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 <linux/uaccess.h>
27 #include <linux/vmalloc.h>
28 #include <linux/dmi.h>
30 #include <wrapper/compiler_attributes.h>
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/events-internal.h>
40 #include <lttng/lttng-bytecode.h>
41 #include <lttng/tracer.h>
42 #include <lttng/event-notifier-notification.h>
43 #include <lttng/abi-old.h>
44 #include <lttng/endian.h>
45 #include <lttng/string-utils.h>
46 #include <lttng/utils.h>
47 #include <ringbuffer/backend.h>
48 #include <ringbuffer/frontend.h>
50 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0) \
51 || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0))
52 #include <linux/stdarg.h>
57 #define METADATA_CACHE_DEFAULT_SIZE 4096
59 static LIST_HEAD(sessions
);
60 static LIST_HEAD(event_notifier_groups
);
61 static LIST_HEAD(lttng_transport_list
);
62 static LIST_HEAD(lttng_counter_transport_list
);
64 * Protect the sessions and metadata caches.
66 static DEFINE_MUTEX(sessions_mutex
);
67 static struct kmem_cache
*event_recorder_cache
;
68 static struct kmem_cache
*event_recorder_private_cache
;
69 static struct kmem_cache
*event_notifier_cache
;
70 static struct kmem_cache
*event_notifier_private_cache
;
72 static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
);
73 static void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
);
74 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
75 static void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
);
77 static void _lttng_event_destroy(struct lttng_kernel_event_common
*event
);
78 static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
);
79 static void _lttng_event_unregister(struct lttng_kernel_event_common
*event
);
81 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
);
83 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
);
85 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
87 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
88 const struct lttng_kernel_type_common
*type
,
89 enum lttng_kernel_string_encoding parent_encoding
,
92 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
93 const struct lttng_kernel_event_field
*field
,
94 size_t nesting
, const char **prev_field_name_p
);
96 void synchronize_trace(void)
98 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \
99 LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0))
105 #ifdef CONFIG_PREEMPT_RT_FULL
110 void lttng_lock_sessions(void)
112 mutex_lock(&sessions_mutex
);
115 void lttng_unlock_sessions(void)
117 mutex_unlock(&sessions_mutex
);
120 static struct lttng_transport
*lttng_transport_find(const char *name
)
122 struct lttng_transport
*transport
;
124 list_for_each_entry(transport
, <tng_transport_list
, node
) {
125 if (!strcmp(transport
->name
, name
))
132 * Called with sessions lock held.
134 int lttng_session_active(void)
136 struct lttng_kernel_session_private
*iter
;
138 list_for_each_entry(iter
, &sessions
, list
) {
139 if (iter
->pub
->active
)
145 struct lttng_kernel_session
*lttng_session_create(void)
147 struct lttng_kernel_session
*session
;
148 struct lttng_kernel_session_private
*session_priv
;
149 struct lttng_metadata_cache
*metadata_cache
;
152 mutex_lock(&sessions_mutex
);
153 session
= lttng_kvzalloc(sizeof(*session
), GFP_KERNEL
);
156 session_priv
= lttng_kvzalloc(sizeof(*session_priv
), GFP_KERNEL
);
158 goto err_free_session
;
159 session
->priv
= session_priv
;
160 session_priv
->pub
= session
;
162 INIT_LIST_HEAD(&session_priv
->chan
);
163 INIT_LIST_HEAD(&session_priv
->events
);
164 lttng_guid_gen(&session_priv
->uuid
);
166 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
169 goto err_free_session_private
;
170 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
171 if (!metadata_cache
->data
)
173 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
174 kref_init(&metadata_cache
->refcount
);
175 mutex_init(&metadata_cache
->lock
);
176 session_priv
->metadata_cache
= metadata_cache
;
177 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
178 memcpy(&metadata_cache
->uuid
, &session_priv
->uuid
,
179 sizeof(metadata_cache
->uuid
));
180 INIT_LIST_HEAD(&session_priv
->enablers_head
);
181 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
182 INIT_HLIST_HEAD(&session_priv
->events_ht
.table
[i
]);
183 list_add(&session_priv
->list
, &sessions
);
185 if (lttng_id_tracker_init(&session
->pid_tracker
, session
, TRACKER_PID
))
186 goto tracker_alloc_error
;
187 if (lttng_id_tracker_init(&session
->vpid_tracker
, session
, TRACKER_VPID
))
188 goto tracker_alloc_error
;
189 if (lttng_id_tracker_init(&session
->uid_tracker
, session
, TRACKER_UID
))
190 goto tracker_alloc_error
;
191 if (lttng_id_tracker_init(&session
->vuid_tracker
, session
, TRACKER_VUID
))
192 goto tracker_alloc_error
;
193 if (lttng_id_tracker_init(&session
->gid_tracker
, session
, TRACKER_GID
))
194 goto tracker_alloc_error
;
195 if (lttng_id_tracker_init(&session
->vgid_tracker
, session
, TRACKER_VGID
))
196 goto tracker_alloc_error
;
198 mutex_unlock(&sessions_mutex
);
203 lttng_id_tracker_fini(&session
->pid_tracker
);
204 lttng_id_tracker_fini(&session
->vpid_tracker
);
205 lttng_id_tracker_fini(&session
->uid_tracker
);
206 lttng_id_tracker_fini(&session
->vuid_tracker
);
207 lttng_id_tracker_fini(&session
->gid_tracker
);
208 lttng_id_tracker_fini(&session
->vgid_tracker
);
210 kfree(metadata_cache
);
211 err_free_session_private
:
212 lttng_kvfree(session_priv
);
214 lttng_kvfree(session
);
216 mutex_unlock(&sessions_mutex
);
221 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
223 struct lttng_counter_transport
*transport
;
225 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
226 if (!strcmp(transport
->name
, name
))
232 struct lttng_counter
*lttng_kernel_counter_create(
233 const char *counter_transport_name
,
234 size_t number_dimensions
, const size_t *dimensions_sizes
)
236 struct lttng_counter
*counter
= NULL
;
237 struct lttng_counter_transport
*counter_transport
= NULL
;
239 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
240 if (!counter_transport
) {
241 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
242 counter_transport_name
);
245 if (!try_module_get(counter_transport
->owner
)) {
246 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
250 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
254 /* Create event notifier error counter. */
255 counter
->ops
= &counter_transport
->ops
;
256 counter
->transport
= counter_transport
;
258 counter
->counter
= counter
->ops
->counter_create(
259 number_dimensions
, dimensions_sizes
, 0);
260 if (!counter
->counter
) {
267 lttng_kvfree(counter
);
269 if (counter_transport
)
270 module_put(counter_transport
->owner
);
275 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
277 struct lttng_transport
*transport
= NULL
;
278 struct lttng_event_notifier_group
*event_notifier_group
;
279 const char *transport_name
= "relay-event-notifier";
280 size_t subbuf_size
= 4096; //TODO
281 size_t num_subbuf
= 16; //TODO
282 unsigned int switch_timer_interval
= 0;
283 unsigned int read_timer_interval
= 0;
286 mutex_lock(&sessions_mutex
);
288 transport
= lttng_transport_find(transport_name
);
290 printk(KERN_WARNING
"LTTng: transport %s not found\n",
294 if (!try_module_get(transport
->owner
)) {
295 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
300 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
302 if (!event_notifier_group
)
306 * Initialize the ring buffer used to store event notifier
309 event_notifier_group
->ops
= &transport
->ops
;
310 event_notifier_group
->chan
= transport
->ops
.priv
->channel_create(
311 transport_name
, event_notifier_group
, NULL
,
312 subbuf_size
, num_subbuf
, switch_timer_interval
,
313 read_timer_interval
);
314 if (!event_notifier_group
->chan
)
317 event_notifier_group
->transport
= transport
;
319 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
320 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
321 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
322 INIT_HLIST_HEAD(&event_notifier_group
->events_ht
.table
[i
]);
324 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
326 mutex_unlock(&sessions_mutex
);
328 return event_notifier_group
;
331 lttng_kvfree(event_notifier_group
);
334 module_put(transport
->owner
);
336 mutex_unlock(&sessions_mutex
);
340 void metadata_cache_destroy(struct kref
*kref
)
342 struct lttng_metadata_cache
*cache
=
343 container_of(kref
, struct lttng_metadata_cache
, refcount
);
348 void lttng_session_destroy(struct lttng_kernel_session
*session
)
350 struct lttng_kernel_channel_buffer_private
*chan_priv
, *tmpchan_priv
;
351 struct lttng_kernel_event_recorder_private
*event_recorder_priv
, *tmpevent_recorder_priv
;
352 struct lttng_metadata_stream
*metadata_stream
;
353 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
356 mutex_lock(&sessions_mutex
);
357 WRITE_ONCE(session
->active
, 0);
358 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
359 ret
= lttng_syscalls_unregister_syscall_table(&chan_priv
->parent
.syscall_table
);
362 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
)
363 _lttng_event_unregister(&event_recorder_priv
->pub
->parent
);
364 synchronize_trace(); /* Wait for in-flight events to complete */
365 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
366 ret
= lttng_syscalls_destroy_syscall_table(&chan_priv
->parent
.syscall_table
);
369 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
, &session
->priv
->enablers_head
, node
)
370 lttng_event_enabler_destroy(event_enabler
);
371 list_for_each_entry_safe(event_recorder_priv
, tmpevent_recorder_priv
, &session
->priv
->events
, parent
.node
)
372 _lttng_event_destroy(&event_recorder_priv
->pub
->parent
);
373 list_for_each_entry_safe(chan_priv
, tmpchan_priv
, &session
->priv
->chan
, node
) {
374 BUG_ON(chan_priv
->channel_type
== METADATA_CHANNEL
);
375 _lttng_channel_destroy(chan_priv
->pub
);
377 mutex_lock(&session
->priv
->metadata_cache
->lock
);
378 list_for_each_entry(metadata_stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
379 _lttng_metadata_channel_hangup(metadata_stream
);
380 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
381 lttng_id_tracker_fini(&session
->pid_tracker
);
382 lttng_id_tracker_fini(&session
->vpid_tracker
);
383 lttng_id_tracker_fini(&session
->uid_tracker
);
384 lttng_id_tracker_fini(&session
->vuid_tracker
);
385 lttng_id_tracker_fini(&session
->gid_tracker
);
