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 int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler
*event_enabler
,
2015 struct lttng_kernel_event_recorder
*event_recorder
)
2017 struct lttng_event_enabler_common
*base_enabler
= lttng_event_recorder_enabler_as_enabler(
2020 if (base_enabler
->event_param
.instrumentation
!= event_recorder
->priv
->parent
.instrumentation
)
2022 if (lttng_desc_match_enabler(event_recorder
->priv
->parent
.desc
, base_enabler
)
2023 && event_recorder
->chan
== event_enabler
->chan
)
2030 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2031 struct lttng_kernel_event_notifier
*event_notifier
)
2033 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
2034 event_notifier_enabler
);
2036 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->priv
->parent
.instrumentation
)
2038 if (lttng_desc_match_enabler(event_notifier
->priv
->parent
.desc
, base_enabler
)
2039 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2040 && event_notifier
->priv
->parent
.user_token
== event_notifier_enabler
->parent
.user_token
)
2047 struct lttng_enabler_ref
*lttng_enabler_ref(
2048 struct list_head
*enablers_ref_list
,
2049 struct lttng_event_enabler_common
*enabler
)
2051 struct lttng_enabler_ref
*enabler_ref
;
2053 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2054 if (enabler_ref
->ref
== enabler
)
2061 void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2063 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
2064 struct lttng_kernel_probe_desc
*probe_desc
;
2065 const struct lttng_kernel_event_desc
*desc
;
2067 struct list_head
*probe_list
;
2069 probe_list
= lttng_get_probe_list_head();
2071 * For each probe event, if we find that a probe event matches
2072 * our enabler, create an associated lttng_event if not
2075 list_for_each_entry(probe_desc
, probe_list
, head
) {
2076 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2078 struct hlist_head
*head
;
2079 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2080 struct lttng_kernel_event_recorder
*event_recorder
;
2081 struct lttng_kernel_event_common_private
*event_priv
;
2083 desc
= probe_desc
->event_desc
[i
];
2084 if (!lttng_desc_match_enabler(desc
,
2085 lttng_event_recorder_enabler_as_enabler(event_enabler
)))
2089 * Check if already created.
2091 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2092 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2093 event_recorder_priv
= container_of(event_priv
, struct lttng_kernel_event_recorder_private
, parent
);
2094 if (event_priv
->desc
== desc
2095 && event_recorder_priv
->pub
->chan
== event_enabler
->chan
)
2102 * We need to create an event for this
2105 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
2106 if (!event_recorder
) {
2107 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2108 probe_desc
->event_desc
[i
]->event_name
);
2115 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2117 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_notifier_enabler
->parent
);
2118 struct lttng_kernel_probe_desc
*probe_desc
;
2119 const struct lttng_kernel_event_desc
*desc
;
2121 struct list_head
*probe_list
;
2123 probe_list
= lttng_get_probe_list_head();
2125 * For each probe event, if we find that a probe event matches
2126 * our enabler, create an associated lttng_event_notifier if not
2129 list_for_each_entry(probe_desc
, probe_list
, head
) {
2130 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2132 struct hlist_head
*head
;
2133 struct lttng_kernel_event_notifier
*event_notifier
;
2134 struct lttng_kernel_event_common_private
*event_priv
;
2136 desc
= probe_desc
->event_desc
[i
];
2137 if (!lttng_desc_match_enabler(desc
,
2138 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2142 * Check if already created.
2144 head
= utils_borrow_hash_table_bucket(events_ht
->table
,
2145 LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2146 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2147 if (event_priv
->desc
== desc
2148 && event_priv
->user_token
== event_notifier_enabler
->parent
.user_token
)
2155 * We need to create a event_notifier for this event probe.
2157 event_notifier
= _lttng_event_notifier_create(event_notifier_enabler
, desc
);
2158 if (IS_ERR(event_notifier
)) {
2159 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2160 probe_desc
->event_desc
[i
]->event_name
);
2167 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2171 ret
= lttng_syscalls_register_event(event_enabler
);
2176 * Create struct lttng_kernel_event_recorder if it is missing and present in the list of
2177 * tracepoint probes.
2178 * Should be called with sessions mutex held.
2181 void lttng_create_event_if_missing(struct lttng_event_recorder_enabler
*event_enabler
)
2183 switch (event_enabler
->parent
.event_param
.instrumentation
) {
2184 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2185 lttng_create_tracepoint_event_if_missing(event_enabler
);
2188 case LTTNG_KERNEL_ABI_SYSCALL
:
2189 lttng_create_syscall_event_if_missing(&event_enabler
->parent
);
2199 * Create events associated with an event_enabler (if not already present),
2200 * and add backward reference from the event to the enabler.
2201 * Should be called with sessions mutex held.
2204 int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler
*event_enabler
)
2206 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
2207 struct lttng_kernel_session
*session
= event_enabler
->chan
->parent
.session
;
2208 struct lttng_event_enabler_common
*base_enabler
= lttng_event_recorder_enabler_as_enabler(event_enabler
);
2209 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2211 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2212 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2213 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2214 !strcmp(base_enabler
->event_param
.name
, "*")) {
2215 int enabled
= base_enabler
->enabled
;
2216 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2218 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2219 WRITE_ONCE(chan
->priv
->parent
.syscall_table
.syscall_all_entry
, enabled
);
2221 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2222 WRITE_ONCE(chan
->priv
->parent
.syscall_table
.syscall_all_exit
, enabled
);
2225 /* First ensure that probe events are created for this enabler. */
2226 lttng_create_event_if_missing(event_enabler
);
2228 /* For each event matching event_enabler in session event list. */
2229 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2230 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2231 struct lttng_enabler_ref
*enabler_ref
;
2233 if (!lttng_event_enabler_match_event(event_enabler
, event_recorder
))
2235 enabler_ref
= lttng_enabler_ref(&event_recorder_priv
->parent
.enablers_ref_head
,
2236 lttng_event_recorder_enabler_as_enabler(event_enabler
));
2239 * If no backward ref, create it.
2240 * Add backward ref from event to event_enabler.
2242 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2245 enabler_ref
->ref
= lttng_event_recorder_enabler_as_enabler(event_enabler
);
2246 list_add(&enabler_ref
->node
,
2247 &event_recorder_priv
->parent
.enablers_ref_head
);
2251 * Link filter bytecodes if not linked yet.
