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/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.h>
40 #include <lttng/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.h>
50 #include <wrapper/time.h>
52 #define METADATA_CACHE_DEFAULT_SIZE 4096
54 static LIST_HEAD(sessions
);
55 static LIST_HEAD(event_notifier_groups
);
56 static LIST_HEAD(lttng_transport_list
);
57 static LIST_HEAD(lttng_counter_transport_list
);
59 * Protect the sessions and metadata caches.
61 static DEFINE_MUTEX(sessions_mutex
);
62 static struct kmem_cache
*event_recorder_cache
;
63 static struct kmem_cache
*event_recorder_private_cache
;
64 static struct kmem_cache
*event_notifier_cache
;
65 static struct kmem_cache
*event_notifier_private_cache
;
67 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
68 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
69 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
70 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
76 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
);
78 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
80 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
82 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
83 const struct lttng_kernel_type_common
*type
,
84 enum lttng_kernel_string_encoding parent_encoding
,
87 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
88 const struct lttng_kernel_event_field
*field
,
89 size_t nesting
, const char **prev_field_name_p
);
91 void synchronize_trace(void)
93 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
94 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
100 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
101 #ifdef CONFIG_PREEMPT_RT_FULL
104 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
105 #ifdef CONFIG_PREEMPT_RT
108 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
111 void lttng_lock_sessions(void)
113 mutex_lock(&sessions_mutex
);
116 void lttng_unlock_sessions(void)
118 mutex_unlock(&sessions_mutex
);
121 static struct lttng_transport
*lttng_transport_find(const char *name
)
123 struct lttng_transport
*transport
;
125 list_for_each_entry(transport
, <tng_transport_list
, node
) {
126 if (!strcmp(transport
->name
, name
))
133 * Called with sessions lock held.
135 int lttng_session_active(void)
137 struct lttng_kernel_session_private
*iter
;
139 list_for_each_entry(iter
, &sessions
, list
) {
140 if (iter
->pub
->active
)
146 struct lttng_kernel_session
*lttng_session_create(void)
148 struct lttng_kernel_session
*session
;
149 struct lttng_kernel_session_private
*session_priv
;
150 struct lttng_metadata_cache
*metadata_cache
;
153 mutex_lock(&sessions_mutex
);
154 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
157 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
159 goto err_free_session
;
160 session
->priv
= session_priv
;
161 session_priv
->pub
= session
;
163 INIT_LIST_HEAD(&session_priv
->chan
);
164 INIT_LIST_HEAD(&session_priv
->events
);
165 lttng_guid_gen(&session_priv
->uuid
);
167 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
170 goto err_free_session_private
;
171 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
172 if (!metadata_cache
->data
)
174 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
175 kref_init(&metadata_cache
->refcount
);
176 mutex_init(&metadata_cache
->lock
);
177 session_priv
->metadata_cache
= metadata_cache
;
178 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
179 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
180 sizeof(metadata_cache
->uuid
));
181 INIT_LIST_HEAD(&session_priv
->enablers_head
);
182 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
183 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
184 list_add(&session_priv
->list
, &sessions
);
186 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
187 goto tracker_alloc_error
;
188 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
189 goto tracker_alloc_error
;
190 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
195 goto tracker_alloc_error
;
196 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
197 goto tracker_alloc_error
;
199 mutex_unlock(&sessions_mutex
);
204 lttng_id_tracker_fini(&session
->pid_tracker
);
205 lttng_id_tracker_fini(&session
->vpid_tracker
);
206 lttng_id_tracker_fini(&session
->uid_tracker
);
207 lttng_id_tracker_fini(&session
->vuid_tracker
);
208 lttng_id_tracker_fini(&session
->gid_tracker
);
209 lttng_id_tracker_fini(&session
->vgid_tracker
);
211 kfree(metadata_cache
);
212 err_free_session_private
:
213 lttng_kvfree(session_priv
);
215 lttng_kvfree(session
);
217 mutex_unlock(&sessions_mutex
);
222 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
224 struct lttng_counter_transport
*transport
;
226 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
227 if (!strcmp(transport
->name
, name
))
233 struct lttng_counter
*lttng_kernel_counter_create(
234 const char *counter_transport_name
,
235 size_t number_dimensions
, const size_t *dimensions_sizes
)
237 struct lttng_counter
*counter
= NULL
;
238 struct lttng_counter_transport
*counter_transport
= NULL
;
240 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
241 if (!counter_transport
) {
242 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
243 counter_transport_name
);
246 if (!try_module_get(counter_transport
->owner
)) {
247 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
251 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
255 /* Create event notifier error counter. */
256 counter
->ops
= &counter_transport
->ops
;
257 counter
->transport
= counter_transport
;
259 counter
->counter
= counter
->ops
->counter_create(
260 number_dimensions
, dimensions_sizes
, 0);
261 if (!counter
->counter
) {
268 lttng_kvfree(counter
);
270 if (counter_transport
)
271 module_put(counter_transport
->owner
);
276 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
278 struct lttng_transport
*transport
= NULL
;
279 struct lttng_event_notifier_group
*event_notifier_group
;
280 const char *transport_name
= "relay-event-notifier";
281 size_t subbuf_size
= 4096; //TODO
282 size_t num_subbuf
= 16; //TODO
283 unsigned int switch_timer_interval
= 0;
284 unsigned int read_timer_interval
= 0;
287 mutex_lock(&sessions_mutex
);
289 transport
= lttng_transport_find(transport_name
);
291 printk(KERN_WARNING
"LTTng: transport %s not found\n",
295 if (!try_module_get(transport
->owner
)) {
296 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
301 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
303 if (!event_notifier_group
)
307 * Initialize the ring buffer used to store event notifier
310 event_notifier_group
->ops
= &transport
->ops
;
311 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
312 transport_name
, event_notifier_group
, NULL
,
313 subbuf_size
, num_subbuf
, switch_timer_interval
,
314 read_timer_interval
);
315 if (!event_notifier_group
->chan
)
318 event_notifier_group
->transport
= transport
;
320 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
321 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
322 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
323 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
325 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
327 mutex_unlock(&sessions_mutex
);
329 return event_notifier_group
;
332 lttng_kvfree(event_notifier_group
);
335 module_put(transport
->owner
);
337 mutex_unlock(&sessions_mutex
);
341 void metadata_cache_destroy(struct kref
*kref
)
343 struct lttng_metadata_cache
*cache
=
344 container_of(kref
, struct lttng_metadata_cache
, refcount
);
349 void lttng_session_destroy(struct lttng_kernel_session
*session
)
351 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
352 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
353 struct lttng_metadata_stream
*metadata_stream
;
354 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
357 mutex_lock(&sessions_mutex
);
358 WRITE_ONCE(session
->active
, 0);
359 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
360 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
363 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
364 ret
= _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
367 synchronize_trace(); /* Wait for in-flight events to complete */
368 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
369 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
372 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
373 lttng_event_enabler_destroy(event_enabler
);
374 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
375 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
376 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
377 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
378 _lttng_channel_destroy(chan_priv
->pub
);
380 mutex_lock(&session
->priv
->metadata_cache
->lock
);
381 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
382 _lttng_metadata_channel_hangup(metadata_stream
);
383 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
384 lttng_id_tracker_fini(&session
->pid_tracker
);
385 lttng_id_tracker_fini(&session
->vpid_tracker
);
386 lttng_id_tracker_fini(&session
->uid_tracker
);
387 lttng_id_tracker_fini(&session
->vuid_tracker
);
388 lttng_id_tracker_fini(&session
->gid_tracker
);
389 lttng_id_tracker_fini(&session
->vgid_tracker
);
390 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
391 list_del(&session
->priv
->list
);
392 mutex_unlock(&sessions_mutex
);
393 lttng_kvfree(session
->priv
);
394 lttng_kvfree(session
);
397 void lttng_event_notifier_group_destroy(
398 struct lttng_event_notifier_group
*event_notifier_group
)
400 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
401 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
404 if (!event_notifier_group
)
407 mutex_lock(&sessions_mutex
);
409 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
412 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
413 &event_notifier_group
->event_notifiers_head
, parent
.node
) {
414 ret
= _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
418 /* Wait for in-flight event notifier to complete */
421 irq_work_sync(&event_notifier_group
->wakeup_pending
);
423 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
426 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
427 &event_notifier_group
->enablers_head
, node
)
428 lttng_event_enabler_destroy(event_enabler
);
430 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
431 &event_notifier_group
->event_notifiers_head
, parent
.node
)
432 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
434 if (event_notifier_group
->error_counter
) {
435 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
437 error_counter
->ops
->counter_destroy(error_counter
->counter
);
438 module_put(error_counter
->transport
->owner
);
439 lttng_kvfree(error_counter
);
440 event_notifier_group
->error_counter
= NULL
;
443 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
444 module_put(event_notifier_group
->transport
->owner
);
445 list_del(&event_notifier_group
->node
);
447 mutex_unlock(&sessions_mutex
);
448 lttng_kvfree(event_notifier_group
);
451 int lttng_session_statedump(struct lttng_kernel_session
*session
)
455 mutex_lock(&sessions_mutex
);
456 ret
= lttng_statedump_start(session
);
457 mutex_unlock(&sessions_mutex
);
461 int lttng_session_enable(struct lttng_kernel_session
*session
)
464 struct lttng_kernel_channel_buffer_private
*chan_priv
;
466 mutex_lock(&sessions_mutex
);
467 if (session
->active
) {
472 /* Set transient enabler state to "enabled" */
473 session
->priv
->tstate
= 1;
475 /* We need to sync enablers with session before activation. */
476 lttng_session_sync_event_enablers(session
);
479 * Snapshot the number of events per channel to know the type of header
482 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
483 if (chan_priv
->header_type
)
484 continue; /* don't change it if session stop/restart */
485 if (chan_priv
->free_event_id
< 31)
486 chan_priv
->header_type
= 1; /* compact */
488 chan_priv
->header_type
= 2; /* large */
491 /* Clear each stream's quiescent state. */
492 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
493 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
494 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
497 WRITE_ONCE(session
->active
, 1);
498 WRITE_ONCE(session
->priv
->been_active
, 1);
499 ret
= _lttng_session_metadata_statedump(session
);
501 WRITE_ONCE(session
->active
, 0);
504 ret
= lttng_statedump_start(session
);
506 WRITE_ONCE(session
->active
, 0);
508 mutex_unlock(&sessions_mutex
);
512 int lttng_session_disable(struct lttng_kernel_session
*session
)
515 struct lttng_kernel_channel_buffer_private
*chan_priv
;
517 mutex_lock(&sessions_mutex
);
518 if (!session
->active
) {
522 WRITE_ONCE(session
->active
, 0);
524 /* Set transient enabler state to "disabled" */
525 session
->priv
->tstate
= 0;
526 lttng_session_sync_event_enablers(session
);
528 /* Set each stream's quiescent state. */
529 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
530 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
531 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
534 mutex_unlock(&sessions_mutex
);
538 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
