1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/events-internal.h>
40 #include <lttng/lttng-bytecode.h>
41 #include <lttng/tracer.h>
42 #include <lttng/event-notifier-notification.h>
43 #include <lttng/abi-old.h>
44 #include <lttng/endian.h>
45 #include <lttng/string-utils.h>
46 #include <lttng/utils.h>
47 #include <ringbuffer/backend.h>
48 #include <ringbuffer/frontend.h>
49 #include <wrapper/time.h>
51 #define METADATA_CACHE_DEFAULT_SIZE 4096
53 static LIST_HEAD(sessions
);
54 static LIST_HEAD(event_notifier_groups
);
55 static LIST_HEAD(lttng_transport_list
);
56 static LIST_HEAD(lttng_counter_transport_list
);
58 * Protect the sessions and metadata caches.
60 static DEFINE_MUTEX(sessions_mutex
);
61 static struct kmem_cache
*event_recorder_cache
;
62 static struct kmem_cache
*event_recorder_private_cache
;
63 static struct kmem_cache
*event_notifier_cache
;
64 static struct kmem_cache
*event_notifier_private_cache
;
66 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
67 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
68 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
69 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
70 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event
);
75 static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
77 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
78 struct lttng_channel
*chan
,
79 struct lttng_kernel_event_recorder
*event
);
81 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
83 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
85 int _lttng_type_statedump(struct lttng_session
*session
,
86 const struct lttng_kernel_type_common
*type
,
87 enum lttng_kernel_string_encoding parent_encoding
,
90 int _lttng_field_statedump(struct lttng_session
*session
,
91 const struct lttng_kernel_event_field
*field
,
94 void synchronize_trace(void)
96 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
102 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
103 #ifdef CONFIG_PREEMPT_RT_FULL
106 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
107 #ifdef CONFIG_PREEMPT_RT
110 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
113 void lttng_lock_sessions(void)
115 mutex_lock(&sessions_mutex
);
118 void lttng_unlock_sessions(void)
120 mutex_unlock(&sessions_mutex
);
123 static struct lttng_transport
*lttng_transport_find(const char *name
)
125 struct lttng_transport
*transport
;
127 list_for_each_entry(transport
, <tng_transport_list
, node
) {
128 if (!strcmp(transport
->name
, name
))
135 * Called with sessions lock held.
137 int lttng_session_active(void)
139 struct lttng_session
*iter
;
141 list_for_each_entry(iter
, &sessions
, list
) {
148 struct lttng_session
*lttng_session_create(void)
150 struct lttng_session
*session
;
151 struct lttng_metadata_cache
*metadata_cache
;
154 mutex_lock(&sessions_mutex
);
155 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
158 INIT_LIST_HEAD(&session
->chan
);
159 INIT_LIST_HEAD(&session
->events
);
160 lttng_guid_gen(&session
->uuid
);
162 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
165 goto err_free_session
;
166 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
167 if (!metadata_cache
->data
)
169 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
170 kref_init(&metadata_cache
->refcount
);
171 mutex_init(&metadata_cache
->lock
);
172 session
->metadata_cache
= metadata_cache
;
173 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
174 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
175 sizeof(metadata_cache
->uuid
));
176 INIT_LIST_HEAD(&session
->enablers_head
);
177 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
178 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
179 list_add(&session
->list
, &sessions
);
180 session
->pid_tracker
.session
= session
;
181 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
182 session
->vpid_tracker
.session
= session
;
183 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
184 session
->uid_tracker
.session
= session
;
185 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
186 session
->vuid_tracker
.session
= session
;
187 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
188 session
->gid_tracker
.session
= session
;
189 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
190 session
->vgid_tracker
.session
= session
;
191 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
192 mutex_unlock(&sessions_mutex
);
196 kfree(metadata_cache
);
198 lttng_kvfree(session
);
200 mutex_unlock(&sessions_mutex
);
205 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
207 struct lttng_counter_transport
*transport
;
209 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
210 if (!strcmp(transport
->name
, name
))
216 struct lttng_counter
*lttng_kernel_counter_create(
217 const char *counter_transport_name
,
218 size_t number_dimensions
, const size_t *dimensions_sizes
)
220 struct lttng_counter
*counter
= NULL
;
221 struct lttng_counter_transport
*counter_transport
= NULL
;
223 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
224 if (!counter_transport
) {
225 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
226 counter_transport_name
);
229 if (!try_module_get(counter_transport
->owner
)) {
230 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
234 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
238 /* Create event notifier error counter. */
239 counter
->ops
= &counter_transport
->ops
;
240 counter
->transport
= counter_transport
;
242 counter
->counter
= counter
->ops
->counter_create(
243 number_dimensions
, dimensions_sizes
, 0);
244 if (!counter
->counter
) {
251 lttng_kvfree(counter
);
253 if (counter_transport
)
254 module_put(counter_transport
->owner
);
259 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
261 struct lttng_transport
*transport
= NULL
;
262 struct lttng_event_notifier_group
*event_notifier_group
;
263 const char *transport_name
= "relay-event-notifier";
264 size_t subbuf_size
= 4096; //TODO
265 size_t num_subbuf
= 16; //TODO
266 unsigned int switch_timer_interval
= 0;
267 unsigned int read_timer_interval
= 0;
270 mutex_lock(&sessions_mutex
);
272 transport
= lttng_transport_find(transport_name
);
274 printk(KERN_WARNING
"LTTng: transport %s not found\n",
278 if (!try_module_get(transport
->owner
)) {
279 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
284 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
286 if (!event_notifier_group
)
290 * Initialize the ring buffer used to store event notifier
293 event_notifier_group
->ops
= &transport
->ops
;
294 event_notifier_group
->chan
= transport
->ops
.channel_create(
295 transport_name
, event_notifier_group
, NULL
,
296 subbuf_size
, num_subbuf
, switch_timer_interval
,
297 read_timer_interval
);
298 if (!event_notifier_group
->chan
)
301 event_notifier_group
->transport
= transport
;
303 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
304 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
305 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
306 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
308 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
310 mutex_unlock(&sessions_mutex
);
312 return event_notifier_group
;
315 lttng_kvfree(event_notifier_group
);
318 module_put(transport
->owner
);
320 mutex_unlock(&sessions_mutex
);
324 void metadata_cache_destroy(struct kref
*kref
)
326 struct lttng_metadata_cache
*cache
=
327 container_of(kref
, struct lttng_metadata_cache
, refcount
);
332 void lttng_session_destroy(struct lttng_session
*session
)
334 struct lttng_channel
*chan
, *tmpchan
;
335 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
336 struct lttng_metadata_stream
*metadata_stream
;
337 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
340 mutex_lock(&sessions_mutex
);
341 WRITE_ONCE(session
->active
, 0);
342 list_for_each_entry(chan
, &session
->chan
, list
) {
343 ret
= lttng_syscalls_unregister_channel(chan
);
346 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
347 ret
= _lttng_event_unregister(event_recorder_priv
->pub
);
350 synchronize_trace(); /* Wait for in-flight events to complete */
351 list_for_each_entry(chan
, &session
->chan
, list
) {
352 ret
= lttng_syscalls_destroy_event(chan
);
355 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
356 &session
->enablers_head
, node
)
357 lttng_event_enabler_destroy(event_enabler
);
358 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->events
, node
)
359 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
360 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
361 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
362 _lttng_channel_destroy(chan
);
364 mutex_lock(&session
->metadata_cache
->lock
);
365 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
366 _lttng_metadata_channel_hangup(metadata_stream
);
367 mutex_unlock(&session
->metadata_cache
->lock
);
368 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
369 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
370 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
371 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
372 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
373 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
374 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
375 list_del(&session
->list
);
376 mutex_unlock(&sessions_mutex
);
377 lttng_kvfree(session
);
380 void lttng_event_notifier_group_destroy(
381 struct lttng_event_notifier_group
*event_notifier_group
)
383 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
384 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
387 if (!event_notifier_group
)
390 mutex_lock(&sessions_mutex
);
392 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
395 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
396 &event_notifier_group
->event_notifiers_head
, node
) {
397 ret
= _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
401 /* Wait for in-flight event notifier to complete */
404 irq_work_sync(&event_notifier_group
->wakeup_pending
);
406 kfree(event_notifier_group
->sc_filter
);
408 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
409 &event_notifier_group
->enablers_head
, node
)
410 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
412 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
413 &event_notifier_group
->event_notifiers_head
, node
)
414 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
416 if (event_notifier_group
->error_counter
) {
417 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
419 error_counter
->ops
->counter_destroy(error_counter
->counter
);
420 module_put(error_counter
->transport
->owner
);
421 lttng_kvfree(error_counter
);
422 event_notifier_group
->error_counter
= NULL
;
425 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
426 module_put(event_notifier_group
->transport
->owner
);
427 list_del(&event_notifier_group
->node
);
429 mutex_unlock(&sessions_mutex
);
430 lttng_kvfree(event_notifier_group
);
433 int lttng_session_statedump(struct lttng_session
*session
)
437 mutex_lock(&sessions_mutex
);
438 ret
= lttng_statedump_start(session
);
439 mutex_unlock(&sessions_mutex
);
443 int lttng_session_enable(struct lttng_session
*session
)
446 struct lttng_channel
*chan
;
448 mutex_lock(&sessions_mutex
);
449 if (session
->active
) {
454 /* Set transient enabler state to "enabled" */
457 /* We need to sync enablers with session before activation. */
458 lttng_session_sync_event_enablers(session
);
461 * Snapshot the number of events per channel to know the type of header
464 list_for_each_entry(chan
, &session
->chan
, list
) {
465 if (chan
->header_type
)
466 continue; /* don't change it if session stop/restart */
467 if (chan
->free_event_id
< 31)
468 chan
->header_type
= 1; /* compact */
470 chan
->header_type
= 2; /* large */
473 /* Clear each stream's quiescent state. */
474 list_for_each_entry(chan
, &session
->chan
, list
) {
475 if (chan
->channel_type
!= METADATA_CHANNEL
)
476 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
479 WRITE_ONCE(session
->active
, 1);
480 WRITE_ONCE(session
->been_active
, 1);
481 ret
= _lttng_session_metadata_statedump(session
);
483 WRITE_ONCE(session
->active
, 0);
486 ret
= lttng_statedump_start(session
);
488 WRITE_ONCE(session
->active
, 0);
490 mutex_unlock(&sessions_mutex
);
494 int lttng_session_disable(struct lttng_session
*session
)
497 struct lttng_channel
*chan
;
499 mutex_lock(&sessions_mutex
);
500 if (!session
->active
) {
504 WRITE_ONCE(session
->active
, 0);
506 /* Set transient enabler state to "disabled" */
508 lttng_session_sync_event_enablers(session
);
510 /* Set each stream's quiescent state. */
511 list_for_each_entry(chan
, &session
->chan
, list
) {
512 if (chan
->channel_type
!= METADATA_CHANNEL
)
