1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/lttng-bytecode.h>
40 #include <lttng/tracer.h>
41 #include <lttng/event-notifier-notification.h>
42 #include <lttng/abi-old.h>
43 #include <lttng/endian.h>
44 #include <lttng/string-utils.h>
45 #include <lttng/utils.h>
46 #include <ringbuffer/backend.h>
47 #include <ringbuffer/frontend.h>
48 #include <wrapper/time.h>
50 #define METADATA_CACHE_DEFAULT_SIZE 4096
52 static LIST_HEAD(sessions
);
53 static LIST_HEAD(event_notifier_groups
);
54 static LIST_HEAD(lttng_transport_list
);
55 static LIST_HEAD(lttng_counter_transport_list
);
57 * Protect the sessions and metadata caches.
59 static DEFINE_MUTEX(sessions_mutex
);
60 static struct kmem_cache
*event_cache
;
61 static struct kmem_cache
*event_notifier_cache
;
63 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
64 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
65 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
66 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
67 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
69 static void _lttng_event_destroy(struct lttng_event
*event
);
70 static void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
);
71 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
72 static int _lttng_event_unregister(struct lttng_event
*event
);
73 static int _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
);
75 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
76 struct lttng_channel
*chan
,
77 struct lttng_event
*event
);
79 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
81 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
83 int _lttng_type_statedump(struct lttng_session
*session
,
84 const struct lttng_type
*type
,
87 int _lttng_field_statedump(struct lttng_session
*session
,
88 const struct lttng_event_field
*field
,
91 void synchronize_trace(void)
93 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
99 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
100 #ifdef CONFIG_PREEMPT_RT_FULL
103 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
104 #ifdef CONFIG_PREEMPT_RT
107 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
110 void lttng_lock_sessions(void)
112 mutex_lock(&sessions_mutex
);
115 void lttng_unlock_sessions(void)
117 mutex_unlock(&sessions_mutex
);
120 static struct lttng_transport
*lttng_transport_find(const char *name
)
122 struct lttng_transport
*transport
;
124 list_for_each_entry(transport
, <tng_transport_list
, node
) {
125 if (!strcmp(transport
->name
, name
))
132 * Called with sessions lock held.
134 int lttng_session_active(void)
136 struct lttng_session
*iter
;
138 list_for_each_entry(iter
, &sessions
, list
) {
145 struct lttng_session
*lttng_session_create(void)
147 struct lttng_session
*session
;
148 struct lttng_metadata_cache
*metadata_cache
;
151 mutex_lock(&sessions_mutex
);
152 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
155 INIT_LIST_HEAD(&session
->chan
);
156 INIT_LIST_HEAD(&session
->events
);
157 lttng_guid_gen(&session
->uuid
);
159 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
162 goto err_free_session
;
163 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
164 if (!metadata_cache
->data
)
166 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
167 kref_init(&metadata_cache
->refcount
);
168 mutex_init(&metadata_cache
->lock
);
169 session
->metadata_cache
= metadata_cache
;
170 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
171 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
172 sizeof(metadata_cache
->uuid
));
173 INIT_LIST_HEAD(&session
->enablers_head
);
174 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
175 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
176 list_add(&session
->list
, &sessions
);
177 session
->pid_tracker
.session
= session
;
178 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
179 session
->vpid_tracker
.session
= session
;
180 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
181 session
->uid_tracker
.session
= session
;
182 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
183 session
->vuid_tracker
.session
= session
;
184 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
185 session
->gid_tracker
.session
= session
;
186 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
187 session
->vgid_tracker
.session
= session
;
188 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
189 mutex_unlock(&sessions_mutex
);
193 kfree(metadata_cache
);
195 lttng_kvfree(session
);
197 mutex_unlock(&sessions_mutex
);
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
;
953 * Populate lttng_event structure before kretprobe registration.
956 ret
= lttng_kretprobes_register(event_name
,
957 event_param
->u
.kretprobe
.symbol_name
,
958 event_param
->u
.kretprobe
.offset
,
959 event_param
->u
.kretprobe
.addr
,
960 event
, event_return
);
962 kmem_cache_free(event_cache
, event_return
);
966 /* Take 2 refs on the module: one per event. */
967 ret
= try_module_get(event
->desc
->owner
);
969 ret
= try_module_get(event
->desc
->owner
);
971 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
973 WARN_ON_ONCE(ret
> 0);
975 kmem_cache_free(event_cache
, event_return
);
976 module_put(event
->desc
->owner
);
977 module_put(event
->desc
->owner
);
978 goto statedump_error
;
980 list_add(&event_return
->list
, &chan
->session
->events
);
983 case LTTNG_KERNEL_NOOP
:
984 case LTTNG_KERNEL_SYSCALL
:
986 * Needs to be explicitly enabled after creation, since
987 * we may want to apply filters.
990 event
->registered
= 0;
991 event
->desc
= event_desc
;
992 switch (event_param
->u
.syscall
.entryexit
) {
993 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
996 case LTTNG_KERNEL_SYSCALL_ENTRY
:
997 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
999 case LTTNG_KERNEL_SYSCALL_EXIT
:
1000 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1003 switch (event_param
->u
.syscall
.abi
) {
1004 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1006 goto register_error
;
1007 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1008 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1010 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1011 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1016 goto register_error
;
1019 case LTTNG_KERNEL_UPROBE
:
1021 * Needs to be explicitly enabled after creation, since
1022 * we may want to apply filters.
1025 event
->registered
= 1;
1028 * Populate lttng_event structure before event
1033 ret
= lttng_uprobes_register_event(event_param
->name
,
1034 event_param
->u
.uprobe
.fd
,
1037 goto register_error
;
1038 ret
= try_module_get(event
->desc
->owner
);
1041 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1045 goto register_error
;
1047 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
1048 WARN_ON_ONCE(ret
> 0);
1050 goto statedump_error
;
1052 hlist_add_head(&event
->hlist
, head
);
1053 list_add(&event
->list
, &chan
->session
->events
);
1057 /* If a statedump error occurs, events will not be readable. */
1059 kmem_cache_free(event_cache
, event
);
1064 return ERR_PTR(ret
);
1067 struct lttng_event_notifier
*_lttng_event_notifier_create(
1068 const struct lttng_event_desc
*event_desc
,
1069 uint64_t token
, uint64_t error_counter_index
,
1070 struct lttng_event_notifier_group
*event_notifier_group
,
1071 struct lttng_kernel_event_notifier
*event_notifier_param
,
1072 void *filter
, enum lttng_kernel_instrumentation itype
)
1074 struct lttng_event_notifier
*event_notifier
;
1075 struct lttng_counter
*error_counter
;
1076 const char *event_name
;
1077 struct hlist_head
*head
;
1081 case LTTNG_KERNEL_TRACEPOINT
:
1082 event_name
= event_desc
->name
;
1084 case LTTNG_KERNEL_KPROBE
:
1085 case LTTNG_KERNEL_UPROBE
:
1086 case LTTNG_KERNEL_SYSCALL
:
1087 event_name
= event_notifier_param
->event
.name
;
1089 case LTTNG_KERNEL_KRETPROBE
:
1090 case LTTNG_KERNEL_FUNCTION
:
1091 case LTTNG_KERNEL_NOOP
:
1098 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1099 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1100 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1101 WARN_ON_ONCE(!event_notifier
->desc
);
1102 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1103 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1104 && event_notifier_group
== event_notifier
->group
1105 && token
== event_notifier
->user_token
) {
1111 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1112 if (!event_notifier
) {
1117 event_notifier
->group
= event_notifier_group
;
1118 event_notifier
->user_token
= token
;
1119 event_notifier
->error_counter_index
= error_counter_index
;
1120 event_notifier
->num_captures
= 0;
1121 event_notifier
->filter
= filter
;
1122 event_notifier
->instrumentation
= itype
;
1123 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1124 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1125 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1126 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1127 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1130 case LTTNG_KERNEL_TRACEPOINT
:
1131 /* Event will be enabled by enabler sync. */
1132 event_notifier
->enabled
= 0;
1133 event_notifier
->registered
= 0;
1134 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1135 if (!event_notifier
->desc
) {
1137 goto register_error
;
1139 /* Populate lttng_event_notifier structure before event registration. */
1142 case LTTNG_KERNEL_KPROBE
:
1144 * Needs to be explicitly enabled after creation, since
1145 * we may want to apply filters.
1147 event_notifier
->enabled
= 0;
1148 event_notifier
->registered
= 1;
1150 * Populate lttng_event_notifier structure before event
1154 ret
= lttng_kprobes_register_event_notifier(
1155 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1156 event_notifier_param
->event
.u
.kprobe
.offset
,
1157 event_notifier_param
->event
.u
.kprobe
.addr
,
1161 goto register_error
;
1163 ret
= try_module_get(event_notifier
->desc
->owner
);
1166 case LTTNG_KERNEL_NOOP
:
1167 case LTTNG_KERNEL_SYSCALL
:
1169 * Needs to be explicitly enabled after creation, since
1170 * we may want to apply filters.
