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"
53 #include "common/ringbuffer/shm.h"
54 #include "common/ringbuffer/frontend_types.h"
55 #include "common/ringbuffer/frontend.h"
56 #include "common/counter/counter.h"
57 #include "common/jhash.h"
58 #include <lttng/ust-abi.h>
59 #include "context-provider-internal.h"
62 * All operations within this file are called by the communication
63 * thread, under ust_lock protection.
66 static CDS_LIST_HEAD(sessions
);
67 static CDS_LIST_HEAD(event_notifier_groups
);
69 struct cds_list_head
*lttng_get_sessions(void)
74 static void _lttng_event_destroy(struct lttng_ust_event_common
*event
);
75 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
78 void lttng_session_lazy_sync_event_enablers(struct lttng_ust_session
*session
);
80 void lttng_session_sync_event_enablers(struct lttng_ust_session
*session
);
82 void lttng_event_notifier_group_sync_enablers(
83 struct lttng_event_notifier_group
*event_notifier_group
);
85 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
87 bool lttng_ust_validate_event_name(const struct lttng_ust_event_desc
*desc
)
89 if (strlen(desc
->probe_desc
->provider_name
) + 1 +
90 strlen(desc
->event_name
) >= LTTNG_UST_ABI_SYM_NAME_LEN
)
95 void lttng_ust_format_event_name(const struct lttng_ust_event_desc
*desc
,
98 strcpy(name
, desc
->probe_desc
->provider_name
);
100 strcat(name
, desc
->event_name
);
104 * Called with ust lock held.
106 int lttng_session_active(void)
108 struct lttng_ust_session_private
*iter
;
110 cds_list_for_each_entry(iter
, &sessions
, node
) {
111 if (iter
->pub
->active
)
118 int lttng_loglevel_match(int loglevel
,
119 unsigned int has_loglevel
,
120 enum lttng_ust_abi_loglevel_type req_type
,
124 loglevel
= TRACE_DEFAULT
;
126 case LTTNG_UST_ABI_LOGLEVEL_RANGE
:
127 if (loglevel
<= req_loglevel
128 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
132 case LTTNG_UST_ABI_LOGLEVEL_SINGLE
:
133 if (loglevel
== req_loglevel
134 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
138 case LTTNG_UST_ABI_LOGLEVEL_ALL
:
140 if (loglevel
<= TRACE_DEBUG
)
147 struct lttng_ust_session
*lttng_session_create(void)
149 struct lttng_ust_session
*session
;
150 struct lttng_ust_session_private
*session_priv
;
153 session
= zmalloc(sizeof(struct lttng_ust_session
));
156 session
->struct_size
= sizeof(struct lttng_ust_session
);
157 session_priv
= zmalloc(sizeof(struct lttng_ust_session_private
));
162 session
->priv
= session_priv
;
163 session_priv
->pub
= session
;
164 if (lttng_context_init_all(&session
->priv
->ctx
)) {
169 CDS_INIT_LIST_HEAD(&session
->priv
->chan_head
);
170 CDS_INIT_LIST_HEAD(&session
->priv
->events_head
);
171 CDS_INIT_LIST_HEAD(&session
->priv
->enums_head
);
172 CDS_INIT_LIST_HEAD(&session
->priv
->enablers_head
);
173 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
174 CDS_INIT_HLIST_HEAD(&session
->priv
->events_ht
.table
[i
]);
175 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
176 CDS_INIT_HLIST_HEAD(&session
->priv
->enums_ht
.table
[i
]);
177 cds_list_add(&session
->priv
->node
, &sessions
);
181 struct lttng_counter
*lttng_ust_counter_create(
182 const char *counter_transport_name
,
183 size_t number_dimensions
, const struct lttng_counter_dimension
*dimensions
)
185 struct lttng_counter_transport
*counter_transport
= NULL
;
186 struct lttng_counter
*counter
= NULL
;
188 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
189 if (!counter_transport
)
191 counter
= zmalloc(sizeof(struct lttng_counter
));
195 counter
->ops
= &counter_transport
->ops
;
196 counter
->transport
= counter_transport
;
198 counter
->counter
= counter
->ops
->counter_create(
199 number_dimensions
, dimensions
, 0,
201 if (!counter
->counter
) {
215 void lttng_ust_counter_destroy(struct lttng_counter
*counter
)
217 counter
->ops
->counter_destroy(counter
->counter
);
221 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
223 struct lttng_event_notifier_group
*event_notifier_group
;
226 event_notifier_group
= zmalloc(sizeof(struct lttng_event_notifier_group
));
227 if (!event_notifier_group
)
230 /* Add all contexts. */
231 if (lttng_context_init_all(&event_notifier_group
->ctx
)) {
232 free(event_notifier_group
);
236 CDS_INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
237 CDS_INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
238 for (i
= 0; i
< LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
; i
++)
239 CDS_INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
241 cds_list_add(&event_notifier_group
->node
, &event_notifier_groups
);
243 return event_notifier_group
;
247 * Only used internally at session destruction.
