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 (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
99 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
100 #ifdef CONFIG_PREEMPT_RT_FULL
103 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
104 #ifdef CONFIG_PREEMPT_RT
107 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_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
);
202 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
204 struct lttng_counter_transport
*transport
;
206 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
207 if (!strcmp(transport
->name
, name
))
213 struct lttng_counter
*lttng_kernel_counter_create(
214 const char *counter_transport_name
,
215 size_t number_dimensions
, const size_t *dimensions_sizes
)
217 struct lttng_counter
*counter
= NULL
;
218 struct lttng_counter_transport
*counter_transport
= NULL
;
220 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
221 if (!counter_transport
) {
222 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
223 counter_transport_name
);
226 if (!try_module_get(counter_transport
->owner
)) {
227 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
231 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
235 /* Create event notifier error counter. */
236 counter
->ops
= &counter_transport
->ops
;
237 counter
->transport
= counter_transport
;
239 counter
->counter
= counter
->ops
->counter_create(
240 number_dimensions
, dimensions_sizes
, 0);
241 if (!counter
->counter
) {
248 lttng_kvfree(counter
);
250 if (counter_transport
)
251 module_put(counter_transport
->owner
);
256 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
258 struct lttng_transport
*transport
= NULL
;
259 struct lttng_event_notifier_group
*event_notifier_group
;
260 const char *transport_name
= "relay-event-notifier";
261 size_t subbuf_size
= 4096; //TODO
262 size_t num_subbuf
= 16; //TODO
263 unsigned int switch_timer_interval
= 0;
264 unsigned int read_timer_interval
= 0;
267 mutex_lock(&sessions_mutex
);
269 transport
= lttng_transport_find(transport_name
);
271 printk(KERN_WARNING
"LTTng: transport %s not found\n",
275 if (!try_module_get(transport
->owner
)) {
276 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
281 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
283 if (!event_notifier_group
)
287 * Initialize the ring buffer used to store event notifier
290 event_notifier_group
->ops
= &transport
->ops
;
291 event_notifier_group
->chan
= transport
->ops
.channel_create(
292 transport_name
, event_notifier_group
, NULL
,
293 subbuf_size
, num_subbuf
, switch_timer_interval
,
294 read_timer_interval
);
295 if (!event_notifier_group
->chan
)
298 event_notifier_group
->transport
= transport
;
300 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
301 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
302 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
303 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
305 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
307 mutex_unlock(&sessions_mutex
);
309 return event_notifier_group
;
312 lttng_kvfree(event_notifier_group
);
315 module_put(transport
->owner
);
317 mutex_unlock(&sessions_mutex
);
321 void metadata_cache_destroy(struct kref
*kref
)
323 struct lttng_metadata_cache
*cache
=
324 container_of(kref
, struct lttng_metadata_cache
, refcount
);
329 void lttng_session_destroy(struct lttng_session
*session
)
331 struct lttng_channel
*chan
, *tmpchan
;
332 struct lttng_event
*event
, *tmpevent
;
333 struct lttng_metadata_stream
*metadata_stream
;
334 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
337 mutex_lock(&sessions_mutex
);
338 WRITE_ONCE(session
->active
, 0);
339 list_for_each_entry(chan
, &session
->chan
, list
) {
340 ret
= lttng_syscalls_unregister_channel(chan
);
343 list_for_each_entry(event
, &session
->events
, list
) {
344 ret
= _lttng_event_unregister(event
);
347 synchronize_trace(); /* Wait for in-flight events to complete */
348 list_for_each_entry(chan
, &session
->chan
, list
) {
349 ret
= lttng_syscalls_destroy_event(chan
);
352 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
353 &session
->enablers_head
, node
)
354 lttng_event_enabler_destroy(event_enabler
);
355 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
356 _lttng_event_destroy(event
);
357 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
358 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
359 _lttng_channel_destroy(chan
);
361 mutex_lock(&session
->metadata_cache
->lock
);
362 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
363 _lttng_metadata_channel_hangup(metadata_stream
);
364 mutex_unlock(&session
->metadata_cache
->lock
);
365 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
366 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
367 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
368 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
369 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
370 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
371 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
372 list_del(&session
->list
);
373 mutex_unlock(&sessions_mutex
);
374 lttng_kvfree(session
);
377 void lttng_event_notifier_group_destroy(
378 struct lttng_event_notifier_group
*event_notifier_group
)
380 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
381 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
384 if (!event_notifier_group
)
387 mutex_lock(&sessions_mutex
);
389 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
392 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
393 &event_notifier_group
->event_notifiers_head
, list
) {
394 ret
= _lttng_event_notifier_unregister(event_notifier
);
398 /* Wait for in-flight event notifier to complete */
401 irq_work_sync(&event_notifier_group
->wakeup_pending
);
403 kfree(event_notifier_group
->sc_filter
);
405 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
406 &event_notifier_group
->enablers_head
, node
)
407 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
409 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
410 &event_notifier_group
->event_notifiers_head
, list
)
411 _lttng_event_notifier_destroy(event_notifier
);
413 if (event_notifier_group
->error_counter
) {
414 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
416 error_counter
->ops
->counter_destroy(error_counter
->counter
);
417 module_put(error_counter
->transport
->owner
);
418 lttng_kvfree(error_counter
);
419 event_notifier_group
->error_counter
= NULL
;
422 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
423 module_put(event_notifier_group
->transport
->owner
);
424 list_del(&event_notifier_group
->node
);
426 mutex_unlock(&sessions_mutex
);
427 lttng_kvfree(event_notifier_group
);
430 int lttng_session_statedump(struct lttng_session
*session
)
434 mutex_lock(&sessions_mutex
);
435 ret
= lttng_statedump_start(session
);
436 mutex_unlock(&sessions_mutex
);
440 int lttng_session_enable(struct lttng_session
*session
)
443 struct lttng_channel
*chan
;
445 mutex_lock(&sessions_mutex
);
446 if (session
->active
) {
451 /* Set transient enabler state to "enabled" */
454 /* We need to sync enablers with session before activation. */
455 lttng_session_sync_event_enablers(session
);
458 * Snapshot the number of events per channel to know the type of header
461 list_for_each_entry(chan
, &session
->chan
, list
) {
462 if (chan
->header_type
)
463 continue; /* don't change it if session stop/restart */
464 if (chan
->free_event_id
< 31)
465 chan
->header_type
= 1; /* compact */
467 chan
->header_type
= 2; /* large */
470 /* Clear each stream's quiescent state. */
471 list_for_each_entry(chan
, &session
->chan
, list
) {
472 if (chan
->channel_type
!= METADATA_CHANNEL
)
473 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
476 WRITE_ONCE(session
->active
, 1);
477 WRITE_ONCE(session
->been_active
, 1);
478 ret
= _lttng_session_metadata_statedump(session
);
480 WRITE_ONCE(session
->active
, 0);
483 ret
= lttng_statedump_start(session
);
485 WRITE_ONCE(session
->active
, 0);
487 mutex_unlock(&sessions_mutex
);
491 int lttng_session_disable(struct lttng_session
*session
)
494 struct lttng_channel
*chan
;
496 mutex_lock(&sessions_mutex
);
497 if (!session
->active
) {
501 WRITE_ONCE(session
->active
, 0);
503 /* Set transient enabler state to "disabled" */
505 lttng_session_sync_event_enablers(session
);
507 /* Set each stream's quiescent state. */
508 list_for_each_entry(chan
, &session
->chan
, list
) {
509 if (chan
->channel_type
!= METADATA_CHANNEL
)
510 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
513 mutex_unlock(&sessions_mutex
);
517 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
520 struct lttng_channel
*chan
;
521 struct lttng_event
*event
;
522 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
523 struct lttng_metadata_stream
*stream
;
525 mutex_lock(&sessions_mutex
);
526 if (!session
->active
) {
531 mutex_lock(&cache
->lock
);
532 memset(cache
->data
, 0, cache
->cache_alloc
);
533 cache
->metadata_written
= 0;
535 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
536 stream
->metadata_out
= 0;
537 stream
->metadata_in
= 0;
539 mutex_unlock(&cache
->lock
);
541 session
->metadata_dumped
= 0;
542 list_for_each_entry(chan
, &session
->chan
, list
) {
543 chan
->metadata_dumped
= 0;
546 list_for_each_entry(event
, &session
->events
, list
) {
547 event
->metadata_dumped
= 0;
550 ret
= _lttng_session_metadata_statedump(session
);
553 mutex_unlock(&sessions_mutex
);
557 int lttng_channel_enable(struct lttng_channel
*channel
)
561 mutex_lock(&sessions_mutex
);
562 if (channel
->channel_type
== METADATA_CHANNEL
) {
566 if (channel
->enabled
) {
570 /* Set transient enabler state to "enabled" */
572 lttng_session_sync_event_enablers(channel
->session
);
573 /* Set atomically the state to "enabled" */
574 WRITE_ONCE(channel
->enabled
, 1);
576 mutex_unlock(&sessions_mutex
);
580 int lttng_channel_disable(struct lttng_channel
*channel
)
584 mutex_lock(&sessions_mutex
);
585 if (channel
->channel_type
== METADATA_CHANNEL
) {
589 if (!channel
->enabled
) {
593 /* Set atomically the state to "disabled" */
594 WRITE_ONCE(channel
->enabled
, 0);
595 /* Set transient enabler state to "enabled" */
597 lttng_session_sync_event_enablers(channel
->session
);
599 mutex_unlock(&sessions_mutex
);
603 int lttng_event_enable(struct lttng_event
*event
)
607 mutex_lock(&sessions_mutex
);
608 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
612 if (event
->enabled
) {
616 switch (event
->instrumentation
) {
617 case LTTNG_KERNEL_TRACEPOINT
:
618 case LTTNG_KERNEL_SYSCALL
:
621 case LTTNG_KERNEL_KPROBE
:
622 case LTTNG_KERNEL_UPROBE
:
623 case LTTNG_KERNEL_NOOP
:
624 WRITE_ONCE(event
->enabled
, 1);
626 case LTTNG_KERNEL_KRETPROBE
:
627 ret
= lttng_kretprobes_event_enable_state(event
, 1);
629 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
635 mutex_unlock(&sessions_mutex
);
639 int lttng_event_disable(struct lttng_event
*event
)
643 mutex_lock(&sessions_mutex
);
644 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
648 if (!event
->enabled
) {
652 switch (event
->instrumentation
) {
653 case LTTNG_KERNEL_TRACEPOINT
:
654 case LTTNG_KERNEL_SYSCALL
:
657 case LTTNG_KERNEL_KPROBE
:
658 case LTTNG_KERNEL_UPROBE
:
659 case LTTNG_KERNEL_NOOP
:
660 WRITE_ONCE(event
->enabled
, 0);
662 case LTTNG_KERNEL_KRETPROBE
:
663 ret
= lttng_kretprobes_event_enable_state(event
, 0);
665 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
671 mutex_unlock(&sessions_mutex
);
675 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
679 mutex_lock(&sessions_mutex
);
680 if (event_notifier
->enabled
) {
684 switch (event_notifier
->instrumentation
) {
685 case LTTNG_KERNEL_TRACEPOINT
:
686 case LTTNG_KERNEL_SYSCALL
:
689 case LTTNG_KERNEL_KPROBE
:
690 case LTTNG_KERNEL_UPROBE
:
691 WRITE_ONCE(event_notifier
->enabled
, 1);
693 case LTTNG_KERNEL_FUNCTION
:
694 case LTTNG_KERNEL_NOOP
:
695 case LTTNG_KERNEL_KRETPROBE
:
701 mutex_unlock(&sessions_mutex
);
705 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
709 mutex_lock(&sessions_mutex
);
710 if (!event_notifier
->enabled
) {
714 switch (event_notifier
->instrumentation
) {
715 case LTTNG_KERNEL_TRACEPOINT
:
716 case LTTNG_KERNEL_SYSCALL
:
719 case LTTNG_KERNEL_KPROBE
:
720 case LTTNG_KERNEL_UPROBE
:
721 WRITE_ONCE(event_notifier
->enabled
, 0);
723 case LTTNG_KERNEL_FUNCTION
:
724 case LTTNG_KERNEL_NOOP
:
725 case LTTNG_KERNEL_KRETPROBE
:
731 mutex_unlock(&sessions_mutex
);
735 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
736 const char *transport_name
,
738 size_t subbuf_size
, size_t num_subbuf
,
739 unsigned int switch_timer_interval
,
740 unsigned int read_timer_interval
,
741 enum channel_type channel_type
)
743 struct lttng_channel
*chan
;
744 struct lttng_transport
*transport
= NULL
;
746 mutex_lock(&sessions_mutex
);
747 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
748 goto active
; /* Refuse to add channel to active session */
749 transport
= lttng_transport_find(transport_name
);
751 printk(KERN_WARNING
"LTTng: transport %s not found\n",
755 if (!try_module_get(transport
->owner
)) {
756 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
759 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
762 chan
->session
= session
;
763 chan
->id
= session
->free_chan_id
++;
764 chan
->ops
= &transport
->ops
;
766 * Note: the channel creation op already writes into the packet
767 * headers. Therefore the "chan" information used as input
768 * should be already accessible.