1172 event_notifier
->enabled
= 0;
1173 event_notifier
->registered
= 0;
1174 event_notifier
->desc
= event_desc
;
1175 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1176 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1178 goto register_error
;
1179 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1180 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1182 case LTTNG_KERNEL_SYSCALL_EXIT
:
1183 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1186 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1187 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1189 goto register_error
;
1190 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1191 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1193 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1194 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1198 if (!event_notifier
->desc
) {
1200 goto register_error
;
1203 case LTTNG_KERNEL_UPROBE
:
1205 * Needs to be explicitly enabled after creation, since
1206 * we may want to apply filters.
1208 event_notifier
->enabled
= 0;
1209 event_notifier
->registered
= 1;
1212 * Populate lttng_event_notifier structure before
1213 * event_notifier registration.
1217 ret
= lttng_uprobes_register_event_notifier(
1218 event_notifier_param
->event
.name
,
1219 event_notifier_param
->event
.u
.uprobe
.fd
,
1222 goto register_error
;
1223 ret
= try_module_get(event_notifier
->desc
->owner
);
1226 case LTTNG_KERNEL_KRETPROBE
:
1227 case LTTNG_KERNEL_FUNCTION
:
1231 goto register_error
;
1234 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1235 hlist_add_head(&event_notifier
->hlist
, head
);
1238 * Clear the error counter bucket. The sessiond keeps track of which
1239 * bucket is currently in use. We trust it. The session lock
1240 * synchronizes against concurrent creation of the error
1243 error_counter
= event_notifier_group
->error_counter
;
1244 if (error_counter
) {
1245 size_t dimension_index
[1];
1248 * Check that the index is within the boundary of the counter.
1250 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1251 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1252 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1254 goto register_error
;
1257 dimension_index
[0] = event_notifier
->error_counter_index
;
1258 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1260 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1261 event_notifier
->error_counter_index
);
1262 goto register_error
;
1266 return event_notifier
;
1269 kmem_cache_free(event_notifier_cache
, event_notifier
);
1273 return ERR_PTR(ret
);
1276 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1277 const size_t *dim_indexes
, int32_t cpu
,
1278 int64_t *val
, bool *overflow
, bool *underflow
)
1280 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1281 cpu
, val
, overflow
, underflow
);
1284 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1285 const size_t *dim_indexes
, int64_t *val
,
1286 bool *overflow
, bool *underflow
)
1288 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1289 val
, overflow
, underflow
);
1292 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1293 const size_t *dim_indexes
)
1295 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1298 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1299 struct lttng_kernel_event
*event_param
,
1301 const struct lttng_event_desc
*event_desc
,
1302 enum lttng_kernel_instrumentation itype
)
1304 struct lttng_event
*event
;
1306 mutex_lock(&sessions_mutex
);
1307 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1309 mutex_unlock(&sessions_mutex
);
1313 struct lttng_event_notifier
*lttng_event_notifier_create(
1314 const struct lttng_event_desc
*event_desc
,
1315 uint64_t id
, uint64_t error_counter_index
,
1316 struct lttng_event_notifier_group
*event_notifier_group
,
1317 struct lttng_kernel_event_notifier
*event_notifier_param
,
1318 void *filter
, enum lttng_kernel_instrumentation itype
)
1320 struct lttng_event_notifier
*event_notifier
;
1322 mutex_lock(&sessions_mutex
);
1323 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1324 error_counter_index
, event_notifier_group
,
1325 event_notifier_param
, filter
, itype
);
1326 mutex_unlock(&sessions_mutex
);
1327 return event_notifier
;
1330 /* Only used for tracepoints for now. */
1332 void register_event(struct lttng_event
*event
)
1334 const struct lttng_event_desc
*desc
;
1337 if (event
->registered
)
1341 switch (event
->instrumentation
) {
1342 case LTTNG_KERNEL_TRACEPOINT
:
1343 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1344 desc
->probe_callback
,
1347 case LTTNG_KERNEL_SYSCALL
:
1348 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1350 case LTTNG_KERNEL_KPROBE
:
1351 case LTTNG_KERNEL_UPROBE
:
1352 case LTTNG_KERNEL_KRETPROBE
:
1353 case LTTNG_KERNEL_NOOP
:
1356 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1361 event
->registered
= 1;
1365 * Only used internally at session destruction.
1367 int _lttng_event_unregister(struct lttng_event
*event
)
1369 const struct lttng_event_desc
*desc
;
1372 if (!event
->registered
)
1376 switch (event
->instrumentation
) {
1377 case LTTNG_KERNEL_TRACEPOINT
:
1378 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1379 event
->desc
->probe_callback
,
1382 case LTTNG_KERNEL_KPROBE
:
1383 lttng_kprobes_unregister_event(event
);
1386 case LTTNG_KERNEL_KRETPROBE
:
1387 lttng_kretprobes_unregister(event
);
1390 case LTTNG_KERNEL_SYSCALL
:
1391 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1393 case LTTNG_KERNEL_NOOP
:
1396 case LTTNG_KERNEL_UPROBE
:
1397 lttng_uprobes_unregister_event(event
);
1400 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1405 event
->registered
= 0;
1409 /* Only used for tracepoints for now. */
1411 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1413 const struct lttng_event_desc
*desc
;
1416 if (event_notifier
->registered
)
1419 desc
= event_notifier
->desc
;
1420 switch (event_notifier
->instrumentation
) {
1421 case LTTNG_KERNEL_TRACEPOINT
:
1422 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1423 desc
->event_notifier_callback
,
1426 case LTTNG_KERNEL_SYSCALL
:
1427 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1429 case LTTNG_KERNEL_KPROBE
:
1430 case LTTNG_KERNEL_UPROBE
:
1433 case LTTNG_KERNEL_KRETPROBE
:
1434 case LTTNG_KERNEL_FUNCTION
:
1435 case LTTNG_KERNEL_NOOP
:
1440 event_notifier
->registered
= 1;
1444 int _lttng_event_notifier_unregister(
1445 struct lttng_event_notifier
*event_notifier
)
1447 const struct lttng_event_desc
*desc
;
1450 if (!event_notifier
->registered
)
1453 desc
= event_notifier
->desc
;
1454 switch (event_notifier
->instrumentation
) {
1455 case LTTNG_KERNEL_TRACEPOINT
:
1456 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1457 event_notifier
->desc
->event_notifier_callback
,
1460 case LTTNG_KERNEL_KPROBE
:
1461 lttng_kprobes_unregister_event_notifier(event_notifier
);
1464 case LTTNG_KERNEL_UPROBE
:
1465 lttng_uprobes_unregister_event_notifier(event_notifier
);
1468 case LTTNG_KERNEL_SYSCALL
:
1469 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1471 case LTTNG_KERNEL_KRETPROBE
:
1472 case LTTNG_KERNEL_FUNCTION
:
1473 case LTTNG_KERNEL_NOOP
:
1478 event_notifier
->registered
= 0;
1483 * Only used internally at session destruction.
1486 void _lttng_event_destroy(struct lttng_event
*event
)
1488 switch (event
->instrumentation
) {
1489 case LTTNG_KERNEL_TRACEPOINT
:
1490 lttng_event_desc_put(event
->desc
);
1492 case LTTNG_KERNEL_KPROBE
:
1493 module_put(event
->desc
->owner
);
1494 lttng_kprobes_destroy_event_private(event
);
1496 case LTTNG_KERNEL_KRETPROBE
:
1497 module_put(event
->desc
->owner
);
1498 lttng_kretprobes_destroy_private(event
);
1500 case LTTNG_KERNEL_NOOP
:
1501 case LTTNG_KERNEL_SYSCALL
:
1503 case LTTNG_KERNEL_UPROBE
:
1504 module_put(event
->desc
->owner
);
1505 lttng_uprobes_destroy_event_private(event
);
1507 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1511 list_del(&event
->list
);
1512 lttng_destroy_context(event
->ctx
);
1513 kmem_cache_free(event_cache
, event
);
1517 * Only used internally at session destruction.
