1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/events-internal.h>
40 #include <lttng/lttng-bytecode.h>
41 #include <lttng/tracer.h>
42 #include <lttng/event-notifier-notification.h>
43 #include <lttng/abi-old.h>
44 #include <lttng/endian.h>
45 #include <lttng/string-utils.h>
46 #include <lttng/utils.h>
47 #include <ringbuffer/backend.h>
48 #include <ringbuffer/frontend.h>
49 #include <wrapper/time.h>
51 #define METADATA_CACHE_DEFAULT_SIZE 4096
53 static LIST_HEAD(sessions
);
54 static LIST_HEAD(event_notifier_groups
);
55 static LIST_HEAD(lttng_transport_list
);
56 static LIST_HEAD(lttng_counter_transport_list
);
58 * Protect the sessions and metadata caches.
60 static DEFINE_MUTEX(sessions_mutex
);
61 static struct kmem_cache
*event_recorder_cache
;
62 static struct kmem_cache
*event_recorder_private_cache
;
63 static struct kmem_cache
*event_notifier_cache
;
64 static struct kmem_cache
*event_notifier_private_cache
;
66 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
67 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
68 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
69 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
70 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event
);
75 static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
77 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
78 struct lttng_channel
*chan
,
79 struct lttng_kernel_event_recorder
*event
);
81 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
83 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
85 int _lttng_type_statedump(struct lttng_session
*session
,
86 const struct lttng_kernel_type_common
*type
,
87 enum lttng_kernel_string_encoding parent_encoding
,
90 int _lttng_field_statedump(struct lttng_session
*session
,
91 const struct lttng_kernel_event_field
*field
,
94 void synchronize_trace(void)
96 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
102 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
103 #ifdef CONFIG_PREEMPT_RT_FULL
106 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
107 #ifdef CONFIG_PREEMPT_RT
110 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
113 void lttng_lock_sessions(void)
115 mutex_lock(&sessions_mutex
);
118 void lttng_unlock_sessions(void)
120 mutex_unlock(&sessions_mutex
);
123 static struct lttng_transport
*lttng_transport_find(const char *name
)
125 struct lttng_transport
*transport
;
127 list_for_each_entry(transport
, <tng_transport_list
, node
) {
128 if (!strcmp(transport
->name
, name
))
135 * Called with sessions lock held.
137 int lttng_session_active(void)
139 struct lttng_session
*iter
;
141 list_for_each_entry(iter
, &sessions
, list
) {
148 struct lttng_session
*lttng_session_create(void)
150 struct lttng_session
*session
;
151 struct lttng_metadata_cache
*metadata_cache
;
154 mutex_lock(&sessions_mutex
);
155 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
158 INIT_LIST_HEAD(&session
->chan
);
159 INIT_LIST_HEAD(&session
->events
);
160 lttng_guid_gen(&session
->uuid
);
162 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
165 goto err_free_session
;
166 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
167 if (!metadata_cache
->data
)
169 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
170 kref_init(&metadata_cache
->refcount
);
171 mutex_init(&metadata_cache
->lock
);
172 session
->metadata_cache
= metadata_cache
;
173 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
174 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
175 sizeof(metadata_cache
->uuid
));
176 INIT_LIST_HEAD(&session
->enablers_head
);
177 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
178 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
179 list_add(&session
->list
, &sessions
);
180 session
->pid_tracker
.session
= session
;
181 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
182 session
->vpid_tracker
.session
= session
;
183 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
184 session
->uid_tracker
.session
= session
;
185 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
186 session
->vuid_tracker
.session
= session
;
187 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
188 session
->gid_tracker
.session
= session
;
189 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
190 session
->vgid_tracker
.session
= session
;
191 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
192 mutex_unlock(&sessions_mutex
);
196 kfree(metadata_cache
);
198 lttng_kvfree(session
);
200 mutex_unlock(&sessions_mutex
);
205 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
207 struct lttng_counter_transport
*transport
;
209 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
210 if (!strcmp(transport
->name
, name
))
216 struct lttng_counter
*lttng_kernel_counter_create(
217 const char *counter_transport_name
,
218 size_t number_dimensions
, const size_t *dimensions_sizes
)
220 struct lttng_counter
*counter
= NULL
;
221 struct lttng_counter_transport
*counter_transport
= NULL
;
223 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
224 if (!counter_transport
) {
225 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
226 counter_transport_name
);
229 if (!try_module_get(counter_transport
->owner
)) {
230 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
234 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
238 /* Create event notifier error counter. */
239 counter
->ops
= &counter_transport
->ops
;
240 counter
->transport
= counter_transport
;
242 counter
->counter
= counter
->ops
->counter_create(
243 number_dimensions
, dimensions_sizes
, 0);
244 if (!counter
->counter
) {
251 lttng_kvfree(counter
);
253 if (counter_transport
)
254 module_put(counter_transport
->owner
);
259 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
261 struct lttng_transport
*transport
= NULL
;
262 struct lttng_event_notifier_group
*event_notifier_group
;
263 const char *transport_name
= "relay-event-notifier";
264 size_t subbuf_size
= 4096; //TODO
265 size_t num_subbuf
= 16; //TODO
266 unsigned int switch_timer_interval
= 0;
267 unsigned int read_timer_interval
= 0;
270 mutex_lock(&sessions_mutex
);
272 transport
= lttng_transport_find(transport_name
);
274 printk(KERN_WARNING
"LTTng: transport %s not found\n",
278 if (!try_module_get(transport
->owner
)) {
279 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
284 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
286 if (!event_notifier_group
)
290 * Initialize the ring buffer used to store event notifier
293 event_notifier_group
->ops
= &transport
->ops
;
294 event_notifier_group
->chan
= transport
->ops
.channel_create(
295 transport_name
, event_notifier_group
, NULL
,
296 subbuf_size
, num_subbuf
, switch_timer_interval
,
297 read_timer_interval
);
298 if (!event_notifier_group
->chan
)
301 event_notifier_group
->transport
= transport
;
303 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
304 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
305 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
306 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
308 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
310 mutex_unlock(&sessions_mutex
);
312 return event_notifier_group
;
315 lttng_kvfree(event_notifier_group
);
318 module_put(transport
->owner
);
320 mutex_unlock(&sessions_mutex
);
324 void metadata_cache_destroy(struct kref
*kref
)
326 struct lttng_metadata_cache
*cache
=
327 container_of(kref
, struct lttng_metadata_cache
, refcount
);
332 void lttng_session_destroy(struct lttng_session
*session
)
334 struct lttng_channel
*chan
, *tmpchan
;
335 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
336 struct lttng_metadata_stream
*metadata_stream
;
337 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
340 mutex_lock(&sessions_mutex
);
341 WRITE_ONCE(session
->active
, 0);
342 list_for_each_entry(chan
, &session
->chan
, list
) {
343 ret
= lttng_syscalls_unregister_channel(chan
);
346 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
347 ret
= _lttng_event_unregister(event_recorder_priv
->pub
);
350 synchronize_trace(); /* Wait for in-flight events to complete */
351 list_for_each_entry(chan
, &session
->chan
, list
) {
352 ret
= lttng_syscalls_destroy_event(chan
);
355 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
356 &session
->enablers_head
, node
)
357 lttng_event_enabler_destroy(event_enabler
);
358 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->events
, node
)
359 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
360 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
361 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
362 _lttng_channel_destroy(chan
);
364 mutex_lock(&session
->metadata_cache
->lock
);
365 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
366 _lttng_metadata_channel_hangup(metadata_stream
);
367 mutex_unlock(&session
->metadata_cache
->lock
);
368 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
369 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
370 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
371 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
372 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
373 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
374 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
375 list_del(&session
->list
);
376 mutex_unlock(&sessions_mutex
);
377 lttng_kvfree(session
);
380 void lttng_event_notifier_group_destroy(
381 struct lttng_event_notifier_group
*event_notifier_group
)
383 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
384 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
387 if (!event_notifier_group
)
390 mutex_lock(&sessions_mutex
);
392 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
395 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
396 &event_notifier_group
->event_notifiers_head
, node
) {
397 ret
= _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
401 /* Wait for in-flight event notifier to complete */
404 irq_work_sync(&event_notifier_group
->wakeup_pending
);
406 kfree(event_notifier_group
->sc_filter
);
408 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
409 &event_notifier_group
->enablers_head
, node
)
410 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
412 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
413 &event_notifier_group
->event_notifiers_head
, node
)
414 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
416 if (event_notifier_group
->error_counter
) {
417 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
419 error_counter
->ops
->counter_destroy(error_counter
->counter
);
420 module_put(error_counter
->transport
->owner
);
421 lttng_kvfree(error_counter
);
422 event_notifier_group
->error_counter
= NULL
;
425 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
426 module_put(event_notifier_group
->transport
->owner
);
427 list_del(&event_notifier_group
->node
);
429 mutex_unlock(&sessions_mutex
);
430 lttng_kvfree(event_notifier_group
);
433 int lttng_session_statedump(struct lttng_session
*session
)
437 mutex_lock(&sessions_mutex
);
438 ret
= lttng_statedump_start(session
);
439 mutex_unlock(&sessions_mutex
);
443 int lttng_session_enable(struct lttng_session
*session
)
446 struct lttng_channel
*chan
;
448 mutex_lock(&sessions_mutex
);
449 if (session
->active
) {
454 /* Set transient enabler state to "enabled" */
457 /* We need to sync enablers with session before activation. */
458 lttng_session_sync_event_enablers(session
);
461 * Snapshot the number of events per channel to know the type of header
464 list_for_each_entry(chan
, &session
->chan
, list
) {
465 if (chan
->header_type
)
466 continue; /* don't change it if session stop/restart */
467 if (chan
->free_event_id
< 31)
468 chan
->header_type
= 1; /* compact */
470 chan
->header_type
= 2; /* large */
473 /* Clear each stream's quiescent state. */
474 list_for_each_entry(chan
, &session
->chan
, list
) {
475 if (chan
->channel_type
!= METADATA_CHANNEL
)
476 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
479 WRITE_ONCE(session
->active
, 1);
480 WRITE_ONCE(session
->been_active
, 1);
481 ret
= _lttng_session_metadata_statedump(session
);
483 WRITE_ONCE(session
->active
, 0);
486 ret
= lttng_statedump_start(session
);
488 WRITE_ONCE(session
->active
, 0);
490 mutex_unlock(&sessions_mutex
);
494 int lttng_session_disable(struct lttng_session
*session
)
497 struct lttng_channel
*chan
;
499 mutex_lock(&sessions_mutex
);
500 if (!session
->active
) {
504 WRITE_ONCE(session
->active
, 0);
506 /* Set transient enabler state to "disabled" */
508 lttng_session_sync_event_enablers(session
);
510 /* Set each stream's quiescent state. */
511 list_for_each_entry(chan
, &session
->chan
, list
) {
512 if (chan
->channel_type
!= METADATA_CHANNEL
)
513 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
