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/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.h>
40 #include <lttng/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.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_recorder_cache
;
63 static struct kmem_cache
*event_recorder_private_cache
;
64 static struct kmem_cache
*event_notifier_cache
;
65 static struct kmem_cache
*event_notifier_private_cache
;
67 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
68 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
69 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
70 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
71 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
73 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
74 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
75 static int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event
);
76 static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
78 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
79 struct lttng_kernel_channel_buffer
*chan
,
80 struct lttng_kernel_event_recorder
*event
);
82 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
84 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
86 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
87 const struct lttng_kernel_type_common
*type
,
88 enum lttng_kernel_string_encoding parent_encoding
,
91 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
92 const struct lttng_kernel_event_field
*field
,
93 size_t nesting
, const char **prev_field_name_p
);
95 void synchronize_trace(void)
97 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
98 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
104 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
105 #ifdef CONFIG_PREEMPT_RT_FULL
108 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
109 #ifdef CONFIG_PREEMPT_RT
112 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
115 void lttng_lock_sessions(void)
117 mutex_lock(&sessions_mutex
);
120 void lttng_unlock_sessions(void)
122 mutex_unlock(&sessions_mutex
);
125 static struct lttng_transport
*lttng_transport_find(const char *name
)
127 struct lttng_transport
*transport
;
129 list_for_each_entry(transport
, <tng_transport_list
, node
) {
130 if (!strcmp(transport
->name
, name
))
137 * Called with sessions lock held.
139 int lttng_session_active(void)
141 struct lttng_kernel_session_private
*iter
;
143 list_for_each_entry(iter
, &sessions
, list
) {
144 if (iter
->pub
->active
)
150 struct lttng_kernel_session
*lttng_session_create(void)
152 struct lttng_kernel_session
*session
;
153 struct lttng_kernel_session_private
*session_priv
;
154 struct lttng_metadata_cache
*metadata_cache
;
157 mutex_lock(&sessions_mutex
);
158 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
161 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
163 goto err_free_session
;
164 session
->priv
= session_priv
;
165 session_priv
->pub
= session
;
167 INIT_LIST_HEAD(&session_priv
->chan
);
168 INIT_LIST_HEAD(&session_priv
->events
);
169 lttng_guid_gen(&session_priv
->uuid
);
171 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
174 goto err_free_session_private
;
175 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
176 if (!metadata_cache
->data
)
178 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
179 kref_init(&metadata_cache
->refcount
);
180 mutex_init(&metadata_cache
->lock
);
181 session_priv
->metadata_cache
= metadata_cache
;
182 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
183 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
184 sizeof(metadata_cache
->uuid
));
185 INIT_LIST_HEAD(&session_priv
->enablers_head
);
186 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
187 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
188 list_add(&session_priv
->list
, &sessions
);
190 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
195 goto tracker_alloc_error
;
196 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
197 goto tracker_alloc_error
;
198 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
199 goto tracker_alloc_error
;
200 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
201 goto tracker_alloc_error
;
203 mutex_unlock(&sessions_mutex
);
208 lttng_id_tracker_fini(&session
->pid_tracker
);
209 lttng_id_tracker_fini(&session
->vpid_tracker
);
210 lttng_id_tracker_fini(&session
->uid_tracker
);
211 lttng_id_tracker_fini(&session
->vuid_tracker
);
212 lttng_id_tracker_fini(&session
->gid_tracker
);
213 lttng_id_tracker_fini(&session
->vgid_tracker
);
215 kfree(metadata_cache
);
216 err_free_session_private
:
217 lttng_kvfree(session_priv
);
219 lttng_kvfree(session
);
221 mutex_unlock(&sessions_mutex
);
226 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
228 struct lttng_counter_transport
*transport
;
230 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
231 if (!strcmp(transport
->name
, name
))
237 struct lttng_counter
*lttng_kernel_counter_create(
238 const char *counter_transport_name
,
239 size_t number_dimensions
, const size_t *dimensions_sizes
)
241 struct lttng_counter
*counter
= NULL
;
242 struct lttng_counter_transport
*counter_transport
= NULL
;
244 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
245 if (!counter_transport
) {
246 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
247 counter_transport_name
);
250 if (!try_module_get(counter_transport
->owner
)) {
251 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
255 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
259 /* Create event notifier error counter. */
260 counter
->ops
= &counter_transport
->ops
;
261 counter
->transport
= counter_transport
;
263 counter
->counter
= counter
->ops
->counter_create(
264 number_dimensions
, dimensions_sizes
, 0);
265 if (!counter
->counter
) {
272 lttng_kvfree(counter
);
274 if (counter_transport
)
275 module_put(counter_transport
->owner
);
280 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
282 struct lttng_transport
*transport
= NULL
;
283 struct lttng_event_notifier_group
*event_notifier_group
;
284 const char *transport_name
= "relay-event-notifier";
285 size_t subbuf_size
= 4096; //TODO
286 size_t num_subbuf
= 16; //TODO
287 unsigned int switch_timer_interval
= 0;
288 unsigned int read_timer_interval
= 0;
291 mutex_lock(&sessions_mutex
);
293 transport
= lttng_transport_find(transport_name
);
295 printk(KERN_WARNING
"LTTng: transport %s not found\n",
299 if (!try_module_get(transport
->owner
)) {
300 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
305 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
307 if (!event_notifier_group
)
311 * Initialize the ring buffer used to store event notifier
314 event_notifier_group
->ops
= &transport
->ops
;
315 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
316 transport_name
, event_notifier_group
, NULL
,
317 subbuf_size
, num_subbuf
, switch_timer_interval
,
318 read_timer_interval
);
319 if (!event_notifier_group
->chan
)
322 event_notifier_group
->transport
= transport
;
324 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
325 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
326 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
327 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
329 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
331 mutex_unlock(&sessions_mutex
);
333 return event_notifier_group
;
336 lttng_kvfree(event_notifier_group
);
339 module_put(transport
->owner
);
341 mutex_unlock(&sessions_mutex
);
345 void metadata_cache_destroy(struct kref
*kref
)
347 struct lttng_metadata_cache
*cache
=
348 container_of(kref
, struct lttng_metadata_cache
, refcount
);
353 void lttng_session_destroy(struct lttng_kernel_session
*session
)
355 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
356 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
357 struct lttng_metadata_stream
*metadata_stream
;
358 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
361 mutex_lock(&sessions_mutex
);
362 WRITE_ONCE(session
->active
, 0);
363 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
364 ret
= lttng_syscalls_unregister_channel(chan_priv
->pub
);
367 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
368 ret
= _lttng_event_unregister(event_recorder_priv
->pub
);
371 synchronize_trace(); /* Wait for in-flight events to complete */
372 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
373 ret
= lttng_syscalls_destroy_event(chan_priv
->pub
);
376 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
377 &session
->priv
->enablers_head
, node
)
378 lttng_event_enabler_destroy(event_enabler
);
379 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, node
)
380 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
381 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
382 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
383 _lttng_channel_destroy(chan_priv
->pub
);
385 mutex_lock(&session
->priv
->metadata_cache
->lock
);
386 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
387 _lttng_metadata_channel_hangup(metadata_stream
);
388 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
389 lttng_id_tracker_fini(&session
->pid_tracker
);
390 lttng_id_tracker_fini(&session
->vpid_tracker
);
391 lttng_id_tracker_fini(&session
->uid_tracker
);
392 lttng_id_tracker_fini(&session
->vuid_tracker
);
393 lttng_id_tracker_fini(&session
->gid_tracker
);
394 lttng_id_tracker_fini(&session
->vgid_tracker
);
395 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
396 list_del(&session
->priv
->list
);
397 mutex_unlock(&sessions_mutex
);
398 lttng_kvfree(session
->priv
);
399 lttng_kvfree(session
);
402 void lttng_event_notifier_group_destroy(
403 struct lttng_event_notifier_group
*event_notifier_group
)
405 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
406 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
409 if (!event_notifier_group
)
412 mutex_lock(&sessions_mutex
);
414 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
417 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
418 &event_notifier_group
->event_notifiers_head
, node
) {
419 ret
= _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
423 /* Wait for in-flight event notifier to complete */
426 irq_work_sync(&event_notifier_group
->wakeup_pending
);
428 kfree(event_notifier_group
->sc_filter
);
430 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
431 &event_notifier_group
->enablers_head
, node
)
432 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
434 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
435 &event_notifier_group
->event_notifiers_head
, node
)
436 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
438 if (event_notifier_group
->error_counter
) {
439 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
441 error_counter
->ops
->counter_destroy(error_counter
->counter
);
442 module_put(error_counter
->transport
->owner
);
443 lttng_kvfree(error_counter
);
444 event_notifier_group
->error_counter
= NULL
;
447 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
448 module_put(event_notifier_group
->transport
->owner
);
449 list_del(&event_notifier_group
->node
);
451 mutex_unlock(&sessions_mutex
);
452 lttng_kvfree(event_notifier_group
);
455 int lttng_session_statedump(struct lttng_kernel_session
*session
)
459 mutex_lock(&sessions_mutex
);
460 ret
= lttng_statedump_start(session
);
461 mutex_unlock(&sessions_mutex
);
465 int lttng_session_enable(struct lttng_kernel_session
*session
)
468 struct lttng_kernel_channel_buffer_private
*chan_priv
;
470 mutex_lock(&sessions_mutex
);
471 if (session
->active
) {
476 /* Set transient enabler state to "enabled" */
477 session
->priv
->tstate
= 1;
479 /* We need to sync enablers with session before activation. */
480 lttng_session_sync_event_enablers(session
);
483 * Snapshot the number of events per channel to know the type of header
486 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
487 if (chan_priv
->header_type
)
488 continue; /* don't change it if session stop/restart */
489 if (chan_priv
->free_event_id
< 31)
490 chan_priv
->header_type
= 1; /* compact */
492 chan_priv
->header_type
= 2; /* large */
495 /* Clear each stream's quiescent state. */
496 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
497 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
498 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
501 WRITE_ONCE(session
->active
, 1);
502 WRITE_ONCE(session
->priv
->been_active
, 1);
503 ret
= _lttng_session_metadata_statedump(session
);
505 WRITE_ONCE(session
->active
, 0);
508 ret
= lttng_statedump_start(session
);
510 WRITE_ONCE(session
->active
, 0);
512 mutex_unlock(&sessions_mutex
);
516 int lttng_session_disable(struct lttng_kernel_session
*session
)
519 struct lttng_kernel_channel_buffer_private
