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 <wrapper/list.h>
29 #include <lttng-kernel-version.h>
30 #include <lttng-events.h>
31 #include <lttng-tracer.h>
32 #include <lttng-abi-old.h>
33 #include <lttng-endian.h>
34 #include <lttng-string-utils.h>
35 #include <lttng-tracepoint.h>
36 #include <wrapper/ringbuffer/backend.h>
37 #include <wrapper/ringbuffer/frontend.h>
39 #define METADATA_CACHE_DEFAULT_SIZE 4096
41 static LIST_HEAD(sessions
);
42 static LIST_HEAD(lttng_transport_list
);
44 * Protect the sessions and metadata caches.
46 static DEFINE_MUTEX(sessions_mutex
);
47 static struct kmem_cache
*event_cache
;
49 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
50 static void lttng_session_sync_enablers(struct lttng_session
*session
);
51 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
53 static void _lttng_event_destroy(struct lttng_event
*event
);
54 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
55 static int _lttng_event_unregister(struct lttng_event
*event
);
57 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
58 struct lttng_channel
*chan
,
59 struct lttng_event
*event
);
61 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
63 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
65 int _lttng_type_statedump(struct lttng_session
*session
,
66 const struct lttng_type
*type
,
69 int _lttng_field_statedump(struct lttng_session
*session
,
70 const struct lttng_event_field
*field
,
73 void synchronize_trace(void)
75 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
81 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
82 #ifdef CONFIG_PREEMPT_RT_FULL
85 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
86 #ifdef CONFIG_PREEMPT_RT
89 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
92 void lttng_lock_sessions(void)
94 mutex_lock(&sessions_mutex
);
97 void lttng_unlock_sessions(void)
99 mutex_unlock(&sessions_mutex
);
103 * Called with sessions lock held.
105 int lttng_session_active(void)
107 struct lttng_session
*iter
;
109 list_for_each_entry(iter
, &sessions
, list
) {
116 struct lttng_session
*lttng_session_create(void)
118 struct lttng_session
*session
;
119 struct lttng_metadata_cache
*metadata_cache
;
122 mutex_lock(&sessions_mutex
);
123 session
= kvzalloc_node(sizeof(struct lttng_session
), GFP_KERNEL
,
127 INIT_LIST_HEAD(&session
->chan
);
128 INIT_LIST_HEAD(&session
->events
);
129 guid_gen(&session
->uuid
);
131 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
134 goto err_free_session
;
135 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
136 if (!metadata_cache
->data
)
138 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
139 kref_init(&metadata_cache
->refcount
);
140 mutex_init(&metadata_cache
->lock
);
141 session
->metadata_cache
= metadata_cache
;
142 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
143 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
144 sizeof(metadata_cache
->uuid
));
145 INIT_LIST_HEAD(&session
->enablers_head
);
146 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
147 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
148 list_add(&session
->list
, &sessions
);
149 session
->pid_tracker
.session
= session
;
150 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
151 session
->vpid_tracker
.session
= session
;
152 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
153 session
->uid_tracker
.session
= session
;
154 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
155 session
->vuid_tracker
.session
= session
;
156 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
157 session
->gid_tracker
.session
= session
;
158 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
159 session
->vgid_tracker
.session
= session
;
160 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
161 mutex_unlock(&sessions_mutex
);
165 kfree(metadata_cache
);
169 mutex_unlock(&sessions_mutex
);
173 void metadata_cache_destroy(struct kref
*kref
)
175 struct lttng_metadata_cache
*cache
=
176 container_of(kref
, struct lttng_metadata_cache
, refcount
);
181 void lttng_session_destroy(struct lttng_session
*session
)
183 struct lttng_channel
*chan
, *tmpchan
;
184 struct lttng_event
*event
, *tmpevent
;
185 struct lttng_metadata_stream
*metadata_stream
;
186 struct lttng_enabler
*enabler
, *tmpenabler
;
189 mutex_lock(&sessions_mutex
);
190 WRITE_ONCE(session
->active
, 0);
191 list_for_each_entry(chan
, &session
->chan
, list
) {
192 ret
= lttng_syscalls_unregister(chan
);
195 list_for_each_entry(event
, &session
->events
, list
) {
196 ret
= _lttng_event_unregister(event
);
199 synchronize_trace(); /* Wait for in-flight events to complete */
200 list_for_each_entry_safe(enabler
, tmpenabler
,
201 &session
->enablers_head
, node
)
202 lttng_enabler_destroy(enabler
);
203 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
204 _lttng_event_destroy(event
);
205 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
206 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
207 _lttng_channel_destroy(chan
);
209 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
210 _lttng_metadata_channel_hangup(metadata_stream
);
211 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
212 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
213 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
214 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
215 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
216 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
217 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
218 list_del(&session
->list
);
219 mutex_unlock(&sessions_mutex
);
223 int lttng_session_statedump(struct lttng_session
*session
)
227 mutex_lock(&sessions_mutex
);
228 ret
= lttng_statedump_start(session
);
229 mutex_unlock(&sessions_mutex
);
233 int lttng_session_enable(struct lttng_session
*session
)
236 struct lttng_channel
*chan
;
238 mutex_lock(&sessions_mutex
);
239 if (session
->active
) {
244 /* Set transient enabler state to "enabled" */
247 /* We need to sync enablers with session before activation. */
248 lttng_session_sync_enablers(session
);
251 * Snapshot the number of events per channel to know the type of header
254 list_for_each_entry(chan
, &session
->chan
, list
) {
255 if (chan
->header_type
)
256 continue; /* don't change it if session stop/restart */
257 if (chan
->free_event_id
< 31)
258 chan
->header_type
= 1; /* compact */
260 chan
->header_type
= 2; /* large */
263 /* Clear each stream's quiescent state. */
264 list_for_each_entry(chan
, &session
->chan
, list
) {
265 if (chan
->channel_type
!= METADATA_CHANNEL
)
266 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
269 WRITE_ONCE(session
->active
, 1);
270 WRITE_ONCE(session
->been_active
, 1);
271 ret
= _lttng_session_metadata_statedump(session
);
273 WRITE_ONCE(session
->active
, 0);
276 ret
= lttng_statedump_start(session
);
278 WRITE_ONCE(session
->active
, 0);
280 mutex_unlock(&sessions_mutex
);
284 int lttng_session_disable(struct lttng_session
*session
)
287 struct lttng_channel
*chan
;
289 mutex_lock(&sessions_mutex
);
290 if (!session
->active
) {
294 WRITE_ONCE(session
->active
, 0);
296 /* Set transient enabler state to "disabled" */
298 lttng_session_sync_enablers(session
);
300 /* Set each stream's quiescent state. */
301 list_for_each_entry(chan
, &session
->chan
, list
) {
302 if (chan
->channel_type
!= METADATA_CHANNEL
)
303 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
306 mutex_unlock(&sessions_mutex
);
310 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
313 struct lttng_channel
*chan
;
314 struct lttng_event
*event
;
315 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
316 struct lttng_metadata_stream
*stream
;
318 mutex_lock(&sessions_mutex
);
319 if (!session
->active
) {
324 mutex_lock(&cache
->lock
);
325 memset(cache
