1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/tracer.h>
40 #include <lttng/event-notifier-notification.h>
41 #include <lttng/abi-old.h>
42 #include <lttng/endian.h>
43 #include <lttng/string-utils.h>
44 #include <lttng/utils.h>
45 #include <ringbuffer/backend.h>
46 #include <ringbuffer/frontend.h>
47 #include <wrapper/time.h>
49 #define METADATA_CACHE_DEFAULT_SIZE 4096
51 static LIST_HEAD(sessions
);
52 static LIST_HEAD(event_notifier_groups
);
53 static LIST_HEAD(lttng_transport_list
);
55 * Protect the sessions and metadata caches.
57 static DEFINE_MUTEX(sessions_mutex
);
58 static struct kmem_cache
*event_cache
;
59 static struct kmem_cache
*event_notifier_cache
;
61 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
62 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
63 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
64 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
66 static void _lttng_event_destroy(struct lttng_event
*event
);
67 static void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
);
68 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
69 static int _lttng_event_unregister(struct lttng_event
*event
);
70 static int _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
);
72 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
73 struct lttng_channel
*chan
,
74 struct lttng_event
*event
);
76 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
78 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
80 int _lttng_type_statedump(struct lttng_session
*session
,
81 const struct lttng_type
*type
,
84 int _lttng_field_statedump(struct lttng_session
*session
,
85 const struct lttng_event_field
*field
,
88 void synchronize_trace(void)
90 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
96 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
97 #ifdef CONFIG_PREEMPT_RT_FULL
100 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
101 #ifdef CONFIG_PREEMPT_RT
104 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
107 void lttng_lock_sessions(void)
109 mutex_lock(&sessions_mutex
);
112 void lttng_unlock_sessions(void)
114 mutex_unlock(&sessions_mutex
);
117 static struct lttng_transport
*lttng_transport_find(const char *name
)
119 struct lttng_transport
*transport
;
121 list_for_each_entry(transport
, <tng_transport_list
, node
) {
122 if (!strcmp(transport
->name
, name
))
129 * Called with sessions lock held.
131 int lttng_session_active(void)
133 struct lttng_session
*iter
;
135 list_for_each_entry(iter
, &sessions
, list
) {
142 struct lttng_session
*lttng_session_create(void)
144 struct lttng_session
*session
;
145 struct lttng_metadata_cache
*metadata_cache
;
148 mutex_lock(&sessions_mutex
);
149 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
152 INIT_LIST_HEAD(&session
->chan
);
153 INIT_LIST_HEAD(&session
->events
);
154 lttng_guid_gen(&session
->uuid
);
156 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
159 goto err_free_session
;
160 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
161 if (!metadata_cache
->data
)
163 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
164 kref_init(&metadata_cache
->refcount
);
165 mutex_init(&metadata_cache
->lock
);
166 session
->metadata_cache
= metadata_cache
;
167 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
168 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
169 sizeof(metadata_cache
->uuid
));
170 INIT_LIST_HEAD(&session
->enablers_head
);
171 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
172 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
173 list_add(&session
->list
, &sessions
);
174 session
->pid_tracker
.session
= session
;
175 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
176 session
->vpid_tracker
.session
= session
;
177 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
178 session
->uid_tracker
.session
= session
;
179 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
180 session
->vuid_tracker
.session
= session
;
181 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
182 session
->gid_tracker
.session
= session
;
183 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
184 session
->vgid_tracker
.session
= session
;
185 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
186 mutex_unlock(&sessions_mutex
);
190 kfree(metadata_cache
);
192 lttng_kvfree(session
);
194 mutex_unlock(&sessions_mutex
);
198 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
200 struct lttng_transport
*transport
= NULL
;
201 struct lttng_event_notifier_group
*event_notifier_group
;
202 const char *transport_name
= "relay-event-notifier";
203 size_t subbuf_size
= 4096; //TODO
204 size_t num_subbuf
= 16; //TODO
205 unsigned int switch_timer_interval
= 0;
206 unsigned int read_timer_interval
= 0;
209 mutex_lock(&sessions_mutex
);
211 transport
= lttng_transport_find(transport_name
);
213 printk(KERN_WARNING
"LTTng: transport %s not found\n",
217 if (!try_module_get(transport
->owner
)) {
218 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
223 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
225 if (!event_notifier_group
)
229 * Initialize the ring buffer used to store event notifier
232 event_notifier_group
->ops
= &transport
->ops
;
233 event_notifier_group
->chan
= transport
->ops
.channel_create(
234 transport_name
, event_notifier_group
, NULL
,
235 subbuf_size
, num_subbuf
, switch_timer_interval
,
236 read_timer_interval
);
237 if (!event_notifier_group
->chan
)
240 event_notifier_group
->transport
= transport
;
242 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
243 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
244 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
245 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
247 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
249 mutex_unlock(&sessions_mutex
);
251 return event_notifier_group
;
254 lttng_kvfree(event_notifier_group
);
257 module_put(transport
->owner
);
259 mutex_unlock(&sessions_mutex
);
263 void metadata_cache_destroy(struct kref
*kref
)
265 struct lttng_metadata_cache
*cache
=
266 container_of(kref
, struct lttng_metadata_cache
, refcount
);
271 void lttng_session_destroy(struct lttng_session
*session
)
273 struct lttng_channel
*chan
, *tmpchan
;
274 struct lttng_event
*event
, *tmpevent
;
275 struct lttng_metadata_stream
*metadata_stream
;
276 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
279 mutex_lock(&sessions_mutex
);
280 WRITE_ONCE(session
->active
, 0);
281 list_for_each_entry(chan
, &session
->chan
, list
) {
282 ret
= lttng_syscalls_unregister(chan
);
285 list_for_each_entry(event
, &session
->events
, list
) {
286 ret
= _lttng_event_unregister(event
);
289 synchronize_trace(); /* Wait for in-flight events to complete */
290 list_for_each_entry(chan
, &session
->chan
, list
) {
291 ret
= lttng_syscalls_destroy(chan
);
294 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
295 &session
->enablers_head
, node
)
296 lttng_event_enabler_destroy(event_enabler
);
297 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
298 _lttng_event_destroy(event
);
299 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
300 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
301 _lttng_channel_destroy(chan
);
303 mutex_lock(&session
->metadata_cache
->lock
);
304 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
305 _lttng_metadata_channel_hangup(metadata_stream
);
306 mutex_unlock(&session
->metadata_cache
->lock
);
307 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
308 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
309 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
310 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
311 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
312 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
313 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
314 list_del(&session
->list
);
315 mutex_unlock(&sessions_mutex
);
316 lttng_kvfree(session
);
319 void lttng_event_notifier_group_destroy(
320 struct lttng_event_notifier_group
*event_notifier_group
)
322 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
323 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
326 if (!event_notifier_group
)
329 mutex_lock(&sessions_mutex
);
331 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
332 &event_notifier_group
->event_notifiers_head
, list
) {
333 ret
= _lttng_event_notifier_unregister(event_notifier
);
337 irq_work_sync(&event_notifier_group
->wakeup_pending
);
339 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
340 &event_notifier_group
->enablers_head
, node
)
341 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
343 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
344 &event_notifier_group
->event_notifiers_head
, list
)
345 _lttng_event_notifier_destroy(event_notifier
);
347 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
348 module_put(event_notifier_group
->transport
->owner
);
349 list_del(&event_notifier_group
->node
);
351 mutex_unlock(&sessions_mutex
);
352 lttng_kvfree(event_notifier_group
);
355 int lttng_session_statedump(struct lttng_session
*session
)
359 mutex_lock(&sessions_mutex
);
360 ret
= lttng_statedump_start(session
);
361 mutex_unlock(&sessions_mutex
);
365 int lttng_session_enable(struct lttng_session
*session
)
368 struct lttng_channel
*chan
;
370 mutex_lock(&sessions_mutex
);
371 if (session
->active
) {
376 /* Set transient enabler state to "enabled" */
379 /* We need to sync enablers with session before activation. */
380 lttng_session_sync_event_enablers(session
);
383 * Snapshot the number of events per channel to know the type of header
386 list_for_each_entry(chan
, &session
->chan
, list
) {
387 if (chan
->header_type
)
388 continue; /* don't change it if session stop/restart */
389 if (chan
->free_event_id
< 31)
390 chan
->header_type
= 1; /* compact */
392 chan
