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_priv
= zmalloc(sizeof(struct lttng_ust_session_private
));
146 session
->priv
= session_priv
;
147 session_priv
->pub
= session
;
148 if (lttng_context_init_all(&session
->priv
->ctx
)) {
153 CDS_INIT_LIST_HEAD(&session
->priv
->chan_head
);
154 CDS_INIT_LIST_HEAD(&session
->priv
->events_head
);
155 CDS_INIT_LIST_HEAD(&session
->priv
->enums_head
);
156 CDS_INIT_LIST_HEAD(&session
->priv
->enablers_head
);
157 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
158 CDS_INIT_HLIST_HEAD(&session
->priv
->events_ht
.table
[i
]);
159 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
160 CDS_INIT_HLIST_HEAD(&session
->priv
->enums_ht
.table
[i
]);
161 cds_list_add(&session
->priv
->node
, &sessions
);
165 struct lttng_counter
*lttng_ust_counter_create(
166 const char *counter_transport_name
,
167 size_t number_dimensions
, const struct lttng_counter_dimension
*dimensions
)
169 struct lttng_counter_transport
*counter_transport
= NULL
;
170 struct lttng_counter
*counter
= NULL
;
172 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
173 if (!counter_transport
)
175 counter
= zmalloc(sizeof(struct lttng_counter
));
179 counter
->ops
= &counter_transport
->ops
;
180 counter
->transport
= counter_transport
;
182 counter
->counter
= counter
->ops
->counter_create(
183 number_dimensions
, dimensions
, 0,
185 if (!counter
->counter
) {
199 void lttng_ust_counter_destroy(struct lttng_counter
*counter
)
201 counter
->ops
->counter_destroy(counter
->counter
);
205 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
207 struct lttng_event_notifier_group
*event_notifier_group
;
210 event_notifier_group
= zmalloc(sizeof(struct lttng_event_notifier_group
));
211 if (!event_notifier_group
)
214 /* Add all contexts. */
215 if (lttng_context_init_all(&event_notifier_group
->ctx
)) {
216 free(event_notifier_group
);
220 CDS_INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
221 CDS_INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
222 for (i
= 0; i
< LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
; i
++)
223 CDS_INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
225 cds_list_add(&event_notifier_group
->node
, &event_notifier_groups
);
227 return event_notifier_group
;
231 * Only used internally at session destruction.
234 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
236 struct channel
*chan
;
237 struct lttng_ust_shm_handle
*handle
;
239 cds_list_del(<tng_chan
->node
);
240 lttng_destroy_context(lttng_chan
->ctx
);
241 chan
= lttng_chan
->chan
;
242 handle
= lttng_chan
->handle
;
244 * note: lttng_chan is private data contained within handle. It
245 * will be freed along with the handle.
247 channel_destroy(chan
, handle
, 0);
251 void register_event(struct lttng_event
*event
)
254 const struct lttng_event_desc
*desc
;
256 assert(event
->priv
->registered
== 0);
257 desc
= event
->priv
->desc
;
258 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
259 desc
->probe_callback
,
260 event
, desc
->signature
);
263 event
->priv
->registered
= 1;
267 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
270 const struct lttng_event_desc
*desc
;
272 assert(event_notifier
->registered
== 0);
273 desc
= event_notifier
->desc
;
274 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
275 desc
->u
.ext
.event_notifier_callback
, event_notifier
, desc
->signature
);
278 event_notifier
->registered
= 1;
282 void unregister_event(struct lttng_event
*event
)
285 const struct lttng_event_desc
*desc
;
287 assert(event
->priv
->registered
== 1);
288 desc
= event
->priv
->desc
;
289 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
290 desc
->probe_callback
,
294 event
->priv
->registered
= 0;
298 void unregister_event_notifier(struct lttng_event_notifier
*event_notifier
)
301 const struct lttng_event_desc
*desc
;
303 assert(event_notifier
->registered
== 1);
304 desc
= event_notifier
->desc
;
305 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
306 desc
->u
.ext
.event_notifier_callback
, event_notifier
);
309 event_notifier
->registered
= 0;
313 * Only used internally at session destruction.
316 void _lttng_event_unregister(struct lttng_event
*event
)
318 if (event
->priv
->registered
)
319 unregister_event(event
);
323 * Only used internally at session destruction.
