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
;
415 error_counter
->ops
->counter_destroy(error_counter
->counter
);
416 module_put(error_counter
->transport
->owner
);
417 lttng_kvfree(error_counter
);
418 event_notifier_group
->error_counter
= NULL
;
421 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
422 module_put(event_notifier_group
->transport
->owner
);
423 list_del(&event_notifier_group
->node
);
425 mutex_unlock(&sessions_mutex
);
426 lttng_kvfree(event_notifier_group
);
429 int lttng_session_statedump(struct lttng_session
*session
)
433 mutex_lock(&sessions_mutex
);
434 ret
= lttng_statedump_start(session
);
435 mutex_unlock(&sessions_mutex
);
439 int lttng_session_enable(struct lttng_session
*session
)
442 struct lttng_channel
*chan
;
444 mutex_lock(&sessions_mutex
);
445 if (session
->active
) {
450 /* Set transient enabler state to "enabled" */
453 /* We need to sync enablers with session before activation. */
454 lttng_session_sync_event_enablers(session
);
457 * Snapshot the number of events per channel to know the type of header
460 list_for_each_entry(chan
, &session
->chan
, list
) {
461 if (chan
->header_type
)
462 continue; /* don't change it if session stop/restart */
463 if (chan
->free_event_id
< 31)
464 chan
->header_type
= 1; /* compact */
466 chan
->header_type
= 2; /* large */
469 /* Clear each stream's quiescent state. */
470 list_for_each_entry(chan
, &session
->chan
, list
) {
471 if (chan
->channel_type
!= METADATA_CHANNEL
)
472 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
475 WRITE_ONCE(session
->active
, 1);
476 WRITE_ONCE(session
->been_active
, 1);
477 ret
= _lttng_session_metadata_statedump(session
);
479 WRITE_ONCE(session
->active
, 0);
482 ret
= lttng_statedump_start(session
);
484 WRITE_ONCE(session
->active
, 0);
486 mutex_unlock(&sessions_mutex
);
490 int lttng_session_disable(struct lttng_session
*session
)
493 struct lttng_channel
*chan
;
495 mutex_lock(&sessions_mutex
);
496 if (!session
->active
) {
500 WRITE_ONCE(session
->active
, 0);
502 /* Set transient enabler state to "disabled" */
504 lttng_session_sync_event_enablers(session
);
506 /* Set each stream's quiescent state. */
507 list_for_each_entry(chan
, &session
->chan
, list
) {
508 if (chan
->channel_type
!= METADATA_CHANNEL
)
509 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
512 mutex_unlock(&sessions_mutex
);
516 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
519 struct lttng_channel
*chan
;
520 struct lttng_event
*event
;
521 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
522 struct lttng_metadata_stream
*stream
;
524 mutex_lock(&sessions_mutex
);
525 if (!session
->active
) {
530 mutex_lock(&cache
->lock
);
531 memset(cache
->data
, 0, cache
->cache_alloc
);
532 cache
->metadata_written
= 0;
534 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
535 stream
->metadata_out
= 0;
536 stream
->metadata_in
= 0;
538 mutex_unlock(&cache
->lock
);
540 session
->metadata_dumped
= 0;
541 list_for_each_entry(chan
, &session
->chan
, list
) {
542 chan
->metadata_dumped
= 0;
545 list_for_each_entry(event
, &session
->events
, list
) {
546 event
->metadata_dumped
= 0;
549 ret
= _lttng_session_metadata_statedump(session
);
552 mutex_unlock(&sessions_mutex
);
556 int lttng_channel_enable(struct lttng_channel
*channel
)
560 mutex_lock(&sessions_mutex
);
561 if (channel
->channel_type
== METADATA_CHANNEL
) {
565 if (channel
->enabled
) {
569 /* Set transient enabler state to "enabled" */
571 lttng_session_sync_event_enablers(channel
->session
);
572 /* Set atomically the state to "enabled" */
573 WRITE_ONCE(channel
->enabled
, 1);
575 mutex_unlock(&sessions_mutex
);
579 int lttng_channel_disable(struct lttng_channel
*channel
)
583 mutex_lock(&sessions_mutex
);
584 if (channel
->channel_type
== METADATA_CHANNEL
) {
588 if (!channel
->enabled
) {
592 /* Set atomically the state to "disabled" */
593 WRITE_ONCE(channel
->enabled
, 0);
594 /* Set transient enabler state to "enabled" */
596 lttng_session_sync_event_enablers(channel
->session
);
598 mutex_unlock(&sessions_mutex
);
602 int lttng_event_enable(struct lttng_event
*event
)
606 mutex_lock(&sessions_mutex
);
607 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
611 if (event
->enabled
) {
615 switch (event
->instrumentation
) {
616 case LTTNG_KERNEL_TRACEPOINT
:
617 case LTTNG_KERNEL_SYSCALL
:
620 case LTTNG_KERNEL_KPROBE
:
621 case LTTNG_KERNEL_UPROBE
:
622 case LTTNG_KERNEL_NOOP
:
623 WRITE_ONCE(event
->enabled
, 1);
625 case LTTNG_KERNEL_KRETPROBE
:
626 ret
= lttng_kretprobes_event_enable_state(event
, 1);
628 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
634 mutex_unlock(&sessions_mutex
);
638 int lttng_event_disable(struct lttng_event
*event
)
642 mutex_lock(&sessions_mutex
);
643 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
647 if (!event
->enabled
) {
651 switch (event
->instrumentation
) {
652 case LTTNG_KERNEL_TRACEPOINT
:
653 case LTTNG_KERNEL_SYSCALL
:
656 case LTTNG_KERNEL_KPROBE
:
657 case LTTNG_KERNEL_UPROBE
:
658 case LTTNG_KERNEL_NOOP
:
659 WRITE_ONCE(event
->enabled
, 0);
661 case LTTNG_KERNEL_KRETPROBE
:
662 ret
= lttng_kretprobes_event_enable_state(event
, 0);
664 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
670 mutex_unlock(&sessions_mutex
);
674 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
678 mutex_lock(&sessions_mutex
);
679 if (event_notifier
->enabled
) {
683 switch (event_notifier
->instrumentation
) {
684 case LTTNG_KERNEL_TRACEPOINT
:
685 case LTTNG_KERNEL_SYSCALL
:
688 case LTTNG_KERNEL_KPROBE
:
689 case LTTNG_KERNEL_UPROBE
:
690 WRITE_ONCE(event_notifier
->enabled
, 1);
692 case LTTNG_KERNEL_FUNCTION
:
693 case LTTNG_KERNEL_NOOP
:
694 case LTTNG_KERNEL_KRETPROBE
:
700 mutex_unlock(&sessions_mutex
);
704 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
708 mutex_lock(&sessions_mutex
);
709 if (!event_notifier
->enabled
) {
713 switch (event_notifier
->instrumentation
) {
714 case LTTNG_KERNEL_TRACEPOINT
:
715 case LTTNG_KERNEL_SYSCALL
:
718 case LTTNG_KERNEL_KPROBE
:
719 case LTTNG_KERNEL_UPROBE
:
720 WRITE_ONCE(event_notifier
->enabled
, 0);
722 case LTTNG_KERNEL_FUNCTION
:
723 case LTTNG_KERNEL_NOOP
:
724 case LTTNG_KERNEL_KRETPROBE
:
730 mutex_unlock(&sessions_mutex
);
734 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
735 const char *transport_name
,
737 size_t subbuf_size
, size_t num_subbuf
,
738 unsigned int switch_timer_interval
,
739 unsigned int read_timer_interval
,
740 enum channel_type channel_type
)
742 struct lttng_channel
*chan
;
743 struct lttng_transport
*transport
= NULL
;
745 mutex_lock(&sessions_mutex
);
746 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
747 goto active
; /* Refuse to add channel to active session */
748 transport
= lttng_transport_find(transport_name
);
750 printk(KERN_WARNING
"LTTng: transport %s not found\n",
754 if (!try_module_get(transport
->owner
)) {
755 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
758 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
761 chan
->session
= session
;
762 chan
->id
= session
->free_chan_id
++;
763 chan
->ops
= &transport
->ops
;
765 * Note: the channel creation op already writes into the packet
766 * headers. Therefore the "chan" information used as input
767 * should be already accessible.
769 chan
->chan
= transport
->ops
.channel_create(transport_name
,
770 chan
, buf_addr
, subbuf_size
, num_subbuf
,
771 switch_timer_interval
, read_timer_interval
);
776 chan
->transport
= transport
;
777 chan
->channel_type
= channel_type
;
778 list_add(&chan
->list
, &session
->chan
);
779 mutex_unlock(&sessions_mutex
);
786 module_put(transport
->owner
);
789 mutex_unlock(&sessions_mutex
);
794 * Only used internally at session destruction for per-cpu channels, and
795 * when metadata channel is released.
796 * Needs to be called with sessions mutex held.
799 void _lttng_channel_destroy(struct lttng_channel
*chan
)
801 chan
->ops
->channel_destroy(chan
->chan
);
802 module_put(chan
->transport
->owner
);
803 list_del(&chan
->list
);
804 lttng_destroy_context(chan
->ctx
);
808 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
810 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
812 /* Protect the metadata cache with the sessions_mutex. */
813 mutex_lock(&sessions_mutex
);
814 _lttng_channel_destroy(chan
);
815 mutex_unlock(&sessions_mutex
);
817 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
820 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
822 stream
->finalized
= 1;
823 wake_up_interruptible(&stream
->read_wait
);
828 * Supports event creation while tracing session is active.
829 * Needs to be called with sessions mutex held.
