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/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/events-internal.h>
40 #include <lttng/lttng-bytecode.h>
41 #include <lttng/tracer.h>
42 #include <lttng/event-notifier-notification.h>
43 #include <lttng/abi-old.h>
44 #include <lttng/endian.h>
45 #include <lttng/string-utils.h>
46 #include <lttng/utils.h>
47 #include <ringbuffer/backend.h>
48 #include <ringbuffer/frontend.h>
49 #include <wrapper/time.h>
51 #define METADATA_CACHE_DEFAULT_SIZE 4096
53 static LIST_HEAD(sessions
);
54 static LIST_HEAD(event_notifier_groups
);
55 static LIST_HEAD(lttng_transport_list
);
56 static LIST_HEAD(lttng_counter_transport_list
);
58 * Protect the sessions and metadata caches.
60 static DEFINE_MUTEX(sessions_mutex
);
61 static struct kmem_cache
*event_recorder_cache
;
62 static struct kmem_cache
*event_recorder_private_cache
;
63 static struct kmem_cache
*event_notifier_cache
;
64 static struct kmem_cache
*event_notifier_private_cache
;
66 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
67 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
68 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
69 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
70 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event
);
75 static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier
*event_notifier
);
77 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
78 struct lttng_kernel_channel_buffer
*chan
,
79 struct lttng_kernel_event_recorder
*event
);
81 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
83 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
85 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
86 const struct lttng_kernel_type_common
*type
,
87 enum lttng_kernel_string_encoding parent_encoding
,
90 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
91 const struct lttng_kernel_event_field
*field
,
92 size_t nesting
, const char **prev_field_name_p
);
94 void synchronize_trace(void)
96 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
97 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
103 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
104 #ifdef CONFIG_PREEMPT_RT_FULL
107 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
108 #ifdef CONFIG_PREEMPT_RT
111 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
114 void lttng_lock_sessions(void)
116 mutex_lock(&sessions_mutex
);
119 void lttng_unlock_sessions(void)
121 mutex_unlock(&sessions_mutex
);
124 static struct lttng_transport
*lttng_transport_find(const char *name
)
126 struct lttng_transport
*transport
;
128 list_for_each_entry(transport
, <tng_transport_list
, node
) {
129 if (!strcmp(transport
->name
, name
))
136 * Called with sessions lock held.
138 int lttng_session_active(void)
140 struct lttng_kernel_session_private
*iter
;
142 list_for_each_entry(iter
, &sessions
, list
) {
143 if (iter
->pub
->active
)
149 struct lttng_kernel_session
*lttng_session_create(void)
151 struct lttng_kernel_session
*session
;
152 struct lttng_kernel_session_private
*session_priv
;
153 struct lttng_metadata_cache
*metadata_cache
;
156 mutex_lock(&sessions_mutex
);
157 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
160 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
162 goto err_free_session
;
163 session
->priv
= session_priv
;
164 session_priv
->pub
= session
;
166 INIT_LIST_HEAD(&session_priv
->chan
);
167 INIT_LIST_HEAD(&session_priv
->events
);
168 lttng_guid_gen(&session_priv
->uuid
);
170 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
173 goto err_free_session_private
;
174 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
175 if (!metadata_cache
->data
)
177 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
178 kref_init(&metadata_cache
->refcount
);
179 mutex_init(&metadata_cache
->lock
);
180 session_priv
->metadata_cache
= metadata_cache
;
181 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
182 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
183 sizeof(metadata_cache
->uuid
));
184 INIT_LIST_HEAD(&session_priv
->enablers_head
);
185 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
186 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
187 list_add(&session_priv
->list
, &sessions
);
189 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
190 goto tracker_alloc_error
;
191 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
192 goto tracker_alloc_error
;
193 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
194 goto tracker_alloc_error
;
195 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
196 goto tracker_alloc_error
;
197 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
198 goto tracker_alloc_error
;
199 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
200 goto tracker_alloc_error
;
202 mutex_unlock(&sessions_mutex
);
207 lttng_id_tracker_fini(&session
->pid_tracker
);
208 lttng_id_tracker_fini(&session
->vpid_tracker
);
209 lttng_id_tracker_fini(&session
->uid_tracker
);
210 lttng_id_tracker_fini(&session
->vuid_tracker
);
211 lttng_id_tracker_fini(&session
->gid_tracker
);
212 lttng_id_tracker_fini(&session
->vgid_tracker
);
214 kfree(metadata_cache
);
215 err_free_session_private
:
216 lttng_kvfree(session_priv
);
218 lttng_kvfree(session
);
220 mutex_unlock(&sessions_mutex
);
225 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
227 struct lttng_counter_transport
*transport
;
229 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
230 if (!strcmp(transport
->name
, name
))
236 struct lttng_counter
*lttng_kernel_counter_create(
237 const char *counter_transport_name
,
238 size_t number_dimensions
, const size_t *dimensions_sizes
)
240 struct lttng_counter
*counter
= NULL
;
241 struct lttng_counter_transport
*counter_transport
= NULL
;
243 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
244 if (!counter_transport
) {
245 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
246 counter_transport_name
);
249 if (!try_module_get(counter_transport
->owner
)) {
250 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
254 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
258 /* Create event notifier error counter. */
259 counter
->ops
= &counter_transport
->ops
;
260 counter
->transport
= counter_transport
;
262 counter
->counter
= counter
->ops
->counter_create(
263 number_dimensions
, dimensions_sizes
, 0);
264 if (!counter
->counter
) {
271 lttng_kvfree(counter
);
273 if (counter_transport
)
274 module_put(counter_transport
->owner
);
279 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
281 struct lttng_transport
*transport
= NULL
;
282 struct lttng_event_notifier_group
*event_notifier_group
;
283 const char *transport_name
= "relay-event-notifier";
284 size_t subbuf_size
= 4096; //TODO
285 size_t num_subbuf
= 16; //TODO
286 unsigned int switch_timer_interval
= 0;
287 unsigned int read_timer_interval
= 0;
290 mutex_lock(&sessions_mutex
);
292 transport
= lttng_transport_find(transport_name
);
294 printk(KERN_WARNING
"LTTng: transport %s not found\n",
298 if (!try_module_get(transport
->owner
)) {
299 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
304 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
306 if (!event_notifier_group
)
310 * Initialize the ring buffer used to store event notifier
313 event_notifier_group
->ops
= &transport
->ops
;
314 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
315 transport_name
, event_notifier_group
, NULL
,
316 subbuf_size
, num_subbuf
, switch_timer_interval
,
317 read_timer_interval
);
318 if (!event_notifier_group
->chan
)
321 event_notifier_group
->transport
= transport
;
323 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
324 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
325 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
326 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
328 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
330 mutex_unlock(&sessions_mutex
);
332 return event_notifier_group
;
335 lttng_kvfree(event_notifier_group
);
338 module_put(transport
->owner
);
340 mutex_unlock(&sessions_mutex
);
344 void metadata_cache_destroy(struct kref
*kref
)
346 struct lttng_metadata_cache
*cache
=
347 container_of(kref
, struct lttng_metadata_cache
, refcount
);
352 void lttng_session_destroy(struct lttng_kernel_session
*session
)
354 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
355 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
356 struct lttng_metadata_stream
*metadata_stream
;
357 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
360 mutex_lock(&sessions_mutex
);
361 WRITE_ONCE(session
->active
, 0);
362 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
363 ret
= lttng_syscalls_unregister_channel(chan_priv
->pub
);
366 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
367 ret
= _lttng_event_unregister(event_recorder_priv
->pub
);
370 synchronize_trace(); /* Wait for in-flight events to complete */
371 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
372 ret
= lttng_syscalls_destroy_event(chan_priv
->pub
);
375 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
376 &session
->priv
->enablers_head
, node
)
377 lttng_event_enabler_destroy(event_enabler
);
378 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, node
)
379 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
380 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
381 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
382 _lttng_channel_destroy(chan_priv
->pub
);
384 mutex_lock(&session
->priv
->metadata_cache
->lock
);
385 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
386 _lttng_metadata_channel_hangup(metadata_stream
);
387 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
388 lttng_id_tracker_fini(&session
->pid_tracker
);
389 lttng_id_tracker_fini(&session
->vpid_tracker
);
390 lttng_id_tracker_fini(&session
->uid_tracker
);
391 lttng_id_tracker_fini(&session
->vuid_tracker
);
392 lttng_id_tracker_fini(&session
->gid_tracker
);
393 lttng_id_tracker_fini(&session
->vgid_tracker
);
394 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
395 list_del(&session
->priv
->list
);
396 mutex_unlock(&sessions_mutex
);
397 lttng_kvfree(session
->priv
);
398 lttng_kvfree(session
);
401 void lttng_event_notifier_group_destroy(
402 struct lttng_event_notifier_group
*event_notifier_group
)
404 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
405 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
408 if (!event_notifier_group
)
411 mutex_lock(&sessions_mutex
);
413 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
416 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
417 &event_notifier_group
->event_notifiers_head
, node
) {
418 ret
= _lttng_event_notifier_unregister(event_notifier_priv
->pub
);
422 /* Wait for in-flight event notifier to complete */
425 irq_work_sync(&event_notifier_group
->wakeup_pending
);
427 kfree(event_notifier_group
->sc_filter
);
429 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
430 &event_notifier_group
->enablers_head
, node
)
431 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
433 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
434 &event_notifier_group
->event_notifiers_head
, node
)
435 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
437 if (event_notifier_group
->error_counter
) {
438 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
440 error_counter
->ops
->counter_destroy(error_counter
->counter
);
441 module_put(error_counter
->transport
->owner
);
442 lttng_kvfree(error_counter
);
443 event_notifier_group
->error_counter
= NULL
;
446 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
447 module_put(event_notifier_group
->transport
->owner
);
448 list_del(&event_notifier_group
->node
);
450 mutex_unlock(&sessions_mutex
);
451 lttng_kvfree(event_notifier_group
);
454 int lttng_session_statedump(struct lttng_kernel_session
*session
)
458 mutex_lock(&sessions_mutex
);
459 ret
= lttng_statedump_start(session
);
460 mutex_unlock(&sessions_mutex
);
464 int lttng_session_enable(struct lttng_kernel_session
*session
)
467 struct lttng_kernel_channel_buffer_private
*chan_priv
;
469 mutex_lock(&sessions_mutex
);
470 if (session
->active
) {
475 /* Set transient enabler state to "enabled" */
476 session
->priv
->tstate
= 1;
478 /* We need to sync enablers with session before activation. */
479 lttng_session_sync_event_enablers(session
);
482 * Snapshot the number of events per channel to know the type of header
485 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
486 if (chan_priv
->header_type
)
487 continue; /* don't change it if session stop/restart */
488 if (chan_priv
->free_event_id
< 31)
489 chan_priv
->header_type
= 1; /* compact */
491 chan_priv
->header_type
= 2; /* large */
494 /* Clear each stream's quiescent state. */
495 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
496 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
497 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
500 WRITE_ONCE(session
->active
, 1);
501 WRITE_ONCE(session
->priv
->been_active
, 1);
502 ret
= _lttng_session_metadata_statedump(session
);
504 WRITE_ONCE(session
->active
, 0);
507 ret
= lttng_statedump_start(session
);
509 WRITE_ONCE(session
