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 "common/logging.h"
36 #include "common/macros.h"
37 #include <lttng/ust-ctl.h>
38 #include "common/ustcomm.h"
39 #include "common/ust-fd.h"
40 #include "common/dynamic-type.h"
41 #include "common/ust-context-provider.h"
42 #include "lttng-ust-uuid.h"
44 #include "common/tracepoint.h"
45 #include "common/strutils.h"
46 #include "lttng-bytecode.h"
47 #include "lttng-tracer.h"
48 #include "lttng-tracer-core.h"
49 #include "lttng-ust-statedump.h"
50 #include "context-internal.h"
51 #include "lib/lttng-ust/events.h"
52 #include "common/ringbuffer/shm.h"
53 #include "common/ringbuffer/frontend_types.h"
54 #include "common/ringbuffer/frontend.h"
55 #include "common/counter/counter.h"
56 #include "common/jhash.h"
57 #include <lttng/ust-abi.h>
58 #include "context-provider-internal.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_ust_event_common
*event
);
74 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
77 void lttng_session_lazy_sync_event_enablers(struct lttng_ust_session
*session
);
79 void lttng_session_sync_event_enablers(struct lttng_ust_session
*session
);
81 void lttng_event_notifier_group_sync_enablers(
82 struct lttng_event_notifier_group
*event_notifier_group
);
84 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
86 bool lttng_ust_validate_event_name(const struct lttng_ust_event_desc
*desc
)
88 if (strlen(desc
->probe_desc
->provider_name
) + 1 +
89 strlen(desc
->event_name
) >= LTTNG_UST_ABI_SYM_NAME_LEN
)
94 void lttng_ust_format_event_name(const struct lttng_ust_event_desc
*desc
,
97 strcpy(name
, desc
->probe_desc
->provider_name
);
99 strcat(name
, desc
->event_name
);
103 * Called with ust lock held.
105 int lttng_session_active(void)
107 struct lttng_ust_session_private
*iter
;
109 cds_list_for_each_entry(iter
, &sessions
, node
) {
110 if (iter
->pub
->active
)
117 int lttng_loglevel_match(int loglevel
,
118 unsigned int has_loglevel
,
119 enum lttng_ust_abi_loglevel_type req_type
,
123 loglevel
= TRACE_DEFAULT
;
125 case LTTNG_UST_ABI_LOGLEVEL_RANGE
:
126 if (loglevel
<= req_loglevel
127 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
131 case LTTNG_UST_ABI_LOGLEVEL_SINGLE
:
132 if (loglevel
== req_loglevel
133 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
137 case LTTNG_UST_ABI_LOGLEVEL_ALL
:
139 if (loglevel
<= TRACE_DEBUG
)
146 struct lttng_ust_session
*lttng_session_create(void)
148 struct lttng_ust_session
*session
;
149 struct lttng_ust_session_private
*session_priv
;
152 session
= zmalloc(sizeof(struct lttng_ust_session
));
155 session
->struct_size
= sizeof(struct lttng_ust_session
);
156 session_priv
= zmalloc(sizeof(struct lttng_ust_session_private
));
161 session
->priv
= session_priv
;
162 session_priv
->pub
= session
;
163 if (lttng_context_init_all(&session
->priv
->ctx
)) {
168 CDS_INIT_LIST_HEAD(&session
->priv
->chan_head
);
169 CDS_INIT_LIST_HEAD(&session
->priv
->events_head
);
170 CDS_INIT_LIST_HEAD(&session
->priv
->enums_head
);
171 CDS_INIT_LIST_HEAD(&session
->priv
->enablers_head
);
172 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
173 CDS_INIT_HLIST_HEAD(&session
->priv
->events_ht
.table
[i
]);
174 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
175 CDS_INIT_HLIST_HEAD(&session
->priv
->enums_ht
.table
[i
]);
176 cds_list_add(&session
->priv
->node
, &sessions
);
180 struct lttng_counter
*lttng_ust_counter_create(
181 const char *counter_transport_name
,
182 size_t number_dimensions
, const struct lttng_counter_dimension
*dimensions
)
184 struct lttng_counter_transport
*counter_transport
= NULL
;
185 struct lttng_counter
*counter
= NULL
;
187 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
188 if (!counter_transport
)
190 counter
= zmalloc(sizeof(struct lttng_counter
));
194 counter
->ops
= &counter_transport
->ops
;
195 counter
->transport
= counter_transport
;
197 counter
->counter
= counter
->ops
->counter_create(
198 number_dimensions
, dimensions
, 0,
200 if (!counter
->counter
) {
214 void lttng_ust_counter_destroy(struct lttng_counter
*counter
)
216 counter
->ops
->counter_destroy(counter
->counter
);
220 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
222 struct lttng_event_notifier_group
*event_notifier_group
;
225 event_notifier_group
= zmalloc(sizeof(struct lttng_event_notifier_group
));
226 if (!event_notifier_group
)
229 /* Add all contexts. */
230 if (lttng_context_init_all(&event_notifier_group
->ctx
)) {
231 free(event_notifier_group
);
235 CDS_INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
236 CDS_INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
237 for (i
= 0; i
< LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
; i
++)
238 CDS_INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
240 cds_list_add(&event_notifier_group
->node
, &event_notifier_groups
);
242 return event_notifier_group
;
246 * Only used internally at session destruction.
