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>
50 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0))
51 #include <linux/stdarg.h>
56 #define METADATA_CACHE_DEFAULT_SIZE 4096
58 static LIST_HEAD(sessions
);
59 static LIST_HEAD(event_notifier_groups
);
60 static LIST_HEAD(lttng_transport_list
);
61 static LIST_HEAD(lttng_counter_transport_list
);
63 * Protect the sessions and metadata caches.
65 static DEFINE_MUTEX(sessions_mutex
);
66 static struct kmem_cache
*event_recorder_cache
;
67 static struct kmem_cache
*event_recorder_private_cache
;
68 static struct kmem_cache
*event_notifier_cache
;
69 static struct kmem_cache
*event_notifier_private_cache
;
71 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
72 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
73 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
74 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
76 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
77 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
78 static void _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
80 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
);
82 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
84 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
86 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
87 const struct lttng_kernel_type_common
*type
,
88 enum lttng_kernel_string_encoding parent_encoding
,
91 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
92 const struct lttng_kernel_event_field
*field
,
93 size_t nesting
, const char **prev_field_name_p
);
95 void synchronize_trace(void)
97 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
98 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
104 #ifdef CONFIG_PREEMPT_RT_FULL
109 void lttng_lock_sessions(void)
111 mutex_lock(&sessions_mutex
);
114 void lttng_unlock_sessions(void)
116 mutex_unlock(&sessions_mutex
);
119 static struct lttng_transport
*lttng_transport_find(const char *name
)
121 struct lttng_transport
*transport
;
123 list_for_each_entry(transport
, <tng_transport_list
, node
) {
124 if (!strcmp(transport
->name
, name
))
131 * Called with sessions lock held.
133 int lttng_session_active(void)
135 struct lttng_kernel_session_private
*iter
;
137 list_for_each_entry(iter
, &sessions
, list
) {
138 if (iter
->pub
->active
)
144 struct lttng_kernel_session
*lttng_session_create(void)
146 struct lttng_kernel_session
*session
;
147 struct lttng_kernel_session_private
*session_priv
;
148 struct lttng_metadata_cache
*metadata_cache
;
151 mutex_lock(&sessions_mutex
);
152 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
155 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
157 goto err_free_session
;
158 session
->priv
= session_priv
;
159 session_priv
->pub
= session
;
161 INIT_LIST_HEAD(&session_priv
->chan
);
162 INIT_LIST_HEAD(&session_priv
->events
);
163 lttng_guid_gen(&session_priv
->uuid
);
165 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
168 goto err_free_session_private
;
169 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
170 if (!metadata_cache
->data
)
172 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
173 kref_init(&metadata_cache
->refcount
);
174 mutex_init(&metadata_cache
->lock
);
175 session_priv
->metadata_cache
= metadata_cache
;
176 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
177 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
178 sizeof(metadata_cache
->uuid
));
179 INIT_LIST_HEAD(&session_priv
->enablers_head
);
180 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
181 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
182 list_add(&session_priv
->list
, &sessions
);
184 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
185 goto tracker_alloc_error
;
186 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
187 goto tracker_alloc_error
;
188 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
189 goto tracker_alloc_error
;
190 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
195 goto tracker_alloc_error
;
197 mutex_unlock(&sessions_mutex
);
202 lttng_id_tracker_fini(&session
->pid_tracker
);
203 lttng_id_tracker_fini(&session
->vpid_tracker
);
204 lttng_id_tracker_fini(&session
->uid_tracker
);
205 lttng_id_tracker_fini(&session
->vuid_tracker
);
206 lttng_id_tracker_fini(&session
->gid_tracker
);
207 lttng_id_tracker_fini(&session
->vgid_tracker
);
209 kfree(metadata_cache
);
210 err_free_session_private
:
211 lttng_kvfree(session_priv
);
213 lttng_kvfree(session
);
215 mutex_unlock(&sessions_mutex
);
220 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
222 struct lttng_counter_transport
*transport
;
224 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
225 if (!strcmp(transport
->name
, name
))
231 struct lttng_counter
*lttng_kernel_counter_create(
232 const char *counter_transport_name
,
233 size_t number_dimensions
, const size_t *dimensions_sizes
)
235 struct lttng_counter
*counter
= NULL
;
236 struct lttng_counter_transport
*counter_transport
= NULL
;
238 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
239 if (!counter_transport
) {
240 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
241 counter_transport_name
);
244 if (!try_module_get(counter_transport
->owner
)) {
245 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
249 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
253 /* Create event notifier error counter. */
254 counter
->ops
= &counter_transport
->ops
;
255 counter
->transport
= counter_transport
;
257 counter
->counter
= counter
->ops
->counter_create(
258 number_dimensions
, dimensions_sizes
, 0);
259 if (!counter
->counter
) {
266 lttng_kvfree(counter
);
268 if (counter_transport
)
269 module_put(counter_transport
->owner
);
274 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
276 struct lttng_transport
*transport
= NULL
;
277 struct lttng_event_notifier_group
*event_notifier_group
;
278 const char *transport_name
= "relay-event-notifier";
279 size_t subbuf_size
= 4096; //TODO
280 size_t num_subbuf
= 16; //TODO
281 unsigned int switch_timer_interval
= 0;
282 unsigned int read_timer_interval
= 0;
285 mutex_lock(&sessions_mutex
);
287 transport
= lttng_transport_find(transport_name
);
289 printk(KERN_WARNING
"LTTng: transport %s not found\n",
293 if (!try_module_get(transport
->owner
)) {
294 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
299 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
301 if (!event_notifier_group
)
305 * Initialize the ring buffer used to store event notifier
308 event_notifier_group
->ops
= &transport
->ops
;
309 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
310 transport_name
, event_notifier_group
, NULL
,
311 subbuf_size
, num_subbuf
, switch_timer_interval
,
312 read_timer_interval
);
313 if (!event_notifier_group
->chan
)
316 event_notifier_group
->transport
= transport
;
318 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
319 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
320 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
321 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
323 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
325 mutex_unlock(&sessions_mutex
);
327 return event_notifier_group
;
330 lttng_kvfree(event_notifier_group
);
333 module_put(transport
->owner
);
335 mutex_unlock(&sessions_mutex
);
339 void metadata_cache_destroy(struct kref
*kref
)
341 struct lttng_metadata_cache
*cache
=
342 container_of(kref
, struct lttng_metadata_cache
, refcount
);
347 void lttng_session_destroy(struct lttng_kernel_session
*session
)
349 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
350 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
351 struct lttng_metadata_stream
*metadata_stream
;
352 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
355 mutex_lock(&sessions_mutex
);
356 WRITE_ONCE(session
->active
, 0);
357 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
358 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
361 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
)
362 _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
363 synchronize_trace(); /* Wait for in-flight events to complete */
364 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
365 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
368 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
369 lttng_event_enabler_destroy(event_enabler
);
370 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
371 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
372 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
373 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
374 _lttng_channel_destroy(chan_priv
->pub
);
376 mutex_lock(&session
->priv
->metadata_cache
->lock
);
377 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
378 _lttng_metadata_channel_hangup(metadata_stream
);
379 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
380 lttng_id_tracker_fini(&session
->pid_tracker
);
381 lttng_id_tracker_fini(&session
->vpid_tracker
);
382 lttng_id_tracker_fini(&session
->uid_tracker
);
383 lttng_id_tracker_fini(&session
->vuid_tracker
);
384 lttng_id_tracker_fini(&session
->gid_tracker
);
385 lttng_id_tracker_fini(&session
->vgid_tracker
);
386 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
387 list_del(&session
->priv
->list
);
388 mutex_unlock(&sessions_mutex
);
389 lttng_kvfree(session
->priv
);
390 lttng_kvfree(session
);
393 void lttng_event_notifier_group_destroy(
394 struct lttng_event_notifier_group
*event_notifier_group
)
396 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
397 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
400 if (!event_notifier_group
)
403 mutex_lock(&sessions_mutex
);
405 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
408 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
409 &event_notifier_group
->event_notifiers_head
, parent
.node
)
410 _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
412 /* Wait for in-flight event notifier to complete */
415 irq_work_sync(&event_notifier_group
->wakeup_pending
);
417 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
420 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
421 &event_notifier_group
->enablers_head
, node
)
422 lttng_event_enabler_destroy(event_enabler
);
424 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
425 &event_notifier_group
->event_notifiers_head
, parent
.node
)
426 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
428 if (event_notifier_group
->error_counter
) {
429 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
431 error_counter
->ops
->counter_destroy(error_counter
->counter
);
432 module_put(error_counter
->transport
->owner
);
433 lttng_kvfree(error_counter
);
434 event_notifier_group
->error_counter
= NULL
;
437 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
438 module_put(event_notifier_group
->transport
->owner
);
439 list_del(&event_notifier_group
->node
);
441 mutex_unlock(&sessions_mutex
);
442 lttng_kvfree(event_notifier_group
);
445 int lttng_session_statedump(struct lttng_kernel_session
*session
)
449 mutex_lock(&sessions_mutex
);
450 ret
= lttng_statedump_start(session
);
451 mutex_unlock(&sessions_mutex
);
455 int lttng_session_enable(struct lttng_kernel_session
*session
)
458 struct lttng_kernel_channel_buffer_private
*chan_priv
;
460 mutex_lock(&sessions_mutex
);
461 if (session
->active
) {
466 /* Set transient enabler state to "enabled" */
467 session
->priv
->tstate
= 1;
469 /* We need to sync enablers with session before activation. */
470 lttng_session_sync_event_enablers(session
);
473 * Snapshot the number of events per channel to know the type of header
476 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
477 if (chan_priv
->header_type
)
478 continue; /* don't change it if session stop/restart */
479 if (chan_priv
->free_event_id
< 31)
480 chan_priv
->header_type
= 1; /* compact */
482 chan_priv
->header_type
= 2; /* large */
485 /* Clear each stream's quiescent state. */
486 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
487 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
488 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
491 WRITE_ONCE(session
->active
, 1);
492 WRITE_ONCE(session
->priv
->been_active
, 1);
493 ret
= _lttng_session_metadata_statedump(session
);
495 WRITE_ONCE(session
->active
, 0);
498 ret
= lttng_statedump_start(session
);
500 WRITE_ONCE(session
->active
, 0);
502 mutex_unlock(&sessions_mutex
);
506 int lttng_session_disable(struct lttng_kernel_session
*session
)
509 struct lttng_kernel_channel_buffer_private
*chan_priv
;
511 mutex_lock(&sessions_mutex
);
512 if (!session
->active
) {
516 WRITE_ONCE(session
->active
, 0);
518 /* Set transient enabler state to "disabled" */