->active
, 0);
511 mutex_unlock(&sessions_mutex
);
515 int lttng_session_disable(struct lttng_kernel_session
*session
)
518 struct lttng_kernel_channel_buffer_private
*chan_priv
;
520 mutex_lock(&sessions_mutex
);
521 if (!session
->active
) {
525 WRITE_ONCE(session
->active
, 0);
527 /* Set transient enabler state to "disabled" */
528 session
->priv
->tstate
= 0;
529 lttng_session_sync_event_enablers(session
);
531 /* Set each stream's quiescent state. */
532 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
533 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
534 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
537 mutex_unlock(&sessions_mutex
);
541 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
544 struct lttng_kernel_channel_buffer_private
*chan_priv
;
545 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
546 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
547 struct lttng_metadata_stream
*stream
;
549 mutex_lock(&sessions_mutex
);
550 if (!session
->active
) {
555 mutex_lock(&cache
->lock
);
556 memset(cache
->data
, 0, cache
->cache_alloc
);
557 cache
->metadata_written
= 0;
559 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
560 stream
->metadata_out
= 0;
561 stream
->metadata_in
= 0;
563 mutex_unlock(&cache
->lock
);
565 session
->priv
->metadata_dumped
= 0;
566 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
567 chan_priv
->metadata_dumped
= 0;
570 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
571 event_recorder_priv
->metadata_dumped
= 0;
574 ret
= _lttng_session_metadata_statedump(session
);
577 mutex_unlock(&sessions_mutex
);
581 int lttng_channel_enable(struct lttng_kernel_channel_buffer
*channel
)
585 mutex_lock(&sessions_mutex
);
586 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
590 if (channel
->parent
.enabled
) {
594 /* Set transient enabler state to "enabled" */
595 channel
->priv
->parent
.tstate
= 1;
596 lttng_session_sync_event_enablers(channel
->parent
.session
);
597 /* Set atomically the state to "enabled" */
598 WRITE_ONCE(channel
->parent
.enabled
, 1);
600 mutex_unlock(&sessions_mutex
);
604 int lttng_channel_disable(struct lttng_kernel_channel_buffer
*channel
)
608 mutex_lock(&sessions_mutex
);
609 if (channel
->priv
->channel_type
== METADATA_CHANNEL
) {
613 if (!channel
->parent
.enabled
) {
617 /* Set atomically the state to "disabled" */
618 WRITE_ONCE(channel
->parent
.enabled
, 0);
619 /* Set transient enabler state to "enabled" */
620 channel
->priv
->parent
.tstate
= 0;
621 lttng_session_sync_event_enablers(channel
->parent
.session
);
623 mutex_unlock(&sessions_mutex
);
627 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
631 mutex_lock(&sessions_mutex
);
632 switch (event
->type
) {
633 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
635 struct lttng_kernel_event_recorder
*event_recorder
=
636 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
638 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
644 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
645 switch (event
->priv
->instrumentation
) {
646 case LTTNG_KERNEL_ABI_KRETPROBE
:
657 if (event
->enabled
) {
661 switch (event
->priv
->instrumentation
) {
662 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
663 case LTTNG_KERNEL_ABI_SYSCALL
:
667 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
668 case LTTNG_KERNEL_ABI_UPROBE
:
669 WRITE_ONCE(event
->enabled
, 1);
672 case LTTNG_KERNEL_ABI_KRETPROBE
:
673 ret
= lttng_kretprobes_event_enable_state(event
, 1);
676 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
677 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
683 mutex_unlock(&sessions_mutex
);
687 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
691 mutex_lock(&sessions_mutex
);
692 switch (event
->type
) {
693 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
695 struct lttng_kernel_event_recorder
*event_recorder
=
696 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
698 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
704 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
705 switch (event
->priv
->instrumentation
) {
706 case LTTNG_KERNEL_ABI_KRETPROBE
:
717 if (!event
->enabled
) {
721 switch (event
->priv
->instrumentation
) {
722 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
723 case LTTNG_KERNEL_ABI_SYSCALL
:
727 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
728 case LTTNG_KERNEL_ABI_UPROBE
:
729 WRITE_ONCE(event
->enabled
, 0);
732 case LTTNG_KERNEL_ABI_KRETPROBE
:
733 ret
= lttng_kretprobes_event_enable_state(event
, 0);
736 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
737 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
743 mutex_unlock(&sessions_mutex
);
747 struct lttng_kernel_channel_buffer
*lttng_channel_create(struct lttng_kernel_session
*session
,
748 const char *transport_name
,
750 size_t subbuf_size
, size_t num_subbuf
,
751 unsigned int switch_timer_interval
,
752 unsigned int read_timer_interval
,
753 enum channel_type channel_type
)
755 struct lttng_kernel_channel_buffer
*chan
;
756 struct lttng_kernel_channel_buffer_private
*chan_priv
;
757 struct lttng_transport
*transport
= NULL
;
759 mutex_lock(&sessions_mutex
);
760 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
761 goto active
; /* Refuse to add channel to active session */
762 transport
= lttng_transport_find(transport_name
);
764 printk(KERN_WARNING
"LTTng: transport %s not found\n",
768 if (!try_module_get(transport
->owner
)) {
769 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
772 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
775 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
778 chan
->priv
= chan_priv
;
779 chan_priv
->pub
= chan
;
780 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
781 chan
->parent
.session
= session
;
782 chan
->priv
->id
= session
->priv
->free_chan_id
++;
783 chan
->ops
= &transport
->ops
;
785 * Note: the channel creation op already writes into the packet
786 * headers. Therefore the "chan" information used as input
787 * should be already accessible.
789 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
790 chan
, buf_addr
, subbuf_size
, num_subbuf
,
791 switch_timer_interval
, read_timer_interval
);
792 if (!chan
->priv
->rb_chan
)
794 chan
->priv
->parent
.tstate
= 1;
795 chan
->parent
.enabled
= 1;
796 chan
->priv
->transport
= transport
;
797 chan
->priv
->channel_type
= channel_type
;
798 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
799 mutex_unlock(&sessions_mutex
);
808 module_put(transport
->owner
);
811 mutex_unlock(&sessions_mutex
);
816 * Only used internally at session destruction for per-cpu channels, and
817 * when metadata channel is released.
818 * Needs to be called with sessions mutex held.
821 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
823 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
824 module_put(chan
->priv
->transport
->owner
);
825 list_del(&chan
->priv
->node
);
826 lttng_kernel_destroy_context(chan
->priv
->ctx
);
831 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
833 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
835 /* Protect the metadata cache with the sessions_mutex. */
836 mutex_lock(&sessions_mutex
);
837 _lttng_channel_destroy(chan
);
838 mutex_unlock(&sessions_mutex
);
840 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
843 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
845 stream
->finalized
= 1;
846 wake_up_interruptible(&stream
->read_wait
);
851 * Supports event creation while tracing session is active.
852 * Needs to be called with sessions mutex held.
854 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
855 struct lttng_kernel_abi_event
*event_param
,
856 const struct lttng_kernel_event_desc
*event_desc
,
857 enum lttng_kernel_abi_instrumentation itype
)
859 struct lttng_kernel_session
*session
= chan
->parent
.session
;
860 struct lttng_kernel_event_recorder
*event_recorder
;
861 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
862 const char *event_name
;
863 struct hlist_head
*head
;
866 if (chan
->priv
->free_event_id
== -1U) {
872 case LTTNG_KERNEL_ABI_TRACEPOINT
:
873 event_name
= event_desc
->event_name
;
876 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
877 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
878 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
879 case LTTNG_KERNEL_ABI_SYSCALL
:
880 event_name
= event_param
->name
;
883 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
884 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
891 head
= utils_borrow_hash_table_bucket(session
->priv
->events_ht
.table
,
892 LTTNG_EVENT_HT_SIZE
, event_name
);
893 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
894 WARN_ON_ONCE(!event_recorder_priv
->parent
.desc
);
895 if (!strncmp(event_recorder_priv
->parent
.desc
->event_name
, event_name
,
896 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
897 && chan
== event_recorder_priv
->pub
->chan
) {
903 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
904 if (!event_recorder
) {
908 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
909 if (!event_recorder_priv
) {
911 goto cache_private_error
;
913 event_recorder_priv
->pub
= event_recorder
;
914 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
915 event_recorder
->priv
= event_recorder_priv
;
916 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
917 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
919 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
920 event_recorder
->chan
= chan
;
921 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
922 event_recorder
->priv
->parent
.instrumentation
= itype
;
923 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
924 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
927 case LTTNG_KERNEL_ABI_TRACEPOINT
:
928 /* Event will be enabled by enabler sync. */
929 event_recorder
->parent
.enabled
= 0;
930 event_recorder
->priv
->parent
.registered
= 0;
931 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
932 if (!event_recorder
->priv
->parent
.desc
) {
936 /* Populate lttng_event structure before event registration. */
940 case LTTNG_KERNEL_ABI_KPROBE
:
942 * Needs to be explicitly enabled after creation, since
943 * we may want to apply filters.
945 event_recorder
->parent
.enabled
= 0;
946 event_recorder
->priv
->parent
.registered
= 1;
948 * Populate lttng_event structure before event
952 ret
= lttng_kprobes_register_event(event_name
,
953 event_param
->u
.kprobe
.symbol_name
,
954 event_param
->u
.kprobe
.offset
,
955 event_param
->u
.kprobe
.addr
,
961 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
965 case LTTNG_KERNEL_ABI_KRETPROBE
:
967 struct lttng_kernel_event_recorder
*event_recorder_return
;
968 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
970 /* kretprobe defines 2 events */
972 * Needs to be explicitly enabled after creation, since
973 * we may want to apply filters.
975 event_recorder
->parent
.enabled
= 0;
976 event_recorder
->priv
->parent
.registered
= 1;
978 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
979 if (!event_recorder_return
) {
983 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
984 if (!event_recorder_return_priv
) {
985 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
989 event_recorder_return_priv
->pub
= event_recorder_return
;
990 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
991 event_recorder_return
->priv
= event_recorder_return_priv
;
992 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
993 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
995 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
996 event_recorder_return
->chan
= chan
;
997 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
998 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
999 event_recorder_return
->parent
.enabled
= 0;
1000 event_recorder_return
->priv
->parent
.registered
= 1;
1001 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1002 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1004 * Populate lttng_event structure before kretprobe registration.
1007 ret
= lttng_kretprobes_register(event_name
,
1008 event_param
->u
.kretprobe
.symbol_name
,
1009 event_param
->u
.kretprobe
.offset
,
1010 event_param
->u
.kretprobe
.addr
,
1011 event_recorder
, event_recorder_return
);
1013 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1014 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1016 goto register_error
;
1018 /* Take 2 refs on the module: one per event. */
1019 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1021 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1023 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1024 event_recorder_return
);
1025 WARN_ON_ONCE(ret
> 0);
1027 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1028 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1029 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1030 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1031 goto statedump_error
;
1033 list_add(&event_recorder_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1037 case LTTNG_KERNEL_ABI_SYSCALL
:
1039 * Needs to be explicitly enabled after creation, since
1040 * we may want to apply filters.
