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/lttng-bytecode.h>
40 #include <lttng/tracer.h>
41 #include <lttng/event-notifier-notification.h>
42 #include <lttng/abi-old.h>
43 #include <lttng/endian.h>
44 #include <lttng/string-utils.h>
45 #include <lttng/utils.h>
46 #include <ringbuffer/backend.h>
47 #include <ringbuffer/frontend.h>
48 #include <wrapper/time.h>
50 #define METADATA_CACHE_DEFAULT_SIZE 4096
52 static LIST_HEAD(sessions
);
53 static LIST_HEAD(event_notifier_groups
);
54 static LIST_HEAD(lttng_transport_list
);
55 static LIST_HEAD(lttng_counter_transport_list
);
57 * Protect the sessions and metadata caches.
59 static DEFINE_MUTEX(sessions_mutex
);
60 static struct kmem_cache
*event_cache
;
61 static struct kmem_cache
*event_notifier_cache
;
63 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
64 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
65 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
66 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
67 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
69 static void _lttng_event_destroy(struct lttng_event
*event
);
70 static void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
);
71 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
72 static int _lttng_event_unregister(struct lttng_event
*event
);
73 static int _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
);
75 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
76 struct lttng_channel
*chan
,
77 struct lttng_event
*event
);
79 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
81 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
83 int _lttng_type_statedump(struct lttng_session
*session
,
84 const struct lttng_type
*type
,
87 int _lttng_field_statedump(struct lttng_session
*session
,
88 const struct lttng_event_field
*field
,
91 void synchronize_trace(void)
93 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
99 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
100 #ifdef CONFIG_PREEMPT_RT_FULL
103 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
104 #ifdef CONFIG_PREEMPT_RT
107 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
110 void lttng_lock_sessions(void)
112 mutex_lock(&sessions_mutex
);
115 void lttng_unlock_sessions(void)
117 mutex_unlock(&sessions_mutex
);
120 static struct lttng_transport
*lttng_transport_find(const char *name
)
122 struct lttng_transport
*transport
;
124 list_for_each_entry(transport
, <tng_transport_list
, node
) {
125 if (!strcmp(transport
->name
, name
))
132 * Called with sessions lock held.
134 int lttng_session_active(void)
136 struct lttng_session
*iter
;
138 list_for_each_entry(iter
, &sessions
, list
) {
145 struct lttng_session
*lttng_session_create(void)
147 struct lttng_session
*session
;
148 struct lttng_metadata_cache
*metadata_cache
;
151 mutex_lock(&sessions_mutex
);
152 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
155 INIT_LIST_HEAD(&session
->chan
);
156 INIT_LIST_HEAD(&session
->events
);
157 lttng_guid_gen(&session
->uuid
);
159 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
162 goto err_free_session
;
163 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
164 if (!metadata_cache
->data
)
166 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
167 kref_init(&metadata_cache
->refcount
);
168 mutex_init(&metadata_cache
->lock
);
169 session
->metadata_cache
= metadata_cache
;
170 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
171 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
172 sizeof(metadata_cache
->uuid
));
173 INIT_LIST_HEAD(&session
->enablers_head
);
174 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
175 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
176 list_add(&session
->list
, &sessions
);
177 session
->pid_tracker
.session
= session
;
178 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
179 session
->vpid_tracker
.session
= session
;
180 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
181 session
->uid_tracker
.session
= session
;
182 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
183 session
->vuid_tracker
.session
= session
;
184 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
185 session
->gid_tracker
.session
= session
;
186 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
187 session
->vgid_tracker
.session
= session
;
188 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
189 mutex_unlock(&sessions_mutex
);
193 kfree(metadata_cache
);
195 lttng_kvfree(session
);
197 mutex_unlock(&sessions_mutex
);
201 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
203 struct lttng_transport
*transport
= NULL
;
204 struct lttng_event_notifier_group
*event_notifier_group
;
205 const char *transport_name
= "relay-event-notifier";
206 size_t subbuf_size
= 4096; //TODO
207 size_t num_subbuf
= 16; //TODO
208 unsigned int switch_timer_interval
= 0;
209 unsigned int read_timer_interval
= 0;
212 mutex_lock(&sessions_mutex
);
214 transport
= lttng_transport_find(transport_name
);
216 printk(KERN_WARNING
"LTTng: transport %s not found\n",
220 if (!try_module_get(transport
->owner
)) {
221 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
226 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
228 if (!event_notifier_group
)
232 * Initialize the ring buffer used to store event notifier
235 event_notifier_group
->ops
= &transport
->ops
;
236 event_notifier_group
->chan
= transport
->ops
.channel_create(
237 transport_name
, event_notifier_group
, NULL
,
238 subbuf_size
, num_subbuf
, switch_timer_interval
,
239 read_timer_interval
);
240 if (!event_notifier_group
->chan
)
243 event_notifier_group
->transport
= transport
;
245 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
246 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
247 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
248 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
250 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
252 mutex_unlock(&sessions_mutex
);
254 return event_notifier_group
;
257 lttng_kvfree(event_notifier_group
);
260 module_put(transport
->owner
);
262 mutex_unlock(&sessions_mutex
);
266 void metadata_cache_destroy(struct kref
*kref
)
268 struct lttng_metadata_cache
*cache
=
269 container_of(kref
, struct lttng_metadata_cache
, refcount
);
274 void lttng_session_destroy(struct lttng_session
*session
)
276 struct lttng_channel
*chan
, *tmpchan
;
277 struct lttng_event
*event
, *tmpevent
;
278 struct lttng_metadata_stream
*metadata_stream
;
279 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
282 mutex_lock(&sessions_mutex
);
283 WRITE_ONCE(session
->active
, 0);
284 list_for_each_entry(chan
, &session
->chan
, list
) {
285 ret
= lttng_syscalls_unregister_event(chan
);
288 list_for_each_entry(event
, &session
->events
, list
) {
289 ret
= _lttng_event_unregister(event
);
292 synchronize_trace(); /* Wait for in-flight events to complete */
293 list_for_each_entry(chan
, &session
->chan
, list
) {
294 ret
= lttng_syscalls_destroy_event(chan
);
297 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
298 &session
->enablers_head
, node
)
299 lttng_event_enabler_destroy(event_enabler
);
300 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
301 _lttng_event_destroy(event
);
302 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
303 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
304 _lttng_channel_destroy(chan
);
306 mutex_lock(&session
->metadata_cache
->lock
);
307 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
308 _lttng_metadata_channel_hangup(metadata_stream
);
309 mutex_unlock(&session
->metadata_cache
->lock
);
310 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
311 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
312 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
313 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
314 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
315 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
316 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
317 list_del(&session
->list
);
318 mutex_unlock(&sessions_mutex
);
319 lttng_kvfree(session
);
322 void lttng_event_notifier_group_destroy(
323 struct lttng_event_notifier_group
*event_notifier_group
)
325 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
326 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
329 if (!event_notifier_group
)
332 mutex_lock(&sessions_mutex
);
334 ret
= lttng_syscalls_unregister_event_notifier(event_notifier_group
);
337 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
338 &event_notifier_group
->event_notifiers_head
, list
) {
339 ret
= _lttng_event_notifier_unregister(event_notifier
);
343 /* Wait for in-flight event notifier to complete */
346 irq_work_sync(&event_notifier_group
->wakeup_pending
);
348 kfree(event_notifier_group
->sc_filter
);
350 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
351 &event_notifier_group
->enablers_head
, node
)
352 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
354 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
355 &event_notifier_group
->event_notifiers_head
, list
)
356 _lttng_event_notifier_destroy(event_notifier
);
358 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
359 module_put(event_notifier_group
->transport
->owner
);
360 list_del(&event_notifier_group
->node
);
362 mutex_unlock(&sessions_mutex
);
363 lttng_kvfree(event_notifier_group
);
366 int lttng_session_statedump(struct lttng_session
*session
)
370 mutex_lock(&sessions_mutex
);
371 ret
= lttng_statedump_start(session
);
372 mutex_unlock(&sessions_mutex
);
376 int lttng_session_enable(struct lttng_session
*session
)
379 struct lttng_channel
*chan
;
381 mutex_lock(&sessions_mutex
);
382 if (session
->active
) {
387 /* Set transient enabler state to "enabled" */
390 /* We need to sync enablers with session before activation. */
391 lttng_session_sync_event_enablers(session
);
394 * Snapshot the number of events per channel to know the type of header
397 list_for_each_entry(chan
, &session
->chan
, list
) {
398 if (chan
->header_type
)
399 continue; /* don't change it if session stop/restart */
400 if (chan
->free_event_id
< 31)
401 chan
->header_type
= 1; /* compact */
403 chan
->header_type
= 2; /* large */
406 /* Clear each stream's quiescent state. */
407 list_for_each_entry(chan
, &session
->chan
, list
) {
408 if (chan
->channel_type
!= METADATA_CHANNEL
)
409 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
412 WRITE_ONCE(session
->active
, 1);
413 WRITE_ONCE(session
->been_active
, 1);
414 ret
= _lttng_session_metadata_statedump(session
);
416 WRITE_ONCE(session
->active
, 0);
419 ret
= lttng_statedump_start(session
);
421 WRITE_ONCE(session
->active
, 0);
423 mutex_unlock(&sessions_mutex
);
427 int lttng_session_disable(struct lttng_session
*session
)
430 struct lttng_channel
*chan
;
432 mutex_lock(&sessions_mutex
);
433 if (!session
->active
) {
437 WRITE_ONCE(session
->active
, 0);
439 /* Set transient enabler state to "disabled" */
441 lttng_session_sync_event_enablers(session
