1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/jiffies.h>
15 #include <linux/utsname.h>
16 #include <linux/err.h>
17 #include <linux/seq_file.h>
18 #include <linux/file.h>
19 #include <linux/anon_inodes.h>
20 #include <linux/jhash.h>
21 #include <linux/uaccess.h>
22 #include <linux/uuid.h>
23 #include <linux/dmi.h>
24 #include <linux/vmalloc.h>
25 #include <linux/limits.h>
27 #include <wrapper/random.h>
28 #include <lttng-kernel-version.h>
29 #include <lttng-events.h>
30 #include <lttng-tracer.h>
31 #include <lttng-abi-old.h>
32 #include <lttng-endian.h>
33 #include <lttng-string-utils.h>
34 #include <lttng-tracepoint.h>
35 #include <wrapper/ringbuffer/backend.h>
36 #include <wrapper/ringbuffer/frontend.h>
38 #define METADATA_CACHE_DEFAULT_SIZE 4096
40 static LIST_HEAD(sessions
);
41 static LIST_HEAD(lttng_transport_list
);
43 * Protect the sessions and metadata caches.
45 static DEFINE_MUTEX(sessions_mutex
);
46 static struct kmem_cache
*event_cache
;
48 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
49 static void lttng_session_sync_enablers(struct lttng_session
*session
);
50 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
52 static void _lttng_event_destroy(struct lttng_event
*event
);
53 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
54 static int _lttng_event_unregister(struct lttng_event
*event
);
56 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
57 struct lttng_channel
*chan
,
58 struct lttng_event
*event
);
60 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
62 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
64 int _lttng_type_statedump(struct lttng_session
*session
,
65 const struct lttng_type
*type
,
68 int _lttng_field_statedump(struct lttng_session
*session
,
69 const struct lttng_event_field
*field
,
72 void synchronize_trace(void)
74 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
80 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
81 #ifdef CONFIG_PREEMPT_RT_FULL
84 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
85 #ifdef CONFIG_PREEMPT_RT
88 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
91 void lttng_lock_sessions(void)
93 mutex_lock(&sessions_mutex
);
96 void lttng_unlock_sessions(void)
98 mutex_unlock(&sessions_mutex
);
102 * Called with sessions lock held.
104 int lttng_session_active(void)
106 struct lttng_session
*iter
;
108 list_for_each_entry(iter
, &sessions
, list
) {
115 struct lttng_session
*lttng_session_create(void)
117 struct lttng_session
*session
;
118 struct lttng_metadata_cache
*metadata_cache
;
121 mutex_lock(&sessions_mutex
);
122 session
= kvzalloc_node(sizeof(struct lttng_session
), GFP_KERNEL
,
126 INIT_LIST_HEAD(&session
->chan
);
127 INIT_LIST_HEAD(&session
->events
);
128 guid_gen(&session
->uuid
);
130 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
133 goto err_free_session
;
134 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
135 if (!metadata_cache
->data
)
137 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
138 kref_init(&metadata_cache
->refcount
);
139 mutex_init(&metadata_cache
->lock
);
140 session
->metadata_cache
= metadata_cache
;
141 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
142 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
143 sizeof(metadata_cache
->uuid
));
144 INIT_LIST_HEAD(&session
->enablers_head
);
145 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
146 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
147 list_add(&session
->list
, &sessions
);
148 session
->pid_tracker
.session
= session
;
149 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
150 session
->vpid_tracker
.session
= session
;
151 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
152 session
->uid_tracker
.session
= session
;
153 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
154 session
->vuid_tracker
.session
= session
;
155 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
156 session
->gid_tracker
.session
= session
;
157 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
158 session
->vgid_tracker
.session
= session
;
159 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
160 mutex_unlock(&sessions_mutex
);
164 kfree(metadata_cache
);
168 mutex_unlock(&sessions_mutex
);
172 void metadata_cache_destroy(struct kref
*kref
)
174 struct lttng_metadata_cache
*cache
=
175 container_of(kref
, struct lttng_metadata_cache
, refcount
);
180 void lttng_session_destroy(struct lttng_session
*session
)
182 struct lttng_channel
*chan
, *tmpchan
;
183 struct lttng_event
*event
, *tmpevent
;
184 struct lttng_metadata_stream
*metadata_stream
;
185 struct lttng_enabler
*enabler
, *tmpenabler
;
188 mutex_lock(&sessions_mutex
);
189 WRITE_ONCE(session
->active
, 0);
190 list_for_each_entry(chan
, &session
->chan
, list
) {
191 ret
= lttng_syscalls_unregister(chan
);
194 list_for_each_entry(event
, &session
->events
, list
) {
195 ret
= _lttng_event_unregister(event
);
198 synchronize_trace(); /* Wait for in-flight events to complete */
199 list_for_each_entry_safe(enabler
, tmpenabler
,
200 &session
->enablers_head
, node
)
201 lttng_enabler_destroy(enabler
);
202 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
203 _lttng_event_destroy(event
);
204 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
205 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
206 _lttng_channel_destroy(chan
);
208 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
209 _lttng_metadata_channel_hangup(metadata_stream
);
210 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
211 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
212 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
213 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
214 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
215 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
216 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
217 list_del(&session
->list
);
218 mutex_unlock(&sessions_mutex
);
222 int lttng_session_statedump(struct lttng_session
*session
)
226 mutex_lock(&sessions_mutex
);
227 ret
= lttng_statedump_start(session
);
228 mutex_unlock(&sessions_mutex
);
232 int lttng_session_enable(struct lttng_session
*session
)
235 struct lttng_channel
*chan
;
237 mutex_lock(&sessions_mutex
);
238 if (session
->active
) {
243 /* Set transient enabler state to "enabled" */
246 /* We need to sync enablers with session before activation. */
247 lttng_session_sync_enablers(session
);
250 * Snapshot the number of events per channel to know the type of header
253 list_for_each_entry(chan
, &session
->chan
, list
) {
254 if (chan
->header_type
)
255 continue; /* don't change it if session stop/restart */
256 if (chan
->free_event_id
< 31)
257 chan
->header_type
= 1; /* compact */
259 chan
->header_type
= 2; /* large */
262 /* Clear each stream's quiescent state. */
263 list_for_each_entry(chan
, &session
->chan
, list
) {
264 if (chan
->channel_type
!= METADATA_CHANNEL
)
265 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
268 WRITE_ONCE(session
->active
, 1);
269 WRITE_ONCE(session
->been_active
, 1);
270 ret
= _lttng_session_metadata_statedump(session
);
272 WRITE_ONCE(session
->active
, 0);
275 ret
= lttng_statedump_start(session
);
277 WRITE_ONCE(session
->active
, 0);
279 mutex_unlock(&sessions_mutex
);
283 int lttng_session_disable(struct lttng_session
*session
)
286 struct lttng_channel
*chan
;
288 mutex_lock(&sessions_mutex
);
289 if (!session
->active
) {
293 WRITE_ONCE(session
->active
, 0);
295 /* Set transient enabler state to "disabled" */
297 lttng_session_sync_enablers(session
);
299 /* Set each stream's quiescent state. */
300 list_for_each_entry(chan
, &session
->chan
, list
) {
301 if (chan
->channel_type
!= METADATA_CHANNEL
)
302 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
