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 list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1030 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
1031 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1032 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1033 struct lttng_kernel_event_common_private
*event_priv
;
1034 struct lttng_kernel_event_common
*event
;
1035 struct lttng_kernel_event_recorder
*event_recorder
;
1036 const char *event_name
;
1037 struct hlist_head
*head
;
1040 if (chan
->priv
->free_event_id
== -1U) {
1046 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1047 event_name
= event_desc
->event_name
;
1050 case LTTNG_KERNEL_ABI_KPROBE
:
1052 case LTTNG_KERNEL_ABI_UPROBE
:
1054 case LTTNG_KERNEL_ABI_KRETPROBE
:
1056 case LTTNG_KERNEL_ABI_SYSCALL
:
1057 event_name
= event_param
->name
;
1060 case LTTNG_KERNEL_ABI_FUNCTION
:
1062 case LTTNG_KERNEL_ABI_NOOP
:
1070 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1071 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1072 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1078 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1083 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1086 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1087 /* Event will be enabled by enabler sync. */
1089 event
->priv
->registered
= 0;
1090 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1091 if (!event
->priv
->desc
) {
1093 goto register_error
;
1095 /* Populate lttng_event structure before event registration. */
1099 case LTTNG_KERNEL_ABI_KPROBE
:
1101 * Needs to be explicitly enabled after creation, since
1102 * we may want to apply filters.
1105 event
->priv
->registered
= 1;
1107 * Populate lttng_event structure before event
1111 ret
= lttng_kprobes_register_event(event_name
,
1112 event_param
->u
.kprobe
.symbol_name
,
1113 event_param
->u
.kprobe
.offset
,
1114 event_param
->u
.kprobe
.addr
,
1118 goto register_error
;
1120 ret
= try_module_get(event
->priv
->desc
->owner
);
1124 case LTTNG_KERNEL_ABI_KRETPROBE
:
1126 struct lttng_kernel_event_common
*event_return
;
1127 struct lttng_kernel_event_recorder
*event_recorder_return
;
1129 /* kretprobe defines 2 events */
1131 * Needs to be explicitly enabled after creation, since
1132 * we may want to apply filters.
1135 event
->priv
->registered
= 1;
1137 event_return
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1142 event_recorder_return
= container_of(event_return
, struct lttng_kernel_event_recorder
, parent
);
1144 event_return
->enabled
= 0;
1145 event_return
->priv
->registered
= 1;
1148 * Populate lttng_event structure before kretprobe registration.
1151 ret
= lttng_kretprobes_register(event_name
,
1152 event_param
->u
.kretprobe
.symbol_name
,
1153 event_param
->u
.kretprobe
.offset
,
1154 event_param
->u
.kretprobe
.addr
,
1155 event
, event_return
);
1157 lttng_kernel_event_free(event_return
);
1159 goto register_error
;
1161 /* Take 2 refs on the module: one per event. */
1162 ret
= try_module_get(event
->priv
->desc
->owner
);
1164 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1166 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder_return
);
1167 WARN_ON_ONCE(ret
> 0);
1169 lttng_kernel_event_free(event_return
);
1170 module_put(event_return
->priv
->desc
->owner
);
1171 module_put(event
->priv
->desc
->owner
);
1172 goto statedump_error
;
1174 list_add(&event_return
->priv
->node
, event_list_head
);
1178 case LTTNG_KERNEL_ABI_SYSCALL
:
1180 * Needs to be explicitly enabled after creation, since
1181 * we may want to apply filters.
1184 event
->priv
->registered
= 0;
1185 event
->priv
->desc
= event_desc
;
1186 switch (event_param
->u
.syscall
.entryexit
) {
1187 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1189 goto register_error
;
1190 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1191 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1193 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1194 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1197 switch (event_param
->u
.syscall
.abi
) {
1198 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1200 goto register_error
;
1201 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1202 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1204 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1205 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1208 if (!event
->priv
->desc
) {
1210 goto register_error
;
1214 case LTTNG_KERNEL_ABI_UPROBE
:
1216 * Needs to be explicitly enabled after creation, since
1217 * we may want to apply filters.
1220 event
->priv
->registered
= 1;
1223 * Populate lttng_event structure before event
1228 ret
= lttng_uprobes_register_event(event_param
->name
,
1229 event_param
->u
.uprobe
.fd
,
1232 goto register_error
;
1233 ret
= try_module_get(event
->priv
->desc
->owner
);
1237 case LTTNG_KERNEL_ABI_FUNCTION
:
1239 case LTTNG_KERNEL_ABI_NOOP
:
1244 goto register_error
;
1246 ret
= _lttng_event_metadata_statedump(chan
->parent
.session
, chan
, event_recorder
);
1247 WARN_ON_ONCE(ret
> 0);
1249 goto statedump_error
;
1251 hlist_add_head(&event
->priv
->hlist_node
, head
);
1252 list_add(&event
->priv
->node
, event_list_head
);
1253 return event_recorder
;
1256 /* If a statedump error occurs, events will not be readable. */
1258 lttng_kernel_event_free(event
);
1263 return ERR_PTR(ret
);
1267 struct lttng_kernel_event_notifier
*_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler
*event_enabler
,
1268 const struct lttng_kernel_event_desc
*event_desc
)
1270 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_enabler
->parent
);
1271 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(&event_enabler
->parent
);
1272 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->parent
.event_param
;
1273 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1274 struct lttng_kernel_event_common_private
*event_priv
;
1275 struct lttng_kernel_event_common
*event
;
1276 struct lttng_kernel_event_notifier
*event_notifier
;
1277 const char *event_name
;
1278 struct hlist_head
*head
;
1282 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1283 event_name
= event_desc
->event_name
;
1286 case LTTNG_KERNEL_ABI_KPROBE
:
1288 case LTTNG_KERNEL_ABI_UPROBE
:
1290 case LTTNG_KERNEL_ABI_SYSCALL
:
1291 event_name
= event_param
->name
;
1294 case LTTNG_KERNEL_ABI_KRETPROBE
:
1296 case LTTNG_KERNEL_ABI_FUNCTION
:
1298 case LTTNG_KERNEL_ABI_NOOP
:
1306 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1307 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1308 if (lttng_event_enabler_event_name_match_event(&event_enabler
->parent
, event_name
, event_priv
->pub
)) {
1314 event
= lttng_kernel_event_alloc(&event_enabler
->parent
);
1319 event_notifier
= container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1322 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1323 /* Event will be enabled by enabler sync. */
1325 event
->priv
->registered
= 0;
1326 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1327 if (!event
->priv
->desc
) {
1329 goto register_error
;
1331 /* Populate lttng_event_notifier structure before event registration. */
1335 case LTTNG_KERNEL_ABI_KPROBE
:
1337 * Needs to be explicitly enabled after creation, since
1338 * we may want to apply filters.
1341 event
->priv
->registered
= 1;
1343 * Populate lttng_event_notifier structure before event
1347 ret
= lttng_kprobes_register_event(event_param
->u
.kprobe
.symbol_name
,
1348 event_param
->u
.kprobe
.symbol_name
,
1349 event_param
->u
.kprobe
.offset
,
1350 event_param
->u
.kprobe
.addr
,
1354 goto register_error
;
1356 ret
= try_module_get(event
->priv
->desc
->owner
);
1360 case LTTNG_KERNEL_ABI_SYSCALL
:
1362 * Needs to be explicitly enabled after creation, since
1363 * we may want to apply filters.
1366 event
->priv
->registered
= 0;
1367 event
->priv
->desc
= event_desc
;
1368 switch (event_param
->u
.syscall
.entryexit
) {
1369 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1371 goto register_error
;
1372 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1373 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1375 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1376 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1379 switch (event_param
->u
.syscall
.abi
) {
1380 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1382 goto register_error
;
1383 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1384 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1386 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1387 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1391 if (!event
->priv
->desc
) {
1393 goto register_error
;
1397 case LTTNG_KERNEL_ABI_UPROBE
:
1399 * Needs to be explicitly enabled after creation, since
1400 * we may want to apply filters.
1403 event
->priv
->registered
= 1;
1406 * Populate lttng_event_notifier structure before
1407 * event_notifier registration.