1042 event_recorder
->parent
.enabled
= 0;
1043 event_recorder
->priv
->parent
.registered
= 0;
1044 event_recorder
->priv
->parent
.desc
= event_desc
;
1045 switch (event_param
->u
.syscall
.entryexit
) {
1046 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1048 goto register_error
;
1049 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1050 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1052 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1053 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1056 switch (event_param
->u
.syscall
.abi
) {
1057 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1059 goto register_error
;
1060 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1061 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1063 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1064 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1067 if (!event_recorder
->priv
->parent
.desc
) {
1069 goto register_error
;
1073 case LTTNG_KERNEL_ABI_UPROBE
:
1075 * Needs to be explicitly enabled after creation, since
1076 * we may want to apply filters.
1078 event_recorder
->parent
.enabled
= 0;
1079 event_recorder
->priv
->parent
.registered
= 1;
1082 * Populate lttng_event structure before event
1087 ret
= lttng_uprobes_register_event(event_param
->name
,
1088 event_param
->u
.uprobe
.fd
,
1091 goto register_error
;
1092 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1096 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1097 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1101 goto register_error
;
1103 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1104 WARN_ON_ONCE(ret
> 0);
1106 goto statedump_error
;
1108 hlist_add_head(&event_recorder
->priv
->hlist
, head
);
1109 list_add(&event_recorder
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1110 return event_recorder
;
1113 /* If a statedump error occurs, events will not be readable. */
1115 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1116 cache_private_error
:
1117 kmem_cache_free(event_recorder_cache
, event_recorder
);
1122 return ERR_PTR(ret
);
1125 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(
1126 const struct lttng_kernel_event_desc
*event_desc
,
1127 uint64_t token
, uint64_t error_counter_index
,
1128 struct lttng_event_notifier_group
*event_notifier_group
,
1129 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1130 enum lttng_kernel_abi_instrumentation itype
)
1132 struct lttng_kernel_event_notifier
*event_notifier
;
1133 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1134 struct lttng_counter
*error_counter
;
1135 const char *event_name
;
1136 struct hlist_head
*head
;
1140 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1141 event_name
= event_desc
->event_name
;
1144 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1145 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1146 case LTTNG_KERNEL_ABI_SYSCALL
:
1147 event_name
= event_notifier_param
->event
.name
;
1150 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1151 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1152 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1159 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1160 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1161 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1162 WARN_ON_ONCE(!event_notifier_priv
->parent
.desc
);
1163 if (!strncmp(event_notifier_priv
->parent
.desc
->event_name
, event_name
,
1164 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1165 && event_notifier_group
== event_notifier_priv
->group
1166 && token
== event_notifier_priv
->parent
.user_token
) {
1172 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1173 if (!event_notifier
) {
1177 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1178 if (!event_notifier_priv
) {
1180 goto cache_private_error
;
1182 event_notifier_priv
->pub
= event_notifier
;
1183 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1184 event_notifier
->priv
= event_notifier_priv
;
1185 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1186 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1188 event_notifier
->priv
->group
= event_notifier_group
;
1189 event_notifier
->priv
->parent
.user_token
= token
;
1190 event_notifier
->priv
->error_counter_index
= error_counter_index
;
1191 event_notifier
->priv
->num_captures
= 0;
1192 event_notifier
->priv
->parent
.instrumentation
= itype
;
1193 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1194 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1195 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1196 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1197 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1200 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1201 /* Event will be enabled by enabler sync. */
1202 event_notifier
->parent
.enabled
= 0;
1203 event_notifier
->priv
->parent
.registered
= 0;
1204 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1205 if (!event_notifier
->priv
->parent
.desc
) {
1207 goto register_error
;
1209 /* Populate lttng_event_notifier structure before event registration. */
1213 case LTTNG_KERNEL_ABI_KPROBE
:
1215 * Needs to be explicitly enabled after creation, since
1216 * we may want to apply filters.
1218 event_notifier
->parent
.enabled
= 0;
1219 event_notifier
->priv
->parent
.registered
= 1;
1221 * Populate lttng_event_notifier structure before event
1225 ret
= lttng_kprobes_register_event_notifier(
1226 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1227 event_notifier_param
->event
.u
.kprobe
.offset
,
1228 event_notifier_param
->event
.u
.kprobe
.addr
,
1232 goto register_error
;
1234 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1238 case LTTNG_KERNEL_ABI_SYSCALL
:
1240 * Needs to be explicitly enabled after creation, since
1241 * we may want to apply filters.
1243 event_notifier
->parent
.enabled
= 0;
1244 event_notifier
->priv
->parent
.registered
= 0;
1245 event_notifier
->priv
->parent
.desc
= event_desc
;
1246 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1247 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1249 goto register_error
;
1250 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1251 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1253 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1254 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1257 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1258 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1260 goto register_error
;
1261 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1262 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1264 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1265 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1269 if (!event_notifier
->priv
->parent
.desc
) {
1271 goto register_error
;
1275 case LTTNG_KERNEL_ABI_UPROBE
:
1277 * Needs to be explicitly enabled after creation, since
1278 * we may want to apply filters.
1280 event_notifier
->parent
.enabled
= 0;
1281 event_notifier
->priv
->parent
.registered
= 1;
1284 * Populate lttng_event_notifier structure before
1285 * event_notifier registration.
1289 ret
= lttng_uprobes_register_event_notifier(
1290 event_notifier_param
->event
.name
,
1291 event_notifier_param
->event
.u
.uprobe
.fd
,
1294 goto register_error
;
1295 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1299 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1300 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1301 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1305 goto register_error
;
1308 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1309 hlist_add_head(&event_notifier
->priv
->hlist
, head
);
1312 * Clear the error counter bucket. The sessiond keeps track of which
1313 * bucket is currently in use. We trust it. The session lock
1314 * synchronizes against concurrent creation of the error
1317 error_counter
= event_notifier_group
->error_counter
;
1318 if (error_counter
) {
1319 size_t dimension_index
[1];
1322 * Check that the index is within the boundary of the counter.
1324 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1325 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1326 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1328 goto register_error
;
1331 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1332 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1334 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1335 event_notifier
->priv
->error_counter_index
);
1336 goto register_error
;
1340 return event_notifier
;
1343 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1344 cache_private_error
:
1345 kmem_cache_free(event_notifier_cache
, event_notifier
);
1349 return ERR_PTR(ret
);
1352 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1353 const size_t *dim_indexes
, int32_t cpu
,
1354 int64_t *val
, bool *overflow
, bool *underflow
)
1356 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1357 cpu
, val
, overflow
, underflow
);
1360 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1361 const size_t *dim_indexes
, int64_t *val
,
1362 bool *overflow
, bool *underflow
)
1364 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1365 val
, overflow
, underflow
);
1368 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1369 const size_t *dim_indexes
)
1371 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1374 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer
*chan
,
1375 struct lttng_kernel_abi_event
*event_param
,
1376 const struct lttng_kernel_event_desc
*event_desc
,
1377 enum lttng_kernel_abi_instrumentation itype
)
1379 struct lttng_kernel_event_recorder
*event
;
1381 mutex_lock(&sessions_mutex
);
1382 event
= _lttng_kernel_event_recorder_create(chan
, event_param
, event_desc
, itype
);
1383 mutex_unlock(&sessions_mutex
);
1387 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(
1388 const struct lttng_kernel_event_desc
*event_desc
,
1389 uint64_t id
, uint64_t error_counter_index
,
1390 struct lttng_event_notifier_group
*event_notifier_group
,
1391 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1392 enum lttng_kernel_abi_instrumentation itype
)
1394 struct lttng_kernel_event_notifier
*event_notifier
;
1396 mutex_lock(&sessions_mutex
);
1397 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1398 error_counter_index
, event_notifier_group
,
1399 event_notifier_param
, itype
);
1400 mutex_unlock(&sessions_mutex
);
1401 return event_notifier
;
1404 /* Only used for tracepoints for now. */
1406 void register_event(struct lttng_kernel_event_recorder
*event_recorder
)
1408 const struct lttng_kernel_event_desc
*desc
;
1411 if (event_recorder
->priv
->parent
.registered
)
1414 desc
= event_recorder
->priv
->parent
.desc
;
1415 switch (event_recorder
->priv
->parent
.instrumentation
) {
1416 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1417 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1418 desc
->tp_class
->probe_callback
,
1422 case LTTNG_KERNEL_ABI_SYSCALL
:
1423 ret
= lttng_syscall_filter_enable_event(event_recorder
->chan
, event_recorder
);
1426 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1427 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1428 case LTTNG_KERNEL_ABI_KRETPROBE
:
1432 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1433 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1438 event_recorder
->priv
->parent
.registered
= 1;
1442 * Only used internally at session destruction.
1444 int _lttng_event_unregister(struct lttng_kernel_event_recorder
*event_recorder
)
1446 struct lttng_kernel_event_common_private
*event_priv
= &event_recorder
->priv
->parent
;
1447 const struct lttng_kernel_event_desc
*desc
;
1450 if (!event_priv
->registered
)
1453 desc
= event_priv
->desc
;
1454 switch (event_priv
->instrumentation
) {
1455 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1456 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1457 event_priv
->desc
->tp_class
->probe_callback
,
1461 case LTTNG_KERNEL_ABI_KPROBE
:
1462 lttng_kprobes_unregister_event(event_recorder
);
1466 case LTTNG_KERNEL_ABI_KRETPROBE
:
1467 lttng_kretprobes_unregister(event_recorder
);
1471 case LTTNG_KERNEL_ABI_SYSCALL
:
1472 ret
= lttng_syscall_filter_disable_event(event_recorder
->chan
, event_recorder
);
1475 case LTTNG_KERNEL_ABI_NOOP
:
1479 case LTTNG_KERNEL_ABI_UPROBE
:
1480 lttng_uprobes_unregister_event(event_recorder
);
1484 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1489 event_priv
->registered
= 0;
1493 /* Only used for tracepoints for now. */
1495 void register_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1497 const struct lttng_kernel_event_desc
*desc
;
1500 if (event_notifier
->priv
->parent
.registered
)
1503 desc
= event_notifier
->priv
->parent
.desc
;
1504 switch (event_notifier
->priv
->parent
.instrumentation
) {
1505 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1506 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1507 desc
->tp_class
->probe_callback
,
1511 case LTTNG_KERNEL_ABI_SYSCALL
:
1512 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1515 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1516 case LTTNG_KERNEL_ABI_UPROBE
:
1520 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1521 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1522 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1527 event_notifier
->priv
->parent
.registered
= 1;
1531 int _lttng_event_notifier_unregister(
1532 struct lttng_kernel_event_notifier
*event_notifier
)
1534 const struct lttng_kernel_event_desc
*desc
;
1537 if (!event_notifier
->priv
->parent
.registered
)
1540 desc
= event_notifier
->priv
->parent
.desc
;
1541 switch (event_notifier
->priv
->parent
.instrumentation
) {
1542 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1543 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->priv
->parent
.desc
->event_kname
,
1544 event_notifier
->priv
->parent
.desc
->tp_class
->probe_callback
,
1548 case LTTNG_KERNEL_ABI_KPROBE
:
1549 lttng_kprobes_unregister_event_notifier(event_notifier
);
1553 case LTTNG_KERNEL_ABI_UPROBE
:
1554 lttng_uprobes_unregister_event_notifier(event_notifier
);
1558 case LTTNG_KERNEL_ABI_SYSCALL
:
1559 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1562 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1563 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1564 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1569 event_notifier
->priv
->parent
.registered
= 0;
1574 * Only used internally at session destruction.
