1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.h>
40 #include <lttng/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.h>
50 #include <wrapper/time.h>
52 #define METADATA_CACHE_DEFAULT_SIZE 4096
54 static LIST_HEAD(sessions
);
55 static LIST_HEAD(event_notifier_groups
);
56 static LIST_HEAD(lttng_transport_list
);
57 static LIST_HEAD(lttng_counter_transport_list
);
59 * Protect the sessions and metadata caches.
61 static DEFINE_MUTEX(sessions_mutex
);
62 static struct kmem_cache
*event_recorder_cache
;
63 static struct kmem_cache
*event_recorder_private_cache
;
64 static struct kmem_cache
*event_notifier_cache
;
65 static struct kmem_cache
*event_notifier_private_cache
;
67 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
68 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
69 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
70 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
76 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
77 struct lttng_kernel_channel_buffer
*chan
,
78 struct lttng_kernel_event_recorder
*event
);
80 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
82 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
84 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
85 const struct lttng_kernel_type_common
*type
,
86 enum lttng_kernel_string_encoding parent_encoding
,
89 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
90 const struct lttng_kernel_event_field
*field
,
91 size_t nesting
, const char **prev_field_name_p
);
93 void synchronize_trace(void)
95 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
96 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
102 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
103 #ifdef CONFIG_PREEMPT_RT_FULL
106 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
107 #ifdef CONFIG_PREEMPT_RT
110 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
113 void lttng_lock_sessions(void)
115 mutex_lock(&sessions_mutex
);
118 void lttng_unlock_sessions(void)
120 mutex_unlock(&sessions_mutex
);
123 static struct lttng_transport
*lttng_transport_find(const char *name
)
125 struct lttng_transport
*transport
;
127 list_for_each_entry(transport
, <tng_transport_list
, node
) {
128 if (!strcmp(transport
->name
, name
))
135 * Called with sessions lock held.
137 int lttng_session_active(void)
139 struct lttng_kernel_session_private
*iter
;
141 list_for_each_entry(iter
, &sessions
, list
) {
142 if (iter
->pub
->active
)
148 struct lttng_kernel_session
*lttng_session_create(void)
150 struct lttng_kernel_session
*session
;
151 struct lttng_kernel_session_private
*session_priv
;
152 struct lttng_metadata_cache
*metadata_cache
;
155 mutex_lock(&sessions_mutex
);
156 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
159 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
161 goto err_free_session
;
162 session
->priv
= session_priv
;
163 session_priv
->pub
= session
;
165 INIT_LIST_HEAD(&session_priv
->chan
);
166 INIT_LIST_HEAD(&session_priv
->events
);
167 lttng_guid_gen(&session_priv
->uuid
);
169 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
172 goto err_free_session_private
;
173 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
174 if (!metadata_cache
->data
)
176 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
177 kref_init(&metadata_cache
->refcount
);
178 mutex_init(&metadata_cache
->lock
);
179 session_priv
->metadata_cache
= metadata_cache
;
180 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
181 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
182 sizeof(metadata_cache
->uuid
));
183 INIT_LIST_HEAD(&session_priv
->enablers_head
);
184 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
185 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
186 list_add(&session_priv
->list
, &sessions
);
188 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
189 goto tracker_alloc_error
;
190 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
195 goto tracker_alloc_error
;
196 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
197 goto tracker_alloc_error
;
198 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
199 goto tracker_alloc_error
;
201 mutex_unlock(&sessions_mutex
);
206 lttng_id_tracker_fini(&session
->pid_tracker
);
207 lttng_id_tracker_fini(&session
->vpid_tracker
);
208 lttng_id_tracker_fini(&session
->uid_tracker
);
209 lttng_id_tracker_fini(&session
->vuid_tracker
);
210 lttng_id_tracker_fini(&session
->gid_tracker
);
211 lttng_id_tracker_fini(&session
->vgid_tracker
);
213 kfree(metadata_cache
);
214 err_free_session_private
:
215 lttng_kvfree(session_priv
);
217 lttng_kvfree(session
);
219 mutex_unlock(&sessions_mutex
);
224 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
226 struct lttng_counter_transport
*transport
;
228 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
229 if (!strcmp(transport
->name
, name
))
235 struct lttng_counter
*lttng_kernel_counter_create(
236 const char *counter_transport_name
,
237 size_t number_dimensions
, const size_t *dimensions_sizes
)
239 struct lttng_counter
*counter
= NULL
;
240 struct lttng_counter_transport
*counter_transport
= NULL
;
242 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
243 if (!counter_transport
) {
244 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
245 counter_transport_name
);
248 if (!try_module_get(counter_transport
->owner
)) {
249 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
253 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
257 /* Create event notifier error counter. */
258 counter
->ops
= &counter_transport
->ops
;
259 counter
->transport
= counter_transport
;
261 counter
->counter
= counter
->ops
->counter_create(
262 number_dimensions
, dimensions_sizes
, 0);
263 if (!counter
->counter
) {
270 lttng_kvfree(counter
);
272 if (counter_transport
)
273 module_put(counter_transport
->owner
);
278 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
280 struct lttng_transport
*transport
= NULL
;
281 struct lttng_event_notifier_group
*event_notifier_group
;
282 const char *transport_name
= "relay-event-notifier";
283 size_t subbuf_size
= 4096; //TODO
284 size_t num_subbuf
= 16; //TODO
285 unsigned int switch_timer_interval
= 0;
286 unsigned int read_timer_interval
= 0;
289 mutex_lock(&sessions_mutex
);
291 transport
= lttng_transport_find(transport_name
);
293 printk(KERN_WARNING
"LTTng: transport %s not found\n",
297 if (!try_module_get(transport
->owner
)) {
298 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
303 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
305 if (!event_notifier_group
)
309 * Initialize the ring buffer used to store event notifier
312 event_notifier_group
->ops
= &transport
->ops
;
313 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
314 transport_name
, event_notifier_group
, NULL
,
315 subbuf_size
, num_subbuf
, switch_timer_interval
,
316 read_timer_interval
);
317 if (!event_notifier_group
->chan
)
320 event_notifier_group
->transport
= transport
;
322 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
323 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
324 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
325 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
327 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
329 mutex_unlock(&sessions_mutex
);
331 return event_notifier_group
;
334 lttng_kvfree(event_notifier_group
);
337 module_put(transport
->owner
);
339 mutex_unlock(&sessions_mutex
);
343 void metadata_cache_destroy(struct kref
*kref
)
345 struct lttng_metadata_cache
*cache
=
346 container_of(kref
, struct lttng_metadata_cache
, refcount
);
351 void lttng_session_destroy(struct lttng_kernel_session
*session
)
353 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
354 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
355 struct lttng_metadata_stream
*metadata_stream
;
356 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
359 mutex_lock(&sessions_mutex
);
360 WRITE_ONCE(session
->active
, 0);
361 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
362 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
365 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
366 ret
= _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
369 synchronize_trace(); /* Wait for in-flight events to complete */
370 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
371 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
374 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
375 lttng_event_enabler_destroy(event_enabler
);
376 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
377 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
378 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
379 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
380 _lttng_channel_destroy(chan_priv
->pub
);
382 mutex_lock(&session
->priv
->metadata_cache
->lock
);
383 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
384 _lttng_metadata_channel_hangup(metadata_stream
);
385 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
386 lttng_id_tracker_fini(&session
->pid_tracker
);
387 lttng_id_tracker_fini(&session
->vpid_tracker
);
388 lttng_id_tracker_fini(&session
->uid_tracker
);
389 lttng_id_tracker_fini(&session
->vuid_tracker
);
390 lttng_id_tracker_fini(&session
->gid_tracker
);
391 lttng_id_tracker_fini(&session
->vgid_tracker
);
392 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
393 list_del(&session
->priv
->list
);
394 mutex_unlock(&sessions_mutex
);
395 lttng_kvfree(session
->priv
);
396 lttng_kvfree(session
);
399 void lttng_event_notifier_group_destroy(
400 struct lttng_event_notifier_group
*event_notifier_group
)
402 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
403 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
406 if (!event_notifier_group
)
409 mutex_lock(&sessions_mutex
);
411 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
414 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
415 &event_notifier_group
->event_notifiers_head
, parent
.node
) {
416 ret
= _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
420 /* Wait for in-flight event notifier to complete */
423 irq_work_sync(&event_notifier_group
->wakeup_pending
);
425 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
428 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
429 &event_notifier_group
->enablers_head
, node
)
430 lttng_event_enabler_destroy(event_enabler
);
432 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
433 &event_notifier_group
->event_notifiers_head
, parent
.node
)
434 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
436 if (event_notifier_group
->error_counter
) {
437 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
439 error_counter
->ops
->counter_destroy(error_counter
->counter
);
440 module_put(error_counter
->transport
->owner
);
441 lttng_kvfree(error_counter
);
442 event_notifier_group
->error_counter
= NULL
;
445 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
446 module_put(event_notifier_group
->transport
->owner
);
447 list_del(&event_notifier_group
->node
);
449 mutex_unlock(&sessions_mutex
);
450 lttng_kvfree(event_notifier_group
);
453 int lttng_session_statedump(struct lttng_kernel_session
*session
)
457 mutex_lock(&sessions_mutex
);
458 ret
= lttng_statedump_start(session
);
459 mutex_unlock(&sessions_mutex
);
463 int lttng_session_enable(struct lttng_kernel_session
*session
)
466 struct lttng_kernel_channel_buffer_private
*chan_priv
;
468 mutex_lock(&sessions_mutex
);
469 if (session
->active
) {
474 /* Set transient enabler state to "enabled" */
475 session
->priv
->tstate
= 1;
477 /* We need to sync enablers with session before activation. */
478 lttng_session_sync_event_enablers(session
);
481 * Snapshot the number of events per channel to know the type of header
484 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
485 if (chan_priv
->header_type
)
486 continue; /* don't change it if session stop/restart */
487 if (chan_priv
->free_event_id
< 31)
488 chan_priv
->header_type
= 1; /* compact */
490 chan_priv
->header_type
= 2; /* large */
493 /* Clear each stream's quiescent state. */
494 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
495 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
496 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
499 WRITE_ONCE(session
->active
, 1);
500 WRITE_ONCE(session
->priv
->been_active
, 1);
501 ret
= _lttng_session_metadata_statedump(session
);
503 WRITE_ONCE(session
->active
