1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.h>
40 #include <lttng/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.h>
50 #include <wrapper/time.h>
52 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0) \
53 || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0))
54 #include <linux/stdarg.h>
59 #define METADATA_CACHE_DEFAULT_SIZE 4096
61 static LIST_HEAD(sessions
);
62 static LIST_HEAD(event_notifier_groups
);
63 static LIST_HEAD(lttng_transport_list
);
64 static LIST_HEAD(lttng_counter_transport_list
);
66 * Protect the sessions and metadata caches.
68 static DEFINE_MUTEX(sessions_mutex
);
69 static struct kmem_cache
*event_recorder_cache
;
70 static struct kmem_cache
*event_recorder_private_cache
;
71 static struct kmem_cache
*event_notifier_cache
;
72 static struct kmem_cache
*event_notifier_private_cache
;
74 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
75 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
76 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
77 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
78 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
80 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
81 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
82 static void _lttng_event_unregister(struct lttng_kernel_event_recorder
*event
);
83 static void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
85 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
86 struct lttng_kernel_channel_buffer
*chan
,
87 struct lttng_kernel_event_recorder
*event
);
89 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
91 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
93 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
94 const struct lttng_kernel_type_common
*type
,
95 enum lttng_kernel_string_encoding parent_encoding
,
98 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
99 const struct lttng_kernel_event_field
*field
,
100 size_t nesting
, const char **prev_field_name_p
);
102 void synchronize_trace(void)
104 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
105 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
111 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
112 #ifdef CONFIG_PREEMPT_RT_FULL
115 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
116 #ifdef CONFIG_PREEMPT_RT
119 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
122 void lttng_lock_sessions(void)
124 mutex_lock(&sessions_mutex
);
127 void lttng_unlock_sessions(void)
129 mutex_unlock(&sessions_mutex
);
132 static struct lttng_transport
*lttng_transport_find(const char *name
)
134 struct lttng_transport
*transport
;
136 list_for_each_entry(transport
, <tng_transport_list
, node
) {
137 if (!strcmp(transport
->name
, name
))
144 * Called with sessions lock held.
146 int lttng_session_active(void)
148 struct lttng_kernel_session_private
*iter
;
150 list_for_each_entry(iter
, &sessions
, list
) {
151 if (iter
->pub
->active
)
157 struct lttng_kernel_session
*lttng_session_create(void)
159 struct lttng_kernel_session
*session
;
160 struct lttng_kernel_session_private
*session_priv
;
161 struct lttng_metadata_cache
*metadata_cache
;
164 mutex_lock(&sessions_mutex
);
165 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
168 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
170 goto err_free_session
;
171 session
->priv
= session_priv
;
172 session_priv
->pub
= session
;
174 INIT_LIST_HEAD(&session_priv
->chan
);
175 INIT_LIST_HEAD(&session_priv
->events
);
176 lttng_guid_gen(&session_priv
->uuid
);
178 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
181 goto err_free_session_private
;
182 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
183 if (!metadata_cache
->data
)
185 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
186 kref_init(&metadata_cache
->refcount
);
187 mutex_init(&metadata_cache
->lock
);
188 session_priv
->metadata_cache
= metadata_cache
;
189 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
190 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
191 sizeof(metadata_cache
->uuid
));
192 INIT_LIST_HEAD(&session_priv
->enablers_head
);
193 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
194 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
195 list_add(&session_priv
->list
, &sessions
);
197 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
198 goto tracker_alloc_error
;
199 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
200 goto tracker_alloc_error
;
201 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
202 goto tracker_alloc_error
;
203 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
204 goto tracker_alloc_error
;
205 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
206 goto tracker_alloc_error
;
207 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
208 goto tracker_alloc_error
;
210 mutex_unlock(&sessions_mutex
);
215 lttng_id_tracker_fini(&session
->pid_tracker
);
216 lttng_id_tracker_fini(&session
->vpid_tracker
);
217 lttng_id_tracker_fini(&session
->uid_tracker
);
218 lttng_id_tracker_fini(&session
->vuid_tracker
);
219 lttng_id_tracker_fini(&session
->gid_tracker
);
220 lttng_id_tracker_fini(&session
->vgid_tracker
);
222 kfree(metadata_cache
);
223 err_free_session_private
:
224 lttng_kvfree(session_priv
);
226 lttng_kvfree(session
);
228 mutex_unlock(&sessions_mutex
);
233 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
235 struct lttng_counter_transport
*transport
;
237 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
238 if (!strcmp(transport
->name
, name
))
244 struct lttng_counter
*lttng_kernel_counter_create(
245 const char *counter_transport_name
,
246 size_t number_dimensions
, const size_t *dimensions_sizes
)
248 struct lttng_counter
*counter
= NULL
;
249 struct lttng_counter_transport
*counter_transport
= NULL
;
251 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
252 if (!counter_transport
) {
253 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
254 counter_transport_name
);
257 if (!try_module_get(counter_transport
->owner
)) {
258 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
262 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
266 /* Create event notifier error counter. */
267 counter
->ops
= &counter_transport
->ops
;
268 counter
->transport
= counter_transport
;
270 counter
->counter
= counter
->ops
->counter_create(
271 number_dimensions
, dimensions_sizes
, 0);
272 if (!counter
->counter
) {
279 lttng_kvfree(counter
);
281 if (counter_transport
)
282 module_put(counter_transport
->owner
);
287 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
289 struct lttng_transport
*transport
= NULL
;
290 struct lttng_event_notifier_group
*event_notifier_group
;
291 const char *transport_name
= "relay-event-notifier";
292 size_t subbuf_size
= 4096; //TODO
293 size_t num_subbuf
= 16; //TODO
294 unsigned int switch_timer_interval
= 0;
295 unsigned int read_timer_interval
= 0;
298 mutex_lock(&sessions_mutex
);
300 transport
= lttng_transport_find(transport_name
);
302 printk(KERN_WARNING
"LTTng: transport %s not found\n",
306 if (!try_module_get(transport
->owner
)) {
307 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
312 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
314 if (!event_notifier_group
)
318 * Initialize the ring buffer used to store event notifier
321 event_notifier_group
->ops
= &transport
->ops
;
322 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
323 transport_name
, event_notifier_group
, NULL
,
324 subbuf_size
, num_subbuf
, switch_timer_interval
,
325 read_timer_interval
);
326 if (!event_notifier_group
->chan
)
329 event_notifier_group
->transport
= transport
;
331 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
332 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
333 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
334 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
336 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
338 mutex_unlock(&sessions_mutex
);
340 return event_notifier_group
;
343 lttng_kvfree(event_notifier_group
);
346 module_put(transport
->owner
);
348 mutex_unlock(&sessions_mutex
);
352 void metadata_cache_destroy(struct kref
*kref
)
354 struct lttng_metadata_cache
*cache
=
355 container_of(kref
, struct lttng_metadata_cache
, refcount
);
360 void lttng_session_destroy(struct lttng_kernel_session
*session
)
362 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
363 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
364 struct lttng_metadata_stream
*metadata_stream
;
365 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
368 mutex_lock(&sessions_mutex
);
369 WRITE_ONCE(session
->active
, 0);
370 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
371 ret
= lttng_syscalls_unregister_channel(chan_priv
->pub
);
374 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
)
375 _lttng_event_unregister(event_recorder_priv
->pub
);
376 synchronize_trace(); /* Wait for in-flight events to complete */
377 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
378 ret
= lttng_syscalls_destroy_event(chan_priv
->pub
);
381 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
382 &session
->priv
->enablers_head
, node
)
383 lttng_event_enabler_destroy(event_enabler
);
384 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, node
)
385 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
386 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
387 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
388 _lttng_channel_destroy(chan_priv
->pub
);
390 mutex_lock(&session
->priv
->metadata_cache
->lock
);
391 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
392 _lttng_metadata_channel_hangup(metadata_stream
);
393 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
394 lttng_id_tracker_fini(&session
->pid_tracker
);
395 lttng_id_tracker_fini(&session
->vpid_tracker
);
396 lttng_id_tracker_fini(&session
->uid_tracker
);
397 lttng_id_tracker_fini(&session
->vuid_tracker
);
398 lttng_id_tracker_fini(&session
->gid_tracker
);
399 lttng_id_tracker_fini(&session
->vgid_tracker
);
400 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
401 list_del(&session
->priv
->list
);
402 mutex_unlock(&sessions_mutex
);
403 lttng_kvfree(session
->priv
);
404 lttng_kvfree(session
);
407 void lttng_event_notifier_group_destroy(
408 struct lttng_event_notifier_group
*event_notifier_group
)
410 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
411 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
414 if (!event_notifier_group
)
417 mutex_lock(&sessions_mutex
);
419 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
422 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
423 &event_notifier_group
->event_notifiers_head
, node
)
424 _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
426 /* Wait for in-flight event notifier to complete */
429 irq_work_sync(&event_notifier_group
->wakeup_pending
);
431 kfree(event_notifier_group
->sc_filter
);
433 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
434 &event_notifier_group
->enablers_head
, node
)
435 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
437 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
438 &event_notifier_group
->event_notifiers_head
, node
)
439 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
441 if (event_notifier_group
->error_counter
) {
442 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
444 error_counter
->ops
->counter_destroy(error_counter
->counter
);
445 module_put(error_counter
->transport
->owner
);
446 lttng_kvfree(error_counter
);
447 event_notifier_group
->error_counter
= NULL
;
450 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
451 module_put(event_notifier_group
->transport
->owner
);
452 list_del(&event_notifier_group
->node
);
454 mutex_unlock(&sessions_mutex
);
455 lttng_kvfree(event_notifier_group
);
458 int lttng_session_statedump(struct lttng_kernel_session
*session
)
462 mutex_lock(&sessions_mutex
);
463 ret
= lttng_statedump_start(session
);
464 mutex_unlock(&sessions_mutex
);
468 int lttng_session_enable(struct lttng_kernel_session
*session
)
471 struct lttng_kernel_channel_buffer_private
*chan_priv
;
473 mutex_lock(&sessions_mutex
);
474 if (session
->active
) {
479 /* Set transient enabler state to "enabled" */
480 session
->priv
->tstate
= 1;
482 /* We need to sync enablers with session before activation. */
483 lttng_session_sync_event_enablers(session
);
486 * Snapshot the number of events per channel to know the type of header
489 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
490 if (chan_priv
->header_type
)
491 continue; /* don't change it if session stop/restart */
492 if (chan_priv
->free_event_id
< 31)
493 chan_priv
->header_type
= 1; /* compact */
495 chan_priv
->header_type
= 2; /* large */
498 /* Clear each stream's quiescent state. */
499 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
500 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
501 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
504 WRITE_ONCE(session
->active
, 1);
505 WRITE_ONCE(session
->priv
->been_active
, 1);
506 ret
= _lttng_session_metadata_statedump(session
);
508 WRITE_ONCE(session
->active
, 0);
511 ret
= lttng_statedump_start(session
);
513 WRITE_ONCE(session
->active
, 0);
515 mutex_unlock(&sessions_mutex
);
519 int lttng_session_disable(struct lttng_kernel_session
*session
)
522 struct lttng_kernel_channel_buffer_private
*chan_priv
;
524 mutex_lock(&sessions_mutex
);
525 if (!session
->active
) {
529 WRITE_ONCE(session
->active
, 0);
531 /* Set transient enabler state to "disabled" */
532 session
->priv
->tstate
= 0;
533 lttng_session_sync_event_enablers(session
);
535 /* Set each stream's quiescent state. */
536 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
537 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
538 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
541 mutex_unlock(&sessions_mutex
);
545 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
548 struct lttng_kernel_channel_buffer_private
*chan_priv
;
549 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
550 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
551 struct lttng_metadata_stream
*stream
;
553 mutex_lock(&sessions_mutex
);
554 if (!session
->active
) {
559 mutex_lock(&cache
->lock
);
560 memset(cache
->data
, 0, cache
->cache_alloc
);
561 cache
->metadata_written
= 0;
563 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
564 stream
->metadata_out
= 0;
565 stream
->metadata_in
= 0;
567 mutex_unlock(&cache
->lock
);
569 session
->priv
->metadata_dumped
= 0;
570 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
571 chan_priv
->metadata_dumped
= 0;
574 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
575 event_recorder_priv
->metadata_dumped
= 0;
578 ret
= _lttng_session_metadata_statedump(session
);
581 mutex_unlock(&sessions_mutex
);
585 int lttng_channel_enable(struct lttng_kernel_channel_buffer
*channel
)
589 mutex_lock(&sessions_mutex
);
590 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
594 if (channel
->parent
.enabled
) {
598 /* Set transient enabler state to "enabled" */
599 channel
->priv
->parent
.tstate
= 1;
600 lttng_session_sync_event_enablers(channel
->parent
.session
);
601 /* Set atomically the state to "enabled" */
602 WRITE_ONCE(channel
->parent
.enabled
, 1);
604 mutex_unlock(&sessions_mutex
);
608 int lttng_channel_disable(struct lttng_kernel_channel_buffer
*channel
)
612 mutex_lock(&sessions_mutex
);
613 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
617 if (!channel
->parent
.enabled
) {
621 /* Set atomically the state to "disabled" */
622 WRITE_ONCE(channel
->parent
.enabled
, 0);
623 /* Set transient enabler state to "enabled" */
624 channel
->priv
->parent
.tstate
= 0;
625 lttng_session_sync_event_enablers(channel
->parent
.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_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
);
863 * Supports event creation while tracing session is active.