516 mutex_unlock(&sessions_mutex
);
520 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
523 struct lttng_channel
*chan
;
524 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
525 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
526 struct lttng_metadata_stream
*stream
;
528 mutex_lock(&sessions_mutex
);
529 if (!session
->active
) {
534 mutex_lock(&cache
->lock
);
535 memset(cache
->data
, 0, cache
->cache_alloc
);
536 cache
->metadata_written
= 0;
538 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
539 stream
->metadata_out
= 0;
540 stream
->metadata_in
= 0;
542 mutex_unlock(&cache
->lock
);
544 session
->metadata_dumped
= 0;
545 list_for_each_entry(chan
, &session
->chan
, list
) {
546 chan
->metadata_dumped
= 0;
549 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
550 event_recorder_priv
->metadata_dumped
= 0;
553 ret
= _lttng_session_metadata_statedump(session
);
556 mutex_unlock(&sessions_mutex
);
560 int lttng_channel_enable(struct lttng_channel
*channel
)
564 mutex_lock(&sessions_mutex
);
565 if (channel
->channel_type
== METADATA_CHANNEL
) {
569 if (channel
->enabled
) {
573 /* Set transient enabler state to "enabled" */
575 lttng_session_sync_event_enablers(channel
->session
);
576 /* Set atomically the state to "enabled" */
577 WRITE_ONCE(channel
->enabled
, 1);
579 mutex_unlock(&sessions_mutex
);
583 int lttng_channel_disable(struct lttng_channel
*channel
)
587 mutex_lock(&sessions_mutex
);
588 if (channel
->channel_type
== METADATA_CHANNEL
) {
592 if (!channel
->enabled
) {
596 /* Set atomically the state to "disabled" */
597 WRITE_ONCE(channel
->enabled
, 0);
598 /* Set transient enabler state to "enabled" */
600 lttng_session_sync_event_enablers(channel
->session
);
602 mutex_unlock(&sessions_mutex
);
606 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
610 mutex_lock(&sessions_mutex
);
611 switch (event
->type
) {
612 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
614 struct lttng_kernel_event_recorder
*event_recorder
=
615 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
617 if (event_recorder
->chan
->channel_type
== METADATA_CHANNEL
) {
623 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
624 switch (event
->priv
->instrumentation
) {
625 case LTTNG_KERNEL_ABI_KRETPROBE
:
636 if (event
->enabled
) {
640 switch (event
->priv
->instrumentation
) {
641 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
642 case LTTNG_KERNEL_ABI_SYSCALL
:
646 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
647 case LTTNG_KERNEL_ABI_UPROBE
:
648 WRITE_ONCE(event
->enabled
, 1);
651 case LTTNG_KERNEL_ABI_KRETPROBE
:
652 ret
= lttng_kretprobes_event_enable_state(event
, 1);
655 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
656 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
662 mutex_unlock(&sessions_mutex
);
666 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
670 mutex_lock(&sessions_mutex
);
671 switch (event
->type
) {
672 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
674 struct lttng_kernel_event_recorder
*event_recorder
=
675 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
677 if (event_recorder
->chan
->channel_type
== METADATA_CHANNEL
) {
683 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
684 switch (event
->priv
->instrumentation
) {
685 case LTTNG_KERNEL_ABI_KRETPROBE
:
696 if (!event
->enabled
) {
700 switch (event
->priv
->instrumentation
) {
701 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
702 case LTTNG_KERNEL_ABI_SYSCALL
:
706 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
707 case LTTNG_KERNEL_ABI_UPROBE
:
708 WRITE_ONCE(event
->enabled
, 0);
711 case LTTNG_KERNEL_ABI_KRETPROBE
:
712 ret
= lttng_kretprobes_event_enable_state(event
, 0);
715 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
716 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
722 mutex_unlock(&sessions_mutex
);
726 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
727 const char *transport_name
,
729 size_t subbuf_size
, size_t num_subbuf
,
730 unsigned int switch_timer_interval
,
731 unsigned int read_timer_interval
,
732 enum channel_type channel_type
)
734 struct lttng_channel
*chan
;
735 struct lttng_transport
*transport
= NULL
;
737 mutex_lock(&sessions_mutex
);
738 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
739 goto active
; /* Refuse to add channel to active session */
740 transport
= lttng_transport_find(transport_name
);
742 printk(KERN_WARNING
"LTTng: transport %s not found\n",
746 if (!try_module_get(transport
->owner
)) {
747 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
750 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
753 chan
->session
= session
;
754 chan
->id
= session
->free_chan_id
++;
755 chan
->ops
= &transport
->ops
;
757 * Note: the channel creation op already writes into the packet
758 * headers. Therefore the "chan" information used as input
759 * should be already accessible.
761 chan
->chan
= transport
->ops
.channel_create(transport_name
,
762 chan
, buf_addr
, subbuf_size
, num_subbuf
,
763 switch_timer_interval
, read_timer_interval
);
768 chan
->transport
= transport
;
769 chan
->channel_type
= channel_type
;
770 list_add(&chan
->list
, &session
->chan
);
771 mutex_unlock(&sessions_mutex
);
778 module_put(transport
->owner
);
781 mutex_unlock(&sessions_mutex
);
786 * Only used internally at session destruction for per-cpu channels, and
787 * when metadata channel is released.
788 * Needs to be called with sessions mutex held.
791 void _lttng_channel_destroy(struct lttng_channel
*chan
)
793 chan
->ops
->channel_destroy(chan
->chan
);
794 module_put(chan
->transport
->owner
);
795 list_del(&chan
->list
);
796 lttng_kernel_destroy_context(chan
->ctx
);
800 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
802 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
804 /* Protect the metadata cache with the sessions_mutex. */
805 mutex_lock(&sessions_mutex
);
806 _lttng_channel_destroy(chan
);
807 mutex_unlock(&sessions_mutex
);
809 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
812 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
814 stream
->finalized
= 1;
815 wake_up_interruptible(&stream
->read_wait
);
820 * Supports event creation while tracing session is active.
821 * Needs to be called with sessions mutex held.
823 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_channel
*chan
,
824 struct lttng_kernel_abi_event
*event_param
,
825 const struct lttng_kernel_event_desc
*event_desc
,
826 enum lttng_kernel_abi_instrumentation itype
)
828 struct lttng_session
*session
= chan
->session
;
829 struct lttng_kernel_event_recorder
*event_recorder
;
830 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
831 const char *event_name
;
832 struct hlist_head
*head
;
835 if (chan
->free_event_id
== -1U) {
841 case LTTNG_KERNEL_ABI_TRACEPOINT
:
842 event_name
= event_desc
->event_name
;
845 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
846 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
847 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
848 case LTTNG_KERNEL_ABI_SYSCALL
:
849 event_name
= event_param
->name
;
852 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
853 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
860 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
861 LTTNG_EVENT_HT_SIZE
, event_name
);
862 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
863 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
864 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
865 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
866 && chan
== event_recorder_priv
->pub
->chan
) {
872 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
873 if (!event_recorder
) {
877 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
878 if (!event_recorder_priv
) {
880 goto cache_private_error
;
882 event_recorder_priv
->pub
= event_recorder
;
883 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
884 event_recorder
->priv
= event_recorder_priv
;
885 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
886 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
888 event_recorder
->chan
= chan
;
889 event_recorder
->priv
->id
= chan
->free_event_id
++;
890 event_recorder
->priv
->parent
.instrumentation
= itype
;
891 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
892 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
895 case LTTNG_KERNEL_ABI_TRACEPOINT
:
896 /* Event will be enabled by enabler sync. */
897 event_recorder
->parent
.enabled
= 0;
898 event_recorder
->priv
->parent
.registered
= 0;
899 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
900 if (!event_recorder
->priv
->parent
.desc
) {
904 /* Populate lttng_event structure before event registration. */
908 case LTTNG_KERNEL_ABI_KPROBE
:
910 * Needs to be explicitly enabled after creation, since
911 * we may want to apply filters.
913 event_recorder
->parent
.enabled
= 0;
914 event_recorder
->priv
->parent
.registered
= 1;
916 * Populate lttng_event structure before event
920 ret
= lttng_kprobes_register_event(event_name
,
921 event_param
->u
.kprobe
.symbol_name
,
922 event_param
->u
.kprobe
.offset
,
923 event_param
->u
.kprobe
.addr
,
929 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
933 case LTTNG_KERNEL_ABI_KRETPROBE
:
935 struct lttng_kernel_event_recorder
*event_recorder_return
;
936 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
938 /* kretprobe defines 2 events */
940 * Needs to be explicitly enabled after creation, since
941 * we may want to apply filters.
943 event_recorder
->parent
.enabled
= 0;
944 event_recorder
->priv
->parent
.registered
= 1;
946 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
947 if (!event_recorder_return
) {
951 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
952 if (!event_recorder_return_priv
) {
953 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
957 event_recorder_return_priv
->pub
= event_recorder_return
;
958 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
959 event_recorder_return
->priv
= event_recorder_return_priv
;
960 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
961 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
963 event_recorder_return
->chan
= chan
;
964 event_recorder_return
->priv
->id
= chan
->free_event_id
++;
965 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
966 event_recorder_return
->parent
.enabled
= 0;
967 event_recorder_return
->priv
->parent
.registered
= 1;
968 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
969 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
971 * Populate lttng_event structure before kretprobe registration.
974 ret
= lttng_kretprobes_register(event_name
,
975 event_param
->u
.kretprobe
.symbol_name
,
976 event_param
->u
.kretprobe
.offset
,
977 event_param
->u
.kretprobe
.addr
,
978 event_recorder
, event_recorder_return
);
980 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
981 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
985 /* Take 2 refs on the module: one per event. */
986 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
988 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
990 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
991 event_recorder_return
);
992 WARN_ON_ONCE(ret
> 0);
994 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
995 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
996 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
997 module_put(event_recorder
->priv
->parent
.desc
->owner
);
998 goto statedump_error
;
1000 list_add(&event_recorder_return
->priv
->node
, &chan
->session
->events
);
1004 case LTTNG_KERNEL_ABI_SYSCALL
:
1006 * Needs to be explicitly enabled after creation, since
1007 * we may want to apply filters.
1009 event_recorder
->parent
.enabled
= 0;
1010 event_recorder
->priv
->parent
.registered
= 0;
1011 event_recorder
->priv
->parent
.desc
= event_desc
;
1012 switch (event_param
->u
.syscall
.entryexit
) {
1013 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1015 goto register_error
;
1016 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1017 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1019 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1020 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1023 switch (event_param
->u
.syscall
.abi
) {
1024 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1026 goto register_error
;
1027 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1028 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1030 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1031 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1034 if (!event_recorder
->priv
->parent
.desc
) {
1036 goto register_error
;
1040 case LTTNG_KERNEL_ABI_UPROBE
:
1042 * Needs to be explicitly enabled after creation, since
1043 * we may want to apply filters.
