2 * SPDX-License-Identifier: LGPL-2.1-only
4 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * Holds LTTng per-session event registry.
24 #include <lttng/ust-endian.h>
26 #include <urcu/arch.h>
27 #include <urcu/compiler.h>
28 #include <urcu/hlist.h>
29 #include <urcu/list.h>
30 #include <urcu/uatomic.h>
32 #include <lttng/tracepoint.h>
33 #include <lttng/ust-events.h>
35 #include <usterr-signal-safe.h>
36 #include <ust-helper.h>
37 #include <lttng/ust-ctl.h>
40 #include <ust-dynamic-type.h>
41 #include <ust-context-provider.h>
44 #include "lttng-ust-uuid.h"
46 #include "tracepoint-internal.h"
47 #include "string-utils.h"
48 #include "lttng-bytecode.h"
49 #include "lttng-tracer.h"
50 #include "lttng-tracer-core.h"
51 #include "lttng-ust-statedump.h"
52 #include "context-internal.h"
53 #include "ust-events-internal.h"
55 #include "../libringbuffer/shm.h"
56 #include "../libcounter/counter.h"
58 #include <lttng/ust-abi.h>
61 * All operations within this file are called by the communication
62 * thread, under ust_lock protection.
65 static CDS_LIST_HEAD(sessions
);
66 static CDS_LIST_HEAD(event_notifier_groups
);
68 struct cds_list_head
*lttng_get_sessions(void)
73 static void _lttng_event_destroy(struct lttng_event
*event
);
74 static void _lttng_event_notifier_destroy(
75 struct lttng_event_notifier
*event_notifier
);
76 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
79 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
81 void lttng_session_sync_event_enablers(struct lttng_session
*session
);
83 void lttng_event_notifier_group_sync_enablers(
84 struct lttng_event_notifier_group
*event_notifier_group
);
86 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
89 * Called with ust lock held.
91 int lttng_session_active(void)
93 struct lttng_ust_session_private
*iter
;
95 cds_list_for_each_entry(iter
, &sessions
, node
) {
96 if (iter
->pub
->active
)
103 int lttng_loglevel_match(int loglevel
,
104 unsigned int has_loglevel
,
105 enum lttng_ust_loglevel_type req_type
,
109 loglevel
= TRACE_DEFAULT
;
111 case LTTNG_UST_LOGLEVEL_RANGE
:
112 if (loglevel
<= req_loglevel
113 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
117 case LTTNG_UST_LOGLEVEL_SINGLE
:
118 if (loglevel
== req_loglevel
119 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
123 case LTTNG_UST_LOGLEVEL_ALL
:
125 if (loglevel
<= TRACE_DEBUG
)
132 struct lttng_session
*lttng_session_create(void)
134 struct lttng_session
*session
;
135 struct lttng_ust_session_private
*session_priv
;
138 session
= zmalloc(sizeof(struct lttng_session
));
141 session
->struct_size
= sizeof(struct lttng_session
);
142 session_priv
= zmalloc(sizeof(struct lttng_ust_session_private
));
147 session
->priv
= session_priv
;
148 session_priv
->pub
= session
;
149 if (lttng_context_init_all(&session
->priv
->ctx
)) {
154 CDS_INIT_LIST_HEAD(&session
->priv
->chan_head
);
155 CDS_INIT_LIST_HEAD(&session
->priv
->events_head
);
156 CDS_INIT_LIST_HEAD(&session
->priv
->enums_head
);
157 CDS_INIT_LIST_HEAD(&session
->priv
->enablers_head
);
158 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
159 CDS_INIT_HLIST_HEAD(&session
->priv
->events_ht
.table
[i
]);
160 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
161 CDS_INIT_HLIST_HEAD(&session
->priv
->enums_ht
.table
[i
]);
162 cds_list_add(&session
->priv
->node
, &sessions
);
166 struct lttng_counter
*lttng_ust_counter_create(
167 const char *counter_transport_name
,
168 size_t number_dimensions
, const struct lttng_counter_dimension
*dimensions
)
170 struct lttng_counter_transport
*counter_transport
= NULL
;
171 struct lttng_counter
*counter
= NULL
;
173 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
174 if (!counter_transport
)
176 counter
= zmalloc(sizeof(struct lttng_counter
));
180 counter
->ops
= &counter_transport
->ops
;
181 counter
->transport
= counter_transport
;
183 counter
->counter
= counter
->ops
->counter_create(
184 number_dimensions
, dimensions
, 0,
186 if (!counter
->counter
) {
200 void lttng_ust_counter_destroy(struct lttng_counter
*counter
)
202 counter
->ops
->counter_destroy(counter
->counter
);
206 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
208 struct lttng_event_notifier_group
*event_notifier_group
;
211 event_notifier_group
= zmalloc(sizeof(struct lttng_event_notifier_group
));
212 if (!event_notifier_group
)
215 /* Add all contexts. */
216 if (lttng_context_init_all(&event_notifier_group
->ctx
)) {
217 free(event_notifier_group
);
221 CDS_INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
222 CDS_INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
223 for (i
= 0; i
< LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
; i
++)
224 CDS_INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
226 cds_list_add(&event_notifier_group
->node
, &event_notifier_groups
);
228 return event_notifier_group
;
232 * Only used internally at session destruction.
235 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
237 struct channel
*chan
;
238 struct lttng_ust_shm_handle
*handle
;
240 cds_list_del(<tng_chan
->node
);
241 lttng_destroy_context(lttng_chan
->ctx
);
242 chan
= lttng_chan
->chan
;
243 handle
= lttng_chan
->handle
;
245 * note: lttng_chan is private data contained within handle. It
246 * will be freed along with the handle.