770 chan
->chan
= transport
->ops
.channel_create(transport_name
,
771 chan
, buf_addr
, subbuf_size
, num_subbuf
,
772 switch_timer_interval
, read_timer_interval
);
777 chan
->transport
= transport
;
778 chan
->channel_type
= channel_type
;
779 list_add(&chan
->list
, &session
->chan
);
780 mutex_unlock(&sessions_mutex
);
787 module_put(transport
->owner
);
790 mutex_unlock(&sessions_mutex
);
795 * Only used internally at session destruction for per-cpu channels, and
796 * when metadata channel is released.
797 * Needs to be called with sessions mutex held.
800 void _lttng_channel_destroy(struct lttng_channel
*chan
)
802 chan
->ops
->channel_destroy(chan
->chan
);
803 module_put(chan
->transport
->owner
);
804 list_del(&chan
->list
);
805 lttng_destroy_context(chan
->ctx
);
809 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
811 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
813 /* Protect the metadata cache with the sessions_mutex. */
814 mutex_lock(&sessions_mutex
);
815 _lttng_channel_destroy(chan
);
816 mutex_unlock(&sessions_mutex
);
818 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
821 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
823 stream
->finalized
= 1;
824 wake_up_interruptible(&stream
->read_wait
);
829 * Supports event creation while tracing session is active.
830 * Needs to be called with sessions mutex held.
832 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
833 struct lttng_kernel_event
*event_param
,
835 const struct lttng_event_desc
*event_desc
,
836 enum lttng_kernel_instrumentation itype
)
838 struct lttng_session
*session
= chan
->session
;
839 struct lttng_event
*event
;
840 const char *event_name
;
841 struct hlist_head
*head
;
844 if (chan
->free_event_id
== -1U) {
850 case LTTNG_KERNEL_TRACEPOINT
:
851 event_name
= event_desc
->name
;
853 case LTTNG_KERNEL_KPROBE
:
854 case LTTNG_KERNEL_UPROBE
:
855 case LTTNG_KERNEL_KRETPROBE
:
856 case LTTNG_KERNEL_NOOP
:
857 case LTTNG_KERNEL_SYSCALL
:
858 event_name
= event_param
->name
;
860 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
867 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
868 LTTNG_EVENT_HT_SIZE
, event_name
);
869 lttng_hlist_for_each_entry(event
, head
, hlist
) {
870 WARN_ON_ONCE(!event
->desc
);
871 if (!strncmp(event
->desc
->name
, event_name
,
872 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
873 && chan
== event
->chan
) {
879 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
885 event
->filter
= filter
;
886 event
->id
= chan
->free_event_id
++;
887 event
->instrumentation
= itype
;
888 event
->evtype
= LTTNG_TYPE_EVENT
;
889 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
890 INIT_LIST_HEAD(&event
->enablers_ref_head
);
893 case LTTNG_KERNEL_TRACEPOINT
:
894 /* Event will be enabled by enabler sync. */
896 event
->registered
= 0;
897 event
->desc
= lttng_event_desc_get(event_name
);
902 /* Populate lttng_event structure before event registration. */
905 case LTTNG_KERNEL_KPROBE
:
907 * Needs to be explicitly enabled after creation, since
908 * we may want to apply filters.
911 event
->registered
= 1;
913 * Populate lttng_event structure before event
917 ret
= lttng_kprobes_register_event(event_name
,
918 event_param
->u
.kprobe
.symbol_name
,
919 event_param
->u
.kprobe
.offset
,
920 event_param
->u
.kprobe
.addr
,
926 ret
= try_module_get(event
->desc
->owner
);
929 case LTTNG_KERNEL_KRETPROBE
:
931 struct lttng_event
*event_return
;
933 /* kretprobe defines 2 events */
935 * Needs to be explicitly enabled after creation, since
936 * we may want to apply filters.
939 event
->registered
= 1;
941 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
946 event_return
->chan
= chan
;
947 event_return
->filter
= filter
;
948 event_return
->id
= chan
->free_event_id
++;
949 event_return
->enabled
= 0;
950 event_return
->registered
= 1;
951 event_return
->instrumentation
= itype
;
952 INIT_LIST_HEAD(&event_return
->filter_bytecode_runtime_head
);
953 INIT_LIST_HEAD(&event_return
->enablers_ref_head
);
955 * Populate lttng_event structure before kretprobe registration.
958 ret
= lttng_kretprobes_register(event_name
,
959 event_param
->u
.kretprobe
.symbol_name
,
960 event_param
->u
.kretprobe
.offset
,
961 event_param
->u
.kretprobe
.addr
,
962 event
, event_return
);
964 kmem_cache_free(event_cache
, event_return
);
968 /* Take 2 refs on the module: one per event. */
969 ret
= try_module_get(event
->desc
->owner
);
971 ret
= try_module_get(event
->desc
->owner
);
973 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
975 WARN_ON_ONCE(ret
> 0);
977 kmem_cache_free(event_cache
, event_return
);
978 module_put(event
->desc
->owner
);
979 module_put(event
->desc
->owner
);
980 goto statedump_error
;
982 list_add(&event_return
->list
, &chan
->session
->events
);
985 case LTTNG_KERNEL_NOOP
:
986 case LTTNG_KERNEL_SYSCALL
:
988 * Needs to be explicitly enabled after creation, since
989 * we may want to apply filters.
992 event
->registered
= 0;
993 event
->desc
= event_desc
;
994 switch (event_param
->u
.syscall
.entryexit
) {
995 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
998 case LTTNG_KERNEL_SYSCALL_ENTRY
:
999 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1001 case LTTNG_KERNEL_SYSCALL_EXIT
:
1002 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1005 switch (event_param
->u
.syscall
.abi
) {
1006 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1008 goto register_error
;
1009 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1010 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1012 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1013 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1018 goto register_error
;
1021 case LTTNG_KERNEL_UPROBE
:
1023 * Needs to be explicitly enabled after creation, since
1024 * we may want to apply filters.
1027 event
->registered
= 1;
1030 * Populate lttng_event structure before event
1035 ret
= lttng_uprobes_register_event(event_param
->name
,
1036 event_param
->u
.uprobe
.fd
,
1039 goto register_error
;
1040 ret
= try_module_get(event
->desc
->owner
);
1043 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1047 goto register_error
;
1049 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
1050 WARN_ON_ONCE(ret
> 0);
1052 goto statedump_error
;
1054 hlist_add_head(&event
->hlist
, head
);
1055 list_add(&event
->list
, &chan
->session
->events
);
1059 /* If a statedump error occurs, events will not be readable. */
1061 kmem_cache_free(event_cache
, event
);
1066 return ERR_PTR(ret
);
1069 struct lttng_event_notifier
*_lttng_event_notifier_create(
1070 const struct lttng_event_desc
*event_desc
,
1071 uint64_t token
, uint64_t error_counter_index
,
1072 struct lttng_event_notifier_group
*event_notifier_group
,
1073 struct lttng_kernel_event_notifier
*event_notifier_param
,
1074 void *filter
, enum lttng_kernel_instrumentation itype
)
1076 struct lttng_event_notifier
*event_notifier
;
1077 struct lttng_counter
*error_counter
;
1078 const char *event_name
;
1079 struct hlist_head
*head
;
1083 case LTTNG_KERNEL_TRACEPOINT
:
1084 event_name
= event_desc
->name
;
1086 case LTTNG_KERNEL_KPROBE
:
1087 case LTTNG_KERNEL_UPROBE
:
1088 case LTTNG_KERNEL_SYSCALL
:
1089 event_name
= event_notifier_param
->event
.name
;
1091 case LTTNG_KERNEL_KRETPROBE
:
1092 case LTTNG_KERNEL_FUNCTION
:
1093 case LTTNG_KERNEL_NOOP
:
1100 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1101 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1102 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1103 WARN_ON_ONCE(!event_notifier
->desc
);
1104 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1105 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1106 && event_notifier_group
== event_notifier
->group
1107 && token
== event_notifier
->user_token
) {
1113 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1114 if (!event_notifier
) {
1119 event_notifier
->group
= event_notifier_group
;
1120 event_notifier
->user_token
= token
;
1121 event_notifier
->error_counter_index
= error_counter_index
;
1122 event_notifier
->num_captures
= 0;
1123 event_notifier
->filter
= filter
;
1124 event_notifier
->instrumentation
= itype
;
1125 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1126 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1127 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1128 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1129 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1132 case LTTNG_KERNEL_TRACEPOINT
:
1133 /* Event will be enabled by enabler sync. */
1134 event_notifier
->enabled
= 0;
1135 event_notifier
->registered
= 0;
1136 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1137 if (!event_notifier
->desc
) {
1139 goto register_error
;
1141 /* Populate lttng_event_notifier structure before event registration. */
1144 case LTTNG_KERNEL_KPROBE
:
1146 * Needs to be explicitly enabled after creation, since
1147 * we may want to apply filters.