250 void _lttng_channel_unmap(struct lttng_ust_channel_buffer
*lttng_chan
)
252 struct lttng_ust_lib_ring_buffer_channel
*chan
;
253 struct lttng_ust_shm_handle
*handle
;
255 cds_list_del(<tng_chan
->priv
->node
);
256 lttng_destroy_context(lttng_chan
->priv
->ctx
);
257 chan
= lttng_chan
->priv
->rb_chan
;
258 handle
= chan
->handle
;
259 channel_destroy(chan
, handle
, 0);
260 free(lttng_chan
->parent
);
261 free(lttng_chan
->priv
);
266 void register_event(struct lttng_ust_event_common
*event
)
269 const struct lttng_ust_event_desc
*desc
;
270 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
272 assert(event
->priv
->registered
== 0);
273 desc
= event
->priv
->desc
;
274 lttng_ust_format_event_name(desc
, name
);
275 ret
= lttng_ust_tp_probe_register_queue_release(name
,
276 desc
->probe_callback
,
277 event
, desc
->signature
);
280 event
->priv
->registered
= 1;
284 void unregister_event(struct lttng_ust_event_common
*event
)
287 const struct lttng_ust_event_desc
*desc
;
288 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
290 assert(event
->priv
->registered
== 1);
291 desc
= event
->priv
->desc
;
292 lttng_ust_format_event_name(desc
, name
);
293 ret
= lttng_ust_tp_probe_unregister_queue_release(name
,
294 desc
->probe_callback
,
298 event
->priv
->registered
= 0;
302 void _lttng_event_unregister(struct lttng_ust_event_common
*event
)
304 if (event
->priv
->registered
)
305 unregister_event(event
);
308 void lttng_session_destroy(struct lttng_ust_session
*session
)
310 struct lttng_ust_channel_buffer_private
*chan
, *tmpchan
;
311 struct lttng_ust_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
312 struct lttng_enum
*_enum
, *tmp_enum
;
313 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
315 CMM_ACCESS_ONCE(session
->active
) = 0;
316 cds_list_for_each_entry(event_recorder_priv
, &session
->priv
->events_head
, node
) {
317 _lttng_event_unregister(event_recorder_priv
->parent
.pub
);
319 lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */
320 lttng_ust_tp_probe_prune_release_queue();
321 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
322 &session
->priv
->enablers_head
, node
)
323 lttng_event_enabler_destroy(event_enabler
);
324 cds_list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
,
325 &session
->priv
->events_head
, node
)
326 _lttng_event_destroy(event_recorder_priv
->parent
.pub
);
327 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
328 &session
->priv
->enums_head
, node
)
329 _lttng_enum_destroy(_enum
);
330 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->priv
->chan_head
, node
)
331 _lttng_channel_unmap(chan
->pub
);
332 cds_list_del(&session
->priv
->node
);
333 lttng_destroy_context(session
->priv
->ctx
);
338 void lttng_event_notifier_group_destroy(
339 struct lttng_event_notifier_group
*event_notifier_group
)
342 struct lttng_event_notifier_enabler
*notifier_enabler
, *tmpnotifier_enabler
;
343 struct lttng_ust_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
345 if (!event_notifier_group
) {
349 cds_list_for_each_entry(event_notifier_priv
,
350 &event_notifier_group
->event_notifiers_head
, node
)
351 _lttng_event_unregister(event_notifier_priv
->parent
.pub
);
353 lttng_ust_urcu_synchronize_rcu();
355 cds_list_for_each_entry_safe(notifier_enabler
, tmpnotifier_enabler
,
356 &event_notifier_group
->enablers_head
, node
)
357 lttng_event_notifier_enabler_destroy(notifier_enabler
);
359 cds_list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
360 &event_notifier_group
->event_notifiers_head
, node
)
361 _lttng_event_destroy(event_notifier_priv
->parent
.pub
);
363 if (event_notifier_group
->error_counter
)
364 lttng_ust_counter_destroy(event_notifier_group
->error_counter
);
366 /* Close the notification fd to the listener of event_notifiers. */
368 lttng_ust_lock_fd_tracker();
369 close_ret
= close(event_notifier_group
->notification_fd
);
371 lttng_ust_delete_fd_from_tracker(
372 event_notifier_group
->notification_fd
);
377 lttng_ust_unlock_fd_tracker();
379 cds_list_del(&event_notifier_group
->node
);
380 lttng_destroy_context(event_notifier_group
->ctx
);
381 free(event_notifier_group
);
385 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
387 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
388 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
394 /* Destroy filter bytecode */
395 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
396 &enabler
->filter_bytecode_head
, node
) {
400 /* Destroy excluders */
401 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
402 &enabler
->excluder_head
, node
) {
407 void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
409 if (!event_notifier_enabler
) {
413 cds_list_del(&event_notifier_enabler
->node
);
415 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
417 free(event_notifier_enabler
);
421 int lttng_enum_create(const struct lttng_ust_enum_desc
*desc
,
422 struct lttng_ust_session
*session
)
424 const char *enum_name
= desc
->name
;
425 struct lttng_enum
*_enum
;
426 struct cds_hlist_head
*head
;
428 size_t name_len
= strlen(enum_name
);
432 /* Check if this enum is already registered for this session. */
433 hash
= jhash(enum_name
, name_len
, 0);
434 head
= &session
->priv
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
436 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
442 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
443 if (notify_socket
< 0) {
448 _enum
= zmalloc(sizeof(*_enum
));
453 _enum
->session
= session
;
456 ret
= ustcomm_register_enum(notify_socket
,
463 DBG("Error (%d) registering enumeration to sessiond", ret
);
464 goto sessiond_register_error
;
466 cds_list_add(&_enum
->node
, &session
->priv
->enums_head
);
467 cds_hlist_add_head(&_enum
->hlist
, head
);
470 sessiond_register_error
:
479 int lttng_create_enum_check(const struct lttng_ust_type_common
*type
,
480 struct lttng_ust_session
*session
)
482 switch (type
->type
) {
483 case lttng_ust_type_enum
:
485 const struct lttng_ust_enum_desc
*enum_desc
;
488 enum_desc
= lttng_ust_get_type_enum(type
)->desc
;
489 ret
= lttng_enum_create(enum_desc
, session
);
490 if (ret
&& ret
!= -EEXIST
) {
491 DBG("Unable to create enum error: (%d)", ret
);
496 case lttng_ust_type_dynamic
:
498 const struct lttng_ust_event_field
*tag_field_generic
;
499 const struct lttng_ust_enum_desc
*enum_desc
;
502 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
503 enum_desc
= lttng_ust_get_type_enum(tag_field_generic
->type
)->desc
;
504 ret
= lttng_enum_create(enum_desc
, session
);
505 if (ret
&& ret
!= -EEXIST
) {
506 DBG("Unable to create enum error: (%d)", ret
);
512 /* TODO: nested types when they become supported. */
519 int lttng_create_all_event_enums(size_t nr_fields
,
520 const struct lttng_ust_event_field
**event_fields
,
521 struct lttng_ust_session
*session
)
526 /* For each field, ensure enum is part of the session. */
527 for (i
= 0; i
< nr_fields
; i
++) {
528 const struct lttng_ust_type_common
*type
= event_fields
[i
]->type
;
530 ret
= lttng_create_enum_check(type
, session
);
538 int lttng_create_all_ctx_enums(size_t nr_fields
,
539 struct lttng_ust_ctx_field
*ctx_fields
,
540 struct lttng_ust_session
*session
)
545 /* For each field, ensure enum is part of the session. */
546 for (i
= 0; i
< nr_fields
; i
++) {
547 const struct lttng_ust_type_common
*type
= ctx_fields
[i
].event_field
->type
;
549 ret
= lttng_create_enum_check(type
, session
);
557 * Ensure that a state-dump will be performed for this session at the end
558 * of the current handle_message().