249 void _lttng_channel_unmap(struct lttng_ust_channel_buffer
*lttng_chan
)
251 struct lttng_ust_ring_buffer_channel
*chan
;
252 struct lttng_ust_shm_handle
*handle
;
254 cds_list_del(<tng_chan
->priv
->node
);
255 lttng_destroy_context(lttng_chan
->priv
->ctx
);
256 chan
= lttng_chan
->priv
->rb_chan
;
257 handle
= chan
->handle
;
258 channel_destroy(chan
, handle
, 0);
259 free(lttng_chan
->parent
);
260 free(lttng_chan
->priv
);
265 void register_event(struct lttng_ust_event_common
*event
)
268 const struct lttng_ust_event_desc
*desc
;
269 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
271 assert(event
->priv
->registered
== 0);
272 desc
= event
->priv
->desc
;
273 lttng_ust_format_event_name(desc
, name
);
274 ret
= lttng_ust_tp_probe_register_queue_release(name
,
275 desc
->probe_callback
,
276 event
, desc
->signature
);
279 event
->priv
->registered
= 1;
283 void unregister_event(struct lttng_ust_event_common
*event
)
286 const struct lttng_ust_event_desc
*desc
;
287 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
289 assert(event
->priv
->registered
== 1);
290 desc
= event
->priv
->desc
;
291 lttng_ust_format_event_name(desc
, name
);
292 ret
= lttng_ust_tp_probe_unregister_queue_release(name
,
293 desc
->probe_callback
,
297 event
->priv
->registered
= 0;
301 void _lttng_event_unregister(struct lttng_ust_event_common
*event
)
303 if (event
->priv
->registered
)
304 unregister_event(event
);
307 void lttng_session_destroy(struct lttng_ust_session
*session
)
309 struct lttng_ust_channel_buffer_private
*chan
, *tmpchan
;
310 struct lttng_ust_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
311 struct lttng_enum
*_enum
, *tmp_enum
;
312 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
314 CMM_ACCESS_ONCE(session
->active
) = 0;
315 cds_list_for_each_entry(event_recorder_priv
, &session
->priv
->events_head
, node
) {
316 _lttng_event_unregister(event_recorder_priv
->parent
.pub
);
318 lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */
319 lttng_ust_tp_probe_prune_release_queue();
320 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
321 &session
->priv
->enablers_head
, node
)
322 lttng_event_enabler_destroy(event_enabler
);
323 cds_list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
,
324 &session
->priv
->events_head
, node
)
325 _lttng_event_destroy(event_recorder_priv
->parent
.pub
);
326 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
327 &session
->priv
->enums_head
, node
)
328 _lttng_enum_destroy(_enum
);
329 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->priv
->chan_head
, node
)
330 _lttng_channel_unmap(chan
->pub
);
331 cds_list_del(&session
->priv
->node
);
332 lttng_destroy_context(session
->priv
->ctx
);
337 void lttng_event_notifier_group_destroy(
338 struct lttng_event_notifier_group
*event_notifier_group
)
341 struct lttng_event_notifier_enabler
*notifier_enabler
, *tmpnotifier_enabler
;
342 struct lttng_ust_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
344 if (!event_notifier_group
) {
348 cds_list_for_each_entry(event_notifier_priv
,
349 &event_notifier_group
->event_notifiers_head
, node
)
350 _lttng_event_unregister(event_notifier_priv
->parent
.pub
);
352 lttng_ust_urcu_synchronize_rcu();
354 cds_list_for_each_entry_safe(notifier_enabler
, tmpnotifier_enabler
,
355 &event_notifier_group
->enablers_head
, node
)
356 lttng_event_notifier_enabler_destroy(notifier_enabler
);
358 cds_list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
359 &event_notifier_group
->event_notifiers_head
, node
)
360 _lttng_event_destroy(event_notifier_priv
->parent
.pub
);
362 if (event_notifier_group
->error_counter
)
363 lttng_ust_counter_destroy(event_notifier_group
->error_counter
);
365 /* Close the notification fd to the listener of event_notifiers. */
367 lttng_ust_lock_fd_tracker();
368 close_ret
= close(event_notifier_group
->notification_fd
);
370 lttng_ust_delete_fd_from_tracker(
371 event_notifier_group
->notification_fd
);
376 lttng_ust_unlock_fd_tracker();
378 cds_list_del(&event_notifier_group
->node
);
379 lttng_destroy_context(event_notifier_group
->ctx
);
380 free(event_notifier_group
);
384 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
386 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
387 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
393 /* Destroy filter bytecode */
394 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
395 &enabler
->filter_bytecode_head
, node
) {
399 /* Destroy excluders */
400 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
401 &enabler
->excluder_head
, node
) {
406 void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
408 if (!event_notifier_enabler
) {
412 cds_list_del(&event_notifier_enabler
->node
);
414 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
416 free(event_notifier_enabler
);
420 int lttng_enum_create(const struct lttng_ust_enum_desc
*desc
,
421 struct lttng_ust_session
*session
)
423 const char *enum_name
= desc
->name
;
424 struct lttng_enum
*_enum
;
425 struct cds_hlist_head
*head
;
427 size_t name_len
= strlen(enum_name
);
431 /* Check if this enum is already registered for this session. */
432 hash
= jhash(enum_name
, name_len
, 0);
433 head
= &session
->priv
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
435 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
441 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
442 if (notify_socket
< 0) {
447 _enum
= zmalloc(sizeof(*_enum
));
452 _enum
->session
= session
;
455 ret
= ustcomm_register_enum(notify_socket
,
462 DBG("Error (%d) registering enumeration to sessiond", ret
);
463 goto sessiond_register_error
;
465 cds_list_add(&_enum
->node
, &session
->priv
->enums_head
);
466 cds_hlist_add_head(&_enum
->hlist
, head
);
469 sessiond_register_error
:
478 int lttng_create_enum_check(const struct lttng_ust_type_common
*type
,
479 struct lttng_ust_session
*session
)
481 switch (type
->type
) {
482 case lttng_ust_type_enum
:
484 const struct lttng_ust_enum_desc
*enum_desc
;
487 enum_desc
= lttng_ust_get_type_enum(type
)->desc
;
488 ret
= lttng_enum_create(enum_desc
, session
);
489 if (ret
&& ret
!= -EEXIST
) {
490 DBG("Unable to create enum error: (%d)", ret
);
495 case lttng_ust_type_dynamic
:
497 const struct lttng_ust_event_field
*tag_field_generic
;
498 const struct lttng_ust_enum_desc
*enum_desc
;
501 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
502 enum_desc
= lttng_ust_get_type_enum(tag_field_generic
->type
)->desc
;
503 ret
= lttng_enum_create(enum_desc
, session
);
504 if (ret
&& ret
!= -EEXIST
) {
505 DBG("Unable to create enum error: (%d)", ret
);
511 /* TODO: nested types when they become supported. */
518 int lttng_create_all_event_enums(size_t nr_fields
,
519 const struct lttng_ust_event_field
* const *event_fields
,
520 struct lttng_ust_session
*session
)
525 /* For each field, ensure enum is part of the session. */
526 for (i
= 0; i
< nr_fields
; i
++) {
527 const struct lttng_ust_type_common
*type
= event_fields
[i
]->type
;
529 ret
= lttng_create_enum_check(type
, session
);
537 int lttng_create_all_ctx_enums(size_t nr_fields
,
538 struct lttng_ust_ctx_field
*ctx_fields
,
539 struct lttng_ust_session
*session
)
544 /* For each field, ensure enum is part of the session. */
545 for (i
= 0; i
< nr_fields
; i
++) {
546 const struct lttng_ust_type_common
*type
= ctx_fields
[i
].event_field
->type
;
548 ret
= lttng_create_enum_check(type
, session
);
556 * Ensure that a state-dump will be performed for this session at the end
557 * of the current handle_message().
