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
26 #include <urcu/list.h>
27 #include <urcu/hlist.h>
37 #include <lttng/ust-endian.h>
41 #include <urcu/compiler.h>
42 #include <urcu/uatomic.h>
43 #include <urcu/arch.h>
45 #include <lttng/tracepoint.h>
46 #include <lttng/ust-events.h>
48 #include <usterr-signal-safe.h>
50 #include <lttng/ust-ctl.h>
52 #include <lttng/ust-dynamic-type.h>
53 #include <lttng/ust-context-provider.h>
56 #include "lttng-ust-uuid.h"
58 #include "tracepoint-internal.h"
59 #include "string-utils.h"
60 #include "lttng-tracer.h"
61 #include "lttng-tracer-core.h"
62 #include "lttng-ust-statedump.h"
64 #include "../libringbuffer/shm.h"
68 * All operations within this file are called by the communication
69 * thread, under ust_lock protection.
72 static CDS_LIST_HEAD(sessions
);
74 struct cds_list_head
*_lttng_get_sessions(void)
79 static void _lttng_event_destroy(struct lttng_event
*event
);
80 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
83 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
85 void lttng_session_sync_enablers(struct lttng_session
*session
);
87 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
90 * Called with ust lock held.
92 int lttng_session_active(void)
94 struct lttng_session
*iter
;
96 cds_list_for_each_entry(iter
, &sessions
, node
) {
104 int lttng_loglevel_match(int loglevel
,
105 unsigned int has_loglevel
,
106 enum lttng_ust_loglevel_type req_type
,
110 loglevel
= TRACE_DEFAULT
;
112 case LTTNG_UST_LOGLEVEL_RANGE
:
113 if (loglevel
<= req_loglevel
114 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
118 case LTTNG_UST_LOGLEVEL_SINGLE
:
119 if (loglevel
== req_loglevel
120 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
124 case LTTNG_UST_LOGLEVEL_ALL
:
126 if (loglevel
<= TRACE_DEBUG
)
133 void synchronize_trace(void)
138 struct lttng_session
*lttng_session_create(void)
140 struct lttng_session
*session
;
143 session
= zmalloc(sizeof(struct lttng_session
));
146 if (lttng_session_context_init(&session
->ctx
)) {
150 CDS_INIT_LIST_HEAD(&session
->chan_head
);
151 CDS_INIT_LIST_HEAD(&session
->events_head
);
152 CDS_INIT_LIST_HEAD(&session
->enums_head
);
153 CDS_INIT_LIST_HEAD(&session
->enablers_head
);
154 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
155 CDS_INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
156 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
157 CDS_INIT_HLIST_HEAD(&session
->enums_ht
.table
[i
]);
158 cds_list_add(&session
->node
, &sessions
);
163 * Only used internally at session destruction.
166 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
168 struct channel
*chan
;
169 struct lttng_ust_shm_handle
*handle
;
171 cds_list_del(<tng_chan
->node
);
172 lttng_destroy_context(lttng_chan
->ctx
);
173 chan
= lttng_chan
->chan
;
174 handle
= lttng_chan
->handle
;
176 * note: lttng_chan is private data contained within handle. It
177 * will be freed along with the handle.
179 channel_destroy(chan
, handle
, 0);
183 void register_event(struct lttng_event
*event
)
186 const struct lttng_event_desc
*desc
;
188 assert(event
->registered
== 0);
190 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
191 desc
->probe_callback
,
192 event
, desc
->signature
);
195 event
->registered
= 1;
199 void unregister_event(struct lttng_event
*event
)
202 const struct lttng_event_desc
*desc
;
204 assert(event
->registered
== 1);
206 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
207 desc
->probe_callback
,
211 event
->registered
= 0;
215 * Only used internally at session destruction.