->data
, 0, cache
->cache_alloc
);
326 cache
->metadata_written
= 0;
328 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
329 stream
->metadata_out
= 0;
330 stream
->metadata_in
= 0;
332 mutex_unlock(&cache
->lock
);
334 session
->metadata_dumped
= 0;
335 list_for_each_entry(chan
, &session
->chan
, list
) {
336 chan
->metadata_dumped
= 0;
339 list_for_each_entry(event
, &session
->events
, list
) {
340 event
->metadata_dumped
= 0;
343 ret
= _lttng_session_metadata_statedump(session
);
346 mutex_unlock(&sessions_mutex
);
350 int lttng_channel_enable(struct lttng_channel
*channel
)
354 mutex_lock(&sessions_mutex
);
355 if (channel
->channel_type
== METADATA_CHANNEL
) {
359 if (channel
->enabled
) {
363 /* Set transient enabler state to "enabled" */
365 lttng_session_sync_enablers(channel
->session
);
366 /* Set atomically the state to "enabled" */
367 WRITE_ONCE(channel
->enabled
, 1);
369 mutex_unlock(&sessions_mutex
);
373 int lttng_channel_disable(struct lttng_channel
*channel
)
377 mutex_lock(&sessions_mutex
);
378 if (channel
->channel_type
== METADATA_CHANNEL
) {
382 if (!channel
->enabled
) {
386 /* Set atomically the state to "disabled" */
387 WRITE_ONCE(channel
->enabled
, 0);
388 /* Set transient enabler state to "enabled" */
390 lttng_session_sync_enablers(channel
->session
);
392 mutex_unlock(&sessions_mutex
);
396 int lttng_event_enable(struct lttng_event
*event
)
400 mutex_lock(&sessions_mutex
);
401 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
405 if (event
->enabled
) {
409 switch (event
->instrumentation
) {
410 case LTTNG_KERNEL_TRACEPOINT
:
411 case LTTNG_KERNEL_SYSCALL
:
414 case LTTNG_KERNEL_KPROBE
:
415 case LTTNG_KERNEL_UPROBE
:
416 case LTTNG_KERNEL_NOOP
:
417 WRITE_ONCE(event
->enabled
, 1);
419 case LTTNG_KERNEL_KRETPROBE
:
420 ret
= lttng_kretprobes_event_enable_state(event
, 1);
422 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
428 mutex_unlock(&sessions_mutex
);
432 int lttng_event_disable(struct lttng_event
*event
)
436 mutex_lock(&sessions_mutex
);
437 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
441 if (!event
->enabled
) {
445 switch (event
->instrumentation
) {
446 case LTTNG_KERNEL_TRACEPOINT
:
447 case LTTNG_KERNEL_SYSCALL
:
450 case LTTNG_KERNEL_KPROBE
:
451 case LTTNG_KERNEL_UPROBE
:
452 case LTTNG_KERNEL_NOOP
:
453 WRITE_ONCE(event
->enabled
, 0);
455 case LTTNG_KERNEL_KRETPROBE
:
456 ret
= lttng_kretprobes_event_enable_state(event
, 0);
458 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
464 mutex_unlock(&sessions_mutex
);
468 static struct lttng_transport
*lttng_transport_find(const char *name
)
470 struct lttng_transport
*transport
;
472 list_for_each_entry(transport
, <tng_transport_list
, node
) {
473 if (!strcmp(transport
->name
, name
))
479 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
480 const char *transport_name
,
482 size_t subbuf_size
, size_t num_subbuf
,
483 unsigned int switch_timer_interval
,
484 unsigned int read_timer_interval
,
485 enum channel_type channel_type
)
487 struct lttng_channel
*chan
;
488 struct lttng_transport
*transport
= NULL
;
490 mutex_lock(&sessions_mutex
);
491 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
492 goto active
; /* Refuse to add channel to active session */
493 transport
= lttng_transport_find(transport_name
);
495 printk(KERN_WARNING
"LTTng transport %s not found\n",
499 if (!try_module_get(transport
->owner
)) {
500 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
503 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
506 chan
->session
= session
;
507 chan
->id
= session
->free_chan_id
++;
508 chan
->ops
= &transport
->ops
;
510 * Note: the channel creation op already writes into the packet
511 * headers. Therefore the "chan" information used as input
512 * should be already accessible.
514 chan
->chan
= transport
->ops
.channel_create(transport_name
,
515 chan
, buf_addr
, subbuf_size
, num_subbuf
,
516 switch_timer_interval
, read_timer_interval
);
521 chan
->transport
= transport
;
522 chan
->channel_type
= channel_type
;
523 list_add(&chan
->list
, &session
->chan
);
524 mutex_unlock(&sessions_mutex
);
531 module_put(transport
->owner
);
534 mutex_unlock(&sessions_mutex
);
539 * Only used internally at session destruction for per-cpu channels, and
540 * when metadata channel is released.
541 * Needs to be called with sessions mutex held.
544 void _lttng_channel_destroy(struct lttng_channel
*chan
)
546 chan
->ops
->channel_destroy(chan
->chan
);
547 module_put(chan
->transport
->owner
);
548 list_del(&chan
->list
);
549 lttng_destroy_context(chan
->ctx
);
553 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
555 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
557 /* Protect the metadata cache with the sessions_mutex. */
558 mutex_lock(&sessions_mutex
);
559 _lttng_channel_destroy(chan
);
560 mutex_unlock(&sessions_mutex
);
562 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
565 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
567 stream
->finalized
= 1;
568 wake_up_interruptible(&stream
->read_wait
);
572 * Supports event creation while tracing session is active.
573 * Needs to be called with sessions mutex held.
575 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
576 struct lttng_kernel_event
*event_param
,
578 const struct lttng_event_desc
*event_desc
,
579 enum lttng_kernel_instrumentation itype
)
581 struct lttng_session
*session
= chan
->session
;
582 struct lttng_event
*event
;
583 const char *event_name
;
584 struct hlist_head
*head
;
589 if (chan
->free_event_id
== -1U) {
595 case LTTNG_KERNEL_TRACEPOINT
:
596 event_name
= event_desc
->name
;
598 case LTTNG_KERNEL_KPROBE
:
599 case LTTNG_KERNEL_UPROBE
:
600 case LTTNG_KERNEL_KRETPROBE
:
601 case LTTNG_KERNEL_NOOP
:
602 case LTTNG_KERNEL_SYSCALL
:
603 event_name
= event_param
->name
;
605 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
611 name_len
= strlen(event_name
);
612 hash
= jhash(event_name
, name_len
, 0);
613 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
614 lttng_hlist_for_each_entry(event
, head
, hlist
) {
615 WARN_ON_ONCE(!event
->desc
);
616 if (!strncmp(event
->desc
->name
, event_name
,
617 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
618 && chan
== event
->chan
) {
624 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
630 event
->filter
= filter
;
631 event
->id
= chan
->free_event_id
++;
632 event
->instrumentation
= itype
;
633 event
->evtype
= LTTNG_TYPE_EVENT
;
634 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
635 INIT_LIST_HEAD(&event
->enablers_ref_head
);
638 case LTTNG_KERNEL_TRACEPOINT
:
639 /* Event will be enabled by enabler sync. */
641 event
->registered
= 0;
642 event
->desc
= lttng_event_get(event_name
);
647 /* Populate lttng_event structure before event registration. */
650 case LTTNG_KERNEL_KPROBE
:
652 * Needs to be explicitly enabled after creation, since
653 * we may want to apply filters.
656 event
->registered
= 1;
658 * Populate lttng_event structure before event
662 ret
= lttng_kprobes_register(event_name
,
663 event_param
->u
.kprobe
.symbol_name
,
664 event_param
->u
.kprobe
.offset
,
665 event_param
->u
.kprobe
.addr
,
671 ret
= try_module_get(event
->desc
->owner
);
674 case LTTNG_KERNEL_KRETPROBE
:
676 struct lttng_event
*event_return
;
678 /* kretprobe defines 2 events */
680 * Needs to be explicitly enabled after creation, since
681 * we may want to apply filters.
684 event
->registered
= 1;
686 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
691 event_return
->chan
= chan
;
692 event_return
->filter
= filter
;
693 event_return
->id
= chan
->free_event_id
++;
694 event_return
->enabled
= 0;
695 event_return
->registered
= 1;
696 event_return
->instrumentation
= itype
;
698 * Populate lttng_event structure before kretprobe registration.