1149 event_notifier
->enabled
= 0;
1150 event_notifier
->registered
= 1;
1152 * Populate lttng_event_notifier structure before event
1156 ret
= lttng_kprobes_register_event_notifier(
1157 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1158 event_notifier_param
->event
.u
.kprobe
.offset
,
1159 event_notifier_param
->event
.u
.kprobe
.addr
,
1163 goto register_error
;
1165 ret
= try_module_get(event_notifier
->desc
->owner
);
1168 case LTTNG_KERNEL_NOOP
:
1169 case LTTNG_KERNEL_SYSCALL
:
1171 * Needs to be explicitly enabled after creation, since
1172 * we may want to apply filters.
1174 event_notifier
->enabled
= 0;
1175 event_notifier
->registered
= 0;
1176 event_notifier
->desc
= event_desc
;
1177 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1178 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1180 goto register_error
;
1181 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1182 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1184 case LTTNG_KERNEL_SYSCALL_EXIT
:
1185 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1188 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1189 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1191 goto register_error
;
1192 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1193 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1195 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1196 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1200 if (!event_notifier
->desc
) {
1202 goto register_error
;
1205 case LTTNG_KERNEL_UPROBE
:
1207 * Needs to be explicitly enabled after creation, since
1208 * we may want to apply filters.
1210 event_notifier
->enabled
= 0;
1211 event_notifier
->registered
= 1;
1214 * Populate lttng_event_notifier structure before
1215 * event_notifier registration.
1219 ret
= lttng_uprobes_register_event_notifier(
1220 event_notifier_param
->event
.name
,
1221 event_notifier_param
->event
.u
.uprobe
.fd
,
1224 goto register_error
;
1225 ret
= try_module_get(event_notifier
->desc
->owner
);
1228 case LTTNG_KERNEL_KRETPROBE
:
1229 case LTTNG_KERNEL_FUNCTION
:
1233 goto register_error
;
1236 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1237 hlist_add_head(&event_notifier
->hlist
, head
);
1240 * Clear the error counter bucket. The sessiond keeps track of which
1241 * bucket is currently in use. We trust it. The session lock
1242 * synchronizes against concurrent creation of the error
1245 error_counter
= event_notifier_group
->error_counter
;
1246 if (error_counter
) {
1247 size_t dimension_index
[1];
1250 * Check that the index is within the boundary of the counter.
1252 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1253 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1254 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1256 goto register_error
;
1259 dimension_index
[0] = event_notifier
->error_counter_index
;
1260 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1262 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1263 event_notifier
->error_counter_index
);
1264 goto register_error
;
1268 return event_notifier
;
1271 kmem_cache_free(event_notifier_cache
, event_notifier
);
1275 return ERR_PTR(ret
);
1278 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1279 const size_t *dim_indexes
, int32_t cpu
,
1280 int64_t *val
, bool *overflow
, bool *underflow
)
1282 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1283 cpu
, val
, overflow
, underflow
);
1286 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1287 const size_t *dim_indexes
, int64_t *val
,
1288 bool *overflow
, bool *underflow
)
1290 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1291 val
, overflow
, underflow
);
1294 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1295 const size_t *dim_indexes
)
1297 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1300 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1301 struct lttng_kernel_event
*event_param
,
1303 const struct lttng_event_desc
*event_desc
,
1304 enum lttng_kernel_instrumentation itype
)
1306 struct lttng_event
*event
;
1308 mutex_lock(&sessions_mutex
);
1309 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1311 mutex_unlock(&sessions_mutex
);
1315 struct lttng_event_notifier
*lttng_event_notifier_create(
1316 const struct lttng_event_desc
*event_desc
,
1317 uint64_t id
, uint64_t error_counter_index
,
1318 struct lttng_event_notifier_group
*event_notifier_group
,
1319 struct lttng_kernel_event_notifier
*event_notifier_param
,
1320 void *filter
, enum lttng_kernel_instrumentation itype
)
1322 struct lttng_event_notifier
*event_notifier
;
1324 mutex_lock(&sessions_mutex
);
1325 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1326 error_counter_index
, event_notifier_group
,
1327 event_notifier_param
, filter
, itype
);
1328 mutex_unlock(&sessions_mutex
);
1329 return event_notifier
;
1332 /* Only used for tracepoints for now. */
1334 void register_event(struct lttng_event
*event
)
1336 const struct lttng_event_desc
*desc
;
1339 if (event
->registered
)
1343 switch (event
->instrumentation
) {
1344 case LTTNG_KERNEL_TRACEPOINT
:
1345 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1346 desc
->probe_callback
,
1349 case LTTNG_KERNEL_SYSCALL
:
1350 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1352 case LTTNG_KERNEL_KPROBE
:
1353 case LTTNG_KERNEL_UPROBE
:
1354 case LTTNG_KERNEL_KRETPROBE
:
1355 case LTTNG_KERNEL_NOOP
:
1358 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1363 event
->registered
= 1;
1367 * Only used internally at session destruction.
1369 int _lttng_event_unregister(struct lttng_event
*event
)
1371 const struct lttng_event_desc
*desc
;
1374 if (!event
->registered
)
1378 switch (event
->instrumentation
) {
1379 case LTTNG_KERNEL_TRACEPOINT
:
1380 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1381 event
->desc
->probe_callback
,
1384 case LTTNG_KERNEL_KPROBE
:
1385 lttng_kprobes_unregister_event(event
);
1388 case LTTNG_KERNEL_KRETPROBE
:
1389 lttng_kretprobes_unregister(event
);
1392 case LTTNG_KERNEL_SYSCALL
:
1393 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1395 case LTTNG_KERNEL_NOOP
:
1398 case LTTNG_KERNEL_UPROBE
:
1399 lttng_uprobes_unregister_event(event
);
1402 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1407 event
->registered
= 0;
1411 /* Only used for tracepoints for now. */
1413 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1415 const struct lttng_event_desc
*desc
;
1418 if (event_notifier
->registered
)
1421 desc
= event_notifier
->desc
;
1422 switch (event_notifier
->instrumentation
) {
1423 case LTTNG_KERNEL_TRACEPOINT
:
1424 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1425 desc
->event_notifier_callback
,
1428 case LTTNG_KERNEL_SYSCALL
:
1429 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1431 case LTTNG_KERNEL_KPROBE
:
1432 case LTTNG_KERNEL_UPROBE
:
1435 case LTTNG_KERNEL_KRETPROBE
:
1436 case LTTNG_KERNEL_FUNCTION
:
1437 case LTTNG_KERNEL_NOOP
:
1442 event_notifier
->registered
= 1;
1446 int _lttng_event_notifier_unregister(
1447 struct lttng_event_notifier
*event_notifier
)
1449 const struct lttng_event_desc
*desc
;
1452 if (!event_notifier
->registered
)
1455 desc
= event_notifier
->desc
;
1456 switch (event_notifier
->instrumentation
) {
1457 case LTTNG_KERNEL_TRACEPOINT
:
1458 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1459 event_notifier
->desc
->event_notifier_callback
,
1462 case LTTNG_KERNEL_KPROBE
:
1463 lttng_kprobes_unregister_event_notifier(event_notifier
);
1466 case LTTNG_KERNEL_UPROBE
:
1467 lttng_uprobes_unregister_event_notifier(event_notifier
);
1470 case LTTNG_KERNEL_SYSCALL
:
1471 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1473 case LTTNG_KERNEL_KRETPROBE
:
1474 case LTTNG_KERNEL_FUNCTION
:
1475 case LTTNG_KERNEL_NOOP
:
1480 event_notifier
->registered
= 0;
1485 * Only used internally at session destruction.
1488 void _lttng_event_destroy(struct lttng_event
*event
)
1490 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1492 switch (event
->instrumentation
) {
1493 case LTTNG_KERNEL_TRACEPOINT
:
1494 lttng_event_desc_put(event
->desc
);
1496 case LTTNG_KERNEL_KPROBE
:
1497 module_put(event
->desc
->owner
);
1498 lttng_kprobes_destroy_event_private(event
);
1500 case LTTNG_KERNEL_KRETPROBE
:
1501 module_put(event
->desc
->owner
);
1502 lttng_kretprobes_destroy_private(event
);
1504 case LTTNG_KERNEL_NOOP
:
1505 case LTTNG_KERNEL_SYSCALL
:
1507 case LTTNG_KERNEL_UPROBE
:
1508 module_put(event
->desc
->owner
);
1509 lttng_uprobes_destroy_event_private(event
);
1511 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1515 list_del(&event
->list
);
1516 lttng_destroy_context(event
->ctx
);
1517 lttng_free_event_filter_runtime(event
);
1518 /* Free event enabler refs */
1519 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1520 &event
->enablers_ref_head
, node
)
1522 kmem_cache_free(event_cache
, event
);
1526 * Only used internally at session destruction.