560 int lttng_session_statedump(struct lttng_ust_session
*session
)
562 session
->priv
->statedump_pending
= 1;
563 lttng_ust_sockinfo_session_enabled(session
->priv
->owner
);
567 int lttng_session_enable(struct lttng_ust_session
*session
)
570 struct lttng_ust_channel_buffer_private
*chan
;
573 if (session
->active
) {
578 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
579 if (notify_socket
< 0)
580 return notify_socket
;
582 /* Set transient enabler state to "enabled" */
583 session
->priv
->tstate
= 1;
585 /* We need to sync enablers with session before activation. */
586 lttng_session_sync_event_enablers(session
);
589 * Snapshot the number of events per channel to know the type of header
592 cds_list_for_each_entry(chan
, &session
->priv
->chan_head
, node
) {
593 struct lttng_ust_ctx
*ctx
;
594 struct lttng_ust_ctx_field
*fields
= NULL
;
595 size_t nr_fields
= 0;
598 /* don't change it if session stop/restart */
599 if (chan
->header_type
)
603 nr_fields
= ctx
->nr_fields
;
604 fields
= ctx
->fields
;
605 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
608 DBG("Error (%d) adding enum to session", ret
);
612 ret
= ustcomm_register_channel(notify_socket
,
621 DBG("Error (%d) registering channel to sessiond", ret
);
624 if (chan_id
!= chan
->id
) {
625 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
631 /* Set atomically the state to "active" */
632 CMM_ACCESS_ONCE(session
->active
) = 1;
633 CMM_ACCESS_ONCE(session
->priv
->been_active
) = 1;
635 ret
= lttng_session_statedump(session
);
642 int lttng_session_disable(struct lttng_ust_session
*session
)
646 if (!session
->active
) {
650 /* Set atomically the state to "inactive" */
651 CMM_ACCESS_ONCE(session
->active
) = 0;
653 /* Set transient enabler state to "disabled" */
654 session
->priv
->tstate
= 0;
655 lttng_session_sync_event_enablers(session
);
660 int lttng_channel_enable(struct lttng_ust_channel_common
*lttng_channel
)
664 if (lttng_channel
->enabled
) {
668 /* Set transient enabler state to "enabled" */
669 lttng_channel
->priv
->tstate
= 1;
670 lttng_session_sync_event_enablers(lttng_channel
->session
);
671 /* Set atomically the state to "enabled" */
672 CMM_ACCESS_ONCE(lttng_channel
->enabled
) = 1;
677 int lttng_channel_disable(struct lttng_ust_channel_common
*lttng_channel
)
681 if (!lttng_channel
->enabled
) {
685 /* Set atomically the state to "disabled" */
686 CMM_ACCESS_ONCE(lttng_channel
->enabled
) = 0;
687 /* Set transient enabler state to "enabled" */
688 lttng_channel
->priv
->tstate
= 0;
689 lttng_session_sync_event_enablers(lttng_channel
->session
);
695 struct cds_hlist_head
*borrow_hash_table_bucket(
696 struct cds_hlist_head
*hash_table
,
697 unsigned int hash_table_size
,
698 const struct lttng_ust_event_desc
*desc
)
700 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
704 lttng_ust_format_event_name(desc
, name
);
705 name_len
= strlen(name
);
707 hash
= jhash(name
, name_len
, 0);
708 return &hash_table
[hash
& (hash_table_size
- 1)];
712 * Supports event creation while tracing session is active.
715 int lttng_event_recorder_create(const struct lttng_ust_event_desc
*desc
,
716 struct lttng_ust_channel_buffer
*chan
)
718 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
719 struct lttng_ust_event_recorder
*event_recorder
;
720 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
721 struct lttng_ust_session
*session
= chan
->parent
->session
;
722 struct cds_hlist_head
*head
;
724 int notify_socket
, loglevel
;
727 head
= borrow_hash_table_bucket(chan
->parent
->session
->priv
->events_ht
.table
,
728 LTTNG_UST_EVENT_HT_SIZE
, desc
);
730 notify_socket
= lttng_get_notify_socket(session
->priv
->owner
);
731 if (notify_socket
< 0) {
736 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
739 DBG("Error (%d) adding enum to session", ret
);
740 goto create_enum_error
;
744 * Check if loglevel match. Refuse to connect event if not.
746 event_recorder
= zmalloc(sizeof(struct lttng_ust_event_recorder
));
747 if (!event_recorder
) {
751 event_recorder
->struct_size
= sizeof(struct lttng_ust_event_recorder
);
753 event_recorder
->parent
= zmalloc(sizeof(struct lttng_ust_event_common
));
754 if (!event_recorder
->parent
) {
758 event_recorder
->parent
->struct_size
= sizeof(struct lttng_ust_event_common
);
759 event_recorder
->parent
->type
= LTTNG_UST_EVENT_TYPE_RECORDER
;
760 event_recorder
->parent
->child
= event_recorder
;
762 event_recorder_priv
= zmalloc(sizeof(struct lttng_ust_event_recorder_private
));
763 if (!event_recorder_priv
) {
767 event_recorder
->priv
= event_recorder_priv
;
768 event_recorder_priv
->pub
= event_recorder
;
769 event_recorder
->parent
->priv
= &event_recorder_priv
->parent
;
770 event_recorder_priv
->parent
.pub
= event_recorder
->parent
;
772 event_recorder
->chan
= chan
;
774 /* Event will be enabled by enabler sync. */
775 event_recorder
->parent
->run_filter
= lttng_ust_interpret_event_filter
;
776 event_recorder
->parent
->enabled
= 0;
777 event_recorder
->parent
->priv
->registered
= 0;
778 CDS_INIT_LIST_HEAD(&event_recorder
->parent
->priv
->filter_bytecode_runtime_head
);
779 CDS_INIT_LIST_HEAD(&event_recorder
->parent
->priv
->enablers_ref_head
);
780 event_recorder
->parent
->priv
->desc
= desc
;
783 loglevel
= *(*event_recorder
->parent
->priv
->desc
->loglevel
);
785 loglevel
= TRACE_DEFAULT
;
786 if (desc
->model_emf_uri
)
787 uri
= *(desc
->model_emf_uri
);
791 lttng_ust_format_event_name(desc
, name
);
793 /* Fetch event ID from sessiond */
794 ret
= ustcomm_register_event(notify_socket
,
797 chan
->priv
->parent
.objd
,
804 &event_recorder
->priv
->id
);
806 DBG("Error (%d) registering event to sessiond", ret
);
807 goto sessiond_register_error
;
810 cds_list_add(&event_recorder_priv
->node
, &chan
->parent
->session
->priv
->events_head
);
811 cds_hlist_add_head(&event_recorder_priv
->hlist
, head
);
814 sessiond_register_error
:
815 free(event_recorder_priv
);
817 free(event_recorder
->parent
);
819 free(event_recorder
);
827 int lttng_event_notifier_create(const struct lttng_ust_event_desc
*desc
,
828 uint64_t token
, uint64_t error_counter_index
,
829 struct lttng_event_notifier_group
*event_notifier_group
)
831 struct lttng_ust_event_notifier
*event_notifier
;
832 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
833 struct cds_hlist_head
*head
;
837 * Get the hashtable bucket the created lttng_event_notifier object
838 * should be inserted.