519 session
->priv
->tstate
= 0;
520 lttng_session_sync_event_enablers(session
);
522 /* Set each stream's quiescent state. */
523 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
524 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
525 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
528 mutex_unlock(&sessions_mutex
);
532 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
535 struct lttng_kernel_channel_buffer_private
*chan_priv
;
536 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
537 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
538 struct lttng_metadata_stream
*stream
;
540 mutex_lock(&sessions_mutex
);
541 if (!session
->active
) {
546 mutex_lock(&cache
->lock
);
547 memset(cache
->data
, 0, cache
->cache_alloc
);
548 cache
->metadata_written
= 0;
550 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
551 stream
->metadata_out
= 0;
552 stream
->metadata_in
= 0;
554 mutex_unlock(&cache
->lock
);
556 session
->priv
->metadata_dumped
= 0;
557 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
558 chan_priv
->metadata_dumped
= 0;
561 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
562 event_recorder_priv
->metadata_dumped
= 0;
565 ret
= _lttng_session_metadata_statedump(session
);
568 mutex_unlock(&sessions_mutex
);
573 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
575 struct lttng_kernel_channel_buffer
*chan_buf
;
577 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
579 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
580 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
585 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
589 mutex_lock(&sessions_mutex
);
590 if (is_channel_buffer_metadata(channel
)) {
594 if (channel
->enabled
) {
598 /* Set transient enabler state to "enabled" */
599 channel
->priv
->tstate
= 1;
600 lttng_session_sync_event_enablers(channel
->session
);
601 /* Set atomically the state to "enabled" */
602 WRITE_ONCE(channel
->enabled
, 1);
604 mutex_unlock(&sessions_mutex
);
608 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
612 mutex_lock(&sessions_mutex
);
613 if (is_channel_buffer_metadata(channel
)) {
617 if (!channel
->enabled
) {
621 /* Set atomically the state to "disabled" */
622 WRITE_ONCE(channel
->enabled
, 0);
623 /* Set transient enabler state to "enabled" */
624 channel
->priv
->tstate
= 0;
625 lttng_session_sync_event_enablers(channel
->session
);
627 mutex_unlock(&sessions_mutex
);
631 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
635 mutex_lock(&sessions_mutex
);
636 switch (event
->type
) {
637 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
639 struct lttng_kernel_event_recorder
*event_recorder
=
640 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
642 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
648 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
649 switch (event
->priv
->instrumentation
) {
650 case LTTNG_KERNEL_ABI_KRETPROBE
:
661 if (event
->enabled
) {
665 switch (event
->priv
->instrumentation
) {
666 case LTTNG_KERNEL_ABI_TRACEPOINT
:
668 case LTTNG_KERNEL_ABI_SYSCALL
:
672 case LTTNG_KERNEL_ABI_KPROBE
:
674 case LTTNG_KERNEL_ABI_UPROBE
:
675 WRITE_ONCE(event
->enabled
, 1);
678 case LTTNG_KERNEL_ABI_KRETPROBE
:
679 ret
= lttng_kretprobes_event_enable_state(event
, 1);
682 case LTTNG_KERNEL_ABI_FUNCTION
:
684 case LTTNG_KERNEL_ABI_NOOP
:
691 mutex_unlock(&sessions_mutex
);
695 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
699 mutex_lock(&sessions_mutex
);
700 switch (event
->type
) {
701 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
703 struct lttng_kernel_event_recorder
*event_recorder
=
704 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
706 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
712 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
713 switch (event
->priv
->instrumentation
) {
714 case LTTNG_KERNEL_ABI_KRETPROBE
:
725 if (!event
->enabled
) {
729 switch (event
->priv
->instrumentation
) {
730 case LTTNG_KERNEL_ABI_TRACEPOINT
:
732 case LTTNG_KERNEL_ABI_SYSCALL
:
736 case LTTNG_KERNEL_ABI_KPROBE
:
738 case LTTNG_KERNEL_ABI_UPROBE
:
739 WRITE_ONCE(event
->enabled
, 0);
742 case LTTNG_KERNEL_ABI_KRETPROBE
:
743 ret
= lttng_kretprobes_event_enable_state(event
, 0);
746 case LTTNG_KERNEL_ABI_FUNCTION
:
748 case LTTNG_KERNEL_ABI_NOOP
:
755 mutex_unlock(&sessions_mutex
);
759 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
760 const char *transport_name
,
762 size_t subbuf_size
, size_t num_subbuf
,
763 unsigned int switch_timer_interval
,
764 unsigned int read_timer_interval
,
765 enum channel_type channel_type
)
767 struct lttng_kernel_channel_buffer
*chan
;
768 struct lttng_kernel_channel_buffer_private
*chan_priv
;
769 struct lttng_transport
*transport
= NULL
;
771 mutex_lock(&sessions_mutex
);
772 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
773 goto active
; /* Refuse to add channel to active session */
774 transport
= lttng_transport_find(transport_name
);
776 printk(KERN_WARNING
"LTTng: transport %s not found\n",
780 if (!try_module_get(transport
->owner
)) {
781 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
784 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
787 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
790 chan
->priv
= chan_priv
;
791 chan_priv
->pub
= chan
;
792 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
793 chan
->parent
.session
= session
;
794 chan
->priv
->id
= session
->priv
->free_chan_id
++;
795 chan
->ops
= &transport
->ops
;
797 * Note: the channel creation op already writes into the packet
798 * headers. Therefore the "chan" information used as input
799 * should be already accessible.
801 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
802 chan
, buf_addr
, subbuf_size
, num_subbuf
,
803 switch_timer_interval
, read_timer_interval
);
804 if (!chan
->priv
->rb_chan
)
806 chan
->priv
->parent
.tstate
= 1;
807 chan
->parent
.enabled
= 1;
808 chan
->priv
->transport
= transport
;
809 chan
->priv
->channel_type
= channel_type
;
810 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
811 mutex_unlock(&sessions_mutex
);
820 module_put(transport
->owner
);
823 mutex_unlock(&sessions_mutex
);
828 * Only used internally at session destruction for per-cpu channels, and
829 * when metadata channel is released.
830 * Needs to be called with sessions mutex held.
833 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
835 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
836 module_put(chan
->priv
->transport
->owner
);
837 list_del(&chan
->priv
->node
);
838 lttng_kernel_destroy_context(chan
->priv
->ctx
);
843 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
845 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
847 /* Protect the metadata cache with the sessions_mutex. */
848 mutex_lock(&sessions_mutex
);
849 _lttng_channel_destroy(chan
);
850 mutex_unlock(&sessions_mutex
);
852 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
855 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
857 stream
->finalized
= 1;
858 wake_up_interruptible(&stream
->read_wait
);
862 bool lttng_kernel_event_id_available(struct lttng_event_enabler_common
*event_enabler
)
864 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
865 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
867 switch (event_enabler
->enabler_type
) {
868 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
870 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
871 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
872 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
875 case LTTNG_KERNEL_ABI_TRACEPOINT
:
877 case LTTNG_KERNEL_ABI_KPROBE
:
879 case LTTNG_KERNEL_ABI_SYSCALL
:
881 case LTTNG_KERNEL_ABI_UPROBE
:
882 if (chan
->priv
->free_event_id
== -1U)
885 case LTTNG_KERNEL_ABI_KRETPROBE
:
886 /* kretprobes require 2 event IDs. */
887 if (chan
->priv
->free_event_id
>= -2U)
895 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
904 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
906 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
907 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
909 switch (event_enabler
->enabler_type
) {
910 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
912 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
913 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
914 struct lttng_kernel_event_recorder
*event_recorder
;
915 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
916 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
918 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
921 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
922 if (!event_recorder_priv
) {
923 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
926 event_recorder_priv
->pub
= event_recorder
;
927 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
928 event_recorder
->priv
= event_recorder_priv
;
929 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
931 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
932 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
933 event_recorder
->priv
->parent
.instrumentation
= itype
;
934 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
935 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
937 event_recorder
->chan
= chan
;
938 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
939 return &event_recorder
->parent
;
941 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
943 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
944 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
945 struct lttng_kernel_event_notifier
*event_notifier
;
946 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
948 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
951 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
952 if (!event_notifier_priv
) {
953 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
956 event_notifier_priv
->pub
= event_notifier
;
957 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
958 event_notifier
->priv
= event_notifier_priv
;
959 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
961 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
962 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
963 event_notifier
->priv
->parent
.instrumentation
= itype
;
964 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
965 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
966 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
968 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
969 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
970 event_notifier
->priv
->num_captures
= 0;
971 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
972 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
973 return &event_notifier
->parent
;
981 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
983 switch (event
->type
) {
984 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
986 struct lttng_kernel_event_recorder
*event_recorder
=
987 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
989 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
990 kmem_cache_free(event_recorder_cache
, event_recorder
);
993 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
995 struct lttng_kernel_event_notifier
*event_notifier
=
996 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
998 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
999 kmem_cache_free(event_notifier_cache
, event_notifier
);
1008 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
1010 switch (event
->type
) {
1011 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1013 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1015 struct lttng_kernel_event_notifier
*event_notifier
=
1016 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1017 struct lttng_counter
*error_counter
;
1018 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
1019 size_t dimension_index
[1];
1023 * Clear the error counter bucket. The sessiond keeps track of which
1024 * bucket is currently in use. We trust it. The session lock
1025 * synchronizes against concurrent creation of the error
1028 error_counter
= event_notifier_group
->error_counter
;
1032 * Check that the index is within the boundary of the counter.
1034 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1035 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1036 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1040 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1041 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1043 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1044 event_notifier
->priv
->error_counter_index
);
1055 * Supports event creation while tracing session is active.
1056 * Needs to be called with sessions mutex held.