1529 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1531 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1533 switch (event_notifier
->instrumentation
) {
1534 case LTTNG_KERNEL_TRACEPOINT
:
1535 lttng_event_desc_put(event_notifier
->desc
);
1537 case LTTNG_KERNEL_KPROBE
:
1538 module_put(event_notifier
->desc
->owner
);
1539 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1541 case LTTNG_KERNEL_NOOP
:
1542 case LTTNG_KERNEL_SYSCALL
:
1544 case LTTNG_KERNEL_UPROBE
:
1545 module_put(event_notifier
->desc
->owner
);
1546 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1548 case LTTNG_KERNEL_KRETPROBE
:
1549 case LTTNG_KERNEL_FUNCTION
:
1553 list_del(&event_notifier
->list
);
1554 lttng_free_event_notifier_filter_runtime(event_notifier
);
1555 /* Free event enabler refs */
1556 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1557 &event_notifier
->enablers_ref_head
, node
)
1559 kmem_cache_free(event_notifier_cache
, event_notifier
);
1562 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1563 enum tracker_type tracker_type
)
1565 switch (tracker_type
) {
1567 return &session
->pid_tracker
;
1569 return &session
->vpid_tracker
;
1571 return &session
->uid_tracker
;
1573 return &session
->vuid_tracker
;
1575 return &session
->gid_tracker
;
1577 return &session
->vgid_tracker
;
1584 int lttng_session_track_id(struct lttng_session
*session
,
1585 enum tracker_type tracker_type
, int id
)
1587 struct lttng_id_tracker
*tracker
;
1590 tracker
= get_tracker(session
, tracker_type
);
1595 mutex_lock(&sessions_mutex
);
1597 /* track all ids: destroy tracker. */
1598 lttng_id_tracker_destroy(tracker
, true);
1601 ret
= lttng_id_tracker_add(tracker
, id
);
1603 mutex_unlock(&sessions_mutex
);
1607 int lttng_session_untrack_id(struct lttng_session
*session
,
1608 enum tracker_type tracker_type
, int id
)
1610 struct lttng_id_tracker
*tracker
;
1613 tracker
= get_tracker(session
, tracker_type
);
1618 mutex_lock(&sessions_mutex
);
1620 /* untrack all ids: replace by empty tracker. */
1621 ret
= lttng_id_tracker_empty_set(tracker
);
1623 ret
= lttng_id_tracker_del(tracker
, id
);
1625 mutex_unlock(&sessions_mutex
);
1630 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1632 struct lttng_id_tracker
*id_tracker
= m
->private;
1633 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1634 struct lttng_id_hash_node
*e
;
1637 mutex_lock(&sessions_mutex
);
1639 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1640 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1642 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1648 /* ID tracker disabled. */
1649 if (iter
>= *pos
&& iter
== 0) {
1650 return id_tracker_p
; /* empty tracker */
1658 /* Called with sessions_mutex held. */
1660 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1662 struct lttng_id_tracker
*id_tracker
= m
->private;
1663 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1664 struct lttng_id_hash_node
*e
;
1669 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1670 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1672 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1673 if (iter
++ >= *ppos
)
1678 /* ID tracker disabled. */
1679 if (iter
>= *ppos
&& iter
== 0)
1680 return p
; /* empty tracker */
1689 void id_list_stop(struct seq_file
*m
, void *p
)
1691 mutex_unlock(&sessions_mutex
);
1695 int id_list_show(struct seq_file
*m
, void *p
)
1697 struct lttng_id_tracker
*id_tracker
= m
->private;
1698 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1701 if (p
== id_tracker_p
) {
1702 /* Tracker disabled. */
1705 const struct lttng_id_hash_node
*e
= p
;
1707 id
= lttng_id_tracker_get_node_id(e
);
1709 switch (id_tracker
->tracker_type
) {
1711 seq_printf(m
, "process { pid = %d; };\n", id
);
1714 seq_printf(m
, "process { vpid = %d; };\n", id
);
1717 seq_printf(m
, "user { uid = %d; };\n", id
);
1720 seq_printf(m
, "user { vuid = %d; };\n", id
);
1723 seq_printf(m
, "group { gid = %d; };\n", id
);
1726 seq_printf(m
, "group { vgid = %d; };\n", id
);
1729 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1735 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1736 .start
= id_list_start
,
1737 .next
= id_list_next
,
1738 .stop
= id_list_stop
,
1739 .show
= id_list_show
,
1743 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1745 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1749 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1751 struct seq_file
*m
= file
->private_data
;
1752 struct lttng_id_tracker
*id_tracker
= m
->private;
1755 WARN_ON_ONCE(!id_tracker
);
1756 ret
= seq_release(inode
, file
);
1758 fput(id_tracker
->session
->file
);
1762 const struct file_operations lttng_tracker_ids_list_fops
= {
1763 .owner
= THIS_MODULE
,
1764 .open
= lttng_tracker_ids_list_open
,
1766 .llseek
= seq_lseek
,
1767 .release
= lttng_tracker_ids_list_release
,
1770 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1771 enum tracker_type tracker_type
)
1773 struct file
*tracker_ids_list_file
;
1777 file_fd
= lttng_get_unused_fd();
1783 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1784 <tng_tracker_ids_list_fops
,
1786 if (IS_ERR(tracker_ids_list_file
)) {
1787 ret
= PTR_ERR(tracker_ids_list_file
);
1790 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1792 goto refcount_error
;
1794 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1797 m
= tracker_ids_list_file
->private_data
;
1799 m
->private = get_tracker(session
, tracker_type
);
1800 BUG_ON(!m
->private);
1801 fd_install(file_fd
, tracker_ids_list_file
);
1806 atomic_long_dec(&session
->file
->f_count
);
1808 fput(tracker_ids_list_file
);
1810 put_unused_fd(file_fd
);
1816 * Enabler management.
1819 int lttng_match_enabler_star_glob(const char *desc_name
,
1820 const char *pattern
)
1822 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1823 desc_name
, LTTNG_SIZE_MAX
))
1829 int lttng_match_enabler_name(const char *desc_name
,
1832 if (strcmp(desc_name
, name
))
1837 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1838 struct lttng_enabler
*enabler
)
1840 const char *desc_name
, *enabler_name
;
1841 bool compat
= false, entry
= false;
1843 enabler_name
= enabler
->event_param
.name
;
1844 switch (enabler
->event_param
.instrumentation
) {
1845 case LTTNG_KERNEL_TRACEPOINT
:
1846 desc_name
= desc
->name
;
1847 switch (enabler
->format_type
) {
1848 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1849 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1850 case LTTNG_ENABLER_FORMAT_NAME
:
1851 return lttng_match_enabler_name(desc_name
, enabler_name
);
1856 case LTTNG_KERNEL_SYSCALL
:
1857 desc_name
= desc
->name
;
1858 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1859 desc_name
+= strlen("compat_");
1862 if (!strncmp(desc_name
, "syscall_exit_",
1863 strlen("syscall_exit_"))) {
1864 desc_name
+= strlen("syscall_exit_");
1865 } else if (!strncmp(desc_name
, "syscall_entry_",
1866 strlen("syscall_entry_"))) {
1867 desc_name
+= strlen("syscall_entry_");
1873 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1874 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1876 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1880 case LTTNG_KERNEL_SYSCALL_EXIT
:
1887 switch (enabler
->event_param
.u
.syscall
.abi
) {
1888 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1890 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1894 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1901 switch (enabler
->event_param
.u
.syscall
.match
) {
1902 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
1903 switch (enabler
->format_type
) {
1904 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1905 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1906 case LTTNG_ENABLER_FORMAT_NAME
:
1907 return lttng_match_enabler_name(desc_name
, enabler_name
);
1912 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
1913 return -EINVAL
; /* Not implemented. */
1925 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1926 struct lttng_event
*event
)
1928 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1931 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1933 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1934 && event
->chan
== event_enabler
->chan
)
1941 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1942 struct lttng_event_notifier
*event_notifier
)
1944 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1945 event_notifier_enabler
);
1947 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
1949 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
1950 && event_notifier
->group
== event_notifier_enabler
->group
1951 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1958 struct lttng_enabler_ref
*lttng_enabler_ref(
1959 struct list_head
*enablers_ref_list
,
1960 struct lttng_enabler
*enabler
)
1962 struct lttng_enabler_ref
*enabler_ref
;
1964 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
1965 if (enabler_ref
->ref
== enabler
)
1972 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1974 struct lttng_session
*session
= event_enabler
->chan
->session
;
1975 struct lttng_probe_desc
*probe_desc
;
1976 const struct lttng_event_desc
*desc
;
1978 struct list_head
*probe_list
;
1980 probe_list
= lttng_get_probe_list_head();
1982 * For each probe event, if we find that a probe event matches
1983 * our enabler, create an associated lttng_event if not
1986 list_for_each_entry(probe_desc
, probe_list
, head
) {
1987 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1989 struct hlist_head
*head
;
1990 struct lttng_event
*event
;
1992 desc
= probe_desc
->event_desc
[i
];
1993 if (!lttng_desc_match_enabler(desc
,
1994 lttng_event_enabler_as_enabler(event_enabler
)))
1998 * Check if already created.
2000 head
= utils_borrow_hash_table_bucket(
2001 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2003 lttng_hlist_for_each_entry(event
, head
, hlist
) {
2004 if (event
->desc
== desc
2005 && event
->chan
== event_enabler
->chan
)
2012 * We need to create an event for this
2015 event
= _lttng_event_create(event_enabler
->chan
,
2017 LTTNG_KERNEL_TRACEPOINT
);
2019 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2020 probe_desc
->event_desc
[i
]->name
);
2027 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2029 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2030 struct lttng_probe_desc
*probe_desc
;
2031 const struct lttng_event_desc
*desc
;
2033 struct list_head
*probe_list
;
2035 probe_list
= lttng_get_probe_list_head();
2037 * For each probe event, if we find that a probe event matches
2038 * our enabler, create an associated lttng_event_notifier if not
2041 list_for_each_entry(probe_desc
, probe_list
, head
) {
2042 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2044 struct hlist_head
*head
;
2045 struct lttng_event_notifier
*event_notifier
;
2047 desc
= probe_desc
->event_desc
[i
];
2048 if (!lttng_desc_match_enabler(desc
,
2049 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2053 * Check if already created.
2055 head
= utils_borrow_hash_table_bucket(
2056 event_notifier_group
->event_notifiers_ht
.table
,
2057 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
2058 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2059 if (event_notifier
->desc
== desc
2060 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2067 * We need to create a event_notifier for this event probe.
2069 event_notifier
= _lttng_event_notifier_create(desc
,
2070 event_notifier_enabler
->base
.user_token
,
2071 event_notifier_enabler
->error_counter_index
,
2072 event_notifier_group
, NULL
, NULL
,
2073 LTTNG_KERNEL_TRACEPOINT
);
2074 if (IS_ERR(event_notifier
)) {
2075 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2076 probe_desc
->event_desc
[i
]->name
);
2083 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2087 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2092 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2096 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2098 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2103 * Create struct lttng_event if it is missing and present in the list of
2104 * tracepoint probes.
2105 * Should be called with sessions mutex held.
2108 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2110 switch (event_enabler
->base
.event_param
.instrumentation
) {
2111 case LTTNG_KERNEL_TRACEPOINT
:
2112 lttng_create_tracepoint_event_if_missing(event_enabler
);
2114 case LTTNG_KERNEL_SYSCALL
:
2115 lttng_create_syscall_event_if_missing(event_enabler
);
2124 * Create events associated with an event_enabler (if not already present),
2125 * and add backward reference from the event to the enabler.
