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 bool lttng_kernel_event_id_available(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_channel_buffer
*chan
= event_recorder_enabler
->chan
;
881 case LTTNG_KERNEL_ABI_TRACEPOINT
:
883 case LTTNG_KERNEL_ABI_KPROBE
:
885 case LTTNG_KERNEL_ABI_SYSCALL
:
887 case LTTNG_KERNEL_ABI_UPROBE
:
888 if (chan
->priv
->free_event_id
== -1U)
891 case LTTNG_KERNEL_ABI_KRETPROBE
:
892 /* kretprobes require 2 event IDs. */
893 if (chan
->priv
->free_event_id
>= -2U)
901 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
910 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
912 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
913 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
915 switch (event_enabler
->enabler_type
) {
916 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
918 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
919 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
920 struct lttng_kernel_event_recorder
*event_recorder
;
921 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
922 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
924 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
927 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
928 if (!event_recorder_priv
) {
929 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
932 event_recorder_priv
->pub
= event_recorder
;
933 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
934 event_recorder
->priv
= event_recorder_priv
;
935 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
937 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
938 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
939 event_recorder
->priv
->parent
.instrumentation
= itype
;
940 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
941 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
943 event_recorder
->chan
= chan
;
944 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
945 return &event_recorder
->parent
;
947 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
949 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
950 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
951 struct lttng_kernel_event_notifier
*event_notifier
;
952 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
954 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
957 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
958 if (!event_notifier_priv
) {
959 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
962 event_notifier_priv
->pub
= event_notifier
;
963 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
964 event_notifier
->priv
= event_notifier_priv
;
965 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
967 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
968 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
969 event_notifier
->priv
->parent
.instrumentation
= itype
;
970 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
971 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
972 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
974 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
975 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
976 event_notifier
->priv
->num_captures
= 0;
977 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
978 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
979 return &event_notifier
->parent
;
987 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
989 switch (event
->type
) {
990 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
992 struct lttng_kernel_event_recorder
*event_recorder
=
993 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
995 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
996 kmem_cache_free(event_recorder_cache
, event_recorder
);
999 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1001 struct lttng_kernel_event_notifier
*event_notifier
=
1002 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1004 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1005 kmem_cache_free(event_notifier_cache
, event_notifier
);
1014 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
1016 switch (event
->type
) {
1017 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1019 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1021 struct lttng_kernel_event_notifier
*event_notifier
=
1022 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1023 struct lttng_counter
*error_counter
;
1024 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
1025 size_t dimension_index
[1];
1029 * Clear the error counter bucket. The sessiond keeps track of which
1030 * bucket is currently in use. We trust it. The session lock
1031 * synchronizes against concurrent creation of the error
1034 error_counter
= event_notifier_group
->error_counter
;
1038 * Check that the index is within the boundary of the counter.
1040 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1041 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1042 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1046 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1047 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1049 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1050 event_notifier
->priv
->error_counter_index
);
1061 * Supports event creation while tracing session is active.
1062 * Needs to be called with sessions mutex held.
1065 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
1066 const struct lttng_kernel_event_desc
*event_desc
)
1068 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1069 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1070 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1071 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1072 struct lttng_kernel_event_common_private
*event_priv
;
1073 struct lttng_kernel_event_common
*event
;
1074 struct lttng_kernel_event_recorder
*event_recorder
;
1075 const char *event_name
;
1076 struct hlist_head
*head
;
1079 if (!lttng_kernel_event_id_available(&event_enabler
->parent
)) {
1085 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1086 event_name
= event_desc
->event_name
;
1089 case LTTNG_KERNEL_ABI_KPROBE
:
1091 case LTTNG_KERNEL_ABI_UPROBE
:
1093 case LTTNG_KERNEL_ABI_KRETPROBE
:
1095 case LTTNG_KERNEL_ABI_SYSCALL
:
1096 event_name
= event_param
->name
;
1099 case LTTNG_KERNEL_ABI_FUNCTION
:
1101 case LTTNG_KERNEL_ABI_NOOP
:
1109 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1110 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1111 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1117 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1122 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1125 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1126 /* Event will be enabled by enabler sync. */
1128 event
->priv
->registered
= 0;
1129 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1130 if (!event
->priv
->desc
) {
1132 goto register_error
;
1134 /* Populate lttng_event structure before event registration. */
1138 case LTTNG_KERNEL_ABI_KPROBE
:
1140 * Needs to be explicitly enabled after creation, since
1141 * we may want to apply filters.
1144 event
->priv
->registered
= 1;
1146 * Populate lttng_event structure before event
1150 ret
= lttng_kprobes_register_event(event_name
,
1151 event_param
->u
.kprobe
.symbol_name
,
1152 event_param
->u
.kprobe
.offset
,
1153 event_param
->u
.kprobe
.addr
,
1157 goto register_error
;
1159 ret
= try_module_get(event
->priv
->desc
->owner
);
1163 case LTTNG_KERNEL_ABI_KRETPROBE
:
1165 struct lttng_kernel_event_common
*event_return
;
1167 /* kretprobe defines 2 events */
1169 * Needs to be explicitly enabled after creation, since
1170 * we may want to apply filters.
1173 event
->priv
->registered
= 1;
1175 event_return
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1181 event_return
->enabled
= 0;
1182 event_return
->priv
->registered
= 1;
1185 * Populate lttng_event structure before kretprobe registration.
1188 ret
= lttng_kretprobes_register(event_name
,
1189 event_param
->u
.kretprobe
.symbol_name
,
1190 event_param
->u
.kretprobe
.offset
,
1191 event_param
->u
.kretprobe
.addr
,
1192 event
, event_return
);
1194 lttng_kernel_event_free(event_return
);
1196 goto register_error
;
1198 /* Take 2 refs on the module: one per event. */
1199 ret
= try_module_get(event
->priv
->desc
->owner
);
1201 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1203 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1204 WARN_ON_ONCE(ret
> 0);
1206 lttng_kernel_event_free(event_return
);
1207 module_put(event_return
->priv
->desc
->owner
);
1208 module_put(event
->priv
->desc
->owner
);
1209 goto statedump_error
;
1211 list_add(&event_return
->priv
->node
, event_list_head
);
1215 case LTTNG_KERNEL_ABI_SYSCALL
:
1217 * Needs to be explicitly enabled after creation, since
1218 * we may want to apply filters.
1221 event
->priv
->registered
= 0;
1222 event
->priv
->desc
= event_desc
;
1223 switch (event_param
->u
.syscall
.entryexit
) {
1224 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1226 goto register_error
;
1227 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1228 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1230 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1231 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1234 switch (event_param
->u
.syscall
.abi
) {
1235 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1237 goto register_error
;
1238 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1239 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1241 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1242 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1245 if (!event
->priv
->desc
) {
1247 goto register_error
;
1251 case LTTNG_KERNEL_ABI_UPROBE
:
1253 * Needs to be explicitly enabled after creation, since
1254 * we may want to apply filters.
1257 event
->priv
->registered
= 1;
1260 * Populate lttng_event structure before event
1265 ret
= lttng_uprobes_register_event(event_param
->name
,
1266 event_param
->u
.uprobe
.fd
,
1269 goto register_error
;
1270 ret
= try_module_get(event
->priv
->desc
->owner
);
1274 case LTTNG_KERNEL_ABI_FUNCTION
:
1276 case LTTNG_KERNEL_ABI_NOOP
:
1281 goto register_error
;
1283 ret
= _lttng_event_recorder_metadata_statedump(event
);
1284 WARN_ON_ONCE(ret
> 0);
1286 goto statedump_error
;
1288 hlist_add_head(&event
->priv
->hlist_node
, head
);
1289 list_add(&event
->priv
->node
, event_list_head
);
1290 return event_recorder
;
1293 /* If a statedump error occurs, events will not be readable. */
1295 lttng_kernel_event_free(event
);
1300 return ERR_PTR(ret
);
1304 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1305 const struct lttng_kernel_event_desc
*event_desc
)
1307 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1308 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1309 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1310 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1311 struct lttng_kernel_event_common_private
*event_priv
;
1312 struct lttng_kernel_event_common
*event
;
1313 struct lttng_kernel_event_notifier
*event_notifier
;
1314 const char *event_name
;
1315 struct hlist_head
*head
;
1319 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1320 event_name
= event_desc
->event_name
;
1323 case LTTNG_KERNEL_ABI_KPROBE
:
1325 case LTTNG_KERNEL_ABI_UPROBE
:
1327 case LTTNG_KERNEL_ABI_SYSCALL
:
1328 event_name
= event_param
->name
;
1331 case LTTNG_KERNEL_ABI_KRETPROBE
:
1333 case LTTNG_KERNEL_ABI_FUNCTION
:
1335 case LTTNG_KERNEL_ABI_NOOP
:
1343 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1344 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1345 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1351 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1356 event_notifier
= container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1359 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1360 /* Event will be enabled by enabler sync. */
1362 event
->priv
->registered
= 0;
1363 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1364 if (!event
->priv
->desc
) {
1366 goto register_error
;
1368 /* Populate lttng_event_notifier structure before event registration. */
1372 case LTTNG_KERNEL_ABI_KPROBE
:
1374 * Needs to be explicitly enabled after creation, since
1375 * we may want to apply filters.
