1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/compiler_attributes.h>
32 #include <wrapper/uuid.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng/kernel-version.h>
39 #include <lttng/events.h>
40 #include <lttng/events-internal.h>
41 #include <lttng/lttng-bytecode.h>
42 #include <lttng/tracer.h>
43 #include <lttng/event-notifier-notification.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/endian.h>
46 #include <lttng/string-utils.h>
47 #include <lttng/utils.h>
48 #include <ringbuffer/backend.h>
49 #include <ringbuffer/frontend.h>
50 #include <wrapper/time.h>
52 #define METADATA_CACHE_DEFAULT_SIZE 4096
54 static LIST_HEAD(sessions
);
55 static LIST_HEAD(event_notifier_groups
);
56 static LIST_HEAD(lttng_transport_list
);
57 static LIST_HEAD(lttng_counter_transport_list
);
59 * Protect the sessions and metadata caches.
61 static DEFINE_MUTEX(sessions_mutex
);
62 static struct kmem_cache
*event_recorder_cache
;
63 static struct kmem_cache
*event_recorder_private_cache
;
64 static struct kmem_cache
*event_notifier_cache
;
65 static struct kmem_cache
*event_notifier_private_cache
;
67 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
68 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
69 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
70 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
72 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
73 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
74 static int _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
76 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
77 struct lttng_kernel_channel_buffer
*chan
,
78 struct lttng_kernel_event_recorder
*event
);
80 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
82 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
84 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
85 const struct lttng_kernel_type_common
*type
,
86 enum lttng_kernel_string_encoding parent_encoding
,
89 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
90 const struct lttng_kernel_event_field
*field
,
91 size_t nesting
, const char **prev_field_name_p
);
93 void synchronize_trace(void)
95 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
96 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
102 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
103 #ifdef CONFIG_PREEMPT_RT_FULL
106 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
107 #ifdef CONFIG_PREEMPT_RT
110 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
113 void lttng_lock_sessions(void)
115 mutex_lock(&sessions_mutex
);
118 void lttng_unlock_sessions(void)
120 mutex_unlock(&sessions_mutex
);
123 static struct lttng_transport
*lttng_transport_find(const char *name
)
125 struct lttng_transport
*transport
;
127 list_for_each_entry(transport
, <tng_transport_list
, node
) {
128 if (!strcmp(transport
->name
, name
))
135 * Called with sessions lock held.
137 int lttng_session_active(void)
139 struct lttng_kernel_session_private
*iter
;
141 list_for_each_entry(iter
, &sessions
, list
) {
142 if (iter
->pub
->active
)
148 struct lttng_kernel_session
*lttng_session_create(void)
150 struct lttng_kernel_session
*session
;
151 struct lttng_kernel_session_private
*session_priv
;
152 struct lttng_metadata_cache
*metadata_cache
;
155 mutex_lock(&sessions_mutex
);
156 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
159 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
161 goto err_free_session
;
162 session
->priv
= session_priv
;
163 session_priv
->pub
= session
;
165 INIT_LIST_HEAD(&session_priv
->chan
);
166 INIT_LIST_HEAD(&session_priv
->events
);
167 lttng_guid_gen(&session_priv
->uuid
);
169 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
172 goto err_free_session_private
;
173 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
174 if (!metadata_cache
->data
)
176 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
177 kref_init(&metadata_cache
->refcount
);
178 mutex_init(&metadata_cache
->lock
);
179 session_priv
->metadata_cache
= metadata_cache
;
180 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
181 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
182 sizeof(metadata_cache
->uuid
));
183 INIT_LIST_HEAD(&session_priv
->enablers_head
);
184 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
185 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
186 list_add(&session_priv
->list
, &sessions
);
188 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
189 goto tracker_alloc_error
;
190 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
191 goto tracker_alloc_error
;
192 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
193 goto tracker_alloc_error
;
194 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
195 goto tracker_alloc_error
;
196 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
197 goto tracker_alloc_error
;
198 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
199 goto tracker_alloc_error
;
201 mutex_unlock(&sessions_mutex
);
206 lttng_id_tracker_fini(&session
->pid_tracker
);
207 lttng_id_tracker_fini(&session
->vpid_tracker
);
208 lttng_id_tracker_fini(&session
->uid_tracker
);
209 lttng_id_tracker_fini(&session
->vuid_tracker
);
210 lttng_id_tracker_fini(&session
->gid_tracker
);
211 lttng_id_tracker_fini(&session
->vgid_tracker
);
213 kfree(metadata_cache
);
214 err_free_session_private
:
215 lttng_kvfree(session_priv
);
217 lttng_kvfree(session
);
219 mutex_unlock(&sessions_mutex
);
224 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
226 struct lttng_counter_transport
*transport
;
228 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
229 if (!strcmp(transport
->name
, name
))
235 struct lttng_counter
*lttng_kernel_counter_create(
236 const char *counter_transport_name
,
237 size_t number_dimensions
, const size_t *dimensions_sizes
)
239 struct lttng_counter
*counter
= NULL
;
240 struct lttng_counter_transport
*counter_transport
= NULL
;
242 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
243 if (!counter_transport
) {
244 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
245 counter_transport_name
);
248 if (!try_module_get(counter_transport
->owner
)) {
249 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
253 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
257 /* Create event notifier error counter. */
258 counter
->ops
= &counter_transport
->ops
;
259 counter
->transport
= counter_transport
;
261 counter
->counter
= counter
->ops
->counter_create(
262 number_dimensions
, dimensions_sizes
, 0);
263 if (!counter
->counter
) {
270 lttng_kvfree(counter
);
272 if (counter_transport
)
273 module_put(counter_transport
->owner
);
278 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
280 struct lttng_transport
*transport
= NULL
;
281 struct lttng_event_notifier_group
*event_notifier_group
;
282 const char *transport_name
= "relay-event-notifier";
283 size_t subbuf_size
= 4096; //TODO
284 size_t num_subbuf
= 16; //TODO
285 unsigned int switch_timer_interval
= 0;
286 unsigned int read_timer_interval
= 0;
289 mutex_lock(&sessions_mutex
);
291 transport
= lttng_transport_find(transport_name
);
293 printk(KERN_WARNING
"LTTng: transport %s not found\n",
297 if (!try_module_get(transport
->owner
)) {
298 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
303 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
305 if (!event_notifier_group
)
309 * Initialize the ring buffer used to store event notifier
312 event_notifier_group
->ops
= &transport
->ops
;
313 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
314 transport_name
, event_notifier_group
, NULL
,
315 subbuf_size
, num_subbuf
, switch_timer_interval
,
316 read_timer_interval
);
317 if (!event_notifier_group
->chan
)
320 event_notifier_group
->transport
= transport
;
322 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
323 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
324 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
325 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
327 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
329 mutex_unlock(&sessions_mutex
);
331 return event_notifier_group
;
334 lttng_kvfree(event_notifier_group
);
337 module_put(transport
->owner
);
339 mutex_unlock(&sessions_mutex
);
343 void metadata_cache_destroy(struct kref
*kref
)
345 struct lttng_metadata_cache
*cache
=
346 container_of(kref
, struct lttng_metadata_cache
, refcount
);
351 void lttng_session_destroy(struct lttng_kernel_session
*session
)
353 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
354 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
355 struct lttng_metadata_stream
*metadata_stream
;
356 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
359 mutex_lock(&sessions_mutex
);
360 WRITE_ONCE(session
->active
, 0);
361 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
362 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
365 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
366 ret
= _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
369 synchronize_trace(); /* Wait for in-flight events to complete */
370 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
371 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
374 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
375 lttng_event_enabler_destroy(event_enabler
);
376 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
377 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
378 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
379 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
380 _lttng_channel_destroy(chan_priv
->pub
);
382 mutex_lock(&session
->priv
->metadata_cache
->lock
);
383 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
384 _lttng_metadata_channel_hangup(metadata_stream
);
385 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
386 lttng_id_tracker_fini(&session
->pid_tracker
);
387 lttng_id_tracker_fini(&session
->vpid_tracker
);
388 lttng_id_tracker_fini(&session
->uid_tracker
);
389 lttng_id_tracker_fini(&session
->vuid_tracker
);
390 lttng_id_tracker_fini(&session
->gid_tracker
);
391 lttng_id_tracker_fini(&session
->vgid_tracker
);
392 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
393 list_del(&session
->priv
->list
);
394 mutex_unlock(&sessions_mutex
);
395 lttng_kvfree(session
->priv
);
396 lttng_kvfree(session
);
399 void lttng_event_notifier_group_destroy(
400 struct lttng_event_notifier_group
*event_notifier_group
)
402 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
403 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
406 if (!event_notifier_group
)
409 mutex_lock(&sessions_mutex
);
411 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
414 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
415 &event_notifier_group
->event_notifiers_head
, parent
.node
) {
416 ret
= _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
420 /* Wait for in-flight event notifier to complete */
423 irq_work_sync(&event_notifier_group
->wakeup_pending
);
425 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
428 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
429 &event_notifier_group
->enablers_head
, node
)
430 lttng_event_enabler_destroy(event_enabler
);
432 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
433 &event_notifier_group
->event_notifiers_head
, parent
.node
)
434 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
436 if (event_notifier_group
->error_counter
) {
437 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
439 error_counter
->ops
->counter_destroy(error_counter
->counter
);
440 module_put(error_counter
->transport
->owner
);
441 lttng_kvfree(error_counter
);
442 event_notifier_group
->error_counter
= NULL
;
445 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
446 module_put(event_notifier_group
->transport
->owner
);
447 list_del(&event_notifier_group
->node
);
449 mutex_unlock(&sessions_mutex
);
450 lttng_kvfree(event_notifier_group
);
453 int lttng_session_statedump(struct lttng_kernel_session
*session
)
457 mutex_lock(&sessions_mutex
);
458 ret
= lttng_statedump_start(session
);
459 mutex_unlock(&sessions_mutex
);
463 int lttng_session_enable(struct lttng_kernel_session
*session
)
466 struct lttng_kernel_channel_buffer_private
*chan_priv
;
468 mutex_lock(&sessions_mutex
);
469 if (session
->active
) {
474 /* Set transient enabler state to "enabled" */
475 session
->priv
->tstate
= 1;
477 /* We need to sync enablers with session before activation. */
478 lttng_session_sync_event_enablers(session
);
481 * Snapshot the number of events per channel to know the type of header
484 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
485 if (chan_priv
->header_type
)
486 continue; /* don't change it if session stop/restart */
487 if (chan_priv
->free_event_id
< 31)
488 chan_priv
->header_type
= 1; /* compact */
490 chan_priv
->header_type
= 2; /* large */
493 /* Clear each stream's quiescent state. */
494 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
495 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
496 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
499 WRITE_ONCE(session
->active
, 1);
500 WRITE_ONCE(session
->priv
->been_active
, 1);
501 ret
= _lttng_session_metadata_statedump(session
);
503 WRITE_ONCE(session
->active
, 0);
506 ret
= lttng_statedump_start(session
);
508 WRITE_ONCE(session
->active
, 0);
510 mutex_unlock(&sessions_mutex
);
514 int lttng_session_disable(struct lttng_kernel_session
*session
)
517 struct lttng_kernel_channel_buffer_private
*chan_priv
;
519 mutex_lock(&sessions_mutex
);
520 if (!session
->active
) {
524 WRITE_ONCE(session
->active
, 0);
526 /* Set transient enabler state to "disabled" */
