1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/tracer.h>
40 #include <lttng/event-notifier-notification.h>
41 #include <lttng/abi-old.h>
42 #include <lttng/endian.h>
43 #include <lttng/string-utils.h>
44 #include <lttng/utils.h>
45 #include <ringbuffer/backend.h>
46 #include <ringbuffer/frontend.h>
47 #include <wrapper/time.h>
49 #define METADATA_CACHE_DEFAULT_SIZE 4096
51 static LIST_HEAD(sessions
);
52 static LIST_HEAD(event_notifier_groups
);
53 static LIST_HEAD(lttng_transport_list
);
55 * Protect the sessions and metadata caches.
57 static DEFINE_MUTEX(sessions_mutex
);
58 static struct kmem_cache
*event_cache
;
59 static struct kmem_cache
*event_notifier_cache
;
61 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
62 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
63 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
64 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
65 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
67 static void _lttng_event_destroy(struct lttng_event
*event
);
68 static void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
);
69 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
70 static int _lttng_event_unregister(struct lttng_event
*event
);
71 static int _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
);
73 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
74 struct lttng_channel
*chan
,
75 struct lttng_event
*event
);
77 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
79 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
81 int _lttng_type_statedump(struct lttng_session
*session
,
82 const struct lttng_type
*type
,
85 int _lttng_field_statedump(struct lttng_session
*session
,
86 const struct lttng_event_field
*field
,
89 void synchronize_trace(void)
91 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
97 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
98 #ifdef CONFIG_PREEMPT_RT_FULL
101 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
102 #ifdef CONFIG_PREEMPT_RT
105 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
108 void lttng_lock_sessions(void)
110 mutex_lock(&sessions_mutex
);
113 void lttng_unlock_sessions(void)
115 mutex_unlock(&sessions_mutex
);
118 static struct lttng_transport
*lttng_transport_find(const char *name
)
120 struct lttng_transport
*transport
;
122 list_for_each_entry(transport
, <tng_transport_list
, node
) {
123 if (!strcmp(transport
->name
, name
))
130 * Called with sessions lock held.
132 int lttng_session_active(void)
134 struct lttng_session
*iter
;
136 list_for_each_entry(iter
, &sessions
, list
) {
143 struct lttng_session
*lttng_session_create(void)
145 struct lttng_session
*session
;
146 struct lttng_metadata_cache
*metadata_cache
;
149 mutex_lock(&sessions_mutex
);
150 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
153 INIT_LIST_HEAD(&session
->chan
);
154 INIT_LIST_HEAD(&session
->events
);
155 lttng_guid_gen(&session
->uuid
);
157 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
160 goto err_free_session
;
161 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
162 if (!metadata_cache
->data
)
164 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
165 kref_init(&metadata_cache
->refcount
);
166 mutex_init(&metadata_cache
->lock
);
167 session
->metadata_cache
= metadata_cache
;
168 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
169 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
170 sizeof(metadata_cache
->uuid
));
171 INIT_LIST_HEAD(&session
->enablers_head
);
172 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
173 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
174 list_add(&session
->list
, &sessions
);
175 session
->pid_tracker
.session
= session
;
176 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
177 session
->vpid_tracker
.session
= session
;
178 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
179 session
->uid_tracker
.session
= session
;
180 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
181 session
->vuid_tracker
.session
= session
;
182 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
183 session
->gid_tracker
.session
= session
;
184 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
185 session
->vgid_tracker
.session
= session
;
186 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
187 mutex_unlock(&sessions_mutex
);
191 kfree(metadata_cache
);
193 lttng_kvfree(session
);
195 mutex_unlock(&sessions_mutex
);
199 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
201 struct lttng_transport
*transport
= NULL
;
202 struct lttng_event_notifier_group
*event_notifier_group
;
203 const char *transport_name
= "relay-event-notifier";
204 size_t subbuf_size
= 4096; //TODO
205 size_t num_subbuf
= 16; //TODO
206 unsigned int switch_timer_interval
= 0;
207 unsigned int read_timer_interval
= 0;
210 mutex_lock(&sessions_mutex
);
212 transport
= lttng_transport_find(transport_name
);
214 printk(KERN_WARNING
"LTTng: transport %s not found\n",
218 if (!try_module_get(transport
->owner
)) {
219 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
224 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
226 if (!event_notifier_group
)
230 * Initialize the ring buffer used to store event notifier
233 event_notifier_group
->ops
= &transport
->ops
;
234 event_notifier_group
->chan
= transport
->ops
.channel_create(
235 transport_name
, event_notifier_group
, NULL
,
236 subbuf_size
, num_subbuf
, switch_timer_interval
,
237 read_timer_interval
);
238 if (!event_notifier_group
->chan
)
241 event_notifier_group
->transport
= transport
;
243 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
244 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
245 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
246 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
248 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
250 mutex_unlock(&sessions_mutex
);
252 return event_notifier_group
;
255 lttng_kvfree(event_notifier_group
);
258 module_put(transport
->owner
);
260 mutex_unlock(&sessions_mutex
);
264 void metadata_cache_destroy(struct kref
*kref
)
266 struct lttng_metadata_cache
*cache
=
267 container_of(kref
, struct lttng_metadata_cache
, refcount
);
272 void lttng_session_destroy(struct lttng_session
*session
)
274 struct lttng_channel
*chan
, *tmpchan
;
275 struct lttng_event
*event
, *tmpevent
;
276 struct lttng_metadata_stream
*metadata_stream
;
277 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
280 mutex_lock(&sessions_mutex
);
281 WRITE_ONCE(session
->active
, 0);
282 list_for_each_entry(chan
, &session
->chan
, list
) {
283 ret
= lttng_syscalls_unregister_event(chan
);
286 list_for_each_entry(event
, &session
->events
, list
) {
287 ret
= _lttng_event_unregister(event
);
290 synchronize_trace(); /* Wait for in-flight events to complete */
291 list_for_each_entry(chan
, &session
->chan
, list
) {
292 ret
= lttng_syscalls_destroy_event(chan
);
295 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
296 &session
->enablers_head
, node
)
297 lttng_event_enabler_destroy(event_enabler
);
298 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
299 _lttng_event_destroy(event
);
300 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
301 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
302 _lttng_channel_destroy(chan
);
304 mutex_lock(&session
->metadata_cache
->lock
);
305 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
306 _lttng_metadata_channel_hangup(metadata_stream
);
307 mutex_unlock(&session
->metadata_cache
->lock
);
308 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
309 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
310 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
311 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
312 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
313 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
314 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
315 list_del(&session
->list
);
316 mutex_unlock(&sessions_mutex
);
317 lttng_kvfree(session
);
320 void lttng_event_notifier_group_destroy(
321 struct lttng_event_notifier_group
*event_notifier_group
)
323 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
324 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
327 if (!event_notifier_group
)
330 mutex_lock(&sessions_mutex
);
332 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
333 &event_notifier_group
->event_notifiers_head
, list
) {
334 ret
= _lttng_event_notifier_unregister(event_notifier
);
338 /* Wait for in-flight event notifier to complete */
341 irq_work_sync(&event_notifier_group
->wakeup_pending
);
343 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
344 &event_notifier_group
->enablers_head
, node
)
345 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
347 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
348 &event_notifier_group
->event_notifiers_head
, list
)
349 _lttng_event_notifier_destroy(event_notifier
);
351 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
352 module_put(event_notifier_group
->transport
->owner
);
353 list_del(&event_notifier_group
->node
);
355 mutex_unlock(&sessions_mutex
);
356 lttng_kvfree(event_notifier_group
);
359 int lttng_session_statedump(struct lttng_session
*session
)
363 mutex_lock(&sessions_mutex
);
364 ret
= lttng_statedump_start(session
);
365 mutex_unlock(&sessions_mutex
);
369 int lttng_session_enable(struct lttng_session
*session
)
372 struct lttng_channel
*chan
;
374 mutex_lock(&sessions_mutex
);
375 if (session
->active
) {
380 /* Set transient enabler state to "enabled" */
383 /* We need to sync enablers with session before activation. */
384 lttng_session_sync_event_enablers(session
);
387 * Snapshot the number of events per channel to know the type of header
390 list_for_each_entry(chan
, &session
->chan
, list
) {
391 if (chan
->header_type
)
392 continue; /* don't change it if session stop/restart */
393 if (chan
->free_event_id
< 31)
394 chan
->header_type
= 1; /* compact */
396 chan
->header_type
= 2; /* large */
399 /* Clear each stream's quiescent state. */
400 list_for_each_entry(chan
, &session
->chan
, list
) {
401 if (chan
->channel_type
!= METADATA_CHANNEL
)
402 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
405 WRITE_ONCE(session
->active
, 1);
406 WRITE_ONCE(session
->been_active
, 1);
407 ret
= _lttng_session_metadata_statedump(session
);
409 WRITE_ONCE(session
->active
, 0);
412 ret
= lttng_statedump_start(session
);
414 WRITE_ONCE(session
->active
, 0);
416 mutex_unlock(&sessions_mutex
);
420 int lttng_session_disable(struct lttng_session
*session
)
423 struct lttng_channel
*chan
;
425 mutex_lock(&sessions_mutex
);
426 if (!session
->active
) {
430 WRITE_ONCE(session
->active
, 0);
432 /* Set transient enabler state to "disabled" */
434 lttng_session_sync_event_enablers(session
);
