1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Holds LTTng per-session event registry.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
14 #include "wrapper/page_alloc.h"
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
31 #include <wrapper/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>
49 #include <wrapper/time.h>
51 #define METADATA_CACHE_DEFAULT_SIZE 4096
53 static LIST_HEAD(sessions
);
54 static LIST_HEAD(event_notifier_groups
);
55 static LIST_HEAD(lttng_transport_list
);
56 static LIST_HEAD(lttng_counter_transport_list
);
58 * Protect the sessions and metadata caches.
60 static DEFINE_MUTEX(sessions_mutex
);
61 static struct kmem_cache
*event_cache
;
62 static struct kmem_cache
*event_notifier_cache
;
64 static void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
65 static void lttng_session_sync_event_enablers(struct lttng_session
*session
);
66 static void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
);
67 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
);
68 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
);
70 static void _lttng_event_destroy(struct lttng_event
*event
);
71 static void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
);
72 static void _lttng_channel_destroy(struct lttng_channel
*chan
);
73 static int _lttng_event_unregister(struct lttng_event
*event
);
74 static int _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
);
76 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
77 struct lttng_channel
*chan
,
78 struct lttng_event
*event
);
80 int _lttng_session_metadata_statedump(struct lttng_session
*session
);
82 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
);
84 int _lttng_type_statedump(struct lttng_session
*session
,
85 const struct lttng_kernel_type_common
*type
,
86 enum lttng_kernel_string_encoding parent_encoding
,
89 int _lttng_field_statedump(struct lttng_session
*session
,
90 const struct lttng_kernel_event_field
*field
,
93 void synchronize_trace(void)
95 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
101 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
102 #ifdef CONFIG_PREEMPT_RT_FULL
105 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
106 #ifdef CONFIG_PREEMPT_RT
109 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
112 void lttng_lock_sessions(void)
114 mutex_lock(&sessions_mutex
);
117 void lttng_unlock_sessions(void)
119 mutex_unlock(&sessions_mutex
);
122 static struct lttng_transport
*lttng_transport_find(const char *name
)
124 struct lttng_transport
*transport
;
126 list_for_each_entry(transport
, <tng_transport_list
, node
) {
127 if (!strcmp(transport
->name
, name
))
134 * Called with sessions lock held.
136 int lttng_session_active(void)
138 struct lttng_session
*iter
;
140 list_for_each_entry(iter
, &sessions
, list
) {
147 struct lttng_session
*lttng_session_create(void)
149 struct lttng_session
*session
;
150 struct lttng_metadata_cache
*metadata_cache
;
153 mutex_lock(&sessions_mutex
);
154 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
157 INIT_LIST_HEAD(&session
->chan
);
158 INIT_LIST_HEAD(&session
->events
);
159 lttng_guid_gen(&session
->uuid
);
161 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
164 goto err_free_session
;
165 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
166 if (!metadata_cache
->data
)
168 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
169 kref_init(&metadata_cache
->refcount
);
170 mutex_init(&metadata_cache
->lock
);
171 session
->metadata_cache
= metadata_cache
;
172 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
173 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
174 sizeof(metadata_cache
->uuid
));
175 INIT_LIST_HEAD(&session
->enablers_head
);
176 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
177 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
178 list_add(&session
->list
, &sessions
);
179 session
->pid_tracker
.session
= session
;
180 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
181 session
->vpid_tracker
.session
= session
;
182 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
183 session
->uid_tracker
.session
= session
;
184 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
185 session
->vuid_tracker
.session
= session
;
186 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
187 session
->gid_tracker
.session
= session
;
188 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
189 session
->vgid_tracker
.session
= session
;
190 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
191 mutex_unlock(&sessions_mutex