1378 event
->priv
->registered
= 1;
1380 * Populate lttng_event_notifier structure before event
1384 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1385 event_param
->u
.kprobe
.symbol_name
,
1386 event_param
->u
.kprobe
.offset
,
1387 event_param
->u
.kprobe
.addr
,
1391 goto register_error
;
1393 ret
= try_module_get(event
->priv
->desc
->owner
);
1397 case LTTNG_KERNEL_ABI_SYSCALL
:
1399 * Needs to be explicitly enabled after creation, since
1400 * we may want to apply filters.
1403 event
->priv
->registered
= 0;
1404 event
->priv
->desc
= event_desc
;
1405 switch (event_param
->u
.syscall
.entryexit
) {
1406 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1408 goto register_error
;
1409 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1410 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1412 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1413 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1416 switch (event_param
->u
.syscall
.abi
) {
1417 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1419 goto register_error
;
1420 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1421 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1423 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1424 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1428 if (!event
->priv
->desc
) {
1430 goto register_error
;
1434 case LTTNG_KERNEL_ABI_UPROBE
:
1436 * Needs to be explicitly enabled after creation, since
1437 * we may want to apply filters.
1440 event
->priv
->registered
= 1;
1443 * Populate lttng_event_notifier structure before
1444 * event_notifier registration.
1448 ret
= lttng_uprobes_register_event(event_param
->name
,
1449 event_param
->u
.uprobe
.fd
,
1452 goto register_error
;
1453 ret
= try_module_get(event
->priv
->desc
->owner
);
1457 case LTTNG_KERNEL_ABI_KRETPROBE
:
1459 case LTTNG_KERNEL_ABI_FUNCTION
:
1461 case LTTNG_KERNEL_ABI_NOOP
:
1466 goto register_error
;
1469 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1471 goto register_error
;
1473 list_add(&event
->priv
->node
, event_list_head
);
1474 hlist_add_head(&event
->priv
->hlist_node
, head
);
1476 return event_notifier
;
1479 lttng_kernel_event_free(event
);
1483 return ERR_PTR(ret
);
1486 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1487 const struct lttng_kernel_event_desc
*event_desc
)
1489 switch (event_enabler
->enabler_type
) {
1490 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1492 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1493 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1494 struct lttng_kernel_event_recorder
*event_recorder
;
1496 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1497 if (!event_recorder
)
1499 return &event_recorder
->parent
;
1501 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1503 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1504 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1505 struct lttng_kernel_event_notifier
*event_notifier
;
1507 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1508 if (!event_notifier
)
1510 return &event_notifier
->parent
;
1517 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1518 const struct lttng_kernel_event_desc
*event_desc
)
1520 struct lttng_kernel_event_common
*event
;
1522 mutex_lock(&sessions_mutex
);
1523 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1524 mutex_unlock(&sessions_mutex
);
1530 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1531 const size_t *dim_indexes
, int32_t cpu
,
1532 int64_t *val
, bool *overflow
, bool *underflow
)
1534 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1535 cpu
, val
, overflow
, underflow
);
1538 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1539 const size_t *dim_indexes
, int64_t *val
,
1540 bool *overflow
, bool *underflow
)
1542 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1543 val
, overflow
, underflow
);
1546 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1547 const size_t *dim_indexes
)
1549 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1552 /* Only used for tracepoints for now. */
1554 void register_event(struct lttng_kernel_event_common
*event
)
1556 const struct lttng_kernel_event_desc
*desc
;
1559 if (event
->priv
->registered
)
1562 desc
= event
->priv
->desc
;
1563 switch (event
->priv
->instrumentation
) {
1564 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1565 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1566 desc
->tp_class
->probe_callback
,
1570 case LTTNG_KERNEL_ABI_SYSCALL
:
1571 ret
= lttng_syscall_filter_enable_event(event
);
1574 case LTTNG_KERNEL_ABI_KPROBE
:
1576 case LTTNG_KERNEL_ABI_UPROBE
:
1580 case LTTNG_KERNEL_ABI_KRETPROBE
:
1581 switch (event
->type
) {
1582 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1585 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1591 case LTTNG_KERNEL_ABI_FUNCTION
:
1593 case LTTNG_KERNEL_ABI_NOOP
:
1599 event
->priv
->registered
= 1;
1602 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1604 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1605 const struct lttng_kernel_event_desc
*desc
;
1608 if (!event_priv
->registered
)
1611 desc
= event_priv
->desc
;
1612 switch (event_priv
->instrumentation
) {
1613 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1614 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1615 event_priv
->desc
->tp_class
->probe_callback
,
1619 case LTTNG_KERNEL_ABI_KPROBE
:
1620 lttng_kprobes_unregister_event(event
);
1624 case LTTNG_KERNEL_ABI_KRETPROBE
:
1625 switch (event
->type
) {
1626 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1627 lttng_kretprobes_unregister(event
);
1630 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1636 case LTTNG_KERNEL_ABI_SYSCALL
:
1637 ret
= lttng_syscall_filter_disable_event(event
);
1640 case LTTNG_KERNEL_ABI_NOOP
:
1641 switch (event
->type
) {
1642 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1645 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1651 case LTTNG_KERNEL_ABI_UPROBE
:
1652 lttng_uprobes_unregister_event(event
);
1656 case LTTNG_KERNEL_ABI_FUNCTION
:
1662 event_priv
->registered
= 0;
1667 * Only used internally at session destruction.
