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 #include <linux/stdarg.h>
58 #define METADATA_CACHE_DEFAULT_SIZE 4096
60 static LIST_HEAD(sessions
);
61 static LIST_HEAD(event_notifier_groups
);
62 static LIST_HEAD(lttng_transport_list
);
63 static LIST_HEAD(lttng_counter_transport_list
);
65 * Protect the sessions and metadata caches.
67 static DEFINE_MUTEX(sessions_mutex
);
68 static struct kmem_cache
*event_recorder_cache
;
69 static struct kmem_cache
*event_recorder_private_cache
;
70 static struct kmem_cache
*event_notifier_cache
;
71 static struct kmem_cache
*event_notifier_private_cache
;
73 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
74 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
75 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
76 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
77 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
79 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
80 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
81 static void _lttng_event_unregister(struct lttng_kernel_event_recorder
*event
);
82 static void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
84 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
85 struct lttng_kernel_channel_buffer
*chan
,
86 struct lttng_kernel_event_recorder
*event
);
88 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
90 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
92 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
93 const struct lttng_kernel_type_common
*type
,
94 enum lttng_kernel_string_encoding parent_encoding
,
97 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
98 const struct lttng_kernel_event_field
*field
,
99 size_t nesting
, const char **prev_field_name_p
);
101 void synchronize_trace(void)
103 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
104 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
110 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
111 #ifdef CONFIG_PREEMPT_RT_FULL
114 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
115 #ifdef CONFIG_PREEMPT_RT
118 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
121 void lttng_lock_sessions(void)
123 mutex_lock(&sessions_mutex
);
126 void lttng_unlock_sessions(void)
128 mutex_unlock(&sessions_mutex
);
131 static struct lttng_transport
*lttng_transport_find(const char *name
)
133 struct lttng_transport
*transport
;
135 list_for_each_entry(transport
, <tng_transport_list
, node
) {
136 if (!strcmp(transport
->name
, name
))
143 * Called with sessions lock held.
145 int lttng_session_active(void)
147 struct lttng_kernel_session_private
*iter
;
149 list_for_each_entry(iter
, &sessions
, list
) {
150 if (iter
->pub
->active
)
156 struct lttng_kernel_session
*lttng_session_create(void)
158 struct lttng_kernel_session
*session
;
159 struct lttng_kernel_session_private
*session_priv
;
160 struct lttng_metadata_cache
*metadata_cache
;
163 mutex_lock(&sessions_mutex
);
164 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
167 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
169 goto err_free_session
;
170 session
->priv
= session_priv
;
171 session_priv
->pub
= session
;
173 INIT_LIST_HEAD(&session_priv
->chan
);
174 INIT_LIST_HEAD(&session_priv
->events
);
175 lttng_guid_gen(&session_priv
->uuid
);
177 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
180 goto err_free_session_private
;
181 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
182 if (!metadata_cache
->data
)
184 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
185 kref_init(&metadata_cache
->refcount
);
186 mutex_init(&metadata_cache
->lock
);
187 session_priv
->metadata_cache
= metadata_cache
;
188 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
189 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
190 sizeof(metadata_cache
->uuid
));
191 INIT_LIST_HEAD(&session_priv
->enablers_head
);
192 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
193 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
194 list_add(&session_priv
->list
, &sessions
);
196 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
197 goto tracker_alloc_error
;
198 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
199 goto tracker_alloc_error
;
200 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
201 goto tracker_alloc_error
;
202 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
203 goto tracker_alloc_error
;
204 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
205 goto tracker_alloc_error
;
206 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
207 goto tracker_alloc_error
;
209 mutex_unlock(&sessions_mutex
);
214 lttng_id_tracker_fini(&session
->pid_tracker
);
215 lttng_id_tracker_fini(&session
->vpid_tracker
);
216 lttng_id_tracker_fini(&session
->uid_tracker
);
217 lttng_id_tracker_fini(&session
->vuid_tracker
);
218 lttng_id_tracker_fini(&session
->gid_tracker
);
219 lttng_id_tracker_fini(&session
->vgid_tracker
);
221 kfree(metadata_cache
);
222 err_free_session_private
:
223 lttng_kvfree(session_priv
);
225 lttng_kvfree(session
);
227 mutex_unlock(&sessions_mutex
);
232 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
234 struct lttng_counter_transport
*transport
;
236 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
237 if (!strcmp(transport
->name
, name
))
243 struct lttng_counter
*lttng_kernel_counter_create(
244 const char *counter_transport_name
,
245 size_t number_dimensions
, const size_t *dimensions_sizes
)
247 struct lttng_counter
*counter
= NULL
;
248 struct lttng_counter_transport
*counter_transport
= NULL
;
250 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
251 if (!counter_transport
) {
252 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
253 counter_transport_name
);
256 if (!try_module_get(counter_transport
->owner
)) {
257 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
261 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
265 /* Create event notifier error counter. */
266 counter
->ops
= &counter_transport
->ops
;
267 counter
->transport
= counter_transport
;
269 counter
->counter
= counter
->ops
->counter_create(
270 number_dimensions
, dimensions_sizes
, 0);
271 if (!counter
->counter
) {
278 lttng_kvfree(counter
);
280 if (counter_transport
)
281 module_put(counter_transport
->owner
);
286 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
288 struct lttng_transport
*transport
= NULL
;
289 struct lttng_event_notifier_group
*event_notifier_group
;
290 const char *transport_name
= "relay-event-notifier";
291 size_t subbuf_size
= 4096; //TODO
292 size_t num_subbuf
= 16; //TODO
293 unsigned int switch_timer_interval
= 0;
294 unsigned int read_timer_interval
= 0;
297 mutex_lock(&sessions_mutex
);
299 transport
= lttng_transport_find(transport_name
);
301 printk(KERN_WARNING
"LTTng: transport %s not found\n",
305 if (!try_module_get(transport
->owner
)) {
306 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
311 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
313 if (!event_notifier_group
)
317 * Initialize the ring buffer used to store event notifier
320 event_notifier_group
->ops
= &transport
->ops
;
321 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
322 transport_name
, event_notifier_group
, NULL
,
323 subbuf_size
, num_subbuf
, switch_timer_interval
,
324 read_timer_interval
);
325 if (!event_notifier_group
->chan
)
328 event_notifier_group
->transport
= transport
;
330 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
331 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
332 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
333 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
335 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
337 mutex_unlock(&sessions_mutex
);
339 return event_notifier_group
;
342 lttng_kvfree(event_notifier_group
);
345 module_put(transport
->owner
);
347 mutex_unlock(&sessions_mutex
);
351 void metadata_cache_destroy(struct kref
*kref
)
353 struct lttng_metadata_cache
*cache
=
354 container_of(kref
, struct lttng_metadata_cache
, refcount
);
359 void lttng_session_destroy(struct lttng_kernel_session
*session
)
361 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
362 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
363 struct lttng_metadata_stream
*metadata_stream
;
364 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
367 mutex_lock(&sessions_mutex
);
368 WRITE_ONCE(session
->active
, 0);
369 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
370 ret
= lttng_syscalls_unregister_channel(chan_priv
->pub
);
373 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
)
374 _lttng_event_unregister(event_recorder_priv
->pub
);
375 synchronize_trace(); /* Wait for in-flight events to complete */
376 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
377 ret
= lttng_syscalls_destroy_event(chan_priv
->pub
);
380 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
381 &session
->priv
->enablers_head
, node
)
382 lttng_event_enabler_destroy(event_enabler
);
383 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, node
)
384 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
385 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
386 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
387 _lttng_channel_destroy(chan_priv
->pub
);
389 mutex_lock(&session
->priv
->metadata_cache
->lock
);
390 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
391 _lttng_metadata_channel_hangup(metadata_stream
);
392 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
393 lttng_id_tracker_fini(&session
->pid_tracker
);
394 lttng_id_tracker_fini(&session
->vpid_tracker
);
395 lttng_id_tracker_fini(&session
->uid_tracker
);
396 lttng_id_tracker_fini(&session
->vuid_tracker
);
397 lttng_id_tracker_fini(&session
->gid_tracker
);
398 lttng_id_tracker_fini(&session
->vgid_tracker
);
399 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
400 list_del(&session
->priv
->list
);
401 mutex_unlock(&sessions_mutex
);
402 lttng_kvfree(session
->priv
);
403 lttng_kvfree(session
);
406 void lttng_event_notifier_group_destroy(
407 struct lttng_event_notifier_group
*event_notifier_group
)
409 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
410 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
413 if (!event_notifier_group
)
416 mutex_lock(&sessions_mutex
);
418 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
421 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
422 &event_notifier_group
->event_notifiers_head
, node
)
423 _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
425 /* Wait for in-flight event notifier to complete */
428 irq_work_sync(&event_notifier_group
->wakeup_pending
);
430 kfree(event_notifier_group
->sc_filter
);
432 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
433 &event_notifier_group
->enablers_head
, node
)
434 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
436 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
437 &event_notifier_group
->event_notifiers_head
, node
)
438 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
440 if (event_notifier_group
->error_counter
) {
441 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
443 error_counter
->ops
->counter_destroy(error_counter
->counter
);
444 module_put(error_counter
->transport
->owner
);
445 lttng_kvfree(error_counter
);
446 event_notifier_group
->error_counter
= NULL
;
449 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
450 module_put(event_notifier_group
->transport
->owner
);
451 list_del(&event_notifier_group
->node
);
453 mutex_unlock(&sessions_mutex
);
454 lttng_kvfree(event_notifier_group
);
457 int lttng_session_statedump(struct lttng_kernel_session
*session
)
461 mutex_lock(&sessions_mutex
);
462 ret
= lttng_statedump_start(session
);
463 mutex_unlock(&sessions_mutex
);
467 int lttng_session_enable(struct lttng_kernel_session
*session
)
470 struct lttng_kernel_channel_buffer_private
*chan_priv
;
472 mutex_lock(&sessions_mutex
);
473 if (session
->active
) {
478 /* Set transient enabler state to "enabled" */
479 session
->priv
->tstate
= 1;
481 /* We need to sync enablers with session before activation. */
482 lttng_session_sync_event_enablers(session
);
485 * Snapshot the number of events per channel to know the type of header
488 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
489 if (chan_priv
->header_type
)
490 continue; /* don't change it if session stop/restart */
491 if (chan_priv
->free_event_id
< 31)
492 chan_priv
->header_type
= 1; /* compact */
494 chan_priv
->header_type
= 2; /* large */
497 /* Clear each stream's quiescent state. */
498 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
499 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
500 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
503 WRITE_ONCE(session
->active
, 1);
504 WRITE_ONCE(session
->priv
->been_active
, 1);
505 ret
= _lttng_session_metadata_statedump(session
);
507 WRITE_ONCE(session
->active
, 0);
510 ret
= lttng_statedump_start(session