305 mutex_unlock(&sessions_mutex
);
309 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
312 struct lttng_channel
*chan
;
313 struct lttng_event
*event
;
314 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
315 struct lttng_metadata_stream
*stream
;
317 mutex_lock(&sessions_mutex
);
318 if (!session
->active
) {
323 mutex_lock(&cache
->lock
);
324 memset(cache
->data
, 0, cache
->cache_alloc
);
325 cache
->metadata_written
= 0;
327 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
328 stream
->metadata_out
= 0;
329 stream
->metadata_in
= 0;
331 mutex_unlock(&cache
->lock
);
333 session
->metadata_dumped
= 0;
334 list_for_each_entry(chan
, &session
->chan
, list
) {
335 chan
->metadata_dumped
= 0;
338 list_for_each_entry(event
, &session
->events
, list
) {
339 event
->metadata_dumped
= 0;
342 ret
= _lttng_session_metadata_statedump(session
);
345 mutex_unlock(&sessions_mutex
);
349 int lttng_channel_enable(struct lttng_channel
*channel
)
353 mutex_lock(&sessions_mutex
);
354 if (channel
->channel_type
== METADATA_CHANNEL
) {
358 if (channel
->enabled
) {
362 /* Set transient enabler state to "enabled" */
364 lttng_session_sync_enablers(channel
->session
);
365 /* Set atomically the state to "enabled" */
366 WRITE_ONCE(channel
->enabled
, 1);
368 mutex_unlock(&sessions_mutex
);
372 int lttng_channel_disable(struct lttng_channel
*channel
)
376 mutex_lock(&sessions_mutex
);
377 if (channel
->channel_type
== METADATA_CHANNEL
) {
381 if (!channel
->enabled
) {
385 /* Set atomically the state to "disabled" */
386 WRITE_ONCE(channel
->enabled
, 0);
387 /* Set transient enabler state to "enabled" */
389 lttng_session_sync_enablers(channel
->session
);
391 mutex_unlock(&sessions_mutex
);
395 int lttng_event_enable(struct lttng_event
*event
)
399 mutex_lock(&sessions_mutex
);
400 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
404 if (event
->enabled
) {
408 switch (event
->instrumentation
) {
409 case LTTNG_KERNEL_TRACEPOINT
:
410 case LTTNG_KERNEL_SYSCALL
:
413 case LTTNG_KERNEL_KPROBE
:
414 case LTTNG_KERNEL_UPROBE
:
415 case LTTNG_KERNEL_NOOP
:
416 WRITE_ONCE(event
->enabled
, 1);
418 case LTTNG_KERNEL_KRETPROBE
:
419 ret
= lttng_kretprobes_event_enable_state(event
, 1);
421 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
427 mutex_unlock(&sessions_mutex
);
431 int lttng_event_disable(struct lttng_event
*event
)
435 mutex_lock(&sessions_mutex
);
436 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
440 if (!event
->enabled
) {
444 switch (event
->instrumentation
) {
445 case LTTNG_KERNEL_TRACEPOINT
:
446 case LTTNG_KERNEL_SYSCALL
:
449 case LTTNG_KERNEL_KPROBE
:
450 case LTTNG_KERNEL_UPROBE
:
451 case LTTNG_KERNEL_NOOP
:
452 WRITE_ONCE(event
->enabled
, 0);
454 case LTTNG_KERNEL_KRETPROBE
:
455 ret
= lttng_kretprobes_event_enable_state(event
, 0);
457 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
463 mutex_unlock(&sessions_mutex
);
467 static struct lttng_transport
*lttng_transport_find(const char *name
)
469 struct lttng_transport
*transport
;
471 list_for_each_entry(transport
, <tng_transport_list
, node
) {
472 if (!strcmp(transport
->name
, name
))
478 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
479 const char *transport_name
,
481 size_t subbuf_size
, size_t num_subbuf
,
482 unsigned int switch_timer_interval
,
483 unsigned int read_timer_interval
,
484 enum channel_type channel_type
)
486 struct lttng_channel
*chan
;
487 struct lttng_transport
*transport
= NULL
;
489 mutex_lock(&sessions_mutex
);
490 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
491 goto active
; /* Refuse to add channel to active session */
492 transport
= lttng_transport_find(transport_name
);
494 printk(KERN_WARNING
"LTTng transport %s not found\n",
498 if (!try_module_get(transport
->owner
)) {
499 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
502 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
505 chan
->session
= session
;
506 chan
->id
= session
->free_chan_id
++;
507 chan
->ops
= &transport
->ops
;
509 * Note: the channel creation op already writes into the packet
510 * headers. Therefore the "chan" information used as input
511 * should be already accessible.
513 chan
->chan
= transport
->ops
.channel_create(transport_name
,
514 chan
, buf_addr
, subbuf_size
, num_subbuf
,
515 switch_timer_interval
, read_timer_interval
);
520 chan
->transport
= transport
;
521 chan
->channel_type
= channel_type
;
522 list_add(&chan
->list
, &session
->chan
);
523 mutex_unlock(&sessions_mutex
);
530 module_put(transport
->owner
);
533 mutex_unlock(&sessions_mutex
);
538 * Only used internally at session destruction for per-cpu channels, and
539 * when metadata channel is released.
540 * Needs to be called with sessions mutex held.
543 void _lttng_channel_destroy(struct lttng_channel
*chan
)
545 chan
->ops
->channel_destroy(chan
->chan
);
546 module_put(chan
->transport
->owner
);
547 list_del(&chan
->list
);
548 lttng_destroy_context(chan
->ctx
);
552 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
554 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
556 /* Protect the metadata cache with the sessions_mutex. */
557 mutex_lock(&sessions_mutex
);
558 _lttng_channel_destroy(chan
);
559 mutex_unlock(&sessions_mutex
);
561 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
564 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
566 stream
->finalized
= 1;
567 wake_up_interruptible(&stream
->read_wait
);
571 * Supports event creation while tracing session is active.
572 * Needs to be called with sessions mutex held.
574 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
575 struct lttng_kernel_event
*event_param
,
577 const struct lttng_event_desc
*event_desc
,
578 enum lttng_kernel_instrumentation itype
)
580 struct lttng_session
*session
= chan
->session
;
581 struct lttng_event
*event
;
582 const char *event_name
;
583 struct hlist_head
*head
;
588 if (chan
->free_event_id
== -1U) {
594 case LTTNG_KERNEL_TRACEPOINT
:
595 event_name
= event_desc
->name
;
597 case LTTNG_KERNEL_KPROBE
:
598 case LTTNG_KERNEL_UPROBE
:
599 case LTTNG_KERNEL_KRETPROBE
:
600 case LTTNG_KERNEL_NOOP
:
601 case LTTNG_KERNEL_SYSCALL
:
602 event_name
= event_param
->name
;
604 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
610 name_len
= strlen(event_name
);
611 hash
= jhash(event_name
, name_len
, 0);
612 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
613 hlist_for_each_entry(event
, head
, hlist
) {
614 WARN_ON_ONCE(!event
->desc
);
615 if (!strncmp(event
->desc
->name
, event_name
,
616 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
617 && chan
== event
->chan
) {
623 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
629 event
->filter
= filter
;
630 event
->id
= chan
->free_event_id
++;
631 event
->instrumentation
= itype
;
632 event
->evtype
= LTTNG_TYPE_EVENT
;
633 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
634 INIT_LIST_HEAD(&event
->enablers_ref_head
);
637 case LTTNG_KERNEL_TRACEPOINT
:
638 /* Event will be enabled by enabler sync. */
640 event
->registered
= 0;
641 event
->desc
= lttng_event_get(event_name
);
646 /* Populate lttng_event structure before event registration. */
649 case LTTNG_KERNEL_KPROBE
:
651 * Needs to be explicitly enabled after creation, since
652 * we may want to apply filters.
655 event
->registered
= 1;
657 * Populate lttng_event structure before event
661 ret
= lttng_kprobes_register(event_name
,
662 event_param
->u
.kprobe
.symbol_name
,
663 event_param
->u
.kprobe
.offset
,
664 event_param
->u
.kprobe
.addr
,
670 ret
= try_module_get(event
->desc
->owner
);
673 case LTTNG_KERNEL_KRETPROBE
:
675 struct lttng_event
*event_return
;
677 /* kretprobe defines 2 events */
679 * Needs to be explicitly enabled after creation, since
680 * we may want to apply filters.