541 struct lttng_kernel_channel_buffer_private
*chan_priv
;
542 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
543 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
544 struct lttng_metadata_stream
*stream
;
546 mutex_lock(&sessions_mutex
);
547 if (!session
->active
) {
552 mutex_lock(&cache
->lock
);
553 memset(cache
->data
, 0, cache
->cache_alloc
);
554 cache
->metadata_written
= 0;
556 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
557 stream
->metadata_out
= 0;
558 stream
->metadata_in
= 0;
560 mutex_unlock(&cache
->lock
);
562 session
->priv
->metadata_dumped
= 0;
563 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
564 chan_priv
->metadata_dumped
= 0;
567 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
568 event_recorder_priv
->metadata_dumped
= 0;
571 ret
= _lttng_session_metadata_statedump(session
);
574 mutex_unlock(&sessions_mutex
);
579 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
581 struct lttng_kernel_channel_buffer
*chan_buf
;
583 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
585 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
586 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
591 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
595 mutex_lock(&sessions_mutex
);
596 if (is_channel_buffer_metadata(channel
)) {
600 if (channel
->enabled
) {
604 /* Set transient enabler state to "enabled" */
605 channel
->priv
->tstate
= 1;
606 lttng_session_sync_event_enablers(channel
->session
);
607 /* Set atomically the state to "enabled" */
608 WRITE_ONCE(channel
->enabled
, 1);
610 mutex_unlock(&sessions_mutex
);
614 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
618 mutex_lock(&sessions_mutex
);
619 if (is_channel_buffer_metadata(channel
)) {
623 if (!channel
->enabled
) {
627 /* Set atomically the state to "disabled" */
628 WRITE_ONCE(channel
->enabled
, 0);
629 /* Set transient enabler state to "enabled" */
630 channel
->priv
->tstate
= 0;
631 lttng_session_sync_event_enablers(channel
->session
);
633 mutex_unlock(&sessions_mutex
);
637 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
641 mutex_lock(&sessions_mutex
);
642 switch (event
->type
) {
643 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
645 struct lttng_kernel_event_recorder
*event_recorder
=
646 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
648 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
654 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
655 switch (event
->priv
->instrumentation
) {
656 case LTTNG_KERNEL_ABI_KRETPROBE
:
667 if (event
->enabled
) {
671 switch (event
->priv
->instrumentation
) {
672 case LTTNG_KERNEL_ABI_TRACEPOINT
:
674 case LTTNG_KERNEL_ABI_SYSCALL
:
678 case LTTNG_KERNEL_ABI_KPROBE
:
680 case LTTNG_KERNEL_ABI_UPROBE
:
681 WRITE_ONCE(event
->enabled
, 1);
684 case LTTNG_KERNEL_ABI_KRETPROBE
:
685 ret
= lttng_kretprobes_event_enable_state(event
, 1);
688 case LTTNG_KERNEL_ABI_FUNCTION
:
690 case LTTNG_KERNEL_ABI_NOOP
:
697 mutex_unlock(&sessions_mutex
);
701 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
705 mutex_lock(&sessions_mutex
);
706 switch (event
->type
) {
707 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
709 struct lttng_kernel_event_recorder
*event_recorder
=
710 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
712 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
718 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
719 switch (event
->priv
->instrumentation
) {
720 case LTTNG_KERNEL_ABI_KRETPROBE
:
731 if (!event
->enabled
) {
735 switch (event
->priv
->instrumentation
) {
736 case LTTNG_KERNEL_ABI_TRACEPOINT
:
738 case LTTNG_KERNEL_ABI_SYSCALL
:
742 case LTTNG_KERNEL_ABI_KPROBE
:
744 case LTTNG_KERNEL_ABI_UPROBE
:
745 WRITE_ONCE(event
->enabled
, 0);
748 case LTTNG_KERNEL_ABI_KRETPROBE
:
749 ret
= lttng_kretprobes_event_enable_state(event
, 0);
752 case LTTNG_KERNEL_ABI_FUNCTION
:
754 case LTTNG_KERNEL_ABI_NOOP
:
761 mutex_unlock(&sessions_mutex
);
765 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
766 const char *transport_name
,
768 size_t subbuf_size
, size_t num_subbuf
,
769 unsigned int switch_timer_interval
,
770 unsigned int read_timer_interval
,
771 enum channel_type channel_type
)
773 struct lttng_kernel_channel_buffer
*chan
;
774 struct lttng_kernel_channel_buffer_private
*chan_priv
;
775 struct lttng_transport
*transport
= NULL
;
777 mutex_lock(&sessions_mutex
);
778 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
779 goto active
; /* Refuse to add channel to active session */
780 transport
= lttng_transport_find(transport_name
);
782 printk(KERN_WARNING
"LTTng: transport %s not found\n",
786 if (!try_module_get(transport
->owner
)) {
787 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
790 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
793 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
796 chan
->priv
= chan_priv
;
797 chan_priv
->pub
= chan
;
798 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
799 chan
->parent
.session
= session
;
800 chan
->priv
->id
= session
->priv
->free_chan_id
++;
801 chan
->ops
= &transport
->ops
;
803 * Note: the channel creation op already writes into the packet
804 * headers. Therefore the "chan" information used as input
805 * should be already accessible.
807 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
808 chan
, buf_addr
, subbuf_size
, num_subbuf
,
809 switch_timer_interval
, read_timer_interval
);
810 if (!chan
->priv
->rb_chan
)
812 chan
->priv
->parent
.tstate
= 1;
813 chan
->parent
.enabled
= 1;
814 chan
->priv
->transport
= transport
;
815 chan
->priv
->channel_type
= channel_type
;
816 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
817 mutex_unlock(&sessions_mutex
);
826 module_put(transport
->owner
);
829 mutex_unlock(&sessions_mutex
);
834 * Only used internally at session destruction for per-cpu channels, and
835 * when metadata channel is released.
836 * Needs to be called with sessions mutex held.
839 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
841 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
842 module_put(chan
->priv
->transport
->owner
);
843 list_del(&chan
->priv
->node
);
844 lttng_kernel_destroy_context(chan
->priv
->ctx
);
849 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
851 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
853 /* Protect the metadata cache with the sessions_mutex. */
854 mutex_lock(&sessions_mutex
);
855 _lttng_channel_destroy(chan
);
856 mutex_unlock(&sessions_mutex
);
858 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
861 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
863 stream
->finalized
= 1;
864 wake_up_interruptible(&stream
->read_wait
);
868 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
870 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
871 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
873 switch (event_enabler
->enabler_type
) {
874 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
876 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
877 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
878 struct lttng_kernel_event_recorder
*event_recorder
;
879 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
880 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
882 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
885 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
886 if (!event_recorder_priv
) {
887 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
890 event_recorder_priv
->pub
= event_recorder
;
891 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
892 event_recorder
->priv
= event_recorder_priv
;
893 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
895 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
896 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
897 event_recorder
->priv
->parent
.instrumentation
= itype
;
898 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
899 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
901 event_recorder
->chan
= chan
;
902 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
903 return &event_recorder
->parent
;
905 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
907 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
908 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
909 struct lttng_kernel_event_notifier
*event_notifier
;
910 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
912 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
915 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
916 if (!event_notifier_priv
) {
917 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
920 event_notifier_priv
->pub
= event_notifier
;
921 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
922 event_notifier
->priv
= event_notifier_priv
;
923 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
925 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
926 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
927 event_notifier
->priv
->parent
.instrumentation
= itype
;
928 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
929 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
930 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
932 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
933 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
934 event_notifier
->priv
->num_captures
= 0;
935 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
936 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
937 return &event_notifier
->parent
;
945 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
947 switch (event
->type
) {
948 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
950 struct lttng_kernel_event_recorder
*event_recorder
=
951 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
953 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
954 kmem_cache_free(event_recorder_cache
, event_recorder
);
957 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
959 struct lttng_kernel_event_notifier
*event_notifier
=
960 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
962 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
963 kmem_cache_free(event_notifier_cache
, event_notifier
);
972 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
974 switch (event
->type
) {
975 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
977 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
979 struct lttng_kernel_event_notifier
*event_notifier
=
980 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
981 struct lttng_counter
*error_counter
;
982 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
983 size_t dimension_index
[1];
987 * Clear the error counter bucket. The sessiond keeps track of which
988 * bucket is currently in use. We trust it. The session lock
989 * synchronizes against concurrent creation of the error
992 error_counter
= event_notifier_group
->error_counter
;
996 * Check that the index is within the boundary of the counter.
998 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
999 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1000 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1004 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1005 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1007 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1008 event_notifier
->priv
->error_counter_index
);
1019 * Supports event creation while tracing session is active.
1020 * Needs to be called with sessions mutex held.
1023 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
1024 const struct lttng_kernel_event_desc
*event_desc
)
1026 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1027 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1028 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
1029 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1030 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1031 struct lttng_kernel_event_common_private
*event_priv
;
1032 struct lttng_kernel_event_common
*event
;
1033 struct lttng_kernel_event_recorder
*event_recorder
;
1034 const char *event_name
;
1035 struct hlist_head
*head
;
1038 if (chan
->priv
->free_event_id
== -1U) {
1044 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1045 event_name
= event_desc
->event_name
;
1048 case LTTNG_KERNEL_ABI_KPROBE
:
1050 case LTTNG_KERNEL_ABI_UPROBE
:
1052 case LTTNG_KERNEL_ABI_KRETPROBE
:
1054 case LTTNG_KERNEL_ABI_SYSCALL
:
1055 event_name
= event_param
->name
;
1058 case LTTNG_KERNEL_ABI_FUNCTION
:
1060 case LTTNG_KERNEL_ABI_NOOP
:
1068 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1069 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1070 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1076 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1081 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1084 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1085 /* Event will be enabled by enabler sync. */
1087 event
->priv
->registered
= 0;
1088 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1089 if (!event
->priv
->desc
) {
1091 goto register_error
;
1093 /* Populate lttng_event structure before event registration. */
1097 case LTTNG_KERNEL_ABI_KPROBE
:
1099 * Needs to be explicitly enabled after creation, since
1100 * we may want to apply filters.