1520 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1522 switch (event_notifier
->instrumentation
) {
1523 case LTTNG_KERNEL_TRACEPOINT
:
1524 lttng_event_desc_put(event_notifier
->desc
);
1526 case LTTNG_KERNEL_KPROBE
:
1527 module_put(event_notifier
->desc
->owner
);
1528 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1530 case LTTNG_KERNEL_NOOP
:
1531 case LTTNG_KERNEL_SYSCALL
:
1533 case LTTNG_KERNEL_UPROBE
:
1534 module_put(event_notifier
->desc
->owner
);
1535 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1537 case LTTNG_KERNEL_KRETPROBE
:
1538 case LTTNG_KERNEL_FUNCTION
:
1542 list_del(&event_notifier
->list
);
1543 kmem_cache_free(event_notifier_cache
, event_notifier
);
1546 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1547 enum tracker_type tracker_type
)
1549 switch (tracker_type
) {
1551 return &session
->pid_tracker
;
1553 return &session
->vpid_tracker
;
1555 return &session
->uid_tracker
;
1557 return &session
->vuid_tracker
;
1559 return &session
->gid_tracker
;
1561 return &session
->vgid_tracker
;
1568 int lttng_session_track_id(struct lttng_session
*session
,
1569 enum tracker_type tracker_type
, int id
)
1571 struct lttng_id_tracker
*tracker
;
1574 tracker
= get_tracker(session
, tracker_type
);
1579 mutex_lock(&sessions_mutex
);
1581 /* track all ids: destroy tracker. */
1582 lttng_id_tracker_destroy(tracker
, true);
1585 ret
= lttng_id_tracker_add(tracker
, id
);
1587 mutex_unlock(&sessions_mutex
);
1591 int lttng_session_untrack_id(struct lttng_session
*session
,
1592 enum tracker_type tracker_type
, int id
)
1594 struct lttng_id_tracker
*tracker
;
1597 tracker
= get_tracker(session
, tracker_type
);
1602 mutex_lock(&sessions_mutex
);
1604 /* untrack all ids: replace by empty tracker. */
1605 ret
= lttng_id_tracker_empty_set(tracker
);
1607 ret
= lttng_id_tracker_del(tracker
, id
);
1609 mutex_unlock(&sessions_mutex
);
1614 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1616 struct lttng_id_tracker
*id_tracker
= m
->private;
1617 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1618 struct lttng_id_hash_node
*e
;
1621 mutex_lock(&sessions_mutex
);
1623 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1624 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1626 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1632 /* ID tracker disabled. */
1633 if (iter
>= *pos
&& iter
== 0) {
1634 return id_tracker_p
; /* empty tracker */
1642 /* Called with sessions_mutex held. */
1644 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1646 struct lttng_id_tracker
*id_tracker
= m
->private;
1647 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1648 struct lttng_id_hash_node
*e
;
1653 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1654 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1656 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1657 if (iter
++ >= *ppos
)
1662 /* ID tracker disabled. */
1663 if (iter
>= *ppos
&& iter
== 0)
1664 return p
; /* empty tracker */
1673 void id_list_stop(struct seq_file
*m
, void *p
)
1675 mutex_unlock(&sessions_mutex
);
1679 int id_list_show(struct seq_file
*m
, void *p
)
1681 struct lttng_id_tracker
*id_tracker
= m
->private;
1682 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1685 if (p
== id_tracker_p
) {
1686 /* Tracker disabled. */
1689 const struct lttng_id_hash_node
*e
= p
;
1691 id
= lttng_id_tracker_get_node_id(e
);
1693 switch (id_tracker
->tracker_type
) {
1695 seq_printf(m
, "process { pid = %d; };\n", id
);
1698 seq_printf(m
, "process { vpid = %d; };\n", id
);
1701 seq_printf(m
, "user { uid = %d; };\n", id
);
1704 seq_printf(m
, "user { vuid = %d; };\n", id
);
1707 seq_printf(m
, "group { gid = %d; };\n", id
);
1710 seq_printf(m
, "group { vgid = %d; };\n", id
);
1713 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1719 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1720 .start
= id_list_start
,
1721 .next
= id_list_next
,
1722 .stop
= id_list_stop
,
1723 .show
= id_list_show
,
1727 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1729 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1733 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1735 struct seq_file
*m
= file
->private_data
;
1736 struct lttng_id_tracker
*id_tracker
= m
->private;
1739 WARN_ON_ONCE(!id_tracker
);
1740 ret
= seq_release(inode
, file
);
1742 fput(id_tracker
->session
->file
);
1746 const struct file_operations lttng_tracker_ids_list_fops
= {
1747 .owner
= THIS_MODULE
,
1748 .open
= lttng_tracker_ids_list_open
,
1750 .llseek
= seq_lseek
,
1751 .release
= lttng_tracker_ids_list_release
,
1754 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1755 enum tracker_type tracker_type
)
1757 struct file
*tracker_ids_list_file
;
1761 file_fd
= lttng_get_unused_fd();
1767 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1768 <tng_tracker_ids_list_fops
,
1770 if (IS_ERR(tracker_ids_list_file
)) {
1771 ret
= PTR_ERR(tracker_ids_list_file
);
1774 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1776 goto refcount_error
;
1778 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1781 m
= tracker_ids_list_file
->private_data
;
1783 m
->private = get_tracker(session
, tracker_type
);
1784 BUG_ON(!m
->private);
1785 fd_install(file_fd
, tracker_ids_list_file
);
1790 atomic_long_dec(&session
->file
->f_count
);
1792 fput(tracker_ids_list_file
);
1794 put_unused_fd(file_fd
);
1800 * Enabler management.
1803 int lttng_match_enabler_star_glob(const char *desc_name
,
1804 const char *pattern
)
1806 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1807 desc_name
, LTTNG_SIZE_MAX
))
1813 int lttng_match_enabler_name(const char *desc_name
,
1816 if (strcmp(desc_name
, name
))
1821 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1822 struct lttng_enabler
*enabler
)
1824 const char *desc_name
, *enabler_name
;
1825 bool compat
= false, entry
= false;
1827 enabler_name
= enabler
->event_param
.name
;
1828 switch (enabler
->event_param
.instrumentation
) {
1829 case LTTNG_KERNEL_TRACEPOINT
:
1830 desc_name
= desc
->name
;
1831 switch (enabler
->format_type
) {
1832 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1833 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1834 case LTTNG_ENABLER_FORMAT_NAME
:
1835 return lttng_match_enabler_name(desc_name
, enabler_name
);
1840 case LTTNG_KERNEL_SYSCALL
:
1841 desc_name
= desc
->name
;
1842 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1843 desc_name
+= strlen("compat_");
1846 if (!strncmp(desc_name
, "syscall_exit_",
1847 strlen("syscall_exit_"))) {
1848 desc_name
+= strlen("syscall_exit_");
1849 } else if (!strncmp(desc_name
, "syscall_entry_",
1850 strlen("syscall_entry_"))) {
1851 desc_name
+= strlen("syscall_entry_");
1857 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1858 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1860 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1864 case LTTNG_KERNEL_SYSCALL_EXIT
:
1871 switch (enabler
->event_param
.u
.syscall
.abi
) {
1872 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1874 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1878 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1885 switch (enabler
->event_param
.u
.syscall
.match
) {
1886 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
1887 switch (enabler
->format_type
) {
1888 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1889 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1890 case LTTNG_ENABLER_FORMAT_NAME
:
1891 return lttng_match_enabler_name(desc_name
, enabler_name
);
1896 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
1897 return -EINVAL
; /* Not implemented. */
1909 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1910 struct lttng_event
*event
)
1912 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1915 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1917 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1918 && event
->chan
== event_enabler
->chan
)
1925 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1926 struct lttng_event_notifier
*event_notifier
)
1928 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1929 event_notifier_enabler
);
1931 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
1933 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
1934 && event_notifier
->group
== event_notifier_enabler
->group
1935 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1942 struct lttng_enabler_ref
*lttng_enabler_ref(
1943 struct list_head
*enablers_ref_list
,
1944 struct lttng_enabler
*enabler
)
1946 struct lttng_enabler_ref
*enabler_ref
;
1948 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
1949 if (enabler_ref
->ref
== enabler
)
1956 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1958 struct lttng_session
*session
= event_enabler
->chan
->session
;
1959 struct lttng_probe_desc
*probe_desc
;
1960 const struct lttng_event_desc
*desc
;
1962 struct list_head
*probe_list
;
1964 probe_list
= lttng_get_probe_list_head();
1966 * For each probe event, if we find that a probe event matches
1967 * our enabler, create an associated lttng_event if not
1970 list_for_each_entry(probe_desc
, probe_list
, head
) {
1971 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1973 struct hlist_head
*head
;
1974 struct lttng_event
*event
;
1976 desc
= probe_desc
->event_desc
[i
];
1977 if (!lttng_desc_match_enabler(desc
,
1978 lttng_event_enabler_as_enabler(event_enabler
)))
1982 * Check if already created.
1984 head
= utils_borrow_hash_table_bucket(
1985 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
1987 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1988 if (event
->desc
== desc
1989 && event
->chan
== event_enabler
->chan
)
1996 * We need to create an event for this
1999 event
= _lttng_event_create(event_enabler
->chan
,
2001 LTTNG_KERNEL_TRACEPOINT
);
2003 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2004 probe_desc
->event_desc
[i
]->name
);
2011 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2013 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2014 struct lttng_probe_desc
*probe_desc
;
2015 const struct lttng_event_desc
*desc
;
2017 struct list_head
*probe_list
;
2019 probe_list
= lttng_get_probe_list_head();
2021 * For each probe event, if we find that a probe event matches
2022 * our enabler, create an associated lttng_event_notifier if not
2025 list_for_each_entry(probe_desc
, probe_list
, head
) {
2026 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2028 struct hlist_head
*head
;
2029 struct lttng_event_notifier
*event_notifier
;
2031 desc
= probe_desc
->event_desc
[i
];
2032 if (!lttng_desc_match_enabler(desc
,
2033 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2037 * Check if already created.