->header_type
= 2; /* large */
395 /* Clear each stream's quiescent state. */
396 list_for_each_entry(chan
, &session
->chan
, list
) {
397 if (chan
->channel_type
!= METADATA_CHANNEL
)
398 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
401 WRITE_ONCE(session
->active
, 1);
402 WRITE_ONCE(session
->been_active
, 1);
403 ret
= _lttng_session_metadata_statedump(session
);
405 WRITE_ONCE(session
->active
, 0);
408 ret
= lttng_statedump_start(session
);
410 WRITE_ONCE(session
->active
, 0);
412 mutex_unlock(&sessions_mutex
);
416 int lttng_session_disable(struct lttng_session
*session
)
419 struct lttng_channel
*chan
;
421 mutex_lock(&sessions_mutex
);
422 if (!session
->active
) {
426 WRITE_ONCE(session
->active
, 0);
428 /* Set transient enabler state to "disabled" */
430 lttng_session_sync_event_enablers(session
);
432 /* Set each stream's quiescent state. */
433 list_for_each_entry(chan
, &session
->chan
, list
) {
434 if (chan
->channel_type
!= METADATA_CHANNEL
)
435 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
438 mutex_unlock(&sessions_mutex
);
442 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
445 struct lttng_channel
*chan
;
446 struct lttng_event
*event
;
447 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
448 struct lttng_metadata_stream
*stream
;
450 mutex_lock(&sessions_mutex
);
451 if (!session
->active
) {
456 mutex_lock(&cache
->lock
);
457 memset(cache
->data
, 0, cache
->cache_alloc
);
458 cache
->metadata_written
= 0;
460 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
461 stream
->metadata_out
= 0;
462 stream
->metadata_in
= 0;
464 mutex_unlock(&cache
->lock
);
466 session
->metadata_dumped
= 0;
467 list_for_each_entry(chan
, &session
->chan
, list
) {
468 chan
->metadata_dumped
= 0;
471 list_for_each_entry(event
, &session
->events
, list
) {
472 event
->metadata_dumped
= 0;
475 ret
= _lttng_session_metadata_statedump(session
);
478 mutex_unlock(&sessions_mutex
);
482 int lttng_channel_enable(struct lttng_channel
*channel
)
486 mutex_lock(&sessions_mutex
);
487 if (channel
->channel_type
== METADATA_CHANNEL
) {
491 if (channel
->enabled
) {
495 /* Set transient enabler state to "enabled" */
497 lttng_session_sync_event_enablers(channel
->session
);
498 /* Set atomically the state to "enabled" */
499 WRITE_ONCE(channel
->enabled
, 1);
501 mutex_unlock(&sessions_mutex
);
505 int lttng_channel_disable(struct lttng_channel
*channel
)
509 mutex_lock(&sessions_mutex
);
510 if (channel
->channel_type
== METADATA_CHANNEL
) {
514 if (!channel
->enabled
) {
518 /* Set atomically the state to "disabled" */
519 WRITE_ONCE(channel
->enabled
, 0);
520 /* Set transient enabler state to "enabled" */
522 lttng_session_sync_event_enablers(channel
->session
);
524 mutex_unlock(&sessions_mutex
);
528 int lttng_event_enable(struct lttng_event
*event
)
532 mutex_lock(&sessions_mutex
);
533 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
537 if (event
->enabled
) {
541 switch (event
->instrumentation
) {
542 case LTTNG_KERNEL_TRACEPOINT
:
543 case LTTNG_KERNEL_SYSCALL
:
546 case LTTNG_KERNEL_KPROBE
:
547 case LTTNG_KERNEL_UPROBE
:
548 case LTTNG_KERNEL_NOOP
:
549 WRITE_ONCE(event
->enabled
, 1);
551 case LTTNG_KERNEL_KRETPROBE
:
552 ret
= lttng_kretprobes_event_enable_state(event
, 1);
554 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
560 mutex_unlock(&sessions_mutex
);
564 int lttng_event_disable(struct lttng_event
*event
)
568 mutex_lock(&sessions_mutex
);
569 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
573 if (!event
->enabled
) {
577 switch (event
->instrumentation
) {
578 case LTTNG_KERNEL_TRACEPOINT
:
579 case LTTNG_KERNEL_SYSCALL
:
582 case LTTNG_KERNEL_KPROBE
:
583 case LTTNG_KERNEL_UPROBE
:
584 case LTTNG_KERNEL_NOOP
:
585 WRITE_ONCE(event
->enabled
, 0);
587 case LTTNG_KERNEL_KRETPROBE
:
588 ret
= lttng_kretprobes_event_enable_state(event
, 0);
590 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
596 mutex_unlock(&sessions_mutex
);
600 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
604 mutex_lock(&sessions_mutex
);
605 if (event_notifier
->enabled
) {
609 switch (event_notifier
->instrumentation
) {
610 case LTTNG_KERNEL_TRACEPOINT
:
611 case LTTNG_KERNEL_SYSCALL
:
612 case LTTNG_KERNEL_KPROBE
:
613 case LTTNG_KERNEL_FUNCTION
:
614 case LTTNG_KERNEL_UPROBE
:
615 case LTTNG_KERNEL_NOOP
:
616 case LTTNG_KERNEL_KRETPROBE
:
622 mutex_unlock(&sessions_mutex
);
626 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
630 mutex_lock(&sessions_mutex
);
631 if (!event_notifier
->enabled
) {
635 switch (event_notifier
->instrumentation
) {
636 case LTTNG_KERNEL_TRACEPOINT
:
637 case LTTNG_KERNEL_SYSCALL
:
638 case LTTNG_KERNEL_KPROBE
:
639 case LTTNG_KERNEL_FUNCTION
:
640 case LTTNG_KERNEL_UPROBE
:
641 case LTTNG_KERNEL_NOOP
:
642 case LTTNG_KERNEL_KRETPROBE
:
648 mutex_unlock(&sessions_mutex
);
652 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
653 const char *transport_name
,
655 size_t subbuf_size
, size_t num_subbuf
,
656 unsigned int switch_timer_interval
,
657 unsigned int read_timer_interval
,
658 enum channel_type channel_type
)
660 struct lttng_channel
*chan
;
661 struct lttng_transport
*transport
= NULL
;
663 mutex_lock(&sessions_mutex
);
664 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
665 goto active
; /* Refuse to add channel to active session */
666 transport
= lttng_transport_find(transport_name
);
668 printk(KERN_WARNING
"LTTng: transport %s not found\n",
672 if (!try_module_get(transport
->owner
)) {
673 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
676 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
679 chan
->session
= session
;
680 chan
->id
= session
->free_chan_id
++;
681 chan
->ops
= &transport
->ops
;
683 * Note: the channel creation op already writes into the packet
684 * headers. Therefore the "chan" information used as input
685 * should be already accessible.
687 chan
->chan
= transport
->ops
.channel_create(transport_name
,
688 chan
, buf_addr
, subbuf_size
, num_subbuf
,
689 switch_timer_interval
, read_timer_interval
);
694 chan
->transport
= transport
;
695 chan
->channel_type
= channel_type
;
696 list_add(&chan
->list
, &session
->chan
);
697 mutex_unlock(&sessions_mutex
);
704 module_put(transport
->owner
);
707 mutex_unlock(&sessions_mutex
);
712 * Only used internally at session destruction for per-cpu channels, and
713 * when metadata channel is released.
714 * Needs to be called with sessions mutex held.
717 void _lttng_channel_destroy(struct lttng_channel
*chan
)
719 chan
->ops
->channel_destroy(chan
->chan
);
720 module_put(chan
->transport
->owner
);
721 list_del(&chan
->list
);
722 lttng_destroy_context(chan
->ctx
);
726 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
728 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
730 /* Protect the metadata cache with the sessions_mutex. */
731 mutex_lock(&sessions_mutex
);
732 _lttng_channel_destroy(chan
);
733 mutex_unlock(&sessions_mutex
);
735 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
738 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
740 stream
->finalized
= 1;
741 wake_up_interruptible(&stream
->read_wait
);
745 * Supports event creation while tracing session is active.
746 * Needs to be called with sessions mutex held.
748 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
749 struct lttng_kernel_event
*event_param
,
751 const struct lttng_event_desc
*event_desc
,
752 enum lttng_kernel_instrumentation itype
)
754 struct lttng_session
*session
= chan
->session
;
755 struct lttng_event
*event
;
756 const char *event_name
;
757 struct hlist_head
*head
;
760 if (chan
->free_event_id
== -1U) {
766 case LTTNG_KERNEL_TRACEPOINT
:
767 event_name
= event_desc
->name
;
769 case LTTNG_KERNEL_KPROBE
:
770 case LTTNG_KERNEL_UPROBE
:
771 case LTTNG_KERNEL_KRETPROBE
:
772 case LTTNG_KERNEL_NOOP
:
773 case LTTNG_KERNEL_SYSCALL
:
774 event_name
= event_param
->name
;
776 case LTTNG_KERNEL_FUNCTION
: /* Fall-through. */
783 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
784 LTTNG_EVENT_HT_SIZE
, event_name
);
785 lttng_hlist_for_each_entry(event
, head
, hlist
) {
786 WARN_ON_ONCE(!event
->desc
);
787 if (!strncmp(event
->desc
->name
, event_name
,
788 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
789 && chan
== event
->chan
) {
795 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
801 event
->filter
= filter
;
802 event
->id
= chan
->free_event_id
++;
803 event
->instrumentation
= itype
;
804 event
->evtype
= LTTNG_TYPE_EVENT
;
805 INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
806 INIT_LIST_HEAD(&event
->enablers_ref_head
);
809 case LTTNG_KERNEL_TRACEPOINT
:
810 /* Event will be enabled by enabler sync. */
812 event
->registered
= 0;
813 event
->desc
= lttng_event_desc_get(event_name
);
818 /* Populate lttng_event structure before event registration. */
821 case LTTNG_KERNEL_KPROBE
:
823 * Needs to be explicitly enabled after creation, since
824 * we may want to apply filters.
827 event
->registered
= 1;
829 * Populate lttng_event structure before event
833 ret
= lttng_kprobes_register(event_name
,
834 event_param
->u
.kprobe
.symbol_name
,
835 event_param
->u
.kprobe
.offset
,
836 event_param
->u
.kprobe
.addr
,
842 ret
= try_module_get(event
->desc
->owner
);
845 case LTTNG_KERNEL_KRETPROBE
:
847 struct lttng_event
*event_return
;
849 /* kretprobe defines 2 events */
851 * Needs to be explicitly enabled after creation, since
852 * we may want to apply filters.
855 event
->registered
= 1;
857 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
862 event_return
->chan
= chan
;
863 event_return
->filter
= filter
;
864 event_return
->id
= chan
->free_event_id
++;
865 event_return
->enabled
= 0;
866 event_return
->registered
= 1;
867 event_return
->instrumentation
= itype
;
869 * Populate lttng_event structure before kretprobe registration.
