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
,
92 size_t nesting
, const char **prev_field_name_p
);
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
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
889 event_recorder
->chan
= chan
;
890 event_recorder
->priv
->id
= chan
->free_event_id
++;
891 event_recorder
->priv
->parent
.instrumentation
= itype
;
892 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
893 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
896 case LTTNG_KERNEL_ABI_TRACEPOINT
:
897 /* Event will be enabled by enabler sync. */
898 event_recorder
->parent
.enabled
= 0;
899 event_recorder
->priv
->parent
.registered
= 0;
900 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
901 if (!event_recorder
->priv
->parent
.desc
) {
905 /* Populate lttng_event structure before event registration. */
909 case LTTNG_KERNEL_ABI_KPROBE
:
911 * Needs to be explicitly enabled after creation, since
912 * we may want to apply filters.
914 event_recorder
->parent
.enabled
= 0;
915 event_recorder
->priv
->parent
.registered
= 1;
917 * Populate lttng_event structure before event
921 ret
= lttng_kprobes_register_event(event_name
,
922 event_param
->u
.kprobe
.symbol_name
,
923 event_param
->u
.kprobe
.offset
,
924 event_param
->u
.kprobe
.addr
,
930 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
934 case LTTNG_KERNEL_ABI_KRETPROBE
:
936 struct lttng_kernel_event_recorder
*event_recorder_return
;
937 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
939 /* kretprobe defines 2 events */
941 * Needs to be explicitly enabled after creation, since
942 * we may want to apply filters.
944 event_recorder
->parent
.enabled
= 0;
945 event_recorder
->priv
->parent
.registered
= 1;
947 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
948 if (!event_recorder_return
) {
952 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
953 if (!event_recorder_return_priv
) {
954 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
958 event_recorder_return_priv
->pub
= event_recorder_return
;
959 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
960 event_recorder_return
->priv
= event_recorder_return_priv
;
961 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
962 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
964 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
965 event_recorder_return
->chan
= chan
;
966 event_recorder_return
->priv
->id
= chan
->free_event_id
++;
967 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
968 event_recorder_return
->parent
.enabled
= 0;
969 event_recorder_return
->priv
->parent
.registered
= 1;
970 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
971 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
973 * Populate lttng_event structure before kretprobe registration.
976 ret
= lttng_kretprobes_register(event_name
,
977 event_param
->u
.kretprobe
.symbol_name
,
978 event_param
->u
.kretprobe
.offset
,
979 event_param
->u
.kretprobe
.addr
,
980 event_recorder
, event_recorder_return
);
982 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
983 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
987 /* Take 2 refs on the module: one per event. */
988 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
990 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
992 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
993 event_recorder_return
);
994 WARN_ON_ONCE(ret
> 0);
996 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
997 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
998 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
999 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1000 goto statedump_error
;
1002 list_add(&event_recorder_return
->priv
->node
, &chan
->session
->events
);
1006 case LTTNG_KERNEL_ABI_SYSCALL
:
1008 * Needs to be explicitly enabled after creation, since
1009 * we may want to apply filters.
1011 event_recorder
->parent
.enabled
= 0;
1012 event_recorder
->priv
->parent
.registered
= 0;
1013 event_recorder
->priv
->parent
.desc
= event_desc
;
1014 switch (event_param
->u
.syscall
.entryexit
) {
1015 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1017 goto register_error
;
1018 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1019 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1021 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1022 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1025 switch (event_param
->u
.syscall
.abi
) {
1026 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1028 goto register_error
;
1029 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1030 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1032 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1033 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1036 if (!event_recorder
->priv
->parent
.desc
) {
1038 goto register_error
;
1042 case LTTNG_KERNEL_ABI_UPROBE
:
1044 * Needs to be explicitly enabled after creation, since
1045 * we may want to apply filters.
1047 event_recorder
->parent
.enabled
= 0;
1048 event_recorder
->priv
->parent
.registered
= 1;
1051 * Populate lttng_event structure before event
1056 ret
= lttng_uprobes_register_event(event_param
->name
,
1057 event_param
->u
.uprobe
.fd
,
1060 goto register_error
;
1061 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1065 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1066 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1070 goto register_error
;
1072 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event_recorder
);
1073 WARN_ON_ONCE(ret
> 0);
1075 goto statedump_error
;
1077 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1078 list_add(&event_recorder
->priv
->node
, &chan
->session
->events
);
1079 return event_recorder
;
1082 /* If a statedump error occurs, events will not be readable. */
1084 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1085 cache_private_error
:
1086 kmem_cache_free(event_recorder_cache
, event_recorder
);
1091 return ERR_PTR(ret
);
1094 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1095 const struct lttng_kernel_event_desc
*event_desc
,
1096 uint64_t token
, uint64_t error_counter_index
,
1097 struct lttng_event_notifier_group
*event_notifier_group
,
1098 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1099 enum lttng_kernel_abi_instrumentation itype
)
1101 struct lttng_kernel_event_notifier
*event_notifier
;
1102 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1103 struct lttng_counter
*error_counter
;
1104 const char *event_name
;
1105 struct hlist_head
*head
;
1109 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1110 event_name
= event_desc
->event_name
;
1113 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1114 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1115 case LTTNG_KERNEL_ABI_SYSCALL
:
1116 event_name
= event_notifier_param
->event
.name
;
1119 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1120 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1121 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1128 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1129 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1130 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1131 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1132 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1133 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1134 && event_notifier_group
== event_notifier_priv
->group
1135 && token
== event_notifier_priv
->parent
.user_token
) {
1141 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1142 if (!event_notifier
) {
1146 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1147 if (!event_notifier_priv
) {
1149 goto cache_private_error
;
1151 event_notifier_priv
->pub
= event_notifier
;
1152 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1153 event_notifier
->priv
= event_notifier_priv
;
1154 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1155 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1157 event_notifier
->priv
->group
= event_notifier_group
;
1158 event_notifier
->priv
->parent
.user_token
= token
;
1159 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1160 event_notifier
->priv
->num_captures
= 0;
1161 event_notifier
->priv
->parent
.instrumentation
= itype
;
1162 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1163 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1164 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1165 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1166 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1169 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1170 /* Event will be enabled by enabler sync. */
1171 event_notifier
->parent
.enabled
= 0;
1172 event_notifier
->priv
->parent
.registered
= 0;
1173 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1174 if (!event_notifier
->priv
->parent
.desc
) {
1176 goto register_error
;
1178 /* Populate lttng_event_notifier structure before event registration. */
1182 case LTTNG_KERNEL_ABI_KPROBE
:
1184 * Needs to be explicitly enabled after creation, since
1185 * we may want to apply filters.
1187 event_notifier
->parent
.enabled
= 0;
1188 event_notifier
->priv
->parent
.registered
= 1;
1190 * Populate lttng_event_notifier structure before event
1194 ret
= lttng_kprobes_register_event_notifier(
1195 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1196 event_notifier_param
->event
.u
.kprobe
.offset
,
1197 event_notifier_param
->event
.u
.kprobe
.addr
,
1201 goto register_error
;
1203 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1207 case LTTNG_KERNEL_ABI_SYSCALL
:
1209 * Needs to be explicitly enabled after creation, since
1210 * we may want to apply filters.
1212 event_notifier
->parent
.enabled
= 0;
1213 event_notifier
->priv
->parent
.registered
= 0;
1214 event_notifier
->priv
->parent
.desc
= event_desc
;
1215 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1216 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1218 goto register_error
;
1219 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1220 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1222 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1223 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1226 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1227 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1229 goto register_error
;
1230 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1231 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1233 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1234 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1238 if (!event_notifier
->priv
->parent
.desc
) {
1240 goto register_error
;
1244 case LTTNG_KERNEL_ABI_UPROBE
:
1246 * Needs to be explicitly enabled after creation, since
1247 * we may want to apply filters.
1249 event_notifier
->parent
.enabled
= 0;
1250 event_notifier
->priv
->parent
.registered
= 1;
1253 * Populate lttng_event_notifier structure before
1254 * event_notifier registration.
1258 ret
= lttng_uprobes_register_event_notifier(
1259 event_notifier_param
->event
.name
,
1260 event_notifier_param
->event
.u
.uprobe
.fd
,
1263 goto register_error
;
1264 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1268 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1269 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1270 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1274 goto register_error
;
1277 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1278 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1281 * Clear the error counter bucket. The sessiond keeps track of which
1282 * bucket is currently in use. We trust it. The session lock
1283 * synchronizes against concurrent creation of the error
1286 error_counter
= event_notifier_group
->error_counter
;
1287 if (error_counter
) {
1288 size_t dimension_index
[1];
1291 * Check that the index is within the boundary of the counter.