683 event
->registered
= 1;
685 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
690 event_return
->chan
= chan
;
691 event_return
->filter
= filter
;
692 event_return
->id
= chan
->free_event_id
++;
693 event_return
->enabled
= 0;
694 event_return
->registered
= 1;
695 event_return
->instrumentation
= itype
;
697 * Populate lttng_event structure before kretprobe registration.
700 ret
= lttng_kretprobes_register(event_name
,
701 event_param
->u
.kretprobe
.symbol_name
,
702 event_param
->u
.kretprobe
.offset
,
703 event_param
->u
.kretprobe
.addr
,
704 event
, event_return
);
706 kmem_cache_free(event_cache
, event_return
);
710 /* Take 2 refs on the module: one per event. */
711 ret
= try_module_get(event
->desc
->owner
);
713 ret
= try_module_get(event
->desc
->owner
);
715 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
717 WARN_ON_ONCE(ret
> 0);
719 kmem_cache_free(event_cache
, event_return
);
720 module_put(event
->desc
->owner
);
721 module_put(event
->desc
->owner
);
722 goto statedump_error
;
724 list_add(&event_return
->list
, &chan
->session
->events
);
727 case LTTNG_KERNEL_NOOP
:
728 case LTTNG_KERNEL_SYSCALL
:
730 * Needs to be explicitly enabled after creation, since
731 * we may want to apply filters.
734 event
->registered
= 0;
735 event
->desc
= event_desc
;
741 case LTTNG_KERNEL_UPROBE
:
743 * Needs to be explicitly enabled after creation, since
744 * we may want to apply filters.
747 event
->registered
= 1;
750 * Populate lttng_event structure before event
755 ret
= lttng_uprobes_register(event_param
->name
,
756 event_param
->u
.uprobe
.fd
,
760 ret
= try_module_get(event
->desc
->owner
);
763 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
769 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
770 WARN_ON_ONCE(ret
> 0);
772 goto statedump_error
;
774 hlist_add_head(&event
->hlist
, head
);
775 list_add(&event
->list
, &chan
->session
->events
);
779 /* If a statedump error occurs, events will not be readable. */
781 kmem_cache_free(event_cache
, event
);
789 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
790 struct lttng_kernel_event
*event_param
,
792 const struct lttng_event_desc
*event_desc
,
793 enum lttng_kernel_instrumentation itype
)
795 struct lttng_event
*event
;
797 mutex_lock(&sessions_mutex
);
798 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
800 mutex_unlock(&sessions_mutex
);
804 /* Only used for tracepoints for now. */
806 void register_event(struct lttng_event
*event
)
808 const struct lttng_event_desc
*desc
;
811 if (event
->registered
)
815 switch (event
->instrumentation
) {
816 case LTTNG_KERNEL_TRACEPOINT
:
817 ret
= lttng_tracepoint_probe_register(desc
->kname
,
818 desc
->probe_callback
,
821 case LTTNG_KERNEL_SYSCALL
:
822 ret
= lttng_syscall_filter_enable(event
->chan
,
825 case LTTNG_KERNEL_KPROBE
:
826 case LTTNG_KERNEL_UPROBE
:
827 case LTTNG_KERNEL_KRETPROBE
:
828 case LTTNG_KERNEL_NOOP
:
831 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
836 event
->registered
= 1;
840 * Only used internally at session destruction.
842 int _lttng_event_unregister(struct lttng_event
*event
)
844 const struct lttng_event_desc
*desc
;
847 if (!event
->registered
)
851 switch (event
->instrumentation
) {
852 case LTTNG_KERNEL_TRACEPOINT
:
853 ret
= lttng_tracepoint_probe_unregister(event
->desc
->kname
,
854 event
->desc
->probe_callback
,
857 case LTTNG_KERNEL_KPROBE
:
858 lttng_kprobes_unregister(event
);
861 case LTTNG_KERNEL_KRETPROBE
:
862 lttng_kretprobes_unregister(event
);
865 case LTTNG_KERNEL_SYSCALL
:
866 ret
= lttng_syscall_filter_disable(event
->chan
,
869 case LTTNG_KERNEL_NOOP
:
872 case LTTNG_KERNEL_UPROBE
:
873 lttng_uprobes_unregister(event
);
876 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
881 event
->registered
= 0;
886 * Only used internally at session destruction.
889 void _lttng_event_destroy(struct lttng_event
*event
)
891 switch (event
->instrumentation
) {
892 case LTTNG_KERNEL_TRACEPOINT
:
893 lttng_event_put(event
->desc
);
895 case LTTNG_KERNEL_KPROBE
:
896 module_put(event
->desc
->owner
);
897 lttng_kprobes_destroy_private(event
);
899 case LTTNG_KERNEL_KRETPROBE
:
900 module_put(event
->desc
->owner
);
901 lttng_kretprobes_destroy_private(event
);
903 case LTTNG_KERNEL_NOOP
:
904 case LTTNG_KERNEL_SYSCALL
:
906 case LTTNG_KERNEL_UPROBE
:
907 module_put(event
->desc
->owner
);
908 lttng_uprobes_destroy_private(event
);
910 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
914 list_del(&event
->list
);
915 lttng_destroy_context(event
->ctx
);
916 kmem_cache_free(event_cache
, event
);
919 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
920 enum tracker_type tracker_type
)
922 switch (tracker_type
) {
924 return &session
->pid_tracker
;
926 return &session
->vpid_tracker
;
928 return &session
->uid_tracker
;
930 return &session
->vuid_tracker
;
932 return &session
->gid_tracker
;
934 return &session
->vgid_tracker
;
941 int lttng_session_track_id(struct lttng_session
*session
,
942 enum tracker_type tracker_type
, int id
)
944 struct lttng_id_tracker
*tracker
;
947 tracker
= get_tracker(session
, tracker_type
);
952 mutex_lock(&sessions_mutex
);
954 /* track all ids: destroy tracker. */
955 lttng_id_tracker_destroy(tracker
, true);
958 ret
= lttng_id_tracker_add(tracker
, id
);
960 mutex_unlock(&sessions_mutex
);
964 int lttng_session_untrack_id(struct lttng_session
*session
,
965 enum tracker_type tracker_type
, int id
)
967 struct lttng_id_tracker
*tracker
;
970 tracker
= get_tracker(session
, tracker_type
);
975 mutex_lock(&sessions_mutex
);
977 /* untrack all ids: replace by empty tracker. */
978 ret
= lttng_id_tracker_empty_set(tracker
);
980 ret
= lttng_id_tracker_del(tracker
, id
);
982 mutex_unlock(&sessions_mutex
);
987 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
989 struct lttng_id_tracker
*id_tracker
= m
->private;
990 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
991 struct lttng_id_hash_node
*e
;
994 mutex_lock(&sessions_mutex
);
996 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
997 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
999 hlist_for_each_entry(e
, head
, hlist
) {
1005 /* ID tracker disabled. */
1006 if (iter
>= *pos
&& iter
== 0) {
1007 return id_tracker_p
; /* empty tracker */
1015 /* Called with sessions_mutex held. */
1017 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1019 struct lttng_id_tracker
*id_tracker
= m
->private;
1020 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1021 struct lttng_id_hash_node
*e
;
1026 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1027 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1029 hlist_for_each_entry(e
, head
, hlist
) {
1030 if (iter
++ >= *ppos
)
1035 /* ID tracker disabled. */
1036 if (iter
>= *ppos
&& iter
== 0)
1037 return p
; /* empty tracker */
1046 void id_list_stop(struct seq_file
*m
, void *p
)
1048 mutex_unlock(&sessions_mutex
);
1052 int id_list_show(struct seq_file
*m
, void *p
)
1054 struct lttng_id_tracker
*id_tracker
= m
->private;
1055 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1058 if (p
== id_tracker_p
) {
1059 /* Tracker disabled. */
1062 const struct lttng_id_hash_node
*e
= p
;
1064 id
= lttng_id_tracker_get_node_id(e
);
1066 switch (id_tracker
->tracker_type
) {
1068 seq_printf(m
, "process { pid = %d; };\n", id
);
1071 seq_printf(m
, "process { vpid = %d; };\n", id
);
1074 seq_printf(m
, "user { uid = %d; };\n", id
);
1077 seq_printf(m
, "user { vuid = %d; };\n", id
);
1080 seq_printf(m
, "group { gid = %d; };\n", id
);
1083 seq_printf(m
, "group { vgid = %d; };\n", id
);
1086 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1092 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1093 .start
= id_list_start
,
1094 .next
= id_list_next
,
1095 .stop
= id_list_stop
,
1096 .show
= id_list_show
,
1100 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1102 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1106 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1108 struct seq_file
*m
= file
->private_data
;
1109 struct lttng_id_tracker
*id_tracker
= m
->private;
1112 WARN_ON_ONCE(!id_tracker
);
1113 ret
= seq_release(inode
, file
);
1115 fput(id_tracker
->session
->file
);
1119 const struct file_operations lttng_tracker_ids_list_fops
= {
1120 .owner
= THIS_MODULE
,
1121 .open
= lttng_tracker_ids_list_open
,
1123 .llseek
= seq_lseek
,
1124 .release
= lttng_tracker_ids_list_release
,
1127 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1128 enum tracker_type tracker_type
)
1130 struct file
*tracker_ids_list_file
;
1134 file_fd
= get_unused_fd_flags(0);
1140 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1141 <tng_tracker_ids_list_fops
,
1143 if (IS_ERR(tracker_ids_list_file
)) {
1144 ret
= PTR_ERR(tracker_ids_list_file
);
1147 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1149 goto refcount_error
;
1151 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1154 m
= tracker_ids_list_file
->private_data
;
1156 m
->private = get_tracker(session
, tracker_type
);
1157 BUG_ON(!m
->private);
1158 fd_install(file_fd
, tracker_ids_list_file
);
1163 atomic_long_dec(&session
->file
->f_count
);
1165 fput(tracker_ids_list_file
);
1167 put_unused_fd(file_fd
);
1173 * Enabler management.