2039 head
= utils_borrow_hash_table_bucket(
2040 event_notifier_group
->event_notifiers_ht
.table
,
2041 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
2042 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2043 if (event_notifier
->desc
== desc
2044 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2051 * We need to create a event_notifier for this event probe.
2053 event_notifier
= _lttng_event_notifier_create(desc
,
2054 event_notifier_enabler
->base
.user_token
,
2055 event_notifier_enabler
->error_counter_index
,
2056 event_notifier_group
, NULL
, NULL
,
2057 LTTNG_KERNEL_TRACEPOINT
);
2058 if (IS_ERR(event_notifier
)) {
2059 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2060 probe_desc
->event_desc
[i
]->name
);
2067 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2071 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2076 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2080 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2082 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2087 * Create struct lttng_event if it is missing and present in the list of
2088 * tracepoint probes.
2089 * Should be called with sessions mutex held.
2092 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2094 switch (event_enabler
->base
.event_param
.instrumentation
) {
2095 case LTTNG_KERNEL_TRACEPOINT
:
2096 lttng_create_tracepoint_event_if_missing(event_enabler
);
2098 case LTTNG_KERNEL_SYSCALL
:
2099 lttng_create_syscall_event_if_missing(event_enabler
);
2108 * Create events associated with an event_enabler (if not already present),
2109 * and add backward reference from the event to the enabler.
2110 * Should be called with sessions mutex held.
2113 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2115 struct lttng_channel
*chan
= event_enabler
->chan
;
2116 struct lttng_session
*session
= event_enabler
->chan
->session
;
2117 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2118 struct lttng_event
*event
;
2120 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2121 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2122 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2123 !strcmp(base_enabler
->event_param
.name
, "*")) {
2124 int enabled
= base_enabler
->enabled
;
2125 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2127 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2128 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2130 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2131 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2134 /* First ensure that probe events are created for this enabler. */
2135 lttng_create_event_if_missing(event_enabler
);
2137 /* For each event matching event_enabler in session event list. */
2138 list_for_each_entry(event
, &session
->events
, list
) {
2139 struct lttng_enabler_ref
*enabler_ref
;
2141 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2143 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2144 lttng_event_enabler_as_enabler(event_enabler
));
2147 * If no backward ref, create it.
2148 * Add backward ref from event to event_enabler.
2150 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2153 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2154 list_add(&enabler_ref
->node
,
2155 &event
->enablers_ref_head
);
2159 * Link filter bytecodes if not linked yet.
2161 lttng_enabler_link_bytecode(event
->desc
,
2163 &event
->filter_bytecode_runtime_head
,
2164 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2166 /* TODO: merge event context. */
2172 * Create struct lttng_event_notifier if it is missing and present in the list of
2173 * tracepoint probes.
2174 * Should be called with sessions mutex held.
2177 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2179 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2180 case LTTNG_KERNEL_TRACEPOINT
:
2181 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2183 case LTTNG_KERNEL_SYSCALL
:
2184 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2193 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2196 int lttng_event_notifier_enabler_ref_event_notifiers(
2197 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2199 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2200 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2201 struct lttng_event_notifier
*event_notifier
;
2203 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2204 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2205 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2206 !strcmp(base_enabler
->event_param
.name
, "*")) {
2208 int enabled
= base_enabler
->enabled
;
2209 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2211 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2212 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2214 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2215 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2219 /* First ensure that probe event_notifiers are created for this enabler. */
2220 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2222 /* Link the created event_notifier with its associated enabler. */
2223 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2224 struct lttng_enabler_ref
*enabler_ref
;
2226 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2229 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2230 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2233 * If no backward ref, create it.
2234 * Add backward ref from event_notifier to enabler.
2236 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2240 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2241 event_notifier_enabler
);
2242 list_add(&enabler_ref
->node
,
2243 &event_notifier
->enablers_ref_head
);
2247 * Link filter bytecodes if not linked yet.
2249 lttng_enabler_link_bytecode(event_notifier
->desc
,
2250 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2251 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2253 /* Link capture bytecodes if not linked yet. */
2254 lttng_enabler_link_bytecode(event_notifier
->desc
,
2255 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2256 &event_notifier_enabler
->capture_bytecode_head
);
2258 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2264 * Called at module load: connect the probe on all enablers matching
2266 * Called with sessions lock held.
2268 int lttng_fix_pending_events(void)
2270 struct lttng_session
*session
;
2272 list_for_each_entry(session
, &sessions
, list
)
2273 lttng_session_lazy_sync_event_enablers(session
);
2277 static bool lttng_event_notifier_group_has_active_event_notifiers(
2278 struct lttng_event_notifier_group
*event_notifier_group
)
2280 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2282 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2284 if (event_notifier_enabler
->base
.enabled
)
2290 bool lttng_event_notifier_active(void)
2292 struct lttng_event_notifier_group
*event_notifier_group
;
2294 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2295 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2301 int lttng_fix_pending_event_notifiers(void)
2303 struct lttng_event_notifier_group
*event_notifier_group
;
2305 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2306 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2310 struct lttng_event_enabler
*lttng_event_enabler_create(
2311 enum lttng_enabler_format_type format_type
,
2312 struct lttng_kernel_event
*event_param
,
2313 struct lttng_channel
*chan
)
2315 struct lttng_event_enabler
*event_enabler
;
2317 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2320 event_enabler
->base
.format_type
= format_type
;
2321 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2322 memcpy(&event_enabler
->base
.event_param
, event_param
,
2323 sizeof(event_enabler
->base
.event_param
));
2324 event_enabler
->chan
= chan
;
2326 event_enabler
->base
.enabled
= 0;
2327 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2328 mutex_lock(&sessions_mutex
);
2329 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2330 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2331 mutex_unlock(&sessions_mutex
);
2332 return event_enabler
;
2335 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2337 mutex_lock(&sessions_mutex
);
2338 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2339 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2340 mutex_unlock(&sessions_mutex
);
2344 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2346 mutex_lock(&sessions_mutex
);
2347 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2348 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2349 mutex_unlock(&sessions_mutex
);
2354 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2355 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2357 struct lttng_bytecode_node
*bytecode_node
;
2358 uint32_t bytecode_len
;
2361 ret
= get_user(bytecode_len
, &bytecode
->len
);
2364 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2368 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2369 sizeof(*bytecode
) + bytecode_len
);
2373 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2374 bytecode_node
->enabler
= enabler
;
2375 /* Enforce length based on allocated size */
2376 bytecode_node
->bc
.len
= bytecode_len
;
2377 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2382 lttng_kvfree(bytecode_node
);
2386 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2387 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2390 ret
= lttng_enabler_attach_filter_bytecode(
2391 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2395 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2402 int lttng_event_add_callsite(struct lttng_event
*event
,
2403 struct lttng_kernel_event_callsite __user
*callsite
)
2406 switch (event
->instrumentation
) {
2407 case LTTNG_KERNEL_UPROBE
:
2408 return lttng_uprobes_event_add_callsite(event
, callsite
);
2414 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2415 struct lttng_kernel_context
*context_param
)
2421 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2423 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2425 /* Destroy filter bytecode */
2426 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2427 &enabler
->filter_bytecode_head
, node
) {
2428 lttng_kvfree(filter_node
);
2433 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2435 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2437 /* Destroy contexts */
2438 lttng_destroy_context(event_enabler
->ctx
);
2440 list_del(&event_enabler
->node
);
2441 kfree(event_enabler
);
2444 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2445 struct lttng_event_notifier_group
*event_notifier_group
,
2446 enum lttng_enabler_format_type format_type
,
2447 struct lttng_kernel_event_notifier
*event_notifier_param
)
2449 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2451 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2452 if (!event_notifier_enabler
)
2455 event_notifier_enabler
->base
.format_type
= format_type
;
2456 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2457 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2459 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2460 event_notifier_enabler
->num_captures
= 0;
2462 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2463 sizeof(event_notifier_enabler
->base
.event_param
));
2464 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2466 event_notifier_enabler
->base
.enabled
= 0;
2467 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2468 event_notifier_enabler
->group
= event_notifier_group
;
2470 mutex_lock(&sessions_mutex
);
2471 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2472 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2474 mutex_unlock(&sessions_mutex
);
2476 return event_notifier_enabler
;
2479 int lttng_event_notifier_enabler_enable(
2480 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2482 mutex_lock(&sessions_mutex
);
2483 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2484 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2485 mutex_unlock(&sessions_mutex
);
2489 int lttng_event_notifier_enabler_disable(
2490 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2492 mutex_lock(&sessions_mutex
);
2493 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2494 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2495 mutex_unlock(&sessions_mutex
);
2499 int lttng_event_notifier_enabler_attach_filter_bytecode(
2500 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2501 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2505 ret
= lttng_enabler_attach_filter_bytecode(
2506 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2511 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2518 int lttng_event_notifier_enabler_attach_capture_bytecode(
2519 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2520 struct lttng_kernel_capture_bytecode __user
*bytecode
)
2522 struct lttng_bytecode_node
*bytecode_node
;
2523 struct lttng_enabler
*enabler
=
2524 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2525 uint32_t bytecode_len
;
2528 ret
= get_user(bytecode_len
, &bytecode
->len
);
2532 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2537 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2538 sizeof(*bytecode
) + bytecode_len
);
2542 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2543 bytecode_node
->enabler
= enabler
;
2545 /* Enforce length based on allocated size */
2546 bytecode_node
->bc
.len
= bytecode_len
;
2547 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2549 event_notifier_enabler
->num_captures
++;
2551 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2555 lttng_kvfree(bytecode_node
);
2560 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2561 struct lttng_kernel_event_callsite __user
*callsite
)
2564 switch (event_notifier
->instrumentation
) {
2565 case LTTNG_KERNEL_UPROBE
:
2566 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2573 int lttng_event_notifier_enabler_attach_context(
2574 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2575 struct lttng_kernel_context
*context_param
)
2581 void lttng_event_notifier_enabler_destroy(
2582 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2584 if (!event_notifier_enabler
) {
2588 list_del(&event_notifier_enabler
->node
);
2590 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2591 kfree(event_notifier_enabler
);
2595 * lttng_session_sync_event_enablers should be called just before starting a
2597 * Should be called with sessions mutex held.