218 void _lttng_event_unregister(struct lttng_event
*event
)
220 if (event
->registered
)
221 unregister_event(event
);
224 void lttng_session_destroy(struct lttng_session
*session
)
226 struct lttng_channel
*chan
, *tmpchan
;
227 struct lttng_event
*event
, *tmpevent
;
228 struct lttng_enum
*_enum
, *tmp_enum
;
229 struct lttng_enabler
*enabler
, *tmpenabler
;
231 CMM_ACCESS_ONCE(session
->active
) = 0;
232 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
233 _lttng_event_unregister(event
);
235 synchronize_trace(); /* Wait for in-flight events to complete */
236 __tracepoint_probe_prune_release_queue();
237 cds_list_for_each_entry_safe(enabler
, tmpenabler
,
238 &session
->enablers_head
, node
)
239 lttng_enabler_destroy(enabler
);
240 cds_list_for_each_entry_safe(event
, tmpevent
,
241 &session
->events_head
, node
)
242 _lttng_event_destroy(event
);
243 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
244 &session
->enums_head
, node
)
245 _lttng_enum_destroy(_enum
);
246 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan_head
, node
)
247 _lttng_channel_unmap(chan
);
248 cds_list_del(&session
->node
);
249 lttng_destroy_context(session
->ctx
);
254 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
255 struct lttng_session
*session
)
257 const char *enum_name
= desc
->name
;
258 struct lttng_enum
*_enum
;
259 struct cds_hlist_head
*head
;
261 size_t name_len
= strlen(enum_name
);
265 /* Check if this enum is already registered for this session. */
266 hash
= jhash(enum_name
, name_len
, 0);
267 head
= &session
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
269 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
275 notify_socket
= lttng_get_notify_socket(session
->owner
);
276 if (notify_socket
< 0) {
281 _enum
= zmalloc(sizeof(*_enum
));
286 _enum
->session
= session
;
289 ret
= ustcomm_register_enum(notify_socket
,
296 DBG("Error (%d) registering enumeration to sessiond", ret
);
297 goto sessiond_register_error
;
299 cds_list_add(&_enum
->node
, &session
->enums_head
);
300 cds_hlist_add_head(&_enum
->hlist
, head
);
303 sessiond_register_error
:
312 int lttng_create_enum_check(const struct lttng_type
*type
,
313 struct lttng_session
*session
)
315 switch (type
->atype
) {
318 const struct lttng_enum_desc
*enum_desc
;
321 enum_desc
= type
->u
.legacy
.basic
.enumeration
.desc
;
322 ret
= lttng_enum_create(enum_desc
, session
);
323 if (ret
&& ret
!= -EEXIST
) {
324 DBG("Unable to create enum error: (%d)", ret
);
329 case atype_enum_nestable
:
331 const struct lttng_enum_desc
*enum_desc
;
334 enum_desc
= type
->u
.enum_nestable
.desc
;
335 ret
= lttng_enum_create(enum_desc
, session
);
336 if (ret
&& ret
!= -EEXIST
) {
337 DBG("Unable to create enum error: (%d)", ret
);
344 const struct lttng_event_field
*tag_field_generic
;
345 const struct lttng_enum_desc
*enum_desc
;
348 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
349 enum_desc
= tag_field_generic
->type
.u
.enum_nestable
.desc
;
350 ret
= lttng_enum_create(enum_desc
, session
);
351 if (ret
&& ret
!= -EEXIST
) {
352 DBG("Unable to create enum error: (%d)", ret
);
358 /* TODO: nested types when they become supported. */
365 int lttng_create_all_event_enums(size_t nr_fields
,
366 const struct lttng_event_field
*event_fields
,
367 struct lttng_session
*session
)
372 /* For each field, ensure enum is part of the session. */
373 for (i
= 0; i
< nr_fields
; i
++) {
374 const struct lttng_type
*type
= &event_fields
[i
].type
;
376 ret
= lttng_create_enum_check(type
, session
);
384 int lttng_create_all_ctx_enums(size_t nr_fields
,
385 const struct lttng_ctx_field
*ctx_fields
,
386 struct lttng_session
*session
)
391 /* For each field, ensure enum is part of the session. */
392 for (i
= 0; i
< nr_fields
; i
++) {
393 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
395 ret
= lttng_create_enum_check(type
, session
);
403 * Ensure that a state-dump will be performed for this session at the end
404 * of the current handle_message().
