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 void _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
76 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
);
78 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
80 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
82 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
83 const struct lttng_kernel_type_common
*type
,
84 enum lttng_kernel_string_encoding parent_encoding
,
87 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
88 const struct lttng_kernel_event_field
*field
,
89 size_t nesting
, const char **prev_field_name_p
);
91 void synchronize_trace(void)
93 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
94 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
100 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
101 #ifdef CONFIG_PREEMPT_RT_FULL
104 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
105 #ifdef CONFIG_PREEMPT_RT
108 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
111 void lttng_lock_sessions(void)
113 mutex_lock(&sessions_mutex
);
116 void lttng_unlock_sessions(void)
118 mutex_unlock(&sessions_mutex
);
121 static struct lttng_transport
*lttng_transport_find(const char *name
)
123 struct lttng_transport
*transport
;
125 list_for_each_entry(transport
, <tng_transport_list
, node
) {
126 if (!strcmp(transport
->name
, name
))
133 * Called with sessions lock held.
135 int lttng_session_active(void)
137 struct lttng_kernel_session_private
*iter
;
139 list_for_each_entry(iter
, &sessions
, list
) {
140 if (iter
->pub
->active
)
146 struct lttng_kernel_session
*lttng_session_create(void)
148 struct lttng_kernel_session
*session
;
149 struct lttng_kernel_session_private
*session_priv
;
150 struct lttng_metadata_cache
*metadata_cache
;
153 mutex_lock(&sessions_mutex
);
154 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
157 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
159 goto err_free_session
;
160 session
->priv
= session_priv
;
161 session_priv
->pub
= session
;
163 INIT_LIST_HEAD(&session_priv
->chan
);
164 INIT_LIST_HEAD(&session_priv
->events
);
165 lttng_guid_gen(&session_priv
->uuid
);
167 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
170 goto err_free_session_private
;
171 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
172 if (!metadata_cache
->data
)
174 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
175 kref_init(&metadata_cache
->refcount
);
176 mutex_init(&metadata_cache
->lock
);
177 session_priv
->metadata_cache
= metadata_cache
;
178 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
179 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
180 sizeof(metadata_cache
->uuid
));
181 INIT_LIST_HEAD(&session_priv
->enablers_head
);
182 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
183 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
184 list_add(&session_priv
->list
, &sessions
);
186 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
187 goto tracker_alloc_error
;
188 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
189 goto tracker_alloc_error
;
190 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
195 goto tracker_alloc_error
;
196 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
197 goto tracker_alloc_error
;
199 mutex_unlock(&sessions_mutex
);
204 lttng_id_tracker_fini(&session
->pid_tracker
);
205 lttng_id_tracker_fini(&session
->vpid_tracker
);
206 lttng_id_tracker_fini(&session
->uid_tracker
);
207 lttng_id_tracker_fini(&session
->vuid_tracker
);
208 lttng_id_tracker_fini(&session
->gid_tracker
);
209 lttng_id_tracker_fini(&session
->vgid_tracker
);
211 kfree(metadata_cache
);
212 err_free_session_private
:
213 lttng_kvfree(session_priv
);
215 lttng_kvfree(session
);
217 mutex_unlock(&sessions_mutex
);
222 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
224 struct lttng_counter_transport
*transport
;
226 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
227 if (!strcmp(transport
->name
, name
))
233 struct lttng_counter
*lttng_kernel_counter_create(
234 const char *counter_transport_name
,
235 size_t number_dimensions
, const size_t *dimensions_sizes
)
237 struct lttng_counter
*counter
= NULL
;
238 struct lttng_counter_transport
*counter_transport
= NULL
;
240 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
241 if (!counter_transport
) {
242 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
243 counter_transport_name
);
246 if (!try_module_get(counter_transport
->owner
)) {
247 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
251 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
255 /* Create event notifier error counter. */
256 counter
->ops
= &counter_transport
->ops
;
257 counter
->transport
= counter_transport
;
259 counter
->counter
= counter
->ops
->counter_create(
260 number_dimensions
, dimensions_sizes
, 0);
261 if (!counter
->counter
) {
268 lttng_kvfree(counter
);
270 if (counter_transport
)
271 module_put(counter_transport
->owner
);
276 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
278 struct lttng_transport
*transport
= NULL
;
279 struct lttng_event_notifier_group
*event_notifier_group
;
280 const char *transport_name
= "relay-event-notifier";
281 size_t subbuf_size
= 4096; //TODO
282 size_t num_subbuf
= 16; //TODO
283 unsigned int switch_timer_interval
= 0;
284 unsigned int read_timer_interval
= 0;
287 mutex_lock(&sessions_mutex
);
289 transport
= lttng_transport_find(transport_name
);
291 printk(KERN_WARNING
"LTTng: transport %s not found\n",
295 if (!try_module_get(transport
->owner
)) {
296 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
301 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
303 if (!event_notifier_group
)
307 * Initialize the ring buffer used to store event notifier
310 event_notifier_group
->ops
= &transport
->ops
;
311 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
312 transport_name
, event_notifier_group
, NULL
,
313 subbuf_size
, num_subbuf
, switch_timer_interval
,
314 read_timer_interval
);
315 if (!event_notifier_group
->chan
)
318 event_notifier_group
->transport
= transport
;
320 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
321 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
322 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
323 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
325 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
327 mutex_unlock(&sessions_mutex
);
329 return event_notifier_group
;
332 lttng_kvfree(event_notifier_group
);
335 module_put(transport
->owner
);
337 mutex_unlock(&sessions_mutex
);
341 void metadata_cache_destroy(struct kref
*kref
)
343 struct lttng_metadata_cache
*cache
=
344 container_of(kref
, struct lttng_metadata_cache
, refcount
);
349 void lttng_session_destroy(struct lttng_kernel_session
*session
)
351 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
352 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
353 struct lttng_metadata_stream
*metadata_stream
;
354 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
357 mutex_lock(&sessions_mutex
);
358 WRITE_ONCE(session
->active
, 0);
359 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
360 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
363 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
)
364 _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
365 synchronize_trace(); /* Wait for in-flight events to complete */
366 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
367 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
370 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
371 lttng_event_enabler_destroy(event_enabler
);
372 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
373 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
374 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
375 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
376 _lttng_channel_destroy(chan_priv
->pub
);
378 mutex_lock(&session
->priv
->metadata_cache
->lock
);
379 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
380 _lttng_metadata_channel_hangup(metadata_stream
);
381 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
382 lttng_id_tracker_fini(&session
->pid_tracker
);
383 lttng_id_tracker_fini(&session
->vpid_tracker
);
384 lttng_id_tracker_fini(&session
->uid_tracker
);
385 lttng_id_tracker_fini(&session
->vuid_tracker
);
386 lttng_id_tracker_fini(&session
->gid_tracker
);
387 lttng_id_tracker_fini(&session
->vgid_tracker
);
388 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
389 list_del(&session
->priv
->list
);
390 mutex_unlock(&sessions_mutex
);
391 lttng_kvfree(session
->priv
);
392 lttng_kvfree(session
);
395 void lttng_event_notifier_group_destroy(
396 struct lttng_event_notifier_group
*event_notifier_group
)
398 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
399 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
402 if (!event_notifier_group
)
405 mutex_lock(&sessions_mutex
);
407 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
410 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
411 &event_notifier_group
->event_notifiers_head
, parent
.node
)
412 _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
414 /* Wait for in-flight event notifier to complete */
417 irq_work_sync(&event_notifier_group
->wakeup_pending
);
419 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
422 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
423 &event_notifier_group
->enablers_head
, node
)
424 lttng_event_enabler_destroy(event_enabler
);
426 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
427 &event_notifier_group
->event_notifiers_head
, parent
.node
)
428 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
430 if (event_notifier_group
->error_counter
) {
431 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
433 error_counter
->ops
->counter_destroy(error_counter
->counter
);
434 module_put(error_counter
->transport
->owner
);
435 lttng_kvfree(error_counter
);
436 event_notifier_group
->error_counter
= NULL
;
439 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
440 module_put(event_notifier_group
->transport
->owner
);
441 list_del(&event_notifier_group
->node
);
443 mutex_unlock(&sessions_mutex
);
444 lttng_kvfree(event_notifier_group
);
447 int lttng_session_statedump(struct lttng_kernel_session
*session
)
451 mutex_lock(&sessions_mutex
);
452 ret
= lttng_statedump_start(session
);
453 mutex_unlock(&sessions_mutex
);
457 int lttng_session_enable(struct lttng_kernel_session
*session
)
460 struct lttng_kernel_channel_buffer_private
*chan_priv
;
462 mutex_lock(&sessions_mutex
);
463 if (session
->active
) {
468 /* Set transient enabler state to "enabled" */
469 session
->priv
->tstate
= 1;
471 /* We need to sync enablers with session before activation. */
472 lttng_session_sync_event_enablers(session
);
475 * Snapshot the number of events per channel to know the type of header
478 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
479 if (chan_priv
->header_type
)
480 continue; /* don't change it if session stop/restart */
481 if (chan_priv
->free_event_id
< 31)
482 chan_priv
->header_type
= 1; /* compact */
484 chan_priv
->header_type
= 2; /* large */
487 /* Clear each stream's quiescent state. */
488 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
489 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
490 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
493 WRITE_ONCE(session
->active
, 1);
494 WRITE_ONCE(session
->priv
->been_active
, 1);
495 ret
= _lttng_session_metadata_statedump(session
);
497 WRITE_ONCE(session
->active
, 0);
500 ret
= lttng_statedump_start(session
);
502 WRITE_ONCE(session
->active
, 0);
504 mutex_unlock(&sessions_mutex
);
508 int lttng_session_disable(struct lttng_kernel_session
*session
)
511 struct lttng_kernel_channel_buffer_private
*chan_priv
;
513 mutex_lock(&sessions_mutex
);
514 if (!session
->active
) {
518 WRITE_ONCE(session
->active
, 0);
520 /* Set transient enabler state to "disabled" */
521 session
->priv
->tstate
= 0;
522 lttng_session_sync_event_enablers(session
);
524 /* Set each stream's quiescent state. */
525 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
526 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
527 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
530 mutex_unlock(&sessions_mutex
);
534 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