701 ret
= lttng_kretprobes_register(event_name
,
702 event_param
->u
.kretprobe
.symbol_name
,
703 event_param
->u
.kretprobe
.offset
,
704 event_param
->u
.kretprobe
.addr
,
705 event
, event_return
);
707 kmem_cache_free(event_cache
, event_return
);
711 /* Take 2 refs on the module: one per event. */
712 ret
= try_module_get(event
->desc
->owner
);
714 ret
= try_module_get(event
->desc
->owner
);
716 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
718 WARN_ON_ONCE(ret
> 0);
720 kmem_cache_free(event_cache
, event_return
);
721 module_put(event
->desc
->owner
);
722 module_put(event
->desc
->owner
);
723 goto statedump_error
;
725 list_add(&event_return
->list
, &chan
->session
->events
);
728 case LTTNG_KERNEL_NOOP
:
729 case LTTNG_KERNEL_SYSCALL
:
731 * Needs to be explicitly enabled after creation, since
732 * we may want to apply filters.
735 event
->registered
= 0;
736 event
->desc
= event_desc
;
742 case LTTNG_KERNEL_UPROBE
:
744 * Needs to be explicitly enabled after creation, since
745 * we may want to apply filters.
748 event
->registered
= 1;
751 * Populate lttng_event structure before event
756 ret
= lttng_uprobes_register(event_param
->name
,
757 event_param
->u
.uprobe
.fd
,
761 ret
= try_module_get(event
->desc
->owner
);
764 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
770 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
771 WARN_ON_ONCE(ret
> 0);
773 goto statedump_error
;
775 hlist_add_head(&event
->hlist
, head
);
776 list_add(&event
->list
, &chan
->session
->events
);
780 /* If a statedump error occurs, events will not be readable. */
782 kmem_cache_free(event_cache
, event
);
790 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
791 struct lttng_kernel_event
*event_param
,
793 const struct lttng_event_desc
*event_desc
,
794 enum lttng_kernel_instrumentation itype
)
796 struct lttng_event
*event
;
798 mutex_lock(&sessions_mutex
);
799 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
801 mutex_unlock(&sessions_mutex
);
805 /* Only used for tracepoints for now. */
807 void register_event(struct lttng_event
*event
)
809 const struct lttng_event_desc
*desc
;
812 if (event
->registered
)
816 switch (event
->instrumentation
) {
817 case LTTNG_KERNEL_TRACEPOINT
:
818 ret
= lttng_tracepoint_probe_register(desc
->kname
,
819 desc
->probe_callback
,
822 case LTTNG_KERNEL_SYSCALL
:
823 ret
= lttng_syscall_filter_enable(event
->chan
,
826 case LTTNG_KERNEL_KPROBE
:
827 case LTTNG_KERNEL_UPROBE
:
828 case LTTNG_KERNEL_KRETPROBE
:
829 case LTTNG_KERNEL_NOOP
:
832 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
837 event
->registered
= 1;
841 * Only used internally at session destruction.
843 int _lttng_event_unregister(struct lttng_event
*event
)
845 const struct lttng_event_desc
*desc
;
848 if (!event
->registered
)
852 switch (event
->instrumentation
) {
853 case LTTNG_KERNEL_TRACEPOINT
:
854 ret
= lttng_tracepoint_probe_unregister(event
->desc
->kname
,
855 event
->desc
->probe_callback
,
858 case LTTNG_KERNEL_KPROBE
:
859 lttng_kprobes_unregister(event
);
862 case LTTNG_KERNEL_KRETPROBE
:
863 lttng_kretprobes_unregister(event
);
866 case LTTNG_KERNEL_SYSCALL
:
867 ret
= lttng_syscall_filter_disable(event
->chan
,
870 case LTTNG_KERNEL_NOOP
:
873 case LTTNG_KERNEL_UPROBE
:
874 lttng_uprobes_unregister(event
);
877 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
882 event
->registered
= 0;
887 * Only used internally at session destruction.
890 void _lttng_event_destroy(struct lttng_event
*event
)
892 switch (event
->instrumentation
) {
893 case LTTNG_KERNEL_TRACEPOINT
:
894 lttng_event_put(event
->desc
);
896 case LTTNG_KERNEL_KPROBE
:
897 module_put(event
->desc
->owner
);
898 lttng_kprobes_destroy_private(event
);
900 case LTTNG_KERNEL_KRETPROBE
:
901 module_put(event
->desc
->owner
);
902 lttng_kretprobes_destroy_private(event
);
904 case LTTNG_KERNEL_NOOP
:
905 case LTTNG_KERNEL_SYSCALL
:
907 case LTTNG_KERNEL_UPROBE
:
908 module_put(event
->desc
->owner
);
909 lttng_uprobes_destroy_private(event
);
911 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
915 list_del(&event
->list
);
916 lttng_destroy_context(event
->ctx
);
917 kmem_cache_free(event_cache
, event
);
920 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
921 enum tracker_type tracker_type
)
923 switch (tracker_type
) {
925 return &session
->pid_tracker
;
927 return &session
->vpid_tracker
;
929 return &session
->uid_tracker
;
931 return &session
->vuid_tracker
;
933 return &session
->gid_tracker
;
935 return &session
->vgid_tracker
;
942 int lttng_session_track_id(struct lttng_session
*session
,
943 enum tracker_type tracker_type
, int id
)
945 struct lttng_id_tracker
*tracker
;
948 tracker
= get_tracker(session
, tracker_type
);
953 mutex_lock(&sessions_mutex
);
955 /* track all ids: destroy tracker. */
956 lttng_id_tracker_destroy(tracker
, true);
959 ret
= lttng_id_tracker_add(tracker
, id
);
961 mutex_unlock(&sessions_mutex
);
965 int lttng_session_untrack_id(struct lttng_session
*session
,
966 enum tracker_type tracker_type
, int id
)
968 struct lttng_id_tracker
*tracker
;
971 tracker
= get_tracker(session
, tracker_type
);
976 mutex_lock(&sessions_mutex
);
978 /* untrack all ids: replace by empty tracker. */
979 ret
= lttng_id_tracker_empty_set(tracker
);
981 ret
= lttng_id_tracker_del(tracker
, id
);
983 mutex_unlock(&sessions_mutex
);
988 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
990 struct lttng_id_tracker
*id_tracker
= m
->private;
991 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
992 struct lttng_id_hash_node
*e
;
995 mutex_lock(&sessions_mutex
);
997 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
998 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1000 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1006 /* ID tracker disabled. */
1007 if (iter
>= *pos
&& iter
== 0) {
1008 return id_tracker_p
; /* empty tracker */
1016 /* Called with sessions_mutex held. */
1018 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1020 struct lttng_id_tracker
*id_tracker
= m
->private;
1021 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1022 struct lttng_id_hash_node
*e
;
1027 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1028 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1030 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1031 if (iter
++ >= *ppos
)
1036 /* ID tracker disabled. */
1037 if (iter
>= *ppos
&& iter
== 0)
1038 return p
; /* empty tracker */
1047 void id_list_stop(struct seq_file
*m
, void *p
)
1049 mutex_unlock(&sessions_mutex
);
1053 int id_list_show(struct seq_file
*m
, void *p
)
1055 struct lttng_id_tracker
*id_tracker
= m
->private;
1056 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1059 if (p
== id_tracker_p
) {
1060 /* Tracker disabled. */
1063 const struct lttng_id_hash_node
*e
= p
;
1065 id
= lttng_id_tracker_get_node_id(e
);
1067 switch (id_tracker
->tracker_type
) {
1069 seq_printf(m
, "process { pid = %d; };\n", id
);
1072 seq_printf(m
, "process { vpid = %d; };\n", id
);
1075 seq_printf(m
, "user { uid = %d; };\n", id
);
1078 seq_printf(m
, "user { vuid = %d; };\n", id
);
1081 seq_printf(m
, "group { gid = %d; };\n", id
);
1084 seq_printf(m
, "group { vgid = %d; };\n", id
);
1087 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1093 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1094 .start
= id_list_start
,
1095 .next
= id_list_next
,
1096 .stop
= id_list_stop
,
1097 .show
= id_list_show
,
1101 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1103 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1107 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1109 struct seq_file
*m
= file
->private_data
;
1110 struct lttng_id_tracker
*id_tracker
= m
->private;
1113 WARN_ON_ONCE(!id_tracker
);
1114 ret
= seq_release(inode
, file
);
1116 fput(id_tracker
->session
->file
);
1120 const struct file_operations lttng_tracker_ids_list_fops
= {
1121 .owner
= THIS_MODULE
,
1122 .open
= lttng_tracker_ids_list_open
,
1124 .llseek
= seq_lseek
,
1125 .release
= lttng_tracker_ids_list_release
,
1128 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1129 enum tracker_type tracker_type
)
1131 struct file
*tracker_ids_list_file
;
1135 file_fd
= get_unused_fd_flags(0);
1141 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1142 <tng_tracker_ids_list_fops
,
1144 if (IS_ERR(tracker_ids_list_file
)) {
1145 ret
= PTR_ERR(tracker_ids_list_file
);
1148 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1150 goto refcount_error
;
1152 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1155 m
= tracker_ids_list_file
->private_data
;
1157 m
->private = get_tracker(session
, tracker_type
);
1158 BUG_ON(!m
->private);
1159 fd_install(file_fd
, tracker_ids_list_file
);
1164 atomic_long_dec(&session
->file
->f_count
);
1166 fput(tracker_ids_list_file
);
1168 put_unused_fd(file_fd
);
1174 * Enabler management.
