1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.h>
40 #include <lttng/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.h>
50 #include <wrapper/time.h>
52 #define METADATA_CACHE_DEFAULT_SIZE 4096
54 static LIST_HEAD(sessions
);
55 static LIST_HEAD(event_notifier_groups
);
56 static LIST_HEAD(lttng_transport_list
);
57 static LIST_HEAD(lttng_counter_transport_list
);
59 * Protect the sessions and metadata caches.
61 static DEFINE_MUTEX(sessions_mutex
);
62 static struct kmem_cache
*event_recorder_cache
;
63 static struct kmem_cache
*event_recorder_private_cache
;
64 static struct kmem_cache
*event_notifier_cache
;
65 static struct kmem_cache
*event_notifier_private_cache
;
67 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
68 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
69 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
70 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
76 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
77 struct lttng_kernel_channel_buffer
*chan
,
78 struct lttng_kernel_event_recorder
*event
);
80 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
82 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
84 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
85 const struct lttng_kernel_type_common
*type
,
86 enum lttng_kernel_string_encoding parent_encoding
,
89 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
90 const struct lttng_kernel_event_field
*field
,
91 size_t nesting
, const char **prev_field_name_p
);
93 void synchronize_trace(void)
95 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
96 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
102 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
103 #ifdef CONFIG_PREEMPT_RT_FULL
106 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
107 #ifdef CONFIG_PREEMPT_RT
110 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
113 void lttng_lock_sessions(void)
115 mutex_lock(&sessions_mutex
);
118 void lttng_unlock_sessions(void)
120 mutex_unlock(&sessions_mutex
);
123 static struct lttng_transport
*lttng_transport_find(const char *name
)
125 struct lttng_transport
*transport
;
127 list_for_each_entry(transport
, <tng_transport_list
, node
) {
128 if (!strcmp(transport
->name
, name
))
135 * Called with sessions lock held.
137 int lttng_session_active(void)
139 struct lttng_kernel_session_private
*iter
;
141 list_for_each_entry(iter
, &sessions
, list
) {
142 if (iter
->pub
->active
)
148 struct lttng_kernel_session
*lttng_session_create(void)
150 struct lttng_kernel_session
*session
;
151 struct lttng_kernel_session_private
*session_priv
;
152 struct lttng_metadata_cache
*metadata_cache
;
155 mutex_lock(&sessions_mutex
);
156 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
159 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
161 goto err_free_session
;
162 session
->priv
= session_priv
;
163 session_priv
->pub
= session
;
165 INIT_LIST_HEAD(&session_priv
->chan
);
166 INIT_LIST_HEAD(&session_priv
->events
);
167 lttng_guid_gen(&session_priv
->uuid
);
169 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
172 goto err_free_session_private
;
173 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
174 if (!metadata_cache
->data
)
176 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
177 kref_init(&metadata_cache
->refcount
);
178 mutex_init(&metadata_cache
->lock
);
179 session_priv
->metadata_cache
= metadata_cache
;
180 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
181 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
182 sizeof(metadata_cache
->uuid
));
183 INIT_LIST_HEAD(&session_priv
->enablers_head
);
184 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
185 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
186 list_add(&session_priv
->list
, &sessions
);
188 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
189 goto tracker_alloc_error
;
190 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
195 goto tracker_alloc_error
;
196 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
197 goto tracker_alloc_error
;
198 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
199 goto tracker_alloc_error
;
201 mutex_unlock(&sessions_mutex
);
206 lttng_id_tracker_fini(&session
->pid_tracker
);
207 lttng_id_tracker_fini(&session
->vpid_tracker
);
208 lttng_id_tracker_fini(&session
->uid_tracker
);
209 lttng_id_tracker_fini(&session
->vuid_tracker
);
210 lttng_id_tracker_fini(&session
->gid_tracker
);
211 lttng_id_tracker_fini(&session
->vgid_tracker
);
213 kfree(metadata_cache
);
214 err_free_session_private
:
215 lttng_kvfree(session_priv
);
217 lttng_kvfree(session
);
219 mutex_unlock(&sessions_mutex
);
224 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
226 struct lttng_counter_transport
*transport
;
228 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
229 if (!strcmp(transport
->name
, name
))
235 struct lttng_counter
*lttng_kernel_counter_create(
236 const char *counter_transport_name
,
237 size_t number_dimensions
, const size_t *dimensions_sizes
)
239 struct lttng_counter
*counter
= NULL
;
240 struct lttng_counter_transport
*counter_transport
= NULL
;
242 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
243 if (!counter_transport
) {
244 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
245 counter_transport_name
);
248 if (!try_module_get(counter_transport
->owner
)) {
249 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
253 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
257 /* Create event notifier error counter. */
258 counter
->ops
= &counter_transport
->ops
;
259 counter
->transport
= counter_transport
;
261 counter
->counter
= counter
->ops
->counter_create(
262 number_dimensions
, dimensions_sizes
, 0);
263 if (!counter
->counter
) {
270 lttng_kvfree(counter
);
272 if (counter_transport
)
273 module_put(counter_transport
->owner
);
278 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
280 struct lttng_transport
*transport
= NULL
;
281 struct lttng_event_notifier_group
*event_notifier_group
;
282 const char *transport_name
= "relay-event-notifier";
283 size_t subbuf_size
= 4096; //TODO
284 size_t num_subbuf
= 16; //TODO
285 unsigned int switch_timer_interval
= 0;
286 unsigned int read_timer_interval
= 0;
289 mutex_lock(&sessions_mutex
);
291 transport
= lttng_transport_find(transport_name
);
293 printk(KERN_WARNING
"LTTng: transport %s not found\n",
297 if (!try_module_get(transport
->owner
)) {
298 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
303 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
305 if (!event_notifier_group
)
309 * Initialize the ring buffer used to store event notifier
312 event_notifier_group
->ops
= &transport
->ops
;
313 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
314 transport_name
, event_notifier_group
, NULL
,
315 subbuf_size
, num_subbuf
, switch_timer_interval
,
316 read_timer_interval
);
317 if (!event_notifier_group
->chan
)
320 event_notifier_group
->transport
= transport
;
322 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
323 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
324 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
325 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
327 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
329 mutex_unlock(&sessions_mutex
);
331 return event_notifier_group
;
334 lttng_kvfree(event_notifier_group
);
337 module_put(transport
->owner
);
339 mutex_unlock(&sessions_mutex
);
343 void metadata_cache_destroy(struct kref
*kref
)
345 struct lttng_metadata_cache
*cache
=
346 container_of(kref
, struct lttng_metadata_cache
, refcount
);
351 void lttng_session_destroy(struct lttng_kernel_session
*session
)
353 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
354 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
355 struct lttng_metadata_stream
*metadata_stream
;
356 struct lttng_event_recorder_enabler
*event_recorder_enabler
, *tmp_event_recorder_enabler
;
359 mutex_lock(&sessions_mutex
);
360 WRITE_ONCE(session
->active
, 0);
361 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
362 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
365 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
366 ret
= _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
369 synchronize_trace(); /* Wait for in-flight events to complete */
370 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
371 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
374 list_for_each_entry_safe(event_recorder_enabler
, tmp_event_recorder_enabler
,
375 &session
->priv
->enablers_head
, node
)
376 lttng_event_enabler_destroy(&event_recorder_enabler
->parent
);
377 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, node
)
378 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
379 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
380 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
381 _lttng_channel_destroy(chan_priv
->pub
);
383 mutex_lock(&session
->priv
->metadata_cache
->lock
);
384 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
385 _lttng_metadata_channel_hangup(metadata_stream
);
386 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
387 lttng_id_tracker_fini(&session
->pid_tracker
);
388 lttng_id_tracker_fini(&session
->vpid_tracker
);
389 lttng_id_tracker_fini(&session
->uid_tracker
);
390 lttng_id_tracker_fini(&session
->vuid_tracker
);
391 lttng_id_tracker_fini(&session
->gid_tracker
);
392 lttng_id_tracker_fini(&session
->vgid_tracker
);
393 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
394 list_del(&session
->priv
->list
);
395 mutex_unlock(&sessions_mutex
);
396 lttng_kvfree(session
->priv
);
397 lttng_kvfree(session
);
400 void lttng_event_notifier_group_destroy(
401 struct lttng_event_notifier_group
*event_notifier_group
)
403 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
404 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
407 if (!event_notifier_group
)
410 mutex_lock(&sessions_mutex
);
412 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
415 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
416 &event_notifier_group
->event_notifiers_head
, node
) {
417 ret
= _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
421 /* Wait for in-flight event notifier to complete */
424 irq_work_sync(&event_notifier_group
->wakeup_pending
);
426 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
429 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
430 &event_notifier_group
->enablers_head
, node
)
431 lttng_event_enabler_destroy(&event_notifier_enabler
->parent
);
433 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
434 &event_notifier_group
->event_notifiers_head
, node
)
435 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
437 if (event_notifier_group
->error_counter
) {
438 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
440 error_counter
->ops
->counter_destroy(error_counter
->counter
);
441 module_put(error_counter
->transport
->owner
);
442 lttng_kvfree(error_counter
);
443 event_notifier_group
->error_counter
= NULL
;
446 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
447 module_put(event_notifier_group
->transport
->owner
);
448 list_del(&event_notifier_group
->node
);
450 mutex_unlock(&sessions_mutex
);
451 lttng_kvfree(event_notifier_group
);
454 int lttng_session_statedump(struct lttng_kernel_session
*session
)
458 mutex_lock(&sessions_mutex
);
459 ret
= lttng_statedump_start(session
);
460 mutex_unlock(&sessions_mutex
);
464 int lttng_session_enable(struct lttng_kernel_session
*session
)
467 struct lttng_kernel_channel_buffer_private
*chan_priv
;
469 mutex_lock(&sessions_mutex
);
470 if (session
->active
) {
475 /* Set transient enabler state to "enabled" */
476 session
->priv
->tstate
= 1;
478 /* We need to sync enablers with session before activation. */
479 lttng_session_sync_event_enablers(session
);
482 * Snapshot the number of events per channel to know the type of header
485 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
486 if (chan_priv
->header_type
)
487 continue; /* don't change it if session stop/restart */
488 if (chan_priv
->free_event_id
< 31)
489 chan_priv
->header_type
= 1; /* compact */
491 chan_priv
->header_type
= 2; /* large */
494 /* Clear each stream's quiescent state. */
495 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
496 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
497 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
500 WRITE_ONCE(session
->active
, 1);
501 WRITE_ONCE(session
->priv
->been_active
, 1);
502 ret
= _lttng_session_metadata_statedump(session
);
504 WRITE_ONCE(session
->active
, 0);
507 ret
= lttng_statedump_start(session
);
509 WRITE_ONCE(session
->active
, 0);
511 mutex_unlock(&sessions_mutex
);
515 int lttng_session_disable(struct lttng_kernel_session
*session
)
518 struct lttng_kernel_channel_buffer_private
*chan_priv
;
520 mutex_lock(&sessions_mutex
);
521 if (!session
->active
) {
525 WRITE_ONCE(session
->active
, 0);
527 /* Set transient enabler state to "disabled" */
