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
);
1550 struct lttng_kernel_id_tracker
*get_tracker(struct lttng_kernel_session
*session
,
1551 enum tracker_type tracker_type
)
1553 switch (tracker_type
) {
1555 return &session
->pid_tracker
;
1557 return &session
->vpid_tracker
;
1559 return &session
->uid_tracker
;
1561 return &session
->vuid_tracker
;
1563 return &session
->gid_tracker
;
1565 return &session
->vgid_tracker
;
1572 int lttng_session_track_id(struct lttng_kernel_session
*session
,
1573 enum tracker_type tracker_type
, int id
)
1575 struct lttng_kernel_id_tracker
*tracker
;
1578 tracker
= get_tracker(session
, tracker_type
);
1583 mutex_lock(&sessions_mutex
);
1585 /* track all ids: destroy tracker. */
1586 lttng_id_tracker_destroy(tracker
, true);
1589 ret
= lttng_id_tracker_add(tracker
, id
);
1591 mutex_unlock(&sessions_mutex
);
1595 int lttng_session_untrack_id(struct lttng_kernel_session
*session
,
1596 enum tracker_type tracker_type
, int id
)
1598 struct lttng_kernel_id_tracker
*tracker
;
1601 tracker
= get_tracker(session
, tracker_type
);
1606 mutex_lock(&sessions_mutex
);
1608 /* untrack all ids: replace by empty tracker. */
1609 ret
= lttng_id_tracker_empty_set(tracker
);
1611 ret
= lttng_id_tracker_del(tracker
, id
);
1613 mutex_unlock(&sessions_mutex
);
1618 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1620 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1621 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1622 struct lttng_id_hash_node
*e
;
1625 mutex_lock(&sessions_mutex
);
1627 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1628 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1630 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1636 /* ID tracker disabled. */
1637 if (iter
>= *pos
&& iter
== 0) {
1638 return id_tracker_p
; /* empty tracker */
1646 /* Called with sessions_mutex held. */
1648 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1650 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1651 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1652 struct lttng_id_hash_node
*e
;
1657 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1658 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1660 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1661 if (iter
++ >= *ppos
)
1666 /* ID tracker disabled. */
1667 if (iter
>= *ppos
&& iter
== 0)
1668 return p
; /* empty tracker */
1677 void id_list_stop(struct seq_file
*m
, void *p
)
1679 mutex_unlock(&sessions_mutex
);
1683 int id_list_show(struct seq_file
*m
, void *p
)
1685 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1686 struct lttng_kernel_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1689 if (p
== id_tracker_p
) {
1690 /* Tracker disabled. */
1693 const struct lttng_id_hash_node
*e
= p
;
1695 id
= lttng_id_tracker_get_node_id(e
);
1697 switch (id_tracker
->priv
->tracker_type
) {
1699 seq_printf(m
, "process { pid = %d; };\n", id
);
1702 seq_printf(m
, "process { vpid = %d; };\n", id
);
1705 seq_printf(m
, "user { uid = %d; };\n", id
);
1708 seq_printf(m
, "user { vuid = %d; };\n", id
);
1711 seq_printf(m
, "group { gid = %d; };\n", id
);
1714 seq_printf(m
, "group { vgid = %d; };\n", id
);
1717 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1723 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1724 .start
= id_list_start
,
1725 .next
= id_list_next
,
1726 .stop
= id_list_stop
,
1727 .show
= id_list_show
,
1731 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1733 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1737 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1739 struct seq_file
*m
= file
->private_data
;
1740 struct lttng_kernel_id_tracker
*id_tracker
= m
->private;
1743 WARN_ON_ONCE(!id_tracker
);
1744 ret
= seq_release(inode
, file
);
1746 fput(id_tracker
->priv
->session
->priv
->file
);
1750 const struct file_operations lttng_tracker_ids_list_fops
= {
1751 .owner
= THIS_MODULE
,
1752 .open
= lttng_tracker_ids_list_open
,
1754 .llseek
= seq_lseek
,
1755 .release
= lttng_tracker_ids_list_release
,
1758 int lttng_session_list_tracker_ids(struct lttng_kernel_session
*session
,
1759 enum tracker_type tracker_type
)
1761 struct file
*tracker_ids_list_file
;
1765 file_fd
= get_unused_fd_flags(0);
1771 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1772 <tng_tracker_ids_list_fops
,
1774 if (IS_ERR(tracker_ids_list_file
)) {
1775 ret
= PTR_ERR(tracker_ids_list_file
);
1778 if (!atomic_long_add_unless(&session
->priv
->file
->f_count
, 1, LONG_MAX
)) {
1780 goto refcount_error
;
1782 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1785 m
= tracker_ids_list_file
->private_data
;
1787 m
->private = get_tracker(session
, tracker_type
);
1788 BUG_ON(!m
->private);
1789 fd_install(file_fd
, tracker_ids_list_file
);
1794 atomic_long_dec(&session
->priv
->file
->f_count
);
1796 fput(tracker_ids_list_file
);
1798 put_unused_fd(file_fd
);
1804 * Enabler management.
1807 int lttng_match_enabler_star_glob(const char *desc_name
,
1808 const char *pattern
)
1810 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1811 desc_name
, LTTNG_SIZE_MAX
))
1817 int lttng_match_enabler_name(const char *desc_name
,
1820 if (strcmp(desc_name
, name
))
1826 int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc
*desc
,
1827 struct lttng_event_enabler_common
*enabler
)
1829 const char *desc_name
, *enabler_name
;
1830 bool compat
= false, entry
= false;
1832 enabler_name
= enabler
->event_param
.name
;
1833 switch (enabler
->event_param
.instrumentation
) {
1834 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1835 desc_name
= desc
->event_name
;
1836 switch (enabler
->format_type
) {
1837 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1838 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1839 case LTTNG_ENABLER_FORMAT_NAME
:
1840 return lttng_match_enabler_name(desc_name
, enabler_name
);
1846 case LTTNG_KERNEL_ABI_SYSCALL
:
1847 desc_name
= desc
->event_name
;
1848 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1849 desc_name
+= strlen("compat_");
1852 if (!strncmp(desc_name
, "syscall_exit_",
1853 strlen("syscall_exit_"))) {
1854 desc_name
+= strlen("syscall_exit_");
1855 } else if (!strncmp(desc_name
, "syscall_entry_",
1856 strlen("syscall_entry_"))) {
1857 desc_name
+= strlen("syscall_entry_");
1863 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1864 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1866 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1870 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1877 switch (enabler
->event_param
.u
.syscall
.abi
) {
1878 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1880 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1884 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1891 switch (enabler
->event_param
.u
.syscall
.match
) {
1892 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1893 switch (enabler
->format_type
) {
1894 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1895 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1896 case LTTNG_ENABLER_FORMAT_NAME
:
1897 return lttng_match_enabler_name(desc_name
, enabler_name
);
1902 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1903 return -EINVAL
; /* Not implemented. */
1915 bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1916 struct lttng_event_enabler_common
*enabler
)
1920 ret
= lttng_desc_match_enabler_check(desc
, enabler
);
1928 bool lttng_event_enabler_match_event(struct lttng_event_enabler_common
*event_enabler
,
1929 struct lttng_kernel_event_common
*event
)
1931 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1934 switch (event_enabler
->enabler_type
) {
1935 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1937 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1938 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1939 struct lttng_kernel_event_recorder
*event_recorder
=
