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_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
70 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
74 static int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder
*event
);
75 static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
77 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
78 struct lttng_kernel_channel_buffer
*chan
,
79 struct lttng_kernel_event_recorder
*event
);
81 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
83 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
85 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
86 const struct lttng_kernel_type_common
*type
,
87 enum lttng_kernel_string_encoding parent_encoding
,
90 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
91 const struct lttng_kernel_event_field
*field
,
92 size_t nesting
, const char **prev_field_name_p
);
94 void synchronize_trace(void)
96 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
97 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
103 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
104 #ifdef CONFIG_PREEMPT_RT_FULL
107 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
108 #ifdef CONFIG_PREEMPT_RT
111 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
114 void lttng_lock_sessions(void)
116 mutex_lock(&sessions_mutex
);
119 void lttng_unlock_sessions(void)
121 mutex_unlock(&sessions_mutex
);
124 static struct lttng_transport
*lttng_transport_find(const char *name
)
126 struct lttng_transport
*transport
;
128 list_for_each_entry(transport
, <tng_transport_list
, node
) {
129 if (!strcmp(transport
->name
, name
))
136 * Called with sessions lock held.
138 int lttng_session_active(void)
140 struct lttng_kernel_session_private
*iter
;
142 list_for_each_entry(iter
, &sessions
, list
) {
143 if (iter
->pub
->active
)
149 struct lttng_kernel_session
*lttng_session_create(void)
151 struct lttng_kernel_session
*session
;
152 struct lttng_kernel_session_private
*session_priv
;
153 struct lttng_metadata_cache
*metadata_cache
;
156 mutex_lock(&sessions_mutex
);
157 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
160 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
162 goto err_free_session
;
163 session
->priv
= session_priv
;
164 session_priv
->pub
= session
;
166 INIT_LIST_HEAD(&session_priv
->chan
);
167 INIT_LIST_HEAD(&session_priv
->events
);
168 lttng_guid_gen(&session_priv
->uuid
);
170 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
173 goto err_free_session_private
;
174 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
175 if (!metadata_cache
->data
)
177 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
178 kref_init(&metadata_cache
->refcount
);
179 mutex_init(&metadata_cache
->lock
);
180 session_priv
->metadata_cache
= metadata_cache
;
181 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
182 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
183 sizeof(metadata_cache
->uuid
));
184 INIT_LIST_HEAD(&session_priv
->enablers_head
);
185 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
186 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
187 list_add(&session_priv
->list
, &sessions
);
189 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
190 goto tracker_alloc_error
;
191 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
192 goto tracker_alloc_error
;
193 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
194 goto tracker_alloc_error
;
195 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
196 goto tracker_alloc_error
;
197 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
198 goto tracker_alloc_error
;
199 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
200 goto tracker_alloc_error
;
202 mutex_unlock(&sessions_mutex
);
207 lttng_id_tracker_fini(&session
->pid_tracker
);
208 lttng_id_tracker_fini(&session
->vpid_tracker
);
209 lttng_id_tracker_fini(&session
->uid_tracker
);
210 lttng_id_tracker_fini(&session
->vuid_tracker
);
211 lttng_id_tracker_fini(&session
->gid_tracker
);
212 lttng_id_tracker_fini(&session
->vgid_tracker
);
214 kfree(metadata_cache
);
215 err_free_session_private
:
216 lttng_kvfree(session_priv
);
218 lttng_kvfree(session
);
220 mutex_unlock(&sessions_mutex
);
225 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
227 struct lttng_counter_transport
*transport
;
229 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
230 if (!strcmp(transport
->name
, name
))
236 struct lttng_counter
*lttng_kernel_counter_create(
237 const char *counter_transport_name
,
238 size_t number_dimensions
, const size_t *dimensions_sizes
)
240 struct lttng_counter
*counter
= NULL
;
241 struct lttng_counter_transport
*counter_transport
= NULL
;
243 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
244 if (!counter_transport
) {
245 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
246 counter_transport_name
);
249 if (!try_module_get(counter_transport
->owner
)) {
250 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
254 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
258 /* Create event notifier error counter. */
259 counter
->ops
= &counter_transport
->ops
;
260 counter
->transport
= counter_transport
;
262 counter
->counter
= counter
->ops
->counter_create(
263 number_dimensions
, dimensions_sizes
, 0);
264 if (!counter
->counter
) {
271 lttng_kvfree(counter
);
273 if (counter_transport
)
274 module_put(counter_transport
->owner
);
279 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
281 struct lttng_transport
*transport
= NULL
;
282 struct lttng_event_notifier_group
*event_notifier_group
;
283 const char *transport_name
= "relay-event-notifier";
284 size_t subbuf_size
= 4096; //TODO
285 size_t num_subbuf
= 16; //TODO
286 unsigned int switch_timer_interval
= 0;
287 unsigned int read_timer_interval
= 0;
290 mutex_lock(&sessions_mutex
);
292 transport
= lttng_transport_find(transport_name
);
294 printk(KERN_WARNING
"LTTng: transport %s not found\n",
298 if (!try_module_get(transport
->owner
)) {
299 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
304 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
306 if (!event_notifier_group
)
310 * Initialize the ring buffer used to store event notifier
313 event_notifier_group
->ops
= &transport
->ops
;
314 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
315 transport_name
, event_notifier_group
, NULL
,
316 subbuf_size
, num_subbuf
, switch_timer_interval
,
317 read_timer_interval
);
318 if (!event_notifier_group
->chan
)
321 event_notifier_group
->transport
= transport
;
323 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
324 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
325 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
326 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
328 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
330 mutex_unlock(&sessions_mutex
);
332 return event_notifier_group
;
335 lttng_kvfree(event_notifier_group
);
338 module_put(transport
->owner
);
340 mutex_unlock(&sessions_mutex
);
344 void metadata_cache_destroy(struct kref
*kref
)
346 struct lttng_metadata_cache
*cache
=
347 container_of(kref
, struct lttng_metadata_cache
, refcount
);
352 void lttng_session_destroy(struct lttng_kernel_session
*session
)
354 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
355 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
356 struct lttng_metadata_stream
*metadata_stream
;
357 struct lttng_event_recorder_enabler
*event_recorder_enabler
, *tmp_event_recorder_enabler
;
360 mutex_lock(&sessions_mutex
);
361 WRITE_ONCE(session
->active
, 0);
362 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
363 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
366 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
367 ret
= _lttng_event_recorder_unregister(event_recorder_priv
->pub
);
370 synchronize_trace(); /* Wait for in-flight events to complete */
371 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
372 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
375 list_for_each_entry_safe(event_recorder_enabler
, tmp_event_recorder_enabler
,
376 &session
->priv
->enablers_head
, node
)
377 lttng_event_enabler_destroy(&event_recorder_enabler
->parent
);
378 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, node
)
379 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
380 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
381 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
382 _lttng_channel_destroy(chan_priv
->pub
);
384 mutex_lock(&session
->priv
->metadata_cache
->lock
);
385 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
386 _lttng_metadata_channel_hangup(metadata_stream
);
387 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
388 lttng_id_tracker_fini(&session
->pid_tracker
);
389 lttng_id_tracker_fini(&session
->vpid_tracker
);
390 lttng_id_tracker_fini(&session
->uid_tracker
);
391 lttng_id_tracker_fini(&session
->vuid_tracker
);
392 lttng_id_tracker_fini(&session
->gid_tracker
);
393 lttng_id_tracker_fini(&session
->vgid_tracker
);
394 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
395 list_del(&session
->priv
->list
);
396 mutex_unlock(&sessions_mutex
);
397 lttng_kvfree(session
->priv
);
398 lttng_kvfree(session
);
401 void lttng_event_notifier_group_destroy(
402 struct lttng_event_notifier_group
*event_notifier_group
)
404 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
405 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
408 if (!event_notifier_group
)
411 mutex_lock(&sessions_mutex
);
413 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
416 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
417 &event_notifier_group
->event_notifiers_head
, node
) {
418 ret
= _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
422 /* Wait for in-flight event notifier to complete */
425 irq_work_sync(&event_notifier_group
->wakeup_pending
);
427 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
430 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
431 &event_notifier_group
->enablers_head
, node
)
432 lttng_event_enabler_destroy(&event_notifier_enabler
->parent
);
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
);
583 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
585 struct lttng_kernel_channel_buffer
*chan_buf
;
587 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
589 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
590 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
595 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
599 mutex_lock(&sessions_mutex
);
600 if (is_channel_buffer_metadata(channel
)) {
604 if (channel
->enabled
) {
608 /* Set transient enabler state to "enabled" */
609 channel
->priv
->tstate
= 1;
610 lttng_session_sync_event_enablers(channel
->session
);
611 /* Set atomically the state to "enabled" */
612 WRITE_ONCE(channel
->enabled
, 1);
614 mutex_unlock(&sessions_mutex
);
618 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
622 mutex_lock(&sessions_mutex
);
623 if (is_channel_buffer_metadata(channel
)) {
627 if (!channel
->enabled
) {
631 /* Set atomically the state to "disabled" */
632 WRITE_ONCE(channel
->enabled
, 0);
633 /* Set transient enabler state to "enabled" */
634 channel
->priv
->tstate
= 0;
635 lttng_session_sync_event_enablers(channel
->session
);
637 mutex_unlock(&sessions_mutex
);
641 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
645 mutex_lock(&sessions_mutex
);
646 switch (event
->type
) {
647 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
649 struct lttng_kernel_event_recorder
*event_recorder
=
650 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
652 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
658 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
659 switch (event
->priv
->instrumentation
) {
660 case LTTNG_KERNEL_ABI_KRETPROBE
:
671 if (event
->enabled
) {
675 switch (event
->priv
->instrumentation
) {
676 case LTTNG_KERNEL_ABI_TRACEPOINT
:
678 case LTTNG_KERNEL_ABI_SYSCALL
:
682 case LTTNG_KERNEL_ABI_KPROBE
:
684 case LTTNG_KERNEL_ABI_UPROBE
:
685 WRITE_ONCE(event
->enabled
, 1);
688 case LTTNG_KERNEL_ABI_KRETPROBE
:
689 ret
= lttng_kretprobes_event_enable_state(event
, 1);
692 case LTTNG_KERNEL_ABI_FUNCTION
:
694 case LTTNG_KERNEL_ABI_NOOP
:
701 mutex_unlock(&sessions_mutex
);
705 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
709 mutex_lock(&sessions_mutex
);
710 switch (event
->type
) {
711 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
713 struct lttng_kernel_event_recorder
*event_recorder
=
714 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
716 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
722 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
723 switch (event
->priv
->instrumentation
) {
724 case LTTNG_KERNEL_ABI_KRETPROBE
:
735 if (!event
->enabled
) {
739 switch (event
->priv
->instrumentation
) {
740 case LTTNG_KERNEL_ABI_TRACEPOINT
:
742 case LTTNG_KERNEL_ABI_SYSCALL
:
746 case LTTNG_KERNEL_ABI_KPROBE
:
748 case LTTNG_KERNEL_ABI_UPROBE
:
749 WRITE_ONCE(event
->enabled
, 0);
752 case LTTNG_KERNEL_ABI_KRETPROBE
:
753 ret
= lttng_kretprobes_event_enable_state(event
, 0);
756 case LTTNG_KERNEL_ABI_FUNCTION
:
758 case LTTNG_KERNEL_ABI_NOOP
:
765 mutex_unlock(&sessions_mutex
);
769 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
770 const char *transport_name
,
772 size_t subbuf_size
, size_t num_subbuf
,
773 unsigned int switch_timer_interval
,
774 unsigned int read_timer_interval
,
775 enum channel_type channel_type
)
777 struct lttng_kernel_channel_buffer
*chan
;
778 struct lttng_kernel_channel_buffer_private
*chan_priv
;
779 struct lttng_transport
*transport
= NULL
;
781 mutex_lock(&sessions_mutex
);
782 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
783 goto active
; /* Refuse to add channel to active session */
784 transport
= lttng_transport_find(transport_name
);
786 printk(KERN_WARNING
"LTTng: transport %s not found\n",
790 if (!try_module_get(transport
->owner
)) {
791 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
794 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
797 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
800 chan
->priv
= chan_priv
;
801 chan_priv
->pub
= chan
;
802 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
803 chan
->parent
.session
= session
;
804 chan
->priv
->id
= session
->priv
->free_chan_id
++;
805 chan
->ops
= &transport
->ops
;
807 * Note: the channel creation op already writes into the packet
808 * headers. Therefore the "chan" information used as input
809 * should be already accessible.