248 channel_destroy(chan
, handle
, 0);
252 void register_event(struct lttng_event
*event
)
255 const struct lttng_event_desc
*desc
;
257 assert(event
->priv
->registered
== 0);
258 desc
= event
->priv
->desc
;
259 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
260 desc
->probe_callback
,
261 event
, desc
->signature
);
264 event
->priv
->registered
= 1;
268 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
271 const struct lttng_event_desc
*desc
;
273 assert(event_notifier
->registered
== 0);
274 desc
= event_notifier
->desc
;
275 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
276 desc
->u
.ext
.event_notifier_callback
, event_notifier
, desc
->signature
);
279 event_notifier
->registered
= 1;
283 void unregister_event(struct lttng_event
*event
)
286 const struct lttng_event_desc
*desc
;
288 assert(event
->priv
->registered
== 1);
289 desc
= event
->priv
->desc
;
290 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
291 desc
->probe_callback
,
295 event
->priv
->registered
= 0;
299 void unregister_event_notifier(struct lttng_event_notifier
*event_notifier
)
302 const struct lttng_event_desc
*desc
;
304 assert(event_notifier
->registered
== 1);
305 desc
= event_notifier
->desc
;
306 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
307 desc
->u
.ext
.event_notifier_callback
, event_notifier
);
310 event_notifier
->registered
= 0;
314 * Only used internally at session destruction.
317 void _lttng_event_unregister(struct lttng_event
*event
)
319 if (event
->priv
->registered
)
320 unregister_event(event
);
324 * Only used internally at session destruction.
327 void _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
)
329 if (event_notifier
->registered
)
330 unregister_event_notifier(event_notifier
);
333 void lttng_session_destroy(struct lttng_session
*session
)
335 struct lttng_channel
*chan
, *tmpchan
;
336 struct lttng_ust_event_private
*event_priv
, *tmpevent_priv
;
337 struct lttng_enum
*_enum
, *tmp_enum
;
338 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
340 CMM_ACCESS_ONCE(session
->active
) = 0;
341 cds_list_for_each_entry(event_priv
, &session
->priv
->events_head
, node
) {
342 _lttng_event_unregister(event_priv
->pub
);
344 lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */
345 __tracepoint_probe_prune_release_queue();
346 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
347 &session
->priv
->enablers_head
, node
)
348 lttng_event_enabler_destroy(event_enabler
);
349 cds_list_for_each_entry_safe(event_priv
, tmpevent_priv
,
350 &session
->priv
->events_head
, node
)
351 _lttng_event_destroy(event_priv
->pub
);
352 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
353 &session
->priv
->enums_head
, node
)
354 _lttng_enum_destroy(_enum
);
355 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->priv
->chan_head
, node
)
356 _lttng_channel_unmap(chan
);
357 cds_list_del(&session
->priv
->node
);
358 lttng_destroy_context(session
->priv
->ctx
);
363 void lttng_event_notifier_group_destroy(
364 struct lttng_event_notifier_group
*event_notifier_group
)
367 struct lttng_event_notifier_enabler
*notifier_enabler
, *tmpnotifier_enabler
;
368 struct lttng_event_notifier
*notifier
, *tmpnotifier
;
370 if (!event_notifier_group
) {
374 cds_list_for_each_entry(notifier
,
375 &event_notifier_group
->event_notifiers_head
, node
)
376 _lttng_event_notifier_unregister(notifier
);
378 lttng_ust_urcu_synchronize_rcu();
380 cds_list_for_each_entry_safe(notifier_enabler
, tmpnotifier_enabler
,
381 &event_notifier_group
->enablers_head
, node
)
382 lttng_event_notifier_enabler_destroy(notifier_enabler
);
384 cds_list_for_each_entry_safe(notifier
, tmpnotifier
,
385 &event_notifier_group
->event_notifiers_head
, node
)
386 _lttng_event_notifier_destroy(notifier
);
388 if (event_notifier_group
->error_counter
)
389 lttng_ust_counter_destroy(event_notifier_group
->error_counter
);
391 /* Close the notification fd to the listener of event_notifiers. */
393 lttng_ust_lock_fd_tracker();
394 close_ret
= close(event_notifier_group
->notification_fd
);
396 lttng_ust_delete_fd_from_tracker(
397 event_notifier_group
->notification_fd
);
402 lttng_ust_unlock_fd_tracker();
404 cds_list_del(&event_notifier_group
->node
);
406 free(event_notifier_group
);
410 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
412 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
413 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
419 /* Destroy filter bytecode */
420 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
421 &enabler
->filter_bytecode_head
, node
) {
425 /* Destroy excluders */
426 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
427 &enabler
->excluder_head
, node
) {
432 void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
434 if (!event_notifier_enabler
) {
438 cds_list_del(&event_notifier_enabler
->node
);
440 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
442 free(event_notifier_enabler
);
446 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
447 struct lttng_session
*session
)
449 const char *enum_name
= desc
->name
;
450 struct lttng_enum
*_enum
;
451 struct cds_hlist_head
*head
;
453 size_t name_len
= strlen(enum_name
);
457 /* Check if this enum is already registered for this session. */
458 hash
= jhash(enum_name
, name_len
, 0);
459 head
= &session
->priv
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
461 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
467 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
468 if (notify_socket
< 0) {
473 _enum
= zmalloc(sizeof(*_enum
));
478 _enum
->session
= session
;
481 ret
= ustcomm_register_enum(notify_socket
,
488 DBG("Error (%d) registering enumeration to sessiond", ret
);
489 goto sessiond_register_error
;
491 cds_list_add(&_enum
->node
, &session
->priv
->enums_head
);
492 cds_hlist_add_head(&_enum
->hlist
, head
);
495 sessiond_register_error
:
504 int lttng_create_enum_check(const struct lttng_type
*type
,
505 struct lttng_session
*session
)
507 switch (type
->atype
) {
508 case atype_enum_nestable
:
510 const struct lttng_enum_desc
*enum_desc
;
513 enum_desc
= type
->u
.enum_nestable
.desc
;
514 ret
= lttng_enum_create(enum_desc
, session
);
515 if (ret
&& ret
!= -EEXIST
) {
516 DBG("Unable to create enum error: (%d)", ret
);
523 const struct lttng_event_field
*tag_field_generic
;
524 const struct lttng_enum_desc
*enum_desc
;
527 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
528 enum_desc
= tag_field_generic
->type
.u
.enum_nestable
.desc
;
529 ret
= lttng_enum_create(enum_desc
, session
);
530 if (ret
&& ret
!= -EEXIST
) {
531 DBG("Unable to create enum error: (%d)", ret
);
537 /* TODO: nested types when they become supported. */
544 int lttng_create_all_event_enums(size_t nr_fields
,
545 const struct lttng_event_field
*event_fields
,
546 struct lttng_session
*session
)
551 /* For each field, ensure enum is part of the session. */
552 for (i
= 0; i
< nr_fields
; i
++) {
553 const struct lttng_type
*type
= &event_fields
[i
].type
;
555 ret
= lttng_create_enum_check(type
, session
);
563 int lttng_create_all_ctx_enums(size_t nr_fields
,
564 const struct lttng_ctx_field
*ctx_fields
,
565 struct lttng_session
*session
)
570 /* For each field, ensure enum is part of the session. */
571 for (i
= 0; i
< nr_fields
; i
++) {
572 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
574 ret
= lttng_create_enum_check(type
, session
);
582 * Ensure that a state-dump will be performed for this session at the end
583 * of the current handle_message().