2253 lttng_enabler_link_bytecode(event_recorder_priv
->parent
.desc
,
2255 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
,
2256 <tng_event_recorder_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2262 * Create struct lttng_kernel_event_notifier if it is missing and present in the list of
2263 * tracepoint probes.
2264 * Should be called with sessions mutex held.
2267 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2269 switch (event_notifier_enabler
->parent
.event_param
.instrumentation
) {
2270 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2271 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2274 case LTTNG_KERNEL_ABI_SYSCALL
:
2275 lttng_create_syscall_event_if_missing(&event_notifier_enabler
->parent
);
2285 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2288 int lttng_event_notifier_enabler_ref_event_notifiers(
2289 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2291 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2292 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2293 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2295 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2296 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2297 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2298 !strcmp(base_enabler
->event_param
.name
, "*")) {
2300 int enabled
= base_enabler
->enabled
;
2301 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2303 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2304 WRITE_ONCE(event_notifier_group
->syscall_table
.syscall_all_entry
, enabled
);
2306 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2307 WRITE_ONCE(event_notifier_group
->syscall_table
.syscall_all_exit
, enabled
);
2311 /* First ensure that probe event_notifiers are created for this enabler. */
2312 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2314 /* Link the created event_notifier with its associated enabler. */
2315 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2316 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2317 struct lttng_enabler_ref
*enabler_ref
;
2319 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2322 enabler_ref
= lttng_enabler_ref(&event_notifier_priv
->parent
.enablers_ref_head
,
2323 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2326 * If no backward ref, create it.
2327 * Add backward ref from event_notifier to enabler.
2329 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2333 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2334 event_notifier_enabler
);
2335 list_add(&enabler_ref
->node
,
2336 &event_notifier_priv
->parent
.enablers_ref_head
);
2340 * Link filter bytecodes if not linked yet.
2342 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2343 lttng_static_ctx
, &event_notifier_priv
->parent
.filter_bytecode_runtime_head
,
2344 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2346 /* Link capture bytecodes if not linked yet. */
2347 lttng_enabler_link_bytecode(event_notifier_priv
->parent
.desc
,
2348 lttng_static_ctx
, &event_notifier_priv
->capture_bytecode_runtime_head
,
2349 &event_notifier_enabler
->capture_bytecode_head
);
2351 event_notifier_priv
->num_captures
= event_notifier_enabler
->num_captures
;
2357 * Called at module load: connect the probe on all enablers matching
2359 * Called with sessions lock held.
2361 int lttng_fix_pending_events(void)
2363 struct lttng_kernel_session_private
*session_priv
;
2365 list_for_each_entry(session_priv
, &sessions
, list
)
2366 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2370 static bool lttng_event_notifier_group_has_active_event_notifiers(
2371 struct lttng_event_notifier_group
*event_notifier_group
)
2373 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2375 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2377 if (event_notifier_enabler
->parent
.enabled
)
2383 bool lttng_event_notifier_active(void)
2385 struct lttng_event_notifier_group
*event_notifier_group
;
2387 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2388 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2394 int lttng_fix_pending_event_notifiers(void)
2396 struct lttng_event_notifier_group
*event_notifier_group
;
2398 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2399 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2403 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2404 enum lttng_enabler_format_type format_type
,
2405 struct lttng_kernel_abi_event
*event_param
,
2406 struct lttng_kernel_channel_buffer
*chan
)
2408 struct lttng_event_recorder_enabler
*event_enabler
;
2410 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2413 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2414 event_enabler
->parent
.format_type
= format_type
;
2415 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2416 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2417 sizeof(event_enabler
->parent
.event_param
));
2418 event_enabler
->chan
= chan
;
2420 event_enabler
->parent
.enabled
= 0;
2421 return event_enabler
;
2424 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2425 struct lttng_event_recorder_enabler
*event_enabler
)
2427 mutex_lock(&sessions_mutex
);
2428 list_add(&event_enabler
->node
, &session
->priv
->enablers_head
);
2429 event_enabler
->published
= true;
2430 lttng_session_lazy_sync_event_enablers(session
);
2431 mutex_unlock(&sessions_mutex
);
2434 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2436 mutex_lock(&sessions_mutex
);
2437 event_enabler
->enabled
= 1;
2438 lttng_event_enabler_sync(event_enabler
);
2439 mutex_unlock(&sessions_mutex
);
2443 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2445 mutex_lock(&sessions_mutex
);
2446 event_enabler
->enabled
= 0;
2447 lttng_event_enabler_sync(event_enabler
);
2448 mutex_unlock(&sessions_mutex
);
2453 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2454 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2456 struct lttng_kernel_bytecode_node
*bytecode_node
;
2457 uint32_t bytecode_len
;
2460 ret
= get_user(bytecode_len
, &bytecode
->len
);
2463 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2467 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2468 sizeof(*bytecode
) + bytecode_len
);
2472 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2473 bytecode_node
->enabler
= enabler
;
2474 /* Enforce length based on allocated size */
2475 bytecode_node
->bc
.len
= bytecode_len
;
2476 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2481 lttng_kvfree(bytecode_node
);
2485 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2486 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2489 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2492 lttng_event_enabler_sync(event_enabler
);
2499 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2500 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2503 switch (event
->priv
->instrumentation
) {
2504 case LTTNG_KERNEL_ABI_UPROBE
:
2505 return lttng_uprobes_event_add_callsite(event
, callsite
);
2512 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2514 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2516 /* Destroy filter bytecode */
2517 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2518 &enabler
->filter_bytecode_head
, node
) {
2519 lttng_kvfree(filter_node
);
2523 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2525 switch (event_enabler
->enabler_type
) {
2526 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2528 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2529 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2531 lttng_enabler_destroy(event_enabler
);
2532 if (event_recorder_enabler
->published
)
2533 list_del(&event_recorder_enabler
->node
);
2534 kfree(event_recorder_enabler
);
2537 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2539 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2540 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2542 lttng_enabler_destroy(event_enabler
);
2543 if (event_notifier_enabler
->published
)
2544 list_del(&event_notifier_enabler
->node
);
2545 kfree(event_notifier_enabler
);
2553 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2554 enum lttng_enabler_format_type format_type
,
2555 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2556 struct lttng_event_notifier_group
*event_notifier_group
)
2558 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2560 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2561 if (!event_notifier_enabler
)
2564 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2565 event_notifier_enabler
->parent
.format_type
= format_type
;
2566 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2567 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2569 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2570 event_notifier_enabler
->num_captures
= 0;
2572 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2573 sizeof(event_notifier_enabler
->parent
.event_param
));
2575 event_notifier_enabler
->parent
.enabled
= 0;
2576 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2577 event_notifier_enabler
->group
= event_notifier_group
;
2578 return event_notifier_enabler
;
2581 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2582 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2584 mutex_lock(&sessions_mutex
);
2585 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2586 event_notifier_enabler
->published
= true;
2587 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2588 mutex_unlock(&sessions_mutex
);
2591 int lttng_event_notifier_enabler_enable(
2592 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2594 mutex_lock(&sessions_mutex
);
2595 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2596 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2597 mutex_unlock(&sessions_mutex
);
2601 int lttng_event_notifier_enabler_disable(
2602 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2604 mutex_lock(&sessions_mutex
);
2605 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2606 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2607 mutex_unlock(&sessions_mutex
);
2611 int lttng_event_notifier_enabler_attach_capture_bytecode(
2612 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2613 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2615 struct lttng_kernel_bytecode_node
*bytecode_node
;
2616 struct lttng_event_enabler_common
*enabler
=
2617 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2618 uint32_t bytecode_len
;
2621 ret
= get_user(bytecode_len
, &bytecode
->len
);
2625 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2630 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2631 sizeof(*bytecode
) + bytecode_len
);
2635 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2636 bytecode_node
->enabler
= enabler
;
2638 /* Enforce length based on allocated size */
2639 bytecode_node
->bc
.len
= bytecode_len
;
2640 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2642 event_notifier_enabler
->num_captures
++;
2644 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2648 lttng_kvfree(bytecode_node
);
2654 * lttng_session_sync_event_enablers should be called just before starting a
2656 * Should be called with sessions mutex held.