1293 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1294 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1295 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1297 goto register_error
;
1300 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1301 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1303 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1304 event_notifier
->priv
->error_counter_index
);
1305 goto register_error
;
1309 return event_notifier
;
1312 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1313 cache_private_error
:
1314 kmem_cache_free(event_notifier_cache
, event_notifier
);
1318 return ERR_PTR(ret
);
1321 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1322 const size_t *dim_indexes
, int32_t cpu
,
1323 int64_t *val
, bool *overflow
, bool *underflow
)
1325 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1326 cpu
, val
, overflow
, underflow
);
1329 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1330 const size_t *dim_indexes
, int64_t *val
,
1331 bool *overflow
, bool *underflow
)
1333 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1334 val
, overflow
, underflow
);
1337 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1338 const size_t *dim_indexes
)
1340 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1343 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_channel
*chan
,
1344 struct lttng_kernel_abi_event
*event_param
,
1345 const struct lttng_kernel_event_desc
*event_desc
,
1346 enum lttng_kernel_abi_instrumentation itype
)
1348 struct lttng_kernel_event_recorder
*event
;
1350 mutex_lock(&sessions_mutex
);
1351 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1352 mutex_unlock(&sessions_mutex
);
1356 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1357 const struct lttng_kernel_event_desc
*event_desc
,
1358 uint64_t id
, uint64_t error_counter_index
,
1359 struct lttng_event_notifier_group
*event_notifier_group
,
1360 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1361 enum lttng_kernel_abi_instrumentation itype
)
1363 struct lttng_kernel_event_notifier
*event_notifier
;
1365 mutex_lock(&sessions_mutex
);
1366 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1367 error_counter_index
, event_notifier_group
,
1368 event_notifier_param
, itype
);
1369 mutex_unlock(&sessions_mutex
);
1370 return event_notifier
;
1373 /* Only used for tracepoints for now. */
1375 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1377 const struct lttng_kernel_event_desc
*desc
;
1380 if (event_recorder
->priv
->parent
.registered
)
1383 desc
= event_recorder
->priv
->parent
.desc
;
1384 switch (event_recorder
->priv
->parent
.instrumentation
) {
1385 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1386 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1387 desc
->probe_callback
,
1391 case LTTNG_KERNEL_ABI_SYSCALL
:
1392 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1395 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1396 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1397 case LTTNG_KERNEL_ABI_KRETPROBE
:
1401 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1402 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1407 event_recorder
->priv
->parent
.registered
= 1;
1411 * Only used internally at session destruction.
1413 int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1415 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1416 const struct lttng_kernel_event_desc
*desc
;
1419 if (!event_priv
->registered
)
1422 desc
= event_priv
->desc
;
1423 switch (event_priv
->instrumentation
) {
1424 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1425 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1426 event_priv
->desc
->probe_callback
,
1430 case LTTNG_KERNEL_ABI_KPROBE
:
1431 lttng_kprobes_unregister_event(event_recorder
);
1435 case LTTNG_KERNEL_ABI_KRETPROBE
:
1436 lttng_kretprobes_unregister(event_recorder
);
1440 case LTTNG_KERNEL_ABI_SYSCALL
:
1441 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1444 case LTTNG_KERNEL_ABI_NOOP
:
1448 case LTTNG_KERNEL_ABI_UPROBE
:
1449 lttng_uprobes_unregister_event(event_recorder
);
1453 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1458 event_priv
->registered
= 0;
1462 /* Only used for tracepoints for now. */
1464 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1466 const struct lttng_kernel_event_desc
*desc
;
1469 if (event_notifier
->priv
->parent
.registered
)
1472 desc
= event_notifier
->priv
->parent
.desc
;
1473 switch (event_notifier
->priv
->parent
.instrumentation
) {
1474 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1475 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1476 desc
->probe_callback
,
1480 case LTTNG_KERNEL_ABI_SYSCALL
:
1481 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1484 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1485 case LTTNG_KERNEL_ABI_UPROBE
:
1489 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1490 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1491 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1496 event_notifier
->priv
->parent
.registered
= 1;
1500 int _lttng_event_notifier_unregister(
1501 struct lttng_kernel_event_notifier
*event_notifier
)
1503 const struct lttng_kernel_event_desc
*desc
;
1506 if (!event_notifier
->priv
->parent
.registered
)
1509 desc
= event_notifier
->priv
->parent
.desc
;
1510 switch (event_notifier
->priv
->parent
.instrumentation
) {
1511 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1512 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1513 event_notifier
->priv
->parent
.desc
->probe_callback
,
1517 case LTTNG_KERNEL_ABI_KPROBE
:
1518 lttng_kprobes_unregister_event_notifier(event_notifier
);
1522 case LTTNG_KERNEL_ABI_UPROBE
:
1523 lttng_uprobes_unregister_event_notifier(event_notifier
);
1527 case LTTNG_KERNEL_ABI_SYSCALL
:
1528 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1531 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1532 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1533 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1538 event_notifier
->priv
->parent
.registered
= 0;
1543 * Only used internally at session destruction.
1546 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1548 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1549 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1551 lttng_free_event_filter_runtime(event
);
1552 /* Free event enabler refs */
1553 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1554 &event_priv
->enablers_ref_head
, node
)
1557 switch (event
->type
) {
1558 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1560 struct lttng_kernel_event_recorder
*event_recorder
=
1561 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1563 switch (event_priv
->instrumentation
) {
1564 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1565 lttng_event_desc_put(event_priv
->desc
);
1568 case LTTNG_KERNEL_ABI_KPROBE
:
1569 module_put(event_priv
->desc
->owner
);
1570 lttng_kprobes_destroy_event_private(event_recorder
);
1573 case LTTNG_KERNEL_ABI_KRETPROBE
:
1574 module_put(event_priv
->desc
->owner
);
1575 lttng_kretprobes_destroy_private(event_recorder
);
1578 case LTTNG_KERNEL_ABI_SYSCALL
:
1581 case LTTNG_KERNEL_ABI_UPROBE
:
1582 module_put(event_priv
->desc
->owner
);
1583 lttng_uprobes_destroy_event_private(event_recorder
);
1586 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1587 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1591 list_del(&event_recorder
->priv
->node
);
1592 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1593 kmem_cache_free(event_recorder_cache
, event_recorder
);
1596 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1598 struct lttng_kernel_event_notifier
*event_notifier
=
1599 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1601 switch (event_notifier
->priv
->parent
.instrumentation
) {
1602 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1603 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1606 case LTTNG_KERNEL_ABI_KPROBE
:
1607 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1608 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1611 case LTTNG_KERNEL_ABI_SYSCALL
:
1614 case LTTNG_KERNEL_ABI_UPROBE
:
1615 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1616 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1619 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1620 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1621 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1625 list_del(&event_notifier
->priv
->node
);
1626 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1627 kmem_cache_free(event_notifier_cache
, event_notifier
);
1635 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1636 enum tracker_type tracker_type
)
1638 switch (tracker_type
) {
1640 return &session
->pid_tracker
;
1642 return &session
->vpid_tracker
;
1644 return &session
->uid_tracker
;
1646 return &session
->vuid_tracker
;
1648 return &session
->gid_tracker
;
1650 return &session
->vgid_tracker
;
1657 int lttng_session_track_id(struct lttng_session
*session
,
1658 enum tracker_type tracker_type
, int id
)
1660 struct lttng_id_tracker
*tracker
;
1663 tracker
= get_tracker(session
, tracker_type
);
1668 mutex_lock(&sessions_mutex
);
1670 /* track all ids: destroy tracker. */
1671 lttng_id_tracker_destroy(tracker
, true);
1674 ret
= lttng_id_tracker_add(tracker
, id
);
1676 mutex_unlock(&sessions_mutex
);
1680 int lttng_session_untrack_id(struct lttng_session
*session
,
1681 enum tracker_type tracker_type
, int id
)
1683 struct lttng_id_tracker
*tracker
;
1686 tracker
= get_tracker(session
, tracker_type
);
1691 mutex_lock(&sessions_mutex
);
1693 /* untrack all ids: replace by empty tracker. */
1694 ret
= lttng_id_tracker_empty_set(tracker
);
1696 ret
= lttng_id_tracker_del(tracker
, id
);
1698 mutex_unlock(&sessions_mutex
);
1703 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1705 struct lttng_id_tracker
*id_tracker
= m
->private;
1706 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1707 struct lttng_id_hash_node
*e
;
1710 mutex_lock(&sessions_mutex
);
1712 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1713 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1715 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1721 /* ID tracker disabled. */
1722 if (iter
>= *pos
&& iter
== 0) {
1723 return id_tracker_p
