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 <linux/uaccess.h>
27 #include <linux/vmalloc.h>
28 #include <linux/dmi.h>
30 #include <wrapper/compiler_attributes.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/events-internal.h>
40 #include <lttng/lttng-bytecode.h>
41 #include <lttng/tracer.h>
42 #include <lttng/event-notifier-notification.h>
43 #include <lttng/abi-old.h>
44 #include <lttng/endian.h>
45 #include <lttng/string-utils.h>
46 #include <lttng/utils.h>
47 #include <ringbuffer/backend.h>
48 #include <ringbuffer/frontend.h>
49 #include <wrapper/time.h>
51 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0))
52 #include <linux/stdarg.h>
57 #define METADATA_CACHE_DEFAULT_SIZE 4096
59 static LIST_HEAD(sessions
);
60 static LIST_HEAD(event_notifier_groups
);
61 static LIST_HEAD(lttng_transport_list
);
62 static LIST_HEAD(lttng_counter_transport_list
);
64 * Protect the sessions and metadata caches.
66 static DEFINE_MUTEX(sessions_mutex
);
67 static struct kmem_cache
*event_recorder_cache
;
68 static struct kmem_cache
*event_recorder_private_cache
;
69 static struct kmem_cache
*event_notifier_cache
;
70 static struct kmem_cache
*event_notifier_private_cache
;
72 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
73 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
74 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
75 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
77 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
78 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
79 static void _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
81 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
);
83 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
85 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
87 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
88 const struct lttng_kernel_type_common
*type
,
89 enum lttng_kernel_string_encoding parent_encoding
,
92 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
93 const struct lttng_kernel_event_field
*field
,
94 size_t nesting
, const char **prev_field_name_p
);
96 void synchronize_trace(void)
98 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
99 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
105 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
106 #ifdef CONFIG_PREEMPT_RT_FULL
109 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
110 #ifdef CONFIG_PREEMPT_RT
113 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
116 void lttng_lock_sessions(void)
118 mutex_lock(&sessions_mutex
);
121 void lttng_unlock_sessions(void)
123 mutex_unlock(&sessions_mutex
);
126 static struct lttng_transport
*lttng_transport_find(const char *name
)
128 struct lttng_transport
*transport
;
130 list_for_each_entry(transport
, <tng_transport_list
, node
) {
131 if (!strcmp(transport
->name
, name
))
138 * Called with sessions lock held.
140 int lttng_session_active(void)
142 struct lttng_kernel_session_private
*iter
;
144 list_for_each_entry(iter
, &sessions
, list
) {
145 if (iter
->pub
->active
)
151 struct lttng_kernel_session
*lttng_session_create(void)
153 struct lttng_kernel_session
*session
;
154 struct lttng_kernel_session_private
*session_priv
;
155 struct lttng_metadata_cache
*metadata_cache
;
158 mutex_lock(&sessions_mutex
);
159 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
162 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
164 goto err_free_session
;
165 session
->priv
= session_priv
;
166 session_priv
->pub
= session
;
168 INIT_LIST_HEAD(&session_priv
->chan
);
169 INIT_LIST_HEAD(&session_priv
->events
);
170 lttng_guid_gen(&session_priv
->uuid
);
172 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
175 goto err_free_session_private
;
176 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
177 if (!metadata_cache
->data
)
179 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
180 kref_init(&metadata_cache
->refcount
);
181 mutex_init(&metadata_cache
->lock
);
182 session_priv
->metadata_cache
= metadata_cache
;
183 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
184 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
185 sizeof(metadata_cache
->uuid
));
186 INIT_LIST_HEAD(&session_priv
->enablers_head
);
187 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
188 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
189 list_add(&session_priv
->list
, &sessions
);
191 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
192 goto tracker_alloc_error
;
193 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
194 goto tracker_alloc_error
;
195 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
196 goto tracker_alloc_error
;
197 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
198 goto tracker_alloc_error
;
199 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
200 goto tracker_alloc_error
;
201 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
202 goto tracker_alloc_error
;
204 mutex_unlock(&sessions_mutex
);
209 lttng_id_tracker_fini(&session
->pid_tracker
);
210 lttng_id_tracker_fini(&session
->vpid_tracker
);
211 lttng_id_tracker_fini(&session
->uid_tracker
);
212 lttng_id_tracker_fini(&session
->vuid_tracker
);
213 lttng_id_tracker_fini(&session
->gid_tracker
);
214 lttng_id_tracker_fini(&session
->vgid_tracker
);
216 kfree(metadata_cache
);
217 err_free_session_private
:
218 lttng_kvfree(session_priv
);
220 lttng_kvfree(session
);
222 mutex_unlock(&sessions_mutex
);
227 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
229 struct lttng_counter_transport
*transport
;
231 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
232 if (!strcmp(transport
->name
, name
))
238 struct lttng_counter
*lttng_kernel_counter_create(
239 const char *counter_transport_name
,
240 size_t number_dimensions
, const size_t *dimensions_sizes
)
242 struct lttng_counter
*counter
= NULL
;
243 struct lttng_counter_transport
*counter_transport
= NULL
;
245 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
246 if (!counter_transport
) {
247 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
248 counter_transport_name
);
251 if (!try_module_get(counter_transport
->owner
)) {
252 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
256 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
260 /* Create event notifier error counter. */
261 counter
->ops
= &counter_transport
->ops
;
262 counter
->transport
= counter_transport
;
264 counter
->counter
= counter
->ops
->counter_create(
265 number_dimensions
, dimensions_sizes
, 0);
266 if (!counter
->counter
) {
273 lttng_kvfree(counter
);
275 if (counter_transport
)
276 module_put(counter_transport
->owner
);
281 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
283 struct lttng_transport
*transport
= NULL
;
284 struct lttng_event_notifier_group
*event_notifier_group
;
285 const char *transport_name
= "relay-event-notifier";
286 size_t subbuf_size
= 4096; //TODO
287 size_t num_subbuf
= 16; //TODO
288 unsigned int switch_timer_interval
= 0;
289 unsigned int read_timer_interval
= 0;
292 mutex_lock(&sessions_mutex
);
294 transport
= lttng_transport_find(transport_name
);
296 printk(KERN_WARNING
"LTTng: transport %s not found\n",
300 if (!try_module_get(transport
->owner
)) {
301 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
306 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
308 if (!event_notifier_group
)
312 * Initialize the ring buffer used to store event notifier
315 event_notifier_group
->ops
= &transport
->ops
;
316 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
317 transport_name
, event_notifier_group
, NULL
,
318 subbuf_size
, num_subbuf
, switch_timer_interval
,
319 read_timer_interval
);
320 if (!event_notifier_group
->chan
)
323 event_notifier_group
->transport
= transport
;
325 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
326 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
327 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
328 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
330 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
332 mutex_unlock(&sessions_mutex
);
334 return event_notifier_group
;
337 lttng_kvfree(event_notifier_group
);
340 module_put(transport
->owner
);
342 mutex_unlock(&sessions_mutex
);
346 void metadata_cache_destroy(struct kref
*kref
)
348 struct lttng_metadata_cache
*cache
=
349 container_of(kref
, struct lttng_metadata_cache
, refcount
);
354 void lttng_session_destroy(struct lttng_kernel_session
*session
)
356 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
357 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
358 struct lttng_metadata_stream
*metadata_stream
;
359 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
362 mutex_lock(&sessions_mutex
);
363 WRITE_ONCE(session
->active
, 0);
364 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
365 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
368 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
)
369 _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
370 synchronize_trace(); /* Wait for in-flight events to complete */
371 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
372 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
375 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
376 lttng_event_enabler_destroy(event_enabler
);
377 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
378 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
379 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
380 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
381 _lttng_channel_destroy(chan_priv
->pub
);
383 mutex_lock(&session
->priv
->metadata_cache
->lock
);
384 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
385 _lttng_metadata_channel_hangup(metadata_stream
);
386 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
387 lttng_id_tracker_fini(&session
->pid_tracker
);
388 lttng_id_tracker_fini(&session
->vpid_tracker
);
389 lttng_id_tracker_fini(&session
->uid_tracker
);
390 lttng_id_tracker_fini(&session
->vuid_tracker
);
391 lttng_id_tracker_fini(&session
->gid_tracker
);
392 lttng_id_tracker_fini(&session
->vgid_tracker
);
393 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
394 list_del(&session
->priv
->list
);
395 mutex_unlock(&sessions_mutex
);
396 lttng_kvfree(session
->priv
);
397 lttng_kvfree(session
);
400 void lttng_event_notifier_group_destroy(
401 struct lttng_event_notifier_group
*event_notifier_group
)
403 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
404 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
407 if (!event_notifier_group
)
410 mutex_lock(&sessions_mutex
);
412 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
415 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
416 &event_notifier_group
->event_notifiers_head
, parent
.node
)
417 _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
419 /* Wait for in-flight event notifier to complete */
422 irq_work_sync(&event_notifier_group
->wakeup_pending
);
424 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
427 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
428 &event_notifier_group
->enablers_head
, node
)
429 lttng_event_enabler_destroy(event_enabler
);
431 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
432 &event_notifier_group
->event_notifiers_head
, parent
.node
)
433 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
435 if (event_notifier_group
->error_counter
) {
436 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
438 error_counter
->ops
->counter_destroy(error_counter
->counter
);
439 module_put(error_counter
->transport
->owner
);
440 lttng_kvfree(error_counter
);
441 event_notifier_group
->error_counter
= NULL
;
444 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
445 module_put(event_notifier_group
->transport
->owner
);
446 list_del(&event_notifier_group
->node
);
448 mutex_unlock(&sessions_mutex
);
449 lttng_kvfree(event_notifier_group
);
452 int lttng_session_statedump(struct lttng_kernel_session
*session
)
456 mutex_lock(&sessions_mutex
);
457 ret
= lttng_statedump_start(session
);
458 mutex_unlock(&sessions_mutex
);
462 int lttng_session_enable(struct lttng_kernel_session
*session
)
465 struct lttng_kernel_channel_buffer_private
*chan_priv
;
467 mutex_lock(&sessions_mutex
);
468 if (session
->active
) {
473 /* Set transient enabler state to "enabled" */
474 session
->priv
->tstate
= 1;
476 /* We need to sync enablers with session before activation. */
477 lttng_session_sync_event_enablers(session
);
480 * Snapshot the number of events per channel to know the type of header
483 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
484 if (chan_priv
->header_type
)
485 continue; /* don't change it if session stop/restart */
486 if (chan_priv
->free_event_id
< 31)
487 chan_priv
->header_type
= 1; /* compact */
489 chan_priv
->header_type
= 2; /* large */
492 /* Clear each stream's quiescent state. */
493 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