);
512 WRITE_ONCE(session
->active
, 0);
514 mutex_unlock(&sessions_mutex
);
518 int lttng_session_disable(struct lttng_kernel_session
*session
)
521 struct lttng_kernel_channel_buffer_private
*chan_priv
;
523 mutex_lock(&sessions_mutex
);
524 if (!session
->active
) {
528 WRITE_ONCE(session
->active
, 0);
530 /* Set transient enabler state to "disabled" */
531 session
->priv
->tstate
= 0;
532 lttng_session_sync_event_enablers(session
);
534 /* Set each stream's quiescent state. */
535 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
536 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
537 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
540 mutex_unlock(&sessions_mutex
);
544 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
547 struct lttng_kernel_channel_buffer_private
*chan_priv
;
548 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
549 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
550 struct lttng_metadata_stream
*stream
;
552 mutex_lock(&sessions_mutex
);
553 if (!session
->active
) {
558 mutex_lock(&cache
->lock
);
559 memset(cache
->data
, 0, cache
->cache_alloc
);
560 cache
->metadata_written
= 0;
562 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
563 stream
->metadata_out
= 0;
564 stream
->metadata_in
= 0;
566 mutex_unlock(&cache
->lock
);
568 session
->priv
->metadata_dumped
= 0;
569 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
570 chan_priv
->metadata_dumped
= 0;
573 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
574 event_recorder_priv
->metadata_dumped
= 0;
577 ret
= _lttng_session_metadata_statedump(session
);
580 mutex_unlock(&sessions_mutex
);
584 int lttng_channel_enable(struct lttng_kernel_channel_buffer
*channel
)
588 mutex_lock(&sessions_mutex
);
589 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
593 if (channel
->parent
.enabled
) {
597 /* Set transient enabler state to "enabled" */
598 channel
->priv
->parent
.tstate
= 1;
599 lttng_session_sync_event_enablers(channel
->parent
.session
);
600 /* Set atomically the state to "enabled" */
601 WRITE_ONCE(channel
->parent
.enabled
, 1);
603 mutex_unlock(&sessions_mutex
);
607 int lttng_channel_disable(struct lttng_kernel_channel_buffer
*channel
)
611 mutex_lock(&sessions_mutex
);
612 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
616 if (!channel
->parent
.enabled
) {
620 /* Set atomically the state to "disabled" */
621 WRITE_ONCE(channel
->parent
.enabled
, 0);
622 /* Set transient enabler state to "enabled" */
623 channel
->priv
->parent
.tstate
= 0;
624 lttng_session_sync_event_enablers(channel
->parent
.session
);
626 mutex_unlock(&sessions_mutex
);
630 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
634 mutex_lock(&sessions_mutex
);
635 switch (event
->type
) {
636 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
638 struct lttng_kernel_event_recorder
*event_recorder
=
639 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
641 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
647 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
648 switch (event
->priv
->instrumentation
) {
649 case LTTNG_KERNEL_ABI_KRETPROBE
:
660 if (event
->enabled
) {
664 switch (event
->priv
->instrumentation
) {
665 case LTTNG_KERNEL_ABI_TRACEPOINT
:
667 case LTTNG_KERNEL_ABI_SYSCALL
:
671 case LTTNG_KERNEL_ABI_KPROBE
:
673 case LTTNG_KERNEL_ABI_UPROBE
:
674 WRITE_ONCE(event
->enabled
, 1);
677 case LTTNG_KERNEL_ABI_KRETPROBE
:
678 ret
= lttng_kretprobes_event_enable_state(event
, 1);
681 case LTTNG_KERNEL_ABI_FUNCTION
:
683 case LTTNG_KERNEL_ABI_NOOP
:
690 mutex_unlock(&sessions_mutex
);
694 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
698 mutex_lock(&sessions_mutex
);
699 switch (event
->type
) {
700 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
702 struct lttng_kernel_event_recorder
*event_recorder
=
703 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
705 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
711 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
712 switch (event
->priv
->instrumentation
) {
713 case LTTNG_KERNEL_ABI_KRETPROBE
:
724 if (!event
->enabled
) {
728 switch (event
->priv
->instrumentation
) {
729 case LTTNG_KERNEL_ABI_TRACEPOINT
:
731 case LTTNG_KERNEL_ABI_SYSCALL
:
735 case LTTNG_KERNEL_ABI_KPROBE
:
737 case LTTNG_KERNEL_ABI_UPROBE
:
738 WRITE_ONCE(event
->enabled
, 0);
741 case LTTNG_KERNEL_ABI_KRETPROBE
:
742 ret
= lttng_kretprobes_event_enable_state(event
, 0);
745 case LTTNG_KERNEL_ABI_FUNCTION
:
747 case LTTNG_KERNEL_ABI_NOOP
:
754 mutex_unlock(&sessions_mutex
);
758 struct lttng_kernel_channel_buffer
*lttng_channel_create(struct lttng_kernel_session
*session
,
759 const char *transport_name
,
761 size_t subbuf_size
, size_t num_subbuf
,
762 unsigned int switch_timer_interval
,
763 unsigned int read_timer_interval
,
764 enum channel_type channel_type
)
766 struct lttng_kernel_channel_buffer
*chan
;
767 struct lttng_kernel_channel_buffer_private
*chan_priv
;
768 struct lttng_transport
*transport
= NULL
;
770 mutex_lock(&sessions_mutex
);
771 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
772 goto active
; /* Refuse to add channel to active session */
773 transport
= lttng_transport_find(transport_name
);
775 printk(KERN_WARNING
"LTTng: transport %s not found\n",
779 if (!try_module_get(transport
->owner
)) {
780 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
783 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
786 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
789 chan
->priv
= chan_priv
;
790 chan_priv
->pub
= chan
;
791 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
792 chan
->parent
.session
= session
;
793 chan
->priv
->id
= session
->priv
->free_chan_id
++;
794 chan
->ops
= &transport
->ops
;
796 * Note: the channel creation op already writes into the packet
797 * headers. Therefore the "chan" information used as input
798 * should be already accessible.
800 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
801 chan
, buf_addr
, subbuf_size
, num_subbuf
,
802 switch_timer_interval
, read_timer_interval
);
803 if (!chan
->priv
->rb_chan
)
805 chan
->priv
->parent
.tstate
= 1;
806 chan
->parent
.enabled
= 1;
807 chan
->priv
->transport
= transport
;
808 chan
->priv
->channel_type
= channel_type
;
809 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
810 mutex_unlock(&sessions_mutex
);
819 module_put(transport
->owner
);
822 mutex_unlock(&sessions_mutex
);
827 * Only used internally at session destruction for per-cpu channels, and
828 * when metadata channel is released.
829 * Needs to be called with sessions mutex held.
832 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
834 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
835 module_put(chan
->priv
->transport
->owner
);
836 list_del(&chan
->priv
->node
);
837 lttng_kernel_destroy_context(chan
->priv
->ctx
);
842 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
844 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
846 /* Protect the metadata cache with the sessions_mutex. */
847 mutex_lock(&sessions_mutex
);
848 _lttng_channel_destroy(chan
);
849 mutex_unlock(&sessions_mutex
);
851 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
854 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
856 stream
->finalized
= 1;
857 wake_up_interruptible(&stream
->read_wait
);
862 * Supports event creation while tracing session is active.
863 * Needs to be called with sessions mutex held.
865 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
866 struct lttng_kernel_abi_event
*event_param
,
867 const struct lttng_kernel_event_desc
*event_desc
,
868 enum lttng_kernel_abi_instrumentation itype
)
870 struct lttng_kernel_session
*session
= chan
->parent
.session
;
871 struct lttng_kernel_event_recorder
*event_recorder
;
872 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
873 const char *event_name
;
874 struct hlist_head
*head
;
877 if (chan
->priv
->free_event_id
== -1U) {
883 case LTTNG_KERNEL_ABI_TRACEPOINT
:
884 event_name
= event_desc
->event_name
;
887 case LTTNG_KERNEL_ABI_KPROBE
:
889 case LTTNG_KERNEL_ABI_UPROBE
:
891 case LTTNG_KERNEL_ABI_KRETPROBE
:
893 case LTTNG_KERNEL_ABI_SYSCALL
:
894 event_name
= event_param
->name
;
897 case LTTNG_KERNEL_ABI_FUNCTION
:
899 case LTTNG_KERNEL_ABI_NOOP
:
907 head
= utils_borrow_hash_table_bucket(session
->priv
->events_ht
.table
,
908 LTTNG_EVENT_HT_SIZE
, event_name
);
909 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
910 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
911 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
912 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
913 && chan
== event_recorder_priv
->pub
->chan
) {
919 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
920 if (!event_recorder
) {
924 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
925 if (!event_recorder_priv
) {
927 goto cache_private_error
;
929 event_recorder_priv
->pub
= event_recorder
;
930 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
931 event_recorder
->priv
= event_recorder_priv
;
932 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
933 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
935 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
936 event_recorder
->chan
= chan
;
937 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
938 event_recorder
->priv
->parent
.instrumentation
= itype
;
939 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
940 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
943 case LTTNG_KERNEL_ABI_TRACEPOINT
:
944 /* Event will be enabled by enabler sync. */
945 event_recorder
->parent
.enabled
= 0;
946 event_recorder
->priv
->parent
.registered
= 0;
947 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
948 if (!event_recorder
->priv
->parent
.desc
) {
952 /* Populate lttng_event structure before event registration. */
956 case LTTNG_KERNEL_ABI_KPROBE
:
958 * Needs to be explicitly enabled after creation, since
959 * we may want to apply filters.
961 event_recorder
->parent
.enabled
= 0;
962 event_recorder
->priv
->parent
.registered
= 1;
964 * Populate lttng_event structure before event
968 ret
= lttng_kprobes_register_event(event_name
,
969 event_param
->u
.kprobe
.symbol_name
,
970 event_param
->u
.kprobe
.offset
,
971 event_param
->u
.kprobe
.addr
,
977 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
981 case LTTNG_KERNEL_ABI_KRETPROBE
:
983 struct lttng_kernel_event_recorder
*event_recorder_return
;
984 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
986 /* kretprobe defines 2 events */
988 * Needs to be explicitly enabled after creation, since
989 * we may want to apply filters.
991 event_recorder
->parent
.enabled
= 0;
992 event_recorder
->priv
->parent
.registered
= 1;
994 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
995 if (!event_recorder_return
) {
999 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
1000 if (!event_recorder_return_priv
) {
1001 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1003 goto register_error
;
1005 event_recorder_return_priv
->pub
= event_recorder_return
;
1006 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
1007 event_recorder_return
->priv
= event_recorder_return_priv
;
1008 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
1009 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
1011 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1012 event_recorder_return
->chan
= chan
;
1013 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
1014 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
1015 event_recorder_return
->parent
.enabled
= 0;
1016 event_recorder_return
->priv
->parent
.registered
= 1;
1017 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1018 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1020 * Populate lttng_event structure before kretprobe registration.
1023 ret
= lttng_kretprobes_register(event_name
,
1024 event_param
->u
.kretprobe
.symbol_name
,
1025 event_param
->u
.kretprobe
.offset
,
1026 event_param
->u
.kretprobe
.addr
,
1027 event_recorder
, event_recorder_return
);
1029 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1030 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1032 goto register_error
;
1034 /* Take 2 refs on the module: one per event. */
1035 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1037 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1039 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1040 event_recorder_return
);
1041 WARN_ON_ONCE(ret
> 0);
1043 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1044 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1045 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1046 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1047 goto statedump_error
;
1049 list_add(&event_recorder_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1053 case LTTNG_KERNEL_ABI_SYSCALL
:
1055 * Needs to be explicitly enabled after creation, since
1056 * we may want to apply filters.