513 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
516 mutex_unlock(&sessions_mutex
);
520 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
523 struct lttng_channel
*chan
;
524 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
525 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
526 struct lttng_metadata_stream
*stream
;
528 mutex_lock(&sessions_mutex
);
529 if (!session
->active
) {
534 mutex_lock(&cache
->lock
);
535 memset(cache
->data
, 0, cache
->cache_alloc
);
536 cache
->metadata_written
= 0;
538 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
539 stream
->metadata_out
= 0;
540 stream
->metadata_in
= 0;
542 mutex_unlock(&cache
->lock
);
544 session
->metadata_dumped
= 0;
545 list_for_each_entry(chan
, &session
->chan
, list
) {
546 chan
->metadata_dumped
= 0;
549 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
550 event_recorder_priv
->metadata_dumped
= 0;
553 ret
= _lttng_session_metadata_statedump(session
);
556 mutex_unlock(&sessions_mutex
);
560 int lttng_channel_enable(struct lttng_channel
*channel
)
564 mutex_lock(&sessions_mutex
);
565 if (channel
->channel_type
== METADATA_CHANNEL
) {
569 if (channel
->enabled
) {
573 /* Set transient enabler state to "enabled" */
575 lttng_session_sync_event_enablers(channel
->session
);
576 /* Set atomically the state to "enabled" */
577 WRITE_ONCE(channel
->enabled
, 1);
579 mutex_unlock(&sessions_mutex
);
583 int lttng_channel_disable(struct lttng_channel
*channel
)
587 mutex_lock(&sessions_mutex
);
588 if (channel
->channel_type
== METADATA_CHANNEL
) {
592 if (!channel
->enabled
) {
596 /* Set atomically the state to "disabled" */
597 WRITE_ONCE(channel
->enabled
, 0);
598 /* Set transient enabler state to "enabled" */
600 lttng_session_sync_event_enablers(channel
->session
);
602 mutex_unlock(&sessions_mutex
);
606 int lttng_event_enable(struct lttng_kernel_event_recorder
*event_recorder
)
608 struct lttng_kernel_event_common
*event
= &event_recorder
->parent
;
611 mutex_lock(&sessions_mutex
);
612 if (event_recorder
->chan
->channel_type
== METADATA_CHANNEL
) {
616 if (event
->enabled
) {
620 switch (event
->priv
->instrumentation
) {
621 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
622 case LTTNG_KERNEL_ABI_SYSCALL
:
626 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
627 case LTTNG_KERNEL_ABI_UPROBE
:
628 WRITE_ONCE(event
->enabled
, 1);
631 case LTTNG_KERNEL_ABI_KRETPROBE
:
632 ret
= lttng_kretprobes_event_enable_state(event_recorder
, 1);
635 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
636 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
642 mutex_unlock(&sessions_mutex
);
646 int lttng_event_disable(struct lttng_kernel_event_recorder
*event_recorder
)
648 struct lttng_kernel_event_common
*event
= &event_recorder
->parent
;
651 mutex_lock(&sessions_mutex
);
652 if (event_recorder
->chan
->channel_type
== METADATA_CHANNEL
) {
656 if (!event
->enabled
) {
660 switch (event
->priv
->instrumentation
) {
661 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
662 case LTTNG_KERNEL_ABI_SYSCALL
:
666 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
667 case LTTNG_KERNEL_ABI_UPROBE
:
668 WRITE_ONCE(event
->enabled
, 0);
671 case LTTNG_KERNEL_ABI_KRETPROBE
:
673 ret
= lttng_kretprobes_event_enable_state(event_recorder
, 0);
676 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
677 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
683 mutex_unlock(&sessions_mutex
);
687 int lttng_event_notifier_enable(struct lttng_kernel_event_notifier
*event_notifier
)
689 struct lttng_kernel_event_common
*event
= &event_notifier
->parent
;
692 mutex_lock(&sessions_mutex
);
693 if (event
->enabled
) {
697 switch (event
->priv
->instrumentation
) {
698 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
699 case LTTNG_KERNEL_ABI_SYSCALL
:
703 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
704 case LTTNG_KERNEL_ABI_UPROBE
:
705 WRITE_ONCE(event
->enabled
, 1);
708 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
709 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
710 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
716 mutex_unlock(&sessions_mutex
);
720 int lttng_event_notifier_disable(struct lttng_kernel_event_notifier
*event_notifier
)
722 struct lttng_kernel_event_common
*event
= &event_notifier
->parent
;
725 mutex_lock(&sessions_mutex
);
726 if (!event
->enabled
) {
730 switch (event
->priv
->instrumentation
) {
731 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
732 case LTTNG_KERNEL_ABI_SYSCALL
:
736 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
737 case LTTNG_KERNEL_ABI_UPROBE
:
738 WRITE_ONCE(event
->enabled
, 0);
741 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
742 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
743 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
749 mutex_unlock(&sessions_mutex
);
753 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
754 const char *transport_name
,
756 size_t subbuf_size
, size_t num_subbuf
,
757 unsigned int switch_timer_interval
,
758 unsigned int read_timer_interval
,
759 enum channel_type channel_type
)
761 struct lttng_channel
*chan
;
762 struct lttng_transport
*transport
= NULL
;
764 mutex_lock(&sessions_mutex
);
765 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
766 goto active
; /* Refuse to add channel to active session */
767 transport
= lttng_transport_find(transport_name
);
769 printk(KERN_WARNING
"LTTng: transport %s not found\n",
773 if (!try_module_get(transport
->owner
)) {
774 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
777 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
780 chan
->session
= session
;
781 chan
->id
= session
->free_chan_id
++;
782 chan
->ops
= &transport
->ops
;
784 * Note: the channel creation op already writes into the packet
785 * headers. Therefore the "chan" information used as input
786 * should be already accessible.
788 chan
->chan
= transport
->ops
.channel_create(transport_name
,
789 chan
, buf_addr
, subbuf_size
, num_subbuf
,
790 switch_timer_interval
, read_timer_interval
);
795 chan
->transport
= transport
;
796 chan
->channel_type
= channel_type
;
797 list_add(&chan
->list
, &session
->chan
);
798 mutex_unlock(&sessions_mutex
);
805 module_put(transport
->owner
);
808 mutex_unlock(&sessions_mutex
);
813 * Only used internally at session destruction for per-cpu channels, and
814 * when metadata channel is released.
815 * Needs to be called with sessions mutex held.
818 void _lttng_channel_destroy(struct lttng_channel
*chan
)
820 chan
->ops
->channel_destroy(chan
->chan
);
821 module_put(chan
->transport
->owner
);
822 list_del(&chan
->list
);
823 lttng_kernel_destroy_context(chan
->ctx
);
827 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
829 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
831 /* Protect the metadata cache with the sessions_mutex. */
832 mutex_lock(&sessions_mutex
);
833 _lttng_channel_destroy(chan
);
834 mutex_unlock(&sessions_mutex
);
836 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
839 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
841 stream
->finalized
= 1;
842 wake_up_interruptible(&stream
->read_wait
);
847 * Supports event creation while tracing session is active.
848 * Needs to be called with sessions mutex held.
850 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_channel
*chan
,
851 struct lttng_kernel_abi_event
*event_param
,
852 const struct lttng_kernel_event_desc
*event_desc
,
853 enum lttng_kernel_abi_instrumentation itype
)
855 struct lttng_session
*session
= chan
->session
;
856 struct lttng_kernel_event_recorder
*event_recorder
;
857 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
858 const char *event_name
;
859 struct hlist_head
*head
;
862 if (chan
->free_event_id
== -1U) {
868 case LTTNG_KERNEL_ABI_TRACEPOINT
:
869 event_name
= event_desc
->event_name
;
872 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
873 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
874 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
875 case LTTNG_KERNEL_ABI_SYSCALL
:
876 event_name
= event_param
->name
;
879 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
880 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
887 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
888 LTTNG_EVENT_HT_SIZE
, event_name
);
889 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
890 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
891 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
892 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
893 && chan
== event_recorder_priv
->pub
->chan
) {
899 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
900 if (!event_recorder
) {
904 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
905 if (!event_recorder_priv
) {
907 goto cache_private_error
;
909 event_recorder_priv
->pub
= event_recorder
;
910 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
911 event_recorder
->priv
= event_recorder_priv
;
912 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
913 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
915 event_recorder
->chan
= chan
;
916 event_recorder
->priv
->id
= chan
->free_event_id
++;
917 event_recorder
->priv
->parent
.instrumentation
= itype
;
918 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
919 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
922 case LTTNG_KERNEL_ABI_TRACEPOINT
:
923 /* Event will be enabled by enabler sync. */
924 event_recorder
->parent
.enabled
= 0;
925 event_recorder
->priv
->parent
.registered
= 0;
926 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
927 if (!event_recorder
->priv
->parent
.desc
) {
931 /* Populate lttng_event structure before event registration. */
935 case LTTNG_KERNEL_ABI_KPROBE
:
937 * Needs to be explicitly enabled after creation, since
938 * we may want to apply filters.
940 event_recorder
->parent
.enabled
= 0;
941 event_recorder
->priv
->parent
.registered
= 1;
943 * Populate lttng_event structure before event
947 ret
= lttng_kprobes_register_event(event_name
,
948 event_param
->u
.kprobe
.symbol_name
,
949 event_param
->u
.kprobe
.offset
,
950 event_param
->u
.kprobe
.addr
,
956 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
960 case LTTNG_KERNEL_ABI_KRETPROBE
:
962 struct lttng_kernel_event_recorder
*event_recorder_return
;
963 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
965 /* kretprobe defines 2 events */
967 * Needs to be explicitly enabled after creation, since
968 * we may want to apply filters.
970 event_recorder
->parent
.enabled
= 0;
971 event_recorder
->priv
->parent
.registered
= 1;
973 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
974 if (!event_recorder_return
) {
978 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
979 if (!event_recorder_return_priv
) {
980 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
984 event_recorder_return_priv
->pub
= event_recorder_return
;
985 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
986 event_recorder_return
->priv
= event_recorder_return_priv
;
987 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
988 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
990 event_recorder_return
->chan
= chan
;
991 event_recorder_return
->priv
->id
= chan
->free_event_id
++;
992 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
993 event_recorder_return
->parent
.enabled
= 0;
994 event_recorder_return
->priv
->parent
.registered
= 1;
995 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
996 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
998 * Populate lttng_event structure before kretprobe registration.
1001 ret
= lttng_kretprobes_register(event_name
,
1002 event_param
->u
.kretprobe
.symbol_name
,
1003 event_param
->u
.kretprobe
.offset
,
1004 event_param
->u
.kretprobe
.addr
,
1005 event_recorder
, event_recorder_return
);
1007 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1008 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1010 goto register_error
;
1012 /* Take 2 refs on the module: one per event. */
1013 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1015 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1017 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
1018 event_recorder_return
);
1019 WARN_ON_ONCE(ret
> 0);
1021 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1022 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1023 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1024 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1025 goto statedump_error
;
1027 list_add(&event_recorder_return
->priv
->node
, &chan
->session
->events
);
1031 case LTTNG_KERNEL_ABI_SYSCALL
:
1033 * Needs to be explicitly enabled after creation, since
1034 * we may want to apply filters.