386 lttng_id_tracker_fini(&session
->vgid_tracker
);
387 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
388 list_del(&session
->priv
->list
);
389 mutex_unlock(&sessions_mutex
);
390 lttng_kvfree(session
->priv
);
391 lttng_kvfree(session
);
394 void lttng_event_notifier_group_destroy(
395 struct lttng_event_notifier_group
*event_notifier_group
)
397 struct lttng_event_enabler_common
*event_enabler
, *tmp_event_enabler
;
398 struct lttng_kernel_event_notifier_private
*event_notifier_priv
, *tmpevent_notifier_priv
;
401 if (!event_notifier_group
)
404 mutex_lock(&sessions_mutex
);
406 ret
= lttng_syscalls_unregister_syscall_table(&event_notifier_group
->syscall_table
);
409 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
410 &event_notifier_group
->event_notifiers_head
, parent
.node
)
411 _lttng_event_unregister(&event_notifier_priv
->pub
->parent
);
413 /* Wait for in-flight event notifier to complete */
416 irq_work_sync(&event_notifier_group
->wakeup_pending
);
418 ret
= lttng_syscalls_destroy_syscall_table(&event_notifier_group
->syscall_table
);
421 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
422 &event_notifier_group
->enablers_head
, node
)
423 lttng_event_enabler_destroy(event_enabler
);
425 list_for_each_entry_safe(event_notifier_priv
, tmpevent_notifier_priv
,
426 &event_notifier_group
->event_notifiers_head
, parent
.node
)
427 _lttng_event_destroy(&event_notifier_priv
->pub
->parent
);
429 if (event_notifier_group
->error_counter
) {
430 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
432 error_counter
->ops
->counter_destroy(error_counter
->counter
);
433 module_put(error_counter
->transport
->owner
);
434 lttng_kvfree(error_counter
);
435 event_notifier_group
->error_counter
= NULL
;
438 event_notifier_group
->ops
->priv
->channel_destroy(event_notifier_group
->chan
);
439 module_put(event_notifier_group
->transport
->owner
);
440 list_del(&event_notifier_group
->node
);
442 mutex_unlock(&sessions_mutex
);
443 lttng_kvfree(event_notifier_group
);
446 int lttng_session_statedump(struct lttng_kernel_session
*session
)
450 mutex_lock(&sessions_mutex
);
451 ret
= lttng_statedump_start(session
);
452 mutex_unlock(&sessions_mutex
);
456 int lttng_session_enable(struct lttng_kernel_session
*session
)
459 struct lttng_kernel_channel_buffer_private
*chan_priv
;
461 mutex_lock(&sessions_mutex
);
462 if (session
->active
) {
467 /* Set transient enabler state to "enabled" */
468 session
->priv
->tstate
= 1;
470 /* We need to sync enablers with session before activation. */
471 lttng_session_sync_event_enablers(session
);
474 * Snapshot the number of events per channel to know the type of header
477 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
478 if (chan_priv
->header_type
)
479 continue; /* don't change it if session stop/restart */
480 if (chan_priv
->free_event_id
< 31)
481 chan_priv
->header_type
= 1; /* compact */
483 chan_priv
->header_type
= 2; /* large */
486 /* Clear each stream's quiescent state. */
487 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
488 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
489 lib_ring_buffer_clear_quiescent_channel(chan_priv
->rb_chan
);
492 WRITE_ONCE(session
->active
, 1);
493 WRITE_ONCE(session
->priv
->been_active
, 1);
494 ret
= _lttng_session_metadata_statedump(session
);
496 WRITE_ONCE(session
->active
, 0);
499 ret
= lttng_statedump_start(session
);
501 WRITE_ONCE(session
->active
, 0);
503 mutex_unlock(&sessions_mutex
);
507 int lttng_session_disable(struct lttng_kernel_session
*session
)
510 struct lttng_kernel_channel_buffer_private
*chan_priv
;
512 mutex_lock(&sessions_mutex
);
513 if (!session
->active
) {
517 WRITE_ONCE(session
->active
, 0);
519 /* Set transient enabler state to "disabled" */
520 session
->priv
->tstate
= 0;
521 lttng_session_sync_event_enablers(session
);
523 /* Set each stream's quiescent state. */
524 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
525 if (chan_priv
->channel_type
!= METADATA_CHANNEL
)
526 lib_ring_buffer_set_quiescent_channel(chan_priv
->rb_chan
);
529 mutex_unlock(&sessions_mutex
);
533 int lttng_session_metadata_regenerate(struct lttng_kernel_session
*session
)
536 struct lttng_kernel_channel_buffer_private
*chan_priv
;
537 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
538 struct lttng_metadata_cache
*cache
= session
->priv
->metadata_cache
;
539 struct lttng_metadata_stream
*stream
;
541 mutex_lock(&sessions_mutex
);
542 if (!session
->active
) {
547 mutex_lock(&cache
->lock
);
548 memset(cache
->data
, 0, cache
->cache_alloc
);
549 cache
->metadata_written
= 0;
551 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
) {
552 stream
->metadata_out
= 0;
553 stream
->metadata_in
= 0;
555 mutex_unlock(&cache
->lock
);
557 session
->priv
->metadata_dumped
= 0;
558 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
559 chan_priv
->metadata_dumped
= 0;
562 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
563 event_recorder_priv
->metadata_dumped
= 0;
566 ret
= _lttng_session_metadata_statedump(session
);
569 mutex_unlock(&sessions_mutex
);
574 bool is_channel_buffer_metadata(struct lttng_kernel_channel_common
*channel
)
576 struct lttng_kernel_channel_buffer
*chan_buf
;
578 if (channel
->type
!= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
)
580 chan_buf
= container_of(channel
, struct lttng_kernel_channel_buffer
, parent
);
581 if (chan_buf
->priv
->channel_type
== METADATA_CHANNEL
)
586 int lttng_channel_enable(struct lttng_kernel_channel_common
*channel
)
590 mutex_lock(&sessions_mutex
);
591 if (is_channel_buffer_metadata(channel
)) {
595 if (channel
->enabled
) {
599 /* Set transient enabler state to "enabled" */
600 channel
->priv
->tstate
= 1;
601 lttng_session_sync_event_enablers(channel
->session
);
602 /* Set atomically the state to "enabled" */
603 WRITE_ONCE(channel
->enabled
, 1);
605 mutex_unlock(&sessions_mutex
);
609 int lttng_channel_disable(struct lttng_kernel_channel_common
*channel
)
613 mutex_lock(&sessions_mutex
);
614 if (is_channel_buffer_metadata(channel
)) {
618 if (!channel
->enabled
) {
622 /* Set atomically the state to "disabled" */
623 WRITE_ONCE(channel
->enabled
, 0);
624 /* Set transient enabler state to "enabled" */
625 channel
->priv
->tstate
= 0;
626 lttng_session_sync_event_enablers(channel
->session
);
628 mutex_unlock(&sessions_mutex
);
632 int lttng_event_enable(struct lttng_kernel_event_common
*event
)
636 mutex_lock(&sessions_mutex
);
637 switch (event
->type
) {
638 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
640 struct lttng_kernel_event_recorder
*event_recorder
=
641 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
643 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
649 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
650 switch (event
->priv
->instrumentation
) {
651 case LTTNG_KERNEL_ABI_KRETPROBE
:
662 if (event
->enabled
) {
666 switch (event
->priv
->instrumentation
) {
667 case LTTNG_KERNEL_ABI_TRACEPOINT
:
669 case LTTNG_KERNEL_ABI_SYSCALL
:
673 case LTTNG_KERNEL_ABI_KPROBE
:
675 case LTTNG_KERNEL_ABI_UPROBE
:
676 WRITE_ONCE(event
->enabled
, 1);
679 case LTTNG_KERNEL_ABI_KRETPROBE
:
680 ret
= lttng_kretprobes_event_enable_state(event
, 1);
683 case LTTNG_KERNEL_ABI_FUNCTION
:
685 case LTTNG_KERNEL_ABI_NOOP
:
692 mutex_unlock(&sessions_mutex
);
696 int lttng_event_disable(struct lttng_kernel_event_common
*event
)
700 mutex_lock(&sessions_mutex
);
701 switch (event
->type
) {
702 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
704 struct lttng_kernel_event_recorder
*event_recorder
=
705 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
707 if (event_recorder
->chan
->priv
->channel_type
== METADATA_CHANNEL
) {
713 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
714 switch (event
->priv
->instrumentation
) {
715 case LTTNG_KERNEL_ABI_KRETPROBE
:
726 if (!event
->enabled
) {
730 switch (event
->priv
->instrumentation
) {
731 case LTTNG_KERNEL_ABI_TRACEPOINT
:
733 case LTTNG_KERNEL_ABI_SYSCALL
:
737 case LTTNG_KERNEL_ABI_KPROBE
:
739 case LTTNG_KERNEL_ABI_UPROBE
:
740 WRITE_ONCE(event
->enabled
, 0);
743 case LTTNG_KERNEL_ABI_KRETPROBE
:
744 ret
= lttng_kretprobes_event_enable_state(event
, 0);
747 case LTTNG_KERNEL_ABI_FUNCTION
:
749 case LTTNG_KERNEL_ABI_NOOP
:
756 mutex_unlock(&sessions_mutex
);
760 struct lttng_kernel_channel_buffer
*lttng_channel_buffer_create(struct lttng_kernel_session
*session
,
761 const char *transport_name
,
763 size_t subbuf_size
, size_t num_subbuf
,
764 unsigned int switch_timer_interval
,
765 unsigned int read_timer_interval
,
766 enum channel_type channel_type
)
768 struct lttng_kernel_channel_buffer
*chan
;
769 struct lttng_kernel_channel_buffer_private
*chan_priv
;
770 struct lttng_transport
*transport
= NULL
;
772 mutex_lock(&sessions_mutex
);
773 if (session
->priv
->been_active
&& channel_type
!= METADATA_CHANNEL
)
774 goto active
; /* Refuse to add channel to active session */
775 transport
= lttng_transport_find(transport_name
);
777 printk(KERN_WARNING
"LTTng: transport %s not found\n",
781 if (!try_module_get(transport
->owner
)) {
782 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
785 chan
= kzalloc(sizeof(struct lttng_kernel_channel_buffer
), GFP_KERNEL
);
788 chan_priv
= kzalloc(sizeof(struct lttng_kernel_channel_buffer_private
), GFP_KERNEL
);
791 chan
->priv
= chan_priv
;
792 chan_priv
->pub
= chan
;
793 chan
->parent
.type
= LTTNG_KERNEL_CHANNEL_TYPE_BUFFER
;
794 chan
->parent
.session
= session
;
795 chan
->priv
->id
= session
->priv
->free_chan_id
++;
796 chan
->ops
= &transport
->ops
;
798 * Note: the channel creation op already writes into the packet
799 * headers. Therefore the "chan" information used as input
800 * should be already accessible.
802 chan
->priv
->rb_chan
= transport
->ops
.priv
->channel_create(transport_name
,
803 chan
, buf_addr
, subbuf_size
, num_subbuf
,
804 switch_timer_interval
, read_timer_interval
);
805 if (!chan
->priv
->rb_chan
)
807 chan
->priv
->parent
.tstate
= 1;
808 chan
->parent
.enabled
= 1;
809 chan
->priv
->transport
= transport
;
810 chan
->priv
->channel_type
= channel_type
;
811 list_add(&chan
->priv
->node
, &session
->priv
->chan
);
812 mutex_unlock(&sessions_mutex
);
821 module_put(transport
->owner
);
824 mutex_unlock(&sessions_mutex
);
829 * Only used internally at session destruction for per-cpu channels, and
830 * when metadata channel is released.
831 * Needs to be called with sessions mutex held.