840 head
= borrow_hash_table_bucket(
841 event_notifier_group
->event_notifiers_ht
.table
,
842 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
844 event_notifier
= zmalloc(sizeof(struct lttng_ust_event_notifier
));
845 if (!event_notifier
) {
849 event_notifier
->struct_size
= sizeof(struct lttng_ust_event_notifier
);
851 event_notifier
->parent
= zmalloc(sizeof(struct lttng_ust_event_common
));
852 if (!event_notifier
->parent
) {
856 event_notifier
->parent
->struct_size
= sizeof(struct lttng_ust_event_common
);
857 event_notifier
->parent
->type
= LTTNG_UST_EVENT_TYPE_NOTIFIER
;
858 event_notifier
->parent
->child
= event_notifier
;
860 event_notifier_priv
= zmalloc(sizeof(struct lttng_ust_event_notifier_private
));
861 if (!event_notifier_priv
) {
865 event_notifier
->priv
= event_notifier_priv
;
866 event_notifier_priv
->pub
= event_notifier
;
867 event_notifier
->parent
->priv
= &event_notifier_priv
->parent
;
868 event_notifier_priv
->parent
.pub
= event_notifier
->parent
;
870 event_notifier_priv
->group
= event_notifier_group
;
871 event_notifier_priv
->parent
.user_token
= token
;
872 event_notifier_priv
->error_counter_index
= error_counter_index
;
874 /* Event notifier will be enabled by enabler sync. */
875 event_notifier
->parent
->run_filter
= lttng_ust_interpret_event_filter
;
876 event_notifier
->parent
->enabled
= 0;
877 event_notifier_priv
->parent
.registered
= 0;
879 CDS_INIT_LIST_HEAD(&event_notifier
->parent
->priv
->filter_bytecode_runtime_head
);
880 CDS_INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
881 CDS_INIT_LIST_HEAD(&event_notifier_priv
->parent
.enablers_ref_head
);
882 event_notifier_priv
->parent
.desc
= desc
;
883 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
885 cds_list_add(&event_notifier_priv
->node
,
886 &event_notifier_group
->event_notifiers_head
);
887 cds_hlist_add_head(&event_notifier_priv
->hlist
, head
);
892 free(event_notifier
->parent
);
894 free(event_notifier
);
900 int lttng_desc_match_star_glob_enabler(const struct lttng_ust_event_desc
*desc
,
901 struct lttng_enabler
*enabler
)
903 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
905 unsigned int has_loglevel
= 0;
907 lttng_ust_format_event_name(desc
, name
);
908 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
909 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
912 if (desc
->loglevel
) {
913 loglevel
= *(*desc
->loglevel
);
916 if (!lttng_loglevel_match(loglevel
,
918 enabler
->event_param
.loglevel_type
,
919 enabler
->event_param
.loglevel
))
925 int lttng_desc_match_event_enabler(const struct lttng_ust_event_desc
*desc
,
926 struct lttng_enabler
*enabler
)
928 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
930 unsigned int has_loglevel
= 0;
932 lttng_ust_format_event_name(desc
, name
);
933 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
934 if (strcmp(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_ust_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_ABI_SYM_NAME_LEN
;
974 len
= strnlen(excluder_name
, LTTNG_UST_ABI_SYM_NAME_LEN
);
976 char name
[LTTNG_UST_ABI_SYM_NAME_LEN
];
978 lttng_ust_format_event_name(desc
, name
);
979 if (strutils_star_glob_match(excluder_name
, len
, name
, SIZE_MAX
)) {
987 case LTTNG_ENABLER_FORMAT_EVENT
:
988 return lttng_desc_match_event_enabler(desc
, enabler
);
995 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
996 struct lttng_ust_event_recorder
*event_recorder
)
998 if (lttng_desc_match_enabler(event_recorder
->parent
->priv
->desc
,
999 lttng_event_enabler_as_enabler(event_enabler
))
1000 && event_recorder
->chan
== event_enabler
->chan
)
1007 int lttng_event_notifier_enabler_match_event_notifier(
1008 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1009 struct lttng_ust_event_notifier
*event_notifier
)
1011 int desc_matches
= lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
,
1012 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1014 if (desc_matches
&& event_notifier
->priv
->group
== event_notifier_enabler
->group
&&
1015 event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->user_token
)
1022 struct lttng_enabler_ref
*lttng_enabler_ref(
1023 struct cds_list_head
*enabler_ref_list
,
1024 struct lttng_enabler
*enabler
)
1026 struct lttng_enabler_ref
*enabler_ref
;
1028 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
1029 if (enabler_ref
->ref
== enabler
)
1036 * Create struct lttng_event if it is missing and present in the list of
1037 * tracepoint probes.
1040 void lttng_create_event_recorder_if_missing(struct lttng_event_enabler
*event_enabler
)
1042 struct lttng_ust_session
*session
= event_enabler
->chan
->parent
->session
;
1043 struct lttng_ust_registered_probe
*reg_probe
;
1044 const struct lttng_ust_event_desc
*desc
;
1045 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1047 struct cds_list_head
*probe_list
;
1049 probe_list
= lttng_get_probe_list_head();
1051 * For each probe event, if we find that a probe event matches
1052 * our enabler, create an associated lttng_event if not
1055 cds_list_for_each_entry(reg_probe
, probe_list
, head
) {
1056 const struct lttng_ust_probe_desc
*probe_desc
= reg_probe
->desc
;
1058 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1061 struct cds_hlist_head
*head
;
1062 struct cds_hlist_node
*node
;
1064 desc
= probe_desc
->event_desc
[i
];
1065 if (!lttng_desc_match_enabler(desc
,
1066 lttng_event_enabler_as_enabler(event_enabler
)))
1069 head
= borrow_hash_table_bucket(
1070 session
->priv
->events_ht
.table
,
1071 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1073 cds_hlist_for_each_entry(event_recorder_priv
, node
, head
, hlist
) {
1074 if (event_recorder_priv
->parent
.desc
== desc
1075 && event_recorder_priv
->pub
->chan
== event_enabler
->chan
) {
1084 * We need to create an event for this
1087 ret
= lttng_event_recorder_create(probe_desc
->event_desc
[i
],
1088 event_enabler
->chan
);
1090 DBG("Unable to create event \"%s:%s\", error %d\n",
1091 probe_desc
->provider_name
,
1092 probe_desc
->event_desc
[i
]->event_name
, ret
);
1099 void probe_provider_event_for_each(const struct lttng_ust_probe_desc
*provider_desc
,
1100 void (*event_func
)(struct lttng_ust_event_common
*event
))
1102 struct cds_hlist_node
*node
, *tmp_node
;
1103 struct cds_list_head
*sessionsp
;
1106 /* Get handle on list of sessions. */
1107 sessionsp
= lttng_get_sessions();
1110 * Iterate over all events in the probe provider descriptions and
1111 * sessions to queue the unregistration of the events.
