4 * Holds LTTng per-session event registry.
6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
25 * overrides a function with a define.
27 #include "wrapper/page_alloc.h"
29 #include <linux/module.h>
30 #include <linux/mutex.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/jiffies.h>
34 #include <linux/utsname.h>
35 #include <linux/err.h>
36 #include <linux/seq_file.h>
37 #include <linux/file.h>
38 #include <linux/anon_inodes.h>
39 #include <wrapper/file.h>
40 #include <linux/jhash.h>
41 #include <linux/uaccess.h>
42 #include <linux/vmalloc.h>
44 #include <wrapper/uuid.h>
45 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
46 #include <wrapper/random.h>
47 #include <wrapper/tracepoint.h>
48 #include <wrapper/list.h>
49 #include <wrapper/types.h>
50 #include <lttng-kernel-version.h>
51 #include <lttng-events.h>
52 #include <lttng-tracer.h>
53 #include <lttng-abi-old.h>
54 #include <lttng-endian.h>
55 #include <lttng-string-utils.h>
56 #include <wrapper/vzalloc.h>
57 #include <wrapper/ringbuffer/backend.h>
58 #include <wrapper/ringbuffer/frontend.h>
59 #include <wrapper/time.h>
61 #define METADATA_CACHE_DEFAULT_SIZE 4096
63 static LIST_HEAD(sessions
);
64 static LIST_HEAD(lttng_transport_list
);
66 * Protect the sessions and metadata caches.
68 static DEFINE_MUTEX(sessions_mutex
);
69 static struct kmem_cache
*event_cache
;
71 static void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
72 static void lttng_session_sync_enablers(struct lttng_session
*session
);
73 static void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
75 static void _lttng_event_destroy(struct lttng_event
*event
);
76 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
77 static int _lttng_event_unregister(struct lttng_event
*event
);
79 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
80 struct lttng_channel
*chan
,
81 struct lttng_event
*event
);
83 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
85 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
87 int _lttng_field_statedump(struct lttng_session
*session
,
88 const struct lttng_event_field
*field
,
91 void synchronize_trace(void)
93 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
99 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
100 #ifdef CONFIG_PREEMPT_RT_FULL
103 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
104 #ifdef CONFIG_PREEMPT_RT
107 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
110 void lttng_lock_sessions(void)
112 mutex_lock(&sessions_mutex
);
115 void lttng_unlock_sessions(void)
117 mutex_unlock(&sessions_mutex
);
121 * Called with sessions lock held.
123 int lttng_session_active(void)
125 struct lttng_session
*iter
;
127 list_for_each_entry(iter
, &sessions
, list
) {
134 struct lttng_session
*lttng_session_create(void)
136 struct lttng_session
*session
;
137 struct lttng_metadata_cache
*metadata_cache
;
140 mutex_lock(&sessions_mutex
);
141 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
144 INIT_LIST_HEAD(&session
->chan
);
145 INIT_LIST_HEAD(&session
->events
);
146 uuid_le_gen(&session
->uuid
);
148 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
151 goto err_free_session
;
152 metadata_cache
->data
= lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
153 if (!metadata_cache
->data
)
155 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
156 kref_init(&metadata_cache
->refcount
);
157 mutex_init(&metadata_cache
->lock
);
158 session
->metadata_cache
= metadata_cache
;
159 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
160 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
161 sizeof(metadata_cache
->uuid
));
162 INIT_LIST_HEAD(&session
->enablers_head
);
163 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
164 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
165 list_add(&session
->list
, &sessions
);
166 mutex_unlock(&sessions_mutex
);
170 kfree(metadata_cache
);
172 lttng_kvfree(session
);
174 mutex_unlock(&sessions_mutex
);
178 void metadata_cache_destroy(struct kref
*kref
)
180 struct lttng_metadata_cache
*cache
=
181 container_of(kref
, struct lttng_metadata_cache
, refcount
);
186 void lttng_session_destroy(struct lttng_session
*session
)
188 struct lttng_channel
*chan
, *tmpchan
;
189 struct lttng_event
*event
, *tmpevent
;
190 struct lttng_metadata_stream
*metadata_stream
;
191 struct lttng_enabler
*enabler
, *tmpenabler
;
194 mutex_lock(&sessions_mutex
);
195 WRITE_ONCE(session
->active
, 0);
196 list_for_each_entry(chan
, &session
->chan
, list
) {
197 ret
= lttng_syscalls_unregister(chan
);
200 list_for_each_entry(event
, &session
->events
, list
) {
201 ret
= _lttng_event_unregister(event
);
204 synchronize_trace(); /* Wait for in-flight events to complete */
205 list_for_each_entry_safe(enabler
, tmpenabler
,
206 &session
->enablers_head
, node
)
207 lttng_enabler_destroy(enabler
);
208 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
209 _lttng_event_destroy(event
);
210 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
211 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
212 _lttng_channel_destroy(chan
);
214 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
215 _lttng_metadata_channel_hangup(metadata_stream
);
216 if (session
->pid_tracker
)
217 lttng_pid_tracker_destroy(session
->pid_tracker
);
218 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
219 list_del(&session
->list
);
220 mutex_unlock(&sessions_mutex
);
221 lttng_kvfree(session
);
224 int lttng_session_statedump(struct lttng_session
*session
)
228 mutex_lock(&sessions_mutex
);
229 ret
= lttng_statedump_start(session
);
230 mutex_unlock(&sessions_mutex
);
234 int lttng_session_enable(struct lttng_session
*session
)
237 struct lttng_channel
*chan
;
239 mutex_lock(&sessions_mutex
);
240 if (session
->active
) {
245 /* Set transient enabler state to "enabled" */
249 * Snapshot the number of events per channel to know the type of header
252 list_for_each_entry(chan
, &session
->chan
, list
) {
253 if (chan
->header_type
)
254 continue; /* don't change it if session stop/restart */
255 if (chan
->free_event_id
< 31)
256 chan
->header_type
= 1; /* compact */
258 chan
->header_type
= 2; /* large */
261 /* We need to sync enablers with session before activation. */
262 lttng_session_sync_enablers(session
);
264 /* Clear each stream's quiescent state. */
265 list_for_each_entry(chan
, &session
->chan
, list
) {
266 if (chan
->channel_type
!= METADATA_CHANNEL
)
267 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
270 WRITE_ONCE(session
->active
, 1);
271 WRITE_ONCE(session
->been_active
, 1);
272 ret
= _lttng_session_metadata_statedump(session
);
274 WRITE_ONCE(session
->active
, 0);
277 ret
= lttng_statedump_start(session
);
279 WRITE_ONCE(session
->active
, 0);
281 mutex_unlock(&sessions_mutex
);
285 int lttng_session_disable(struct lttng_session
*session
)
288 struct lttng_channel
*chan
;
290 mutex_lock(&sessions_mutex
);
291 if (!session
->active
) {
295 WRITE_ONCE(session
->active
, 0);
297 /* Set transient enabler state to "disabled" */
299 lttng_session_sync_enablers(session
);
301 /* Set each stream's quiescent state. */
302 list_for_each_entry(chan
, &session
->chan
, list
) {
303 if (chan
->channel_type
!= METADATA_CHANNEL
)
304 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
307 mutex_unlock(&sessions_mutex
);
311 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
314 struct lttng_channel
*chan
;
315 struct lttng_event
*event
;
316 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
317 struct lttng_metadata_stream
*stream
;
319 mutex_lock(&sessions_mutex
);
320 if (!session
->active
) {
325 mutex_lock(&cache
->lock
);
