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
;
1125 struct lttng_kernel_event_recorder
*event_recorder_return
;
1127 /* kretprobe defines 2 events */
1129 * Needs to be explicitly enabled after creation, since
1130 * we may want to apply filters.
1133 event
->priv
->registered
= 1;
1135 event_return
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1140 event_recorder_return
= container_of(event_return
, struct lttng_kernel_event_recorder
, parent
);
1142 event_return
->enabled
= 0;
1143 event_return
->priv
->registered
= 1;
1146 * Populate lttng_event structure before kretprobe registration.
1149 ret
= lttng_kretprobes_register(event_name
,
1150 event_param
->u
.kretprobe
.symbol_name
,
1151 event_param
->u
.kretprobe
.offset
,
1152 event_param
->u
.kretprobe
.addr
,
1153 event
, event_return
);
1155 lttng_kernel_event_free(event_return
);
1157 goto register_error
;
1159 /* Take 2 refs on the module: one per event. */
1160 ret
= try_module_get(event
->priv
->desc
->owner
);
1162 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1164 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1165 WARN_ON_ONCE(ret
> 0);
1167 lttng_kernel_event_free(event_return
);
1168 module_put(event_return
->priv
->desc
->owner
);
1169 module_put(event
->priv
->desc
->owner
);
1170 goto statedump_error
;
1172 list_add(&event_return
->priv
->node
, event_list_head
);
1176 case LTTNG_KERNEL_ABI_SYSCALL
:
1178 * Needs to be explicitly enabled after creation, since
1179 * we may want to apply filters.
1182 event
->priv
->registered
= 0;
1183 event
->priv
->desc
= event_desc
;
1184 switch (event_param
->u
.syscall
.entryexit
) {
1185 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1187 goto register_error
;
1188 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1189 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1191 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1192 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1195 switch (event_param
->u
.syscall
.abi
) {
1196 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1198 goto register_error
;
1199 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1200 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1202 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1203 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1206 if (!event
->priv
->desc
) {
1208 goto register_error
;
1212 case LTTNG_KERNEL_ABI_UPROBE
:
1214 * Needs to be explicitly enabled after creation, since
1215 * we may want to apply filters.
1218 event
->priv
->registered
= 1;
1221 * Populate lttng_event structure before event
1226 ret
= lttng_uprobes_register_event(event_param
->name
,
1227 event_param
->u
.uprobe
.fd
,
1230 goto register_error
;
1231 ret
= try_module_get(event
->priv
->desc
->owner
);
1235 case LTTNG_KERNEL_ABI_FUNCTION
:
1237 case LTTNG_KERNEL_ABI_NOOP
:
1242 goto register_error
;
1244 ret
= _lttng_event_recorder_metadata_statedump(event
);
1245 WARN_ON_ONCE(ret
> 0);
1247 goto statedump_error
;
1249 hlist_add_head(&event
->priv
->hlist_node
, head
);
1250 list_add(&event
->priv
->node
, event_list_head
);
1251 return event_recorder
;
1254 /* If a statedump error occurs, events will not be readable. */
1256 lttng_kernel_event_free(event
);
1261 return ERR_PTR(ret
);
1265 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1266 const struct lttng_kernel_event_desc
*event_desc
)
1268 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1269 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1270 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1271 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1272 struct lttng_kernel_event_common_private
*event_priv
;
1273 struct lttng_kernel_event_common
*event
;
1274 struct lttng_kernel_event_notifier
*event_notifier
;
1275 const char *event_name
;
1276 struct hlist_head
*head
;
1280 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1281 event_name
= event_desc
->event_name
;
1284 case LTTNG_KERNEL_ABI_KPROBE
:
1286 case LTTNG_KERNEL_ABI_UPROBE
:
1288 case LTTNG_KERNEL_ABI_SYSCALL
:
1289 event_name
= event_param
->name
;
1292 case LTTNG_KERNEL_ABI_KRETPROBE
:
1294 case LTTNG_KERNEL_ABI_FUNCTION
:
1296 case LTTNG_KERNEL_ABI_NOOP
:
1304 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1305 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1306 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1312 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1317 event_notifier
= container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1320 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1321 /* Event will be enabled by enabler sync. */
1323 event
->priv
->registered
= 0;
1324 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1325 if (!event
->priv
->desc
) {
1327 goto register_error
;
1329 /* Populate lttng_event_notifier structure before event registration. */
1333 case LTTNG_KERNEL_ABI_KPROBE
:
1335 * Needs to be explicitly enabled after creation, since
1336 * we may want to apply filters.
1339 event
->priv
->registered
= 1;
1341 * Populate lttng_event_notifier structure before event
1345 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1346 event_param
->u
.kprobe
.symbol_name
,
1347 event_param
->u
.kprobe
.offset
,
1348 event_param
->u
.kprobe
.addr
,
1352 goto register_error
;
1354 ret
= try_module_get(event
->priv
->desc
->owner
);
1358 case LTTNG_KERNEL_ABI_SYSCALL
:
1360 * Needs to be explicitly enabled after creation, since
1361 * we may want to apply filters.
1364 event
->priv
->registered
= 0;
1365 event
->priv
->desc
= event_desc
;
1366 switch (event_param
->u
.syscall
.entryexit
) {
1367 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1369 goto register_error
;
1370 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1371 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1373 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1374 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1377 switch (event_param
->u
.syscall
.abi
) {
1378 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1380 goto register_error
;
1381 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1382 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1384 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1385 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1389 if (!event
->priv
->desc
) {
1391 goto register_error
;
1395 case LTTNG_KERNEL_ABI_UPROBE
:
1397 * Needs to be explicitly enabled after creation, since
1398 * we may want to apply filters.
1401 event
->priv
->registered
= 1;
1404 * Populate lttng_event_notifier structure before
1405 * event_notifier registration.
1409 ret
= lttng_uprobes_register_event(event_param
->name
,
1410 event_param
->u
.uprobe
.fd
,
1413 goto register_error
;
1414 ret
= try_module_get(event
->priv
->desc
->owner
);
1418 case LTTNG_KERNEL_ABI_KRETPROBE
:
1420 case LTTNG_KERNEL_ABI_FUNCTION
:
1422 case LTTNG_KERNEL_ABI_NOOP
:
1427 goto register_error
;
1430 list_add(&event
->priv
->node
, event_list_head
);
1431 hlist_add_head(&event
->priv
->hlist_node
, head
);
1433 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1435 goto register_error
;
1436 return event_notifier
;
1439 lttng_kernel_event_free(event
);
1443 return ERR_PTR(ret
);
1446 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1447 const struct lttng_kernel_event_desc
*event_desc
)
1449 switch (event_enabler
->enabler_type
) {
1450 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1452 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1453 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1454 struct lttng_kernel_event_recorder
*event_recorder
;
1456 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1457 if (!event_recorder
)
1459 return &event_recorder
->parent
;
1461 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1463 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1464 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1465 struct lttng_kernel_event_notifier
*event_notifier
;
1467 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1468 if (!event_notifier
)
1470 return &event_notifier
->parent
;
1477 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1478 const struct lttng_kernel_event_desc
*event_desc
)
1480 struct lttng_kernel_event_common
*event
;
1482 mutex_lock(&sessions_mutex
);
1483 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1484 mutex_unlock(&sessions_mutex
);
1490 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1491 const size_t *dim_indexes
, int32_t cpu
,
1492 int64_t *val
, bool *overflow
, bool *underflow
)
1494 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1495 cpu
, val
, overflow
, underflow
);
1498 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1499 const size_t *dim_indexes
, int64_t *val
,
1500 bool *overflow
, bool *underflow
)
1502 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1503 val
, overflow
, underflow
);
1506 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1507 const size_t *dim_indexes
)
1509 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1512 /* Only used for tracepoints for now. */
1514 void register_event(struct lttng_kernel_event_common
*event
)
1516 const struct lttng_kernel_event_desc
*desc
;
1519 if (event
->priv
->registered
)
1522 desc
= event
->priv
->desc
;
1523 switch (event
->priv
->instrumentation
) {
1524 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1525 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1526 desc
->tp_class
->probe_callback
,
1530 case LTTNG_KERNEL_ABI_SYSCALL
:
1531 ret
= lttng_syscall_filter_enable_event(event
);
1534 case LTTNG_KERNEL_ABI_KPROBE
:
1536 case LTTNG_KERNEL_ABI_UPROBE
:
1540 case LTTNG_KERNEL_ABI_KRETPROBE
:
1541 switch (event
->type
) {
1542 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1545 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1551 case LTTNG_KERNEL_ABI_FUNCTION
:
1553 case LTTNG_KERNEL_ABI_NOOP
:
1559 event
->priv
->registered
= 1;
1562 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1564 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1565 const struct lttng_kernel_event_desc
*desc
;
1568 if (!event_priv
->registered
)
1571 desc
= event_priv
->desc
;
1572 switch (event_priv
->instrumentation
) {
1573 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1574 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1575 event_priv
->desc
->tp_class
->probe_callback
,
1579 case LTTNG_KERNEL_ABI_KPROBE
:
1580 lttng_kprobes_unregister_event(event
);
1584 case LTTNG_KERNEL_ABI_KRETPROBE
:
1585 switch (event
->type
) {
1586 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1587 lttng_kretprobes_unregister(event
);
1590 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1596 case LTTNG_KERNEL_ABI_SYSCALL
:
1597 ret
= lttng_syscall_filter_disable_event(event
);
1600 case LTTNG_KERNEL_ABI_NOOP
:
1601 switch (event
->type
) {
1602 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1605 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1611 case LTTNG_KERNEL_ABI_UPROBE
:
1612 lttng_uprobes_unregister_event(event
);
1616 case LTTNG_KERNEL_ABI_FUNCTION
:
1622 event_priv
->registered
= 0;
1627 * Only used internally at session destruction.