1940 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1942 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1943 && event_recorder
->chan
== event_recorder_enabler
->chan
)
1948 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1950 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1951 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1952 struct lttng_kernel_event_notifier
*event_notifier
=
1953 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1955 if (lttng_desc_match_enabler(event
->priv
->desc
, event_enabler
)
1956 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1957 && event
->priv
->user_token
== event_enabler
->user_token
)
1968 bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common
*event_enabler
,
1969 const struct lttng_kernel_event_desc
*desc
,
1970 struct lttng_kernel_event_common
*event
)
1972 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
1975 switch (event_enabler
->enabler_type
) {
1976 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
1978 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
1979 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
1980 struct lttng_kernel_event_recorder
*event_recorder
=
1981 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
1983 if (event
->priv
->desc
== desc
&& event_recorder
->chan
== event_recorder_enabler
->chan
)
1988 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
1990 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
1991 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1992 struct lttng_kernel_event_notifier
*event_notifier
=
1993 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
1995 if (event
->priv
->desc
== desc
1996 && event_notifier
->priv
->group
== event_notifier_enabler
->group
1997 && event
->priv
->user_token
== event_enabler
->user_token
)
2008 bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common
*event_enabler
,
2009 const char *event_name
,
2010 struct lttng_kernel_event_common
*event
)
2012 if (event_enabler
->event_param
.instrumentation
!= event
->priv
->instrumentation
)
2015 switch (event_enabler
->enabler_type
) {
2016 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2018 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2019 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2020 struct lttng_kernel_event_recorder
*event_recorder
=
2021 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2023 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2024 && event_recorder
->chan
== event_recorder_enabler
->chan
)
2029 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2031 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2032 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2033 struct lttng_kernel_event_notifier
*event_notifier
=
2034 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2036 if (!strncmp(event
->priv
->desc
->event_name
, event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
2037 && event_notifier
->priv
->group
== event_notifier_enabler
->group
2038 && event
->priv
->user_token
== event_enabler
->user_token
)
2050 struct lttng_enabler_ref
*lttng_enabler_ref(
2051 struct list_head
*enablers_ref_list
,
2052 struct lttng_event_enabler_common
*enabler
)
2054 struct lttng_enabler_ref
*enabler_ref
;
2056 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2057 if (enabler_ref
->ref
== enabler
)
2064 void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2066 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(event_enabler
);
2067 struct lttng_kernel_probe_desc
*probe_desc
;
2068 const struct lttng_kernel_event_desc
*desc
;
2069 struct list_head
*probe_list
;
2072 probe_list
= lttng_get_probe_list_head();
2074 * For each probe event, if we find that a probe event matches
2075 * our enabler, create an associated lttng_event if not
2078 list_for_each_entry(probe_desc
, probe_list
, head
) {
2079 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2081 struct hlist_head
*head
;
2082 struct lttng_kernel_event_common
*event
;
2083 struct lttng_kernel_event_common_private
*event_priv
;
2085 desc
= probe_desc
->event_desc
[i
];
2086 if (!lttng_desc_match_enabler(desc
, event_enabler
))
2090 * Check if already created.
2092 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
2093 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
2094 if (lttng_event_enabler_desc_match_event(event_enabler
, desc
, event_priv
->pub
)) {
2103 * We need to create an event for this event probe.
2105 event
= _lttng_kernel_event_create(event_enabler
, desc
);
2106 if (IS_ERR(event
)) {
2107 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2108 probe_desc
->event_desc
[i
]->event_name
);
2115 * Create event if it is missing and present in the list of tracepoint probes.
2116 * Should be called with sessions mutex held.
2119 void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common
*event_enabler
)
2123 switch (event_enabler
->event_param
.instrumentation
) {
2124 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2125 lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler
);
2128 case LTTNG_KERNEL_ABI_SYSCALL
:
2129 ret
= lttng_event_enabler_create_syscall_events_if_missing(event_enabler
);
2140 void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common
*event_enabler
,
2141 struct lttng_kernel_event_common
*event
)
2143 /* Link filter bytecodes if not linked yet. */
2144 lttng_enabler_link_bytecode(event
->priv
->desc
, lttng_static_ctx
,
2145 &event
->priv
->filter_bytecode_runtime_head
, &event_enabler
->filter_bytecode_head
);
2149 void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common
*event_enabler
,
2150 struct lttng_kernel_event_common
*event
)
2152 switch (event_enabler
->enabler_type
) {
2153 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2155 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2157 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2158 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2159 struct lttng_kernel_event_notifier
*event_notifier
=
2160 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2162 /* Link capture bytecodes if not linked yet. */
2163 lttng_enabler_link_bytecode(event
->priv
->desc
,
2164 lttng_static_ctx
, &event_notifier
->priv
->capture_bytecode_runtime_head
,
2165 &event_notifier_enabler
->capture_bytecode_head
);
2166 event_notifier
->priv
->num_captures
= event_notifier_enabler
->num_captures
;
2175 * Create events associated with an event_enabler (if not already present),
2176 * and add backward reference from the event to the enabler.
2177 * Should be called with sessions mutex held.
2180 int lttng_event_enabler_ref_events(struct lttng_event_enabler_common
*event_enabler
)
2182 struct list_head
*event_list_head
= lttng_get_event_list_head_from_enabler(event_enabler
);
2183 struct lttng_kernel_event_common_private
*event_priv
;
2185 lttng_syscall_table_set_wildcard_all(event_enabler
);
2187 /* First ensure that probe events are created for this enabler. */
2188 lttng_event_enabler_create_events_if_missing(event_enabler
);
2190 /* Link the created event with its associated enabler. */
2191 list_for_each_entry(event_priv
, event_list_head
, node
) {
2192 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2193 struct lttng_enabler_ref
*enabler_ref
;
2195 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2198 enabler_ref
= lttng_enabler_ref(&event_priv
->enablers_ref_head
, event_enabler
);
2201 * If no backward ref, create it.
2202 * Add backward ref from event_notifier to enabler.
2204 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2208 enabler_ref
->ref
= event_enabler
;
2209 list_add(&enabler_ref
->node
, &event_priv
->enablers_ref_head
);
2212 lttng_event_enabler_init_event_filter(event_enabler
, event
);
2213 lttng_event_enabler_init_event_capture(event_enabler
, event
);
2219 * Called at module load: connect the probe on all enablers matching
2221 * Called with sessions lock held.