2126 * Should be called with sessions mutex held.
2129 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2131 struct lttng_channel
*chan
= event_enabler
->chan
;
2132 struct lttng_session
*session
= event_enabler
->chan
->session
;
2133 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2134 struct lttng_event
*event
;
2136 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2137 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2138 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2139 !strcmp(base_enabler
->event_param
.name
, "*")) {
2140 int enabled
= base_enabler
->enabled
;
2141 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2143 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2144 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2146 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2147 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2150 /* First ensure that probe events are created for this enabler. */
2151 lttng_create_event_if_missing(event_enabler
);
2153 /* For each event matching event_enabler in session event list. */
2154 list_for_each_entry(event
, &session
->events
, list
) {
2155 struct lttng_enabler_ref
*enabler_ref
;
2157 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2159 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2160 lttng_event_enabler_as_enabler(event_enabler
));
2163 * If no backward ref, create it.
2164 * Add backward ref from event to event_enabler.
2166 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2169 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2170 list_add(&enabler_ref
->node
,
2171 &event
->enablers_ref_head
);
2175 * Link filter bytecodes if not linked yet.
2177 lttng_enabler_link_bytecode(event
->desc
,
2179 &event
->filter_bytecode_runtime_head
,
2180 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2182 /* TODO: merge event context. */
2188 * Create struct lttng_event_notifier if it is missing and present in the list of
2189 * tracepoint probes.
2190 * Should be called with sessions mutex held.
2193 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2195 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2196 case LTTNG_KERNEL_TRACEPOINT
:
2197 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2199 case LTTNG_KERNEL_SYSCALL
:
2200 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2209 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2212 int lttng_event_notifier_enabler_ref_event_notifiers(
2213 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2215 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2216 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2217 struct lttng_event_notifier
*event_notifier
;
2219 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2220 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2221 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2222 !strcmp(base_enabler
->event_param
.name
, "*")) {
2224 int enabled
= base_enabler
->enabled
;
2225 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2227 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2228 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2230 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2231 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2235 /* First ensure that probe event_notifiers are created for this enabler. */
2236 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2238 /* Link the created event_notifier with its associated enabler. */
2239 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2240 struct lttng_enabler_ref
*enabler_ref
;
2242 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2245 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2246 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2249 * If no backward ref, create it.
2250 * Add backward ref from event_notifier to enabler.
2252 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2256 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2257 event_notifier_enabler
);
2258 list_add(&enabler_ref
->node
,
2259 &event_notifier
->enablers_ref_head
);
2263 * Link filter bytecodes if not linked yet.
2265 lttng_enabler_link_bytecode(event_notifier
->desc
,
2266 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2267 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2269 /* Link capture bytecodes if not linked yet. */
2270 lttng_enabler_link_bytecode(event_notifier
->desc
,
2271 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2272 &event_notifier_enabler
->capture_bytecode_head
);
2274 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2280 * Called at module load: connect the probe on all enablers matching
2282 * Called with sessions lock held.
2284 int lttng_fix_pending_events(void)
2286 struct lttng_session
*session
;
2288 list_for_each_entry(session
, &sessions
, list
)
2289 lttng_session_lazy_sync_event_enablers(session
);
2293 static bool lttng_event_notifier_group_has_active_event_notifiers(
2294 struct lttng_event_notifier_group
*event_notifier_group
)
2296 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2298 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2300 if (event_notifier_enabler
->base
.enabled
)
2306 bool lttng_event_notifier_active(void)
2308 struct lttng_event_notifier_group
*event_notifier_group
;
2310 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2311 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2317 int lttng_fix_pending_event_notifiers(void)
2319 struct lttng_event_notifier_group
*event_notifier_group
;
2321 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2322 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2326 struct lttng_event_enabler
*lttng_event_enabler_create(
2327 enum lttng_enabler_format_type format_type
,
2328 struct lttng_kernel_event
*event_param
,
2329 struct lttng_channel
*chan
)
2331 struct lttng_event_enabler
*event_enabler
;
2333 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2336 event_enabler
->base
.format_type
= format_type
;
2337 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2338 memcpy(&event_enabler
->base
.event_param
, event_param
,
2339 sizeof(event_enabler
->base
.event_param
));
2340 event_enabler
->chan
= chan
;
2342 event_enabler
->base
.enabled
= 0;
2343 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2344 mutex_lock(&sessions_mutex
);
2345 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2346 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2347 mutex_unlock(&sessions_mutex
);
2348 return event_enabler
;
2351 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2353 mutex_lock(&sessions_mutex
);
2354 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2355 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2356 mutex_unlock(&sessions_mutex
);
2360 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2362 mutex_lock(&sessions_mutex
);
2363 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2364 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2365 mutex_unlock(&sessions_mutex
);
2370 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2371 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2373 struct lttng_bytecode_node
*bytecode_node
;
2374 uint32_t bytecode_len
;
2377 ret
= get_user(bytecode_len
, &bytecode
->len
);
2380 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2384 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2385 sizeof(*bytecode
) + bytecode_len
);
2389 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2390 bytecode_node
->enabler
= enabler
;
2391 /* Enforce length based on allocated size */
2392 bytecode_node
->bc
.len
= bytecode_len
;
2393 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2398 lttng_kvfree(bytecode_node
);
2402 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2403 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2406 ret
= lttng_enabler_attach_filter_bytecode(
2407 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2411 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2418 int lttng_event_add_callsite(struct lttng_event
*event
,
2419 struct lttng_kernel_event_callsite __user
*callsite
)
2422 switch (event
->instrumentation
) {
2423 case LTTNG_KERNEL_UPROBE
:
2424 return lttng_uprobes_event_add_callsite(event
, callsite
);
2430 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2431 struct lttng_kernel_context
*context_param
)
2437 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2439 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2441 /* Destroy filter bytecode */
2442 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2443 &enabler
->filter_bytecode_head
, node
) {
2444 lttng_kvfree(filter_node
);
2449 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2451 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2453 /* Destroy contexts */
2454 lttng_destroy_context(event_enabler
->ctx
);
2456 list_del(&event_enabler
->node
);
2457 kfree(event_enabler
);
2460 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2461 struct lttng_event_notifier_group
*event_notifier_group
,
2462 enum lttng_enabler_format_type format_type
,
2463 struct lttng_kernel_event_notifier
*event_notifier_param
)
2465 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2467 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2468 if (!event_notifier_enabler
)
2471 event_notifier_enabler
->base
.format_type
= format_type
;
2472 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2473 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2475 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2476 event_notifier_enabler
->num_captures
= 0;
2478 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2479 sizeof(event_notifier_enabler
->base
.event_param
));
2480 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2482 event_notifier_enabler
->base
.enabled
= 0;
2483 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2484 event_notifier_enabler
->group
= event_notifier_group
;
2486 mutex_lock(&sessions_mutex
);
2487 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2488 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2490 mutex_unlock(&sessions_mutex
);
2492 return event_notifier_enabler
;
2495 int lttng_event_notifier_enabler_enable(
2496 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2498 mutex_lock(&sessions_mutex
);
2499 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2500 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2501 mutex_unlock(&sessions_mutex
);
2505 int lttng_event_notifier_enabler_disable(
2506 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2508 mutex_lock(&sessions_mutex
);
2509 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2510 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2511 mutex_unlock(&sessions_mutex
);
2515 int lttng_event_notifier_enabler_attach_filter_bytecode(
2516 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2517 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2521 ret
= lttng_enabler_attach_filter_bytecode(
2522 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2527 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2534 int lttng_event_notifier_enabler_attach_capture_bytecode(
2535 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2536 struct lttng_kernel_capture_bytecode __user
*bytecode
)
2538 struct lttng_bytecode_node
*bytecode_node
;
2539 struct lttng_enabler
*enabler
=
2540 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2541 uint32_t bytecode_len
;
2544 ret
= get_user(bytecode_len
, &bytecode
->len
);
2548 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2553 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2554 sizeof(*bytecode
) + bytecode_len
);
2558 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2559 bytecode_node
->enabler
= enabler
;
2561 /* Enforce length based on allocated size */
2562 bytecode_node
->bc
.len
= bytecode_len
;
2563 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2565 event_notifier_enabler
->num_captures
++;
2567 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2571 lttng_kvfree(bytecode_node
);
2576 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2577 struct lttng_kernel_event_callsite __user
*callsite
)
2580 switch (event_notifier
->instrumentation
) {
2581 case LTTNG_KERNEL_UPROBE
:
2582 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2589 int lttng_event_notifier_enabler_attach_context(
2590 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2591 struct lttng_kernel_context
*context_param
)
2597 void lttng_event_notifier_enabler_destroy(
2598 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2600 if (!event_notifier_enabler
) {
2604 list_del(&event_notifier_enabler
->node
);
2606 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2607 kfree(event_notifier_enabler
);
2611 * lttng_session_sync_event_enablers should be called just before starting a
2613 * Should be called with sessions mutex held.
2616 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2618 struct lttng_event_enabler
*event_enabler
;
2619 struct lttng_event
*event
;
2621 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2622 lttng_event_enabler_ref_events(event_enabler
);
2624 * For each event, if at least one of its enablers is enabled,
2625 * and its channel and session transient states are enabled, we
2626 * enable the event, else we disable it.
2628 list_for_each_entry(event
, &session
->events
, list
) {
2629 struct lttng_enabler_ref
*enabler_ref
;
2630 struct lttng_bytecode_runtime
*runtime
;
2631 int enabled
= 0, has_enablers_without_bytecode
= 0;
2633 switch (event
->instrumentation
) {
2634 case LTTNG_KERNEL_TRACEPOINT
:
2635 case LTTNG_KERNEL_SYSCALL
:
2637 list_for_each_entry(enabler_ref
,
2638 &event
->enablers_ref_head
, node
) {
2639 if (enabler_ref
->ref
->enabled
) {
2646 /* Not handled with lazy sync. */
2650 * Enabled state is based on union of enablers, with
2651 * intesection of session and channel transient enable
2654 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2656 WRITE_ONCE(event
->enabled
, enabled
);
2658 * Sync tracepoint registration with event enabled
2662 register_event(event
);
2664 _lttng_event_unregister(event
);
2667 /* Check if has enablers without bytecode enabled */
2668 list_for_each_entry(enabler_ref
,
2669 &event
->enablers_ref_head
, node
) {
2670 if (enabler_ref
->ref
->enabled
2671 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2672 has_enablers_without_bytecode
= 1;
2676 event
->has_enablers_without_bytecode
=
2677 has_enablers_without_bytecode
;
2679 /* Enable filters */
2680 list_for_each_entry(runtime
,
2681 &event
->filter_bytecode_runtime_head
, node
)
2682 lttng_bytecode_filter_sync_state(runtime
);
2687 * Apply enablers to session events, adding events to session if need
2688 * be. It is required after each modification applied to an active
2689 * session, and right before session "start".