864 * Needs to be called with sessions mutex held.
866 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
867 struct lttng_kernel_abi_event
*event_param
,
868 const struct lttng_kernel_event_desc
*event_desc
,
869 enum lttng_kernel_abi_instrumentation itype
)
871 struct lttng_kernel_session
*session
= chan
->parent
.session
;
872 struct lttng_kernel_event_recorder
*event_recorder
;
873 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
874 const char *event_name
;
875 struct hlist_head
*head
;
878 if (chan
->priv
->free_event_id
== -1U) {
884 case LTTNG_KERNEL_ABI_TRACEPOINT
:
885 event_name
= event_desc
->event_name
;
888 case LTTNG_KERNEL_ABI_KPROBE
:
890 case LTTNG_KERNEL_ABI_UPROBE
:
892 case LTTNG_KERNEL_ABI_KRETPROBE
:
894 case LTTNG_KERNEL_ABI_SYSCALL
:
895 event_name
= event_param
->name
;
898 case LTTNG_KERNEL_ABI_FUNCTION
:
900 case LTTNG_KERNEL_ABI_NOOP
:
908 head
= utils_borrow_hash_table_bucket(session
->priv
->events_ht
.table
,
909 LTTNG_EVENT_HT_SIZE
, event_name
);
910 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
911 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
912 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
913 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
914 && chan
== event_recorder_priv
->pub
->chan
) {
920 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
921 if (!event_recorder
) {
925 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
926 if (!event_recorder_priv
) {
928 goto cache_private_error
;
930 event_recorder_priv
->pub
= event_recorder
;
931 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
932 event_recorder
->priv
= event_recorder_priv
;
933 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
934 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
936 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
937 event_recorder
->chan
= chan
;
938 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
939 event_recorder
->priv
->parent
.instrumentation
= itype
;
940 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
941 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
944 case LTTNG_KERNEL_ABI_TRACEPOINT
:
945 /* Event will be enabled by enabler sync. */
946 event_recorder
->parent
.enabled
= 0;
947 event_recorder
->priv
->parent
.registered
= 0;
948 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
949 if (!event_recorder
->priv
->parent
.desc
) {
953 /* Populate lttng_event structure before event registration. */
957 case LTTNG_KERNEL_ABI_KPROBE
:
959 * Needs to be explicitly enabled after creation, since
960 * we may want to apply filters.
962 event_recorder
->parent
.enabled
= 0;
963 event_recorder
->priv
->parent
.registered
= 1;
965 * Populate lttng_event structure before event
969 ret
= lttng_kprobes_register_event(event_name
,
970 event_param
->u
.kprobe
.symbol_name
,
971 event_param
->u
.kprobe
.offset
,
972 event_param
->u
.kprobe
.addr
,
978 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
982 case LTTNG_KERNEL_ABI_KRETPROBE
:
984 struct lttng_kernel_event_recorder
*event_recorder_return
;
985 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
987 /* kretprobe defines 2 events */
989 * Needs to be explicitly enabled after creation, since
990 * we may want to apply filters.
992 event_recorder
->parent
.enabled
= 0;
993 event_recorder
->priv
->parent
.registered
= 1;
995 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
996 if (!event_recorder_return
) {
1000 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
1001 if (!event_recorder_return_priv
) {
1002 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1004 goto register_error
;
1006 event_recorder_return_priv
->pub
= event_recorder_return
;
1007 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
1008 event_recorder_return
->priv
= event_recorder_return_priv
;
1009 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
1010 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
1012 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1013 event_recorder_return
->chan
= chan
;
1014 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
1015 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
1016 event_recorder_return
->parent
.enabled
= 0;
1017 event_recorder_return
->priv
->parent
.registered
= 1;
1018 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1019 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1021 * Populate lttng_event structure before kretprobe registration.
1024 ret
= lttng_kretprobes_register(event_name
,
1025 event_param
->u
.kretprobe
.symbol_name
,
1026 event_param
->u
.kretprobe
.offset
,
1027 event_param
->u
.kretprobe
.addr
,
1028 event_recorder
, event_recorder_return
);
1030 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1031 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1033 goto register_error
;
1035 /* Take 2 refs on the module: one per event. */
1036 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1038 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1040 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1041 event_recorder_return
);
1042 WARN_ON_ONCE(ret
> 0);
1044 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1045 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1046 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1047 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1048 goto statedump_error
;
1050 list_add(&event_recorder_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1054 case LTTNG_KERNEL_ABI_SYSCALL
:
1056 * Needs to be explicitly enabled after creation, since
1057 * we may want to apply filters.
1059 event_recorder
->parent
.enabled
= 0;
1060 event_recorder
->priv
->parent
.registered
= 0;
1061 event_recorder
->priv
->parent
.desc
= event_desc
;
1062 switch (event_param
->u
.syscall
.entryexit
) {
1063 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1065 goto register_error
;
1066 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1067 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1069 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1070 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1073 switch (event_param
->u
.syscall
.abi
) {
1074 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1076 goto register_error
;
1077 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1078 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1080 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1081 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1084 if (!event_recorder
->priv
->parent
.desc
) {
1086 goto register_error
;
1090 case LTTNG_KERNEL_ABI_UPROBE
:
1092 * Needs to be explicitly enabled after creation, since
1093 * we may want to apply filters.
1095 event_recorder
->parent
.enabled
= 0;
1096 event_recorder
->priv
->parent
.registered
= 1;
1099 * Populate lttng_event structure before event
1104 ret
= lttng_uprobes_register_event(event_param
->name
,
1105 event_param
->u
.uprobe
.fd
,
1108 goto register_error
;
1109 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1113 case LTTNG_KERNEL_ABI_FUNCTION
:
1115 case LTTNG_KERNEL_ABI_NOOP
:
1120 goto register_error
;
1122 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1123 WARN_ON_ONCE(ret
> 0);
1125 goto statedump_error
;
1127 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1128 list_add(&event_recorder
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1129 return event_recorder
;
1132 /* If a statedump error occurs, events will not be readable. */
1134 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1135 cache_private_error
:
1136 kmem_cache_free(event_recorder_cache
, event_recorder
);
1141 return ERR_PTR(ret
);
1144 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1145 const struct lttng_kernel_event_desc
*event_desc
,
1146 uint64_t token
, uint64_t error_counter_index
,
1147 struct lttng_event_notifier_group
*event_notifier_group
,
1148 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1149 enum lttng_kernel_abi_instrumentation itype
)
1151 struct lttng_kernel_event_notifier
*event_notifier
;
1152 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1153 struct lttng_counter
*error_counter
;
1154 const char *event_name
;
1155 struct hlist_head
*head
;
1159 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1160 event_name
= event_desc
->event_name
;
1163 case LTTNG_KERNEL_ABI_KPROBE
:
1165 case LTTNG_KERNEL_ABI_UPROBE
:
1167 case LTTNG_KERNEL_ABI_SYSCALL
:
1168 event_name
= event_notifier_param
->event
.name
;
1171 case LTTNG_KERNEL_ABI_KRETPROBE
:
1173 case LTTNG_KERNEL_ABI_FUNCTION
:
1175 case LTTNG_KERNEL_ABI_NOOP
:
1183 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1184 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1185 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1186 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1187 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1188 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1189 && event_notifier_group
== event_notifier_priv
->group
1190 && token
== event_notifier_priv
->parent
.user_token
) {
1196 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1197 if (!event_notifier
) {
1201 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1202 if (!event_notifier_priv
) {
1204 goto cache_private_error
;
1206 event_notifier_priv
->pub
= event_notifier
;
1207 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1208 event_notifier
->priv
= event_notifier_priv
;
1209 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1210 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1212 event_notifier
->priv
->group
= event_notifier_group
;
1213 event_notifier
->priv
->parent
.user_token
= token
;
1214 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1215 event_notifier
->priv
->num_captures
= 0;
1216 event_notifier
->priv
->parent
.instrumentation
= itype
;
1217 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1218 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1219 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1220 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1221 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1224 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1225 /* Event will be enabled by enabler sync. */
1226 event_notifier
->parent
.enabled
= 0;
1227 event_notifier
->priv
->parent
.registered
= 0;
1228 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1229 if (!event_notifier
->priv
->parent
.desc
) {
1231 goto register_error
;
1233 /* Populate lttng_event_notifier structure before event registration. */
1237 case LTTNG_KERNEL_ABI_KPROBE
:
1239 * Needs to be explicitly enabled after creation, since
1240 * we may want to apply filters.