831 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
832 struct lttng_kernel_event
*event_param
,
834 const struct lttng_event_desc
*event_desc
,
835 enum lttng_kernel_instrumentation itype
)
837 struct lttng_session
*session
= chan
->session
;
838 struct lttng_event
*event
;
839 const char *event_name
;
840 struct hlist_head
*head
;
843 if (chan
->free_event_id
== -1U) {
849 case LTTNG_KERNEL_TRACEPOINT
:
850 event_name
= event_desc
->name
;
852 case LTTNG_KERNEL_KPROBE
:
853 case LTTNG_KERNEL_UPROBE
:
854 case LTTNG_KERNEL_KRETPROBE
:
855 case LTTNG_KERNEL_NOOP
:
856 case LTTNG_KERNEL_SYSCALL
:
857 event_name
= event_param
->name
;
859 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
866 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
867 LTTNG_EVENT_HT_SIZE
, event_name
);
868 lttng_hlist_for_each_entry(event
, head
, hlist
) {
869 WARN_ON_ONCE(!event
->desc
);
870 if (!strncmp(event
->desc
->name
, event_name
,
871 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
872 && chan
== event
->chan
) {
878 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
884 event
->filter
= filter
;
885 event
->id
= chan
->free_event_id
++;
886 event
->instrumentation
= itype
;
887 event
->evtype
= LTTNG_TYPE_EVENT
;
888 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
889 INIT_LIST_HEAD(&event
->enablers_ref_head
);
892 case LTTNG_KERNEL_TRACEPOINT
:
893 /* Event will be enabled by enabler sync. */
895 event
->registered
= 0;
896 event
->desc
= lttng_event_desc_get(event_name
);
901 /* Populate lttng_event structure before event registration. */
904 case LTTNG_KERNEL_KPROBE
:
906 * Needs to be explicitly enabled after creation, since
907 * we may want to apply filters.
910 event
->registered
= 1;
912 * Populate lttng_event structure before event
916 ret
= lttng_kprobes_register_event(event_name
,
917 event_param
->u
.kprobe
.symbol_name
,
918 event_param
->u
.kprobe
.offset
,
919 event_param
->u
.kprobe
.addr
,
925 ret
= try_module_get(event
->desc
->owner
);
928 case LTTNG_KERNEL_KRETPROBE
:
930 struct lttng_event
*event_return
;
932 /* kretprobe defines 2 events */
934 * Needs to be explicitly enabled after creation, since
935 * we may want to apply filters.
938 event
->registered
= 1;
940 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
945 event_return
->chan
= chan
;
946 event_return
->filter
= filter
;
947 event_return
->id
= chan
->free_event_id
++;
948 event_return
->enabled
= 0;
949 event_return
->registered
= 1;
950 event_return
->instrumentation
= itype
;
952 * Populate lttng_event structure before kretprobe registration.
955 ret
= lttng_kretprobes_register(event_name
,
956 event_param
->u
.kretprobe
.symbol_name
,
957 event_param
->u
.kretprobe
.offset
,
958 event_param
->u
.kretprobe
.addr
,
959 event
, event_return
);
961 kmem_cache_free(event_cache
, event_return
);
965 /* Take 2 refs on the module: one per event. */
966 ret
= try_module_get(event
->desc
->owner
);
968 ret
= try_module_get(event
->desc
->owner
);
970 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
972 WARN_ON_ONCE(ret
> 0);
974 kmem_cache_free(event_cache
, event_return
);
975 module_put(event
->desc
->owner
);
976 module_put(event
->desc
->owner
);
977 goto statedump_error
;
979 list_add(&event_return
->list
, &chan
->session
->events
);
982 case LTTNG_KERNEL_NOOP
:
983 case LTTNG_KERNEL_SYSCALL
:
985 * Needs to be explicitly enabled after creation, since
986 * we may want to apply filters.
989 event
->registered
= 0;
990 event
->desc
= event_desc
;
991 switch (event_param
->u
.syscall
.entryexit
) {
992 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
995 case LTTNG_KERNEL_SYSCALL_ENTRY
:
996 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
998 case LTTNG_KERNEL_SYSCALL_EXIT
:
999 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1002 switch (event_param
->u
.syscall
.abi
) {
1003 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1005 goto register_error
;
1006 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1007 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1009 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1010 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1015 goto register_error
;
1018 case LTTNG_KERNEL_UPROBE
:
1020 * Needs to be explicitly enabled after creation, since
1021 * we may want to apply filters.
1024 event
->registered
= 1;
1027 * Populate lttng_event structure before event
1032 ret
= lttng_uprobes_register_event(event_param
->name
,
1033 event_param
->u
.uprobe
.fd
,
1036 goto register_error
;
1037 ret
= try_module_get(event
->desc
->owner
);
1040 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1044 goto register_error
;
1046 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
1047 WARN_ON_ONCE(ret
> 0);
1049 goto statedump_error
;
1051 hlist_add_head(&event
->hlist
, head
);
1052 list_add(&event
->list
, &chan
->session
->events
);
1056 /* If a statedump error occurs, events will not be readable. */
1058 kmem_cache_free(event_cache
, event
);
1063 return ERR_PTR(ret
);
1066 struct lttng_event_notifier
*_lttng_event_notifier_create(
1067 const struct lttng_event_desc
*event_desc
,
1068 uint64_t token
, uint64_t error_counter_index
,
1069 struct lttng_event_notifier_group
*event_notifier_group
,
1070 struct lttng_kernel_event_notifier
*event_notifier_param
,
1071 void *filter
, enum lttng_kernel_instrumentation itype
)
1073 struct lttng_event_notifier
*event_notifier
;
1074 const char *event_name
;
1075 struct hlist_head
*head
;
1079 case LTTNG_KERNEL_TRACEPOINT
:
1080 event_name
= event_desc
->name
;
1082 case LTTNG_KERNEL_KPROBE
:
1083 case LTTNG_KERNEL_UPROBE
:
1084 case LTTNG_KERNEL_SYSCALL
:
1085 event_name
= event_notifier_param
->event
.name
;
1087 case LTTNG_KERNEL_KRETPROBE
:
1088 case LTTNG_KERNEL_FUNCTION
:
1089 case LTTNG_KERNEL_NOOP
:
1096 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1097 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1098 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1099 WARN_ON_ONCE(!event_notifier
->desc
);
1100 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1101 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1102 && event_notifier_group
== event_notifier
->group
1103 && token
== event_notifier
->user_token
) {
1109 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1110 if (!event_notifier
) {
1115 event_notifier
->group
= event_notifier_group
;
1116 event_notifier
->user_token
= token
;
1117 event_notifier
->error_counter_index
= error_counter_index
;
1118 event_notifier
->num_captures
= 0;
1119 event_notifier
->filter
= filter
;
1120 event_notifier
->instrumentation
= itype
;
1121 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1122 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1123 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1124 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1125 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1128 case LTTNG_KERNEL_TRACEPOINT
:
1129 /* Event will be enabled by enabler sync. */
1130 event_notifier
->enabled
= 0;
1131 event_notifier
->registered
= 0;
1132 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1133 if (!event_notifier
->desc
) {
1135 goto register_error
;
1137 /* Populate lttng_event_notifier structure before event registration. */
1140 case LTTNG_KERNEL_KPROBE
:
1142 * Needs to be explicitly enabled after creation, since
1143 * we may want to apply filters.
1145 event_notifier
->enabled
= 0;
1146 event_notifier
->registered
= 1;
1148 * Populate lttng_event_notifier structure before event
1152 ret
= lttng_kprobes_register_event_notifier(
1153 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1154 event_notifier_param
->event
.u
.kprobe
.offset
,
1155 event_notifier_param
->event
.u
.kprobe
.addr
,
1159 goto register_error
;
1161 ret
= try_module_get(event_notifier
->desc
->owner
);
1164 case LTTNG_KERNEL_NOOP
:
1165 case LTTNG_KERNEL_SYSCALL
:
1167 * Needs to be explicitly enabled after creation, since
1168 * we may want to apply filters.
1170 event_notifier
->enabled
= 0;
1171 event_notifier
->registered
= 0;
1172 event_notifier
->desc
= event_desc
;
1173 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1174 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1176 goto register_error
;
1177 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1178 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1180 case LTTNG_KERNEL_SYSCALL_EXIT
:
1181 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1184 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1185 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1187 goto register_error
;
1188 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1189 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1191 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1192 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1196 if (!event_notifier
->desc
) {
1198 goto register_error
;
1201 case LTTNG_KERNEL_UPROBE
:
1203 * Needs to be explicitly enabled after creation, since
1204 * we may want to apply filters.
1206 event_notifier
->enabled
= 0;
1207 event_notifier
->registered
= 1;
1210 * Populate lttng_event_notifier structure before
1211 * event_notifier registration.
1215 ret
= lttng_uprobes_register_event_notifier(
1216 event_notifier_param
->event
.name
,
1217 event_notifier_param
->event
.u
.uprobe
.fd
,
1220 goto register_error
;
1221 ret
= try_module_get(event_notifier
->desc
->owner
);
1224 case LTTNG_KERNEL_KRETPROBE
:
1225 case LTTNG_KERNEL_FUNCTION
:
1229 goto register_error
;
1232 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1233 hlist_add_head(&event_notifier
->hlist
, head
);
1236 * Clear the error counter bucket. The sessiond keeps track of which
1237 * bucket is currently in use. We trust it.
1239 if (event_notifier_group
->error_counter
) {
1240 size_t dimension_index
[1];
1243 * Check that the index is within the boundary of the counter.