537 struct lttng_kernel_channel_buffer_private
*chan_priv
;
538 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
539 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
540 struct lttng_metadata_stream
*stream
;
542 mutex_lock(&sessions_mutex
);
543 if (!session
->active
) {
548 mutex_lock(&cache
->lock
);
549 memset(cache
->data
, 0, cache
->cache_alloc
);
550 cache
->metadata_written
= 0;
552 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
553 stream
->metadata_out
= 0;
554 stream
->metadata_in
= 0;
556 mutex_unlock(&cache
->lock
);
558 session
->priv
->metadata_dumped
= 0;
559 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
560 chan_priv
->metadata_dumped
= 0;
563 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
564 event_recorder_priv
->metadata_dumped
= 0;
567 ret
= _lttng_session_metadata_statedump(session
);
570 mutex_unlock(&sessions_mutex
);
575 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
577 struct lttng_kernel_channel_buffer
*chan_buf
;
579 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
581 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
582 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
587 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
591 mutex_lock(&sessions_mutex
);
592 if (is_channel_buffer_metadata(channel
)) {
596 if (channel
->enabled
) {
600 /* Set transient enabler state to "enabled" */
601 channel
->priv
->tstate
= 1;
602 lttng_session_sync_event_enablers(channel
->session
);
603 /* Set atomically the state to "enabled" */
604 WRITE_ONCE(channel
->enabled
, 1);
606 mutex_unlock(&sessions_mutex
);
610 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
614 mutex_lock(&sessions_mutex
);
615 if (is_channel_buffer_metadata(channel
)) {
619 if (!channel
->enabled
) {
623 /* Set atomically the state to "disabled" */
624 WRITE_ONCE(channel
->enabled
, 0);
625 /* Set transient enabler state to "enabled" */
626 channel
->priv
->tstate
= 0;
627 lttng_session_sync_event_enablers(channel
->session
);
629 mutex_unlock(&sessions_mutex
);
633 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
637 mutex_lock(&sessions_mutex
);
638 switch (event
->type
) {
639 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
641 struct lttng_kernel_event_recorder
*event_recorder
=
642 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
644 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
650 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
651 switch (event
->priv
->instrumentation
) {
652 case LTTNG_KERNEL_ABI_KRETPROBE
:
663 if (event
->enabled
) {
667 switch (event
->priv
->instrumentation
) {
668 case LTTNG_KERNEL_ABI_TRACEPOINT
:
670 case LTTNG_KERNEL_ABI_SYSCALL
:
674 case LTTNG_KERNEL_ABI_KPROBE
:
676 case LTTNG_KERNEL_ABI_UPROBE
:
677 WRITE_ONCE(event
->enabled
, 1);
680 case LTTNG_KERNEL_ABI_KRETPROBE
:
681 ret
= lttng_kretprobes_event_enable_state(event
, 1);
684 case LTTNG_KERNEL_ABI_FUNCTION
:
686 case LTTNG_KERNEL_ABI_NOOP
:
693 mutex_unlock(&sessions_mutex
);
697 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
701 mutex_lock(&sessions_mutex
);
702 switch (event
->type
) {
703 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
705 struct lttng_kernel_event_recorder
*event_recorder
=
706 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
708 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
714 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
715 switch (event
->priv
->instrumentation
) {
716 case LTTNG_KERNEL_ABI_KRETPROBE
:
727 if (!event
->enabled
) {
731 switch (event
->priv
->instrumentation
) {
732 case LTTNG_KERNEL_ABI_TRACEPOINT
:
734 case LTTNG_KERNEL_ABI_SYSCALL
:
738 case LTTNG_KERNEL_ABI_KPROBE
:
740 case LTTNG_KERNEL_ABI_UPROBE
:
741 WRITE_ONCE(event
->enabled
, 0);
744 case LTTNG_KERNEL_ABI_KRETPROBE
:
745 ret
= lttng_kretprobes_event_enable_state(event
, 0);
748 case LTTNG_KERNEL_ABI_FUNCTION
:
750 case LTTNG_KERNEL_ABI_NOOP
:
757 mutex_unlock(&sessions_mutex
);
761 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
762 const char *transport_name
,
764 size_t subbuf_size
, size_t num_subbuf
,
765 unsigned int switch_timer_interval
,
766 unsigned int read_timer_interval
,
767 enum channel_type channel_type
)
769 struct lttng_kernel_channel_buffer
*chan
;
770 struct lttng_kernel_channel_buffer_private
*chan_priv
;
771 struct lttng_transport
*transport
= NULL
;
773 mutex_lock(&sessions_mutex
);
774 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
775 goto active
; /* Refuse to add channel to active session */
776 transport
= lttng_transport_find(transport_name
);
778 printk(KERN_WARNING
"LTTng: transport %s not found\n",
782 if (!try_module_get(transport
->owner
)) {
783 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
786 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
789 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
792 chan
->priv
= chan_priv
;
793 chan_priv
->pub
= chan
;
794 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
795 chan
->parent
.session
= session
;
796 chan
->priv
->id
= session
->priv
->free_chan_id
++;
797 chan
->ops
= &transport
->ops
;
799 * Note: the channel creation op already writes into the packet
800 * headers. Therefore the "chan" information used as input
801 * should be already accessible.
803 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
804 chan
, buf_addr
, subbuf_size
, num_subbuf
,
805 switch_timer_interval
, read_timer_interval
);
806 if (!chan
->priv
->rb_chan
)
808 chan
->priv
->parent
.tstate
= 1;
809 chan
->parent
.enabled
= 1;
810 chan
->priv
->transport
= transport
;
811 chan
->priv
->channel_type
= channel_type
;
812 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
813 mutex_unlock(&sessions_mutex
);
822 module_put(transport
->owner
);
825 mutex_unlock(&sessions_mutex
);
830 * Only used internally at session destruction for per-cpu channels, and
831 * when metadata channel is released.
832 * Needs to be called with sessions mutex held.
835 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
837 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
838 module_put(chan
->priv
->transport
->owner
);
839 list_del(&chan
->priv
->node
);
840 lttng_kernel_destroy_context(chan
->priv
->ctx
);
845 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
847 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
849 /* Protect the metadata cache with the sessions_mutex. */
850 mutex_lock(&sessions_mutex
);
851 _lttng_channel_destroy(chan
);
852 mutex_unlock(&sessions_mutex
);
854 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
857 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
859 stream
->finalized
= 1;
860 wake_up_interruptible(&stream
->read_wait
);
864 bool lttng_kernel_event_id_available(struct lttng_event_enabler_common
*event_enabler
)
866 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
867 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
869 switch (event_enabler
->enabler_type
) {
870 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
872 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
873 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
874 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
877 case LTTNG_KERNEL_ABI_TRACEPOINT
:
879 case LTTNG_KERNEL_ABI_KPROBE
:
881 case LTTNG_KERNEL_ABI_SYSCALL
:
883 case LTTNG_KERNEL_ABI_UPROBE
:
884 if (chan
->priv
->free_event_id
== -1U)
887 case LTTNG_KERNEL_ABI_KRETPROBE
:
888 /* kretprobes require 2 event IDs. */
889 if (chan
->priv
->free_event_id
>= -2U)
897 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
906 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
908 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
909 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
911 switch (event_enabler
->enabler_type
) {
912 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
914 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
915 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
916 struct lttng_kernel_event_recorder
*event_recorder
;
917 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
918 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
920 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
923 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
924 if (!event_recorder_priv
) {
925 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
928 event_recorder_priv
->pub
= event_recorder
;
929 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
930 event_recorder
->priv
= event_recorder_priv
;
931 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
933 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
934 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
935 event_recorder
->priv
->parent
.instrumentation
= itype
;
936 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
937 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
939 event_recorder
->chan
= chan
;
940 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
941 return &event_recorder
->parent
;
943 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
945 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
946 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
947 struct lttng_kernel_event_notifier
*event_notifier
;
948 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
950 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
953 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
954 if (!event_notifier_priv
) {
955 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
958 event_notifier_priv
->pub
= event_notifier
;
959 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
960 event_notifier
->priv
= event_notifier_priv
;
961 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
963 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
964 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
965 event_notifier
->priv
->parent
.instrumentation
= itype
;
966 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
967 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
968 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
970 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
971 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
972 event_notifier
->priv
->num_captures
= 0;
973 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
974 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
975 return &event_notifier
->parent
;
983 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
985 switch (event
->type
) {
986 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
988 struct lttng_kernel_event_recorder
*event_recorder
=
989 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
991 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
992 kmem_cache_free(event_recorder_cache
, event_recorder
);
995 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
997 struct lttng_kernel_event_notifier
*event_notifier
=
998 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1000 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1001 kmem_cache_free(event_notifier_cache
, event_notifier
);
1010 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
1012 switch (event
->type
) {
1013 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1015 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1017 struct lttng_kernel_event_notifier
*event_notifier
=
1018 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1019 struct lttng_counter
*error_counter
;
1020 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
1021 size_t dimension_index
[1];
1025 * Clear the error counter bucket. The sessiond keeps track of which
1026 * bucket is currently in use. We trust it. The session lock
1027 * synchronizes against concurrent creation of the error
1030 error_counter
= event_notifier_group
->error_counter
;
1034 * Check that the index is within the boundary of the counter.
1036 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1037 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1038 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1042 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1043 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1045 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1046 event_notifier
->priv
->error_counter_index
);
1057 * Supports event creation while tracing session is active.
1058 * Needs to be called with sessions mutex held.