; /* empty tracker */
1731 /* Called with sessions_mutex held. */
1733 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1735 struct lttng_id_tracker
*id_tracker
= m
->private;
1736 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1737 struct lttng_id_hash_node
*e
;
1742 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1743 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1745 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1746 if (iter
++ >= *ppos
)
1751 /* ID tracker disabled. */
1752 if (iter
>= *ppos
&& iter
== 0)
1753 return p
; /* empty tracker */
1762 void id_list_stop(struct seq_file
*m
, void *p
)
1764 mutex_unlock(&sessions_mutex
);
1768 int id_list_show(struct seq_file
*m
, void *p
)
1770 struct lttng_id_tracker
*id_tracker
= m
->private;
1771 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1774 if (p
== id_tracker_p
) {
1775 /* Tracker disabled. */
1778 const struct lttng_id_hash_node
*e
= p
;
1780 id
= lttng_id_tracker_get_node_id(e
);
1782 switch (id_tracker
->tracker_type
) {
1784 seq_printf(m
, "process { pid = %d; };\n", id
);
1787 seq_printf(m
, "process { vpid = %d; };\n", id
);
1790 seq_printf(m
, "user { uid = %d; };\n", id
);
1793 seq_printf(m
, "user { vuid = %d; };\n", id
);
1796 seq_printf(m
, "group { gid = %d; };\n", id
);
1799 seq_printf(m
, "group { vgid = %d; };\n", id
);
1802 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1808 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1809 .start
= id_list_start
,
1810 .next
= id_list_next
,
1811 .stop
= id_list_stop
,
1812 .show
= id_list_show
,
1816 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1818 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1822 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1824 struct seq_file
*m
= file
->private_data
;
1825 struct lttng_id_tracker
*id_tracker
= m
->private;
1828 WARN_ON_ONCE(!id_tracker
);
1829 ret
= seq_release(inode
, file
);
1831 fput(id_tracker
->session
->file
);
1835 const struct file_operations lttng_tracker_ids_list_fops
= {
1836 .owner
= THIS_MODULE
,
1837 .open
= lttng_tracker_ids_list_open
,
1839 .llseek
= seq_lseek
,
1840 .release
= lttng_tracker_ids_list_release
,
1843 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1844 enum tracker_type tracker_type
)
1846 struct file
*tracker_ids_list_file
;
1850 file_fd
= lttng_get_unused_fd();
1856 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1857 <tng_tracker_ids_list_fops
,
1859 if (IS_ERR(tracker_ids_list_file
)) {
1860 ret
= PTR_ERR(tracker_ids_list_file
);
1863 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1865 goto refcount_error
;
1867 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1870 m
= tracker_ids_list_file
->private_data
;
1872 m
->private = get_tracker(session
, tracker_type
);
1873 BUG_ON(!m
->private);
1874 fd_install(file_fd
, tracker_ids_list_file
);
1879 atomic_long_dec(&session
->file
->f_count
);
1881 fput(tracker_ids_list_file
);
1883 put_unused_fd(file_fd
);
1889 * Enabler management.
1892 int lttng_match_enabler_star_glob(const char *desc_name
,
1893 const char *pattern
)
1895 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1896 desc_name
, LTTNG_SIZE_MAX
))
1902 int lttng_match_enabler_name(const char *desc_name
,
1905 if (strcmp(desc_name
, name
))
1910 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1911 struct lttng_enabler
*enabler
)
1913 const char *desc_name
, *enabler_name
;
1914 bool compat
= false, entry
= false;
1916 enabler_name
= enabler
->event_param
.name
;
1917 switch (enabler
->event_param
.instrumentation
) {
1918 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1919 desc_name
= desc
->event_name
;
1920 switch (enabler
->format_type
) {
1921 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1922 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1923 case LTTNG_ENABLER_FORMAT_NAME
:
1924 return lttng_match_enabler_name(desc_name
, enabler_name
);
1930 case LTTNG_KERNEL_ABI_SYSCALL
:
1931 desc_name
= desc
->event_name
;
1932 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1933 desc_name
+= strlen("compat_");
1936 if (!strncmp(desc_name
, "syscall_exit_",
1937 strlen("syscall_exit_"))) {
1938 desc_name
+= strlen("syscall_exit_");
1939 } else if (!strncmp(desc_name
, "syscall_entry_",
1940 strlen("syscall_entry_"))) {
1941 desc_name
+= strlen("syscall_entry_");
1947 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1948 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1950 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1954 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1961 switch (enabler
->event_param
.u
.syscall
.abi
) {
1962 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1964 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1968 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1975 switch (enabler
->event_param
.u
.syscall
.match
) {
1976 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1977 switch (enabler
->format_type
) {
1978 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1979 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1980 case LTTNG_ENABLER_FORMAT_NAME
:
1981 return lttng_match_enabler_name(desc_name
, enabler_name
);
1986 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1987 return -EINVAL
; /* Not implemented. */
2000 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2001 struct lttng_kernel_event_recorder
*event_recorder
)
2003 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2006 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2008 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2009 && event_recorder
->chan
== event_enabler
->chan
)
2016 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2017 struct lttng_kernel_event_notifier
*event_notifier
)
2019 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2020 event_notifier_enabler
);
2022 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2024 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2025 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2026 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2033 struct lttng_enabler_ref
*lttng_enabler_ref(
2034 struct list_head
*enablers_ref_list
,
2035 struct lttng_enabler
*enabler
)
2037 struct lttng_enabler_ref
*enabler_ref
;
2039 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2040 if (enabler_ref
->ref
== enabler
)
2047 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2049 struct lttng_session
*session
= event_enabler
->chan
->session
;
2050 struct lttng_kernel_probe_desc
*probe_desc
;
2051 const struct lttng_kernel_event_desc
*desc
;
2053 struct list_head
*probe_list
;
2055 probe_list
= lttng_get_probe_list_head();
2057 * For each probe event, if we find that a probe event matches
2058 * our enabler, create an associated lttng_event if not
2061 list_for_each_entry(probe_desc
, probe_list
, head
) {
2062 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2064 struct hlist_head
*head
;
2065 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2066 struct lttng_kernel_event_recorder
*event_recorder
;
2068 desc
= probe_desc
->event_desc
[i
];
2069 if (!lttng_desc_match_enabler(desc
,
2070 lttng_event_enabler_as_enabler(event_enabler
)))
2074 * Check if already created.
2076 head
= utils_borrow_hash_table_bucket(
2077 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2079 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2080 if (event_recorder_private
->parent
.desc
== desc
2081 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2088 * We need to create an event for this
2091 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2092 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2093 if (!event_recorder
) {
2094 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2095 probe_desc
->event_desc
[i
]->event_name
);
2102 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2104 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2105 struct lttng_kernel_probe_desc
*probe_desc
;
2106 const struct lttng_kernel_event_desc
*desc
;
2108 struct list_head
*probe_list
;
2110 probe_list
= lttng_get_probe_list_head();
2112 * For each probe event, if we find that a probe event matches
2113 * our enabler, create an associated lttng_event_notifier if not
2116 list_for_each_entry(probe_desc
, probe_list
, head
) {
2117 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2119 struct hlist_head
*head
;
2120 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2121 struct lttng_kernel_event_notifier
*event_notifier
;
2123 desc
= probe_desc
->event_desc
[i
];
2124 if (!lttng_desc_match_enabler(desc
,
2125 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2129 * Check if already created.
2131 head
= utils_borrow_hash_table_bucket(
2132 event_notifier_group
->event_notifiers_ht
.table
,
2133 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2134 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2135 if (event_notifier_priv
->parent
.desc
== desc
2136 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2143 * We need to create a event_notifier for this event probe.
2145 event_notifier
= _lttng_event_notifier_create(desc
,
2146 event_notifier_enabler
->base
.user_token
,
2147 event_notifier_enabler
->error_counter_index
,
2148 event_notifier_group
, NULL
,
2149 LTTNG_KERNEL_ABI_TRACEPOINT
);
2150 if (IS_ERR(event_notifier
)) {
2151 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2152 probe_desc
->event_desc
[i
]->event_name
);
2159 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2163 ret
= lttng_syscalls_register_event(event_enabler
);
2168 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2172 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2174 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2179 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2180 * tracepoint probes.
2181 * Should be called with sessions mutex held.
2184 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2186 switch (event_enabler
->base
.event_param
.instrumentation
) {
2187 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2188 lttng_create_tracepoint_event_if_missing(event_enabler
);
2191 case LTTNG_KERNEL_ABI_SYSCALL
:
2192 lttng_create_syscall_event_if_missing(event_enabler
);
2202 * Create events associated with an event_enabler (if not already present),
2203 * and add backward reference from the event to the enabler.
2204 * Should be called with sessions mutex held.