1177 int lttng_match_enabler_star_glob(const char *desc_name
,
1178 const char *pattern
)
1180 if (!strutils_star_glob_match(pattern
, SIZE_MAX
,
1181 desc_name
, SIZE_MAX
))
1187 int lttng_match_enabler_name(const char *desc_name
,
1190 if (strcmp(desc_name
, name
))
1196 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1197 struct lttng_enabler
*enabler
)
1199 const char *desc_name
, *enabler_name
;
1201 enabler_name
= enabler
->event_param
.name
;
1202 switch (enabler
->event_param
.instrumentation
) {
1203 case LTTNG_KERNEL_TRACEPOINT
:
1204 desc_name
= desc
->name
;
1206 case LTTNG_KERNEL_SYSCALL
:
1207 desc_name
= desc
->name
;
1208 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1209 desc_name
+= strlen("compat_");
1210 if (!strncmp(desc_name
, "syscall_exit_",
1211 strlen("syscall_exit_"))) {
1212 desc_name
+= strlen("syscall_exit_");
1213 } else if (!strncmp(desc_name
, "syscall_entry_",
1214 strlen("syscall_entry_"))) {
1215 desc_name
+= strlen("syscall_entry_");
1225 switch (enabler
->type
) {
1226 case LTTNG_ENABLER_STAR_GLOB
:
1227 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1228 case LTTNG_ENABLER_NAME
:
1229 return lttng_match_enabler_name(desc_name
, enabler_name
);
1236 int lttng_event_match_enabler(struct lttng_event
*event
,
1237 struct lttng_enabler
*enabler
)
1239 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1241 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1242 && event
->chan
== enabler
->chan
)
1249 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1250 struct lttng_enabler
*enabler
)
1252 struct lttng_enabler_ref
*enabler_ref
;
1254 list_for_each_entry(enabler_ref
,
1255 &event
->enablers_ref_head
, node
) {
1256 if (enabler_ref
->ref
== enabler
)
1263 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1265 struct lttng_session
*session
= enabler
->chan
->session
;
1266 struct lttng_probe_desc
*probe_desc
;
1267 const struct lttng_event_desc
*desc
;
1269 struct list_head
*probe_list
;
1271 probe_list
= lttng_get_probe_list_head();
1273 * For each probe event, if we find that a probe event matches
1274 * our enabler, create an associated lttng_event if not
1277 list_for_each_entry(probe_desc
, probe_list
, head
) {
1278 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1280 struct hlist_head
*head
;
1281 const char *event_name
;
1284 struct lttng_event
*event
;
1286 desc
= probe_desc
->event_desc
[i
];
1287 if (!lttng_desc_match_enabler(desc
, enabler
))
1289 event_name
= desc
->name
;
1290 name_len
= strlen(event_name
);
1293 * Check if already created.
1295 hash
= jhash(event_name
, name_len
, 0);
1296 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1297 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1298 if (event
->desc
== desc
1299 && event
->chan
== enabler
->chan
)
1306 * We need to create an event for this
1309 event
= _lttng_event_create(enabler
->chan
,
1311 LTTNG_KERNEL_TRACEPOINT
);
1313 printk(KERN_INFO
"Unable to create event %s\n",
1314 probe_desc
->event_desc
[i
]->name
);
1321 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1325 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1330 * Create struct lttng_event if it is missing and present in the list of
1331 * tracepoint probes.
1332 * Should be called with sessions mutex held.
1335 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1337 switch (enabler
->event_param
.instrumentation
) {
1338 case LTTNG_KERNEL_TRACEPOINT
:
1339 lttng_create_tracepoint_if_missing(enabler
);
1341 case LTTNG_KERNEL_SYSCALL
:
1342 lttng_create_syscall_if_missing(enabler
);
1351 * Create events associated with an enabler (if not already present),
1352 * and add backward reference from the event to the enabler.
1353 * Should be called with sessions mutex held.
1356 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1358 struct lttng_session
*session
= enabler
->chan
->session
;
1359 struct lttng_event
*event
;
1361 /* First ensure that probe events are created for this enabler. */
1362 lttng_create_event_if_missing(enabler
);
1364 /* For each event matching enabler in session event list. */
1365 list_for_each_entry(event
, &session
->events
, list
) {
1366 struct lttng_enabler_ref
*enabler_ref
;
1368 if (!lttng_event_match_enabler(event
, enabler
))
1370 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1373 * If no backward ref, create it.
1374 * Add backward ref from event to enabler.
1376 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1379 enabler_ref
->ref
= enabler
;
1380 list_add(&enabler_ref
->node
,
1381 &event
->enablers_ref_head
);
1385 * Link filter bytecodes if not linked yet.
1387 lttng_enabler_event_link_bytecode(event
, enabler
);
1389 /* TODO: merge event context. */
1395 * Called at module load: connect the probe on all enablers matching
1397 * Called with sessions lock held.
