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 <wrapper/barrier.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.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 <counter/counter.h>
50 #include <wrapper/time.h>
52 #define METADATA_CACHE_DEFAULT_SIZE 4096
54 static LIST_HEAD(sessions
);
55 static LIST_HEAD(event_notifier_groups
);
56 static LIST_HEAD(lttng_transport_list
);
57 static LIST_HEAD(lttng_counter_transport_list
);
59 * Protect the sessions and metadata caches.
61 static DEFINE_MUTEX(sessions_mutex
);
62 static struct kmem_cache
*event_cache
;
63 static struct kmem_cache
*event_notifier_cache
;
65 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
66 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
67 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
68 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
69 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
71 static void _lttng_event_destroy(struct lttng_event
*event
);
72 static void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
);
73 static void _lttng_channel_destroy(struct lttng_channel
*channel
);
74 static void _lttng_session_counter_destroy(struct lttng_counter
*counter
);
75 static int _lttng_event_unregister(struct lttng_event
*event
);
76 static int _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
);
78 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
79 struct lttng_event
*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_type
*type
,
89 int _lttng_field_statedump(struct lttng_session
*session
,
90 const struct lttng_event_field
*field
,
93 static bool lttng_event_container_is_metadata_channel(struct lttng_event_container
*container
)
95 switch (container
->type
) {
96 case LTTNG_EVENT_CONTAINER_CHANNEL
:
98 struct lttng_channel
*chan
= lttng_event_container_get_channel(container
);
100 return chan
->channel_type
== METADATA_CHANNEL
;
102 case LTTNG_EVENT_CONTAINER_COUNTER
:
109 static bool lttng_event_within_metadata_channel(struct lttng_event
*event
)
111 return lttng_event_container_is_metadata_channel(event
->container
);
114 void synchronize_trace(void)
116 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
122 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
123 #ifdef CONFIG_PREEMPT_RT_FULL
126 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
127 #ifdef CONFIG_PREEMPT_RT
130 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
133 void lttng_lock_sessions(void)
135 mutex_lock(&sessions_mutex
);
138 void lttng_unlock_sessions(void)
140 mutex_unlock(&sessions_mutex
);
143 static struct lttng_transport
*lttng_transport_find(const char *name
)
145 struct lttng_transport
*transport
;
147 list_for_each_entry(transport
, <tng_transport_list
, node
) {
148 if (!strcmp(transport
->name
, name
))
155 * Called with sessions lock held.
157 int lttng_session_active(void)
159 struct lttng_session
*iter
;
161 list_for_each_entry(iter
, &sessions
, list
) {
168 struct lttng_session
*lttng_session_create(void)
170 struct lttng_session
*session
;
171 struct lttng_metadata_cache
*metadata_cache
;
174 mutex_lock(&sessions_mutex
);
175 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
178 INIT_LIST_HEAD(&session
->chan
);
179 INIT_LIST_HEAD(&session
->events
);
180 INIT_LIST_HEAD(&session
->counters
);
181 lttng_guid_gen(&session
->uuid
);
183 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
186 goto err_free_session
;
187 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
188 if (!metadata_cache
->data
)
190 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
191 kref_init(&metadata_cache
->refcount
);
192 mutex_init(&metadata_cache
->lock
);
193 session
->metadata_cache
= metadata_cache
;
194 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
195 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
196 sizeof(metadata_cache
->uuid
));
197 INIT_LIST_HEAD(&session
->enablers_head
);
198 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
199 INIT_HLIST_HEAD(&session
->events_name_ht
.table
[i
]);
200 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
201 INIT_HLIST_HEAD(&session
->events_key_ht
.table
[i
]);
202 list_add(&session
->list
, &sessions
);
203 session
->pid_tracker
.session
= session
;
204 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
205 session
->vpid_tracker
.session
= session
;
206 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
207 session
->uid_tracker
.session
= session
;
208 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
209 session
->vuid_tracker
.session
= session
;
210 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
211 session
->gid_tracker
.session
= session
;
212 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
213 session
->vgid_tracker
.session
= session
;
214 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
215 mutex_unlock(&sessions_mutex
);
219 kfree(metadata_cache
);
221 lttng_kvfree(session
);
223 mutex_unlock(&sessions_mutex
);
228 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
230 struct lttng_counter_transport
*transport
;
232 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
233 if (!strcmp(transport
->name
, name
))
240 struct lttng_counter
*lttng_kernel_counter_create(
241 const char *counter_transport_name
,
242 size_t number_dimensions
, const size_t *dimensions_sizes
,
245 struct lttng_counter_transport
*counter_transport
= NULL
;
246 struct lttng_counter
*counter
= NULL
;
247 struct lttng_event_container
*container
;
249 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
250 if (!counter_transport
) {
251 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
252 counter_transport_name
);
255 if (!try_module_get(counter_transport
->owner
)) {
256 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
260 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
263 container
= lttng_counter_get_event_container(counter
);
264 container
->type
= LTTNG_EVENT_CONTAINER_COUNTER
;
265 container
->coalesce_hits
= coalesce_hits
;
266 /* Create event notifier error counter. */
267 counter
->ops
= &counter_transport
->ops
;
268 counter
->transport
= counter_transport
;
269 mutex_init(&counter
->map
.lock
);
271 counter
->counter
= counter
->ops
->counter_create(
272 number_dimensions
, dimensions_sizes
, 0);
273 if (!counter
->counter
) {
274 printk(KERN_WARNING
"LTTng: Error creating counter");
281 lttng_kvfree(counter
);
283 if (counter_transport
)
284 module_put(counter_transport
->owner
);
290 void lttng_kernel_counter_destroy(struct lttng_counter
*counter
)
292 counter
->ops
->counter_destroy(counter
->counter
);
293 module_put(counter
->transport
->owner
);
294 lttng_kvfree(counter
->map
.descriptors
);
295 lttng_kvfree(counter
);
298 int lttng_event_notifier_group_set_error_counter(
299 struct lttng_event_notifier_group
*event_notifier_group
,
300 const char *counter_transport_name
,
303 struct lttng_counter
*counter
;
307 * Lock sessions to provide mutual exclusion against concurrent
308 * modification of trigger group, which would result in
309 * overwriting the error counter if set concurrently.
311 mutex_lock(&sessions_mutex
);
313 if (event_notifier_group
->error_counter
) {
314 printk(KERN_ERR
"Error counter already set in event notifier group\n");
319 counter
= lttng_kernel_counter_create(counter_transport_name
,
320 1, &counter_len
, false);
326 event_notifier_group
->error_counter_len
= counter_len
;
328 * store-release to publish error counter matches load-acquire
329 * in record_error. Ensures the counter is created and the
330 * error_counter_len is set before they are used.
332 lttng_smp_store_release(&event_notifier_group
->error_counter
,
335 mutex_unlock(&sessions_mutex
);
339 mutex_unlock(&sessions_mutex
);
343 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
345 struct lttng_transport
*transport
= NULL
;
346 struct lttng_event_notifier_group
*event_notifier_group
;
347 const char *transport_name
= "relay-event-notifier";
348 size_t subbuf_size
= 4096; //TODO
349 size_t num_subbuf
= 16; //TODO
350 unsigned int switch_timer_interval
= 0;
351 unsigned int read_timer_interval
= 0;
354 mutex_lock(&sessions_mutex
);
356 transport
= lttng_transport_find(transport_name
);
358 printk(KERN_WARNING
"LTTng: transport %s not found\n",
362 if (!try_module_get(transport
->owner
)) {
363 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
368 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
370 if (!event_notifier_group
)
374 * Initialize the ring buffer used to store event notifier
377 event_notifier_group
->ops
= &transport
->ops
;
378 event_notifier_group
->chan
= transport
->ops
.channel_create(
379 transport_name
, event_notifier_group
, NULL
,
380 subbuf_size
, num_subbuf
, switch_timer_interval
,
381 read_timer_interval
);
382 if (!event_notifier_group
->chan
)
385 event_notifier_group
->transport
= transport
;
387 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
388 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
389 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
390 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
392 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
394 mutex_unlock(&sessions_mutex
);
396 return event_notifier_group
;
399 lttng_kvfree(event_notifier_group
);
402 module_put(transport
->owner
);
404 mutex_unlock(&sessions_mutex
);
408 struct lttng_counter
*lttng_session_create_counter(
409 struct lttng_session
*session
,
410 const char *counter_transport_name
,
411 size_t number_dimensions
, const size_t *dimensions_sizes
,
414 struct lttng_counter
*counter
;
415 struct lttng_event_container
*container
;
417 counter
= lttng_kernel_counter_create(counter_transport_name
,
418 number_dimensions
, dimensions_sizes
,
423 container
= lttng_counter_get_event_container(counter
);
425 mutex_lock(&sessions_mutex
);
426 container
->session
= session
;
427 list_add(&counter
->node
, &session
->counters
);
428 mutex_unlock(&sessions_mutex
);
436 void metadata_cache_destroy(struct kref
*kref
)
438 struct lttng_metadata_cache
*cache
=
439 container_of(kref
, struct lttng_metadata_cache
, refcount
);
444 void lttng_session_destroy(struct lttng_session
*session
)
446 struct lttng_channel
*chan
, *tmpchan
;
447 struct lttng_event
*event
, *tmpevent
;
448 struct lttng_metadata_stream
*metadata_stream
;
449 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
450 struct lttng_counter
*counter
, *tmpcounter
;
453 mutex_lock(&sessions_mutex
);
454 WRITE_ONCE(session
->active
, 0);
455 list_for_each_entry(chan
, &session
->chan
, list
) {
456 ret
= lttng_syscalls_unregister_event_container(lttng_channel_get_event_container(chan
));
459 list_for_each_entry(counter
, &session
->counters
, node
) {
460 ret
= lttng_syscalls_unregister_event_container(lttng_counter_get_event_container(counter
));
463 list_for_each_entry(event
, &session
->events
, list
) {
464 ret
= _lttng_event_unregister(event
);
467 synchronize_trace(); /* Wait for in-flight events to complete */
468 list_for_each_entry(chan
, &session
->chan
, list
) {
469 ret
= lttng_syscalls_destroy_event_container(lttng_channel_get_event_container(chan
));
472 list_for_each_entry(counter
, &session
->counters
, node
) {
473 ret
= lttng_syscalls_destroy_event_container(lttng_counter_get_event_container(counter
));
476 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
477 &session
->enablers_head
, node
)
478 lttng_event_enabler_destroy(event_enabler
);
479 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
480 _lttng_event_destroy(event
);
481 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
482 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
483 _lttng_channel_destroy(chan
);
485 list_for_each_entry_safe(counter
, tmpcounter
, &session
->counters
, node
)
486 _lttng_session_counter_destroy(counter
);
487 mutex_lock(&session
->metadata_cache
->lock
);
488 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
489 _lttng_metadata_channel_hangup(metadata_stream
);
490 mutex_unlock(&session
->metadata_cache
->lock
);
491 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
492 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
493 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
494 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
495 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
496 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
497 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
498 list_del(&session
->list
);
499 mutex_unlock(&sessions_mutex
);
500 lttng_kvfree(session
);
503 void lttng_event_notifier_group_destroy(
504 struct lttng_event_notifier_group
*event_notifier_group
)
506 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
507 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
510 if (!event_notifier_group
)
513 mutex_lock(&sessions_mutex
);
515 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
518 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
519 &event_notifier_group
->event_notifiers_head
, list
) {
520 ret
= _lttng_event_notifier_unregister(event_notifier
);
524 /* Wait for in-flight event notifier to complete */
527 irq_work_sync(&event_notifier_group
->wakeup_pending
);
529 kfree(event_notifier_group
->sc_filter
);
531 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
532 &event_notifier_group
->enablers_head