1045 event_recorder
->parent
.enabled
= 0;
1046 event_recorder
->priv
->parent
.registered
= 1;
1049 * Populate lttng_event structure before event
1054 ret
= lttng_uprobes_register_event(event_param
->name
,
1055 event_param
->u
.uprobe
.fd
,
1058 goto register_error
;
1059 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1063 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1064 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1068 goto register_error
;
1070 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event_recorder
);
1071 WARN_ON_ONCE(ret
> 0);
1073 goto statedump_error
;
1075 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1076 list_add(&event_recorder
->priv
->node
, &chan
->session
->events
);
1077 return event_recorder
;
1080 /* If a statedump error occurs, events will not be readable. */
1082 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1083 cache_private_error
:
1084 kmem_cache_free(event_recorder_cache
, event_recorder
);
1089 return ERR_PTR(ret
);
1092 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1093 const struct lttng_kernel_event_desc
*event_desc
,
1094 uint64_t token
, uint64_t error_counter_index
,
1095 struct lttng_event_notifier_group
*event_notifier_group
,
1096 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1097 enum lttng_kernel_abi_instrumentation itype
)
1099 struct lttng_kernel_event_notifier
*event_notifier
;
1100 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1101 struct lttng_counter
*error_counter
;
1102 const char *event_name
;
1103 struct hlist_head
*head
;
1107 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1108 event_name
= event_desc
->event_name
;
1111 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1112 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1113 case LTTNG_KERNEL_ABI_SYSCALL
:
1114 event_name
= event_notifier_param
->event
.name
;
1117 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1118 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1119 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1126 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1127 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1128 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1129 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1130 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1131 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1132 && event_notifier_group
== event_notifier_priv
->group
1133 && token
== event_notifier_priv
->parent
.user_token
) {
1139 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1140 if (!event_notifier
) {
1144 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1145 if (!event_notifier_priv
) {
1147 goto cache_private_error
;
1149 event_notifier_priv
->pub
= event_notifier
;
1150 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1151 event_notifier
->priv
= event_notifier_priv
;
1152 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1153 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1155 event_notifier
->priv
->group
= event_notifier_group
;
1156 event_notifier
->priv
->parent
.user_token
= token
;
1157 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1158 event_notifier
->priv
->num_captures
= 0;
1159 event_notifier
->priv
->parent
.instrumentation
= itype
;
1160 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1161 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1162 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1163 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1166 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1167 /* Event will be enabled by enabler sync. */
1168 event_notifier
->parent
.enabled
= 0;
1169 event_notifier
->priv
->parent
.registered
= 0;
1170 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1171 if (!event_notifier
->priv
->parent
.desc
) {
1173 goto register_error
;
1175 /* Populate lttng_event_notifier structure before event registration. */
1179 case LTTNG_KERNEL_ABI_KPROBE
:
1181 * Needs to be explicitly enabled after creation, since
1182 * we may want to apply filters.
1184 event_notifier
->parent
.enabled
= 0;
1185 event_notifier
->priv
->parent
.registered
= 1;
1187 * Populate lttng_event_notifier structure before event
1191 ret
= lttng_kprobes_register_event_notifier(
1192 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1193 event_notifier_param
->event
.u
.kprobe
.offset
,
1194 event_notifier_param
->event
.u
.kprobe
.addr
,
1198 goto register_error
;
1200 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1204 case LTTNG_KERNEL_ABI_SYSCALL
:
1206 * Needs to be explicitly enabled after creation, since
1207 * we may want to apply filters.
1209 event_notifier
->parent
.enabled
= 0;
1210 event_notifier
->priv
->parent
.registered
= 0;
1211 event_notifier
->priv
->parent
.desc
= event_desc
;
1212 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1213 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1215 goto register_error
;
1216 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1217 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1219 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1220 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1223 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1224 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1226 goto register_error
;
1227 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1228 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1230 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1231 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1235 if (!event_notifier
->priv
->parent
.desc
) {
1237 goto register_error
;
1241 case LTTNG_KERNEL_ABI_UPROBE
:
1243 * Needs to be explicitly enabled after creation, since
1244 * we may want to apply filters.
1246 event_notifier
->parent
.enabled
= 0;
1247 event_notifier
->priv
->parent
.registered
= 1;
1250 * Populate lttng_event_notifier structure before
1251 * event_notifier registration.
1255 ret
= lttng_uprobes_register_event_notifier(
1256 event_notifier_param
->event
.name
,
1257 event_notifier_param
->event
.u
.uprobe
.fd
,
1260 goto register_error
;
1261 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1265 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1266 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1267 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1271 goto register_error
;
1274 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1275 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1278 * Clear the error counter bucket. The sessiond keeps track of which
1279 * bucket is currently in use. We trust it. The session lock
1280 * synchronizes against concurrent creation of the error
1283 error_counter
= event_notifier_group
->error_counter
;
1284 if (error_counter
) {
1285 size_t dimension_index
[1];
1288 * Check that the index is within the boundary of the counter.
1290 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1291 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1292 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1294 goto register_error
;
1297 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1298 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1300 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1301 event_notifier
->priv
->error_counter_index
);
1302 goto register_error
;
1306 return event_notifier
;
1309 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1310 cache_private_error
:
1311 kmem_cache_free(event_notifier_cache
, event_notifier
);
1315 return ERR_PTR(ret
);
1318 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1319 const size_t *dim_indexes
, int32_t cpu
,
1320 int64_t *val
, bool *overflow
, bool *underflow
)
1322 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1323 cpu
, val
, overflow
, underflow
);
1326 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1327 const size_t *dim_indexes
, int64_t *val
,
1328 bool *overflow
, bool *underflow
)
1330 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1331 val
, overflow
, underflow
);
1334 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1335 const size_t *dim_indexes
)
1337 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1340 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_channel
*chan
,
1341 struct lttng_kernel_abi_event
*event_param
,
1342 const struct lttng_kernel_event_desc
*event_desc
,
1343 enum lttng_kernel_abi_instrumentation itype
)
1345 struct lttng_kernel_event_recorder
*event
;
1347 mutex_lock(&sessions_mutex
);
1348 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1349 mutex_unlock(&sessions_mutex
);
1353 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1354 const struct lttng_kernel_event_desc
*event_desc
,
1355 uint64_t id
, uint64_t error_counter_index
,
1356 struct lttng_event_notifier_group
*event_notifier_group
,
1357 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1358 enum lttng_kernel_abi_instrumentation itype
)
1360 struct lttng_kernel_event_notifier
*event_notifier
;
1362 mutex_lock(&sessions_mutex
);
1363 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1364 error_counter_index
, event_notifier_group
,
1365 event_notifier_param
, itype
);
1366 mutex_unlock(&sessions_mutex
);
1367 return event_notifier
;
1370 /* Only used for tracepoints for now. */
1372 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1374 const struct lttng_kernel_event_desc
*desc
;
1377 if (event_recorder
->priv
->parent
.registered
)
1380 desc
= event_recorder
->priv
->parent
.desc
;
1381 switch (event_recorder
->priv
->parent
.instrumentation
) {
1382 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1383 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1384 desc
->probe_callback
,
1388 case LTTNG_KERNEL_ABI_SYSCALL
:
1389 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1392 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1393 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1394 case LTTNG_KERNEL_ABI_KRETPROBE
:
1398 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1399 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1404 event_recorder
->priv
->parent
.registered
= 1;
1408 * Only used internally at session destruction.
1410 int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1412 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1413 const struct lttng_kernel_event_desc
*desc
;
1416 if (!event_priv
->registered
)
1419 desc
= event_priv
->desc
;
1420 switch (event_priv
->instrumentation
) {
1421 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1422 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1423 event_priv
->desc
->probe_callback
,
1427 case LTTNG_KERNEL_ABI_KPROBE
:
1428 lttng_kprobes_unregister_event(event_recorder
);
1432 case LTTNG_KERNEL_ABI_KRETPROBE
:
1433 lttng_kretprobes_unregister(event_recorder
);
1437 case LTTNG_KERNEL_ABI_SYSCALL
:
1438 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1441 case LTTNG_KERNEL_ABI_NOOP
:
1445 case LTTNG_KERNEL_ABI_UPROBE
:
1446 lttng_uprobes_unregister_event(event_recorder
);
1450 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1455 event_priv
->registered
= 0;
1459 /* Only used for tracepoints for now. */
1461 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1463 const struct lttng_kernel_event_desc
*desc
;
1466 if (event_notifier
->priv
->parent
.registered
)
1469 desc
= event_notifier
->priv
->parent
.desc
;
1470 switch (event_notifier
->priv
->parent
.instrumentation
) {
1471 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1472 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1473 desc
->probe_callback
,
1477 case LTTNG_KERNEL_ABI_SYSCALL
:
1478 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1481 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1482 case LTTNG_KERNEL_ABI_UPROBE
:
1486 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1487 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1488 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1493 event_notifier
->priv
->parent
.registered
= 1;
1497 int _lttng_event_notifier_unregister(
1498 struct lttng_kernel_event_notifier
*event_notifier
)
1500 const struct lttng_kernel_event_desc
*desc
;
1503 if (!event_notifier
->priv
->parent
.registered
)
1506 desc
= event_notifier
->priv
->parent
.desc
;
1507 switch (event_notifier
->priv
->parent
.instrumentation
) {
1508 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1509 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1510 event_notifier
->priv
->parent
.desc
->probe_callback
,
1514 case LTTNG_KERNEL_ABI_KPROBE
:
1515 lttng_kprobes_unregister_event_notifier(event_notifier
);
1519 case LTTNG_KERNEL_ABI_UPROBE
:
1520 lttng_uprobes_unregister_event_notifier(event_notifier
);
1524 case LTTNG_KERNEL_ABI_SYSCALL
:
1525 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1528 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1529 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1530 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1535 event_notifier
->priv
->parent
.registered
= 0;
1540 * Only used internally at session destruction.