527 session
->priv
->tstate
= 0;
528 lttng_session_sync_event_enablers(session
);
530 /* Set each stream's quiescent state. */
531 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
532 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
533 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
536 mutex_unlock(&sessions_mutex
);
540 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
543 struct lttng_kernel_channel_buffer_private
*chan_priv
;
544 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
545 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
546 struct lttng_metadata_stream
*stream
;
548 mutex_lock(&sessions_mutex
);
549 if (!session
->active
) {
554 mutex_lock(&cache
->lock
);
555 memset(cache
->data
, 0, cache
->cache_alloc
);
556 cache
->metadata_written
= 0;
558 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
559 stream
->metadata_out
= 0;
560 stream
->metadata_in
= 0;
562 mutex_unlock(&cache
->lock
);
564 session
->priv
->metadata_dumped
= 0;
565 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
566 chan_priv
->metadata_dumped
= 0;
569 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
570 event_recorder_priv
->metadata_dumped
= 0;
573 ret
= _lttng_session_metadata_statedump(session
);
576 mutex_unlock(&sessions_mutex
);
581 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
583 struct lttng_kernel_channel_buffer
*chan_buf
;
585 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
587 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
588 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
593 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
597 mutex_lock(&sessions_mutex
);
598 if (is_channel_buffer_metadata(channel
)) {
602 if (channel
->enabled
) {
606 /* Set transient enabler state to "enabled" */
607 channel
->priv
->tstate
= 1;
608 lttng_session_sync_event_enablers(channel
->session
);
609 /* Set atomically the state to "enabled" */
610 WRITE_ONCE(channel
->enabled
, 1);
612 mutex_unlock(&sessions_mutex
);
616 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
620 mutex_lock(&sessions_mutex
);
621 if (is_channel_buffer_metadata(channel
)) {
625 if (!channel
->enabled
) {
629 /* Set atomically the state to "disabled" */
630 WRITE_ONCE(channel
->enabled
, 0);
631 /* Set transient enabler state to "enabled" */
632 channel
->priv
->tstate
= 0;
633 lttng_session_sync_event_enablers(channel
->session
);
635 mutex_unlock(&sessions_mutex
);
639 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
643 mutex_lock(&sessions_mutex
);
644 switch (event
->type
) {
645 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
647 struct lttng_kernel_event_recorder
*event_recorder
=
648 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
650 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
656 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
657 switch (event
->priv
->instrumentation
) {
658 case LTTNG_KERNEL_ABI_KRETPROBE
:
669 if (event
->enabled
) {
673 switch (event
->priv
->instrumentation
) {
674 case LTTNG_KERNEL_ABI_TRACEPOINT
:
676 case LTTNG_KERNEL_ABI_SYSCALL
:
680 case LTTNG_KERNEL_ABI_KPROBE
:
682 case LTTNG_KERNEL_ABI_UPROBE
:
683 WRITE_ONCE(event
->enabled
, 1);
686 case LTTNG_KERNEL_ABI_KRETPROBE
:
687 ret
= lttng_kretprobes_event_enable_state(event
, 1);
690 case LTTNG_KERNEL_ABI_FUNCTION
:
692 case LTTNG_KERNEL_ABI_NOOP
:
699 mutex_unlock(&sessions_mutex
);
703 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
707 mutex_lock(&sessions_mutex
);
708 switch (event
->type
) {
709 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
711 struct lttng_kernel_event_recorder
*event_recorder
=
712 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
714 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
720 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
721 switch (event
->priv
->instrumentation
) {
722 case LTTNG_KERNEL_ABI_KRETPROBE
:
733 if (!event
->enabled
) {
737 switch (event
->priv
->instrumentation
) {
738 case LTTNG_KERNEL_ABI_TRACEPOINT
:
740 case LTTNG_KERNEL_ABI_SYSCALL
:
744 case LTTNG_KERNEL_ABI_KPROBE
:
746 case LTTNG_KERNEL_ABI_UPROBE
:
747 WRITE_ONCE(event
->enabled
, 0);
750 case LTTNG_KERNEL_ABI_KRETPROBE
:
751 ret
= lttng_kretprobes_event_enable_state(event
, 0);
754 case LTTNG_KERNEL_ABI_FUNCTION
:
756 case LTTNG_KERNEL_ABI_NOOP
:
763 mutex_unlock(&sessions_mutex
);
767 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
768 const char *transport_name
,
770 size_t subbuf_size
, size_t num_subbuf
,
771 unsigned int switch_timer_interval
,
772 unsigned int read_timer_interval
,
773 enum channel_type channel_type
)
775 struct lttng_kernel_channel_buffer
*chan
;
776 struct lttng_kernel_channel_buffer_private
*chan_priv
;
777 struct lttng_transport
*transport
= NULL
;
779 mutex_lock(&sessions_mutex
);
780 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
781 goto active
; /* Refuse to add channel to active session */
782 transport
= lttng_transport_find(transport_name
);
784 printk(KERN_WARNING
"LTTng: transport %s not found\n",
788 if (!try_module_get(transport
->owner
)) {
789 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
792 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
795 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
798 chan
->priv
= chan_priv
;
799 chan_priv
->pub
= chan
;
800 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
801 chan
->parent
.session
= session
;
802 chan
->priv
->id
= session
->priv
->free_chan_id
++;
803 chan
->ops
= &transport
->ops
;
805 * Note: the channel creation op already writes into the packet
806 * headers. Therefore the "chan" information used as input
807 * should be already accessible.
809 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
810 chan
, buf_addr
, subbuf_size
, num_subbuf
,
811 switch_timer_interval
, read_timer_interval
);
812 if (!chan
->priv
->rb_chan
)
814 chan
->priv
->parent
.tstate
= 1;
815 chan
->parent
.enabled
= 1;
816 chan
->priv
->transport
= transport
;
817 chan
->priv
->channel_type
= channel_type
;
818 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
819 mutex_unlock(&sessions_mutex
);
828 module_put(transport
->owner
);
831 mutex_unlock(&sessions_mutex
);
836 * Only used internally at session destruction for per-cpu channels, and
837 * when metadata channel is released.
838 * Needs to be called with sessions mutex held.
841 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
843 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
844 module_put(chan
->priv
->transport
->owner
);
845 list_del(&chan
->priv
->node
);
846 lttng_kernel_destroy_context(chan
->priv
->ctx
);
851 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
853 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
855 /* Protect the metadata cache with the sessions_mutex. */
856 mutex_lock(&sessions_mutex
);
857 _lttng_channel_destroy(chan
);
858 mutex_unlock(&sessions_mutex
);
860 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
863 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
865 stream
->finalized
= 1;
866 wake_up_interruptible(&stream
->read_wait
);
870 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
872 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
873 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
875 switch (event_enabler
->enabler_type
) {
876 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
878 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
879 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
880 struct lttng_kernel_event_recorder
*event_recorder
;
881 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
882 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
884 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
887 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
888 if (!event_recorder_priv
) {
889 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
892 event_recorder_priv
->pub
= event_recorder
;
893 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
894 event_recorder
->priv
= event_recorder_priv
;
895 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
897 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
898 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
899 event_recorder
->priv
->parent
.instrumentation
= itype
;
900 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
901 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
903 event_recorder
->chan
= chan
;
904 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
905 return &event_recorder
->parent
;
907 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
909 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
910 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
911 struct lttng_kernel_event_notifier
*event_notifier
;
912 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
914 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
917 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
918 if (!event_notifier_priv
) {
919 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
922 event_notifier_priv
->pub
= event_notifier
;
923 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
924 event_notifier
->priv
= event_notifier_priv
;
925 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
927 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
928 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
929 event_notifier
->priv
->parent
.instrumentation
= itype
;
930 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
931 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
932 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
934 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
935 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
936 event_notifier
->priv
->num_captures
= 0;
937 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
938 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
939 return &event_notifier
->parent
;
947 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
949 switch (event
->type
) {
950 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
952 struct lttng_kernel_event_recorder
*event_recorder
=
953 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
955 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
956 kmem_cache_free(event_recorder_cache
, event_recorder
);
959 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
961 struct lttng_kernel_event_notifier
*event_notifier
=
962 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
964 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
965 kmem_cache_free(event_notifier_cache
, event_notifier
);
974 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
976 switch (event
->type
) {
977 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
979 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
981 struct lttng_kernel_event_notifier
*event_notifier
=
982 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
983 struct lttng_counter
*error_counter
;
984 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
985 size_t dimension_index
[1];
989 * Clear the error counter bucket. The sessiond keeps track of which
990 * bucket is currently in use. We trust it. The session lock
991 * synchronizes against concurrent creation of the error
994 error_counter
= event_notifier_group
->error_counter
;
998 * Check that the index is within the boundary of the counter.
1000 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1001 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1002 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1006 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1007 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1009 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1010 event_notifier
->priv
->error_counter_index
);
1021 * Supports event creation while tracing session is active.
1022 * Needs to be called with sessions mutex held.
1025 struct lttng_kernel_event_recorder
*_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler
*event_enabler
,
1026 const struct lttng_kernel_event_desc
*event_desc
)
1028 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1029 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
1030 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1031 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1032 struct lttng_kernel_event_common_private
*event_priv
;
1033 struct lttng_kernel_event_common
*event
;
1034 struct lttng_kernel_event_recorder
*event_recorder
;
1035 const char *event_name
;
1036 struct hlist_head
*head
;
1039 if (chan
->priv
->free_event_id
== -1U) {
1045 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1046 event_name
= event_desc
->event_name
;
1049 case LTTNG_KERNEL_ABI_KPROBE
:
1051 case LTTNG_KERNEL_ABI_UPROBE
:
1053 case LTTNG_KERNEL_ABI_KRETPROBE
:
1055 case LTTNG_KERNEL_ABI_SYSCALL
:
1056 event_name
= event_param
->name
;
1059 case LTTNG_KERNEL_ABI_FUNCTION
:
1061 case LTTNG_KERNEL_ABI_NOOP
:
1069 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1070 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1071 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1077 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1082 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1085 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1086 /* Event will be enabled by enabler sync. */
1088 event
->priv
->registered
= 0;
1089 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1090 if (!event
->priv
->desc
) {
1092 goto register_error
;
1094 /* Populate lttng_event structure before event registration. */
1098 case LTTNG_KERNEL_ABI_KPROBE
:
1100 * Needs to be explicitly enabled after creation, since
1101 * we may want to apply filters.