494 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
495 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
498 WRITE_ONCE(session
->active
, 1);
499 WRITE_ONCE(session
->priv
->been_active
, 1);
500 ret
= _lttng_session_metadata_statedump(session
);
502 WRITE_ONCE(session
->active
, 0);
505 ret
= lttng_statedump_start(session
);
507 WRITE_ONCE(session
->active
, 0);
509 mutex_unlock(&sessions_mutex
);
513 int lttng_session_disable(struct lttng_kernel_session
*session
)
516 struct lttng_kernel_channel_buffer_private
*chan_priv
;
518 mutex_lock(&sessions_mutex
);
519 if (!session
->active
) {
523 WRITE_ONCE(session
->active
, 0);
525 /* Set transient enabler state to "disabled" */
526 session
->priv
->tstate
= 0;
527 lttng_session_sync_event_enablers(session
);
529 /* Set each stream's quiescent state. */
530 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
531 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
532 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
535 mutex_unlock(&sessions_mutex
);
539 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
542 struct lttng_kernel_channel_buffer_private
*chan_priv
;
543 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
544 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
545 struct lttng_metadata_stream
*stream
;
547 mutex_lock(&sessions_mutex
);
548 if (!session
->active
) {
553 mutex_lock(&cache
->lock
);
554 memset(cache
->data
, 0, cache
->cache_alloc
);
555 cache
->metadata_written
= 0;
557 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
558 stream
->metadata_out
= 0;
559 stream
->metadata_in
= 0;
561 mutex_unlock(&cache
->lock
);
563 session
->priv
->metadata_dumped
= 0;
564 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
565 chan_priv
->metadata_dumped
= 0;
568 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
569 event_recorder_priv
->metadata_dumped
= 0;
572 ret
= _lttng_session_metadata_statedump(session
);
575 mutex_unlock(&sessions_mutex
);
580 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
582 struct lttng_kernel_channel_buffer
*chan_buf
;
584 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
586 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
587 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
592 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
596 mutex_lock(&sessions_mutex
);
597 if (is_channel_buffer_metadata(channel
)) {
601 if (channel
->enabled
) {
605 /* Set transient enabler state to "enabled" */
606 channel
->priv
->tstate
= 1;
607 lttng_session_sync_event_enablers(channel
->session
);
608 /* Set atomically the state to "enabled" */
609 WRITE_ONCE(channel
->enabled
, 1);
611 mutex_unlock(&sessions_mutex
);
615 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
619 mutex_lock(&sessions_mutex
);
620 if (is_channel_buffer_metadata(channel
)) {
624 if (!channel
->enabled
) {
628 /* Set atomically the state to "disabled" */
629 WRITE_ONCE(channel
->enabled
, 0);
630 /* Set transient enabler state to "enabled" */
631 channel
->priv
->tstate
= 0;
632 lttng_session_sync_event_enablers(channel
->session
);
634 mutex_unlock(&sessions_mutex
);
638 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
642 mutex_lock(&sessions_mutex
);
643 switch (event
->type
) {
644 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
646 struct lttng_kernel_event_recorder
*event_recorder
=
647 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
649 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
655 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
656 switch (event
->priv
->instrumentation
) {
657 case LTTNG_KERNEL_ABI_KRETPROBE
:
668 if (event
->enabled
) {
672 switch (event
->priv
->instrumentation
) {
673 case LTTNG_KERNEL_ABI_TRACEPOINT
:
675 case LTTNG_KERNEL_ABI_SYSCALL
:
679 case LTTNG_KERNEL_ABI_KPROBE
:
681 case LTTNG_KERNEL_ABI_UPROBE
:
682 WRITE_ONCE(event
->enabled
, 1);
685 case LTTNG_KERNEL_ABI_KRETPROBE
:
686 ret
= lttng_kretprobes_event_enable_state(event
, 1);
689 case LTTNG_KERNEL_ABI_FUNCTION
:
691 case LTTNG_KERNEL_ABI_NOOP
:
698 mutex_unlock(&sessions_mutex
);
702 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
706 mutex_lock(&sessions_mutex
);
707 switch (event
->type
) {
708 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
710 struct lttng_kernel_event_recorder
*event_recorder
=
711 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
713 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
719 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
720 switch (event
->priv
->instrumentation
) {
721 case LTTNG_KERNEL_ABI_KRETPROBE
:
732 if (!event
->enabled
) {
736 switch (event
->priv
->instrumentation
) {
737 case LTTNG_KERNEL_ABI_TRACEPOINT
:
739 case LTTNG_KERNEL_ABI_SYSCALL
:
743 case LTTNG_KERNEL_ABI_KPROBE
:
745 case LTTNG_KERNEL_ABI_UPROBE
:
746 WRITE_ONCE(event
->enabled
, 0);
749 case LTTNG_KERNEL_ABI_KRETPROBE
:
750 ret
= lttng_kretprobes_event_enable_state(event
, 0);
753 case LTTNG_KERNEL_ABI_FUNCTION
:
755 case LTTNG_KERNEL_ABI_NOOP
:
762 mutex_unlock(&sessions_mutex
);
766 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
767 const char *transport_name
,
769 size_t subbuf_size
, size_t num_subbuf
,
770 unsigned int switch_timer_interval
,
771 unsigned int read_timer_interval
,
772 enum channel_type channel_type
)
774 struct lttng_kernel_channel_buffer
*chan
;
775 struct lttng_kernel_channel_buffer_private
*chan_priv
;
776 struct lttng_transport
*transport
= NULL
;
778 mutex_lock(&sessions_mutex
);
779 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
780 goto active
; /* Refuse to add channel to active session */
781 transport
= lttng_transport_find(transport_name
);
783 printk(KERN_WARNING
"LTTng: transport %s not found\n",
787 if (!try_module_get(transport
->owner
)) {
788 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
791 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
794 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
797 chan
->priv
= chan_priv
;
798 chan_priv
->pub
= chan
;
799 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
800 chan
->parent
.session
= session
;
801 chan
->priv
->id
= session
->priv
->free_chan_id
++;
802 chan
->ops
= &transport
->ops
;
804 * Note: the channel creation op already writes into the packet
805 * headers. Therefore the "chan" information used as input
806 * should be already accessible.
808 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
809 chan
, buf_addr
, subbuf_size
, num_subbuf
,
810 switch_timer_interval
, read_timer_interval
);
811 if (!chan
->priv
->rb_chan
)
813 chan
->priv
->parent
.tstate
= 1;
814 chan
->parent
.enabled
= 1;
815 chan
->priv
->transport
= transport
;
816 chan
->priv
->channel_type
= channel_type
;
817 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
818 mutex_unlock(&sessions_mutex
);
827 module_put(transport
->owner
);
830 mutex_unlock(&sessions_mutex
);
835 * Only used internally at session destruction for per-cpu channels, and
836 * when metadata channel is released.
837 * Needs to be called with sessions mutex held.
840 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
842 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
843 module_put(chan
->priv
->transport
->owner
);
844 list_del(&chan
->priv
->node
);
845 lttng_kernel_destroy_context(chan
->priv
->ctx
);
850 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
852 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
854 /* Protect the metadata cache with the sessions_mutex. */
855 mutex_lock(&sessions_mutex
);
856 _lttng_channel_destroy(chan
);
857 mutex_unlock(&sessions_mutex
);
859 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
862 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
864 stream
->finalized
= 1;
865 wake_up_interruptible(&stream
->read_wait
);
869 bool lttng_kernel_event_id_available(struct lttng_event_enabler_common
*event_enabler
)
871 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
872 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
874 switch (event_enabler
->enabler_type
) {
875 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
877 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
878 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
879 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
882 case LTTNG_KERNEL_ABI_TRACEPOINT
:
884 case LTTNG_KERNEL_ABI_KPROBE
:
886 case LTTNG_KERNEL_ABI_SYSCALL
:
888 case LTTNG_KERNEL_ABI_UPROBE
:
889 if (chan
->priv
->free_event_id
== -1U)
892 case LTTNG_KERNEL_ABI_KRETPROBE
:
893 /* kretprobes require 2 event IDs. */
894 if (chan
->priv
->free_event_id
>= -2U)
902 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
911 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
913 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
914 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
916 switch (event_enabler
->enabler_type
) {
917 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
919 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
920 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
921 struct lttng_kernel_event_recorder
*event_recorder
;
922 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
923 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
925 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
928 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
929 if (!event_recorder_priv
) {
930 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
933 event_recorder_priv
->pub
= event_recorder
;
934 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
935 event_recorder
->priv
= event_recorder_priv
;
936 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
938 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
939 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
940 event_recorder
->priv
->parent
.instrumentation
= itype
;
941 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
942 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
944 event_recorder
->chan
= chan
;
945 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
946 return &event_recorder
->parent
;
948 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
950 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
951 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
952 struct lttng_kernel_event_notifier
*event_notifier
;
953 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
955 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
958 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
959 if (!event_notifier_priv
) {
960 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
963 event_notifier_priv
->pub
= event_notifier
;
964 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
965 event_notifier
->priv
= event_notifier_priv
;
966 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
968 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
969 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
970 event_notifier
->priv
->parent
.instrumentation
= itype
;
971 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
972 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
973 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
975 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
976 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
977 event_notifier
->priv
->num_captures
= 0;
978 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
979 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
980 return &event_notifier
->parent
;
988 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
990 switch (event
->type
) {
991 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
993 struct lttng_kernel_event_recorder
*event_recorder
=
994 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
996 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
997 kmem_cache_free(event_recorder_cache
, event_recorder
);
1000 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1002 struct lttng_kernel_event_notifier
*event_notifier
=
1003 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1005 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1006 kmem_cache_free(event_notifier_cache
, event_notifier
);
1015 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
1017 switch (event
->type
) {
1018 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1020 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1022 struct lttng_kernel_event_notifier
*event_notifier
=
1023 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1024 struct lttng_counter
*error_counter
;
1025 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
1026 size_t dimension_index
[1];
1030 * Clear the error counter bucket. The sessiond keeps track of which
1031 * bucket is currently in use. We trust it. The session lock
1032 * synchronizes against concurrent creation of the error
1035 error_counter
= event_notifier_group
->error_counter
;
1039 * Check that the index is within the boundary of the counter.