1103 event
->priv
->registered
= 1;
1105 * Populate lttng_event structure before event
1109 ret
= lttng_kprobes_register_event(event_name
,
1110 event_param
->u
.kprobe
.symbol_name
,
1111 event_param
->u
.kprobe
.offset
,
1112 event_param
->u
.kprobe
.addr
,
1116 goto register_error
;
1118 ret
= try_module_get(event
->priv
->desc
->owner
);
1122 case LTTNG_KERNEL_ABI_KRETPROBE
:
1124 struct lttng_kernel_event_common
*event_return
;
1126 /* kretprobe defines 2 events */
1128 * Needs to be explicitly enabled after creation, since
1129 * we may want to apply filters.
1132 event
->priv
->registered
= 1;
1134 event_return
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1140 event_return
->enabled
= 0;
1141 event_return
->priv
->registered
= 1;
1144 * Populate lttng_event structure before kretprobe registration.
1147 ret
= lttng_kretprobes_register(event_name
,
1148 event_param
->u
.kretprobe
.symbol_name
,
1149 event_param
->u
.kretprobe
.offset
,
1150 event_param
->u
.kretprobe
.addr
,
1151 event
, event_return
);
1153 lttng_kernel_event_free(event_return
);
1155 goto register_error
;
1157 /* Take 2 refs on the module: one per event. */
1158 ret
= try_module_get(event
->priv
->desc
->owner
);
1160 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1162 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1163 WARN_ON_ONCE(ret
> 0);
1165 lttng_kernel_event_free(event_return
);
1166 module_put(event_return
->priv
->desc
->owner
);
1167 module_put(event
->priv
->desc
->owner
);
1168 goto statedump_error
;
1170 list_add(&event_return
->priv
->node
, event_list_head
);
1174 case LTTNG_KERNEL_ABI_SYSCALL
:
1176 * Needs to be explicitly enabled after creation, since
1177 * we may want to apply filters.
1180 event
->priv
->registered
= 0;
1181 event
->priv
->desc
= event_desc
;
1182 switch (event_param
->u
.syscall
.entryexit
) {
1183 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1185 goto register_error
;
1186 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1187 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1189 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1190 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1193 switch (event_param
->u
.syscall
.abi
) {
1194 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1196 goto register_error
;
1197 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1198 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1200 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1201 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1204 if (!event
->priv
->desc
) {
1206 goto register_error
;
1210 case LTTNG_KERNEL_ABI_UPROBE
:
1212 * Needs to be explicitly enabled after creation, since
1213 * we may want to apply filters.
1216 event
->priv
->registered
= 1;
1219 * Populate lttng_event structure before event
1224 ret
= lttng_uprobes_register_event(event_param
->name
,
1225 event_param
->u
.uprobe
.fd
,
1228 goto register_error
;
1229 ret
= try_module_get(event
->priv
->desc
->owner
);
1233 case LTTNG_KERNEL_ABI_FUNCTION
:
1235 case LTTNG_KERNEL_ABI_NOOP
:
1240 goto register_error
;
1242 ret
= _lttng_event_recorder_metadata_statedump(event
);
1243 WARN_ON_ONCE(ret
> 0);
1245 goto statedump_error
;
1247 hlist_add_head(&event
->priv
->hlist_node
, head
);
1248 list_add(&event
->priv
->node
, event_list_head
);
1249 return event_recorder
;
1252 /* If a statedump error occurs, events will not be readable. */
1254 lttng_kernel_event_free(event
);
1259 return ERR_PTR(ret
);
1263 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1264 const struct lttng_kernel_event_desc
*event_desc
)
1266 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1267 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1268 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1269 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1270 struct lttng_kernel_event_common_private
*event_priv
;
1271 struct lttng_kernel_event_common
*event
;
1272 struct lttng_kernel_event_notifier
*event_notifier
;
1273 const char *event_name
;
1274 struct hlist_head
*head
;
1278 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1279 event_name
= event_desc
->event_name
;
1282 case LTTNG_KERNEL_ABI_KPROBE
:
1284 case LTTNG_KERNEL_ABI_UPROBE
:
1286 case LTTNG_KERNEL_ABI_SYSCALL
:
1287 event_name
= event_param
->name
;
1290 case LTTNG_KERNEL_ABI_KRETPROBE
:
1292 case LTTNG_KERNEL_ABI_FUNCTION
:
1294 case LTTNG_KERNEL_ABI_NOOP
:
1302 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1303 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1304 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1310 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1315 event_notifier
= container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1318 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1319 /* Event will be enabled by enabler sync. */
1321 event
->priv
->registered
= 0;
1322 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1323 if (!event
->priv
->desc
) {
1325 goto register_error
;
1327 /* Populate lttng_event_notifier structure before event registration. */
1331 case LTTNG_KERNEL_ABI_KPROBE
:
1333 * Needs to be explicitly enabled after creation, since
1334 * we may want to apply filters.
1337 event
->priv
->registered
= 1;
1339 * Populate lttng_event_notifier structure before event
1343 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1344 event_param
->u
.kprobe
.symbol_name
,
1345 event_param
->u
.kprobe
.offset
,
1346 event_param
->u
.kprobe
.addr
,
1350 goto register_error
;
1352 ret
= try_module_get(event
->priv
->desc
->owner
);
1356 case LTTNG_KERNEL_ABI_SYSCALL
:
1358 * Needs to be explicitly enabled after creation, since
1359 * we may want to apply filters.
1362 event
->priv
->registered
= 0;
1363 event
->priv
->desc
= event_desc
;
1364 switch (event_param
->u
.syscall
.entryexit
) {
1365 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1367 goto register_error
;
1368 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1369 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1371 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1372 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1375 switch (event_param
->u
.syscall
.abi
) {
1376 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1378 goto register_error
;
1379 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1380 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1382 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1383 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1387 if (!event
->priv
->desc
) {
1389 goto register_error
;
1393 case LTTNG_KERNEL_ABI_UPROBE
:
1395 * Needs to be explicitly enabled after creation, since
1396 * we may want to apply filters.
1399 event
->priv
->registered
= 1;
1402 * Populate lttng_event_notifier structure before
1403 * event_notifier registration.
1407 ret
= lttng_uprobes_register_event(event_param
->name
,
1408 event_param
->u
.uprobe
.fd
,
1411 goto register_error
;
1412 ret
= try_module_get(event
->priv
->desc
->owner
);
1416 case LTTNG_KERNEL_ABI_KRETPROBE
:
1418 case LTTNG_KERNEL_ABI_FUNCTION
:
1420 case LTTNG_KERNEL_ABI_NOOP
:
1425 goto register_error
;
1428 list_add(&event
->priv
->node
, event_list_head
);
1429 hlist_add_head(&event
->priv
->hlist_node
, head
);
1431 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1433 goto register_error
;
1434 return event_notifier
;
1437 lttng_kernel_event_free(event
);
1441 return ERR_PTR(ret
);
1444 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1445 const struct lttng_kernel_event_desc
*event_desc
)
1447 switch (event_enabler
->enabler_type
) {
1448 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1450 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1451 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1452 struct lttng_kernel_event_recorder
*event_recorder
;
1454 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1455 if (!event_recorder
)
1457 return &event_recorder
->parent
;
1459 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1461 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1462 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1463 struct lttng_kernel_event_notifier
*event_notifier
;
1465 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1466 if (!event_notifier
)
1468 return &event_notifier
->parent
;
1475 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1476 const struct lttng_kernel_event_desc
*event_desc
)
1478 struct lttng_kernel_event_common
*event
;
1480 mutex_lock(&sessions_mutex
);
1481 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1482 mutex_unlock(&sessions_mutex
);
1488 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1489 const size_t *dim_indexes
, int32_t cpu
,
1490 int64_t *val
, bool *overflow
, bool *underflow
)
1492 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1493 cpu
, val
, overflow
, underflow
);
1496 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1497 const size_t *dim_indexes
, int64_t *val
,
1498 bool *overflow
, bool *underflow
)
1500 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1501 val
, overflow
, underflow
);
1504 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1505 const size_t *dim_indexes
)
1507 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1510 /* Only used for tracepoints for now. */
1512 void register_event(struct lttng_kernel_event_common
*event
)
1514 const struct lttng_kernel_event_desc
*desc
;
1517 if (event
->priv
->registered
)
1520 desc
= event
->priv
->desc
;
1521 switch (event
->priv
->instrumentation
) {
1522 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1523 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1524 desc
->tp_class
->probe_callback
,
1528 case LTTNG_KERNEL_ABI_SYSCALL
:
1529 ret
= lttng_syscall_filter_enable_event(event
);
1532 case LTTNG_KERNEL_ABI_KPROBE
:
1534 case LTTNG_KERNEL_ABI_UPROBE
:
1538 case LTTNG_KERNEL_ABI_KRETPROBE
:
1539 switch (event
->type
) {
1540 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1543 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1549 case LTTNG_KERNEL_ABI_FUNCTION
:
1551 case LTTNG_KERNEL_ABI_NOOP
:
1557 event
->priv
->registered
= 1;
1560 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1562 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1563 const struct lttng_kernel_event_desc
*desc
;
1566 if (!event_priv
->registered
)
1569 desc
= event_priv
->desc
;
1570 switch (event_priv
->instrumentation
) {
1571 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1572 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1573 event_priv
->desc
->tp_class
->probe_callback
,
1577 case LTTNG_KERNEL_ABI_KPROBE
:
1578 lttng_kprobes_unregister_event(event
);
1582 case LTTNG_KERNEL_ABI_KRETPROBE
:
1583 switch (event
->type
) {
1584 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1585 lttng_kretprobes_unregister(event
);
1588 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1594 case LTTNG_KERNEL_ABI_SYSCALL
:
1595 ret
= lttng_syscall_filter_disable_event(event
);
1598 case LTTNG_KERNEL_ABI_NOOP
:
1599 switch (event
->type
) {
1600 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1603 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1609 case LTTNG_KERNEL_ABI_UPROBE
:
1610 lttng_uprobes_unregister_event(event
);
1614 case LTTNG_KERNEL_ABI_FUNCTION
:
1620 event_priv
->registered
= 0;
1625 * Only used internally at session destruction.