);
443 /* Set each stream's quiescent state. */
444 list_for_each_entry(chan
, &session
->chan
, list
) {
445 if (chan
->channel_type
!= METADATA_CHANNEL
)
446 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
449 mutex_unlock(&sessions_mutex
);
453 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
456 struct lttng_channel
*chan
;
457 struct lttng_event
*event
;
458 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
459 struct lttng_metadata_stream
*stream
;
461 mutex_lock(&sessions_mutex
);
462 if (!session
->active
) {
467 mutex_lock(&cache
->lock
);
468 memset(cache
->data
, 0, cache
->cache_alloc
);
469 cache
->metadata_written
= 0;
471 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
472 stream
->metadata_out
= 0;
473 stream
->metadata_in
= 0;
475 mutex_unlock(&cache
->lock
);
477 session
->metadata_dumped
= 0;
478 list_for_each_entry(chan
, &session
->chan
, list
) {
479 chan
->metadata_dumped
= 0;
482 list_for_each_entry(event
, &session
->events
, list
) {
483 event
->metadata_dumped
= 0;
486 ret
= _lttng_session_metadata_statedump(session
);
489 mutex_unlock(&sessions_mutex
);
493 int lttng_channel_enable(struct lttng_channel
*channel
)
497 mutex_lock(&sessions_mutex
);
498 if (channel
->channel_type
== METADATA_CHANNEL
) {
502 if (channel
->enabled
) {
506 /* Set transient enabler state to "enabled" */
508 lttng_session_sync_event_enablers(channel
->session
);
509 /* Set atomically the state to "enabled" */
510 WRITE_ONCE(channel
->enabled
, 1);
512 mutex_unlock(&sessions_mutex
);
516 int lttng_channel_disable(struct lttng_channel
*channel
)
520 mutex_lock(&sessions_mutex
);
521 if (channel
->channel_type
== METADATA_CHANNEL
) {
525 if (!channel
->enabled
) {
529 /* Set atomically the state to "disabled" */
530 WRITE_ONCE(channel
->enabled
, 0);
531 /* Set transient enabler state to "enabled" */
533 lttng_session_sync_event_enablers(channel
->session
);
535 mutex_unlock(&sessions_mutex
);
539 int lttng_event_enable(struct lttng_event
*event
)
543 mutex_lock(&sessions_mutex
);
544 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
548 if (event
->enabled
) {
552 switch (event
->instrumentation
) {
553 case LTTNG_KERNEL_TRACEPOINT
:
554 case LTTNG_KERNEL_SYSCALL
:
557 case LTTNG_KERNEL_KPROBE
:
558 case LTTNG_KERNEL_UPROBE
:
559 case LTTNG_KERNEL_NOOP
:
560 WRITE_ONCE(event
->enabled
, 1);
562 case LTTNG_KERNEL_KRETPROBE
:
563 ret
= lttng_kretprobes_event_enable_state(event
, 1);
565 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
571 mutex_unlock(&sessions_mutex
);
575 int lttng_event_disable(struct lttng_event
*event
)
579 mutex_lock(&sessions_mutex
);
580 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
584 if (!event
->enabled
) {
588 switch (event
->instrumentation
) {
589 case LTTNG_KERNEL_TRACEPOINT
:
590 case LTTNG_KERNEL_SYSCALL
:
593 case LTTNG_KERNEL_KPROBE
:
594 case LTTNG_KERNEL_UPROBE
:
595 case LTTNG_KERNEL_NOOP
:
596 WRITE_ONCE(event
->enabled
, 0);
598 case LTTNG_KERNEL_KRETPROBE
:
599 ret
= lttng_kretprobes_event_enable_state(event
, 0);
601 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
607 mutex_unlock(&sessions_mutex
);
611 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
615 mutex_lock(&sessions_mutex
);
616 if (event_notifier
->enabled
) {
620 switch (event_notifier
->instrumentation
) {
621 case LTTNG_KERNEL_TRACEPOINT
:
622 case LTTNG_KERNEL_SYSCALL
:
625 case LTTNG_KERNEL_KPROBE
:
626 case LTTNG_KERNEL_UPROBE
:
627 WRITE_ONCE(event_notifier
->enabled
, 1);
629 case LTTNG_KERNEL_FUNCTION
:
630 case LTTNG_KERNEL_NOOP
:
631 case LTTNG_KERNEL_KRETPROBE
:
637 mutex_unlock(&sessions_mutex
);
641 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
645 mutex_lock(&sessions_mutex
);
646 if (!event_notifier
->enabled
) {
650 switch (event_notifier
->instrumentation
) {
651 case LTTNG_KERNEL_TRACEPOINT
:
652 case LTTNG_KERNEL_SYSCALL
:
655 case LTTNG_KERNEL_KPROBE
:
656 case LTTNG_KERNEL_UPROBE
:
657 WRITE_ONCE(event_notifier
->enabled
, 0);
659 case LTTNG_KERNEL_FUNCTION
:
660 case LTTNG_KERNEL_NOOP
:
661 case LTTNG_KERNEL_KRETPROBE
:
667 mutex_unlock(&sessions_mutex
);
671 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
672 const char *transport_name
,
674 size_t subbuf_size
, size_t num_subbuf
,
675 unsigned int switch_timer_interval
,
676 unsigned int read_timer_interval
,
677 enum channel_type channel_type
)
679 struct lttng_channel
*chan
;
680 struct lttng_transport
*transport
= NULL
;
682 mutex_lock(&sessions_mutex
);
683 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
684 goto active
; /* Refuse to add channel to active session */
685 transport
= lttng_transport_find(transport_name
);
687 printk(KERN_WARNING
"LTTng: transport %s not found\n",
691 if (!try_module_get(transport
->owner
)) {
692 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
695 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
698 chan
->session
= session
;
699 chan
->id
= session
->free_chan_id
++;
700 chan
->ops
= &transport
->ops
;
702 * Note: the channel creation op already writes into the packet
703 * headers. Therefore the "chan" information used as input
704 * should be already accessible.
706 chan
->chan
= transport
->ops
.channel_create(transport_name
,
707 chan
, buf_addr
, subbuf_size
, num_subbuf
,
708 switch_timer_interval
, read_timer_interval
);
713 chan
->transport
= transport
;
714 chan
->channel_type
= channel_type
;
715 list_add(&chan
->list
, &session
->chan
);
716 mutex_unlock(&sessions_mutex
);
723 module_put(transport
->owner
);
726 mutex_unlock(&sessions_mutex
);
731 * Only used internally at session destruction for per-cpu channels, and
732 * when metadata channel is released.
733 * Needs to be called with sessions mutex held.
736 void _lttng_channel_destroy(struct lttng_channel
*chan
)
738 chan
->ops
->channel_destroy(chan
->chan
);
739 module_put(chan
->transport
->owner
);
740 list_del(&chan
->list
);
741 lttng_destroy_context(chan
->ctx
);
745 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
747 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
749 /* Protect the metadata cache with the sessions_mutex. */
750 mutex_lock(&sessions_mutex
);
751 _lttng_channel_destroy(chan
);
752 mutex_unlock(&sessions_mutex
);
754 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
757 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
759 stream
->finalized
= 1;
760 wake_up_interruptible(&stream
->read_wait
);
764 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
766 struct lttng_counter_transport
*transport
;
768 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
769 if (!strcmp(transport
->name
, name
))
776 * Supports event creation while tracing session is active.
777 * Needs to be called with sessions mutex held.
779 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
780 struct lttng_kernel_event
*event_param
,
782 const struct lttng_event_desc
*event_desc
,
783 enum lttng_kernel_instrumentation itype
)
785 struct lttng_session
*session
= chan
->session
;
786 struct lttng_event
*event
;
787 const char *event_name
;
788 struct hlist_head
*head
;
791 if (chan
->free_event_id
== -1U) {
797 case LTTNG_KERNEL_TRACEPOINT
:
798 event_name
= event_desc
->name
;
800 case LTTNG_KERNEL_KPROBE
:
801 case LTTNG_KERNEL_UPROBE
:
802 case LTTNG_KERNEL_KRETPROBE
:
803 case LTTNG_KERNEL_NOOP
:
804 case LTTNG_KERNEL_SYSCALL
:
805 event_name
= event_param
->name
;
807 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
814 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
815 LTTNG_EVENT_HT_SIZE
, event_name
);
816 lttng_hlist_for_each_entry(event
, head
, hlist
) {
817 WARN_ON_ONCE(!event
->desc
);
818 if (!strncmp(event
->desc
->name
, event_name
,
819 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
820 && chan
== event
->chan
) {
826 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
832 event
->filter
= filter
;
833 event
->id
= chan
->free_event_id
++;
834 event
->instrumentation
= itype
;
835 event
->evtype
= LTTNG_TYPE_EVENT
;
836 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
837 INIT_LIST_HEAD(&event
->enablers_ref_head
);
840 case LTTNG_KERNEL_TRACEPOINT
:
841 /* Event will be enabled by enabler sync. */
843 event
->registered
= 0;
844 event
->desc
= lttng_event_desc_get(event_name
);
849 /* Populate lttng_event structure before event registration. */
852 case LTTNG_KERNEL_KPROBE
:
854 * Needs to be explicitly enabled after creation, since
855 * we may want to apply filters.
858 event
->registered
= 1;
860 * Populate lttng_event structure before event
864 ret
= lttng_kprobes_register_event(event_name
,
865 event_param
->u
.kprobe
.symbol_name
,
866 event_param
->u
.kprobe
.offset
,
867 event_param
->u
.kprobe
.addr
,
873 ret
= try_module_get(event
->desc
->owner
);
876 case LTTNG_KERNEL_KRETPROBE
:
878 struct lttng_event
*event_return
;
880 /* kretprobe defines 2 events */
882 * Needs to be explicitly enabled after creation, since
883 * we may want to apply filters.
886 event
->registered
= 1;
888 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
893 event_return
->chan
= chan
;
894 event_return
->filter
= filter
;
895 event_return
->id
= chan
->free_event_id
++;
896 event_return
->enabled
= 0;
897 event_return
->registered
= 1;
898 event_return
->instrumentation
= itype
;
900 * Populate lttng_event structure before kretprobe registration.
903 ret
= lttng_kretprobes_register(event_name
,
904 event_param
->u
.kretprobe
.symbol_name
,
905 event_param
->u
.kretprobe
.offset
,
906 event_param
->u
.kretprobe
.addr
,
907 event
, event_return
);
909 kmem_cache_free(event_cache
, event_return
);
913 /* Take 2 refs on the module: one per event. */
914 ret
= try_module_get(event
->desc
->owner
);
916 ret
= try_module_get(event
->desc
->owner
);
918 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
920 WARN_ON_ONCE(ret
> 0);
922 kmem_cache_free(event_cache
, event_return
);
923 module_put(event
->desc
->owner
);
924 module_put(event
->desc
->owner
);
925 goto statedump_error
;
927 list_add(&event_return
->list
, &chan
->session
->events
);
930 case LTTNG_KERNEL_NOOP
:
931 case LTTNG_KERNEL_SYSCALL
:
933 * Needs to be explicitly enabled after creation, since
934 * we may want to apply filters.
937 event
->registered
= 0;
938 event
->desc
= event_desc
;
939 switch (event_param
->u
.syscall
.entryexit
) {
940 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
943 case LTTNG_KERNEL_SYSCALL_ENTRY
:
944 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
946 case LTTNG_KERNEL_SYSCALL_EXIT
:
947 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
950 switch (event_param
->u
.syscall
.abi
) {
951 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
954 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
955 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
957 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
958 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
966 case LTTNG_KERNEL_UPROBE
:
968 * Needs to be explicitly enabled after creation, since
969 * we may want to apply filters.