1041 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1042 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1043 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1047 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1048 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1050 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1051 event_notifier
->priv
->error_counter_index
);
1062 * Supports event creation while tracing session is active.
1063 * Needs to be called with sessions mutex held.
1065 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1066 const struct lttng_kernel_event_desc
*event_desc
)
1068 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
1069 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
1070 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
1071 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1072 struct lttng_kernel_event_common_private
*event_priv
;
1073 struct lttng_kernel_event_common
*event
;
1074 const char *event_name
;
1075 struct hlist_head
*head
;
1078 if (!lttng_kernel_event_id_available(event_enabler
)) {
1084 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1085 event_name
= event_desc
->event_name
;
1088 case LTTNG_KERNEL_ABI_KPROBE
:
1090 case LTTNG_KERNEL_ABI_UPROBE
:
1092 case LTTNG_KERNEL_ABI_KRETPROBE
:
1094 case LTTNG_KERNEL_ABI_SYSCALL
:
1095 event_name
= event_param
->name
;
1098 case LTTNG_KERNEL_ABI_FUNCTION
:
1100 case LTTNG_KERNEL_ABI_NOOP
:
1108 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1109 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1110 if (lttng_event_enabler_event_name_match_event(event_enabler
, event_name
, event_priv
->pub
)) {
1116 event
= lttng_kernel_event_alloc(event_enabler
);
1123 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1124 /* Event will be enabled by enabler sync. */
1126 event
->priv
->registered
= 0;
1127 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1128 if (!event
->priv
->desc
) {
1130 goto register_error
;
1132 /* Populate lttng_event structure before event registration. */
1136 case LTTNG_KERNEL_ABI_KPROBE
:
1138 * Needs to be explicitly enabled after creation, since
1139 * we may want to apply filters.
1142 event
->priv
->registered
= 1;
1144 * Populate lttng_event structure before event
1148 ret
= lttng_kprobes_register_event(event_name
,
1149 event_param
->u
.kprobe
.symbol_name
,
1150 event_param
->u
.kprobe
.offset
,
1151 event_param
->u
.kprobe
.addr
,
1155 goto register_error
;
1157 ret
= try_module_get(event
->priv
->desc
->owner
);
1161 case LTTNG_KERNEL_ABI_KRETPROBE
:
1163 struct lttng_kernel_event_common
*event_return
;
1165 /* kretprobe defines 2 events */
1167 * Needs to be explicitly enabled after creation, since
1168 * we may want to apply filters.
1171 event
->priv
->registered
= 1;
1173 event_return
= lttng_kernel_event_alloc(event_enabler
);
1179 event_return
->enabled
= 0;
1180 event_return
->priv
->registered
= 1;
1183 * Populate lttng_event structure before kretprobe registration.
1186 ret
= lttng_kretprobes_register(event_name
,
1187 event_param
->u
.kretprobe
.symbol_name
,
1188 event_param
->u
.kretprobe
.offset
,
1189 event_param
->u
.kretprobe
.addr
,
1190 event
, event_return
);
1192 lttng_kernel_event_free(event_return
);
1194 goto register_error
;
1196 /* Take 2 refs on the module: one per event. */
1197 ret
= try_module_get(event
->priv
->desc
->owner
);
1199 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1201 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1202 WARN_ON_ONCE(ret
> 0);
1204 lttng_kernel_event_free(event_return
);
1205 module_put(event_return
->priv
->desc
->owner
);
1206 module_put(event
->priv
->desc
->owner
);
1207 goto statedump_error
;
1209 list_add(&event_return
->priv
->node
, event_list_head
);
1213 case LTTNG_KERNEL_ABI_SYSCALL
:
1215 * Needs to be explicitly enabled after creation, since
1216 * we may want to apply filters.
1219 event
->priv
->registered
= 0;
1220 event
->priv
->desc
= event_desc
;
1221 switch (event_param
->u
.syscall
.entryexit
) {
1222 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1224 goto register_error
;
1225 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1226 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1228 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1229 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1232 switch (event_param
->u
.syscall
.abi
) {
1233 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1235 goto register_error
;
1236 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1237 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1239 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1240 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1243 if (!event
->priv
->desc
) {
1245 goto register_error
;
1249 case LTTNG_KERNEL_ABI_UPROBE
:
1251 * Needs to be explicitly enabled after creation, since
1252 * we may want to apply filters.
1255 event
->priv
->registered
= 1;
1258 * Populate lttng_event structure before event
1263 ret
= lttng_uprobes_register_event(event_param
->name
,
1264 event_param
->u
.uprobe
.fd
,
1267 goto register_error
;
1268 ret
= try_module_get(event
->priv
->desc
->owner
);
1275 goto register_error
;
1278 ret
= _lttng_event_recorder_metadata_statedump(event
);
1279 WARN_ON_ONCE(ret
> 0);
1281 goto statedump_error
;
1284 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1286 goto register_error
;
1288 hlist_add_head(&event
->priv
->hlist_node
, head
);
1289 list_add(&event
->priv
->node
, event_list_head
);
1294 /* If a statedump error occurs, events will not be readable. */
1296 lttng_kernel_event_free(event
);
1301 return ERR_PTR(ret
);
1304 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1305 const struct lttng_kernel_event_desc
*event_desc
)
1307 struct lttng_kernel_event_common
*event
;
1309 mutex_lock(&sessions_mutex
);
1310 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1311 mutex_unlock(&sessions_mutex
);
1315 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1316 const size_t *dim_indexes
, int32_t cpu
,
1317 int64_t *val
, bool *overflow
, bool *underflow
)
1319 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1320 cpu
, val
, overflow
, underflow
);
1323 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1324 const size_t *dim_indexes
, int64_t *val
,
1325 bool *overflow
, bool *underflow
)
1327 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1328 val
, overflow
, underflow
);
1331 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1332 const size_t *dim_indexes
)
1334 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1337 /* Only used for tracepoints and system calls for now. */
1339 void register_event(struct lttng_kernel_event_common
*event
)
1341 const struct lttng_kernel_event_desc
*desc
;
1344 WARN_ON_ONCE(event
->priv
->registered
);
1346 desc
= event
->priv
->desc
;
1347 switch (event
->priv
->instrumentation
) {
1348 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1349 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1350 desc
->tp_class
->probe_callback
,
1354 case LTTNG_KERNEL_ABI_SYSCALL
:
1355 ret
= lttng_syscall_filter_enable_event(event
);
1358 case LTTNG_KERNEL_ABI_KPROBE
:
1360 case LTTNG_KERNEL_ABI_UPROBE
:
1364 case LTTNG_KERNEL_ABI_KRETPROBE
:
1365 switch (event
->type
) {
1366 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1369 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1375 case LTTNG_KERNEL_ABI_FUNCTION
:
1377 case LTTNG_KERNEL_ABI_NOOP
:
1384 event
->priv
->registered
= 1;
1388 void unregister_event(struct lttng_kernel_event_common
*event
)
1390 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1391 const struct lttng_kernel_event_desc
*desc
;
1394 WARN_ON_ONCE(!event
->priv
->registered
);
1396 desc
= event_priv
->desc
;
1397 switch (event_priv
->instrumentation
) {
1398 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1399 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1400 event_priv
->desc
->tp_class
->probe_callback
,
1404 case LTTNG_KERNEL_ABI_KPROBE
:
1405 lttng_kprobes_unregister_event(event
);
1409 case LTTNG_KERNEL_ABI_KRETPROBE
:
1410 switch (event
->type
) {
1411 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1412 lttng_kretprobes_unregister(event
);
1415 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1421 case LTTNG_KERNEL_ABI_SYSCALL
:
1422 ret
= lttng_syscall_filter_disable_event(event
);
1425 case LTTNG_KERNEL_ABI_NOOP
:
1426 switch (event
->type
) {
1427 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1430 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1436 case LTTNG_KERNEL_ABI_UPROBE
:
1437 lttng_uprobes_unregister_event(event
);
1441 case LTTNG_KERNEL_ABI_FUNCTION
:
1448 event_priv
->registered
= 0;
1452 void _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1454 if (event
->priv
->registered
)
1455 unregister_event(event
);
1459 * Only used internally at session destruction.