585 int lttng_session_statedump(struct lttng_session
*session
)
587 session
->priv
->statedump_pending
= 1;
588 lttng_ust_sockinfo_session_enabled(session
->priv
->owner
);
592 int lttng_session_enable(struct lttng_session
*session
)
595 struct lttng_channel
*chan
;
598 if (session
->active
) {
603 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
604 if (notify_socket
< 0)
605 return notify_socket
;
607 /* Set transient enabler state to "enabled" */
608 session
->priv
->tstate
= 1;
610 /* We need to sync enablers with session before activation. */
611 lttng_session_sync_event_enablers(session
);
614 * Snapshot the number of events per channel to know the type of header
617 cds_list_for_each_entry(chan
, &session
->priv
->chan_head
, node
) {
618 const struct lttng_ctx
*ctx
;
619 const struct lttng_ctx_field
*fields
= NULL
;
620 size_t nr_fields
= 0;
623 /* don't change it if session stop/restart */
624 if (chan
->header_type
)
628 nr_fields
= ctx
->nr_fields
;
629 fields
= ctx
->fields
;
630 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
633 DBG("Error (%d) adding enum to session", ret
);
637 ret
= ustcomm_register_channel(notify_socket
,
646 DBG("Error (%d) registering channel to sessiond", ret
);
649 if (chan_id
!= chan
->id
) {
650 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
656 /* Set atomically the state to "active" */
657 CMM_ACCESS_ONCE(session
->active
) = 1;
658 CMM_ACCESS_ONCE(session
->priv
->been_active
) = 1;
660 ret
= lttng_session_statedump(session
);
667 int lttng_session_disable(struct lttng_session
*session
)
671 if (!session
->active
) {
675 /* Set atomically the state to "inactive" */
676 CMM_ACCESS_ONCE(session
->active
) = 0;
678 /* Set transient enabler state to "disabled" */
679 session
->priv
->tstate
= 0;
680 lttng_session_sync_event_enablers(session
);
685 int lttng_channel_enable(struct lttng_channel
*channel
)
689 if (channel
->enabled
) {
693 /* Set transient enabler state to "enabled" */
695 lttng_session_sync_event_enablers(channel
->session
);
696 /* Set atomically the state to "enabled" */
697 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
702 int lttng_channel_disable(struct lttng_channel
*channel
)
706 if (!channel
->enabled
) {
710 /* Set atomically the state to "disabled" */
711 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
712 /* Set transient enabler state to "enabled" */
714 lttng_session_sync_event_enablers(channel
->session
);
720 struct cds_hlist_head
*borrow_hash_table_bucket(
721 struct cds_hlist_head
*hash_table
,
722 unsigned int hash_table_size
,
723 const struct lttng_event_desc
*desc
)
725 const char *event_name
;
729 event_name
= desc
->name
;
730 name_len
= strlen(event_name
);
732 hash
= jhash(event_name
, name_len
, 0);
733 return &hash_table
[hash
& (hash_table_size
- 1)];
737 * Supports event creation while tracing session is active.
740 int lttng_event_create(const struct lttng_event_desc
*desc
,
741 struct lttng_channel
*chan
)
743 struct lttng_event
*event
;
744 struct lttng_ust_event_private
*event_priv
;
745 struct lttng_session
*session
= chan
->session
;
746 struct cds_hlist_head
*head
;
748 int notify_socket
, loglevel
;
751 head
= borrow_hash_table_bucket(chan
->session
->priv
->events_ht
.table
,
752 LTTNG_UST_EVENT_HT_SIZE
, desc
);
754 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
755 if (notify_socket
< 0) {
760 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
763 DBG("Error (%d) adding enum to session", ret
);
764 goto create_enum_error
;
768 * Check if loglevel match. Refuse to connect event if not.
770 event
= zmalloc(sizeof(struct lttng_event
));
775 event
->struct_size
= sizeof(struct lttng_event
);
776 event_priv
= zmalloc(sizeof(struct lttng_ust_event_private
));
781 event
->priv
= event_priv
;
782 event_priv
->pub
= event
;
785 /* Event will be enabled by enabler sync. */
787 event
->priv
->registered
= 0;
788 CDS_INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
789 CDS_INIT_LIST_HEAD(&event
->priv
->enablers_ref_head
);
790 event
->priv
->desc
= desc
;
793 loglevel
= *(*event
->priv
->desc
->loglevel
);
795 loglevel
= TRACE_DEFAULT
;
796 if (desc
->u
.ext
.model_emf_uri
)
797 uri
= *(desc
->u
.ext
.model_emf_uri
);
801 /* Fetch event ID from sessiond */
802 ret
= ustcomm_register_event(notify_socket
,
814 DBG("Error (%d) registering event to sessiond", ret
);
815 goto sessiond_register_error
;
818 cds_list_add(&event
->priv
->node
, &chan
->session
->priv
->events_head
);
819 cds_hlist_add_head(&event
->priv
->hlist
, head
);
822 sessiond_register_error
:
833 int lttng_event_notifier_create(const struct lttng_event_desc
*desc
,
834 uint64_t token
, uint64_t error_counter_index
,
835 struct lttng_event_notifier_group
*event_notifier_group
)
837 struct lttng_event_notifier
*event_notifier
;
838 struct cds_hlist_head
*head
;
842 * Get the hashtable bucket the created lttng_event_notifier object
843 * should be inserted.