1245 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1246 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1247 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1249 goto register_error
;
1252 dimension_index
[0] = event_notifier
->error_counter_index
;
1253 ret
= event_notifier_group
->error_counter
->ops
->counter_clear(
1254 event_notifier_group
->error_counter
->counter
,
1257 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1258 event_notifier
->error_counter_index
);
1259 goto register_error
;
1263 return event_notifier
;
1266 kmem_cache_free(event_notifier_cache
, event_notifier
);
1270 return ERR_PTR(ret
);
1273 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1274 const size_t *dim_indexes
, int32_t cpu
,
1275 int64_t *val
, bool *overflow
, bool *underflow
)
1277 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1278 cpu
, val
, overflow
, underflow
);
1281 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1282 const size_t *dim_indexes
, int64_t *val
,
1283 bool *overflow
, bool *underflow
)
1285 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1286 val
, overflow
, underflow
);
1289 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1290 const size_t *dim_indexes
)
1292 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1295 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1296 struct lttng_kernel_event
*event_param
,
1298 const struct lttng_event_desc
*event_desc
,
1299 enum lttng_kernel_instrumentation itype
)
1301 struct lttng_event
*event
;
1303 mutex_lock(&sessions_mutex
);
1304 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1306 mutex_unlock(&sessions_mutex
);
1310 struct lttng_event_notifier
*lttng_event_notifier_create(
1311 const struct lttng_event_desc
*event_desc
,
1312 uint64_t id
, uint64_t error_counter_index
,
1313 struct lttng_event_notifier_group
*event_notifier_group
,
1314 struct lttng_kernel_event_notifier
*event_notifier_param
,
1315 void *filter
, enum lttng_kernel_instrumentation itype
)
1317 struct lttng_event_notifier
*event_notifier
;
1319 mutex_lock(&sessions_mutex
);
1320 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1321 error_counter_index
, event_notifier_group
,
1322 event_notifier_param
, filter
, itype
);
1323 mutex_unlock(&sessions_mutex
);
1324 return event_notifier
;
1327 /* Only used for tracepoints for now. */
1329 void register_event(struct lttng_event
*event
)
1331 const struct lttng_event_desc
*desc
;
1334 if (event
->registered
)
1338 switch (event
->instrumentation
) {
1339 case LTTNG_KERNEL_TRACEPOINT
:
1340 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1341 desc
->probe_callback
,
1344 case LTTNG_KERNEL_SYSCALL
:
1345 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1347 case LTTNG_KERNEL_KPROBE
:
1348 case LTTNG_KERNEL_UPROBE
:
1349 case LTTNG_KERNEL_KRETPROBE
:
1350 case LTTNG_KERNEL_NOOP
:
1353 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1358 event
->registered
= 1;
1362 * Only used internally at session destruction.
1364 int _lttng_event_unregister(struct lttng_event
*event
)
1366 const struct lttng_event_desc
*desc
;
1369 if (!event
->registered
)
1373 switch (event
->instrumentation
) {
1374 case LTTNG_KERNEL_TRACEPOINT
:
1375 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1376 event
->desc
->probe_callback
,
1379 case LTTNG_KERNEL_KPROBE
:
1380 lttng_kprobes_unregister_event(event
);
1383 case LTTNG_KERNEL_KRETPROBE
:
1384 lttng_kretprobes_unregister(event
);
1387 case LTTNG_KERNEL_SYSCALL
:
1388 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1390 case LTTNG_KERNEL_NOOP
:
1393 case LTTNG_KERNEL_UPROBE
:
1394 lttng_uprobes_unregister_event(event
);
1397 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1402 event
->registered
= 0;
1406 /* Only used for tracepoints for now. */
1408 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1410 const struct lttng_event_desc
*desc
;
1413 if (event_notifier
->registered
)
1416 desc
= event_notifier
->desc
;
1417 switch (event_notifier
->instrumentation
) {
1418 case LTTNG_KERNEL_TRACEPOINT
:
1419 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1420 desc
->event_notifier_callback
,
1423 case LTTNG_KERNEL_SYSCALL
:
1424 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1426 case LTTNG_KERNEL_KPROBE
:
1427 case LTTNG_KERNEL_UPROBE
:
1430 case LTTNG_KERNEL_KRETPROBE
:
1431 case LTTNG_KERNEL_FUNCTION
:
1432 case LTTNG_KERNEL_NOOP
:
1437 event_notifier
->registered
= 1;
1441 int _lttng_event_notifier_unregister(
1442 struct lttng_event_notifier
*event_notifier
)
1444 const struct lttng_event_desc
*desc
;
1447 if (!event_notifier
->registered
)
1450 desc
= event_notifier
->desc
;
1451 switch (event_notifier
->instrumentation
) {
1452 case LTTNG_KERNEL_TRACEPOINT
:
1453 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1454 event_notifier
->desc
->event_notifier_callback
,
1457 case LTTNG_KERNEL_KPROBE
:
1458 lttng_kprobes_unregister_event_notifier(event_notifier
);
1461 case LTTNG_KERNEL_UPROBE
:
1462 lttng_uprobes_unregister_event_notifier(event_notifier
);
1465 case LTTNG_KERNEL_SYSCALL
:
1466 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1468 case LTTNG_KERNEL_KRETPROBE
:
1469 case LTTNG_KERNEL_FUNCTION
:
1470 case LTTNG_KERNEL_NOOP
:
1475 event_notifier
->registered
= 0;
1480 * Only used internally at session destruction.
1483 void _lttng_event_destroy(struct lttng_event
*event
)
1485 switch (event
->instrumentation
) {
1486 case LTTNG_KERNEL_TRACEPOINT
:
1487 lttng_event_desc_put(event
->desc
);
1489 case LTTNG_KERNEL_KPROBE
:
1490 module_put(event
->desc
->owner
);
1491 lttng_kprobes_destroy_event_private(event
);
1493 case LTTNG_KERNEL_KRETPROBE
:
1494 module_put(event
->desc
->owner
);
1495 lttng_kretprobes_destroy_private(event
);
1497 case LTTNG_KERNEL_NOOP
:
1498 case LTTNG_KERNEL_SYSCALL
:
1500 case LTTNG_KERNEL_UPROBE
:
1501 module_put(event
->desc
->owner
);
1502 lttng_uprobes_destroy_event_private(event
);
1504 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1508 list_del(&event
->list
);
1509 lttng_destroy_context(event
->ctx
);
1510 kmem_cache_free(event_cache
, event
);
1514 * Only used internally at session destruction.
1517 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1519 switch (event_notifier
->instrumentation
) {
1520 case LTTNG_KERNEL_TRACEPOINT
:
1521 lttng_event_desc_put(event_notifier
->desc
);
1523 case LTTNG_KERNEL_KPROBE
:
1524 module_put(event_notifier
->desc
->owner
);
1525 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1527 case LTTNG_KERNEL_NOOP
:
1528 case LTTNG_KERNEL_SYSCALL
:
1530 case LTTNG_KERNEL_UPROBE
:
1531 module_put(event_notifier
->desc
->owner
);
1532 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1534 case LTTNG_KERNEL_KRETPROBE
:
1535 case LTTNG_KERNEL_FUNCTION
:
1539 list_del(&event_notifier
->list
);
1540 kmem_cache_free(event_notifier_cache
, event_notifier
);
1543 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1544 enum tracker_type tracker_type
)
1546 switch (tracker_type
) {
1548 return &session
->pid_tracker
;
1550 return &session
->vpid_tracker
;
1552 return &session
->uid_tracker
;
1554 return &session
->vuid_tracker
;
1556 return &session
->gid_tracker
;
1558 return &session
->vgid_tracker
;
1565 int lttng_session_track_id(struct lttng_session
*session
,
1566 enum tracker_type tracker_type
, int id
)
1568 struct lttng_id_tracker
*tracker
;
1571 tracker
= get_tracker(session
, tracker_type
);
1576 mutex_lock(&sessions_mutex
);
1578 /* track all ids: destroy tracker. */
1579 lttng_id_tracker_destroy(tracker
, true);
1582 ret
= lttng_id_tracker_add(tracker
, id
);
1584 mutex_unlock(&sessions_mutex
);
1588 int lttng_session_untrack_id(struct lttng_session
*session
,
1589 enum tracker_type tracker_type
, int id
)
1591 struct lttng_id_tracker
*tracker
;
1594 tracker
= get_tracker(session
, tracker_type
);
1599 mutex_lock(&sessions_mutex
);
1601 /* untrack all ids: replace by empty tracker. */
1602 ret
= lttng_id_tracker_empty_set(tracker
);
1604 ret
= lttng_id_tracker_del(tracker
, id
);
1606 mutex_unlock(&sessions_mutex
);
1611 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1613 struct lttng_id_tracker
*id_tracker
= m
->private;
1614 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1615 struct lttng_id_hash_node
*e
;
1618 mutex_lock(&sessions_mutex
);
1620 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1621 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1623 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1629 /* ID tracker disabled. */
1630 if (iter
>= *pos
&& iter
== 0) {
1631 return id_tracker_p
; /* empty tracker */
1639 /* Called with sessions_mutex held. */
1641 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1643 struct lttng_id_tracker
*id_tracker
= m
->private;
1644 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1645 struct lttng_id_hash_node
*e
;
1650 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1651 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1653 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1654 if (iter
++ >= *ppos
)
1659 /* ID tracker disabled. */
1660 if (iter
>= *ppos
&& iter
== 0)
1661 return p
; /* empty tracker */
1670 void id_list_stop(struct seq_file
*m
, void *p
)
1672 mutex_unlock(&sessions_mutex
);
1676 int id_list_show(struct seq_file
*m
, void *p
)
1678 struct lttng_id_tracker
*id_tracker
= m
->private;
1679 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1682 if (p
== id_tracker_p
) {
1683 /* Tracker disabled. */
1686 const struct lttng_id_hash_node
*e
= p
;
1688 id
= lttng_id_tracker_get_node_id(e
);
1690 switch (id_tracker
->tracker_type
) {
1692 seq_printf(m
, "process { pid = %d; };\n", id
);
1695 seq_printf(m
, "process { vpid = %d; };\n", id
);
1698 seq_printf(m
, "user { uid = %d; };\n", id
);
1701 seq_printf(m
, "user { vuid = %d; };\n", id
);
1704 seq_printf(m
, "group { gid = %d; };\n", id
);
1707 seq_printf(m
, "group { vgid = %d; };\n", id
);
1710 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1716 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1717 .start
= id_list_start
,
1718 .next
= id_list_next
,
1719 .stop
= id_list_stop
,
1720 .show
= id_list_show
,
1724 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1726 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1730 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1732 struct seq_file
*m
= file
->private_data
;
1733 struct lttng_id_tracker
*id_tracker
= m
->private;
1736 WARN_ON_ONCE(!id_tracker
);
1737 ret
= seq_release(inode
, file
);
1739 fput(id_tracker
->session
->file
);
1743 const struct file_operations lttng_tracker_ids_list_fops
= {
1744 .owner
= THIS_MODULE
,
1745 .open
= lttng_tracker_ids_list_open
,
1747 .llseek
= seq_lseek
,
1748 .release
= lttng_tracker_ids_list_release
,
1751 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1752 enum tracker_type tracker_type
)
1754 struct file
*tracker_ids_list_file
;
1758 file_fd
= lttng_get_unused_fd();
1764 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1765 <tng_tracker_ids_list_fops
,
1767 if (IS_ERR(tracker_ids_list_file
)) {
1768 ret
= PTR_ERR(tracker_ids_list_file
);
1771 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1773 goto refcount_error
;
1775 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1778 m
= tracker_ids_list_file
->private_data
;
1780 m
->private = get_tracker(session
, tracker_type
);
1781 BUG_ON(!m
->private);
1782 fd_install(file_fd
, tracker_ids_list_file
);
1787 atomic_long_dec(&session
->file
->f_count
);
1789 fput(tracker_ids_list_file
);
1791 put_unused_fd(file_fd
);
1797 * Enabler management.