1411 ret
= lttng_uprobes_register_event(event_param
->name
,
1412 event_param
->u
.uprobe
.fd
,
1415 goto register_error
;
1416 ret
= try_module_get(event
->priv
->desc
->owner
);
1420 case LTTNG_KERNEL_ABI_KRETPROBE
:
1422 case LTTNG_KERNEL_ABI_FUNCTION
:
1424 case LTTNG_KERNEL_ABI_NOOP
:
1429 goto register_error
;
1432 list_add(&event
->priv
->node
, event_list_head
);
1433 hlist_add_head(&event
->priv
->hlist_node
, head
);
1435 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1437 goto register_error
;
1438 return event_notifier
;
1441 lttng_kernel_event_free(event
);
1445 return ERR_PTR(ret
);
1448 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1449 const struct lttng_kernel_event_desc
*event_desc
)
1451 switch (event_enabler
->enabler_type
) {
1452 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1454 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1455 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1456 struct lttng_kernel_event_recorder
*event_recorder
;
1458 event_recorder
= _lttng_kernel_event_recorder_create(event_recorder_enabler
, event_desc
);
1459 if (!event_recorder
)
1461 return &event_recorder
->parent
;
1463 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1465 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1466 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1467 struct lttng_kernel_event_notifier
*event_notifier
;
1469 event_notifier
= _lttng_kernel_event_notifier_create(event_notifier_enabler
, event_desc
);
1470 if (!event_notifier
)
1472 return &event_notifier
->parent
;
1479 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1480 const struct lttng_kernel_event_desc
*event_desc
)
1482 struct lttng_kernel_event_common
*event
;
1484 mutex_lock(&sessions_mutex
);
1485 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1486 mutex_unlock(&sessions_mutex
);
1492 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1493 const size_t *dim_indexes
, int32_t cpu
,
1494 int64_t *val
, bool *overflow
, bool *underflow
)
1496 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1497 cpu
, val
, overflow
, underflow
);
1500 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1501 const size_t *dim_indexes
, int64_t *val
,
1502 bool *overflow
, bool *underflow
)
1504 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1505 val
, overflow
, underflow
);
1508 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1509 const size_t *dim_indexes
)
1511 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1514 /* Only used for tracepoints for now. */
1516 void register_event(struct lttng_kernel_event_common
*event
)
1518 const struct lttng_kernel_event_desc
*desc
;
1521 if (event
->priv
->registered
)
1524 desc
= event
->priv
->desc
;
1525 switch (event
->priv
->instrumentation
) {
1526 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1527 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1528 desc
->tp_class
->probe_callback
,
1532 case LTTNG_KERNEL_ABI_SYSCALL
:
1533 ret
= lttng_syscall_filter_enable_event(event
);
1536 case LTTNG_KERNEL_ABI_KPROBE
:
1538 case LTTNG_KERNEL_ABI_UPROBE
:
1542 case LTTNG_KERNEL_ABI_KRETPROBE
:
1543 switch (event
->type
) {
1544 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1547 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1553 case LTTNG_KERNEL_ABI_FUNCTION
:
1555 case LTTNG_KERNEL_ABI_NOOP
:
1561 event
->priv
->registered
= 1;
1564 int _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1566 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1567 const struct lttng_kernel_event_desc
*desc
;
1570 if (!event_priv
->registered
)
1573 desc
= event_priv
->desc
;
1574 switch (event_priv
->instrumentation
) {
1575 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1576 ret
= lttng_wrapper_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1577 event_priv
->desc
->tp_class
->probe_callback
,
1581 case LTTNG_KERNEL_ABI_KPROBE
:
1582 lttng_kprobes_unregister_event(event
);
1586 case LTTNG_KERNEL_ABI_KRETPROBE
:
1587 switch (event
->type
) {
1588 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1589 lttng_kretprobes_unregister(event
);
1592 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1598 case LTTNG_KERNEL_ABI_SYSCALL
:
1599 ret
= lttng_syscall_filter_disable_event(event
);
1602 case LTTNG_KERNEL_ABI_NOOP
:
1603 switch (event
->type
) {
1604 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1607 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1613 case LTTNG_KERNEL_ABI_UPROBE
:
1614 lttng_uprobes_unregister_event(event
);
1618 case LTTNG_KERNEL_ABI_FUNCTION
:
1624 event_priv
->registered
= 0;
1629 * Only used internally at session destruction.
1632 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1634 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1635 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1637 lttng_free_event_filter_runtime(event
);
1638 /* Free event enabler refs */
1639 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1640 &event_priv
->enablers_ref_head
, node
)
1643 switch (event
->type
) {
1644 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1646 struct lttng_kernel_event_recorder
*event_recorder
=
1647 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1649 switch (event_priv
->instrumentation
) {
1650 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1651 lttng_event_desc_put(event_priv
->desc
);
1654 case LTTNG_KERNEL_ABI_KPROBE
:
1655 module_put(event_priv
->desc
->owner
);
1656 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1659 case LTTNG_KERNEL_ABI_KRETPROBE
:
1660 module_put(event_priv
->desc
->owner
);
1661 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1664 case LTTNG_KERNEL_ABI_SYSCALL
:
1667 case LTTNG_KERNEL_ABI_UPROBE
:
1668 module_put(event_priv
->desc
->owner
);
1669 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1672 case LTTNG_KERNEL_ABI_FUNCTION
:
1674 case LTTNG_KERNEL_ABI_NOOP
:
1679 list_del(&event_recorder
->priv
->parent
.node
);
1680 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1681 kmem_cache_free(event_recorder_cache
, event_recorder
);
1684 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1686 struct lttng_kernel_event_notifier
*event_notifier
=
1687 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1689 switch (event_notifier
->priv
->parent
.instrumentation
) {
1690 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1691 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1694 case LTTNG_KERNEL_ABI_KPROBE
:
1695 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1696 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1699 case LTTNG_KERNEL_ABI_SYSCALL
:
1702 case LTTNG_KERNEL_ABI_UPROBE
:
1703 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1704 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1707 case LTTNG_KERNEL_ABI_KRETPROBE
:
1709 case LTTNG_KERNEL_ABI_FUNCTION
:
1711 case LTTNG_KERNEL_ABI_NOOP
:
1716 list_del(&event_notifier
->priv
->parent
.node
);
1717 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1718 kmem_cache_free(event_notifier_cache
, event_notifier
);
1726 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1727 enum tracker_type tracker_type
)
1729 switch (tracker_type
) {
1731 return &session
->pid_tracker
;
1733 return &session
->vpid_tracker
;
1735 return &session
->uid_tracker
;
1737 return &session
->vuid_tracker
;
1739 return &session
->gid_tracker
;
1741 return &session
->vgid_tracker
;
1748 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1749 enum tracker_type tracker_type
, int id
)
1751 struct lttng_kernel_id_tracker
*tracker
;
1754 tracker
= get_tracker(session
, tracker_type
);
1759 mutex_lock(&sessions_mutex
);
1761 /* track all ids: destroy tracker. */
1762 lttng_id_tracker_destroy(tracker
, true);
1765 ret
= lttng_id_tracker_add(tracker
, id
);
1767 mutex_unlock(&sessions_mutex
);
1771 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1772 enum tracker_type tracker_type
, int id
)
1774 struct lttng_kernel_id_tracker
*tracker
;
1777 tracker
= get_tracker(session
, tracker_type
);
1782 mutex_lock(&sessions_mutex
);
1784 /* untrack all ids: replace by empty tracker. */
1785 ret
= lttng_id_tracker_empty_set(tracker
);
1787 ret
= lttng_id_tracker_del(tracker
, id
);
1789 mutex_unlock(&sessions_mutex
);
1794 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1796 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1797 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1798 struct lttng_id_hash_node
*e
;
1801 mutex_lock(&sessions_mutex
);
1803 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1804 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1806 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1812 /* ID tracker disabled. */
1813 if (iter
>= *pos
&& iter
== 0) {
1814 return id_tracker_p
; /* empty tracker */
1822 /* Called with sessions_mutex held. */
1824 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1826 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1827 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1828 struct lttng_id_hash_node
*e
;
1833 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1834 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1836 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1837 if (iter
++ >= *ppos
)
1842 /* ID tracker disabled. */
1843 if (iter
>= *ppos
&& iter
== 0)
1844 return p
; /* empty tracker */
1853 void id_list_stop(struct seq_file
*m
, void *p
)
1855 mutex_unlock(&sessions_mutex
);
1859 int id_list_show(struct seq_file
*m
, void *p
)
1861 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1862 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1865 if (p
== id_tracker_p
) {
1866 /* Tracker disabled. */
1869 const struct lttng_id_hash_node
*e
= p
;
1871 id
= lttng_id_tracker_get_node_id(e
);
1873 switch (id_tracker
->priv
->tracker_type
) {
1875 seq_printf(m
, "process { pid = %d; };\n", id
);
1878 seq_printf(m
, "process { vpid = %d; };\n", id
);
1881 seq_printf(m
, "user { uid = %d; };\n", id
);
1884 seq_printf(m
, "user { vuid = %d; };\n", id
);
1887 seq_printf(m
, "group { gid = %d; };\n", id
);
1890 seq_printf(m
, "group { vgid = %d; };\n", id
);
1893 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1899 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1900 .start
= id_list_start
,
1901 .next
= id_list_next
,
1902 .stop
= id_list_stop
,
1903 .show
= id_list_show
,
1907 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1909 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1913 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1915 struct seq_file
*m
= file
->private_data
;
1916 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1919 WARN_ON_ONCE(!id_tracker
);
1920 ret
= seq_release(inode
, file
);
1922 fput(id_tracker
->priv
->session
->priv
->file
);
1926 const struct file_operations lttng_tracker_ids_list_fops
= {
1927 .owner
= THIS_MODULE
,
1928 .open
= lttng_tracker_ids_list_open
,
1930 .llseek
= seq_lseek
,
1931 .release
= lttng_tracker_ids_list_release
,
1934 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1935 enum tracker_type tracker_type
)
1937 struct file
*tracker_ids_list_file
;
1941 file_fd
= lttng_get_unused_fd();
1947 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1948 <tng_tracker_ids_list_fops
,
1950 if (IS_ERR(tracker_ids_list_file
)) {
1951 ret
= PTR_ERR(tracker_ids_list_file
);
1954 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1956 goto refcount_error
;
1958 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1961 m
= tracker_ids_list_file
->private_data
;
1963 m
->private = get_tracker(session
, tracker_type
);
1964 BUG_ON(!m
->private);
1965 fd_install(file_fd
, tracker_ids_list_file
);
1970 atomic_long_dec(&session
->priv
->file
->f_count
);
1972 fput(tracker_ids_list_file
);
1974 put_unused_fd(file_fd
);
1980 * Enabler management.