1058 event_recorder
->parent
.enabled
= 0;
1059 event_recorder
->priv
->parent
.registered
= 0;
1060 event_recorder
->priv
->parent
.desc
= event_desc
;
1061 switch (event_param
->u
.syscall
.entryexit
) {
1062 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1064 goto register_error
;
1065 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1066 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1068 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1069 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1072 switch (event_param
->u
.syscall
.abi
) {
1073 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1075 goto register_error
;
1076 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1077 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1079 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1080 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1083 if (!event_recorder
->priv
->parent
.desc
) {
1085 goto register_error
;
1089 case LTTNG_KERNEL_ABI_UPROBE
:
1091 * Needs to be explicitly enabled after creation, since
1092 * we may want to apply filters.
1094 event_recorder
->parent
.enabled
= 0;
1095 event_recorder
->priv
->parent
.registered
= 1;
1098 * Populate lttng_event structure before event
1103 ret
= lttng_uprobes_register_event(event_param
->name
,
1104 event_param
->u
.uprobe
.fd
,
1107 goto register_error
;
1108 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1112 case LTTNG_KERNEL_ABI_FUNCTION
:
1114 case LTTNG_KERNEL_ABI_NOOP
:
1119 goto register_error
;
1121 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1122 WARN_ON_ONCE(ret
> 0);
1124 goto statedump_error
;
1126 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1127 list_add(&event_recorder
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1128 return event_recorder
;
1131 /* If a statedump error occurs, events will not be readable. */
1133 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1134 cache_private_error
:
1135 kmem_cache_free(event_recorder_cache
, event_recorder
);
1140 return ERR_PTR(ret
);
1143 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1144 const struct lttng_kernel_event_desc
*event_desc
,
1145 uint64_t token
, uint64_t error_counter_index
,
1146 struct lttng_event_notifier_group
*event_notifier_group
,
1147 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1148 enum lttng_kernel_abi_instrumentation itype
)
1150 struct lttng_kernel_event_notifier
*event_notifier
;
1151 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1152 struct lttng_counter
*error_counter
;
1153 const char *event_name
;
1154 struct hlist_head
*head
;
1158 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1159 event_name
= event_desc
->event_name
;
1162 case LTTNG_KERNEL_ABI_KPROBE
:
1164 case LTTNG_KERNEL_ABI_UPROBE
:
1166 case LTTNG_KERNEL_ABI_SYSCALL
:
1167 event_name
= event_notifier_param
->event
.name
;
1170 case LTTNG_KERNEL_ABI_KRETPROBE
:
1172 case LTTNG_KERNEL_ABI_FUNCTION
:
1174 case LTTNG_KERNEL_ABI_NOOP
:
1182 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1183 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1184 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1185 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1186 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1187 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1188 && event_notifier_group
== event_notifier_priv
->group
1189 && token
== event_notifier_priv
->parent
.user_token
) {
1195 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1196 if (!event_notifier
) {
1200 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1201 if (!event_notifier_priv
) {
1203 goto cache_private_error
;
1205 event_notifier_priv
->pub
= event_notifier
;
1206 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1207 event_notifier
->priv
= event_notifier_priv
;
1208 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1209 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1211 event_notifier
->priv
->group
= event_notifier_group
;
1212 event_notifier
->priv
->parent
.user_token
= token
;
1213 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1214 event_notifier
->priv
->num_captures
= 0;
1215 event_notifier
->priv
->parent
.instrumentation
= itype
;
1216 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1217 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1218 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1219 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1220 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1223 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1224 /* Event will be enabled by enabler sync. */
1225 event_notifier
->parent
.enabled
= 0;
1226 event_notifier
->priv
->parent
.registered
= 0;
1227 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1228 if (!event_notifier
->priv
->parent
.desc
) {
1230 goto register_error
;
1232 /* Populate lttng_event_notifier structure before event registration. */
1236 case LTTNG_KERNEL_ABI_KPROBE
:
1238 * Needs to be explicitly enabled after creation, since
1239 * we may want to apply filters.
1241 event_notifier
->parent
.enabled
= 0;
1242 event_notifier
->priv
->parent
.registered
= 1;
1244 * Populate lttng_event_notifier structure before event
1248 ret
= lttng_kprobes_register_event_notifier(
1249 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1250 event_notifier_param
->event
.u
.kprobe
.offset
,
1251 event_notifier_param
->event
.u
.kprobe
.addr
,
1255 goto register_error
;
1257 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1261 case LTTNG_KERNEL_ABI_SYSCALL
:
1263 * Needs to be explicitly enabled after creation, since
1264 * we may want to apply filters.
1266 event_notifier
->parent
.enabled
= 0;
1267 event_notifier
->priv
->parent
.registered
= 0;
1268 event_notifier
->priv
->parent
.desc
= event_desc
;
1269 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1270 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1272 goto register_error
;
1273 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1274 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1276 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1277 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1280 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1281 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1283 goto register_error
;
1284 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1285 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1287 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1288 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1292 if (!event_notifier
->priv
->parent
.desc
) {
1294 goto register_error
;
1298 case LTTNG_KERNEL_ABI_UPROBE
:
1300 * Needs to be explicitly enabled after creation, since
1301 * we may want to apply filters.
1303 event_notifier
->parent
.enabled
= 0;
1304 event_notifier
->priv
->parent
.registered
= 1;
1307 * Populate lttng_event_notifier structure before
1308 * event_notifier registration.
1312 ret
= lttng_uprobes_register_event_notifier(
1313 event_notifier_param
->event
.name
,
1314 event_notifier_param
->event
.u
.uprobe
.fd
,
1317 goto register_error
;
1318 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1322 case LTTNG_KERNEL_ABI_KRETPROBE
:
1324 case LTTNG_KERNEL_ABI_FUNCTION
:
1326 case LTTNG_KERNEL_ABI_NOOP
:
1331 goto register_error
;
1334 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1335 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1338 * Clear the error counter bucket. The sessiond keeps track of which
1339 * bucket is currently in use. We trust it. The session lock
1340 * synchronizes against concurrent creation of the error
1343 error_counter
= event_notifier_group
->error_counter
;
1344 if (error_counter
) {
1345 size_t dimension_index
[1];
1348 * Check that the index is within the boundary of the counter.
1350 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1351 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1352 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1354 goto register_error
;
1357 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1358 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1360 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1361 event_notifier
->priv
->error_counter_index
);
1362 goto register_error
;
1366 return event_notifier
;
1369 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1370 cache_private_error
:
1371 kmem_cache_free(event_notifier_cache
, event_notifier
);
1375 return ERR_PTR(ret
);
1378 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1379 const size_t *dim_indexes
, int32_t cpu
,
1380 int64_t *val
, bool *overflow
, bool *underflow
)
1382 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1383 cpu
, val
, overflow
, underflow
);
1386 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1387 const size_t *dim_indexes
, int64_t *val
,
1388 bool *overflow
, bool *underflow
)
1390 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1391 val
, overflow
, underflow
);
1394 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1395 const size_t *dim_indexes
)
1397 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1400 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
1401 struct lttng_kernel_abi_event
*event_param
,
1402 const struct lttng_kernel_event_desc
*event_desc
,
1403 enum lttng_kernel_abi_instrumentation itype
)
1405 struct lttng_kernel_event_recorder
*event
;
1407 mutex_lock(&sessions_mutex
);
1408 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1409 mutex_unlock(&sessions_mutex
);
1413 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1414 const struct lttng_kernel_event_desc
*event_desc
,
1415 uint64_t id
, uint64_t error_counter_index
,
1416 struct lttng_event_notifier_group
*event_notifier_group
,
1417 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1418 enum lttng_kernel_abi_instrumentation itype
)
1420 struct lttng_kernel_event_notifier
*event_notifier
;
1422 mutex_lock(&sessions_mutex
);
1423 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1424 error_counter_index
, event_notifier_group
,
1425 event_notifier_param
, itype
);
1426 mutex_unlock(&sessions_mutex
);
1427 return event_notifier
;
1430 /* Only used for tracepoints for now. */
1432 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1434 const struct lttng_kernel_event_desc
*desc
;
1437 WARN_ON_ONCE(event_recorder
->priv
->parent
.registered
);
1439 desc
= event_recorder
->priv
->parent
.desc
;
1440 switch (event_recorder
->priv
->parent
.instrumentation
) {
1441 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1442 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1443 desc
->tp_class
->probe_callback
,
1447 case LTTNG_KERNEL_ABI_SYSCALL
:
1448 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1451 case LTTNG_KERNEL_ABI_KPROBE
:
1453 case LTTNG_KERNEL_ABI_UPROBE
:
1455 case LTTNG_KERNEL_ABI_KRETPROBE
:
1459 case LTTNG_KERNEL_ABI_FUNCTION
:
1461 case LTTNG_KERNEL_ABI_NOOP
:
1467 event_recorder
->priv
->parent
.registered
= 1;
1471 * Only used internally at session destruction.
1474 void unregister_event(struct lttng_kernel_event_recorder
*event_recorder
)
1476 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1477 const struct lttng_kernel_event_desc
*desc
;
1480 WARN_ON_ONCE(!event_priv
->registered
);
1482 desc
= event_priv
->desc
;
1483 switch (event_priv
->instrumentation
) {
1484 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1485 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1486 event_priv
->desc
->tp_class
->probe_callback
,
1490 case LTTNG_KERNEL_ABI_KPROBE
:
1491 lttng_kprobes_unregister_event(event_recorder
);
1495 case LTTNG_KERNEL_ABI_KRETPROBE
:
1496 lttng_kretprobes_unregister(event_recorder
);
1500 case LTTNG_KERNEL_ABI_SYSCALL
:
1501 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1504 case LTTNG_KERNEL_ABI_NOOP
:
1508 case LTTNG_KERNEL_ABI_UPROBE
:
1509 lttng_uprobes_unregister_event(event_recorder
);
1513 case LTTNG_KERNEL_ABI_FUNCTION
:
1520 event_priv
->registered
= 0;
1524 void _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1526 if (event_recorder
->priv
->parent
.registered
)
1527 unregister_event(event_recorder
);
1530 /* Only used for tracepoints for now. */
1532 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1534 const struct lttng_kernel_event_desc
*desc
;
1537 WARN_ON_ONCE(event_notifier
->priv
->parent
.registered
);
1539 desc
= event_notifier
->priv
->parent
.desc
;
1540 switch (event_notifier
->priv
->parent
.instrumentation
) {
1541 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1542 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1543 desc
->tp_class
->probe_callback
,
1547 case LTTNG_KERNEL_ABI_SYSCALL
:
1548 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1551 case LTTNG_KERNEL_ABI_KPROBE
:
1553 case LTTNG_KERNEL_ABI_UPROBE
:
1557 case LTTNG_KERNEL_ABI_KRETPROBE
:
1559 case LTTNG_KERNEL_ABI_FUNCTION
:
1561 case LTTNG_KERNEL_ABI_NOOP
:
1567 event_notifier
->priv
->parent
.registered
= 1;
1571 int unregister_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1573 const struct lttng_kernel_event_desc
*desc
;
1576 WARN_ON_ONCE(!event_notifier
->priv
->parent
.registered
);
1578 desc
= event_notifier
->priv
->parent
.desc
;
1579 switch (event_notifier
->priv
->parent
.instrumentation
) {
1580 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1581 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1582 event_notifier
->priv
->parent
.desc
->tp_class
->probe_callback
,
1586 case LTTNG_KERNEL_ABI_KPROBE
:
1587 lttng_kprobes_unregister_event_notifier(event_notifier
);
1591 case LTTNG_KERNEL_ABI_UPROBE
:
1592 lttng_uprobes_unregister_event_notifier(event_notifier
);
1596 case LTTNG_KERNEL_ABI_SYSCALL
:
1597 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1600 case LTTNG_KERNEL_ABI_KRETPROBE
:
1602 case LTTNG_KERNEL_ABI_FUNCTION
:
1604 case LTTNG_KERNEL_ABI_NOOP
:
1610 event_notifier
->priv
->parent
.registered
= 0;
1615 void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
)
1617 if (event_notifier
->priv
->parent
.registered
)
1618 unregister_event_notifier(event_notifier
);
1622 * Only used internally at session destruction.