811 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
812 chan
, buf_addr
, subbuf_size
, num_subbuf
,
813 switch_timer_interval
, read_timer_interval
);
814 if (!chan
->priv
->rb_chan
)
816 chan
->priv
->parent
.tstate
= 1;
817 chan
->parent
.enabled
= 1;
818 chan
->priv
->transport
= transport
;
819 chan
->priv
->channel_type
= channel_type
;
820 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
821 mutex_unlock(&sessions_mutex
);
830 module_put(transport
->owner
);
833 mutex_unlock(&sessions_mutex
);
838 * Only used internally at session destruction for per-cpu channels, and
839 * when metadata channel is released.
840 * Needs to be called with sessions mutex held.
843 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
845 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
846 module_put(chan
->priv
->transport
->owner
);
847 list_del(&chan
->priv
->node
);
848 lttng_kernel_destroy_context(chan
->priv
->ctx
);
853 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
855 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
857 /* Protect the metadata cache with the sessions_mutex. */
858 mutex_lock(&sessions_mutex
);
859 _lttng_channel_destroy(chan
);
860 mutex_unlock(&sessions_mutex
);
862 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
865 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
867 stream
->finalized
= 1;
868 wake_up_interruptible(&stream
->read_wait
);
873 * Supports event creation while tracing session is active.
874 * Needs to be called with sessions mutex held.
876 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
877 const struct lttng_kernel_event_desc
*event_desc
)
879 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
880 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
881 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
882 struct lttng_kernel_session
*session
= chan
->parent
.session
;
883 struct lttng_kernel_event_recorder
*event_recorder
;
884 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
885 const char *event_name
;
886 struct hlist_head
*head
;
889 if (chan
->priv
->free_event_id
== -1U) {
895 case LTTNG_KERNEL_ABI_TRACEPOINT
:
896 event_name
= event_desc
->event_name
;
899 case LTTNG_KERNEL_ABI_KPROBE
:
901 case LTTNG_KERNEL_ABI_UPROBE
:
903 case LTTNG_KERNEL_ABI_KRETPROBE
:
905 case LTTNG_KERNEL_ABI_SYSCALL
:
906 event_name
= event_param
->name
;
909 case LTTNG_KERNEL_ABI_FUNCTION
:
911 case LTTNG_KERNEL_ABI_NOOP
:
919 head
= utils_borrow_hash_table_bucket(session
->priv
->events_ht
.table
,
920 LTTNG_EVENT_HT_SIZE
, event_name
);
921 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
922 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
923 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
924 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
925 && chan
== event_recorder_priv
->pub
->chan
) {
931 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
932 if (!event_recorder
) {
936 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
937 if (!event_recorder_priv
) {
939 goto cache_private_error
;
941 event_recorder_priv
->pub
= event_recorder
;
942 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
943 event_recorder
->priv
= event_recorder_priv
;
944 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
945 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
947 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
948 event_recorder
->chan
= chan
;
949 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
950 event_recorder
->priv
->parent
.instrumentation
= itype
;
951 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
952 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
955 case LTTNG_KERNEL_ABI_TRACEPOINT
:
956 /* Event will be enabled by enabler sync. */
957 event_recorder
->parent
.enabled
= 0;
958 event_recorder
->priv
->parent
.registered
= 0;
959 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
960 if (!event_recorder
->priv
->parent
.desc
) {
964 /* Populate lttng_event structure before event registration. */
968 case LTTNG_KERNEL_ABI_KPROBE
:
970 * Needs to be explicitly enabled after creation, since
971 * we may want to apply filters.
973 event_recorder
->parent
.enabled
= 0;
974 event_recorder
->priv
->parent
.registered
= 1;
976 * Populate lttng_event structure before event
980 ret
= lttng_kprobes_register_event(event_name
,
981 event_param
->u
.kprobe
.symbol_name
,
982 event_param
->u
.kprobe
.offset
,
983 event_param
->u
.kprobe
.addr
,
989 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
993 case LTTNG_KERNEL_ABI_KRETPROBE
:
995 struct lttng_kernel_event_recorder
*event_recorder_return
;
996 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
998 /* kretprobe defines 2 events */
1000 * Needs to be explicitly enabled after creation, since
1001 * we may want to apply filters.
1003 event_recorder
->parent
.enabled
= 0;
1004 event_recorder
->priv
->parent
.registered
= 1;
1006 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
1007 if (!event_recorder_return
) {
1009 goto register_error
;
1011 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
1012 if (!event_recorder_return_priv
) {
1013 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1015 goto register_error
;
1017 event_recorder_return_priv
->pub
= event_recorder_return
;
1018 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
1019 event_recorder_return
->priv
= event_recorder_return_priv
;
1020 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
1021 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
1023 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1024 event_recorder_return
->chan
= chan
;
1025 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
1026 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
1027 event_recorder_return
->parent
.enabled
= 0;
1028 event_recorder_return
->priv
->parent
.registered
= 1;
1029 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1030 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1032 * Populate lttng_event structure before kretprobe registration.
1035 ret
= lttng_kretprobes_register(event_name
,
1036 event_param
->u
.kretprobe
.symbol_name
,
1037 event_param
->u
.kretprobe
.offset
,
1038 event_param
->u
.kretprobe
.addr
,
1039 event_recorder
, event_recorder_return
);
1041 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1042 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1044 goto register_error
;
1046 /* Take 2 refs on the module: one per event. */
1047 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1049 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1051 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1052 event_recorder_return
);
1053 WARN_ON_ONCE(ret
> 0);
1055 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1056 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1057 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1058 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1059 goto statedump_error
;
1061 list_add(&event_recorder_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1065 case LTTNG_KERNEL_ABI_SYSCALL
:
1067 * Needs to be explicitly enabled after creation, since
1068 * we may want to apply filters.
1070 event_recorder
->parent
.enabled
= 0;
1071 event_recorder
->priv
->parent
.registered
= 0;
1072 event_recorder
->priv
->parent
.desc
= event_desc
;
1073 switch (event_param
->u
.syscall
.entryexit
) {
1074 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1076 goto register_error
;
1077 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1078 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1080 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1081 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1084 switch (event_param
->u
.syscall
.abi
) {
1085 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1087 goto register_error
;
1088 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1089 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1091 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1092 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1095 if (!event_recorder
->priv
->parent
.desc
) {
1097 goto register_error
;
1101 case LTTNG_KERNEL_ABI_UPROBE
:
1103 * Needs to be explicitly enabled after creation, since
1104 * we may want to apply filters.
1106 event_recorder
->parent
.enabled
= 0;
1107 event_recorder
->priv
->parent
.registered
= 1;
1110 * Populate lttng_event structure before event
1115 ret
= lttng_uprobes_register_event(event_param
->name
,
1116 event_param
->u
.uprobe
.fd
,
1119 goto register_error
;
1120 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1124 case LTTNG_KERNEL_ABI_FUNCTION
:
1126 case LTTNG_KERNEL_ABI_NOOP
:
1131 goto register_error
;
1133 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1134 WARN_ON_ONCE(ret
> 0);
1136 goto statedump_error
;
1138 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1139 list_add(&event_recorder
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1140 return event_recorder
;
1143 /* If a statedump error occurs, events will not be readable. */
1145 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1146 cache_private_error
:
1147 kmem_cache_free(event_recorder_cache
, event_recorder
);
1152 return ERR_PTR(ret
);
1155 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1156 const struct lttng_kernel_event_desc
*event_desc
,
1157 uint64_t token
, uint64_t error_counter_index
,
1158 struct lttng_event_notifier_group
*event_notifier_group
,
1159 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1160 enum lttng_kernel_abi_instrumentation itype
)
1162 struct lttng_kernel_event_notifier
*event_notifier
;
1163 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1164 struct lttng_counter
*error_counter
;
1165 const char *event_name
;
1166 struct hlist_head
*head
;
1170 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1171 event_name
= event_desc
->event_name
;
1174 case LTTNG_KERNEL_ABI_KPROBE
:
1176 case LTTNG_KERNEL_ABI_UPROBE
:
1178 case LTTNG_KERNEL_ABI_SYSCALL
:
1179 event_name
= event_notifier_param
->event
.name
;
1182 case LTTNG_KERNEL_ABI_KRETPROBE
:
1184 case LTTNG_KERNEL_ABI_FUNCTION
:
1186 case LTTNG_KERNEL_ABI_NOOP
:
1194 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1195 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1196 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1197 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1198 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1199 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1200 && event_notifier_group
== event_notifier_priv
->group
1201 && token
== event_notifier_priv
->parent
.user_token
) {
1207 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1208 if (!event_notifier
) {
1212 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1213 if (!event_notifier_priv
) {
1215 goto cache_private_error
;
1217 event_notifier_priv
->pub
= event_notifier
;
1218 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1219 event_notifier
->priv
= event_notifier_priv
;
1220 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1221 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1223 event_notifier
->priv
->group
= event_notifier_group
;
1224 event_notifier
->priv
->parent
.user_token
= token
;
1225 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1226 event_notifier
->priv
->num_captures
= 0;
1227 event_notifier
->priv
->parent
.instrumentation
= itype
;
1228 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1229 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1230 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1231 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1232 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1235 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1236 /* Event will be enabled by enabler sync. */
1237 event_notifier
->parent
.enabled
= 0;
1238 event_notifier
->priv
->parent
.registered
= 0;
1239 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1240 if (!event_notifier
->priv
->parent
.desc
) {
1242 goto register_error
;
1244 /* Populate lttng_event_notifier structure before event registration. */
1248 case LTTNG_KERNEL_ABI_KPROBE
:
1250 * Needs to be explicitly enabled after creation, since
1251 * we may want to apply filters.