);
195 kfree(metadata_cache
);
197 lttng_kvfree(session
);
199 mutex_unlock(&sessions_mutex
);
204 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
206 struct lttng_counter_transport
*transport
;
208 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
209 if (!strcmp(transport
->name
, name
))
215 struct lttng_counter
*lttng_kernel_counter_create(
216 const char *counter_transport_name
,
217 size_t number_dimensions
, const size_t *dimensions_sizes
)
219 struct lttng_counter
*counter
= NULL
;
220 struct lttng_counter_transport
*counter_transport
= NULL
;
222 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
223 if (!counter_transport
) {
224 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
225 counter_transport_name
);
228 if (!try_module_get(counter_transport
->owner
)) {
229 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
233 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
237 /* Create event notifier error counter. */
238 counter
->ops
= &counter_transport
->ops
;
239 counter
->transport
= counter_transport
;
241 counter
->counter
= counter
->ops
->counter_create(
242 number_dimensions
, dimensions_sizes
, 0);
243 if (!counter
->counter
) {
250 lttng_kvfree(counter
);
252 if (counter_transport
)
253 module_put(counter_transport
->owner
);
258 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
260 struct lttng_transport
*transport
= NULL
;
261 struct lttng_event_notifier_group
*event_notifier_group
;
262 const char *transport_name
= "relay-event-notifier";
263 size_t subbuf_size
= 4096; //TODO
264 size_t num_subbuf
= 16; //TODO
265 unsigned int switch_timer_interval
= 0;
266 unsigned int read_timer_interval
= 0;
269 mutex_lock(&sessions_mutex
);
271 transport
= lttng_transport_find(transport_name
);
273 printk(KERN_WARNING
"LTTng: transport %s not found\n",
277 if (!try_module_get(transport
->owner
)) {
278 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
283 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
285 if (!event_notifier_group
)
289 * Initialize the ring buffer used to store event notifier
292 event_notifier_group
->ops
= &transport
->ops
;
293 event_notifier_group
->chan
= transport
->ops
.channel_create(
294 transport_name
, event_notifier_group
, NULL
,
295 subbuf_size
, num_subbuf
, switch_timer_interval
,
296 read_timer_interval
);
297 if (!event_notifier_group
->chan
)
300 event_notifier_group
->transport
= transport
;
302 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
303 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
304 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
305 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
307 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
309 mutex_unlock(&sessions_mutex
);
311 return event_notifier_group
;
314 lttng_kvfree(event_notifier_group
);
317 module_put(transport
->owner
);
319 mutex_unlock(&sessions_mutex
);
323 void metadata_cache_destroy(struct kref
*kref
)
325 struct lttng_metadata_cache
*cache
=
326 container_of(kref
, struct lttng_metadata_cache
, refcount
);
331 void lttng_session_destroy(struct lttng_session
*session
)
333 struct lttng_channel
*chan
, *tmpchan
;
334 struct lttng_event
*event
, *tmpevent
;
335 struct lttng_metadata_stream
*metadata_stream
;
336 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
339 mutex_lock(&sessions_mutex
);
340 WRITE_ONCE(session
->active
, 0);
341 list_for_each_entry(chan
, &session
->chan
, list
) {
342 ret
= lttng_syscalls_unregister_channel(chan
);
345 list_for_each_entry(event
, &session
->events
, list
) {
346 ret
= _lttng_event_unregister(event
);
349 synchronize_trace(); /* Wait for in-flight events to complete */
350 list_for_each_entry(chan
, &session
->chan
, list
) {
351 ret
= lttng_syscalls_destroy_event(chan
);
354 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
355 &session
->enablers_head
, node
)
356 lttng_event_enabler_destroy(event_enabler
);
357 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
358 _lttng_event_destroy(event
);
359 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
360 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
361 _lttng_channel_destroy(chan
);
363 mutex_lock(&session
->metadata_cache
->lock
);
364 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
365 _lttng_metadata_channel_hangup(metadata_stream
);
366 mutex_unlock(&session
->metadata_cache
->lock
);
367 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
368 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
369 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