1625 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1627 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1628 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1630 lttng_free_event_filter_runtime(event
);
1631 /* Free event enabler refs */
1632 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1633 &event_priv
->enablers_ref_head
, node
)
1636 switch (event
->type
) {
1637 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1639 struct lttng_kernel_event_recorder
*event_recorder
=
1640 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1642 switch (event_priv
->instrumentation
) {
1643 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1644 lttng_event_desc_put(event_priv
->desc
);
1647 case LTTNG_KERNEL_ABI_KPROBE
:
1648 module_put(event_priv
->desc
->owner
);
1649 lttng_kprobes_destroy_event_private(event_recorder
);
1652 case LTTNG_KERNEL_ABI_KRETPROBE
:
1653 module_put(event_priv
->desc
->owner
);
1654 lttng_kretprobes_destroy_private(event_recorder
);
1657 case LTTNG_KERNEL_ABI_SYSCALL
:
1660 case LTTNG_KERNEL_ABI_UPROBE
:
1661 module_put(event_priv
->desc
->owner
);
1662 lttng_uprobes_destroy_event_private(event_recorder
);
1665 case LTTNG_KERNEL_ABI_FUNCTION
:
1667 case LTTNG_KERNEL_ABI_NOOP
:
1672 list_del(&event_recorder
->priv
->node
);
1673 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1674 kmem_cache_free(event_recorder_cache
, event_recorder
);
1677 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1679 struct lttng_kernel_event_notifier
*event_notifier
=
1680 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1682 switch (event_notifier
->priv
->parent
.instrumentation
) {
1683 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1684 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1687 case LTTNG_KERNEL_ABI_KPROBE
:
1688 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1689 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1692 case LTTNG_KERNEL_ABI_SYSCALL
:
1695 case LTTNG_KERNEL_ABI_UPROBE
:
1696 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1697 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1700 case LTTNG_KERNEL_ABI_KRETPROBE
:
1702 case LTTNG_KERNEL_ABI_FUNCTION
:
1704 case LTTNG_KERNEL_ABI_NOOP
:
1709 list_del(&event_notifier
->priv
->node
);
1710 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1711 kmem_cache_free(event_notifier_cache
, event_notifier
);
1719 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1720 enum tracker_type tracker_type
)
1722 switch (tracker_type
) {
1724 return &session
->pid_tracker
;
1726 return &session
->vpid_tracker
;
1728 return &session
->uid_tracker
;
1730 return &session
->vuid_tracker
;
1732 return &session
->gid_tracker
;
1734 return &session
->vgid_tracker
;
1741 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1742 enum tracker_type tracker_type
, int id
)
1744 struct lttng_kernel_id_tracker
*tracker
;
1747 tracker
= get_tracker(session
, tracker_type
);
1752 mutex_lock(&sessions_mutex
);
1754 /* track all ids: destroy tracker. */
1755 lttng_id_tracker_destroy(tracker
, true);
1758 ret
= lttng_id_tracker_add(tracker
, id
);
1760 mutex_unlock(&sessions_mutex
);
1764 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1765 enum tracker_type tracker_type
, int id
)
1767 struct lttng_kernel_id_tracker
*tracker
;
1770 tracker
= get_tracker(session
, tracker_type
);
1775 mutex_lock(&sessions_mutex
);
1777 /* untrack all ids: replace by empty tracker. */
1778 ret
= lttng_id_tracker_empty_set(tracker
);
1780 ret
= lttng_id_tracker_del(tracker
, id
);
1782 mutex_unlock(&sessions_mutex
);
1787 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1789 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1790 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1791 struct lttng_id_hash_node
*e
;
1794 mutex_lock(&sessions_mutex
);
1796 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1797 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1799 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1805 /* ID tracker disabled. */
1806 if (iter
>= *pos
&& iter
== 0) {
1807 return id_tracker_p
; /* empty tracker */
1815 /* Called with sessions_mutex held. */
1817 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1819 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1820 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1821 struct lttng_id_hash_node
*e
;
1826 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1827 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1829 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1830 if (iter
++ >= *ppos
)
1835 /* ID tracker disabled. */
1836 if (iter
>= *ppos
&& iter
== 0)
1837 return p
; /* empty tracker */
1846 void id_list_stop(struct seq_file
*m
, void *p
)
1848 mutex_unlock(&sessions_mutex
);
1852 int id_list_show(struct seq_file
*m
, void *p
)
1854 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1855 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1858 if (p
== id_tracker_p
) {
1859 /* Tracker disabled. */
1862 const struct lttng_id_hash_node
*e
= p
;
1864 id
= lttng_id_tracker_get_node_id(e
);
1866 switch (id_tracker
->priv
->tracker_type
) {
1868 seq_printf(m
, "process { pid = %d; };\n", id
);
1871 seq_printf(m
, "process { vpid = %d; };\n", id
);
1874 seq_printf(m
, "user { uid = %d; };\n", id
);
1877 seq_printf(m
, "user { vuid = %d; };\n", id
);
1880 seq_printf(m
, "group { gid = %d; };\n", id
);
1883 seq_printf(m
, "group { vgid = %d; };\n", id
);
1886 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1892 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1893 .start
= id_list_start
,
1894 .next
= id_list_next
,
1895 .stop
= id_list_stop
,
1896 .show
= id_list_show
,
1900 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1902 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1906 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1908 struct seq_file
*m
= file
->private_data
;
1909 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1912 WARN_ON_ONCE(!id_tracker
);
1913 ret
= seq_release(inode
, file
);
1915 fput(id_tracker
->priv
->session
->priv
->file
);
1919 const struct file_operations lttng_tracker_ids_list_fops
= {
1920 .owner
= THIS_MODULE
,
1921 .open
= lttng_tracker_ids_list_open
,
1923 .llseek
= seq_lseek
,
1924 .release
= lttng_tracker_ids_list_release
,
1927 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1928 enum tracker_type tracker_type
)
1930 struct file
*tracker_ids_list_file
;
1934 file_fd
= lttng_get_unused_fd();
1940 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1941 <tng_tracker_ids_list_fops
,
1943 if (IS_ERR(tracker_ids_list_file
)) {
1944 ret
= PTR_ERR(tracker_ids_list_file
);
1947 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1949 goto refcount_error
;
1951 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1954 m
= tracker_ids_list_file
->private_data
;
1956 m
->private = get_tracker(session
, tracker_type
);
1957 BUG_ON(!m
->private);
1958 fd_install(file_fd
, tracker_ids_list_file
);
1963 atomic_long_dec(&session
->priv
->file
->f_count
);
1965 fput(tracker_ids_list_file
);
1967 put_unused_fd(file_fd
);
1973 * Enabler management.
1976 int lttng_match_enabler_star_glob(const char *desc_name
,
1977 const char *pattern
)
1979 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1980 desc_name
, LTTNG_SIZE_MAX
))
1986 int lttng_match_enabler_name(const char *desc_name
,
1989 if (strcmp(desc_name
, name
))
1994 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1995 struct lttng_enabler
*enabler
)
1997 const char *desc_name
, *enabler_name
;
1998 bool compat
= false, entry
= false;
2000 enabler_name
= enabler
->event_param
.name
;
2001 switch (enabler
->event_param
.instrumentation
) {
2002 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2003 desc_name
= desc
->event_name
;
2004 switch (enabler
->format_type
) {
2005 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2006 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2007 case LTTNG_ENABLER_FORMAT_NAME
:
2008 return lttng_match_enabler_name(desc_name
, enabler_name
);
2014 case LTTNG_KERNEL_ABI_SYSCALL
:
2015 desc_name
= desc
->event_name
;
2016 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2017 desc_name
+= strlen("compat_");
2020 if (!strncmp(desc_name
, "syscall_exit_",
2021 strlen("syscall_exit_"))) {
2022 desc_name
+= strlen("syscall_exit_");
2023 } else if (!strncmp(desc_name
, "syscall_entry_",
2024 strlen("syscall_entry_"))) {
2025 desc_name
+= strlen("syscall_entry_");
2031 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2032 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2034 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2038 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2045 switch (enabler
->event_param
.u
.syscall
.abi
) {
2046 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2048 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2052 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2059 switch (enabler
->event_param
.u
.syscall
.match
) {
2060 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2061 switch (enabler
->format_type
) {
2062 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2063 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2064 case LTTNG_ENABLER_FORMAT_NAME
:
2065 return lttng_match_enabler_name(desc_name
, enabler_name
);
2070 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2071 return -EINVAL
; /* Not implemented. */
2084 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2085 struct lttng_kernel_event_recorder
*event_recorder
)
2087 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2090 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2092 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2093 && event_recorder
->chan
== event_enabler
->chan
)
2100 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2101 struct lttng_kernel_event_notifier
*event_notifier
)
2103 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2104 event_notifier_enabler
);
2106 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2108 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2109 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2110 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2117 struct lttng_enabler_ref
*lttng_enabler_ref(
2118 struct list_head
*enablers_ref_list
,
2119 struct lttng_enabler
*enabler
)
2121 struct lttng_enabler_ref
*enabler_ref
;
2123 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2124 if (enabler_ref
->ref
== enabler
)
2131 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2133 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2134 struct lttng_kernel_probe_desc
*probe_desc
;
2135 const struct lttng_kernel_event_desc
*desc
;
2137 struct list_head
*probe_list
;
2139 probe_list
= lttng_get_probe_list_head();
2141 * For each probe event, if we find that a probe event matches
2142 * our enabler, create an associated lttng_event if not
2145 list_for_each_entry(probe_desc
, probe_list
, head
) {
2146 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2148 struct hlist_head
*head
;
2149 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2150 struct lttng_kernel_event_recorder
*event_recorder
;
2152 desc
= probe_desc
->event_desc
[i
];
2153 if (!lttng_desc_match_enabler(desc
,
2154 lttng_event_enabler_as_enabler(event_enabler
)))
2158 * Check if already created.