845 head
= borrow_hash_table_bucket(
846 event_notifier_group
->event_notifiers_ht
.table
,
847 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
849 event_notifier
= zmalloc(sizeof(struct lttng_event_notifier
));
850 if (!event_notifier
) {
855 event_notifier
->group
= event_notifier_group
;
856 event_notifier
->user_token
= token
;
857 event_notifier
->error_counter_index
= error_counter_index
;
859 /* Event notifier will be enabled by enabler sync. */
860 event_notifier
->enabled
= 0;
861 event_notifier
->registered
= 0;
863 CDS_INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
864 CDS_INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
865 CDS_INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
866 event_notifier
->desc
= desc
;
867 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
869 cds_list_add(&event_notifier
->node
,
870 &event_notifier_group
->event_notifiers_head
);
871 cds_hlist_add_head(&event_notifier
->hlist
, head
);
880 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
882 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
884 /* Remove from event_notifier list. */
885 cds_list_del(&event_notifier
->node
);
886 /* Remove from event_notifier hash table. */
887 cds_hlist_del(&event_notifier
->hlist
);
889 lttng_free_event_notifier_filter_runtime(event_notifier
);
891 /* Free event_notifier enabler refs */
892 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
893 &event_notifier
->enablers_ref_head
, node
)
895 free(event_notifier
);
899 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
900 struct lttng_enabler
*enabler
)
903 unsigned int has_loglevel
= 0;
905 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
906 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
907 desc
->name
, SIZE_MAX
))
909 if (desc
->loglevel
) {
910 loglevel
= *(*desc
->loglevel
);
913 if (!lttng_loglevel_match(loglevel
,
915 enabler
->event_param
.loglevel_type
,
916 enabler
->event_param
.loglevel
))
922 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
923 struct lttng_enabler
*enabler
)
926 unsigned int has_loglevel
= 0;
928 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
929 if (strcmp(desc
->name
, enabler
->event_param
.name
))
931 if (desc
->loglevel
) {
932 loglevel
= *(*desc
->loglevel
);
935 if (!lttng_loglevel_match(loglevel
,
937 enabler
->event_param
.loglevel_type
,
938 enabler
->event_param
.loglevel
))
944 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
945 struct lttng_enabler
*enabler
)
947 switch (enabler
->format_type
) {
948 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
950 struct lttng_ust_excluder_node
*excluder
;
952 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
957 * If the matching event matches with an excluder,
958 * return 'does not match'
960 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
963 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
967 excluder_name
= (char *) (excluder
->excluder
.names
)
968 + count
* LTTNG_UST_SYM_NAME_LEN
;
969 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
970 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
976 case LTTNG_ENABLER_FORMAT_EVENT
:
977 return lttng_desc_match_event_enabler(desc
, enabler
);
984 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
985 struct lttng_event
*event
)
987 if (lttng_desc_match_enabler(event
->priv
->desc
,
988 lttng_event_enabler_as_enabler(event_enabler
))
989 && event
->chan
== event_enabler
->chan
)
996 int lttng_event_notifier_enabler_match_event_notifier(
997 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
998 struct lttng_event_notifier
*event_notifier
)
1000 int desc_matches
= lttng_desc_match_enabler(event_notifier
->desc
,
1001 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1003 if (desc_matches
&& event_notifier
->group
== event_notifier_enabler
->group
&&
1004 event_notifier
->user_token
== event_notifier_enabler
->user_token
)
1011 struct lttng_enabler_ref
*lttng_enabler_ref(
1012 struct cds_list_head
*enabler_ref_list
,
1013 struct lttng_enabler
*enabler
)
1015 struct lttng_enabler_ref
*enabler_ref
;
1017 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
1018 if (enabler_ref
->ref
== enabler
)
1025 * Create struct lttng_event if it is missing and present in the list of
1026 * tracepoint probes.
1029 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1031 struct lttng_session
*session
= event_enabler
->chan
->session
;
1032 struct lttng_probe_desc
*probe_desc
;
1033 const struct lttng_event_desc
*desc
;
1034 struct lttng_ust_event_private
*event_priv
;
1036 struct cds_list_head
*probe_list
;
1038 probe_list
= lttng_get_probe_list_head();
1040 * For each probe event, if we find that a probe event matches
1041 * our enabler, create an associated lttng_event if not
1044 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1045 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1048 struct cds_hlist_head
*head
;
1049 struct cds_hlist_node
*node
;
1051 desc
= probe_desc
->event_desc
[i
];
1052 if (!lttng_desc_match_enabler(desc
,
1053 lttng_event_enabler_as_enabler(event_enabler
)))
1056 head
= borrow_hash_table_bucket(
1057 session
->priv
->events_ht
.table
,
1058 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1060 cds_hlist_for_each_entry(event_priv
, node
, head
, hlist
) {
1061 if (event_priv
->desc
== desc
1062 && event_priv
->pub
->chan
== event_enabler
->chan
) {
1071 * We need to create an event for this
1074 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
1075 event_enabler
->chan
);
1077 DBG("Unable to create event %s, error %d\n",
1078 probe_desc
->event_desc
[i
]->name
, ret
);
1085 void probe_provider_event_for_each(struct lttng_probe_desc
*provider_desc
,
1086 void (*event_func
)(struct lttng_session
*session
,
1087 struct lttng_event
*event
),
1088 void (*event_notifier_func
)(struct lttng_event_notifier
*event_notifier
))
1090 struct cds_hlist_node
*node
, *tmp_node
;
1091 struct cds_list_head
*sessionsp
;
1094 /* Get handle on list of sessions. */
1095 sessionsp
= lttng_get_sessions();
1098 * Iterate over all events in the probe provider descriptions and
1099 * sessions to queue the unregistration of the events.