1060 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1061 const struct lttng_kernel_event_desc
*event_desc
)
1063 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
1064 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
1065 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
1066 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1067 struct lttng_kernel_event_common_private
*event_priv
;
1068 struct lttng_kernel_event_common
*event
;
1069 const char *event_name
;
1070 struct hlist_head
*head
;
1073 if (!lttng_kernel_event_id_available(event_enabler
)) {
1079 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1080 event_name
= event_desc
->event_name
;
1083 case LTTNG_KERNEL_ABI_KPROBE
:
1085 case LTTNG_KERNEL_ABI_UPROBE
:
1087 case LTTNG_KERNEL_ABI_KRETPROBE
:
1089 case LTTNG_KERNEL_ABI_SYSCALL
:
1090 event_name
= event_param
->name
;
1093 case LTTNG_KERNEL_ABI_FUNCTION
:
1095 case LTTNG_KERNEL_ABI_NOOP
:
1103 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1104 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1105 if (lttng_event_enabler_event_name_match_event(event_enabler
, event_name
, event_priv
->pub
)) {
1111 event
= lttng_kernel_event_alloc(event_enabler
);
1118 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1119 /* Event will be enabled by enabler sync. */
1121 event
->priv
->registered
= 0;
1122 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1123 if (!event
->priv
->desc
) {
1125 goto register_error
;
1127 /* Populate lttng_event structure before event registration. */
1131 case LTTNG_KERNEL_ABI_KPROBE
:
1133 * Needs to be explicitly enabled after creation, since
1134 * we may want to apply filters.
1137 event
->priv
->registered
= 1;
1139 * Populate lttng_event structure before event
1143 ret
= lttng_kprobes_register_event(event_name
,
1144 event_param
->u
.kprobe
.symbol_name
,
1145 event_param
->u
.kprobe
.offset
,
1146 event_param
->u
.kprobe
.addr
,
1150 goto register_error
;
1152 ret
= try_module_get(event
->priv
->desc
->owner
);
1156 case LTTNG_KERNEL_ABI_KRETPROBE
:
1158 struct lttng_kernel_event_common
*event_return
;
1160 /* kretprobe defines 2 events */
1162 * Needs to be explicitly enabled after creation, since
1163 * we may want to apply filters.
1166 event
->priv
->registered
= 1;
1168 event_return
= lttng_kernel_event_alloc(event_enabler
);
1174 event_return
->enabled
= 0;
1175 event_return
->priv
->registered
= 1;
1178 * Populate lttng_event structure before kretprobe registration.
1181 ret
= lttng_kretprobes_register(event_name
,
1182 event_param
->u
.kretprobe
.symbol_name
,
1183 event_param
->u
.kretprobe
.offset
,
1184 event_param
->u
.kretprobe
.addr
,
1185 event
, event_return
);
1187 lttng_kernel_event_free(event_return
);
1189 goto register_error
;
1191 /* Take 2 refs on the module: one per event. */
1192 ret
= try_module_get(event
->priv
->desc
->owner
);
1194 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1196 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1197 WARN_ON_ONCE(ret
> 0);
1199 lttng_kernel_event_free(event_return
);
1200 module_put(event_return
->priv
->desc
->owner
);
1201 module_put(event
->priv
->desc
->owner
);
1202 goto statedump_error
;
1204 list_add(&event_return
->priv
->node
, event_list_head
);
1208 case LTTNG_KERNEL_ABI_SYSCALL
:
1210 * Needs to be explicitly enabled after creation, since
1211 * we may want to apply filters.
1214 event
->priv
->registered
= 0;
1215 event
->priv
->desc
= event_desc
;
1216 switch (event_param
->u
.syscall
.entryexit
) {
1217 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1219 goto register_error
;
1220 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1221 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1223 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1224 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1227 switch (event_param
->u
.syscall
.abi
) {
1228 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1230 goto register_error
;
1231 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1232 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1234 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1235 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1238 if (!event
->priv
->desc
) {
1240 goto register_error
;
1244 case LTTNG_KERNEL_ABI_UPROBE
:
1246 * Needs to be explicitly enabled after creation, since
1247 * we may want to apply filters.
1250 event
->priv
->registered
= 1;
1253 * Populate lttng_event structure before event
1258 ret
= lttng_uprobes_register_event(event_param
->name
,
1259 event_param
->u
.uprobe
.fd
,
1262 goto register_error
;
1263 ret
= try_module_get(event
->priv
->desc
->owner
);
1267 case LTTNG_KERNEL_ABI_FUNCTION
:
1269 case LTTNG_KERNEL_ABI_NOOP
:
1274 goto register_error
;
1277 ret
= _lttng_event_recorder_metadata_statedump(event
);
1278 WARN_ON_ONCE(ret
> 0);
1280 goto statedump_error
;
1283 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1285 goto register_error
;
1287 hlist_add_head(&event
->priv
->hlist_node
, head
);
1288 list_add(&event
->priv
->node
, event_list_head
);
1293 /* If a statedump error occurs, events will not be readable. */
1295 lttng_kernel_event_free(event
);
1300 return ERR_PTR(ret
);
1303 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1304 const struct lttng_kernel_event_desc
*event_desc
)
1306 struct lttng_kernel_event_common
*event
;
1308 mutex_lock(&sessions_mutex
);
1309 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1310 mutex_unlock(&sessions_mutex
);
1314 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1315 const size_t *dim_indexes
, int32_t cpu
,
1316 int64_t *val
, bool *overflow
, bool *underflow
)
1318 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1319 cpu
, val
, overflow
, underflow
);
1322 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1323 const size_t *dim_indexes
, int64_t *val
,
1324 bool *overflow
, bool *underflow
)
1326 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1327 val
, overflow
, underflow
);
1330 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1331 const size_t *dim_indexes
)
1333 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1336 /* Only used for tracepoints and system calls for now. */
1338 void register_event(struct lttng_kernel_event_common
*event
)
1340 const struct lttng_kernel_event_desc
*desc
;
1343 WARN_ON_ONCE(event
->priv
->registered
);
1345 desc
= event
->priv
->desc
;
1346 switch (event
->priv
->instrumentation
) {
1347 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1348 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1349 desc
->tp_class
->probe_callback
,
1353 case LTTNG_KERNEL_ABI_SYSCALL
:
1354 ret
= lttng_syscall_filter_enable_event(event
);
1357 case LTTNG_KERNEL_ABI_KPROBE
:
1359 case LTTNG_KERNEL_ABI_UPROBE
:
1363 case LTTNG_KERNEL_ABI_KRETPROBE
:
1364 switch (event
->type
) {
1365 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1368 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1374 case LTTNG_KERNEL_ABI_FUNCTION
:
1376 case LTTNG_KERNEL_ABI_NOOP
:
1383 event
->priv
->registered
= 1;
1387 void unregister_event(struct lttng_kernel_event_common
*event
)
1389 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1390 const struct lttng_kernel_event_desc
*desc
;
1393 WARN_ON_ONCE(!event
->priv
->registered
);
1395 desc
= event_priv
->desc
;
1396 switch (event_priv
->instrumentation
) {
1397 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1398 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1399 event_priv
->desc
->tp_class
->probe_callback
,
1403 case LTTNG_KERNEL_ABI_KPROBE
:
1404 lttng_kprobes_unregister_event(event
);
1408 case LTTNG_KERNEL_ABI_KRETPROBE
:
1409 switch (event
->type
) {
1410 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1411 lttng_kretprobes_unregister(event
);
1414 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1420 case LTTNG_KERNEL_ABI_SYSCALL
:
1421 ret
= lttng_syscall_filter_disable_event(event
);
1424 case LTTNG_KERNEL_ABI_NOOP
:
1425 switch (event
->type
) {
1426 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1429 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1435 case LTTNG_KERNEL_ABI_UPROBE
:
1436 lttng_uprobes_unregister_event(event
);
1440 case LTTNG_KERNEL_ABI_FUNCTION
:
1447 event_priv
->registered
= 0;
1451 void _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1453 if (event
->priv
->registered
)
1454 unregister_event(event
);
1458 * Only used internally at session destruction.