1543 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1545 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1546 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1548 lttng_free_event_filter_runtime(event
);
1549 /* Free event enabler refs */
1550 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1551 &event_priv
->enablers_ref_head
, node
)
1554 switch (event
->type
) {
1555 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1557 struct lttng_kernel_event_recorder
*event_recorder
=
1558 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1560 switch (event_priv
->instrumentation
) {
1561 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1562 lttng_event_desc_put(event_priv
->desc
);
1565 case LTTNG_KERNEL_ABI_KPROBE
:
1566 module_put(event_priv
->desc
->owner
);
1567 lttng_kprobes_destroy_event_private(event_recorder
);
1570 case LTTNG_KERNEL_ABI_KRETPROBE
:
1571 module_put(event_priv
->desc
->owner
);
1572 lttng_kretprobes_destroy_private(event_recorder
);
1575 case LTTNG_KERNEL_ABI_SYSCALL
:
1578 case LTTNG_KERNEL_ABI_UPROBE
:
1579 module_put(event_priv
->desc
->owner
);
1580 lttng_uprobes_destroy_event_private(event_recorder
);
1583 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1584 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1588 list_del(&event_recorder
->priv
->node
);
1589 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1590 kmem_cache_free(event_recorder_cache
, event_recorder
);
1593 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1595 struct lttng_kernel_event_notifier
*event_notifier
=
1596 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1598 switch (event_notifier
->priv
->parent
.instrumentation
) {
1599 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1600 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1603 case LTTNG_KERNEL_ABI_KPROBE
:
1604 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1605 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1608 case LTTNG_KERNEL_ABI_SYSCALL
:
1611 case LTTNG_KERNEL_ABI_UPROBE
:
1612 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1613 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1616 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1617 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1618 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1622 list_del(&event_notifier
->priv
->node
);
1623 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1624 kmem_cache_free(event_notifier_cache
, event_notifier
);
1632 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1633 enum tracker_type tracker_type
)
1635 switch (tracker_type
) {
1637 return &session
->pid_tracker
;
1639 return &session
->vpid_tracker
;
1641 return &session
->uid_tracker
;
1643 return &session
->vuid_tracker
;
1645 return &session
->gid_tracker
;
1647 return &session
->vgid_tracker
;
1654 int lttng_session_track_id(struct lttng_session
*session
,
1655 enum tracker_type tracker_type
, int id
)
1657 struct lttng_id_tracker
*tracker
;
1660 tracker
= get_tracker(session
, tracker_type
);
1665 mutex_lock(&sessions_mutex
);
1667 /* track all ids: destroy tracker. */
1668 lttng_id_tracker_destroy(tracker
, true);
1671 ret
= lttng_id_tracker_add(tracker
, id
);
1673 mutex_unlock(&sessions_mutex
);
1677 int lttng_session_untrack_id(struct lttng_session
*session
,
1678 enum tracker_type tracker_type
, int id
)
1680 struct lttng_id_tracker
*tracker
;
1683 tracker
= get_tracker(session
, tracker_type
);
1688 mutex_lock(&sessions_mutex
);
1690 /* untrack all ids: replace by empty tracker. */
1691 ret
= lttng_id_tracker_empty_set(tracker
);
1693 ret
= lttng_id_tracker_del(tracker
, id
);
1695 mutex_unlock(&sessions_mutex
);
1700 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1702 struct lttng_id_tracker
*id_tracker
= m
->private;
1703 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1704 struct lttng_id_hash_node
*e
;
1707 mutex_lock(&sessions_mutex
);
1709 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1710 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1712 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1718 /* ID tracker disabled. */
1719 if (iter
>= *pos
&& iter
== 0) {
1720 return id_tracker_p
; /* empty tracker */
1728 /* Called with sessions_mutex held. */
1730 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1732 struct lttng_id_tracker
*id_tracker
= m
->private;
1733 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1734 struct lttng_id_hash_node
*e
;
1739 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1740 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1742 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1743 if (iter
++ >= *ppos
)
1748 /* ID tracker disabled. */
1749 if (iter
>= *ppos
&& iter
== 0)
1750 return p
; /* empty tracker */
1759 void id_list_stop(struct seq_file
*m
, void *p
)
1761 mutex_unlock(&sessions_mutex
);
1765 int id_list_show(struct seq_file
*m
, void *p
)
1767 struct lttng_id_tracker
*id_tracker
= m
->private;
1768 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1771 if (p
== id_tracker_p
) {
1772 /* Tracker disabled. */
1775 const struct lttng_id_hash_node
*e
= p
;
1777 id
= lttng_id_tracker_get_node_id(e
);
1779 switch (id_tracker
->tracker_type
) {
1781 seq_printf(m
, "process { pid = %d; };\n", id
);
1784 seq_printf(m
, "process { vpid = %d; };\n", id
);
1787 seq_printf(m
, "user { uid = %d; };\n", id
);
1790 seq_printf(m
, "user { vuid = %d; };\n", id
);
1793 seq_printf(m
, "group { gid = %d; };\n", id
);
1796 seq_printf(m
, "group { vgid = %d; };\n", id
);
1799 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1805 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1806 .start
= id_list_start
,
1807 .next
= id_list_next
,
1808 .stop
= id_list_stop
,
1809 .show
= id_list_show
,
1813 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1815 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1819 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1821 struct seq_file
*m
= file
->private_data
;
1822 struct lttng_id_tracker
*id_tracker
= m
->private;
1825 WARN_ON_ONCE(!id_tracker
);
1826 ret
= seq_release(inode
, file
);
1828 fput(id_tracker
->session
->file
);
1832 const struct file_operations lttng_tracker_ids_list_fops
= {
1833 .owner
= THIS_MODULE
,
1834 .open
= lttng_tracker_ids_list_open
,
1836 .llseek
= seq_lseek
,
1837 .release
= lttng_tracker_ids_list_release
,
1840 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1841 enum tracker_type tracker_type
)
1843 struct file
*tracker_ids_list_file
;
1847 file_fd
= lttng_get_unused_fd();
1853 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1854 <tng_tracker_ids_list_fops
,
1856 if (IS_ERR(tracker_ids_list_file
)) {
1857 ret
= PTR_ERR(tracker_ids_list_file
);
1860 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1862 goto refcount_error
;
1864 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1867 m
= tracker_ids_list_file
->private_data
;
1869 m
->private = get_tracker(session
, tracker_type
);
1870 BUG_ON(!m
->private);
1871 fd_install(file_fd
, tracker_ids_list_file
);
1876 atomic_long_dec(&session
->file
->f_count
);
1878 fput(tracker_ids_list_file
);
1880 put_unused_fd(file_fd
);
1886 * Enabler management.
1889 int lttng_match_enabler_star_glob(const char *desc_name
,
1890 const char *pattern
)
1892 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1893 desc_name
, LTTNG_SIZE_MAX
))
1899 int lttng_match_enabler_name(const char *desc_name
,
1902 if (strcmp(desc_name
, name
))
1907 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1908 struct lttng_enabler
*enabler
)
1910 const char *desc_name
, *enabler_name
;
1911 bool compat
= false, entry
= false;
1913 enabler_name
= enabler
->event_param
.name
;
1914 switch (enabler
->event_param
.instrumentation
) {
1915 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1916 desc_name
= desc
->event_name
;
1917 switch (enabler
->format_type
) {
1918 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1919 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1920 case LTTNG_ENABLER_FORMAT_NAME
:
1921 return lttng_match_enabler_name(desc_name
, enabler_name
);
1927 case LTTNG_KERNEL_ABI_SYSCALL
:
1928 desc_name
= desc
->event_name
;
1929 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1930 desc_name
+= strlen("compat_");
1933 if (!strncmp(desc_name
, "syscall_exit_",
1934 strlen("syscall_exit_"))) {
1935 desc_name
+= strlen("syscall_exit_");
1936 } else if (!strncmp(desc_name
, "syscall_entry_",
1937 strlen("syscall_entry_"))) {
1938 desc_name
+= strlen("syscall_entry_");
1944 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1945 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1947 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1951 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1958 switch (enabler
->event_param
.u
.syscall
.abi
) {
1959 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1961 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1965 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1972 switch (enabler
->event_param
.u
.syscall
.match
) {
1973 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1974 switch (enabler
->format_type
) {
1975 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1976 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1977 case LTTNG_ENABLER_FORMAT_NAME
:
1978 return lttng_match_enabler_name(desc_name
, enabler_name
);
1983 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1984 return -EINVAL
; /* Not implemented. */
1997 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1998 struct lttng_kernel_event_recorder
*event_recorder
)
2000 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2003 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2005 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2006 && event_recorder
->chan
== event_enabler
->chan
)
2013 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2014 struct lttng_kernel_event_notifier
*event_notifier
)
2016 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2017 event_notifier_enabler
);
2019 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2021 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2022 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2023 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2030 struct lttng_enabler_ref
*lttng_enabler_ref(
2031 struct list_head
*enablers_ref_list
,
2032 struct lttng_enabler
*enabler
)
2034 struct lttng_enabler_ref
*enabler_ref
;
2036 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2037 if (enabler_ref
->ref
== enabler
)
2044 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2046 struct lttng_session
*session
= event_enabler
->chan
->session
;
2047 struct lttng_kernel_probe_desc
*probe_desc
;
2048 const struct lttng_kernel_event_desc
*desc
;
2050 struct list_head
*probe_list
;
2052 probe_list
= lttng_get_probe_list_head();
2054 * For each probe event, if we find that a probe event matches
2055 * our enabler, create an associated lttng_event if not
2058 list_for_each_entry(probe_desc
, probe_list
, head
) {
2059 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2061 struct hlist_head
*head
;
2062 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2063 struct lttng_kernel_event_recorder
*event_recorder
;
2065 desc
= probe_desc
->event_desc
[i
];
2066 if (!lttng_desc_match_enabler(desc
,
2067 lttng_event_enabler_as_enabler(event_enabler
)))
2071 * Check if already created.
2073 head
= utils_borrow_hash_table_bucket(
2074 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2076 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2077 if (event_recorder_private
->parent
.desc
== desc
2078 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2085 * We need to create an event for this
2088 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2089 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2090 if (!event_recorder
) {
2091 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2092 probe_desc
->event_desc
[i
]->event_name
);
2099 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2101 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2102 struct lttng_kernel_probe_desc
*probe_desc
;
2103 const struct lttng_kernel_event_desc
*desc
;
2105 struct list_head
*probe_list
;
2107 probe_list
= lttng_get_probe_list_head();
2109 * For each probe event, if we find that a probe event matches
2110 * our enabler, create an associated lttng_event_notifier if not
2113 list_for_each_entry(probe_desc
, probe_list
, head
) {
2114 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2116 struct hlist_head
*head
;
2117 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2118 struct lttng_kernel_event_notifier
*event_notifier
;
2120 desc
= probe_desc
->event_desc
[i
];
2121 if (!lttng_desc_match_enabler(desc
,
2122 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2126 * Check if already created.
2128 head
= utils_borrow_hash_table_bucket(
2129 event_notifier_group
->event_notifiers_ht
.table
,
2130 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2131 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2132 if (event_notifier_priv
->parent
.desc
== desc
2133 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2140 * We need to create a event_notifier for this event probe.
2142 event_notifier
= _lttng_event_notifier_create(desc
,
2143 event_notifier_enabler
->base
.user_token
,
2144 event_notifier_enabler
->error_counter_index
,
2145 event_notifier_group
, NULL
,
2146 LTTNG_KERNEL_ABI_TRACEPOINT
);
2147 if (IS_ERR(event_notifier
)) {
2148 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2149 probe_desc
->event_desc
[i
]->event_name
);
2156 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2160 ret
= lttng_syscalls_register_event(event_enabler
);
2165 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2169 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2171 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2176 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2177 * tracepoint probes.
2178 * Should be called with sessions mutex held.
2181 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2183 switch (event_enabler
->base
.event_param
.instrumentation
) {
2184 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2185 lttng_create_tracepoint_event_if_missing(event_enabler
);
2188 case LTTNG_KERNEL_ABI_SYSCALL
:
2189 lttng_create_syscall_event_if_missing(event_enabler
);
2199 * Create events associated with an event_enabler (if not already present),
2200 * and add backward reference from the event to the enabler.