370 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
371 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
372 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
373 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
374 list_del(&session
->list
);
375 mutex_unlock(&sessions_mutex
);
376 lttng_kvfree(session
);
379 void lttng_event_notifier_group_destroy(
380 struct lttng_event_notifier_group
*event_notifier_group
)
382 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
383 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
386 if (!event_notifier_group
)
389 mutex_lock(&sessions_mutex
);
391 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
394 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
395 &event_notifier_group
->event_notifiers_head
, list
) {
396 ret
= _lttng_event_notifier_unregister(event_notifier
);
400 /* Wait for in-flight event notifier to complete */
403 irq_work_sync(&event_notifier_group
->wakeup_pending
);
405 kfree(event_notifier_group
->sc_filter
);
407 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
408 &event_notifier_group
->enablers_head
, node
)
409 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
411 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
412 &event_notifier_group
->event_notifiers_head
, list
)
413 _lttng_event_notifier_destroy(event_notifier
);
415 if (event_notifier_group
->error_counter
) {
416 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
418 error_counter
->ops
->counter_destroy(error_counter
->counter
);
419 module_put(error_counter
->transport
->owner
);
420 lttng_kvfree(error_counter
);
421 event_notifier_group
->error_counter
= NULL
;
424 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
425 module_put(event_notifier_group
->transport
->owner
);
426 list_del(&event_notifier_group
->node
);
428 mutex_unlock(&sessions_mutex
);
429 lttng_kvfree(event_notifier_group
);
432 int lttng_session_statedump(struct lttng_session
*session
)
436 mutex_lock(&sessions_mutex
);
437 ret
= lttng_statedump_start(session
);
438 mutex_unlock(&sessions_mutex
);
442 int lttng_session_enable(struct lttng_session
*session
)
445 struct lttng_channel
*chan
;
447 mutex_lock(&sessions_mutex
);
448 if (session
->active
) {
453 /* Set transient enabler state to "enabled" */
456 /* We need to sync enablers with session before activation. */
457 lttng_session_sync_event_enablers(session
);
460 * Snapshot the number of events per channel to know the type of header
463 list_for_each_entry(chan
, &session
->chan
, list
) {
464 if (chan
->header_type
)
465 continue; /* don't change it if session stop/restart */
466 if (chan
->free_event_id
< 31)
467 chan
->header_type
= 1; /* compact */
469 chan
->header_type
= 2; /* large */
472 /* Clear each stream's quiescent state. */
473 list_for_each_entry(chan
, &session
->chan
, list
) {
474 if (chan
->channel_type
!= METADATA_CHANNEL
)
475 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
478 WRITE_ONCE(session
->active
, 1);
479 WRITE_ONCE(session
->been_active
, 1);
480 ret
= _lttng_session_metadata_statedump(session
);
482 WRITE_ONCE(session
->active
, 0);
485 ret
= lttng_statedump_start(session
);
487 WRITE_ONCE(session
->active
, 0);
489 mutex_unlock(&sessions_mutex
);
493 int lttng_session_disable(struct lttng_session
*session
)
496 struct lttng_channel
*chan
;
498 mutex_lock(&sessions_mutex
);
499 if (!session
->active
) {
503 WRITE_ONCE(session
->active
, 0);
505 /* Set transient enabler state to "disabled" */
507 lttng_session_sync_event_enablers(session
);
509 /* Set each stream's quiescent state. */
510 list_for_each_entry(chan
, &session
->chan
, list
) {
511 if (chan
->channel_type
!= METADATA_CHANNEL
)
512 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
515 mutex_unlock(&sessions_mutex
);
519 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
522 struct lttng_channel
*chan
;
523 struct lttng_event
*event
;
524 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
525 struct lttng_metadata_stream
*stream
;
527 mutex_lock(&sessions_mutex
);
528 if (!session
->active
) {
533 mutex_lock(&cache
->lock
);
534 memset(cache
->data
, 0, cache
->cache_alloc
);
535 cache
->metadata_written
= 0;
537 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
538 stream
->metadata_out
= 0;
539 stream
->metadata_in
= 0;
541 mutex_unlock(&cache
->lock
);
543 session
->metadata_dumped
= 0;
544 list_for_each_entry(chan
, &session
->chan
, list
) {
545 chan
->metadata_dumped
= 0;
548 list_for_each_entry(event
, &session
->events