1253 event_notifier
->parent
.enabled
= 0;
1254 event_notifier
->priv
->parent
.registered
= 1;
1256 * Populate lttng_event_notifier structure before event
1260 ret
= lttng_kprobes_register_event_notifier(
1261 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1262 event_notifier_param
->event
.u
.kprobe
.offset
,
1263 event_notifier_param
->event
.u
.kprobe
.addr
,
1267 goto register_error
;
1269 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1273 case LTTNG_KERNEL_ABI_SYSCALL
:
1275 * Needs to be explicitly enabled after creation, since
1276 * we may want to apply filters.
1278 event_notifier
->parent
.enabled
= 0;
1279 event_notifier
->priv
->parent
.registered
= 0;
1280 event_notifier
->priv
->parent
.desc
= event_desc
;
1281 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1282 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1284 goto register_error
;
1285 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1286 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1288 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1289 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1292 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1293 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1295 goto register_error
;
1296 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1297 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1299 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1300 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1304 if (!event_notifier
->priv
->parent
.desc
) {
1306 goto register_error
;
1310 case LTTNG_KERNEL_ABI_UPROBE
:
1312 * Needs to be explicitly enabled after creation, since
1313 * we may want to apply filters.
1315 event_notifier
->parent
.enabled
= 0;
1316 event_notifier
->priv
->parent
.registered
= 1;
1319 * Populate lttng_event_notifier structure before
1320 * event_notifier registration.
1324 ret
= lttng_uprobes_register_event_notifier(
1325 event_notifier_param
->event
.name
,
1326 event_notifier_param
->event
.u
.uprobe
.fd
,
1329 goto register_error
;
1330 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1334 case LTTNG_KERNEL_ABI_KRETPROBE
:
1336 case LTTNG_KERNEL_ABI_FUNCTION
:
1338 case LTTNG_KERNEL_ABI_NOOP
:
1343 goto register_error
;
1346 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1347 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1350 * Clear the error counter bucket. The sessiond keeps track of which
1351 * bucket is currently in use. We trust it. The session lock
1352 * synchronizes against concurrent creation of the error
1355 error_counter
= event_notifier_group
->error_counter
;
1356 if (error_counter
) {
1357 size_t dimension_index
[1];
1360 * Check that the index is within the boundary of the counter.
1362 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1363 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1364 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1366 goto register_error
;
1369 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1370 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1372 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1373 event_notifier
->priv
->error_counter_index
);
1374 goto register_error
;
1378 return event_notifier
;
1381 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1382 cache_private_error
:
1383 kmem_cache_free(event_notifier_cache
, event_notifier
);
1387 return ERR_PTR(ret
);
1390 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1391 const size_t *dim_indexes
, int32_t cpu
,
1392 int64_t *val
, bool *overflow
, bool *underflow
)
1394 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1395 cpu
, val
, overflow
, underflow
);
1398 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1399 const size_t *dim_indexes
, int64_t *val
,
1400 bool *overflow
, bool *underflow
)
1402 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1403 val
, overflow
, underflow
);
1406 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1407 const size_t *dim_indexes
)
1409 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1412 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
1413 const struct lttng_kernel_event_desc
*event_desc
)
1415 struct lttng_kernel_event_recorder
*event
;
1417 mutex_lock(&sessions_mutex
);
1418 event
= _lttng_kernel_event_recorder_create(event_enabler
, event_desc
);
1419 mutex_unlock(&sessions_mutex
);
1423 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1424 const struct lttng_kernel_event_desc
*event_desc
,
1425 uint64_t id
, uint64_t error_counter_index
,
1426 struct lttng_event_notifier_group
*event_notifier_group
,
1427 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1428 enum lttng_kernel_abi_instrumentation itype
)
1430 struct lttng_kernel_event_notifier
*event_notifier
;
1432 mutex_lock(&sessions_mutex
);
1433 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1434 error_counter_index
, event_notifier_group
,
1435 event_notifier_param
, itype
);
1436 mutex_unlock(&sessions_mutex
);
1437 return event_notifier
;
1440 /* Only used for tracepoints for now. */
1442 void register_event_recorder(struct lttng_kernel_event_recorder
*event_recorder
)
1444 const struct lttng_kernel_event_desc
*desc
;
1447 if (event_recorder
->priv
->parent
.registered
)
1450 desc
= event_recorder
->priv
->parent
.desc
;
1451 switch (event_recorder
->priv
->parent
.instrumentation
) {
1452 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1453 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1454 desc
->tp_class
->probe_callback
,
1455 &event_recorder
->parent
);
1458 case LTTNG_KERNEL_ABI_SYSCALL
:
1459 ret
= lttng_syscall_filter_enable_event(&event_recorder
->parent
);
1462 case LTTNG_KERNEL_ABI_KPROBE
:
1464 case LTTNG_KERNEL_ABI_UPROBE
:
1466 case LTTNG_KERNEL_ABI_KRETPROBE
:
1470 case LTTNG_KERNEL_ABI_FUNCTION
:
1472 case LTTNG_KERNEL_ABI_NOOP
:
1478 event_recorder
->priv
->parent
.registered
= 1;
1482 * Only used internally at session destruction.
1484 int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1486 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1487 const struct lttng_kernel_event_desc
*desc
;
1490 if (!event_priv
->registered
)
1493 desc
= event_priv
->desc
;
1494 switch (event_priv
->instrumentation
) {
1495 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1496 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1497 event_priv
->desc
->tp_class
->probe_callback
,
1498 &event_recorder
->parent
);
1501 case LTTNG_KERNEL_ABI_KPROBE
:
1502 lttng_kprobes_unregister_event(event_recorder
);
1506 case LTTNG_KERNEL_ABI_KRETPROBE
:
1507 lttng_kretprobes_unregister(event_recorder
);
1511 case LTTNG_KERNEL_ABI_SYSCALL
:
1512 ret
= lttng_syscall_filter_disable_event(&event_recorder
->parent
);
1515 case LTTNG_KERNEL_ABI_NOOP
:
1519 case LTTNG_KERNEL_ABI_UPROBE
:
1520 lttng_uprobes_unregister_event(event_recorder
);
1524 case LTTNG_KERNEL_ABI_FUNCTION
:
1530 event_priv
->registered
= 0;
1534 /* Only used for tracepoints for now. */
1536 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1538 const struct lttng_kernel_event_desc
*desc
;
1541 if (event_notifier
->priv
->parent
.registered
)
1544 desc
= event_notifier
->priv
->parent
.desc
;
1545 switch (event_notifier
->priv
->parent
.instrumentation
) {
1546 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1547 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1548 desc
->tp_class
->probe_callback
,
1549 &event_notifier
->parent
);
1552 case LTTNG_KERNEL_ABI_SYSCALL
:
1553 ret
= lttng_syscall_filter_enable_event(&event_notifier
->parent
);
1556 case LTTNG_KERNEL_ABI_KPROBE
:
1558 case LTTNG_KERNEL_ABI_UPROBE
:
1562 case LTTNG_KERNEL_ABI_KRETPROBE
:
1564 case LTTNG_KERNEL_ABI_FUNCTION
:
1566 case LTTNG_KERNEL_ABI_NOOP
:
1572 event_notifier
->priv
->parent
.registered
= 1;
1576 int _lttng_event_notifier_unregister(
1577 struct lttng_kernel_event_notifier
*event_notifier
)
1579 const struct lttng_kernel_event_desc
*desc
;
1582 if (!event_notifier
->priv
->parent
.registered
)
1585 desc
= event_notifier
->priv
->parent
.desc
;
1586 switch (event_notifier
->priv
->parent
.instrumentation
) {
1587 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1588 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1589 event_notifier
->priv
->parent
.desc
->tp_class
->probe_callback
,
1590 &event_notifier
->parent
);
1593 case LTTNG_KERNEL_ABI_KPROBE
:
1594 lttng_kprobes_unregister_event_notifier(event_notifier
);
1598 case LTTNG_KERNEL_ABI_UPROBE
:
1599 lttng_uprobes_unregister_event_notifier(event_notifier
);
1603 case LTTNG_KERNEL_ABI_SYSCALL
:
1604 ret
= lttng_syscall_filter_disable_event(&event_notifier
->parent
);
1607 case LTTNG_KERNEL_ABI_KRETPROBE
:
1609 case LTTNG_KERNEL_ABI_FUNCTION
:
1611 case LTTNG_KERNEL_ABI_NOOP
:
1617 event_notifier
->priv
->parent
.registered
= 0;
1622 * Only used internally at session destruction.