1461 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1463 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1464 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1466 lttng_free_event_filter_runtime(event
);
1467 /* Free event enabler refs */
1468 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1469 &event_priv
->enablers_ref_head
, node
)
1472 switch (event
->type
) {
1473 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1475 struct lttng_kernel_event_recorder
*event_recorder
=
1476 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1478 switch (event_priv
->instrumentation
) {
1479 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1480 lttng_event_desc_put(event_priv
->desc
);
1483 case LTTNG_KERNEL_ABI_KPROBE
:
1484 module_put(event_priv
->desc
->owner
);
1485 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1488 case LTTNG_KERNEL_ABI_KRETPROBE
:
1489 module_put(event_priv
->desc
->owner
);
1490 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1493 case LTTNG_KERNEL_ABI_SYSCALL
:
1496 case LTTNG_KERNEL_ABI_UPROBE
:
1497 module_put(event_priv
->desc
->owner
);
1498 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1501 case LTTNG_KERNEL_ABI_FUNCTION
:
1503 case LTTNG_KERNEL_ABI_NOOP
:
1508 list_del(&event_recorder
->priv
->parent
.node
);
1509 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1510 kmem_cache_free(event_recorder_cache
, event_recorder
);
1513 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1515 struct lttng_kernel_event_notifier
*event_notifier
=
1516 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1518 switch (event_notifier
->priv
->parent
.instrumentation
) {
1519 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1520 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1523 case LTTNG_KERNEL_ABI_KPROBE
:
1524 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1525 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1528 case LTTNG_KERNEL_ABI_SYSCALL
:
1531 case LTTNG_KERNEL_ABI_UPROBE
:
1532 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1533 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1536 case LTTNG_KERNEL_ABI_KRETPROBE
:
1538 case LTTNG_KERNEL_ABI_FUNCTION
:
1540 case LTTNG_KERNEL_ABI_NOOP
:
1545 list_del(&event_notifier
->priv
->parent
.node
);
1546 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1547 kmem_cache_free(event_notifier_cache
, event_notifier
);
1555 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1556 enum tracker_type tracker_type
)
1558 switch (tracker_type
) {
1560 return &session
->pid_tracker
;
1562 return &session
->vpid_tracker
;
1564 return &session
->uid_tracker
;
1566 return &session
->vuid_tracker
;
1568 return &session
->gid_tracker
;
1570 return &session
->vgid_tracker
;
1577 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1578 enum tracker_type tracker_type
, int id
)
1580 struct lttng_kernel_id_tracker
*tracker
;
1583 tracker
= get_tracker(session
, tracker_type
);
1588 mutex_lock(&sessions_mutex
);
1590 /* track all ids: destroy tracker. */
1591 lttng_id_tracker_destroy(tracker
, true);
1594 ret
= lttng_id_tracker_add(tracker
, id
);
1596 mutex_unlock(&sessions_mutex
);
1600 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1601 enum tracker_type tracker_type
, int id
)
1603 struct lttng_kernel_id_tracker
*tracker
;
1606 tracker
= get_tracker(session
, tracker_type
);
1611 mutex_lock(&sessions_mutex
);
1613 /* untrack all ids: replace by empty tracker. */
1614 ret
= lttng_id_tracker_empty_set(tracker
);
1616 ret
= lttng_id_tracker_del(tracker
, id
);
1618 mutex_unlock(&sessions_mutex
);
1623 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1625 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1626 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1627 struct lttng_id_hash_node
*e
;
1630 mutex_lock(&sessions_mutex
);
1632 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1633 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1635 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1641 /* ID tracker disabled. */
1642 if (iter
>= *pos
&& iter
== 0) {
1643 return id_tracker_p
; /* empty tracker */
1651 /* Called with sessions_mutex held. */
1653 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1655 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1656 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1657 struct lttng_id_hash_node
*e
;
1662 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1663 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1665 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1666 if (iter
++ >= *ppos
)
1671 /* ID tracker disabled. */
1672 if (iter
>= *ppos
&& iter
== 0)
1673 return p
; /* empty tracker */
1682 void id_list_stop(struct seq_file
*m
, void *p
)
1684 mutex_unlock(&sessions_mutex
);
1688 int id_list_show(struct seq_file
*m
, void *p
)
1690 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1691 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1694 if (p
== id_tracker_p
) {
1695 /* Tracker disabled. */
1698 const struct lttng_id_hash_node
*e
= p
;
1700 id
= lttng_id_tracker_get_node_id(e
);
1702 switch (id_tracker
->priv
->tracker_type
) {
1704 seq_printf(m
, "process { pid = %d; };\n", id
);
1707 seq_printf(m
, "process { vpid = %d; };\n", id
);
1710 seq_printf(m
, "user { uid = %d; };\n", id
);
1713 seq_printf(m
, "user { vuid = %d; };\n", id
);
1716 seq_printf(m
, "group { gid = %d; };\n", id
);
1719 seq_printf(m
, "group { vgid = %d; };\n", id
);
1722 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1728 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1729 .start
= id_list_start
,
1730 .next
= id_list_next
,
1731 .stop
= id_list_stop
,
1732 .show
= id_list_show
,
1736 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1738 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1742 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1744 struct seq_file
*m
= file
->private_data
;
1745 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1748 WARN_ON_ONCE(!id_tracker
);
1749 ret
= seq_release(inode
, file
);
1751 fput(id_tracker
->priv
->session
->priv
->file
);
1755 const struct file_operations lttng_tracker_ids_list_fops
= {
1756 .owner
= THIS_MODULE
,
1757 .open
= lttng_tracker_ids_list_open
,
1759 .llseek
= seq_lseek
,
1760 .release
= lttng_tracker_ids_list_release
,
1763 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1764 enum tracker_type tracker_type
)
1766 struct file
*tracker_ids_list_file
;
1770 file_fd
= lttng_get_unused_fd();
1776 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1777 <tng_tracker_ids_list_fops
,
1779 if (IS_ERR(tracker_ids_list_file
)) {
1780 ret
= PTR_ERR(tracker_ids_list_file
);
1783 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1785 goto refcount_error
;
1787 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1790 m
= tracker_ids_list_file
->private_data
;
1792 m
->private = get_tracker(session
, tracker_type
);
1793 BUG_ON(!m
->private);
1794 fd_install(file_fd
, tracker_ids_list_file
);
1799 atomic_long_dec(&session
->priv
->file
->f_count
);
1801 fput(tracker_ids_list_file
);
1803 put_unused_fd(file_fd
);
1809 * Enabler management.
1812 int lttng_match_enabler_star_glob(const char *desc_name
,
1813 const char *pattern
)
1815 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1816 desc_name
, LTTNG_SIZE_MAX
))
1822 int lttng_match_enabler_name(const char *desc_name
,
1825 if (strcmp(desc_name
, name
))
1831 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1832 struct lttng_event_enabler_common
*enabler
)
1834 const char *desc_name
, *enabler_name
;
1835 bool compat
= false, entry
= false;
1837 enabler_name
= enabler
->event_param
.name
;
1838 switch (enabler
->event_param
.instrumentation
) {
1839 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1840 desc_name
= desc
->event_name
;
1841 switch (enabler
->format_type
) {
1842 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1843 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1844 case LTTNG_ENABLER_FORMAT_NAME
:
1845 return lttng_match_enabler_name(desc_name
, enabler_name
);
1851 case LTTNG_KERNEL_ABI_SYSCALL
:
1852 desc_name
= desc
->event_name
;
1853 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1854 desc_name
+= strlen("compat_");
1857 if (!strncmp(desc_name
, "syscall_exit_",
1858 strlen("syscall_exit_"))) {
1859 desc_name
+= strlen("syscall_exit_");
1860 } else if (!strncmp(desc_name
, "syscall_entry_",
1861 strlen("syscall_entry_"))) {
1862 desc_name
+= strlen("syscall_entry_");
1868 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1869 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1871 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1875 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1882 switch (enabler
->event_param
.u
.syscall
.abi
) {
1883 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1885 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1889 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1896 switch (enabler
->event_param
.u
.syscall
.match
) {
1897 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1898 switch (enabler
->format_type
) {
1899 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1900 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1901 case LTTNG_ENABLER_FORMAT_NAME
:
1902 return lttng_match_enabler_name(desc_name
, enabler_name
);
1907 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1908 return -EINVAL
; /* Not implemented. */
1920 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1921 struct lttng_event_enabler_common
*enabler
)
1925 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
1933 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
1934 struct lttng_kernel_event_common
*event
)
1936 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1939 switch (event_enabler
->enabler_type
) {
1940 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1942 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1943 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1944 struct lttng_kernel_event_recorder
*event_recorder
=
1945 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1947 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1948 && event_recorder
->chan
== event_recorder_enabler
->chan
)
1953 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1955 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1956 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1957 struct lttng_kernel_event_notifier
*event_notifier
=
1958 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1960 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1961 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1962 && event
->priv
->user_token
== event_enabler
->user_token
)
1973 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
1974 const struct lttng_kernel_event_desc
*desc
,
1975 struct lttng_kernel_event_common
*event
)
1977 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1980 switch (event_enabler
->enabler_type
) {
1981 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1983 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1984 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1985 struct lttng_kernel_event_recorder
*event_recorder
=
1986 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1988 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
1993 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1995 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1996 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1997 struct lttng_kernel_event_notifier
*event_notifier
=
1998 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2000 if (event
->priv
->desc
== desc
2001 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2002 && event
->priv
->user_token
== event_enabler
->user_token
)
2013 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2014 const char *event_name
,
2015 struct lttng_kernel_event_common
*event
)
2017 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2020 switch (event_enabler
->enabler_type
) {
2021 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2023 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2024 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2025 struct lttng_kernel_event_recorder
*event_recorder
=
2026 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2028 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2029 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2034 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2036 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2037 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2038 struct lttng_kernel_event_notifier
*event_notifier
=
2039 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2041 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2042 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2043 && event
->priv
->user_token
== event_enabler
->user_token
)
2055 struct lttng_enabler_ref
*lttng_enabler_ref(
2056 struct list_head
*enablers_ref_list
,
2057 struct lttng_event_enabler_common
*enabler
)
2059 struct lttng_enabler_ref
*enabler_ref
;
2061 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2062 if (enabler_ref
->ref
== enabler
)
2069 void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2071 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2072 struct lttng_kernel_probe_desc
*probe_desc
;
2073 const struct lttng_kernel_event_desc
*desc
;
2074 struct list_head
*probe_list
;
2077 probe_list
= lttng_get_probe_list_head();
2079 * For each probe event, if we find that a probe event matches
2080 * our enabler, create an associated lttng_event if not
2083 list_for_each_entry(probe_desc
, probe_list
, head
) {
2084 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2086 struct hlist_head
*head
;
2087 struct lttng_kernel_event_common
*event
;
2088 struct lttng_kernel_event_common_private
*event_priv
;
2090 desc
= probe_desc
->event_desc
[i
];
2091 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2095 * Check if already created.
2097 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2098 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2099 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
)) {
2108 * We need to create an event for this event probe.
2110 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2111 if (IS_ERR(event
)) {
2112 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2113 probe_desc
->event_desc
[i
]->event_name
);
2120 * Create event if it is missing and present in the list of tracepoint probes.
2121 * Should be called with sessions mutex held.
2124 void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2128 switch (event_enabler
->event_param
.instrumentation
) {
2129 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2130 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler
);
2133 case LTTNG_KERNEL_ABI_SYSCALL
:
2134 ret
= lttng_event_enabler_create_syscall_events_if_missing(event_enabler
);
2145 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2146 struct lttng_kernel_event_common
*event
)
2148 /* Link filter bytecodes if not linked yet. */
2149 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2150 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2154 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2155 struct lttng_kernel_event_common
*event
)
2157 switch (event_enabler
->enabler_type
) {
2158 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2160 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2162 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2163 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2164 struct lttng_kernel_event_notifier
*event_notifier
=
2165 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2167 /* Link capture bytecodes if not linked yet. */
2168 lttng_enabler_link_bytecode(event
->priv
->desc
,
2169 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2170 &event_notifier_enabler
->capture_bytecode_head
);
2171 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2180 * Create events associated with an event_enabler (if not already present),
2181 * and add backward reference from the event to the enabler.
2182 * Should be called with sessions mutex held.
2185 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2187 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2188 struct lttng_kernel_event_common_private
*event_priv
;
2190 lttng_syscall_table_set_wildcard_all(event_enabler
);
2192 /* First ensure that probe events are created for this enabler. */
2193 lttng_event_enabler_create_events_if_missing(event_enabler
);
2195 /* Link the created event with its associated enabler. */
2196 list_for_each_entry(event_priv
, event_list_head
, node
) {
2197 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2198 struct lttng_enabler_ref
*enabler_ref
;
2200 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2203 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2206 * If no backward ref, create it.