2659 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2661 struct lttng_event_recorder_enabler
*event_enabler
;
2662 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
2664 list_for_each_entry(event_enabler
, &session
->priv
->enablers_head
, node
)
2665 lttng_event_enabler_ref_events(event_enabler
);
2667 * For each event, if at least one of its enablers is enabled,
2668 * and its channel and session transient states are enabled, we
2669 * enable the event, else we disable it.
2671 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
2672 struct lttng_kernel_event_recorder
*event_recorder
= event_recorder_priv
->pub
;
2673 struct lttng_enabler_ref
*enabler_ref
;
2674 struct lttng_kernel_bytecode_runtime
*runtime
;
2675 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2678 switch (event_recorder_priv
->parent
.instrumentation
) {
2679 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2681 case LTTNG_KERNEL_ABI_SYSCALL
:
2683 list_for_each_entry(enabler_ref
,
2684 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2685 if (enabler_ref
->ref
->enabled
) {
2693 /* Not handled with lazy sync. */
2697 * Enabled state is based on union of enablers, with
2698 * intesection of session and channel transient enable
2701 enabled
= enabled
&& session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2703 WRITE_ONCE(event_recorder
->parent
.enabled
, enabled
);
2705 * Sync tracepoint registration with event enabled
2709 register_event(&event_recorder
->parent
);
2711 _lttng_event_unregister(&event_recorder
->parent
);
2714 /* Check if has enablers without bytecode enabled */
2715 list_for_each_entry(enabler_ref
,
2716 &event_recorder_priv
->parent
.enablers_ref_head
, node
) {
2717 if (enabler_ref
->ref
->enabled
2718 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2719 has_enablers_without_filter_bytecode
= 1;
2723 event_recorder_priv
->parent
.has_enablers_without_filter_bytecode
=
2724 has_enablers_without_filter_bytecode
;
2726 /* Enable filters */
2727 list_for_each_entry(runtime
,
2728 &event_recorder_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2729 lttng_bytecode_sync_state(runtime
);
2732 WRITE_ONCE(event_recorder_priv
->parent
.pub
->eval_filter
,
2733 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2738 * Apply enablers to session events, adding events to session if need
2739 * be. It is required after each modification applied to an active
2740 * session, and right before session "start".
2741 * "lazy" sync means we only sync if required.
2742 * Should be called with sessions mutex held.
2745 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2747 /* We can skip if session is not active */
2748 if (!session
->active
)
2750 lttng_session_sync_event_enablers(session
);
2754 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2756 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2757 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
2759 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2760 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2763 * For each event_notifier, if at least one of its enablers is enabled,
2764 * we enable the event_notifier, else we disable it.
2766 list_for_each_entry(event_notifier_priv
, &event_notifier_group
->event_notifiers_head
, node
) {
2767 struct lttng_kernel_event_notifier
*event_notifier
= event_notifier_priv
->pub
;
2768 struct lttng_enabler_ref
*enabler_ref
;
2769 struct lttng_kernel_bytecode_runtime
*runtime
;
2770 int enabled
= 0, has_enablers_without_filter_bytecode
= 0;
2771 int nr_filters
= 0, nr_captures
= 0;
2773 switch (event_notifier_priv
->parent
.instrumentation
) {
2774 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2776 case LTTNG_KERNEL_ABI_SYSCALL
:
2777 /* Enable event_notifiers */
2778 list_for_each_entry(enabler_ref
,
2779 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2780 if (enabler_ref
->ref
->enabled
) {
2788 /* Not handled with sync. */
2792 WRITE_ONCE(event_notifier
->parent
.enabled
, enabled
);
2794 * Sync tracepoint registration with event_notifier enabled
2798 if (!event_notifier_priv
->parent
.registered
)
2799 register_event(&event_notifier
->parent
);
2801 if (event_notifier_priv
->parent
.registered
)
2802 _lttng_event_unregister(&event_notifier
->parent
);
2805 /* Check if has enablers without bytecode enabled */
2806 list_for_each_entry(enabler_ref
,
2807 &event_notifier_priv
->parent
.enablers_ref_head
, node
) {
2808 if (enabler_ref
->ref
->enabled
2809 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2810 has_enablers_without_filter_bytecode
= 1;
2814 event_notifier_priv
->parent
.has_enablers_without_filter_bytecode
=
2815 has_enablers_without_filter_bytecode
;
2817 /* Enable filters */
2818 list_for_each_entry(runtime
,
2819 &event_notifier_priv
->parent
.filter_bytecode_runtime_head
, node
) {
2820 lttng_bytecode_sync_state(runtime
);
2823 WRITE_ONCE(event_notifier_priv
->parent
.pub
->eval_filter
,
2824 !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2826 /* Enable captures */
2827 list_for_each_entry(runtime
,
2828 &event_notifier_priv
->capture_bytecode_runtime_head
, node
) {
2829 lttng_bytecode_sync_state(runtime
);
2832 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2837 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2839 switch (event_enabler
->enabler_type
) {
2840 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2842 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2843 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2844 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2847 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2849 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2850 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2851 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2860 * Serialize at most one packet worth of metadata into a metadata
2862 * We grab the metadata cache mutex to get exclusive access to our metadata
2863 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2864 * allows us to do racy operations such as looking for remaining space left in
2865 * packet and write, since mutual exclusion protects us from concurrent writes.