2223 int lttng_fix_pending_events(void)
2225 struct lttng_kernel_session_private
*session_priv
;
2227 list_for_each_entry(session_priv
, &sessions
, list
)
2228 lttng_session_lazy_sync_event_enablers(session_priv
->pub
);
2232 static bool lttng_event_notifier_group_has_active_event_notifiers(
2233 struct lttng_event_notifier_group
*event_notifier_group
)
2235 struct lttng_event_enabler_common
*event_enabler
;
2237 list_for_each_entry(event_enabler
, &event_notifier_group
->enablers_head
, node
) {
2238 if (event_enabler
->enabled
)
2244 bool lttng_event_notifier_active(void)
2246 struct lttng_event_notifier_group
*event_notifier_group
;
2248 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2249 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2255 int lttng_fix_pending_event_notifiers(void)
2257 struct lttng_event_notifier_group
*event_notifier_group
;
2259 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2260 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2264 struct lttng_event_recorder_enabler
*lttng_event_recorder_enabler_create(
2265 enum lttng_enabler_format_type format_type
,
2266 struct lttng_kernel_abi_event
*event_param
,
2267 struct lttng_kernel_channel_buffer
*chan
)
2269 struct lttng_event_recorder_enabler
*event_enabler
;
2271 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2274 event_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_RECORDER
;
2275 event_enabler
->parent
.format_type
= format_type
;
2276 INIT_LIST_HEAD(&event_enabler
->parent
.filter_bytecode_head
);
2277 memcpy(&event_enabler
->parent
.event_param
, event_param
,
2278 sizeof(event_enabler
->parent
.event_param
));
2279 event_enabler
->chan
= chan
;
2281 event_enabler
->parent
.enabled
= 0;
2282 return event_enabler
;
2285 void lttng_event_enabler_session_add(struct lttng_kernel_session
*session
,
2286 struct lttng_event_recorder_enabler
*event_enabler
)
2288 mutex_lock(&sessions_mutex
);
2289 list_add(&event_enabler
->parent
.node
, &session
->priv
->enablers_head
);
2290 event_enabler
->parent
.published
= true;
2291 lttng_session_lazy_sync_event_enablers(session
);
2292 mutex_unlock(&sessions_mutex
);
2295 int lttng_event_enabler_enable(struct lttng_event_enabler_common
*event_enabler
)
2297 mutex_lock(&sessions_mutex
);
2298 event_enabler
->enabled
= 1;
2299 lttng_event_enabler_sync(event_enabler
);
2300 mutex_unlock(&sessions_mutex
);
2304 int lttng_event_enabler_disable(struct lttng_event_enabler_common
*event_enabler
)
2306 mutex_lock(&sessions_mutex
);
2307 event_enabler
->enabled
= 0;
2308 lttng_event_enabler_sync(event_enabler
);
2309 mutex_unlock(&sessions_mutex
);
2314 int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*enabler
,
2315 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2317 struct lttng_kernel_bytecode_node
*bytecode_node
;
2318 uint32_t bytecode_len
;
2321 ret
= get_user(bytecode_len
, &bytecode
->len
);
2324 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2328 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2329 sizeof(*bytecode
) + bytecode_len
);
2333 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_FILTER
;
2334 bytecode_node
->enabler
= enabler
;
2335 /* Enforce length based on allocated size */
2336 bytecode_node
->bc
.len
= bytecode_len
;
2337 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2342 lttng_kvfree(bytecode_node
);
2346 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common
*event_enabler
,
2347 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2350 ret
= lttng_enabler_attach_filter_bytecode(event_enabler
, bytecode
);
2353 lttng_event_enabler_sync(event_enabler
);
2360 int lttng_event_add_callsite(struct lttng_kernel_event_common
*event
,
2361 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2364 switch (event
->priv
->instrumentation
) {
2365 case LTTNG_KERNEL_ABI_UPROBE
:
2366 return lttng_uprobes_event_add_callsite(event
, callsite
);
2373 void lttng_enabler_destroy(struct lttng_event_enabler_common
*enabler
)
2375 struct lttng_kernel_bytecode_node
*filter_node
, *tmp_filter_node
;
2377 /* Destroy filter bytecode */
2378 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2379 &enabler
->filter_bytecode_head
, node
) {
2380 lttng_kvfree(filter_node
);
2384 void lttng_event_enabler_destroy(struct lttng_event_enabler_common
*event_enabler
)
2386 lttng_enabler_destroy(event_enabler
);
2387 if (event_enabler
->published
)
2388 list_del(&event_enabler
->node
);
2390 switch (event_enabler
->enabler_type
) {
2391 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2393 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2394 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2396 kfree(event_recorder_enabler
);
2399 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2401 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2402 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2404 kfree(event_notifier_enabler
);
2412 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2413 enum lttng_enabler_format_type format_type
,
2414 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
2415 struct lttng_event_notifier_group
*event_notifier_group
)
2417 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2419 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2420 if (!event_notifier_enabler
)
2423 event_notifier_enabler
->parent
.enabler_type
= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
;
2424 event_notifier_enabler
->parent
.format_type
= format_type
;
2425 INIT_LIST_HEAD(&event_notifier_enabler
->parent
.filter_bytecode_head
);
2426 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2428 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2429 event_notifier_enabler
->num_captures
= 0;
2431 memcpy(&event_notifier_enabler
->parent
.event_param
, &event_notifier_param
->event
,
2432 sizeof(event_notifier_enabler
->parent
.event_param
));
2434 event_notifier_enabler
->parent
.enabled
= 0;
2435 event_notifier_enabler
->parent
.user_token
= event_notifier_param
->event
.token
;
2436 event_notifier_enabler
->group
= event_notifier_group
;
2437 return event_notifier_enabler
;
2440 void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group
*event_notifier_group
,
2441 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2443 mutex_lock(&sessions_mutex
);
2444 list_add(&event_notifier_enabler
->parent
.node
, &event_notifier_enabler
->group
->enablers_head
);
2445 event_notifier_enabler
->parent
.published
= true;
2446 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2447 mutex_unlock(&sessions_mutex
);
2450 int lttng_event_notifier_enabler_enable(
2451 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2453 mutex_lock(&sessions_mutex
);
2454 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2455 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2456 mutex_unlock(&sessions_mutex
);
2460 int lttng_event_notifier_enabler_disable(
2461 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2463 mutex_lock(&sessions_mutex
);
2464 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2465 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2466 mutex_unlock(&sessions_mutex
);
2470 int lttng_event_notifier_enabler_attach_capture_bytecode(
2471 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2472 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2474 struct lttng_kernel_bytecode_node
*bytecode_node
;
2475 struct lttng_event_enabler_common
*enabler
=
2476 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2477 uint32_t bytecode_len
;
2480 ret
= get_user(bytecode_len
, &bytecode
->len
);
2484 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2489 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2490 sizeof(*bytecode
) + bytecode_len
);
2494 bytecode_node
->type
= LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE
;
2495 bytecode_node
->enabler
= enabler
;
2497 /* Enforce length based on allocated size */
2498 bytecode_node
->bc
.len
= bytecode_len
;
2499 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2501 event_notifier_enabler
->num_captures
++;
2503 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2507 lttng_kvfree(bytecode_node
);
2513 void lttng_event_sync_filter_state(struct lttng_kernel_event_common
*event
)
2515 int has_enablers_without_filter_bytecode
= 0, nr_filters
= 0;
2516 struct lttng_kernel_bytecode_runtime
*runtime
;
2517 struct lttng_enabler_ref
*enabler_ref
;
2519 /* Check if has enablers without bytecode enabled */
2520 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2521 if (enabler_ref
->ref
->enabled
2522 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2523 has_enablers_without_filter_bytecode
= 1;
2527 event
->priv
->has_enablers_without_filter_bytecode
= has_enablers_without_filter_bytecode
;
2529 /* Enable filters */
2530 list_for_each_entry(runtime
, &event
->priv
->filter_bytecode_runtime_head
, node
) {
2531 lttng_bytecode_sync_state(runtime
);
2534 WRITE_ONCE(event
->eval_filter
, !(has_enablers_without_filter_bytecode
|| !nr_filters
));
2538 void lttng_event_sync_capture_state(struct lttng_kernel_event_common
*event
)
2540 switch (event
->type
) {
2541 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2543 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2545 struct lttng_kernel_event_notifier
*event_notifier
=
2546 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
2547 struct lttng_kernel_bytecode_runtime
*runtime
;
2548 int nr_captures
= 0;
2550 /* Enable captures */
2551 list_for_each_entry(runtime
, &event_notifier
->priv
->capture_bytecode_runtime_head
, node
) {
2552 lttng_bytecode_sync_state(runtime
);
2555 WRITE_ONCE(event_notifier
->eval_capture
, !!nr_captures
);
2564 bool lttng_get_event_enabled_state(struct lttng_kernel_event_common
*event
)
2566 struct lttng_enabler_ref
*enabler_ref
;
2567 bool enabled
= false;
2569 switch (event
->priv
->instrumentation
) {
2570 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2572 case LTTNG_KERNEL_ABI_SYSCALL
:
2574 list_for_each_entry(enabler_ref
, &event
->priv
->enablers_ref_head
, node
) {
2575 if (enabler_ref
->ref
->enabled
) {
2586 switch (event
->type
) {
2587 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
2589 struct lttng_kernel_event_recorder
*event_recorder
=
2590 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
2593 * Enabled state is based on union of enablers, with
2594 * intersection of session and channel transient enable
2597 return enabled
&& event_recorder
->chan
->parent
.session
->priv
->tstate
&& event_recorder
->chan
->priv
->parent
.tstate
;
2599 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
2608 bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common
*event
)
2610 switch (event
->priv
->instrumentation
) {
2611 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2613 case LTTNG_KERNEL_ABI_SYSCALL
:
2617 /* Not handled with lazy sync. */
2623 * Should be called with sessions mutex held.