2207 * Add backward ref from event_notifier to enabler.
2209 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2213 enabler_ref
->ref
= event_enabler
;
2214 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2217 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2218 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2224 * Called at module load: connect the probe on all enablers matching
2226 * Called with sessions lock held.
2228 int lttng_fix_pending_events(void)
2230 struct lttng_kernel_session_private
*session_priv
;
2232 list_for_each_entry(session_priv
, &sessions
, list
)
2233 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2237 static bool lttng_event_notifier_group_has_active_event_notifiers(
2238 struct lttng_event_notifier_group
*event_notifier_group
)
2240 struct lttng_event_enabler_common
*event_enabler
;
2242 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2243 if (event_enabler
->enabled
)
2249 bool lttng_event_notifier_active(void)
2251 struct lttng_event_notifier_group
*event_notifier_group
;
2253 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2254 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2260 int lttng_fix_pending_event_notifiers(void)
2262 struct lttng_event_notifier_group
*event_notifier_group
;
2264 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2265 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2269 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2270 enum lttng_enabler_format_type format_type
,
2271 struct lttng_kernel_abi_event
*event_param
,
2272 struct lttng_kernel_channel_buffer
*chan
)
2274 struct lttng_event_recorder_enabler
*event_enabler
;
2276 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2279 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2280 event_enabler
->parent
.format_type
= format_type
;
2281 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2282 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2283 sizeof(event_enabler
->parent
.event_param
));
2284 event_enabler
->chan
= chan
;
2286 event_enabler
->parent
.enabled
= 0;
2287 return event_enabler
;
2290 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2291 struct lttng_event_recorder_enabler
*event_enabler
)
2293 mutex_lock(&sessions_mutex
);
2294 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2295 event_enabler
->parent
.published
= true;
2296 lttng_session_lazy_sync_event_enablers(session
);
2297 mutex_unlock(&sessions_mutex
);
2300 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2302 mutex_lock(&sessions_mutex
);
2303 event_enabler
->enabled
= 1;
2304 lttng_event_enabler_sync(event_enabler
);
2305 mutex_unlock(&sessions_mutex
);
2309 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2311 mutex_lock(&sessions_mutex
);
2312 event_enabler
->enabled
= 0;
2313 lttng_event_enabler_sync(event_enabler
);
2314 mutex_unlock(&sessions_mutex
);
2319 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2320 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2322 struct lttng_kernel_bytecode_node
*bytecode_node
;
2323 uint32_t bytecode_len
;
2326 ret
= get_user(bytecode_len
, &bytecode
->len
);
2329 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2333 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2334 sizeof(*bytecode
) + bytecode_len
);
2338 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2339 bytecode_node
->enabler
= enabler
;
2340 /* Enforce length based on allocated size */
2341 bytecode_node
->bc
.len
= bytecode_len
;
2342 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2347 lttng_kvfree(bytecode_node
);
2351 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2352 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2355 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2358 lttng_event_enabler_sync(event_enabler
);
2365 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2366 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2369 switch (event
->priv
->instrumentation
) {
2370 case LTTNG_KERNEL_ABI_UPROBE
:
2371 return lttng_uprobes_event_add_callsite(event
, callsite
);
2378 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2380 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2382 /* Destroy filter bytecode */
2383 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2384 &enabler
->filter_bytecode_head
, node
) {
2385 lttng_kvfree(filter_node
);
2389 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2391 lttng_enabler_destroy(event_enabler
);
2392 if (event_enabler
->published
)
2393 list_del(&event_enabler
->node
);
2395 switch (event_enabler
->enabler_type
) {
2396 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2398 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2399 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2401 kfree(event_recorder_enabler
);
2404 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2406 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2407 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2409 kfree(event_notifier_enabler
);
2417 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2418 enum lttng_enabler_format_type format_type
,
2419 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2420 struct lttng_event_notifier_group
*event_notifier_group
)
2422 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2424 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2425 if (!event_notifier_enabler
)
2428 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2429 event_notifier_enabler
->parent
.format_type
= format_type
;
2430 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2431 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2433 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2434 event_notifier_enabler
->num_captures
= 0;
2436 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2437 sizeof(event_notifier_enabler
->parent
.event_param
));
2439 event_notifier_enabler
->parent
.enabled
= 0;
2440 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2441 event_notifier_enabler
->group
= event_notifier_group
;
2442 return event_notifier_enabler
;
2445 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2446 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2448 mutex_lock(&sessions_mutex
);
2449 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2450 event_notifier_enabler
->parent
.published
= true;
2451 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2452 mutex_unlock(&sessions_mutex
);
2455 int lttng_event_notifier_enabler_enable(
2456 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2458 mutex_lock(&sessions_mutex
);
2459 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2460 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2461 mutex_unlock(&sessions_mutex
);
2465 int lttng_event_notifier_enabler_disable(
2466 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2468 mutex_lock(&sessions_mutex
);
2469 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2470 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2471 mutex_unlock(&sessions_mutex
);
2475 int lttng_event_notifier_enabler_attach_capture_bytecode(
2476 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2477 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2479 struct lttng_kernel_bytecode_node
*bytecode_node
;
2480 struct lttng_event_enabler_common
*enabler
=
2481 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2482 uint32_t bytecode_len
;
2485 ret
= get_user(bytecode_len
, &bytecode
->len
);
2489 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2494 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2495 sizeof(*bytecode
) + bytecode_len
);
2499 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2500 bytecode_node
->enabler
= enabler
;
2502 /* Enforce length based on allocated size */
2503 bytecode_node
->bc
.len
= bytecode_len
;
2504 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2506 event_notifier_enabler
->num_captures
++;
2508 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2512 lttng_kvfree(bytecode_node
);
2518 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2520 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2521 struct lttng_kernel_bytecode_runtime
*runtime
;
2522 struct lttng_enabler_ref
*enabler_ref
;
2524 /* Check if has enablers without bytecode enabled */
2525 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2526 if (enabler_ref
->ref
->enabled
2527 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2528 has_enablers_without_filter_bytecode
= 1;
2532 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2534 /* Enable filters */
2535 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2536 lttng_bytecode_sync_state(runtime
);
2539 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2543 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2545 switch (event
->type
) {
2546 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2548 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2550 struct lttng_kernel_event_notifier
*event_notifier
=
2551 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2552 struct lttng_kernel_bytecode_runtime
*runtime
;
2553 int nr_captures
= 0;
2555 /* Enable captures */
2556 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2557 lttng_bytecode_sync_state(runtime
);
2560 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2569 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2571 struct lttng_enabler_ref
*enabler_ref
;
2572 bool enabled
= false;
2574 switch (event
->priv
->instrumentation
) {
2575 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2577 case LTTNG_KERNEL_ABI_SYSCALL
:
2579 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2580 if (enabler_ref
->ref
->enabled
) {
2591 switch (event
->type
) {
2592 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2594 struct lttng_kernel_event_recorder
*event_recorder
=
2595 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2598 * Enabled state is based on union of enablers, with
2599 * intersection of session and channel transient enable
2602 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2604 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2613 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2615 switch (event
->priv
->instrumentation
) {
2616 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2618 case LTTNG_KERNEL_ABI_SYSCALL
:
2622 /* Not handled with lazy sync. */
2628 * Should be called with sessions mutex held.
2631 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2632 struct list_head
*event_list
)
2634 struct lttng_kernel_event_common_private
*event_priv
;
2635 struct lttng_event_enabler_common
*event_enabler
;
2637 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2638 lttng_event_enabler_ref_events(event_enabler
);
2641 * For each event, if at least one of its enablers is enabled,
2642 * and its channel and session transient states are enabled, we
2643 * enable the event, else we disable it.
2645 list_for_each_entry(event_priv
, event_list
, node
) {
2646 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2649 if (!lttng_event_is_lazy_sync(event
))
2652 enabled
= lttng_get_event_enabled_state(event
);
2653 WRITE_ONCE(event
->enabled
, enabled
);
2655 * Sync tracepoint registration with event enabled state.
2658 if (!event_priv
->registered
)
2659 register_event(event
);
2661 if (event_priv
->registered
)
2662 unregister_event(event
);
2665 lttng_event_sync_filter_state(event
);
2666 lttng_event_sync_capture_state(event
);
2671 * lttng_session_sync_event_enablers should be called just before starting a
2675 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2677 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2681 * Apply enablers to session events, adding events to session if need
2682 * be. It is required after each modification applied to an active
2683 * session, and right before session "start".
2684 * "lazy" sync means we only sync if required.
2685 * Should be called with sessions mutex held.
2688 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2690 /* We can skip if session is not active */
2691 if (!session
->active
)
2693 lttng_session_sync_event_enablers(session
);
2697 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2699 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2703 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2705 switch (event_enabler
->enabler_type
) {
2706 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2708 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2709 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2710 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2713 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2715 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2716 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2717 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2726 * Serialize at most one packet worth of metadata into a metadata
2728 * We grab the metadata cache mutex to get exclusive access to our metadata
2729 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2730 * allows us to do racy operations such as looking for remaining space left in
2731 * packet and write, since mutual exclusion protects us from concurrent writes.
2732 * Mutual exclusion on the metadata cache allow us to read the cache content
2733 * without racing against reallocation of the cache by updates.
2734 * Returns the number of bytes written in the channel, 0 if no data
2735 * was written and a negative value on error.
2737 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2738 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2740 struct lttng_kernel_ring_buffer_ctx ctx
;
2742 size_t len
, reserve_len
;
2745 * Ensure we support mutiple get_next / put sequences followed by
2746 * put_next. The metadata cache lock protects reading the metadata
2747 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2748 * "flush" operations on the buffer invoked by different processes.
2749 * Moreover, since the metadata cache memory can be reallocated, we
2750 * need to have exclusive access against updates even though we only
2753 mutex_lock(&stream
->metadata_cache
->lock
);
2754 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2755 if (stream
->metadata_in
!= stream
->metadata_out
)
2758 /* Metadata regenerated, change the version. */
2759 if (stream
->metadata_cache
->version
!= stream
->version
)
2760 stream
->version
= stream
->metadata_cache
->version
;
2762 len
= stream
->metadata_cache
->metadata_written
-
2763 stream
->metadata_in
;
2766 reserve_len
= min_t(size_t,
2767 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2769 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2770 sizeof(char), NULL
);
2772 * If reservation failed, return an error to the caller.