436 /* Set each stream's quiescent state. */
437 list_for_each_entry(chan
, &session
->chan
, list
) {
438 if (chan
->channel_type
!= METADATA_CHANNEL
)
439 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
442 mutex_unlock(&sessions_mutex
);
446 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
449 struct lttng_channel
*chan
;
450 struct lttng_event
*event
;
451 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
452 struct lttng_metadata_stream
*stream
;
454 mutex_lock(&sessions_mutex
);
455 if (!session
->active
) {
460 mutex_lock(&cache
->lock
);
461 memset(cache
->data
, 0, cache
->cache_alloc
);
462 cache
->metadata_written
= 0;
464 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
465 stream
->metadata_out
= 0;
466 stream
->metadata_in
= 0;
468 mutex_unlock(&cache
->lock
);
470 session
->metadata_dumped
= 0;
471 list_for_each_entry(chan
, &session
->chan
, list
) {
472 chan
->metadata_dumped
= 0;
475 list_for_each_entry(event
, &session
->events
, list
) {
476 event
->metadata_dumped
= 0;
479 ret
= _lttng_session_metadata_statedump(session
);
482 mutex_unlock(&sessions_mutex
);
486 int lttng_channel_enable(struct lttng_channel
*channel
)
490 mutex_lock(&sessions_mutex
);
491 if (channel
->channel_type
== METADATA_CHANNEL
) {
495 if (channel
->enabled
) {
499 /* Set transient enabler state to "enabled" */
501 lttng_session_sync_event_enablers(channel
->session
);
502 /* Set atomically the state to "enabled" */
503 WRITE_ONCE(channel
->enabled
, 1);
505 mutex_unlock(&sessions_mutex
);
509 int lttng_channel_disable(struct lttng_channel
*channel
)
513 mutex_lock(&sessions_mutex
);
514 if (channel
->channel_type
== METADATA_CHANNEL
) {
518 if (!channel
->enabled
) {
522 /* Set atomically the state to "disabled" */
523 WRITE_ONCE(channel
->enabled
, 0);
524 /* Set transient enabler state to "enabled" */
526 lttng_session_sync_event_enablers(channel
->session
);
528 mutex_unlock(&sessions_mutex
);
532 int lttng_event_enable(struct lttng_event
*event
)
536 mutex_lock(&sessions_mutex
);
537 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
541 if (event
->enabled
) {
545 switch (event
->instrumentation
) {
546 case LTTNG_KERNEL_TRACEPOINT
:
547 case LTTNG_KERNEL_SYSCALL
:
550 case LTTNG_KERNEL_KPROBE
:
551 case LTTNG_KERNEL_UPROBE
:
552 case LTTNG_KERNEL_NOOP
:
553 WRITE_ONCE(event
->enabled
, 1);
555 case LTTNG_KERNEL_KRETPROBE
:
556 ret
= lttng_kretprobes_event_enable_state(event
, 1);
558 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
564 mutex_unlock(&sessions_mutex
);
568 int lttng_event_disable(struct lttng_event
*event
)
572 mutex_lock(&sessions_mutex
);
573 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
577 if (!event
->enabled
) {
581 switch (event
->instrumentation
) {
582 case LTTNG_KERNEL_TRACEPOINT
:
583 case LTTNG_KERNEL_SYSCALL
:
586 case LTTNG_KERNEL_KPROBE
:
587 case LTTNG_KERNEL_UPROBE
:
588 case LTTNG_KERNEL_NOOP
:
589 WRITE_ONCE(event
->enabled
, 0);
591 case LTTNG_KERNEL_KRETPROBE
:
592 ret
= lttng_kretprobes_event_enable_state(event
, 0);
594 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
600 mutex_unlock(&sessions_mutex
);
604 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
608 mutex_lock(&sessions_mutex
);
609 if (event_notifier
->enabled
) {
613 switch (event_notifier
->instrumentation
) {
614 case LTTNG_KERNEL_TRACEPOINT
:
617 case LTTNG_KERNEL_KPROBE
:
618 case LTTNG_KERNEL_UPROBE
:
619 WRITE_ONCE(event_notifier
->enabled
, 1);
621 case LTTNG_KERNEL_SYSCALL
:
622 case LTTNG_KERNEL_FUNCTION
:
623 case LTTNG_KERNEL_NOOP
:
624 case LTTNG_KERNEL_KRETPROBE
:
630 mutex_unlock(&sessions_mutex
);
634 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
638 mutex_lock(&sessions_mutex
);
639 if (!event_notifier
->enabled
) {
643 switch (event_notifier
->instrumentation
) {
644 case LTTNG_KERNEL_TRACEPOINT
:
647 case LTTNG_KERNEL_KPROBE
:
648 case LTTNG_KERNEL_UPROBE
:
649 WRITE_ONCE(event_notifier
->enabled
, 0);
651 case LTTNG_KERNEL_SYSCALL
:
652 case LTTNG_KERNEL_FUNCTION
:
653 case LTTNG_KERNEL_NOOP
:
654 case LTTNG_KERNEL_KRETPROBE
:
660 mutex_unlock(&sessions_mutex
);
664 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
665 const char *transport_name
,
667 size_t subbuf_size
, size_t num_subbuf
,
668 unsigned int switch_timer_interval
,
669 unsigned int read_timer_interval
,
670 enum channel_type channel_type
)
672 struct lttng_channel
*chan
;
673 struct lttng_transport
*transport
= NULL
;
675 mutex_lock(&sessions_mutex
);
676 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
677 goto active
; /* Refuse to add channel to active session */
678 transport
= lttng_transport_find(transport_name
);
680 printk(KERN_WARNING
"LTTng: transport %s not found\n",
684 if (!try_module_get(transport
->owner
)) {
685 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
688 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
691 chan
->session
= session
;
692 chan
->id
= session
->free_chan_id
++;
693 chan
->ops
= &transport
->ops
;
695 * Note: the channel creation op already writes into the packet
696 * headers. Therefore the "chan" information used as input
697 * should be already accessible.
699 chan
->chan
= transport
->ops
.channel_create(transport_name
,
700 chan
, buf_addr
, subbuf_size
, num_subbuf
,
701 switch_timer_interval
, read_timer_interval
);
706 chan
->transport
= transport
;
707 chan
->channel_type
= channel_type
;
708 list_add(&chan
->list
, &session
->chan
);
709 mutex_unlock(&sessions_mutex
);
716 module_put(transport
->owner
);
719 mutex_unlock(&sessions_mutex
);
724 * Only used internally at session destruction for per-cpu channels, and
725 * when metadata channel is released.
726 * Needs to be called with sessions mutex held.
729 void _lttng_channel_destroy(struct lttng_channel
*chan
)
731 chan
->ops
->channel_destroy(chan
->chan
);
732 module_put(chan
->transport
->owner
);
733 list_del(&chan
->list
);
734 lttng_destroy_context(chan
->ctx
);
738 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
740 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
742 /* Protect the metadata cache with the sessions_mutex. */
743 mutex_lock(&sessions_mutex
);
744 _lttng_channel_destroy(chan
);
745 mutex_unlock(&sessions_mutex
);
747 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
750 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
752 stream
->finalized
= 1;
753 wake_up_interruptible(&stream
->read_wait
);
757 * Supports event creation while tracing session is active.
758 * Needs to be called with sessions mutex held.
760 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
761 struct lttng_kernel_event
*event_param
,
763 const struct lttng_event_desc
*event_desc
,
764 enum lttng_kernel_instrumentation itype
)
766 struct lttng_session
*session
= chan
->session
;
767 struct lttng_event
*event
;
768 const char *event_name
;
769 struct hlist_head
*head
;
772 if (chan
->free_event_id
== -1U) {
778 case LTTNG_KERNEL_TRACEPOINT
:
779 event_name
= event_desc
->name
;
781 case LTTNG_KERNEL_KPROBE
:
782 case LTTNG_KERNEL_UPROBE
:
783 case LTTNG_KERNEL_KRETPROBE
:
784 case LTTNG_KERNEL_NOOP
:
785 case LTTNG_KERNEL_SYSCALL
:
786 event_name
= event_param
->name
;
788 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
795 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
796 LTTNG_EVENT_HT_SIZE
, event_name
);
797 lttng_hlist_for_each_entry(event
, head
, hlist
) {
798 WARN_ON_ONCE(!event
->desc
);
799 if (!strncmp(event
->desc
->name
, event_name
,
800 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
801 && chan
== event
->chan
) {
807 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
813 event
->filter
= filter
;
814 event
->id
= chan
->free_event_id
++;
815 event
->instrumentation
= itype
;
816 event
->evtype
= LTTNG_TYPE_EVENT
;
817 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
818 INIT_LIST_HEAD(&event
->enablers_ref_head
);
821 case LTTNG_KERNEL_TRACEPOINT
:
822 /* Event will be enabled by enabler sync. */
824 event
->registered
= 0;
825 event
->desc
= lttng_event_desc_get(event_name
);
830 /* Populate lttng_event structure before event registration. */
833 case LTTNG_KERNEL_KPROBE
:
835 * Needs to be explicitly enabled after creation, since
836 * we may want to apply filters.
839 event
->registered
= 1;
841 * Populate lttng_event structure before event
845 ret
= lttng_kprobes_register_event(event_name
,
846 event_param
->u
.kprobe
.symbol_name
,
847 event_param
->u
.kprobe
.offset
,
848 event_param
->u
.kprobe
.addr
,
854 ret
= try_module_get(event
->desc
->owner
);
857 case LTTNG_KERNEL_KRETPROBE
:
859 struct lttng_event
*event_return
;
861 /* kretprobe defines 2 events */
863 * Needs to be explicitly enabled after creation, since
864 * we may want to apply filters.
867 event
->registered
= 1;
869 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
874 event_return
->chan
= chan
;
875 event_return
->filter
= filter
;
876 event_return
->id
= chan
->free_event_id
++;
877 event_return
->enabled
= 0;
878 event_return
->registered
= 1;
879 event_return
->instrumentation
= itype
;
881 * Populate lttng_event structure before kretprobe registration.
884 ret
= lttng_kretprobes_register(event_name
,
885 event_param
->u
.kretprobe
.symbol_name
,
886 event_param
->u
.kretprobe
.offset
,
887 event_param
->u
.kretprobe
.addr
,
888 event
, event_return
);
890 kmem_cache_free(event_cache
, event_return
);
894 /* Take 2 refs on the module: one per event. */
895 ret
= try_module_get(event
->desc
->owner
);
897 ret
= try_module_get(event
->desc
->owner
);
899 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
901 WARN_ON_ONCE(ret
> 0);
903 kmem_cache_free(event_cache
, event_return
);
904 module_put(event
->desc
->owner
);
905 module_put(event
->desc
->owner
);
906 goto statedump_error
;
908 list_add(&event_return
->list
, &chan
->session
->events
);
911 case LTTNG_KERNEL_NOOP
:
912 case LTTNG_KERNEL_SYSCALL
:
914 * Needs to be explicitly enabled after creation, since
915 * we may want to apply filters.
918 event
->registered
= 0;
919 event
->desc
= event_desc
;
920 switch (event_param
->u
.syscall
.entryexit
) {
921 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
924 case LTTNG_KERNEL_SYSCALL_ENTRY
:
925 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
927 case LTTNG_KERNEL_SYSCALL_EXIT
:
928 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
931 switch (event_param
->u
.syscall
.abi
) {
932 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
935 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
936 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
938 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
939 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
947 case LTTNG_KERNEL_UPROBE
:
949 * Needs to be explicitly enabled after creation, since
950 * we may want to apply filters.