406 int lttng_session_statedump(struct lttng_session
*session
)
408 session
->statedump_pending
= 1;
409 lttng_ust_sockinfo_session_enabled(session
->owner
);
413 int lttng_session_enable(struct lttng_session
*session
)
416 struct lttng_channel
*chan
;
419 if (session
->active
) {
424 notify_socket
= lttng_get_notify_socket(session
->owner
);
425 if (notify_socket
< 0)
426 return notify_socket
;
428 /* Set transient enabler state to "enabled" */
431 /* We need to sync enablers with session before activation. */
432 lttng_session_sync_enablers(session
);
435 * Snapshot the number of events per channel to know the type of header
438 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
439 const struct lttng_ctx
*ctx
;
440 const struct lttng_ctx_field
*fields
= NULL
;
441 size_t nr_fields
= 0;
444 /* don't change it if session stop/restart */
445 if (chan
->header_type
)
449 nr_fields
= ctx
->nr_fields
;
450 fields
= ctx
->fields
;
451 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
454 DBG("Error (%d) adding enum to session", ret
);
458 ret
= ustcomm_register_channel(notify_socket
,
467 DBG("Error (%d) registering channel to sessiond", ret
);
470 if (chan_id
!= chan
->id
) {
471 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
477 /* Set atomically the state to "active" */
478 CMM_ACCESS_ONCE(session
->active
) = 1;
479 CMM_ACCESS_ONCE(session
->been_active
) = 1;
481 ret
= lttng_session_statedump(session
);
488 int lttng_session_disable(struct lttng_session
*session
)
492 if (!session
->active
) {
496 /* Set atomically the state to "inactive" */
497 CMM_ACCESS_ONCE(session
->active
) = 0;
499 /* Set transient enabler state to "disabled" */
501 lttng_session_sync_enablers(session
);
506 int lttng_channel_enable(struct lttng_channel
*channel
)
510 if (channel
->enabled
) {
514 /* Set transient enabler state to "enabled" */
516 lttng_session_sync_enablers(channel
->session
);
517 /* Set atomically the state to "enabled" */
518 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
523 int lttng_channel_disable(struct lttng_channel
*channel
)
527 if (!channel
->enabled
) {
531 /* Set atomically the state to "disabled" */
532 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
533 /* Set transient enabler state to "enabled" */
535 lttng_session_sync_enablers(channel
->session
);
541 * Supports event creation while tracing session is active.
544 int lttng_event_create(const struct lttng_event_desc
*desc
,
545 struct lttng_channel
*chan
)
547 const char *event_name
= desc
->name
;
548 struct lttng_event
*event
;
549 struct lttng_session
*session
= chan
->session
;
550 struct cds_hlist_head
*head
;
552 size_t name_len
= strlen(event_name
);
554 int notify_socket
, loglevel
;
557 hash
= jhash(event_name
, name_len
, 0);
558 head
= &chan
->session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
560 notify_socket
= lttng_get_notify_socket(session
->owner
);
561 if (notify_socket
< 0) {
566 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
569 DBG("Error (%d) adding enum to session", ret
);
570 goto create_enum_error
;
574 * Check if loglevel match. Refuse to connect event if not.
576 event
= zmalloc(sizeof(struct lttng_event
));
583 /* Event will be enabled by enabler sync. */
585 event
->registered
= 0;
586 CDS_INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
587 CDS_INIT_LIST_HEAD(&event
->enablers_ref_head
);
591 loglevel
= *(*event
->desc
->loglevel
);
593 loglevel
= TRACE_DEFAULT
;
594 if (desc
->u
.ext
.model_emf_uri
)
595 uri
= *(desc
->u
.ext
.model_emf_uri
);
599 /* Fetch event ID from sessiond */
600 ret
= ustcomm_register_event(notify_socket
,
612 DBG("Error (%d) registering event to sessiond", ret
);
613 goto sessiond_register_error
;
616 cds_list_add(&event
->node
, &chan
->session
->events_head
);
617 cds_hlist_add_head(&event
->hlist
, head
);
620 sessiond_register_error
:
629 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
630 struct lttng_enabler
*enabler
)
633 unsigned int has_loglevel
= 0;
635 assert(enabler
->type
== LTTNG_ENABLER_STAR_GLOB
);
636 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
637 desc
->name
, SIZE_MAX
))
639 if (desc
->loglevel
) {
640 loglevel
= *(*desc
->loglevel
);
643 if (!lttng_loglevel_match(loglevel
,
645 enabler
->event_param
