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 list_add(&event
->priv
->node
, event_list_head
);
1470 hlist_add_head(&event
->priv
->hlist_node
, head
);
1472 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1474 goto register_error
;
1475 return event_notifier
;
1478 lttng_kernel_event_free(event
);
1482 return ERR_PTR(ret
);
1485 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1486 const struct lttng_kernel_event_desc
*event_desc
)
1488 switch (event_enabler
->enabler_type
) {
1489 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1491 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1492 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1493 struct lttng_kernel_event_recorder
*event_recorder
;
1495 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1496 if (!event_recorder
)
1498 return &event_recorder
->parent
;
1500 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1502 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1503 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1504 struct lttng_kernel_event_notifier
*event_notifier
;
1506 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1507 if (!event_notifier
)
1509 return &event_notifier
->parent
;
1516 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1517 const struct lttng_kernel_event_desc
*event_desc
)
1519 struct lttng_kernel_event_common
*event
;
1521 mutex_lock(&sessions_mutex
);
1522 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1523 mutex_unlock(&sessions_mutex
);
1529 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1530 const size_t *dim_indexes
, int32_t cpu
,
1531 int64_t *val
, bool *overflow
, bool *underflow
)
1533 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1534 cpu
, val
, overflow
, underflow
);
1537 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1538 const size_t *dim_indexes
, int64_t *val
,
1539 bool *overflow
, bool *underflow
)
1541 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1542 val
, overflow
, underflow
);
1545 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1546 const size_t *dim_indexes
)
1548 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1551 /* Only used for tracepoints for now. */
1553 void register_event(struct lttng_kernel_event_common
*event
)
1555 const struct lttng_kernel_event_desc
*desc
;
1558 if (event
->priv
->registered
)
1561 desc
= event
->priv
->desc
;
1562 switch (event
->priv
->instrumentation
) {
1563 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1564 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1565 desc
->tp_class
->probe_callback
,
1569 case LTTNG_KERNEL_ABI_SYSCALL
:
1570 ret
= lttng_syscall_filter_enable_event(event
);
1573 case LTTNG_KERNEL_ABI_KPROBE
:
1575 case LTTNG_KERNEL_ABI_UPROBE
:
1579 case LTTNG_KERNEL_ABI_KRETPROBE
:
1580 switch (event
->type
) {
1581 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1584 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1590 case LTTNG_KERNEL_ABI_FUNCTION
:
1592 case LTTNG_KERNEL_ABI_NOOP
:
1598 event
->priv
->registered
= 1;
1601 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1603 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1604 const struct lttng_kernel_event_desc
*desc
;
1607 if (!event_priv
->registered
)
1610 desc
= event_priv
->desc
;
1611 switch (event_priv
->instrumentation
) {
1612 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1613 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1614 event_priv
->desc
->tp_class
->probe_callback
,
1618 case LTTNG_KERNEL_ABI_KPROBE
:
1619 lttng_kprobes_unregister_event(event
);
1623 case LTTNG_KERNEL_ABI_KRETPROBE
:
1624 switch (event
->type
) {
1625 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1626 lttng_kretprobes_unregister(event
);
1629 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1635 case LTTNG_KERNEL_ABI_SYSCALL
:
1636 ret
= lttng_syscall_filter_disable_event(event
);
1639 case LTTNG_KERNEL_ABI_NOOP
:
1640 switch (event
->type
) {
1641 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1644 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1650 case LTTNG_KERNEL_ABI_UPROBE
:
1651 lttng_uprobes_unregister_event(event
);
1655 case LTTNG_KERNEL_ABI_FUNCTION
:
1661 event_priv
->registered
= 0;
1666 * Only used internally at session destruction.
1669 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1671 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1672 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1674 lttng_free_event_filter_runtime(event
);
1675 /* Free event enabler refs */
1676 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1677 &event_priv
->enablers_ref_head
, node
)
1680 switch (event
->type
) {
1681 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1683 struct lttng_kernel_event_recorder
*event_recorder
=
1684 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1686 switch (event_priv
->instrumentation
) {
1687 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1688 lttng_event_desc_put(event_priv
->desc
);
1691 case LTTNG_KERNEL_ABI_KPROBE
:
1692 module_put(event_priv
->desc
->owner
);
1693 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1696 case LTTNG_KERNEL_ABI_KRETPROBE
:
1697 module_put(event_priv
->desc
->owner
);
1698 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1701 case LTTNG_KERNEL_ABI_SYSCALL
:
1704 case LTTNG_KERNEL_ABI_UPROBE
:
1705 module_put(event_priv
->desc
->owner
);
1706 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1709 case LTTNG_KERNEL_ABI_FUNCTION
:
1711 case LTTNG_KERNEL_ABI_NOOP
:
1716 list_del(&event_recorder
->priv
->parent
.node
);
1717 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1718 kmem_cache_free(event_recorder_cache
, event_recorder
);
1721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1723 struct lttng_kernel_event_notifier
*event_notifier
=
1724 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1726 switch (event_notifier
->priv
->parent
.instrumentation
) {
1727 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1728 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1731 case LTTNG_KERNEL_ABI_KPROBE
:
1732 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1733 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1736 case LTTNG_KERNEL_ABI_SYSCALL
:
1739 case LTTNG_KERNEL_ABI_UPROBE
:
1740 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1741 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1744 case LTTNG_KERNEL_ABI_KRETPROBE
:
1746 case LTTNG_KERNEL_ABI_FUNCTION
:
1748 case LTTNG_KERNEL_ABI_NOOP
:
1753 list_del(&event_notifier
->priv
->parent
.node
);
1754 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1755 kmem_cache_free(event_notifier_cache
, event_notifier
);
1763 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1764 enum tracker_type tracker_type
)
1766 switch (tracker_type
) {
1768 return &session
->pid_tracker
;
1770 return &session
->vpid_tracker
;
1772 return &session
->uid_tracker
;
1774 return &session
->vuid_tracker
;
1776 return &session
->gid_tracker
;
1778 return &session
->vgid_tracker
;
1785 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1786 enum tracker_type tracker_type
, int id
)
1788 struct lttng_kernel_id_tracker
*tracker
;
1791 tracker
= get_tracker(session
, tracker_type
);
1796 mutex_lock(&sessions_mutex
);
1798 /* track all ids: destroy tracker. */
1799 lttng_id_tracker_destroy(tracker
, true);
1802 ret
= lttng_id_tracker_add(tracker
, id
);
1804 mutex_unlock(&sessions_mutex
);
1808 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1809 enum tracker_type tracker_type
, int id
)
1811 struct lttng_kernel_id_tracker
*tracker
;
1814 tracker
= get_tracker(session
, tracker_type
);
1819 mutex_lock(&sessions_mutex
);
1821 /* untrack all ids: replace by empty tracker. */
1822 ret
= lttng_id_tracker_empty_set(tracker
);
1824 ret
= lttng_id_tracker_del(tracker
, id
);
1826 mutex_unlock(&sessions_mutex
);
1831 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1833 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1834 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1835 struct lttng_id_hash_node
*e
;
1838 mutex_lock(&sessions_mutex
);
1840 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1841 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1843 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1849 /* ID tracker disabled. */
1850 if (iter
>= *pos
&& iter
== 0) {
1851 return id_tracker_p
; /* empty tracker */
1859 /* Called with sessions_mutex held. */
1861 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1863 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1864 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1865 struct lttng_id_hash_node
*e
;
1870 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1871 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1873 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1874 if (iter
++ >= *ppos
)
1879 /* ID tracker disabled. */
1880 if (iter
>= *ppos
&& iter
== 0)
1881 return p
; /* empty tracker */
1890 void id_list_stop(struct seq_file
*m
, void *p
)
1892 mutex_unlock(&sessions_mutex
);
1896 int id_list_show(struct seq_file
*m
, void *p
)