1983 int lttng_match_enabler_star_glob(const char *desc_name
,
1984 const char *pattern
)
1986 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1987 desc_name
, LTTNG_SIZE_MAX
))
1993 int lttng_match_enabler_name(const char *desc_name
,
1996 if (strcmp(desc_name
, name
))
2002 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
2003 struct lttng_event_enabler_common
*enabler
)
2005 const char *desc_name
, *enabler_name
;
2006 bool compat
= false, entry
= false;
2008 enabler_name
= enabler
->event_param
.name
;
2009 switch (enabler
->event_param
.instrumentation
) {
2010 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2011 desc_name
= desc
->event_name
;
2012 switch (enabler
->format_type
) {
2013 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2014 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2015 case LTTNG_ENABLER_FORMAT_NAME
:
2016 return lttng_match_enabler_name(desc_name
, enabler_name
);
2022 case LTTNG_KERNEL_ABI_SYSCALL
:
2023 desc_name
= desc
->event_name
;
2024 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
2025 desc_name
+= strlen("compat_");
2028 if (!strncmp(desc_name
, "syscall_exit_",
2029 strlen("syscall_exit_"))) {
2030 desc_name
+= strlen("syscall_exit_");
2031 } else if (!strncmp(desc_name
, "syscall_entry_",
2032 strlen("syscall_entry_"))) {
2033 desc_name
+= strlen("syscall_entry_");
2039 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
2040 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
2042 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
2046 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
2053 switch (enabler
->event_param
.u
.syscall
.abi
) {
2054 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
2056 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
2060 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
2067 switch (enabler
->event_param
.u
.syscall
.match
) {
2068 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
2069 switch (enabler
->format_type
) {
2070 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
2071 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
2072 case LTTNG_ENABLER_FORMAT_NAME
:
2073 return lttng_match_enabler_name(desc_name
, enabler_name
);
2078 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
2079 return -EINVAL
; /* Not implemented. */
2091 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
2092 struct lttng_event_enabler_common
*enabler
)
2096 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
2104 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
2105 struct lttng_kernel_event_common
*event
)
2107 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2110 switch (event_enabler
->enabler_type
) {
2111 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2113 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2114 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2115 struct lttng_kernel_event_recorder
*event_recorder
=
2116 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2118 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2119 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2124 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2126 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2127 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2128 struct lttng_kernel_event_notifier
*event_notifier
=
2129 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2131 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
2132 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2133 && event
->priv
->user_token
== event_enabler
->user_token
)
2144 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
2145 const struct lttng_kernel_event_desc
*desc
,
2146 struct lttng_kernel_event_common
*event
)
2148 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2151 switch (event_enabler
->enabler_type
) {
2152 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2154 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2155 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2156 struct lttng_kernel_event_recorder
*event_recorder
=
2157 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2159 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
2164 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2166 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2167 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2168 struct lttng_kernel_event_notifier
*event_notifier
=
2169 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2171 if (event
->priv
->desc
== desc
2172 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2173 && event
->priv
->user_token
== event_enabler
->user_token
)
2184 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2185 const char *event_name
,
2186 struct lttng_kernel_event_common
*event
)
2188 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2191 switch (event_enabler
->enabler_type
) {
2192 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2194 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2195 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2196 struct lttng_kernel_event_recorder
*event_recorder
=
2197 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2199 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2200 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2205 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2207 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2208 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2209 struct lttng_kernel_event_notifier
*event_notifier
=
2210 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2212 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2213 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2214 && event
->priv
->user_token
== event_enabler
->user_token
)
2226 struct lttng_enabler_ref
*lttng_enabler_ref(
2227 struct list_head
*enablers_ref_list
,
2228 struct lttng_event_enabler_common
*enabler
)
2230 struct lttng_enabler_ref
*enabler_ref
;
2232 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2233 if (enabler_ref
->ref
== enabler
)
2240 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2242 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2243 struct lttng_kernel_probe_desc
*probe_desc
;
2244 const struct lttng_kernel_event_desc
*desc
;
2245 struct list_head
*probe_list
;
2248 probe_list
= lttng_get_probe_list_head();
2250 * For each probe event, if we find that a probe event matches
2251 * our enabler, create an associated lttng_event if not
2254 list_for_each_entry(probe_desc
, probe_list
, head
) {
2255 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2257 struct hlist_head
*head
;
2258 struct lttng_kernel_event_common
*event
;
2259 struct lttng_kernel_event_common_private
*event_priv
;
2261 desc
= probe_desc
->event_desc
[i
];
2262 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2266 * Check if already created.
2268 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2269 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2270 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
))
2277 * We need to create an event for this event probe.
2279 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2281 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2282 probe_desc
->event_desc
[i
]->event_name
);
2289 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2293 ret
= lttng_syscalls_register_event(event_enabler
);
2298 * Create event if it is missing and present in the list of tracepoint probes.
2299 * Should be called with sessions mutex held.
2302 void lttng_create_event_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2304 switch (event_enabler
->event_param
.instrumentation
) {
2305 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2306 lttng_create_tracepoint_event_if_missing(event_enabler
);
2309 case LTTNG_KERNEL_ABI_SYSCALL
:
2310 lttng_create_syscall_event_if_missing(event_enabler
);
2320 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2321 struct lttng_kernel_event_common
*event
)
2323 /* Link filter bytecodes if not linked yet. */
2324 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2325 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2329 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2330 struct lttng_kernel_event_common
*event
)
2332 switch (event_enabler
->enabler_type
) {
2333 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2335 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2337 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2338 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2339 struct lttng_kernel_event_notifier
*event_notifier
=
2340 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2342 /* Link capture bytecodes if not linked yet. */
2343 lttng_enabler_link_bytecode(event
->priv
->desc
,
2344 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2345 &event_notifier_enabler
->capture_bytecode_head
);
2346 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2355 * Create events associated with an event_enabler (if not already present),
2356 * and add backward reference from the event to the enabler.