1399 int lttng_fix_pending_events(void)
1401 struct lttng_session
*session
;
1403 list_for_each_entry(session
, &sessions
, list
)
1404 lttng_session_lazy_sync_enablers(session
);
1408 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1409 struct lttng_kernel_event
*event_param
,
1410 struct lttng_channel
*chan
)
1412 struct lttng_enabler
*enabler
;
1414 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1417 enabler
->type
= type
;
1418 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1419 memcpy(&enabler
->event_param
, event_param
,
1420 sizeof(enabler
->event_param
));
1421 enabler
->chan
= chan
;
1423 enabler
->enabled
= 0;
1424 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1425 mutex_lock(&sessions_mutex
);
1426 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1427 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1428 mutex_unlock(&sessions_mutex
);
1432 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1434 mutex_lock(&sessions_mutex
);
1435 enabler
->enabled
= 1;
1436 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1437 mutex_unlock(&sessions_mutex
);
1441 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1443 mutex_lock(&sessions_mutex
);
1444 enabler
->enabled
= 0;
1445 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1446 mutex_unlock(&sessions_mutex
);
1450 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1451 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1453 struct lttng_filter_bytecode_node
*bytecode_node
;
1454 uint32_t bytecode_len
;
1457 ret
= get_user(bytecode_len
, &bytecode
->len
);
1460 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1464 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1465 sizeof(*bytecode
) + bytecode_len
);
1468 bytecode_node
->enabler
= enabler
;
1469 /* Enforce length based on allocated size */
1470 bytecode_node
->bc
.len
= bytecode_len
;
1471 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1472 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1476 kfree(bytecode_node
);
1480 int lttng_event_add_callsite(struct lttng_event
*event
,
1481 struct lttng_kernel_event_callsite __user
*callsite
)
1484 switch (event
->instrumentation
) {
1485 case LTTNG_KERNEL_UPROBE
:
1486 return lttng_uprobes_add_callsite(event
, callsite
);
1492 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1493 struct lttng_kernel_context
*context_param
)
1499 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1501 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1503 /* Destroy filter bytecode */
1504 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1505 &enabler
->filter_bytecode_head
, node
) {
1509 /* Destroy contexts */
1510 lttng_destroy_context(enabler
->ctx
);
1512 list_del(&enabler
->node
);
1517 * lttng_session_sync_enablers should be called just before starting a
1519 * Should be called with sessions mutex held.
1522 void lttng_session_sync_enablers(struct lttng_session
*session
)
1524 struct lttng_enabler
*enabler
;
1525 struct lttng_event
*event
;
1527 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1528 lttng_enabler_ref_events(enabler
);
1530 * For each event, if at least one of its enablers is enabled,
1531 * and its channel and session transient states are enabled, we
1532 * enable the event, else we disable it.
1534 list_for_each_entry(event
, &session
->events
, list
) {
1535 struct lttng_enabler_ref
*enabler_ref
;
1536 struct lttng_bytecode_runtime
*runtime
;
1537 int enabled
= 0, has_enablers_without_bytecode
= 0;
1539 switch (event
->instrumentation
) {
1540 case LTTNG_KERNEL_TRACEPOINT
:
1541 case LTTNG_KERNEL_SYSCALL
:
1543 list_for_each_entry(enabler_ref
,
1544 &event
->enablers_ref_head
, node
) {
1545 if (enabler_ref
->ref
->enabled
) {
1552 /* Not handled with lazy sync. */
1556 * Enabled state is based on union of enablers, with
1557 * intesection of session and channel transient enable
1560 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1562 WRITE_ONCE(event
->enabled
, enabled
);
1564 * Sync tracepoint registration with event enabled
1568 register_event(event
);
1570 _lttng_event_unregister(event
);
1573 /* Check if has enablers without bytecode enabled */
1574 list_for_each_entry(enabler_ref
,
1575 &event
->enablers_ref_head
, node
) {
1576 if (enabler_ref
->ref
->enabled
1577 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1578 has_enablers_without_bytecode
= 1;
1582 event
->has_enablers_without_bytecode
=
1583 has_enablers_without_bytecode
;
1585 /* Enable filters */
1586 list_for_each_entry(runtime
,
1587 &event
->bytecode_runtime_head
, node
)
1588 lttng_filter_sync_state(runtime
);
1593 * Apply enablers to session events, adding events to session if need
1594 * be. It is required after each modification applied to an active
1595 * session, and right before session "start".
1596 * "lazy" sync means we only sync if required.
1597 * Should be called with sessions mutex held.
1600 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1602 /* We can skip if session is not active */
1603 if (!session
->active
)
1605 lttng_session_sync_enablers(session
);
1609 * Serialize at most one packet worth of metadata into a metadata
1611 * We grab the metadata cache mutex to get exclusive access to our metadata
1612 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1613 * allows us to do racy operations such as looking for remaining space left in
1614 * packet and write, since mutual exclusion protects us from concurrent writes.
1615 * Mutual exclusion on the metadata cache allow us to read the cache content
1616 * without racing against reallocation of the cache by updates.
1617 * Returns the number of bytes written in the channel, 0 if no data
1618 * was written and a negative value on error.
1620 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1621 struct channel
*chan
)
1623 struct lib_ring_buffer_ctx ctx
;
1625 size_t len
, reserve_len
;
1628 * Ensure we support mutiple get_next / put sequences followed by
1629 * put_next. The metadata cache lock protects reading the metadata
1630 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1631 * "flush" operations on the buffer invoked by different processes.
1632 * Moreover, since the metadata cache memory can be reallocated, we
1633 * need to have exclusive access against updates even though we only
1636 mutex_lock(&stream
->metadata_cache
->lock
);
1637 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1638 if (stream
->metadata_in
!= stream
->metadata_out
)
1641 /* Metadata regenerated, change the version. */
1642 if (stream
->metadata_cache
->version
!= stream
->version
)
1643 stream
->version
= stream
->metadata_cache
->version
;
1645 len
= stream
->metadata_cache
->metadata_written
-
1646 stream
->metadata_in
;
1649 reserve_len
= min_t(size_t,
1650 stream
->transport
->ops
.packet_avail_size(chan
),
1652 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1655 * If reservation failed, return an error to the caller.
1657 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1659 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1662 stream
->transport
->ops
.event_write(&ctx
,
1663 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1665 stream
->transport
->ops
.event_commit(&ctx
);
1666 stream
->metadata_in
+= reserve_len
;
1670 mutex_unlock(&stream
->metadata_cache
->lock
);
1675 * Write the metadata to the metadata cache.
1676 * Must be called with sessions_mutex held.
1677 * The metadata cache lock protects us from concurrent read access from
1678 * thread outputting metadata content to ring buffer.
1680 int lttng_metadata_printf(struct lttng_session
*session
,
1681 const char *fmt
, ...)
1686 struct lttng_metadata_stream
*stream
;
1688 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1691 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1697 mutex_lock(&session
->metadata_cache
->lock
);
1698 if (session
->metadata_cache
->metadata_written
+ len
>
1699 session
->metadata_cache
->cache_alloc
) {
1700 char *tmp_cache_realloc
;
1701 unsigned int tmp_cache_alloc_size
;
1703 tmp_cache_alloc_size
= max_t(unsigned int,
1704 session
->metadata_cache
->cache_alloc
+ len
,
1705 session
->metadata_cache
->cache_alloc
<< 1);
1706 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
1707 if (!tmp_cache_realloc
)
1709 if (session
->metadata_cache
->data
) {
1710 memcpy(tmp_cache_realloc
,
1711 session
->metadata_cache
->data
,
1712 session
->metadata_cache
->cache_alloc
);
1713 vfree(session
->metadata_cache
->data
);
1716 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1717 session
->metadata_cache
->data
= tmp_cache_realloc
;
1719 memcpy(session
->metadata_cache
->data
+
1720 session
->metadata_cache
->metadata_written
,
1722 session
->metadata_cache
->metadata_written
+= len
;
1723 mutex_unlock(&session
->metadata_cache
->lock
);
1726 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1727 wake_up_interruptible(&stream
->read_wait
);
1732 mutex_unlock(&session
->metadata_cache
->lock
);
1738 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1742 for (i
= 0; i
< nesting
; i
++) {
1745 ret
= lttng_metadata_printf(session
, " ");
1754 int lttng_field_name_statedump(struct lttng_session
*session
,
1755 const struct lttng_event_field
*field
,
1758 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
1762 int _lttng_integer_type_statedump(struct lttng_session
*session
,
1763 const struct lttng_type
*type
,
1768 WARN_ON_ONCE(type
->atype
!= atype_integer
);
1769 ret
= print_tabs(session
, nesting
);
1772 ret
= lttng_metadata_printf(session
,
1773 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
1774 type
->u
.integer
.size
,
1775 type
->u
.integer
.alignment
,
1776 type
->u
.integer
.signedness
,
1777 (type
->u
.integer
.encoding
== lttng_encode_none
)
1779 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
1782 type
->u
.integer
.base
,
1783 #if __BYTE_ORDER == __BIG_ENDIAN
1784 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
1786 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
1793 * Must be called with sessions_mutex held.