1625 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1627 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1628 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1630 lttng_free_event_filter_runtime(event
);
1631 /* Free event enabler refs */
1632 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1633 &event_priv
->enablers_ref_head
, node
)
1636 switch (event
->type
) {
1637 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1639 struct lttng_kernel_event_recorder
*event_recorder
=
1640 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1642 switch (event_priv
->instrumentation
) {
1643 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1644 lttng_event_desc_put(event_priv
->desc
);
1647 case LTTNG_KERNEL_ABI_KPROBE
:
1648 module_put(event_priv
->desc
->owner
);
1649 lttng_kprobes_destroy_event_private(event_recorder
);
1652 case LTTNG_KERNEL_ABI_KRETPROBE
:
1653 module_put(event_priv
->desc
->owner
);
1654 lttng_kretprobes_destroy_private(event_recorder
);
1657 case LTTNG_KERNEL_ABI_SYSCALL
:
1660 case LTTNG_KERNEL_ABI_UPROBE
:
1661 module_put(event_priv
->desc
->owner
);
1662 lttng_uprobes_destroy_event_private(event_recorder
);
1665 case LTTNG_KERNEL_ABI_FUNCTION
:
1667 case LTTNG_KERNEL_ABI_NOOP
:
1672 list_del(&event_recorder
->priv
->node
);
1673 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1674 kmem_cache_free(event_recorder_cache
, event_recorder
);
1677 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1679 struct lttng_kernel_event_notifier
*event_notifier
=
1680 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1682 switch (event_notifier
->priv
->parent
.instrumentation
) {
1683 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1684 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1687 case LTTNG_KERNEL_ABI_KPROBE
:
1688 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1689 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1692 case LTTNG_KERNEL_ABI_SYSCALL
:
1695 case LTTNG_KERNEL_ABI_UPROBE
:
1696 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1697 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1700 case LTTNG_KERNEL_ABI_KRETPROBE
:
1702 case LTTNG_KERNEL_ABI_FUNCTION
:
1704 case LTTNG_KERNEL_ABI_NOOP
:
1709 list_del(&event_notifier
->priv
->node
);
1710 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1711 kmem_cache_free(event_notifier_cache
, event_notifier
);
1719 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1720 enum tracker_type tracker_type
)
1722 switch (tracker_type
) {
1724 return &session
->pid_tracker
;
1726 return &session
->vpid_tracker
;
1728 return &session
->uid_tracker
;
1730 return &session
->vuid_tracker
;
1732 return &session
->gid_tracker
;
1734 return &session
->vgid_tracker
;
1741 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1742 enum tracker_type tracker_type
, int id
)
1744 struct lttng_kernel_id_tracker
*tracker
;
1747 tracker
= get_tracker(session
, tracker_type
);
1752 mutex_lock(&sessions_mutex
);
1754 /* track all ids: destroy tracker. */
1755 lttng_id_tracker_destroy(tracker
, true);
1758 ret
= lttng_id_tracker_add(tracker
, id
);
1760 mutex_unlock(&sessions_mutex
);
1764 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1765 enum tracker_type tracker_type
, int id
)
1767 struct lttng_kernel_id_tracker
*tracker
;
1770 tracker
= get_tracker(session
, tracker_type
);
1775 mutex_lock(&sessions_mutex
);
1777 /* untrack all ids: replace by empty tracker. */
1778 ret
= lttng_id_tracker_empty_set(tracker
);
1780 ret
= lttng_id_tracker_del(tracker
, id
);
1782 mutex_unlock(&sessions_mutex
);
1787 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1789 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1790 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1791 struct lttng_id_hash_node
*e
;
1794 mutex_lock(&sessions_mutex
);
1796 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1797 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1799 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1805 /* ID tracker disabled. */
1806 if (iter
>= *pos
&& iter
== 0) {
1807 return id_tracker_p
; /* empty tracker */
1815 /* Called with sessions_mutex held. */
1817 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1819 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1820 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1821 struct lttng_id_hash_node
*e
;
1826 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1827 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1829 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1830 if (iter
++ >= *ppos
)
1835 /* ID tracker disabled. */
1836 if (iter
>= *ppos
&& iter
== 0)
1837 return p
; /* empty tracker */
1846 void id_list_stop(struct seq_file
*m
, void *p
)
1848 mutex_unlock(&sessions_mutex
);
1852 int id_list_show(struct seq_file
*m
, void *p
)
1854 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1855 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1858 if (p
== id_tracker_p
) {
1859 /* Tracker disabled. */
1862 const struct lttng_id_hash_node
*e
= p
;
1864 id
= lttng_id_tracker_get_node_id(e
);
1866 switch (id_tracker
->priv
->tracker_type
) {
1868 seq_printf(m
, "process { pid = %d; };\n", id
);
1871 seq_printf(m
, "process { vpid = %d; };\n", id
);
1874 seq_printf(m
, "user { uid = %d; };\n", id
);
1877 seq_printf(m
, "user { vuid = %d; };\n", id
);
1880 seq_printf(m
, "group { gid = %d; };\n", id
);
1883 seq_printf(m
, "group { vgid = %d; };\n", id
);
1886 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1892 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1893 .start
= id_list_start
,
1894 .next
= id_list_next
,
1895 .stop
= id_list_stop
,
1896 .show
= id_list_show
,
1900 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1902 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1906 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1908 struct seq_file
*m
= file
->private_data
;
1909 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1912 WARN_ON_ONCE(!id_tracker
);
1913 ret
= seq_release(inode
, file
);
1915 fput(id_tracker
->priv
->session
->priv
->file
);
1919 const struct file_operations lttng_tracker_ids_list_fops
= {
1920 .owner
= THIS_MODULE
,
1921 .open
= lttng_tracker_ids_list_open
,
1923 .llseek
= seq_lseek
,
1924 .release
= lttng_tracker_ids_list_release
,
1927 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1928 enum tracker_type tracker_type
)
1930 struct file
*tracker_ids_list_file
;
1934 file_fd
= lttng_get_unused_fd();
1940 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1941 <tng_tracker_ids_list_fops
,
1943 if (IS_ERR(tracker_ids_list_file
)) {
1944 ret
= PTR_ERR(tracker_ids_list_file
);
1947 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1949 goto refcount_error
;
1951 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1954 m
= tracker_ids_list_file
->private_data
;
1956 m
->private = get_tracker(session
, tracker_type
);
1957 BUG_ON(!m
->private);
1958 fd_install(file_fd
, tracker_ids_list_file
);
1963 atomic_long_dec(&session
->priv
->file
->f_count
);
1965 fput(tracker_ids_list_file
);
1967 put_unused_fd(file_fd
);
1973 * Enabler management.
1976 int lttng_match_enabler_star_glob(const char *desc_name
,
1977 const char *pattern
)
1979 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1980 desc_name
, LTTNG_SIZE_MAX
))
1986 int lttng_match_enabler_name(const char *desc_name
,
1989 if (strcmp(desc_name
, name
))
1994 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1995 struct lttng_event_enabler_common
*enabler
)
1997 const char *desc_name
, *enabler_name
;
1998 bool compat
= false, entry
= false;
2000 enabler_name
= enabler
->event_param
.name
;
2001 switch (enabler
->event_param
.instrumentation
) {
2002 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2003 desc_name
= desc
->event_name
;
2004 switch (enabler
->format_type
) {
2005 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2006 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2007 case LTTNG_ENABLER_FORMAT_NAME
:
2008 return lttng_match_enabler_name(desc_name
, enabler_name
);
2014 case LTTNG_KERNEL_ABI_SYSCALL
:
2015 desc_name
= desc
->event_name
;
2016 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2017 desc_name
+= strlen("compat_");
2020 if (!strncmp(desc_name
, "syscall_exit_",
2021 strlen("syscall_exit_"))) {
2022 desc_name
+= strlen("syscall_exit_");
2023 } else if (!strncmp(desc_name
, "syscall_entry_",
2024 strlen("syscall_entry_"))) {
2025 desc_name
+= strlen("syscall_entry_");
2031 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2032 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2034 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2038 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2045 switch (enabler
->event_param
.u
.syscall
.abi
) {
2046 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2048 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2059 switch (enabler
->event_param
.u
.syscall
.match
) {
2060 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2061 switch (enabler
->format_type
) {
2062 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2063 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2064 case LTTNG_ENABLER_FORMAT_NAME
:
2065 return lttng_match_enabler_name(desc_name
, enabler_name
);
2070 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2071 return -EINVAL
; /* Not implemented. */
2084 int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler
*event_enabler
,
2085 struct lttng_kernel_event_recorder
*event_recorder
)
2087 struct lttng_event_enabler_common
*base_enabler
= lttng_event_recorder_enabler_as_enabler(
2090 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2092 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2093 && event_recorder
->chan
== event_enabler
->chan
)
2100 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2101 struct lttng_kernel_event_notifier
*event_notifier
)
2103 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2104 event_notifier_enabler
);
2106 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2108 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2109 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2110 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->parent
.user_token
)
2117 struct lttng_enabler_ref
*lttng_enabler_ref(
2118 struct list_head
*enablers_ref_list
,
2119 struct lttng_event_enabler_common
*enabler
)
2121 struct lttng_enabler_ref
*enabler_ref
;
2123 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2124 if (enabler_ref
->ref
== enabler
)
2131 void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2133 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2134 struct lttng_kernel_probe_desc
*probe_desc
;
2135 const struct lttng_kernel_event_desc
*desc
;
2137 struct list_head
*probe_list
;
2139 probe_list
= lttng_get_probe_list_head();
2141 * For each probe event, if we find that a probe event matches
2142 * our enabler, create an associated lttng_event if not
2145 list_for_each_entry(probe_desc
, probe_list
, head
) {
2146 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2148 struct hlist_head
*head
;
2149 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2150 struct lttng_kernel_event_recorder
*event_recorder
;
2152 desc
= probe_desc
->event_desc
[i
];
2153 if (!lttng_desc_match_enabler(desc
,
2154 lttng_event_recorder_enabler_as_enabler(event_enabler
)))
2158 * Check if already created.
2160 head
= utils_borrow_hash_table_bucket(
2161 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2163 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2164 if (event_recorder_private
->parent
.desc
== desc
2165 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2172 * We need to create an event for this
2175 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
2176 if (!event_recorder
) {
2177 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2178 probe_desc
->event_desc
[i
]->event_name
);
2185 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2187 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2188 struct lttng_kernel_probe_desc
*probe_desc
;
2189 const struct lttng_kernel_event_desc
*desc
;
2191 struct list_head
*probe_list
;
2193 probe_list
= lttng_get_probe_list_head();
2195 * For each probe event, if we find that a probe event matches
2196 * our enabler, create an associated lttng_event_notifier if not
2199 list_for_each_entry(probe_desc
, probe_list
, head
) {
2200 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2202 struct hlist_head
*head
;
2203 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2204 struct lttng_kernel_event_notifier
*event_notifier
;
2206 desc
= probe_desc
->event_desc
[i
];
2207 if (!lttng_desc_match_enabler(desc
,
2208 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2212 * Check if already created.
2214 head
= utils_borrow_hash_table_bucket(
2215 event_notifier_group
->event_notifiers_ht
.table
,
2216 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2217 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2218 if (event_notifier_priv
->parent
.desc
== desc
2219 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->parent
.user_token
)
2226 * We need to create a event_notifier for this event probe.
2228 event_notifier
= _lttng_event_notifier_create(desc
,
2229 event_notifier_enabler
->parent
.user_token
,
2230 event_notifier_enabler
->error_counter_index
,
2231 event_notifier_group
, NULL
,
2232 LTTNG_KERNEL_ABI_TRACEPOINT
);
2233 if (IS_ERR(event_notifier
)) {
2234 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2235 probe_desc
->event_desc
[i
]->event_name
);
2242 void lttng_create_syscall_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2246 ret
= lttng_syscalls_register_event_recorder(event_enabler
);
2251 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2255 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2257 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2262 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2263 * tracepoint probes.
2264 * Should be called with sessions mutex held.
2267 void lttng_create_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2269 switch (event_enabler
->parent
.event_param
.instrumentation
) {
2270 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2271 lttng_create_tracepoint_event_if_missing(event_enabler
);
2274 case LTTNG_KERNEL_ABI_SYSCALL
:
2275 lttng_create_syscall_event_if_missing(event_enabler
);
2285 * Create events associated with an event_enabler (if not already present),
2286 * and add backward reference from the event to the enabler.
2287 * Should be called with sessions mutex held.