2201 * Should be called with sessions mutex held.
2204 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2206 struct lttng_channel
*chan
= event_enabler
->chan
;
2207 struct lttng_session
*session
= event_enabler
->chan
->session
;
2208 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2209 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2211 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2212 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2213 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2214 !strcmp(base_enabler
->event_param
.name
, "*")) {
2215 int enabled
= base_enabler
->enabled
;
2216 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2218 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2219 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2221 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2222 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2225 /* First ensure that probe events are created for this enabler. */
2226 lttng_create_event_if_missing(event_enabler
);
2228 /* For each event matching event_enabler in session event list. */
2229 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
2230 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2231 struct lttng_enabler_ref
*enabler_ref
;
2233 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2235 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2236 lttng_event_enabler_as_enabler(event_enabler
));
2239 * If no backward ref, create it.
2240 * Add backward ref from event to event_enabler.
2242 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2245 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2246 list_add(&enabler_ref
->node
,
2247 &event_recorder_priv
->parent
.enablers_ref_head
);
2251 * Link filter bytecodes if not linked yet.
2253 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2255 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2256 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2262 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2263 * tracepoint probes.
2264 * Should be called with sessions mutex held.
2267 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2269 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2270 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2271 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2274 case LTTNG_KERNEL_ABI_SYSCALL
:
2275 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2285 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2288 int lttng_event_notifier_enabler_ref_event_notifiers(
2289 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2291 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2292 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2293 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2295 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2296 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2297 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2298 !strcmp(base_enabler
->event_param
.name
, "*")) {
2300 int enabled
= base_enabler
->enabled
;
2301 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2303 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2304 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2306 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2307 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2311 /* First ensure that probe event_notifiers are created for this enabler. */
2312 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2314 /* Link the created event_notifier with its associated enabler. */
2315 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2316 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2317 struct lttng_enabler_ref
*enabler_ref
;
2319 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2322 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2323 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2326 * If no backward ref, create it.
2327 * Add backward ref from event_notifier to enabler.
2329 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2333 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2334 event_notifier_enabler
);
2335 list_add(&enabler_ref
->node
,
2336 &event_notifier_priv
->parent
.enablers_ref_head
);
2340 * Link filter bytecodes if not linked yet.
2342 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2343 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2344 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2346 /* Link capture bytecodes if not linked yet. */
2347 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2348 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2349 &event_notifier_enabler
->capture_bytecode_head
);
2351 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2357 * Called at module load: connect the probe on all enablers matching
2359 * Called with sessions lock held.
2361 int lttng_fix_pending_events(void)
2363 struct lttng_session
*session
;
2365 list_for_each_entry(session
, &sessions
, list
)
2366 lttng_session_lazy_sync_event_enablers(session
);
2370 static bool lttng_event_notifier_group_has_active_event_notifiers(
2371 struct lttng_event_notifier_group
*event_notifier_group
)
2373 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2375 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2377 if (event_notifier_enabler
->base
.enabled
)
2383 bool lttng_event_notifier_active(void)
2385 struct lttng_event_notifier_group
*event_notifier_group
;
2387 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2388 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2394 int lttng_fix_pending_event_notifiers(void)
2396 struct lttng_event_notifier_group
*event_notifier_group
;
2398 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2399 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2403 struct lttng_event_enabler
*lttng_event_enabler_create(
2404 enum lttng_enabler_format_type format_type
,
2405 struct lttng_kernel_abi_event
*event_param
,
2406 struct lttng_channel
*chan
)
2408 struct lttng_event_enabler
*event_enabler
;
2410 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2413 event_enabler
->base
.format_type
= format_type
;
2414 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2415 memcpy(&event_enabler
->base
.event_param
, event_param
,
2416 sizeof(event_enabler
->base
.event_param
));
2417 event_enabler
->chan
= chan
;
2419 event_enabler
->base
.enabled
= 0;
2420 mutex_lock(&sessions_mutex
);
2421 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2422 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2423 mutex_unlock(&sessions_mutex
);
2424 return event_enabler
;
2427 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2429 mutex_lock(&sessions_mutex
);
2430 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2431 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2432 mutex_unlock(&sessions_mutex
);
2436 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2438 mutex_lock(&sessions_mutex
);
2439 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2440 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2441 mutex_unlock(&sessions_mutex
);
2446 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2447 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2449 struct lttng_bytecode_node
*bytecode_node
;
2450 uint32_t bytecode_len
;
2453 ret
= get_user(bytecode_len
, &bytecode
->len
);
2456 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2460 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2461 sizeof(*bytecode
) + bytecode_len
);
2465 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2466 bytecode_node
->enabler
= enabler
;
2467 /* Enforce length based on allocated size */
2468 bytecode_node
->bc
.len
= bytecode_len
;
2469 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2474 lttng_kvfree(bytecode_node
);
2478 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2479 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2482 ret
= lttng_enabler_attach_filter_bytecode(
2483 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2487 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2494 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2495 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2498 switch (event
->priv
->instrumentation
) {
2499 case LTTNG_KERNEL_ABI_UPROBE
:
2500 return lttng_uprobes_event_add_callsite(event
, callsite
);
2507 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2509 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2511 /* Destroy filter bytecode */
2512 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2513 &enabler
->filter_bytecode_head
, node
) {
2514 lttng_kvfree(filter_node
);
2519 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2521 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2523 list_del(&event_enabler
->node
);
2524 kfree(event_enabler
);
2527 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2528 struct lttng_event_notifier_group
*event_notifier_group
,
2529 enum lttng_enabler_format_type format_type
,
2530 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2532 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2534 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2535 if (!event_notifier_enabler
)
2538 event_notifier_enabler
->base
.format_type
= format_type
;
2539 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2540 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2542 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2543 event_notifier_enabler
->num_captures
= 0;
2545 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2546 sizeof(event_notifier_enabler
->base
.event_param
));
2548 event_notifier_enabler
->base
.enabled
= 0;
2549 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2550 event_notifier_enabler
->group
= event_notifier_group
;
2552 mutex_lock(&sessions_mutex
);
2553 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2554 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2556 mutex_unlock(&sessions_mutex
);
2558 return event_notifier_enabler
;
2561 int lttng_event_notifier_enabler_enable(
2562 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2564 mutex_lock(&sessions_mutex
);
2565 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2566 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2567 mutex_unlock(&sessions_mutex
);
2571 int lttng_event_notifier_enabler_disable(
2572 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2574 mutex_lock(&sessions_mutex
);
2575 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2576 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2577 mutex_unlock(&sessions_mutex
);
2581 int lttng_event_notifier_enabler_attach_filter_bytecode(
2582 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2583 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2587 ret
= lttng_enabler_attach_filter_bytecode(
2588 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2593 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2600 int lttng_event_notifier_enabler_attach_capture_bytecode(
2601 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2602 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2604 struct lttng_bytecode_node
*bytecode_node
;
2605 struct lttng_enabler
*enabler
=
2606 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2607 uint32_t bytecode_len
;
2610 ret
= get_user(bytecode_len
, &bytecode
->len
);
2614 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2619 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2620 sizeof(*bytecode
) + bytecode_len
);
2624 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2625 bytecode_node
->enabler
= enabler
;
2627 /* Enforce length based on allocated size */
2628 bytecode_node
->bc
.len
= bytecode_len
;
2629 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2631 event_notifier_enabler
->num_captures
++;
2633 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2637 lttng_kvfree(bytecode_node
);
2643 void lttng_event_notifier_enabler_destroy(
2644 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2646 if (!event_notifier_enabler
) {
2650 list_del(&event_notifier_enabler
->node
);
2652 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2653 kfree(event_notifier_enabler
);
2657 * lttng_session_sync_event_enablers should be called just before starting a
2659 * Should be called with sessions mutex held.
2662 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2664 struct lttng_event_enabler
*event_enabler
;
2665 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2667 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2668 lttng_event_enabler_ref_events(event_enabler
);
2670 * For each event, if at least one of its enablers is enabled,
2671 * and its channel and session transient states are enabled, we
2672 * enable the event, else we disable it.
2674 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
2675 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2676 struct lttng_enabler_ref
*enabler_ref
;
2677 struct lttng_bytecode_runtime
*runtime
;
2678 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2681 switch (event_recorder_priv
->parent
.instrumentation
) {
2682 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2683 case LTTNG_KERNEL_ABI_SYSCALL
:
2685 list_for_each_entry(enabler_ref
,
2686 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2687 if (enabler_ref
->ref
->enabled
) {
2695 /* Not handled with lazy sync. */
2699 * Enabled state is based on union of enablers, with
2700 * intesection of session and channel transient enable
2703 enabled
= enabled
&& session
->tstate
&& event_recorder
->chan
->tstate
;
2705 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2707 * Sync tracepoint registration with event enabled
2711 register_event(event_recorder
);
2713 _lttng_event_unregister(event_recorder
);
2716 /* Check if has enablers without bytecode enabled */
2717 list_for_each_entry(enabler_ref
,
2718 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2719 if (enabler_ref
->ref
->enabled
2720 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2721 has_enablers_without_filter_bytecode
= 1;
2725 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2726 has_enablers_without_filter_bytecode
;
2728 /* Enable filters */
2729 list_for_each_entry(runtime
,
2730 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2731 lttng_bytecode_filter_sync_state(runtime
);
2734 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2735 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2740 * Apply enablers to session events, adding events to session if need
2741 * be. It is required after each modification applied to an active
2742 * session, and right before session "start".
2743 * "lazy" sync means we only sync if required.
2744 * Should be called with sessions mutex held.
2747 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2749 /* We can skip if session is not active */
2750 if (!session
->active
)
2752 lttng_session_sync_event_enablers(session
);
2756 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2758 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2759 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2761 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2762 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2765 * For each event_notifier, if at least one of its enablers is enabled,
2766 * we enable the event_notifier, else we disable it.
2768 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2769 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2770 struct lttng_enabler_ref
*enabler_ref
;
2771 struct lttng_bytecode_runtime
*runtime
;
2772 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2773 int nr_filters
= 0, nr_captures
= 0;
2775 switch (event_notifier_priv
->parent
.instrumentation
) {
2776 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2777 case LTTNG_KERNEL_ABI_SYSCALL
:
2778 /* Enable event_notifiers */
2779 list_for_each_entry(enabler_ref
,
2780 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2781 if (enabler_ref
->ref
->enabled
) {
2789 /* Not handled with sync. */
2793 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2795 * Sync tracepoint registration with event_notifier enabled
2799 if (!event_notifier_priv
->parent
.registered
)
2800 register_event_notifier(event_notifier
);
2802 if (event_notifier_priv
->parent
.registered
)
2803 _lttng_event_notifier_unregister(event_notifier
);
2806 /* Check if has enablers without bytecode enabled */
2807 list_for_each_entry(enabler_ref
,
2808 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2809 if (enabler_ref
->ref
->enabled
2810 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2811 has_enablers_without_filter_bytecode
= 1;
2815 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2816 has_enablers_without_filter_bytecode
;
2818 /* Enable filters */
2819 list_for_each_entry(runtime
,
2820 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2821 lttng_bytecode_filter_sync_state(runtime
);
2824 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2825 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2827 /* Enable captures */
2828 list_for_each_entry(runtime
,
2829 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2830 lttng_bytecode_capture_sync_state(runtime
);
2833 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2838 * Serialize at most one packet worth of metadata into a metadata
2840 * We grab the metadata cache mutex to get exclusive access to our metadata
2841 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2842 * allows us to do racy operations such as looking for remaining space left in
2843 * packet and write, since mutual exclusion protects us from concurrent writes.