2600 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2602 struct lttng_event_enabler
*event_enabler
;
2603 struct lttng_event
*event
;
2605 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2606 lttng_event_enabler_ref_events(event_enabler
);
2608 * For each event, if at least one of its enablers is enabled,
2609 * and its channel and session transient states are enabled, we
2610 * enable the event, else we disable it.
2612 list_for_each_entry(event
, &session
->events
, list
) {
2613 struct lttng_enabler_ref
*enabler_ref
;
2614 struct lttng_bytecode_runtime
*runtime
;
2615 int enabled
= 0, has_enablers_without_bytecode
= 0;
2617 switch (event
->instrumentation
) {
2618 case LTTNG_KERNEL_TRACEPOINT
:
2619 case LTTNG_KERNEL_SYSCALL
:
2621 list_for_each_entry(enabler_ref
,
2622 &event
->enablers_ref_head
, node
) {
2623 if (enabler_ref
->ref
->enabled
) {
2630 /* Not handled with lazy sync. */
2634 * Enabled state is based on union of enablers, with
2635 * intesection of session and channel transient enable
2638 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2640 WRITE_ONCE(event
->enabled
, enabled
);
2642 * Sync tracepoint registration with event enabled
2646 register_event(event
);
2648 _lttng_event_unregister(event
);
2651 /* Check if has enablers without bytecode enabled */
2652 list_for_each_entry(enabler_ref
,
2653 &event
->enablers_ref_head
, node
) {
2654 if (enabler_ref
->ref
->enabled
2655 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2656 has_enablers_without_bytecode
= 1;
2660 event
->has_enablers_without_bytecode
=
2661 has_enablers_without_bytecode
;
2663 /* Enable filters */
2664 list_for_each_entry(runtime
,
2665 &event
->filter_bytecode_runtime_head
, node
)
2666 lttng_bytecode_filter_sync_state(runtime
);
2671 * Apply enablers to session events, adding events to session if need
2672 * be. It is required after each modification applied to an active
2673 * session, and right before session "start".
2674 * "lazy" sync means we only sync if required.
2675 * Should be called with sessions mutex held.
2678 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2680 /* We can skip if session is not active */
2681 if (!session
->active
)
2683 lttng_session_sync_event_enablers(session
);
2687 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2689 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2690 struct lttng_event_notifier
*event_notifier
;
2692 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2693 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2696 * For each event_notifier, if at least one of its enablers is enabled,
2697 * we enable the event_notifier, else we disable it.
2699 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2700 struct lttng_enabler_ref
*enabler_ref
;
2701 struct lttng_bytecode_runtime
*runtime
;
2702 int enabled
= 0, has_enablers_without_bytecode
= 0;
2704 switch (event_notifier
->instrumentation
) {
2705 case LTTNG_KERNEL_TRACEPOINT
:
2706 case LTTNG_KERNEL_SYSCALL
:
2707 /* Enable event_notifiers */
2708 list_for_each_entry(enabler_ref
,
2709 &event_notifier
->enablers_ref_head
, node
) {
2710 if (enabler_ref
->ref
->enabled
) {
2717 /* Not handled with sync. */
2721 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2723 * Sync tracepoint registration with event_notifier enabled
2727 if (!event_notifier
->registered
)
2728 register_event_notifier(event_notifier
);
2730 if (event_notifier
->registered
)
2731 _lttng_event_notifier_unregister(event_notifier
);
2734 /* Check if has enablers without bytecode enabled */
2735 list_for_each_entry(enabler_ref
,
2736 &event_notifier
->enablers_ref_head
, node
) {
2737 if (enabler_ref
->ref
->enabled
2738 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2739 has_enablers_without_bytecode
= 1;
2743 event_notifier
->has_enablers_without_bytecode
=
2744 has_enablers_without_bytecode
;
2746 /* Enable filters */
2747 list_for_each_entry(runtime
,
2748 &event_notifier
->filter_bytecode_runtime_head
, node
)
2749 lttng_bytecode_filter_sync_state(runtime
);
2751 /* Enable captures */
2752 list_for_each_entry(runtime
,
2753 &event_notifier
->capture_bytecode_runtime_head
, node
)
2754 lttng_bytecode_capture_sync_state(runtime
);
2759 * Serialize at most one packet worth of metadata into a metadata
2761 * We grab the metadata cache mutex to get exclusive access to our metadata
2762 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2763 * allows us to do racy operations such as looking for remaining space left in
2764 * packet and write, since mutual exclusion protects us from concurrent writes.
2765 * Mutual exclusion on the metadata cache allow us to read the cache content
2766 * without racing against reallocation of the cache by updates.
2767 * Returns the number of bytes written in the channel, 0 if no data
2768 * was written and a negative value on error.
2770 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2771 struct channel
*chan
, bool *coherent
)
2773 struct lib_ring_buffer_ctx ctx
;
2775 size_t len
, reserve_len
;
2778 * Ensure we support mutiple get_next / put sequences followed by
2779 * put_next. The metadata cache lock protects reading the metadata
2780 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2781 * "flush" operations on the buffer invoked by different processes.
2782 * Moreover, since the metadata cache memory can be reallocated, we
2783 * need to have exclusive access against updates even though we only
2786 mutex_lock(&stream
->metadata_cache
->lock
);
2787 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2788 if (stream
->metadata_in
!= stream
->metadata_out
)
2791 /* Metadata regenerated, change the version. */
2792 if (stream
->metadata_cache
->version
!= stream
->version
)
2793 stream
->version
= stream
->metadata_cache
->version
;
2795 len
= stream
->metadata_cache
->metadata_written
-
2796 stream
->metadata_in
;
2799 reserve_len
= min_t(size_t,
2800 stream
->transport
->ops
.packet_avail_size(chan
),
2802 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2805 * If reservation failed, return an error to the caller.
2807 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2809 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2810 stream
->coherent
= false;
2813 stream
->transport
->ops
.event_write(&ctx
,
2814 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2816 stream
->transport
->ops
.event_commit(&ctx
);
2817 stream
->metadata_in
+= reserve_len
;
2818 if (reserve_len
< len
)
2819 stream
->coherent
= false;
2821 stream
->coherent
= true;
2826 *coherent
= stream
->coherent
;
2827 mutex_unlock(&stream
->metadata_cache
->lock
);
2832 void lttng_metadata_begin(struct lttng_session
*session
)
2834 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2835 mutex_lock(&session
->metadata_cache
->lock
);
2839 void lttng_metadata_end(struct lttng_session
*session
)
2841 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2842 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2843 struct lttng_metadata_stream
*stream
;
2845 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2846 wake_up_interruptible(&stream
->read_wait
);
2847 mutex_unlock(&session
->metadata_cache
->lock
);
2852 * Write the metadata to the metadata cache.
2853 * Must be called with sessions_mutex held.
2854 * The metadata cache lock protects us from concurrent read access from
2855 * thread outputting metadata content to ring buffer.
2856 * The content of the printf is printed as a single atomic metadata
2859 int lttng_metadata_printf(struct lttng_session
*session
,
2860 const char *fmt
, ...)