1898 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1899 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1902 if (p
== id_tracker_p
) {
1903 /* Tracker disabled. */
1906 const struct lttng_id_hash_node
*e
= p
;
1908 id
= lttng_id_tracker_get_node_id(e
);
1910 switch (id_tracker
->priv
->tracker_type
) {
1912 seq_printf(m
, "process { pid = %d; };\n", id
);
1915 seq_printf(m
, "process { vpid = %d; };\n", id
);
1918 seq_printf(m
, "user { uid = %d; };\n", id
);
1921 seq_printf(m
, "user { vuid = %d; };\n", id
);
1924 seq_printf(m
, "group { gid = %d; };\n", id
);
1927 seq_printf(m
, "group { vgid = %d; };\n", id
);
1930 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1936 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1937 .start
= id_list_start
,
1938 .next
= id_list_next
,
1939 .stop
= id_list_stop
,
1940 .show
= id_list_show
,
1944 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1946 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1950 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1952 struct seq_file
*m
= file
->private_data
;
1953 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1956 WARN_ON_ONCE(!id_tracker
);
1957 ret
= seq_release(inode
, file
);
1959 fput(id_tracker
->priv
->session
->priv
->file
);
1963 const struct file_operations lttng_tracker_ids_list_fops
= {
1964 .owner
= THIS_MODULE
,
1965 .open
= lttng_tracker_ids_list_open
,
1967 .llseek
= seq_lseek
,
1968 .release
= lttng_tracker_ids_list_release
,
1971 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1972 enum tracker_type tracker_type
)
1974 struct file
*tracker_ids_list_file
;
1978 file_fd
= lttng_get_unused_fd();
1984 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1985 <tng_tracker_ids_list_fops
,
1987 if (IS_ERR(tracker_ids_list_file
)) {
1988 ret
= PTR_ERR(tracker_ids_list_file
);
1991 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1993 goto refcount_error
;
1995 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1998 m
= tracker_ids_list_file
->private_data
;
2000 m
->private = get_tracker(session
, tracker_type
);
2001 BUG_ON(!m
->private);
2002 fd_install(file_fd
, tracker_ids_list_file
);
2007 atomic_long_dec(&session
->priv
->file
->f_count
);
2009 fput(tracker_ids_list_file
);
2011 put_unused_fd(file_fd
);
2017 * Enabler management.
2020 int lttng_match_enabler_star_glob(const char *desc_name
,
2021 const char *pattern
)
2023 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
2024 desc_name
, LTTNG_SIZE_MAX
))
2030 int lttng_match_enabler_name(const char *desc_name
,
2033 if (strcmp(desc_name
, name
))
2039 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
2040 struct lttng_event_enabler_common
*enabler
)
2042 const char *desc_name
, *enabler_name
;
2043 bool compat
= false, entry
= false;
2045 enabler_name
= enabler
->event_param
.name
;
2046 switch (enabler
->event_param
.instrumentation
) {
2047 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2048 desc_name
= desc
->event_name
;
2049 switch (enabler
->format_type
) {
2050 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2051 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2052 case LTTNG_ENABLER_FORMAT_NAME
:
2053 return lttng_match_enabler_name(desc_name
, enabler_name
);
2059 case LTTNG_KERNEL_ABI_SYSCALL
:
2060 desc_name
= desc
->event_name
;
2061 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2062 desc_name
+= strlen("compat_");
2065 if (!strncmp(desc_name
, "syscall_exit_",
2066 strlen("syscall_exit_"))) {
2067 desc_name
+= strlen("syscall_exit_");
2068 } else if (!strncmp(desc_name
, "syscall_entry_",
2069 strlen("syscall_entry_"))) {
2070 desc_name
+= strlen("syscall_entry_");
2076 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2077 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2079 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2083 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2090 switch (enabler
->event_param
.u
.syscall
.abi
) {
2091 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2093 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2097 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2104 switch (enabler
->event_param
.u
.syscall
.match
) {
2105 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2106 switch (enabler
->format_type
) {
2107 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2108 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2109 case LTTNG_ENABLER_FORMAT_NAME
:
2110 return lttng_match_enabler_name(desc_name
, enabler_name
);
2115 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2116 return -EINVAL
; /* Not implemented. */
2128 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2129 struct lttng_event_enabler_common
*enabler
)
2133 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2141 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2142 struct lttng_kernel_event_common
*event
)
2144 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2147 switch (event_enabler
->enabler_type
) {
2148 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2150 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2151 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2152 struct lttng_kernel_event_recorder
*event_recorder
=
2153 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2155 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2156 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2161 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2163 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2164 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2165 struct lttng_kernel_event_notifier
*event_notifier
=
2166 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2168 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2169 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2170 && event
->priv
->user_token
== event_enabler
->user_token
)
2181 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2182 const struct lttng_kernel_event_desc
*desc
,
2183 struct lttng_kernel_event_common
*event
)
2185 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2188 switch (event_enabler
->enabler_type
) {
2189 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2191 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2192 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2193 struct lttng_kernel_event_recorder
*event_recorder
=
2194 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2196 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2201 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2203 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2204 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2205 struct lttng_kernel_event_notifier
*event_notifier
=
2206 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2208 if (event
->priv
->desc
== desc
2209 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2210 && event
->priv
->user_token
== event_enabler
->user_token
)
2221 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2222 const char *event_name
,
2223 struct lttng_kernel_event_common
*event
)
2225 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2228 switch (event_enabler
->enabler_type
) {
2229 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2231 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2232 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2233 struct lttng_kernel_event_recorder
*event_recorder
=
2234 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2236 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2237 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2242 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2244 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2245 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2246 struct lttng_kernel_event_notifier
*event_notifier
=
2247 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2249 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2250 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2251 && event
->priv
->user_token
== event_enabler
->user_token
)
2263 struct lttng_enabler_ref
*lttng_enabler_ref(
2264 struct list_head
*enablers_ref_list
,
2265 struct lttng_event_enabler_common
*enabler
)
2267 struct lttng_enabler_ref
*enabler_ref
;
2269 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2270 if (enabler_ref
->ref
== enabler
)
2277 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2279 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2280 struct lttng_kernel_probe_desc
*probe_desc
;
2281 const struct lttng_kernel_event_desc
*desc
;
2282 struct list_head
*probe_list
;
2285 probe_list
= lttng_get_probe_list_head();
2287 * For each probe event, if we find that a probe event matches
2288 * our enabler, create an associated lttng_event if not
2291 list_for_each_entry(probe_desc
, probe_list
, head
) {
2292 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2294 struct hlist_head
*head
;
2295 struct lttng_kernel_event_common
*event
;
2296 struct lttng_kernel_event_common_private
*event_priv
;
2298 desc
= probe_desc
->event_desc
[i
];
2299 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2303 * Check if already created.