, 0);
506 ret
= lttng_statedump_start(session
);
508 WRITE_ONCE(session
->active
, 0);
510 mutex_unlock(&sessions_mutex
);
514 int lttng_session_disable(struct lttng_kernel_session
*session
)
517 struct lttng_kernel_channel_buffer_private
*chan_priv
;
519 mutex_lock(&sessions_mutex
);
520 if (!session
->active
) {
524 WRITE_ONCE(session
->active
, 0);
526 /* Set transient enabler state to "disabled" */
527 session
->priv
->tstate
= 0;
528 lttng_session_sync_event_enablers(session
);
530 /* Set each stream's quiescent state. */
531 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
532 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
533 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
536 mutex_unlock(&sessions_mutex
);
540 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
543 struct lttng_kernel_channel_buffer_private
*chan_priv
;
544 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
545 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
546 struct lttng_metadata_stream
*stream
;
548 mutex_lock(&sessions_mutex
);
549 if (!session
->active
) {
554 mutex_lock(&cache
->lock
);
555 memset(cache
->data
, 0, cache
->cache_alloc
);
556 cache
->metadata_written
= 0;
558 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
559 stream
->metadata_out
= 0;
560 stream
->metadata_in
= 0;
562 mutex_unlock(&cache
->lock
);
564 session
->priv
->metadata_dumped
= 0;
565 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
566 chan_priv
->metadata_dumped
= 0;
569 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
570 event_recorder_priv
->metadata_dumped
= 0;
573 ret
= _lttng_session_metadata_statedump(session
);
576 mutex_unlock(&sessions_mutex
);
581 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
583 struct lttng_kernel_channel_buffer
*chan_buf
;
585 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
587 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
588 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
593 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
597 mutex_lock(&sessions_mutex
);
598 if (is_channel_buffer_metadata(channel
)) {
602 if (channel
->enabled
) {
606 /* Set transient enabler state to "enabled" */
607 channel
->priv
->tstate
= 1;
608 lttng_session_sync_event_enablers(channel
->session
);
609 /* Set atomically the state to "enabled" */
610 WRITE_ONCE(channel
->enabled
, 1);
612 mutex_unlock(&sessions_mutex
);
616 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
620 mutex_lock(&sessions_mutex
);
621 if (is_channel_buffer_metadata(channel
)) {
625 if (!channel
->enabled
) {
629 /* Set atomically the state to "disabled" */
630 WRITE_ONCE(channel
->enabled
, 0);
631 /* Set transient enabler state to "enabled" */
632 channel
->priv
->tstate
= 0;
633 lttng_session_sync_event_enablers(channel
->session
);
635 mutex_unlock(&sessions_mutex
);
639 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
643 mutex_lock(&sessions_mutex
);
644 switch (event
->type
) {
645 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
647 struct lttng_kernel_event_recorder
*event_recorder
=
648 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
650 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
656 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
657 switch (event
->priv
->instrumentation
) {
658 case LTTNG_KERNEL_ABI_KRETPROBE
:
669 if (event
->enabled
) {
673 switch (event
->priv
->instrumentation
) {
674 case LTTNG_KERNEL_ABI_TRACEPOINT
:
676 case LTTNG_KERNEL_ABI_SYSCALL
:
680 case LTTNG_KERNEL_ABI_KPROBE
:
682 case LTTNG_KERNEL_ABI_UPROBE
:
683 WRITE_ONCE(event
->enabled
, 1);
686 case LTTNG_KERNEL_ABI_KRETPROBE
:
687 ret
= lttng_kretprobes_event_enable_state(event
, 1);
690 case LTTNG_KERNEL_ABI_FUNCTION
:
692 case LTTNG_KERNEL_ABI_NOOP
:
699 mutex_unlock(&sessions_mutex
);
703 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
707 mutex_lock(&sessions_mutex
);
708 switch (event
->type
) {
709 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
711 struct lttng_kernel_event_recorder
*event_recorder
=
712 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
714 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
720 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
721 switch (event
->priv
->instrumentation
) {
722 case LTTNG_KERNEL_ABI_KRETPROBE
:
733 if (!event
->enabled
) {
737 switch (event
->priv
->instrumentation
) {
738 case LTTNG_KERNEL_ABI_TRACEPOINT
:
740 case LTTNG_KERNEL_ABI_SYSCALL
:
744 case LTTNG_KERNEL_ABI_KPROBE
:
746 case LTTNG_KERNEL_ABI_UPROBE
:
747 WRITE_ONCE(event
->enabled
, 0);
750 case LTTNG_KERNEL_ABI_KRETPROBE
:
751 ret
= lttng_kretprobes_event_enable_state(event
, 0);
754 case LTTNG_KERNEL_ABI_FUNCTION
:
756 case LTTNG_KERNEL_ABI_NOOP
:
763 mutex_unlock(&sessions_mutex
);
767 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
768 const char *transport_name
,
770 size_t subbuf_size
, size_t num_subbuf
,
771 unsigned int switch_timer_interval
,
772 unsigned int read_timer_interval
,
773 enum channel_type channel_type
)
775 struct lttng_kernel_channel_buffer
*chan
;
776 struct lttng_kernel_channel_buffer_private
*chan_priv
;
777 struct lttng_transport
*transport
= NULL
;
779 mutex_lock(&sessions_mutex
);
780 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
781 goto active
; /* Refuse to add channel to active session */
782 transport
= lttng_transport_find(transport_name
);
784 printk(KERN_WARNING
"LTTng: transport %s not found\n",
788 if (!try_module_get(transport
->owner
)) {
789 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
792 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
795 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
798 chan
->priv
= chan_priv
;
799 chan_priv
->pub
= chan
;
800 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
801 chan
->parent
.session
= session
;
802 chan
->priv
->id
= session
->priv
->free_chan_id
++;
803 chan
->ops
= &transport
->ops
;
805 * Note: the channel creation op already writes into the packet
806 * headers. Therefore the "chan" information used as input
807 * should be already accessible.
809 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
810 chan
, buf_addr
, subbuf_size
, num_subbuf
,
811 switch_timer_interval
, read_timer_interval
);
812 if (!chan
->priv
->rb_chan
)
814 chan
->priv
->parent
.tstate
= 1;
815 chan
->parent
.enabled
= 1;
816 chan
->priv
->transport
= transport
;
817 chan
->priv
->channel_type
= channel_type
;
818 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
819 mutex_unlock(&sessions_mutex
);
828 module_put(transport
->owner
);
831 mutex_unlock(&sessions_mutex
);
836 * Only used internally at session destruction for per-cpu channels, and
837 * when metadata channel is released.
838 * Needs to be called with sessions mutex held.
841 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
843 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
844 module_put(chan
->priv
->transport
->owner
);
845 list_del(&chan
->priv
->node
);
846 lttng_kernel_destroy_context(chan
->priv
->ctx
);
851 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
853 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
855 /* Protect the metadata cache with the sessions_mutex. */
856 mutex_lock(&sessions_mutex
);
857 _lttng_channel_destroy(chan
);
858 mutex_unlock(&sessions_mutex
);
860 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
863 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
865 stream
->finalized
= 1;
866 wake_up_interruptible(&stream
->read_wait
);
871 * Supports event creation while tracing session is active.
872 * Needs to be called with sessions mutex held.
875 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
876 const struct lttng_kernel_event_desc
*event_desc
)
878 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
879 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
880 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
881 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
882 struct lttng_kernel_event_recorder
*event_recorder
;
883 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
884 struct lttng_kernel_event_common_private
*event_priv
;
885 const char *event_name
;
886 struct hlist_head
*head
;
889 if (chan
->priv
->free_event_id
== -1U) {
895 case LTTNG_KERNEL_ABI_TRACEPOINT
:
896 event_name
= event_desc
->event_name
;
899 case LTTNG_KERNEL_ABI_KPROBE
:
901 case LTTNG_KERNEL_ABI_UPROBE
:
903 case LTTNG_KERNEL_ABI_KRETPROBE
:
905 case LTTNG_KERNEL_ABI_SYSCALL
:
906 event_name
= event_param
->name
;
909 case LTTNG_KERNEL_ABI_FUNCTION
:
911 case LTTNG_KERNEL_ABI_NOOP
:
919 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
920 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
921 event_recorder_priv
= container_of(event_priv
, struct lttng_kernel_event_recorder_private
, parent
);
923 WARN_ON_ONCE(!event_priv
->desc
);
924 if (!strncmp(event_priv
->desc
->event_name
, event_name
,
925 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
926 && chan
== event_recorder_priv
->pub
->chan
) {
932 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
933 if (!event_recorder
) {
937 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
938 if (!event_recorder_priv
) {
940 goto cache_private_error
;
942 event_recorder_priv
->pub
= event_recorder
;
943 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
944 event_recorder
->priv
= event_recorder_priv
;
945 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
946 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
948 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
949 event_recorder
->chan
= chan
;
950 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
951 event_recorder
->priv
->parent
.instrumentation
= itype
;
952 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
953 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
956 case LTTNG_KERNEL_ABI_TRACEPOINT
:
957 /* Event will be enabled by enabler sync. */
958 event_recorder
->parent
.enabled
= 0;
959 event_recorder
->priv
->parent
.registered
= 0;
960 event_recorder
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
961 if (!event_recorder
->priv
->parent
.desc
) {
965 /* Populate lttng_event structure before event registration. */
969 case LTTNG_KERNEL_ABI_KPROBE
:
971 * Needs to be explicitly enabled after creation, since
972 * we may want to apply filters.
974 event_recorder
->parent
.enabled
= 0;
975 event_recorder
->priv
->parent
.registered
= 1;
977 * Populate lttng_event structure before event
981 ret
= lttng_kprobes_register_event(event_name
,
982 event_param
->u
.kprobe
.symbol_name
,
983 event_param
->u
.kprobe
.offset
,
984 event_param
->u
.kprobe
.addr
,
985 &event_recorder
->parent
);
990 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
994 case LTTNG_KERNEL_ABI_KRETPROBE
:
996 struct lttng_kernel_event_recorder
*event_recorder_return
;
997 struct lttng_kernel_event_recorder_private
*event_recorder_return_priv
;
999 /* kretprobe defines 2 events */
1001 * Needs to be explicitly enabled after creation, since
1002 * we may want to apply filters.
1004 event_recorder
->parent
.enabled
= 0;
1005 event_recorder
->priv
->parent
.registered
= 1;
1007 event_recorder_return
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
1008 if (!event_recorder_return
) {
1010 goto register_error
;
1012 event_recorder_return_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
1013 if (!event_recorder_return_priv
) {
1014 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1016 goto register_error
;
1018 event_recorder_return_priv
->pub
= event_recorder_return
;
1019 event_recorder_return_priv
->parent
.pub
= &event_recorder_return
->parent
;
1020 event_recorder_return
->priv
= event_recorder_return_priv
;
1021 event_recorder_return
->parent
.priv
= &event_recorder_return_priv
->parent
;
1022 event_recorder_return
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
1024 event_recorder_return
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1025 event_recorder_return
->chan
= chan
;
1026 event_recorder_return
->priv
->id
= chan
->priv
->free_event_id
++;
1027 event_recorder_return
->priv
->parent
.instrumentation
= itype
;
1028 event_recorder_return
->parent
.enabled
= 0;
1029 event_recorder_return
->priv
->parent
.registered
= 1;
1030 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.filter_bytecode_runtime_head
);
1031 INIT_LIST_HEAD(&event_recorder_return
->priv
->parent
.enablers_ref_head
);
1033 * Populate lttng_event structure before kretprobe registration.