1104 event
->priv
->registered
= 1;
1106 * Populate lttng_event structure before event
1110 ret
= lttng_kprobes_register_event(event_name
,
1111 event_param
->u
.kprobe
.symbol_name
,
1112 event_param
->u
.kprobe
.offset
,
1113 event_param
->u
.kprobe
.addr
,
1117 goto register_error
;
1119 ret
= try_module_get(event
->priv
->desc
->owner
);
1123 case LTTNG_KERNEL_ABI_KRETPROBE
:
1125 struct lttng_kernel_event_common
*event_return
;
1126 struct lttng_kernel_event_recorder
*event_recorder_return
;
1128 /* kretprobe defines 2 events */
1130 * Needs to be explicitly enabled after creation, since
1131 * we may want to apply filters.
1134 event
->priv
->registered
= 1;
1136 event_return
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1141 event_recorder_return
= container_of(event_return
, struct lttng_kernel_event_recorder
, parent
);
1143 event_return
->enabled
= 0;
1144 event_return
->priv
->registered
= 1;
1147 * Populate lttng_event structure before kretprobe registration.
1150 ret
= lttng_kretprobes_register(event_name
,
1151 event_param
->u
.kretprobe
.symbol_name
,
1152 event_param
->u
.kretprobe
.offset
,
1153 event_param
->u
.kretprobe
.addr
,
1154 event
, event_return
);
1156 lttng_kernel_event_free(event_return
);
1158 goto register_error
;
1160 /* Take 2 refs on the module: one per event. */
1161 ret
= try_module_get(event
->priv
->desc
->owner
);
1163 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1165 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder_return
);
1166 WARN_ON_ONCE(ret
> 0);
1168 lttng_kernel_event_free(event_return
);
1169 module_put(event_return
->priv
->desc
->owner
);
1170 module_put(event
->priv
->desc
->owner
);
1171 goto statedump_error
;
1173 list_add(&event_return
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1177 case LTTNG_KERNEL_ABI_SYSCALL
:
1179 * Needs to be explicitly enabled after creation, since
1180 * we may want to apply filters.
1183 event
->priv
->registered
= 0;
1184 event
->priv
->desc
= event_desc
;
1185 switch (event_param
->u
.syscall
.entryexit
) {
1186 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1188 goto register_error
;
1189 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1190 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1192 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1193 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1196 switch (event_param
->u
.syscall
.abi
) {
1197 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1199 goto register_error
;
1200 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1201 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1203 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1204 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1207 if (!event
->priv
->desc
) {
1209 goto register_error
;
1213 case LTTNG_KERNEL_ABI_UPROBE
:
1215 * Needs to be explicitly enabled after creation, since
1216 * we may want to apply filters.
1219 event
->priv
->registered
= 1;
1222 * Populate lttng_event structure before event
1227 ret
= lttng_uprobes_register_event(event_param
->name
,
1228 event_param
->u
.uprobe
.fd
,
1231 goto register_error
;
1232 ret
= try_module_get(event
->priv
->desc
->owner
);
1236 case LTTNG_KERNEL_ABI_FUNCTION
:
1238 case LTTNG_KERNEL_ABI_NOOP
:
1243 goto register_error
;
1245 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1246 WARN_ON_ONCE(ret
> 0);
1248 goto statedump_error
;
1250 hlist_add_head(&event
->priv
->hlist_node
, head
);
1251 list_add(&event
->priv
->node
, &chan
->parent
.session
->priv
->events
);
1252 return event_recorder
;
1255 /* If a statedump error occurs, events will not be readable. */
1257 lttng_kernel_event_free(event
);
1262 return ERR_PTR(ret
);
1266 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1267 const struct lttng_kernel_event_desc
*event_desc
)
1269 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1270 struct lttng_event_notifier_group
*event_notifier_group
= event_enabler
->group
;
1271 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1272 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1273 struct lttng_kernel_event_common_private
*event_priv
;
1274 struct lttng_kernel_event_common
*event
;
1275 struct lttng_kernel_event_notifier
*event_notifier
;
1276 const char *event_name
;
1277 struct hlist_head
*head
;
1281 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1282 event_name
= event_desc
->event_name
;
1285 case LTTNG_KERNEL_ABI_KPROBE
:
1287 case LTTNG_KERNEL_ABI_UPROBE
:
1289 case LTTNG_KERNEL_ABI_SYSCALL
:
1290 event_name
= event_param
->name
;
1293 case LTTNG_KERNEL_ABI_KRETPROBE
:
1295 case LTTNG_KERNEL_ABI_FUNCTION
:
1297 case LTTNG_KERNEL_ABI_NOOP
:
1305 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1306 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1307 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1313 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1318 event_notifier
= container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1321 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1322 /* Event will be enabled by enabler sync. */
1324 event
->priv
->registered
= 0;
1325 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1326 if (!event
->priv
->desc
) {
1328 goto register_error
;
1330 /* Populate lttng_event_notifier structure before event registration. */
1334 case LTTNG_KERNEL_ABI_KPROBE
:
1336 * Needs to be explicitly enabled after creation, since
1337 * we may want to apply filters.
1340 event
->priv
->registered
= 1;
1342 * Populate lttng_event_notifier structure before event
1346 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1347 event_param
->u
.kprobe
.symbol_name
,
1348 event_param
->u
.kprobe
.offset
,
1349 event_param
->u
.kprobe
.addr
,
1353 goto register_error
;
1355 ret
= try_module_get(event
->priv
->desc
->owner
);
1359 case LTTNG_KERNEL_ABI_SYSCALL
:
1361 * Needs to be explicitly enabled after creation, since
1362 * we may want to apply filters.
1365 event
->priv
->registered
= 0;
1366 event
->priv
->desc
= event_desc
;
1367 switch (event_param
->u
.syscall
.entryexit
) {
1368 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1370 goto register_error
;
1371 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1372 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1374 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1375 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1378 switch (event_param
->u
.syscall
.abi
) {
1379 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1381 goto register_error
;
1382 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1383 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1385 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1386 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1390 if (!event
->priv
->desc
) {
1392 goto register_error
;
1396 case LTTNG_KERNEL_ABI_UPROBE
:
1398 * Needs to be explicitly enabled after creation, since
1399 * we may want to apply filters.
1402 event
->priv
->registered
= 1;
1405 * Populate lttng_event_notifier structure before
1406 * event_notifier registration.
1410 ret
= lttng_uprobes_register_event(event_param
->name
,
1411 event_param
->u
.uprobe
.fd
,
1414 goto register_error
;
1415 ret
= try_module_get(event
->priv
->desc
->owner
);
1419 case LTTNG_KERNEL_ABI_KRETPROBE
:
1421 case LTTNG_KERNEL_ABI_FUNCTION
:
1423 case LTTNG_KERNEL_ABI_NOOP
:
1428 goto register_error
;
1431 list_add(&event
->priv
->node
, &event_notifier_group
->event_notifiers_head
);
1432 hlist_add_head(&event
->priv
->hlist_node
, head
);
1434 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1436 goto register_error
;
1437 return event_notifier
;
1440 lttng_kernel_event_free(event
);
1444 return ERR_PTR(ret
);
1447 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1448 const struct lttng_kernel_event_desc
*event_desc
)
1450 switch (event_enabler
->enabler_type
) {
1451 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1453 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1454 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1455 struct lttng_kernel_event_recorder
*event_recorder
;
1457 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1458 if (!event_recorder
)
1460 return &event_recorder
->parent
;
1462 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1464 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1465 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1466 struct lttng_kernel_event_notifier
*event_notifier
;
1468 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1469 if (!event_notifier
)
1471 return &event_notifier
->parent
;
1478 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1479 const struct lttng_kernel_event_desc
*event_desc
)
1481 struct lttng_kernel_event_common
*event
;
1483 mutex_lock(&sessions_mutex
);
1484 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1485 mutex_unlock(&sessions_mutex
);
1491 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1492 const size_t *dim_indexes
, int32_t cpu
,
1493 int64_t *val
, bool *overflow
, bool *underflow
)
1495 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1496 cpu
, val
, overflow
, underflow
);
1499 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1500 const size_t *dim_indexes
, int64_t *val
,
1501 bool *overflow
, bool *underflow
)
1503 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1504 val
, overflow
, underflow
);
1507 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1508 const size_t *dim_indexes
)
1510 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1513 /* Only used for tracepoints for now. */
1515 void register_event(struct lttng_kernel_event_common
*event
)
1517 const struct lttng_kernel_event_desc
*desc
;
1520 if (event
->priv
->registered
)
1523 desc
= event
->priv
->desc
;
1524 switch (event
->priv
->instrumentation
) {
1525 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1526 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1527 desc
->tp_class
->probe_callback
,
1531 case LTTNG_KERNEL_ABI_SYSCALL
:
1532 ret
= lttng_syscall_filter_enable_event(event
);
1535 case LTTNG_KERNEL_ABI_KPROBE
:
1537 case LTTNG_KERNEL_ABI_UPROBE
:
1541 case LTTNG_KERNEL_ABI_KRETPROBE
:
1542 switch (event
->type
) {
1543 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1546 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1552 case LTTNG_KERNEL_ABI_FUNCTION
:
1554 case LTTNG_KERNEL_ABI_NOOP
:
1560 event
->priv
->registered
= 1;
1563 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1565 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1566 const struct lttng_kernel_event_desc
*desc
;
1569 if (!event_priv
->registered
)
1572 desc
= event_priv
->desc
;
1573 switch (event_priv
->instrumentation
) {
1574 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1575 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1576 event_priv
->desc
->tp_class
->probe_callback
,
1580 case LTTNG_KERNEL_ABI_KPROBE
:
1581 lttng_kprobes_unregister_event(event
);
1585 case LTTNG_KERNEL_ABI_KRETPROBE
:
1586 switch (event
->type
) {
1587 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1588 lttng_kretprobes_unregister(event
);
1591 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1597 case LTTNG_KERNEL_ABI_SYSCALL
:
1598 ret
= lttng_syscall_filter_disable_event(event
);
1601 case LTTNG_KERNEL_ABI_NOOP
:
1602 switch (event
->type
) {
1603 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1606 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1612 case LTTNG_KERNEL_ABI_UPROBE
:
1613 lttng_uprobes_unregister_event(event
);
1617 case LTTNG_KERNEL_ABI_FUNCTION
:
1623 event_priv
->registered
= 0;
1628 * Only used internally at session destruction.