2160 head
= utils_borrow_hash_table_bucket(
2161 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2163 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2164 if (event_recorder_private
->parent
.desc
== desc
2165 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2172 * We need to create an event for this
2175 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2176 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2177 if (!event_recorder
) {
2178 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2179 probe_desc
->event_desc
[i
]->event_name
);
2186 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2188 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2189 struct lttng_kernel_probe_desc
*probe_desc
;
2190 const struct lttng_kernel_event_desc
*desc
;
2192 struct list_head
*probe_list
;
2194 probe_list
= lttng_get_probe_list_head();
2196 * For each probe event, if we find that a probe event matches
2197 * our enabler, create an associated lttng_event_notifier if not
2200 list_for_each_entry(probe_desc
, probe_list
, head
) {
2201 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2203 struct hlist_head
*head
;
2204 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2205 struct lttng_kernel_event_notifier
*event_notifier
;
2207 desc
= probe_desc
->event_desc
[i
];
2208 if (!lttng_desc_match_enabler(desc
,
2209 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2213 * Check if already created.
2215 head
= utils_borrow_hash_table_bucket(
2216 event_notifier_group
->event_notifiers_ht
.table
,
2217 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2218 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2219 if (event_notifier_priv
->parent
.desc
== desc
2220 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2227 * We need to create a event_notifier for this event probe.
2229 event_notifier
= _lttng_event_notifier_create(desc
,
2230 event_notifier_enabler
->base
.user_token
,
2231 event_notifier_enabler
->error_counter_index
,
2232 event_notifier_group
, NULL
,
2233 LTTNG_KERNEL_ABI_TRACEPOINT
);
2234 if (IS_ERR(event_notifier
)) {
2235 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2236 probe_desc
->event_desc
[i
]->event_name
);
2243 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2247 ret
= lttng_syscalls_register_event(event_enabler
);
2252 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2256 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2258 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2263 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2264 * tracepoint probes.
2265 * Should be called with sessions mutex held.
2268 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2270 switch (event_enabler
->base
.event_param
.instrumentation
) {
2271 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2272 lttng_create_tracepoint_event_if_missing(event_enabler
);
2275 case LTTNG_KERNEL_ABI_SYSCALL
:
2276 lttng_create_syscall_event_if_missing(event_enabler
);
2286 * Create events associated with an event_enabler (if not already present),
2287 * and add backward reference from the event to the enabler.
2288 * Should be called with sessions mutex held.
2291 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2293 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2294 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2295 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2296 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2298 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2299 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2300 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2301 !strcmp(base_enabler
->event_param
.name
, "*")) {
2302 int enabled
= base_enabler
->enabled
;
2303 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2305 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2306 WRITE_ONCE(chan
->priv
->parent
.syscall_all_entry
, enabled
);
2308 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2309 WRITE_ONCE(chan
->priv
->parent
.syscall_all_exit
, enabled
);
2312 /* First ensure that probe events are created for this enabler. */
2313 lttng_create_event_if_missing(event_enabler
);
2315 /* For each event matching event_enabler in session event list. */
2316 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2317 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2318 struct lttng_enabler_ref
*enabler_ref
;
2320 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2322 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2323 lttng_event_enabler_as_enabler(event_enabler
));
2326 * If no backward ref, create it.
2327 * Add backward ref from event to event_enabler.
2329 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2332 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2333 list_add(&enabler_ref
->node
,
2334 &event_recorder_priv
->parent
.enablers_ref_head
);
2338 * Link filter bytecodes if not linked yet.
2340 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2342 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2343 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2349 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2350 * tracepoint probes.
2351 * Should be called with sessions mutex held.
2354 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2356 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2357 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2358 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2361 case LTTNG_KERNEL_ABI_SYSCALL
:
2362 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2372 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2375 int lttng_event_notifier_enabler_ref_event_notifiers(
2376 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2378 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2379 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2380 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2382 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2383 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2384 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2385 !strcmp(base_enabler
->event_param
.name
, "*")) {
2387 int enabled
= base_enabler
->enabled
;
2388 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2390 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2391 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2393 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2394 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2398 /* First ensure that probe event_notifiers are created for this enabler. */
2399 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2401 /* Link the created event_notifier with its associated enabler. */
2402 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2403 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2404 struct lttng_enabler_ref
*enabler_ref
;
2406 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2409 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2410 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2413 * If no backward ref, create it.
2414 * Add backward ref from event_notifier to enabler.
2416 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2420 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2421 event_notifier_enabler
);
2422 list_add(&enabler_ref
->node
,
2423 &event_notifier_priv
->parent
.enablers_ref_head
);
2427 * Link filter bytecodes if not linked yet.
2429 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2430 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2431 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2433 /* Link capture bytecodes if not linked yet. */
2434 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2435 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2436 &event_notifier_enabler
->capture_bytecode_head
);
2438 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2444 * Called at module load: connect the probe on all enablers matching
2446 * Called with sessions lock held.
2448 int lttng_fix_pending_events(void)
2450 struct lttng_kernel_session_private
*session_priv
;
2452 list_for_each_entry(session_priv
, &sessions
, list
)
2453 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2457 static bool lttng_event_notifier_group_has_active_event_notifiers(
2458 struct lttng_event_notifier_group
*event_notifier_group
)
2460 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2462 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2464 if (event_notifier_enabler
->base
.enabled
)
2470 bool lttng_event_notifier_active(void)
2472 struct lttng_event_notifier_group
*event_notifier_group
;
2474 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2475 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2481 int lttng_fix_pending_event_notifiers(void)
2483 struct lttng_event_notifier_group
*event_notifier_group
;
2485 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2486 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2490 struct lttng_event_enabler
*lttng_event_enabler_create(
2491 enum lttng_enabler_format_type format_type
,
2492 struct lttng_kernel_abi_event
*event_param
,
2493 struct lttng_kernel_channel_buffer
*chan
)
2495 struct lttng_event_enabler
*event_enabler
;
2497 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2500 event_enabler
->base
.format_type
= format_type
;
2501 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2502 memcpy(&event_enabler
->base
.event_param
, event_param
,
2503 sizeof(event_enabler
->base
.event_param
));
2504 event_enabler
->chan
= chan
;
2506 event_enabler
->base
.enabled
= 0;
2507 mutex_lock(&sessions_mutex
);
2508 list_add(&event_enabler
->node
, &event_enabler
->chan
->parent
.session
->priv
->enablers_head
);
2509 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2510 mutex_unlock(&sessions_mutex
);
2511 return event_enabler
;
2514 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2516 mutex_lock(&sessions_mutex
);
2517 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2518 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2519 mutex_unlock(&sessions_mutex
);
2523 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2525 mutex_lock(&sessions_mutex
);
2526 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2527 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2528 mutex_unlock(&sessions_mutex
);
2533 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2534 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2536 struct lttng_kernel_bytecode_node
*bytecode_node
;
2537 uint32_t bytecode_len
;
2540 ret
= get_user(bytecode_len
, &bytecode
->len
);
2543 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2547 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2548 sizeof(*bytecode
) + bytecode_len
);
2552 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2553 bytecode_node
->enabler
= enabler
;
2554 /* Enforce length based on allocated size */
2555 bytecode_node
->bc
.len
= bytecode_len
;
2556 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2561 lttng_kvfree(bytecode_node
);
2565 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2566 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2569 ret
= lttng_enabler_attach_filter_bytecode(
2570 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2574 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2581 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2582 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2585 switch (event
->priv
->instrumentation
) {
2586 case LTTNG_KERNEL_ABI_UPROBE
:
2587 return lttng_uprobes_event_add_callsite(event
, callsite
);
2594 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2596 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2598 /* Destroy filter bytecode */
2599 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2600 &enabler
->filter_bytecode_head
, node
) {
2601 lttng_kvfree(filter_node
);
2606 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2608 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2610 list_del(&event_enabler
->node
);
2611 kfree(event_enabler
);
2614 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2615 struct lttng_event_notifier_group
*event_notifier_group
,
2616 enum lttng_enabler_format_type format_type
,
2617 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2619 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2621 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2622 if (!event_notifier_enabler
)
2625 event_notifier_enabler
->base
.format_type
= format_type
;
2626 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2627 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2629 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2630 event_notifier_enabler
->num_captures
= 0;
2632 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2633 sizeof(event_notifier_enabler
->base
.event_param
));
2635 event_notifier_enabler
->base
.enabled
= 0;
2636 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2637 event_notifier_enabler
->group
= event_notifier_group
;
2639 mutex_lock(&sessions_mutex
);
2640 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2641 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2643 mutex_unlock(&sessions_mutex
);
2645 return event_notifier_enabler
;
2648 int lttng_event_notifier_enabler_enable(
2649 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2651 mutex_lock(&sessions_mutex
);
2652 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2653 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2654 mutex_unlock(&sessions_mutex
);
2658 int lttng_event_notifier_enabler_disable(
2659 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2661 mutex_lock(&sessions_mutex
);
2662 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2663 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2664 mutex_unlock(&sessions_mutex
);
2668 int lttng_event_notifier_enabler_attach_filter_bytecode(
2669 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2670 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2674 ret
= lttng_enabler_attach_filter_bytecode(
2675 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2680 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2687 int lttng_event_notifier_enabler_attach_capture_bytecode(
2688 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2689 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2691 struct lttng_kernel_bytecode_node
*bytecode_node
;
2692 struct lttng_enabler
*enabler
=
2693 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2694 uint32_t bytecode_len
;
2697 ret
= get_user(bytecode_len
, &bytecode
->len
);
2701 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2706 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2707 sizeof(*bytecode
) + bytecode_len
);
2711 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2712 bytecode_node
->enabler
= enabler
;
2714 /* Enforce length based on allocated size */
2715 bytecode_node
->bc
.len
= bytecode_len
;
2716 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2718 event_notifier_enabler
->num_captures
++;
2720 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2724 lttng_kvfree(bytecode_node
);
2730 void lttng_event_notifier_enabler_destroy(
2731 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2733 if (!event_notifier_enabler
) {
2737 list_del(&event_notifier_enabler
->node
);
2739 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2740 kfree(event_notifier_enabler
);
2744 * lttng_session_sync_event_enablers should be called just before starting a
2746 * Should be called with sessions mutex held.
2749 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2751 struct lttng_event_enabler
*event_enabler
;
2752 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2754 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2755 lttng_event_enabler_ref_events(event_enabler
);
2757 * For each event, if at least one of its enablers is enabled,
2758 * and its channel and session transient states are enabled, we
2759 * enable the event, else we disable it.
2761 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2762 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2763 struct lttng_enabler_ref
*enabler_ref
;
2764 struct lttng_kernel_bytecode_runtime
*runtime
;
2765 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2768 switch (event_recorder_priv
->parent
.instrumentation
) {
2769 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2771 case LTTNG_KERNEL_ABI_SYSCALL
:
2773 list_for_each_entry(enabler_ref
,
2774 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2775 if (enabler_ref
->ref
->enabled
) {
2783 /* Not handled with lazy sync. */
2787 * Enabled state is based on union of enablers, with
2788 * intesection of session and channel transient enable
2791 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2793 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2795 * Sync tracepoint registration with event enabled
2799 if (!event_recorder_priv
->parent
.registered
)
2800 register_event(event_recorder
);
2802 if (event_recorder_priv
->parent
.registered
)
2803 _lttng_event_unregister(event_recorder
);
2806 /* Check if has enablers without bytecode enabled */
2807 list_for_each_entry(enabler_ref
,
2808 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2809 if (enabler_ref
->ref
->enabled
2810 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2811 has_enablers_without_filter_bytecode
= 1;
2815 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2816 has_enablers_without_filter_bytecode
;
2818 /* Enable filters */
2819 list_for_each_entry(runtime
,
2820 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2821 lttng_bytecode_sync_state(runtime
);
2824 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2825 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2830 * Apply enablers to session events, adding events to session if need
2831 * be. It is required after each modification applied to an active
2832 * session, and right before session "start".