1628 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1630 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1631 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1633 lttng_free_event_filter_runtime(event
);
1634 /* Free event enabler refs */
1635 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1636 &event_priv
->enablers_ref_head
, node
)
1639 switch (event
->type
) {
1640 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1642 struct lttng_kernel_event_recorder
*event_recorder
=
1643 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1645 switch (event_priv
->instrumentation
) {
1646 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1647 lttng_event_desc_put(event_priv
->desc
);
1650 case LTTNG_KERNEL_ABI_KPROBE
:
1651 module_put(event_priv
->desc
->owner
);
1652 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1655 case LTTNG_KERNEL_ABI_KRETPROBE
:
1656 module_put(event_priv
->desc
->owner
);
1657 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1660 case LTTNG_KERNEL_ABI_SYSCALL
:
1663 case LTTNG_KERNEL_ABI_UPROBE
:
1664 module_put(event_priv
->desc
->owner
);
1665 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1668 case LTTNG_KERNEL_ABI_FUNCTION
:
1670 case LTTNG_KERNEL_ABI_NOOP
:
1675 list_del(&event_recorder
->priv
->parent
.node
);
1676 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1677 kmem_cache_free(event_recorder_cache
, event_recorder
);
1680 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1682 struct lttng_kernel_event_notifier
*event_notifier
=
1683 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1685 switch (event_notifier
->priv
->parent
.instrumentation
) {
1686 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1687 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1690 case LTTNG_KERNEL_ABI_KPROBE
:
1691 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1692 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1695 case LTTNG_KERNEL_ABI_SYSCALL
:
1698 case LTTNG_KERNEL_ABI_UPROBE
:
1699 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1700 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1703 case LTTNG_KERNEL_ABI_KRETPROBE
:
1705 case LTTNG_KERNEL_ABI_FUNCTION
:
1707 case LTTNG_KERNEL_ABI_NOOP
:
1712 list_del(&event_notifier
->priv
->parent
.node
);
1713 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1714 kmem_cache_free(event_notifier_cache
, event_notifier
);
1722 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1723 enum tracker_type tracker_type
)
1725 switch (tracker_type
) {
1727 return &session
->pid_tracker
;
1729 return &session
->vpid_tracker
;
1731 return &session
->uid_tracker
;
1733 return &session
->vuid_tracker
;
1735 return &session
->gid_tracker
;
1737 return &session
->vgid_tracker
;
1744 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1745 enum tracker_type tracker_type
, int id
)
1747 struct lttng_kernel_id_tracker
*tracker
;
1750 tracker
= get_tracker(session
, tracker_type
);
1755 mutex_lock(&sessions_mutex
);
1757 /* track all ids: destroy tracker. */
1758 lttng_id_tracker_destroy(tracker
, true);
1761 ret
= lttng_id_tracker_add(tracker
, id
);
1763 mutex_unlock(&sessions_mutex
);
1767 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1768 enum tracker_type tracker_type
, int id
)
1770 struct lttng_kernel_id_tracker
*tracker
;
1773 tracker
= get_tracker(session
, tracker_type
);
1778 mutex_lock(&sessions_mutex
);
1780 /* untrack all ids: replace by empty tracker. */
1781 ret
= lttng_id_tracker_empty_set(tracker
);
1783 ret
= lttng_id_tracker_del(tracker
, id
);
1785 mutex_unlock(&sessions_mutex
);
1790 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1792 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1793 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1794 struct lttng_id_hash_node
*e
;
1797 mutex_lock(&sessions_mutex
);
1799 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1800 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1802 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1808 /* ID tracker disabled. */
1809 if (iter
>= *pos
&& iter
== 0) {
1810 return id_tracker_p
; /* empty tracker */
1818 /* Called with sessions_mutex held. */
1820 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1822 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1823 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1824 struct lttng_id_hash_node
*e
;
1829 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1830 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1832 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1833 if (iter
++ >= *ppos
)
1838 /* ID tracker disabled. */
1839 if (iter
>= *ppos
&& iter
== 0)
1840 return p
; /* empty tracker */
1849 void id_list_stop(struct seq_file
*m
, void *p
)
1851 mutex_unlock(&sessions_mutex
);
1855 int id_list_show(struct seq_file
*m
, void *p
)
1857 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1858 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1861 if (p
== id_tracker_p
) {
1862 /* Tracker disabled. */
1865 const struct lttng_id_hash_node
*e
= p
;
1867 id
= lttng_id_tracker_get_node_id(e
);
1869 switch (id_tracker
->priv
->tracker_type
) {
1871 seq_printf(m
, "process { pid = %d; };\n", id
);
1874 seq_printf(m
, "process { vpid = %d; };\n", id
);
1877 seq_printf(m
, "user { uid = %d; };\n", id
);
1880 seq_printf(m
, "user { vuid = %d; };\n", id
);
1883 seq_printf(m
, "group { gid = %d; };\n", id
);
1886 seq_printf(m
, "group { vgid = %d; };\n", id
);
1889 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1895 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1896 .start
= id_list_start
,
1897 .next
= id_list_next
,
1898 .stop
= id_list_stop
,
1899 .show
= id_list_show
,
1903 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1905 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1909 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1911 struct seq_file
*m
= file
->private_data
;
1912 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1915 WARN_ON_ONCE(!id_tracker
);
1916 ret
= seq_release(inode
, file
);
1918 fput(id_tracker
->priv
->session
->priv
->file
);
1922 const struct file_operations lttng_tracker_ids_list_fops
= {
1923 .owner
= THIS_MODULE
,
1924 .open
= lttng_tracker_ids_list_open
,
1926 .llseek
= seq_lseek
,
1927 .release
= lttng_tracker_ids_list_release
,
1930 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1931 enum tracker_type tracker_type
)
1933 struct file
*tracker_ids_list_file
;
1937 file_fd
= lttng_get_unused_fd();
1943 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1944 <tng_tracker_ids_list_fops
,
1946 if (IS_ERR(tracker_ids_list_file
)) {
1947 ret
= PTR_ERR(tracker_ids_list_file
);
1950 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1952 goto refcount_error
;
1954 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1957 m
= tracker_ids_list_file
->private_data
;
1959 m
->private = get_tracker(session
, tracker_type
);
1960 BUG_ON(!m
->private);
1961 fd_install(file_fd
, tracker_ids_list_file
);
1966 atomic_long_dec(&session
->priv
->file
->f_count
);
1968 fput(tracker_ids_list_file
);
1970 put_unused_fd(file_fd
);
1976 * Enabler management.
1979 int lttng_match_enabler_star_glob(const char *desc_name
,
1980 const char *pattern
)
1982 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1983 desc_name
, LTTNG_SIZE_MAX
))
1989 int lttng_match_enabler_name(const char *desc_name
,
1992 if (strcmp(desc_name
, name
))
1998 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1999 struct lttng_event_enabler_common
*enabler
)
2001 const char *desc_name
, *enabler_name
;
2002 bool compat
= false, entry
= false;
2004 enabler_name
= enabler
->event_param
.name
;
2005 switch (enabler
->event_param
.instrumentation
) {
2006 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2007 desc_name
= desc
->event_name
;
2008 switch (enabler
->format_type
) {
2009 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2010 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2011 case LTTNG_ENABLER_FORMAT_NAME
:
2012 return lttng_match_enabler_name(desc_name
, enabler_name
);
2018 case LTTNG_KERNEL_ABI_SYSCALL
:
2019 desc_name
= desc
->event_name
;
2020 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2021 desc_name
+= strlen("compat_");
2024 if (!strncmp(desc_name
, "syscall_exit_",
2025 strlen("syscall_exit_"))) {
2026 desc_name
+= strlen("syscall_exit_");
2027 } else if (!strncmp(desc_name
, "syscall_entry_",
2028 strlen("syscall_entry_"))) {
2029 desc_name
+= strlen("syscall_entry_");
2035 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2036 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2038 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2042 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2049 switch (enabler
->event_param
.u
.syscall
.abi
) {
2050 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2056 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2063 switch (enabler
->event_param
.u
.syscall
.match
) {
2064 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2065 switch (enabler
->format_type
) {
2066 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2067 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2068 case LTTNG_ENABLER_FORMAT_NAME
:
2069 return lttng_match_enabler_name(desc_name
, enabler_name
);
2074 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2075 return -EINVAL
; /* Not implemented. */
2087 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2088 struct lttng_event_enabler_common
*enabler
)
2092 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2100 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2101 struct lttng_kernel_event_common
*event
)
2103 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2106 switch (event_enabler
->enabler_type
) {
2107 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2109 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2110 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2111 struct lttng_kernel_event_recorder
*event_recorder
=
2112 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2114 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2115 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2120 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2122 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2123 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2124 struct lttng_kernel_event_notifier
*event_notifier
=
2125 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2127 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2128 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2129 && event
->priv
->user_token
== event_enabler
->user_token
)
2140 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2141 const struct lttng_kernel_event_desc
*desc
,
2142 struct lttng_kernel_event_common
*event
)
2144 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2147 switch (event_enabler
->enabler_type
) {
2148 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2150 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2151 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2152 struct lttng_kernel_event_recorder
*event_recorder
=
2153 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2155 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2160 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2162 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2163 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2164 struct lttng_kernel_event_notifier
*event_notifier
=
2165 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2167 if (event
->priv
->desc
== desc
2168 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2169 && event
->priv
->user_token
== event_enabler
->user_token
)
2180 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2181 const char *event_name
,
2182 struct lttng_kernel_event_common
*event
)
2184 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2187 switch (event_enabler
->enabler_type
) {
2188 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2190 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2191 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2192 struct lttng_kernel_event_recorder
*event_recorder
=
2193 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2195 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2196 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2201 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2203 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2204 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2205 struct lttng_kernel_event_notifier
*event_notifier
=
2206 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2208 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2209 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2210 && event
->priv
->user_token
== event_enabler
->user_token
)
2222 struct lttng_enabler_ref
*lttng_enabler_ref(
2223 struct list_head
*enablers_ref_list
,
2224 struct lttng_event_enabler_common
*enabler
)
2226 struct lttng_enabler_ref
*enabler_ref
;
2228 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2229 if (enabler_ref
->ref
== enabler
)
2236 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2238 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2239 struct lttng_kernel_probe_desc
*probe_desc
;
2240 const struct lttng_kernel_event_desc
*desc
;
2241 struct list_head
*probe_list
;
2244 probe_list
= lttng_get_probe_list_head();
2246 * For each probe event, if we find that a probe event matches
2247 * our enabler, create an associated lttng_event if not
2250 list_for_each_entry(probe_desc
, probe_list
, head
) {
2251 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2253 struct hlist_head
*head
;
2254 struct lttng_kernel_event_common
*event
;
2255 struct lttng_kernel_event_common_private
*event_priv
;
2257 desc
= probe_desc
->event_desc
[i
];
2258 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2262 * Check if already created.
2264 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2265 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2266 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2273 * We need to create an event for this event probe.