2207 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2209 struct lttng_channel
*chan
= event_enabler
->chan
;
2210 struct lttng_session
*session
= event_enabler
->chan
->session
;
2211 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2212 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2214 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2215 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2216 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2217 !strcmp(base_enabler
->event_param
.name
, "*")) {
2218 int enabled
= base_enabler
->enabled
;
2219 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2221 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2222 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2224 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2225 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2228 /* First ensure that probe events are created for this enabler. */
2229 lttng_create_event_if_missing(event_enabler
);
2231 /* For each event matching event_enabler in session event list. */
2232 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
2233 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2234 struct lttng_enabler_ref
*enabler_ref
;
2236 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2238 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2239 lttng_event_enabler_as_enabler(event_enabler
));
2242 * If no backward ref, create it.
2243 * Add backward ref from event to event_enabler.
2245 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2248 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2249 list_add(&enabler_ref
->node
,
2250 &event_recorder_priv
->parent
.enablers_ref_head
);
2254 * Link filter bytecodes if not linked yet.
2256 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2258 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2259 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2265 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2266 * tracepoint probes.
2267 * Should be called with sessions mutex held.
2270 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2272 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2273 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2274 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2277 case LTTNG_KERNEL_ABI_SYSCALL
:
2278 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2288 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2291 int lttng_event_notifier_enabler_ref_event_notifiers(
2292 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2294 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2295 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2296 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2298 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2299 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2300 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2301 !strcmp(base_enabler
->event_param
.name
, "*")) {
2303 int enabled
= base_enabler
->enabled
;
2304 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2306 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2307 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2309 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2310 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2314 /* First ensure that probe event_notifiers are created for this enabler. */
2315 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2317 /* Link the created event_notifier with its associated enabler. */
2318 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2319 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2320 struct lttng_enabler_ref
*enabler_ref
;
2322 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2325 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2326 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2329 * If no backward ref, create it.
2330 * Add backward ref from event_notifier to enabler.
2332 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2336 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2337 event_notifier_enabler
);
2338 list_add(&enabler_ref
->node
,
2339 &event_notifier_priv
->parent
.enablers_ref_head
);
2343 * Link filter bytecodes if not linked yet.
2345 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2346 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2347 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2349 /* Link capture bytecodes if not linked yet. */
2350 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2351 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2352 &event_notifier_enabler
->capture_bytecode_head
);
2354 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2360 * Called at module load: connect the probe on all enablers matching
2362 * Called with sessions lock held.
2364 int lttng_fix_pending_events(void)
2366 struct lttng_session
*session
;
2368 list_for_each_entry(session
, &sessions
, list
)
2369 lttng_session_lazy_sync_event_enablers(session
);
2373 static bool lttng_event_notifier_group_has_active_event_notifiers(
2374 struct lttng_event_notifier_group
*event_notifier_group
)
2376 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2378 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2380 if (event_notifier_enabler
->base
.enabled
)
2386 bool lttng_event_notifier_active(void)
2388 struct lttng_event_notifier_group
*event_notifier_group
;
2390 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2391 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2397 int lttng_fix_pending_event_notifiers(void)
2399 struct lttng_event_notifier_group
*event_notifier_group
;
2401 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2402 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2406 struct lttng_event_enabler
*lttng_event_enabler_create(
2407 enum lttng_enabler_format_type format_type
,
2408 struct lttng_kernel_abi_event
*event_param
,
2409 struct lttng_channel
*chan
)
2411 struct lttng_event_enabler
*event_enabler
;
2413 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2416 event_enabler
->base
.format_type
= format_type
;
2417 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2418 memcpy(&event_enabler
->base
.event_param
, event_param
,
2419 sizeof(event_enabler
->base
.event_param
));
2420 event_enabler
->chan
= chan
;
2422 event_enabler
->base
.enabled
= 0;
2423 mutex_lock(&sessions_mutex
);
2424 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2425 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2426 mutex_unlock(&sessions_mutex
);
2427 return event_enabler
;
2430 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2432 mutex_lock(&sessions_mutex
);
2433 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2434 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2435 mutex_unlock(&sessions_mutex
);
2439 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2441 mutex_lock(&sessions_mutex
);
2442 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2443 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2444 mutex_unlock(&sessions_mutex
);
2449 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2450 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2452 struct lttng_bytecode_node
*bytecode_node
;
2453 uint32_t bytecode_len
;
2456 ret
= get_user(bytecode_len
, &bytecode
->len
);
2459 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2463 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2464 sizeof(*bytecode
) + bytecode_len
);
2468 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2469 bytecode_node
->enabler
= enabler
;
2470 /* Enforce length based on allocated size */
2471 bytecode_node
->bc
.len
= bytecode_len
;
2472 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2477 lttng_kvfree(bytecode_node
);
2481 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2482 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2485 ret
= lttng_enabler_attach_filter_bytecode(
2486 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2490 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2497 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2498 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2501 switch (event
->priv
->instrumentation
) {
2502 case LTTNG_KERNEL_ABI_UPROBE
:
2503 return lttng_uprobes_event_add_callsite(event
, callsite
);
2510 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2512 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2514 /* Destroy filter bytecode */
2515 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2516 &enabler
->filter_bytecode_head
, node
) {
2517 lttng_kvfree(filter_node
);
2522 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2524 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2526 list_del(&event_enabler
->node
);
2527 kfree(event_enabler
);
2530 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2531 struct lttng_event_notifier_group
*event_notifier_group
,
2532 enum lttng_enabler_format_type format_type
,
2533 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2535 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2537 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2538 if (!event_notifier_enabler
)
2541 event_notifier_enabler
->base
.format_type
= format_type
;
2542 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2543 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2545 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2546 event_notifier_enabler
->num_captures
= 0;
2548 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2549 sizeof(event_notifier_enabler
->base
.event_param
));
2551 event_notifier_enabler
->base
.enabled
= 0;
2552 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2553 event_notifier_enabler
->group
= event_notifier_group
;
2555 mutex_lock(&sessions_mutex
);
2556 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2557 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2559 mutex_unlock(&sessions_mutex
);
2561 return event_notifier_enabler
;
2564 int lttng_event_notifier_enabler_enable(
2565 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2567 mutex_lock(&sessions_mutex
);
2568 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2569 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2570 mutex_unlock(&sessions_mutex
);
2574 int lttng_event_notifier_enabler_disable(
2575 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2577 mutex_lock(&sessions_mutex
);
2578 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2579 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2580 mutex_unlock(&sessions_mutex
);
2584 int lttng_event_notifier_enabler_attach_filter_bytecode(
2585 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2586 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2590 ret
= lttng_enabler_attach_filter_bytecode(
2591 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2596 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2603 int lttng_event_notifier_enabler_attach_capture_bytecode(
2604 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2605 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2607 struct lttng_bytecode_node
*bytecode_node
;
2608 struct lttng_enabler
*enabler
=
2609 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2610 uint32_t bytecode_len
;
2613 ret
= get_user(bytecode_len
, &bytecode
->len
);
2617 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2622 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2623 sizeof(*bytecode
) + bytecode_len
);
2627 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2628 bytecode_node
->enabler
= enabler
;
2630 /* Enforce length based on allocated size */
2631 bytecode_node
->bc
.len
= bytecode_len
;
2632 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2634 event_notifier_enabler
->num_captures
++;
2636 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2640 lttng_kvfree(bytecode_node
);
2646 void lttng_event_notifier_enabler_destroy(
2647 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2649 if (!event_notifier_enabler
) {
2653 list_del(&event_notifier_enabler
->node
);
2655 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2656 kfree(event_notifier_enabler
);
2660 * lttng_session_sync_event_enablers should be called just before starting a
2662 * Should be called with sessions mutex held.
2665 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2667 struct lttng_event_enabler
*event_enabler
;
2668 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2670 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2671 lttng_event_enabler_ref_events(event_enabler
);
2673 * For each event, if at least one of its enablers is enabled,
2674 * and its channel and session transient states are enabled, we
2675 * enable the event, else we disable it.
2677 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
2678 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2679 struct lttng_enabler_ref
*enabler_ref
;
2680 struct lttng_bytecode_runtime
*runtime
;
2681 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2684 switch (event_recorder_priv
->parent
.instrumentation
) {
2685 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2686 case LTTNG_KERNEL_ABI_SYSCALL
:
2688 list_for_each_entry(enabler_ref
,
2689 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2690 if (enabler_ref
->ref
->enabled
) {
2698 /* Not handled with lazy sync. */
2702 * Enabled state is based on union of enablers, with
2703 * intesection of session and channel transient enable
2706 enabled
= enabled
&& session
->tstate
&& event_recorder
->chan
->tstate
;
2708 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2710 * Sync tracepoint registration with event enabled
2714 register_event(event_recorder
);
2716 _lttng_event_unregister(event_recorder
);
2719 /* Check if has enablers without bytecode enabled */
2720 list_for_each_entry(enabler_ref
,
2721 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2722 if (enabler_ref
->ref
->enabled
2723 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2724 has_enablers_without_filter_bytecode
= 1;
2728 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2729 has_enablers_without_filter_bytecode
;
2731 /* Enable filters */
2732 list_for_each_entry(runtime
,
2733 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2734 lttng_bytecode_sync_state(runtime
);
2737 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2738 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2743 * Apply enablers to session events, adding events to session if need
2744 * be. It is required after each modification applied to an active
2745 * session, and right before session "start".