1036 ret
= lttng_kretprobes_register(event_name
,
1037 event_param
->u
.kretprobe
.symbol_name
,
1038 event_param
->u
.kretprobe
.offset
,
1039 event_param
->u
.kretprobe
.addr
,
1040 &event_recorder
->parent
, &event_recorder_return
->parent
);
1042 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1043 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1045 goto register_error
;
1047 /* Take 2 refs on the module: one per event. */
1048 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1050 ret
= try_module_get(event_recorder_return
->priv
->parent
.desc
->owner
);
1052 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
,
1053 event_recorder_return
);
1054 WARN_ON_ONCE(ret
> 0);
1056 kmem_cache_free(event_recorder_private_cache
, event_recorder_return_priv
);
1057 kmem_cache_free(event_recorder_cache
, event_recorder_return
);
1058 module_put(event_recorder_return
->priv
->parent
.desc
->owner
);
1059 module_put(event_recorder
->priv
->parent
.desc
->owner
);
1060 goto statedump_error
;
1062 list_add(&event_recorder_return
->priv
->parent
.node
, &chan
->parent
.session
->priv
->events
);
1066 case LTTNG_KERNEL_ABI_SYSCALL
:
1068 * Needs to be explicitly enabled after creation, since
1069 * we may want to apply filters.
1071 event_recorder
->parent
.enabled
= 0;
1072 event_recorder
->priv
->parent
.registered
= 0;
1073 event_recorder
->priv
->parent
.desc
= event_desc
;
1074 switch (event_param
->u
.syscall
.entryexit
) {
1075 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1077 goto register_error
;
1078 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1079 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1081 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1082 event_recorder
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1085 switch (event_param
->u
.syscall
.abi
) {
1086 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1088 goto register_error
;
1089 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1090 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1092 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1093 event_recorder
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1096 if (!event_recorder
->priv
->parent
.desc
) {
1098 goto register_error
;
1102 case LTTNG_KERNEL_ABI_UPROBE
:
1104 * Needs to be explicitly enabled after creation, since
1105 * we may want to apply filters.
1107 event_recorder
->parent
.enabled
= 0;
1108 event_recorder
->priv
->parent
.registered
= 1;
1111 * Populate lttng_event structure before event
1116 ret
= lttng_uprobes_register_event(event_param
->name
,
1117 event_param
->u
.uprobe
.fd
,
1118 &event_recorder
->parent
);
1120 goto register_error
;
1121 ret
= try_module_get(event_recorder
->priv
->parent
.desc
->owner
);
1125 case LTTNG_KERNEL_ABI_FUNCTION
:
1127 case LTTNG_KERNEL_ABI_NOOP
:
1132 goto register_error
;
1134 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1135 WARN_ON_ONCE(ret
> 0);
1137 goto statedump_error
;
1139 hlist_add_head(&event_recorder
->priv
->parent
.hlist_node
, head
);
1140 list_add(&event_recorder
->priv
->parent
.node
, &chan
->parent
.session
->priv
->events
);
1141 return event_recorder
;
1144 /* If a statedump error occurs, events will not be readable. */
1146 kmem_cache_free(event_recorder_private_cache
, event_recorder_priv
);
1147 cache_private_error
:
1148 kmem_cache_free(event_recorder_cache
, event_recorder
);
1153 return ERR_PTR(ret
);
1157 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1158 const struct lttng_kernel_event_desc
*event_desc
)
1160 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1161 struct lttng_event_notifier_group
*event_notifier_group
= event_enabler
->group
;
1162 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1163 uint64_t token
= event_enabler
->parent
.user_token
;
1164 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1165 struct lttng_kernel_event_notifier
*event_notifier
;
1166 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1167 struct lttng_kernel_event_common_private
*event_priv
;
1168 struct lttng_counter
*error_counter
;
1169 const char *event_name
;
1170 struct hlist_head
*head
;
1174 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1175 event_name
= event_desc
->event_name
;
1178 case LTTNG_KERNEL_ABI_KPROBE
:
1180 case LTTNG_KERNEL_ABI_UPROBE
:
1182 case LTTNG_KERNEL_ABI_SYSCALL
:
1183 event_name
= event_param
->name
;
1186 case LTTNG_KERNEL_ABI_KRETPROBE
:
1188 case LTTNG_KERNEL_ABI_FUNCTION
:
1190 case LTTNG_KERNEL_ABI_NOOP
:
1198 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1199 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1200 event_notifier_priv
= container_of(event_priv
, struct lttng_kernel_event_notifier_private
, parent
);
1202 WARN_ON_ONCE(!event_priv
->desc
);
1203 if (!strncmp(event_priv
->desc
->event_name
, event_name
,
1204 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1205 && event_notifier_group
== event_notifier_priv
->group
1206 && token
== event_priv
->user_token
) {
1212 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1213 if (!event_notifier
) {
1217 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
1218 if (!event_notifier_priv
) {
1220 goto cache_private_error
;
1222 event_notifier_priv
->pub
= event_notifier
;
1223 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
1224 event_notifier
->priv
= event_notifier_priv
;
1225 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
1226 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
1228 event_notifier
->priv
->group
= event_notifier_group
;
1229 event_notifier
->priv
->parent
.user_token
= event_enabler
->parent
.user_token
;
1230 event_notifier
->priv
->error_counter_index
= event_enabler
->error_counter_index
;
1231 event_notifier
->priv
->num_captures
= 0;
1232 event_notifier
->priv
->parent
.instrumentation
= itype
;
1233 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
1234 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
1235 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
1236 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
1237 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
1240 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1241 /* Event will be enabled by enabler sync. */
1242 event_notifier
->parent
.enabled
= 0;
1243 event_notifier
->priv
->parent
.registered
= 0;
1244 event_notifier
->priv
->parent
.desc
= lttng_event_desc_get(event_name
);
1245 if (!event_notifier
->priv
->parent
.desc
) {
1247 goto register_error
;
1249 /* Populate lttng_event_notifier structure before event registration. */
1253 case LTTNG_KERNEL_ABI_KPROBE
:
1255 * Needs to be explicitly enabled after creation, since
1256 * we may want to apply filters.
1258 event_notifier
->parent
.enabled
= 0;
1259 event_notifier
->priv
->parent
.registered
= 1;
1261 * Populate lttng_event_notifier structure before event
1265 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1266 event_param
->u
.kprobe
.symbol_name
,
1267 event_param
->u
.kprobe
.offset
,
1268 event_param
->u
.kprobe
.addr
,
1269 &event_notifier
->parent
);
1272 goto register_error
;
1274 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1278 case LTTNG_KERNEL_ABI_SYSCALL
:
1280 * Needs to be explicitly enabled after creation, since
1281 * we may want to apply filters.
1283 event_notifier
->parent
.enabled
= 0;
1284 event_notifier
->priv
->parent
.registered
= 0;
1285 event_notifier
->priv
->parent
.desc
= event_desc
;
1286 switch (event_param
->u
.syscall
.entryexit
) {
1287 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1289 goto register_error
;
1290 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1291 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1293 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1294 event_notifier
->priv
->parent
.u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1297 switch (event_param
->u
.syscall
.abi
) {
1298 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1300 goto register_error
;
1301 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1302 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1304 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1305 event_notifier
->priv
->parent
.u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1309 if (!event_notifier
->priv
->parent
.desc
) {
1311 goto register_error
;
1315 case LTTNG_KERNEL_ABI_UPROBE
:
1317 * Needs to be explicitly enabled after creation, since
1318 * we may want to apply filters.
1320 event_notifier
->parent
.enabled
= 0;
1321 event_notifier
->priv
->parent
.registered
= 1;
1324 * Populate lttng_event_notifier structure before
1325 * event_notifier registration.
1329 ret
= lttng_uprobes_register_event(event_param
->name
,
1330 event_param
->u
.uprobe
.fd
,
1331 &event_notifier
->parent
);
1333 goto register_error
;
1334 ret
= try_module_get(event_notifier
->priv
->parent
.desc
->owner
);
1338 case LTTNG_KERNEL_ABI_KRETPROBE
:
1340 case LTTNG_KERNEL_ABI_FUNCTION
:
1342 case LTTNG_KERNEL_ABI_NOOP
:
1347 goto register_error
;
1350 list_add(&event_notifier
->priv
->parent
.node
, &event_notifier_group
->event_notifiers_head
);
1351 hlist_add_head(&event_notifier
->priv
->parent
.hlist_node
, head
);
1354 * Clear the error counter bucket. The sessiond keeps track of which
1355 * bucket is currently in use. We trust it. The session lock
1356 * synchronizes against concurrent creation of the error
1359 error_counter
= event_notifier_group
->error_counter
;
1360 if (error_counter
) {
1361 size_t dimension_index
[1];
1364 * Check that the index is within the boundary of the counter.
1366 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1367 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1368 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1370 goto register_error
;
1373 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1374 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1376 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1377 event_notifier
->priv
->error_counter_index
);
1378 goto register_error
;
1382 return event_notifier
;
1385 kmem_cache_free(event_notifier_private_cache
, event_notifier_priv
);
1386 cache_private_error
:
1387 kmem_cache_free(event_notifier_cache
, event_notifier
);
1391 return ERR_PTR(ret
);
1394 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1395 const struct lttng_kernel_event_desc
*event_desc
)
1397 switch (event_enabler
->enabler_type
) {
1398 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1400 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1401 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1402 struct lttng_kernel_event_recorder
*event_recorder
;
1404 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1405 if (!event_recorder
)
1407 return &event_recorder
->parent
;
1409 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1411 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1412 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1413 struct lttng_kernel_event_notifier
*event_notifier
;
1415 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1416 if (!event_notifier
)
1418 return &event_notifier
->parent
;
1425 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1426 const struct lttng_kernel_event_desc
*event_desc
)
1428 struct lttng_kernel_event_common
*event
;
1430 mutex_lock(&sessions_mutex
);
1431 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1432 mutex_unlock(&sessions_mutex
);
1438 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1439 const size_t *dim_indexes
, int32_t cpu
,
1440 int64_t *val
, bool *overflow
, bool *underflow
)
1442 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1443 cpu
, val
, overflow
, underflow
);
1446 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1447 const size_t *dim_indexes
, int64_t *val
,
1448 bool *overflow
, bool *underflow
)
1450 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1451 val
, overflow
, underflow
);
1454 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1455 const size_t *dim_indexes
)
1457 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1460 /* Only used for tracepoints for now. */
1462 void register_event(struct lttng_kernel_event_common
*event
)
1464 const struct lttng_kernel_event_desc
*desc
;
1467 if (event
->priv
->registered
)
1470 desc
= event
->priv
->desc
;
1471 switch (event
->priv
->instrumentation
) {
1472 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1473 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1474 desc
->tp_class
->probe_callback
,
1478 case LTTNG_KERNEL_ABI_SYSCALL
:
1479 ret
= lttng_syscall_filter_enable_event(event
);
1482 case LTTNG_KERNEL_ABI_KPROBE
:
1484 case LTTNG_KERNEL_ABI_UPROBE
:
1488 case LTTNG_KERNEL_ABI_KRETPROBE
:
1489 switch (event
->type
) {
1490 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1493 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1499 case LTTNG_KERNEL_ABI_FUNCTION
:
1501 case LTTNG_KERNEL_ABI_NOOP
:
1507 event
->priv
->registered
= 1;
1510 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1512 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1513 const struct lttng_kernel_event_desc
*desc
;
1516 if (!event_priv
->registered
)
1519 desc
= event_priv
->desc
;
1520 switch (event_priv
->instrumentation
) {
1521 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1522 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1523 event_priv
->desc
->tp_class
->probe_callback
,
1527 case LTTNG_KERNEL_ABI_KPROBE
:
1528 lttng_kprobes_unregister_event(event
);
1532 case LTTNG_KERNEL_ABI_KRETPROBE
:
1533 switch (event
->type
) {
1534 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1535 lttng_kretprobes_unregister(event
);
1538 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1544 case LTTNG_KERNEL_ABI_SYSCALL
:
1545 ret
= lttng_syscall_filter_disable_event(event
);
1548 case LTTNG_KERNEL_ABI_NOOP
:
1549 switch (event
->type
) {
1550 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1553 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1559 case LTTNG_KERNEL_ABI_UPROBE
:
1560 lttng_uprobes_unregister_event(event
);
1564 case LTTNG_KERNEL_ABI_FUNCTION
:
1570 event_priv
->registered
= 0;
1575 * Only used internally at session destruction.