326 memset(cache
->data
, 0, cache
->cache_alloc
);
327 cache
->metadata_written
= 0;
329 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
330 stream
->metadata_out
= 0;
331 stream
->metadata_in
= 0;
333 mutex_unlock(&cache
->lock
);
335 session
->metadata_dumped
= 0;
336 list_for_each_entry(chan
, &session
->chan
, list
) {
337 chan
->metadata_dumped
= 0;
340 list_for_each_entry(event
, &session
->events
, list
) {
341 event
->metadata_dumped
= 0;
344 ret
= _lttng_session_metadata_statedump(session
);
347 mutex_unlock(&sessions_mutex
);
353 int lttng_channel_enable(struct lttng_channel
*channel
)
357 mutex_lock(&sessions_mutex
);
358 if (channel
->channel_type
== METADATA_CHANNEL
) {
362 if (channel
->enabled
) {
366 /* Set transient enabler state to "enabled" */
368 lttng_session_sync_enablers(channel
->session
);
369 /* Set atomically the state to "enabled" */
370 WRITE_ONCE(channel
->enabled
, 1);
372 mutex_unlock(&sessions_mutex
);
376 int lttng_channel_disable(struct lttng_channel
*channel
)
380 mutex_lock(&sessions_mutex
);
381 if (channel
->channel_type
== METADATA_CHANNEL
) {
385 if (!channel
->enabled
) {
389 /* Set atomically the state to "disabled" */
390 WRITE_ONCE(channel
->enabled
, 0);
391 /* Set transient enabler state to "enabled" */
393 lttng_session_sync_enablers(channel
->session
);
395 mutex_unlock(&sessions_mutex
);
399 int lttng_event_enable(struct lttng_event
*event
)
403 mutex_lock(&sessions_mutex
);
404 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
408 if (event
->enabled
) {
412 switch (event
->instrumentation
) {
413 case LTTNG_KERNEL_TRACEPOINT
:
414 case LTTNG_KERNEL_SYSCALL
:
417 case LTTNG_KERNEL_KPROBE
:
418 case LTTNG_KERNEL_FUNCTION
:
419 case LTTNG_KERNEL_NOOP
:
420 WRITE_ONCE(event
->enabled
, 1);
422 case LTTNG_KERNEL_KRETPROBE
:
423 ret
= lttng_kretprobes_event_enable_state(event
, 1);
430 mutex_unlock(&sessions_mutex
);
434 int lttng_event_disable(struct lttng_event
*event
)
438 mutex_lock(&sessions_mutex
);
439 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
443 if (!event
->enabled
) {
447 switch (event
->instrumentation
) {
448 case LTTNG_KERNEL_TRACEPOINT
:
449 case LTTNG_KERNEL_SYSCALL
:
452 case LTTNG_KERNEL_KPROBE
:
453 case LTTNG_KERNEL_FUNCTION
:
454 case LTTNG_KERNEL_NOOP
:
455 WRITE_ONCE(event
->enabled
, 0);
457 case LTTNG_KERNEL_KRETPROBE
:
458 ret
= lttng_kretprobes_event_enable_state(event
, 0);
465 mutex_unlock(&sessions_mutex
);
469 static struct lttng_transport
*lttng_transport_find(const char *name
)
471 struct lttng_transport
*transport
;
473 list_for_each_entry(transport
, <tng_transport_list
, node
) {
474 if (!strcmp(transport
->name
, name
))
480 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
481 const char *transport_name
,
483 size_t subbuf_size
, size_t num_subbuf
,
484 unsigned int switch_timer_interval
,
485 unsigned int read_timer_interval
,
486 enum channel_type channel_type
)
488 struct lttng_channel
*chan
;
489 struct lttng_transport
*transport
= NULL
;
491 mutex_lock(&sessions_mutex
);
492 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
493 goto active
; /* Refuse to add channel to active session */
494 transport
= lttng_transport_find(transport_name
);
496 printk(KERN_WARNING
"LTTng transport %s not found\n",
500 if (!try_module_get(transport
->owner
)) {
501 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
504 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
507 chan
->session
= session
;
508 chan
->id
= session
->free_chan_id
++;
509 chan
->ops
= &transport
->ops
;
511 * Note: the channel creation op already writes into the packet
512 * headers. Therefore the "chan" information used as input
513 * should be already accessible.
515 chan
->chan
= transport
->ops
.channel_create(transport_name
,
516 chan
, buf_addr
, subbuf_size
, num_subbuf
,
517 switch_timer_interval
, read_timer_interval
);
522 chan
->transport
= transport
;
523 chan
->channel_type
= channel_type
;
524 list_add(&chan
->list
, &session
->chan
);
525 mutex_unlock(&sessions_mutex
);
532 module_put(transport
->owner
);
535 mutex_unlock(&sessions_mutex
);
540 * Only used internally at session destruction for per-cpu channels, and
541 * when metadata channel is released.
542 * Needs to be called with sessions mutex held.
545 void _lttng_channel_destroy(struct lttng_channel
*chan
)
547 chan
->ops
->channel_destroy(chan
->chan
);
548 module_put(chan
->transport
->owner
);
549 list_del(&chan
->list
);
550 lttng_destroy_context(chan
->ctx
);
554 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
556 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
558 /* Protect the metadata cache with the sessions_mutex. */
559 mutex_lock(&sessions_mutex
);
560 _lttng_channel_destroy(chan
);
561 mutex_unlock(&sessions_mutex
);
563 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
566 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
568 stream
->finalized
= 1;
569 wake_up_interruptible(&stream
->read_wait
);
573 * Supports event creation while tracing session is active.
574 * Needs to be called with sessions mutex held.
576 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
577 struct lttng_kernel_event
*event_param
,
579 const struct lttng_event_desc
*event_desc
,
580 enum lttng_kernel_instrumentation itype
)
582 struct lttng_session
*session
= chan
->session
;
583 struct lttng_event
*event
;
584 const char *event_name
;
585 struct hlist_head
*head
;
590 if (chan
->free_event_id
== -1U) {
596 case LTTNG_KERNEL_TRACEPOINT
:
597 event_name
= event_desc
->name
;
599 case LTTNG_KERNEL_KPROBE
:
600 case LTTNG_KERNEL_KRETPROBE
:
601 case LTTNG_KERNEL_FUNCTION
:
602 case LTTNG_KERNEL_NOOP
:
603 case LTTNG_KERNEL_SYSCALL
:
604 event_name
= event_param
->name
;
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_FUNCTION
:
730 * Needs to be explicitly enabled after creation, since
731 * we may want to apply filters.
734 event
->registered
= 1;
736 * Populate lttng_event structure before event
740 ret
= lttng_ftrace_register(event_name
,
741 event_param
->u
.ftrace
.symbol_name
,
746 ret
= try_module_get(event
->desc
->owner
);
749 case LTTNG_KERNEL_NOOP
:
750 case LTTNG_KERNEL_SYSCALL
:
752 * Needs to be explicitly enabled after creation, since
753 * we may want to apply filters.
756 event
->registered
= 0;
757 event
->desc
= event_desc
;
768 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
769 WARN_ON_ONCE(ret
> 0);
771 goto statedump_error
;
773 hlist_add_head(&event
->hlist
, head
);
774 list_add(&event
->list
, &chan
->session
->events
);
778 /* If a statedump error occurs, events will not be readable. */
780 kmem_cache_free(event_cache
, event
);
788 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
789 struct lttng_kernel_event
*event_param
,
791 const struct lttng_event_desc
*event_desc
,
792 enum lttng_kernel_instrumentation itype
)
794 struct lttng_event
*event
;
796 mutex_lock(&sessions_mutex
);
797 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
799 mutex_unlock(&sessions_mutex
);
803 /* Only used for tracepoints for now. */
805 void register_event(struct lttng_event
*event
)
807 const struct lttng_event_desc
*desc
;
810 if (event
->registered
)
814 switch (event
->instrumentation
) {
815 case LTTNG_KERNEL_TRACEPOINT
:
816 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
817 desc
->probe_callback
,
820 case LTTNG_KERNEL_SYSCALL
:
821 ret
= lttng_syscall_filter_enable(event
->chan
,
824 case LTTNG_KERNEL_KPROBE
:
825 case LTTNG_KERNEL_KRETPROBE
:
826 case LTTNG_KERNEL_FUNCTION
:
827 case LTTNG_KERNEL_NOOP
:
834 event
->registered
= 1;
838 * Only used internally at session destruction.