2774 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2776 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2777 stream
->coherent
= false;
2780 stream
->transport
->ops
.event_write(&ctx
,
2781 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2783 stream
->transport
->ops
.event_commit(&ctx
);
2784 stream
->metadata_in
+= reserve_len
;
2785 if (reserve_len
< len
)
2786 stream
->coherent
= false;
2788 stream
->coherent
= true;
2793 *coherent
= stream
->coherent
;
2794 mutex_unlock(&stream
->metadata_cache
->lock
);
2799 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2801 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2802 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2806 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2808 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2809 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2810 struct lttng_metadata_stream
*stream
;
2812 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2813 wake_up_interruptible(&stream
->read_wait
);
2814 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2819 * Write the metadata to the metadata cache.
2820 * Must be called with sessions_mutex held.
2821 * The metadata cache lock protects us from concurrent read access from
2822 * thread outputting metadata content to ring buffer.
2823 * The content of the printf is printed as a single atomic metadata
2826 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2827 const char *fmt
, ...)
2833 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2836 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2842 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2843 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2844 session
->priv
->metadata_cache
->cache_alloc
) {
2845 char *tmp_cache_realloc
;
2846 unsigned int tmp_cache_alloc_size
;
2848 tmp_cache_alloc_size
= max_t(unsigned int,
2849 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2850 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2851 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2852 if (!tmp_cache_realloc
)
2854 if (session
->priv
->metadata_cache
->data
) {
2855 memcpy(tmp_cache_realloc
,
2856 session
->priv
->metadata_cache
->data
,
2857 session
->priv
->metadata_cache
->cache_alloc
);
2858 vfree(session
->priv
->metadata_cache
->data
);
2861 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2862 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2864 memcpy(session
->priv
->metadata_cache
->data
+
2865 session
->priv
->metadata_cache
->metadata_written
,
2867 session
->priv
->metadata_cache
->metadata_written
+= len
;
2878 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2882 for (i
= 0; i
< nesting
; i
++) {
2885 ret
= lttng_metadata_printf(session
, " ");
2894 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2895 const struct lttng_kernel_event_field
*field
,
2898 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2902 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2903 const struct lttng_kernel_type_integer
*type
,
2904 enum lttng_kernel_string_encoding parent_encoding
,
2909 ret
= print_tabs(session
, nesting
);
2912 ret
= lttng_metadata_printf(session
,
2913 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2917 (parent_encoding
== lttng_kernel_string_encoding_none
)
2919 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
2923 #if __BYTE_ORDER == __BIG_ENDIAN
2924 type
->reverse_byte_order
? " byte_order = le;" : ""
2926 type
->reverse_byte_order
? " byte_order = be;" : ""
2933 * Must be called with sessions_mutex held.
2936 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
2937 const struct lttng_kernel_type_struct
*type
,
2940 const char *prev_field_name
= NULL
;
2942 uint32_t i
, nr_fields
;
2943 unsigned int alignment
;
2945 ret
= print_tabs(session
, nesting
);
2948 ret
= lttng_metadata_printf(session
,
2952 nr_fields
= type
->nr_fields
;
2953 for (i
= 0; i
< nr_fields
; i
++) {
2954 const struct lttng_kernel_event_field
*iter_field
;
2956 iter_field
= type
->fields
[i
];
2957 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
2961 ret
= print_tabs(session
, nesting
);
2964 alignment
= type
->alignment
;
2966 ret
= lttng_metadata_printf(session
,
2970 ret
= lttng_metadata_printf(session
,
2977 * Must be called with sessions_mutex held.
2980 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
2981 const struct lttng_kernel_event_field
*field
,
2986 ret
= _lttng_struct_type_statedump(session
,
2987 lttng_kernel_get_type_struct(field
->type
), nesting
);
2990 return lttng_field_name_statedump(session
, field
, nesting
);
2994 * Must be called with sessions_mutex held.
2997 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
2998 const struct lttng_kernel_type_variant
*type
,
3000 const char *prev_field_name
)
3002 const char *tag_name
;
3004 uint32_t i
, nr_choices
;
3006 tag_name
= type
->tag_name
;
3008 tag_name
= prev_field_name
;
3012 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3014 if (type
->alignment
!= 0)
3016 ret
= print_tabs(session
, nesting
);
3019 ret
= lttng_metadata_printf(session
,
3020 "variant <_%s> {\n",
3024 nr_choices
= type
->nr_choices
;
3025 for (i
= 0; i
< nr_choices
; i
++) {
3026 const struct lttng_kernel_event_field
*iter_field
;
3028 iter_field
= type
->choices
[i
];
3029 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3033 ret
= print_tabs(session
, nesting
);
3036 ret
= lttng_metadata_printf(session
,
3042 * Must be called with sessions_mutex held.
3045 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3046 const struct lttng_kernel_event_field
*field
,
3048 const char *prev_field_name
)
3052 ret
= _lttng_variant_type_statedump(session
,
3053 lttng_kernel_get_type_variant(field
->type
), nesting
,
3057 return lttng_field_name_statedump(session
, field
, nesting
);
3061 * Must be called with sessions_mutex held.
3064 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3065 const struct lttng_kernel_event_field
*field
,
3069 const struct lttng_kernel_type_array
*array_type
;
3070 const struct lttng_kernel_type_common
*elem_type
;
3072 array_type
= lttng_kernel_get_type_array(field
->type
);
3073 WARN_ON_ONCE(!array_type
);
3075 if (array_type
->alignment
) {
3076 ret
= print_tabs(session
, nesting
);
3079 ret
= lttng_metadata_printf(session
,
3080 "struct { } align(%u) _%s_padding;\n",
3081 array_type
->alignment
* CHAR_BIT
,
3087 * Nested compound types: Only array of structures and variants are
3088 * currently supported.
3090 elem_type
= array_type
->elem_type
;
3091 switch (elem_type
->type
) {
3092 case lttng_kernel_type_integer
:
3093 case lttng_kernel_type_struct
:
3094 case lttng_kernel_type_variant
:
3095 ret
= _lttng_type_statedump(session
, elem_type
,
3096 array_type
->encoding
, nesting
);
3104 ret
= lttng_metadata_printf(session
,
3107 array_type
->length
);
3112 * Must be called with sessions_mutex held.
3115 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3116 const struct lttng_kernel_event_field
*field
,
3118 const char *prev_field_name
)
3121 const char *length_name
;
3122 const struct lttng_kernel_type_sequence
*sequence_type
;
3123 const struct lttng_kernel_type_common
*elem_type
;
3125 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3126 WARN_ON_ONCE(!sequence_type
);
3128 length_name
= sequence_type
->length_name
;
3130 length_name
= prev_field_name
;
3134 if (sequence_type
->alignment
) {
3135 ret
= print_tabs(session
, nesting
);
3138 ret
= lttng_metadata_printf(session
,
3139 "struct { } align(%u) _%s_padding;\n",
3140 sequence_type
->alignment
* CHAR_BIT
,
3147 * Nested compound types: Only array of structures and variants are
3148 * currently supported.
3150 elem_type
= sequence_type
->elem_type
;
3151 switch (elem_type
->type
) {
3152 case lttng_kernel_type_integer
:
3153 case lttng_kernel_type_struct
:
3154 case lttng_kernel_type_variant
:
3155 ret
= _lttng_type_statedump(session
, elem_type
,
3156 sequence_type
->encoding
, nesting
);
3164 ret
= lttng_metadata_printf(session
,
3172 * Must be called with sessions_mutex held.
3175 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3176 const struct lttng_kernel_type_enum
*type
,
3179 const struct lttng_kernel_enum_desc
*enum_desc
;
3180 const struct lttng_kernel_type_common
*container_type
;
3182 unsigned int i
, nr_entries
;
3184 container_type
= type
->container_type
;
3185 if (container_type
->type
!= lttng_kernel_type_integer
) {
3189 enum_desc
= type
->desc
;
3190 nr_entries
= enum_desc
->nr_entries
;
3192 ret
= print_tabs(session
, nesting
);
3195 ret
= lttng_metadata_printf(session
, "enum : ");
3198 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3199 lttng_kernel_string_encoding_none
, 0);
3202 ret
= lttng_metadata_printf(session
, " {\n");
3205 /* Dump all entries */
3206 for (i
= 0; i
< nr_entries
; i
++) {
3207 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3210 ret
= print_tabs(session
, nesting
+ 1);
3213 ret
= lttng_metadata_printf(session
,
3217 len
= strlen(entry
->string
);
3218 /* Escape the character '"' */
3219 for (j
= 0; j
< len
; j
++) {
3220 char c
= entry
->string
[j
];
3224 ret
= lttng_metadata_printf(session
,
3228 ret
= lttng_metadata_printf(session
,
3232 ret
= lttng_metadata_printf(session
,
3239 ret
= lttng_metadata_printf(session
, "\"");
3243 if (entry
->options
.is_auto
) {
3244 ret
= lttng_metadata_printf(session
, ",\n");
3248 ret
= lttng_metadata_printf(session
,
3252 if (entry
->start
.signedness
)
3253 ret
= lttng_metadata_printf(session
,
3254 "%lld", (long long) entry
->start
.value
);
3256 ret
= lttng_metadata_printf(session
,
3257 "%llu", entry
->start
.value
);
3260 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3262 == entry
->end
.value
) {
3263 ret
= lttng_metadata_printf(session
,
3266 if (entry
->end
.signedness
) {
3267 ret
= lttng_metadata_printf(session
,
3269 (long long) entry
->end
.value
);
3271 ret
= lttng_metadata_printf(session
,
3280 ret
= print_tabs(session
, nesting
);
3283 ret
= lttng_metadata_printf(session
, "}");
3289 * Must be called with sessions_mutex held.