1036 event_recorder
->parent
.enabled
= 0;
1037 event_recorder
->priv
->parent
.registered
= 0;
1038 event_recorder
->priv
->parent
.desc
= event_desc
;
1039 switch (event_param
->u
.syscall
.entryexit
) {
1040 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1042 goto register_error
;
1043 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1044 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1046 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1047 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1050 switch (event_param
->u
.syscall
.abi
) {
1051 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1053 goto register_error
;
1054 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1055 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1057 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1058 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1061 if (!event_recorder
->priv
->parent
.desc
) {
1063 goto register_error
;
1067 case LTTNG_KERNEL_ABI_UPROBE
:
1069 * Needs to be explicitly enabled after creation, since
1070 * we may want to apply filters.
1072 event_recorder
->parent
.enabled
= 0;
1073 event_recorder
->priv
->parent
.registered
= 1;
1076 * Populate lttng_event structure before event
1081 ret
= lttng_uprobes_register_event(event_param
->name
,
1082 event_param
->u
.uprobe
.fd
,
1085 goto register_error
;
1086 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1090 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1091 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1095 goto register_error
;
1097 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event_recorder
);
1098 WARN_ON_ONCE(ret
> 0);
1100 goto statedump_error
;
1102 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1103 list_add(&event_recorder
->priv
->node
, &chan
->session
->events
);
1104 return event_recorder
;
1107 /* If a statedump error occurs, events will not be readable. */
1109 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1110 cache_private_error
:
1111 kmem_cache_free(event_recorder_cache
, event_recorder
);
1116 return ERR_PTR(ret
);
1119 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1120 const struct lttng_kernel_event_desc
*event_desc
,
1121 uint64_t token
, uint64_t error_counter_index
,
1122 struct lttng_event_notifier_group
*event_notifier_group
,
1123 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1124 enum lttng_kernel_abi_instrumentation itype
)
1126 struct lttng_kernel_event_notifier
*event_notifier
;
1127 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1128 struct lttng_counter
*error_counter
;
1129 const char *event_name
;
1130 struct hlist_head
*head
;
1134 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1135 event_name
= event_desc
->event_name
;
1138 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1139 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1140 case LTTNG_KERNEL_ABI_SYSCALL
:
1141 event_name
= event_notifier_param
->event
.name
;
1144 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1145 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1146 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1153 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1154 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1155 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1156 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1157 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1158 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1159 && event_notifier_group
== event_notifier_priv
->group
1160 && token
== event_notifier_priv
->parent
.user_token
) {
1166 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1167 if (!event_notifier
) {
1171 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1172 if (!event_notifier_priv
) {
1174 goto cache_private_error
;
1176 event_notifier_priv
->pub
= event_notifier
;
1177 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1178 event_notifier
->priv
= event_notifier_priv
;
1179 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1180 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1182 event_notifier
->priv
->group
= event_notifier_group
;
1183 event_notifier
->priv
->parent
.user_token
= token
;
1184 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1185 event_notifier
->priv
->num_captures
= 0;
1186 event_notifier
->priv
->parent
.instrumentation
= itype
;
1187 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1188 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1189 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1190 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1193 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1194 /* Event will be enabled by enabler sync. */
1195 event_notifier
->parent
.enabled
= 0;
1196 event_notifier
->priv
->parent
.registered
= 0;
1197 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1198 if (!event_notifier
->priv
->parent
.desc
) {
1200 goto register_error
;
1202 /* Populate lttng_event_notifier structure before event registration. */
1206 case LTTNG_KERNEL_ABI_KPROBE
:
1208 * Needs to be explicitly enabled after creation, since
1209 * we may want to apply filters.
1211 event_notifier
->parent
.enabled
= 0;
1212 event_notifier
->priv
->parent
.registered
= 1;
1214 * Populate lttng_event_notifier structure before event
1218 ret
= lttng_kprobes_register_event_notifier(
1219 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1220 event_notifier_param
->event
.u
.kprobe
.offset
,
1221 event_notifier_param
->event
.u
.kprobe
.addr
,
1225 goto register_error
;
1227 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1231 case LTTNG_KERNEL_ABI_SYSCALL
:
1233 * Needs to be explicitly enabled after creation, since
1234 * we may want to apply filters.
1236 event_notifier
->parent
.enabled
= 0;
1237 event_notifier
->priv
->parent
.registered
= 0;
1238 event_notifier
->priv
->parent
.desc
= event_desc
;
1239 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1240 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1242 goto register_error
;
1243 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1244 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1246 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1247 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1250 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1251 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1253 goto register_error
;
1254 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1255 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1257 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1258 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1262 if (!event_notifier
->priv
->parent
.desc
) {
1264 goto register_error
;
1268 case LTTNG_KERNEL_ABI_UPROBE
:
1270 * Needs to be explicitly enabled after creation, since
1271 * we may want to apply filters.
1273 event_notifier
->parent
.enabled
= 0;
1274 event_notifier
->priv
->parent
.registered
= 1;
1277 * Populate lttng_event_notifier structure before
1278 * event_notifier registration.
1282 ret
= lttng_uprobes_register_event_notifier(
1283 event_notifier_param
->event
.name
,
1284 event_notifier_param
->event
.u
.uprobe
.fd
,
1287 goto register_error
;
1288 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1292 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1293 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1294 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1298 goto register_error
;
1301 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1302 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1305 * Clear the error counter bucket. The sessiond keeps track of which
1306 * bucket is currently in use. We trust it. The session lock
1307 * synchronizes against concurrent creation of the error
1310 error_counter
= event_notifier_group
->error_counter
;
1311 if (error_counter
) {
1312 size_t dimension_index
[1];
1315 * Check that the index is within the boundary of the counter.
1317 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1318 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1319 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1321 goto register_error
;
1324 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1325 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1327 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1328 event_notifier
->priv
->error_counter_index
);
1329 goto register_error
;
1333 return event_notifier
;
1336 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1337 cache_private_error
:
1338 kmem_cache_free(event_notifier_cache
, event_notifier
);
1342 return ERR_PTR(ret
);
1345 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1346 const size_t *dim_indexes
, int32_t cpu
,
1347 int64_t *val
, bool *overflow
, bool *underflow
)
1349 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1350 cpu
, val
, overflow
, underflow
);
1353 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1354 const size_t *dim_indexes
, int64_t *val
,
1355 bool *overflow
, bool *underflow
)
1357 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1358 val
, overflow
, underflow
);
1361 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1362 const size_t *dim_indexes
)
1364 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1367 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_channel
*chan
,
1368 struct lttng_kernel_abi_event
*event_param
,
1369 const struct lttng_kernel_event_desc
*event_desc
,
1370 enum lttng_kernel_abi_instrumentation itype
)
1372 struct lttng_kernel_event_recorder
*event
;
1374 mutex_lock(&sessions_mutex
);
1375 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1376 mutex_unlock(&sessions_mutex
);
1380 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1381 const struct lttng_kernel_event_desc
*event_desc
,
1382 uint64_t id
, uint64_t error_counter_index
,
1383 struct lttng_event_notifier_group
*event_notifier_group
,
1384 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1385 enum lttng_kernel_abi_instrumentation itype
)
1387 struct lttng_kernel_event_notifier
*event_notifier
;
1389 mutex_lock(&sessions_mutex
);
1390 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1391 error_counter_index
, event_notifier_group
,
1392 event_notifier_param
, itype
);
1393 mutex_unlock(&sessions_mutex
);
1394 return event_notifier
;
1397 /* Only used for tracepoints for now. */
1399 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1401 const struct lttng_kernel_event_desc
*desc
;
1404 if (event_recorder
->priv
->parent
.registered
)
1407 desc
= event_recorder
->priv
->parent
.desc
;
1408 switch (event_recorder
->priv
->parent
.instrumentation
) {
1409 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1410 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1411 desc
->probe_callback
,
1415 case LTTNG_KERNEL_ABI_SYSCALL
:
1416 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1419 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1420 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1421 case LTTNG_KERNEL_ABI_KRETPROBE
:
1425 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1426 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1431 event_recorder
->priv
->parent
.registered
= 1;
1435 * Only used internally at session destruction.
1437 int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1439 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1440 const struct lttng_kernel_event_desc
*desc
;
1443 if (!event_priv
->registered
)
1446 desc
= event_priv
->desc
;
1447 switch (event_priv
->instrumentation
) {
1448 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1449 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1450 event_priv
->desc
->probe_callback
,
1454 case LTTNG_KERNEL_ABI_KPROBE
:
1455 lttng_kprobes_unregister_event(event_recorder
);
1459 case LTTNG_KERNEL_ABI_KRETPROBE
:
1460 lttng_kretprobes_unregister(event_recorder
);
1464 case LTTNG_KERNEL_ABI_SYSCALL
:
1465 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1468 case LTTNG_KERNEL_ABI_NOOP
:
1472 case LTTNG_KERNEL_ABI_UPROBE
:
1473 lttng_uprobes_unregister_event(event_recorder
);
1477 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1482 event_priv
->registered
= 0;
1486 /* Only used for tracepoints for now. */
1488 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1490 const struct lttng_kernel_event_desc
*desc
;
1493 if (event_notifier
->priv
->parent
.registered
)
1496 desc
= event_notifier
->priv
->parent
.desc
;
1497 switch (event_notifier
->priv
->parent
.instrumentation
) {
1498 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1499 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1500 desc
->event_notifier_callback
,
1504 case LTTNG_KERNEL_ABI_SYSCALL
:
1505 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1508 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1509 case LTTNG_KERNEL_ABI_UPROBE
:
1513 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1514 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1515 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1520 event_notifier
->priv
->parent
.registered
= 1;
1524 int _lttng_event_notifier_unregister(
1525 struct lttng_kernel_event_notifier
*event_notifier
)
1527 const struct lttng_kernel_event_desc
*desc
;
1530 if (!event_notifier
->priv
->parent
.registered
)
1533 desc
= event_notifier
->priv
->parent
.desc
;
1534 switch (event_notifier
->priv
->parent
.instrumentation
) {
1535 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1536 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1537 event_notifier
->priv
->parent
.desc
->event_notifier_callback
,
1541 case LTTNG_KERNEL_ABI_KPROBE
:
1542 lttng_kprobes_unregister_event_notifier(event_notifier
);
1546 case LTTNG_KERNEL_ABI_UPROBE
:
1547 lttng_uprobes_unregister_event_notifier(event_notifier
);
1551 case LTTNG_KERNEL_ABI_SYSCALL
:
1552 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1555 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1556 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1557 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1562 event_notifier
->priv
->parent
.registered
= 0;
1567 * Only used internally at session destruction.