2626 void lttng_sync_event_list(struct list_head
*event_enabler_list
,
2627 struct list_head
*event_list
)
2629 struct lttng_kernel_event_common_private
*event_priv
;
2630 struct lttng_event_enabler_common
*event_enabler
;
2632 list_for_each_entry(event_enabler
, event_enabler_list
, node
)
2633 lttng_event_enabler_ref_events(event_enabler
);
2636 * For each event, if at least one of its enablers is enabled,
2637 * and its channel and session transient states are enabled, we
2638 * enable the event, else we disable it.
2640 list_for_each_entry(event_priv
, event_list
, node
) {
2641 struct lttng_kernel_event_common
*event
= event_priv
->pub
;
2644 if (!lttng_event_is_lazy_sync(event
))
2647 enabled
= lttng_get_event_enabled_state(event
);
2648 WRITE_ONCE(event
->enabled
, enabled
);
2650 * Sync tracepoint registration with event enabled state.
2653 if (!event_priv
->registered
)
2654 register_event(event
);
2656 if (event_priv
->registered
)
2657 unregister_event(event
);
2660 lttng_event_sync_filter_state(event
);
2661 lttng_event_sync_capture_state(event
);
2666 * lttng_session_sync_event_enablers should be called just before starting a
2670 void lttng_session_sync_event_enablers(struct lttng_kernel_session
*session
)
2672 lttng_sync_event_list(&session
->priv
->enablers_head
, &session
->priv
->events
);
2676 * Apply enablers to session events, adding events to session if need
2677 * be. It is required after each modification applied to an active
2678 * session, and right before session "start".
2679 * "lazy" sync means we only sync if required.
2680 * Should be called with sessions mutex held.
2683 void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session
*session
)
2685 /* We can skip if session is not active */
2686 if (!session
->active
)
2688 lttng_session_sync_event_enablers(session
);
2692 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2694 lttng_sync_event_list(&event_notifier_group
->enablers_head
, &event_notifier_group
->event_notifiers_head
);
2698 void lttng_event_enabler_sync(struct lttng_event_enabler_common
*event_enabler
)
2700 switch (event_enabler
->enabler_type
) {
2701 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
2703 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
2704 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
2705 lttng_session_lazy_sync_event_enablers(event_recorder_enabler
->chan
->parent
.session
);
2708 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
2710 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
2711 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
2712 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2721 * Serialize at most one packet worth of metadata into a metadata
2723 * We grab the metadata cache mutex to get exclusive access to our metadata
2724 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2725 * allows us to do racy operations such as looking for remaining space left in
2726 * packet and write, since mutual exclusion protects us from concurrent writes.
2727 * Mutual exclusion on the metadata cache allow us to read the cache content
2728 * without racing against reallocation of the cache by updates.
2729 * Returns the number of bytes written in the channel, 0 if no data
2730 * was written and a negative value on error.
2732 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2733 struct lttng_kernel_ring_buffer_channel
*chan
, bool *coherent
)
2735 struct lttng_kernel_ring_buffer_ctx ctx
;
2737 size_t len
, reserve_len
;
2740 * Ensure we support mutiple get_next / put sequences followed by
2741 * put_next. The metadata cache lock protects reading the metadata
2742 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2743 * "flush" operations on the buffer invoked by different processes.
2744 * Moreover, since the metadata cache memory can be reallocated, we
2745 * need to have exclusive access against updates even though we only
2748 mutex_lock(&stream
->metadata_cache
->lock
);
2749 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2750 if (stream
->metadata_in
!= stream
->metadata_out
)
2753 /* Metadata regenerated, change the version. */
2754 if (stream
->metadata_cache
->version
!= stream
->version
)
2755 stream
->version
= stream
->metadata_cache
->version
;
2757 len
= stream
->metadata_cache
->metadata_written
-
2758 stream
->metadata_in
;
2761 reserve_len
= min_t(size_t,
2762 stream
->transport
->ops
.priv
->packet_avail_size(chan
),
2764 lib_ring_buffer_ctx_init(&ctx
, chan
, reserve_len
,
2765 sizeof(char), NULL
);
2767 * If reservation failed, return an error to the caller.
2769 ret
= stream
->transport
->ops
.event_reserve(&ctx
);
2771 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2772 stream
->coherent
= false;
2775 stream
->transport
->ops
.event_write(&ctx
,
2776 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2778 stream
->transport
->ops
.event_commit(&ctx
);
2779 stream
->metadata_in
+= reserve_len
;
2780 if (reserve_len
< len
)
2781 stream
->coherent
= false;
2783 stream
->coherent
= true;
2788 *coherent
= stream
->coherent
;
2789 mutex_unlock(&stream
->metadata_cache
->lock
);
2794 void lttng_metadata_begin(struct lttng_kernel_session
*session
)
2796 if (atomic_inc_return(&session
->priv
->metadata_cache
->producing
) == 1)
2797 mutex_lock(&session
->priv
->metadata_cache
->lock
);
2801 void lttng_metadata_end(struct lttng_kernel_session
*session
)
2803 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2804 if (atomic_dec_return(&session
->priv
->metadata_cache
->producing
) == 0) {
2805 struct lttng_metadata_stream
*stream
;
2807 list_for_each_entry(stream
, &session
->priv
->metadata_cache
->metadata_stream
, list
)
2808 wake_up_interruptible(&stream
->read_wait
);
2809 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
2814 * Write the metadata to the metadata cache.
2815 * Must be called with sessions_mutex held.
2816 * The metadata cache lock protects us from concurrent read access from
2817 * thread outputting metadata content to ring buffer.
2818 * The content of the printf is printed as a single atomic metadata
2821 int lttng_metadata_printf(struct lttng_kernel_session
*session
,
2822 const char *fmt
, ...)
2828 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2831 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2837 WARN_ON_ONCE(!atomic_read(&session
->priv
->metadata_cache
->producing
));
2838 if (session
->priv
->metadata_cache
->metadata_written
+ len
>
2839 session
->priv
->metadata_cache
->cache_alloc
) {
2840 char *tmp_cache_realloc
;
2841 unsigned int tmp_cache_alloc_size
;
2843 tmp_cache_alloc_size
= max_t(unsigned int,
2844 session
->priv
->metadata_cache
->cache_alloc
+ len
,
2845 session
->priv
->metadata_cache
->cache_alloc
<< 1);
2846 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2847 if (!tmp_cache_realloc
)
2849 if (session
->priv
->metadata_cache
->data
) {
2850 memcpy(tmp_cache_realloc
,
2851 session
->priv
->metadata_cache
->data
,
2852 session
->priv
->metadata_cache
->cache_alloc
);
2853 vfree(session
->priv
->metadata_cache
->data
);
2856 session
->priv
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2857 session
->priv
->metadata_cache
->data
= tmp_cache_realloc
;
2859 memcpy(session
->priv
->metadata_cache
->data
+
2860 session
->priv
->metadata_cache
->metadata_written
,
2862 session
->priv
->metadata_cache
->metadata_written
+= len
;
2873 int print_tabs(struct lttng_kernel_session
*session
, size_t nesting
)
2877 for (i
= 0; i
< nesting
; i
++) {
2880 ret
= lttng_metadata_printf(session
, " ");
2889 int lttng_field_name_statedump(struct lttng_kernel_session
*session
,
2890 const struct lttng_kernel_event_field
*field
,
2893 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2897 int _lttng_integer_type_statedump(struct lttng_kernel_session
*session
,
2898 const struct lttng_kernel_type_integer
*type
,
2899 enum lttng_kernel_string_encoding parent_encoding
,
2904 ret
= print_tabs(session
, nesting
);
2907 ret
= lttng_metadata_printf(session
,
2908 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2912 (parent_encoding
== lttng_kernel_string_encoding_none
)
2914 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
2918 #if __BYTE_ORDER == __BIG_ENDIAN
2919 type
->reverse_byte_order
? " byte_order = le;" : ""
2921 type
->reverse_byte_order
? " byte_order = be;" : ""
2928 * Must be called with sessions_mutex held.
