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.
1064 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1065 const struct lttng_kernel_event_desc
*event_desc
)
1067 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
1068 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
1069 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
1070 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1071 struct lttng_kernel_event_common_private
*event_priv
;
1072 struct lttng_kernel_event_common
*event
;
1073 const char *event_name
;
1074 struct hlist_head
*head
;
1077 if (!lttng_kernel_event_id_available(event_enabler
)) {
1083 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1084 event_name
= event_desc
->event_name
;
1087 case LTTNG_KERNEL_ABI_KPROBE
:
1089 case LTTNG_KERNEL_ABI_UPROBE
:
1091 case LTTNG_KERNEL_ABI_KRETPROBE
:
1093 case LTTNG_KERNEL_ABI_SYSCALL
:
1094 event_name
= event_param
->name
;
1097 case LTTNG_KERNEL_ABI_FUNCTION
:
1099 case LTTNG_KERNEL_ABI_NOOP
:
1107 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1108 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1109 if (lttng_event_enabler_event_name_match_event(event_enabler
, event_name
, event_priv
->pub
)) {
1115 event
= lttng_kernel_event_alloc(event_enabler
);
1122 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1123 /* Event will be enabled by enabler sync. */
1125 event
->priv
->registered
= 0;
1126 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1127 if (!event
->priv
->desc
) {
1129 goto register_error
;
1131 /* Populate lttng_event structure before event registration. */
1135 case LTTNG_KERNEL_ABI_KPROBE
:
1137 * Needs to be explicitly enabled after creation, since
1138 * we may want to apply filters.
1141 event
->priv
->registered
= 1;
1143 * Populate lttng_event structure before event
1147 ret
= lttng_kprobes_register_event(event_name
,
1148 event_param
->u
.kprobe
.symbol_name
,
1149 event_param
->u
.kprobe
.offset
,
1150 event_param
->u
.kprobe
.addr
,
1154 goto register_error
;
1156 ret
= try_module_get(event
->priv
->desc
->owner
);
1160 case LTTNG_KERNEL_ABI_KRETPROBE
:
1162 struct lttng_kernel_event_common
*event_return
;
1164 /* kretprobe defines 2 events */
1166 * Needs to be explicitly enabled after creation, since
1167 * we may want to apply filters.
1170 event
->priv
->registered
= 1;
1172 event_return
= lttng_kernel_event_alloc(event_enabler
);
1178 event_return
->enabled
= 0;
1179 event_return
->priv
->registered
= 1;
1182 * Populate lttng_event structure before kretprobe registration.
1185 ret
= lttng_kretprobes_register(event_name
,
1186 event_param
->u
.kretprobe
.symbol_name
,
1187 event_param
->u
.kretprobe
.offset
,
1188 event_param
->u
.kretprobe
.addr
,
1189 event
, event_return
);
1191 lttng_kernel_event_free(event_return
);
1193 goto register_error
;
1195 /* Take 2 refs on the module: one per event. */
1196 ret
= try_module_get(event
->priv
->desc
->owner
);
1198 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1200 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1201 WARN_ON_ONCE(ret
> 0);
1203 lttng_kernel_event_free(event_return
);
1204 module_put(event_return
->priv
->desc
->owner
);
1205 module_put(event
->priv
->desc
->owner
);
1206 goto statedump_error
;
1208 list_add(&event_return
->priv
->node
, event_list_head
);
1212 case LTTNG_KERNEL_ABI_SYSCALL
:
1214 * Needs to be explicitly enabled after creation, since
1215 * we may want to apply filters.
1218 event
->priv
->registered
= 0;
1219 event
->priv
->desc
= event_desc
;
1220 switch (event_param
->u
.syscall
.entryexit
) {
1221 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1223 goto register_error
;
1224 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1225 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1227 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1228 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1231 switch (event_param
->u
.syscall
.abi
) {
1232 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1234 goto register_error
;
1235 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1236 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1238 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1239 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1242 if (!event
->priv
->desc
) {
1244 goto register_error
;
1248 case LTTNG_KERNEL_ABI_UPROBE
:
1250 * Needs to be explicitly enabled after creation, since
1251 * we may want to apply filters.
1254 event
->priv
->registered
= 1;
1257 * Populate lttng_event structure before event
1262 ret
= lttng_uprobes_register_event(event_param
->name
,
1263 event_param
->u
.uprobe
.fd
,
1266 goto register_error
;
1267 ret
= try_module_get(event
->priv
->desc
->owner
);
1271 case LTTNG_KERNEL_ABI_FUNCTION
:
1273 case LTTNG_KERNEL_ABI_NOOP
:
1278 goto register_error
;
1281 ret
= _lttng_event_recorder_metadata_statedump(event
);
1282 WARN_ON_ONCE(ret
> 0);
1284 goto statedump_error
;
1287 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1289 goto register_error
;
1291 hlist_add_head(&event
->priv
->hlist_node
, head
);
1292 list_add(&event
->priv
->node
, event_list_head
);
1297 /* If a statedump error occurs, events will not be readable. */
1299 lttng_kernel_event_free(event
);
1304 return ERR_PTR(ret
);
1307 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1308 const struct lttng_kernel_event_desc
*event_desc
)
1310 struct lttng_kernel_event_common
*event
;
1312 mutex_lock(&sessions_mutex
);
1313 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1314 mutex_unlock(&sessions_mutex
);
1318 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1319 const size_t *dim_indexes
, int32_t cpu
,
1320 int64_t *val
, bool *overflow
, bool *underflow
)
1322 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1323 cpu
, val
, overflow
, underflow
);
1326 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1327 const size_t *dim_indexes
, int64_t *val
,
1328 bool *overflow
, bool *underflow
)
1330 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1331 val
, overflow
, underflow
);
1334 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1335 const size_t *dim_indexes
)
1337 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1340 /* Only used for tracepoints for now. */
1342 void register_event(struct lttng_kernel_event_common
*event
)
1344 const struct lttng_kernel_event_desc
*desc
;
1347 if (event
->priv
->registered
)
1350 desc
= event
->priv
->desc
;
1351 switch (event
->priv
->instrumentation
) {
1352 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1353 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1354 desc
->tp_class
->probe_callback
,
1358 case LTTNG_KERNEL_ABI_SYSCALL
:
1359 ret
= lttng_syscall_filter_enable_event(event
);
1362 case LTTNG_KERNEL_ABI_KPROBE
:
1364 case LTTNG_KERNEL_ABI_UPROBE
:
1368 case LTTNG_KERNEL_ABI_KRETPROBE
:
1369 switch (event
->type
) {
1370 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1373 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1379 case LTTNG_KERNEL_ABI_FUNCTION
:
1381 case LTTNG_KERNEL_ABI_NOOP
:
1387 event
->priv
->registered
= 1;
1390 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1392 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1393 const struct lttng_kernel_event_desc
*desc
;
1396 if (!event_priv
->registered
)
1399 desc
= event_priv
->desc
;
1400 switch (event_priv
->instrumentation
) {
1401 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1402 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1403 event_priv
->desc
->tp_class
->probe_callback
,
1407 case LTTNG_KERNEL_ABI_KPROBE
:
1408 lttng_kprobes_unregister_event(event
);
1412 case LTTNG_KERNEL_ABI_KRETPROBE
:
1413 switch (event
->type
) {
1414 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1415 lttng_kretprobes_unregister(event
);
1418 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1424 case LTTNG_KERNEL_ABI_SYSCALL
:
1425 ret
= lttng_syscall_filter_disable_event(event
);
1428 case LTTNG_KERNEL_ABI_NOOP
:
1429 switch (event
->type
) {
1430 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1433 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1439 case LTTNG_KERNEL_ABI_UPROBE
:
1440 lttng_uprobes_unregister_event(event
);
1444 case LTTNG_KERNEL_ABI_FUNCTION
:
1450 event_priv
->registered
= 0;
1455 * Only used internally at session destruction.