840 int _lttng_event_unregister(struct lttng_event
*event
)
842 const struct lttng_event_desc
*desc
;
845 if (!event
->registered
)
849 switch (event
->instrumentation
) {
850 case LTTNG_KERNEL_TRACEPOINT
:
851 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
852 event
->desc
->probe_callback
,
855 case LTTNG_KERNEL_KPROBE
:
856 lttng_kprobes_unregister(event
);
859 case LTTNG_KERNEL_KRETPROBE
:
860 lttng_kretprobes_unregister(event
);
863 case LTTNG_KERNEL_FUNCTION
:
864 lttng_ftrace_unregister(event
);
867 case LTTNG_KERNEL_SYSCALL
:
868 ret
= lttng_syscall_filter_disable(event
->chan
,
871 case LTTNG_KERNEL_NOOP
:
878 event
->registered
= 0;
883 * Only used internally at session destruction.
886 void _lttng_event_destroy(struct lttng_event
*event
)
888 switch (event
->instrumentation
) {
889 case LTTNG_KERNEL_TRACEPOINT
:
890 lttng_event_put(event
->desc
);
892 case LTTNG_KERNEL_KPROBE
:
893 module_put(event
->desc
->owner
);
894 lttng_kprobes_destroy_private(event
);
896 case LTTNG_KERNEL_KRETPROBE
:
897 module_put(event
->desc
->owner
);
898 lttng_kretprobes_destroy_private(event
);
900 case LTTNG_KERNEL_FUNCTION
:
901 module_put(event
->desc
->owner
);
902 lttng_ftrace_destroy_private(event
);
904 case LTTNG_KERNEL_NOOP
:
905 case LTTNG_KERNEL_SYSCALL
:
910 list_del(&event
->list
);
911 lttng_destroy_context(event
->ctx
);
912 kmem_cache_free(event_cache
, event
);
915 int lttng_session_track_pid(struct lttng_session
*session
, int pid
)
921 mutex_lock(&sessions_mutex
);
923 /* track all pids: destroy tracker. */
924 if (session
->pid_tracker
) {
925 struct lttng_pid_tracker
*lpf
;
927 lpf
= session
->pid_tracker
;
928 rcu_assign_pointer(session
->pid_tracker
, NULL
);
930 lttng_pid_tracker_destroy(lpf
);
934 if (!session
->pid_tracker
) {
935 struct lttng_pid_tracker
*lpf
;
937 lpf
= lttng_pid_tracker_create();
942 ret
= lttng_pid_tracker_add(lpf
, pid
);
943 rcu_assign_pointer(session
->pid_tracker
, lpf
);
945 ret
= lttng_pid_tracker_add(session
->pid_tracker
, pid
);
949 mutex_unlock(&sessions_mutex
);
953 int lttng_session_untrack_pid(struct lttng_session
*session
, int pid
)
959 mutex_lock(&sessions_mutex
);
961 /* untrack all pids: replace by empty tracker. */
962 struct lttng_pid_tracker
*old_lpf
= session
->pid_tracker
;
963 struct lttng_pid_tracker
*lpf
;
965 lpf
= lttng_pid_tracker_create();
970 rcu_assign_pointer(session
->pid_tracker
, lpf
);
973 lttng_pid_tracker_destroy(old_lpf
);
976 if (!session
->pid_tracker
) {
980 ret
= lttng_pid_tracker_del(session
->pid_tracker
, pid
);
983 mutex_unlock(&sessions_mutex
);
988 void *pid_list_start(struct seq_file
*m
, loff_t
*pos
)
990 struct lttng_session
*session
= m
->private;
991 struct lttng_pid_tracker
*lpf
;
992 struct lttng_pid_hash_node
*e
;
995 mutex_lock(&sessions_mutex
);
996 lpf
= session
->pid_tracker
;
998 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
999 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1001 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1007 /* PID tracker disabled. */
1008 if (iter
>= *pos
&& iter
== 0) {
1009 return session
; /* empty tracker */
1017 /* Called with sessions_mutex held. */
1019 void *pid_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1021 struct lttng_session
*session
= m
->private;
1022 struct lttng_pid_tracker
*lpf
;
1023 struct lttng_pid_hash_node
*e
;
1027 lpf
= session
->pid_tracker
;
1029 for (i
= 0; i
< LTTNG_PID_TABLE_SIZE
; i
++) {
1030 struct hlist_head
*head
= &lpf
->pid_hash
[i
];
1032 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1033 if (iter
++ >= *ppos
)
1038 /* PID tracker disabled. */
1039 if (iter
>= *ppos
&& iter
== 0)
1040 return session
; /* empty tracker */
1049 void pid_list_stop(struct seq_file
*m
, void *p
)
1051 mutex_unlock(&sessions_mutex
);
1055 int pid_list_show(struct seq_file
*m
, void *p
)
1059 if (p
== m
->private) {
1060 /* Tracker disabled. */
1063 const struct lttng_pid_hash_node
*e
= p
;
1065 pid
= lttng_pid_tracker_get_node_pid(e
);
1067 seq_printf(m
, "process { pid = %d; };\n", pid
);
1072 const struct seq_operations lttng_tracker_pids_list_seq_ops
= {
1073 .start
= pid_list_start
,
1074 .next
= pid_list_next
,
1075 .stop
= pid_list_stop
,
1076 .show
= pid_list_show
,
1080 int lttng_tracker_pids_list_open(struct inode
*inode
, struct file
*file
)
1082 return seq_open(file
, <tng_tracker_pids_list_seq_ops
);
1086 int lttng_tracker_pids_list_release(struct inode
*inode
, struct file
*file
)
1088 struct seq_file
*m
= file
->private_data
;
1089 struct lttng_session
*session
= m
->private;
1092 WARN_ON_ONCE(!session
);
1093 ret
= seq_release(inode
, file
);
1094 if (!ret
&& session
)
1095 fput(session
->file
);
1099 const struct file_operations lttng_tracker_pids_list_fops
= {
1100 .owner
= THIS_MODULE
,
1101 .open
= lttng_tracker_pids_list_open
,
1103 .llseek
= seq_lseek
,
1104 .release
= lttng_tracker_pids_list_release
,
1107 int lttng_session_list_tracker_pids(struct lttng_session
*session
)
1109 struct file
*tracker_pids_list_file
;
1113 file_fd
= lttng_get_unused_fd();
1119 tracker_pids_list_file
= anon_inode_getfile("[lttng_tracker_pids_list]",
1120 <tng_tracker_pids_list_fops
,
1122 if (IS_ERR(tracker_pids_list_file
)) {
1123 ret
= PTR_ERR(tracker_pids_list_file
);
1126 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1128 goto refcount_error
;
1130 ret
= lttng_tracker_pids_list_fops
.open(NULL
, tracker_pids_list_file
);
1133 m
= tracker_pids_list_file
->private_data
;
1134 m
->private = session
;
1135 fd_install(file_fd
, tracker_pids_list_file
);
1140 atomic_long_dec(&session
->file
->f_count
);
1142 fput(tracker_pids_list_file
);
1144 put_unused_fd(file_fd
);
1150 * Enabler management.