1578 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1580 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1581 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1583 lttng_free_event_filter_runtime(event
);
1584 /* Free event enabler refs */
1585 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1586 &event_priv
->enablers_ref_head
, node
)
1589 switch (event
->type
) {
1590 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1592 struct lttng_kernel_event_recorder
*event_recorder
=
1593 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1595 switch (event_priv
->instrumentation
) {
1596 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1597 lttng_event_desc_put(event_priv
->desc
);
1600 case LTTNG_KERNEL_ABI_KPROBE
:
1601 module_put(event_priv
->desc
->owner
);
1602 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1605 case LTTNG_KERNEL_ABI_KRETPROBE
:
1606 module_put(event_priv
->desc
->owner
);
1607 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1610 case LTTNG_KERNEL_ABI_SYSCALL
:
1613 case LTTNG_KERNEL_ABI_UPROBE
:
1614 module_put(event_priv
->desc
->owner
);
1615 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1618 case LTTNG_KERNEL_ABI_FUNCTION
:
1620 case LTTNG_KERNEL_ABI_NOOP
:
1625 list_del(&event_recorder
->priv
->parent
.node
);
1626 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1627 kmem_cache_free(event_recorder_cache
, event_recorder
);
1630 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1632 struct lttng_kernel_event_notifier
*event_notifier
=
1633 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1635 switch (event_notifier
->priv
->parent
.instrumentation
) {
1636 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1637 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1640 case LTTNG_KERNEL_ABI_KPROBE
:
1641 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1642 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1645 case LTTNG_KERNEL_ABI_SYSCALL
:
1648 case LTTNG_KERNEL_ABI_UPROBE
:
1649 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1650 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1653 case LTTNG_KERNEL_ABI_KRETPROBE
:
1655 case LTTNG_KERNEL_ABI_FUNCTION
:
1657 case LTTNG_KERNEL_ABI_NOOP
:
1662 list_del(&event_notifier
->priv
->parent
.node
);
1663 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1664 kmem_cache_free(event_notifier_cache
, event_notifier
);
1672 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1673 enum tracker_type tracker_type
)
1675 switch (tracker_type
) {
1677 return &session
->pid_tracker
;
1679 return &session
->vpid_tracker
;
1681 return &session
->uid_tracker
;
1683 return &session
->vuid_tracker
;
1685 return &session
->gid_tracker
;
1687 return &session
->vgid_tracker
;
1694 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1695 enum tracker_type tracker_type
, int id
)
1697 struct lttng_kernel_id_tracker
*tracker
;
1700 tracker
= get_tracker(session
, tracker_type
);
1705 mutex_lock(&sessions_mutex
);
1707 /* track all ids: destroy tracker. */
1708 lttng_id_tracker_destroy(tracker
, true);
1711 ret
= lttng_id_tracker_add(tracker
, id
);
1713 mutex_unlock(&sessions_mutex
);
1717 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1718 enum tracker_type tracker_type
, int id
)
1720 struct lttng_kernel_id_tracker
*tracker
;
1723 tracker
= get_tracker(session
, tracker_type
);
1728 mutex_lock(&sessions_mutex
);
1730 /* untrack all ids: replace by empty tracker. */
1731 ret
= lttng_id_tracker_empty_set(tracker
);
1733 ret
= lttng_id_tracker_del(tracker
, id
);
1735 mutex_unlock(&sessions_mutex
);
1740 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1742 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1743 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1744 struct lttng_id_hash_node
*e
;
1747 mutex_lock(&sessions_mutex
);
1749 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1750 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1752 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1758 /* ID tracker disabled. */
1759 if (iter
>= *pos
&& iter
== 0) {
1760 return id_tracker_p
; /* empty tracker */
1768 /* Called with sessions_mutex held. */
1770 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1772 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1773 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1774 struct lttng_id_hash_node
*e
;
1779 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1780 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1782 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1783 if (iter
++ >= *ppos
)
1788 /* ID tracker disabled. */
1789 if (iter
>= *ppos
&& iter
== 0)
1790 return p
; /* empty tracker */
1799 void id_list_stop(struct seq_file
*m
, void *p
)
1801 mutex_unlock(&sessions_mutex
);
1805 int id_list_show(struct seq_file
*m
, void *p
)
1807 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1808 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1811 if (p
== id_tracker_p
) {
1812 /* Tracker disabled. */
1815 const struct lttng_id_hash_node
*e
= p
;
1817 id
= lttng_id_tracker_get_node_id(e
);
1819 switch (id_tracker
->priv
->tracker_type
) {
1821 seq_printf(m
, "process { pid = %d; };\n", id
);
1824 seq_printf(m
, "process { vpid = %d; };\n", id
);
1827 seq_printf(m
, "user { uid = %d; };\n", id
);
1830 seq_printf(m
, "user { vuid = %d; };\n", id
);
1833 seq_printf(m
, "group { gid = %d; };\n", id
);
1836 seq_printf(m
, "group { vgid = %d; };\n", id
);
1839 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1845 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1846 .start
= id_list_start
,
1847 .next
= id_list_next
,
1848 .stop
= id_list_stop
,
1849 .show
= id_list_show
,
1853 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1855 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1859 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1861 struct seq_file
*m
= file
->private_data
;
1862 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1865 WARN_ON_ONCE(!id_tracker
);
1866 ret
= seq_release(inode
, file
);
1868 fput(id_tracker
->priv
->session
->priv
->file
);
1872 const struct file_operations lttng_tracker_ids_list_fops
= {
1873 .owner
= THIS_MODULE
,
1874 .open
= lttng_tracker_ids_list_open
,
1876 .llseek
= seq_lseek
,
1877 .release
= lttng_tracker_ids_list_release
,
1880 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1881 enum tracker_type tracker_type
)
1883 struct file
*tracker_ids_list_file
;
1887 file_fd
= lttng_get_unused_fd();
1893 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1894 <tng_tracker_ids_list_fops
,
1896 if (IS_ERR(tracker_ids_list_file
)) {
1897 ret
= PTR_ERR(tracker_ids_list_file
);
1900 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1902 goto refcount_error
;
1904 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1907 m
= tracker_ids_list_file
->private_data
;
1909 m
->private = get_tracker(session
, tracker_type
);
1910 BUG_ON(!m
->private);
1911 fd_install(file_fd
, tracker_ids_list_file
);
1916 atomic_long_dec(&session
->priv
->file
->f_count
);
1918 fput(tracker_ids_list_file
);
1920 put_unused_fd(file_fd
);
1926 * Enabler management.
1929 int lttng_match_enabler_star_glob(const char *desc_name
,
1930 const char *pattern
)
1932 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1933 desc_name
, LTTNG_SIZE_MAX
))
1939 int lttng_match_enabler_name(const char *desc_name
,
1942 if (strcmp(desc_name
, name
))
1948 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1949 struct lttng_event_enabler_common
*enabler
)
1951 const char *desc_name
, *enabler_name
;
1952 bool compat
= false, entry
= false;
1954 enabler_name
= enabler
->event_param
.name
;
1955 switch (enabler
->event_param
.instrumentation
) {
1956 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1957 desc_name
= desc
->event_name
;
1958 switch (enabler
->format_type
) {
1959 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1960 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1961 case LTTNG_ENABLER_FORMAT_NAME
:
1962 return lttng_match_enabler_name(desc_name
, enabler_name
);
1968 case LTTNG_KERNEL_ABI_SYSCALL
:
1969 desc_name
= desc
->event_name
;
1970 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1971 desc_name
+= strlen("compat_");
1974 if (!strncmp(desc_name
, "syscall_exit_",
1975 strlen("syscall_exit_"))) {
1976 desc_name
+= strlen("syscall_exit_");
1977 } else if (!strncmp(desc_name
, "syscall_entry_",
1978 strlen("syscall_entry_"))) {
1979 desc_name
+= strlen("syscall_entry_");
1985 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1986 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1988 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1992 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1999 switch (enabler
->event_param
.u
.syscall
.abi
) {
2000 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2002 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2006 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2013 switch (enabler
->event_param
.u
.syscall
.match
) {
2014 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2015 switch (enabler
->format_type
) {
2016 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2017 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2018 case LTTNG_ENABLER_FORMAT_NAME
:
2019 return lttng_match_enabler_name(desc_name
, enabler_name
);
2024 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2025 return -EINVAL
; /* Not implemented. */
2037 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2038 struct lttng_event_enabler_common
*enabler
)
2042 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2050 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2051 struct lttng_kernel_event_common
*event
)
2053 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2056 switch (event_enabler
->enabler_type
) {
2057 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2059 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2060 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2061 struct lttng_kernel_event_recorder
*event_recorder
=
2062 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2064 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2065 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2070 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2072 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2073 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2074 struct lttng_kernel_event_notifier
*event_notifier
=
2075 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2077 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2078 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2079 && event
->priv
->user_token
== event_enabler
->user_token
)
2090 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2091 const struct lttng_kernel_event_desc
*desc
,
2092 struct lttng_kernel_event_common
*event
)
2094 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2097 switch (event_enabler
->enabler_type
) {
2098 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2100 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2101 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2102 struct lttng_kernel_event_recorder
*event_recorder
=
2103 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2105 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2110 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2112 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2113 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2114 struct lttng_kernel_event_notifier
*event_notifier
=
2115 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2117 if (event
->priv
->desc
== desc
2118 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2119 && event
->priv
->user_token
== event_enabler
->user_token
)
2131 struct lttng_enabler_ref
*lttng_enabler_ref(
2132 struct list_head
*enablers_ref_list
,
2133 struct lttng_event_enabler_common
*enabler
)
2135 struct lttng_enabler_ref
*enabler_ref
;
2137 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2138 if (enabler_ref
->ref
== enabler
)
2145 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2147 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2148 struct lttng_kernel_probe_desc
*probe_desc
;
2149 const struct lttng_kernel_event_desc
*desc
;
2150 struct list_head
*probe_list
;
2153 probe_list
= lttng_get_probe_list_head();
2155 * For each probe event, if we find that a probe event matches
2156 * our enabler, create an associated lttng_event if not
2159 list_for_each_entry(probe_desc
, probe_list
, head
) {
2160 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2162 struct hlist_head
*head
;
2163 struct lttng_kernel_event_common
*event
;
2164 struct lttng_kernel_event_common_private
*event_priv
;
2166 desc
= probe_desc
->event_desc
[i
];
2167 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2171 * Check if already created.