1670 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1672 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1673 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1675 lttng_free_event_filter_runtime(event
);
1676 /* Free event enabler refs */
1677 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1678 &event_priv
->enablers_ref_head
, node
)
1681 switch (event
->type
) {
1682 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1684 struct lttng_kernel_event_recorder
*event_recorder
=
1685 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1687 switch (event_priv
->instrumentation
) {
1688 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1689 lttng_event_desc_put(event_priv
->desc
);
1692 case LTTNG_KERNEL_ABI_KPROBE
:
1693 module_put(event_priv
->desc
->owner
);
1694 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1697 case LTTNG_KERNEL_ABI_KRETPROBE
:
1698 module_put(event_priv
->desc
->owner
);
1699 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1702 case LTTNG_KERNEL_ABI_SYSCALL
:
1705 case LTTNG_KERNEL_ABI_UPROBE
:
1706 module_put(event_priv
->desc
->owner
);
1707 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1710 case LTTNG_KERNEL_ABI_FUNCTION
:
1712 case LTTNG_KERNEL_ABI_NOOP
:
1717 list_del(&event_recorder
->priv
->parent
.node
);
1718 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1719 kmem_cache_free(event_recorder_cache
, event_recorder
);
1722 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1724 struct lttng_kernel_event_notifier
*event_notifier
=
1725 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1727 switch (event_notifier
->priv
->parent
.instrumentation
) {
1728 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1729 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1732 case LTTNG_KERNEL_ABI_KPROBE
:
1733 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1734 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1737 case LTTNG_KERNEL_ABI_SYSCALL
:
1740 case LTTNG_KERNEL_ABI_UPROBE
:
1741 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1742 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1745 case LTTNG_KERNEL_ABI_KRETPROBE
:
1747 case LTTNG_KERNEL_ABI_FUNCTION
:
1749 case LTTNG_KERNEL_ABI_NOOP
:
1754 list_del(&event_notifier
->priv
->parent
.node
);
1755 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1756 kmem_cache_free(event_notifier_cache
, event_notifier
);
1764 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1765 enum tracker_type tracker_type
)
1767 switch (tracker_type
) {
1769 return &session
->pid_tracker
;
1771 return &session
->vpid_tracker
;
1773 return &session
->uid_tracker
;
1775 return &session
->vuid_tracker
;
1777 return &session
->gid_tracker
;
1779 return &session
->vgid_tracker
;
1786 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1787 enum tracker_type tracker_type
, int id
)
1789 struct lttng_kernel_id_tracker
*tracker
;
1792 tracker
= get_tracker(session
, tracker_type
);
1797 mutex_lock(&sessions_mutex
);
1799 /* track all ids: destroy tracker. */
1800 lttng_id_tracker_destroy(tracker
, true);
1803 ret
= lttng_id_tracker_add(tracker
, id
);
1805 mutex_unlock(&sessions_mutex
);
1809 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1810 enum tracker_type tracker_type
, int id
)
1812 struct lttng_kernel_id_tracker
*tracker
;
1815 tracker
= get_tracker(session
, tracker_type
);
1820 mutex_lock(&sessions_mutex
);
1822 /* untrack all ids: replace by empty tracker. */
1823 ret
= lttng_id_tracker_empty_set(tracker
);
1825 ret
= lttng_id_tracker_del(tracker
, id
);
1827 mutex_unlock(&sessions_mutex
);
1832 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1834 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1835 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1836 struct lttng_id_hash_node
*e
;
1839 mutex_lock(&sessions_mutex
);
1841 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1842 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1844 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1850 /* ID tracker disabled. */
1851 if (iter
>= *pos
&& iter
== 0) {
1852 return id_tracker_p
; /* empty tracker */
1860 /* Called with sessions_mutex held. */
1862 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1864 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1865 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1866 struct lttng_id_hash_node
*e
;
1871 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1872 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1874 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1875 if (iter
++ >= *ppos
)
1880 /* ID tracker disabled. */
1881 if (iter
>= *ppos
&& iter
== 0)
1882 return p
; /* empty tracker */
1891 void id_list_stop(struct seq_file
*m
, void *p
)
1893 mutex_unlock(&sessions_mutex
);
1897 int id_list_show(struct seq_file
*m
, void *p
)
1899 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1900 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1903 if (p
== id_tracker_p
) {
1904 /* Tracker disabled. */
1907 const struct lttng_id_hash_node
*e
= p
;
1909 id
= lttng_id_tracker_get_node_id(e
);
1911 switch (id_tracker
->priv
->tracker_type
) {
1913 seq_printf(m
, "process { pid = %d; };\n", id
);
1916 seq_printf(m
, "process { vpid = %d; };\n", id
);
1919 seq_printf(m
, "user { uid = %d; };\n", id
);
1922 seq_printf(m
, "user { vuid = %d; };\n", id
);
1925 seq_printf(m
, "group { gid = %d; };\n", id
);
1928 seq_printf(m
, "group { vgid = %d; };\n", id
);
1931 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1937 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1938 .start
= id_list_start
,
1939 .next
= id_list_next
,
1940 .stop
= id_list_stop
,
1941 .show
= id_list_show
,
1945 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1947 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1951 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1953 struct seq_file
*m
= file
->private_data
;
1954 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1957 WARN_ON_ONCE(!id_tracker
);
1958 ret
= seq_release(inode
, file
);
1960 fput(id_tracker
->priv
->session
->priv
->file
);
1964 const struct file_operations lttng_tracker_ids_list_fops
= {
1965 .owner
= THIS_MODULE
,
1966 .open
= lttng_tracker_ids_list_open
,
1968 .llseek
= seq_lseek
,
1969 .release
= lttng_tracker_ids_list_release
,
1972 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1973 enum tracker_type tracker_type
)
1975 struct file
*tracker_ids_list_file
;
1979 file_fd
= lttng_get_unused_fd();
1985 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1986 <tng_tracker_ids_list_fops
,
1988 if (IS_ERR(tracker_ids_list_file
)) {
1989 ret
= PTR_ERR(tracker_ids_list_file
);
1992 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1994 goto refcount_error
;
1996 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1999 m
= tracker_ids_list_file
->private_data
;
2001 m
->private = get_tracker(session
, tracker_type
);
2002 BUG_ON(!m
->private);
2003 fd_install(file_fd
, tracker_ids_list_file
);
2008 atomic_long_dec(&session
->priv
->file
->f_count
);
2010 fput(tracker_ids_list_file
);
2012 put_unused_fd(file_fd
);
2018 * Enabler management.
2021 int lttng_match_enabler_star_glob(const char *desc_name
,
2022 const char *pattern
)
2024 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
2025 desc_name
, LTTNG_SIZE_MAX
))
2031 int lttng_match_enabler_name(const char *desc_name
,
2034 if (strcmp(desc_name
, name
))
2040 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
2041 struct lttng_event_enabler_common
*enabler
)
2043 const char *desc_name
, *enabler_name
;
2044 bool compat
= false, entry
= false;
2046 enabler_name
= enabler
->event_param
.name
;
2047 switch (enabler
->event_param
.instrumentation
) {
2048 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2049 desc_name
= desc
->event_name
;
2050 switch (enabler
->format_type
) {
2051 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2052 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2053 case LTTNG_ENABLER_FORMAT_NAME
:
2054 return lttng_match_enabler_name(desc_name
, enabler_name
);
2060 case LTTNG_KERNEL_ABI_SYSCALL
:
2061 desc_name
= desc
->event_name
;
2062 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2063 desc_name
+= strlen("compat_");
2066 if (!strncmp(desc_name
, "syscall_exit_",
2067 strlen("syscall_exit_"))) {
2068 desc_name
+= strlen("syscall_exit_");
2069 } else if (!strncmp(desc_name
, "syscall_entry_",
2070 strlen("syscall_entry_"))) {
2071 desc_name
+= strlen("syscall_entry_");
2077 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2078 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2080 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2084 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2091 switch (enabler
->event_param
.u
.syscall
.abi
) {
2092 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2094 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2098 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2105 switch (enabler
->event_param
.u
.syscall
.match
) {
2106 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2107 switch (enabler
->format_type
) {
2108 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2109 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2110 case LTTNG_ENABLER_FORMAT_NAME
:
2111 return lttng_match_enabler_name(desc_name
, enabler_name
);
2116 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2117 return -EINVAL
; /* Not implemented. */
2129 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2130 struct lttng_event_enabler_common
*enabler
)
2134 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2142 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2143 struct lttng_kernel_event_common
*event
)
2145 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2148 switch (event_enabler
->enabler_type
) {
2149 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2151 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2152 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2153 struct lttng_kernel_event_recorder
*event_recorder
=
2154 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2156 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2157 && 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 (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2170 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2171 && event
->priv
->user_token
== event_enabler
->user_token
)
2182 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2183 const struct lttng_kernel_event_desc
*desc
,
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 (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2202 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2204 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2205 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2206 struct lttng_kernel_event_notifier
*event_notifier
=
2207 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2209 if (event
->priv
->desc
== desc
2210 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2211 && event
->priv
->user_token
== event_enabler
->user_token
)
2222 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2223 const char *event_name
,
2224 struct lttng_kernel_event_common
*event
)
2226 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2229 switch (event_enabler
->enabler_type
) {
2230 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2232 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2233 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2234 struct lttng_kernel_event_recorder
*event_recorder
=
2235 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2237 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2238 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2243 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2245 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2246 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2247 struct lttng_kernel_event_notifier
*event_notifier
=
2248 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2250 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2251 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2252 && event
->priv
->user_token
== event_enabler
->user_token
)
2264 struct lttng_enabler_ref
*lttng_enabler_ref(
2265 struct list_head
*enablers_ref_list
,
2266 struct lttng_event_enabler_common
*enabler
)
2268 struct lttng_enabler_ref
*enabler_ref
;
2270 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2271 if (enabler_ref
->ref
== enabler
)
2278 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2280 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2281 struct lttng_kernel_probe_desc
*probe_desc
;
2282 const struct lttng_kernel_event_desc
*desc
;
2283 struct list_head
*probe_list
;
2286 probe_list
= lttng_get_probe_list_head();
2288 * For each probe event, if we find that a probe event matches
2289 * our enabler, create an associated lttng_event if not
2292 list_for_each_entry(probe_desc
, probe_list
, head
) {
2293 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2295 struct hlist_head
*head
;
2296 struct lttng_kernel_event_common
*event
;
2297 struct lttng_kernel_event_common_private
*event_priv
;
2299 desc
= probe_desc
->event_desc
[i
];
2300 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2304 * Check if already created.
2306 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2307 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2308 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2315 * We need to create an event for this event probe.
2317 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2319 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2320 probe_desc
->event_desc
[i
]->event_name
);
2327 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2331 ret
= lttng_syscalls_register_event(event_enabler
);
2336 * Create event if it is missing and present in the list of tracepoint probes.