1570 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1572 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1573 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1575 lttng_free_event_filter_runtime(event
);
1576 /* Free event enabler refs */
1577 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1578 &event_priv
->enablers_ref_head
, node
)
1581 switch (event
->type
) {
1582 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1584 struct lttng_kernel_event_recorder
*event_recorder
=
1585 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1587 switch (event_priv
->instrumentation
) {
1588 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1589 lttng_event_desc_put(event_priv
->desc
);
1592 case LTTNG_KERNEL_ABI_KPROBE
:
1593 module_put(event_priv
->desc
->owner
);
1594 lttng_kprobes_destroy_event_private(event_recorder
);
1597 case LTTNG_KERNEL_ABI_KRETPROBE
:
1598 module_put(event_priv
->desc
->owner
);
1599 lttng_kretprobes_destroy_private(event_recorder
);
1602 case LTTNG_KERNEL_ABI_SYSCALL
:
1605 case LTTNG_KERNEL_ABI_UPROBE
:
1606 module_put(event_priv
->desc
->owner
);
1607 lttng_uprobes_destroy_event_private(event_recorder
);
1610 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1611 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1615 list_del(&event_recorder
->priv
->node
);
1616 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1617 kmem_cache_free(event_recorder_cache
, event_recorder
);
1620 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1622 struct lttng_kernel_event_notifier
*event_notifier
=
1623 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1625 switch (event_notifier
->priv
->parent
.instrumentation
) {
1626 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1627 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1630 case LTTNG_KERNEL_ABI_KPROBE
:
1631 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1632 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1635 case LTTNG_KERNEL_ABI_SYSCALL
:
1638 case LTTNG_KERNEL_ABI_UPROBE
:
1639 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1640 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1643 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1644 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1645 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1649 list_del(&event_notifier
->priv
->node
);
1650 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1651 kmem_cache_free(event_notifier_cache
, event_notifier
);
1659 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1660 enum tracker_type tracker_type
)
1662 switch (tracker_type
) {
1664 return &session
->pid_tracker
;
1666 return &session
->vpid_tracker
;
1668 return &session
->uid_tracker
;
1670 return &session
->vuid_tracker
;
1672 return &session
->gid_tracker
;
1674 return &session
->vgid_tracker
;
1681 int lttng_session_track_id(struct lttng_session
*session
,
1682 enum tracker_type tracker_type
, int id
)
1684 struct lttng_id_tracker
*tracker
;
1687 tracker
= get_tracker(session
, tracker_type
);
1692 mutex_lock(&sessions_mutex
);
1694 /* track all ids: destroy tracker. */
1695 lttng_id_tracker_destroy(tracker
, true);
1698 ret
= lttng_id_tracker_add(tracker
, id
);
1700 mutex_unlock(&sessions_mutex
);
1704 int lttng_session_untrack_id(struct lttng_session
*session
,
1705 enum tracker_type tracker_type
, int id
)
1707 struct lttng_id_tracker
*tracker
;
1710 tracker
= get_tracker(session
, tracker_type
);
1715 mutex_lock(&sessions_mutex
);
1717 /* untrack all ids: replace by empty tracker. */
1718 ret
= lttng_id_tracker_empty_set(tracker
);
1720 ret
= lttng_id_tracker_del(tracker
, id
);
1722 mutex_unlock(&sessions_mutex
);
1727 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1729 struct lttng_id_tracker
*id_tracker
= m
->private;
1730 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1731 struct lttng_id_hash_node
*e
;
1734 mutex_lock(&sessions_mutex
);
1736 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1737 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1739 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1745 /* ID tracker disabled. */
1746 if (iter
>= *pos
&& iter
== 0) {
1747 return id_tracker_p
; /* empty tracker */
1755 /* Called with sessions_mutex held. */
1757 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1759 struct lttng_id_tracker
*id_tracker
= m
->private;
1760 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1761 struct lttng_id_hash_node
*e
;
1766 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1767 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1769 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1770 if (iter
++ >= *ppos
)
1775 /* ID tracker disabled. */
1776 if (iter
>= *ppos
&& iter
== 0)
1777 return p
; /* empty tracker */
1786 void id_list_stop(struct seq_file
*m
, void *p
)
1788 mutex_unlock(&sessions_mutex
);
1792 int id_list_show(struct seq_file
*m
, void *p
)
1794 struct lttng_id_tracker
*id_tracker
= m
->private;
1795 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1798 if (p
== id_tracker_p
) {
1799 /* Tracker disabled. */
1802 const struct lttng_id_hash_node
*e
= p
;
1804 id
= lttng_id_tracker_get_node_id(e
);
1806 switch (id_tracker
->tracker_type
) {
1808 seq_printf(m
, "process { pid = %d; };\n", id
);
1811 seq_printf(m
, "process { vpid = %d; };\n", id
);
1814 seq_printf(m
, "user { uid = %d; };\n", id
);
1817 seq_printf(m
, "user { vuid = %d; };\n", id
);
1820 seq_printf(m
, "group { gid = %d; };\n", id
);
1823 seq_printf(m
, "group { vgid = %d; };\n", id
);
1826 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1832 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1833 .start
= id_list_start
,
1834 .next
= id_list_next
,
1835 .stop
= id_list_stop
,
1836 .show
= id_list_show
,
1840 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1842 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1846 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1848 struct seq_file
*m
= file
->private_data
;
1849 struct lttng_id_tracker
*id_tracker
= m
->private;
1852 WARN_ON_ONCE(!id_tracker
);
1853 ret
= seq_release(inode
, file
);
1855 fput(id_tracker
->session
->file
);
1859 const struct file_operations lttng_tracker_ids_list_fops
= {
1860 .owner
= THIS_MODULE
,
1861 .open
= lttng_tracker_ids_list_open
,
1863 .llseek
= seq_lseek
,
1864 .release
= lttng_tracker_ids_list_release
,
1867 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1868 enum tracker_type tracker_type
)
1870 struct file
*tracker_ids_list_file
;
1874 file_fd
= lttng_get_unused_fd();
1880 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1881 <tng_tracker_ids_list_fops
,
1883 if (IS_ERR(tracker_ids_list_file
)) {
1884 ret
= PTR_ERR(tracker_ids_list_file
);
1887 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1889 goto refcount_error
;
1891 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1894 m
= tracker_ids_list_file
->private_data
;
1896 m
->private = get_tracker(session
, tracker_type
);
1897 BUG_ON(!m
->private);
1898 fd_install(file_fd
, tracker_ids_list_file
);
1903 atomic_long_dec(&session
->file
->f_count
);
1905 fput(tracker_ids_list_file
);
1907 put_unused_fd(file_fd
);
1913 * Enabler management.
1916 int lttng_match_enabler_star_glob(const char *desc_name
,
1917 const char *pattern
)
1919 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1920 desc_name
, LTTNG_SIZE_MAX
))
1926 int lttng_match_enabler_name(const char *desc_name
,
1929 if (strcmp(desc_name
, name
))
1934 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1935 struct lttng_enabler
*enabler
)
1937 const char *desc_name
, *enabler_name
;
1938 bool compat
= false, entry
= false;
1940 enabler_name
= enabler
->event_param
.name
;
1941 switch (enabler
->event_param
.instrumentation
) {
1942 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1943 desc_name
= desc
->event_name
;
1944 switch (enabler
->format_type
) {
1945 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1946 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1947 case LTTNG_ENABLER_FORMAT_NAME
:
1948 return lttng_match_enabler_name(desc_name
, enabler_name
);
1954 case LTTNG_KERNEL_ABI_SYSCALL
:
1955 desc_name
= desc
->event_name
;
1956 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1957 desc_name
+= strlen("compat_");
1960 if (!strncmp(desc_name
, "syscall_exit_",
1961 strlen("syscall_exit_"))) {
1962 desc_name
+= strlen("syscall_exit_");
1963 } else if (!strncmp(desc_name
, "syscall_entry_",
1964 strlen("syscall_entry_"))) {
1965 desc_name
+= strlen("syscall_entry_");
1971 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1972 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1974 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1978 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1985 switch (enabler
->event_param
.u
.syscall
.abi
) {
1986 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1988 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1992 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1999 switch (enabler
->event_param
.u
.syscall
.match
) {
2000 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2001 switch (enabler
->format_type
) {
2002 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2003 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2004 case LTTNG_ENABLER_FORMAT_NAME
:
2005 return lttng_match_enabler_name(desc_name
, enabler_name
);
2010 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2011 return -EINVAL
; /* Not implemented. */
2024 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2025 struct lttng_kernel_event_recorder
*event_recorder
)
2027 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2030 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2032 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2033 && event_recorder
->chan
== event_enabler
->chan
)
2040 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2041 struct lttng_kernel_event_notifier
*event_notifier
)
2043 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2044 event_notifier_enabler
);
2046 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2048 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2049 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2050 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2057 struct lttng_enabler_ref
*lttng_enabler_ref(
2058 struct list_head
*enablers_ref_list
,
2059 struct lttng_enabler
*enabler
)
2061 struct lttng_enabler_ref
*enabler_ref
;
2063 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2064 if (enabler_ref
->ref
== enabler
)
2071 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2073 struct lttng_session
*session
= event_enabler
->chan
->session
;
2074 struct lttng_kernel_probe_desc
*probe_desc
;
2075 const struct lttng_kernel_event_desc
*desc
;
2077 struct list_head
*probe_list
;
2079 probe_list
= lttng_get_probe_list_head();
2081 * For each probe event, if we find that a probe event matches
2082 * our enabler, create an associated lttng_event if not
2085 list_for_each_entry(probe_desc
, probe_list
, head
) {
2086 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2088 struct hlist_head
*head
;
2089 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2090 struct lttng_kernel_event_recorder
*event_recorder
;
2092 desc
= probe_desc
->event_desc
[i
];
2093 if (!lttng_desc_match_enabler(desc
,
2094 lttng_event_enabler_as_enabler(event_enabler
)))
2098 * Check if already created.
2100 head
= utils_borrow_hash_table_bucket(
2101 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2103 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2104 if (event_recorder_private
->parent
.desc
== desc
2105 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2112 * We need to create an event for this
2115 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2116 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2117 if (!event_recorder
) {
2118 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2119 probe_desc
->event_desc
[i
]->event_name
);
2126 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2128 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2129 struct lttng_kernel_probe_desc
*probe_desc
;
2130 const struct lttng_kernel_event_desc
*desc
;
2132 struct list_head
*probe_list
;
2134 probe_list
= lttng_get_probe_list_head();
2136 * For each probe event, if we find that a probe event matches
2137 * our enabler, create an associated lttng_event_notifier if not
2140 list_for_each_entry(probe_desc
, probe_list
, head
) {
2141 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2143 struct hlist_head
*head
;
2144 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2145 struct lttng_kernel_event_notifier
*event_notifier
;
2147 desc
= probe_desc
->event_desc
[i
];
2148 if (!lttng_desc_match_enabler(desc
,
2149 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2153 * Check if already created.
2155 head
= utils_borrow_hash_table_bucket(
2156 event_notifier_group
->event_notifiers_ht
.table
,
2157 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2158 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2159 if (event_notifier_priv
->parent
.desc
== desc
2160 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2167 * We need to create a event_notifier for this event probe.
2169 event_notifier
= _lttng_event_notifier_create(desc
,
2170 event_notifier_enabler
->base
.user_token
,
2171 event_notifier_enabler
->error_counter_index
,
2172 event_notifier_group
, NULL
,
2173 LTTNG_KERNEL_ABI_TRACEPOINT
);
2174 if (IS_ERR(event_notifier
)) {
2175 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2176 probe_desc
->event_desc
[i
]->event_name
);
2183 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2187 ret
= lttng_syscalls_register_event(event_enabler
);
2192 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2196 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2198 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2203 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2204 * tracepoint probes.
2205 * Should be called with sessions mutex held.