872 ret
= lttng_kretprobes_register(event_name
,
873 event_param
->u
.kretprobe
.symbol_name
,
874 event_param
->u
.kretprobe
.offset
,
875 event_param
->u
.kretprobe
.addr
,
876 event
, event_return
);
878 kmem_cache_free(event_cache
, event_return
);
882 /* Take 2 refs on the module: one per event. */
883 ret
= try_module_get(event
->desc
->owner
);
885 ret
= try_module_get(event
->desc
->owner
);
887 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
889 WARN_ON_ONCE(ret
> 0);
891 kmem_cache_free(event_cache
, event_return
);
892 module_put(event
->desc
->owner
);
893 module_put(event
->desc
->owner
);
894 goto statedump_error
;
896 list_add(&event_return
->list
, &chan
->session
->events
);
899 case LTTNG_KERNEL_NOOP
:
900 case LTTNG_KERNEL_SYSCALL
:
902 * Needs to be explicitly enabled after creation, since
903 * we may want to apply filters.
906 event
->registered
= 0;
907 event
->desc
= event_desc
;
908 switch (event_param
->u
.syscall
.entryexit
) {
909 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
912 case LTTNG_KERNEL_SYSCALL_ENTRY
:
913 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
915 case LTTNG_KERNEL_SYSCALL_EXIT
:
916 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
919 switch (event_param
->u
.syscall
.abi
) {
920 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
923 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
924 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
926 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
927 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
935 case LTTNG_KERNEL_UPROBE
:
937 * Needs to be explicitly enabled after creation, since
938 * we may want to apply filters.
941 event
->registered
= 1;
944 * Populate lttng_event structure before event
949 ret
= lttng_uprobes_register(event_param
->name
,
950 event_param
->u
.uprobe
.fd
,
954 ret
= try_module_get(event
->desc
->owner
);
957 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
963 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
964 WARN_ON_ONCE(ret
> 0);
966 goto statedump_error
;
968 hlist_add_head(&event
->hlist
, head
);
969 list_add(&event
->list
, &chan
->session
->events
);
973 /* If a statedump error occurs, events will not be readable. */
975 kmem_cache_free(event_cache
, event
);
983 struct lttng_event_notifier
*_lttng_event_notifier_create(
984 const struct lttng_event_desc
*event_desc
,
985 uint64_t token
, struct lttng_event_notifier_group
*event_notifier_group
,
986 struct lttng_kernel_event_notifier
*event_notifier_param
,
987 void *filter
, enum lttng_kernel_instrumentation itype
)
989 struct lttng_event_notifier
*event_notifier
;
990 const char *event_name
;
991 struct hlist_head
*head
;
995 case LTTNG_KERNEL_TRACEPOINT
:
996 case LTTNG_KERNEL_KPROBE
:
997 case LTTNG_KERNEL_UPROBE
:
998 case LTTNG_KERNEL_KRETPROBE
:
999 case LTTNG_KERNEL_FUNCTION
:
1000 case LTTNG_KERNEL_NOOP
:
1001 case LTTNG_KERNEL_SYSCALL
:
1008 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1009 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1010 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1011 WARN_ON_ONCE(!event_notifier
->desc
);
1012 if (!strncmp(event_notifier
->desc
->name
, event_name
,
1013 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1014 && event_notifier_group
== event_notifier
->group
1015 && token
== event_notifier
->user_token
) {
1021 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1022 if (!event_notifier
) {
1027 event_notifier
->group
= event_notifier_group
;
1028 event_notifier
->user_token
= token
;
1029 event_notifier
->filter
= filter
;
1030 event_notifier
->instrumentation
= itype
;
1031 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1032 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1033 INIT_LIST_HEAD(&event_notifier
->bytecode_runtime_head
);
1034 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1037 case LTTNG_KERNEL_TRACEPOINT
:
1038 /* Event will be enabled by enabler sync. */
1039 event_notifier
->enabled
= 0;
1040 event_notifier
->registered
= 0;
1041 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1042 if (!event_notifier
->desc
) {
1044 goto register_error
;
1046 /* Populate lttng_event_notifier structure before event registration. */
1049 case LTTNG_KERNEL_KPROBE
:
1050 case LTTNG_KERNEL_UPROBE
:
1051 case LTTNG_KERNEL_KRETPROBE
:
1052 case LTTNG_KERNEL_FUNCTION
:
1053 case LTTNG_KERNEL_NOOP
:
1054 case LTTNG_KERNEL_SYSCALL
:
1058 goto register_error
;
1061 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1062 hlist_add_head(&event_notifier
->hlist
, head
);
1063 return event_notifier
;
1066 kmem_cache_free(event_notifier_cache
, event_notifier
);
1070 return ERR_PTR(ret
);
1073 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1074 struct lttng_kernel_event
*event_param
,
1076 const struct lttng_event_desc
*event_desc
,
1077 enum lttng_kernel_instrumentation itype
)
1079 struct lttng_event
*event
;
1081 mutex_lock(&sessions_mutex
);
1082 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1084 mutex_unlock(&sessions_mutex
);
1088 struct lttng_event_notifier
*lttng_event_notifier_create(
1089 const struct lttng_event_desc
*event_desc
,
1090 uint64_t id
, struct lttng_event_notifier_group
*event_notifier_group
,
1091 struct lttng_kernel_event_notifier
*event_notifier_param
,
1092 void *filter
, enum lttng_kernel_instrumentation itype
)
1094 struct lttng_event_notifier
*event_notifier
;
1096 mutex_lock(&sessions_mutex
);
1097 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1098 event_notifier_group
, event_notifier_param
, filter
, itype
);
1099 mutex_unlock(&sessions_mutex
);
1100 return event_notifier
;
1103 /* Only used for tracepoints for now. */
1105 void register_event(struct lttng_event
*event
)
1107 const struct lttng_event_desc
*desc
;
1110 if (event
->registered
)
1114 switch (event
->instrumentation
) {
1115 case LTTNG_KERNEL_TRACEPOINT
:
1116 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1117 desc
->probe_callback
,
1120 case LTTNG_KERNEL_SYSCALL
:
1121 ret
= lttng_syscall_filter_enable(event
->chan
, event
);
1123 case LTTNG_KERNEL_KPROBE
:
1124 case LTTNG_KERNEL_UPROBE
:
1125 case LTTNG_KERNEL_KRETPROBE
:
1126 case LTTNG_KERNEL_NOOP
:
1129 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1134 event
->registered
= 1;
1138 * Only used internally at session destruction.
1140 int _lttng_event_unregister(struct lttng_event
*event
)
1142 const struct lttng_event_desc
*desc
;
1145 if (!event
->registered
)
1149 switch (event
->instrumentation
) {
1150 case LTTNG_KERNEL_TRACEPOINT
:
1151 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1152 event
->desc
->probe_callback
,
1155 case LTTNG_KERNEL_KPROBE
:
1156 lttng_kprobes_unregister(event
);
1159 case LTTNG_KERNEL_KRETPROBE
:
1160 lttng_kretprobes_unregister(event
);
1163 case LTTNG_KERNEL_SYSCALL
:
1164 ret
= lttng_syscall_filter_disable(event
->chan
, event
);
1166 case LTTNG_KERNEL_NOOP
:
1169 case LTTNG_KERNEL_UPROBE
:
1170 lttng_uprobes_unregister(event
);
1173 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1178 event
->registered
= 0;
1182 /* Only used for tracepoints for now. */
1184 void __always_unused
register_event_notifier(
1185 struct lttng_event_notifier
*event_notifier
)
1187 const struct lttng_event_desc
*desc
;
1190 if (event_notifier
->registered
)
1193 desc
= event_notifier
->desc
;
1194 switch (event_notifier
->instrumentation
) {
1195 case LTTNG_KERNEL_TRACEPOINT
:
1196 case LTTNG_KERNEL_SYSCALL
:
1197 case LTTNG_KERNEL_KPROBE
:
1198 case LTTNG_KERNEL_UPROBE
:
1199 case LTTNG_KERNEL_KRETPROBE
:
1200 case LTTNG_KERNEL_FUNCTION
:
1201 case LTTNG_KERNEL_NOOP
:
1206 event_notifier
->registered
= 1;
1210 int _lttng_event_notifier_unregister(
1211 struct lttng_event_notifier
*event_notifier
)
1213 const struct lttng_event_desc
*desc
;
1216 if (!event_notifier
->registered
)
1219 desc
= event_notifier
->desc
;
1220 switch (event_notifier
->instrumentation
) {
1221 case LTTNG_KERNEL_TRACEPOINT
:
1222 case LTTNG_KERNEL_KPROBE
:
1223 case LTTNG_KERNEL_KRETPROBE
:
1224 case LTTNG_KERNEL_FUNCTION
:
1225 case LTTNG_KERNEL_SYSCALL
:
1226 case LTTNG_KERNEL_NOOP
:
1227 case LTTNG_KERNEL_UPROBE
:
1232 event_notifier
->registered
= 0;
1237 * Only used internally at session destruction.
1240 void _lttng_event_destroy(struct lttng_event
*event
)
1242 switch (event
->instrumentation
) {
1243 case LTTNG_KERNEL_TRACEPOINT
:
1244 lttng_event_desc_put(event
->desc
);
1246 case LTTNG_KERNEL_KPROBE
:
1247 module_put(event
->desc
->owner
);
1248 lttng_kprobes_destroy_private(event
);
1250 case LTTNG_KERNEL_KRETPROBE
:
1251 module_put(event
->desc
->owner
);
1252 lttng_kretprobes_destroy_private(event
);
1254 case LTTNG_KERNEL_NOOP
:
1255 case LTTNG_KERNEL_SYSCALL
:
1257 case LTTNG_KERNEL_UPROBE
:
1258 module_put(event
->desc
->owner
);
1259 lttng_uprobes_destroy_private(event
);
1261 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1265 list_del(&event
->list
);
1266 lttng_destroy_context(event
->ctx
);
1267 kmem_cache_free(event_cache
, event
);
1271 * Only used internally at session destruction.