953 event
->registered
= 1;
956 * Populate lttng_event structure before event
961 ret
= lttng_uprobes_register_event(event_param
->name
,
962 event_param
->u
.uprobe
.fd
,
966 ret
= try_module_get(event
->desc
->owner
);
969 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
975 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
976 WARN_ON_ONCE(ret
> 0);
978 goto statedump_error
;
980 hlist_add_head(&event
->hlist
, head
);
981 list_add(&event
->list
, &chan
->session
->events
);
985 /* If a statedump error occurs, events will not be readable. */
987 kmem_cache_free(event_cache
, event
);
995 struct lttng_event_notifier
*_lttng_event_notifier_create(
996 const struct lttng_event_desc
*event_desc
,
997 uint64_t token
, struct lttng_event_notifier_group
*event_notifier_group
,
998 struct lttng_kernel_event_notifier
*event_notifier_param
,
999 void *filter
, enum lttng_kernel_instrumentation itype
)
1001 struct lttng_event_notifier
*event_notifier
;
1002 const char *event_name
;
1003 struct hlist_head
*head
;
1007 case LTTNG_KERNEL_TRACEPOINT
:
1008 event_name
= event_desc
->name
;
1010 case LTTNG_KERNEL_KPROBE
:
1011 case LTTNG_KERNEL_UPROBE
:
1012 event_name
= event_notifier_param
->event
.name
;
1014 case LTTNG_KERNEL_KRETPROBE
:
1015 case LTTNG_KERNEL_FUNCTION
:
1016 case LTTNG_KERNEL_NOOP
:
1017 case LTTNG_KERNEL_SYSCALL
:
1024 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1025 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1026 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1027 WARN_ON_ONCE(!event_notifier
->desc
);
1028 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1029 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1030 && event_notifier_group
== event_notifier
->group
1031 && token
== event_notifier
->user_token
) {
1037 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1038 if (!event_notifier
) {
1043 event_notifier
->group
= event_notifier_group
;
1044 event_notifier
->user_token
= token
;
1045 event_notifier
->filter
= filter
;
1046 event_notifier
->instrumentation
= itype
;
1047 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1048 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1049 INIT_LIST_HEAD(&event_notifier
->bytecode_runtime_head
);
1050 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1053 case LTTNG_KERNEL_TRACEPOINT
:
1054 /* Event will be enabled by enabler sync. */
1055 event_notifier
->enabled
= 0;
1056 event_notifier
->registered
= 0;
1057 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1058 if (!event_notifier
->desc
) {
1060 goto register_error
;
1062 /* Populate lttng_event_notifier structure before event registration. */
1065 case LTTNG_KERNEL_KPROBE
:
1067 * Needs to be explicitly enabled after creation, since
1068 * we may want to apply filters.
1070 event_notifier
->enabled
= 0;
1071 event_notifier
->registered
= 1;
1073 * Populate lttng_event_notifier structure before event
1077 ret
= lttng_kprobes_register_event_notifier(
1078 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1079 event_notifier_param
->event
.u
.kprobe
.offset
,
1080 event_notifier_param
->event
.u
.kprobe
.addr
,
1084 goto register_error
;
1086 ret
= try_module_get(event_notifier
->desc
->owner
);
1089 case LTTNG_KERNEL_UPROBE
:
1091 * Needs to be explicitly enabled after creation, since
1092 * we may want to apply filters.
1094 event_notifier
->enabled
= 0;
1095 event_notifier
->registered
= 1;
1098 * Populate lttng_event_notifier structure before
1099 * event_notifier registration.
1103 ret
= lttng_uprobes_register_event_notifier(
1104 event_notifier_param
->event
.name
,
1105 event_notifier_param
->event
.u
.uprobe
.fd
,
1108 goto register_error
;
1109 ret
= try_module_get(event_notifier
->desc
->owner
);
1112 case LTTNG_KERNEL_KRETPROBE
:
1113 case LTTNG_KERNEL_FUNCTION
:
1114 case LTTNG_KERNEL_NOOP
:
1115 case LTTNG_KERNEL_SYSCALL
:
1119 goto register_error
;
1122 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1123 hlist_add_head(&event_notifier
->hlist
, head
);
1124 return event_notifier
;
1127 kmem_cache_free(event_notifier_cache
, event_notifier
);
1131 return ERR_PTR(ret
);
1134 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1135 struct lttng_kernel_event
*event_param
,
1137 const struct lttng_event_desc
*event_desc
,
1138 enum lttng_kernel_instrumentation itype
)
1140 struct lttng_event
*event
;
1142 mutex_lock(&sessions_mutex
);
1143 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1145 mutex_unlock(&sessions_mutex
);
1149 struct lttng_event_notifier
*lttng_event_notifier_create(
1150 const struct lttng_event_desc
*event_desc
,
1151 uint64_t id
, struct lttng_event_notifier_group
*event_notifier_group
,
1152 struct lttng_kernel_event_notifier
*event_notifier_param
,
1153 void *filter
, enum lttng_kernel_instrumentation itype
)
1155 struct lttng_event_notifier
*event_notifier
;
1157 mutex_lock(&sessions_mutex
);
1158 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1159 event_notifier_group
, event_notifier_param
, filter
, itype
);
1160 mutex_unlock(&sessions_mutex
);
1161 return event_notifier
;
1164 /* Only used for tracepoints for now. */
1166 void register_event(struct lttng_event
*event
)
1168 const struct lttng_event_desc
*desc
;
1171 if (event
->registered
)
1175 switch (event
->instrumentation
) {
1176 case LTTNG_KERNEL_TRACEPOINT
:
1177 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1178 desc
->probe_callback
,
1181 case LTTNG_KERNEL_SYSCALL
:
1182 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1184 case LTTNG_KERNEL_KPROBE
:
1185 case LTTNG_KERNEL_UPROBE
:
1186 case LTTNG_KERNEL_KRETPROBE
:
1187 case LTTNG_KERNEL_NOOP
:
1190 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1195 event
->registered
= 1;
1199 * Only used internally at session destruction.
1201 int _lttng_event_unregister(struct lttng_event
*event
)
1203 const struct lttng_event_desc
*desc
;
1206 if (!event
->registered
)
1210 switch (event
->instrumentation
) {
1211 case LTTNG_KERNEL_TRACEPOINT
:
1212 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1213 event
->desc
->probe_callback
,
1216 case LTTNG_KERNEL_KPROBE
:
1217 lttng_kprobes_unregister_event(event
);
1220 case LTTNG_KERNEL_KRETPROBE
:
1221 lttng_kretprobes_unregister(event
);
1224 case LTTNG_KERNEL_SYSCALL
:
1225 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1227 case LTTNG_KERNEL_NOOP
:
1230 case LTTNG_KERNEL_UPROBE
:
1231 lttng_uprobes_unregister_event(event
);
1234 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1239 event
->registered
= 0;
1243 /* Only used for tracepoints for now. */
1245 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1247 const struct lttng_event_desc
*desc
;
1250 if (event_notifier
->registered
)
1253 desc
= event_notifier
->desc
;
1254 switch (event_notifier
->instrumentation
) {
1255 case LTTNG_KERNEL_TRACEPOINT
:
1256 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1257 desc
->event_notifier_callback
,
1260 case LTTNG_KERNEL_KPROBE
:
1261 case LTTNG_KERNEL_UPROBE
:
1264 case LTTNG_KERNEL_SYSCALL
:
1265 case LTTNG_KERNEL_KRETPROBE
:
1266 case LTTNG_KERNEL_FUNCTION
:
1267 case LTTNG_KERNEL_NOOP
:
1272 event_notifier
->registered
= 1;
1276 int _lttng_event_notifier_unregister(
1277 struct lttng_event_notifier
*event_notifier
)
1279 const struct lttng_event_desc
*desc
;
1282 if (!event_notifier
->registered
)
1285 desc
= event_notifier
->desc
;
1286 switch (event_notifier
->instrumentation
) {
1287 case LTTNG_KERNEL_TRACEPOINT
:
1288 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1289 event_notifier
->desc
->event_notifier_callback
,
1292 case LTTNG_KERNEL_KPROBE
:
1293 lttng_kprobes_unregister_event_notifier(event_notifier
);
1296 case LTTNG_KERNEL_UPROBE
:
1297 lttng_uprobes_unregister_event_notifier(event_notifier
);
1300 case LTTNG_KERNEL_KRETPROBE
:
1301 case LTTNG_KERNEL_FUNCTION
:
1302 case LTTNG_KERNEL_SYSCALL
:
1303 case LTTNG_KERNEL_NOOP
:
1308 event_notifier
->registered
= 0;
1313 * Only used internally at session destruction.
1316 void _lttng_event_destroy(struct lttng_event
*event
)
1318 switch (event
->instrumentation
) {
1319 case LTTNG_KERNEL_TRACEPOINT
:
1320 lttng_event_desc_put(event
->desc
);
1322 case LTTNG_KERNEL_KPROBE
:
1323 module_put(event
->desc
->owner
);
1324 lttng_kprobes_destroy_event_private(event
);
1326 case LTTNG_KERNEL_KRETPROBE
:
1327 module_put(event
->desc
->owner
);
1328 lttng_kretprobes_destroy_private(event
);
1330 case LTTNG_KERNEL_NOOP
:
1331 case LTTNG_KERNEL_SYSCALL
:
1333 case LTTNG_KERNEL_UPROBE
:
1334 module_put(event
->desc
->owner
);
1335 lttng_uprobes_destroy_event_private(event
);
1337 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1341 list_del(&event
->list
);
1342 lttng_destroy_context(event
->ctx
);
1343 kmem_cache_free(event_cache
, event
);
1347 * Only used internally at session destruction.