2208 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2210 switch (event_enabler
->base
.event_param
.instrumentation
) {
2211 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2212 lttng_create_tracepoint_event_if_missing(event_enabler
);
2215 case LTTNG_KERNEL_ABI_SYSCALL
:
2216 lttng_create_syscall_event_if_missing(event_enabler
);
2226 * Create events associated with an event_enabler (if not already present),
2227 * and add backward reference from the event to the enabler.
2228 * Should be called with sessions mutex held.
2231 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2233 struct lttng_channel
*chan
= event_enabler
->chan
;
2234 struct lttng_session
*session
= event_enabler
->chan
->session
;
2235 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2236 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2238 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2239 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2240 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2241 !strcmp(base_enabler
->event_param
.name
, "*")) {
2242 int enabled
= base_enabler
->enabled
;
2243 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2245 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2246 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2248 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2249 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2252 /* First ensure that probe events are created for this enabler. */
2253 lttng_create_event_if_missing(event_enabler
);
2255 /* For each event matching event_enabler in session event list. */
2256 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
2257 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2258 struct lttng_enabler_ref
*enabler_ref
;
2260 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2262 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2263 lttng_event_enabler_as_enabler(event_enabler
));
2266 * If no backward ref, create it.
2267 * Add backward ref from event to event_enabler.
2269 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2272 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2273 list_add(&enabler_ref
->node
,
2274 &event_recorder_priv
->parent
.enablers_ref_head
);
2278 * Link filter bytecodes if not linked yet.
2280 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2282 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2283 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2289 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2290 * tracepoint probes.
2291 * Should be called with sessions mutex held.
2294 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2296 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2297 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2298 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2301 case LTTNG_KERNEL_ABI_SYSCALL
:
2302 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2312 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2315 int lttng_event_notifier_enabler_ref_event_notifiers(
2316 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2318 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2319 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2320 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2322 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2323 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2324 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2325 !strcmp(base_enabler
->event_param
.name
, "*")) {
2327 int enabled
= base_enabler
->enabled
;
2328 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2330 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2331 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2333 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2334 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2338 /* First ensure that probe event_notifiers are created for this enabler. */
2339 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2341 /* Link the created event_notifier with its associated enabler. */
2342 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2343 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2344 struct lttng_enabler_ref
*enabler_ref
;
2346 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2349 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2350 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2353 * If no backward ref, create it.
2354 * Add backward ref from event_notifier to enabler.
2356 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2360 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2361 event_notifier_enabler
);
2362 list_add(&enabler_ref
->node
,
2363 &event_notifier_priv
->parent
.enablers_ref_head
);
2367 * Link filter bytecodes if not linked yet.
2369 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2370 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2371 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2373 /* Link capture bytecodes if not linked yet. */
2374 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2375 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2376 &event_notifier_enabler
->capture_bytecode_head
);
2378 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2384 * Called at module load: connect the probe on all enablers matching
2386 * Called with sessions lock held.
2388 int lttng_fix_pending_events(void)
2390 struct lttng_session
*session
;
2392 list_for_each_entry(session
, &sessions
, list
)
2393 lttng_session_lazy_sync_event_enablers(session
);
2397 static bool lttng_event_notifier_group_has_active_event_notifiers(
2398 struct lttng_event_notifier_group
*event_notifier_group
)
2400 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2402 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2404 if (event_notifier_enabler
->base
.enabled
)
2410 bool lttng_event_notifier_active(void)
2412 struct lttng_event_notifier_group
*event_notifier_group
;
2414 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2415 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2421 int lttng_fix_pending_event_notifiers(void)
2423 struct lttng_event_notifier_group
*event_notifier_group
;
2425 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2426 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2430 struct lttng_event_enabler
*lttng_event_enabler_create(
2431 enum lttng_enabler_format_type format_type
,
2432 struct lttng_kernel_abi_event
*event_param
,
2433 struct lttng_channel
*chan
)
2435 struct lttng_event_enabler
*event_enabler
;
2437 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2440 event_enabler
->base
.format_type
= format_type
;
2441 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2442 memcpy(&event_enabler
->base
.event_param
, event_param
,
2443 sizeof(event_enabler
->base
.event_param
));
2444 event_enabler
->chan
= chan
;
2446 event_enabler
->base
.enabled
= 0;
2447 mutex_lock(&sessions_mutex
);
2448 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2449 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2450 mutex_unlock(&sessions_mutex
);
2451 return event_enabler
;
2454 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2456 mutex_lock(&sessions_mutex
);
2457 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2458 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2459 mutex_unlock(&sessions_mutex
);
2463 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2465 mutex_lock(&sessions_mutex
);
2466 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2467 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2468 mutex_unlock(&sessions_mutex
);
2473 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2474 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2476 struct lttng_bytecode_node
*bytecode_node
;
2477 uint32_t bytecode_len
;
2480 ret
= get_user(bytecode_len
, &bytecode
->len
);
2483 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2487 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2488 sizeof(*bytecode
) + bytecode_len
);
2492 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2493 bytecode_node
->enabler
= enabler
;
2494 /* Enforce length based on allocated size */
2495 bytecode_node
->bc
.len
= bytecode_len
;
2496 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2501 lttng_kvfree(bytecode_node
);
2505 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2506 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2509 ret
= lttng_enabler_attach_filter_bytecode(
2510 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2514 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2521 int lttng_event_add_callsite(struct lttng_kernel_event_recorder
*event_recorder
,
2522 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2525 switch (event_recorder
->priv
->parent
.instrumentation
) {
2526 case LTTNG_KERNEL_ABI_UPROBE
:
2527 return lttng_uprobes_event_add_callsite(event_recorder
, callsite
);
2534 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2536 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2538 /* Destroy filter bytecode */
2539 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2540 &enabler
->filter_bytecode_head
, node
) {
2541 lttng_kvfree(filter_node
);
2546 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2548 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2550 list_del(&event_enabler
->node
);
2551 kfree(event_enabler
);
2554 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2555 struct lttng_event_notifier_group
*event_notifier_group
,
2556 enum lttng_enabler_format_type format_type
,
2557 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2559 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2561 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2562 if (!event_notifier_enabler
)
2565 event_notifier_enabler
->base
.format_type
= format_type
;
2566 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2567 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2569 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2570 event_notifier_enabler
->num_captures
= 0;
2572 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2573 sizeof(event_notifier_enabler
->base
.event_param
));
2575 event_notifier_enabler
->base
.enabled
= 0;
2576 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2577 event_notifier_enabler
->group
= event_notifier_group
;
2579 mutex_lock(&sessions_mutex
);
2580 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2581 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2583 mutex_unlock(&sessions_mutex
);
2585 return event_notifier_enabler
;
2588 int lttng_event_notifier_enabler_enable(
2589 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2591 mutex_lock(&sessions_mutex
);
2592 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2593 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2594 mutex_unlock(&sessions_mutex
);
2598 int lttng_event_notifier_enabler_disable(
2599 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2601 mutex_lock(&sessions_mutex
);
2602 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2603 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2604 mutex_unlock(&sessions_mutex
);
2608 int lttng_event_notifier_enabler_attach_filter_bytecode(
2609 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2610 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2614 ret
= lttng_enabler_attach_filter_bytecode(
2615 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2620 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2627 int lttng_event_notifier_enabler_attach_capture_bytecode(
2628 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2629 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2631 struct lttng_bytecode_node
*bytecode_node
;
2632 struct lttng_enabler
*enabler
=
2633 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2634 uint32_t bytecode_len
;
2637 ret
= get_user(bytecode_len
, &bytecode
->len
);
2641 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2646 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2647 sizeof(*bytecode
) + bytecode_len
);
2651 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2652 bytecode_node
->enabler
= enabler
;
2654 /* Enforce length based on allocated size */
2655 bytecode_node
->bc
.len
= bytecode_len
;
2656 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2658 event_notifier_enabler
->num_captures
++;
2660 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2664 lttng_kvfree(bytecode_node
);
2669 int lttng_event_notifier_add_callsite(struct lttng_kernel_event_notifier
*event_notifier
,
2670 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2673 switch (event_notifier
->priv
->parent
.instrumentation
) {
2674 case LTTNG_KERNEL_ABI_UPROBE
:
2675 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2683 void lttng_event_notifier_enabler_destroy(
2684 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2686 if (!event_notifier_enabler
) {
2690 list_del(&event_notifier_enabler
->node
);
2692 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2693 kfree(event_notifier_enabler
);
2697 * lttng_session_sync_event_enablers should be called just before starting a
2699 * Should be called with sessions mutex held.
2702 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2704 struct lttng_event_enabler
*event_enabler
;
2705 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2707 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2708 lttng_event_enabler_ref_events(event_enabler
);
2710 * For each event, if at least one of its enablers is enabled,
2711 * and its channel and session transient states are enabled, we
2712 * enable the event, else we disable it.
2714 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
2715 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2716 struct lttng_enabler_ref
*enabler_ref
;
2717 struct lttng_bytecode_runtime
*runtime
;
2718 int enabled
= 0, has_enablers_without_bytecode
= 0;
2720 switch (event_recorder_priv
->parent
.instrumentation
) {
2721 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2722 case LTTNG_KERNEL_ABI_SYSCALL
:
2724 list_for_each_entry(enabler_ref
,
2725 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2726 if (enabler_ref
->ref
->enabled
) {
2734 /* Not handled with lazy sync. */
2738 * Enabled state is based on union of enablers, with
2739 * intesection of session and channel transient enable
2742 enabled
= enabled
&& session
->tstate
&& event_recorder
->chan
->tstate
;
2744 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2746 * Sync tracepoint registration with event enabled
2750 register_event(event_recorder
);
2752 _lttng_event_unregister(event_recorder
);
2755 /* Check if has enablers without bytecode enabled */
2756 list_for_each_entry(enabler_ref
,
2757 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2758 if (enabler_ref
->ref
->enabled
2759 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2760 has_enablers_without_bytecode
= 1;
2764 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2765 has_enablers_without_bytecode
;
2767 /* Enable filters */
2768 list_for_each_entry(runtime
,
2769 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
)
2770 lttng_bytecode_filter_sync_state(runtime
);
2775 * Apply enablers to session events, adding events to session if need
2776 * be. It is required after each modification applied to an active
2777 * session, and right before session "start".
2778 * "lazy" sync means we only sync if required.
2779 * Should be called with sessions mutex held.
2782 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2784 /* We can skip if session is not active */
2785 if (!session
->active
)
2787 lttng_session_sync_event_enablers(session
);
2791 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2793 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2794 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2796 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2797 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2800 * For each event_notifier, if at least one of its enablers is enabled,
2801 * we enable the event_notifier, else we disable it.