2866 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2869 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2875 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2876 if (session
->metadata_cache
->metadata_written
+ len
>
2877 session
->metadata_cache
->cache_alloc
) {
2878 char *tmp_cache_realloc
;
2879 unsigned int tmp_cache_alloc_size
;
2881 tmp_cache_alloc_size
= max_t(unsigned int,
2882 session
->metadata_cache
->cache_alloc
+ len
,
2883 session
->metadata_cache
->cache_alloc
<< 1);
2884 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2885 if (!tmp_cache_realloc
)
2887 if (session
->metadata_cache
->data
) {
2888 memcpy(tmp_cache_realloc
,
2889 session
->metadata_cache
->data
,
2890 session
->metadata_cache
->cache_alloc
);
2891 vfree(session
->metadata_cache
->data
);
2894 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2895 session
->metadata_cache
->data
= tmp_cache_realloc
;
2897 memcpy(session
->metadata_cache
->data
+
2898 session
->metadata_cache
->metadata_written
,
2900 session
->metadata_cache
->metadata_written
+= len
;
2911 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2915 for (i
= 0; i
< nesting
; i
++) {
2918 ret
= lttng_metadata_printf(session
, " ");
2927 int lttng_field_name_statedump(struct lttng_session
*session
,
2928 const struct lttng_event_field
*field
,
2931 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2935 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2936 const struct lttng_type
*type
,
2941 WARN_ON_ONCE(type
->atype
!= atype_integer
);
2942 ret
= print_tabs(session
, nesting
);
2945 ret
= lttng_metadata_printf(session
,
2946 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2947 type
->u
.integer
.size
,
2948 type
->u
.integer
.alignment
,
2949 type
->u
.integer
.signedness
,
2950 (type
->u
.integer
.encoding
== lttng_encode_none
)
2952 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
2955 type
->u
.integer
.base
,
2956 #if __BYTE_ORDER == __BIG_ENDIAN
2957 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
2959 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
2966 * Must be called with sessions_mutex held.
2969 int _lttng_struct_type_statedump(struct lttng_session
*session
,
2970 const struct lttng_type
*type
,
2974 uint32_t i
, nr_fields
;
2975 unsigned int alignment
;
2977 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
2979 ret
= print_tabs(session
, nesting
);
2982 ret
= lttng_metadata_printf(session
,
2986 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
2987 for (i
= 0; i
< nr_fields
; i
++) {
2988 const struct lttng_event_field
*iter_field
;
2990 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
2991 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2995 ret
= print_tabs(session
, nesting
);
2998 alignment
= type
->u
.struct_nestable
.alignment
;
3000 ret
= lttng_metadata_printf(session
,
3004 ret
= lttng_metadata_printf(session
,
3011 * Must be called with sessions_mutex held.
3014 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3015 const struct lttng_event_field
*field
,
3020 ret
= _lttng_struct_type_statedump(session
,
3021 &field
->type
, nesting
);
3024 return lttng_field_name_statedump(session
, field
, nesting
);
3028 * Must be called with sessions_mutex held.
3031 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3032 const struct lttng_type
*type
,
3036 uint32_t i
, nr_choices
;
3038 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
3040 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3042 if (type
->u
.variant_nestable
.alignment
!= 0)
3044 ret
= print_tabs(session
, nesting
);
3047 ret
= lttng_metadata_printf(session
,
3048 "variant <_%s> {\n",
3049 type
->u
.variant_nestable
.tag_name
);
3052 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
3053 for (i
= 0; i
< nr_choices
; i
++) {
3054 const struct lttng_event_field
*iter_field
;
3056 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
3057 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3061 ret
= print_tabs(session
, nesting
);
3064 ret
= lttng_metadata_printf(session
,
3070 * Must be called with sessions_mutex held.
3073 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3074 const struct lttng_event_field
*field
,
3079 ret
= _lttng_variant_type_statedump(session
,
3080 &field
->type
, nesting
);
3083 return lttng_field_name_statedump(session
, field
, nesting
);
3087 * Must be called with sessions_mutex held.
3090 int _lttng_array_field_statedump(struct lttng_session
*session
,
3091 const struct lttng_event_field
*field
,
3095 const struct lttng_type
*elem_type
;
3097 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
3099 if (field
->type
.u
.array_nestable
.alignment
) {
3100 ret
= print_tabs(session
, nesting
);
3103 ret
= lttng_metadata_printf(session
,
3104 "struct { } align(%u) _%s_padding;\n",
3105 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
3111 * Nested compound types: Only array of structures and variants are
3112 * currently supported.
3114 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
3115 switch (elem_type
->atype
) {
3117 case atype_struct_nestable
:
3118 case atype_variant_nestable
:
3119 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3127 ret
= lttng_metadata_printf(session
,
3130 field
->type
.u
.array_nestable
.length
);
3135 * Must be called with sessions_mutex held.
3138 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3139 const struct lttng_event_field
*field
,
3143 const char *length_name
;
3144 const struct lttng_type
*elem_type
;
3146 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
3148 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
3150 if (field
->type
.u
.sequence_nestable
.alignment
) {
3151 ret
= print_tabs(session
, nesting
);
3154 ret
= lttng_metadata_printf(session
,
3155 "struct { } align(%u) _%s_padding;\n",
3156 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
3163 * Nested compound types: Only array of structures and variants are
3164 * currently supported.
3166 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
3167 switch (elem_type
->atype
) {
3169 case atype_struct_nestable
:
3170 case atype_variant_nestable
:
3171 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3179 ret
= lttng_metadata_printf(session
,
3182 field
->type
.u
.sequence_nestable
.length_name
);
3187 * Must be called with sessions_mutex held.
3190 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3191 const struct lttng_type
*type
,
3194 const struct lttng_enum_desc
*enum_desc
;
3195 const struct lttng_type
*container_type
;
3197 unsigned int i
, nr_entries
;
3199 container_type
= type
->u
.enum_nestable
.container_type
;
3200 if (container_type
->atype
!= atype_integer
) {
3204 enum_desc
= type
->u
.enum_nestable
.desc
;
3205 nr_entries
= enum_desc
->nr_entries
;
3207 ret
= print_tabs(session
, nesting
);
3210 ret
= lttng_metadata_printf(session
, "enum : ");
3213 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
3216 ret
= lttng_metadata_printf(session
, " {\n");
3219 /* Dump all entries */
3220 for (i
= 0; i
< nr_entries
; i
++) {
3221 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
3224 ret
= print_tabs(session
, nesting
+ 1);
3227 ret
= lttng_metadata_printf(session
,
3231 len
= strlen(entry
->string
);
3232 /* Escape the character '"' */
3233 for (j
= 0; j
< len
; j
++) {
3234 char c
= entry
->string
[j
];
3238 ret
= lttng_metadata_printf(session
,
3242 ret
= lttng_metadata_printf(session
,
3246 ret
= lttng_metadata_printf(session
,
3253 ret
= lttng_metadata_printf(session
, "\"");
3257 if (entry
->options
.is_auto
) {
3258 ret
= lttng_metadata_printf(session
, ",\n");
3262 ret
= lttng_metadata_printf(session
,
3266 if (entry
->start
.signedness
)
3267 ret
= lttng_metadata_printf(session
,
3268 "%lld", (long long) entry
->start
.value
);
3270 ret
= lttng_metadata_printf(session
,
3271 "%llu", entry
->start
.value
);
3274 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3276 == entry
->end
.value
) {
3277 ret
= lttng_metadata_printf(session
,
3280 if (entry
->end
.signedness
) {
3281 ret
= lttng_metadata_printf(session
,
3283 (long long) entry
->end
.value
);
3285 ret
= lttng_metadata_printf(session
,
3294 ret
= print_tabs(session
, nesting
);
3297 ret
= lttng_metadata_printf(session
, "}");
3303 * Must be called with sessions_mutex held.
3306 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3307 const struct lttng_event_field
*field
,
3312 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3315 return lttng_field_name_statedump(session
, field
, nesting
);
3319 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3320 const struct lttng_event_field
*field
,
3325 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3328 return lttng_field_name_statedump(session
, field
, nesting
);
3332 int _lttng_string_type_statedump(struct lttng_session
*session
,
3333 const struct lttng_type
*type
,
3338 WARN_ON_ONCE(type
->atype
!= atype_string
);
3339 /* Default encoding is UTF8 */
3340 ret
= print_tabs(session
, nesting
);
3343 ret
= lttng_metadata_printf(session
,
3345 type
->u
.string
.encoding
== lttng_encode_ASCII
?
3346 " { encoding = ASCII; }" : "");
3351 int _lttng_string_field_statedump(struct lttng_session
*session
,
3352 const struct lttng_event_field
*field
,
3357 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
3358 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3361 return lttng_field_name_statedump(session
, field
, nesting
);
3365 * Must be called with sessions_mutex held.
