_t packet_seq_num;\n"
2444 " unsigned long events_discarded;\n"
2445 " uint32_t cpu_id;\n"
2452 * id: range: 0 - 30.
2453 * id 31 is reserved to indicate an extended header.
2456 * id: range: 0 - 65534.
2457 * id 65535 is reserved to indicate an extended header.
2459 * Must be called with sessions_mutex held.
2462 int _lttng_event_header_declare(struct lttng_session
*session
)
2464 return lttng_metadata_printf(session
,
2465 "struct event_header_compact {\n"
2466 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2469 " uint27_clock_monotonic_t timestamp;\n"
2473 " uint64_clock_monotonic_t timestamp;\n"
2478 "struct event_header_large {\n"
2479 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2482 " uint32_clock_monotonic_t timestamp;\n"
2486 " uint64_clock_monotonic_t timestamp;\n"
2490 lttng_alignof(uint32_t) * CHAR_BIT
,
2491 lttng_alignof(uint16_t) * CHAR_BIT
2496 * Approximation of NTP time of day to clock monotonic correlation,
2497 * taken at start of trace.
2498 * Yes, this is only an approximation. Yes, we can (and will) do better
2499 * in future versions.
2500 * This function may return a negative offset. It may happen if the
2501 * system sets the REALTIME clock to 0 after boot.
2503 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2507 int64_t measure_clock_offset(void)
2509 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2510 uint64_t tcf
= trace_clock_freq();
2512 unsigned long flags
;
2513 struct timespec64 rts
= { 0, 0 };
2515 /* Disable interrupts to increase correlation precision. */
2516 local_irq_save(flags
);
2517 monotonic
[0] = trace_clock_read64();
2518 ktime_get_real_ts64(&rts
);
2519 monotonic
[1] = trace_clock_read64();
2520 local_irq_restore(flags
);
2522 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2523 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2524 if (tcf
== NSEC_PER_SEC
) {
2525 realtime
+= rts
.tv_nsec
;
2527 uint64_t n
= rts
.tv_nsec
* tcf
;
2529 do_div(n
, NSEC_PER_SEC
);
2532 offset
= (int64_t) realtime
- monotonic_avg
;
2537 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
2545 while (cur
!= '\0') {
2548 ret
= lttng_metadata_printf(session
, "%s", "\\n");
2552 ret
= lttng_metadata_printf(session
, "%c", '\\');
2555 /* We still print the current char */
2558 ret
= lttng_metadata_printf(session
, "%c", cur
);
2572 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
2573 const char *field_value
)
2577 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
2581 ret
= print_escaped_ctf_string(session
, field_value
);
2585 ret
= lttng_metadata_printf(session
, "\";\n");
2592 * Output metadata into this session's metadata buffers.
2593 * Must be called with sessions_mutex held.
2596 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2598 unsigned char *uuid_c
= session
->uuid
.b
;
2599 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2600 const char *product_uuid
;
2601 struct lttng_channel
*chan
;
2602 struct lttng_event
*event
;
2605 if (!READ_ONCE(session
->active
))
2607 if (session
->metadata_dumped
)
2610 snprintf(uuid_s
, sizeof(uuid_s
),
2611 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2612 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2613 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2614 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2615 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2617 ret
= lttng_metadata_printf(session
,
2618 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2619 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2620 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2621 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2622 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2623 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2624 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2630 " byte_order = %s;\n"
2631 " packet.header := struct {\n"
2632 " uint32_t magic;\n"
2633 " uint8_t uuid[16];\n"
2634 " uint32_t stream_id;\n"
2635 " uint64_t stream_instance_id;\n"
2638 lttng_alignof(uint8_t) * CHAR_BIT
,
2639 lttng_alignof(uint16_t) * CHAR_BIT
,
2640 lttng_alignof(uint32_t) * CHAR_BIT
,
2641 lttng_alignof(uint64_t) * CHAR_BIT
,
2642 sizeof(unsigned long) * CHAR_BIT
,
2643 lttng_alignof(unsigned long) * CHAR_BIT
,
2647 #if __BYTE_ORDER == __BIG_ENDIAN
2656 ret
= lttng_metadata_printf(session
,
2658 " hostname = \"%s\";\n"
2659 " domain = \"kernel\";\n"
2660 " sysname = \"%s\";\n"