*chan_priv
;
521 mutex_lock(&sessions_mutex
);
522 if (!session
->active
) {
526 WRITE_ONCE(session
->active
, 0);
528 /* Set transient enabler state to "disabled" */
529 session
->priv
->tstate
= 0;
530 lttng_session_sync_event_enablers(session
);
532 /* Set each stream's quiescent state. */
533 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
534 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
535 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
538 mutex_unlock(&sessions_mutex
);
542 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
545 struct lttng_kernel_channel_buffer_private
*chan_priv
;
546 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
547 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
548 struct lttng_metadata_stream
*stream
;
550 mutex_lock(&sessions_mutex
);
551 if (!session
->active
) {
556 mutex_lock(&cache
->lock
);
557 memset(cache
->data
, 0, cache
->cache_alloc
);
558 cache
->metadata_written
= 0;
560 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
561 stream
->metadata_out
= 0;
562 stream
->metadata_in
= 0;
564 mutex_unlock(&cache
->lock
);
566 session
->priv
->metadata_dumped
= 0;
567 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
568 chan_priv
->metadata_dumped
= 0;
571 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
572 event_recorder_priv
->metadata_dumped
= 0;
575 ret
= _lttng_session_metadata_statedump(session
);
578 mutex_unlock(&sessions_mutex
);
582 int lttng_channel_enable(struct lttng_kernel_channel_buffer
*channel
)
586 mutex_lock(&sessions_mutex
);
587 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
591 if (channel
->parent
.enabled
) {
595 /* Set transient enabler state to "enabled" */
596 channel
->priv
->parent
.tstate
= 1;
597 lttng_session_sync_event_enablers(channel
->parent
.session
);
598 /* Set atomically the state to "enabled" */
599 WRITE_ONCE(channel
->parent
.enabled
, 1);
601 mutex_unlock(&sessions_mutex
);
605 int lttng_channel_disable(struct lttng_kernel_channel_buffer
*channel
)
609 mutex_lock(&sessions_mutex
);
610 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
614 if (!channel
->parent
.enabled
) {
618 /* Set atomically the state to "disabled" */
619 WRITE_ONCE(channel
->parent
.enabled
, 0);
620 /* Set transient enabler state to "enabled" */
621 channel
->priv
->parent
.tstate
= 0;
622 lttng_session_sync_event_enablers(channel
->parent
.session
);
624 mutex_unlock(&sessions_mutex
);
628 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
632 mutex_lock(&sessions_mutex
);
633 switch (event
->type
) {
634 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
636 struct lttng_kernel_event_recorder
*event_recorder
=
637 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
639 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
645 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
646 switch (event
->priv
->instrumentation
) {
647 case LTTNG_KERNEL_ABI_KRETPROBE
:
658 if (event
->enabled
) {
662 switch (event
->priv
->instrumentation
) {
663 case LTTNG_KERNEL_ABI_TRACEPOINT
:
665 case LTTNG_KERNEL_ABI_SYSCALL
:
669 case LTTNG_KERNEL_ABI_KPROBE
:
671 case LTTNG_KERNEL_ABI_UPROBE
:
672 WRITE_ONCE(event
->enabled
, 1);
675 case LTTNG_KERNEL_ABI_KRETPROBE
:
676 ret
= lttng_kretprobes_event_enable_state(event
, 1);
679 case LTTNG_KERNEL_ABI_FUNCTION
:
681 case LTTNG_KERNEL_ABI_NOOP
:
688 mutex_unlock(&sessions_mutex
);
692 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
696 mutex_lock(&sessions_mutex
);
697 switch (event
->type
) {
698 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
700 struct lttng_kernel_event_recorder
*event_recorder
=
701 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
703 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
709 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
710 switch (event
->priv
->instrumentation
) {
711 case LTTNG_KERNEL_ABI_KRETPROBE
:
722 if (!event
->enabled
) {
726 switch (event
->priv
->instrumentation
) {
727 case LTTNG_KERNEL_ABI_TRACEPOINT
:
729 case LTTNG_KERNEL_ABI_SYSCALL
:
733 case LTTNG_KERNEL_ABI_KPROBE
:
735 case LTTNG_KERNEL_ABI_UPROBE
:
736 WRITE_ONCE(event
->enabled
, 0);
739 case LTTNG_KERNEL_ABI_KRETPROBE
:
740 ret
= lttng_kretprobes_event_enable_state(event
, 0);
743 case LTTNG_KERNEL_ABI_FUNCTION
:
745 case LTTNG_KERNEL_ABI_NOOP
:
752 mutex_unlock(&sessions_mutex
);
756 struct lttng_kernel_channel_buffer
*lttng_channel_create(struct lttng_kernel_session
*session
,
757 const char *transport_name
,
759 size_t subbuf_size
, size_t num_subbuf
,
760 unsigned int switch_timer_interval
,
761 unsigned int read_timer_interval
,
762 enum channel_type channel_type
)
764 struct lttng_kernel_channel_buffer
*chan
;
765 struct lttng_kernel_channel_buffer_private
*chan_priv
;
766 struct lttng_transport
*transport
= NULL
;
768 mutex_lock(&sessions_mutex
);
769 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
770 goto active
; /* Refuse to add channel to active session */
771 transport
= lttng_transport_find(transport_name
);
773 printk(KERN_WARNING
"LTTng: transport %s not found\n",
777 if (!try_module_get(transport
->owner
)) {
778 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
781 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
784 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
787 chan
->priv
= chan_priv
;
788 chan_priv
->pub
= chan
;
789 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
790 chan
->parent
.session
= session
;
791 chan
->priv
->id
= session
->priv
->free_chan_id
++;
792 chan
->ops
= &transport
->ops
;
794 * Note: the channel creation op already writes into the packet
795 * headers. Therefore the "chan" information used as input
796 * should be already accessible.
798 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
799 chan
, buf_addr
, subbuf_size
, num_subbuf
,
800 switch_timer_interval
, read_timer_interval
);
801 if (!chan
->priv
->rb_chan
)
803 chan
->priv
->parent
.tstate
= 1;
804 chan
->parent
.enabled
= 1;
805 chan
->priv
->transport
= transport
;
806 chan
->priv
->channel_type
= channel_type
;
807 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
808 mutex_unlock(&sessions_mutex
);
817 module_put(transport
->owner
);
820 mutex_unlock(&sessions_mutex
);
825 * Only used internally at session destruction for per-cpu channels, and
826 * when metadata channel is released.
827 * Needs to be called with sessions mutex held.
830 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
832 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
833 module_put(chan
->priv
->transport
->owner
);
834 list_del(&chan
->priv
->node
);
835 lttng_kernel_destroy_context(chan
->priv
->ctx
);
840 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
842 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
844 /* Protect the metadata cache with the sessions_mutex. */
845 mutex_lock(&sessions_mutex
);
846 _lttng_channel_destroy(chan
);
847 mutex_unlock(&sessions_mutex
);
849 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
852 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
854 stream
->finalized
= 1;
855 wake_up_interruptible(&stream
->read_wait
);
860 * Supports event creation while tracing session is active.
861 * Needs to be called with sessions mutex held.
863 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
864 struct lttng_kernel_abi_event
*event_param
,
865 const struct lttng_kernel_event_desc
*event_desc
,
866 enum lttng_kernel_abi_instrumentation itype
)
868 struct lttng_kernel_session
*session
= chan
->parent
.session
;
869 struct lttng_kernel_event_recorder
*event_recorder
;
870 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
871 const char *event_name
;
872 struct hlist_head
*head
;
875 if (chan
->priv
->free_event_id
== -1U) {
881 case LTTNG_KERNEL_ABI_TRACEPOINT
:
882 event_name
= event_desc
->event_name
;
885 case LTTNG_KERNEL_ABI_KPROBE
:
887 case LTTNG_KERNEL_ABI_UPROBE
:
889 case LTTNG_KERNEL_ABI_KRETPROBE
:
891 case LTTNG_KERNEL_ABI_SYSCALL
:
892 event_name
= event_param
->name
;
895 case LTTNG_KERNEL_ABI_FUNCTION
:
897 case LTTNG_KERNEL_ABI_NOOP
:
905 head
= utils_borrow_hash_table_bucket(session
->priv
->events_ht
.table
,
906 LTTNG_EVENT_HT_SIZE
, event_name
);
907 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
908 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
909 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
910 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
911 && chan
== event_recorder_priv
->pub
->chan
) {
917 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
918 if (!event_recorder
) {
922 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
923 if (!event_recorder_priv
) {
925 goto cache_private_error
;
927 event_recorder_priv
->pub
= event_recorder
;
928 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
929 event_recorder
->priv
= event_recorder_priv
;
930 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
931 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
933 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
934 event_recorder
->chan
= chan
;
935 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
936 event_recorder
->priv
->parent
.instrumentation
= itype
;
937 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
938 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
941 case LTTNG_KERNEL_ABI_TRACEPOINT
:
942 /* Event will be enabled by enabler sync. */
943 event_recorder
->parent
.enabled
= 0;
944 event_recorder
->priv
->parent
.registered
= 0;
945 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
946 if (!event_recorder
->priv
->parent
.desc
) {
950 /* Populate lttng_event structure before event registration. */
954 case LTTNG_KERNEL_ABI_KPROBE
:
956 * Needs to be explicitly enabled after creation, since
957 * we may want to apply filters.
959 event_recorder
->parent
.enabled
= 0;
960 event_recorder
->priv
->parent
.registered
= 1;
962 * Populate lttng_event structure before event
966 ret
= lttng_kprobes_register_event(event_name
,
967 event_param
->u
.kprobe
.symbol_name
,
968 event_param
->u
.kprobe
.offset
,
969 event_param
->u
.kprobe
.addr
,
975 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
979 case LTTNG_KERNEL_ABI_KRETPROBE
:
981 struct lttng_kernel_event_recorder
*event_recorder_return
;
982 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
984 /* kretprobe defines 2 events */
986 * Needs to be explicitly enabled after creation, since
987 * we may want to apply filters.
989 event_recorder
->parent
.enabled
= 0;
990 event_recorder
->priv
->parent
.registered
= 1;
992 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
993 if (!event_recorder_return
) {
997 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
998 if (!event_recorder_return_priv
) {
999 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1001 goto register_error
;
1003 event_recorder_return_priv
->pub
= event_recorder_return
;
1004 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
1005 event_recorder_return
->priv
= event_recorder_return_priv
;
1006 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
1007 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
1009 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1010 event_recorder_return
->chan
= chan
;
1011 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
1012 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
1013 event_recorder_return
->parent
.enabled
= 0;
1014 event_recorder_return
->priv
->parent
.registered
= 1;
1015 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1016 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1018 * Populate lttng_event structure before kretprobe registration.
1021 ret
= lttng_kretprobes_register(event_name
,
1022 event_param
->u
.kretprobe
.symbol_name
,
1023 event_param
->u
.kretprobe
.offset
,
1024 event_param
->u
.kretprobe
.addr
,
1025 event_recorder
, event_recorder_return
);
1027 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1028 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1030 goto register_error
;
1032 /* Take 2 refs on the module: one per event. */
1033 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1035 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1037 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1038 event_recorder_return
);
1039 WARN_ON_ONCE(ret
> 0);
1041 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1042 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1043 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1044 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1045 goto statedump_error
;
1047 list_add(&event_recorder_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1051 case LTTNG_KERNEL_ABI_SYSCALL
:
1053 * Needs to be explicitly enabled after creation, since
1054 * we may want to apply filters.