1101 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
1102 const struct lttng_event_desc
*event_desc
;
1103 struct lttng_event_notifier_group
*event_notifier_group
;
1104 struct lttng_event_notifier
*event_notifier
;
1105 struct lttng_ust_session_private
*session_priv
;
1106 struct cds_hlist_head
*head
;
1107 struct lttng_ust_event_private
*event_priv
;
1109 event_desc
= provider_desc
->event_desc
[i
];
1112 * Iterate over all session to find the current event
1115 cds_list_for_each_entry(session_priv
, sessionsp
, node
) {
1117 * Get the list of events in the hashtable bucket and
1118 * iterate to find the event matching this descriptor.
1120 head
= borrow_hash_table_bucket(
1121 session_priv
->events_ht
.table
,
1122 LTTNG_UST_EVENT_HT_SIZE
, event_desc
);
1124 cds_hlist_for_each_entry_safe(event_priv
, node
, tmp_node
, head
, hlist
) {
1125 if (event_desc
== event_priv
->desc
) {
1126 event_func(session_priv
->pub
, event_priv
->pub
);
1133 * Iterate over all event_notifier groups to find the current event
1136 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1138 * Get the list of event_notifiers in the hashtable bucket and
1139 * iterate to find the event_notifier matching this
1142 head
= borrow_hash_table_bucket(
1143 event_notifier_group
->event_notifiers_ht
.table
,
1144 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, event_desc
);
1146 cds_hlist_for_each_entry_safe(event_notifier
, node
, tmp_node
, head
, hlist
) {
1147 if (event_desc
== event_notifier
->desc
) {
1148 event_notifier_func(event_notifier
);
1157 void _unregister_event(struct lttng_session
*session
,
1158 struct lttng_event
*event
)
1160 _lttng_event_unregister(event
);
1164 void _event_enum_destroy(struct lttng_session
*session
,
1165 struct lttng_event
*event
)
1169 /* Destroy enums of the current event. */
1170 for (i
= 0; i
< event
->priv
->desc
->nr_fields
; i
++) {
1171 const struct lttng_enum_desc
*enum_desc
;
1172 const struct lttng_event_field
*field
;
1173 struct lttng_enum
*curr_enum
;
1175 field
= &(event
->priv
->desc
->fields
[i
]);
1176 switch (field
->type
.atype
) {
1177 case atype_enum_nestable
:
1178 enum_desc
= field
->type
.u
.enum_nestable
.desc
;
1184 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1186 _lttng_enum_destroy(curr_enum
);
1190 /* Destroy event. */
1191 _lttng_event_destroy(event
);
1195 * Iterate over all the UST sessions to unregister and destroy all probes from
1196 * the probe provider descriptor received as argument. Must me called with the
1199 void lttng_probe_provider_unregister_events(
1200 struct lttng_probe_desc
*provider_desc
)
1203 * Iterate over all events in the probe provider descriptions and sessions
1204 * to queue the unregistration of the events.
1206 probe_provider_event_for_each(provider_desc
, _unregister_event
,
1207 _lttng_event_notifier_unregister
);
1209 /* Wait for grace period. */
1210 lttng_ust_urcu_synchronize_rcu();
1211 /* Prune the unregistration queue. */
1212 __tracepoint_probe_prune_release_queue();
1215 * It is now safe to destroy the events and remove them from the event list
1218 probe_provider_event_for_each(provider_desc
, _event_enum_destroy
,
1219 _lttng_event_notifier_destroy
);
1223 * Create events associated with an event enabler (if not already present),
1224 * and add backward reference from the event to the enabler.
1227 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1229 struct lttng_session
*session
= event_enabler
->chan
->session
;
1230 struct lttng_ust_event_private
*event_priv
;
1232 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1235 /* First ensure that probe events are created for this enabler. */
1236 lttng_create_event_if_missing(event_enabler
);
1238 /* For each event matching enabler in session event list. */
1239 cds_list_for_each_entry(event_priv
, &session
->priv
->events_head
, node
) {
1240 struct lttng_enabler_ref
*enabler_ref
;
1242 if (!lttng_event_enabler_match_event(event_enabler
, event_priv
->pub
))
1245 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
,
1246 lttng_event_enabler_as_enabler(event_enabler
));
1249 * If no backward ref, create it.
1250 * Add backward ref from event to enabler.
1252 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1255 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1257 cds_list_add(&enabler_ref
->node
,
1258 &event_priv
->enablers_ref_head
);
1262 * Link filter bytecodes if not linked yet.
1264 lttng_enabler_link_bytecode(event_priv
->desc
,
1265 &session
->priv
->ctx
,
1266 &event_priv
->pub
->filter_bytecode_runtime_head
,
1267 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1269 /* TODO: merge event context. */
1276 * Called at library load: connect the probe on all enablers matching
1278 * Called with session mutex held.
1280 int lttng_fix_pending_events(void)
1282 struct lttng_ust_session_private
*session_priv
;
1284 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1285 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
1290 int lttng_fix_pending_event_notifiers(void)
1292 struct lttng_event_notifier_group
*event_notifier_group
;
1294 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1295 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1301 * For each session of the owner thread, execute pending statedump.
1302 * Only dump state for the sessions owned by the caller thread, because
1303 * we don't keep ust_lock across the entire iteration.
1305 void lttng_handle_pending_statedump(void *owner
)
1307 struct lttng_ust_session_private
*session_priv
;
1309 /* Execute state dump */
1310 do_lttng_ust_statedump(owner
);
1312 /* Clear pending state dump */
1316 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1317 if (session_priv
->owner
!= owner
)
1319 if (!session_priv
->statedump_pending
)
1321 session_priv
->statedump_pending
= 0;
1329 * Only used internally at session destruction.
1332 void _lttng_event_destroy(struct lttng_event
*event
)
1334 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1336 /* Remove from event list. */
1337 cds_list_del(&event
->priv
->node
);
1338 /* Remove from event hash table. */
1339 cds_hlist_del(&event
->priv
->hlist
);
1341 lttng_destroy_context(event
->ctx
);
1342 lttng_free_event_filter_runtime(event
);
1343 /* Free event enabler refs */
1344 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1345 &event
->priv
->enablers_ref_head
, node
)
1352 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1354 cds_list_del(&_enum
->node
);
1355 cds_hlist_del(&_enum
->hlist
);
1359 void lttng_ust_events_exit(void)
1361 struct lttng_ust_session_private
*session_priv
, *tmpsession_priv
;
1363 cds_list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, node
)
1364 lttng_session_destroy(session_priv
->pub
);
1368 * Enabler management.