2173 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2174 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2175 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2182 * We need to create an event for this event probe.
2184 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2186 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2187 probe_desc
->event_desc
[i
]->event_name
);
2194 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2198 ret
= lttng_syscalls_register_event(event_enabler
);
2203 * Create event if it is missing and present in the list of tracepoint probes.
2204 * Should be called with sessions mutex held.
2207 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2209 switch (event_enabler
->event_param
.instrumentation
) {
2210 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2211 lttng_create_tracepoint_event_if_missing(event_enabler
);
2214 case LTTNG_KERNEL_ABI_SYSCALL
:
2215 lttng_create_syscall_event_if_missing(event_enabler
);
2225 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2226 struct lttng_kernel_event_common
*event
)
2228 /* Link filter bytecodes if not linked yet. */
2229 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2230 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2234 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2235 struct lttng_kernel_event_common
*event
)
2237 switch (event_enabler
->enabler_type
) {
2238 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2240 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2242 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2243 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2244 struct lttng_kernel_event_notifier
*event_notifier
=
2245 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2247 /* Link capture bytecodes if not linked yet. */
2248 lttng_enabler_link_bytecode(event
->priv
->desc
,
2249 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2250 &event_notifier_enabler
->capture_bytecode_head
);
2251 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2260 * Create events associated with an event_enabler (if not already present),
2261 * and add backward reference from the event to the enabler.
2262 * Should be called with sessions mutex held.
2265 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2267 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2268 struct lttng_kernel_event_common_private
*event_priv
;
2270 lttng_syscall_table_set_wildcard_all(event_enabler
);
2272 /* First ensure that probe events are created for this enabler. */
2273 lttng_create_event_if_missing(event_enabler
);
2275 /* Link the created event with its associated enabler. */
2276 list_for_each_entry(event_priv
, event_list_head
, node
) {
2277 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2278 struct lttng_enabler_ref
*enabler_ref
;
2280 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2283 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2286 * If no backward ref, create it.
2287 * Add backward ref from event_notifier to enabler.
2289 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2293 enabler_ref
->ref
= event_enabler
;
2294 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2297 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2298 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2304 * Called at module load: connect the probe on all enablers matching
2306 * Called with sessions lock held.
2308 int lttng_fix_pending_events(void)
2310 struct lttng_kernel_session_private
*session_priv
;
2312 list_for_each_entry(session_priv
, &sessions
, list
)
2313 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2317 static bool lttng_event_notifier_group_has_active_event_notifiers(
2318 struct lttng_event_notifier_group
*event_notifier_group
)
2320 struct lttng_event_enabler_common
*event_enabler
;
2322 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2323 if (event_enabler
->enabled
)
2329 bool lttng_event_notifier_active(void)
2331 struct lttng_event_notifier_group
*event_notifier_group
;
2333 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2334 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2340 int lttng_fix_pending_event_notifiers(void)
2342 struct lttng_event_notifier_group
*event_notifier_group
;
2344 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2345 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2349 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2350 enum lttng_enabler_format_type format_type
,
2351 struct lttng_kernel_abi_event
*event_param
,
2352 struct lttng_kernel_channel_buffer
*chan
)
2354 struct lttng_event_recorder_enabler
*event_enabler
;
2356 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2359 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2360 event_enabler
->parent
.format_type
= format_type
;
2361 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2362 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2363 sizeof(event_enabler
->parent
.event_param
));
2364 event_enabler
->chan
= chan
;
2366 event_enabler
->parent
.enabled
= 0;
2367 return event_enabler
;
2370 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2371 struct lttng_event_recorder_enabler
*event_enabler
)
2373 mutex_lock(&sessions_mutex
);
2374 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2375 event_enabler
->parent
.published
= true;
2376 lttng_session_lazy_sync_event_enablers(session
);
2377 mutex_unlock(&sessions_mutex
);
2380 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2382 mutex_lock(&sessions_mutex
);
2383 event_enabler
->enabled
= 1;
2384 lttng_event_enabler_sync(event_enabler
);
2385 mutex_unlock(&sessions_mutex
);
2389 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2391 mutex_lock(&sessions_mutex
);
2392 event_enabler
->enabled
= 0;
2393 lttng_event_enabler_sync(event_enabler
);
2394 mutex_unlock(&sessions_mutex
);
2399 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2400 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2402 struct lttng_kernel_bytecode_node
*bytecode_node
;
2403 uint32_t bytecode_len
;
2406 ret
= get_user(bytecode_len
, &bytecode
->len
);
2409 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2413 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2414 sizeof(*bytecode
) + bytecode_len
);
2418 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2419 bytecode_node
->enabler
= enabler
;
2420 /* Enforce length based on allocated size */
2421 bytecode_node
->bc
.len
= bytecode_len
;
2422 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2427 lttng_kvfree(bytecode_node
);
2431 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2432 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2435 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2438 lttng_event_enabler_sync(event_enabler
);
2445 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2446 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2449 switch (event
->priv
->instrumentation
) {
2450 case LTTNG_KERNEL_ABI_UPROBE
:
2451 return lttng_uprobes_event_add_callsite(event
, callsite
);
2458 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2460 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2462 /* Destroy filter bytecode */
2463 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2464 &enabler
->filter_bytecode_head
, node
) {
2465 lttng_kvfree(filter_node
);
2469 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2471 lttng_enabler_destroy(event_enabler
);
2472 if (event_enabler
->published
)
2473 list_del(&event_enabler
->node
);
2475 switch (event_enabler
->enabler_type
) {
2476 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2478 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2479 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2481 kfree(event_recorder_enabler
);
2484 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2486 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2487 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2489 kfree(event_notifier_enabler
);
2497 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2498 enum lttng_enabler_format_type format_type
,
2499 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2500 struct lttng_event_notifier_group
*event_notifier_group
)
2502 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2504 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2505 if (!event_notifier_enabler
)
2508 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2509 event_notifier_enabler
->parent
.format_type
= format_type
;
2510 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2511 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2513 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2514 event_notifier_enabler
->num_captures
= 0;
2516 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2517 sizeof(event_notifier_enabler
->parent
.event_param
));
2519 event_notifier_enabler
->parent
.enabled
= 0;
2520 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2521 event_notifier_enabler
->group
= event_notifier_group
;
2522 return event_notifier_enabler
;
2525 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2526 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2528 mutex_lock(&sessions_mutex
);
2529 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2530 event_notifier_enabler
->parent
.published
= true;
2531 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2532 mutex_unlock(&sessions_mutex
);
2535 int lttng_event_notifier_enabler_enable(
2536 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2538 mutex_lock(&sessions_mutex
);
2539 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2540 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2541 mutex_unlock(&sessions_mutex
);
2545 int lttng_event_notifier_enabler_disable(
2546 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2548 mutex_lock(&sessions_mutex
);
2549 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2550 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2551 mutex_unlock(&sessions_mutex
);
2555 int lttng_event_notifier_enabler_attach_capture_bytecode(
2556 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2557 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2559 struct lttng_kernel_bytecode_node
*bytecode_node
;
2560 struct lttng_event_enabler_common
*enabler
=
2561 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2562 uint32_t bytecode_len
;
2565 ret
= get_user(bytecode_len
, &bytecode
->len
);
2569 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2574 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2575 sizeof(*bytecode
) + bytecode_len
);
2579 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2580 bytecode_node
->enabler
= enabler
;
2582 /* Enforce length based on allocated size */
2583 bytecode_node
->bc
.len
= bytecode_len
;
2584 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2586 event_notifier_enabler
->num_captures
++;
2588 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2592 lttng_kvfree(bytecode_node
);
2598 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2600 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2601 struct lttng_kernel_bytecode_runtime
*runtime
;
2602 struct lttng_enabler_ref
*enabler_ref
;
2604 /* Check if has enablers without bytecode enabled */
2605 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2606 if (enabler_ref
->ref
->enabled
2607 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2608 has_enablers_without_filter_bytecode
= 1;
2612 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2614 /* Enable filters */
2615 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2616 lttng_bytecode_sync_state(runtime
);
2619 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2623 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2625 switch (event
->type
) {
2626 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2628 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2630 struct lttng_kernel_event_notifier
*event_notifier
=
2631 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2632 struct lttng_kernel_bytecode_runtime
*runtime
;
2633 int nr_captures
= 0;
2635 /* Enable captures */
2636 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2637 lttng_bytecode_sync_state(runtime
);
2640 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2649 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2651 struct lttng_enabler_ref
*enabler_ref
;
2652 bool enabled
= false;
2654 switch (event
->priv
->instrumentation
) {
2655 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2657 case LTTNG_KERNEL_ABI_SYSCALL
:
2659 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2660 if (enabler_ref
->ref
->enabled
) {
2671 switch (event
->type
) {
2672 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2674 struct lttng_kernel_event_recorder
*event_recorder
=
2675 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2678 * Enabled state is based on union of enablers, with
2679 * intersection of session and channel transient enable
2682 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2684 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2693 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2695 switch (event
->priv
->instrumentation
) {
2696 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2698 case LTTNG_KERNEL_ABI_SYSCALL
:
2702 /* Not handled with lazy sync. */
2708 * Should be called with sessions mutex held.
2711 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2712 struct list_head
*event_list
)
2714 struct lttng_kernel_event_common_private
*event_priv
;
2715 struct lttng_event_enabler_common
*event_enabler
;
2717 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2718 lttng_event_enabler_ref_events(event_enabler
);
2721 * For each event, if at least one of its enablers is enabled,
2722 * and its channel and session transient states are enabled, we
2723 * enable the event, else we disable it.