1577 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1579 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1580 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1582 lttng_free_event_filter_runtime(event
);
1583 /* Free event enabler refs */
1584 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1585 &event_priv
->enablers_ref_head
, node
)
1588 switch (event
->type
) {
1589 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1591 struct lttng_kernel_event_recorder
*event_recorder
=
1592 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1594 switch (event_priv
->instrumentation
) {
1595 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1596 lttng_event_desc_put(event_priv
->desc
);
1599 case LTTNG_KERNEL_ABI_KPROBE
:
1600 module_put(event_priv
->desc
->owner
);
1601 lttng_kprobes_destroy_event_private(event_recorder
);
1604 case LTTNG_KERNEL_ABI_KRETPROBE
:
1605 module_put(event_priv
->desc
->owner
);
1606 lttng_kretprobes_destroy_private(event_recorder
);
1609 case LTTNG_KERNEL_ABI_SYSCALL
:
1612 case LTTNG_KERNEL_ABI_UPROBE
:
1613 module_put(event_priv
->desc
->owner
);
1614 lttng_uprobes_destroy_event_private(event_recorder
);
1617 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1618 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1622 list_del(&event_recorder
->priv
->node
);
1623 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1624 kmem_cache_free(event_recorder_cache
, event_recorder
);
1627 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1629 struct lttng_kernel_event_notifier
*event_notifier
=
1630 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1632 switch (event_notifier
->priv
->parent
.instrumentation
) {
1633 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1634 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1637 case LTTNG_KERNEL_ABI_KPROBE
:
1638 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1639 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1642 case LTTNG_KERNEL_ABI_SYSCALL
:
1645 case LTTNG_KERNEL_ABI_UPROBE
:
1646 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1647 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1650 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1651 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1652 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1656 list_del(&event_notifier
->priv
->node
);
1657 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1658 kmem_cache_free(event_notifier_cache
, event_notifier
);
1666 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1667 enum tracker_type tracker_type
)
1669 switch (tracker_type
) {
1671 return &session
->pid_tracker
;
1673 return &session
->vpid_tracker
;
1675 return &session
->uid_tracker
;
1677 return &session
->vuid_tracker
;
1679 return &session
->gid_tracker
;
1681 return &session
->vgid_tracker
;
1688 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1689 enum tracker_type tracker_type
, int id
)
1691 struct lttng_kernel_id_tracker
*tracker
;
1694 tracker
= get_tracker(session
, tracker_type
);
1699 mutex_lock(&sessions_mutex
);
1701 /* track all ids: destroy tracker. */
1702 lttng_id_tracker_destroy(tracker
, true);
1705 ret
= lttng_id_tracker_add(tracker
, id
);
1707 mutex_unlock(&sessions_mutex
);
1711 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1712 enum tracker_type tracker_type
, int id
)
1714 struct lttng_kernel_id_tracker
*tracker
;
1717 tracker
= get_tracker(session
, tracker_type
);
1722 mutex_lock(&sessions_mutex
);
1724 /* untrack all ids: replace by empty tracker. */
1725 ret
= lttng_id_tracker_empty_set(tracker
);
1727 ret
= lttng_id_tracker_del(tracker
, id
);
1729 mutex_unlock(&sessions_mutex
);
1734 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1736 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1737 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1738 struct lttng_id_hash_node
*e
;
1741 mutex_lock(&sessions_mutex
);
1743 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1744 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1746 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1752 /* ID tracker disabled. */
1753 if (iter
>= *pos
&& iter
== 0) {
1754 return id_tracker_p
; /* empty tracker */
1762 /* Called with sessions_mutex held. */
1764 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1766 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1767 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1768 struct lttng_id_hash_node
*e
;
1773 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1774 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1776 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1777 if (iter
++ >= *ppos
)
1782 /* ID tracker disabled. */
1783 if (iter
>= *ppos
&& iter
== 0)
1784 return p
; /* empty tracker */
1793 void id_list_stop(struct seq_file
*m
, void *p
)
1795 mutex_unlock(&sessions_mutex
);
1799 int id_list_show(struct seq_file
*m
, void *p
)
1801 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1802 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1805 if (p
== id_tracker_p
) {
1806 /* Tracker disabled. */
1809 const struct lttng_id_hash_node
*e
= p
;
1811 id
= lttng_id_tracker_get_node_id(e
);
1813 switch (id_tracker
->priv
->tracker_type
) {
1815 seq_printf(m
, "process { pid = %d; };\n", id
);
1818 seq_printf(m
, "process { vpid = %d; };\n", id
);
1821 seq_printf(m
, "user { uid = %d; };\n", id
);
1824 seq_printf(m
, "user { vuid = %d; };\n", id
);
1827 seq_printf(m
, "group { gid = %d; };\n", id
);
1830 seq_printf(m
, "group { vgid = %d; };\n", id
);
1833 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1839 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1840 .start
= id_list_start
,
1841 .next
= id_list_next
,
1842 .stop
= id_list_stop
,
1843 .show
= id_list_show
,
1847 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1849 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1853 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1855 struct seq_file
*m
= file
->private_data
;
1856 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1859 WARN_ON_ONCE(!id_tracker
);
1860 ret
= seq_release(inode
, file
);
1862 fput(id_tracker
->priv
->session
->priv
->file
);
1866 const struct file_operations lttng_tracker_ids_list_fops
= {
1867 .owner
= THIS_MODULE
,
1868 .open
= lttng_tracker_ids_list_open
,
1870 .llseek
= seq_lseek
,
1871 .release
= lttng_tracker_ids_list_release
,
1874 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1875 enum tracker_type tracker_type
)
1877 struct file
*tracker_ids_list_file
;
1881 file_fd
= lttng_get_unused_fd();
1887 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1888 <tng_tracker_ids_list_fops
,
1890 if (IS_ERR(tracker_ids_list_file
)) {
1891 ret
= PTR_ERR(tracker_ids_list_file
);
1894 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1896 goto refcount_error
;
1898 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1901 m
= tracker_ids_list_file
->private_data
;
1903 m
->private = get_tracker(session
, tracker_type
);
1904 BUG_ON(!m
->private);
1905 fd_install(file_fd
, tracker_ids_list_file
);
1910 atomic_long_dec(&session
->priv
->file
->f_count
);
1912 fput(tracker_ids_list_file
);
1914 put_unused_fd(file_fd
);
1920 * Enabler management.
1923 int lttng_match_enabler_star_glob(const char *desc_name
,
1924 const char *pattern
)
1926 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1927 desc_name
, LTTNG_SIZE_MAX
))
1933 int lttng_match_enabler_name(const char *desc_name
,
1936 if (strcmp(desc_name
, name
))
1941 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1942 struct lttng_enabler
*enabler
)
1944 const char *desc_name
, *enabler_name
;
1945 bool compat
= false, entry
= false;
1947 enabler_name
= enabler
->event_param
.name
;
1948 switch (enabler
->event_param
.instrumentation
) {
1949 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1950 desc_name
= desc
->event_name
;
1951 switch (enabler
->format_type
) {
1952 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1953 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1954 case LTTNG_ENABLER_FORMAT_NAME
:
1955 return lttng_match_enabler_name(desc_name
, enabler_name
);
1961 case LTTNG_KERNEL_ABI_SYSCALL
:
1962 desc_name
= desc
->event_name
;
1963 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1964 desc_name
+= strlen("compat_");
1967 if (!strncmp(desc_name
, "syscall_exit_",
1968 strlen("syscall_exit_"))) {
1969 desc_name
+= strlen("syscall_exit_");
1970 } else if (!strncmp(desc_name
, "syscall_entry_",
1971 strlen("syscall_entry_"))) {
1972 desc_name
+= strlen("syscall_entry_");
1978 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1979 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1981 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1985 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1992 switch (enabler
->event_param
.u
.syscall
.abi
) {
1993 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1995 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1999 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2006 switch (enabler
->event_param
.u
.syscall
.match
) {
2007 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2008 switch (enabler
->format_type
) {
2009 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2010 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2011 case LTTNG_ENABLER_FORMAT_NAME
:
2012 return lttng_match_enabler_name(desc_name
, enabler_name
);
2017 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2018 return -EINVAL
; /* Not implemented. */
2031 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
2032 struct lttng_kernel_event_recorder
*event_recorder
)
2034 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
2037 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2039 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2040 && event_recorder
->chan
== event_enabler
->chan
)
2047 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2048 struct lttng_kernel_event_notifier
*event_notifier
)
2050 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2051 event_notifier_enabler
);
2053 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2055 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2056 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2057 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2064 struct lttng_enabler_ref
*lttng_enabler_ref(
2065 struct list_head
*enablers_ref_list
,
2066 struct lttng_enabler
*enabler
)
2068 struct lttng_enabler_ref
*enabler_ref
;
2070 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2071 if (enabler_ref
->ref
== enabler
)
2078 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2080 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2081 struct lttng_kernel_probe_desc
*probe_desc
;
2082 const struct lttng_kernel_event_desc
*desc
;
2084 struct list_head
*probe_list
;
2086 probe_list
= lttng_get_probe_list_head();
2088 * For each probe event, if we find that a probe event matches
2089 * our enabler, create an associated lttng_event if not
2092 list_for_each_entry(probe_desc
, probe_list
, head
) {
2093 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2095 struct hlist_head
*head
;
2096 struct lttng_kernel_event_recorder_private
*event_recorder_private
;
2097 struct lttng_kernel_event_recorder
*event_recorder
;
2099 desc
= probe_desc
->event_desc
[i
];
2100 if (!lttng_desc_match_enabler(desc
,
2101 lttng_event_enabler_as_enabler(event_enabler
)))
2105 * Check if already created.
2107 head
= utils_borrow_hash_table_bucket(
2108 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2110 lttng_hlist_for_each_entry(event_recorder_private
, head
, hlist
) {
2111 if (event_recorder_private
->parent
.desc
== desc
2112 && event_recorder_private
->pub
->chan
== event_enabler
->chan
)
2119 * We need to create an event for this
2122 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
->chan
,
2123 NULL
, desc
, LTTNG_KERNEL_ABI_TRACEPOINT
);
2124 if (!event_recorder
) {
2125 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2126 probe_desc
->event_desc
[i
]->event_name
);
2133 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2135 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2136 struct lttng_kernel_probe_desc
*probe_desc
;
2137 const struct lttng_kernel_event_desc
*desc
;
2139 struct list_head
*probe_list
;
2141 probe_list
= lttng_get_probe_list_head();
2143 * For each probe event, if we find that a probe event matches
2144 * our enabler, create an associated lttng_event_notifier if not
2147 list_for_each_entry(probe_desc
, probe_list
, head
) {
2148 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2150 struct hlist_head
*head
;
2151 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2152 struct lttng_kernel_event_notifier
*event_notifier
;
2154 desc
= probe_desc
->event_desc
[i
];
2155 if (!lttng_desc_match_enabler(desc
,
2156 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2160 * Check if already created.