2690 * "lazy" sync means we only sync if required.
2691 * Should be called with sessions mutex held.
2694 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2696 /* We can skip if session is not active */
2697 if (!session
->active
)
2699 lttng_session_sync_event_enablers(session
);
2703 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2705 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2706 struct lttng_event_notifier
*event_notifier
;
2708 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2709 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2712 * For each event_notifier, if at least one of its enablers is enabled,
2713 * we enable the event_notifier, else we disable it.
2715 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2716 struct lttng_enabler_ref
*enabler_ref
;
2717 struct lttng_bytecode_runtime
*runtime
;
2718 int enabled
= 0, has_enablers_without_bytecode
= 0;
2720 switch (event_notifier
->instrumentation
) {
2721 case LTTNG_KERNEL_TRACEPOINT
:
2722 case LTTNG_KERNEL_SYSCALL
:
2723 /* Enable event_notifiers */
2724 list_for_each_entry(enabler_ref
,
2725 &event_notifier
->enablers_ref_head
, node
) {
2726 if (enabler_ref
->ref
->enabled
) {
2733 /* Not handled with sync. */
2737 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2739 * Sync tracepoint registration with event_notifier enabled
2743 if (!event_notifier
->registered
)
2744 register_event_notifier(event_notifier
);
2746 if (event_notifier
->registered
)
2747 _lttng_event_notifier_unregister(event_notifier
);
2750 /* Check if has enablers without bytecode enabled */
2751 list_for_each_entry(enabler_ref
,
2752 &event_notifier
->enablers_ref_head
, node
) {
2753 if (enabler_ref
->ref
->enabled
2754 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2755 has_enablers_without_bytecode
= 1;
2759 event_notifier
->has_enablers_without_bytecode
=
2760 has_enablers_without_bytecode
;
2762 /* Enable filters */
2763 list_for_each_entry(runtime
,
2764 &event_notifier
->filter_bytecode_runtime_head
, node
)
2765 lttng_bytecode_filter_sync_state(runtime
);
2767 /* Enable captures */
2768 list_for_each_entry(runtime
,
2769 &event_notifier
->capture_bytecode_runtime_head
, node
)
2770 lttng_bytecode_capture_sync_state(runtime
);
2775 * Serialize at most one packet worth of metadata into a metadata
2777 * We grab the metadata cache mutex to get exclusive access to our metadata
2778 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2779 * allows us to do racy operations such as looking for remaining space left in
2780 * packet and write, since mutual exclusion protects us from concurrent writes.
2781 * Mutual exclusion on the metadata cache allow us to read the cache content
2782 * without racing against reallocation of the cache by updates.
2783 * Returns the number of bytes written in the channel, 0 if no data
2784 * was written and a negative value on error.
2786 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2787 struct channel
*chan
, bool *coherent
)
2789 struct lib_ring_buffer_ctx ctx
;
2791 size_t len
, reserve_len
;
2794 * Ensure we support mutiple get_next / put sequences followed by
2795 * put_next. The metadata cache lock protects reading the metadata
2796 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2797 * "flush" operations on the buffer invoked by different processes.
2798 * Moreover, since the metadata cache memory can be reallocated, we
2799 * need to have exclusive access against updates even though we only
2802 mutex_lock(&stream
->metadata_cache
->lock
);
2803 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2804 if (stream
->metadata_in
!= stream
->metadata_out
)
2807 /* Metadata regenerated, change the version. */
2808 if (stream
->metadata_cache
->version
!= stream
->version
)
2809 stream
->version
= stream
->metadata_cache
->version
;
2811 len
= stream
->metadata_cache
->metadata_written
-
2812 stream
->metadata_in
;
2815 reserve_len
= min_t(size_t,
2816 stream
->transport
->ops
.packet_avail_size(chan
),
2818 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2821 * If reservation failed, return an error to the caller.
2823 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2825 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2826 stream
->coherent
= false;
2829 stream
->transport
->ops
.event_write(&ctx
,
2830 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2832 stream
->transport
->ops
.event_commit(&ctx
);
2833 stream
->metadata_in
+= reserve_len
;
2834 if (reserve_len
< len
)
2835 stream
->coherent
= false;
2837 stream
->coherent
= true;
2842 *coherent
= stream
->coherent
;
2843 mutex_unlock(&stream
->metadata_cache
->lock
);
2848 void lttng_metadata_begin(struct lttng_session
*session
)
2850 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2851 mutex_lock(&session
->metadata_cache
->lock
);
2855 void lttng_metadata_end(struct lttng_session
*session
)
2857 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2858 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2859 struct lttng_metadata_stream
*stream
;
2861 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2862 wake_up_interruptible(&stream
->read_wait
);
2863 mutex_unlock(&session
->metadata_cache
->lock
);
2868 * Write the metadata to the metadata cache.
2869 * Must be called with sessions_mutex held.
2870 * The metadata cache lock protects us from concurrent read access from
2871 * thread outputting metadata content to ring buffer.
2872 * The content of the printf is printed as a single atomic metadata
2875 int lttng_metadata_printf(struct lttng_session
*session
,
2876 const char *fmt
, ...)
2882 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2885 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2891 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2892 if (session
->metadata_cache
->metadata_written
+ len
>
2893 session
->metadata_cache
->cache_alloc
) {
2894 char *tmp_cache_realloc
;
2895 unsigned int tmp_cache_alloc_size
;
2897 tmp_cache_alloc_size
= max_t(unsigned int,
2898 session
->metadata_cache
->cache_alloc
+ len
,
2899 session
->metadata_cache
->cache_alloc
<< 1);
2900 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2901 if (!tmp_cache_realloc
)
2903 if (session
->metadata_cache
->data
) {
2904 memcpy(tmp_cache_realloc
,
2905 session
->metadata_cache
->data
,
2906 session
->metadata_cache
->cache_alloc
);
2907 vfree(session
->metadata_cache
->data
);
2910 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2911 session
->metadata_cache
->data
= tmp_cache_realloc
;
2913 memcpy(session
->metadata_cache
->data
+
2914 session
->metadata_cache
->metadata_written
,
2916 session
->metadata_cache
->metadata_written
+= len
;
2927 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2931 for (i
= 0; i
< nesting
; i
++) {
2934 ret
= lttng_metadata_printf(session
, " ");
2943 int lttng_field_name_statedump(struct lttng_session
*session
,
2944 const struct lttng_event_field
*field
,
2947 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2951 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2952 const struct lttng_type
*type
,
2957 WARN_ON_ONCE(type
->atype
!= atype_integer
);
2958 ret
= print_tabs(session
, nesting
);
2961 ret
= lttng_metadata_printf(session
,
2962 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2963 type
->u
.integer
.size
,
2964 type
->u
.integer
.alignment
,
2965 type
->u
.integer
.signedness
,
2966 (type
->u
.integer
.encoding
== lttng_encode_none
)
2968 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
2971 type
->u
.integer
.base
,
2972 #if __BYTE_ORDER == __BIG_ENDIAN
2973 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
2975 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
2982 * Must be called with sessions_mutex held.
2985 int _lttng_struct_type_statedump(struct lttng_session
*session
,
2986 const struct lttng_type
*type
,
2990 uint32_t i
, nr_fields
;
2991 unsigned int alignment
;
2993 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
2995 ret
= print_tabs(session
, nesting
);
2998 ret
= lttng_metadata_printf(session
,
3002 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
3003 for (i
= 0; i
< nr_fields
; i
++) {
3004 const struct lttng_event_field
*iter_field
;
3006 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
3007 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3011 ret
= print_tabs(session
, nesting
);
3014 alignment
= type
->u
.struct_nestable
.alignment
;
3016 ret
= lttng_metadata_printf(session
,
3020 ret
= lttng_metadata_printf(session
,
3027 * Must be called with sessions_mutex held.
3030 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3031 const struct lttng_event_field
*field
,
3036 ret
= _lttng_struct_type_statedump(session
,
3037 &field
->type
, nesting
);
3040 return lttng_field_name_statedump(session
, field
, nesting
);
3044 * Must be called with sessions_mutex held.
3047 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3048 const struct lttng_type
*type
,
3052 uint32_t i
, nr_choices
;
3054 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
3056 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3058 if (type
->u
.variant_nestable
.alignment
!= 0)
3060 ret
= print_tabs(session
, nesting
);
3063 ret
= lttng_metadata_printf(session
,
3064 "variant <_%s> {\n",
3065 type
->u
.variant_nestable
.tag_name
);
3068 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
3069 for (i
= 0; i
< nr_choices
; i
++) {
3070 const struct lttng_event_field
*iter_field
;
3072 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
3073 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3077 ret
= print_tabs(session
, nesting
);
3080 ret
= lttng_metadata_printf(session
,
3086 * Must be called with sessions_mutex held.
3089 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3090 const struct lttng_event_field
*field
,
3095 ret
= _lttng_variant_type_statedump(session
,
3096 &field
->type
, nesting
);
3099 return lttng_field_name_statedump(session
, field
, nesting
);
3103 * Must be called with sessions_mutex held.
3106 int _lttng_array_field_statedump(struct lttng_session
*session
,
3107 const struct lttng_event_field
*field
,
3111 const struct lttng_type
*elem_type
;
3113 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
3115 if (field
->type
.u
.array_nestable
.alignment
) {
3116 ret
= print_tabs(session
, nesting
);
3119 ret
= lttng_metadata_printf(session
,
3120 "struct { } align(%u) _%s_padding;\n",
3121 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
3127 * Nested compound types: Only array of structures and variants are
3128 * currently supported.
3130 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
3131 switch (elem_type
->atype
) {
3133 case atype_struct_nestable
:
3134 case atype_variant_nestable
:
3135 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3143 ret
= lttng_metadata_printf(session
,
3146 field
->type
.u
.array_nestable
.length
);
3151 * Must be called with sessions_mutex held.
3154 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3155 const struct lttng_event_field
*field
,
3159 const char *length_name
;
3160 const struct lttng_type
*elem_type
;
3162 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
3164 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
3166 if (field
->type
.u
.sequence_nestable
.alignment
) {
3167 ret
= print_tabs(session
, nesting
);
3170 ret
= lttng_metadata_printf(session
,
3171 "struct { } align(%u) _%s_padding;\n",
3172 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
3179 * Nested compound types: Only array of structures and variants are
3180 * currently supported.