1462 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1464 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1465 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1467 lttng_free_event_filter_runtime(event
);
1468 /* Free event enabler refs */
1469 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1470 &event_priv
->enablers_ref_head
, node
)
1473 switch (event
->type
) {
1474 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1476 struct lttng_kernel_event_recorder
*event_recorder
=
1477 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1479 switch (event_priv
->instrumentation
) {
1480 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1481 lttng_event_desc_put(event_priv
->desc
);
1484 case LTTNG_KERNEL_ABI_KPROBE
:
1485 module_put(event_priv
->desc
->owner
);
1486 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1489 case LTTNG_KERNEL_ABI_KRETPROBE
:
1490 module_put(event_priv
->desc
->owner
);
1491 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1494 case LTTNG_KERNEL_ABI_SYSCALL
:
1497 case LTTNG_KERNEL_ABI_UPROBE
:
1498 module_put(event_priv
->desc
->owner
);
1499 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1502 case LTTNG_KERNEL_ABI_FUNCTION
:
1504 case LTTNG_KERNEL_ABI_NOOP
:
1509 list_del(&event_recorder
->priv
->parent
.node
);
1510 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1511 kmem_cache_free(event_recorder_cache
, event_recorder
);
1514 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1516 struct lttng_kernel_event_notifier
*event_notifier
=
1517 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1519 switch (event_notifier
->priv
->parent
.instrumentation
) {
1520 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1521 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1524 case LTTNG_KERNEL_ABI_KPROBE
:
1525 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1526 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1529 case LTTNG_KERNEL_ABI_SYSCALL
:
1532 case LTTNG_KERNEL_ABI_UPROBE
:
1533 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1534 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1537 case LTTNG_KERNEL_ABI_KRETPROBE
:
1539 case LTTNG_KERNEL_ABI_FUNCTION
:
1541 case LTTNG_KERNEL_ABI_NOOP
:
1546 list_del(&event_notifier
->priv
->parent
.node
);
1547 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1548 kmem_cache_free(event_notifier_cache
, event_notifier
);
1556 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1557 enum tracker_type tracker_type
)
1559 switch (tracker_type
) {
1561 return &session
->pid_tracker
;
1563 return &session
->vpid_tracker
;
1565 return &session
->uid_tracker
;
1567 return &session
->vuid_tracker
;
1569 return &session
->gid_tracker
;
1571 return &session
->vgid_tracker
;
1578 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1579 enum tracker_type tracker_type
, int id
)
1581 struct lttng_kernel_id_tracker
*tracker
;
1584 tracker
= get_tracker(session
, tracker_type
);
1589 mutex_lock(&sessions_mutex
);
1591 /* track all ids: destroy tracker. */
1592 lttng_id_tracker_destroy(tracker
, true);
1595 ret
= lttng_id_tracker_add(tracker
, id
);
1597 mutex_unlock(&sessions_mutex
);
1601 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1602 enum tracker_type tracker_type
, int id
)
1604 struct lttng_kernel_id_tracker
*tracker
;
1607 tracker
= get_tracker(session
, tracker_type
);
1612 mutex_lock(&sessions_mutex
);
1614 /* untrack all ids: replace by empty tracker. */
1615 ret
= lttng_id_tracker_empty_set(tracker
);
1617 ret
= lttng_id_tracker_del(tracker
, id
);
1619 mutex_unlock(&sessions_mutex
);
1624 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1626 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1627 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1628 struct lttng_id_hash_node
*e
;
1631 mutex_lock(&sessions_mutex
);
1633 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1634 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1636 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1642 /* ID tracker disabled. */
1643 if (iter
>= *pos
&& iter
== 0) {
1644 return id_tracker_p
; /* empty tracker */
1652 /* Called with sessions_mutex held. */
1654 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1656 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1657 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1658 struct lttng_id_hash_node
*e
;
1663 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1664 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1666 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1667 if (iter
++ >= *ppos
)
1672 /* ID tracker disabled. */
1673 if (iter
>= *ppos
&& iter
== 0)
1674 return p
; /* empty tracker */
1683 void id_list_stop(struct seq_file
*m
, void *p
)
1685 mutex_unlock(&sessions_mutex
);
1689 int id_list_show(struct seq_file
*m
, void *p
)
1691 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1692 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1695 if (p
== id_tracker_p
) {
1696 /* Tracker disabled. */
1699 const struct lttng_id_hash_node
*e
= p
;
1701 id
= lttng_id_tracker_get_node_id(e
);
1703 switch (id_tracker
->priv
->tracker_type
) {
1705 seq_printf(m
, "process { pid = %d; };\n", id
);
1708 seq_printf(m
, "process { vpid = %d; };\n", id
);
1711 seq_printf(m
, "user { uid = %d; };\n", id
);
1714 seq_printf(m
, "user { vuid = %d; };\n", id
);
1717 seq_printf(m
, "group { gid = %d; };\n", id
);
1720 seq_printf(m
, "group { vgid = %d; };\n", id
);
1723 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1729 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1730 .start
= id_list_start
,
1731 .next
= id_list_next
,
1732 .stop
= id_list_stop
,
1733 .show
= id_list_show
,
1737 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1739 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1743 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1745 struct seq_file
*m
= file
->private_data
;
1746 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1749 WARN_ON_ONCE(!id_tracker
);
1750 ret
= seq_release(inode
, file
);
1752 fput(id_tracker
->priv
->session
->priv
->file
);
1756 const struct file_operations lttng_tracker_ids_list_fops
= {
1757 .owner
= THIS_MODULE
,
1758 .open
= lttng_tracker_ids_list_open
,
1760 .llseek
= seq_lseek
,
1761 .release
= lttng_tracker_ids_list_release
,
1764 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1765 enum tracker_type tracker_type
)
1767 struct file
*tracker_ids_list_file
;
1771 file_fd
= get_unused_fd_flags(0);
1777 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1778 <tng_tracker_ids_list_fops
,
1780 if (IS_ERR(tracker_ids_list_file
)) {
1781 ret
= PTR_ERR(tracker_ids_list_file
);
1784 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1786 goto refcount_error
;
1788 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1791 m
= tracker_ids_list_file
->private_data
;
1793 m
->private = get_tracker(session
, tracker_type
);
1794 BUG_ON(!m
->private);
1795 fd_install(file_fd
, tracker_ids_list_file
);
1800 atomic_long_dec(&session
->priv
->file
->f_count
);
1802 fput(tracker_ids_list_file
);
1804 put_unused_fd(file_fd
);
1810 * Enabler management.
1813 int lttng_match_enabler_star_glob(const char *desc_name
,
1814 const char *pattern
)
1816 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1817 desc_name
, LTTNG_SIZE_MAX
))
1823 int lttng_match_enabler_name(const char *desc_name
,
1826 if (strcmp(desc_name
, name
))
1832 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1833 struct lttng_event_enabler_common
*enabler
)
1835 const char *desc_name
, *enabler_name
;
1836 bool compat
= false, entry
= false;
1838 enabler_name
= enabler
->event_param
.name
;
1839 switch (enabler
->event_param
.instrumentation
) {
1840 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1841 desc_name
= desc
->event_name
;
1842 switch (enabler
->format_type
) {
1843 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1844 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1845 case LTTNG_ENABLER_FORMAT_NAME
:
1846 return lttng_match_enabler_name(desc_name
, enabler_name
);
1852 case LTTNG_KERNEL_ABI_SYSCALL
:
1853 desc_name
= desc
->event_name
;
1854 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1855 desc_name
+= strlen("compat_");
1858 if (!strncmp(desc_name
, "syscall_exit_",
1859 strlen("syscall_exit_"))) {
1860 desc_name
+= strlen("syscall_exit_");
1861 } else if (!strncmp(desc_name
, "syscall_entry_",
1862 strlen("syscall_entry_"))) {
1863 desc_name
+= strlen("syscall_entry_");
1869 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1870 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1872 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1876 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1883 switch (enabler
->event_param
.u
.syscall
.abi
) {
1884 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1886 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1890 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1897 switch (enabler
->event_param
.u
.syscall
.match
) {
1898 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1899 switch (enabler
->format_type
) {
1900 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1901 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1902 case LTTNG_ENABLER_FORMAT_NAME
:
1903 return lttng_match_enabler_name(desc_name
, enabler_name
);
1908 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1909 return -EINVAL
; /* Not implemented. */
1921 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1922 struct lttng_event_enabler_common
*enabler
)
1926 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
1934 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
1935 struct lttng_kernel_event_common
*event
)
1937 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1940 switch (event_enabler
->enabler_type
) {
1941 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1943 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1944 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1945 struct lttng_kernel_event_recorder
*event_recorder
=
1946 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1948 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1949 && event_recorder
->chan
== event_recorder_enabler
->chan
)
1954 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1956 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1957 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1958 struct lttng_kernel_event_notifier
*event_notifier
=
1959 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1961 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1962 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1963 && event
->priv
->user_token
== event_enabler
->user_token
)
1974 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
1975 const struct lttng_kernel_event_desc
*desc
,
1976 struct lttng_kernel_event_common
*event
)
1978 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1981 switch (event_enabler
->enabler_type
) {
1982 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1984 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1985 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1986 struct lttng_kernel_event_recorder
*event_recorder
=
1987 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1989 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
1994 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1996 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1997 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1998 struct lttng_kernel_event_notifier
*event_notifier
=
1999 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2001 if (event
->priv
->desc
== desc
2002 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2003 && event
->priv
->user_token
== event_enabler
->user_token
)
2014 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2015 const char *event_name
,
2016 struct lttng_kernel_event_common
*event
)
2018 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2021 switch (event_enabler
->enabler_type
) {
2022 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2024 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2025 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2026 struct lttng_kernel_event_recorder
*event_recorder
=
2027 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2029 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2030 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2035 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2037 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2038 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2039 struct lttng_kernel_event_notifier
*event_notifier
=
2040 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2042 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2043 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2044 && event
->priv
->user_token
== event_enabler
->user_token
)
2056 struct lttng_enabler_ref
*lttng_enabler_ref(
2057 struct list_head
*enablers_ref_list
,
2058 struct lttng_event_enabler_common
*enabler
)
2060 struct lttng_enabler_ref
*enabler_ref
;
2062 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2063 if (enabler_ref
->ref
== enabler
)
2070 void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2072 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2073 struct lttng_kernel_probe_desc
*probe_desc
;
2074 const struct lttng_kernel_event_desc
*desc
;
2075 struct list_head
*probe_list
;
2078 probe_list
= lttng_get_probe_list_head();
2080 * For each probe event, if we find that a probe event matches
2081 * our enabler, create an associated lttng_event if not
2084 list_for_each_entry(probe_desc
, probe_list
, head
) {
2085 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2087 struct hlist_head
*head
;
2088 struct lttng_kernel_event_common
*event
;
2089 struct lttng_kernel_event_common_private
*event_priv
;
2091 desc
= probe_desc
->event_desc
[i
];
2092 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2096 * Check if already created.
2098 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2099 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2100 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
)) {
2109 * We need to create an event for this event probe.
2111 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2112 if (IS_ERR(event
)) {
2113 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2114 probe_desc
->event_desc
[i
]->event_name
);
2121 * Create event if it is missing and present in the list of tracepoint probes.
2122 * Should be called with sessions mutex held.
2125 void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2129 switch (event_enabler
->event_param
.instrumentation
) {
2130 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2131 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler
);
2134 case LTTNG_KERNEL_ABI_SYSCALL
:
2135 ret
= lttng_event_enabler_create_syscall_events_if_missing(event_enabler
);
2146 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2147 struct lttng_kernel_event_common
*event
)
2149 /* Link filter bytecodes if not linked yet. */
2150 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2151 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2155 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2156 struct lttng_kernel_event_common
*event
)
2158 switch (event_enabler
->enabler_type
) {
2159 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2161 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2163 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2164 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2165 struct lttng_kernel_event_notifier
*event_notifier
=
2166 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2168 /* Link capture bytecodes if not linked yet. */
2169 lttng_enabler_link_bytecode(event
->priv
->desc
,
2170 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2171 &event_notifier_enabler
->capture_bytecode_head
);
2172 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2181 * Create events associated with an event_enabler (if not already present),
2182 * and add backward reference from the event to the enabler.