1630 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1632 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1633 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1635 lttng_free_event_filter_runtime(event
);
1636 /* Free event enabler refs */
1637 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1638 &event_priv
->enablers_ref_head
, node
)
1641 switch (event
->type
) {
1642 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1644 struct lttng_kernel_event_recorder
*event_recorder
=
1645 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1647 switch (event_priv
->instrumentation
) {
1648 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1649 lttng_event_desc_put(event_priv
->desc
);
1652 case LTTNG_KERNEL_ABI_KPROBE
:
1653 module_put(event_priv
->desc
->owner
);
1654 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1657 case LTTNG_KERNEL_ABI_KRETPROBE
:
1658 module_put(event_priv
->desc
->owner
);
1659 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1662 case LTTNG_KERNEL_ABI_SYSCALL
:
1665 case LTTNG_KERNEL_ABI_UPROBE
:
1666 module_put(event_priv
->desc
->owner
);
1667 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1670 case LTTNG_KERNEL_ABI_FUNCTION
:
1672 case LTTNG_KERNEL_ABI_NOOP
:
1677 list_del(&event_recorder
->priv
->parent
.node
);
1678 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1679 kmem_cache_free(event_recorder_cache
, event_recorder
);
1682 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1684 struct lttng_kernel_event_notifier
*event_notifier
=
1685 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1687 switch (event_notifier
->priv
->parent
.instrumentation
) {
1688 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1689 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1692 case LTTNG_KERNEL_ABI_KPROBE
:
1693 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1694 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1697 case LTTNG_KERNEL_ABI_SYSCALL
:
1700 case LTTNG_KERNEL_ABI_UPROBE
:
1701 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1702 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1705 case LTTNG_KERNEL_ABI_KRETPROBE
:
1707 case LTTNG_KERNEL_ABI_FUNCTION
:
1709 case LTTNG_KERNEL_ABI_NOOP
:
1714 list_del(&event_notifier
->priv
->parent
.node
);
1715 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1716 kmem_cache_free(event_notifier_cache
, event_notifier
);
1724 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1725 enum tracker_type tracker_type
)
1727 switch (tracker_type
) {
1729 return &session
->pid_tracker
;
1731 return &session
->vpid_tracker
;
1733 return &session
->uid_tracker
;
1735 return &session
->vuid_tracker
;
1737 return &session
->gid_tracker
;
1739 return &session
->vgid_tracker
;
1746 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1747 enum tracker_type tracker_type
, int id
)
1749 struct lttng_kernel_id_tracker
*tracker
;
1752 tracker
= get_tracker(session
, tracker_type
);
1757 mutex_lock(&sessions_mutex
);
1759 /* track all ids: destroy tracker. */
1760 lttng_id_tracker_destroy(tracker
, true);
1763 ret
= lttng_id_tracker_add(tracker
, id
);
1765 mutex_unlock(&sessions_mutex
);
1769 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1770 enum tracker_type tracker_type
, int id
)
1772 struct lttng_kernel_id_tracker
*tracker
;
1775 tracker
= get_tracker(session
, tracker_type
);
1780 mutex_lock(&sessions_mutex
);
1782 /* untrack all ids: replace by empty tracker. */
1783 ret
= lttng_id_tracker_empty_set(tracker
);
1785 ret
= lttng_id_tracker_del(tracker
, id
);
1787 mutex_unlock(&sessions_mutex
);
1792 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1794 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1795 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1796 struct lttng_id_hash_node
*e
;
1799 mutex_lock(&sessions_mutex
);
1801 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1802 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1804 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1810 /* ID tracker disabled. */
1811 if (iter
>= *pos
&& iter
== 0) {
1812 return id_tracker_p
; /* empty tracker */
1820 /* Called with sessions_mutex held. */
1822 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1824 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1825 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1826 struct lttng_id_hash_node
*e
;
1831 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1832 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1834 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1835 if (iter
++ >= *ppos
)
1840 /* ID tracker disabled. */
1841 if (iter
>= *ppos
&& iter
== 0)
1842 return p
; /* empty tracker */
1851 void id_list_stop(struct seq_file
*m
, void *p
)
1853 mutex_unlock(&sessions_mutex
);
1857 int id_list_show(struct seq_file
*m
, void *p
)
1859 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1860 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1863 if (p
== id_tracker_p
) {
1864 /* Tracker disabled. */
1867 const struct lttng_id_hash_node
*e
= p
;
1869 id
= lttng_id_tracker_get_node_id(e
);
1871 switch (id_tracker
->priv
->tracker_type
) {
1873 seq_printf(m
, "process { pid = %d; };\n", id
);
1876 seq_printf(m
, "process { vpid = %d; };\n", id
);
1879 seq_printf(m
, "user { uid = %d; };\n", id
);
1882 seq_printf(m
, "user { vuid = %d; };\n", id
);
1885 seq_printf(m
, "group { gid = %d; };\n", id
);
1888 seq_printf(m
, "group { vgid = %d; };\n", id
);
1891 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1897 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1898 .start
= id_list_start
,
1899 .next
= id_list_next
,
1900 .stop
= id_list_stop
,
1901 .show
= id_list_show
,
1905 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1907 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1911 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1913 struct seq_file
*m
= file
->private_data
;
1914 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1917 WARN_ON_ONCE(!id_tracker
);
1918 ret
= seq_release(inode
, file
);
1920 fput(id_tracker
->priv
->session
->priv
->file
);
1924 const struct file_operations lttng_tracker_ids_list_fops
= {
1925 .owner
= THIS_MODULE
,
1926 .open
= lttng_tracker_ids_list_open
,
1928 .llseek
= seq_lseek
,
1929 .release
= lttng_tracker_ids_list_release
,
1932 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1933 enum tracker_type tracker_type
)
1935 struct file
*tracker_ids_list_file
;
1939 file_fd
= lttng_get_unused_fd();
1945 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1946 <tng_tracker_ids_list_fops
,
1948 if (IS_ERR(tracker_ids_list_file
)) {
1949 ret
= PTR_ERR(tracker_ids_list_file
);
1952 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1954 goto refcount_error
;
1956 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1959 m
= tracker_ids_list_file
->private_data
;
1961 m
->private = get_tracker(session
, tracker_type
);
1962 BUG_ON(!m
->private);
1963 fd_install(file_fd
, tracker_ids_list_file
);
1968 atomic_long_dec(&session
->priv
->file
->f_count
);
1970 fput(tracker_ids_list_file
);
1972 put_unused_fd(file_fd
);
1978 * Enabler management.