2337 * Should be called with sessions mutex held.
2340 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2342 switch (event_enabler
->event_param
.instrumentation
) {
2343 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2344 lttng_create_tracepoint_event_if_missing(event_enabler
);
2347 case LTTNG_KERNEL_ABI_SYSCALL
:
2348 lttng_create_syscall_event_if_missing(event_enabler
);
2358 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2359 struct lttng_kernel_event_common
*event
)
2361 /* Link filter bytecodes if not linked yet. */
2362 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2363 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2367 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2368 struct lttng_kernel_event_common
*event
)
2370 switch (event_enabler
->enabler_type
) {
2371 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2373 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2375 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2376 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2377 struct lttng_kernel_event_notifier
*event_notifier
=
2378 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2380 /* Link capture bytecodes if not linked yet. */
2381 lttng_enabler_link_bytecode(event
->priv
->desc
,
2382 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2383 &event_notifier_enabler
->capture_bytecode_head
);
2384 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2393 * Create events associated with an event_enabler (if not already present),
2394 * and add backward reference from the event to the enabler.
2395 * Should be called with sessions mutex held.
2398 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2400 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2401 struct lttng_kernel_event_common_private
*event_priv
;
2403 lttng_syscall_table_set_wildcard_all(event_enabler
);
2405 /* First ensure that probe events are created for this enabler. */
2406 lttng_create_event_if_missing(event_enabler
);
2408 /* Link the created event with its associated enabler. */
2409 list_for_each_entry(event_priv
, event_list_head
, node
) {
2410 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2411 struct lttng_enabler_ref
*enabler_ref
;
2413 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2416 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2419 * If no backward ref, create it.
2420 * Add backward ref from event_notifier to enabler.
2422 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2426 enabler_ref
->ref
= event_enabler
;
2427 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2430 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2431 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2437 * Called at module load: connect the probe on all enablers matching
2439 * Called with sessions lock held.
2441 int lttng_fix_pending_events(void)
2443 struct lttng_kernel_session_private
*session_priv
;
2445 list_for_each_entry(session_priv
, &sessions
, list
)
2446 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2450 static bool lttng_event_notifier_group_has_active_event_notifiers(
2451 struct lttng_event_notifier_group
*event_notifier_group
)
2453 struct lttng_event_enabler_common
*event_enabler
;
2455 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2456 if (event_enabler
->enabled
)
2462 bool lttng_event_notifier_active(void)
2464 struct lttng_event_notifier_group
*event_notifier_group
;
2466 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2467 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2473 int lttng_fix_pending_event_notifiers(void)
2475 struct lttng_event_notifier_group
*event_notifier_group
;
2477 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2478 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2482 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2483 enum lttng_enabler_format_type format_type
,
2484 struct lttng_kernel_abi_event
*event_param
,
2485 struct lttng_kernel_channel_buffer
*chan
)
2487 struct lttng_event_recorder_enabler
*event_enabler
;
2489 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2492 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2493 event_enabler
->parent
.format_type
= format_type
;
2494 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2495 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2496 sizeof(event_enabler
->parent
.event_param
));
2497 event_enabler
->chan
= chan
;
2499 event_enabler
->parent
.enabled
= 0;
2500 return event_enabler
;
2503 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2504 struct lttng_event_recorder_enabler
*event_enabler
)
2506 mutex_lock(&sessions_mutex
);
2507 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2508 event_enabler
->parent
.published
= true;
2509 lttng_session_lazy_sync_event_enablers(session
);
2510 mutex_unlock(&sessions_mutex
);
2513 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2515 mutex_lock(&sessions_mutex
);
2516 event_enabler
->enabled
= 1;
2517 lttng_event_enabler_sync(event_enabler
);
2518 mutex_unlock(&sessions_mutex
);
2522 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2524 mutex_lock(&sessions_mutex
);
2525 event_enabler
->enabled
= 0;
2526 lttng_event_enabler_sync(event_enabler
);
2527 mutex_unlock(&sessions_mutex
);
2532 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2533 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2535 struct lttng_kernel_bytecode_node
*bytecode_node
;
2536 uint32_t bytecode_len
;
2539 ret
= get_user(bytecode_len
, &bytecode
->len
);
2542 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2546 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2547 sizeof(*bytecode
) + bytecode_len
);
2551 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2552 bytecode_node
->enabler
= enabler
;
2553 /* Enforce length based on allocated size */
2554 bytecode_node
->bc
.len
= bytecode_len
;
2555 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2560 lttng_kvfree(bytecode_node
);
2564 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2565 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2568 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2571 lttng_event_enabler_sync(event_enabler
);
2578 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2579 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2582 switch (event
->priv
->instrumentation
) {
2583 case LTTNG_KERNEL_ABI_UPROBE
:
2584 return lttng_uprobes_event_add_callsite(event
, callsite
);
2591 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2593 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2595 /* Destroy filter bytecode */
2596 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2597 &enabler
->filter_bytecode_head
, node
) {
2598 lttng_kvfree(filter_node
);
2602 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2604 lttng_enabler_destroy(event_enabler
);
2605 if (event_enabler
->published
)
2606 list_del(&event_enabler
->node
);
2608 switch (event_enabler
->enabler_type
) {
2609 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2611 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2612 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2614 kfree(event_recorder_enabler
);
2617 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2619 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2620 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2622 kfree(event_notifier_enabler
);
2630 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2631 enum lttng_enabler_format_type format_type
,
2632 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2633 struct lttng_event_notifier_group
*event_notifier_group
)
2635 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2637 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2638 if (!event_notifier_enabler
)
2641 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2642 event_notifier_enabler
->parent
.format_type
= format_type
;
2643 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2644 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2646 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2647 event_notifier_enabler
->num_captures
= 0;
2649 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2650 sizeof(event_notifier_enabler
->parent
.event_param
));
2652 event_notifier_enabler
->parent
.enabled
= 0;
2653 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2654 event_notifier_enabler
->group
= event_notifier_group
;
2655 return event_notifier_enabler
;
2658 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2659 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2661 mutex_lock(&sessions_mutex
);
2662 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2663 event_notifier_enabler
->parent
.published
= true;
2664 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2665 mutex_unlock(&sessions_mutex
);
2668 int lttng_event_notifier_enabler_enable(
2669 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2671 mutex_lock(&sessions_mutex
);
2672 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2673 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2674 mutex_unlock(&sessions_mutex
);
2678 int lttng_event_notifier_enabler_disable(
2679 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2681 mutex_lock(&sessions_mutex
);
2682 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2683 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2684 mutex_unlock(&sessions_mutex
);
2688 int lttng_event_notifier_enabler_attach_capture_bytecode(
2689 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2690 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2692 struct lttng_kernel_bytecode_node
*bytecode_node
;
2693 struct lttng_event_enabler_common
*enabler
=
2694 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2695 uint32_t bytecode_len
;
2698 ret
= get_user(bytecode_len
, &bytecode
->len
);
2702 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2707 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2708 sizeof(*bytecode
) + bytecode_len
);
2712 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2713 bytecode_node
->enabler
= enabler
;
2715 /* Enforce length based on allocated size */
2716 bytecode_node
->bc
.len
= bytecode_len
;
2717 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2719 event_notifier_enabler
->num_captures
++;
2721 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2725 lttng_kvfree(bytecode_node
);
2731 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2733 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2734 struct lttng_kernel_bytecode_runtime
*runtime
;
2735 struct lttng_enabler_ref
*enabler_ref
;
2737 /* Check if has enablers without bytecode enabled */
2738 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2739 if (enabler_ref
->ref
->enabled
2740 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2741 has_enablers_without_filter_bytecode
= 1;
2745 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2747 /* Enable filters */
2748 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2749 lttng_bytecode_sync_state(runtime
);
2752 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2756 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2758 switch (event
->type
) {
2759 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2761 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2763 struct lttng_kernel_event_notifier
*event_notifier
=
2764 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2765 struct lttng_kernel_bytecode_runtime
*runtime
;
2766 int nr_captures
= 0;
2768 /* Enable captures */
2769 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2770 lttng_bytecode_sync_state(runtime
);
2773 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2782 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2784 struct lttng_enabler_ref
*enabler_ref
;
2785 bool enabled
= false;
2787 switch (event
->priv
->instrumentation
) {
2788 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2790 case LTTNG_KERNEL_ABI_SYSCALL
:
2792 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2793 if (enabler_ref
->ref
->enabled
) {
2804 switch (event
->type
) {
2805 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2807 struct lttng_kernel_event_recorder
*event_recorder
=
2808 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2811 * Enabled state is based on union of enablers, with
2812 * intersection of session and channel transient enable
2815 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2817 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2826 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2828 switch (event
->priv
->instrumentation
) {
2829 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2831 case LTTNG_KERNEL_ABI_SYSCALL
:
2835 /* Not handled with lazy sync. */
2841 * Should be called with sessions mutex held.