2746 * "lazy" sync means we only sync if required.
2747 * Should be called with sessions mutex held.
2750 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2752 /* We can skip if session is not active */
2753 if (!session
->active
)
2755 lttng_session_sync_event_enablers(session
);
2759 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2761 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2762 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2764 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2765 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2768 * For each event_notifier, if at least one of its enablers is enabled,
2769 * we enable the event_notifier, else we disable it.
2771 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2772 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2773 struct lttng_enabler_ref
*enabler_ref
;
2774 struct lttng_bytecode_runtime
*runtime
;
2775 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2776 int nr_filters
= 0, nr_captures
= 0;
2778 switch (event_notifier_priv
->parent
.instrumentation
) {
2779 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2780 case LTTNG_KERNEL_ABI_SYSCALL
:
2781 /* Enable event_notifiers */
2782 list_for_each_entry(enabler_ref
,
2783 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2784 if (enabler_ref
->ref
->enabled
) {
2792 /* Not handled with sync. */
2796 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2798 * Sync tracepoint registration with event_notifier enabled
2802 if (!event_notifier_priv
->parent
.registered
)
2803 register_event_notifier(event_notifier
);
2805 if (event_notifier_priv
->parent
.registered
)
2806 _lttng_event_notifier_unregister(event_notifier
);
2809 /* Check if has enablers without bytecode enabled */
2810 list_for_each_entry(enabler_ref
,
2811 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2812 if (enabler_ref
->ref
->enabled
2813 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2814 has_enablers_without_filter_bytecode
= 1;
2818 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2819 has_enablers_without_filter_bytecode
;
2821 /* Enable filters */
2822 list_for_each_entry(runtime
,
2823 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2824 lttng_bytecode_sync_state(runtime
);
2827 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2828 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2830 /* Enable captures */
2831 list_for_each_entry(runtime
,
2832 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2833 lttng_bytecode_sync_state(runtime
);
2836 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2841 * Serialize at most one packet worth of metadata into a metadata
2843 * We grab the metadata cache mutex to get exclusive access to our metadata
2844 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2845 * allows us to do racy operations such as looking for remaining space left in
2846 * packet and write, since mutual exclusion protects us from concurrent writes.
2847 * Mutual exclusion on the metadata cache allow us to read the cache content
2848 * without racing against reallocation of the cache by updates.
2849 * Returns the number of bytes written in the channel, 0 if no data
2850 * was written and a negative value on error.
2852 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2853 struct channel
*chan
, bool *coherent
)
2855 struct lib_ring_buffer_ctx ctx
;
2857 size_t len
, reserve_len
;
2860 * Ensure we support mutiple get_next / put sequences followed by
2861 * put_next. The metadata cache lock protects reading the metadata
2862 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2863 * "flush" operations on the buffer invoked by different processes.
2864 * Moreover, since the metadata cache memory can be reallocated, we
2865 * need to have exclusive access against updates even though we only
2868 mutex_lock(&stream
->metadata_cache
->lock
);
2869 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2870 if (stream
->metadata_in
!= stream
->metadata_out
)
2873 /* Metadata regenerated, change the version. */
2874 if (stream
->metadata_cache
->version
!= stream
->version
)
2875 stream
->version
= stream
->metadata_cache
->version
;
2877 len
= stream
->metadata_cache
->metadata_written
-
2878 stream
->metadata_in
;
2881 reserve_len
= min_t(size_t,
2882 stream
->transport
->ops
.packet_avail_size(chan
),
2884 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2885 sizeof(char), NULL
);
2887 * If reservation failed, return an error to the caller.
2889 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2891 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2892 stream
->coherent
= false;
2895 stream
->transport
->ops
.event_write(&ctx
,
2896 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2898 stream
->transport
->ops
.event_commit(&ctx
);
2899 stream
->metadata_in
+= reserve_len
;
2900 if (reserve_len
< len
)
2901 stream
->coherent
= false;
2903 stream
->coherent
= true;
2908 *coherent
= stream
->coherent
;
2909 mutex_unlock(&stream
->metadata_cache
->lock
);
2914 void lttng_metadata_begin(struct lttng_session
*session
)
2916 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2917 mutex_lock(&session
->metadata_cache
->lock
);
2921 void lttng_metadata_end(struct lttng_session
*session
)
2923 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2924 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2925 struct lttng_metadata_stream
*stream
;
2927 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2928 wake_up_interruptible(&stream
->read_wait
);
2929 mutex_unlock(&session
->metadata_cache
->lock
);
2934 * Write the metadata to the metadata cache.
2935 * Must be called with sessions_mutex held.
2936 * The metadata cache lock protects us from concurrent read access from
2937 * thread outputting metadata content to ring buffer.
2938 * The content of the printf is printed as a single atomic metadata
2941 int lttng_metadata_printf(struct lttng_session
*session
,
2942 const char *fmt
, ...)
2948 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2951 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2957 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2958 if (session
->metadata_cache
->metadata_written
+ len
>
2959 session
->metadata_cache
->cache_alloc
) {
2960 char *tmp_cache_realloc
;
2961 unsigned int tmp_cache_alloc_size
;
2963 tmp_cache_alloc_size
= max_t(unsigned int,
2964 session
->metadata_cache
->cache_alloc
+ len
,
2965 session
->metadata_cache
->cache_alloc
<< 1);
2966 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2967 if (!tmp_cache_realloc
)
2969 if (session
->metadata_cache
->data
) {
2970 memcpy(tmp_cache_realloc
,
2971 session
->metadata_cache
->data
,
2972 session
->metadata_cache
->cache_alloc
);
2973 vfree(session
->metadata_cache
->data
);
2976 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2977 session
->metadata_cache
->data
= tmp_cache_realloc
;
2979 memcpy(session
->metadata_cache
->data
+
2980 session
->metadata_cache
->metadata_written
,
2982 session
->metadata_cache
->metadata_written
+= len
;
2993 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2997 for (i
= 0; i
< nesting
; i
++) {
3000 ret
= lttng_metadata_printf(session
, " ");
3009 int lttng_field_name_statedump(struct lttng_session
*session
,
3010 const struct lttng_kernel_event_field
*field
,
3013 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3017 int _lttng_integer_type_statedump(struct lttng_session
*session
,
3018 const struct lttng_kernel_type_integer
*type
,
3019 enum lttng_kernel_string_encoding parent_encoding
,
3024 ret
= print_tabs(session
, nesting
);
3027 ret
= lttng_metadata_printf(session
,
3028 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3032 (parent_encoding
== lttng_kernel_string_encoding_none
)
3034 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3038 #if __BYTE_ORDER == __BIG_ENDIAN
3039 type
->reverse_byte_order
? " byte_order = le;" : ""
3041 type
->reverse_byte_order
? " byte_order = be;" : ""
3048 * Must be called with sessions_mutex held.
3051 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3052 const struct lttng_kernel_type_struct
*type
,
3055 const char *prev_field_name
= NULL
;
3057 uint32_t i
, nr_fields
;
3058 unsigned int alignment
;
3060 ret
= print_tabs(session
, nesting
);
3063 ret
= lttng_metadata_printf(session
,
3067 nr_fields
= type
->nr_fields
;
3068 for (i
= 0; i
< nr_fields
; i
++) {
3069 const struct lttng_kernel_event_field
*iter_field
;
3071 iter_field
= type
->fields
[i
];
3072 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3076 ret
= print_tabs(session
, nesting
);
3079 alignment
= type
->alignment
;
3081 ret
= lttng_metadata_printf(session
,
3085 ret
= lttng_metadata_printf(session
,
3092 * Must be called with sessions_mutex held.
3095 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3096 const struct lttng_kernel_event_field
*field
,
3101 ret
= _lttng_struct_type_statedump(session
,
3102 lttng_kernel_get_type_struct(field
->type
), nesting
);
3105 return lttng_field_name_statedump(session
, field
, nesting
);
3109 * Must be called with sessions_mutex held.
3112 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3113 const struct lttng_kernel_type_variant
*type
,
3115 const char *prev_field_name
)
3117 const char *tag_name
;
3119 uint32_t i
, nr_choices
;
3121 tag_name
= type
->tag_name
;
3123 tag_name
= prev_field_name
;
3127 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3129 if (type
->alignment
!= 0)
3131 ret
= print_tabs(session
, nesting
);
3134 ret
= lttng_metadata_printf(session
,
3135 "variant <_%s> {\n",
3139 nr_choices
= type
->nr_choices
;
3140 for (i
= 0; i
< nr_choices
; i
++) {
3141 const struct lttng_kernel_event_field
*iter_field
;
3143 iter_field
= type
->choices
[i
];
3144 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3148 ret
= print_tabs(session
, nesting
);
3151 ret
= lttng_metadata_printf(session
,
3157 * Must be called with sessions_mutex held.