834 void _lttng_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
836 chan
->ops
->priv
->channel_destroy(chan
->priv
->rb_chan
);
837 module_put(chan
->priv
->transport
->owner
);
838 list_del(&chan
->priv
->node
);
839 lttng_kernel_destroy_context(chan
->priv
->ctx
);
844 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer
*chan
)
846 BUG_ON(chan
->priv
->channel_type
!= METADATA_CHANNEL
);
848 /* Protect the metadata cache with the sessions_mutex. */
849 mutex_lock(&sessions_mutex
);
850 _lttng_channel_destroy(chan
);
851 mutex_unlock(&sessions_mutex
);
853 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
856 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
858 stream
->finalized
= 1;
859 wake_up_interruptible(&stream
->read_wait
);
863 bool lttng_kernel_event_id_available(struct lttng_event_enabler_common
*event_enabler
)
865 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
866 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
868 switch (event_enabler
->enabler_type
) {
869 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
871 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
872 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
873 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
876 case LTTNG_KERNEL_ABI_TRACEPOINT
:
878 case LTTNG_KERNEL_ABI_KPROBE
:
880 case LTTNG_KERNEL_ABI_SYSCALL
:
882 case LTTNG_KERNEL_ABI_UPROBE
:
883 if (chan
->priv
->free_event_id
== -1U)
886 case LTTNG_KERNEL_ABI_KRETPROBE
:
887 /* kretprobes require 2 event IDs. */
888 if (chan
->priv
->free_event_id
>= -2U)
896 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
905 struct lttng_kernel_event_common
*lttng_kernel_event_alloc(struct lttng_event_enabler_common
*event_enabler
)
907 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
908 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
910 switch (event_enabler
->enabler_type
) {
911 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
913 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
914 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
915 struct lttng_kernel_event_recorder
*event_recorder
;
916 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
917 struct lttng_kernel_channel_buffer
*chan
= event_recorder_enabler
->chan
;
919 event_recorder
= kmem_cache_zalloc(event_recorder_cache
, GFP_KERNEL
);
922 event_recorder_priv
= kmem_cache_zalloc(event_recorder_private_cache
, GFP_KERNEL
);
923 if (!event_recorder_priv
) {
924 kmem_cache_free(event_recorder_private_cache
, event_recorder
);
927 event_recorder_priv
->pub
= event_recorder
;
928 event_recorder_priv
->parent
.pub
= &event_recorder
->parent
;
929 event_recorder
->priv
= event_recorder_priv
;
930 event_recorder
->parent
.priv
= &event_recorder_priv
->parent
;
932 event_recorder
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_RECORDER
;
933 event_recorder
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
934 event_recorder
->priv
->parent
.instrumentation
= itype
;
935 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.filter_bytecode_runtime_head
);
936 INIT_LIST_HEAD(&event_recorder
->priv
->parent
.enablers_ref_head
);
938 event_recorder
->chan
= chan
;
939 event_recorder
->priv
->id
= chan
->priv
->free_event_id
++;
940 return &event_recorder
->parent
;
942 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
944 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
945 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
946 struct lttng_kernel_event_notifier
*event_notifier
;
947 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
949 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
952 event_notifier_priv
= kmem_cache_zalloc(event_notifier_private_cache
, GFP_KERNEL
);
953 if (!event_notifier_priv
) {
954 kmem_cache_free(event_notifier_private_cache
, event_notifier
);
957 event_notifier_priv
->pub
= event_notifier
;
958 event_notifier_priv
->parent
.pub
= &event_notifier
->parent
;
959 event_notifier
->priv
= event_notifier_priv
;
960 event_notifier
->parent
.priv
= &event_notifier_priv
->parent
;
962 event_notifier
->parent
.type
= LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
;
963 event_notifier
->parent
.run_filter
= lttng_kernel_interpret_event_filter
;
964 event_notifier
->priv
->parent
.instrumentation
= itype
;
965 event_notifier
->priv
->parent
.user_token
= event_enabler
->user_token
;
966 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.filter_bytecode_runtime_head
);
967 INIT_LIST_HEAD(&event_notifier
->priv
->parent
.enablers_ref_head
);
969 event_notifier
->priv
->group
= event_notifier_enabler
->group
;
970 event_notifier
->priv
->error_counter_index
= event_notifier_enabler
->error_counter_index
;
971 event_notifier
->priv
->num_captures
= 0;
972 event_notifier
->notification_send
= lttng_event_notifier_notification_send
;
973 INIT_LIST_HEAD(&event_notifier
->priv
->capture_bytecode_runtime_head
);
974 return &event_notifier
->parent
;
982 void lttng_kernel_event_free(struct lttng_kernel_event_common
*event
)
984 switch (event
->type
) {
985 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
987 struct lttng_kernel_event_recorder
*event_recorder
=
988 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
990 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
991 kmem_cache_free(event_recorder_cache
, event_recorder
);
994 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
996 struct lttng_kernel_event_notifier
*event_notifier
=
997 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
999 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1000 kmem_cache_free(event_notifier_cache
, event_notifier
);
1009 int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common
*event
)
1011 switch (event
->type
) {
1012 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1014 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1016 struct lttng_kernel_event_notifier
*event_notifier
=
1017 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1018 struct lttng_counter
*error_counter
;
1019 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier
->priv
->group
;
1020 size_t dimension_index
[1];
1024 * Clear the error counter bucket. The sessiond keeps track of which
1025 * bucket is currently in use. We trust it. The session lock
1026 * synchronizes against concurrent creation of the error
1029 error_counter
= event_notifier_group
->error_counter
;
1033 * Check that the index is within the boundary of the counter.
1035 if (event_notifier
->priv
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1036 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1037 event_notifier_group
->error_counter_len
, event_notifier
->priv
->error_counter_index
);
1041 dimension_index
[0] = event_notifier
->priv
->error_counter_index
;
1042 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1044 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1045 event_notifier
->priv
->error_counter_index
);
1056 * Supports event creation while tracing session is active.
1057 * Needs to be called with sessions mutex held.
1059 struct lttng_kernel_event_common
*_lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1060 const struct lttng_kernel_event_desc
*event_desc
)
1062 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
1063 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
1064 struct lttng_kernel_abi_event
*event_param
= &event_enabler
->event_param
;
1065 enum lttng_kernel_abi_instrumentation itype
= event_param
->instrumentation
;
1066 struct lttng_kernel_event_common_private
*event_priv
;
1067 struct lttng_kernel_event_common
*event
;
1068 const char *event_name
;
1069 struct hlist_head
*head
;
1072 if (!lttng_kernel_event_id_available(event_enabler
)) {
1078 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1079 event_name
= event_desc
->event_name
;
1082 case LTTNG_KERNEL_ABI_KPROBE
:
1084 case LTTNG_KERNEL_ABI_UPROBE
:
1086 case LTTNG_KERNEL_ABI_KRETPROBE
:
1088 case LTTNG_KERNEL_ABI_SYSCALL
:
1089 event_name
= event_param
->name
;
1092 case LTTNG_KERNEL_ABI_FUNCTION
:
1094 case LTTNG_KERNEL_ABI_NOOP
:
1102 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, event_name
);
1103 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
1104 if (lttng_event_enabler_event_name_match_event(event_enabler
, event_name
, event_priv
->pub
)) {
1110 event
= lttng_kernel_event_alloc(event_enabler
);
1117 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1118 /* Event will be enabled by enabler sync. */
1120 event
->priv
->registered
= 0;
1121 event
->priv
->desc
= lttng_event_desc_get(event_name
);
1122 if (!event
->priv
->desc
) {
1124 goto register_error
;
1126 /* Populate lttng_event structure before event registration. */
1130 case LTTNG_KERNEL_ABI_KPROBE
:
1132 * Needs to be explicitly enabled after creation, since
1133 * we may want to apply filters.
1136 event
->priv
->registered
= 1;
1138 * Populate lttng_event structure before event
1142 ret
= lttng_kprobes_register_event(event_name
,
1143 event_param
->u
.kprobe
.symbol_name
,
1144 event_param
->u
.kprobe
.offset
,
1145 event_param
->u
.kprobe
.addr
,
1149 goto register_error
;
1151 ret
= try_module_get(event
->priv
->desc
->owner
);
1155 case LTTNG_KERNEL_ABI_KRETPROBE
:
1157 struct lttng_kernel_event_common
*event_return
;
1159 /* kretprobe defines 2 events */
1161 * Needs to be explicitly enabled after creation, since
1162 * we may want to apply filters.
1165 event
->priv
->registered
= 1;
1167 event_return
= lttng_kernel_event_alloc(event_enabler
);
1173 event_return
->enabled
= 0;
1174 event_return
->priv
->registered
= 1;
1177 * Populate lttng_event structure before kretprobe registration.
1180 ret
= lttng_kretprobes_register(event_name
,
1181 event_param
->u
.kretprobe
.symbol_name
,
1182 event_param
->u
.kretprobe
.offset
,
1183 event_param
->u
.kretprobe
.addr
,
1184 event
, event_return
);
1186 lttng_kernel_event_free(event_return
);
1188 goto register_error
;
1190 /* Take 2 refs on the module: one per event. */
1191 ret
= try_module_get(event
->priv
->desc
->owner
);
1193 ret
= try_module_get(event_return
->priv
->desc
->owner
);
1195 ret
= _lttng_event_recorder_metadata_statedump(event_return
);
1196 WARN_ON_ONCE(ret
> 0);
1198 lttng_kernel_event_free(event_return
);
1199 module_put(event_return
->priv
->desc
->owner
);
1200 module_put(event
->priv
->desc
->owner
);
1201 goto statedump_error
;
1203 list_add(&event_return
->priv
->node
, event_list_head
);
1207 case LTTNG_KERNEL_ABI_SYSCALL
:
1209 * Needs to be explicitly enabled after creation, since
1210 * we may want to apply filters.
1213 event
->priv
->registered
= 0;
1214 event
->priv
->desc
= event_desc
;
1215 switch (event_param
->u
.syscall
.entryexit
) {
1216 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1218 goto register_error
;
1219 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1220 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1222 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1223 event
->priv
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1226 switch (event_param
->u
.syscall
.abi
) {
1227 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1229 goto register_error
;
1230 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1231 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1233 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1234 event
->priv
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1237 if (!event
->priv
->desc
) {
1239 goto register_error
;
1243 case LTTNG_KERNEL_ABI_UPROBE
:
1245 * Needs to be explicitly enabled after creation, since
1246 * we may want to apply filters.