1274 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1276 switch (event_notifier
->instrumentation
) {
1277 case LTTNG_KERNEL_TRACEPOINT
:
1278 case LTTNG_KERNEL_KPROBE
:
1279 case LTTNG_KERNEL_KRETPROBE
:
1280 case LTTNG_KERNEL_FUNCTION
:
1281 case LTTNG_KERNEL_NOOP
:
1282 case LTTNG_KERNEL_SYSCALL
:
1283 case LTTNG_KERNEL_UPROBE
:
1287 list_del(&event_notifier
->list
);
1288 kmem_cache_free(event_notifier_cache
, event_notifier
);
1291 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1292 enum tracker_type tracker_type
)
1294 switch (tracker_type
) {
1296 return &session
->pid_tracker
;
1298 return &session
->vpid_tracker
;
1300 return &session
->uid_tracker
;
1302 return &session
->vuid_tracker
;
1304 return &session
->gid_tracker
;
1306 return &session
->vgid_tracker
;
1313 int lttng_session_track_id(struct lttng_session
*session
,
1314 enum tracker_type tracker_type
, int id
)
1316 struct lttng_id_tracker
*tracker
;
1319 tracker
= get_tracker(session
, tracker_type
);
1324 mutex_lock(&sessions_mutex
);
1326 /* track all ids: destroy tracker. */
1327 lttng_id_tracker_destroy(tracker
, true);
1330 ret
= lttng_id_tracker_add(tracker
, id
);
1332 mutex_unlock(&sessions_mutex
);
1336 int lttng_session_untrack_id(struct lttng_session
*session
,
1337 enum tracker_type tracker_type
, int id
)
1339 struct lttng_id_tracker
*tracker
;
1342 tracker
= get_tracker(session
, tracker_type
);
1347 mutex_lock(&sessions_mutex
);
1349 /* untrack all ids: replace by empty tracker. */
1350 ret
= lttng_id_tracker_empty_set(tracker
);
1352 ret
= lttng_id_tracker_del(tracker
, id
);
1354 mutex_unlock(&sessions_mutex
);
1359 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1361 struct lttng_id_tracker
*id_tracker
= m
->private;
1362 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1363 struct lttng_id_hash_node
*e
;
1366 mutex_lock(&sessions_mutex
);
1368 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1369 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1371 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1377 /* ID tracker disabled. */
1378 if (iter
>= *pos
&& iter
== 0) {
1379 return id_tracker_p
; /* empty tracker */
1387 /* Called with sessions_mutex held. */
1389 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1391 struct lttng_id_tracker
*id_tracker
= m
->private;
1392 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1393 struct lttng_id_hash_node
*e
;
1398 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1399 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1401 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1402 if (iter
++ >= *ppos
)
1407 /* ID tracker disabled. */
1408 if (iter
>= *ppos
&& iter
== 0)
1409 return p
; /* empty tracker */
1418 void id_list_stop(struct seq_file
*m
, void *p
)
1420 mutex_unlock(&sessions_mutex
);
1424 int id_list_show(struct seq_file
*m
, void *p
)
1426 struct lttng_id_tracker
*id_tracker
= m
->private;
1427 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1430 if (p
== id_tracker_p
) {
1431 /* Tracker disabled. */
1434 const struct lttng_id_hash_node
*e
= p
;
1436 id
= lttng_id_tracker_get_node_id(e
);
1438 switch (id_tracker
->tracker_type
) {
1440 seq_printf(m
, "process { pid = %d; };\n", id
);
1443 seq_printf(m
, "process { vpid = %d; };\n", id
);
1446 seq_printf(m
, "user { uid = %d; };\n", id
);
1449 seq_printf(m
, "user { vuid = %d; };\n", id
);
1452 seq_printf(m
, "group { gid = %d; };\n", id
);
1455 seq_printf(m
, "group { vgid = %d; };\n", id
);
1458 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1464 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1465 .start
= id_list_start
,
1466 .next
= id_list_next
,
1467 .stop
= id_list_stop
,
1468 .show
= id_list_show
,
1472 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1474 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1478 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1480 struct seq_file
*m
= file
->private_data
;
1481 struct lttng_id_tracker
*id_tracker
= m
->private;
1484 WARN_ON_ONCE(!id_tracker
);
1485 ret
= seq_release(inode
, file
);
1487 fput(id_tracker
->session
->file
);
1491 const struct file_operations lttng_tracker_ids_list_fops
= {
1492 .owner
= THIS_MODULE
,
1493 .open
= lttng_tracker_ids_list_open
,
1495 .llseek
= seq_lseek
,
1496 .release
= lttng_tracker_ids_list_release
,
1499 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1500 enum tracker_type tracker_type
)
1502 struct file
*tracker_ids_list_file
;
1506 file_fd
= lttng_get_unused_fd();
1512 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1513 <tng_tracker_ids_list_fops
,
1515 if (IS_ERR(tracker_ids_list_file
)) {
1516 ret
= PTR_ERR(tracker_ids_list_file
);
1519 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1521 goto refcount_error
;
1523 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1526 m
= tracker_ids_list_file
->private_data
;
1528 m
->private = get_tracker(session
, tracker_type
);
1529 BUG_ON(!m
->private);
1530 fd_install(file_fd
, tracker_ids_list_file
);
1535 atomic_long_dec(&session
->file
->f_count
);
1537 fput(tracker_ids_list_file
);
1539 put_unused_fd(file_fd
);
1545 * Enabler management.
1548 int lttng_match_enabler_star_glob(const char *desc_name
,
1549 const char *pattern
)
1551 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1552 desc_name
, LTTNG_SIZE_MAX
))
1558 int lttng_match_enabler_name(const char *desc_name
,
1561 if (strcmp(desc_name
, name
))
1567 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1568 struct lttng_enabler
*enabler
)
1570 const char *desc_name
, *enabler_name
;
1571 bool compat
= false, entry
= false;
1573 enabler_name
= enabler
->event_param
.name
;
1574 switch (enabler
->event_param
.instrumentation
) {
1575 case LTTNG_KERNEL_TRACEPOINT
:
1576 desc_name
= desc
->name
;
1577 switch (enabler
->format_type
) {
1578 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1579 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1580 case LTTNG_ENABLER_FORMAT_NAME
:
1581 return lttng_match_enabler_name(desc_name
, enabler_name
);
1586 case LTTNG_KERNEL_SYSCALL
:
1587 desc_name
= desc
->name
;
1588 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1589 desc_name
+= strlen("compat_");
1592 if (!strncmp(desc_name
, "syscall_exit_",
1593 strlen("syscall_exit_"))) {
1594 desc_name
+= strlen("syscall_exit_");
1595 } else if (!strncmp(desc_name
, "syscall_entry_",
1596 strlen("syscall_entry_"))) {
1597 desc_name
+= strlen("syscall_entry_");
1603 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1604 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1606 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1610 case LTTNG_KERNEL_SYSCALL_EXIT
:
1617 switch (enabler
->event_param
.u
.syscall
.abi
) {
1618 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1620 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1624 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1631 switch (enabler
->event_param
.u
.syscall
.match
) {
1632 case LTTNG_SYSCALL_MATCH_NAME
:
1633 switch (enabler
->format_type
) {
1634 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1635 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1636 case LTTNG_ENABLER_FORMAT_NAME
:
1637 return lttng_match_enabler_name(desc_name
, enabler_name
);
1642 case LTTNG_SYSCALL_MATCH_NR
:
1643 return -EINVAL
; /* Not implemented. */
1655 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1656 struct lttng_event
*event
)
1658 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1661 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1663 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1664 && event
->chan
== event_enabler
->chan
)
1671 struct lttng_enabler_ref
*lttng_enabler_ref(
1672 struct list_head
*enablers_ref_list
,
1673 struct lttng_enabler
*enabler
)
1675 struct lttng_enabler_ref
*enabler_ref
;
1677 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
1678 if (enabler_ref
->ref
== enabler
)
1685 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1687 struct lttng_session
*session
= event_enabler
->chan
->session
;
1688 struct lttng_probe_desc
*probe_desc
;
1689 const struct lttng_event_desc
*desc
;
1691 struct list_head
*probe_list
;
1693 probe_list
= lttng_get_probe_list_head();
1695 * For each probe event, if we find that a probe event matches
1696 * our enabler, create an associated lttng_event if not
1699 list_for_each_entry(probe_desc
, probe_list
, head
) {
1700 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1702 struct hlist_head
*head
;
1703 struct lttng_event
*event
;
1705 desc
= probe_desc
->event_desc
[i
];
1706 if (!lttng_desc_match_enabler(desc
,
1707 lttng_event_enabler_as_enabler(event_enabler
)))
1711 * Check if already created.
1713 head
= utils_borrow_hash_table_bucket(
1714 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
1716 lttng_hlist_for_each_entry(event
, head
, hlist
) {
1717 if (event
->desc
== desc
1718 && event
->chan
== event_enabler
->chan
)
1725 * We need to create an event for this
1728 event
= _lttng_event_create(event_enabler
->chan
,
1730 LTTNG_KERNEL_TRACEPOINT
);
1732 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
1733 probe_desc
->event_desc
[i
]->name
);
1740 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1744 ret
= lttng_syscalls_register(event_enabler
->chan
, NULL
);
1749 * Create struct lttng_event if it is missing and present in the list of
1750 * tracepoint probes.
1751 * Should be called with sessions mutex held.
1754 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1756 switch (event_enabler
->base
.event_param
.instrumentation
) {
1757 case LTTNG_KERNEL_TRACEPOINT
:
1758 lttng_create_tracepoint_event_if_missing(event_enabler
);
1760 case LTTNG_KERNEL_SYSCALL
:
1761 lttng_create_syscall_event_if_missing(event_enabler
);
1770 * Create events associated with an event_enabler (if not already present),
1771 * and add backward reference from the event to the enabler.