2661 " kernel_release = \"%s\";\n"
2662 " kernel_version = \"%s\";\n"
2663 " tracer_name = \"lttng-modules\";\n"
2664 " tracer_major = %d;\n"
2665 " tracer_minor = %d;\n"
2666 " tracer_patchlevel = %d;\n"
2667 " trace_buffering_scheme = \"global\";\n",
2668 current
->nsproxy
->uts_ns
->name
.nodename
,
2672 LTTNG_MODULES_MAJOR_VERSION
,
2673 LTTNG_MODULES_MINOR_VERSION
,
2674 LTTNG_MODULES_PATCHLEVEL_VERSION
2679 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
2682 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
2683 session
->creation_time
);
2687 /* Add the product UUID to the 'env' section */
2688 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
2690 ret
= lttng_metadata_printf(session
,
2691 " product_uuid = \"%s\";\n",
2698 /* Close the 'env' section */
2699 ret
= lttng_metadata_printf(session
, "};\n\n");
2703 ret
= lttng_metadata_printf(session
,
2705 " name = \"%s\";\n",
2711 if (!trace_clock_uuid(clock_uuid_s
)) {
2712 ret
= lttng_metadata_printf(session
,
2713 " uuid = \"%s\";\n",
2720 ret
= lttng_metadata_printf(session
,
2721 " description = \"%s\";\n"
2722 " freq = %llu; /* Frequency, in Hz */\n"
2723 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2726 trace_clock_description(),
2727 (unsigned long long) trace_clock_freq(),
2728 (long long) measure_clock_offset()
2733 ret
= lttng_metadata_printf(session
,
2734 "typealias integer {\n"
2735 " size = 27; align = 1; signed = false;\n"
2736 " map = clock.%s.value;\n"
2737 "} := uint27_clock_monotonic_t;\n"
2739 "typealias integer {\n"
2740 " size = 32; align = %u; signed = false;\n"
2741 " map = clock.%s.value;\n"
2742 "} := uint32_clock_monotonic_t;\n"
2744 "typealias integer {\n"
2745 " size = 64; align = %u; signed = false;\n"
2746 " map = clock.%s.value;\n"
2747 "} := uint64_clock_monotonic_t;\n\n",
2749 lttng_alignof(uint32_t) * CHAR_BIT
,
2751 lttng_alignof(uint64_t) * CHAR_BIT
,
2757 ret
= _lttng_stream_packet_context_declare(session
);
2761 ret
= _lttng_event_header_declare(session
);
2766 list_for_each_entry(chan
, &session
->chan
, list
) {
2767 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2772 list_for_each_entry(event
, &session
->events
, list
) {
2773 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2777 session
->metadata_dumped
= 1;
2783 * lttng_transport_register - LTT transport registration
2784 * @transport: transport structure
2786 * Registers a transport which can be used as output to extract the data out of
2789 void lttng_transport_register(struct lttng_transport
*transport
)
2791 mutex_lock(&sessions_mutex
);
2792 list_add_tail(&transport
->node
, <tng_transport_list
);
2793 mutex_unlock(&sessions_mutex
);
2795 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2798 * lttng_transport_unregister - LTT transport unregistration
2799 * @transport: transport structure
2801 void lttng_transport_unregister(struct lttng_transport
*transport
)
2803 mutex_lock(&sessions_mutex
);
2804 list_del(&transport
->node
);
2805 mutex_unlock(&sessions_mutex
);
2807 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2809 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2811 enum cpuhp_state lttng_hp_prepare
;
2812 enum cpuhp_state lttng_hp_online
;
2814 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2816 struct lttng_cpuhp_node
*lttng_node
;
2818 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2819 switch (lttng_node
->component
) {
2820 case LTTNG_RING_BUFFER_FRONTEND
:
2822 case LTTNG_RING_BUFFER_BACKEND
:
2823 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2824 case LTTNG_RING_BUFFER_ITER
:
2826 case LTTNG_CONTEXT_PERF_COUNTERS
:
2833 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2835 struct lttng_cpuhp_node
*lttng_node
;
2837 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2838 switch (lttng_node
->component
) {
2839 case LTTNG_RING_BUFFER_FRONTEND
:
2840 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2841 case LTTNG_RING_BUFFER_BACKEND
:
2843 case LTTNG_RING_BUFFER_ITER
:
2845 case LTTNG_CONTEXT_PERF_COUNTERS
:
2846 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2852 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2854 struct lttng_cpuhp_node
*lttng_node
;
2856 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2857 switch (lttng_node
->component
) {
2858 case LTTNG_RING_BUFFER_FRONTEND
:
2859 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2860 case LTTNG_RING_BUFFER_BACKEND
:
2862 case LTTNG_RING_BUFFER_ITER