2305 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2306 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2307 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2314 * We need to create an event for this event probe.
2316 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2318 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2319 probe_desc
->event_desc
[i
]->event_name
);
2326 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2330 ret
= lttng_syscalls_register_event(event_enabler
);
2335 * Create event if it is missing and present in the list of tracepoint probes.
2336 * Should be called with sessions mutex held.
2339 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2341 switch (event_enabler
->event_param
.instrumentation
) {
2342 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2343 lttng_create_tracepoint_event_if_missing(event_enabler
);
2346 case LTTNG_KERNEL_ABI_SYSCALL
:
2347 lttng_create_syscall_event_if_missing(event_enabler
);
2357 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2358 struct lttng_kernel_event_common
*event
)
2360 /* Link filter bytecodes if not linked yet. */
2361 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2362 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2366 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2367 struct lttng_kernel_event_common
*event
)
2369 switch (event_enabler
->enabler_type
) {
2370 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2372 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2374 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2375 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2376 struct lttng_kernel_event_notifier
*event_notifier
=
2377 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2379 /* Link capture bytecodes if not linked yet. */
2380 lttng_enabler_link_bytecode(event
->priv
->desc
,
2381 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2382 &event_notifier_enabler
->capture_bytecode_head
);
2383 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2392 * Create events associated with an event_enabler (if not already present),
2393 * and add backward reference from the event to the enabler.
2394 * Should be called with sessions mutex held.
2397 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2399 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2400 struct lttng_kernel_event_common_private
*event_priv
;
2402 lttng_syscall_table_set_wildcard_all(event_enabler
);
2404 /* First ensure that probe events are created for this enabler. */
2405 lttng_create_event_if_missing(event_enabler
);
2407 /* Link the created event with its associated enabler. */
2408 list_for_each_entry(event_priv
, event_list_head
, node
) {
2409 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2410 struct lttng_enabler_ref
*enabler_ref
;
2412 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2415 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2418 * If no backward ref, create it.
2419 * Add backward ref from event_notifier to enabler.
2421 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2425 enabler_ref
->ref
= event_enabler
;
2426 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2429 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2430 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2436 * Called at module load: connect the probe on all enablers matching
2438 * Called with sessions lock held.
2440 int lttng_fix_pending_events(void)
2442 struct lttng_kernel_session_private
*session_priv
;
2444 list_for_each_entry(session_priv
, &sessions
, list
)
2445 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2449 static bool lttng_event_notifier_group_has_active_event_notifiers(
2450 struct lttng_event_notifier_group
*event_notifier_group
)
2452 struct lttng_event_enabler_common
*event_enabler
;
2454 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2455 if (event_enabler
->enabled
)
2461 bool lttng_event_notifier_active(void)
2463 struct lttng_event_notifier_group
*event_notifier_group
;
2465 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2466 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2472 int lttng_fix_pending_event_notifiers(void)
2474 struct lttng_event_notifier_group
*event_notifier_group
;
2476 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2477 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2481 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2482 enum lttng_enabler_format_type format_type
,
2483 struct lttng_kernel_abi_event
*event_param
,
2484 struct lttng_kernel_channel_buffer
*chan
)
2486 struct lttng_event_recorder_enabler
*event_enabler
;
2488 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2491 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2492 event_enabler
->parent
.format_type
= format_type
;
2493 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2494 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2495 sizeof(event_enabler
->parent
.event_param
));
2496 event_enabler
->chan
= chan
;
2498 event_enabler
->parent
.enabled
= 0;
2499 return event_enabler
;
2502 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2503 struct lttng_event_recorder_enabler
*event_enabler
)
2505 mutex_lock(&sessions_mutex
);
2506 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2507 event_enabler
->parent
.published
= true;
2508 lttng_session_lazy_sync_event_enablers(session
);
2509 mutex_unlock(&sessions_mutex
);
2512 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2514 mutex_lock(&sessions_mutex
);
2515 event_enabler
->enabled
= 1;
2516 lttng_event_enabler_sync(event_enabler
);
2517 mutex_unlock(&sessions_mutex
);
2521 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2523 mutex_lock(&sessions_mutex
);
2524 event_enabler
->enabled
= 0;
2525 lttng_event_enabler_sync(event_enabler
);
2526 mutex_unlock(&sessions_mutex
);
2531 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2532 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2534 struct lttng_kernel_bytecode_node
*bytecode_node
;
2535 uint32_t bytecode_len
;
2538 ret
= get_user(bytecode_len
, &bytecode
->len
);
2541 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2545 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2546 sizeof(*bytecode
) + bytecode_len
);
2550 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2551 bytecode_node
->enabler
= enabler
;
2552 /* Enforce length based on allocated size */
2553 bytecode_node
->bc
.len
= bytecode_len
;
2554 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2559 lttng_kvfree(bytecode_node
);
2563 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2564 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2567 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2570 lttng_event_enabler_sync(event_enabler
);
2577 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2578 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2581 switch (event
->priv
->instrumentation
) {
2582 case LTTNG_KERNEL_ABI_UPROBE
:
2583 return lttng_uprobes_event_add_callsite(event
, callsite
);
2590 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2592 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2594 /* Destroy filter bytecode */
2595 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2596 &enabler
->filter_bytecode_head
, node
) {
2597 lttng_kvfree(filter_node
);
2601 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2603 lttng_enabler_destroy(event_enabler
);
2604 if (event_enabler
->published
)
2605 list_del(&event_enabler
->node
);
2607 switch (event_enabler
->enabler_type
) {
2608 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2610 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2611 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2613 kfree(event_recorder_enabler
);
2616 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2618 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2619 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2621 kfree(event_notifier_enabler
);
2629 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2630 enum lttng_enabler_format_type format_type
,
2631 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2632 struct lttng_event_notifier_group
*event_notifier_group
)
2634 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2636 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2637 if (!event_notifier_enabler
)
2640 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2641 event_notifier_enabler
->parent
.format_type
= format_type
;
2642 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2643 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2645 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2646 event_notifier_enabler
->num_captures
= 0;
2648 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2649 sizeof(event_notifier_enabler
->parent
.event_param
));
2651 event_notifier_enabler
->parent
.enabled
= 0;
2652 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2653 event_notifier_enabler
->group
= event_notifier_group
;
2654 return event_notifier_enabler
;
2657 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2658 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2660 mutex_lock(&sessions_mutex
);
2661 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2662 event_notifier_enabler
->parent
.published
= true;
2663 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2664 mutex_unlock(&sessions_mutex
);
2667 int lttng_event_notifier_enabler_enable(
2668 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2670 mutex_lock(&sessions_mutex
);