1772 * Should be called with sessions mutex held.
1775 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1777 struct lttng_channel
*chan
= event_enabler
->chan
;
1778 struct lttng_session
*session
= event_enabler
->chan
->session
;
1779 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
1780 struct lttng_event
*event
;
1782 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
1783 base_enabler
->event_param
.u
.syscall
.entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
&&
1784 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
1785 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_SYSCALL_MATCH_NAME
&&
1786 !strcmp(base_enabler
->event_param
.name
, "*")) {
1787 if (base_enabler
->enabled
)
1788 WRITE_ONCE(chan
->syscall_all
, 1);
1790 WRITE_ONCE(chan
->syscall_all
, 0);
1793 /* First ensure that probe events are created for this enabler. */
1794 lttng_create_event_if_missing(event_enabler
);
1796 /* For each event matching event_enabler in session event list. */
1797 list_for_each_entry(event
, &session
->events
, list
) {
1798 struct lttng_enabler_ref
*enabler_ref
;
1800 if (!lttng_event_enabler_match_event(event_enabler
, event
))
1802 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
1803 lttng_event_enabler_as_enabler(event_enabler
));
1806 * If no backward ref, create it.
1807 * Add backward ref from event to event_enabler.
1809 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
1812 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
1813 list_add(&enabler_ref
->node
,
1814 &event
->enablers_ref_head
);
1818 * Link filter bytecodes if not linked yet.
1820 lttng_enabler_link_bytecode(event
->desc
,
1822 &event
->bytecode_runtime_head
,
1823 lttng_event_enabler_as_enabler(event_enabler
));
1825 /* TODO: merge event context. */
1831 * Called at module load: connect the probe on all enablers matching
1833 * Called with sessions lock held.
1835 int lttng_fix_pending_events(void)
1837 struct lttng_session
*session
;
1839 list_for_each_entry(session
, &sessions
, list
)
1840 lttng_session_lazy_sync_event_enablers(session
);
1844 struct lttng_event_enabler
*lttng_event_enabler_create(
1845 enum lttng_enabler_format_type format_type
,
1846 struct lttng_kernel_event
*event_param
,
1847 struct lttng_channel
*chan
)
1849 struct lttng_event_enabler
*event_enabler
;
1851 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
1854 event_enabler
->base
.format_type
= format_type
;
1855 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1856 memcpy(&event_enabler
->base
.event_param
, event_param
,
1857 sizeof(event_enabler
->base
.event_param
));
1858 event_enabler
->chan
= chan
;
1860 event_enabler
->base
.enabled
= 0;
1861 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
1862 mutex_lock(&sessions_mutex
);
1863 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
1864 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1865 mutex_unlock(&sessions_mutex
);
1866 return event_enabler
;
1869 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1871 mutex_lock(&sessions_mutex
);
1872 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1873 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1874 mutex_unlock(&sessions_mutex
);
1878 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1880 mutex_lock(&sessions_mutex
);
1881 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1882 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1883 mutex_unlock(&sessions_mutex
);
1888 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1889 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1891 struct lttng_filter_bytecode_node
*bytecode_node
;
1892 uint32_t bytecode_len
;
1895 ret
= get_user(bytecode_len
, &bytecode
->len
);
1898 bytecode_node
= kzalloc(sizeof(*bytecode_node
) + bytecode_len
,
1902 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
1903 sizeof(*bytecode
) + bytecode_len
);
1907 bytecode_node
->enabler
= enabler
;
1908 /* Enforce length based on allocated size */
1909 bytecode_node
->bc
.len
= bytecode_len
;
1910 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
1915 kfree(bytecode_node
);
1919 int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler
*event_enabler
,
1920 struct lttng_kernel_filter_bytecode __user
*bytecode
)
1923 ret
= lttng_enabler_attach_bytecode(
1924 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1928 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1935 int lttng_event_add_callsite(struct lttng_event
*event
,
1936 struct lttng_kernel_event_callsite __user
*callsite
)
1939 switch (event
->instrumentation
) {
1940 case LTTNG_KERNEL_UPROBE
:
1941 return lttng_uprobes_add_callsite(event
, callsite
);
1947 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
1948 struct lttng_kernel_context
*context_param
)
1954 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1956 struct lttng_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1958 /* Destroy filter bytecode */
1959 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1960 &enabler
->filter_bytecode_head
, node
) {
1966 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1968 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1970 /* Destroy contexts */
1971 lttng_destroy_context(event_enabler
->ctx
);
1973 list_del(&event_enabler
->node
);
1974 kfree(event_enabler
);
1977 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1978 struct lttng_event_notifier_group
*event_notifier_group
,
1979 enum lttng_enabler_format_type format_type
,
1980 struct lttng_kernel_event_notifier
*event_notifier_param
)
1982 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1984 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
1985 if (!event_notifier_enabler
)
1988 event_notifier_enabler
->base
.format_type
= format_type
;
1989 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1991 memcpy(&event_notifier_enabler
->base
.event_param
.name
, event_notifier_param
->event
.name
,
1992 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1993 event_notifier_enabler
->base
.event_param
.instrumentation
= event_notifier_param
->event
.instrumentation
;
1994 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
1996 event_notifier_enabler
->base
.enabled
= 0;
1997 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
1998 event_notifier_enabler
->group
= event_notifier_group
;
2000 mutex_lock(&sessions_mutex
);
2001 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2003 mutex_unlock(&sessions_mutex
);
2005 return event_notifier_enabler
;
2008 int lttng_event_notifier_enabler_enable(
2009 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2011 mutex_lock(&sessions_mutex
);
2012 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2013 mutex_unlock(&sessions_mutex
);
2017 int lttng_event_notifier_enabler_disable(
2018 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2020 mutex_lock(&sessions_mutex
);
2021 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2022 mutex_unlock(&sessions_mutex
);
2026 int lttng_event_notifier_enabler_attach_bytecode(
2027 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2028 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2032 ret
= lttng_enabler_attach_bytecode(
2033 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2044 int lttng_event_notifier_enabler_attach_context(
2045 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2046 struct lttng_kernel_context
*context_param
)
2052 void lttng_event_notifier_enabler_destroy(
2053 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2055 if (!event_notifier_enabler
) {
2059 list_del(&event_notifier_enabler
->node
);
2061 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2062 kfree(event_notifier_enabler
);
2066 * lttng_session_sync_event_enablers should be called just before starting a
2068 * Should be called with sessions mutex held.
2071 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2073 struct lttng_event_enabler
*event_enabler
;
2074 struct lttng_event
*event
;
2076 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2077 lttng_event_enabler_ref_events(event_enabler
);
2079 * For each event, if at least one of its enablers is enabled,
2080 * and its channel and session transient states are enabled, we
2081 * enable the event, else we disable it.
2083 list_for_each_entry(event
, &session
->events
, list
) {
2084 struct lttng_enabler_ref
*enabler_ref
;
2085 struct lttng_bytecode_runtime
*runtime
;
2086 int enabled
= 0, has_enablers_without_bytecode
= 0;
2088 switch (event
->instrumentation
) {
2089 case LTTNG_KERNEL_TRACEPOINT
:
2090 case LTTNG_KERNEL_SYSCALL
:
2092 list_for_each_entry(enabler_ref
,
2093 &event
->enablers_ref_head
, node
) {
2094 if (enabler_ref
->ref
->enabled
) {
2101 /* Not handled with lazy sync. */
2105 * Enabled state is based on union of enablers, with
2106 * intesection of session and channel transient enable
2109 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2111 WRITE_ONCE(event
->enabled
, enabled
);
2113 * Sync tracepoint registration with event enabled
2117 register_event(event
);
2119 _lttng_event_unregister(event
);
2122 /* Check if has enablers without bytecode enabled */
2123 list_for_each_entry(enabler_ref
,
2124 &event
->enablers_ref_head
, node
) {
2125 if (enabler_ref
->ref
->enabled
2126 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2127 has_enablers_without_bytecode
= 1;
2131 event
->has_enablers_without_bytecode
=
2132 has_enablers_without_bytecode
;
2134 /* Enable filters */
2135 list_for_each_entry(runtime
,
2136 &event
->bytecode_runtime_head
, node
)
2137 lttng_filter_sync_state(runtime
);
2142 * Apply enablers to session events, adding events to session if need
2143 * be. It is required after each modification applied to an active
2144 * session, and right before session "start".
2145 * "lazy" sync means we only sync if required.
2146 * Should be called with sessions mutex held.
2149 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2151 /* We can skip if session is not active */
2152 if (!session
->active
)
2154 lttng_session_sync_event_enablers(session
);
2158 * Serialize at most one packet worth of metadata into a metadata
2160 * We grab the metadata cache mutex to get exclusive access to our metadata
2161 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2162 * allows us to do racy operations such as looking for remaining space left in
2163 * packet and write, since mutual exclusion protects us from concurrent writes.
2164 * Mutual exclusion on the metadata cache allow us to read the cache content
2165 * without racing against reallocation of the cache by updates.
2166 * Returns the number of bytes written in the channel, 0 if no data
2167 * was written and a negative value on error.
2169 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2170 struct channel
*chan
, bool *coherent
)
2172 struct lib_ring_buffer_ctx ctx
;
2174 size_t len
, reserve_len
;
2177 * Ensure we support mutiple get_next / put sequences followed by
2178 * put_next. The metadata cache lock protects reading the metadata
2179 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2180 * "flush" operations on the buffer invoked by different processes.