2162 head
= utils_borrow_hash_table_bucket(
2163 event_notifier_group
->event_notifiers_ht
.table
,
2164 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2165 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
2166 if (event_notifier_priv
->parent
.desc
== desc
2167 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
2174 * We need to create a event_notifier for this event probe.
2176 event_notifier
= _lttng_event_notifier_create(desc
,
2177 event_notifier_enabler
->base
.user_token
,
2178 event_notifier_enabler
->error_counter_index
,
2179 event_notifier_group
, NULL
,
2180 LTTNG_KERNEL_ABI_TRACEPOINT
);
2181 if (IS_ERR(event_notifier
)) {
2182 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2183 probe_desc
->event_desc
[i
]->event_name
);
2190 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2194 ret
= lttng_syscalls_register_event(event_enabler
);
2199 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2203 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
);
2205 ret
= lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler
);
2210 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2211 * tracepoint probes.
2212 * Should be called with sessions mutex held.
2215 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2217 switch (event_enabler
->base
.event_param
.instrumentation
) {
2218 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2219 lttng_create_tracepoint_event_if_missing(event_enabler
);
2222 case LTTNG_KERNEL_ABI_SYSCALL
:
2223 lttng_create_syscall_event_if_missing(event_enabler
);
2233 * Create events associated with an event_enabler (if not already present),
2234 * and add backward reference from the event to the enabler.
2235 * Should be called with sessions mutex held.
2238 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2240 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2241 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2242 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2243 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2245 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2246 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2247 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2248 !strcmp(base_enabler
->event_param
.name
, "*")) {
2249 int enabled
= base_enabler
->enabled
;
2250 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2252 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2253 WRITE_ONCE(chan
->priv
->parent
.syscall_all_entry
, enabled
);
2255 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2256 WRITE_ONCE(chan
->priv
->parent
.syscall_all_exit
, enabled
);
2259 /* First ensure that probe events are created for this enabler. */
2260 lttng_create_event_if_missing(event_enabler
);
2262 /* For each event matching event_enabler in session event list. */
2263 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2264 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2265 struct lttng_enabler_ref
*enabler_ref
;
2267 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2269 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2270 lttng_event_enabler_as_enabler(event_enabler
));
2273 * If no backward ref, create it.
2274 * Add backward ref from event to event_enabler.
2276 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2279 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2280 list_add(&enabler_ref
->node
,
2281 &event_recorder_priv
->parent
.enablers_ref_head
);
2285 * Link filter bytecodes if not linked yet.
2287 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2289 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2290 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2296 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2297 * tracepoint probes.
2298 * Should be called with sessions mutex held.
2301 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2303 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2304 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2305 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2308 case LTTNG_KERNEL_ABI_SYSCALL
:
2309 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2319 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2322 int lttng_event_notifier_enabler_ref_event_notifiers(
2323 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2325 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2326 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2327 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2329 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2330 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2331 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2332 !strcmp(base_enabler
->event_param
.name
, "*")) {
2334 int enabled
= base_enabler
->enabled
;
2335 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2337 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2338 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2340 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2341 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2345 /* First ensure that probe event_notifiers are created for this enabler. */
2346 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2348 /* Link the created event_notifier with its associated enabler. */
2349 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2350 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2351 struct lttng_enabler_ref
*enabler_ref
;
2353 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2356 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2357 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2360 * If no backward ref, create it.
2361 * Add backward ref from event_notifier to enabler.
2363 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2367 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2368 event_notifier_enabler
);
2369 list_add(&enabler_ref
->node
,
2370 &event_notifier_priv
->parent
.enablers_ref_head
);
2374 * Link filter bytecodes if not linked yet.
2376 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2377 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2378 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2380 /* Link capture bytecodes if not linked yet. */
2381 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2382 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2383 &event_notifier_enabler
->capture_bytecode_head
);
2385 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2391 * Called at module load: connect the probe on all enablers matching
2393 * Called with sessions lock held.
2395 int lttng_fix_pending_events(void)
2397 struct lttng_kernel_session_private
*session_priv
;
2399 list_for_each_entry(session_priv
, &sessions
, list
)
2400 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2404 static bool lttng_event_notifier_group_has_active_event_notifiers(
2405 struct lttng_event_notifier_group
*event_notifier_group
)
2407 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2409 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2411 if (event_notifier_enabler
->base
.enabled
)
2417 bool lttng_event_notifier_active(void)
2419 struct lttng_event_notifier_group
*event_notifier_group
;
2421 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2422 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2428 int lttng_fix_pending_event_notifiers(void)
2430 struct lttng_event_notifier_group
*event_notifier_group
;
2432 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2433 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2437 struct lttng_event_enabler
*lttng_event_enabler_create(
2438 enum lttng_enabler_format_type format_type
,
2439 struct lttng_kernel_abi_event
*event_param
,
2440 struct lttng_kernel_channel_buffer
*chan
)
2442 struct lttng_event_enabler
*event_enabler
;
2444 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2447 event_enabler
->base
.format_type
= format_type
;
2448 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2449 memcpy(&event_enabler
->base
.event_param
, event_param
,
2450 sizeof(event_enabler
->base
.event_param
));
2451 event_enabler
->chan
= chan
;
2453 event_enabler
->base
.enabled
= 0;
2454 mutex_lock(&sessions_mutex
);
2455 list_add(&event_enabler
->node
, &event_enabler
->chan
->parent
.session
->priv
->enablers_head
);
2456 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2457 mutex_unlock(&sessions_mutex
);
2458 return event_enabler
;
2461 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2463 mutex_lock(&sessions_mutex
);
2464 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2465 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2466 mutex_unlock(&sessions_mutex
);
2470 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2472 mutex_lock(&sessions_mutex
);
2473 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2474 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2475 mutex_unlock(&sessions_mutex
);
2480 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2481 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2483 struct lttng_kernel_bytecode_node
*bytecode_node
;
2484 uint32_t bytecode_len
;
2487 ret
= get_user(bytecode_len
, &bytecode
->len
);
2490 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2494 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2495 sizeof(*bytecode
) + bytecode_len
);
2499 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2500 bytecode_node
->enabler
= enabler
;
2501 /* Enforce length based on allocated size */
2502 bytecode_node
->bc
.len
= bytecode_len
;
2503 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2508 lttng_kvfree(bytecode_node
);
2512 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2513 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2516 ret
= lttng_enabler_attach_filter_bytecode(
2517 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2521 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
.session
);
2528 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2529 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2532 switch (event
->priv
->instrumentation
) {
2533 case LTTNG_KERNEL_ABI_UPROBE
:
2534 return lttng_uprobes_event_add_callsite(event
, callsite
);
2541 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2543 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2545 /* Destroy filter bytecode */
2546 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2547 &enabler
->filter_bytecode_head
, node
) {
2548 lttng_kvfree(filter_node
);
2553 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2555 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2557 list_del(&event_enabler
->node
);
2558 kfree(event_enabler
);
2561 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2562 struct lttng_event_notifier_group
*event_notifier_group
,
2563 enum lttng_enabler_format_type format_type
,
2564 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2566 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2568 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2569 if (!event_notifier_enabler
)
2572 event_notifier_enabler
->base
.format_type
= format_type
;
2573 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2574 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2576 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2577 event_notifier_enabler
->num_captures
= 0;
2579 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2580 sizeof(event_notifier_enabler
->base
.event_param
));
2582 event_notifier_enabler
->base
.enabled
= 0;
2583 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2584 event_notifier_enabler
->group
= event_notifier_group
;
2586 mutex_lock(&sessions_mutex
);
2587 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2588 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2590 mutex_unlock(&sessions_mutex
);
2592 return event_notifier_enabler
;
2595 int lttng_event_notifier_enabler_enable(
2596 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2598 mutex_lock(&sessions_mutex
);
2599 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2600 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2601 mutex_unlock(&sessions_mutex
);
2605 int lttng_event_notifier_enabler_disable(
2606 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2608 mutex_lock(&sessions_mutex
);
2609 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2610 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2611 mutex_unlock(&sessions_mutex
);
2615 int lttng_event_notifier_enabler_attach_filter_bytecode(
2616 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2617 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2621 ret
= lttng_enabler_attach_filter_bytecode(
2622 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2627 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2634 int lttng_event_notifier_enabler_attach_capture_bytecode(
2635 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2636 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2638 struct lttng_kernel_bytecode_node
*bytecode_node
;
2639 struct lttng_enabler
*enabler
=
2640 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2641 uint32_t bytecode_len
;
2644 ret
= get_user(bytecode_len
, &bytecode
->len
);
2648 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2653 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2654 sizeof(*bytecode
) + bytecode_len
);
2658 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2659 bytecode_node
->enabler
= enabler
;
2661 /* Enforce length based on allocated size */
2662 bytecode_node
->bc
.len
= bytecode_len
;
2663 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2665 event_notifier_enabler
->num_captures
++;
2667 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2671 lttng_kvfree(bytecode_node
);
2677 void lttng_event_notifier_enabler_destroy(
2678 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2680 if (!event_notifier_enabler
) {
2684 list_del(&event_notifier_enabler
->node
);
2686 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2687 kfree(event_notifier_enabler
);
2691 * lttng_session_sync_event_enablers should be called just before starting a
2693 * Should be called with sessions mutex held.
2696 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2698 struct lttng_event_enabler
*event_enabler
;
2699 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2701 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2702 lttng_event_enabler_ref_events(event_enabler
);
2704 * For each event, if at least one of its enablers is enabled,
2705 * and its channel and session transient states are enabled, we
2706 * enable the event, else we disable it.
2708 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2709 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2710 struct lttng_enabler_ref
*enabler_ref
;
2711 struct lttng_kernel_bytecode_runtime
*runtime
;
2712 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2715 switch (event_recorder_priv
->parent
.instrumentation
) {
2716 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2717 case LTTNG_KERNEL_ABI_SYSCALL
:
2719 list_for_each_entry(enabler_ref
,
2720 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2721 if (enabler_ref
->ref
->enabled
) {
2729 /* Not handled with lazy sync. */
2733 * Enabled state is based on union of enablers, with
2734 * intesection of session and channel transient enable
2737 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2739 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2741 * Sync tracepoint registration with event enabled
2745 register_event(event_recorder
);
2747 _lttng_event_unregister(event_recorder
);
2750 /* Check if has enablers without bytecode enabled */
2751 list_for_each_entry(enabler_ref
,
2752 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2753 if (enabler_ref
->ref
->enabled
2754 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2755 has_enablers_without_filter_bytecode
= 1;
2759 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2760 has_enablers_without_filter_bytecode
;
2762 /* Enable filters */
2763 list_for_each_entry(runtime
,
2764 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2765 lttng_bytecode_sync_state(runtime
);
2768 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2769 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2774 * Apply enablers to session events, adding events to session if need
2775 * be. It is required after each modification applied to an active
2776 * session, and right before session "start".