2844 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2845 struct list_head
*event_list
)
2847 struct lttng_kernel_event_common_private
*event_priv
;
2848 struct lttng_event_enabler_common
*event_enabler
;
2850 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2851 lttng_event_enabler_ref_events(event_enabler
);
2854 * For each event, if at least one of its enablers is enabled,
2855 * and its channel and session transient states are enabled, we
2856 * enable the event, else we disable it.
2858 list_for_each_entry(event_priv
, event_list
, node
) {
2859 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2862 if (!lttng_event_is_lazy_sync(event
))
2865 enabled
= lttng_get_event_enabled_state(event
);
2866 WRITE_ONCE(event
->enabled
, enabled
);
2868 * Sync tracepoint registration with event enabled state.
2871 register_event(event
);
2873 _lttng_event_unregister(event
);
2876 lttng_event_sync_filter_state(event
);
2877 lttng_event_sync_capture_state(event
);
2882 * lttng_session_sync_event_enablers should be called just before starting a
2886 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2888 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2892 * Apply enablers to session events, adding events to session if need
2893 * be. It is required after each modification applied to an active
2894 * session, and right before session "start".
2895 * "lazy" sync means we only sync if required.
2896 * Should be called with sessions mutex held.
2899 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2901 /* We can skip if session is not active */
2902 if (!session
->active
)
2904 lttng_session_sync_event_enablers(session
);
2908 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2910 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2914 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2916 switch (event_enabler
->enabler_type
) {
2917 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2919 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2920 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2921 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2924 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2926 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2927 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2928 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2937 * Serialize at most one packet worth of metadata into a metadata
2939 * We grab the metadata cache mutex to get exclusive access to our metadata
2940 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2941 * allows us to do racy operations such as looking for remaining space left in
2942 * packet and write, since mutual exclusion protects us from concurrent writes.
2943 * Mutual exclusion on the metadata cache allow us to read the cache content
2944 * without racing against reallocation of the cache by updates.
2945 * Returns the number of bytes written in the channel, 0 if no data
2946 * was written and a negative value on error.
2948 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2949 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2951 struct lttng_kernel_ring_buffer_ctx ctx
;
2953 size_t len
, reserve_len
;
2956 * Ensure we support mutiple get_next / put sequences followed by
2957 * put_next. The metadata cache lock protects reading the metadata
2958 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2959 * "flush" operations on the buffer invoked by different processes.
2960 * Moreover, since the metadata cache memory can be reallocated, we
2961 * need to have exclusive access against updates even though we only
2964 mutex_lock(&stream
->metadata_cache
->lock
);
2965 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2966 if (stream
->metadata_in
!= stream
->metadata_out
)
2969 /* Metadata regenerated, change the version. */
2970 if (stream
->metadata_cache
->version
!= stream
->version
)
2971 stream
->version
= stream
->metadata_cache
->version
;
2973 len
= stream
->metadata_cache
->metadata_written
-
2974 stream
->metadata_in
;
2977 reserve_len
= min_t(size_t,
2978 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2980 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2981 sizeof(char), NULL
);
2983 * If reservation failed, return an error to the caller.
2985 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2987 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2988 stream
->coherent
= false;
2991 stream
->transport
->ops
.event_write(&ctx
,
2992 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2994 stream
->transport
->ops
.event_commit(&ctx
);
2995 stream
->metadata_in
+= reserve_len
;
2996 if (reserve_len
< len
)
2997 stream
->coherent
= false;
2999 stream
->coherent
= true;
3004 *coherent
= stream
->coherent
;
3005 mutex_unlock(&stream
->metadata_cache
->lock
);
3010 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
3012 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
3013 mutex_lock(&session
->priv
->metadata_cache
->lock
);
3017 void lttng_metadata_end(struct lttng_kernel_session
*session
)
3019 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3020 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
3021 struct lttng_metadata_stream
*stream
;
3023 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
3024 wake_up_interruptible(&stream
->read_wait
);
3025 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
3030 * Write the metadata to the metadata cache.
3031 * Must be called with sessions_mutex held.
3032 * The metadata cache lock protects us from concurrent read access from
3033 * thread outputting metadata content to ring buffer.
3034 * The content of the printf is printed as a single atomic metadata
3037 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3038 const char *fmt
, ...)
3044 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3047 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3053 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3054 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3055 session
->priv
->metadata_cache
->cache_alloc
) {
3056 char *tmp_cache_realloc
;
3057 unsigned int tmp_cache_alloc_size
;
3059 tmp_cache_alloc_size
= max_t(unsigned int,
3060 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3061 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3062 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3063 if (!tmp_cache_realloc
)
3065 if (session
->priv
->metadata_cache
->data
) {
3066 memcpy(tmp_cache_realloc
,
3067 session
->priv
->metadata_cache
->data
,
3068 session
->priv
->metadata_cache
->cache_alloc
);
3069 vfree(session
->priv
->metadata_cache
->data
);
3072 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3073 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3075 memcpy(session
->priv
->metadata_cache
->data
+
3076 session
->priv
->metadata_cache
->metadata_written
,
3078 session
->priv
->metadata_cache
->metadata_written
+= len
;
3089 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3093 for (i
= 0; i
< nesting
; i
++) {
3096 ret
= lttng_metadata_printf(session
, " ");
3105 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3106 const struct lttng_kernel_event_field
*field
,
3109 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3113 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3114 const struct lttng_kernel_type_integer
*type
,
3115 enum lttng_kernel_string_encoding parent_encoding
,
3120 ret
= print_tabs(session
, nesting
);
3123 ret
= lttng_metadata_printf(session
,
3124 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3128 (parent_encoding
== lttng_kernel_string_encoding_none
)
3130 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3134 #if __BYTE_ORDER == __BIG_ENDIAN
3135 type
->reverse_byte_order
? " byte_order = le;" : ""
3137 type
->reverse_byte_order
? " byte_order = be;" : ""
3144 * Must be called with sessions_mutex held.
3147 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3148 const struct lttng_kernel_type_struct
*type
,
3151 const char *prev_field_name
= NULL
;
3153 uint32_t i
, nr_fields
;
3154 unsigned int alignment
;
3156 ret
= print_tabs(session
, nesting
);
3159 ret
= lttng_metadata_printf(session
,
3163 nr_fields
= type
->nr_fields
;
3164 for (i
= 0; i
< nr_fields
; i
++) {
3165 const struct lttng_kernel_event_field
*iter_field
;
3167 iter_field
= type
->fields
[i
];
3168 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3172 ret
= print_tabs(session
, nesting
);
3175 alignment
= type
->alignment
;
3177 ret
= lttng_metadata_printf(session
,
3181 ret
= lttng_metadata_printf(session
,
3188 * Must be called with sessions_mutex held.
3191 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3192 const struct lttng_kernel_event_field
*field
,
3197 ret
= _lttng_struct_type_statedump(session
,
3198 lttng_kernel_get_type_struct(field
->type
), nesting
);
3201 return lttng_field_name_statedump(session
, field
, nesting
);
3205 * Must be called with sessions_mutex held.
3208 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3209 const struct lttng_kernel_type_variant
*type
,
3211 const char *prev_field_name
)
3213 const char *tag_name
;
3215 uint32_t i
, nr_choices
;
3217 tag_name
= type
->tag_name
;
3219 tag_name
= prev_field_name
;
3223 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3225 if (type
->alignment
!= 0)
3227 ret
= print_tabs(session
, nesting
);
3230 ret
= lttng_metadata_printf(session
,
3231 "variant <_%s> {\n",
3235 nr_choices
= type
->nr_choices
;
3236 for (i
= 0; i
< nr_choices
; i
++) {
3237 const struct lttng_kernel_event_field
*iter_field
;
3239 iter_field
= type
->choices
[i
];
3240 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3244 ret
= print_tabs(session
, nesting
);
3247 ret
= lttng_metadata_printf(session
,
3253 * Must be called with sessions_mutex held.