2357 * Should be called with sessions mutex held.
2360 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2362 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2363 struct lttng_kernel_event_common_private
*event_priv
;
2365 lttng_syscall_table_set_wildcard_all(event_enabler
);
2367 /* First ensure that probe events are created for this enabler. */
2368 lttng_create_event_if_missing(event_enabler
);
2370 /* Link the created event with its associated enabler. */
2371 list_for_each_entry(event_priv
, event_list_head
, node
) {
2372 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2373 struct lttng_enabler_ref
*enabler_ref
;
2375 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2378 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2381 * If no backward ref, create it.
2382 * Add backward ref from event_notifier to enabler.
2384 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2388 enabler_ref
->ref
= event_enabler
;
2389 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2392 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2393 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2399 * Called at module load: connect the probe on all enablers matching
2401 * Called with sessions lock held.
2403 int lttng_fix_pending_events(void)
2405 struct lttng_kernel_session_private
*session_priv
;
2407 list_for_each_entry(session_priv
, &sessions
, list
)
2408 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2412 static bool lttng_event_notifier_group_has_active_event_notifiers(
2413 struct lttng_event_notifier_group
*event_notifier_group
)
2415 struct lttng_event_enabler_common
*event_enabler
;
2417 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2418 if (event_enabler
->enabled
)
2424 bool lttng_event_notifier_active(void)
2426 struct lttng_event_notifier_group
*event_notifier_group
;
2428 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2429 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2435 int lttng_fix_pending_event_notifiers(void)
2437 struct lttng_event_notifier_group
*event_notifier_group
;
2439 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2440 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2444 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2445 enum lttng_enabler_format_type format_type
,
2446 struct lttng_kernel_abi_event
*event_param
,
2447 struct lttng_kernel_channel_buffer
*chan
)
2449 struct lttng_event_recorder_enabler
*event_enabler
;
2451 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2454 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2455 event_enabler
->parent
.format_type
= format_type
;
2456 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2457 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2458 sizeof(event_enabler
->parent
.event_param
));
2459 event_enabler
->chan
= chan
;
2461 event_enabler
->parent
.enabled
= 0;
2462 return event_enabler
;
2465 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2466 struct lttng_event_recorder_enabler
*event_enabler
)
2468 mutex_lock(&sessions_mutex
);
2469 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2470 event_enabler
->parent
.published
= true;
2471 lttng_session_lazy_sync_event_enablers(session
);
2472 mutex_unlock(&sessions_mutex
);
2475 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2477 mutex_lock(&sessions_mutex
);
2478 event_enabler
->enabled
= 1;
2479 lttng_event_enabler_sync(event_enabler
);
2480 mutex_unlock(&sessions_mutex
);
2484 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2486 mutex_lock(&sessions_mutex
);
2487 event_enabler
->enabled
= 0;
2488 lttng_event_enabler_sync(event_enabler
);
2489 mutex_unlock(&sessions_mutex
);
2494 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2495 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2497 struct lttng_kernel_bytecode_node
*bytecode_node
;
2498 uint32_t bytecode_len
;
2501 ret
= get_user(bytecode_len
, &bytecode
->len
);
2504 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2508 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2509 sizeof(*bytecode
) + bytecode_len
);
2513 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2514 bytecode_node
->enabler
= enabler
;
2515 /* Enforce length based on allocated size */
2516 bytecode_node
->bc
.len
= bytecode_len
;
2517 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2522 lttng_kvfree(bytecode_node
);
2526 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2527 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2530 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2533 lttng_event_enabler_sync(event_enabler
);
2540 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2541 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2544 switch (event
->priv
->instrumentation
) {
2545 case LTTNG_KERNEL_ABI_UPROBE
:
2546 return lttng_uprobes_event_add_callsite(event
, callsite
);
2553 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2555 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2557 /* Destroy filter bytecode */
2558 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2559 &enabler
->filter_bytecode_head
, node
) {
2560 lttng_kvfree(filter_node
);
2564 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2566 lttng_enabler_destroy(event_enabler
);
2567 if (event_enabler
->published
)
2568 list_del(&event_enabler
->node
);
2570 switch (event_enabler
->enabler_type
) {
2571 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2573 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2574 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2576 kfree(event_recorder_enabler
);
2579 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2581 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2582 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2584 kfree(event_notifier_enabler
);
2592 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2593 enum lttng_enabler_format_type format_type
,
2594 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2595 struct lttng_event_notifier_group
*event_notifier_group
)
2597 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2599 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2600 if (!event_notifier_enabler
)
2603 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2604 event_notifier_enabler
->parent
.format_type
= format_type
;
2605 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2606 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2608 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2609 event_notifier_enabler
->num_captures
= 0;
2611 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2612 sizeof(event_notifier_enabler
->parent
.event_param
));
2614 event_notifier_enabler
->parent
.enabled
= 0;
2615 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2616 event_notifier_enabler
->group
= event_notifier_group
;
2617 return event_notifier_enabler
;
2620 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2621 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2623 mutex_lock(&sessions_mutex
);
2624 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2625 event_notifier_enabler
->parent
.published
= true;
2626 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2627 mutex_unlock(&sessions_mutex
);
2630 int lttng_event_notifier_enabler_enable(
2631 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2633 mutex_lock(&sessions_mutex
);
2634 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2635 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2636 mutex_unlock(&sessions_mutex
);
2640 int lttng_event_notifier_enabler_disable(
2641 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2643 mutex_lock(&sessions_mutex
);
2644 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2645 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2646 mutex_unlock(&sessions_mutex
);
2650 int lttng_event_notifier_enabler_attach_capture_bytecode(
2651 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2652 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2654 struct lttng_kernel_bytecode_node
*bytecode_node
;
2655 struct lttng_event_enabler_common
*enabler
=
2656 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2657 uint32_t bytecode_len
;
2660 ret
= get_user(bytecode_len
, &bytecode
->len
);
2664 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2669 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2670 sizeof(*bytecode
) + bytecode_len
);
2674 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2675 bytecode_node
->enabler
= enabler
;
2677 /* Enforce length based on allocated size */
2678 bytecode_node
->bc
.len
= bytecode_len
;
2679 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2681 event_notifier_enabler
->num_captures
++;
2683 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2687 lttng_kvfree(bytecode_node
);
2693 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2695 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2696 struct lttng_kernel_bytecode_runtime
*runtime
;
2697 struct lttng_enabler_ref
*enabler_ref
;
2699 /* Check if has enablers without bytecode enabled */
2700 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2701 if (enabler_ref
->ref
->enabled
2702 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2703 has_enablers_without_filter_bytecode
= 1;
2707 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2709 /* Enable filters */
2710 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2711 lttng_bytecode_sync_state(runtime
);
2714 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2718 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2720 switch (event
->type
) {
2721 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2723 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2725 struct lttng_kernel_event_notifier
*event_notifier
=
2726 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2727 struct lttng_kernel_bytecode_runtime
*runtime
;
2728 int nr_captures
= 0;
2730 /* Enable captures */
2731 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2732 lttng_bytecode_sync_state(runtime
);
2735 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2744 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2746 struct lttng_enabler_ref
*enabler_ref
;
2747 bool enabled
= false;
2749 switch (event
->priv
->instrumentation
) {
2750 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2752 case LTTNG_KERNEL_ABI_SYSCALL
:
2754 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2755 if (enabler_ref
->ref
->enabled
) {
2766 switch (event
->type
) {
2767 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2769 struct lttng_kernel_event_recorder
*event_recorder
=
2770 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2773 * Enabled state is based on union of enablers, with
2774 * intersection of session and channel transient enable
2777 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2779 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2788 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2790 switch (event
->priv
->instrumentation
) {
2791 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2793 case LTTNG_KERNEL_ABI_SYSCALL
:
2797 /* Not handled with lazy sync. */
2803 * Should be called with sessions mutex held.
2806 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2807 struct list_head
*event_list
)
2809 struct lttng_kernel_event_common_private
*event_priv
;
2810 struct lttng_event_enabler_common
*event_enabler
;
2812 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2813 lttng_event_enabler_ref_events(event_enabler
);
2816 * For each event, if at least one of its enablers is enabled,
2817 * and its channel and session transient states are enabled, we
2818 * enable the event, else we disable it.
