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_enabler_common
*event_enabler
, *tmp_event_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
, parent
.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_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
375 lttng_event_enabler_destroy(event_enabler
);
376 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
377 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
378 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
379 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
380 _lttng_channel_destroy(chan_priv
->pub
);
382 mutex_lock(&session
->priv
->metadata_cache
->lock
);
383 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
384 _lttng_metadata_channel_hangup(metadata_stream
);
385 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
386 lttng_id_tracker_fini(&session
->pid_tracker
);
387 lttng_id_tracker_fini(&session
->vpid_tracker
);
388 lttng_id_tracker_fini(&session
->uid_tracker
);
389 lttng_id_tracker_fini(&session
->vuid_tracker
);
390 lttng_id_tracker_fini(&session
->gid_tracker
);
391 lttng_id_tracker_fini(&session
->vgid_tracker
);
392 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
393 list_del(&session
->priv
->list
);
394 mutex_unlock(&sessions_mutex
);
395 lttng_kvfree(session
->priv
);
396 lttng_kvfree(session
);
399 void lttng_event_notifier_group_destroy(
400 struct lttng_event_notifier_group
*event_notifier_group
)
402 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
403 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
406 if (!event_notifier_group
)
409 mutex_lock(&sessions_mutex
);
411 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
414 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
415 &event_notifier_group
->event_notifiers_head
, parent
.node
) {
416 ret
= _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
420 /* Wait for in-flight event notifier to complete */
423 irq_work_sync(&event_notifier_group
->wakeup_pending
);
425 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
428 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
429 &event_notifier_group
->enablers_head
, node
)
430 lttng_event_enabler_destroy(event_enabler
);
432 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
433 &event_notifier_group
->event_notifiers_head
, parent
.node
)
434 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
436 if (event_notifier_group
->error_counter
) {
437 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
439 error_counter
->ops
->counter_destroy(error_counter
->counter
);
440 module_put(error_counter
->transport
->owner
);
441 lttng_kvfree(error_counter
);
442 event_notifier_group
->error_counter
= NULL
;
445 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
446 module_put(event_notifier_group
->transport
->owner
);
447 list_del(&event_notifier_group
->node
);
449 mutex_unlock(&sessions_mutex
);
450 lttng_kvfree(event_notifier_group
);
453 int lttng_session_statedump(struct lttng_kernel_session
*session
)
457 mutex_lock(&sessions_mutex
);
458 ret
= lttng_statedump_start(session
);
459 mutex_unlock(&sessions_mutex
);
463 int lttng_session_enable(struct lttng_kernel_session
*session
)
466 struct lttng_kernel_channel_buffer_private
*chan_priv
;
468 mutex_lock(&sessions_mutex
);
469 if (session
->active
) {
474 /* Set transient enabler state to "enabled" */
475 session
->priv
->tstate
= 1;
477 /* We need to sync enablers with session before activation. */
478 lttng_session_sync_event_enablers(session
);
481 * Snapshot the number of events per channel to know the type of header
484 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
485 if (chan_priv
->header_type
)
486 continue; /* don't change it if session stop/restart */
487 if (chan_priv
->free_event_id
< 31)
488 chan_priv
->header_type
= 1; /* compact */
490 chan_priv
->header_type
= 2; /* large */
493 /* Clear each stream's quiescent state. */
494 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
495 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
496 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
499 WRITE_ONCE(session
->active
, 1);
500 WRITE_ONCE(session
->priv
->been_active
, 1);
501 ret
= _lttng_session_metadata_statedump(session
);
503 WRITE_ONCE(session
->active
, 0);
506 ret
= lttng_statedump_start(session
);
508 WRITE_ONCE(session
->active
, 0);
510 mutex_unlock(&sessions_mutex
);
514 int lttng_session_disable(struct lttng_kernel_session
*session
)
517 struct lttng_kernel_channel_buffer_private
*chan_priv
;
519 mutex_lock(&sessions_mutex
);
520 if (!session
->active
) {
524 WRITE_ONCE(session
->active
, 0);
526 /* Set transient enabler state to "disabled" */
527 session
->priv
->tstate
= 0;
528 lttng_session_sync_event_enablers(session
);
530 /* Set each stream's quiescent state. */
531 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
532 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
533 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
536 mutex_unlock(&sessions_mutex
);
540 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
543 struct lttng_kernel_channel_buffer_private
*chan_priv
;
544 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
545 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
546 struct lttng_metadata_stream
*stream
;
548 mutex_lock(&sessions_mutex
);
549 if (!session
->active
) {
554 mutex_lock(&cache
->lock
);
555 memset(cache
->data
, 0, cache
->cache_alloc
);
556 cache
->metadata_written
= 0;
558 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
559 stream
->metadata_out
= 0;
560 stream
->metadata_in
= 0;
562 mutex_unlock(&cache
->lock
);
564 session
->priv
->metadata_dumped
= 0;
565 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
566 chan_priv
->metadata_dumped
= 0;
569 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
570 event_recorder_priv
->metadata_dumped
= 0;
573 ret
= _lttng_session_metadata_statedump(session
);
576 mutex_unlock(&sessions_mutex
);
581 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
583 struct lttng_kernel_channel_buffer
*chan_buf
;
585 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
587 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
588 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
593 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
597 mutex_lock(&sessions_mutex
);
598 if (is_channel_buffer_metadata(channel
)) {
602 if (channel
->enabled
) {
606 /* Set transient enabler state to "enabled" */
607 channel
->priv
->tstate
= 1;
608 lttng_session_sync_event_enablers(channel
->session
);
609 /* Set atomically the state to "enabled" */
610 WRITE_ONCE(channel
->enabled
, 1);
612 mutex_unlock(&sessions_mutex
);
616 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
620 mutex_lock(&sessions_mutex
);
621 if (is_channel_buffer_metadata(channel
)) {
625 if (!channel
->enabled
) {
629 /* Set atomically the state to "disabled" */
630 WRITE_ONCE(channel
->enabled
, 0);
631 /* Set transient enabler state to "enabled" */
632 channel
->priv
->tstate
= 0;
633 lttng_session_sync_event_enablers(channel
->session
);
635 mutex_unlock(&sessions_mutex
);
639 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
643 mutex_lock(&sessions_mutex
);
644 switch (event
->type
) {
645 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
647 struct lttng_kernel_event_recorder
*event_recorder
=
648 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
650 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
656 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
657 switch (event
->priv
->instrumentation
) {
658 case LTTNG_KERNEL_ABI_KRETPROBE
:
669 if (event
->enabled
) {
673 switch (event
->priv
->instrumentation
) {
674 case LTTNG_KERNEL_ABI_TRACEPOINT
:
676 case LTTNG_KERNEL_ABI_SYSCALL
:
680 case LTTNG_KERNEL_ABI_KPROBE
:
682 case LTTNG_KERNEL_ABI_UPROBE
:
683 WRITE_ONCE(event
->enabled
, 1);
686 case LTTNG_KERNEL_ABI_KRETPROBE
:
687 ret
= lttng_kretprobes_event_enable_state(event
, 1);
690 case LTTNG_KERNEL_ABI_FUNCTION
:
692 case LTTNG_KERNEL_ABI_NOOP
:
699 mutex_unlock(&sessions_mutex
);
703 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
707 mutex_lock(&sessions_mutex
);
708 switch (event
->type
) {
709 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
711 struct lttng_kernel_event_recorder
*event_recorder
=
712 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
714 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
720 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
721 switch (event
->priv
->instrumentation
) {
722 case LTTNG_KERNEL_ABI_KRETPROBE
:
733 if (!event
->enabled
) {
737 switch (event
->priv
->instrumentation
) {
738 case LTTNG_KERNEL_ABI_TRACEPOINT
:
740 case LTTNG_KERNEL_ABI_SYSCALL
:
744 case LTTNG_KERNEL_ABI_KPROBE
:
746 case LTTNG_KERNEL_ABI_UPROBE
:
747 WRITE_ONCE(event
->enabled
, 0);
750 case LTTNG_KERNEL_ABI_KRETPROBE
:
751 ret
= lttng_kretprobes_event_enable_state(event
, 0);
754 case LTTNG_KERNEL_ABI_FUNCTION
:
756 case LTTNG_KERNEL_ABI_NOOP
:
763 mutex_unlock(&sessions_mutex
);
767 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
768 const char *transport_name
,
770 size_t subbuf_size
, size_t num_subbuf
,
771 unsigned int switch_timer_interval
,
772 unsigned int read_timer_interval
,
773 enum channel_type channel_type
)
775 struct lttng_kernel_channel_buffer
*chan
;
776 struct lttng_kernel_channel_buffer_private
*chan_priv
;
777 struct lttng_transport
*transport
= NULL
;
779 mutex_lock(&sessions_mutex
);
780 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
781 goto active
; /* Refuse to add channel to active session */
782 transport
= lttng_transport_find(transport_name
);
784 printk(KERN_WARNING
"LTTng: transport %s not found\n",
788 if (!try_module_get(transport
->owner
)) {
789 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
792 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
795 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
798 chan
->priv
= chan_priv
;
799 chan_priv
->pub
= chan
;
800 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
801 chan
->parent
.session
= session
;
802 chan
->priv
->id
= session
->priv
->free_chan_id
++;
803 chan
->ops
= &transport
->ops
;
805 * Note: the channel creation op already writes into the packet
806 * headers. Therefore the "chan" information used as input
807 * should be already accessible.
809 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
810 chan
, buf_addr
, subbuf_size
, num_subbuf
,
811 switch_timer_interval
, read_timer_interval
);
812 if (!chan
->priv
->rb_chan
)
814 chan
->priv
->parent
.tstate
= 1;
815 chan
->parent
.enabled
= 1;
816 chan
->priv
->transport
= transport
;
817 chan
->priv
->channel_type
= channel_type
;
818 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
819 mutex_unlock(&sessions_mutex
);
828 module_put(transport
->owner
);
831 mutex_unlock(&sessions_mutex
);
836 * Only used internally at session destruction for per-cpu channels, and
837 * when metadata channel is released.