528 session
->priv
->tstate
= 0;
529 lttng_session_sync_event_enablers(session
);
531 /* Set each stream's quiescent state. */
532 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
533 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
534 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
537 mutex_unlock(&sessions_mutex
);
541 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
544 struct lttng_kernel_channel_buffer_private
*chan_priv
;
545 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
546 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
547 struct lttng_metadata_stream
*stream
;
549 mutex_lock(&sessions_mutex
);
550 if (!session
->active
) {
555 mutex_lock(&cache
->lock
);
556 memset(cache
->data
, 0, cache
->cache_alloc
);
557 cache
->metadata_written
= 0;
559 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
560 stream
->metadata_out
= 0;
561 stream
->metadata_in
= 0;
563 mutex_unlock(&cache
->lock
);
565 session
->priv
->metadata_dumped
= 0;
566 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
567 chan_priv
->metadata_dumped
= 0;
570 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
571 event_recorder_priv
->metadata_dumped
= 0;
574 ret
= _lttng_session_metadata_statedump(session
);
577 mutex_unlock(&sessions_mutex
);
582 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
584 struct lttng_kernel_channel_buffer
*chan_buf
;
586 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
588 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
589 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
594 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
598 mutex_lock(&sessions_mutex
);
599 if (is_channel_buffer_metadata(channel
)) {
603 if (channel
->enabled
) {
607 /* Set transient enabler state to "enabled" */
608 channel
->priv
->tstate
= 1;
609 lttng_session_sync_event_enablers(channel
->session
);
610 /* Set atomically the state to "enabled" */
611 WRITE_ONCE(channel
->enabled
, 1);
613 mutex_unlock(&sessions_mutex
);
617 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
621 mutex_lock(&sessions_mutex
);
622 if (is_channel_buffer_metadata(channel
)) {
626 if (!channel
->enabled
) {
630 /* Set atomically the state to "disabled" */
631 WRITE_ONCE(channel
->enabled
, 0);
632 /* Set transient enabler state to "enabled" */
633 channel
->priv
->tstate
= 0;
634 lttng_session_sync_event_enablers(channel
->session
);
636 mutex_unlock(&sessions_mutex
);
640 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
644 mutex_lock(&sessions_mutex
);
645 switch (event
->type
) {
646 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
648 struct lttng_kernel_event_recorder
*event_recorder
=
649 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
651 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
657 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
658 switch (event
->priv
->instrumentation
) {
659 case LTTNG_KERNEL_ABI_KRETPROBE
:
670 if (event
->enabled
) {
674 switch (event
->priv
->instrumentation
) {
675 case LTTNG_KERNEL_ABI_TRACEPOINT
:
677 case LTTNG_KERNEL_ABI_SYSCALL
:
681 case LTTNG_KERNEL_ABI_KPROBE
:
683 case LTTNG_KERNEL_ABI_UPROBE
:
684 WRITE_ONCE(event
->enabled
, 1);
687 case LTTNG_KERNEL_ABI_KRETPROBE
:
688 ret
= lttng_kretprobes_event_enable_state(event
, 1);
691 case LTTNG_KERNEL_ABI_FUNCTION
:
693 case LTTNG_KERNEL_ABI_NOOP
:
700 mutex_unlock(&sessions_mutex
);
704 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
708 mutex_lock(&sessions_mutex
);
709 switch (event
->type
) {
710 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
712 struct lttng_kernel_event_recorder
*event_recorder
=
713 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
715 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
721 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
722 switch (event
->priv
->instrumentation
) {
723 case LTTNG_KERNEL_ABI_KRETPROBE
:
734 if (!event
->enabled
) {
738 switch (event
->priv
->instrumentation
) {
739 case LTTNG_KERNEL_ABI_TRACEPOINT
:
741 case LTTNG_KERNEL_ABI_SYSCALL
:
745 case LTTNG_KERNEL_ABI_KPROBE
:
747 case LTTNG_KERNEL_ABI_UPROBE
:
748 WRITE_ONCE(event
->enabled
, 0);
751 case LTTNG_KERNEL_ABI_KRETPROBE
:
752 ret
= lttng_kretprobes_event_enable_state(event
, 0);
755 case LTTNG_KERNEL_ABI_FUNCTION
:
757 case LTTNG_KERNEL_ABI_NOOP
:
764 mutex_unlock(&sessions_mutex
);
768 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
769 const char *transport_name
,
771 size_t subbuf_size
, size_t num_subbuf
,
772 unsigned int switch_timer_interval
,
773 unsigned int read_timer_interval
,
774 enum channel_type channel_type
)
776 struct lttng_kernel_channel_buffer
*chan
;
777 struct lttng_kernel_channel_buffer_private
*chan_priv
;
778 struct lttng_transport
*transport
= NULL
;
780 mutex_lock(&sessions_mutex
);
781 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
782 goto active
; /* Refuse to add channel to active session */
783 transport
= lttng_transport_find(transport_name
);
785 printk(KERN_WARNING
"LTTng: transport %s not found\n",
789 if (!try_module_get(transport
->owner
)) {
790 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
793 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
796 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
799 chan
->priv
= chan_priv
;
800 chan_priv
->pub
= chan
;
801 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
802 chan
->parent
.session
= session
;
803 chan
->priv
->id
= session
->priv
->free_chan_id
++;
804 chan
->ops
= &transport
->ops
;
806 * Note: the channel creation op already writes into the packet
807 * headers. Therefore the "chan" information used as input
808 * should be already accessible.
810 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
811 chan
, buf_addr
, subbuf_size
, num_subbuf
,
812 switch_timer_interval
, read_timer_interval
);
813 if (!chan
->priv
->rb_chan
)
815 chan
->priv
->parent
.tstate
= 1;
816 chan
->parent
.enabled
= 1;
817 chan
->priv
->transport
= transport
;
818 chan
->priv
->channel_type
= channel_type
;
819 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
820 mutex_unlock(&sessions_mutex
);
829 module_put(transport
->owner
);
832 mutex_unlock(&sessions_mutex
);
837 * Only used internally at session destruction for per-cpu channels, and
838 * when metadata channel is released.
839 * Needs to be called with sessions mutex held.
842 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
844 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
845 module_put(chan
->priv
->transport
->owner
);
846 list_del(&chan
->priv
->node
);
847 lttng_kernel_destroy_context(chan
->priv
->ctx
);
852 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
854 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
856 /* Protect the metadata cache with the sessions_mutex. */
857 mutex_lock(&sessions_mutex
);
858 _lttng_channel_destroy(chan
);
859 mutex_unlock(&sessions_mutex
);
861 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
864 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
866 stream
->finalized
= 1;
867 wake_up_interruptible(&stream
->read_wait
);
872 * Supports event creation while tracing session is active.
873 * Needs to be called with sessions mutex held.
875 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
876 const struct lttng_kernel_event_desc
*event_desc
)
878 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
879 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
880 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
881 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
882 struct lttng_kernel_event_recorder
*event_recorder
;
883 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
884 struct lttng_kernel_event_common_private
*event_priv
;
885 const char *event_name
;
886 struct hlist_head
*head
;
889 if (chan
->priv
->free_event_id
== -1U) {
895 case LTTNG_KERNEL_ABI_TRACEPOINT
:
896 event_name
= event_desc
->event_name
;
899 case LTTNG_KERNEL_ABI_KPROBE
:
901 case LTTNG_KERNEL_ABI_UPROBE
:
903 case LTTNG_KERNEL_ABI_KRETPROBE
:
905 case LTTNG_KERNEL_ABI_SYSCALL
:
906 event_name
= event_param
->name
;
909 case LTTNG_KERNEL_ABI_FUNCTION
:
911 case LTTNG_KERNEL_ABI_NOOP
:
919 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
920 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
921 event_recorder_priv
= container_of(event_priv
, struct lttng_kernel_event_recorder_private
, parent
);
923 WARN_ON_ONCE(!event_priv
->desc
);
924 if (!strncmp(event_priv
->desc
->event_name
, event_name
,
925 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
926 && chan
== event_recorder_priv
->pub
->chan
) {
932 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
933 if (!event_recorder
) {
937 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
938 if (!event_recorder_priv
) {
940 goto cache_private_error
;
942 event_recorder_priv
->pub
= event_recorder
;
943 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
944 event_recorder
->priv
= event_recorder_priv
;
945 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
946 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
948 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
949 event_recorder
->chan
= chan
;
950 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
951 event_recorder
->priv
->parent
.instrumentation
= itype
;
952 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
953 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
956 case LTTNG_KERNEL_ABI_TRACEPOINT
:
957 /* Event will be enabled by enabler sync. */
958 event_recorder
->parent
.enabled
= 0;
959 event_recorder
->priv
->parent
.registered
= 0;
960 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
961 if (!event_recorder
->priv
->parent
.desc
) {
965 /* Populate lttng_event structure before event registration. */
969 case LTTNG_KERNEL_ABI_KPROBE
:
971 * Needs to be explicitly enabled after creation, since
972 * we may want to apply filters.
974 event_recorder
->parent
.enabled
= 0;
975 event_recorder
->priv
->parent
.registered
= 1;
977 * Populate lttng_event structure before event
981 ret
= lttng_kprobes_register_event(event_name
,
982 event_param
->u
.kprobe
.symbol_name
,
983 event_param
->u
.kprobe
.offset
,
984 event_param
->u
.kprobe
.addr
,
985 &event_recorder
->parent
);
990 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
994 case LTTNG_KERNEL_ABI_KRETPROBE
:
996 struct lttng_kernel_event_recorder
*event_recorder_return
;
997 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
999 /* kretprobe defines 2 events */
1001 * Needs to be explicitly enabled after creation, since
1002 * we may want to apply filters.
1004 event_recorder
->parent
.enabled
= 0;
1005 event_recorder
->priv
->parent
.registered
= 1;
1007 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
1008 if (!event_recorder_return
) {
1010 goto register_error
;
1012 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
1013 if (!event_recorder_return_priv
) {
1014 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1016 goto register_error
;
1018 event_recorder_return_priv
->pub
= event_recorder_return
;
1019 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
1020 event_recorder_return
->priv
= event_recorder_return_priv
;
1021 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
1022 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
1024 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1025 event_recorder_return
->chan
= chan
;
1026 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
1027 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
1028 event_recorder_return
->parent
.enabled
= 0;
1029 event_recorder_return
->priv
->parent
.registered
= 1;
1030 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1031 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1033 * Populate lttng_event structure before kretprobe registration.
1036 ret
= lttng_kretprobes_register(event_name
,
1037 event_param
->u
.kretprobe
.symbol_name
,
1038 event_param
->u
.kretprobe
.offset
,
1039 event_param
->u
.kretprobe
.addr
,
1040 &event_recorder
->parent
, &event_recorder_return
->parent
);
1042 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1043 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1045 goto register_error
;
1047 /* Take 2 refs on the module: one per event. */
1048 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1050 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1052 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1053 event_recorder_return
);
1054 WARN_ON_ONCE(ret
> 0);
1056 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1057 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1058 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1059 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1060 goto statedump_error
;
1062 list_add(&event_recorder_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1066 case LTTNG_KERNEL_ABI_SYSCALL
:
1068 * Needs to be explicitly enabled after creation, since
1069 * we may want to apply filters.