1058 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1059 const struct lttng_kernel_event_desc
*event_desc
)
1061 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
1062 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
1063 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
1064 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1065 struct lttng_kernel_event_common_private
*event_priv
;
1066 struct lttng_kernel_event_common
*event
;
1067 const char *event_name
;
1068 struct hlist_head
*head
;
1071 if (!lttng_kernel_event_id_available(event_enabler
)) {
1077 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1078 event_name
= event_desc
->event_name
;
1081 case LTTNG_KERNEL_ABI_KPROBE
:
1083 case LTTNG_KERNEL_ABI_UPROBE
:
1085 case LTTNG_KERNEL_ABI_KRETPROBE
:
1087 case LTTNG_KERNEL_ABI_SYSCALL
:
1088 event_name
= event_param
->name
;
1091 case LTTNG_KERNEL_ABI_FUNCTION
:
1093 case LTTNG_KERNEL_ABI_NOOP
:
1101 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1102 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1103 if (lttng_event_enabler_event_name_match_event(event_enabler
, event_name
, event_priv
->pub
)) {
1109 event
= lttng_kernel_event_alloc(event_enabler
);
1116 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1117 /* Event will be enabled by enabler sync. */
1119 event
->priv
->registered
= 0;
1120 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1121 if (!event
->priv
->desc
) {
1123 goto register_error
;
1125 /* Populate lttng_event structure before event registration. */
1129 case LTTNG_KERNEL_ABI_KPROBE
:
1131 * Needs to be explicitly enabled after creation, since
1132 * we may want to apply filters.
1135 event
->priv
->registered
= 1;
1137 * Populate lttng_event structure before event
1141 ret
= lttng_kprobes_register_event(event_name
,
1142 event_param
->u
.kprobe
.symbol_name
,
1143 event_param
->u
.kprobe
.offset
,
1144 event_param
->u
.kprobe
.addr
,
1148 goto register_error
;
1150 ret
= try_module_get(event
->priv
->desc
->owner
);
1154 case LTTNG_KERNEL_ABI_KRETPROBE
:
1156 struct lttng_kernel_event_common
*event_return
;
1158 /* kretprobe defines 2 events */
1160 * Needs to be explicitly enabled after creation, since
1161 * we may want to apply filters.
1164 event
->priv
->registered
= 1;
1166 event_return
= lttng_kernel_event_alloc(event_enabler
);
1172 event_return
->enabled
= 0;
1173 event_return
->priv
->registered
= 1;
1176 * Populate lttng_event structure before kretprobe registration.
1179 ret
= lttng_kretprobes_register(event_name
,
1180 event_param
->u
.kretprobe
.symbol_name
,
1181 event_param
->u
.kretprobe
.offset
,
1182 event_param
->u
.kretprobe
.addr
,
1183 event
, event_return
);
1185 lttng_kernel_event_free(event_return
);
1187 goto register_error
;
1189 /* Take 2 refs on the module: one per event. */
1190 ret
= try_module_get(event
->priv
->desc
->owner
);
1192 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1194 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1195 WARN_ON_ONCE(ret
> 0);
1197 lttng_kernel_event_free(event_return
);
1198 module_put(event_return
->priv
->desc
->owner
);
1199 module_put(event
->priv
->desc
->owner
);
1200 goto statedump_error
;
1202 list_add(&event_return
->priv
->node
, event_list_head
);
1206 case LTTNG_KERNEL_ABI_SYSCALL
:
1208 * Needs to be explicitly enabled after creation, since
1209 * we may want to apply filters.
1212 event
->priv
->registered
= 0;
1213 event
->priv
->desc
= event_desc
;
1214 switch (event_param
->u
.syscall
.entryexit
) {
1215 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1217 goto register_error
;
1218 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1219 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1221 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1222 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1225 switch (event_param
->u
.syscall
.abi
) {
1226 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1228 goto register_error
;
1229 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1230 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1232 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1233 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1236 if (!event
->priv
->desc
) {
1238 goto register_error
;
1242 case LTTNG_KERNEL_ABI_UPROBE
:
1244 * Needs to be explicitly enabled after creation, since
1245 * we may want to apply filters.
1248 event
->priv
->registered
= 1;
1251 * Populate lttng_event structure before event
1256 ret
= lttng_uprobes_register_event(event_param
->name
,
1257 event_param
->u
.uprobe
.fd
,
1260 goto register_error
;
1261 ret
= try_module_get(event
->priv
->desc
->owner
);
1268 goto register_error
;
1271 ret
= _lttng_event_recorder_metadata_statedump(event
);
1272 WARN_ON_ONCE(ret
> 0);
1274 goto statedump_error
;
1277 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1279 goto register_error
;
1281 hlist_add_head(&event
->priv
->hlist_node
, head
);
1282 list_add(&event
->priv
->node
, event_list_head
);
1287 /* If a statedump error occurs, events will not be readable. */
1289 lttng_kernel_event_free(event
);
1294 return ERR_PTR(ret
);
1297 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1298 const struct lttng_kernel_event_desc
*event_desc
)
1300 struct lttng_kernel_event_common
*event
;
1302 mutex_lock(&sessions_mutex
);
1303 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1304 mutex_unlock(&sessions_mutex
);
1308 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1309 const size_t *dim_indexes
, int32_t cpu
,
1310 int64_t *val
, bool *overflow
, bool *underflow
)
1312 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1313 cpu
, val
, overflow
, underflow
);
1316 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1317 const size_t *dim_indexes
, int64_t *val
,
1318 bool *overflow
, bool *underflow
)
1320 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1321 val
, overflow
, underflow
);
1324 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1325 const size_t *dim_indexes
)
1327 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1330 /* Only used for tracepoints and system calls for now. */
1332 void register_event(struct lttng_kernel_event_common
*event
)
1334 const struct lttng_kernel_event_desc
*desc
;
1337 WARN_ON_ONCE(event
->priv
->registered
);
1339 desc
= event
->priv
->desc
;
1340 switch (event
->priv
->instrumentation
) {
1341 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1342 ret
= lttng_tracepoint_probe_register(desc
->event_kname
,
1343 desc
->tp_class
->probe_callback
,
1347 case LTTNG_KERNEL_ABI_SYSCALL
:
1348 ret
= lttng_syscall_filter_enable_event(event
);
1351 case LTTNG_KERNEL_ABI_KPROBE
:
1353 case LTTNG_KERNEL_ABI_UPROBE
:
1357 case LTTNG_KERNEL_ABI_KRETPROBE
:
1358 switch (event
->type
) {
1359 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1362 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1368 case LTTNG_KERNEL_ABI_FUNCTION
:
1370 case LTTNG_KERNEL_ABI_NOOP
:
1377 event
->priv
->registered
= 1;
1381 void unregister_event(struct lttng_kernel_event_common
*event
)
1383 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1384 const struct lttng_kernel_event_desc
*desc
;
1387 WARN_ON_ONCE(!event
->priv
->registered
);
1389 desc
= event_priv
->desc
;
1390 switch (event_priv
->instrumentation
) {
1391 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1392 ret
= lttng_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1393 event_priv
->desc
->tp_class
->probe_callback
,
1397 case LTTNG_KERNEL_ABI_KPROBE
:
1398 lttng_kprobes_unregister_event(event
);
1402 case LTTNG_KERNEL_ABI_KRETPROBE
:
1403 switch (event
->type
) {
1404 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1405 lttng_kretprobes_unregister(event
);
1408 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1414 case LTTNG_KERNEL_ABI_SYSCALL
:
1415 ret
= lttng_syscall_filter_disable_event(event
);
1418 case LTTNG_KERNEL_ABI_NOOP
:
1419 switch (event
->type
) {
1420 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1423 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1429 case LTTNG_KERNEL_ABI_UPROBE
:
1430 lttng_uprobes_unregister_event(event
);
1434 case LTTNG_KERNEL_ABI_FUNCTION
:
1441 event_priv
->registered
= 0;
1445 void _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1447 if (event
->priv
->registered
)
1448 unregister_event(event
);
1452 * Only used internally at session destruction.