1113 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
1114 const struct lttng_ust_event_desc
*event_desc
;
1115 struct lttng_event_notifier_group
*event_notifier_group
;
1116 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1117 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1118 struct lttng_ust_session_private
*session_priv
;
1119 struct cds_hlist_head
*head
;
1121 event_desc
= provider_desc
->event_desc
[i
];
1124 * Iterate over all session to find the current event
1127 cds_list_for_each_entry(session_priv
, sessionsp
, node
) {
1129 * Get the list of events in the hashtable bucket and
1130 * iterate to find the event matching this descriptor.
1132 head
= borrow_hash_table_bucket(
1133 session_priv
->events_ht
.table
,
1134 LTTNG_UST_EVENT_HT_SIZE
, event_desc
);
1136 cds_hlist_for_each_entry_safe(event_recorder_priv
, node
, tmp_node
, head
, hlist
) {
1137 if (event_desc
== event_recorder_priv
->parent
.desc
) {
1138 event_func(event_recorder_priv
->parent
.pub
);
1145 * Iterate over all event_notifier groups to find the current event
1148 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1150 * Get the list of event_notifiers in the hashtable bucket and
1151 * iterate to find the event_notifier matching this
1154 head
= borrow_hash_table_bucket(
1155 event_notifier_group
->event_notifiers_ht
.table
,
1156 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, event_desc
);
1158 cds_hlist_for_each_entry_safe(event_notifier_priv
, node
, tmp_node
, head
, hlist
) {
1159 if (event_desc
== event_notifier_priv
->parent
.desc
) {
1160 event_func(event_notifier_priv
->parent
.pub
);
1169 void _event_enum_destroy(struct lttng_ust_event_common
*event
)
1172 switch (event
->type
) {
1173 case LTTNG_UST_EVENT_TYPE_RECORDER
:
1175 struct lttng_ust_event_recorder
*event_recorder
= event
->child
;
1176 struct lttng_ust_session
*session
= event_recorder
->chan
->parent
->session
;
1179 /* Destroy enums of the current event. */
1180 for (i
= 0; i
< event_recorder
->parent
->priv
->desc
->nr_fields
; i
++) {
1181 const struct lttng_ust_enum_desc
*enum_desc
;
1182 const struct lttng_ust_event_field
*field
;
1183 struct lttng_enum
*curr_enum
;
1185 field
= event_recorder
->parent
->priv
->desc
->fields
[i
];
1186 switch (field
->type
->type
) {
1187 case lttng_ust_type_enum
:
1188 enum_desc
= lttng_ust_get_type_enum(field
->type
)->desc
;
1194 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1196 _lttng_enum_destroy(curr_enum
);
1201 case LTTNG_UST_EVENT_TYPE_NOTIFIER
:
1206 /* Destroy event. */
1207 _lttng_event_destroy(event
);
1211 * Iterate over all the UST sessions to unregister and destroy all probes from
1212 * the probe provider descriptor received as argument. Must me called with the
1215 void lttng_probe_provider_unregister_events(
1216 const struct lttng_ust_probe_desc
*provider_desc
)
1219 * Iterate over all events in the probe provider descriptions and sessions
1220 * to queue the unregistration of the events.
1222 probe_provider_event_for_each(provider_desc
, _lttng_event_unregister
);
1224 /* Wait for grace period. */
1225 lttng_ust_urcu_synchronize_rcu();
1226 /* Prune the unregistration queue. */
1227 lttng_ust_tp_probe_prune_release_queue();
1230 * It is now safe to destroy the events and remove them from the event list
1233 probe_provider_event_for_each(provider_desc
, _event_enum_destroy
);
1237 * Create events associated with an event enabler (if not already present),
1238 * and add backward reference from the event to the enabler.
1241 int lttng_event_enabler_ref_event_recorders(struct lttng_event_enabler
*event_enabler
)
1243 struct lttng_ust_session
*session
= event_enabler
->chan
->parent
->session
;
1244 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1246 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1249 /* First ensure that probe events are created for this enabler. */
1250 lttng_create_event_recorder_if_missing(event_enabler
);
1252 /* For each event matching enabler in session event list. */
1253 cds_list_for_each_entry(event_recorder_priv
, &session
->priv
->events_head
, node
) {
1254 struct lttng_enabler_ref
*enabler_ref
;
1256 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder_priv
->pub
))
1259 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
1260 lttng_event_enabler_as_enabler(event_enabler
));
1263 * If no backward ref, create it.
1264 * Add backward ref from event to enabler.
1266 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1269 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1271 cds_list_add(&enabler_ref
->node
,
1272 &event_recorder_priv
->parent
.enablers_ref_head
);
1276 * Link filter bytecodes if not linked yet.
1278 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
1279 &session
->priv
->ctx
,
1280 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
1281 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1283 /* TODO: merge event context. */
1290 * Called at library load: connect the probe on all enablers matching
1292 * Called with session mutex held.
1294 int lttng_fix_pending_events(void)
1296 struct lttng_ust_session_private
*session_priv
;
1298 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1299 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
1304 int lttng_fix_pending_event_notifiers(void)
1306 struct lttng_event_notifier_group
*event_notifier_group
;
1308 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1309 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1315 * For each session of the owner thread, execute pending statedump.
1316 * Only dump state for the sessions owned by the caller thread, because
1317 * we don't keep ust_lock across the entire iteration.
1319 void lttng_handle_pending_statedump(void *owner
)
1321 struct lttng_ust_session_private
*session_priv
;
1323 /* Execute state dump */
1324 do_lttng_ust_statedump(owner
);
1326 /* Clear pending state dump */
1330 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
1331 if (session_priv
->owner
!= owner
)
1333 if (!session_priv
->statedump_pending
)
1335 session_priv
->statedump_pending
= 0;
1343 void _lttng_event_destroy(struct lttng_ust_event_common
*event
)
1345 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1347 lttng_free_event_filter_runtime(event
);
1348 /* Free event enabler refs */
1349 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1350 &event
->priv
->enablers_ref_head
, node
)
1353 switch (event
->type
) {
1354 case LTTNG_UST_EVENT_TYPE_RECORDER
:
1356 struct lttng_ust_event_recorder
*event_recorder
= event
->child
;
1358 /* Remove from event list. */
1359 cds_list_del(&event_recorder
->priv
->node
);
1360 /* Remove from event hash table. */
1361 cds_hlist_del(&event_recorder
->priv
->hlist
);
1363 lttng_destroy_context(event_recorder
->priv
->ctx
);
1364 free(event_recorder
->parent
);
1365 free(event_recorder
->priv
);
1366 free(event_recorder
);
1369 case LTTNG_UST_EVENT_TYPE_NOTIFIER
:
1371 struct lttng_ust_event_notifier
*event_notifier
= event
->child
;
1373 /* Remove from event list. */
1374 cds_list_del(&event_notifier
->priv
->node
);
1375 /* Remove from event hash table. */
1376 cds_hlist_del(&event_notifier
->priv
->hlist
);
1378 free(event_notifier
->priv
);
1379 free(event_notifier
->parent
);
1380 free(event_notifier
);
1389 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1391 cds_list_del(&_enum
->node
);
1392 cds_hlist_del(&_enum
->hlist
);
1396 void lttng_ust_abi_events_exit(void)
1398 struct lttng_ust_session_private
*session_priv
, *tmpsession_priv
;
1400 cds_list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, node
)
1401 lttng_session_destroy(session_priv
->pub
);
1405 * Enabler management.