1458 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1460 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1461 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1463 lttng_free_event_filter_runtime(event
);
1464 /* Free event enabler refs */
1465 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1466 &event_priv
->enablers_ref_head
, node
)
1469 switch (event
->type
) {
1470 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1472 struct lttng_kernel_event_recorder
*event_recorder
=
1473 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1475 switch (event_priv
->instrumentation
) {
1476 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1477 lttng_event_desc_put(event_priv
->desc
);
1480 case LTTNG_KERNEL_ABI_KPROBE
:
1481 module_put(event_priv
->desc
->owner
);
1482 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1485 case LTTNG_KERNEL_ABI_KRETPROBE
:
1486 module_put(event_priv
->desc
->owner
);
1487 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1490 case LTTNG_KERNEL_ABI_SYSCALL
:
1493 case LTTNG_KERNEL_ABI_UPROBE
:
1494 module_put(event_priv
->desc
->owner
);
1495 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1498 case LTTNG_KERNEL_ABI_FUNCTION
:
1500 case LTTNG_KERNEL_ABI_NOOP
:
1505 list_del(&event_recorder
->priv
->parent
.node
);
1506 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1507 kmem_cache_free(event_recorder_cache
, event_recorder
);
1510 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1512 struct lttng_kernel_event_notifier
*event_notifier
=
1513 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1515 switch (event_notifier
->priv
->parent
.instrumentation
) {
1516 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1517 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1520 case LTTNG_KERNEL_ABI_KPROBE
:
1521 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1522 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1525 case LTTNG_KERNEL_ABI_SYSCALL
:
1528 case LTTNG_KERNEL_ABI_UPROBE
:
1529 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1530 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1533 case LTTNG_KERNEL_ABI_KRETPROBE
:
1535 case LTTNG_KERNEL_ABI_FUNCTION
:
1537 case LTTNG_KERNEL_ABI_NOOP
:
1542 list_del(&event_notifier
->priv
->parent
.node
);
1543 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1544 kmem_cache_free(event_notifier_cache
, event_notifier
);
1552 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1553 enum tracker_type tracker_type
)
1555 switch (tracker_type
) {
1557 return &session
->pid_tracker
;
1559 return &session
->vpid_tracker
;
1561 return &session
->uid_tracker
;
1563 return &session
->vuid_tracker
;
1565 return &session
->gid_tracker
;
1567 return &session
->vgid_tracker
;
1574 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1575 enum tracker_type tracker_type
, int id
)
1577 struct lttng_kernel_id_tracker
*tracker
;
1580 tracker
= get_tracker(session
, tracker_type
);
1585 mutex_lock(&sessions_mutex
);
1587 /* track all ids: destroy tracker. */
1588 lttng_id_tracker_destroy(tracker
, true);
1591 ret
= lttng_id_tracker_add(tracker
, id
);
1593 mutex_unlock(&sessions_mutex
);
1597 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1598 enum tracker_type tracker_type
, int id
)
1600 struct lttng_kernel_id_tracker
*tracker
;
1603 tracker
= get_tracker(session
, tracker_type
);
1608 mutex_lock(&sessions_mutex
);
1610 /* untrack all ids: replace by empty tracker. */
1611 ret
= lttng_id_tracker_empty_set(tracker
);
1613 ret
= lttng_id_tracker_del(tracker
, id
);
1615 mutex_unlock(&sessions_mutex
);
1620 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1622 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1623 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1624 struct lttng_id_hash_node
*e
;
1627 mutex_lock(&sessions_mutex
);
1629 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1630 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1632 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1638 /* ID tracker disabled. */
1639 if (iter
>= *pos
&& iter
== 0) {
1640 return id_tracker_p
; /* empty tracker */
1648 /* Called with sessions_mutex held. */
1650 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1652 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1653 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1654 struct lttng_id_hash_node
*e
;
1659 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1660 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1662 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1663 if (iter
++ >= *ppos
)
1668 /* ID tracker disabled. */
1669 if (iter
>= *ppos
&& iter
== 0)
1670 return p
; /* empty tracker */
1679 void id_list_stop(struct seq_file
*m
, void *p
)
1681 mutex_unlock(&sessions_mutex
);
1685 int id_list_show(struct seq_file
*m
, void *p
)
1687 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1688 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1691 if (p
== id_tracker_p
) {
1692 /* Tracker disabled. */
1695 const struct lttng_id_hash_node
*e
= p
;
1697 id
= lttng_id_tracker_get_node_id(e
);
1699 switch (id_tracker
->priv
->tracker_type
) {
1701 seq_printf(m
, "process { pid = %d; };\n", id
);
1704 seq_printf(m
, "process { vpid = %d; };\n", id
);
1707 seq_printf(m
, "user { uid = %d; };\n", id
);
1710 seq_printf(m
, "user { vuid = %d; };\n", id
);
1713 seq_printf(m
, "group { gid = %d; };\n", id
);
1716 seq_printf(m
, "group { vgid = %d; };\n", id
);
1719 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1725 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1726 .start
= id_list_start
,
1727 .next
= id_list_next
,
1728 .stop
= id_list_stop
,
1729 .show
= id_list_show
,
1733 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1735 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1739 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1741 struct seq_file
*m
= file
->private_data
;
1742 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1745 WARN_ON_ONCE(!id_tracker
);
1746 ret
= seq_release(inode
, file
);
1748 fput(id_tracker
->priv
->session
->priv
->file
);
1752 const struct file_operations lttng_tracker_ids_list_fops
= {
1753 .owner
= THIS_MODULE
,
1754 .open
= lttng_tracker_ids_list_open
,
1756 .llseek
= seq_lseek
,
1757 .release
= lttng_tracker_ids_list_release
,
1760 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1761 enum tracker_type tracker_type
)
1763 struct file
*tracker_ids_list_file
;
1767 file_fd
= lttng_get_unused_fd();
1773 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1774 <tng_tracker_ids_list_fops
,
1776 if (IS_ERR(tracker_ids_list_file
)) {
1777 ret
= PTR_ERR(tracker_ids_list_file
);
1780 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1782 goto refcount_error
;
1784 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1787 m
= tracker_ids_list_file
->private_data
;
1789 m
->private = get_tracker(session
, tracker_type
);
1790 BUG_ON(!m
->private);
1791 fd_install(file_fd
, tracker_ids_list_file
);
1796 atomic_long_dec(&session
->priv
->file
->f_count
);
1798 fput(tracker_ids_list_file
);
1800 put_unused_fd(file_fd
);
1806 * Enabler management.