1981 int lttng_match_enabler_star_glob(const char *desc_name
,
1982 const char *pattern
)
1984 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1985 desc_name
, LTTNG_SIZE_MAX
))
1991 int lttng_match_enabler_name(const char *desc_name
,
1994 if (strcmp(desc_name
, name
))
2000 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
2001 struct lttng_event_enabler_common
*enabler
)
2003 const char *desc_name
, *enabler_name
;
2004 bool compat
= false, entry
= false;
2006 enabler_name
= enabler
->event_param
.name
;
2007 switch (enabler
->event_param
.instrumentation
) {
2008 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2009 desc_name
= desc
->event_name
;
2010 switch (enabler
->format_type
) {
2011 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2012 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2013 case LTTNG_ENABLER_FORMAT_NAME
:
2014 return lttng_match_enabler_name(desc_name
, enabler_name
);
2020 case LTTNG_KERNEL_ABI_SYSCALL
:
2021 desc_name
= desc
->event_name
;
2022 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2023 desc_name
+= strlen("compat_");
2026 if (!strncmp(desc_name
, "syscall_exit_",
2027 strlen("syscall_exit_"))) {
2028 desc_name
+= strlen("syscall_exit_");
2029 } else if (!strncmp(desc_name
, "syscall_entry_",
2030 strlen("syscall_entry_"))) {
2031 desc_name
+= strlen("syscall_entry_");
2037 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2038 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2040 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2044 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2051 switch (enabler
->event_param
.u
.syscall
.abi
) {
2052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2054 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2058 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2065 switch (enabler
->event_param
.u
.syscall
.match
) {
2066 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2067 switch (enabler
->format_type
) {
2068 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2069 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2070 case LTTNG_ENABLER_FORMAT_NAME
:
2071 return lttng_match_enabler_name(desc_name
, enabler_name
);
2076 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2077 return -EINVAL
; /* Not implemented. */
2089 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2090 struct lttng_event_enabler_common
*enabler
)
2094 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2102 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2103 struct lttng_kernel_event_common
*event
)
2105 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2108 switch (event_enabler
->enabler_type
) {
2109 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2111 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2112 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2113 struct lttng_kernel_event_recorder
*event_recorder
=
2114 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2116 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2117 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2122 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2124 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2125 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2126 struct lttng_kernel_event_notifier
*event_notifier
=
2127 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2129 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2130 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2131 && event
->priv
->user_token
== event_enabler
->user_token
)
2142 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2143 const struct lttng_kernel_event_desc
*desc
,
2144 struct lttng_kernel_event_common
*event
)
2146 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2149 switch (event_enabler
->enabler_type
) {
2150 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2152 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2153 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2154 struct lttng_kernel_event_recorder
*event_recorder
=
2155 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2157 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2162 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2164 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2165 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2166 struct lttng_kernel_event_notifier
*event_notifier
=
2167 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2169 if (event
->priv
->desc
== desc
2170 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2171 && event
->priv
->user_token
== event_enabler
->user_token
)
2182 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2183 const char *event_name
,
2184 struct lttng_kernel_event_common
*event
)
2186 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2189 switch (event_enabler
->enabler_type
) {
2190 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2192 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2193 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2194 struct lttng_kernel_event_recorder
*event_recorder
=
2195 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2197 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2198 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2203 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2205 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2206 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2207 struct lttng_kernel_event_notifier
*event_notifier
=
2208 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2210 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2211 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2212 && event
->priv
->user_token
== event_enabler
->user_token
)
2224 struct lttng_enabler_ref
*lttng_enabler_ref(
2225 struct list_head
*enablers_ref_list
,
2226 struct lttng_event_enabler_common
*enabler
)
2228 struct lttng_enabler_ref
*enabler_ref
;
2230 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2231 if (enabler_ref
->ref
== enabler
)
2238 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2240 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2241 struct lttng_kernel_probe_desc
*probe_desc
;
2242 const struct lttng_kernel_event_desc
*desc
;
2243 struct list_head
*probe_list
;
2246 probe_list
= lttng_get_probe_list_head();
2248 * For each probe event, if we find that a probe event matches
2249 * our enabler, create an associated lttng_event if not
2252 list_for_each_entry(probe_desc
, probe_list
, head
) {
2253 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2255 struct hlist_head
*head
;
2256 struct lttng_kernel_event_common
*event
;
2257 struct lttng_kernel_event_common_private
*event_priv
;
2259 desc
= probe_desc
->event_desc
[i
];
2260 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2264 * Check if already created.
2266 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2267 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2268 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2275 * We need to create an event for this event probe.
2277 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2279 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2280 probe_desc
->event_desc
[i
]->event_name
);
2287 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2291 ret
= lttng_syscalls_register_event(event_enabler
);
2296 * Create event if it is missing and present in the list of tracepoint probes.
2297 * Should be called with sessions mutex held.
2300 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2302 switch (event_enabler
->event_param
.instrumentation
) {
2303 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2304 lttng_create_tracepoint_event_if_missing(event_enabler
);
2307 case LTTNG_KERNEL_ABI_SYSCALL
:
2308 lttng_create_syscall_event_if_missing(event_enabler
);
2318 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2319 struct lttng_kernel_event_common
*event
)
2321 /* Link filter bytecodes if not linked yet. */
2322 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2323 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2327 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2328 struct lttng_kernel_event_common
*event
)
2330 switch (event_enabler
->enabler_type
) {
2331 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2333 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2335 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2336 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2337 struct lttng_kernel_event_notifier
*event_notifier
=
2338 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2340 /* Link capture bytecodes if not linked yet. */
2341 lttng_enabler_link_bytecode(event
->priv
->desc
,
2342 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2343 &event_notifier_enabler
->capture_bytecode_head
);
2344 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2353 * Create events associated with an event_enabler (if not already present),
2354 * and add backward reference from the event to the enabler.
2355 * Should be called with sessions mutex held.
2358 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2360 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2361 struct lttng_kernel_event_common_private
*event_priv
;
2363 lttng_syscall_table_set_wildcard_all(event_enabler
);
2365 /* First ensure that probe events are created for this enabler. */
2366 lttng_create_event_if_missing(event_enabler
);
2368 /* Link the created event with its associated enabler. */
2369 list_for_each_entry(event_priv
, event_list_head
, node
) {
2370 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2371 struct lttng_enabler_ref
*enabler_ref
;
2373 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2376 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2379 * If no backward ref, create it.
2380 * Add backward ref from event_notifier to enabler.
2382 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2386 enabler_ref
->ref
= event_enabler
;
2387 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2390 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2391 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2397 * Called at module load: connect the probe on all enablers matching
2399 * Called with sessions lock held.