1153 int lttng_match_enabler_star_glob(const char *desc_name
,
1154 const char *pattern
)
1156 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1157 desc_name
, LTTNG_SIZE_MAX
))
1163 int lttng_match_enabler_name(const char *desc_name
,
1166 if (strcmp(desc_name
, name
))
1172 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1173 struct lttng_enabler
*enabler
)
1175 const char *desc_name
, *enabler_name
;
1177 enabler_name
= enabler
->event_param
.name
;
1178 switch (enabler
->event_param
.instrumentation
) {
1179 case LTTNG_KERNEL_TRACEPOINT
:
1180 desc_name
= desc
->name
;
1182 case LTTNG_KERNEL_SYSCALL
:
1183 desc_name
= desc
->name
;
1184 if (!strncmp(desc_name
, "compat_", strlen("compat_")))
1185 desc_name
+= strlen("compat_");
1186 if (!strncmp(desc_name
, "syscall_exit_",
1187 strlen("syscall_exit_"))) {
1188 desc_name
+= strlen("syscall_exit_");
1189 } else if (!strncmp(desc_name
, "syscall_entry_",
1190 strlen("syscall_entry_"))) {
1191 desc_name
+= strlen("syscall_entry_");
1201 switch (enabler
->type
) {
1202 case LTTNG_ENABLER_STAR_GLOB
:
1203 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1204 case LTTNG_ENABLER_NAME
:
1205 return lttng_match_enabler_name(desc_name
, enabler_name
);
1212 int lttng_event_match_enabler(struct lttng_event
*event
,
1213 struct lttng_enabler
*enabler
)
1215 if (enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1217 if (lttng_desc_match_enabler(event
->desc
, enabler
)
1218 && event
->chan
== enabler
->chan
)
1225 struct lttng_enabler_ref
*lttng_event_enabler_ref(struct lttng_event
*event
,
1226 struct lttng_enabler
*enabler
)
1228 struct lttng_enabler_ref
*enabler_ref
;
1230 list_for_each_entry(enabler_ref
,
1231 &event
->enablers_ref_head
, node
) {
1232 if (enabler_ref
->ref
== enabler
)
1239 void lttng_create_tracepoint_if_missing(struct lttng_enabler
*enabler
)
1241 struct lttng_session
*session
= enabler
->chan
->session
;
1242 struct lttng_probe_desc
*probe_desc
;
1243 const struct lttng_event_desc
*desc
;
1245 struct list_head
*probe_list
;
1247 probe_list
= lttng_get_probe_list_head();
1249 * For each probe event, if we find that a probe event matches
1250 * our enabler, create an associated lttng_event if not
1253 list_for_each_entry(probe_desc
, probe_list
, head
) {
1254 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1256 struct hlist_head
*head
;
1257 const char *event_name
;
1260 struct lttng_event
*event
;
1262 desc
= probe_desc
->event_desc
[i
];
1263 if (!lttng_desc_match_enabler(desc
, enabler
))
1265 event_name
= desc
->name
;
1266 name_len
= strlen(event_name
);
1269 * Check if already created.
1271 hash
= jhash(event_name
, name_len
, 0);
1272 head
= &session
->events_ht
.table
[hash
& (LTTNG_EVENT_HT_SIZE
- 1)];
1273 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1274 if (event
->desc
== desc
1275 && event
->chan
== enabler
->chan
)
1282 * We need to create an event for this
1285 event
= _lttng_event_create(enabler
->chan
,
1287 LTTNG_KERNEL_TRACEPOINT
);
1289 printk(KERN_INFO
"Unable to create event %s\n",
1290 probe_desc
->event_desc
[i
]->name
);
1297 void lttng_create_syscall_if_missing(struct lttng_enabler
*enabler
)
1301 ret
= lttng_syscalls_register(enabler
->chan
, NULL
);
1306 * Create struct lttng_event if it is missing and present in the list of
1307 * tracepoint probes.
1308 * Should be called with sessions mutex held.
1311 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
1313 switch (enabler
->event_param
.instrumentation
) {
1314 case LTTNG_KERNEL_TRACEPOINT
:
1315 lttng_create_tracepoint_if_missing(enabler
);
1317 case LTTNG_KERNEL_SYSCALL
:
1318 lttng_create_syscall_if_missing(enabler
);
1327 * Create events associated with an enabler (if not already present),
1328 * and add backward reference from the event to the enabler.
1329 * Should be called with sessions mutex held.
1332 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
1334 struct lttng_session
*session
= enabler
->chan
->session
;
1335 struct lttng_event
*event
;
1337 /* First ensure that probe events are created for this enabler. */
1338 lttng_create_event_if_missing(enabler
);
1340 /* For each event matching enabler in session event list. */
1341 list_for_each_entry(event
, &session
->events
, list
) {
1342 struct lttng_enabler_ref
*enabler_ref
;
1344 if (!lttng_event_match_enabler(event
, enabler
))
1346 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
1349 * If no backward ref, create it.
1350 * Add backward ref from event to enabler.
1352 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1355 enabler_ref
->ref
= enabler
;
1356 list_add(&enabler_ref
->node
,
1357 &event
->enablers_ref_head
);
1361 * Link filter bytecodes if not linked yet.
1363 lttng_enabler_event_link_bytecode(event
, enabler
);
1365 /* TODO: merge event context. */
1371 * Called at module load: connect the probe on all enablers matching
1373 * Called with sessions lock held.
1375 int lttng_fix_pending_events(void)
1377 struct lttng_session
*session
;
1379 list_for_each_entry(session
, &sessions
, list
)
1380 lttng_session_lazy_sync_enablers(session
);
1384 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1385 struct lttng_kernel_event
*event_param
,
1386 struct lttng_channel
*chan
)
1388 struct lttng_enabler
*enabler
;
1390 enabler
= kzalloc(sizeof(*enabler
), GFP_KERNEL
);
1393 enabler
->type
= type
;
1394 INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1395 memcpy(&enabler
->event_param
, event_param
,
1396 sizeof(enabler
->event_param
));
1397 enabler
->chan
= chan
;
1399 enabler
->enabled
= 0;
1400 enabler
->evtype
= LTTNG_TYPE_ENABLER
;
1401 mutex_lock(&sessions_mutex
);
1402 list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1403 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1404 mutex_unlock(&sessions_mutex
);
1408 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1410 mutex_lock(&sessions_mutex
);
1411 enabler
->enabled
= 1;
1412 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1413 mutex_unlock(&sessions_mutex
);
1417 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1419 mutex_lock(&sessions_mutex
);
1420 enabler
->enabled
= 0;
1421 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1422 mutex_unlock(&sessions_mutex
);
1426 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1427 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1429 struct lttng_filter_bytecode_node
*bytecode_node
;
1430 uint32_t bytecode_len
;
1433 ret
= get_user(bytecode_len
, &bytecode
->len
);
1436 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1440 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1441 sizeof(*bytecode
) + bytecode_len
);
1444 bytecode_node
->enabler
= enabler
;
1445 /* Enforce length based on allocated size */
1446 bytecode_node
->bc
.len
= bytecode_len
;
1447 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1448 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1452 kfree(bytecode_node
);
1456 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1457 struct lttng_kernel_context
*context_param
)
1463 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1465 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1467 /* Destroy filter bytecode */
1468 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1469 &enabler
->filter_bytecode_head
, node
) {
1473 /* Destroy contexts */
1474 lttng_destroy_context(enabler
->ctx
);
1476 list_del(&enabler
->node
);
1481 * lttng_session_sync_enablers should be called just before starting a
1483 * Should be called with sessions mutex held.
1486 void lttng_session_sync_enablers(struct lttng_session
*session
)
1488 struct lttng_enabler
*enabler
;
1489 struct lttng_event
*event
;
1491 list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1492 lttng_enabler_ref_events(enabler
);
1494 * For each event, if at least one of its enablers is enabled,
1495 * and its channel and session transient states are enabled, we
1496 * enable the event, else we disable it.