2183 * Should be called with sessions mutex held.
2186 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2188 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2189 struct lttng_kernel_event_common_private
*event_priv
;
2191 lttng_syscall_table_set_wildcard_all(event_enabler
);
2193 /* First ensure that probe events are created for this enabler. */
2194 lttng_event_enabler_create_events_if_missing(event_enabler
);
2196 /* Link the created event with its associated enabler. */
2197 list_for_each_entry(event_priv
, event_list_head
, node
) {
2198 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2199 struct lttng_enabler_ref
*enabler_ref
;
2201 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2204 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2207 * If no backward ref, create it.
2208 * Add backward ref from event_notifier to enabler.
2210 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2214 enabler_ref
->ref
= event_enabler
;
2215 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2218 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2219 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2225 * Called at module load: connect the probe on all enablers matching
2227 * Called with sessions lock held.
2229 int lttng_fix_pending_events(void)
2231 struct lttng_kernel_session_private
*session_priv
;
2233 list_for_each_entry(session_priv
, &sessions
, list
)
2234 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2238 static bool lttng_event_notifier_group_has_active_event_notifiers(
2239 struct lttng_event_notifier_group
*event_notifier_group
)
2241 struct lttng_event_enabler_common
*event_enabler
;
2243 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2244 if (event_enabler
->enabled
)
2250 bool lttng_event_notifier_active(void)
2252 struct lttng_event_notifier_group
*event_notifier_group
;
2254 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2255 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2261 int lttng_fix_pending_event_notifiers(void)
2263 struct lttng_event_notifier_group
*event_notifier_group
;
2265 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2266 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2270 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2271 enum lttng_enabler_format_type format_type
,
2272 struct lttng_kernel_abi_event
*event_param
,
2273 struct lttng_kernel_channel_buffer
*chan
)
2275 struct lttng_event_recorder_enabler
*event_enabler
;
2277 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2280 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2281 event_enabler
->parent
.format_type
= format_type
;
2282 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2283 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2284 sizeof(event_enabler
->parent
.event_param
));
2285 event_enabler
->chan
= chan
;
2287 event_enabler
->parent
.enabled
= 0;
2288 return event_enabler
;
2291 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2292 struct lttng_event_recorder_enabler
*event_enabler
)
2294 mutex_lock(&sessions_mutex
);
2295 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2296 event_enabler
->parent
.published
= true;
2297 lttng_session_lazy_sync_event_enablers(session
);
2298 mutex_unlock(&sessions_mutex
);
2301 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2303 mutex_lock(&sessions_mutex
);
2304 event_enabler
->enabled
= 1;
2305 lttng_event_enabler_sync(event_enabler
);
2306 mutex_unlock(&sessions_mutex
);
2310 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2312 mutex_lock(&sessions_mutex
);
2313 event_enabler
->enabled
= 0;
2314 lttng_event_enabler_sync(event_enabler
);
2315 mutex_unlock(&sessions_mutex
);
2320 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2321 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2323 struct lttng_kernel_bytecode_node
*bytecode_node
;
2324 uint32_t bytecode_len
;
2327 ret
= get_user(bytecode_len
, &bytecode
->len
);
2330 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2334 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2335 sizeof(*bytecode
) + bytecode_len
);
2339 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2340 bytecode_node
->enabler
= enabler
;
2341 /* Enforce length based on allocated size */
2342 bytecode_node
->bc
.len
= bytecode_len
;
2343 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2348 lttng_kvfree(bytecode_node
);
2352 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2353 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2356 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2359 lttng_event_enabler_sync(event_enabler
);
2366 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2367 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2370 switch (event
->priv
->instrumentation
) {
2371 case LTTNG_KERNEL_ABI_UPROBE
:
2372 return lttng_uprobes_event_add_callsite(event
, callsite
);
2379 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2381 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2383 /* Destroy filter bytecode */
2384 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2385 &enabler
->filter_bytecode_head
, node
) {
2386 lttng_kvfree(filter_node
);
2390 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2392 lttng_enabler_destroy(event_enabler
);
2393 if (event_enabler
->published
)
2394 list_del(&event_enabler
->node
);
2396 switch (event_enabler
->enabler_type
) {
2397 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2399 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2400 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2402 kfree(event_recorder_enabler
);
2405 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2407 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2408 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2410 kfree(event_notifier_enabler
);
2418 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2419 enum lttng_enabler_format_type format_type
,
2420 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2421 struct lttng_event_notifier_group
*event_notifier_group
)
2423 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2425 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2426 if (!event_notifier_enabler
)
2429 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2430 event_notifier_enabler
->parent
.format_type
= format_type
;
2431 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2432 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2434 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2435 event_notifier_enabler
->num_captures
= 0;
2437 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2438 sizeof(event_notifier_enabler
->parent
.event_param
));
2440 event_notifier_enabler
->parent
.enabled
= 0;
2441 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2442 event_notifier_enabler
->group
= event_notifier_group
;
2443 return event_notifier_enabler
;
2446 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2447 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2449 mutex_lock(&sessions_mutex
);
2450 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2451 event_notifier_enabler
->parent
.published
= true;
2452 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2453 mutex_unlock(&sessions_mutex
);
2456 int lttng_event_notifier_enabler_enable(
2457 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2459 mutex_lock(&sessions_mutex
);
2460 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2461 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2462 mutex_unlock(&sessions_mutex
);
2466 int lttng_event_notifier_enabler_disable(
2467 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2469 mutex_lock(&sessions_mutex
);
2470 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2471 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2472 mutex_unlock(&sessions_mutex
);
2476 int lttng_event_notifier_enabler_attach_capture_bytecode(
2477 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2478 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2480 struct lttng_kernel_bytecode_node
*bytecode_node
;
2481 struct lttng_event_enabler_common
*enabler
=
2482 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2483 uint32_t bytecode_len
;
2486 ret
= get_user(bytecode_len
, &bytecode
->len
);
2490 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2495 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2496 sizeof(*bytecode
) + bytecode_len
);
2500 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2501 bytecode_node
->enabler
= enabler
;
2503 /* Enforce length based on allocated size */
2504 bytecode_node
->bc
.len
= bytecode_len
;
2505 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2507 event_notifier_enabler
->num_captures
++;
2509 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2513 lttng_kvfree(bytecode_node
);
2519 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2521 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2522 struct lttng_kernel_bytecode_runtime
*runtime
;
2523 struct lttng_enabler_ref
*enabler_ref
;
2525 /* Check if has enablers without bytecode enabled */
2526 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2527 if (enabler_ref
->ref
->enabled
2528 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2529 has_enablers_without_filter_bytecode
= 1;
2533 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2535 /* Enable filters */
2536 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2537 lttng_bytecode_sync_state(runtime
);
2540 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2544 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2546 switch (event
->type
) {
2547 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2549 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2551 struct lttng_kernel_event_notifier
*event_notifier
=
2552 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2553 struct lttng_kernel_bytecode_runtime
*runtime
;
2554 int nr_captures
= 0;
2556 /* Enable captures */
2557 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2558 lttng_bytecode_sync_state(runtime
);
2561 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2570 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2572 struct lttng_enabler_ref
*enabler_ref
;
2573 bool enabled
= false;
2575 switch (event
->priv
->instrumentation
) {
2576 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2578 case LTTNG_KERNEL_ABI_SYSCALL
:
2580 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2581 if (enabler_ref
->ref
->enabled
) {
2592 switch (event
->type
) {
2593 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2595 struct lttng_kernel_event_recorder
*event_recorder
=
2596 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2599 * Enabled state is based on union of enablers, with
2600 * intersection of session and channel transient enable
2603 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2605 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2614 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2616 switch (event
->priv
->instrumentation
) {
2617 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2619 case LTTNG_KERNEL_ABI_SYSCALL
:
2623 /* Not handled with lazy sync. */
2629 * Should be called with sessions mutex held.
2632 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2633 struct list_head
*event_list
)
2635 struct lttng_kernel_event_common_private
*event_priv
;
2636 struct lttng_event_enabler_common
*event_enabler
;
2638 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2639 lttng_event_enabler_ref_events(event_enabler
);
2642 * For each event, if at least one of its enablers is enabled,
2643 * and its channel and session transient states are enabled, we
2644 * enable the event, else we disable it.
2646 list_for_each_entry(event_priv
, event_list
, node
) {
2647 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2650 if (!lttng_event_is_lazy_sync(event
))
2653 enabled
= lttng_get_event_enabled_state(event
);
2654 WRITE_ONCE(event
->enabled
, enabled
);
2656 * Sync tracepoint registration with event enabled state.
2659 if (!event_priv
->registered
)
2660 register_event(event
);
2662 if (event_priv
->registered
)
2663 unregister_event(event
);
2666 lttng_event_sync_filter_state(event
);
2667 lttng_event_sync_capture_state(event
);
2672 * lttng_session_sync_event_enablers should be called just before starting a
2676 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2678 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2682 * Apply enablers to session events, adding events to session if need
2683 * be. It is required after each modification applied to an active
2684 * session, and right before session "start".
2685 * "lazy" sync means we only sync if required.
2686 * Should be called with sessions mutex held.
2689 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2691 /* We can skip if session is not active */
2692 if (!session
->active
)
2694 lttng_session_sync_event_enablers(session
);
2698 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2700 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2704 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2706 switch (event_enabler
->enabler_type
) {
2707 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2709 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2710 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2711 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2714 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2716 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2717 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2718 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2727 * Serialize at most one packet worth of metadata into a metadata
2729 * We grab the metadata cache mutex to get exclusive access to our metadata
2730 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2731 * allows us to do racy operations such as looking for remaining space left in
2732 * packet and write, since mutual exclusion protects us from concurrent writes.
2733 * Mutual exclusion on the metadata cache allow us to read the cache content
2734 * without racing against reallocation of the cache by updates.
2735 * Returns the number of bytes written in the channel, 0 if no data
2736 * was written and a negative value on error.
2738 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2739 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2741 struct lttng_kernel_ring_buffer_ctx ctx
;
2743 size_t len
, reserve_len
;
2746 * Ensure we support mutiple get_next / put sequences followed by
2747 * put_next. The metadata cache lock protects reading the metadata
2748 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2749 * "flush" operations on the buffer invoked by different processes.