2866 * Mutual exclusion on the metadata cache allow us to read the cache content
2867 * without racing against reallocation of the cache by updates.
2868 * Returns the number of bytes written in the channel, 0 if no data
2869 * was written and a negative value on error.
2871 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2872 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2874 struct lttng_kernel_ring_buffer_ctx ctx
;
2876 size_t len
, reserve_len
;
2879 * Ensure we support mutiple get_next / put sequences followed by
2880 * put_next. The metadata cache lock protects reading the metadata
2881 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2882 * "flush" operations on the buffer invoked by different processes.
2883 * Moreover, since the metadata cache memory can be reallocated, we
2884 * need to have exclusive access against updates even though we only
2887 mutex_lock(&stream
->metadata_cache
->lock
);
2888 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2889 if (stream
->metadata_in
!= stream
->metadata_out
)
2892 /* Metadata regenerated, change the version. */
2893 if (stream
->metadata_cache
->version
!= stream
->version
)
2894 stream
->version
= stream
->metadata_cache
->version
;
2896 len
= stream
->metadata_cache
->metadata_written
-
2897 stream
->metadata_in
;
2900 reserve_len
= min_t(size_t,
2901 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2903 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2904 sizeof(char), NULL
);
2906 * If reservation failed, return an error to the caller.
2908 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2910 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2911 stream
->coherent
= false;
2914 stream
->transport
->ops
.event_write(&ctx
,
2915 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2917 stream
->transport
->ops
.event_commit(&ctx
);
2918 stream
->metadata_in
+= reserve_len
;
2919 if (reserve_len
< len
)
2920 stream
->coherent
= false;
2922 stream
->coherent
= true;
2927 *coherent
= stream
->coherent
;
2928 mutex_unlock(&stream
->metadata_cache
->lock
);
2933 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2935 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2936 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2940 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2942 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2943 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2944 struct lttng_metadata_stream
*stream
;
2946 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2947 wake_up_interruptible(&stream
->read_wait
);
2948 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2953 * Write the metadata to the metadata cache.
2954 * Must be called with sessions_mutex held.
2955 * The metadata cache lock protects us from concurrent read access from
2956 * thread outputting metadata content to ring buffer.
2957 * The content of the printf is printed as a single atomic metadata
2960 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2961 const char *fmt
, ...)
2967 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2970 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2976 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2977 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2978 session
->priv
->metadata_cache
->cache_alloc
) {
2979 char *tmp_cache_realloc
;
2980 unsigned int tmp_cache_alloc_size
;
2982 tmp_cache_alloc_size
= max_t(unsigned int,
2983 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2984 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2985 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2986 if (!tmp_cache_realloc
)
2988 if (session
->priv
->metadata_cache
->data
) {
2989 memcpy(tmp_cache_realloc
,
2990 session
->priv
->metadata_cache
->data
,
2991 session
->priv
->metadata_cache
->cache_alloc
);
2992 vfree(session
->priv
->metadata_cache
->data
);
2995 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2996 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2998 memcpy(session
->priv
->metadata_cache
->data
+
2999 session
->priv
->metadata_cache
->metadata_written
,
3001 session
->priv
->metadata_cache
->metadata_written
+= len
;
3012 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3016 for (i
= 0; i
< nesting
; i
++) {
3019 ret
= lttng_metadata_printf(session
, " ");
3028 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3029 const struct lttng_kernel_event_field
*field
,
3032 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3036 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3037 const struct lttng_kernel_type_integer
*type
,
3038 enum lttng_kernel_string_encoding parent_encoding
,
3043 ret
= print_tabs(session
, nesting
);
3046 ret
= lttng_metadata_printf(session
,
3047 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3051 (parent_encoding
== lttng_kernel_string_encoding_none
)
3053 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3057 #if __BYTE_ORDER == __BIG_ENDIAN
3058 type
->reverse_byte_order
? " byte_order = le;" : ""
3060 type
->reverse_byte_order
? " byte_order = be;" : ""
3067 * Must be called with sessions_mutex held.
3070 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3071 const struct lttng_kernel_type_struct
*type
,
3074 const char *prev_field_name
= NULL
;
3076 uint32_t i
, nr_fields
;
3077 unsigned int alignment
;
3079 ret
= print_tabs(session
, nesting
);
3082 ret
= lttng_metadata_printf(session
,
3086 nr_fields
= type
->nr_fields
;
3087 for (i
= 0; i
< nr_fields
; i
++) {
3088 const struct lttng_kernel_event_field
*iter_field
;
3090 iter_field
= type
->fields
[i
];
3091 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3095 ret
= print_tabs(session
, nesting
);
3098 alignment
= type
->alignment
;
3100 ret
= lttng_metadata_printf(session
,
3104 ret
= lttng_metadata_printf(session
,
3111 * Must be called with sessions_mutex held.
3114 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3115 const struct lttng_kernel_event_field
*field
,
3120 ret
= _lttng_struct_type_statedump(session
,
3121 lttng_kernel_get_type_struct(field
->type
), nesting
);
3124 return lttng_field_name_statedump(session
, field
, nesting
);
3128 * Must be called with sessions_mutex held.
3131 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3132 const struct lttng_kernel_type_variant
*type
,
3134 const char *prev_field_name
)
3136 const char *tag_name
;
3138 uint32_t i
, nr_choices
;
3140 tag_name
= type
->tag_name
;
3142 tag_name
= prev_field_name
;
3146 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3148 if (type
->alignment
!= 0)
3150 ret
= print_tabs(session
, nesting
);
3153 ret
= lttng_metadata_printf(session
,
3154 "variant <_%s> {\n",
3158 nr_choices
= type
->nr_choices
;
3159 for (i
= 0; i
< nr_choices
; i
++) {
3160 const struct lttng_kernel_event_field
*iter_field
;
3162 iter_field
= type
->choices
[i
];
3163 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3167 ret
= print_tabs(session
, nesting
);
3170 ret
= lttng_metadata_printf(session
,
3176 * Must be called with sessions_mutex held.