1071 event_recorder
->parent
.enabled
= 0;
1072 event_recorder
->priv
->parent
.registered
= 0;
1073 event_recorder
->priv
->parent
.desc
= event_desc
;
1074 switch (event_param
->u
.syscall
.entryexit
) {
1075 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1077 goto register_error
;
1078 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1079 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1081 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1082 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1085 switch (event_param
->u
.syscall
.abi
) {
1086 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1088 goto register_error
;
1089 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1090 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1092 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1093 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1096 if (!event_recorder
->priv
->parent
.desc
) {
1098 goto register_error
;
1102 case LTTNG_KERNEL_ABI_UPROBE
:
1104 * Needs to be explicitly enabled after creation, since
1105 * we may want to apply filters.
1107 event_recorder
->parent
.enabled
= 0;
1108 event_recorder
->priv
->parent
.registered
= 1;
1111 * Populate lttng_event structure before event
1116 ret
= lttng_uprobes_register_event(event_param
->name
,
1117 event_param
->u
.uprobe
.fd
,
1118 &event_recorder
->parent
);
1120 goto register_error
;
1121 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1125 case LTTNG_KERNEL_ABI_FUNCTION
:
1127 case LTTNG_KERNEL_ABI_NOOP
:
1132 goto register_error
;
1134 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1135 WARN_ON_ONCE(ret
> 0);
1137 goto statedump_error
;
1139 hlist_add_head(&event_recorder
->priv
->parent
.hlist_node
, head
);
1140 list_add(&event_recorder
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1141 return event_recorder
;
1144 /* If a statedump error occurs, events will not be readable. */
1146 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1147 cache_private_error
:
1148 kmem_cache_free(event_recorder_cache
, event_recorder
);
1153 return ERR_PTR(ret
);
1156 struct lttng_kernel_event_notifier
*_lttng_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1157 const struct lttng_kernel_event_desc
*event_desc
)
1159 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1160 struct lttng_event_notifier_group
*event_notifier_group
= event_enabler
->group
;
1161 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1162 uint64_t token
= event_enabler
->parent
.user_token
;
1163 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1164 struct lttng_kernel_event_notifier
*event_notifier
;
1165 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1166 struct lttng_kernel_event_common_private
*event_priv
;
1167 struct lttng_counter
*error_counter
;
1168 const char *event_name
;
1169 struct hlist_head
*head
;
1173 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1174 event_name
= event_desc
->event_name
;
1177 case LTTNG_KERNEL_ABI_KPROBE
:
1179 case LTTNG_KERNEL_ABI_UPROBE
:
1181 case LTTNG_KERNEL_ABI_SYSCALL
:
1182 event_name
= event_param
->name
;
1185 case LTTNG_KERNEL_ABI_KRETPROBE
:
1187 case LTTNG_KERNEL_ABI_FUNCTION
:
1189 case LTTNG_KERNEL_ABI_NOOP
:
1197 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1198 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1199 event_notifier_priv
= container_of(event_priv
, struct lttng_kernel_event_notifier_private
, parent
);
1201 WARN_ON_ONCE(!event_priv
->desc
);
1202 if (!strncmp(event_priv
->desc
->event_name
, event_name
,
1203 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1204 && event_notifier_group
== event_notifier_priv
->group
1205 && token
== event_priv
->user_token
) {
1211 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1212 if (!event_notifier
) {
1216 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1217 if (!event_notifier_priv
) {
1219 goto cache_private_error
;
1221 event_notifier_priv
->pub
= event_notifier
;
1222 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1223 event_notifier
->priv
= event_notifier_priv
;
1224 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1225 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1227 event_notifier
->priv
->group
= event_notifier_group
;
1228 event_notifier
->priv
->parent
.user_token
= event_enabler
->parent
.user_token
;
1229 event_notifier
->priv
->error_counter_index
= event_enabler
->error_counter_index
;
1230 event_notifier
->priv
->num_captures
= 0;
1231 event_notifier
->priv
->parent
.instrumentation
= itype
;
1232 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1233 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1234 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1235 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1236 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1239 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1240 /* Event will be enabled by enabler sync. */
1241 event_notifier
->parent
.enabled
= 0;
1242 event_notifier
->priv
->parent
.registered
= 0;
1243 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1244 if (!event_notifier
->priv
->parent
.desc
) {
1246 goto register_error
;
1248 /* Populate lttng_event_notifier structure before event registration. */
1252 case LTTNG_KERNEL_ABI_KPROBE
:
1254 * Needs to be explicitly enabled after creation, since
1255 * we may want to apply filters.
1257 event_notifier
->parent
.enabled
= 0;
1258 event_notifier
->priv
->parent
.registered
= 1;
1260 * Populate lttng_event_notifier structure before event
1264 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1265 event_param
->u
.kprobe
.symbol_name
,
1266 event_param
->u
.kprobe
.offset
,
1267 event_param
->u
.kprobe
.addr
,
1268 &event_notifier
->parent
);
1271 goto register_error
;
1273 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1277 case LTTNG_KERNEL_ABI_SYSCALL
:
1279 * Needs to be explicitly enabled after creation, since
1280 * we may want to apply filters.
1282 event_notifier
->parent
.enabled
= 0;
1283 event_notifier
->priv
->parent
.registered
= 0;
1284 event_notifier
->priv
->parent
.desc
= event_desc
;
1285 switch (event_param
->u
.syscall
.entryexit
) {
1286 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1288 goto register_error
;
1289 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1290 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1292 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1293 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1296 switch (event_param
->u
.syscall
.abi
) {
1297 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1299 goto register_error
;
1300 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1301 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1303 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1304 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1308 if (!event_notifier
->priv
->parent
.desc
) {
1310 goto register_error
;
1314 case LTTNG_KERNEL_ABI_UPROBE
:
1316 * Needs to be explicitly enabled after creation, since
1317 * we may want to apply filters.
1319 event_notifier
->parent
.enabled
= 0;
1320 event_notifier
->priv
->parent
.registered
= 1;
1323 * Populate lttng_event_notifier structure before
1324 * event_notifier registration.
1328 ret
= lttng_uprobes_register_event(event_param
->name
,
1329 event_param
->u
.uprobe
.fd
,
1330 &event_notifier
->parent
);
1332 goto register_error
;
1333 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1337 case LTTNG_KERNEL_ABI_KRETPROBE
:
1339 case LTTNG_KERNEL_ABI_FUNCTION
:
1341 case LTTNG_KERNEL_ABI_NOOP
:
1346 goto register_error
;
1349 list_add(&event_notifier
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1350 hlist_add_head(&event_notifier
->priv
->parent
.hlist_node
, head
);
1353 * Clear the error counter bucket. The sessiond keeps track of which
1354 * bucket is currently in use. We trust it. The session lock
1355 * synchronizes against concurrent creation of the error
1358 error_counter
= event_notifier_group
->error_counter
;
1359 if (error_counter
) {
1360 size_t dimension_index
[1];
1363 * Check that the index is within the boundary of the counter.
1365 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1366 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1367 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1369 goto register_error
;
1372 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1373 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1375 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1376 event_notifier
->priv
->error_counter_index
);
1377 goto register_error
;
1381 return event_notifier
;
1384 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1385 cache_private_error
:
1386 kmem_cache_free(event_notifier_cache
, event_notifier
);
1390 return ERR_PTR(ret
);
1393 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1394 const size_t *dim_indexes
, int32_t cpu
,
1395 int64_t *val
, bool *overflow
, bool *underflow
)
1397 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1398 cpu
, val
, overflow
, underflow
);
1401 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1402 const size_t *dim_indexes
, int64_t *val
,
1403 bool *overflow
, bool *underflow
)
1405 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1406 val
, overflow
, underflow
);
1409 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1410 const size_t *dim_indexes
)
1412 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1415 struct lttng_kernel_event_recorder
*lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
1416 const struct lttng_kernel_event_desc
*event_desc
)
1418 struct lttng_kernel_event_recorder
*event
;
1420 mutex_lock(&sessions_mutex
);
1421 event
= _lttng_kernel_event_recorder_create(event_enabler
, event_desc
);
1422 mutex_unlock(&sessions_mutex
);
1426 struct lttng_kernel_event_notifier
*lttng_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1427 const struct lttng_kernel_event_desc
*event_desc
)
1429 struct lttng_kernel_event_notifier
*event_notifier
;
1431 mutex_lock(&sessions_mutex
);
1432 event_notifier
= _lttng_event_notifier_create(event_enabler
, event_desc
);
1433 mutex_unlock(&sessions_mutex
);
1434 return event_notifier
;
1437 /* Only used for tracepoints for now. */
1439 void register_event(struct lttng_kernel_event_common
*event
)
1441 const struct lttng_kernel_event_desc
*desc
;
1444 if (event
->priv
->registered
)
1447 desc
= event
->priv
->desc
;
1448 switch (event
->priv
->instrumentation
) {
1449 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1450 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1451 desc
->tp_class
->probe_callback
,
1455 case LTTNG_KERNEL_ABI_SYSCALL
:
1456 ret
= lttng_syscall_filter_enable_event(event
);
1459 case LTTNG_KERNEL_ABI_KPROBE
:
1461 case LTTNG_KERNEL_ABI_UPROBE
:
1465 case LTTNG_KERNEL_ABI_KRETPROBE
:
1466 switch (event
->type
) {
1467 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1470 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1476 case LTTNG_KERNEL_ABI_FUNCTION
:
1478 case LTTNG_KERNEL_ABI_NOOP
:
1484 event
->priv
->registered
= 1;
1487 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1489 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1490 const struct lttng_kernel_event_desc
*desc
;
1493 if (!event_priv
->registered
)
1496 desc
= event_priv
->desc
;
1497 switch (event_priv
->instrumentation
) {
1498 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1499 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1500 event_priv
->desc
->tp_class
->probe_callback
,
1504 case LTTNG_KERNEL_ABI_KPROBE
:
1505 lttng_kprobes_unregister_event(event
);
1509 case LTTNG_KERNEL_ABI_KRETPROBE
:
1510 switch (event
->type
) {
1511 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1512 lttng_kretprobes_unregister(event
);
1515 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1521 case LTTNG_KERNEL_ABI_SYSCALL
:
1522 ret
= lttng_syscall_filter_disable_event(event
);
1525 case LTTNG_KERNEL_ABI_NOOP
:
1526 switch (event
->type
) {
1527 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1530 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1536 case LTTNG_KERNEL_ABI_UPROBE
:
1537 lttng_uprobes_unregister_event(event
);
1541 case LTTNG_KERNEL_ABI_FUNCTION
:
1547 event_priv
->registered
= 0;
1552 * Only used internally at session destruction.