838 * Needs to be called with sessions mutex held.
841 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
843 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
844 module_put(chan
->priv
->transport
->owner
);
845 list_del(&chan
->priv
->node
);
846 lttng_kernel_destroy_context(chan
->priv
->ctx
);
851 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
853 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
855 /* Protect the metadata cache with the sessions_mutex. */
856 mutex_lock(&sessions_mutex
);
857 _lttng_channel_destroy(chan
);
858 mutex_unlock(&sessions_mutex
);
860 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
863 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
865 stream
->finalized
= 1;
866 wake_up_interruptible(&stream
->read_wait
);
870 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
872 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
873 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
875 switch (event_enabler
->enabler_type
) {
876 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
878 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
879 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
880 struct lttng_kernel_event_recorder
*event_recorder
;
881 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
882 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
884 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
887 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
888 if (!event_recorder_priv
) {
889 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
892 event_recorder_priv
->pub
= event_recorder
;
893 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
894 event_recorder
->priv
= event_recorder_priv
;
895 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
897 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
898 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
899 event_recorder
->priv
->parent
.instrumentation
= itype
;
900 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
901 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
903 event_recorder
->chan
= chan
;
904 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
905 return &event_recorder
->parent
;
907 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
909 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
910 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
911 struct lttng_kernel_event_notifier
*event_notifier
;
912 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
914 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
917 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
918 if (!event_notifier_priv
) {
919 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
922 event_notifier_priv
->pub
= event_notifier
;
923 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
924 event_notifier
->priv
= event_notifier_priv
;
925 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
927 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
928 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
929 event_notifier
->priv
->parent
.instrumentation
= itype
;
930 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
931 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
932 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
934 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
935 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
936 event_notifier
->priv
->num_captures
= 0;
937 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
938 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
939 return &event_notifier
->parent
;
947 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
949 switch (event
->type
) {
950 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
952 struct lttng_kernel_event_recorder
*event_recorder
=
953 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
955 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
956 kmem_cache_free(event_recorder_cache
, event_recorder
);
959 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
961 struct lttng_kernel_event_notifier
*event_notifier
=
962 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
964 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
965 kmem_cache_free(event_notifier_cache
, event_notifier
);
974 * Supports event creation while tracing session is active.
975 * Needs to be called with sessions mutex held.
978 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
979 const struct lttng_kernel_event_desc
*event_desc
)
981 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
982 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
983 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
984 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
985 struct lttng_kernel_event_common_private
*event_priv
;
986 struct lttng_kernel_event_common
*event
;
987 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
988 struct lttng_kernel_event_recorder
*event_recorder
;
989 const char *event_name
;
990 struct hlist_head
*head
;
993 if (chan
->priv
->free_event_id
== -1U) {
999 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1000 event_name
= event_desc
->event_name
;
1003 case LTTNG_KERNEL_ABI_KPROBE
:
1005 case LTTNG_KERNEL_ABI_UPROBE
:
1007 case LTTNG_KERNEL_ABI_KRETPROBE
:
1009 case LTTNG_KERNEL_ABI_SYSCALL
:
1010 event_name
= event_param
->name
;
1013 case LTTNG_KERNEL_ABI_FUNCTION
:
1015 case LTTNG_KERNEL_ABI_NOOP
:
1023 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1024 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1025 event_recorder_priv
= container_of(event_priv
, struct lttng_kernel_event_recorder_private
, parent
);
1027 WARN_ON_ONCE(!event_priv
->desc
);
1028 if (!strncmp(event_priv
->desc
->event_name
, event_name
,
1029 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1030 && chan
== event_recorder_priv
->pub
->chan
) {
1036 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1041 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1044 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1045 /* Event will be enabled by enabler sync. */
1047 event
->priv
->registered
= 0;
1048 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1049 if (!event
->priv
->desc
) {
1051 goto register_error
;
1053 /* Populate lttng_event structure before event registration. */
1057 case LTTNG_KERNEL_ABI_KPROBE
:
1059 * Needs to be explicitly enabled after creation, since
1060 * we may want to apply filters.
1063 event
->priv
->registered
= 1;
1065 * Populate lttng_event structure before event
1069 ret
= lttng_kprobes_register_event(event_name
,
1070 event_param
->u
.kprobe
.symbol_name
,
1071 event_param
->u
.kprobe
.offset
,
1072 event_param
->u
.kprobe
.addr
,
1076 goto register_error
;
1078 ret
= try_module_get(event
->priv
->desc
->owner
);
1082 case LTTNG_KERNEL_ABI_KRETPROBE
:
1084 struct lttng_kernel_event_common
*event_return
;
1085 struct lttng_kernel_event_recorder
*event_recorder_return
;
1087 /* kretprobe defines 2 events */
1089 * Needs to be explicitly enabled after creation, since
1090 * we may want to apply filters.
1093 event
->priv
->registered
= 1;
1095 event_return
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1100 event_recorder_return
= container_of(event_return
, struct lttng_kernel_event_recorder
, parent
);
1102 event_return
->enabled
= 0;
1103 event_return
->priv
->registered
= 1;
1106 * Populate lttng_event structure before kretprobe registration.
1109 ret
= lttng_kretprobes_register(event_name
,
1110 event_param
->u
.kretprobe
.symbol_name
,
1111 event_param
->u
.kretprobe
.offset
,
1112 event_param
->u
.kretprobe
.addr
,
1113 event
, event_return
);
1115 lttng_kernel_event_free(event_return
);
1117 goto register_error
;
1119 /* Take 2 refs on the module: one per event. */
1120 ret
= try_module_get(event
->priv
->desc
->owner
);
1122 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1124 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder_return
);
1125 WARN_ON_ONCE(ret
> 0);
1127 lttng_kernel_event_free(event_return
);
1128 module_put(event_return
->priv
->desc
->owner
);
1129 module_put(event
->priv
->desc
->owner
);
1130 goto statedump_error
;
1132 list_add(&event_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1136 case LTTNG_KERNEL_ABI_SYSCALL
:
1138 * Needs to be explicitly enabled after creation, since
1139 * we may want to apply filters.
1142 event
->priv
->registered
= 0;
1143 event
->priv
->desc
= event_desc
;
1144 switch (event_param
->u
.syscall
.entryexit
) {
1145 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1147 goto register_error
;
1148 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1149 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1151 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1152 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1155 switch (event_param
->u
.syscall
.abi
) {
1156 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1158 goto register_error
;
1159 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1160 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1162 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1163 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1166 if (!event
->priv
->desc
) {
1168 goto register_error
;
1172 case LTTNG_KERNEL_ABI_UPROBE
:
1174 * Needs to be explicitly enabled after creation, since
1175 * we may want to apply filters.
1178 event
->priv
->registered
= 1;
1181 * Populate lttng_event structure before event
1186 ret
= lttng_uprobes_register_event(event_param
->name
,
1187 event_param
->u
.uprobe
.fd
,
1190 goto register_error
;
1191 ret
= try_module_get(event
->priv
->desc
->owner
);
1195 case LTTNG_KERNEL_ABI_FUNCTION
:
1197 case LTTNG_KERNEL_ABI_NOOP
:
1202 goto register_error
;
1204 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1205 WARN_ON_ONCE(ret
> 0);
1207 goto statedump_error
;
1209 hlist_add_head(&event
->priv
->hlist_node
, head
);
1210 list_add(&event
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1211 return event_recorder
;
1214 /* If a statedump error occurs, events will not be readable. */
1216 lttng_kernel_event_free(event
);
1221 return ERR_PTR(ret
);
1225 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1226 const struct lttng_kernel_event_desc
*event_desc
)
1228 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1229 struct lttng_event_notifier_group
*event_notifier_group
= event_enabler
->group
;
1230 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1231 uint64_t token
= event_enabler
->parent
.user_token
;
1232 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1233 struct lttng_kernel_event_common_private
*event_priv
;
1234 struct lttng_kernel_event_common
*event
;
1235 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1236 struct lttng_kernel_event_notifier
*event_notifier
;
1237 struct lttng_counter
*error_counter
;
1238 const char *event_name
;
1239 struct hlist_head
*head
;
1243 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1244 event_name
= event_desc
->event_name
;
1247 case LTTNG_KERNEL_ABI_KPROBE
:
1249 case LTTNG_KERNEL_ABI_UPROBE
:
1251 case LTTNG_KERNEL_ABI_SYSCALL
:
1252 event_name
= event_param
->name
;
1255 case LTTNG_KERNEL_ABI_KRETPROBE
:
1257 case LTTNG_KERNEL_ABI_FUNCTION
:
1259 case LTTNG_KERNEL_ABI_NOOP
:
1267 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1268 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1269 event_notifier_priv
= container_of(event_priv
, struct lttng_kernel_event_notifier_private
, parent
);
1271 WARN_ON_ONCE(!event_priv
->desc
);
1272 if (!strncmp(event_priv
->desc
->event_name
, event_name
,
1273 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1274 && event_notifier_group
== event_notifier_priv
->group
1275 && token
== event_priv
->user_token
) {
1281 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1286 event_notifier
= container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1289 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1290 /* Event will be enabled by enabler sync. */
1292 event
->priv
->registered
= 0;
1293 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1294 if (!event
->priv
->desc
) {
1296 goto register_error
;
1298 /* Populate lttng_event_notifier structure before event registration. */
1302 case LTTNG_KERNEL_ABI_KPROBE
:
1304 * Needs to be explicitly enabled after creation, since
1305 * we may want to apply filters.