1455 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1457 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1458 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1460 lttng_free_event_filter_runtime(event
);
1461 /* Free event enabler refs */
1462 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1463 &event_priv
->enablers_ref_head
, node
)
1466 switch (event
->type
) {
1467 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1469 struct lttng_kernel_event_recorder
*event_recorder
=
1470 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1472 switch (event_priv
->instrumentation
) {
1473 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1474 lttng_event_desc_put(event_priv
->desc
);
1477 case LTTNG_KERNEL_ABI_KPROBE
:
1478 module_put(event_priv
->desc
->owner
);
1479 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1482 case LTTNG_KERNEL_ABI_KRETPROBE
:
1483 module_put(event_priv
->desc
->owner
);
1484 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1487 case LTTNG_KERNEL_ABI_SYSCALL
:
1490 case LTTNG_KERNEL_ABI_UPROBE
:
1491 module_put(event_priv
->desc
->owner
);
1492 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1495 case LTTNG_KERNEL_ABI_FUNCTION
:
1497 case LTTNG_KERNEL_ABI_NOOP
:
1502 list_del(&event_recorder
->priv
->parent
.node
);
1503 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1504 kmem_cache_free(event_recorder_cache
, event_recorder
);
1507 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1509 struct lttng_kernel_event_notifier
*event_notifier
=
1510 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1512 switch (event_notifier
->priv
->parent
.instrumentation
) {
1513 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1514 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1517 case LTTNG_KERNEL_ABI_KPROBE
:
1518 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1519 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1522 case LTTNG_KERNEL_ABI_SYSCALL
:
1525 case LTTNG_KERNEL_ABI_UPROBE
:
1526 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1527 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1530 case LTTNG_KERNEL_ABI_KRETPROBE
:
1532 case LTTNG_KERNEL_ABI_FUNCTION
:
1534 case LTTNG_KERNEL_ABI_NOOP
:
1539 list_del(&event_notifier
->priv
->parent
.node
);
1540 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1541 kmem_cache_free(event_notifier_cache
, event_notifier
);
1549 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1550 enum tracker_type tracker_type
)
1552 switch (tracker_type
) {
1554 return &session
->pid_tracker
;
1556 return &session
->vpid_tracker
;
1558 return &session
->uid_tracker
;
1560 return &session
->vuid_tracker
;
1562 return &session
->gid_tracker
;
1564 return &session
->vgid_tracker
;
1571 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1572 enum tracker_type tracker_type
, int id
)
1574 struct lttng_kernel_id_tracker
*tracker
;
1577 tracker
= get_tracker(session
, tracker_type
);
1582 mutex_lock(&sessions_mutex
);
1584 /* track all ids: destroy tracker. */
1585 lttng_id_tracker_destroy(tracker
, true);
1588 ret
= lttng_id_tracker_add(tracker
, id
);
1590 mutex_unlock(&sessions_mutex
);
1594 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1595 enum tracker_type tracker_type
, int id
)
1597 struct lttng_kernel_id_tracker
*tracker
;
1600 tracker
= get_tracker(session
, tracker_type
);
1605 mutex_lock(&sessions_mutex
);
1607 /* untrack all ids: replace by empty tracker. */
1608 ret
= lttng_id_tracker_empty_set(tracker
);
1610 ret
= lttng_id_tracker_del(tracker
, id
);
1612 mutex_unlock(&sessions_mutex
);
1617 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1619 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1620 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1621 struct lttng_id_hash_node
*e
;
1624 mutex_lock(&sessions_mutex
);
1626 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1627 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1629 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1635 /* ID tracker disabled. */
1636 if (iter
>= *pos
&& iter
== 0) {
1637 return id_tracker_p
; /* empty tracker */
1645 /* Called with sessions_mutex held. */
1647 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1649 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1650 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1651 struct lttng_id_hash_node
*e
;
1656 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1657 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1659 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1660 if (iter
++ >= *ppos
)
1665 /* ID tracker disabled. */
1666 if (iter
>= *ppos
&& iter
== 0)
1667 return p
; /* empty tracker */
1676 void id_list_stop(struct seq_file
*m
, void *p
)
1678 mutex_unlock(&sessions_mutex
);
1682 int id_list_show(struct seq_file
*m
, void *p
)
1684 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1685 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1688 if (p
== id_tracker_p
) {
1689 /* Tracker disabled. */
1692 const struct lttng_id_hash_node
*e
= p
;
1694 id
= lttng_id_tracker_get_node_id(e
);
1696 switch (id_tracker
->priv
->tracker_type
) {
1698 seq_printf(m
, "process { pid = %d; };\n", id
);
1701 seq_printf(m
, "process { vpid = %d; };\n", id
);
1704 seq_printf(m
, "user { uid = %d; };\n", id
);
1707 seq_printf(m
, "user { vuid = %d; };\n", id
);
1710 seq_printf(m
, "group { gid = %d; };\n", id
);
1713 seq_printf(m
, "group { vgid = %d; };\n", id
);
1716 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1722 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1723 .start
= id_list_start
,
1724 .next
= id_list_next
,
1725 .stop
= id_list_stop
,
1726 .show
= id_list_show
,
1730 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1732 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1736 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1738 struct seq_file
*m
= file
->private_data
;
1739 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1742 WARN_ON_ONCE(!id_tracker
);
1743 ret
= seq_release(inode
, file
);
1745 fput(id_tracker
->priv
->session
->priv
->file
);
1749 const struct file_operations lttng_tracker_ids_list_fops
= {
1750 .owner
= THIS_MODULE
,
1751 .open
= lttng_tracker_ids_list_open
,
1753 .llseek
= seq_lseek
,
1754 .release
= lttng_tracker_ids_list_release
,
1757 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1758 enum tracker_type tracker_type
)
1760 struct file
*tracker_ids_list_file
;
1764 file_fd
= get_unused_fd_flags(0);
1770 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1771 <tng_tracker_ids_list_fops
,
1773 if (IS_ERR(tracker_ids_list_file
)) {
1774 ret
= PTR_ERR(tracker_ids_list_file
);
1777 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1779 goto refcount_error
;
1781 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1784 m
= tracker_ids_list_file
->private_data
;
1786 m
->private = get_tracker(session
, tracker_type
);
1787 BUG_ON(!m
->private);
1788 fd_install(file_fd
, tracker_ids_list_file
);
1793 atomic_long_dec(&session
->priv
->file
->f_count
);
1795 fput(tracker_ids_list_file
);
1797 put_unused_fd(file_fd
);
1803 * Enabler management.
1806 int lttng_match_enabler_star_glob(const char *desc_name
,
1807 const char *pattern
)
1809 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1810 desc_name
, LTTNG_SIZE_MAX
))
1816 int lttng_match_enabler_name(const char *desc_name
,
1819 if (strcmp(desc_name
, name
))
1825 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1826 struct lttng_event_enabler_common
*enabler
)
1828 const char *desc_name
, *enabler_name
;
1829 bool compat
= false, entry
= false;
1831 enabler_name
= enabler
->event_param
.name
;
1832 switch (enabler
->event_param
.instrumentation
) {
1833 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1834 desc_name
= desc
->event_name
;
1835 switch (enabler
->format_type
) {
1836 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1837 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1838 case LTTNG_ENABLER_FORMAT_NAME
:
1839 return lttng_match_enabler_name(desc_name
, enabler_name
);
1845 case LTTNG_KERNEL_ABI_SYSCALL
:
1846 desc_name
= desc
->event_name
;
1847 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1848 desc_name
+= strlen("compat_");
1851 if (!strncmp(desc_name
, "syscall_exit_",
1852 strlen("syscall_exit_"))) {
1853 desc_name
+= strlen("syscall_exit_");
1854 } else if (!strncmp(desc_name
, "syscall_entry_",
1855 strlen("syscall_entry_"))) {
1856 desc_name
+= strlen("syscall_entry_");
1862 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1863 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1865 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1869 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1876 switch (enabler
->event_param
.u
.syscall
.abi
) {
1877 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1879 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1883 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1890 switch (enabler
->event_param
.u
.syscall
.match
) {
1891 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1892 switch (enabler
->format_type
) {
1893 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1894 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1895 case LTTNG_ENABLER_FORMAT_NAME
:
1896 return lttng_match_enabler_name(desc_name
, enabler_name
);
1901 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1902 return -EINVAL
; /* Not implemented. */
1914 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1915 struct lttng_event_enabler_common
*enabler
)
1919 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
1927 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
1928 struct lttng_kernel_event_common
*event
)
1930 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1933 switch (event_enabler
->enabler_type
) {
1934 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1936 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1937 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1938 struct lttng_kernel_event_recorder
*event_recorder
=
1939 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1941 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1942 && event_recorder
->chan
== event_recorder_enabler
->chan
)
1947 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1949 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1950 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1951 struct lttng_kernel_event_notifier
*event_notifier
=
1952 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1954 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1955 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1956 && event
->priv
->user_token
== event_enabler
->user_token
)
1967 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
1968 const struct lttng_kernel_event_desc
*desc
,
1969 struct lttng_kernel_event_common
*event
)
1971 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1974 switch (event_enabler
->enabler_type
) {
1975 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1977 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1978 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1979 struct lttng_kernel_event_recorder
*event_recorder
=
1980 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1982 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
1987 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1989 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1990 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1991 struct lttng_kernel_event_notifier
*event_notifier
=
1992 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1994 if (event
->priv
->desc
== desc
1995 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1996 && event
->priv
->user_token
== event_enabler
->user_token
)
2007 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2008 const char *event_name
,
2009 struct lttng_kernel_event_common
*event
)
2011 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2014 switch (event_enabler
->enabler_type
) {
2015 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2017 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2018 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2019 struct lttng_kernel_event_recorder
*event_recorder
=
2020 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2022 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2023 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2028 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2030 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2031 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2032 struct lttng_kernel_event_notifier
*event_notifier
=
2033 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2035 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2036 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2037 && event
->priv
->user_token
== event_enabler
->user_token
)
2049 struct lttng_enabler_ref
*lttng_enabler_ref(
2050 struct list_head
*enablers_ref_list
,
2051 struct lttng_event_enabler_common
*enabler
)
2053 struct lttng_enabler_ref
*enabler_ref
;
2055 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2056 if (enabler_ref
->ref
== enabler
)
2063 void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2065 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2066 struct lttng_kernel_probe_desc
*probe_desc
;
2067 const struct lttng_kernel_event_desc
*desc
;
2068 struct list_head
*probe_list
;
2071 probe_list
= lttng_get_probe_list_head();
2073 * For each probe event, if we find that a probe event matches
2074 * our enabler, create an associated lttng_event if not
2077 list_for_each_entry(probe_desc
, probe_list
, head
) {
2078 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2080 struct hlist_head
*head
;
2081 struct lttng_kernel_event_common
*event
;
2082 struct lttng_kernel_event_common_private
*event_priv
;
2084 desc
= probe_desc
->event_desc
[i
];
2085 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2089 * Check if already created.
2091 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2092 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2093 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
)) {
2102 * We need to create an event for this event probe.
2104 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2105 if (IS_ERR(event
)) {
2106 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2107 probe_desc
->event_desc
[i
]->event_name
);
2114 * Create event if it is missing and present in the list of tracepoint probes.
2115 * Should be called with sessions mutex held.
2118 void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2122 switch (event_enabler
->event_param
.instrumentation
) {
2123 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2124 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler
);
2127 case LTTNG_KERNEL_ABI_SYSCALL
:
2128 ret
= lttng_event_enabler_create_syscall_events_if_missing(event_enabler
);
2139 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2140 struct lttng_kernel_event_common
*event
)
2142 /* Link filter bytecodes if not linked yet. */
2143 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2144 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2148 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2149 struct lttng_kernel_event_common
*event
)
2151 switch (event_enabler
->enabler_type
) {
2152 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2154 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2156 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2157 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2158 struct lttng_kernel_event_notifier
*event_notifier
=
2159 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2161 /* Link capture bytecodes if not linked yet. */
2162 lttng_enabler_link_bytecode(event
->priv
->desc
,
2163 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2164 &event_notifier_enabler
->capture_bytecode_head
);
2165 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2174 * Create events associated with an event_enabler (if not already present),
2175 * and add backward reference from the event to the enabler.
2176 * Should be called with sessions mutex held.