2833 * "lazy" sync means we only sync if required.
2834 * Should be called with sessions mutex held.
2837 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2839 /* We can skip if session is not active */
2840 if (!session
->active
)
2842 lttng_session_sync_event_enablers(session
);
2846 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2848 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2849 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2851 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2852 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2855 * For each event_notifier, if at least one of its enablers is enabled,
2856 * we enable the event_notifier, else we disable it.
2858 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2859 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2860 struct lttng_enabler_ref
*enabler_ref
;
2861 struct lttng_kernel_bytecode_runtime
*runtime
;
2862 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2863 int nr_filters
= 0, nr_captures
= 0;
2865 switch (event_notifier_priv
->parent
.instrumentation
) {
2866 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2868 case LTTNG_KERNEL_ABI_SYSCALL
:
2869 /* Enable event_notifiers */
2870 list_for_each_entry(enabler_ref
,
2871 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2872 if (enabler_ref
->ref
->enabled
) {
2880 /* Not handled with sync. */
2884 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2886 * Sync tracepoint registration with event_notifier enabled
2890 if (!event_notifier_priv
->parent
.registered
)
2891 register_event_notifier(event_notifier
);
2893 if (event_notifier_priv
->parent
.registered
)
2894 unregister_event_notifier(event_notifier
);
2897 /* Check if has enablers without bytecode enabled */
2898 list_for_each_entry(enabler_ref
,
2899 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2900 if (enabler_ref
->ref
->enabled
2901 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2902 has_enablers_without_filter_bytecode
= 1;
2906 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2907 has_enablers_without_filter_bytecode
;
2909 /* Enable filters */
2910 list_for_each_entry(runtime
,
2911 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2912 lttng_bytecode_sync_state(runtime
);
2915 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2916 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2918 /* Enable captures */
2919 list_for_each_entry(runtime
,
2920 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2921 lttng_bytecode_sync_state(runtime
);
2924 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2929 * Serialize at most one packet worth of metadata into a metadata
2931 * We grab the metadata cache mutex to get exclusive access to our metadata
2932 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2933 * allows us to do racy operations such as looking for remaining space left in
2934 * packet and write, since mutual exclusion protects us from concurrent writes.
2935 * Mutual exclusion on the metadata cache allow us to read the cache content
2936 * without racing against reallocation of the cache by updates.
2937 * Returns the number of bytes written in the channel, 0 if no data
2938 * was written and a negative value on error.
2940 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2941 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2943 struct lttng_kernel_ring_buffer_ctx ctx
;
2945 size_t len
, reserve_len
;
2948 * Ensure we support mutiple get_next / put sequences followed by
2949 * put_next. The metadata cache lock protects reading the metadata
2950 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2951 * "flush" operations on the buffer invoked by different processes.
2952 * Moreover, since the metadata cache memory can be reallocated, we
2953 * need to have exclusive access against updates even though we only
2956 mutex_lock(&stream
->metadata_cache
->lock
);
2957 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2958 if (stream
->metadata_in
!= stream
->metadata_out
)
2961 /* Metadata regenerated, change the version. */
2962 if (stream
->metadata_cache
->version
!= stream
->version
)
2963 stream
->version
= stream
->metadata_cache
->version
;
2965 len
= stream
->metadata_cache
->metadata_written
-
2966 stream
->metadata_in
;
2969 reserve_len
= min_t(size_t,
2970 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2972 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2973 sizeof(char), NULL
);
2975 * If reservation failed, return an error to the caller.
2977 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2979 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2980 stream
->coherent
= false;
2983 stream
->transport
->ops
.event_write(&ctx
,
2984 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2986 stream
->transport
->ops
.event_commit(&ctx
);
2987 stream
->metadata_in
+= reserve_len
;
2988 if (reserve_len
< len
)
2989 stream
->coherent
= false;
2991 stream
->coherent
= true;
2996 *coherent
= stream
->coherent
;
2997 mutex_unlock(&stream
->metadata_cache
->lock
);
3002 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
3004 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
3005 mutex_lock(&session
->priv
->metadata_cache
->lock
);
3009 void lttng_metadata_end(struct lttng_kernel_session
*session
)
3011 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3012 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
3013 struct lttng_metadata_stream
*stream
;
3015 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
3016 wake_up_interruptible(&stream
->read_wait
);
3017 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
3022 * Write the metadata to the metadata cache.
3023 * Must be called with sessions_mutex held.
3024 * The metadata cache lock protects us from concurrent read access from
3025 * thread outputting metadata content to ring buffer.
3026 * The content of the printf is printed as a single atomic metadata
3029 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3030 const char *fmt
, ...)
3036 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3039 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3045 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3046 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3047 session
->priv
->metadata_cache
->cache_alloc
) {
3048 char *tmp_cache_realloc
;
3049 unsigned int tmp_cache_alloc_size
;
3051 tmp_cache_alloc_size
= max_t(unsigned int,
3052 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3053 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3054 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3055 if (!tmp_cache_realloc
)
3057 if (session
->priv
->metadata_cache
->data
) {
3058 memcpy(tmp_cache_realloc
,
3059 session
->priv
->metadata_cache
->data
,
3060 session
->priv
->metadata_cache
->cache_alloc
);
3061 vfree(session
->priv
->metadata_cache
->data
);
3064 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3065 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3067 memcpy(session
->priv
->metadata_cache
->data
+
3068 session
->priv
->metadata_cache
->metadata_written
,
3070 session
->priv
->metadata_cache
->metadata_written
+= len
;
3081 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3085 for (i
= 0; i
< nesting
; i
++) {
3088 ret
= lttng_metadata_printf(session
, " ");
3097 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3098 const struct lttng_kernel_event_field
*field
,
3101 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3105 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3106 const struct lttng_kernel_type_integer
*type
,
3107 enum lttng_kernel_string_encoding parent_encoding
,
3112 ret
= print_tabs(session
, nesting
);
3115 ret
= lttng_metadata_printf(session
,
3116 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3120 (parent_encoding
== lttng_kernel_string_encoding_none
)
3122 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3126 #if __BYTE_ORDER == __BIG_ENDIAN
3127 type
->reverse_byte_order
? " byte_order = le;" : ""
3129 type
->reverse_byte_order
? " byte_order = be;" : ""
3136 * Must be called with sessions_mutex held.
3139 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3140 const struct lttng_kernel_type_struct
*type
,
3143 const char *prev_field_name
= NULL
;
3145 uint32_t i
, nr_fields
;
3146 unsigned int alignment
;
3148 ret
= print_tabs(session
, nesting
);
3151 ret
= lttng_metadata_printf(session
,
3155 nr_fields
= type
->nr_fields
;
3156 for (i
= 0; i
< nr_fields
; i
++) {
3157 const struct lttng_kernel_event_field
*iter_field
;
3159 iter_field
= type
->fields
[i
];
3160 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3164 ret
= print_tabs(session
, nesting
);
3167 alignment
= type
->alignment
;
3169 ret
= lttng_metadata_printf(session
,
3173 ret
= lttng_metadata_printf(session
,
3180 * Must be called with sessions_mutex held.
3183 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3184 const struct lttng_kernel_event_field
*field
,
3189 ret
= _lttng_struct_type_statedump(session
,
3190 lttng_kernel_get_type_struct(field
->type
), nesting
);
3193 return lttng_field_name_statedump(session
, field
, nesting
);
3197 * Must be called with sessions_mutex held.
3200 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3201 const struct lttng_kernel_type_variant
*type
,
3203 const char *prev_field_name
)
3205 const char *tag_name
;
3207 uint32_t i
, nr_choices
;
3209 tag_name
= type
->tag_name
;
3211 tag_name
= prev_field_name
;
3215 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3217 if (type
->alignment
!= 0)
3219 ret
= print_tabs(session
, nesting
);
3222 ret
= lttng_metadata_printf(session
,
3223 "variant <_%s> {\n",
3227 nr_choices
= type
->nr_choices
;
3228 for (i
= 0; i
< nr_choices
; i
++) {
3229 const struct lttng_kernel_event_field
*iter_field
;
3231 iter_field
= type
->choices
[i
];
3232 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3236 ret
= print_tabs(session
, nesting
);
3239 ret
= lttng_metadata_printf(session
,
3245 * Must be called with sessions_mutex held.
3248 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3249 const struct lttng_kernel_event_field
*field
,
3251 const char *prev_field_name
)
3255 ret
= _lttng_variant_type_statedump(session
,
3256 lttng_kernel_get_type_variant(field
->type
), nesting
,
3260 return lttng_field_name_statedump(session
, field
, nesting
);
3264 * Must be called with sessions_mutex held.
3267 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3268 const struct lttng_kernel_event_field
*field
,
3272 const struct lttng_kernel_type_array
*array_type
;
3273 const struct lttng_kernel_type_common
*elem_type
;
3275 array_type
= lttng_kernel_get_type_array(field
->type
);
3276 WARN_ON_ONCE(!array_type
);
3278 if (array_type
->alignment
) {
3279 ret
= print_tabs(session
, nesting
);
3282 ret
= lttng_metadata_printf(session
,
3283 "struct { } align(%u) _%s_padding;\n",
3284 array_type
->alignment
* CHAR_BIT
,
3290 * Nested compound types: Only array of structures and variants are
3291 * currently supported.
3293 elem_type
= array_type
->elem_type
;
3294 switch (elem_type
->type
) {
3295 case lttng_kernel_type_integer
:
3296 case lttng_kernel_type_struct
:
3297 case lttng_kernel_type_variant
:
3298 ret
= _lttng_type_statedump(session
, elem_type
,
3299 array_type
->encoding
, nesting
);
3307 ret
= lttng_metadata_printf(session
,
3310 array_type
->length
);
3315 * Must be called with sessions_mutex held.
3318 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3319 const struct lttng_kernel_event_field
*field
,
3321 const char *prev_field_name
)
3324 const char *length_name
;
3325 const struct lttng_kernel_type_sequence
*sequence_type
;
3326 const struct lttng_kernel_type_common
*elem_type
;
3328 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3329 WARN_ON_ONCE(!sequence_type
);
3331 length_name
= sequence_type
->length_name
;
3333 length_name
= prev_field_name
;
3337 if (sequence_type
->alignment
) {
3338 ret
= print_tabs(session
, nesting
);
3341 ret
= lttng_metadata_printf(session
,
3342 "struct { } align(%u) _%s_padding;\n",
3343 sequence_type
->alignment
* CHAR_BIT
,
3350 * Nested compound types: Only array of structures and variants are
3351 * currently supported.
3353 elem_type
= sequence_type
->elem_type
;
3354 switch (elem_type
->type
) {
3355 case lttng_kernel_type_integer
:
3356 case lttng_kernel_type_struct
:
3357 case lttng_kernel_type_variant
:
3358 ret
= _lttng_type_statedump(session
, elem_type
,
3359 sequence_type
->encoding
, nesting
);
3367 ret
= lttng_metadata_printf(session
,
3375 * Must be called with sessions_mutex held.