1631 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1633 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1634 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1636 lttng_free_event_filter_runtime(event
);
1637 /* Free event enabler refs */
1638 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1639 &event_priv
->enablers_ref_head
, node
)
1642 switch (event
->type
) {
1643 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1645 struct lttng_kernel_event_recorder
*event_recorder
=
1646 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1648 switch (event_priv
->instrumentation
) {
1649 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1650 lttng_event_desc_put(event_priv
->desc
);
1653 case LTTNG_KERNEL_ABI_KPROBE
:
1654 module_put(event_priv
->desc
->owner
);
1655 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1658 case LTTNG_KERNEL_ABI_KRETPROBE
:
1659 module_put(event_priv
->desc
->owner
);
1660 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1663 case LTTNG_KERNEL_ABI_SYSCALL
:
1666 case LTTNG_KERNEL_ABI_UPROBE
:
1667 module_put(event_priv
->desc
->owner
);
1668 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1671 case LTTNG_KERNEL_ABI_FUNCTION
:
1673 case LTTNG_KERNEL_ABI_NOOP
:
1678 list_del(&event_recorder
->priv
->parent
.node
);
1679 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1680 kmem_cache_free(event_recorder_cache
, event_recorder
);
1683 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1685 struct lttng_kernel_event_notifier
*event_notifier
=
1686 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1688 switch (event_notifier
->priv
->parent
.instrumentation
) {
1689 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1690 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1693 case LTTNG_KERNEL_ABI_KPROBE
:
1694 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1695 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1698 case LTTNG_KERNEL_ABI_SYSCALL
:
1701 case LTTNG_KERNEL_ABI_UPROBE
:
1702 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1703 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1706 case LTTNG_KERNEL_ABI_KRETPROBE
:
1708 case LTTNG_KERNEL_ABI_FUNCTION
:
1710 case LTTNG_KERNEL_ABI_NOOP
:
1715 list_del(&event_notifier
->priv
->parent
.node
);
1716 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1717 kmem_cache_free(event_notifier_cache
, event_notifier
);
1725 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1726 enum tracker_type tracker_type
)
1728 switch (tracker_type
) {
1730 return &session
->pid_tracker
;
1732 return &session
->vpid_tracker
;
1734 return &session
->uid_tracker
;
1736 return &session
->vuid_tracker
;
1738 return &session
->gid_tracker
;
1740 return &session
->vgid_tracker
;
1747 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1748 enum tracker_type tracker_type
, int id
)
1750 struct lttng_kernel_id_tracker
*tracker
;
1753 tracker
= get_tracker(session
, tracker_type
);
1758 mutex_lock(&sessions_mutex
);
1760 /* track all ids: destroy tracker. */
1761 lttng_id_tracker_destroy(tracker
, true);
1764 ret
= lttng_id_tracker_add(tracker
, id
);
1766 mutex_unlock(&sessions_mutex
);
1770 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1771 enum tracker_type tracker_type
, int id
)
1773 struct lttng_kernel_id_tracker
*tracker
;
1776 tracker
= get_tracker(session
, tracker_type
);
1781 mutex_lock(&sessions_mutex
);
1783 /* untrack all ids: replace by empty tracker. */
1784 ret
= lttng_id_tracker_empty_set(tracker
);
1786 ret
= lttng_id_tracker_del(tracker
, id
);
1788 mutex_unlock(&sessions_mutex
);
1793 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1795 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1796 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1797 struct lttng_id_hash_node
*e
;
1800 mutex_lock(&sessions_mutex
);
1802 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1803 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1805 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1811 /* ID tracker disabled. */
1812 if (iter
>= *pos
&& iter
== 0) {
1813 return id_tracker_p
; /* empty tracker */
1821 /* Called with sessions_mutex held. */
1823 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1825 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1826 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1827 struct lttng_id_hash_node
*e
;
1832 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1833 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1835 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1836 if (iter
++ >= *ppos
)
1841 /* ID tracker disabled. */
1842 if (iter
>= *ppos
&& iter
== 0)
1843 return p
; /* empty tracker */
1852 void id_list_stop(struct seq_file
*m
, void *p
)
1854 mutex_unlock(&sessions_mutex
);
1858 int id_list_show(struct seq_file
*m
, void *p
)
1860 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1861 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1864 if (p
== id_tracker_p
) {
1865 /* Tracker disabled. */
1868 const struct lttng_id_hash_node
*e
= p
;
1870 id
= lttng_id_tracker_get_node_id(e
);
1872 switch (id_tracker
->priv
->tracker_type
) {
1874 seq_printf(m
, "process { pid = %d; };\n", id
);
1877 seq_printf(m
, "process { vpid = %d; };\n", id
);
1880 seq_printf(m
, "user { uid = %d; };\n", id
);
1883 seq_printf(m
, "user { vuid = %d; };\n", id
);
1886 seq_printf(m
, "group { gid = %d; };\n", id
);
1889 seq_printf(m
, "group { vgid = %d; };\n", id
);
1892 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1898 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1899 .start
= id_list_start
,
1900 .next
= id_list_next
,
1901 .stop
= id_list_stop
,
1902 .show
= id_list_show
,
1906 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1908 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1912 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1914 struct seq_file
*m
= file
->private_data
;
1915 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1918 WARN_ON_ONCE(!id_tracker
);
1919 ret
= seq_release(inode
, file
);
1921 fput(id_tracker
->priv
->session
->priv
->file
);
1925 const struct file_operations lttng_tracker_ids_list_fops
= {
1926 .owner
= THIS_MODULE
,
1927 .open
= lttng_tracker_ids_list_open
,
1929 .llseek
= seq_lseek
,
1930 .release
= lttng_tracker_ids_list_release
,
1933 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1934 enum tracker_type tracker_type
)
1936 struct file
*tracker_ids_list_file
;
1940 file_fd
= lttng_get_unused_fd();
1946 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1947 <tng_tracker_ids_list_fops
,
1949 if (IS_ERR(tracker_ids_list_file
)) {
1950 ret
= PTR_ERR(tracker_ids_list_file
);
1953 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1955 goto refcount_error
;
1957 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1960 m
= tracker_ids_list_file
->private_data
;
1962 m
->private = get_tracker(session
, tracker_type
);
1963 BUG_ON(!m
->private);
1964 fd_install(file_fd
, tracker_ids_list_file
);
1969 atomic_long_dec(&session
->priv
->file
->f_count
);
1971 fput(tracker_ids_list_file
);
1973 put_unused_fd(file_fd
);
1979 * Enabler management.
1982 int lttng_match_enabler_star_glob(const char *desc_name
,
1983 const char *pattern
)
1985 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1986 desc_name
, LTTNG_SIZE_MAX
))
1992 int lttng_match_enabler_name(const char *desc_name
,
1995 if (strcmp(desc_name
, name
))
2001 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
2002 struct lttng_event_enabler_common
*enabler
)
2004 const char *desc_name
, *enabler_name
;
2005 bool compat
= false, entry
= false;
2007 enabler_name
= enabler
->event_param
.name
;
2008 switch (enabler
->event_param
.instrumentation
) {
2009 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2010 desc_name
= desc
->event_name
;
2011 switch (enabler
->format_type
) {
2012 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2013 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2014 case LTTNG_ENABLER_FORMAT_NAME
:
2015 return lttng_match_enabler_name(desc_name
, enabler_name
);
2021 case LTTNG_KERNEL_ABI_SYSCALL
:
2022 desc_name
= desc
->event_name
;
2023 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2024 desc_name
+= strlen("compat_");
2027 if (!strncmp(desc_name
, "syscall_exit_",
2028 strlen("syscall_exit_"))) {
2029 desc_name
+= strlen("syscall_exit_");
2030 } else if (!strncmp(desc_name
, "syscall_entry_",
2031 strlen("syscall_entry_"))) {
2032 desc_name
+= strlen("syscall_entry_");
2038 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2039 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2041 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2045 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2052 switch (enabler
->event_param
.u
.syscall
.abi
) {
2053 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2055 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2059 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2066 switch (enabler
->event_param
.u
.syscall
.match
) {
2067 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2068 switch (enabler
->format_type
) {
2069 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2070 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2071 case LTTNG_ENABLER_FORMAT_NAME
:
2072 return lttng_match_enabler_name(desc_name
, enabler_name
);
2077 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2078 return -EINVAL
; /* Not implemented. */
2090 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2091 struct lttng_event_enabler_common
*enabler
)
2095 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2103 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2104 struct lttng_kernel_event_common
*event
)
2106 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2109 switch (event_enabler
->enabler_type
) {
2110 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2112 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2113 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2114 struct lttng_kernel_event_recorder
*event_recorder
=
2115 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2117 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2118 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2123 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2125 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2126 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2127 struct lttng_kernel_event_notifier
*event_notifier
=
2128 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2130 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2131 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2132 && event
->priv
->user_token
== event_enabler
->user_token
)
2143 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2144 const struct lttng_kernel_event_desc
*desc
,
2145 struct lttng_kernel_event_common
*event
)
2147 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2150 switch (event_enabler
->enabler_type
) {
2151 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2153 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2154 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2155 struct lttng_kernel_event_recorder
*event_recorder
=
2156 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2158 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2163 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2165 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2166 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2167 struct lttng_kernel_event_notifier
*event_notifier
=
2168 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2170 if (event
->priv
->desc
== desc
2171 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2172 && event
->priv
->user_token
== event_enabler
->user_token
)
2183 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2184 const char *event_name
,
2185 struct lttng_kernel_event_common
*event
)
2187 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2190 switch (event_enabler
->enabler_type
) {
2191 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2193 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2194 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2195 struct lttng_kernel_event_recorder
*event_recorder
=
2196 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2198 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2199 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2204 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2206 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2207 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2208 struct lttng_kernel_event_notifier
*event_notifier
=
2209 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2211 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2212 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2213 && event
->priv
->user_token
== event_enabler
->user_token
)
2225 struct lttng_enabler_ref
*lttng_enabler_ref(
2226 struct list_head
*enablers_ref_list
,
2227 struct lttng_event_enabler_common
*enabler
)
2229 struct lttng_enabler_ref
*enabler_ref
;
2231 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2232 if (enabler_ref
->ref
== enabler
)
2239 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2241 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2242 struct lttng_kernel_probe_desc
*probe_desc
;
2243 const struct lttng_kernel_event_desc
*desc
;
2244 struct list_head
*probe_list
;
2247 probe_list
= lttng_get_probe_list_head();
2249 * For each probe event, if we find that a probe event matches
2250 * our enabler, create an associated lttng_event if not
2253 list_for_each_entry(probe_desc
, probe_list
, head
) {
2254 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2256 struct hlist_head
*head
;
2257 struct lttng_kernel_event_common
*event
;
2258 struct lttng_kernel_event_common_private
*event_priv
;
2260 desc
= probe_desc
->event_desc
[i
];
2261 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2265 * Check if already created.