1370 struct lttng_event_enabler
*lttng_event_enabler_create(
1371 enum lttng_enabler_format_type format_type
,
1372 struct lttng_ust_event
*event_param
,
1373 struct lttng_channel
*chan
)
1375 struct lttng_event_enabler
*event_enabler
;
1377 event_enabler
= zmalloc(sizeof(*event_enabler
));
1380 event_enabler
->base
.format_type
= format_type
;
1381 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1382 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1383 memcpy(&event_enabler
->base
.event_param
, event_param
,
1384 sizeof(event_enabler
->base
.event_param
));
1385 event_enabler
->chan
= chan
;
1387 event_enabler
->base
.enabled
= 0;
1388 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->priv
->enablers_head
);
1389 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1391 return event_enabler
;
1394 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1395 struct lttng_event_notifier_group
*event_notifier_group
,
1396 enum lttng_enabler_format_type format_type
,
1397 struct lttng_ust_event_notifier
*event_notifier_param
)
1399 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1401 event_notifier_enabler
= zmalloc(sizeof(*event_notifier_enabler
));
1402 if (!event_notifier_enabler
)
1404 event_notifier_enabler
->base
.format_type
= format_type
;
1405 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1406 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
1407 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.excluder_head
);
1409 event_notifier_enabler
->user_token
= event_notifier_param
->event
.token
;
1410 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
1411 event_notifier_enabler
->num_captures
= 0;
1413 memcpy(&event_notifier_enabler
->base
.event_param
.name
,
1414 event_notifier_param
->event
.name
,
1415 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1416 event_notifier_enabler
->base
.event_param
.instrumentation
=
1417 event_notifier_param
->event
.instrumentation
;
1418 event_notifier_enabler
->base
.event_param
.loglevel
=
1419 event_notifier_param
->event
.loglevel
;
1420 event_notifier_enabler
->base
.event_param
.loglevel_type
=
1421 event_notifier_param
->event
.loglevel_type
;
1423 event_notifier_enabler
->base
.enabled
= 0;
1424 event_notifier_enabler
->group
= event_notifier_group
;
1426 cds_list_add(&event_notifier_enabler
->node
,
1427 &event_notifier_group
->enablers_head
);
1429 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1431 return event_notifier_enabler
;
1434 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1436 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1437 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1442 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1444 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1445 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1451 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1452 struct lttng_ust_bytecode_node
**bytecode
)
1454 (*bytecode
)->enabler
= enabler
;
1455 cds_list_add_tail(&(*bytecode
)->node
, &enabler
->filter_bytecode_head
);
1456 /* Take ownership of bytecode */
1460 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1461 struct lttng_ust_bytecode_node
**bytecode
)
1463 _lttng_enabler_attach_filter_bytecode(
1464 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1466 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1471 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1472 struct lttng_ust_excluder_node
**excluder
)
1474 (*excluder
)->enabler
= enabler
;
1475 cds_list_add_tail(&(*excluder
)->node
, &enabler
->excluder_head
);
1476 /* Take ownership of excluder */
1480 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1481 struct lttng_ust_excluder_node
**excluder
)
1483 _lttng_enabler_attach_exclusion(
1484 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1486 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1490 int lttng_event_notifier_enabler_enable(
1491 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1493 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
1494 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1499 int lttng_event_notifier_enabler_disable(
1500 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1502 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
1503 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1508 int lttng_event_notifier_enabler_attach_filter_bytecode(
1509 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1510 struct lttng_ust_bytecode_node
**bytecode
)
1512 _lttng_enabler_attach_filter_bytecode(
1513 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1516 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1520 int lttng_event_notifier_enabler_attach_capture_bytecode(
1521 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1522 struct lttng_ust_bytecode_node
**bytecode
)
1524 (*bytecode
)->enabler
= lttng_event_notifier_enabler_as_enabler(
1525 event_notifier_enabler
);
1526 cds_list_add_tail(&(*bytecode
)->node
,
1527 &event_notifier_enabler
->capture_bytecode_head
);
1528 /* Take ownership of bytecode */
1530 event_notifier_enabler
->num_captures
++;
1532 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1536 int lttng_event_notifier_enabler_attach_exclusion(
1537 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1538 struct lttng_ust_excluder_node
**excluder
)
1540 _lttng_enabler_attach_exclusion(
1541 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1544 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1548 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1549 union ust_args
*uargs
,
1550 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1553 * We cannot attach a context after trace has been started for a
1554 * session because the metadata does not allow expressing this
1555 * information outside of the original channel scope.