3182 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
3183 switch (elem_type
->atype
) {
3185 case atype_struct_nestable
:
3186 case atype_variant_nestable
:
3187 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3195 ret
= lttng_metadata_printf(session
,
3198 field
->type
.u
.sequence_nestable
.length_name
);
3203 * Must be called with sessions_mutex held.
3206 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3207 const struct lttng_type
*type
,
3210 const struct lttng_enum_desc
*enum_desc
;
3211 const struct lttng_type
*container_type
;
3213 unsigned int i
, nr_entries
;
3215 container_type
= type
->u
.enum_nestable
.container_type
;
3216 if (container_type
->atype
!= atype_integer
) {
3220 enum_desc
= type
->u
.enum_nestable
.desc
;
3221 nr_entries
= enum_desc
->nr_entries
;
3223 ret
= print_tabs(session
, nesting
);
3226 ret
= lttng_metadata_printf(session
, "enum : ");
3229 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
3232 ret
= lttng_metadata_printf(session
, " {\n");
3235 /* Dump all entries */
3236 for (i
= 0; i
< nr_entries
; i
++) {
3237 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
3240 ret
= print_tabs(session
, nesting
+ 1);
3243 ret
= lttng_metadata_printf(session
,
3247 len
= strlen(entry
->string
);
3248 /* Escape the character '"' */
3249 for (j
= 0; j
< len
; j
++) {
3250 char c
= entry
->string
[j
];
3254 ret
= lttng_metadata_printf(session
,
3258 ret
= lttng_metadata_printf(session
,
3262 ret
= lttng_metadata_printf(session
,
3269 ret
= lttng_metadata_printf(session
, "\"");
3273 if (entry
->options
.is_auto
) {
3274 ret
= lttng_metadata_printf(session
, ",\n");
3278 ret
= lttng_metadata_printf(session
,
3282 if (entry
->start
.signedness
)
3283 ret
= lttng_metadata_printf(session
,
3284 "%lld", (long long) entry
->start
.value
);
3286 ret
= lttng_metadata_printf(session
,
3287 "%llu", entry
->start
.value
);
3290 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3292 == entry
->end
.value
) {
3293 ret
= lttng_metadata_printf(session
,
3296 if (entry
->end
.signedness
) {
3297 ret
= lttng_metadata_printf(session
,
3299 (long long) entry
->end
.value
);
3301 ret
= lttng_metadata_printf(session
,
3310 ret
= print_tabs(session
, nesting
);
3313 ret
= lttng_metadata_printf(session
, "}");
3319 * Must be called with sessions_mutex held.
3322 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3323 const struct lttng_event_field
*field
,
3328 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3331 return lttng_field_name_statedump(session
, field
, nesting
);
3335 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3336 const struct lttng_event_field
*field
,
3341 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3344 return lttng_field_name_statedump(session
, field
, nesting
);
3348 int _lttng_string_type_statedump(struct lttng_session
*session
,
3349 const struct lttng_type
*type
,
3354 WARN_ON_ONCE(type
->atype
!= atype_string
);
3355 /* Default encoding is UTF8 */
3356 ret
= print_tabs(session
, nesting
);
3359 ret
= lttng_metadata_printf(session
,
3361 type
->u
.string
.encoding
== lttng_encode_ASCII
?
3362 " { encoding = ASCII; }" : "");
3367 int _lttng_string_field_statedump(struct lttng_session
*session
,
3368 const struct lttng_event_field
*field
,
3373 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
3374 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3377 return lttng_field_name_statedump(session
, field
, nesting
);
3381 * Must be called with sessions_mutex held.
3384 int _lttng_type_statedump(struct lttng_session
*session
,
3385 const struct lttng_type
*type
,
3390 switch (type
->atype
) {
3392 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3394 case atype_enum_nestable
:
3395 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3398 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3400 case atype_struct_nestable
:
3401 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3403 case atype_variant_nestable
:
3404 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3407 /* Nested arrays and sequences are not supported yet. */
3408 case atype_array_nestable
:
3409 case atype_sequence_nestable
:
3418 * Must be called with sessions_mutex held.
3421 int _lttng_field_statedump(struct lttng_session
*session
,
3422 const struct lttng_event_field
*field
,
3427 switch (field
->type
.atype
) {
3429 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3431 case atype_enum_nestable
:
3432 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3435 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3437 case atype_struct_nestable
:
3438 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3440 case atype_array_nestable
:
3441 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3443 case atype_sequence_nestable
:
3444 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3446 case atype_variant_nestable
:
3447 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3458 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3459 struct lttng_ctx
*ctx
)
3466 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3467 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3469 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3477 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3478 struct lttng_event
*event
)
3480 const struct lttng_event_desc
*desc
= event
->desc
;
3484 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3485 const struct lttng_event_field
*field
= &desc
->fields
[i
];
3487 ret
= _lttng_field_statedump(session
, field
, 2);
3495 * Must be called with sessions_mutex held.
3496 * The entire event metadata is printed as a single atomic metadata
3500 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3501 struct lttng_channel
*chan
,
3502 struct lttng_event
*event
)
3506 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3508 if (chan
->channel_type
== METADATA_CHANNEL
)
3511 lttng_metadata_begin(session
);
3513 ret
= lttng_metadata_printf(session
,
3517 " stream_id = %u;\n",
3525 ret
= lttng_metadata_printf(session
,
3526 " context := struct {\n");
3530 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3534 ret
= lttng_metadata_printf(session
,
3540 ret
= lttng_metadata_printf(session
,
3541 " fields := struct {\n"
3546 ret
= _lttng_fields_metadata_statedump(session
, event
);
3551 * LTTng space reservation can only reserve multiples of the
3554 ret
= lttng_metadata_printf(session
,
3560 event
->metadata_dumped
= 1;
3562 lttng_metadata_end(session
);
3568 * Must be called with sessions_mutex held.
3569 * The entire channel metadata is printed as a single atomic metadata
3573 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3574 struct lttng_channel
*chan
)
3578 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3581 if (chan
->channel_type
== METADATA_CHANNEL
)
3584 lttng_metadata_begin(session
);
3586 WARN_ON_ONCE(!chan
->header_type
);
3587 ret
= lttng_metadata_printf(session
,
3590 " event.header := %s;\n"
3591 " packet.context := struct packet_context;\n",
3593 chan
->header_type
== 1 ? "struct event_header_compact" :
3594 "struct event_header_large");
3599 ret
= lttng_metadata_printf(session
,
3600 " event.context := struct {\n");
3604 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3608 ret
= lttng_metadata_printf(session
,
3614 ret
= lttng_metadata_printf(session
,
3617 chan
->metadata_dumped
= 1;
3619 lttng_metadata_end(session
);
3624 * Must be called with sessions_mutex held.
3627 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3629 return lttng_metadata_printf(session
,
3630 "struct packet_context {\n"
3631 " uint64_clock_monotonic_t timestamp_begin;\n"
3632 " uint64_clock_monotonic_t timestamp_end;\n"
3633 " uint64_t content_size;\n"
3634 " uint64_t packet_size;\n"
3635 " uint64_t packet_seq_num;\n"
3636 " unsigned long events_discarded;\n"
3637 " uint32_t cpu_id;\n"
3644 * id: range: 0 - 30.
3645 * id 31 is reserved to indicate an extended header.
3648 * id: range: 0 - 65534.
3649 * id 65535 is reserved to indicate an extended header.
3651 * Must be called with sessions_mutex held.
3654 int _lttng_event_header_declare(struct lttng_session
*session
)
3656 return lttng_metadata_printf(session
,
3657 "struct event_header_compact {\n"
3658 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3661 " uint27_clock_monotonic_t timestamp;\n"
3665 " uint64_clock_monotonic_t timestamp;\n"
3670 "struct event_header_large {\n"
3671 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3674 " uint32_clock_monotonic_t timestamp;\n"
3678 " uint64_clock_monotonic_t timestamp;\n"
3682 lttng_alignof(uint32_t) * CHAR_BIT
,
3683 lttng_alignof(uint16_t) * CHAR_BIT
3688 * Approximation of NTP time of day to clock monotonic correlation,
3689 * taken at start of trace.
3690 * Yes, this is only an approximation. Yes, we can (and will) do better
3691 * in future versions.
3692 * This function may return a negative offset. It may happen if the
3693 * system sets the REALTIME clock to 0 after boot.
3695 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3699 int64_t measure_clock_offset(void)
3701 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3702 uint64_t tcf
= trace_clock_freq();
3704 unsigned long flags
;
3705 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3706 struct timespec64 rts
= { 0, 0 };
3708 struct timespec rts
= { 0, 0 };
3711 /* Disable interrupts to increase correlation precision. */
3712 local_irq_save(flags
);
3713 monotonic
[0] = trace_clock_read64();
3714 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3715 ktime_get_real_ts64(&rts
);
3717 getnstimeofday(&rts
);
3719 monotonic
[1] = trace_clock_read64();
3720 local_irq_restore(flags
);
3722 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3723 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3724 if (tcf
== NSEC_PER_SEC
) {
3725 realtime
+= rts
.tv_nsec
;
3727 uint64_t n
= rts
.tv_nsec
* tcf
;
3729 do_div(n
, NSEC_PER_SEC
);
3732 offset
= (int64_t) realtime
- monotonic_avg
;
3737 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3745 while (cur
!= '\0') {
3748 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3752 ret
= lttng_metadata_printf(session
, "%c", '\\');
3755 /* We still print the current char */
3758 ret
= lttng_metadata_printf(session
, "%c", cur
);
3772 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3773 const char *field_value
)
3777 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3781 ret
= print_escaped_ctf_string(session
, field_value
);
3785 ret
= lttng_metadata_printf(session
, "\";\n");
3792 * Output metadata into this session's metadata buffers.
3793 * Must be called with sessions_mutex held.