1498 list_for_each_entry(event
, &session
->events
, list
) {
1499 struct lttng_enabler_ref
*enabler_ref
;
1500 struct lttng_bytecode_runtime
*runtime
;
1501 int enabled
= 0, has_enablers_without_bytecode
= 0;
1503 switch (event
->instrumentation
) {
1504 case LTTNG_KERNEL_TRACEPOINT
:
1505 case LTTNG_KERNEL_SYSCALL
:
1507 list_for_each_entry(enabler_ref
,
1508 &event
->enablers_ref_head
, node
) {
1509 if (enabler_ref
->ref
->enabled
) {
1516 /* Not handled with lazy sync. */
1520 * Enabled state is based on union of enablers, with
1521 * intesection of session and channel transient enable
1524 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1526 WRITE_ONCE(event
->enabled
, enabled
);
1528 * Sync tracepoint registration with event enabled
1532 register_event(event
);
1534 _lttng_event_unregister(event
);
1537 /* Check if has enablers without bytecode enabled */
1538 list_for_each_entry(enabler_ref
,
1539 &event
->enablers_ref_head
, node
) {
1540 if (enabler_ref
->ref
->enabled
1541 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1542 has_enablers_without_bytecode
= 1;
1546 event
->has_enablers_without_bytecode
=
1547 has_enablers_without_bytecode
;
1549 /* Enable filters */
1550 list_for_each_entry(runtime
,
1551 &event
->bytecode_runtime_head
, node
)
1552 lttng_filter_sync_state(runtime
);
1557 * Apply enablers to session events, adding events to session if need
1558 * be. It is required after each modification applied to an active
1559 * session, and right before session "start".
1560 * "lazy" sync means we only sync if required.
1561 * Should be called with sessions mutex held.
1564 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1566 /* We can skip if session is not active */
1567 if (!session
->active
)
1569 lttng_session_sync_enablers(session
);
1573 * Serialize at most one packet worth of metadata into a metadata
1575 * We grab the metadata cache mutex to get exclusive access to our metadata
1576 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1577 * allows us to do racy operations such as looking for remaining space left in
1578 * packet and write, since mutual exclusion protects us from concurrent writes.
1579 * Mutual exclusion on the metadata cache allow us to read the cache content
1580 * without racing against reallocation of the cache by updates.
1581 * Returns the number of bytes written in the channel, 0 if no data
1582 * was written and a negative value on error.
1584 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
1585 struct channel
*chan
)
1587 struct lib_ring_buffer_ctx ctx
;
1589 size_t len
, reserve_len
;
1592 * Ensure we support mutiple get_next / put sequences followed by
1593 * put_next. The metadata cache lock protects reading the metadata
1594 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1595 * "flush" operations on the buffer invoked by different processes.
1596 * Moreover, since the metadata cache memory can be reallocated, we
1597 * need to have exclusive access against updates even though we only
1600 mutex_lock(&stream
->metadata_cache
->lock
);
1601 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
1602 if (stream
->metadata_in
!= stream
->metadata_out
)
1605 /* Metadata regenerated, change the version. */
1606 if (stream
->metadata_cache
->version
!= stream
->version
)
1607 stream
->version
= stream
->metadata_cache
->version
;
1609 len
= stream
->metadata_cache
->metadata_written
-
1610 stream
->metadata_in
;
1613 reserve_len
= min_t(size_t,
1614 stream
->transport
->ops
.packet_avail_size(chan
),
1616 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
1619 * If reservation failed, return an error to the caller.
1621 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
1623 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
1626 stream
->transport
->ops
.event_write(&ctx
,
1627 stream
->metadata_cache
->data
+ stream
->metadata_in
,
1629 stream
->transport
->ops
.event_commit(&ctx
);
1630 stream
->metadata_in
+= reserve_len
;
1634 mutex_unlock(&stream
->metadata_cache
->lock
);
1639 * Write the metadata to the metadata cache.
1640 * Must be called with sessions_mutex held.
1641 * The metadata cache lock protects us from concurrent read access from
1642 * thread outputting metadata content to ring buffer.
1644 int lttng_metadata_printf(struct lttng_session
*session
,
1645 const char *fmt
, ...)
1650 struct lttng_metadata_stream
*stream
;
1652 WARN_ON_ONCE(!READ_ONCE(session
->active
));
1655 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
1661 mutex_lock(&session
->metadata_cache
->lock
);
1662 if (session
->metadata_cache
->metadata_written
+ len
>
1663 session
->metadata_cache
->cache_alloc
) {
1664 char *tmp_cache_realloc
;
1665 unsigned int tmp_cache_alloc_size
;
1667 tmp_cache_alloc_size
= max_t(unsigned int,
1668 session
->metadata_cache
->cache_alloc
+ len
,
1669 session
->metadata_cache
->cache_alloc
<< 1);
1670 tmp_cache_realloc
= lttng_vzalloc(tmp_cache_alloc_size
);
1671 if (!tmp_cache_realloc
)
1673 if (session
->metadata_cache
->data
) {
1674 memcpy(tmp_cache_realloc
,
1675 session
->metadata_cache
->data
,
1676 session
->metadata_cache
->cache_alloc
);
1677 vfree(session
->metadata_cache
->data
);
1680 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
1681 session
->metadata_cache
->data
= tmp_cache_realloc
;
1683 memcpy(session
->metadata_cache
->data
+
1684 session
->metadata_cache
->metadata_written
,
1686 session
->metadata_cache
->metadata_written
+= len
;
1687 mutex_unlock(&session
->metadata_cache
->lock
);
1690 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
1691 wake_up_interruptible(&stream
->read_wait
);
1696 mutex_unlock(&session
->metadata_cache
->lock
);
1702 int print_tabs(struct lttng_session
*session
, size_t nesting
)
1706 for (i
= 0; i
< nesting
; i
++) {
1709 ret
= lttng_metadata_printf(session
, " ");
1718 * Must be called with sessions_mutex held.
1721 int _lttng_struct_type_statedump(struct lttng_session
*session
,
1722 const struct lttng_type
*type
,
1726 uint32_t i
, nr_fields
;
1728 ret
= print_tabs(session
, nesting
);
1731 ret
= lttng_metadata_printf(session
,
1735 nr_fields
= type
->u
._struct
.nr_fields
;
1736 for (i
= 0; i
< nr_fields
; i
++) {
1737 const struct lttng_event_field
*iter_field
;
1739 iter_field
= &type
->u
._struct
.fields
[i
];
1740 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1744 ret
= print_tabs(session
, nesting
);
1747 ret
= lttng_metadata_printf(session
,
1753 * Must be called with sessions_mutex held.
1756 int _lttng_struct_statedump(struct lttng_session
*session
,
1757 const struct lttng_event_field
*field
,
1762 ret
= _lttng_struct_type_statedump(session
,
1763 &field
->type
, nesting
);
1766 ret
= lttng_metadata_printf(session
,
1773 * Must be called with sessions_mutex held.
1776 int _lttng_variant_type_statedump(struct lttng_session
*session
,
1777 const struct lttng_type
*type
,
1781 uint32_t i
, nr_choices
;
1783 ret
= print_tabs(session
, nesting
);
1786 ret
= lttng_metadata_printf(session
,
1787 "variant <_%s> {\n",
1788 type
->u
.variant
.tag_name
);
1791 nr_choices
= type
->u
.variant
.nr_choices
;
1792 for (i
= 0; i
< nr_choices
; i
++) {
1793 const struct lttng_event_field
*iter_field
;
1795 iter_field
= &type
->u
.variant
.choices
[i
];
1796 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
1800 ret
= print_tabs(session
, nesting
);
1803 ret
= lttng_metadata_printf(session
,
1809 * Must be called with sessions_mutex held.