2844 * Mutual exclusion on the metadata cache allow us to read the cache content
2845 * without racing against reallocation of the cache by updates.
2846 * Returns the number of bytes written in the channel, 0 if no data
2847 * was written and a negative value on error.
2849 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2850 struct channel
*chan
, bool *coherent
)
2852 struct lib_ring_buffer_ctx ctx
;
2854 size_t len
, reserve_len
;
2857 * Ensure we support mutiple get_next / put sequences followed by
2858 * put_next. The metadata cache lock protects reading the metadata
2859 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2860 * "flush" operations on the buffer invoked by different processes.
2861 * Moreover, since the metadata cache memory can be reallocated, we
2862 * need to have exclusive access against updates even though we only
2865 mutex_lock(&stream
->metadata_cache
->lock
);
2866 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2867 if (stream
->metadata_in
!= stream
->metadata_out
)
2870 /* Metadata regenerated, change the version. */
2871 if (stream
->metadata_cache
->version
!= stream
->version
)
2872 stream
->version
= stream
->metadata_cache
->version
;
2874 len
= stream
->metadata_cache
->metadata_written
-
2875 stream
->metadata_in
;
2878 reserve_len
= min_t(size_t,
2879 stream
->transport
->ops
.packet_avail_size(chan
),
2881 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2882 sizeof(char), -1, NULL
);
2884 * If reservation failed, return an error to the caller.
2886 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2888 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2889 stream
->coherent
= false;
2892 stream
->transport
->ops
.event_write(&ctx
,
2893 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2895 stream
->transport
->ops
.event_commit(&ctx
);
2896 stream
->metadata_in
+= reserve_len
;
2897 if (reserve_len
< len
)
2898 stream
->coherent
= false;
2900 stream
->coherent
= true;
2905 *coherent
= stream
->coherent
;
2906 mutex_unlock(&stream
->metadata_cache
->lock
);
2911 void lttng_metadata_begin(struct lttng_session
*session
)
2913 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2914 mutex_lock(&session
->metadata_cache
->lock
);
2918 void lttng_metadata_end(struct lttng_session
*session
)
2920 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2921 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2922 struct lttng_metadata_stream
*stream
;
2924 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2925 wake_up_interruptible(&stream
->read_wait
);
2926 mutex_unlock(&session
->metadata_cache
->lock
);
2931 * Write the metadata to the metadata cache.
2932 * Must be called with sessions_mutex held.
2933 * The metadata cache lock protects us from concurrent read access from
2934 * thread outputting metadata content to ring buffer.
2935 * The content of the printf is printed as a single atomic metadata
2938 int lttng_metadata_printf(struct lttng_session
*session
,
2939 const char *fmt
, ...)
2945 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2948 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2954 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2955 if (session
->metadata_cache
->metadata_written
+ len
>
2956 session
->metadata_cache
->cache_alloc
) {
2957 char *tmp_cache_realloc
;
2958 unsigned int tmp_cache_alloc_size
;
2960 tmp_cache_alloc_size
= max_t(unsigned int,
2961 session
->metadata_cache
->cache_alloc
+ len
,
2962 session
->metadata_cache
->cache_alloc
<< 1);
2963 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2964 if (!tmp_cache_realloc
)
2966 if (session
->metadata_cache
->data
) {
2967 memcpy(tmp_cache_realloc
,
2968 session
->metadata_cache
->data
,
2969 session
->metadata_cache
->cache_alloc
);
2970 vfree(session
->metadata_cache
->data
);
2973 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2974 session
->metadata_cache
->data
= tmp_cache_realloc
;
2976 memcpy(session
->metadata_cache
->data
+
2977 session
->metadata_cache
->metadata_written
,
2979 session
->metadata_cache
->metadata_written
+= len
;
2990 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2994 for (i
= 0; i
< nesting
; i
++) {
2997 ret
= lttng_metadata_printf(session
, " ");
3006 int lttng_field_name_statedump(struct lttng_session
*session
,
3007 const struct lttng_kernel_event_field
*field
,
3010 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3014 int _lttng_integer_type_statedump(struct lttng_session
*session
,
3015 const struct lttng_kernel_type_integer
*type
,
3016 enum lttng_kernel_string_encoding parent_encoding
,
3021 ret
= print_tabs(session
, nesting
);
3024 ret
= lttng_metadata_printf(session
,
3025 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3029 (parent_encoding
== lttng_kernel_string_encoding_none
)
3031 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3035 #if __BYTE_ORDER == __BIG_ENDIAN
3036 type
->reverse_byte_order
? " byte_order = le;" : ""
3038 type
->reverse_byte_order
? " byte_order = be;" : ""
3045 * Must be called with sessions_mutex held.
3048 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3049 const struct lttng_kernel_type_struct
*type
,
3053 uint32_t i
, nr_fields
;
3054 unsigned int alignment
;
3056 ret
= print_tabs(session
, nesting
);
3059 ret
= lttng_metadata_printf(session
,
3063 nr_fields
= type
->nr_fields
;
3064 for (i
= 0; i
< nr_fields
; i
++) {
3065 const struct lttng_kernel_event_field
*iter_field
;
3067 iter_field
= type
->fields
[i
];
3068 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3072 ret
= print_tabs(session
, nesting
);
3075 alignment
= type
->alignment
;
3077 ret
= lttng_metadata_printf(session
,
3081 ret
= lttng_metadata_printf(session
,
3088 * Must be called with sessions_mutex held.
3091 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3092 const struct lttng_kernel_event_field
*field
,
3097 ret
= _lttng_struct_type_statedump(session
,
3098 lttng_kernel_get_type_struct(field
->type
), nesting
);
3101 return lttng_field_name_statedump(session
, field
, nesting
);
3105 * Must be called with sessions_mutex held.
3108 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3109 const struct lttng_kernel_type_variant
*type
,
3113 uint32_t i
, nr_choices
;
3116 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3118 if (type
->alignment
!= 0)
3120 ret
= print_tabs(session
, nesting
);
3123 ret
= lttng_metadata_printf(session
,
3124 "variant <_%s> {\n",
3128 nr_choices
= type
->nr_choices
;
3129 for (i
= 0; i
< nr_choices
; i
++) {
3130 const struct lttng_kernel_event_field
*iter_field
;
3132 iter_field
= type
->choices
[i
];
3133 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3137 ret
= print_tabs(session
, nesting
);
3140 ret
= lttng_metadata_printf(session
,
3146 * Must be called with sessions_mutex held.
3149 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3150 const struct lttng_kernel_event_field
*field
,
3155 ret
= _lttng_variant_type_statedump(session
,
3156 lttng_kernel_get_type_variant(field
->type
), nesting
);
3159 return lttng_field_name_statedump(session
, field
, nesting
);
3163 * Must be called with sessions_mutex held.
3166 int _lttng_array_field_statedump(struct lttng_session
*session
,
3167 const struct lttng_kernel_event_field
*field
,
3171 const struct lttng_kernel_type_array
*array_type
;
3172 const struct lttng_kernel_type_common
*elem_type
;
3174 array_type
= lttng_kernel_get_type_array(field
->type
);
3175 WARN_ON_ONCE(!array_type
);
3177 if (array_type
->alignment
) {
3178 ret
= print_tabs(session
, nesting
);
3181 ret
= lttng_metadata_printf(session
,
3182 "struct { } align(%u) _%s_padding;\n",
3183 array_type
->alignment
* CHAR_BIT
,
3189 * Nested compound types: Only array of structures and variants are
3190 * currently supported.
3192 elem_type
= array_type
->elem_type
;
3193 switch (elem_type
->type
) {
3194 case lttng_kernel_type_integer
:
3195 case lttng_kernel_type_struct
:
3196 case lttng_kernel_type_variant
:
3197 ret
= _lttng_type_statedump(session
, elem_type
,
3198 array_type
->encoding
, nesting
);
3206 ret
= lttng_metadata_printf(session
,
3209 array_type
->length
);
3214 * Must be called with sessions_mutex held.
3217 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3218 const struct lttng_kernel_event_field
*field
,
3222 const char *length_name
;
3223 const struct lttng_kernel_type_sequence
*sequence_type
;
3224 const struct lttng_kernel_type_common
*elem_type
;
3226 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3227 WARN_ON_ONCE(!sequence_type
);
3229 length_name
= sequence_type
->length_name
;
3231 if (sequence_type
->alignment
) {
3232 ret
= print_tabs(session
, nesting
);
3235 ret
= lttng_metadata_printf(session
,
3236 "struct { } align(%u) _%s_padding;\n",
3237 sequence_type
->alignment
* CHAR_BIT
,
3244 * Nested compound types: Only array of structures and variants are
3245 * currently supported.
3247 elem_type
= sequence_type
->elem_type
;
3248 switch (elem_type
->type
) {
3249 case lttng_kernel_type_integer
:
3250 case lttng_kernel_type_struct
:
3251 case lttng_kernel_type_variant
:
3252 ret
= _lttng_type_statedump(session
, elem_type
,
3253 sequence_type
->encoding
, nesting
);
3261 ret
= lttng_metadata_printf(session
,
3264 sequence_type
->length_name
);
3269 * Must be called with sessions_mutex held.