2671 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2672 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2673 mutex_unlock(&sessions_mutex
);
2677 int lttng_event_notifier_enabler_disable(
2678 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2680 mutex_lock(&sessions_mutex
);
2681 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2682 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2683 mutex_unlock(&sessions_mutex
);
2687 int lttng_event_notifier_enabler_attach_capture_bytecode(
2688 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2689 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2691 struct lttng_kernel_bytecode_node
*bytecode_node
;
2692 struct lttng_event_enabler_common
*enabler
=
2693 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2694 uint32_t bytecode_len
;
2697 ret
= get_user(bytecode_len
, &bytecode
->len
);
2701 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2706 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2707 sizeof(*bytecode
) + bytecode_len
);
2711 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2712 bytecode_node
->enabler
= enabler
;
2714 /* Enforce length based on allocated size */
2715 bytecode_node
->bc
.len
= bytecode_len
;
2716 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2718 event_notifier_enabler
->num_captures
++;
2720 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2724 lttng_kvfree(bytecode_node
);
2730 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2732 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2733 struct lttng_kernel_bytecode_runtime
*runtime
;
2734 struct lttng_enabler_ref
*enabler_ref
;
2736 /* Check if has enablers without bytecode enabled */
2737 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2738 if (enabler_ref
->ref
->enabled
2739 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2740 has_enablers_without_filter_bytecode
= 1;
2744 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2746 /* Enable filters */
2747 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2748 lttng_bytecode_sync_state(runtime
);
2751 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2755 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2757 switch (event
->type
) {
2758 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2760 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2762 struct lttng_kernel_event_notifier
*event_notifier
=
2763 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2764 struct lttng_kernel_bytecode_runtime
*runtime
;
2765 int nr_captures
= 0;
2767 /* Enable captures */
2768 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2769 lttng_bytecode_sync_state(runtime
);
2772 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2781 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2783 struct lttng_enabler_ref
*enabler_ref
;
2784 bool enabled
= false;
2786 switch (event
->priv
->instrumentation
) {
2787 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2789 case LTTNG_KERNEL_ABI_SYSCALL
:
2791 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2792 if (enabler_ref
->ref
->enabled
) {
2803 switch (event
->type
) {
2804 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2806 struct lttng_kernel_event_recorder
*event_recorder
=
2807 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2810 * Enabled state is based on union of enablers, with
2811 * intersection of session and channel transient enable
2814 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2816 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2825 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2827 switch (event
->priv
->instrumentation
) {
2828 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2830 case LTTNG_KERNEL_ABI_SYSCALL
:
2834 /* Not handled with lazy sync. */
2840 * Should be called with sessions mutex held.
2843 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2844 struct list_head
*event_list
)
2846 struct lttng_kernel_event_common_private
*event_priv
;
2847 struct lttng_event_enabler_common
*event_enabler
;
2849 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2850 lttng_event_enabler_ref_events(event_enabler
);
2853 * For each event, if at least one of its enablers is enabled,
2854 * and its channel and session transient states are enabled, we
2855 * enable the event, else we disable it.
2857 list_for_each_entry(event_priv
, event_list
, node
) {
2858 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2861 if (!lttng_event_is_lazy_sync(event
))
2864 enabled
= lttng_get_event_enabled_state(event
);
2865 WRITE_ONCE(event
->enabled
, enabled
);
2867 * Sync tracepoint registration with event enabled state.
2870 register_event(event
);
2872 _lttng_event_unregister(event
);
2875 lttng_event_sync_filter_state(event
);
2876 lttng_event_sync_capture_state(event
);
2881 * lttng_session_sync_event_enablers should be called just before starting a
2885 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2887 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2891 * Apply enablers to session events, adding events to session if need
2892 * be. It is required after each modification applied to an active
2893 * session, and right before session "start".
2894 * "lazy" sync means we only sync if required.
2895 * Should be called with sessions mutex held.
2898 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2900 /* We can skip if session is not active */
2901 if (!session
->active
)
2903 lttng_session_sync_event_enablers(session
);
2907 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2909 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2913 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2915 switch (event_enabler
->enabler_type
) {
2916 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2918 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2919 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2920 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2923 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2925 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2926 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2927 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2936 * Serialize at most one packet worth of metadata into a metadata
2938 * We grab the metadata cache mutex to get exclusive access to our metadata
2939 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2940 * allows us to do racy operations such as looking for remaining space left in
2941 * packet and write, since mutual exclusion protects us from concurrent writes.
2942 * Mutual exclusion on the metadata cache allow us to read the cache content
2943 * without racing against reallocation of the cache by updates.
2944 * Returns the number of bytes written in the channel, 0 if no data
2945 * was written and a negative value on error.
2947 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2948 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2950 struct lttng_kernel_ring_buffer_ctx ctx
;
2952 size_t len
, reserve_len
;
2955 * Ensure we support mutiple get_next / put sequences followed by
2956 * put_next. The metadata cache lock protects reading the metadata
2957 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2958 * "flush" operations on the buffer invoked by different processes.
2959 * Moreover, since the metadata cache memory can be reallocated, we
2960 * need to have exclusive access against updates even though we only
2963 mutex_lock(&stream
->metadata_cache
->lock
);
2964 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2965 if (stream
->metadata_in
!= stream
->metadata_out
)
2968 /* Metadata regenerated, change the version. */
2969 if (stream
->metadata_cache
->version
!= stream
->version
)
2970 stream
->version
= stream
->metadata_cache
->version
;
2972 len
= stream
->metadata_cache
->metadata_written
-
2973 stream
->metadata_in
;
2976 reserve_len
= min_t(size_t,
2977 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2979 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2980 sizeof(char), NULL
);
2982 * If reservation failed, return an error to the caller.
2984 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2986 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2987 stream
->coherent
= false;
2990 stream
->transport
->ops
.event_write(&ctx
,
2991 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2993 stream
->transport
->ops
.event_commit(&ctx
);
2994 stream
->metadata_in
+= reserve_len
;
2995 if (reserve_len
< len
)
2996 stream
->coherent
= false;
2998 stream
->coherent
= true;
3003 *coherent
= stream
->coherent
;
3004 mutex_unlock(&stream
->metadata_cache
->lock
);
3009 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
3011 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
3012 mutex_lock(&session
->priv
->metadata_cache
->lock
);
3016 void lttng_metadata_end(struct lttng_kernel_session
*session
)
3018 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3019 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
3020 struct lttng_metadata_stream
*stream
;
3022 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
3023 wake_up_interruptible(&stream
->read_wait
);
3024 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
3029 * Write the metadata to the metadata cache.
3030 * Must be called with sessions_mutex held.
3031 * The metadata cache lock protects us from concurrent read access from
3032 * thread outputting metadata content to ring buffer.
3033 * The content of the printf is printed as a single atomic metadata
3036 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3037 const char *fmt
, ...)
