4 * Holds LTTng per-session event registry.
6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
38 #include <lttng/ust-endian.h>
40 #include <urcu/arch.h>
41 #include <urcu/compiler.h>
42 #include <urcu/hlist.h>
43 #include <urcu/list.h>
44 #include <urcu/uatomic.h>
46 #include <lttng/tracepoint.h>
47 #include <lttng/ust-events.h>
49 #include <usterr-signal-safe.h>
51 #include <lttng/ust-ctl.h>
54 #include <lttng/ust-dynamic-type.h>
55 #include <lttng/ust-context-provider.h>
58 #include "lttng-ust-uuid.h"
60 #include "tracepoint-internal.h"
61 #include "string-utils.h"
62 #include "lttng-bytecode.h"
63 #include "lttng-tracer.h"
64 #include "lttng-tracer-core.h"
65 #include "lttng-ust-statedump.h"
66 #include "context-internal.h"
67 #include "ust-events-internal.h"
69 #include "../libringbuffer/shm.h"
70 #include "../libcounter/counter.h"
72 #include <lttng/ust-abi.h>
75 * All operations within this file are called by the communication
76 * thread, under ust_lock protection.
79 static CDS_LIST_HEAD(sessions
);
80 static CDS_LIST_HEAD(event_notifier_groups
);
82 struct cds_list_head
*_lttng_get_sessions(void)
87 static void _lttng_event_destroy(struct lttng_event
*event
);
88 static void _lttng_event_notifier_destroy(
89 struct lttng_event_notifier
*event_notifier
);
90 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
93 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
95 void lttng_session_sync_event_enablers(struct lttng_session
*session
);
97 void lttng_event_notifier_group_sync_enablers(
98 struct lttng_event_notifier_group
*event_notifier_group
);
100 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
103 * Called with ust lock held.
105 int lttng_session_active(void)
107 struct lttng_session
*iter
;
109 cds_list_for_each_entry(iter
, &sessions
, node
) {
117 int lttng_loglevel_match(int loglevel
,
118 unsigned int has_loglevel
,
119 enum lttng_ust_loglevel_type req_type
,
123 loglevel
= TRACE_DEFAULT
;
125 case LTTNG_UST_LOGLEVEL_RANGE
:
126 if (loglevel
<= req_loglevel
127 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
131 case LTTNG_UST_LOGLEVEL_SINGLE
:
132 if (loglevel
== req_loglevel
133 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
137 case LTTNG_UST_LOGLEVEL_ALL
:
139 if (loglevel
<= TRACE_DEBUG
)
146 struct lttng_session
*lttng_session_create(void)
148 struct lttng_session
*session
;
151 session
= zmalloc(sizeof(struct lttng_session
));
154 if (lttng_context_init_all(&session
->ctx
)) {
158 CDS_INIT_LIST_HEAD(&session
->chan_head
);
159 CDS_INIT_LIST_HEAD(&session
->events_head
);
160 CDS_INIT_LIST_HEAD(&session
->enums_head
);
161 CDS_INIT_LIST_HEAD(&session
->enablers_head
);
162 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
163 CDS_INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
164 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
165 CDS_INIT_HLIST_HEAD(&session
->enums_ht
.table
[i
]);
166 cds_list_add(&session
->node
, &sessions
);
170 struct lttng_counter
*lttng_ust_counter_create(
171 const char *counter_transport_name
,
172 size_t number_dimensions
, const struct lttng_counter_dimension
*dimensions
)
174 struct lttng_counter_transport
*counter_transport
= NULL
;
175 struct lttng_counter
*counter
= NULL
;
177 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
178 if (!counter_transport
)
180 counter
= zmalloc(sizeof(struct lttng_counter
));
184 counter
->ops
= &counter_transport
->ops
;
185 counter
->transport
= counter_transport
;
187 counter
->counter
= counter
->ops
->counter_create(
188 number_dimensions
, dimensions
, 0,
190 if (!counter
->counter
) {
204 void lttng_ust_counter_destroy(struct lttng_counter
*counter
)
206 counter
->ops
->counter_destroy(counter
->counter
);
210 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
212 struct lttng_event_notifier_group
*event_notifier_group
;
215 event_notifier_group
= zmalloc(sizeof(struct lttng_event_notifier_group
));
216 if (!event_notifier_group
)
219 /* Add all contexts. */
220 if (lttng_context_init_all(&event_notifier_group
->ctx
)) {
221 free(event_notifier_group
);
225 CDS_INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
226 CDS_INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
227 for (i
= 0; i
< LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
; i
++)
228 CDS_INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
230 cds_list_add(&event_notifier_group
->node
, &event_notifier_groups
);
232 return event_notifier_group
;
236 * Only used internally at session destruction.
239 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
241 struct channel
*chan
;
242 struct lttng_ust_shm_handle
*handle
;
244 cds_list_del(<tng_chan
->node
);
245 lttng_destroy_context(lttng_chan
->ctx
);
246 chan
= lttng_chan
->chan
;
247 handle
= lttng_chan
->handle
;
249 * note: lttng_chan is private data contained within handle. It
250 * will be freed along with the handle.
252 channel_destroy(chan
, handle
, 0);
256 void register_event(struct lttng_event
*event
)
259 const struct lttng_event_desc
*desc
;
261 assert(event
->registered
== 0);
263 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
264 desc
->probe_callback
,
265 event
, desc
->signature
);
268 event
->registered
= 1;
272 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
275 const struct lttng_event_desc
*desc
;
277 assert(event_notifier
->registered
== 0);
278 desc
= event_notifier
->desc
;
279 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
280 desc
->u
.ext
.event_notifier_callback
, event_notifier
, desc
->signature
);
283 event_notifier
->registered
= 1;
287 void unregister_event(struct lttng_event
*event
)
290 const struct lttng_event_desc
*desc
;
292 assert(event
->registered
== 1);
294 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
295 desc
->probe_callback
,
299 event
->registered
= 0;
303 void unregister_event_notifier(struct lttng_event_notifier
*event_notifier
)
306 const struct lttng_event_desc
*desc
;
308 assert(event_notifier
->registered
== 1);
309 desc
= event_notifier
->desc
;
310 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
311 desc
->u
.ext
.event_notifier_callback
, event_notifier
);
314 event_notifier
->registered
= 0;
318 * Only used internally at session destruction.