2267 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2268 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2269 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2276 * We need to create an event for this event probe.
2278 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2280 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2281 probe_desc
->event_desc
[i
]->event_name
);
2288 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2292 ret
= lttng_syscalls_register_event(event_enabler
);
2297 * Create event if it is missing and present in the list of tracepoint probes.
2298 * Should be called with sessions mutex held.
2301 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2303 switch (event_enabler
->event_param
.instrumentation
) {
2304 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2305 lttng_create_tracepoint_event_if_missing(event_enabler
);
2308 case LTTNG_KERNEL_ABI_SYSCALL
:
2309 lttng_create_syscall_event_if_missing(event_enabler
);
2319 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2320 struct lttng_kernel_event_common
*event
)
2322 /* Link filter bytecodes if not linked yet. */
2323 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2324 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2328 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2329 struct lttng_kernel_event_common
*event
)
2331 switch (event_enabler
->enabler_type
) {
2332 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2334 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2336 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2337 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2338 struct lttng_kernel_event_notifier
*event_notifier
=
2339 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2341 /* Link capture bytecodes if not linked yet. */
2342 lttng_enabler_link_bytecode(event
->priv
->desc
,
2343 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2344 &event_notifier_enabler
->capture_bytecode_head
);
2345 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2354 * Create events associated with an event_enabler (if not already present),
2355 * and add backward reference from the event to the enabler.
2356 * Should be called with sessions mutex held.
2359 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2361 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2362 struct lttng_kernel_event_common_private
*event_priv
;
2364 lttng_syscall_table_set_wildcard_all(event_enabler
);
2366 /* First ensure that probe events are created for this enabler. */
2367 lttng_create_event_if_missing(event_enabler
);
2369 /* Link the created event with its associated enabler. */
2370 list_for_each_entry(event_priv
, event_list_head
, node
) {
2371 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2372 struct lttng_enabler_ref
*enabler_ref
;
2374 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2377 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2380 * If no backward ref, create it.
2381 * Add backward ref from event_notifier to enabler.
2383 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2387 enabler_ref
->ref
= event_enabler
;
2388 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2391 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2392 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2398 * Called at module load: connect the probe on all enablers matching
2400 * Called with sessions lock held.
2402 int lttng_fix_pending_events(void)
2404 struct lttng_kernel_session_private
*session_priv
;
2406 list_for_each_entry(session_priv
, &sessions
, list
)
2407 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2411 static bool lttng_event_notifier_group_has_active_event_notifiers(
2412 struct lttng_event_notifier_group
*event_notifier_group
)
2414 struct lttng_event_enabler_common
*event_enabler
;
2416 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2417 if (event_enabler
->enabled
)
2423 bool lttng_event_notifier_active(void)
2425 struct lttng_event_notifier_group
*event_notifier_group
;
2427 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2428 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2434 int lttng_fix_pending_event_notifiers(void)
2436 struct lttng_event_notifier_group
*event_notifier_group
;
2438 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2439 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2443 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2444 enum lttng_enabler_format_type format_type
,
2445 struct lttng_kernel_abi_event
*event_param
,
2446 struct lttng_kernel_channel_buffer
*chan
)
2448 struct lttng_event_recorder_enabler
*event_enabler
;
2450 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2453 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2454 event_enabler
->parent
.format_type
= format_type
;
2455 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2456 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2457 sizeof(event_enabler
->parent
.event_param
));
2458 event_enabler
->chan
= chan
;
2460 event_enabler
->parent
.enabled
= 0;
2461 return event_enabler
;
2464 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2465 struct lttng_event_recorder_enabler
*event_enabler
)
2467 mutex_lock(&sessions_mutex
);
2468 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2469 event_enabler
->parent
.published
= true;
2470 lttng_session_lazy_sync_event_enablers(session
);
2471 mutex_unlock(&sessions_mutex
);
2474 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2476 mutex_lock(&sessions_mutex
);
2477 event_enabler
->enabled
= 1;
2478 lttng_event_enabler_sync(event_enabler
);
2479 mutex_unlock(&sessions_mutex
);
2483 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2485 mutex_lock(&sessions_mutex
);
2486 event_enabler
->enabled
= 0;
2487 lttng_event_enabler_sync(event_enabler
);
2488 mutex_unlock(&sessions_mutex
);
2493 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2494 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2496 struct lttng_kernel_bytecode_node
*bytecode_node
;
2497 uint32_t bytecode_len
;
2500 ret
= get_user(bytecode_len
, &bytecode
->len
);
2503 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2507 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2508 sizeof(*bytecode
) + bytecode_len
);
2512 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2513 bytecode_node
->enabler
= enabler
;
2514 /* Enforce length based on allocated size */
2515 bytecode_node
->bc
.len
= bytecode_len
;
2516 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2521 lttng_kvfree(bytecode_node
);
2525 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2526 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2529 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2532 lttng_event_enabler_sync(event_enabler
);
2539 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2540 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2543 switch (event
->priv
->instrumentation
) {
2544 case LTTNG_KERNEL_ABI_UPROBE
:
2545 return lttng_uprobes_event_add_callsite(event
, callsite
);
2552 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2554 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2556 /* Destroy filter bytecode */
2557 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2558 &enabler
->filter_bytecode_head
, node
) {
2559 lttng_kvfree(filter_node
);
2563 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2565 lttng_enabler_destroy(event_enabler
);
2566 if (event_enabler
->published
)
2567 list_del(&event_enabler
->node
);
2569 switch (event_enabler
->enabler_type
) {
2570 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2572 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2573 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2575 kfree(event_recorder_enabler
);
2578 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2580 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2581 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2583 kfree(event_notifier_enabler
);
2591 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2592 enum lttng_enabler_format_type format_type
,
2593 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2594 struct lttng_event_notifier_group
*event_notifier_group
)
2596 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2598 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2599 if (!event_notifier_enabler
)
2602 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2603 event_notifier_enabler
->parent
.format_type
= format_type
;
2604 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2605 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2607 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2608 event_notifier_enabler
->num_captures
= 0;
2610 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2611 sizeof(event_notifier_enabler
->parent
.event_param
));
2613 event_notifier_enabler
->parent
.enabled
= 0;
2614 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2615 event_notifier_enabler
->group
= event_notifier_group
;
2616 return event_notifier_enabler
;
2619 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2620 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2622 mutex_lock(&sessions_mutex
);
2623 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2624 event_notifier_enabler
->parent
.published
= true;
2625 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2626 mutex_unlock(&sessions_mutex
);
2629 int lttng_event_notifier_enabler_enable(
2630 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2632 mutex_lock(&sessions_mutex
);
2633 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2634 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2635 mutex_unlock(&sessions_mutex
);
2639 int lttng_event_notifier_enabler_disable(
2640 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2642 mutex_lock(&sessions_mutex
);
2643 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2644 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2645 mutex_unlock(&sessions_mutex
);
2649 int lttng_event_notifier_enabler_attach_capture_bytecode(
2650 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2651 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2653 struct lttng_kernel_bytecode_node
*bytecode_node
;
2654 struct lttng_event_enabler_common
*enabler
=
2655 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2656 uint32_t bytecode_len
;
2659 ret
= get_user(bytecode_len
, &bytecode
->len
);
2663 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2668 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2669 sizeof(*bytecode
) + bytecode_len
);
2673 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2674 bytecode_node
->enabler
= enabler
;
2676 /* Enforce length based on allocated size */
2677 bytecode_node
->bc
.len
= bytecode_len
;
2678 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2680 event_notifier_enabler
->num_captures
++;
2682 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2686 lttng_kvfree(bytecode_node
);
2692 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2694 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2695 struct lttng_kernel_bytecode_runtime
*runtime
;
2696 struct lttng_enabler_ref
*enabler_ref
;
2698 /* Check if has enablers without bytecode enabled */
2699 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2700 if (enabler_ref
->ref
->enabled
2701 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2702 has_enablers_without_filter_bytecode
= 1;
2706 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2708 /* Enable filters */
2709 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2710 lttng_bytecode_sync_state(runtime
);
2713 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2717 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2719 switch (event
->type
) {
2720 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2722 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2724 struct lttng_kernel_event_notifier
*event_notifier
=
2725 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2726 struct lttng_kernel_bytecode_runtime
*runtime
;
2727 int nr_captures
= 0;
2729 /* Enable captures */
2730 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2731 lttng_bytecode_sync_state(runtime
);
2734 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2743 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2745 struct lttng_enabler_ref
*enabler_ref
;
2746 bool enabled
= false;
2748 switch (event
->priv
->instrumentation
) {
2749 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2751 case LTTNG_KERNEL_ABI_SYSCALL
:
2753 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2754 if (enabler_ref
->ref
->enabled
) {
2765 switch (event
->type
) {
2766 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2768 struct lttng_kernel_event_recorder
*event_recorder
=
2769 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2772 * Enabled state is based on union of enablers, with
2773 * intersection of session and channel transient enable
2776 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2778 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2787 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2789 switch (event
->priv
->instrumentation
) {
2790 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2792 case LTTNG_KERNEL_ABI_SYSCALL
:
2796 /* Not handled with lazy sync. */
2802 * Should be called with sessions mutex held.
2805 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2806 struct list_head
*event_list
)
2808 struct lttng_kernel_event_common_private
*event_priv
;
2809 struct lttng_event_enabler_common
*event_enabler
;
2811 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2812 lttng_event_enabler_ref_events(event_enabler
);
2815 * For each event, if at least one of its enablers is enabled,
2816 * and its channel and session transient states are enabled, we
2817 * enable the event, else we disable it.
2819 list_for_each_entry(event_priv
, event_list
, node
) {
2820 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2823 if (!lttng_event_is_lazy_sync(event
))
2826 enabled
= lttng_get_event_enabled_state(event
);
2827 WRITE_ONCE(event
->enabled
, enabled
);
2829 * Sync tracepoint registration with event enabled state.
2832 register_event(event
);
2834 _lttng_event_unregister(event
);
2837 lttng_event_sync_filter_state(event
);
2838 lttng_event_sync_capture_state(event
);
2843 * lttng_session_sync_event_enablers should be called just before starting a
2847 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2849 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2853 * Apply enablers to session events, adding events to session if need
2854 * be. It is required after each modification applied to an active
2855 * session, and right before session "start".