2181 * Moreover, since the metadata cache memory can be reallocated, we
2182 * need to have exclusive access against updates even though we only
2185 mutex_lock(&stream
->metadata_cache
->lock
);
2186 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2187 if (stream
->metadata_in
!= stream
->metadata_out
)
2190 /* Metadata regenerated, change the version. */
2191 if (stream
->metadata_cache
->version
!= stream
->version
)
2192 stream
->version
= stream
->metadata_cache
->version
;
2194 len
= stream
->metadata_cache
->metadata_written
-
2195 stream
->metadata_in
;
2198 reserve_len
= min_t(size_t,
2199 stream
->transport
->ops
.packet_avail_size(chan
),
2201 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2204 * If reservation failed, return an error to the caller.
2206 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2208 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2209 stream
->coherent
= false;
2212 stream
->transport
->ops
.event_write(&ctx
,
2213 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2215 stream
->transport
->ops
.event_commit(&ctx
);
2216 stream
->metadata_in
+= reserve_len
;
2217 if (reserve_len
< len
)
2218 stream
->coherent
= false;
2220 stream
->coherent
= true;
2225 *coherent
= stream
->coherent
;
2226 mutex_unlock(&stream
->metadata_cache
->lock
);
2231 void lttng_metadata_begin(struct lttng_session
*session
)
2233 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2234 mutex_lock(&session
->metadata_cache
->lock
);
2238 void lttng_metadata_end(struct lttng_session
*session
)
2240 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2241 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2242 struct lttng_metadata_stream
*stream
;
2244 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2245 wake_up_interruptible(&stream
->read_wait
);
2246 mutex_unlock(&session
->metadata_cache
->lock
);
2251 * Write the metadata to the metadata cache.
2252 * Must be called with sessions_mutex held.
2253 * The metadata cache lock protects us from concurrent read access from
2254 * thread outputting metadata content to ring buffer.
2255 * The content of the printf is printed as a single atomic metadata
2258 int lttng_metadata_printf(struct lttng_session
*session
,
2259 const char *fmt
, ...)
2265 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2268 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2274 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2275 if (session
->metadata_cache
->metadata_written
+ len
>
2276 session
->metadata_cache
->cache_alloc
) {
2277 char *tmp_cache_realloc
;
2278 unsigned int tmp_cache_alloc_size
;
2280 tmp_cache_alloc_size
= max_t(unsigned int,
2281 session
->metadata_cache
->cache_alloc
+ len
,
2282 session
->metadata_cache
->cache_alloc
<< 1);
2283 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2284 if (!tmp_cache_realloc
)
2286 if (session
->metadata_cache
->data
) {
2287 memcpy(tmp_cache_realloc
,
2288 session
->metadata_cache
->data
,
2289 session
->metadata_cache
->cache_alloc
);
2290 vfree(session
->metadata_cache
->data
);
2293 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2294 session
->metadata_cache
->data
= tmp_cache_realloc
;
2296 memcpy(session
->metadata_cache
->data
+
2297 session
->metadata_cache
->metadata_written
,
2299 session
->metadata_cache
->metadata_written
+= len
;
2310 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2314 for (i
= 0; i
< nesting
; i
++) {
2317 ret
= lttng_metadata_printf(session
, " ");
2326 int lttng_field_name_statedump(struct lttng_session
*session
,
2327 const struct lttng_event_field
*field
,
2330 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2334 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2335 const struct lttng_type
*type
,
2340 WARN_ON_ONCE(type
->atype
!= atype_integer
);
2341 ret
= print_tabs(session
, nesting
);
2344 ret
= lttng_metadata_printf(session
,
2345 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2346 type
->u
.integer
.size
,
2347 type
->u
.integer
.alignment
,
2348 type
->u
.integer
.signedness
,
2349 (type
->u
.integer
.encoding
== lttng_encode_none
)
2351 : (type
->u
.integer
.encoding
== lttng_encode_UTF8
)
2354 type
->u
.integer
.base
,
2355 #if __BYTE_ORDER == __BIG_ENDIAN
2356 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
2358 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
2365 * Must be called with sessions_mutex held.
2368 int _lttng_struct_type_statedump(struct lttng_session
*session
,
2369 const struct lttng_type
*type
,
2373 uint32_t i
, nr_fields
;
2374 unsigned int alignment
;
2376 WARN_ON_ONCE(type
->atype
!= atype_struct_nestable
);
2378 ret
= print_tabs(session
, nesting
);
2381 ret
= lttng_metadata_printf(session
,
2385 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
2386 for (i
= 0; i
< nr_fields
; i
++) {
2387 const struct lttng_event_field
*iter_field
;
2389 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
2390 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2394 ret
= print_tabs(session
, nesting
);
2397 alignment
= type
->u
.struct_nestable
.alignment
;
2399 ret
= lttng_metadata_printf(session
,
2403 ret
= lttng_metadata_printf(session
,
2410 * Must be called with sessions_mutex held.
2413 int _lttng_struct_field_statedump(struct lttng_session
*session
,
2414 const struct lttng_event_field
*field
,
2419 ret
= _lttng_struct_type_statedump(session
,
2420 &field
->type
, nesting
);
2423 return lttng_field_name_statedump(session
, field
, nesting
);
2427 * Must be called with sessions_mutex held.
2430 int _lttng_variant_type_statedump(struct lttng_session
*session
,
2431 const struct lttng_type
*type
,
2435 uint32_t i
, nr_choices
;
2437 WARN_ON_ONCE(type
->atype
!= atype_variant_nestable
);
2439 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2441 if (type
->u
.variant_nestable
.alignment
!= 0)
2443 ret
= print_tabs(session
, nesting
);
2446 ret
= lttng_metadata_printf(session
,
2447 "variant <_%s> {\n",
2448 type
->u
.variant_nestable
.tag_name
);
2451 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
2452 for (i
= 0; i
< nr_choices
; i
++) {
2453 const struct lttng_event_field
*iter_field
;
2455 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
2456 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
2460 ret
= print_tabs(session
, nesting
);
2463 ret
= lttng_metadata_printf(session
,
2469 * Must be called with sessions_mutex held.
2472 int _lttng_variant_field_statedump(struct lttng_session
*session
,
2473 const struct lttng_event_field
*field
,
2478 ret
= _lttng_variant_type_statedump(session
,
2479 &field
->type
, nesting
);
2482 return lttng_field_name_statedump(session
, field
, nesting
);
2486 * Must be called with sessions_mutex held.
2489 int _lttng_array_field_statedump(struct lttng_session
*session
,
2490 const struct lttng_event_field
*field
,
2494 const struct lttng_type
*elem_type
;
2496 WARN_ON_ONCE(field
->type
.atype
!= atype_array_nestable
);
2498 if (field
->type
.u
.array_nestable
.alignment
) {
2499 ret
= print_tabs(session
, nesting
);
2502 ret
= lttng_metadata_printf(session
,
2503 "struct { } align(%u) _%s_padding;\n",
2504 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
2510 * Nested compound types: Only array of structures and variants are
2511 * currently supported.
2513 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
2514 switch (elem_type
->atype
) {
2516 case atype_struct_nestable
:
2517 case atype_variant_nestable
:
2518 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2526 ret
= lttng_metadata_printf(session
,
2529 field
->type
.u
.array_nestable
.length
);
2534 * Must be called with sessions_mutex held.
2537 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
2538 const struct lttng_event_field
*field
,
2542 const char *length_name
;
2543 const struct lttng_type
*elem_type
;
2545 WARN_ON_ONCE(field
->type
.atype
!= atype_sequence_nestable
);
2547 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
2549 if (field
->type
.u
.sequence_nestable
.alignment
) {
2550 ret
= print_tabs(session
, nesting
);
2553 ret
= lttng_metadata_printf(session
,
2554 "struct { } align(%u) _%s_padding;\n",
2555 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
2562 * Nested compound types: Only array of structures and variants are
2563 * currently supported.
2565 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
2566 switch (elem_type
->atype
) {
2568 case atype_struct_nestable
:
2569 case atype_variant_nestable
:
2570 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
2578 ret
= lttng_metadata_printf(session
,
2581 field
->type
.u
.sequence_nestable
.length_name
);
2586 * Must be called with sessions_mutex held.
2589 int _lttng_enum_type_statedump(struct lttng_session
*session
,
2590 const struct lttng_type
*type
,
2593 const struct lttng_enum_desc
*enum_desc
;
2594 const struct lttng_type
*container_type
;
2596 unsigned int i
, nr_entries
;
2598 container_type
= type
->u
.enum_nestable
.container_type
;
2599 if (container_type
->atype
!= atype_integer
) {
2603 enum_desc
= type
->u
.enum_nestable
.desc
;
2604 nr_entries
= enum_desc
->nr_entries
;
2606 ret
= print_tabs(session
, nesting
);
2609 ret
= lttng_metadata_printf(session
, "enum : ");
2612 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
2615 ret
= lttng_metadata_printf(session
, " {\n");
2618 /* Dump all entries */
2619 for (i
= 0; i
< nr_entries
; i
++) {
2620 const struct lttng_enum_entry
*entry
= &enum_desc
->entries
[i
];
2623 ret
= print_tabs(session
, nesting
+ 1);
2626 ret
= lttng_metadata_printf(session
,
2630 len
= strlen(entry
->string
);
2631 /* Escape the character '"' */
2632 for (j
= 0; j
< len
; j
++) {
2633 char c
= entry
->string
[j
];
2637 ret
= lttng_metadata_printf(session
,
2641 ret
= lttng_metadata_printf(session
,
2645 ret
= lttng_metadata_printf(session
,
2652 ret
= lttng_metadata_printf(session
, "\"");
2656 if (entry
->options
.is_auto
) {
2657 ret
= lttng_metadata_printf(session
, ",\n");
2661 ret
= lttng_metadata_printf(session
,
2665 if (entry
->start
.signedness
)
2666 ret
= lttng_metadata_printf(session
,
2667 "%lld", (long long) entry
->start
.value
);
2669 ret
= lttng_metadata_printf(session
,
2670 "%llu", entry
->start
.value
);
2673 if (entry
->start
.signedness
== entry
->end
.signedness
&&
2675 == entry
->end
.value
) {
2676 ret
= lttng_metadata_printf(session
,
2679 if (entry
->end
.signedness
) {
2680 ret
= lttng_metadata_printf(session
,
2682 (long long) entry
->end
.value
);
2684 ret
= lttng_metadata_printf(session
,
2693 ret
= print_tabs(session
, nesting
);
2696 ret
= lttng_metadata_printf(session
, "}");
2702 * Must be called with sessions_mutex held.