3378 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3379 const struct lttng_kernel_type_enum
*type
,
3382 const struct lttng_kernel_enum_desc
*enum_desc
;
3383 const struct lttng_kernel_type_common
*container_type
;
3385 unsigned int i
, nr_entries
;
3387 container_type
= type
->container_type
;
3388 if (container_type
->type
!= lttng_kernel_type_integer
) {
3392 enum_desc
= type
->desc
;
3393 nr_entries
= enum_desc
->nr_entries
;
3395 ret
= print_tabs(session
, nesting
);
3398 ret
= lttng_metadata_printf(session
, "enum : ");
3401 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3402 lttng_kernel_string_encoding_none
, 0);
3405 ret
= lttng_metadata_printf(session
, " {\n");
3408 /* Dump all entries */
3409 for (i
= 0; i
< nr_entries
; i
++) {
3410 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3413 ret
= print_tabs(session
, nesting
+ 1);
3416 ret
= lttng_metadata_printf(session
,
3420 len
= strlen(entry
->string
);
3421 /* Escape the character '"' */
3422 for (j
= 0; j
< len
; j
++) {
3423 char c
= entry
->string
[j
];
3427 ret
= lttng_metadata_printf(session
,
3431 ret
= lttng_metadata_printf(session
,
3435 ret
= lttng_metadata_printf(session
,
3442 ret
= lttng_metadata_printf(session
, "\"");
3446 if (entry
->options
.is_auto
) {
3447 ret
= lttng_metadata_printf(session
, ",\n");
3451 ret
= lttng_metadata_printf(session
,
3455 if (entry
->start
.signedness
)
3456 ret
= lttng_metadata_printf(session
,
3457 "%lld", (long long) entry
->start
.value
);
3459 ret
= lttng_metadata_printf(session
,
3460 "%llu", entry
->start
.value
);
3463 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3465 == entry
->end
.value
) {
3466 ret
= lttng_metadata_printf(session
,
3469 if (entry
->end
.signedness
) {
3470 ret
= lttng_metadata_printf(session
,
3472 (long long) entry
->end
.value
);
3474 ret
= lttng_metadata_printf(session
,
3483 ret
= print_tabs(session
, nesting
);
3486 ret
= lttng_metadata_printf(session
, "}");
3492 * Must be called with sessions_mutex held.
3495 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3496 const struct lttng_kernel_event_field
*field
,
3500 const struct lttng_kernel_type_enum
*enum_type
;
3502 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3503 WARN_ON_ONCE(!enum_type
);
3504 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3507 return lttng_field_name_statedump(session
, field
, nesting
);
3511 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3512 const struct lttng_kernel_event_field
*field
,
3517 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3518 lttng_kernel_string_encoding_none
, nesting
);
3521 return lttng_field_name_statedump(session
, field
, nesting
);
3525 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3526 const struct lttng_kernel_type_string
*type
,
3531 /* Default encoding is UTF8 */
3532 ret
= print_tabs(session
, nesting
);
3535 ret
= lttng_metadata_printf(session
,
3537 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3538 " { encoding = ASCII; }" : "");
3543 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3544 const struct lttng_kernel_event_field
*field
,
3547 const struct lttng_kernel_type_string
*string_type
;
3550 string_type
= lttng_kernel_get_type_string(field
->type
);
3551 WARN_ON_ONCE(!string_type
);
3552 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3555 return lttng_field_name_statedump(session
, field
, nesting
);
3559 * Must be called with sessions_mutex held.
3562 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3563 const struct lttng_kernel_type_common
*type
,
3564 enum lttng_kernel_string_encoding parent_encoding
,
3569 switch (type
->type
) {
3570 case lttng_kernel_type_integer
:
3571 ret
= _lttng_integer_type_statedump(session
,
3572 lttng_kernel_get_type_integer(type
),
3573 parent_encoding
, nesting
);
3575 case lttng_kernel_type_enum
:
3576 ret
= _lttng_enum_type_statedump(session
,
3577 lttng_kernel_get_type_enum(type
),
3580 case lttng_kernel_type_string
:
3581 ret
= _lttng_string_type_statedump(session
,
3582 lttng_kernel_get_type_string(type
),
3585 case lttng_kernel_type_struct
:
3586 ret
= _lttng_struct_type_statedump(session
,
3587 lttng_kernel_get_type_struct(type
),
3590 case lttng_kernel_type_variant
:
3591 ret
= _lttng_variant_type_statedump(session
,
3592 lttng_kernel_get_type_variant(type
),
3596 /* Nested arrays and sequences are not supported yet. */
3597 case lttng_kernel_type_array
:
3598 case lttng_kernel_type_sequence
:
3607 * Must be called with sessions_mutex held.
3610 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3611 const struct lttng_kernel_event_field
*field
,
3613 const char **prev_field_name_p
)
3615 const char *prev_field_name
= NULL
;
3618 if (prev_field_name_p
)
3619 prev_field_name
= *prev_field_name_p
;
3620 switch (field
->type
->type
) {
3621 case lttng_kernel_type_integer
:
3622 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3624 case lttng_kernel_type_enum
:
3625 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3627 case lttng_kernel_type_string
:
3628 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3630 case lttng_kernel_type_struct
:
3631 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3633 case lttng_kernel_type_array
:
3634 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3636 case lttng_kernel_type_sequence
:
3637 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3639 case lttng_kernel_type_variant
:
3640 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3647 if (prev_field_name_p
)
3648 *prev_field_name_p
= field
->name
;
3653 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3654 struct lttng_kernel_ctx
*ctx
)
3656 const char *prev_field_name
= NULL
;
3662 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3663 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3665 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3673 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3674 struct lttng_kernel_event_recorder
*event_recorder
)
3676 const char *prev_field_name
= NULL
;
3677 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3681 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3682 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3684 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3692 * Must be called with sessions_mutex held.
3693 * The entire event metadata is printed as a single atomic metadata
3697 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3698 struct lttng_kernel_channel_buffer
*chan
,
3699 struct lttng_kernel_event_recorder
*event_recorder
)
3703 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3705 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3708 lttng_metadata_begin(session
);
3710 ret
= lttng_metadata_printf(session
,
3714 " stream_id = %u;\n",
3715 event_recorder
->priv
->parent
.desc
->event_name
,
3716 event_recorder
->priv
->id
,
3717 event_recorder
->chan
->priv
->id
);
3721 ret
= lttng_metadata_printf(session
,
3722 " fields := struct {\n"
3727 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3732 * LTTng space reservation can only reserve multiples of the
3735 ret
= lttng_metadata_printf(session
,
3741 event_recorder
->priv
->metadata_dumped
= 1;
3743 lttng_metadata_end(session
);
3749 * Must be called with sessions_mutex held.
3750 * The entire channel metadata is printed as a single atomic metadata
3754 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3755 struct lttng_kernel_channel_buffer
*chan
)
3759 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3762 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3765 lttng_metadata_begin(session
);
3767 WARN_ON_ONCE(!chan
->priv
->header_type
);
3768 ret
= lttng_metadata_printf(session
,
3771 " event.header := %s;\n"
3772 " packet.context := struct packet_context;\n",
3774 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3775 "struct event_header_large");
3779 if (chan
->priv
->ctx
) {
3780 ret
= lttng_metadata_printf(session
,
3781 " event.context := struct {\n");
3785 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3788 if (chan
->priv
->ctx
) {
3789 ret
= lttng_metadata_printf(session
,
3795 ret
= lttng_metadata_printf(session
,
3798 chan
->priv
->metadata_dumped
= 1;
3800 lttng_metadata_end(session
);
3805 * Must be called with sessions_mutex held.
3808 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3810 return lttng_metadata_printf(session
,
3811 "struct packet_context {\n"
3812 " uint64_clock_monotonic_t timestamp_begin;\n"
3813 " uint64_clock_monotonic_t timestamp_end;\n"
3814 " uint64_t content_size;\n"
3815 " uint64_t packet_size;\n"
3816 " uint64_t packet_seq_num;\n"
3817 " unsigned long events_discarded;\n"
3818 " uint32_t cpu_id;\n"
3825 * id: range: 0 - 30.
3826 * id 31 is reserved to indicate an extended header.
3829 * id: range: 0 - 65534.
3830 * id 65535 is reserved to indicate an extended header.
3832 * Must be called with sessions_mutex held.
3835 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3837 return lttng_metadata_printf(session
,
3838 "struct event_header_compact {\n"
3839 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3842 " uint27_clock_monotonic_t timestamp;\n"
3846 " uint64_clock_monotonic_t timestamp;\n"
3851 "struct event_header_large {\n"
3852 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3855 " uint32_clock_monotonic_t timestamp;\n"
3859 " uint64_clock_monotonic_t timestamp;\n"
3863 lttng_alignof(uint32_t) * CHAR_BIT
,
3864 lttng_alignof(uint16_t) * CHAR_BIT
3869 * Approximation of NTP time of day to clock monotonic correlation,
3870 * taken at start of trace.
3871 * Yes, this is only an approximation. Yes, we can (and will) do better
3872 * in future versions.
3873 * This function may return a negative offset. It may happen if the
3874 * system sets the REALTIME clock to 0 after boot.
3876 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3880 int64_t measure_clock_offset(void)
3882 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3883 uint64_t tcf
= trace_clock_freq();
3885 unsigned long flags
;
3886 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3887 struct timespec64 rts
= { 0, 0 };
3889 struct timespec rts
= { 0, 0 };
3892 /* Disable interrupts to increase correlation precision. */
3893 local_irq_save(flags
);
3894 monotonic
[0] = trace_clock_read64();
3895 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3896 ktime_get_real_ts64(&rts
);
3898 getnstimeofday(&rts
);
3900 monotonic
[1] = trace_clock_read64();
3901 local_irq_restore(flags
);
3903 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3904 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3905 if (tcf
== NSEC_PER_SEC
) {
3906 realtime
+= rts
.tv_nsec
;
3908 uint64_t n
= rts
.tv_nsec
* tcf
;
3910 do_div(n
, NSEC_PER_SEC
);
3913 offset
= (int64_t) realtime
- monotonic_avg
;
3918 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3926 while (cur
!= '\0') {
3929 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3933 ret
= lttng_metadata_printf(session
, "%c", '\\');
3936 /* We still print the current char */
3939 ret
= lttng_metadata_printf(session
, "%c", cur
);
3953 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3954 const char *field_value
)
3958 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3962 ret
= print_escaped_ctf_string(session
, field_value
);
3966 ret
= lttng_metadata_printf(session
, "\";\n");
3973 * Output metadata into this session's metadata buffers.
3974 * Must be called with sessions_mutex held.