2856 * "lazy" sync means we only sync if required.
2857 * Should be called with sessions mutex held.
2860 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2862 /* We can skip if session is not active */
2863 if (!session
->active
)
2865 lttng_session_sync_event_enablers(session
);
2869 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2871 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2875 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2877 switch (event_enabler
->enabler_type
) {
2878 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2880 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2881 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2882 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2885 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2887 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2888 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2889 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2898 * Serialize at most one packet worth of metadata into a metadata
2900 * We grab the metadata cache mutex to get exclusive access to our metadata
2901 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2902 * allows us to do racy operations such as looking for remaining space left in
2903 * packet and write, since mutual exclusion protects us from concurrent writes.
2904 * Mutual exclusion on the metadata cache allow us to read the cache content
2905 * without racing against reallocation of the cache by updates.
2906 * Returns the number of bytes written in the channel, 0 if no data
2907 * was written and a negative value on error.
2909 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2910 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2912 struct lttng_kernel_ring_buffer_ctx ctx
;
2914 size_t len
, reserve_len
;
2917 * Ensure we support mutiple get_next / put sequences followed by
2918 * put_next. The metadata cache lock protects reading the metadata
2919 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2920 * "flush" operations on the buffer invoked by different processes.
2921 * Moreover, since the metadata cache memory can be reallocated, we
2922 * need to have exclusive access against updates even though we only
2925 mutex_lock(&stream
->metadata_cache
->lock
);
2926 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2927 if (stream
->metadata_in
!= stream
->metadata_out
)
2930 /* Metadata regenerated, change the version. */
2931 if (stream
->metadata_cache
->version
!= stream
->version
)
2932 stream
->version
= stream
->metadata_cache
->version
;
2934 len
= stream
->metadata_cache
->metadata_written
-
2935 stream
->metadata_in
;
2938 reserve_len
= min_t(size_t,
2939 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2941 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2942 sizeof(char), NULL
);
2944 * If reservation failed, return an error to the caller.
2946 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2948 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2949 stream
->coherent
= false;
2952 stream
->transport
->ops
.event_write(&ctx
,
2953 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2955 stream
->transport
->ops
.event_commit(&ctx
);
2956 stream
->metadata_in
+= reserve_len
;
2957 if (reserve_len
< len
)
2958 stream
->coherent
= false;
2960 stream
->coherent
= true;
2965 *coherent
= stream
->coherent
;
2966 mutex_unlock(&stream
->metadata_cache
->lock
);
2971 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2973 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2974 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2978 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2980 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2981 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2982 struct lttng_metadata_stream
*stream
;
2984 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2985 wake_up_interruptible(&stream
->read_wait
);
2986 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2991 * Write the metadata to the metadata cache.
2992 * Must be called with sessions_mutex held.
2993 * The metadata cache lock protects us from concurrent read access from
2994 * thread outputting metadata content to ring buffer.
2995 * The content of the printf is printed as a single atomic metadata
2998 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2999 const char *fmt
, ...)
3005 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3008 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3014 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3015 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3016 session
->priv
->metadata_cache
->cache_alloc
) {
3017 char *tmp_cache_realloc
;
3018 unsigned int tmp_cache_alloc_size
;
3020 tmp_cache_alloc_size
= max_t(unsigned int,
3021 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3022 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3023 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3024 if (!tmp_cache_realloc
)
3026 if (session
->priv
->metadata_cache
->data
) {
3027 memcpy(tmp_cache_realloc
,
3028 session
->priv
->metadata_cache
->data
,
3029 session
->priv
->metadata_cache
->cache_alloc
);
3030 vfree(session
->priv
->metadata_cache
->data
);
3033 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3034 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3036 memcpy(session
->priv
->metadata_cache
->data
+
3037 session
->priv
->metadata_cache
->metadata_written
,
3039 session
->priv
->metadata_cache
->metadata_written
+= len
;
3050 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3054 for (i
= 0; i
< nesting
; i
++) {
3057 ret
= lttng_metadata_printf(session
, " ");
3066 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3067 const struct lttng_kernel_event_field
*field
,
3070 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3074 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3075 const struct lttng_kernel_type_integer
*type
,
3076 enum lttng_kernel_string_encoding parent_encoding
,
3081 ret
= print_tabs(session
, nesting
);
3084 ret
= lttng_metadata_printf(session
,
3085 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3089 (parent_encoding
== lttng_kernel_string_encoding_none
)
3091 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3095 #if __BYTE_ORDER == __BIG_ENDIAN
3096 type
->reverse_byte_order
? " byte_order = le;" : ""
3098 type
->reverse_byte_order
? " byte_order = be;" : ""
3105 * Must be called with sessions_mutex held.
3108 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3109 const struct lttng_kernel_type_struct
*type
,
3112 const char *prev_field_name
= NULL
;
3114 uint32_t i
, nr_fields
;
3115 unsigned int alignment
;
3117 ret
= print_tabs(session
, nesting
);
3120 ret
= lttng_metadata_printf(session
,
3124 nr_fields
= type
->nr_fields
;
3125 for (i
= 0; i
< nr_fields
; i
++) {
3126 const struct lttng_kernel_event_field
*iter_field
;
3128 iter_field
= type
->fields
[i
];
3129 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3133 ret
= print_tabs(session
, nesting
);
3136 alignment
= type
->alignment
;
3138 ret
= lttng_metadata_printf(session
,
3142 ret
= lttng_metadata_printf(session
,
3149 * Must be called with sessions_mutex held.
3152 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3153 const struct lttng_kernel_event_field
*field
,
3158 ret
= _lttng_struct_type_statedump(session
,
3159 lttng_kernel_get_type_struct(field
->type
), nesting
);
3162 return lttng_field_name_statedump(session
, field
, nesting
);
3166 * Must be called with sessions_mutex held.
3169 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3170 const struct lttng_kernel_type_variant
*type
,
3172 const char *prev_field_name
)
3174 const char *tag_name
;
3176 uint32_t i
, nr_choices
;
3178 tag_name
= type
->tag_name
;
3180 tag_name
= prev_field_name
;
3184 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3186 if (type
->alignment
!= 0)
3188 ret
= print_tabs(session
, nesting
);
3191 ret
= lttng_metadata_printf(session
,
3192 "variant <_%s> {\n",
3196 nr_choices
= type
->nr_choices
;
3197 for (i
= 0; i
< nr_choices
; i
++) {
3198 const struct lttng_kernel_event_field
*iter_field
;
3200 iter_field
= type
->choices
[i
];
3201 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3205 ret
= print_tabs(session
, nesting
);
3208 ret
= lttng_metadata_printf(session
,
3214 * Must be called with sessions_mutex held.
3217 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3218 const struct lttng_kernel_event_field
*field
,
3220 const char *prev_field_name
)
3224 ret
= _lttng_variant_type_statedump(session
,
3225 lttng_kernel_get_type_variant(field
->type
), nesting
,
3229 return lttng_field_name_statedump(session
, field
, nesting
);
3233 * Must be called with sessions_mutex held.
3236 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3237 const struct lttng_kernel_event_field
*field
,
3241 const struct lttng_kernel_type_array
*array_type
;
3242 const struct lttng_kernel_type_common
*elem_type
;
3244 array_type
= lttng_kernel_get_type_array(field
->type
);
3245 WARN_ON_ONCE(!array_type
);
3247 if (array_type
->alignment
) {
3248 ret
= print_tabs(session
, nesting
);
3251 ret
= lttng_metadata_printf(session
,
3252 "struct { } align(%u) _%s_padding;\n",
3253 array_type
->alignment
* CHAR_BIT
,
3259 * Nested compound types: Only array of structures and variants are
3260 * currently supported.
3262 elem_type
= array_type
->elem_type
;
3263 switch (elem_type
->type
) {
3264 case lttng_kernel_type_integer
:
3265 case lttng_kernel_type_struct
:
3266 case lttng_kernel_type_variant
:
3267 ret
= _lttng_type_statedump(session
, elem_type
,
3268 array_type
->encoding
, nesting
);
3276 ret
= lttng_metadata_printf(session
,
3279 array_type
->length
);
3284 * Must be called with sessions_mutex held.
3287 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3288 const struct lttng_kernel_event_field
*field
,
3290 const char *prev_field_name
)
3293 const char *length_name
;
3294 const struct lttng_kernel_type_sequence
*sequence_type
;
3295 const struct lttng_kernel_type_common
*elem_type
;
3297 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3298 WARN_ON_ONCE(!sequence_type
);
3300 length_name
= sequence_type
->length_name
;
3302 length_name
= prev_field_name
;
3306 if (sequence_type
->alignment
) {
3307 ret
= print_tabs(session
, nesting
);
3310 ret
= lttng_metadata_printf(session
,
3311 "struct { } align(%u) _%s_padding;\n",
3312 sequence_type
->alignment
* CHAR_BIT
,
3319 * Nested compound types: Only array of structures and variants are
3320 * currently supported.
3322 elem_type
= sequence_type
->elem_type
;
3323 switch (elem_type
->type
) {
3324 case lttng_kernel_type_integer
:
3325 case lttng_kernel_type_struct
:
3326 case lttng_kernel_type_variant
:
3327 ret
= _lttng_type_statedump(session
, elem_type
,
3328 sequence_type
->encoding
, nesting
);
3336 ret
= lttng_metadata_printf(session
,
3344 * Must be called with sessions_mutex held.
3347 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3348 const struct lttng_kernel_type_enum
*type
,
3351 const struct lttng_kernel_enum_desc
*enum_desc
;
3352 const struct lttng_kernel_type_common
*container_type
;
3354 unsigned int i
, nr_entries
;
3356 container_type
= type
->container_type
;
3357 if (container_type
->type
!= lttng_kernel_type_integer
) {
3361 enum_desc
= type
->desc
;
3362 nr_entries
= enum_desc
->nr_entries
;
3364 ret
= print_tabs(session
, nesting
);
3367 ret
= lttng_metadata_printf(session
, "enum : ");
3370 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3371 lttng_kernel_string_encoding_none
, 0);
3374 ret
= lttng_metadata_printf(session
, " {\n");
3377 /* Dump all entries */
3378 for (i
= 0; i
< nr_entries
; i
++) {
3379 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3382 ret
= print_tabs(session
, nesting
+ 1);
3385 ret
= lttng_metadata_printf(session
,
3389 len
= strlen(entry
->string
);
3390 /* Escape the character '"' */
3391 for (j
= 0; j
< len
; j
++) {
3392 char c
= entry
->string
[j
];
3396 ret
= lttng_metadata_printf(session
,
3400 ret
= lttng_metadata_printf(session
,
3404 ret
= lttng_metadata_printf(session
,
3411 ret
= lttng_metadata_printf(session
, "\"");
3415 if (entry
->options
.is_auto
) {
3416 ret
= lttng_metadata_printf(session
, ",\n");
3420 ret
= lttng_metadata_printf(session
,
3424 if (entry
->start
.signedness
)
3425 ret
= lttng_metadata_printf(session
,
3426 "%lld", (long long) entry
->start
.value
);
3428 ret
= lttng_metadata_printf(session
,
3429 "%llu", entry
->start
.value
);
3432 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3434 == entry
->end
.value
) {
3435 ret
= lttng_metadata_printf(session
,
3438 if (entry
->end
.signedness
) {
3439 ret
= lttng_metadata_printf(session
,
3441 (long long) entry
->end
.value
);
3443 ret
= lttng_metadata_printf(session
,
3452 ret
= print_tabs(session
, nesting
);
3455 ret
= lttng_metadata_printf(session
, "}");
3461 * Must be called with sessions_mutex held.