3368 int _lttng_type_statedump(struct lttng_session
*session
,
3369 const struct lttng_type
*type
,
3374 switch (type
->atype
) {
3376 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3378 case atype_enum_nestable
:
3379 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3382 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3384 case atype_struct_nestable
:
3385 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3387 case atype_variant_nestable
:
3388 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3391 /* Nested arrays and sequences are not supported yet. */
3392 case atype_array_nestable
:
3393 case atype_sequence_nestable
:
3402 * Must be called with sessions_mutex held.
3405 int _lttng_field_statedump(struct lttng_session
*session
,
3406 const struct lttng_event_field
*field
,
3411 switch (field
->type
.atype
) {
3413 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3415 case atype_enum_nestable
:
3416 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3419 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3421 case atype_struct_nestable
:
3422 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3424 case atype_array_nestable
:
3425 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3427 case atype_sequence_nestable
:
3428 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3430 case atype_variant_nestable
:
3431 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3442 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3443 struct lttng_ctx
*ctx
)
3450 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3451 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3453 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3461 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3462 struct lttng_event
*event
)
3464 const struct lttng_event_desc
*desc
= event
->desc
;
3468 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3469 const struct lttng_event_field
*field
= &desc
->fields
[i
];
3471 ret
= _lttng_field_statedump(session
, field
, 2);
3479 * Must be called with sessions_mutex held.
3480 * The entire event metadata is printed as a single atomic metadata
3484 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3485 struct lttng_channel
*chan
,
3486 struct lttng_event
*event
)
3490 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3492 if (chan
->channel_type
== METADATA_CHANNEL
)
3495 lttng_metadata_begin(session
);
3497 ret
= lttng_metadata_printf(session
,
3501 " stream_id = %u;\n",
3509 ret
= lttng_metadata_printf(session
,
3510 " context := struct {\n");
3514 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3518 ret
= lttng_metadata_printf(session
,
3524 ret
= lttng_metadata_printf(session
,
3525 " fields := struct {\n"
3530 ret
= _lttng_fields_metadata_statedump(session
, event
);
3535 * LTTng space reservation can only reserve multiples of the
3538 ret
= lttng_metadata_printf(session
,
3544 event
->metadata_dumped
= 1;
3546 lttng_metadata_end(session
);
3552 * Must be called with sessions_mutex held.
3553 * The entire channel metadata is printed as a single atomic metadata
3557 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3558 struct lttng_channel
*chan
)
3562 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3565 if (chan
->channel_type
== METADATA_CHANNEL
)
3568 lttng_metadata_begin(session
);
3570 WARN_ON_ONCE(!chan
->header_type
);
3571 ret
= lttng_metadata_printf(session
,
3574 " event.header := %s;\n"
3575 " packet.context := struct packet_context;\n",
3577 chan
->header_type
== 1 ? "struct event_header_compact" :
3578 "struct event_header_large");
3583 ret
= lttng_metadata_printf(session
,
3584 " event.context := struct {\n");
3588 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3592 ret
= lttng_metadata_printf(session
,
3598 ret
= lttng_metadata_printf(session
,
3601 chan
->metadata_dumped
= 1;
3603 lttng_metadata_end(session
);
3608 * Must be called with sessions_mutex held.
3611 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3613 return lttng_metadata_printf(session
,
3614 "struct packet_context {\n"
3615 " uint64_clock_monotonic_t timestamp_begin;\n"
3616 " uint64_clock_monotonic_t timestamp_end;\n"
3617 " uint64_t content_size;\n"
3618 " uint64_t packet_size;\n"
3619 " uint64_t packet_seq_num;\n"
3620 " unsigned long events_discarded;\n"
3621 " uint32_t cpu_id;\n"
3628 * id: range: 0 - 30.
3629 * id 31 is reserved to indicate an extended header.
3632 * id: range: 0 - 65534.
3633 * id 65535 is reserved to indicate an extended header.
3635 * Must be called with sessions_mutex held.
3638 int _lttng_event_header_declare(struct lttng_session
*session
)
3640 return lttng_metadata_printf(session
,
3641 "struct event_header_compact {\n"
3642 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3645 " uint27_clock_monotonic_t timestamp;\n"
3649 " uint64_clock_monotonic_t timestamp;\n"
3654 "struct event_header_large {\n"
3655 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3658 " uint32_clock_monotonic_t timestamp;\n"
3662 " uint64_clock_monotonic_t timestamp;\n"
3666 lttng_alignof(uint32_t) * CHAR_BIT
,
3667 lttng_alignof(uint16_t) * CHAR_BIT
3672 * Approximation of NTP time of day to clock monotonic correlation,
3673 * taken at start of trace.
3674 * Yes, this is only an approximation. Yes, we can (and will) do better
3675 * in future versions.
3676 * This function may return a negative offset. It may happen if the
3677 * system sets the REALTIME clock to 0 after boot.
3679 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3683 int64_t measure_clock_offset(void)
3685 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3686 uint64_t tcf
= trace_clock_freq();
3688 unsigned long flags
;
3689 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3690 struct timespec64 rts
= { 0, 0 };
3692 struct timespec rts
= { 0, 0 };
3695 /* Disable interrupts to increase correlation precision. */
3696 local_irq_save(flags
);
3697 monotonic
[0] = trace_clock_read64();
3698 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3699 ktime_get_real_ts64(&rts
);
3701 getnstimeofday(&rts
);
3703 monotonic
[1] = trace_clock_read64();
3704 local_irq_restore(flags
);
3706 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3707 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3708 if (tcf
== NSEC_PER_SEC
) {
3709 realtime
+= rts
.tv_nsec
;
3711 uint64_t n
= rts
.tv_nsec
* tcf
;
3713 do_div(n
, NSEC_PER_SEC
);
3716 offset
= (int64_t) realtime
- monotonic_avg
;
3721 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3729 while (cur
!= '\0') {
3732 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3736 ret
= lttng_metadata_printf(session
, "%c", '\\');
3739 /* We still print the current char */
3742 ret
= lttng_metadata_printf(session
, "%c", cur
);
3756 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3757 const char *field_value
)
3761 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3765 ret
= print_escaped_ctf_string(session
, field_value
);
3769 ret
= lttng_metadata_printf(session
, "\";\n");
3776 * Output metadata into this session's metadata buffers.
3777 * Must be called with sessions_mutex held.
3780 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3782 unsigned char *uuid_c
= session
->uuid
.b
;
3783 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3784 const char *product_uuid
;
3785 struct lttng_channel
*chan
;
3786 struct lttng_event
*event
;
3789 if (!LTTNG_READ_ONCE(session
->active
))
3792 lttng_metadata_begin(session
);
3794 if (session
->metadata_dumped
)
3797 snprintf(uuid_s
, sizeof(uuid_s
),
3798 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3799 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3800 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3801 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3802 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3804 ret
= lttng_metadata_printf(session
,
3805 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3806 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3807 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3808 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3809 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3810 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3811 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3817 " byte_order = %s;\n"
3818 " packet.header := struct {\n"
3819 " uint32_t magic;\n"
3820 " uint8_t uuid[16];\n"
3821 " uint32_t stream_id;\n"
3822 " uint64_t stream_instance_id;\n"
3825 lttng_alignof(uint8_t) * CHAR_BIT
,
3826 lttng_alignof(uint16_t) * CHAR_BIT
,
3827 lttng_alignof(uint32_t) * CHAR_BIT
,
3828 lttng_alignof(uint64_t) * CHAR_BIT
,
3829 sizeof(unsigned long) * CHAR_BIT
,
3830 lttng_alignof(unsigned long) * CHAR_BIT
,
3834 #if __BYTE_ORDER == __BIG_ENDIAN
3843 ret
= lttng_metadata_printf(session
,
3845 " hostname = \"%s\";\n"
3846 " domain = \"kernel\";\n"
3847 " sysname = \"%s\";\n"
3848 " kernel_release = \"%s\";\n"
3849 " kernel_version = \"%s\";\n"
3850 " tracer_name = \"lttng-modules\";\n"
3851 " tracer_major = %d;\n"
3852 " tracer_minor = %d;\n"
3853 " tracer_patchlevel = %d;\n"
3854 " trace_buffering_scheme = \"global\";\n",
3855 current
->nsproxy
->uts_ns
->name
.nodename
,
3859 LTTNG_MODULES_MAJOR_VERSION
,
3860 LTTNG_MODULES_MINOR_VERSION
,
3861 LTTNG_MODULES_PATCHLEVEL_VERSION
3866 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3869 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3870 session
->creation_time
);
3874 /* Add the product UUID to the 'env' section */
3875 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3877 ret
= lttng_metadata_printf(session
,
3878 " product_uuid = \"%s\";\n",
3885 /* Close the 'env' section */
3886 ret
= lttng_metadata_printf(session
, "};\n\n");
3890 ret
= lttng_metadata_printf(session
,
3892 " name = \"%s\";\n",
3898 if (!trace_clock_uuid(clock_uuid_s
)) {
3899 ret
= lttng_metadata_printf(session
,
3900 " uuid = \"%s\";\n",
3907 ret
= lttng_metadata_printf(session
,
3908 " description = \"%s\";\n"
3909 " freq = %llu; /* Frequency, in Hz */\n"
3910 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3913 trace_clock_description(),
3914 (unsigned long long) trace_clock_freq(),
3915 (long long) measure_clock_offset()
3920 ret
= lttng_metadata_printf(session
,
3921 "typealias integer {\n"
3922 " size = 27; align = 1; signed = false;\n"
3923 " map = clock.%s.value;\n"
3924 "} := uint27_clock_monotonic_t;\n"
3926 "typealias integer {\n"
3927 " size = 32; align = %u; signed = false;\n"
3928 " map = clock.%s.value;\n"
3929 "} := uint32_clock_monotonic_t;\n"
3931 "typealias integer {\n"
3932 " size = 64; align = %u; signed = false;\n"
3933 " map = clock.%s.value;\n"
3934 "} := uint64_clock_monotonic_t;\n\n",
3936 lttng_alignof(uint32_t) * CHAR_BIT
,
3938 lttng_alignof(uint64_t) * CHAR_BIT
,
3944 ret
= _lttng_stream_packet_context_declare(session
);
3948 ret
= _lttng_event_header_declare(session
);
3953 list_for_each_entry(chan
, &session
->chan
, list
) {
3954 ret
= _lttng_channel_metadata_statedump(session
, chan
);
3959 list_for_each_entry(event
, &session
->events
, list
) {
3960 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
3964 session
->metadata_dumped
= 1;
3966 lttng_metadata_end(session
);
3971 * lttng_transport_register - LTT transport registration
3972 * @transport: transport structure
3974 * Registers a transport which can be used as output to extract the data out of
3975 * LTTng. The module calling this registration function must ensure that no
3976 * trap-inducing code will be executed by the transport functions. E.g.