559 int lttng_session_statedump(struct lttng_ust_session
*session
)
561 session
->priv
->statedump_pending
= 1;
562 lttng_ust_sockinfo_session_enabled(session
->priv
->owner
);
566 int lttng_session_enable(struct lttng_ust_session
*session
)
569 struct lttng_ust_channel_buffer_private
*chan
;
572 if (session
->active
) {
577 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
578 if (notify_socket
< 0)
579 return notify_socket
;
581 /* Set transient enabler state to "enabled" */
582 session
->priv
->tstate
= 1;
584 /* We need to sync enablers with session before activation. */
585 lttng_session_sync_event_enablers(session
);
588 * Snapshot the number of events per channel to know the type of header
591 cds_list_for_each_entry(chan
, &session
->priv
->chan_head
, node
) {
592 struct lttng_ust_ctx
*ctx
;
593 struct lttng_ust_ctx_field
*fields
= NULL
;
594 size_t nr_fields
= 0;
597 /* don't change it if session stop/restart */
598 if (chan
->header_type
)
602 nr_fields
= ctx
->nr_fields
;
603 fields
= ctx
->fields
;
604 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
607 DBG("Error (%d) adding enum to session", ret
);
611 ret
= ustcomm_register_channel(notify_socket
,
620 DBG("Error (%d) registering channel to sessiond", ret
);
623 if (chan_id
!= chan
->id
) {
624 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
630 /* Set atomically the state to "active" */
631 CMM_ACCESS_ONCE(session
->active
) = 1;
632 CMM_ACCESS_ONCE(session
->priv
->been_active
) = 1;
634 ret
= lttng_session_statedump(session
);
641 int lttng_session_disable(struct lttng_ust_session
*session
)
645 if (!session
->active
) {
649 /* Set atomically the state to "inactive" */
650 CMM_ACCESS_ONCE(session
->active
) = 0;
652 /* Set transient enabler state to "disabled" */
653 session
->priv
->tstate
= 0;
654 lttng_session_sync_event_enablers(session
);
659 int lttng_channel_enable(struct lttng_ust_channel_common
*lttng_channel
)
663 if (lttng_channel
->enabled
) {
667 /* Set transient enabler state to "enabled" */
668 lttng_channel
->priv
->tstate
= 1;
669 lttng_session_sync_event_enablers(lttng_channel
->session
);
670 /* Set atomically the state to "enabled" */
671 CMM_ACCESS_ONCE(lttng_channel
->enabled
) = 1;
676 int lttng_channel_disable(struct lttng_ust_channel_common
*lttng_channel
)
680 if (!lttng_channel
->enabled
) {
684 /* Set atomically the state to "disabled" */
685 CMM_ACCESS_ONCE(lttng_channel
->enabled
) = 0;
686 /* Set transient enabler state to "enabled" */
687 lttng_channel
->priv
->tstate
= 0;
688 lttng_session_sync_event_enablers(lttng_channel
->session
);
694 struct cds_hlist_head
*borrow_hash_table_bucket(
695 struct cds_hlist_head
*hash_table
,
696 unsigned int hash_table_size
,
697 const struct lttng_ust_event_desc
*desc
)
699 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
703 lttng_ust_format_event_name(desc
, name
);
704 name_len
= strlen(name
);
706 hash
= jhash(name
, name_len
, 0);
707 return &hash_table
[hash
& (hash_table_size
- 1)];
711 * Supports event creation while tracing session is active.
714 int lttng_event_recorder_create(const struct lttng_ust_event_desc
*desc
,
715 struct lttng_ust_channel_buffer
*chan
)
717 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
718 struct lttng_ust_event_recorder
*event_recorder
;
719 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
720 struct lttng_ust_session
*session
= chan
->parent
->session
;
721 struct cds_hlist_head
*head
;
723 int notify_socket
, loglevel
;
726 head
= borrow_hash_table_bucket(chan
->parent
->session
->priv
->events_ht
.table
,
727 LTTNG_UST_EVENT_HT_SIZE
, desc
);
729 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
730 if (notify_socket
< 0) {
735 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
738 DBG("Error (%d) adding enum to session", ret
);
739 goto create_enum_error
;
743 * Check if loglevel match. Refuse to connect event if not.
745 event_recorder
= zmalloc(sizeof(struct lttng_ust_event_recorder
));
746 if (!event_recorder
) {
750 event_recorder
->struct_size
= sizeof(struct lttng_ust_event_recorder
);
752 event_recorder
->parent
= zmalloc(sizeof(struct lttng_ust_event_common
));
753 if (!event_recorder
->parent
) {
757 event_recorder
->parent
->struct_size
= sizeof(struct lttng_ust_event_common
);
758 event_recorder
->parent
->type
= LTTNG_UST_EVENT_TYPE_RECORDER
;
759 event_recorder
->parent
->child
= event_recorder
;
761 event_recorder_priv
= zmalloc(sizeof(struct lttng_ust_event_recorder_private
));
762 if (!event_recorder_priv
) {
766 event_recorder
->priv
= event_recorder_priv
;
767 event_recorder_priv
->pub
= event_recorder
;
768 event_recorder
->parent
->priv
= &event_recorder_priv
->parent
;
769 event_recorder_priv
->parent
.pub
= event_recorder
->parent
;
771 event_recorder
->chan
= chan
;
773 /* Event will be enabled by enabler sync. */
774 event_recorder
->parent
->run_filter
= lttng_ust_interpret_event_filter
;
775 event_recorder
->parent
->enabled
= 0;
776 event_recorder
->parent
->priv
->registered
= 0;
777 CDS_INIT_LIST_HEAD(&event_recorder
->parent
->priv
->filter_bytecode_runtime_head
);
778 CDS_INIT_LIST_HEAD(&event_recorder
->parent
->priv
->enablers_ref_head
);
779 event_recorder
->parent
->priv
->desc
= desc
;
782 loglevel
= *(*desc
->loglevel
);
784 loglevel
= TRACE_DEFAULT
;
785 if (desc
->model_emf_uri
)
786 uri
= *(desc
->model_emf_uri
);
790 lttng_ust_format_event_name(desc
, name
);
792 /* Fetch event ID from sessiond */
793 ret
= ustcomm_register_event(notify_socket
,
796 chan
->priv
->parent
.objd
,
803 &event_recorder
->priv
->id
);
805 DBG("Error (%d) registering event to sessiond", ret
);
806 goto sessiond_register_error
;
809 cds_list_add(&event_recorder_priv
->node
, &chan
->parent
->session
->priv
->events_head
);
810 cds_hlist_add_head(&event_recorder_priv
->hlist
, head
);
813 sessiond_register_error
:
814 free(event_recorder_priv
);
816 free(event_recorder
->parent
);
818 free(event_recorder
);
826 int lttng_event_notifier_create(const struct lttng_ust_event_desc
*desc
,
827 uint64_t token
, uint64_t error_counter_index
,
828 struct lttng_event_notifier_group
*event_notifier_group
)
830 struct lttng_ust_event_notifier
*event_notifier
;
831 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
832 struct cds_hlist_head
*head
;
836 * Get the hashtable bucket the created lttng_event_notifier object
837 * should be inserted.