326 void _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
)
328 if (event_notifier
->registered
)
329 unregister_event_notifier(event_notifier
);
332 void lttng_session_destroy(struct lttng_session
*session
)
334 struct lttng_channel
*chan
, *tmpchan
;
335 struct lttng_ust_event_private
*event_priv
, *tmpevent_priv
;
336 struct lttng_enum
*_enum
, *tmp_enum
;
337 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
339 CMM_ACCESS_ONCE(session
->active
) = 0;
340 cds_list_for_each_entry(event_priv
, &session
->priv
->events_head
, node
) {
341 _lttng_event_unregister(event_priv
->pub
);
343 lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */
344 __tracepoint_probe_prune_release_queue();
345 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
346 &session
->priv
->enablers_head
, node
)
347 lttng_event_enabler_destroy(event_enabler
);
348 cds_list_for_each_entry_safe(event_priv
, tmpevent_priv
,
349 &session
->priv
->events_head
, node
)
350 _lttng_event_destroy(event_priv
->pub
);
351 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
352 &session
->priv
->enums_head
, node
)
353 _lttng_enum_destroy(_enum
);
354 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->priv
->chan_head
, node
)
355 _lttng_channel_unmap(chan
);
356 cds_list_del(&session
->priv
->node
);
357 lttng_destroy_context(session
->priv
->ctx
);
362 void lttng_event_notifier_group_destroy(
363 struct lttng_event_notifier_group
*event_notifier_group
)
366 struct lttng_event_notifier_enabler
*notifier_enabler
, *tmpnotifier_enabler
;
367 struct lttng_event_notifier
*notifier
, *tmpnotifier
;
369 if (!event_notifier_group
) {
373 cds_list_for_each_entry(notifier
,
374 &event_notifier_group
->event_notifiers_head
, node
)
375 _lttng_event_notifier_unregister(notifier
);
377 lttng_ust_urcu_synchronize_rcu();
379 cds_list_for_each_entry_safe(notifier_enabler
, tmpnotifier_enabler
,
380 &event_notifier_group
->enablers_head
, node
)
381 lttng_event_notifier_enabler_destroy(notifier_enabler
);
383 cds_list_for_each_entry_safe(notifier
, tmpnotifier
,
384 &event_notifier_group
->event_notifiers_head
, node
)
385 _lttng_event_notifier_destroy(notifier
);
387 if (event_notifier_group
->error_counter
)
388 lttng_ust_counter_destroy(event_notifier_group
->error_counter
);
390 /* Close the notification fd to the listener of event_notifiers. */
392 lttng_ust_lock_fd_tracker();
393 close_ret
= close(event_notifier_group
->notification_fd
);
395 lttng_ust_delete_fd_from_tracker(
396 event_notifier_group
->notification_fd
);
401 lttng_ust_unlock_fd_tracker();
403 cds_list_del(&event_notifier_group
->node
);
405 free(event_notifier_group
);
409 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
411 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
412 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
418 /* Destroy filter bytecode */
419 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
420 &enabler
->filter_bytecode_head
, node
) {
424 /* Destroy excluders */
425 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
426 &enabler
->excluder_head
, node
) {
431 void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
433 if (!event_notifier_enabler
) {
437 cds_list_del(&event_notifier_enabler
->node
);
439 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
441 free(event_notifier_enabler
);
445 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
446 struct lttng_session
*session
)
448 const char *enum_name
= desc
->name
;
449 struct lttng_enum
*_enum
;
450 struct cds_hlist_head
*head
;
452 size_t name_len
= strlen(enum_name
);
456 /* Check if this enum is already registered for this session. */
457 hash
= jhash(enum_name
, name_len
, 0);
458 head
= &session
->priv
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
460 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
466 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
467 if (notify_socket
< 0) {
472 _enum
= zmalloc(sizeof(*_enum
));
477 _enum
->session
= session
;
480 ret
= ustcomm_register_enum(notify_socket
,
487 DBG("Error (%d) registering enumeration to sessiond", ret
);
488 goto sessiond_register_error
;
490 cds_list_add(&_enum
->node
, &session
->priv
->enums_head
);
491 cds_hlist_add_head(&_enum
->hlist
, head
);
494 sessiond_register_error
:
503 int lttng_create_enum_check(const struct lttng_type
*type
,
504 struct lttng_session
*session
)
506 switch (type
->atype
) {
509 const struct lttng_enum_desc
*enum_desc
;
512 enum_desc
= type
->u
.legacy
.basic
.enumeration
.desc
;
513 ret
= lttng_enum_create(enum_desc
, session
);
514 if (ret
&& ret
!= -EEXIST
) {
515 DBG("Unable to create enum error: (%d)", ret
);
520 case atype_enum_nestable
:
522 const struct lttng_enum_desc
*enum_desc
;
525 enum_desc
= type
->u
.enum_nestable
.desc
;
526 ret
= lttng_enum_create(enum_desc
, session
);
527 if (ret
&& ret
!= -EEXIST
) {
528 DBG("Unable to create enum error: (%d)", ret
);
535 const struct lttng_event_field
*tag_field_generic
;
536 const struct lttng_enum_desc
*enum_desc
;
539 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
540 enum_desc
= tag_field_generic
->type
.u
.enum_nestable
.desc
;
541 ret
= lttng_enum_create(enum_desc
, session
);
542 if (ret
&& ret
!= -EEXIST
) {
543 DBG("Unable to create enum error: (%d)", ret
);
549 /* TODO: nested types when they become supported. */
556 int lttng_create_all_event_enums(size_t nr_fields
,
557 const struct lttng_event_field
*event_fields
,
558 struct lttng_session
*session
)
563 /* For each field, ensure enum is part of the session. */
564 for (i
= 0; i
< nr_fields
; i
++) {
565 const struct lttng_type
*type
= &event_fields
[i
].type
;
567 ret
= lttng_create_enum_check(type
, session
);
575 int lttng_create_all_ctx_enums(size_t nr_fields
,
576 const struct lttng_ctx_field
*ctx_fields
,
577 struct lttng_session
*session
)
582 /* For each field, ensure enum is part of the session. */
583 for (i
= 0; i
< nr_fields
; i
++) {
584 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
586 ret
= lttng_create_enum_check(type
, session
);
594 * Ensure that a state-dump will be performed for this session at the end
595 * of the current handle_message().