2725 list_for_each_entry(event_priv
, event_list
, node
) {
2726 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2729 if (!lttng_event_is_lazy_sync(event
))
2732 enabled
= lttng_get_event_enabled_state(event
);
2733 WRITE_ONCE(event
->enabled
, enabled
);
2735 * Sync tracepoint registration with event enabled state.
2738 register_event(event
);
2740 _lttng_event_unregister(event
);
2743 lttng_event_sync_filter_state(event
);
2744 lttng_event_sync_capture_state(event
);
2749 * lttng_session_sync_event_enablers should be called just before starting a
2753 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2755 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2759 * Apply enablers to session events, adding events to session if need
2760 * be. It is required after each modification applied to an active
2761 * session, and right before session "start".
2762 * "lazy" sync means we only sync if required.
2763 * Should be called with sessions mutex held.
2766 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2768 /* We can skip if session is not active */
2769 if (!session
->active
)
2771 lttng_session_sync_event_enablers(session
);
2775 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2777 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2781 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2783 switch (event_enabler
->enabler_type
) {
2784 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2786 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2787 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2788 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2791 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2793 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2794 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2795 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2804 * Serialize at most one packet worth of metadata into a metadata
2806 * We grab the metadata cache mutex to get exclusive access to our metadata
2807 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2808 * allows us to do racy operations such as looking for remaining space left in
2809 * packet and write, since mutual exclusion protects us from concurrent writes.
2810 * Mutual exclusion on the metadata cache allow us to read the cache content
2811 * without racing against reallocation of the cache by updates.
2812 * Returns the number of bytes written in the channel, 0 if no data
2813 * was written and a negative value on error.
2815 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2816 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2818 struct lttng_kernel_ring_buffer_ctx ctx
;
2820 size_t len
, reserve_len
;
2823 * Ensure we support mutiple get_next / put sequences followed by
2824 * put_next. The metadata cache lock protects reading the metadata
2825 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2826 * "flush" operations on the buffer invoked by different processes.
2827 * Moreover, since the metadata cache memory can be reallocated, we
2828 * need to have exclusive access against updates even though we only
2831 mutex_lock(&stream
->metadata_cache
->lock
);
2832 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2833 if (stream
->metadata_in
!= stream
->metadata_out
)
2836 /* Metadata regenerated, change the version. */
2837 if (stream
->metadata_cache
->version
!= stream
->version
)
2838 stream
->version
= stream
->metadata_cache
->version
;
2840 len
= stream
->metadata_cache
->metadata_written
-
2841 stream
->metadata_in
;
2844 reserve_len
= min_t(size_t,
2845 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2847 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2848 sizeof(char), NULL
);
2850 * If reservation failed, return an error to the caller.
2852 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2854 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2855 stream
->coherent
= false;
2858 stream
->transport
->ops
.event_write(&ctx
,
2859 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2861 stream
->transport
->ops
.event_commit(&ctx
);
2862 stream
->metadata_in
+= reserve_len
;
2863 if (reserve_len
< len
)
2864 stream
->coherent
= false;
2866 stream
->coherent
= true;
2871 *coherent
= stream
->coherent
;
2872 mutex_unlock(&stream
->metadata_cache
->lock
);
2877 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2879 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2880 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2884 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2886 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2887 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2888 struct lttng_metadata_stream
*stream
;
2890 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2891 wake_up_interruptible(&stream
->read_wait
);
2892 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2897 * Write the metadata to the metadata cache.
2898 * Must be called with sessions_mutex held.
2899 * The metadata cache lock protects us from concurrent read access from
2900 * thread outputting metadata content to ring buffer.
2901 * The content of the printf is printed as a single atomic metadata
2904 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2905 const char *fmt
, ...)
2911 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2914 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2920 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2921 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2922 session
->priv
->metadata_cache
->cache_alloc
) {
2923 char *tmp_cache_realloc
;
2924 unsigned int tmp_cache_alloc_size
;
2926 tmp_cache_alloc_size
= max_t(unsigned int,
2927 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2928 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2929 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2930 if (!tmp_cache_realloc
)
2932 if (session
->priv
->metadata_cache
->data
) {
2933 memcpy(tmp_cache_realloc
,
2934 session
->priv
->metadata_cache
->data
,
2935 session
->priv
->metadata_cache
->cache_alloc
);
2936 vfree(session
->priv
->metadata_cache
->data
);
2939 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2940 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2942 memcpy(session
->priv
->metadata_cache
->data
+
2943 session
->priv
->metadata_cache
->metadata_written
,
2945 session
->priv
->metadata_cache
->metadata_written
+= len
;
2956 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2960 for (i
= 0; i
< nesting
; i
++) {
2963 ret
= lttng_metadata_printf(session
, " ");
2972 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2973 const struct lttng_kernel_event_field
*field
,
2976 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2980 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2981 const struct lttng_kernel_type_integer
*type
,
2982 enum lttng_kernel_string_encoding parent_encoding
,
2987 ret
= print_tabs(session
, nesting
);
2990 ret
= lttng_metadata_printf(session
,
2991 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2995 (parent_encoding
== lttng_kernel_string_encoding_none
)
2997 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3001 #if __BYTE_ORDER == __BIG_ENDIAN
3002 type
->reverse_byte_order
? " byte_order = le;" : ""
3004 type
->reverse_byte_order
? " byte_order = be;" : ""
3011 * Must be called with sessions_mutex held.
3014 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3015 const struct lttng_kernel_type_struct
*type
,
3018 const char *prev_field_name
= NULL
;
3020 uint32_t i
, nr_fields
;
3021 unsigned int alignment
;
3023 ret
= print_tabs(session
, nesting
);
3026 ret
= lttng_metadata_printf(session
,
3030 nr_fields
= type
->nr_fields
;
3031 for (i
= 0; i
< nr_fields
; i
++) {
3032 const struct lttng_kernel_event_field
*iter_field
;
3034 iter_field
= type
->fields
[i
];
3035 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3039 ret
= print_tabs(session
, nesting
);
3042 alignment
= type
->alignment
;
3044 ret
= lttng_metadata_printf(session
,
3048 ret
= lttng_metadata_printf(session
,
3055 * Must be called with sessions_mutex held.
3058 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3059 const struct lttng_kernel_event_field
*field
,
3064 ret
= _lttng_struct_type_statedump(session
,
3065 lttng_kernel_get_type_struct(field
->type
), nesting
);
3068 return lttng_field_name_statedump(session
, field
, nesting
);
3072 * Must be called with sessions_mutex held.
3075 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3076 const struct lttng_kernel_type_variant
*type
,
3078 const char *prev_field_name
)
3080 const char *tag_name
;
3082 uint32_t i
, nr_choices
;
3084 tag_name
= type
->tag_name
;
3086 tag_name
= prev_field_name
;
3090 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3092 if (type
->alignment
!= 0)
3094 ret
= print_tabs(session
, nesting
);
3097 ret
= lttng_metadata_printf(session
,
3098 "variant <_%s> {\n",
3102 nr_choices
= type
->nr_choices
;
3103 for (i
= 0; i
< nr_choices
; i
++) {
3104 const struct lttng_kernel_event_field
*iter_field
;
3106 iter_field
= type
->choices
[i
];
3107 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3111 ret
= print_tabs(session
, nesting
);
3114 ret
= lttng_metadata_printf(session
,
3120 * Must be called with sessions_mutex held.
3123 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3124 const struct lttng_kernel_event_field
*field
,
3126 const char *prev_field_name
)
3130 ret
= _lttng_variant_type_statedump(session
,
3131 lttng_kernel_get_type_variant(field
->type
), nesting
,
3135 return lttng_field_name_statedump(session
, field
, nesting
);
3139 * Must be called with sessions_mutex held.
3142 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3143 const struct lttng_kernel_event_field
*field
,
3147 const struct lttng_kernel_type_array
*array_type
;
3148 const struct lttng_kernel_type_common
*elem_type
;
3150 array_type
= lttng_kernel_get_type_array(field
->type
);
3151 WARN_ON_ONCE(!array_type
);
3153 if (array_type
->alignment
) {
3154 ret
= print_tabs(session
, nesting
);
3157 ret
= lttng_metadata_printf(session
,
3158 "struct { } align(%u) _%s_padding;\n",
3159 array_type
->alignment
* CHAR_BIT
,
3165 * Nested compound types: Only array of structures and variants are
3166 * currently supported.
3168 elem_type
= array_type
->elem_type
;
3169 switch (elem_type
->type
) {
3170 case lttng_kernel_type_integer
:
3171 case lttng_kernel_type_struct
:
3172 case lttng_kernel_type_variant
:
3173 ret
= _lttng_type_statedump(session
, elem_type
,
3174 array_type
->encoding
, nesting
);
3182 ret
= lttng_metadata_printf(session
,
3185 array_type
->length
);
3190 * Must be called with sessions_mutex held.
3193 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3194 const struct lttng_kernel_event_field
*field
,
3196 const char *prev_field_name
)
3199 const char *length_name
;
3200 const struct lttng_kernel_type_sequence
*sequence_type
;
3201 const struct lttng_kernel_type_common
*elem_type
;
3203 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3204 WARN_ON_ONCE(!sequence_type
);
3206 length_name
= sequence_type
->length_name
;
3208 length_name
= prev_field_name
;
3212 if (sequence_type
->alignment
) {
3213 ret
= print_tabs(session
, nesting
);
3216 ret
= lttng_metadata_printf(session
,
3217 "struct { } align(%u) _%s_padding;\n",
3218 sequence_type
->alignment
* CHAR_BIT
,
3225 * Nested compound types: Only array of structures and variants are
3226 * currently supported.
3228 elem_type
= sequence_type
->elem_type
;
3229 switch (elem_type
->type
) {
3230 case lttng_kernel_type_integer
:
3231 case lttng_kernel_type_struct
:
3232 case lttng_kernel_type_variant
:
3233 ret
= _lttng_type_statedump(session
, elem_type
,
3234 sequence_type
->encoding
, nesting
);
3242 ret
= lttng_metadata_printf(session
,
3250 * Must be called with sessions_mutex held.