839 head
= borrow_hash_table_bucket(
840 event_notifier_group
->event_notifiers_ht
.table
,
841 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
843 event_notifier
= zmalloc(sizeof(struct lttng_ust_event_notifier
));
844 if (!event_notifier
) {
848 event_notifier
->struct_size
= sizeof(struct lttng_ust_event_notifier
);
850 event_notifier
->parent
= zmalloc(sizeof(struct lttng_ust_event_common
));
851 if (!event_notifier
->parent
) {
855 event_notifier
->parent
->struct_size
= sizeof(struct lttng_ust_event_common
);
856 event_notifier
->parent
->type
= LTTNG_UST_EVENT_TYPE_NOTIFIER
;
857 event_notifier
->parent
->child
= event_notifier
;
859 event_notifier_priv
= zmalloc(sizeof(struct lttng_ust_event_notifier_private
));
860 if (!event_notifier_priv
) {
864 event_notifier
->priv
= event_notifier_priv
;
865 event_notifier_priv
->pub
= event_notifier
;
866 event_notifier
->parent
->priv
= &event_notifier_priv
->parent
;
867 event_notifier_priv
->parent
.pub
= event_notifier
->parent
;
869 event_notifier_priv
->group
= event_notifier_group
;
870 event_notifier_priv
->parent
.user_token
= token
;
871 event_notifier_priv
->error_counter_index
= error_counter_index
;
873 /* Event notifier will be enabled by enabler sync. */
874 event_notifier
->parent
->run_filter
= lttng_ust_interpret_event_filter
;
875 event_notifier
->parent
->enabled
= 0;
876 event_notifier_priv
->parent
.registered
= 0;
878 CDS_INIT_LIST_HEAD(&event_notifier
->parent
->priv
->filter_bytecode_runtime_head
);
879 CDS_INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
880 CDS_INIT_LIST_HEAD(&event_notifier_priv
->parent
.enablers_ref_head
);
881 event_notifier_priv
->parent
.desc
= desc
;
882 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
884 cds_list_add(&event_notifier_priv
->node
,
885 &event_notifier_group
->event_notifiers_head
);
886 cds_hlist_add_head(&event_notifier_priv
->hlist
, head
);
891 free(event_notifier
->parent
);
893 free(event_notifier
);
899 int lttng_desc_match_star_glob_enabler(const struct lttng_ust_event_desc
*desc
,
900 struct lttng_enabler
*enabler
)
902 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
904 unsigned int has_loglevel
= 0;
906 lttng_ust_format_event_name(desc
, name
);
907 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
908 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
911 if (desc
->loglevel
) {
912 loglevel
= *(*desc
->loglevel
);
915 if (!lttng_loglevel_match(loglevel
,
917 enabler
->event_param
.loglevel_type
,
918 enabler
->event_param
.loglevel
))
924 int lttng_desc_match_event_enabler(const struct lttng_ust_event_desc
*desc
,
925 struct lttng_enabler
*enabler
)
927 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
929 unsigned int has_loglevel
= 0;
931 lttng_ust_format_event_name(desc
, name
);
932 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
933 if (strcmp(name
, enabler
->event_param
.name
))
935 if (desc
->loglevel
) {
936 loglevel
= *(*desc
->loglevel
);
939 if (!lttng_loglevel_match(loglevel
,
941 enabler
->event_param
.loglevel_type
,
942 enabler
->event_param
.loglevel
))
948 int lttng_desc_match_enabler(const struct lttng_ust_event_desc
*desc
,
949 struct lttng_enabler
*enabler
)
951 switch (enabler
->format_type
) {
952 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
954 struct lttng_ust_excluder_node
*excluder
;
956 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
961 * If the matching event matches with an excluder,
962 * return 'does not match'
964 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
967 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
971 excluder_name
= (char *) (excluder
->excluder
.names
)
972 + count
* LTTNG_UST_ABI_SYM_NAME_LEN
;
973 len
= strnlen(excluder_name
, LTTNG_UST_ABI_SYM_NAME_LEN
);
975 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
977 lttng_ust_format_event_name(desc
, name
);
978 if (strutils_star_glob_match(excluder_name
, len
, name
, SIZE_MAX
)) {
986 case LTTNG_ENABLER_FORMAT_EVENT
:
987 return lttng_desc_match_event_enabler(desc
, enabler
);
994 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
995 struct lttng_ust_event_recorder
*event_recorder
)
997 if (lttng_desc_match_enabler(event_recorder
->parent
->priv
->desc
,
998 lttng_event_enabler_as_enabler(event_enabler
))
999 && event_recorder
->chan
== event_enabler
->chan
)
1006 int lttng_event_notifier_enabler_match_event_notifier(
1007 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1008 struct lttng_ust_event_notifier
*event_notifier
)
1010 int desc_matches
= lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
,
1011 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1013 if (desc_matches
&& event_notifier
->priv
->group
== event_notifier_enabler
->group
&&
1014 event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->user_token
)
1021 struct lttng_enabler_ref
*lttng_enabler_ref(
1022 struct cds_list_head
*enabler_ref_list
,
1023 struct lttng_enabler
*enabler
)
1025 struct lttng_enabler_ref
*enabler_ref
;
1027 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
1028 if (enabler_ref
->ref
== enabler
)
1035 * Create struct lttng_event if it is missing and present in the list of
1036 * tracepoint probes.