1249 event
->priv
->registered
= 1;
1252 * Populate lttng_event structure before event
1257 ret
= lttng_uprobes_register_event(event_param
->name
,
1258 event_param
->u
.uprobe
.fd
,
1261 goto register_error
;
1262 ret
= try_module_get(event
->priv
->desc
->owner
);
1269 goto register_error
;
1272 ret
= _lttng_event_recorder_metadata_statedump(event
);
1273 WARN_ON_ONCE(ret
> 0);
1275 goto statedump_error
;
1278 ret
= lttng_kernel_event_notifier_clear_error_counter(event
);
1280 goto register_error
;
1282 hlist_add_head(&event
->priv
->hlist_node
, head
);
1283 list_add(&event
->priv
->node
, event_list_head
);
1288 /* If a statedump error occurs, events will not be readable. */
1290 lttng_kernel_event_free(event
);
1295 return ERR_PTR(ret
);
1298 struct lttng_kernel_event_common
*lttng_kernel_event_create(struct lttng_event_enabler_common
*event_enabler
,
1299 const struct lttng_kernel_event_desc
*event_desc
)
1301 struct lttng_kernel_event_common
*event
;
1303 mutex_lock(&sessions_mutex
);
1304 event
= _lttng_kernel_event_create(event_enabler
, event_desc
);
1305 mutex_unlock(&sessions_mutex
);
1309 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1310 const size_t *dim_indexes
, int32_t cpu
,
1311 int64_t *val
, bool *overflow
, bool *underflow
)
1313 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1314 cpu
, val
, overflow
, underflow
);
1317 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1318 const size_t *dim_indexes
, int64_t *val
,
1319 bool *overflow
, bool *underflow
)
1321 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1322 val
, overflow
, underflow
);
1325 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1326 const size_t *dim_indexes
)
1328 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1331 /* Only used for tracepoints and system calls for now. */
1333 void register_event(struct lttng_kernel_event_common
*event
)
1335 const struct lttng_kernel_event_desc
*desc
;
1338 WARN_ON_ONCE(event
->priv
->registered
);
1340 desc
= event
->priv
->desc
;
1341 switch (event
->priv
->instrumentation
) {
1342 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1343 ret
= lttng_tracepoint_probe_register(desc
->event_kname
,
1344 desc
->tp_class
->probe_callback
,
1348 case LTTNG_KERNEL_ABI_SYSCALL
:
1349 ret
= lttng_syscall_filter_enable_event(event
);
1352 case LTTNG_KERNEL_ABI_KPROBE
:
1354 case LTTNG_KERNEL_ABI_UPROBE
:
1358 case LTTNG_KERNEL_ABI_KRETPROBE
:
1359 switch (event
->type
) {
1360 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1363 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1369 case LTTNG_KERNEL_ABI_FUNCTION
:
1371 case LTTNG_KERNEL_ABI_NOOP
:
1378 event
->priv
->registered
= 1;
1382 void unregister_event(struct lttng_kernel_event_common
*event
)
1384 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1385 const struct lttng_kernel_event_desc
*desc
;
1388 WARN_ON_ONCE(!event
->priv
->registered
);
1390 desc
= event_priv
->desc
;
1391 switch (event_priv
->instrumentation
) {
1392 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1393 ret
= lttng_tracepoint_probe_unregister(event_priv
->desc
->event_kname
,
1394 event_priv
->desc
->tp_class
->probe_callback
,
1398 case LTTNG_KERNEL_ABI_KPROBE
:
1399 lttng_kprobes_unregister_event(event
);
1403 case LTTNG_KERNEL_ABI_KRETPROBE
:
1404 switch (event
->type
) {
1405 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1406 lttng_kretprobes_unregister(event
);
1409 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1415 case LTTNG_KERNEL_ABI_SYSCALL
:
1416 ret
= lttng_syscall_filter_disable_event(event
);
1419 case LTTNG_KERNEL_ABI_NOOP
:
1420 switch (event
->type
) {
1421 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1424 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1430 case LTTNG_KERNEL_ABI_UPROBE
:
1431 lttng_uprobes_unregister_event(event
);
1435 case LTTNG_KERNEL_ABI_FUNCTION
:
1442 event_priv
->registered
= 0;
1446 void _lttng_event_unregister(struct lttng_kernel_event_common
*event
)
1448 if (event
->priv
->registered
)
1449 unregister_event(event
);
1453 * Only used internally at session destruction.
1456 void _lttng_event_destroy(struct lttng_kernel_event_common
*event
)
1458 struct lttng_kernel_event_common_private
*event_priv
= event
->priv
;
1459 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1461 lttng_free_event_filter_runtime(event
);
1462 /* Free event enabler refs */
1463 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1464 &event_priv
->enablers_ref_head
, node
)
1467 switch (event
->type
) {
1468 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1470 struct lttng_kernel_event_recorder
*event_recorder
=
1471 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1473 switch (event_priv
->instrumentation
) {
1474 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1475 lttng_event_desc_put(event_priv
->desc
);
1478 case LTTNG_KERNEL_ABI_KPROBE
:
1479 module_put(event_priv
->desc
->owner
);
1480 lttng_kprobes_destroy_event_private(&event_recorder
->parent
);
1483 case LTTNG_KERNEL_ABI_KRETPROBE
:
1484 module_put(event_priv
->desc
->owner
);
1485 lttng_kretprobes_destroy_private(&event_recorder
->parent
);
1488 case LTTNG_KERNEL_ABI_SYSCALL
:
1491 case LTTNG_KERNEL_ABI_UPROBE
:
1492 module_put(event_priv
->desc
->owner
);
1493 lttng_uprobes_destroy_event_private(&event_recorder
->parent
);
1496 case LTTNG_KERNEL_ABI_FUNCTION
:
1498 case LTTNG_KERNEL_ABI_NOOP
:
1503 list_del(&event_recorder
->priv
->parent
.node
);
1504 kmem_cache_free(event_recorder_private_cache
, event_recorder
->priv
);
1505 kmem_cache_free(event_recorder_cache
, event_recorder
);
1508 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1510 struct lttng_kernel_event_notifier
*event_notifier
=
1511 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1513 switch (event_notifier
->priv
->parent
.instrumentation
) {
1514 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1515 lttng_event_desc_put(event_notifier
->priv
->parent
.desc
);
1518 case LTTNG_KERNEL_ABI_KPROBE
:
1519 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1520 lttng_kprobes_destroy_event_private(&event_notifier
->parent
);
1523 case LTTNG_KERNEL_ABI_SYSCALL
:
1526 case LTTNG_KERNEL_ABI_UPROBE
:
1527 module_put(event_notifier
->priv
->parent
.desc
->owner
);
1528 lttng_uprobes_destroy_event_private(&event_notifier
->parent
);
1531 case LTTNG_KERNEL_ABI_KRETPROBE
:
1533 case LTTNG_KERNEL_ABI_FUNCTION
:
1535 case LTTNG_KERNEL_ABI_NOOP
:
1540 list_del(&event_notifier
->priv
->parent
.node
);
1541 kmem_cache_free(event_notifier_private_cache
, event_notifier
->priv
);
1542 kmem_cache_free(event_notifier_cache
, event_notifier
);
1551 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1552 enum tracker_type tracker_type
)
1554 switch (tracker_type
) {
1556 return &session
->pid_tracker
;
1558 return &session
->vpid_tracker
;
1560 return &session
->uid_tracker
;
1562 return &session
->vuid_tracker
;
1564 return &session
->gid_tracker
;
1566 return &session
->vgid_tracker
;
1573 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1574 enum tracker_type tracker_type
, int id
)
1576 struct lttng_kernel_id_tracker
*tracker
;
1579 tracker
= get_tracker(session
, tracker_type
);
1584 mutex_lock(&sessions_mutex
);
1586 /* track all ids: destroy tracker. */
1587 lttng_id_tracker_destroy(tracker
, true);
1590 ret
= lttng_id_tracker_add(tracker
, id
);
1592 mutex_unlock(&sessions_mutex
);
1596 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1597 enum tracker_type tracker_type
, int id
)
1599 struct lttng_kernel_id_tracker
*tracker
;
1602 tracker
= get_tracker(session
, tracker_type
);
1607 mutex_lock(&sessions_mutex
);
1609 /* untrack all ids: replace by empty tracker. */
1610 ret
= lttng_id_tracker_empty_set(tracker
);
1612 ret
= lttng_id_tracker_del(tracker
, id
);
1614 mutex_unlock(&sessions_mutex
);
1619 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1621 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1622 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1623 struct lttng_id_hash_node
*e
;
1626 mutex_lock(&sessions_mutex
);
1628 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1629 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1631 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1637 /* ID tracker disabled. */
1638 if (iter
>= *pos
&& iter
== 0) {
1639 return id_tracker_p
; /* empty tracker */
1647 /* Called with sessions_mutex held. */
1649 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1651 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1652 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1653 struct lttng_id_hash_node
*e
;
1658 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1659 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1661 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1662 if (iter
++ >= *ppos
)
1667 /* ID tracker disabled. */
1668 if (iter
>= *ppos
&& iter
== 0)
1669 return p
; /* empty tracker */
1678 void id_list_stop(struct seq_file
*m
, void *p
)
1680 mutex_unlock(&sessions_mutex
);
1684 int id_list_show(struct seq_file
*m
, void *p
)
1686 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1687 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1690 if (p
== id_tracker_p
) {
1691 /* Tracker disabled. */
1694 const struct lttng_id_hash_node
*e
= p
;
1696 id
= lttng_id_tracker_get_node_id(e
);
1698 switch (id_tracker
->priv
->tracker_type
) {
1700 seq_printf(m
, "process { pid = %d; };\n", id
);
1703 seq_printf(m
, "process { vpid = %d; };\n", id
);
1706 seq_printf(m
, "user { uid = %d; };\n", id
);
1709 seq_printf(m
, "user { vuid = %d; };\n", id
);
1712 seq_printf(m
, "group { gid = %d; };\n", id
);
1715 seq_printf(m
, "group { vgid = %d; };\n", id
);
1718 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1724 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1725 .start
= id_list_start
,
1726 .next
= id_list_next
,
1727 .stop
= id_list_stop
,
1728 .show
= id_list_show
,
1732 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1734 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1738 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1740 struct seq_file
*m
= file
->private_data
;
1741 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1744 WARN_ON_ONCE(!id_tracker
);
1745 ret
= seq_release(inode
, file
);
1747 fput(id_tracker
->priv
->session
->priv
->file
);
1751 const struct file_operations lttng_tracker_ids_list_fops
= {
1752 .owner
= THIS_MODULE
,
1753 .open
= lttng_tracker_ids_list_open
,
1755 .llseek
= seq_lseek
,
1756 .release
= lttng_tracker_ids_list_release
,
1759 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1760 enum tracker_type tracker_type
)
1762 struct file
*tracker_ids_list_file
;
1766 file_fd
= get_unused_fd_flags(0);
1772 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1773 <tng_tracker_ids_list_fops
,
1775 if (IS_ERR(tracker_ids_list_file
)) {
1776 ret
= PTR_ERR(tracker_ids_list_file
);
1779 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1781 goto refcount_error
;
1783 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1786 m
= tracker_ids_list_file
->private_data
;
1788 m
->private = get_tracker(session
, tracker_type
);
1789 BUG_ON(!m
->private);
1790 fd_install(file_fd
, tracker_ids_list_file
);
1795 atomic_long_dec(&session
->priv
->file
->f_count
);
1797 fput(tracker_ids_list_file
);
1799 put_unused_fd(file_fd
);
1805 * Enabler management.