3977 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3978 * is made visible to the transport function. This registration acts as a
3979 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3980 * after its registration must it synchronize the TLBs.
3982 void lttng_transport_register(struct lttng_transport
*transport
)
3985 * Make sure no page fault can be triggered by the module about to be
3986 * registered. We deal with this here so we don't have to call
3987 * vmalloc_sync_mappings() in each module's init.
3989 wrapper_vmalloc_sync_mappings();
3991 mutex_lock(&sessions_mutex
);
3992 list_add_tail(&transport
->node
, <tng_transport_list
);
3993 mutex_unlock(&sessions_mutex
);
3995 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3998 * lttng_transport_unregister - LTT transport unregistration
3999 * @transport: transport structure
4001 void lttng_transport_unregister(struct lttng_transport
*transport
)
4003 mutex_lock(&sessions_mutex
);
4004 list_del(&transport
->node
);
4005 mutex_unlock(&sessions_mutex
);
4007 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4009 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4012 * Make sure no page fault can be triggered by the module about to be
4013 * registered. We deal with this here so we don't have to call
4014 * vmalloc_sync_mappings() in each module's init.
4016 wrapper_vmalloc_sync_mappings();
4018 mutex_lock(&sessions_mutex
);
4019 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4020 mutex_unlock(&sessions_mutex
);
4022 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4024 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4026 mutex_lock(&sessions_mutex
);
4027 list_del(&transport
->node
);
4028 mutex_unlock(&sessions_mutex
);
4030 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4032 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
4034 enum cpuhp_state lttng_hp_prepare
;
4035 enum cpuhp_state lttng_hp_online
;
4037 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4039 struct lttng_cpuhp_node
*lttng_node
;
4041 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4042 switch (lttng_node
->component
) {
4043 case LTTNG_RING_BUFFER_FRONTEND
:
4045 case LTTNG_RING_BUFFER_BACKEND
:
4046 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4047 case LTTNG_RING_BUFFER_ITER
:
4049 case LTTNG_CONTEXT_PERF_COUNTERS
:
4056 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4058 struct lttng_cpuhp_node
*lttng_node
;
4060 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4061 switch (lttng_node
->component
) {
4062 case LTTNG_RING_BUFFER_FRONTEND
:
4063 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4064 case LTTNG_RING_BUFFER_BACKEND
:
4066 case LTTNG_RING_BUFFER_ITER
:
4068 case LTTNG_CONTEXT_PERF_COUNTERS
:
4069 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4075 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4077 struct lttng_cpuhp_node
*lttng_node
;
4079 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4080 switch (lttng_node
->component
) {
4081 case LTTNG_RING_BUFFER_FRONTEND
:
4082 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4083 case LTTNG_RING_BUFFER_BACKEND
:
4085 case LTTNG_RING_BUFFER_ITER
:
4086 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4087 case LTTNG_CONTEXT_PERF_COUNTERS
:
4088 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4094 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4096 struct lttng_cpuhp_node
*lttng_node
;
4098 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4099 switch (lttng_node
->component
) {
4100 case LTTNG_RING_BUFFER_FRONTEND
:
4101 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4102 case LTTNG_RING_BUFFER_BACKEND
:
4104 case LTTNG_RING_BUFFER_ITER
:
4106 case LTTNG_CONTEXT_PERF_COUNTERS
:
4113 static int __init
lttng_init_cpu_hotplug(void)
4117 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4118 lttng_hotplug_prepare
,
4119 lttng_hotplug_dead
);
4123 lttng_hp_prepare
= ret
;
4124 lttng_rb_set_hp_prepare(ret
);
4126 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4127 lttng_hotplug_online
,
4128 lttng_hotplug_offline
);
4130 cpuhp_remove_multi_state(lttng_hp_prepare
);
4131 lttng_hp_prepare
= 0;
4134 lttng_hp_online
= ret
;
4135 lttng_rb_set_hp_online(ret
);
4140 static void __exit
lttng_exit_cpu_hotplug(void)
4142 lttng_rb_set_hp_online(0);
4143 cpuhp_remove_multi_state(lttng_hp_online
);
4144 lttng_rb_set_hp_prepare(0);
4145 cpuhp_remove_multi_state(lttng_hp_prepare
);
4148 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4149 static int lttng_init_cpu_hotplug(void)
4153 static void lttng_exit_cpu_hotplug(void)
4156 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4159 static int __init
lttng_events_init(void)
4163 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4166 ret
= wrapper_get_pfnblock_flags_mask_init();
4169 ret
= wrapper_get_pageblock_flags_mask_init();
4172 ret
= lttng_probes_init();
4175 ret
= lttng_context_init();
4178 ret
= lttng_tracepoint_init();
4181 event_cache
= KMEM_CACHE(lttng_event
, 0);
4184 goto error_kmem_event
;
4186 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4187 if (!event_notifier_cache
) {
4189 goto error_kmem_event_notifier
;
4191 ret
= lttng_abi_init();
4194 ret
= lttng_logger_init();
4197 ret
= lttng_init_cpu_hotplug();
4200 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4201 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4202 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4203 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4204 LTTNG_MODULES_EXTRAVERSION
,
4206 #ifdef LTTNG_EXTRA_VERSION_GIT
4207 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4211 #ifdef LTTNG_EXTRA_VERSION_NAME
4212 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4219 lttng_logger_exit();
4223 kmem_cache_destroy(event_notifier_cache
);
4224 error_kmem_event_notifier
:
4225 kmem_cache_destroy(event_cache
);
4227 lttng_tracepoint_exit();
4229 lttng_context_exit();
4230 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4231 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4232 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4233 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4234 LTTNG_MODULES_EXTRAVERSION
,
4236 #ifdef LTTNG_EXTRA_VERSION_GIT
4237 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4241 #ifdef LTTNG_EXTRA_VERSION_NAME
4242 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4249 module_init(lttng_events_init
);
4251 static void __exit
lttng_events_exit(void)
4253 struct lttng_session
*session
, *tmpsession
;
4255 lttng_exit_cpu_hotplug();
4256 lttng_logger_exit();
4258 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4259 lttng_session_destroy(session
);
4260 kmem_cache_destroy(event_cache
);
4261 kmem_cache_destroy(event_notifier_cache
);
4262 lttng_tracepoint_exit();
4263 lttng_context_exit();
4264 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4265 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4266 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4267 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4268 LTTNG_MODULES_EXTRAVERSION
,
4270 #ifdef LTTNG_EXTRA_VERSION_GIT
4271 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4275 #ifdef LTTNG_EXTRA_VERSION_NAME
4276 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4282 module_exit(lttng_events_exit
);
4284 #include <generated/patches.h>
4285 #ifdef LTTNG_EXTRA_VERSION_GIT
4286 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4288 #ifdef LTTNG_EXTRA_VERSION_NAME
4289 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4291 MODULE_LICENSE("GPL and additional rights");
4292 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4293 MODULE_DESCRIPTION("LTTng tracer");
4294 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4295 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4296 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4297 LTTNG_MODULES_EXTRAVERSION
);