1242 event_notifier
->parent
.enabled
= 0;
1243 event_notifier
->priv
->parent
.registered
= 1;
1245 * Populate lttng_event_notifier structure before event
1249 ret
= lttng_kprobes_register_event_notifier(
1250 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1251 event_notifier_param
->event
.u
.kprobe
.offset
,
1252 event_notifier_param
->event
.u
.kprobe
.addr
,
1256 goto register_error
;
1258 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1262 case LTTNG_KERNEL_ABI_SYSCALL
:
1264 * Needs to be explicitly enabled after creation, since
1265 * we may want to apply filters.
1267 event_notifier
->parent
.enabled
= 0;
1268 event_notifier
->priv
->parent
.registered
= 0;
1269 event_notifier
->priv
->parent
.desc
= event_desc
;
1270 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1271 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1273 goto register_error
;
1274 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1275 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1277 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1278 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1281 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1282 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1284 goto register_error
;
1285 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1286 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1288 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1289 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1293 if (!event_notifier
->priv
->parent
.desc
) {
1295 goto register_error
;
1299 case LTTNG_KERNEL_ABI_UPROBE
:
1301 * Needs to be explicitly enabled after creation, since
1302 * we may want to apply filters.
1304 event_notifier
->parent
.enabled
= 0;
1305 event_notifier
->priv
->parent
.registered
= 1;
1308 * Populate lttng_event_notifier structure before
1309 * event_notifier registration.
1313 ret
= lttng_uprobes_register_event_notifier(
1314 event_notifier_param
->event
.name
,
1315 event_notifier_param
->event
.u
.uprobe
.fd
,
1318 goto register_error
;
1319 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1323 case LTTNG_KERNEL_ABI_KRETPROBE
:
1325 case LTTNG_KERNEL_ABI_FUNCTION
:
1327 case LTTNG_KERNEL_ABI_NOOP
:
1332 goto register_error
;
1335 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1336 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1339 * Clear the error counter bucket. The sessiond keeps track of which
1340 * bucket is currently in use. We trust it. The session lock
1341 * synchronizes against concurrent creation of the error
1344 error_counter
= event_notifier_group
->error_counter
;
1345 if (error_counter
) {
1346 size_t dimension_index
[1];
1349 * Check that the index is within the boundary of the counter.
1351 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1352 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1353 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1355 goto register_error
;
1358 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1359 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1361 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1362 event_notifier
->priv
->error_counter_index
);
1363 goto register_error
;
1367 return event_notifier
;
1370 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1371 cache_private_error
:
1372 kmem_cache_free(event_notifier_cache
, event_notifier
);
1376 return ERR_PTR(ret
);
1379 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1380 const size_t *dim_indexes
, int32_t cpu
,
1381 int64_t *val
, bool *overflow
, bool *underflow
)
1383 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1384 cpu
, val
, overflow
, underflow
);
1387 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1388 const size_t *dim_indexes
, int64_t *val
,
1389 bool *overflow
, bool *underflow
)
1391 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1392 val
, overflow
, underflow
);
1395 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1396 const size_t *dim_indexes
)
1398 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1401 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
1402 struct lttng_kernel_abi_event
*event_param
,
1403 const struct lttng_kernel_event_desc
*event_desc
,
1404 enum lttng_kernel_abi_instrumentation itype
)
1406 struct lttng_kernel_event_recorder
*event
;
1408 mutex_lock(&sessions_mutex
);
1409 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1410 mutex_unlock(&sessions_mutex
);
1414 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1415 const struct lttng_kernel_event_desc
*event_desc
,
1416 uint64_t id
, uint64_t error_counter_index
,
1417 struct lttng_event_notifier_group
*event_notifier_group
,
1418 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1419 enum lttng_kernel_abi_instrumentation itype
)
1421 struct lttng_kernel_event_notifier
*event_notifier
;
1423 mutex_lock(&sessions_mutex
);
1424 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1425 error_counter_index
, event_notifier_group
,
1426 event_notifier_param
, itype
);
1427 mutex_unlock(&sessions_mutex
);
1428 return event_notifier
;
1431 /* Only used for tracepoints for now. */
1433 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1435 const struct lttng_kernel_event_desc
*desc
;
1438 WARN_ON_ONCE(event_recorder
->priv
->parent
.registered
);
1440 desc
= event_recorder
->priv
->parent
.desc
;
1441 switch (event_recorder
->priv
->parent
.instrumentation
) {
1442 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1443 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1444 desc
->tp_class
->probe_callback
,
1448 case LTTNG_KERNEL_ABI_SYSCALL
:
1449 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1452 case LTTNG_KERNEL_ABI_KPROBE
:
1454 case LTTNG_KERNEL_ABI_UPROBE
:
1456 case LTTNG_KERNEL_ABI_KRETPROBE
:
1460 case LTTNG_KERNEL_ABI_FUNCTION
:
1462 case LTTNG_KERNEL_ABI_NOOP
:
1468 event_recorder
->priv
->parent
.registered
= 1;
1472 * Only used internally at session destruction.
1475 void unregister_event(struct lttng_kernel_event_recorder
*event_recorder
)
1477 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1478 const struct lttng_kernel_event_desc
*desc
;
1481 WARN_ON_ONCE(!event_priv
->registered
);
1483 desc
= event_priv
->desc
;
1484 switch (event_priv
->instrumentation
) {
1485 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1486 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1487 event_priv
->desc
->tp_class
->probe_callback
,
1491 case LTTNG_KERNEL_ABI_KPROBE
:
1492 lttng_kprobes_unregister_event(event_recorder
);
1496 case LTTNG_KERNEL_ABI_KRETPROBE
:
1497 lttng_kretprobes_unregister(event_recorder
);
1501 case LTTNG_KERNEL_ABI_SYSCALL
:
1502 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1505 case LTTNG_KERNEL_ABI_NOOP
:
1509 case LTTNG_KERNEL_ABI_UPROBE
:
1510 lttng_uprobes_unregister_event(event_recorder
);
1514 case LTTNG_KERNEL_ABI_FUNCTION
:
1521 event_priv
->registered
= 0;
1525 void _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1527 if (event_recorder
->priv
->parent
.registered
)
1528 unregister_event(event_recorder
);
1531 /* Only used for tracepoints for now. */
1533 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1535 const struct lttng_kernel_event_desc
*desc
;
1538 WARN_ON_ONCE(event_notifier
->priv
->parent
.registered
);
1540 desc
= event_notifier
->priv
->parent
.desc
;
1541 switch (event_notifier
->priv
->parent
.instrumentation
) {
1542 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1543 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1544 desc
->tp_class
->probe_callback
,
1548 case LTTNG_KERNEL_ABI_SYSCALL
:
1549 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1552 case LTTNG_KERNEL_ABI_KPROBE
:
1554 case LTTNG_KERNEL_ABI_UPROBE
:
1558 case LTTNG_KERNEL_ABI_KRETPROBE
:
1560 case LTTNG_KERNEL_ABI_FUNCTION
:
1562 case LTTNG_KERNEL_ABI_NOOP
:
1568 event_notifier
->priv
->parent
.registered
= 1;
1572 int unregister_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1574 const struct lttng_kernel_event_desc
*desc
;
1577 WARN_ON_ONCE(!event_notifier
->priv
->parent
.registered
);
1579 desc
= event_notifier
->priv
->parent
.desc
;
1580 switch (event_notifier
->priv
->parent
.instrumentation
) {
1581 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1582 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1583 event_notifier
->priv
->parent
.desc
->tp_class
->probe_callback
,
1587 case LTTNG_KERNEL_ABI_KPROBE
:
1588 lttng_kprobes_unregister_event_notifier(event_notifier
);
1592 case LTTNG_KERNEL_ABI_UPROBE
:
1593 lttng_uprobes_unregister_event_notifier(event_notifier
);
1597 case LTTNG_KERNEL_ABI_SYSCALL
:
1598 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1601 case LTTNG_KERNEL_ABI_KRETPROBE
:
1603 case LTTNG_KERNEL_ABI_FUNCTION
:
1605 case LTTNG_KERNEL_ABI_NOOP
:
1611 event_notifier
->priv
->parent
.registered
= 0;
1616 void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
)
1618 if (event_notifier
->priv
->parent
.registered
)
1619 unregister_event_notifier(event_notifier
);
1623 * Only used internally at session destruction.