1800 int lttng_match_enabler_star_glob(const char *desc_name
,
1801 const char *pattern
)
1803 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1804 desc_name
, LTTNG_SIZE_MAX
))
1810 int lttng_match_enabler_name(const char *desc_name
,
1813 if (strcmp(desc_name
, name
))
1818 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1819 struct lttng_enabler
*enabler
)
1821 const char *desc_name
, *enabler_name
;
1822 bool compat
= false, entry
= false;
1824 enabler_name
= enabler
->event_param
.name
;
1825 switch (enabler
->event_param
.instrumentation
) {
1826 case LTTNG_KERNEL_TRACEPOINT
:
1827 desc_name
= desc
->name
;
1828 switch (enabler
->format_type
) {
1829 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1830 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1831 case LTTNG_ENABLER_FORMAT_NAME
:
1832 return lttng_match_enabler_name(desc_name
, enabler_name
);
1837 case LTTNG_KERNEL_SYSCALL
:
1838 desc_name
= desc
->name
;
1839 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1840 desc_name
+= strlen("compat_");
1843 if (!strncmp(desc_name
, "syscall_exit_",
1844 strlen("syscall_exit_"))) {
1845 desc_name
+= strlen("syscall_exit_");
1846 } else if (!strncmp(desc_name
, "syscall_entry_",
1847 strlen("syscall_entry_"))) {
1848 desc_name
+= strlen("syscall_entry_");
1854 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1855 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1857 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1861 case LTTNG_KERNEL_SYSCALL_EXIT
:
1868 switch (enabler
->event_param
.u
.syscall
.abi
) {
1869 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1871 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1875 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1882 switch (enabler
->event_param
.u
.syscall
.match
) {
1883 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
1884 switch (enabler
->format_type
) {
1885 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1886 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1887 case LTTNG_ENABLER_FORMAT_NAME
:
1888 return lttng_match_enabler_name(desc_name
, enabler_name
);
1893 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
1894 return -EINVAL
; /* Not implemented. */
1906 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1907 struct lttng_event
*event
)
1909 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1912 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1914 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1915 && event
->chan
== event_enabler
->chan
)
1922 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1923 struct lttng_event_notifier
*event_notifier
)
1925 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1926 event_notifier_enabler
);
1928 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
1930 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
1931 && event_notifier
->group
== event_notifier_enabler
->group
1932 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
1939 struct lttng_enabler_ref
*lttng_enabler_ref(
1940 struct list_head
*enablers_ref_list
,
1941 struct lttng_enabler
*enabler
)
1943 struct lttng_enabler_ref
*enabler_ref
;
1945 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
1946 if (enabler_ref
->ref
== enabler
)
1953 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1955 struct lttng_session
*session
= event_enabler
->chan
->session
;
1956 struct lttng_probe_desc
*probe_desc
;
1957 const struct lttng_event_desc
*desc
;
1959 struct list_head
*probe_list
;
1961 probe_list
= lttng_get_probe_list_head();
1963 * For each probe event, if we find that a probe event matches
1964 * our enabler, create an associated lttng_event if not
1967 list_for_each_entry(probe_desc
, probe_list
, head
) {
1968 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1970 struct hlist_head
*head
;
1971 struct lttng_event
*event
;
1973 desc
= probe_desc
->event_desc
[i
];
1974 if (!lttng_desc_match_enabler(desc
,
1975 lttng_event_enabler_as_enabler(event_enabler
)))
1979 * Check if already created.
1981 head
= utils_borrow_hash_table_bucket(
1982 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
1984 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1985 if (event
->desc
== desc
1986 && event
->chan
== event_enabler
->chan
)
1993 * We need to create an event for this
1996 event
= _lttng_event_create(event_enabler
->chan
,
1998 LTTNG_KERNEL_TRACEPOINT
);
2000 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2001 probe_desc
->event_desc
[i
]->name
);
2008 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2010 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2011 struct lttng_probe_desc
*probe_desc
;
2012 const struct lttng_event_desc
*desc
;
2014 struct list_head
*probe_list
;
2016 probe_list
= lttng_get_probe_list_head();
2018 * For each probe event, if we find that a probe event matches
2019 * our enabler, create an associated lttng_event_notifier if not
2022 list_for_each_entry(probe_desc
, probe_list
, head
) {
2023 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2025 struct hlist_head
*head
;
2026 struct lttng_event_notifier
*event_notifier
;
2028 desc
= probe_desc
->event_desc
[i
];
2029 if (!lttng_desc_match_enabler(desc
,
2030 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2034 * Check if already created.
2036 head
= utils_borrow_hash_table_bucket(
2037 event_notifier_group
->event_notifiers_ht
.table
,
2038 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
2039 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2040 if (event_notifier
->desc
== desc
2041 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2048 * We need to create a event_notifier for this event probe.
2050 event_notifier
= _lttng_event_notifier_create(desc
,
2051 event_notifier_enabler
->base
.user_token
,
2052 event_notifier_enabler
->error_counter_index
,
2053 event_notifier_group
, NULL
, NULL
,
2054 LTTNG_KERNEL_TRACEPOINT
);
2055 if (IS_ERR(event_notifier
)) {
2056 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2057 probe_desc
->event_desc
[i
]->name
);
2064 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2068 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2073 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2077 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2079 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2084 * Create struct lttng_event if it is missing and present in the list of
2085 * tracepoint probes.
2086 * Should be called with sessions mutex held.
2089 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2091 switch (event_enabler
->base
.event_param
.instrumentation
) {
2092 case LTTNG_KERNEL_TRACEPOINT
:
2093 lttng_create_tracepoint_event_if_missing(event_enabler
);
2095 case LTTNG_KERNEL_SYSCALL
:
2096 lttng_create_syscall_event_if_missing(event_enabler
);
2105 * Create events associated with an event_enabler (if not already present),
2106 * and add backward reference from the event to the enabler.
2107 * Should be called with sessions mutex held.
2110 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2112 struct lttng_channel
*chan
= event_enabler
->chan
;
2113 struct lttng_session
*session
= event_enabler
->chan
->session
;
2114 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2115 struct lttng_event
*event
;
2117 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2118 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2119 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2120 !strcmp(base_enabler
->event_param
.name
, "*")) {
2121 int enabled
= base_enabler
->enabled
;
2122 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2124 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2125 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2127 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2128 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2131 /* First ensure that probe events are created for this enabler. */
2132 lttng_create_event_if_missing(event_enabler
);
2134 /* For each event matching event_enabler in session event list. */
2135 list_for_each_entry(event
, &session
->events
, list
) {
2136 struct lttng_enabler_ref
*enabler_ref
;
2138 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2140 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2141 lttng_event_enabler_as_enabler(event_enabler
));
2144 * If no backward ref, create it.
2145 * Add backward ref from event to event_enabler.
2147 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2150 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2151 list_add(&enabler_ref
->node
,
2152 &event
->enablers_ref_head
);
2156 * Link filter bytecodes if not linked yet.
2158 lttng_enabler_link_bytecode(event
->desc
,
2160 &event
->filter_bytecode_runtime_head
,
2161 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2163 /* TODO: merge event context. */
2169 * Create struct lttng_event_notifier if it is missing and present in the list of
2170 * tracepoint probes.
2171 * Should be called with sessions mutex held.
2174 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2176 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2177 case LTTNG_KERNEL_TRACEPOINT
:
2178 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2180 case LTTNG_KERNEL_SYSCALL
:
2181 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2190 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2193 int lttng_event_notifier_enabler_ref_event_notifiers(
2194 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2196 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2197 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2198 struct lttng_event_notifier
*event_notifier
;
2200 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2201 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2202 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2203 !strcmp(base_enabler
->event_param
.name
, "*")) {
2205 int enabled
= base_enabler
->enabled
;
2206 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2208 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2209 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2211 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2212 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2216 /* First ensure that probe event_notifiers are created for this enabler. */
2217 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2219 /* Link the created event_notifier with its associated enabler. */
2220 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2221 struct lttng_enabler_ref
*enabler_ref
;
2223 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2226 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2227 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2230 * If no backward ref, create it.
2231 * Add backward ref from event_notifier to enabler.
2233 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2237 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2238 event_notifier_enabler
);
2239 list_add(&enabler_ref
->node
,
2240 &event_notifier
->enablers_ref_head
);
2244 * Link filter bytecodes if not linked yet.
2246 lttng_enabler_link_bytecode(event_notifier
->desc
,
2247 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2248 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2250 /* Link capture bytecodes if not linked yet. */
2251 lttng_enabler_link_bytecode(event_notifier
->desc
,
2252 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2253 &event_notifier_enabler
->capture_bytecode_head
);
2255 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2261 * Called at module load: connect the probe on all enablers matching
2263 * Called with sessions lock held.