1308 event
->priv
->registered
= 1;
1310 * Populate lttng_event_notifier structure before event
1314 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1315 event_param
->u
.kprobe
.symbol_name
,
1316 event_param
->u
.kprobe
.offset
,
1317 event_param
->u
.kprobe
.addr
,
1321 goto register_error
;
1323 ret
= try_module_get(event
->priv
->desc
->owner
);
1327 case LTTNG_KERNEL_ABI_SYSCALL
:
1329 * Needs to be explicitly enabled after creation, since
1330 * we may want to apply filters.
1333 event
->priv
->registered
= 0;
1334 event
->priv
->desc
= event_desc
;
1335 switch (event_param
->u
.syscall
.entryexit
) {
1336 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1338 goto register_error
;
1339 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1340 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1342 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1343 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1346 switch (event_param
->u
.syscall
.abi
) {
1347 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1349 goto register_error
;
1350 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1351 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1353 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1354 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1358 if (!event
->priv
->desc
) {
1360 goto register_error
;
1364 case LTTNG_KERNEL_ABI_UPROBE
:
1366 * Needs to be explicitly enabled after creation, since
1367 * we may want to apply filters.
1370 event
->priv
->registered
= 1;
1373 * Populate lttng_event_notifier structure before
1374 * event_notifier registration.
1378 ret
= lttng_uprobes_register_event(event_param
->name
,
1379 event_param
->u
.uprobe
.fd
,
1382 goto register_error
;
1383 ret
= try_module_get(event
->priv
->desc
->owner
);
1387 case LTTNG_KERNEL_ABI_KRETPROBE
:
1389 case LTTNG_KERNEL_ABI_FUNCTION
:
1391 case LTTNG_KERNEL_ABI_NOOP
:
1396 goto register_error
;
1399 list_add(&event
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1400 hlist_add_head(&event
->priv
->hlist_node
, head
);
1403 * Clear the error counter bucket. The sessiond keeps track of which
1404 * bucket is currently in use. We trust it. The session lock
1405 * synchronizes against concurrent creation of the error
1408 error_counter
= event_notifier_group
->error_counter
;
1409 if (error_counter
) {
1410 size_t dimension_index
[1];
1413 * Check that the index is within the boundary of the counter.
1415 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1416 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1417 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1419 goto register_error
;
1422 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1423 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1425 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1426 event_notifier
->priv
->error_counter_index
);
1427 goto register_error
;
1431 return event_notifier
;
1434 lttng_kernel_event_free(event
);
1438 return ERR_PTR(ret
);
1441 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1442 const struct lttng_kernel_event_desc
*event_desc
)
1444 switch (event_enabler
->enabler_type
) {
1445 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1447 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1448 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1449 struct lttng_kernel_event_recorder
*event_recorder
;
1451 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1452 if (!event_recorder
)
1454 return &event_recorder
->parent
;
1456 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1458 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1459 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1460 struct lttng_kernel_event_notifier
*event_notifier
;
1462 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1463 if (!event_notifier
)
1465 return &event_notifier
->parent
;
1472 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1473 const struct lttng_kernel_event_desc
*event_desc
)
1475 struct lttng_kernel_event_common
*event
;
1477 mutex_lock(&sessions_mutex
);
1478 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1479 mutex_unlock(&sessions_mutex
);
1485 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1486 const size_t *dim_indexes
, int32_t cpu
,
1487 int64_t *val
, bool *overflow
, bool *underflow
)
1489 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1490 cpu
, val
, overflow
, underflow
);
1493 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1494 const size_t *dim_indexes
, int64_t *val
,
1495 bool *overflow
, bool *underflow
)
1497 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1498 val
, overflow
, underflow
);
1501 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1502 const size_t *dim_indexes
)
1504 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1507 /* Only used for tracepoints for now. */
1509 void register_event(struct lttng_kernel_event_common
*event
)
1511 const struct lttng_kernel_event_desc
*desc
;
1514 if (event
->priv
->registered
)
1517 desc
= event
->priv
->desc
;
1518 switch (event
->priv
->instrumentation
) {
1519 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1520 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1521 desc
->tp_class
->probe_callback
,
1525 case LTTNG_KERNEL_ABI_SYSCALL
:
1526 ret
= lttng_syscall_filter_enable_event(event
);
1529 case LTTNG_KERNEL_ABI_KPROBE
:
1531 case LTTNG_KERNEL_ABI_UPROBE
:
1535 case LTTNG_KERNEL_ABI_KRETPROBE
:
1536 switch (event
->type
) {
1537 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1540 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1546 case LTTNG_KERNEL_ABI_FUNCTION
:
1548 case LTTNG_KERNEL_ABI_NOOP
:
1554 event
->priv
->registered
= 1;
1557 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1559 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1560 const struct lttng_kernel_event_desc
*desc
;
1563 if (!event_priv
->registered
)
1566 desc
= event_priv
->desc
;
1567 switch (event_priv
->instrumentation
) {
1568 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1569 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1570 event_priv
->desc
->tp_class
->probe_callback
,
1574 case LTTNG_KERNEL_ABI_KPROBE
:
1575 lttng_kprobes_unregister_event(event
);
1579 case LTTNG_KERNEL_ABI_KRETPROBE
:
1580 switch (event
->type
) {
1581 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1582 lttng_kretprobes_unregister(event
);
1585 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1591 case LTTNG_KERNEL_ABI_SYSCALL
:
1592 ret
= lttng_syscall_filter_disable_event(event
);
1595 case LTTNG_KERNEL_ABI_NOOP
:
1596 switch (event
->type
) {
1597 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1600 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1606 case LTTNG_KERNEL_ABI_UPROBE
:
1607 lttng_uprobes_unregister_event(event
);
1611 case LTTNG_KERNEL_ABI_FUNCTION
:
1617 event_priv
->registered
= 0;
1622 * Only used internally at session destruction.
1625 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1627 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1628 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1630 lttng_free_event_filter_runtime(event
);
1631 /* Free event enabler refs */
1632 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1633 &event_priv
->enablers_ref_head
, node
)
1636 switch (event
->type
) {
1637 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1639 struct lttng_kernel_event_recorder
*event_recorder
=
1640 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1642 switch (event_priv
->instrumentation
) {
1643 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1644 lttng_event_desc_put(event_priv
->desc
);
1647 case LTTNG_KERNEL_ABI_KPROBE
:
1648 module_put(event_priv
->desc
->owner
);
1649 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1652 case LTTNG_KERNEL_ABI_KRETPROBE
:
1653 module_put(event_priv
->desc
->owner
);
1654 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1657 case LTTNG_KERNEL_ABI_SYSCALL
:
1660 case LTTNG_KERNEL_ABI_UPROBE
:
1661 module_put(event_priv
->desc
->owner
);
1662 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1665 case LTTNG_KERNEL_ABI_FUNCTION
:
1667 case LTTNG_KERNEL_ABI_NOOP
:
1672 list_del(&event_recorder
->priv
->parent
.node
);
1673 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1674 kmem_cache_free(event_recorder_cache
, event_recorder
);
1677 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1679 struct lttng_kernel_event_notifier
*event_notifier
=
1680 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1682 switch (event_notifier
->priv
->parent
.instrumentation
) {
1683 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1684 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1687 case LTTNG_KERNEL_ABI_KPROBE
:
1688 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1689 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1692 case LTTNG_KERNEL_ABI_SYSCALL
:
1695 case LTTNG_KERNEL_ABI_UPROBE
:
1696 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1697 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1700 case LTTNG_KERNEL_ABI_KRETPROBE
:
1702 case LTTNG_KERNEL_ABI_FUNCTION
:
1704 case LTTNG_KERNEL_ABI_NOOP
:
1709 list_del(&event_notifier
->priv
->parent
.node
);
1710 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1711 kmem_cache_free(event_notifier_cache
, event_notifier
);
1719 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1720 enum tracker_type tracker_type
)
1722 switch (tracker_type
) {
1724 return &session
->pid_tracker
;
1726 return &session
->vpid_tracker
;
1728 return &session
->uid_tracker
;
1730 return &session
->vuid_tracker
;
1732 return &session
->gid_tracker
;
1734 return &session
->vgid_tracker
;
1741 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1742 enum tracker_type tracker_type
, int id
)
1744 struct lttng_kernel_id_tracker
*tracker
;
1747 tracker
= get_tracker(session
, tracker_type
);
1752 mutex_lock(&sessions_mutex
);
1754 /* track all ids: destroy tracker. */
1755 lttng_id_tracker_destroy(tracker
, true);
1758 ret
= lttng_id_tracker_add(tracker
, id
);
1760 mutex_unlock(&sessions_mutex
);
1764 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1765 enum tracker_type tracker_type
, int id
)
1767 struct lttng_kernel_id_tracker
*tracker
;
1770 tracker
= get_tracker(session
, tracker_type
);
1775 mutex_lock(&sessions_mutex
);
1777 /* untrack all ids: replace by empty tracker. */
1778 ret
= lttng_id_tracker_empty_set(tracker
);
1780 ret
= lttng_id_tracker_del(tracker
, id
);
1782 mutex_unlock(&sessions_mutex
);
1787 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1789 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1790 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1791 struct lttng_id_hash_node
*e
;
1794 mutex_lock(&sessions_mutex
);
1796 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1797 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1799 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1805 /* ID tracker disabled. */
1806 if (iter
>= *pos
&& iter
== 0) {
1807 return id_tracker_p
; /* empty tracker */
1815 /* Called with sessions_mutex held. */
1817 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1819 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1820 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1821 struct lttng_id_hash_node
*e
;
1826 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1827 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1829 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1830 if (iter
++ >= *ppos
)
1835 /* ID tracker disabled. */
1836 if (iter
>= *ppos
&& iter
== 0)
1837 return p
; /* empty tracker */
1846 void id_list_stop(struct seq_file
*m
, void *p
)
1848 mutex_unlock(&sessions_mutex
);
1852 int id_list_show(struct seq_file
*m
, void *p
)
1854 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1855 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1858 if (p
== id_tracker_p
) {
1859 /* Tracker disabled. */
1862 const struct lttng_id_hash_node
*e
= p
;
1864 id
= lttng_id_tracker_get_node_id(e
);
1866 switch (id_tracker
->priv
->tracker_type
) {
1868 seq_printf(m
, "process { pid = %d; };\n", id
);
1871 seq_printf(m
, "process { vpid = %d; };\n", id
);
1874 seq_printf(m
, "user { uid = %d; };\n", id
);
1877 seq_printf(m
, "user { vuid = %d; };\n", id
);
1880 seq_printf(m
, "group { gid = %d; };\n", id
);
1883 seq_printf(m
, "group { vgid = %d; };\n", id
);
1886 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1892 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1893 .start
= id_list_start
,
1894 .next
= id_list_next
,
1895 .stop
= id_list_stop
,
1896 .show
= id_list_show
,
1900 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1902 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1906 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1908 struct seq_file
*m
= file
->private_data
;
1909 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1912 WARN_ON_ONCE(!id_tracker
);
1913 ret
= seq_release(inode
, file
);
1915 fput(id_tracker
->priv
->session
->priv
->file
);
1919 const struct file_operations lttng_tracker_ids_list_fops
= {
1920 .owner
= THIS_MODULE
,
1921 .open
= lttng_tracker_ids_list_open
,
1923 .llseek
= seq_lseek
,
1924 .release
= lttng_tracker_ids_list_release
,
1927 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1928 enum tracker_type tracker_type
)
1930 struct file
*tracker_ids_list_file
;
1934 file_fd
= lttng_get_unused_fd();
1940 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1941 <tng_tracker_ids_list_fops
,
1943 if (IS_ERR(tracker_ids_list_file
)) {
1944 ret
= PTR_ERR(tracker_ids_list_file
);
1947 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1949 goto refcount_error
;
1951 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1954 m
= tracker_ids_list_file
->private_data
;
1956 m
->private = get_tracker(session
, tracker_type
);
1957 BUG_ON(!m
->private);
1958 fd_install(file_fd
, tracker_ids_list_file
);
1963 atomic_long_dec(&session
->priv
->file
->f_count
);
1965 fput(tracker_ids_list_file
);
1967 put_unused_fd(file_fd
);
1973 * Enabler management.