1808 int lttng_match_enabler_star_glob(const char *desc_name
,
1809 const char *pattern
)
1811 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1812 desc_name
, LTTNG_SIZE_MAX
))
1818 int lttng_match_enabler_name(const char *desc_name
,
1821 if (strcmp(desc_name
, name
))
1827 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1828 struct lttng_event_enabler_common
*enabler
)
1830 const char *desc_name
, *enabler_name
;
1831 bool compat
= false, entry
= false;
1833 enabler_name
= enabler
->event_param
.name
;
1834 switch (enabler
->event_param
.instrumentation
) {
1835 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1836 desc_name
= desc
->event_name
;
1837 switch (enabler
->format_type
) {
1838 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1839 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1840 case LTTNG_ENABLER_FORMAT_NAME
:
1841 return lttng_match_enabler_name(desc_name
, enabler_name
);
1847 case LTTNG_KERNEL_ABI_SYSCALL
:
1848 desc_name
= desc
->event_name
;
1849 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1850 desc_name
+= strlen("compat_");
1853 if (!strncmp(desc_name
, "syscall_exit_",
1854 strlen("syscall_exit_"))) {
1855 desc_name
+= strlen("syscall_exit_");
1856 } else if (!strncmp(desc_name
, "syscall_entry_",
1857 strlen("syscall_entry_"))) {
1858 desc_name
+= strlen("syscall_entry_");
1864 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1865 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1867 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1871 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1878 switch (enabler
->event_param
.u
.syscall
.abi
) {
1879 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1881 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1885 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1892 switch (enabler
->event_param
.u
.syscall
.match
) {
1893 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1894 switch (enabler
->format_type
) {
1895 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1896 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1897 case LTTNG_ENABLER_FORMAT_NAME
:
1898 return lttng_match_enabler_name(desc_name
, enabler_name
);
1903 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1904 return -EINVAL
; /* Not implemented. */
1916 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1917 struct lttng_event_enabler_common
*enabler
)
1921 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
1929 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
1930 struct lttng_kernel_event_common
*event
)
1932 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1935 switch (event_enabler
->enabler_type
) {
1936 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1938 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1939 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1940 struct lttng_kernel_event_recorder
*event_recorder
=
1941 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1943 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1944 && event_recorder
->chan
== event_recorder_enabler
->chan
)
1949 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1951 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1952 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1953 struct lttng_kernel_event_notifier
*event_notifier
=
1954 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1956 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1957 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1958 && event
->priv
->user_token
== event_enabler
->user_token
)
1969 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
1970 const struct lttng_kernel_event_desc
*desc
,
1971 struct lttng_kernel_event_common
*event
)
1973 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1976 switch (event_enabler
->enabler_type
) {
1977 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1979 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1980 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1981 struct lttng_kernel_event_recorder
*event_recorder
=
1982 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1984 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
1989 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1991 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1992 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1993 struct lttng_kernel_event_notifier
*event_notifier
=
1994 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1996 if (event
->priv
->desc
== desc
1997 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1998 && event
->priv
->user_token
== event_enabler
->user_token
)
2009 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2010 const char *event_name
,
2011 struct lttng_kernel_event_common
*event
)
2013 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2016 switch (event_enabler
->enabler_type
) {
2017 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2019 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2020 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2021 struct lttng_kernel_event_recorder
*event_recorder
=
2022 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2024 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2025 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2030 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2032 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2033 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2034 struct lttng_kernel_event_notifier
*event_notifier
=
2035 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2037 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2038 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2039 && event
->priv
->user_token
== event_enabler
->user_token
)
2051 struct lttng_enabler_ref
*lttng_enabler_ref(
2052 struct list_head
*enablers_ref_list
,
2053 struct lttng_event_enabler_common
*enabler
)
2055 struct lttng_enabler_ref
*enabler_ref
;
2057 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2058 if (enabler_ref
->ref
== enabler
)
2065 void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2067 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2068 struct lttng_kernel_probe_desc
*probe_desc
;
2069 const struct lttng_kernel_event_desc
*desc
;
2070 struct list_head
*probe_list
;
2073 probe_list
= lttng_get_probe_list_head();
2075 * For each probe event, if we find that a probe event matches
2076 * our enabler, create an associated lttng_event if not
2079 list_for_each_entry(probe_desc
, probe_list
, head
) {
2080 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2082 struct hlist_head
*head
;
2083 struct lttng_kernel_event_common
*event
;
2084 struct lttng_kernel_event_common_private
*event_priv
;
2086 desc
= probe_desc
->event_desc
[i
];
2087 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2091 * Check if already created.
2093 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2094 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2095 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
)) {
2104 * We need to create an event for this event probe.
2106 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2107 if (IS_ERR(event
)) {
2108 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2109 probe_desc
->event_desc
[i
]->event_name
);
2116 * Create event if it is missing and present in the list of tracepoint probes.
2117 * Should be called with sessions mutex held.
2120 void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2124 switch (event_enabler
->event_param
.instrumentation
) {
2125 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2126 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler
);
2129 case LTTNG_KERNEL_ABI_SYSCALL
:
2130 ret
= lttng_event_enabler_create_syscall_events_if_missing(event_enabler
);
2141 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2142 struct lttng_kernel_event_common
*event
)
2144 /* Link filter bytecodes if not linked yet. */
2145 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2146 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2150 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2151 struct lttng_kernel_event_common
*event
)
2153 switch (event_enabler
->enabler_type
) {
2154 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2156 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2158 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2159 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2160 struct lttng_kernel_event_notifier
*event_notifier
=
2161 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2163 /* Link capture bytecodes if not linked yet. */
2164 lttng_enabler_link_bytecode(event
->priv
->desc
,
2165 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2166 &event_notifier_enabler
->capture_bytecode_head
);
2167 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2176 * Create events associated with an event_enabler (if not already present),
2177 * and add backward reference from the event to the enabler.
2178 * Should be called with sessions mutex held.
2181 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2183 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2184 struct lttng_kernel_event_common_private
*event_priv
;
2186 lttng_syscall_table_set_wildcard_all(event_enabler
);
2188 /* First ensure that probe events are created for this enabler. */
2189 lttng_event_enabler_create_events_if_missing(event_enabler
);
2191 /* Link the created event with its associated enabler. */
2192 list_for_each_entry(event_priv
, event_list_head
, node
) {
2193 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2194 struct lttng_enabler_ref
*enabler_ref
;
2196 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2199 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2202 * If no backward ref, create it.
2203 * Add backward ref from event_notifier to enabler.
2205 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2209 enabler_ref
->ref
= event_enabler
;
2210 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2213 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2214 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2220 * Called at module load: connect the probe on all enablers matching
2222 * Called with sessions lock held.
2224 int lttng_fix_pending_events(void)
2226 struct lttng_kernel_session_private
*session_priv
;
2228 list_for_each_entry(session_priv
, &sessions
, list
)
2229 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2233 static bool lttng_event_notifier_group_has_active_event_notifiers(
2234 struct lttng_event_notifier_group
*event_notifier_group
)
2236 struct lttng_event_enabler_common
*event_enabler
;
2238 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2239 if (event_enabler
->enabled
)
2245 bool lttng_event_notifier_active(void)
2247 struct lttng_event_notifier_group
*event_notifier_group
;
2249 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2250 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2256 int lttng_fix_pending_event_notifiers(void)
2258 struct lttng_event_notifier_group
*event_notifier_group
;
2260 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2261 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2265 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2266 enum lttng_enabler_format_type format_type
,
2267 struct lttng_kernel_abi_event
*event_param
,
2268 struct lttng_kernel_channel_buffer
*chan
)
2270 struct lttng_event_recorder_enabler
*event_enabler
;
2272 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2275 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2276 event_enabler
->parent
.format_type
= format_type
;
2277 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2278 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2279 sizeof(event_enabler
->parent
.event_param
));
2280 event_enabler
->chan
= chan
;
2282 event_enabler
->parent
.enabled
= 0;
2283 return event_enabler
;
2286 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2287 struct lttng_event_recorder_enabler
*event_enabler
)
2289 mutex_lock(&sessions_mutex
);
2290 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2291 event_enabler
->parent
.published
= true;
2292 lttng_session_lazy_sync_event_enablers(session
);
2293 mutex_unlock(&sessions_mutex
);
2296 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2298 mutex_lock(&sessions_mutex
);
2299 event_enabler
->enabled
= 1;
2300 lttng_event_enabler_sync(event_enabler
);
2301 mutex_unlock(&sessions_mutex
);
2305 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2307 mutex_lock(&sessions_mutex
);
2308 event_enabler
->enabled
= 0;
2309 lttng_event_enabler_sync(event_enabler
);
2310 mutex_unlock(&sessions_mutex
);
2315 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2316 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2318 struct lttng_kernel_bytecode_node
*bytecode_node
;
2319 uint32_t bytecode_len
;
2322 ret
= get_user(bytecode_len
, &bytecode
->len
);
2325 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2329 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2330 sizeof(*bytecode
) + bytecode_len
);
2334 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2335 bytecode_node
->enabler
= enabler
;
2336 /* Enforce length based on allocated size */
2337 bytecode_node
->bc
.len
= bytecode_len
;
2338 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2343 lttng_kvfree(bytecode_node
);
2347 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2348 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2351 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2354 lttng_event_enabler_sync(event_enabler
);
2361 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2362 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2365 switch (event
->priv
->instrumentation
) {
2366 case LTTNG_KERNEL_ABI_UPROBE
:
2367 return lttng_uprobes_event_add_callsite(event
, callsite
);
2374 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2376 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2378 /* Destroy filter bytecode */
2379 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2380 &enabler
->filter_bytecode_head
, node
) {
2381 lttng_kvfree(filter_node
);
2385 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2387 lttng_enabler_destroy(event_enabler
);
2388 if (event_enabler
->published
)
2389 list_del(&event_enabler
->node
);
2391 switch (event_enabler
->enabler_type
) {
2392 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2394 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2395 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2397 kfree(event_recorder_enabler
);
2400 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2402 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2403 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2405 kfree(event_notifier_enabler
);
2413 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2414 enum lttng_enabler_format_type format_type
,
2415 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2416 struct lttng_event_notifier_group
*event_notifier_group
)
2418 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2420 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2421 if (!event_notifier_enabler
)
2424 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2425 event_notifier_enabler
->parent
.format_type
= format_type
;
2426 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2427 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2429 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2430 event_notifier_enabler
->num_captures
= 0;
2432 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2433 sizeof(event_notifier_enabler
->parent
.event_param
));
2435 event_notifier_enabler
->parent
.enabled
= 0;
2436 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2437 event_notifier_enabler
->group
= event_notifier_group
;
2438 return event_notifier_enabler
;
2441 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2442 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2444 mutex_lock(&sessions_mutex
);
2445 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2446 event_notifier_enabler
->parent
.published
= true;
2447 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2448 mutex_unlock(&sessions_mutex
);
2451 int lttng_event_notifier_enabler_attach_capture_bytecode(
2452 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2453 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2455 struct lttng_kernel_bytecode_node
*bytecode_node
;
2456 struct lttng_event_enabler_common
*enabler
=
2457 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2458 uint32_t bytecode_len
;
2461 ret
= get_user(bytecode_len
, &bytecode
->len
);
2465 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2470 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2471 sizeof(*bytecode
) + bytecode_len
);
2475 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2476 bytecode_node
->enabler
= enabler
;
2478 /* Enforce length based on allocated size */
2479 bytecode_node
->bc
.len
= bytecode_len
;
2480 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2482 event_notifier_enabler
->num_captures
++;
2484 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2488 lttng_kvfree(bytecode_node
);
2494 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2496 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2497 struct lttng_kernel_bytecode_runtime
*runtime
;
2498 struct lttng_enabler_ref
*enabler_ref
;
2500 /* Check if has enablers without bytecode enabled */
2501 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2502 if (enabler_ref
->ref
->enabled
2503 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2504 has_enablers_without_filter_bytecode
= 1;
2508 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2510 /* Enable filters */
2511 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2512 lttng_bytecode_sync_state(runtime
);
2515 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2519 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2521 switch (event
->type
) {
2522 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2524 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2526 struct lttng_kernel_event_notifier
*event_notifier
=
2527 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2528 struct lttng_kernel_bytecode_runtime
*runtime
;
2529 int nr_captures
= 0;
2531 /* Enable captures */
2532 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2533 lttng_bytecode_sync_state(runtime
);
2536 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2545 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2547 struct lttng_enabler_ref
*enabler_ref
;
2548 bool enabled
= false;
2550 switch (event
->priv
->instrumentation
) {
2551 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2553 case LTTNG_KERNEL_ABI_SYSCALL
:
2555 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2556 if (enabler_ref
->ref
->enabled
) {
2567 switch (event
->type
) {
2568 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2570 struct lttng_kernel_event_recorder
*event_recorder
=
2571 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2574 * Enabled state is based on union of enablers, with
2575 * intersection of session and channel transient enable
2578 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2580 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2589 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2591 switch (event
->priv
->instrumentation
) {
2592 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2594 case LTTNG_KERNEL_ABI_SYSCALL
:
2598 /* Not handled with lazy sync. */
2604 * Should be called with sessions mutex held.