1350 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1352 switch (event_notifier
->instrumentation
) {
1353 case LTTNG_KERNEL_TRACEPOINT
:
1354 lttng_event_desc_put(event_notifier
->desc
);
1356 case LTTNG_KERNEL_KPROBE
:
1357 module_put(event_notifier
->desc
->owner
);
1358 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1360 case LTTNG_KERNEL_UPROBE
:
1361 module_put(event_notifier
->desc
->owner
);
1362 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1364 case LTTNG_KERNEL_KRETPROBE
:
1365 case LTTNG_KERNEL_FUNCTION
:
1366 case LTTNG_KERNEL_NOOP
:
1367 case LTTNG_KERNEL_SYSCALL
:
1371 list_del(&event_notifier
->list
);
1372 kmem_cache_free(event_notifier_cache
, event_notifier
);
1375 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1376 enum tracker_type tracker_type
)
1378 switch (tracker_type
) {
1380 return &session
->pid_tracker
;
1382 return &session
->vpid_tracker
;
1384 return &session
->uid_tracker
;
1386 return &session
->vuid_tracker
;
1388 return &session
->gid_tracker
;
1390 return &session
->vgid_tracker
;
1397 int lttng_session_track_id(struct lttng_session
*session
,
1398 enum tracker_type tracker_type
, int id
)
1400 struct lttng_id_tracker
*tracker
;
1403 tracker
= get_tracker(session
, tracker_type
);
1408 mutex_lock(&sessions_mutex
);
1410 /* track all ids: destroy tracker. */
1411 lttng_id_tracker_destroy(tracker
, true);
1414 ret
= lttng_id_tracker_add(tracker
, id
);
1416 mutex_unlock(&sessions_mutex
);
1420 int lttng_session_untrack_id(struct lttng_session
*session
,
1421 enum tracker_type tracker_type
, int id
)
1423 struct lttng_id_tracker
*tracker
;
1426 tracker
= get_tracker(session
, tracker_type
);
1431 mutex_lock(&sessions_mutex
);
1433 /* untrack all ids: replace by empty tracker. */
1434 ret
= lttng_id_tracker_empty_set(tracker
);
1436 ret
= lttng_id_tracker_del(tracker
, id
);
1438 mutex_unlock(&sessions_mutex
);
1443 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1445 struct lttng_id_tracker
*id_tracker
= m
->private;
1446 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1447 struct lttng_id_hash_node
*e
;
1450 mutex_lock(&sessions_mutex
);
1452 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1453 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1455 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1461 /* ID tracker disabled. */
1462 if (iter
>= *pos
&& iter
== 0) {
1463 return id_tracker_p
; /* empty tracker */
1471 /* Called with sessions_mutex held. */
1473 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1475 struct lttng_id_tracker
*id_tracker
= m
->private;
1476 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1477 struct lttng_id_hash_node
*e
;
1482 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1483 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1485 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1486 if (iter
++ >= *ppos
)
1491 /* ID tracker disabled. */
1492 if (iter
>= *ppos
&& iter
== 0)
1493 return p
; /* empty tracker */
1502 void id_list_stop(struct seq_file
*m
, void *p
)
1504 mutex_unlock(&sessions_mutex
);
1508 int id_list_show(struct seq_file
*m
, void *p
)
1510 struct lttng_id_tracker
*id_tracker
= m
->private;
1511 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1514 if (p
== id_tracker_p
) {
1515 /* Tracker disabled. */
1518 const struct lttng_id_hash_node
*e
= p
;
1520 id
= lttng_id_tracker_get_node_id(e
);
1522 switch (id_tracker
->tracker_type
) {
1524 seq_printf(m
, "process { pid = %d; };\n", id
);
1527 seq_printf(m
, "process { vpid = %d; };\n", id
);
1530 seq_printf(m
, "user { uid = %d; };\n", id
);
1533 seq_printf(m
, "user { vuid = %d; };\n", id
);
1536 seq_printf(m
, "group { gid = %d; };\n", id
);
1539 seq_printf(m
, "group { vgid = %d; };\n", id
);
1542 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1548 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1549 .start
= id_list_start
,
1550 .next
= id_list_next
,
1551 .stop
= id_list_stop
,
1552 .show
= id_list_show
,
1556 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1558 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1562 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1564 struct seq_file
*m
= file
->private_data
;
1565 struct lttng_id_tracker
*id_tracker
= m
->private;
1568 WARN_ON_ONCE(!id_tracker
);
1569 ret
= seq_release(inode
, file
);
1571 fput(id_tracker
->session
->file
);
1575 const struct file_operations lttng_tracker_ids_list_fops
= {
1576 .owner
= THIS_MODULE
,
1577 .open
= lttng_tracker_ids_list_open
,
1579 .llseek
= seq_lseek
,
1580 .release
= lttng_tracker_ids_list_release
,
1583 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1584 enum tracker_type tracker_type
)
1586 struct file
*tracker_ids_list_file
;
1590 file_fd
= lttng_get_unused_fd();
1596 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1597 <tng_tracker_ids_list_fops
,
1599 if (IS_ERR(tracker_ids_list_file
)) {
1600 ret
= PTR_ERR(tracker_ids_list_file
);
1603 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1605 goto refcount_error
;
1607 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1610 m
= tracker_ids_list_file
->private_data
;
1612 m
->private = get_tracker(session
, tracker_type
);
1613 BUG_ON(!m
->private);
1614 fd_install(file_fd
, tracker_ids_list_file
);
1619 atomic_long_dec(&session
->file
->f_count
);
1621 fput(tracker_ids_list_file
);
1623 put_unused_fd(file_fd
);
1629 * Enabler management.
1632 int lttng_match_enabler_star_glob(const char *desc_name
,
1633 const char *pattern
)
1635 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1636 desc_name
, LTTNG_SIZE_MAX
))
1642 int lttng_match_enabler_name(const char *desc_name
,
1645 if (strcmp(desc_name
, name
))
1651 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1652 struct lttng_enabler
*enabler
)
1654 const char *desc_name
, *enabler_name
;
1655 bool compat
= false, entry
= false;
1657 enabler_name
= enabler
->event_param
.name
;
1658 switch (enabler
->event_param
.instrumentation
) {
1659 case LTTNG_KERNEL_TRACEPOINT
:
1660 desc_name
= desc
->name
;
1661 switch (enabler
->format_type
) {
1662 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1663 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1664 case LTTNG_ENABLER_FORMAT_NAME
:
1665 return lttng_match_enabler_name(desc_name
, enabler_name
);
1670 case LTTNG_KERNEL_SYSCALL
:
1671 desc_name
= desc
->name
;
1672 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1673 desc_name
+= strlen("compat_");
1676 if (!strncmp(desc_name
, "syscall_exit_",
1677 strlen("syscall_exit_"))) {
1678 desc_name
+= strlen("syscall_exit_");
1679 } else if (!strncmp(desc_name
, "syscall_entry_",
1680 strlen("syscall_entry_"))) {
1681 desc_name
+= strlen("syscall_entry_");
1687 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1688 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1690 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1694 case LTTNG_KERNEL_SYSCALL_EXIT
:
1701 switch (enabler
->event_param
.u
.syscall
.abi
) {
1702 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1704 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1708 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1715 switch (enabler
->event_param
.u
.syscall
.match
) {
1716 case LTTNG_SYSCALL_MATCH_NAME
:
1717 switch (enabler
->format_type
) {
1718 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1719 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1720 case LTTNG_ENABLER_FORMAT_NAME
:
1721 return lttng_match_enabler_name(desc_name
, enabler_name
);
1726 case LTTNG_SYSCALL_MATCH_NR
:
1727 return -EINVAL
; /* Not implemented. */
1739 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1740 struct lttng_event
*event
)
1742 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1745 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1747 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1748 && event
->chan
== event_enabler
->chan
)
1755 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1756 struct lttng_event_notifier
*event_notifier
)
1758 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1759 event_notifier_enabler
);
1761 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
1763 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
1764 && event_notifier
->group
== event_notifier_enabler
->group
1765 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1772 struct lttng_enabler_ref
*lttng_enabler_ref(
1773 struct list_head
*enablers_ref_list
,
1774 struct lttng_enabler
*enabler
)
1776 struct lttng_enabler_ref
*enabler_ref
;
1778 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
1779 if (enabler_ref
->ref
== enabler
)
1786 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1788 struct lttng_session
*session
= event_enabler
->chan
->session
;
1789 struct lttng_probe_desc
*probe_desc
;
1790 const struct lttng_event_desc
*desc
;
1792 struct list_head
*probe_list
;
1794 probe_list
= lttng_get_probe_list_head();
1796 * For each probe event, if we find that a probe event matches
1797 * our enabler, create an associated lttng_event if not
1800 list_for_each_entry(probe_desc
, probe_list
, head
) {
1801 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1803 struct hlist_head
*head
;
1804 struct lttng_event
*event
;
1806 desc
= probe_desc
->event_desc
[i
];
1807 if (!lttng_desc_match_enabler(desc
,
1808 lttng_event_enabler_as_enabler(event_enabler
)))
1812 * Check if already created.
1814 head
= utils_borrow_hash_table_bucket(
1815 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
1817 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1818 if (event
->desc
== desc
1819 && event
->chan
== event_enabler
->chan
)
1826 * We need to create an event for this
1829 event
= _lttng_event_create(event_enabler
->chan
,
1831 LTTNG_KERNEL_TRACEPOINT
);
1833 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
1834 probe_desc
->event_desc
[i
]->name
);
1841 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1843 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1844 struct lttng_probe_desc
*probe_desc
;
1845 const struct lttng_event_desc
*desc
;
1847 struct list_head
*probe_list
;
1849 probe_list
= lttng_get_probe_list_head();
1851 * For each probe event, if we find that a probe event matches
1852 * our enabler, create an associated lttng_event_notifier if not
1855 list_for_each_entry(probe_desc
, probe_list
, head
) {
1856 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1858 struct hlist_head
*head
;
1859 struct lttng_event_notifier
*event_notifier
;
1861 desc
= probe_desc
->event_desc
[i
];
1862 if (!lttng_desc_match_enabler(desc
,
1863 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1867 * Check if already created.
1869 head
= utils_borrow_hash_table_bucket(
1870 event_notifier_group
->event_notifiers_ht
.table
,
1871 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
1872 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1873 if (event_notifier
->desc
== desc
1874 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1881 * We need to create a event_notifier for this event probe.
1883 event_notifier
= _lttng_event_notifier_create(desc
,
1884 event_notifier_enabler
->base
.user_token
,
1885 event_notifier_group
, NULL
, NULL
,
1886 LTTNG_KERNEL_TRACEPOINT
);
1887 if (IS_ERR(event_notifier
)) {
1888 printk(KERN_INFO
"Unable to create event_notifier %s\n",
1889 probe_desc
->event_desc
[i
]->name
);
1896 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1900 ret
= lttng_syscalls_register_event(event_enabler
->chan
, NULL
);
1905 * Create struct lttng_event if it is missing and present in the list of
1906 * tracepoint probes.
1907 * Should be called with sessions mutex held.