972 event
->registered
= 1;
975 * Populate lttng_event structure before event
980 ret
= lttng_uprobes_register_event(event_param
->name
,
981 event_param
->u
.uprobe
.fd
,
985 ret
= try_module_get(event
->desc
->owner
);
988 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
994 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
995 WARN_ON_ONCE(ret
> 0);
997 goto statedump_error
;
999 hlist_add_head(&event
->hlist
, head
);
1000 list_add(&event
->list
, &chan
->session
->events
);
1004 /* If a statedump error occurs, events will not be readable. */
1006 kmem_cache_free(event_cache
, event
);
1011 return ERR_PTR(ret
);
1014 struct lttng_event_notifier
*_lttng_event_notifier_create(
1015 const struct lttng_event_desc
*event_desc
,
1016 uint64_t token
, struct lttng_event_notifier_group
*event_notifier_group
,
1017 struct lttng_kernel_event_notifier
*event_notifier_param
,
1018 void *filter
, enum lttng_kernel_instrumentation itype
)
1020 struct lttng_event_notifier
*event_notifier
;
1021 const char *event_name
;
1022 struct hlist_head
*head
;
1026 case LTTNG_KERNEL_TRACEPOINT
:
1027 event_name
= event_desc
->name
;
1029 case LTTNG_KERNEL_KPROBE
:
1030 case LTTNG_KERNEL_UPROBE
:
1031 case LTTNG_KERNEL_SYSCALL
:
1032 event_name
= event_notifier_param
->event
.name
;
1034 case LTTNG_KERNEL_KRETPROBE
:
1035 case LTTNG_KERNEL_FUNCTION
:
1036 case LTTNG_KERNEL_NOOP
:
1043 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1044 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1045 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1046 WARN_ON_ONCE(!event_notifier
->desc
);
1047 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1048 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1049 && event_notifier_group
== event_notifier
->group
1050 && token
== event_notifier
->user_token
) {
1056 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1057 if (!event_notifier
) {
1062 event_notifier
->group
= event_notifier_group
;
1063 event_notifier
->user_token
= token
;
1064 event_notifier
->num_captures
= 0;
1065 event_notifier
->filter
= filter
;
1066 event_notifier
->instrumentation
= itype
;
1067 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1068 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1069 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1070 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1071 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1074 case LTTNG_KERNEL_TRACEPOINT
:
1075 /* Event will be enabled by enabler sync. */
1076 event_notifier
->enabled
= 0;
1077 event_notifier
->registered
= 0;
1078 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1079 if (!event_notifier
->desc
) {
1081 goto register_error
;
1083 /* Populate lttng_event_notifier structure before event registration. */
1086 case LTTNG_KERNEL_KPROBE
:
1088 * Needs to be explicitly enabled after creation, since
1089 * we may want to apply filters.
1091 event_notifier
->enabled
= 0;
1092 event_notifier
->registered
= 1;
1094 * Populate lttng_event_notifier structure before event
1098 ret
= lttng_kprobes_register_event_notifier(
1099 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1100 event_notifier_param
->event
.u
.kprobe
.offset
,
1101 event_notifier_param
->event
.u
.kprobe
.addr
,
1105 goto register_error
;
1107 ret
= try_module_get(event_notifier
->desc
->owner
);
1110 case LTTNG_KERNEL_NOOP
:
1111 case LTTNG_KERNEL_SYSCALL
:
1113 * Needs to be explicitly enabled after creation, since
1114 * we may want to apply filters.
1116 event_notifier
->enabled
= 0;
1117 event_notifier
->registered
= 0;
1118 event_notifier
->desc
= event_desc
;
1119 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1120 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1122 goto register_error
;
1123 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1124 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1126 case LTTNG_KERNEL_SYSCALL_EXIT
:
1127 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1130 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1131 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1133 goto register_error
;
1134 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1135 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1137 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1138 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1142 if (!event_notifier
->desc
) {
1144 goto register_error
;
1147 case LTTNG_KERNEL_UPROBE
:
1149 * Needs to be explicitly enabled after creation, since
1150 * we may want to apply filters.
1152 event_notifier
->enabled
= 0;
1153 event_notifier
->registered
= 1;
1156 * Populate lttng_event_notifier structure before
1157 * event_notifier registration.
1161 ret
= lttng_uprobes_register_event_notifier(
1162 event_notifier_param
->event
.name
,
1163 event_notifier_param
->event
.u
.uprobe
.fd
,
1166 goto register_error
;
1167 ret
= try_module_get(event_notifier
->desc
->owner
);
1170 case LTTNG_KERNEL_KRETPROBE
:
1171 case LTTNG_KERNEL_FUNCTION
:
1175 goto register_error
;
1178 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1179 hlist_add_head(&event_notifier
->hlist
, head
);
1180 return event_notifier
;
1183 kmem_cache_free(event_notifier_cache
, event_notifier
);
1187 return ERR_PTR(ret
);
1190 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1191 struct lttng_kernel_event
*event_param
,
1193 const struct lttng_event_desc
*event_desc
,
1194 enum lttng_kernel_instrumentation itype
)
1196 struct lttng_event
*event
;
1198 mutex_lock(&sessions_mutex
);
1199 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1201 mutex_unlock(&sessions_mutex
);
1205 struct lttng_event_notifier
*lttng_event_notifier_create(
1206 const struct lttng_event_desc
*event_desc
,
1207 uint64_t id
, struct lttng_event_notifier_group
*event_notifier_group
,
1208 struct lttng_kernel_event_notifier
*event_notifier_param
,
1209 void *filter
, enum lttng_kernel_instrumentation itype
)
1211 struct lttng_event_notifier
*event_notifier
;
1213 mutex_lock(&sessions_mutex
);
1214 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1215 event_notifier_group
, event_notifier_param
, filter
, itype
);
1216 mutex_unlock(&sessions_mutex
);
1217 return event_notifier
;
1220 /* Only used for tracepoints for now. */
1222 void register_event(struct lttng_event
*event
)
1224 const struct lttng_event_desc
*desc
;
1227 if (event
->registered
)
1231 switch (event
->instrumentation
) {
1232 case LTTNG_KERNEL_TRACEPOINT
:
1233 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1234 desc
->probe_callback
,
1237 case LTTNG_KERNEL_SYSCALL
:
1238 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1240 case LTTNG_KERNEL_KPROBE
:
1241 case LTTNG_KERNEL_UPROBE
:
1242 case LTTNG_KERNEL_KRETPROBE
:
1243 case LTTNG_KERNEL_NOOP
:
1246 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1251 event
->registered
= 1;
1255 * Only used internally at session destruction.
1257 int _lttng_event_unregister(struct lttng_event
*event
)
1259 const struct lttng_event_desc
*desc
;
1262 if (!event
->registered
)
1266 switch (event
->instrumentation
) {
1267 case LTTNG_KERNEL_TRACEPOINT
:
1268 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1269 event
->desc
->probe_callback
,
1272 case LTTNG_KERNEL_KPROBE
:
1273 lttng_kprobes_unregister_event(event
);
1276 case LTTNG_KERNEL_KRETPROBE
:
1277 lttng_kretprobes_unregister(event
);
1280 case LTTNG_KERNEL_SYSCALL
:
1281 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1283 case LTTNG_KERNEL_NOOP
:
1286 case LTTNG_KERNEL_UPROBE
:
1287 lttng_uprobes_unregister_event(event
);
1290 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1295 event
->registered
= 0;
1299 /* Only used for tracepoints for now. */
1301 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1303 const struct lttng_event_desc
*desc
;
1306 if (event_notifier
->registered
)
1309 desc
= event_notifier
->desc
;
1310 switch (event_notifier
->instrumentation
) {
1311 case LTTNG_KERNEL_TRACEPOINT
:
1312 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1313 desc
->event_notifier_callback
,
1316 case LTTNG_KERNEL_SYSCALL
:
1317 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1319 case LTTNG_KERNEL_KPROBE
:
1320 case LTTNG_KERNEL_UPROBE
:
1323 case LTTNG_KERNEL_KRETPROBE
:
1324 case LTTNG_KERNEL_FUNCTION
:
1325 case LTTNG_KERNEL_NOOP
:
1330 event_notifier
->registered
= 1;
1334 int _lttng_event_notifier_unregister(
1335 struct lttng_event_notifier
*event_notifier
)
1337 const struct lttng_event_desc
*desc
;
1340 if (!event_notifier
->registered
)
1343 desc
= event_notifier
->desc
;
1344 switch (event_notifier
->instrumentation
) {
1345 case LTTNG_KERNEL_TRACEPOINT
:
1346 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1347 event_notifier
->desc
->event_notifier_callback
,
1350 case LTTNG_KERNEL_KPROBE
:
1351 lttng_kprobes_unregister_event_notifier(event_notifier
);
1354 case LTTNG_KERNEL_UPROBE
:
1355 lttng_uprobes_unregister_event_notifier(event_notifier
);
1358 case LTTNG_KERNEL_SYSCALL
:
1359 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1361 case LTTNG_KERNEL_KRETPROBE
:
1362 case LTTNG_KERNEL_FUNCTION
:
1363 case LTTNG_KERNEL_NOOP
:
1368 event_notifier
->registered
= 0;
1373 * Only used internally at session destruction.
1376 void _lttng_event_destroy(struct lttng_event
*event
)
1378 switch (event
->instrumentation
) {
1379 case LTTNG_KERNEL_TRACEPOINT
:
1380 lttng_event_desc_put(event
->desc
);
1382 case LTTNG_KERNEL_KPROBE
:
1383 module_put(event
->desc
->owner
);
1384 lttng_kprobes_destroy_event_private(event
);
1386 case LTTNG_KERNEL_KRETPROBE
:
1387 module_put(event
->desc
->owner
);
1388 lttng_kretprobes_destroy_private(event
);
1390 case LTTNG_KERNEL_NOOP
:
1391 case LTTNG_KERNEL_SYSCALL
:
1393 case LTTNG_KERNEL_UPROBE
:
1394 module_put(event
->desc
->owner
);
1395 lttng_uprobes_destroy_event_private(event
);
1397 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1401 list_del(&event
->list
);
1402 lttng_destroy_context(event
->ctx
);
1403 kmem_cache_free(event_cache
, event
);
1407 * Only used internally at session destruction.