321 void _lttng_event_unregister(struct lttng_event
*event
)
323 if (event
->registered
)
324 unregister_event(event
);
328 * Only used internally at session destruction.
331 void _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
)
333 if (event_notifier
->registered
)
334 unregister_event_notifier(event_notifier
);
337 void lttng_session_destroy(struct lttng_session
*session
)
339 struct lttng_channel
*chan
, *tmpchan
;
340 struct lttng_event
*event
, *tmpevent
;
341 struct lttng_enum
*_enum
, *tmp_enum
;
342 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
344 CMM_ACCESS_ONCE(session
->active
) = 0;
345 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
346 _lttng_event_unregister(event
);
348 lttng_ust_synchronize_trace(); /* Wait for in-flight events to complete */
349 __tracepoint_probe_prune_release_queue();
350 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
351 &session
->enablers_head
, node
)
352 lttng_event_enabler_destroy(event_enabler
);
353 cds_list_for_each_entry_safe(event
, tmpevent
,
354 &session
->events_head
, node
)
355 _lttng_event_destroy(event
);
356 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
357 &session
->enums_head
, node
)
358 _lttng_enum_destroy(_enum
);
359 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan_head
, node
)
360 _lttng_channel_unmap(chan
);
361 cds_list_del(&session
->node
);
362 lttng_destroy_context(session
->ctx
);
366 void lttng_event_notifier_group_destroy(
367 struct lttng_event_notifier_group
*event_notifier_group
)
370 struct lttng_event_notifier_enabler
*notifier_enabler
, *tmpnotifier_enabler
;
371 struct lttng_event_notifier
*notifier
, *tmpnotifier
;
373 if (!event_notifier_group
) {
377 cds_list_for_each_entry(notifier
,
378 &event_notifier_group
->event_notifiers_head
, node
)
379 _lttng_event_notifier_unregister(notifier
);
381 lttng_ust_synchronize_trace();
383 cds_list_for_each_entry_safe(notifier_enabler
, tmpnotifier_enabler
,
384 &event_notifier_group
->enablers_head
, node
)
385 lttng_event_notifier_enabler_destroy(notifier_enabler
);
387 cds_list_for_each_entry_safe(notifier
, tmpnotifier
,
388 &event_notifier_group
->event_notifiers_head
, node
)
389 _lttng_event_notifier_destroy(notifier
);
391 if (event_notifier_group
->error_counter
)
392 lttng_ust_counter_destroy(event_notifier_group
->error_counter
);
394 /* Close the notification fd to the listener of event_notifiers. */
396 lttng_ust_lock_fd_tracker();
397 close_ret
= close(event_notifier_group
->notification_fd
);
399 lttng_ust_delete_fd_from_tracker(
400 event_notifier_group
->notification_fd
);
405 lttng_ust_unlock_fd_tracker();
407 cds_list_del(&event_notifier_group
->node
);
409 free(event_notifier_group
);
413 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
415 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
416 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
422 /* Destroy filter bytecode */
423 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
424 &enabler
->filter_bytecode_head
, node
) {
428 /* Destroy excluders */
429 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
430 &enabler
->excluder_head
, node
) {
435 void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
437 if (!event_notifier_enabler
) {
441 cds_list_del(&event_notifier_enabler
->node
);
443 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
445 free(event_notifier_enabler
);
449 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
450 struct lttng_session
*session
)
452 const char *enum_name
= desc
->name
;
453 struct lttng_enum
*_enum
;
454 struct cds_hlist_head
*head
;
456 size_t name_len
= strlen(enum_name
);
460 /* Check if this enum is already registered for this session. */
461 hash
= jhash(enum_name
, name_len
, 0);
462 head
= &session
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
464 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
470 notify_socket
= lttng_get_notify_socket(session
->owner
);
471 if (notify_socket
< 0) {
476 _enum
= zmalloc(sizeof(*_enum
));
481 _enum
->session
= session
;
484 ret
= ustcomm_register_enum(notify_socket
,
491 DBG("Error (%d) registering enumeration to sessiond", ret
);
492 goto sessiond_register_error
;
494 cds_list_add(&_enum
->node
, &session
->enums_head
);
495 cds_hlist_add_head(&_enum
->hlist
, head
);
498 sessiond_register_error
:
507 int lttng_create_enum_check(const struct lttng_type
*type
,
508 struct lttng_session
*session
)
510 switch (type
->atype
) {
513 const struct lttng_enum_desc
*enum_desc
;
516 enum_desc
= type
->u
.legacy
.basic
.enumeration
.desc
;
517 ret
= lttng_enum_create(enum_desc
, session
);
518 if (ret
&& ret
!= -EEXIST
) {
519 DBG("Unable to create enum error: (%d)", ret
);
524 case atype_enum_nestable
:
526 const struct lttng_enum_desc
*enum_desc
;
529 enum_desc
= type
->u
.enum_nestable
.desc
;
530 ret
= lttng_enum_create(enum_desc
, session
);
531 if (ret
&& ret
!= -EEXIST
) {
532 DBG("Unable to create enum error: (%d)", ret
);
539 const struct lttng_event_field
*tag_field_generic
;
540 const struct lttng_enum_desc
*enum_desc
;
543 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
544 enum_desc
= tag_field_generic
->type
.u
.enum_nestable
.desc
;
545 ret
= lttng_enum_create(enum_desc
, session
);
546 if (ret
&& ret
!= -EEXIST
) {
547 DBG("Unable to create enum error: (%d)", ret
);
553 /* TODO: nested types when they become supported. */
560 int lttng_create_all_event_enums(size_t nr_fields
,
561 const struct lttng_event_field
*event_fields
,
562 struct lttng_session
*session
)
567 /* For each field, ensure enum is part of the session. */
568 for (i
= 0; i
< nr_fields
; i
++) {
569 const struct lttng_type
*type
= &event_fields
[i
].type
;
571 ret
= lttng_create_enum_check(type
, session
);
579 int lttng_create_all_ctx_enums(size_t nr_fields
,
580 const struct lttng_ctx_field
*ctx_fields
,
581 struct lttng_session
*session
)
586 /* For each field, ensure enum is part of the session. */
587 for (i
= 0; i
< nr_fields
; i
++) {
588 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
590 ret
= lttng_create_enum_check(type
, session
);
598 * Ensure that a state-dump will be performed for this session at the end
599 * of the current handle_message().