3160 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3161 const struct lttng_kernel_event_field
*field
,
3163 const char *prev_field_name
)
3167 ret
= _lttng_variant_type_statedump(session
,
3168 lttng_kernel_get_type_variant(field
->type
), nesting
,
3172 return lttng_field_name_statedump(session
, field
, nesting
);
3176 * Must be called with sessions_mutex held.
3179 int _lttng_array_field_statedump(struct lttng_session
*session
,
3180 const struct lttng_kernel_event_field
*field
,
3184 const struct lttng_kernel_type_array
*array_type
;
3185 const struct lttng_kernel_type_common
*elem_type
;
3187 array_type
= lttng_kernel_get_type_array(field
->type
);
3188 WARN_ON_ONCE(!array_type
);
3190 if (array_type
->alignment
) {
3191 ret
= print_tabs(session
, nesting
);
3194 ret
= lttng_metadata_printf(session
,
3195 "struct { } align(%u) _%s_padding;\n",
3196 array_type
->alignment
* CHAR_BIT
,
3202 * Nested compound types: Only array of structures and variants are
3203 * currently supported.
3205 elem_type
= array_type
->elem_type
;
3206 switch (elem_type
->type
) {
3207 case lttng_kernel_type_integer
:
3208 case lttng_kernel_type_struct
:
3209 case lttng_kernel_type_variant
:
3210 ret
= _lttng_type_statedump(session
, elem_type
,
3211 array_type
->encoding
, nesting
);
3219 ret
= lttng_metadata_printf(session
,
3222 array_type
->length
);
3227 * Must be called with sessions_mutex held.
3230 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3231 const struct lttng_kernel_event_field
*field
,
3233 const char *prev_field_name
)
3236 const char *length_name
;
3237 const struct lttng_kernel_type_sequence
*sequence_type
;
3238 const struct lttng_kernel_type_common
*elem_type
;
3240 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3241 WARN_ON_ONCE(!sequence_type
);
3243 length_name
= sequence_type
->length_name
;
3245 length_name
= prev_field_name
;
3249 if (sequence_type
->alignment
) {
3250 ret
= print_tabs(session
, nesting
);
3253 ret
= lttng_metadata_printf(session
,
3254 "struct { } align(%u) _%s_padding;\n",
3255 sequence_type
->alignment
* CHAR_BIT
,
3262 * Nested compound types: Only array of structures and variants are
3263 * currently supported.
3265 elem_type
= sequence_type
->elem_type
;
3266 switch (elem_type
->type
) {
3267 case lttng_kernel_type_integer
:
3268 case lttng_kernel_type_struct
:
3269 case lttng_kernel_type_variant
:
3270 ret
= _lttng_type_statedump(session
, elem_type
,
3271 sequence_type
->encoding
, nesting
);
3279 ret
= lttng_metadata_printf(session
,
3287 * Must be called with sessions_mutex held.
3290 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3291 const struct lttng_kernel_type_enum
*type
,
3294 const struct lttng_kernel_enum_desc
*enum_desc
;
3295 const struct lttng_kernel_type_common
*container_type
;
3297 unsigned int i
, nr_entries
;
3299 container_type
= type
->container_type
;
3300 if (container_type
->type
!= lttng_kernel_type_integer
) {
3304 enum_desc
= type
->desc
;
3305 nr_entries
= enum_desc
->nr_entries
;
3307 ret
= print_tabs(session
, nesting
);
3310 ret
= lttng_metadata_printf(session
, "enum : ");
3313 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3314 lttng_kernel_string_encoding_none
, 0);
3317 ret
= lttng_metadata_printf(session
, " {\n");
3320 /* Dump all entries */
3321 for (i
= 0; i
< nr_entries
; i
++) {
3322 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3325 ret
= print_tabs(session
, nesting
+ 1);
3328 ret
= lttng_metadata_printf(session
,
3332 len
= strlen(entry
->string
);
3333 /* Escape the character '"' */
3334 for (j
= 0; j
< len
; j
++) {
3335 char c
= entry
->string
[j
];
3339 ret
= lttng_metadata_printf(session
,
3343 ret
= lttng_metadata_printf(session
,
3347 ret
= lttng_metadata_printf(session
,
3354 ret
= lttng_metadata_printf(session
, "\"");
3358 if (entry
->options
.is_auto
) {
3359 ret
= lttng_metadata_printf(session
, ",\n");
3363 ret
= lttng_metadata_printf(session
,
3367 if (entry
->start
.signedness
)
3368 ret
= lttng_metadata_printf(session
,
3369 "%lld", (long long) entry
->start
.value
);
3371 ret
= lttng_metadata_printf(session
,
3372 "%llu", entry
->start
.value
);
3375 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3377 == entry
->end
.value
) {
3378 ret
= lttng_metadata_printf(session
,
3381 if (entry
->end
.signedness
) {
3382 ret
= lttng_metadata_printf(session
,
3384 (long long) entry
->end
.value
);
3386 ret
= lttng_metadata_printf(session
,
3395 ret
= print_tabs(session
, nesting
);
3398 ret
= lttng_metadata_printf(session
, "}");
3404 * Must be called with sessions_mutex held.
3407 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3408 const struct lttng_kernel_event_field
*field
,
3412 const struct lttng_kernel_type_enum
*enum_type
;
3414 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3415 WARN_ON_ONCE(!enum_type
);
3416 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3419 return lttng_field_name_statedump(session
, field
, nesting
);
3423 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3424 const struct lttng_kernel_event_field
*field
,
3429 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3430 lttng_kernel_string_encoding_none
, nesting
);
3433 return lttng_field_name_statedump(session
, field
, nesting
);
3437 int _lttng_string_type_statedump(struct lttng_session
*session
,
3438 const struct lttng_kernel_type_string
*type
,
3443 /* Default encoding is UTF8 */
3444 ret
= print_tabs(session
, nesting
);
3447 ret
= lttng_metadata_printf(session
,
3449 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3450 " { encoding = ASCII; }" : "");
3455 int _lttng_string_field_statedump(struct lttng_session
*session
,
3456 const struct lttng_kernel_event_field
*field
,
3459 const struct lttng_kernel_type_string
*string_type
;
3462 string_type
= lttng_kernel_get_type_string(field
->type
);
3463 WARN_ON_ONCE(!string_type
);
3464 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3467 return lttng_field_name_statedump(session
, field
, nesting
);
3471 * Must be called with sessions_mutex held.
3474 int _lttng_type_statedump(struct lttng_session
*session
,
3475 const struct lttng_kernel_type_common
*type
,
3476 enum lttng_kernel_string_encoding parent_encoding
,
3481 switch (type
->type
) {
3482 case lttng_kernel_type_integer
:
3483 ret
= _lttng_integer_type_statedump(session
,
3484 lttng_kernel_get_type_integer(type
),
3485 parent_encoding
, nesting
);
3487 case lttng_kernel_type_enum
:
3488 ret
= _lttng_enum_type_statedump(session
,
3489 lttng_kernel_get_type_enum(type
),
3492 case lttng_kernel_type_string
:
3493 ret
= _lttng_string_type_statedump(session
,
3494 lttng_kernel_get_type_string(type
),
3497 case lttng_kernel_type_struct
:
3498 ret
= _lttng_struct_type_statedump(session
,
3499 lttng_kernel_get_type_struct(type
),
3502 case lttng_kernel_type_variant
:
3503 ret
= _lttng_variant_type_statedump(session
,
3504 lttng_kernel_get_type_variant(type
),
3508 /* Nested arrays and sequences are not supported yet. */
3509 case lttng_kernel_type_array
:
3510 case lttng_kernel_type_sequence
:
3519 * Must be called with sessions_mutex held.
3522 int _lttng_field_statedump(struct lttng_session
*session
,
3523 const struct lttng_kernel_event_field
*field
,
3525 const char **prev_field_name_p
)
3527 const char *prev_field_name
= NULL
;
3530 if (prev_field_name_p
)
3531 prev_field_name
= *prev_field_name_p
;
3532 switch (field
->type
->type
) {
3533 case lttng_kernel_type_integer
:
3534 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3536 case lttng_kernel_type_enum
:
3537 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3539 case lttng_kernel_type_string
:
3540 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3542 case lttng_kernel_type_struct
:
3543 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3545 case lttng_kernel_type_array
:
3546 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3548 case lttng_kernel_type_sequence
:
3549 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3551 case lttng_kernel_type_variant
:
3552 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3559 if (prev_field_name_p
)
3560 *prev_field_name_p
= field
->name
;
3565 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3566 struct lttng_kernel_ctx
*ctx
)
3568 const char *prev_field_name
= NULL
;
3574 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3575 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3577 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3585 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3586 struct lttng_kernel_event_recorder
*event_recorder
)
3588 const char *prev_field_name
= NULL
;
3589 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3593 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3594 const struct lttng_kernel_event_field
*field
= desc
->fields
[i
];
3596 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3604 * Must be called with sessions_mutex held.