1056 event_recorder
->parent
.enabled
= 0;
1057 event_recorder
->priv
->parent
.registered
= 0;
1058 event_recorder
->priv
->parent
.desc
= event_desc
;
1059 switch (event_param
->u
.syscall
.entryexit
) {
1060 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1062 goto register_error
;
1063 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1064 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1066 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1067 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1070 switch (event_param
->u
.syscall
.abi
) {
1071 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1073 goto register_error
;
1074 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1075 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1077 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1078 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1081 if (!event_recorder
->priv
->parent
.desc
) {
1083 goto register_error
;
1087 case LTTNG_KERNEL_ABI_UPROBE
:
1089 * Needs to be explicitly enabled after creation, since
1090 * we may want to apply filters.
1092 event_recorder
->parent
.enabled
= 0;
1093 event_recorder
->priv
->parent
.registered
= 1;
1096 * Populate lttng_event structure before event
1101 ret
= lttng_uprobes_register_event(event_param
->name
,
1102 event_param
->u
.uprobe
.fd
,
1105 goto register_error
;
1106 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1110 case LTTNG_KERNEL_ABI_FUNCTION
:
1112 case LTTNG_KERNEL_ABI_NOOP
:
1117 goto register_error
;
1119 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1120 WARN_ON_ONCE(ret
> 0);
1122 goto statedump_error
;
1124 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1125 list_add(&event_recorder
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1126 return event_recorder
;
1129 /* If a statedump error occurs, events will not be readable. */
1131 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1132 cache_private_error
:
1133 kmem_cache_free(event_recorder_cache
, event_recorder
);
1138 return ERR_PTR(ret
);
1141 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1142 const struct lttng_kernel_event_desc
*event_desc
,
1143 uint64_t token
, uint64_t error_counter_index
,
1144 struct lttng_event_notifier_group
*event_notifier_group
,
1145 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1146 enum lttng_kernel_abi_instrumentation itype
)
1148 struct lttng_kernel_event_notifier
*event_notifier
;
1149 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1150 struct lttng_counter
*error_counter
;
1151 const char *event_name
;
1152 struct hlist_head
*head
;
1156 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1157 event_name
= event_desc
->event_name
;
1160 case LTTNG_KERNEL_ABI_KPROBE
:
1162 case LTTNG_KERNEL_ABI_UPROBE
:
1164 case LTTNG_KERNEL_ABI_SYSCALL
:
1165 event_name
= event_notifier_param
->event
.name
;
1168 case LTTNG_KERNEL_ABI_KRETPROBE
:
1170 case LTTNG_KERNEL_ABI_FUNCTION
:
1172 case LTTNG_KERNEL_ABI_NOOP
:
1180 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1181 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1182 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1183 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1184 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1185 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1186 && event_notifier_group
== event_notifier_priv
->group
1187 && token
== event_notifier_priv
->parent
.user_token
) {
1193 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1194 if (!event_notifier
) {
1198 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1199 if (!event_notifier_priv
) {
1201 goto cache_private_error
;
1203 event_notifier_priv
->pub
= event_notifier
;
1204 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1205 event_notifier
->priv
= event_notifier_priv
;
1206 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1207 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1209 event_notifier
->priv
->group
= event_notifier_group
;
1210 event_notifier
->priv
->parent
.user_token
= token
;
1211 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1212 event_notifier
->priv
->num_captures
= 0;
1213 event_notifier
->priv
->parent
.instrumentation
= itype
;
1214 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1215 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1216 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1217 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1218 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1221 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1222 /* Event will be enabled by enabler sync. */
1223 event_notifier
->parent
.enabled
= 0;
1224 event_notifier
->priv
->parent
.registered
= 0;
1225 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1226 if (!event_notifier
->priv
->parent
.desc
) {
1228 goto register_error
;
1230 /* Populate lttng_event_notifier structure before event registration. */
1234 case LTTNG_KERNEL_ABI_KPROBE
:
1236 * Needs to be explicitly enabled after creation, since
1237 * we may want to apply filters.
1239 event_notifier
->parent
.enabled
= 0;
1240 event_notifier
->priv
->parent
.registered
= 1;
1242 * Populate lttng_event_notifier structure before event
1246 ret
= lttng_kprobes_register_event_notifier(
1247 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1248 event_notifier_param
->event
.u
.kprobe
.offset
,
1249 event_notifier_param
->event
.u
.kprobe
.addr
,
1253 goto register_error
;
1255 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1259 case LTTNG_KERNEL_ABI_SYSCALL
:
1261 * Needs to be explicitly enabled after creation, since
1262 * we may want to apply filters.
1264 event_notifier
->parent
.enabled
= 0;
1265 event_notifier
->priv
->parent
.registered
= 0;
1266 event_notifier
->priv
->parent
.desc
= event_desc
;
1267 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1268 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1270 goto register_error
;
1271 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1272 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1274 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1275 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1278 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1279 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1281 goto register_error
;
1282 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1283 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1285 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1286 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1290 if (!event_notifier
->priv
->parent
.desc
) {
1292 goto register_error
;
1296 case LTTNG_KERNEL_ABI_UPROBE
:
1298 * Needs to be explicitly enabled after creation, since
1299 * we may want to apply filters.
1301 event_notifier
->parent
.enabled
= 0;
1302 event_notifier
->priv
->parent
.registered
= 1;
1305 * Populate lttng_event_notifier structure before
1306 * event_notifier registration.
1310 ret
= lttng_uprobes_register_event_notifier(
1311 event_notifier_param
->event
.name
,
1312 event_notifier_param
->event
.u
.uprobe
.fd
,
1315 goto register_error
;
1316 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1320 case LTTNG_KERNEL_ABI_KRETPROBE
:
1322 case LTTNG_KERNEL_ABI_FUNCTION
:
1324 case LTTNG_KERNEL_ABI_NOOP
:
1329 goto register_error
;
1332 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1333 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1336 * Clear the error counter bucket. The sessiond keeps track of which
1337 * bucket is currently in use. We trust it. The session lock
1338 * synchronizes against concurrent creation of the error
1341 error_counter
= event_notifier_group
->error_counter
;
1342 if (error_counter
) {
1343 size_t dimension_index
[1];
1346 * Check that the index is within the boundary of the counter.
1348 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1349 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1350 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1352 goto register_error
;
1355 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1356 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1358 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1359 event_notifier
->priv
->error_counter_index
);
1360 goto register_error
;
1364 return event_notifier
;
1367 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1368 cache_private_error
:
1369 kmem_cache_free(event_notifier_cache
, event_notifier
);
1373 return ERR_PTR(ret
);
1376 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1377 const size_t *dim_indexes
, int32_t cpu
,
1378 int64_t *val
, bool *overflow
, bool *underflow
)
1380 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1381 cpu
, val
, overflow
, underflow
);
1384 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1385 const size_t *dim_indexes
, int64_t *val
,
1386 bool *overflow
, bool *underflow
)
1388 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1389 val
, overflow
, underflow
);
1392 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1393 const size_t *dim_indexes
)
1395 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1398 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
1399 struct lttng_kernel_abi_event
*event_param
,
1400 const struct lttng_kernel_event_desc
*event_desc
,
1401 enum lttng_kernel_abi_instrumentation itype
)
1403 struct lttng_kernel_event_recorder
*event
;
1405 mutex_lock(&sessions_mutex
);
1406 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1407 mutex_unlock(&sessions_mutex
);
1411 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1412 const struct lttng_kernel_event_desc
*event_desc
,
1413 uint64_t id
, uint64_t error_counter_index
,
1414 struct lttng_event_notifier_group
*event_notifier_group
,
1415 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1416 enum lttng_kernel_abi_instrumentation itype
)
1418 struct lttng_kernel_event_notifier
*event_notifier
;
1420 mutex_lock(&sessions_mutex
);
1421 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1422 error_counter_index
, event_notifier_group
,
1423 event_notifier_param
, itype
);
1424 mutex_unlock(&sessions_mutex
);
1425 return event_notifier
;
1428 /* Only used for tracepoints for now. */
1430 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1432 const struct lttng_kernel_event_desc
*desc
;
1435 if (event_recorder
->priv
->parent
.registered
)
1438 desc
= event_recorder
->priv
->parent
.desc
;
1439 switch (event_recorder
->priv
->parent
.instrumentation
) {
1440 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1441 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1442 desc
->tp_class
->probe_callback
,
1446 case LTTNG_KERNEL_ABI_SYSCALL
:
1447 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1450 case LTTNG_KERNEL_ABI_KPROBE
:
1452 case LTTNG_KERNEL_ABI_UPROBE
:
1454 case LTTNG_KERNEL_ABI_KRETPROBE
:
1458 case LTTNG_KERNEL_ABI_FUNCTION
:
1460 case LTTNG_KERNEL_ABI_NOOP
:
1466 event_recorder
->priv
->parent
.registered
= 1;
1470 * Only used internally at session destruction.
1472 int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1474 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1475 const struct lttng_kernel_event_desc
*desc
;
1478 if (!event_priv
->registered
)
1481 desc
= event_priv
->desc
;
1482 switch (event_priv
->instrumentation
) {
1483 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1484 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1485 event_priv
->desc
->tp_class
->probe_callback
,
1489 case LTTNG_KERNEL_ABI_KPROBE
:
1490 lttng_kprobes_unregister_event(event_recorder
);
1494 case LTTNG_KERNEL_ABI_KRETPROBE
:
1495 lttng_kretprobes_unregister(event_recorder
);
1499 case LTTNG_KERNEL_ABI_SYSCALL
:
1500 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1503 case LTTNG_KERNEL_ABI_NOOP
:
1507 case LTTNG_KERNEL_ABI_UPROBE
:
1508 lttng_uprobes_unregister_event(event_recorder
);
1512 case LTTNG_KERNEL_ABI_FUNCTION
:
1518 event_priv
->registered
= 0;
1522 /* Only used for tracepoints for now. */
1524 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1526 const struct lttng_kernel_event_desc
*desc
;
1529 if (event_notifier
->priv
->parent
.registered
)
1532 desc
= event_notifier
->priv
->parent
.desc
;
1533 switch (event_notifier
->priv
->parent
.instrumentation
) {
1534 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1535 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1536 desc
->tp_class
->probe_callback
,
1540 case LTTNG_KERNEL_ABI_SYSCALL
:
1541 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1544 case LTTNG_KERNEL_ABI_KPROBE
:
1546 case LTTNG_KERNEL_ABI_UPROBE
:
1550 case LTTNG_KERNEL_ABI_KRETPROBE
:
1552 case LTTNG_KERNEL_ABI_FUNCTION
:
1554 case LTTNG_KERNEL_ABI_NOOP
:
1560 event_notifier
->priv
->parent
.registered
= 1;
1564 int _lttng_event_notifier_unregister(
1565 struct lttng_kernel_event_notifier
*event_notifier
)
1567 const struct lttng_kernel_event_desc
*desc
;
1570 if (!event_notifier
->priv
->parent
.registered
)
1573 desc
= event_notifier
->priv
->parent
.desc
;
1574 switch (event_notifier
->priv
->parent
.instrumentation
) {
1575 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1576 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1577 event_notifier
->priv
->parent
.desc
->tp_class
->probe_callback
,
1581 case LTTNG_KERNEL_ABI_KPROBE
:
1582 lttng_kprobes_unregister_event_notifier(event_notifier
);
1586 case LTTNG_KERNEL_ABI_UPROBE
:
1587 lttng_uprobes_unregister_event_notifier(event_notifier
);
1591 case LTTNG_KERNEL_ABI_SYSCALL
:
1592 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1595 case LTTNG_KERNEL_ABI_KRETPROBE
:
1597 case LTTNG_KERNEL_ABI_FUNCTION
:
1599 case LTTNG_KERNEL_ABI_NOOP
:
1605 event_notifier
->priv
->parent
.registered
= 0;
1610 * Only used internally at session destruction.