3253 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3254 const struct lttng_kernel_type_enum
*type
,
3257 const struct lttng_kernel_enum_desc
*enum_desc
;
3258 const struct lttng_kernel_type_common
*container_type
;
3260 unsigned int i
, nr_entries
;
3262 container_type
= type
->container_type
;
3263 if (container_type
->type
!= lttng_kernel_type_integer
) {
3267 enum_desc
= type
->desc
;
3268 nr_entries
= enum_desc
->nr_entries
;
3270 ret
= print_tabs(session
, nesting
);
3273 ret
= lttng_metadata_printf(session
, "enum : ");
3276 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3277 lttng_kernel_string_encoding_none
, 0);
3280 ret
= lttng_metadata_printf(session
, " {\n");
3283 /* Dump all entries */
3284 for (i
= 0; i
< nr_entries
; i
++) {
3285 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3288 ret
= print_tabs(session
, nesting
+ 1);
3291 ret
= lttng_metadata_printf(session
,
3295 len
= strlen(entry
->string
);
3296 /* Escape the character '"' */
3297 for (j
= 0; j
< len
; j
++) {
3298 char c
= entry
->string
[j
];
3302 ret
= lttng_metadata_printf(session
,
3306 ret
= lttng_metadata_printf(session
,
3310 ret
= lttng_metadata_printf(session
,
3317 ret
= lttng_metadata_printf(session
, "\"");
3321 if (entry
->options
.is_auto
) {
3322 ret
= lttng_metadata_printf(session
, ",\n");
3326 ret
= lttng_metadata_printf(session
,
3330 if (entry
->start
.signedness
)
3331 ret
= lttng_metadata_printf(session
,
3332 "%lld", (long long) entry
->start
.value
);
3334 ret
= lttng_metadata_printf(session
,
3335 "%llu", entry
->start
.value
);
3338 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3340 == entry
->end
.value
) {
3341 ret
= lttng_metadata_printf(session
,
3344 if (entry
->end
.signedness
) {
3345 ret
= lttng_metadata_printf(session
,
3347 (long long) entry
->end
.value
);
3349 ret
= lttng_metadata_printf(session
,
3358 ret
= print_tabs(session
, nesting
);
3361 ret
= lttng_metadata_printf(session
, "}");
3367 * Must be called with sessions_mutex held.
3370 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3371 const struct lttng_kernel_event_field
*field
,
3375 const struct lttng_kernel_type_enum
*enum_type
;
3377 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3378 WARN_ON_ONCE(!enum_type
);
3379 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3382 return lttng_field_name_statedump(session
, field
, nesting
);
3386 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3387 const struct lttng_kernel_event_field
*field
,
3392 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3393 lttng_kernel_string_encoding_none
, nesting
);
3396 return lttng_field_name_statedump(session
, field
, nesting
);
3400 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3401 const struct lttng_kernel_type_string
*type
,
3406 /* Default encoding is UTF8 */
3407 ret
= print_tabs(session
, nesting
);
3410 ret
= lttng_metadata_printf(session
,
3412 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3413 " { encoding = ASCII; }" : "");
3418 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3419 const struct lttng_kernel_event_field
*field
,
3422 const struct lttng_kernel_type_string
*string_type
;
3425 string_type
= lttng_kernel_get_type_string(field
->type
);
3426 WARN_ON_ONCE(!string_type
);
3427 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3430 return lttng_field_name_statedump(session
, field
, nesting
);
3434 * Must be called with sessions_mutex held.
3437 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3438 const struct lttng_kernel_type_common
*type
,
3439 enum lttng_kernel_string_encoding parent_encoding
,
3444 switch (type
->type
) {
3445 case lttng_kernel_type_integer
:
3446 ret
= _lttng_integer_type_statedump(session
,
3447 lttng_kernel_get_type_integer(type
),
3448 parent_encoding
, nesting
);
3450 case lttng_kernel_type_enum
:
3451 ret
= _lttng_enum_type_statedump(session
,
3452 lttng_kernel_get_type_enum(type
),
3455 case lttng_kernel_type_string
:
3456 ret
= _lttng_string_type_statedump(session
,
3457 lttng_kernel_get_type_string(type
),
3460 case lttng_kernel_type_struct
:
3461 ret
= _lttng_struct_type_statedump(session
,
3462 lttng_kernel_get_type_struct(type
),
3465 case lttng_kernel_type_variant
:
3466 ret
= _lttng_variant_type_statedump(session
,
3467 lttng_kernel_get_type_variant(type
),
3471 /* Nested arrays and sequences are not supported yet. */
3472 case lttng_kernel_type_array
:
3473 case lttng_kernel_type_sequence
:
3482 * Must be called with sessions_mutex held.
3485 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3486 const struct lttng_kernel_event_field
*field
,
3488 const char **prev_field_name_p
)
3490 const char *prev_field_name
= NULL
;
3493 if (prev_field_name_p
)
3494 prev_field_name
= *prev_field_name_p
;
3495 switch (field
->type
->type
) {
3496 case lttng_kernel_type_integer
:
3497 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3499 case lttng_kernel_type_enum
:
3500 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3502 case lttng_kernel_type_string
:
3503 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3505 case lttng_kernel_type_struct
:
3506 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3508 case lttng_kernel_type_array
:
3509 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3511 case lttng_kernel_type_sequence
:
3512 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3514 case lttng_kernel_type_variant
:
3515 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3522 if (prev_field_name_p
)
3523 *prev_field_name_p
= field
->name
;
3528 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3529 struct lttng_kernel_ctx
*ctx
)
3531 const char *prev_field_name
= NULL
;
3537 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3538 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3540 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3548 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3549 struct lttng_kernel_event_recorder
*event_recorder
)
3551 const char *prev_field_name
= NULL
;
3552 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3556 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3557 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3559 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3567 * Must be called with sessions_mutex held.
3568 * The entire event metadata is printed as a single atomic metadata
3572 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3573 struct lttng_kernel_channel_buffer
*chan
,
3574 struct lttng_kernel_event_recorder
*event_recorder
)
3578 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3580 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3583 lttng_metadata_begin(session
);
3585 ret
= lttng_metadata_printf(session
,
3589 " stream_id = %u;\n",
3590 event_recorder
->priv
->parent
.desc
->event_name
,
3591 event_recorder
->priv
->id
,
3592 event_recorder
->chan
->priv
->id
);
3596 ret
= lttng_metadata_printf(session
,
3597 " fields := struct {\n"
3602 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3607 * LTTng space reservation can only reserve multiples of the
3610 ret
= lttng_metadata_printf(session
,
3616 event_recorder
->priv
->metadata_dumped
= 1;
3618 lttng_metadata_end(session
);
3624 * Must be called with sessions_mutex held.
3625 * The entire channel metadata is printed as a single atomic metadata
3629 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3630 struct lttng_kernel_channel_buffer
*chan
)
3634 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3637 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3640 lttng_metadata_begin(session
);
3642 WARN_ON_ONCE(!chan
->priv
->header_type
);
3643 ret
= lttng_metadata_printf(session
,
3646 " event.header := %s;\n"
3647 " packet.context := struct packet_context;\n",
3649 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3650 "struct event_header_large");
3654 if (chan
->priv
->ctx
) {
3655 ret
= lttng_metadata_printf(session
,
3656 " event.context := struct {\n");
3660 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3663 if (chan
->priv
->ctx
) {
3664 ret
= lttng_metadata_printf(session
,
3670 ret
= lttng_metadata_printf(session
,
3673 chan
->priv
->metadata_dumped
= 1;
3675 lttng_metadata_end(session
);
3680 * Must be called with sessions_mutex held.
3683 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3685 return lttng_metadata_printf(session
,
3686 "struct packet_context {\n"
3687 " uint64_clock_monotonic_t timestamp_begin;\n"
3688 " uint64_clock_monotonic_t timestamp_end;\n"
3689 " uint64_t content_size;\n"
3690 " uint64_t packet_size;\n"
3691 " uint64_t packet_seq_num;\n"
3692 " unsigned long events_discarded;\n"
3693 " uint32_t cpu_id;\n"
3700 * id: range: 0 - 30.
3701 * id 31 is reserved to indicate an extended header.
3704 * id: range: 0 - 65534.
3705 * id 65535 is reserved to indicate an extended header.
3707 * Must be called with sessions_mutex held.
3710 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3712 return lttng_metadata_printf(session
,
3713 "struct event_header_compact {\n"
3714 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3717 " uint27_clock_monotonic_t timestamp;\n"
3721 " uint64_clock_monotonic_t timestamp;\n"
3726 "struct event_header_large {\n"
3727 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3730 " uint32_clock_monotonic_t timestamp;\n"
3734 " uint64_clock_monotonic_t timestamp;\n"
3738 lttng_alignof(uint32_t) * CHAR_BIT
,
3739 lttng_alignof(uint16_t) * CHAR_BIT
3744 * Approximation of NTP time of day to clock monotonic correlation,
3745 * taken at start of trace.
3746 * Yes, this is only an approximation. Yes, we can (and will) do better
3747 * in future versions.
3748 * This function may return a negative offset. It may happen if the
3749 * system sets the REALTIME clock to 0 after boot.
3751 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3755 int64_t measure_clock_offset(void)
3757 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3758 uint64_t tcf
= trace_clock_freq();
3760 unsigned long flags
;
3761 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3762 struct timespec64 rts
= { 0, 0 };
3764 struct timespec rts
= { 0, 0 };
3767 /* Disable interrupts to increase correlation precision. */
3768 local_irq_save(flags
);
3769 monotonic
[0] = trace_clock_read64();
3770 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3771 ktime_get_real_ts64(&rts
);
3773 getnstimeofday(&rts
);
3775 monotonic
[1] = trace_clock_read64();
3776 local_irq_restore(flags
);
3778 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3779 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3780 if (tcf
== NSEC_PER_SEC
) {
3781 realtime
+= rts
.tv_nsec
;
3783 uint64_t n
= rts
.tv_nsec
* tcf
;
3785 do_div(n
, NSEC_PER_SEC
);
3788 offset
= (int64_t) realtime
- monotonic_avg
;
3793 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3801 while (cur
!= '\0') {
3804 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3808 ret
= lttng_metadata_printf(session
, "%c", '\\');
3811 /* We still print the current char */
3814 ret
= lttng_metadata_printf(session
, "%c", cur
);
3828 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3829 const char *field_value
)
3833 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3837 ret
= print_escaped_ctf_string(session
, field_value
);
3841 ret
= lttng_metadata_printf(session
, "\";\n");
3848 * Output metadata into this session's metadata buffers.
3849 * Must be called with sessions_mutex held.