2265 int lttng_fix_pending_events(void)
2267 struct lttng_session
*session
;
2269 list_for_each_entry(session
, &sessions
, list
)
2270 lttng_session_lazy_sync_event_enablers(session
);
2274 static bool lttng_event_notifier_group_has_active_event_notifiers(
2275 struct lttng_event_notifier_group
*event_notifier_group
)
2277 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2279 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2281 if (event_notifier_enabler
->base
.enabled
)
2287 bool lttng_event_notifier_active(void)
2289 struct lttng_event_notifier_group
*event_notifier_group
;
2291 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2292 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2298 int lttng_fix_pending_event_notifiers(void)
2300 struct lttng_event_notifier_group
*event_notifier_group
;
2302 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2303 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2307 struct lttng_event_enabler
*lttng_event_enabler_create(
2308 enum lttng_enabler_format_type format_type
,
2309 struct lttng_kernel_event
*event_param
,
2310 struct lttng_channel
*chan
)
2312 struct lttng_event_enabler
*event_enabler
;
2314 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2317 event_enabler
->base
.format_type
= format_type
;
2318 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2319 memcpy(&event_enabler
->base
.event_param
, event_param
,
2320 sizeof(event_enabler
->base
.event_param
));
2321 event_enabler
->chan
= chan
;
2323 event_enabler
->base
.enabled
= 0;
2324 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2325 mutex_lock(&sessions_mutex
);
2326 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2327 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2328 mutex_unlock(&sessions_mutex
);
2329 return event_enabler
;
2332 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2334 mutex_lock(&sessions_mutex
);
2335 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2336 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2337 mutex_unlock(&sessions_mutex
);
2341 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2343 mutex_lock(&sessions_mutex
);
2344 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2345 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2346 mutex_unlock(&sessions_mutex
);
2351 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2352 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2354 struct lttng_bytecode_node
*bytecode_node
;
2355 uint32_t bytecode_len
;
2358 ret
= get_user(bytecode_len
, &bytecode
->len
);
2361 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2365 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2366 sizeof(*bytecode
) + bytecode_len
);
2370 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2371 bytecode_node
->enabler
= enabler
;
2372 /* Enforce length based on allocated size */
2373 bytecode_node
->bc
.len
= bytecode_len
;
2374 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2379 lttng_kvfree(bytecode_node
);
2383 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2384 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2387 ret
= lttng_enabler_attach_filter_bytecode(
2388 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2392 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2399 int lttng_event_add_callsite(struct lttng_event
*event
,
2400 struct lttng_kernel_event_callsite __user
*callsite
)
2403 switch (event
->instrumentation
) {
2404 case LTTNG_KERNEL_UPROBE
:
2405 return lttng_uprobes_event_add_callsite(event
, callsite
);
2411 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2412 struct lttng_kernel_context
*context_param
)
2418 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2420 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2422 /* Destroy filter bytecode */
2423 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2424 &enabler
->filter_bytecode_head
, node
) {
2425 lttng_kvfree(filter_node
);
2430 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2432 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2434 /* Destroy contexts */
2435 lttng_destroy_context(event_enabler
->ctx
);
2437 list_del(&event_enabler
->node
);
2438 kfree(event_enabler
);
2441 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2442 struct lttng_event_notifier_group
*event_notifier_group
,
2443 enum lttng_enabler_format_type format_type
,
2444 struct lttng_kernel_event_notifier
*event_notifier_param
)
2446 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2448 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2449 if (!event_notifier_enabler
)
2452 event_notifier_enabler
->base
.format_type
= format_type
;
2453 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2454 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2456 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2457 event_notifier_enabler
->num_captures
= 0;
2459 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2460 sizeof(event_notifier_enabler
->base
.event_param
));
2461 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2463 event_notifier_enabler
->base
.enabled
= 0;
2464 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2465 event_notifier_enabler
->group
= event_notifier_group
;
2467 mutex_lock(&sessions_mutex
);
2468 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2469 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2471 mutex_unlock(&sessions_mutex
);
2473 return event_notifier_enabler
;
2476 int lttng_event_notifier_enabler_enable(
2477 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2479 mutex_lock(&sessions_mutex
);
2480 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2481 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2482 mutex_unlock(&sessions_mutex
);
2486 int lttng_event_notifier_enabler_disable(
2487 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2489 mutex_lock(&sessions_mutex
);
2490 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2491 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2492 mutex_unlock(&sessions_mutex
);
2496 int lttng_event_notifier_enabler_attach_filter_bytecode(
2497 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2498 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2502 ret
= lttng_enabler_attach_filter_bytecode(
2503 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2508 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2515 int lttng_event_notifier_enabler_attach_capture_bytecode(
2516 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2517 struct lttng_kernel_capture_bytecode __user
*bytecode
)
2519 struct lttng_bytecode_node
*bytecode_node
;
2520 struct lttng_enabler
*enabler
=
2521 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2522 uint32_t bytecode_len
;
2525 ret
= get_user(bytecode_len
, &bytecode
->len
);
2529 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2534 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2535 sizeof(*bytecode
) + bytecode_len
);
2539 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2540 bytecode_node
->enabler
= enabler
;
2542 /* Enforce length based on allocated size */
2543 bytecode_node
->bc
.len
= bytecode_len
;
2544 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2546 event_notifier_enabler
->num_captures
++;
2548 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2552 lttng_kvfree(bytecode_node
);
2557 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2558 struct lttng_kernel_event_callsite __user
*callsite
)
2561 switch (event_notifier
->instrumentation
) {
2562 case LTTNG_KERNEL_UPROBE
:
2563 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2570 int lttng_event_notifier_enabler_attach_context(
2571 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2572 struct lttng_kernel_context
*context_param
)
2578 void lttng_event_notifier_enabler_destroy(
2579 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2581 if (!event_notifier_enabler
) {
2585 list_del(&event_notifier_enabler
->node
);
2587 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2588 kfree(event_notifier_enabler
);
2592 * lttng_session_sync_event_enablers should be called just before starting a
2594 * Should be called with sessions mutex held.
2597 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2599 struct lttng_event_enabler
*event_enabler
;
2600 struct lttng_event
*event
;
2602 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2603 lttng_event_enabler_ref_events(event_enabler
);
2605 * For each event, if at least one of its enablers is enabled,
2606 * and its channel and session transient states are enabled, we
2607 * enable the event, else we disable it.
2609 list_for_each_entry(event
, &session
->events
, list
) {
2610 struct lttng_enabler_ref
*enabler_ref
;
2611 struct lttng_bytecode_runtime
*runtime
;
2612 int enabled
= 0, has_enablers_without_bytecode
= 0;
2614 switch (event
->instrumentation
) {
2615 case LTTNG_KERNEL_TRACEPOINT
:
2616 case LTTNG_KERNEL_SYSCALL
:
2618 list_for_each_entry(enabler_ref
,
2619 &event
->enablers_ref_head
, node
) {
2620 if (enabler_ref
->ref
->enabled
) {
2627 /* Not handled with lazy sync. */
2631 * Enabled state is based on union of enablers, with
2632 * intesection of session and channel transient enable
2635 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2637 WRITE_ONCE(event
->enabled
, enabled
);
2639 * Sync tracepoint registration with event enabled
2643 register_event(event
);
2645 _lttng_event_unregister(event
);
2648 /* Check if has enablers without bytecode enabled */
2649 list_for_each_entry(enabler_ref
,
2650 &event
->enablers_ref_head
, node
) {
2651 if (enabler_ref
->ref
->enabled
2652 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2653 has_enablers_without_bytecode
= 1;
2657 event
->has_enablers_without_bytecode
=
2658 has_enablers_without_bytecode
;
2660 /* Enable filters */
2661 list_for_each_entry(runtime
,
2662 &event
->filter_bytecode_runtime_head
, node
)
2663 lttng_bytecode_filter_sync_state(runtime
);
2668 * Apply enablers to session events, adding events to session if need
2669 * be. It is required after each modification applied to an active
2670 * session, and right before session "start".
2671 * "lazy" sync means we only sync if required.
2672 * Should be called with sessions mutex held.
2675 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2677 /* We can skip if session is not active */
2678 if (!session
->active
)
2680 lttng_session_sync_event_enablers(session
);
2684 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2686 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2687 struct lttng_event_notifier
*event_notifier
;
2689 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2690 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2693 * For each event_notifier, if at least one of its enablers is enabled,
2694 * we enable the event_notifier, else we disable it.
2696 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2697 struct lttng_enabler_ref
*enabler_ref
;
2698 struct lttng_bytecode_runtime
*runtime
;
2699 int enabled
= 0, has_enablers_without_bytecode
= 0;
2701 switch (event_notifier
->instrumentation
) {
2702 case LTTNG_KERNEL_TRACEPOINT
:
2703 case LTTNG_KERNEL_SYSCALL
:
2704 /* Enable event_notifiers */
2705 list_for_each_entry(enabler_ref
,
2706 &event_notifier
->enablers_ref_head
, node
) {
2707 if (enabler_ref
->ref
->enabled
) {
2714 /* Not handled with sync. */
2718 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2720 * Sync tracepoint registration with event_notifier enabled
2724 if (!event_notifier
->registered
)
2725 register_event_notifier(event_notifier
);
2727 if (event_notifier
->registered
)
2728 _lttng_event_notifier_unregister(event_notifier
);
2731 /* Check if has enablers without bytecode enabled */
2732 list_for_each_entry(enabler_ref
,
2733 &event_notifier
->enablers_ref_head
, node
) {
2734 if (enabler_ref
->ref
->enabled
2735 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2736 has_enablers_without_bytecode
= 1;
2740 event_notifier
->has_enablers_without_bytecode
=
2741 has_enablers_without_bytecode
;
2743 /* Enable filters */
2744 list_for_each_entry(runtime
,
2745 &event_notifier
->filter_bytecode_runtime_head
, node
)
2746 lttng_bytecode_filter_sync_state(runtime
);
2748 /* Enable captures */
2749 list_for_each_entry(runtime
,
2750 &event_notifier
->capture_bytecode_runtime_head
, node
)
2751 lttng_bytecode_capture_sync_state(runtime
);
2756 * Serialize at most one packet worth of metadata into a metadata
2758 * We grab the metadata cache mutex to get exclusive access to our metadata
2759 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2760 * allows us to do racy operations such as looking for remaining space left in
2761 * packet and write, since mutual exclusion protects us from concurrent writes.