1626 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1628 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1629 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1631 lttng_free_event_filter_runtime(event
);
1632 /* Free event enabler refs */
1633 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1634 &event_priv
->enablers_ref_head
, node
)
1637 switch (event
->type
) {
1638 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1640 struct lttng_kernel_event_recorder
*event_recorder
=
1641 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1643 switch (event_priv
->instrumentation
) {
1644 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1645 lttng_event_desc_put(event_priv
->desc
);
1648 case LTTNG_KERNEL_ABI_KPROBE
:
1649 module_put(event_priv
->desc
->owner
);
1650 lttng_kprobes_destroy_event_private(event_recorder
);
1653 case LTTNG_KERNEL_ABI_KRETPROBE
:
1654 module_put(event_priv
->desc
->owner
);
1655 lttng_kretprobes_destroy_private(event_recorder
);
1658 case LTTNG_KERNEL_ABI_SYSCALL
:
1661 case LTTNG_KERNEL_ABI_UPROBE
:
1662 module_put(event_priv
->desc
->owner
);
1663 lttng_uprobes_destroy_event_private(event_recorder
);
1666 case LTTNG_KERNEL_ABI_FUNCTION
:
1668 case LTTNG_KERNEL_ABI_NOOP
:
1673 list_del(&event_recorder
->priv
->node
);
1674 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1675 kmem_cache_free(event_recorder_cache
, event_recorder
);
1678 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1680 struct lttng_kernel_event_notifier
*event_notifier
=
1681 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1683 switch (event_notifier
->priv
->parent
.instrumentation
) {
1684 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1685 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1688 case LTTNG_KERNEL_ABI_KPROBE
:
1689 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1690 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1693 case LTTNG_KERNEL_ABI_SYSCALL
:
1696 case LTTNG_KERNEL_ABI_UPROBE
:
1697 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1698 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1701 case LTTNG_KERNEL_ABI_KRETPROBE
:
1703 case LTTNG_KERNEL_ABI_FUNCTION
:
1705 case LTTNG_KERNEL_ABI_NOOP
:
1710 list_del(&event_notifier
->priv
->node
);
1711 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1712 kmem_cache_free(event_notifier_cache
, event_notifier
);
1720 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1721 enum tracker_type tracker_type
)
1723 switch (tracker_type
) {
1725 return &session
->pid_tracker
;
1727 return &session
->vpid_tracker
;
1729 return &session
->uid_tracker
;
1731 return &session
->vuid_tracker
;
1733 return &session
->gid_tracker
;
1735 return &session
->vgid_tracker
;
1742 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1743 enum tracker_type tracker_type
, int id
)
1745 struct lttng_kernel_id_tracker
*tracker
;
1748 tracker
= get_tracker(session
, tracker_type
);
1753 mutex_lock(&sessions_mutex
);
1755 /* track all ids: destroy tracker. */
1756 lttng_id_tracker_destroy(tracker
, true);
1759 ret
= lttng_id_tracker_add(tracker
, id
);
1761 mutex_unlock(&sessions_mutex
);
1765 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1766 enum tracker_type tracker_type
, int id
)
1768 struct lttng_kernel_id_tracker
*tracker
;
1771 tracker
= get_tracker(session
, tracker_type
);
1776 mutex_lock(&sessions_mutex
);
1778 /* untrack all ids: replace by empty tracker. */
1779 ret
= lttng_id_tracker_empty_set(tracker
);
1781 ret
= lttng_id_tracker_del(tracker
, id
);
1783 mutex_unlock(&sessions_mutex
);
1788 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1790 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1791 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1792 struct lttng_id_hash_node
*e
;
1795 mutex_lock(&sessions_mutex
);
1797 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1798 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1800 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1806 /* ID tracker disabled. */
1807 if (iter
>= *pos
&& iter
== 0) {
1808 return id_tracker_p
; /* empty tracker */
1816 /* Called with sessions_mutex held. */
1818 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1820 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1821 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1822 struct lttng_id_hash_node
*e
;
1827 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1828 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1830 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1831 if (iter
++ >= *ppos
)
1836 /* ID tracker disabled. */
1837 if (iter
>= *ppos
&& iter
== 0)
1838 return p
; /* empty tracker */
1847 void id_list_stop(struct seq_file
*m
, void *p
)
1849 mutex_unlock(&sessions_mutex
);
1853 int id_list_show(struct seq_file
*m
, void *p
)
1855 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1856 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1859 if (p
== id_tracker_p
) {
1860 /* Tracker disabled. */
1863 const struct lttng_id_hash_node
*e
= p
;
1865 id
= lttng_id_tracker_get_node_id(e
);
1867 switch (id_tracker
->priv
->tracker_type
) {
1869 seq_printf(m
, "process { pid = %d; };\n", id
);
1872 seq_printf(m
, "process { vpid = %d; };\n", id
);
1875 seq_printf(m
, "user { uid = %d; };\n", id
);
1878 seq_printf(m
, "user { vuid = %d; };\n", id
);
1881 seq_printf(m
, "group { gid = %d; };\n", id
);
1884 seq_printf(m
, "group { vgid = %d; };\n", id
);
1887 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1893 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1894 .start
= id_list_start
,
1895 .next
= id_list_next
,
1896 .stop
= id_list_stop
,
1897 .show
= id_list_show
,
1901 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1903 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1907 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1909 struct seq_file
*m
= file
->private_data
;
1910 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1913 WARN_ON_ONCE(!id_tracker
);
1914 ret
= seq_release(inode
, file
);
1916 fput(id_tracker
->priv
->session
->priv
->file
);
1920 const struct file_operations lttng_tracker_ids_list_fops
= {
1921 .owner
= THIS_MODULE
,
1922 .open
= lttng_tracker_ids_list_open
,
1924 .llseek
= seq_lseek
,
1925 .release
= lttng_tracker_ids_list_release
,
1928 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1929 enum tracker_type tracker_type
)
1931 struct file
*tracker_ids_list_file
;
1935 file_fd
= lttng_get_unused_fd();
1941 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1942 <tng_tracker_ids_list_fops
,
1944 if (IS_ERR(tracker_ids_list_file
)) {
1945 ret
= PTR_ERR(tracker_ids_list_file
);
1948 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1950 goto refcount_error
;
1952 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1955 m
= tracker_ids_list_file
->private_data
;
1957 m
->private = get_tracker(session
, tracker_type
);
1958 BUG_ON(!m
->private);
1959 fd_install(file_fd
, tracker_ids_list_file
);
1964 atomic_long_dec(&session
->priv
->file
->f_count
);
1966 fput(tracker_ids_list_file
);
1968 put_unused_fd(file_fd
);
1974 * Enabler management.
1977 int lttng_match_enabler_star_glob(const char *desc_name
,
1978 const char *pattern
)
1980 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1981 desc_name
, LTTNG_SIZE_MAX
))
1987 int lttng_match_enabler_name(const char *desc_name
,
1990 if (strcmp(desc_name
, name
))
1995 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1996 struct lttng_enabler
*enabler
)
1998 const char *desc_name
, *enabler_name
;
1999 bool compat
= false, entry
= false;
2001 enabler_name
= enabler
->event_param
.name
;
2002 switch (enabler
->event_param
.instrumentation
) {
2003 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2004 desc_name
= desc
->event_name
;
2005 switch (enabler
->format_type
) {
2006 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2007 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2008 case LTTNG_ENABLER_FORMAT_NAME
:
2009 return lttng_match_enabler_name(desc_name
, enabler_name
);
2015 case LTTNG_KERNEL_ABI_SYSCALL
:
2016 desc_name
= desc
->event_name
;
2017 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2018 desc_name
+= strlen("compat_");
2021 if (!strncmp(desc_name
, "syscall_exit_",
2022 strlen("syscall_exit_"))) {
2023 desc_name
+= strlen("syscall_exit_");
2024 } else if (!strncmp(desc_name
, "syscall_entry_",
2025 strlen("syscall_entry_"))) {
2026 desc_name
+= strlen("syscall_entry_");
2032 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2033 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2035 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2039 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2046 switch (enabler
->event_param
.u
.syscall
.abi
) {
2047 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2049 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2053 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2060 switch (enabler
->event_param
.u
.syscall
.match
) {
2061 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2062 switch (enabler
->format_type
) {
2063 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2064 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2065 case LTTNG_ENABLER_FORMAT_NAME
:
2066 return lttng_match_enabler_name(desc_name
, enabler_name
);
2071 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2072 return -EINVAL
; /* Not implemented. */
2085 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2086 struct lttng_kernel_event_recorder
*event_recorder
)
2088 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2091 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2093 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2094 && event_recorder
->chan
== event_enabler
->chan
)
2101 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2102 struct lttng_kernel_event_notifier
*event_notifier
)
2104 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2105 event_notifier_enabler
);
2107 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2109 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2110 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2111 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2118 struct lttng_enabler_ref
*lttng_enabler_ref(
2119 struct list_head
*enablers_ref_list
,
2120 struct lttng_enabler
*enabler
)
2122 struct lttng_enabler_ref
*enabler_ref
;
2124 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2125 if (enabler_ref
->ref
== enabler
)
2132 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2134 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2135 struct lttng_kernel_probe_desc
*probe_desc
;
2136 const struct lttng_kernel_event_desc
*desc
;
2138 struct list_head
*probe_list
;
2140 probe_list
= lttng_get_probe_list_head();
2142 * For each probe event, if we find that a probe event matches
2143 * our enabler, create an associated lttng_event if not
2146 list_for_each_entry(probe_desc
, probe_list
, head
) {
2147 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2149 struct hlist_head
*head
;
2150 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2151 struct lttng_kernel_event_recorder
*event_recorder
;
2153 desc
= probe_desc
->event_desc
[i
];
2154 if (!lttng_desc_match_enabler(desc
,
2155 lttng_event_enabler_as_enabler(event_enabler
)))
2159 * Check if already created.
2161 head
= utils_borrow_hash_table_bucket(
2162 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2164 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2165 if (event_recorder_private
->parent
.desc
== desc
2166 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2173 * We need to create an event for this
2176 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2177 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2178 if (!event_recorder
) {
2179 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2180 probe_desc
->event_desc
[i
]->event_name
);
2187 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2189 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2190 struct lttng_kernel_probe_desc
*probe_desc
;
2191 const struct lttng_kernel_event_desc
*desc
;
2193 struct list_head
*probe_list
;
2195 probe_list
= lttng_get_probe_list_head();
2197 * For each probe event, if we find that a probe event matches
2198 * our enabler, create an associated lttng_event_notifier if not
2201 list_for_each_entry(probe_desc
, probe_list
, head
) {
2202 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2204 struct hlist_head
*head
;
2205 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2206 struct lttng_kernel_event_notifier
*event_notifier
;
2208 desc
= probe_desc
->event_desc
[i
];
2209 if (!lttng_desc_match_enabler(desc
,
2210 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2214 * Check if already created.
2216 head
= utils_borrow_hash_table_bucket(
2217 event_notifier_group
->event_notifiers_ht
.table
,
2218 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2219 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2220 if (event_notifier_priv
->parent
.desc
== desc
2221 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2228 * We need to create a event_notifier for this event probe.
2230 event_notifier
= _lttng_event_notifier_create(desc
,
2231 event_notifier_enabler
->base
.user_token
,
2232 event_notifier_enabler
->error_counter_index
,
2233 event_notifier_group
, NULL
,
2234 LTTNG_KERNEL_ABI_TRACEPOINT
);
2235 if (IS_ERR(event_notifier
)) {
2236 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2237 probe_desc
->event_desc
[i
]->event_name
);
2244 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2248 ret
= lttng_syscalls_register_event(event_enabler
);
2253 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2257 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2259 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2264 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2265 * tracepoint probes.
2266 * Should be called with sessions mutex held.
2269 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2271 switch (event_enabler
->base
.event_param
.instrumentation
) {
2272 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2273 lttng_create_tracepoint_event_if_missing(event_enabler
);
2276 case LTTNG_KERNEL_ABI_SYSCALL
:
2277 lttng_create_syscall_event_if_missing(event_enabler
);
2287 * Create events associated with an event_enabler (if not already present),
2288 * and add backward reference from the event to the enabler.
2289 * Should be called with sessions mutex held.