2705 int _lttng_enum_field_statedump(struct lttng_session
*session
,
2706 const struct lttng_event_field
*field
,
2711 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
2714 return lttng_field_name_statedump(session
, field
, nesting
);
2718 int _lttng_integer_field_statedump(struct lttng_session
*session
,
2719 const struct lttng_event_field
*field
,
2724 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
2727 return lttng_field_name_statedump(session
, field
, nesting
);
2731 int _lttng_string_type_statedump(struct lttng_session
*session
,
2732 const struct lttng_type
*type
,
2737 WARN_ON_ONCE(type
->atype
!= atype_string
);
2738 /* Default encoding is UTF8 */
2739 ret
= print_tabs(session
, nesting
);
2742 ret
= lttng_metadata_printf(session
,
2744 type
->u
.string
.encoding
== lttng_encode_ASCII
?
2745 " { encoding = ASCII; }" : "");
2750 int _lttng_string_field_statedump(struct lttng_session
*session
,
2751 const struct lttng_event_field
*field
,
2756 WARN_ON_ONCE(field
->type
.atype
!= atype_string
);
2757 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
2760 return lttng_field_name_statedump(session
, field
, nesting
);
2764 * Must be called with sessions_mutex held.
2767 int _lttng_type_statedump(struct lttng_session
*session
,
2768 const struct lttng_type
*type
,
2773 switch (type
->atype
) {
2775 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
2777 case atype_enum_nestable
:
2778 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
2781 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
2783 case atype_struct_nestable
:
2784 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
2786 case atype_variant_nestable
:
2787 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
2790 /* Nested arrays and sequences are not supported yet. */
2791 case atype_array_nestable
:
2792 case atype_sequence_nestable
:
2801 * Must be called with sessions_mutex held.
2804 int _lttng_field_statedump(struct lttng_session
*session
,
2805 const struct lttng_event_field
*field
,
2810 switch (field
->type
.atype
) {
2812 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
2814 case atype_enum_nestable
:
2815 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
2818 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
2820 case atype_struct_nestable
:
2821 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
2823 case atype_array_nestable
:
2824 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
2826 case atype_sequence_nestable
:
2827 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
2829 case atype_variant_nestable
:
2830 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
2841 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
2842 struct lttng_ctx
*ctx
)
2849 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
2850 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
2852 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
2860 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
2861 struct lttng_event
*event
)
2863 const struct lttng_event_desc
*desc
= event
->desc
;
2867 for (i
= 0; i
< desc
->nr_fields
; i
++) {
2868 const struct lttng_event_field
*field
= &desc
->fields
[i
];
2870 ret
= _lttng_field_statedump(session
, field
, 2);
2878 * Must be called with sessions_mutex held.
2879 * The entire event metadata is printed as a single atomic metadata
2883 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
2884 struct lttng_channel
*chan
,
2885 struct lttng_event
*event
)
2889 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
2891 if (chan
->channel_type
== METADATA_CHANNEL
)
2894 lttng_metadata_begin(session
);
2896 ret
= lttng_metadata_printf(session
,
2900 " stream_id = %u;\n",
2908 ret
= lttng_metadata_printf(session
,
2909 " context := struct {\n");
2913 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
2917 ret
= lttng_metadata_printf(session
,
2923 ret
= lttng_metadata_printf(session
,
2924 " fields := struct {\n"
2929 ret
= _lttng_fields_metadata_statedump(session
, event
);
2934 * LTTng space reservation can only reserve multiples of the
2937 ret
= lttng_metadata_printf(session
,
2943 event
->metadata_dumped
= 1;
2945 lttng_metadata_end(session
);
2951 * Must be called with sessions_mutex held.
2952 * The entire channel metadata is printed as a single atomic metadata
2956 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
2957 struct lttng_channel
*chan
)
2961 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
2964 if (chan
->channel_type
== METADATA_CHANNEL
)
2967 lttng_metadata_begin(session
);
2969 WARN_ON_ONCE(!chan
->header_type
);
2970 ret
= lttng_metadata_printf(session
,
2973 " event.header := %s;\n"
2974 " packet.context := struct packet_context;\n",
2976 chan
->header_type
== 1 ? "struct event_header_compact" :
2977 "struct event_header_large");
2982 ret
= lttng_metadata_printf(session
,
2983 " event.context := struct {\n");
2987 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
2991 ret
= lttng_metadata_printf(session
,
2997 ret
= lttng_metadata_printf(session
,
3000 chan
->metadata_dumped
= 1;
3002 lttng_metadata_end(session
);
3007 * Must be called with sessions_mutex held.
3010 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3012 return lttng_metadata_printf(session
,
3013 "struct packet_context {\n"
3014 " uint64_clock_monotonic_t timestamp_begin;\n"
3015 " uint64_clock_monotonic_t timestamp_end;\n"
3016 " uint64_t content_size;\n"
3017 " uint64_t packet_size;\n"
3018 " uint64_t packet_seq_num;\n"
3019 " unsigned long events_discarded;\n"
3020 " uint32_t cpu_id;\n"
3027 * id: range: 0 - 30.
3028 * id 31 is reserved to indicate an extended header.
3031 * id: range: 0 - 65534.
3032 * id 65535 is reserved to indicate an extended header.
3034 * Must be called with sessions_mutex held.
3037 int _lttng_event_header_declare(struct lttng_session
*session
)
3039 return lttng_metadata_printf(session
,
3040 "struct event_header_compact {\n"
3041 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3044 " uint27_clock_monotonic_t timestamp;\n"
3048 " uint64_clock_monotonic_t timestamp;\n"
3053 "struct event_header_large {\n"
3054 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3057 " uint32_clock_monotonic_t timestamp;\n"
3061 " uint64_clock_monotonic_t timestamp;\n"
3065 lttng_alignof(uint32_t) * CHAR_BIT
,
3066 lttng_alignof(uint16_t) * CHAR_BIT
3071 * Approximation of NTP time of day to clock monotonic correlation,
3072 * taken at start of trace.
3073 * Yes, this is only an approximation. Yes, we can (and will) do better
3074 * in future versions.
3075 * This function may return a negative offset. It may happen if the
3076 * system sets the REALTIME clock to 0 after boot.
3078 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3082 int64_t measure_clock_offset(void)
3084 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3085 uint64_t tcf
= trace_clock_freq();
3087 unsigned long flags
;
3088 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3089 struct timespec64 rts
= { 0, 0 };
3091 struct timespec rts
= { 0, 0 };
3094 /* Disable interrupts to increase correlation precision. */
3095 local_irq_save(flags
);
3096 monotonic
[0] = trace_clock_read64();
3097 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3098 ktime_get_real_ts64(&rts
);
3100 getnstimeofday(&rts
);
3102 monotonic
[1] = trace_clock_read64();
3103 local_irq_restore(flags
);
3105 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3106 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3107 if (tcf
== NSEC_PER_SEC
) {
3108 realtime
+= rts
.tv_nsec
;
3110 uint64_t n
= rts
.tv_nsec
* tcf
;
3112 do_div(n
, NSEC_PER_SEC
);
3115 offset
= (int64_t) realtime
- monotonic_avg
;
3120 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3128 while (cur
!= '\0') {
3131 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3135 ret
= lttng_metadata_printf(session
, "%c", '\\');
3138 /* We still print the current char */
3141 ret
= lttng_metadata_printf(session
, "%c", cur
);
3155 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3156 const char *field_value
)
3160 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3164 ret
= print_escaped_ctf_string(session
, field_value
);
3168 ret
= lttng_metadata_printf(session
, "\";\n");
3175 * Output metadata into this session's metadata buffers.
3176 * Must be called with sessions_mutex held.