3464 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3465 const struct lttng_kernel_event_field
*field
,
3469 const struct lttng_kernel_type_enum
*enum_type
;
3471 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3472 WARN_ON_ONCE(!enum_type
);
3473 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3476 return lttng_field_name_statedump(session
, field
, nesting
);
3480 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3481 const struct lttng_kernel_event_field
*field
,
3486 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3487 lttng_kernel_string_encoding_none
, nesting
);
3490 return lttng_field_name_statedump(session
, field
, nesting
);
3494 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3495 const struct lttng_kernel_type_string
*type
,
3500 /* Default encoding is UTF8 */
3501 ret
= print_tabs(session
, nesting
);
3504 ret
= lttng_metadata_printf(session
,
3506 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3507 " { encoding = ASCII; }" : "");
3512 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3513 const struct lttng_kernel_event_field
*field
,
3516 const struct lttng_kernel_type_string
*string_type
;
3519 string_type
= lttng_kernel_get_type_string(field
->type
);
3520 WARN_ON_ONCE(!string_type
);
3521 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3524 return lttng_field_name_statedump(session
, field
, nesting
);
3528 * Must be called with sessions_mutex held.
3531 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3532 const struct lttng_kernel_type_common
*type
,
3533 enum lttng_kernel_string_encoding parent_encoding
,
3538 switch (type
->type
) {
3539 case lttng_kernel_type_integer
:
3540 ret
= _lttng_integer_type_statedump(session
,
3541 lttng_kernel_get_type_integer(type
),
3542 parent_encoding
, nesting
);
3544 case lttng_kernel_type_enum
:
3545 ret
= _lttng_enum_type_statedump(session
,
3546 lttng_kernel_get_type_enum(type
),
3549 case lttng_kernel_type_string
:
3550 ret
= _lttng_string_type_statedump(session
,
3551 lttng_kernel_get_type_string(type
),
3554 case lttng_kernel_type_struct
:
3555 ret
= _lttng_struct_type_statedump(session
,
3556 lttng_kernel_get_type_struct(type
),
3559 case lttng_kernel_type_variant
:
3560 ret
= _lttng_variant_type_statedump(session
,
3561 lttng_kernel_get_type_variant(type
),
3565 /* Nested arrays and sequences are not supported yet. */
3566 case lttng_kernel_type_array
:
3567 case lttng_kernel_type_sequence
:
3576 * Must be called with sessions_mutex held.
3579 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3580 const struct lttng_kernel_event_field
*field
,
3582 const char **prev_field_name_p
)
3584 const char *prev_field_name
= NULL
;
3587 if (prev_field_name_p
)
3588 prev_field_name
= *prev_field_name_p
;
3589 switch (field
->type
->type
) {
3590 case lttng_kernel_type_integer
:
3591 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3593 case lttng_kernel_type_enum
:
3594 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3596 case lttng_kernel_type_string
:
3597 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3599 case lttng_kernel_type_struct
:
3600 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3602 case lttng_kernel_type_array
:
3603 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3605 case lttng_kernel_type_sequence
:
3606 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3608 case lttng_kernel_type_variant
:
3609 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3616 if (prev_field_name_p
)
3617 *prev_field_name_p
= field
->name
;
3622 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3623 struct lttng_kernel_ctx
*ctx
)
3625 const char *prev_field_name
= NULL
;
3631 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3632 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3634 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3642 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3643 struct lttng_kernel_event_recorder
*event_recorder
)
3645 const char *prev_field_name
= NULL
;
3646 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3650 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3651 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3653 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3661 * Must be called with sessions_mutex held.
3662 * The entire event metadata is printed as a single atomic metadata
3666 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3667 struct lttng_kernel_channel_buffer
*chan
,
3668 struct lttng_kernel_event_recorder
*event_recorder
)
3672 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3674 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3677 lttng_metadata_begin(session
);
3679 ret
= lttng_metadata_printf(session
,
3683 " stream_id = %u;\n",
3684 event_recorder
->priv
->parent
.desc
->event_name
,
3685 event_recorder
->priv
->id
,
3686 event_recorder
->chan
->priv
->id
);
3690 ret
= lttng_metadata_printf(session
,
3691 " fields := struct {\n"
3696 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3701 * LTTng space reservation can only reserve multiples of the
3704 ret
= lttng_metadata_printf(session
,
3710 event_recorder
->priv
->metadata_dumped
= 1;
3712 lttng_metadata_end(session
);
3718 * Must be called with sessions_mutex held.
3719 * The entire channel metadata is printed as a single atomic metadata
3723 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3724 struct lttng_kernel_channel_buffer
*chan
)
3728 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3731 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3734 lttng_metadata_begin(session
);
3736 WARN_ON_ONCE(!chan
->priv
->header_type
);
3737 ret
= lttng_metadata_printf(session
,
3740 " event.header := %s;\n"
3741 " packet.context := struct packet_context;\n",
3743 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3744 "struct event_header_large");
3748 if (chan
->priv
->ctx
) {
3749 ret
= lttng_metadata_printf(session
,
3750 " event.context := struct {\n");
3754 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3757 if (chan
->priv
->ctx
) {
3758 ret
= lttng_metadata_printf(session
,
3764 ret
= lttng_metadata_printf(session
,
3767 chan
->priv
->metadata_dumped
= 1;
3769 lttng_metadata_end(session
);
3774 * Must be called with sessions_mutex held.
3777 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3779 return lttng_metadata_printf(session
,
3780 "struct packet_context {\n"
3781 " uint64_clock_monotonic_t timestamp_begin;\n"
3782 " uint64_clock_monotonic_t timestamp_end;\n"
3783 " uint64_t content_size;\n"
3784 " uint64_t packet_size;\n"
3785 " uint64_t packet_seq_num;\n"
3786 " unsigned long events_discarded;\n"
3787 " uint32_t cpu_id;\n"
3794 * id: range: 0 - 30.
3795 * id 31 is reserved to indicate an extended header.
3798 * id: range: 0 - 65534.
3799 * id 65535 is reserved to indicate an extended header.
3801 * Must be called with sessions_mutex held.
3804 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3806 return lttng_metadata_printf(session
,
3807 "struct event_header_compact {\n"
3808 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3811 " uint27_clock_monotonic_t timestamp;\n"
3815 " uint64_clock_monotonic_t timestamp;\n"
3820 "struct event_header_large {\n"
3821 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3824 " uint32_clock_monotonic_t timestamp;\n"
3828 " uint64_clock_monotonic_t timestamp;\n"
3832 lttng_alignof(uint32_t) * CHAR_BIT
,
3833 lttng_alignof(uint16_t) * CHAR_BIT
3838 * Approximation of NTP time of day to clock monotonic correlation,
3839 * taken at start of trace.
3840 * Yes, this is only an approximation. Yes, we can (and will) do better
3841 * in future versions.
3842 * This function may return a negative offset. It may happen if the
3843 * system sets the REALTIME clock to 0 after boot.
3845 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3849 int64_t measure_clock_offset(void)
3851 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3852 uint64_t tcf
= trace_clock_freq();
3854 unsigned long flags
;
3855 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3856 struct timespec64 rts
= { 0, 0 };
3858 struct timespec rts
= { 0, 0 };
3861 /* Disable interrupts to increase correlation precision. */
3862 local_irq_save(flags
);
3863 monotonic
[0] = trace_clock_read64();
3864 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3865 ktime_get_real_ts64(&rts
);
3867 getnstimeofday(&rts
);
3869 monotonic
[1] = trace_clock_read64();
3870 local_irq_restore(flags
);
3872 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3873 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3874 if (tcf
== NSEC_PER_SEC
) {
3875 realtime
+= rts
.tv_nsec
;
3877 uint64_t n
= rts
.tv_nsec
* tcf
;
3879 do_div(n
, NSEC_PER_SEC
);
3882 offset
= (int64_t) realtime
- monotonic_avg
;
3887 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3895 while (cur
!= '\0') {
3898 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3902 ret
= lttng_metadata_printf(session
, "%c", '\\');
3905 /* We still print the current char */
3908 ret
= lttng_metadata_printf(session
, "%c", cur
);
3922 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3923 const char *field_value
)
3927 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3931 ret
= print_escaped_ctf_string(session
, field_value
);
3935 ret
= lttng_metadata_printf(session
, "\";\n");
3942 * Output metadata into this session's metadata buffers.
3943 * Must be called with sessions_mutex held.