2275 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2277 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2278 probe_desc
->event_desc
[i
]->event_name
);
2285 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2289 ret
= lttng_syscalls_register_event(event_enabler
);
2294 * Create event if it is missing and present in the list of tracepoint probes.
2295 * Should be called with sessions mutex held.
2298 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2300 switch (event_enabler
->event_param
.instrumentation
) {
2301 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2302 lttng_create_tracepoint_event_if_missing(event_enabler
);
2305 case LTTNG_KERNEL_ABI_SYSCALL
:
2306 lttng_create_syscall_event_if_missing(event_enabler
);
2316 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2317 struct lttng_kernel_event_common
*event
)
2319 /* Link filter bytecodes if not linked yet. */
2320 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2321 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2325 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2326 struct lttng_kernel_event_common
*event
)
2328 switch (event_enabler
->enabler_type
) {
2329 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2331 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2333 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2334 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2335 struct lttng_kernel_event_notifier
*event_notifier
=
2336 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2338 /* Link capture bytecodes if not linked yet. */
2339 lttng_enabler_link_bytecode(event
->priv
->desc
,
2340 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2341 &event_notifier_enabler
->capture_bytecode_head
);
2342 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2351 * Create events associated with an event_enabler (if not already present),
2352 * and add backward reference from the event to the enabler.
2353 * Should be called with sessions mutex held.
2356 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2358 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2359 struct lttng_kernel_event_common_private
*event_priv
;
2361 lttng_syscall_table_set_wildcard_all(event_enabler
);
2363 /* First ensure that probe events are created for this enabler. */
2364 lttng_create_event_if_missing(event_enabler
);
2366 /* Link the created event with its associated enabler. */
2367 list_for_each_entry(event_priv
, event_list_head
, node
) {
2368 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2369 struct lttng_enabler_ref
*enabler_ref
;
2371 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2374 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2377 * If no backward ref, create it.
2378 * Add backward ref from event_notifier to enabler.
2380 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2384 enabler_ref
->ref
= event_enabler
;
2385 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2388 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2389 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2395 * Called at module load: connect the probe on all enablers matching
2397 * Called with sessions lock held.
2399 int lttng_fix_pending_events(void)
2401 struct lttng_kernel_session_private
*session_priv
;
2403 list_for_each_entry(session_priv
, &sessions
, list
)
2404 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2408 static bool lttng_event_notifier_group_has_active_event_notifiers(
2409 struct lttng_event_notifier_group
*event_notifier_group
)
2411 struct lttng_event_enabler_common
*event_enabler
;
2413 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2414 if (event_enabler
->enabled
)
2420 bool lttng_event_notifier_active(void)
2422 struct lttng_event_notifier_group
*event_notifier_group
;
2424 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2425 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2431 int lttng_fix_pending_event_notifiers(void)
2433 struct lttng_event_notifier_group
*event_notifier_group
;
2435 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2436 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2440 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2441 enum lttng_enabler_format_type format_type
,
2442 struct lttng_kernel_abi_event
*event_param
,
2443 struct lttng_kernel_channel_buffer
*chan
)
2445 struct lttng_event_recorder_enabler
*event_enabler
;
2447 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2450 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2451 event_enabler
->parent
.format_type
= format_type
;
2452 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2453 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2454 sizeof(event_enabler
->parent
.event_param
));
2455 event_enabler
->chan
= chan
;
2457 event_enabler
->parent
.enabled
= 0;
2458 return event_enabler
;
2461 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2462 struct lttng_event_recorder_enabler
*event_enabler
)
2464 mutex_lock(&sessions_mutex
);
2465 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2466 event_enabler
->parent
.published
= true;
2467 lttng_session_lazy_sync_event_enablers(session
);
2468 mutex_unlock(&sessions_mutex
);
2471 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2473 mutex_lock(&sessions_mutex
);
2474 event_enabler
->enabled
= 1;
2475 lttng_event_enabler_sync(event_enabler
);
2476 mutex_unlock(&sessions_mutex
);
2480 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2482 mutex_lock(&sessions_mutex
);
2483 event_enabler
->enabled
= 0;
2484 lttng_event_enabler_sync(event_enabler
);
2485 mutex_unlock(&sessions_mutex
);
2490 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2491 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2493 struct lttng_kernel_bytecode_node
*bytecode_node
;
2494 uint32_t bytecode_len
;
2497 ret
= get_user(bytecode_len
, &bytecode
->len
);
2500 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2504 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2505 sizeof(*bytecode
) + bytecode_len
);
2509 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2510 bytecode_node
->enabler
= enabler
;
2511 /* Enforce length based on allocated size */
2512 bytecode_node
->bc
.len
= bytecode_len
;
2513 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2518 lttng_kvfree(bytecode_node
);
2522 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2523 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2526 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2529 lttng_event_enabler_sync(event_enabler
);
2536 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2537 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2540 switch (event
->priv
->instrumentation
) {
2541 case LTTNG_KERNEL_ABI_UPROBE
:
2542 return lttng_uprobes_event_add_callsite(event
, callsite
);
2549 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2551 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2553 /* Destroy filter bytecode */
2554 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2555 &enabler
->filter_bytecode_head
, node
) {
2556 lttng_kvfree(filter_node
);
2560 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2562 lttng_enabler_destroy(event_enabler
);
2563 if (event_enabler
->published
)
2564 list_del(&event_enabler
->node
);
2566 switch (event_enabler
->enabler_type
) {
2567 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2569 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2570 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2572 kfree(event_recorder_enabler
);
2575 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2577 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2578 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2580 kfree(event_notifier_enabler
);
2588 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2589 enum lttng_enabler_format_type format_type
,
2590 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2591 struct lttng_event_notifier_group
*event_notifier_group
)
2593 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2595 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2596 if (!event_notifier_enabler
)
2599 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2600 event_notifier_enabler
->parent
.format_type
= format_type
;
2601 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2602 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2604 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2605 event_notifier_enabler
->num_captures
= 0;
2607 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2608 sizeof(event_notifier_enabler
->parent
.event_param
));
2610 event_notifier_enabler
->parent
.enabled
= 0;
2611 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2612 event_notifier_enabler
->group
= event_notifier_group
;
2613 return event_notifier_enabler
;
2616 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2617 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2619 mutex_lock(&sessions_mutex
);
2620 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2621 event_notifier_enabler
->parent
.published
= true;
2622 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2623 mutex_unlock(&sessions_mutex
);
2626 int lttng_event_notifier_enabler_enable(
2627 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2629 mutex_lock(&sessions_mutex
);
2630 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2631 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2632 mutex_unlock(&sessions_mutex
);
2636 int lttng_event_notifier_enabler_disable(
2637 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2639 mutex_lock(&sessions_mutex
);
2640 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2641 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2642 mutex_unlock(&sessions_mutex
);
2646 int lttng_event_notifier_enabler_attach_capture_bytecode(
2647 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2648 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2650 struct lttng_kernel_bytecode_node
*bytecode_node
;
2651 struct lttng_event_enabler_common
*enabler
=
2652 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2653 uint32_t bytecode_len
;
2656 ret
= get_user(bytecode_len
, &bytecode
->len
);
2660 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2665 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2666 sizeof(*bytecode
) + bytecode_len
);
2670 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2671 bytecode_node
->enabler
= enabler
;
2673 /* Enforce length based on allocated size */
2674 bytecode_node
->bc
.len
= bytecode_len
;
2675 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2677 event_notifier_enabler
->num_captures
++;
2679 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2683 lttng_kvfree(bytecode_node
);
2689 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2691 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2692 struct lttng_kernel_bytecode_runtime
*runtime
;
2693 struct lttng_enabler_ref
*enabler_ref
;
2695 /* Check if has enablers without bytecode enabled */
2696 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2697 if (enabler_ref
->ref
->enabled
2698 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2699 has_enablers_without_filter_bytecode
= 1;
2703 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2705 /* Enable filters */
2706 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2707 lttng_bytecode_sync_state(runtime
);
2710 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2714 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2716 switch (event
->type
) {
2717 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2719 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2721 struct lttng_kernel_event_notifier
*event_notifier
=
2722 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2723 struct lttng_kernel_bytecode_runtime
*runtime
;
2724 int nr_captures
= 0;
2726 /* Enable captures */
2727 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2728 lttng_bytecode_sync_state(runtime
);
2731 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2740 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2742 struct lttng_enabler_ref
*enabler_ref
;
2743 bool enabled
= false;
2745 switch (event
->priv
->instrumentation
) {
2746 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2748 case LTTNG_KERNEL_ABI_SYSCALL
:
2750 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2751 if (enabler_ref
->ref
->enabled
) {
2762 switch (event
->type
) {
2763 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2765 struct lttng_kernel_event_recorder
*event_recorder
=
2766 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2769 * Enabled state is based on union of enablers, with
2770 * intersection of session and channel transient enable
2773 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2775 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2784 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2786 switch (event
->priv
->instrumentation
) {
2787 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2789 case LTTNG_KERNEL_ABI_SYSCALL
:
2793 /* Not handled with lazy sync. */
2799 * Should be called with sessions mutex held.
2802 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2803 struct list_head
*event_list
)
2805 struct lttng_kernel_event_common_private
*event_priv
;
2806 struct lttng_event_enabler_common
*event_enabler
;
2808 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2809 lttng_event_enabler_ref_events(event_enabler
);
2812 * For each event, if at least one of its enablers is enabled,
2813 * and its channel and session transient states are enabled, we
2814 * enable the event, else we disable it.
2816 list_for_each_entry(event_priv
, event_list
, node
) {
2817 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2820 if (!lttng_event_is_lazy_sync(event
))
2823 enabled
= lttng_get_event_enabled_state(event
);
2824 WRITE_ONCE(event
->enabled
, enabled
);
2826 * Sync tracepoint registration with event enabled state.
2829 register_event(event
);
2831 _lttng_event_unregister(event
);
2834 lttng_event_sync_filter_state(event
);
2835 lttng_event_sync_capture_state(event
);
2840 * lttng_session_sync_event_enablers should be called just before starting a
2844 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2846 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2850 * Apply enablers to session events, adding events to session if need
2851 * be. It is required after each modification applied to an active
2852 * session, and right before session "start".
2853 * "lazy" sync means we only sync if required.
2854 * Should be called with sessions mutex held.