1039 void lttng_create_event_recorder_if_missing(struct lttng_event_enabler
*event_enabler
)
1041 struct lttng_ust_session
*session
= event_enabler
->chan
->parent
->session
;
1042 struct lttng_ust_registered_probe
*reg_probe
;
1043 const struct lttng_ust_event_desc
*desc
;
1044 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1046 struct cds_list_head
*probe_list
;
1048 probe_list
= lttng_get_probe_list_head();
1050 * For each probe event, if we find that a probe event matches
1051 * our enabler, create an associated lttng_event if not
1054 cds_list_for_each_entry(reg_probe
, probe_list
, head
) {
1055 const struct lttng_ust_probe_desc
*probe_desc
= reg_probe
->desc
;
1057 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1060 struct cds_hlist_head
*head
;
1061 struct cds_hlist_node
*node
;
1063 desc
= probe_desc
->event_desc
[i
];
1064 if (!lttng_desc_match_enabler(desc
,
1065 lttng_event_enabler_as_enabler(event_enabler
)))
1068 head
= borrow_hash_table_bucket(
1069 session
->priv
->events_ht
.table
,
1070 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1072 cds_hlist_for_each_entry(event_recorder_priv
, node
, head
, hlist
) {
1073 if (event_recorder_priv
->parent
.desc
== desc
1074 && event_recorder_priv
->pub
->chan
== event_enabler
->chan
) {
1083 * We need to create an event for this
1086 ret
= lttng_event_recorder_create(probe_desc
->event_desc
[i
],
1087 event_enabler
->chan
);
1089 DBG("Unable to create event \"%s:%s\", error %d\n",
1090 probe_desc
->provider_name
,
1091 probe_desc
->event_desc
[i
]->event_name
, ret
);
1098 void probe_provider_event_for_each(const struct lttng_ust_probe_desc
*provider_desc
,
1099 void (*event_func
)(struct lttng_ust_event_common
*event
))
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_ust_event_desc
*event_desc
;
1114 struct lttng_event_notifier_group
*event_notifier_group
;
1115 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1116 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1117 struct lttng_ust_session_private
*session_priv
;
1118 struct cds_hlist_head
*head
;
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_recorder_priv
, node
, tmp_node
, head
, hlist
) {
1136 if (event_desc
== event_recorder_priv
->parent
.desc
) {
1137 event_func(event_recorder_priv
->parent
.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_priv
, node
, tmp_node
, head
, hlist
) {
1158 if (event_desc
== event_notifier_priv
->parent
.desc
) {
1159 event_func(event_notifier_priv
->parent
.pub
);
1168 void _event_enum_destroy(struct lttng_ust_event_common
*event
)
1171 switch (event
->type
) {
1172 case LTTNG_UST_EVENT_TYPE_RECORDER
:
1174 struct lttng_ust_event_recorder
*event_recorder
= event
->child
;
1175 struct lttng_ust_session
*session
= event_recorder
->chan
->parent
->session
;
1178 /* Destroy enums of the current event. */
1179 for (i
= 0; i
< event_recorder
->parent
->priv
->desc
->nr_fields
; i
++) {
1180 const struct lttng_ust_enum_desc
*enum_desc
;
1181 const struct lttng_ust_event_field
*field
;
1182 struct lttng_enum
*curr_enum
;
1184 field
= event_recorder
->parent
->priv
->desc
->fields
[i
];
1185 switch (field
->type
->type
) {
1186 case lttng_ust_type_enum
:
1187 enum_desc
= lttng_ust_get_type_enum(field
->type
)->desc
;
1193 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1195 _lttng_enum_destroy(curr_enum
);
1200 case LTTNG_UST_EVENT_TYPE_NOTIFIER
:
1205 /* Destroy event. */
1206 _lttng_event_destroy(event
);
1210 * Iterate over all the UST sessions to unregister and destroy all probes from
1211 * the probe provider descriptor received as argument. Must me called with the
1214 void lttng_probe_provider_unregister_events(
1215 const struct lttng_ust_probe_desc
*provider_desc
)
1218 * Iterate over all events in the probe provider descriptions and sessions
1219 * to queue the unregistration of the events.
1221 probe_provider_event_for_each(provider_desc
, _lttng_event_unregister
);
1223 /* Wait for grace period. */
1224 lttng_ust_urcu_synchronize_rcu();
1225 /* Prune the unregistration queue. */
1226 lttng_ust_tp_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
);
1236 * Create events associated with an event enabler (if not already present),
1237 * and add backward reference from the event to the enabler.
1240 int lttng_event_enabler_ref_event_recorders(struct lttng_event_enabler
*event_enabler
)
1242 struct lttng_ust_session
*session
= event_enabler
->chan
->parent
->session
;
1243 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1245 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1248 /* First ensure that probe events are created for this enabler. */
1249 lttng_create_event_recorder_if_missing(event_enabler
);
1251 /* For each event matching enabler in session event list. */
1252 cds_list_for_each_entry(event_recorder_priv
, &session
->priv
->events_head
, node
) {
1253 struct lttng_enabler_ref
*enabler_ref
;
1255 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder_priv
->pub
))
1258 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
1259 lttng_event_enabler_as_enabler(event_enabler
));
1262 * If no backward ref, create it.
1263 * Add backward ref from event to enabler.
1265 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1268 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1270 cds_list_add(&enabler_ref
->node
,
1271 &event_recorder_priv
->parent
.enablers_ref_head
);
1275 * Link filter bytecodes if not linked yet.
1277 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
1278 &session
->priv
->ctx
,
1279 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
1280 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1282 /* TODO: merge event context. */
1289 * Called at library load: connect the probe on all enablers matching
1291 * Called with session mutex held.
1293 int lttng_fix_pending_events(void)
1295 struct lttng_ust_session_private
*session_priv
;
1297 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1298 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
1303 int lttng_fix_pending_event_notifiers(void)
1305 struct lttng_event_notifier_group
*event_notifier_group
;
1307 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1308 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1314 * For each session of the owner thread, execute pending statedump.
1315 * Only dump state for the sessions owned by the caller thread, because
1316 * we don't keep ust_lock across the entire iteration.
1318 void lttng_handle_pending_statedump(void *owner
)
1320 struct lttng_ust_session_private
*session_priv
;
1322 /* Execute state dump */
1323 do_lttng_ust_statedump(owner
);
1325 /* Clear pending state dump */
1329 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1330 if (session_priv
->owner
!= owner
)
1332 if (!session_priv
->statedump_pending
)
1334 session_priv
->statedump_pending
= 0;
1342 void _lttng_event_destroy(struct lttng_ust_event_common
*event
)
1344 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1346 lttng_free_event_filter_runtime(event
);
1347 /* Free event enabler refs */
1348 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1349 &event
->priv
->enablers_ref_head
, node
)
1352 switch (event
->type
) {
1353 case LTTNG_UST_EVENT_TYPE_RECORDER
:
1355 struct lttng_ust_event_recorder
*event_recorder
= event
->child
;
1357 /* Remove from event list. */
1358 cds_list_del(&event_recorder
->priv
->node
);
1359 /* Remove from event hash table. */
1360 cds_hlist_del(&event_recorder
->priv
->hlist
);
1362 lttng_destroy_context(event_recorder
->priv
->ctx
);
1363 free(event_recorder
->parent
);
1364 free(event_recorder
->priv
);
1365 free(event_recorder
);
1368 case LTTNG_UST_EVENT_TYPE_NOTIFIER
:
1370 struct lttng_ust_event_notifier
*event_notifier
= event
->child
;
1372 /* Remove from event list. */
1373 cds_list_del(&event_notifier
->priv
->node
);
1374 /* Remove from event hash table. */
1375 cds_hlist_del(&event_notifier
->priv
->hlist
);
1377 free(event_notifier
->priv
);
1378 free(event_notifier
->parent
);
1379 free(event_notifier
);
1388 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1390 cds_list_del(&_enum
->node
);
1391 cds_hlist_del(&_enum
->hlist
);
1395 void lttng_ust_abi_events_exit(void)
1397 struct lttng_ust_session_private
*session_priv
, *tmpsession_priv
;
1399 cds_list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, node
)
1400 lttng_session_destroy(session_priv
->pub
);
1404 * Enabler management.