1809 int lttng_match_enabler_star_glob(const char *desc_name
,
1810 const char *pattern
)
1812 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1813 desc_name
, LTTNG_SIZE_MAX
))
1819 int lttng_match_enabler_name(const char *desc_name
,
1822 if (strcmp(desc_name
, name
))
1828 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1829 struct lttng_event_enabler_common
*enabler
)
1831 const char *desc_name
, *enabler_name
;
1832 bool compat
= false, entry
= false;
1834 enabler_name
= enabler
->event_param
.name
;
1835 switch (enabler
->event_param
.instrumentation
) {
1836 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1837 desc_name
= desc
->event_name
;
1838 switch (enabler
->format_type
) {
1839 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1840 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1841 case LTTNG_ENABLER_FORMAT_NAME
:
1842 return lttng_match_enabler_name(desc_name
, enabler_name
);
1848 case LTTNG_KERNEL_ABI_SYSCALL
:
1849 desc_name
= desc
->event_name
;
1850 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1851 desc_name
+= strlen("compat_");
1854 if (!strncmp(desc_name
, "syscall_exit_",
1855 strlen("syscall_exit_"))) {
1856 desc_name
+= strlen("syscall_exit_");
1857 } else if (!strncmp(desc_name
, "syscall_entry_",
1858 strlen("syscall_entry_"))) {
1859 desc_name
+= strlen("syscall_entry_");
1865 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1866 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1868 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1872 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1879 switch (enabler
->event_param
.u
.syscall
.abi
) {
1880 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1882 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1886 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1893 switch (enabler
->event_param
.u
.syscall
.match
) {
1894 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1895 switch (enabler
->format_type
) {
1896 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1897 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1898 case LTTNG_ENABLER_FORMAT_NAME
:
1899 return lttng_match_enabler_name(desc_name
, enabler_name
);
1904 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1905 return -EINVAL
; /* Not implemented. */
1917 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1918 struct lttng_event_enabler_common
*enabler
)
1922 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
1930 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
1931 struct lttng_kernel_event_common
*event
)
1933 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1936 switch (event_enabler
->enabler_type
) {
1937 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1939 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1940 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1941 struct lttng_kernel_event_recorder
*event_recorder
=
1942 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1944 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1945 && event_recorder
->chan
== event_recorder_enabler
->chan
)
1950 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1952 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1953 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1954 struct lttng_kernel_event_notifier
*event_notifier
=
1955 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1957 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1958 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1959 && event
->priv
->user_token
== event_enabler
->user_token
)
1970 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
1971 const struct lttng_kernel_event_desc
*desc
,
1972 struct lttng_kernel_event_common
*event
)
1974 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1977 switch (event_enabler
->enabler_type
) {
1978 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1980 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1981 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1982 struct lttng_kernel_event_recorder
*event_recorder
=
1983 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1985 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
1990 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1992 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1993 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1994 struct lttng_kernel_event_notifier
*event_notifier
=
1995 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1997 if (event
->priv
->desc
== desc
1998 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1999 && event
->priv
->user_token
== event_enabler
->user_token
)
2010 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2011 const char *event_name
,
2012 struct lttng_kernel_event_common
*event
)
2014 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2017 switch (event_enabler
->enabler_type
) {
2018 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2020 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2021 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2022 struct lttng_kernel_event_recorder
*event_recorder
=
2023 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2025 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2026 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2031 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2033 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2034 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2035 struct lttng_kernel_event_notifier
*event_notifier
=
2036 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2038 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2039 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2040 && event
->priv
->user_token
== event_enabler
->user_token
)
2052 struct lttng_enabler_ref
*lttng_enabler_ref(
2053 struct list_head
*enablers_ref_list
,
2054 struct lttng_event_enabler_common
*enabler
)
2056 struct lttng_enabler_ref
*enabler_ref
;
2058 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2059 if (enabler_ref
->ref
== enabler
)
2066 void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2068 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2069 struct lttng_kernel_probe_desc
*probe_desc
;
2070 const struct lttng_kernel_event_desc
*desc
;
2071 struct list_head
*probe_list
;
2074 probe_list
= lttng_get_probe_list_head();
2076 * For each probe event, if we find that a probe event matches
2077 * our enabler, create an associated lttng_event if not
2080 list_for_each_entry(probe_desc
, probe_list
, head
) {
2081 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2083 struct hlist_head
*head
;
2084 struct lttng_kernel_event_common
*event
;
2085 struct lttng_kernel_event_common_private
*event_priv
;
2087 desc
= probe_desc
->event_desc
[i
];
2088 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2092 * Check if already created.
2094 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2095 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2096 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
)) {
2105 * We need to create an event for this event probe.
2107 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2108 if (IS_ERR(event
)) {
2109 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2110 probe_desc
->event_desc
[i
]->event_name
);
2117 * Create event if it is missing and present in the list of tracepoint probes.
2118 * Should be called with sessions mutex held.
2121 void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2125 switch (event_enabler
->event_param
.instrumentation
) {
2126 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2127 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler
);
2130 case LTTNG_KERNEL_ABI_SYSCALL
:
2131 ret
= lttng_event_enabler_create_syscall_events_if_missing(event_enabler
);
2142 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2143 struct lttng_kernel_event_common
*event
)
2145 /* Link filter bytecodes if not linked yet. */
2146 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2147 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2151 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2152 struct lttng_kernel_event_common
*event
)
2154 switch (event_enabler
->enabler_type
) {
2155 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2157 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2159 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2160 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2161 struct lttng_kernel_event_notifier
*event_notifier
=
2162 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2164 /* Link capture bytecodes if not linked yet. */
2165 lttng_enabler_link_bytecode(event
->priv
->desc
,
2166 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2167 &event_notifier_enabler
->capture_bytecode_head
);
2168 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2177 * Create events associated with an event_enabler (if not already present),
2178 * and add backward reference from the event to the enabler.
2179 * Should be called with sessions mutex held.
2182 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2184 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2185 struct lttng_kernel_event_common_private
*event_priv
;
2187 lttng_syscall_table_set_wildcard_all(event_enabler
);
2189 /* First ensure that probe events are created for this enabler. */
2190 lttng_event_enabler_create_events_if_missing(event_enabler
);
2192 /* Link the created event with its associated enabler. */
2193 list_for_each_entry(event_priv
, event_list_head
, node
) {
2194 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2195 struct lttng_enabler_ref
*enabler_ref
;
2197 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2200 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2203 * If no backward ref, create it.
2204 * Add backward ref from event_notifier to enabler.
2206 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2210 enabler_ref
->ref
= event_enabler
;
2211 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2214 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2215 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2221 * Called at module load: connect the probe on all enablers matching
2223 * Called with sessions lock held.