3292 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3293 const struct lttng_kernel_event_field
*field
,
3297 const struct lttng_kernel_type_enum
*enum_type
;
3299 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3300 WARN_ON_ONCE(!enum_type
);
3301 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3304 return lttng_field_name_statedump(session
, field
, nesting
);
3308 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3309 const struct lttng_kernel_event_field
*field
,
3314 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3315 lttng_kernel_string_encoding_none
, nesting
);
3318 return lttng_field_name_statedump(session
, field
, nesting
);
3322 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3323 const struct lttng_kernel_type_string
*type
,
3328 /* Default encoding is UTF8 */
3329 ret
= print_tabs(session
, nesting
);
3332 ret
= lttng_metadata_printf(session
,
3334 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3335 " { encoding = ASCII; }" : "");
3340 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3341 const struct lttng_kernel_event_field
*field
,
3344 const struct lttng_kernel_type_string
*string_type
;
3347 string_type
= lttng_kernel_get_type_string(field
->type
);
3348 WARN_ON_ONCE(!string_type
);
3349 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3352 return lttng_field_name_statedump(session
, field
, nesting
);
3356 * Must be called with sessions_mutex held.
3359 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3360 const struct lttng_kernel_type_common
*type
,
3361 enum lttng_kernel_string_encoding parent_encoding
,
3366 switch (type
->type
) {
3367 case lttng_kernel_type_integer
:
3368 ret
= _lttng_integer_type_statedump(session
,
3369 lttng_kernel_get_type_integer(type
),
3370 parent_encoding
, nesting
);
3372 case lttng_kernel_type_enum
:
3373 ret
= _lttng_enum_type_statedump(session
,
3374 lttng_kernel_get_type_enum(type
),
3377 case lttng_kernel_type_string
:
3378 ret
= _lttng_string_type_statedump(session
,
3379 lttng_kernel_get_type_string(type
),
3382 case lttng_kernel_type_struct
:
3383 ret
= _lttng_struct_type_statedump(session
,
3384 lttng_kernel_get_type_struct(type
),
3387 case lttng_kernel_type_variant
:
3388 ret
= _lttng_variant_type_statedump(session
,
3389 lttng_kernel_get_type_variant(type
),
3393 /* Nested arrays and sequences are not supported yet. */
3394 case lttng_kernel_type_array
:
3395 case lttng_kernel_type_sequence
:
3404 * Must be called with sessions_mutex held.
3407 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3408 const struct lttng_kernel_event_field
*field
,
3410 const char **prev_field_name_p
)
3412 const char *prev_field_name
= NULL
;
3415 if (prev_field_name_p
)
3416 prev_field_name
= *prev_field_name_p
;
3417 switch (field
->type
->type
) {
3418 case lttng_kernel_type_integer
:
3419 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3421 case lttng_kernel_type_enum
:
3422 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3424 case lttng_kernel_type_string
:
3425 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3427 case lttng_kernel_type_struct
:
3428 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3430 case lttng_kernel_type_array
:
3431 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3433 case lttng_kernel_type_sequence
:
3434 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3436 case lttng_kernel_type_variant
:
3437 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3444 if (prev_field_name_p
)
3445 *prev_field_name_p
= field
->name
;
3450 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3451 struct lttng_kernel_ctx
*ctx
)
3453 const char *prev_field_name
= NULL
;
3459 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3460 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3462 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3470 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3471 struct lttng_kernel_event_recorder
*event_recorder
)
3473 const char *prev_field_name
= NULL
;
3474 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3478 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3479 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3481 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3489 * Must be called with sessions_mutex held.
3490 * The entire event metadata is printed as a single atomic metadata
3494 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3496 struct lttng_kernel_event_recorder
*event_recorder
;
3497 struct lttng_kernel_channel_buffer
*chan
;
3498 struct lttng_kernel_session
*session
;
3501 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3503 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3504 chan
= event_recorder
->chan
;
3505 session
= chan
->parent
.session
;
3507 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3509 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3512 lttng_metadata_begin(session
);
3514 ret
= lttng_metadata_printf(session
,
3518 " stream_id = %u;\n",
3519 event_recorder
->priv
->parent
.desc
->event_name
,
3520 event_recorder
->priv
->id
,
3521 event_recorder
->chan
->priv
->id
);
3525 ret
= lttng_metadata_printf(session
,
3526 " fields := struct {\n"
3531 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3536 * LTTng space reservation can only reserve multiples of the
3539 ret
= lttng_metadata_printf(session
,
3545 event_recorder
->priv
->metadata_dumped
= 1;
3547 lttng_metadata_end(session
);
3553 * Must be called with sessions_mutex held.
3554 * The entire channel metadata is printed as a single atomic metadata
3558 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3559 struct lttng_kernel_channel_buffer
*chan
)
3563 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3566 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3569 lttng_metadata_begin(session
);
3571 WARN_ON_ONCE(!chan
->priv
->header_type
);
3572 ret
= lttng_metadata_printf(session
,
3575 " event.header := %s;\n"
3576 " packet.context := struct packet_context;\n",
3578 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3579 "struct event_header_large");
3583 if (chan
->priv
->ctx
) {
3584 ret
= lttng_metadata_printf(session
,
3585 " event.context := struct {\n");
3589 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3592 if (chan
->priv
->ctx
) {
3593 ret
= lttng_metadata_printf(session
,
3599 ret
= lttng_metadata_printf(session
,
3602 chan
->priv
->metadata_dumped
= 1;
3604 lttng_metadata_end(session
);
3609 * Must be called with sessions_mutex held.
3612 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3614 return lttng_metadata_printf(session
,
3615 "struct packet_context {\n"
3616 " uint64_clock_monotonic_t timestamp_begin;\n"
3617 " uint64_clock_monotonic_t timestamp_end;\n"
3618 " uint64_t content_size;\n"
3619 " uint64_t packet_size;\n"
3620 " uint64_t packet_seq_num;\n"
3621 " unsigned long events_discarded;\n"
3622 " uint32_t cpu_id;\n"
3629 * id: range: 0 - 30.
3630 * id 31 is reserved to indicate an extended header.
3633 * id: range: 0 - 65534.
3634 * id 65535 is reserved to indicate an extended header.
3636 * Must be called with sessions_mutex held.
3639 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3641 return lttng_metadata_printf(session
,
3642 "struct event_header_compact {\n"
3643 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3646 " uint27_clock_monotonic_t timestamp;\n"
3650 " uint64_clock_monotonic_t timestamp;\n"
3655 "struct event_header_large {\n"
3656 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3659 " uint32_clock_monotonic_t timestamp;\n"
3663 " uint64_clock_monotonic_t timestamp;\n"
3667 lttng_alignof(uint32_t) * CHAR_BIT
,
3668 lttng_alignof(uint16_t) * CHAR_BIT
3673 * Approximation of NTP time of day to clock monotonic correlation,
3674 * taken at start of trace.
3675 * Yes, this is only an approximation. Yes, we can (and will) do better
3676 * in future versions.
3677 * This function may return a negative offset. It may happen if the
3678 * system sets the REALTIME clock to 0 after boot.
3680 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3684 int64_t measure_clock_offset(void)
3686 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3687 uint64_t tcf
= trace_clock_freq();
3689 unsigned long flags
;
3690 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3691 struct timespec64 rts
= { 0, 0 };
3693 struct timespec rts
= { 0, 0 };
3696 /* Disable interrupts to increase correlation precision. */
3697 local_irq_save(flags
);
3698 monotonic
[0] = trace_clock_read64();
3699 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3700 ktime_get_real_ts64(&rts
);
3702 getnstimeofday(&rts
);
3704 monotonic
[1] = trace_clock_read64();
3705 local_irq_restore(flags
);
3707 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3708 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3709 if (tcf
== NSEC_PER_SEC
) {
3710 realtime
+= rts
.tv_nsec
;
3712 uint64_t n
= rts
.tv_nsec
* tcf
;
3714 do_div(n
, NSEC_PER_SEC
);
3717 offset
= (int64_t) realtime
- monotonic_avg
;
3722 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3730 while (cur
!= '\0') {
3733 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3737 ret
= lttng_metadata_printf(session
, "%c", '\\');
3740 /* We still print the current char */
3743 ret
= lttng_metadata_printf(session
, "%c", cur
);
3757 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3758 const char *field_value
)
3762 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3766 ret
= print_escaped_ctf_string(session
, field_value
);
3770 ret
= lttng_metadata_printf(session
, "\";\n");
3777 * Output metadata into this session's metadata buffers.
3778 * Must be called with sessions_mutex held.