601 int lttng_session_statedump(struct lttng_session
*session
)
603 session
->statedump_pending
= 1;
604 lttng_ust_sockinfo_session_enabled(session
->owner
);
608 int lttng_session_enable(struct lttng_session
*session
)
611 struct lttng_channel
*chan
;
614 if (session
->active
) {
619 notify_socket
= lttng_get_notify_socket(session
->owner
);
620 if (notify_socket
< 0)
621 return notify_socket
;
623 /* Set transient enabler state to "enabled" */
626 /* We need to sync enablers with session before activation. */
627 lttng_session_sync_event_enablers(session
);
630 * Snapshot the number of events per channel to know the type of header
633 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
634 const struct lttng_ctx
*ctx
;
635 const struct lttng_ctx_field
*fields
= NULL
;
636 size_t nr_fields
= 0;
639 /* don't change it if session stop/restart */
640 if (chan
->header_type
)
644 nr_fields
= ctx
->nr_fields
;
645 fields
= ctx
->fields
;
646 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
649 DBG("Error (%d) adding enum to session", ret
);
653 ret
= ustcomm_register_channel(notify_socket
,
662 DBG("Error (%d) registering channel to sessiond", ret
);
665 if (chan_id
!= chan
->id
) {
666 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
672 /* Set atomically the state to "active" */
673 CMM_ACCESS_ONCE(session
->active
) = 1;
674 CMM_ACCESS_ONCE(session
->been_active
) = 1;
676 ret
= lttng_session_statedump(session
);
683 int lttng_session_disable(struct lttng_session
*session
)
687 if (!session
->active
) {
691 /* Set atomically the state to "inactive" */
692 CMM_ACCESS_ONCE(session
->active
) = 0;
694 /* Set transient enabler state to "disabled" */
696 lttng_session_sync_event_enablers(session
);
701 int lttng_channel_enable(struct lttng_channel
*channel
)
705 if (channel
->enabled
) {
709 /* Set transient enabler state to "enabled" */
711 lttng_session_sync_event_enablers(channel
->session
);
712 /* Set atomically the state to "enabled" */
713 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
718 int lttng_channel_disable(struct lttng_channel
*channel
)
722 if (!channel
->enabled
) {
726 /* Set atomically the state to "disabled" */
727 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
728 /* Set transient enabler state to "enabled" */
730 lttng_session_sync_event_enablers(channel
->session
);
736 struct cds_hlist_head
*borrow_hash_table_bucket(
737 struct cds_hlist_head
*hash_table
,
738 unsigned int hash_table_size
,
739 const struct lttng_event_desc
*desc
)
741 const char *event_name
;
745 event_name
= desc
->name
;
746 name_len
= strlen(event_name
);
748 hash
= jhash(event_name
, name_len
, 0);
749 return &hash_table
[hash
& (hash_table_size
- 1)];
753 * Supports event creation while tracing session is active.
756 int lttng_event_create(const struct lttng_event_desc
*desc
,
757 struct lttng_channel
*chan
)
759 struct lttng_event
*event
;
760 struct lttng_session
*session
= chan
->session
;
761 struct cds_hlist_head
*head
;
763 int notify_socket
, loglevel
;
766 head
= borrow_hash_table_bucket(chan
->session
->events_ht
.table
,
767 LTTNG_UST_EVENT_HT_SIZE
, desc
);
769 notify_socket
= lttng_get_notify_socket(session
->owner
);
770 if (notify_socket
< 0) {
775 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
778 DBG("Error (%d) adding enum to session", ret
);
779 goto create_enum_error
;
783 * Check if loglevel match. Refuse to connect event if not.
785 event
= zmalloc(sizeof(struct lttng_event
));
792 /* Event will be enabled by enabler sync. */
794 event
->registered
= 0;
795 CDS_INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
796 CDS_INIT_LIST_HEAD(&event
->enablers_ref_head
);
800 loglevel
= *(*event
->desc
->loglevel
);
802 loglevel
= TRACE_DEFAULT
;
803 if (desc
->u
.ext
.model_emf_uri
)
804 uri
= *(desc
->u
.ext
.model_emf_uri
);
808 /* Fetch event ID from sessiond */
809 ret
= ustcomm_register_event(notify_socket
,
821 DBG("Error (%d) registering event to sessiond", ret
);
822 goto sessiond_register_error
;
825 cds_list_add(&event
->node
, &chan
->session
->events_head
);
826 cds_hlist_add_head(&event
->hlist
, head
);
829 sessiond_register_error
:
838 int lttng_event_notifier_create(const struct lttng_event_desc
*desc
,
839 uint64_t token
, uint64_t error_counter_index
,
840 struct lttng_event_notifier_group
*event_notifier_group
)
842 struct lttng_event_notifier
*event_notifier
;
843 struct cds_hlist_head
*head
;
847 * Get the hashtable bucket the created lttng_event_notifier object
848 * should be inserted.