, node
)
533 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
535 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
536 &event_notifier_group
->event_notifiers_head
, list
)
537 _lttng_event_notifier_destroy(event_notifier
);
539 if (event_notifier_group
->error_counter
) {
540 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
542 lttng_kernel_counter_destroy(error_counter
);
543 event_notifier_group
->error_counter
= NULL
;
546 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
547 module_put(event_notifier_group
->transport
->owner
);
548 list_del(&event_notifier_group
->node
);
550 mutex_unlock(&sessions_mutex
);
551 lttng_kvfree(event_notifier_group
);
554 int lttng_session_statedump(struct lttng_session
*session
)
558 mutex_lock(&sessions_mutex
);
559 ret
= lttng_statedump_start(session
);
560 mutex_unlock(&sessions_mutex
);
564 int lttng_session_enable(struct lttng_session
*session
)
567 struct lttng_channel
*chan
;
569 mutex_lock(&sessions_mutex
);
570 if (session
->active
) {
575 /* Set transient enabler state to "enabled" */
578 /* We need to sync enablers with session before activation. */
579 lttng_session_sync_event_enablers(session
);
582 * Snapshot the number of events per channel to know the type of header
585 list_for_each_entry(chan
, &session
->chan
, list
) {
586 if (chan
->header_type
)
587 continue; /* don't change it if session stop/restart */
588 if (chan
->free_event_id
< 31)
589 chan
->header_type
= 1; /* compact */
591 chan
->header_type
= 2; /* large */
594 /* Clear each stream's quiescent state. */
595 list_for_each_entry(chan
, &session
->chan
, list
) {
596 if (chan
->channel_type
!= METADATA_CHANNEL
)
597 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
600 WRITE_ONCE(session
->active
, 1);
601 WRITE_ONCE(session
->been_active
, 1);
602 ret
= _lttng_session_metadata_statedump(session
);
604 WRITE_ONCE(session
->active
, 0);
607 ret
= lttng_statedump_start(session
);
609 WRITE_ONCE(session
->active
, 0);
611 mutex_unlock(&sessions_mutex
);
615 int lttng_session_disable(struct lttng_session
*session
)
618 struct lttng_channel
*chan
;
620 mutex_lock(&sessions_mutex
);
621 if (!session
->active
) {
625 WRITE_ONCE(session
->active
, 0);
627 /* Set transient enabler state to "disabled" */
629 lttng_session_sync_event_enablers(session
);
631 /* Set each stream's quiescent state. */
632 list_for_each_entry(chan
, &session
->chan
, list
) {
633 if (chan
->channel_type
!= METADATA_CHANNEL
)
634 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
637 mutex_unlock(&sessions_mutex
);
641 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
644 struct lttng_channel
*chan
;
645 struct lttng_event
*event
;
646 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
647 struct lttng_metadata_stream
*stream
;
649 mutex_lock(&sessions_mutex
);
650 if (!session
->active
) {
655 mutex_lock(&cache
->lock
);
656 memset(cache
->data
, 0, cache
->cache_alloc
);
657 cache
->metadata_written
= 0;
659 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
660 stream
->metadata_out
= 0;
661 stream
->metadata_in
= 0;
663 mutex_unlock(&cache
->lock
);
665 session
->metadata_dumped
= 0;
666 list_for_each_entry(chan
, &session
->chan
, list
) {
667 chan
->metadata_dumped
= 0;
670 list_for_each_entry(event
, &session
->events
, list
) {
671 event
->metadata_dumped
= 0;
674 ret
= _lttng_session_metadata_statedump(session
);
677 mutex_unlock(&sessions_mutex
);
681 int lttng_event_container_enable(struct lttng_event_container
*container
)
685 mutex_lock(&sessions_mutex
);
686 if (lttng_event_container_is_metadata_channel(container
)) {
690 if (container
->enabled
) {
694 /* Set transient enabler state to "enabled" */
695 container
->tstate
= 1;
696 lttng_session_sync_event_enablers(container
->session
);
697 /* Set atomically the state to "enabled" */
698 WRITE_ONCE(container
->enabled
, 1);
700 mutex_unlock(&sessions_mutex
);
704 int lttng_event_container_disable(struct lttng_event_container
*container
)
708 mutex_lock(&sessions_mutex
);
709 if (lttng_event_container_is_metadata_channel(container
)) {
713 if (!container
->enabled
) {
717 /* Set atomically the state to "disabled" */
718 WRITE_ONCE(container
->enabled
, 0);
719 /* Set transient enabler state to "enabled" */
720 container
->tstate
= 0;
721 lttng_session_sync_event_enablers(container
->session
);
723 mutex_unlock(&sessions_mutex
);
727 int lttng_event_enable(struct lttng_event
*event
)
731 mutex_lock(&sessions_mutex
);
732 if (lttng_event_within_metadata_channel(event
)) {
736 if (event
->enabled
) {
740 switch (event
->instrumentation
) {
741 case LTTNG_KERNEL_TRACEPOINT
:
742 case LTTNG_KERNEL_SYSCALL
:
745 case LTTNG_KERNEL_KPROBE
:
746 case LTTNG_KERNEL_UPROBE
:
747 case LTTNG_KERNEL_NOOP
:
748 WRITE_ONCE(event
->enabled
, 1);
750 case LTTNG_KERNEL_KRETPROBE
:
751 ret
= lttng_kretprobes_event_enable_state(event
, 1);
753 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
759 mutex_unlock(&sessions_mutex
);
763 int lttng_event_disable(struct lttng_event
*event
)
767 mutex_lock(&sessions_mutex
);
768 if (lttng_event_within_metadata_channel(event
)) {
772 if (!event
->enabled
) {
776 switch (event
->instrumentation
) {
777 case LTTNG_KERNEL_TRACEPOINT
:
778 case LTTNG_KERNEL_SYSCALL
:
781 case LTTNG_KERNEL_KPROBE
:
782 case LTTNG_KERNEL_UPROBE
:
783 case LTTNG_KERNEL_NOOP
:
784 WRITE_ONCE(event
->enabled
, 0);
786 case LTTNG_KERNEL_KRETPROBE
:
787 ret
= lttng_kretprobes_event_enable_state(event
, 0);
789 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
795 mutex_unlock(&sessions_mutex
);
799 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
803 mutex_lock(&sessions_mutex
);
804 if (event_notifier
->enabled
) {
808 switch (event_notifier
->instrumentation
) {
809 case LTTNG_KERNEL_TRACEPOINT
:
810 case LTTNG_KERNEL_SYSCALL
:
813 case LTTNG_KERNEL_KPROBE
:
814 case LTTNG_KERNEL_UPROBE
:
815 WRITE_ONCE(event_notifier
->enabled
, 1);
817 case LTTNG_KERNEL_FUNCTION
:
818 case LTTNG_KERNEL_NOOP
:
819 case LTTNG_KERNEL_KRETPROBE
:
825 mutex_unlock(&sessions_mutex
);
829 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
833 mutex_lock(&sessions_mutex
);
834 if (!event_notifier
->enabled
) {
838 switch (event_notifier
->instrumentation
) {
839 case LTTNG_KERNEL_TRACEPOINT
:
840 case LTTNG_KERNEL_SYSCALL
:
843 case LTTNG_KERNEL_KPROBE
:
844 case LTTNG_KERNEL_UPROBE
:
845 WRITE_ONCE(event_notifier
->enabled
, 0);
847 case LTTNG_KERNEL_FUNCTION
:
848 case LTTNG_KERNEL_NOOP
:
849 case LTTNG_KERNEL_KRETPROBE
:
855 mutex_unlock(&sessions_mutex
);
859 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
860 const char *transport_name
,
862 size_t subbuf_size
, size_t num_subbuf
,
863 unsigned int switch_timer_interval
,
864 unsigned int read_timer_interval
,
865 enum channel_type channel_type
)
867 struct lttng_event_container
*container
;
868 struct lttng_channel
*chan
= NULL
;
869 struct lttng_transport
*transport
= NULL
;
871 mutex_lock(&sessions_mutex
);
872 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
873 goto active
; /* Refuse to add channel to active session */
874 transport
= lttng_transport_find(transport_name
);
876 printk(KERN_WARNING
"LTTng: transport %s not found\n",
880 if (!try_module_get(transport
->owner
)) {
881 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
884 chan
= lttng_kvzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
887 container
= lttng_channel_get_event_container(chan
);
888 container
->type
= LTTNG_EVENT_CONTAINER_CHANNEL
;
889 container
->session
= session
;
890 container
->tstate
= 1;
891 container
->enabled
= 1;
893 * The ring buffer always coalesces hits from various event
894 * enablers matching a given event to a single event record within the
897 container
->coalesce_hits
= true;
899 chan
->id
= session
->free_chan_id
++;
900 chan
->ops
= &transport
->ops
;
902 * Note: the channel creation op already writes into the packet
903 * headers. Therefore the "chan" information used as input
904 * should be already accessible.
906 chan
->chan
= transport
->ops
.channel_create(transport_name
,
907 container
, buf_addr
, subbuf_size
, num_subbuf
,
908 switch_timer_interval
, read_timer_interval
);
911 chan
->transport
= transport
;
912 chan
->channel_type
= channel_type
;
913 list_add(&chan
->list
, &session
->chan
);
914 mutex_unlock(&sessions_mutex
);
921 module_put(transport
->owner
);
924 mutex_unlock(&sessions_mutex
);
929 void _lttng_session_counter_destroy(struct lttng_counter
*counter
)
931 list_del(&counter
->node
);
932 lttng_kernel_counter_destroy(counter
);
936 * Only used internally at session destruction for per-cpu channels, and
937 * when metadata channel is released.
938 * Needs to be called with sessions mutex held.
941 void _lttng_channel_destroy(struct lttng_channel
*chan
)
943 chan
->ops
->channel_destroy(chan
->chan
);
944 module_put(chan
->transport
->owner
);
945 list_del(&chan
->list
);
946 lttng_destroy_context(chan
->ctx
);
950 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
952 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
953 /* Protect the metadata cache with the sessions_mutex. */
954 mutex_lock(&sessions_mutex
);
955 _lttng_channel_destroy(chan
);
956 mutex_unlock(&sessions_mutex
);
958 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
961 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
963 stream
->finalized
= 1;
964 wake_up_interruptible(&stream
->read_wait
);
968 bool lttng_event_container_current_id_full(struct lttng_event_container
*container
)
970 switch (container
->type
) {
971 case LTTNG_EVENT_CONTAINER_CHANNEL
:
973 struct lttng_channel
*channel
= lttng_event_container_get_channel(container
);
975 return channel
->free_event_id
== -1U;
977 case LTTNG_EVENT_CONTAINER_COUNTER
:
979 struct lttng_counter
*counter
= lttng_event_container_get_counter(container
);
980 size_t nr_dimensions
, max_nr_elem
;
982 if (lttng_counter_get_nr_dimensions(&counter
->counter
->config
,
983 counter
->counter
, &nr_dimensions
))
985 WARN_ON_ONCE(nr_dimensions
!= 1);
986 if (nr_dimensions
!= 1)
988 if (lttng_counter_get_max_nr_elem(&counter
->counter
->config
,
989 counter
->counter
, &max_nr_elem
))
991 return counter
->free_index
>= max_nr_elem
;
1001 int lttng_event_container_allocate_id(struct lttng_event_container
*container
,
1002 const char *key_string
, size_t *id
)
1004 struct lttng_session
*session
= container
->session
;
1005 struct lttng_event
*event
;
1007 if (key_string
[0]) {
1008 struct hlist_head
*head
;
1010 head
= utils_borrow_hash_table_bucket(session
->events_key_ht
.table
,
1011 LTTNG_EVENT_HT_SIZE
, key_string
);
1012 lttng_hlist_for_each_entry(event
, head
, key_hlist
) {
1013 if (!strcmp(key_string
, event
->key
)) {
1014 /* Same key, use same id. */
1021 if (lttng_event_container_current_id_full(container
)) {
1025 switch (container
->type
) {
1026 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1028 struct lttng_channel
*channel
= lttng_event_container_get_channel(container
);
1029 *id
= channel
->free_event_id
++;
1032 case LTTNG_EVENT_CONTAINER_COUNTER
:
1034 struct lttng_counter
*counter
= lttng_event_container_get_counter(container
);
1035 *id
= counter
->free_index
++;
1047 int format_event_key(char *key_string
, const struct lttng_counter_key
*key
,
1048 const char *event_name
)
1050 const struct lttng_counter_key_dimension
*dim
;
1051 size_t i
, left
= LTTNG_KEY_TOKEN_STRING_LEN_MAX
;
1053 key_string
[0] = '\0';
1054 if (!key
|| !key
->nr_dimensions
)
1056 /* Currently event keys can only be specified on a single dimension. */
1057 if (key
->nr_dimensions
!= 1)
1059 dim
= &key
->key_dimensions
[0];
1060 for (i
= 0; i
< dim
->nr_key_tokens
; i
++) {
1061 const struct lttng_key_token
*token
= &dim
->key_tokens
[i
];
1065 switch (token
->type
) {
1066 case LTTNG_KEY_TOKEN_STRING
:
1067 str
= token
->arg
.string
;
1069 case LTTNG_KEY_TOKEN_EVENT_NAME
:
1075 token_len
= strlen(str
);
1076 if (token_len
>= left
)
1078 strcat(key_string
, str
);
1085 bool match_event_token(struct lttng_event_container
*container
,
1086 struct lttng_event
*event
, uint64_t token
)
1088 if (container
->coalesce_hits
)
1090 if (event
->user_token
== token
)
1096 int lttng_counter_append_descriptor(struct lttng_counter
*counter
,
1097 uint64_t user_token
,
1101 struct lttng_counter_map
*map
= &counter
->map
;
1102 struct lttng_counter_map_descriptor
*last
;
1105 if (strlen(key
) >= LTTNG_KERNEL_COUNTER_KEY_LEN
) {
1109 mutex_lock(&map
->lock
);
1110 if (map
->nr_descriptors
== map
->alloc_len
) {
1111 struct lttng_counter_map_descriptor
*new_table
, *old_table
;
1112 size_t old_len
= map
->nr_descriptors
;
1113 size_t new_len
= max_t(size_t, old_len
+ 1, map
->alloc_len
* 2);
1115 old_table
= map
->descriptors
;
1116 new_table
= lttng_kvzalloc(sizeof(struct lttng_counter_map_descriptor
) * new_len
,
1124 memcpy(new_table
, old_table
, old_len
* sizeof(struct lttng_counter_map_descriptor
));
1126 map
->descriptors
= new_table
;
1127 map
->alloc_len
= new_len
;
1128 lttng_kvfree(old_table
);
1130 last
= &map
->descriptors
[map
->nr_descriptors
++];
1131 last
->user_token
= user_token
;
1132 last
->array_index
= index
;
1133 strcpy(last
->key
, key
);
1135 mutex_unlock(&map
->lock
);
1140 * Supports event creation while tracing session is active.