1555 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1557 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1558 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1560 lttng_free_event_filter_runtime(event
);
1561 /* Free event enabler refs */
1562 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1563 &event_priv
->enablers_ref_head
, node
)
1566 switch (event
->type
) {
1567 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1569 struct lttng_kernel_event_recorder
*event_recorder
=
1570 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1572 switch (event_priv
->instrumentation
) {
1573 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1574 lttng_event_desc_put(event_priv
->desc
);
1577 case LTTNG_KERNEL_ABI_KPROBE
:
1578 module_put(event_priv
->desc
->owner
);
1579 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1582 case LTTNG_KERNEL_ABI_KRETPROBE
:
1583 module_put(event_priv
->desc
->owner
);
1584 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1587 case LTTNG_KERNEL_ABI_SYSCALL
:
1590 case LTTNG_KERNEL_ABI_UPROBE
:
1591 module_put(event_priv
->desc
->owner
);
1592 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1595 case LTTNG_KERNEL_ABI_FUNCTION
:
1597 case LTTNG_KERNEL_ABI_NOOP
:
1602 list_del(&event_recorder
->priv
->node
);
1603 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1604 kmem_cache_free(event_recorder_cache
, event_recorder
);
1607 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1609 struct lttng_kernel_event_notifier
*event_notifier
=
1610 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1612 switch (event_notifier
->priv
->parent
.instrumentation
) {
1613 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1614 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1617 case LTTNG_KERNEL_ABI_KPROBE
:
1618 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1619 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1622 case LTTNG_KERNEL_ABI_SYSCALL
:
1625 case LTTNG_KERNEL_ABI_UPROBE
:
1626 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1627 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1630 case LTTNG_KERNEL_ABI_KRETPROBE
:
1632 case LTTNG_KERNEL_ABI_FUNCTION
:
1634 case LTTNG_KERNEL_ABI_NOOP
:
1639 list_del(&event_notifier
->priv
->node
);
1640 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1641 kmem_cache_free(event_notifier_cache
, event_notifier
);
1649 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1650 enum tracker_type tracker_type
)
1652 switch (tracker_type
) {
1654 return &session
->pid_tracker
;
1656 return &session
->vpid_tracker
;
1658 return &session
->uid_tracker
;
1660 return &session
->vuid_tracker
;
1662 return &session
->gid_tracker
;
1664 return &session
->vgid_tracker
;
1671 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1672 enum tracker_type tracker_type
, int id
)
1674 struct lttng_kernel_id_tracker
*tracker
;
1677 tracker
= get_tracker(session
, tracker_type
);
1682 mutex_lock(&sessions_mutex
);
1684 /* track all ids: destroy tracker. */
1685 lttng_id_tracker_destroy(tracker
, true);
1688 ret
= lttng_id_tracker_add(tracker
, id
);
1690 mutex_unlock(&sessions_mutex
);
1694 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1695 enum tracker_type tracker_type
, int id
)
1697 struct lttng_kernel_id_tracker
*tracker
;
1700 tracker
= get_tracker(session
, tracker_type
);
1705 mutex_lock(&sessions_mutex
);
1707 /* untrack all ids: replace by empty tracker. */
1708 ret
= lttng_id_tracker_empty_set(tracker
);
1710 ret
= lttng_id_tracker_del(tracker
, id
);
1712 mutex_unlock(&sessions_mutex
);
1717 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1719 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1720 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1721 struct lttng_id_hash_node
*e
;
1724 mutex_lock(&sessions_mutex
);
1726 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1727 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1729 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1735 /* ID tracker disabled. */
1736 if (iter
>= *pos
&& iter
== 0) {
1737 return id_tracker_p
; /* empty tracker */
1745 /* Called with sessions_mutex held. */
1747 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1749 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1750 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1751 struct lttng_id_hash_node
*e
;
1756 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1757 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1759 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1760 if (iter
++ >= *ppos
)
1765 /* ID tracker disabled. */
1766 if (iter
>= *ppos
&& iter
== 0)
1767 return p
; /* empty tracker */
1776 void id_list_stop(struct seq_file
*m
, void *p
)
1778 mutex_unlock(&sessions_mutex
);
1782 int id_list_show(struct seq_file
*m
, void *p
)
1784 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1785 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1788 if (p
== id_tracker_p
) {
1789 /* Tracker disabled. */
1792 const struct lttng_id_hash_node
*e
= p
;
1794 id
= lttng_id_tracker_get_node_id(e
);
1796 switch (id_tracker
->priv
->tracker_type
) {
1798 seq_printf(m
, "process { pid = %d; };\n", id
);
1801 seq_printf(m
, "process { vpid = %d; };\n", id
);
1804 seq_printf(m
, "user { uid = %d; };\n", id
);
1807 seq_printf(m
, "user { vuid = %d; };\n", id
);
1810 seq_printf(m
, "group { gid = %d; };\n", id
);
1813 seq_printf(m
, "group { vgid = %d; };\n", id
);
1816 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1822 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1823 .start
= id_list_start
,
1824 .next
= id_list_next
,
1825 .stop
= id_list_stop
,
1826 .show
= id_list_show
,
1830 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1832 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1836 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1838 struct seq_file
*m
= file
->private_data
;
1839 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1842 WARN_ON_ONCE(!id_tracker
);
1843 ret
= seq_release(inode
, file
);
1845 fput(id_tracker
->priv
->session
->priv
->file
);
1849 const struct file_operations lttng_tracker_ids_list_fops
= {
1850 .owner
= THIS_MODULE
,
1851 .open
= lttng_tracker_ids_list_open
,
1853 .llseek
= seq_lseek
,
1854 .release
= lttng_tracker_ids_list_release
,
1857 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1858 enum tracker_type tracker_type
)
1860 struct file
*tracker_ids_list_file
;
1864 file_fd
= lttng_get_unused_fd();
1870 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1871 <tng_tracker_ids_list_fops
,
1873 if (IS_ERR(tracker_ids_list_file
)) {
1874 ret
= PTR_ERR(tracker_ids_list_file
);
1877 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1879 goto refcount_error
;
1881 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1884 m
= tracker_ids_list_file
->private_data
;
1886 m
->private = get_tracker(session
, tracker_type
);
1887 BUG_ON(!m
->private);
1888 fd_install(file_fd
, tracker_ids_list_file
);
1893 atomic_long_dec(&session
->priv
->file
->f_count
);
1895 fput(tracker_ids_list_file
);
1897 put_unused_fd(file_fd
);
1903 * Enabler management.
1906 int lttng_match_enabler_star_glob(const char *desc_name
,
1907 const char *pattern
)
1909 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1910 desc_name
, LTTNG_SIZE_MAX
))
1916 int lttng_match_enabler_name(const char *desc_name
,
1919 if (strcmp(desc_name
, name
))
1924 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1925 struct lttng_event_enabler_common
*enabler
)
1927 const char *desc_name
, *enabler_name
;
1928 bool compat
= false, entry
= false;
1930 enabler_name
= enabler
->event_param
.name
;
1931 switch (enabler
->event_param
.instrumentation
) {
1932 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1933 desc_name
= desc
->event_name
;
1934 switch (enabler
->format_type
) {
1935 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1936 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1937 case LTTNG_ENABLER_FORMAT_NAME
:
1938 return lttng_match_enabler_name(desc_name
, enabler_name
);
1944 case LTTNG_KERNEL_ABI_SYSCALL
:
1945 desc_name
= desc
->event_name
;
1946 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1947 desc_name
+= strlen("compat_");
1950 if (!strncmp(desc_name
, "syscall_exit_",
1951 strlen("syscall_exit_"))) {
1952 desc_name
+= strlen("syscall_exit_");
1953 } else if (!strncmp(desc_name
, "syscall_entry_",
1954 strlen("syscall_entry_"))) {
1955 desc_name
+= strlen("syscall_entry_");
1961 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1962 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1964 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1968 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1975 switch (enabler
->event_param
.u
.syscall
.abi
) {
1976 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1978 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1982 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1989 switch (enabler
->event_param
.u
.syscall
.match
) {
1990 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1991 switch (enabler
->format_type
) {
1992 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1993 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1994 case LTTNG_ENABLER_FORMAT_NAME
:
1995 return lttng_match_enabler_name(desc_name
, enabler_name
);
2000 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2001 return -EINVAL
; /* Not implemented. */
2014 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2015 struct lttng_kernel_event_common
*event
)
2017 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2020 switch (event_enabler
->enabler_type
) {
2021 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2023 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2024 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2025 struct lttng_kernel_event_recorder
*event_recorder
=
2026 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2028 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2029 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2034 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2036 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2037 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2038 struct lttng_kernel_event_notifier
*event_notifier
=
2039 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2041 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2042 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2043 && event
->priv
->user_token
== event_enabler
->user_token
)
2055 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2056 const struct lttng_kernel_event_desc
*desc
,
2057 struct lttng_kernel_event_common
*event
)
2059 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2062 switch (event_enabler
->enabler_type
) {
2063 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2065 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2066 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2067 struct lttng_kernel_event_recorder
*event_recorder
=
2068 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2070 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2075 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2077 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2078 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2079 struct lttng_kernel_event_notifier
*event_notifier
=
2080 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2082 if (event
->priv
->desc
== desc
2083 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2084 && event
->priv
->user_token
== event_enabler
->user_token
)
2096 struct lttng_enabler_ref
*lttng_enabler_ref(
2097 struct list_head
*enablers_ref_list
,
2098 struct lttng_event_enabler_common
*enabler
)
2100 struct lttng_enabler_ref
*enabler_ref
;
2102 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2103 if (enabler_ref
->ref
== enabler
)
2110 void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2112 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
2113 struct lttng_kernel_probe_desc
*probe_desc
;
2114 const struct lttng_kernel_event_desc
*desc
;
2116 struct list_head
*probe_list
;
2118 probe_list
= lttng_get_probe_list_head();
2120 * For each probe event, if we find that a probe event matches
2121 * our enabler, create an associated lttng_event if not
2124 list_for_each_entry(probe_desc
, probe_list
, head
) {
2125 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2127 struct hlist_head
*head
;
2128 struct lttng_kernel_event_recorder
*event_recorder
;
2129 struct lttng_kernel_event_common_private
*event_priv
;
2131 desc
= probe_desc
->event_desc
[i
];
2132 if (!lttng_desc_match_enabler(desc
,
2133 lttng_event_recorder_enabler_as_enabler(event_enabler
)))
2137 * Check if already created.
2139 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2140 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2141 if (lttng_event_enabler_desc_match_event(&event_enabler
->parent
, desc
, event_priv
->pub
))
2148 * We need to create an event for this
2151 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
2152 if (!event_recorder
) {
2153 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2154 probe_desc
->event_desc
[i
]->event_name
);
2161 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2163 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_notifier_enabler
->parent
);
2164 struct lttng_kernel_probe_desc
*probe_desc
;
2165 const struct lttng_kernel_event_desc
*desc
;
2167 struct list_head
*probe_list
;
2169 probe_list
= lttng_get_probe_list_head();
2171 * For each probe event, if we find that a probe event matches
2172 * our enabler, create an associated lttng_event_notifier if not
2175 list_for_each_entry(probe_desc
, probe_list
, head
) {
2176 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2178 struct hlist_head
*head
;
2179 struct lttng_kernel_event_notifier
*event_notifier
;
2180 struct lttng_kernel_event_common_private
*event_priv
;
2182 desc
= probe_desc
->event_desc
[i
];
2183 if (!lttng_desc_match_enabler(desc
,
2184 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2188 * Check if already created.
2190 head
= utils_borrow_hash_table_bucket(events_ht
->table
,
2191 LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2192 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2193 if (lttng_event_enabler_desc_match_event(&event_notifier_enabler
->parent
, desc
, event_priv
->pub
))
2200 * We need to create a event_notifier for this event probe.