1176 int lttng_match_enabler_star_glob(const char *desc_name
,
1177 const char *pattern
)
1179 if (!strutils_star_glob_match(pattern
, SIZE_MAX
,
1180 desc_name
, SIZE_MAX
))
1186 int lttng_match_enabler_name(const char *desc_name
,
1189 if (strcmp(desc_name
, name
))
1195 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1196 struct lttng_enabler
*enabler
)
1198 const char *desc_name
, *enabler_name
;
1200 enabler_name
= enabler
->event_param
.name
;
1201 switch (enabler
->event_param
.instrumentation
) {
1202 case LTTNG_KERNEL_TRACEPOINT
:
1203 desc_name
= desc
->name
;
1205 case LTTNG_KERNEL_SYSCALL
:
1206 desc_name
= desc
->name
;
1207 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1208 desc_name
+= strlen("compat_");
1209 if (!strncmp(desc_name
, "syscall_exit_",
1210 strlen("syscall_exit_"))) {
1211 desc_name
+= strlen("syscall_exit_");
1212 } else if (!strncmp(desc_name
, "syscall_entry_",
1213 strlen("syscall_entry_"))) {
1214 desc_name
+= strlen("syscall_entry_");
1224 switch (enabler
->type
) {
1225 case LTTNG_ENABLER_STAR_GLOB
:
1226 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1227 case LTTNG_ENABLER_NAME
:
1228 return lttng_match_enabler_name(desc_name
, enabler_name
);
1235 int lttng_event_match_enabler(struct lttng_event
*event
,
1236 struct lttng_enabler
*enabler
)
1238 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1240 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1241 && event
->chan
== enabler
->chan
)
1248 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1249 struct lttng_enabler
*enabler
)
1251 struct lttng_enabler_ref
*enabler_ref
;
1253 list_for_each_entry(enabler_ref
,
1254 &event
->enablers_ref_head
, node
) {
1255 if (enabler_ref
->ref
== enabler
)
1262 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1264 struct lttng_session
*session
= enabler
->chan
->session
;
1265 struct lttng_probe_desc
*probe_desc
;
1266 const struct lttng_event_desc
*desc
;
1268 struct list_head
*probe_list
;
1270 probe_list
= lttng_get_probe_list_head();
1272 * For each probe event, if we find that a probe event matches
1273 * our enabler, create an associated lttng_event if not
1276 list_for_each_entry(probe_desc
, probe_list
, head
) {
1277 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1279 struct hlist_head
*head
;
1280 const char *event_name
;
1283 struct lttng_event
*event
;
1285 desc
= probe_desc
->event_desc
[i
];
1286 if (!lttng_desc_match_enabler(desc
, enabler
))
1288 event_name
= desc
->name
;
1289 name_len
= strlen(event_name
);
1292 * Check if already created.
1294 hash
= jhash(event_name
, name_len
, 0);
1295 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1296 hlist_for_each_entry(event
, head
, hlist
) {
1297 if (event
->desc
== desc
1298 && event
->chan
== enabler
->chan
)
1305 * We need to create an event for this
1308 event
= _lttng_event_create(enabler
->chan
,
1310 LTTNG_KERNEL_TRACEPOINT
);
1312 printk(KERN_INFO
"Unable to create event %s\n",
1313 probe_desc
->event_desc
[i
]->name
);
1320 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1324 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1329 * Create struct lttng_event if it is missing and present in the list of
1330 * tracepoint probes.
1331 * Should be called with sessions mutex held.
1334 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1336 switch (enabler
->event_param
.instrumentation
) {
1337 case LTTNG_KERNEL_TRACEPOINT
:
1338 lttng_create_tracepoint_if_missing(enabler
);
1340 case LTTNG_KERNEL_SYSCALL
:
1341 lttng_create_syscall_if_missing(enabler
);
1350 * Create events associated with an enabler (if not already present),
1351 * and add backward reference from the event to the enabler.
1352 * Should be called with sessions mutex held.
1355 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1357 struct lttng_session
*session
= enabler
->chan
->session
;
1358 struct lttng_event
*event
;
1360 /* First ensure that probe events are created for this enabler. */
1361 lttng_create_event_if_missing(enabler
);
1363 /* For each event matching enabler in session event list. */
1364 list_for_each_entry(event
, &session
->events
, list
) {
1365 struct lttng_enabler_ref
*enabler_ref
;
1367 if (!lttng_event_match_enabler(event
, enabler
))
1369 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1372 * If no backward ref, create it.
1373 * Add backward ref from event to enabler.
1375 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1378 enabler_ref
->ref
= enabler
;
1379 list_add(&enabler_ref
->node
,
1380 &event
->enablers_ref_head
);
1384 * Link filter bytecodes if not linked yet.
1386 lttng_enabler_event_link_bytecode(event
, enabler
);
1388 /* TODO: merge event context. */
1394 * Called at module load: connect the probe on all enablers matching
1396 * Called with sessions lock held.