1141 * Needs to be called with sessions mutex held.
1143 struct lttng_event
*_lttng_event_create(struct lttng_event_container
*container
,
1144 struct lttng_kernel_event
*event_param
,
1145 const struct lttng_counter_key
*key
,
1147 const struct lttng_event_desc
*event_desc
,
1148 enum lttng_kernel_instrumentation itype
,
1151 struct lttng_session
*session
;
1152 struct lttng_event
*event
;
1153 char event_name
[LTTNG_KERNEL_SYM_NAME_LEN
];
1154 struct hlist_head
*name_head
, *key_head
;
1155 char key_string
[LTTNG_KEY_TOKEN_STRING_LEN_MAX
];
1158 session
= container
->session
;
1160 case LTTNG_KERNEL_TRACEPOINT
:
1161 if (strlen(event_desc
->name
) >= LTTNG_KERNEL_SYM_NAME_LEN
) {
1165 strcpy(event_name
, event_desc
->name
);
1167 case LTTNG_KERNEL_KPROBE
:
1168 case LTTNG_KERNEL_UPROBE
:
1169 case LTTNG_KERNEL_SYSCALL
:
1170 if (strlen(event_param
->name
) >= LTTNG_KERNEL_SYM_NAME_LEN
) {
1174 strcpy(event_name
, event_param
->name
);
1176 case LTTNG_KERNEL_KRETPROBE
:
1177 if (strlen(event_param
->name
) >= LTTNG_KERNEL_SYM_NAME_LEN
) {
1181 strcpy(event_name
, event_param
->name
);
1182 if (strlen(event_name
) + strlen("_entry") >= LTTNG_KERNEL_SYM_NAME_LEN
) {
1186 strcat(event_name
, "_entry");
1188 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
1189 case LTTNG_KERNEL_NOOP
: /* Fall-through. */
1196 if (format_event_key(key_string
, key
, event_name
)) {
1201 name_head
= utils_borrow_hash_table_bucket(session
->events_name_ht
.table
,
1202 LTTNG_EVENT_HT_SIZE
, event_name
);
1203 lttng_hlist_for_each_entry(event
, name_head
, name_hlist
) {
1204 bool same_event
= false, same_container
= false, same_key
= false,
1207 WARN_ON_ONCE(!event
->desc
);
1209 if (event
->desc
== event_desc
)
1212 if (!strcmp(event_name
, event
->desc
->name
))
1215 if (container
== event
->container
) {
1216 same_container
= true;
1217 if (match_event_token(container
, event
, token
))
1220 if (key_string
[0] == '\0' || !strcmp(key_string
, event
->key
))
1222 if (same_event
&& same_container
&& same_key
&& same_token
) {
1228 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
1233 event
->container
= container
;
1234 event
->filter
= filter
;
1235 event
->instrumentation
= itype
;
1236 event
->evtype
= LTTNG_TYPE_EVENT
;
1237 if (!container
->coalesce_hits
)
1238 event
->user_token
= token
;
1239 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
1240 INIT_LIST_HEAD(&event
->enablers_ref_head
);
1241 if (lttng_event_container_allocate_id(container
, key_string
,
1246 if (key_string
[0]) {
1247 key_head
= utils_borrow_hash_table_bucket(session
->events_key_ht
.table
,
1248 LTTNG_EVENT_HT_SIZE
, key_string
);
1249 hlist_add_head(&event
->key_hlist
, key_head
);
1251 strcpy(event
->key
, key_string
);
1254 case LTTNG_KERNEL_TRACEPOINT
:
1255 /* Event will be enabled by enabler sync. */
1257 event
->registered
= 0;
1258 event
->desc
= lttng_event_desc_get(event_name
);
1261 goto register_error
;
1263 /* Populate lttng_event structure before event registration. */
1266 case LTTNG_KERNEL_KPROBE
:
1268 * Needs to be explicitly enabled after creation, since
1269 * we may want to apply filters.
1272 event
->registered
= 1;
1274 * Populate lttng_event structure before event
1278 ret
= lttng_kprobes_register_event(event_name
,
1279 event_param
->u
.kprobe
.symbol_name
,
1280 event_param
->u
.kprobe
.offset
,
1281 event_param
->u
.kprobe
.addr
,
1285 goto register_error
;
1287 event
->u
.kprobe
.user_token
= token
;
1288 ret
= try_module_get(event
->desc
->owner
);
1291 /* Append descriptor to counter. */
1292 switch (container
->type
) {
1293 case LTTNG_EVENT_CONTAINER_COUNTER
:
1295 struct lttng_counter
*counter
;
1296 const char *name
= "<UNKNOWN>";
1299 counter
= lttng_event_container_get_counter(container
);
1304 ret
= lttng_counter_append_descriptor(counter
,
1312 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1317 case LTTNG_KERNEL_KRETPROBE
:
1319 struct lttng_event
*event_return
;
1321 /* kretprobe defines 2 events */
1323 * Needs to be explicitly enabled after creation, since
1324 * we may want to apply filters.
1327 event
->registered
= 1;
1328 event
->u
.kretprobe
.user_token
= token
;
1330 /* Append descriptor to counter. */
1331 switch (container
->type
) {
1332 case LTTNG_EVENT_CONTAINER_COUNTER
:
1334 struct lttng_counter
*counter
;
1335 const char *name
= "<UNKNOWN>";
1338 counter
= lttng_event_container_get_counter(container
);
1343 ret
= lttng_counter_append_descriptor(counter
,
1351 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1357 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
1358 if (!event_return
) {
1360 goto register_error
;
1362 event_return
->container
= container
;
1363 event_return
->filter
= filter
;
1365 strcpy(event_name
, event_param
->name
);
1366 if (strlen(event_name
) + strlen("_return") >= LTTNG_KERNEL_SYM_NAME_LEN
) {
1368 goto register_error
;
1370 strcat(event_name
, "_return");
1371 if (format_event_key(key_string
, key
, event_name
)) {
1373 goto register_error
;
1375 if (lttng_event_container_allocate_id(container
, key_string
, &event_return
->id
)) {
1376 kmem_cache_free(event_cache
, event_return
);
1378 goto register_error
;
1380 key_head
= utils_borrow_hash_table_bucket(session
->events_key_ht
.table
,
1381 LTTNG_EVENT_HT_SIZE
, key_string
);
1382 hlist_add_head(&event_return
->key_hlist
, key_head
);
1383 event_return
->enabled
= 0;
1384 event_return
->registered
= 1;
1385 event_return
->instrumentation
= itype
;
1386 INIT_LIST_HEAD(&event_return
->filter_bytecode_runtime_head
);
1387 INIT_LIST_HEAD(&event_return
->enablers_ref_head
);
1388 event_return
->u
.kretprobe
.user_token
= token
;
1389 strcpy(event_return
->key
, key_string
);
1391 * Populate lttng_event structure before kretprobe registration.
1394 ret
= lttng_kretprobes_register(event_name
,
1395 event_param
->u
.kretprobe
.symbol_name
,
1396 event_param
->u
.kretprobe
.offset
,
1397 event_param
->u
.kretprobe
.addr
,
1398 event
, event_return
);
1400 kmem_cache_free(event_cache
, event_return
);
1402 goto register_error
;
1404 /* Take 2 refs on the module: one per event. */
1405 ret
= try_module_get(event
->desc
->owner
);
1407 ret
= try_module_get(event
->desc
->owner
);
1410 /* Append exit descriptor to counter. */
1411 switch (container
->type
) {
1412 case LTTNG_EVENT_CONTAINER_COUNTER
:
1414 struct lttng_counter
*counter
;
1415 const char *name
= "<UNKNOWN>";
1418 counter
= lttng_event_container_get_counter(container
);
1419 if (event_return
->key
[0])
1420 name
= event_return
->key
;
1423 ret
= lttng_counter_append_descriptor(counter
,
1424 token
, event_return
->id
,
1431 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1435 switch (container
->type
) {
1436 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1437 ret
= _lttng_event_metadata_statedump(session
, event_return
);
1438 WARN_ON_ONCE(ret
> 0);
1440 kmem_cache_free(event_cache
, event_return
);
1441 module_put(event
->desc
->owner
);
1442 module_put(event
->desc
->owner
);
1443 goto statedump_error
;
1446 case LTTNG_EVENT_CONTAINER_COUNTER
:
1450 list_add(&event_return
->list
, &session
->events
);
1453 case LTTNG_KERNEL_SYSCALL
:
1455 * Needs to be explicitly enabled after creation, since
1456 * we may want to apply filters.
1459 event
->registered
= 0;
1460 event
->desc
= event_desc
;
1461 switch (event_param
->u
.syscall
.entryexit
) {
1462 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1464 goto register_error
;
1465 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1466 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1468 case LTTNG_KERNEL_SYSCALL_EXIT
:
1469 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1472 switch (event_param
->u
.syscall
.abi
) {
1473 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1475 goto register_error
;
1476 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1477 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1479 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1480 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1485 goto register_error
;
1488 case LTTNG_KERNEL_UPROBE
:
1490 * Needs to be explicitly enabled after creation, since
1491 * we may want to apply filters.
1494 event
->registered
= 1;
1495 event
->u
.uprobe
.user_token
= token
;
1498 * Populate lttng_event structure before event
1503 ret
= lttng_uprobes_register_event(event_name
,
1504 event_param
->u
.uprobe
.fd
,
1507 goto register_error
;
1508 ret
= try_module_get(event
->desc
->owner
);
1511 /* Append descriptor to counter. */
1512 switch (container
->type
) {
1513 case LTTNG_EVENT_CONTAINER_COUNTER
:
1515 struct lttng_counter
*counter
;
1516 const char *name
= "<UNKNOWN>";
1519 counter
= lttng_event_container_get_counter(container
);
1524 ret
= lttng_counter_append_descriptor(counter
,
1532 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1537 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
1538 case LTTNG_KERNEL_NOOP
: /* Fall-through.*/
1542 goto register_error
;
1544 switch (container
->type
) {
1545 case LTTNG_EVENT_CONTAINER_CHANNEL
:
1546 ret
= _lttng_event_metadata_statedump(session
, event
);
1547 WARN_ON_ONCE(ret
> 0);
1549 goto statedump_error
;
1552 case LTTNG_EVENT_CONTAINER_COUNTER
:
1556 hlist_add_head(&event
->name_hlist
, name_head
);
1557 list_add(&event
->list
, &session
->events
);
1561 /* If a statedump error occurs, events will not be readable. */
1564 kmem_cache_free(event_cache
, event
);
1568 return ERR_PTR(ret
);
1571 struct lttng_event_notifier
*_lttng_event_notifier_create(
1572 const struct lttng_event_desc
*event_desc
,
1573 uint64_t token
, uint64_t error_counter_index
,
1574 struct lttng_event_notifier_group
*event_notifier_group
,
1575 struct lttng_kernel_event_notifier
*event_notifier_param
,
1576 void *filter
, enum lttng_kernel_instrumentation itype
)
1578 struct lttng_event_notifier
*event_notifier
;
1579 struct lttng_counter
*error_counter
;
1580 const char *event_name
;
1581 struct hlist_head
*head
;
1585 case LTTNG_KERNEL_TRACEPOINT
:
1586 event_name
= event_desc
->name
;
1588 case LTTNG_KERNEL_KPROBE
:
1589 case LTTNG_KERNEL_UPROBE
:
1590 case LTTNG_KERNEL_SYSCALL
:
1591 event_name
= event_notifier_param
->event
.name
;
1593 case LTTNG_KERNEL_KRETPROBE
:
1594 case LTTNG_KERNEL_FUNCTION
:
1595 case LTTNG_KERNEL_NOOP
:
1602 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1603 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1604 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1605 WARN_ON_ONCE(!event_notifier
->desc
);
1606 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1607 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1608 && event_notifier_group
== event_notifier
->group
1609 && token
== event_notifier
->user_token
) {
1615 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1616 if (!event_notifier
) {
1621 event_notifier
->group
= event_notifier_group
;
1622 event_notifier
->user_token
= token
;
1623 event_notifier
->error_counter_index
= error_counter_index
;
1624 event_notifier
->num_captures
= 0;
1625 event_notifier
->filter
= filter
;
1626 event_notifier
->instrumentation
= itype
;
1627 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1628 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1629 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1630 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1631 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1634 case LTTNG_KERNEL_TRACEPOINT
:
1635 /* Event will be enabled by enabler sync. */
1636 event_notifier
->enabled
= 0;
1637 event_notifier
->registered
= 0;
1638 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1639 if (!event_notifier
->desc
) {
1641 goto register_error
;
1643 /* Populate lttng_event_notifier structure before event registration. */
1646 case LTTNG_KERNEL_KPROBE
:
1648 * Needs to be explicitly enabled after creation, since
1649 * we may want to apply filters.