850 head
= borrow_hash_table_bucket(
851 event_notifier_group
->event_notifiers_ht
.table
,
852 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
854 event_notifier
= zmalloc(sizeof(struct lttng_event_notifier
));
855 if (!event_notifier
) {
860 event_notifier
->group
= event_notifier_group
;
861 event_notifier
->user_token
= token
;
862 event_notifier
->error_counter_index
= error_counter_index
;
864 /* Event notifier will be enabled by enabler sync. */
865 event_notifier
->enabled
= 0;
866 event_notifier
->registered
= 0;
868 CDS_INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
869 CDS_INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
870 CDS_INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
871 event_notifier
->desc
= desc
;
872 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
874 cds_list_add(&event_notifier
->node
,
875 &event_notifier_group
->event_notifiers_head
);
876 cds_hlist_add_head(&event_notifier
->hlist
, head
);
885 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
887 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
889 /* Remove from event_notifier list. */
890 cds_list_del(&event_notifier
->node
);
891 /* Remove from event_notifier hash table. */
892 cds_hlist_del(&event_notifier
->hlist
);
894 lttng_free_event_notifier_filter_runtime(event_notifier
);
896 /* Free event_notifier enabler refs */
897 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
898 &event_notifier
->enablers_ref_head
, node
)
900 free(event_notifier
);
904 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
905 struct lttng_enabler
*enabler
)
908 unsigned int has_loglevel
= 0;
910 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
911 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
912 desc
->name
, SIZE_MAX
))
914 if (desc
->loglevel
) {
915 loglevel
= *(*desc
->loglevel
);
918 if (!lttng_loglevel_match(loglevel
,
920 enabler
->event_param
.loglevel_type
,
921 enabler
->event_param
.loglevel
))
927 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
928 struct lttng_enabler
*enabler
)
931 unsigned int has_loglevel
= 0;
933 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
934 if (strcmp(desc
->name
, enabler
->event_param
.name
))
936 if (desc
->loglevel
) {
937 loglevel
= *(*desc
->loglevel
);
940 if (!lttng_loglevel_match(loglevel
,
942 enabler
->event_param
.loglevel_type
,
943 enabler
->event_param
.loglevel
))
949 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
950 struct lttng_enabler
*enabler
)
952 switch (enabler
->format_type
) {
953 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
955 struct lttng_ust_excluder_node
*excluder
;
957 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
962 * If the matching event matches with an excluder,
963 * return 'does not match'
965 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
968 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
972 excluder_name
= (char *) (excluder
->excluder
.names
)
973 + count
* LTTNG_UST_SYM_NAME_LEN
;
974 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
975 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
981 case LTTNG_ENABLER_FORMAT_EVENT
:
982 return lttng_desc_match_event_enabler(desc
, enabler
);
989 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
990 struct lttng_event
*event
)
992 if (lttng_desc_match_enabler(event
->desc
,
993 lttng_event_enabler_as_enabler(event_enabler
))
994 && event
->chan
== event_enabler
->chan
)
1001 int lttng_event_notifier_enabler_match_event_notifier(
1002 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1003 struct lttng_event_notifier
*event_notifier
)
1005 int desc_matches
= lttng_desc_match_enabler(event_notifier
->desc
,
1006 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1008 if (desc_matches
&& event_notifier
->group
== event_notifier_enabler
->group
&&
1009 event_notifier
->user_token
== event_notifier_enabler
->user_token
)
1016 struct lttng_enabler_ref
*lttng_enabler_ref(
1017 struct cds_list_head
*enabler_ref_list
,
1018 struct lttng_enabler
*enabler
)
1020 struct lttng_enabler_ref
*enabler_ref
;
1022 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
1023 if (enabler_ref
->ref
== enabler
)
1030 * Create struct lttng_event if it is missing and present in the list of
1031 * tracepoint probes.
1034 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1036 struct lttng_session
*session
= event_enabler
->chan
->session
;
1037 struct lttng_probe_desc
*probe_desc
;
1038 const struct lttng_event_desc
*desc
;
1039 struct lttng_event
*event
;
1041 struct cds_list_head
*probe_list
;
1043 probe_list
= lttng_get_probe_list_head();
1045 * For each probe event, if we find that a probe event matches
1046 * our enabler, create an associated lttng_event if not
1049 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1050 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1053 struct cds_hlist_head
*head
;
1054 struct cds_hlist_node
*node
;
1056 desc
= probe_desc
->event_desc
[i
];
1057 if (!lttng_desc_match_enabler(desc
,
1058 lttng_event_enabler_as_enabler(event_enabler
)))
1061 head
= borrow_hash_table_bucket(
1062 session
->events_ht
.table
,
1063 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1065 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
1066 if (event
->desc
== desc
1067 && event
->chan
== event_enabler
->chan
) {
1076 * We need to create an event for this
1079 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
1080 event_enabler
->chan
);
1082 DBG("Unable to create event %s, error %d\n",
1083 probe_desc
->event_desc
[i
]->name
, ret
);
1090 void probe_provider_event_for_each(struct lttng_probe_desc
*provider_desc
,
1091 void (*event_func
)(struct lttng_session
*session
,
1092 struct lttng_event
*event
),
1093 void (*event_notifier_func
)(struct lttng_event_notifier
*event_notifier
))
1095 struct cds_hlist_node
*node
, *tmp_node
;
1096 struct cds_list_head
*sessionsp
;
1099 /* Get handle on list of sessions. */
1100 sessionsp
= _lttng_get_sessions();
1103 * Iterate over all events in the probe provider descriptions and
1104 * sessions to queue the unregistration of the events.