1976 int lttng_match_enabler_star_glob(const char *desc_name
,
1977 const char *pattern
)
1979 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1980 desc_name
, LTTNG_SIZE_MAX
))
1986 int lttng_match_enabler_name(const char *desc_name
,
1989 if (strcmp(desc_name
, name
))
1995 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1996 struct lttng_event_enabler_common
*enabler
)
1998 const char *desc_name
, *enabler_name
;
1999 bool compat
= false, entry
= false;
2001 enabler_name
= enabler
->event_param
.name
;
2002 switch (enabler
->event_param
.instrumentation
) {
2003 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2004 desc_name
= desc
->event_name
;
2005 switch (enabler
->format_type
) {
2006 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2007 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2008 case LTTNG_ENABLER_FORMAT_NAME
:
2009 return lttng_match_enabler_name(desc_name
, enabler_name
);
2015 case LTTNG_KERNEL_ABI_SYSCALL
:
2016 desc_name
= desc
->event_name
;
2017 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2018 desc_name
+= strlen("compat_");
2021 if (!strncmp(desc_name
, "syscall_exit_",
2022 strlen("syscall_exit_"))) {
2023 desc_name
+= strlen("syscall_exit_");
2024 } else if (!strncmp(desc_name
, "syscall_entry_",
2025 strlen("syscall_entry_"))) {
2026 desc_name
+= strlen("syscall_entry_");
2032 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2033 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2035 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2039 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2046 switch (enabler
->event_param
.u
.syscall
.abi
) {
2047 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2049 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2053 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2060 switch (enabler
->event_param
.u
.syscall
.match
) {
2061 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2062 switch (enabler
->format_type
) {
2063 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2064 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2065 case LTTNG_ENABLER_FORMAT_NAME
:
2066 return lttng_match_enabler_name(desc_name
, enabler_name
);
2071 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2072 return -EINVAL
; /* Not implemented. */
2084 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2085 struct lttng_event_enabler_common
*enabler
)
2089 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2097 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2098 struct lttng_kernel_event_common
*event
)
2100 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2103 switch (event_enabler
->enabler_type
) {
2104 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2106 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2107 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2108 struct lttng_kernel_event_recorder
*event_recorder
=
2109 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2111 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2112 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2117 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2119 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2120 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2121 struct lttng_kernel_event_notifier
*event_notifier
=
2122 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2124 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2125 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2126 && event
->priv
->user_token
== event_enabler
->user_token
)
2137 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2138 const struct lttng_kernel_event_desc
*desc
,
2139 struct lttng_kernel_event_common
*event
)
2141 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2144 switch (event_enabler
->enabler_type
) {
2145 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2147 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2148 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2149 struct lttng_kernel_event_recorder
*event_recorder
=
2150 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2152 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2157 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2159 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2160 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2161 struct lttng_kernel_event_notifier
*event_notifier
=
2162 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2164 if (event
->priv
->desc
== desc
2165 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2166 && event
->priv
->user_token
== event_enabler
->user_token
)
2178 struct lttng_enabler_ref
*lttng_enabler_ref(
2179 struct list_head
*enablers_ref_list
,
2180 struct lttng_event_enabler_common
*enabler
)
2182 struct lttng_enabler_ref
*enabler_ref
;
2184 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2185 if (enabler_ref
->ref
== enabler
)
2192 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2194 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2195 struct lttng_kernel_probe_desc
*probe_desc
;
2196 const struct lttng_kernel_event_desc
*desc
;
2197 struct list_head
*probe_list
;
2200 probe_list
= lttng_get_probe_list_head();
2202 * For each probe event, if we find that a probe event matches
2203 * our enabler, create an associated lttng_event if not
2206 list_for_each_entry(probe_desc
, probe_list
, head
) {
2207 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2209 struct hlist_head
*head
;
2210 struct lttng_kernel_event_common
*event
;
2211 struct lttng_kernel_event_common_private
*event_priv
;
2213 desc
= probe_desc
->event_desc
[i
];
2214 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2218 * Check if already created.
2220 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2221 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2222 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2229 * We need to create an event for this event probe.
2231 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2233 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2234 probe_desc
->event_desc
[i
]->event_name
);
2241 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2245 ret
= lttng_syscalls_register_event(event_enabler
);
2250 * Create event if it is missing and present in the list of tracepoint probes.
2251 * Should be called with sessions mutex held.
2254 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2256 switch (event_enabler
->event_param
.instrumentation
) {
2257 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2258 lttng_create_tracepoint_event_if_missing(event_enabler
);
2261 case LTTNG_KERNEL_ABI_SYSCALL
:
2262 lttng_create_syscall_event_if_missing(event_enabler
);
2272 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2273 struct lttng_kernel_event_common
*event
)
2275 /* Link filter bytecodes if not linked yet. */
2276 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2277 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2281 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2282 struct lttng_kernel_event_common
*event
)
2284 switch (event_enabler
->enabler_type
) {
2285 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2287 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2289 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2290 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2291 struct lttng_kernel_event_notifier
*event_notifier
=
2292 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2294 /* Link capture bytecodes if not linked yet. */
2295 lttng_enabler_link_bytecode(event
->priv
->desc
,
2296 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2297 &event_notifier_enabler
->capture_bytecode_head
);
2298 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2307 * Create events associated with an event_enabler (if not already present),
2308 * and add backward reference from the event to the enabler.
2309 * Should be called with sessions mutex held.
2312 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2314 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2315 struct lttng_kernel_event_common_private
*event_priv
;
2317 lttng_syscall_table_set_wildcard_all(event_enabler
);
2319 /* First ensure that probe events are created for this enabler. */
2320 lttng_create_event_if_missing(event_enabler
);
2322 /* Link the created event with its associated enabler. */
2323 list_for_each_entry(event_priv
, event_list_head
, node
) {
2324 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2325 struct lttng_enabler_ref
*enabler_ref
;
2327 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2330 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2333 * If no backward ref, create it.
2334 * Add backward ref from event_notifier to enabler.
2336 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2340 enabler_ref
->ref
= event_enabler
;
2341 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2344 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2345 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2351 * Called at module load: connect the probe on all enablers matching
2353 * Called with sessions lock held.