1812 int _lttng_variant_statedump(struct lttng_session
*session
,
1813 const struct lttng_event_field
*field
,
1818 ret
= _lttng_variant_type_statedump(session
,
1819 &field
->type
, nesting
);
1822 ret
= lttng_metadata_printf(session
,
1829 * Must be called with sessions_mutex held.
1832 int _lttng_array_compound_statedump(struct lttng_session
*session
,
1833 const struct lttng_event_field
*field
,
1837 const struct lttng_type
*elem_type
;
1839 /* Only array of structures and variants are currently supported. */
1840 elem_type
= field
->type
.u
.array_compound
.elem_type
;
1841 switch (elem_type
->atype
) {
1843 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1848 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1855 ret
= lttng_metadata_printf(session
,
1858 field
->type
.u
.array_compound
.length
);
1863 * Must be called with sessions_mutex held.
1866 int _lttng_sequence_compound_statedump(struct lttng_session
*session
,
1867 const struct lttng_event_field
*field
,
1871 const char *length_name
;
1872 const struct lttng_type
*elem_type
;
1874 length_name
= field
->type
.u
.sequence_compound
.length_name
;
1876 /* Only array of structures and variants are currently supported. */
1877 elem_type
= field
->type
.u
.sequence_compound
.elem_type
;
1878 switch (elem_type
->atype
) {
1880 ret
= _lttng_struct_type_statedump(session
, elem_type
, nesting
);
1885 ret
= _lttng_variant_type_statedump(session
, elem_type
, nesting
);
1892 ret
= lttng_metadata_printf(session
,
1900 * Must be called with sessions_mutex held.
1903 int _lttng_enum_statedump(struct lttng_session
*session
,
1904 const struct lttng_event_field
*field
,
1907 const struct lttng_enum_desc
*enum_desc
;
1908 const struct lttng_integer_type
*container_type
;
1910 unsigned int i
, nr_entries
;
1912 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
1913 container_type
= &field
->type
.u
.basic
.enumeration
.container_type
;
1914 nr_entries
= enum_desc
->nr_entries
;
1916 ret
= print_tabs(session
, nesting
);
1919 ret
= lttng_metadata_printf(session
,
1920 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1921 container_type
->size
,
1922 container_type
->alignment
,
1923 container_type
->signedness
,
1924 (container_type
->encoding
== lttng_encode_none
)
1926 : (container_type
->encoding
== lttng_encode_UTF8
)
1929 container_type
->base
,
1930 #if __BYTE_ORDER == __BIG_ENDIAN
1931 container_type
->reverse_byte_order
? " byte_order = le;" : ""
1933 container_type
->reverse_byte_order
? " byte_order = be;" : ""
1938 /* Dump all entries */
1939 for (i
= 0; i
< nr_entries
; i
++) {
1940 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
1943 ret
= print_tabs(session
, nesting
+ 1);
1946 ret
= lttng_metadata_printf(session
,
1950 len
= strlen(entry
->string
);
1951 /* Escape the character '"' */
1952 for (j
= 0; j
< len
; j
++) {
1953 char c
= entry
->string
[j
];
1957 ret
= lttng_metadata_printf(session
,
1961 ret
= lttng_metadata_printf(session
,
1965 ret
= lttng_metadata_printf(session
,
1972 ret
= lttng_metadata_printf(session
, "\"");
1976 if (entry
->options
.is_auto
) {
1977 ret
= lttng_metadata_printf(session
, ",\n");
1981 ret
= lttng_metadata_printf(session
,
1985 if (entry
->start
.signedness
)
1986 ret
= lttng_metadata_printf(session
,
1987 "%lld", (long long) entry
->start
.value
);
1989 ret
= lttng_metadata_printf(session
,
1990 "%llu", entry
->start
.value
);
1993 if (entry
->start
.signedness
== entry
->end
.signedness
&&
1995 == entry
->end
.value
) {
1996 ret
= lttng_metadata_printf(session
,
1999 if (entry
->end
.signedness
) {
2000 ret
= lttng_metadata_printf(session
,
2002 (long long) entry
->end
.value
);
2004 ret
= lttng_metadata_printf(session
,
2013 ret
= print_tabs(session
, nesting
);
2016 ret
= lttng_metadata_printf(session
, "} _%s;\n",
2023 * Must be called with sessions_mutex held.
2026 int _lttng_field_statedump(struct lttng_session
*session
,
2027 const struct lttng_event_field
*field
,
2032 switch (field
->type
.atype
) {
2034 ret
= print_tabs(session
, nesting
);
2037 ret
= lttng_metadata_printf(session
,
2038 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2039 field
->type
.u
.basic
.integer
.size
,
2040 field
->type
.u
.basic
.integer
.alignment
,
2041 field
->type
.u
.basic
.integer
.signedness
,
2042 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
2044 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2047 field
->type
.u
.basic
.integer
.base
,
2048 #if __BYTE_ORDER == __BIG_ENDIAN
2049 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2051 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2056 ret
= _lttng_enum_statedump(session
, field
, nesting
);
2060 const struct lttng_basic_type
*elem_type
;
2062 elem_type
= &field
->type
.u
.array
.elem_type
;
2063 if (field
->type
.u
.array
.elem_alignment
) {
2064 ret
= print_tabs(session
, nesting
);
2067 ret
= lttng_metadata_printf(session
,
2068 "struct { } align(%u) _%s_padding;\n",
2069 field
->type
.u
.array
.elem_alignment
* CHAR_BIT
,
2074 ret
= print_tabs(session
, nesting
);
2077 ret
= lttng_metadata_printf(session
,
2078 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2079 elem_type
->u
.basic
.integer
.size
,
2080 elem_type
->u
.basic
.integer
.alignment
,
2081 elem_type
->u
.basic
.integer
.signedness
,
2082 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2084 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2087 elem_type
->u
.basic
.integer
.base
,
2088 #if __BYTE_ORDER == __BIG_ENDIAN
2089 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2091 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2093 field
->name
, field
->type
.u
.array
.length
);
2096 case atype_sequence
:
2098 const struct lttng_basic_type
*elem_type
;
2099 const struct lttng_basic_type
*length_type
;
2101 elem_type
= &field
->type
.u
.sequence
.elem_type
;
2102 length_type
= &field
->type
.u
.sequence
.length_type
;
2103 ret
= print_tabs(session
, nesting
);
2106 ret
= lttng_metadata_printf(session
,
2107 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2108 length_type
->u
.basic
.integer
.size
,
2109 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
2110 length_type
->u
.basic
.integer
.signedness
,
2111 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2113 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2116 length_type
->u
.basic
.integer
.base
,
2117 #if __BYTE_ORDER == __BIG_ENDIAN
2118 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2120 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2126 if (field
->type
.u
.sequence
.elem_alignment
) {
2127 ret
= print_tabs(session
, nesting
);
2130 ret
= lttng_metadata_printf(session
,
2131 "struct { } align(%u) _%s_padding;\n",
2132 field
->type
.u
.sequence
.elem_alignment
* CHAR_BIT
,
2137 ret
= print_tabs(session
, nesting
);
2140 ret
= lttng_metadata_printf(session
,
2141 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2142 elem_type
->u
.basic
.integer
.size
,
2143 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
2144 elem_type
->u
.basic
.integer
.signedness
,
2145 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
2147 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
2150 elem_type
->u
.basic
.integer
.base
,
2151 #if __BYTE_ORDER == __BIG_ENDIAN
2152 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
2154 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
2162 /* Default encoding is UTF8 */
2163 ret
= print_tabs(session
, nesting
);
2166 ret
= lttng_metadata_printf(session
,
2168 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
2169 " { encoding = ASCII; }" : "",
2173 ret
= _lttng_struct_statedump(session
, field
, nesting
);
2175 case atype_array_compound
:
2176 ret
= _lttng_array_compound_statedump(session
, field
, nesting
);
2178 case atype_sequence_compound
:
2179 ret
= _lttng_sequence_compound_statedump(session
, field
, nesting
);
2182 ret
= _lttng_variant_statedump(session
, field
, nesting
);
2193 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2194 struct lttng_ctx
*ctx
)
2201 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2202 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2204 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2212 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2213 struct lttng_event
*event
)
2215 const struct lttng_event_desc
*desc
= event
->desc
;
2219 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2220 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2222 ret
= _lttng_field_statedump(session
, field
, 2);
2230 * Must be called with sessions_mutex held.