2857 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2859 /* We can skip if session is not active */
2860 if (!session
->active
)
2862 lttng_session_sync_event_enablers(session
);
2866 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2868 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2872 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2874 switch (event_enabler
->enabler_type
) {
2875 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2877 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2878 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2879 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2882 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2884 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2885 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2886 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2895 * Serialize at most one packet worth of metadata into a metadata
2897 * We grab the metadata cache mutex to get exclusive access to our metadata
2898 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2899 * allows us to do racy operations such as looking for remaining space left in
2900 * packet and write, since mutual exclusion protects us from concurrent writes.
2901 * Mutual exclusion on the metadata cache allow us to read the cache content
2902 * without racing against reallocation of the cache by updates.
2903 * Returns the number of bytes written in the channel, 0 if no data
2904 * was written and a negative value on error.
2906 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2907 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2909 struct lttng_kernel_ring_buffer_ctx ctx
;
2911 size_t len
, reserve_len
;
2914 * Ensure we support mutiple get_next / put sequences followed by
2915 * put_next. The metadata cache lock protects reading the metadata
2916 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2917 * "flush" operations on the buffer invoked by different processes.
2918 * Moreover, since the metadata cache memory can be reallocated, we
2919 * need to have exclusive access against updates even though we only
2922 mutex_lock(&stream
->metadata_cache
->lock
);
2923 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2924 if (stream
->metadata_in
!= stream
->metadata_out
)
2927 /* Metadata regenerated, change the version. */
2928 if (stream
->metadata_cache
->version
!= stream
->version
)
2929 stream
->version
= stream
->metadata_cache
->version
;
2931 len
= stream
->metadata_cache
->metadata_written
-
2932 stream
->metadata_in
;
2935 reserve_len
= min_t(size_t,
2936 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2938 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2939 sizeof(char), NULL
);
2941 * If reservation failed, return an error to the caller.
2943 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2945 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2946 stream
->coherent
= false;
2949 stream
->transport
->ops
.event_write(&ctx
,
2950 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2952 stream
->transport
->ops
.event_commit(&ctx
);
2953 stream
->metadata_in
+= reserve_len
;
2954 if (reserve_len
< len
)
2955 stream
->coherent
= false;
2957 stream
->coherent
= true;
2962 *coherent
= stream
->coherent
;
2963 mutex_unlock(&stream
->metadata_cache
->lock
);
2968 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2970 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2971 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2975 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2977 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2978 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2979 struct lttng_metadata_stream
*stream
;
2981 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2982 wake_up_interruptible(&stream
->read_wait
);
2983 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2988 * Write the metadata to the metadata cache.
2989 * Must be called with sessions_mutex held.
2990 * The metadata cache lock protects us from concurrent read access from
2991 * thread outputting metadata content to ring buffer.
2992 * The content of the printf is printed as a single atomic metadata
2995 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2996 const char *fmt
, ...)
3002 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3005 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3011 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3012 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3013 session
->priv
->metadata_cache
->cache_alloc
) {
3014 char *tmp_cache_realloc
;
3015 unsigned int tmp_cache_alloc_size
;
3017 tmp_cache_alloc_size
= max_t(unsigned int,
3018 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3019 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3020 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3021 if (!tmp_cache_realloc
)
3023 if (session
->priv
->metadata_cache
->data
) {
3024 memcpy(tmp_cache_realloc
,
3025 session
->priv
->metadata_cache
->data
,
3026 session
->priv
->metadata_cache
->cache_alloc
);
3027 vfree(session
->priv
->metadata_cache
->data
);
3030 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3031 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3033 memcpy(session
->priv
->metadata_cache
->data
+
3034 session
->priv
->metadata_cache
->metadata_written
,
3036 session
->priv
->metadata_cache
->metadata_written
+= len
;
3047 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3051 for (i
= 0; i
< nesting
; i
++) {
3054 ret
= lttng_metadata_printf(session
, " ");
3063 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3064 const struct lttng_kernel_event_field
*field
,
3067 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3071 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3072 const struct lttng_kernel_type_integer
*type
,
3073 enum lttng_kernel_string_encoding parent_encoding
,
3078 ret
= print_tabs(session
, nesting
);
3081 ret
= lttng_metadata_printf(session
,
3082 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3086 (parent_encoding
== lttng_kernel_string_encoding_none
)
3088 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3092 #if __BYTE_ORDER == __BIG_ENDIAN
3093 type
->reverse_byte_order
? " byte_order = le;" : ""
3095 type
->reverse_byte_order
? " byte_order = be;" : ""
3102 * Must be called with sessions_mutex held.
3105 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3106 const struct lttng_kernel_type_struct
*type
,
3109 const char *prev_field_name
= NULL
;
3111 uint32_t i
, nr_fields
;
3112 unsigned int alignment
;
3114 ret
= print_tabs(session
, nesting
);
3117 ret
= lttng_metadata_printf(session
,
3121 nr_fields
= type
->nr_fields
;
3122 for (i
= 0; i
< nr_fields
; i
++) {
3123 const struct lttng_kernel_event_field
*iter_field
;
3125 iter_field
= type
->fields
[i
];
3126 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3130 ret
= print_tabs(session
, nesting
);
3133 alignment
= type
->alignment
;
3135 ret
= lttng_metadata_printf(session
,
3139 ret
= lttng_metadata_printf(session
,
3146 * Must be called with sessions_mutex held.
3149 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3150 const struct lttng_kernel_event_field
*field
,
3155 ret
= _lttng_struct_type_statedump(session
,
3156 lttng_kernel_get_type_struct(field
->type
), nesting
);
3159 return lttng_field_name_statedump(session
, field
, nesting
);
3163 * Must be called with sessions_mutex held.
3166 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3167 const struct lttng_kernel_type_variant
*type
,
3169 const char *prev_field_name
)
3171 const char *tag_name
;
3173 uint32_t i
, nr_choices
;
3175 tag_name
= type
->tag_name
;
3177 tag_name
= prev_field_name
;
3181 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3183 if (type
->alignment
!= 0)
3185 ret
= print_tabs(session
, nesting
);
3188 ret
= lttng_metadata_printf(session
,
3189 "variant <_%s> {\n",
3193 nr_choices
= type
->nr_choices
;
3194 for (i
= 0; i
< nr_choices
; i
++) {
3195 const struct lttng_kernel_event_field
*iter_field
;
3197 iter_field
= type
->choices
[i
];
3198 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3202 ret
= print_tabs(session
, nesting
);
3205 ret
= lttng_metadata_printf(session
,
3211 * Must be called with sessions_mutex held.
3214 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3215 const struct lttng_kernel_event_field
*field
,
3217 const char *prev_field_name
)
3221 ret
= _lttng_variant_type_statedump(session
,
3222 lttng_kernel_get_type_variant(field
->type
), nesting
,
3226 return lttng_field_name_statedump(session
, field
, nesting
);
3230 * Must be called with sessions_mutex held.
3233 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3234 const struct lttng_kernel_event_field
*field
,
3238 const struct lttng_kernel_type_array
*array_type
;
3239 const struct lttng_kernel_type_common
*elem_type
;
3241 array_type
= lttng_kernel_get_type_array(field
->type
);
3242 WARN_ON_ONCE(!array_type
);
3244 if (array_type
->alignment
) {
3245 ret
= print_tabs(session
, nesting
);
3248 ret
= lttng_metadata_printf(session
,
3249 "struct { } align(%u) _%s_padding;\n",
3250 array_type
->alignment
* CHAR_BIT
,
3256 * Nested compound types: Only array of structures and variants are
3257 * currently supported.
3259 elem_type
= array_type
->elem_type
;
3260 switch (elem_type
->type
) {
3261 case lttng_kernel_type_integer
:
3262 case lttng_kernel_type_struct
:
3263 case lttng_kernel_type_variant
:
3264 ret
= _lttng_type_statedump(session
, elem_type
,
3265 array_type
->encoding
, nesting
);
3273 ret
= lttng_metadata_printf(session
,
3276 array_type
->length
);
3281 * Must be called with sessions_mutex held.
3284 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3285 const struct lttng_kernel_event_field
*field
,
3287 const char *prev_field_name
)
3290 const char *length_name
;
3291 const struct lttng_kernel_type_sequence
*sequence_type
;
3292 const struct lttng_kernel_type_common
*elem_type
;
3294 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3295 WARN_ON_ONCE(!sequence_type
);
3297 length_name
= sequence_type
->length_name
;
3299 length_name
= prev_field_name
;
3303 if (sequence_type
->alignment
) {
3304 ret
= print_tabs(session
, nesting
);
3307 ret
= lttng_metadata_printf(session
,
3308 "struct { } align(%u) _%s_padding;\n",
3309 sequence_type
->alignment
* CHAR_BIT
,
3316 * Nested compound types: Only array of structures and variants are
3317 * currently supported.
3319 elem_type
= sequence_type
->elem_type
;
3320 switch (elem_type
->type
) {
3321 case lttng_kernel_type_integer
:
3322 case lttng_kernel_type_struct
:
3323 case lttng_kernel_type_variant
:
3324 ret
= _lttng_type_statedump(session
, elem_type
,
3325 sequence_type
->encoding
, nesting
);
3333 ret
= lttng_metadata_printf(session
,
3341 * Must be called with sessions_mutex held.
3344 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3345 const struct lttng_kernel_type_enum
*type
,
3348 const struct lttng_kernel_enum_desc
*enum_desc
;
3349 const struct lttng_kernel_type_common
*container_type
;
3351 unsigned int i
, nr_entries
;
3353 container_type
= type
->container_type
;
3354 if (container_type
->type
!= lttng_kernel_type_integer
) {
3358 enum_desc
= type
->desc
;
3359 nr_entries
= enum_desc
->nr_entries
;
3361 ret
= print_tabs(session
, nesting
);
3364 ret
= lttng_metadata_printf(session
, "enum : ");
3367 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3368 lttng_kernel_string_encoding_none
, 0);
3371 ret
= lttng_metadata_printf(session
, " {\n");
3374 /* Dump all entries */
3375 for (i
= 0; i
< nr_entries
; i
++) {
3376 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3379 ret
= print_tabs(session
, nesting
+ 1);
3382 ret
= lttng_metadata_printf(session
,
3386 len
= strlen(entry
->string
);
3387 /* Escape the character '"' */
3388 for (j
= 0; j
< len
; j
++) {
3389 char c
= entry
->string
[j
];
3393 ret
= lttng_metadata_printf(session
,
3397 ret
= lttng_metadata_printf(session
,
3401 ret
= lttng_metadata_printf(session
,
3408 ret
= lttng_metadata_printf(session
, "\"");
3412 if (entry
->options
.is_auto
) {
3413 ret
= lttng_metadata_printf(session
, ",\n");
3417 ret
= lttng_metadata_printf(session
,
3421 if (entry
->start
.signedness
)
3422 ret
= lttng_metadata_printf(session
,
3423 "%lld", (long long) entry
->start
.value
);
3425 ret
= lttng_metadata_printf(session
,
3426 "%llu", entry
->start
.value
);
3429 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3431 == entry
->end
.value
) {
3432 ret
= lttng_metadata_printf(session
,
3435 if (entry
->end
.signedness
) {
3436 ret
= lttng_metadata_printf(session
,
3438 (long long) entry
->end
.value
);
3440 ret
= lttng_metadata_printf(session
,
3449 ret
= print_tabs(session
, nesting
);
3452 ret
= lttng_metadata_printf(session
, "}");
3458 * Must be called with sessions_mutex held.