1106 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
1107 const struct lttng_event_desc
*event_desc
;
1108 struct lttng_event_notifier_group
*event_notifier_group
;
1109 struct lttng_event_notifier
*event_notifier
;
1110 struct lttng_session
*session
;
1111 struct cds_hlist_head
*head
;
1112 struct lttng_event
*event
;
1114 event_desc
= provider_desc
->event_desc
[i
];
1117 * Iterate over all session to find the current event
1120 cds_list_for_each_entry(session
, sessionsp
, node
) {
1122 * Get the list of events in the hashtable bucket and
1123 * iterate to find the event matching this descriptor.
1125 head
= borrow_hash_table_bucket(
1126 session
->events_ht
.table
,
1127 LTTNG_UST_EVENT_HT_SIZE
, event_desc
);
1129 cds_hlist_for_each_entry_safe(event
, node
, tmp_node
, head
, hlist
) {
1130 if (event_desc
== event
->desc
) {
1131 event_func(session
, event
);
1138 * Iterate over all event_notifier groups to find the current event
1141 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1143 * Get the list of event_notifiers in the hashtable bucket and
1144 * iterate to find the event_notifier matching this
1147 head
= borrow_hash_table_bucket(
1148 event_notifier_group
->event_notifiers_ht
.table
,
1149 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, event_desc
);
1151 cds_hlist_for_each_entry_safe(event_notifier
, node
, tmp_node
, head
, hlist
) {
1152 if (event_desc
== event_notifier
->desc
) {
1153 event_notifier_func(event_notifier
);
1162 void _unregister_event(struct lttng_session
*session
,
1163 struct lttng_event
*event
)
1165 _lttng_event_unregister(event
);
1169 void _event_enum_destroy(struct lttng_session
*session
,
1170 struct lttng_event
*event
)
1174 /* Destroy enums of the current event. */
1175 for (i
= 0; i
< event
->desc
->nr_fields
; i
++) {
1176 const struct lttng_enum_desc
*enum_desc
;
1177 const struct lttng_event_field
*field
;
1178 struct lttng_enum
*curr_enum
;
1180 field
= &(event
->desc
->fields
[i
]);
1181 switch (field
->type
.atype
) {
1183 enum_desc
= field
->type
.u
.legacy
.basic
.enumeration
.desc
;
1185 case atype_enum_nestable
:
1186 enum_desc
= field
->type
.u
.enum_nestable
.desc
;
1192 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1194 _lttng_enum_destroy(curr_enum
);
1198 /* Destroy event. */
1199 _lttng_event_destroy(event
);
1203 * Iterate over all the UST sessions to unregister and destroy all probes from
1204 * the probe provider descriptor received as argument. Must me called with the
1207 void lttng_probe_provider_unregister_events(
1208 struct lttng_probe_desc
*provider_desc
)
1211 * Iterate over all events in the probe provider descriptions and sessions
1212 * to queue the unregistration of the events.
1214 probe_provider_event_for_each(provider_desc
, _unregister_event
,
1215 _lttng_event_notifier_unregister
);
1217 /* Wait for grace period. */
1218 lttng_ust_synchronize_trace();
1219 /* Prune the unregistration queue. */
1220 __tracepoint_probe_prune_release_queue();
1223 * It is now safe to destroy the events and remove them from the event list
1226 probe_provider_event_for_each(provider_desc
, _event_enum_destroy
,
1227 _lttng_event_notifier_destroy
);
1231 * Create events associated with an event enabler (if not already present),
1232 * and add backward reference from the event to the enabler.
1235 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1237 struct lttng_session
*session
= event_enabler
->chan
->session
;
1238 struct lttng_event
*event
;
1240 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1243 /* First ensure that probe events are created for this enabler. */
1244 lttng_create_event_if_missing(event_enabler
);
1246 /* For each event matching enabler in session event list. */
1247 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1248 struct lttng_enabler_ref
*enabler_ref
;
1250 if (!lttng_event_enabler_match_event(event_enabler
, event
))
1253 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
1254 lttng_event_enabler_as_enabler(event_enabler
));
1257 * If no backward ref, create it.
1258 * Add backward ref from event to enabler.
1260 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1263 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1265 cds_list_add(&enabler_ref
->node
,
1266 &event
->enablers_ref_head
);
1270 * Link filter bytecodes if not linked yet.
1272 lttng_enabler_link_bytecode(event
->desc
,
1274 &event
->filter_bytecode_runtime_head
,
1275 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1277 /* TODO: merge event context. */
1284 * Called at library load: connect the probe on all enablers matching
1286 * Called with session mutex held.
1288 int lttng_fix_pending_events(void)
1290 struct lttng_session
*session
;
1292 cds_list_for_each_entry(session
, &sessions
, node
) {
1293 lttng_session_lazy_sync_event_enablers(session
);
1298 int lttng_fix_pending_event_notifiers(void)
1300 struct lttng_event_notifier_group
*event_notifier_group
;
1302 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1303 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1309 * For each session of the owner thread, execute pending statedump.
1310 * Only dump state for the sessions owned by the caller thread, because
1311 * we don't keep ust_lock across the entire iteration.
1313 void lttng_handle_pending_statedump(void *owner
)
1315 struct lttng_session
*session
;
1317 /* Execute state dump */
1318 do_lttng_ust_statedump(owner
);
1320 /* Clear pending state dump */
1324 cds_list_for_each_entry(session
, &sessions
, node
) {
1325 if (session
->owner
!= owner
)
1327 if (!session
->statedump_pending
)
1329 session
->statedump_pending
= 0;
1337 * Only used internally at session destruction.
1340 void _lttng_event_destroy(struct lttng_event
*event
)
1342 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1344 /* Remove from event list. */
1345 cds_list_del(&event
->node
);
1346 /* Remove from event hash table. */
1347 cds_hlist_del(&event
->hlist
);
1349 lttng_destroy_context(event
->ctx
);
1350 lttng_free_event_filter_runtime(event
);
1351 /* Free event enabler refs */
1352 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1353 &event
->enablers_ref_head
, node
)
1359 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1361 cds_list_del(&_enum
->node
);
1362 cds_hlist_del(&_enum
->hlist
);
1366 void lttng_ust_events_exit(void)
1368 struct lttng_session
*session
, *tmpsession
;
1370 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, node
)
1371 lttng_session_destroy(session
);
1375 * Enabler management.