2762 * Mutual exclusion on the metadata cache allow us to read the cache content
2763 * without racing against reallocation of the cache by updates.
2764 * Returns the number of bytes written in the channel, 0 if no data
2765 * was written and a negative value on error.
2767 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2768 struct channel
*chan
, bool *coherent
)
2770 struct lib_ring_buffer_ctx ctx
;
2772 size_t len
, reserve_len
;
2775 * Ensure we support mutiple get_next / put sequences followed by
2776 * put_next. The metadata cache lock protects reading the metadata
2777 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2778 * "flush" operations on the buffer invoked by different processes.
2779 * Moreover, since the metadata cache memory can be reallocated, we
2780 * need to have exclusive access against updates even though we only
2783 mutex_lock(&stream
->metadata_cache
->lock
);
2784 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2785 if (stream
->metadata_in
!= stream
->metadata_out
)
2788 /* Metadata regenerated, change the version. */
2789 if (stream
->metadata_cache
->version
!= stream
->version
)
2790 stream
->version
= stream
->metadata_cache
->version
;
2792 len
= stream
->metadata_cache
->metadata_written
-
2793 stream
->metadata_in
;
2796 reserve_len
= min_t(size_t,
2797 stream
->transport
->ops
.packet_avail_size(chan
),
2799 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2802 * If reservation failed, return an error to the caller.
2804 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2806 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2807 stream
->coherent
= false;
2810 stream
->transport
->ops
.event_write(&ctx
,
2811 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2813 stream
->transport
->ops
.event_commit(&ctx
);
2814 stream
->metadata_in
+= reserve_len
;
2815 if (reserve_len
< len
)
2816 stream
->coherent
= false;
2818 stream
->coherent
= true;
2823 *coherent
= stream
->coherent
;
2824 mutex_unlock(&stream
->metadata_cache
->lock
);
2829 void lttng_metadata_begin(struct lttng_session
*session
)
2831 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2832 mutex_lock(&session
->metadata_cache
->lock
);
2836 void lttng_metadata_end(struct lttng_session
*session
)
2838 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2839 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2840 struct lttng_metadata_stream
*stream
;
2842 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2843 wake_up_interruptible(&stream
->read_wait
);
2844 mutex_unlock(&session
->metadata_cache
->lock
);
2849 * Write the metadata to the metadata cache.
2850 * Must be called with sessions_mutex held.
2851 * The metadata cache lock protects us from concurrent read access from
2852 * thread outputting metadata content to ring buffer.
2853 * The content of the printf is printed as a single atomic metadata
2856 int lttng_metadata_printf(struct lttng_session
*session
,
2857 const char *fmt
, ...)
2863 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2866 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2872 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2873 if (session
->metadata_cache
->metadata_written
+ len
>
2874 session
->metadata_cache
->cache_alloc
) {
2875 char *tmp_cache_realloc
;
2876 unsigned int tmp_cache_alloc_size
;
2878 tmp_cache_alloc_size
= max_t(unsigned int,
2879 session
->metadata_cache
->cache_alloc
+ len
,
2880 session
->metadata_cache
->cache_alloc
<< 1);
2881 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2882 if (!tmp_cache_realloc
)
2884 if (session
->metadata_cache
->data
) {
2885 memcpy(tmp_cache_realloc
,
2886 session
->metadata_cache
->data
,
2887 session
->metadata_cache
->cache_alloc
);
2888 vfree(session
->metadata_cache
->data
);
2891 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2892 session
->metadata_cache
->data
= tmp_cache_realloc
;
2894 memcpy(session
->metadata_cache
->data
+
2895 session
->metadata_cache
->metadata_written
,
2897 session
->metadata_cache
->metadata_written
+= len
;
2908 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2912 for (i
= 0; i
< nesting
; i
++) {
2915 ret
= lttng_metadata_printf(session
, " ");
2924 int lttng_field_name_statedump(struct lttng_session
*session
,
2925 const struct lttng_event_field
*field
,
2928 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2932 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2933 const struct lttng_type
*type
,
2938 WARN_ON_ONCE(type
->atype
!= atype_integer
);
2939 ret
= print_tabs(session
, nesting
);
2942 ret
= lttng_metadata_printf(session
,
2943 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2944 type
->u
.integer
.size
,
2945 type
->u
.integer
.alignment
,
2946 type
->u
.integer
.signedness
,
2947 (type
->u
.integer
.encoding
== lttng_encode_none
)
2949 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
2952 type
->u
.integer
.base
,
2953 #if __BYTE_ORDER == __BIG_ENDIAN
2954 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
2956 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
2963 * Must be called with sessions_mutex held.
2966 int _lttng_struct_type_statedump(struct lttng_session
*session
,
2967 const struct lttng_type
*type
,
2971 uint32_t i
, nr_fields
;
2972 unsigned int alignment
;
2974 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
2976 ret
= print_tabs(session
, nesting
);
2979 ret
= lttng_metadata_printf(session
,
2983 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
2984 for (i
= 0; i
< nr_fields
; i
++) {
2985 const struct lttng_event_field
*iter_field
;
2987 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
2988 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2992 ret
= print_tabs(session
, nesting
);
2995 alignment
= type
->u
.struct_nestable
.alignment
;
2997 ret
= lttng_metadata_printf(session
,
3001 ret
= lttng_metadata_printf(session
,
3008 * Must be called with sessions_mutex held.
3011 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3012 const struct lttng_event_field
*field
,
3017 ret
= _lttng_struct_type_statedump(session
,
3018 &field
->type
, nesting
);
3021 return lttng_field_name_statedump(session
, field
, nesting
);
3025 * Must be called with sessions_mutex held.
3028 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3029 const struct lttng_type
*type
,
3033 uint32_t i
, nr_choices
;
3035 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
3037 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3039 if (type
->u
.variant_nestable
.alignment
!= 0)
3041 ret
= print_tabs(session
, nesting
);
3044 ret
= lttng_metadata_printf(session
,
3045 "variant <_%s> {\n",
3046 type
->u
.variant_nestable
.tag_name
);
3049 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
3050 for (i
= 0; i
< nr_choices
; i
++) {
3051 const struct lttng_event_field
*iter_field
;
3053 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
3054 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3058 ret
= print_tabs(session
, nesting
);
3061 ret
= lttng_metadata_printf(session
,
3067 * Must be called with sessions_mutex held.
3070 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3071 const struct lttng_event_field
*field
,
3076 ret
= _lttng_variant_type_statedump(session
,
3077 &field
->type
, nesting
);
3080 return lttng_field_name_statedump(session
, field
, nesting
);
3084 * Must be called with sessions_mutex held.
3087 int _lttng_array_field_statedump(struct lttng_session
*session
,
3088 const struct lttng_event_field
*field
,
3092 const struct lttng_type
*elem_type
;
3094 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
3096 if (field
->type
.u
.array_nestable
.alignment
) {
3097 ret
= print_tabs(session
, nesting
);
3100 ret
= lttng_metadata_printf(session
,
3101 "struct { } align(%u) _%s_padding;\n",
3102 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
3108 * Nested compound types: Only array of structures and variants are
3109 * currently supported.
3111 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
3112 switch (elem_type
->atype
) {
3114 case atype_struct_nestable
:
3115 case atype_variant_nestable
:
3116 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3124 ret
= lttng_metadata_printf(session
,
3127 field
->type
.u
.array_nestable
.length
);
3132 * Must be called with sessions_mutex held.
3135 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3136 const struct lttng_event_field
*field
,
3140 const char *length_name
;
3141 const struct lttng_type
*elem_type
;
3143 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
3145 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
3147 if (field
->type
.u
.sequence_nestable
.alignment
) {
3148 ret
= print_tabs(session
, nesting
);
3151 ret
= lttng_metadata_printf(session
,
3152 "struct { } align(%u) _%s_padding;\n",
3153 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
3160 * Nested compound types: Only array of structures and variants are
3161 * currently supported.
3163 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
3164 switch (elem_type
->atype
) {
3166 case atype_struct_nestable
:
3167 case atype_variant_nestable
:
3168 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3176 ret
= lttng_metadata_printf(session
,
3179 field
->type
.u
.sequence_nestable
.length_name
);
3184 * Must be called with sessions_mutex held.
3187 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3188 const struct lttng_type
*type
,
3191 const struct lttng_enum_desc
*enum_desc
;
3192 const struct lttng_type
*container_type
;
3194 unsigned int i
, nr_entries
;
3196 container_type
= type
->u
.enum_nestable
.container_type
;
3197 if (container_type
->atype
!= atype_integer
) {
3201 enum_desc
= type
->u
.enum_nestable
.desc
;
3202 nr_entries
= enum_desc
->nr_entries
;
3204 ret
= print_tabs(session
, nesting
);
3207 ret
= lttng_metadata_printf(session
, "enum : ");
3210 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
3213 ret
= lttng_metadata_printf(session
, " {\n");
3216 /* Dump all entries */
3217 for (i
= 0; i
< nr_entries
; i
++) {
3218 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
3221 ret
= print_tabs(session
, nesting
+ 1);
3224 ret
= lttng_metadata_printf(session
,
3228 len
= strlen(entry
->string
);
3229 /* Escape the character '"' */
3230 for (j
= 0; j
< len
; j
++) {
3231 char c
= entry
->string
[j
];
3235 ret
= lttng_metadata_printf(session
,
3239 ret
= lttng_metadata_printf(session
,
3243 ret
= lttng_metadata_printf(session
,
3250 ret
= lttng_metadata_printf(session
, "\"");
3254 if (entry
->options
.is_auto
) {
3255 ret
= lttng_metadata_printf(session
, ",\n");
3259 ret
= lttng_metadata_printf(session
,
3263 if (entry
->start
.signedness
)
3264 ret
= lttng_metadata_printf(session
,
3265 "%lld", (long long) entry
->start
.value
);
3267 ret
= lttng_metadata_printf(session
,
3268 "%llu", entry
->start
.value
);
3271 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3273 == entry
->end
.value
) {
3274 ret
= lttng_metadata_printf(session
,
3277 if (entry
->end
.signedness
) {
3278 ret
= lttng_metadata_printf(session
,
3280 (long long) entry
->end
.value
);
3282 ret
= lttng_metadata_printf(session
,
3291 ret
= print_tabs(session
, nesting
);
3294 ret
= lttng_metadata_printf(session
, "}");
3300 * Must be called with sessions_mutex held.