1910 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1912 switch (event_enabler
->base
.event_param
.instrumentation
) {
1913 case LTTNG_KERNEL_TRACEPOINT
:
1914 lttng_create_tracepoint_event_if_missing(event_enabler
);
1916 case LTTNG_KERNEL_SYSCALL
:
1917 lttng_create_syscall_event_if_missing(event_enabler
);
1926 * Create events associated with an event_enabler (if not already present),
1927 * and add backward reference from the event to the enabler.
1928 * Should be called with sessions mutex held.
1931 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1933 struct lttng_channel
*chan
= event_enabler
->chan
;
1934 struct lttng_session
*session
= event_enabler
->chan
->session
;
1935 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
1936 struct lttng_event
*event
;
1938 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
1939 base_enabler
->event_param
.u
.syscall
.entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
&&
1940 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
1941 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_SYSCALL_MATCH_NAME
&&
1942 !strcmp(base_enabler
->event_param
.name
, "*")) {
1943 if (base_enabler
->enabled
)
1944 WRITE_ONCE(chan
->syscall_all
, 1);
1946 WRITE_ONCE(chan
->syscall_all
, 0);
1949 /* First ensure that probe events are created for this enabler. */
1950 lttng_create_event_if_missing(event_enabler
);
1952 /* For each event matching event_enabler in session event list. */
1953 list_for_each_entry(event
, &session
->events
, list
) {
1954 struct lttng_enabler_ref
*enabler_ref
;
1956 if (!lttng_event_enabler_match_event(event_enabler
, event
))
1958 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
1959 lttng_event_enabler_as_enabler(event_enabler
));
1962 * If no backward ref, create it.
1963 * Add backward ref from event to event_enabler.
1965 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1968 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
1969 list_add(&enabler_ref
->node
,
1970 &event
->enablers_ref_head
);
1974 * Link filter bytecodes if not linked yet.
1976 lttng_enabler_link_bytecode(event
->desc
,
1978 &event
->bytecode_runtime_head
,
1979 lttng_event_enabler_as_enabler(event_enabler
));
1981 /* TODO: merge event context. */
1987 * Create struct lttng_event_notifier if it is missing and present in the list of
1988 * tracepoint probes.
1989 * Should be called with sessions mutex held.
1992 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1994 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
1995 case LTTNG_KERNEL_TRACEPOINT
:
1996 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2005 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2008 int lttng_event_notifier_enabler_ref_event_notifiers(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2010 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2011 struct lttng_event_notifier
*event_notifier
;
2013 /* First ensure that probe event_notifiers are created for this enabler. */
2014 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2016 /* Link the created event_notifier with its associated enabler. */
2017 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2018 struct lttng_enabler_ref
*enabler_ref
;
2020 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2023 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2024 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2027 * If no backward ref, create it.
2028 * Add backward ref from event_notifier to enabler.
2030 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2034 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2035 event_notifier_enabler
);
2036 list_add(&enabler_ref
->node
,
2037 &event_notifier
->enablers_ref_head
);
2041 * Link filter bytecodes if not linked yet.
2043 lttng_enabler_link_bytecode(event_notifier
->desc
,
2044 lttng_static_ctx
, &event_notifier
->bytecode_runtime_head
,
2045 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2051 * Called at module load: connect the probe on all enablers matching
2053 * Called with sessions lock held.
2055 int lttng_fix_pending_events(void)
2057 struct lttng_session
*session
;
2059 list_for_each_entry(session
, &sessions
, list
)
2060 lttng_session_lazy_sync_event_enablers(session
);
2064 static bool lttng_event_notifier_group_has_active_event_notifiers(
2065 struct lttng_event_notifier_group
*event_notifier_group
)
2067 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2069 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2071 if (event_notifier_enabler
->base
.enabled
)
2077 bool lttng_event_notifier_active(void)
2079 struct lttng_event_notifier_group
*event_notifier_group
;
2081 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2082 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2088 int lttng_fix_pending_event_notifiers(void)
2090 struct lttng_event_notifier_group
*event_notifier_group
;
2092 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2093 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2097 struct lttng_event_enabler
*lttng_event_enabler_create(
2098 enum lttng_enabler_format_type format_type
,
2099 struct lttng_kernel_event
*event_param
,
2100 struct lttng_channel
*chan
)
2102 struct lttng_event_enabler
*event_enabler
;
2104 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2107 event_enabler
->base
.format_type
= format_type
;
2108 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2109 memcpy(&event_enabler
->base
.event_param
, event_param
,
2110 sizeof(event_enabler
->base
.event_param
));
2111 event_enabler
->chan
= chan
;
2113 event_enabler
->base
.enabled
= 0;
2114 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2115 mutex_lock(&sessions_mutex
);
2116 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2117 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2118 mutex_unlock(&sessions_mutex
);
2119 return event_enabler
;
2122 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2124 mutex_lock(&sessions_mutex
);
2125 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2126 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2127 mutex_unlock(&sessions_mutex
);
2131 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2133 mutex_lock(&sessions_mutex
);
2134 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2135 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2136 mutex_unlock(&sessions_mutex
);
2141 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
2142 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2144 struct lttng_filter_bytecode_node
*bytecode_node
;
2145 uint32_t bytecode_len
;
2148 ret
= get_user(bytecode_len
, &bytecode
->len
);
2151 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2155 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2156 sizeof(*bytecode
) + bytecode_len
);
2160 bytecode_node
->enabler
= enabler
;
2161 /* Enforce length based on allocated size */
2162 bytecode_node
->bc
.len
= bytecode_len
;
2163 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2168 kfree(bytecode_node
);
2172 int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler
*event_enabler
,
2173 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2176 ret
= lttng_enabler_attach_bytecode(
2177 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2181 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2188 int lttng_event_add_callsite(struct lttng_event
*event
,
2189 struct lttng_kernel_event_callsite __user
*callsite
)
2192 switch (event
->instrumentation
) {
2193 case LTTNG_KERNEL_UPROBE
:
2194 return lttng_uprobes_event_add_callsite(event
, callsite
);
2200 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2201 struct lttng_kernel_context
*context_param
)
2207 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2209 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
2211 /* Destroy filter bytecode */
2212 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2213 &enabler
->filter_bytecode_head
, node
) {
2219 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2221 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2223 /* Destroy contexts */
2224 lttng_destroy_context(event_enabler
->ctx
);
2226 list_del(&event_enabler
->node
);
2227 kfree(event_enabler
);
2230 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2231 struct lttng_event_notifier_group
*event_notifier_group
,
2232 enum lttng_enabler_format_type format_type
,
2233 struct lttng_kernel_event_notifier
*event_notifier_param
)
2235 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2237 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2238 if (!event_notifier_enabler
)
2241 event_notifier_enabler
->base
.format_type
= format_type
;
2242 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2244 memcpy(&event_notifier_enabler
->base
.event_param
.name
, event_notifier_param
->event
.name
,
2245 sizeof(event_notifier_enabler
->base
.event_param
.name
));
2246 event_notifier_enabler
->base
.event_param
.instrumentation
= event_notifier_param
->event
.instrumentation
;
2247 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2249 event_notifier_enabler
->base
.enabled
= 0;
2250 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2251 event_notifier_enabler
->group
= event_notifier_group
;
2253 mutex_lock(&sessions_mutex
);
2254 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2255 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2257 mutex_unlock(&sessions_mutex
);
2259 return event_notifier_enabler
;
2262 int lttng_event_notifier_enabler_enable(
2263 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2265 mutex_lock(&sessions_mutex
);
2266 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2267 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2268 mutex_unlock(&sessions_mutex
);
2272 int lttng_event_notifier_enabler_disable(
2273 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2275 mutex_lock(&sessions_mutex
);
2276 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2277 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2278 mutex_unlock(&sessions_mutex
);
2282 int lttng_event_notifier_enabler_attach_bytecode(
2283 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2284 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2288 ret
= lttng_enabler_attach_bytecode(
2289 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2294 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2301 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2302 struct lttng_kernel_event_callsite __user
*callsite
)
2305 switch (event_notifier
->instrumentation
) {
2306 case LTTNG_KERNEL_UPROBE
:
2307 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2314 int lttng_event_notifier_enabler_attach_context(
2315 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2316 struct lttng_kernel_context
*context_param
)
2322 void lttng_event_notifier_enabler_destroy(
2323 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2325 if (!event_notifier_enabler
) {
2329 list_del(&event_notifier_enabler
->node
);
2331 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2332 kfree(event_notifier_enabler
);
2336 * lttng_session_sync_event_enablers should be called just before starting a
2338 * Should be called with sessions mutex held.
2341 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2343 struct lttng_event_enabler
*event_enabler
;
2344 struct lttng_event
*event
;
2346 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2347 lttng_event_enabler_ref_events(event_enabler
);
2349 * For each event, if at least one of its enablers is enabled,
2350 * and its channel and session transient states are enabled, we
2351 * enable the event, else we disable it.
2353 list_for_each_entry(event
, &session
->events
, list
) {
2354 struct lttng_enabler_ref
*enabler_ref
;
2355 struct lttng_bytecode_runtime
*runtime
;
2356 int enabled
= 0, has_enablers_without_bytecode
= 0;
2358 switch (event
->instrumentation
) {
2359 case LTTNG_KERNEL_TRACEPOINT
:
2360 case LTTNG_KERNEL_SYSCALL
:
2362 list_for_each_entry(enabler_ref
,
2363 &event
->enablers_ref_head
, node
) {
2364 if (enabler_ref
->ref
->enabled
) {
2371 /* Not handled with lazy sync. */
2375 * Enabled state is based on union of enablers, with
2376 * intesection of session and channel transient enable
2379 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2381 WRITE_ONCE(event
->enabled
, enabled
);
2383 * Sync tracepoint registration with event enabled
2387 register_event(event
);
2389 _lttng_event_unregister(event
);
2392 /* Check if has enablers without bytecode enabled */
2393 list_for_each_entry(enabler_ref
,
2394 &event
->enablers_ref_head
, node
) {
2395 if (enabler_ref
->ref
->enabled
2396 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2397 has_enablers_without_bytecode
= 1;
2401 event
->has_enablers_without_bytecode
=
2402 has_enablers_without_bytecode
;
2404 /* Enable filters */
2405 list_for_each_entry(runtime
,
2406 &event
->bytecode_runtime_head
, node
)
2407 lttng_filter_sync_state(runtime
);
2412 * Apply enablers to session events, adding events to session if need
2413 * be. It is required after each modification applied to an active
2414 * session, and right before session "start".