2202 event_notifier
= _lttng_event_notifier_create(event_notifier_enabler
, desc
);
2203 if (IS_ERR(event_notifier
)) {
2204 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2205 probe_desc
->event_desc
[i
]->event_name
);
2212 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2216 ret
= lttng_syscalls_register_event(event_enabler
);
2221 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2222 * tracepoint probes.
2223 * Should be called with sessions mutex held.
2226 void lttng_create_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2228 switch (event_enabler
->parent
.event_param
.instrumentation
) {
2229 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2230 lttng_create_tracepoint_event_if_missing(event_enabler
);
2233 case LTTNG_KERNEL_ABI_SYSCALL
:
2234 lttng_create_syscall_event_if_missing(&event_enabler
->parent
);
2244 * Create events associated with an event_enabler (if not already present),
2245 * and add backward reference from the event to the enabler.
2246 * Should be called with sessions mutex held.
2249 int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler
*event_enabler
)
2251 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2252 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2253 struct lttng_event_enabler_common
*base_enabler
= lttng_event_recorder_enabler_as_enabler(event_enabler
);
2254 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2256 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2257 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2258 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2259 !strcmp(base_enabler
->event_param
.name
, "*")) {
2260 int enabled
= base_enabler
->enabled
;
2261 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2263 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2264 WRITE_ONCE(chan
->priv
->parent
.syscall_table
.syscall_all_entry
, enabled
);
2266 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2267 WRITE_ONCE(chan
->priv
->parent
.syscall_table
.syscall_all_exit
, enabled
);
2270 /* First ensure that probe events are created for this enabler. */
2271 lttng_create_event_if_missing(event_enabler
);
2273 /* For each event matching event_enabler in session event list. */
2274 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2275 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2276 struct lttng_enabler_ref
*enabler_ref
;
2278 if (!lttng_event_enabler_match_event(&event_enabler
->parent
, &event_recorder
->parent
))
2280 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2281 lttng_event_recorder_enabler_as_enabler(event_enabler
));
2284 * If no backward ref, create it.
2285 * Add backward ref from event to event_enabler.
2287 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2290 enabler_ref
->ref
= lttng_event_recorder_enabler_as_enabler(event_enabler
);
2291 list_add(&enabler_ref
->node
,
2292 &event_recorder_priv
->parent
.enablers_ref_head
);
2296 * Link filter bytecodes if not linked yet.
2298 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2300 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2301 <tng_event_recorder_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2307 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2308 * tracepoint probes.
2309 * Should be called with sessions mutex held.
2312 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2314 switch (event_notifier_enabler
->parent
.event_param
.instrumentation
) {
2315 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2316 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2319 case LTTNG_KERNEL_ABI_SYSCALL
:
2320 lttng_create_syscall_event_if_missing(&event_notifier_enabler
->parent
);
2330 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2333 int lttng_event_notifier_enabler_ref_event_notifiers(
2334 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2336 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2337 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2338 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2340 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2341 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2342 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2343 !strcmp(base_enabler
->event_param
.name
, "*")) {
2345 int enabled
= base_enabler
->enabled
;
2346 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2348 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2349 WRITE_ONCE(event_notifier_group
->syscall_table
.syscall_all_entry
, enabled
);
2351 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2352 WRITE_ONCE(event_notifier_group
->syscall_table
.syscall_all_exit
, enabled
);
2356 /* First ensure that probe event_notifiers are created for this enabler. */
2357 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2359 /* Link the created event_notifier with its associated enabler. */
2360 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2361 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2362 struct lttng_enabler_ref
*enabler_ref
;
2364 if (!lttng_event_enabler_match_event(&event_notifier_enabler
->parent
, &event_notifier
->parent
))
2367 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2368 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2371 * If no backward ref, create it.
2372 * Add backward ref from event_notifier to enabler.
2374 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2378 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2379 event_notifier_enabler
);
2380 list_add(&enabler_ref
->node
,
2381 &event_notifier_priv
->parent
.enablers_ref_head
);
2385 * Link filter bytecodes if not linked yet.
2387 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2388 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2389 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2391 /* Link capture bytecodes if not linked yet. */
2392 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2393 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2394 &event_notifier_enabler
->capture_bytecode_head
);
2396 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2402 * Called at module load: connect the probe on all enablers matching
2404 * Called with sessions lock held.
2406 int lttng_fix_pending_events(void)
2408 struct lttng_kernel_session_private
*session_priv
;
2410 list_for_each_entry(session_priv
, &sessions
, list
)
2411 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2415 static bool lttng_event_notifier_group_has_active_event_notifiers(
2416 struct lttng_event_notifier_group
*event_notifier_group
)
2418 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2420 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2422 if (event_notifier_enabler
->parent
.enabled
)
2428 bool lttng_event_notifier_active(void)
2430 struct lttng_event_notifier_group
*event_notifier_group
;
2432 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2433 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2439 int lttng_fix_pending_event_notifiers(void)
2441 struct lttng_event_notifier_group
*event_notifier_group
;
2443 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2444 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2448 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2449 enum lttng_enabler_format_type format_type
,
2450 struct lttng_kernel_abi_event
*event_param
,
2451 struct lttng_kernel_channel_buffer
*chan
)
2453 struct lttng_event_recorder_enabler
*event_enabler
;
2455 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2458 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2459 event_enabler
->parent
.format_type
= format_type
;
2460 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2461 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2462 sizeof(event_enabler
->parent
.event_param
));
2463 event_enabler
->chan
= chan
;
2465 event_enabler
->parent
.enabled
= 0;
2466 return event_enabler
;
2469 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2470 struct lttng_event_recorder_enabler
*event_enabler
)
2472 mutex_lock(&sessions_mutex
);
2473 list_add(&event_enabler
->node
, &session
->priv
->enablers_head
);
2474 event_enabler
->published
= true;
2475 lttng_session_lazy_sync_event_enablers(session
);
2476 mutex_unlock(&sessions_mutex
);
2479 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2481 mutex_lock(&sessions_mutex
);
2482 event_enabler
->enabled
= 1;
2483 lttng_event_enabler_sync(event_enabler
);
2484 mutex_unlock(&sessions_mutex
);
2488 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2490 mutex_lock(&sessions_mutex
);
2491 event_enabler
->enabled
= 0;
2492 lttng_event_enabler_sync(event_enabler
);
2493 mutex_unlock(&sessions_mutex
);
2498 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2499 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2501 struct lttng_kernel_bytecode_node
*bytecode_node
;
2502 uint32_t bytecode_len
;
2505 ret
= get_user(bytecode_len
, &bytecode
->len
);
2508 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2512 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2513 sizeof(*bytecode
) + bytecode_len
);
2517 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2518 bytecode_node
->enabler
= enabler
;
2519 /* Enforce length based on allocated size */
2520 bytecode_node
->bc
.len
= bytecode_len
;
2521 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2526 lttng_kvfree(bytecode_node
);
2530 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2531 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2534 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2537 lttng_event_enabler_sync(event_enabler
);
2544 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2545 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2548 switch (event
->priv
->instrumentation
) {
2549 case LTTNG_KERNEL_ABI_UPROBE
:
2550 return lttng_uprobes_event_add_callsite(event
, callsite
);
2557 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2559 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2561 /* Destroy filter bytecode */
2562 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2563 &enabler
->filter_bytecode_head
, node
) {
2564 lttng_kvfree(filter_node
);
2568 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2570 switch (event_enabler
->enabler_type
) {
2571 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2573 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2574 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2576 lttng_enabler_destroy(event_enabler
);
2577 if (event_recorder_enabler
->published
)
2578 list_del(&event_recorder_enabler
->node
);
2579 kfree(event_recorder_enabler
);
2582 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2584 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2585 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2587 lttng_enabler_destroy(event_enabler
);
2588 if (event_notifier_enabler
->published
)
2589 list_del(&event_notifier_enabler
->node
);
2590 kfree(event_notifier_enabler
);
2598 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2599 enum lttng_enabler_format_type format_type
,
2600 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2601 struct lttng_event_notifier_group
*event_notifier_group
)
2603 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2605 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2606 if (!event_notifier_enabler
)
2609 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2610 event_notifier_enabler
->parent
.format_type
= format_type
;
2611 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2612 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2614 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2615 event_notifier_enabler
->num_captures
= 0;
2617 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2618 sizeof(event_notifier_enabler
->parent
.event_param
));
2620 event_notifier_enabler
->parent
.enabled
= 0;
2621 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2622 event_notifier_enabler
->group
= event_notifier_group
;
2623 return event_notifier_enabler
;
2626 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2627 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2629 mutex_lock(&sessions_mutex
);
2630 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2631 event_notifier_enabler
->published
= true;
2632 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2633 mutex_unlock(&sessions_mutex
);
2636 int lttng_event_notifier_enabler_enable(
2637 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2639 mutex_lock(&sessions_mutex
);
2640 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2641 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2642 mutex_unlock(&sessions_mutex
);
2646 int lttng_event_notifier_enabler_disable(
2647 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2649 mutex_lock(&sessions_mutex
);
2650 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2651 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2652 mutex_unlock(&sessions_mutex
);
2656 int lttng_event_notifier_enabler_attach_capture_bytecode(
2657 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2658 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2660 struct lttng_kernel_bytecode_node
*bytecode_node
;
2661 struct lttng_event_enabler_common
*enabler
=
2662 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2663 uint32_t bytecode_len
;
2666 ret
= get_user(bytecode_len
, &bytecode
->len
);
2670 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2675 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2676 sizeof(*bytecode
) + bytecode_len
);
2680 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2681 bytecode_node
->enabler
= enabler
;
2683 /* Enforce length based on allocated size */
2684 bytecode_node
->bc
.len
= bytecode_len
;
2685 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2687 event_notifier_enabler
->num_captures
++;
2689 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2693 lttng_kvfree(bytecode_node
);
2699 * lttng_session_sync_event_enablers should be called just before starting a
2701 * Should be called with sessions mutex held.
2704 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2706 struct lttng_event_recorder_enabler
*event_enabler
;
2707 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2709 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2710 lttng_event_enabler_ref_events(event_enabler
);
2712 * For each event, if at least one of its enablers is enabled,
2713 * and its channel and session transient states are enabled, we
2714 * enable the event, else we disable it.
2716 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2717 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2718 struct lttng_enabler_ref
*enabler_ref
;
2719 struct lttng_kernel_bytecode_runtime
*runtime
;
2720 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2723 switch (event_recorder_priv
->parent
.instrumentation
) {
2724 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2726 case LTTNG_KERNEL_ABI_SYSCALL
:
2728 list_for_each_entry(enabler_ref
,
2729 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2730 if (enabler_ref
->ref
->enabled
) {
2738 /* Not handled with lazy sync. */
2742 * Enabled state is based on union of enablers, with
2743 * intesection of session and channel transient enable
2746 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2748 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2750 * Sync tracepoint registration with event enabled
2754 register_event(&event_recorder
->parent
);
2756 _lttng_event_unregister(&event_recorder
->parent
);
2759 /* Check if has enablers without bytecode enabled */
2760 list_for_each_entry(enabler_ref
,
2761 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2762 if (enabler_ref
->ref
->enabled
2763 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2764 has_enablers_without_filter_bytecode
= 1;
2768 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2769 has_enablers_without_filter_bytecode
;
2771 /* Enable filters */
2772 list_for_each_entry(runtime
,
2773 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2774 lttng_bytecode_sync_state(runtime
);
2777 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2778 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2783 * Apply enablers to session events, adding events to session if need
2784 * be. It is required after each modification applied to an active
2785 * session, and right before session "start".