2355 int lttng_fix_pending_events(void)
2357 struct lttng_kernel_session_private
*session_priv
;
2359 list_for_each_entry(session_priv
, &sessions
, list
)
2360 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2364 static bool lttng_event_notifier_group_has_active_event_notifiers(
2365 struct lttng_event_notifier_group
*event_notifier_group
)
2367 struct lttng_event_enabler_common
*event_enabler
;
2369 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2370 if (event_enabler
->enabled
)
2376 bool lttng_event_notifier_active(void)
2378 struct lttng_event_notifier_group
*event_notifier_group
;
2380 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2381 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2387 int lttng_fix_pending_event_notifiers(void)
2389 struct lttng_event_notifier_group
*event_notifier_group
;
2391 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2392 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2396 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2397 enum lttng_enabler_format_type format_type
,
2398 struct lttng_kernel_abi_event
*event_param
,
2399 struct lttng_kernel_channel_buffer
*chan
)
2401 struct lttng_event_recorder_enabler
*event_enabler
;
2403 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2406 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2407 event_enabler
->parent
.format_type
= format_type
;
2408 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2409 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2410 sizeof(event_enabler
->parent
.event_param
));
2411 event_enabler
->chan
= chan
;
2413 event_enabler
->parent
.enabled
= 0;
2414 return event_enabler
;
2417 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2418 struct lttng_event_recorder_enabler
*event_enabler
)
2420 mutex_lock(&sessions_mutex
);
2421 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2422 event_enabler
->parent
.published
= true;
2423 lttng_session_lazy_sync_event_enablers(session
);
2424 mutex_unlock(&sessions_mutex
);
2427 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2429 mutex_lock(&sessions_mutex
);
2430 event_enabler
->enabled
= 1;
2431 lttng_event_enabler_sync(event_enabler
);
2432 mutex_unlock(&sessions_mutex
);
2436 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2438 mutex_lock(&sessions_mutex
);
2439 event_enabler
->enabled
= 0;
2440 lttng_event_enabler_sync(event_enabler
);
2441 mutex_unlock(&sessions_mutex
);
2446 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2447 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2449 struct lttng_kernel_bytecode_node
*bytecode_node
;
2450 uint32_t bytecode_len
;
2453 ret
= get_user(bytecode_len
, &bytecode
->len
);
2456 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2460 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2461 sizeof(*bytecode
) + bytecode_len
);
2465 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2466 bytecode_node
->enabler
= enabler
;
2467 /* Enforce length based on allocated size */
2468 bytecode_node
->bc
.len
= bytecode_len
;
2469 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2474 lttng_kvfree(bytecode_node
);
2478 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2479 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2482 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2485 lttng_event_enabler_sync(event_enabler
);
2492 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2493 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2496 switch (event
->priv
->instrumentation
) {
2497 case LTTNG_KERNEL_ABI_UPROBE
:
2498 return lttng_uprobes_event_add_callsite(event
, callsite
);
2505 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2507 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2509 /* Destroy filter bytecode */
2510 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2511 &enabler
->filter_bytecode_head
, node
) {
2512 lttng_kvfree(filter_node
);
2516 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2518 lttng_enabler_destroy(event_enabler
);
2519 if (event_enabler
->published
)
2520 list_del(&event_enabler
->node
);
2522 switch (event_enabler
->enabler_type
) {
2523 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2525 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2526 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2528 kfree(event_recorder_enabler
);
2531 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2533 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2534 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2536 kfree(event_notifier_enabler
);
2544 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2545 enum lttng_enabler_format_type format_type
,
2546 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2547 struct lttng_event_notifier_group
*event_notifier_group
)
2549 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2551 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2552 if (!event_notifier_enabler
)
2555 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2556 event_notifier_enabler
->parent
.format_type
= format_type
;
2557 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2558 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2560 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2561 event_notifier_enabler
->num_captures
= 0;
2563 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2564 sizeof(event_notifier_enabler
->parent
.event_param
));
2566 event_notifier_enabler
->parent
.enabled
= 0;
2567 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2568 event_notifier_enabler
->group
= event_notifier_group
;
2569 return event_notifier_enabler
;
2572 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2573 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2575 mutex_lock(&sessions_mutex
);
2576 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2577 event_notifier_enabler
->parent
.published
= true;
2578 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2579 mutex_unlock(&sessions_mutex
);
2582 int lttng_event_notifier_enabler_enable(
2583 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2585 mutex_lock(&sessions_mutex
);
2586 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2587 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2588 mutex_unlock(&sessions_mutex
);
2592 int lttng_event_notifier_enabler_disable(
2593 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2595 mutex_lock(&sessions_mutex
);
2596 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2597 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2598 mutex_unlock(&sessions_mutex
);
2602 int lttng_event_notifier_enabler_attach_capture_bytecode(
2603 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2604 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2606 struct lttng_kernel_bytecode_node
*bytecode_node
;
2607 struct lttng_event_enabler_common
*enabler
=
2608 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2609 uint32_t bytecode_len
;
2612 ret
= get_user(bytecode_len
, &bytecode
->len
);
2616 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2621 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2622 sizeof(*bytecode
) + bytecode_len
);
2626 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2627 bytecode_node
->enabler
= enabler
;
2629 /* Enforce length based on allocated size */
2630 bytecode_node
->bc
.len
= bytecode_len
;
2631 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2633 event_notifier_enabler
->num_captures
++;
2635 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2639 lttng_kvfree(bytecode_node
);
2645 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2647 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2648 struct lttng_kernel_bytecode_runtime
*runtime
;
2649 struct lttng_enabler_ref
*enabler_ref
;
2651 /* Check if has enablers without bytecode enabled */
2652 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2653 if (enabler_ref
->ref
->enabled
2654 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2655 has_enablers_without_filter_bytecode
= 1;
2659 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2661 /* Enable filters */
2662 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2663 lttng_bytecode_sync_state(runtime
);
2666 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2670 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2672 switch (event
->type
) {
2673 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2675 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2677 struct lttng_kernel_event_notifier
*event_notifier
=
2678 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2679 struct lttng_kernel_bytecode_runtime
*runtime
;
2680 int nr_captures
= 0;
2682 /* Enable captures */
2683 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2684 lttng_bytecode_sync_state(runtime
);
2687 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2696 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2698 struct lttng_enabler_ref
*enabler_ref
;
2699 bool enabled
= false;
2701 switch (event
->priv
->instrumentation
) {
2702 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2704 case LTTNG_KERNEL_ABI_SYSCALL
:
2706 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2707 if (enabler_ref
->ref
->enabled
) {
2718 switch (event
->type
) {
2719 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2721 struct lttng_kernel_event_recorder
*event_recorder
=
2722 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2725 * Enabled state is based on union of enablers, with
2726 * intersection of session and channel transient enable
2729 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2731 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2740 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2742 switch (event
->priv
->instrumentation
) {
2743 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2745 case LTTNG_KERNEL_ABI_SYSCALL
:
2749 /* Not handled with lazy sync. */
2755 * Should be called with sessions mutex held.
2758 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2759 struct list_head
*event_list
)
2761 struct lttng_kernel_event_common_private
*event_priv
;
2762 struct lttng_event_enabler_common
*event_enabler
;
2764 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2765 lttng_event_enabler_ref_events(event_enabler
);
2768 * For each event, if at least one of its enablers is enabled,
2769 * and its channel and session transient states are enabled, we
2770 * enable the event, else we disable it.
2772 list_for_each_entry(event_priv
, event_list
, node
) {
2773 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2776 if (!lttng_event_is_lazy_sync(event
))
2779 enabled
= lttng_get_event_enabled_state(event
);
2780 WRITE_ONCE(event
->enabled
, enabled
);
2782 * Sync tracepoint registration with event enabled state.
2785 register_event(event
);
2787 _lttng_event_unregister(event
);
2790 lttng_event_sync_filter_state(event
);
2791 lttng_event_sync_capture_state(event
);
2796 * lttng_session_sync_event_enablers should be called just before starting a
2800 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2802 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2806 * Apply enablers to session events, adding events to session if need
2807 * be. It is required after each modification applied to an active
2808 * session, and right before session "start".
2809 * "lazy" sync means we only sync if required.
2810 * Should be called with sessions mutex held.
2813 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2815 /* We can skip if session is not active */
2816 if (!session
->active
)
2818 lttng_session_sync_event_enablers(session
);
2822 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2824 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2828 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2830 switch (event_enabler
->enabler_type
) {
2831 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2833 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2834 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2835 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2838 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2840 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2841 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2842 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2851 * Serialize at most one packet worth of metadata into a metadata
2853 * We grab the metadata cache mutex to get exclusive access to our metadata
2854 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2855 * allows us to do racy operations such as looking for remaining space left in
2856 * packet and write, since mutual exclusion protects us from concurrent writes.
2857 * Mutual exclusion on the metadata cache allow us to read the cache content
2858 * without racing against reallocation of the cache by updates.
2859 * Returns the number of bytes written in the channel, 0 if no data
2860 * was written and a negative value on error.
2862 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2863 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2865 struct lttng_kernel_ring_buffer_ctx ctx
;
2867 size_t len
, reserve_len
;
2870 * Ensure we support mutiple get_next / put sequences followed by
2871 * put_next. The metadata cache lock protects reading the metadata
2872 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2873 * "flush" operations on the buffer invoked by different processes.
2874 * Moreover, since the metadata cache memory can be reallocated, we
2875 * need to have exclusive access against updates even though we only
2878 mutex_lock(&stream
->metadata_cache
->lock
);
2879 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2880 if (stream
->metadata_in
!= stream
->metadata_out
)
2883 /* Metadata regenerated, change the version. */
2884 if (stream
->metadata_cache
->version
!= stream
->version
)
2885 stream
->version
= stream
->metadata_cache
->version
;
2887 len
= stream
->metadata_cache
->metadata_written
-
2888 stream
->metadata_in
;
2891 reserve_len
= min_t(size_t,
2892 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2894 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2895 sizeof(char), NULL
);
2897 * If reservation failed, return an error to the caller.
2899 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2901 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2902 stream
->coherent
= false;
2905 stream
->transport
->ops
.event_write(&ctx
,
2906 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2908 stream
->transport
->ops
.event_commit(&ctx
);
2909 stream
->metadata_in
+= reserve_len
;
2910 if (reserve_len
< len
)
2911 stream
->coherent
= false;
2913 stream
->coherent
= true;
2918 *coherent
= stream
->coherent
;
2919 mutex_unlock(&stream
->metadata_cache
->lock
);
2924 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2926 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2927 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2931 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2933 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2934 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2935 struct lttng_metadata_stream
*stream
;
2937 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2938 wake_up_interruptible(&stream
->read_wait
);
2939 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2944 * Write the metadata to the metadata cache.
2945 * Must be called with sessions_mutex held.