1407 struct lttng_event_enabler
*lttng_event_enabler_create(
1408 enum lttng_enabler_format_type format_type
,
1409 struct lttng_ust_abi_event
*event_param
,
1410 struct lttng_ust_channel_buffer
*chan
)
1412 struct lttng_event_enabler
*event_enabler
;
1414 event_enabler
= zmalloc(sizeof(*event_enabler
));
1417 event_enabler
->base
.format_type
= format_type
;
1418 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1419 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1420 memcpy(&event_enabler
->base
.event_param
, event_param
,
1421 sizeof(event_enabler
->base
.event_param
));
1422 event_enabler
->chan
= chan
;
1424 event_enabler
->base
.enabled
= 0;
1425 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->parent
->session
->priv
->enablers_head
);
1426 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1428 return event_enabler
;
1431 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1432 struct lttng_event_notifier_group
*event_notifier_group
,
1433 enum lttng_enabler_format_type format_type
,
1434 struct lttng_ust_abi_event_notifier
*event_notifier_param
)
1436 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1438 event_notifier_enabler
= zmalloc(sizeof(*event_notifier_enabler
));
1439 if (!event_notifier_enabler
)
1441 event_notifier_enabler
->base
.format_type
= format_type
;
1442 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1443 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
1444 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.excluder_head
);
1446 event_notifier_enabler
->user_token
= event_notifier_param
->event
.token
;
1447 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
1448 event_notifier_enabler
->num_captures
= 0;
1450 memcpy(&event_notifier_enabler
->base
.event_param
.name
,
1451 event_notifier_param
->event
.name
,
1452 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1453 event_notifier_enabler
->base
.event_param
.instrumentation
=
1454 event_notifier_param
->event
.instrumentation
;
1455 event_notifier_enabler
->base
.event_param
.loglevel
=
1456 event_notifier_param
->event
.loglevel
;
1457 event_notifier_enabler
->base
.event_param
.loglevel_type
=
1458 event_notifier_param
->event
.loglevel_type
;
1460 event_notifier_enabler
->base
.enabled
= 0;
1461 event_notifier_enabler
->group
= event_notifier_group
;
1463 cds_list_add(&event_notifier_enabler
->node
,
1464 &event_notifier_group
->enablers_head
);
1466 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1468 return event_notifier_enabler
;
1471 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1473 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1474 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1479 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1481 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1482 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1488 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1489 struct lttng_ust_bytecode_node
**bytecode
)
1491 (*bytecode
)->enabler
= enabler
;
1492 cds_list_add_tail(&(*bytecode
)->node
, &enabler
->filter_bytecode_head
);
1493 /* Take ownership of bytecode */
1497 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1498 struct lttng_ust_bytecode_node
**bytecode
)
1500 _lttng_enabler_attach_filter_bytecode(
1501 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1503 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1508 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1509 struct lttng_ust_excluder_node
**excluder
)
1511 (*excluder
)->enabler
= enabler
;
1512 cds_list_add_tail(&(*excluder
)->node
, &enabler
->excluder_head
);
1513 /* Take ownership of excluder */
1517 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1518 struct lttng_ust_excluder_node
**excluder
)
1520 _lttng_enabler_attach_exclusion(
1521 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1523 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->parent
->session
);
1527 int lttng_event_notifier_enabler_enable(
1528 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1530 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
1531 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1536 int lttng_event_notifier_enabler_disable(
1537 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1539 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
1540 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1545 int lttng_event_notifier_enabler_attach_filter_bytecode(
1546 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1547 struct lttng_ust_bytecode_node
**bytecode
)
1549 _lttng_enabler_attach_filter_bytecode(
1550 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1553 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1557 int lttng_event_notifier_enabler_attach_capture_bytecode(
1558 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1559 struct lttng_ust_bytecode_node
**bytecode
)
1561 (*bytecode
)->enabler
= lttng_event_notifier_enabler_as_enabler(
1562 event_notifier_enabler
);
1563 cds_list_add_tail(&(*bytecode
)->node
,
1564 &event_notifier_enabler
->capture_bytecode_head
);
1565 /* Take ownership of bytecode */
1567 event_notifier_enabler
->num_captures
++;
1569 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1573 int lttng_event_notifier_enabler_attach_exclusion(
1574 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1575 struct lttng_ust_excluder_node
**excluder
)
1577 _lttng_enabler_attach_exclusion(
1578 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1581 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1585 int lttng_attach_context(struct lttng_ust_abi_context
*context_param
,
1586 union lttng_ust_abi_args
*uargs
,
1587 struct lttng_ust_ctx
**ctx
, struct lttng_ust_session
*session
)
1590 * We cannot attach a context after trace has been started for a
1591 * session because the metadata does not allow expressing this
1592 * information outside of the original channel scope.