3605 * The entire event metadata is printed as a single atomic metadata
3609 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3610 struct lttng_channel
*chan
,
3611 struct lttng_kernel_event_recorder
*event_recorder
)
3615 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3617 if (chan
->channel_type
== METADATA_CHANNEL
)
3620 lttng_metadata_begin(session
);
3622 ret
= lttng_metadata_printf(session
,
3626 " stream_id = %u;\n",
3627 event_recorder
->priv
->parent
.desc
->event_name
,
3628 event_recorder
->priv
->id
,
3629 event_recorder
->chan
->id
);
3633 ret
= lttng_metadata_printf(session
,
3634 " fields := struct {\n"
3639 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3644 * LTTng space reservation can only reserve multiples of the
3647 ret
= lttng_metadata_printf(session
,
3653 event_recorder
->priv
->metadata_dumped
= 1;
3655 lttng_metadata_end(session
);
3661 * Must be called with sessions_mutex held.
3662 * The entire channel metadata is printed as a single atomic metadata
3666 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3667 struct lttng_channel
*chan
)
3671 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3674 if (chan
->channel_type
== METADATA_CHANNEL
)
3677 lttng_metadata_begin(session
);
3679 WARN_ON_ONCE(!chan
->header_type
);
3680 ret
= lttng_metadata_printf(session
,
3683 " event.header := %s;\n"
3684 " packet.context := struct packet_context;\n",
3686 chan
->header_type
== 1 ? "struct event_header_compact" :
3687 "struct event_header_large");
3692 ret
= lttng_metadata_printf(session
,
3693 " event.context := struct {\n");
3697 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3701 ret
= lttng_metadata_printf(session
,
3707 ret
= lttng_metadata_printf(session
,
3710 chan
->metadata_dumped
= 1;
3712 lttng_metadata_end(session
);
3717 * Must be called with sessions_mutex held.
3720 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3722 return lttng_metadata_printf(session
,
3723 "struct packet_context {\n"
3724 " uint64_clock_monotonic_t timestamp_begin;\n"
3725 " uint64_clock_monotonic_t timestamp_end;\n"
3726 " uint64_t content_size;\n"
3727 " uint64_t packet_size;\n"
3728 " uint64_t packet_seq_num;\n"
3729 " unsigned long events_discarded;\n"
3730 " uint32_t cpu_id;\n"
3737 * id: range: 0 - 30.
3738 * id 31 is reserved to indicate an extended header.
3741 * id: range: 0 - 65534.
3742 * id 65535 is reserved to indicate an extended header.
3744 * Must be called with sessions_mutex held.
3747 int _lttng_event_header_declare(struct lttng_session
*session
)
3749 return lttng_metadata_printf(session
,
3750 "struct event_header_compact {\n"
3751 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3754 " uint27_clock_monotonic_t timestamp;\n"
3758 " uint64_clock_monotonic_t timestamp;\n"
3763 "struct event_header_large {\n"
3764 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3767 " uint32_clock_monotonic_t timestamp;\n"
3771 " uint64_clock_monotonic_t timestamp;\n"
3775 lttng_alignof(uint32_t) * CHAR_BIT
,
3776 lttng_alignof(uint16_t) * CHAR_BIT
3781 * Approximation of NTP time of day to clock monotonic correlation,
3782 * taken at start of trace.
3783 * Yes, this is only an approximation. Yes, we can (and will) do better
3784 * in future versions.
3785 * This function may return a negative offset. It may happen if the
3786 * system sets the REALTIME clock to 0 after boot.
3788 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3792 int64_t measure_clock_offset(void)
3794 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3795 uint64_t tcf
= trace_clock_freq();
3797 unsigned long flags
;
3798 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3799 struct timespec64 rts
= { 0, 0 };
3801 struct timespec rts
= { 0, 0 };
3804 /* Disable interrupts to increase correlation precision. */
3805 local_irq_save(flags
);
3806 monotonic
[0] = trace_clock_read64();
3807 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3808 ktime_get_real_ts64(&rts
);
3810 getnstimeofday(&rts
);
3812 monotonic
[1] = trace_clock_read64();
3813 local_irq_restore(flags
);
3815 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3816 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3817 if (tcf
== NSEC_PER_SEC
) {
3818 realtime
+= rts
.tv_nsec
;
3820 uint64_t n
= rts
.tv_nsec
* tcf
;
3822 do_div(n
, NSEC_PER_SEC
);
3825 offset
= (int64_t) realtime
- monotonic_avg
;
3830 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3838 while (cur
!= '\0') {
3841 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3845 ret
= lttng_metadata_printf(session
, "%c", '\\');
3848 /* We still print the current char */
3851 ret
= lttng_metadata_printf(session
, "%c", cur
);
3865 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3866 const char *field_value
)
3870 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3874 ret
= print_escaped_ctf_string(session
, field_value
);
3878 ret
= lttng_metadata_printf(session
, "\";\n");
3885 * Output metadata into this session's metadata buffers.
3886 * Must be called with sessions_mutex held.
3889 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3891 unsigned char *uuid_c
= session
->uuid
.b
;
3892 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3893 const char *product_uuid
;
3894 struct lttng_channel
*chan
;
3895 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3898 if (!LTTNG_READ_ONCE(session
->active
))
3901 lttng_metadata_begin(session
);
3903 if (session
->metadata_dumped
)
3906 snprintf(uuid_s
, sizeof(uuid_s
),
3907 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3908 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3909 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3910 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3911 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3913 ret
= lttng_metadata_printf(session
,
3914 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3915 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3916 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3917 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3918 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3919 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3920 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3926 " byte_order = %s;\n"
3927 " packet.header := struct {\n"
3928 " uint32_t magic;\n"
3929 " uint8_t uuid[16];\n"
3930 " uint32_t stream_id;\n"
3931 " uint64_t stream_instance_id;\n"
3934 lttng_alignof(uint8_t) * CHAR_BIT
,
3935 lttng_alignof(uint16_t) * CHAR_BIT
,
3936 lttng_alignof(uint32_t) * CHAR_BIT
,
3937 lttng_alignof(uint64_t) * CHAR_BIT
,
3938 sizeof(unsigned long) * CHAR_BIT
,
3939 lttng_alignof(unsigned long) * CHAR_BIT
,
3943 #if __BYTE_ORDER == __BIG_ENDIAN
3952 ret
= lttng_metadata_printf(session
,
3954 " hostname = \"%s\";\n"
3955 " domain = \"kernel\";\n"
3956 " sysname = \"%s\";\n"
3957 " kernel_release = \"%s\";\n"
3958 " kernel_version = \"%s\";\n"
3959 " tracer_name = \"lttng-modules\";\n"
3960 " tracer_major = %d;\n"
3961 " tracer_minor = %d;\n"
3962 " tracer_patchlevel = %d;\n"
3963 " trace_buffering_scheme = \"global\";\n",
3964 current
->nsproxy
->uts_ns
->name
.nodename
,
3968 LTTNG_MODULES_MAJOR_VERSION
,
3969 LTTNG_MODULES_MINOR_VERSION
,
3970 LTTNG_MODULES_PATCHLEVEL_VERSION
3975 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3978 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3979 session
->creation_time
);
3983 /* Add the product UUID to the 'env' section */
3984 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3986 ret
= lttng_metadata_printf(session
,
3987 " product_uuid = \"%s\";\n",
3994 /* Close the 'env' section */
3995 ret
= lttng_metadata_printf(session
, "};\n\n");
3999 ret
= lttng_metadata_printf(session
,
4001 " name = \"%s\";\n",
4007 if (!trace_clock_uuid(clock_uuid_s
)) {
4008 ret
= lttng_metadata_printf(session
,
4009 " uuid = \"%s\";\n",
4016 ret
= lttng_metadata_printf(session
,
4017 " description = \"%s\";\n"
4018 " freq = %llu; /* Frequency, in Hz */\n"
4019 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4022 trace_clock_description(),
4023 (unsigned long long) trace_clock_freq(),
4024 (long long) measure_clock_offset()
4029 ret
= lttng_metadata_printf(session
,
4030 "typealias integer {\n"
4031 " size = 27; align = 1; signed = false;\n"
4032 " map = clock.%s.value;\n"
4033 "} := uint27_clock_monotonic_t;\n"
4035 "typealias integer {\n"
4036 " size = 32; align = %u; signed = false;\n"
4037 " map = clock.%s.value;\n"
4038 "} := uint32_clock_monotonic_t;\n"
4040 "typealias integer {\n"
4041 " size = 64; align = %u; signed = false;\n"
4042 " map = clock.%s.value;\n"
4043 "} := uint64_clock_monotonic_t;\n\n",
4045 lttng_alignof(uint32_t) * CHAR_BIT
,
4047 lttng_alignof(uint64_t) * CHAR_BIT
,
4053 ret
= _lttng_stream_packet_context_declare(session
);
4057 ret
= _lttng_event_header_declare(session
);
4062 list_for_each_entry(chan
, &session
->chan
, list
) {
4063 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4068 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
4069 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4070 event_recorder_priv
->pub
);
4074 session
->metadata_dumped
= 1;
4076 lttng_metadata_end(session
);
4081 * lttng_transport_register - LTT transport registration
4082 * @transport: transport structure
4084 * Registers a transport which can be used as output to extract the data out of
4085 * LTTng. The module calling this registration function must ensure that no
4086 * trap-inducing code will be executed by the transport functions. E.g.