1377 struct lttng_event_enabler
*lttng_event_enabler_create(
1378 enum lttng_enabler_format_type format_type
,
1379 struct lttng_ust_event
*event_param
,
1380 struct lttng_channel
*chan
)
1382 struct lttng_event_enabler
*event_enabler
;
1384 event_enabler
= zmalloc(sizeof(*event_enabler
));
1387 event_enabler
->base
.format_type
= format_type
;
1388 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1389 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1390 memcpy(&event_enabler
->base
.event_param
, event_param
,
1391 sizeof(event_enabler
->base
.event_param
));
1392 event_enabler
->chan
= chan
;
1394 event_enabler
->base
.enabled
= 0;
1395 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
1396 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1398 return event_enabler
;
1401 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1402 struct lttng_event_notifier_group
*event_notifier_group
,
1403 enum lttng_enabler_format_type format_type
,
1404 struct lttng_ust_event_notifier
*event_notifier_param
)
1406 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1408 event_notifier_enabler
= zmalloc(sizeof(*event_notifier_enabler
));
1409 if (!event_notifier_enabler
)
1411 event_notifier_enabler
->base
.format_type
= format_type
;
1412 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1413 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
1414 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.excluder_head
);
1416 event_notifier_enabler
->user_token
= event_notifier_param
->event
.token
;
1417 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
1418 event_notifier_enabler
->num_captures
= 0;
1420 memcpy(&event_notifier_enabler
->base
.event_param
.name
,
1421 event_notifier_param
->event
.name
,
1422 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1423 event_notifier_enabler
->base
.event_param
.instrumentation
=
1424 event_notifier_param
->event
.instrumentation
;
1425 event_notifier_enabler
->base
.event_param
.loglevel
=
1426 event_notifier_param
->event
.loglevel
;
1427 event_notifier_enabler
->base
.event_param
.loglevel_type
=
1428 event_notifier_param
->event
.loglevel_type
;
1430 event_notifier_enabler
->base
.enabled
= 0;
1431 event_notifier_enabler
->group
= event_notifier_group
;
1433 cds_list_add(&event_notifier_enabler
->node
,
1434 &event_notifier_group
->enablers_head
);
1436 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1438 return event_notifier_enabler
;
1441 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1443 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1444 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1449 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1451 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1452 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1458 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1459 struct lttng_ust_bytecode_node
**bytecode
)
1461 (*bytecode
)->enabler
= enabler
;
1462 cds_list_add_tail(&(*bytecode
)->node
, &enabler
->filter_bytecode_head
);
1463 /* Take ownership of bytecode */
1467 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1468 struct lttng_ust_bytecode_node
**bytecode
)
1470 _lttng_enabler_attach_filter_bytecode(
1471 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1473 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1478 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1479 struct lttng_ust_excluder_node
**excluder
)
1481 (*excluder
)->enabler
= enabler
;
1482 cds_list_add_tail(&(*excluder
)->node
, &enabler
->excluder_head
);
1483 /* Take ownership of excluder */
1487 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1488 struct lttng_ust_excluder_node
**excluder
)
1490 _lttng_enabler_attach_exclusion(
1491 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1493 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1497 int lttng_event_notifier_enabler_enable(
1498 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1500 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
1501 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1506 int lttng_event_notifier_enabler_disable(
1507 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1509 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
1510 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1515 int lttng_event_notifier_enabler_attach_filter_bytecode(
1516 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1517 struct lttng_ust_bytecode_node
**bytecode
)
1519 _lttng_enabler_attach_filter_bytecode(
1520 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1523 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1527 int lttng_event_notifier_enabler_attach_capture_bytecode(
1528 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1529 struct lttng_ust_bytecode_node
*bytecode
)
1531 bytecode
->enabler
= lttng_event_notifier_enabler_as_enabler(
1532 event_notifier_enabler
);
1533 cds_list_add_tail(&bytecode
->node
,
1534 &event_notifier_enabler
->capture_bytecode_head
);
1535 event_notifier_enabler
->num_captures
++;
1537 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1541 int lttng_event_notifier_enabler_attach_exclusion(
1542 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1543 struct lttng_ust_excluder_node
**excluder
)
1545 _lttng_enabler_attach_exclusion(
1546 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1549 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1553 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1554 union ust_args
*uargs
,
1555 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1558 * We cannot attach a context after trace has been started for a
1559 * session because the metadata does not allow expressing this
1560 * information outside of the original channel scope.