3179 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3180 const struct lttng_kernel_event_field
*field
,
3182 const char *prev_field_name
)
3186 ret
= _lttng_variant_type_statedump(session
,
3187 lttng_kernel_get_type_variant(field
->type
), nesting
,
3191 return lttng_field_name_statedump(session
, field
, nesting
);
3195 * Must be called with sessions_mutex held.
3198 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3199 const struct lttng_kernel_event_field
*field
,
3203 const struct lttng_kernel_type_array
*array_type
;
3204 const struct lttng_kernel_type_common
*elem_type
;
3206 array_type
= lttng_kernel_get_type_array(field
->type
);
3207 WARN_ON_ONCE(!array_type
);
3209 if (array_type
->alignment
) {
3210 ret
= print_tabs(session
, nesting
);
3213 ret
= lttng_metadata_printf(session
,
3214 "struct { } align(%u) _%s_padding;\n",
3215 array_type
->alignment
* CHAR_BIT
,
3221 * Nested compound types: Only array of structures and variants are
3222 * currently supported.
3224 elem_type
= array_type
->elem_type
;
3225 switch (elem_type
->type
) {
3226 case lttng_kernel_type_integer
:
3227 case lttng_kernel_type_struct
:
3228 case lttng_kernel_type_variant
:
3229 ret
= _lttng_type_statedump(session
, elem_type
,
3230 array_type
->encoding
, nesting
);
3238 ret
= lttng_metadata_printf(session
,
3241 array_type
->length
);
3246 * Must be called with sessions_mutex held.
3249 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3250 const struct lttng_kernel_event_field
*field
,
3252 const char *prev_field_name
)
3255 const char *length_name
;
3256 const struct lttng_kernel_type_sequence
*sequence_type
;
3257 const struct lttng_kernel_type_common
*elem_type
;
3259 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3260 WARN_ON_ONCE(!sequence_type
);
3262 length_name
= sequence_type
->length_name
;
3264 length_name
= prev_field_name
;
3268 if (sequence_type
->alignment
) {
3269 ret
= print_tabs(session
, nesting
);
3272 ret
= lttng_metadata_printf(session
,
3273 "struct { } align(%u) _%s_padding;\n",
3274 sequence_type
->alignment
* CHAR_BIT
,
3281 * Nested compound types: Only array of structures and variants are
3282 * currently supported.
3284 elem_type
= sequence_type
->elem_type
;
3285 switch (elem_type
->type
) {
3286 case lttng_kernel_type_integer
:
3287 case lttng_kernel_type_struct
:
3288 case lttng_kernel_type_variant
:
3289 ret
= _lttng_type_statedump(session
, elem_type
,
3290 sequence_type
->encoding
, nesting
);
3298 ret
= lttng_metadata_printf(session
,
3306 * Must be called with sessions_mutex held.
3309 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3310 const struct lttng_kernel_type_enum
*type
,
3313 const struct lttng_kernel_enum_desc
*enum_desc
;
3314 const struct lttng_kernel_type_common
*container_type
;
3316 unsigned int i
, nr_entries
;
3318 container_type
= type
->container_type
;
3319 if (container_type
->type
!= lttng_kernel_type_integer
) {
3323 enum_desc
= type
->desc
;
3324 nr_entries
= enum_desc
->nr_entries
;
3326 ret
= print_tabs(session
, nesting
);
3329 ret
= lttng_metadata_printf(session
, "enum : ");
3332 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3333 lttng_kernel_string_encoding_none
, 0);
3336 ret
= lttng_metadata_printf(session
, " {\n");
3339 /* Dump all entries */
3340 for (i
= 0; i
< nr_entries
; i
++) {
3341 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3344 ret
= print_tabs(session
, nesting
+ 1);
3347 ret
= lttng_metadata_printf(session
,
3351 len
= strlen(entry
->string
);
3352 /* Escape the character '"' */
3353 for (j
= 0; j
< len
; j
++) {
3354 char c
= entry
->string
[j
];
3358 ret
= lttng_metadata_printf(session
,
3362 ret
= lttng_metadata_printf(session
,
3366 ret
= lttng_metadata_printf(session
,
3373 ret
= lttng_metadata_printf(session
, "\"");
3377 if (entry
->options
.is_auto
) {
3378 ret
= lttng_metadata_printf(session
, ",\n");
3382 ret
= lttng_metadata_printf(session
,
3386 if (entry
->start
.signedness
)
3387 ret
= lttng_metadata_printf(session
,
3388 "%lld", (long long) entry
->start
.value
);
3390 ret
= lttng_metadata_printf(session
,
3391 "%llu", entry
->start
.value
);
3394 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3396 == entry
->end
.value
) {
3397 ret
= lttng_metadata_printf(session
,
3400 if (entry
->end
.signedness
) {
3401 ret
= lttng_metadata_printf(session
,
3403 (long long) entry
->end
.value
);
3405 ret
= lttng_metadata_printf(session
,
3414 ret
= print_tabs(session
, nesting
);
3417 ret
= lttng_metadata_printf(session
, "}");
3423 * Must be called with sessions_mutex held.
3426 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3427 const struct lttng_kernel_event_field
*field
,
3431 const struct lttng_kernel_type_enum
*enum_type
;
3433 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3434 WARN_ON_ONCE(!enum_type
);
3435 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3438 return lttng_field_name_statedump(session
, field
, nesting
);
3442 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3443 const struct lttng_kernel_event_field
*field
,
3448 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3449 lttng_kernel_string_encoding_none
, nesting
);
3452 return lttng_field_name_statedump(session
, field
, nesting
);
3456 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3457 const struct lttng_kernel_type_string
*type
,
3462 /* Default encoding is UTF8 */
3463 ret
= print_tabs(session
, nesting
);
3466 ret
= lttng_metadata_printf(session
,
3468 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3469 " { encoding = ASCII; }" : "");
3474 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3475 const struct lttng_kernel_event_field
*field
,
3478 const struct lttng_kernel_type_string
*string_type
;
3481 string_type
= lttng_kernel_get_type_string(field
->type
);
3482 WARN_ON_ONCE(!string_type
);
3483 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3486 return lttng_field_name_statedump(session
, field
, nesting
);
3490 * Must be called with sessions_mutex held.