2820 list_for_each_entry(event_priv
, event_list
, node
) {
2821 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2824 if (!lttng_event_is_lazy_sync(event
))
2827 enabled
= lttng_get_event_enabled_state(event
);
2828 WRITE_ONCE(event
->enabled
, enabled
);
2830 * Sync tracepoint registration with event enabled state.
2833 register_event(event
);
2835 _lttng_event_unregister(event
);
2838 lttng_event_sync_filter_state(event
);
2839 lttng_event_sync_capture_state(event
);
2844 * lttng_session_sync_event_enablers should be called just before starting a
2848 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2850 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2854 * Apply enablers to session events, adding events to session if need
2855 * be. It is required after each modification applied to an active
2856 * session, and right before session "start".
2857 * "lazy" sync means we only sync if required.
2858 * Should be called with sessions mutex held.
2861 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2863 /* We can skip if session is not active */
2864 if (!session
->active
)
2866 lttng_session_sync_event_enablers(session
);
2870 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2872 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2876 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2878 switch (event_enabler
->enabler_type
) {
2879 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2881 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2882 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2883 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2886 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2888 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2889 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2890 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2899 * Serialize at most one packet worth of metadata into a metadata
2901 * We grab the metadata cache mutex to get exclusive access to our metadata
2902 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2903 * allows us to do racy operations such as looking for remaining space left in
2904 * packet and write, since mutual exclusion protects us from concurrent writes.
2905 * Mutual exclusion on the metadata cache allow us to read the cache content
2906 * without racing against reallocation of the cache by updates.
2907 * Returns the number of bytes written in the channel, 0 if no data
2908 * was written and a negative value on error.
2910 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2911 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2913 struct lttng_kernel_ring_buffer_ctx ctx
;
2915 size_t len
, reserve_len
;
2918 * Ensure we support mutiple get_next / put sequences followed by
2919 * put_next. The metadata cache lock protects reading the metadata
2920 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2921 * "flush" operations on the buffer invoked by different processes.
2922 * Moreover, since the metadata cache memory can be reallocated, we
2923 * need to have exclusive access against updates even though we only
2926 mutex_lock(&stream
->metadata_cache
->lock
);
2927 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2928 if (stream
->metadata_in
!= stream
->metadata_out
)
2931 /* Metadata regenerated, change the version. */
2932 if (stream
->metadata_cache
->version
!= stream
->version
)
2933 stream
->version
= stream
->metadata_cache
->version
;
2935 len
= stream
->metadata_cache
->metadata_written
-
2936 stream
->metadata_in
;
2939 reserve_len
= min_t(size_t,
2940 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2942 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2943 sizeof(char), NULL
);
2945 * If reservation failed, return an error to the caller.
2947 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2949 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2950 stream
->coherent
= false;
2953 stream
->transport
->ops
.event_write(&ctx
,
2954 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2956 stream
->transport
->ops
.event_commit(&ctx
);
2957 stream
->metadata_in
+= reserve_len
;
2958 if (reserve_len
< len
)
2959 stream
->coherent
= false;
2961 stream
->coherent
= true;
2966 *coherent
= stream
->coherent
;
2967 mutex_unlock(&stream
->metadata_cache
->lock
);
2972 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2974 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2975 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2979 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2981 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2982 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2983 struct lttng_metadata_stream
*stream
;
2985 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2986 wake_up_interruptible(&stream
->read_wait
);
2987 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2992 * Write the metadata to the metadata cache.
2993 * Must be called with sessions_mutex held.
2994 * The metadata cache lock protects us from concurrent read access from
2995 * thread outputting metadata content to ring buffer.
2996 * The content of the printf is printed as a single atomic metadata
2999 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
3000 const char *fmt
, ...)
3006 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
3009 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
3015 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
3016 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
3017 session
->priv
->metadata_cache
->cache_alloc
) {
3018 char *tmp_cache_realloc
;
3019 unsigned int tmp_cache_alloc_size
;
3021 tmp_cache_alloc_size
= max_t(unsigned int,
3022 session
->priv
->metadata_cache
->cache_alloc
+ len
,
3023 session
->priv
->metadata_cache
->cache_alloc
<< 1);
3024 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
3025 if (!tmp_cache_realloc
)
3027 if (session
->priv
->metadata_cache
->data
) {
3028 memcpy(tmp_cache_realloc
,
3029 session
->priv
->metadata_cache
->data
,
3030 session
->priv
->metadata_cache
->cache_alloc
);
3031 vfree(session
->priv
->metadata_cache
->data
);
3034 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
3035 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
3037 memcpy(session
->priv
->metadata_cache
->data
+
3038 session
->priv
->metadata_cache
->metadata_written
,
3040 session
->priv
->metadata_cache
->metadata_written
+= len
;
3051 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
3055 for (i
= 0; i
< nesting
; i
++) {
3058 ret
= lttng_metadata_printf(session
, " ");
3067 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
3068 const struct lttng_kernel_event_field
*field
,
3071 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3075 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
3076 const struct lttng_kernel_type_integer
*type
,
3077 enum lttng_kernel_string_encoding parent_encoding
,
3082 ret
= print_tabs(session
, nesting
);
3085 ret
= lttng_metadata_printf(session
,
3086 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3090 (parent_encoding
== lttng_kernel_string_encoding_none
)
3092 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3096 #if __BYTE_ORDER == __BIG_ENDIAN
3097 type
->reverse_byte_order
? " byte_order = le;" : ""
3099 type
->reverse_byte_order
? " byte_order = be;" : ""
3106 * Must be called with sessions_mutex held.
3109 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
3110 const struct lttng_kernel_type_struct
*type
,
3113 const char *prev_field_name
= NULL
;
3115 uint32_t i
, nr_fields
;
3116 unsigned int alignment
;
3118 ret
= print_tabs(session
, nesting
);
3121 ret
= lttng_metadata_printf(session
,
3125 nr_fields
= type
->nr_fields
;
3126 for (i
= 0; i
< nr_fields
; i
++) {
3127 const struct lttng_kernel_event_field
*iter_field
;
3129 iter_field
= type
->fields
[i
];
3130 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
3134 ret
= print_tabs(session
, nesting
);
3137 alignment
= type
->alignment
;
3139 ret
= lttng_metadata_printf(session
,
3143 ret
= lttng_metadata_printf(session
,
3150 * Must be called with sessions_mutex held.
3153 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
3154 const struct lttng_kernel_event_field
*field
,
3159 ret
= _lttng_struct_type_statedump(session
,
3160 lttng_kernel_get_type_struct(field
->type
), nesting
);
3163 return lttng_field_name_statedump(session
, field
, nesting
);
3167 * Must be called with sessions_mutex held.
3170 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
3171 const struct lttng_kernel_type_variant
*type
,
3173 const char *prev_field_name
)
3175 const char *tag_name
;
3177 uint32_t i
, nr_choices
;
3179 tag_name
= type
->tag_name
;
3181 tag_name
= prev_field_name
;
3185 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3187 if (type
->alignment
!= 0)
3189 ret
= print_tabs(session
, nesting
);
3192 ret
= lttng_metadata_printf(session
,
3193 "variant <_%s> {\n",
3197 nr_choices
= type
->nr_choices
;
3198 for (i
= 0; i
< nr_choices
; i
++) {
3199 const struct lttng_kernel_event_field
*iter_field
;
3201 iter_field
= type
->choices
[i
];
3202 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3206 ret
= print_tabs(session
, nesting
);
3209 ret
= lttng_metadata_printf(session
,
3215 * Must be called with sessions_mutex held.
3218 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3219 const struct lttng_kernel_event_field
*field
,
3221 const char *prev_field_name
)
3225 ret
= _lttng_variant_type_statedump(session
,
3226 lttng_kernel_get_type_variant(field
->type
), nesting
,
3230 return lttng_field_name_statedump(session
, field
, nesting
);
3234 * Must be called with sessions_mutex held.
3237 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3238 const struct lttng_kernel_event_field
*field
,
3242 const struct lttng_kernel_type_array
*array_type
;
3243 const struct lttng_kernel_type_common
*elem_type
;
3245 array_type
= lttng_kernel_get_type_array(field
->type
);
3246 WARN_ON_ONCE(!array_type
);
3248 if (array_type
->alignment
) {
3249 ret
= print_tabs(session
, nesting
);
3252 ret
= lttng_metadata_printf(session
,
3253 "struct { } align(%u) _%s_padding;\n",
3254 array_type
->alignment
* CHAR_BIT
,
3260 * Nested compound types: Only array of structures and variants are
3261 * currently supported.