2607 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2608 struct list_head
*event_list
)
2610 struct lttng_kernel_event_common_private
*event_priv
;
2611 struct lttng_event_enabler_common
*event_enabler
;
2613 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2614 lttng_event_enabler_ref_events(event_enabler
);
2617 * For each event, if at least one of its enablers is enabled,
2618 * and its channel and session transient states are enabled, we
2619 * enable the event, else we disable it.
2621 list_for_each_entry(event_priv
, event_list
, node
) {
2622 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2625 if (!lttng_event_is_lazy_sync(event
))
2628 enabled
= lttng_get_event_enabled_state(event
);
2629 WRITE_ONCE(event
->enabled
, enabled
);
2631 * Sync tracepoint registration with event enabled state.
2634 if (!event_priv
->registered
)
2635 register_event(event
);
2637 if (event_priv
->registered
)
2638 unregister_event(event
);
2641 lttng_event_sync_filter_state(event
);
2642 lttng_event_sync_capture_state(event
);
2647 * lttng_session_sync_event_enablers should be called just before starting a
2651 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2653 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2657 * Apply enablers to session events, adding events to session if need
2658 * be. It is required after each modification applied to an active
2659 * session, and right before session "start".
2660 * "lazy" sync means we only sync if required.
2661 * Should be called with sessions mutex held.
2664 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2666 /* We can skip if session is not active */
2667 if (!session
->active
)
2669 lttng_session_sync_event_enablers(session
);
2673 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2675 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2679 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2681 switch (event_enabler
->enabler_type
) {
2682 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2684 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2685 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2686 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2689 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2691 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2692 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2693 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2702 * Serialize at most one packet worth of metadata into a metadata
2704 * We grab the metadata cache mutex to get exclusive access to our metadata
2705 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2706 * allows us to do racy operations such as looking for remaining space left in
2707 * packet and write, since mutual exclusion protects us from concurrent writes.
2708 * Mutual exclusion on the metadata cache allow us to read the cache content
2709 * without racing against reallocation of the cache by updates.
2710 * Returns the number of bytes written in the channel, 0 if no data
2711 * was written and a negative value on error.
2713 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2714 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2716 struct lttng_kernel_ring_buffer_ctx ctx
;
2718 size_t len
, reserve_len
;
2721 * Ensure we support mutiple get_next / put sequences followed by
2722 * put_next. The metadata cache lock protects reading the metadata
2723 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2724 * "flush" operations on the buffer invoked by different processes.
2725 * Moreover, since the metadata cache memory can be reallocated, we
2726 * need to have exclusive access against updates even though we only
2729 mutex_lock(&stream
->metadata_cache
->lock
);
2730 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2731 if (stream
->metadata_in
!= stream
->metadata_out
)
2734 /* Metadata regenerated, change the version. */
2735 if (stream
->metadata_cache
->version
!= stream
->version
)
2736 stream
->version
= stream
->metadata_cache
->version
;
2738 len
= stream
->metadata_cache
->metadata_written
-
2739 stream
->metadata_in
;
2742 reserve_len
= min_t(size_t,
2743 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2745 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2746 sizeof(char), NULL
);
2748 * If reservation failed, return an error to the caller.
2750 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2752 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2753 stream
->coherent
= false;
2756 stream
->transport
->ops
.event_write(&ctx
,
2757 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2759 stream
->transport
->ops
.event_commit(&ctx
);
2760 stream
->metadata_in
+= reserve_len
;
2761 if (reserve_len
< len
)
2762 stream
->coherent
= false;
2764 stream
->coherent
= true;
2769 *coherent
= stream
->coherent
;
2770 mutex_unlock(&stream
->metadata_cache
->lock
);
2775 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2777 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2778 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2782 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2784 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2785 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2786 struct lttng_metadata_stream
*stream
;
2788 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2789 wake_up_interruptible(&stream
->read_wait
);
2790 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2795 * Write the metadata to the metadata cache.
2796 * Must be called with sessions_mutex held.
2797 * The metadata cache lock protects us from concurrent read access from
2798 * thread outputting metadata content to ring buffer.
2799 * The content of the printf is printed as a single atomic metadata
2803 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2804 const char *fmt
, ...)
2810 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2813 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2819 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2820 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2821 session
->priv
->metadata_cache
->cache_alloc
) {
2822 char *tmp_cache_realloc
;
2823 unsigned int tmp_cache_alloc_size
;
2825 tmp_cache_alloc_size
= max_t(unsigned int,
2826 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2827 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2828 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2829 if (!tmp_cache_realloc
)
2831 if (session
->priv
->metadata_cache
->data
) {
2832 memcpy(tmp_cache_realloc
,
2833 session
->priv
->metadata_cache
->data
,
2834 session
->priv
->metadata_cache
->cache_alloc
);
2835 vfree(session
->priv
->metadata_cache
->data
);
2838 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2839 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2841 memcpy(session
->priv
->metadata_cache
->data
+
2842 session
->priv
->metadata_cache
->metadata_written
,
2844 session
->priv
->metadata_cache
->metadata_written
+= len
;
2855 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2859 for (i
= 0; i
< nesting
; i
++) {
2862 ret
= lttng_metadata_printf(session
, " ");
2871 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2872 const struct lttng_kernel_event_field
*field
,
2875 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2879 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2880 const struct lttng_kernel_type_integer
*type
,
2881 enum lttng_kernel_string_encoding parent_encoding
,
2886 ret
= print_tabs(session
, nesting
);
2889 ret
= lttng_metadata_printf(session
,
2890 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2894 (parent_encoding
== lttng_kernel_string_encoding_none
)
2896 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
2900 #if __BYTE_ORDER == __BIG_ENDIAN
2901 type
->reverse_byte_order
? " byte_order = le;" : ""
2903 type
->reverse_byte_order
? " byte_order = be;" : ""
2910 * Must be called with sessions_mutex held.
2913 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
2914 const struct lttng_kernel_type_struct
*type
,
2917 const char *prev_field_name
= NULL
;
2919 uint32_t i
, nr_fields
;
2920 unsigned int alignment
;
2922 ret
= print_tabs(session
, nesting
);
2925 ret
= lttng_metadata_printf(session
,
2929 nr_fields
= type
->nr_fields
;
2930 for (i
= 0; i
< nr_fields
; i
++) {
2931 const struct lttng_kernel_event_field
*iter_field
;
2933 iter_field
= type
->fields
[i
];
2934 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
2938 ret
= print_tabs(session
, nesting
);
2941 alignment
= type
->alignment
;
2943 ret
= lttng_metadata_printf(session
,
2947 ret
= lttng_metadata_printf(session
,
2954 * Must be called with sessions_mutex held.
2957 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
2958 const struct lttng_kernel_event_field
*field
,
2963 ret
= _lttng_struct_type_statedump(session
,
2964 lttng_kernel_get_type_struct(field
->type
), nesting
);
2967 return lttng_field_name_statedump(session
, field
, nesting
);
2971 * Must be called with sessions_mutex held.
2974 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
2975 const struct lttng_kernel_type_variant
*type
,
2977 const char *prev_field_name
)
2979 const char *tag_name
;
2981 uint32_t i
, nr_choices
;
2983 tag_name
= type
->tag_name
;
2985 tag_name
= prev_field_name
;
2989 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2991 if (type
->alignment
!= 0)
2993 ret
= print_tabs(session
, nesting
);
2996 ret
= lttng_metadata_printf(session
,
2997 "variant <_%s> {\n",
3001 nr_choices
= type
->nr_choices
;
3002 for (i
= 0; i
< nr_choices
; i
++) {
3003 const struct lttng_kernel_event_field
*iter_field
;
3005 iter_field
= type
->choices
[i
];
3006 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3010 ret
= print_tabs(session
, nesting
);
3013 ret
= lttng_metadata_printf(session
,
3019 * Must be called with sessions_mutex held.
3022 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3023 const struct lttng_kernel_event_field
*field
,
3025 const char *prev_field_name
)
3029 ret
= _lttng_variant_type_statedump(session
,
3030 lttng_kernel_get_type_variant(field
->type
), nesting
,
3034 return lttng_field_name_statedump(session
, field
, nesting
);
3038 * Must be called with sessions_mutex held.
3041 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3042 const struct lttng_kernel_event_field
*field
,
3046 const struct lttng_kernel_type_array
*array_type
;
3047 const struct lttng_kernel_type_common
*elem_type
;
3049 array_type
= lttng_kernel_get_type_array(field
->type
);
3050 WARN_ON_ONCE(!array_type
);
3052 if (array_type
->alignment
) {
3053 ret
= print_tabs(session
, nesting
);
3056 ret
= lttng_metadata_printf(session
,
3057 "struct { } align(%u) _%s_padding;\n",
3058 array_type
->alignment
* CHAR_BIT
,
3064 * Nested compound types: Only array of structures and variants are
3065 * currently supported.
3067 elem_type
= array_type
->elem_type
;
3068 switch (elem_type
->type
) {
3069 case lttng_kernel_type_integer
:
3070 case lttng_kernel_type_struct
:
3071 case lttng_kernel_type_variant
:
3072 ret
= _lttng_type_statedump(session
, elem_type
,
3073 array_type
->encoding
, nesting
);
3081 ret
= lttng_metadata_printf(session
,
3084 array_type
->length
);
3089 * Must be called with sessions_mutex held.
3092 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3093 const struct lttng_kernel_event_field
*field
,
3095 const char *prev_field_name
)
3098 const char *length_name
;
3099 const struct lttng_kernel_type_sequence
*sequence_type
;
3100 const struct lttng_kernel_type_common
*elem_type
;
3102 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3103 WARN_ON_ONCE(!sequence_type
);
3105 length_name
= sequence_type
->length_name
;
3107 length_name
= prev_field_name
;
3111 if (sequence_type
->alignment
) {
3112 ret
= print_tabs(session
, nesting
);
3115 ret
= lttng_metadata_printf(session
,
3116 "struct { } align(%u) _%s_padding;\n",
3117 sequence_type
->alignment
* CHAR_BIT
,
3124 * Nested compound types: Only array of structures and variants are
3125 * currently supported.
3127 elem_type
= sequence_type
->elem_type
;
3128 switch (elem_type
->type
) {
3129 case lttng_kernel_type_integer
:
3130 case lttng_kernel_type_struct
:
3131 case lttng_kernel_type_variant
:
3132 ret
= _lttng_type_statedump(session
, elem_type
,
3133 sequence_type
->encoding
, nesting
);
3141 ret
= lttng_metadata_printf(session
,
3149 * Must be called with sessions_mutex held.