3179 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3181 unsigned char *uuid_c
= session
->uuid
.b
;
3182 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3183 const char *product_uuid
;
3184 struct lttng_channel
*chan
;
3185 struct lttng_event
*event
;
3188 if (!LTTNG_READ_ONCE(session
->active
))
3191 lttng_metadata_begin(session
);
3193 if (session
->metadata_dumped
)
3196 snprintf(uuid_s
, sizeof(uuid_s
),
3197 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3198 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3199 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3200 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3201 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3203 ret
= lttng_metadata_printf(session
,
3204 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3205 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3206 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3207 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3208 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3209 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3210 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3216 " byte_order = %s;\n"
3217 " packet.header := struct {\n"
3218 " uint32_t magic;\n"
3219 " uint8_t uuid[16];\n"
3220 " uint32_t stream_id;\n"
3221 " uint64_t stream_instance_id;\n"
3224 lttng_alignof(uint8_t) * CHAR_BIT
,
3225 lttng_alignof(uint16_t) * CHAR_BIT
,
3226 lttng_alignof(uint32_t) * CHAR_BIT
,
3227 lttng_alignof(uint64_t) * CHAR_BIT
,
3228 sizeof(unsigned long) * CHAR_BIT
,
3229 lttng_alignof(unsigned long) * CHAR_BIT
,
3233 #if __BYTE_ORDER == __BIG_ENDIAN
3242 ret
= lttng_metadata_printf(session
,
3244 " hostname = \"%s\";\n"
3245 " domain = \"kernel\";\n"
3246 " sysname = \"%s\";\n"
3247 " kernel_release = \"%s\";\n"
3248 " kernel_version = \"%s\";\n"
3249 " tracer_name = \"lttng-modules\";\n"
3250 " tracer_major = %d;\n"
3251 " tracer_minor = %d;\n"
3252 " tracer_patchlevel = %d;\n"
3253 " trace_buffering_scheme = \"global\";\n",
3254 current
->nsproxy
->uts_ns
->name
.nodename
,
3258 LTTNG_MODULES_MAJOR_VERSION
,
3259 LTTNG_MODULES_MINOR_VERSION
,
3260 LTTNG_MODULES_PATCHLEVEL_VERSION
3265 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3268 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3269 session
->creation_time
);
3273 /* Add the product UUID to the 'env' section */
3274 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3276 ret
= lttng_metadata_printf(session
,
3277 " product_uuid = \"%s\";\n",
3284 /* Close the 'env' section */
3285 ret
= lttng_metadata_printf(session
, "};\n\n");
3289 ret
= lttng_metadata_printf(session
,
3291 " name = \"%s\";\n",
3297 if (!trace_clock_uuid(clock_uuid_s
)) {
3298 ret
= lttng_metadata_printf(session
,
3299 " uuid = \"%s\";\n",
3306 ret
= lttng_metadata_printf(session
,
3307 " description = \"%s\";\n"
3308 " freq = %llu; /* Frequency, in Hz */\n"
3309 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3312 trace_clock_description(),
3313 (unsigned long long) trace_clock_freq(),
3314 (long long) measure_clock_offset()
3319 ret
= lttng_metadata_printf(session
,
3320 "typealias integer {\n"
3321 " size = 27; align = 1; signed = false;\n"
3322 " map = clock.%s.value;\n"
3323 "} := uint27_clock_monotonic_t;\n"
3325 "typealias integer {\n"
3326 " size = 32; align = %u; signed = false;\n"
3327 " map = clock.%s.value;\n"
3328 "} := uint32_clock_monotonic_t;\n"
3330 "typealias integer {\n"
3331 " size = 64; align = %u; signed = false;\n"
3332 " map = clock.%s.value;\n"
3333 "} := uint64_clock_monotonic_t;\n\n",
3335 lttng_alignof(uint32_t) * CHAR_BIT
,
3337 lttng_alignof(uint64_t) * CHAR_BIT
,
3343 ret
= _lttng_stream_packet_context_declare(session
);
3347 ret
= _lttng_event_header_declare(session
);
3352 list_for_each_entry(chan
, &session
->chan
, list
) {
3353 ret
= _lttng_channel_metadata_statedump(session
, chan
);
3358 list_for_each_entry(event
, &session
->events
, list
) {
3359 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
3363 session
->metadata_dumped
= 1;
3365 lttng_metadata_end(session
);
3370 * lttng_transport_register - LTT transport registration
3371 * @transport: transport structure
3373 * Registers a transport which can be used as output to extract the data out of
3374 * LTTng. The module calling this registration function must ensure that no
3375 * trap-inducing code will be executed by the transport functions. E.g.
3376 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3377 * is made visible to the transport function. This registration acts as a
3378 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3379 * after its registration must it synchronize the TLBs.
3381 void lttng_transport_register(struct lttng_transport
*transport
)
3384 * Make sure no page fault can be triggered by the module about to be
3385 * registered. We deal with this here so we don't have to call
3386 * vmalloc_sync_mappings() in each module's init.
3388 wrapper_vmalloc_sync_mappings();
3390 mutex_lock(&sessions_mutex
);
3391 list_add_tail(&transport
->node
, <tng_transport_list
);
3392 mutex_unlock(&sessions_mutex
);
3394 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3397 * lttng_transport_unregister - LTT transport unregistration
3398 * @transport: transport structure
3400 void lttng_transport_unregister(struct lttng_transport
*transport
)
3402 mutex_lock(&sessions_mutex
);
3403 list_del(&transport
->node
);
3404 mutex_unlock(&sessions_mutex
);
3406 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
3408 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
3410 enum cpuhp_state lttng_hp_prepare
;
3411 enum cpuhp_state lttng_hp_online
;
3413 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
3415 struct lttng_cpuhp_node
*lttng_node
;
3417 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3418 switch (lttng_node
->component
) {
3419 case LTTNG_RING_BUFFER_FRONTEND
:
3421 case LTTNG_RING_BUFFER_BACKEND
:
3422 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
3423 case LTTNG_RING_BUFFER_ITER
:
3425 case LTTNG_CONTEXT_PERF_COUNTERS
:
3432 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
3434 struct lttng_cpuhp_node
*lttng_node
;
3436 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3437 switch (lttng_node
->component
) {
3438 case LTTNG_RING_BUFFER_FRONTEND
:
3439 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
3440 case LTTNG_RING_BUFFER_BACKEND
:
3442 case LTTNG_RING_BUFFER_ITER
:
3444 case LTTNG_CONTEXT_PERF_COUNTERS
:
3445 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
3451 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
3453 struct lttng_cpuhp_node
*lttng_node
;
3455 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3456 switch (lttng_node
->component
) {
3457 case LTTNG_RING_BUFFER_FRONTEND
:
3458 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
3459 case LTTNG_RING_BUFFER_BACKEND
:
3461 case LTTNG_RING_BUFFER_ITER
:
3462 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
3463 case LTTNG_CONTEXT_PERF_COUNTERS
:
3464 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
3470 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
3472 struct lttng_cpuhp_node
*lttng_node
;
3474 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
3475 switch (lttng_node
->component
) {
3476 case LTTNG_RING_BUFFER_FRONTEND
:
3477 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
3478 case LTTNG_RING_BUFFER_BACKEND
:
3480 case LTTNG_RING_BUFFER_ITER
:
3482 case LTTNG_CONTEXT_PERF_COUNTERS
:
3489 static int __init
lttng_init_cpu_hotplug(void)
3493 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
3494 lttng_hotplug_prepare
,
3495 lttng_hotplug_dead
);
3499 lttng_hp_prepare
= ret
;
3500 lttng_rb_set_hp_prepare(ret
);
3502 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
3503 lttng_hotplug_online
,
3504 lttng_hotplug_offline
);
3506 cpuhp_remove_multi_state(lttng_hp_prepare
);
3507 lttng_hp_prepare
= 0;
3510 lttng_hp_online
= ret
;
3511 lttng_rb_set_hp_online(ret
);
3516 static void __exit
lttng_exit_cpu_hotplug(void)
3518 lttng_rb_set_hp_online(0);
3519 cpuhp_remove_multi_state(lttng_hp_online
);
3520 lttng_rb_set_hp_prepare(0);
3521 cpuhp_remove_multi_state(lttng_hp_prepare
);
3524 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
3525 static int lttng_init_cpu_hotplug(void)
3529 static void lttng_exit_cpu_hotplug(void)
3532 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
3535 static int __init
lttng_events_init(void)
3539 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
3542 ret
= wrapper_get_pfnblock_flags_mask_init();
3545 ret
= wrapper_get_pageblock_flags_mask_init();
3548 ret
= lttng_probes_init();
3551 ret
= lttng_context_init();
3554 ret
= lttng_tracepoint_init();
3557 event_cache
= KMEM_CACHE(lttng_event
, 0);
3560 goto error_kmem_event
;
3562 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
3563 if (!event_notifier_cache
) {
3565 goto error_kmem_event_notifier
;
3567 ret
= lttng_abi_init();
3570 ret
= lttng_logger_init();
3573 ret
= lttng_init_cpu_hotplug();
3576 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
3577 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3578 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3579 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3580 LTTNG_MODULES_EXTRAVERSION
,
3582 #ifdef LTTNG_EXTRA_VERSION_GIT
3583 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3587 #ifdef LTTNG_EXTRA_VERSION_NAME
3588 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3595 lttng_logger_exit();
3599 kmem_cache_destroy(event_notifier_cache
);
3600 error_kmem_event_notifier
:
3601 kmem_cache_destroy(event_cache
);
3603 lttng_tracepoint_exit();
3605 lttng_context_exit();
3606 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
3607 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3608 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3609 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3610 LTTNG_MODULES_EXTRAVERSION
,
3612 #ifdef LTTNG_EXTRA_VERSION_GIT
3613 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3617 #ifdef LTTNG_EXTRA_VERSION_NAME
3618 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3625 module_init(lttng_events_init
);
3627 static void __exit
lttng_events_exit(void)
3629 struct lttng_session
*session
, *tmpsession
;
3631 lttng_exit_cpu_hotplug();
3632 lttng_logger_exit();
3634 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
3635 lttng_session_destroy(session
);
3636 kmem_cache_destroy(event_cache
);
3637 kmem_cache_destroy(event_notifier_cache
);
3638 lttng_tracepoint_exit();
3639 lttng_context_exit();
3640 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
3641 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
3642 __stringify(LTTNG_MODULES_MINOR_VERSION
),
3643 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
3644 LTTNG_MODULES_EXTRAVERSION
,
3646 #ifdef LTTNG_EXTRA_VERSION_GIT
3647 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
3651 #ifdef LTTNG_EXTRA_VERSION_NAME
3652 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
3658 module_exit(lttng_events_exit
);
3660 #include <generated/patches.h>
3661 #ifdef LTTNG_EXTRA_VERSION_GIT
3662 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
3664 #ifdef LTTNG_EXTRA_VERSION_NAME
3665 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
3667 MODULE_LICENSE("GPL and additional rights");
3668 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3669 MODULE_DESCRIPTION("LTTng tracer");
3670 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
3671 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
3672 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
3673 LTTNG_MODULES_EXTRAVERSION
);