1406 struct lttng_event_enabler
*lttng_event_enabler_create(
1407 enum lttng_enabler_format_type format_type
,
1408 struct lttng_ust_abi_event
*event_param
,
1409 struct lttng_ust_channel_buffer
*chan
)
1411 struct lttng_event_enabler
*event_enabler
;
1413 event_enabler
= zmalloc(sizeof(*event_enabler
));
1416 event_enabler
->base
.format_type
= format_type
;
1417 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1418 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1419 memcpy(&event_enabler
->base
.event_param
, event_param
,
1420 sizeof(event_enabler
->base
.event_param
));
1421 event_enabler
->chan
= chan
;
1423 event_enabler
->base
.enabled
= 0;
1424 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->parent
->session
->priv
->enablers_head
);
1425 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1427 return event_enabler
;
1430 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1431 struct lttng_event_notifier_group
*event_notifier_group
,
1432 enum lttng_enabler_format_type format_type
,
1433 struct lttng_ust_abi_event_notifier
*event_notifier_param
)
1435 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1437 event_notifier_enabler
= zmalloc(sizeof(*event_notifier_enabler
));
1438 if (!event_notifier_enabler
)
1440 event_notifier_enabler
->base
.format_type
= format_type
;
1441 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1442 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
1443 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.excluder_head
);
1445 event_notifier_enabler
->user_token
= event_notifier_param
->event
.token
;
1446 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
1447 event_notifier_enabler
->num_captures
= 0;
1449 memcpy(&event_notifier_enabler
->base
.event_param
.name
,
1450 event_notifier_param
->event
.name
,
1451 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1452 event_notifier_enabler
->base
.event_param
.instrumentation
=
1453 event_notifier_param
->event
.instrumentation
;
1454 event_notifier_enabler
->base
.event_param
.loglevel
=
1455 event_notifier_param
->event
.loglevel
;
1456 event_notifier_enabler
->base
.event_param
.loglevel_type
=
1457 event_notifier_param
->event
.loglevel_type
;
1459 event_notifier_enabler
->base
.enabled
= 0;
1460 event_notifier_enabler
->group
= event_notifier_group
;
1462 cds_list_add(&event_notifier_enabler
->node
,
1463 &event_notifier_group
->enablers_head
);
1465 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1467 return event_notifier_enabler
;
1470 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1472 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1473 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1478 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1480 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1481 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1487 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1488 struct lttng_ust_bytecode_node
**bytecode
)
1490 (*bytecode
)->enabler
= enabler
;
1491 cds_list_add_tail(&(*bytecode
)->node
, &enabler
->filter_bytecode_head
);
1492 /* Take ownership of bytecode */
1496 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1497 struct lttng_ust_bytecode_node
**bytecode
)
1499 _lttng_enabler_attach_filter_bytecode(
1500 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1502 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1507 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1508 struct lttng_ust_excluder_node
**excluder
)
1510 (*excluder
)->enabler
= enabler
;
1511 cds_list_add_tail(&(*excluder
)->node
, &enabler
->excluder_head
);
1512 /* Take ownership of excluder */
1516 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1517 struct lttng_ust_excluder_node
**excluder
)
1519 _lttng_enabler_attach_exclusion(
1520 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1522 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1526 int lttng_event_notifier_enabler_enable(
1527 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1529 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
1530 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1535 int lttng_event_notifier_enabler_disable(
1536 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1538 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
1539 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1544 int lttng_event_notifier_enabler_attach_filter_bytecode(
1545 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1546 struct lttng_ust_bytecode_node
**bytecode
)
1548 _lttng_enabler_attach_filter_bytecode(
1549 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1552 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1556 int lttng_event_notifier_enabler_attach_capture_bytecode(
1557 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1558 struct lttng_ust_bytecode_node
**bytecode
)
1560 (*bytecode
)->enabler
= lttng_event_notifier_enabler_as_enabler(
1561 event_notifier_enabler
);
1562 cds_list_add_tail(&(*bytecode
)->node
,
1563 &event_notifier_enabler
->capture_bytecode_head
);
1564 /* Take ownership of bytecode */
1566 event_notifier_enabler
->num_captures
++;
1568 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1572 int lttng_event_notifier_enabler_attach_exclusion(
1573 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1574 struct lttng_ust_excluder_node
**excluder
)
1576 _lttng_enabler_attach_exclusion(
1577 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1580 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1584 int lttng_attach_context(struct lttng_ust_abi_context
*context_param
,
1585 union lttng_ust_abi_args
*uargs
,
1586 struct lttng_ust_ctx
**ctx
, struct lttng_ust_session
*session
)
1589 * We cannot attach a context after trace has been started for a
1590 * session because the metadata does not allow expressing this
1591 * information outside of the original channel scope.