1398 int lttng_fix_pending_events(void)
1400 struct lttng_session
*session
;
1402 list_for_each_entry(session
, &sessions
, list
)
1403 lttng_session_lazy_sync_enablers(session
);
1407 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1408 struct lttng_kernel_event
*event_param
,
1409 struct lttng_channel
*chan
)
1411 struct lttng_enabler
*enabler
;
1413 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1416 enabler
->type
= type
;
1417 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1418 memcpy(&enabler
->event_param
, event_param
,
1419 sizeof(enabler
->event_param
));
1420 enabler
->chan
= chan
;
1422 enabler
->enabled
= 0;
1423 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1424 mutex_lock(&sessions_mutex
);
1425 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1426 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1427 mutex_unlock(&sessions_mutex
);
1431 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1433 mutex_lock(&sessions_mutex
);
1434 enabler
->enabled
= 1;
1435 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1436 mutex_unlock(&sessions_mutex
);
1440 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1442 mutex_lock(&sessions_mutex
);
1443 enabler
->enabled
= 0;
1444 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1445 mutex_unlock(&sessions_mutex
);
1449 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1450 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1452 struct lttng_filter_bytecode_node
*bytecode_node
;
1453 uint32_t bytecode_len
;
1456 ret
= get_user(bytecode_len
, &bytecode
->len
);
1459 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1463 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1464 sizeof(*bytecode
) + bytecode_len
);
1467 bytecode_node
->enabler
= enabler
;
1468 /* Enforce length based on allocated size */
1469 bytecode_node
->bc
.len
= bytecode_len
;
1470 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1471 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1475 kfree(bytecode_node
);
1479 int lttng_event_add_callsite(struct lttng_event
*event
,
1480 struct lttng_kernel_event_callsite __user
*callsite
)
1483 switch (event
->instrumentation
) {
1484 case LTTNG_KERNEL_UPROBE
:
1485 return lttng_uprobes_add_callsite(event
, callsite
);
1491 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1492 struct lttng_kernel_context
*context_param
)
1498 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1500 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1502 /* Destroy filter bytecode */
1503 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1504 &enabler
->filter_bytecode_head
, node
) {
1508 /* Destroy contexts */
1509 lttng_destroy_context(enabler
->ctx
);
1511 list_del(&enabler
->node
);
1516 * lttng_session_sync_enablers should be called just before starting a
1518 * Should be called with sessions mutex held.
1521 void lttng_session_sync_enablers(struct lttng_session
*session
)
1523 struct lttng_enabler
*enabler
;
1524 struct lttng_event
*event
;
1526 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1527 lttng_enabler_ref_events(enabler
);
1529 * For each event, if at least one of its enablers is enabled,
1530 * and its channel and session transient states are enabled, we
1531 * enable the event, else we disable it.
1533 list_for_each_entry(event
, &session
->events
, list
) {
1534 struct lttng_enabler_ref
*enabler_ref
;
1535 struct lttng_bytecode_runtime
*runtime
;
1536 int enabled
= 0, has_enablers_without_bytecode
= 0;
1538 switch (event
->instrumentation
) {
1539 case LTTNG_KERNEL_TRACEPOINT
:
1540 case LTTNG_KERNEL_SYSCALL
:
1542 list_for_each_entry(enabler_ref
,
1543 &event
->enablers_ref_head
, node
) {
1544 if (enabler_ref
->ref
->enabled
) {
1551 /* Not handled with lazy sync. */
1555 * Enabled state is based on union of enablers, with
1556 * intesection of session and channel transient enable
1559 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1561 WRITE_ONCE(event
->enabled
, enabled
);
1563 * Sync tracepoint registration with event enabled
1567 register_event(event
);
1569 _lttng_event_unregister(event
);
1572 /* Check if has enablers without bytecode enabled */
1573 list_for_each_entry(enabler_ref
,
1574 &event
->enablers_ref_head
, node
) {
1575 if (enabler_ref
->ref
->enabled
1576 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1577 has_enablers_without_bytecode
= 1;
1581 event
->has_enablers_without_bytecode
=
1582 has_enablers_without_bytecode
;
1584 /* Enable filters */
1585 list_for_each_entry(runtime
,
1586 &event
->bytecode_runtime_head
, node
)
1587 lttng_filter_sync_state(runtime
);
1592 * Apply enablers to session events, adding events to session if need
1593 * be. It is required after each modification applied to an active
1594 * session, and right before session "start".
1595 * "lazy" sync means we only sync if required.
1596 * Should be called with sessions mutex held.
1599 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1601 /* We can skip if session is not active */
1602 if (!session
->active
)
1604 lttng_session_sync_enablers(session
);
1608 * Serialize at most one packet worth of metadata into a metadata
1610 * We grab the metadata cache mutex to get exclusive access to our metadata
1611 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1612 * allows us to do racy operations such as looking for remaining space left in
1613 * packet and write, since mutual exclusion protects us from concurrent writes.
1614 * Mutual exclusion on the metadata cache allow us to read the cache content
1615 * without racing against reallocation of the cache by updates.
1616 * Returns the number of bytes written in the channel, 0 if no data
1617 * was written and a negative value on error.
1619 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1620 struct channel
*chan
)
1622 struct lib_ring_buffer_ctx ctx
;
1624 size_t len
, reserve_len
;
1627 * Ensure we support mutiple get_next / put sequences followed by
1628 * put_next. The metadata cache lock protects reading the metadata
1629 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1630 * "flush" operations on the buffer invoked by different processes.
1631 * Moreover, since the metadata cache memory can be reallocated, we
1632 * need to have exclusive access against updates even though we only
1635 mutex_lock(&stream
->metadata_cache
->lock
);
1636 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1637 if (stream
->metadata_in
!= stream
->metadata_out
)
1640 /* Metadata regenerated, change the version. */
1641 if (stream
->metadata_cache
->version
!= stream
->version
)
1642 stream
->version
= stream
->metadata_cache
->version
;
1644 len
= stream
->metadata_cache
->metadata_written
-
1645 stream
->metadata_in
;
1648 reserve_len
= min_t(size_t,
1649 stream
->transport
->ops
.packet_avail_size(chan
),
1651 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1654 * If reservation failed, return an error to the caller.
1656 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1658 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1661 stream
->transport
->ops
.event_write(&ctx
,
1662 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1664 stream
->transport
->ops
.event_commit(&ctx
);
1665 stream
->metadata_in
+= reserve_len
;
1669 mutex_unlock(&stream
->metadata_cache
->lock
);
1674 * Write the metadata to the metadata cache.
1675 * Must be called with sessions_mutex held.
1676 * The metadata cache lock protects us from concurrent read access from
1677 * thread outputting metadata content to ring buffer.
1679 int lttng_metadata_printf(struct lttng_session
*session
,
1680 const char *fmt
, ...)
1685 struct lttng_metadata_stream
*stream
;
1687 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1690 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1696 mutex_lock(&session
->metadata_cache
->lock
);
1697 if (session
->metadata_cache
->metadata_written
+ len
>
1698 session
->metadata_cache
->cache_alloc
) {
1699 char *tmp_cache_realloc
;
1700 unsigned int tmp_cache_alloc_size
;
1702 tmp_cache_alloc_size
= max_t(unsigned int,
1703 session
->metadata_cache
->cache_alloc
+ len
,
1704 session
->metadata_cache
->cache_alloc
<< 1);
1705 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
1706 if (!tmp_cache_realloc
)
1708 if (session
->metadata_cache
->data
) {
1709 memcpy(tmp_cache_realloc
,
1710 session
->metadata_cache
->data
,
1711 session
->metadata_cache
->cache_alloc
);
1712 vfree(session
->metadata_cache
->data
);
1715 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1716 session
->metadata_cache
->data
= tmp_cache_realloc
;
1718 memcpy(session
->metadata_cache
->data
+
1719 session
->metadata_cache
->metadata_written
,
1721 session
->metadata_cache
->metadata_written
+= len
;
1722 mutex_unlock(&session
->metadata_cache
->lock
);
1725 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1726 wake_up_interruptible(&stream
->read_wait
);
1731 mutex_unlock(&session
->metadata_cache
->lock
);
1737 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1741 for (i
= 0; i
< nesting
; i
++) {
1744 ret
= lttng_metadata_printf(session
, " ");
1753 int lttng_field_name_statedump(struct lttng_session
*session
,
1754 const struct lttng_event_field
*field
,
1757 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
1761 int _lttng_integer_type_statedump(struct lttng_session
*session
,
1762 const struct lttng_type
*type
,
1767 WARN_ON_ONCE(type
->atype
!= atype_integer
);
1768 ret
= print_tabs(session
, nesting
);
1771 ret
= lttng_metadata_printf(session
,
1772 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
1773 type
->u
.integer
.size
,
1774 type
->u
.integer
.alignment
,
1775 type
->u
.integer
.signedness
,
1776 (type
->u
.integer
.encoding
== lttng_encode_none
)
1778 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
1781 type
->u
.integer
.base
,
1782 #if __BYTE_ORDER == __BIG_ENDIAN
1783 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
1785 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
1792 * Must be called with sessions_mutex held.