1651 event_notifier
->enabled
= 0;
1652 event_notifier
->registered
= 1;
1654 * Populate lttng_event_notifier structure before event
1658 ret
= lttng_kprobes_register_event_notifier(
1659 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1660 event_notifier_param
->event
.u
.kprobe
.offset
,
1661 event_notifier_param
->event
.u
.kprobe
.addr
,
1665 goto register_error
;
1667 ret
= try_module_get(event_notifier
->desc
->owner
);
1670 case LTTNG_KERNEL_NOOP
:
1671 case LTTNG_KERNEL_SYSCALL
:
1673 * Needs to be explicitly enabled after creation, since
1674 * we may want to apply filters.
1676 event_notifier
->enabled
= 0;
1677 event_notifier
->registered
= 0;
1678 event_notifier
->desc
= event_desc
;
1679 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1680 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1682 goto register_error
;
1683 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1684 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1686 case LTTNG_KERNEL_SYSCALL_EXIT
:
1687 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1690 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1691 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1693 goto register_error
;
1694 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1695 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1697 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1698 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1702 if (!event_notifier
->desc
) {
1704 goto register_error
;
1707 case LTTNG_KERNEL_UPROBE
:
1709 * Needs to be explicitly enabled after creation, since
1710 * we may want to apply filters.
1712 event_notifier
->enabled
= 0;
1713 event_notifier
->registered
= 1;
1716 * Populate lttng_event_notifier structure before
1717 * event_notifier registration.
1721 ret
= lttng_uprobes_register_event_notifier(
1722 event_notifier_param
->event
.name
,
1723 event_notifier_param
->event
.u
.uprobe
.fd
,
1726 goto register_error
;
1727 ret
= try_module_get(event_notifier
->desc
->owner
);
1730 case LTTNG_KERNEL_KRETPROBE
:
1731 case LTTNG_KERNEL_FUNCTION
:
1735 goto register_error
;
1738 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1739 hlist_add_head(&event_notifier
->hlist
, head
);
1742 * Clear the error counter bucket. The sessiond keeps track of which
1743 * bucket is currently in use. We trust it. The session lock
1744 * synchronizes against concurrent creation of the error
1747 error_counter
= event_notifier_group
->error_counter
;
1748 if (error_counter
) {
1749 size_t dimension_index
[1];
1752 * Check that the index is within the boundary of the counter.
1754 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1755 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1756 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1758 goto register_error
;
1761 dimension_index
[0] = event_notifier
->error_counter_index
;
1762 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1764 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1765 event_notifier
->error_counter_index
);
1766 goto register_error
;
1770 return event_notifier
;
1773 kmem_cache_free(event_notifier_cache
, event_notifier
);
1777 return ERR_PTR(ret
);
1780 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1781 const size_t *dim_indexes
, int32_t cpu
,
1782 int64_t *val
, bool *overflow
, bool *underflow
)
1784 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1785 cpu
, val
, overflow
, underflow
);
1788 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1789 const size_t *dim_indexes
, int64_t *val
,
1790 bool *overflow
, bool *underflow
)
1792 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1793 val
, overflow
, underflow
);
1796 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1797 const size_t *dim_indexes
)
1799 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1802 struct lttng_event
*lttng_event_create(struct lttng_event_container
*container
,
1803 struct lttng_kernel_event
*event_param
,
1804 const struct lttng_counter_key
*key
,
1806 const struct lttng_event_desc
*event_desc
,
1807 enum lttng_kernel_instrumentation itype
,
1810 struct lttng_event
*event
;
1812 mutex_lock(&sessions_mutex
);
1813 event
= _lttng_event_create(container
, event_param
, key
, filter
, event_desc
,
1815 mutex_unlock(&sessions_mutex
);
1819 struct lttng_event_notifier
*lttng_event_notifier_create(
1820 const struct lttng_event_desc
*event_desc
,
1821 uint64_t id
, uint64_t error_counter_index
,
1822 struct lttng_event_notifier_group
*event_notifier_group
,
1823 struct lttng_kernel_event_notifier
*event_notifier_param
,
1824 void *filter
, enum lttng_kernel_instrumentation itype
)
1826 struct lttng_event_notifier
*event_notifier
;
1828 mutex_lock(&sessions_mutex
);
1829 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1830 error_counter_index
, event_notifier_group
,
1831 event_notifier_param
, filter
, itype
);
1832 mutex_unlock(&sessions_mutex
);
1833 return event_notifier
;
1836 /* Only used for tracepoints for now. */
1838 void register_event(struct lttng_event
*event
)
1840 const struct lttng_event_desc
*desc
;
1843 if (event
->registered
)
1847 switch (event
->instrumentation
) {
1848 case LTTNG_KERNEL_TRACEPOINT
:
1849 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1850 desc
->probe_callback
, event
);
1852 case LTTNG_KERNEL_SYSCALL
:
1853 ret
= lttng_syscall_filter_enable_event(event
->container
, event
);
1855 case LTTNG_KERNEL_KPROBE
:
1856 case LTTNG_KERNEL_UPROBE
:
1857 case LTTNG_KERNEL_KRETPROBE
:
1858 case LTTNG_KERNEL_NOOP
:
1861 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1866 event
->registered
= 1;
1870 * Only used internally at session destruction.
1872 int _lttng_event_unregister(struct lttng_event
*event
)
1874 const struct lttng_event_desc
*desc
;
1877 if (!event
->registered
)
1881 switch (event
->instrumentation
) {
1882 case LTTNG_KERNEL_TRACEPOINT
:
1883 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1884 event
->desc
->probe_callback
, event
);
1886 case LTTNG_KERNEL_KPROBE
:
1887 lttng_kprobes_unregister_event(event
);
1890 case LTTNG_KERNEL_KRETPROBE
:
1891 lttng_kretprobes_unregister(event
);
1894 case LTTNG_KERNEL_SYSCALL
:
1895 ret
= lttng_syscall_filter_disable_event(event
->container
, event
);
1897 case LTTNG_KERNEL_NOOP
:
1900 case LTTNG_KERNEL_UPROBE
:
1901 lttng_uprobes_unregister_event(event
);
1904 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1909 event
->registered
= 0;
1913 /* Only used for tracepoints for now. */
1915 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1917 const struct lttng_event_desc
*desc
;
1920 if (event_notifier
->registered
)
1923 desc
= event_notifier
->desc
;
1924 switch (event_notifier
->instrumentation
) {
1925 case LTTNG_KERNEL_TRACEPOINT
:
1926 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1927 desc
->event_notifier_callback
,
1930 case LTTNG_KERNEL_SYSCALL
:
1931 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1933 case LTTNG_KERNEL_KPROBE
:
1934 case LTTNG_KERNEL_UPROBE
:
1937 case LTTNG_KERNEL_KRETPROBE
:
1938 case LTTNG_KERNEL_FUNCTION
:
1939 case LTTNG_KERNEL_NOOP
:
1944 event_notifier
->registered
= 1;
1948 int _lttng_event_notifier_unregister(
1949 struct lttng_event_notifier
*event_notifier
)
1951 const struct lttng_event_desc
*desc
;
1954 if (!event_notifier
->registered
)
1957 desc
= event_notifier
->desc
;
1958 switch (event_notifier
->instrumentation
) {
1959 case LTTNG_KERNEL_TRACEPOINT
:
1960 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1961 event_notifier
->desc
->event_notifier_callback
,
1964 case LTTNG_KERNEL_KPROBE
:
1965 lttng_kprobes_unregister_event_notifier(event_notifier
);
1968 case LTTNG_KERNEL_UPROBE
:
1969 lttng_uprobes_unregister_event_notifier(event_notifier
);
1972 case LTTNG_KERNEL_SYSCALL
:
1973 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1975 case LTTNG_KERNEL_KRETPROBE
:
1976 case LTTNG_KERNEL_FUNCTION
:
1977 case LTTNG_KERNEL_NOOP
:
1982 event_notifier
->registered
= 0;
1987 * Only used internally at session destruction.
1990 void _lttng_event_destroy(struct lttng_event
*event
)
1992 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1994 switch (event
->instrumentation
) {
1995 case LTTNG_KERNEL_TRACEPOINT
:
1996 lttng_event_desc_put(event
->desc
);
1998 case LTTNG_KERNEL_KPROBE
:
1999 module_put(event
->desc
->owner
);
2000 lttng_kprobes_destroy_event_private(event
);
2002 case LTTNG_KERNEL_KRETPROBE
:
2003 module_put(event
->desc
->owner
);
2004 lttng_kretprobes_destroy_private(event
);
2006 case LTTNG_KERNEL_NOOP
:
2007 case LTTNG_KERNEL_SYSCALL
:
2009 case LTTNG_KERNEL_UPROBE
:
2010 module_put(event
->desc
->owner
);
2011 lttng_uprobes_destroy_event_private(event
);
2013 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
2017 list_del(&event
->list
);
2018 lttng_destroy_context(event
->ctx
);
2019 lttng_free_event_filter_runtime(event
);
2020 /* Free event enabler refs */
2021 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
2022 &event
->enablers_ref_head
, node
)
2024 kmem_cache_free(event_cache
, event
);
2028 * Only used internally at session destruction.
2031 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
2033 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
2035 switch (event_notifier
->instrumentation
) {
2036 case LTTNG_KERNEL_TRACEPOINT
:
2037 lttng_event_desc_put(event_notifier
->desc
);
2039 case LTTNG_KERNEL_KPROBE
:
2040 module_put(event_notifier
->desc
->owner
);
2041 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
2043 case LTTNG_KERNEL_NOOP
:
2044 case LTTNG_KERNEL_SYSCALL
:
2046 case LTTNG_KERNEL_UPROBE
:
2047 module_put(event_notifier
->desc
->owner
);
2048 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
2050 case LTTNG_KERNEL_KRETPROBE
:
2051 case LTTNG_KERNEL_FUNCTION
:
2055 list_del(&event_notifier
->list
);
2056 lttng_free_event_notifier_filter_runtime(event_notifier
);
2057 /* Free event enabler refs */
2058 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
2059 &event_notifier
->enablers_ref_head
, node
)
2061 kmem_cache_free(event_notifier_cache
, event_notifier
);
2064 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
2065 enum tracker_type tracker_type
)
2067 switch (tracker_type
) {
2069 return &session
->pid_tracker
;
2071 return &session
->vpid_tracker
;
2073 return &session
->uid_tracker
;
2075 return &session
->vuid_tracker
;
2077 return &session
->gid_tracker
;
2079 return &session
->vgid_tracker
;
2086 int lttng_session_track_id(struct lttng_session
*session
,
2087 enum tracker_type tracker_type
, int id
)
2089 struct lttng_id_tracker
*tracker
;
2092 tracker
= get_tracker(session
, tracker_type
);
2097 mutex_lock(&sessions_mutex
);
2099 /* track all ids: destroy tracker. */
2100 lttng_id_tracker_destroy(tracker
, true);
2103 ret
= lttng_id_tracker_add(tracker
, id
);
2105 mutex_unlock(&sessions_mutex
);
2109 int lttng_session_untrack_id(struct lttng_session
*session
,
2110 enum tracker_type tracker_type
, int id
)
2112 struct lttng_id_tracker
*tracker
;
2115 tracker
= get_tracker(session
, tracker_type
);
2120 mutex_lock(&sessions_mutex
);
2122 /* untrack all ids: replace by empty tracker. */
2123 ret
= lttng_id_tracker_empty_set(tracker
);
2125 ret
= lttng_id_tracker_del(tracker
, id
);
2127 mutex_unlock(&sessions_mutex
);
2132 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
2134 struct lttng_id_tracker
*id_tracker
= m
->private;
2135 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
2136 struct lttng_id_hash_node
*e
;
2139 mutex_lock(&sessions_mutex
);
2141 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
2142 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
2144 lttng_hlist_for_each_entry(e
, head
, hlist
) {
2150 /* ID tracker disabled. */
2151 if (iter
>= *pos
&& iter
== 0) {
2152 return id_tracker_p
; /* empty tracker */
2160 /* Called with sessions_mutex held. */
2162 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
2164 struct lttng_id_tracker
*id_tracker
= m
->private;
2165 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
2166 struct lttng_id_hash_node
*e
;
2171 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
2172 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
2174 lttng_hlist_for_each_entry(e
, head
, hlist
) {
2175 if (iter
++ >= *ppos
)
2180 /* ID tracker disabled. */
2181 if (iter
>= *ppos
&& iter
== 0)
2182 return p
; /* empty tracker */
2191 void id_list_stop(struct seq_file
*m
, void *p
)
2193 mutex_unlock(&sessions_mutex
);
2197 int id_list_show(struct seq_file
*m
, void *p
)
2199 struct lttng_id_tracker
*id_tracker
= m
->private;
2200 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
2203 if (p
== id_tracker_p
) {
2204 /* Tracker disabled. */
2207 const struct lttng_id_hash_node
*e
= p
;
2209 id
= lttng_id_tracker_get_node_id(e
);
2211 switch (id_tracker
->tracker_type
) {
2213 seq_printf(m
, "process { pid = %d; };\n", id
);
2216 seq_printf(m
, "process { vpid = %d; };\n", id
);
2219 seq_printf(m
, "user { uid = %d; };\n", id
);
2222 seq_printf(m
, "user { vuid = %d; };\n", id
);
2225 seq_printf(m
, "group { gid = %d; };\n", id
);
2228 seq_printf(m
, "group { vgid = %d; };\n", id
);
2231 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
2237 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
2238 .start
= id_list_start
,
2239 .next
= id_list_next
,
2240 .stop
= id_list_stop
,
2241 .show
= id_list_show
,
2245 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
2247 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
2251 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
2253 struct seq_file
*m
= file
->private_data
;
2254 struct lttng_id_tracker
*id_tracker
= m
->private;
2257 WARN_ON_ONCE(!id_tracker
);
2258 ret
= seq_release(inode
, file
);
2260 fput(id_tracker
->session
->file
);
2264 const struct file_operations lttng_tracker_ids_list_fops
= {
2265 .owner
= THIS_MODULE
,
2266 .open
= lttng_tracker_ids_list_open
,
2268 .llseek
= seq_lseek
,
2269 .release
= lttng_tracker_ids_list_release
,
2272 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
2273 enum tracker_type tracker_type
)
2275 struct file
*tracker_ids_list_file
;
2279 file_fd
= lttng_get_unused_fd();
2285 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
2286 <tng_tracker_ids_list_fops
,
2288 if (IS_ERR(tracker_ids_list_file
)) {
2289 ret
= PTR_ERR(tracker_ids_list_file
);
2292 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
2294 goto refcount_error
;
2296 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
2299 m
= tracker_ids_list_file
->private_data
;
2301 m
->private = get_tracker(session
, tracker_type
);
2302 BUG_ON(!m
->private);
2303 fd_install(file_fd
, tracker_ids_list_file
);
2308 atomic_long_dec(&session
->file
->f_count
);
2310 fput(tracker_ids_list_file
);
2312 put_unused_fd(file_fd
);
2318 * Enabler management.