2750 * Moreover, since the metadata cache memory can be reallocated, we
2751 * need to have exclusive access against updates even though we only
2754 mutex_lock(&stream
->metadata_cache
->lock
);
2755 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2756 if (stream
->metadata_in
!= stream
->metadata_out
)
2759 /* Metadata regenerated, change the version. */
2760 if (stream
->metadata_cache
->version
!= stream
->version
)
2761 stream
->version
= stream
->metadata_cache
->version
;
2763 len
= stream
->metadata_cache
->metadata_written
-
2764 stream
->metadata_in
;
2767 reserve_len
= min_t(size_t,
2768 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2770 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2771 sizeof(char), NULL
);
2773 * If reservation failed, return an error to the caller.
2775 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2777 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2778 stream
->coherent
= false;
2781 stream
->transport
->ops
.event_write(&ctx
,
2782 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2784 stream
->transport
->ops
.event_commit(&ctx
);
2785 stream
->metadata_in
+= reserve_len
;
2786 if (reserve_len
< len
)
2787 stream
->coherent
= false;
2789 stream
->coherent
= true;
2794 *coherent
= stream
->coherent
;
2795 mutex_unlock(&stream
->metadata_cache
->lock
);
2800 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2802 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2803 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2807 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2809 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2810 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2811 struct lttng_metadata_stream
*stream
;
2813 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2814 wake_up_interruptible(&stream
->read_wait
);
2815 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2820 * Write the metadata to the metadata cache.
2821 * Must be called with sessions_mutex held.
2822 * The metadata cache lock protects us from concurrent read access from
2823 * thread outputting metadata content to ring buffer.
2824 * The content of the printf is printed as a single atomic metadata
2827 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2828 const char *fmt
, ...)
2834 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2837 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2843 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2844 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2845 session
->priv
->metadata_cache
->cache_alloc
) {
2846 char *tmp_cache_realloc
;
2847 unsigned int tmp_cache_alloc_size
;
2849 tmp_cache_alloc_size
= max_t(unsigned int,
2850 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2851 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2852 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2853 if (!tmp_cache_realloc
)
2855 if (session
->priv
->metadata_cache
->data
) {
2856 memcpy(tmp_cache_realloc
,
2857 session
->priv
->metadata_cache
->data
,
2858 session
->priv
->metadata_cache
->cache_alloc
);
2859 vfree(session
->priv
->metadata_cache
->data
);
2862 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2863 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2865 memcpy(session
->priv
->metadata_cache
->data
+
2866 session
->priv
->metadata_cache
->metadata_written
,
2868 session
->priv
->metadata_cache
->metadata_written
+= len
;
2879 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2883 for (i
= 0; i
< nesting
; i
++) {
2886 ret
= lttng_metadata_printf(session
, " ");
2895 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2896 const struct lttng_kernel_event_field
*field
,
2899 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2903 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2904 const struct lttng_kernel_type_integer
*type
,
2905 enum lttng_kernel_string_encoding parent_encoding
,
2910 ret
= print_tabs(session
, nesting
);
2913 ret
= lttng_metadata_printf(session
,
2914 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2918 (parent_encoding
== lttng_kernel_string_encoding_none
)
2920 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
2924 #if __BYTE_ORDER == __BIG_ENDIAN
2925 type
->reverse_byte_order
? " byte_order = le;" : ""
2927 type
->reverse_byte_order
? " byte_order = be;" : ""
2934 * Must be called with sessions_mutex held.
2937 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
2938 const struct lttng_kernel_type_struct
*type
,
2941 const char *prev_field_name
= NULL
;
2943 uint32_t i
, nr_fields
;
2944 unsigned int alignment
;
2946 ret
= print_tabs(session
, nesting
);
2949 ret
= lttng_metadata_printf(session
,
2953 nr_fields
= type
->nr_fields
;
2954 for (i
= 0; i
< nr_fields
; i
++) {
2955 const struct lttng_kernel_event_field
*iter_field
;
2957 iter_field
= type
->fields
[i
];
2958 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
2962 ret
= print_tabs(session
, nesting
);
2965 alignment
= type
->alignment
;
2967 ret
= lttng_metadata_printf(session
,
2971 ret
= lttng_metadata_printf(session
,
2978 * Must be called with sessions_mutex held.
2981 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
2982 const struct lttng_kernel_event_field
*field
,
2987 ret
= _lttng_struct_type_statedump(session
,
2988 lttng_kernel_get_type_struct(field
->type
), nesting
);
2991 return lttng_field_name_statedump(session
, field
, nesting
);
2995 * Must be called with sessions_mutex held.
2998 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
2999 const struct lttng_kernel_type_variant
*type
,
3001 const char *prev_field_name
)
3003 const char *tag_name
;
3005 uint32_t i
, nr_choices
;
3007 tag_name
= type
->tag_name
;
3009 tag_name
= prev_field_name
;
3013 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3015 if (type
->alignment
!= 0)
3017 ret
= print_tabs(session
, nesting
);
3020 ret
= lttng_metadata_printf(session
,
3021 "variant <_%s> {\n",
3025 nr_choices
= type
->nr_choices
;
3026 for (i
= 0; i
< nr_choices
; i
++) {
3027 const struct lttng_kernel_event_field
*iter_field
;
3029 iter_field
= type
->choices
[i
];
3030 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3034 ret
= print_tabs(session
, nesting
);
3037 ret
= lttng_metadata_printf(session
,
3043 * Must be called with sessions_mutex held.
3046 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3047 const struct lttng_kernel_event_field
*field
,
3049 const char *prev_field_name
)
3053 ret
= _lttng_variant_type_statedump(session
,
3054 lttng_kernel_get_type_variant(field
->type
), nesting
,
3058 return lttng_field_name_statedump(session
, field
, nesting
);
3062 * Must be called with sessions_mutex held.
3065 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3066 const struct lttng_kernel_event_field
*field
,
3070 const struct lttng_kernel_type_array
*array_type
;
3071 const struct lttng_kernel_type_common
*elem_type
;
3073 array_type
= lttng_kernel_get_type_array(field
->type
);
3074 WARN_ON_ONCE(!array_type
);
3076 if (array_type
->alignment
) {
3077 ret
= print_tabs(session
, nesting
);
3080 ret
= lttng_metadata_printf(session
,
3081 "struct { } align(%u) _%s_padding;\n",
3082 array_type
->alignment
* CHAR_BIT
,
3088 * Nested compound types: Only array of structures and variants are
3089 * currently supported.
3091 elem_type
= array_type
->elem_type
;
3092 switch (elem_type
->type
) {
3093 case lttng_kernel_type_integer
:
3094 case lttng_kernel_type_struct
:
3095 case lttng_kernel_type_variant
:
3096 ret
= _lttng_type_statedump(session
, elem_type
,
3097 array_type
->encoding
, nesting
);
3105 ret
= lttng_metadata_printf(session
,
3108 array_type
->length
);
3113 * Must be called with sessions_mutex held.
3116 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3117 const struct lttng_kernel_event_field
*field
,
3119 const char *prev_field_name
)
3122 const char *length_name
;
3123 const struct lttng_kernel_type_sequence
*sequence_type
;
3124 const struct lttng_kernel_type_common
*elem_type
;
3126 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3127 WARN_ON_ONCE(!sequence_type
);
3129 length_name
= sequence_type
->length_name
;
3131 length_name
= prev_field_name
;
3135 if (sequence_type
->alignment
) {
3136 ret
= print_tabs(session
, nesting
);
3139 ret
= lttng_metadata_printf(session
,
3140 "struct { } align(%u) _%s_padding;\n",
3141 sequence_type
->alignment
* CHAR_BIT
,
3148 * Nested compound types: Only array of structures and variants are
3149 * currently supported.
3151 elem_type
= sequence_type
->elem_type
;
3152 switch (elem_type
->type
) {
3153 case lttng_kernel_type_integer
:
3154 case lttng_kernel_type_struct
:
3155 case lttng_kernel_type_variant
:
3156 ret
= _lttng_type_statedump(session
, elem_type
,
3157 sequence_type
->encoding
, nesting
);
3165 ret
= lttng_metadata_printf(session
,
3173 * Must be called with sessions_mutex held.
3176 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3177 const struct lttng_kernel_type_enum
*type
,
3180 const struct lttng_kernel_enum_desc
*enum_desc
;
3181 const struct lttng_kernel_type_common
*container_type
;
3183 unsigned int i
, nr_entries
;
3185 container_type
= type
->container_type
;
3186 if (container_type
->type
!= lttng_kernel_type_integer
) {
3190 enum_desc
= type
->desc
;
3191 nr_entries
= enum_desc
->nr_entries
;
3193 ret
= print_tabs(session
, nesting
);
3196 ret
= lttng_metadata_printf(session
, "enum : ");
3199 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3200 lttng_kernel_string_encoding_none
, 0);
3203 ret
= lttng_metadata_printf(session
, " {\n");
3206 /* Dump all entries */
3207 for (i
= 0; i
< nr_entries
; i
++) {
3208 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3211 ret
= print_tabs(session
, nesting
+ 1);
3214 ret
= lttng_metadata_printf(session
,
3218 len
= strlen(entry
->string
);
3219 /* Escape the character '"' */
3220 for (j
= 0; j
< len
; j
++) {
3221 char c
= entry
->string
[j
];
3225 ret
= lttng_metadata_printf(session
,
3229 ret
= lttng_metadata_printf(session
,
3233 ret
= lttng_metadata_printf(session
,
3240 ret
= lttng_metadata_printf(session
, "\"");
3244 if (entry
->options
.is_auto
) {
3245 ret
= lttng_metadata_printf(session
, ",\n");
3249 ret
= lttng_metadata_printf(session
,
3253 if (entry
->start
.signedness
)
3254 ret
= lttng_metadata_printf(session
,
3255 "%lld", (long long) entry
->start
.value
);
3257 ret
= lttng_metadata_printf(session
,
3258 "%llu", entry
->start
.value
);
3261 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3263 == entry
->end
.value
) {
3264 ret
= lttng_metadata_printf(session
,
3267 if (entry
->end
.signedness
) {
3268 ret
= lttng_metadata_printf(session
,
3270 (long long) entry
->end
.value
);
3272 ret
= lttng_metadata_printf(session
,
3281 ret
= print_tabs(session
, nesting
);
3284 ret
= lttng_metadata_printf(session
, "}");
3290 * Must be called with sessions_mutex held.