2225 int lttng_fix_pending_events(void)
2227 struct lttng_kernel_session_private
*session_priv
;
2229 list_for_each_entry(session_priv
, &sessions
, list
)
2230 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2234 static bool lttng_event_notifier_group_has_active_event_notifiers(
2235 struct lttng_event_notifier_group
*event_notifier_group
)
2237 struct lttng_event_enabler_common
*event_enabler
;
2239 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2240 if (event_enabler
->enabled
)
2246 bool lttng_event_notifier_active(void)
2248 struct lttng_event_notifier_group
*event_notifier_group
;
2250 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2251 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2257 int lttng_fix_pending_event_notifiers(void)
2259 struct lttng_event_notifier_group
*event_notifier_group
;
2261 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2262 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2266 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2267 enum lttng_enabler_format_type format_type
,
2268 struct lttng_kernel_abi_event
*event_param
,
2269 struct lttng_kernel_channel_buffer
*chan
)
2271 struct lttng_event_recorder_enabler
*event_enabler
;
2273 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2276 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2277 event_enabler
->parent
.format_type
= format_type
;
2278 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2279 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2280 sizeof(event_enabler
->parent
.event_param
));
2281 event_enabler
->chan
= chan
;
2283 event_enabler
->parent
.enabled
= 0;
2284 return event_enabler
;
2287 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2288 struct lttng_event_recorder_enabler
*event_enabler
)
2290 mutex_lock(&sessions_mutex
);
2291 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2292 event_enabler
->parent
.published
= true;
2293 lttng_session_lazy_sync_event_enablers(session
);
2294 mutex_unlock(&sessions_mutex
);
2297 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2299 mutex_lock(&sessions_mutex
);
2300 event_enabler
->enabled
= 1;
2301 lttng_event_enabler_sync(event_enabler
);
2302 mutex_unlock(&sessions_mutex
);
2306 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2308 mutex_lock(&sessions_mutex
);
2309 event_enabler
->enabled
= 0;
2310 lttng_event_enabler_sync(event_enabler
);
2311 mutex_unlock(&sessions_mutex
);
2316 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2317 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2319 struct lttng_kernel_bytecode_node
*bytecode_node
;
2320 uint32_t bytecode_len
;
2323 ret
= get_user(bytecode_len
, &bytecode
->len
);
2326 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2330 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2331 sizeof(*bytecode
) + bytecode_len
);
2335 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2336 bytecode_node
->enabler
= enabler
;
2337 /* Enforce length based on allocated size */
2338 bytecode_node
->bc
.len
= bytecode_len
;
2339 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2344 lttng_kvfree(bytecode_node
);
2348 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2349 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2352 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2355 lttng_event_enabler_sync(event_enabler
);
2362 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2363 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2366 switch (event
->priv
->instrumentation
) {
2367 case LTTNG_KERNEL_ABI_UPROBE
:
2368 return lttng_uprobes_event_add_callsite(event
, callsite
);
2375 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2377 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2379 /* Destroy filter bytecode */
2380 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2381 &enabler
->filter_bytecode_head
, node
) {
2382 lttng_kvfree(filter_node
);
2386 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2388 lttng_enabler_destroy(event_enabler
);
2389 if (event_enabler
->published
)
2390 list_del(&event_enabler
->node
);
2392 switch (event_enabler
->enabler_type
) {
2393 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2395 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2396 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2398 kfree(event_recorder_enabler
);
2401 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2403 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2404 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2406 kfree(event_notifier_enabler
);
2414 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2415 enum lttng_enabler_format_type format_type
,
2416 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2417 struct lttng_event_notifier_group
*event_notifier_group
)
2419 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2421 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2422 if (!event_notifier_enabler
)
2425 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2426 event_notifier_enabler
->parent
.format_type
= format_type
;
2427 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2428 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2430 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2431 event_notifier_enabler
->num_captures
= 0;
2433 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2434 sizeof(event_notifier_enabler
->parent
.event_param
));
2436 event_notifier_enabler
->parent
.enabled
= 0;
2437 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2438 event_notifier_enabler
->group
= event_notifier_group
;
2439 return event_notifier_enabler
;
2442 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2443 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2445 mutex_lock(&sessions_mutex
);
2446 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2447 event_notifier_enabler
->parent
.published
= true;
2448 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2449 mutex_unlock(&sessions_mutex
);
2452 int lttng_event_notifier_enabler_enable(
2453 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2455 mutex_lock(&sessions_mutex
);
2456 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2457 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2458 mutex_unlock(&sessions_mutex
);
2462 int lttng_event_notifier_enabler_disable(
2463 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2465 mutex_lock(&sessions_mutex
);
2466 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2467 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2468 mutex_unlock(&sessions_mutex
);
2472 int lttng_event_notifier_enabler_attach_capture_bytecode(
2473 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2474 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2476 struct lttng_kernel_bytecode_node
*bytecode_node
;
2477 struct lttng_event_enabler_common
*enabler
=
2478 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2479 uint32_t bytecode_len
;
2482 ret
= get_user(bytecode_len
, &bytecode
->len
);
2486 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2491 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2492 sizeof(*bytecode
) + bytecode_len
);
2496 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2497 bytecode_node
->enabler
= enabler
;
2499 /* Enforce length based on allocated size */
2500 bytecode_node
->bc
.len
= bytecode_len
;
2501 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2503 event_notifier_enabler
->num_captures
++;
2505 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2509 lttng_kvfree(bytecode_node
);
2515 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2517 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2518 struct lttng_kernel_bytecode_runtime
*runtime
;
2519 struct lttng_enabler_ref
*enabler_ref
;
2521 /* Check if has enablers without bytecode enabled */
2522 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2523 if (enabler_ref
->ref
->enabled
2524 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2525 has_enablers_without_filter_bytecode
= 1;
2529 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2531 /* Enable filters */
2532 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2533 lttng_bytecode_sync_state(runtime
);
2536 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2540 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2542 switch (event
->type
) {
2543 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2545 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2547 struct lttng_kernel_event_notifier
*event_notifier
=
2548 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2549 struct lttng_kernel_bytecode_runtime
*runtime
;
2550 int nr_captures
= 0;
2552 /* Enable captures */
2553 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2554 lttng_bytecode_sync_state(runtime
);
2557 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2566 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2568 struct lttng_enabler_ref
*enabler_ref
;
2569 bool enabled
= false;
2571 switch (event
->priv
->instrumentation
) {
2572 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2574 case LTTNG_KERNEL_ABI_SYSCALL
:
2576 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2577 if (enabler_ref
->ref
->enabled
) {
2588 switch (event
->type
) {
2589 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2591 struct lttng_kernel_event_recorder
*event_recorder
=
2592 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2595 * Enabled state is based on union of enablers, with
2596 * intersection of session and channel transient enable
2599 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2601 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2610 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2612 switch (event
->priv
->instrumentation
) {
2613 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2615 case LTTNG_KERNEL_ABI_SYSCALL
:
2619 /* Not handled with lazy sync. */
2625 * Should be called with sessions mutex held.
2628 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2629 struct list_head
*event_list
)
2631 struct lttng_kernel_event_common_private
*event_priv
;
2632 struct lttng_event_enabler_common
*event_enabler
;
2634 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2635 lttng_event_enabler_ref_events(event_enabler
);
2638 * For each event, if at least one of its enablers is enabled,
2639 * and its channel and session transient states are enabled, we
2640 * enable the event, else we disable it.
2642 list_for_each_entry(event_priv
, event_list
, node
) {
2643 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2646 if (!lttng_event_is_lazy_sync(event
))
2649 enabled
= lttng_get_event_enabled_state(event
);
2650 WRITE_ONCE(event
->enabled
, enabled
);
2652 * Sync tracepoint registration with event enabled state.
2655 register_event(event
);
2657 _lttng_event_unregister(event
);
2660 lttng_event_sync_filter_state(event
);
2661 lttng_event_sync_capture_state(event
);
2666 * lttng_session_sync_event_enablers should be called just before starting a
2670 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2672 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2676 * Apply enablers to session events, adding events to session if need
2677 * be. It is required after each modification applied to an active
2678 * session, and right before session "start".
2679 * "lazy" sync means we only sync if required.
2680 * Should be called with sessions mutex held.
2683 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2685 /* We can skip if session is not active */
2686 if (!session
->active
)
2688 lttng_session_sync_event_enablers(session
);
2692 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2694 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2698 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2700 switch (event_enabler
->enabler_type
) {
2701 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2703 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2704 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2705 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2708 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2710 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2711 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2712 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2721 * Serialize at most one packet worth of metadata into a metadata
2723 * We grab the metadata cache mutex to get exclusive access to our metadata
2724 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2725 * allows us to do racy operations such as looking for remaining space left in
2726 * packet and write, since mutual exclusion protects us from concurrent writes.
2727 * Mutual exclusion on the metadata cache allow us to read the cache content
2728 * without racing against reallocation of the cache by updates.
2729 * Returns the number of bytes written in the channel, 0 if no data
2730 * was written and a negative value on error.
2732 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2733 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2735 struct lttng_kernel_ring_buffer_ctx ctx
;
2737 size_t len
, reserve_len
;
2740 * Ensure we support mutiple get_next / put sequences followed by
2741 * put_next. The metadata cache lock protects reading the metadata
2742 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2743 * "flush" operations on the buffer invoked by different processes.