2321 int lttng_match_enabler_star_glob(const char *desc_name
,
2322 const char *pattern
)
2324 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
2325 desc_name
, LTTNG_SIZE_MAX
))
2331 int lttng_match_enabler_name(const char *desc_name
,
2334 if (strcmp(desc_name
, name
))
2339 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
2340 struct lttng_enabler
*enabler
)
2342 const char *desc_name
, *enabler_name
;
2343 bool compat
= false, entry
= false;
2345 enabler_name
= enabler
->event_param
.name
;
2346 switch (enabler
->event_param
.instrumentation
) {
2347 case LTTNG_KERNEL_TRACEPOINT
:
2348 desc_name
= desc
->name
;
2349 switch (enabler
->format_type
) {
2350 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2351 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2352 case LTTNG_ENABLER_FORMAT_NAME
:
2353 return lttng_match_enabler_name(desc_name
, enabler_name
);
2358 case LTTNG_KERNEL_SYSCALL
:
2359 desc_name
= desc
->name
;
2360 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2361 desc_name
+= strlen("compat_");
2364 if (!strncmp(desc_name
, "syscall_exit_",
2365 strlen("syscall_exit_"))) {
2366 desc_name
+= strlen("syscall_exit_");
2367 } else if (!strncmp(desc_name
, "syscall_entry_",
2368 strlen("syscall_entry_"))) {
2369 desc_name
+= strlen("syscall_entry_");
2375 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2376 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
2378 case LTTNG_KERNEL_SYSCALL_ENTRY
:
2382 case LTTNG_KERNEL_SYSCALL_EXIT
:
2389 switch (enabler
->event_param
.u
.syscall
.abi
) {
2390 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
2392 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
2396 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
2403 switch (enabler
->event_param
.u
.syscall
.match
) {
2404 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
2405 switch (enabler
->format_type
) {
2406 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2407 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2408 case LTTNG_ENABLER_FORMAT_NAME
:
2409 return lttng_match_enabler_name(desc_name
, enabler_name
);
2414 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
2415 return -EINVAL
; /* Not implemented. */
2427 bool lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2428 struct lttng_event
*event
)
2430 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2433 if (base_enabler
->event_param
.instrumentation
== event
->instrumentation
2434 && lttng_desc_match_enabler(event
->desc
, base_enabler
) > 0
2435 && event
->container
== event_enabler
->container
2436 && match_event_token(event
->container
, event
, event_enabler
->base
.user_token
))
2443 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2444 struct lttng_event_notifier
*event_notifier
)
2446 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2447 event_notifier_enabler
);
2449 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
2451 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
) > 0
2452 && event_notifier
->group
== event_notifier_enabler
->group
2453 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2460 struct lttng_enabler_ref
*lttng_enabler_ref(
2461 struct list_head
*enablers_ref_list
,
2462 struct lttng_enabler
*enabler
)
2464 struct lttng_enabler_ref
*enabler_ref
;
2466 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2467 if (enabler_ref
->ref
== enabler
)
2474 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2476 struct lttng_probe_desc
*probe_desc
;
2477 const struct lttng_event_desc
*desc
;
2479 struct list_head
*probe_list
;
2481 probe_list
= lttng_get_probe_list_head();
2483 * For each probe event, if we find that a probe event matches
2484 * our enabler, create an associated lttng_event if not
2487 list_for_each_entry(probe_desc
, probe_list
, head
) {
2488 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2489 struct lttng_event
*event
;
2491 desc
= probe_desc
->event_desc
[i
];
2492 if (lttng_desc_match_enabler(desc
,
2493 lttng_event_enabler_as_enabler(event_enabler
)) <= 0)
2496 /* Try to create an event for this event probe. */
2497 event
= _lttng_event_create(event_enabler
->container
,
2498 NULL
, &event_enabler
->key
, NULL
, desc
,
2499 LTTNG_KERNEL_TRACEPOINT
,
2500 event_enabler
->base
.user_token
);
2501 /* Skip if event is already found. */
2502 if (IS_ERR(event
) && PTR_ERR(event
) == -EEXIST
)
2504 if (IS_ERR(event
)) {
2505 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2506 probe_desc
->event_desc
[i
]->name
);
2513 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2515 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2516 struct lttng_probe_desc
*probe_desc
;
2517 const struct lttng_event_desc
*desc
;
2519 struct list_head
*probe_list
;
2521 probe_list
= lttng_get_probe_list_head();
2523 * For each probe event, if we find that a probe event matches
2524 * our enabler, create an associated lttng_event_notifier if not
2527 list_for_each_entry(probe_desc
, probe_list
, head
) {
2528 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2530 struct hlist_head
*head
;
2531 struct lttng_event_notifier
*event_notifier
;
2533 desc
= probe_desc
->event_desc
[i
];
2534 if (lttng_desc_match_enabler(desc
,
2535 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)) <= 0)
2539 * Check if already created.
2541 head
= utils_borrow_hash_table_bucket(
2542 event_notifier_group
->event_notifiers_ht
.table
,
2543 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
2544 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2545 if (event_notifier
->desc
== desc
2546 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2553 * We need to create a event_notifier for this event probe.
2555 event_notifier
= _lttng_event_notifier_create(desc
,
2556 event_notifier_enabler
->base
.user_token
,
2557 event_notifier_enabler
->error_counter_index
,
2558 event_notifier_group
, NULL
, NULL
,
2559 LTTNG_KERNEL_TRACEPOINT
);
2560 if (IS_ERR(event_notifier
)) {
2561 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2562 probe_desc
->event_desc
[i
]->name
);
2569 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2573 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2578 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2582 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2584 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2589 * Create struct lttng_event if it is missing and present in the list of
2590 * tracepoint probes.
2591 * Should be called with sessions mutex held.
2594 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2596 switch (event_enabler
->base
.event_param
.instrumentation
) {
2597 case LTTNG_KERNEL_TRACEPOINT
:
2598 lttng_create_tracepoint_event_if_missing(event_enabler
);
2600 case LTTNG_KERNEL_SYSCALL
:
2601 lttng_create_syscall_event_if_missing(event_enabler
);
2610 * Create events associated with an event_enabler (if not already present),
2611 * and add backward reference from the event to the enabler.
2612 * Should be called with sessions mutex held.
2615 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2617 struct lttng_event_container
*container
= event_enabler
->container
;
2618 struct lttng_session
*session
= container
->session
;
2619 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2620 struct lttng_event
*event
;
2622 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2623 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2624 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2625 !strcmp(base_enabler
->event_param
.name
, "*")) {
2626 int enabled
= base_enabler
->enabled
;
2627 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2629 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2630 WRITE_ONCE(container
->syscall_all_entry
, enabled
);
2632 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2633 WRITE_ONCE(container
->syscall_all_exit
, enabled
);
2636 /* First ensure that probe events are created for this enabler. */
2637 lttng_create_event_if_missing(event_enabler
);
2639 /* For each event matching event_enabler in session event list. */
2640 list_for_each_entry(event
, &session
->events
, list
) {
2641 struct lttng_enabler_ref
*enabler_ref
;
2643 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2645 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2646 lttng_event_enabler_as_enabler(event_enabler
));
2649 * If no backward ref, create it.
2650 * Add backward ref from event to event_enabler.
2652 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2655 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2656 list_add(&enabler_ref
->node
,
2657 &event
->enablers_ref_head
);
2658 /* Append descriptor to counter. */
2659 switch (container
->type
) {
2660 case LTTNG_EVENT_CONTAINER_COUNTER
:
2662 struct lttng_counter
*counter
;
2663 const char *name
= "<UNKNOWN>";
2666 counter
= lttng_event_container_get_counter(container
);
2669 else if (event
->desc
&& event
->desc
->name
)
2670 name
= event
->desc
->name
;
2671 ret
= lttng_counter_append_descriptor(counter
,
2672 event_enabler
->base
.user_token
, event
->id
,
2680 case LTTNG_EVENT_CONTAINER_CHANNEL
:
2687 * Link filter bytecodes if not linked yet.
2689 lttng_enabler_link_bytecode(event
->desc
,
2691 &event
->filter_bytecode_runtime_head
,
2692 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2694 /* TODO: merge event context. */
2700 * Create struct lttng_event_notifier if it is missing and present in the list of
2701 * tracepoint probes.
2702 * Should be called with sessions mutex held.
2705 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2707 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2708 case LTTNG_KERNEL_TRACEPOINT
:
2709 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2711 case LTTNG_KERNEL_SYSCALL
:
2712 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2721 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2724 int lttng_event_notifier_enabler_ref_event_notifiers(
2725 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2727 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2728 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2729 struct lttng_event_notifier
*event_notifier
;
2731 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2732 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2733 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2734 !strcmp(base_enabler
->event_param
.name
, "*")) {
2736 int enabled
= base_enabler
->enabled
;
2737 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2739 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2740 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2742 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2743 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2747 /* First ensure that probe event_notifiers are created for this enabler. */
2748 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2750 /* Link the created event_notifier with its associated enabler. */
2751 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2752 struct lttng_enabler_ref
*enabler_ref
;
2754 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2757 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2758 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2761 * If no backward ref, create it.
2762 * Add backward ref from event_notifier to enabler.
2764 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2768 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2769 event_notifier_enabler
);
2770 list_add(&enabler_ref
->node
,
2771 &event_notifier
->enablers_ref_head
);
2775 * Link filter bytecodes if not linked yet.
2777 lttng_enabler_link_bytecode(event_notifier
->desc
,
2778 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2779 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2781 /* Link capture bytecodes if not linked yet. */
2782 lttng_enabler_link_bytecode(event_notifier
->desc
,
2783 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2784 &event_notifier_enabler
->capture_bytecode_head
);
2786 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2792 * Called at module load: connect the probe on all enablers matching
2794 * Called with sessions lock held.