3263 elem_type
= array_type
->elem_type
;
3264 switch (elem_type
->type
) {
3265 case lttng_kernel_type_integer
:
3266 case lttng_kernel_type_struct
:
3267 case lttng_kernel_type_variant
:
3268 ret
= _lttng_type_statedump(session
, elem_type
,
3269 array_type
->encoding
, nesting
);
3277 ret
= lttng_metadata_printf(session
,
3280 array_type
->length
);
3285 * Must be called with sessions_mutex held.
3288 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3289 const struct lttng_kernel_event_field
*field
,
3291 const char *prev_field_name
)
3294 const char *length_name
;
3295 const struct lttng_kernel_type_sequence
*sequence_type
;
3296 const struct lttng_kernel_type_common
*elem_type
;
3298 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3299 WARN_ON_ONCE(!sequence_type
);
3301 length_name
= sequence_type
->length_name
;
3303 length_name
= prev_field_name
;
3307 if (sequence_type
->alignment
) {
3308 ret
= print_tabs(session
, nesting
);
3311 ret
= lttng_metadata_printf(session
,
3312 "struct { } align(%u) _%s_padding;\n",
3313 sequence_type
->alignment
* CHAR_BIT
,
3320 * Nested compound types: Only array of structures and variants are
3321 * currently supported.
3323 elem_type
= sequence_type
->elem_type
;
3324 switch (elem_type
->type
) {
3325 case lttng_kernel_type_integer
:
3326 case lttng_kernel_type_struct
:
3327 case lttng_kernel_type_variant
:
3328 ret
= _lttng_type_statedump(session
, elem_type
,
3329 sequence_type
->encoding
, nesting
);
3337 ret
= lttng_metadata_printf(session
,
3345 * Must be called with sessions_mutex held.
3348 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3349 const struct lttng_kernel_type_enum
*type
,
3352 const struct lttng_kernel_enum_desc
*enum_desc
;
3353 const struct lttng_kernel_type_common
*container_type
;
3355 unsigned int i
, nr_entries
;
3357 container_type
= type
->container_type
;
3358 if (container_type
->type
!= lttng_kernel_type_integer
) {
3362 enum_desc
= type
->desc
;
3363 nr_entries
= enum_desc
->nr_entries
;
3365 ret
= print_tabs(session
, nesting
);
3368 ret
= lttng_metadata_printf(session
, "enum : ");
3371 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3372 lttng_kernel_string_encoding_none
, 0);
3375 ret
= lttng_metadata_printf(session
, " {\n");
3378 /* Dump all entries */
3379 for (i
= 0; i
< nr_entries
; i
++) {
3380 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3383 ret
= print_tabs(session
, nesting
+ 1);
3386 ret
= lttng_metadata_printf(session
,
3390 len
= strlen(entry
->string
);
3391 /* Escape the character '"' */
3392 for (j
= 0; j
< len
; j
++) {
3393 char c
= entry
->string
[j
];
3397 ret
= lttng_metadata_printf(session
,
3401 ret
= lttng_metadata_printf(session
,
3405 ret
= lttng_metadata_printf(session
,
3412 ret
= lttng_metadata_printf(session
, "\"");
3416 if (entry
->options
.is_auto
) {
3417 ret
= lttng_metadata_printf(session
, ",\n");
3421 ret
= lttng_metadata_printf(session
,
3425 if (entry
->start
.signedness
)
3426 ret
= lttng_metadata_printf(session
,
3427 "%lld", (long long) entry
->start
.value
);
3429 ret
= lttng_metadata_printf(session
,
3430 "%llu", entry
->start
.value
);
3433 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3435 == entry
->end
.value
) {
3436 ret
= lttng_metadata_printf(session
,
3439 if (entry
->end
.signedness
) {
3440 ret
= lttng_metadata_printf(session
,
3442 (long long) entry
->end
.value
);
3444 ret
= lttng_metadata_printf(session
,
3453 ret
= print_tabs(session
, nesting
);
3456 ret
= lttng_metadata_printf(session
, "}");
3462 * Must be called with sessions_mutex held.
3465 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3466 const struct lttng_kernel_event_field
*field
,
3470 const struct lttng_kernel_type_enum
*enum_type
;
3472 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3473 WARN_ON_ONCE(!enum_type
);
3474 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3477 return lttng_field_name_statedump(session
, field
, nesting
);
3481 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3482 const struct lttng_kernel_event_field
*field
,
3487 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3488 lttng_kernel_string_encoding_none
, nesting
);
3491 return lttng_field_name_statedump(session
, field
, nesting
);
3495 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3496 const struct lttng_kernel_type_string
*type
,
3501 /* Default encoding is UTF8 */
3502 ret
= print_tabs(session
, nesting
);
3505 ret
= lttng_metadata_printf(session
,
3507 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3508 " { encoding = ASCII; }" : "");
3513 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3514 const struct lttng_kernel_event_field
*field
,
3517 const struct lttng_kernel_type_string
*string_type
;
3520 string_type
= lttng_kernel_get_type_string(field
->type
);
3521 WARN_ON_ONCE(!string_type
);
3522 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3525 return lttng_field_name_statedump(session
, field
, nesting
);
3529 * Must be called with sessions_mutex held.
3532 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3533 const struct lttng_kernel_type_common
*type
,
3534 enum lttng_kernel_string_encoding parent_encoding
,
3539 switch (type
->type
) {
3540 case lttng_kernel_type_integer
:
3541 ret
= _lttng_integer_type_statedump(session
,
3542 lttng_kernel_get_type_integer(type
),
3543 parent_encoding
, nesting
);
3545 case lttng_kernel_type_enum
:
3546 ret
= _lttng_enum_type_statedump(session
,
3547 lttng_kernel_get_type_enum(type
),
3550 case lttng_kernel_type_string
:
3551 ret
= _lttng_string_type_statedump(session
,
3552 lttng_kernel_get_type_string(type
),
3555 case lttng_kernel_type_struct
:
3556 ret
= _lttng_struct_type_statedump(session
,
3557 lttng_kernel_get_type_struct(type
),
3560 case lttng_kernel_type_variant
:
3561 ret
= _lttng_variant_type_statedump(session
,
3562 lttng_kernel_get_type_variant(type
),
3566 /* Nested arrays and sequences are not supported yet. */
3567 case lttng_kernel_type_array
:
3568 case lttng_kernel_type_sequence
:
3577 * Must be called with sessions_mutex held.
3580 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3581 const struct lttng_kernel_event_field
*field
,
3583 const char **prev_field_name_p
)
3585 const char *prev_field_name
= NULL
;
3588 if (prev_field_name_p
)
3589 prev_field_name
= *prev_field_name_p
;
3590 switch (field
->type
->type
) {
3591 case lttng_kernel_type_integer
:
3592 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3594 case lttng_kernel_type_enum
:
3595 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3597 case lttng_kernel_type_string
:
3598 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3600 case lttng_kernel_type_struct
:
3601 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3603 case lttng_kernel_type_array
:
3604 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3606 case lttng_kernel_type_sequence
:
3607 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3609 case lttng_kernel_type_variant
:
3610 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3617 if (prev_field_name_p
)
3618 *prev_field_name_p
= field
->name
;
3623 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3624 struct lttng_kernel_ctx
*ctx
)
3626 const char *prev_field_name
= NULL
;
3632 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3633 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3635 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3643 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3644 struct lttng_kernel_event_recorder
*event_recorder
)
3646 const char *prev_field_name
= NULL
;
3647 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3651 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3652 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3654 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3662 * Must be called with sessions_mutex held.
3663 * The entire event metadata is printed as a single atomic metadata
3667 int _lttng_event_metadata_statedump(struct lttng_kernel_session
*session
,
3668 struct lttng_kernel_channel_buffer
*chan
,
3669 struct lttng_kernel_event_recorder
*event_recorder
)
3673 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3675 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3678 lttng_metadata_begin(session
);
3680 ret
= lttng_metadata_printf(session
,
3684 " stream_id = %u;\n",
3685 event_recorder
->priv
->parent
.desc
->event_name
,
3686 event_recorder
->priv
->id
,
3687 event_recorder
->chan
->priv
->id
);
3691 ret
= lttng_metadata_printf(session
,
3692 " fields := struct {\n"
3697 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3702 * LTTng space reservation can only reserve multiples of the
3705 ret
= lttng_metadata_printf(session
,
3711 event_recorder
->priv
->metadata_dumped
= 1;
3713 lttng_metadata_end(session
);
3719 * Must be called with sessions_mutex held.