2290 int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler
*event_enabler
)
2292 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2293 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2294 struct lttng_event_enabler_common
*base_enabler
= lttng_event_recorder_enabler_as_enabler(event_enabler
);
2295 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2297 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2298 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2299 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2300 !strcmp(base_enabler
->event_param
.name
, "*")) {
2301 int enabled
= base_enabler
->enabled
;
2302 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2304 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2305 WRITE_ONCE(chan
->priv
->parent
.syscall_table
.syscall_all_entry
, enabled
);
2307 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2308 WRITE_ONCE(chan
->priv
->parent
.syscall_table
.syscall_all_exit
, enabled
);
2311 /* First ensure that probe events are created for this enabler. */
2312 lttng_create_event_if_missing(event_enabler
);
2314 /* For each event matching event_enabler in session event list. */
2315 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2316 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2317 struct lttng_enabler_ref
*enabler_ref
;
2319 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2321 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2322 lttng_event_recorder_enabler_as_enabler(event_enabler
));
2325 * If no backward ref, create it.
2326 * Add backward ref from event to event_enabler.
2328 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2331 enabler_ref
->ref
= lttng_event_recorder_enabler_as_enabler(event_enabler
);
2332 list_add(&enabler_ref
->node
,
2333 &event_recorder_priv
->parent
.enablers_ref_head
);
2337 * Link filter bytecodes if not linked yet.
2339 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2341 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2342 <tng_event_recorder_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2348 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2349 * tracepoint probes.
2350 * Should be called with sessions mutex held.
2353 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2355 switch (event_notifier_enabler
->parent
.event_param
.instrumentation
) {
2356 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2357 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2360 case LTTNG_KERNEL_ABI_SYSCALL
:
2361 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2371 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2374 int lttng_event_notifier_enabler_ref_event_notifiers(
2375 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2377 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2378 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2379 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2381 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2382 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2383 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2384 !strcmp(base_enabler
->event_param
.name
, "*")) {
2386 int enabled
= base_enabler
->enabled
;
2387 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2389 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2390 WRITE_ONCE(event_notifier_group
->syscall_table
.syscall_all_entry
, enabled
);
2392 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2393 WRITE_ONCE(event_notifier_group
->syscall_table
.syscall_all_exit
, enabled
);
2397 /* First ensure that probe event_notifiers are created for this enabler. */
2398 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2400 /* Link the created event_notifier with its associated enabler. */
2401 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2402 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2403 struct lttng_enabler_ref
*enabler_ref
;
2405 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2408 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2409 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2412 * If no backward ref, create it.
2413 * Add backward ref from event_notifier to enabler.
2415 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2419 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2420 event_notifier_enabler
);
2421 list_add(&enabler_ref
->node
,
2422 &event_notifier_priv
->parent
.enablers_ref_head
);
2426 * Link filter bytecodes if not linked yet.
2428 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2429 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2430 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2432 /* Link capture bytecodes if not linked yet. */
2433 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2434 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2435 &event_notifier_enabler
->capture_bytecode_head
);
2437 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2443 * Called at module load: connect the probe on all enablers matching
2445 * Called with sessions lock held.
2447 int lttng_fix_pending_events(void)
2449 struct lttng_kernel_session_private
*session_priv
;
2451 list_for_each_entry(session_priv
, &sessions
, list
)
2452 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2456 static bool lttng_event_notifier_group_has_active_event_notifiers(
2457 struct lttng_event_notifier_group
*event_notifier_group
)
2459 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2461 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2463 if (event_notifier_enabler
->parent
.enabled
)
2469 bool lttng_event_notifier_active(void)
2471 struct lttng_event_notifier_group
*event_notifier_group
;
2473 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2474 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2480 int lttng_fix_pending_event_notifiers(void)
2482 struct lttng_event_notifier_group
*event_notifier_group
;
2484 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2485 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2489 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2490 enum lttng_enabler_format_type format_type
,
2491 struct lttng_kernel_abi_event
*event_param
,
2492 struct lttng_kernel_channel_buffer
*chan
)
2494 struct lttng_event_recorder_enabler
*event_enabler
;
2496 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2499 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2500 event_enabler
->parent
.format_type
= format_type
;
2501 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2502 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2503 sizeof(event_enabler
->parent
.event_param
));
2504 event_enabler
->chan
= chan
;
2506 event_enabler
->parent
.enabled
= 0;
2507 return event_enabler
;
2510 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2511 struct lttng_event_recorder_enabler
*event_enabler
)
2513 mutex_lock(&sessions_mutex
);
2514 list_add(&event_enabler
->node
, &session
->priv
->enablers_head
);
2515 event_enabler
->published
= true;
2516 lttng_session_lazy_sync_event_enablers(session
);
2517 mutex_unlock(&sessions_mutex
);
2520 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2522 mutex_lock(&sessions_mutex
);
2523 event_enabler
->enabled
= 1;
2524 lttng_event_enabler_sync(event_enabler
);
2525 mutex_unlock(&sessions_mutex
);
2529 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2531 mutex_lock(&sessions_mutex
);
2532 event_enabler
->enabled
= 0;
2533 lttng_event_enabler_sync(event_enabler
);
2534 mutex_unlock(&sessions_mutex
);
2539 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2540 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2542 struct lttng_kernel_bytecode_node
*bytecode_node
;
2543 uint32_t bytecode_len
;
2546 ret
= get_user(bytecode_len
, &bytecode
->len
);
2549 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2553 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2554 sizeof(*bytecode
) + bytecode_len
);
2558 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2559 bytecode_node
->enabler
= enabler
;
2560 /* Enforce length based on allocated size */
2561 bytecode_node
->bc
.len
= bytecode_len
;
2562 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2567 lttng_kvfree(bytecode_node
);
2571 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2572 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2575 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2578 lttng_event_enabler_sync(event_enabler
);
2585 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2586 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2589 switch (event
->priv
->instrumentation
) {
2590 case LTTNG_KERNEL_ABI_UPROBE
:
2591 return lttng_uprobes_event_add_callsite(event
, callsite
);
2598 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2600 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2602 /* Destroy filter bytecode */
2603 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2604 &enabler
->filter_bytecode_head
, node
) {
2605 lttng_kvfree(filter_node
);
2609 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2611 switch (event_enabler
->enabler_type
) {
2612 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2614 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2615 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2617 lttng_enabler_destroy(event_enabler
);
2618 if (event_recorder_enabler
->published
)
2619 list_del(&event_recorder_enabler
->node
);
2620 kfree(event_recorder_enabler
);
2623 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2625 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2626 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2628 list_del(&event_notifier_enabler
->node
);
2629 lttng_enabler_destroy(event_enabler
);
2630 kfree(event_notifier_enabler
);
2638 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2639 struct lttng_event_notifier_group
*event_notifier_group
,
2640 enum lttng_enabler_format_type format_type
,
2641 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2643 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2645 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2646 if (!event_notifier_enabler
)
2649 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2650 event_notifier_enabler
->parent
.format_type
= format_type
;
2651 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2652 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2654 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2655 event_notifier_enabler
->num_captures
= 0;
2657 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2658 sizeof(event_notifier_enabler
->parent
.event_param
));
2660 event_notifier_enabler
->parent
.enabled
= 0;
2661 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2662 event_notifier_enabler
->group
= event_notifier_group
;
2664 mutex_lock(&sessions_mutex
);
2665 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2666 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2668 mutex_unlock(&sessions_mutex
);
2670 return event_notifier_enabler
;
2673 int lttng_event_notifier_enabler_enable(
2674 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2676 mutex_lock(&sessions_mutex
);
2677 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2678 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2679 mutex_unlock(&sessions_mutex
);
2683 int lttng_event_notifier_enabler_disable(
2684 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2686 mutex_lock(&sessions_mutex
);
2687 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2688 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2689 mutex_unlock(&sessions_mutex
);
2693 int lttng_event_notifier_enabler_attach_capture_bytecode(
2694 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2695 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2697 struct lttng_kernel_bytecode_node
*bytecode_node
;
2698 struct lttng_event_enabler_common
*enabler
=
2699 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2700 uint32_t bytecode_len
;
2703 ret
= get_user(bytecode_len
, &bytecode
->len
);
2707 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2712 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2713 sizeof(*bytecode
) + bytecode_len
);
2717 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2718 bytecode_node
->enabler
= enabler
;
2720 /* Enforce length based on allocated size */
2721 bytecode_node
->bc
.len
= bytecode_len
;
2722 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2724 event_notifier_enabler
->num_captures
++;
2726 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2730 lttng_kvfree(bytecode_node
);
2736 * lttng_session_sync_event_enablers should be called just before starting a
2738 * Should be called with sessions mutex held.
2741 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2743 struct lttng_event_recorder_enabler
*event_enabler
;
2744 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2746 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2747 lttng_event_enabler_ref_events(event_enabler
);
2749 * For each event, if at least one of its enablers is enabled,
2750 * and its channel and session transient states are enabled, we
2751 * enable the event, else we disable it.
2753 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2754 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2755 struct lttng_enabler_ref
*enabler_ref
;
2756 struct lttng_kernel_bytecode_runtime
*runtime
;
2757 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2760 switch (event_recorder_priv
->parent
.instrumentation
) {
2761 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2763 case LTTNG_KERNEL_ABI_SYSCALL
:
2765 list_for_each_entry(enabler_ref
,
2766 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2767 if (enabler_ref
->ref
->enabled
) {
2775 /* Not handled with lazy sync. */
2779 * Enabled state is based on union of enablers, with
2780 * intesection of session and channel transient enable
2783 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2785 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2787 * Sync tracepoint registration with event enabled
2791 register_event_recorder(event_recorder
);
2793 _lttng_event_recorder_unregister(event_recorder
);
2796 /* Check if has enablers without bytecode enabled */
2797 list_for_each_entry(enabler_ref
,
2798 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2799 if (enabler_ref
->ref
->enabled
2800 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2801 has_enablers_without_filter_bytecode
= 1;
2805 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2806 has_enablers_without_filter_bytecode
;
2808 /* Enable filters */
2809 list_for_each_entry(runtime
,
2810 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2811 lttng_bytecode_sync_state(runtime
);
2814 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2815 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2820 * Apply enablers to session events, adding events to session if need
2821 * be. It is required after each modification applied to an active
2822 * session, and right before session "start".
2823 * "lazy" sync means we only sync if required.
2824 * Should be called with sessions mutex held.
2827 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2829 /* We can skip if session is not active */
2830 if (!session
->active
)
2832 lttng_session_sync_event_enablers(session
);
2836 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2838 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2839 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2841 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2842 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2845 * For each event_notifier, if at least one of its enablers is enabled,
2846 * we enable the event_notifier, else we disable it.