2786 * "lazy" sync means we only sync if required.
2787 * Should be called with sessions mutex held.
2790 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2792 /* We can skip if session is not active */
2793 if (!session
->active
)
2795 lttng_session_sync_event_enablers(session
);
2799 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2801 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2802 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2804 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2805 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2808 * For each event_notifier, if at least one of its enablers is enabled,
2809 * we enable the event_notifier, else we disable it.
2811 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2812 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2813 struct lttng_enabler_ref
*enabler_ref
;
2814 struct lttng_kernel_bytecode_runtime
*runtime
;
2815 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2816 int nr_filters
= 0, nr_captures
= 0;
2818 switch (event_notifier_priv
->parent
.instrumentation
) {
2819 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2821 case LTTNG_KERNEL_ABI_SYSCALL
:
2822 /* Enable event_notifiers */
2823 list_for_each_entry(enabler_ref
,
2824 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2825 if (enabler_ref
->ref
->enabled
) {
2833 /* Not handled with sync. */
2837 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2839 * Sync tracepoint registration with event_notifier enabled
2843 if (!event_notifier_priv
->parent
.registered
)
2844 register_event(&event_notifier
->parent
);
2846 if (event_notifier_priv
->parent
.registered
)
2847 _lttng_event_unregister(&event_notifier
->parent
);
2850 /* Check if has enablers without bytecode enabled */
2851 list_for_each_entry(enabler_ref
,
2852 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2853 if (enabler_ref
->ref
->enabled
2854 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2855 has_enablers_without_filter_bytecode
= 1;
2859 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2860 has_enablers_without_filter_bytecode
;
2862 /* Enable filters */
2863 list_for_each_entry(runtime
,
2864 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2865 lttng_bytecode_sync_state(runtime
);
2868 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2869 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2871 /* Enable captures */
2872 list_for_each_entry(runtime
,
2873 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2874 lttng_bytecode_sync_state(runtime
);
2877 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2882 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2884 switch (event_enabler
->enabler_type
) {
2885 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2887 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2888 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2889 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2892 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2894 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2895 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2896 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2905 * Serialize at most one packet worth of metadata into a metadata
2907 * We grab the metadata cache mutex to get exclusive access to our metadata
2908 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2909 * allows us to do racy operations such as looking for remaining space left in
2910 * packet and write, since mutual exclusion protects us from concurrent writes.
2911 * Mutual exclusion on the metadata cache allow us to read the cache content
2912 * without racing against reallocation of the cache by updates.
2913 * Returns the number of bytes written in the channel, 0 if no data
2914 * was written and a negative value on error.
2916 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2917 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2919 struct lttng_kernel_ring_buffer_ctx ctx
;
2921 size_t len
, reserve_len
;
2924 * Ensure we support mutiple get_next / put sequences followed by
2925 * put_next. The metadata cache lock protects reading the metadata
2926 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2927 * "flush" operations on the buffer invoked by different processes.
2928 * Moreover, since the metadata cache memory can be reallocated, we
2929 * need to have exclusive access against updates even though we only
2932 mutex_lock(&stream
->metadata_cache
->lock
);
2933 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2934 if (stream
->metadata_in
!= stream
->metadata_out
)
2937 /* Metadata regenerated, change the version. */
2938 if (stream
->metadata_cache
->version
!= stream
->version
)
2939 stream
->version
= stream
->metadata_cache
->version
;
2941 len
= stream
->metadata_cache
->metadata_written
-
2942 stream
->metadata_in
;
2945 reserve_len
= min_t(size_t,
2946 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2948 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2949 sizeof(char), NULL
);
2951 * If reservation failed, return an error to the caller.
2953 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2955 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2956 stream
->coherent
= false;
2959 stream
->transport
->ops
.event_write(&ctx
,
2960 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2962 stream
->transport
->ops
.event_commit(&ctx
);
2963 stream
->metadata_in
+= reserve_len
;
2964 if (reserve_len
< len
)
2965 stream
->coherent
= false;
2967 stream
->coherent
= true;
2972 *coherent
= stream
->coherent
;
2973 mutex_unlock(&stream
->metadata_cache
->lock
);
2978 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2980 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2981 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2985 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2987 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2988 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2989 struct lttng_metadata_stream
*stream
;
2991 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2992 wake_up_interruptible(&stream
->read_wait
);
2993 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2998 * Write the metadata to the metadata cache.
2999 * Must be called with sessions_mutex held.
3000 * The metadata cache lock protects us from concurrent read access from
3001 * thread outputting metadata content to ring buffer.
3002 * The content of the printf is printed as a single atomic metadata
3005 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3006 const char *fmt
, ...)
3012 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3015 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3021 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3022 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3023 session
->priv
->metadata_cache
->cache_alloc
) {
3024 char *tmp_cache_realloc
;
3025 unsigned int tmp_cache_alloc_size
;
3027 tmp_cache_alloc_size
= max_t(unsigned int,
3028 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3029 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3030 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3031 if (!tmp_cache_realloc
)
3033 if (session
->priv
->metadata_cache
->data
) {
3034 memcpy(tmp_cache_realloc
,
3035 session
->priv
->metadata_cache
->data
,
3036 session
->priv
->metadata_cache
->cache_alloc
);
3037 vfree(session
->priv
->metadata_cache
->data
);
3040 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3041 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3043 memcpy(session
->priv
->metadata_cache
->data
+
3044 session
->priv
->metadata_cache
->metadata_written
,
3046 session
->priv
->metadata_cache
->metadata_written
+= len
;
3057 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3061 for (i
= 0; i
< nesting
; i
++) {
3064 ret
= lttng_metadata_printf(session
, " ");
3073 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3074 const struct lttng_kernel_event_field
*field
,
3077 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3081 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3082 const struct lttng_kernel_type_integer
*type
,
3083 enum lttng_kernel_string_encoding parent_encoding
,
3088 ret
= print_tabs(session
, nesting
);
3091 ret
= lttng_metadata_printf(session
,
3092 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3096 (parent_encoding
== lttng_kernel_string_encoding_none
)
3098 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3102 #if __BYTE_ORDER == __BIG_ENDIAN
3103 type
->reverse_byte_order
? " byte_order = le;" : ""
3105 type
->reverse_byte_order
? " byte_order = be;" : ""
3112 * Must be called with sessions_mutex held.
3115 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3116 const struct lttng_kernel_type_struct
*type
,
3119 const char *prev_field_name
= NULL
;
3121 uint32_t i
, nr_fields
;
3122 unsigned int alignment
;
3124 ret
= print_tabs(session
, nesting
);
3127 ret
= lttng_metadata_printf(session
,
3131 nr_fields
= type
->nr_fields
;
3132 for (i
= 0; i
< nr_fields
; i
++) {
3133 const struct lttng_kernel_event_field
*iter_field
;
3135 iter_field
= type
->fields
[i
];
3136 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3140 ret
= print_tabs(session
, nesting
);
3143 alignment
= type
->alignment
;
3145 ret
= lttng_metadata_printf(session
,
3149 ret
= lttng_metadata_printf(session
,
3156 * Must be called with sessions_mutex held.
3159 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3160 const struct lttng_kernel_event_field
*field
,
3165 ret
= _lttng_struct_type_statedump(session
,
3166 lttng_kernel_get_type_struct(field
->type
), nesting
);
3169 return lttng_field_name_statedump(session
, field
, nesting
);
3173 * Must be called with sessions_mutex held.
3176 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3177 const struct lttng_kernel_type_variant
*type
,
3179 const char *prev_field_name
)
3181 const char *tag_name
;
3183 uint32_t i
, nr_choices
;
3185 tag_name
= type
->tag_name
;
3187 tag_name
= prev_field_name
;
3191 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3193 if (type
->alignment
!= 0)
3195 ret
= print_tabs(session
, nesting
);
3198 ret
= lttng_metadata_printf(session
,
3199 "variant <_%s> {\n",
3203 nr_choices
= type
->nr_choices
;
3204 for (i
= 0; i
< nr_choices
; i
++) {
3205 const struct lttng_kernel_event_field
*iter_field
;
3207 iter_field
= type
->choices
[i
];
3208 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3212 ret
= print_tabs(session
, nesting
);
3215 ret
= lttng_metadata_printf(session
,
3221 * Must be called with sessions_mutex held.
3224 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3225 const struct lttng_kernel_event_field
*field
,
3227 const char *prev_field_name
)
3231 ret
= _lttng_variant_type_statedump(session
,
3232 lttng_kernel_get_type_variant(field
->type
), nesting
,
3236 return lttng_field_name_statedump(session
, field
, nesting
);
3240 * Must be called with sessions_mutex held.
3243 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3244 const struct lttng_kernel_event_field
*field
,
3248 const struct lttng_kernel_type_array
*array_type
;
3249 const struct lttng_kernel_type_common
*elem_type
;
3251 array_type
= lttng_kernel_get_type_array(field
->type
);
3252 WARN_ON_ONCE(!array_type
);
3254 if (array_type
->alignment
) {
3255 ret
= print_tabs(session
, nesting
);
3258 ret
= lttng_metadata_printf(session
,
3259 "struct { } align(%u) _%s_padding;\n",
3260 array_type
->alignment
* CHAR_BIT
,
3266 * Nested compound types: Only array of structures and variants are
3267 * currently supported.
3269 elem_type
= array_type
->elem_type
;
3270 switch (elem_type
->type
) {
3271 case lttng_kernel_type_integer
:
3272 case lttng_kernel_type_struct
:
3273 case lttng_kernel_type_variant
:
3274 ret
= _lttng_type_statedump(session
, elem_type
,
3275 array_type
->encoding
, nesting
);
3283 ret
= lttng_metadata_printf(session
,
3286 array_type
->length
);
3291 * Must be called with sessions_mutex held.
3294 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3295 const struct lttng_kernel_event_field
*field
,
3297 const char *prev_field_name
)
3300 const char *length_name
;
3301 const struct lttng_kernel_type_sequence
*sequence_type
;
3302 const struct lttng_kernel_type_common
*elem_type
;
3304 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3305 WARN_ON_ONCE(!sequence_type
);
3307 length_name
= sequence_type
->length_name
;
3309 length_name
= prev_field_name
;
3313 if (sequence_type
->alignment
) {
3314 ret
= print_tabs(session
, nesting
);
3317 ret
= lttng_metadata_printf(session
,
3318 "struct { } align(%u) _%s_padding;\n",
3319 sequence_type
->alignment
* CHAR_BIT
,
3326 * Nested compound types: Only array of structures and variants are
3327 * currently supported.
3329 elem_type
= sequence_type
->elem_type
;
3330 switch (elem_type
->type
) {
3331 case lttng_kernel_type_integer
:
3332 case lttng_kernel_type_struct
:
3333 case lttng_kernel_type_variant
:
3334 ret
= _lttng_type_statedump(session
, elem_type
,
3335 sequence_type
->encoding
, nesting
);
3343 ret
= lttng_metadata_printf(session
,
3351 * Must be called with sessions_mutex held.