2744 * Moreover, since the metadata cache memory can be reallocated, we
2745 * need to have exclusive access against updates even though we only
2748 mutex_lock(&stream
->metadata_cache
->lock
);
2749 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2750 if (stream
->metadata_in
!= stream
->metadata_out
)
2753 /* Metadata regenerated, change the version. */
2754 if (stream
->metadata_cache
->version
!= stream
->version
)
2755 stream
->version
= stream
->metadata_cache
->version
;
2757 len
= stream
->metadata_cache
->metadata_written
-
2758 stream
->metadata_in
;
2761 reserve_len
= min_t(size_t,
2762 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2764 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2765 sizeof(char), NULL
);
2767 * If reservation failed, return an error to the caller.
2769 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2771 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2772 stream
->coherent
= false;
2775 stream
->transport
->ops
.event_write(&ctx
,
2776 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2778 stream
->transport
->ops
.event_commit(&ctx
);
2779 stream
->metadata_in
+= reserve_len
;
2780 if (reserve_len
< len
)
2781 stream
->coherent
= false;
2783 stream
->coherent
= true;
2788 *coherent
= stream
->coherent
;
2789 mutex_unlock(&stream
->metadata_cache
->lock
);
2794 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2796 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2797 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2801 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2803 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2804 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2805 struct lttng_metadata_stream
*stream
;
2807 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2808 wake_up_interruptible(&stream
->read_wait
);
2809 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2814 * Write the metadata to the metadata cache.
2815 * Must be called with sessions_mutex held.
2816 * The metadata cache lock protects us from concurrent read access from
2817 * thread outputting metadata content to ring buffer.
2818 * The content of the printf is printed as a single atomic metadata
2821 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2822 const char *fmt
, ...)
2828 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2831 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2837 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2838 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2839 session
->priv
->metadata_cache
->cache_alloc
) {
2840 char *tmp_cache_realloc
;
2841 unsigned int tmp_cache_alloc_size
;
2843 tmp_cache_alloc_size
= max_t(unsigned int,
2844 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2845 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2846 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2847 if (!tmp_cache_realloc
)
2849 if (session
->priv
->metadata_cache
->data
) {
2850 memcpy(tmp_cache_realloc
,
2851 session
->priv
->metadata_cache
->data
,
2852 session
->priv
->metadata_cache
->cache_alloc
);
2853 vfree(session
->priv
->metadata_cache
->data
);
2856 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2857 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2859 memcpy(session
->priv
->metadata_cache
->data
+
2860 session
->priv
->metadata_cache
->metadata_written
,
2862 session
->priv
->metadata_cache
->metadata_written
+= len
;
2873 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2877 for (i
= 0; i
< nesting
; i
++) {
2880 ret
= lttng_metadata_printf(session
, " ");
2889 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2890 const struct lttng_kernel_event_field
*field
,
2893 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2897 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2898 const struct lttng_kernel_type_integer
*type
,
2899 enum lttng_kernel_string_encoding parent_encoding
,
2904 ret
= print_tabs(session
, nesting
);
2907 ret
= lttng_metadata_printf(session
,
2908 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2912 (parent_encoding
== lttng_kernel_string_encoding_none
)
2914 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
2918 #if __BYTE_ORDER == __BIG_ENDIAN
2919 type
->reverse_byte_order
? " byte_order = le;" : ""
2921 type
->reverse_byte_order
? " byte_order = be;" : ""
2928 * Must be called with sessions_mutex held.
2931 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
2932 const struct lttng_kernel_type_struct
*type
,
2935 const char *prev_field_name
= NULL
;
2937 uint32_t i
, nr_fields
;
2938 unsigned int alignment
;
2940 ret
= print_tabs(session
, nesting
);
2943 ret
= lttng_metadata_printf(session
,
2947 nr_fields
= type
->nr_fields
;
2948 for (i
= 0; i
< nr_fields
; i
++) {
2949 const struct lttng_kernel_event_field
*iter_field
;
2951 iter_field
= type
->fields
[i
];
2952 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
2956 ret
= print_tabs(session
, nesting
);
2959 alignment
= type
->alignment
;
2961 ret
= lttng_metadata_printf(session
,
2965 ret
= lttng_metadata_printf(session
,
2972 * Must be called with sessions_mutex held.
2975 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
2976 const struct lttng_kernel_event_field
*field
,
2981 ret
= _lttng_struct_type_statedump(session
,
2982 lttng_kernel_get_type_struct(field
->type
), nesting
);
2985 return lttng_field_name_statedump(session
, field
, nesting
);
2989 * Must be called with sessions_mutex held.
2992 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
2993 const struct lttng_kernel_type_variant
*type
,
2995 const char *prev_field_name
)
2997 const char *tag_name
;
2999 uint32_t i
, nr_choices
;
3001 tag_name
= type
->tag_name
;
3003 tag_name
= prev_field_name
;
3007 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3009 if (type
->alignment
!= 0)
3011 ret
= print_tabs(session
, nesting
);
3014 ret
= lttng_metadata_printf(session
,
3015 "variant <_%s> {\n",
3019 nr_choices
= type
->nr_choices
;
3020 for (i
= 0; i
< nr_choices
; i
++) {
3021 const struct lttng_kernel_event_field
*iter_field
;
3023 iter_field
= type
->choices
[i
];
3024 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3028 ret
= print_tabs(session
, nesting
);
3031 ret
= lttng_metadata_printf(session
,
3037 * Must be called with sessions_mutex held.
3040 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3041 const struct lttng_kernel_event_field
*field
,
3043 const char *prev_field_name
)
3047 ret
= _lttng_variant_type_statedump(session
,
3048 lttng_kernel_get_type_variant(field
->type
), nesting
,
3052 return lttng_field_name_statedump(session
, field
, nesting
);
3056 * Must be called with sessions_mutex held.
3059 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3060 const struct lttng_kernel_event_field
*field
,
3064 const struct lttng_kernel_type_array
*array_type
;
3065 const struct lttng_kernel_type_common
*elem_type
;
3067 array_type
= lttng_kernel_get_type_array(field
->type
);
3068 WARN_ON_ONCE(!array_type
);
3070 if (array_type
->alignment
) {
3071 ret
= print_tabs(session
, nesting
);
3074 ret
= lttng_metadata_printf(session
,
3075 "struct { } align(%u) _%s_padding;\n",
3076 array_type
->alignment
* CHAR_BIT
,
3082 * Nested compound types: Only array of structures and variants are
3083 * currently supported.
3085 elem_type
= array_type
->elem_type
;
3086 switch (elem_type
->type
) {
3087 case lttng_kernel_type_integer
:
3088 case lttng_kernel_type_struct
:
3089 case lttng_kernel_type_variant
:
3090 ret
= _lttng_type_statedump(session
, elem_type
,
3091 array_type
->encoding
, nesting
);
3099 ret
= lttng_metadata_printf(session
,
3102 array_type
->length
);
3107 * Must be called with sessions_mutex held.
3110 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3111 const struct lttng_kernel_event_field
*field
,
3113 const char *prev_field_name
)
3116 const char *length_name
;
3117 const struct lttng_kernel_type_sequence
*sequence_type
;
3118 const struct lttng_kernel_type_common
*elem_type
;
3120 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3121 WARN_ON_ONCE(!sequence_type
);
3123 length_name
= sequence_type
->length_name
;
3125 length_name
= prev_field_name
;
3129 if (sequence_type
->alignment
) {
3130 ret
= print_tabs(session
, nesting
);
3133 ret
= lttng_metadata_printf(session
,
3134 "struct { } align(%u) _%s_padding;\n",
3135 sequence_type
->alignment
* CHAR_BIT
,
3142 * Nested compound types: Only array of structures and variants are
3143 * currently supported.
3145 elem_type
= sequence_type
->elem_type
;
3146 switch (elem_type
->type
) {
3147 case lttng_kernel_type_integer
:
3148 case lttng_kernel_type_struct
:
3149 case lttng_kernel_type_variant
:
3150 ret
= _lttng_type_statedump(session
, elem_type
,
3151 sequence_type
->encoding
, nesting
);
3159 ret
= lttng_metadata_printf(session
,
3167 * Must be called with sessions_mutex held.