2179 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2181 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2182 struct lttng_kernel_event_common_private
*event_priv
;
2184 lttng_syscall_table_set_wildcard_all(event_enabler
);
2186 /* First ensure that probe events are created for this enabler. */
2187 lttng_event_enabler_create_events_if_missing(event_enabler
);
2189 /* Link the created event with its associated enabler. */
2190 list_for_each_entry(event_priv
, event_list_head
, node
) {
2191 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2192 struct lttng_enabler_ref
*enabler_ref
;
2194 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2197 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2200 * If no backward ref, create it.
2201 * Add backward ref from event_notifier to enabler.
2203 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2207 enabler_ref
->ref
= event_enabler
;
2208 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2211 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2212 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2218 * Called at module load: connect the probe on all enablers matching
2220 * Called with sessions lock held.
2222 int lttng_fix_pending_events(void)
2224 struct lttng_kernel_session_private
*session_priv
;
2226 list_for_each_entry(session_priv
, &sessions
, list
)
2227 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2231 static bool lttng_event_notifier_group_has_active_event_notifiers(
2232 struct lttng_event_notifier_group
*event_notifier_group
)
2234 struct lttng_event_enabler_common
*event_enabler
;
2236 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2237 if (event_enabler
->enabled
)
2243 bool lttng_event_notifier_active(void)
2245 struct lttng_event_notifier_group
*event_notifier_group
;
2247 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2248 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2254 int lttng_fix_pending_event_notifiers(void)
2256 struct lttng_event_notifier_group
*event_notifier_group
;
2258 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2259 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2263 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2264 enum lttng_enabler_format_type format_type
,
2265 struct lttng_kernel_abi_event
*event_param
,
2266 struct lttng_kernel_channel_buffer
*chan
)
2268 struct lttng_event_recorder_enabler
*event_enabler
;
2270 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2273 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2274 event_enabler
->parent
.format_type
= format_type
;
2275 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2276 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2277 sizeof(event_enabler
->parent
.event_param
));
2278 event_enabler
->chan
= chan
;
2280 event_enabler
->parent
.enabled
= 0;
2281 return event_enabler
;
2284 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2285 struct lttng_event_recorder_enabler
*event_enabler
)
2287 mutex_lock(&sessions_mutex
);
2288 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2289 event_enabler
->parent
.published
= true;
2290 lttng_session_lazy_sync_event_enablers(session
);
2291 mutex_unlock(&sessions_mutex
);
2294 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2296 mutex_lock(&sessions_mutex
);
2297 event_enabler
->enabled
= 1;
2298 lttng_event_enabler_sync(event_enabler
);
2299 mutex_unlock(&sessions_mutex
);
2303 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2305 mutex_lock(&sessions_mutex
);
2306 event_enabler
->enabled
= 0;
2307 lttng_event_enabler_sync(event_enabler
);
2308 mutex_unlock(&sessions_mutex
);
2313 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2314 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2316 struct lttng_kernel_bytecode_node
*bytecode_node
;
2317 uint32_t bytecode_len
;
2320 ret
= get_user(bytecode_len
, &bytecode
->len
);
2323 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2327 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2328 sizeof(*bytecode
) + bytecode_len
);
2332 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2333 bytecode_node
->enabler
= enabler
;
2334 /* Enforce length based on allocated size */
2335 bytecode_node
->bc
.len
= bytecode_len
;
2336 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2341 lttng_kvfree(bytecode_node
);
2345 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2346 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2349 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2352 lttng_event_enabler_sync(event_enabler
);
2359 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2360 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2363 switch (event
->priv
->instrumentation
) {
2364 case LTTNG_KERNEL_ABI_UPROBE
:
2365 return lttng_uprobes_event_add_callsite(event
, callsite
);
2372 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2374 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2376 /* Destroy filter bytecode */
2377 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2378 &enabler
->filter_bytecode_head
, node
) {
2379 lttng_kvfree(filter_node
);
2383 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2385 lttng_enabler_destroy(event_enabler
);
2386 if (event_enabler
->published
)
2387 list_del(&event_enabler
->node
);
2389 switch (event_enabler
->enabler_type
) {
2390 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2392 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2393 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2395 kfree(event_recorder_enabler
);
2398 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2400 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2401 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2403 kfree(event_notifier_enabler
);
2411 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2412 enum lttng_enabler_format_type format_type
,
2413 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2414 struct lttng_event_notifier_group
*event_notifier_group
)
2416 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2418 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2419 if (!event_notifier_enabler
)
2422 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2423 event_notifier_enabler
->parent
.format_type
= format_type
;
2424 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2425 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2427 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2428 event_notifier_enabler
->num_captures
= 0;
2430 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2431 sizeof(event_notifier_enabler
->parent
.event_param
));
2433 event_notifier_enabler
->parent
.enabled
= 0;
2434 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2435 event_notifier_enabler
->group
= event_notifier_group
;
2436 return event_notifier_enabler
;
2439 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2440 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2442 mutex_lock(&sessions_mutex
);
2443 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2444 event_notifier_enabler
->parent
.published
= true;
2445 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2446 mutex_unlock(&sessions_mutex
);
2449 int lttng_event_notifier_enabler_enable(
2450 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2452 mutex_lock(&sessions_mutex
);
2453 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2454 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2455 mutex_unlock(&sessions_mutex
);
2459 int lttng_event_notifier_enabler_disable(
2460 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2462 mutex_lock(&sessions_mutex
);
2463 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2464 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2465 mutex_unlock(&sessions_mutex
);
2469 int lttng_event_notifier_enabler_attach_capture_bytecode(
2470 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2471 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2473 struct lttng_kernel_bytecode_node
*bytecode_node
;
2474 struct lttng_event_enabler_common
*enabler
=
2475 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2476 uint32_t bytecode_len
;
2479 ret
= get_user(bytecode_len
, &bytecode
->len
);
2483 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2488 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2489 sizeof(*bytecode
) + bytecode_len
);
2493 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2494 bytecode_node
->enabler
= enabler
;
2496 /* Enforce length based on allocated size */
2497 bytecode_node
->bc
.len
= bytecode_len
;
2498 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2500 event_notifier_enabler
->num_captures
++;
2502 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2506 lttng_kvfree(bytecode_node
);
2512 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2514 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2515 struct lttng_kernel_bytecode_runtime
*runtime
;
2516 struct lttng_enabler_ref
*enabler_ref
;
2518 /* Check if has enablers without bytecode enabled */
2519 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2520 if (enabler_ref
->ref
->enabled
2521 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2522 has_enablers_without_filter_bytecode
= 1;
2526 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2528 /* Enable filters */
2529 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2530 lttng_bytecode_sync_state(runtime
);
2533 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2537 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2539 switch (event
->type
) {
2540 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2542 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2544 struct lttng_kernel_event_notifier
*event_notifier
=
2545 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2546 struct lttng_kernel_bytecode_runtime
*runtime
;
2547 int nr_captures
= 0;
2549 /* Enable captures */
2550 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2551 lttng_bytecode_sync_state(runtime
);
2554 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2563 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2565 struct lttng_enabler_ref
*enabler_ref
;
2566 bool enabled
= false;
2568 switch (event
->priv
->instrumentation
) {
2569 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2571 case LTTNG_KERNEL_ABI_SYSCALL
:
2573 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2574 if (enabler_ref
->ref
->enabled
) {
2585 switch (event
->type
) {
2586 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2588 struct lttng_kernel_event_recorder
*event_recorder
=
2589 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2592 * Enabled state is based on union of enablers, with
2593 * intersection of session and channel transient enable
2596 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2598 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2607 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2609 switch (event
->priv
->instrumentation
) {
2610 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2612 case LTTNG_KERNEL_ABI_SYSCALL
:
2616 /* Not handled with lazy sync. */
2622 * Should be called with sessions mutex held.
2625 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2626 struct list_head
*event_list
)
2628 struct lttng_kernel_event_common_private
*event_priv
;
2629 struct lttng_event_enabler_common
*event_enabler
;
2631 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2632 lttng_event_enabler_ref_events(event_enabler
);
2635 * For each event, if at least one of its enablers is enabled,
2636 * and its channel and session transient states are enabled, we
2637 * enable the event, else we disable it.
2639 list_for_each_entry(event_priv
, event_list
, node
) {
2640 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2643 if (!lttng_event_is_lazy_sync(event
))
2646 enabled
= lttng_get_event_enabled_state(event
);
2647 WRITE_ONCE(event
->enabled
, enabled
);
2649 * Sync tracepoint registration with event enabled state.
2652 if (!event_priv
->registered
)
2653 register_event(event
);
2655 if (event_priv
->registered
)
2656 unregister_event(event
);
2659 lttng_event_sync_filter_state(event
);
2660 lttng_event_sync_capture_state(event
);
2665 * lttng_session_sync_event_enablers should be called just before starting a
2669 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2671 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2675 * Apply enablers to session events, adding events to session if need
2676 * be. It is required after each modification applied to an active
2677 * session, and right before session "start".
2678 * "lazy" sync means we only sync if required.
2679 * Should be called with sessions mutex held.
2682 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2684 /* We can skip if session is not active */
2685 if (!session
->active
)
2687 lttng_session_sync_event_enablers(session
);
2691 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2693 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2697 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2699 switch (event_enabler
->enabler_type
) {
2700 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2702 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2703 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2704 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2707 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2709 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2710 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2711 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2720 * Serialize at most one packet worth of metadata into a metadata
2722 * We grab the metadata cache mutex to get exclusive access to our metadata
2723 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2724 * allows us to do racy operations such as looking for remaining space left in
2725 * packet and write, since mutual exclusion protects us from concurrent writes.
2726 * Mutual exclusion on the metadata cache allow us to read the cache content
2727 * without racing against reallocation of the cache by updates.
2728 * Returns the number of bytes written in the channel, 0 if no data
2729 * was written and a negative value on error.
2731 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2732 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2734 struct lttng_kernel_ring_buffer_ctx ctx
;
2736 size_t len
, reserve_len
;
2739 * Ensure we support mutiple get_next / put sequences followed by
2740 * put_next. The metadata cache lock protects reading the metadata
2741 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2742 * "flush" operations on the buffer invoked by different processes.