3043 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3046 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3052 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3053 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3054 session
->priv
->metadata_cache
->cache_alloc
) {
3055 char *tmp_cache_realloc
;
3056 unsigned int tmp_cache_alloc_size
;
3058 tmp_cache_alloc_size
= max_t(unsigned int,
3059 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3060 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3061 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3062 if (!tmp_cache_realloc
)
3064 if (session
->priv
->metadata_cache
->data
) {
3065 memcpy(tmp_cache_realloc
,
3066 session
->priv
->metadata_cache
->data
,
3067 session
->priv
->metadata_cache
->cache_alloc
);
3068 vfree(session
->priv
->metadata_cache
->data
);
3071 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3072 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3074 memcpy(session
->priv
->metadata_cache
->data
+
3075 session
->priv
->metadata_cache
->metadata_written
,
3077 session
->priv
->metadata_cache
->metadata_written
+= len
;
3088 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3092 for (i
= 0; i
< nesting
; i
++) {
3095 ret
= lttng_metadata_printf(session
, " ");
3104 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3105 const struct lttng_kernel_event_field
*field
,
3108 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3112 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3113 const struct lttng_kernel_type_integer
*type
,
3114 enum lttng_kernel_string_encoding parent_encoding
,
3119 ret
= print_tabs(session
, nesting
);
3122 ret
= lttng_metadata_printf(session
,
3123 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3127 (parent_encoding
== lttng_kernel_string_encoding_none
)
3129 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3133 #if __BYTE_ORDER == __BIG_ENDIAN
3134 type
->reverse_byte_order
? " byte_order = le;" : ""
3136 type
->reverse_byte_order
? " byte_order = be;" : ""
3143 * Must be called with sessions_mutex held.
3146 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3147 const struct lttng_kernel_type_struct
*type
,
3150 const char *prev_field_name
= NULL
;
3152 uint32_t i
, nr_fields
;
3153 unsigned int alignment
;
3155 ret
= print_tabs(session
, nesting
);
3158 ret
= lttng_metadata_printf(session
,
3162 nr_fields
= type
->nr_fields
;
3163 for (i
= 0; i
< nr_fields
; i
++) {
3164 const struct lttng_kernel_event_field
*iter_field
;
3166 iter_field
= type
->fields
[i
];
3167 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3171 ret
= print_tabs(session
, nesting
);
3174 alignment
= type
->alignment
;
3176 ret
= lttng_metadata_printf(session
,
3180 ret
= lttng_metadata_printf(session
,
3187 * Must be called with sessions_mutex held.
3190 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3191 const struct lttng_kernel_event_field
*field
,
3196 ret
= _lttng_struct_type_statedump(session
,
3197 lttng_kernel_get_type_struct(field
->type
), nesting
);
3200 return lttng_field_name_statedump(session
, field
, nesting
);
3204 * Must be called with sessions_mutex held.
3207 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3208 const struct lttng_kernel_type_variant
*type
,
3210 const char *prev_field_name
)
3212 const char *tag_name
;
3214 uint32_t i
, nr_choices
;
3216 tag_name
= type
->tag_name
;
3218 tag_name
= prev_field_name
;
3222 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3224 if (type
->alignment
!= 0)
3226 ret
= print_tabs(session
, nesting
);
3229 ret
= lttng_metadata_printf(session
,
3230 "variant <_%s> {\n",
3234 nr_choices
= type
->nr_choices
;
3235 for (i
= 0; i
< nr_choices
; i
++) {
3236 const struct lttng_kernel_event_field
*iter_field
;
3238 iter_field
= type
->choices
[i
];
3239 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3243 ret
= print_tabs(session
, nesting
);
3246 ret
= lttng_metadata_printf(session
,
3252 * Must be called with sessions_mutex held.
3255 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3256 const struct lttng_kernel_event_field
*field
,
3258 const char *prev_field_name
)
3262 ret
= _lttng_variant_type_statedump(session
,
3263 lttng_kernel_get_type_variant(field
->type
), nesting
,
3267 return lttng_field_name_statedump(session
, field
, nesting
);
3271 * Must be called with sessions_mutex held.
3274 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3275 const struct lttng_kernel_event_field
*field
,
3279 const struct lttng_kernel_type_array
*array_type
;
3280 const struct lttng_kernel_type_common
*elem_type
;
3282 array_type
= lttng_kernel_get_type_array(field
->type
);
3283 WARN_ON_ONCE(!array_type
);
3285 if (array_type
->alignment
) {
3286 ret
= print_tabs(session
, nesting
);
3289 ret
= lttng_metadata_printf(session
,
3290 "struct { } align(%u) _%s_padding;\n",
3291 array_type
->alignment
* CHAR_BIT
,
3297 * Nested compound types: Only array of structures and variants are
3298 * currently supported.
3300 elem_type
= array_type
->elem_type
;
3301 switch (elem_type
->type
) {
3302 case lttng_kernel_type_integer
:
3303 case lttng_kernel_type_struct
:
3304 case lttng_kernel_type_variant
:
3305 ret
= _lttng_type_statedump(session
, elem_type
,
3306 array_type
->encoding
, nesting
);
3314 ret
= lttng_metadata_printf(session
,
3317 array_type
->length
);
3322 * Must be called with sessions_mutex held.
3325 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3326 const struct lttng_kernel_event_field
*field
,
3328 const char *prev_field_name
)
3331 const char *length_name
;
3332 const struct lttng_kernel_type_sequence
*sequence_type
;
3333 const struct lttng_kernel_type_common
*elem_type
;
3335 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3336 WARN_ON_ONCE(!sequence_type
);
3338 length_name
= sequence_type
->length_name
;
3340 length_name
= prev_field_name
;
3344 if (sequence_type
->alignment
) {
3345 ret
= print_tabs(session
, nesting
);
3348 ret
= lttng_metadata_printf(session
,
3349 "struct { } align(%u) _%s_padding;\n",
3350 sequence_type
->alignment
* CHAR_BIT
,
3357 * Nested compound types: Only array of structures and variants are
3358 * currently supported.
3360 elem_type
= sequence_type
->elem_type
;
3361 switch (elem_type
->type
) {
3362 case lttng_kernel_type_integer
:
3363 case lttng_kernel_type_struct
:
3364 case lttng_kernel_type_variant
:
3365 ret
= _lttng_type_statedump(session
, elem_type
,
3366 sequence_type
->encoding
, nesting
);
3374 ret
= lttng_metadata_printf(session
,
3382 * Must be called with sessions_mutex held.
3385 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3386 const struct lttng_kernel_type_enum
*type
,
3389 const struct lttng_kernel_enum_desc
*enum_desc
;
3390 const struct lttng_kernel_type_common
*container_type
;
3392 unsigned int i
, nr_entries
;
3394 container_type
= type
->container_type
;
3395 if (container_type
->type
!= lttng_kernel_type_integer
) {
3399 enum_desc
= type
->desc
;
3400 nr_entries
= enum_desc
->nr_entries
;
3402 ret
= print_tabs(session
, nesting
);
3405 ret
= lttng_metadata_printf(session
, "enum : ");
3408 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3409 lttng_kernel_string_encoding_none
, 0);
3412 ret
= lttng_metadata_printf(session
, " {\n");
3415 /* Dump all entries */
3416 for (i
= 0; i
< nr_entries
; i
++) {
3417 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3420 ret
= print_tabs(session
, nesting
+ 1);
3423 ret
= lttng_metadata_printf(session
,
3427 len
= strlen(entry
->string
);
3428 /* Escape the character '"' */
3429 for (j
= 0; j
< len
; j
++) {
3430 char c
= entry
->string
[j
];
3434 ret
= lttng_metadata_printf(session
,
3438 ret
= lttng_metadata_printf(session
,
3442 ret
= lttng_metadata_printf(session
,
3449 ret
= lttng_metadata_printf(session
, "\"");
3453 if (entry
->options
.is_auto
) {
3454 ret
= lttng_metadata_printf(session
, ",\n");
3458 ret
= lttng_metadata_printf(session
,
3462 if (entry
->start
.signedness
)
3463 ret
= lttng_metadata_printf(session
,
3464 "%lld", (long long) entry
->start
.value
);
3466 ret
= lttng_metadata_printf(session
,
3467 "%llu", entry
->start
.value
);
3470 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3472 == entry
->end
.value
) {
3473 ret
= lttng_metadata_printf(session
,
3476 if (entry
->end
.signedness
) {
3477 ret
= lttng_metadata_printf(session
,
3479 (long long) entry
->end
.value
);
3481 ret
= lttng_metadata_printf(session
,
3490 ret
= print_tabs(session
, nesting
);
3493 ret
= lttng_metadata_printf(session
, "}");
3499 * Must be called with sessions_mutex held.