3946 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3948 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3949 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3950 const char *product_uuid
;
3951 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3952 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3955 if (!LTTNG_READ_ONCE(session
->active
))
3958 lttng_metadata_begin(session
);
3960 if (session
->priv
->metadata_dumped
)
3963 snprintf(uuid_s
, sizeof(uuid_s
),
3964 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3965 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3966 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3967 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3968 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3970 ret
= lttng_metadata_printf(session
,
3971 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3972 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3973 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3974 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3975 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3976 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3977 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3983 " byte_order = %s;\n"
3984 " packet.header := struct {\n"
3985 " uint32_t magic;\n"
3986 " uint8_t uuid[16];\n"
3987 " uint32_t stream_id;\n"
3988 " uint64_t stream_instance_id;\n"
3991 lttng_alignof(uint8_t) * CHAR_BIT
,
3992 lttng_alignof(uint16_t) * CHAR_BIT
,
3993 lttng_alignof(uint32_t) * CHAR_BIT
,
3994 lttng_alignof(uint64_t) * CHAR_BIT
,
3995 sizeof(unsigned long) * CHAR_BIT
,
3996 lttng_alignof(unsigned long) * CHAR_BIT
,
4000 #if __BYTE_ORDER == __BIG_ENDIAN
4009 ret
= lttng_metadata_printf(session
,
4011 " hostname = \"%s\";\n"
4012 " domain = \"kernel\";\n"
4013 " sysname = \"%s\";\n"
4014 " kernel_release = \"%s\";\n"
4015 " kernel_version = \"%s\";\n"
4016 " tracer_name = \"lttng-modules\";\n"
4017 " tracer_major = %d;\n"
4018 " tracer_minor = %d;\n"
4019 " tracer_patchlevel = %d;\n"
4020 " trace_buffering_scheme = \"global\";\n",
4021 current
->nsproxy
->uts_ns
->name
.nodename
,
4025 LTTNG_MODULES_MAJOR_VERSION
,
4026 LTTNG_MODULES_MINOR_VERSION
,
4027 LTTNG_MODULES_PATCHLEVEL_VERSION
4032 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4035 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4036 session
->priv
->creation_time
);
4040 /* Add the product UUID to the 'env' section */
4041 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4043 ret
= lttng_metadata_printf(session
,
4044 " product_uuid = \"%s\";\n",
4051 /* Close the 'env' section */
4052 ret
= lttng_metadata_printf(session
, "};\n\n");
4056 ret
= lttng_metadata_printf(session
,
4058 " name = \"%s\";\n",
4064 if (!trace_clock_uuid(clock_uuid_s
)) {
4065 ret
= lttng_metadata_printf(session
,
4066 " uuid = \"%s\";\n",
4073 ret
= lttng_metadata_printf(session
,
4074 " description = \"%s\";\n"
4075 " freq = %llu; /* Frequency, in Hz */\n"
4076 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4079 trace_clock_description(),
4080 (unsigned long long) trace_clock_freq(),
4081 (long long) measure_clock_offset()
4086 ret
= lttng_metadata_printf(session
,
4087 "typealias integer {\n"
4088 " size = 27; align = 1; signed = false;\n"
4089 " map = clock.%s.value;\n"
4090 "} := uint27_clock_monotonic_t;\n"
4092 "typealias integer {\n"
4093 " size = 32; align = %u; signed = false;\n"
4094 " map = clock.%s.value;\n"
4095 "} := uint32_clock_monotonic_t;\n"
4097 "typealias integer {\n"
4098 " size = 64; align = %u; signed = false;\n"
4099 " map = clock.%s.value;\n"
4100 "} := uint64_clock_monotonic_t;\n\n",
4102 lttng_alignof(uint32_t) * CHAR_BIT
,
4104 lttng_alignof(uint64_t) * CHAR_BIT
,
4110 ret
= _lttng_stream_packet_context_declare(session
);
4114 ret
= _lttng_event_header_declare(session
);
4119 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4120 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4125 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4126 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4127 event_recorder_priv
->pub
);
4131 session
->priv
->metadata_dumped
= 1;
4133 lttng_metadata_end(session
);
4138 * lttng_transport_register - LTT transport registration
4139 * @transport: transport structure
4141 * Registers a transport which can be used as output to extract the data out of
4142 * LTTng. The module calling this registration function must ensure that no
4143 * trap-inducing code will be executed by the transport functions. E.g.
4144 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4145 * is made visible to the transport function. This registration acts as a
4146 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4147 * after its registration must it synchronize the TLBs.
4149 void lttng_transport_register(struct lttng_transport
*transport
)
4152 * Make sure no page fault can be triggered by the module about to be
4153 * registered. We deal with this here so we don't have to call
4154 * vmalloc_sync_mappings() in each module's init.
4156 wrapper_vmalloc_sync_mappings();
4158 mutex_lock(&sessions_mutex
);
4159 list_add_tail(&transport
->node
, <tng_transport_list
);
4160 mutex_unlock(&sessions_mutex
);
4162 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4165 * lttng_transport_unregister - LTT transport unregistration
4166 * @transport: transport structure
4168 void lttng_transport_unregister(struct lttng_transport
*transport
)
4170 mutex_lock(&sessions_mutex
);
4171 list_del(&transport
->node
);
4172 mutex_unlock(&sessions_mutex
);
4174 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4176 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4179 * Make sure no page fault can be triggered by the module about to be
4180 * registered. We deal with this here so we don't have to call
4181 * vmalloc_sync_mappings() in each module's init.
4183 wrapper_vmalloc_sync_mappings();
4185 mutex_lock(&sessions_mutex
);
4186 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4187 mutex_unlock(&sessions_mutex
);
4189 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4191 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4193 mutex_lock(&sessions_mutex
);
4194 list_del(&transport
->node
);
4195 mutex_unlock(&sessions_mutex
);
4197 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4199 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4201 enum cpuhp_state lttng_hp_prepare
;
4202 enum cpuhp_state lttng_hp_online
;
4204 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4206 struct lttng_cpuhp_node
*lttng_node
;
4208 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4209 switch (lttng_node
->component
) {
4210 case LTTNG_RING_BUFFER_FRONTEND
:
4212 case LTTNG_RING_BUFFER_BACKEND
:
4213 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4214 case LTTNG_RING_BUFFER_ITER
:
4216 case LTTNG_CONTEXT_PERF_COUNTERS
:
4223 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4225 struct lttng_cpuhp_node
*lttng_node
;
4227 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4228 switch (lttng_node
->component
) {
4229 case LTTNG_RING_BUFFER_FRONTEND
:
4230 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4231 case LTTNG_RING_BUFFER_BACKEND
:
4233 case LTTNG_RING_BUFFER_ITER
:
4235 case LTTNG_CONTEXT_PERF_COUNTERS
:
4236 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4242 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4244 struct lttng_cpuhp_node
*lttng_node
;
4246 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4247 switch (lttng_node
->component
) {
4248 case LTTNG_RING_BUFFER_FRONTEND
:
4249 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4250 case LTTNG_RING_BUFFER_BACKEND
:
4252 case LTTNG_RING_BUFFER_ITER
:
4253 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4254 case LTTNG_CONTEXT_PERF_COUNTERS
:
4255 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4261 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4263 struct lttng_cpuhp_node
*lttng_node
;
4265 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4266 switch (lttng_node
->component
) {
4267 case LTTNG_RING_BUFFER_FRONTEND
:
4268 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4269 case LTTNG_RING_BUFFER_BACKEND
:
4271 case LTTNG_RING_BUFFER_ITER
:
4273 case LTTNG_CONTEXT_PERF_COUNTERS
:
4280 static int __init
lttng_init_cpu_hotplug(void)
4284 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4285 lttng_hotplug_prepare
,
4286 lttng_hotplug_dead
);
4290 lttng_hp_prepare
= ret
;
4291 lttng_rb_set_hp_prepare(ret
);
4293 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4294 lttng_hotplug_online
,
4295 lttng_hotplug_offline
);
4297 cpuhp_remove_multi_state(lttng_hp_prepare
);
4298 lttng_hp_prepare
= 0;
4301 lttng_hp_online
= ret
;
4302 lttng_rb_set_hp_online(ret
);
4307 static void __exit
lttng_exit_cpu_hotplug(void)
4309 lttng_rb_set_hp_online(0);
4310 cpuhp_remove_multi_state(lttng_hp_online
);
4311 lttng_rb_set_hp_prepare(0);
4312 cpuhp_remove_multi_state(lttng_hp_prepare
);
4315 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4316 static int lttng_init_cpu_hotplug(void)
4320 static void lttng_exit_cpu_hotplug(void)
4323 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4325 static int __init
lttng_events_init(void)
4329 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4332 ret
= wrapper_get_pfnblock_flags_mask_init();
4335 ret
= wrapper_get_pageblock_flags_mask_init();
4338 ret
= lttng_probes_init();
4341 ret
= lttng_context_init();
4344 ret
= lttng_tracepoint_init();
4347 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4348 if (!event_recorder_cache
) {
4350 goto error_kmem_event_recorder
;
4352 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4353 if (!event_recorder_private_cache
) {
4355 goto error_kmem_event_recorder_private
;
4357 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4358 if (!event_notifier_cache
) {
4360 goto error_kmem_event_notifier
;
4362 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4363 if (!event_notifier_private_cache
) {
4365 goto error_kmem_event_notifier_private
;
4367 ret
= lttng_abi_init();
4370 ret
= lttng_logger_init();
4373 ret
= lttng_init_cpu_hotplug();
4376 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4377 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4378 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4379 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4380 LTTNG_MODULES_EXTRAVERSION
,
4382 #ifdef LTTNG_EXTRA_VERSION_GIT
4383 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4387 #ifdef LTTNG_EXTRA_VERSION_NAME
4388 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4392 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4393 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4394 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4398 lttng_logger_exit();
4402 kmem_cache_destroy(event_notifier_private_cache
);
4403 error_kmem_event_notifier_private
:
4404 kmem_cache_destroy(event_notifier_cache
);
4405 error_kmem_event_notifier
:
4406 kmem_cache_destroy(event_recorder_private_cache
);
4407 error_kmem_event_recorder_private
:
4408 kmem_cache_destroy(event_recorder_cache
);
4409 error_kmem_event_recorder
:
4410 lttng_tracepoint_exit();
4412 lttng_context_exit();
4413 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4414 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4415 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4416 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4417 LTTNG_MODULES_EXTRAVERSION
,
4419 #ifdef LTTNG_EXTRA_VERSION_GIT
4420 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4424 #ifdef LTTNG_EXTRA_VERSION_NAME
4425 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4432 module_init(lttng_events_init
);
4434 static void __exit
lttng_events_exit(void)
4436 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4438 lttng_exit_cpu_hotplug();
4439 lttng_logger_exit();
4441 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4442 lttng_session_destroy(session_priv
->pub
);
4443 kmem_cache_destroy(event_recorder_cache
);
4444 kmem_cache_destroy(event_recorder_private_cache
);
4445 kmem_cache_destroy(event_notifier_cache
);
4446 kmem_cache_destroy(event_notifier_private_cache
);
4447 lttng_tracepoint_exit();
4448 lttng_context_exit();
4449 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4450 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4451 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4452 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4453 LTTNG_MODULES_EXTRAVERSION
,
4455 #ifdef LTTNG_EXTRA_VERSION_GIT
4456 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4460 #ifdef LTTNG_EXTRA_VERSION_NAME
4461 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4467 module_exit(lttng_events_exit
);
4469 #include <generated/patches.h>
4470 #ifdef LTTNG_EXTRA_VERSION_GIT
4471 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4473 #ifdef LTTNG_EXTRA_VERSION_NAME
4474 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4476 MODULE_LICENSE("GPL and additional rights");
4477 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4478 MODULE_DESCRIPTION("LTTng tracer");
4479 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4480 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4481 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4482 LTTNG_MODULES_EXTRAVERSION
);