1594 if (session
->priv
->been_active
)
1597 switch (context_param
->ctx
) {
1598 case LTTNG_UST_ABI_CONTEXT_PTHREAD_ID
:
1599 return lttng_add_pthread_id_to_ctx(ctx
);
1600 case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER
:
1602 struct lttng_ust_abi_perf_counter_ctx
*perf_ctx_param
;
1604 perf_ctx_param
= &context_param
->u
.perf_counter
;
1605 return lttng_add_perf_counter_to_ctx(
1606 perf_ctx_param
->type
,
1607 perf_ctx_param
->config
,
1608 perf_ctx_param
->name
,
1611 case LTTNG_UST_ABI_CONTEXT_VTID
:
1612 return lttng_add_vtid_to_ctx(ctx
);
1613 case LTTNG_UST_ABI_CONTEXT_VPID
:
1614 return lttng_add_vpid_to_ctx(ctx
);
1615 case LTTNG_UST_ABI_CONTEXT_PROCNAME
:
1616 return lttng_add_procname_to_ctx(ctx
);
1617 case LTTNG_UST_ABI_CONTEXT_IP
:
1618 return lttng_add_ip_to_ctx(ctx
);
1619 case LTTNG_UST_ABI_CONTEXT_CPU_ID
:
1620 return lttng_add_cpu_id_to_ctx(ctx
);
1621 case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT
:
1622 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1624 case LTTNG_UST_ABI_CONTEXT_CGROUP_NS
:
1625 return lttng_add_cgroup_ns_to_ctx(ctx
);
1626 case LTTNG_UST_ABI_CONTEXT_IPC_NS
:
1627 return lttng_add_ipc_ns_to_ctx(ctx
);
1628 case LTTNG_UST_ABI_CONTEXT_MNT_NS
:
1629 return lttng_add_mnt_ns_to_ctx(ctx
);
1630 case LTTNG_UST_ABI_CONTEXT_NET_NS
:
1631 return lttng_add_net_ns_to_ctx(ctx
);
1632 case LTTNG_UST_ABI_CONTEXT_PID_NS
:
1633 return lttng_add_pid_ns_to_ctx(ctx
);
1634 case LTTNG_UST_ABI_CONTEXT_TIME_NS
:
1635 return lttng_add_time_ns_to_ctx(ctx
);
1636 case LTTNG_UST_ABI_CONTEXT_USER_NS
:
1637 return lttng_add_user_ns_to_ctx(ctx
);
1638 case LTTNG_UST_ABI_CONTEXT_UTS_NS
:
1639 return lttng_add_uts_ns_to_ctx(ctx
);
1640 case LTTNG_UST_ABI_CONTEXT_VUID
:
1641 return lttng_add_vuid_to_ctx(ctx
);
1642 case LTTNG_UST_ABI_CONTEXT_VEUID
:
1643 return lttng_add_veuid_to_ctx(ctx
);
1644 case LTTNG_UST_ABI_CONTEXT_VSUID
:
1645 return lttng_add_vsuid_to_ctx(ctx
);
1646 case LTTNG_UST_ABI_CONTEXT_VGID
:
1647 return lttng_add_vgid_to_ctx(ctx
);
1648 case LTTNG_UST_ABI_CONTEXT_VEGID
:
1649 return lttng_add_vegid_to_ctx(ctx
);
1650 case LTTNG_UST_ABI_CONTEXT_VSGID
:
1651 return lttng_add_vsgid_to_ctx(ctx
);
1657 int lttng_event_enabler_attach_context(
1658 struct lttng_event_enabler
*enabler
__attribute__((unused
)),
1659 struct lttng_ust_abi_context
*context_param
__attribute__((unused
)))
1664 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1666 if (!event_enabler
) {
1669 cds_list_del(&event_enabler
->node
);
1671 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1673 lttng_destroy_context(event_enabler
->ctx
);
1674 free(event_enabler
);
1678 * lttng_session_sync_event_enablers should be called just before starting a
1682 void lttng_session_sync_event_enablers(struct lttng_ust_session
*session
)
1684 struct lttng_event_enabler
*event_enabler
;
1685 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
1687 cds_list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
1688 lttng_event_enabler_ref_event_recorders(event_enabler
);
1690 * For each event, if at least one of its enablers is enabled,
1691 * and its channel and session transient states are enabled, we
1692 * enable the event, else we disable it.
1694 cds_list_for_each_entry(event_recorder_priv
, &session
->priv
->events_head
, node
) {
1695 struct lttng_enabler_ref
*enabler_ref
;
1696 struct lttng_ust_bytecode_runtime
*runtime
;
1697 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
1701 cds_list_for_each_entry(enabler_ref
,
1702 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
1703 if (enabler_ref
->ref
->enabled
) {
1709 * Enabled state is based on union of enablers, with
1710 * intesection of session and channel transient enable
1713 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder_priv
->pub
->chan
->priv
->parent
.tstate
;
1715 CMM_STORE_SHARED(event_recorder_priv
->pub
->parent
->enabled
, enabled
);
1717 * Sync tracepoint registration with event enabled
1721 if (!event_recorder_priv
->parent
.registered
)
1722 register_event(event_recorder_priv
->parent
.pub
);
1724 if (event_recorder_priv
->parent
.registered
)
1725 unregister_event(event_recorder_priv
->parent
.pub
);
1728 /* Check if has enablers without bytecode enabled */
1729 cds_list_for_each_entry(enabler_ref
,
1730 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
1731 if (enabler_ref
->ref
->enabled
1732 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1733 has_enablers_without_filter_bytecode
= 1;
1737 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
1738 has_enablers_without_filter_bytecode
;
1740 /* Enable filters */
1741 cds_list_for_each_entry(runtime
,
1742 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
1743 lttng_bytecode_sync_state(runtime
);
1746 CMM_STORE_SHARED(event_recorder_priv
->parent
.pub
->eval_filter
,
1747 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
1749 lttng_ust_tp_probe_prune_release_queue();
1752 /* Support for event notifier is introduced by probe provider major version 2. */
1754 bool lttng_ust_probe_supports_event_notifier(const struct lttng_ust_probe_desc
*probe_desc
)
1756 return probe_desc
->major
>= 2;
1760 void lttng_create_event_notifier_if_missing(
1761 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1763 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1764 struct lttng_ust_registered_probe
*reg_probe
;
1765 struct cds_list_head
*probe_list
;
1768 probe_list
= lttng_get_probe_list_head();
1770 cds_list_for_each_entry(reg_probe
, probe_list
, head
) {
1771 const struct lttng_ust_probe_desc
*probe_desc
= reg_probe
->desc
;
1773 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1776 const struct lttng_ust_event_desc
*desc
;
1777 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1778 struct cds_hlist_head
*head
;
1779 struct cds_hlist_node
*node
;
1781 desc
= probe_desc
->event_desc
[i
];
1783 if (!lttng_desc_match_enabler(desc
,
1784 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1788 * Given the current event_notifier group, get the bucket that
1789 * the target event_notifier would be if it was already
1792 head
= borrow_hash_table_bucket(
1793 event_notifier_group
->event_notifiers_ht
.table
,
1794 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
1796 cds_hlist_for_each_entry(event_notifier_priv
, node
, head
, hlist
) {
1798 * Check if event_notifier already exists by checking
1799 * if the event_notifier and enabler share the same
1800 * description and id.
1802 if (event_notifier_priv
->parent
.desc
== desc
&&
1803 event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->user_token
) {
1812 /* Check that the probe supports event notifiers, else report the error. */
1813 if (!lttng_ust_probe_supports_event_notifier(probe_desc
)) {
1814 ERR("Probe \"%s\" contains event \"%s:%s\" which matches an enabled event notifier, "
1815 "but its version (%u.%u) is too old and does not implement event notifiers. "
1816 "It needs to be recompiled against a newer version of LTTng-UST, otherwise "
1817 "this event will not generate any notification.",
1818 probe_desc
->provider_name
,
1819 probe_desc
->provider_name
, desc
->event_name
,
1825 * We need to create a event_notifier for this event probe.