3781 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3783 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3784 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3785 const char *product_uuid
;
3786 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3787 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3790 if (!LTTNG_READ_ONCE(session
->active
))
3793 lttng_metadata_begin(session
);
3795 if (session
->priv
->metadata_dumped
)
3798 snprintf(uuid_s
, sizeof(uuid_s
),
3799 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3800 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3801 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3802 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3803 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3805 ret
= lttng_metadata_printf(session
,
3806 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3807 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3808 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3809 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3810 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3811 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3812 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3818 " byte_order = %s;\n"
3819 " packet.header := struct {\n"
3820 " uint32_t magic;\n"
3821 " uint8_t uuid[16];\n"
3822 " uint32_t stream_id;\n"
3823 " uint64_t stream_instance_id;\n"
3826 lttng_alignof(uint8_t) * CHAR_BIT
,
3827 lttng_alignof(uint16_t) * CHAR_BIT
,
3828 lttng_alignof(uint32_t) * CHAR_BIT
,
3829 lttng_alignof(uint64_t) * CHAR_BIT
,
3830 sizeof(unsigned long) * CHAR_BIT
,
3831 lttng_alignof(unsigned long) * CHAR_BIT
,
3835 #if __BYTE_ORDER == __BIG_ENDIAN
3844 ret
= lttng_metadata_printf(session
,
3846 " hostname = \"%s\";\n"
3847 " domain = \"kernel\";\n"
3848 " sysname = \"%s\";\n"
3849 " kernel_release = \"%s\";\n"
3850 " kernel_version = \"%s\";\n"
3851 " tracer_name = \"lttng-modules\";\n"
3852 " tracer_major = %d;\n"
3853 " tracer_minor = %d;\n"
3854 " tracer_patchlevel = %d;\n"
3855 " trace_buffering_scheme = \"global\";\n",
3856 current
->nsproxy
->uts_ns
->name
.nodename
,
3860 LTTNG_MODULES_MAJOR_VERSION
,
3861 LTTNG_MODULES_MINOR_VERSION
,
3862 LTTNG_MODULES_PATCHLEVEL_VERSION
3867 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3870 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3871 session
->priv
->creation_time
);
3875 /* Add the product UUID to the 'env' section */
3876 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3878 ret
= lttng_metadata_printf(session
,
3879 " product_uuid = \"%s\";\n",
3886 /* Close the 'env' section */
3887 ret
= lttng_metadata_printf(session
, "};\n\n");
3891 ret
= lttng_metadata_printf(session
,
3893 " name = \"%s\";\n",
3899 if (!trace_clock_uuid(clock_uuid_s
)) {
3900 ret
= lttng_metadata_printf(session
,
3901 " uuid = \"%s\";\n",
3908 ret
= lttng_metadata_printf(session
,
3909 " description = \"%s\";\n"
3910 " freq = %llu; /* Frequency, in Hz */\n"
3911 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3914 trace_clock_description(),
3915 (unsigned long long) trace_clock_freq(),
3916 (long long) measure_clock_offset()
3921 ret
= lttng_metadata_printf(session
,
3922 "typealias integer {\n"
3923 " size = 27; align = 1; signed = false;\n"
3924 " map = clock.%s.value;\n"
3925 "} := uint27_clock_monotonic_t;\n"
3927 "typealias integer {\n"
3928 " size = 32; align = %u; signed = false;\n"
3929 " map = clock.%s.value;\n"
3930 "} := uint32_clock_monotonic_t;\n"
3932 "typealias integer {\n"
3933 " size = 64; align = %u; signed = false;\n"
3934 " map = clock.%s.value;\n"
3935 "} := uint64_clock_monotonic_t;\n\n",
3937 lttng_alignof(uint32_t) * CHAR_BIT
,
3939 lttng_alignof(uint64_t) * CHAR_BIT
,
3945 ret
= _lttng_stream_packet_context_declare(session
);
3949 ret
= _lttng_event_header_declare(session
);
3954 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
3955 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
3960 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
3961 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
3965 session
->priv
->metadata_dumped
= 1;
3967 lttng_metadata_end(session
);
3972 * lttng_transport_register - LTT transport registration
3973 * @transport: transport structure
3975 * Registers a transport which can be used as output to extract the data out of
3976 * LTTng. The module calling this registration function must ensure that no
3977 * trap-inducing code will be executed by the transport functions. E.g.
3978 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3979 * is made visible to the transport function. This registration acts as a
3980 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3981 * after its registration must it synchronize the TLBs.
3983 void lttng_transport_register(struct lttng_transport
*transport
)
3986 * Make sure no page fault can be triggered by the module about to be
3987 * registered. We deal with this here so we don't have to call
3988 * vmalloc_sync_mappings() in each module's init.
3990 wrapper_vmalloc_sync_mappings();
3992 mutex_lock(&sessions_mutex
);
3993 list_add_tail(&transport
->node
, <tng_transport_list
);
3994 mutex_unlock(&sessions_mutex
);
3996 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3999 * lttng_transport_unregister - LTT transport unregistration
4000 * @transport: transport structure
4002 void lttng_transport_unregister(struct lttng_transport
*transport
)
4004 mutex_lock(&sessions_mutex
);
4005 list_del(&transport
->node
);
4006 mutex_unlock(&sessions_mutex
);
4008 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4010 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4013 * Make sure no page fault can be triggered by the module about to be
4014 * registered. We deal with this here so we don't have to call
4015 * vmalloc_sync_mappings() in each module's init.
4017 wrapper_vmalloc_sync_mappings();
4019 mutex_lock(&sessions_mutex
);
4020 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4021 mutex_unlock(&sessions_mutex
);
4023 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4025 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4027 mutex_lock(&sessions_mutex
);
4028 list_del(&transport
->node
);
4029 mutex_unlock(&sessions_mutex
);
4031 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4033 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4035 enum cpuhp_state lttng_hp_prepare
;
4036 enum cpuhp_state lttng_hp_online
;
4038 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4040 struct lttng_cpuhp_node
*lttng_node
;
4042 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4043 switch (lttng_node
->component
) {
4044 case LTTNG_RING_BUFFER_FRONTEND
:
4046 case LTTNG_RING_BUFFER_BACKEND
:
4047 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4048 case LTTNG_RING_BUFFER_ITER
:
4050 case LTTNG_CONTEXT_PERF_COUNTERS
:
4057 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4059 struct lttng_cpuhp_node
*lttng_node
;
4061 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4062 switch (lttng_node
->component
) {
4063 case LTTNG_RING_BUFFER_FRONTEND
:
4064 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4065 case LTTNG_RING_BUFFER_BACKEND
:
4067 case LTTNG_RING_BUFFER_ITER
:
4069 case LTTNG_CONTEXT_PERF_COUNTERS
:
4070 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4076 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4078 struct lttng_cpuhp_node
*lttng_node
;
4080 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4081 switch (lttng_node
->component
) {
4082 case LTTNG_RING_BUFFER_FRONTEND
:
4083 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4084 case LTTNG_RING_BUFFER_BACKEND
:
4086 case LTTNG_RING_BUFFER_ITER
:
4087 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4088 case LTTNG_CONTEXT_PERF_COUNTERS
:
4089 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4095 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4097 struct lttng_cpuhp_node
*lttng_node
;
4099 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4100 switch (lttng_node
->component
) {
4101 case LTTNG_RING_BUFFER_FRONTEND
:
4102 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4103 case LTTNG_RING_BUFFER_BACKEND
:
4105 case LTTNG_RING_BUFFER_ITER
:
4107 case LTTNG_CONTEXT_PERF_COUNTERS
:
4114 static int __init
lttng_init_cpu_hotplug(void)
4118 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4119 lttng_hotplug_prepare
,
4120 lttng_hotplug_dead
);
4124 lttng_hp_prepare
= ret
;
4125 lttng_rb_set_hp_prepare(ret
);
4127 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4128 lttng_hotplug_online
,
4129 lttng_hotplug_offline
);
4131 cpuhp_remove_multi_state(lttng_hp_prepare
);
4132 lttng_hp_prepare
= 0;
4135 lttng_hp_online
= ret
;
4136 lttng_rb_set_hp_online(ret
);
4141 static void __exit
lttng_exit_cpu_hotplug(void)
4143 lttng_rb_set_hp_online(0);
4144 cpuhp_remove_multi_state(lttng_hp_online
);
4145 lttng_rb_set_hp_prepare(0);
4146 cpuhp_remove_multi_state(lttng_hp_prepare
);
4149 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4150 static int lttng_init_cpu_hotplug(void)
4154 static void lttng_exit_cpu_hotplug(void)
4157 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4159 static int __init
lttng_events_init(void)
4163 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4166 ret
= wrapper_get_pfnblock_flags_mask_init();
4169 ret
= wrapper_get_pageblock_flags_mask_init();
4172 ret
= lttng_probes_init();
4175 ret
= lttng_context_init();
4178 ret
= lttng_tracepoint_init();
4181 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4182 if (!event_recorder_cache
) {
4184 goto error_kmem_event_recorder
;
4186 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4187 if (!event_recorder_private_cache
) {
4189 goto error_kmem_event_recorder_private
;
4191 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4192 if (!event_notifier_cache
) {
4194 goto error_kmem_event_notifier
;
4196 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4197 if (!event_notifier_private_cache
) {
4199 goto error_kmem_event_notifier_private
;
4201 ret
= lttng_abi_init();
4204 ret
= lttng_logger_init();
4207 ret
= lttng_init_cpu_hotplug();
4210 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4211 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4212 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4213 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4214 LTTNG_MODULES_EXTRAVERSION
,
4216 #ifdef LTTNG_EXTRA_VERSION_GIT
4217 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4221 #ifdef LTTNG_EXTRA_VERSION_NAME
4222 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4226 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4227 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4228 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4232 lttng_logger_exit();
4236 kmem_cache_destroy(event_notifier_private_cache
);
4237 error_kmem_event_notifier_private
:
4238 kmem_cache_destroy(event_notifier_cache
);
4239 error_kmem_event_notifier
:
4240 kmem_cache_destroy(event_recorder_private_cache
);
4241 error_kmem_event_recorder_private
:
4242 kmem_cache_destroy(event_recorder_cache
);
4243 error_kmem_event_recorder
:
4244 lttng_tracepoint_exit();
4246 lttng_context_exit();
4247 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4248 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4249 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4250 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4251 LTTNG_MODULES_EXTRAVERSION
,
4253 #ifdef LTTNG_EXTRA_VERSION_GIT
4254 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4258 #ifdef LTTNG_EXTRA_VERSION_NAME
4259 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4266 module_init(lttng_events_init
);
4268 static void __exit
lttng_events_exit(void)
4270 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4272 lttng_exit_cpu_hotplug();
4273 lttng_logger_exit();
4275 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4276 lttng_session_destroy(session_priv
->pub
);
4277 kmem_cache_destroy(event_recorder_cache
);
4278 kmem_cache_destroy(event_recorder_private_cache
);
4279 kmem_cache_destroy(event_notifier_cache
);
4280 kmem_cache_destroy(event_notifier_private_cache
);
4281 lttng_tracepoint_exit();
4282 lttng_context_exit();
4283 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4284 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4285 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4286 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4287 LTTNG_MODULES_EXTRAVERSION
,
4289 #ifdef LTTNG_EXTRA_VERSION_GIT
4290 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4294 #ifdef LTTNG_EXTRA_VERSION_NAME
4295 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4301 module_exit(lttng_events_exit
);
4303 #include <generated/patches.h>
4304 #ifdef LTTNG_EXTRA_VERSION_GIT
4305 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4307 #ifdef LTTNG_EXTRA_VERSION_NAME
4308 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4310 MODULE_LICENSE("GPL and additional rights");
4311 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4312 MODULE_DESCRIPTION("LTTng tracer");
4313 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4314 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4315 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4316 LTTNG_MODULES_EXTRAVERSION
);