2743 * Moreover, since the metadata cache memory can be reallocated, we
2744 * need to have exclusive access against updates even though we only
2747 mutex_lock(&stream
->metadata_cache
->lock
);
2748 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2749 if (stream
->metadata_in
!= stream
->metadata_out
)
2752 /* Metadata regenerated, change the version. */
2753 if (stream
->metadata_cache
->version
!= stream
->version
)
2754 stream
->version
= stream
->metadata_cache
->version
;
2756 len
= stream
->metadata_cache
->metadata_written
-
2757 stream
->metadata_in
;
2760 reserve_len
= min_t(size_t,
2761 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2763 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2764 sizeof(char), NULL
);
2766 * If reservation failed, return an error to the caller.
2768 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2770 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2771 stream
->coherent
= false;
2774 stream
->transport
->ops
.event_write(&ctx
,
2775 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2777 stream
->transport
->ops
.event_commit(&ctx
);
2778 stream
->metadata_in
+= reserve_len
;
2779 if (reserve_len
< len
)
2780 stream
->coherent
= false;
2782 stream
->coherent
= true;
2787 *coherent
= stream
->coherent
;
2788 mutex_unlock(&stream
->metadata_cache
->lock
);
2793 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2795 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2796 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2800 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2802 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2803 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2804 struct lttng_metadata_stream
*stream
;
2806 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2807 wake_up_interruptible(&stream
->read_wait
);
2808 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2813 * Write the metadata to the metadata cache.
2814 * Must be called with sessions_mutex held.
2815 * The metadata cache lock protects us from concurrent read access from
2816 * thread outputting metadata content to ring buffer.
2817 * The content of the printf is printed as a single atomic metadata
2820 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2821 const char *fmt
, ...)
2827 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2830 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2836 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2837 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2838 session
->priv
->metadata_cache
->cache_alloc
) {
2839 char *tmp_cache_realloc
;
2840 unsigned int tmp_cache_alloc_size
;
2842 tmp_cache_alloc_size
= max_t(unsigned int,
2843 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2844 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2845 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2846 if (!tmp_cache_realloc
)
2848 if (session
->priv
->metadata_cache
->data
) {
2849 memcpy(tmp_cache_realloc
,
2850 session
->priv
->metadata_cache
->data
,
2851 session
->priv
->metadata_cache
->cache_alloc
);
2852 vfree(session
->priv
->metadata_cache
->data
);
2855 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2856 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2858 memcpy(session
->priv
->metadata_cache
->data
+
2859 session
->priv
->metadata_cache
->metadata_written
,
2861 session
->priv
->metadata_cache
->metadata_written
+= len
;
2872 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2876 for (i
= 0; i
< nesting
; i
++) {
2879 ret
= lttng_metadata_printf(session
, " ");
2888 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2889 const struct lttng_kernel_event_field
*field
,
2892 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2896 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2897 const struct lttng_kernel_type_integer
*type
,
2898 enum lttng_kernel_string_encoding parent_encoding
,
2903 ret
= print_tabs(session
, nesting
);
2906 ret
= lttng_metadata_printf(session
,
2907 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2911 (parent_encoding
== lttng_kernel_string_encoding_none
)
2913 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
2917 #if __BYTE_ORDER == __BIG_ENDIAN
2918 type
->reverse_byte_order
? " byte_order = le;" : ""
2920 type
->reverse_byte_order
? " byte_order = be;" : ""
2927 * Must be called with sessions_mutex held.
2930 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
2931 const struct lttng_kernel_type_struct
*type
,
2934 const char *prev_field_name
= NULL
;
2936 uint32_t i
, nr_fields
;
2937 unsigned int alignment
;
2939 ret
= print_tabs(session
, nesting
);
2942 ret
= lttng_metadata_printf(session
,
2946 nr_fields
= type
->nr_fields
;
2947 for (i
= 0; i
< nr_fields
; i
++) {
2948 const struct lttng_kernel_event_field
*iter_field
;
2950 iter_field
= type
->fields
[i
];
2951 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
2955 ret
= print_tabs(session
, nesting
);
2958 alignment
= type
->alignment
;
2960 ret
= lttng_metadata_printf(session
,
2964 ret
= lttng_metadata_printf(session
,
2971 * Must be called with sessions_mutex held.
2974 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
2975 const struct lttng_kernel_event_field
*field
,
2980 ret
= _lttng_struct_type_statedump(session
,
2981 lttng_kernel_get_type_struct(field
->type
), nesting
);
2984 return lttng_field_name_statedump(session
, field
, nesting
);
2988 * Must be called with sessions_mutex held.
2991 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
2992 const struct lttng_kernel_type_variant
*type
,
2994 const char *prev_field_name
)
2996 const char *tag_name
;
2998 uint32_t i
, nr_choices
;
3000 tag_name
= type
->tag_name
;
3002 tag_name
= prev_field_name
;
3006 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3008 if (type
->alignment
!= 0)
3010 ret
= print_tabs(session
, nesting
);
3013 ret
= lttng_metadata_printf(session
,
3014 "variant <_%s> {\n",
3018 nr_choices
= type
->nr_choices
;
3019 for (i
= 0; i
< nr_choices
; i
++) {
3020 const struct lttng_kernel_event_field
*iter_field
;
3022 iter_field
= type
->choices
[i
];
3023 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3027 ret
= print_tabs(session
, nesting
);
3030 ret
= lttng_metadata_printf(session
,
3036 * Must be called with sessions_mutex held.
3039 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3040 const struct lttng_kernel_event_field
*field
,
3042 const char *prev_field_name
)
3046 ret
= _lttng_variant_type_statedump(session
,
3047 lttng_kernel_get_type_variant(field
->type
), nesting
,
3051 return lttng_field_name_statedump(session
, field
, nesting
);
3055 * Must be called with sessions_mutex held.
3058 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3059 const struct lttng_kernel_event_field
*field
,
3063 const struct lttng_kernel_type_array
*array_type
;
3064 const struct lttng_kernel_type_common
*elem_type
;
3066 array_type
= lttng_kernel_get_type_array(field
->type
);
3067 WARN_ON_ONCE(!array_type
);
3069 if (array_type
->alignment
) {
3070 ret
= print_tabs(session
, nesting
);
3073 ret
= lttng_metadata_printf(session
,
3074 "struct { } align(%u) _%s_padding;\n",
3075 array_type
->alignment
* CHAR_BIT
,
3081 * Nested compound types: Only array of structures and variants are
3082 * currently supported.
3084 elem_type
= array_type
->elem_type
;
3085 switch (elem_type
->type
) {
3086 case lttng_kernel_type_integer
:
3087 case lttng_kernel_type_struct
:
3088 case lttng_kernel_type_variant
:
3089 ret
= _lttng_type_statedump(session
, elem_type
,
3090 array_type
->encoding
, nesting
);
3098 ret
= lttng_metadata_printf(session
,
3101 array_type
->length
);
3106 * Must be called with sessions_mutex held.
3109 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3110 const struct lttng_kernel_event_field
*field
,
3112 const char *prev_field_name
)
3115 const char *length_name
;
3116 const struct lttng_kernel_type_sequence
*sequence_type
;
3117 const struct lttng_kernel_type_common
*elem_type
;
3119 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3120 WARN_ON_ONCE(!sequence_type
);
3122 length_name
= sequence_type
->length_name
;
3124 length_name
= prev_field_name
;
3128 if (sequence_type
->alignment
) {
3129 ret
= print_tabs(session
, nesting
);
3132 ret
= lttng_metadata_printf(session
,
3133 "struct { } align(%u) _%s_padding;\n",
3134 sequence_type
->alignment
* CHAR_BIT
,
3141 * Nested compound types: Only array of structures and variants are
3142 * currently supported.
3144 elem_type
= sequence_type
->elem_type
;
3145 switch (elem_type
->type
) {
3146 case lttng_kernel_type_integer
:
3147 case lttng_kernel_type_struct
:
3148 case lttng_kernel_type_variant
:
3149 ret
= _lttng_type_statedump(session
, elem_type
,
3150 sequence_type
->encoding
, nesting
);
3158 ret
= lttng_metadata_printf(session
,
3166 * Must be called with sessions_mutex held.
3169 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3170 const struct lttng_kernel_type_enum
*type
,
3173 const struct lttng_kernel_enum_desc
*enum_desc
;
3174 const struct lttng_kernel_type_common
*container_type
;
3176 unsigned int i
, nr_entries
;
3178 container_type
= type
->container_type
;
3179 if (container_type
->type
!= lttng_kernel_type_integer
) {
3183 enum_desc
= type
->desc
;
3184 nr_entries
= enum_desc
->nr_entries
;
3186 ret
= print_tabs(session
, nesting
);
3189 ret
= lttng_metadata_printf(session
, "enum : ");
3192 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3193 lttng_kernel_string_encoding_none
, 0);
3196 ret
= lttng_metadata_printf(session
, " {\n");
3199 /* Dump all entries */
3200 for (i
= 0; i
< nr_entries
; i
++) {
3201 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3204 ret
= print_tabs(session
, nesting
+ 1);
3207 ret
= lttng_metadata_printf(session
,
3211 len
= strlen(entry
->string
);
3212 /* Escape the character '"' */
3213 for (j
= 0; j
< len
; j
++) {
3214 char c
= entry
->string
[j
];
3218 ret
= lttng_metadata_printf(session
,
3222 ret
= lttng_metadata_printf(session
,
3226 ret
= lttng_metadata_printf(session
,
3233 ret
= lttng_metadata_printf(session
, "\"");
3237 if (entry
->options
.is_auto
) {
3238 ret
= lttng_metadata_printf(session
, ",\n");
3242 ret
= lttng_metadata_printf(session
,
3246 if (entry
->start
.signedness
)
3247 ret
= lttng_metadata_printf(session
,
3248 "%lld", (long long) entry
->start
.value
);
3250 ret
= lttng_metadata_printf(session
,
3251 "%llu", entry
->start
.value
);
3254 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3256 == entry
->end
.value
) {
3257 ret
= lttng_metadata_printf(session
,
3260 if (entry
->end
.signedness
) {
3261 ret
= lttng_metadata_printf(session
,
3263 (long long) entry
->end
.value
);
3265 ret
= lttng_metadata_printf(session
,
3274 ret
= print_tabs(session
, nesting
);
3277 ret
= lttng_metadata_printf(session
, "}");
3283 * Must be called with sessions_mutex held.