2796 int lttng_fix_pending_events(void)
2798 struct lttng_session
*session
;
2800 list_for_each_entry(session
, &sessions
, list
)
2801 lttng_session_lazy_sync_event_enablers(session
);
2805 static bool lttng_event_notifier_group_has_active_event_notifiers(
2806 struct lttng_event_notifier_group
*event_notifier_group
)
2808 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2810 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2812 if (event_notifier_enabler
->base
.enabled
)
2818 bool lttng_event_notifier_active(void)
2820 struct lttng_event_notifier_group
*event_notifier_group
;
2822 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2823 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2829 int lttng_fix_pending_event_notifiers(void)
2831 struct lttng_event_notifier_group
*event_notifier_group
;
2833 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2834 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2838 struct lttng_event_enabler
*lttng_event_enabler_create(
2839 enum lttng_enabler_format_type format_type
,
2840 struct lttng_kernel_event
*event_param
,
2841 const struct lttng_counter_key
*key
,
2842 struct lttng_event_container
*container
)
2844 struct lttng_event_enabler
*event_enabler
;
2846 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2849 event_enabler
->base
.format_type
= format_type
;
2850 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2851 memcpy(&event_enabler
->base
.event_param
, event_param
,
2852 sizeof(event_enabler
->base
.event_param
));
2853 event_enabler
->container
= container
;
2855 event_enabler
->base
.enabled
= 0;
2856 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2857 event_enabler
->base
.user_token
= event_param
->token
;
2859 event_enabler
->key
= *key
;
2860 mutex_lock(&sessions_mutex
);
2861 list_add(&event_enabler
->node
, &event_enabler
->container
->session
->enablers_head
);
2862 lttng_session_lazy_sync_event_enablers(event_enabler
->container
->session
);
2863 mutex_unlock(&sessions_mutex
);
2864 return event_enabler
;
2867 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2869 mutex_lock(&sessions_mutex
);
2870 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2871 lttng_session_lazy_sync_event_enablers(event_enabler
->container
->session
);
2872 mutex_unlock(&sessions_mutex
);
2876 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2878 mutex_lock(&sessions_mutex
);
2879 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2880 lttng_session_lazy_sync_event_enablers(event_enabler
->container
->session
);
2881 mutex_unlock(&sessions_mutex
);
2886 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2887 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2889 struct lttng_bytecode_node
*bytecode_node
;
2890 uint32_t bytecode_len
;
2893 ret
= get_user(bytecode_len
, &bytecode
->len
);
2896 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2900 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2901 sizeof(*bytecode
) + bytecode_len
);
2905 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2906 bytecode_node
->enabler
= enabler
;
2907 /* Enforce length based on allocated size */
2908 bytecode_node
->bc
.len
= bytecode_len
;
2909 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2914 lttng_kvfree(bytecode_node
);
2918 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2919 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2922 ret
= lttng_enabler_attach_filter_bytecode(
2923 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2927 lttng_session_lazy_sync_event_enablers(event_enabler
->container
->session
);
2934 int lttng_event_add_callsite(struct lttng_event
*event
,
2935 struct lttng_kernel_event_callsite __user
*callsite
)
2938 switch (event
->instrumentation
) {
2939 case LTTNG_KERNEL_UPROBE
:
2940 return lttng_uprobes_event_add_callsite(event
, callsite
);
2946 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2947 struct lttng_kernel_context
*context_param
)
2953 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2955 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2957 /* Destroy filter bytecode */
2958 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2959 &enabler
->filter_bytecode_head
, node
) {
2960 lttng_kvfree(filter_node
);
2965 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2967 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2969 /* Destroy contexts */
2970 lttng_destroy_context(event_enabler
->ctx
);
2972 list_del(&event_enabler
->node
);
2973 kfree(event_enabler
);
2976 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2977 struct lttng_event_notifier_group
*event_notifier_group
,
2978 enum lttng_enabler_format_type format_type
,
2979 struct lttng_kernel_event_notifier
*event_notifier_param
)
2981 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2983 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2984 if (!event_notifier_enabler
)
2987 event_notifier_enabler
->base
.format_type
= format_type
;
2988 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2989 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2991 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2992 event_notifier_enabler
->num_captures
= 0;
2994 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2995 sizeof(event_notifier_enabler
->base
.event_param
));
2996 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2998 event_notifier_enabler
->base
.enabled
= 0;
2999 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
3000 event_notifier_enabler
->group
= event_notifier_group
;
3002 mutex_lock(&sessions_mutex
);
3003 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
3004 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
3006 mutex_unlock(&sessions_mutex
);
3008 return event_notifier_enabler
;
3011 int lttng_event_notifier_enabler_enable(
3012 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
3014 mutex_lock(&sessions_mutex
);
3015 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
3016 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
3017 mutex_unlock(&sessions_mutex
);
3021 int lttng_event_notifier_enabler_disable(
3022 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
3024 mutex_lock(&sessions_mutex
);
3025 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
3026 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
3027 mutex_unlock(&sessions_mutex
);
3031 int lttng_event_notifier_enabler_attach_filter_bytecode(
3032 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
3033 struct lttng_kernel_filter_bytecode __user
*bytecode
)
3037 ret
= lttng_enabler_attach_filter_bytecode(
3038 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
3043 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
3050 int lttng_event_notifier_enabler_attach_capture_bytecode(
3051 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
3052 struct lttng_kernel_capture_bytecode __user
*bytecode
)
3054 struct lttng_bytecode_node
*bytecode_node
;
3055 struct lttng_enabler
*enabler
=
3056 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
3057 uint32_t bytecode_len
;
3060 ret
= get_user(bytecode_len
, &bytecode
->len
);
3064 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
3069 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
3070 sizeof(*bytecode
) + bytecode_len
);
3074 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
3075 bytecode_node
->enabler
= enabler
;
3077 /* Enforce length based on allocated size */
3078 bytecode_node
->bc
.len
= bytecode_len
;
3079 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
3081 event_notifier_enabler
->num_captures
++;
3083 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
3087 lttng_kvfree(bytecode_node
);
3092 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
3093 struct lttng_kernel_event_callsite __user
*callsite
)
3096 switch (event_notifier
->instrumentation
) {
3097 case LTTNG_KERNEL_UPROBE
:
3098 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
3105 int lttng_event_notifier_enabler_attach_context(
3106 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
3107 struct lttng_kernel_context
*context_param
)
3113 void lttng_event_notifier_enabler_destroy(
3114 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
3116 if (!event_notifier_enabler
) {
3120 list_del(&event_notifier_enabler
->node
);
3122 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
3123 kfree(event_notifier_enabler
);
3127 * lttng_session_sync_event_enablers should be called just before starting a
3129 * Should be called with sessions mutex held.
3132 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
3134 struct lttng_event_enabler
*event_enabler
;
3135 struct lttng_event
*event
;
3137 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
3138 lttng_event_enabler_ref_events(event_enabler
);
3140 * For each event, if at least one of its enablers is enabled,
3141 * and its event container and session transient states are enabled, we
3142 * enable the event, else we disable it.
3144 list_for_each_entry(event
, &session
->events
, list
) {
3145 struct lttng_enabler_ref
*enabler_ref
;
3146 struct lttng_bytecode_runtime
*runtime
;
3147 int enabled
= 0, has_enablers_without_bytecode
= 0;
3149 switch (event
->instrumentation
) {
3150 case LTTNG_KERNEL_TRACEPOINT
:
3151 case LTTNG_KERNEL_SYSCALL
:
3153 list_for_each_entry(enabler_ref
,
3154 &event
->enablers_ref_head
, node
) {
3155 if (enabler_ref
->ref
->enabled
) {
3162 /* Not handled with lazy sync. */
3166 * Enabled state is based on union of enablers, with
3167 * intesection of session and event container transient enable
3170 enabled
= enabled
&& session
->tstate
&& event
->container
->tstate
;
3172 WRITE_ONCE(event
->enabled
, enabled
);
3174 * Sync tracepoint registration with event enabled
3178 register_event(event
);
3180 _lttng_event_unregister(event
);
3183 /* Check if has enablers without bytecode enabled */
3184 list_for_each_entry(enabler_ref
,
3185 &event
->enablers_ref_head
, node
) {
3186 if (enabler_ref
->ref
->enabled
3187 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
3188 has_enablers_without_bytecode
= 1;
3192 event
->has_enablers_without_bytecode
=
3193 has_enablers_without_bytecode
;
3195 /* Enable filters */
3196 list_for_each_entry(runtime
,
3197 &event
->filter_bytecode_runtime_head
, node
)
3198 lttng_bytecode_filter_sync_state(runtime
);
3203 * Apply enablers to session events, adding events to session if need
3204 * be. It is required after each modification applied to an active
3205 * session, and right before session "start".
3206 * "lazy" sync means we only sync if required.
3207 * Should be called with sessions mutex held.
3210 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
3212 /* We can skip if session is not active */
3213 if (!session
->active
)
3215 lttng_session_sync_event_enablers(session
);
3219 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
3221 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
3222 struct lttng_event_notifier
*event_notifier
;
3224 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
3225 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
3228 * For each event_notifier, if at least one of its enablers is enabled,
3229 * we enable the event_notifier, else we disable it.
3231 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
3232 struct lttng_enabler_ref
*enabler_ref
;
3233 struct lttng_bytecode_runtime
*runtime
;
3234 int enabled
= 0, has_enablers_without_bytecode
= 0;
3236 switch (event_notifier
->instrumentation
) {
3237 case LTTNG_KERNEL_TRACEPOINT
:
3238 case LTTNG_KERNEL_SYSCALL
:
3239 /* Enable event_notifiers */
3240 list_for_each_entry(enabler_ref
,
3241 &event_notifier
->enablers_ref_head
, node
) {
3242 if (enabler_ref
->ref
->enabled
) {
3249 /* Not handled with sync. */
3253 WRITE_ONCE(event_notifier
->enabled
, enabled
);
3255 * Sync tracepoint registration with event_notifier enabled
3259 if (!event_notifier
->registered
)
3260 register_event_notifier(event_notifier
);
3262 if (event_notifier
->registered
)
3263 _lttng_event_notifier_unregister(event_notifier
);
3266 /* Check if has enablers without bytecode enabled */
3267 list_for_each_entry(enabler_ref
,
3268 &event_notifier
->enablers_ref_head
, node
) {
3269 if (enabler_ref
->ref
->enabled
3270 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
3271 has_enablers_without_bytecode
= 1;
3275 event_notifier
->has_enablers_without_bytecode
=
3276 has_enablers_without_bytecode
;
3278 /* Enable filters */
3279 list_for_each_entry(runtime
,
3280 &event_notifier
->filter_bytecode_runtime_head
, node
)
3281 lttng_bytecode_filter_sync_state(runtime
);
3283 /* Enable captures */
3284 list_for_each_entry(runtime
,
3285 &event_notifier
->capture_bytecode_runtime_head
, node
)
3286 lttng_bytecode_capture_sync_state(runtime
);
3288 WRITE_ONCE(event_notifier
->eval_capture
, !!event_notifier
->num_captures
);
3293 * Serialize at most one packet worth of metadata into a metadata
3295 * We grab the metadata cache mutex to get exclusive access to our metadata
3296 * buffer and to the metadata cache. Exclusive access to the metadata buffer
3297 * allows us to do racy operations such as looking for remaining space left in
3298 * packet and write, since mutual exclusion protects us from concurrent writes.
3299 * Mutual exclusion on the metadata cache allow us to read the cache content
3300 * without racing against reallocation of the cache by updates.
3301 * Returns the number of bytes written in the channel, 0 if no data
3302 * was written and a negative value on error.
3304 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
3305 struct channel
*chan
, bool *coherent
)
3307 struct lib_ring_buffer_ctx ctx
;
3309 size_t len
, reserve_len
;
3312 * Ensure we support mutiple get_next / put sequences followed by
3313 * put_next. The metadata cache lock protects reading the metadata
3314 * cache. It can indeed be read concurrently by "get_next_subbuf" and
3315 * "flush" operations on the buffer invoked by different processes.
3316 * Moreover, since the metadata cache memory can be reallocated, we
3317 * need to have exclusive access against updates even though we only
3320 mutex_lock(&stream
->metadata_cache
->lock
);
3321 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
3322 if (stream
->metadata_in
!= stream
->metadata_out
)
3325 /* Metadata regenerated, change the version. */
3326 if (stream
->metadata_cache
->version
!= stream
->version
)
3327 stream
->version
= stream
->metadata_cache
->version
;
3329 len
= stream
->metadata_cache
->metadata_written
-
3330 stream
->metadata_in
;
3333 reserve_len
= min_t(size_t,
3334 stream
->transport
->ops
.packet_avail_size(chan
),
3336 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
3339 * If reservation failed, return an error to the caller.
3341 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
3343 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
3344 stream
->coherent
= false;
3347 stream
->transport
->ops
.event_write(&ctx
,
3348 stream
->metadata_cache
->data
+ stream
->metadata_in
,
3350 stream
->transport
->ops
.event_commit(&ctx
);
3351 stream
->metadata_in
+= reserve_len
;
3352 if (reserve_len
< len
)
3353 stream
->coherent
= false;
3355 stream
->coherent
= true;
3360 *coherent
= stream
->coherent
;
3361 mutex_unlock(&stream
->metadata_cache
->lock
);
3366 void lttng_metadata_begin(struct lttng_session
*session
)
3368 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
3369 mutex_lock(&session
->metadata_cache
->lock
);
3373 void lttng_metadata_end(struct lttng_session
*session
)
3375 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
3376 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
3377 struct lttng_metadata_stream
*stream
;
3379 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
3380 wake_up_interruptible(&stream
->read_wait
);
3381 mutex_unlock(&session
->metadata_cache
->lock
);
3386 * Write the metadata to the metadata cache.
3387 * Must be called with sessions_mutex held.
3388 * The metadata cache lock protects us from concurrent read access from
3389 * thread outputting metadata content to ring buffer.
3390 * The content of the printf is printed as a single atomic metadata
3393 int lttng_metadata_printf(struct lttng_session
*session
,
3394 const char *fmt
, ...)