2777 * "lazy" sync means we only sync if required.
2778 * Should be called with sessions mutex held.
2781 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2783 /* We can skip if session is not active */
2784 if (!session
->active
)
2786 lttng_session_sync_event_enablers(session
);
2790 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2792 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2793 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2795 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2796 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2799 * For each event_notifier, if at least one of its enablers is enabled,
2800 * we enable the event_notifier, else we disable it.
2802 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2803 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2804 struct lttng_enabler_ref
*enabler_ref
;
2805 struct lttng_kernel_bytecode_runtime
*runtime
;
2806 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2807 int nr_filters
= 0, nr_captures
= 0;
2809 switch (event_notifier_priv
->parent
.instrumentation
) {
2810 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2811 case LTTNG_KERNEL_ABI_SYSCALL
:
2812 /* Enable event_notifiers */
2813 list_for_each_entry(enabler_ref
,
2814 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2815 if (enabler_ref
->ref
->enabled
) {
2823 /* Not handled with sync. */
2827 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2829 * Sync tracepoint registration with event_notifier enabled
2833 if (!event_notifier_priv
->parent
.registered
)
2834 register_event_notifier(event_notifier
);
2836 if (event_notifier_priv
->parent
.registered
)
2837 _lttng_event_notifier_unregister(event_notifier
);
2840 /* Check if has enablers without bytecode enabled */
2841 list_for_each_entry(enabler_ref
,
2842 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2843 if (enabler_ref
->ref
->enabled
2844 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2845 has_enablers_without_filter_bytecode
= 1;
2849 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2850 has_enablers_without_filter_bytecode
;
2852 /* Enable filters */
2853 list_for_each_entry(runtime
,
2854 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2855 lttng_bytecode_sync_state(runtime
);
2858 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2859 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2861 /* Enable captures */
2862 list_for_each_entry(runtime
,
2863 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2864 lttng_bytecode_sync_state(runtime
);
2867 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2872 * Serialize at most one packet worth of metadata into a metadata
2874 * We grab the metadata cache mutex to get exclusive access to our metadata
2875 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2876 * allows us to do racy operations such as looking for remaining space left in
2877 * packet and write, since mutual exclusion protects us from concurrent writes.
2878 * Mutual exclusion on the metadata cache allow us to read the cache content
2879 * without racing against reallocation of the cache by updates.
2880 * Returns the number of bytes written in the channel, 0 if no data
2881 * was written and a negative value on error.
2883 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2884 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2886 struct lttng_kernel_ring_buffer_ctx ctx
;
2888 size_t len
, reserve_len
;
2891 * Ensure we support mutiple get_next / put sequences followed by
2892 * put_next. The metadata cache lock protects reading the metadata
2893 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2894 * "flush" operations on the buffer invoked by different processes.
2895 * Moreover, since the metadata cache memory can be reallocated, we
2896 * need to have exclusive access against updates even though we only
2899 mutex_lock(&stream
->metadata_cache
->lock
);
2900 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2901 if (stream
->metadata_in
!= stream
->metadata_out
)
2904 /* Metadata regenerated, change the version. */
2905 if (stream
->metadata_cache
->version
!= stream
->version
)
2906 stream
->version
= stream
->metadata_cache
->version
;
2908 len
= stream
->metadata_cache
->metadata_written
-
2909 stream
->metadata_in
;
2912 reserve_len
= min_t(size_t,
2913 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2915 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2916 sizeof(char), NULL
);
2918 * If reservation failed, return an error to the caller.
2920 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2922 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2923 stream
->coherent
= false;
2926 stream
->transport
->ops
.event_write(&ctx
,
2927 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2929 stream
->transport
->ops
.event_commit(&ctx
);
2930 stream
->metadata_in
+= reserve_len
;
2931 if (reserve_len
< len
)
2932 stream
->coherent
= false;
2934 stream
->coherent
= true;
2939 *coherent
= stream
->coherent
;
2940 mutex_unlock(&stream
->metadata_cache
->lock
);
2945 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2947 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2948 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2952 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2954 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2955 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2956 struct lttng_metadata_stream
*stream
;
2958 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2959 wake_up_interruptible(&stream
->read_wait
);
2960 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2965 * Write the metadata to the metadata cache.
2966 * Must be called with sessions_mutex held.
2967 * The metadata cache lock protects us from concurrent read access from
2968 * thread outputting metadata content to ring buffer.
2969 * The content of the printf is printed as a single atomic metadata
2972 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2973 const char *fmt
, ...)
2979 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2982 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2988 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2989 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2990 session
->priv
->metadata_cache
->cache_alloc
) {
2991 char *tmp_cache_realloc
;
2992 unsigned int tmp_cache_alloc_size
;
2994 tmp_cache_alloc_size
= max_t(unsigned int,
2995 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2996 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2997 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2998 if (!tmp_cache_realloc
)
3000 if (session
->priv
->metadata_cache
->data
) {
3001 memcpy(tmp_cache_realloc
,
3002 session
->priv
->metadata_cache
->data
,
3003 session
->priv
->metadata_cache
->cache_alloc
);
3004 vfree(session
->priv
->metadata_cache
->data
);
3007 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3008 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3010 memcpy(session
->priv
->metadata_cache
->data
+
3011 session
->priv
->metadata_cache
->metadata_written
,
3013 session
->priv
->metadata_cache
->metadata_written
+= len
;
3024 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3028 for (i
= 0; i
< nesting
; i
++) {
3031 ret
= lttng_metadata_printf(session
, " ");
3040 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3041 const struct lttng_kernel_event_field
*field
,
3044 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3048 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3049 const struct lttng_kernel_type_integer
*type
,
3050 enum lttng_kernel_string_encoding parent_encoding
,
3055 ret
= print_tabs(session
, nesting
);
3058 ret
= lttng_metadata_printf(session
,
3059 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3063 (parent_encoding
== lttng_kernel_string_encoding_none
)
3065 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3069 #if __BYTE_ORDER == __BIG_ENDIAN
3070 type
->reverse_byte_order
? " byte_order = le;" : ""
3072 type
->reverse_byte_order
? " byte_order = be;" : ""
3079 * Must be called with sessions_mutex held.
3082 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3083 const struct lttng_kernel_type_struct
*type
,
3086 const char *prev_field_name
= NULL
;
3088 uint32_t i
, nr_fields
;
3089 unsigned int alignment
;
3091 ret
= print_tabs(session
, nesting
);
3094 ret
= lttng_metadata_printf(session
,
3098 nr_fields
= type
->nr_fields
;
3099 for (i
= 0; i
< nr_fields
; i
++) {
3100 const struct lttng_kernel_event_field
*iter_field
;
3102 iter_field
= type
->fields
[i
];
3103 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3107 ret
= print_tabs(session
, nesting
);
3110 alignment
= type
->alignment
;
3112 ret
= lttng_metadata_printf(session
,
3116 ret
= lttng_metadata_printf(session
,
3123 * Must be called with sessions_mutex held.
3126 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3127 const struct lttng_kernel_event_field
*field
,
3132 ret
= _lttng_struct_type_statedump(session
,
3133 lttng_kernel_get_type_struct(field
->type
), nesting
);
3136 return lttng_field_name_statedump(session
, field
, nesting
);
3140 * Must be called with sessions_mutex held.
3143 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3144 const struct lttng_kernel_type_variant
*type
,
3146 const char *prev_field_name
)
3148 const char *tag_name
;
3150 uint32_t i
, nr_choices
;
3152 tag_name
= type
->tag_name
;
3154 tag_name
= prev_field_name
;
3158 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3160 if (type
->alignment
!= 0)
3162 ret
= print_tabs(session
, nesting
);
3165 ret
= lttng_metadata_printf(session
,
3166 "variant <_%s> {\n",
3170 nr_choices
= type
->nr_choices
;
3171 for (i
= 0; i
< nr_choices
; i
++) {
3172 const struct lttng_kernel_event_field
*iter_field
;
3174 iter_field
= type
->choices
[i
];
3175 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3179 ret
= print_tabs(session
, nesting
);
3182 ret
= lttng_metadata_printf(session
,
3188 * Must be called with sessions_mutex held.
3191 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3192 const struct lttng_kernel_event_field
*field
,
3194 const char *prev_field_name
)
3198 ret
= _lttng_variant_type_statedump(session
,
3199 lttng_kernel_get_type_variant(field
->type
), nesting
,
3203 return lttng_field_name_statedump(session
, field
, nesting
);
3207 * Must be called with sessions_mutex held.
3210 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3211 const struct lttng_kernel_event_field
*field
,
3215 const struct lttng_kernel_type_array
*array_type
;
3216 const struct lttng_kernel_type_common
*elem_type
;
3218 array_type
= lttng_kernel_get_type_array(field
->type
);
3219 WARN_ON_ONCE(!array_type
);
3221 if (array_type
->alignment
) {
3222 ret
= print_tabs(session
, nesting
);
3225 ret
= lttng_metadata_printf(session
,
3226 "struct { } align(%u) _%s_padding;\n",
3227 array_type
->alignment
* CHAR_BIT
,
3233 * Nested compound types: Only array of structures and variants are
3234 * currently supported.
3236 elem_type
= array_type
->elem_type
;
3237 switch (elem_type
->type
) {
3238 case lttng_kernel_type_integer
:
3239 case lttng_kernel_type_struct
:
3240 case lttng_kernel_type_variant
:
3241 ret
= _lttng_type_statedump(session
, elem_type
,
3242 array_type
->encoding
, nesting
);
3250 ret
= lttng_metadata_printf(session
,
3253 array_type
->length
);
3258 * Must be called with sessions_mutex held.
3261 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3262 const struct lttng_kernel_event_field
*field
,
3264 const char *prev_field_name
)
3267 const char *length_name
;
3268 const struct lttng_kernel_type_sequence
*sequence_type
;
3269 const struct lttng_kernel_type_common
*elem_type
;
3271 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3272 WARN_ON_ONCE(!sequence_type
);
3274 length_name
= sequence_type
->length_name
;
3276 length_name
= prev_field_name
;
3280 if (sequence_type
->alignment
) {
3281 ret
= print_tabs(session
, nesting
);
3284 ret
= lttng_metadata_printf(session
,
3285 "struct { } align(%u) _%s_padding;\n",
3286 sequence_type
->alignment
* CHAR_BIT
,
3293 * Nested compound types: Only array of structures and variants are
3294 * currently supported.
3296 elem_type
= sequence_type
->elem_type
;
3297 switch (elem_type
->type
) {
3298 case lttng_kernel_type_integer
:
3299 case lttng_kernel_type_struct
:
3300 case lttng_kernel_type_variant
:
3301 ret
= _lttng_type_statedump(session
, elem_type
,
3302 sequence_type
->encoding
, nesting
);
3310 ret
= lttng_metadata_printf(session
,
3318 * Must be called with sessions_mutex held.