, list
) {
549 event
->metadata_dumped
= 0;
552 ret
= _lttng_session_metadata_statedump(session
);
555 mutex_unlock(&sessions_mutex
);
559 int lttng_channel_enable(struct lttng_channel
*channel
)
563 mutex_lock(&sessions_mutex
);
564 if (channel
->channel_type
== METADATA_CHANNEL
) {
568 if (channel
->enabled
) {
572 /* Set transient enabler state to "enabled" */
574 lttng_session_sync_event_enablers(channel
->session
);
575 /* Set atomically the state to "enabled" */
576 WRITE_ONCE(channel
->enabled
, 1);
578 mutex_unlock(&sessions_mutex
);
582 int lttng_channel_disable(struct lttng_channel
*channel
)
586 mutex_lock(&sessions_mutex
);
587 if (channel
->channel_type
== METADATA_CHANNEL
) {
591 if (!channel
->enabled
) {
595 /* Set atomically the state to "disabled" */
596 WRITE_ONCE(channel
->enabled
, 0);
597 /* Set transient enabler state to "enabled" */
599 lttng_session_sync_event_enablers(channel
->session
);
601 mutex_unlock(&sessions_mutex
);
605 int lttng_event_enable(struct lttng_event
*event
)
609 mutex_lock(&sessions_mutex
);
610 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
614 if (event
->enabled
) {
618 switch (event
->instrumentation
) {
619 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
620 case LTTNG_KERNEL_SYSCALL
:
624 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
625 case LTTNG_KERNEL_UPROBE
:
626 WRITE_ONCE(event
->enabled
, 1);
629 case LTTNG_KERNEL_KRETPROBE
:
630 ret
= lttng_kretprobes_event_enable_state(event
, 1);
633 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
634 case LTTNG_KERNEL_NOOP
: /* Fall-through */
640 mutex_unlock(&sessions_mutex
);
644 int lttng_event_disable(struct lttng_event
*event
)
648 mutex_lock(&sessions_mutex
);
649 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
653 if (!event
->enabled
) {
657 switch (event
->instrumentation
) {
658 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
659 case LTTNG_KERNEL_SYSCALL
:
663 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
664 case LTTNG_KERNEL_UPROBE
:
665 WRITE_ONCE(event
->enabled
, 0);
668 case LTTNG_KERNEL_KRETPROBE
:
670 ret
= lttng_kretprobes_event_enable_state(event
, 0);
673 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
674 case LTTNG_KERNEL_NOOP
: /* Fall-through */
680 mutex_unlock(&sessions_mutex
);
684 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
688 mutex_lock(&sessions_mutex
);
689 if (event_notifier
->enabled
) {
693 switch (event_notifier
->instrumentation
) {
694 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
695 case LTTNG_KERNEL_SYSCALL
:
699 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
700 case LTTNG_KERNEL_UPROBE
:
701 WRITE_ONCE(event_notifier
->enabled
, 1);
704 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
705 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
706 case LTTNG_KERNEL_NOOP
: /* Fall-through */
712 mutex_unlock(&sessions_mutex
);
716 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
720 mutex_lock(&sessions_mutex
);
721 if (!event_notifier
->enabled
) {
725 switch (event_notifier
->instrumentation
) {
726 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
727 case LTTNG_KERNEL_SYSCALL
:
731 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
732 case LTTNG_KERNEL_UPROBE
:
733 WRITE_ONCE(event_notifier
->enabled
, 0);
736 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
737 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
738 case LTTNG_KERNEL_NOOP
: /* Fall-through */
744 mutex_unlock(&sessions_mutex
);
748 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
749 const char *transport_name
,
751 size_t subbuf_size
, size_t num_subbuf
,
752 unsigned int switch_timer_interval
,
753 unsigned int read_timer_interval
,
754 enum channel_type channel_type
)
756 struct lttng_channel
*chan
;
757 struct lttng_transport
*transport
= NULL
;
759 mutex_lock(&sessions_mutex
);
760 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
761 goto active
; /* Refuse to add channel to active session */
762 transport
= lttng_transport_find(transport_name
);
764 printk(KERN_WARNING
"LTTng: transport %s not found\n",
768 if (!try_module_get(transport
->owner
)) {
769 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
772 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
775 chan
->session
= session
;
776 chan
->id
= session
->free_chan_id
++;
777 chan
->ops
= &transport
->ops
;
779 * Note: the channel creation op already writes into the packet
780 * headers. Therefore the "chan" information used as input
781 * should be already accessible.