2848 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2849 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2850 struct lttng_enabler_ref
*enabler_ref
;
2851 struct lttng_kernel_bytecode_runtime
*runtime
;
2852 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2853 int nr_filters
= 0, nr_captures
= 0;
2855 switch (event_notifier_priv
->parent
.instrumentation
) {
2856 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2858 case LTTNG_KERNEL_ABI_SYSCALL
:
2859 /* Enable event_notifiers */
2860 list_for_each_entry(enabler_ref
,
2861 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2862 if (enabler_ref
->ref
->enabled
) {
2870 /* Not handled with sync. */
2874 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2876 * Sync tracepoint registration with event_notifier enabled
2880 if (!event_notifier_priv
->parent
.registered
)
2881 register_event_notifier(event_notifier
);
2883 if (event_notifier_priv
->parent
.registered
)
2884 _lttng_event_notifier_unregister(event_notifier
);
2887 /* Check if has enablers without bytecode enabled */
2888 list_for_each_entry(enabler_ref
,
2889 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2890 if (enabler_ref
->ref
->enabled
2891 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2892 has_enablers_without_filter_bytecode
= 1;
2896 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2897 has_enablers_without_filter_bytecode
;
2899 /* Enable filters */
2900 list_for_each_entry(runtime
,
2901 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2902 lttng_bytecode_sync_state(runtime
);
2905 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2906 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2908 /* Enable captures */
2909 list_for_each_entry(runtime
,
2910 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2911 lttng_bytecode_sync_state(runtime
);
2914 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2919 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2921 switch (event_enabler
->enabler_type
) {
2922 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2924 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2925 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2926 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2929 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2931 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2932 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2933 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2942 * Serialize at most one packet worth of metadata into a metadata
2944 * We grab the metadata cache mutex to get exclusive access to our metadata
2945 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2946 * allows us to do racy operations such as looking for remaining space left in
2947 * packet and write, since mutual exclusion protects us from concurrent writes.
2948 * Mutual exclusion on the metadata cache allow us to read the cache content
2949 * without racing against reallocation of the cache by updates.
2950 * Returns the number of bytes written in the channel, 0 if no data
2951 * was written and a negative value on error.
2953 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2954 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2956 struct lttng_kernel_ring_buffer_ctx ctx
;
2958 size_t len
, reserve_len
;
2961 * Ensure we support mutiple get_next / put sequences followed by
2962 * put_next. The metadata cache lock protects reading the metadata
2963 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2964 * "flush" operations on the buffer invoked by different processes.
2965 * Moreover, since the metadata cache memory can be reallocated, we
2966 * need to have exclusive access against updates even though we only
2969 mutex_lock(&stream
->metadata_cache
->lock
);
2970 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2971 if (stream
->metadata_in
!= stream
->metadata_out
)
2974 /* Metadata regenerated, change the version. */
2975 if (stream
->metadata_cache
->version
!= stream
->version
)
2976 stream
->version
= stream
->metadata_cache
->version
;
2978 len
= stream
->metadata_cache
->metadata_written
-
2979 stream
->metadata_in
;
2982 reserve_len
= min_t(size_t,
2983 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2985 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2986 sizeof(char), NULL
);
2988 * If reservation failed, return an error to the caller.
2990 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2992 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2993 stream
->coherent
= false;
2996 stream
->transport
->ops
.event_write(&ctx
,
2997 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2999 stream
->transport
->ops
.event_commit(&ctx
);
3000 stream
->metadata_in
+= reserve_len
;
3001 if (reserve_len
< len
)
3002 stream
->coherent
= false;
3004 stream
->coherent
= true;
3009 *coherent
= stream
->coherent
;
3010 mutex_unlock(&stream
->metadata_cache
->lock
);
3015 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
3017 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
3018 mutex_lock(&session
->priv
->metadata_cache
->lock
);
3022 void lttng_metadata_end(struct lttng_kernel_session
*session
)
3024 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3025 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
3026 struct lttng_metadata_stream
*stream
;
3028 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
3029 wake_up_interruptible(&stream
->read_wait
);
3030 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
3035 * Write the metadata to the metadata cache.
3036 * Must be called with sessions_mutex held.
3037 * The metadata cache lock protects us from concurrent read access from
3038 * thread outputting metadata content to ring buffer.
3039 * The content of the printf is printed as a single atomic metadata
3042 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3043 const char *fmt
, ...)
3049 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3052 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3058 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3059 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3060 session
->priv
->metadata_cache
->cache_alloc
) {
3061 char *tmp_cache_realloc
;
3062 unsigned int tmp_cache_alloc_size
;
3064 tmp_cache_alloc_size
= max_t(unsigned int,
3065 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3066 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3067 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3068 if (!tmp_cache_realloc
)
3070 if (session
->priv
->metadata_cache
->data
) {
3071 memcpy(tmp_cache_realloc
,
3072 session
->priv
->metadata_cache
->data
,
3073 session
->priv
->metadata_cache
->cache_alloc
);
3074 vfree(session
->priv
->metadata_cache
->data
);
3077 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3078 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3080 memcpy(session
->priv
->metadata_cache
->data
+
3081 session
->priv
->metadata_cache
->metadata_written
,
3083 session
->priv
->metadata_cache
->metadata_written
+= len
;
3094 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3098 for (i
= 0; i
< nesting
; i
++) {
3101 ret
= lttng_metadata_printf(session
, " ");
3110 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3111 const struct lttng_kernel_event_field
*field
,
3114 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3118 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3119 const struct lttng_kernel_type_integer
*type
,
3120 enum lttng_kernel_string_encoding parent_encoding
,
3125 ret
= print_tabs(session
, nesting
);
3128 ret
= lttng_metadata_printf(session
,
3129 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3133 (parent_encoding
== lttng_kernel_string_encoding_none
)
3135 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3139 #if __BYTE_ORDER == __BIG_ENDIAN
3140 type
->reverse_byte_order
? " byte_order = le;" : ""
3142 type
->reverse_byte_order
? " byte_order = be;" : ""
3149 * Must be called with sessions_mutex held.
3152 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3153 const struct lttng_kernel_type_struct
*type
,
3156 const char *prev_field_name
= NULL
;
3158 uint32_t i
, nr_fields
;
3159 unsigned int alignment
;
3161 ret
= print_tabs(session
, nesting
);
3164 ret
= lttng_metadata_printf(session
,
3168 nr_fields
= type
->nr_fields
;
3169 for (i
= 0; i
< nr_fields
; i
++) {
3170 const struct lttng_kernel_event_field
*iter_field
;
3172 iter_field
= type
->fields
[i
];
3173 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3177 ret
= print_tabs(session
, nesting
);
3180 alignment
= type
->alignment
;
3182 ret
= lttng_metadata_printf(session
,
3186 ret
= lttng_metadata_printf(session
,
3193 * Must be called with sessions_mutex held.
3196 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3197 const struct lttng_kernel_event_field
*field
,
3202 ret
= _lttng_struct_type_statedump(session
,
3203 lttng_kernel_get_type_struct(field
->type
), nesting
);
3206 return lttng_field_name_statedump(session
, field
, nesting
);
3210 * Must be called with sessions_mutex held.
3213 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3214 const struct lttng_kernel_type_variant
*type
,
3216 const char *prev_field_name
)
3218 const char *tag_name
;
3220 uint32_t i
, nr_choices
;
3222 tag_name
= type
->tag_name
;
3224 tag_name
= prev_field_name
;
3228 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3230 if (type
->alignment
!= 0)
3232 ret
= print_tabs(session
, nesting
);
3235 ret
= lttng_metadata_printf(session
,
3236 "variant <_%s> {\n",
3240 nr_choices
= type
->nr_choices
;
3241 for (i
= 0; i
< nr_choices
; i
++) {
3242 const struct lttng_kernel_event_field
*iter_field
;
3244 iter_field
= type
->choices
[i
];
3245 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3249 ret
= print_tabs(session
, nesting
);
3252 ret
= lttng_metadata_printf(session
,
3258 * Must be called with sessions_mutex held.
3261 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3262 const struct lttng_kernel_event_field
*field
,
3264 const char *prev_field_name
)
3268 ret
= _lttng_variant_type_statedump(session
,
3269 lttng_kernel_get_type_variant(field
->type
), nesting
,
3273 return lttng_field_name_statedump(session
, field
, nesting
);
3277 * Must be called with sessions_mutex held.
3280 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3281 const struct lttng_kernel_event_field
*field
,
3285 const struct lttng_kernel_type_array
*array_type
;
3286 const struct lttng_kernel_type_common
*elem_type
;
3288 array_type
= lttng_kernel_get_type_array(field
->type
);
3289 WARN_ON_ONCE(!array_type
);
3291 if (array_type
->alignment
) {
3292 ret
= print_tabs(session
, nesting
);
3295 ret
= lttng_metadata_printf(session
,
3296 "struct { } align(%u) _%s_padding;\n",
3297 array_type
->alignment
* CHAR_BIT
,
3303 * Nested compound types: Only array of structures and variants are
3304 * currently supported.
3306 elem_type
= array_type
->elem_type
;
3307 switch (elem_type
->type
) {
3308 case lttng_kernel_type_integer
:
3309 case lttng_kernel_type_struct
:
3310 case lttng_kernel_type_variant
:
3311 ret
= _lttng_type_statedump(session
, elem_type
,
3312 array_type
->encoding
, nesting
);
3320 ret
= lttng_metadata_printf(session
,
3323 array_type
->length
);
3328 * Must be called with sessions_mutex held.
3331 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3332 const struct lttng_kernel_event_field
*field
,
3334 const char *prev_field_name
)
3337 const char *length_name
;
3338 const struct lttng_kernel_type_sequence
*sequence_type
;
3339 const struct lttng_kernel_type_common
*elem_type
;
3341 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3342 WARN_ON_ONCE(!sequence_type
);
3344 length_name
= sequence_type
->length_name
;
3346 length_name
= prev_field_name
;
3350 if (sequence_type
->alignment
) {
3351 ret
= print_tabs(session
, nesting
);
3354 ret
= lttng_metadata_printf(session
,
3355 "struct { } align(%u) _%s_padding;\n",
3356 sequence_type
->alignment
* CHAR_BIT
,
3363 * Nested compound types: Only array of structures and variants are
3364 * currently supported.
3366 elem_type
= sequence_type
->elem_type
;
3367 switch (elem_type
->type
) {
3368 case lttng_kernel_type_integer
:
3369 case lttng_kernel_type_struct
:
3370 case lttng_kernel_type_variant
:
3371 ret
= _lttng_type_statedump(session
, elem_type
,
3372 sequence_type
->encoding
, nesting
);
3380 ret
= lttng_metadata_printf(session
,
3388 * Must be called with sessions_mutex held.