3170 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3171 const struct lttng_kernel_type_enum
*type
,
3174 const struct lttng_kernel_enum_desc
*enum_desc
;
3175 const struct lttng_kernel_type_common
*container_type
;
3177 unsigned int i
, nr_entries
;
3179 container_type
= type
->container_type
;
3180 if (container_type
->type
!= lttng_kernel_type_integer
) {
3184 enum_desc
= type
->desc
;
3185 nr_entries
= enum_desc
->nr_entries
;
3187 ret
= print_tabs(session
, nesting
);
3190 ret
= lttng_metadata_printf(session
, "enum : ");
3193 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3194 lttng_kernel_string_encoding_none
, 0);
3197 ret
= lttng_metadata_printf(session
, " {\n");
3200 /* Dump all entries */
3201 for (i
= 0; i
< nr_entries
; i
++) {
3202 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3205 ret
= print_tabs(session
, nesting
+ 1);
3208 ret
= lttng_metadata_printf(session
,
3212 len
= strlen(entry
->string
);
3213 /* Escape the character '"' */
3214 for (j
= 0; j
< len
; j
++) {
3215 char c
= entry
->string
[j
];
3219 ret
= lttng_metadata_printf(session
,
3223 ret
= lttng_metadata_printf(session
,
3227 ret
= lttng_metadata_printf(session
,
3234 ret
= lttng_metadata_printf(session
, "\"");
3238 if (entry
->options
.is_auto
) {
3239 ret
= lttng_metadata_printf(session
, ",\n");
3243 ret
= lttng_metadata_printf(session
,
3247 if (entry
->start
.signedness
)
3248 ret
= lttng_metadata_printf(session
,
3249 "%lld", (long long) entry
->start
.value
);
3251 ret
= lttng_metadata_printf(session
,
3252 "%llu", entry
->start
.value
);
3255 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3257 == entry
->end
.value
) {
3258 ret
= lttng_metadata_printf(session
,
3261 if (entry
->end
.signedness
) {
3262 ret
= lttng_metadata_printf(session
,
3264 (long long) entry
->end
.value
);
3266 ret
= lttng_metadata_printf(session
,
3275 ret
= print_tabs(session
, nesting
);
3278 ret
= lttng_metadata_printf(session
, "}");
3284 * Must be called with sessions_mutex held.
3287 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3288 const struct lttng_kernel_event_field
*field
,
3292 const struct lttng_kernel_type_enum
*enum_type
;
3294 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3295 WARN_ON_ONCE(!enum_type
);
3296 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3299 return lttng_field_name_statedump(session
, field
, nesting
);
3303 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3304 const struct lttng_kernel_event_field
*field
,
3309 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3310 lttng_kernel_string_encoding_none
, nesting
);
3313 return lttng_field_name_statedump(session
, field
, nesting
);
3317 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3318 const struct lttng_kernel_type_string
*type
,
3323 /* Default encoding is UTF8 */
3324 ret
= print_tabs(session
, nesting
);
3327 ret
= lttng_metadata_printf(session
,
3329 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3330 " { encoding = ASCII; }" : "");
3335 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3336 const struct lttng_kernel_event_field
*field
,
3339 const struct lttng_kernel_type_string
*string_type
;
3342 string_type
= lttng_kernel_get_type_string(field
->type
);
3343 WARN_ON_ONCE(!string_type
);
3344 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3347 return lttng_field_name_statedump(session
, field
, nesting
);
3351 * Must be called with sessions_mutex held.
3354 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3355 const struct lttng_kernel_type_common
*type
,
3356 enum lttng_kernel_string_encoding parent_encoding
,
3361 switch (type
->type
) {
3362 case lttng_kernel_type_integer
:
3363 ret
= _lttng_integer_type_statedump(session
,
3364 lttng_kernel_get_type_integer(type
),
3365 parent_encoding
, nesting
);
3367 case lttng_kernel_type_enum
:
3368 ret
= _lttng_enum_type_statedump(session
,
3369 lttng_kernel_get_type_enum(type
),
3372 case lttng_kernel_type_string
:
3373 ret
= _lttng_string_type_statedump(session
,
3374 lttng_kernel_get_type_string(type
),
3377 case lttng_kernel_type_struct
:
3378 ret
= _lttng_struct_type_statedump(session
,
3379 lttng_kernel_get_type_struct(type
),
3382 case lttng_kernel_type_variant
:
3383 ret
= _lttng_variant_type_statedump(session
,
3384 lttng_kernel_get_type_variant(type
),
3388 /* Nested arrays and sequences are not supported yet. */
3389 case lttng_kernel_type_array
:
3390 case lttng_kernel_type_sequence
:
3399 * Must be called with sessions_mutex held.
3402 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3403 const struct lttng_kernel_event_field
*field
,
3405 const char **prev_field_name_p
)
3407 const char *prev_field_name
= NULL
;
3410 if (prev_field_name_p
)
3411 prev_field_name
= *prev_field_name_p
;
3412 switch (field
->type
->type
) {
3413 case lttng_kernel_type_integer
:
3414 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3416 case lttng_kernel_type_enum
:
3417 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3419 case lttng_kernel_type_string
:
3420 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3422 case lttng_kernel_type_struct
:
3423 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3425 case lttng_kernel_type_array
:
3426 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3428 case lttng_kernel_type_sequence
:
3429 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3431 case lttng_kernel_type_variant
:
3432 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3439 if (prev_field_name_p
)
3440 *prev_field_name_p
= field
->name
;
3445 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3446 struct lttng_kernel_ctx
*ctx
)
3448 const char *prev_field_name
= NULL
;
3454 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3455 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3457 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3465 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3466 struct lttng_kernel_event_recorder
*event_recorder
)
3468 const char *prev_field_name
= NULL
;
3469 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3473 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3474 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3476 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3484 * Must be called with sessions_mutex held.
3485 * The entire event metadata is printed as a single atomic metadata
3489 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3491 struct lttng_kernel_event_recorder
*event_recorder
;
3492 struct lttng_kernel_channel_buffer
*chan
;
3493 struct lttng_kernel_session
*session
;
3496 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3498 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3499 chan
= event_recorder
->chan
;
3500 session
= chan
->parent
.session
;
3502 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3504 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3507 lttng_metadata_begin(session
);
3509 ret
= lttng_metadata_printf(session
,
3513 " stream_id = %u;\n",
3514 event_recorder
->priv
->parent
.desc
->event_name
,
3515 event_recorder
->priv
->id
,
3516 event_recorder
->chan
->priv
->id
);
3520 ret
= lttng_metadata_printf(session
,
3521 " fields := struct {\n"
3526 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3531 * LTTng space reservation can only reserve multiples of the
3534 ret
= lttng_metadata_printf(session
,
3540 event_recorder
->priv
->metadata_dumped
= 1;
3542 lttng_metadata_end(session
);
3548 * Must be called with sessions_mutex held.
3549 * The entire channel metadata is printed as a single atomic metadata
3553 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3554 struct lttng_kernel_channel_buffer
*chan
)
3558 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3561 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3564 lttng_metadata_begin(session
);
3566 WARN_ON_ONCE(!chan
->priv
->header_type
);
3567 ret
= lttng_metadata_printf(session
,
3570 " event.header := %s;\n"
3571 " packet.context := struct packet_context;\n",
3573 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3574 "struct event_header_large");
3578 if (chan
->priv
->ctx
) {
3579 ret
= lttng_metadata_printf(session
,
3580 " event.context := struct {\n");
3584 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3587 if (chan
->priv
->ctx
) {
3588 ret
= lttng_metadata_printf(session
,
3594 ret
= lttng_metadata_printf(session
,
3597 chan
->priv
->metadata_dumped
= 1;
3599 lttng_metadata_end(session
);
3604 * Must be called with sessions_mutex held.