3321 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3322 const struct lttng_kernel_type_enum
*type
,
3325 const struct lttng_kernel_enum_desc
*enum_desc
;
3326 const struct lttng_kernel_type_common
*container_type
;
3328 unsigned int i
, nr_entries
;
3330 container_type
= type
->container_type
;
3331 if (container_type
->type
!= lttng_kernel_type_integer
) {
3335 enum_desc
= type
->desc
;
3336 nr_entries
= enum_desc
->nr_entries
;
3338 ret
= print_tabs(session
, nesting
);
3341 ret
= lttng_metadata_printf(session
, "enum : ");
3344 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3345 lttng_kernel_string_encoding_none
, 0);
3348 ret
= lttng_metadata_printf(session
, " {\n");
3351 /* Dump all entries */
3352 for (i
= 0; i
< nr_entries
; i
++) {
3353 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3356 ret
= print_tabs(session
, nesting
+ 1);
3359 ret
= lttng_metadata_printf(session
,
3363 len
= strlen(entry
->string
);
3364 /* Escape the character '"' */
3365 for (j
= 0; j
< len
; j
++) {
3366 char c
= entry
->string
[j
];
3370 ret
= lttng_metadata_printf(session
,
3374 ret
= lttng_metadata_printf(session
,
3378 ret
= lttng_metadata_printf(session
,
3385 ret
= lttng_metadata_printf(session
, "\"");
3389 if (entry
->options
.is_auto
) {
3390 ret
= lttng_metadata_printf(session
, ",\n");
3394 ret
= lttng_metadata_printf(session
,
3398 if (entry
->start
.signedness
)
3399 ret
= lttng_metadata_printf(session
,
3400 "%lld", (long long) entry
->start
.value
);
3402 ret
= lttng_metadata_printf(session
,
3403 "%llu", entry
->start
.value
);
3406 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3408 == entry
->end
.value
) {
3409 ret
= lttng_metadata_printf(session
,
3412 if (entry
->end
.signedness
) {
3413 ret
= lttng_metadata_printf(session
,
3415 (long long) entry
->end
.value
);
3417 ret
= lttng_metadata_printf(session
,
3426 ret
= print_tabs(session
, nesting
);
3429 ret
= lttng_metadata_printf(session
, "}");
3435 * Must be called with sessions_mutex held.
3438 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3439 const struct lttng_kernel_event_field
*field
,
3443 const struct lttng_kernel_type_enum
*enum_type
;
3445 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3446 WARN_ON_ONCE(!enum_type
);
3447 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3450 return lttng_field_name_statedump(session
, field
, nesting
);
3454 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3455 const struct lttng_kernel_event_field
*field
,
3460 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3461 lttng_kernel_string_encoding_none
, nesting
);
3464 return lttng_field_name_statedump(session
, field
, nesting
);
3468 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3469 const struct lttng_kernel_type_string
*type
,
3474 /* Default encoding is UTF8 */
3475 ret
= print_tabs(session
, nesting
);
3478 ret
= lttng_metadata_printf(session
,
3480 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3481 " { encoding = ASCII; }" : "");
3486 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3487 const struct lttng_kernel_event_field
*field
,
3490 const struct lttng_kernel_type_string
*string_type
;
3493 string_type
= lttng_kernel_get_type_string(field
->type
);
3494 WARN_ON_ONCE(!string_type
);
3495 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3498 return lttng_field_name_statedump(session
, field
, nesting
);
3502 * Must be called with sessions_mutex held.
3505 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3506 const struct lttng_kernel_type_common
*type
,
3507 enum lttng_kernel_string_encoding parent_encoding
,
3512 switch (type
->type
) {
3513 case lttng_kernel_type_integer
:
3514 ret
= _lttng_integer_type_statedump(session
,
3515 lttng_kernel_get_type_integer(type
),
3516 parent_encoding
, nesting
);
3518 case lttng_kernel_type_enum
:
3519 ret
= _lttng_enum_type_statedump(session
,
3520 lttng_kernel_get_type_enum(type
),
3523 case lttng_kernel_type_string
:
3524 ret
= _lttng_string_type_statedump(session
,
3525 lttng_kernel_get_type_string(type
),
3528 case lttng_kernel_type_struct
:
3529 ret
= _lttng_struct_type_statedump(session
,
3530 lttng_kernel_get_type_struct(type
),
3533 case lttng_kernel_type_variant
:
3534 ret
= _lttng_variant_type_statedump(session
,
3535 lttng_kernel_get_type_variant(type
),
3539 /* Nested arrays and sequences are not supported yet. */
3540 case lttng_kernel_type_array
:
3541 case lttng_kernel_type_sequence
:
3550 * Must be called with sessions_mutex held.
3553 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3554 const struct lttng_kernel_event_field
*field
,
3556 const char **prev_field_name_p
)
3558 const char *prev_field_name
= NULL
;
3561 if (prev_field_name_p
)
3562 prev_field_name
= *prev_field_name_p
;
3563 switch (field
->type
->type
) {
3564 case lttng_kernel_type_integer
:
3565 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3567 case lttng_kernel_type_enum
:
3568 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3570 case lttng_kernel_type_string
:
3571 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3573 case lttng_kernel_type_struct
:
3574 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3576 case lttng_kernel_type_array
:
3577 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3579 case lttng_kernel_type_sequence
:
3580 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3582 case lttng_kernel_type_variant
:
3583 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3590 if (prev_field_name_p
)
3591 *prev_field_name_p
= field
->name
;
3596 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3597 struct lttng_kernel_ctx
*ctx
)
3599 const char *prev_field_name
= NULL
;
3605 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3606 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3608 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3616 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3617 struct lttng_kernel_event_recorder
*event_recorder
)
3619 const char *prev_field_name
= NULL
;
3620 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3624 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3625 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3627 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3635 * Must be called with sessions_mutex held.
3636 * The entire event metadata is printed as a single atomic metadata
3640 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3641 struct lttng_kernel_channel_buffer
*chan
,
3642 struct lttng_kernel_event_recorder
*event_recorder
)
3646 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3648 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3651 lttng_metadata_begin(session
);
3653 ret
= lttng_metadata_printf(session
,
3657 " stream_id = %u;\n",
3658 event_recorder
->priv
->parent
.desc
->event_name
,
3659 event_recorder
->priv
->id
,
3660 event_recorder
->chan
->priv
->id
);
3664 ret
= lttng_metadata_printf(session
,
3665 " fields := struct {\n"
3670 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3675 * LTTng space reservation can only reserve multiples of the
3678 ret
= lttng_metadata_printf(session
,
3684 event_recorder
->priv
->metadata_dumped
= 1;
3686 lttng_metadata_end(session
);
3692 * Must be called with sessions_mutex held.
3693 * The entire channel metadata is printed as a single atomic metadata
3697 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3698 struct lttng_kernel_channel_buffer
*chan
)
3702 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3705 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3708 lttng_metadata_begin(session
);
3710 WARN_ON_ONCE(!chan
->priv
->header_type
);
3711 ret
= lttng_metadata_printf(session
,
3714 " event.header := %s;\n"
3715 " packet.context := struct packet_context;\n",
3717 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3718 "struct event_header_large");
3722 if (chan
->priv
->ctx
) {
3723 ret
= lttng_metadata_printf(session
,
3724 " event.context := struct {\n");
3728 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3731 if (chan
->priv
->ctx
) {
3732 ret
= lttng_metadata_printf(session
,
3738 ret
= lttng_metadata_printf(session
,
3741 chan
->priv
->metadata_dumped
= 1;
3743 lttng_metadata_end(session
);
3748 * Must be called with sessions_mutex held.
3751 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3753 return lttng_metadata_printf(session
,
3754 "struct packet_context {\n"
3755 " uint64_clock_monotonic_t timestamp_begin;\n"
3756 " uint64_clock_monotonic_t timestamp_end;\n"
3757 " uint64_t content_size;\n"
3758 " uint64_t packet_size;\n"
3759 " uint64_t packet_seq_num;\n"
3760 " unsigned long events_discarded;\n"
3761 " uint32_t cpu_id;\n"
3768 * id: range: 0 - 30.
3769 * id 31 is reserved to indicate an extended header.
3772 * id: range: 0 - 65534.
3773 * id 65535 is reserved to indicate an extended header.
3775 * Must be called with sessions_mutex held.
3778 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3780 return lttng_metadata_printf(session
,
3781 "struct event_header_compact {\n"
3782 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3785 " uint27_clock_monotonic_t timestamp;\n"
3789 " uint64_clock_monotonic_t timestamp;\n"
3794 "struct event_header_large {\n"
3795 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3798 " uint32_clock_monotonic_t timestamp;\n"
3802 " uint64_clock_monotonic_t timestamp;\n"
3806 lttng_alignof(uint32_t) * CHAR_BIT
,
3807 lttng_alignof(uint16_t) * CHAR_BIT
3812 * Approximation of NTP time of day to clock monotonic correlation,
3813 * taken at start of trace.
3814 * Yes, this is only an approximation. Yes, we can (and will) do better
3815 * in future versions.
3816 * This function may return a negative offset. It may happen if the
3817 * system sets the REALTIME clock to 0 after boot.
3819 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3823 int64_t measure_clock_offset(void)
3825 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3826 uint64_t tcf
= trace_clock_freq();
3828 unsigned long flags
;
3829 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3830 struct timespec64 rts
= { 0, 0 };
3832 struct timespec rts
= { 0, 0 };
3835 /* Disable interrupts to increase correlation precision. */
3836 local_irq_save(flags
);
3837 monotonic
[0] = trace_clock_read64();
3838 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3839 ktime_get_real_ts64(&rts
);
3841 getnstimeofday(&rts
);
3843 monotonic
[1] = trace_clock_read64();
3844 local_irq_restore(flags
);
3846 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3847 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3848 if (tcf
== NSEC_PER_SEC
) {
3849 realtime
+= rts
.tv_nsec
;
3851 uint64_t n
= rts
.tv_nsec
* tcf
;
3853 do_div(n
, NSEC_PER_SEC
);
3856 offset
= (int64_t) realtime
- monotonic_avg
;
3861 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3869 while (cur
!= '\0') {
3872 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3876 ret
= lttng_metadata_printf(session
, "%c", '\\');
3879 /* We still print the current char */
3882 ret
= lttng_metadata_printf(session
, "%c", cur
);
3896 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3897 const char *field_value
)
3901 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3905 ret
= print_escaped_ctf_string(session
, field_value
);
3909 ret
= lttng_metadata_printf(session
, "\";\n");
3916 * Output metadata into this session's metadata buffers.
3917 * Must be called with sessions_mutex held.