1613 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1615 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1616 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1618 lttng_free_event_filter_runtime(event
);
1619 /* Free event enabler refs */
1620 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1621 &event_priv
->enablers_ref_head
, node
)
1624 switch (event
->type
) {
1625 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1627 struct lttng_kernel_event_recorder
*event_recorder
=
1628 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1630 switch (event_priv
->instrumentation
) {
1631 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1632 lttng_event_desc_put(event_priv
->desc
);
1635 case LTTNG_KERNEL_ABI_KPROBE
:
1636 module_put(event_priv
->desc
->owner
);
1637 lttng_kprobes_destroy_event_private(event_recorder
);
1640 case LTTNG_KERNEL_ABI_KRETPROBE
:
1641 module_put(event_priv
->desc
->owner
);
1642 lttng_kretprobes_destroy_private(event_recorder
);
1645 case LTTNG_KERNEL_ABI_SYSCALL
:
1648 case LTTNG_KERNEL_ABI_UPROBE
:
1649 module_put(event_priv
->desc
->owner
);
1650 lttng_uprobes_destroy_event_private(event_recorder
);
1653 case LTTNG_KERNEL_ABI_FUNCTION
:
1655 case LTTNG_KERNEL_ABI_NOOP
:
1660 list_del(&event_recorder
->priv
->node
);
1661 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1662 kmem_cache_free(event_recorder_cache
, event_recorder
);
1665 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1667 struct lttng_kernel_event_notifier
*event_notifier
=
1668 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1670 switch (event_notifier
->priv
->parent
.instrumentation
) {
1671 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1672 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1675 case LTTNG_KERNEL_ABI_KPROBE
:
1676 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1677 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1680 case LTTNG_KERNEL_ABI_SYSCALL
:
1683 case LTTNG_KERNEL_ABI_UPROBE
:
1684 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1685 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1688 case LTTNG_KERNEL_ABI_KRETPROBE
:
1690 case LTTNG_KERNEL_ABI_FUNCTION
:
1692 case LTTNG_KERNEL_ABI_NOOP
:
1697 list_del(&event_notifier
->priv
->node
);
1698 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1699 kmem_cache_free(event_notifier_cache
, event_notifier
);
1707 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1708 enum tracker_type tracker_type
)
1710 switch (tracker_type
) {
1712 return &session
->pid_tracker
;
1714 return &session
->vpid_tracker
;
1716 return &session
->uid_tracker
;
1718 return &session
->vuid_tracker
;
1720 return &session
->gid_tracker
;
1722 return &session
->vgid_tracker
;
1729 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1730 enum tracker_type tracker_type
, int id
)
1732 struct lttng_kernel_id_tracker
*tracker
;
1735 tracker
= get_tracker(session
, tracker_type
);
1740 mutex_lock(&sessions_mutex
);
1742 /* track all ids: destroy tracker. */
1743 lttng_id_tracker_destroy(tracker
, true);
1746 ret
= lttng_id_tracker_add(tracker
, id
);
1748 mutex_unlock(&sessions_mutex
);
1752 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1753 enum tracker_type tracker_type
, int id
)
1755 struct lttng_kernel_id_tracker
*tracker
;
1758 tracker
= get_tracker(session
, tracker_type
);
1763 mutex_lock(&sessions_mutex
);
1765 /* untrack all ids: replace by empty tracker. */
1766 ret
= lttng_id_tracker_empty_set(tracker
);
1768 ret
= lttng_id_tracker_del(tracker
, id
);
1770 mutex_unlock(&sessions_mutex
);
1775 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1777 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1778 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1779 struct lttng_id_hash_node
*e
;
1782 mutex_lock(&sessions_mutex
);
1784 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1785 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1787 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1793 /* ID tracker disabled. */
1794 if (iter
>= *pos
&& iter
== 0) {
1795 return id_tracker_p
; /* empty tracker */
1803 /* Called with sessions_mutex held. */
1805 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1807 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1808 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1809 struct lttng_id_hash_node
*e
;
1814 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1815 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1817 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1818 if (iter
++ >= *ppos
)
1823 /* ID tracker disabled. */
1824 if (iter
>= *ppos
&& iter
== 0)
1825 return p
; /* empty tracker */
1834 void id_list_stop(struct seq_file
*m
, void *p
)
1836 mutex_unlock(&sessions_mutex
);
1840 int id_list_show(struct seq_file
*m
, void *p
)
1842 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1843 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1846 if (p
== id_tracker_p
) {
1847 /* Tracker disabled. */
1850 const struct lttng_id_hash_node
*e
= p
;
1852 id
= lttng_id_tracker_get_node_id(e
);
1854 switch (id_tracker
->priv
->tracker_type
) {
1856 seq_printf(m
, "process { pid = %d; };\n", id
);
1859 seq_printf(m
, "process { vpid = %d; };\n", id
);
1862 seq_printf(m
, "user { uid = %d; };\n", id
);
1865 seq_printf(m
, "user { vuid = %d; };\n", id
);
1868 seq_printf(m
, "group { gid = %d; };\n", id
);
1871 seq_printf(m
, "group { vgid = %d; };\n", id
);
1874 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1880 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1881 .start
= id_list_start
,
1882 .next
= id_list_next
,
1883 .stop
= id_list_stop
,
1884 .show
= id_list_show
,
1888 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1890 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1894 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1896 struct seq_file
*m
= file
->private_data
;
1897 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1900 WARN_ON_ONCE(!id_tracker
);
1901 ret
= seq_release(inode
, file
);
1903 fput(id_tracker
->priv
->session
->priv
->file
);
1907 const struct file_operations lttng_tracker_ids_list_fops
= {
1908 .owner
= THIS_MODULE
,
1909 .open
= lttng_tracker_ids_list_open
,
1911 .llseek
= seq_lseek
,
1912 .release
= lttng_tracker_ids_list_release
,
1915 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1916 enum tracker_type tracker_type
)
1918 struct file
*tracker_ids_list_file
;
1922 file_fd
= lttng_get_unused_fd();
1928 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1929 <tng_tracker_ids_list_fops
,
1931 if (IS_ERR(tracker_ids_list_file
)) {
1932 ret
= PTR_ERR(tracker_ids_list_file
);
1935 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1937 goto refcount_error
;
1939 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1942 m
= tracker_ids_list_file
->private_data
;
1944 m
->private = get_tracker(session
, tracker_type
);
1945 BUG_ON(!m
->private);
1946 fd_install(file_fd
, tracker_ids_list_file
);
1951 atomic_long_dec(&session
->priv
->file
->f_count
);
1953 fput(tracker_ids_list_file
);
1955 put_unused_fd(file_fd
);
1961 * Enabler management.
1964 int lttng_match_enabler_star_glob(const char *desc_name
,
1965 const char *pattern
)
1967 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1968 desc_name
, LTTNG_SIZE_MAX
))
1974 int lttng_match_enabler_name(const char *desc_name
,
1977 if (strcmp(desc_name
, name
))
1982 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1983 struct lttng_enabler
*enabler
)
1985 const char *desc_name
, *enabler_name
;
1986 bool compat
= false, entry
= false;
1988 enabler_name
= enabler
->event_param
.name
;
1989 switch (enabler
->event_param
.instrumentation
) {
1990 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1991 desc_name
= desc
->event_name
;
1992 switch (enabler
->format_type
) {
1993 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1994 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1995 case LTTNG_ENABLER_FORMAT_NAME
:
1996 return lttng_match_enabler_name(desc_name
, enabler_name
);
2002 case LTTNG_KERNEL_ABI_SYSCALL
:
2003 desc_name
= desc
->event_name
;
2004 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2005 desc_name
+= strlen("compat_");
2008 if (!strncmp(desc_name
, "syscall_exit_",
2009 strlen("syscall_exit_"))) {
2010 desc_name
+= strlen("syscall_exit_");
2011 } else if (!strncmp(desc_name
, "syscall_entry_",
2012 strlen("syscall_entry_"))) {
2013 desc_name
+= strlen("syscall_entry_");
2019 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2020 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2022 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2026 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2033 switch (enabler
->event_param
.u
.syscall
.abi
) {
2034 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2036 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2040 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2047 switch (enabler
->event_param
.u
.syscall
.match
) {
2048 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2049 switch (enabler
->format_type
) {
2050 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2051 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2052 case LTTNG_ENABLER_FORMAT_NAME
:
2053 return lttng_match_enabler_name(desc_name
, enabler_name
);
2058 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2059 return -EINVAL
; /* Not implemented. */
2072 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2073 struct lttng_kernel_event_recorder
*event_recorder
)
2075 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2078 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2080 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2081 && event_recorder
->chan
== event_enabler
->chan
)
2088 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2089 struct lttng_kernel_event_notifier
*event_notifier
)
2091 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2092 event_notifier_enabler
);
2094 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2096 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2097 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2098 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2105 struct lttng_enabler_ref
*lttng_enabler_ref(
2106 struct list_head
*enablers_ref_list
,
2107 struct lttng_enabler
*enabler
)
2109 struct lttng_enabler_ref
*enabler_ref
;
2111 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2112 if (enabler_ref
->ref
== enabler
)
2119 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2121 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2122 struct lttng_kernel_probe_desc
*probe_desc
;
2123 const struct lttng_kernel_event_desc
*desc
;
2125 struct list_head
*probe_list
;
2127 probe_list
= lttng_get_probe_list_head();
2129 * For each probe event, if we find that a probe event matches
2130 * our enabler, create an associated lttng_event if not
2133 list_for_each_entry(probe_desc
, probe_list
, head
) {
2134 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2136 struct hlist_head
*head
;
2137 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2138 struct lttng_kernel_event_recorder
*event_recorder
;
2140 desc
= probe_desc
->event_desc
[i
];
2141 if (!lttng_desc_match_enabler(desc
,
2142 lttng_event_enabler_as_enabler(event_enabler
)))
2146 * Check if already created.
2148 head
= utils_borrow_hash_table_bucket(
2149 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2151 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2152 if (event_recorder_private
->parent
.desc
== desc
2153 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2160 * We need to create an event for this
2163 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2164 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2165 if (!event_recorder
) {
2166 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2167 probe_desc
->event_desc
[i
]->event_name
);
2174 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2176 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2177 struct lttng_kernel_probe_desc
*probe_desc
;
2178 const struct lttng_kernel_event_desc
*desc
;
2180 struct list_head
*probe_list
;
2182 probe_list
= lttng_get_probe_list_head();
2184 * For each probe event, if we find that a probe event matches
2185 * our enabler, create an associated lttng_event_notifier if not
2188 list_for_each_entry(probe_desc
, probe_list
, head
) {
2189 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2191 struct hlist_head
*head
;
2192 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2193 struct lttng_kernel_event_notifier
*event_notifier
;
2195 desc
= probe_desc
->event_desc
[i
];
2196 if (!lttng_desc_match_enabler(desc
,
2197 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2201 * Check if already created.