3286 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3287 const struct lttng_kernel_event_field
*field
,
3291 const struct lttng_kernel_type_enum
*enum_type
;
3293 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3294 WARN_ON_ONCE(!enum_type
);
3295 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3298 return lttng_field_name_statedump(session
, field
, nesting
);
3302 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3303 const struct lttng_kernel_event_field
*field
,
3308 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3309 lttng_kernel_string_encoding_none
, nesting
);
3312 return lttng_field_name_statedump(session
, field
, nesting
);
3316 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3317 const struct lttng_kernel_type_string
*type
,
3322 /* Default encoding is UTF8 */
3323 ret
= print_tabs(session
, nesting
);
3326 ret
= lttng_metadata_printf(session
,
3328 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3329 " { encoding = ASCII; }" : "");
3334 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3335 const struct lttng_kernel_event_field
*field
,
3338 const struct lttng_kernel_type_string
*string_type
;
3341 string_type
= lttng_kernel_get_type_string(field
->type
);
3342 WARN_ON_ONCE(!string_type
);
3343 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3346 return lttng_field_name_statedump(session
, field
, nesting
);
3350 * Must be called with sessions_mutex held.
3353 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3354 const struct lttng_kernel_type_common
*type
,
3355 enum lttng_kernel_string_encoding parent_encoding
,
3360 switch (type
->type
) {
3361 case lttng_kernel_type_integer
:
3362 ret
= _lttng_integer_type_statedump(session
,
3363 lttng_kernel_get_type_integer(type
),
3364 parent_encoding
, nesting
);
3366 case lttng_kernel_type_enum
:
3367 ret
= _lttng_enum_type_statedump(session
,
3368 lttng_kernel_get_type_enum(type
),
3371 case lttng_kernel_type_string
:
3372 ret
= _lttng_string_type_statedump(session
,
3373 lttng_kernel_get_type_string(type
),
3376 case lttng_kernel_type_struct
:
3377 ret
= _lttng_struct_type_statedump(session
,
3378 lttng_kernel_get_type_struct(type
),
3381 case lttng_kernel_type_variant
:
3382 ret
= _lttng_variant_type_statedump(session
,
3383 lttng_kernel_get_type_variant(type
),
3387 /* Nested arrays and sequences are not supported yet. */
3388 case lttng_kernel_type_array
:
3389 case lttng_kernel_type_sequence
:
3398 * Must be called with sessions_mutex held.
3401 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3402 const struct lttng_kernel_event_field
*field
,
3404 const char **prev_field_name_p
)
3406 const char *prev_field_name
= NULL
;
3409 if (prev_field_name_p
)
3410 prev_field_name
= *prev_field_name_p
;
3411 switch (field
->type
->type
) {
3412 case lttng_kernel_type_integer
:
3413 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3415 case lttng_kernel_type_enum
:
3416 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3418 case lttng_kernel_type_string
:
3419 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3421 case lttng_kernel_type_struct
:
3422 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3424 case lttng_kernel_type_array
:
3425 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3427 case lttng_kernel_type_sequence
:
3428 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3430 case lttng_kernel_type_variant
:
3431 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3438 if (prev_field_name_p
)
3439 *prev_field_name_p
= field
->name
;
3444 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3445 struct lttng_kernel_ctx
*ctx
)
3447 const char *prev_field_name
= NULL
;
3453 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3454 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3456 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3464 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3465 struct lttng_kernel_event_recorder
*event_recorder
)
3467 const char *prev_field_name
= NULL
;
3468 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3472 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3473 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3475 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3483 * Must be called with sessions_mutex held.
3484 * The entire event metadata is printed as a single atomic metadata
3488 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3490 struct lttng_kernel_event_recorder
*event_recorder
;
3491 struct lttng_kernel_channel_buffer
*chan
;
3492 struct lttng_kernel_session
*session
;
3495 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3497 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3498 chan
= event_recorder
->chan
;
3499 session
= chan
->parent
.session
;
3501 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3503 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3506 lttng_metadata_begin(session
);
3508 ret
= lttng_metadata_printf(session
,
3512 " stream_id = %u;\n",
3513 event_recorder
->priv
->parent
.desc
->event_name
,
3514 event_recorder
->priv
->id
,
3515 event_recorder
->chan
->priv
->id
);
3519 ret
= lttng_metadata_printf(session
,
3520 " fields := struct {\n"
3525 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3530 * LTTng space reservation can only reserve multiples of the
3533 ret
= lttng_metadata_printf(session
,
3539 event_recorder
->priv
->metadata_dumped
= 1;
3541 lttng_metadata_end(session
);
3547 * Must be called with sessions_mutex held.
3548 * The entire channel metadata is printed as a single atomic metadata
3552 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3553 struct lttng_kernel_channel_buffer
*chan
)
3557 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3560 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3563 lttng_metadata_begin(session
);
3565 WARN_ON_ONCE(!chan
->priv
->header_type
);
3566 ret
= lttng_metadata_printf(session
,
3569 " event.header := %s;\n"
3570 " packet.context := struct packet_context;\n",
3572 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3573 "struct event_header_large");
3577 if (chan
->priv
->ctx
) {
3578 ret
= lttng_metadata_printf(session
,
3579 " event.context := struct {\n");
3583 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3586 if (chan
->priv
->ctx
) {
3587 ret
= lttng_metadata_printf(session
,
3593 ret
= lttng_metadata_printf(session
,
3596 chan
->priv
->metadata_dumped
= 1;
3598 lttng_metadata_end(session
);
3603 * Must be called with sessions_mutex held.
3606 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3608 return lttng_metadata_printf(session
,
3609 "struct packet_context {\n"
3610 " uint64_clock_monotonic_t timestamp_begin;\n"
3611 " uint64_clock_monotonic_t timestamp_end;\n"
3612 " uint64_t content_size;\n"
3613 " uint64_t packet_size;\n"
3614 " uint64_t packet_seq_num;\n"
3615 " unsigned long events_discarded;\n"
3616 " uint32_t cpu_id;\n"
3623 * id: range: 0 - 30.
3624 * id 31 is reserved to indicate an extended header.
3627 * id: range: 0 - 65534.
3628 * id 65535 is reserved to indicate an extended header.
3630 * Must be called with sessions_mutex held.
3633 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3635 return lttng_metadata_printf(session
,
3636 "struct event_header_compact {\n"
3637 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3640 " uint27_clock_monotonic_t timestamp;\n"
3644 " uint64_clock_monotonic_t timestamp;\n"
3649 "struct event_header_large {\n"
3650 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3653 " uint32_clock_monotonic_t timestamp;\n"
3657 " uint64_clock_monotonic_t timestamp;\n"
3661 lttng_alignof(uint32_t) * CHAR_BIT
,
3662 lttng_alignof(uint16_t) * CHAR_BIT
3667 * Approximation of NTP time of day to clock monotonic correlation,
3668 * taken at start of trace.
3669 * Yes, this is only an approximation. Yes, we can (and will) do better
3670 * in future versions.
3671 * This function may return a negative offset. It may happen if the
3672 * system sets the REALTIME clock to 0 after boot.
3674 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3678 int64_t measure_clock_offset(void)
3680 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3681 uint64_t tcf
= trace_clock_freq();
3683 unsigned long flags
;
3684 struct timespec64 rts
= { 0, 0 };
3686 /* Disable interrupts to increase correlation precision. */
3687 local_irq_save(flags
);
3688 monotonic
[0] = trace_clock_read64();
3689 ktime_get_real_ts64(&rts
);
3690 monotonic
[1] = trace_clock_read64();
3691 local_irq_restore(flags
);
3693 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3694 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3695 if (tcf
== NSEC_PER_SEC
) {
3696 realtime
+= rts
.tv_nsec
;
3698 uint64_t n
= rts
.tv_nsec
* tcf
;
3700 do_div(n
, NSEC_PER_SEC
);
3703 offset
= (int64_t) realtime
- monotonic_avg
;
3708 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3716 while (cur
!= '\0') {
3719 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3723 ret
= lttng_metadata_printf(session
, "%c", '\\');
3726 /* We still print the current char */
3729 ret
= lttng_metadata_printf(session
, "%c", cur
);
3743 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3744 const char *field_value
)
3748 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3752 ret
= print_escaped_ctf_string(session
, field_value
);
3756 ret
= lttng_metadata_printf(session
, "\";\n");
3763 * Output metadata into this session's metadata buffers.
3764 * Must be called with sessions_mutex held.