783 chan
->chan
= transport
->ops
.channel_create(transport_name
,
784 chan
, buf_addr
, subbuf_size
, num_subbuf
,
785 switch_timer_interval
, read_timer_interval
);
790 chan
->transport
= transport
;
791 chan
->channel_type
= channel_type
;
792 list_add(&chan
->list
, &session
->chan
);
793 mutex_unlock(&sessions_mutex
);
800 module_put(transport
->owner
);
803 mutex_unlock(&sessions_mutex
);
808 * Only used internally at session destruction for per-cpu channels, and
809 * when metadata channel is released.
810 * Needs to be called with sessions mutex held.
813 void _lttng_channel_destroy(struct lttng_channel
*chan
)
815 chan
->ops
->channel_destroy(chan
->chan
);
816 module_put(chan
->transport
->owner
);
817 list_del(&chan
->list
);
818 lttng_kernel_destroy_context(chan
->ctx
);
822 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
824 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
826 /* Protect the metadata cache with the sessions_mutex. */
827 mutex_lock(&sessions_mutex
);
828 _lttng_channel_destroy(chan
);
829 mutex_unlock(&sessions_mutex
);
831 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
834 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
836 stream
->finalized
= 1;
837 wake_up_interruptible(&stream
->read_wait
);
842 * Supports event creation while tracing session is active.
843 * Needs to be called with sessions mutex held.
845 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
846 struct lttng_kernel_event
*event_param
,
848 const struct lttng_kernel_event_desc
*event_desc
,
849 enum lttng_kernel_instrumentation itype
)
851 struct lttng_session
*session
= chan
->session
;
852 struct lttng_event
*event
;
853 const char *event_name
;
854 struct hlist_head
*head
;
857 if (chan
->free_event_id
== -1U) {
863 case LTTNG_KERNEL_TRACEPOINT
:
864 event_name
= event_desc
->event_name
;
867 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
868 case LTTNG_KERNEL_UPROBE
: /* Fall-through */
869 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
870 case LTTNG_KERNEL_SYSCALL
:
871 event_name
= event_param
->name
;
874 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
875 case LTTNG_KERNEL_NOOP
: /* Fall-through */
882 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
883 LTTNG_EVENT_HT_SIZE
, event_name
);
884 lttng_hlist_for_each_entry(event
, head
, hlist
) {
885 WARN_ON_ONCE(!event
->desc
);
886 if (!strncmp(event
->desc
->event_name
, event_name
,
887 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
888 && chan
== event
->chan
) {
894 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
900 event
->filter
= filter
;
901 event
->id
= chan
->free_event_id
++;
902 event
->instrumentation
= itype
;
903 event
->evtype
= LTTNG_TYPE_EVENT
;
904 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
905 INIT_LIST_HEAD(&event
->enablers_ref_head
);
908 case LTTNG_KERNEL_TRACEPOINT
:
909 /* Event will be enabled by enabler sync. */
911 event
->registered
= 0;
912 event
->desc
= lttng_event_desc_get(event_name
);
917 /* Populate lttng_event structure before event registration. */
921 case LTTNG_KERNEL_KPROBE
:
923 * Needs to be explicitly enabled after creation, since
924 * we may want to apply filters.
927 event
->registered
= 1;
929 * Populate lttng_event structure before event
933 ret
= lttng_kprobes_register_event(event_name
,
934 event_param
->u
.kprobe
.symbol_name
,
935 event_param
->u
.kprobe
.offset
,
936 event_param
->u
.kprobe
.addr
,
942 ret
= try_module_get(event
->desc
->owner
);
946 case LTTNG_KERNEL_KRETPROBE
:
948 struct lttng_event
*event_return
;
950 /* kretprobe defines 2 events */
952 * Needs to be explicitly enabled after creation, since
953 * we may want to apply filters.