3607 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3609 return lttng_metadata_printf(session
,
3610 "struct packet_context {\n"
3611 " uint64_clock_monotonic_t timestamp_begin;\n"
3612 " uint64_clock_monotonic_t timestamp_end;\n"
3613 " uint64_t content_size;\n"
3614 " uint64_t packet_size;\n"
3615 " uint64_t packet_seq_num;\n"
3616 " unsigned long events_discarded;\n"
3617 " uint32_t cpu_id;\n"
3624 * id: range: 0 - 30.
3625 * id 31 is reserved to indicate an extended header.
3628 * id: range: 0 - 65534.
3629 * id 65535 is reserved to indicate an extended header.
3631 * Must be called with sessions_mutex held.
3634 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3636 return lttng_metadata_printf(session
,
3637 "struct event_header_compact {\n"
3638 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3641 " uint27_clock_monotonic_t timestamp;\n"
3645 " uint64_clock_monotonic_t timestamp;\n"
3650 "struct event_header_large {\n"
3651 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3654 " uint32_clock_monotonic_t timestamp;\n"
3658 " uint64_clock_monotonic_t timestamp;\n"
3662 lttng_alignof(uint32_t) * CHAR_BIT
,
3663 lttng_alignof(uint16_t) * CHAR_BIT
3668 * Approximation of NTP time of day to clock monotonic correlation,
3669 * taken at start of trace.
3670 * Yes, this is only an approximation. Yes, we can (and will) do better
3671 * in future versions.
3672 * This function may return a negative offset. It may happen if the
3673 * system sets the REALTIME clock to 0 after boot.
3675 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3679 int64_t measure_clock_offset(void)
3681 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3682 uint64_t tcf
= trace_clock_freq();
3684 unsigned long flags
;
3685 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3686 struct timespec64 rts
= { 0, 0 };
3688 struct timespec rts
= { 0, 0 };
3691 /* Disable interrupts to increase correlation precision. */
3692 local_irq_save(flags
);
3693 monotonic
[0] = trace_clock_read64();
3694 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3695 ktime_get_real_ts64(&rts
);
3697 getnstimeofday(&rts
);
3699 monotonic
[1] = trace_clock_read64();
3700 local_irq_restore(flags
);
3702 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3703 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3704 if (tcf
== NSEC_PER_SEC
) {
3705 realtime
+= rts
.tv_nsec
;
3707 uint64_t n
= rts
.tv_nsec
* tcf
;
3709 do_div(n
, NSEC_PER_SEC
);
3712 offset
= (int64_t) realtime
- monotonic_avg
;
3717 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3725 while (cur
!= '\0') {
3728 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3732 ret
= lttng_metadata_printf(session
, "%c", '\\');
3735 /* We still print the current char */
3738 ret
= lttng_metadata_printf(session
, "%c", cur
);
3752 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3753 const char *field_value
)
3757 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3761 ret
= print_escaped_ctf_string(session
, field_value
);
3765 ret
= lttng_metadata_printf(session
, "\";\n");
3772 * Output metadata into this session's metadata buffers.
3773 * Must be called with sessions_mutex held.
3776 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3778 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3779 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3780 const char *product_uuid
;
3781 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3782 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3785 if (!LTTNG_READ_ONCE(session
->active
))
3788 lttng_metadata_begin(session
);
3790 if (session
->priv
->metadata_dumped
)
3793 snprintf(uuid_s
, sizeof(uuid_s
),
3794 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3795 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3796 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3797 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3798 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3800 ret
= lttng_metadata_printf(session
,
3801 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3802 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3803 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3804 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3805 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3806 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3807 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3813 " byte_order = %s;\n"
3814 " packet.header := struct {\n"
3815 " uint32_t magic;\n"
3816 " uint8_t uuid[16];\n"
3817 " uint32_t stream_id;\n"
3818 " uint64_t stream_instance_id;\n"
3821 lttng_alignof(uint8_t) * CHAR_BIT
,
3822 lttng_alignof(uint16_t) * CHAR_BIT
,
3823 lttng_alignof(uint32_t) * CHAR_BIT
,
3824 lttng_alignof(uint64_t) * CHAR_BIT
,
3825 sizeof(unsigned long) * CHAR_BIT
,
3826 lttng_alignof(unsigned long) * CHAR_BIT
,
3830 #if __BYTE_ORDER == __BIG_ENDIAN
3839 ret
= lttng_metadata_printf(session
,
3841 " hostname = \"%s\";\n"
3842 " domain = \"kernel\";\n"
3843 " sysname = \"%s\";\n"
3844 " kernel_release = \"%s\";\n"
3845 " kernel_version = \"%s\";\n"
3846 " tracer_name = \"lttng-modules\";\n"
3847 " tracer_major = %d;\n"
3848 " tracer_minor = %d;\n"
3849 " tracer_patchlevel = %d;\n"
3850 " trace_buffering_scheme = \"global\";\n",
3851 current
->nsproxy
->uts_ns
->name
.nodename
,
3855 LTTNG_MODULES_MAJOR_VERSION
,
3856 LTTNG_MODULES_MINOR_VERSION
,
3857 LTTNG_MODULES_PATCHLEVEL_VERSION
3862 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3865 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3866 session
->priv
->creation_time
);
3870 /* Add the product UUID to the 'env' section */
3871 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3873 ret
= lttng_metadata_printf(session
,
3874 " product_uuid = \"%s\";\n",
3881 /* Close the 'env' section */
3882 ret
= lttng_metadata_printf(session
, "};\n\n");
3886 ret
= lttng_metadata_printf(session
,
3888 " name = \"%s\";\n",
3894 if (!trace_clock_uuid(clock_uuid_s
)) {
3895 ret
= lttng_metadata_printf(session
,
3896 " uuid = \"%s\";\n",
3903 ret
= lttng_metadata_printf(session
,
3904 " description = \"%s\";\n"
3905 " freq = %llu; /* Frequency, in Hz */\n"
3906 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3909 trace_clock_description(),
3910 (unsigned long long) trace_clock_freq(),
3911 (long long) measure_clock_offset()
3916 ret
= lttng_metadata_printf(session
,
3917 "typealias integer {\n"
3918 " size = 27; align = 1; signed = false;\n"
3919 " map = clock.%s.value;\n"
3920 "} := uint27_clock_monotonic_t;\n"
3922 "typealias integer {\n"
3923 " size = 32; align = %u; signed = false;\n"
3924 " map = clock.%s.value;\n"
3925 "} := uint32_clock_monotonic_t;\n"
3927 "typealias integer {\n"
3928 " size = 64; align = %u; signed = false;\n"
3929 " map = clock.%s.value;\n"
3930 "} := uint64_clock_monotonic_t;\n\n",
3932 lttng_alignof(uint32_t) * CHAR_BIT
,
3934 lttng_alignof(uint64_t) * CHAR_BIT
,
3940 ret
= _lttng_stream_packet_context_declare(session
);
3944 ret
= _lttng_event_header_declare(session
);
3949 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
3950 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
3955 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
3956 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
3960 session
->priv
->metadata_dumped
= 1;
3962 lttng_metadata_end(session
);
3967 * lttng_transport_register - LTT transport registration
3968 * @transport: transport structure
3970 * Registers a transport which can be used as output to extract the data out of
3971 * LTTng. The module calling this registration function must ensure that no
3972 * trap-inducing code will be executed by the transport functions. E.g.