1593 if (session
->priv
->been_active
)
1596 switch (context_param
->ctx
) {
1597 case LTTNG_UST_ABI_CONTEXT_PTHREAD_ID
:
1598 return lttng_add_pthread_id_to_ctx(ctx
);
1599 case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER
:
1601 struct lttng_ust_abi_perf_counter_ctx
*perf_ctx_param
;
1603 perf_ctx_param
= &context_param
->u
.perf_counter
;
1604 return lttng_add_perf_counter_to_ctx(
1605 perf_ctx_param
->type
,
1606 perf_ctx_param
->config
,
1607 perf_ctx_param
->name
,
1610 case LTTNG_UST_ABI_CONTEXT_VTID
:
1611 return lttng_add_vtid_to_ctx(ctx
);
1612 case LTTNG_UST_ABI_CONTEXT_VPID
:
1613 return lttng_add_vpid_to_ctx(ctx
);
1614 case LTTNG_UST_ABI_CONTEXT_PROCNAME
:
1615 return lttng_add_procname_to_ctx(ctx
);
1616 case LTTNG_UST_ABI_CONTEXT_IP
:
1617 return lttng_add_ip_to_ctx(ctx
);
1618 case LTTNG_UST_ABI_CONTEXT_CPU_ID
:
1619 return lttng_add_cpu_id_to_ctx(ctx
);
1620 case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT
:
1621 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1623 case LTTNG_UST_ABI_CONTEXT_CGROUP_NS
:
1624 return lttng_add_cgroup_ns_to_ctx(ctx
);
1625 case LTTNG_UST_ABI_CONTEXT_IPC_NS
:
1626 return lttng_add_ipc_ns_to_ctx(ctx
);
1627 case LTTNG_UST_ABI_CONTEXT_MNT_NS
:
1628 return lttng_add_mnt_ns_to_ctx(ctx
);
1629 case LTTNG_UST_ABI_CONTEXT_NET_NS
:
1630 return lttng_add_net_ns_to_ctx(ctx
);
1631 case LTTNG_UST_ABI_CONTEXT_PID_NS
:
1632 return lttng_add_pid_ns_to_ctx(ctx
);
1633 case LTTNG_UST_ABI_CONTEXT_TIME_NS
:
1634 return lttng_add_time_ns_to_ctx(ctx
);
1635 case LTTNG_UST_ABI_CONTEXT_USER_NS
:
1636 return lttng_add_user_ns_to_ctx(ctx
);
1637 case LTTNG_UST_ABI_CONTEXT_UTS_NS
:
1638 return lttng_add_uts_ns_to_ctx(ctx
);
1639 case LTTNG_UST_ABI_CONTEXT_VUID
:
1640 return lttng_add_vuid_to_ctx(ctx
);
1641 case LTTNG_UST_ABI_CONTEXT_VEUID
:
1642 return lttng_add_veuid_to_ctx(ctx
);
1643 case LTTNG_UST_ABI_CONTEXT_VSUID
:
1644 return lttng_add_vsuid_to_ctx(ctx
);
1645 case LTTNG_UST_ABI_CONTEXT_VGID
:
1646 return lttng_add_vgid_to_ctx(ctx
);
1647 case LTTNG_UST_ABI_CONTEXT_VEGID
:
1648 return lttng_add_vegid_to_ctx(ctx
);
1649 case LTTNG_UST_ABI_CONTEXT_VSGID
:
1650 return lttng_add_vsgid_to_ctx(ctx
);
1656 int lttng_event_enabler_attach_context(
1657 struct lttng_event_enabler
*enabler
__attribute__((unused
)),
1658 struct lttng_ust_abi_context
*context_param
__attribute__((unused
)))
1663 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1665 if (!event_enabler
) {
1668 cds_list_del(&event_enabler
->node
);
1670 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1672 lttng_destroy_context(event_enabler
->ctx
);
1673 free(event_enabler
);
1677 * lttng_session_sync_event_enablers should be called just before starting a
1681 void lttng_session_sync_event_enablers(struct lttng_ust_session
*session
)
1683 struct lttng_event_enabler
*event_enabler
;
1684 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1686 cds_list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
1687 lttng_event_enabler_ref_event_recorders(event_enabler
);
1689 * For each event, if at least one of its enablers is enabled,
1690 * and its channel and session transient states are enabled, we
1691 * enable the event, else we disable it.
1693 cds_list_for_each_entry(event_recorder_priv
, &session
->priv
->events_head
, node
) {
1694 struct lttng_enabler_ref
*enabler_ref
;
1695 struct lttng_ust_bytecode_runtime
*runtime
;
1696 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
1700 cds_list_for_each_entry(enabler_ref
,
1701 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
1702 if (enabler_ref
->ref
->enabled
) {
1708 * Enabled state is based on union of enablers, with
1709 * intesection of session and channel transient enable
1712 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder_priv
->pub
->chan
->priv
->parent
.tstate
;
1714 CMM_STORE_SHARED(event_recorder_priv
->pub
->parent
->enabled
, enabled
);
1716 * Sync tracepoint registration with event enabled
1720 if (!event_recorder_priv
->parent
.registered
)
1721 register_event(event_recorder_priv
->parent
.pub
);
1723 if (event_recorder_priv
->parent
.registered
)
1724 unregister_event(event_recorder_priv
->parent
.pub
);
1727 /* Check if has enablers without bytecode enabled */
1728 cds_list_for_each_entry(enabler_ref
,
1729 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
1730 if (enabler_ref
->ref
->enabled
1731 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1732 has_enablers_without_filter_bytecode
= 1;
1736 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
1737 has_enablers_without_filter_bytecode
;
1739 /* Enable filters */
1740 cds_list_for_each_entry(runtime
,
1741 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
1742 lttng_bytecode_sync_state(runtime
);
1745 CMM_STORE_SHARED(event_recorder_priv
->parent
.pub
->eval_filter
,
1746 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
1748 lttng_ust_tp_probe_prune_release_queue();
1751 /* Support for event notifier is introduced by probe provider major version 2. */
1753 bool lttng_ust_probe_supports_event_notifier(const struct lttng_ust_probe_desc
*probe_desc
)
1755 return probe_desc
->major
>= 2;
1759 void lttng_create_event_notifier_if_missing(
1760 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1762 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1763 struct lttng_ust_registered_probe
*reg_probe
;
1764 struct cds_list_head
*probe_list
;
1767 probe_list
= lttng_get_probe_list_head();
1769 cds_list_for_each_entry(reg_probe
, probe_list
, head
) {
1770 const struct lttng_ust_probe_desc
*probe_desc
= reg_probe
->desc
;
1772 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1775 const struct lttng_ust_event_desc
*desc
;
1776 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1777 struct cds_hlist_head
*head
;
1778 struct cds_hlist_node
*node
;
1780 desc
= probe_desc
->event_desc
[i
];
1782 if (!lttng_desc_match_enabler(desc
,
1783 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1787 * Given the current event_notifier group, get the bucket that
1788 * the target event_notifier would be if it was already
1791 head
= borrow_hash_table_bucket(
1792 event_notifier_group
->event_notifiers_ht
.table
,
1793 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
1795 cds_hlist_for_each_entry(event_notifier_priv
, node
, head
, hlist
) {
1797 * Check if event_notifier already exists by checking
1798 * if the event_notifier and enabler share the same
1799 * description and id.
1801 if (event_notifier_priv
->parent
.desc
== desc
&&
1802 event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->user_token
) {
1811 /* Check that the probe supports event notifiers, else report the error. */
1812 if (!lttng_ust_probe_supports_event_notifier(probe_desc
)) {
1813 ERR("Probe \"%s\" contains event \"%s:%s\" which matches an enabled event notifier, "
1814 "but its version (%u.%u) is too old and does not implement event notifiers. "
1815 "It needs to be recompiled against a newer version of LTTng-UST, otherwise "
1816 "this event will not generate any notification.",
1817 probe_desc
->provider_name
,
1818 probe_desc
->provider_name
, desc
->event_name
,
1824 * We need to create a event_notifier for this event probe.