3272 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3273 const struct lttng_kernel_type_enum
*type
,
3276 const struct lttng_kernel_enum_desc
*enum_desc
;
3277 const struct lttng_kernel_type_common
*container_type
;
3279 unsigned int i
, nr_entries
;
3281 container_type
= type
->container_type
;
3282 if (container_type
->type
!= lttng_kernel_type_integer
) {
3286 enum_desc
= type
->desc
;
3287 nr_entries
= enum_desc
->nr_entries
;
3289 ret
= print_tabs(session
, nesting
);
3292 ret
= lttng_metadata_printf(session
, "enum : ");
3295 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3296 lttng_kernel_string_encoding_none
, 0);
3299 ret
= lttng_metadata_printf(session
, " {\n");
3302 /* Dump all entries */
3303 for (i
= 0; i
< nr_entries
; i
++) {
3304 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3307 ret
= print_tabs(session
, nesting
+ 1);
3310 ret
= lttng_metadata_printf(session
,
3314 len
= strlen(entry
->string
);
3315 /* Escape the character '"' */
3316 for (j
= 0; j
< len
; j
++) {
3317 char c
= entry
->string
[j
];
3321 ret
= lttng_metadata_printf(session
,
3325 ret
= lttng_metadata_printf(session
,
3329 ret
= lttng_metadata_printf(session
,
3336 ret
= lttng_metadata_printf(session
, "\"");
3340 if (entry
->options
.is_auto
) {
3341 ret
= lttng_metadata_printf(session
, ",\n");
3345 ret
= lttng_metadata_printf(session
,
3349 if (entry
->start
.signedness
)
3350 ret
= lttng_metadata_printf(session
,
3351 "%lld", (long long) entry
->start
.value
);
3353 ret
= lttng_metadata_printf(session
,
3354 "%llu", entry
->start
.value
);
3357 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3359 == entry
->end
.value
) {
3360 ret
= lttng_metadata_printf(session
,
3363 if (entry
->end
.signedness
) {
3364 ret
= lttng_metadata_printf(session
,
3366 (long long) entry
->end
.value
);
3368 ret
= lttng_metadata_printf(session
,
3377 ret
= print_tabs(session
, nesting
);
3380 ret
= lttng_metadata_printf(session
, "}");
3386 * Must be called with sessions_mutex held.
3389 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3390 const struct lttng_kernel_event_field
*field
,
3394 const struct lttng_kernel_type_enum
*enum_type
;
3396 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3397 WARN_ON_ONCE(!enum_type
);
3398 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3401 return lttng_field_name_statedump(session
, field
, nesting
);
3405 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3406 const struct lttng_kernel_event_field
*field
,
3411 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3412 lttng_kernel_string_encoding_none
, nesting
);
3415 return lttng_field_name_statedump(session
, field
, nesting
);
3419 int _lttng_string_type_statedump(struct lttng_session
*session
,
3420 const struct lttng_kernel_type_string
*type
,
3425 /* Default encoding is UTF8 */
3426 ret
= print_tabs(session
, nesting
);
3429 ret
= lttng_metadata_printf(session
,
3431 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3432 " { encoding = ASCII; }" : "");
3437 int _lttng_string_field_statedump(struct lttng_session
*session
,
3438 const struct lttng_kernel_event_field
*field
,
3441 const struct lttng_kernel_type_string
*string_type
;
3444 string_type
= lttng_kernel_get_type_string(field
->type
);
3445 WARN_ON_ONCE(!string_type
);
3446 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3449 return lttng_field_name_statedump(session
, field
, nesting
);
3453 * Must be called with sessions_mutex held.
3456 int _lttng_type_statedump(struct lttng_session
*session
,
3457 const struct lttng_kernel_type_common
*type
,
3458 enum lttng_kernel_string_encoding parent_encoding
,
3463 switch (type
->type
) {
3464 case lttng_kernel_type_integer
:
3465 ret
= _lttng_integer_type_statedump(session
,
3466 lttng_kernel_get_type_integer(type
),
3467 parent_encoding
, nesting
);
3469 case lttng_kernel_type_enum
:
3470 ret
= _lttng_enum_type_statedump(session
,
3471 lttng_kernel_get_type_enum(type
),
3474 case lttng_kernel_type_string
:
3475 ret
= _lttng_string_type_statedump(session
,
3476 lttng_kernel_get_type_string(type
),
3479 case lttng_kernel_type_struct
:
3480 ret
= _lttng_struct_type_statedump(session
,
3481 lttng_kernel_get_type_struct(type
),
3484 case lttng_kernel_type_variant
:
3485 ret
= _lttng_variant_type_statedump(session
,
3486 lttng_kernel_get_type_variant(type
),
3490 /* Nested arrays and sequences are not supported yet. */
3491 case lttng_kernel_type_array
:
3492 case lttng_kernel_type_sequence
:
3501 * Must be called with sessions_mutex held.
3504 int _lttng_field_statedump(struct lttng_session
*session
,
3505 const struct lttng_kernel_event_field
*field
,
3510 switch (field
->type
->type
) {
3511 case lttng_kernel_type_integer
:
3512 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3514 case lttng_kernel_type_enum
:
3515 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3517 case lttng_kernel_type_string
:
3518 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3520 case lttng_kernel_type_struct
:
3521 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3523 case lttng_kernel_type_array
:
3524 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3526 case lttng_kernel_type_sequence
:
3527 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3529 case lttng_kernel_type_variant
:
3530 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3541 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3542 struct lttng_kernel_ctx
*ctx
)
3549 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3550 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3552 ret
= _lttng_field_statedump(session
, field
->event_field
, 2);
3560 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3561 struct lttng_kernel_event_recorder
*event_recorder
)
3563 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3567 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3568 const struct lttng_kernel_event_field
*field
= desc
->fields
[i
];
3570 ret
= _lttng_field_statedump(session
, field
, 2);
3578 * Must be called with sessions_mutex held.
3579 * The entire event metadata is printed as a single atomic metadata
3583 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3584 struct lttng_channel
*chan
,
3585 struct lttng_kernel_event_recorder
*event_recorder
)
3589 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3591 if (chan
->channel_type
== METADATA_CHANNEL
)
3594 lttng_metadata_begin(session
);
3596 ret
= lttng_metadata_printf(session
,
3600 " stream_id = %u;\n",
3601 event_recorder
->priv
->parent
.desc
->event_name
,
3602 event_recorder
->priv
->id
,
3603 event_recorder
->chan
->id
);
3607 ret
= lttng_metadata_printf(session
,
3608 " fields := struct {\n"
3613 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3618 * LTTng space reservation can only reserve multiples of the
3621 ret
= lttng_metadata_printf(session
,
3627 event_recorder
->priv
->metadata_dumped
= 1;
3629 lttng_metadata_end(session
);
3635 * Must be called with sessions_mutex held.
3636 * The entire channel metadata is printed as a single atomic metadata
3640 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3641 struct lttng_channel
*chan
)
3645 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3648 if (chan
->channel_type
== METADATA_CHANNEL
)
3651 lttng_metadata_begin(session
);
3653 WARN_ON_ONCE(!chan
->header_type
);
3654 ret
= lttng_metadata_printf(session
,
3657 " event.header := %s;\n"
3658 " packet.context := struct packet_context;\n",
3660 chan
->header_type
== 1 ? "struct event_header_compact" :
3661 "struct event_header_large");
3666 ret
= lttng_metadata_printf(session
,
3667 " event.context := struct {\n");
3671 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3675 ret
= lttng_metadata_printf(session
,
3681 ret
= lttng_metadata_printf(session
,
3684 chan
->metadata_dumped
= 1;
3686 lttng_metadata_end(session
);
3691 * Must be called with sessions_mutex held.
3694 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3696 return lttng_metadata_printf(session
,
3697 "struct packet_context {\n"
3698 " uint64_clock_monotonic_t timestamp_begin;\n"
3699 " uint64_clock_monotonic_t timestamp_end;\n"
3700 " uint64_t content_size;\n"
3701 " uint64_t packet_size;\n"
3702 " uint64_t packet_seq_num;\n"
3703 " unsigned long events_discarded;\n"
3704 " uint32_t cpu_id;\n"
3711 * id: range: 0 - 30.
3712 * id 31 is reserved to indicate an extended header.
3715 * id: range: 0 - 65534.
3716 * id 65535 is reserved to indicate an extended header.
3718 * Must be called with sessions_mutex held.
3721 int _lttng_event_header_declare(struct lttng_session
*session
)
3723 return lttng_metadata_printf(session
,
3724 "struct event_header_compact {\n"
3725 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3728 " uint27_clock_monotonic_t timestamp;\n"
3732 " uint64_clock_monotonic_t timestamp;\n"
3737 "struct event_header_large {\n"
3738 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3741 " uint32_clock_monotonic_t timestamp;\n"
3745 " uint64_clock_monotonic_t timestamp;\n"
3749 lttng_alignof(uint32_t) * CHAR_BIT
,
3750 lttng_alignof(uint16_t) * CHAR_BIT
3755 * Approximation of NTP time of day to clock monotonic correlation,
3756 * taken at start of trace.
3757 * Yes, this is only an approximation. Yes, we can (and will) do better
3758 * in future versions.
3759 * This function may return a negative offset. It may happen if the
3760 * system sets the REALTIME clock to 0 after boot.
3762 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3766 int64_t measure_clock_offset(void)
3768 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3769 uint64_t tcf
= trace_clock_freq();
3771 unsigned long flags
;
3772 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3773 struct timespec64 rts
= { 0, 0 };
3775 struct timespec rts
= { 0, 0 };
3778 /* Disable interrupts to increase correlation precision. */
3779 local_irq_save(flags
);
3780 monotonic
[0] = trace_clock_read64();
3781 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3782 ktime_get_real_ts64(&rts
);
3784 getnstimeofday(&rts
);
3786 monotonic
[1] = trace_clock_read64();
3787 local_irq_restore(flags
);
3789 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3790 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3791 if (tcf
== NSEC_PER_SEC
) {
3792 realtime
+= rts
.tv_nsec
;
3794 uint64_t n
= rts
.tv_nsec
* tcf
;
3796 do_div(n
, NSEC_PER_SEC
);
3799 offset
= (int64_t) realtime
- monotonic_avg
;
3804 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3812 while (cur
!= '\0') {
3815 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3819 ret
= lttng_metadata_printf(session
, "%c", '\\');
3822 /* We still print the current char */
3825 ret
= lttng_metadata_printf(session
, "%c", cur
);
3839 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3840 const char *field_value
)
3844 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3848 ret
= print_escaped_ctf_string(session
, field_value
);
3852 ret
= lttng_metadata_printf(session
, "\";\n");
3859 * Output metadata into this session's metadata buffers.
3860 * Must be called with sessions_mutex held.