2233 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2234 struct lttng_channel
*chan
,
2235 struct lttng_event
*event
)
2239 if (event
->metadata_dumped
|| !READ_ONCE(session
->active
))
2241 if (chan
->channel_type
== METADATA_CHANNEL
)
2244 ret
= lttng_metadata_printf(session
,
2248 " stream_id = %u;\n",
2256 ret
= lttng_metadata_printf(session
,
2257 " context := struct {\n");
2261 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2265 ret
= lttng_metadata_printf(session
,
2271 ret
= lttng_metadata_printf(session
,
2272 " fields := struct {\n"
2277 ret
= _lttng_fields_metadata_statedump(session
, event
);
2282 * LTTng space reservation can only reserve multiples of the
2285 ret
= lttng_metadata_printf(session
,
2291 event
->metadata_dumped
= 1;
2298 * Must be called with sessions_mutex held.
2301 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2302 struct lttng_channel
*chan
)
2306 if (chan
->metadata_dumped
|| !READ_ONCE(session
->active
))
2309 if (chan
->channel_type
== METADATA_CHANNEL
)
2312 WARN_ON_ONCE(!chan
->header_type
);
2313 ret
= lttng_metadata_printf(session
,
2316 " event.header := %s;\n"
2317 " packet.context := struct packet_context;\n",
2319 chan
->header_type
== 1 ? "struct event_header_compact" :
2320 "struct event_header_large");
2325 ret
= lttng_metadata_printf(session
,
2326 " event.context := struct {\n");
2330 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2334 ret
= lttng_metadata_printf(session
,
2340 ret
= lttng_metadata_printf(session
,
2343 chan
->metadata_dumped
= 1;
2349 * Must be called with sessions_mutex held.
2352 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
2354 return lttng_metadata_printf(session
,
2355 "struct packet_context {\n"
2356 " uint64_clock_monotonic_t timestamp_begin;\n"
2357 " uint64_clock_monotonic_t timestamp_end;\n"
2358 " uint64_t content_size;\n"
2359 " uint64_t packet_size;\n"
2360 " uint64_t packet_seq_num;\n"
2361 " unsigned long events_discarded;\n"
2362 " uint32_t cpu_id;\n"
2369 * id: range: 0 - 30.
2370 * id 31 is reserved to indicate an extended header.
2373 * id: range: 0 - 65534.
2374 * id 65535 is reserved to indicate an extended header.
2376 * Must be called with sessions_mutex held.
2379 int _lttng_event_header_declare(struct lttng_session
*session
)
2381 return lttng_metadata_printf(session
,
2382 "struct event_header_compact {\n"
2383 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2386 " uint27_clock_monotonic_t timestamp;\n"
2390 " uint64_clock_monotonic_t timestamp;\n"
2395 "struct event_header_large {\n"
2396 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2399 " uint32_clock_monotonic_t timestamp;\n"
2403 " uint64_clock_monotonic_t timestamp;\n"
2407 lttng_alignof(uint32_t) * CHAR_BIT
,
2408 lttng_alignof(uint16_t) * CHAR_BIT
2413 * Approximation of NTP time of day to clock monotonic correlation,
2414 * taken at start of trace.
2415 * Yes, this is only an approximation. Yes, we can (and will) do better
2416 * in future versions.
2417 * This function may return a negative offset. It may happen if the
2418 * system sets the REALTIME clock to 0 after boot.
2420 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2424 int64_t measure_clock_offset(void)
2426 uint64_t monotonic_avg
, monotonic
[2], realtime
;
2427 uint64_t tcf
= trace_clock_freq();
2429 unsigned long flags
;
2430 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
2431 struct timespec64 rts
= { 0, 0 };
2433 struct timespec rts
= { 0, 0 };
2436 /* Disable interrupts to increase correlation precision. */
2437 local_irq_save(flags
);
2438 monotonic
[0] = trace_clock_read64();
2439 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
2440 ktime_get_real_ts64(&rts
);
2442 getnstimeofday(&rts
);
2444 monotonic
[1] = trace_clock_read64();
2445 local_irq_restore(flags
);
2447 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
2448 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
2449 if (tcf
== NSEC_PER_SEC
) {
2450 realtime
+= rts
.tv_nsec
;
2452 uint64_t n
= rts
.tv_nsec
* tcf
;
2454 do_div(n
, NSEC_PER_SEC
);
2457 offset
= (int64_t) realtime
- monotonic_avg
;
2462 * Output metadata into this session's metadata buffers.
2463 * Must be called with sessions_mutex held.
2466 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
2468 unsigned char *uuid_c
= session
->uuid
.b
;
2469 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
2470 struct lttng_channel
*chan
;
2471 struct lttng_event
*event
;
2474 if (!READ_ONCE(session
->active
))
2476 if (session
->metadata_dumped
)
2479 snprintf(uuid_s
, sizeof(uuid_s
),
2480 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2481 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
2482 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
2483 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
2484 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
2486 ret
= lttng_metadata_printf(session
,
2487 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2488 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2489 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2490 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2491 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2492 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2493 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2499 " byte_order = %s;\n"
2500 " packet.header := struct {\n"
2501 " uint32_t magic;\n"
2502 " uint8_t uuid[16];\n"
2503 " uint32_t stream_id;\n"
2504 " uint64_t stream_instance_id;\n"
2507 lttng_alignof(uint8_t) * CHAR_BIT
,
2508 lttng_alignof(uint16_t) * CHAR_BIT
,
2509 lttng_alignof(uint32_t) * CHAR_BIT
,
2510 lttng_alignof(uint64_t) * CHAR_BIT
,
2511 sizeof(unsigned long) * CHAR_BIT
,
2512 lttng_alignof(unsigned long) * CHAR_BIT
,
2516 #if __BYTE_ORDER == __BIG_ENDIAN
2525 ret
= lttng_metadata_printf(session
,
2527 " hostname = \"%s\";\n"
2528 " domain = \"kernel\";\n"
2529 " sysname = \"%s\";\n"
2530 " kernel_release = \"%s\";\n"
2531 " kernel_version = \"%s\";\n"
2532 " tracer_name = \"lttng-modules\";\n"
2533 " tracer_major = %d;\n"
2534 " tracer_minor = %d;\n"
2535 " tracer_patchlevel = %d;\n"
2537 current
->nsproxy
->uts_ns
->name
.nodename
,
2541 LTTNG_MODULES_MAJOR_VERSION
,
2542 LTTNG_MODULES_MINOR_VERSION
,
2543 LTTNG_MODULES_PATCHLEVEL_VERSION
2548 ret
= lttng_metadata_printf(session
,
2550 " name = \"%s\";\n",
2556 if (!trace_clock_uuid(clock_uuid_s
)) {
2557 ret
= lttng_metadata_printf(session
,
2558 " uuid = \"%s\";\n",
2565 ret
= lttng_metadata_printf(session
,
2566 " description = \"%s\";\n"
2567 " freq = %llu; /* Frequency, in Hz */\n"
2568 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2571 trace_clock_description(),
2572 (unsigned long long) trace_clock_freq(),
2573 (long long) measure_clock_offset()
2578 ret
= lttng_metadata_printf(session
,
2579 "typealias integer {\n"
2580 " size = 27; align = 1; signed = false;\n"
2581 " map = clock.%s.value;\n"
2582 "} := uint27_clock_monotonic_t;\n"
2584 "typealias integer {\n"
2585 " size = 32; align = %u; signed = false;\n"
2586 " map = clock.%s.value;\n"
2587 "} := uint32_clock_monotonic_t;\n"
2589 "typealias integer {\n"
2590 " size = 64; align = %u; signed = false;\n"
2591 " map = clock.%s.value;\n"
2592 "} := uint64_clock_monotonic_t;\n\n",
2594 lttng_alignof(uint32_t) * CHAR_BIT
,
2596 lttng_alignof(uint64_t) * CHAR_BIT
,
2602 ret
= _lttng_stream_packet_context_declare(session
);
2606 ret
= _lttng_event_header_declare(session
);
2611 list_for_each_entry(chan
, &session
->chan
, list
) {
2612 ret
= _lttng_channel_metadata_statedump(session
, chan
);
2617 list_for_each_entry(event
, &session
->events
, list
) {
2618 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
2622 session
->metadata_dumped
= 1;
2628 * lttng_transport_register - LTT transport registration
2629 * @transport: transport structure
2631 * Registers a transport which can be used as output to extract the data out of
2632 * LTTng. The module calling this registration function must ensure that no
2633 * trap-inducing code will be executed by the transport functions. E.g.