3767 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3769 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3770 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3771 const char *product_uuid
;
3772 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3773 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3776 if (!LTTNG_READ_ONCE(session
->active
))
3779 lttng_metadata_begin(session
);
3781 if (session
->priv
->metadata_dumped
)
3784 snprintf(uuid_s
, sizeof(uuid_s
),
3785 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3786 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3787 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3788 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3789 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3791 ret
= lttng_metadata_printf(session
,
3792 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3793 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3794 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3795 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3796 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3797 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3798 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3804 " byte_order = %s;\n"
3805 " packet.header := struct {\n"
3806 " uint32_t magic;\n"
3807 " uint8_t uuid[16];\n"
3808 " uint32_t stream_id;\n"
3809 " uint64_t stream_instance_id;\n"
3812 lttng_alignof(uint8_t) * CHAR_BIT
,
3813 lttng_alignof(uint16_t) * CHAR_BIT
,
3814 lttng_alignof(uint32_t) * CHAR_BIT
,
3815 lttng_alignof(uint64_t) * CHAR_BIT
,
3816 sizeof(unsigned long) * CHAR_BIT
,
3817 lttng_alignof(unsigned long) * CHAR_BIT
,
3821 #if __BYTE_ORDER == __BIG_ENDIAN
3830 ret
= lttng_metadata_printf(session
,
3832 " hostname = \"%s\";\n"
3833 " domain = \"kernel\";\n"
3834 " sysname = \"%s\";\n"
3835 " kernel_release = \"%s\";\n"
3836 " kernel_version = \"%s\";\n"
3837 " tracer_name = \"lttng-modules\";\n"
3838 " tracer_major = %d;\n"
3839 " tracer_minor = %d;\n"
3840 " tracer_patchlevel = %d;\n"
3841 " trace_buffering_scheme = \"global\";\n",
3842 current
->nsproxy
->uts_ns
->name
.nodename
,
3846 LTTNG_MODULES_MAJOR_VERSION
,
3847 LTTNG_MODULES_MINOR_VERSION
,
3848 LTTNG_MODULES_PATCHLEVEL_VERSION
3853 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3856 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3857 session
->priv
->creation_time
);
3861 /* Add the product UUID to the 'env' section */
3862 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3864 ret
= lttng_metadata_printf(session
,
3865 " product_uuid = \"%s\";\n",
3872 /* Close the 'env' section */
3873 ret
= lttng_metadata_printf(session
, "};\n\n");
3877 ret
= lttng_metadata_printf(session
,
3879 " name = \"%s\";\n",
3885 if (!trace_clock_uuid(clock_uuid_s
)) {
3886 ret
= lttng_metadata_printf(session
,
3887 " uuid = \"%s\";\n",
3894 ret
= lttng_metadata_printf(session
,
3895 " description = \"%s\";\n"
3896 " freq = %llu; /* Frequency, in Hz */\n"
3897 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3900 trace_clock_description(),
3901 (unsigned long long) trace_clock_freq(),
3902 (long long) measure_clock_offset()
3907 ret
= lttng_metadata_printf(session
,
3908 "typealias integer {\n"
3909 " size = 27; align = 1; signed = false;\n"
3910 " map = clock.%s.value;\n"
3911 "} := uint27_clock_monotonic_t;\n"
3913 "typealias integer {\n"
3914 " size = 32; align = %u; signed = false;\n"
3915 " map = clock.%s.value;\n"
3916 "} := uint32_clock_monotonic_t;\n"
3918 "typealias integer {\n"
3919 " size = 64; align = %u; signed = false;\n"
3920 " map = clock.%s.value;\n"
3921 "} := uint64_clock_monotonic_t;\n\n",
3923 lttng_alignof(uint32_t) * CHAR_BIT
,
3925 lttng_alignof(uint64_t) * CHAR_BIT
,
3931 ret
= _lttng_stream_packet_context_declare(session
);
3935 ret
= _lttng_event_header_declare(session
);
3940 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
3941 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
3946 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
3947 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
3951 session
->priv
->metadata_dumped
= 1;
3953 lttng_metadata_end(session
);
3958 * lttng_transport_register - LTT transport registration
3959 * @transport: transport structure
3961 * Registers a transport which can be used as output to extract the data out of
3962 * LTTng. The module calling this registration function must ensure that no
3963 * trap-inducing code will be executed by the transport functions. E.g.
3964 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3965 * is made visible to the transport function. This registration acts as a
3966 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3967 * after its registration must it synchronize the TLBs.
3969 void lttng_transport_register(struct lttng_transport
*transport
)
3972 * Make sure no page fault can be triggered by the module about to be
3973 * registered. We deal with this here so we don't have to call
3974 * vmalloc_sync_mappings() in each module's init.
3976 wrapper_vmalloc_sync_mappings();
3978 mutex_lock(&sessions_mutex
);
3979 list_add_tail(&transport
->node
, <tng_transport_list
);
3980 mutex_unlock(&sessions_mutex
);
3982 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3985 * lttng_transport_unregister - LTT transport unregistration
3986 * @transport: transport structure
3988 void lttng_transport_unregister(struct lttng_transport
*transport
)
3990 mutex_lock(&sessions_mutex
);
3991 list_del(&transport
->node
);
3992 mutex_unlock(&sessions_mutex
);
3994 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
3996 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
3999 * Make sure no page fault can be triggered by the module about to be
4000 * registered. We deal with this here so we don't have to call
4001 * vmalloc_sync_mappings() in each module's init.
4003 wrapper_vmalloc_sync_mappings();
4005 mutex_lock(&sessions_mutex
);
4006 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4007 mutex_unlock(&sessions_mutex
);
4009 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4011 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4013 mutex_lock(&sessions_mutex
);
4014 list_del(&transport
->node
);
4015 mutex_unlock(&sessions_mutex
);
4017 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4019 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4021 enum cpuhp_state lttng_hp_prepare
;
4022 enum cpuhp_state lttng_hp_online
;
4024 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4026 struct lttng_cpuhp_node
*lttng_node
;
4028 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4029 switch (lttng_node
->component
) {
4030 case LTTNG_RING_BUFFER_FRONTEND
:
4032 case LTTNG_RING_BUFFER_BACKEND
:
4033 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4034 case LTTNG_RING_BUFFER_ITER
:
4036 case LTTNG_CONTEXT_PERF_COUNTERS
:
4043 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4045 struct lttng_cpuhp_node
*lttng_node
;
4047 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4048 switch (lttng_node
->component
) {
4049 case LTTNG_RING_BUFFER_FRONTEND
:
4050 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4051 case LTTNG_RING_BUFFER_BACKEND
:
4053 case LTTNG_RING_BUFFER_ITER
:
4055 case LTTNG_CONTEXT_PERF_COUNTERS
:
4056 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4062 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4064 struct lttng_cpuhp_node
*lttng_node
;
4066 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4067 switch (lttng_node
->component
) {
4068 case LTTNG_RING_BUFFER_FRONTEND
:
4069 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4070 case LTTNG_RING_BUFFER_BACKEND
:
4072 case LTTNG_RING_BUFFER_ITER
:
4073 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4074 case LTTNG_CONTEXT_PERF_COUNTERS
:
4075 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4081 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4083 struct lttng_cpuhp_node
*lttng_node
;
4085 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4086 switch (lttng_node
->component
) {
4087 case LTTNG_RING_BUFFER_FRONTEND
:
4088 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4089 case LTTNG_RING_BUFFER_BACKEND
:
4091 case LTTNG_RING_BUFFER_ITER
:
4093 case LTTNG_CONTEXT_PERF_COUNTERS
:
4100 static int __init
lttng_init_cpu_hotplug(void)
4104 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4105 lttng_hotplug_prepare
,
4106 lttng_hotplug_dead
);
4110 lttng_hp_prepare
= ret
;
4111 lttng_rb_set_hp_prepare(ret
);
4113 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4114 lttng_hotplug_online
,
4115 lttng_hotplug_offline
);
4117 cpuhp_remove_multi_state(lttng_hp_prepare
);
4118 lttng_hp_prepare
= 0;
4121 lttng_hp_online
= ret
;
4122 lttng_rb_set_hp_online(ret
);
4127 static void __exit
lttng_exit_cpu_hotplug(void)
4129 lttng_rb_set_hp_online(0);
4130 cpuhp_remove_multi_state(lttng_hp_online
);
4131 lttng_rb_set_hp_prepare(0);
4132 cpuhp_remove_multi_state(lttng_hp_prepare
);
4135 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4136 static int lttng_init_cpu_hotplug(void)
4140 static void lttng_exit_cpu_hotplug(void)
4143 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4145 static int __init
lttng_events_init(void)
4149 ret
= wrapper_get_pfnblock_flags_mask_init();
4152 ret
= lttng_probes_init();
4155 ret
= lttng_context_init();
4158 ret
= lttng_tracepoint_init();
4161 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4162 if (!event_recorder_cache
) {
4164 goto error_kmem_event_recorder
;
4166 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4167 if (!event_recorder_private_cache
) {
4169 goto error_kmem_event_recorder_private
;
4171 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4172 if (!event_notifier_cache
) {
4174 goto error_kmem_event_notifier
;
4176 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4177 if (!event_notifier_private_cache
) {
4179 goto error_kmem_event_notifier_private
;
4181 ret
= lttng_abi_init();
4184 ret
= lttng_logger_init();
4187 ret
= lttng_init_cpu_hotplug();
4190 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4191 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4192 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4193 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4194 LTTNG_MODULES_EXTRAVERSION
,
4196 #ifdef LTTNG_EXTRA_VERSION_GIT
4197 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4201 #ifdef LTTNG_EXTRA_VERSION_NAME
4202 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4206 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4207 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4208 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4212 lttng_logger_exit();
4216 kmem_cache_destroy(event_notifier_private_cache
);
4217 error_kmem_event_notifier_private
:
4218 kmem_cache_destroy(event_notifier_cache
);
4219 error_kmem_event_notifier
:
4220 kmem_cache_destroy(event_recorder_private_cache
);
4221 error_kmem_event_recorder_private
:
4222 kmem_cache_destroy(event_recorder_cache
);
4223 error_kmem_event_recorder
:
4224 lttng_tracepoint_exit();
4226 lttng_context_exit();
4227 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4228 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4229 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4230 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4231 LTTNG_MODULES_EXTRAVERSION
,
4233 #ifdef LTTNG_EXTRA_VERSION_GIT
4234 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4238 #ifdef LTTNG_EXTRA_VERSION_NAME
4239 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4246 module_init(lttng_events_init
);
4248 static void __exit
lttng_events_exit(void)
4250 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4252 lttng_exit_cpu_hotplug();
4253 lttng_logger_exit();
4255 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4256 lttng_session_destroy(session_priv
->pub
);
4257 kmem_cache_destroy(event_recorder_cache
);
4258 kmem_cache_destroy(event_recorder_private_cache
);
4259 kmem_cache_destroy(event_notifier_cache
);
4260 kmem_cache_destroy(event_notifier_private_cache
);
4261 lttng_tracepoint_exit();
4262 lttng_context_exit();
4263 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4264 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4265 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4266 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4267 LTTNG_MODULES_EXTRAVERSION
,
4269 #ifdef LTTNG_EXTRA_VERSION_GIT
4270 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4274 #ifdef LTTNG_EXTRA_VERSION_NAME
4275 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4281 module_exit(lttng_events_exit
);
4283 #include <generated/patches.h>
4284 #ifdef LTTNG_EXTRA_VERSION_GIT
4285 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4287 #ifdef LTTNG_EXTRA_VERSION_NAME
4288 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4290 MODULE_LICENSE("GPL and additional rights");
4291 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4292 MODULE_DESCRIPTION("LTTng tracer");
4293 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4294 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4295 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4296 LTTNG_MODULES_EXTRAVERSION
);