3391 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3392 const struct lttng_kernel_type_enum
*type
,
3395 const struct lttng_kernel_enum_desc
*enum_desc
;
3396 const struct lttng_kernel_type_common
*container_type
;
3398 unsigned int i
, nr_entries
;
3400 container_type
= type
->container_type
;
3401 if (container_type
->type
!= lttng_kernel_type_integer
) {
3405 enum_desc
= type
->desc
;
3406 nr_entries
= enum_desc
->nr_entries
;
3408 ret
= print_tabs(session
, nesting
);
3411 ret
= lttng_metadata_printf(session
, "enum : ");
3414 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3415 lttng_kernel_string_encoding_none
, 0);
3418 ret
= lttng_metadata_printf(session
, " {\n");
3421 /* Dump all entries */
3422 for (i
= 0; i
< nr_entries
; i
++) {
3423 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3426 ret
= print_tabs(session
, nesting
+ 1);
3429 ret
= lttng_metadata_printf(session
,
3433 len
= strlen(entry
->string
);
3434 /* Escape the character '"' */
3435 for (j
= 0; j
< len
; j
++) {
3436 char c
= entry
->string
[j
];
3440 ret
= lttng_metadata_printf(session
,
3444 ret
= lttng_metadata_printf(session
,
3448 ret
= lttng_metadata_printf(session
,
3455 ret
= lttng_metadata_printf(session
, "\"");
3459 if (entry
->options
.is_auto
) {
3460 ret
= lttng_metadata_printf(session
, ",\n");
3464 ret
= lttng_metadata_printf(session
,
3468 if (entry
->start
.signedness
)
3469 ret
= lttng_metadata_printf(session
,
3470 "%lld", (long long) entry
->start
.value
);
3472 ret
= lttng_metadata_printf(session
,
3473 "%llu", entry
->start
.value
);
3476 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3478 == entry
->end
.value
) {
3479 ret
= lttng_metadata_printf(session
,
3482 if (entry
->end
.signedness
) {
3483 ret
= lttng_metadata_printf(session
,
3485 (long long) entry
->end
.value
);
3487 ret
= lttng_metadata_printf(session
,
3496 ret
= print_tabs(session
, nesting
);
3499 ret
= lttng_metadata_printf(session
, "}");
3505 * Must be called with sessions_mutex held.
3508 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3509 const struct lttng_kernel_event_field
*field
,
3513 const struct lttng_kernel_type_enum
*enum_type
;
3515 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3516 WARN_ON_ONCE(!enum_type
);
3517 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3520 return lttng_field_name_statedump(session
, field
, nesting
);
3524 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3525 const struct lttng_kernel_event_field
*field
,
3530 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3531 lttng_kernel_string_encoding_none
, nesting
);
3534 return lttng_field_name_statedump(session
, field
, nesting
);
3538 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3539 const struct lttng_kernel_type_string
*type
,
3544 /* Default encoding is UTF8 */
3545 ret
= print_tabs(session
, nesting
);
3548 ret
= lttng_metadata_printf(session
,
3550 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3551 " { encoding = ASCII; }" : "");
3556 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3557 const struct lttng_kernel_event_field
*field
,
3560 const struct lttng_kernel_type_string
*string_type
;
3563 string_type
= lttng_kernel_get_type_string(field
->type
);
3564 WARN_ON_ONCE(!string_type
);
3565 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3568 return lttng_field_name_statedump(session
, field
, nesting
);
3572 * Must be called with sessions_mutex held.
3575 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3576 const struct lttng_kernel_type_common
*type
,
3577 enum lttng_kernel_string_encoding parent_encoding
,
3582 switch (type
->type
) {
3583 case lttng_kernel_type_integer
:
3584 ret
= _lttng_integer_type_statedump(session
,
3585 lttng_kernel_get_type_integer(type
),
3586 parent_encoding
, nesting
);
3588 case lttng_kernel_type_enum
:
3589 ret
= _lttng_enum_type_statedump(session
,
3590 lttng_kernel_get_type_enum(type
),
3593 case lttng_kernel_type_string
:
3594 ret
= _lttng_string_type_statedump(session
,
3595 lttng_kernel_get_type_string(type
),
3598 case lttng_kernel_type_struct
:
3599 ret
= _lttng_struct_type_statedump(session
,
3600 lttng_kernel_get_type_struct(type
),
3603 case lttng_kernel_type_variant
:
3604 ret
= _lttng_variant_type_statedump(session
,
3605 lttng_kernel_get_type_variant(type
),
3609 /* Nested arrays and sequences are not supported yet. */
3610 case lttng_kernel_type_array
:
3611 case lttng_kernel_type_sequence
:
3620 * Must be called with sessions_mutex held.
3623 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3624 const struct lttng_kernel_event_field
*field
,
3626 const char **prev_field_name_p
)
3628 const char *prev_field_name
= NULL
;
3631 if (prev_field_name_p
)
3632 prev_field_name
= *prev_field_name_p
;
3633 switch (field
->type
->type
) {
3634 case lttng_kernel_type_integer
:
3635 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3637 case lttng_kernel_type_enum
:
3638 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3640 case lttng_kernel_type_string
:
3641 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3643 case lttng_kernel_type_struct
:
3644 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3646 case lttng_kernel_type_array
:
3647 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3649 case lttng_kernel_type_sequence
:
3650 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3652 case lttng_kernel_type_variant
:
3653 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3660 if (prev_field_name_p
)
3661 *prev_field_name_p
= field
->name
;
3666 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3667 struct lttng_kernel_ctx
*ctx
)
3669 const char *prev_field_name
= NULL
;
3675 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3676 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3678 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3686 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3687 struct lttng_kernel_event_recorder
*event_recorder
)
3689 const char *prev_field_name
= NULL
;
3690 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3694 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3695 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3697 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3705 * Must be called with sessions_mutex held.
3706 * The entire event metadata is printed as a single atomic metadata
3710 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3711 struct lttng_kernel_channel_buffer
*chan
,
3712 struct lttng_kernel_event_recorder
*event_recorder
)
3716 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3718 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3721 lttng_metadata_begin(session
);
3723 ret
= lttng_metadata_printf(session
,
3727 " stream_id = %u;\n",
3728 event_recorder
->priv
->parent
.desc
->event_name
,
3729 event_recorder
->priv
->id
,
3730 event_recorder
->chan
->priv
->id
);
3734 ret
= lttng_metadata_printf(session
,
3735 " fields := struct {\n"
3740 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3745 * LTTng space reservation can only reserve multiples of the
3748 ret
= lttng_metadata_printf(session
,
3754 event_recorder
->priv
->metadata_dumped
= 1;
3756 lttng_metadata_end(session
);
3762 * Must be called with sessions_mutex held.
3763 * The entire channel metadata is printed as a single atomic metadata
3767 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3768 struct lttng_kernel_channel_buffer
*chan
)
3772 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3775 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3778 lttng_metadata_begin(session
);
3780 WARN_ON_ONCE(!chan
->priv
->header_type
);
3781 ret
= lttng_metadata_printf(session
,
3784 " event.header := %s;\n"
3785 " packet.context := struct packet_context;\n",
3787 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3788 "struct event_header_large");
3792 if (chan
->priv
->ctx
) {
3793 ret
= lttng_metadata_printf(session
,
3794 " event.context := struct {\n");
3798 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3801 if (chan
->priv
->ctx
) {
3802 ret
= lttng_metadata_printf(session
,
3808 ret
= lttng_metadata_printf(session
,
3811 chan
->priv
->metadata_dumped
= 1;
3813 lttng_metadata_end(session
);
3818 * Must be called with sessions_mutex held.
3821 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3823 return lttng_metadata_printf(session
,
3824 "struct packet_context {\n"
3825 " uint64_clock_monotonic_t timestamp_begin;\n"
3826 " uint64_clock_monotonic_t timestamp_end;\n"
3827 " uint64_t content_size;\n"
3828 " uint64_t packet_size;\n"
3829 " uint64_t packet_seq_num;\n"
3830 " unsigned long events_discarded;\n"
3831 " uint32_t cpu_id;\n"
3838 * id: range: 0 - 30.
3839 * id 31 is reserved to indicate an extended header.
3842 * id: range: 0 - 65534.
3843 * id 65535 is reserved to indicate an extended header.
3845 * Must be called with sessions_mutex held.
3848 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3850 return lttng_metadata_printf(session
,
3851 "struct event_header_compact {\n"
3852 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3855 " uint27_clock_monotonic_t timestamp;\n"
3859 " uint64_clock_monotonic_t timestamp;\n"
3864 "struct event_header_large {\n"
3865 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3868 " uint32_clock_monotonic_t timestamp;\n"
3872 " uint64_clock_monotonic_t timestamp;\n"
3876 lttng_alignof(uint32_t) * CHAR_BIT
,
3877 lttng_alignof(uint16_t) * CHAR_BIT
3882 * Approximation of NTP time of day to clock monotonic correlation,
3883 * taken at start of trace.
3884 * Yes, this is only an approximation. Yes, we can (and will) do better
3885 * in future versions.
3886 * This function may return a negative offset. It may happen if the
3887 * system sets the REALTIME clock to 0 after boot.
3889 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3893 int64_t measure_clock_offset(void)
3895 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3896 uint64_t tcf
= trace_clock_freq();
3898 unsigned long flags
;
3899 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3900 struct timespec64 rts
= { 0, 0 };
3902 struct timespec rts
= { 0, 0 };
3905 /* Disable interrupts to increase correlation precision. */
3906 local_irq_save(flags
);
3907 monotonic
[0] = trace_clock_read64();
3908 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3909 ktime_get_real_ts64(&rts
);
3911 getnstimeofday(&rts
);
3913 monotonic
[1] = trace_clock_read64();
3914 local_irq_restore(flags
);
3916 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3917 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3918 if (tcf
== NSEC_PER_SEC
) {
3919 realtime
+= rts
.tv_nsec
;
3921 uint64_t n
= rts
.tv_nsec
* tcf
;
3923 do_div(n
, NSEC_PER_SEC
);
3926 offset
= (int64_t) realtime
- monotonic_avg
;
3931 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3939 while (cur
!= '\0') {
3942 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3946 ret
= lttng_metadata_printf(session
, "%c", '\\');
3949 /* We still print the current char */
3952 ret
= lttng_metadata_printf(session
, "%c", cur
);
3966 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3967 const char *field_value
)
3971 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3975 ret
= print_escaped_ctf_string(session
, field_value
);
3979 ret
= lttng_metadata_printf(session
, "\";\n");
3986 * Output metadata into this session's metadata buffers.
3987 * Must be called with sessions_mutex held.