3502 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3503 const struct lttng_kernel_event_field
*field
,
3507 const struct lttng_kernel_type_enum
*enum_type
;
3509 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3510 WARN_ON_ONCE(!enum_type
);
3511 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3514 return lttng_field_name_statedump(session
, field
, nesting
);
3518 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3519 const struct lttng_kernel_event_field
*field
,
3524 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3525 lttng_kernel_string_encoding_none
, nesting
);
3528 return lttng_field_name_statedump(session
, field
, nesting
);
3532 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3533 const struct lttng_kernel_type_string
*type
,
3538 /* Default encoding is UTF8 */
3539 ret
= print_tabs(session
, nesting
);
3542 ret
= lttng_metadata_printf(session
,
3544 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3545 " { encoding = ASCII; }" : "");
3550 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3551 const struct lttng_kernel_event_field
*field
,
3554 const struct lttng_kernel_type_string
*string_type
;
3557 string_type
= lttng_kernel_get_type_string(field
->type
);
3558 WARN_ON_ONCE(!string_type
);
3559 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3562 return lttng_field_name_statedump(session
, field
, nesting
);
3566 * Must be called with sessions_mutex held.
3569 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3570 const struct lttng_kernel_type_common
*type
,
3571 enum lttng_kernel_string_encoding parent_encoding
,
3576 switch (type
->type
) {
3577 case lttng_kernel_type_integer
:
3578 ret
= _lttng_integer_type_statedump(session
,
3579 lttng_kernel_get_type_integer(type
),
3580 parent_encoding
, nesting
);
3582 case lttng_kernel_type_enum
:
3583 ret
= _lttng_enum_type_statedump(session
,
3584 lttng_kernel_get_type_enum(type
),
3587 case lttng_kernel_type_string
:
3588 ret
= _lttng_string_type_statedump(session
,
3589 lttng_kernel_get_type_string(type
),
3592 case lttng_kernel_type_struct
:
3593 ret
= _lttng_struct_type_statedump(session
,
3594 lttng_kernel_get_type_struct(type
),
3597 case lttng_kernel_type_variant
:
3598 ret
= _lttng_variant_type_statedump(session
,
3599 lttng_kernel_get_type_variant(type
),
3603 /* Nested arrays and sequences are not supported yet. */
3604 case lttng_kernel_type_array
:
3605 case lttng_kernel_type_sequence
:
3614 * Must be called with sessions_mutex held.
3617 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3618 const struct lttng_kernel_event_field
*field
,
3620 const char **prev_field_name_p
)
3622 const char *prev_field_name
= NULL
;
3625 if (prev_field_name_p
)
3626 prev_field_name
= *prev_field_name_p
;
3627 switch (field
->type
->type
) {
3628 case lttng_kernel_type_integer
:
3629 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3631 case lttng_kernel_type_enum
:
3632 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3634 case lttng_kernel_type_string
:
3635 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3637 case lttng_kernel_type_struct
:
3638 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3640 case lttng_kernel_type_array
:
3641 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3643 case lttng_kernel_type_sequence
:
3644 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3646 case lttng_kernel_type_variant
:
3647 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3654 if (prev_field_name_p
)
3655 *prev_field_name_p
= field
->name
;
3660 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3661 struct lttng_kernel_ctx
*ctx
)
3663 const char *prev_field_name
= NULL
;
3669 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3670 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3672 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3680 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3681 struct lttng_kernel_event_recorder
*event_recorder
)
3683 const char *prev_field_name
= NULL
;
3684 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3688 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3689 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3691 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3699 * Must be called with sessions_mutex held.
3700 * The entire event metadata is printed as a single atomic metadata
3704 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3706 struct lttng_kernel_event_recorder
*event_recorder
;
3707 struct lttng_kernel_channel_buffer
*chan
;
3708 struct lttng_kernel_session
*session
;
3711 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3713 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3714 chan
= event_recorder
->chan
;
3715 session
= chan
->parent
.session
;
3717 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3719 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3722 lttng_metadata_begin(session
);
3724 ret
= lttng_metadata_printf(session
,
3728 " stream_id = %u;\n",
3729 event_recorder
->priv
->parent
.desc
->event_name
,
3730 event_recorder
->priv
->id
,
3731 event_recorder
->chan
->priv
->id
);
3735 ret
= lttng_metadata_printf(session
,
3736 " fields := struct {\n"
3741 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3746 * LTTng space reservation can only reserve multiples of the
3749 ret
= lttng_metadata_printf(session
,
3755 event_recorder
->priv
->metadata_dumped
= 1;
3757 lttng_metadata_end(session
);
3763 * Must be called with sessions_mutex held.
3764 * The entire channel metadata is printed as a single atomic metadata
3768 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3769 struct lttng_kernel_channel_buffer
*chan
)
3773 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3776 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3779 lttng_metadata_begin(session
);
3781 WARN_ON_ONCE(!chan
->priv
->header_type
);
3782 ret
= lttng_metadata_printf(session
,
3785 " event.header := %s;\n"
3786 " packet.context := struct packet_context;\n",
3788 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3789 "struct event_header_large");
3793 if (chan
->priv
->ctx
) {
3794 ret
= lttng_metadata_printf(session
,
3795 " event.context := struct {\n");
3799 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3802 if (chan
->priv
->ctx
) {
3803 ret
= lttng_metadata_printf(session
,
3809 ret
= lttng_metadata_printf(session
,
3812 chan
->priv
->metadata_dumped
= 1;
3814 lttng_metadata_end(session
);
3819 * Must be called with sessions_mutex held.
3822 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3824 return lttng_metadata_printf(session
,
3825 "struct packet_context {\n"
3826 " uint64_clock_monotonic_t timestamp_begin;\n"
3827 " uint64_clock_monotonic_t timestamp_end;\n"
3828 " uint64_t content_size;\n"
3829 " uint64_t packet_size;\n"
3830 " uint64_t packet_seq_num;\n"
3831 " unsigned long events_discarded;\n"
3832 " uint32_t cpu_id;\n"
3839 * id: range: 0 - 30.
3840 * id 31 is reserved to indicate an extended header.
3843 * id: range: 0 - 65534.
3844 * id 65535 is reserved to indicate an extended header.
3846 * Must be called with sessions_mutex held.