597 int lttng_session_statedump(struct lttng_session
*session
)
599 session
->priv
->statedump_pending
= 1;
600 lttng_ust_sockinfo_session_enabled(session
->priv
->owner
);
604 int lttng_session_enable(struct lttng_session
*session
)
607 struct lttng_channel
*chan
;
610 if (session
->active
) {
615 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
616 if (notify_socket
< 0)
617 return notify_socket
;
619 /* Set transient enabler state to "enabled" */
620 session
->priv
->tstate
= 1;
622 /* We need to sync enablers with session before activation. */
623 lttng_session_sync_event_enablers(session
);
626 * Snapshot the number of events per channel to know the type of header
629 cds_list_for_each_entry(chan
, &session
->priv
->chan_head
, node
) {
630 const struct lttng_ctx
*ctx
;
631 const struct lttng_ctx_field
*fields
= NULL
;
632 size_t nr_fields
= 0;
635 /* don't change it if session stop/restart */
636 if (chan
->header_type
)
640 nr_fields
= ctx
->nr_fields
;
641 fields
= ctx
->fields
;
642 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
645 DBG("Error (%d) adding enum to session", ret
);
649 ret
= ustcomm_register_channel(notify_socket
,
658 DBG("Error (%d) registering channel to sessiond", ret
);
661 if (chan_id
!= chan
->id
) {
662 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
668 /* Set atomically the state to "active" */
669 CMM_ACCESS_ONCE(session
->active
) = 1;
670 CMM_ACCESS_ONCE(session
->priv
->been_active
) = 1;
672 ret
= lttng_session_statedump(session
);
679 int lttng_session_disable(struct lttng_session
*session
)
683 if (!session
->active
) {
687 /* Set atomically the state to "inactive" */
688 CMM_ACCESS_ONCE(session
->active
) = 0;
690 /* Set transient enabler state to "disabled" */
691 session
->priv
->tstate
= 0;
692 lttng_session_sync_event_enablers(session
);
697 int lttng_channel_enable(struct lttng_channel
*channel
)
701 if (channel
->enabled
) {
705 /* Set transient enabler state to "enabled" */
707 lttng_session_sync_event_enablers(channel
->session
);
708 /* Set atomically the state to "enabled" */
709 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
714 int lttng_channel_disable(struct lttng_channel
*channel
)
718 if (!channel
->enabled
) {
722 /* Set atomically the state to "disabled" */
723 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
724 /* Set transient enabler state to "enabled" */
726 lttng_session_sync_event_enablers(channel
->session
);
732 struct cds_hlist_head
*borrow_hash_table_bucket(
733 struct cds_hlist_head
*hash_table
,
734 unsigned int hash_table_size
,
735 const struct lttng_event_desc
*desc
)
737 const char *event_name
;
741 event_name
= desc
->name
;
742 name_len
= strlen(event_name
);
744 hash
= jhash(event_name
, name_len
, 0);
745 return &hash_table
[hash
& (hash_table_size
- 1)];
749 * Supports event creation while tracing session is active.
752 int lttng_event_create(const struct lttng_event_desc
*desc
,
753 struct lttng_channel
*chan
)
755 struct lttng_event
*event
;
756 struct lttng_ust_event_private
*event_priv
;
757 struct lttng_session
*session
= chan
->session
;
758 struct cds_hlist_head
*head
;
760 int notify_socket
, loglevel
;
763 head
= borrow_hash_table_bucket(chan
->session
->priv
->events_ht
.table
,
764 LTTNG_UST_EVENT_HT_SIZE
, desc
);
766 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
767 if (notify_socket
< 0) {
772 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
775 DBG("Error (%d) adding enum to session", ret
);
776 goto create_enum_error
;
780 * Check if loglevel match. Refuse to connect event if not.
782 event
= zmalloc(sizeof(struct lttng_event
));
787 event_priv
= zmalloc(sizeof(struct lttng_ust_event_private
));
792 event
->priv
= event_priv
;
793 event_priv
->pub
= event
;
796 /* Event will be enabled by enabler sync. */
798 event
->priv
->registered
= 0;
799 CDS_INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
800 CDS_INIT_LIST_HEAD(&event
->priv
->enablers_ref_head
);
801 event
->priv
->desc
= desc
;
804 loglevel
= *(*event
->priv
->desc
->loglevel
);
806 loglevel
= TRACE_DEFAULT
;
807 if (desc
->u
.ext
.model_emf_uri
)
808 uri
= *(desc
->u
.ext
.model_emf_uri
);
812 /* Fetch event ID from sessiond */
813 ret
= ustcomm_register_event(notify_socket
,
825 DBG("Error (%d) registering event to sessiond", ret
);
826 goto sessiond_register_error
;
829 cds_list_add(&event
->priv
->node
, &chan
->session
->priv
->events_head
);
830 cds_hlist_add_head(&event
->priv
->hlist
, head
);
833 sessiond_register_error
:
844 int lttng_event_notifier_create(const struct lttng_event_desc
*desc
,
845 uint64_t token
, uint64_t error_counter_index
,
846 struct lttng_event_notifier_group
*event_notifier_group
)
848 struct lttng_event_notifier
*event_notifier
;
849 struct cds_hlist_head
*head
;
853 * Get the hashtable bucket the created lttng_event_notifier object
854 * should be inserted.