2292 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2294 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2295 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2296 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2297 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2299 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2300 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2301 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2302 !strcmp(base_enabler
->event_param
.name
, "*")) {
2303 int enabled
= base_enabler
->enabled
;
2304 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2306 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2307 WRITE_ONCE(chan
->priv
->parent
.syscall_all_entry
, enabled
);
2309 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2310 WRITE_ONCE(chan
->priv
->parent
.syscall_all_exit
, enabled
);
2313 /* First ensure that probe events are created for this enabler. */
2314 lttng_create_event_if_missing(event_enabler
);
2316 /* For each event matching event_enabler in session event list. */
2317 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2318 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2319 struct lttng_enabler_ref
*enabler_ref
;
2321 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2323 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2324 lttng_event_enabler_as_enabler(event_enabler
));
2327 * If no backward ref, create it.
2328 * Add backward ref from event to event_enabler.
2330 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2333 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2334 list_add(&enabler_ref
->node
,
2335 &event_recorder_priv
->parent
.enablers_ref_head
);
2339 * Link filter bytecodes if not linked yet.
2341 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2343 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2344 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2350 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2351 * tracepoint probes.
2352 * Should be called with sessions mutex held.
2355 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2357 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2358 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2359 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2362 case LTTNG_KERNEL_ABI_SYSCALL
:
2363 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2373 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2376 int lttng_event_notifier_enabler_ref_event_notifiers(
2377 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2379 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2380 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2381 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2383 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2384 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2385 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2386 !strcmp(base_enabler
->event_param
.name
, "*")) {
2388 int enabled
= base_enabler
->enabled
;
2389 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2391 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2392 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2394 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2395 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2399 /* First ensure that probe event_notifiers are created for this enabler. */
2400 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2402 /* Link the created event_notifier with its associated enabler. */
2403 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2404 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2405 struct lttng_enabler_ref
*enabler_ref
;
2407 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2410 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2411 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2414 * If no backward ref, create it.
2415 * Add backward ref from event_notifier to enabler.
2417 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2421 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2422 event_notifier_enabler
);
2423 list_add(&enabler_ref
->node
,
2424 &event_notifier_priv
->parent
.enablers_ref_head
);
2428 * Link filter bytecodes if not linked yet.
2430 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2431 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2432 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2434 /* Link capture bytecodes if not linked yet. */
2435 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2436 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2437 &event_notifier_enabler
->capture_bytecode_head
);
2439 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2445 * Called at module load: connect the probe on all enablers matching
2447 * Called with sessions lock held.
2449 int lttng_fix_pending_events(void)
2451 struct lttng_kernel_session_private
*session_priv
;
2453 list_for_each_entry(session_priv
, &sessions
, list
)
2454 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2458 static bool lttng_event_notifier_group_has_active_event_notifiers(
2459 struct lttng_event_notifier_group
*event_notifier_group
)
2461 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2463 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2465 if (event_notifier_enabler
->base
.enabled
)
2471 bool lttng_event_notifier_active(void)
2473 struct lttng_event_notifier_group
*event_notifier_group
;
2475 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2476 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2482 int lttng_fix_pending_event_notifiers(void)
2484 struct lttng_event_notifier_group
*event_notifier_group
;
2486 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2487 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2491 struct lttng_event_enabler
*lttng_event_enabler_create(
2492 enum lttng_enabler_format_type format_type
,
2493 struct lttng_kernel_abi_event
*event_param
,
2494 struct lttng_kernel_channel_buffer
*chan
)
2496 struct lttng_event_enabler
*event_enabler
;
2498 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2501 event_enabler
->base
.format_type
= format_type
;
2502 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2503 memcpy(&event_enabler
->base
.event_param
, event_param
,
2504 sizeof(event_enabler
->base
.event_param
));
2505 event_enabler
->chan
= chan
;
2507 event_enabler
->base
.enabled
= 0;
2508 mutex_lock(&sessions_mutex
);
2509 list_add(&event_enabler
->node
, &event_enabler
->chan
->parent
.session
->priv
->enablers_head
);
2510 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2511 mutex_unlock(&sessions_mutex
);
2512 return event_enabler
;
2515 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2517 mutex_lock(&sessions_mutex
);
2518 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2519 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2520 mutex_unlock(&sessions_mutex
);
2524 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2526 mutex_lock(&sessions_mutex
);
2527 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2528 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2529 mutex_unlock(&sessions_mutex
);
2534 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2535 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2537 struct lttng_kernel_bytecode_node
*bytecode_node
;
2538 uint32_t bytecode_len
;
2541 ret
= get_user(bytecode_len
, &bytecode
->len
);
2544 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2548 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2549 sizeof(*bytecode
) + bytecode_len
);
2553 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2554 bytecode_node
->enabler
= enabler
;
2555 /* Enforce length based on allocated size */
2556 bytecode_node
->bc
.len
= bytecode_len
;
2557 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2562 lttng_kvfree(bytecode_node
);
2566 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2567 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2570 ret
= lttng_enabler_attach_filter_bytecode(
2571 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2575 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2582 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2583 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2586 switch (event
->priv
->instrumentation
) {
2587 case LTTNG_KERNEL_ABI_UPROBE
:
2588 return lttng_uprobes_event_add_callsite(event
, callsite
);
2595 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2597 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2599 /* Destroy filter bytecode */
2600 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2601 &enabler
->filter_bytecode_head
, node
) {
2602 lttng_kvfree(filter_node
);
2607 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2609 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2611 list_del(&event_enabler
->node
);
2612 kfree(event_enabler
);
2615 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2616 struct lttng_event_notifier_group
*event_notifier_group
,
2617 enum lttng_enabler_format_type format_type
,
2618 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2620 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2622 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2623 if (!event_notifier_enabler
)
2626 event_notifier_enabler
->base
.format_type
= format_type
;
2627 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2628 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2630 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2631 event_notifier_enabler
->num_captures
= 0;
2633 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2634 sizeof(event_notifier_enabler
->base
.event_param
));
2636 event_notifier_enabler
->base
.enabled
= 0;
2637 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2638 event_notifier_enabler
->group
= event_notifier_group
;
2640 mutex_lock(&sessions_mutex
);
2641 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2642 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2644 mutex_unlock(&sessions_mutex
);
2646 return event_notifier_enabler
;
2649 int lttng_event_notifier_enabler_enable(
2650 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2652 mutex_lock(&sessions_mutex
);
2653 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2654 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2655 mutex_unlock(&sessions_mutex
);
2659 int lttng_event_notifier_enabler_disable(
2660 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2662 mutex_lock(&sessions_mutex
);
2663 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2664 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2665 mutex_unlock(&sessions_mutex
);
2669 int lttng_event_notifier_enabler_attach_filter_bytecode(
2670 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2671 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2675 ret
= lttng_enabler_attach_filter_bytecode(
2676 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2681 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2688 int lttng_event_notifier_enabler_attach_capture_bytecode(
2689 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2690 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2692 struct lttng_kernel_bytecode_node
*bytecode_node
;
2693 struct lttng_enabler
*enabler
=
2694 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2695 uint32_t bytecode_len
;
2698 ret
= get_user(bytecode_len
, &bytecode
->len
);
2702 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2707 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2708 sizeof(*bytecode
) + bytecode_len
);
2712 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2713 bytecode_node
->enabler
= enabler
;
2715 /* Enforce length based on allocated size */
2716 bytecode_node
->bc
.len
= bytecode_len
;
2717 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2719 event_notifier_enabler
->num_captures
++;
2721 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2725 lttng_kvfree(bytecode_node
);
2731 void lttng_event_notifier_enabler_destroy(
2732 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2734 if (!event_notifier_enabler
) {
2738 list_del(&event_notifier_enabler
->node
);
2740 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2741 kfree(event_notifier_enabler
);
2745 * lttng_session_sync_event_enablers should be called just before starting a
2747 * Should be called with sessions mutex held.
2750 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2752 struct lttng_event_enabler
*event_enabler
;
2753 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2755 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2756 lttng_event_enabler_ref_events(event_enabler
);
2758 * For each event, if at least one of its enablers is enabled,
2759 * and its channel and session transient states are enabled, we
2760 * enable the event, else we disable it.
2762 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2763 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2764 struct lttng_enabler_ref
*enabler_ref
;
2765 struct lttng_kernel_bytecode_runtime
*runtime
;
2766 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2769 switch (event_recorder_priv
->parent
.instrumentation
) {
2770 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2772 case LTTNG_KERNEL_ABI_SYSCALL
:
2774 list_for_each_entry(enabler_ref
,
2775 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2776 if (enabler_ref
->ref
->enabled
) {
2784 /* Not handled with lazy sync. */
2788 * Enabled state is based on union of enablers, with
2789 * intesection of session and channel transient enable
2792 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2794 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2796 * Sync tracepoint registration with event enabled
2800 if (!event_recorder_priv
->parent
.registered
)
2801 register_event(event_recorder
);
2803 if (event_recorder_priv
->parent
.registered
)
2804 _lttng_event_unregister(event_recorder
);
2807 /* Check if has enablers without bytecode enabled */
2808 list_for_each_entry(enabler_ref
,
2809 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2810 if (enabler_ref
->ref
->enabled
2811 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2812 has_enablers_without_filter_bytecode
= 1;
2816 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2817 has_enablers_without_filter_bytecode
;
2819 /* Enable filters */
2820 list_for_each_entry(runtime
,
2821 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2822 lttng_bytecode_sync_state(runtime
);
2825 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2826 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2831 * Apply enablers to session events, adding events to session if need
2832 * be. It is required after each modification applied to an active
2833 * session, and right before session "start".
2834 * "lazy" sync means we only sync if required.
2835 * Should be called with sessions mutex held.
2838 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2840 /* We can skip if session is not active */
2841 if (!session
->active
)
2843 lttng_session_sync_event_enablers(session
);
2847 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2849 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2850 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2852 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2853 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2856 * For each event_notifier, if at least one of its enablers is enabled,
2857 * we enable the event_notifier, else we disable it.
2859 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2860 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2861 struct lttng_enabler_ref
*enabler_ref
;
2862 struct lttng_kernel_bytecode_runtime
*runtime
;
2863 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2864 int nr_filters
= 0, nr_captures
= 0;
2866 switch (event_notifier_priv
->parent
.instrumentation
) {
2867 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2869 case LTTNG_KERNEL_ABI_SYSCALL
:
2870 /* Enable event_notifiers */
2871 list_for_each_entry(enabler_ref
,
2872 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2873 if (enabler_ref
->ref
->enabled
) {
2881 /* Not handled with sync. */
2885 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2887 * Sync tracepoint registration with event_notifier enabled
2891 if (!event_notifier_priv
->parent
.registered
)
2892 register_event_notifier(event_notifier
);
2894 if (event_notifier_priv
->parent
.registered
)
2895 unregister_event_notifier(event_notifier
);
2898 /* Check if has enablers without bytecode enabled */
2899 list_for_each_entry(enabler_ref
,
2900 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2901 if (enabler_ref
->ref
->enabled
2902 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2903 has_enablers_without_filter_bytecode
= 1;
2907 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2908 has_enablers_without_filter_bytecode
;
2910 /* Enable filters */
2911 list_for_each_entry(runtime
,
2912 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2913 lttng_bytecode_sync_state(runtime
);
2916 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2917 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2919 /* Enable captures */
2920 list_for_each_entry(runtime
,
2921 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2922 lttng_bytecode_sync_state(runtime
);
2925 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2930 * Serialize at most one packet worth of metadata into a metadata
2932 * We grab the metadata cache mutex to get exclusive access to our metadata
2933 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2934 * allows us to do racy operations such as looking for remaining space left in
2935 * packet and write, since mutual exclusion protects us from concurrent writes.