.loglevel_type
,
646 enabler
->event_param
.loglevel
))
652 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
653 struct lttng_enabler
*enabler
)
656 unsigned int has_loglevel
= 0;
658 assert(enabler
->type
== LTTNG_ENABLER_EVENT
);
659 if (strcmp(desc
->name
, enabler
->event_param
.name
))
661 if (desc
->loglevel
) {
662 loglevel
= *(*desc
->loglevel
);
665 if (!lttng_loglevel_match(loglevel
,
667 enabler
->event_param
.loglevel_type
,
668 enabler
->event_param
.loglevel
))
674 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
675 struct lttng_enabler
*enabler
)
677 switch (enabler
->type
) {
678 case LTTNG_ENABLER_STAR_GLOB
:
680 struct lttng_ust_excluder_node
*excluder
;
682 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
687 * If the matching event matches with an excluder,
688 * return 'does not match'
690 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
693 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
697 excluder_name
= (char *) (excluder
->excluder
.names
)
698 + count
* LTTNG_UST_SYM_NAME_LEN
;
699 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
700 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
706 case LTTNG_ENABLER_EVENT
:
707 return lttng_desc_match_event_enabler(desc
, enabler
);
714 int lttng_event_match_enabler(struct lttng_event
*event
,
715 struct lttng_enabler
*enabler
)
717 if (lttng_desc_match_enabler(event
->desc
, enabler
)
718 && event
->chan
== enabler
->chan
)
725 struct lttng_enabler_ref
* lttng_event_enabler_ref(struct lttng_event
*event
,
726 struct lttng_enabler
*enabler
)
728 struct lttng_enabler_ref
*enabler_ref
;
730 cds_list_for_each_entry(enabler_ref
,
731 &event
->enablers_ref_head
, node
) {
732 if (enabler_ref
->ref
== enabler
)
739 * Create struct lttng_event if it is missing and present in the list of
743 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
745 struct lttng_session
*session
= enabler
->chan
->session
;
746 struct lttng_probe_desc
*probe_desc
;
747 const struct lttng_event_desc
*desc
;
748 struct lttng_event
*event
;
750 struct cds_list_head
*probe_list
;
752 probe_list
= lttng_get_probe_list_head();
754 * For each probe event, if we find that a probe event matches
755 * our enabler, create an associated lttng_event if not
758 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
759 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
762 struct cds_hlist_head
*head
;
763 struct cds_hlist_node
*node
;
764 const char *event_name
;
768 desc
= probe_desc
->event_desc
[i
];
769 if (!lttng_desc_match_enabler(desc
, enabler
))
771 event_name
= desc
->name
;
772 name_len
= strlen(event_name
);
775 * Check if already created.
777 hash
= jhash(event_name
, name_len
, 0);
778 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
779 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
780 if (event
->desc
== desc
781 && event
->chan
== enabler
->chan
) {
790 * We need to create an event for this
793 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
796 DBG("Unable to create event %s, error %d\n",
797 probe_desc
->event_desc
[i
]->name
, ret
);
804 * Iterate over all the UST sessions to unregister and destroy all probes from
805 * the probe provider descriptor received as argument. Must me called with the
808 void lttng_probe_provider_unregister_events(struct lttng_probe_desc
*provider_desc
)
810 struct cds_hlist_node
*node
, *tmp_node
;
811 struct cds_list_head
*sessionsp
;
812 struct lttng_session
*session
;
813 struct cds_hlist_head
*head
;
814 struct lttng_event
*event
;
817 /* Get handle on list of sessions. */
818 sessionsp
= _lttng_get_sessions();
821 * Iterate over all events in the probe provider descriptions and sessions
822 * to queue the unregistration of the events.
824 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
825 const struct lttng_event_desc
*event_desc
;
826 const char *event_name
;
830 event_desc
= provider_desc
->event_desc
[i
];
831 event_name
= event_desc
->name
;
832 name_len
= strlen(event_name
);
833 hash
= jhash(event_name
, name_len
, 0);
835 /* Iterate over all session to find the current event description. */
836 cds_list_for_each_entry(session
, sessionsp
, node
) {
838 * Get the list of events in the hashtable bucket and iterate to
839 * find the event matching this descriptor.