1796 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1797 const struct lttng_type
*type
,
1801 uint32_t i
, nr_fields
;
1802 unsigned int alignment
;
1804 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
1806 ret
= print_tabs(session
, nesting
);
1809 ret
= lttng_metadata_printf(session
,
1813 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
1814 for (i
= 0; i
< nr_fields
; i
++) {
1815 const struct lttng_event_field
*iter_field
;
1817 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
1818 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1822 ret
= print_tabs(session
, nesting
);
1825 alignment
= type
->u
.struct_nestable
.alignment
;
1827 ret
= lttng_metadata_printf(session
,
1831 ret
= lttng_metadata_printf(session
,
1838 * Must be called with sessions_mutex held.
1841 int _lttng_struct_field_statedump(struct lttng_session
*session
,
1842 const struct lttng_event_field
*field
,
1847 ret
= _lttng_struct_type_statedump(session
,
1848 &field
->type
, nesting
);
1851 return lttng_field_name_statedump(session
, field
, nesting
);
1855 * Must be called with sessions_mutex held.
1858 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1859 const struct lttng_type
*type
,
1863 uint32_t i
, nr_choices
;
1865 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
1867 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
1869 if (type
->u
.variant_nestable
.alignment
!= 0)
1871 ret
= print_tabs(session
, nesting
);
1874 ret
= lttng_metadata_printf(session
,
1875 "variant <_%s> {\n",
1876 type
->u
.variant_nestable
.tag_name
);
1879 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
1880 for (i
= 0; i
< nr_choices
; i
++) {
1881 const struct lttng_event_field
*iter_field
;
1883 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
1884 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1888 ret
= print_tabs(session
, nesting
);
1891 ret
= lttng_metadata_printf(session
,
1897 * Must be called with sessions_mutex held.
1900 int _lttng_variant_field_statedump(struct lttng_session
*session
,
1901 const struct lttng_event_field
*field
,
1906 ret
= _lttng_variant_type_statedump(session
,
1907 &field
->type
, nesting
);
1910 return lttng_field_name_statedump(session
, field
, nesting
);
1914 * Must be called with sessions_mutex held.
1917 int _lttng_array_field_statedump(struct lttng_session
*session
,
1918 const struct lttng_event_field
*field
,
1922 const struct lttng_type
*elem_type
;
1924 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
1926 if (field
->type
.u
.array_nestable
.alignment
) {
1927 ret
= print_tabs(session
, nesting
);
1930 ret
= lttng_metadata_printf(session
,
1931 "struct { } align(%u) _%s_padding;\n",
1932 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
1938 * Nested compound types: Only array of structures and variants are
1939 * currently supported.
1941 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
1942 switch (elem_type
->atype
) {
1944 case atype_struct_nestable
:
1945 case atype_variant_nestable
:
1946 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
1954 ret
= lttng_metadata_printf(session
,
1957 field
->type
.u
.array_nestable
.length
);
1962 * Must be called with sessions_mutex held.
1965 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
1966 const struct lttng_event_field
*field
,
1970 const char *length_name
;
1971 const struct lttng_type
*elem_type
;
1973 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
1975 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
1977 if (field
->type
.u
.sequence_nestable
.alignment
) {
1978 ret
= print_tabs(session
, nesting
);
1981 ret
= lttng_metadata_printf(session
,
1982 "struct { } align(%u) _%s_padding;\n",
1983 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
1990 * Nested compound types: Only array of structures and variants are
1991 * currently supported.
1993 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
1994 switch (elem_type
->atype
) {
1996 case atype_struct_nestable
:
1997 case atype_variant_nestable
:
1998 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2006 ret
= lttng_metadata_printf(session
,
2009 field
->type
.u
.sequence_nestable
.length_name
);
2014 * Must be called with sessions_mutex held.
2017 int _lttng_enum_type_statedump(struct lttng_session
*session
,
2018 const struct lttng_type
*type
,
2021 const struct lttng_enum_desc
*enum_desc
;
2022 const struct lttng_type
*container_type
;
2024 unsigned int i
, nr_entries
;
2026 container_type
= type
->u
.enum_nestable
.container_type
;
2027 if (container_type
->atype
!= atype_integer
) {
2031 enum_desc
= type
->u
.enum_nestable
.desc
;
2032 nr_entries
= enum_desc
->nr_entries
;
2034 ret
= print_tabs(session
, nesting
);
2037 ret
= lttng_metadata_printf(session
, "enum : ");
2040 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
2043 ret
= lttng_metadata_printf(session
, " {\n");
2046 /* Dump all entries */
2047 for (i
= 0; i
< nr_entries
; i
++) {
2048 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
2051 ret
= print_tabs(session
, nesting
+ 1);
2054 ret
= lttng_metadata_printf(session
,
2058 len
= strlen(entry
->string
);
2059 /* Escape the character '"' */
2060 for (j
= 0; j
< len
; j
++) {
2061 char c
= entry
->string
[j
];
2065 ret
= lttng_metadata_printf(session
,
2069 ret
= lttng_metadata_printf(session
,
2073 ret
= lttng_metadata_printf(session
,
2080 ret
= lttng_metadata_printf(session
, "\"");
2084 if (entry
->options
.is_auto
) {
2085 ret
= lttng_metadata_printf(session
, ",\n");
2089 ret
= lttng_metadata_printf(session
,
2093 if (entry
->start
.signedness
)
2094 ret
= lttng_metadata_printf(session
,
2095 "%lld", (long long) entry
->start
.value
);
2097 ret
= lttng_metadata_printf(session
,
2098 "%llu", entry
->start
.value
);
2101 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2103 == entry
->end
.value
) {
2104 ret
= lttng_metadata_printf(session
,
2107 if (entry
->end
.signedness
) {
2108 ret
= lttng_metadata_printf(session
,
2110 (long long) entry
->end
.value
);
2112 ret
= lttng_metadata_printf(session
,
2121 ret
= print_tabs(session
, nesting
);
2124 ret
= lttng_metadata_printf(session
, "}");
2130 * Must be called with sessions_mutex held.
2133 int _lttng_enum_field_statedump(struct lttng_session
*session
,
2134 const struct lttng_event_field
*field
,
2139 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
2142 return lttng_field_name_statedump(session
, field
, nesting
);
2146 int _lttng_integer_field_statedump(struct lttng_session
*session
,
2147 const struct lttng_event_field
*field
,
2152 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
2155 return lttng_field_name_statedump(session
, field
, nesting
);
2159 int _lttng_string_type_statedump(struct lttng_session
*session
,
2160 const struct lttng_type
*type
,
2165 WARN_ON_ONCE(type
->atype
!= atype_string
);
2166 /* Default encoding is UTF8 */
2167 ret
= print_tabs(session
, nesting
);
2170 ret
= lttng_metadata_printf(session
,
2172 type
->u
.string
.encoding
== lttng_encode_ASCII
?
2173 " { encoding = ASCII; }" : "");
2178 int _lttng_string_field_statedump(struct lttng_session
*session
,
2179 const struct lttng_event_field
*field
,
2184 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
2185 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
2188 return lttng_field_name_statedump(session
, field
, nesting
);
2192 * Must be called with sessions_mutex held.
2195 int _lttng_type_statedump(struct lttng_session
*session
,
2196 const struct lttng_type
*type
,
2201 switch (type
->atype
) {
2203 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
2205 case atype_enum_nestable
:
2206 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
2209 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
2211 case atype_struct_nestable
:
2212 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
2214 case atype_variant_nestable
:
2215 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
2218 /* Nested arrays and sequences are not supported yet. */
2219 case atype_array_nestable
:
2220 case atype_sequence_nestable
:
2229 * Must be called with sessions_mutex held.