856 head
= borrow_hash_table_bucket(
857 event_notifier_group
->event_notifiers_ht
.table
,
858 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
860 event_notifier
= zmalloc(sizeof(struct lttng_event_notifier
));
861 if (!event_notifier
) {
866 event_notifier
->group
= event_notifier_group
;
867 event_notifier
->user_token
= token
;
868 event_notifier
->error_counter_index
= error_counter_index
;
870 /* Event notifier will be enabled by enabler sync. */
871 event_notifier
->enabled
= 0;
872 event_notifier
->registered
= 0;
874 CDS_INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
875 CDS_INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
876 CDS_INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
877 event_notifier
->desc
= desc
;
878 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
880 cds_list_add(&event_notifier
->node
,
881 &event_notifier_group
->event_notifiers_head
);
882 cds_hlist_add_head(&event_notifier
->hlist
, head
);
891 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
893 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
895 /* Remove from event_notifier list. */
896 cds_list_del(&event_notifier
->node
);
897 /* Remove from event_notifier hash table. */
898 cds_hlist_del(&event_notifier
->hlist
);
900 lttng_free_event_notifier_filter_runtime(event_notifier
);
902 /* Free event_notifier enabler refs */
903 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
904 &event_notifier
->enablers_ref_head
, node
)
906 free(event_notifier
);
910 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
911 struct lttng_enabler
*enabler
)
914 unsigned int has_loglevel
= 0;
916 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
917 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
918 desc
->name
, SIZE_MAX
))
920 if (desc
->loglevel
) {
921 loglevel
= *(*desc
->loglevel
);
924 if (!lttng_loglevel_match(loglevel
,
926 enabler
->event_param
.loglevel_type
,
927 enabler
->event_param
.loglevel
))
933 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
934 struct lttng_enabler
*enabler
)
937 unsigned int has_loglevel
= 0;
939 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
940 if (strcmp(desc
->name
, enabler
->event_param
.name
))
942 if (desc
->loglevel
) {
943 loglevel
= *(*desc
->loglevel
);
946 if (!lttng_loglevel_match(loglevel
,
948 enabler
->event_param
.loglevel_type
,
949 enabler
->event_param
.loglevel
))
955 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
956 struct lttng_enabler
*enabler
)
958 switch (enabler
->format_type
) {
959 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
961 struct lttng_ust_excluder_node
*excluder
;
963 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
968 * If the matching event matches with an excluder,
969 * return 'does not match'
971 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
974 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
978 excluder_name
= (char *) (excluder
->excluder
.names
)
979 + count
* LTTNG_UST_SYM_NAME_LEN
;
980 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
981 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
987 case LTTNG_ENABLER_FORMAT_EVENT
:
988 return lttng_desc_match_event_enabler(desc
, enabler
);
995 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
996 struct lttng_event
*event
)
998 if (lttng_desc_match_enabler(event
->priv
->desc
,
999 lttng_event_enabler_as_enabler(event_enabler
))
1000 && event
->chan
== event_enabler
->chan
)
1007 int lttng_event_notifier_enabler_match_event_notifier(
1008 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1009 struct lttng_event_notifier
*event_notifier
)
1011 int desc_matches
= lttng_desc_match_enabler(event_notifier
->desc
,
1012 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1014 if (desc_matches
&& event_notifier
->group
== event_notifier_enabler
->group
&&
1015 event_notifier
->user_token
== event_notifier_enabler
->user_token
)
1022 struct lttng_enabler_ref
*lttng_enabler_ref(
1023 struct cds_list_head
*enabler_ref_list
,
1024 struct lttng_enabler
*enabler
)
1026 struct lttng_enabler_ref
*enabler_ref
;
1028 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
1029 if (enabler_ref
->ref
== enabler
)
1036 * Create struct lttng_event if it is missing and present in the list of
1037 * tracepoint probes.
1040 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1042 struct lttng_session
*session
= event_enabler
->chan
->session
;
1043 struct lttng_probe_desc
*probe_desc
;
1044 const struct lttng_event_desc
*desc
;
1045 struct lttng_ust_event_private
*event_priv
;
1047 struct cds_list_head
*probe_list
;
1049 probe_list
= lttng_get_probe_list_head();
1051 * For each probe event, if we find that a probe event matches
1052 * our enabler, create an associated lttng_event if not
1055 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1056 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1059 struct cds_hlist_head
*head
;
1060 struct cds_hlist_node
*node
;
1062 desc
= probe_desc
->event_desc
[i
];
1063 if (!lttng_desc_match_enabler(desc
,
1064 lttng_event_enabler_as_enabler(event_enabler
)))
1067 head
= borrow_hash_table_bucket(
1068 session
->priv
->events_ht
.table
,
1069 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1071 cds_hlist_for_each_entry(event_priv
, node
, head
, hlist
) {
1072 if (event_priv
->desc
== desc
1073 && event_priv
->pub
->chan
== event_enabler
->chan
) {
1082 * We need to create an event for this
1085 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
1086 event_enabler
->chan
);
1088 DBG("Unable to create event %s, error %d\n",
1089 probe_desc
->event_desc
[i
]->name
, ret
);
1096 void probe_provider_event_for_each(struct lttng_probe_desc
*provider_desc
,
1097 void (*event_func
)(struct lttng_session
*session
,
1098 struct lttng_event
*event
),
1099 void (*event_notifier_func
)(struct lttng_event_notifier
*event_notifier
))
1101 struct cds_hlist_node
*node
, *tmp_node
;
1102 struct cds_list_head
*sessionsp
;
1105 /* Get handle on list of sessions. */
1106 sessionsp
= lttng_get_sessions();
1109 * Iterate over all events in the probe provider descriptions and
1110 * sessions to queue the unregistration of the events.
1112 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
1113 const struct lttng_event_desc
*event_desc
;
1114 struct lttng_event_notifier_group
*event_notifier_group
;
1115 struct lttng_event_notifier
*event_notifier
;
1116 struct lttng_ust_session_private
*session_priv
;
1117 struct cds_hlist_head
*head
;
1118 struct lttng_ust_event_private
*event_priv
;
1120 event_desc
= provider_desc
->event_desc
[i
];
1123 * Iterate over all session to find the current event
1126 cds_list_for_each_entry(session_priv
, sessionsp
, node
) {
1128 * Get the list of events in the hashtable bucket and
1129 * iterate to find the event matching this descriptor.