1562 if (session
->been_active
)
1565 switch (context_param
->ctx
) {
1566 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1567 return lttng_add_pthread_id_to_ctx(ctx
);
1568 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1570 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1572 perf_ctx_param
= &context_param
->u
.perf_counter
;
1573 return lttng_add_perf_counter_to_ctx(
1574 perf_ctx_param
->type
,
1575 perf_ctx_param
->config
,
1576 perf_ctx_param
->name
,
1579 case LTTNG_UST_CONTEXT_VTID
:
1580 return lttng_add_vtid_to_ctx(ctx
);
1581 case LTTNG_UST_CONTEXT_VPID
:
1582 return lttng_add_vpid_to_ctx(ctx
);
1583 case LTTNG_UST_CONTEXT_PROCNAME
:
1584 return lttng_add_procname_to_ctx(ctx
);
1585 case LTTNG_UST_CONTEXT_IP
:
1586 return lttng_add_ip_to_ctx(ctx
);
1587 case LTTNG_UST_CONTEXT_CPU_ID
:
1588 return lttng_add_cpu_id_to_ctx(ctx
);
1589 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1590 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1592 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1593 return lttng_add_cgroup_ns_to_ctx(ctx
);
1594 case LTTNG_UST_CONTEXT_IPC_NS
:
1595 return lttng_add_ipc_ns_to_ctx(ctx
);
1596 case LTTNG_UST_CONTEXT_MNT_NS
:
1597 return lttng_add_mnt_ns_to_ctx(ctx
);
1598 case LTTNG_UST_CONTEXT_NET_NS
:
1599 return lttng_add_net_ns_to_ctx(ctx
);
1600 case LTTNG_UST_CONTEXT_PID_NS
:
1601 return lttng_add_pid_ns_to_ctx(ctx
);
1602 case LTTNG_UST_CONTEXT_TIME_NS
:
1603 return lttng_add_time_ns_to_ctx(ctx
);
1604 case LTTNG_UST_CONTEXT_USER_NS
:
1605 return lttng_add_user_ns_to_ctx(ctx
);
1606 case LTTNG_UST_CONTEXT_UTS_NS
:
1607 return lttng_add_uts_ns_to_ctx(ctx
);
1608 case LTTNG_UST_CONTEXT_VUID
:
1609 return lttng_add_vuid_to_ctx(ctx
);
1610 case LTTNG_UST_CONTEXT_VEUID
:
1611 return lttng_add_veuid_to_ctx(ctx
);
1612 case LTTNG_UST_CONTEXT_VSUID
:
1613 return lttng_add_vsuid_to_ctx(ctx
);
1614 case LTTNG_UST_CONTEXT_VGID
:
1615 return lttng_add_vgid_to_ctx(ctx
);
1616 case LTTNG_UST_CONTEXT_VEGID
:
1617 return lttng_add_vegid_to_ctx(ctx
);
1618 case LTTNG_UST_CONTEXT_VSGID
:
1619 return lttng_add_vsgid_to_ctx(ctx
);
1625 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*enabler
,
1626 struct lttng_ust_context
*context_param
)
1631 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1633 if (!event_enabler
) {
1636 cds_list_del(&event_enabler
->node
);
1638 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1640 lttng_destroy_context(event_enabler
->ctx
);
1641 free(event_enabler
);
1645 * lttng_session_sync_event_enablers should be called just before starting a
1649 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
1651 struct lttng_event_enabler
*event_enabler
;
1652 struct lttng_event
*event
;
1654 cds_list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
1655 lttng_event_enabler_ref_events(event_enabler
);
1657 * For each event, if at least one of its enablers is enabled,
1658 * and its channel and session transient states are enabled, we
1659 * enable the event, else we disable it.
1661 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1662 struct lttng_enabler_ref
*enabler_ref
;
1663 struct lttng_bytecode_runtime
*runtime
;
1664 int enabled
= 0, has_enablers_without_bytecode
= 0;
1667 cds_list_for_each_entry(enabler_ref
,
1668 &event
->enablers_ref_head
, node
) {
1669 if (enabler_ref
->ref
->enabled
) {
1675 * Enabled state is based on union of enablers, with
1676 * intesection of session and channel transient enable
1679 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1681 CMM_STORE_SHARED(event
->enabled
, enabled
);
1683 * Sync tracepoint registration with event enabled
1687 if (!event
->registered
)
1688 register_event(event
);
1690 if (event
->registered
)
1691 unregister_event(event
);
1694 /* Check if has enablers without bytecode enabled */
1695 cds_list_for_each_entry(enabler_ref
,
1696 &event
->enablers_ref_head
, node
) {
1697 if (enabler_ref
->ref
->enabled
1698 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1699 has_enablers_without_bytecode
= 1;
1703 event
->has_enablers_without_bytecode
=
1704 has_enablers_without_bytecode
;
1706 /* Enable filters */
1707 cds_list_for_each_entry(runtime
,
1708 &event
->filter_bytecode_runtime_head
, node
) {
1709 lttng_bytecode_filter_sync_state(runtime
);
1712 __tracepoint_probe_prune_release_queue();
1715 /* Support for event notifier is introduced by probe provider major version 2. */
1717 bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc
*probe_desc
)
1719 return probe_desc
->major
>= 2;
1723 void lttng_create_event_notifier_if_missing(
1724 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1726 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1727 struct lttng_probe_desc
*probe_desc
;
1728 struct cds_list_head
*probe_list
;
1731 probe_list
= lttng_get_probe_list_head();
1733 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1734 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1737 const struct lttng_event_desc
*desc
;
1738 struct lttng_event_notifier
*event_notifier
;
1739 struct cds_hlist_head
*head
;
1740 struct cds_hlist_node
*node
;
1742 desc
= probe_desc
->event_desc
[i
];
1744 if (!lttng_desc_match_enabler(desc
,
1745 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1749 * Given the current event_notifier group, get the bucket that
1750 * the target event_notifier would be if it was already
1753 head
= borrow_hash_table_bucket(
1754 event_notifier_group
->event_notifiers_ht
.table
,
1755 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
1757 cds_hlist_for_each_entry(event_notifier
, node
, head
, hlist
) {
1759 * Check if event_notifier already exists by checking
1760 * if the event_notifier and enabler share the same
1761 * description and id.
1763 if (event_notifier
->desc
== desc
&&
1764 event_notifier
->user_token
== event_notifier_enabler
->user_token
) {
1773 /* Check that the probe supports event notifiers, else report the error. */
1774 if (!lttng_ust_probe_supports_event_notifier(probe_desc
)) {
1775 ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, "
1776 "but its version (%u.%u) is too old and does not implement event notifiers. "
1777 "It needs to be recompiled against a newer version of LTTng-UST, otherwise "
1778 "this event will not generate any notification.",
1779 probe_desc
->provider
,
1786 * We need to create a event_notifier for this event probe.