841 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
842 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
843 if (event_desc
== event
->desc
) {
844 /* Queue the unregistration of this event. */
845 _lttng_event_unregister(event
);
852 /* Wait for grace period. */
854 /* Prune the unregistration queue. */
855 __tracepoint_probe_prune_release_queue();
858 * It is now safe to destroy the events and remove them from the event list
861 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
862 const struct lttng_event_desc
*event_desc
;
863 const char *event_name
;
867 event_desc
= provider_desc
->event_desc
[i
];
868 event_name
= event_desc
->name
;
869 name_len
= strlen(event_name
);
870 hash
= jhash(event_name
, name_len
, 0);
872 /* Iterate over all sessions to find the current event description. */
873 cds_list_for_each_entry(session
, sessionsp
, node
) {
875 * Get the list of events in the hashtable bucket and iterate to
876 * find the event matching this descriptor.
878 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
879 cds_hlist_for_each_entry_safe(event
, node
, tmp_node
, head
, hlist
) {
880 if (event_desc
== event
->desc
) {
881 /* Destroy enums of the current event. */
882 for (j
= 0; j
< event
->desc
->nr_fields
; j
++) {
883 const struct lttng_enum_desc
*enum_desc
;
884 const struct lttng_event_field
*field
;
885 struct lttng_enum
*curr_enum
;
887 field
= &(event
->desc
->fields
[j
]);
888 switch (field
->type
.atype
) {
890 enum_desc
= field
->type
.u
.legacy
.basic
.enumeration
.desc
;
892 case atype_enum_nestable
:
893 enum_desc
= field
->type
.u
.enum_nestable
.desc
;
898 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
900 _lttng_enum_destroy(curr_enum
);
905 _lttng_event_destroy(event
);
914 * Create events associated with an enabler (if not already present),
915 * and add backward reference from the event to the enabler.
918 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
920 struct lttng_session
*session
= enabler
->chan
->session
;
921 struct lttng_event
*event
;
923 if (!enabler
->enabled
)
926 /* First ensure that probe events are created for this enabler. */
927 lttng_create_event_if_missing(enabler
);
929 /* For each event matching enabler in session event list. */
930 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
931 struct lttng_enabler_ref
*enabler_ref
;
933 if (!lttng_event_match_enabler(event
, enabler
))
936 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
939 * If no backward ref, create it.
940 * Add backward ref from event to enabler.
942 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
945 enabler_ref
->ref
= enabler
;
946 cds_list_add(&enabler_ref
->node
,
947 &event
->enablers_ref_head
);
951 * Link filter bytecodes if not linked yet.
953 lttng_enabler_event_link_bytecode(event
, enabler
);
955 /* TODO: merge event context. */
962 * Called at library load: connect the probe on all enablers matching
964 * Called with session mutex held.
966 int lttng_fix_pending_events(void)
968 struct lttng_session
*session
;
970 cds_list_for_each_entry(session
, &sessions
, node
) {
971 lttng_session_lazy_sync_enablers(session
);
977 * For each session of the owner thread, execute pending statedump.
978 * Only dump state for the sessions owned by the caller thread, because
979 * we don't keep ust_lock across the entire iteration.
981 void lttng_handle_pending_statedump(void *owner
)
983 struct lttng_session
*session
;
985 /* Execute state dump */
986 do_lttng_ust_statedump(owner
);
988 /* Clear pending state dump */
992 cds_list_for_each_entry(session
, &sessions
, node
) {
993 if (session
->owner
!= owner
)
995 if (!session
->statedump_pending
)
997 session
->statedump_pending
= 0;
1005 * Only used internally at session destruction.
1008 void _lttng_event_destroy(struct lttng_event
*event
)
1010 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1012 /* Remove from event list. */
1013 cds_list_del(&event
->node
);
1014 /* Remove from event hash table. */
1015 cds_hlist_del(&event
->hlist
);
1017 lttng_destroy_context(event
->ctx
);
1018 lttng_free_event_filter_runtime(event
);
1019 /* Free event enabler refs */
1020 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1021 &event
->enablers_ref_head
, node
)
1027 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1029 cds_list_del(&_enum
->node
);
1030 cds_hlist_del(&_enum
->hlist
);
1034 void lttng_ust_events_exit(void)
1036 struct lttng_session
*session
, *tmpsession
;
1038 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, node
)
1039 lttng_session_destroy(session
);
1043 * Enabler management.