4087 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4088 * is made visible to the transport function. This registration acts as a
4089 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4090 * after its registration must it synchronize the TLBs.
4092 void lttng_transport_register(struct lttng_transport
*transport
)
4095 * Make sure no page fault can be triggered by the module about to be
4096 * registered. We deal with this here so we don't have to call
4097 * vmalloc_sync_mappings() in each module's init.
4099 wrapper_vmalloc_sync_mappings();
4101 mutex_lock(&sessions_mutex
);
4102 list_add_tail(&transport
->node
, <tng_transport_list
);
4103 mutex_unlock(&sessions_mutex
);
4105 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4108 * lttng_transport_unregister - LTT transport unregistration
4109 * @transport: transport structure
4111 void lttng_transport_unregister(struct lttng_transport
*transport
)
4113 mutex_lock(&sessions_mutex
);
4114 list_del(&transport
->node
);
4115 mutex_unlock(&sessions_mutex
);
4117 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4119 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4122 * Make sure no page fault can be triggered by the module about to be
4123 * registered. We deal with this here so we don't have to call
4124 * vmalloc_sync_mappings() in each module's init.
4126 wrapper_vmalloc_sync_mappings();
4128 mutex_lock(&sessions_mutex
);
4129 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4130 mutex_unlock(&sessions_mutex
);
4132 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4134 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4136 mutex_lock(&sessions_mutex
);
4137 list_del(&transport
->node
);
4138 mutex_unlock(&sessions_mutex
);
4140 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4142 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4144 enum cpuhp_state lttng_hp_prepare
;
4145 enum cpuhp_state lttng_hp_online
;
4147 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4149 struct lttng_cpuhp_node
*lttng_node
;
4151 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4152 switch (lttng_node
->component
) {
4153 case LTTNG_RING_BUFFER_FRONTEND
:
4155 case LTTNG_RING_BUFFER_BACKEND
:
4156 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4157 case LTTNG_RING_BUFFER_ITER
:
4159 case LTTNG_CONTEXT_PERF_COUNTERS
:
4166 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4168 struct lttng_cpuhp_node
*lttng_node
;
4170 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4171 switch (lttng_node
->component
) {
4172 case LTTNG_RING_BUFFER_FRONTEND
:
4173 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4174 case LTTNG_RING_BUFFER_BACKEND
:
4176 case LTTNG_RING_BUFFER_ITER
:
4178 case LTTNG_CONTEXT_PERF_COUNTERS
:
4179 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4185 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4187 struct lttng_cpuhp_node
*lttng_node
;
4189 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4190 switch (lttng_node
->component
) {
4191 case LTTNG_RING_BUFFER_FRONTEND
:
4192 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4193 case LTTNG_RING_BUFFER_BACKEND
:
4195 case LTTNG_RING_BUFFER_ITER
:
4196 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4197 case LTTNG_CONTEXT_PERF_COUNTERS
:
4198 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4204 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4206 struct lttng_cpuhp_node
*lttng_node
;
4208 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4209 switch (lttng_node
->component
) {
4210 case LTTNG_RING_BUFFER_FRONTEND
:
4211 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4212 case LTTNG_RING_BUFFER_BACKEND
:
4214 case LTTNG_RING_BUFFER_ITER
:
4216 case LTTNG_CONTEXT_PERF_COUNTERS
:
4223 static int __init
lttng_init_cpu_hotplug(void)
4227 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4228 lttng_hotplug_prepare
,
4229 lttng_hotplug_dead
);
4233 lttng_hp_prepare
= ret
;
4234 lttng_rb_set_hp_prepare(ret
);
4236 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4237 lttng_hotplug_online
,
4238 lttng_hotplug_offline
);
4240 cpuhp_remove_multi_state(lttng_hp_prepare
);
4241 lttng_hp_prepare
= 0;
4244 lttng_hp_online
= ret
;
4245 lttng_rb_set_hp_online(ret
);
4250 static void __exit
lttng_exit_cpu_hotplug(void)
4252 lttng_rb_set_hp_online(0);
4253 cpuhp_remove_multi_state(lttng_hp_online
);
4254 lttng_rb_set_hp_prepare(0);
4255 cpuhp_remove_multi_state(lttng_hp_prepare
);
4258 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4259 static int lttng_init_cpu_hotplug(void)
4263 static void lttng_exit_cpu_hotplug(void)
4266 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4269 static int __init
lttng_events_init(void)
4273 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4276 ret
= wrapper_get_pfnblock_flags_mask_init();
4279 ret
= wrapper_get_pageblock_flags_mask_init();
4282 ret
= lttng_probes_init();
4285 ret
= lttng_context_init();
4288 ret
= lttng_tracepoint_init();
4291 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4292 if (!event_recorder_cache
) {
4294 goto error_kmem_event_recorder
;
4296 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4297 if (!event_recorder_private_cache
) {
4299 goto error_kmem_event_recorder_private
;
4301 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4302 if (!event_notifier_cache
) {
4304 goto error_kmem_event_notifier
;
4306 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4307 if (!event_notifier_private_cache
) {
4309 goto error_kmem_event_notifier_private
;
4311 ret
= lttng_abi_init();
4314 ret
= lttng_logger_init();
4317 ret
= lttng_init_cpu_hotplug();
4320 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4321 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4322 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4323 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4324 LTTNG_MODULES_EXTRAVERSION
,
4326 #ifdef LTTNG_EXTRA_VERSION_GIT
4327 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4331 #ifdef LTTNG_EXTRA_VERSION_NAME
4332 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4339 lttng_logger_exit();
4343 kmem_cache_destroy(event_notifier_private_cache
);
4344 error_kmem_event_notifier_private
:
4345 kmem_cache_destroy(event_notifier_cache
);
4346 error_kmem_event_notifier
:
4347 kmem_cache_destroy(event_recorder_private_cache
);
4348 error_kmem_event_recorder_private
:
4349 kmem_cache_destroy(event_recorder_cache
);
4350 error_kmem_event_recorder
:
4351 lttng_tracepoint_exit();
4353 lttng_context_exit();
4354 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4355 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4356 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4357 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4358 LTTNG_MODULES_EXTRAVERSION
,
4360 #ifdef LTTNG_EXTRA_VERSION_GIT
4361 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4365 #ifdef LTTNG_EXTRA_VERSION_NAME
4366 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4373 module_init(lttng_events_init
);
4375 static void __exit
lttng_events_exit(void)
4377 struct lttng_session
*session
, *tmpsession
;
4379 lttng_exit_cpu_hotplug();
4380 lttng_logger_exit();
4382 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4383 lttng_session_destroy(session
);
4384 kmem_cache_destroy(event_recorder_cache
);
4385 kmem_cache_destroy(event_recorder_private_cache
);
4386 kmem_cache_destroy(event_notifier_cache
);
4387 kmem_cache_destroy(event_notifier_private_cache
);
4388 lttng_tracepoint_exit();
4389 lttng_context_exit();
4390 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4391 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4392 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4393 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4394 LTTNG_MODULES_EXTRAVERSION
,
4396 #ifdef LTTNG_EXTRA_VERSION_GIT
4397 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4401 #ifdef LTTNG_EXTRA_VERSION_NAME
4402 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4408 module_exit(lttng_events_exit
);
4410 #include <generated/patches.h>
4411 #ifdef LTTNG_EXTRA_VERSION_GIT
4412 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4414 #ifdef LTTNG_EXTRA_VERSION_NAME
4415 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4417 MODULE_LICENSE("GPL and additional rights");
4418 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4419 MODULE_DESCRIPTION("LTTng tracer");
4420 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4421 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4422 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4423 LTTNG_MODULES_EXTRAVERSION
);