2936 * Mutual exclusion on the metadata cache allow us to read the cache content
2937 * without racing against reallocation of the cache by updates.
2938 * Returns the number of bytes written in the channel, 0 if no data
2939 * was written and a negative value on error.
2941 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2942 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2944 struct lttng_kernel_ring_buffer_ctx ctx
;
2946 size_t len
, reserve_len
;
2949 * Ensure we support mutiple get_next / put sequences followed by
2950 * put_next. The metadata cache lock protects reading the metadata
2951 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2952 * "flush" operations on the buffer invoked by different processes.
2953 * Moreover, since the metadata cache memory can be reallocated, we
2954 * need to have exclusive access against updates even though we only
2957 mutex_lock(&stream
->metadata_cache
->lock
);
2958 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2959 if (stream
->metadata_in
!= stream
->metadata_out
)
2962 /* Metadata regenerated, change the version. */
2963 if (stream
->metadata_cache
->version
!= stream
->version
)
2964 stream
->version
= stream
->metadata_cache
->version
;
2966 len
= stream
->metadata_cache
->metadata_written
-
2967 stream
->metadata_in
;
2970 reserve_len
= min_t(size_t,
2971 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2973 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2974 sizeof(char), NULL
);
2976 * If reservation failed, return an error to the caller.
2978 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2980 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2981 stream
->coherent
= false;
2984 stream
->transport
->ops
.event_write(&ctx
,
2985 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2987 stream
->transport
->ops
.event_commit(&ctx
);
2988 stream
->metadata_in
+= reserve_len
;
2989 if (reserve_len
< len
)
2990 stream
->coherent
= false;
2992 stream
->coherent
= true;
2997 *coherent
= stream
->coherent
;
2998 mutex_unlock(&stream
->metadata_cache
->lock
);
3003 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
3005 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
3006 mutex_lock(&session
->priv
->metadata_cache
->lock
);
3010 void lttng_metadata_end(struct lttng_kernel_session
*session
)
3012 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3013 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
3014 struct lttng_metadata_stream
*stream
;
3016 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
3017 wake_up_interruptible(&stream
->read_wait
);
3018 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
3023 * Write the metadata to the metadata cache.
3024 * Must be called with sessions_mutex held.
3025 * The metadata cache lock protects us from concurrent read access from
3026 * thread outputting metadata content to ring buffer.
3027 * The content of the printf is printed as a single atomic metadata
3030 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3031 const char *fmt
, ...)
3037 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3040 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3046 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3047 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3048 session
->priv
->metadata_cache
->cache_alloc
) {
3049 char *tmp_cache_realloc
;
3050 unsigned int tmp_cache_alloc_size
;
3052 tmp_cache_alloc_size
= max_t(unsigned int,
3053 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3054 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3055 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3056 if (!tmp_cache_realloc
)
3058 if (session
->priv
->metadata_cache
->data
) {
3059 memcpy(tmp_cache_realloc
,
3060 session
->priv
->metadata_cache
->data
,
3061 session
->priv
->metadata_cache
->cache_alloc
);
3062 vfree(session
->priv
->metadata_cache
->data
);
3065 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3066 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3068 memcpy(session
->priv
->metadata_cache
->data
+
3069 session
->priv
->metadata_cache
->metadata_written
,
3071 session
->priv
->metadata_cache
->metadata_written
+= len
;
3082 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3086 for (i
= 0; i
< nesting
; i
++) {
3089 ret
= lttng_metadata_printf(session
, " ");
3098 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3099 const struct lttng_kernel_event_field
*field
,
3102 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3106 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3107 const struct lttng_kernel_type_integer
*type
,
3108 enum lttng_kernel_string_encoding parent_encoding
,
3113 ret
= print_tabs(session
, nesting
);
3116 ret
= lttng_metadata_printf(session
,
3117 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3121 (parent_encoding
== lttng_kernel_string_encoding_none
)
3123 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3127 #if __BYTE_ORDER == __BIG_ENDIAN
3128 type
->reverse_byte_order
? " byte_order = le;" : ""
3130 type
->reverse_byte_order
? " byte_order = be;" : ""
3137 * Must be called with sessions_mutex held.
3140 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3141 const struct lttng_kernel_type_struct
*type
,
3144 const char *prev_field_name
= NULL
;
3146 uint32_t i
, nr_fields
;
3147 unsigned int alignment
;
3149 ret
= print_tabs(session
, nesting
);
3152 ret
= lttng_metadata_printf(session
,
3156 nr_fields
= type
->nr_fields
;
3157 for (i
= 0; i
< nr_fields
; i
++) {
3158 const struct lttng_kernel_event_field
*iter_field
;
3160 iter_field
= type
->fields
[i
];
3161 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3165 ret
= print_tabs(session
, nesting
);
3168 alignment
= type
->alignment
;
3170 ret
= lttng_metadata_printf(session
,
3174 ret
= lttng_metadata_printf(session
,
3181 * Must be called with sessions_mutex held.
3184 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3185 const struct lttng_kernel_event_field
*field
,
3190 ret
= _lttng_struct_type_statedump(session
,
3191 lttng_kernel_get_type_struct(field
->type
), nesting
);
3194 return lttng_field_name_statedump(session
, field
, nesting
);
3198 * Must be called with sessions_mutex held.
3201 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3202 const struct lttng_kernel_type_variant
*type
,
3204 const char *prev_field_name
)
3206 const char *tag_name
;
3208 uint32_t i
, nr_choices
;
3210 tag_name
= type
->tag_name
;
3212 tag_name
= prev_field_name
;
3216 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3218 if (type
->alignment
!= 0)
3220 ret
= print_tabs(session
, nesting
);
3223 ret
= lttng_metadata_printf(session
,
3224 "variant <_%s> {\n",
3228 nr_choices
= type
->nr_choices
;
3229 for (i
= 0; i
< nr_choices
; i
++) {
3230 const struct lttng_kernel_event_field
*iter_field
;
3232 iter_field
= type
->choices
[i
];
3233 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3237 ret
= print_tabs(session
, nesting
);
3240 ret
= lttng_metadata_printf(session
,
3246 * Must be called with sessions_mutex held.
3249 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3250 const struct lttng_kernel_event_field
*field
,
3252 const char *prev_field_name
)
3256 ret
= _lttng_variant_type_statedump(session
,
3257 lttng_kernel_get_type_variant(field
->type
), nesting
,
3261 return lttng_field_name_statedump(session
, field
, nesting
);
3265 * Must be called with sessions_mutex held.
3268 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3269 const struct lttng_kernel_event_field
*field
,
3273 const struct lttng_kernel_type_array
*array_type
;
3274 const struct lttng_kernel_type_common
*elem_type
;
3276 array_type
= lttng_kernel_get_type_array(field
->type
);
3277 WARN_ON_ONCE(!array_type
);
3279 if (array_type
->alignment
) {
3280 ret
= print_tabs(session
, nesting
);
3283 ret
= lttng_metadata_printf(session
,
3284 "struct { } align(%u) _%s_padding;\n",
3285 array_type
->alignment
* CHAR_BIT
,
3291 * Nested compound types: Only array of structures and variants are
3292 * currently supported.
3294 elem_type
= array_type
->elem_type
;
3295 switch (elem_type
->type
) {
3296 case lttng_kernel_type_integer
:
3297 case lttng_kernel_type_struct
:
3298 case lttng_kernel_type_variant
:
3299 ret
= _lttng_type_statedump(session
, elem_type
,
3300 array_type
->encoding
, nesting
);
3308 ret
= lttng_metadata_printf(session
,
3311 array_type
->length
);
3316 * Must be called with sessions_mutex held.
3319 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3320 const struct lttng_kernel_event_field
*field
,
3322 const char *prev_field_name
)
3325 const char *length_name
;
3326 const struct lttng_kernel_type_sequence
*sequence_type
;
3327 const struct lttng_kernel_type_common
*elem_type
;
3329 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3330 WARN_ON_ONCE(!sequence_type
);
3332 length_name
= sequence_type
->length_name
;
3334 length_name
= prev_field_name
;
3338 if (sequence_type
->alignment
) {
3339 ret
= print_tabs(session
, nesting
);
3342 ret
= lttng_metadata_printf(session
,
3343 "struct { } align(%u) _%s_padding;\n",
3344 sequence_type
->alignment
* CHAR_BIT
,
3351 * Nested compound types: Only array of structures and variants are
3352 * currently supported.
3354 elem_type
= sequence_type
->elem_type
;
3355 switch (elem_type
->type
) {
3356 case lttng_kernel_type_integer
:
3357 case lttng_kernel_type_struct
:
3358 case lttng_kernel_type_variant
:
3359 ret
= _lttng_type_statedump(session
, elem_type
,
3360 sequence_type
->encoding
, nesting
);
3368 ret
= lttng_metadata_printf(session
,
3376 * Must be called with sessions_mutex held.
3379 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3380 const struct lttng_kernel_type_enum
*type
,
3383 const struct lttng_kernel_enum_desc
*enum_desc
;
3384 const struct lttng_kernel_type_common
*container_type
;
3386 unsigned int i
, nr_entries
;
3388 container_type
= type
->container_type
;
3389 if (container_type
->type
!= lttng_kernel_type_integer
) {
3393 enum_desc
= type
->desc
;
3394 nr_entries
= enum_desc
->nr_entries
;
3396 ret
= print_tabs(session
, nesting
);
3399 ret
= lttng_metadata_printf(session
, "enum : ");
3402 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3403 lttng_kernel_string_encoding_none
, 0);
3406 ret
= lttng_metadata_printf(session
, " {\n");
3409 /* Dump all entries */
3410 for (i
= 0; i
< nr_entries
; i
++) {
3411 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3414 ret
= print_tabs(session
, nesting
+ 1);
3417 ret
= lttng_metadata_printf(session
,
3421 len
= strlen(entry
->string
);
3422 /* Escape the character '"' */
3423 for (j
= 0; j
< len
; j
++) {
3424 char c
= entry
->string
[j
];
3428 ret
= lttng_metadata_printf(session
,
3432 ret
= lttng_metadata_printf(session
,
3436 ret
= lttng_metadata_printf(session
,
3443 ret
= lttng_metadata_printf(session
, "\"");
3447 if (entry
->options
.is_auto
) {
3448 ret
= lttng_metadata_printf(session
, ",\n");
3452 ret
= lttng_metadata_printf(session
,
3456 if (entry
->start
.signedness
)
3457 ret
= lttng_metadata_printf(session
,
3458 "%lld", (long long) entry
->start
.value
);
3460 ret
= lttng_metadata_printf(session
,
3461 "%llu", entry
->start
.value
);
3464 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3466 == entry
->end
.value
) {
3467 ret
= lttng_metadata_printf(session
,
3470 if (entry
->end
.signedness
) {
3471 ret
= lttng_metadata_printf(session
,
3473 (long long) entry
->end
.value
);
3475 ret
= lttng_metadata_printf(session
,
3484 ret
= print_tabs(session
, nesting
);
3487 ret
= lttng_metadata_printf(session
, "}");
3493 * Must be called with sessions_mutex held.