3293 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3294 const struct lttng_kernel_event_field
*field
,
3298 const struct lttng_kernel_type_enum
*enum_type
;
3300 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3301 WARN_ON_ONCE(!enum_type
);
3302 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3305 return lttng_field_name_statedump(session
, field
, nesting
);
3309 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3310 const struct lttng_kernel_event_field
*field
,
3315 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3316 lttng_kernel_string_encoding_none
, nesting
);
3319 return lttng_field_name_statedump(session
, field
, nesting
);
3323 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3324 const struct lttng_kernel_type_string
*type
,
3329 /* Default encoding is UTF8 */
3330 ret
= print_tabs(session
, nesting
);
3333 ret
= lttng_metadata_printf(session
,
3335 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3336 " { encoding = ASCII; }" : "");
3341 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3342 const struct lttng_kernel_event_field
*field
,
3345 const struct lttng_kernel_type_string
*string_type
;
3348 string_type
= lttng_kernel_get_type_string(field
->type
);
3349 WARN_ON_ONCE(!string_type
);
3350 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3353 return lttng_field_name_statedump(session
, field
, nesting
);
3357 * Must be called with sessions_mutex held.
3360 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3361 const struct lttng_kernel_type_common
*type
,
3362 enum lttng_kernel_string_encoding parent_encoding
,
3367 switch (type
->type
) {
3368 case lttng_kernel_type_integer
:
3369 ret
= _lttng_integer_type_statedump(session
,
3370 lttng_kernel_get_type_integer(type
),
3371 parent_encoding
, nesting
);
3373 case lttng_kernel_type_enum
:
3374 ret
= _lttng_enum_type_statedump(session
,
3375 lttng_kernel_get_type_enum(type
),
3378 case lttng_kernel_type_string
:
3379 ret
= _lttng_string_type_statedump(session
,
3380 lttng_kernel_get_type_string(type
),
3383 case lttng_kernel_type_struct
:
3384 ret
= _lttng_struct_type_statedump(session
,
3385 lttng_kernel_get_type_struct(type
),
3388 case lttng_kernel_type_variant
:
3389 ret
= _lttng_variant_type_statedump(session
,
3390 lttng_kernel_get_type_variant(type
),
3394 /* Nested arrays and sequences are not supported yet. */
3395 case lttng_kernel_type_array
:
3396 case lttng_kernel_type_sequence
:
3405 * Must be called with sessions_mutex held.
3408 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3409 const struct lttng_kernel_event_field
*field
,
3411 const char **prev_field_name_p
)
3413 const char *prev_field_name
= NULL
;
3416 if (prev_field_name_p
)
3417 prev_field_name
= *prev_field_name_p
;
3418 switch (field
->type
->type
) {
3419 case lttng_kernel_type_integer
:
3420 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3422 case lttng_kernel_type_enum
:
3423 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3425 case lttng_kernel_type_string
:
3426 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3428 case lttng_kernel_type_struct
:
3429 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3431 case lttng_kernel_type_array
:
3432 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3434 case lttng_kernel_type_sequence
:
3435 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3437 case lttng_kernel_type_variant
:
3438 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3445 if (prev_field_name_p
)
3446 *prev_field_name_p
= field
->name
;
3451 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3452 struct lttng_kernel_ctx
*ctx
)
3454 const char *prev_field_name
= NULL
;
3460 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3461 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3463 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3471 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3472 struct lttng_kernel_event_recorder
*event_recorder
)
3474 const char *prev_field_name
= NULL
;
3475 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3479 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3480 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3482 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3490 * Must be called with sessions_mutex held.
3491 * The entire event metadata is printed as a single atomic metadata
3495 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3497 struct lttng_kernel_event_recorder
*event_recorder
;
3498 struct lttng_kernel_channel_buffer
*chan
;
3499 struct lttng_kernel_session
*session
;
3502 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3504 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3505 chan
= event_recorder
->chan
;
3506 session
= chan
->parent
.session
;
3508 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3510 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3513 lttng_metadata_begin(session
);
3515 ret
= lttng_metadata_printf(session
,
3519 " stream_id = %u;\n",
3520 event_recorder
->priv
->parent
.desc
->event_name
,
3521 event_recorder
->priv
->id
,
3522 event_recorder
->chan
->priv
->id
);
3526 ret
= lttng_metadata_printf(session
,
3527 " fields := struct {\n"
3532 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3537 * LTTng space reservation can only reserve multiples of the
3540 ret
= lttng_metadata_printf(session
,
3546 event_recorder
->priv
->metadata_dumped
= 1;
3548 lttng_metadata_end(session
);
3554 * Must be called with sessions_mutex held.
3555 * The entire channel metadata is printed as a single atomic metadata
3559 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3560 struct lttng_kernel_channel_buffer
*chan
)
3564 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3567 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3570 lttng_metadata_begin(session
);
3572 WARN_ON_ONCE(!chan
->priv
->header_type
);
3573 ret
= lttng_metadata_printf(session
,
3576 " event.header := %s;\n"
3577 " packet.context := struct packet_context;\n",
3579 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3580 "struct event_header_large");
3584 if (chan
->priv
->ctx
) {
3585 ret
= lttng_metadata_printf(session
,
3586 " event.context := struct {\n");
3590 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3593 if (chan
->priv
->ctx
) {
3594 ret
= lttng_metadata_printf(session
,
3600 ret
= lttng_metadata_printf(session
,
3603 chan
->priv
->metadata_dumped
= 1;
3605 lttng_metadata_end(session
);
3610 * Must be called with sessions_mutex held.
3613 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3615 return lttng_metadata_printf(session
,
3616 "struct packet_context {\n"
3617 " uint64_clock_monotonic_t timestamp_begin;\n"
3618 " uint64_clock_monotonic_t timestamp_end;\n"
3619 " uint64_t content_size;\n"
3620 " uint64_t packet_size;\n"
3621 " uint64_t packet_seq_num;\n"
3622 " unsigned long events_discarded;\n"
3623 " uint32_t cpu_id;\n"
3630 * id: range: 0 - 30.
3631 * id 31 is reserved to indicate an extended header.
3634 * id: range: 0 - 65534.
3635 * id 65535 is reserved to indicate an extended header.
3637 * Must be called with sessions_mutex held.
3640 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3642 return lttng_metadata_printf(session
,
3643 "struct event_header_compact {\n"
3644 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3647 " uint27_clock_monotonic_t timestamp;\n"
3651 " uint64_clock_monotonic_t timestamp;\n"
3656 "struct event_header_large {\n"
3657 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3660 " uint32_clock_monotonic_t timestamp;\n"
3664 " uint64_clock_monotonic_t timestamp;\n"
3668 lttng_alignof(uint32_t) * CHAR_BIT
,
3669 lttng_alignof(uint16_t) * CHAR_BIT
3674 * Approximation of NTP time of day to clock monotonic correlation,
3675 * taken at start of trace.
3676 * Yes, this is only an approximation. Yes, we can (and will) do better
3677 * in future versions.
3678 * This function may return a negative offset. It may happen if the
3679 * system sets the REALTIME clock to 0 after boot.
3681 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3685 int64_t measure_clock_offset(void)
3687 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3688 uint64_t tcf
= trace_clock_freq();
3690 unsigned long flags
;
3691 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3692 struct timespec64 rts
= { 0, 0 };
3694 struct timespec rts
= { 0, 0 };
3697 /* Disable interrupts to increase correlation precision. */
3698 local_irq_save(flags
);
3699 monotonic
[0] = trace_clock_read64();
3700 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3701 ktime_get_real_ts64(&rts
);
3703 getnstimeofday(&rts
);
3705 monotonic
[1] = trace_clock_read64();
3706 local_irq_restore(flags
);
3708 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3709 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3710 if (tcf
== NSEC_PER_SEC
) {
3711 realtime
+= rts
.tv_nsec
;
3713 uint64_t n
= rts
.tv_nsec
* tcf
;
3715 do_div(n
, NSEC_PER_SEC
);
3718 offset
= (int64_t) realtime
- monotonic_avg
;
3723 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3731 while (cur
!= '\0') {
3734 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3738 ret
= lttng_metadata_printf(session
, "%c", '\\');
3741 /* We still print the current char */
3744 ret
= lttng_metadata_printf(session
, "%c", cur
);
3758 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3759 const char *field_value
)
3763 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3767 ret
= print_escaped_ctf_string(session
, field_value
);
3771 ret
= lttng_metadata_printf(session
, "\";\n");
3778 * Output metadata into this session's metadata buffers.
3779 * Must be called with sessions_mutex held.