3849 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3851 return lttng_metadata_printf(session
,
3852 "struct event_header_compact {\n"
3853 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3856 " uint27_clock_monotonic_t timestamp;\n"
3860 " uint64_clock_monotonic_t timestamp;\n"
3865 "struct event_header_large {\n"
3866 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3869 " uint32_clock_monotonic_t timestamp;\n"
3873 " uint64_clock_monotonic_t timestamp;\n"
3877 lttng_alignof(uint32_t) * CHAR_BIT
,
3878 lttng_alignof(uint16_t) * CHAR_BIT
3883 * Approximation of NTP time of day to clock monotonic correlation,
3884 * taken at start of trace.
3885 * Yes, this is only an approximation. Yes, we can (and will) do better
3886 * in future versions.
3887 * This function may return a negative offset. It may happen if the
3888 * system sets the REALTIME clock to 0 after boot.
3890 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3894 int64_t measure_clock_offset(void)
3896 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3897 uint64_t tcf
= trace_clock_freq();
3899 unsigned long flags
;
3900 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3901 struct timespec64 rts
= { 0, 0 };
3903 struct timespec rts
= { 0, 0 };
3906 /* Disable interrupts to increase correlation precision. */
3907 local_irq_save(flags
);
3908 monotonic
[0] = trace_clock_read64();
3909 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3910 ktime_get_real_ts64(&rts
);
3912 getnstimeofday(&rts
);
3914 monotonic
[1] = trace_clock_read64();
3915 local_irq_restore(flags
);
3917 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3918 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3919 if (tcf
== NSEC_PER_SEC
) {
3920 realtime
+= rts
.tv_nsec
;
3922 uint64_t n
= rts
.tv_nsec
* tcf
;
3924 do_div(n
, NSEC_PER_SEC
);
3927 offset
= (int64_t) realtime
- monotonic_avg
;
3932 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3940 while (cur
!= '\0') {
3943 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3947 ret
= lttng_metadata_printf(session
, "%c", '\\');
3950 /* We still print the current char */
3953 ret
= lttng_metadata_printf(session
, "%c", cur
);
3967 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3968 const char *field_value
)
3972 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3976 ret
= print_escaped_ctf_string(session
, field_value
);
3980 ret
= lttng_metadata_printf(session
, "\";\n");
3987 * Output metadata into this session's metadata buffers.
3988 * Must be called with sessions_mutex held.
3991 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3993 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3994 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3995 const char *product_uuid
;
3996 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3997 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
4000 if (!LTTNG_READ_ONCE(session
->active
))
4003 lttng_metadata_begin(session
);
4005 if (session
->priv
->metadata_dumped
)
4008 snprintf(uuid_s
, sizeof(uuid_s
),
4009 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
4010 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
4011 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
4012 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
4013 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
4015 ret
= lttng_metadata_printf(session
,
4016 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4017 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4018 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4019 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4020 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4021 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4022 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4028 " byte_order = %s;\n"
4029 " packet.header := struct {\n"
4030 " uint32_t magic;\n"
4031 " uint8_t uuid[16];\n"
4032 " uint32_t stream_id;\n"
4033 " uint64_t stream_instance_id;\n"
4036 lttng_alignof(uint8_t) * CHAR_BIT
,
4037 lttng_alignof(uint16_t) * CHAR_BIT
,
4038 lttng_alignof(uint32_t) * CHAR_BIT
,
4039 lttng_alignof(uint64_t) * CHAR_BIT
,
4040 sizeof(unsigned long) * CHAR_BIT
,
4041 lttng_alignof(unsigned long) * CHAR_BIT
,
4045 #if __BYTE_ORDER == __BIG_ENDIAN
4054 ret
= lttng_metadata_printf(session
,
4056 " hostname = \"%s\";\n"
4057 " domain = \"kernel\";\n"
4058 " sysname = \"%s\";\n"
4059 " kernel_release = \"%s\";\n"
4060 " kernel_version = \"%s\";\n"
4061 " tracer_name = \"lttng-modules\";\n"
4062 " tracer_major = %d;\n"
4063 " tracer_minor = %d;\n"
4064 " tracer_patchlevel = %d;\n"
4065 " trace_buffering_scheme = \"global\";\n",
4066 current
->nsproxy
->uts_ns
->name
.nodename
,
4070 LTTNG_MODULES_MAJOR_VERSION
,
4071 LTTNG_MODULES_MINOR_VERSION
,
4072 LTTNG_MODULES_PATCHLEVEL_VERSION
4077 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4080 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4081 session
->priv
->creation_time
);
4085 /* Add the product UUID to the 'env' section */
4086 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4088 ret
= lttng_metadata_printf(session
,
4089 " product_uuid = \"%s\";\n",
4096 /* Close the 'env' section */
4097 ret
= lttng_metadata_printf(session
, "};\n\n");
4101 ret
= lttng_metadata_printf(session
,
4103 " name = \"%s\";\n",
4109 if (!trace_clock_uuid(clock_uuid_s
)) {
4110 ret
= lttng_metadata_printf(session
,
4111 " uuid = \"%s\";\n",
4118 ret
= lttng_metadata_printf(session
,
4119 " description = \"%s\";\n"
4120 " freq = %llu; /* Frequency, in Hz */\n"
4121 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4124 trace_clock_description(),
4125 (unsigned long long) trace_clock_freq(),
4126 (long long) measure_clock_offset()
4131 ret
= lttng_metadata_printf(session
,
4132 "typealias integer {\n"
4133 " size = 27; align = 1; signed = false;\n"
4134 " map = clock.%s.value;\n"
4135 "} := uint27_clock_monotonic_t;\n"
4137 "typealias integer {\n"
4138 " size = 32; align = %u; signed = false;\n"
4139 " map = clock.%s.value;\n"
4140 "} := uint32_clock_monotonic_t;\n"
4142 "typealias integer {\n"
4143 " size = 64; align = %u; signed = false;\n"
4144 " map = clock.%s.value;\n"
4145 "} := uint64_clock_monotonic_t;\n\n",
4147 lttng_alignof(uint32_t) * CHAR_BIT
,
4149 lttng_alignof(uint64_t) * CHAR_BIT
,
4155 ret
= _lttng_stream_packet_context_declare(session
);
4159 ret
= _lttng_event_header_declare(session
);
4164 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4165 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4170 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4171 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
4175 session
->priv
->metadata_dumped
= 1;
4177 lttng_metadata_end(session
);
4182 * lttng_transport_register - LTT transport registration
4183 * @transport: transport structure
4185 * Registers a transport which can be used as output to extract the data out of
4186 * LTTng. The module calling this registration function must ensure that no
4187 * trap-inducing code will be executed by the transport functions. E.g.
4188 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4189 * is made visible to the transport function. This registration acts as a
4190 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4191 * after its registration must it synchronize the TLBs.
4193 void lttng_transport_register(struct lttng_transport
*transport
)
4196 * Make sure no page fault can be triggered by the module about to be
4197 * registered. We deal with this here so we don't have to call
4198 * vmalloc_sync_mappings() in each module's init.