1410 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1412 switch (event_notifier
->instrumentation
) {
1413 case LTTNG_KERNEL_TRACEPOINT
:
1414 lttng_event_desc_put(event_notifier
->desc
);
1416 case LTTNG_KERNEL_KPROBE
:
1417 module_put(event_notifier
->desc
->owner
);
1418 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1420 case LTTNG_KERNEL_NOOP
:
1421 case LTTNG_KERNEL_SYSCALL
:
1423 case LTTNG_KERNEL_UPROBE
:
1424 module_put(event_notifier
->desc
->owner
);
1425 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1427 case LTTNG_KERNEL_KRETPROBE
:
1428 case LTTNG_KERNEL_FUNCTION
:
1432 list_del(&event_notifier
->list
);
1433 kmem_cache_free(event_notifier_cache
, event_notifier
);
1436 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1437 enum tracker_type tracker_type
)
1439 switch (tracker_type
) {
1441 return &session
->pid_tracker
;
1443 return &session
->vpid_tracker
;
1445 return &session
->uid_tracker
;
1447 return &session
->vuid_tracker
;
1449 return &session
->gid_tracker
;
1451 return &session
->vgid_tracker
;
1458 int lttng_session_track_id(struct lttng_session
*session
,
1459 enum tracker_type tracker_type
, int id
)
1461 struct lttng_id_tracker
*tracker
;
1464 tracker
= get_tracker(session
, tracker_type
);
1469 mutex_lock(&sessions_mutex
);
1471 /* track all ids: destroy tracker. */
1472 lttng_id_tracker_destroy(tracker
, true);
1475 ret
= lttng_id_tracker_add(tracker
, id
);
1477 mutex_unlock(&sessions_mutex
);
1481 int lttng_session_untrack_id(struct lttng_session
*session
,
1482 enum tracker_type tracker_type
, int id
)
1484 struct lttng_id_tracker
*tracker
;
1487 tracker
= get_tracker(session
, tracker_type
);
1492 mutex_lock(&sessions_mutex
);
1494 /* untrack all ids: replace by empty tracker. */
1495 ret
= lttng_id_tracker_empty_set(tracker
);
1497 ret
= lttng_id_tracker_del(tracker
, id
);
1499 mutex_unlock(&sessions_mutex
);
1504 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1506 struct lttng_id_tracker
*id_tracker
= m
->private;
1507 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1508 struct lttng_id_hash_node
*e
;
1511 mutex_lock(&sessions_mutex
);
1513 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1514 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1516 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1522 /* ID tracker disabled. */
1523 if (iter
>= *pos
&& iter
== 0) {
1524 return id_tracker_p
; /* empty tracker */
1532 /* Called with sessions_mutex held. */
1534 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1536 struct lttng_id_tracker
*id_tracker
= m
->private;
1537 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1538 struct lttng_id_hash_node
*e
;
1543 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1544 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1546 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1547 if (iter
++ >= *ppos
)
1552 /* ID tracker disabled. */
1553 if (iter
>= *ppos
&& iter
== 0)
1554 return p
; /* empty tracker */
1563 void id_list_stop(struct seq_file
*m
, void *p
)
1565 mutex_unlock(&sessions_mutex
);
1569 int id_list_show(struct seq_file
*m
, void *p
)
1571 struct lttng_id_tracker
*id_tracker
= m
->private;
1572 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1575 if (p
== id_tracker_p
) {
1576 /* Tracker disabled. */
1579 const struct lttng_id_hash_node
*e
= p
;
1581 id
= lttng_id_tracker_get_node_id(e
);
1583 switch (id_tracker
->tracker_type
) {
1585 seq_printf(m
, "process { pid = %d; };\n", id
);
1588 seq_printf(m
, "process { vpid = %d; };\n", id
);
1591 seq_printf(m
, "user { uid = %d; };\n", id
);
1594 seq_printf(m
, "user { vuid = %d; };\n", id
);
1597 seq_printf(m
, "group { gid = %d; };\n", id
);
1600 seq_printf(m
, "group { vgid = %d; };\n", id
);
1603 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1609 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1610 .start
= id_list_start
,
1611 .next
= id_list_next
,
1612 .stop
= id_list_stop
,
1613 .show
= id_list_show
,
1617 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1619 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1623 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1625 struct seq_file
*m
= file
->private_data
;
1626 struct lttng_id_tracker
*id_tracker
= m
->private;
1629 WARN_ON_ONCE(!id_tracker
);
1630 ret
= seq_release(inode
, file
);
1632 fput(id_tracker
->session
->file
);
1636 const struct file_operations lttng_tracker_ids_list_fops
= {
1637 .owner
= THIS_MODULE
,
1638 .open
= lttng_tracker_ids_list_open
,
1640 .llseek
= seq_lseek
,
1641 .release
= lttng_tracker_ids_list_release
,
1644 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1645 enum tracker_type tracker_type
)
1647 struct file
*tracker_ids_list_file
;
1651 file_fd
= lttng_get_unused_fd();
1657 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1658 <tng_tracker_ids_list_fops
,
1660 if (IS_ERR(tracker_ids_list_file
)) {
1661 ret
= PTR_ERR(tracker_ids_list_file
);
1664 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1666 goto refcount_error
;
1668 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1671 m
= tracker_ids_list_file
->private_data
;
1673 m
->private = get_tracker(session
, tracker_type
);
1674 BUG_ON(!m
->private);
1675 fd_install(file_fd
, tracker_ids_list_file
);
1680 atomic_long_dec(&session
->file
->f_count
);
1682 fput(tracker_ids_list_file
);
1684 put_unused_fd(file_fd
);
1690 * Enabler management.
1693 int lttng_match_enabler_star_glob(const char *desc_name
,
1694 const char *pattern
)
1696 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1697 desc_name
, LTTNG_SIZE_MAX
))
1703 int lttng_match_enabler_name(const char *desc_name
,
1706 if (strcmp(desc_name
, name
))
1711 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1712 struct lttng_enabler
*enabler
)
1714 const char *desc_name
, *enabler_name
;
1715 bool compat
= false, entry
= false;
1717 enabler_name
= enabler
->event_param
.name
;
1718 switch (enabler
->event_param
.instrumentation
) {
1719 case LTTNG_KERNEL_TRACEPOINT
:
1720 desc_name
= desc
->name
;
1721 switch (enabler
->format_type
) {
1722 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1723 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1724 case LTTNG_ENABLER_FORMAT_NAME
:
1725 return lttng_match_enabler_name(desc_name
, enabler_name
);
1730 case LTTNG_KERNEL_SYSCALL
:
1731 desc_name
= desc
->name
;
1732 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1733 desc_name
+= strlen("compat_");
1736 if (!strncmp(desc_name
, "syscall_exit_",
1737 strlen("syscall_exit_"))) {
1738 desc_name
+= strlen("syscall_exit_");
1739 } else if (!strncmp(desc_name
, "syscall_entry_",
1740 strlen("syscall_entry_"))) {
1741 desc_name
+= strlen("syscall_entry_");
1747 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1748 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1750 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1754 case LTTNG_KERNEL_SYSCALL_EXIT
:
1761 switch (enabler
->event_param
.u
.syscall
.abi
) {
1762 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1764 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1768 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1775 switch (enabler
->event_param
.u
.syscall
.match
) {
1776 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
1777 switch (enabler
->format_type
) {
1778 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1779 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1780 case LTTNG_ENABLER_FORMAT_NAME
:
1781 return lttng_match_enabler_name(desc_name
, enabler_name
);
1786 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
1787 return -EINVAL
; /* Not implemented. */
1799 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1800 struct lttng_event
*event
)
1802 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1805 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1807 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1808 && event
->chan
== event_enabler
->chan
)
1815 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1816 struct lttng_event_notifier
*event_notifier
)
1818 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1819 event_notifier_enabler
);
1821 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
1823 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
1824 && event_notifier
->group
== event_notifier_enabler
->group
1825 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1832 struct lttng_enabler_ref
*lttng_enabler_ref(
1833 struct list_head
*enablers_ref_list
,
1834 struct lttng_enabler
*enabler
)
1836 struct lttng_enabler_ref
*enabler_ref
;
1838 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
1839 if (enabler_ref
->ref
== enabler
)
1846 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1848 struct lttng_session
*session
= event_enabler
->chan
->session
;
1849 struct lttng_probe_desc
*probe_desc
;
1850 const struct lttng_event_desc
*desc
;
1852 struct list_head
*probe_list
;
1854 probe_list
= lttng_get_probe_list_head();
1856 * For each probe event, if we find that a probe event matches
1857 * our enabler, create an associated lttng_event if not
1860 list_for_each_entry(probe_desc
, probe_list
, head
) {
1861 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1863 struct hlist_head
*head
;
1864 struct lttng_event
*event
;
1866 desc
= probe_desc
->event_desc
[i
];
1867 if (!lttng_desc_match_enabler(desc
,
1868 lttng_event_enabler_as_enabler(event_enabler
)))
1872 * Check if already created.
1874 head
= utils_borrow_hash_table_bucket(
1875 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
1877 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1878 if (event
->desc
== desc
1879 && event
->chan
== event_enabler
->chan
)
1886 * We need to create an event for this
1889 event
= _lttng_event_create(event_enabler
->chan
,
1891 LTTNG_KERNEL_TRACEPOINT
);
1893 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
1894 probe_desc
->event_desc
[i
]->name
);
1901 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1903 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1904 struct lttng_probe_desc
*probe_desc
;
1905 const struct lttng_event_desc
*desc
;
1907 struct list_head
*probe_list
;
1909 probe_list
= lttng_get_probe_list_head();
1911 * For each probe event, if we find that a probe event matches
1912 * our enabler, create an associated lttng_event_notifier if not
1915 list_for_each_entry(probe_desc
, probe_list
, head
) {
1916 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1918 struct hlist_head
*head
;
1919 struct lttng_event_notifier
*event_notifier
;
1921 desc
= probe_desc
->event_desc
[i
];
1922 if (!lttng_desc_match_enabler(desc
,
1923 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1927 * Check if already created.
1929 head
= utils_borrow_hash_table_bucket(
1930 event_notifier_group
->event_notifiers_ht
.table
,
1931 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
1932 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1933 if (event_notifier
->desc
== desc
1934 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1941 * We need to create a event_notifier for this event probe.
1943 event_notifier
= _lttng_event_notifier_create(desc
,
1944 event_notifier_enabler
->base
.user_token
,
1945 event_notifier_group
, NULL
, NULL
,
1946 LTTNG_KERNEL_TRACEPOINT
);
1947 if (IS_ERR(event_notifier
)) {
1948 printk(KERN_INFO
"Unable to create event_notifier %s\n",
1949 probe_desc
->event_desc
[i
]->name
);
1956 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1960 ret
= lttng_syscalls_register_event(event_enabler
->chan
, NULL
);
1965 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1969 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
1971 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
1976 * Create struct lttng_event if it is missing and present in the list of
1977 * tracepoint probes.
1978 * Should be called with sessions mutex held.
1981 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1983 switch (event_enabler
->base
.event_param
.instrumentation
) {
1984 case LTTNG_KERNEL_TRACEPOINT
:
1985 lttng_create_tracepoint_event_if_missing(event_enabler
);
1987 case LTTNG_KERNEL_SYSCALL
:
1988 lttng_create_syscall_event_if_missing(event_enabler
);
1997 * Create events associated with an event_enabler (if not already present),
1998 * and add backward reference from the event to the enabler.