3863 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3865 unsigned char *uuid_c
= session
->uuid
.b
;
3866 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3867 const char *product_uuid
;
3868 struct lttng_channel
*chan
;
3869 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3872 if (!LTTNG_READ_ONCE(session
->active
))
3875 lttng_metadata_begin(session
);
3877 if (session
->metadata_dumped
)
3880 snprintf(uuid_s
, sizeof(uuid_s
),
3881 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3882 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3883 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3884 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3885 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3887 ret
= lttng_metadata_printf(session
,
3888 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3889 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3890 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3891 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3892 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3893 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3894 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3900 " byte_order = %s;\n"
3901 " packet.header := struct {\n"
3902 " uint32_t magic;\n"
3903 " uint8_t uuid[16];\n"
3904 " uint32_t stream_id;\n"
3905 " uint64_t stream_instance_id;\n"
3908 lttng_alignof(uint8_t) * CHAR_BIT
,
3909 lttng_alignof(uint16_t) * CHAR_BIT
,
3910 lttng_alignof(uint32_t) * CHAR_BIT
,
3911 lttng_alignof(uint64_t) * CHAR_BIT
,
3912 sizeof(unsigned long) * CHAR_BIT
,
3913 lttng_alignof(unsigned long) * CHAR_BIT
,
3917 #if __BYTE_ORDER == __BIG_ENDIAN
3926 ret
= lttng_metadata_printf(session
,
3928 " hostname = \"%s\";\n"
3929 " domain = \"kernel\";\n"
3930 " sysname = \"%s\";\n"
3931 " kernel_release = \"%s\";\n"
3932 " kernel_version = \"%s\";\n"
3933 " tracer_name = \"lttng-modules\";\n"
3934 " tracer_major = %d;\n"
3935 " tracer_minor = %d;\n"
3936 " tracer_patchlevel = %d;\n"
3937 " trace_buffering_scheme = \"global\";\n",
3938 current
->nsproxy
->uts_ns
->name
.nodename
,
3942 LTTNG_MODULES_MAJOR_VERSION
,
3943 LTTNG_MODULES_MINOR_VERSION
,
3944 LTTNG_MODULES_PATCHLEVEL_VERSION
3949 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3952 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3953 session
->creation_time
);
3957 /* Add the product UUID to the 'env' section */
3958 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3960 ret
= lttng_metadata_printf(session
,
3961 " product_uuid = \"%s\";\n",
3968 /* Close the 'env' section */
3969 ret
= lttng_metadata_printf(session
, "};\n\n");
3973 ret
= lttng_metadata_printf(session
,
3975 " name = \"%s\";\n",
3981 if (!trace_clock_uuid(clock_uuid_s
)) {
3982 ret
= lttng_metadata_printf(session
,
3983 " uuid = \"%s\";\n",
3990 ret
= lttng_metadata_printf(session
,
3991 " description = \"%s\";\n"
3992 " freq = %llu; /* Frequency, in Hz */\n"
3993 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3996 trace_clock_description(),
3997 (unsigned long long) trace_clock_freq(),
3998 (long long) measure_clock_offset()
4003 ret
= lttng_metadata_printf(session
,
4004 "typealias integer {\n"
4005 " size = 27; align = 1; signed = false;\n"
4006 " map = clock.%s.value;\n"
4007 "} := uint27_clock_monotonic_t;\n"
4009 "typealias integer {\n"
4010 " size = 32; align = %u; signed = false;\n"
4011 " map = clock.%s.value;\n"
4012 "} := uint32_clock_monotonic_t;\n"
4014 "typealias integer {\n"
4015 " size = 64; align = %u; signed = false;\n"
4016 " map = clock.%s.value;\n"
4017 "} := uint64_clock_monotonic_t;\n\n",
4019 lttng_alignof(uint32_t) * CHAR_BIT
,
4021 lttng_alignof(uint64_t) * CHAR_BIT
,
4027 ret
= _lttng_stream_packet_context_declare(session
);
4031 ret
= _lttng_event_header_declare(session
);
4036 list_for_each_entry(chan
, &session
->chan
, list
) {
4037 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4042 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
4043 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4044 event_recorder_priv
->pub
);
4048 session
->metadata_dumped
= 1;
4050 lttng_metadata_end(session
);
4055 * lttng_transport_register - LTT transport registration
4056 * @transport: transport structure
4058 * Registers a transport which can be used as output to extract the data out of
4059 * LTTng. The module calling this registration function must ensure that no
4060 * trap-inducing code will be executed by the transport functions. E.g.
4061 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4062 * is made visible to the transport function. This registration acts as a
4063 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4064 * after its registration must it synchronize the TLBs.
4066 void lttng_transport_register(struct lttng_transport
*transport
)
4069 * Make sure no page fault can be triggered by the module about to be
4070 * registered. We deal with this here so we don't have to call
4071 * vmalloc_sync_mappings() in each module's init.
4073 wrapper_vmalloc_sync_mappings();
4075 mutex_lock(&sessions_mutex
);
4076 list_add_tail(&transport
->node
, <tng_transport_list
);
4077 mutex_unlock(&sessions_mutex
);
4079 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4082 * lttng_transport_unregister - LTT transport unregistration
4083 * @transport: transport structure
4085 void lttng_transport_unregister(struct lttng_transport
*transport
)
4087 mutex_lock(&sessions_mutex
);
4088 list_del(&transport
->node
);
4089 mutex_unlock(&sessions_mutex
);
4091 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4093 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4096 * Make sure no page fault can be triggered by the module about to be
4097 * registered. We deal with this here so we don't have to call
4098 * vmalloc_sync_mappings() in each module's init.
4100 wrapper_vmalloc_sync_mappings();
4102 mutex_lock(&sessions_mutex
);
4103 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4104 mutex_unlock(&sessions_mutex
);
4106 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4108 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4110 mutex_lock(&sessions_mutex
);
4111 list_del(&transport
->node
);
4112 mutex_unlock(&sessions_mutex
);
4114 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4116 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4118 enum cpuhp_state lttng_hp_prepare
;
4119 enum cpuhp_state lttng_hp_online
;
4121 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4123 struct lttng_cpuhp_node
*lttng_node
;
4125 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4126 switch (lttng_node
->component
) {
4127 case LTTNG_RING_BUFFER_FRONTEND
:
4129 case LTTNG_RING_BUFFER_BACKEND
:
4130 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4131 case LTTNG_RING_BUFFER_ITER
:
4133 case LTTNG_CONTEXT_PERF_COUNTERS
:
4140 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4142 struct lttng_cpuhp_node
*lttng_node
;
4144 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4145 switch (lttng_node
->component
) {
4146 case LTTNG_RING_BUFFER_FRONTEND
:
4147 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4148 case LTTNG_RING_BUFFER_BACKEND
:
4150 case LTTNG_RING_BUFFER_ITER
:
4152 case LTTNG_CONTEXT_PERF_COUNTERS
:
4153 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4159 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4161 struct lttng_cpuhp_node
*lttng_node
;
4163 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4164 switch (lttng_node
->component
) {
4165 case LTTNG_RING_BUFFER_FRONTEND
:
4166 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4167 case LTTNG_RING_BUFFER_BACKEND
:
4169 case LTTNG_RING_BUFFER_ITER
:
4170 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4171 case LTTNG_CONTEXT_PERF_COUNTERS
:
4172 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4178 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4180 struct lttng_cpuhp_node
*lttng_node
;
4182 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4183 switch (lttng_node
->component
) {
4184 case LTTNG_RING_BUFFER_FRONTEND
:
4185 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4186 case LTTNG_RING_BUFFER_BACKEND
:
4188 case LTTNG_RING_BUFFER_ITER
:
4190 case LTTNG_CONTEXT_PERF_COUNTERS
:
4197 static int __init
lttng_init_cpu_hotplug(void)
4201 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4202 lttng_hotplug_prepare
,
4203 lttng_hotplug_dead
);
4207 lttng_hp_prepare
= ret
;
4208 lttng_rb_set_hp_prepare(ret
);
4210 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4211 lttng_hotplug_online
,
4212 lttng_hotplug_offline
);
4214 cpuhp_remove_multi_state(lttng_hp_prepare
);
4215 lttng_hp_prepare
= 0;
4218 lttng_hp_online
= ret
;
4219 lttng_rb_set_hp_online(ret
);
4224 static void __exit
lttng_exit_cpu_hotplug(void)
4226 lttng_rb_set_hp_online(0);
4227 cpuhp_remove_multi_state(lttng_hp_online
);
4228 lttng_rb_set_hp_prepare(0);
4229 cpuhp_remove_multi_state(lttng_hp_prepare
);
4232 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4233 static int lttng_init_cpu_hotplug(void)
4237 static void lttng_exit_cpu_hotplug(void)
4240 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4243 static int __init
lttng_events_init(void)
4247 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4250 ret
= wrapper_get_pfnblock_flags_mask_init();
4253 ret
= wrapper_get_pageblock_flags_mask_init();
4256 ret
= lttng_probes_init();
4259 ret
= lttng_context_init();
4262 ret
= lttng_tracepoint_init();
4265 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4266 if (!event_recorder_cache
) {
4268 goto error_kmem_event_recorder
;
4270 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4271 if (!event_recorder_private_cache
) {
4273 goto error_kmem_event_recorder_private
;
4275 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4276 if (!event_notifier_cache
) {
4278 goto error_kmem_event_notifier
;
4280 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4281 if (!event_notifier_private_cache
) {
4283 goto error_kmem_event_notifier_private
;
4285 ret
= lttng_abi_init();
4288 ret
= lttng_logger_init();
4291 ret
= lttng_init_cpu_hotplug();
4294 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4295 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4296 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4297 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4298 LTTNG_MODULES_EXTRAVERSION
,
4300 #ifdef LTTNG_EXTRA_VERSION_GIT
4301 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4305 #ifdef LTTNG_EXTRA_VERSION_NAME
4306 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4313 lttng_logger_exit();
4317 kmem_cache_destroy(event_notifier_private_cache
);
4318 error_kmem_event_notifier_private
:
4319 kmem_cache_destroy(event_notifier_cache
);
4320 error_kmem_event_notifier
:
4321 kmem_cache_destroy(event_recorder_private_cache
);
4322 error_kmem_event_recorder_private
:
4323 kmem_cache_destroy(event_recorder_cache
);
4324 error_kmem_event_recorder
:
4325 lttng_tracepoint_exit();
4327 lttng_context_exit();
4328 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4329 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4330 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4331 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4332 LTTNG_MODULES_EXTRAVERSION
,
4334 #ifdef LTTNG_EXTRA_VERSION_GIT
4335 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4339 #ifdef LTTNG_EXTRA_VERSION_NAME
4340 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4347 module_init(lttng_events_init
);
4349 static void __exit
lttng_events_exit(void)
4351 struct lttng_session
*session
, *tmpsession
;
4353 lttng_exit_cpu_hotplug();
4354 lttng_logger_exit();
4356 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4357 lttng_session_destroy(session
);
4358 kmem_cache_destroy(event_recorder_cache
);
4359 kmem_cache_destroy(event_recorder_private_cache
);
4360 kmem_cache_destroy(event_notifier_cache
);
4361 kmem_cache_destroy(event_notifier_private_cache
);
4362 lttng_tracepoint_exit();
4363 lttng_context_exit();
4364 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4365 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4366 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4367 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4368 LTTNG_MODULES_EXTRAVERSION
,
4370 #ifdef LTTNG_EXTRA_VERSION_GIT
4371 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4375 #ifdef LTTNG_EXTRA_VERSION_NAME
4376 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4382 module_exit(lttng_events_exit
);
4384 #include <generated/patches.h>
4385 #ifdef LTTNG_EXTRA_VERSION_GIT
4386 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4388 #ifdef LTTNG_EXTRA_VERSION_NAME
4389 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4391 MODULE_LICENSE("GPL and additional rights");
4392 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4393 MODULE_DESCRIPTION("LTTng tracer");
4394 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4395 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4396 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4397 LTTNG_MODULES_EXTRAVERSION
);