3852 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3854 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3855 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3856 const char *product_uuid
;
3857 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3858 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3861 if (!LTTNG_READ_ONCE(session
->active
))
3864 lttng_metadata_begin(session
);
3866 if (session
->priv
->metadata_dumped
)
3869 snprintf(uuid_s
, sizeof(uuid_s
),
3870 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3871 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3872 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3873 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3874 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3876 ret
= lttng_metadata_printf(session
,
3877 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3878 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3879 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3880 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3881 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3882 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3883 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3889 " byte_order = %s;\n"
3890 " packet.header := struct {\n"
3891 " uint32_t magic;\n"
3892 " uint8_t uuid[16];\n"
3893 " uint32_t stream_id;\n"
3894 " uint64_t stream_instance_id;\n"
3897 lttng_alignof(uint8_t) * CHAR_BIT
,
3898 lttng_alignof(uint16_t) * CHAR_BIT
,
3899 lttng_alignof(uint32_t) * CHAR_BIT
,
3900 lttng_alignof(uint64_t) * CHAR_BIT
,
3901 sizeof(unsigned long) * CHAR_BIT
,
3902 lttng_alignof(unsigned long) * CHAR_BIT
,
3906 #if __BYTE_ORDER == __BIG_ENDIAN
3915 ret
= lttng_metadata_printf(session
,
3917 " hostname = \"%s\";\n"
3918 " domain = \"kernel\";\n"
3919 " sysname = \"%s\";\n"
3920 " kernel_release = \"%s\";\n"
3921 " kernel_version = \"%s\";\n"
3922 " tracer_name = \"lttng-modules\";\n"
3923 " tracer_major = %d;\n"
3924 " tracer_minor = %d;\n"
3925 " tracer_patchlevel = %d;\n"
3926 " trace_buffering_scheme = \"global\";\n",
3927 current
->nsproxy
->uts_ns
->name
.nodename
,
3931 LTTNG_MODULES_MAJOR_VERSION
,
3932 LTTNG_MODULES_MINOR_VERSION
,
3933 LTTNG_MODULES_PATCHLEVEL_VERSION
3938 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3941 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3942 session
->priv
->creation_time
);
3946 /* Add the product UUID to the 'env' section */
3947 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3949 ret
= lttng_metadata_printf(session
,
3950 " product_uuid = \"%s\";\n",
3957 /* Close the 'env' section */
3958 ret
= lttng_metadata_printf(session
, "};\n\n");
3962 ret
= lttng_metadata_printf(session
,
3964 " name = \"%s\";\n",
3970 if (!trace_clock_uuid(clock_uuid_s
)) {
3971 ret
= lttng_metadata_printf(session
,
3972 " uuid = \"%s\";\n",
3979 ret
= lttng_metadata_printf(session
,
3980 " description = \"%s\";\n"
3981 " freq = %llu; /* Frequency, in Hz */\n"
3982 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3985 trace_clock_description(),
3986 (unsigned long long) trace_clock_freq(),
3987 (long long) measure_clock_offset()
3992 ret
= lttng_metadata_printf(session
,
3993 "typealias integer {\n"
3994 " size = 27; align = 1; signed = false;\n"
3995 " map = clock.%s.value;\n"
3996 "} := uint27_clock_monotonic_t;\n"
3998 "typealias integer {\n"
3999 " size = 32; align = %u; signed = false;\n"
4000 " map = clock.%s.value;\n"
4001 "} := uint32_clock_monotonic_t;\n"
4003 "typealias integer {\n"
4004 " size = 64; align = %u; signed = false;\n"
4005 " map = clock.%s.value;\n"
4006 "} := uint64_clock_monotonic_t;\n\n",
4008 lttng_alignof(uint32_t) * CHAR_BIT
,
4010 lttng_alignof(uint64_t) * CHAR_BIT
,
4016 ret
= _lttng_stream_packet_context_declare(session
);
4020 ret
= _lttng_event_header_declare(session
);
4025 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4026 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4031 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4032 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4033 event_recorder_priv
->pub
);
4037 session
->priv
->metadata_dumped
= 1;
4039 lttng_metadata_end(session
);
4044 * lttng_transport_register - LTT transport registration
4045 * @transport: transport structure
4047 * Registers a transport which can be used as output to extract the data out of
4048 * LTTng. The module calling this registration function must ensure that no
4049 * trap-inducing code will be executed by the transport functions. E.g.
4050 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4051 * is made visible to the transport function. This registration acts as a
4052 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4053 * after its registration must it synchronize the TLBs.
4055 void lttng_transport_register(struct lttng_transport
*transport
)
4058 * Make sure no page fault can be triggered by the module about to be
4059 * registered. We deal with this here so we don't have to call
4060 * vmalloc_sync_mappings() in each module's init.
4062 wrapper_vmalloc_sync_mappings();
4064 mutex_lock(&sessions_mutex
);
4065 list_add_tail(&transport
->node
, <tng_transport_list
);
4066 mutex_unlock(&sessions_mutex
);
4068 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4071 * lttng_transport_unregister - LTT transport unregistration
4072 * @transport: transport structure
4074 void lttng_transport_unregister(struct lttng_transport
*transport
)
4076 mutex_lock(&sessions_mutex
);
4077 list_del(&transport
->node
);
4078 mutex_unlock(&sessions_mutex
);
4080 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4082 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4085 * Make sure no page fault can be triggered by the module about to be
4086 * registered. We deal with this here so we don't have to call
4087 * vmalloc_sync_mappings() in each module's init.
4089 wrapper_vmalloc_sync_mappings();
4091 mutex_lock(&sessions_mutex
);
4092 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4093 mutex_unlock(&sessions_mutex
);
4095 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4097 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4099 mutex_lock(&sessions_mutex
);
4100 list_del(&transport
->node
);
4101 mutex_unlock(&sessions_mutex
);
4103 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4105 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4107 enum cpuhp_state lttng_hp_prepare
;
4108 enum cpuhp_state lttng_hp_online
;
4110 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4112 struct lttng_cpuhp_node
*lttng_node
;
4114 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4115 switch (lttng_node
->component
) {
4116 case LTTNG_RING_BUFFER_FRONTEND
:
4118 case LTTNG_RING_BUFFER_BACKEND
:
4119 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4120 case LTTNG_RING_BUFFER_ITER
:
4122 case LTTNG_CONTEXT_PERF_COUNTERS
:
4129 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4131 struct lttng_cpuhp_node
*lttng_node
;
4133 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4134 switch (lttng_node
->component
) {
4135 case LTTNG_RING_BUFFER_FRONTEND
:
4136 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4137 case LTTNG_RING_BUFFER_BACKEND
:
4139 case LTTNG_RING_BUFFER_ITER
:
4141 case LTTNG_CONTEXT_PERF_COUNTERS
:
4142 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4148 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4150 struct lttng_cpuhp_node
*lttng_node
;
4152 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4153 switch (lttng_node
->component
) {
4154 case LTTNG_RING_BUFFER_FRONTEND
:
4155 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4156 case LTTNG_RING_BUFFER_BACKEND
:
4158 case LTTNG_RING_BUFFER_ITER
:
4159 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4160 case LTTNG_CONTEXT_PERF_COUNTERS
:
4161 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4167 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4169 struct lttng_cpuhp_node
*lttng_node
;
4171 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4172 switch (lttng_node
->component
) {
4173 case LTTNG_RING_BUFFER_FRONTEND
:
4174 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4175 case LTTNG_RING_BUFFER_BACKEND
:
4177 case LTTNG_RING_BUFFER_ITER
:
4179 case LTTNG_CONTEXT_PERF_COUNTERS
:
4186 static int __init
lttng_init_cpu_hotplug(void)
4190 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4191 lttng_hotplug_prepare
,
4192 lttng_hotplug_dead
);
4196 lttng_hp_prepare
= ret
;
4197 lttng_rb_set_hp_prepare(ret
);
4199 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4200 lttng_hotplug_online
,
4201 lttng_hotplug_offline
);
4203 cpuhp_remove_multi_state(lttng_hp_prepare
);
4204 lttng_hp_prepare
= 0;
4207 lttng_hp_online
= ret
;
4208 lttng_rb_set_hp_online(ret
);
4213 static void __exit
lttng_exit_cpu_hotplug(void)
4215 lttng_rb_set_hp_online(0);
4216 cpuhp_remove_multi_state(lttng_hp_online
);
4217 lttng_rb_set_hp_prepare(0);
4218 cpuhp_remove_multi_state(lttng_hp_prepare
);
4221 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4222 static int lttng_init_cpu_hotplug(void)
4226 static void lttng_exit_cpu_hotplug(void)
4229 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4231 static int __init
lttng_events_init(void)
4235 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4238 ret
= wrapper_get_pfnblock_flags_mask_init();
4241 ret
= wrapper_get_pageblock_flags_mask_init();
4244 ret
= lttng_probes_init();
4247 ret
= lttng_context_init();
4250 ret
= lttng_tracepoint_init();
4253 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4254 if (!event_recorder_cache
) {
4256 goto error_kmem_event_recorder
;
4258 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4259 if (!event_recorder_private_cache
) {
4261 goto error_kmem_event_recorder_private
;
4263 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4264 if (!event_notifier_cache
) {
4266 goto error_kmem_event_notifier
;
4268 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4269 if (!event_notifier_private_cache
) {
4271 goto error_kmem_event_notifier_private
;
4273 ret
= lttng_abi_init();
4276 ret
= lttng_logger_init();
4279 ret
= lttng_init_cpu_hotplug();
4282 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4283 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4284 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4285 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4286 LTTNG_MODULES_EXTRAVERSION
,
4288 #ifdef LTTNG_EXTRA_VERSION_GIT
4289 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4293 #ifdef LTTNG_EXTRA_VERSION_NAME
4294 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4298 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4299 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4300 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4304 lttng_logger_exit();
4308 kmem_cache_destroy(event_notifier_private_cache
);
4309 error_kmem_event_notifier_private
:
4310 kmem_cache_destroy(event_notifier_cache
);
4311 error_kmem_event_notifier
:
4312 kmem_cache_destroy(event_recorder_private_cache
);
4313 error_kmem_event_recorder_private
:
4314 kmem_cache_destroy(event_recorder_cache
);
4315 error_kmem_event_recorder
:
4316 lttng_tracepoint_exit();
4318 lttng_context_exit();
4319 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4320 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4321 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4322 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4323 LTTNG_MODULES_EXTRAVERSION
,
4325 #ifdef LTTNG_EXTRA_VERSION_GIT
4326 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4330 #ifdef LTTNG_EXTRA_VERSION_NAME
4331 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4338 module_init(lttng_events_init
);
4340 static void __exit
lttng_events_exit(void)
4342 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4344 lttng_exit_cpu_hotplug();
4345 lttng_logger_exit();
4347 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4348 lttng_session_destroy(session_priv
->pub
);
4349 kmem_cache_destroy(event_recorder_cache
);
4350 kmem_cache_destroy(event_recorder_private_cache
);
4351 kmem_cache_destroy(event_notifier_cache
);
4352 kmem_cache_destroy(event_notifier_private_cache
);
4353 lttng_tracepoint_exit();
4354 lttng_context_exit();
4355 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4356 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4357 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4358 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4359 LTTNG_MODULES_EXTRAVERSION
,
4361 #ifdef LTTNG_EXTRA_VERSION_GIT
4362 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4366 #ifdef LTTNG_EXTRA_VERSION_NAME
4367 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4373 module_exit(lttng_events_exit
);
4375 #include <generated/patches.h>
4376 #ifdef LTTNG_EXTRA_VERSION_GIT
4377 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4379 #ifdef LTTNG_EXTRA_VERSION_NAME
4380 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4382 MODULE_LICENSE("GPL and additional rights");
4383 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4384 MODULE_DESCRIPTION("LTTng tracer");
4385 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4386 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4387 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4388 LTTNG_MODULES_EXTRAVERSION
);