2415 * "lazy" sync means we only sync if required.
2416 * Should be called with sessions mutex held.
2419 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2421 /* We can skip if session is not active */
2422 if (!session
->active
)
2424 lttng_session_sync_event_enablers(session
);
2428 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2430 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2431 struct lttng_event_notifier
*event_notifier
;
2433 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2434 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2437 * For each event_notifier, if at least one of its enablers is enabled,
2438 * we enable the event_notifier, else we disable it.
2440 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2441 struct lttng_enabler_ref
*enabler_ref
;
2442 struct lttng_bytecode_runtime
*runtime
;
2443 int enabled
= 0, has_enablers_without_bytecode
= 0;
2445 switch (event_notifier
->instrumentation
) {
2446 case LTTNG_KERNEL_TRACEPOINT
:
2447 case LTTNG_KERNEL_SYSCALL
:
2448 /* Enable event_notifiers */
2449 list_for_each_entry(enabler_ref
,
2450 &event_notifier
->enablers_ref_head
, node
) {
2451 if (enabler_ref
->ref
->enabled
) {
2458 /* Not handled with sync. */
2462 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2464 * Sync tracepoint registration with event_notifier enabled
2468 if (!event_notifier
->registered
)
2469 register_event_notifier(event_notifier
);
2471 if (event_notifier
->registered
)
2472 _lttng_event_notifier_unregister(event_notifier
);
2475 /* Check if has enablers without bytecode enabled */
2476 list_for_each_entry(enabler_ref
,
2477 &event_notifier
->enablers_ref_head
, node
) {
2478 if (enabler_ref
->ref
->enabled
2479 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2480 has_enablers_without_bytecode
= 1;
2484 event_notifier
->has_enablers_without_bytecode
=
2485 has_enablers_without_bytecode
;
2487 /* Enable filters */
2488 list_for_each_entry(runtime
,
2489 &event_notifier
->bytecode_runtime_head
, node
)
2490 lttng_filter_sync_state(runtime
);
2495 * Serialize at most one packet worth of metadata into a metadata
2497 * We grab the metadata cache mutex to get exclusive access to our metadata
2498 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2499 * allows us to do racy operations such as looking for remaining space left in
2500 * packet and write, since mutual exclusion protects us from concurrent writes.
2501 * Mutual exclusion on the metadata cache allow us to read the cache content
2502 * without racing against reallocation of the cache by updates.
2503 * Returns the number of bytes written in the channel, 0 if no data
2504 * was written and a negative value on error.
2506 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2507 struct channel
*chan
, bool *coherent
)
2509 struct lib_ring_buffer_ctx ctx
;
2511 size_t len
, reserve_len
;
2514 * Ensure we support mutiple get_next / put sequences followed by
2515 * put_next. The metadata cache lock protects reading the metadata
2516 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2517 * "flush" operations on the buffer invoked by different processes.
2518 * Moreover, since the metadata cache memory can be reallocated, we
2519 * need to have exclusive access against updates even though we only
2522 mutex_lock(&stream
->metadata_cache
->lock
);
2523 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2524 if (stream
->metadata_in
!= stream
->metadata_out
)
2527 /* Metadata regenerated, change the version. */
2528 if (stream
->metadata_cache
->version
!= stream
->version
)
2529 stream
->version
= stream
->metadata_cache
->version
;
2531 len
= stream
->metadata_cache
->metadata_written
-
2532 stream
->metadata_in
;
2535 reserve_len
= min_t(size_t,
2536 stream
->transport
->ops
.packet_avail_size(chan
),
2538 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2541 * If reservation failed, return an error to the caller.
2543 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2545 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2546 stream
->coherent
= false;
2549 stream
->transport
->ops
.event_write(&ctx
,
2550 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2552 stream
->transport
->ops
.event_commit(&ctx
);
2553 stream
->metadata_in
+= reserve_len
;
2554 if (reserve_len
< len
)
2555 stream
->coherent
= false;
2557 stream
->coherent
= true;
2562 *coherent
= stream
->coherent
;
2563 mutex_unlock(&stream
->metadata_cache
->lock
);
2568 void lttng_metadata_begin(struct lttng_session
*session
)
2570 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2571 mutex_lock(&session
->metadata_cache
->lock
);
2575 void lttng_metadata_end(struct lttng_session
*session
)
2577 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2578 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2579 struct lttng_metadata_stream
*stream
;
2581 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2582 wake_up_interruptible(&stream
->read_wait
);
2583 mutex_unlock(&session
->metadata_cache
->lock
);
2588 * Write the metadata to the metadata cache.
2589 * Must be called with sessions_mutex held.
2590 * The metadata cache lock protects us from concurrent read access from
2591 * thread outputting metadata content to ring buffer.
2592 * The content of the printf is printed as a single atomic metadata
2595 int lttng_metadata_printf(struct lttng_session
*session
,
2596 const char *fmt
, ...)
2602 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2605 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2611 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2612 if (session
->metadata_cache
->metadata_written
+ len
>
2613 session
->metadata_cache
->cache_alloc
) {
2614 char *tmp_cache_realloc
;
2615 unsigned int tmp_cache_alloc_size
;
2617 tmp_cache_alloc_size
= max_t(unsigned int,
2618 session
->metadata_cache
->cache_alloc
+ len
,
2619 session
->metadata_cache
->cache_alloc
<< 1);
2620 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2621 if (!tmp_cache_realloc
)
2623 if (session
->metadata_cache
->data
) {
2624 memcpy(tmp_cache_realloc
,
2625 session
->metadata_cache
->data
,
2626 session
->metadata_cache
->cache_alloc
);
2627 vfree(session
->metadata_cache
->data
);
2630 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2631 session
->metadata_cache
->data
= tmp_cache_realloc
;
2633 memcpy(session
->metadata_cache
->data
+
2634 session
->metadata_cache
->metadata_written
,
2636 session
->metadata_cache
->metadata_written
+= len
;
2647 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2651 for (i
= 0; i
< nesting
; i
++) {
2654 ret
= lttng_metadata_printf(session
, " ");
2663 int lttng_field_name_statedump(struct lttng_session
*session
,
2664 const struct lttng_event_field
*field
,
2667 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2671 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2672 const struct lttng_type
*type
,
2677 WARN_ON_ONCE(type
->atype
!= atype_integer
);
2678 ret
= print_tabs(session
, nesting
);
2681 ret
= lttng_metadata_printf(session
,
2682 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2683 type
->u
.integer
.size
,
2684 type
->u
.integer
.alignment
,
2685 type
->u
.integer
.signedness
,
2686 (type
->u
.integer
.encoding
== lttng_encode_none
)
2688 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
2691 type
->u
.integer
.base
,
2692 #if __BYTE_ORDER == __BIG_ENDIAN
2693 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
2695 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
2702 * Must be called with sessions_mutex held.
2705 int _lttng_struct_type_statedump(struct lttng_session
*session
,
2706 const struct lttng_type
*type
,
2710 uint32_t i
, nr_fields
;
2711 unsigned int alignment
;
2713 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
2715 ret
= print_tabs(session
, nesting
);
2718 ret
= lttng_metadata_printf(session
,
2722 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
2723 for (i
= 0; i
< nr_fields
; i
++) {
2724 const struct lttng_event_field
*iter_field
;
2726 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
2727 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2731 ret
= print_tabs(session
, nesting
);
2734 alignment
= type
->u
.struct_nestable
.alignment
;
2736 ret
= lttng_metadata_printf(session
,
2740 ret
= lttng_metadata_printf(session
,
2747 * Must be called with sessions_mutex held.
2750 int _lttng_struct_field_statedump(struct lttng_session
*session
,
2751 const struct lttng_event_field
*field
,
2756 ret
= _lttng_struct_type_statedump(session
,
2757 &field
->type
, nesting
);
2760 return lttng_field_name_statedump(session
, field
, nesting
);
2764 * Must be called with sessions_mutex held.
2767 int _lttng_variant_type_statedump(struct lttng_session
*session
,
2768 const struct lttng_type
*type
,
2772 uint32_t i
, nr_choices
;
2774 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
2776 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2778 if (type
->u
.variant_nestable
.alignment
!= 0)
2780 ret
= print_tabs(session
, nesting
);
2783 ret
= lttng_metadata_printf(session
,
2784 "variant <_%s> {\n",
2785 type
->u
.variant_nestable
.tag_name
);
2788 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
2789 for (i
= 0; i
< nr_choices
; i
++) {
2790 const struct lttng_event_field
*iter_field
;
2792 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
2793 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2797 ret
= print_tabs(session
, nesting
);
2800 ret
= lttng_metadata_printf(session
,
2806 * Must be called with sessions_mutex held.
2809 int _lttng_variant_field_statedump(struct lttng_session
*session
,
2810 const struct lttng_event_field
*field
,
2815 ret
= _lttng_variant_type_statedump(session
,
2816 &field
->type
, nesting
);
2819 return lttng_field_name_statedump(session
, field
, nesting
);
2823 * Must be called with sessions_mutex held.
2826 int _lttng_array_field_statedump(struct lttng_session
*session
,
2827 const struct lttng_event_field
*field
,
2831 const struct lttng_type
*elem_type
;
2833 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
2835 if (field
->type
.u
.array_nestable
.alignment
) {
2836 ret
= print_tabs(session
, nesting
);
2839 ret
= lttng_metadata_printf(session
,
2840 "struct { } align(%u) _%s_padding;\n",
2841 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
2847 * Nested compound types: Only array of structures and variants are
2848 * currently supported.
2850 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
2851 switch (elem_type
->atype
) {
2853 case atype_struct_nestable
:
2854 case atype_variant_nestable
:
2855 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2863 ret
= lttng_metadata_printf(session
,
2866 field
->type
.u
.array_nestable
.length
);
2871 * Must be called with sessions_mutex held.
2874 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
2875 const struct lttng_event_field
*field
,
2879 const char *length_name
;
2880 const struct lttng_type
*elem_type
;
2882 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
2884 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
2886 if (field
->type
.u
.sequence_nestable
.alignment
) {
2887 ret
= print_tabs(session
, nesting
);
2890 ret
= lttng_metadata_printf(session
,
2891 "struct { } align(%u) _%s_padding;\n",
2892 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
2899 * Nested compound types: Only array of structures and variants are
2900 * currently supported.