1131 head
= borrow_hash_table_bucket(
1132 session_priv
->events_ht
.table
,
1133 LTTNG_UST_EVENT_HT_SIZE
, event_desc
);
1135 cds_hlist_for_each_entry_safe(event_priv
, node
, tmp_node
, head
, hlist
) {
1136 if (event_desc
== event_priv
->desc
) {
1137 event_func(session_priv
->pub
, event_priv
->pub
);
1144 * Iterate over all event_notifier groups to find the current event
1147 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1149 * Get the list of event_notifiers in the hashtable bucket and
1150 * iterate to find the event_notifier matching this
1153 head
= borrow_hash_table_bucket(
1154 event_notifier_group
->event_notifiers_ht
.table
,
1155 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, event_desc
);
1157 cds_hlist_for_each_entry_safe(event_notifier
, node
, tmp_node
, head
, hlist
) {
1158 if (event_desc
== event_notifier
->desc
) {
1159 event_notifier_func(event_notifier
);
1168 void _unregister_event(struct lttng_session
*session
,
1169 struct lttng_event
*event
)
1171 _lttng_event_unregister(event
);
1175 void _event_enum_destroy(struct lttng_session
*session
,
1176 struct lttng_event
*event
)
1180 /* Destroy enums of the current event. */
1181 for (i
= 0; i
< event
->priv
->desc
->nr_fields
; i
++) {
1182 const struct lttng_enum_desc
*enum_desc
;
1183 const struct lttng_event_field
*field
;
1184 struct lttng_enum
*curr_enum
;
1186 field
= &(event
->priv
->desc
->fields
[i
]);
1187 switch (field
->type
.atype
) {
1189 enum_desc
= field
->type
.u
.legacy
.basic
.enumeration
.desc
;
1191 case atype_enum_nestable
:
1192 enum_desc
= field
->type
.u
.enum_nestable
.desc
;
1198 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1200 _lttng_enum_destroy(curr_enum
);
1204 /* Destroy event. */
1205 _lttng_event_destroy(event
);
1209 * Iterate over all the UST sessions to unregister and destroy all probes from
1210 * the probe provider descriptor received as argument. Must me called with the
1213 void lttng_probe_provider_unregister_events(
1214 struct lttng_probe_desc
*provider_desc
)
1217 * Iterate over all events in the probe provider descriptions and sessions
1218 * to queue the unregistration of the events.
1220 probe_provider_event_for_each(provider_desc
, _unregister_event
,
1221 _lttng_event_notifier_unregister
);
1223 /* Wait for grace period. */
1224 lttng_ust_urcu_synchronize_rcu();
1225 /* Prune the unregistration queue. */
1226 __tracepoint_probe_prune_release_queue();
1229 * It is now safe to destroy the events and remove them from the event list
1232 probe_provider_event_for_each(provider_desc
, _event_enum_destroy
,
1233 _lttng_event_notifier_destroy
);
1237 * Create events associated with an event enabler (if not already present),
1238 * and add backward reference from the event to the enabler.
1241 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1243 struct lttng_session
*session
= event_enabler
->chan
->session
;
1244 struct lttng_ust_event_private
*event_priv
;
1246 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1249 /* First ensure that probe events are created for this enabler. */
1250 lttng_create_event_if_missing(event_enabler
);
1252 /* For each event matching enabler in session event list. */
1253 cds_list_for_each_entry(event_priv
, &session
->priv
->events_head
, node
) {
1254 struct lttng_enabler_ref
*enabler_ref
;
1256 if (!lttng_event_enabler_match_event(event_enabler
, event_priv
->pub
))
1259 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
,
1260 lttng_event_enabler_as_enabler(event_enabler
));
1263 * If no backward ref, create it.
1264 * Add backward ref from event to enabler.
1266 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1269 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1271 cds_list_add(&enabler_ref
->node
,
1272 &event_priv
->enablers_ref_head
);
1276 * Link filter bytecodes if not linked yet.
1278 lttng_enabler_link_bytecode(event_priv
->desc
,
1279 &session
->priv
->ctx
,
1280 &event_priv
->pub
->filter_bytecode_runtime_head
,
1281 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1283 /* TODO: merge event context. */
1290 * Called at library load: connect the probe on all enablers matching
1292 * Called with session mutex held.
1294 int lttng_fix_pending_events(void)
1296 struct lttng_ust_session_private
*session_priv
;
1298 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1299 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
1304 int lttng_fix_pending_event_notifiers(void)
1306 struct lttng_event_notifier_group
*event_notifier_group
;
1308 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1309 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1315 * For each session of the owner thread, execute pending statedump.
1316 * Only dump state for the sessions owned by the caller thread, because
1317 * we don't keep ust_lock across the entire iteration.
1319 void lttng_handle_pending_statedump(void *owner
)
1321 struct lttng_ust_session_private
*session_priv
;
1323 /* Execute state dump */
1324 do_lttng_ust_statedump(owner
);
1326 /* Clear pending state dump */
1330 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1331 if (session_priv
->owner
!= owner
)
1333 if (!session_priv
->statedump_pending
)
1335 session_priv
->statedump_pending
= 0;
1343 * Only used internally at session destruction.
1346 void _lttng_event_destroy(struct lttng_event
*event
)
1348 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1350 /* Remove from event list. */
1351 cds_list_del(&event
->priv
->node
);
1352 /* Remove from event hash table. */
1353 cds_hlist_del(&event
->priv
->hlist
);
1355 lttng_destroy_context(event
->ctx
);
1356 lttng_free_event_filter_runtime(event
);
1357 /* Free event enabler refs */
1358 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1359 &event
->priv
->enablers_ref_head
, node
)
1366 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1368 cds_list_del(&_enum
->node
);
1369 cds_hlist_del(&_enum
->hlist
);
1373 void lttng_ust_events_exit(void)
1375 struct lttng_ust_session_private
*session_priv
, *tmpsession_priv
;
1377 cds_list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, node
)
1378 lttng_session_destroy(session_priv
->pub
);
1382 * Enabler management.