3920 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3922 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3923 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3924 const char *product_uuid
;
3925 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3926 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3929 if (!LTTNG_READ_ONCE(session
->active
))
3932 lttng_metadata_begin(session
);
3934 if (session
->priv
->metadata_dumped
)
3937 snprintf(uuid_s
, sizeof(uuid_s
),
3938 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3939 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3940 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3941 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3942 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3944 ret
= lttng_metadata_printf(session
,
3945 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3946 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3947 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3948 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3949 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3950 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3951 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3957 " byte_order = %s;\n"
3958 " packet.header := struct {\n"
3959 " uint32_t magic;\n"
3960 " uint8_t uuid[16];\n"
3961 " uint32_t stream_id;\n"
3962 " uint64_t stream_instance_id;\n"
3965 lttng_alignof(uint8_t) * CHAR_BIT
,
3966 lttng_alignof(uint16_t) * CHAR_BIT
,
3967 lttng_alignof(uint32_t) * CHAR_BIT
,
3968 lttng_alignof(uint64_t) * CHAR_BIT
,
3969 sizeof(unsigned long) * CHAR_BIT
,
3970 lttng_alignof(unsigned long) * CHAR_BIT
,
3974 #if __BYTE_ORDER == __BIG_ENDIAN
3983 ret
= lttng_metadata_printf(session
,
3985 " hostname = \"%s\";\n"
3986 " domain = \"kernel\";\n"
3987 " sysname = \"%s\";\n"
3988 " kernel_release = \"%s\";\n"
3989 " kernel_version = \"%s\";\n"
3990 " tracer_name = \"lttng-modules\";\n"
3991 " tracer_major = %d;\n"
3992 " tracer_minor = %d;\n"
3993 " tracer_patchlevel = %d;\n"
3994 " trace_buffering_scheme = \"global\";\n",
3995 current
->nsproxy
->uts_ns
->name
.nodename
,
3999 LTTNG_MODULES_MAJOR_VERSION
,
4000 LTTNG_MODULES_MINOR_VERSION
,
4001 LTTNG_MODULES_PATCHLEVEL_VERSION
4006 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4009 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4010 session
->priv
->creation_time
);
4014 /* Add the product UUID to the 'env' section */
4015 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4017 ret
= lttng_metadata_printf(session
,
4018 " product_uuid = \"%s\";\n",
4025 /* Close the 'env' section */
4026 ret
= lttng_metadata_printf(session
, "};\n\n");
4030 ret
= lttng_metadata_printf(session
,
4032 " name = \"%s\";\n",
4038 if (!trace_clock_uuid(clock_uuid_s
)) {
4039 ret
= lttng_metadata_printf(session
,
4040 " uuid = \"%s\";\n",
4047 ret
= lttng_metadata_printf(session
,
4048 " description = \"%s\";\n"
4049 " freq = %llu; /* Frequency, in Hz */\n"
4050 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4053 trace_clock_description(),
4054 (unsigned long long) trace_clock_freq(),
4055 (long long) measure_clock_offset()
4060 ret
= lttng_metadata_printf(session
,
4061 "typealias integer {\n"
4062 " size = 27; align = 1; signed = false;\n"
4063 " map = clock.%s.value;\n"
4064 "} := uint27_clock_monotonic_t;\n"
4066 "typealias integer {\n"
4067 " size = 32; align = %u; signed = false;\n"
4068 " map = clock.%s.value;\n"
4069 "} := uint32_clock_monotonic_t;\n"
4071 "typealias integer {\n"
4072 " size = 64; align = %u; signed = false;\n"
4073 " map = clock.%s.value;\n"
4074 "} := uint64_clock_monotonic_t;\n\n",
4076 lttng_alignof(uint32_t) * CHAR_BIT
,
4078 lttng_alignof(uint64_t) * CHAR_BIT
,
4084 ret
= _lttng_stream_packet_context_declare(session
);
4088 ret
= _lttng_event_header_declare(session
);
4093 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4094 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4099 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4100 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4101 event_recorder_priv
->pub
);
4105 session
->priv
->metadata_dumped
= 1;
4107 lttng_metadata_end(session
);
4112 * lttng_transport_register - LTT transport registration
4113 * @transport: transport structure
4115 * Registers a transport which can be used as output to extract the data out of
4116 * LTTng. The module calling this registration function must ensure that no
4117 * trap-inducing code will be executed by the transport functions. E.g.
4118 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4119 * is made visible to the transport function. This registration acts as a
4120 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4121 * after its registration must it synchronize the TLBs.
4123 void lttng_transport_register(struct lttng_transport
*transport
)
4126 * Make sure no page fault can be triggered by the module about to be
4127 * registered. We deal with this here so we don't have to call
4128 * vmalloc_sync_mappings() in each module's init.
4130 wrapper_vmalloc_sync_mappings();
4132 mutex_lock(&sessions_mutex
);
4133 list_add_tail(&transport
->node
, <tng_transport_list
);
4134 mutex_unlock(&sessions_mutex
);
4136 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4139 * lttng_transport_unregister - LTT transport unregistration
4140 * @transport: transport structure
4142 void lttng_transport_unregister(struct lttng_transport
*transport
)
4144 mutex_lock(&sessions_mutex
);
4145 list_del(&transport
->node
);
4146 mutex_unlock(&sessions_mutex
);
4148 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4150 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4153 * Make sure no page fault can be triggered by the module about to be
4154 * registered. We deal with this here so we don't have to call
4155 * vmalloc_sync_mappings() in each module's init.
4157 wrapper_vmalloc_sync_mappings();
4159 mutex_lock(&sessions_mutex
);
4160 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4161 mutex_unlock(&sessions_mutex
);
4163 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4165 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4167 mutex_lock(&sessions_mutex
);
4168 list_del(&transport
->node
);
4169 mutex_unlock(&sessions_mutex
);
4171 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4173 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4175 enum cpuhp_state lttng_hp_prepare
;
4176 enum cpuhp_state lttng_hp_online
;
4178 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4180 struct lttng_cpuhp_node
*lttng_node
;
4182 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4183 switch (lttng_node
->component
) {
4184 case LTTNG_RING_BUFFER_FRONTEND
:
4186 case LTTNG_RING_BUFFER_BACKEND
:
4187 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4188 case LTTNG_RING_BUFFER_ITER
:
4190 case LTTNG_CONTEXT_PERF_COUNTERS
:
4197 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4199 struct lttng_cpuhp_node
*lttng_node
;
4201 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4202 switch (lttng_node
->component
) {
4203 case LTTNG_RING_BUFFER_FRONTEND
:
4204 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4205 case LTTNG_RING_BUFFER_BACKEND
:
4207 case LTTNG_RING_BUFFER_ITER
:
4209 case LTTNG_CONTEXT_PERF_COUNTERS
:
4210 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4216 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4218 struct lttng_cpuhp_node
*lttng_node
;
4220 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4221 switch (lttng_node
->component
) {
4222 case LTTNG_RING_BUFFER_FRONTEND
:
4223 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4224 case LTTNG_RING_BUFFER_BACKEND
:
4226 case LTTNG_RING_BUFFER_ITER
:
4227 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4228 case LTTNG_CONTEXT_PERF_COUNTERS
:
4229 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4235 static int lttng_hotplug_offline(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
:
4242 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4243 case LTTNG_RING_BUFFER_BACKEND
:
4245 case LTTNG_RING_BUFFER_ITER
:
4247 case LTTNG_CONTEXT_PERF_COUNTERS
:
4254 static int __init
lttng_init_cpu_hotplug(void)
4258 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4259 lttng_hotplug_prepare
,
4260 lttng_hotplug_dead
);
4264 lttng_hp_prepare
= ret
;
4265 lttng_rb_set_hp_prepare(ret
);
4267 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4268 lttng_hotplug_online
,
4269 lttng_hotplug_offline
);
4271 cpuhp_remove_multi_state(lttng_hp_prepare
);
4272 lttng_hp_prepare
= 0;
4275 lttng_hp_online
= ret
;
4276 lttng_rb_set_hp_online(ret
);
4281 static void __exit
lttng_exit_cpu_hotplug(void)
4283 lttng_rb_set_hp_online(0);
4284 cpuhp_remove_multi_state(lttng_hp_online
);
4285 lttng_rb_set_hp_prepare(0);
4286 cpuhp_remove_multi_state(lttng_hp_prepare
);
4289 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4290 static int lttng_init_cpu_hotplug(void)
4294 static void lttng_exit_cpu_hotplug(void)
4297 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4299 static int __init
lttng_events_init(void)
4303 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4306 ret
= wrapper_get_pfnblock_flags_mask_init();
4309 ret
= wrapper_get_pageblock_flags_mask_init();
4312 ret
= lttng_probes_init();
4315 ret
= lttng_context_init();
4318 ret
= lttng_tracepoint_init();
4321 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4322 if (!event_recorder_cache
) {
4324 goto error_kmem_event_recorder
;
4326 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4327 if (!event_recorder_private_cache
) {
4329 goto error_kmem_event_recorder_private
;
4331 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4332 if (!event_notifier_cache
) {
4334 goto error_kmem_event_notifier
;
4336 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4337 if (!event_notifier_private_cache
) {
4339 goto error_kmem_event_notifier_private
;
4341 ret
= lttng_abi_init();
4344 ret
= lttng_logger_init();
4347 ret
= lttng_init_cpu_hotplug();
4350 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4351 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4352 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4353 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4354 LTTNG_MODULES_EXTRAVERSION
,
4356 #ifdef LTTNG_EXTRA_VERSION_GIT
4357 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4361 #ifdef LTTNG_EXTRA_VERSION_NAME
4362 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4366 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4367 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4368 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4372 lttng_logger_exit();
4376 kmem_cache_destroy(event_notifier_private_cache
);
4377 error_kmem_event_notifier_private
:
4378 kmem_cache_destroy(event_notifier_cache
);
4379 error_kmem_event_notifier
:
4380 kmem_cache_destroy(event_recorder_private_cache
);
4381 error_kmem_event_recorder_private
:
4382 kmem_cache_destroy(event_recorder_cache
);
4383 error_kmem_event_recorder
:
4384 lttng_tracepoint_exit();
4386 lttng_context_exit();
4387 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4388 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4389 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4390 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4391 LTTNG_MODULES_EXTRAVERSION
,
4393 #ifdef LTTNG_EXTRA_VERSION_GIT
4394 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4398 #ifdef LTTNG_EXTRA_VERSION_NAME
4399 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4406 module_init(lttng_events_init
);
4408 static void __exit
lttng_events_exit(void)
4410 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4412 lttng_exit_cpu_hotplug();
4413 lttng_logger_exit();
4415 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4416 lttng_session_destroy(session_priv
->pub
);
4417 kmem_cache_destroy(event_recorder_cache
);
4418 kmem_cache_destroy(event_recorder_private_cache
);
4419 kmem_cache_destroy(event_notifier_cache
);
4420 kmem_cache_destroy(event_notifier_private_cache
);
4421 lttng_tracepoint_exit();
4422 lttng_context_exit();
4423 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4424 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4425 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4426 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4427 LTTNG_MODULES_EXTRAVERSION
,
4429 #ifdef LTTNG_EXTRA_VERSION_GIT
4430 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4434 #ifdef LTTNG_EXTRA_VERSION_NAME
4435 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4441 module_exit(lttng_events_exit
);
4443 #include <generated/patches.h>
4444 #ifdef LTTNG_EXTRA_VERSION_GIT
4445 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4447 #ifdef LTTNG_EXTRA_VERSION_NAME
4448 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4450 MODULE_LICENSE("GPL and additional rights");
4451 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4452 MODULE_DESCRIPTION("LTTng tracer");
4453 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4454 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4455 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4456 LTTNG_MODULES_EXTRAVERSION
);