3493 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3494 const struct lttng_kernel_type_common
*type
,
3495 enum lttng_kernel_string_encoding parent_encoding
,
3500 switch (type
->type
) {
3501 case lttng_kernel_type_integer
:
3502 ret
= _lttng_integer_type_statedump(session
,
3503 lttng_kernel_get_type_integer(type
),
3504 parent_encoding
, nesting
);
3506 case lttng_kernel_type_enum
:
3507 ret
= _lttng_enum_type_statedump(session
,
3508 lttng_kernel_get_type_enum(type
),
3511 case lttng_kernel_type_string
:
3512 ret
= _lttng_string_type_statedump(session
,
3513 lttng_kernel_get_type_string(type
),
3516 case lttng_kernel_type_struct
:
3517 ret
= _lttng_struct_type_statedump(session
,
3518 lttng_kernel_get_type_struct(type
),
3521 case lttng_kernel_type_variant
:
3522 ret
= _lttng_variant_type_statedump(session
,
3523 lttng_kernel_get_type_variant(type
),
3527 /* Nested arrays and sequences are not supported yet. */
3528 case lttng_kernel_type_array
:
3529 case lttng_kernel_type_sequence
:
3538 * Must be called with sessions_mutex held.
3541 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3542 const struct lttng_kernel_event_field
*field
,
3544 const char **prev_field_name_p
)
3546 const char *prev_field_name
= NULL
;
3549 if (prev_field_name_p
)
3550 prev_field_name
= *prev_field_name_p
;
3551 switch (field
->type
->type
) {
3552 case lttng_kernel_type_integer
:
3553 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3555 case lttng_kernel_type_enum
:
3556 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3558 case lttng_kernel_type_string
:
3559 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3561 case lttng_kernel_type_struct
:
3562 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3564 case lttng_kernel_type_array
:
3565 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3567 case lttng_kernel_type_sequence
:
3568 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3570 case lttng_kernel_type_variant
:
3571 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3578 if (prev_field_name_p
)
3579 *prev_field_name_p
= field
->name
;
3584 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3585 struct lttng_kernel_ctx
*ctx
)
3587 const char *prev_field_name
= NULL
;
3593 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3594 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3596 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3604 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3605 struct lttng_kernel_event_recorder
*event_recorder
)
3607 const char *prev_field_name
= NULL
;
3608 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3612 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3613 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3615 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3623 * Must be called with sessions_mutex held.
3624 * The entire event metadata is printed as a single atomic metadata
3628 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3629 struct lttng_kernel_channel_buffer
*chan
,
3630 struct lttng_kernel_event_recorder
*event_recorder
)
3634 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3636 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3639 lttng_metadata_begin(session
);
3641 ret
= lttng_metadata_printf(session
,
3645 " stream_id = %u;\n",
3646 event_recorder
->priv
->parent
.desc
->event_name
,
3647 event_recorder
->priv
->id
,
3648 event_recorder
->chan
->priv
->id
);
3652 ret
= lttng_metadata_printf(session
,
3653 " fields := struct {\n"
3658 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3663 * LTTng space reservation can only reserve multiples of the
3666 ret
= lttng_metadata_printf(session
,
3672 event_recorder
->priv
->metadata_dumped
= 1;
3674 lttng_metadata_end(session
);
3680 * Must be called with sessions_mutex held.
3681 * The entire channel metadata is printed as a single atomic metadata
3685 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3686 struct lttng_kernel_channel_buffer
*chan
)
3690 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3693 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3696 lttng_metadata_begin(session
);
3698 WARN_ON_ONCE(!chan
->priv
->header_type
);
3699 ret
= lttng_metadata_printf(session
,
3702 " event.header := %s;\n"
3703 " packet.context := struct packet_context;\n",
3705 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3706 "struct event_header_large");
3710 if (chan
->priv
->ctx
) {
3711 ret
= lttng_metadata_printf(session
,
3712 " event.context := struct {\n");
3716 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3719 if (chan
->priv
->ctx
) {
3720 ret
= lttng_metadata_printf(session
,
3726 ret
= lttng_metadata_printf(session
,
3729 chan
->priv
->metadata_dumped
= 1;
3731 lttng_metadata_end(session
);
3736 * Must be called with sessions_mutex held.
3739 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3741 return lttng_metadata_printf(session
,
3742 "struct packet_context {\n"
3743 " uint64_clock_monotonic_t timestamp_begin;\n"
3744 " uint64_clock_monotonic_t timestamp_end;\n"
3745 " uint64_t content_size;\n"
3746 " uint64_t packet_size;\n"
3747 " uint64_t packet_seq_num;\n"
3748 " unsigned long events_discarded;\n"
3749 " uint32_t cpu_id;\n"
3756 * id: range: 0 - 30.
3757 * id 31 is reserved to indicate an extended header.
3760 * id: range: 0 - 65534.
3761 * id 65535 is reserved to indicate an extended header.
3763 * Must be called with sessions_mutex held.
3766 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3768 return lttng_metadata_printf(session
,
3769 "struct event_header_compact {\n"
3770 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3773 " uint27_clock_monotonic_t timestamp;\n"
3777 " uint64_clock_monotonic_t timestamp;\n"
3782 "struct event_header_large {\n"
3783 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3786 " uint32_clock_monotonic_t timestamp;\n"
3790 " uint64_clock_monotonic_t timestamp;\n"
3794 lttng_alignof(uint32_t) * CHAR_BIT
,
3795 lttng_alignof(uint16_t) * CHAR_BIT
3800 * Approximation of NTP time of day to clock monotonic correlation,
3801 * taken at start of trace.
3802 * Yes, this is only an approximation. Yes, we can (and will) do better
3803 * in future versions.
3804 * This function may return a negative offset. It may happen if the
3805 * system sets the REALTIME clock to 0 after boot.