3720 * The entire channel metadata is printed as a single atomic metadata
3724 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3725 struct lttng_kernel_channel_buffer
*chan
)
3729 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3732 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3735 lttng_metadata_begin(session
);
3737 WARN_ON_ONCE(!chan
->priv
->header_type
);
3738 ret
= lttng_metadata_printf(session
,
3741 " event.header := %s;\n"
3742 " packet.context := struct packet_context;\n",
3744 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3745 "struct event_header_large");
3749 if (chan
->priv
->ctx
) {
3750 ret
= lttng_metadata_printf(session
,
3751 " event.context := struct {\n");
3755 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3758 if (chan
->priv
->ctx
) {
3759 ret
= lttng_metadata_printf(session
,
3765 ret
= lttng_metadata_printf(session
,
3768 chan
->priv
->metadata_dumped
= 1;
3770 lttng_metadata_end(session
);
3775 * Must be called with sessions_mutex held.
3778 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3780 return lttng_metadata_printf(session
,
3781 "struct packet_context {\n"
3782 " uint64_clock_monotonic_t timestamp_begin;\n"
3783 " uint64_clock_monotonic_t timestamp_end;\n"
3784 " uint64_t content_size;\n"
3785 " uint64_t packet_size;\n"
3786 " uint64_t packet_seq_num;\n"
3787 " unsigned long events_discarded;\n"
3788 " uint32_t cpu_id;\n"
3795 * id: range: 0 - 30.
3796 * id 31 is reserved to indicate an extended header.
3799 * id: range: 0 - 65534.
3800 * id 65535 is reserved to indicate an extended header.
3802 * Must be called with sessions_mutex held.
3805 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3807 return lttng_metadata_printf(session
,
3808 "struct event_header_compact {\n"
3809 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3812 " uint27_clock_monotonic_t timestamp;\n"
3816 " uint64_clock_monotonic_t timestamp;\n"
3821 "struct event_header_large {\n"
3822 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3825 " uint32_clock_monotonic_t timestamp;\n"
3829 " uint64_clock_monotonic_t timestamp;\n"
3833 lttng_alignof(uint32_t) * CHAR_BIT
,
3834 lttng_alignof(uint16_t) * CHAR_BIT
3839 * Approximation of NTP time of day to clock monotonic correlation,
3840 * taken at start of trace.
3841 * Yes, this is only an approximation. Yes, we can (and will) do better
3842 * in future versions.
3843 * This function may return a negative offset. It may happen if the
3844 * system sets the REALTIME clock to 0 after boot.
3846 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3850 int64_t measure_clock_offset(void)
3852 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3853 uint64_t tcf
= trace_clock_freq();
3855 unsigned long flags
;
3856 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3857 struct timespec64 rts
= { 0, 0 };
3859 struct timespec rts
= { 0, 0 };
3862 /* Disable interrupts to increase correlation precision. */
3863 local_irq_save(flags
);
3864 monotonic
[0] = trace_clock_read64();
3865 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3866 ktime_get_real_ts64(&rts
);
3868 getnstimeofday(&rts
);
3870 monotonic
[1] = trace_clock_read64();
3871 local_irq_restore(flags
);
3873 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3874 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3875 if (tcf
== NSEC_PER_SEC
) {
3876 realtime
+= rts
.tv_nsec
;
3878 uint64_t n
= rts
.tv_nsec
* tcf
;
3880 do_div(n
, NSEC_PER_SEC
);
3883 offset
= (int64_t) realtime
- monotonic_avg
;
3888 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3896 while (cur
!= '\0') {
3899 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3903 ret
= lttng_metadata_printf(session
, "%c", '\\');
3906 /* We still print the current char */
3909 ret
= lttng_metadata_printf(session
, "%c", cur
);
3923 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3924 const char *field_value
)
3928 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3932 ret
= print_escaped_ctf_string(session
, field_value
);
3936 ret
= lttng_metadata_printf(session
, "\";\n");
3943 * Output metadata into this session's metadata buffers.
3944 * Must be called with sessions_mutex held.
3947 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3949 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3950 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3951 const char *product_uuid
;
3952 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3953 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3956 if (!LTTNG_READ_ONCE(session
->active
))
3959 lttng_metadata_begin(session
);
3961 if (session
->priv
->metadata_dumped
)
3964 snprintf(uuid_s
, sizeof(uuid_s
),
3965 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3966 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3967 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3968 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3969 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3971 ret
= lttng_metadata_printf(session
,
3972 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3973 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3974 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3975 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3976 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3977 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3978 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3984 " byte_order = %s;\n"
3985 " packet.header := struct {\n"
3986 " uint32_t magic;\n"
3987 " uint8_t uuid[16];\n"
3988 " uint32_t stream_id;\n"
3989 " uint64_t stream_instance_id;\n"
3992 lttng_alignof(uint8_t) * CHAR_BIT
,
3993 lttng_alignof(uint16_t) * CHAR_BIT
,
3994 lttng_alignof(uint32_t) * CHAR_BIT
,
3995 lttng_alignof(uint64_t) * CHAR_BIT
,
3996 sizeof(unsigned long) * CHAR_BIT
,
3997 lttng_alignof(unsigned long) * CHAR_BIT
,
4001 #if __BYTE_ORDER == __BIG_ENDIAN
4010 ret
= lttng_metadata_printf(session
,
4012 " hostname = \"%s\";\n"
4013 " domain = \"kernel\";\n"
4014 " sysname = \"%s\";\n"
4015 " kernel_release = \"%s\";\n"
4016 " kernel_version = \"%s\";\n"
4017 " tracer_name = \"lttng-modules\";\n"
4018 " tracer_major = %d;\n"
4019 " tracer_minor = %d;\n"
4020 " tracer_patchlevel = %d;\n"
4021 " trace_buffering_scheme = \"global\";\n",
4022 current
->nsproxy
->uts_ns
->name
.nodename
,
4026 LTTNG_MODULES_MAJOR_VERSION
,
4027 LTTNG_MODULES_MINOR_VERSION
,
4028 LTTNG_MODULES_PATCHLEVEL_VERSION
4033 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
4036 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
4037 session
->priv
->creation_time
);
4041 /* Add the product UUID to the 'env' section */
4042 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
4044 ret
= lttng_metadata_printf(session
,
4045 " product_uuid = \"%s\";\n",
4052 /* Close the 'env' section */
4053 ret
= lttng_metadata_printf(session
, "};\n\n");
4057 ret
= lttng_metadata_printf(session
,
4059 " name = \"%s\";\n",
4065 if (!trace_clock_uuid(clock_uuid_s
)) {
4066 ret
= lttng_metadata_printf(session
,
4067 " uuid = \"%s\";\n",
4074 ret
= lttng_metadata_printf(session
,
4075 " description = \"%s\";\n"
4076 " freq = %llu; /* Frequency, in Hz */\n"
4077 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4080 trace_clock_description(),
4081 (unsigned long long) trace_clock_freq(),
4082 (long long) measure_clock_offset()
4087 ret
= lttng_metadata_printf(session
,
4088 "typealias integer {\n"
4089 " size = 27; align = 1; signed = false;\n"
4090 " map = clock.%s.value;\n"
4091 "} := uint27_clock_monotonic_t;\n"
4093 "typealias integer {\n"
4094 " size = 32; align = %u; signed = false;\n"
4095 " map = clock.%s.value;\n"
4096 "} := uint32_clock_monotonic_t;\n"
4098 "typealias integer {\n"
4099 " size = 64; align = %u; signed = false;\n"
4100 " map = clock.%s.value;\n"
4101 "} := uint64_clock_monotonic_t;\n\n",
4103 lttng_alignof(uint32_t) * CHAR_BIT
,
4105 lttng_alignof(uint64_t) * CHAR_BIT
,
4111 ret
= _lttng_stream_packet_context_declare(session
);
4115 ret
= _lttng_event_header_declare(session
);
4120 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
4121 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
4126 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
4127 ret
= _lttng_event_metadata_statedump(session
, event_recorder_priv
->pub
->chan
,
4128 event_recorder_priv
->pub
);
4132 session
->priv
->metadata_dumped
= 1;
4134 lttng_metadata_end(session
);
4139 * lttng_transport_register - LTT transport registration
4140 * @transport: transport structure
4142 * Registers a transport which can be used as output to extract the data out of
4143 * LTTng. The module calling this registration function must ensure that no
4144 * trap-inducing code will be executed by the transport functions. E.g.