3400 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3403 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3409 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
3410 if (session
->metadata_cache
->metadata_written
+ len
>
3411 session
->metadata_cache
->cache_alloc
) {
3412 char *tmp_cache_realloc
;
3413 unsigned int tmp_cache_alloc_size
;
3415 tmp_cache_alloc_size
= max_t(unsigned int,
3416 session
->metadata_cache
->cache_alloc
+ len
,
3417 session
->metadata_cache
->cache_alloc
<< 1);
3418 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3419 if (!tmp_cache_realloc
)
3421 if (session
->metadata_cache
->data
) {
3422 memcpy(tmp_cache_realloc
,
3423 session
->metadata_cache
->data
,
3424 session
->metadata_cache
->cache_alloc
);
3425 vfree(session
->metadata_cache
->data
);
3428 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3429 session
->metadata_cache
->data
= tmp_cache_realloc
;
3431 memcpy(session
->metadata_cache
->data
+
3432 session
->metadata_cache
->metadata_written
,
3434 session
->metadata_cache
->metadata_written
+= len
;
3445 int print_tabs(struct lttng_session
*session
, size_t nesting
)
3449 for (i
= 0; i
< nesting
; i
++) {
3452 ret
= lttng_metadata_printf(session
, " ");
3461 int lttng_field_name_statedump(struct lttng_session
*session
,
3462 const struct lttng_event_field
*field
,
3465 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3469 int _lttng_integer_type_statedump(struct lttng_session
*session
,
3470 const struct lttng_type
*type
,
3475 WARN_ON_ONCE(type
->atype
!= atype_integer
);
3476 ret
= print_tabs(session
, nesting
);
3479 ret
= lttng_metadata_printf(session
,
3480 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3481 type
->u
.integer
.size
,
3482 type
->u
.integer
.alignment
,
3483 type
->u
.integer
.signedness
,
3484 (type
->u
.integer
.encoding
== lttng_encode_none
)
3486 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
3489 type
->u
.integer
.base
,
3490 #if __BYTE_ORDER == __BIG_ENDIAN
3491 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
3493 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
3500 * Must be called with sessions_mutex held.
3503 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3504 const struct lttng_type
*type
,
3508 uint32_t i
, nr_fields
;
3509 unsigned int alignment
;
3511 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
3513 ret
= print_tabs(session
, nesting
);
3516 ret
= lttng_metadata_printf(session
,
3520 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
3521 for (i
= 0; i
< nr_fields
; i
++) {
3522 const struct lttng_event_field
*iter_field
;
3524 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
3525 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3529 ret
= print_tabs(session
, nesting
);
3532 alignment
= type
->u
.struct_nestable
.alignment
;
3534 ret
= lttng_metadata_printf(session
,
3538 ret
= lttng_metadata_printf(session
,
3545 * Must be called with sessions_mutex held.
3548 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3549 const struct lttng_event_field
*field
,
3554 ret
= _lttng_struct_type_statedump(session
,
3555 &field
->type
, nesting
);
3558 return lttng_field_name_statedump(session
, field
, nesting
);
3562 * Must be called with sessions_mutex held.
3565 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3566 const struct lttng_type
*type
,
3570 uint32_t i
, nr_choices
;
3572 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
3574 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3576 if (type
->u
.variant_nestable
.alignment
!= 0)
3578 ret
= print_tabs(session
, nesting
);
3581 ret
= lttng_metadata_printf(session
,
3582 "variant <_%s> {\n",
3583 type
->u
.variant_nestable
.tag_name
);
3586 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
3587 for (i
= 0; i
< nr_choices
; i
++) {
3588 const struct lttng_event_field
*iter_field
;
3590 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
3591 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3595 ret
= print_tabs(session
, nesting
);
3598 ret
= lttng_metadata_printf(session
,
3604 * Must be called with sessions_mutex held.
3607 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3608 const struct lttng_event_field
*field
,
3613 ret
= _lttng_variant_type_statedump(session
,
3614 &field
->type
, nesting
);
3617 return lttng_field_name_statedump(session
, field
, nesting
);
3621 * Must be called with sessions_mutex held.
3624 int _lttng_array_field_statedump(struct lttng_session
*session
,
3625 const struct lttng_event_field
*field
,
3629 const struct lttng_type
*elem_type
;
3631 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
3633 if (field
->type
.u
.array_nestable
.alignment
) {
3634 ret
= print_tabs(session
, nesting
);
3637 ret
= lttng_metadata_printf(session
,
3638 "struct { } align(%u) _%s_padding;\n",
3639 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
3645 * Nested compound types: Only array of structures and variants are
3646 * currently supported.
3648 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
3649 switch (elem_type
->atype
) {
3651 case atype_struct_nestable
:
3652 case atype_variant_nestable
:
3653 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3661 ret
= lttng_metadata_printf(session
,
3664 field
->type
.u
.array_nestable
.length
);
3669 * Must be called with sessions_mutex held.
3672 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3673 const struct lttng_event_field
*field
,
3677 const char *length_name
;
3678 const struct lttng_type
*elem_type
;
3680 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
3682 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
3684 if (field
->type
.u
.sequence_nestable
.alignment
) {
3685 ret
= print_tabs(session
, nesting
);
3688 ret
= lttng_metadata_printf(session
,
3689 "struct { } align(%u) _%s_padding;\n",
3690 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
3697 * Nested compound types: Only array of structures and variants are
3698 * currently supported.
3700 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
3701 switch (elem_type
->atype
) {
3703 case atype_struct_nestable
:
3704 case atype_variant_nestable
:
3705 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3713 ret
= lttng_metadata_printf(session
,
3716 field
->type
.u
.sequence_nestable
.length_name
);
3721 * Must be called with sessions_mutex held.
3724 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3725 const struct lttng_type
*type
,
3728 const struct lttng_enum_desc
*enum_desc
;
3729 const struct lttng_type
*container_type
;
3731 unsigned int i
, nr_entries
;
3733 container_type
= type
->u
.enum_nestable
.container_type
;
3734 if (container_type
->atype
!= atype_integer
) {
3738 enum_desc
= type
->u
.enum_nestable
.desc
;
3739 nr_entries
= enum_desc
->nr_entries
;
3741 ret
= print_tabs(session
, nesting
);
3744 ret
= lttng_metadata_printf(session
, "enum : ");
3747 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
3750 ret
= lttng_metadata_printf(session
, " {\n");
3753 /* Dump all entries */
3754 for (i
= 0; i
< nr_entries
; i
++) {
3755 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
3758 ret
= print_tabs(session
, nesting
+ 1);
3761 ret
= lttng_metadata_printf(session
,
3765 len
= strlen(entry
->string
);
3766 /* Escape the character '"' */
3767 for (j
= 0; j
< len
; j
++) {
3768 char c
= entry
->string
[j
];
3772 ret
= lttng_metadata_printf(session
,
3776 ret
= lttng_metadata_printf(session
,
3780 ret
= lttng_metadata_printf(session
,
3787 ret
= lttng_metadata_printf(session
, "\"");
3791 if (entry
->options
.is_auto
) {
3792 ret
= lttng_metadata_printf(session
, ",\n");
3796 ret
= lttng_metadata_printf(session
,
3800 if (entry
->start
.signedness
)
3801 ret
= lttng_metadata_printf(session
,
3802 "%lld", (long long) entry
->start
.value
);
3804 ret
= lttng_metadata_printf(session
,
3805 "%llu", entry
->start
.value
);
3808 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3810 == entry
->end
.value
) {
3811 ret
= lttng_metadata_printf(session
,
3814 if (entry
->end
.signedness
) {
3815 ret
= lttng_metadata_printf(session
,
3817 (long long) entry
->end
.value
);
3819 ret
= lttng_metadata_printf(session
,
3828 ret
= print_tabs(session
, nesting
);
3831 ret
= lttng_metadata_printf(session
, "}");
3837 * Must be called with sessions_mutex held.
3840 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3841 const struct lttng_event_field
*field
,
3846 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3849 return lttng_field_name_statedump(session
, field
, nesting
);
3853 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3854 const struct lttng_event_field
*field
,
3859 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3862 return lttng_field_name_statedump(session
, field
, nesting
);
3866 int _lttng_string_type_statedump(struct lttng_session
*session
,
3867 const struct lttng_type
*type
,
3872 WARN_ON_ONCE(type
->atype
!= atype_string
);
3873 /* Default encoding is UTF8 */
3874 ret
= print_tabs(session
, nesting
);
3877 ret
= lttng_metadata_printf(session
,
3879 type
->u
.string
.encoding
== lttng_encode_ASCII
?
3880 " { encoding = ASCII; }" : "");
3885 int _lttng_string_field_statedump(struct lttng_session
*session
,
3886 const struct lttng_event_field
*field
,
3891 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
3892 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3895 return lttng_field_name_statedump(session
, field
, nesting
);
3899 * Must be called with sessions_mutex held.
3902 int _lttng_type_statedump(struct lttng_session
*session
,
3903 const struct lttng_type
*type
,
3908 switch (type
->atype
) {
3910 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3912 case atype_enum_nestable
:
3913 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3916 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3918 case atype_struct_nestable
:
3919 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3921 case atype_variant_nestable
:
3922 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3925 /* Nested arrays and sequences are not supported yet. */
3926 case atype_array_nestable
:
3927 case atype_sequence_nestable
:
3936 * Must be called with sessions_mutex held.
3939 int _lttng_field_statedump(struct lttng_session
*session
,
3940 const struct lttng_event_field
*field
,
3945 switch (field
->type
.atype
) {
3947 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3949 case atype_enum_nestable
:
3950 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3953 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3955 case atype_struct_nestable
:
3956 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3958 case atype_array_nestable
:
3959 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3961 case atype_sequence_nestable
:
3962 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3964 case atype_variant_nestable
:
3965 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3976 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3977 struct lttng_ctx
*ctx
)
3984 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3985 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3987 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3995 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3996 struct lttng_event
*event
)
3998 const struct lttng_event_desc
*desc
= event
->desc
;
4002 for (i
= 0; i
< desc
->nr_fields
; i
++) {
4003 const struct lttng_event_field
*field
= &desc
->fields
[i
];
4005 ret
= _lttng_field_statedump(session
, field
, 2);
4013 * Must be called with sessions_mutex held.
4014 * The entire event metadata is printed as a single atomic metadata
4018 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
4019 struct lttng_event
*event
)
4021 struct lttng_channel
*chan
;
4024 WARN_ON_ONCE(event
->container
->type
!= LTTNG_EVENT_CONTAINER_CHANNEL
);
4025 chan
= lttng_event_container_get_channel(event
->container
);
4026 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
4028 if (chan
->channel_type
== METADATA_CHANNEL
)
4031 lttng_metadata_begin(session
);
4033 ret
= lttng_metadata_printf(session
,
4037 " stream_id = %u;\n",
4045 ret
= lttng_metadata_printf(session
,
4046 " context := struct {\n");
4050 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
4054 ret
= lttng_metadata_printf(session
,
4060 ret
= lttng_metadata_printf(session
,
4061 " fields := struct {\n"
4066 ret
= _lttng_fields_metadata_statedump(session
, event
);
4071 * LTTng space reservation can only reserve multiples of the
4074 ret
= lttng_metadata_printf(session
,
4080 event
->metadata_dumped
= 1;
4082 lttng_metadata_end(session
);
4088 * Must be called with sessions_mutex held.
4089 * The entire channel metadata is printed as a single atomic metadata
4093 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
4094 struct lttng_channel
*chan
)
4098 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
4101 if (chan
->channel_type
== METADATA_CHANNEL
)
4104 lttng_metadata_begin(session
);
4106 WARN_ON_ONCE(!chan
->header_type
);
4107 ret
= lttng_metadata_printf(session
,
4110 " event.header := %s;\n"
4111 " packet.context := struct packet_context;\n",
4113 chan
->header_type
== 1 ? "struct event_header_compact" :
4114 "struct event_header_large");
4119 ret
= lttng_metadata_printf(session
,
4120 " event.context := struct {\n");
4124 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
4128 ret
= lttng_metadata_printf(session
,
4134 ret
= lttng_metadata_printf(session
,
4137 chan
->metadata_dumped
= 1;
4139 lttng_metadata_end(session
);
4144 * Must be called with sessions_mutex held.
4147 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
4149 return lttng_metadata_printf(session
,
4150 "struct packet_context {\n"
4151 " uint64_clock_monotonic_t timestamp_begin;\n"
4152 " uint64_clock_monotonic_t timestamp_end;\n"
4153 " uint64_t content_size;\n"
4154 " uint64_t packet_size;\n"
4155 " uint64_t packet_seq_num;\n"
4156 " unsigned long events_discarded;\n"
4157 " uint32_t cpu_id;\n"
4164 * id: range: 0 - 30.
4165 * id 31 is reserved to indicate an extended header.
4168 * id: range: 0 - 65534.
4169 * id 65535 is reserved to indicate an extended header.
4171 * Must be called with sessions_mutex held.
4174 int _lttng_event_header_declare(struct lttng_session
*session
)
4176 return lttng_metadata_printf(session
,
4177 "struct event_header_compact {\n"
4178 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
4181 " uint27_clock_monotonic_t timestamp;\n"
4185 " uint64_clock_monotonic_t timestamp;\n"
4190 "struct event_header_large {\n"
4191 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
4194 " uint32_clock_monotonic_t timestamp;\n"
4198 " uint64_clock_monotonic_t timestamp;\n"
4202 lttng_alignof(uint32_t) * CHAR_BIT
,
4203 lttng_alignof(uint16_t) * CHAR_BIT
4208 * Approximation of NTP time of day to clock monotonic correlation,
4209 * taken at start of trace.
4210 * Yes, this is only an approximation. Yes, we can (and will) do better
4211 * in future versions.
4212 * This function may return a negative offset. It may happen if the
4213 * system sets the REALTIME clock to 0 after boot.