2803 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2804 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2805 struct lttng_enabler_ref
*enabler_ref
;
2806 struct lttng_bytecode_runtime
*runtime
;
2807 int enabled
= 0, has_enablers_without_bytecode
= 0;
2809 switch (event_notifier_priv
->parent
.instrumentation
) {
2810 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2811 case LTTNG_KERNEL_ABI_SYSCALL
:
2812 /* Enable event_notifiers */
2813 list_for_each_entry(enabler_ref
,
2814 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2815 if (enabler_ref
->ref
->enabled
) {
2823 /* Not handled with sync. */
2827 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2829 * Sync tracepoint registration with event_notifier enabled
2833 if (!event_notifier_priv
->parent
.registered
)
2834 register_event_notifier(event_notifier
);
2836 if (event_notifier_priv
->parent
.registered
)
2837 _lttng_event_notifier_unregister(event_notifier
);
2840 /* Check if has enablers without bytecode enabled */
2841 list_for_each_entry(enabler_ref
,
2842 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2843 if (enabler_ref
->ref
->enabled
2844 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2845 has_enablers_without_bytecode
= 1;
2849 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2850 has_enablers_without_bytecode
;
2852 /* Enable filters */
2853 list_for_each_entry(runtime
,
2854 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
)
2855 lttng_bytecode_filter_sync_state(runtime
);
2857 /* Enable captures */
2858 list_for_each_entry(runtime
,
2859 &event_notifier_priv
->capture_bytecode_runtime_head
, node
)
2860 lttng_bytecode_capture_sync_state(runtime
);
2862 WRITE_ONCE(event_notifier
->eval_capture
, !!event_notifier_priv
->num_captures
);
2867 * Serialize at most one packet worth of metadata into a metadata
2869 * We grab the metadata cache mutex to get exclusive access to our metadata
2870 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2871 * allows us to do racy operations such as looking for remaining space left in
2872 * packet and write, since mutual exclusion protects us from concurrent writes.
2873 * Mutual exclusion on the metadata cache allow us to read the cache content
2874 * without racing against reallocation of the cache by updates.
2875 * Returns the number of bytes written in the channel, 0 if no data
2876 * was written and a negative value on error.
2878 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2879 struct channel
*chan
, bool *coherent
)
2881 struct lib_ring_buffer_ctx ctx
;
2883 size_t len
, reserve_len
;
2886 * Ensure we support mutiple get_next / put sequences followed by
2887 * put_next. The metadata cache lock protects reading the metadata
2888 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2889 * "flush" operations on the buffer invoked by different processes.
2890 * Moreover, since the metadata cache memory can be reallocated, we
2891 * need to have exclusive access against updates even though we only
2894 mutex_lock(&stream
->metadata_cache
->lock
);
2895 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2896 if (stream
->metadata_in
!= stream
->metadata_out
)
2899 /* Metadata regenerated, change the version. */
2900 if (stream
->metadata_cache
->version
!= stream
->version
)
2901 stream
->version
= stream
->metadata_cache
->version
;
2903 len
= stream
->metadata_cache
->metadata_written
-
2904 stream
->metadata_in
;
2907 reserve_len
= min_t(size_t,
2908 stream
->transport
->ops
.packet_avail_size(chan
),
2910 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2913 * If reservation failed, return an error to the caller.
2915 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2917 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2918 stream
->coherent
= false;
2921 stream
->transport
->ops
.event_write(&ctx
,
2922 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2924 stream
->transport
->ops
.event_commit(&ctx
);
2925 stream
->metadata_in
+= reserve_len
;
2926 if (reserve_len
< len
)
2927 stream
->coherent
= false;
2929 stream
->coherent
= true;
2934 *coherent
= stream
->coherent
;
2935 mutex_unlock(&stream
->metadata_cache
->lock
);
2940 void lttng_metadata_begin(struct lttng_session
*session
)
2942 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2943 mutex_lock(&session
->metadata_cache
->lock
);
2947 void lttng_metadata_end(struct lttng_session
*session
)
2949 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2950 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2951 struct lttng_metadata_stream
*stream
;
2953 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2954 wake_up_interruptible(&stream
->read_wait
);
2955 mutex_unlock(&session
->metadata_cache
->lock
);
2960 * Write the metadata to the metadata cache.
2961 * Must be called with sessions_mutex held.
2962 * The metadata cache lock protects us from concurrent read access from
2963 * thread outputting metadata content to ring buffer.
2964 * The content of the printf is printed as a single atomic metadata
2967 int lttng_metadata_printf(struct lttng_session
*session
,
2968 const char *fmt
, ...)
2974 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2977 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2983 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2984 if (session
->metadata_cache
->metadata_written
+ len
>
2985 session
->metadata_cache
->cache_alloc
) {
2986 char *tmp_cache_realloc
;
2987 unsigned int tmp_cache_alloc_size
;
2989 tmp_cache_alloc_size
= max_t(unsigned int,
2990 session
->metadata_cache
->cache_alloc
+ len
,
2991 session
->metadata_cache
->cache_alloc
<< 1);
2992 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2993 if (!tmp_cache_realloc
)
2995 if (session
->metadata_cache
->data
) {
2996 memcpy(tmp_cache_realloc
,
2997 session
->metadata_cache
->data
,
2998 session
->metadata_cache
->cache_alloc
);
2999 vfree(session
->metadata_cache
->data
);
3002 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3003 session
->metadata_cache
->data
= tmp_cache_realloc
;
3005 memcpy(session
->metadata_cache
->data
+
3006 session
->metadata_cache
->metadata_written
,
3008 session
->metadata_cache
->metadata_written
+= len
;
3019 int print_tabs(struct lttng_session
*session
, size_t nesting
)
3023 for (i
= 0; i
< nesting
; i
++) {
3026 ret
= lttng_metadata_printf(session
, " ");
3035 int lttng_field_name_statedump(struct lttng_session
*session
,
3036 const struct lttng_kernel_event_field
*field
,
3039 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3043 int _lttng_integer_type_statedump(struct lttng_session
*session
,
3044 const struct lttng_kernel_type_integer
*type
,
3045 enum lttng_kernel_string_encoding parent_encoding
,
3050 ret
= print_tabs(session
, nesting
);
3053 ret
= lttng_metadata_printf(session
,
3054 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3058 (parent_encoding
== lttng_kernel_string_encoding_none
)
3060 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3064 #if __BYTE_ORDER == __BIG_ENDIAN
3065 type
->reverse_byte_order
? " byte_order = le;" : ""
3067 type
->reverse_byte_order
? " byte_order = be;" : ""
3074 * Must be called with sessions_mutex held.
3077 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3078 const struct lttng_kernel_type_struct
*type
,
3082 uint32_t i
, nr_fields
;
3083 unsigned int alignment
;
3085 ret
= print_tabs(session
, nesting
);
3088 ret
= lttng_metadata_printf(session
,
3092 nr_fields
= type
->nr_fields
;
3093 for (i
= 0; i
< nr_fields
; i
++) {
3094 const struct lttng_kernel_event_field
*iter_field
;
3096 iter_field
= type
->fields
[i
];
3097 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3101 ret
= print_tabs(session
, nesting
);
3104 alignment
= type
->alignment
;
3106 ret
= lttng_metadata_printf(session
,
3110 ret
= lttng_metadata_printf(session
,
3117 * Must be called with sessions_mutex held.
3120 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3121 const struct lttng_kernel_event_field
*field
,
3126 ret
= _lttng_struct_type_statedump(session
,
3127 lttng_kernel_get_type_struct(field
->type
), nesting
);
3130 return lttng_field_name_statedump(session
, field
, nesting
);
3134 * Must be called with sessions_mutex held.
3137 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3138 const struct lttng_kernel_type_variant
*type
,
3142 uint32_t i
, nr_choices
;
3145 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3147 if (type
->alignment
!= 0)
3149 ret
= print_tabs(session
, nesting
);
3152 ret
= lttng_metadata_printf(session
,
3153 "variant <_%s> {\n",
3157 nr_choices
= type
->nr_choices
;
3158 for (i
= 0; i
< nr_choices
; i
++) {
3159 const struct lttng_kernel_event_field
*iter_field
;
3161 iter_field
= type
->choices
[i
];
3162 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3166 ret
= print_tabs(session
, nesting
);
3169 ret
= lttng_metadata_printf(session
,
3175 * Must be called with sessions_mutex held.
3178 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3179 const struct lttng_kernel_event_field
*field
,
3184 ret
= _lttng_variant_type_statedump(session
,
3185 lttng_kernel_get_type_variant(field
->type
), nesting
);
3188 return lttng_field_name_statedump(session
, field
, nesting
);
3192 * Must be called with sessions_mutex held.
3195 int _lttng_array_field_statedump(struct lttng_session
*session
,
3196 const struct lttng_kernel_event_field
*field
,
3200 const struct lttng_kernel_type_array
*array_type
;
3201 const struct lttng_kernel_type_common
*elem_type
;
3203 array_type
= lttng_kernel_get_type_array(field
->type
);
3204 WARN_ON_ONCE(!array_type
);
3206 if (array_type
->alignment
) {
3207 ret
= print_tabs(session
, nesting
);
3210 ret
= lttng_metadata_printf(session
,
3211 "struct { } align(%u) _%s_padding;\n",
3212 array_type
->alignment
* CHAR_BIT
,
3218 * Nested compound types: Only array of structures and variants are
3219 * currently supported.
3221 elem_type
= array_type
->elem_type
;
3222 switch (elem_type
->type
) {
3223 case lttng_kernel_type_integer
:
3224 case lttng_kernel_type_struct
:
3225 case lttng_kernel_type_variant
:
3226 ret
= _lttng_type_statedump(session
, elem_type
,
3227 array_type
->encoding
, nesting
);
3235 ret
= lttng_metadata_printf(session
,
3238 array_type
->length
);
3243 * Must be called with sessions_mutex held.
3246 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3247 const struct lttng_kernel_event_field
*field
,
3251 const char *length_name
;
3252 const struct lttng_kernel_type_sequence
*sequence_type
;
3253 const struct lttng_kernel_type_common
*elem_type
;
3255 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3256 WARN_ON_ONCE(!sequence_type
);
3258 length_name
= sequence_type
->length_name
;
3260 if (sequence_type
->alignment
) {
3261 ret
= print_tabs(session
, nesting
);
3264 ret
= lttng_metadata_printf(session
,
3265 "struct { } align(%u) _%s_padding;\n",
3266 sequence_type
->alignment
* CHAR_BIT
,
3273 * Nested compound types: Only array of structures and variants are
3274 * currently supported.
3276 elem_type
= sequence_type
->elem_type
;
3277 switch (elem_type
->type
) {
3278 case lttng_kernel_type_integer
:
3279 case lttng_kernel_type_struct
:
3280 case lttng_kernel_type_variant
:
3281 ret
= _lttng_type_statedump(session
, elem_type
,
3282 sequence_type
->encoding
, nesting
);
3290 ret
= lttng_metadata_printf(session
,
3293 sequence_type
->length_name
);
3298 * Must be called with sessions_mutex held.