1384 struct lttng_event_enabler
*lttng_event_enabler_create(
1385 enum lttng_enabler_format_type format_type
,
1386 struct lttng_ust_event
*event_param
,
1387 struct lttng_channel
*chan
)
1389 struct lttng_event_enabler
*event_enabler
;
1391 event_enabler
= zmalloc(sizeof(*event_enabler
));
1394 event_enabler
->base
.format_type
= format_type
;
1395 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1396 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1397 memcpy(&event_enabler
->base
.event_param
, event_param
,
1398 sizeof(event_enabler
->base
.event_param
));
1399 event_enabler
->chan
= chan
;
1401 event_enabler
->base
.enabled
= 0;
1402 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->priv
->enablers_head
);
1403 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1405 return event_enabler
;
1408 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1409 struct lttng_event_notifier_group
*event_notifier_group
,
1410 enum lttng_enabler_format_type format_type
,
1411 struct lttng_ust_event_notifier
*event_notifier_param
)
1413 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1415 event_notifier_enabler
= zmalloc(sizeof(*event_notifier_enabler
));
1416 if (!event_notifier_enabler
)
1418 event_notifier_enabler
->base
.format_type
= format_type
;
1419 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1420 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
1421 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.excluder_head
);
1423 event_notifier_enabler
->user_token
= event_notifier_param
->event
.token
;
1424 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
1425 event_notifier_enabler
->num_captures
= 0;
1427 memcpy(&event_notifier_enabler
->base
.event_param
.name
,
1428 event_notifier_param
->event
.name
,
1429 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1430 event_notifier_enabler
->base
.event_param
.instrumentation
=
1431 event_notifier_param
->event
.instrumentation
;
1432 event_notifier_enabler
->base
.event_param
.loglevel
=
1433 event_notifier_param
->event
.loglevel
;
1434 event_notifier_enabler
->base
.event_param
.loglevel_type
=
1435 event_notifier_param
->event
.loglevel_type
;
1437 event_notifier_enabler
->base
.enabled
= 0;
1438 event_notifier_enabler
->group
= event_notifier_group
;
1440 cds_list_add(&event_notifier_enabler
->node
,
1441 &event_notifier_group
->enablers_head
);
1443 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1445 return event_notifier_enabler
;
1448 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1450 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1451 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1456 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1458 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1459 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1465 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1466 struct lttng_ust_bytecode_node
**bytecode
)
1468 (*bytecode
)->enabler
= enabler
;
1469 cds_list_add_tail(&(*bytecode
)->node
, &enabler
->filter_bytecode_head
);
1470 /* Take ownership of bytecode */
1474 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1475 struct lttng_ust_bytecode_node
**bytecode
)
1477 _lttng_enabler_attach_filter_bytecode(
1478 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1480 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1485 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1486 struct lttng_ust_excluder_node
**excluder
)
1488 (*excluder
)->enabler
= enabler
;
1489 cds_list_add_tail(&(*excluder
)->node
, &enabler
->excluder_head
);
1490 /* Take ownership of excluder */
1494 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1495 struct lttng_ust_excluder_node
**excluder
)
1497 _lttng_enabler_attach_exclusion(
1498 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1500 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1504 int lttng_event_notifier_enabler_enable(
1505 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1507 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
1508 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1513 int lttng_event_notifier_enabler_disable(
1514 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1516 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
1517 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1522 int lttng_event_notifier_enabler_attach_filter_bytecode(
1523 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1524 struct lttng_ust_bytecode_node
**bytecode
)
1526 _lttng_enabler_attach_filter_bytecode(
1527 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1530 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1534 int lttng_event_notifier_enabler_attach_capture_bytecode(
1535 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1536 struct lttng_ust_bytecode_node
**bytecode
)
1538 (*bytecode
)->enabler
= lttng_event_notifier_enabler_as_enabler(
1539 event_notifier_enabler
);
1540 cds_list_add_tail(&(*bytecode
)->node
,
1541 &event_notifier_enabler
->capture_bytecode_head
);
1542 /* Take ownership of bytecode */
1544 event_notifier_enabler
->num_captures
++;
1546 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1550 int lttng_event_notifier_enabler_attach_exclusion(
1551 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1552 struct lttng_ust_excluder_node
**excluder
)
1554 _lttng_enabler_attach_exclusion(
1555 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1558 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1562 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1563 union ust_args
*uargs
,
1564 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1567 * We cannot attach a context after trace has been started for a
1568 * session because the metadata does not allow expressing this
1569 * information outside of the original channel scope.
1571 if (session
->priv
->been_active
)
1574 switch (context_param
->ctx
) {
1575 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1576 return lttng_add_pthread_id_to_ctx(ctx
);
1577 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1579 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1581 perf_ctx_param
= &context_param
->u
.perf_counter
;
1582 return lttng_add_perf_counter_to_ctx(
1583 perf_ctx_param
->type
,
1584 perf_ctx_param
->config
,
1585 perf_ctx_param
->name
,
1588 case LTTNG_UST_CONTEXT_VTID
:
1589 return lttng_add_vtid_to_ctx(ctx