2902 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
2903 switch (elem_type
->atype
) {
2905 case atype_struct_nestable
:
2906 case atype_variant_nestable
:
2907 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2915 ret
= lttng_metadata_printf(session
,
2918 field
->type
.u
.sequence_nestable
.length_name
);
2923 * Must be called with sessions_mutex held.
2926 int _lttng_enum_type_statedump(struct lttng_session
*session
,
2927 const struct lttng_type
*type
,
2930 const struct lttng_enum_desc
*enum_desc
;
2931 const struct lttng_type
*container_type
;
2933 unsigned int i
, nr_entries
;
2935 container_type
= type
->u
.enum_nestable
.container_type
;
2936 if (container_type
->atype
!= atype_integer
) {
2940 enum_desc
= type
->u
.enum_nestable
.desc
;
2941 nr_entries
= enum_desc
->nr_entries
;
2943 ret
= print_tabs(session
, nesting
);
2946 ret
= lttng_metadata_printf(session
, "enum : ");
2949 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
2952 ret
= lttng_metadata_printf(session
, " {\n");
2955 /* Dump all entries */
2956 for (i
= 0; i
< nr_entries
; i
++) {
2957 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
2960 ret
= print_tabs(session
, nesting
+ 1);
2963 ret
= lttng_metadata_printf(session
,
2967 len
= strlen(entry
->string
);
2968 /* Escape the character '"' */
2969 for (j
= 0; j
< len
; j
++) {
2970 char c
= entry
->string
[j
];
2974 ret
= lttng_metadata_printf(session
,
2978 ret
= lttng_metadata_printf(session
,
2982 ret
= lttng_metadata_printf(session
,
2989 ret
= lttng_metadata_printf(session
, "\"");
2993 if (entry
->options
.is_auto
) {
2994 ret
= lttng_metadata_printf(session
, ",\n");
2998 ret
= lttng_metadata_printf(session
,
3002 if (entry
->start
.signedness
)
3003 ret
= lttng_metadata_printf(session
,
3004 "%lld", (long long) entry
->start
.value
);
3006 ret
= lttng_metadata_printf(session
,
3007 "%llu", entry
->start
.value
);
3010 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3012 == entry
->end
.value
) {
3013 ret
= lttng_metadata_printf(session
,
3016 if (entry
->end
.signedness
) {
3017 ret
= lttng_metadata_printf(session
,
3019 (long long) entry
->end
.value
);
3021 ret
= lttng_metadata_printf(session
,
3030 ret
= print_tabs(session
, nesting
);
3033 ret
= lttng_metadata_printf(session
, "}");
3039 * Must be called with sessions_mutex held.
3042 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3043 const struct lttng_event_field
*field
,
3048 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3051 return lttng_field_name_statedump(session
, field
, nesting
);
3055 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3056 const struct lttng_event_field
*field
,
3061 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3064 return lttng_field_name_statedump(session
, field
, nesting
);
3068 int _lttng_string_type_statedump(struct lttng_session
*session
,
3069 const struct lttng_type
*type
,
3074 WARN_ON_ONCE(type
->atype
!= atype_string
);
3075 /* Default encoding is UTF8 */
3076 ret
= print_tabs(session
, nesting
);
3079 ret
= lttng_metadata_printf(session
,
3081 type
->u
.string
.encoding
== lttng_encode_ASCII
?
3082 " { encoding = ASCII; }" : "");
3087 int _lttng_string_field_statedump(struct lttng_session
*session
,
3088 const struct lttng_event_field
*field
,
3093 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
3094 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3097 return lttng_field_name_statedump(session
, field
, nesting
);
3101 * Must be called with sessions_mutex held.
3104 int _lttng_type_statedump(struct lttng_session
*session
,
3105 const struct lttng_type
*type
,
3110 switch (type
->atype
) {
3112 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3114 case atype_enum_nestable
:
3115 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3118 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3120 case atype_struct_nestable
:
3121 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3123 case atype_variant_nestable
:
3124 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3127 /* Nested arrays and sequences are not supported yet. */
3128 case atype_array_nestable
:
3129 case atype_sequence_nestable
:
3138 * Must be called with sessions_mutex held.
3141 int _lttng_field_statedump(struct lttng_session
*session
,
3142 const struct lttng_event_field
*field
,
3147 switch (field
->type
.atype
) {
3149 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3151 case atype_enum_nestable
:
3152 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3155 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3157 case atype_struct_nestable
:
3158 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3160 case atype_array_nestable
:
3161 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3163 case atype_sequence_nestable
:
3164 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3166 case atype_variant_nestable
:
3167 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3178 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3179 struct lttng_ctx
*ctx
)
3186 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3187 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3189 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3197 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3198 struct lttng_event
*event
)
3200 const struct lttng_event_desc
*desc
= event
->desc
;
3204 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3205 const struct lttng_event_field
*field
= &desc
->fields
[i
];
3207 ret
= _lttng_field_statedump(session
, field
, 2);
3215 * Must be called with sessions_mutex held.
3216 * The entire event metadata is printed as a single atomic metadata
3220 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3221 struct lttng_channel
*chan
,
3222 struct lttng_event
*event
)
3226 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3228 if (chan
->channel_type
== METADATA_CHANNEL
)
3231 lttng_metadata_begin(session
);
3233 ret
= lttng_metadata_printf(session
,
3237 " stream_id = %u;\n",
3245 ret
= lttng_metadata_printf(session
,
3246 " context := struct {\n");
3250 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3254 ret
= lttng_metadata_printf(session
,
3260 ret
= lttng_metadata_printf(session
,
3261 " fields := struct {\n"
3266 ret
= _lttng_fields_metadata_statedump(session
, event
);
3271 * LTTng space reservation can only reserve multiples of the
3274 ret
= lttng_metadata_printf(session
,
3280 event
->metadata_dumped
= 1;
3282 lttng_metadata_end(session
);
3288 * Must be called with sessions_mutex held.
3289 * The entire channel metadata is printed as a single atomic metadata
3293 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3294 struct lttng_channel
*chan
)
3298 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3301 if (chan
->channel_type
== METADATA_CHANNEL
)
3304 lttng_metadata_begin(session
);
3306 WARN_ON_ONCE(!chan
->header_type
);
3307 ret
= lttng_metadata_printf(session
,
3310 " event.header := %s;\n"
3311 " packet.context := struct packet_context;\n",
3313 chan
->header_type
== 1 ? "struct event_header_compact" :
3314 "struct event_header_large");
3319 ret
= lttng_metadata_printf(session
,
3320 " event.context := struct {\n");
3324 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3328 ret
= lttng_metadata_printf(session
,
3334 ret
= lttng_metadata_printf(session
,
3337 chan
->metadata_dumped
= 1;
3339 lttng_metadata_end(session
);
3344 * Must be called with sessions_mutex held.
3347 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3349 return lttng_metadata_printf(session
,
3350 "struct packet_context {\n"
3351 " uint64_clock_monotonic_t timestamp_begin;\n"
3352 " uint64_clock_monotonic_t timestamp_end;\n"
3353 " uint64_t content_size;\n"
3354 " uint64_t packet_size;\n"
3355 " uint64_t packet_seq_num;\n"
3356 " unsigned long events_discarded;\n"
3357 " uint32_t cpu_id;\n"
3364 * id: range: 0 - 30.
3365 * id 31 is reserved to indicate an extended header.
3368 * id: range: 0 - 65534.
3369 * id 65535 is reserved to indicate an extended header.
3371 * Must be called with sessions_mutex held.
3374 int _lttng_event_header_declare(struct lttng_session
*session
)
3376 return lttng_metadata_printf(session
,
3377 "struct event_header_compact {\n"
3378 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3381 " uint27_clock_monotonic_t timestamp;\n"
3385 " uint64_clock_monotonic_t timestamp;\n"
3390 "struct event_header_large {\n"
3391 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3394 " uint32_clock_monotonic_t timestamp;\n"
3398 " uint64_clock_monotonic_t timestamp;\n"
3402 lttng_alignof(uint32_t) * CHAR_BIT
,
3403 lttng_alignof(uint16_t) * CHAR_BIT
3408 * Approximation of NTP time of day to clock monotonic correlation,
3409 * taken at start of trace.
3410 * Yes, this is only an approximation. Yes, we can (and will) do better
3411 * in future versions.
3412 * This function may return a negative offset. It may happen if the
3413 * system sets the REALTIME clock to 0 after boot.
3415 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3419 int64_t measure_clock_offset(void)
3421 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3422 uint64_t tcf
= trace_clock_freq();
3424 unsigned long flags
;
3425 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3426 struct timespec64 rts
= { 0, 0 };
3428 struct timespec rts
= { 0, 0 };
3431 /* Disable interrupts to increase correlation precision. */
3432 local_irq_save(flags
);
3433 monotonic
[0] = trace_clock_read64();
3434 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3435 ktime_get_real_ts64(&rts
);
3437 getnstimeofday(&rts
);
3439 monotonic
[1] = trace_clock_read64();
3440 local_irq_restore(flags
);
3442 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3443 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3444 if (tcf
== NSEC_PER_SEC
) {
3445 realtime
+= rts
.tv_nsec
;
3447 uint64_t n
= rts
.tv_nsec
* tcf
;
3449 do_div(n
, NSEC_PER_SEC
);
3452 offset
= (int64_t) realtime
- monotonic_avg
;
3457 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3465 while (cur
!= '\0') {
3468 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3472 ret
= lttng_metadata_printf(session
, "%c", '\\');
3475 /* We still print the current char */
3478 ret
= lttng_metadata_printf(session
, "%c", cur
);
3492 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3493 const char *field_value
)
3497 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3501 ret
= print_escaped_ctf_string(session
, field_value
);
3505 ret
= lttng_metadata_printf(session
, "\";\n");
3512 * Output metadata into this session's metadata buffers.
3513 * Must be called with sessions_mutex held.