2401 int lttng_fix_pending_events(void)
2403 struct lttng_kernel_session_private
*session_priv
;
2405 list_for_each_entry(session_priv
, &sessions
, list
)
2406 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2410 static bool lttng_event_notifier_group_has_active_event_notifiers(
2411 struct lttng_event_notifier_group
*event_notifier_group
)
2413 struct lttng_event_enabler_common
*event_enabler
;
2415 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2416 if (event_enabler
->enabled
)
2422 bool lttng_event_notifier_active(void)
2424 struct lttng_event_notifier_group
*event_notifier_group
;
2426 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2427 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2433 int lttng_fix_pending_event_notifiers(void)
2435 struct lttng_event_notifier_group
*event_notifier_group
;
2437 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2438 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2442 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2443 enum lttng_enabler_format_type format_type
,
2444 struct lttng_kernel_abi_event
*event_param
,
2445 struct lttng_kernel_channel_buffer
*chan
)
2447 struct lttng_event_recorder_enabler
*event_enabler
;
2449 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2452 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2453 event_enabler
->parent
.format_type
= format_type
;
2454 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2455 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2456 sizeof(event_enabler
->parent
.event_param
));
2457 event_enabler
->chan
= chan
;
2459 event_enabler
->parent
.enabled
= 0;
2460 return event_enabler
;
2463 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2464 struct lttng_event_recorder_enabler
*event_enabler
)
2466 mutex_lock(&sessions_mutex
);
2467 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2468 event_enabler
->parent
.published
= true;
2469 lttng_session_lazy_sync_event_enablers(session
);
2470 mutex_unlock(&sessions_mutex
);
2473 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2475 mutex_lock(&sessions_mutex
);
2476 event_enabler
->enabled
= 1;
2477 lttng_event_enabler_sync(event_enabler
);
2478 mutex_unlock(&sessions_mutex
);
2482 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2484 mutex_lock(&sessions_mutex
);
2485 event_enabler
->enabled
= 0;
2486 lttng_event_enabler_sync(event_enabler
);
2487 mutex_unlock(&sessions_mutex
);
2492 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2493 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2495 struct lttng_kernel_bytecode_node
*bytecode_node
;
2496 uint32_t bytecode_len
;
2499 ret
= get_user(bytecode_len
, &bytecode
->len
);
2502 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2506 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2507 sizeof(*bytecode
) + bytecode_len
);
2511 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2512 bytecode_node
->enabler
= enabler
;
2513 /* Enforce length based on allocated size */
2514 bytecode_node
->bc
.len
= bytecode_len
;
2515 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2520 lttng_kvfree(bytecode_node
);
2524 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2525 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2528 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2531 lttng_event_enabler_sync(event_enabler
);
2538 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2539 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2542 switch (event
->priv
->instrumentation
) {
2543 case LTTNG_KERNEL_ABI_UPROBE
:
2544 return lttng_uprobes_event_add_callsite(event
, callsite
);
2551 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2553 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2555 /* Destroy filter bytecode */
2556 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2557 &enabler
->filter_bytecode_head
, node
) {
2558 lttng_kvfree(filter_node
);
2562 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2564 lttng_enabler_destroy(event_enabler
);
2565 if (event_enabler
->published
)
2566 list_del(&event_enabler
->node
);
2568 switch (event_enabler
->enabler_type
) {
2569 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2571 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2572 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2574 kfree(event_recorder_enabler
);
2577 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2579 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2580 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2582 kfree(event_notifier_enabler
);
2590 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2591 enum lttng_enabler_format_type format_type
,
2592 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2593 struct lttng_event_notifier_group
*event_notifier_group
)
2595 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2597 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2598 if (!event_notifier_enabler
)
2601 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2602 event_notifier_enabler
->parent
.format_type
= format_type
;
2603 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2604 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2606 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2607 event_notifier_enabler
->num_captures
= 0;
2609 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2610 sizeof(event_notifier_enabler
->parent
.event_param
));
2612 event_notifier_enabler
->parent
.enabled
= 0;
2613 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2614 event_notifier_enabler
->group
= event_notifier_group
;
2615 return event_notifier_enabler
;
2618 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2619 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2621 mutex_lock(&sessions_mutex
);
2622 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2623 event_notifier_enabler
->parent
.published
= true;
2624 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2625 mutex_unlock(&sessions_mutex
);
2628 int lttng_event_notifier_enabler_enable(
2629 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2631 mutex_lock(&sessions_mutex
);
2632 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2633 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2634 mutex_unlock(&sessions_mutex
);
2638 int lttng_event_notifier_enabler_disable(
2639 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2641 mutex_lock(&sessions_mutex
);
2642 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2643 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2644 mutex_unlock(&sessions_mutex
);
2648 int lttng_event_notifier_enabler_attach_capture_bytecode(
2649 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2650 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2652 struct lttng_kernel_bytecode_node
*bytecode_node
;
2653 struct lttng_event_enabler_common
*enabler
=
2654 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2655 uint32_t bytecode_len
;
2658 ret
= get_user(bytecode_len
, &bytecode
->len
);
2662 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2667 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2668 sizeof(*bytecode
) + bytecode_len
);
2672 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2673 bytecode_node
->enabler
= enabler
;
2675 /* Enforce length based on allocated size */
2676 bytecode_node
->bc
.len
= bytecode_len
;
2677 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2679 event_notifier_enabler
->num_captures
++;
2681 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2685 lttng_kvfree(bytecode_node
);
2691 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2693 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2694 struct lttng_kernel_bytecode_runtime
*runtime
;
2695 struct lttng_enabler_ref
*enabler_ref
;
2697 /* Check if has enablers without bytecode enabled */
2698 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2699 if (enabler_ref
->ref
->enabled
2700 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2701 has_enablers_without_filter_bytecode
= 1;
2705 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2707 /* Enable filters */
2708 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2709 lttng_bytecode_sync_state(runtime
);
2712 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2716 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2718 switch (event
->type
) {
2719 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2723 struct lttng_kernel_event_notifier
*event_notifier
=
2724 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2725 struct lttng_kernel_bytecode_runtime
*runtime
;
2726 int nr_captures
= 0;
2728 /* Enable captures */
2729 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2730 lttng_bytecode_sync_state(runtime
);
2733 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2742 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2744 struct lttng_enabler_ref
*enabler_ref
;
2745 bool enabled
= false;
2747 switch (event
->priv
->instrumentation
) {
2748 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2750 case LTTNG_KERNEL_ABI_SYSCALL
:
2752 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2753 if (enabler_ref
->ref
->enabled
) {
2764 switch (event
->type
) {
2765 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2767 struct lttng_kernel_event_recorder
*event_recorder
=
2768 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2771 * Enabled state is based on union of enablers, with
2772 * intersection of session and channel transient enable
2775 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2777 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2786 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2788 switch (event
->priv
->instrumentation
) {
2789 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2791 case LTTNG_KERNEL_ABI_SYSCALL
:
2795 /* Not handled with lazy sync. */
2801 * Should be called with sessions mutex held.
2804 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2805 struct list_head
*event_list
)
2807 struct lttng_kernel_event_common_private
*event_priv
;
2808 struct lttng_event_enabler_common
*event_enabler
;
2810 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2811 lttng_event_enabler_ref_events(event_enabler
);
2814 * For each event, if at least one of its enablers is enabled,
2815 * and its channel and session transient states are enabled, we
2816 * enable the event, else we disable it.
2818 list_for_each_entry(event_priv
, event_list
, node
) {
2819 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2822 if (!lttng_event_is_lazy_sync(event
))
2825 enabled
= lttng_get_event_enabled_state(event
);
2826 WRITE_ONCE(event
->enabled
, enabled
);
2828 * Sync tracepoint registration with event enabled state.
2831 register_event(event
);
2833 _lttng_event_unregister(event
);
2836 lttng_event_sync_filter_state(event
);
2837 lttng_event_sync_capture_state(event
);
2842 * lttng_session_sync_event_enablers should be called just before starting a
2846 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2848 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2852 * Apply enablers to session events, adding events to session if need
2853 * be. It is required after each modification applied to an active
2854 * session, and right before session "start".
2855 * "lazy" sync means we only sync if required.
2856 * Should be called with sessions mutex held.
2859 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2861 /* We can skip if session is not active */
2862 if (!session
->active
)
2864 lttng_session_sync_event_enablers(session
);
2868 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2870 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2874 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2876 switch (event_enabler
->enabler_type
) {
2877 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2879 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2880 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2881 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2884 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2886 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2887 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2888 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2897 * Serialize at most one packet worth of metadata into a metadata
2899 * We grab the metadata cache mutex to get exclusive access to our metadata
2900 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2901 * allows us to do racy operations such as looking for remaining space left in
2902 * packet and write, since mutual exclusion protects us from concurrent writes.