2634 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2635 * is made visible to the transport function. This registration acts as a
2636 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2637 * after its registration must it synchronize the TLBs.
2639 void lttng_transport_register(struct lttng_transport
*transport
)
2642 * Make sure no page fault can be triggered by the module about to be
2643 * registered. We deal with this here so we don't have to call
2644 * vmalloc_sync_all() in each module's init.
2646 wrapper_vmalloc_sync_all();
2648 mutex_lock(&sessions_mutex
);
2649 list_add_tail(&transport
->node
, <tng_transport_list
);
2650 mutex_unlock(&sessions_mutex
);
2652 EXPORT_SYMBOL_GPL(lttng_transport_register
);
2655 * lttng_transport_unregister - LTT transport unregistration
2656 * @transport: transport structure
2658 void lttng_transport_unregister(struct lttng_transport
*transport
)
2660 mutex_lock(&sessions_mutex
);
2661 list_del(&transport
->node
);
2662 mutex_unlock(&sessions_mutex
);
2664 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
2666 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2668 enum cpuhp_state lttng_hp_prepare
;
2669 enum cpuhp_state lttng_hp_online
;
2671 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
2673 struct lttng_cpuhp_node
*lttng_node
;
2675 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2676 switch (lttng_node
->component
) {
2677 case LTTNG_RING_BUFFER_FRONTEND
:
2679 case LTTNG_RING_BUFFER_BACKEND
:
2680 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
2681 case LTTNG_RING_BUFFER_ITER
:
2683 case LTTNG_CONTEXT_PERF_COUNTERS
:
2690 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
2692 struct lttng_cpuhp_node
*lttng_node
;
2694 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2695 switch (lttng_node
->component
) {
2696 case LTTNG_RING_BUFFER_FRONTEND
:
2697 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
2698 case LTTNG_RING_BUFFER_BACKEND
:
2700 case LTTNG_RING_BUFFER_ITER
:
2702 case LTTNG_CONTEXT_PERF_COUNTERS
:
2703 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
2709 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
2711 struct lttng_cpuhp_node
*lttng_node
;
2713 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2714 switch (lttng_node
->component
) {
2715 case LTTNG_RING_BUFFER_FRONTEND
:
2716 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
2717 case LTTNG_RING_BUFFER_BACKEND
:
2719 case LTTNG_RING_BUFFER_ITER
:
2720 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
2721 case LTTNG_CONTEXT_PERF_COUNTERS
:
2722 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
2728 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
2730 struct lttng_cpuhp_node
*lttng_node
;
2732 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
2733 switch (lttng_node
->component
) {
2734 case LTTNG_RING_BUFFER_FRONTEND
:
2735 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
2736 case LTTNG_RING_BUFFER_BACKEND
:
2738 case LTTNG_RING_BUFFER_ITER
:
2740 case LTTNG_CONTEXT_PERF_COUNTERS
:
2747 static int __init
lttng_init_cpu_hotplug(void)
2751 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
2752 lttng_hotplug_prepare
,
2753 lttng_hotplug_dead
);
2757 lttng_hp_prepare
= ret
;
2758 lttng_rb_set_hp_prepare(ret
);
2760 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
2761 lttng_hotplug_online
,
2762 lttng_hotplug_offline
);
2764 cpuhp_remove_multi_state(lttng_hp_prepare
);
2765 lttng_hp_prepare
= 0;
2768 lttng_hp_online
= ret
;
2769 lttng_rb_set_hp_online(ret
);
2774 static void __exit
lttng_exit_cpu_hotplug(void)
2776 lttng_rb_set_hp_online(0);
2777 cpuhp_remove_multi_state(lttng_hp_online
);
2778 lttng_rb_set_hp_prepare(0);
2779 cpuhp_remove_multi_state(lttng_hp_prepare
);
2782 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2783 static int lttng_init_cpu_hotplug(void)
2787 static void lttng_exit_cpu_hotplug(void)
2790 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2793 static int __init
lttng_events_init(void)
2797 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
2800 ret
= wrapper_get_pfnblock_flags_mask_init();
2803 ret
= wrapper_get_pageblock_flags_mask_init();
2806 ret
= lttng_probes_init();
2809 ret
= lttng_context_init();
2812 ret
= lttng_tracepoint_init();
2815 event_cache
= KMEM_CACHE(lttng_event
, 0);
2820 ret
= lttng_abi_init();
2823 ret
= lttng_logger_init();
2826 ret
= lttng_init_cpu_hotplug();
2829 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2830 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2831 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2832 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2833 LTTNG_MODULES_EXTRAVERSION
,
2835 #ifdef LTTNG_EXTRA_VERSION_GIT
2836 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2840 #ifdef LTTNG_EXTRA_VERSION_NAME
2841 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2848 lttng_logger_exit();
2852 kmem_cache_destroy(event_cache
);
2854 lttng_tracepoint_exit();
2856 lttng_context_exit();
2857 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2858 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2859 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2860 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2861 LTTNG_MODULES_EXTRAVERSION
,
2863 #ifdef LTTNG_EXTRA_VERSION_GIT
2864 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2868 #ifdef LTTNG_EXTRA_VERSION_NAME
2869 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2876 module_init(lttng_events_init
);
2878 static void __exit
lttng_events_exit(void)
2880 struct lttng_session
*session
, *tmpsession
;
2882 lttng_exit_cpu_hotplug();
2883 lttng_logger_exit();
2885 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
2886 lttng_session_destroy(session
);
2887 kmem_cache_destroy(event_cache
);
2888 lttng_tracepoint_exit();
2889 lttng_context_exit();
2890 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2891 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
2892 __stringify(LTTNG_MODULES_MINOR_VERSION
),
2893 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
2894 LTTNG_MODULES_EXTRAVERSION
,
2896 #ifdef LTTNG_EXTRA_VERSION_GIT
2897 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
2901 #ifdef LTTNG_EXTRA_VERSION_NAME
2902 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
2908 module_exit(lttng_events_exit
);
2910 #include "extra_version/patches.i"
2911 #ifdef LTTNG_EXTRA_VERSION_GIT
2912 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
2914 #ifdef LTTNG_EXTRA_VERSION_NAME
2915 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
2917 MODULE_LICENSE("GPL and additional rights");
2918 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2919 MODULE_DESCRIPTION("LTTng Events");
2920 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
2921 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
2922 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
2923 LTTNG_MODULES_EXTRAVERSION
);