2203 head
= utils_borrow_hash_table_bucket(
2204 event_notifier_group
->event_notifiers_ht
.table
,
2205 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2206 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2207 if (event_notifier_priv
->parent
.desc
== desc
2208 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2215 * We need to create a event_notifier for this event probe.
2217 event_notifier
= _lttng_event_notifier_create(desc
,
2218 event_notifier_enabler
->base
.user_token
,
2219 event_notifier_enabler
->error_counter_index
,
2220 event_notifier_group
, NULL
,
2221 LTTNG_KERNEL_ABI_TRACEPOINT
);
2222 if (IS_ERR(event_notifier
)) {
2223 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2224 probe_desc
->event_desc
[i
]->event_name
);
2231 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2235 ret
= lttng_syscalls_register_event(event_enabler
);
2240 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2244 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2246 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2251 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2252 * tracepoint probes.
2253 * Should be called with sessions mutex held.
2256 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2258 switch (event_enabler
->base
.event_param
.instrumentation
) {
2259 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2260 lttng_create_tracepoint_event_if_missing(event_enabler
);
2263 case LTTNG_KERNEL_ABI_SYSCALL
:
2264 lttng_create_syscall_event_if_missing(event_enabler
);
2274 * Create events associated with an event_enabler (if not already present),
2275 * and add backward reference from the event to the enabler.
2276 * Should be called with sessions mutex held.
2279 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2281 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2282 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2283 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2284 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2286 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2287 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2288 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2289 !strcmp(base_enabler
->event_param
.name
, "*")) {
2290 int enabled
= base_enabler
->enabled
;
2291 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2293 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2294 WRITE_ONCE(chan
->priv
->parent
.syscall_all_entry
, enabled
);
2296 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2297 WRITE_ONCE(chan
->priv
->parent
.syscall_all_exit
, enabled
);
2300 /* First ensure that probe events are created for this enabler. */
2301 lttng_create_event_if_missing(event_enabler
);
2303 /* For each event matching event_enabler in session event list. */
2304 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2305 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2306 struct lttng_enabler_ref
*enabler_ref
;
2308 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2310 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2311 lttng_event_enabler_as_enabler(event_enabler
));
2314 * If no backward ref, create it.
2315 * Add backward ref from event to event_enabler.
2317 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2320 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2321 list_add(&enabler_ref
->node
,
2322 &event_recorder_priv
->parent
.enablers_ref_head
);
2326 * Link filter bytecodes if not linked yet.
2328 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2330 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2331 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2337 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2338 * tracepoint probes.
2339 * Should be called with sessions mutex held.
2342 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2344 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2345 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2346 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2349 case LTTNG_KERNEL_ABI_SYSCALL
:
2350 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2360 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2363 int lttng_event_notifier_enabler_ref_event_notifiers(
2364 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2366 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2367 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2368 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2370 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2371 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2372 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2373 !strcmp(base_enabler
->event_param
.name
, "*")) {
2375 int enabled
= base_enabler
->enabled
;
2376 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2378 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2379 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2381 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2382 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2386 /* First ensure that probe event_notifiers are created for this enabler. */
2387 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2389 /* Link the created event_notifier with its associated enabler. */
2390 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2391 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2392 struct lttng_enabler_ref
*enabler_ref
;
2394 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2397 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2398 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2401 * If no backward ref, create it.
2402 * Add backward ref from event_notifier to enabler.
2404 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2408 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2409 event_notifier_enabler
);
2410 list_add(&enabler_ref
->node
,
2411 &event_notifier_priv
->parent
.enablers_ref_head
);
2415 * Link filter bytecodes if not linked yet.
2417 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2418 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2419 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2421 /* Link capture bytecodes if not linked yet. */
2422 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2423 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2424 &event_notifier_enabler
->capture_bytecode_head
);
2426 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2432 * Called at module load: connect the probe on all enablers matching
2434 * Called with sessions lock held.
2436 int lttng_fix_pending_events(void)
2438 struct lttng_kernel_session_private
*session_priv
;
2440 list_for_each_entry(session_priv
, &sessions
, list
)
2441 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2445 static bool lttng_event_notifier_group_has_active_event_notifiers(
2446 struct lttng_event_notifier_group
*event_notifier_group
)
2448 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2450 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2452 if (event_notifier_enabler
->base
.enabled
)
2458 bool lttng_event_notifier_active(void)
2460 struct lttng_event_notifier_group
*event_notifier_group
;
2462 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2463 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2469 int lttng_fix_pending_event_notifiers(void)
2471 struct lttng_event_notifier_group
*event_notifier_group
;
2473 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2474 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2478 struct lttng_event_enabler
*lttng_event_enabler_create(
2479 enum lttng_enabler_format_type format_type
,
2480 struct lttng_kernel_abi_event
*event_param
,
2481 struct lttng_kernel_channel_buffer
*chan
)
2483 struct lttng_event_enabler
*event_enabler
;
2485 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2488 event_enabler
->base
.format_type
= format_type
;
2489 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2490 memcpy(&event_enabler
->base
.event_param
, event_param
,
2491 sizeof(event_enabler
->base
.event_param
));
2492 event_enabler
->chan
= chan
;
2494 event_enabler
->base
.enabled
= 0;
2495 mutex_lock(&sessions_mutex
);
2496 list_add(&event_enabler
->node
, &event_enabler
->chan
->parent
.session
->priv
->enablers_head
);
2497 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2498 mutex_unlock(&sessions_mutex
);
2499 return event_enabler
;
2502 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2504 mutex_lock(&sessions_mutex
);
2505 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2506 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2507 mutex_unlock(&sessions_mutex
);
2511 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2513 mutex_lock(&sessions_mutex
);
2514 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2515 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2516 mutex_unlock(&sessions_mutex
);
2521 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2522 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2524 struct lttng_kernel_bytecode_node
*bytecode_node
;
2525 uint32_t bytecode_len
;
2528 ret
= get_user(bytecode_len
, &bytecode
->len
);
2531 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2535 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2536 sizeof(*bytecode
) + bytecode_len
);
2540 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2541 bytecode_node
->enabler
= enabler
;
2542 /* Enforce length based on allocated size */
2543 bytecode_node
->bc
.len
= bytecode_len
;
2544 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2549 lttng_kvfree(bytecode_node
);
2553 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2554 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2557 ret
= lttng_enabler_attach_filter_bytecode(
2558 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2562 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2569 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2570 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2573 switch (event
->priv
->instrumentation
) {
2574 case LTTNG_KERNEL_ABI_UPROBE
:
2575 return lttng_uprobes_event_add_callsite(event
, callsite
);
2582 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2584 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2586 /* Destroy filter bytecode */
2587 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2588 &enabler
->filter_bytecode_head
, node
) {
2589 lttng_kvfree(filter_node
);
2594 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2596 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2598 list_del(&event_enabler
->node
);
2599 kfree(event_enabler
);
2602 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2603 struct lttng_event_notifier_group
*event_notifier_group
,
2604 enum lttng_enabler_format_type format_type
,
2605 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2607 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2609 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2610 if (!event_notifier_enabler
)
2613 event_notifier_enabler
->base
.format_type
= format_type
;
2614 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2615 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2617 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2618 event_notifier_enabler
->num_captures
= 0;
2620 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2621 sizeof(event_notifier_enabler
->base
.event_param
));
2623 event_notifier_enabler
->base
.enabled
= 0;
2624 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2625 event_notifier_enabler
->group
= event_notifier_group
;
2627 mutex_lock(&sessions_mutex
);
2628 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2629 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2631 mutex_unlock(&sessions_mutex
);
2633 return event_notifier_enabler
;
2636 int lttng_event_notifier_enabler_enable(
2637 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2639 mutex_lock(&sessions_mutex
);
2640 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2641 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2642 mutex_unlock(&sessions_mutex
);
2646 int lttng_event_notifier_enabler_disable(
2647 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2649 mutex_lock(&sessions_mutex
);
2650 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2651 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2652 mutex_unlock(&sessions_mutex
);
2656 int lttng_event_notifier_enabler_attach_filter_bytecode(
2657 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2658 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2662 ret
= lttng_enabler_attach_filter_bytecode(
2663 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2668 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2675 int lttng_event_notifier_enabler_attach_capture_bytecode(
2676 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2677 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2679 struct lttng_kernel_bytecode_node
*bytecode_node
;
2680 struct lttng_enabler
*enabler
=
2681 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2682 uint32_t bytecode_len
;
2685 ret
= get_user(bytecode_len
, &bytecode
->len
);
2689 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2694 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2695 sizeof(*bytecode
) + bytecode_len
);
2699 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2700 bytecode_node
->enabler
= enabler
;
2702 /* Enforce length based on allocated size */
2703 bytecode_node
->bc
.len
= bytecode_len
;
2704 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2706 event_notifier_enabler
->num_captures
++;
2708 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2712 lttng_kvfree(bytecode_node
);
2718 void lttng_event_notifier_enabler_destroy(
2719 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2721 if (!event_notifier_enabler
) {
2725 list_del(&event_notifier_enabler
->node
);
2727 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2728 kfree(event_notifier_enabler
);
2732 * lttng_session_sync_event_enablers should be called just before starting a
2734 * Should be called with sessions mutex held.
2737 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2739 struct lttng_event_enabler
*event_enabler
;
2740 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2742 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2743 lttng_event_enabler_ref_events(event_enabler
);
2745 * For each event, if at least one of its enablers is enabled,
2746 * and its channel and session transient states are enabled, we
2747 * enable the event, else we disable it.
2749 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2750 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2751 struct lttng_enabler_ref
*enabler_ref
;
2752 struct lttng_kernel_bytecode_runtime
*runtime
;
2753 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2756 switch (event_recorder_priv
->parent
.instrumentation
) {
2757 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2759 case LTTNG_KERNEL_ABI_SYSCALL
:
2761 list_for_each_entry(enabler_ref
,
2762 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2763 if (enabler_ref
->ref
->enabled
) {
2771 /* Not handled with lazy sync. */
2775 * Enabled state is based on union of enablers, with
2776 * intesection of session and channel transient enable
2779 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2781 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2783 * Sync tracepoint registration with event enabled
2787 register_event(event_recorder
);
2789 _lttng_event_unregister(event_recorder
);
2792 /* Check if has enablers without bytecode enabled */
2793 list_for_each_entry(enabler_ref
,
2794 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2795 if (enabler_ref
->ref
->enabled
2796 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2797 has_enablers_without_filter_bytecode
= 1;
2801 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2802 has_enablers_without_filter_bytecode
;
2804 /* Enable filters */
2805 list_for_each_entry(runtime
,
2806 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2807 lttng_bytecode_sync_state(runtime
);
2810 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2811 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2816 * Apply enablers to session events, adding events to session if need
2817 * be. It is required after each modification applied to an active
2818 * session, and right before session "start".
2819 * "lazy" sync means we only sync if required.