3152 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3153 const struct lttng_kernel_type_enum
*type
,
3156 const struct lttng_kernel_enum_desc
*enum_desc
;
3157 const struct lttng_kernel_type_common
*container_type
;
3159 unsigned int i
, nr_entries
;
3161 container_type
= type
->container_type
;
3162 if (container_type
->type
!= lttng_kernel_type_integer
) {
3166 enum_desc
= type
->desc
;
3167 nr_entries
= enum_desc
->nr_entries
;
3169 ret
= print_tabs(session
, nesting
);
3172 ret
= lttng_metadata_printf(session
, "enum : ");
3175 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3176 lttng_kernel_string_encoding_none
, 0);
3179 ret
= lttng_metadata_printf(session
, " {\n");
3182 /* Dump all entries */
3183 for (i
= 0; i
< nr_entries
; i
++) {
3184 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3187 ret
= print_tabs(session
, nesting
+ 1);
3190 ret
= lttng_metadata_printf(session
,
3194 len
= strlen(entry
->string
);
3195 /* Escape the character '"' */
3196 for (j
= 0; j
< len
; j
++) {
3197 char c
= entry
->string
[j
];
3201 ret
= lttng_metadata_printf(session
,
3205 ret
= lttng_metadata_printf(session
,
3209 ret
= lttng_metadata_printf(session
,
3216 ret
= lttng_metadata_printf(session
, "\"");
3220 if (entry
->options
.is_auto
) {
3221 ret
= lttng_metadata_printf(session
, ",\n");
3225 ret
= lttng_metadata_printf(session
,
3229 if (entry
->start
.signedness
)
3230 ret
= lttng_metadata_printf(session
,
3231 "%lld", (long long) entry
->start
.value
);
3233 ret
= lttng_metadata_printf(session
,
3234 "%llu", entry
->start
.value
);
3237 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3239 == entry
->end
.value
) {
3240 ret
= lttng_metadata_printf(session
,
3243 if (entry
->end
.signedness
) {
3244 ret
= lttng_metadata_printf(session
,
3246 (long long) entry
->end
.value
);
3248 ret
= lttng_metadata_printf(session
,
3257 ret
= print_tabs(session
, nesting
);
3260 ret
= lttng_metadata_printf(session
, "}");
3266 * Must be called with sessions_mutex held.
3269 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3270 const struct lttng_kernel_event_field
*field
,
3274 const struct lttng_kernel_type_enum
*enum_type
;
3276 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3277 WARN_ON_ONCE(!enum_type
);
3278 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3281 return lttng_field_name_statedump(session
, field
, nesting
);
3285 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3286 const struct lttng_kernel_event_field
*field
,
3291 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3292 lttng_kernel_string_encoding_none
, nesting
);
3295 return lttng_field_name_statedump(session
, field
, nesting
);
3299 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3300 const struct lttng_kernel_type_string
*type
,
3305 /* Default encoding is UTF8 */
3306 ret
= print_tabs(session
, nesting
);
3309 ret
= lttng_metadata_printf(session
,
3311 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3312 " { encoding = ASCII; }" : "");
3317 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3318 const struct lttng_kernel_event_field
*field
,
3321 const struct lttng_kernel_type_string
*string_type
;
3324 string_type
= lttng_kernel_get_type_string(field
->type
);
3325 WARN_ON_ONCE(!string_type
);
3326 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3329 return lttng_field_name_statedump(session
, field
, nesting
);
3333 * Must be called with sessions_mutex held.
3336 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3337 const struct lttng_kernel_type_common
*type
,
3338 enum lttng_kernel_string_encoding parent_encoding
,
3343 switch (type
->type
) {
3344 case lttng_kernel_type_integer
:
3345 ret
= _lttng_integer_type_statedump(session
,
3346 lttng_kernel_get_type_integer(type
),
3347 parent_encoding
, nesting
);
3349 case lttng_kernel_type_enum
:
3350 ret
= _lttng_enum_type_statedump(session
,
3351 lttng_kernel_get_type_enum(type
),
3354 case lttng_kernel_type_string
:
3355 ret
= _lttng_string_type_statedump(session
,
3356 lttng_kernel_get_type_string(type
),
3359 case lttng_kernel_type_struct
:
3360 ret
= _lttng_struct_type_statedump(session
,
3361 lttng_kernel_get_type_struct(type
),
3364 case lttng_kernel_type_variant
:
3365 ret
= _lttng_variant_type_statedump(session
,
3366 lttng_kernel_get_type_variant(type
),
3370 /* Nested arrays and sequences are not supported yet. */
3371 case lttng_kernel_type_array
:
3372 case lttng_kernel_type_sequence
:
3381 * Must be called with sessions_mutex held.
3384 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3385 const struct lttng_kernel_event_field
*field
,
3387 const char **prev_field_name_p
)
3389 const char *prev_field_name
= NULL
;
3392 if (prev_field_name_p
)
3393 prev_field_name
= *prev_field_name_p
;
3394 switch (field
->type
->type
) {
3395 case lttng_kernel_type_integer
:
3396 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3398 case lttng_kernel_type_enum
:
3399 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3401 case lttng_kernel_type_string
:
3402 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3404 case lttng_kernel_type_struct
:
3405 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3407 case lttng_kernel_type_array
:
3408 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3410 case lttng_kernel_type_sequence
:
3411 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3413 case lttng_kernel_type_variant
:
3414 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3421 if (prev_field_name_p
)
3422 *prev_field_name_p
= field
->name
;
3427 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3428 struct lttng_kernel_ctx
*ctx
)
3430 const char *prev_field_name
= NULL
;
3436 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3437 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3439 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3447 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3448 struct lttng_kernel_event_recorder
*event_recorder
)
3450 const char *prev_field_name
= NULL
;
3451 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3455 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3456 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3458 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3466 * Must be called with sessions_mutex held.
3467 * The entire event metadata is printed as a single atomic metadata
3471 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3473 struct lttng_kernel_event_recorder
*event_recorder
;
3474 struct lttng_kernel_channel_buffer
*chan
;
3475 struct lttng_kernel_session
*session
;
3478 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3480 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3481 chan
= event_recorder
->chan
;
3482 session
= chan
->parent
.session
;
3484 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3486 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3489 lttng_metadata_begin(session
);
3491 ret
= lttng_metadata_printf(session
,
3495 " stream_id = %u;\n",
3496 event_recorder
->priv
->parent
.desc
->event_name
,
3497 event_recorder
->priv
->id
,
3498 event_recorder
->chan
->priv
->id
);
3502 ret
= lttng_metadata_printf(session
,
3503 " fields := struct {\n"
3508 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3513 * LTTng space reservation can only reserve multiples of the
3516 ret
= lttng_metadata_printf(session
,
3522 event_recorder
->priv
->metadata_dumped
= 1;
3524 lttng_metadata_end(session
);
3530 * Must be called with sessions_mutex held.
3531 * The entire channel metadata is printed as a single atomic metadata
3535 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3536 struct lttng_kernel_channel_buffer
*chan
)
3540 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3543 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3546 lttng_metadata_begin(session
);
3548 WARN_ON_ONCE(!chan
->priv
->header_type
);
3549 ret
= lttng_metadata_printf(session
,
3552 " event.header := %s;\n"
3553 " packet.context := struct packet_context;\n",
3555 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3556 "struct event_header_large");
3560 if (chan
->priv
->ctx
) {
3561 ret
= lttng_metadata_printf(session
,
3562 " event.context := struct {\n");
3566 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3569 if (chan
->priv
->ctx
) {
3570 ret
= lttng_metadata_printf(session
,
3576 ret
= lttng_metadata_printf(session
,
3579 chan
->priv
->metadata_dumped
= 1;
3581 lttng_metadata_end(session
);
3586 * Must be called with sessions_mutex held.
3589 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3591 return lttng_metadata_printf(session
,
3592 "struct packet_context {\n"
3593 " uint64_clock_monotonic_t timestamp_begin;\n"
3594 " uint64_clock_monotonic_t timestamp_end;\n"
3595 " uint64_t content_size;\n"
3596 " uint64_t packet_size;\n"
3597 " uint64_t packet_seq_num;\n"
3598 " unsigned long events_discarded;\n"
3599 " uint32_t cpu_id;\n"
3606 * id: range: 0 - 30.
3607 * id 31 is reserved to indicate an extended header.
3610 * id: range: 0 - 65534.
3611 * id 65535 is reserved to indicate an extended header.
3613 * Must be called with sessions_mutex held.
3616 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3618 return lttng_metadata_printf(session
,
3619 "struct event_header_compact {\n"
3620 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3623 " uint27_clock_monotonic_t timestamp;\n"
3627 " uint64_clock_monotonic_t timestamp;\n"
3632 "struct event_header_large {\n"
3633 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3636 " uint32_clock_monotonic_t timestamp;\n"
3640 " uint64_clock_monotonic_t timestamp;\n"
3644 lttng_alignof(uint32_t) * CHAR_BIT
,
3645 lttng_alignof(uint16_t) * CHAR_BIT
3650 * Approximation of NTP time of day to clock monotonic correlation,
3651 * taken at start of trace.
3652 * Yes, this is only an approximation. Yes, we can (and will) do better
3653 * in future versions.
3654 * This function may return a negative offset. It may happen if the
3655 * system sets the REALTIME clock to 0 after boot.
3657 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3661 int64_t measure_clock_offset(void)
3663 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3664 uint64_t tcf
= trace_clock_freq();
3666 unsigned long flags
;
3667 struct timespec64 rts
= { 0, 0 };
3669 /* Disable interrupts to increase correlation precision. */
3670 local_irq_save(flags
);
3671 monotonic
[0] = trace_clock_read64();
3672 ktime_get_real_ts64(&rts
);
3673 monotonic
[1] = trace_clock_read64();
3674 local_irq_restore(flags
);
3676 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3677 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3678 if (tcf
== NSEC_PER_SEC
) {
3679 realtime
+= rts
.tv_nsec
;
3681 uint64_t n
= rts
.tv_nsec
* tcf
;
3683 do_div(n
, NSEC_PER_SEC
);
3686 offset
= (int64_t) realtime
- monotonic_avg
;
3691 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3699 while (cur
!= '\0') {
3702 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3706 ret
= lttng_metadata_printf(session
, "%c", '\\');
3709 /* We still print the current char */
3712 ret
= lttng_metadata_printf(session
, "%c", cur
);
3726 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3727 const char *field_value
)
3731 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3735 ret
= print_escaped_ctf_string(session
, field_value
);
3739 ret
= lttng_metadata_printf(session
, "\";\n");
3746 * Output metadata into this session's metadata buffers.
3747 * Must be called with sessions_mutex held.