3354 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3355 const struct lttng_kernel_type_enum
*type
,
3358 const struct lttng_kernel_enum_desc
*enum_desc
;
3359 const struct lttng_kernel_type_common
*container_type
;
3361 unsigned int i
, nr_entries
;
3363 container_type
= type
->container_type
;
3364 if (container_type
->type
!= lttng_kernel_type_integer
) {
3368 enum_desc
= type
->desc
;
3369 nr_entries
= enum_desc
->nr_entries
;
3371 ret
= print_tabs(session
, nesting
);
3374 ret
= lttng_metadata_printf(session
, "enum : ");
3377 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3378 lttng_kernel_string_encoding_none
, 0);
3381 ret
= lttng_metadata_printf(session
, " {\n");
3384 /* Dump all entries */
3385 for (i
= 0; i
< nr_entries
; i
++) {
3386 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3389 ret
= print_tabs(session
, nesting
+ 1);
3392 ret
= lttng_metadata_printf(session
,
3396 len
= strlen(entry
->string
);
3397 /* Escape the character '"' */
3398 for (j
= 0; j
< len
; j
++) {
3399 char c
= entry
->string
[j
];
3403 ret
= lttng_metadata_printf(session
,
3407 ret
= lttng_metadata_printf(session
,
3411 ret
= lttng_metadata_printf(session
,
3418 ret
= lttng_metadata_printf(session
, "\"");
3422 if (entry
->options
.is_auto
) {
3423 ret
= lttng_metadata_printf(session
, ",\n");
3427 ret
= lttng_metadata_printf(session
,
3431 if (entry
->start
.signedness
)
3432 ret
= lttng_metadata_printf(session
,
3433 "%lld", (long long) entry
->start
.value
);
3435 ret
= lttng_metadata_printf(session
,
3436 "%llu", entry
->start
.value
);
3439 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3441 == entry
->end
.value
) {
3442 ret
= lttng_metadata_printf(session
,
3445 if (entry
->end
.signedness
) {
3446 ret
= lttng_metadata_printf(session
,
3448 (long long) entry
->end
.value
);
3450 ret
= lttng_metadata_printf(session
,
3459 ret
= print_tabs(session
, nesting
);
3462 ret
= lttng_metadata_printf(session
, "}");
3468 * Must be called with sessions_mutex held.
3471 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3472 const struct lttng_kernel_event_field
*field
,
3476 const struct lttng_kernel_type_enum
*enum_type
;
3478 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3479 WARN_ON_ONCE(!enum_type
);
3480 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3483 return lttng_field_name_statedump(session
, field
, nesting
);
3487 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3488 const struct lttng_kernel_event_field
*field
,
3493 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3494 lttng_kernel_string_encoding_none
, nesting
);
3497 return lttng_field_name_statedump(session
, field
, nesting
);
3501 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3502 const struct lttng_kernel_type_string
*type
,
3507 /* Default encoding is UTF8 */
3508 ret
= print_tabs(session
, nesting
);
3511 ret
= lttng_metadata_printf(session
,
3513 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3514 " { encoding = ASCII; }" : "");
3519 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3520 const struct lttng_kernel_event_field
*field
,
3523 const struct lttng_kernel_type_string
*string_type
;
3526 string_type
= lttng_kernel_get_type_string(field
->type
);
3527 WARN_ON_ONCE(!string_type
);
3528 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3531 return lttng_field_name_statedump(session
, field
, nesting
);
3535 * Must be called with sessions_mutex held.
3538 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3539 const struct lttng_kernel_type_common
*type
,
3540 enum lttng_kernel_string_encoding parent_encoding
,
3545 switch (type
->type
) {
3546 case lttng_kernel_type_integer
:
3547 ret
= _lttng_integer_type_statedump(session
,
3548 lttng_kernel_get_type_integer(type
),
3549 parent_encoding
, nesting
);
3551 case lttng_kernel_type_enum
:
3552 ret
= _lttng_enum_type_statedump(session
,
3553 lttng_kernel_get_type_enum(type
),
3556 case lttng_kernel_type_string
:
3557 ret
= _lttng_string_type_statedump(session
,
3558 lttng_kernel_get_type_string(type
),
3561 case lttng_kernel_type_struct
:
3562 ret
= _lttng_struct_type_statedump(session
,
3563 lttng_kernel_get_type_struct(type
),
3566 case lttng_kernel_type_variant
:
3567 ret
= _lttng_variant_type_statedump(session
,
3568 lttng_kernel_get_type_variant(type
),
3572 /* Nested arrays and sequences are not supported yet. */
3573 case lttng_kernel_type_array
:
3574 case lttng_kernel_type_sequence
:
3583 * Must be called with sessions_mutex held.
3586 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3587 const struct lttng_kernel_event_field
*field
,
3589 const char **prev_field_name_p
)
3591 const char *prev_field_name
= NULL
;
3594 if (prev_field_name_p
)
3595 prev_field_name
= *prev_field_name_p
;
3596 switch (field
->type
->type
) {
3597 case lttng_kernel_type_integer
:
3598 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3600 case lttng_kernel_type_enum
:
3601 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3603 case lttng_kernel_type_string
:
3604 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3606 case lttng_kernel_type_struct
:
3607 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3609 case lttng_kernel_type_array
:
3610 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3612 case lttng_kernel_type_sequence
:
3613 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3615 case lttng_kernel_type_variant
:
3616 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3623 if (prev_field_name_p
)
3624 *prev_field_name_p
= field
->name
;
3629 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3630 struct lttng_kernel_ctx
*ctx
)
3632 const char *prev_field_name
= NULL
;
3638 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3639 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3641 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3649 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3650 struct lttng_kernel_event_recorder
*event_recorder
)
3652 const char *prev_field_name
= NULL
;
3653 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3657 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3658 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3660 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3668 * Must be called with sessions_mutex held.
3669 * The entire event metadata is printed as a single atomic metadata
3673 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3674 struct lttng_kernel_channel_buffer
*chan
,
3675 struct lttng_kernel_event_recorder
*event_recorder
)
3679 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3681 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3684 lttng_metadata_begin(session
);
3686 ret
= lttng_metadata_printf(session
,
3690 " stream_id = %u;\n",
3691 event_recorder
->priv
->parent
.desc
->event_name
,
3692 event_recorder
->priv
->id
,
3693 event_recorder
->chan
->priv
->id
);
3697 ret
= lttng_metadata_printf(session
,
3698 " fields := struct {\n"
3703 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3708 * LTTng space reservation can only reserve multiples of the
3711 ret
= lttng_metadata_printf(session
,
3717 event_recorder
->priv
->metadata_dumped
= 1;
3719 lttng_metadata_end(session
);
3725 * Must be called with sessions_mutex held.
3726 * The entire channel metadata is printed as a single atomic metadata
3730 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3731 struct lttng_kernel_channel_buffer
*chan
)
3735 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3738 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3741 lttng_metadata_begin(session
);
3743 WARN_ON_ONCE(!chan
->priv
->header_type
);
3744 ret
= lttng_metadata_printf(session
,
3747 " event.header := %s;\n"
3748 " packet.context := struct packet_context;\n",
3750 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3751 "struct event_header_large");
3755 if (chan
->priv
->ctx
) {
3756 ret
= lttng_metadata_printf(session
,
3757 " event.context := struct {\n");
3761 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3764 if (chan
->priv
->ctx
) {
3765 ret
= lttng_metadata_printf(session
,
3771 ret
= lttng_metadata_printf(session
,
3774 chan
->priv
->metadata_dumped
= 1;
3776 lttng_metadata_end(session
);
3781 * Must be called with sessions_mutex held.
3784 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3786 return lttng_metadata_printf(session
,
3787 "struct packet_context {\n"
3788 " uint64_clock_monotonic_t timestamp_begin;\n"
3789 " uint64_clock_monotonic_t timestamp_end;\n"
3790 " uint64_t content_size;\n"
3791 " uint64_t packet_size;\n"
3792 " uint64_t packet_seq_num;\n"
3793 " unsigned long events_discarded;\n"
3794 " uint32_t cpu_id;\n"
3801 * id: range: 0 - 30.
3802 * id 31 is reserved to indicate an extended header.
3805 * id: range: 0 - 65534.
3806 * id 65535 is reserved to indicate an extended header.
3808 * Must be called with sessions_mutex held.
3811 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3813 return lttng_metadata_printf(session
,
3814 "struct event_header_compact {\n"
3815 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3818 " uint27_clock_monotonic_t timestamp;\n"
3822 " uint64_clock_monotonic_t timestamp;\n"
3827 "struct event_header_large {\n"
3828 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3831 " uint32_clock_monotonic_t timestamp;\n"
3835 " uint64_clock_monotonic_t timestamp;\n"
3839 lttng_alignof(uint32_t) * CHAR_BIT
,
3840 lttng_alignof(uint16_t) * CHAR_BIT
3845 * Approximation of NTP time of day to clock monotonic correlation,
3846 * taken at start of trace.
3847 * Yes, this is only an approximation. Yes, we can (and will) do better
3848 * in future versions.
3849 * This function may return a negative offset. It may happen if the
3850 * system sets the REALTIME clock to 0 after boot.
3852 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3856 int64_t measure_clock_offset(void)
3858 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3859 uint64_t tcf
= trace_clock_freq();
3861 unsigned long flags
;
3862 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3863 struct timespec64 rts
= { 0, 0 };
3865 struct timespec rts
= { 0, 0 };
3868 /* Disable interrupts to increase correlation precision. */
3869 local_irq_save(flags
);
3870 monotonic
[0] = trace_clock_read64();
3871 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3872 ktime_get_real_ts64(&rts
);
3874 getnstimeofday(&rts
);
3876 monotonic
[1] = trace_clock_read64();
3877 local_irq_restore(flags
);
3879 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3880 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3881 if (tcf
== NSEC_PER_SEC
) {
3882 realtime
+= rts
.tv_nsec
;
3884 uint64_t n
= rts
.tv_nsec
* tcf
;
3886 do_div(n
, NSEC_PER_SEC
);
3889 offset
= (int64_t) realtime
- monotonic_avg
;
3894 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3902 while (cur
!= '\0') {
3905 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3909 ret
= lttng_metadata_printf(session
, "%c", '\\');
3912 /* We still print the current char */
3915 ret
= lttng_metadata_printf(session
, "%c", cur
);
3929 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3930 const char *field_value
)
3934 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3938 ret
= print_escaped_ctf_string(session
, field_value
);
3942 ret
= lttng_metadata_printf(session
, "\";\n");
3949 * Output metadata into this session's metadata buffers.
3950 * Must be called with sessions_mutex held.