3303 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3304 const struct lttng_event_field
*field
,
3309 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3312 return lttng_field_name_statedump(session
, field
, nesting
);
3316 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3317 const struct lttng_event_field
*field
,
3322 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3325 return lttng_field_name_statedump(session
, field
, nesting
);
3329 int _lttng_string_type_statedump(struct lttng_session
*session
,
3330 const struct lttng_type
*type
,
3335 WARN_ON_ONCE(type
->atype
!= atype_string
);
3336 /* Default encoding is UTF8 */
3337 ret
= print_tabs(session
, nesting
);
3340 ret
= lttng_metadata_printf(session
,
3342 type
->u
.string
.encoding
== lttng_encode_ASCII
?
3343 " { encoding = ASCII; }" : "");
3348 int _lttng_string_field_statedump(struct lttng_session
*session
,
3349 const struct lttng_event_field
*field
,
3354 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
3355 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3358 return lttng_field_name_statedump(session
, field
, nesting
);
3362 * Must be called with sessions_mutex held.
3365 int _lttng_type_statedump(struct lttng_session
*session
,
3366 const struct lttng_type
*type
,
3371 switch (type
->atype
) {
3373 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3375 case atype_enum_nestable
:
3376 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3379 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3381 case atype_struct_nestable
:
3382 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3384 case atype_variant_nestable
:
3385 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3388 /* Nested arrays and sequences are not supported yet. */
3389 case atype_array_nestable
:
3390 case atype_sequence_nestable
:
3399 * Must be called with sessions_mutex held.
3402 int _lttng_field_statedump(struct lttng_session
*session
,
3403 const struct lttng_event_field
*field
,
3408 switch (field
->type
.atype
) {
3410 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3412 case atype_enum_nestable
:
3413 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3416 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3418 case atype_struct_nestable
:
3419 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3421 case atype_array_nestable
:
3422 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3424 case atype_sequence_nestable
:
3425 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3427 case atype_variant_nestable
:
3428 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3439 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3440 struct lttng_ctx
*ctx
)
3447 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3448 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3450 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3458 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3459 struct lttng_event
*event
)
3461 const struct lttng_event_desc
*desc
= event
->desc
;
3465 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3466 const struct lttng_event_field
*field
= &desc
->fields
[i
];
3468 ret
= _lttng_field_statedump(session
, field
, 2);
3476 * Must be called with sessions_mutex held.
3477 * The entire event metadata is printed as a single atomic metadata
3481 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3482 struct lttng_channel
*chan
,
3483 struct lttng_event
*event
)
3487 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3489 if (chan
->channel_type
== METADATA_CHANNEL
)
3492 lttng_metadata_begin(session
);
3494 ret
= lttng_metadata_printf(session
,
3498 " stream_id = %u;\n",
3506 ret
= lttng_metadata_printf(session
,
3507 " context := struct {\n");
3511 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3515 ret
= lttng_metadata_printf(session
,
3521 ret
= lttng_metadata_printf(session
,
3522 " fields := struct {\n"
3527 ret
= _lttng_fields_metadata_statedump(session
, event
);
3532 * LTTng space reservation can only reserve multiples of the
3535 ret
= lttng_metadata_printf(session
,
3541 event
->metadata_dumped
= 1;
3543 lttng_metadata_end(session
);
3549 * Must be called with sessions_mutex held.
3550 * The entire channel metadata is printed as a single atomic metadata
3554 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3555 struct lttng_channel
*chan
)
3559 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3562 if (chan
->channel_type
== METADATA_CHANNEL
)
3565 lttng_metadata_begin(session
);
3567 WARN_ON_ONCE(!chan
->header_type
);
3568 ret
= lttng_metadata_printf(session
,
3571 " event.header := %s;\n"
3572 " packet.context := struct packet_context;\n",
3574 chan
->header_type
== 1 ? "struct event_header_compact" :
3575 "struct event_header_large");
3580 ret
= lttng_metadata_printf(session
,
3581 " event.context := struct {\n");
3585 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3589 ret
= lttng_metadata_printf(session
,
3595 ret
= lttng_metadata_printf(session
,
3598 chan
->metadata_dumped
= 1;
3600 lttng_metadata_end(session
);
3605 * Must be called with sessions_mutex held.
3608 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3610 return lttng_metadata_printf(session
,
3611 "struct packet_context {\n"
3612 " uint64_clock_monotonic_t timestamp_begin;\n"
3613 " uint64_clock_monotonic_t timestamp_end;\n"
3614 " uint64_t content_size;\n"
3615 " uint64_t packet_size;\n"
3616 " uint64_t packet_seq_num;\n"
3617 " unsigned long events_discarded;\n"
3618 " uint32_t cpu_id;\n"
3625 * id: range: 0 - 30.
3626 * id 31 is reserved to indicate an extended header.
3629 * id: range: 0 - 65534.
3630 * id 65535 is reserved to indicate an extended header.
3632 * Must be called with sessions_mutex held.
3635 int _lttng_event_header_declare(struct lttng_session
*session
)
3637 return lttng_metadata_printf(session
,
3638 "struct event_header_compact {\n"
3639 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3642 " uint27_clock_monotonic_t timestamp;\n"
3646 " uint64_clock_monotonic_t timestamp;\n"
3651 "struct event_header_large {\n"
3652 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3655 " uint32_clock_monotonic_t timestamp;\n"
3659 " uint64_clock_monotonic_t timestamp;\n"
3663 lttng_alignof(uint32_t) * CHAR_BIT
,
3664 lttng_alignof(uint16_t) * CHAR_BIT
3669 * Approximation of NTP time of day to clock monotonic correlation,
3670 * taken at start of trace.
3671 * Yes, this is only an approximation. Yes, we can (and will) do better
3672 * in future versions.
3673 * This function may return a negative offset. It may happen if the
3674 * system sets the REALTIME clock to 0 after boot.
3676 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3680 int64_t measure_clock_offset(void)
3682 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3683 uint64_t tcf
= trace_clock_freq();
3685 unsigned long flags
;
3686 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3687 struct timespec64 rts
= { 0, 0 };
3689 struct timespec rts
= { 0, 0 };
3692 /* Disable interrupts to increase correlation precision. */
3693 local_irq_save(flags
);
3694 monotonic
[0] = trace_clock_read64();
3695 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3696 ktime_get_real_ts64(&rts
);
3698 getnstimeofday(&rts
);
3700 monotonic
[1] = trace_clock_read64();
3701 local_irq_restore(flags
);
3703 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3704 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3705 if (tcf
== NSEC_PER_SEC
) {
3706 realtime
+= rts
.tv_nsec
;
3708 uint64_t n
= rts
.tv_nsec
* tcf
;
3710 do_div(n
, NSEC_PER_SEC
);
3713 offset
= (int64_t) realtime
- monotonic_avg
;
3718 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3726 while (cur
!= '\0') {
3729 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3733 ret
= lttng_metadata_printf(session
, "%c", '\\');
3736 /* We still print the current char */
3739 ret
= lttng_metadata_printf(session
, "%c", cur
);
3753 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3754 const char *field_value
)
3758 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3762 ret
= print_escaped_ctf_string(session
, field_value
);
3766 ret
= lttng_metadata_printf(session
, "\";\n");
3773 * Output metadata into this session's metadata buffers.
3774 * Must be called with sessions_mutex held.