2820 * Should be called with sessions mutex held.
2823 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2825 /* We can skip if session is not active */
2826 if (!session
->active
)
2828 lttng_session_sync_event_enablers(session
);
2832 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2834 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2835 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2837 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2838 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2841 * For each event_notifier, if at least one of its enablers is enabled,
2842 * we enable the event_notifier, else we disable it.
2844 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2845 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2846 struct lttng_enabler_ref
*enabler_ref
;
2847 struct lttng_kernel_bytecode_runtime
*runtime
;
2848 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2849 int nr_filters
= 0, nr_captures
= 0;
2851 switch (event_notifier_priv
->parent
.instrumentation
) {
2852 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2854 case LTTNG_KERNEL_ABI_SYSCALL
:
2855 /* Enable event_notifiers */
2856 list_for_each_entry(enabler_ref
,
2857 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2858 if (enabler_ref
->ref
->enabled
) {
2866 /* Not handled with sync. */
2870 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2872 * Sync tracepoint registration with event_notifier enabled
2876 if (!event_notifier_priv
->parent
.registered
)
2877 register_event_notifier(event_notifier
);
2879 if (event_notifier_priv
->parent
.registered
)
2880 _lttng_event_notifier_unregister(event_notifier
);
2883 /* Check if has enablers without bytecode enabled */
2884 list_for_each_entry(enabler_ref
,
2885 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2886 if (enabler_ref
->ref
->enabled
2887 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2888 has_enablers_without_filter_bytecode
= 1;
2892 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2893 has_enablers_without_filter_bytecode
;
2895 /* Enable filters */
2896 list_for_each_entry(runtime
,
2897 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2898 lttng_bytecode_sync_state(runtime
);
2901 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2902 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2904 /* Enable captures */
2905 list_for_each_entry(runtime
,
2906 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2907 lttng_bytecode_sync_state(runtime
);
2910 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2915 * Serialize at most one packet worth of metadata into a metadata
2917 * We grab the metadata cache mutex to get exclusive access to our metadata
2918 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2919 * allows us to do racy operations such as looking for remaining space left in
2920 * packet and write, since mutual exclusion protects us from concurrent writes.
2921 * Mutual exclusion on the metadata cache allow us to read the cache content
2922 * without racing against reallocation of the cache by updates.
2923 * Returns the number of bytes written in the channel, 0 if no data
2924 * was written and a negative value on error.
2926 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2927 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2929 struct lttng_kernel_ring_buffer_ctx ctx
;
2931 size_t len
, reserve_len
;
2934 * Ensure we support mutiple get_next / put sequences followed by
2935 * put_next. The metadata cache lock protects reading the metadata
2936 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2937 * "flush" operations on the buffer invoked by different processes.
2938 * Moreover, since the metadata cache memory can be reallocated, we
2939 * need to have exclusive access against updates even though we only
2942 mutex_lock(&stream
->metadata_cache
->lock
);
2943 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2944 if (stream
->metadata_in
!= stream
->metadata_out
)
2947 /* Metadata regenerated, change the version. */
2948 if (stream
->metadata_cache
->version
!= stream
->version
)
2949 stream
->version
= stream
->metadata_cache
->version
;
2951 len
= stream
->metadata_cache
->metadata_written
-
2952 stream
->metadata_in
;
2955 reserve_len
= min_t(size_t,
2956 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2958 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2959 sizeof(char), NULL
);
2961 * If reservation failed, return an error to the caller.
2963 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2965 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2966 stream
->coherent
= false;
2969 stream
->transport
->ops
.event_write(&ctx
,
2970 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2972 stream
->transport
->ops
.event_commit(&ctx
);
2973 stream
->metadata_in
+= reserve_len
;
2974 if (reserve_len
< len
)
2975 stream
->coherent
= false;
2977 stream
->coherent
= true;
2982 *coherent
= stream
->coherent
;
2983 mutex_unlock(&stream
->metadata_cache
->lock
);
2988 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2990 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2991 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2995 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2997 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2998 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2999 struct lttng_metadata_stream
*stream
;
3001 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
3002 wake_up_interruptible(&stream
->read_wait
);
3003 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
3008 * Write the metadata to the metadata cache.
3009 * Must be called with sessions_mutex held.
3010 * The metadata cache lock protects us from concurrent read access from
3011 * thread outputting metadata content to ring buffer.
3012 * The content of the printf is printed as a single atomic metadata
3015 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3016 const char *fmt
, ...)
3022 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3025 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3031 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3032 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3033 session
->priv
->metadata_cache
->cache_alloc
) {
3034 char *tmp_cache_realloc
;
3035 unsigned int tmp_cache_alloc_size
;
3037 tmp_cache_alloc_size
= max_t(unsigned int,
3038 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3039 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3040 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3041 if (!tmp_cache_realloc
)
3043 if (session
->priv
->metadata_cache
->data
) {
3044 memcpy(tmp_cache_realloc
,
3045 session
->priv
->metadata_cache
->data
,
3046 session
->priv
->metadata_cache
->cache_alloc
);
3047 vfree(session
->priv
->metadata_cache
->data
);
3050 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3051 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3053 memcpy(session
->priv
->metadata_cache
->data
+
3054 session
->priv
->metadata_cache
->metadata_written
,
3056 session
->priv
->metadata_cache
->metadata_written
+= len
;
3067 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3071 for (i
= 0; i
< nesting
; i
++) {
3074 ret
= lttng_metadata_printf(session
, " ");
3083 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3084 const struct lttng_kernel_event_field
*field
,
3087 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3091 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3092 const struct lttng_kernel_type_integer
*type
,
3093 enum lttng_kernel_string_encoding parent_encoding
,
3098 ret
= print_tabs(session
, nesting
);
3101 ret
= lttng_metadata_printf(session
,
3102 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3106 (parent_encoding
== lttng_kernel_string_encoding_none
)
3108 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3112 #if __BYTE_ORDER == __BIG_ENDIAN
3113 type
->reverse_byte_order
? " byte_order = le;" : ""
3115 type
->reverse_byte_order
? " byte_order = be;" : ""
3122 * Must be called with sessions_mutex held.
3125 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3126 const struct lttng_kernel_type_struct
*type
,
3129 const char *prev_field_name
= NULL
;
3131 uint32_t i
, nr_fields
;
3132 unsigned int alignment
;
3134 ret
= print_tabs(session
, nesting
);
3137 ret
= lttng_metadata_printf(session
,
3141 nr_fields
= type
->nr_fields
;
3142 for (i
= 0; i
< nr_fields
; i
++) {
3143 const struct lttng_kernel_event_field
*iter_field
;
3145 iter_field
= type
->fields
[i
];
3146 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3150 ret
= print_tabs(session
, nesting
);
3153 alignment
= type
->alignment
;
3155 ret
= lttng_metadata_printf(session
,
3159 ret
= lttng_metadata_printf(session
,
3166 * Must be called with sessions_mutex held.
3169 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3170 const struct lttng_kernel_event_field
*field
,
3175 ret
= _lttng_struct_type_statedump(session
,
3176 lttng_kernel_get_type_struct(field
->type
), nesting
);
3179 return lttng_field_name_statedump(session
, field
, nesting
);
3183 * Must be called with sessions_mutex held.
3186 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3187 const struct lttng_kernel_type_variant
*type
,
3189 const char *prev_field_name
)
3191 const char *tag_name
;
3193 uint32_t i
, nr_choices
;
3195 tag_name
= type
->tag_name
;
3197 tag_name
= prev_field_name
;
3201 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3203 if (type
->alignment
!= 0)
3205 ret
= print_tabs(session
, nesting
);
3208 ret
= lttng_metadata_printf(session
,
3209 "variant <_%s> {\n",
3213 nr_choices
= type
->nr_choices
;
3214 for (i
= 0; i
< nr_choices
; i
++) {
3215 const struct lttng_kernel_event_field
*iter_field
;
3217 iter_field
= type
->choices
[i
];
3218 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3222 ret
= print_tabs(session
, nesting
);
3225 ret
= lttng_metadata_printf(session
,
3231 * Must be called with sessions_mutex held.
3234 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3235 const struct lttng_kernel_event_field
*field
,
3237 const char *prev_field_name
)
3241 ret
= _lttng_variant_type_statedump(session
,
3242 lttng_kernel_get_type_variant(field
->type
), nesting
,
3246 return lttng_field_name_statedump(session
, field
, nesting
);
3250 * Must be called with sessions_mutex held.
3253 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3254 const struct lttng_kernel_event_field
*field
,
3258 const struct lttng_kernel_type_array
*array_type
;
3259 const struct lttng_kernel_type_common
*elem_type
;
3261 array_type
= lttng_kernel_get_type_array(field
->type
);
3262 WARN_ON_ONCE(!array_type
);
3264 if (array_type
->alignment
) {
3265 ret
= print_tabs(session
, nesting
);
3268 ret
= lttng_metadata_printf(session
,
3269 "struct { } align(%u) _%s_padding;\n",
3270 array_type
->alignment
* CHAR_BIT
,
3276 * Nested compound types: Only array of structures and variants are
3277 * currently supported.
3279 elem_type
= array_type
->elem_type
;
3280 switch (elem_type
->type
) {
3281 case lttng_kernel_type_integer
:
3282 case lttng_kernel_type_struct
:
3283 case lttng_kernel_type_variant
:
3284 ret
= _lttng_type_statedump(session
, elem_type
,
3285 array_type
->encoding
, nesting
);
3293 ret
= lttng_metadata_printf(session
,
3296 array_type
->length
);
3301 * Must be called with sessions_mutex held.
3304 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3305 const struct lttng_kernel_event_field
*field
,
3307 const char *prev_field_name
)
3310 const char *length_name
;
3311 const struct lttng_kernel_type_sequence
*sequence_type
;
3312 const struct lttng_kernel_type_common
*elem_type
;
3314 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3315 WARN_ON_ONCE(!sequence_type
);
3317 length_name
= sequence_type
->length_name
;
3319 length_name
= prev_field_name
;
3323 if (sequence_type
->alignment
) {
3324 ret
= print_tabs(session
, nesting
);
3327 ret
= lttng_metadata_printf(session
,
3328 "struct { } align(%u) _%s_padding;\n",
3329 sequence_type
->alignment
* CHAR_BIT
,
3336 * Nested compound types: Only array of structures and variants are
3337 * currently supported.
3339 elem_type
= sequence_type
->elem_type
;
3340 switch (elem_type
->type
) {
3341 case lttng_kernel_type_integer
:
3342 case lttng_kernel_type_struct
:
3343 case lttng_kernel_type_variant
:
3344 ret
= _lttng_type_statedump(session
, elem_type
,
3345 sequence_type
->encoding
, nesting
);
3353 ret
= lttng_metadata_printf(session
,
3361 * Must be called with sessions_mutex held.