2903 * Mutual exclusion on the metadata cache allow us to read the cache content
2904 * without racing against reallocation of the cache by updates.
2905 * Returns the number of bytes written in the channel, 0 if no data
2906 * was written and a negative value on error.
2908 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2909 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2911 struct lttng_kernel_ring_buffer_ctx ctx
;
2913 size_t len
, reserve_len
;
2916 * Ensure we support mutiple get_next / put sequences followed by
2917 * put_next. The metadata cache lock protects reading the metadata
2918 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2919 * "flush" operations on the buffer invoked by different processes.
2920 * Moreover, since the metadata cache memory can be reallocated, we
2921 * need to have exclusive access against updates even though we only
2924 mutex_lock(&stream
->metadata_cache
->lock
);
2925 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2926 if (stream
->metadata_in
!= stream
->metadata_out
)
2929 /* Metadata regenerated, change the version. */
2930 if (stream
->metadata_cache
->version
!= stream
->version
)
2931 stream
->version
= stream
->metadata_cache
->version
;
2933 len
= stream
->metadata_cache
->metadata_written
-
2934 stream
->metadata_in
;
2937 reserve_len
= min_t(size_t,
2938 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2940 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2941 sizeof(char), NULL
);
2943 * If reservation failed, return an error to the caller.
2945 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2947 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2948 stream
->coherent
= false;
2951 stream
->transport
->ops
.event_write(&ctx
,
2952 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2954 stream
->transport
->ops
.event_commit(&ctx
);
2955 stream
->metadata_in
+= reserve_len
;
2956 if (reserve_len
< len
)
2957 stream
->coherent
= false;
2959 stream
->coherent
= true;
2964 *coherent
= stream
->coherent
;
2965 mutex_unlock(&stream
->metadata_cache
->lock
);
2970 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2972 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2973 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2977 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2979 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2980 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2981 struct lttng_metadata_stream
*stream
;
2983 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2984 wake_up_interruptible(&stream
->read_wait
);
2985 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2990 * Write the metadata to the metadata cache.
2991 * Must be called with sessions_mutex held.
2992 * The metadata cache lock protects us from concurrent read access from
2993 * thread outputting metadata content to ring buffer.
2994 * The content of the printf is printed as a single atomic metadata
2997 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2998 const char *fmt
, ...)
3004 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3007 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3013 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3014 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3015 session
->priv
->metadata_cache
->cache_alloc
) {
3016 char *tmp_cache_realloc
;
3017 unsigned int tmp_cache_alloc_size
;
3019 tmp_cache_alloc_size
= max_t(unsigned int,
3020 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3021 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3022 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3023 if (!tmp_cache_realloc
)
3025 if (session
->priv
->metadata_cache
->data
) {
3026 memcpy(tmp_cache_realloc
,
3027 session
->priv
->metadata_cache
->data
,
3028 session
->priv
->metadata_cache
->cache_alloc
);
3029 vfree(session
->priv
->metadata_cache
->data
);
3032 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3033 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3035 memcpy(session
->priv
->metadata_cache
->data
+
3036 session
->priv
->metadata_cache
->metadata_written
,
3038 session
->priv
->metadata_cache
->metadata_written
+= len
;
3049 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3053 for (i
= 0; i
< nesting
; i
++) {
3056 ret
= lttng_metadata_printf(session
, " ");
3065 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3066 const struct lttng_kernel_event_field
*field
,
3069 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3073 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3074 const struct lttng_kernel_type_integer
*type
,
3075 enum lttng_kernel_string_encoding parent_encoding
,
3080 ret
= print_tabs(session
, nesting
);
3083 ret
= lttng_metadata_printf(session
,
3084 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3088 (parent_encoding
== lttng_kernel_string_encoding_none
)
3090 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3094 #if __BYTE_ORDER == __BIG_ENDIAN
3095 type
->reverse_byte_order
? " byte_order = le;" : ""
3097 type
->reverse_byte_order
? " byte_order = be;" : ""
3104 * Must be called with sessions_mutex held.
3107 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3108 const struct lttng_kernel_type_struct
*type
,
3111 const char *prev_field_name
= NULL
;
3113 uint32_t i
, nr_fields
;
3114 unsigned int alignment
;
3116 ret
= print_tabs(session
, nesting
);
3119 ret
= lttng_metadata_printf(session
,
3123 nr_fields
= type
->nr_fields
;
3124 for (i
= 0; i
< nr_fields
; i
++) {
3125 const struct lttng_kernel_event_field
*iter_field
;
3127 iter_field
= type
->fields
[i
];
3128 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3132 ret
= print_tabs(session
, nesting
);
3135 alignment
= type
->alignment
;
3137 ret
= lttng_metadata_printf(session
,
3141 ret
= lttng_metadata_printf(session
,
3148 * Must be called with sessions_mutex held.
3151 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3152 const struct lttng_kernel_event_field
*field
,
3157 ret
= _lttng_struct_type_statedump(session
,
3158 lttng_kernel_get_type_struct(field
->type
), nesting
);
3161 return lttng_field_name_statedump(session
, field
, nesting
);
3165 * Must be called with sessions_mutex held.
3168 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3169 const struct lttng_kernel_type_variant
*type
,
3171 const char *prev_field_name
)
3173 const char *tag_name
;
3175 uint32_t i
, nr_choices
;
3177 tag_name
= type
->tag_name
;
3179 tag_name
= prev_field_name
;
3183 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3185 if (type
->alignment
!= 0)
3187 ret
= print_tabs(session
, nesting
);
3190 ret
= lttng_metadata_printf(session
,
3191 "variant <_%s> {\n",
3195 nr_choices
= type
->nr_choices
;
3196 for (i
= 0; i
< nr_choices
; i
++) {
3197 const struct lttng_kernel_event_field
*iter_field
;
3199 iter_field
= type
->choices
[i
];
3200 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3204 ret
= print_tabs(session
, nesting
);
3207 ret
= lttng_metadata_printf(session
,
3213 * Must be called with sessions_mutex held.
3216 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3217 const struct lttng_kernel_event_field
*field
,
3219 const char *prev_field_name
)
3223 ret
= _lttng_variant_type_statedump(session
,
3224 lttng_kernel_get_type_variant(field
->type
), nesting
,
3228 return lttng_field_name_statedump(session
, field
, nesting
);
3232 * Must be called with sessions_mutex held.
3235 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3236 const struct lttng_kernel_event_field
*field
,
3240 const struct lttng_kernel_type_array
*array_type
;
3241 const struct lttng_kernel_type_common
*elem_type
;
3243 array_type
= lttng_kernel_get_type_array(field
->type
);
3244 WARN_ON_ONCE(!array_type
);
3246 if (array_type
->alignment
) {
3247 ret
= print_tabs(session
, nesting
);
3250 ret
= lttng_metadata_printf(session
,
3251 "struct { } align(%u) _%s_padding;\n",
3252 array_type
->alignment
* CHAR_BIT
,
3258 * Nested compound types: Only array of structures and variants are
3259 * currently supported.
3261 elem_type
= array_type
->elem_type
;
3262 switch (elem_type
->type
) {
3263 case lttng_kernel_type_integer
:
3264 case lttng_kernel_type_struct
:
3265 case lttng_kernel_type_variant
:
3266 ret
= _lttng_type_statedump(session
, elem_type
,
3267 array_type
->encoding
, nesting
);
3275 ret
= lttng_metadata_printf(session
,
3278 array_type
->length
);
3283 * Must be called with sessions_mutex held.