2931 int _lttng_struct_type_statedump(struct lttng_kernel_session
*session
,
2932 const struct lttng_kernel_type_struct
*type
,
2935 const char *prev_field_name
= NULL
;
2937 uint32_t i
, nr_fields
;
2938 unsigned int alignment
;
2940 ret
= print_tabs(session
, nesting
);
2943 ret
= lttng_metadata_printf(session
,
2947 nr_fields
= type
->nr_fields
;
2948 for (i
= 0; i
< nr_fields
; i
++) {
2949 const struct lttng_kernel_event_field
*iter_field
;
2951 iter_field
= type
->fields
[i
];
2952 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, &prev_field_name
);
2956 ret
= print_tabs(session
, nesting
);
2959 alignment
= type
->alignment
;
2961 ret
= lttng_metadata_printf(session
,
2965 ret
= lttng_metadata_printf(session
,
2972 * Must be called with sessions_mutex held.
2975 int _lttng_struct_field_statedump(struct lttng_kernel_session
*session
,
2976 const struct lttng_kernel_event_field
*field
,
2981 ret
= _lttng_struct_type_statedump(session
,
2982 lttng_kernel_get_type_struct(field
->type
), nesting
);
2985 return lttng_field_name_statedump(session
, field
, nesting
);
2989 * Must be called with sessions_mutex held.
2992 int _lttng_variant_type_statedump(struct lttng_kernel_session
*session
,
2993 const struct lttng_kernel_type_variant
*type
,
2995 const char *prev_field_name
)
2997 const char *tag_name
;
2999 uint32_t i
, nr_choices
;
3001 tag_name
= type
->tag_name
;
3003 tag_name
= prev_field_name
;
3007 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3009 if (type
->alignment
!= 0)
3011 ret
= print_tabs(session
, nesting
);
3014 ret
= lttng_metadata_printf(session
,
3015 "variant <_%s> {\n",
3019 nr_choices
= type
->nr_choices
;
3020 for (i
= 0; i
< nr_choices
; i
++) {
3021 const struct lttng_kernel_event_field
*iter_field
;
3023 iter_field
= type
->choices
[i
];
3024 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1, NULL
);
3028 ret
= print_tabs(session
, nesting
);
3031 ret
= lttng_metadata_printf(session
,
3037 * Must be called with sessions_mutex held.
3040 int _lttng_variant_field_statedump(struct lttng_kernel_session
*session
,
3041 const struct lttng_kernel_event_field
*field
,
3043 const char *prev_field_name
)
3047 ret
= _lttng_variant_type_statedump(session
,
3048 lttng_kernel_get_type_variant(field
->type
), nesting
,
3052 return lttng_field_name_statedump(session
, field
, nesting
);
3056 * Must be called with sessions_mutex held.
3059 int _lttng_array_field_statedump(struct lttng_kernel_session
*session
,
3060 const struct lttng_kernel_event_field
*field
,
3064 const struct lttng_kernel_type_array
*array_type
;
3065 const struct lttng_kernel_type_common
*elem_type
;
3067 array_type
= lttng_kernel_get_type_array(field
->type
);
3068 WARN_ON_ONCE(!array_type
);
3070 if (array_type
->alignment
) {
3071 ret
= print_tabs(session
, nesting
);
3074 ret
= lttng_metadata_printf(session
,
3075 "struct { } align(%u) _%s_padding;\n",
3076 array_type
->alignment
* CHAR_BIT
,
3082 * Nested compound types: Only array of structures and variants are
3083 * currently supported.
3085 elem_type
= array_type
->elem_type
;
3086 switch (elem_type
->type
) {
3087 case lttng_kernel_type_integer
:
3088 case lttng_kernel_type_struct
:
3089 case lttng_kernel_type_variant
:
3090 ret
= _lttng_type_statedump(session
, elem_type
,
3091 array_type
->encoding
, nesting
);
3099 ret
= lttng_metadata_printf(session
,
3102 array_type
->length
);
3107 * Must be called with sessions_mutex held.
3110 int _lttng_sequence_field_statedump(struct lttng_kernel_session
*session
,
3111 const struct lttng_kernel_event_field
*field
,
3113 const char *prev_field_name
)
3116 const char *length_name
;
3117 const struct lttng_kernel_type_sequence
*sequence_type
;
3118 const struct lttng_kernel_type_common
*elem_type
;
3120 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3121 WARN_ON_ONCE(!sequence_type
);
3123 length_name
= sequence_type
->length_name
;
3125 length_name
= prev_field_name
;
3129 if (sequence_type
->alignment
) {
3130 ret
= print_tabs(session
, nesting
);
3133 ret
= lttng_metadata_printf(session
,
3134 "struct { } align(%u) _%s_padding;\n",
3135 sequence_type
->alignment
* CHAR_BIT
,
3142 * Nested compound types: Only array of structures and variants are
3143 * currently supported.
3145 elem_type
= sequence_type
->elem_type
;
3146 switch (elem_type
->type
) {
3147 case lttng_kernel_type_integer
:
3148 case lttng_kernel_type_struct
:
3149 case lttng_kernel_type_variant
:
3150 ret
= _lttng_type_statedump(session
, elem_type
,
3151 sequence_type
->encoding
, nesting
);
3159 ret
= lttng_metadata_printf(session
,
3167 * Must be called with sessions_mutex held.
3170 int _lttng_enum_type_statedump(struct lttng_kernel_session
*session
,
3171 const struct lttng_kernel_type_enum
*type
,
3174 const struct lttng_kernel_enum_desc
*enum_desc
;
3175 const struct lttng_kernel_type_common
*container_type
;
3177 unsigned int i
, nr_entries
;
3179 container_type
= type
->container_type
;
3180 if (container_type
->type
!= lttng_kernel_type_integer
) {
3184 enum_desc
= type
->desc
;
3185 nr_entries
= enum_desc
->nr_entries
;
3187 ret
= print_tabs(session
, nesting
);
3190 ret
= lttng_metadata_printf(session
, "enum : ");
3193 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3194 lttng_kernel_string_encoding_none
, 0);
3197 ret
= lttng_metadata_printf(session
, " {\n");
3200 /* Dump all entries */
3201 for (i
= 0; i
< nr_entries
; i
++) {
3202 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3205 ret
= print_tabs(session
, nesting
+ 1);
3208 ret
= lttng_metadata_printf(session
,
3212 len
= strlen(entry
->string
);
3213 /* Escape the character '"' */
3214 for (j
= 0; j
< len
; j
++) {
3215 char c
= entry
->string
[j
];
3219 ret
= lttng_metadata_printf(session
,
3223 ret
= lttng_metadata_printf(session
,
3227 ret
= lttng_metadata_printf(session
,
3234 ret
= lttng_metadata_printf(session
, "\"");
3238 if (entry
->options
.is_auto
) {
3239 ret
= lttng_metadata_printf(session
, ",\n");
3243 ret
= lttng_metadata_printf(session
,
3247 if (entry
->start
.signedness
)
3248 ret
= lttng_metadata_printf(session
,
3249 "%lld", (long long) entry
->start
.value
);
3251 ret
= lttng_metadata_printf(session
,
3252 "%llu", entry
->start
.value
);
3255 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3257 == entry
->end
.value
) {
3258 ret
= lttng_metadata_printf(session
,
3261 if (entry
->end
.signedness
) {
3262 ret
= lttng_metadata_printf(session
,
3264 (long long) entry
->end
.value
);
3266 ret
= lttng_metadata_printf(session
,
3275 ret
= print_tabs(session
, nesting
);
3278 ret
= lttng_metadata_printf(session
, "}");
3284 * Must be called with sessions_mutex held.