3364 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3365 const struct lttng_kernel_type_enum
*type
,
3368 const struct lttng_kernel_enum_desc
*enum_desc
;
3369 const struct lttng_kernel_type_common
*container_type
;
3371 unsigned int i
, nr_entries
;
3373 container_type
= type
->container_type
;
3374 if (container_type
->type
!= lttng_kernel_type_integer
) {
3378 enum_desc
= type
->desc
;
3379 nr_entries
= enum_desc
->nr_entries
;
3381 ret
= print_tabs(session
, nesting
);
3384 ret
= lttng_metadata_printf(session
, "enum : ");
3387 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3388 lttng_kernel_string_encoding_none
, 0);
3391 ret
= lttng_metadata_printf(session
, " {\n");
3394 /* Dump all entries */
3395 for (i
= 0; i
< nr_entries
; i
++) {
3396 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3399 ret
= print_tabs(session
, nesting
+ 1);
3402 ret
= lttng_metadata_printf(session
,
3406 len
= strlen(entry
->string
);
3407 /* Escape the character '"' */
3408 for (j
= 0; j
< len
; j
++) {
3409 char c
= entry
->string
[j
];
3413 ret
= lttng_metadata_printf(session
,
3417 ret
= lttng_metadata_printf(session
,
3421 ret
= lttng_metadata_printf(session
,
3428 ret
= lttng_metadata_printf(session
, "\"");
3432 if (entry
->options
.is_auto
) {
3433 ret
= lttng_metadata_printf(session
, ",\n");
3437 ret
= lttng_metadata_printf(session
,
3441 if (entry
->start
.signedness
)
3442 ret
= lttng_metadata_printf(session
,
3443 "%lld", (long long) entry
->start
.value
);
3445 ret
= lttng_metadata_printf(session
,
3446 "%llu", entry
->start
.value
);
3449 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3451 == entry
->end
.value
) {
3452 ret
= lttng_metadata_printf(session
,
3455 if (entry
->end
.signedness
) {
3456 ret
= lttng_metadata_printf(session
,
3458 (long long) entry
->end
.value
);
3460 ret
= lttng_metadata_printf(session
,
3469 ret
= print_tabs(session
, nesting
);
3472 ret
= lttng_metadata_printf(session
, "}");
3478 * Must be called with sessions_mutex held.
3481 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3482 const struct lttng_kernel_event_field
*field
,
3486 const struct lttng_kernel_type_enum
*enum_type
;
3488 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3489 WARN_ON_ONCE(!enum_type
);
3490 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3493 return lttng_field_name_statedump(session
, field
, nesting
);
3497 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3498 const struct lttng_kernel_event_field
*field
,
3503 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3504 lttng_kernel_string_encoding_none
, nesting
);
3507 return lttng_field_name_statedump(session
, field
, nesting
);
3511 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3512 const struct lttng_kernel_type_string
*type
,
3517 /* Default encoding is UTF8 */
3518 ret
= print_tabs(session
, nesting
);
3521 ret
= lttng_metadata_printf(session
,
3523 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3524 " { encoding = ASCII; }" : "");
3529 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3530 const struct lttng_kernel_event_field
*field
,
3533 const struct lttng_kernel_type_string
*string_type
;
3536 string_type
= lttng_kernel_get_type_string(field
->type
);
3537 WARN_ON_ONCE(!string_type
);
3538 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3541 return lttng_field_name_statedump(session
, field
, nesting
);
3545 * Must be called with sessions_mutex held.
3548 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3549 const struct lttng_kernel_type_common
*type
,
3550 enum lttng_kernel_string_encoding parent_encoding
,
3555 switch (type
->type
) {
3556 case lttng_kernel_type_integer
:
3557 ret
= _lttng_integer_type_statedump(session
,
3558 lttng_kernel_get_type_integer(type
),
3559 parent_encoding
, nesting
);
3561 case lttng_kernel_type_enum
:
3562 ret
= _lttng_enum_type_statedump(session
,
3563 lttng_kernel_get_type_enum(type
),
3566 case lttng_kernel_type_string
:
3567 ret
= _lttng_string_type_statedump(session
,
3568 lttng_kernel_get_type_string(type
),
3571 case lttng_kernel_type_struct
:
3572 ret
= _lttng_struct_type_statedump(session
,
3573 lttng_kernel_get_type_struct(type
),
3576 case lttng_kernel_type_variant
:
3577 ret
= _lttng_variant_type_statedump(session
,
3578 lttng_kernel_get_type_variant(type
),
3582 /* Nested arrays and sequences are not supported yet. */
3583 case lttng_kernel_type_array
:
3584 case lttng_kernel_type_sequence
:
3593 * Must be called with sessions_mutex held.
3596 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3597 const struct lttng_kernel_event_field
*field
,
3599 const char **prev_field_name_p
)
3601 const char *prev_field_name
= NULL
;
3604 if (prev_field_name_p
)
3605 prev_field_name
= *prev_field_name_p
;
3606 switch (field
->type
->type
) {
3607 case lttng_kernel_type_integer
:
3608 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3610 case lttng_kernel_type_enum
:
3611 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3613 case lttng_kernel_type_string
:
3614 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3616 case lttng_kernel_type_struct
:
3617 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3619 case lttng_kernel_type_array
:
3620 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3622 case lttng_kernel_type_sequence
:
3623 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3625 case lttng_kernel_type_variant
:
3626 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3633 if (prev_field_name_p
)
3634 *prev_field_name_p
= field
->name
;
3639 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3640 struct lttng_kernel_ctx
*ctx
)
3642 const char *prev_field_name
= NULL
;
3648 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3649 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3651 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3659 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3660 struct lttng_kernel_event_recorder
*event_recorder
)
3662 const char *prev_field_name
= NULL
;
3663 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3667 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3668 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3670 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3678 * Must be called with sessions_mutex held.
3679 * The entire event metadata is printed as a single atomic metadata
3683 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3684 struct lttng_kernel_channel_buffer
*chan
,
3685 struct lttng_kernel_event_recorder
*event_recorder
)
3689 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3691 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3694 lttng_metadata_begin(session
);
3696 ret
= lttng_metadata_printf(session
,
3700 " stream_id = %u;\n",
3701 event_recorder
->priv
->parent
.desc
->event_name
,
3702 event_recorder
->priv
->id
,
3703 event_recorder
->chan
->priv
->id
);
3707 ret
= lttng_metadata_printf(session
,
3708 " fields := struct {\n"
3713 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3718 * LTTng space reservation can only reserve multiples of the
3721 ret
= lttng_metadata_printf(session
,
3727 event_recorder
->priv
->metadata_dumped
= 1;
3729 lttng_metadata_end(session
);
3735 * Must be called with sessions_mutex held.
3736 * The entire channel metadata is printed as a single atomic metadata
3740 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3741 struct lttng_kernel_channel_buffer
*chan
)
3745 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3748 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3751 lttng_metadata_begin(session
);
3753 WARN_ON_ONCE(!chan
->priv
->header_type
);
3754 ret
= lttng_metadata_printf(session
,
3757 " event.header := %s;\n"
3758 " packet.context := struct packet_context;\n",
3760 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3761 "struct event_header_large");
3765 if (chan
->priv
->ctx
) {
3766 ret
= lttng_metadata_printf(session
,
3767 " event.context := struct {\n");
3771 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3774 if (chan
->priv
->ctx
) {
3775 ret
= lttng_metadata_printf(session
,
3781 ret
= lttng_metadata_printf(session
,
3784 chan
->priv
->metadata_dumped
= 1;
3786 lttng_metadata_end(session
);
3791 * Must be called with sessions_mutex held.
3794 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3796 return lttng_metadata_printf(session
,
3797 "struct packet_context {\n"
3798 " uint64_clock_monotonic_t timestamp_begin;\n"
3799 " uint64_clock_monotonic_t timestamp_end;\n"
3800 " uint64_t content_size;\n"
3801 " uint64_t packet_size;\n"
3802 " uint64_t packet_seq_num;\n"
3803 " unsigned long events_discarded;\n"
3804 " uint32_t cpu_id;\n"
3811 * id: range: 0 - 30.
3812 * id 31 is reserved to indicate an extended header.
3815 * id: range: 0 - 65534.
3816 * id 65535 is reserved to indicate an extended header.
3818 * Must be called with sessions_mutex held.
3821 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3823 return lttng_metadata_printf(session
,
3824 "struct event_header_compact {\n"
3825 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3828 " uint27_clock_monotonic_t timestamp;\n"
3832 " uint64_clock_monotonic_t timestamp;\n"
3837 "struct event_header_large {\n"
3838 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3841 " uint32_clock_monotonic_t timestamp;\n"
3845 " uint64_clock_monotonic_t timestamp;\n"
3849 lttng_alignof(uint32_t) * CHAR_BIT
,
3850 lttng_alignof(uint16_t) * CHAR_BIT
3855 * Approximation of NTP time of day to clock monotonic correlation,
3856 * taken at start of trace.
3857 * Yes, this is only an approximation. Yes, we can (and will) do better
3858 * in future versions.
3859 * This function may return a negative offset. It may happen if the
3860 * system sets the REALTIME clock to 0 after boot.
3862 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3866 int64_t measure_clock_offset(void)
3868 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3869 uint64_t tcf
= trace_clock_freq();
3871 unsigned long flags
;
3872 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3873 struct timespec64 rts
= { 0, 0 };
3875 struct timespec rts
= { 0, 0 };
3878 /* Disable interrupts to increase correlation precision. */
3879 local_irq_save(flags
);
3880 monotonic
[0] = trace_clock_read64();
3881 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3882 ktime_get_real_ts64(&rts
);
3884 getnstimeofday(&rts
);
3886 monotonic
[1] = trace_clock_read64();
3887 local_irq_restore(flags
);
3889 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3890 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3891 if (tcf
== NSEC_PER_SEC
) {
3892 realtime
+= rts
.tv_nsec
;
3894 uint64_t n
= rts
.tv_nsec
* tcf
;
3896 do_div(n
, NSEC_PER_SEC
);
3899 offset
= (int64_t) realtime
- monotonic_avg
;
3904 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3912 while (cur
!= '\0') {
3915 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3919 ret
= lttng_metadata_printf(session
, "%c", '\\');
3922 /* We still print the current char */
3925 ret
= lttng_metadata_printf(session
, "%c", cur
);
3939 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3940 const char *field_value
)
3944 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3948 ret
= print_escaped_ctf_string(session
, field_value
);
3952 ret
= lttng_metadata_printf(session
, "\";\n");
3959 * Output metadata into this session's metadata buffers.
3960 * Must be called with sessions_mutex held.