3461 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3462 const struct lttng_kernel_event_field
*field
,
3466 const struct lttng_kernel_type_enum
*enum_type
;
3468 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3469 WARN_ON_ONCE(!enum_type
);
3470 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3473 return lttng_field_name_statedump(session
, field
, nesting
);
3477 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3478 const struct lttng_kernel_event_field
*field
,
3483 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3484 lttng_kernel_string_encoding_none
, nesting
);
3487 return lttng_field_name_statedump(session
, field
, nesting
);
3491 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3492 const struct lttng_kernel_type_string
*type
,
3497 /* Default encoding is UTF8 */
3498 ret
= print_tabs(session
, nesting
);
3501 ret
= lttng_metadata_printf(session
,
3503 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3504 " { encoding = ASCII; }" : "");
3509 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3510 const struct lttng_kernel_event_field
*field
,
3513 const struct lttng_kernel_type_string
*string_type
;
3516 string_type
= lttng_kernel_get_type_string(field
->type
);
3517 WARN_ON_ONCE(!string_type
);
3518 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3521 return lttng_field_name_statedump(session
, field
, nesting
);
3525 * Must be called with sessions_mutex held.
3528 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3529 const struct lttng_kernel_type_common
*type
,
3530 enum lttng_kernel_string_encoding parent_encoding
,
3535 switch (type
->type
) {
3536 case lttng_kernel_type_integer
:
3537 ret
= _lttng_integer_type_statedump(session
,
3538 lttng_kernel_get_type_integer(type
),
3539 parent_encoding
, nesting
);
3541 case lttng_kernel_type_enum
:
3542 ret
= _lttng_enum_type_statedump(session
,
3543 lttng_kernel_get_type_enum(type
),
3546 case lttng_kernel_type_string
:
3547 ret
= _lttng_string_type_statedump(session
,
3548 lttng_kernel_get_type_string(type
),
3551 case lttng_kernel_type_struct
:
3552 ret
= _lttng_struct_type_statedump(session
,
3553 lttng_kernel_get_type_struct(type
),
3556 case lttng_kernel_type_variant
:
3557 ret
= _lttng_variant_type_statedump(session
,
3558 lttng_kernel_get_type_variant(type
),
3562 /* Nested arrays and sequences are not supported yet. */
3563 case lttng_kernel_type_array
:
3564 case lttng_kernel_type_sequence
:
3573 * Must be called with sessions_mutex held.
3576 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3577 const struct lttng_kernel_event_field
*field
,
3579 const char **prev_field_name_p
)
3581 const char *prev_field_name
= NULL
;
3584 if (prev_field_name_p
)
3585 prev_field_name
= *prev_field_name_p
;
3586 switch (field
->type
->type
) {
3587 case lttng_kernel_type_integer
:
3588 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3590 case lttng_kernel_type_enum
:
3591 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3593 case lttng_kernel_type_string
:
3594 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3596 case lttng_kernel_type_struct
:
3597 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3599 case lttng_kernel_type_array
:
3600 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3602 case lttng_kernel_type_sequence
:
3603 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3605 case lttng_kernel_type_variant
:
3606 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3613 if (prev_field_name_p
)
3614 *prev_field_name_p
= field
->name
;
3619 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3620 struct lttng_kernel_ctx
*ctx
)
3622 const char *prev_field_name
= NULL
;
3628 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3629 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3631 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3639 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3640 struct lttng_kernel_event_recorder
*event_recorder
)
3642 const char *prev_field_name
= NULL
;
3643 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3647 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3648 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3650 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3658 * Must be called with sessions_mutex held.
3659 * The entire event metadata is printed as a single atomic metadata
3663 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3665 struct lttng_kernel_event_recorder
*event_recorder
;
3666 struct lttng_kernel_channel_buffer
*chan
;
3667 struct lttng_kernel_session
*session
;
3670 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3672 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3673 chan
= event_recorder
->chan
;
3674 session
= chan
->parent
.session
;
3676 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3678 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3681 lttng_metadata_begin(session
);
3683 ret
= lttng_metadata_printf(session
,
3687 " stream_id = %u;\n",
3688 event_recorder
->priv
->parent
.desc
->event_name
,
3689 event_recorder
->priv
->id
,
3690 event_recorder
->chan
->priv
->id
);
3694 ret
= lttng_metadata_printf(session
,
3695 " fields := struct {\n"
3700 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3705 * LTTng space reservation can only reserve multiples of the
3708 ret
= lttng_metadata_printf(session
,
3714 event_recorder
->priv
->metadata_dumped
= 1;
3716 lttng_metadata_end(session
);
3722 * Must be called with sessions_mutex held.
3723 * The entire channel metadata is printed as a single atomic metadata
3727 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3728 struct lttng_kernel_channel_buffer
*chan
)
3732 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3735 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3738 lttng_metadata_begin(session
);
3740 WARN_ON_ONCE(!chan
->priv
->header_type
);
3741 ret
= lttng_metadata_printf(session
,
3744 " event.header := %s;\n"
3745 " packet.context := struct packet_context;\n",
3747 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3748 "struct event_header_large");
3752 if (chan
->priv
->ctx
) {
3753 ret
= lttng_metadata_printf(session
,
3754 " event.context := struct {\n");
3758 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3761 if (chan
->priv
->ctx
) {
3762 ret
= lttng_metadata_printf(session
,
3768 ret
= lttng_metadata_printf(session
,
3771 chan
->priv
->metadata_dumped
= 1;
3773 lttng_metadata_end(session
);
3778 * Must be called with sessions_mutex held.
3781 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3783 return lttng_metadata_printf(session
,
3784 "struct packet_context {\n"
3785 " uint64_clock_monotonic_t timestamp_begin;\n"
3786 " uint64_clock_monotonic_t timestamp_end;\n"
3787 " uint64_t content_size;\n"
3788 " uint64_t packet_size;\n"
3789 " uint64_t packet_seq_num;\n"
3790 " unsigned long events_discarded;\n"
3791 " uint32_t cpu_id;\n"
3798 * id: range: 0 - 30.
3799 * id 31 is reserved to indicate an extended header.
3802 * id: range: 0 - 65534.
3803 * id 65535 is reserved to indicate an extended header.
3805 * Must be called with sessions_mutex held.
3808 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3810 return lttng_metadata_printf(session
,
3811 "struct event_header_compact {\n"
3812 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3815 " uint27_clock_monotonic_t timestamp;\n"
3819 " uint64_clock_monotonic_t timestamp;\n"
3824 "struct event_header_large {\n"
3825 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3828 " uint32_clock_monotonic_t timestamp;\n"
3832 " uint64_clock_monotonic_t timestamp;\n"
3836 lttng_alignof(uint32_t) * CHAR_BIT
,
3837 lttng_alignof(uint16_t) * CHAR_BIT
3842 * Approximation of NTP time of day to clock monotonic correlation,
3843 * taken at start of trace.
3844 * Yes, this is only an approximation. Yes, we can (and will) do better
3845 * in future versions.
3846 * This function may return a negative offset. It may happen if the
3847 * system sets the REALTIME clock to 0 after boot.
3849 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3853 int64_t measure_clock_offset(void)
3855 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3856 uint64_t tcf
= trace_clock_freq();
3858 unsigned long flags
;
3859 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3860 struct timespec64 rts
= { 0, 0 };
3862 struct timespec rts
= { 0, 0 };
3865 /* Disable interrupts to increase correlation precision. */
3866 local_irq_save(flags
);
3867 monotonic
[0] = trace_clock_read64();
3868 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3869 ktime_get_real_ts64(&rts
);
3871 getnstimeofday(&rts
);
3873 monotonic
[1] = trace_clock_read64();
3874 local_irq_restore(flags
);
3876 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3877 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3878 if (tcf
== NSEC_PER_SEC
) {
3879 realtime
+= rts
.tv_nsec
;
3881 uint64_t n
= rts
.tv_nsec
* tcf
;
3883 do_div(n
, NSEC_PER_SEC
);
3886 offset
= (int64_t) realtime
- monotonic_avg
;
3891 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3899 while (cur
!= '\0') {
3902 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3906 ret
= lttng_metadata_printf(session
, "%c", '\\');
3909 /* We still print the current char */
3912 ret
= lttng_metadata_printf(session
, "%c", cur
);
3926 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3927 const char *field_value
)
3931 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3935 ret
= print_escaped_ctf_string(session
, field_value
);
3939 ret
= lttng_metadata_printf(session
, "\";\n");
3946 * Output metadata into this session's metadata buffers.
3947 * Must be called with sessions_mutex held.