1795 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1796 const struct lttng_type
*type
,
1800 uint32_t i
, nr_fields
;
1801 unsigned int alignment
;
1803 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
1805 ret
= print_tabs(session
, nesting
);
1808 ret
= lttng_metadata_printf(session
,
1812 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
1813 for (i
= 0; i
< nr_fields
; i
++) {
1814 const struct lttng_event_field
*iter_field
;
1816 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
1817 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1821 ret
= print_tabs(session
, nesting
);
1824 alignment
= type
->u
.struct_nestable
.alignment
;
1826 ret
= lttng_metadata_printf(session
,
1830 ret
= lttng_metadata_printf(session
,
1837 * Must be called with sessions_mutex held.
1840 int _lttng_struct_field_statedump(struct lttng_session
*session
,
1841 const struct lttng_event_field
*field
,
1846 ret
= _lttng_struct_type_statedump(session
,
1847 &field
->type
, nesting
);
1850 return lttng_field_name_statedump(session
, field
, nesting
);
1854 * Must be called with sessions_mutex held.
1857 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1858 const struct lttng_type
*type
,
1862 uint32_t i
, nr_choices
;
1864 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
1866 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
1868 if (type
->u
.variant_nestable
.alignment
!= 0)
1870 ret
= print_tabs(session
, nesting
);
1873 ret
= lttng_metadata_printf(session
,
1874 "variant <_%s> {\n",
1875 type
->u
.variant_nestable
.tag_name
);
1878 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
1879 for (i
= 0; i
< nr_choices
; i
++) {
1880 const struct lttng_event_field
*iter_field
;
1882 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
1883 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1887 ret
= print_tabs(session
, nesting
);
1890 ret
= lttng_metadata_printf(session
,
1896 * Must be called with sessions_mutex held.
1899 int _lttng_variant_field_statedump(struct lttng_session
*session
,
1900 const struct lttng_event_field
*field
,
1905 ret
= _lttng_variant_type_statedump(session
,
1906 &field
->type
, nesting
);
1909 return lttng_field_name_statedump(session
, field
, nesting
);
1913 * Must be called with sessions_mutex held.
1916 int _lttng_array_field_statedump(struct lttng_session
*session
,
1917 const struct lttng_event_field
*field
,
1921 const struct lttng_type
*elem_type
;
1923 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
1925 if (field
->type
.u
.array_nestable
.alignment
) {
1926 ret
= print_tabs(session
, nesting
);
1929 ret
= lttng_metadata_printf(session
,
1930 "struct { } align(%u) _%s_padding;\n",
1931 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
1937 * Nested compound types: Only array of structures and variants are
1938 * currently supported.
1940 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
1941 switch (elem_type
->atype
) {
1943 case atype_struct_nestable
:
1944 case atype_variant_nestable
:
1945 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
1953 ret
= lttng_metadata_printf(session
,
1956 field
->type
.u
.array_nestable
.length
);
1961 * Must be called with sessions_mutex held.
1964 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
1965 const struct lttng_event_field
*field
,
1969 const char *length_name
;
1970 const struct lttng_type
*elem_type
;
1972 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
1974 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
1976 if (field
->type
.u
.sequence_nestable
.alignment
) {
1977 ret
= print_tabs(session
, nesting
);
1980 ret
= lttng_metadata_printf(session
,
1981 "struct { } align(%u) _%s_padding;\n",
1982 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
1989 * Nested compound types: Only array of structures and variants are
1990 * currently supported.
1992 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
1993 switch (elem_type
->atype
) {
1995 case atype_struct_nestable
:
1996 case atype_variant_nestable
:
1997 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2005 ret
= lttng_metadata_printf(session
,
2008 field
->type
.u
.sequence_nestable
.length_name
);
2013 * Must be called with sessions_mutex held.
2016 int _lttng_enum_type_statedump(struct lttng_session
*session
,
2017 const struct lttng_type
*type
,
2020 const struct lttng_enum_desc
*enum_desc
;
2021 const struct lttng_type
*container_type
;
2023 unsigned int i
, nr_entries
;
2025 container_type
= type
->u
.enum_nestable
.container_type
;
2026 if (container_type
->atype
!= atype_integer
) {
2030 enum_desc
= type
->u
.enum_nestable
.desc
;
2031 nr_entries
= enum_desc
->nr_entries
;
2033 ret
= print_tabs(session
, nesting
);
2036 ret
= lttng_metadata_printf(session
, "enum : ");
2039 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
2042 ret
= lttng_metadata_printf(session
, " {\n");
2045 /* Dump all entries */
2046 for (i
= 0; i
< nr_entries
; i
++) {
2047 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
2050 ret
= print_tabs(session
, nesting
+ 1);
2053 ret
= lttng_metadata_printf(session
,
2057 len
= strlen(entry
->string
);
2058 /* Escape the character '"' */
2059 for (j
= 0; j
< len
; j
++) {
2060 char c
= entry
->string
[j
];
2064 ret
= lttng_metadata_printf(session
,
2068 ret
= lttng_metadata_printf(session
,
2072 ret
= lttng_metadata_printf(session
,
2079 ret
= lttng_metadata_printf(session
, "\"");
2083 if (entry
->options
.is_auto
) {
2084 ret
= lttng_metadata_printf(session
, ",\n");
2088 ret
= lttng_metadata_printf(session
,
2092 if (entry
->start
.signedness
)
2093 ret
= lttng_metadata_printf(session
,
2094 "%lld", (long long) entry
->start
.value
);
2096 ret
= lttng_metadata_printf(session
,
2097 "%llu", entry
->start
.value
);
2100 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2102 == entry
->end
.value
) {
2103 ret
= lttng_metadata_printf(session
,
2106 if (entry
->end
.signedness
) {
2107 ret
= lttng_metadata_printf(session
,
2109 (long long) entry
->end
.value
);
2111 ret
= lttng_metadata_printf(session
,
2120 ret
= print_tabs(session
, nesting
);
2123 ret
= lttng_metadata_printf(session
, "}");
2129 * Must be called with sessions_mutex held.
2132 int _lttng_enum_field_statedump(struct lttng_session
*session
,
2133 const struct lttng_event_field
*field
,
2138 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
2141 return lttng_field_name_statedump(session
, field
, nesting
);
2145 int _lttng_integer_field_statedump(struct lttng_session
*session
,
2146 const struct lttng_event_field
*field
,
2151 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
2154 return lttng_field_name_statedump(session
, field
, nesting
);
2158 int _lttng_string_type_statedump(struct lttng_session
*session
,
2159 const struct lttng_type
*type
,
2164 WARN_ON_ONCE(type
->atype
!= atype_string
);
2165 /* Default encoding is UTF8 */
2166 ret
= print_tabs(session
, nesting
);
2169 ret
= lttng_metadata_printf(session
,
2171 type
->u
.string
.encoding
== lttng_encode_ASCII
?
2172 " { encoding = ASCII; }" : "");
2177 int _lttng_string_field_statedump(struct lttng_session
*session
,
2178 const struct lttng_event_field
*field
,
2183 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
2184 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
2187 return lttng_field_name_statedump(session
, field
, nesting
);
2191 * Must be called with sessions_mutex held.