);
1590 case LTTNG_UST_CONTEXT_VPID
:
1591 return lttng_add_vpid_to_ctx(ctx
);
1592 case LTTNG_UST_CONTEXT_PROCNAME
:
1593 return lttng_add_procname_to_ctx(ctx
);
1594 case LTTNG_UST_CONTEXT_IP
:
1595 return lttng_add_ip_to_ctx(ctx
);
1596 case LTTNG_UST_CONTEXT_CPU_ID
:
1597 return lttng_add_cpu_id_to_ctx(ctx
);
1598 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1599 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1601 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1602 return lttng_add_cgroup_ns_to_ctx(ctx
);
1603 case LTTNG_UST_CONTEXT_IPC_NS
:
1604 return lttng_add_ipc_ns_to_ctx(ctx
);
1605 case LTTNG_UST_CONTEXT_MNT_NS
:
1606 return lttng_add_mnt_ns_to_ctx(ctx
);
1607 case LTTNG_UST_CONTEXT_NET_NS
:
1608 return lttng_add_net_ns_to_ctx(ctx
);
1609 case LTTNG_UST_CONTEXT_PID_NS
:
1610 return lttng_add_pid_ns_to_ctx(ctx
);
1611 case LTTNG_UST_CONTEXT_TIME_NS
:
1612 return lttng_add_time_ns_to_ctx(ctx
);
1613 case LTTNG_UST_CONTEXT_USER_NS
:
1614 return lttng_add_user_ns_to_ctx(ctx
);
1615 case LTTNG_UST_CONTEXT_UTS_NS
:
1616 return lttng_add_uts_ns_to_ctx(ctx
);
1617 case LTTNG_UST_CONTEXT_VUID
:
1618 return lttng_add_vuid_to_ctx(ctx
);
1619 case LTTNG_UST_CONTEXT_VEUID
:
1620 return lttng_add_veuid_to_ctx(ctx
);
1621 case LTTNG_UST_CONTEXT_VSUID
:
1622 return lttng_add_vsuid_to_ctx(ctx
);
1623 case LTTNG_UST_CONTEXT_VGID
:
1624 return lttng_add_vgid_to_ctx(ctx
);
1625 case LTTNG_UST_CONTEXT_VEGID
:
1626 return lttng_add_vegid_to_ctx(ctx
);
1627 case LTTNG_UST_CONTEXT_VSGID
:
1628 return lttng_add_vsgid_to_ctx(ctx
);
1634 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*enabler
,
1635 struct lttng_ust_context
*context_param
)
1640 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1642 if (!event_enabler
) {
1645 cds_list_del(&event_enabler
->node
);
1647 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1649 lttng_destroy_context(event_enabler
->ctx
);
1650 free(event_enabler
);
1654 * lttng_session_sync_event_enablers should be called just before starting a
1658 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
1660 struct lttng_event_enabler
*event_enabler
;
1661 struct lttng_ust_event_private
*event_priv
;
1663 cds_list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
1664 lttng_event_enabler_ref_events(event_enabler
);
1666 * For each event, if at least one of its enablers is enabled,
1667 * and its channel and session transient states are enabled, we
1668 * enable the event, else we disable it.
1670 cds_list_for_each_entry(event_priv
, &session
->priv
->events_head
, node
) {
1671 struct lttng_enabler_ref
*enabler_ref
;
1672 struct lttng_bytecode_runtime
*runtime
;
1673 int enabled
= 0, has_enablers_without_bytecode
= 0;
1676 cds_list_for_each_entry(enabler_ref
,
1677 &event_priv
->enablers_ref_head
, node
) {
1678 if (enabler_ref
->ref
->enabled
) {
1684 * Enabled state is based on union of enablers, with
1685 * intesection of session and channel transient enable
1688 enabled
= enabled
&& session
->priv
->tstate
&& event_priv
->pub
->chan
->tstate
;
1690 CMM_STORE_SHARED(event_priv
->pub
->enabled
, enabled
);
1692 * Sync tracepoint registration with event enabled
1696 if (!event_priv
->registered
)
1697 register_event(event_priv
->pub
);
1699 if (event_priv
->registered
)
1700 unregister_event(event_priv
->pub
);
1703 /* Check if has enablers without bytecode enabled */
1704 cds_list_for_each_entry(enabler_ref
,
1705 &event_priv
->enablers_ref_head
, node
) {
1706 if (enabler_ref
->ref
->enabled
1707 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1708 has_enablers_without_bytecode
= 1;
1712 event_priv
->pub
->has_enablers_without_bytecode
=
1713 has_enablers_without_bytecode
;
1715 /* Enable filters */
1716 cds_list_for_each_entry(runtime
,
1717 &event_priv
->pub
->filter_bytecode_runtime_head
, node
) {
1718 lttng_bytecode_filter_sync_state(runtime
);
1721 __tracepoint_probe_prune_release_queue();
1724 /* Support for event notifier is introduced by probe provider major version 2. */
1726 bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc
*probe_desc
)
1728 return probe_desc
->major
>= 2;
1732 void lttng_create_event_notifier_if_missing(
1733 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1735 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1736 struct lttng_probe_desc
*probe_desc
;
1737 struct cds_list_head
*probe_list
;
1740 probe_list
= lttng_get_probe_list_head();
1742 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1743 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1746 const struct lttng_event_desc
*desc
;
1747 struct lttng_event_notifier
*event_notifier
;
1748 struct cds_hlist_head
*head
;
1749 struct cds_hlist_node
*node
;
1751 desc
= probe_desc
->event_desc
[i
];
1753 if (!lttng_desc_match_enabler(desc
,
1754 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1758 * Given the current event_notifier group, get the bucket that
1759 * the target event_notifier would be if it was already
1762 head
= borrow_hash_table_bucket(
1763 event_notifier_group
->event_notifiers_ht
.table
,
1764 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
1766 cds_hlist_for_each_entry(event_notifier
, node
, head
, hlist
) {
1768 * Check if event_notifier already exists by checking
1769 * if the event_notifier and enabler share the same
1770 * description and id.
1772 if (event_notifier
->desc
== desc
&&
1773 event_notifier
->user_token
== event_notifier_enabler
->user_token
) {
1782 /* Check that the probe supports event notifiers, else report the error. */
1783 if (!lttng_ust_probe_supports_event_notifier(probe_desc
)) {
1784 ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, "
1785 "but its version (%u.%u) is too old and does not implement event notifiers. "
1786 "It needs to be recompiled against a newer version of LTTng-UST, otherwise "
1787 "this event will not generate any notification.",
1788 probe_desc
->provider
,
1795 * We need to create a event_notifier for this event probe.
1797 ret
= lttng_event_notifier_create(desc
,
1798 event_notifier_enabler
->user_token
,
1799 event_notifier_enabler
->error_counter_index
,
1800 event_notifier_group
);
1802 DBG("Unable to create event_notifier %s, error %d\n",
1803 probe_desc
->event_desc
[i
]->name
, ret
);
1810 * Create event_notifiers associated with a event_notifier enabler (if not already present).