1788 ret
= lttng_event_notifier_create(desc
,
1789 event_notifier_enabler
->user_token
,
1790 event_notifier_enabler
->error_counter_index
,
1791 event_notifier_group
);
1793 DBG("Unable to create event_notifier %s, error %d\n",
1794 probe_desc
->event_desc
[i
]->name
, ret
);
1801 * Create event_notifiers associated with a event_notifier enabler (if not already present).
1804 int lttng_event_notifier_enabler_ref_event_notifiers(
1805 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1807 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1808 struct lttng_event_notifier
*event_notifier
;
1811 * Only try to create event_notifiers for enablers that are enabled, the user
1812 * might still be attaching filter or exclusion to the
1813 * event_notifier_enabler.
1815 if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
)
1818 /* First, ensure that probe event_notifiers are created for this enabler. */
1819 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
1821 /* Link the created event_notifier with its associated enabler. */
1822 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1823 struct lttng_enabler_ref
*enabler_ref
;
1825 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
1828 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
1829 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1832 * If no backward ref, create it.
1833 * Add backward ref from event_notifier to enabler.
1835 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1839 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
1840 event_notifier_enabler
);
1841 cds_list_add(&enabler_ref
->node
,
1842 &event_notifier
->enablers_ref_head
);
1846 * Link filter bytecodes if not linked yet.
1848 lttng_enabler_link_bytecode(event_notifier
->desc
,
1849 &event_notifier_group
->ctx
,
1850 &event_notifier
->filter_bytecode_runtime_head
,
1851 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
1854 * Link capture bytecodes if not linked yet.
1856 lttng_enabler_link_bytecode(event_notifier
->desc
,
1857 &event_notifier_group
->ctx
, &event_notifier
->capture_bytecode_runtime_head
,
1858 &event_notifier_enabler
->capture_bytecode_head
);
1860 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
1867 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
1869 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1870 struct lttng_event_notifier
*event_notifier
;
1872 cds_list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
1873 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
1876 * For each event_notifier, if at least one of its enablers is enabled,
1877 * we enable the event_notifier, else we disable it.
1879 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1880 struct lttng_enabler_ref
*enabler_ref
;
1881 struct lttng_bytecode_runtime
*runtime
;
1882 int enabled
= 0, has_enablers_without_bytecode
= 0;
1884 /* Enable event_notifiers */
1885 cds_list_for_each_entry(enabler_ref
,
1886 &event_notifier
->enablers_ref_head
, node
) {
1887 if (enabler_ref
->ref
->enabled
) {
1893 CMM_STORE_SHARED(event_notifier
->enabled
, enabled
);
1895 * Sync tracepoint registration with event_notifier enabled
1899 if (!event_notifier
->registered
)
1900 register_event_notifier(event_notifier
);
1902 if (event_notifier
->registered
)
1903 unregister_event_notifier(event_notifier
);
1906 /* Check if has enablers without bytecode enabled */
1907 cds_list_for_each_entry(enabler_ref
,
1908 &event_notifier
->enablers_ref_head
, node
) {
1909 if (enabler_ref
->ref
->enabled
1910 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1911 has_enablers_without_bytecode
= 1;
1915 event_notifier
->has_enablers_without_bytecode
=
1916 has_enablers_without_bytecode
;
1918 /* Enable filters */
1919 cds_list_for_each_entry(runtime
,
1920 &event_notifier
->filter_bytecode_runtime_head
, node
) {
1921 lttng_bytecode_filter_sync_state(runtime
);
1924 /* Enable captures. */
1925 cds_list_for_each_entry(runtime
,
1926 &event_notifier
->capture_bytecode_runtime_head
, node
) {
1927 lttng_bytecode_capture_sync_state(runtime
);
1930 __tracepoint_probe_prune_release_queue();
1934 * Apply enablers to session events, adding events to session if need
1935 * be. It is required after each modification applied to an active
1936 * session, and right before session "start".
1937 * "lazy" sync means we only sync if required.
1940 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
1942 /* We can skip if session is not active */
1943 if (!session
->active
)
1945 lttng_session_sync_event_enablers(session
);
1949 * Update all sessions with the given app context.
1950 * Called with ust lock held.
1951 * This is invoked when an application context gets loaded/unloaded. It
1952 * ensures the context callbacks are in sync with the application
1953 * context (either app context callbacks, or dummy callbacks).
1955 void lttng_ust_context_set_session_provider(const char *name
,
1956 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1957 void (*record
)(struct lttng_ctx_field
*field
,
1958 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1959 struct lttng_channel
*chan
),
1960 void (*get_value
)(struct lttng_ctx_field
*field
,
1961 struct lttng_ctx_value
*value
))
1963 struct lttng_session
*session
;
1965 cds_list_for_each_entry(session
, &sessions
, node
) {
1966 struct lttng_channel
*chan
;
1967 struct lttng_event
*event
;
1970 ret
= lttng_ust_context_set_provider_rcu(&session
->ctx
,
1971 name
, get_size
, record
, get_value
);
1974 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
1975 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1976 name
, get_size
, record
, get_value
);
1980 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1981 ret
= lttng_ust_context_set_provider_rcu(&event
->ctx
,
1982 name
, get_size
, record
, get_value
);
1990 * Update all event_notifier groups with the given app context.
1991 * Called with ust lock held.
1992 * This is invoked when an application context gets loaded/unloaded. It
1993 * ensures the context callbacks are in sync with the application
1994 * context (either app context callbacks, or dummy callbacks).
1996 void lttng_ust_context_set_event_notifier_group_provider(const char *name
,
1997 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1998 void (*record
)(struct lttng_ctx_field
*field
,
1999 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
2000 struct lttng_channel
*chan
),
2001 void (*get_value
)(struct lttng_ctx_field
*field
,
2002 struct lttng_ctx_value
*value
))
2004 struct lttng_event_notifier_group
*event_notifier_group
;
2006 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2009 ret
= lttng_ust_context_set_provider_rcu(
2010 &event_notifier_group
->ctx
,
2011 name
, get_size
, record
, get_value
);