3496 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3497 const struct lttng_kernel_event_field
*field
,
3501 const struct lttng_kernel_type_enum
*enum_type
;
3503 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3504 WARN_ON_ONCE(!enum_type
);
3505 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3508 return lttng_field_name_statedump(session
, field
, nesting
);
3512 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3513 const struct lttng_kernel_event_field
*field
,
3518 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3519 lttng_kernel_string_encoding_none
, nesting
);
3522 return lttng_field_name_statedump(session
, field
, nesting
);
3526 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3527 const struct lttng_kernel_type_string
*type
,
3532 /* Default encoding is UTF8 */
3533 ret
= print_tabs(session
, nesting
);
3536 ret
= lttng_metadata_printf(session
,
3538 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3539 " { encoding = ASCII; }" : "");
3544 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3545 const struct lttng_kernel_event_field
*field
,
3548 const struct lttng_kernel_type_string
*string_type
;
3551 string_type
= lttng_kernel_get_type_string(field
->type
);
3552 WARN_ON_ONCE(!string_type
);
3553 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3556 return lttng_field_name_statedump(session
, field
, nesting
);
3560 * Must be called with sessions_mutex held.
3563 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3564 const struct lttng_kernel_type_common
*type
,
3565 enum lttng_kernel_string_encoding parent_encoding
,
3570 switch (type
->type
) {
3571 case lttng_kernel_type_integer
:
3572 ret
= _lttng_integer_type_statedump(session
,
3573 lttng_kernel_get_type_integer(type
),
3574 parent_encoding
, nesting
);
3576 case lttng_kernel_type_enum
:
3577 ret
= _lttng_enum_type_statedump(session
,
3578 lttng_kernel_get_type_enum(type
),
3581 case lttng_kernel_type_string
:
3582 ret
= _lttng_string_type_statedump(session
,
3583 lttng_kernel_get_type_string(type
),
3586 case lttng_kernel_type_struct
:
3587 ret
= _lttng_struct_type_statedump(session
,
3588 lttng_kernel_get_type_struct(type
),
3591 case lttng_kernel_type_variant
:
3592 ret
= _lttng_variant_type_statedump(session
,
3593 lttng_kernel_get_type_variant(type
),
3597 /* Nested arrays and sequences are not supported yet. */
3598 case lttng_kernel_type_array
:
3599 case lttng_kernel_type_sequence
:
3608 * Must be called with sessions_mutex held.
3611 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3612 const struct lttng_kernel_event_field
*field
,
3614 const char **prev_field_name_p
)
3616 const char *prev_field_name
= NULL
;
3619 if (prev_field_name_p
)
3620 prev_field_name
= *prev_field_name_p
;
3621 switch (field
->type
->type
) {
3622 case lttng_kernel_type_integer
:
3623 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3625 case lttng_kernel_type_enum
:
3626 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3628 case lttng_kernel_type_string
:
3629 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3631 case lttng_kernel_type_struct
:
3632 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3634 case lttng_kernel_type_array
:
3635 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3637 case lttng_kernel_type_sequence
:
3638 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3640 case lttng_kernel_type_variant
:
3641 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3648 if (prev_field_name_p
)
3649 *prev_field_name_p
= field
->name
;
3654 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3655 struct lttng_kernel_ctx
*ctx
)
3657 const char *prev_field_name
= NULL
;
3663 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3664 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3666 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3674 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3675 struct lttng_kernel_event_recorder
*event_recorder
)
3677 const char *prev_field_name
= NULL
;
3678 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3682 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3683 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3685 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3693 * Must be called with sessions_mutex held.
3694 * The entire event metadata is printed as a single atomic metadata
3698 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3699 struct lttng_kernel_channel_buffer
*chan
,
3700 struct lttng_kernel_event_recorder
*event_recorder
)
3704 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3706 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3709 lttng_metadata_begin(session
);
3711 ret
= lttng_metadata_printf(session
,
3715 " stream_id = %u;\n",
3716 event_recorder
->priv
->parent
.desc
->event_name
,
3717 event_recorder
->priv
->id
,
3718 event_recorder
->chan
->priv
->id
);
3722 ret
= lttng_metadata_printf(session
,
3723 " fields := struct {\n"
3728 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3733 * LTTng space reservation can only reserve multiples of the
3736 ret
= lttng_metadata_printf(session
,
3742 event_recorder
->priv
->metadata_dumped
= 1;
3744 lttng_metadata_end(session
);
3750 * Must be called with sessions_mutex held.
3751 * The entire channel metadata is printed as a single atomic metadata
3755 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3756 struct lttng_kernel_channel_buffer
*chan
)
3760 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3763 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3766 lttng_metadata_begin(session
);
3768 WARN_ON_ONCE(!chan
->priv
->header_type
);
3769 ret
= lttng_metadata_printf(session
,
3772 " event.header := %s;\n"
3773 " packet.context := struct packet_context;\n",
3775 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3776 "struct event_header_large");
3780 if (chan
->priv
->ctx
) {
3781 ret
= lttng_metadata_printf(session
,
3782 " event.context := struct {\n");
3786 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3789 if (chan
->priv
->ctx
) {
3790 ret
= lttng_metadata_printf(session
,
3796 ret
= lttng_metadata_printf(session
,
3799 chan
->priv
->metadata_dumped
= 1;
3801 lttng_metadata_end(session
);
3806 * Must be called with sessions_mutex held.
3809 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3811 return lttng_metadata_printf(session
,
3812 "struct packet_context {\n"
3813 " uint64_clock_monotonic_t timestamp_begin;\n"
3814 " uint64_clock_monotonic_t timestamp_end;\n"
3815 " uint64_t content_size;\n"
3816 " uint64_t packet_size;\n"
3817 " uint64_t packet_seq_num;\n"
3818 " unsigned long events_discarded;\n"
3819 " uint32_t cpu_id;\n"
3826 * id: range: 0 - 30.
3827 * id 31 is reserved to indicate an extended header.
3830 * id: range: 0 - 65534.
3831 * id 65535 is reserved to indicate an extended header.
3833 * Must be called with sessions_mutex held.
3836 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3838 return lttng_metadata_printf(session
,
3839 "struct event_header_compact {\n"
3840 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3843 " uint27_clock_monotonic_t timestamp;\n"
3847 " uint64_clock_monotonic_t timestamp;\n"
3852 "struct event_header_large {\n"
3853 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3856 " uint32_clock_monotonic_t timestamp;\n"
3860 " uint64_clock_monotonic_t timestamp;\n"
3864 lttng_alignof(uint32_t) * CHAR_BIT
,
3865 lttng_alignof(uint16_t) * CHAR_BIT
3870 * Approximation of NTP time of day to clock monotonic correlation,
3871 * taken at start of trace.
3872 * Yes, this is only an approximation. Yes, we can (and will) do better
3873 * in future versions.
3874 * This function may return a negative offset. It may happen if the
3875 * system sets the REALTIME clock to 0 after boot.
3877 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3881 int64_t measure_clock_offset(void)
3883 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3884 uint64_t tcf
= trace_clock_freq();
3886 unsigned long flags
;
3887 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3888 struct timespec64 rts
= { 0, 0 };
3890 struct timespec rts
= { 0, 0 };
3893 /* Disable interrupts to increase correlation precision. */
3894 local_irq_save(flags
);
3895 monotonic
[0] = trace_clock_read64();
3896 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3897 ktime_get_real_ts64(&rts
);
3899 getnstimeofday(&rts
);
3901 monotonic
[1] = trace_clock_read64();
3902 local_irq_restore(flags
);
3904 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3905 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3906 if (tcf
== NSEC_PER_SEC
) {
3907 realtime
+= rts
.tv_nsec
;
3909 uint64_t n
= rts
.tv_nsec
* tcf
;
3911 do_div(n
, NSEC_PER_SEC
);
3914 offset
= (int64_t) realtime
- monotonic_avg
;
3919 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3927 while (cur
!= '\0') {
3930 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3934 ret
= lttng_metadata_printf(session
, "%c", '\\');
3937 /* We still print the current char */
3940 ret
= lttng_metadata_printf(session
, "%c", cur
);
3954 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3955 const char *field_value
)
3959 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3963 ret
= print_escaped_ctf_string(session
, field_value
);
3967 ret
= lttng_metadata_printf(session
, "\";\n");
3974 * Output metadata into this session's metadata buffers.
3975 * Must be called with sessions_mutex held.