2946 * The metadata cache lock protects us from concurrent read access from
2947 * thread outputting metadata content to ring buffer.
2948 * The content of the printf is printed as a single atomic metadata
2951 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2952 const char *fmt
, ...)
2958 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2961 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2967 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2968 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2969 session
->priv
->metadata_cache
->cache_alloc
) {
2970 char *tmp_cache_realloc
;
2971 unsigned int tmp_cache_alloc_size
;
2973 tmp_cache_alloc_size
= max_t(unsigned int,
2974 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2975 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2976 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2977 if (!tmp_cache_realloc
)
2979 if (session
->priv
->metadata_cache
->data
) {
2980 memcpy(tmp_cache_realloc
,
2981 session
->priv
->metadata_cache
->data
,
2982 session
->priv
->metadata_cache
->cache_alloc
);
2983 vfree(session
->priv
->metadata_cache
->data
);
2986 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2987 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2989 memcpy(session
->priv
->metadata_cache
->data
+
2990 session
->priv
->metadata_cache
->metadata_written
,
2992 session
->priv
->metadata_cache
->metadata_written
+= len
;
3003 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3007 for (i
= 0; i
< nesting
; i
++) {
3010 ret
= lttng_metadata_printf(session
, " ");
3019 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3020 const struct lttng_kernel_event_field
*field
,
3023 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3027 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3028 const struct lttng_kernel_type_integer
*type
,
3029 enum lttng_kernel_string_encoding parent_encoding
,
3034 ret
= print_tabs(session
, nesting
);
3037 ret
= lttng_metadata_printf(session
,
3038 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3042 (parent_encoding
== lttng_kernel_string_encoding_none
)
3044 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3048 #if __BYTE_ORDER == __BIG_ENDIAN
3049 type
->reverse_byte_order
? " byte_order = le;" : ""
3051 type
->reverse_byte_order
? " byte_order = be;" : ""
3058 * Must be called with sessions_mutex held.
3061 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3062 const struct lttng_kernel_type_struct
*type
,
3065 const char *prev_field_name
= NULL
;
3067 uint32_t i
, nr_fields
;
3068 unsigned int alignment
;
3070 ret
= print_tabs(session
, nesting
);
3073 ret
= lttng_metadata_printf(session
,
3077 nr_fields
= type
->nr_fields
;
3078 for (i
= 0; i
< nr_fields
; i
++) {
3079 const struct lttng_kernel_event_field
*iter_field
;
3081 iter_field
= type
->fields
[i
];
3082 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3086 ret
= print_tabs(session
, nesting
);
3089 alignment
= type
->alignment
;
3091 ret
= lttng_metadata_printf(session
,
3095 ret
= lttng_metadata_printf(session
,
3102 * Must be called with sessions_mutex held.
3105 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3106 const struct lttng_kernel_event_field
*field
,
3111 ret
= _lttng_struct_type_statedump(session
,
3112 lttng_kernel_get_type_struct(field
->type
), nesting
);
3115 return lttng_field_name_statedump(session
, field
, nesting
);
3119 * Must be called with sessions_mutex held.
3122 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3123 const struct lttng_kernel_type_variant
*type
,
3125 const char *prev_field_name
)
3127 const char *tag_name
;
3129 uint32_t i
, nr_choices
;
3131 tag_name
= type
->tag_name
;
3133 tag_name
= prev_field_name
;
3137 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3139 if (type
->alignment
!= 0)
3141 ret
= print_tabs(session
, nesting
);
3144 ret
= lttng_metadata_printf(session
,
3145 "variant <_%s> {\n",
3149 nr_choices
= type
->nr_choices
;
3150 for (i
= 0; i
< nr_choices
; i
++) {
3151 const struct lttng_kernel_event_field
*iter_field
;
3153 iter_field
= type
->choices
[i
];
3154 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3158 ret
= print_tabs(session
, nesting
);
3161 ret
= lttng_metadata_printf(session
,
3167 * Must be called with sessions_mutex held.
3170 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3171 const struct lttng_kernel_event_field
*field
,
3173 const char *prev_field_name
)
3177 ret
= _lttng_variant_type_statedump(session
,
3178 lttng_kernel_get_type_variant(field
->type
), nesting
,
3182 return lttng_field_name_statedump(session
, field
, nesting
);
3186 * Must be called with sessions_mutex held.
3189 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3190 const struct lttng_kernel_event_field
*field
,
3194 const struct lttng_kernel_type_array
*array_type
;
3195 const struct lttng_kernel_type_common
*elem_type
;
3197 array_type
= lttng_kernel_get_type_array(field
->type
);
3198 WARN_ON_ONCE(!array_type
);
3200 if (array_type
->alignment
) {
3201 ret
= print_tabs(session
, nesting
);
3204 ret
= lttng_metadata_printf(session
,
3205 "struct { } align(%u) _%s_padding;\n",
3206 array_type
->alignment
* CHAR_BIT
,
3212 * Nested compound types: Only array of structures and variants are
3213 * currently supported.
3215 elem_type
= array_type
->elem_type
;
3216 switch (elem_type
->type
) {
3217 case lttng_kernel_type_integer
:
3218 case lttng_kernel_type_struct
:
3219 case lttng_kernel_type_variant
:
3220 ret
= _lttng_type_statedump(session
, elem_type
,
3221 array_type
->encoding
, nesting
);
3229 ret
= lttng_metadata_printf(session
,
3232 array_type
->length
);
3237 * Must be called with sessions_mutex held.
3240 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3241 const struct lttng_kernel_event_field
*field
,
3243 const char *prev_field_name
)
3246 const char *length_name
;
3247 const struct lttng_kernel_type_sequence
*sequence_type
;
3248 const struct lttng_kernel_type_common
*elem_type
;
3250 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3251 WARN_ON_ONCE(!sequence_type
);
3253 length_name
= sequence_type
->length_name
;
3255 length_name
= prev_field_name
;
3259 if (sequence_type
->alignment
) {
3260 ret
= print_tabs(session
, nesting
);
3263 ret
= lttng_metadata_printf(session
,
3264 "struct { } align(%u) _%s_padding;\n",
3265 sequence_type
->alignment
* CHAR_BIT
,
3272 * Nested compound types: Only array of structures and variants are
3273 * currently supported.
3275 elem_type
= sequence_type
->elem_type
;
3276 switch (elem_type
->type
) {
3277 case lttng_kernel_type_integer
:
3278 case lttng_kernel_type_struct
:
3279 case lttng_kernel_type_variant
:
3280 ret
= _lttng_type_statedump(session
, elem_type
,
3281 sequence_type
->encoding
, nesting
);
3289 ret
= lttng_metadata_printf(session
,
3297 * Must be called with sessions_mutex held.
3300 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3301 const struct lttng_kernel_type_enum
*type
,
3304 const struct lttng_kernel_enum_desc
*enum_desc
;
3305 const struct lttng_kernel_type_common
*container_type
;
3307 unsigned int i
, nr_entries
;
3309 container_type
= type
->container_type
;
3310 if (container_type
->type
!= lttng_kernel_type_integer
) {
3314 enum_desc
= type
->desc
;
3315 nr_entries
= enum_desc
->nr_entries
;
3317 ret
= print_tabs(session
, nesting
);
3320 ret
= lttng_metadata_printf(session
, "enum : ");
3323 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3324 lttng_kernel_string_encoding_none
, 0);
3327 ret
= lttng_metadata_printf(session
, " {\n");
3330 /* Dump all entries */
3331 for (i
= 0; i
< nr_entries
; i
++) {
3332 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3335 ret
= print_tabs(session
, nesting
+ 1);
3338 ret
= lttng_metadata_printf(session
,
3342 len
= strlen(entry
->string
);
3343 /* Escape the character '"' */
3344 for (j
= 0; j
< len
; j
++) {
3345 char c
= entry
->string
[j
];
3349 ret
= lttng_metadata_printf(session
,
3353 ret
= lttng_metadata_printf(session
,
3357 ret
= lttng_metadata_printf(session
,
3364 ret
= lttng_metadata_printf(session
, "\"");
3368 if (entry
->options
.is_auto
) {
3369 ret
= lttng_metadata_printf(session
, ",\n");
3373 ret
= lttng_metadata_printf(session
,
3377 if (entry
->start
.signedness
)
3378 ret
= lttng_metadata_printf(session
,
3379 "%lld", (long long) entry
->start
.value
);
3381 ret
= lttng_metadata_printf(session
,
3382 "%llu", entry
->start
.value
);
3385 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3387 == entry
->end
.value
) {
3388 ret
= lttng_metadata_printf(session
,
3391 if (entry
->end
.signedness
) {
3392 ret
= lttng_metadata_printf(session
,
3394 (long long) entry
->end
.value
);
3396 ret
= lttng_metadata_printf(session
,
3405 ret
= print_tabs(session
, nesting
);
3408 ret
= lttng_metadata_printf(session
, "}");
3414 * Must be called with sessions_mutex held.
3417 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3418 const struct lttng_kernel_event_field
*field
,
3422 const struct lttng_kernel_type_enum
*enum_type
;
3424 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3425 WARN_ON_ONCE(!enum_type
);
3426 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3429 return lttng_field_name_statedump(session
, field
, nesting
);
3433 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3434 const struct lttng_kernel_event_field
*field
,
3439 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3440 lttng_kernel_string_encoding_none
, nesting
);
3443 return lttng_field_name_statedump(session
, field
, nesting
);
3447 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3448 const struct lttng_kernel_type_string
*type
,
3453 /* Default encoding is UTF8 */
3454 ret
= print_tabs(session
, nesting
);
3457 ret
= lttng_metadata_printf(session
,
3459 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3460 " { encoding = ASCII; }" : "");
3465 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3466 const struct lttng_kernel_event_field
*field
,
3469 const struct lttng_kernel_type_string
*string_type
;
3472 string_type
= lttng_kernel_get_type_string(field
->type
);
3473 WARN_ON_ONCE(!string_type
);
3474 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3477 return lttng_field_name_statedump(session
, field
, nesting
);
3481 * Must be called with sessions_mutex held.