1813 int lttng_event_notifier_enabler_ref_event_notifiers(
1814 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1816 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1817 struct lttng_event_notifier
*event_notifier
;
1820 * Only try to create event_notifiers for enablers that are enabled, the user
1821 * might still be attaching filter or exclusion to the
1822 * event_notifier_enabler.
1824 if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
)
1827 /* First, ensure that probe event_notifiers are created for this enabler. */
1828 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
1830 /* Link the created event_notifier with its associated enabler. */
1831 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1832 struct lttng_enabler_ref
*enabler_ref
;
1834 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
1837 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
1838 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1841 * If no backward ref, create it.
1842 * Add backward ref from event_notifier to enabler.
1844 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1848 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
1849 event_notifier_enabler
);
1850 cds_list_add(&enabler_ref
->node
,
1851 &event_notifier
->enablers_ref_head
);
1855 * Link filter bytecodes if not linked yet.
1857 lttng_enabler_link_bytecode(event_notifier
->desc
,
1858 &event_notifier_group
->ctx
,
1859 &event_notifier
->filter_bytecode_runtime_head
,
1860 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
1863 * Link capture bytecodes if not linked yet.
1865 lttng_enabler_link_bytecode(event_notifier
->desc
,
1866 &event_notifier_group
->ctx
, &event_notifier
->capture_bytecode_runtime_head
,
1867 &event_notifier_enabler
->capture_bytecode_head
);
1869 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
1876 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
1878 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1879 struct lttng_event_notifier
*event_notifier
;
1881 cds_list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
1882 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
1885 * For each event_notifier, if at least one of its enablers is enabled,
1886 * we enable the event_notifier, else we disable it.
1888 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1889 struct lttng_enabler_ref
*enabler_ref
;
1890 struct lttng_bytecode_runtime
*runtime
;
1891 int enabled
= 0, has_enablers_without_bytecode
= 0;
1893 /* Enable event_notifiers */
1894 cds_list_for_each_entry(enabler_ref
,
1895 &event_notifier
->enablers_ref_head
, node
) {
1896 if (enabler_ref
->ref
->enabled
) {
1902 CMM_STORE_SHARED(event_notifier
->enabled
, enabled
);
1904 * Sync tracepoint registration with event_notifier enabled
1908 if (!event_notifier
->registered
)
1909 register_event_notifier(event_notifier
);
1911 if (event_notifier
->registered
)
1912 unregister_event_notifier(event_notifier
);
1915 /* Check if has enablers without bytecode enabled */
1916 cds_list_for_each_entry(enabler_ref
,
1917 &event_notifier
->enablers_ref_head
, node
) {
1918 if (enabler_ref
->ref
->enabled
1919 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1920 has_enablers_without_bytecode
= 1;
1924 event_notifier
->has_enablers_without_bytecode
=
1925 has_enablers_without_bytecode
;
1927 /* Enable filters */
1928 cds_list_for_each_entry(runtime
,
1929 &event_notifier
->filter_bytecode_runtime_head
, node
) {
1930 lttng_bytecode_filter_sync_state(runtime
);
1933 /* Enable captures. */
1934 cds_list_for_each_entry(runtime
,
1935 &event_notifier
->capture_bytecode_runtime_head
, node
) {
1936 lttng_bytecode_capture_sync_state(runtime
);
1939 __tracepoint_probe_prune_release_queue();
1943 * Apply enablers to session events, adding events to session if need
1944 * be. It is required after each modification applied to an active
1945 * session, and right before session "start".
1946 * "lazy" sync means we only sync if required.
1949 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
1951 /* We can skip if session is not active */
1952 if (!session
->active
)
1954 lttng_session_sync_event_enablers(session
);
1958 * Update all sessions with the given app context.
1959 * Called with ust lock held.
1960 * This is invoked when an application context gets loaded/unloaded. It
1961 * ensures the context callbacks are in sync with the application
1962 * context (either app context callbacks, or dummy callbacks).
1964 void lttng_ust_context_set_session_provider(const char *name
,
1965 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1966 void (*record
)(struct lttng_ctx_field
*field
,
1967 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1968 struct lttng_channel
*chan
),
1969 void (*get_value
)(struct lttng_ctx_field
*field
,
1970 struct lttng_ctx_value
*value
))
1972 struct lttng_ust_session_private
*session_priv
;
1974 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1975 struct lttng_channel
*chan
;
1976 struct lttng_ust_event_private
*event_priv
;
1979 ret
= lttng_ust_context_set_provider_rcu(&session_priv
->ctx
,
1980 name
, get_size
, record
, get_value
);
1983 cds_list_for_each_entry(chan
, &session_priv
->chan_head
, node
) {
1984 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1985 name
, get_size
, record
, get_value
);
1989 cds_list_for_each_entry(event_priv
, &session_priv
->events_head
, node
) {
1990 ret
= lttng_ust_context_set_provider_rcu(&event_priv
->pub
->ctx
,
1991 name
, get_size
, record
, get_value
);
1999 * Update all event_notifier groups with the given app context.
2000 * Called with ust lock held.
2001 * This is invoked when an application context gets loaded/unloaded. It
2002 * ensures the context callbacks are in sync with the application
2003 * context (either app context callbacks, or dummy callbacks).
2005 void lttng_ust_context_set_event_notifier_group_provider(const char *name
,
2006 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
2007 void (*record
)(struct lttng_ctx_field
*field
,
2008 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
2009 struct lttng_channel
*chan
),
2010 void (*get_value
)(struct lttng_ctx_field
*field
,
2011 struct lttng_ctx_value
*value
))
2013 struct lttng_event_notifier_group
*event_notifier_group
;
2015 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2018 ret
= lttng_ust_context_set_provider_rcu(
2019 &event_notifier_group
->ctx
,
2020 name
, get_size
, record
, get_value
);