3807 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3811 int64_t measure_clock_offset(void)
3813 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3814 uint64_t tcf
= trace_clock_freq();
3816 unsigned long flags
;
3817 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3818 struct timespec64 rts
= { 0, 0 };
3820 struct timespec rts
= { 0, 0 };
3823 /* Disable interrupts to increase correlation precision. */
3824 local_irq_save(flags
);
3825 monotonic
[0] = trace_clock_read64();
3826 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3827 ktime_get_real_ts64(&rts
);
3829 getnstimeofday(&rts
);
3831 monotonic
[1] = trace_clock_read64();
3832 local_irq_restore(flags
);
3834 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3835 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3836 if (tcf
== NSEC_PER_SEC
) {
3837 realtime
+= rts
.tv_nsec
;
3839 uint64_t n
= rts
.tv_nsec
* tcf
;
3841 do_div(n
, NSEC_PER_SEC
);
3844 offset
= (int64_t) realtime
- monotonic_avg
;
3849 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3857 while (cur
!= '\0') {
3860 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3864 ret
= lttng_metadata_printf(session
, "%c", '\\');
3867 /* We still print the current char */
3870 ret
= lttng_metadata_printf(session
, "%c", cur
);
3884 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3885 const char *field_value
)
3889 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3893 ret
= print_escaped_ctf_string(session
, field_value
);
3897 ret
= lttng_metadata_printf(session
, "\";\n");
3904 * Output metadata into this session's metadata buffers.
3905 * Must be called with sessions_mutex held.
3908 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3910 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3911 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3912 const char *product_uuid
;
3913 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3914 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3917 if (!LTTNG_READ_ONCE(session
->active
))
3920 lttng_metadata_begin(session
);
3922 if (session
->priv
->metadata_dumped
)
3925 snprintf(uuid_s
, sizeof(uuid_s
),
3926 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3927 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3928 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3929 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3930 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3932 ret
= lttng_metadata_printf(session
,
3933 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3934 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3935 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3936 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3937 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3938 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3939 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3945 " byte_order = %s;\n"
3946 " packet.header := struct {\n"
3947 " uint32_t magic;\n"
3948 " uint8_t uuid[16];\n"
3949 " uint32_t stream_id;\n"
3950 " uint64_t stream_instance_id;\n"
3953 lttng_alignof(uint8_t) * CHAR_BIT
,
3954 lttng_alignof(uint16_t) * CHAR_BIT
,
3955 lttng_alignof(uint32_t) * CHAR_BIT
,
3956 lttng_alignof(uint64_t) * CHAR_BIT
,
3957 sizeof(unsigned long) * CHAR_BIT
,
3958 lttng_alignof(unsigned long) * CHAR_BIT
,
3962 #if __BYTE_ORDER == __BIG_ENDIAN
3971 ret
= lttng_metadata_printf(session
,
3973 " hostname = \"%s\";\n"
3974 " domain = \"kernel\";\n"
3975 " sysname = \"%s\";\n"
3976 " kernel_release = \"%s\";\n"
3977 " kernel_version = \"%s\";\n"
3978 " tracer_name = \"lttng-modules\";\n"
3979 " tracer_major = %d;\n"
3980 " tracer_minor = %d;\n"
3981 " tracer_patchlevel = %d;\n"
3982 " trace_buffering_scheme = \"global\";\n",
3983 current
->nsproxy
->uts_ns
->name
.nodename
,
3987 LTTNG_MODULES_MAJOR_VERSION
,
3988 LTTNG_MODULES_MINOR_VERSION
,
3989 LTTNG_MODULES_PATCHLEVEL_VERSION
3994 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3997 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3998 session
->priv
->creation_time
);
4002 /* Add the product UUID to the 'env' section */
4003 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4005 ret
= lttng_metadata_printf(session
,
4006 " product_uuid = \"%s\";\n",
4013 /* Close the 'env' section */
4014 ret
= lttng_metadata_printf(session
, "};\n\n");
4018 ret
= lttng_metadata_printf(session
,
4020 " name = \"%s\";\n",
4026 if (!trace_clock_uuid(clock_uuid_s
)) {
4027 ret
= lttng_metadata_printf(session
,
4028 " uuid = \"%s\";\n",
4035 ret
= lttng_metadata_printf(session
,
4036 " description = \"%s\";\n"
4037 " freq = %llu; /* Frequency, in Hz */\n"
4038 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4041 trace_clock_description(),
4042 (unsigned long long) trace_clock_freq(),
4043 (long long) measure_clock_offset()
4048 ret
= lttng_metadata_printf(session
,
4049 "typealias integer {\n"
4050 " size = 27; align = 1; signed = false;\n"
4051 " map = clock.%s.value;\n"
4052 "} := uint27_clock_monotonic_t;\n"
4054 "typealias integer {\n"
4055 " size = 32; align = %u; signed = false;\n"
4056 " map = clock.%s.value;\n"
4057 "} := uint32_clock_monotonic_t;\n"
4059 "typealias integer {\n"
4060 " size = 64; align = %u; signed = false;\n"
4061 " map = clock.%s.value;\n"
4062 "} := uint64_clock_monotonic_t;\n\n",
4064 lttng_alignof(uint32_t) * CHAR_BIT
,
4066 lttng_alignof(uint64_t) * CHAR_BIT
,
4072 ret
= _lttng_stream_packet_context_declare(session
);
4076 ret
= _lttng_event_header_declare(session
);
4081 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4082 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4087 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, node
) {
4088 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4089 event_recorder_priv
->pub
);
4093 session
->priv
->metadata_dumped
= 1;
4095 lttng_metadata_end(session
);
4100 * lttng_transport_register - LTT transport registration
4101 * @transport: transport structure
4103 * Registers a transport which can be used as output to extract the data out of
4104 * LTTng. The module calling this registration function must ensure that no
4105 * trap-inducing code will be executed by the transport functions. E.g.
4106 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4107 * is made visible to the transport function. This registration acts as a
4108 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4109 * after its registration must it synchronize the TLBs.
4111 void lttng_transport_register(struct lttng_transport
*transport
)
4114 * Make sure no page fault can be triggered by the module about to be
4115 * registered. We deal with this here so we don't have to call
4116 * vmalloc_sync_mappings() in each module's init.
4118 wrapper_vmalloc_sync_mappings();
4120 mutex_lock(&sessions_mutex
);
4121 list_add_tail(&transport
->node
, <tng_transport_list
);
4122 mutex_unlock(&sessions_mutex
);
4124 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4127 * lttng_transport_unregister - LTT transport unregistration
4128 * @transport: transport structure
4130 void lttng_transport_unregister(struct lttng_transport
*transport
)
4132 mutex_lock(&sessions_mutex
);
4133 list_del(&transport
->node
);
4134 mutex_unlock(&sessions_mutex
);
4136 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4138 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4141 * Make sure no page fault can be triggered by the module about to be
4142 * registered. We deal with this here so we don't have to call
4143 * vmalloc_sync_mappings() in each module's init.