2194 int _lttng_type_statedump(struct lttng_session
*session
,
2195 const struct lttng_type
*type
,
2200 switch (type
->atype
) {
2202 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
2204 case atype_enum_nestable
:
2205 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
2208 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
2210 case atype_struct_nestable
:
2211 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
2213 case atype_variant_nestable
:
2214 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
2217 /* Nested arrays and sequences are not supported yet. */
2218 case atype_array_nestable
:
2219 case atype_sequence_nestable
:
2228 * Must be called with sessions_mutex held.
2231 int _lttng_field_statedump(struct lttng_session
*session
,
2232 const struct lttng_event_field
*field
,
2237 switch (field
->type
.atype
) {
2239 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
2241 case atype_enum_nestable
:
2242 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
2245 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
2247 case atype_struct_nestable
:
2248 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
2250 case atype_array_nestable
:
2251 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
2253 case atype_sequence_nestable
:
2254 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
2256 case atype_variant_nestable
:
2257 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
2268 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2269 struct lttng_ctx
*ctx
)
2276 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2277 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2279 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2287 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2288 struct lttng_event
*event
)
2290 const struct lttng_event_desc
*desc
= event
->desc
;
2294 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2295 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2297 ret
= _lttng_field_statedump(session
, field
, 2);
2305 * Must be called with sessions_mutex held.
2308 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2309 struct lttng_channel
*chan
,
2310 struct lttng_event
*event
)
2314 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2316 if (chan
->channel_type
== METADATA_CHANNEL
)
2319 ret
= lttng_metadata_printf(session
,
2323 " stream_id = %u;\n",
2331 ret
= lttng_metadata_printf(session
,
2332 " context := struct {\n");
2336 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2340 ret
= lttng_metadata_printf(session
,
2346 ret
= lttng_metadata_printf(session
,
2347 " fields := struct {\n"
2352 ret
= _lttng_fields_metadata_statedump(session
, event
);
2357 * LTTng space reservation can only reserve multiples of the
2360 ret
= lttng_metadata_printf(session
,
2366 event
->metadata_dumped
= 1;
2373 * Must be called with sessions_mutex held.
2376 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2377 struct lttng_channel
*chan
)
2381 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2384 if (chan
->channel_type
== METADATA_CHANNEL
)
2387 WARN_ON_ONCE(!chan
->header_type
);
2388 ret
= lttng_metadata_printf(session
,
2391 " event.header := %s;\n"
2392 " packet.context := struct packet_context;\n",
2394 chan
->header_type
== 1 ? "struct event_header_compact" :
2395 "struct event_header_large");
2400 ret
= lttng_metadata_printf(session
,
2401 " event.context := struct {\n");
2405 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2409 ret
= lttng_metadata_printf(session
,
2415 ret
= lttng_metadata_printf(session
,
2418 chan
->metadata_dumped
= 1;
2424 * Must be called with sessions_mutex held.
2427 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2429 return lttng_metadata_printf(session
,
2430 "struct packet_context {\n"
2431 " uint64_clock_monotonic_t timestamp_begin;\n"
2432 " uint64_clock_monotonic_t timestamp_end;\n"
2433 " uint64_t content_size;\n"
2434 " uint64_t packet_size;\n"
2435 " uint64_t packet_seq_num;\n"
2436 " unsigned long events_discarded;\n"
2437 " uint32_t cpu_id;\n"
2444 * id: range: 0 - 30.
2445 * id 31 is reserved to indicate an extended header.
2448 * id: range: 0 - 65534.
2449 * id 65535 is reserved to indicate an extended header.
2451 * Must be called with sessions_mutex held.
2454 int _lttng_event_header_declare(struct lttng_session
*session
)
2456 return lttng_metadata_printf(session
,
2457 "struct event_header_compact {\n"
2458 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2461 " uint27_clock_monotonic_t timestamp;\n"
2465 " uint64_clock_monotonic_t timestamp;\n"
2470 "struct event_header_large {\n"
2471 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2474 " uint32_clock_monotonic_t timestamp;\n"
2478 " uint64_clock_monotonic_t timestamp;\n"
2482 lttng_alignof(uint32_t) * CHAR_BIT
,
2483 lttng_alignof(uint16_t) * CHAR_BIT
2488 * Approximation of NTP time of day to clock monotonic correlation,
2489 * taken at start of trace.
2490 * Yes, this is only an approximation. Yes, we can (and will) do better
2491 * in future versions.
2492 * This function may return a negative offset. It may happen if the
2493 * system sets the REALTIME clock to 0 after boot.
2495 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2499 int64_t measure_clock_offset(void)
2501 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2502 uint64_t tcf
= trace_clock_freq();
2504 unsigned long flags
;
2505 struct timespec64 rts
= { 0, 0 };
2507 /* Disable interrupts to increase correlation precision. */
2508 local_irq_save(flags
);
2509 monotonic
[0] = trace_clock_read64();
2510 ktime_get_real_ts64(&rts
);
2511 monotonic
[1] = trace_clock_read64();
2512 local_irq_restore(flags
);
2514 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2515 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2516 if (tcf
== NSEC_PER_SEC
) {
2517 realtime
+= rts
.tv_nsec
;
2519 uint64_t n
= rts
.tv_nsec
* tcf
;
2521 do_div(n
, NSEC_PER_SEC
);
2524 offset
= (int64_t) realtime
- monotonic_avg
;
2529 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
2537 while (cur
!= '\0') {
2540 ret
= lttng_metadata_printf(session
, "%s", "\\n");
2544 ret
= lttng_metadata_printf(session
, "%c", '\\');
2547 /* We still print the current char */
2550 ret
= lttng_metadata_printf(session
, "%c", cur
);
2564 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
2565 const char *field_value
)
2569 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
2573 ret
= print_escaped_ctf_string(session
, field_value
);
2577 ret
= lttng_metadata_printf(session
, "\";\n");
2584 * Output metadata into this session's metadata buffers.
2585 * Must be called with sessions_mutex held.