3287 int _lttng_enum_field_statedump(struct lttng_kernel_session
*session
,
3288 const struct lttng_kernel_event_field
*field
,
3292 const struct lttng_kernel_type_enum
*enum_type
;
3294 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3295 WARN_ON_ONCE(!enum_type
);
3296 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3299 return lttng_field_name_statedump(session
, field
, nesting
);
3303 int _lttng_integer_field_statedump(struct lttng_kernel_session
*session
,
3304 const struct lttng_kernel_event_field
*field
,
3309 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3310 lttng_kernel_string_encoding_none
, nesting
);
3313 return lttng_field_name_statedump(session
, field
, nesting
);
3317 int _lttng_string_type_statedump(struct lttng_kernel_session
*session
,
3318 const struct lttng_kernel_type_string
*type
,
3323 /* Default encoding is UTF8 */
3324 ret
= print_tabs(session
, nesting
);
3327 ret
= lttng_metadata_printf(session
,
3329 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3330 " { encoding = ASCII; }" : "");
3335 int _lttng_string_field_statedump(struct lttng_kernel_session
*session
,
3336 const struct lttng_kernel_event_field
*field
,
3339 const struct lttng_kernel_type_string
*string_type
;
3342 string_type
= lttng_kernel_get_type_string(field
->type
);
3343 WARN_ON_ONCE(!string_type
);
3344 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3347 return lttng_field_name_statedump(session
, field
, nesting
);
3351 * Must be called with sessions_mutex held.
3354 int _lttng_type_statedump(struct lttng_kernel_session
*session
,
3355 const struct lttng_kernel_type_common
*type
,
3356 enum lttng_kernel_string_encoding parent_encoding
,
3361 switch (type
->type
) {
3362 case lttng_kernel_type_integer
:
3363 ret
= _lttng_integer_type_statedump(session
,
3364 lttng_kernel_get_type_integer(type
),
3365 parent_encoding
, nesting
);
3367 case lttng_kernel_type_enum
:
3368 ret
= _lttng_enum_type_statedump(session
,
3369 lttng_kernel_get_type_enum(type
),
3372 case lttng_kernel_type_string
:
3373 ret
= _lttng_string_type_statedump(session
,
3374 lttng_kernel_get_type_string(type
),
3377 case lttng_kernel_type_struct
:
3378 ret
= _lttng_struct_type_statedump(session
,
3379 lttng_kernel_get_type_struct(type
),
3382 case lttng_kernel_type_variant
:
3383 ret
= _lttng_variant_type_statedump(session
,
3384 lttng_kernel_get_type_variant(type
),
3388 /* Nested arrays and sequences are not supported yet. */
3389 case lttng_kernel_type_array
:
3390 case lttng_kernel_type_sequence
:
3399 * Must be called with sessions_mutex held.
3402 int _lttng_field_statedump(struct lttng_kernel_session
*session
,
3403 const struct lttng_kernel_event_field
*field
,
3405 const char **prev_field_name_p
)
3407 const char *prev_field_name
= NULL
;
3410 if (prev_field_name_p
)
3411 prev_field_name
= *prev_field_name_p
;
3412 switch (field
->type
->type
) {
3413 case lttng_kernel_type_integer
:
3414 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3416 case lttng_kernel_type_enum
:
3417 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3419 case lttng_kernel_type_string
:
3420 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3422 case lttng_kernel_type_struct
:
3423 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3425 case lttng_kernel_type_array
:
3426 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3428 case lttng_kernel_type_sequence
:
3429 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
, prev_field_name
);
3431 case lttng_kernel_type_variant
:
3432 ret
= _lttng_variant_field_statedump(session
, field
, nesting
, prev_field_name
);
3439 if (prev_field_name_p
)
3440 *prev_field_name_p
= field
->name
;
3445 int _lttng_context_metadata_statedump(struct lttng_kernel_session
*session
,
3446 struct lttng_kernel_ctx
*ctx
)
3448 const char *prev_field_name
= NULL
;
3454 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3455 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3457 ret
= _lttng_field_statedump(session
, field
->event_field
, 2, &prev_field_name
);
3465 int _lttng_fields_metadata_statedump(struct lttng_kernel_session
*session
,
3466 struct lttng_kernel_event_recorder
*event_recorder
)
3468 const char *prev_field_name
= NULL
;
3469 const struct lttng_kernel_event_desc
*desc
= event_recorder
->priv
->parent
.desc
;
3473 for (i
= 0; i
< desc
->tp_class
->nr_fields
; i
++) {
3474 const struct lttng_kernel_event_field
*field
= desc
->tp_class
->fields
[i
];
3476 ret
= _lttng_field_statedump(session
, field
, 2, &prev_field_name
);
3484 * Must be called with sessions_mutex held.
3485 * The entire event metadata is printed as a single atomic metadata
3489 int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common
*event
)
3491 struct lttng_kernel_event_recorder
*event_recorder
;
3492 struct lttng_kernel_channel_buffer
*chan
;
3493 struct lttng_kernel_session
*session
;
3496 if (event
->type
!= LTTNG_KERNEL_EVENT_TYPE_RECORDER
)
3498 event_recorder
= container_of(event
, struct lttng_kernel_event_recorder
, parent
);
3499 chan
= event_recorder
->chan
;
3500 session
= chan
->parent
.session
;
3502 if (event_recorder
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3504 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3507 lttng_metadata_begin(session
);
3509 ret
= lttng_metadata_printf(session
,
3513 " stream_id = %u;\n",
3514 event_recorder
->priv
->parent
.desc
->event_name
,
3515 event_recorder
->priv
->id
,
3516 event_recorder
->chan
->priv
->id
);
3520 ret
= lttng_metadata_printf(session
,
3521 " fields := struct {\n"
3526 ret
= _lttng_fields_metadata_statedump(session
, event_recorder
);
3531 * LTTng space reservation can only reserve multiples of the
3534 ret
= lttng_metadata_printf(session
,
3540 event_recorder
->priv
->metadata_dumped
= 1;
3542 lttng_metadata_end(session
);
3548 * Must be called with sessions_mutex held.
3549 * The entire channel metadata is printed as a single atomic metadata
3553 int _lttng_channel_metadata_statedump(struct lttng_kernel_session
*session
,
3554 struct lttng_kernel_channel_buffer
*chan
)
3558 if (chan
->priv
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3561 if (chan
->priv
->channel_type
== METADATA_CHANNEL
)
3564 lttng_metadata_begin(session
);
3566 WARN_ON_ONCE(!chan
->priv
->header_type
);
3567 ret
= lttng_metadata_printf(session
,
3570 " event.header := %s;\n"
3571 " packet.context := struct packet_context;\n",
3573 chan
->priv
->header_type
== 1 ? "struct event_header_compact" :
3574 "struct event_header_large");
3578 if (chan
->priv
->ctx
) {
3579 ret
= lttng_metadata_printf(session
,
3580 " event.context := struct {\n");
3584 ret
= _lttng_context_metadata_statedump(session
, chan
->priv
->ctx
);
3587 if (chan
->priv
->ctx
) {
3588 ret
= lttng_metadata_printf(session
,
3594 ret
= lttng_metadata_printf(session
,
3597 chan
->priv
->metadata_dumped
= 1;
3599 lttng_metadata_end(session
);
3604 * Must be called with sessions_mutex held.
3607 int _lttng_stream_packet_context_declare(struct lttng_kernel_session
*session
)
3609 return lttng_metadata_printf(session
,
3610 "struct packet_context {\n"
3611 " uint64_clock_monotonic_t timestamp_begin;\n"
3612 " uint64_clock_monotonic_t timestamp_end;\n"
3613 " uint64_t content_size;\n"
3614 " uint64_t packet_size;\n"
3615 " uint64_t packet_seq_num;\n"
3616 " unsigned long events_discarded;\n"
3617 " uint32_t cpu_id;\n"
3624 * id: range: 0 - 30.
3625 * id 31 is reserved to indicate an extended header.
3628 * id: range: 0 - 65534.
3629 * id 65535 is reserved to indicate an extended header.
3631 * Must be called with sessions_mutex held.