1999 * Should be called with sessions mutex held.
2002 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2004 struct lttng_channel
*chan
= event_enabler
->chan
;
2005 struct lttng_session
*session
= event_enabler
->chan
->session
;
2006 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2007 struct lttng_event
*event
;
2009 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2010 base_enabler
->event_param
.u
.syscall
.entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
&&
2011 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2012 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2013 !strcmp(base_enabler
->event_param
.name
, "*")) {
2014 if (base_enabler
->enabled
)
2015 WRITE_ONCE(chan
->syscall_all
, 1);
2017 WRITE_ONCE(chan
->syscall_all
, 0);
2020 /* First ensure that probe events are created for this enabler. */
2021 lttng_create_event_if_missing(event_enabler
);
2023 /* For each event matching event_enabler in session event list. */
2024 list_for_each_entry(event
, &session
->events
, list
) {
2025 struct lttng_enabler_ref
*enabler_ref
;
2027 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2029 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2030 lttng_event_enabler_as_enabler(event_enabler
));
2033 * If no backward ref, create it.
2034 * Add backward ref from event to event_enabler.
2036 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2039 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2040 list_add(&enabler_ref
->node
,
2041 &event
->enablers_ref_head
);
2045 * Link filter bytecodes if not linked yet.
2047 lttng_enabler_link_bytecode(event
->desc
,
2049 &event
->filter_bytecode_runtime_head
,
2050 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2052 /* TODO: merge event context. */
2058 * Create struct lttng_event_notifier if it is missing and present in the list of
2059 * tracepoint probes.
2060 * Should be called with sessions mutex held.
2063 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2065 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2066 case LTTNG_KERNEL_TRACEPOINT
:
2067 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2069 case LTTNG_KERNEL_SYSCALL
:
2070 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2079 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2082 int lttng_event_notifier_enabler_ref_event_notifiers(
2083 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2085 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2086 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2087 struct lttng_event_notifier
*event_notifier
;
2089 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2090 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2091 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2092 !strcmp(base_enabler
->event_param
.name
, "*")) {
2094 int enabled
= base_enabler
->enabled
;
2095 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2097 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2098 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2100 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2101 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2105 /* First ensure that probe event_notifiers are created for this enabler. */
2106 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2108 /* Link the created event_notifier with its associated enabler. */
2109 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2110 struct lttng_enabler_ref
*enabler_ref
;
2112 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2115 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2116 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2119 * If no backward ref, create it.
2120 * Add backward ref from event_notifier to enabler.
2122 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2126 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2127 event_notifier_enabler
);
2128 list_add(&enabler_ref
->node
,
2129 &event_notifier
->enablers_ref_head
);
2133 * Link filter bytecodes if not linked yet.
2135 lttng_enabler_link_bytecode(event_notifier
->desc
,
2136 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2137 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2139 /* Link capture bytecodes if not linked yet. */
2140 lttng_enabler_link_bytecode(event_notifier
->desc
,
2141 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2142 &event_notifier_enabler
->capture_bytecode_head
);
2144 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2150 * Called at module load: connect the probe on all enablers matching
2152 * Called with sessions lock held.
2154 int lttng_fix_pending_events(void)
2156 struct lttng_session
*session
;
2158 list_for_each_entry(session
, &sessions
, list
)
2159 lttng_session_lazy_sync_event_enablers(session
);
2163 static bool lttng_event_notifier_group_has_active_event_notifiers(
2164 struct lttng_event_notifier_group
*event_notifier_group
)
2166 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2168 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2170 if (event_notifier_enabler
->base
.enabled
)
2176 bool lttng_event_notifier_active(void)
2178 struct lttng_event_notifier_group
*event_notifier_group
;
2180 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2181 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2187 int lttng_fix_pending_event_notifiers(void)
2189 struct lttng_event_notifier_group
*event_notifier_group
;
2191 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2192 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2196 struct lttng_event_enabler
*lttng_event_enabler_create(
2197 enum lttng_enabler_format_type format_type
,
2198 struct lttng_kernel_event
*event_param
,
2199 struct lttng_channel
*chan
)
2201 struct lttng_event_enabler
*event_enabler
;
2203 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2206 event_enabler
->base
.format_type
= format_type
;
2207 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2208 memcpy(&event_enabler
->base
.event_param
, event_param
,
2209 sizeof(event_enabler
->base
.event_param
));
2210 event_enabler
->chan
= chan
;
2212 event_enabler
->base
.enabled
= 0;
2213 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2214 mutex_lock(&sessions_mutex
);
2215 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2216 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2217 mutex_unlock(&sessions_mutex
);
2218 return event_enabler
;
2221 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2223 mutex_lock(&sessions_mutex
);
2224 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2225 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2226 mutex_unlock(&sessions_mutex
);
2230 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2232 mutex_lock(&sessions_mutex
);
2233 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2234 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2235 mutex_unlock(&sessions_mutex
);
2240 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2241 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2243 struct lttng_bytecode_node
*bytecode_node
;
2244 uint32_t bytecode_len
;
2247 ret
= get_user(bytecode_len
, &bytecode
->len
);
2250 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2254 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2255 sizeof(*bytecode
) + bytecode_len
);
2259 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2260 bytecode_node
->enabler
= enabler
;
2261 /* Enforce length based on allocated size */
2262 bytecode_node
->bc
.len
= bytecode_len
;
2263 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2268 lttng_kvfree(bytecode_node
);
2272 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2273 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2276 ret
= lttng_enabler_attach_filter_bytecode(
2277 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2281 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2288 int lttng_event_add_callsite(struct lttng_event
*event
,
2289 struct lttng_kernel_event_callsite __user
*callsite
)
2292 switch (event
->instrumentation
) {
2293 case LTTNG_KERNEL_UPROBE
:
2294 return lttng_uprobes_event_add_callsite(event
, callsite
);
2300 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2301 struct lttng_kernel_context
*context_param
)
2307 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2309 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2311 /* Destroy filter bytecode */
2312 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2313 &enabler
->filter_bytecode_head
, node
) {
2314 lttng_kvfree(filter_node
);
2319 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2321 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2323 /* Destroy contexts */
2324 lttng_destroy_context(event_enabler
->ctx
);
2326 list_del(&event_enabler
->node
);
2327 kfree(event_enabler
);
2330 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2331 struct lttng_event_notifier_group
*event_notifier_group
,
2332 enum lttng_enabler_format_type format_type
,
2333 struct lttng_kernel_event_notifier
*event_notifier_param
)
2335 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2337 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2338 if (!event_notifier_enabler
)
2341 event_notifier_enabler
->base
.format_type
= format_type
;
2342 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2343 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2345 event_notifier_enabler
->num_captures
= 0;
2347 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2348 sizeof(event_notifier_enabler
->base
.event_param
));
2349 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2351 event_notifier_enabler
->base
.enabled
= 0;
2352 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2353 event_notifier_enabler
->group
= event_notifier_group
;
2355 mutex_lock(&sessions_mutex
);
2356 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2357 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2359 mutex_unlock(&sessions_mutex
);
2361 return event_notifier_enabler
;
2364 int lttng_event_notifier_enabler_enable(
2365 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2367 mutex_lock(&sessions_mutex
);
2368 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2369 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2370 mutex_unlock(&sessions_mutex
);
2374 int lttng_event_notifier_enabler_disable(
2375 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2377 mutex_lock(&sessions_mutex
);
2378 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2379 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2380 mutex_unlock(&sessions_mutex
);
2384 int lttng_event_notifier_enabler_attach_filter_bytecode(
2385 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2386 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2390 ret
= lttng_enabler_attach_filter_bytecode(
2391 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2396 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2403 int lttng_event_notifier_enabler_attach_capture_bytecode(
2404 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2405 struct lttng_kernel_capture_bytecode __user
*bytecode
)
2407 struct lttng_bytecode_node
*bytecode_node
;
2408 struct lttng_enabler
*enabler
=
2409 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2410 uint32_t bytecode_len
;
2413 ret
= get_user(bytecode_len
, &bytecode
->len
);
2417 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2422 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2423 sizeof(*bytecode
) + bytecode_len
);
2427 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2428 bytecode_node
->enabler
= enabler
;
2430 /* Enforce length based on allocated size */
2431 bytecode_node
->bc
.len
= bytecode_len
;
2432 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2434 event_notifier_enabler
->num_captures
++;
2436 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2440 lttng_kvfree(bytecode_node
);
2445 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2446 struct lttng_kernel_event_callsite __user
*callsite
)
2449 switch (event_notifier
->instrumentation
) {
2450 case LTTNG_KERNEL_UPROBE
:
2451 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2458 int lttng_event_notifier_enabler_attach_context(
2459 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2460 struct lttng_kernel_context
*context_param
)
2466 void lttng_event_notifier_enabler_destroy(
2467 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2469 if (!event_notifier_enabler
) {
2473 list_del(&event_notifier_enabler
->node
);
2475 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2476 kfree(event_notifier_enabler
);
2480 * lttng_session_sync_event_enablers should be called just before starting a
2482 * Should be called with sessions mutex held.
2485 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2487 struct lttng_event_enabler
*event_enabler
;
2488 struct lttng_event
*event
;
2490 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2491 lttng_event_enabler_ref_events(event_enabler
);
2493 * For each event, if at least one of its enablers is enabled,
2494 * and its channel and session transient states are enabled, we
2495 * enable the event, else we disable it.
2497 list_for_each_entry(event
, &session
->events
, list
) {
2498 struct lttng_enabler_ref
*enabler_ref
;
2499 struct lttng_bytecode_runtime
*runtime
;
2500 int enabled
= 0, has_enablers_without_bytecode
= 0;
2502 switch (event
->instrumentation
) {
2503 case LTTNG_KERNEL_TRACEPOINT
:
2504 case LTTNG_KERNEL_SYSCALL
:
2506 list_for_each_entry(enabler_ref
,
2507 &event
->enablers_ref_head
, node
) {
2508 if (enabler_ref
->ref
->enabled
) {
2515 /* Not handled with lazy sync. */
2519 * Enabled state is based on union of enablers, with
2520 * intesection of session and channel transient enable
2523 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2525 WRITE_ONCE(event
->enabled
, enabled
);
2527 * Sync tracepoint registration with event enabled
2531 register_event(event
);
2533 _lttng_event_unregister(event
);
2536 /* Check if has enablers without bytecode enabled */
2537 list_for_each_entry(enabler_ref
,
2538 &event
->enablers_ref_head
, node
) {
2539 if (enabler_ref
->ref
->enabled
2540 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2541 has_enablers_without_bytecode
= 1;
2545 event
->has_enablers_without_bytecode
=
2546 has_enablers_without_bytecode
;
2548 /* Enable filters */
2549 list_for_each_entry(runtime
,
2550 &event
->filter_bytecode_runtime_head
, node
)
2551 lttng_bytecode_filter_sync_state(runtime
);
2556 * Apply enablers to session events, adding events to session if need
2557 * be. It is required after each modification applied to an active
2558 * session, and right before session "start".