3516 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3518 unsigned char *uuid_c
= session
->uuid
.b
;
3519 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3520 const char *product_uuid
;
3521 struct lttng_channel
*chan
;
3522 struct lttng_event
*event
;
3525 if (!LTTNG_READ_ONCE(session
->active
))
3528 lttng_metadata_begin(session
);
3530 if (session
->metadata_dumped
)
3533 snprintf(uuid_s
, sizeof(uuid_s
),
3534 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3535 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3536 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3537 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3538 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3540 ret
= lttng_metadata_printf(session
,
3541 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3542 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3543 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3544 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3545 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3546 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3547 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3553 " byte_order = %s;\n"
3554 " packet.header := struct {\n"
3555 " uint32_t magic;\n"
3556 " uint8_t uuid[16];\n"
3557 " uint32_t stream_id;\n"
3558 " uint64_t stream_instance_id;\n"
3561 lttng_alignof(uint8_t) * CHAR_BIT
,
3562 lttng_alignof(uint16_t) * CHAR_BIT
,
3563 lttng_alignof(uint32_t) * CHAR_BIT
,
3564 lttng_alignof(uint64_t) * CHAR_BIT
,
3565 sizeof(unsigned long) * CHAR_BIT
,
3566 lttng_alignof(unsigned long) * CHAR_BIT
,
3570 #if __BYTE_ORDER == __BIG_ENDIAN
3579 ret
= lttng_metadata_printf(session
,
3581 " hostname = \"%s\";\n"
3582 " domain = \"kernel\";\n"
3583 " sysname = \"%s\";\n"
3584 " kernel_release = \"%s\";\n"
3585 " kernel_version = \"%s\";\n"
3586 " tracer_name = \"lttng-modules\";\n"
3587 " tracer_major = %d;\n"
3588 " tracer_minor = %d;\n"
3589 " tracer_patchlevel = %d;\n"
3590 " trace_buffering_scheme = \"global\";\n",
3591 current
->nsproxy
->uts_ns
->name
.nodename
,
3595 LTTNG_MODULES_MAJOR_VERSION
,
3596 LTTNG_MODULES_MINOR_VERSION
,
3597 LTTNG_MODULES_PATCHLEVEL_VERSION
3602 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3605 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3606 session
->creation_time
);
3610 /* Add the product UUID to the 'env' section */
3611 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3613 ret
= lttng_metadata_printf(session
,
3614 " product_uuid = \"%s\";\n",
3621 /* Close the 'env' section */
3622 ret
= lttng_metadata_printf(session
, "};\n\n");
3626 ret
= lttng_metadata_printf(session
,
3628 " name = \"%s\";\n",
3634 if (!trace_clock_uuid(clock_uuid_s
)) {
3635 ret
= lttng_metadata_printf(session
,
3636 " uuid = \"%s\";\n",
3643 ret
= lttng_metadata_printf(session
,
3644 " description = \"%s\";\n"
3645 " freq = %llu; /* Frequency, in Hz */\n"
3646 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3649 trace_clock_description(),
3650 (unsigned long long) trace_clock_freq(),
3651 (long long) measure_clock_offset()
3656 ret
= lttng_metadata_printf(session
,
3657 "typealias integer {\n"
3658 " size = 27; align = 1; signed = false;\n"
3659 " map = clock.%s.value;\n"
3660 "} := uint27_clock_monotonic_t;\n"
3662 "typealias integer {\n"
3663 " size = 32; align = %u; signed = false;\n"
3664 " map = clock.%s.value;\n"
3665 "} := uint32_clock_monotonic_t;\n"
3667 "typealias integer {\n"
3668 " size = 64; align = %u; signed = false;\n"
3669 " map = clock.%s.value;\n"
3670 "} := uint64_clock_monotonic_t;\n\n",
3672 lttng_alignof(uint32_t) * CHAR_BIT
,
3674 lttng_alignof(uint64_t) * CHAR_BIT
,
3680 ret
= _lttng_stream_packet_context_declare(session
);
3684 ret
= _lttng_event_header_declare(session
);
3689 list_for_each_entry(chan
, &session
->chan
, list
) {
3690 ret
= _lttng_channel_metadata_statedump(session
, chan
);
3695 list_for_each_entry(event
, &session
->events
, list
) {
3696 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
3700 session
->metadata_dumped
= 1;
3702 lttng_metadata_end(session
);
3707 * lttng_transport_register - LTT transport registration
3708 * @transport: transport structure
3710 * Registers a transport which can be used as output to extract the data out of
3711 * LTTng. The module calling this registration function must ensure that no
3712 * trap-inducing code will be executed by the transport functions. E.g.
3713 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3714 * is made visible to the transport function. This registration acts as a
3715 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3716 * after its registration must it synchronize the TLBs.
3718 void lttng_transport_register(struct lttng_transport
*transport
)
3721 * Make sure no page fault can be triggered by the module about to be
3722 * registered. We deal with this here so we don't have to call
3723 * vmalloc_sync_mappings() in each module's init.
3725 wrapper_vmalloc_sync_mappings();
3727 mutex_lock(&sessions_mutex
);
3728 list_add_tail(&transport
->node
, <tng_transport_list
);
3729 mutex_unlock(&sessions_mutex
);
3731 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3734 * lttng_transport_unregister - LTT transport unregistration
3735 * @transport: transport structure
3737 void lttng_transport_unregister(struct lttng_transport
*transport
)
3739 mutex_lock(&sessions_mutex
);
3740 list_del(&transport
->node
);
3741 mutex_unlock(&sessions_mutex
);
3743 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
3745 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
3747 enum cpuhp_state lttng_hp_prepare
;
3748 enum cpuhp_state lttng_hp_online
;
3750 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
3752 struct lttng_cpuhp_node
*lttng_node
;
3754 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3755 switch (lttng_node
->component
) {
3756 case LTTNG_RING_BUFFER_FRONTEND
:
3758 case LTTNG_RING_BUFFER_BACKEND
:
3759 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
3760 case LTTNG_RING_BUFFER_ITER
:
3762 case LTTNG_CONTEXT_PERF_COUNTERS
:
3769 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
3771 struct lttng_cpuhp_node
*lttng_node
;
3773 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3774 switch (lttng_node
->component
) {
3775 case LTTNG_RING_BUFFER_FRONTEND
:
3776 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
3777 case LTTNG_RING_BUFFER_BACKEND
:
3779 case LTTNG_RING_BUFFER_ITER
:
3781 case LTTNG_CONTEXT_PERF_COUNTERS
:
3782 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
3788 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
3790 struct lttng_cpuhp_node
*lttng_node
;
3792 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3793 switch (lttng_node
->component
) {
3794 case LTTNG_RING_BUFFER_FRONTEND
:
3795 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
3796 case LTTNG_RING_BUFFER_BACKEND
:
3798 case LTTNG_RING_BUFFER_ITER
:
3799 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
3800 case LTTNG_CONTEXT_PERF_COUNTERS
:
3801 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
3807 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
3809 struct lttng_cpuhp_node
*lttng_node
;
3811 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3812 switch (lttng_node
->component
) {
3813 case LTTNG_RING_BUFFER_FRONTEND
:
3814 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
3815 case LTTNG_RING_BUFFER_BACKEND
:
3817 case LTTNG_RING_BUFFER_ITER
:
3819 case LTTNG_CONTEXT_PERF_COUNTERS
:
3826 static int __init
lttng_init_cpu_hotplug(void)
3830 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
3831 lttng_hotplug_prepare
,
3832 lttng_hotplug_dead
);
3836 lttng_hp_prepare
= ret
;
3837 lttng_rb_set_hp_prepare(ret
);
3839 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
3840 lttng_hotplug_online
,
3841 lttng_hotplug_offline
);
3843 cpuhp_remove_multi_state(lttng_hp_prepare
);
3844 lttng_hp_prepare
= 0;
3847 lttng_hp_online
= ret
;
3848 lttng_rb_set_hp_online(ret
);
3853 static void __exit
lttng_exit_cpu_hotplug(void)
3855 lttng_rb_set_hp_online(0);
3856 cpuhp_remove_multi_state(lttng_hp_online
);
3857 lttng_rb_set_hp_prepare(0);
3858 cpuhp_remove_multi_state(lttng_hp_prepare
);
3861 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
3862 static int lttng_init_cpu_hotplug(void)
3866 static void lttng_exit_cpu_hotplug(void)
3869 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
3872 static int __init
lttng_events_init(void)
3876 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
3879 ret
= wrapper_get_pfnblock_flags_mask_init();
3882 ret
= wrapper_get_pageblock_flags_mask_init();
3885 ret
= lttng_probes_init();
3888 ret
= lttng_context_init();
3891 ret
= lttng_tracepoint_init();
3894 event_cache
= KMEM_CACHE(lttng_event
, 0);
3897 goto error_kmem_event
;
3899 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
3900 if (!event_notifier_cache
) {
3902 goto error_kmem_event_notifier
;
3904 ret
= lttng_abi_init();
3907 ret
= lttng_logger_init();
3910 ret
= lttng_init_cpu_hotplug();
3913 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
3914 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3915 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3916 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3917 LTTNG_MODULES_EXTRAVERSION
,
3919 #ifdef LTTNG_EXTRA_VERSION_GIT
3920 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3924 #ifdef LTTNG_EXTRA_VERSION_NAME
3925 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3932 lttng_logger_exit();
3936 kmem_cache_destroy(event_notifier_cache
);
3937 error_kmem_event_notifier
:
3938 kmem_cache_destroy(event_cache
);
3940 lttng_tracepoint_exit();
3942 lttng_context_exit();
3943 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
3944 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3945 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3946 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3947 LTTNG_MODULES_EXTRAVERSION
,
3949 #ifdef LTTNG_EXTRA_VERSION_GIT
3950 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3954 #ifdef LTTNG_EXTRA_VERSION_NAME
3955 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3962 module_init(lttng_events_init
);
3964 static void __exit
lttng_events_exit(void)
3966 struct lttng_session
*session
, *tmpsession
;
3968 lttng_exit_cpu_hotplug();
3969 lttng_logger_exit();
3971 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
3972 lttng_session_destroy(session
);
3973 kmem_cache_destroy(event_cache
);
3974 kmem_cache_destroy(event_notifier_cache
);
3975 lttng_tracepoint_exit();
3976 lttng_context_exit();
3977 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
3978 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3979 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3980 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3981 LTTNG_MODULES_EXTRAVERSION
,
3983 #ifdef LTTNG_EXTRA_VERSION_GIT
3984 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3988 #ifdef LTTNG_EXTRA_VERSION_NAME
3989 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3995 module_exit(lttng_events_exit
);
3997 #include <generated/patches.h>
3998 #ifdef LTTNG_EXTRA_VERSION_GIT
3999 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4001 #ifdef LTTNG_EXTRA_VERSION_NAME
4002 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4004 MODULE_LICENSE("GPL and additional rights");
4005 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4006 MODULE_DESCRIPTION("LTTng tracer");
4007 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4008 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4009 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4010 LTTNG_MODULES_EXTRAVERSION
);