3634 int _lttng_event_header_declare(struct lttng_kernel_session
*session
)
3636 return lttng_metadata_printf(session
,
3637 "struct event_header_compact {\n"
3638 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3641 " uint27_clock_monotonic_t timestamp;\n"
3645 " uint64_clock_monotonic_t timestamp;\n"
3650 "struct event_header_large {\n"
3651 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3654 " uint32_clock_monotonic_t timestamp;\n"
3658 " uint64_clock_monotonic_t timestamp;\n"
3662 lttng_alignof(uint32_t) * CHAR_BIT
,
3663 lttng_alignof(uint16_t) * CHAR_BIT
3668 * Approximation of NTP time of day to clock monotonic correlation,
3669 * taken at start of trace.
3670 * Yes, this is only an approximation. Yes, we can (and will) do better
3671 * in future versions.
3672 * This function may return a negative offset. It may happen if the
3673 * system sets the REALTIME clock to 0 after boot.
3675 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3679 int64_t measure_clock_offset(void)
3681 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3682 uint64_t tcf
= trace_clock_freq();
3684 unsigned long flags
;
3685 struct timespec64 rts
= { 0, 0 };
3687 /* Disable interrupts to increase correlation precision. */
3688 local_irq_save(flags
);
3689 monotonic
[0] = trace_clock_read64();
3690 ktime_get_real_ts64(&rts
);
3691 monotonic
[1] = trace_clock_read64();
3692 local_irq_restore(flags
);
3694 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3695 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3696 if (tcf
== NSEC_PER_SEC
) {
3697 realtime
+= rts
.tv_nsec
;
3699 uint64_t n
= rts
.tv_nsec
* tcf
;
3701 do_div(n
, NSEC_PER_SEC
);
3704 offset
= (int64_t) realtime
- monotonic_avg
;
3709 int print_escaped_ctf_string(struct lttng_kernel_session
*session
, const char *string
)
3717 while (cur
!= '\0') {
3720 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3724 ret
= lttng_metadata_printf(session
, "%c", '\\');
3727 /* We still print the current char */
3730 ret
= lttng_metadata_printf(session
, "%c", cur
);
3744 int print_metadata_escaped_field(struct lttng_kernel_session
*session
, const char *field
,
3745 const char *field_value
)
3749 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3753 ret
= print_escaped_ctf_string(session
, field_value
);
3757 ret
= lttng_metadata_printf(session
, "\";\n");
3764 * Output metadata into this session's metadata buffers.
3765 * Must be called with sessions_mutex held.
3768 int _lttng_session_metadata_statedump(struct lttng_kernel_session
*session
)
3770 unsigned char *uuid_c
= session
->priv
->uuid
.b
;
3771 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3772 const char *product_uuid
;
3773 struct lttng_kernel_channel_buffer_private
*chan_priv
;
3774 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
3777 if (!LTTNG_READ_ONCE(session
->active
))
3780 lttng_metadata_begin(session
);
3782 if (session
->priv
->metadata_dumped
)
3785 snprintf(uuid_s
, sizeof(uuid_s
),
3786 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3787 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3788 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3789 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3790 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3792 ret
= lttng_metadata_printf(session
,
3793 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3794 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3795 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3796 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3797 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3798 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3799 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3805 " byte_order = %s;\n"
3806 " packet.header := struct {\n"
3807 " uint32_t magic;\n"
3808 " uint8_t uuid[16];\n"
3809 " uint32_t stream_id;\n"
3810 " uint64_t stream_instance_id;\n"
3813 lttng_alignof(uint8_t) * CHAR_BIT
,
3814 lttng_alignof(uint16_t) * CHAR_BIT
,
3815 lttng_alignof(uint32_t) * CHAR_BIT
,
3816 lttng_alignof(uint64_t) * CHAR_BIT
,
3817 sizeof(unsigned long) * CHAR_BIT
,
3818 lttng_alignof(unsigned long) * CHAR_BIT
,
3822 #if __BYTE_ORDER == __BIG_ENDIAN
3831 ret
= lttng_metadata_printf(session
,
3833 " hostname = \"%s\";\n"
3834 " domain = \"kernel\";\n"
3835 " sysname = \"%s\";\n"
3836 " kernel_release = \"%s\";\n"
3837 " kernel_version = \"%s\";\n"
3838 " tracer_name = \"lttng-modules\";\n"
3839 " tracer_major = %d;\n"
3840 " tracer_minor = %d;\n"
3841 " tracer_patchlevel = %d;\n"
3842 " trace_buffering_scheme = \"global\";\n",
3843 current
->nsproxy
->uts_ns
->name
.nodename
,
3847 LTTNG_MODULES_MAJOR_VERSION
,
3848 LTTNG_MODULES_MINOR_VERSION
,
3849 LTTNG_MODULES_PATCHLEVEL_VERSION
3854 ret
= print_metadata_escaped_field(session
, "trace_name", session
->priv
->name
);
3857 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3858 session
->priv
->creation_time
);
3862 /* Add the product UUID to the 'env' section */
3863 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3865 ret
= lttng_metadata_printf(session
,
3866 " product_uuid = \"%s\";\n",
3873 /* Close the 'env' section */
3874 ret
= lttng_metadata_printf(session
, "};\n\n");
3878 ret
= lttng_metadata_printf(session
,
3880 " name = \"%s\";\n",
3886 if (!trace_clock_uuid(clock_uuid_s
)) {
3887 ret
= lttng_metadata_printf(session
,
3888 " uuid = \"%s\";\n",
3895 ret
= lttng_metadata_printf(session
,
3896 " description = \"%s\";\n"
3897 " freq = %llu; /* Frequency, in Hz */\n"
3898 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3901 trace_clock_description(),
3902 (unsigned long long) trace_clock_freq(),
3903 (long long) measure_clock_offset()
3908 ret
= lttng_metadata_printf(session
,
3909 "typealias integer {\n"
3910 " size = 27; align = 1; signed = false;\n"
3911 " map = clock.%s.value;\n"
3912 "} := uint27_clock_monotonic_t;\n"
3914 "typealias integer {\n"
3915 " size = 32; align = %u; signed = false;\n"
3916 " map = clock.%s.value;\n"
3917 "} := uint32_clock_monotonic_t;\n"
3919 "typealias integer {\n"
3920 " size = 64; align = %u; signed = false;\n"
3921 " map = clock.%s.value;\n"
3922 "} := uint64_clock_monotonic_t;\n\n",
3924 lttng_alignof(uint32_t) * CHAR_BIT
,
3926 lttng_alignof(uint64_t) * CHAR_BIT
,
3932 ret
= _lttng_stream_packet_context_declare(session
);
3936 ret
= _lttng_event_header_declare(session
);
3941 list_for_each_entry(chan_priv
, &session
->priv
->chan
, node
) {
3942 ret
= _lttng_channel_metadata_statedump(session
, chan_priv
->pub
);
3947 list_for_each_entry(event_recorder_priv
, &session
->priv
->events
, parent
.node
) {
3948 ret
= _lttng_event_recorder_metadata_statedump(&event_recorder_priv
->pub
->parent
);
3952 session
->priv
->metadata_dumped
= 1;
3954 lttng_metadata_end(session
);
3959 * lttng_transport_register - LTT transport registration
3960 * @transport: transport structure
3962 * Registers a transport which can be used as output to extract the data out of
3963 * LTTng. The module calling this registration function must ensure that no
3964 * trap-inducing code will be executed by the transport functions. E.g.
3965 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3966 * is made visible to the transport function. This registration acts as a
3967 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3968 * after its registration must it synchronize the TLBs.
3970 void lttng_transport_register(struct lttng_transport
*transport
)
3973 * Make sure no page fault can be triggered by the module about to be
3974 * registered. We deal with this here so we don't have to call
3975 * vmalloc_sync_mappings() in each module's init.