2559 * "lazy" sync means we only sync if required.
2560 * Should be called with sessions mutex held.
2563 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2565 /* We can skip if session is not active */
2566 if (!session
->active
)
2568 lttng_session_sync_event_enablers(session
);
2572 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2574 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2575 struct lttng_event_notifier
*event_notifier
;
2577 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2578 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2581 * For each event_notifier, if at least one of its enablers is enabled,
2582 * we enable the event_notifier, else we disable it.
2584 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2585 struct lttng_enabler_ref
*enabler_ref
;
2586 struct lttng_bytecode_runtime
*runtime
;
2587 int enabled
= 0, has_enablers_without_bytecode
= 0;
2589 switch (event_notifier
->instrumentation
) {
2590 case LTTNG_KERNEL_TRACEPOINT
:
2591 case LTTNG_KERNEL_SYSCALL
:
2592 /* Enable event_notifiers */
2593 list_for_each_entry(enabler_ref
,
2594 &event_notifier
->enablers_ref_head
, node
) {
2595 if (enabler_ref
->ref
->enabled
) {
2602 /* Not handled with sync. */
2606 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2608 * Sync tracepoint registration with event_notifier enabled
2612 if (!event_notifier
->registered
)
2613 register_event_notifier(event_notifier
);
2615 if (event_notifier
->registered
)
2616 _lttng_event_notifier_unregister(event_notifier
);
2619 /* Check if has enablers without bytecode enabled */
2620 list_for_each_entry(enabler_ref
,
2621 &event_notifier
->enablers_ref_head
, node
) {
2622 if (enabler_ref
->ref
->enabled
2623 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2624 has_enablers_without_bytecode
= 1;
2628 event_notifier
->has_enablers_without_bytecode
=
2629 has_enablers_without_bytecode
;
2631 /* Enable filters */
2632 list_for_each_entry(runtime
,
2633 &event_notifier
->filter_bytecode_runtime_head
, node
)
2634 lttng_bytecode_filter_sync_state(runtime
);
2636 /* Enable captures */
2637 list_for_each_entry(runtime
,
2638 &event_notifier
->capture_bytecode_runtime_head
, node
)
2639 lttng_bytecode_capture_sync_state(runtime
);
2644 * Serialize at most one packet worth of metadata into a metadata
2646 * We grab the metadata cache mutex to get exclusive access to our metadata
2647 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2648 * allows us to do racy operations such as looking for remaining space left in
2649 * packet and write, since mutual exclusion protects us from concurrent writes.
2650 * Mutual exclusion on the metadata cache allow us to read the cache content
2651 * without racing against reallocation of the cache by updates.
2652 * Returns the number of bytes written in the channel, 0 if no data
2653 * was written and a negative value on error.
2655 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2656 struct channel
*chan
, bool *coherent
)
2658 struct lib_ring_buffer_ctx ctx
;
2660 size_t len
, reserve_len
;
2663 * Ensure we support mutiple get_next / put sequences followed by
2664 * put_next. The metadata cache lock protects reading the metadata
2665 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2666 * "flush" operations on the buffer invoked by different processes.
2667 * Moreover, since the metadata cache memory can be reallocated, we
2668 * need to have exclusive access against updates even though we only
2671 mutex_lock(&stream
->metadata_cache
->lock
);
2672 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2673 if (stream
->metadata_in
!= stream
->metadata_out
)
2676 /* Metadata regenerated, change the version. */
2677 if (stream
->metadata_cache
->version
!= stream
->version
)
2678 stream
->version
= stream
->metadata_cache
->version
;
2680 len
= stream
->metadata_cache
->metadata_written
-
2681 stream
->metadata_in
;
2684 reserve_len
= min_t(size_t,
2685 stream
->transport
->ops
.packet_avail_size(chan
),
2687 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2690 * If reservation failed, return an error to the caller.
2692 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2694 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2695 stream
->coherent
= false;
2698 stream
->transport
->ops
.event_write(&ctx
,
2699 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2701 stream
->transport
->ops
.event_commit(&ctx
);
2702 stream
->metadata_in
+= reserve_len
;
2703 if (reserve_len
< len
)
2704 stream
->coherent
= false;
2706 stream
->coherent
= true;
2711 *coherent
= stream
->coherent
;
2712 mutex_unlock(&stream
->metadata_cache
->lock
);
2717 void lttng_metadata_begin(struct lttng_session
*session
)
2719 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2720 mutex_lock(&session
->metadata_cache
->lock
);
2724 void lttng_metadata_end(struct lttng_session
*session
)
2726 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2727 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2728 struct lttng_metadata_stream
*stream
;
2730 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2731 wake_up_interruptible(&stream
->read_wait
);
2732 mutex_unlock(&session
->metadata_cache
->lock
);
2737 * Write the metadata to the metadata cache.
2738 * Must be called with sessions_mutex held.
2739 * The metadata cache lock protects us from concurrent read access from
2740 * thread outputting metadata content to ring buffer.
2741 * The content of the printf is printed as a single atomic metadata
2744 int lttng_metadata_printf(struct lttng_session
*session
,
2745 const char *fmt
, ...)
2751 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2754 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2760 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2761 if (session
->metadata_cache
->metadata_written
+ len
>
2762 session
->metadata_cache
->cache_alloc
) {
2763 char *tmp_cache_realloc
;
2764 unsigned int tmp_cache_alloc_size
;
2766 tmp_cache_alloc_size
= max_t(unsigned int,
2767 session
->metadata_cache
->cache_alloc
+ len
,
2768 session
->metadata_cache
->cache_alloc
<< 1);
2769 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2770 if (!tmp_cache_realloc
)
2772 if (session
->metadata_cache
->data
) {
2773 memcpy(tmp_cache_realloc
,
2774 session
->metadata_cache
->data
,
2775 session
->metadata_cache
->cache_alloc
);
2776 vfree(session
->metadata_cache
->data
);
2779 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2780 session
->metadata_cache
->data
= tmp_cache_realloc
;
2782 memcpy(session
->metadata_cache
->data
+
2783 session
->metadata_cache
->metadata_written
,
2785 session
->metadata_cache
->metadata_written
+= len
;
2796 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2800 for (i
= 0; i
< nesting
; i
++) {
2803 ret
= lttng_metadata_printf(session
, " ");
2812 int lttng_field_name_statedump(struct lttng_session
*session
,
2813 const struct lttng_event_field
*field
,
2816 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2820 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2821 const struct lttng_type
*type
,
2826 WARN_ON_ONCE(type
->atype
!= atype_integer
);
2827 ret
= print_tabs(session
, nesting
);
2830 ret
= lttng_metadata_printf(session
,
2831 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2832 type
->u
.integer
.size
,
2833 type
->u
.integer
.alignment
,
2834 type
->u
.integer
.signedness
,
2835 (type
->u
.integer
.encoding
== lttng_encode_none
)
2837 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
2840 type
->u
.integer
.base
,
2841 #if __BYTE_ORDER == __BIG_ENDIAN
2842 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
2844 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
2851 * Must be called with sessions_mutex held.
2854 int _lttng_struct_type_statedump(struct lttng_session
*session
,
2855 const struct lttng_type
*type
,
2859 uint32_t i
, nr_fields
;
2860 unsigned int alignment
;
2862 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
2864 ret
= print_tabs(session
, nesting
);
2867 ret
= lttng_metadata_printf(session
,
2871 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
2872 for (i
= 0; i
< nr_fields
; i
++) {
2873 const struct lttng_event_field
*iter_field
;
2875 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
2876 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2880 ret
= print_tabs(session
, nesting
);
2883 alignment
= type
->u
.struct_nestable
.alignment
;
2885 ret
= lttng_metadata_printf(session
,
2889 ret
= lttng_metadata_printf(session
,
2896 * Must be called with sessions_mutex held.
2899 int _lttng_struct_field_statedump(struct lttng_session
*session
,
2900 const struct lttng_event_field
*field
,
2905 ret
= _lttng_struct_type_statedump(session
,
2906 &field
->type
, nesting
);
2909 return lttng_field_name_statedump(session
, field
, nesting
);
2913 * Must be called with sessions_mutex held.
2916 int _lttng_variant_type_statedump(struct lttng_session
*session
,
2917 const struct lttng_type
*type
,
2921 uint32_t i
, nr_choices
;
2923 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
2925 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2927 if (type
->u
.variant_nestable
.alignment
!= 0)
2929 ret
= print_tabs(session
, nesting
);
2932 ret
= lttng_metadata_printf(session
,
2933 "variant <_%s> {\n",
2934 type
->u
.variant_nestable
.tag_name
);
2937 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
2938 for (i
= 0; i
< nr_choices
; i
++) {
2939 const struct lttng_event_field
*iter_field
;
2941 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
2942 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2946 ret
= print_tabs(session
, nesting
);
2949 ret
= lttng_metadata_printf(session
,
2955 * Must be called with sessions_mutex held.
2958 int _lttng_variant_field_statedump(struct lttng_session
*session
,
2959 const struct lttng_event_field
*field
,
2964 ret
= _lttng_variant_type_statedump(session
,
2965 &field
->type
, nesting
);
2968 return lttng_field_name_statedump(session
, field
, nesting
);
2972 * Must be called with sessions_mutex held.
2975 int _lttng_array_field_statedump(struct lttng_session
*session
,
2976 const struct lttng_event_field
*field
,
2980 const struct lttng_type
*elem_type
;
2982 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
2984 if (field
->type
.u
.array_nestable
.alignment
) {
2985 ret
= print_tabs(session
, nesting
);
2988 ret
= lttng_metadata_printf(session
,
2989 "struct { } align(%u) _%s_padding;\n",
2990 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
2996 * Nested compound types: Only array of structures and variants are
2997 * currently supported.
2999 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
3000 switch (elem_type
->atype
) {
3002 case atype_struct_nestable
:
3003 case atype_variant_nestable
:
3004 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3012 ret
= lttng_metadata_printf(session
,
3015 field
->type
.u
.array_nestable
.length
);
3020 * Must be called with sessions_mutex held.
3023 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3024 const struct lttng_event_field
*field
,
3028 const char *length_name
;
3029 const struct lttng_type
*elem_type
;
3031 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
3033 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
3035 if (field
->type
.u
.sequence_nestable
.alignment
) {
3036 ret
= print_tabs(session
, nesting
);
3039 ret
= lttng_metadata_printf(session
,
3040 "struct { } align(%u) _%s_padding;\n",
3041 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
3048 * Nested compound types: Only array of structures and variants are
3049 * currently supported.