1045 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1046 struct lttng_ust_event
*event_param
,
1047 struct lttng_channel
*chan
)
1049 struct lttng_enabler
*enabler
;
1051 enabler
= zmalloc(sizeof(*enabler
));
1054 enabler
->type
= type
;
1055 CDS_INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1056 CDS_INIT_LIST_HEAD(&enabler
->excluder_head
);
1057 memcpy(&enabler
->event_param
, event_param
,
1058 sizeof(enabler
->event_param
));
1059 enabler
->chan
= chan
;
1061 enabler
->enabled
= 0;
1062 cds_list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1063 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1067 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1069 enabler
->enabled
= 1;
1070 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1074 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1076 enabler
->enabled
= 0;
1077 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1081 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1082 struct lttng_ust_filter_bytecode_node
*bytecode
)
1084 bytecode
->enabler
= enabler
;
1085 cds_list_add_tail(&bytecode
->node
, &enabler
->filter_bytecode_head
);
1086 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1090 int lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1091 struct lttng_ust_excluder_node
*excluder
)
1093 excluder
->enabler
= enabler
;
1094 cds_list_add_tail(&excluder
->node
, &enabler
->excluder_head
);
1095 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1099 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1100 union ust_args
*uargs
,
1101 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1104 * We cannot attach a context after trace has been started for a
1105 * session because the metadata does not allow expressing this
1106 * information outside of the original channel scope.
1108 if (session
->been_active
)
1111 switch (context_param
->ctx
) {
1112 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1113 return lttng_add_pthread_id_to_ctx(ctx
);
1114 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1116 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1118 perf_ctx_param
= &context_param
->u
.perf_counter
;
1119 return lttng_add_perf_counter_to_ctx(
1120 perf_ctx_param
->type
,
1121 perf_ctx_param
->config
,
1122 perf_ctx_param
->name
,
1125 case LTTNG_UST_CONTEXT_VTID
:
1126 return lttng_add_vtid_to_ctx(ctx
);
1127 case LTTNG_UST_CONTEXT_VPID
:
1128 return lttng_add_vpid_to_ctx(ctx
);
1129 case LTTNG_UST_CONTEXT_PROCNAME
:
1130 return lttng_add_procname_to_ctx(ctx
);
1131 case LTTNG_UST_CONTEXT_IP
:
1132 return lttng_add_ip_to_ctx(ctx
);
1133 case LTTNG_UST_CONTEXT_CPU_ID
:
1134 return lttng_add_cpu_id_to_ctx(ctx
);
1135 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1136 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1138 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1139 return lttng_add_cgroup_ns_to_ctx(ctx
);
1140 case LTTNG_UST_CONTEXT_IPC_NS
:
1141 return lttng_add_ipc_ns_to_ctx(ctx
);
1142 case LTTNG_UST_CONTEXT_MNT_NS
:
1143 return lttng_add_mnt_ns_to_ctx(ctx
);
1144 case LTTNG_UST_CONTEXT_NET_NS
:
1145 return lttng_add_net_ns_to_ctx(ctx
);
1146 case LTTNG_UST_CONTEXT_PID_NS
:
1147 return lttng_add_pid_ns_to_ctx(ctx
);
1148 case LTTNG_UST_CONTEXT_USER_NS
:
1149 return lttng_add_user_ns_to_ctx(ctx
);
1150 case LTTNG_UST_CONTEXT_UTS_NS
:
1151 return lttng_add_uts_ns_to_ctx(ctx
);
1152 case LTTNG_UST_CONTEXT_VUID
:
1153 return lttng_add_vuid_to_ctx(ctx
);
1154 case LTTNG_UST_CONTEXT_VEUID
:
1155 return lttng_add_veuid_to_ctx(ctx
);
1156 case LTTNG_UST_CONTEXT_VSUID
:
1157 return lttng_add_vsuid_to_ctx(ctx
);
1158 case LTTNG_UST_CONTEXT_VGID
:
1159 return lttng_add_vgid_to_ctx(ctx
);
1160 case LTTNG_UST_CONTEXT_VEGID
:
1161 return lttng_add_vegid_to_ctx(ctx
);
1162 case LTTNG_UST_CONTEXT_VSGID
:
1163 return lttng_add_vsgid_to_ctx(ctx
);
1169 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1170 struct lttng_ust_context
*context_param
)
1172 #if 0 // disabled for now.