3950 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3952 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3953 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3954 const char *product_uuid
;
3955 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3956 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3959 if (!LTTNG_READ_ONCE(session
->active
))
3962 lttng_metadata_begin(session
);
3964 if (session
->priv
->metadata_dumped
)
3967 snprintf(uuid_s
, sizeof(uuid_s
),
3968 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3969 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3970 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3971 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3972 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3974 ret
= lttng_metadata_printf(session
,
3975 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3976 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3977 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3978 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3979 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3980 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3981 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3987 " byte_order = %s;\n"
3988 " packet.header := struct {\n"
3989 " uint32_t magic;\n"
3990 " uint8_t uuid[16];\n"
3991 " uint32_t stream_id;\n"
3992 " uint64_t stream_instance_id;\n"
3995 lttng_alignof(uint8_t) * CHAR_BIT
,
3996 lttng_alignof(uint16_t) * CHAR_BIT
,
3997 lttng_alignof(uint32_t) * CHAR_BIT
,
3998 lttng_alignof(uint64_t) * CHAR_BIT
,
3999 sizeof(unsigned long) * CHAR_BIT
,
4000 lttng_alignof(unsigned long) * CHAR_BIT
,
4004 #if __BYTE_ORDER == __BIG_ENDIAN
4013 ret
= lttng_metadata_printf(session
,
4015 " hostname = \"%s\";\n"
4016 " domain = \"kernel\";\n"
4017 " sysname = \"%s\";\n"
4018 " kernel_release = \"%s\";\n"
4019 " kernel_version = \"%s\";\n"
4020 " tracer_name = \"lttng-modules\";\n"
4021 " tracer_major = %d;\n"
4022 " tracer_minor = %d;\n"
4023 " tracer_patchlevel = %d;\n"
4024 " trace_buffering_scheme = \"global\";\n",
4025 current
->nsproxy
->uts_ns
->name
.nodename
,
4029 LTTNG_MODULES_MAJOR_VERSION
,
4030 LTTNG_MODULES_MINOR_VERSION
,
4031 LTTNG_MODULES_PATCHLEVEL_VERSION
4036 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4039 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4040 session
->priv
->creation_time
);
4044 /* Add the product UUID to the 'env' section */
4045 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4047 ret
= lttng_metadata_printf(session
,
4048 " product_uuid = \"%s\";\n",
4055 /* Close the 'env' section */
4056 ret
= lttng_metadata_printf(session
, "};\n\n");
4060 ret
= lttng_metadata_printf(session
,
4062 " name = \"%s\";\n",
4068 if (!trace_clock_uuid(clock_uuid_s
)) {
4069 ret
= lttng_metadata_printf(session
,
4070 " uuid = \"%s\";\n",
4077 ret
= lttng_metadata_printf(session
,
4078 " description = \"%s\";\n"
4079 " freq = %llu; /* Frequency, in Hz */\n"
4080 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4083 trace_clock_description(),
4084 (unsigned long long) trace_clock_freq(),
4085 (long long) measure_clock_offset()
4090 ret
= lttng_metadata_printf(session
,
4091 "typealias integer {\n"
4092 " size = 27; align = 1; signed = false;\n"
4093 " map = clock.%s.value;\n"
4094 "} := uint27_clock_monotonic_t;\n"
4096 "typealias integer {\n"
4097 " size = 32; align = %u; signed = false;\n"
4098 " map = clock.%s.value;\n"
4099 "} := uint32_clock_monotonic_t;\n"
4101 "typealias integer {\n"
4102 " size = 64; align = %u; signed = false;\n"
4103 " map = clock.%s.value;\n"
4104 "} := uint64_clock_monotonic_t;\n\n",
4106 lttng_alignof(uint32_t) * CHAR_BIT
,
4108 lttng_alignof(uint64_t) * CHAR_BIT
,
4114 ret
= _lttng_stream_packet_context_declare(session
);
4118 ret
= _lttng_event_header_declare(session
);
4123 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4124 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4129 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4130 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
4134 session
->priv
->metadata_dumped
= 1;
4136 lttng_metadata_end(session
);
4141 * lttng_transport_register - LTT transport registration
4142 * @transport: transport structure
4144 * Registers a transport which can be used as output to extract the data out of
4145 * LTTng. The module calling this registration function must ensure that no
4146 * trap-inducing code will be executed by the transport functions. E.g.
4147 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4148 * is made visible to the transport function. This registration acts as a
4149 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4150 * after its registration must it synchronize the TLBs.
4152 void lttng_transport_register(struct lttng_transport
*transport
)
4155 * Make sure no page fault can be triggered by the module about to be
4156 * registered. We deal with this here so we don't have to call
4157 * vmalloc_sync_mappings() in each module's init.
4159 wrapper_vmalloc_sync_mappings();
4161 mutex_lock(&sessions_mutex
);
4162 list_add_tail(&transport
->node
, <tng_transport_list
);
4163 mutex_unlock(&sessions_mutex
);
4165 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4168 * lttng_transport_unregister - LTT transport unregistration
4169 * @transport: transport structure
4171 void lttng_transport_unregister(struct lttng_transport
*transport
)
4173 mutex_lock(&sessions_mutex
);
4174 list_del(&transport
->node
);
4175 mutex_unlock(&sessions_mutex
);
4177 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4179 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4182 * Make sure no page fault can be triggered by the module about to be
4183 * registered. We deal with this here so we don't have to call
4184 * vmalloc_sync_mappings() in each module's init.
4186 wrapper_vmalloc_sync_mappings();
4188 mutex_lock(&sessions_mutex
);
4189 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4190 mutex_unlock(&sessions_mutex
);
4192 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4194 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4196 mutex_lock(&sessions_mutex
);
4197 list_del(&transport
->node
);
4198 mutex_unlock(&sessions_mutex
);
4200 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4202 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4204 enum cpuhp_state lttng_hp_prepare
;
4205 enum cpuhp_state lttng_hp_online
;
4207 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4209 struct lttng_cpuhp_node
*lttng_node
;
4211 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4212 switch (lttng_node
->component
) {
4213 case LTTNG_RING_BUFFER_FRONTEND
:
4215 case LTTNG_RING_BUFFER_BACKEND
:
4216 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4217 case LTTNG_RING_BUFFER_ITER
:
4219 case LTTNG_CONTEXT_PERF_COUNTERS
:
4226 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4228 struct lttng_cpuhp_node
*lttng_node
;
4230 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4231 switch (lttng_node
->component
) {
4232 case LTTNG_RING_BUFFER_FRONTEND
:
4233 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4234 case LTTNG_RING_BUFFER_BACKEND
:
4236 case LTTNG_RING_BUFFER_ITER
:
4238 case LTTNG_CONTEXT_PERF_COUNTERS
:
4239 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4245 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4247 struct lttng_cpuhp_node
*lttng_node
;
4249 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4250 switch (lttng_node
->component
) {
4251 case LTTNG_RING_BUFFER_FRONTEND
:
4252 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4253 case LTTNG_RING_BUFFER_BACKEND
:
4255 case LTTNG_RING_BUFFER_ITER
:
4256 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4257 case LTTNG_CONTEXT_PERF_COUNTERS
:
4258 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4264 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4266 struct lttng_cpuhp_node
*lttng_node
;
4268 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4269 switch (lttng_node
->component
) {
4270 case LTTNG_RING_BUFFER_FRONTEND
:
4271 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4272 case LTTNG_RING_BUFFER_BACKEND
:
4274 case LTTNG_RING_BUFFER_ITER
:
4276 case LTTNG_CONTEXT_PERF_COUNTERS
:
4283 static int __init
lttng_init_cpu_hotplug(void)
4287 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4288 lttng_hotplug_prepare
,
4289 lttng_hotplug_dead
);
4293 lttng_hp_prepare
= ret
;
4294 lttng_rb_set_hp_prepare(ret
);
4296 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4297 lttng_hotplug_online
,
4298 lttng_hotplug_offline
);
4300 cpuhp_remove_multi_state(lttng_hp_prepare
);
4301 lttng_hp_prepare
= 0;
4304 lttng_hp_online
= ret
;
4305 lttng_rb_set_hp_online(ret
);
4310 static void __exit
lttng_exit_cpu_hotplug(void)
4312 lttng_rb_set_hp_online(0);
4313 cpuhp_remove_multi_state(lttng_hp_online
);
4314 lttng_rb_set_hp_prepare(0);
4315 cpuhp_remove_multi_state(lttng_hp_prepare
);
4318 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4319 static int lttng_init_cpu_hotplug(void)
4323 static void lttng_exit_cpu_hotplug(void)
4326 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4328 static int __init
lttng_events_init(void)
4332 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4335 ret
= wrapper_get_pfnblock_flags_mask_init();
4338 ret
= wrapper_get_pageblock_flags_mask_init();
4341 ret
= lttng_probes_init();
4344 ret
= lttng_context_init();
4347 ret
= lttng_tracepoint_init();
4350 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4351 if (!event_recorder_cache
) {
4353 goto error_kmem_event_recorder
;
4355 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4356 if (!event_recorder_private_cache
) {
4358 goto error_kmem_event_recorder_private
;
4360 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4361 if (!event_notifier_cache
) {
4363 goto error_kmem_event_notifier
;
4365 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4366 if (!event_notifier_private_cache
) {
4368 goto error_kmem_event_notifier_private
;
4370 ret
= lttng_abi_init();
4373 ret
= lttng_logger_init();
4376 ret
= lttng_init_cpu_hotplug();
4379 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4380 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4381 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4382 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4383 LTTNG_MODULES_EXTRAVERSION
,
4385 #ifdef LTTNG_EXTRA_VERSION_GIT
4386 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4390 #ifdef LTTNG_EXTRA_VERSION_NAME
4391 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4395 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4396 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4397 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4401 lttng_logger_exit();
4405 kmem_cache_destroy(event_notifier_private_cache
);
4406 error_kmem_event_notifier_private
:
4407 kmem_cache_destroy(event_notifier_cache
);
4408 error_kmem_event_notifier
:
4409 kmem_cache_destroy(event_recorder_private_cache
);
4410 error_kmem_event_recorder_private
:
4411 kmem_cache_destroy(event_recorder_cache
);
4412 error_kmem_event_recorder
:
4413 lttng_tracepoint_exit();
4415 lttng_context_exit();
4416 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4417 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4418 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4419 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4420 LTTNG_MODULES_EXTRAVERSION
,
4422 #ifdef LTTNG_EXTRA_VERSION_GIT
4423 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4427 #ifdef LTTNG_EXTRA_VERSION_NAME
4428 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4435 module_init(lttng_events_init
);
4437 static void __exit
lttng_events_exit(void)
4439 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4441 lttng_exit_cpu_hotplug();
4442 lttng_logger_exit();
4444 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4445 lttng_session_destroy(session_priv
->pub
);
4446 kmem_cache_destroy(event_recorder_cache
);
4447 kmem_cache_destroy(event_recorder_private_cache
);
4448 kmem_cache_destroy(event_notifier_cache
);
4449 kmem_cache_destroy(event_notifier_private_cache
);
4450 lttng_tracepoint_exit();
4451 lttng_context_exit();
4452 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4453 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4454 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4455 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4456 LTTNG_MODULES_EXTRAVERSION
,
4458 #ifdef LTTNG_EXTRA_VERSION_GIT
4459 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4463 #ifdef LTTNG_EXTRA_VERSION_NAME
4464 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4470 module_exit(lttng_events_exit
);
4472 #include <generated/patches.h>
4473 #ifdef LTTNG_EXTRA_VERSION_GIT
4474 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4476 #ifdef LTTNG_EXTRA_VERSION_NAME
4477 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4479 MODULE_LICENSE("GPL and additional rights");
4480 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4481 MODULE_DESCRIPTION("LTTng tracer");
4482 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4483 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4484 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4485 LTTNG_MODULES_EXTRAVERSION
);