3977 wrapper_vmalloc_sync_mappings();
3979 mutex_lock(&sessions_mutex
);
3980 list_add_tail(&transport
->node
, <tng_transport_list
);
3981 mutex_unlock(&sessions_mutex
);
3983 EXPORT_SYMBOL_GPL(lttng_transport_register
);
3986 * lttng_transport_unregister - LTT transport unregistration
3987 * @transport: transport structure
3989 void lttng_transport_unregister(struct lttng_transport
*transport
)
3991 mutex_lock(&sessions_mutex
);
3992 list_del(&transport
->node
);
3993 mutex_unlock(&sessions_mutex
);
3995 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
3997 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4000 * Make sure no page fault can be triggered by the module about to be
4001 * registered. We deal with this here so we don't have to call
4002 * vmalloc_sync_mappings() in each module's init.
4004 wrapper_vmalloc_sync_mappings();
4006 mutex_lock(&sessions_mutex
);
4007 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4008 mutex_unlock(&sessions_mutex
);
4010 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4012 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4014 mutex_lock(&sessions_mutex
);
4015 list_del(&transport
->node
);
4016 mutex_unlock(&sessions_mutex
);
4018 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4020 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4022 enum cpuhp_state lttng_hp_prepare
;
4023 enum cpuhp_state lttng_hp_online
;
4025 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4027 struct lttng_cpuhp_node
*lttng_node
;
4029 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4030 switch (lttng_node
->component
) {
4031 case LTTNG_RING_BUFFER_FRONTEND
:
4033 case LTTNG_RING_BUFFER_BACKEND
:
4034 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4035 case LTTNG_RING_BUFFER_ITER
:
4037 case LTTNG_CONTEXT_PERF_COUNTERS
:
4044 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4046 struct lttng_cpuhp_node
*lttng_node
;
4048 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4049 switch (lttng_node
->component
) {
4050 case LTTNG_RING_BUFFER_FRONTEND
:
4051 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4052 case LTTNG_RING_BUFFER_BACKEND
:
4054 case LTTNG_RING_BUFFER_ITER
:
4056 case LTTNG_CONTEXT_PERF_COUNTERS
:
4057 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4063 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4065 struct lttng_cpuhp_node
*lttng_node
;
4067 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4068 switch (lttng_node
->component
) {
4069 case LTTNG_RING_BUFFER_FRONTEND
:
4070 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4071 case LTTNG_RING_BUFFER_BACKEND
:
4073 case LTTNG_RING_BUFFER_ITER
:
4074 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4075 case LTTNG_CONTEXT_PERF_COUNTERS
:
4076 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4082 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4084 struct lttng_cpuhp_node
*lttng_node
;
4086 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4087 switch (lttng_node
->component
) {
4088 case LTTNG_RING_BUFFER_FRONTEND
:
4089 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4090 case LTTNG_RING_BUFFER_BACKEND
:
4092 case LTTNG_RING_BUFFER_ITER
:
4094 case LTTNG_CONTEXT_PERF_COUNTERS
:
4101 static int __init
lttng_init_cpu_hotplug(void)
4105 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4106 lttng_hotplug_prepare
,
4107 lttng_hotplug_dead
);
4111 lttng_hp_prepare
= ret
;
4112 lttng_rb_set_hp_prepare(ret
);
4114 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4115 lttng_hotplug_online
,
4116 lttng_hotplug_offline
);
4118 cpuhp_remove_multi_state(lttng_hp_prepare
);
4119 lttng_hp_prepare
= 0;
4122 lttng_hp_online
= ret
;
4123 lttng_rb_set_hp_online(ret
);
4128 static void __exit
lttng_exit_cpu_hotplug(void)
4130 lttng_rb_set_hp_online(0);
4131 cpuhp_remove_multi_state(lttng_hp_online
);
4132 lttng_rb_set_hp_prepare(0);
4133 cpuhp_remove_multi_state(lttng_hp_prepare
);
4136 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4137 static int lttng_init_cpu_hotplug(void)
4141 static void lttng_exit_cpu_hotplug(void)
4144 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4146 static int __init
lttng_events_init(void)
4150 ret
= wrapper_get_pfnblock_flags_mask_init();
4153 ret
= wrapper_task_prio_init();
4156 ret
= lttng_probes_init();
4159 ret
= lttng_context_init();
4162 ret
= lttng_tracepoint_init();
4165 event_recorder_cache
= KMEM_CACHE(lttng_kernel_event_recorder
, 0);
4166 if (!event_recorder_cache
) {
4168 goto error_kmem_event_recorder
;
4170 event_recorder_private_cache
= KMEM_CACHE(lttng_kernel_event_recorder_private
, 0);
4171 if (!event_recorder_private_cache
) {
4173 goto error_kmem_event_recorder_private
;
4175 event_notifier_cache
= KMEM_CACHE(lttng_kernel_event_notifier
, 0);
4176 if (!event_notifier_cache
) {
4178 goto error_kmem_event_notifier
;
4180 event_notifier_private_cache
= KMEM_CACHE(lttng_kernel_event_notifier_private
, 0);
4181 if (!event_notifier_private_cache
) {
4183 goto error_kmem_event_notifier_private
;
4185 ret
= lttng_abi_init();
4188 ret
= lttng_logger_init();
4191 ret
= lttng_init_cpu_hotplug();
4194 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4195 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4196 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4197 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4198 LTTNG_MODULES_EXTRAVERSION
,
4200 #ifdef LTTNG_EXTRA_VERSION_GIT
4201 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4205 #ifdef LTTNG_EXTRA_VERSION_NAME
4206 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4210 #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM
4211 printk(KERN_NOTICE
"LTTng: Experimental bitwise enum enabled.\n");
4212 #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */
4216 lttng_logger_exit();
4220 kmem_cache_destroy(event_notifier_private_cache
);
4221 error_kmem_event_notifier_private
:
4222 kmem_cache_destroy(event_notifier_cache
);
4223 error_kmem_event_notifier
:
4224 kmem_cache_destroy(event_recorder_private_cache
);
4225 error_kmem_event_recorder_private
:
4226 kmem_cache_destroy(event_recorder_cache
);
4227 error_kmem_event_recorder
:
4228 lttng_tracepoint_exit();
4230 lttng_context_exit();
4231 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4232 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4233 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4234 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4235 LTTNG_MODULES_EXTRAVERSION
,
4237 #ifdef LTTNG_EXTRA_VERSION_GIT
4238 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4242 #ifdef LTTNG_EXTRA_VERSION_NAME
4243 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4250 module_init(lttng_events_init
);
4252 static void __exit
lttng_events_exit(void)
4254 struct lttng_kernel_session_private
*session_priv
, *tmpsession_priv
;
4256 lttng_exit_cpu_hotplug();
4257 lttng_logger_exit();
4259 list_for_each_entry_safe(session_priv
, tmpsession_priv
, &sessions
, list
)
4260 lttng_session_destroy(session_priv
->pub
);
4261 kmem_cache_destroy(event_recorder_cache
);
4262 kmem_cache_destroy(event_recorder_private_cache
);
4263 kmem_cache_destroy(event_notifier_cache
);
4264 kmem_cache_destroy(event_notifier_private_cache
);
4265 lttng_tracepoint_exit();
4266 lttng_context_exit();
4267 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4268 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4269 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4270 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4271 LTTNG_MODULES_EXTRAVERSION
,
4273 #ifdef LTTNG_EXTRA_VERSION_GIT
4274 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4278 #ifdef LTTNG_EXTRA_VERSION_NAME
4279 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4285 module_exit(lttng_events_exit
);
4287 #include <generated/patches.h>
4288 #ifdef LTTNG_EXTRA_VERSION_GIT
4289 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4291 #ifdef LTTNG_EXTRA_VERSION_NAME
4292 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4294 MODULE_LICENSE("GPL and additional rights");
4295 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4296 MODULE_DESCRIPTION("LTTng tracer");
4297 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4298 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4299 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4300 LTTNG_MODULES_EXTRAVERSION
);