:
2863 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2864 case LTTNG_CONTEXT_PERF_COUNTERS
:
2865 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2871 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2873 struct lttng_cpuhp_node
*lttng_node
;
2875 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2876 switch (lttng_node
->component
) {
2877 case LTTNG_RING_BUFFER_FRONTEND
:
2878 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2879 case LTTNG_RING_BUFFER_BACKEND
:
2881 case LTTNG_RING_BUFFER_ITER
:
2883 case LTTNG_CONTEXT_PERF_COUNTERS
:
2890 static int __init
lttng_init_cpu_hotplug(void)
2894 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2895 lttng_hotplug_prepare
,
2896 lttng_hotplug_dead
);
2900 lttng_hp_prepare
= ret
;
2901 lttng_rb_set_hp_prepare(ret
);
2903 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2904 lttng_hotplug_online
,
2905 lttng_hotplug_offline
);
2907 cpuhp_remove_multi_state(lttng_hp_prepare
);
2908 lttng_hp_prepare
= 0;
2911 lttng_hp_online
= ret
;
2912 lttng_rb_set_hp_online(ret
);
2917 static void __exit
lttng_exit_cpu_hotplug(void)
2919 lttng_rb_set_hp_online(0);
2920 cpuhp_remove_multi_state(lttng_hp_online
);
2921 lttng_rb_set_hp_prepare(0);
2922 cpuhp_remove_multi_state(lttng_hp_prepare
);
2925 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2926 static int lttng_init_cpu_hotplug(void)
2930 static void lttng_exit_cpu_hotplug(void)
2933 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2936 static int __init
lttng_events_init(void)
2940 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2943 ret
= wrapper_get_pfnblock_flags_mask_init();
2946 ret
= wrapper_get_pageblock_flags_mask_init();
2949 ret
= lttng_probes_init();
2952 ret
= lttng_context_init();
2955 ret
= lttng_tracepoint_init();
2958 event_cache
= KMEM_CACHE(lttng_event
, 0);
2963 ret
= lttng_abi_init();
2966 ret
= lttng_logger_init();
2969 ret
= lttng_init_cpu_hotplug();
2972 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2973 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2974 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2975 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2976 LTTNG_MODULES_EXTRAVERSION
,
2978 #ifdef LTTNG_EXTRA_VERSION_GIT
2979 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2983 #ifdef LTTNG_EXTRA_VERSION_NAME
2984 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2991 lttng_logger_exit();
2995 kmem_cache_destroy(event_cache
);
2997 lttng_tracepoint_exit();
2999 lttng_context_exit();
3000 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
3001 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3002 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3003 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3004 LTTNG_MODULES_EXTRAVERSION
,
3006 #ifdef LTTNG_EXTRA_VERSION_GIT
3007 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3011 #ifdef LTTNG_EXTRA_VERSION_NAME
3012 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3019 module_init(lttng_events_init
);
3021 static void __exit
lttng_events_exit(void)
3023 struct lttng_session
*session
, *tmpsession
;
3025 lttng_exit_cpu_hotplug();
3026 lttng_logger_exit();
3028 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
3029 lttng_session_destroy(session
);
3030 kmem_cache_destroy(event_cache
);
3031 lttng_tracepoint_exit();
3032 lttng_context_exit();
3033 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
3034 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3035 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3036 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3037 LTTNG_MODULES_EXTRAVERSION
,
3039 #ifdef LTTNG_EXTRA_VERSION_GIT
3040 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3044 #ifdef LTTNG_EXTRA_VERSION_NAME
3045 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3051 module_exit(lttng_events_exit
);
3053 #include "extra_version/patches.i"
3054 #ifdef LTTNG_EXTRA_VERSION_GIT
3055 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
3057 #ifdef LTTNG_EXTRA_VERSION_NAME
3058 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
3060 MODULE_LICENSE("GPL and additional rights");
3061 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3062 MODULE_DESCRIPTION("LTTng tracer");
3063 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
3064 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
3065 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
3066 LTTNG_MODULES_EXTRAVERSION
);