4145 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4146 * is made visible to the transport function. This registration acts as a
4147 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4148 * after its registration must it synchronize the TLBs.
4150 void lttng_transport_register(struct lttng_transport
*transport
)
4153 * Make sure no page fault can be triggered by the module about to be
4154 * registered. We deal with this here so we don't have to call
4155 * vmalloc_sync_mappings() in each module's init.
4157 wrapper_vmalloc_sync_mappings();
4159 mutex_lock(&sessions_mutex
);
4160 list_add_tail(&transport
->node
, <tng_transport_list
);
4161 mutex_unlock(&sessions_mutex
);
4163 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4166 * lttng_transport_unregister - LTT transport unregistration
4167 * @transport: transport structure
4169 void lttng_transport_unregister(struct lttng_transport
*transport
)
4171 mutex_lock(&sessions_mutex
);
4172 list_del(&transport
->node
);
4173 mutex_unlock(&sessions_mutex
);
4175 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4177 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4180 * Make sure no page fault can be triggered by the module about to be
4181 * registered. We deal with this here so we don't have to call
4182 * vmalloc_sync_mappings() in each module's init.
4184 wrapper_vmalloc_sync_mappings();
4186 mutex_lock(&sessions_mutex
);
4187 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4188 mutex_unlock(&sessions_mutex
);
4190 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4192 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4194 mutex_lock(&sessions_mutex
);
4195 list_del(&transport
->node
);
4196 mutex_unlock(&sessions_mutex
);
4198 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4200 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4202 enum cpuhp_state lttng_hp_prepare
;
4203 enum cpuhp_state lttng_hp_online
;
4205 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4207 struct lttng_cpuhp_node
*lttng_node
;
4209 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4210 switch (lttng_node
->component
) {
4211 case LTTNG_RING_BUFFER_FRONTEND
:
4213 case LTTNG_RING_BUFFER_BACKEND
:
4214 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4215 case LTTNG_RING_BUFFER_ITER
:
4217 case LTTNG_CONTEXT_PERF_COUNTERS
:
4224 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4226 struct lttng_cpuhp_node
*lttng_node
;
4228 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4229 switch (lttng_node
->component
) {
4230 case LTTNG_RING_BUFFER_FRONTEND
:
4231 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4232 case LTTNG_RING_BUFFER_BACKEND
:
4234 case LTTNG_RING_BUFFER_ITER
:
4236 case LTTNG_CONTEXT_PERF_COUNTERS
:
4237 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4243 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4245 struct lttng_cpuhp_node
*lttng_node
;
4247 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4248 switch (lttng_node
->component
) {
4249 case LTTNG_RING_BUFFER_FRONTEND
:
4250 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4251 case LTTNG_RING_BUFFER_BACKEND
:
4253 case LTTNG_RING_BUFFER_ITER
:
4254 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4255 case LTTNG_CONTEXT_PERF_COUNTERS
:
4256 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4262 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4264 struct lttng_cpuhp_node
*lttng_node
;
4266 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4267 switch (lttng_node
->component
) {
4268 case LTTNG_RING_BUFFER_FRONTEND
:
4269 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4270 case LTTNG_RING_BUFFER_BACKEND
:
4272 case LTTNG_RING_BUFFER_ITER
:
4274 case LTTNG_CONTEXT_PERF_COUNTERS
:
4281 static int __init
lttng_init_cpu_hotplug(void)
4285 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4286 lttng_hotplug_prepare
,
4287 lttng_hotplug_dead
);
4291 lttng_hp_prepare
= ret
;
4292 lttng_rb_set_hp_prepare(ret
);
4294 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4295 lttng_hotplug_online
,
4296 lttng_hotplug_offline
);
4298 cpuhp_remove_multi_state(lttng_hp_prepare
);
4299 lttng_hp_prepare
= 0;
4302 lttng_hp_online
= ret
;
4303 lttng_rb_set_hp_online(ret
);
4308 static void __exit
lttng_exit_cpu_hotplug(void)
4310 lttng_rb_set_hp_online(0);
4311 cpuhp_remove_multi_state(lttng_hp_online
);
4312 lttng_rb_set_hp_prepare(0);
4313 cpuhp_remove_multi_state(lttng_hp_prepare
);
4316 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4317 static int lttng_init_cpu_hotplug(void)
4321 static void lttng_exit_cpu_hotplug(void)
4324 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4326 static int __init
lttng_events_init(void)
4330 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4333 ret
= wrapper_get_pfnblock_flags_mask_init();
4336 ret
= wrapper_get_pageblock_flags_mask_init();
4339 ret
= lttng_probes_init();
4342 ret
= lttng_context_init();
4345 ret
= lttng_tracepoint_init();
4348 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4349 if (!event_recorder_cache
) {
4351 goto error_kmem_event_recorder
;
4353 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4354 if (!event_recorder_private_cache
) {
4356 goto error_kmem_event_recorder_private
;
4358 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4359 if (!event_notifier_cache
) {
4361 goto error_kmem_event_notifier
;
4363 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4364 if (!event_notifier_private_cache
) {
4366 goto error_kmem_event_notifier_private
;
4368 ret
= lttng_abi_init();
4371 ret
= lttng_logger_init();
4374 ret
= lttng_init_cpu_hotplug();
4377 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4378 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4379 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4380 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4381 LTTNG_MODULES_EXTRAVERSION
,
4383 #ifdef LTTNG_EXTRA_VERSION_GIT
4384 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4388 #ifdef LTTNG_EXTRA_VERSION_NAME
4389 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4393 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4394 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4395 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4399 lttng_logger_exit();
4403 kmem_cache_destroy(event_notifier_private_cache
);
4404 error_kmem_event_notifier_private
:
4405 kmem_cache_destroy(event_notifier_cache
);
4406 error_kmem_event_notifier
:
4407 kmem_cache_destroy(event_recorder_private_cache
);
4408 error_kmem_event_recorder_private
:
4409 kmem_cache_destroy(event_recorder_cache
);
4410 error_kmem_event_recorder
:
4411 lttng_tracepoint_exit();
4413 lttng_context_exit();
4414 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4415 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4416 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4417 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4418 LTTNG_MODULES_EXTRAVERSION
,
4420 #ifdef LTTNG_EXTRA_VERSION_GIT
4421 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4425 #ifdef LTTNG_EXTRA_VERSION_NAME
4426 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4433 module_init(lttng_events_init
);
4435 static void __exit
lttng_events_exit(void)
4437 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4439 lttng_exit_cpu_hotplug();
4440 lttng_logger_exit();
4442 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4443 lttng_session_destroy(session_priv
->pub
);
4444 kmem_cache_destroy(event_recorder_cache
);
4445 kmem_cache_destroy(event_recorder_private_cache
);
4446 kmem_cache_destroy(event_notifier_cache
);
4447 kmem_cache_destroy(event_notifier_private_cache
);
4448 lttng_tracepoint_exit();
4449 lttng_context_exit();
4450 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4451 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4452 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4453 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4454 LTTNG_MODULES_EXTRAVERSION
,
4456 #ifdef LTTNG_EXTRA_VERSION_GIT
4457 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4461 #ifdef LTTNG_EXTRA_VERSION_NAME
4462 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4468 module_exit(lttng_events_exit
);
4470 #include <generated/patches.h>
4471 #ifdef LTTNG_EXTRA_VERSION_GIT
4472 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4474 #ifdef LTTNG_EXTRA_VERSION_NAME
4475 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4477 MODULE_LICENSE("GPL and additional rights");
4478 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4479 MODULE_DESCRIPTION("LTTng tracer");
4480 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4481 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4482 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4483 LTTNG_MODULES_EXTRAVERSION
);