3256 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3257 const struct lttng_kernel_event_field
*field
,
3259 const char *prev_field_name
)
3263 ret
= _lttng_variant_type_statedump(session
,
3264 lttng_kernel_get_type_variant(field
->type
), nesting
,
3268 return lttng_field_name_statedump(session
, field
, nesting
);
3272 * Must be called with sessions_mutex held.
3275 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3276 const struct lttng_kernel_event_field
*field
,
3280 const struct lttng_kernel_type_array
*array_type
;
3281 const struct lttng_kernel_type_common
*elem_type
;
3283 array_type
= lttng_kernel_get_type_array(field
->type
);
3284 WARN_ON_ONCE(!array_type
);
3286 if (array_type
->alignment
) {
3287 ret
= print_tabs(session
, nesting
);
3290 ret
= lttng_metadata_printf(session
,
3291 "struct { } align(%u) _%s_padding;\n",
3292 array_type
->alignment
* CHAR_BIT
,
3298 * Nested compound types: Only array of structures and variants are
3299 * currently supported.
3301 elem_type
= array_type
->elem_type
;
3302 switch (elem_type
->type
) {
3303 case lttng_kernel_type_integer
:
3304 case lttng_kernel_type_struct
:
3305 case lttng_kernel_type_variant
:
3306 ret
= _lttng_type_statedump(session
, elem_type
,
3307 array_type
->encoding
, nesting
);
3315 ret
= lttng_metadata_printf(session
,
3318 array_type
->length
);
3323 * Must be called with sessions_mutex held.
3326 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3327 const struct lttng_kernel_event_field
*field
,
3329 const char *prev_field_name
)
3332 const char *length_name
;
3333 const struct lttng_kernel_type_sequence
*sequence_type
;
3334 const struct lttng_kernel_type_common
*elem_type
;
3336 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3337 WARN_ON_ONCE(!sequence_type
);
3339 length_name
= sequence_type
->length_name
;
3341 length_name
= prev_field_name
;
3345 if (sequence_type
->alignment
) {
3346 ret
= print_tabs(session
, nesting
);
3349 ret
= lttng_metadata_printf(session
,
3350 "struct { } align(%u) _%s_padding;\n",
3351 sequence_type
->alignment
* CHAR_BIT
,
3358 * Nested compound types: Only array of structures and variants are
3359 * currently supported.
3361 elem_type
= sequence_type
->elem_type
;
3362 switch (elem_type
->type
) {
3363 case lttng_kernel_type_integer
:
3364 case lttng_kernel_type_struct
:
3365 case lttng_kernel_type_variant
:
3366 ret
= _lttng_type_statedump(session
, elem_type
,
3367 sequence_type
->encoding
, nesting
);
3375 ret
= lttng_metadata_printf(session
,
3383 * Must be called with sessions_mutex held.
3386 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3387 const struct lttng_kernel_type_enum
*type
,
3390 const struct lttng_kernel_enum_desc
*enum_desc
;
3391 const struct lttng_kernel_type_common
*container_type
;
3393 unsigned int i
, nr_entries
;
3395 container_type
= type
->container_type
;
3396 if (container_type
->type
!= lttng_kernel_type_integer
) {
3400 enum_desc
= type
->desc
;
3401 nr_entries
= enum_desc
->nr_entries
;
3403 ret
= print_tabs(session
, nesting
);
3406 ret
= lttng_metadata_printf(session
, "enum : ");
3409 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3410 lttng_kernel_string_encoding_none
, 0);
3413 ret
= lttng_metadata_printf(session
, " {\n");
3416 /* Dump all entries */
3417 for (i
= 0; i
< nr_entries
; i
++) {
3418 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3421 ret
= print_tabs(session
, nesting
+ 1);
3424 ret
= lttng_metadata_printf(session
,
3428 len
= strlen(entry
->string
);
3429 /* Escape the character '"' */
3430 for (j
= 0; j
< len
; j
++) {
3431 char c
= entry
->string
[j
];
3435 ret
= lttng_metadata_printf(session
,
3439 ret
= lttng_metadata_printf(session
,
3443 ret
= lttng_metadata_printf(session
,
3450 ret
= lttng_metadata_printf(session
, "\"");
3454 if (entry
->options
.is_auto
) {
3455 ret
= lttng_metadata_printf(session
, ",\n");
3459 ret
= lttng_metadata_printf(session
,
3463 if (entry
->start
.signedness
)
3464 ret
= lttng_metadata_printf(session
,
3465 "%lld", (long long) entry
->start
.value
);
3467 ret
= lttng_metadata_printf(session
,
3468 "%llu", entry
->start
.value
);
3471 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3473 == entry
->end
.value
) {
3474 ret
= lttng_metadata_printf(session
,
3477 if (entry
->end
.signedness
) {
3478 ret
= lttng_metadata_printf(session
,
3480 (long long) entry
->end
.value
);
3482 ret
= lttng_metadata_printf(session
,
3491 ret
= print_tabs(session
, nesting
);
3494 ret
= lttng_metadata_printf(session
, "}");
3500 * Must be called with sessions_mutex held.
3503 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3504 const struct lttng_kernel_event_field
*field
,
3508 const struct lttng_kernel_type_enum
*enum_type
;
3510 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3511 WARN_ON_ONCE(!enum_type
);
3512 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3515 return lttng_field_name_statedump(session
, field
, nesting
);
3519 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3520 const struct lttng_kernel_event_field
*field
,
3525 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3526 lttng_kernel_string_encoding_none
, nesting
);
3529 return lttng_field_name_statedump(session
, field
, nesting
);
3533 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3534 const struct lttng_kernel_type_string
*type
,
3539 /* Default encoding is UTF8 */
3540 ret
= print_tabs(session
, nesting
);
3543 ret
= lttng_metadata_printf(session
,
3545 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3546 " { encoding = ASCII; }" : "");
3551 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3552 const struct lttng_kernel_event_field
*field
,
3555 const struct lttng_kernel_type_string
*string_type
;
3558 string_type
= lttng_kernel_get_type_string(field
->type
);
3559 WARN_ON_ONCE(!string_type
);
3560 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3563 return lttng_field_name_statedump(session
, field
, nesting
);
3567 * Must be called with sessions_mutex held.
3570 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3571 const struct lttng_kernel_type_common
*type
,
3572 enum lttng_kernel_string_encoding parent_encoding
,
3577 switch (type
->type
) {
3578 case lttng_kernel_type_integer
:
3579 ret
= _lttng_integer_type_statedump(session
,
3580 lttng_kernel_get_type_integer(type
),
3581 parent_encoding
, nesting
);
3583 case lttng_kernel_type_enum
:
3584 ret
= _lttng_enum_type_statedump(session
,
3585 lttng_kernel_get_type_enum(type
),
3588 case lttng_kernel_type_string
:
3589 ret
= _lttng_string_type_statedump(session
,
3590 lttng_kernel_get_type_string(type
),
3593 case lttng_kernel_type_struct
:
3594 ret
= _lttng_struct_type_statedump(session
,
3595 lttng_kernel_get_type_struct(type
),
3598 case lttng_kernel_type_variant
:
3599 ret
= _lttng_variant_type_statedump(session
,
3600 lttng_kernel_get_type_variant(type
),
3604 /* Nested arrays and sequences are not supported yet. */
3605 case lttng_kernel_type_array
:
3606 case lttng_kernel_type_sequence
:
3615 * Must be called with sessions_mutex held.
3618 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3619 const struct lttng_kernel_event_field
*field
,
3621 const char **prev_field_name_p
)
3623 const char *prev_field_name
= NULL
;
3626 if (prev_field_name_p
)
3627 prev_field_name
= *prev_field_name_p
;
3628 switch (field
->type
->type
) {
3629 case lttng_kernel_type_integer
:
3630 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3632 case lttng_kernel_type_enum
:
3633 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3635 case lttng_kernel_type_string
:
3636 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3638 case lttng_kernel_type_struct
:
3639 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3641 case lttng_kernel_type_array
:
3642 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3644 case lttng_kernel_type_sequence
:
3645 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3647 case lttng_kernel_type_variant
:
3648 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3655 if (prev_field_name_p
)
3656 *prev_field_name_p
= field
->name
;
3661 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3662 struct lttng_kernel_ctx
*ctx
)
3664 const char *prev_field_name
= NULL
;
3670 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3671 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3673 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3681 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3682 struct lttng_kernel_event_recorder
*event_recorder
)
3684 const char *prev_field_name
= NULL
;
3685 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3689 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3690 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3692 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3700 * Must be called with sessions_mutex held.