3782 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3784 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3785 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3786 const char *product_uuid
;
3787 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3788 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3791 if (!LTTNG_READ_ONCE(session
->active
))
3794 lttng_metadata_begin(session
);
3796 if (session
->priv
->metadata_dumped
)
3799 snprintf(uuid_s
, sizeof(uuid_s
),
3800 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3801 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3802 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3803 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3804 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3806 ret
= lttng_metadata_printf(session
,
3807 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3808 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3809 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3810 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3811 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3812 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3813 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3819 " byte_order = %s;\n"
3820 " packet.header := struct {\n"
3821 " uint32_t magic;\n"
3822 " uint8_t uuid[16];\n"
3823 " uint32_t stream_id;\n"
3824 " uint64_t stream_instance_id;\n"
3827 lttng_alignof(uint8_t) * CHAR_BIT
,
3828 lttng_alignof(uint16_t) * CHAR_BIT
,
3829 lttng_alignof(uint32_t) * CHAR_BIT
,
3830 lttng_alignof(uint64_t) * CHAR_BIT
,
3831 sizeof(unsigned long) * CHAR_BIT
,
3832 lttng_alignof(unsigned long) * CHAR_BIT
,
3836 #if __BYTE_ORDER == __BIG_ENDIAN
3845 ret
= lttng_metadata_printf(session
,
3847 " hostname = \"%s\";\n"
3848 " domain = \"kernel\";\n"
3849 " sysname = \"%s\";\n"
3850 " kernel_release = \"%s\";\n"
3851 " kernel_version = \"%s\";\n"
3852 " tracer_name = \"lttng-modules\";\n"
3853 " tracer_major = %d;\n"
3854 " tracer_minor = %d;\n"
3855 " tracer_patchlevel = %d;\n"
3856 " trace_buffering_scheme = \"global\";\n",
3857 current
->nsproxy
->uts_ns
->name
.nodename
,
3861 LTTNG_MODULES_MAJOR_VERSION
,
3862 LTTNG_MODULES_MINOR_VERSION
,
3863 LTTNG_MODULES_PATCHLEVEL_VERSION
3868 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3871 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3872 session
->priv
->creation_time
);
3876 /* Add the product UUID to the 'env' section */
3877 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3879 ret
= lttng_metadata_printf(session
,
3880 " product_uuid = \"%s\";\n",
3887 /* Close the 'env' section */
3888 ret
= lttng_metadata_printf(session
, "};\n\n");
3892 ret
= lttng_metadata_printf(session
,
3894 " name = \"%s\";\n",
3900 if (!trace_clock_uuid(clock_uuid_s
)) {
3901 ret
= lttng_metadata_printf(session
,
3902 " uuid = \"%s\";\n",
3909 ret
= lttng_metadata_printf(session
,
3910 " description = \"%s\";\n"
3911 " freq = %llu; /* Frequency, in Hz */\n"
3912 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3915 trace_clock_description(),
3916 (unsigned long long) trace_clock_freq(),
3917 (long long) measure_clock_offset()
3922 ret
= lttng_metadata_printf(session
,
3923 "typealias integer {\n"
3924 " size = 27; align = 1; signed = false;\n"
3925 " map = clock.%s.value;\n"
3926 "} := uint27_clock_monotonic_t;\n"
3928 "typealias integer {\n"
3929 " size = 32; align = %u; signed = false;\n"
3930 " map = clock.%s.value;\n"
3931 "} := uint32_clock_monotonic_t;\n"
3933 "typealias integer {\n"
3934 " size = 64; align = %u; signed = false;\n"
3935 " map = clock.%s.value;\n"
3936 "} := uint64_clock_monotonic_t;\n\n",
3938 lttng_alignof(uint32_t) * CHAR_BIT
,
3940 lttng_alignof(uint64_t) * CHAR_BIT
,
3946 ret
= _lttng_stream_packet_context_declare(session
);
3950 ret
= _lttng_event_header_declare(session
);
3955 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
3956 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
3961 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
3962 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
3966 session
->priv
->metadata_dumped
= 1;
3968 lttng_metadata_end(session
);
3973 * lttng_transport_register - LTT transport registration
3974 * @transport: transport structure
3976 * Registers a transport which can be used as output to extract the data out of
3977 * LTTng. The module calling this registration function must ensure that no
3978 * trap-inducing code will be executed by the transport functions. E.g.
3979 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3980 * is made visible to the transport function. This registration acts as a
3981 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3982 * after its registration must it synchronize the TLBs.
3984 void lttng_transport_register(struct lttng_transport
*transport
)
3987 * Make sure no page fault can be triggered by the module about to be
3988 * registered. We deal with this here so we don't have to call
3989 * vmalloc_sync_mappings() in each module's init.
3991 wrapper_vmalloc_sync_mappings();
3993 mutex_lock(&sessions_mutex
);
3994 list_add_tail(&transport
->node
, <tng_transport_list
);
3995 mutex_unlock(&sessions_mutex
);
3997 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4000 * lttng_transport_unregister - LTT transport unregistration
4001 * @transport: transport structure
4003 void lttng_transport_unregister(struct lttng_transport
*transport
)
4005 mutex_lock(&sessions_mutex
);
4006 list_del(&transport
->node
);
4007 mutex_unlock(&sessions_mutex
);
4009 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4011 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4014 * Make sure no page fault can be triggered by the module about to be
4015 * registered. We deal with this here so we don't have to call
4016 * vmalloc_sync_mappings() in each module's init.
4018 wrapper_vmalloc_sync_mappings();
4020 mutex_lock(&sessions_mutex
);
4021 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4022 mutex_unlock(&sessions_mutex
);
4024 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4026 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4028 mutex_lock(&sessions_mutex
);
4029 list_del(&transport
->node
);
4030 mutex_unlock(&sessions_mutex
);
4032 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4034 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4036 enum cpuhp_state lttng_hp_prepare
;
4037 enum cpuhp_state lttng_hp_online
;
4039 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4041 struct lttng_cpuhp_node
*lttng_node
;
4043 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4044 switch (lttng_node
->component
) {
4045 case LTTNG_RING_BUFFER_FRONTEND
:
4047 case LTTNG_RING_BUFFER_BACKEND
:
4048 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4049 case LTTNG_RING_BUFFER_ITER
:
4051 case LTTNG_CONTEXT_PERF_COUNTERS
:
4058 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4060 struct lttng_cpuhp_node
*lttng_node
;
4062 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4063 switch (lttng_node
->component
) {
4064 case LTTNG_RING_BUFFER_FRONTEND
:
4065 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4066 case LTTNG_RING_BUFFER_BACKEND
:
4068 case LTTNG_RING_BUFFER_ITER
:
4070 case LTTNG_CONTEXT_PERF_COUNTERS
:
4071 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4077 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4079 struct lttng_cpuhp_node
*lttng_node
;
4081 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4082 switch (lttng_node
->component
) {
4083 case LTTNG_RING_BUFFER_FRONTEND
:
4084 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4085 case LTTNG_RING_BUFFER_BACKEND
:
4087 case LTTNG_RING_BUFFER_ITER
:
4088 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4089 case LTTNG_CONTEXT_PERF_COUNTERS
:
4090 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4096 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4098 struct lttng_cpuhp_node
*lttng_node
;
4100 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4101 switch (lttng_node
->component
) {
4102 case LTTNG_RING_BUFFER_FRONTEND
:
4103 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4104 case LTTNG_RING_BUFFER_BACKEND
:
4106 case LTTNG_RING_BUFFER_ITER
:
4108 case LTTNG_CONTEXT_PERF_COUNTERS
:
4115 static int __init
lttng_init_cpu_hotplug(void)
4119 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4120 lttng_hotplug_prepare
,
4121 lttng_hotplug_dead
);
4125 lttng_hp_prepare
= ret
;
4126 lttng_rb_set_hp_prepare(ret
);
4128 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4129 lttng_hotplug_online
,
4130 lttng_hotplug_offline
);
4132 cpuhp_remove_multi_state(lttng_hp_prepare
);
4133 lttng_hp_prepare
= 0;
4136 lttng_hp_online
= ret
;
4137 lttng_rb_set_hp_online(ret
);
4142 static void __exit
lttng_exit_cpu_hotplug(void)
4144 lttng_rb_set_hp_online(0);
4145 cpuhp_remove_multi_state(lttng_hp_online
);
4146 lttng_rb_set_hp_prepare(0);
4147 cpuhp_remove_multi_state(lttng_hp_prepare
);
4150 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4151 static int lttng_init_cpu_hotplug(void)
4155 static void lttng_exit_cpu_hotplug(void)
4158 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4160 static int __init
lttng_events_init(void)
4164 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4167 ret
= wrapper_get_pfnblock_flags_mask_init();
4170 ret
= wrapper_get_pageblock_flags_mask_init();
4173 ret
= lttng_probes_init();
4176 ret
= lttng_context_init();
4179 ret
= lttng_tracepoint_init();
4182 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4183 if (!event_recorder_cache
) {
4185 goto error_kmem_event_recorder
;
4187 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4188 if (!event_recorder_private_cache
) {
4190 goto error_kmem_event_recorder_private
;
4192 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4193 if (!event_notifier_cache
) {
4195 goto error_kmem_event_notifier
;
4197 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4198 if (!event_notifier_private_cache
) {
4200 goto error_kmem_event_notifier_private
;
4202 ret
= lttng_abi_init();
4205 ret
= lttng_logger_init();
4208 ret
= lttng_init_cpu_hotplug();
4211 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4212 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4213 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4214 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4215 LTTNG_MODULES_EXTRAVERSION
,
4217 #ifdef LTTNG_EXTRA_VERSION_GIT
4218 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4222 #ifdef LTTNG_EXTRA_VERSION_NAME
4223 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4227 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4228 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4229 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4233 lttng_logger_exit();
4237 kmem_cache_destroy(event_notifier_private_cache
);
4238 error_kmem_event_notifier_private
:
4239 kmem_cache_destroy(event_notifier_cache
);
4240 error_kmem_event_notifier
:
4241 kmem_cache_destroy(event_recorder_private_cache
);
4242 error_kmem_event_recorder_private
:
4243 kmem_cache_destroy(event_recorder_cache
);
4244 error_kmem_event_recorder
:
4245 lttng_tracepoint_exit();
4247 lttng_context_exit();
4248 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4249 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4250 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4251 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4252 LTTNG_MODULES_EXTRAVERSION
,
4254 #ifdef LTTNG_EXTRA_VERSION_GIT
4255 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4259 #ifdef LTTNG_EXTRA_VERSION_NAME
4260 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4267 module_init(lttng_events_init
);
4269 static void __exit
lttng_events_exit(void)
4271 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4273 lttng_exit_cpu_hotplug();
4274 lttng_logger_exit();
4276 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4277 lttng_session_destroy(session_priv
->pub
);
4278 kmem_cache_destroy(event_recorder_cache
);
4279 kmem_cache_destroy(event_recorder_private_cache
);
4280 kmem_cache_destroy(event_notifier_cache
);
4281 kmem_cache_destroy(event_notifier_private_cache
);
4282 lttng_tracepoint_exit();
4283 lttng_context_exit();
4284 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4285 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4286 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4287 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4288 LTTNG_MODULES_EXTRAVERSION
,
4290 #ifdef LTTNG_EXTRA_VERSION_GIT
4291 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4295 #ifdef LTTNG_EXTRA_VERSION_NAME
4296 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4302 module_exit(lttng_events_exit
);
4304 #include <generated/patches.h>
4305 #ifdef LTTNG_EXTRA_VERSION_GIT
4306 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4308 #ifdef LTTNG_EXTRA_VERSION_NAME
4309 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4311 MODULE_LICENSE("GPL and additional rights");
4312 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4313 MODULE_DESCRIPTION("LTTng tracer");
4314 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4315 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4316 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4317 LTTNG_MODULES_EXTRAVERSION
);