3301 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3302 const struct lttng_kernel_type_enum
*type
,
3305 const struct lttng_kernel_enum_desc
*enum_desc
;
3306 const struct lttng_kernel_type_common
*container_type
;
3308 unsigned int i
, nr_entries
;
3310 container_type
= type
->container_type
;
3311 if (container_type
->type
!= lttng_kernel_type_integer
) {
3315 enum_desc
= type
->desc
;
3316 nr_entries
= enum_desc
->nr_entries
;
3318 ret
= print_tabs(session
, nesting
);
3321 ret
= lttng_metadata_printf(session
, "enum : ");
3324 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3325 lttng_kernel_string_encoding_none
, 0);
3328 ret
= lttng_metadata_printf(session
, " {\n");
3331 /* Dump all entries */
3332 for (i
= 0; i
< nr_entries
; i
++) {
3333 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3336 ret
= print_tabs(session
, nesting
+ 1);
3339 ret
= lttng_metadata_printf(session
,
3343 len
= strlen(entry
->string
);
3344 /* Escape the character '"' */
3345 for (j
= 0; j
< len
; j
++) {
3346 char c
= entry
->string
[j
];
3350 ret
= lttng_metadata_printf(session
,
3354 ret
= lttng_metadata_printf(session
,
3358 ret
= lttng_metadata_printf(session
,
3365 ret
= lttng_metadata_printf(session
, "\"");
3369 if (entry
->options
.is_auto
) {
3370 ret
= lttng_metadata_printf(session
, ",\n");
3374 ret
= lttng_metadata_printf(session
,
3378 if (entry
->start
.signedness
)
3379 ret
= lttng_metadata_printf(session
,
3380 "%lld", (long long) entry
->start
.value
);
3382 ret
= lttng_metadata_printf(session
,
3383 "%llu", entry
->start
.value
);
3386 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3388 == entry
->end
.value
) {
3389 ret
= lttng_metadata_printf(session
,
3392 if (entry
->end
.signedness
) {
3393 ret
= lttng_metadata_printf(session
,
3395 (long long) entry
->end
.value
);
3397 ret
= lttng_metadata_printf(session
,
3406 ret
= print_tabs(session
, nesting
);
3409 ret
= lttng_metadata_printf(session
, "}");
3415 * Must be called with sessions_mutex held.
3418 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3419 const struct lttng_kernel_event_field
*field
,
3423 const struct lttng_kernel_type_enum
*enum_type
;
3425 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3426 WARN_ON_ONCE(!enum_type
);
3427 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3430 return lttng_field_name_statedump(session
, field
, nesting
);
3434 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3435 const struct lttng_kernel_event_field
*field
,
3440 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3441 lttng_kernel_string_encoding_none
, nesting
);
3444 return lttng_field_name_statedump(session
, field
, nesting
);
3448 int _lttng_string_type_statedump(struct lttng_session
*session
,
3449 const struct lttng_kernel_type_string
*type
,
3454 /* Default encoding is UTF8 */
3455 ret
= print_tabs(session
, nesting
);
3458 ret
= lttng_metadata_printf(session
,
3460 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3461 " { encoding = ASCII; }" : "");
3466 int _lttng_string_field_statedump(struct lttng_session
*session
,
3467 const struct lttng_kernel_event_field
*field
,
3470 const struct lttng_kernel_type_string
*string_type
;
3473 string_type
= lttng_kernel_get_type_string(field
->type
);
3474 WARN_ON_ONCE(!string_type
);
3475 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3478 return lttng_field_name_statedump(session
, field
, nesting
);
3482 * Must be called with sessions_mutex held.
3485 int _lttng_type_statedump(struct lttng_session
*session
,
3486 const struct lttng_kernel_type_common
*type
,
3487 enum lttng_kernel_string_encoding parent_encoding
,
3492 switch (type
->type
) {
3493 case lttng_kernel_type_integer
:
3494 ret
= _lttng_integer_type_statedump(session
,
3495 lttng_kernel_get_type_integer(type
),
3496 parent_encoding
, nesting
);
3498 case lttng_kernel_type_enum
:
3499 ret
= _lttng_enum_type_statedump(session
,
3500 lttng_kernel_get_type_enum(type
),
3503 case lttng_kernel_type_string
:
3504 ret
= _lttng_string_type_statedump(session
,
3505 lttng_kernel_get_type_string(type
),
3508 case lttng_kernel_type_struct
:
3509 ret
= _lttng_struct_type_statedump(session
,
3510 lttng_kernel_get_type_struct(type
),
3513 case lttng_kernel_type_variant
:
3514 ret
= _lttng_variant_type_statedump(session
,
3515 lttng_kernel_get_type_variant(type
),
3519 /* Nested arrays and sequences are not supported yet. */
3520 case lttng_kernel_type_array
:
3521 case lttng_kernel_type_sequence
:
3530 * Must be called with sessions_mutex held.
3533 int _lttng_field_statedump(struct lttng_session
*session
,
3534 const struct lttng_kernel_event_field
*field
,
3539 switch (field
->type
->type
) {
3540 case lttng_kernel_type_integer
:
3541 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3543 case lttng_kernel_type_enum
:
3544 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3546 case lttng_kernel_type_string
:
3547 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3549 case lttng_kernel_type_struct
:
3550 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3552 case lttng_kernel_type_array
:
3553 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3555 case lttng_kernel_type_sequence
:
3556 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3558 case lttng_kernel_type_variant
:
3559 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3570 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3571 struct lttng_kernel_ctx
*ctx
)
3578 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3579 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3581 ret
= _lttng_field_statedump(session
, field
->event_field
, 2);
3589 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3590 struct lttng_kernel_event_recorder
*event_recorder
)
3592 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3596 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3597 const struct lttng_kernel_event_field
*field
= desc
->fields
[i
];
3599 ret
= _lttng_field_statedump(session
, field
, 2);
3607 * Must be called with sessions_mutex held.
3608 * The entire event metadata is printed as a single atomic metadata
3612 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3613 struct lttng_channel
*chan
,
3614 struct lttng_kernel_event_recorder
*event_recorder
)
3618 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3620 if (chan
->channel_type
== METADATA_CHANNEL
)
3623 lttng_metadata_begin(session
);
3625 ret
= lttng_metadata_printf(session
,
3629 " stream_id = %u;\n",
3630 event_recorder
->priv
->parent
.desc
->event_name
,
3631 event_recorder
->priv
->id
,
3632 event_recorder
->chan
->id
);
3636 ret
= lttng_metadata_printf(session
,
3637 " fields := struct {\n"
3642 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3647 * LTTng space reservation can only reserve multiples of the
3650 ret
= lttng_metadata_printf(session
,
3656 event_recorder
->priv
->metadata_dumped
= 1;
3658 lttng_metadata_end(session
);
3664 * Must be called with sessions_mutex held.
3665 * The entire channel metadata is printed as a single atomic metadata
3669 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3670 struct lttng_channel
*chan
)
3674 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3677 if (chan
->channel_type
== METADATA_CHANNEL
)
3680 lttng_metadata_begin(session
);
3682 WARN_ON_ONCE(!chan
->header_type
);
3683 ret
= lttng_metadata_printf(session
,
3686 " event.header := %s;\n"
3687 " packet.context := struct packet_context;\n",
3689 chan
->header_type
== 1 ? "struct event_header_compact" :
3690 "struct event_header_large");
3695 ret
= lttng_metadata_printf(session
,
3696 " event.context := struct {\n");
3700 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3704 ret
= lttng_metadata_printf(session
,
3710 ret
= lttng_metadata_printf(session
,
3713 chan
->metadata_dumped
= 1;
3715 lttng_metadata_end(session
);
3720 * Must be called with sessions_mutex held.
3723 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3725 return lttng_metadata_printf(session
,
3726 "struct packet_context {\n"
3727 " uint64_clock_monotonic_t timestamp_begin;\n"
3728 " uint64_clock_monotonic_t timestamp_end;\n"
3729 " uint64_t content_size;\n"
3730 " uint64_t packet_size;\n"
3731 " uint64_t packet_seq_num;\n"
3732 " unsigned long events_discarded;\n"
3733 " uint32_t cpu_id;\n"
3740 * id: range: 0 - 30.
3741 * id 31 is reserved to indicate an extended header.
3744 * id: range: 0 - 65534.
3745 * id 65535 is reserved to indicate an extended header.
3747 * Must be called with sessions_mutex held.
3750 int _lttng_event_header_declare(struct lttng_session
*session
)
3752 return lttng_metadata_printf(session
,
3753 "struct event_header_compact {\n"
3754 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3757 " uint27_clock_monotonic_t timestamp;\n"
3761 " uint64_clock_monotonic_t timestamp;\n"
3766 "struct event_header_large {\n"
3767 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3770 " uint32_clock_monotonic_t timestamp;\n"
3774 " uint64_clock_monotonic_t timestamp;\n"
3778 lttng_alignof(uint32_t) * CHAR_BIT
,
3779 lttng_alignof(uint16_t) * CHAR_BIT
3784 * Approximation of NTP time of day to clock monotonic correlation,
3785 * taken at start of trace.
3786 * Yes, this is only an approximation. Yes, we can (and will) do better
3787 * in future versions.
3788 * This function may return a negative offset. It may happen if the
3789 * system sets the REALTIME clock to 0 after boot.
3791 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3795 int64_t measure_clock_offset(void)
3797 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3798 uint64_t tcf
= trace_clock_freq();
3800 unsigned long flags
;
3801 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3802 struct timespec64 rts
= { 0, 0 };
3804 struct timespec rts
= { 0, 0 };
3807 /* Disable interrupts to increase correlation precision. */
3808 local_irq_save(flags
);
3809 monotonic
[0] = trace_clock_read64();
3810 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3811 ktime_get_real_ts64(&rts
);
3813 getnstimeofday(&rts
);
3815 monotonic
[1] = trace_clock_read64();
3816 local_irq_restore(flags
);
3818 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3819 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3820 if (tcf
== NSEC_PER_SEC
) {
3821 realtime
+= rts
.tv_nsec
;
3823 uint64_t n
= rts
.tv_nsec
* tcf
;
3825 do_div(n
, NSEC_PER_SEC
);
3828 offset
= (int64_t) realtime
- monotonic_avg
;
3833 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3841 while (cur
!= '\0') {
3844 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3848 ret
= lttng_metadata_printf(session
, "%c", '\\');
3851 /* We still print the current char */
3854 ret
= lttng_metadata_printf(session
, "%c", cur
);
3868 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3869 const char *field_value
)
3873 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3877 ret
= print_escaped_ctf_string(session
, field_value
);
3881 ret
= lttng_metadata_printf(session
, "\";\n");
3888 * Output metadata into this session's metadata buffers.
3889 * Must be called with sessions_mutex held.