1557 if (session
->priv
->been_active
)
1560 switch (context_param
->ctx
) {
1561 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1562 return lttng_add_pthread_id_to_ctx(ctx
);
1563 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1565 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1567 perf_ctx_param
= &context_param
->u
.perf_counter
;
1568 return lttng_add_perf_counter_to_ctx(
1569 perf_ctx_param
->type
,
1570 perf_ctx_param
->config
,
1571 perf_ctx_param
->name
,
1574 case LTTNG_UST_CONTEXT_VTID
:
1575 return lttng_add_vtid_to_ctx(ctx
);
1576 case LTTNG_UST_CONTEXT_VPID
:
1577 return lttng_add_vpid_to_ctx(ctx
);
1578 case LTTNG_UST_CONTEXT_PROCNAME
:
1579 return lttng_add_procname_to_ctx(ctx
);
1580 case LTTNG_UST_CONTEXT_IP
:
1581 return lttng_add_ip_to_ctx(ctx
);
1582 case LTTNG_UST_CONTEXT_CPU_ID
:
1583 return lttng_add_cpu_id_to_ctx(ctx
);
1584 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1585 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1587 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1588 return lttng_add_cgroup_ns_to_ctx(ctx
);
1589 case LTTNG_UST_CONTEXT_IPC_NS
:
1590 return lttng_add_ipc_ns_to_ctx(ctx
);
1591 case LTTNG_UST_CONTEXT_MNT_NS
:
1592 return lttng_add_mnt_ns_to_ctx(ctx
);
1593 case LTTNG_UST_CONTEXT_NET_NS
:
1594 return lttng_add_net_ns_to_ctx(ctx
);
1595 case LTTNG_UST_CONTEXT_PID_NS
:
1596 return lttng_add_pid_ns_to_ctx(ctx
);
1597 case LTTNG_UST_CONTEXT_TIME_NS
:
1598 return lttng_add_time_ns_to_ctx(ctx
);
1599 case LTTNG_UST_CONTEXT_USER_NS
:
1600 return lttng_add_user_ns_to_ctx(ctx
);
1601 case LTTNG_UST_CONTEXT_UTS_NS
:
1602 return lttng_add_uts_ns_to_ctx(ctx
);
1603 case LTTNG_UST_CONTEXT_VUID
:
1604 return lttng_add_vuid_to_ctx(ctx
);
1605 case LTTNG_UST_CONTEXT_VEUID
:
1606 return lttng_add_veuid_to_ctx(ctx
);
1607 case LTTNG_UST_CONTEXT_VSUID
:
1608 return lttng_add_vsuid_to_ctx(ctx
);
1609 case LTTNG_UST_CONTEXT_VGID
:
1610 return lttng_add_vgid_to_ctx(ctx
);
1611 case LTTNG_UST_CONTEXT_VEGID
:
1612 return lttng_add_vegid_to_ctx(ctx
);
1613 case LTTNG_UST_CONTEXT_VSGID
:
1614 return lttng_add_vsgid_to_ctx(ctx
);
1620 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*enabler
,
1621 struct lttng_ust_context
*context_param
)
1626 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1628 if (!event_enabler
) {
1631 cds_list_del(&event_enabler
->node
);
1633 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1635 lttng_destroy_context(event_enabler
->ctx
);
1636 free(event_enabler
);
1640 * lttng_session_sync_event_enablers should be called just before starting a
1644 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
1646 struct lttng_event_enabler
*event_enabler
;
1647 struct lttng_ust_event_private
*event_priv
;
1649 cds_list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
1650 lttng_event_enabler_ref_events(event_enabler
);
1652 * For each event, if at least one of its enablers is enabled,
1653 * and its channel and session transient states are enabled, we
1654 * enable the event, else we disable it.
1656 cds_list_for_each_entry(event_priv
, &session
->priv
->events_head
, node
) {
1657 struct lttng_enabler_ref
*enabler_ref
;
1658 struct lttng_bytecode_runtime
*runtime
;
1659 int enabled
= 0, has_enablers_without_bytecode
= 0;
1662 cds_list_for_each_entry(enabler_ref
,
1663 &event_priv
->enablers_ref_head
, node
) {
1664 if (enabler_ref
->ref
->enabled
) {
1670 * Enabled state is based on union of enablers, with
1671 * intesection of session and channel transient enable
1674 enabled
= enabled
&& session
->priv
->tstate
&& event_priv
->pub
->chan
->tstate
;
1676 CMM_STORE_SHARED(event_priv
->pub
->enabled
, enabled
);
1678 * Sync tracepoint registration with event enabled
1682 if (!event_priv
->registered
)
1683 register_event(event_priv
->pub
);
1685 if (event_priv
->registered
)
1686 unregister_event(event_priv
->pub
);
1689 /* Check if has enablers without bytecode enabled */
1690 cds_list_for_each_entry(enabler_ref
,
1691 &event_priv
->enablers_ref_head
, node
) {
1692 if (enabler_ref
->ref
->enabled
1693 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1694 has_enablers_without_bytecode
= 1;
1698 event_priv
->pub
->has_enablers_without_bytecode
=
1699 has_enablers_without_bytecode
;
1701 /* Enable filters */
1702 cds_list_for_each_entry(runtime
,
1703 &event_priv
->pub
->filter_bytecode_runtime_head
, node
) {
1704 lttng_bytecode_filter_sync_state(runtime
);
1707 __tracepoint_probe_prune_release_queue();
1710 /* Support for event notifier is introduced by probe provider major version 2. */
1712 bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc
*probe_desc
)
1714 return probe_desc
->major
>= 2;
1718 void lttng_create_event_notifier_if_missing(
1719 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1721 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1722 struct lttng_probe_desc
*probe_desc
;
1723 struct cds_list_head
*probe_list
;
1726 probe_list
= lttng_get_probe_list_head();
1728 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1729 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1732 const struct lttng_event_desc
*desc
;
1733 struct lttng_event_notifier
*event_notifier
;
1734 struct cds_hlist_head
*head
;
1735 struct cds_hlist_node
*node
;
1737 desc
= probe_desc
->event_desc
[i
];
1739 if (!lttng_desc_match_enabler(desc
,
1740 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1744 * Given the current event_notifier group, get the bucket that
1745 * the target event_notifier would be if it was already
1748 head
= borrow_hash_table_bucket(
1749 event_notifier_group
->event_notifiers_ht
.table
,
1750 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
1752 cds_hlist_for_each_entry(event_notifier
, node
, head
, hlist
) {
1754 * Check if event_notifier already exists by checking
1755 * if the event_notifier and enabler share the same
1756 * description and id.
1758 if (event_notifier
->desc
== desc
&&
1759 event_notifier
->user_token
== event_notifier_enabler
->user_token
) {
1768 /* Check that the probe supports event notifiers, else report the error. */
1769 if (!lttng_ust_probe_supports_event_notifier(probe_desc
)) {
1770 ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, "
1771 "but its version (%u.%u) is too old and does not implement event notifiers. "
1772 "It needs to be recompiled against a newer version of LTTng-UST, otherwise "
1773 "this event will not generate any notification.",
1774 probe_desc
->provider
,
1781 * We need to create a event_notifier for this event probe.