3750 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3752 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3753 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3754 const char *product_uuid
;
3755 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3756 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3759 if (!LTTNG_READ_ONCE(session
->active
))
3762 lttng_metadata_begin(session
);
3764 if (session
->priv
->metadata_dumped
)
3767 snprintf(uuid_s
, sizeof(uuid_s
),
3768 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3769 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3770 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3771 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3772 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3774 ret
= lttng_metadata_printf(session
,
3775 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3776 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3777 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3778 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3779 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3780 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3781 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3787 " byte_order = %s;\n"
3788 " packet.header := struct {\n"
3789 " uint32_t magic;\n"
3790 " uint8_t uuid[16];\n"
3791 " uint32_t stream_id;\n"
3792 " uint64_t stream_instance_id;\n"
3795 lttng_alignof(uint8_t) * CHAR_BIT
,
3796 lttng_alignof(uint16_t) * CHAR_BIT
,
3797 lttng_alignof(uint32_t) * CHAR_BIT
,
3798 lttng_alignof(uint64_t) * CHAR_BIT
,
3799 sizeof(unsigned long) * CHAR_BIT
,
3800 lttng_alignof(unsigned long) * CHAR_BIT
,
3804 #if __BYTE_ORDER == __BIG_ENDIAN
3813 ret
= lttng_metadata_printf(session
,
3815 " hostname = \"%s\";\n"
3816 " domain = \"kernel\";\n"
3817 " sysname = \"%s\";\n"
3818 " kernel_release = \"%s\";\n"
3819 " kernel_version = \"%s\";\n"
3820 " tracer_name = \"lttng-modules\";\n"
3821 " tracer_major = %d;\n"
3822 " tracer_minor = %d;\n"
3823 " tracer_patchlevel = %d;\n"
3824 " trace_buffering_scheme = \"global\";\n",
3825 current
->nsproxy
->uts_ns
->name
.nodename
,
3829 LTTNG_MODULES_MAJOR_VERSION
,
3830 LTTNG_MODULES_MINOR_VERSION
,
3831 LTTNG_MODULES_PATCHLEVEL_VERSION
3836 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3839 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3840 session
->priv
->creation_time
);
3844 /* Add the product UUID to the 'env' section */
3845 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3847 ret
= lttng_metadata_printf(session
,
3848 " product_uuid = \"%s\";\n",
3855 /* Close the 'env' section */
3856 ret
= lttng_metadata_printf(session
, "};\n\n");
3860 ret
= lttng_metadata_printf(session
,
3862 " name = \"%s\";\n",
3868 if (!trace_clock_uuid(clock_uuid_s
)) {
3869 ret
= lttng_metadata_printf(session
,
3870 " uuid = \"%s\";\n",
3877 ret
= lttng_metadata_printf(session
,
3878 " description = \"%s\";\n"
3879 " freq = %llu; /* Frequency, in Hz */\n"
3880 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3883 trace_clock_description(),
3884 (unsigned long long) trace_clock_freq(),
3885 (long long) measure_clock_offset()
3890 ret
= lttng_metadata_printf(session
,
3891 "typealias integer {\n"
3892 " size = 27; align = 1; signed = false;\n"
3893 " map = clock.%s.value;\n"
3894 "} := uint27_clock_monotonic_t;\n"
3896 "typealias integer {\n"
3897 " size = 32; align = %u; signed = false;\n"
3898 " map = clock.%s.value;\n"
3899 "} := uint32_clock_monotonic_t;\n"
3901 "typealias integer {\n"
3902 " size = 64; align = %u; signed = false;\n"
3903 " map = clock.%s.value;\n"
3904 "} := uint64_clock_monotonic_t;\n\n",
3906 lttng_alignof(uint32_t) * CHAR_BIT
,
3908 lttng_alignof(uint64_t) * CHAR_BIT
,
3914 ret
= _lttng_stream_packet_context_declare(session
);
3918 ret
= _lttng_event_header_declare(session
);
3923 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
3924 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
3929 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
3930 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
3934 session
->priv
->metadata_dumped
= 1;
3936 lttng_metadata_end(session
);
3941 * lttng_transport_register - LTT transport registration
3942 * @transport: transport structure
3944 * Registers a transport which can be used as output to extract the data out of
3945 * LTTng. The module calling this registration function must ensure that no
3946 * trap-inducing code will be executed by the transport functions. E.g.
3947 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3948 * is made visible to the transport function. This registration acts as a
3949 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3950 * after its registration must it synchronize the TLBs.
3952 void lttng_transport_register(struct lttng_transport
*transport
)
3955 * Make sure no page fault can be triggered by the module about to be
3956 * registered. We deal with this here so we don't have to call
3957 * vmalloc_sync_mappings() in each module's init.
3959 wrapper_vmalloc_sync_mappings();
3961 mutex_lock(&sessions_mutex
);
3962 list_add_tail(&transport
->node
, <tng_transport_list
);
3963 mutex_unlock(&sessions_mutex
);
3965 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3968 * lttng_transport_unregister - LTT transport unregistration
3969 * @transport: transport structure
3971 void lttng_transport_unregister(struct lttng_transport
*transport
)
3973 mutex_lock(&sessions_mutex
);
3974 list_del(&transport
->node
);
3975 mutex_unlock(&sessions_mutex
);
3977 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
3979 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
3982 * Make sure no page fault can be triggered by the module about to be
3983 * registered. We deal with this here so we don't have to call
3984 * vmalloc_sync_mappings() in each module's init.
3986 wrapper_vmalloc_sync_mappings();
3988 mutex_lock(&sessions_mutex
);
3989 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
3990 mutex_unlock(&sessions_mutex
);
3992 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
3994 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
3996 mutex_lock(&sessions_mutex
);
3997 list_del(&transport
->node
);
3998 mutex_unlock(&sessions_mutex
);
4000 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4002 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4004 enum cpuhp_state lttng_hp_prepare
;
4005 enum cpuhp_state lttng_hp_online
;
4007 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4009 struct lttng_cpuhp_node
*lttng_node
;
4011 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4012 switch (lttng_node
->component
) {
4013 case LTTNG_RING_BUFFER_FRONTEND
:
4015 case LTTNG_RING_BUFFER_BACKEND
:
4016 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4017 case LTTNG_RING_BUFFER_ITER
:
4019 case LTTNG_CONTEXT_PERF_COUNTERS
:
4026 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4028 struct lttng_cpuhp_node
*lttng_node
;
4030 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4031 switch (lttng_node
->component
) {
4032 case LTTNG_RING_BUFFER_FRONTEND
:
4033 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4034 case LTTNG_RING_BUFFER_BACKEND
:
4036 case LTTNG_RING_BUFFER_ITER
:
4038 case LTTNG_CONTEXT_PERF_COUNTERS
:
4039 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4045 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4047 struct lttng_cpuhp_node
*lttng_node
;
4049 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4050 switch (lttng_node
->component
) {
4051 case LTTNG_RING_BUFFER_FRONTEND
:
4052 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4053 case LTTNG_RING_BUFFER_BACKEND
:
4055 case LTTNG_RING_BUFFER_ITER
:
4056 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4057 case LTTNG_CONTEXT_PERF_COUNTERS
:
4058 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4064 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4066 struct lttng_cpuhp_node
*lttng_node
;
4068 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4069 switch (lttng_node
->component
) {
4070 case LTTNG_RING_BUFFER_FRONTEND
:
4071 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4072 case LTTNG_RING_BUFFER_BACKEND
:
4074 case LTTNG_RING_BUFFER_ITER
:
4076 case LTTNG_CONTEXT_PERF_COUNTERS
:
4083 static int __init
lttng_init_cpu_hotplug(void)
4087 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4088 lttng_hotplug_prepare
,
4089 lttng_hotplug_dead
);
4093 lttng_hp_prepare
= ret
;
4094 lttng_rb_set_hp_prepare(ret
);
4096 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4097 lttng_hotplug_online
,
4098 lttng_hotplug_offline
);
4100 cpuhp_remove_multi_state(lttng_hp_prepare
);
4101 lttng_hp_prepare
= 0;
4104 lttng_hp_online
= ret
;
4105 lttng_rb_set_hp_online(ret
);
4110 static void __exit
lttng_exit_cpu_hotplug(void)
4112 lttng_rb_set_hp_online(0);
4113 cpuhp_remove_multi_state(lttng_hp_online
);
4114 lttng_rb_set_hp_prepare(0);
4115 cpuhp_remove_multi_state(lttng_hp_prepare
);
4118 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4119 static int lttng_init_cpu_hotplug(void)
4123 static void lttng_exit_cpu_hotplug(void)
4126 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4128 static int __init
lttng_events_init(void)
4132 ret
= wrapper_get_pfnblock_flags_mask_init();
4135 ret
= lttng_probes_init();
4138 ret
= lttng_context_init();
4141 ret
= lttng_tracepoint_init();
4144 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4145 if (!event_recorder_cache
) {
4147 goto error_kmem_event_recorder
;
4149 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4150 if (!event_recorder_private_cache
) {
4152 goto error_kmem_event_recorder_private
;
4154 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4155 if (!event_notifier_cache
) {
4157 goto error_kmem_event_notifier
;
4159 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4160 if (!event_notifier_private_cache
) {
4162 goto error_kmem_event_notifier_private
;
4164 ret
= lttng_abi_init();
4167 ret
= lttng_logger_init();
4170 ret
= lttng_init_cpu_hotplug();
4173 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4174 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4175 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4176 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4177 LTTNG_MODULES_EXTRAVERSION
,
4179 #ifdef LTTNG_EXTRA_VERSION_GIT
4180 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4184 #ifdef LTTNG_EXTRA_VERSION_NAME
4185 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4189 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4190 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4191 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4195 lttng_logger_exit();
4199 kmem_cache_destroy(event_notifier_private_cache
);
4200 error_kmem_event_notifier_private
:
4201 kmem_cache_destroy(event_notifier_cache
);
4202 error_kmem_event_notifier
:
4203 kmem_cache_destroy(event_recorder_private_cache
);
4204 error_kmem_event_recorder_private
:
4205 kmem_cache_destroy(event_recorder_cache
);
4206 error_kmem_event_recorder
:
4207 lttng_tracepoint_exit();
4209 lttng_context_exit();
4210 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4211 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4212 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4213 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4214 LTTNG_MODULES_EXTRAVERSION
,
4216 #ifdef LTTNG_EXTRA_VERSION_GIT
4217 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4221 #ifdef LTTNG_EXTRA_VERSION_NAME
4222 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4229 module_init(lttng_events_init
);
4231 static void __exit
lttng_events_exit(void)
4233 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4235 lttng_exit_cpu_hotplug();
4236 lttng_logger_exit();
4238 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4239 lttng_session_destroy(session_priv
->pub
);
4240 kmem_cache_destroy(event_recorder_cache
);
4241 kmem_cache_destroy(event_recorder_private_cache
);
4242 kmem_cache_destroy(event_notifier_cache
);
4243 kmem_cache_destroy(event_notifier_private_cache
);
4244 lttng_tracepoint_exit();
4245 lttng_context_exit();
4246 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4247 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4248 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4249 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4250 LTTNG_MODULES_EXTRAVERSION
,
4252 #ifdef LTTNG_EXTRA_VERSION_GIT
4253 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4257 #ifdef LTTNG_EXTRA_VERSION_NAME
4258 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4264 module_exit(lttng_events_exit
);
4266 #include <generated/patches.h>
4267 #ifdef LTTNG_EXTRA_VERSION_GIT
4268 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4270 #ifdef LTTNG_EXTRA_VERSION_NAME
4271 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4273 MODULE_LICENSE("GPL and additional rights");
4274 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4275 MODULE_DESCRIPTION("LTTng tracer");
4276 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4277 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4278 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4279 LTTNG_MODULES_EXTRAVERSION
);