3484 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3485 const struct lttng_kernel_type_common
*type
,
3486 enum lttng_kernel_string_encoding parent_encoding
,
3491 switch (type
->type
) {
3492 case lttng_kernel_type_integer
:
3493 ret
= _lttng_integer_type_statedump(session
,
3494 lttng_kernel_get_type_integer(type
),
3495 parent_encoding
, nesting
);
3497 case lttng_kernel_type_enum
:
3498 ret
= _lttng_enum_type_statedump(session
,
3499 lttng_kernel_get_type_enum(type
),
3502 case lttng_kernel_type_string
:
3503 ret
= _lttng_string_type_statedump(session
,
3504 lttng_kernel_get_type_string(type
),
3507 case lttng_kernel_type_struct
:
3508 ret
= _lttng_struct_type_statedump(session
,
3509 lttng_kernel_get_type_struct(type
),
3512 case lttng_kernel_type_variant
:
3513 ret
= _lttng_variant_type_statedump(session
,
3514 lttng_kernel_get_type_variant(type
),
3518 /* Nested arrays and sequences are not supported yet. */
3519 case lttng_kernel_type_array
:
3520 case lttng_kernel_type_sequence
:
3529 * Must be called with sessions_mutex held.
3532 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3533 const struct lttng_kernel_event_field
*field
,
3535 const char **prev_field_name_p
)
3537 const char *prev_field_name
= NULL
;
3540 if (prev_field_name_p
)
3541 prev_field_name
= *prev_field_name_p
;
3542 switch (field
->type
->type
) {
3543 case lttng_kernel_type_integer
:
3544 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3546 case lttng_kernel_type_enum
:
3547 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3549 case lttng_kernel_type_string
:
3550 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3552 case lttng_kernel_type_struct
:
3553 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3555 case lttng_kernel_type_array
:
3556 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3558 case lttng_kernel_type_sequence
:
3559 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3561 case lttng_kernel_type_variant
:
3562 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3569 if (prev_field_name_p
)
3570 *prev_field_name_p
= field
->name
;
3575 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3576 struct lttng_kernel_ctx
*ctx
)
3578 const char *prev_field_name
= NULL
;
3584 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3585 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3587 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3595 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3596 struct lttng_kernel_event_recorder
*event_recorder
)
3598 const char *prev_field_name
= NULL
;
3599 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3603 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3604 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3606 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3614 * Must be called with sessions_mutex held.
3615 * The entire event metadata is printed as a single atomic metadata
3619 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3620 struct lttng_kernel_channel_buffer
*chan
,
3621 struct lttng_kernel_event_recorder
*event_recorder
)
3625 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3627 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3630 lttng_metadata_begin(session
);
3632 ret
= lttng_metadata_printf(session
,
3636 " stream_id = %u;\n",
3637 event_recorder
->priv
->parent
.desc
->event_name
,
3638 event_recorder
->priv
->id
,
3639 event_recorder
->chan
->priv
->id
);
3643 ret
= lttng_metadata_printf(session
,
3644 " fields := struct {\n"
3649 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3654 * LTTng space reservation can only reserve multiples of the
3657 ret
= lttng_metadata_printf(session
,
3663 event_recorder
->priv
->metadata_dumped
= 1;
3665 lttng_metadata_end(session
);
3671 * Must be called with sessions_mutex held.
3672 * The entire channel metadata is printed as a single atomic metadata
3676 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3677 struct lttng_kernel_channel_buffer
*chan
)
3681 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3684 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3687 lttng_metadata_begin(session
);
3689 WARN_ON_ONCE(!chan
->priv
->header_type
);
3690 ret
= lttng_metadata_printf(session
,
3693 " event.header := %s;\n"
3694 " packet.context := struct packet_context;\n",
3696 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3697 "struct event_header_large");
3701 if (chan
->priv
->ctx
) {
3702 ret
= lttng_metadata_printf(session
,
3703 " event.context := struct {\n");
3707 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3710 if (chan
->priv
->ctx
) {
3711 ret
= lttng_metadata_printf(session
,
3717 ret
= lttng_metadata_printf(session
,
3720 chan
->priv
->metadata_dumped
= 1;
3722 lttng_metadata_end(session
);
3727 * Must be called with sessions_mutex held.
3730 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3732 return lttng_metadata_printf(session
,
3733 "struct packet_context {\n"
3734 " uint64_clock_monotonic_t timestamp_begin;\n"
3735 " uint64_clock_monotonic_t timestamp_end;\n"
3736 " uint64_t content_size;\n"
3737 " uint64_t packet_size;\n"
3738 " uint64_t packet_seq_num;\n"
3739 " unsigned long events_discarded;\n"
3740 " uint32_t cpu_id;\n"
3747 * id: range: 0 - 30.
3748 * id 31 is reserved to indicate an extended header.
3751 * id: range: 0 - 65534.
3752 * id 65535 is reserved to indicate an extended header.
3754 * Must be called with sessions_mutex held.
3757 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3759 return lttng_metadata_printf(session
,
3760 "struct event_header_compact {\n"
3761 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3764 " uint27_clock_monotonic_t timestamp;\n"
3768 " uint64_clock_monotonic_t timestamp;\n"
3773 "struct event_header_large {\n"
3774 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3777 " uint32_clock_monotonic_t timestamp;\n"
3781 " uint64_clock_monotonic_t timestamp;\n"
3785 lttng_alignof(uint32_t) * CHAR_BIT
,
3786 lttng_alignof(uint16_t) * CHAR_BIT
3791 * Approximation of NTP time of day to clock monotonic correlation,
3792 * taken at start of trace.
3793 * Yes, this is only an approximation. Yes, we can (and will) do better
3794 * in future versions.
3795 * This function may return a negative offset. It may happen if the
3796 * system sets the REALTIME clock to 0 after boot.
3798 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3802 int64_t measure_clock_offset(void)
3804 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3805 uint64_t tcf
= trace_clock_freq();
3807 unsigned long flags
;
3808 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3809 struct timespec64 rts
= { 0, 0 };
3811 struct timespec rts
= { 0, 0 };
3814 /* Disable interrupts to increase correlation precision. */
3815 local_irq_save(flags
);
3816 monotonic
[0] = trace_clock_read64();
3817 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3818 ktime_get_real_ts64(&rts
);
3820 getnstimeofday(&rts
);
3822 monotonic
[1] = trace_clock_read64();
3823 local_irq_restore(flags
);
3825 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3826 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3827 if (tcf
== NSEC_PER_SEC
) {
3828 realtime
+= rts
.tv_nsec
;
3830 uint64_t n
= rts
.tv_nsec
* tcf
;
3832 do_div(n
, NSEC_PER_SEC
);
3835 offset
= (int64_t) realtime
- monotonic_avg
;
3840 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3848 while (cur
!= '\0') {
3851 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3855 ret
= lttng_metadata_printf(session
, "%c", '\\');
3858 /* We still print the current char */
3861 ret
= lttng_metadata_printf(session
, "%c", cur
);
3875 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3876 const char *field_value
)
3880 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3884 ret
= print_escaped_ctf_string(session
, field_value
);
3888 ret
= lttng_metadata_printf(session
, "\";\n");
3895 * Output metadata into this session's metadata buffers.
3896 * Must be called with sessions_mutex held.
3899 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3901 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3902 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3903 const char *product_uuid
;
3904 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3905 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3908 if (!LTTNG_READ_ONCE(session
->active
))
3911 lttng_metadata_begin(session
);
3913 if (session
->priv
->metadata_dumped
)
3916 snprintf(uuid_s
, sizeof(uuid_s
),
3917 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3918 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3919 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3920 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3921 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3923 ret
= lttng_metadata_printf(session
,
3924 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3925 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3926 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3927 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3928 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3929 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3930 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3936 " byte_order = %s;\n"
3937 " packet.header := struct {\n"
3938 " uint32_t magic;\n"
3939 " uint8_t uuid[16];\n"
3940 " uint32_t stream_id;\n"
3941 " uint64_t stream_instance_id;\n"
3944 lttng_alignof(uint8_t) * CHAR_BIT
,
3945 lttng_alignof(uint16_t) * CHAR_BIT
,
3946 lttng_alignof(uint32_t) * CHAR_BIT
,
3947 lttng_alignof(uint64_t) * CHAR_BIT
,
3948 sizeof(unsigned long) * CHAR_BIT
,
3949 lttng_alignof(unsigned long) * CHAR_BIT
,
3953 #if __BYTE_ORDER == __BIG_ENDIAN
3962 ret
= lttng_metadata_printf(session
,
3964 " hostname = \"%s\";\n"
3965 " domain = \"kernel\";\n"
3966 " sysname = \"%s\";\n"
3967 " kernel_release = \"%s\";\n"
3968 " kernel_version = \"%s\";\n"
3969 " tracer_name = \"lttng-modules\";\n"
3970 " tracer_major = %d;\n"
3971 " tracer_minor = %d;\n"
3972 " tracer_patchlevel = %d;\n"
3973 " trace_buffering_scheme = \"global\";\n",
3974 current
->nsproxy
->uts_ns
->name
.nodename
,
3978 LTTNG_MODULES_MAJOR_VERSION
,
3979 LTTNG_MODULES_MINOR_VERSION
,
3980 LTTNG_MODULES_PATCHLEVEL_VERSION
3985 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3988 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3989 session
->priv
->creation_time
);
3993 /* Add the product UUID to the 'env' section */
3994 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3996 ret
= lttng_metadata_printf(session
,
3997 " product_uuid = \"%s\";\n",
4004 /* Close the 'env' section */
4005 ret
= lttng_metadata_printf(session
, "};\n\n");
4009 ret
= lttng_metadata_printf(session
,
4011 " name = \"%s\";\n",
4017 if (!trace_clock_uuid(clock_uuid_s
)) {
4018 ret
= lttng_metadata_printf(session
,
4019 " uuid = \"%s\";\n",
4026 ret
= lttng_metadata_printf(session
,
4027 " description = \"%s\";\n"
4028 " freq = %llu; /* Frequency, in Hz */\n"
4029 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4032 trace_clock_description(),
4033 (unsigned long long) trace_clock_freq(),
4034 (long long) measure_clock_offset()
4039 ret
= lttng_metadata_printf(session
,
4040 "typealias integer {\n"
4041 " size = 27; align = 1; signed = false;\n"
4042 " map = clock.%s.value;\n"
4043 "} := uint27_clock_monotonic_t;\n"
4045 "typealias integer {\n"
4046 " size = 32; align = %u; signed = false;\n"
4047 " map = clock.%s.value;\n"
4048 "} := uint32_clock_monotonic_t;\n"
4050 "typealias integer {\n"
4051 " size = 64; align = %u; signed = false;\n"
4052 " map = clock.%s.value;\n"
4053 "} := uint64_clock_monotonic_t;\n\n",
4055 lttng_alignof(uint32_t) * CHAR_BIT
,
4057 lttng_alignof(uint64_t) * CHAR_BIT
,
4063 ret
= _lttng_stream_packet_context_declare(session
);
4067 ret
= _lttng_event_header_declare(session
);
4072 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4073 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4078 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4079 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4080 event_recorder_priv
->pub
);
4084 session
->priv
->metadata_dumped
= 1;
4086 lttng_metadata_end(session
);
4091 * lttng_transport_register - LTT transport registration
4092 * @transport: transport structure
4094 * Registers a transport which can be used as output to extract the data out of
4095 * LTTng. The module calling this registration function must ensure that no
4096 * trap-inducing code will be executed by the transport functions. E.g.