4200 wrapper_vmalloc_sync_mappings();
4202 mutex_lock(&sessions_mutex
);
4203 list_add_tail(&transport
->node
, <tng_transport_list
);
4204 mutex_unlock(&sessions_mutex
);
4206 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4209 * lttng_transport_unregister - LTT transport unregistration
4210 * @transport: transport structure
4212 void lttng_transport_unregister(struct lttng_transport
*transport
)
4214 mutex_lock(&sessions_mutex
);
4215 list_del(&transport
->node
);
4216 mutex_unlock(&sessions_mutex
);
4218 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4220 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4223 * Make sure no page fault can be triggered by the module about to be
4224 * registered. We deal with this here so we don't have to call
4225 * vmalloc_sync_mappings() in each module's init.
4227 wrapper_vmalloc_sync_mappings();
4229 mutex_lock(&sessions_mutex
);
4230 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4231 mutex_unlock(&sessions_mutex
);
4233 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4235 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4237 mutex_lock(&sessions_mutex
);
4238 list_del(&transport
->node
);
4239 mutex_unlock(&sessions_mutex
);
4241 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4243 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4245 enum cpuhp_state lttng_hp_prepare
;
4246 enum cpuhp_state lttng_hp_online
;
4248 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4250 struct lttng_cpuhp_node
*lttng_node
;
4252 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4253 switch (lttng_node
->component
) {
4254 case LTTNG_RING_BUFFER_FRONTEND
:
4256 case LTTNG_RING_BUFFER_BACKEND
:
4257 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4258 case LTTNG_RING_BUFFER_ITER
:
4260 case LTTNG_CONTEXT_PERF_COUNTERS
:
4267 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4269 struct lttng_cpuhp_node
*lttng_node
;
4271 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4272 switch (lttng_node
->component
) {
4273 case LTTNG_RING_BUFFER_FRONTEND
:
4274 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4275 case LTTNG_RING_BUFFER_BACKEND
:
4277 case LTTNG_RING_BUFFER_ITER
:
4279 case LTTNG_CONTEXT_PERF_COUNTERS
:
4280 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4286 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4288 struct lttng_cpuhp_node
*lttng_node
;
4290 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4291 switch (lttng_node
->component
) {
4292 case LTTNG_RING_BUFFER_FRONTEND
:
4293 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4294 case LTTNG_RING_BUFFER_BACKEND
:
4296 case LTTNG_RING_BUFFER_ITER
:
4297 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4298 case LTTNG_CONTEXT_PERF_COUNTERS
:
4299 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4305 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4307 struct lttng_cpuhp_node
*lttng_node
;
4309 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4310 switch (lttng_node
->component
) {
4311 case LTTNG_RING_BUFFER_FRONTEND
:
4312 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4313 case LTTNG_RING_BUFFER_BACKEND
:
4315 case LTTNG_RING_BUFFER_ITER
:
4317 case LTTNG_CONTEXT_PERF_COUNTERS
:
4324 static int __init
lttng_init_cpu_hotplug(void)
4328 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4329 lttng_hotplug_prepare
,
4330 lttng_hotplug_dead
);
4334 lttng_hp_prepare
= ret
;
4335 lttng_rb_set_hp_prepare(ret
);
4337 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4338 lttng_hotplug_online
,
4339 lttng_hotplug_offline
);
4341 cpuhp_remove_multi_state(lttng_hp_prepare
);
4342 lttng_hp_prepare
= 0;
4345 lttng_hp_online
= ret
;
4346 lttng_rb_set_hp_online(ret
);
4351 static void __exit
lttng_exit_cpu_hotplug(void)
4353 lttng_rb_set_hp_online(0);
4354 cpuhp_remove_multi_state(lttng_hp_online
);
4355 lttng_rb_set_hp_prepare(0);
4356 cpuhp_remove_multi_state(lttng_hp_prepare
);
4359 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4360 static int lttng_init_cpu_hotplug(void)
4364 static void lttng_exit_cpu_hotplug(void)
4367 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4369 static int __init
lttng_events_init(void)
4373 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4376 ret
= wrapper_get_pfnblock_flags_mask_init();
4379 ret
= wrapper_get_pageblock_flags_mask_init();
4382 ret
= lttng_probes_init();
4385 ret
= lttng_context_init();
4388 ret
= lttng_tracepoint_init();
4391 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4392 if (!event_recorder_cache
) {
4394 goto error_kmem_event_recorder
;
4396 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4397 if (!event_recorder_private_cache
) {
4399 goto error_kmem_event_recorder_private
;
4401 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4402 if (!event_notifier_cache
) {
4404 goto error_kmem_event_notifier
;
4406 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4407 if (!event_notifier_private_cache
) {
4409 goto error_kmem_event_notifier_private
;
4411 ret
= lttng_abi_init();
4414 ret
= lttng_logger_init();
4417 ret
= lttng_init_cpu_hotplug();
4420 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4421 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4422 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4423 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4424 LTTNG_MODULES_EXTRAVERSION
,
4426 #ifdef LTTNG_EXTRA_VERSION_GIT
4427 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4431 #ifdef LTTNG_EXTRA_VERSION_NAME
4432 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4436 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4437 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4438 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4442 lttng_logger_exit();
4446 kmem_cache_destroy(event_notifier_private_cache
);
4447 error_kmem_event_notifier_private
:
4448 kmem_cache_destroy(event_notifier_cache
);
4449 error_kmem_event_notifier
:
4450 kmem_cache_destroy(event_recorder_private_cache
);
4451 error_kmem_event_recorder_private
:
4452 kmem_cache_destroy(event_recorder_cache
);
4453 error_kmem_event_recorder
:
4454 lttng_tracepoint_exit();
4456 lttng_context_exit();
4457 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4458 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4459 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4460 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4461 LTTNG_MODULES_EXTRAVERSION
,
4463 #ifdef LTTNG_EXTRA_VERSION_GIT
4464 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4468 #ifdef LTTNG_EXTRA_VERSION_NAME
4469 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4476 module_init(lttng_events_init
);
4478 static void __exit
lttng_events_exit(void)
4480 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4482 lttng_exit_cpu_hotplug();
4483 lttng_logger_exit();
4485 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4486 lttng_session_destroy(session_priv
->pub
);
4487 kmem_cache_destroy(event_recorder_cache
);
4488 kmem_cache_destroy(event_recorder_private_cache
);
4489 kmem_cache_destroy(event_notifier_cache
);
4490 kmem_cache_destroy(event_notifier_private_cache
);
4491 lttng_tracepoint_exit();
4492 lttng_context_exit();
4493 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4494 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4495 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4496 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4497 LTTNG_MODULES_EXTRAVERSION
,
4499 #ifdef LTTNG_EXTRA_VERSION_GIT
4500 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4504 #ifdef LTTNG_EXTRA_VERSION_NAME
4505 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4511 module_exit(lttng_events_exit
);
4513 #include <generated/patches.h>
4514 #ifdef LTTNG_EXTRA_VERSION_GIT
4515 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4517 #ifdef LTTNG_EXTRA_VERSION_NAME
4518 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4520 MODULE_LICENSE("GPL and additional rights");
4521 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4522 MODULE_DESCRIPTION("LTTng tracer");
4523 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4524 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4525 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4526 LTTNG_MODULES_EXTRAVERSION
);