3051 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
3052 switch (elem_type
->atype
) {
3054 case atype_struct_nestable
:
3055 case atype_variant_nestable
:
3056 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3064 ret
= lttng_metadata_printf(session
,
3067 field
->type
.u
.sequence_nestable
.length_name
);
3072 * Must be called with sessions_mutex held.
3075 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3076 const struct lttng_type
*type
,
3079 const struct lttng_enum_desc
*enum_desc
;
3080 const struct lttng_type
*container_type
;
3082 unsigned int i
, nr_entries
;
3084 container_type
= type
->u
.enum_nestable
.container_type
;
3085 if (container_type
->atype
!= atype_integer
) {
3089 enum_desc
= type
->u
.enum_nestable
.desc
;
3090 nr_entries
= enum_desc
->nr_entries
;
3092 ret
= print_tabs(session
, nesting
);
3095 ret
= lttng_metadata_printf(session
, "enum : ");
3098 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
3101 ret
= lttng_metadata_printf(session
, " {\n");
3104 /* Dump all entries */
3105 for (i
= 0; i
< nr_entries
; i
++) {
3106 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
3109 ret
= print_tabs(session
, nesting
+ 1);
3112 ret
= lttng_metadata_printf(session
,
3116 len
= strlen(entry
->string
);
3117 /* Escape the character '"' */
3118 for (j
= 0; j
< len
; j
++) {
3119 char c
= entry
->string
[j
];
3123 ret
= lttng_metadata_printf(session
,
3127 ret
= lttng_metadata_printf(session
,
3131 ret
= lttng_metadata_printf(session
,
3138 ret
= lttng_metadata_printf(session
, "\"");
3142 if (entry
->options
.is_auto
) {
3143 ret
= lttng_metadata_printf(session
, ",\n");
3147 ret
= lttng_metadata_printf(session
,
3151 if (entry
->start
.signedness
)
3152 ret
= lttng_metadata_printf(session
,
3153 "%lld", (long long) entry
->start
.value
);
3155 ret
= lttng_metadata_printf(session
,
3156 "%llu", entry
->start
.value
);
3159 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3161 == entry
->end
.value
) {
3162 ret
= lttng_metadata_printf(session
,
3165 if (entry
->end
.signedness
) {
3166 ret
= lttng_metadata_printf(session
,
3168 (long long) entry
->end
.value
);
3170 ret
= lttng_metadata_printf(session
,
3179 ret
= print_tabs(session
, nesting
);
3182 ret
= lttng_metadata_printf(session
, "}");
3188 * Must be called with sessions_mutex held.
3191 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3192 const struct lttng_event_field
*field
,
3197 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3200 return lttng_field_name_statedump(session
, field
, nesting
);
3204 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3205 const struct lttng_event_field
*field
,
3210 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3213 return lttng_field_name_statedump(session
, field
, nesting
);
3217 int _lttng_string_type_statedump(struct lttng_session
*session
,
3218 const struct lttng_type
*type
,
3223 WARN_ON_ONCE(type
->atype
!= atype_string
);
3224 /* Default encoding is UTF8 */
3225 ret
= print_tabs(session
, nesting
);
3228 ret
= lttng_metadata_printf(session
,
3230 type
->u
.string
.encoding
== lttng_encode_ASCII
?
3231 " { encoding = ASCII; }" : "");
3236 int _lttng_string_field_statedump(struct lttng_session
*session
,
3237 const struct lttng_event_field
*field
,
3242 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
3243 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3246 return lttng_field_name_statedump(session
, field
, nesting
);
3250 * Must be called with sessions_mutex held.
3253 int _lttng_type_statedump(struct lttng_session
*session
,
3254 const struct lttng_type
*type
,
3259 switch (type
->atype
) {
3261 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3263 case atype_enum_nestable
:
3264 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3267 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3269 case atype_struct_nestable
:
3270 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3272 case atype_variant_nestable
:
3273 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3276 /* Nested arrays and sequences are not supported yet. */
3277 case atype_array_nestable
:
3278 case atype_sequence_nestable
:
3287 * Must be called with sessions_mutex held.
3290 int _lttng_field_statedump(struct lttng_session
*session
,
3291 const struct lttng_event_field
*field
,
3296 switch (field
->type
.atype
) {
3298 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3300 case atype_enum_nestable
:
3301 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3304 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3306 case atype_struct_nestable
:
3307 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3309 case atype_array_nestable
:
3310 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3312 case atype_sequence_nestable
:
3313 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3315 case atype_variant_nestable
:
3316 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3327 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3328 struct lttng_ctx
*ctx
)
3335 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3336 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3338 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3346 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3347 struct lttng_event
*event
)
3349 const struct lttng_event_desc
*desc
= event
->desc
;
3353 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3354 const struct lttng_event_field
*field
= &desc
->fields
[i
];
3356 ret
= _lttng_field_statedump(session
, field
, 2);
3364 * Must be called with sessions_mutex held.
3365 * The entire event metadata is printed as a single atomic metadata
3369 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3370 struct lttng_channel
*chan
,
3371 struct lttng_event
*event
)
3375 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3377 if (chan
->channel_type
== METADATA_CHANNEL
)
3380 lttng_metadata_begin(session
);
3382 ret
= lttng_metadata_printf(session
,
3386 " stream_id = %u;\n",
3394 ret
= lttng_metadata_printf(session
,
3395 " context := struct {\n");
3399 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3403 ret
= lttng_metadata_printf(session
,
3409 ret
= lttng_metadata_printf(session
,
3410 " fields := struct {\n"
3415 ret
= _lttng_fields_metadata_statedump(session
, event
);
3420 * LTTng space reservation can only reserve multiples of the
3423 ret
= lttng_metadata_printf(session
,
3429 event
->metadata_dumped
= 1;
3431 lttng_metadata_end(session
);
3437 * Must be called with sessions_mutex held.
3438 * The entire channel metadata is printed as a single atomic metadata
3442 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3443 struct lttng_channel
*chan
)
3447 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3450 if (chan
->channel_type
== METADATA_CHANNEL
)
3453 lttng_metadata_begin(session
);
3455 WARN_ON_ONCE(!chan
->header_type
);
3456 ret
= lttng_metadata_printf(session
,
3459 " event.header := %s;\n"
3460 " packet.context := struct packet_context;\n",
3462 chan
->header_type
== 1 ? "struct event_header_compact" :
3463 "struct event_header_large");
3468 ret
= lttng_metadata_printf(session
,
3469 " event.context := struct {\n");
3473 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3477 ret
= lttng_metadata_printf(session
,
3483 ret
= lttng_metadata_printf(session
,
3486 chan
->metadata_dumped
= 1;
3488 lttng_metadata_end(session
);
3493 * Must be called with sessions_mutex held.
3496 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3498 return lttng_metadata_printf(session
,
3499 "struct packet_context {\n"
3500 " uint64_clock_monotonic_t timestamp_begin;\n"
3501 " uint64_clock_monotonic_t timestamp_end;\n"
3502 " uint64_t content_size;\n"
3503 " uint64_t packet_size;\n"
3504 " uint64_t packet_seq_num;\n"
3505 " unsigned long events_discarded;\n"
3506 " uint32_t cpu_id;\n"
3513 * id: range: 0 - 30.
3514 * id 31 is reserved to indicate an extended header.
3517 * id: range: 0 - 65534.
3518 * id 65535 is reserved to indicate an extended header.
3520 * Must be called with sessions_mutex held.
3523 int _lttng_event_header_declare(struct lttng_session
*session
)
3525 return lttng_metadata_printf(session
,
3526 "struct event_header_compact {\n"
3527 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3530 " uint27_clock_monotonic_t timestamp;\n"
3534 " uint64_clock_monotonic_t timestamp;\n"
3539 "struct event_header_large {\n"
3540 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3543 " uint32_clock_monotonic_t timestamp;\n"
3547 " uint64_clock_monotonic_t timestamp;\n"
3551 lttng_alignof(uint32_t) * CHAR_BIT
,
3552 lttng_alignof(uint16_t) * CHAR_BIT
3557 * Approximation of NTP time of day to clock monotonic correlation,
3558 * taken at start of trace.
3559 * Yes, this is only an approximation. Yes, we can (and will) do better
3560 * in future versions.
3561 * This function may return a negative offset. It may happen if the
3562 * system sets the REALTIME clock to 0 after boot.
3564 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3568 int64_t measure_clock_offset(void)
3570 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3571 uint64_t tcf
= trace_clock_freq();
3573 unsigned long flags
;
3574 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3575 struct timespec64 rts
= { 0, 0 };
3577 struct timespec rts
= { 0, 0 };
3580 /* Disable interrupts to increase correlation precision. */
3581 local_irq_save(flags
);
3582 monotonic
[0] = trace_clock_read64();
3583 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3584 ktime_get_real_ts64(&rts
);
3586 getnstimeofday(&rts
);
3588 monotonic
[1] = trace_clock_read64();
3589 local_irq_restore(flags
);
3591 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3592 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3593 if (tcf
== NSEC_PER_SEC
) {
3594 realtime
+= rts
.tv_nsec
;
3596 uint64_t n
= rts
.tv_nsec
* tcf
;
3598 do_div(n
, NSEC_PER_SEC
);
3601 offset
= (int64_t) realtime
- monotonic_avg
;
3606 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3614 while (cur
!= '\0') {
3617 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3621 ret
= lttng_metadata_printf(session
, "%c", '\\');
3624 /* We still print the current char */
3627 ret
= lttng_metadata_printf(session
, "%c", cur
);
3641 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3642 const char *field_value
)
3646 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3650 ret
= print_escaped_ctf_string(session
, field_value
);
3654 ret
= lttng_metadata_printf(session
, "\";\n");
3661 * Output metadata into this session's metadata buffers.
3662 * Must be called with sessions_mutex held.