3701 * The entire event metadata is printed as a single atomic metadata
3705 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3707 struct lttng_kernel_event_recorder
*event_recorder
;
3708 struct lttng_kernel_channel_buffer
*chan
;
3709 struct lttng_kernel_session
*session
;
3712 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3714 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3715 chan
= event_recorder
->chan
;
3716 session
= chan
->parent
.session
;
3718 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3720 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3723 lttng_metadata_begin(session
);
3725 ret
= lttng_metadata_printf(session
,
3729 " stream_id = %u;\n",
3730 event_recorder
->priv
->parent
.desc
->event_name
,
3731 event_recorder
->priv
->id
,
3732 event_recorder
->chan
->priv
->id
);
3736 ret
= lttng_metadata_printf(session
,
3737 " fields := struct {\n"
3742 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3747 * LTTng space reservation can only reserve multiples of the
3750 ret
= lttng_metadata_printf(session
,
3756 event_recorder
->priv
->metadata_dumped
= 1;
3758 lttng_metadata_end(session
);
3764 * Must be called with sessions_mutex held.
3765 * The entire channel metadata is printed as a single atomic metadata
3769 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3770 struct lttng_kernel_channel_buffer
*chan
)
3774 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3777 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3780 lttng_metadata_begin(session
);
3782 WARN_ON_ONCE(!chan
->priv
->header_type
);
3783 ret
= lttng_metadata_printf(session
,
3786 " event.header := %s;\n"
3787 " packet.context := struct packet_context;\n",
3789 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3790 "struct event_header_large");
3794 if (chan
->priv
->ctx
) {
3795 ret
= lttng_metadata_printf(session
,
3796 " event.context := struct {\n");
3800 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3803 if (chan
->priv
->ctx
) {
3804 ret
= lttng_metadata_printf(session
,
3810 ret
= lttng_metadata_printf(session
,
3813 chan
->priv
->metadata_dumped
= 1;
3815 lttng_metadata_end(session
);
3820 * Must be called with sessions_mutex held.
3823 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3825 return lttng_metadata_printf(session
,
3826 "struct packet_context {\n"
3827 " uint64_clock_monotonic_t timestamp_begin;\n"
3828 " uint64_clock_monotonic_t timestamp_end;\n"
3829 " uint64_t content_size;\n"
3830 " uint64_t packet_size;\n"
3831 " uint64_t packet_seq_num;\n"
3832 " unsigned long events_discarded;\n"
3833 " uint32_t cpu_id;\n"
3840 * id: range: 0 - 30.
3841 * id 31 is reserved to indicate an extended header.
3844 * id: range: 0 - 65534.
3845 * id 65535 is reserved to indicate an extended header.
3847 * Must be called with sessions_mutex held.
3850 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3852 return lttng_metadata_printf(session
,
3853 "struct event_header_compact {\n"
3854 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3857 " uint27_clock_monotonic_t timestamp;\n"
3861 " uint64_clock_monotonic_t timestamp;\n"
3866 "struct event_header_large {\n"
3867 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3870 " uint32_clock_monotonic_t timestamp;\n"
3874 " uint64_clock_monotonic_t timestamp;\n"
3878 lttng_alignof(uint32_t) * CHAR_BIT
,
3879 lttng_alignof(uint16_t) * CHAR_BIT
3884 * Approximation of NTP time of day to clock monotonic correlation,
3885 * taken at start of trace.
3886 * Yes, this is only an approximation. Yes, we can (and will) do better
3887 * in future versions.
3888 * This function may return a negative offset. It may happen if the
3889 * system sets the REALTIME clock to 0 after boot.
3891 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3895 int64_t measure_clock_offset(void)
3897 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3898 uint64_t tcf
= trace_clock_freq();
3900 unsigned long flags
;
3901 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3902 struct timespec64 rts
= { 0, 0 };
3904 struct timespec rts
= { 0, 0 };
3907 /* Disable interrupts to increase correlation precision. */
3908 local_irq_save(flags
);
3909 monotonic
[0] = trace_clock_read64();
3910 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3911 ktime_get_real_ts64(&rts
);
3913 getnstimeofday(&rts
);
3915 monotonic
[1] = trace_clock_read64();
3916 local_irq_restore(flags
);
3918 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3919 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3920 if (tcf
== NSEC_PER_SEC
) {
3921 realtime
+= rts
.tv_nsec
;
3923 uint64_t n
= rts
.tv_nsec
* tcf
;
3925 do_div(n
, NSEC_PER_SEC
);
3928 offset
= (int64_t) realtime
- monotonic_avg
;
3933 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3941 while (cur
!= '\0') {
3944 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3948 ret
= lttng_metadata_printf(session
, "%c", '\\');
3951 /* We still print the current char */
3954 ret
= lttng_metadata_printf(session
, "%c", cur
);
3968 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3969 const char *field_value
)
3973 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3977 ret
= print_escaped_ctf_string(session
, field_value
);
3981 ret
= lttng_metadata_printf(session
, "\";\n");
3988 * Output metadata into this session's metadata buffers.
3989 * Must be called with sessions_mutex held.
3992 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3994 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3995 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3996 const char *product_uuid
;
3997 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3998 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
4001 if (!LTTNG_READ_ONCE(session
->active
))
4004 lttng_metadata_begin(session
);
4006 if (session
->priv
->metadata_dumped
)
4009 snprintf(uuid_s
, sizeof(uuid_s
),
4010 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
4011 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
4012 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
4013 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
4014 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
4016 ret
= lttng_metadata_printf(session
,
4017 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4018 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4019 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4020 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4021 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4022 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4023 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4029 " byte_order = %s;\n"
4030 " packet.header := struct {\n"
4031 " uint32_t magic;\n"
4032 " uint8_t uuid[16];\n"
4033 " uint32_t stream_id;\n"
4034 " uint64_t stream_instance_id;\n"
4037 lttng_alignof(uint8_t) * CHAR_BIT
,
4038 lttng_alignof(uint16_t) * CHAR_BIT
,
4039 lttng_alignof(uint32_t) * CHAR_BIT
,
4040 lttng_alignof(uint64_t) * CHAR_BIT
,
4041 sizeof(unsigned long) * CHAR_BIT
,
4042 lttng_alignof(unsigned long) * CHAR_BIT
,
4046 #if __BYTE_ORDER == __BIG_ENDIAN
4055 ret
= lttng_metadata_printf(session
,
4057 " hostname = \"%s\";\n"
4058 " domain = \"kernel\";\n"
4059 " sysname = \"%s\";\n"
4060 " kernel_release = \"%s\";\n"
4061 " kernel_version = \"%s\";\n"
4062 " tracer_name = \"lttng-modules\";\n"
4063 " tracer_major = %d;\n"
4064 " tracer_minor = %d;\n"
4065 " tracer_patchlevel = %d;\n"
4066 " trace_buffering_scheme = \"global\";\n",
4067 current
->nsproxy
->uts_ns
->name
.nodename
,
4071 LTTNG_MODULES_MAJOR_VERSION
,
4072 LTTNG_MODULES_MINOR_VERSION
,
4073 LTTNG_MODULES_PATCHLEVEL_VERSION
4078 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4081 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4082 session
->priv
->creation_time
);
4086 /* Add the product UUID to the 'env' section */
4087 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4089 ret
= lttng_metadata_printf(session
,
4090 " product_uuid = \"%s\";\n",
4097 /* Close the 'env' section */
4098 ret
= lttng_metadata_printf(session
, "};\n\n");
4102 ret
= lttng_metadata_printf(session
,
4104 " name = \"%s\";\n",
4110 if (!trace_clock_uuid(clock_uuid_s
)) {
4111 ret
= lttng_metadata_printf(session
,
4112 " uuid = \"%s\";\n",
4119 ret
= lttng_metadata_printf(session
,
4120 " description = \"%s\";\n"
4121 " freq = %llu; /* Frequency, in Hz */\n"
4122 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4125 trace_clock_description(),
4126 (unsigned long long) trace_clock_freq(),
4127 (long long) measure_clock_offset()
4132 ret
= lttng_metadata_printf(session
,
4133 "typealias integer {\n"
4134 " size = 27; align = 1; signed = false;\n"
4135 " map = clock.%s.value;\n"
4136 "} := uint27_clock_monotonic_t;\n"
4138 "typealias integer {\n"
4139 " size = 32; align = %u; signed = false;\n"
4140 " map = clock.%s.value;\n"
4141 "} := uint32_clock_monotonic_t;\n"
4143 "typealias integer {\n"
4144 " size = 64; align = %u; signed = false;\n"
4145 " map = clock.%s.value;\n"
4146 "} := uint64_clock_monotonic_t;\n\n",
4148 lttng_alignof(uint32_t) * CHAR_BIT
,
4150 lttng_alignof(uint64_t) * CHAR_BIT
,
4156 ret
= _lttng_stream_packet_context_declare(session
);
4160 ret
= _lttng_event_header_declare(session
);
4165 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4166 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4171 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4172 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
4176 session
->priv
->metadata_dumped
= 1;
4178 lttng_metadata_end(session
);
4183 * lttng_transport_register - LTT transport registration
4184 * @transport: transport structure
4186 * Registers a transport which can be used as output to extract the data out of
4187 * LTTng. The module calling this registration function must ensure that no
4188 * trap-inducing code will be executed by the transport functions. E.g.