1827 ret
= lttng_event_notifier_create(desc
,
1828 event_notifier_enabler
->user_token
,
1829 event_notifier_enabler
->error_counter_index
,
1830 event_notifier_group
);
1832 DBG("Unable to create event_notifier \"%s:%s\", error %d\n",
1833 probe_desc
->provider_name
,
1834 probe_desc
->event_desc
[i
]->event_name
, ret
);
1841 * Create event_notifiers associated with a event_notifier enabler (if not already present).
1844 int lttng_event_notifier_enabler_ref_event_notifiers(
1845 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1847 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1848 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1851 * Only try to create event_notifiers for enablers that are enabled, the user
1852 * might still be attaching filter or exclusion to the
1853 * event_notifier_enabler.
1855 if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
)
1858 /* First, ensure that probe event_notifiers are created for this enabler. */
1859 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
1861 /* Link the created event_notifier with its associated enabler. */
1862 cds_list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
1863 struct lttng_enabler_ref
*enabler_ref
;
1865 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier_priv
->pub
))
1868 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
1869 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1872 * If no backward ref, create it.
1873 * Add backward ref from event_notifier to enabler.
1875 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1879 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
1880 event_notifier_enabler
);
1881 cds_list_add(&enabler_ref
->node
,
1882 &event_notifier_priv
->parent
.enablers_ref_head
);
1886 * Link filter bytecodes if not linked yet.
1888 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
1889 &event_notifier_group
->ctx
,
1890 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
1891 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
1894 * Link capture bytecodes if not linked yet.
1896 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
1897 &event_notifier_group
->ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
1898 &event_notifier_enabler
->capture_bytecode_head
);
1900 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
1907 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
1909 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1910 struct lttng_ust_event_notifier_private
*event_notifier_priv
;
1912 cds_list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
1913 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
1916 * For each event_notifier, if at least one of its enablers is enabled,
1917 * we enable the event_notifier, else we disable it.
1919 cds_list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
1920 struct lttng_enabler_ref
*enabler_ref
;
1921 struct lttng_ust_bytecode_runtime
*runtime
;
1922 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
1923 int nr_filters
= 0, nr_captures
= 0;
1925 /* Enable event_notifiers */
1926 cds_list_for_each_entry(enabler_ref
,
1927 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
1928 if (enabler_ref
->ref
->enabled
) {
1934 CMM_STORE_SHARED(event_notifier_priv
->pub
->parent
->enabled
, enabled
);
1936 * Sync tracepoint registration with event_notifier enabled
1940 if (!event_notifier_priv
->parent
.registered
)
1941 register_event(event_notifier_priv
->parent
.pub
);
1943 if (event_notifier_priv
->parent
.registered
)
1944 unregister_event(event_notifier_priv
->parent
.pub
);
1947 /* Check if has enablers without bytecode enabled */
1948 cds_list_for_each_entry(enabler_ref
,
1949 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
1950 if (enabler_ref
->ref
->enabled
1951 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1952 has_enablers_without_filter_bytecode
= 1;
1956 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
1957 has_enablers_without_filter_bytecode
;
1959 /* Enable filters */
1960 cds_list_for_each_entry(runtime
,
1961 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
1962 lttng_bytecode_sync_state(runtime
);
1965 CMM_STORE_SHARED(event_notifier_priv
->parent
.pub
->eval_filter
,
1966 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
1968 /* Enable captures. */
1969 cds_list_for_each_entry(runtime
,
1970 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
1971 lttng_bytecode_sync_state(runtime
);
1974 CMM_STORE_SHARED(event_notifier_priv
->pub
->eval_capture
,
1977 lttng_ust_tp_probe_prune_release_queue();
1981 * Apply enablers to session events, adding events to session if need
1982 * be. It is required after each modification applied to an active
1983 * session, and right before session "start".
1984 * "lazy" sync means we only sync if required.
1987 void lttng_session_lazy_sync_event_enablers(struct lttng_ust_session
*session
)
1989 /* We can skip if session is not active */
1990 if (!session
->active
)
1992 lttng_session_sync_event_enablers(session
);
1996 * Update all sessions with the given app context.
1997 * Called with ust lock held.
1998 * This is invoked when an application context gets loaded/unloaded. It
1999 * ensures the context callbacks are in sync with the application
2000 * context (either app context callbacks, or dummy callbacks).
2002 void lttng_ust_context_set_session_provider(const char *name
,
2003 size_t (*get_size
)(void *priv
, size_t offset
),
2004 void (*record
)(void *priv
, struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
2005 struct lttng_ust_channel_buffer
*chan
),
2006 void (*get_value
)(void *priv
, struct lttng_ust_ctx_value
*value
),
2009 struct lttng_ust_session_private
*session_priv
;
2011 cds_list_for_each_entry(session_priv
, &sessions
, node
) {
2012 struct lttng_ust_channel_buffer_private
*chan
;
2013 struct lttng_ust_event_recorder_private
*event_recorder_priv
;
2016 ret
= lttng_ust_context_set_provider_rcu(&session_priv
->ctx
,
2017 name
, get_size
, record
, get_value
, priv
);
2020 cds_list_for_each_entry(chan
, &session_priv
->chan_head
, node
) {
2021 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
2022 name
, get_size
, record
, get_value
, priv
);
2026 cds_list_for_each_entry(event_recorder_priv
, &session_priv
->events_head
, node
) {
2027 ret
= lttng_ust_context_set_provider_rcu(&event_recorder_priv
->ctx
,
2028 name
, get_size
, record
, get_value
, priv
);
2036 * Update all event_notifier groups with the given app context.
2037 * Called with ust lock held.
2038 * This is invoked when an application context gets loaded/unloaded. It
2039 * ensures the context callbacks are in sync with the application
2040 * context (either app context callbacks, or dummy callbacks).
2042 void lttng_ust_context_set_event_notifier_group_provider(const char *name
,
2043 size_t (*get_size
)(void *priv
, size_t offset
),
2044 void (*record
)(void *priv
, struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
2045 struct lttng_ust_channel_buffer
*chan
),
2046 void (*get_value
)(void *priv
, struct lttng_ust_ctx_value
*value
),
2049 struct lttng_event_notifier_group
*event_notifier_group
;
2051 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2054 ret
= lttng_ust_context_set_provider_rcu(
2055 &event_notifier_group
->ctx
,
2056 name
, get_size
, record
, get_value
, priv
);
2062 int lttng_ust_session_uuid_validate(struct lttng_ust_session
*session
,
2063 unsigned char *uuid
)
2067 /* Compare UUID with session. */
2068 if (session
->priv
->uuid_set
) {
2069 if (memcmp(session
->priv
->uuid
, uuid
, LTTNG_UST_UUID_LEN
)) {
2073 memcpy(session
->priv
->uuid
, uuid
, LTTNG_UST_UUID_LEN
);
2074 session
->priv
->uuid_set
= true;