3977 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3979 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3980 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3981 const char *product_uuid
;
3982 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3983 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3986 if (!LTTNG_READ_ONCE(session
->active
))
3989 lttng_metadata_begin(session
);
3991 if (session
->priv
->metadata_dumped
)
3994 snprintf(uuid_s
, sizeof(uuid_s
),
3995 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3996 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3997 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3998 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3999 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
4001 ret
= lttng_metadata_printf(session
,
4002 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
4003 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
4004 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
4005 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
4006 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
4007 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
4008 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
4014 " byte_order = %s;\n"
4015 " packet.header := struct {\n"
4016 " uint32_t magic;\n"
4017 " uint8_t uuid[16];\n"
4018 " uint32_t stream_id;\n"
4019 " uint64_t stream_instance_id;\n"
4022 lttng_alignof(uint8_t) * CHAR_BIT
,
4023 lttng_alignof(uint16_t) * CHAR_BIT
,
4024 lttng_alignof(uint32_t) * CHAR_BIT
,
4025 lttng_alignof(uint64_t) * CHAR_BIT
,
4026 sizeof(unsigned long) * CHAR_BIT
,
4027 lttng_alignof(unsigned long) * CHAR_BIT
,
4031 #if __BYTE_ORDER == __BIG_ENDIAN
4040 ret
= lttng_metadata_printf(session
,
4042 " hostname = \"%s\";\n"
4043 " domain = \"kernel\";\n"
4044 " sysname = \"%s\";\n"
4045 " kernel_release = \"%s\";\n"
4046 " kernel_version = \"%s\";\n"
4047 " tracer_name = \"lttng-modules\";\n"
4048 " tracer_major = %d;\n"
4049 " tracer_minor = %d;\n"
4050 " tracer_patchlevel = %d;\n"
4051 " trace_buffering_scheme = \"global\";\n",
4052 current
->nsproxy
->uts_ns
->name
.nodename
,
4056 LTTNG_MODULES_MAJOR_VERSION
,
4057 LTTNG_MODULES_MINOR_VERSION
,
4058 LTTNG_MODULES_PATCHLEVEL_VERSION
4063 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4066 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4067 session
->priv
->creation_time
);
4071 /* Add the product UUID to the 'env' section */
4072 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4074 ret
= lttng_metadata_printf(session
,
4075 " product_uuid = \"%s\";\n",
4082 /* Close the 'env' section */
4083 ret
= lttng_metadata_printf(session
, "};\n\n");
4087 ret
= lttng_metadata_printf(session
,
4089 " name = \"%s\";\n",
4095 if (!trace_clock_uuid(clock_uuid_s
)) {
4096 ret
= lttng_metadata_printf(session
,
4097 " uuid = \"%s\";\n",
4104 ret
= lttng_metadata_printf(session
,
4105 " description = \"%s\";\n"
4106 " freq = %llu; /* Frequency, in Hz */\n"
4107 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4110 trace_clock_description(),
4111 (unsigned long long) trace_clock_freq(),
4112 (long long) measure_clock_offset()
4117 ret
= lttng_metadata_printf(session
,
4118 "typealias integer {\n"
4119 " size = 27; align = 1; signed = false;\n"
4120 " map = clock.%s.value;\n"
4121 "} := uint27_clock_monotonic_t;\n"
4123 "typealias integer {\n"
4124 " size = 32; align = %u; signed = false;\n"
4125 " map = clock.%s.value;\n"
4126 "} := uint32_clock_monotonic_t;\n"
4128 "typealias integer {\n"
4129 " size = 64; align = %u; signed = false;\n"
4130 " map = clock.%s.value;\n"
4131 "} := uint64_clock_monotonic_t;\n\n",
4133 lttng_alignof(uint32_t) * CHAR_BIT
,
4135 lttng_alignof(uint64_t) * CHAR_BIT
,
4141 ret
= _lttng_stream_packet_context_declare(session
);
4145 ret
= _lttng_event_header_declare(session
);
4150 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4151 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4156 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4157 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4158 event_recorder_priv
->pub
);
4162 session
->priv
->metadata_dumped
= 1;
4164 lttng_metadata_end(session
);
4169 * lttng_transport_register - LTT transport registration
4170 * @transport: transport structure
4172 * Registers a transport which can be used as output to extract the data out of
4173 * LTTng. The module calling this registration function must ensure that no
4174 * trap-inducing code will be executed by the transport functions. E.g.
4175 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4176 * is made visible to the transport function. This registration acts as a
4177 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4178 * after its registration must it synchronize the TLBs.
4180 void lttng_transport_register(struct lttng_transport
*transport
)
4183 * Make sure no page fault can be triggered by the module about to be
4184 * registered. We deal with this here so we don't have to call
4185 * vmalloc_sync_mappings() in each module's init.
4187 wrapper_vmalloc_sync_mappings();
4189 mutex_lock(&sessions_mutex
);
4190 list_add_tail(&transport
->node
, <tng_transport_list
);
4191 mutex_unlock(&sessions_mutex
);
4193 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4196 * lttng_transport_unregister - LTT transport unregistration
4197 * @transport: transport structure
4199 void lttng_transport_unregister(struct lttng_transport
*transport
)
4201 mutex_lock(&sessions_mutex
);
4202 list_del(&transport
->node
);
4203 mutex_unlock(&sessions_mutex
);
4205 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4207 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4210 * Make sure no page fault can be triggered by the module about to be
4211 * registered. We deal with this here so we don't have to call
4212 * vmalloc_sync_mappings() in each module's init.
4214 wrapper_vmalloc_sync_mappings();
4216 mutex_lock(&sessions_mutex
);
4217 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4218 mutex_unlock(&sessions_mutex
);
4220 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4222 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4224 mutex_lock(&sessions_mutex
);
4225 list_del(&transport
->node
);
4226 mutex_unlock(&sessions_mutex
);
4228 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4230 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4232 enum cpuhp_state lttng_hp_prepare
;
4233 enum cpuhp_state lttng_hp_online
;
4235 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4237 struct lttng_cpuhp_node
*lttng_node
;
4239 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4240 switch (lttng_node
->component
) {
4241 case LTTNG_RING_BUFFER_FRONTEND
:
4243 case LTTNG_RING_BUFFER_BACKEND
:
4244 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4245 case LTTNG_RING_BUFFER_ITER
:
4247 case LTTNG_CONTEXT_PERF_COUNTERS
:
4254 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4256 struct lttng_cpuhp_node
*lttng_node
;
4258 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4259 switch (lttng_node
->component
) {
4260 case LTTNG_RING_BUFFER_FRONTEND
:
4261 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4262 case LTTNG_RING_BUFFER_BACKEND
:
4264 case LTTNG_RING_BUFFER_ITER
:
4266 case LTTNG_CONTEXT_PERF_COUNTERS
:
4267 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4273 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4275 struct lttng_cpuhp_node
*lttng_node
;
4277 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4278 switch (lttng_node
->component
) {
4279 case LTTNG_RING_BUFFER_FRONTEND
:
4280 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4281 case LTTNG_RING_BUFFER_BACKEND
:
4283 case LTTNG_RING_BUFFER_ITER
:
4284 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4285 case LTTNG_CONTEXT_PERF_COUNTERS
:
4286 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4292 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4294 struct lttng_cpuhp_node
*lttng_node
;
4296 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4297 switch (lttng_node
->component
) {
4298 case LTTNG_RING_BUFFER_FRONTEND
:
4299 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4300 case LTTNG_RING_BUFFER_BACKEND
:
4302 case LTTNG_RING_BUFFER_ITER
:
4304 case LTTNG_CONTEXT_PERF_COUNTERS
:
4311 static int __init
lttng_init_cpu_hotplug(void)
4315 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4316 lttng_hotplug_prepare
,
4317 lttng_hotplug_dead
);
4321 lttng_hp_prepare
= ret
;
4322 lttng_rb_set_hp_prepare(ret
);
4324 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4325 lttng_hotplug_online
,
4326 lttng_hotplug_offline
);
4328 cpuhp_remove_multi_state(lttng_hp_prepare
);
4329 lttng_hp_prepare
= 0;
4332 lttng_hp_online
= ret
;
4333 lttng_rb_set_hp_online(ret
);
4338 static void __exit
lttng_exit_cpu_hotplug(void)
4340 lttng_rb_set_hp_online(0);
4341 cpuhp_remove_multi_state(lttng_hp_online
);
4342 lttng_rb_set_hp_prepare(0);
4343 cpuhp_remove_multi_state(lttng_hp_prepare
);
4346 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4347 static int lttng_init_cpu_hotplug(void)
4351 static void lttng_exit_cpu_hotplug(void)
4354 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4356 static int __init
lttng_events_init(void)
4360 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4363 ret
= wrapper_get_pfnblock_flags_mask_init();
4366 ret
= wrapper_get_pageblock_flags_mask_init();
4369 ret
= lttng_probes_init();
4372 ret
= lttng_context_init();
4375 ret
= lttng_tracepoint_init();
4378 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4379 if (!event_recorder_cache
) {
4381 goto error_kmem_event_recorder
;
4383 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4384 if (!event_recorder_private_cache
) {
4386 goto error_kmem_event_recorder_private
;
4388 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4389 if (!event_notifier_cache
) {
4391 goto error_kmem_event_notifier
;
4393 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4394 if (!event_notifier_private_cache
) {
4396 goto error_kmem_event_notifier_private
;
4398 ret
= lttng_abi_init();
4401 ret
= lttng_logger_init();
4404 ret
= lttng_init_cpu_hotplug();
4407 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4408 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4409 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4410 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4411 LTTNG_MODULES_EXTRAVERSION
,
4413 #ifdef LTTNG_EXTRA_VERSION_GIT
4414 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4418 #ifdef LTTNG_EXTRA_VERSION_NAME
4419 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4423 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4424 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4425 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4429 lttng_logger_exit();
4433 kmem_cache_destroy(event_notifier_private_cache
);
4434 error_kmem_event_notifier_private
:
4435 kmem_cache_destroy(event_notifier_cache
);
4436 error_kmem_event_notifier
:
4437 kmem_cache_destroy(event_recorder_private_cache
);
4438 error_kmem_event_recorder_private
:
4439 kmem_cache_destroy(event_recorder_cache
);
4440 error_kmem_event_recorder
:
4441 lttng_tracepoint_exit();
4443 lttng_context_exit();
4444 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4445 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4446 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4447 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4448 LTTNG_MODULES_EXTRAVERSION
,
4450 #ifdef LTTNG_EXTRA_VERSION_GIT
4451 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4455 #ifdef LTTNG_EXTRA_VERSION_NAME
4456 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4463 module_init(lttng_events_init
);
4465 static void __exit
lttng_events_exit(void)
4467 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4469 lttng_exit_cpu_hotplug();
4470 lttng_logger_exit();
4472 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4473 lttng_session_destroy(session_priv
->pub
);
4474 kmem_cache_destroy(event_recorder_cache
);
4475 kmem_cache_destroy(event_recorder_private_cache
);
4476 kmem_cache_destroy(event_notifier_cache
);
4477 kmem_cache_destroy(event_notifier_private_cache
);
4478 lttng_tracepoint_exit();
4479 lttng_context_exit();
4480 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4481 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4482 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4483 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4484 LTTNG_MODULES_EXTRAVERSION
,
4486 #ifdef LTTNG_EXTRA_VERSION_GIT
4487 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4491 #ifdef LTTNG_EXTRA_VERSION_NAME
4492 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4498 module_exit(lttng_events_exit
);
4500 #include <generated/patches.h>
4501 #ifdef LTTNG_EXTRA_VERSION_GIT
4502 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4504 #ifdef LTTNG_EXTRA_VERSION_NAME
4505 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4507 MODULE_LICENSE("GPL and additional rights");
4508 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4509 MODULE_DESCRIPTION("LTTng tracer");
4510 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4511 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4512 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4513 LTTNG_MODULES_EXTRAVERSION
);