3286 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3287 const struct lttng_kernel_event_field
*field
,
3289 const char *prev_field_name
)
3292 const char *length_name
;
3293 const struct lttng_kernel_type_sequence
*sequence_type
;
3294 const struct lttng_kernel_type_common
*elem_type
;
3296 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3297 WARN_ON_ONCE(!sequence_type
);
3299 length_name
= sequence_type
->length_name
;
3301 length_name
= prev_field_name
;
3305 if (sequence_type
->alignment
) {
3306 ret
= print_tabs(session
, nesting
);
3309 ret
= lttng_metadata_printf(session
,
3310 "struct { } align(%u) _%s_padding;\n",
3311 sequence_type
->alignment
* CHAR_BIT
,
3318 * Nested compound types: Only array of structures and variants are
3319 * currently supported.
3321 elem_type
= sequence_type
->elem_type
;
3322 switch (elem_type
->type
) {
3323 case lttng_kernel_type_integer
:
3324 case lttng_kernel_type_struct
:
3325 case lttng_kernel_type_variant
:
3326 ret
= _lttng_type_statedump(session
, elem_type
,
3327 sequence_type
->encoding
, nesting
);
3335 ret
= lttng_metadata_printf(session
,
3343 * Must be called with sessions_mutex held.
3346 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3347 const struct lttng_kernel_type_enum
*type
,
3350 const struct lttng_kernel_enum_desc
*enum_desc
;
3351 const struct lttng_kernel_type_common
*container_type
;
3353 unsigned int i
, nr_entries
;
3355 container_type
= type
->container_type
;
3356 if (container_type
->type
!= lttng_kernel_type_integer
) {
3360 enum_desc
= type
->desc
;
3361 nr_entries
= enum_desc
->nr_entries
;
3363 ret
= print_tabs(session
, nesting
);
3366 ret
= lttng_metadata_printf(session
, "enum : ");
3369 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3370 lttng_kernel_string_encoding_none
, 0);
3373 ret
= lttng_metadata_printf(session
, " {\n");
3376 /* Dump all entries */
3377 for (i
= 0; i
< nr_entries
; i
++) {
3378 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3381 ret
= print_tabs(session
, nesting
+ 1);
3384 ret
= lttng_metadata_printf(session
,
3388 len
= strlen(entry
->string
);
3389 /* Escape the character '"' */
3390 for (j
= 0; j
< len
; j
++) {
3391 char c
= entry
->string
[j
];
3395 ret
= lttng_metadata_printf(session
,
3399 ret
= lttng_metadata_printf(session
,
3403 ret
= lttng_metadata_printf(session
,
3410 ret
= lttng_metadata_printf(session
, "\"");
3414 if (entry
->options
.is_auto
) {
3415 ret
= lttng_metadata_printf(session
, ",\n");
3419 ret
= lttng_metadata_printf(session
,
3423 if (entry
->start
.signedness
)
3424 ret
= lttng_metadata_printf(session
,
3425 "%lld", (long long) entry
->start
.value
);
3427 ret
= lttng_metadata_printf(session
,
3428 "%llu", entry
->start
.value
);
3431 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3433 == entry
->end
.value
) {
3434 ret
= lttng_metadata_printf(session
,
3437 if (entry
->end
.signedness
) {
3438 ret
= lttng_metadata_printf(session
,
3440 (long long) entry
->end
.value
);
3442 ret
= lttng_metadata_printf(session
,
3451 ret
= print_tabs(session
, nesting
);
3454 ret
= lttng_metadata_printf(session
, "}");
3460 * Must be called with sessions_mutex held.
3463 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3464 const struct lttng_kernel_event_field
*field
,
3468 const struct lttng_kernel_type_enum
*enum_type
;
3470 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3471 WARN_ON_ONCE(!enum_type
);
3472 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3475 return lttng_field_name_statedump(session
, field
, nesting
);
3479 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3480 const struct lttng_kernel_event_field
*field
,
3485 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3486 lttng_kernel_string_encoding_none
, nesting
);
3489 return lttng_field_name_statedump(session
, field
, nesting
);
3493 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3494 const struct lttng_kernel_type_string
*type
,
3499 /* Default encoding is UTF8 */
3500 ret
= print_tabs(session
, nesting
);
3503 ret
= lttng_metadata_printf(session
,
3505 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3506 " { encoding = ASCII; }" : "");
3511 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3512 const struct lttng_kernel_event_field
*field
,
3515 const struct lttng_kernel_type_string
*string_type
;
3518 string_type
= lttng_kernel_get_type_string(field
->type
);
3519 WARN_ON_ONCE(!string_type
);
3520 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3523 return lttng_field_name_statedump(session
, field
, nesting
);
3527 * Must be called with sessions_mutex held.
3530 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3531 const struct lttng_kernel_type_common
*type
,
3532 enum lttng_kernel_string_encoding parent_encoding
,
3537 switch (type
->type
) {
3538 case lttng_kernel_type_integer
:
3539 ret
= _lttng_integer_type_statedump(session
,
3540 lttng_kernel_get_type_integer(type
),
3541 parent_encoding
, nesting
);
3543 case lttng_kernel_type_enum
:
3544 ret
= _lttng_enum_type_statedump(session
,
3545 lttng_kernel_get_type_enum(type
),
3548 case lttng_kernel_type_string
:
3549 ret
= _lttng_string_type_statedump(session
,
3550 lttng_kernel_get_type_string(type
),
3553 case lttng_kernel_type_struct
:
3554 ret
= _lttng_struct_type_statedump(session
,
3555 lttng_kernel_get_type_struct(type
),
3558 case lttng_kernel_type_variant
:
3559 ret
= _lttng_variant_type_statedump(session
,
3560 lttng_kernel_get_type_variant(type
),
3564 /* Nested arrays and sequences are not supported yet. */
3565 case lttng_kernel_type_array
:
3566 case lttng_kernel_type_sequence
:
3575 * Must be called with sessions_mutex held.
3578 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3579 const struct lttng_kernel_event_field
*field
,
3581 const char **prev_field_name_p
)
3583 const char *prev_field_name
= NULL
;
3586 if (prev_field_name_p
)
3587 prev_field_name
= *prev_field_name_p
;
3588 switch (field
->type
->type
) {
3589 case lttng_kernel_type_integer
:
3590 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3592 case lttng_kernel_type_enum
:
3593 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3595 case lttng_kernel_type_string
:
3596 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3598 case lttng_kernel_type_struct
:
3599 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3601 case lttng_kernel_type_array
:
3602 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3604 case lttng_kernel_type_sequence
:
3605 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3607 case lttng_kernel_type_variant
:
3608 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3615 if (prev_field_name_p
)
3616 *prev_field_name_p
= field
->name
;
3621 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3622 struct lttng_kernel_ctx
*ctx
)
3624 const char *prev_field_name
= NULL
;
3630 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3631 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3633 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3641 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3642 struct lttng_kernel_event_recorder
*event_recorder
)
3644 const char *prev_field_name
= NULL
;
3645 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3649 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3650 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3652 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3660 * Must be called with sessions_mutex held.
3661 * The entire event metadata is printed as a single atomic metadata
3665 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3667 struct lttng_kernel_event_recorder
*event_recorder
;
3668 struct lttng_kernel_channel_buffer
*chan
;
3669 struct lttng_kernel_session
*session
;
3672 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3674 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3675 chan
= event_recorder
->chan
;
3676 session
= chan
->parent
.session
;
3678 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3680 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3683 lttng_metadata_begin(session
);
3685 ret
= lttng_metadata_printf(session
,
3689 " stream_id = %u;\n",
3690 event_recorder
->priv
->parent
.desc
->event_name
,
3691 event_recorder
->priv
->id
,
3692 event_recorder
->chan
->priv
->id
);
3696 ret
= lttng_metadata_printf(session
,
3697 " fields := struct {\n"
3702 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3707 * LTTng space reservation can only reserve multiples of the
3710 ret
= lttng_metadata_printf(session
,
3716 event_recorder
->priv
->metadata_dumped
= 1;
3718 lttng_metadata_end(session
);
3724 * Must be called with sessions_mutex held.