2232 int _lttng_field_statedump(struct lttng_session
*session
,
2233 const struct lttng_event_field
*field
,
2238 switch (field
->type
.atype
) {
2240 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
2242 case atype_enum_nestable
:
2243 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
2246 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
2248 case atype_struct_nestable
:
2249 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
2251 case atype_array_nestable
:
2252 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
2254 case atype_sequence_nestable
:
2255 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
2257 case atype_variant_nestable
:
2258 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
2269 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2270 struct lttng_ctx
*ctx
)
2277 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2278 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2280 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2288 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2289 struct lttng_event
*event
)
2291 const struct lttng_event_desc
*desc
= event
->desc
;
2295 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2296 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2298 ret
= _lttng_field_statedump(session
, field
, 2);
2306 * Must be called with sessions_mutex held.
2309 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2310 struct lttng_channel
*chan
,
2311 struct lttng_event
*event
)
2315 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2317 if (chan
->channel_type
== METADATA_CHANNEL
)
2320 ret
= lttng_metadata_printf(session
,
2324 " stream_id = %u;\n",
2332 ret
= lttng_metadata_printf(session
,
2333 " context := struct {\n");
2337 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2341 ret
= lttng_metadata_printf(session
,
2347 ret
= lttng_metadata_printf(session
,
2348 " fields := struct {\n"
2353 ret
= _lttng_fields_metadata_statedump(session
, event
);
2358 * LTTng space reservation can only reserve multiples of the
2361 ret
= lttng_metadata_printf(session
,
2367 event
->metadata_dumped
= 1;
2374 * Must be called with sessions_mutex held.
2377 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2378 struct lttng_channel
*chan
)
2382 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2385 if (chan
->channel_type
== METADATA_CHANNEL
)
2388 WARN_ON_ONCE(!chan
->header_type
);
2389 ret
= lttng_metadata_printf(session
,
2392 " event.header := %s;\n"
2393 " packet.context := struct packet_context;\n",
2395 chan
->header_type
== 1 ? "struct event_header_compact" :
2396 "struct event_header_large");
2401 ret
= lttng_metadata_printf(session
,
2402 " event.context := struct {\n");
2406 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2410 ret
= lttng_metadata_printf(session
,
2416 ret
= lttng_metadata_printf(session
,
2419 chan
->metadata_dumped
= 1;
2425 * Must be called with sessions_mutex held.
2428 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2430 return lttng_metadata_printf(session
,
2431 "struct packet_context {\n"
2432 " uint64_clock_monotonic_t timestamp_begin;\n"
2433 " uint64_clock_monotonic_t timestamp_end;\n"
2434 " uint64_t content_size;\n"
2435 " uint64_t packet_size;\n"
2436 " uint64_t packet_seq_num;\n"
2437 " unsigned long events_discarded;\n"
2438 " uint32_t cpu_id;\n"
2445 * id: range: 0 - 30.
2446 * id 31 is reserved to indicate an extended header.
2449 * id: range: 0 - 65534.
2450 * id 65535 is reserved to indicate an extended header.
2452 * Must be called with sessions_mutex held.
2455 int _lttng_event_header_declare(struct lttng_session
*session
)
2457 return lttng_metadata_printf(session
,
2458 "struct event_header_compact {\n"
2459 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2462 " uint27_clock_monotonic_t timestamp;\n"
2466 " uint64_clock_monotonic_t timestamp;\n"
2471 "struct event_header_large {\n"
2472 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2475 " uint32_clock_monotonic_t timestamp;\n"
2479 " uint64_clock_monotonic_t timestamp;\n"
2483 lttng_alignof(uint32_t) * CHAR_BIT
,
2484 lttng_alignof(uint16_t) * CHAR_BIT
2489 * Approximation of NTP time of day to clock monotonic correlation,
2490 * taken at start of trace.
2491 * Yes, this is only an approximation. Yes, we can (and will) do better
2492 * in future versions.
2493 * This function may return a negative offset. It may happen if the
2494 * system sets the REALTIME clock to 0 after boot.
2496 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2500 int64_t measure_clock_offset(void)
2502 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2503 uint64_t tcf
= trace_clock_freq();
2505 unsigned long flags
;
2506 struct timespec64 rts
= { 0, 0 };
2508 /* Disable interrupts to increase correlation precision. */
2509 local_irq_save(flags
);
2510 monotonic
[0] = trace_clock_read64();
2511 ktime_get_real_ts64(&rts
);
2512 monotonic
[1] = trace_clock_read64();
2513 local_irq_restore(flags
);
2515 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2516 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2517 if (tcf
== NSEC_PER_SEC
) {
2518 realtime
+= rts
.tv_nsec
;
2520 uint64_t n
= rts
.tv_nsec
* tcf
;
2522 do_div(n
, NSEC_PER_SEC
);
2525 offset
= (int64_t) realtime
- monotonic_avg
;
2530 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
2538 while (cur
!= '\0') {
2541 ret
= lttng_metadata_printf(session
, "%s", "\\n");
2545 ret
= lttng_metadata_printf(session
, "%c", '\\');
2548 /* We still print the current char */
2551 ret
= lttng_metadata_printf(session
, "%c", cur
);
2565 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
2566 const char *field_value
)
2570 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
2574 ret
= print_escaped_ctf_string(session
, field_value
);
2578 ret
= lttng_metadata_printf(session
, "\";\n");
2585 * Output metadata into this session's metadata buffers.
2586 * Must be called with sessions_mutex held.