4145 wrapper_vmalloc_sync_mappings();
4147 mutex_lock(&sessions_mutex
);
4148 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4149 mutex_unlock(&sessions_mutex
);
4151 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4153 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4155 mutex_lock(&sessions_mutex
);
4156 list_del(&transport
->node
);
4157 mutex_unlock(&sessions_mutex
);
4159 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4161 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4163 enum cpuhp_state lttng_hp_prepare
;
4164 enum cpuhp_state lttng_hp_online
;
4166 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4168 struct lttng_cpuhp_node
*lttng_node
;
4170 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4171 switch (lttng_node
->component
) {
4172 case LTTNG_RING_BUFFER_FRONTEND
:
4174 case LTTNG_RING_BUFFER_BACKEND
:
4175 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4176 case LTTNG_RING_BUFFER_ITER
:
4178 case LTTNG_CONTEXT_PERF_COUNTERS
:
4185 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4187 struct lttng_cpuhp_node
*lttng_node
;
4189 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4190 switch (lttng_node
->component
) {
4191 case LTTNG_RING_BUFFER_FRONTEND
:
4192 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4193 case LTTNG_RING_BUFFER_BACKEND
:
4195 case LTTNG_RING_BUFFER_ITER
:
4197 case LTTNG_CONTEXT_PERF_COUNTERS
:
4198 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4204 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4206 struct lttng_cpuhp_node
*lttng_node
;
4208 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4209 switch (lttng_node
->component
) {
4210 case LTTNG_RING_BUFFER_FRONTEND
:
4211 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4212 case LTTNG_RING_BUFFER_BACKEND
:
4214 case LTTNG_RING_BUFFER_ITER
:
4215 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4216 case LTTNG_CONTEXT_PERF_COUNTERS
:
4217 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4223 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4225 struct lttng_cpuhp_node
*lttng_node
;
4227 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4228 switch (lttng_node
->component
) {
4229 case LTTNG_RING_BUFFER_FRONTEND
:
4230 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4231 case LTTNG_RING_BUFFER_BACKEND
:
4233 case LTTNG_RING_BUFFER_ITER
:
4235 case LTTNG_CONTEXT_PERF_COUNTERS
:
4242 static int __init
lttng_init_cpu_hotplug(void)
4246 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4247 lttng_hotplug_prepare
,
4248 lttng_hotplug_dead
);
4252 lttng_hp_prepare
= ret
;
4253 lttng_rb_set_hp_prepare(ret
);
4255 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4256 lttng_hotplug_online
,
4257 lttng_hotplug_offline
);
4259 cpuhp_remove_multi_state(lttng_hp_prepare
);
4260 lttng_hp_prepare
= 0;
4263 lttng_hp_online
= ret
;
4264 lttng_rb_set_hp_online(ret
);
4269 static void __exit
lttng_exit_cpu_hotplug(void)
4271 lttng_rb_set_hp_online(0);
4272 cpuhp_remove_multi_state(lttng_hp_online
);
4273 lttng_rb_set_hp_prepare(0);
4274 cpuhp_remove_multi_state(lttng_hp_prepare
);
4277 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4278 static int lttng_init_cpu_hotplug(void)
4282 static void lttng_exit_cpu_hotplug(void)
4285 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4287 static int __init
lttng_events_init(void)
4291 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4294 ret
= wrapper_get_pfnblock_flags_mask_init();
4297 ret
= wrapper_get_pageblock_flags_mask_init();
4300 ret
= lttng_probes_init();
4303 ret
= lttng_context_init();
4306 ret
= lttng_tracepoint_init();
4309 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4310 if (!event_recorder_cache
) {
4312 goto error_kmem_event_recorder
;
4314 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4315 if (!event_recorder_private_cache
) {
4317 goto error_kmem_event_recorder_private
;
4319 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4320 if (!event_notifier_cache
) {
4322 goto error_kmem_event_notifier
;
4324 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4325 if (!event_notifier_private_cache
) {
4327 goto error_kmem_event_notifier_private
;
4329 ret
= lttng_abi_init();
4332 ret
= lttng_logger_init();
4335 ret
= lttng_init_cpu_hotplug();
4338 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4339 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4340 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4341 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4342 LTTNG_MODULES_EXTRAVERSION
,
4344 #ifdef LTTNG_EXTRA_VERSION_GIT
4345 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4349 #ifdef LTTNG_EXTRA_VERSION_NAME
4350 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4354 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4355 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4356 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4360 lttng_logger_exit();
4364 kmem_cache_destroy(event_notifier_private_cache
);
4365 error_kmem_event_notifier_private
:
4366 kmem_cache_destroy(event_notifier_cache
);
4367 error_kmem_event_notifier
:
4368 kmem_cache_destroy(event_recorder_private_cache
);
4369 error_kmem_event_recorder_private
:
4370 kmem_cache_destroy(event_recorder_cache
);
4371 error_kmem_event_recorder
:
4372 lttng_tracepoint_exit();
4374 lttng_context_exit();
4375 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4376 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4377 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4378 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4379 LTTNG_MODULES_EXTRAVERSION
,
4381 #ifdef LTTNG_EXTRA_VERSION_GIT
4382 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4386 #ifdef LTTNG_EXTRA_VERSION_NAME
4387 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4394 module_init(lttng_events_init
);
4396 static void __exit
lttng_events_exit(void)
4398 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4400 lttng_exit_cpu_hotplug();
4401 lttng_logger_exit();
4403 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4404 lttng_session_destroy(session_priv
->pub
);
4405 kmem_cache_destroy(event_recorder_cache
);
4406 kmem_cache_destroy(event_recorder_private_cache
);
4407 kmem_cache_destroy(event_notifier_cache
);
4408 kmem_cache_destroy(event_notifier_private_cache
);
4409 lttng_tracepoint_exit();
4410 lttng_context_exit();
4411 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4412 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4413 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4414 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4415 LTTNG_MODULES_EXTRAVERSION
,
4417 #ifdef LTTNG_EXTRA_VERSION_GIT
4418 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4422 #ifdef LTTNG_EXTRA_VERSION_NAME
4423 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4429 module_exit(lttng_events_exit
);
4431 #include <generated/patches.h>
4432 #ifdef LTTNG_EXTRA_VERSION_GIT
4433 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4435 #ifdef LTTNG_EXTRA_VERSION_NAME
4436 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4438 MODULE_LICENSE("GPL and additional rights");
4439 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4440 MODULE_DESCRIPTION("LTTng tracer");
4441 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4442 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4443 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4444 LTTNG_MODULES_EXTRAVERSION
);