3978 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3980 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3981 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3982 const char *product_uuid
;
3983 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3984 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3987 if (!LTTNG_READ_ONCE(session
->active
))
3990 lttng_metadata_begin(session
);
3992 if (session
->priv
->metadata_dumped
)
3995 snprintf(uuid_s
, sizeof(uuid_s
),
3996 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3997 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3998 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3999 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
4000 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
4002 ret
= lttng_metadata_printf(session
,
4003 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4004 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4005 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4006 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4007 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4008 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4009 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4015 " byte_order = %s;\n"
4016 " packet.header := struct {\n"
4017 " uint32_t magic;\n"
4018 " uint8_t uuid[16];\n"
4019 " uint32_t stream_id;\n"
4020 " uint64_t stream_instance_id;\n"
4023 lttng_alignof(uint8_t) * CHAR_BIT
,
4024 lttng_alignof(uint16_t) * CHAR_BIT
,
4025 lttng_alignof(uint32_t) * CHAR_BIT
,
4026 lttng_alignof(uint64_t) * CHAR_BIT
,
4027 sizeof(unsigned long) * CHAR_BIT
,
4028 lttng_alignof(unsigned long) * CHAR_BIT
,
4032 #if __BYTE_ORDER == __BIG_ENDIAN
4041 ret
= lttng_metadata_printf(session
,
4043 " hostname = \"%s\";\n"
4044 " domain = \"kernel\";\n"
4045 " sysname = \"%s\";\n"
4046 " kernel_release = \"%s\";\n"
4047 " kernel_version = \"%s\";\n"
4048 " tracer_name = \"lttng-modules\";\n"
4049 " tracer_major = %d;\n"
4050 " tracer_minor = %d;\n"
4051 " tracer_patchlevel = %d;\n"
4052 " trace_buffering_scheme = \"global\";\n",
4053 current
->nsproxy
->uts_ns
->name
.nodename
,
4057 LTTNG_MODULES_MAJOR_VERSION
,
4058 LTTNG_MODULES_MINOR_VERSION
,
4059 LTTNG_MODULES_PATCHLEVEL_VERSION
4064 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4067 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4068 session
->priv
->creation_time
);
4072 /* Add the product UUID to the 'env' section */
4073 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4075 ret
= lttng_metadata_printf(session
,
4076 " product_uuid = \"%s\";\n",
4083 /* Close the 'env' section */
4084 ret
= lttng_metadata_printf(session
, "};\n\n");
4088 ret
= lttng_metadata_printf(session
,
4090 " name = \"%s\";\n",
4096 if (!trace_clock_uuid(clock_uuid_s
)) {
4097 ret
= lttng_metadata_printf(session
,
4098 " uuid = \"%s\";\n",
4105 ret
= lttng_metadata_printf(session
,
4106 " description = \"%s\";\n"
4107 " freq = %llu; /* Frequency, in Hz */\n"
4108 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4111 trace_clock_description(),
4112 (unsigned long long) trace_clock_freq(),
4113 (long long) measure_clock_offset()
4118 ret
= lttng_metadata_printf(session
,
4119 "typealias integer {\n"
4120 " size = 27; align = 1; signed = false;\n"
4121 " map = clock.%s.value;\n"
4122 "} := uint27_clock_monotonic_t;\n"
4124 "typealias integer {\n"
4125 " size = 32; align = %u; signed = false;\n"
4126 " map = clock.%s.value;\n"
4127 "} := uint32_clock_monotonic_t;\n"
4129 "typealias integer {\n"
4130 " size = 64; align = %u; signed = false;\n"
4131 " map = clock.%s.value;\n"
4132 "} := uint64_clock_monotonic_t;\n\n",
4134 lttng_alignof(uint32_t) * CHAR_BIT
,
4136 lttng_alignof(uint64_t) * CHAR_BIT
,
4142 ret
= _lttng_stream_packet_context_declare(session
);
4146 ret
= _lttng_event_header_declare(session
);
4151 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4152 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4157 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4158 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4159 event_recorder_priv
->pub
);
4163 session
->priv
->metadata_dumped
= 1;
4165 lttng_metadata_end(session
);
4170 * lttng_transport_register - LTT transport registration
4171 * @transport: transport structure
4173 * Registers a transport which can be used as output to extract the data out of
4174 * LTTng. The module calling this registration function must ensure that no
4175 * trap-inducing code will be executed by the transport functions. E.g.
4176 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4177 * is made visible to the transport function. This registration acts as a
4178 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4179 * after its registration must it synchronize the TLBs.
4181 void lttng_transport_register(struct lttng_transport
*transport
)
4184 * Make sure no page fault can be triggered by the module about to be
4185 * registered. We deal with this here so we don't have to call
4186 * vmalloc_sync_mappings() in each module's init.
4188 wrapper_vmalloc_sync_mappings();
4190 mutex_lock(&sessions_mutex
);
4191 list_add_tail(&transport
->node
, <tng_transport_list
);
4192 mutex_unlock(&sessions_mutex
);
4194 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4197 * lttng_transport_unregister - LTT transport unregistration
4198 * @transport: transport structure
4200 void lttng_transport_unregister(struct lttng_transport
*transport
)
4202 mutex_lock(&sessions_mutex
);
4203 list_del(&transport
->node
);
4204 mutex_unlock(&sessions_mutex
);
4206 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4208 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4211 * Make sure no page fault can be triggered by the module about to be
4212 * registered. We deal with this here so we don't have to call
4213 * vmalloc_sync_mappings() in each module's init.
4215 wrapper_vmalloc_sync_mappings();
4217 mutex_lock(&sessions_mutex
);
4218 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4219 mutex_unlock(&sessions_mutex
);
4221 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4223 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4225 mutex_lock(&sessions_mutex
);
4226 list_del(&transport
->node
);
4227 mutex_unlock(&sessions_mutex
);
4229 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4231 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4233 enum cpuhp_state lttng_hp_prepare
;
4234 enum cpuhp_state lttng_hp_online
;
4236 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4238 struct lttng_cpuhp_node
*lttng_node
;
4240 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4241 switch (lttng_node
->component
) {
4242 case LTTNG_RING_BUFFER_FRONTEND
:
4244 case LTTNG_RING_BUFFER_BACKEND
:
4245 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4246 case LTTNG_RING_BUFFER_ITER
:
4248 case LTTNG_CONTEXT_PERF_COUNTERS
:
4255 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4257 struct lttng_cpuhp_node
*lttng_node
;
4259 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4260 switch (lttng_node
->component
) {
4261 case LTTNG_RING_BUFFER_FRONTEND
:
4262 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4263 case LTTNG_RING_BUFFER_BACKEND
:
4265 case LTTNG_RING_BUFFER_ITER
:
4267 case LTTNG_CONTEXT_PERF_COUNTERS
:
4268 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4274 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4276 struct lttng_cpuhp_node
*lttng_node
;
4278 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4279 switch (lttng_node
->component
) {
4280 case LTTNG_RING_BUFFER_FRONTEND
:
4281 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4282 case LTTNG_RING_BUFFER_BACKEND
:
4284 case LTTNG_RING_BUFFER_ITER
:
4285 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4286 case LTTNG_CONTEXT_PERF_COUNTERS
:
4287 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4293 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4295 struct lttng_cpuhp_node
*lttng_node
;
4297 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4298 switch (lttng_node
->component
) {
4299 case LTTNG_RING_BUFFER_FRONTEND
:
4300 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4301 case LTTNG_RING_BUFFER_BACKEND
:
4303 case LTTNG_RING_BUFFER_ITER
:
4305 case LTTNG_CONTEXT_PERF_COUNTERS
:
4312 static int __init
lttng_init_cpu_hotplug(void)
4316 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4317 lttng_hotplug_prepare
,
4318 lttng_hotplug_dead
);
4322 lttng_hp_prepare
= ret
;
4323 lttng_rb_set_hp_prepare(ret
);
4325 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4326 lttng_hotplug_online
,
4327 lttng_hotplug_offline
);
4329 cpuhp_remove_multi_state(lttng_hp_prepare
);
4330 lttng_hp_prepare
= 0;
4333 lttng_hp_online
= ret
;
4334 lttng_rb_set_hp_online(ret
);
4339 static void __exit
lttng_exit_cpu_hotplug(void)
4341 lttng_rb_set_hp_online(0);
4342 cpuhp_remove_multi_state(lttng_hp_online
);
4343 lttng_rb_set_hp_prepare(0);
4344 cpuhp_remove_multi_state(lttng_hp_prepare
);
4347 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4348 static int lttng_init_cpu_hotplug(void)
4352 static void lttng_exit_cpu_hotplug(void)
4355 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4357 static int __init
lttng_events_init(void)
4361 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4364 ret
= wrapper_get_pfnblock_flags_mask_init();
4367 ret
= wrapper_get_pageblock_flags_mask_init();
4370 ret
= wrapper_task_prio_init();
4373 ret
= lttng_probes_init();
4376 ret
= lttng_context_init();
4379 ret
= lttng_tracepoint_init();
4382 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4383 if (!event_recorder_cache
) {
4385 goto error_kmem_event_recorder
;
4387 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4388 if (!event_recorder_private_cache
) {
4390 goto error_kmem_event_recorder_private
;
4392 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4393 if (!event_notifier_cache
) {
4395 goto error_kmem_event_notifier
;
4397 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4398 if (!event_notifier_private_cache
) {
4400 goto error_kmem_event_notifier_private
;
4402 ret
= lttng_abi_init();
4405 ret
= lttng_logger_init();
4408 ret
= lttng_init_cpu_hotplug();
4411 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4412 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4413 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4414 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4415 LTTNG_MODULES_EXTRAVERSION
,
4417 #ifdef LTTNG_EXTRA_VERSION_GIT
4418 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4422 #ifdef LTTNG_EXTRA_VERSION_NAME
4423 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4427 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4428 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4429 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4433 lttng_logger_exit();
4437 kmem_cache_destroy(event_notifier_private_cache
);
4438 error_kmem_event_notifier_private
:
4439 kmem_cache_destroy(event_notifier_cache
);
4440 error_kmem_event_notifier
:
4441 kmem_cache_destroy(event_recorder_private_cache
);
4442 error_kmem_event_recorder_private
:
4443 kmem_cache_destroy(event_recorder_cache
);
4444 error_kmem_event_recorder
:
4445 lttng_tracepoint_exit();
4447 lttng_context_exit();
4448 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4449 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4450 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4451 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4452 LTTNG_MODULES_EXTRAVERSION
,
4454 #ifdef LTTNG_EXTRA_VERSION_GIT
4455 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4459 #ifdef LTTNG_EXTRA_VERSION_NAME
4460 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4467 module_init(lttng_events_init
);
4469 static void __exit
lttng_events_exit(void)
4471 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4473 lttng_exit_cpu_hotplug();
4474 lttng_logger_exit();
4476 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4477 lttng_session_destroy(session_priv
->pub
);
4478 kmem_cache_destroy(event_recorder_cache
);
4479 kmem_cache_destroy(event_recorder_private_cache
);
4480 kmem_cache_destroy(event_notifier_cache
);
4481 kmem_cache_destroy(event_notifier_private_cache
);
4482 lttng_tracepoint_exit();
4483 lttng_context_exit();
4484 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4485 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4486 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4487 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4488 LTTNG_MODULES_EXTRAVERSION
,
4490 #ifdef LTTNG_EXTRA_VERSION_GIT
4491 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4495 #ifdef LTTNG_EXTRA_VERSION_NAME
4496 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4502 module_exit(lttng_events_exit
);
4504 #include <generated/patches.h>
4505 #ifdef LTTNG_EXTRA_VERSION_GIT
4506 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4508 #ifdef LTTNG_EXTRA_VERSION_NAME
4509 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4511 MODULE_LICENSE("GPL and additional rights");
4512 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4513 MODULE_DESCRIPTION("LTTng tracer");
4514 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4515 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4516 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4517 LTTNG_MODULES_EXTRAVERSION
);