3963 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3965 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3966 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3967 const char *product_uuid
;
3968 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3969 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3972 if (!LTTNG_READ_ONCE(session
->active
))
3975 lttng_metadata_begin(session
);
3977 if (session
->priv
->metadata_dumped
)
3980 snprintf(uuid_s
, sizeof(uuid_s
),
3981 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3982 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3983 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3984 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3985 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3987 ret
= lttng_metadata_printf(session
,
3988 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3989 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3990 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3991 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3992 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3993 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3994 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4000 " byte_order = %s;\n"
4001 " packet.header := struct {\n"
4002 " uint32_t magic;\n"
4003 " uint8_t uuid[16];\n"
4004 " uint32_t stream_id;\n"
4005 " uint64_t stream_instance_id;\n"
4008 lttng_alignof(uint8_t) * CHAR_BIT
,
4009 lttng_alignof(uint16_t) * CHAR_BIT
,
4010 lttng_alignof(uint32_t) * CHAR_BIT
,
4011 lttng_alignof(uint64_t) * CHAR_BIT
,
4012 sizeof(unsigned long) * CHAR_BIT
,
4013 lttng_alignof(unsigned long) * CHAR_BIT
,
4017 #if __BYTE_ORDER == __BIG_ENDIAN
4026 ret
= lttng_metadata_printf(session
,
4028 " hostname = \"%s\";\n"
4029 " domain = \"kernel\";\n"
4030 " sysname = \"%s\";\n"
4031 " kernel_release = \"%s\";\n"
4032 " kernel_version = \"%s\";\n"
4033 " tracer_name = \"lttng-modules\";\n"
4034 " tracer_major = %d;\n"
4035 " tracer_minor = %d;\n"
4036 " tracer_patchlevel = %d;\n"
4037 " trace_buffering_scheme = \"global\";\n",
4038 current
->nsproxy
->uts_ns
->name
.nodename
,
4042 LTTNG_MODULES_MAJOR_VERSION
,
4043 LTTNG_MODULES_MINOR_VERSION
,
4044 LTTNG_MODULES_PATCHLEVEL_VERSION
4049 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4052 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4053 session
->priv
->creation_time
);
4057 /* Add the product UUID to the 'env' section */
4058 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4060 ret
= lttng_metadata_printf(session
,
4061 " product_uuid = \"%s\";\n",
4068 /* Close the 'env' section */
4069 ret
= lttng_metadata_printf(session
, "};\n\n");
4073 ret
= lttng_metadata_printf(session
,
4075 " name = \"%s\";\n",
4081 if (!trace_clock_uuid(clock_uuid_s
)) {
4082 ret
= lttng_metadata_printf(session
,
4083 " uuid = \"%s\";\n",
4090 ret
= lttng_metadata_printf(session
,
4091 " description = \"%s\";\n"
4092 " freq = %llu; /* Frequency, in Hz */\n"
4093 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4096 trace_clock_description(),
4097 (unsigned long long) trace_clock_freq(),
4098 (long long) measure_clock_offset()
4103 ret
= lttng_metadata_printf(session
,
4104 "typealias integer {\n"
4105 " size = 27; align = 1; signed = false;\n"
4106 " map = clock.%s.value;\n"
4107 "} := uint27_clock_monotonic_t;\n"
4109 "typealias integer {\n"
4110 " size = 32; align = %u; signed = false;\n"
4111 " map = clock.%s.value;\n"
4112 "} := uint32_clock_monotonic_t;\n"
4114 "typealias integer {\n"
4115 " size = 64; align = %u; signed = false;\n"
4116 " map = clock.%s.value;\n"
4117 "} := uint64_clock_monotonic_t;\n\n",
4119 lttng_alignof(uint32_t) * CHAR_BIT
,
4121 lttng_alignof(uint64_t) * CHAR_BIT
,
4127 ret
= _lttng_stream_packet_context_declare(session
);
4131 ret
= _lttng_event_header_declare(session
);
4136 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4137 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4142 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4143 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4144 event_recorder_priv
->pub
);
4148 session
->priv
->metadata_dumped
= 1;
4150 lttng_metadata_end(session
);
4155 * lttng_transport_register - LTT transport registration
4156 * @transport: transport structure
4158 * Registers a transport which can be used as output to extract the data out of
4159 * LTTng. The module calling this registration function must ensure that no
4160 * trap-inducing code will be executed by the transport functions. E.g.
4161 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4162 * is made visible to the transport function. This registration acts as a
4163 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4164 * after its registration must it synchronize the TLBs.
4166 void lttng_transport_register(struct lttng_transport
*transport
)
4169 * Make sure no page fault can be triggered by the module about to be
4170 * registered. We deal with this here so we don't have to call
4171 * vmalloc_sync_mappings() in each module's init.
4173 wrapper_vmalloc_sync_mappings();
4175 mutex_lock(&sessions_mutex
);
4176 list_add_tail(&transport
->node
, <tng_transport_list
);
4177 mutex_unlock(&sessions_mutex
);
4179 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4182 * lttng_transport_unregister - LTT transport unregistration
4183 * @transport: transport structure
4185 void lttng_transport_unregister(struct lttng_transport
*transport
)
4187 mutex_lock(&sessions_mutex
);
4188 list_del(&transport
->node
);
4189 mutex_unlock(&sessions_mutex
);
4191 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4193 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4196 * Make sure no page fault can be triggered by the module about to be
4197 * registered. We deal with this here so we don't have to call
4198 * vmalloc_sync_mappings() in each module's init.
4200 wrapper_vmalloc_sync_mappings();
4202 mutex_lock(&sessions_mutex
);
4203 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4204 mutex_unlock(&sessions_mutex
);
4206 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4208 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4210 mutex_lock(&sessions_mutex
);
4211 list_del(&transport
->node
);
4212 mutex_unlock(&sessions_mutex
);
4214 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4216 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4218 enum cpuhp_state lttng_hp_prepare
;
4219 enum cpuhp_state lttng_hp_online
;
4221 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4223 struct lttng_cpuhp_node
*lttng_node
;
4225 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4226 switch (lttng_node
->component
) {
4227 case LTTNG_RING_BUFFER_FRONTEND
:
4229 case LTTNG_RING_BUFFER_BACKEND
:
4230 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4231 case LTTNG_RING_BUFFER_ITER
:
4233 case LTTNG_CONTEXT_PERF_COUNTERS
:
4240 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4242 struct lttng_cpuhp_node
*lttng_node
;
4244 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4245 switch (lttng_node
->component
) {
4246 case LTTNG_RING_BUFFER_FRONTEND
:
4247 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4248 case LTTNG_RING_BUFFER_BACKEND
:
4250 case LTTNG_RING_BUFFER_ITER
:
4252 case LTTNG_CONTEXT_PERF_COUNTERS
:
4253 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4259 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4261 struct lttng_cpuhp_node
*lttng_node
;
4263 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4264 switch (lttng_node
->component
) {
4265 case LTTNG_RING_BUFFER_FRONTEND
:
4266 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4267 case LTTNG_RING_BUFFER_BACKEND
:
4269 case LTTNG_RING_BUFFER_ITER
:
4270 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4271 case LTTNG_CONTEXT_PERF_COUNTERS
:
4272 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4278 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4280 struct lttng_cpuhp_node
*lttng_node
;
4282 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4283 switch (lttng_node
->component
) {
4284 case LTTNG_RING_BUFFER_FRONTEND
:
4285 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4286 case LTTNG_RING_BUFFER_BACKEND
:
4288 case LTTNG_RING_BUFFER_ITER
:
4290 case LTTNG_CONTEXT_PERF_COUNTERS
:
4297 static int __init
lttng_init_cpu_hotplug(void)
4301 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4302 lttng_hotplug_prepare
,
4303 lttng_hotplug_dead
);
4307 lttng_hp_prepare
= ret
;
4308 lttng_rb_set_hp_prepare(ret
);
4310 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4311 lttng_hotplug_online
,
4312 lttng_hotplug_offline
);
4314 cpuhp_remove_multi_state(lttng_hp_prepare
);
4315 lttng_hp_prepare
= 0;
4318 lttng_hp_online
= ret
;
4319 lttng_rb_set_hp_online(ret
);
4324 static void __exit
lttng_exit_cpu_hotplug(void)
4326 lttng_rb_set_hp_online(0);
4327 cpuhp_remove_multi_state(lttng_hp_online
);
4328 lttng_rb_set_hp_prepare(0);
4329 cpuhp_remove_multi_state(lttng_hp_prepare
);
4332 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4333 static int lttng_init_cpu_hotplug(void)
4337 static void lttng_exit_cpu_hotplug(void)
4340 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4342 static int __init
lttng_events_init(void)
4346 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4349 ret
= wrapper_get_pfnblock_flags_mask_init();
4352 ret
= wrapper_get_pageblock_flags_mask_init();
4355 ret
= lttng_probes_init();
4358 ret
= lttng_context_init();
4361 ret
= lttng_tracepoint_init();
4364 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4365 if (!event_recorder_cache
) {
4367 goto error_kmem_event_recorder
;
4369 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4370 if (!event_recorder_private_cache
) {
4372 goto error_kmem_event_recorder_private
;
4374 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4375 if (!event_notifier_cache
) {
4377 goto error_kmem_event_notifier
;
4379 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4380 if (!event_notifier_private_cache
) {
4382 goto error_kmem_event_notifier_private
;
4384 ret
= lttng_abi_init();
4387 ret
= lttng_logger_init();
4390 ret
= lttng_init_cpu_hotplug();
4393 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4394 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4395 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4396 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4397 LTTNG_MODULES_EXTRAVERSION
,
4399 #ifdef LTTNG_EXTRA_VERSION_GIT
4400 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4404 #ifdef LTTNG_EXTRA_VERSION_NAME
4405 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4409 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4410 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4411 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4415 lttng_logger_exit();
4419 kmem_cache_destroy(event_notifier_private_cache
);
4420 error_kmem_event_notifier_private
:
4421 kmem_cache_destroy(event_notifier_cache
);
4422 error_kmem_event_notifier
:
4423 kmem_cache_destroy(event_recorder_private_cache
);
4424 error_kmem_event_recorder_private
:
4425 kmem_cache_destroy(event_recorder_cache
);
4426 error_kmem_event_recorder
:
4427 lttng_tracepoint_exit();
4429 lttng_context_exit();
4430 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4431 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4432 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4433 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4434 LTTNG_MODULES_EXTRAVERSION
,
4436 #ifdef LTTNG_EXTRA_VERSION_GIT
4437 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4441 #ifdef LTTNG_EXTRA_VERSION_NAME
4442 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4449 module_init(lttng_events_init
);
4451 static void __exit
lttng_events_exit(void)
4453 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4455 lttng_exit_cpu_hotplug();
4456 lttng_logger_exit();
4458 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4459 lttng_session_destroy(session_priv
->pub
);
4460 kmem_cache_destroy(event_recorder_cache
);
4461 kmem_cache_destroy(event_recorder_private_cache
);
4462 kmem_cache_destroy(event_notifier_cache
);
4463 kmem_cache_destroy(event_notifier_private_cache
);
4464 lttng_tracepoint_exit();
4465 lttng_context_exit();
4466 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4467 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4468 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4469 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4470 LTTNG_MODULES_EXTRAVERSION
,
4472 #ifdef LTTNG_EXTRA_VERSION_GIT
4473 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4477 #ifdef LTTNG_EXTRA_VERSION_NAME
4478 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4484 module_exit(lttng_events_exit
);
4486 #include <generated/patches.h>
4487 #ifdef LTTNG_EXTRA_VERSION_GIT
4488 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4490 #ifdef LTTNG_EXTRA_VERSION_NAME
4491 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4493 MODULE_LICENSE("GPL and additional rights");
4494 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4495 MODULE_DESCRIPTION("LTTng tracer");
4496 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4497 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4498 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4499 LTTNG_MODULES_EXTRAVERSION
);