2589 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2591 unsigned char *uuid_c
= session
->uuid
.b
;
2592 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2593 const char *product_uuid
;
2594 struct lttng_channel
*chan
;
2595 struct lttng_event
*event
;
2598 if (!READ_ONCE(session
->active
))
2600 if (session
->metadata_dumped
)
2603 snprintf(uuid_s
, sizeof(uuid_s
),
2604 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2605 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2606 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2607 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2608 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2610 ret
= lttng_metadata_printf(session
,
2611 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2612 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2613 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2614 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2615 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2616 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2617 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2623 " byte_order = %s;\n"
2624 " packet.header := struct {\n"
2625 " uint32_t magic;\n"
2626 " uint8_t uuid[16];\n"
2627 " uint32_t stream_id;\n"
2628 " uint64_t stream_instance_id;\n"
2631 lttng_alignof(uint8_t) * CHAR_BIT
,
2632 lttng_alignof(uint16_t) * CHAR_BIT
,
2633 lttng_alignof(uint32_t) * CHAR_BIT
,
2634 lttng_alignof(uint64_t) * CHAR_BIT
,
2635 sizeof(unsigned long) * CHAR_BIT
,
2636 lttng_alignof(unsigned long) * CHAR_BIT
,
2640 #if __BYTE_ORDER == __BIG_ENDIAN
2649 ret
= lttng_metadata_printf(session
,
2651 " hostname = \"%s\";\n"
2652 " domain = \"kernel\";\n"
2653 " sysname = \"%s\";\n"
2654 " kernel_release = \"%s\";\n"
2655 " kernel_version = \"%s\";\n"
2656 " tracer_name = \"lttng-modules\";\n"
2657 " tracer_major = %d;\n"
2658 " tracer_minor = %d;\n"
2659 " tracer_patchlevel = %d;\n"
2660 " trace_buffering_scheme = \"global\";\n",
2661 current
->nsproxy
->uts_ns
->name
.nodename
,
2665 LTTNG_MODULES_MAJOR_VERSION
,
2666 LTTNG_MODULES_MINOR_VERSION
,
2667 LTTNG_MODULES_PATCHLEVEL_VERSION
2672 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
2675 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
2676 session
->creation_time
);
2680 /* Add the product UUID to the 'env' section */
2681 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
2683 ret
= lttng_metadata_printf(session
,
2684 " product_uuid = \"%s\";\n",
2691 /* Close the 'env' section */
2692 ret
= lttng_metadata_printf(session
, "};\n\n");
2696 ret
= lttng_metadata_printf(session
,
2698 " name = \"%s\";\n",
2704 if (!trace_clock_uuid(clock_uuid_s
)) {
2705 ret
= lttng_metadata_printf(session
,
2706 " uuid = \"%s\";\n",
2713 ret
= lttng_metadata_printf(session
,
2714 " description = \"%s\";\n"
2715 " freq = %llu; /* Frequency, in Hz */\n"
2716 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2719 trace_clock_description(),
2720 (unsigned long long) trace_clock_freq(),
2721 (long long) measure_clock_offset()
2726 ret
= lttng_metadata_printf(session
,
2727 "typealias integer {\n"
2728 " size = 27; align = 1; signed = false;\n"
2729 " map = clock.%s.value;\n"
2730 "} := uint27_clock_monotonic_t;\n"
2732 "typealias integer {\n"
2733 " size = 32; align = %u; signed = false;\n"
2734 " map = clock.%s.value;\n"
2735 "} := uint32_clock_monotonic_t;\n"
2737 "typealias integer {\n"
2738 " size = 64; align = %u; signed = false;\n"
2739 " map = clock.%s.value;\n"
2740 "} := uint64_clock_monotonic_t;\n\n",
2742 lttng_alignof(uint32_t) * CHAR_BIT
,
2744 lttng_alignof(uint64_t) * CHAR_BIT
,
2750 ret
= _lttng_stream_packet_context_declare(session
);
2754 ret
= _lttng_event_header_declare(session
);
2759 list_for_each_entry(chan
, &session
->chan
, list
) {
2760 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2765 list_for_each_entry(event
, &session
->events
, list
) {
2766 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2770 session
->metadata_dumped
= 1;
2776 * lttng_transport_register - LTT transport registration
2777 * @transport: transport structure
2779 * Registers a transport which can be used as output to extract the data out of
2782 void lttng_transport_register(struct lttng_transport
*transport
)
2784 mutex_lock(&sessions_mutex
);
2785 list_add_tail(&transport
->node
, <tng_transport_list
);
2786 mutex_unlock(&sessions_mutex
);
2788 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2791 * lttng_transport_unregister - LTT transport unregistration
2792 * @transport: transport structure
2794 void lttng_transport_unregister(struct lttng_transport
*transport
)
2796 mutex_lock(&sessions_mutex
);
2797 list_del(&transport
->node
);
2798 mutex_unlock(&sessions_mutex
);
2800 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2802 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2804 enum cpuhp_state lttng_hp_prepare
;
2805 enum cpuhp_state lttng_hp_online
;
2807 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2809 struct lttng_cpuhp_node
*lttng_node
;
2811 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2812 switch (lttng_node
->component
) {
2813 case LTTNG_RING_BUFFER_FRONTEND
:
2815 case LTTNG_RING_BUFFER_BACKEND
:
2816 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2817 case LTTNG_RING_BUFFER_ITER
:
2819 case LTTNG_CONTEXT_PERF_COUNTERS
:
2826 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2828 struct lttng_cpuhp_node
*lttng_node
;
2830 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2831 switch (lttng_node
->component
) {
2832 case LTTNG_RING_BUFFER_FRONTEND
:
2833 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2834 case LTTNG_RING_BUFFER_BACKEND
:
2836 case LTTNG_RING_BUFFER_ITER
:
2838 case LTTNG_CONTEXT_PERF_COUNTERS
:
2839 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2845 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2847 struct lttng_cpuhp_node
*lttng_node
;
2849 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2850 switch (lttng_node
->component
) {
2851 case LTTNG_RING_BUFFER_FRONTEND
:
2852 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2853 case LTTNG_RING_BUFFER_BACKEND
:
2855 case LTTNG_RING_BUFFER_ITER
:
2856 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2857 case LTTNG_CONTEXT_PERF_COUNTERS
:
2858 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2864 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2866 struct lttng_cpuhp_node
*lttng_node
;
2868 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2869 switch (lttng_node
->component
) {
2870 case LTTNG_RING_BUFFER_FRONTEND
:
2871 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2872 case LTTNG_RING_BUFFER_BACKEND
:
2874 case LTTNG_RING_BUFFER_ITER
:
2876 case LTTNG_CONTEXT_PERF_COUNTERS
:
2883 static int __init
lttng_init_cpu_hotplug(void)
2887 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2888 lttng_hotplug_prepare
,
2889 lttng_hotplug_dead
);
2893 lttng_hp_prepare
= ret
;
2894 lttng_rb_set_hp_prepare(ret
);
2896 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2897 lttng_hotplug_online
,
2898 lttng_hotplug_offline
);
2900 cpuhp_remove_multi_state(lttng_hp_prepare
);
2901 lttng_hp_prepare
= 0;
2904 lttng_hp_online
= ret
;
2905 lttng_rb_set_hp_online(ret
);
2910 static void __exit
lttng_exit_cpu_hotplug(void)
2912 lttng_rb_set_hp_online(0);
2913 cpuhp_remove_multi_state(lttng_hp_online
);
2914 lttng_rb_set_hp_prepare(0);
2915 cpuhp_remove_multi_state(lttng_hp_prepare
);
2918 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2919 static int lttng_init_cpu_hotplug(void)
2923 static void lttng_exit_cpu_hotplug(void)
2926 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2929 static int __init
lttng_events_init(void)
2933 ret
= lttng_probes_init();
2936 ret
= lttng_context_init();
2939 ret
= lttng_tracepoint_init();
2942 event_cache
= KMEM_CACHE(lttng_event
, 0);
2947 ret
= lttng_abi_init();
2950 ret
= lttng_logger_init();
2953 ret
= lttng_init_cpu_hotplug();
2956 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2957 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2958 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2959 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2960 LTTNG_MODULES_EXTRAVERSION
,
2962 #ifdef LTTNG_EXTRA_VERSION_GIT
2963 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2967 #ifdef LTTNG_EXTRA_VERSION_NAME
2968 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2975 lttng_logger_exit();
2979 kmem_cache_destroy(event_cache
);
2981 lttng_tracepoint_exit();
2983 lttng_context_exit();
2984 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2985 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2986 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2987 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2988 LTTNG_MODULES_EXTRAVERSION
,
2990 #ifdef LTTNG_EXTRA_VERSION_GIT
2991 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2995 #ifdef LTTNG_EXTRA_VERSION_NAME
2996 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3003 module_init(lttng_events_init
);
3005 static void __exit
lttng_events_exit(void)
3007 struct lttng_session
*session
, *tmpsession
;
3009 lttng_exit_cpu_hotplug();
3010 lttng_logger_exit();
3012 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
3013 lttng_session_destroy(session
);
3014 kmem_cache_destroy(event_cache
);
3015 lttng_tracepoint_exit();
3016 lttng_context_exit();
3017 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
3018 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3019 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3020 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3021 LTTNG_MODULES_EXTRAVERSION
,
3023 #ifdef LTTNG_EXTRA_VERSION_GIT
3024 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3028 #ifdef LTTNG_EXTRA_VERSION_NAME
3029 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3035 module_exit(lttng_events_exit
);
3037 #include "extra_version/patches.i"
3038 #ifdef LTTNG_EXTRA_VERSION_GIT
3039 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
3041 #ifdef LTTNG_EXTRA_VERSION_NAME
3042 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
3044 MODULE_LICENSE("GPL and additional rights");
3045 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3046 MODULE_DESCRIPTION("LTTng tracer");
3047 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
3048 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
3049 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
3050 LTTNG_MODULES_EXTRAVERSION
);