3953 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3955 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3956 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3957 const char *product_uuid
;
3958 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3959 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3962 if (!LTTNG_READ_ONCE(session
->active
))
3965 lttng_metadata_begin(session
);
3967 if (session
->priv
->metadata_dumped
)
3970 snprintf(uuid_s
, sizeof(uuid_s
),
3971 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3972 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3973 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3974 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3975 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3977 ret
= lttng_metadata_printf(session
,
3978 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3979 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3980 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3981 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3982 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3983 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3984 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3990 " byte_order = %s;\n"
3991 " packet.header := struct {\n"
3992 " uint32_t magic;\n"
3993 " uint8_t uuid[16];\n"
3994 " uint32_t stream_id;\n"
3995 " uint64_t stream_instance_id;\n"
3998 lttng_alignof(uint8_t) * CHAR_BIT
,
3999 lttng_alignof(uint16_t) * CHAR_BIT
,
4000 lttng_alignof(uint32_t) * CHAR_BIT
,
4001 lttng_alignof(uint64_t) * CHAR_BIT
,
4002 sizeof(unsigned long) * CHAR_BIT
,
4003 lttng_alignof(unsigned long) * CHAR_BIT
,
4007 #if __BYTE_ORDER == __BIG_ENDIAN
4016 ret
= lttng_metadata_printf(session
,
4018 " hostname = \"%s\";\n"
4019 " domain = \"kernel\";\n"
4020 " sysname = \"%s\";\n"
4021 " kernel_release = \"%s\";\n"
4022 " kernel_version = \"%s\";\n"
4023 " tracer_name = \"lttng-modules\";\n"
4024 " tracer_major = %d;\n"
4025 " tracer_minor = %d;\n"
4026 " tracer_patchlevel = %d;\n"
4027 " trace_buffering_scheme = \"global\";\n",
4028 current
->nsproxy
->uts_ns
->name
.nodename
,
4032 LTTNG_MODULES_MAJOR_VERSION
,
4033 LTTNG_MODULES_MINOR_VERSION
,
4034 LTTNG_MODULES_PATCHLEVEL_VERSION
4039 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4042 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4043 session
->priv
->creation_time
);
4047 /* Add the product UUID to the 'env' section */
4048 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4050 ret
= lttng_metadata_printf(session
,
4051 " product_uuid = \"%s\";\n",
4058 /* Close the 'env' section */
4059 ret
= lttng_metadata_printf(session
, "};\n\n");
4063 ret
= lttng_metadata_printf(session
,
4065 " name = \"%s\";\n",
4071 if (!trace_clock_uuid(clock_uuid_s
)) {
4072 ret
= lttng_metadata_printf(session
,
4073 " uuid = \"%s\";\n",
4080 ret
= lttng_metadata_printf(session
,
4081 " description = \"%s\";\n"
4082 " freq = %llu; /* Frequency, in Hz */\n"
4083 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4086 trace_clock_description(),
4087 (unsigned long long) trace_clock_freq(),
4088 (long long) measure_clock_offset()
4093 ret
= lttng_metadata_printf(session
,
4094 "typealias integer {\n"
4095 " size = 27; align = 1; signed = false;\n"
4096 " map = clock.%s.value;\n"
4097 "} := uint27_clock_monotonic_t;\n"
4099 "typealias integer {\n"
4100 " size = 32; align = %u; signed = false;\n"
4101 " map = clock.%s.value;\n"
4102 "} := uint32_clock_monotonic_t;\n"
4104 "typealias integer {\n"
4105 " size = 64; align = %u; signed = false;\n"
4106 " map = clock.%s.value;\n"
4107 "} := uint64_clock_monotonic_t;\n\n",
4109 lttng_alignof(uint32_t) * CHAR_BIT
,
4111 lttng_alignof(uint64_t) * CHAR_BIT
,
4117 ret
= _lttng_stream_packet_context_declare(session
);
4121 ret
= _lttng_event_header_declare(session
);
4126 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4127 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4132 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4133 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4134 event_recorder_priv
->pub
);
4138 session
->priv
->metadata_dumped
= 1;
4140 lttng_metadata_end(session
);
4145 * lttng_transport_register - LTT transport registration
4146 * @transport: transport structure
4148 * Registers a transport which can be used as output to extract the data out of
4149 * LTTng. The module calling this registration function must ensure that no
4150 * trap-inducing code will be executed by the transport functions. E.g.
4151 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4152 * is made visible to the transport function. This registration acts as a
4153 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4154 * after its registration must it synchronize the TLBs.
4156 void lttng_transport_register(struct lttng_transport
*transport
)
4159 * Make sure no page fault can be triggered by the module about to be
4160 * registered. We deal with this here so we don't have to call
4161 * vmalloc_sync_mappings() in each module's init.
4163 wrapper_vmalloc_sync_mappings();
4165 mutex_lock(&sessions_mutex
);
4166 list_add_tail(&transport
->node
, <tng_transport_list
);
4167 mutex_unlock(&sessions_mutex
);
4169 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4172 * lttng_transport_unregister - LTT transport unregistration
4173 * @transport: transport structure
4175 void lttng_transport_unregister(struct lttng_transport
*transport
)
4177 mutex_lock(&sessions_mutex
);
4178 list_del(&transport
->node
);
4179 mutex_unlock(&sessions_mutex
);
4181 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4183 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4186 * Make sure no page fault can be triggered by the module about to be
4187 * registered. We deal with this here so we don't have to call
4188 * vmalloc_sync_mappings() in each module's init.
4190 wrapper_vmalloc_sync_mappings();
4192 mutex_lock(&sessions_mutex
);
4193 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4194 mutex_unlock(&sessions_mutex
);
4196 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4198 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4200 mutex_lock(&sessions_mutex
);
4201 list_del(&transport
->node
);
4202 mutex_unlock(&sessions_mutex
);
4204 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4206 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4208 enum cpuhp_state lttng_hp_prepare
;
4209 enum cpuhp_state lttng_hp_online
;
4211 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4213 struct lttng_cpuhp_node
*lttng_node
;
4215 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4216 switch (lttng_node
->component
) {
4217 case LTTNG_RING_BUFFER_FRONTEND
:
4219 case LTTNG_RING_BUFFER_BACKEND
:
4220 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4221 case LTTNG_RING_BUFFER_ITER
:
4223 case LTTNG_CONTEXT_PERF_COUNTERS
:
4230 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4232 struct lttng_cpuhp_node
*lttng_node
;
4234 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4235 switch (lttng_node
->component
) {
4236 case LTTNG_RING_BUFFER_FRONTEND
:
4237 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4238 case LTTNG_RING_BUFFER_BACKEND
:
4240 case LTTNG_RING_BUFFER_ITER
:
4242 case LTTNG_CONTEXT_PERF_COUNTERS
:
4243 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4249 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4251 struct lttng_cpuhp_node
*lttng_node
;
4253 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4254 switch (lttng_node
->component
) {
4255 case LTTNG_RING_BUFFER_FRONTEND
:
4256 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4257 case LTTNG_RING_BUFFER_BACKEND
:
4259 case LTTNG_RING_BUFFER_ITER
:
4260 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4261 case LTTNG_CONTEXT_PERF_COUNTERS
:
4262 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4268 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4270 struct lttng_cpuhp_node
*lttng_node
;
4272 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4273 switch (lttng_node
->component
) {
4274 case LTTNG_RING_BUFFER_FRONTEND
:
4275 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4276 case LTTNG_RING_BUFFER_BACKEND
:
4278 case LTTNG_RING_BUFFER_ITER
:
4280 case LTTNG_CONTEXT_PERF_COUNTERS
:
4287 static int __init
lttng_init_cpu_hotplug(void)
4291 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4292 lttng_hotplug_prepare
,
4293 lttng_hotplug_dead
);
4297 lttng_hp_prepare
= ret
;
4298 lttng_rb_set_hp_prepare(ret
);
4300 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4301 lttng_hotplug_online
,
4302 lttng_hotplug_offline
);
4304 cpuhp_remove_multi_state(lttng_hp_prepare
);
4305 lttng_hp_prepare
= 0;
4308 lttng_hp_online
= ret
;
4309 lttng_rb_set_hp_online(ret
);
4314 static void __exit
lttng_exit_cpu_hotplug(void)
4316 lttng_rb_set_hp_online(0);
4317 cpuhp_remove_multi_state(lttng_hp_online
);
4318 lttng_rb_set_hp_prepare(0);
4319 cpuhp_remove_multi_state(lttng_hp_prepare
);
4322 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4323 static int lttng_init_cpu_hotplug(void)
4327 static void lttng_exit_cpu_hotplug(void)
4330 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4332 static int __init
lttng_events_init(void)
4336 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4339 ret
= wrapper_get_pfnblock_flags_mask_init();
4342 ret
= wrapper_get_pageblock_flags_mask_init();
4345 ret
= lttng_probes_init();
4348 ret
= lttng_context_init();
4351 ret
= lttng_tracepoint_init();
4354 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4355 if (!event_recorder_cache
) {
4357 goto error_kmem_event_recorder
;
4359 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4360 if (!event_recorder_private_cache
) {
4362 goto error_kmem_event_recorder_private
;
4364 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4365 if (!event_notifier_cache
) {
4367 goto error_kmem_event_notifier
;
4369 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4370 if (!event_notifier_private_cache
) {
4372 goto error_kmem_event_notifier_private
;
4374 ret
= lttng_abi_init();
4377 ret
= lttng_logger_init();
4380 ret
= lttng_init_cpu_hotplug();
4383 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4384 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4385 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4386 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4387 LTTNG_MODULES_EXTRAVERSION
,
4389 #ifdef LTTNG_EXTRA_VERSION_GIT
4390 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4394 #ifdef LTTNG_EXTRA_VERSION_NAME
4395 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4399 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4400 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4401 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4405 lttng_logger_exit();
4409 kmem_cache_destroy(event_notifier_private_cache
);
4410 error_kmem_event_notifier_private
:
4411 kmem_cache_destroy(event_notifier_cache
);
4412 error_kmem_event_notifier
:
4413 kmem_cache_destroy(event_recorder_private_cache
);
4414 error_kmem_event_recorder_private
:
4415 kmem_cache_destroy(event_recorder_cache
);
4416 error_kmem_event_recorder
:
4417 lttng_tracepoint_exit();
4419 lttng_context_exit();
4420 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4421 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4422 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4423 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4424 LTTNG_MODULES_EXTRAVERSION
,
4426 #ifdef LTTNG_EXTRA_VERSION_GIT
4427 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4431 #ifdef LTTNG_EXTRA_VERSION_NAME
4432 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4439 module_init(lttng_events_init
);
4441 static void __exit
lttng_events_exit(void)
4443 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4445 lttng_exit_cpu_hotplug();
4446 lttng_logger_exit();
4448 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4449 lttng_session_destroy(session_priv
->pub
);
4450 kmem_cache_destroy(event_recorder_cache
);
4451 kmem_cache_destroy(event_recorder_private_cache
);
4452 kmem_cache_destroy(event_notifier_cache
);
4453 kmem_cache_destroy(event_notifier_private_cache
);
4454 lttng_tracepoint_exit();
4455 lttng_context_exit();
4456 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4457 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4458 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4459 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4460 LTTNG_MODULES_EXTRAVERSION
,
4462 #ifdef LTTNG_EXTRA_VERSION_GIT
4463 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4467 #ifdef LTTNG_EXTRA_VERSION_NAME
4468 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4474 module_exit(lttng_events_exit
);
4476 #include <generated/patches.h>
4477 #ifdef LTTNG_EXTRA_VERSION_GIT
4478 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4480 #ifdef LTTNG_EXTRA_VERSION_NAME
4481 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4483 MODULE_LICENSE("GPL and additional rights");
4484 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4485 MODULE_DESCRIPTION("LTTng tracer");
4486 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4487 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4488 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4489 LTTNG_MODULES_EXTRAVERSION
);