3777 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3779 unsigned char *uuid_c
= session
->uuid
.b
;
3780 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3781 const char *product_uuid
;
3782 struct lttng_channel
*chan
;
3783 struct lttng_event
*event
;
3786 if (!LTTNG_READ_ONCE(session
->active
))
3789 lttng_metadata_begin(session
);
3791 if (session
->metadata_dumped
)
3794 snprintf(uuid_s
, sizeof(uuid_s
),
3795 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3796 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3797 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3798 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3799 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3801 ret
= lttng_metadata_printf(session
,
3802 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3803 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3804 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3805 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3806 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3807 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3808 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3814 " byte_order = %s;\n"
3815 " packet.header := struct {\n"
3816 " uint32_t magic;\n"
3817 " uint8_t uuid[16];\n"
3818 " uint32_t stream_id;\n"
3819 " uint64_t stream_instance_id;\n"
3822 lttng_alignof(uint8_t) * CHAR_BIT
,
3823 lttng_alignof(uint16_t) * CHAR_BIT
,
3824 lttng_alignof(uint32_t) * CHAR_BIT
,
3825 lttng_alignof(uint64_t) * CHAR_BIT
,
3826 sizeof(unsigned long) * CHAR_BIT
,
3827 lttng_alignof(unsigned long) * CHAR_BIT
,
3831 #if __BYTE_ORDER == __BIG_ENDIAN
3840 ret
= lttng_metadata_printf(session
,
3842 " hostname = \"%s\";\n"
3843 " domain = \"kernel\";\n"
3844 " sysname = \"%s\";\n"
3845 " kernel_release = \"%s\";\n"
3846 " kernel_version = \"%s\";\n"
3847 " tracer_name = \"lttng-modules\";\n"
3848 " tracer_major = %d;\n"
3849 " tracer_minor = %d;\n"
3850 " tracer_patchlevel = %d;\n"
3851 " trace_buffering_scheme = \"global\";\n",
3852 current
->nsproxy
->uts_ns
->name
.nodename
,
3856 LTTNG_MODULES_MAJOR_VERSION
,
3857 LTTNG_MODULES_MINOR_VERSION
,
3858 LTTNG_MODULES_PATCHLEVEL_VERSION
3863 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3866 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3867 session
->creation_time
);
3871 /* Add the product UUID to the 'env' section */
3872 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3874 ret
= lttng_metadata_printf(session
,
3875 " product_uuid = \"%s\";\n",
3882 /* Close the 'env' section */
3883 ret
= lttng_metadata_printf(session
, "};\n\n");
3887 ret
= lttng_metadata_printf(session
,
3889 " name = \"%s\";\n",
3895 if (!trace_clock_uuid(clock_uuid_s
)) {
3896 ret
= lttng_metadata_printf(session
,
3897 " uuid = \"%s\";\n",
3904 ret
= lttng_metadata_printf(session
,
3905 " description = \"%s\";\n"
3906 " freq = %llu; /* Frequency, in Hz */\n"
3907 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3910 trace_clock_description(),
3911 (unsigned long long) trace_clock_freq(),
3912 (long long) measure_clock_offset()
3917 ret
= lttng_metadata_printf(session
,
3918 "typealias integer {\n"
3919 " size = 27; align = 1; signed = false;\n"
3920 " map = clock.%s.value;\n"
3921 "} := uint27_clock_monotonic_t;\n"
3923 "typealias integer {\n"
3924 " size = 32; align = %u; signed = false;\n"
3925 " map = clock.%s.value;\n"
3926 "} := uint32_clock_monotonic_t;\n"
3928 "typealias integer {\n"
3929 " size = 64; align = %u; signed = false;\n"
3930 " map = clock.%s.value;\n"
3931 "} := uint64_clock_monotonic_t;\n\n",
3933 lttng_alignof(uint32_t) * CHAR_BIT
,
3935 lttng_alignof(uint64_t) * CHAR_BIT
,
3941 ret
= _lttng_stream_packet_context_declare(session
);
3945 ret
= _lttng_event_header_declare(session
);
3950 list_for_each_entry(chan
, &session
->chan
, list
) {
3951 ret
= _lttng_channel_metadata_statedump(session
, chan
);
3956 list_for_each_entry(event
, &session
->events
, list
) {
3957 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
3961 session
->metadata_dumped
= 1;
3963 lttng_metadata_end(session
);
3968 * lttng_transport_register - LTT transport registration
3969 * @transport: transport structure
3971 * Registers a transport which can be used as output to extract the data out of
3972 * LTTng. The module calling this registration function must ensure that no
3973 * trap-inducing code will be executed by the transport functions. E.g.
3974 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3975 * is made visible to the transport function. This registration acts as a
3976 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3977 * after its registration must it synchronize the TLBs.
3979 void lttng_transport_register(struct lttng_transport
*transport
)
3982 * Make sure no page fault can be triggered by the module about to be
3983 * registered. We deal with this here so we don't have to call
3984 * vmalloc_sync_mappings() in each module's init.
3986 wrapper_vmalloc_sync_mappings();
3988 mutex_lock(&sessions_mutex
);
3989 list_add_tail(&transport
->node
, <tng_transport_list
);
3990 mutex_unlock(&sessions_mutex
);
3992 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3995 * lttng_transport_unregister - LTT transport unregistration
3996 * @transport: transport structure
3998 void lttng_transport_unregister(struct lttng_transport
*transport
)
4000 mutex_lock(&sessions_mutex
);
4001 list_del(&transport
->node
);
4002 mutex_unlock(&sessions_mutex
);
4004 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4006 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4009 * Make sure no page fault can be triggered by the module about to be
4010 * registered. We deal with this here so we don't have to call
4011 * vmalloc_sync_mappings() in each module's init.
4013 wrapper_vmalloc_sync_mappings();
4015 mutex_lock(&sessions_mutex
);
4016 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4017 mutex_unlock(&sessions_mutex
);
4019 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4021 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4023 mutex_lock(&sessions_mutex
);
4024 list_del(&transport
->node
);
4025 mutex_unlock(&sessions_mutex
);
4027 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4029 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
4031 enum cpuhp_state lttng_hp_prepare
;
4032 enum cpuhp_state lttng_hp_online
;
4034 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4036 struct lttng_cpuhp_node
*lttng_node
;
4038 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4039 switch (lttng_node
->component
) {
4040 case LTTNG_RING_BUFFER_FRONTEND
:
4042 case LTTNG_RING_BUFFER_BACKEND
:
4043 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4044 case LTTNG_RING_BUFFER_ITER
:
4046 case LTTNG_CONTEXT_PERF_COUNTERS
:
4053 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4055 struct lttng_cpuhp_node
*lttng_node
;
4057 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4058 switch (lttng_node
->component
) {
4059 case LTTNG_RING_BUFFER_FRONTEND
:
4060 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4061 case LTTNG_RING_BUFFER_BACKEND
:
4063 case LTTNG_RING_BUFFER_ITER
:
4065 case LTTNG_CONTEXT_PERF_COUNTERS
:
4066 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4072 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4074 struct lttng_cpuhp_node
*lttng_node
;
4076 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4077 switch (lttng_node
->component
) {
4078 case LTTNG_RING_BUFFER_FRONTEND
:
4079 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4080 case LTTNG_RING_BUFFER_BACKEND
:
4082 case LTTNG_RING_BUFFER_ITER
:
4083 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4084 case LTTNG_CONTEXT_PERF_COUNTERS
:
4085 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4091 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4093 struct lttng_cpuhp_node
*lttng_node
;
4095 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4096 switch (lttng_node
->component
) {
4097 case LTTNG_RING_BUFFER_FRONTEND
:
4098 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4099 case LTTNG_RING_BUFFER_BACKEND
:
4101 case LTTNG_RING_BUFFER_ITER
:
4103 case LTTNG_CONTEXT_PERF_COUNTERS
:
4110 static int __init
lttng_init_cpu_hotplug(void)
4114 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4115 lttng_hotplug_prepare
,
4116 lttng_hotplug_dead
);
4120 lttng_hp_prepare
= ret
;
4121 lttng_rb_set_hp_prepare(ret
);
4123 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4124 lttng_hotplug_online
,
4125 lttng_hotplug_offline
);
4127 cpuhp_remove_multi_state(lttng_hp_prepare
);
4128 lttng_hp_prepare
= 0;
4131 lttng_hp_online
= ret
;
4132 lttng_rb_set_hp_online(ret
);
4137 static void __exit
lttng_exit_cpu_hotplug(void)
4139 lttng_rb_set_hp_online(0);
4140 cpuhp_remove_multi_state(lttng_hp_online
);
4141 lttng_rb_set_hp_prepare(0);
4142 cpuhp_remove_multi_state(lttng_hp_prepare
);
4145 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4146 static int lttng_init_cpu_hotplug(void)
4150 static void lttng_exit_cpu_hotplug(void)
4153 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4156 static int __init
lttng_events_init(void)
4160 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4163 ret
= wrapper_get_pfnblock_flags_mask_init();
4166 ret
= wrapper_get_pageblock_flags_mask_init();
4169 ret
= lttng_probes_init();
4172 ret
= lttng_context_init();
4175 ret
= lttng_tracepoint_init();
4178 event_cache
= KMEM_CACHE(lttng_event
, 0);
4181 goto error_kmem_event
;
4183 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4184 if (!event_notifier_cache
) {
4186 goto error_kmem_event_notifier
;
4188 ret
= lttng_abi_init();
4191 ret
= lttng_logger_init();
4194 ret
= lttng_init_cpu_hotplug();
4197 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4198 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4199 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4200 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4201 LTTNG_MODULES_EXTRAVERSION
,
4203 #ifdef LTTNG_EXTRA_VERSION_GIT
4204 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4208 #ifdef LTTNG_EXTRA_VERSION_NAME
4209 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4216 lttng_logger_exit();
4220 kmem_cache_destroy(event_notifier_cache
);
4221 error_kmem_event_notifier
:
4222 kmem_cache_destroy(event_cache
);
4224 lttng_tracepoint_exit();
4226 lttng_context_exit();
4227 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4228 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4229 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4230 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4231 LTTNG_MODULES_EXTRAVERSION
,
4233 #ifdef LTTNG_EXTRA_VERSION_GIT
4234 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4238 #ifdef LTTNG_EXTRA_VERSION_NAME
4239 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4246 module_init(lttng_events_init
);
4248 static void __exit
lttng_events_exit(void)
4250 struct lttng_session
*session
, *tmpsession
;
4252 lttng_exit_cpu_hotplug();
4253 lttng_logger_exit();
4255 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4256 lttng_session_destroy(session
);
4257 kmem_cache_destroy(event_cache
);
4258 kmem_cache_destroy(event_notifier_cache
);
4259 lttng_tracepoint_exit();
4260 lttng_context_exit();
4261 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4262 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4263 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4264 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4265 LTTNG_MODULES_EXTRAVERSION
,
4267 #ifdef LTTNG_EXTRA_VERSION_GIT
4268 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4272 #ifdef LTTNG_EXTRA_VERSION_NAME
4273 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4279 module_exit(lttng_events_exit
);
4281 #include <generated/patches.h>
4282 #ifdef LTTNG_EXTRA_VERSION_GIT
4283 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4285 #ifdef LTTNG_EXTRA_VERSION_NAME
4286 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4288 MODULE_LICENSE("GPL and additional rights");
4289 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4290 MODULE_DESCRIPTION("LTTng tracer");
4291 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4292 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4293 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4294 LTTNG_MODULES_EXTRAVERSION
);