4097 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4098 * is made visible to the transport function. This registration acts as a
4099 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4100 * after its registration must it synchronize the TLBs.
4102 void lttng_transport_register(struct lttng_transport
*transport
)
4105 * Make sure no page fault can be triggered by the module about to be
4106 * registered. We deal with this here so we don't have to call
4107 * vmalloc_sync_mappings() in each module's init.
4109 wrapper_vmalloc_sync_mappings();
4111 mutex_lock(&sessions_mutex
);
4112 list_add_tail(&transport
->node
, <tng_transport_list
);
4113 mutex_unlock(&sessions_mutex
);
4115 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4118 * lttng_transport_unregister - LTT transport unregistration
4119 * @transport: transport structure
4121 void lttng_transport_unregister(struct lttng_transport
*transport
)
4123 mutex_lock(&sessions_mutex
);
4124 list_del(&transport
->node
);
4125 mutex_unlock(&sessions_mutex
);
4127 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4129 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4132 * Make sure no page fault can be triggered by the module about to be
4133 * registered. We deal with this here so we don't have to call
4134 * vmalloc_sync_mappings() in each module's init.
4136 wrapper_vmalloc_sync_mappings();
4138 mutex_lock(&sessions_mutex
);
4139 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4140 mutex_unlock(&sessions_mutex
);
4142 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4144 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4146 mutex_lock(&sessions_mutex
);
4147 list_del(&transport
->node
);
4148 mutex_unlock(&sessions_mutex
);
4150 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4152 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4154 enum cpuhp_state lttng_hp_prepare
;
4155 enum cpuhp_state lttng_hp_online
;
4157 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4159 struct lttng_cpuhp_node
*lttng_node
;
4161 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4162 switch (lttng_node
->component
) {
4163 case LTTNG_RING_BUFFER_FRONTEND
:
4165 case LTTNG_RING_BUFFER_BACKEND
:
4166 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4167 case LTTNG_RING_BUFFER_ITER
:
4169 case LTTNG_CONTEXT_PERF_COUNTERS
:
4176 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4178 struct lttng_cpuhp_node
*lttng_node
;
4180 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4181 switch (lttng_node
->component
) {
4182 case LTTNG_RING_BUFFER_FRONTEND
:
4183 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4184 case LTTNG_RING_BUFFER_BACKEND
:
4186 case LTTNG_RING_BUFFER_ITER
:
4188 case LTTNG_CONTEXT_PERF_COUNTERS
:
4189 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4195 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4197 struct lttng_cpuhp_node
*lttng_node
;
4199 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4200 switch (lttng_node
->component
) {
4201 case LTTNG_RING_BUFFER_FRONTEND
:
4202 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4203 case LTTNG_RING_BUFFER_BACKEND
:
4205 case LTTNG_RING_BUFFER_ITER
:
4206 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4207 case LTTNG_CONTEXT_PERF_COUNTERS
:
4208 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4214 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4216 struct lttng_cpuhp_node
*lttng_node
;
4218 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4219 switch (lttng_node
->component
) {
4220 case LTTNG_RING_BUFFER_FRONTEND
:
4221 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4222 case LTTNG_RING_BUFFER_BACKEND
:
4224 case LTTNG_RING_BUFFER_ITER
:
4226 case LTTNG_CONTEXT_PERF_COUNTERS
:
4233 static int __init
lttng_init_cpu_hotplug(void)
4237 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4238 lttng_hotplug_prepare
,
4239 lttng_hotplug_dead
);
4243 lttng_hp_prepare
= ret
;
4244 lttng_rb_set_hp_prepare(ret
);
4246 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4247 lttng_hotplug_online
,
4248 lttng_hotplug_offline
);
4250 cpuhp_remove_multi_state(lttng_hp_prepare
);
4251 lttng_hp_prepare
= 0;
4254 lttng_hp_online
= ret
;
4255 lttng_rb_set_hp_online(ret
);
4260 static void __exit
lttng_exit_cpu_hotplug(void)
4262 lttng_rb_set_hp_online(0);
4263 cpuhp_remove_multi_state(lttng_hp_online
);
4264 lttng_rb_set_hp_prepare(0);
4265 cpuhp_remove_multi_state(lttng_hp_prepare
);
4268 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4269 static int lttng_init_cpu_hotplug(void)
4273 static void lttng_exit_cpu_hotplug(void)
4276 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4278 static int __init
lttng_events_init(void)
4282 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4285 ret
= wrapper_get_pfnblock_flags_mask_init();
4288 ret
= wrapper_get_pageblock_flags_mask_init();
4291 ret
= lttng_probes_init();
4294 ret
= lttng_context_init();
4297 ret
= lttng_tracepoint_init();
4300 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4301 if (!event_recorder_cache
) {
4303 goto error_kmem_event_recorder
;
4305 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4306 if (!event_recorder_private_cache
) {
4308 goto error_kmem_event_recorder_private
;
4310 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4311 if (!event_notifier_cache
) {
4313 goto error_kmem_event_notifier
;
4315 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4316 if (!event_notifier_private_cache
) {
4318 goto error_kmem_event_notifier_private
;
4320 ret
= lttng_abi_init();
4323 ret
= lttng_logger_init();
4326 ret
= lttng_init_cpu_hotplug();
4329 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4330 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4331 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4332 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4333 LTTNG_MODULES_EXTRAVERSION
,
4335 #ifdef LTTNG_EXTRA_VERSION_GIT
4336 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4340 #ifdef LTTNG_EXTRA_VERSION_NAME
4341 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4345 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4346 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4347 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4351 lttng_logger_exit();
4355 kmem_cache_destroy(event_notifier_private_cache
);
4356 error_kmem_event_notifier_private
:
4357 kmem_cache_destroy(event_notifier_cache
);
4358 error_kmem_event_notifier
:
4359 kmem_cache_destroy(event_recorder_private_cache
);
4360 error_kmem_event_recorder_private
:
4361 kmem_cache_destroy(event_recorder_cache
);
4362 error_kmem_event_recorder
:
4363 lttng_tracepoint_exit();
4365 lttng_context_exit();
4366 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4367 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4368 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4369 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4370 LTTNG_MODULES_EXTRAVERSION
,
4372 #ifdef LTTNG_EXTRA_VERSION_GIT
4373 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4377 #ifdef LTTNG_EXTRA_VERSION_NAME
4378 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4385 module_init(lttng_events_init
);
4387 static void __exit
lttng_events_exit(void)
4389 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4391 lttng_exit_cpu_hotplug();
4392 lttng_logger_exit();
4394 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4395 lttng_session_destroy(session_priv
->pub
);
4396 kmem_cache_destroy(event_recorder_cache
);
4397 kmem_cache_destroy(event_recorder_private_cache
);
4398 kmem_cache_destroy(event_notifier_cache
);
4399 kmem_cache_destroy(event_notifier_private_cache
);
4400 lttng_tracepoint_exit();
4401 lttng_context_exit();
4402 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4403 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4404 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4405 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4406 LTTNG_MODULES_EXTRAVERSION
,
4408 #ifdef LTTNG_EXTRA_VERSION_GIT
4409 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4413 #ifdef LTTNG_EXTRA_VERSION_NAME
4414 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4420 module_exit(lttng_events_exit
);
4422 #include <generated/patches.h>
4423 #ifdef LTTNG_EXTRA_VERSION_GIT
4424 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4426 #ifdef LTTNG_EXTRA_VERSION_NAME
4427 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4429 MODULE_LICENSE("GPL and additional rights");
4430 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4431 MODULE_DESCRIPTION("LTTng tracer");
4432 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4433 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4434 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4435 LTTNG_MODULES_EXTRAVERSION
);