956 event
->registered
= 1;
958 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
963 event_return
->chan
= chan
;
964 event_return
->filter
= filter
;
965 event_return
->id
= chan
->free_event_id
++;
966 event_return
->enabled
= 0;
967 event_return
->registered
= 1;
968 event_return
->instrumentation
= itype
;
969 INIT_LIST_HEAD(&event_return
->filter_bytecode_runtime_head
);
970 INIT_LIST_HEAD(&event_return
->enablers_ref_head
);
972 * Populate lttng_event structure before kretprobe registration.
975 ret
= lttng_kretprobes_register(event_name
,
976 event_param
->u
.kretprobe
.symbol_name
,
977 event_param
->u
.kretprobe
.offset
,
978 event_param
->u
.kretprobe
.addr
,
979 event
, event_return
);
981 kmem_cache_free(event_cache
, event_return
);
985 /* Take 2 refs on the module: one per event. */
986 ret
= try_module_get(event
->desc
->owner
);
988 ret
= try_module_get(event
->desc
->owner
);
990 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
992 WARN_ON_ONCE(ret
> 0);
994 kmem_cache_free(event_cache
, event_return
);
995 module_put(event
->desc
->owner
);
996 module_put(event
->desc
->owner
);
997 goto statedump_error
;
999 list_add(&event_return
->list
, &chan
->session
->events
);
1003 case LTTNG_KERNEL_SYSCALL
:
1005 * Needs to be explicitly enabled after creation, since
1006 * we may want to apply filters.
1009 event
->registered
= 0;
1010 event
->desc
= event_desc
;
1011 switch (event_param
->u
.syscall
.entryexit
) {
1012 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1014 goto register_error
;
1015 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1016 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1018 case LTTNG_KERNEL_SYSCALL_EXIT
:
1019 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1022 switch (event_param
->u
.syscall
.abi
) {
1023 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1025 goto register_error
;
1026 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1027 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1029 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1030 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1035 goto register_error
;
1039 case LTTNG_KERNEL_UPROBE
:
1041 * Needs to be explicitly enabled after creation, since
1042 * we may want to apply filters.
1045 event
->registered
= 1;
1048 * Populate lttng_event structure before event
1053 ret
= lttng_uprobes_register_event(event_param
->name
,
1054 event_param
->u
.uprobe
.fd
,
1057 goto register_error
;
1058 ret
= try_module_get(event
->desc
->owner
);
1062 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1063 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1067 goto register_error
;
1069 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
1070 WARN_ON_ONCE(ret
> 0);
1072 goto statedump_error
;
1074 hlist_add_head(&event
->hlist
, head
);
1075 list_add(&event
->list
, &chan
->session
->events
);
1079 /* If a statedump error occurs, events will not be readable. */
1081 kmem_cache_free(event_cache
, event
);
1086 return ERR_PTR(ret
);
1089 struct lttng_event_notifier
*_lttng_event_notifier_create(
1090 const struct lttng_kernel_event_desc
*event_desc
,
1091 uint64_t token
, uint64_t error_counter_index
,
1092 struct lttng_event_notifier_group
*event_notifier_group
,
1093 struct lttng_kernel_event_notifier
*event_notifier_param
,
1094 void *filter
, enum lttng_kernel_instrumentation itype
)
1096 struct lttng_event_notifier
*event_notifier
;
1097 struct lttng_counter
*error_counter
;
1098 const char *event_name
;
1099 struct hlist_head
*head
;
1103 case LTTNG_KERNEL_TRACEPOINT
:
1104 event_name
= event_desc
->event_name
;
1107 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
1108 case LTTNG_KERNEL_UPROBE
: /* Fall-through */
1109 case LTTNG_KERNEL_SYSCALL
:
1110 event_name
= event_notifier_param
->event
.name
;
1113 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1114 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1115 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1122 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1123 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1124 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1125 WARN_ON_ONCE(!event_notifier
->desc
);
1126 if (!strncmp(event_notifier
->desc
->event_name
, event_name
,
1127 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
1128 && event_notifier_group
== event_notifier
->group
1129 && token
== event_notifier
->user_token
) {
1135 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1136 if (!event_notifier
) {
1141 event_notifier
->group
= event_notifier_group
;
1142 event_notifier
->user_token
= token
;
1143 event_notifier
->error_counter_index
= error_counter_index
;
1144 event_notifier
->num_captures
= 0;
1145 event_notifier
->filter
= filter
;
1146 event_notifier
->instrumentation
= itype
;
1147 event_notifier
->evtype
= LTTNG_TYPE_EVENT
;
1148 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1149 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1150 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1151 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1154 case LTTNG_KERNEL_TRACEPOINT
:
1155 /* Event will be enabled by enabler sync. */
1156 event_notifier
->enabled
= 0;
1157 event_notifier
->registered
= 0;
1158 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1159 if (!event_notifier
->desc
) {
1161 goto register_error
;
1163 /* Populate lttng_event_notifier structure before event registration. */
1167 case LTTNG_KERNEL_KPROBE
:
1169 * Needs to be explicitly enabled after creation, since
1170 * we may want to apply filters.