1783 ret
= lttng_event_notifier_create(desc
,
1784 event_notifier_enabler
->user_token
,
1785 event_notifier_enabler
->error_counter_index
,
1786 event_notifier_group
);
1788 DBG("Unable to create event_notifier %s, error %d\n",
1789 probe_desc
->event_desc
[i
]->name
, ret
);
1796 * Create event_notifiers associated with a event_notifier enabler (if not already present).
1799 int lttng_event_notifier_enabler_ref_event_notifiers(
1800 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1802 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1803 struct lttng_event_notifier
*event_notifier
;
1806 * Only try to create event_notifiers for enablers that are enabled, the user
1807 * might still be attaching filter or exclusion to the
1808 * event_notifier_enabler.
1810 if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
)
1813 /* First, ensure that probe event_notifiers are created for this enabler. */
1814 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
1816 /* Link the created event_notifier with its associated enabler. */
1817 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1818 struct lttng_enabler_ref
*enabler_ref
;
1820 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
1823 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
1824 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1827 * If no backward ref, create it.
1828 * Add backward ref from event_notifier to enabler.
1830 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1834 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
1835 event_notifier_enabler
);
1836 cds_list_add(&enabler_ref
->node
,
1837 &event_notifier
->enablers_ref_head
);
1841 * Link filter bytecodes if not linked yet.
1843 lttng_enabler_link_bytecode(event_notifier
->desc
,
1844 &event_notifier_group
->ctx
,
1845 &event_notifier
->filter_bytecode_runtime_head
,
1846 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
1849 * Link capture bytecodes if not linked yet.
1851 lttng_enabler_link_bytecode(event_notifier
->desc
,
1852 &event_notifier_group
->ctx
, &event_notifier
->capture_bytecode_runtime_head
,
1853 &event_notifier_enabler
->capture_bytecode_head
);
1855 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
1862 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
1864 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1865 struct lttng_event_notifier
*event_notifier
;
1867 cds_list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
1868 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
1871 * For each event_notifier, if at least one of its enablers is enabled,
1872 * we enable the event_notifier, else we disable it.
1874 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1875 struct lttng_enabler_ref
*enabler_ref
;
1876 struct lttng_bytecode_runtime
*runtime
;
1877 int enabled
= 0, has_enablers_without_bytecode
= 0;
1879 /* Enable event_notifiers */
1880 cds_list_for_each_entry(enabler_ref
,
1881 &event_notifier
->enablers_ref_head
, node
) {
1882 if (enabler_ref
->ref
->enabled
) {
1888 CMM_STORE_SHARED(event_notifier
->enabled
, enabled
);
1890 * Sync tracepoint registration with event_notifier enabled
1894 if (!event_notifier
->registered
)
1895 register_event_notifier(event_notifier
);
1897 if (event_notifier
->registered
)
1898 unregister_event_notifier(event_notifier
);
1901 /* Check if has enablers without bytecode enabled */
1902 cds_list_for_each_entry(enabler_ref
,
1903 &event_notifier
->enablers_ref_head
, node
) {
1904 if (enabler_ref
->ref
->enabled
1905 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1906 has_enablers_without_bytecode
= 1;
1910 event_notifier
->has_enablers_without_bytecode
=
1911 has_enablers_without_bytecode
;
1913 /* Enable filters */
1914 cds_list_for_each_entry(runtime
,
1915 &event_notifier
->filter_bytecode_runtime_head
, node
) {
1916 lttng_bytecode_filter_sync_state(runtime
);
1919 /* Enable captures. */
1920 cds_list_for_each_entry(runtime
,
1921 &event_notifier
->capture_bytecode_runtime_head
, node
) {
1922 lttng_bytecode_capture_sync_state(runtime
);
1925 __tracepoint_probe_prune_release_queue();
1929 * Apply enablers to session events, adding events to session if need
1930 * be. It is required after each modification applied to an active
1931 * session, and right before session "start".
1932 * "lazy" sync means we only sync if required.
1935 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
1937 /* We can skip if session is not active */
1938 if (!session
->active
)
1940 lttng_session_sync_event_enablers(session
);
1944 * Update all sessions with the given app context.
1945 * Called with ust lock held.
1946 * This is invoked when an application context gets loaded/unloaded. It
1947 * ensures the context callbacks are in sync with the application
1948 * context (either app context callbacks, or dummy callbacks).
1950 void lttng_ust_context_set_session_provider(const char *name
,
1951 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1952 void (*record
)(struct lttng_ctx_field
*field
,
1953 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1954 struct lttng_channel
*chan
),
1955 void (*get_value
)(struct lttng_ctx_field
*field
,
1956 struct lttng_ctx_value
*value
))
1958 struct lttng_ust_session_private
*session_priv
;
1960 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1961 struct lttng_channel
*chan
;
1962 struct lttng_ust_event_private
*event_priv
;
1965 ret
= lttng_ust_context_set_provider_rcu(&session_priv
->ctx
,
1966 name
, get_size
, record
, get_value
);
1969 cds_list_for_each_entry(chan
, &session_priv
->chan_head
, node
) {
1970 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1971 name
, get_size
, record
, get_value
);
1975 cds_list_for_each_entry(event_priv
, &session_priv
->events_head
, node
) {
1976 ret
= lttng_ust_context_set_provider_rcu(&event_priv
->pub
->ctx
,
1977 name
, get_size
, record
, get_value
);
1985 * Update all event_notifier groups with the given app context.
1986 * Called with ust lock held.
1987 * This is invoked when an application context gets loaded/unloaded. It
1988 * ensures the context callbacks are in sync with the application
1989 * context (either app context callbacks, or dummy callbacks).
1991 void lttng_ust_context_set_event_notifier_group_provider(const char *name
,
1992 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1993 void (*record
)(struct lttng_ctx_field
*field
,
1994 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1995 struct lttng_channel
*chan
),
1996 void (*get_value
)(struct lttng_ctx_field
*field
,
1997 struct lttng_ctx_value
*value
))
1999 struct lttng_event_notifier_group
*event_notifier_group
;
2001 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2004 ret
= lttng_ust_context_set_provider_rcu(
2005 &event_notifier_group
->ctx
,
2006 name
, get_size
, record
, get_value
);