2588 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2590 unsigned char *uuid_c
= session
->uuid
.b
;
2591 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2592 const char *product_uuid
;
2593 struct lttng_channel
*chan
;
2594 struct lttng_event
*event
;
2597 if (!READ_ONCE(session
->active
))
2599 if (session
->metadata_dumped
)
2602 snprintf(uuid_s
, sizeof(uuid_s
),
2603 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2604 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2605 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2606 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2607 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2609 ret
= lttng_metadata_printf(session
,
2610 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2611 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2612 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2613 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2614 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2615 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2616 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2622 " byte_order = %s;\n"
2623 " packet.header := struct {\n"
2624 " uint32_t magic;\n"
2625 " uint8_t uuid[16];\n"
2626 " uint32_t stream_id;\n"
2627 " uint64_t stream_instance_id;\n"
2630 lttng_alignof(uint8_t) * CHAR_BIT
,
2631 lttng_alignof(uint16_t) * CHAR_BIT
,
2632 lttng_alignof(uint32_t) * CHAR_BIT
,
2633 lttng_alignof(uint64_t) * CHAR_BIT
,
2634 sizeof(unsigned long) * CHAR_BIT
,
2635 lttng_alignof(unsigned long) * CHAR_BIT
,
2639 #if __BYTE_ORDER == __BIG_ENDIAN
2648 ret
= lttng_metadata_printf(session
,
2650 " hostname = \"%s\";\n"
2651 " domain = \"kernel\";\n"
2652 " sysname = \"%s\";\n"
2653 " kernel_release = \"%s\";\n"
2654 " kernel_version = \"%s\";\n"
2655 " tracer_name = \"lttng-modules\";\n"
2656 " tracer_major = %d;\n"
2657 " tracer_minor = %d;\n"
2658 " tracer_patchlevel = %d;\n"
2659 " trace_buffering_scheme = \"global\";\n",
2660 current
->nsproxy
->uts_ns
->name
.nodename
,
2664 LTTNG_MODULES_MAJOR_VERSION
,
2665 LTTNG_MODULES_MINOR_VERSION
,
2666 LTTNG_MODULES_PATCHLEVEL_VERSION
2671 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
2674 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
2675 session
->creation_time
);
2679 /* Add the product UUID to the 'env' section */
2680 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
2682 ret
= lttng_metadata_printf(session
,
2683 " product_uuid = \"%s\";\n",
2690 /* Close the 'env' section */
2691 ret
= lttng_metadata_printf(session
, "};\n\n");
2695 ret
= lttng_metadata_printf(session
,
2697 " name = \"%s\";\n",
2703 if (!trace_clock_uuid(clock_uuid_s
)) {
2704 ret
= lttng_metadata_printf(session
,
2705 " uuid = \"%s\";\n",
2712 ret
= lttng_metadata_printf(session
,
2713 " description = \"%s\";\n"
2714 " freq = %llu; /* Frequency, in Hz */\n"
2715 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2718 trace_clock_description(),
2719 (unsigned long long) trace_clock_freq(),
2720 (long long) measure_clock_offset()
2725 ret
= lttng_metadata_printf(session
,
2726 "typealias integer {\n"
2727 " size = 27; align = 1; signed = false;\n"
2728 " map = clock.%s.value;\n"
2729 "} := uint27_clock_monotonic_t;\n"
2731 "typealias integer {\n"
2732 " size = 32; align = %u; signed = false;\n"
2733 " map = clock.%s.value;\n"
2734 "} := uint32_clock_monotonic_t;\n"
2736 "typealias integer {\n"
2737 " size = 64; align = %u; signed = false;\n"
2738 " map = clock.%s.value;\n"
2739 "} := uint64_clock_monotonic_t;\n\n",
2741 lttng_alignof(uint32_t) * CHAR_BIT
,
2743 lttng_alignof(uint64_t) * CHAR_BIT
,
2749 ret
= _lttng_stream_packet_context_declare(session
);
2753 ret
= _lttng_event_header_declare(session
);
2758 list_for_each_entry(chan
, &session
->chan
, list
) {
2759 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2764 list_for_each_entry(event
, &session
->events
, list
) {
2765 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2769 session
->metadata_dumped
= 1;
2775 * lttng_transport_register - LTT transport registration
2776 * @transport: transport structure
2778 * Registers a transport which can be used as output to extract the data out of
2781 void lttng_transport_register(struct lttng_transport
*transport
)
2783 mutex_lock(&sessions_mutex
);
2784 list_add_tail(&transport
->node
, <tng_transport_list
);
2785 mutex_unlock(&sessions_mutex
);
2787 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2790 * lttng_transport_unregister - LTT transport unregistration
2791 * @transport: transport structure
2793 void lttng_transport_unregister(struct lttng_transport
*transport
)
2795 mutex_lock(&sessions_mutex
);
2796 list_del(&transport
->node
);
2797 mutex_unlock(&sessions_mutex
);
2799 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2801 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2803 enum cpuhp_state lttng_hp_prepare
;
2804 enum cpuhp_state lttng_hp_online
;
2806 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2808 struct lttng_cpuhp_node
*lttng_node
;
2810 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2811 switch (lttng_node
->component
) {
2812 case LTTNG_RING_BUFFER_FRONTEND
:
2814 case LTTNG_RING_BUFFER_BACKEND
:
2815 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2816 case LTTNG_RING_BUFFER_ITER
:
2818 case LTTNG_CONTEXT_PERF_COUNTERS
:
2825 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2827 struct lttng_cpuhp_node
*lttng_node
;
2829 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2830 switch (lttng_node
->component
) {
2831 case LTTNG_RING_BUFFER_FRONTEND
:
2832 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2833 case LTTNG_RING_BUFFER_BACKEND
:
2835 case LTTNG_RING_BUFFER_ITER
:
2837 case LTTNG_CONTEXT_PERF_COUNTERS
:
2838 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2844 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2846 struct lttng_cpuhp_node
*lttng_node
;
2848 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2849 switch (lttng_node
->component
) {
2850 case LTTNG_RING_BUFFER_FRONTEND
:
2851 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2852 case LTTNG_RING_BUFFER_BACKEND
:
2854 case LTTNG_RING_BUFFER_ITER
:
2855 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2856 case LTTNG_CONTEXT_PERF_COUNTERS
:
2857 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2863 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2865 struct lttng_cpuhp_node
*lttng_node
;
2867 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2868 switch (lttng_node
->component
) {
2869 case LTTNG_RING_BUFFER_FRONTEND
:
2870 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2871 case LTTNG_RING_BUFFER_BACKEND
:
2873 case LTTNG_RING_BUFFER_ITER
:
2875 case LTTNG_CONTEXT_PERF_COUNTERS
:
2882 static int __init
lttng_init_cpu_hotplug(void)
2886 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2887 lttng_hotplug_prepare
,
2888 lttng_hotplug_dead
);
2892 lttng_hp_prepare
= ret
;
2893 lttng_rb_set_hp_prepare(ret
);
2895 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2896 lttng_hotplug_online
,
2897 lttng_hotplug_offline
);
2899 cpuhp_remove_multi_state(lttng_hp_prepare
);
2900 lttng_hp_prepare
= 0;
2903 lttng_hp_online
= ret
;
2904 lttng_rb_set_hp_online(ret
);
2909 static void __exit
lttng_exit_cpu_hotplug(void)
2911 lttng_rb_set_hp_online(0);
2912 cpuhp_remove_multi_state(lttng_hp_online
);
2913 lttng_rb_set_hp_prepare(0);
2914 cpuhp_remove_multi_state(lttng_hp_prepare
);
2917 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2918 static int lttng_init_cpu_hotplug(void)
2922 static void lttng_exit_cpu_hotplug(void)
2925 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2928 static int __init
lttng_events_init(void)
2932 ret
= lttng_probes_init();
2935 ret
= lttng_context_init();
2938 ret
= lttng_tracepoint_init();
2941 event_cache
= KMEM_CACHE(lttng_event
, 0);
2946 ret
= lttng_abi_init();
2949 ret
= lttng_logger_init();
2952 ret
= lttng_init_cpu_hotplug();
2955 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2956 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2957 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2958 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2959 LTTNG_MODULES_EXTRAVERSION
,
2961 #ifdef LTTNG_EXTRA_VERSION_GIT
2962 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2966 #ifdef LTTNG_EXTRA_VERSION_NAME
2967 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2974 lttng_logger_exit();
2978 kmem_cache_destroy(event_cache
);
2980 lttng_tracepoint_exit();
2982 lttng_context_exit();
2983 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2984 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2985 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2986 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2987 LTTNG_MODULES_EXTRAVERSION
,
2989 #ifdef LTTNG_EXTRA_VERSION_GIT
2990 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2994 #ifdef LTTNG_EXTRA_VERSION_NAME
2995 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3002 module_init(lttng_events_init
);
3004 static void __exit
lttng_events_exit(void)
3006 struct lttng_session
*session
, *tmpsession
;
3008 lttng_exit_cpu_hotplug();
3009 lttng_logger_exit();
3011 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
3012 lttng_session_destroy(session
);
3013 kmem_cache_destroy(event_cache
);
3014 lttng_tracepoint_exit();
3015 lttng_context_exit();
3016 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
3017 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3018 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3019 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3020 LTTNG_MODULES_EXTRAVERSION
,
3022 #ifdef LTTNG_EXTRA_VERSION_GIT
3023 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3027 #ifdef LTTNG_EXTRA_VERSION_NAME
3028 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3034 module_exit(lttng_events_exit
);
3036 #include "extra_version/patches.i"
3037 #ifdef LTTNG_EXTRA_VERSION_GIT
3038 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
3040 #ifdef LTTNG_EXTRA_VERSION_NAME
3041 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
3043 MODULE_LICENSE("GPL and additional rights");
3044 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3045 MODULE_DESCRIPTION("LTTng tracer");
3046 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
3047 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
3048 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
3049 LTTNG_MODULES_EXTRAVERSION
);