3973 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3974 * is made visible to the transport function. This registration acts as a
3975 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3976 * after its registration must it synchronize the TLBs.
3978 void lttng_transport_register(struct lttng_transport
*transport
)
3981 * Make sure no page fault can be triggered by the module about to be
3982 * registered. We deal with this here so we don't have to call
3983 * vmalloc_sync_mappings() in each module's init.
3985 wrapper_vmalloc_sync_mappings();
3987 mutex_lock(&sessions_mutex
);
3988 list_add_tail(&transport
->node
, <tng_transport_list
);
3989 mutex_unlock(&sessions_mutex
);
3991 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3994 * lttng_transport_unregister - LTT transport unregistration
3995 * @transport: transport structure
3997 void lttng_transport_unregister(struct lttng_transport
*transport
)
3999 mutex_lock(&sessions_mutex
);
4000 list_del(&transport
->node
);
4001 mutex_unlock(&sessions_mutex
);
4003 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4005 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4008 * Make sure no page fault can be triggered by the module about to be
4009 * registered. We deal with this here so we don't have to call
4010 * vmalloc_sync_mappings() in each module's init.
4012 wrapper_vmalloc_sync_mappings();
4014 mutex_lock(&sessions_mutex
);
4015 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4016 mutex_unlock(&sessions_mutex
);
4018 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4020 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4022 mutex_lock(&sessions_mutex
);
4023 list_del(&transport
->node
);
4024 mutex_unlock(&sessions_mutex
);
4026 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4028 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4030 enum cpuhp_state lttng_hp_prepare
;
4031 enum cpuhp_state lttng_hp_online
;
4033 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4035 struct lttng_cpuhp_node
*lttng_node
;
4037 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4038 switch (lttng_node
->component
) {
4039 case LTTNG_RING_BUFFER_FRONTEND
:
4041 case LTTNG_RING_BUFFER_BACKEND
:
4042 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4043 case LTTNG_RING_BUFFER_ITER
:
4045 case LTTNG_CONTEXT_PERF_COUNTERS
:
4052 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4054 struct lttng_cpuhp_node
*lttng_node
;
4056 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4057 switch (lttng_node
->component
) {
4058 case LTTNG_RING_BUFFER_FRONTEND
:
4059 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4060 case LTTNG_RING_BUFFER_BACKEND
:
4062 case LTTNG_RING_BUFFER_ITER
:
4064 case LTTNG_CONTEXT_PERF_COUNTERS
:
4065 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4071 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4073 struct lttng_cpuhp_node
*lttng_node
;
4075 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4076 switch (lttng_node
->component
) {
4077 case LTTNG_RING_BUFFER_FRONTEND
:
4078 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4079 case LTTNG_RING_BUFFER_BACKEND
:
4081 case LTTNG_RING_BUFFER_ITER
:
4082 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4083 case LTTNG_CONTEXT_PERF_COUNTERS
:
4084 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4090 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4092 struct lttng_cpuhp_node
*lttng_node
;
4094 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4095 switch (lttng_node
->component
) {
4096 case LTTNG_RING_BUFFER_FRONTEND
:
4097 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4098 case LTTNG_RING_BUFFER_BACKEND
:
4100 case LTTNG_RING_BUFFER_ITER
:
4102 case LTTNG_CONTEXT_PERF_COUNTERS
:
4109 static int __init
lttng_init_cpu_hotplug(void)
4113 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4114 lttng_hotplug_prepare
,
4115 lttng_hotplug_dead
);
4119 lttng_hp_prepare
= ret
;
4120 lttng_rb_set_hp_prepare(ret
);
4122 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4123 lttng_hotplug_online
,
4124 lttng_hotplug_offline
);
4126 cpuhp_remove_multi_state(lttng_hp_prepare
);
4127 lttng_hp_prepare
= 0;
4130 lttng_hp_online
= ret
;
4131 lttng_rb_set_hp_online(ret
);
4136 static void __exit
lttng_exit_cpu_hotplug(void)
4138 lttng_rb_set_hp_online(0);
4139 cpuhp_remove_multi_state(lttng_hp_online
);
4140 lttng_rb_set_hp_prepare(0);
4141 cpuhp_remove_multi_state(lttng_hp_prepare
);
4144 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4145 static int lttng_init_cpu_hotplug(void)
4149 static void lttng_exit_cpu_hotplug(void)
4152 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4154 static int __init
lttng_events_init(void)
4158 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4161 ret
= wrapper_get_pfnblock_flags_mask_init();
4164 ret
= wrapper_get_pageblock_flags_mask_init();
4167 ret
= lttng_probes_init();
4170 ret
= lttng_context_init();
4173 ret
= lttng_tracepoint_init();
4176 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4177 if (!event_recorder_cache
) {
4179 goto error_kmem_event_recorder
;
4181 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4182 if (!event_recorder_private_cache
) {
4184 goto error_kmem_event_recorder_private
;
4186 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4187 if (!event_notifier_cache
) {
4189 goto error_kmem_event_notifier
;
4191 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4192 if (!event_notifier_private_cache
) {
4194 goto error_kmem_event_notifier_private
;
4196 ret
= lttng_abi_init();
4199 ret
= lttng_logger_init();
4202 ret
= lttng_init_cpu_hotplug();
4205 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4206 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4207 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4208 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4209 LTTNG_MODULES_EXTRAVERSION
,
4211 #ifdef LTTNG_EXTRA_VERSION_GIT
4212 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4216 #ifdef LTTNG_EXTRA_VERSION_NAME
4217 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4221 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4222 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4223 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4227 lttng_logger_exit();
4231 kmem_cache_destroy(event_notifier_private_cache
);
4232 error_kmem_event_notifier_private
:
4233 kmem_cache_destroy(event_notifier_cache
);
4234 error_kmem_event_notifier
:
4235 kmem_cache_destroy(event_recorder_private_cache
);
4236 error_kmem_event_recorder_private
:
4237 kmem_cache_destroy(event_recorder_cache
);
4238 error_kmem_event_recorder
:
4239 lttng_tracepoint_exit();
4241 lttng_context_exit();
4242 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4243 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4244 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4245 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4246 LTTNG_MODULES_EXTRAVERSION
,
4248 #ifdef LTTNG_EXTRA_VERSION_GIT
4249 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4253 #ifdef LTTNG_EXTRA_VERSION_NAME
4254 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4261 module_init(lttng_events_init
);
4263 static void __exit
lttng_events_exit(void)
4265 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4267 lttng_exit_cpu_hotplug();
4268 lttng_logger_exit();
4270 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4271 lttng_session_destroy(session_priv
->pub
);
4272 kmem_cache_destroy(event_recorder_cache
);
4273 kmem_cache_destroy(event_recorder_private_cache
);
4274 kmem_cache_destroy(event_notifier_cache
);
4275 kmem_cache_destroy(event_notifier_private_cache
);
4276 lttng_tracepoint_exit();
4277 lttng_context_exit();
4278 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4279 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4280 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4281 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4282 LTTNG_MODULES_EXTRAVERSION
,
4284 #ifdef LTTNG_EXTRA_VERSION_GIT
4285 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4289 #ifdef LTTNG_EXTRA_VERSION_NAME
4290 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4296 module_exit(lttng_events_exit
);
4298 #include <generated/patches.h>
4299 #ifdef LTTNG_EXTRA_VERSION_GIT
4300 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4302 #ifdef LTTNG_EXTRA_VERSION_NAME
4303 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4305 MODULE_LICENSE("GPL and additional rights");
4306 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4307 MODULE_DESCRIPTION("LTTng tracer");
4308 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4309 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4310 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4311 LTTNG_MODULES_EXTRAVERSION
);