4189 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4190 * is made visible to the transport function. This registration acts as a
4191 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4192 * after its registration must it synchronize the TLBs.
4194 void lttng_transport_register(struct lttng_transport
*transport
)
4197 * Make sure no page fault can be triggered by the module about to be
4198 * registered. We deal with this here so we don't have to call
4199 * vmalloc_sync_mappings() in each module's init.
4201 wrapper_vmalloc_sync_mappings();
4203 mutex_lock(&sessions_mutex
);
4204 list_add_tail(&transport
->node
, <tng_transport_list
);
4205 mutex_unlock(&sessions_mutex
);
4207 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4210 * lttng_transport_unregister - LTT transport unregistration
4211 * @transport: transport structure
4213 void lttng_transport_unregister(struct lttng_transport
*transport
)
4215 mutex_lock(&sessions_mutex
);
4216 list_del(&transport
->node
);
4217 mutex_unlock(&sessions_mutex
);
4219 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4221 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4224 * Make sure no page fault can be triggered by the module about to be
4225 * registered. We deal with this here so we don't have to call
4226 * vmalloc_sync_mappings() in each module's init.
4228 wrapper_vmalloc_sync_mappings();
4230 mutex_lock(&sessions_mutex
);
4231 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4232 mutex_unlock(&sessions_mutex
);
4234 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4236 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4238 mutex_lock(&sessions_mutex
);
4239 list_del(&transport
->node
);
4240 mutex_unlock(&sessions_mutex
);
4242 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4244 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4246 enum cpuhp_state lttng_hp_prepare
;
4247 enum cpuhp_state lttng_hp_online
;
4249 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4251 struct lttng_cpuhp_node
*lttng_node
;
4253 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4254 switch (lttng_node
->component
) {
4255 case LTTNG_RING_BUFFER_FRONTEND
:
4257 case LTTNG_RING_BUFFER_BACKEND
:
4258 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4259 case LTTNG_RING_BUFFER_ITER
:
4261 case LTTNG_CONTEXT_PERF_COUNTERS
:
4268 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4270 struct lttng_cpuhp_node
*lttng_node
;
4272 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4273 switch (lttng_node
->component
) {
4274 case LTTNG_RING_BUFFER_FRONTEND
:
4275 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4276 case LTTNG_RING_BUFFER_BACKEND
:
4278 case LTTNG_RING_BUFFER_ITER
:
4280 case LTTNG_CONTEXT_PERF_COUNTERS
:
4281 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4287 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4289 struct lttng_cpuhp_node
*lttng_node
;
4291 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4292 switch (lttng_node
->component
) {
4293 case LTTNG_RING_BUFFER_FRONTEND
:
4294 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4295 case LTTNG_RING_BUFFER_BACKEND
:
4297 case LTTNG_RING_BUFFER_ITER
:
4298 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4299 case LTTNG_CONTEXT_PERF_COUNTERS
:
4300 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4306 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4308 struct lttng_cpuhp_node
*lttng_node
;
4310 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4311 switch (lttng_node
->component
) {
4312 case LTTNG_RING_BUFFER_FRONTEND
:
4313 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4314 case LTTNG_RING_BUFFER_BACKEND
:
4316 case LTTNG_RING_BUFFER_ITER
:
4318 case LTTNG_CONTEXT_PERF_COUNTERS
:
4325 static int __init
lttng_init_cpu_hotplug(void)
4329 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4330 lttng_hotplug_prepare
,
4331 lttng_hotplug_dead
);
4335 lttng_hp_prepare
= ret
;
4336 lttng_rb_set_hp_prepare(ret
);
4338 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4339 lttng_hotplug_online
,
4340 lttng_hotplug_offline
);
4342 cpuhp_remove_multi_state(lttng_hp_prepare
);
4343 lttng_hp_prepare
= 0;
4346 lttng_hp_online
= ret
;
4347 lttng_rb_set_hp_online(ret
);
4352 static void __exit
lttng_exit_cpu_hotplug(void)
4354 lttng_rb_set_hp_online(0);
4355 cpuhp_remove_multi_state(lttng_hp_online
);
4356 lttng_rb_set_hp_prepare(0);
4357 cpuhp_remove_multi_state(lttng_hp_prepare
);
4360 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4361 static int lttng_init_cpu_hotplug(void)
4365 static void lttng_exit_cpu_hotplug(void)
4368 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4370 static int __init
lttng_events_init(void)
4374 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4377 ret
= wrapper_get_pfnblock_flags_mask_init();
4380 ret
= wrapper_get_pageblock_flags_mask_init();
4383 ret
= lttng_probes_init();
4386 ret
= lttng_context_init();
4389 ret
= lttng_tracepoint_init();
4392 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4393 if (!event_recorder_cache
) {
4395 goto error_kmem_event_recorder
;
4397 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4398 if (!event_recorder_private_cache
) {
4400 goto error_kmem_event_recorder_private
;
4402 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4403 if (!event_notifier_cache
) {
4405 goto error_kmem_event_notifier
;
4407 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4408 if (!event_notifier_private_cache
) {
4410 goto error_kmem_event_notifier_private
;
4412 ret
= lttng_abi_init();
4415 ret
= lttng_logger_init();
4418 ret
= lttng_init_cpu_hotplug();
4421 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4422 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4423 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4424 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4425 LTTNG_MODULES_EXTRAVERSION
,
4427 #ifdef LTTNG_EXTRA_VERSION_GIT
4428 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4432 #ifdef LTTNG_EXTRA_VERSION_NAME
4433 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4437 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4438 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4439 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4443 lttng_logger_exit();
4447 kmem_cache_destroy(event_notifier_private_cache
);
4448 error_kmem_event_notifier_private
:
4449 kmem_cache_destroy(event_notifier_cache
);
4450 error_kmem_event_notifier
:
4451 kmem_cache_destroy(event_recorder_private_cache
);
4452 error_kmem_event_recorder_private
:
4453 kmem_cache_destroy(event_recorder_cache
);
4454 error_kmem_event_recorder
:
4455 lttng_tracepoint_exit();
4457 lttng_context_exit();
4458 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4459 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4460 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4461 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4462 LTTNG_MODULES_EXTRAVERSION
,
4464 #ifdef LTTNG_EXTRA_VERSION_GIT
4465 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4469 #ifdef LTTNG_EXTRA_VERSION_NAME
4470 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4477 module_init(lttng_events_init
);
4479 static void __exit
lttng_events_exit(void)
4481 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4483 lttng_exit_cpu_hotplug();
4484 lttng_logger_exit();
4486 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4487 lttng_session_destroy(session_priv
->pub
);
4488 kmem_cache_destroy(event_recorder_cache
);
4489 kmem_cache_destroy(event_recorder_private_cache
);
4490 kmem_cache_destroy(event_notifier_cache
);
4491 kmem_cache_destroy(event_notifier_private_cache
);
4492 lttng_tracepoint_exit();
4493 lttng_context_exit();
4494 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4495 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4496 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4497 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4498 LTTNG_MODULES_EXTRAVERSION
,
4500 #ifdef LTTNG_EXTRA_VERSION_GIT
4501 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4505 #ifdef LTTNG_EXTRA_VERSION_NAME
4506 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4512 module_exit(lttng_events_exit
);
4514 #include <generated/patches.h>
4515 #ifdef LTTNG_EXTRA_VERSION_GIT
4516 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4518 #ifdef LTTNG_EXTRA_VERSION_NAME
4519 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4521 MODULE_LICENSE("GPL and additional rights");
4522 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4523 MODULE_DESCRIPTION("LTTng tracer");
4524 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4525 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4526 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4527 LTTNG_MODULES_EXTRAVERSION
);