4215 * Use 64bit timespec on kernels that have it, this makes 32bit arch
4219 int64_t measure_clock_offset(void)
4221 uint64_t monotonic_avg
, monotonic
[2], realtime
;
4222 uint64_t tcf
= trace_clock_freq();
4224 unsigned long flags
;
4225 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
4226 struct timespec64 rts
= { 0, 0 };
4228 struct timespec rts
= { 0, 0 };
4231 /* Disable interrupts to increase correlation precision. */
4232 local_irq_save(flags
);
4233 monotonic
[0] = trace_clock_read64();
4234 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
4235 ktime_get_real_ts64(&rts
);
4237 getnstimeofday(&rts
);
4239 monotonic
[1] = trace_clock_read64();
4240 local_irq_restore(flags
);
4242 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
4243 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
4244 if (tcf
== NSEC_PER_SEC
) {
4245 realtime
+= rts
.tv_nsec
;
4247 uint64_t n
= rts
.tv_nsec
* tcf
;
4249 do_div(n
, NSEC_PER_SEC
);
4252 offset
= (int64_t) realtime
- monotonic_avg
;
4257 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
4265 while (cur
!= '\0') {
4268 ret
= lttng_metadata_printf(session
, "%s", "\\n");
4272 ret
= lttng_metadata_printf(session
, "%c", '\\');
4275 /* We still print the current char */
4278 ret
= lttng_metadata_printf(session
, "%c", cur
);
4292 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
4293 const char *field_value
)
4297 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
4301 ret
= print_escaped_ctf_string(session
, field_value
);
4305 ret
= lttng_metadata_printf(session
, "\";\n");
4312 * Output metadata into this session's metadata buffers.
4313 * Must be called with sessions_mutex held.
4316 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
4318 unsigned char *uuid_c
= session
->uuid
.b
;
4319 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
4320 const char *product_uuid
;
4321 struct lttng_channel
*chan
;
4322 struct lttng_event
*event
;
4325 if (!LTTNG_READ_ONCE(session
->active
))
4328 lttng_metadata_begin(session
);
4330 if (session
->metadata_dumped
)
4333 snprintf(uuid_s
, sizeof(uuid_s
),
4334 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
4335 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
4336 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
4337 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
4338 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
4340 ret
= lttng_metadata_printf(session
,
4341 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4342 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4343 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4344 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4345 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4346 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4347 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4353 " byte_order = %s;\n"
4354 " packet.header := struct {\n"
4355 " uint32_t magic;\n"
4356 " uint8_t uuid[16];\n"
4357 " uint32_t stream_id;\n"
4358 " uint64_t stream_instance_id;\n"
4361 lttng_alignof(uint8_t) * CHAR_BIT
,
4362 lttng_alignof(uint16_t) * CHAR_BIT
,
4363 lttng_alignof(uint32_t) * CHAR_BIT
,
4364 lttng_alignof(uint64_t) * CHAR_BIT
,
4365 sizeof(unsigned long) * CHAR_BIT
,
4366 lttng_alignof(unsigned long) * CHAR_BIT
,
4370 #if __BYTE_ORDER == __BIG_ENDIAN
4379 ret
= lttng_metadata_printf(session
,
4381 " hostname = \"%s\";\n"
4382 " domain = \"kernel\";\n"
4383 " sysname = \"%s\";\n"
4384 " kernel_release = \"%s\";\n"
4385 " kernel_version = \"%s\";\n"
4386 " tracer_name = \"lttng-modules\";\n"
4387 " tracer_major = %d;\n"
4388 " tracer_minor = %d;\n"
4389 " tracer_patchlevel = %d;\n"
4390 " trace_buffering_scheme = \"global\";\n",
4391 current
->nsproxy
->uts_ns
->name
.nodename
,
4395 LTTNG_MODULES_MAJOR_VERSION
,
4396 LTTNG_MODULES_MINOR_VERSION
,
4397 LTTNG_MODULES_PATCHLEVEL_VERSION
4402 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
4405 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4406 session
->creation_time
);
4410 /* Add the product UUID to the 'env' section */
4411 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4413 ret
= lttng_metadata_printf(session
,
4414 " product_uuid = \"%s\";\n",
4421 /* Close the 'env' section */
4422 ret
= lttng_metadata_printf(session
, "};\n\n");
4426 ret
= lttng_metadata_printf(session
,
4428 " name = \"%s\";\n",
4434 if (!trace_clock_uuid(clock_uuid_s
)) {
4435 ret
= lttng_metadata_printf(session
,
4436 " uuid = \"%s\";\n",
4443 ret
= lttng_metadata_printf(session
,
4444 " description = \"%s\";\n"
4445 " freq = %llu; /* Frequency, in Hz */\n"
4446 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4449 trace_clock_description(),
4450 (unsigned long long) trace_clock_freq(),
4451 (long long) measure_clock_offset()
4456 ret
= lttng_metadata_printf(session
,
4457 "typealias integer {\n"
4458 " size = 27; align = 1; signed = false;\n"
4459 " map = clock.%s.value;\n"
4460 "} := uint27_clock_monotonic_t;\n"
4462 "typealias integer {\n"
4463 " size = 32; align = %u; signed = false;\n"
4464 " map = clock.%s.value;\n"
4465 "} := uint32_clock_monotonic_t;\n"
4467 "typealias integer {\n"
4468 " size = 64; align = %u; signed = false;\n"
4469 " map = clock.%s.value;\n"
4470 "} := uint64_clock_monotonic_t;\n\n",
4472 lttng_alignof(uint32_t) * CHAR_BIT
,
4474 lttng_alignof(uint64_t) * CHAR_BIT
,
4480 ret
= _lttng_stream_packet_context_declare(session
);
4484 ret
= _lttng_event_header_declare(session
);
4489 list_for_each_entry(chan
, &session
->chan
, list
) {
4490 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4495 list_for_each_entry(event
, &session
->events
, list
) {
4496 /* Skip counter container. */
4497 if (event
->container
->type
!= LTTNG_EVENT_CONTAINER_CHANNEL
)
4499 ret
= _lttng_event_metadata_statedump(session
, event
);
4503 session
->metadata_dumped
= 1;
4505 lttng_metadata_end(session
);
4510 * lttng_transport_register - LTT transport registration
4511 * @transport: transport structure
4513 * Registers a transport which can be used as output to extract the data out of
4514 * LTTng. The module calling this registration function must ensure that no
4515 * trap-inducing code will be executed by the transport functions. E.g.
4516 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4517 * is made visible to the transport function. This registration acts as a
4518 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4519 * after its registration must it synchronize the TLBs.
4521 void lttng_transport_register(struct lttng_transport
*transport
)
4524 * Make sure no page fault can be triggered by the module about to be
4525 * registered. We deal with this here so we don't have to call
4526 * vmalloc_sync_mappings() in each module's init.
4528 wrapper_vmalloc_sync_mappings();
4530 mutex_lock(&sessions_mutex
);
4531 list_add_tail(&transport
->node
, <tng_transport_list
);
4532 mutex_unlock(&sessions_mutex
);
4534 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4537 * lttng_transport_unregister - LTT transport unregistration
4538 * @transport: transport structure
4540 void lttng_transport_unregister(struct lttng_transport
*transport
)
4542 mutex_lock(&sessions_mutex
);
4543 list_del(&transport
->node
);
4544 mutex_unlock(&sessions_mutex
);
4546 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4548 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4551 * Make sure no page fault can be triggered by the module about to be
4552 * registered. We deal with this here so we don't have to call
4553 * vmalloc_sync_mappings() in each module's init.
4555 wrapper_vmalloc_sync_mappings();
4557 mutex_lock(&sessions_mutex
);
4558 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4559 mutex_unlock(&sessions_mutex
);
4561 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4563 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4565 mutex_lock(&sessions_mutex
);
4566 list_del(&transport
->node
);
4567 mutex_unlock(&sessions_mutex
);
4569 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4571 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4573 enum cpuhp_state lttng_hp_prepare
;
4574 enum cpuhp_state lttng_hp_online
;
4576 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4578 struct lttng_cpuhp_node
*lttng_node
;
4580 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4581 switch (lttng_node
->component
) {
4582 case LTTNG_RING_BUFFER_FRONTEND
:
4584 case LTTNG_RING_BUFFER_BACKEND
:
4585 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4586 case LTTNG_RING_BUFFER_ITER
:
4588 case LTTNG_CONTEXT_PERF_COUNTERS
:
4595 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4597 struct lttng_cpuhp_node
*lttng_node
;
4599 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4600 switch (lttng_node
->component
) {
4601 case LTTNG_RING_BUFFER_FRONTEND
:
4602 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4603 case LTTNG_RING_BUFFER_BACKEND
:
4605 case LTTNG_RING_BUFFER_ITER
:
4607 case LTTNG_CONTEXT_PERF_COUNTERS
:
4608 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4614 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4616 struct lttng_cpuhp_node
*lttng_node
;
4618 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4619 switch (lttng_node
->component
) {
4620 case LTTNG_RING_BUFFER_FRONTEND
:
4621 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4622 case LTTNG_RING_BUFFER_BACKEND
:
4624 case LTTNG_RING_BUFFER_ITER
:
4625 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4626 case LTTNG_CONTEXT_PERF_COUNTERS
:
4627 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4633 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4635 struct lttng_cpuhp_node
*lttng_node
;
4637 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4638 switch (lttng_node
->component
) {
4639 case LTTNG_RING_BUFFER_FRONTEND
:
4640 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4641 case LTTNG_RING_BUFFER_BACKEND
:
4643 case LTTNG_RING_BUFFER_ITER
:
4645 case LTTNG_CONTEXT_PERF_COUNTERS
:
4652 static int __init
lttng_init_cpu_hotplug(void)
4656 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4657 lttng_hotplug_prepare
,
4658 lttng_hotplug_dead
);
4662 lttng_hp_prepare
= ret
;
4663 lttng_rb_set_hp_prepare(ret
);
4665 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4666 lttng_hotplug_online
,
4667 lttng_hotplug_offline
);
4669 cpuhp_remove_multi_state(lttng_hp_prepare
);
4670 lttng_hp_prepare
= 0;
4673 lttng_hp_online
= ret
;
4674 lttng_rb_set_hp_online(ret
);
4679 static void __exit
lttng_exit_cpu_hotplug(void)
4681 lttng_rb_set_hp_online(0);
4682 cpuhp_remove_multi_state(lttng_hp_online
);
4683 lttng_rb_set_hp_prepare(0);
4684 cpuhp_remove_multi_state(lttng_hp_prepare
);
4687 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4688 static int lttng_init_cpu_hotplug(void)
4692 static void lttng_exit_cpu_hotplug(void)
4695 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4698 static int __init
lttng_events_init(void)
4702 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4705 ret
= wrapper_get_pfnblock_flags_mask_init();
4708 ret
= wrapper_get_pageblock_flags_mask_init();
4711 ret
= lttng_probes_init();
4714 ret
= lttng_context_init();
4717 ret
= lttng_tracepoint_init();
4720 event_cache
= KMEM_CACHE(lttng_event
, 0);
4723 goto error_kmem_event
;
4725 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4726 if (!event_notifier_cache
) {
4728 goto error_kmem_event_notifier
;
4730 ret
= lttng_abi_init();
4733 ret
= lttng_logger_init();
4736 ret
= lttng_init_cpu_hotplug();
4739 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4740 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4741 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4742 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4743 LTTNG_MODULES_EXTRAVERSION
,
4745 #ifdef LTTNG_EXTRA_VERSION_GIT
4746 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4750 #ifdef LTTNG_EXTRA_VERSION_NAME
4751 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4758 lttng_logger_exit();
4762 kmem_cache_destroy(event_notifier_cache
);
4763 error_kmem_event_notifier
:
4764 kmem_cache_destroy(event_cache
);
4766 lttng_tracepoint_exit();
4768 lttng_context_exit();
4769 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4770 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4771 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4772 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4773 LTTNG_MODULES_EXTRAVERSION
,
4775 #ifdef LTTNG_EXTRA_VERSION_GIT
4776 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4780 #ifdef LTTNG_EXTRA_VERSION_NAME
4781 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4788 module_init(lttng_events_init
);
4790 static void __exit
lttng_events_exit(void)
4792 struct lttng_session
*session
, *tmpsession
;
4794 lttng_exit_cpu_hotplug();
4795 lttng_logger_exit();
4797 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4798 lttng_session_destroy(session
);
4799 kmem_cache_destroy(event_cache
);
4800 kmem_cache_destroy(event_notifier_cache
);
4801 lttng_tracepoint_exit();
4802 lttng_context_exit();
4803 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4804 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4805 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4806 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4807 LTTNG_MODULES_EXTRAVERSION
,
4809 #ifdef LTTNG_EXTRA_VERSION_GIT
4810 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4814 #ifdef LTTNG_EXTRA_VERSION_NAME
4815 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4821 module_exit(lttng_events_exit
);
4823 #include <generated/patches.h>
4824 #ifdef LTTNG_EXTRA_VERSION_GIT
4825 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4827 #ifdef LTTNG_EXTRA_VERSION_NAME
4828 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4830 MODULE_LICENSE("GPL and additional rights");
4831 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4832 MODULE_DESCRIPTION("LTTng tracer");
4833 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4834 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4835 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4836 LTTNG_MODULES_EXTRAVERSION
);