3725 * The entire channel metadata is printed as a single atomic metadata
3729 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3730 struct lttng_kernel_channel_buffer
*chan
)
3734 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3737 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3740 lttng_metadata_begin(session
);
3742 WARN_ON_ONCE(!chan
->priv
->header_type
);
3743 ret
= lttng_metadata_printf(session
,
3746 " event.header := %s;\n"
3747 " packet.context := struct packet_context;\n",
3749 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3750 "struct event_header_large");
3754 if (chan
->priv
->ctx
) {
3755 ret
= lttng_metadata_printf(session
,
3756 " event.context := struct {\n");
3760 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3763 if (chan
->priv
->ctx
) {
3764 ret
= lttng_metadata_printf(session
,
3770 ret
= lttng_metadata_printf(session
,
3773 chan
->priv
->metadata_dumped
= 1;
3775 lttng_metadata_end(session
);
3780 * Must be called with sessions_mutex held.
3783 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3785 return lttng_metadata_printf(session
,
3786 "struct packet_context {\n"
3787 " uint64_clock_monotonic_t timestamp_begin;\n"
3788 " uint64_clock_monotonic_t timestamp_end;\n"
3789 " uint64_t content_size;\n"
3790 " uint64_t packet_size;\n"
3791 " uint64_t packet_seq_num;\n"
3792 " unsigned long events_discarded;\n"
3793 " uint32_t cpu_id;\n"
3800 * id: range: 0 - 30.
3801 * id 31 is reserved to indicate an extended header.
3804 * id: range: 0 - 65534.
3805 * id 65535 is reserved to indicate an extended header.
3807 * Must be called with sessions_mutex held.
3810 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3812 return lttng_metadata_printf(session
,
3813 "struct event_header_compact {\n"
3814 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3817 " uint27_clock_monotonic_t timestamp;\n"
3821 " uint64_clock_monotonic_t timestamp;\n"
3826 "struct event_header_large {\n"
3827 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3830 " uint32_clock_monotonic_t timestamp;\n"
3834 " uint64_clock_monotonic_t timestamp;\n"
3838 lttng_alignof(uint32_t) * CHAR_BIT
,
3839 lttng_alignof(uint16_t) * CHAR_BIT
3844 * Approximation of NTP time of day to clock monotonic correlation,
3845 * taken at start of trace.
3846 * Yes, this is only an approximation. Yes, we can (and will) do better
3847 * in future versions.
3848 * This function may return a negative offset. It may happen if the
3849 * system sets the REALTIME clock to 0 after boot.
3851 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3855 int64_t measure_clock_offset(void)
3857 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3858 uint64_t tcf
= trace_clock_freq();
3860 unsigned long flags
;
3861 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3862 struct timespec64 rts
= { 0, 0 };
3864 struct timespec rts
= { 0, 0 };
3867 /* Disable interrupts to increase correlation precision. */
3868 local_irq_save(flags
);
3869 monotonic
[0] = trace_clock_read64();
3870 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3871 ktime_get_real_ts64(&rts
);
3873 getnstimeofday(&rts
);
3875 monotonic
[1] = trace_clock_read64();
3876 local_irq_restore(flags
);
3878 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3879 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3880 if (tcf
== NSEC_PER_SEC
) {
3881 realtime
+= rts
.tv_nsec
;
3883 uint64_t n
= rts
.tv_nsec
* tcf
;
3885 do_div(n
, NSEC_PER_SEC
);
3888 offset
= (int64_t) realtime
- monotonic_avg
;
3893 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3901 while (cur
!= '\0') {
3904 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3908 ret
= lttng_metadata_printf(session
, "%c", '\\');
3911 /* We still print the current char */
3914 ret
= lttng_metadata_printf(session
, "%c", cur
);
3928 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3929 const char *field_value
)
3933 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3937 ret
= print_escaped_ctf_string(session
, field_value
);
3941 ret
= lttng_metadata_printf(session
, "\";\n");
3948 * Output metadata into this session's metadata buffers.
3949 * Must be called with sessions_mutex held.
3952 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3954 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3955 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3956 const char *product_uuid
;
3957 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3958 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3961 if (!LTTNG_READ_ONCE(session
->active
))
3964 lttng_metadata_begin(session
);
3966 if (session
->priv
->metadata_dumped
)
3969 snprintf(uuid_s
, sizeof(uuid_s
),
3970 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3971 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3972 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3973 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3974 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3976 ret
= lttng_metadata_printf(session
,
3977 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3978 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3979 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3980 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3981 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3982 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3983 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3989 " byte_order = %s;\n"
3990 " packet.header := struct {\n"
3991 " uint32_t magic;\n"
3992 " uint8_t uuid[16];\n"
3993 " uint32_t stream_id;\n"
3994 " uint64_t stream_instance_id;\n"
3997 lttng_alignof(uint8_t) * CHAR_BIT
,
3998 lttng_alignof(uint16_t) * CHAR_BIT
,
3999 lttng_alignof(uint32_t) * CHAR_BIT
,
4000 lttng_alignof(uint64_t) * CHAR_BIT
,
4001 sizeof(unsigned long) * CHAR_BIT
,
4002 lttng_alignof(unsigned long) * CHAR_BIT
,
4006 #if __BYTE_ORDER == __BIG_ENDIAN
4015 ret
= lttng_metadata_printf(session
,
4017 " hostname = \"%s\";\n"
4018 " domain = \"kernel\";\n"
4019 " sysname = \"%s\";\n"
4020 " kernel_release = \"%s\";\n"
4021 " kernel_version = \"%s\";\n"
4022 " tracer_name = \"lttng-modules\";\n"
4023 " tracer_major = %d;\n"
4024 " tracer_minor = %d;\n"
4025 " tracer_patchlevel = %d;\n"
4026 " trace_buffering_scheme = \"global\";\n",
4027 current
->nsproxy
->uts_ns
->name
.nodename
,
4031 LTTNG_MODULES_MAJOR_VERSION
,
4032 LTTNG_MODULES_MINOR_VERSION
,
4033 LTTNG_MODULES_PATCHLEVEL_VERSION
4038 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4041 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4042 session
->priv
->creation_time
);
4046 /* Add the product UUID to the 'env' section */
4047 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4049 ret
= lttng_metadata_printf(session
,
4050 " product_uuid = \"%s\";\n",
4057 /* Close the 'env' section */
4058 ret
= lttng_metadata_printf(session
, "};\n\n");
4062 ret
= lttng_metadata_printf(session
,
4064 " name = \"%s\";\n",
4070 if (!trace_clock_uuid(clock_uuid_s
)) {
4071 ret
= lttng_metadata_printf(session
,
4072 " uuid = \"%s\";\n",
4079 ret
= lttng_metadata_printf(session
,
4080 " description = \"%s\";\n"
4081 " freq = %llu; /* Frequency, in Hz */\n"
4082 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4085 trace_clock_description(),
4086 (unsigned long long) trace_clock_freq(),
4087 (long long) measure_clock_offset()
4092 ret
= lttng_metadata_printf(session
,
4093 "typealias integer {\n"
4094 " size = 27; align = 1; signed = false;\n"
4095 " map = clock.%s.value;\n"
4096 "} := uint27_clock_monotonic_t;\n"
4098 "typealias integer {\n"
4099 " size = 32; align = %u; signed = false;\n"
4100 " map = clock.%s.value;\n"
4101 "} := uint32_clock_monotonic_t;\n"
4103 "typealias integer {\n"
4104 " size = 64; align = %u; signed = false;\n"
4105 " map = clock.%s.value;\n"
4106 "} := uint64_clock_monotonic_t;\n\n",
4108 lttng_alignof(uint32_t) * CHAR_BIT
,
4110 lttng_alignof(uint64_t) * CHAR_BIT
,
4116 ret
= _lttng_stream_packet_context_declare(session
);
4120 ret
= _lttng_event_header_declare(session
);
4125 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4126 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4131 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4132 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
4136 session
->priv
->metadata_dumped
= 1;
4138 lttng_metadata_end(session
);
4143 * lttng_transport_register - LTT transport registration
4144 * @transport: transport structure
4146 * Registers a transport which can be used as output to extract the data out of
4147 * LTTng. The module calling this registration function must ensure that no
4148 * trap-inducing code will be executed by the transport functions. E.g.