3892 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3894 unsigned char *uuid_c
= session
->uuid
.b
;
3895 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3896 const char *product_uuid
;
3897 struct lttng_channel
*chan
;
3898 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3901 if (!LTTNG_READ_ONCE(session
->active
))
3904 lttng_metadata_begin(session
);
3906 if (session
->metadata_dumped
)
3909 snprintf(uuid_s
, sizeof(uuid_s
),
3910 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3911 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3912 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3913 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3914 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3916 ret
= lttng_metadata_printf(session
,
3917 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3918 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3919 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3920 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3921 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3922 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3923 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3929 " byte_order = %s;\n"
3930 " packet.header := struct {\n"
3931 " uint32_t magic;\n"
3932 " uint8_t uuid[16];\n"
3933 " uint32_t stream_id;\n"
3934 " uint64_t stream_instance_id;\n"
3937 lttng_alignof(uint8_t) * CHAR_BIT
,
3938 lttng_alignof(uint16_t) * CHAR_BIT
,
3939 lttng_alignof(uint32_t) * CHAR_BIT
,
3940 lttng_alignof(uint64_t) * CHAR_BIT
,
3941 sizeof(unsigned long) * CHAR_BIT
,
3942 lttng_alignof(unsigned long) * CHAR_BIT
,
3946 #if __BYTE_ORDER == __BIG_ENDIAN
3955 ret
= lttng_metadata_printf(session
,
3957 " hostname = \"%s\";\n"
3958 " domain = \"kernel\";\n"
3959 " sysname = \"%s\";\n"
3960 " kernel_release = \"%s\";\n"
3961 " kernel_version = \"%s\";\n"
3962 " tracer_name = \"lttng-modules\";\n"
3963 " tracer_major = %d;\n"
3964 " tracer_minor = %d;\n"
3965 " tracer_patchlevel = %d;\n"
3966 " trace_buffering_scheme = \"global\";\n",
3967 current
->nsproxy
->uts_ns
->name
.nodename
,
3971 LTTNG_MODULES_MAJOR_VERSION
,
3972 LTTNG_MODULES_MINOR_VERSION
,
3973 LTTNG_MODULES_PATCHLEVEL_VERSION
3978 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3981 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3982 session
->creation_time
);
3986 /* Add the product UUID to the 'env' section */
3987 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3989 ret
= lttng_metadata_printf(session
,
3990 " product_uuid = \"%s\";\n",
3997 /* Close the 'env' section */
3998 ret
= lttng_metadata_printf(session
, "};\n\n");
4002 ret
= lttng_metadata_printf(session
,
4004 " name = \"%s\";\n",
4010 if (!trace_clock_uuid(clock_uuid_s
)) {
4011 ret
= lttng_metadata_printf(session
,
4012 " uuid = \"%s\";\n",
4019 ret
= lttng_metadata_printf(session
,
4020 " description = \"%s\";\n"
4021 " freq = %llu; /* Frequency, in Hz */\n"
4022 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4025 trace_clock_description(),
4026 (unsigned long long) trace_clock_freq(),
4027 (long long) measure_clock_offset()
4032 ret
= lttng_metadata_printf(session
,
4033 "typealias integer {\n"
4034 " size = 27; align = 1; signed = false;\n"
4035 " map = clock.%s.value;\n"
4036 "} := uint27_clock_monotonic_t;\n"
4038 "typealias integer {\n"
4039 " size = 32; align = %u; signed = false;\n"
4040 " map = clock.%s.value;\n"
4041 "} := uint32_clock_monotonic_t;\n"
4043 "typealias integer {\n"
4044 " size = 64; align = %u; signed = false;\n"
4045 " map = clock.%s.value;\n"
4046 "} := uint64_clock_monotonic_t;\n\n",
4048 lttng_alignof(uint32_t) * CHAR_BIT
,
4050 lttng_alignof(uint64_t) * CHAR_BIT
,
4056 ret
= _lttng_stream_packet_context_declare(session
);
4060 ret
= _lttng_event_header_declare(session
);
4065 list_for_each_entry(chan
, &session
->chan
, list
) {
4066 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4071 list_for_each_entry(event_recorder_priv
, &session
->events
, node
) {
4072 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4073 event_recorder_priv
->pub
);
4077 session
->metadata_dumped
= 1;
4079 lttng_metadata_end(session
);
4084 * lttng_transport_register - LTT transport registration
4085 * @transport: transport structure
4087 * Registers a transport which can be used as output to extract the data out of
4088 * LTTng. The module calling this registration function must ensure that no
4089 * trap-inducing code will be executed by the transport functions. E.g.
4090 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4091 * is made visible to the transport function. This registration acts as a
4092 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4093 * after its registration must it synchronize the TLBs.
4095 void lttng_transport_register(struct lttng_transport
*transport
)
4098 * Make sure no page fault can be triggered by the module about to be
4099 * registered. We deal with this here so we don't have to call
4100 * vmalloc_sync_mappings() in each module's init.
4102 wrapper_vmalloc_sync_mappings();
4104 mutex_lock(&sessions_mutex
);
4105 list_add_tail(&transport
->node
, <tng_transport_list
);
4106 mutex_unlock(&sessions_mutex
);
4108 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4111 * lttng_transport_unregister - LTT transport unregistration
4112 * @transport: transport structure
4114 void lttng_transport_unregister(struct lttng_transport
*transport
)
4116 mutex_lock(&sessions_mutex
);
4117 list_del(&transport
->node
);
4118 mutex_unlock(&sessions_mutex
);
4120 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4122 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4125 * Make sure no page fault can be triggered by the module about to be
4126 * registered. We deal with this here so we don't have to call
4127 * vmalloc_sync_mappings() in each module's init.
4129 wrapper_vmalloc_sync_mappings();
4131 mutex_lock(&sessions_mutex
);
4132 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4133 mutex_unlock(&sessions_mutex
);
4135 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4137 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4139 mutex_lock(&sessions_mutex
);
4140 list_del(&transport
->node
);
4141 mutex_unlock(&sessions_mutex
);
4143 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4145 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4147 enum cpuhp_state lttng_hp_prepare
;
4148 enum cpuhp_state lttng_hp_online
;
4150 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4152 struct lttng_cpuhp_node
*lttng_node
;
4154 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4155 switch (lttng_node
->component
) {
4156 case LTTNG_RING_BUFFER_FRONTEND
:
4158 case LTTNG_RING_BUFFER_BACKEND
:
4159 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4160 case LTTNG_RING_BUFFER_ITER
:
4162 case LTTNG_CONTEXT_PERF_COUNTERS
:
4169 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4171 struct lttng_cpuhp_node
*lttng_node
;
4173 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4174 switch (lttng_node
->component
) {
4175 case LTTNG_RING_BUFFER_FRONTEND
:
4176 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4177 case LTTNG_RING_BUFFER_BACKEND
:
4179 case LTTNG_RING_BUFFER_ITER
:
4181 case LTTNG_CONTEXT_PERF_COUNTERS
:
4182 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4188 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4190 struct lttng_cpuhp_node
*lttng_node
;
4192 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4193 switch (lttng_node
->component
) {
4194 case LTTNG_RING_BUFFER_FRONTEND
:
4195 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4196 case LTTNG_RING_BUFFER_BACKEND
:
4198 case LTTNG_RING_BUFFER_ITER
:
4199 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4200 case LTTNG_CONTEXT_PERF_COUNTERS
:
4201 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4207 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4209 struct lttng_cpuhp_node
*lttng_node
;
4211 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4212 switch (lttng_node
->component
) {
4213 case LTTNG_RING_BUFFER_FRONTEND
:
4214 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4215 case LTTNG_RING_BUFFER_BACKEND
:
4217 case LTTNG_RING_BUFFER_ITER
:
4219 case LTTNG_CONTEXT_PERF_COUNTERS
:
4226 static int __init
lttng_init_cpu_hotplug(void)
4230 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4231 lttng_hotplug_prepare
,
4232 lttng_hotplug_dead
);
4236 lttng_hp_prepare
= ret
;
4237 lttng_rb_set_hp_prepare(ret
);
4239 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4240 lttng_hotplug_online
,
4241 lttng_hotplug_offline
);
4243 cpuhp_remove_multi_state(lttng_hp_prepare
);
4244 lttng_hp_prepare
= 0;
4247 lttng_hp_online
= ret
;
4248 lttng_rb_set_hp_online(ret
);
4253 static void __exit
lttng_exit_cpu_hotplug(void)
4255 lttng_rb_set_hp_online(0);
4256 cpuhp_remove_multi_state(lttng_hp_online
);
4257 lttng_rb_set_hp_prepare(0);
4258 cpuhp_remove_multi_state(lttng_hp_prepare
);
4261 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4262 static int lttng_init_cpu_hotplug(void)
4266 static void lttng_exit_cpu_hotplug(void)
4269 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4272 static int __init
lttng_events_init(void)
4276 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4279 ret
= wrapper_get_pfnblock_flags_mask_init();
4282 ret
= wrapper_get_pageblock_flags_mask_init();
4285 ret
= lttng_probes_init();
4288 ret
= lttng_context_init();
4291 ret
= lttng_tracepoint_init();
4294 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4295 if (!event_recorder_cache
) {
4297 goto error_kmem_event_recorder
;
4299 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4300 if (!event_recorder_private_cache
) {
4302 goto error_kmem_event_recorder_private
;
4304 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4305 if (!event_notifier_cache
) {
4307 goto error_kmem_event_notifier
;
4309 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4310 if (!event_notifier_private_cache
) {
4312 goto error_kmem_event_notifier_private
;
4314 ret
= lttng_abi_init();
4317 ret
= lttng_logger_init();
4320 ret
= lttng_init_cpu_hotplug();
4323 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4324 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4325 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4326 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4327 LTTNG_MODULES_EXTRAVERSION
,
4329 #ifdef LTTNG_EXTRA_VERSION_GIT
4330 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4334 #ifdef LTTNG_EXTRA_VERSION_NAME
4335 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4342 lttng_logger_exit();
4346 kmem_cache_destroy(event_notifier_private_cache
);
4347 error_kmem_event_notifier_private
:
4348 kmem_cache_destroy(event_notifier_cache
);
4349 error_kmem_event_notifier
:
4350 kmem_cache_destroy(event_recorder_private_cache
);
4351 error_kmem_event_recorder_private
:
4352 kmem_cache_destroy(event_recorder_cache
);
4353 error_kmem_event_recorder
:
4354 lttng_tracepoint_exit();
4356 lttng_context_exit();
4357 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4358 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4359 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4360 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4361 LTTNG_MODULES_EXTRAVERSION
,
4363 #ifdef LTTNG_EXTRA_VERSION_GIT
4364 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4368 #ifdef LTTNG_EXTRA_VERSION_NAME
4369 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4376 module_init(lttng_events_init
);
4378 static void __exit
lttng_events_exit(void)
4380 struct lttng_session
*session
, *tmpsession
;
4382 lttng_exit_cpu_hotplug();
4383 lttng_logger_exit();
4385 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4386 lttng_session_destroy(session
);
4387 kmem_cache_destroy(event_recorder_cache
);
4388 kmem_cache_destroy(event_recorder_private_cache
);
4389 kmem_cache_destroy(event_notifier_cache
);
4390 kmem_cache_destroy(event_notifier_private_cache
);
4391 lttng_tracepoint_exit();
4392 lttng_context_exit();
4393 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4394 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4395 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4396 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4397 LTTNG_MODULES_EXTRAVERSION
,
4399 #ifdef LTTNG_EXTRA_VERSION_GIT
4400 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4404 #ifdef LTTNG_EXTRA_VERSION_NAME
4405 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4411 module_exit(lttng_events_exit
);
4413 #include <generated/patches.h>
4414 #ifdef LTTNG_EXTRA_VERSION_GIT
4415 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4417 #ifdef LTTNG_EXTRA_VERSION_NAME
4418 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4420 MODULE_LICENSE("GPL and additional rights");
4421 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4422 MODULE_DESCRIPTION("LTTng tracer");
4423 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4424 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4425 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4426 LTTNG_MODULES_EXTRAVERSION
);