3665 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3667 unsigned char *uuid_c
= session
->uuid
.b
;
3668 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3669 const char *product_uuid
;
3670 struct lttng_channel
*chan
;
3671 struct lttng_event
*event
;
3674 if (!LTTNG_READ_ONCE(session
->active
))
3677 lttng_metadata_begin(session
);
3679 if (session
->metadata_dumped
)
3682 snprintf(uuid_s
, sizeof(uuid_s
),
3683 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3684 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3685 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3686 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3687 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3689 ret
= lttng_metadata_printf(session
,
3690 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3691 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3692 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3693 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3694 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3695 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3696 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3702 " byte_order = %s;\n"
3703 " packet.header := struct {\n"
3704 " uint32_t magic;\n"
3705 " uint8_t uuid[16];\n"
3706 " uint32_t stream_id;\n"
3707 " uint64_t stream_instance_id;\n"
3710 lttng_alignof(uint8_t) * CHAR_BIT
,
3711 lttng_alignof(uint16_t) * CHAR_BIT
,
3712 lttng_alignof(uint32_t) * CHAR_BIT
,
3713 lttng_alignof(uint64_t) * CHAR_BIT
,
3714 sizeof(unsigned long) * CHAR_BIT
,
3715 lttng_alignof(unsigned long) * CHAR_BIT
,
3719 #if __BYTE_ORDER == __BIG_ENDIAN
3728 ret
= lttng_metadata_printf(session
,
3730 " hostname = \"%s\";\n"
3731 " domain = \"kernel\";\n"
3732 " sysname = \"%s\";\n"
3733 " kernel_release = \"%s\";\n"
3734 " kernel_version = \"%s\";\n"
3735 " tracer_name = \"lttng-modules\";\n"
3736 " tracer_major = %d;\n"
3737 " tracer_minor = %d;\n"
3738 " tracer_patchlevel = %d;\n"
3739 " trace_buffering_scheme = \"global\";\n",
3740 current
->nsproxy
->uts_ns
->name
.nodename
,
3744 LTTNG_MODULES_MAJOR_VERSION
,
3745 LTTNG_MODULES_MINOR_VERSION
,
3746 LTTNG_MODULES_PATCHLEVEL_VERSION
3751 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3754 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3755 session
->creation_time
);
3759 /* Add the product UUID to the 'env' section */
3760 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3762 ret
= lttng_metadata_printf(session
,
3763 " product_uuid = \"%s\";\n",
3770 /* Close the 'env' section */
3771 ret
= lttng_metadata_printf(session
, "};\n\n");
3775 ret
= lttng_metadata_printf(session
,
3777 " name = \"%s\";\n",
3783 if (!trace_clock_uuid(clock_uuid_s
)) {
3784 ret
= lttng_metadata_printf(session
,
3785 " uuid = \"%s\";\n",
3792 ret
= lttng_metadata_printf(session
,
3793 " description = \"%s\";\n"
3794 " freq = %llu; /* Frequency, in Hz */\n"
3795 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3798 trace_clock_description(),
3799 (unsigned long long) trace_clock_freq(),
3800 (long long) measure_clock_offset()
3805 ret
= lttng_metadata_printf(session
,
3806 "typealias integer {\n"
3807 " size = 27; align = 1; signed = false;\n"
3808 " map = clock.%s.value;\n"
3809 "} := uint27_clock_monotonic_t;\n"
3811 "typealias integer {\n"
3812 " size = 32; align = %u; signed = false;\n"
3813 " map = clock.%s.value;\n"
3814 "} := uint32_clock_monotonic_t;\n"
3816 "typealias integer {\n"
3817 " size = 64; align = %u; signed = false;\n"
3818 " map = clock.%s.value;\n"
3819 "} := uint64_clock_monotonic_t;\n\n",
3821 lttng_alignof(uint32_t) * CHAR_BIT
,
3823 lttng_alignof(uint64_t) * CHAR_BIT
,
3829 ret
= _lttng_stream_packet_context_declare(session
);
3833 ret
= _lttng_event_header_declare(session
);
3838 list_for_each_entry(chan
, &session
->chan
, list
) {
3839 ret
= _lttng_channel_metadata_statedump(session
, chan
);
3844 list_for_each_entry(event
, &session
->events
, list
) {
3845 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
3849 session
->metadata_dumped
= 1;
3851 lttng_metadata_end(session
);
3856 * lttng_transport_register - LTT transport registration
3857 * @transport: transport structure
3859 * Registers a transport which can be used as output to extract the data out of
3860 * LTTng. The module calling this registration function must ensure that no
3861 * trap-inducing code will be executed by the transport functions. E.g.
3862 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3863 * is made visible to the transport function. This registration acts as a
3864 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3865 * after its registration must it synchronize the TLBs.
3867 void lttng_transport_register(struct lttng_transport
*transport
)
3870 * Make sure no page fault can be triggered by the module about to be
3871 * registered. We deal with this here so we don't have to call
3872 * vmalloc_sync_mappings() in each module's init.
3874 wrapper_vmalloc_sync_mappings();
3876 mutex_lock(&sessions_mutex
);
3877 list_add_tail(&transport
->node
, <tng_transport_list
);
3878 mutex_unlock(&sessions_mutex
);
3880 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3883 * lttng_transport_unregister - LTT transport unregistration
3884 * @transport: transport structure
3886 void lttng_transport_unregister(struct lttng_transport
*transport
)
3888 mutex_lock(&sessions_mutex
);
3889 list_del(&transport
->node
);
3890 mutex_unlock(&sessions_mutex
);
3892 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
3894 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
3897 * Make sure no page fault can be triggered by the module about to be
3898 * registered. We deal with this here so we don't have to call
3899 * vmalloc_sync_mappings() in each module's init.
3901 wrapper_vmalloc_sync_mappings();
3903 mutex_lock(&sessions_mutex
);
3904 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
3905 mutex_unlock(&sessions_mutex
);
3907 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
3909 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
3911 mutex_lock(&sessions_mutex
);
3912 list_del(&transport
->node
);
3913 mutex_unlock(&sessions_mutex
);
3915 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
3917 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
3919 enum cpuhp_state lttng_hp_prepare
;
3920 enum cpuhp_state lttng_hp_online
;
3922 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
3924 struct lttng_cpuhp_node
*lttng_node
;
3926 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3927 switch (lttng_node
->component
) {
3928 case LTTNG_RING_BUFFER_FRONTEND
:
3930 case LTTNG_RING_BUFFER_BACKEND
:
3931 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
3932 case LTTNG_RING_BUFFER_ITER
:
3934 case LTTNG_CONTEXT_PERF_COUNTERS
:
3941 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
3943 struct lttng_cpuhp_node
*lttng_node
;
3945 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3946 switch (lttng_node
->component
) {
3947 case LTTNG_RING_BUFFER_FRONTEND
:
3948 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
3949 case LTTNG_RING_BUFFER_BACKEND
:
3951 case LTTNG_RING_BUFFER_ITER
:
3953 case LTTNG_CONTEXT_PERF_COUNTERS
:
3954 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
3960 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
3962 struct lttng_cpuhp_node
*lttng_node
;
3964 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3965 switch (lttng_node
->component
) {
3966 case LTTNG_RING_BUFFER_FRONTEND
:
3967 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
3968 case LTTNG_RING_BUFFER_BACKEND
:
3970 case LTTNG_RING_BUFFER_ITER
:
3971 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
3972 case LTTNG_CONTEXT_PERF_COUNTERS
:
3973 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
3979 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
3981 struct lttng_cpuhp_node
*lttng_node
;
3983 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3984 switch (lttng_node
->component
) {
3985 case LTTNG_RING_BUFFER_FRONTEND
:
3986 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
3987 case LTTNG_RING_BUFFER_BACKEND
:
3989 case LTTNG_RING_BUFFER_ITER
:
3991 case LTTNG_CONTEXT_PERF_COUNTERS
:
3998 static int __init
lttng_init_cpu_hotplug(void)
4002 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4003 lttng_hotplug_prepare
,
4004 lttng_hotplug_dead
);
4008 lttng_hp_prepare
= ret
;
4009 lttng_rb_set_hp_prepare(ret
);
4011 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4012 lttng_hotplug_online
,
4013 lttng_hotplug_offline
);
4015 cpuhp_remove_multi_state(lttng_hp_prepare
);
4016 lttng_hp_prepare
= 0;
4019 lttng_hp_online
= ret
;
4020 lttng_rb_set_hp_online(ret
);
4025 static void __exit
lttng_exit_cpu_hotplug(void)
4027 lttng_rb_set_hp_online(0);
4028 cpuhp_remove_multi_state(lttng_hp_online
);
4029 lttng_rb_set_hp_prepare(0);
4030 cpuhp_remove_multi_state(lttng_hp_prepare
);
4033 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4034 static int lttng_init_cpu_hotplug(void)
4038 static void lttng_exit_cpu_hotplug(void)
4041 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4044 static int __init
lttng_events_init(void)
4048 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4051 ret
= wrapper_get_pfnblock_flags_mask_init();
4054 ret
= wrapper_get_pageblock_flags_mask_init();
4057 ret
= lttng_probes_init();
4060 ret
= lttng_context_init();
4063 ret
= lttng_tracepoint_init();
4066 event_cache
= KMEM_CACHE(lttng_event
, 0);
4069 goto error_kmem_event
;
4071 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4072 if (!event_notifier_cache
) {
4074 goto error_kmem_event_notifier
;
4076 ret
= lttng_abi_init();
4079 ret
= lttng_logger_init();
4082 ret
= lttng_init_cpu_hotplug();
4085 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4086 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4087 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4088 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4089 LTTNG_MODULES_EXTRAVERSION
,
4091 #ifdef LTTNG_EXTRA_VERSION_GIT
4092 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4096 #ifdef LTTNG_EXTRA_VERSION_NAME
4097 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4104 lttng_logger_exit();
4108 kmem_cache_destroy(event_notifier_cache
);
4109 error_kmem_event_notifier
:
4110 kmem_cache_destroy(event_cache
);
4112 lttng_tracepoint_exit();
4114 lttng_context_exit();
4115 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4116 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4117 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4118 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4119 LTTNG_MODULES_EXTRAVERSION
,
4121 #ifdef LTTNG_EXTRA_VERSION_GIT
4122 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4126 #ifdef LTTNG_EXTRA_VERSION_NAME
4127 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4134 module_init(lttng_events_init
);
4136 static void __exit
lttng_events_exit(void)
4138 struct lttng_session
*session
, *tmpsession
;
4140 lttng_exit_cpu_hotplug();
4141 lttng_logger_exit();
4143 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4144 lttng_session_destroy(session
);
4145 kmem_cache_destroy(event_cache
);
4146 kmem_cache_destroy(event_notifier_cache
);
4147 lttng_tracepoint_exit();
4148 lttng_context_exit();
4149 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4150 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4151 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4152 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4153 LTTNG_MODULES_EXTRAVERSION
,
4155 #ifdef LTTNG_EXTRA_VERSION_GIT
4156 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4160 #ifdef LTTNG_EXTRA_VERSION_NAME
4161 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4167 module_exit(lttng_events_exit
);
4169 #include <generated/patches.h>
4170 #ifdef LTTNG_EXTRA_VERSION_GIT
4171 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4173 #ifdef LTTNG_EXTRA_VERSION_NAME
4174 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4176 MODULE_LICENSE("GPL and additional rights");
4177 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4178 MODULE_DESCRIPTION("LTTng tracer");
4179 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4180 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4181 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4182 LTTNG_MODULES_EXTRAVERSION
);