1826 ret
= lttng_event_notifier_create(desc
,
1827 event_notifier_enabler
->user_token
,
1828 event_notifier_enabler
->error_counter_index
,
1829 event_notifier_group
);
1831 DBG("Unable to create event_notifier \"%s:%s\", error %d\n",
1832 probe_desc
->provider_name
,
1833 probe_desc
->event_desc
[i
]->event_name
, ret
);
1840 * Create event_notifiers associated with a event_notifier enabler (if not already present).
1843 int lttng_event_notifier_enabler_ref_event_notifiers(
1844 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1846 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1847 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1850 * Only try to create event_notifiers for enablers that are enabled, the user
1851 * might still be attaching filter or exclusion to the
1852 * event_notifier_enabler.
1854 if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
)
1857 /* First, ensure that probe event_notifiers are created for this enabler. */
1858 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
1860 /* Link the created event_notifier with its associated enabler. */
1861 cds_list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
1862 struct lttng_enabler_ref
*enabler_ref
;
1864 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier_priv
->pub
))
1867 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
1868 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1871 * If no backward ref, create it.
1872 * Add backward ref from event_notifier to enabler.
1874 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1878 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
1879 event_notifier_enabler
);
1880 cds_list_add(&enabler_ref
->node
,
1881 &event_notifier_priv
->parent
.enablers_ref_head
);
1885 * Link filter bytecodes if not linked yet.
1887 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
1888 &event_notifier_group
->ctx
,
1889 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
1890 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
1893 * Link capture bytecodes if not linked yet.
1895 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
1896 &event_notifier_group
->ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
1897 &event_notifier_enabler
->capture_bytecode_head
);
1899 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
1906 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
1908 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1909 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1911 cds_list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
1912 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
1915 * For each event_notifier, if at least one of its enablers is enabled,
1916 * we enable the event_notifier, else we disable it.
1918 cds_list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
1919 struct lttng_enabler_ref
*enabler_ref
;
1920 struct lttng_ust_bytecode_runtime
*runtime
;
1921 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
1922 int nr_filters
= 0, nr_captures
= 0;
1924 /* Enable event_notifiers */
1925 cds_list_for_each_entry(enabler_ref
,
1926 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
1927 if (enabler_ref
->ref
->enabled
) {
1933 CMM_STORE_SHARED(event_notifier_priv
->pub
->parent
->enabled
, enabled
);
1935 * Sync tracepoint registration with event_notifier enabled
1939 if (!event_notifier_priv
->parent
.registered
)
1940 register_event(event_notifier_priv
->parent
.pub
);
1942 if (event_notifier_priv
->parent
.registered
)
1943 unregister_event(event_notifier_priv
->parent
.pub
);
1946 /* Check if has enablers without bytecode enabled */
1947 cds_list_for_each_entry(enabler_ref
,
1948 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
1949 if (enabler_ref
->ref
->enabled
1950 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1951 has_enablers_without_filter_bytecode
= 1;
1955 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
1956 has_enablers_without_filter_bytecode
;
1958 /* Enable filters */
1959 cds_list_for_each_entry(runtime
,
1960 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
1961 lttng_bytecode_sync_state(runtime
);
1964 CMM_STORE_SHARED(event_notifier_priv
->parent
.pub
->eval_filter
,
1965 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
1967 /* Enable captures. */
1968 cds_list_for_each_entry(runtime
,
1969 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
1970 lttng_bytecode_sync_state(runtime
);
1973 CMM_STORE_SHARED(event_notifier_priv
->pub
->eval_capture
,
1976 lttng_ust_tp_probe_prune_release_queue();
1980 * Apply enablers to session events, adding events to session if need
1981 * be. It is required after each modification applied to an active
1982 * session, and right before session "start".
1983 * "lazy" sync means we only sync if required.
1986 void lttng_session_lazy_sync_event_enablers(struct lttng_ust_session
*session
)
1988 /* We can skip if session is not active */
1989 if (!session
->active
)
1991 lttng_session_sync_event_enablers(session
);
1995 * Update all sessions with the given app context.
1996 * Called with ust lock held.
1997 * This is invoked when an application context gets loaded/unloaded. It
1998 * ensures the context callbacks are in sync with the application
1999 * context (either app context callbacks, or dummy callbacks).
2001 void lttng_ust_context_set_session_provider(const char *name
,
2002 size_t (*get_size
)(void *priv
, size_t offset
),
2003 void (*record
)(void *priv
, struct lttng_ust_ring_buffer_ctx
*ctx
,
2004 struct lttng_ust_channel_buffer
*chan
),
2005 void (*get_value
)(void *priv
, struct lttng_ust_ctx_value
*value
),
2008 struct lttng_ust_session_private
*session_priv
;
2010 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
2011 struct lttng_ust_channel_buffer_private
*chan
;
2012 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
2015 ret
= lttng_ust_context_set_provider_rcu(&session_priv
->ctx
,
2016 name
, get_size
, record
, get_value
, priv
);
2019 cds_list_for_each_entry(chan
, &session_priv
->chan_head
, node
) {
2020 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
2021 name
, get_size
, record
, get_value
, priv
);
2025 cds_list_for_each_entry(event_recorder_priv
, &session_priv
->events_head
, node
) {
2026 ret
= lttng_ust_context_set_provider_rcu(&event_recorder_priv
->ctx
,
2027 name
, get_size
, record
, get_value
, priv
);
2035 * Update all event_notifier groups with the given app context.
2036 * Called with ust lock held.
2037 * This is invoked when an application context gets loaded/unloaded. It
2038 * ensures the context callbacks are in sync with the application
2039 * context (either app context callbacks, or dummy callbacks).
2041 void lttng_ust_context_set_event_notifier_group_provider(const char *name
,
2042 size_t (*get_size
)(void *priv
, size_t offset
),
2043 void (*record
)(void *priv
, struct lttng_ust_ring_buffer_ctx
*ctx
,
2044 struct lttng_ust_channel_buffer
*chan
),
2045 void (*get_value
)(void *priv
, struct lttng_ust_ctx_value
*value
),
2048 struct lttng_event_notifier_group
*event_notifier_group
;
2050 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2053 ret
= lttng_ust_context_set_provider_rcu(
2054 &event_notifier_group
->ctx
,
2055 name
, get_size
, record
, get_value
, priv
);
2061 int lttng_ust_session_uuid_validate(struct lttng_ust_session
*session
,
2062 unsigned char *uuid
)
2066 /* Compare UUID with session. */
2067 if (session
->priv
->uuid_set
) {
2068 if (memcmp(session
->priv
->uuid
, uuid
, LTTNG_UST_UUID_LEN
)) {
2072 memcpy(session
->priv
->uuid
, uuid
, LTTNG_UST_UUID_LEN
);
2073 session
->priv
->uuid_set
= true;