4149 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4150 * is made visible to the transport function. This registration acts as a
4151 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4152 * after its registration must it synchronize the TLBs.
4154 void lttng_transport_register(struct lttng_transport
*transport
)
4157 * Make sure no page fault can be triggered by the module about to be
4158 * registered. We deal with this here so we don't have to call
4159 * vmalloc_sync_mappings() in each module's init.
4161 wrapper_vmalloc_sync_mappings();
4163 mutex_lock(&sessions_mutex
);
4164 list_add_tail(&transport
->node
, <tng_transport_list
);
4165 mutex_unlock(&sessions_mutex
);
4167 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4170 * lttng_transport_unregister - LTT transport unregistration
4171 * @transport: transport structure
4173 void lttng_transport_unregister(struct lttng_transport
*transport
)
4175 mutex_lock(&sessions_mutex
);
4176 list_del(&transport
->node
);
4177 mutex_unlock(&sessions_mutex
);
4179 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4181 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4184 * Make sure no page fault can be triggered by the module about to be
4185 * registered. We deal with this here so we don't have to call
4186 * vmalloc_sync_mappings() in each module's init.
4188 wrapper_vmalloc_sync_mappings();
4190 mutex_lock(&sessions_mutex
);
4191 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4192 mutex_unlock(&sessions_mutex
);
4194 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4196 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4198 mutex_lock(&sessions_mutex
);
4199 list_del(&transport
->node
);
4200 mutex_unlock(&sessions_mutex
);
4202 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4204 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4206 enum cpuhp_state lttng_hp_prepare
;
4207 enum cpuhp_state lttng_hp_online
;
4209 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4211 struct lttng_cpuhp_node
*lttng_node
;
4213 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4214 switch (lttng_node
->component
) {
4215 case LTTNG_RING_BUFFER_FRONTEND
:
4217 case LTTNG_RING_BUFFER_BACKEND
:
4218 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4219 case LTTNG_RING_BUFFER_ITER
:
4221 case LTTNG_CONTEXT_PERF_COUNTERS
:
4228 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4230 struct lttng_cpuhp_node
*lttng_node
;
4232 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4233 switch (lttng_node
->component
) {
4234 case LTTNG_RING_BUFFER_FRONTEND
:
4235 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4236 case LTTNG_RING_BUFFER_BACKEND
:
4238 case LTTNG_RING_BUFFER_ITER
:
4240 case LTTNG_CONTEXT_PERF_COUNTERS
:
4241 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4247 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4249 struct lttng_cpuhp_node
*lttng_node
;
4251 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4252 switch (lttng_node
->component
) {
4253 case LTTNG_RING_BUFFER_FRONTEND
:
4254 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4255 case LTTNG_RING_BUFFER_BACKEND
:
4257 case LTTNG_RING_BUFFER_ITER
:
4258 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4259 case LTTNG_CONTEXT_PERF_COUNTERS
:
4260 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4266 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4268 struct lttng_cpuhp_node
*lttng_node
;
4270 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4271 switch (lttng_node
->component
) {
4272 case LTTNG_RING_BUFFER_FRONTEND
:
4273 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4274 case LTTNG_RING_BUFFER_BACKEND
:
4276 case LTTNG_RING_BUFFER_ITER
:
4278 case LTTNG_CONTEXT_PERF_COUNTERS
:
4285 static int __init
lttng_init_cpu_hotplug(void)
4289 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4290 lttng_hotplug_prepare
,
4291 lttng_hotplug_dead
);
4295 lttng_hp_prepare
= ret
;
4296 lttng_rb_set_hp_prepare(ret
);
4298 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4299 lttng_hotplug_online
,
4300 lttng_hotplug_offline
);
4302 cpuhp_remove_multi_state(lttng_hp_prepare
);
4303 lttng_hp_prepare
= 0;
4306 lttng_hp_online
= ret
;
4307 lttng_rb_set_hp_online(ret
);
4312 static void __exit
lttng_exit_cpu_hotplug(void)
4314 lttng_rb_set_hp_online(0);
4315 cpuhp_remove_multi_state(lttng_hp_online
);
4316 lttng_rb_set_hp_prepare(0);
4317 cpuhp_remove_multi_state(lttng_hp_prepare
);
4320 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4321 static int lttng_init_cpu_hotplug(void)
4325 static void lttng_exit_cpu_hotplug(void)
4328 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4330 static int __init
lttng_events_init(void)
4334 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4337 ret
= wrapper_get_pfnblock_flags_mask_init();
4340 ret
= wrapper_get_pageblock_flags_mask_init();
4343 ret
= lttng_probes_init();
4346 ret
= lttng_context_init();
4349 ret
= lttng_tracepoint_init();
4352 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4353 if (!event_recorder_cache
) {
4355 goto error_kmem_event_recorder
;
4357 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4358 if (!event_recorder_private_cache
) {
4360 goto error_kmem_event_recorder_private
;
4362 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4363 if (!event_notifier_cache
) {
4365 goto error_kmem_event_notifier
;
4367 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4368 if (!event_notifier_private_cache
) {
4370 goto error_kmem_event_notifier_private
;
4372 ret
= lttng_abi_init();
4375 ret
= lttng_logger_init();
4378 ret
= lttng_init_cpu_hotplug();
4381 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4382 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4383 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4384 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4385 LTTNG_MODULES_EXTRAVERSION
,
4387 #ifdef LTTNG_EXTRA_VERSION_GIT
4388 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4392 #ifdef LTTNG_EXTRA_VERSION_NAME
4393 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4397 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4398 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4399 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4403 lttng_logger_exit();
4407 kmem_cache_destroy(event_notifier_private_cache
);
4408 error_kmem_event_notifier_private
:
4409 kmem_cache_destroy(event_notifier_cache
);
4410 error_kmem_event_notifier
:
4411 kmem_cache_destroy(event_recorder_private_cache
);
4412 error_kmem_event_recorder_private
:
4413 kmem_cache_destroy(event_recorder_cache
);
4414 error_kmem_event_recorder
:
4415 lttng_tracepoint_exit();
4417 lttng_context_exit();
4418 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4419 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4420 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4421 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4422 LTTNG_MODULES_EXTRAVERSION
,
4424 #ifdef LTTNG_EXTRA_VERSION_GIT
4425 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4429 #ifdef LTTNG_EXTRA_VERSION_NAME
4430 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4437 module_init(lttng_events_init
);
4439 static void __exit
lttng_events_exit(void)
4441 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4443 lttng_exit_cpu_hotplug();
4444 lttng_logger_exit();
4446 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4447 lttng_session_destroy(session_priv
->pub
);
4448 kmem_cache_destroy(event_recorder_cache
);
4449 kmem_cache_destroy(event_recorder_private_cache
);
4450 kmem_cache_destroy(event_notifier_cache
);
4451 kmem_cache_destroy(event_notifier_private_cache
);
4452 lttng_tracepoint_exit();
4453 lttng_context_exit();
4454 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4455 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4456 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4457 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4458 LTTNG_MODULES_EXTRAVERSION
,
4460 #ifdef LTTNG_EXTRA_VERSION_GIT
4461 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4465 #ifdef LTTNG_EXTRA_VERSION_NAME
4466 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4472 module_exit(lttng_events_exit
);
4474 #include <generated/patches.h>
4475 #ifdef LTTNG_EXTRA_VERSION_GIT
4476 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4478 #ifdef LTTNG_EXTRA_VERSION_NAME
4479 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4481 MODULE_LICENSE("GPL and additional rights");
4482 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4483 MODULE_DESCRIPTION("LTTng tracer");
4484 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4485 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4486 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4487 LTTNG_MODULES_EXTRAVERSION
);