3796 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3798 unsigned char *uuid_c
= session
->uuid
.b
;
3799 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3800 const char *product_uuid
;
3801 struct lttng_channel
*chan
;
3802 struct lttng_event
*event
;
3805 if (!LTTNG_READ_ONCE(session
->active
))
3808 lttng_metadata_begin(session
);
3810 if (session
->metadata_dumped
)
3813 snprintf(uuid_s
, sizeof(uuid_s
),
3814 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3815 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3816 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3817 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3818 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3820 ret
= lttng_metadata_printf(session
,
3821 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3822 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3823 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3824 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3825 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3826 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3827 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3833 " byte_order = %s;\n"
3834 " packet.header := struct {\n"
3835 " uint32_t magic;\n"
3836 " uint8_t uuid[16];\n"
3837 " uint32_t stream_id;\n"
3838 " uint64_t stream_instance_id;\n"
3841 lttng_alignof(uint8_t) * CHAR_BIT
,
3842 lttng_alignof(uint16_t) * CHAR_BIT
,
3843 lttng_alignof(uint32_t) * CHAR_BIT
,
3844 lttng_alignof(uint64_t) * CHAR_BIT
,
3845 sizeof(unsigned long) * CHAR_BIT
,
3846 lttng_alignof(unsigned long) * CHAR_BIT
,
3850 #if __BYTE_ORDER == __BIG_ENDIAN
3859 ret
= lttng_metadata_printf(session
,
3861 " hostname = \"%s\";\n"
3862 " domain = \"kernel\";\n"
3863 " sysname = \"%s\";\n"
3864 " kernel_release = \"%s\";\n"
3865 " kernel_version = \"%s\";\n"
3866 " tracer_name = \"lttng-modules\";\n"
3867 " tracer_major = %d;\n"
3868 " tracer_minor = %d;\n"
3869 " tracer_patchlevel = %d;\n"
3870 " trace_buffering_scheme = \"global\";\n",
3871 current
->nsproxy
->uts_ns
->name
.nodename
,
3875 LTTNG_MODULES_MAJOR_VERSION
,
3876 LTTNG_MODULES_MINOR_VERSION
,
3877 LTTNG_MODULES_PATCHLEVEL_VERSION
3882 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3885 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3886 session
->creation_time
);
3890 /* Add the product UUID to the 'env' section */
3891 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3893 ret
= lttng_metadata_printf(session
,
3894 " product_uuid = \"%s\";\n",
3901 /* Close the 'env' section */
3902 ret
= lttng_metadata_printf(session
, "};\n\n");
3906 ret
= lttng_metadata_printf(session
,
3908 " name = \"%s\";\n",
3914 if (!trace_clock_uuid(clock_uuid_s
)) {
3915 ret
= lttng_metadata_printf(session
,
3916 " uuid = \"%s\";\n",
3923 ret
= lttng_metadata_printf(session
,
3924 " description = \"%s\";\n"
3925 " freq = %llu; /* Frequency, in Hz */\n"
3926 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3929 trace_clock_description(),
3930 (unsigned long long) trace_clock_freq(),
3931 (long long) measure_clock_offset()
3936 ret
= lttng_metadata_printf(session
,
3937 "typealias integer {\n"
3938 " size = 27; align = 1; signed = false;\n"
3939 " map = clock.%s.value;\n"
3940 "} := uint27_clock_monotonic_t;\n"
3942 "typealias integer {\n"
3943 " size = 32; align = %u; signed = false;\n"
3944 " map = clock.%s.value;\n"
3945 "} := uint32_clock_monotonic_t;\n"
3947 "typealias integer {\n"
3948 " size = 64; align = %u; signed = false;\n"
3949 " map = clock.%s.value;\n"
3950 "} := uint64_clock_monotonic_t;\n\n",
3952 lttng_alignof(uint32_t) * CHAR_BIT
,
3954 lttng_alignof(uint64_t) * CHAR_BIT
,
3960 ret
= _lttng_stream_packet_context_declare(session
);
3964 ret
= _lttng_event_header_declare(session
);
3969 list_for_each_entry(chan
, &session
->chan
, list
) {
3970 ret
= _lttng_channel_metadata_statedump(session
, chan
);
3975 list_for_each_entry(event
, &session
->events
, list
) {
3976 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
3980 session
->metadata_dumped
= 1;
3982 lttng_metadata_end(session
);
3987 * lttng_transport_register - LTT transport registration
3988 * @transport: transport structure
3990 * Registers a transport which can be used as output to extract the data out of
3991 * LTTng. The module calling this registration function must ensure that no
3992 * trap-inducing code will be executed by the transport functions. E.g.
3993 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3994 * is made visible to the transport function. This registration acts as a
3995 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3996 * after its registration must it synchronize the TLBs.
3998 void lttng_transport_register(struct lttng_transport
*transport
)
4001 * Make sure no page fault can be triggered by the module about to be
4002 * registered. We deal with this here so we don't have to call
4003 * vmalloc_sync_mappings() in each module's init.
4005 wrapper_vmalloc_sync_mappings();
4007 mutex_lock(&sessions_mutex
);
4008 list_add_tail(&transport
->node
, <tng_transport_list
);
4009 mutex_unlock(&sessions_mutex
);
4011 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4014 * lttng_transport_unregister - LTT transport unregistration
4015 * @transport: transport structure
4017 void lttng_transport_unregister(struct lttng_transport
*transport
)
4019 mutex_lock(&sessions_mutex
);
4020 list_del(&transport
->node
);
4021 mutex_unlock(&sessions_mutex
);
4023 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4025 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4028 * Make sure no page fault can be triggered by the module about to be
4029 * registered. We deal with this here so we don't have to call
4030 * vmalloc_sync_mappings() in each module's init.
4032 wrapper_vmalloc_sync_mappings();
4034 mutex_lock(&sessions_mutex
);
4035 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4036 mutex_unlock(&sessions_mutex
);
4038 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4040 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4042 mutex_lock(&sessions_mutex
);
4043 list_del(&transport
->node
);
4044 mutex_unlock(&sessions_mutex
);
4046 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4048 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4050 enum cpuhp_state lttng_hp_prepare
;
4051 enum cpuhp_state lttng_hp_online
;
4053 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4055 struct lttng_cpuhp_node
*lttng_node
;
4057 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4058 switch (lttng_node
->component
) {
4059 case LTTNG_RING_BUFFER_FRONTEND
:
4061 case LTTNG_RING_BUFFER_BACKEND
:
4062 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4063 case LTTNG_RING_BUFFER_ITER
:
4065 case LTTNG_CONTEXT_PERF_COUNTERS
:
4072 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4074 struct lttng_cpuhp_node
*lttng_node
;
4076 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4077 switch (lttng_node
->component
) {
4078 case LTTNG_RING_BUFFER_FRONTEND
:
4079 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4080 case LTTNG_RING_BUFFER_BACKEND
:
4082 case LTTNG_RING_BUFFER_ITER
:
4084 case LTTNG_CONTEXT_PERF_COUNTERS
:
4085 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4091 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4093 struct lttng_cpuhp_node
*lttng_node
;
4095 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4096 switch (lttng_node
->component
) {
4097 case LTTNG_RING_BUFFER_FRONTEND
:
4098 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4099 case LTTNG_RING_BUFFER_BACKEND
:
4101 case LTTNG_RING_BUFFER_ITER
:
4102 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4103 case LTTNG_CONTEXT_PERF_COUNTERS
:
4104 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4110 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4112 struct lttng_cpuhp_node
*lttng_node
;
4114 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4115 switch (lttng_node
->component
) {
4116 case LTTNG_RING_BUFFER_FRONTEND
:
4117 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4118 case LTTNG_RING_BUFFER_BACKEND
:
4120 case LTTNG_RING_BUFFER_ITER
:
4122 case LTTNG_CONTEXT_PERF_COUNTERS
:
4129 static int __init
lttng_init_cpu_hotplug(void)
4133 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4134 lttng_hotplug_prepare
,
4135 lttng_hotplug_dead
);
4139 lttng_hp_prepare
= ret
;
4140 lttng_rb_set_hp_prepare(ret
);
4142 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4143 lttng_hotplug_online
,
4144 lttng_hotplug_offline
);
4146 cpuhp_remove_multi_state(lttng_hp_prepare
);
4147 lttng_hp_prepare
= 0;
4150 lttng_hp_online
= ret
;
4151 lttng_rb_set_hp_online(ret
);
4156 static void __exit
lttng_exit_cpu_hotplug(void)
4158 lttng_rb_set_hp_online(0);
4159 cpuhp_remove_multi_state(lttng_hp_online
);
4160 lttng_rb_set_hp_prepare(0);
4161 cpuhp_remove_multi_state(lttng_hp_prepare
);
4164 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4165 static int lttng_init_cpu_hotplug(void)
4169 static void lttng_exit_cpu_hotplug(void)
4172 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4175 static int __init
lttng_events_init(void)
4179 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4182 ret
= wrapper_get_pfnblock_flags_mask_init();
4185 ret
= wrapper_get_pageblock_flags_mask_init();
4188 ret
= lttng_probes_init();
4191 ret
= lttng_context_init();
4194 ret
= lttng_tracepoint_init();
4197 event_cache
= KMEM_CACHE(lttng_event
, 0);
4200 goto error_kmem_event
;
4202 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4203 if (!event_notifier_cache
) {
4205 goto error_kmem_event_notifier
;
4207 ret
= lttng_abi_init();
4210 ret
= lttng_logger_init();
4213 ret
= lttng_init_cpu_hotplug();
4216 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4217 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4218 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4219 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4220 LTTNG_MODULES_EXTRAVERSION
,
4222 #ifdef LTTNG_EXTRA_VERSION_GIT
4223 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4227 #ifdef LTTNG_EXTRA_VERSION_NAME
4228 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4235 lttng_logger_exit();
4239 kmem_cache_destroy(event_notifier_cache
);
4240 error_kmem_event_notifier
:
4241 kmem_cache_destroy(event_cache
);
4243 lttng_tracepoint_exit();
4245 lttng_context_exit();
4246 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4247 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4248 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4249 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4250 LTTNG_MODULES_EXTRAVERSION
,
4252 #ifdef LTTNG_EXTRA_VERSION_GIT
4253 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4257 #ifdef LTTNG_EXTRA_VERSION_NAME
4258 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4265 module_init(lttng_events_init
);
4267 static void __exit
lttng_events_exit(void)
4269 struct lttng_session
*session
, *tmpsession
;
4271 lttng_exit_cpu_hotplug();
4272 lttng_logger_exit();
4274 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4275 lttng_session_destroy(session
);
4276 kmem_cache_destroy(event_cache
);
4277 kmem_cache_destroy(event_notifier_cache
);
4278 lttng_tracepoint_exit();
4279 lttng_context_exit();
4280 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4281 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4282 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4283 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4284 LTTNG_MODULES_EXTRAVERSION
,
4286 #ifdef LTTNG_EXTRA_VERSION_GIT
4287 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4291 #ifdef LTTNG_EXTRA_VERSION_NAME
4292 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4298 module_exit(lttng_events_exit
);
4300 #include <generated/patches.h>
4301 #ifdef LTTNG_EXTRA_VERSION_GIT
4302 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4304 #ifdef LTTNG_EXTRA_VERSION_NAME
4305 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4307 MODULE_LICENSE("GPL and additional rights");
4308 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4309 MODULE_DESCRIPTION("LTTng tracer");
4310 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4311 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4312 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4313 LTTNG_MODULES_EXTRAVERSION
);