1173 struct lttng_session
*session
= enabler
->chan
->session
;
1176 ret
= lttng_attach_context(context_param
, &enabler
->ctx
,
1180 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1186 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1188 struct lttng_ust_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1189 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
1191 /* Destroy filter bytecode */
1192 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1193 &enabler
->filter_bytecode_head
, node
) {
1197 /* Destroy excluders */
1198 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
1199 &enabler
->excluder_head
, node
) {
1200 free(excluder_node
);
1203 /* Destroy contexts */
1204 lttng_destroy_context(enabler
->ctx
);
1206 cds_list_del(&enabler
->node
);
1211 * lttng_session_sync_enablers should be called just before starting a
1215 void lttng_session_sync_enablers(struct lttng_session
*session
)
1217 struct lttng_enabler
*enabler
;
1218 struct lttng_event
*event
;
1220 cds_list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1221 lttng_enabler_ref_events(enabler
);
1223 * For each event, if at least one of its enablers is enabled,
1224 * and its channel and session transient states are enabled, we
1225 * enable the event, else we disable it.
1227 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1228 struct lttng_enabler_ref
*enabler_ref
;
1229 struct lttng_bytecode_runtime
*runtime
;
1230 int enabled
= 0, has_enablers_without_bytecode
= 0;
1233 cds_list_for_each_entry(enabler_ref
,
1234 &event
->enablers_ref_head
, node
) {
1235 if (enabler_ref
->ref
->enabled
) {
1241 * Enabled state is based on union of enablers, with
1242 * intesection of session and channel transient enable
1245 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1247 CMM_STORE_SHARED(event
->enabled
, enabled
);
1249 * Sync tracepoint registration with event enabled
1253 if (!event
->registered
)
1254 register_event(event
);
1256 if (event
->registered
)
1257 unregister_event(event
);
1260 /* Check if has enablers without bytecode enabled */
1261 cds_list_for_each_entry(enabler_ref
,
1262 &event
->enablers_ref_head
, node
) {
1263 if (enabler_ref
->ref
->enabled
1264 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1265 has_enablers_without_bytecode
= 1;
1269 event
->has_enablers_without_bytecode
=
1270 has_enablers_without_bytecode
;
1272 /* Enable filters */
1273 cds_list_for_each_entry(runtime
,
1274 &event
->bytecode_runtime_head
, node
) {
1275 lttng_filter_sync_state(runtime
);
1278 __tracepoint_probe_prune_release_queue();
1282 * Apply enablers to session events, adding events to session if need
1283 * be. It is required after each modification applied to an active
1284 * session, and right before session "start".
1285 * "lazy" sync means we only sync if required.
1288 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1290 /* We can skip if session is not active */
1291 if (!session
->active
)
1293 lttng_session_sync_enablers(session
);
1297 * Update all sessions with the given app context.
1298 * Called with ust lock held.
1299 * This is invoked when an application context gets loaded/unloaded. It
1300 * ensures the context callbacks are in sync with the application
1301 * context (either app context callbacks, or dummy callbacks).
1303 void lttng_ust_context_set_session_provider(const char *name
,
1304 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1305 void (*record
)(struct lttng_ctx_field
*field
,
1306 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1307 struct lttng_channel
*chan
),
1308 void (*get_value
)(struct lttng_ctx_field
*field
,
1309 struct lttng_ctx_value
*value
))
1311 struct lttng_session
*session
;
1313 cds_list_for_each_entry(session
, &sessions
, node
) {
1314 struct lttng_channel
*chan
;
1315 struct lttng_event
*event
;
1318 ret
= lttng_ust_context_set_provider_rcu(&session
->ctx
,
1319 name
, get_size
, record
, get_value
);
1322 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
1323 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1324 name
, get_size
, record
, get_value
);
1328 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1329 ret
= lttng_ust_context_set_provider_rcu(&event
->ctx
,
1330 name
, get_size
, record
, get_value
);