3990 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3992 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3993 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3994 const char *product_uuid
;
3995 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3996 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3999 if (!LTTNG_READ_ONCE(session
->active
))
4002 lttng_metadata_begin(session
);
4004 if (session
->priv
->metadata_dumped
)
4007 snprintf(uuid_s
, sizeof(uuid_s
),
4008 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
4009 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
4010 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
4011 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
4012 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
4014 ret
= lttng_metadata_printf(session
,
4015 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4016 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4017 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4018 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4019 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4020 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4021 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4027 " byte_order = %s;\n"
4028 " packet.header := struct {\n"
4029 " uint32_t magic;\n"
4030 " uint8_t uuid[16];\n"
4031 " uint32_t stream_id;\n"
4032 " uint64_t stream_instance_id;\n"
4035 lttng_alignof(uint8_t) * CHAR_BIT
,
4036 lttng_alignof(uint16_t) * CHAR_BIT
,
4037 lttng_alignof(uint32_t) * CHAR_BIT
,
4038 lttng_alignof(uint64_t) * CHAR_BIT
,
4039 sizeof(unsigned long) * CHAR_BIT
,
4040 lttng_alignof(unsigned long) * CHAR_BIT
,
4044 #if __BYTE_ORDER == __BIG_ENDIAN
4053 ret
= lttng_metadata_printf(session
,
4055 " hostname = \"%s\";\n"
4056 " domain = \"kernel\";\n"
4057 " sysname = \"%s\";\n"
4058 " kernel_release = \"%s\";\n"
4059 " kernel_version = \"%s\";\n"
4060 " tracer_name = \"lttng-modules\";\n"
4061 " tracer_major = %d;\n"
4062 " tracer_minor = %d;\n"
4063 " tracer_patchlevel = %d;\n"
4064 " trace_buffering_scheme = \"global\";\n",
4065 current
->nsproxy
->uts_ns
->name
.nodename
,
4069 LTTNG_MODULES_MAJOR_VERSION
,
4070 LTTNG_MODULES_MINOR_VERSION
,
4071 LTTNG_MODULES_PATCHLEVEL_VERSION
4076 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4079 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4080 session
->priv
->creation_time
);
4084 /* Add the product UUID to the 'env' section */
4085 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4087 ret
= lttng_metadata_printf(session
,
4088 " product_uuid = \"%s\";\n",
4095 /* Close the 'env' section */
4096 ret
= lttng_metadata_printf(session
, "};\n\n");
4100 ret
= lttng_metadata_printf(session
,
4102 " name = \"%s\";\n",
4108 if (!trace_clock_uuid(clock_uuid_s
)) {
4109 ret
= lttng_metadata_printf(session
,
4110 " uuid = \"%s\";\n",
4117 ret
= lttng_metadata_printf(session
,
4118 " description = \"%s\";\n"
4119 " freq = %llu; /* Frequency, in Hz */\n"
4120 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4123 trace_clock_description(),
4124 (unsigned long long) trace_clock_freq(),
4125 (long long) measure_clock_offset()
4130 ret
= lttng_metadata_printf(session
,
4131 "typealias integer {\n"
4132 " size = 27; align = 1; signed = false;\n"
4133 " map = clock.%s.value;\n"
4134 "} := uint27_clock_monotonic_t;\n"
4136 "typealias integer {\n"
4137 " size = 32; align = %u; signed = false;\n"
4138 " map = clock.%s.value;\n"
4139 "} := uint32_clock_monotonic_t;\n"
4141 "typealias integer {\n"
4142 " size = 64; align = %u; signed = false;\n"
4143 " map = clock.%s.value;\n"
4144 "} := uint64_clock_monotonic_t;\n\n",
4146 lttng_alignof(uint32_t) * CHAR_BIT
,
4148 lttng_alignof(uint64_t) * CHAR_BIT
,
4154 ret
= _lttng_stream_packet_context_declare(session
);
4158 ret
= _lttng_event_header_declare(session
);
4163 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4164 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4169 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4170 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4171 event_recorder_priv
->pub
);
4175 session
->priv
->metadata_dumped
= 1;
4177 lttng_metadata_end(session
);
4182 * lttng_transport_register - LTT transport registration
4183 * @transport: transport structure
4185 * Registers a transport which can be used as output to extract the data out of
4186 * LTTng. The module calling this registration function must ensure that no
4187 * trap-inducing code will be executed by the transport functions. E.g.
4188 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4189 * is made visible to the transport function. This registration acts as a
4190 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4191 * after its registration must it synchronize the TLBs.
4193 void lttng_transport_register(struct lttng_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_transport_list
);
4204 mutex_unlock(&sessions_mutex
);
4206 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4209 * lttng_transport_unregister - LTT transport unregistration
4210 * @transport: transport structure
4212 void lttng_transport_unregister(struct lttng_transport
*transport
)
4214 mutex_lock(&sessions_mutex
);
4215 list_del(&transport
->node
);
4216 mutex_unlock(&sessions_mutex
);
4218 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4220 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4223 * Make sure no page fault can be triggered by the module about to be
4224 * registered. We deal with this here so we don't have to call
4225 * vmalloc_sync_mappings() in each module's init.
4227 wrapper_vmalloc_sync_mappings();
4229 mutex_lock(&sessions_mutex
);
4230 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4231 mutex_unlock(&sessions_mutex
);
4233 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4235 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4237 mutex_lock(&sessions_mutex
);
4238 list_del(&transport
->node
);
4239 mutex_unlock(&sessions_mutex
);
4241 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4243 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4245 enum cpuhp_state lttng_hp_prepare
;
4246 enum cpuhp_state lttng_hp_online
;
4248 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4250 struct lttng_cpuhp_node
*lttng_node
;
4252 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4253 switch (lttng_node
->component
) {
4254 case LTTNG_RING_BUFFER_FRONTEND
:
4256 case LTTNG_RING_BUFFER_BACKEND
:
4257 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4258 case LTTNG_RING_BUFFER_ITER
:
4260 case LTTNG_CONTEXT_PERF_COUNTERS
:
4267 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4269 struct lttng_cpuhp_node
*lttng_node
;
4271 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4272 switch (lttng_node
->component
) {
4273 case LTTNG_RING_BUFFER_FRONTEND
:
4274 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4275 case LTTNG_RING_BUFFER_BACKEND
:
4277 case LTTNG_RING_BUFFER_ITER
:
4279 case LTTNG_CONTEXT_PERF_COUNTERS
:
4280 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4286 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4288 struct lttng_cpuhp_node
*lttng_node
;
4290 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4291 switch (lttng_node
->component
) {
4292 case LTTNG_RING_BUFFER_FRONTEND
:
4293 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4294 case LTTNG_RING_BUFFER_BACKEND
:
4296 case LTTNG_RING_BUFFER_ITER
:
4297 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4298 case LTTNG_CONTEXT_PERF_COUNTERS
:
4299 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4305 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4307 struct lttng_cpuhp_node
*lttng_node
;
4309 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4310 switch (lttng_node
->component
) {
4311 case LTTNG_RING_BUFFER_FRONTEND
:
4312 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4313 case LTTNG_RING_BUFFER_BACKEND
:
4315 case LTTNG_RING_BUFFER_ITER
:
4317 case LTTNG_CONTEXT_PERF_COUNTERS
:
4324 static int __init
lttng_init_cpu_hotplug(void)
4328 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4329 lttng_hotplug_prepare
,
4330 lttng_hotplug_dead
);
4334 lttng_hp_prepare
= ret
;
4335 lttng_rb_set_hp_prepare(ret
);
4337 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4338 lttng_hotplug_online
,
4339 lttng_hotplug_offline
);
4341 cpuhp_remove_multi_state(lttng_hp_prepare
);
4342 lttng_hp_prepare
= 0;
4345 lttng_hp_online
= ret
;
4346 lttng_rb_set_hp_online(ret
);
4351 static void __exit
lttng_exit_cpu_hotplug(void)
4353 lttng_rb_set_hp_online(0);
4354 cpuhp_remove_multi_state(lttng_hp_online
);
4355 lttng_rb_set_hp_prepare(0);
4356 cpuhp_remove_multi_state(lttng_hp_prepare
);
4359 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4360 static int lttng_init_cpu_hotplug(void)
4364 static void lttng_exit_cpu_hotplug(void)
4367 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4369 static int __init
lttng_events_init(void)
4373 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4376 ret
= wrapper_get_pfnblock_flags_mask_init();
4379 ret
= wrapper_get_pageblock_flags_mask_init();
4382 ret
= lttng_probes_init();
4385 ret
= lttng_context_init();
4388 ret
= lttng_tracepoint_init();
4391 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4392 if (!event_recorder_cache
) {
4394 goto error_kmem_event_recorder
;
4396 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4397 if (!event_recorder_private_cache
) {
4399 goto error_kmem_event_recorder_private
;
4401 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4402 if (!event_notifier_cache
) {
4404 goto error_kmem_event_notifier
;
4406 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4407 if (!event_notifier_private_cache
) {
4409 goto error_kmem_event_notifier_private
;
4411 ret
= lttng_abi_init();
4414 ret
= lttng_logger_init();
4417 ret
= lttng_init_cpu_hotplug();
4420 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4421 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4422 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4423 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4424 LTTNG_MODULES_EXTRAVERSION
,
4426 #ifdef LTTNG_EXTRA_VERSION_GIT
4427 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4431 #ifdef LTTNG_EXTRA_VERSION_NAME
4432 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4436 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4437 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4438 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4442 lttng_logger_exit();
4446 kmem_cache_destroy(event_notifier_private_cache
);
4447 error_kmem_event_notifier_private
:
4448 kmem_cache_destroy(event_notifier_cache
);
4449 error_kmem_event_notifier
:
4450 kmem_cache_destroy(event_recorder_private_cache
);
4451 error_kmem_event_recorder_private
:
4452 kmem_cache_destroy(event_recorder_cache
);
4453 error_kmem_event_recorder
:
4454 lttng_tracepoint_exit();
4456 lttng_context_exit();
4457 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4458 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4459 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4460 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4461 LTTNG_MODULES_EXTRAVERSION
,
4463 #ifdef LTTNG_EXTRA_VERSION_GIT
4464 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4468 #ifdef LTTNG_EXTRA_VERSION_NAME
4469 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4476 module_init(lttng_events_init
);
4478 static void __exit
lttng_events_exit(void)
4480 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4482 lttng_exit_cpu_hotplug();
4483 lttng_logger_exit();
4485 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4486 lttng_session_destroy(session_priv
->pub
);
4487 kmem_cache_destroy(event_recorder_cache
);
4488 kmem_cache_destroy(event_recorder_private_cache
);
4489 kmem_cache_destroy(event_notifier_cache
);
4490 kmem_cache_destroy(event_notifier_private_cache
);
4491 lttng_tracepoint_exit();
4492 lttng_context_exit();
4493 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4494 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4495 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4496 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4497 LTTNG_MODULES_EXTRAVERSION
,
4499 #ifdef LTTNG_EXTRA_VERSION_GIT
4500 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4504 #ifdef LTTNG_EXTRA_VERSION_NAME
4505 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4511 module_exit(lttng_events_exit
);
4513 #include <generated/patches.h>
4514 #ifdef LTTNG_EXTRA_VERSION_GIT
4515 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4517 #ifdef LTTNG_EXTRA_VERSION_NAME
4518 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4520 MODULE_LICENSE("GPL and additional rights");
4521 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4522 MODULE_DESCRIPTION("LTTng tracer");
4523 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4524 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4525 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4526 LTTNG_MODULES_EXTRAVERSION
);