1172 event_notifier
->enabled
= 0;
1173 event_notifier
->registered
= 1;
1175 * Populate lttng_event_notifier structure before event
1179 ret
= lttng_kprobes_register_event_notifier(
1180 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1181 event_notifier_param
->event
.u
.kprobe
.offset
,
1182 event_notifier_param
->event
.u
.kprobe
.addr
,
1186 goto register_error
;
1188 ret
= try_module_get(event_notifier
->desc
->owner
);
1192 case LTTNG_KERNEL_SYSCALL
:
1194 * Needs to be explicitly enabled after creation, since
1195 * we may want to apply filters.
1197 event_notifier
->enabled
= 0;
1198 event_notifier
->registered
= 0;
1199 event_notifier
->desc
= event_desc
;
1200 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1201 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1203 goto register_error
;
1204 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1205 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1207 case LTTNG_KERNEL_SYSCALL_EXIT
:
1208 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1211 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1212 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1214 goto register_error
;
1215 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1216 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1218 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1219 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1223 if (!event_notifier
->desc
) {
1225 goto register_error
;
1229 case LTTNG_KERNEL_UPROBE
:
1231 * Needs to be explicitly enabled after creation, since
1232 * we may want to apply filters.
1234 event_notifier
->enabled
= 0;
1235 event_notifier
->registered
= 1;
1238 * Populate lttng_event_notifier structure before
1239 * event_notifier registration.
1243 ret
= lttng_uprobes_register_event_notifier(
1244 event_notifier_param
->event
.name
,
1245 event_notifier_param
->event
.u
.uprobe
.fd
,
1248 goto register_error
;
1249 ret
= try_module_get(event_notifier
->desc
->owner
);
1253 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1254 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1255 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1259 goto register_error
;
1262 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1263 hlist_add_head(&event_notifier
->hlist
, head
);
1266 * Clear the error counter bucket. The sessiond keeps track of which
1267 * bucket is currently in use. We trust it. The session lock
1268 * synchronizes against concurrent creation of the error
1271 error_counter
= event_notifier_group
->error_counter
;
1272 if (error_counter
) {
1273 size_t dimension_index
[1];
1276 * Check that the index is within the boundary of the counter.
1278 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1279 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1280 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1282 goto register_error
;
1285 dimension_index
[0] = event_notifier
->error_counter_index
;
1286 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1288 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1289 event_notifier
->error_counter_index
);
1290 goto register_error
;
1294 return event_notifier
;
1297 kmem_cache_free(event_notifier_cache
, event_notifier
);
1301 return ERR_PTR(ret
);
1304 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1305 const size_t *dim_indexes
, int32_t cpu
,
1306 int64_t *val
, bool *overflow
, bool *underflow
)
1308 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1309 cpu
, val
, overflow
, underflow
);
1312 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1313 const size_t *dim_indexes
, int64_t *val
,
1314 bool *overflow
, bool *underflow
)
1316 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1317 val
, overflow
, underflow
);
1320 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1321 const size_t *dim_indexes
)
1323 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1326 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1327 struct lttng_kernel_event
*event_param
,
1329 const struct lttng_kernel_event_desc
*event_desc
,
1330 enum lttng_kernel_instrumentation itype
)
1332 struct lttng_event
*event
;
1334 mutex_lock(&sessions_mutex
);
1335 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1337 mutex_unlock(&sessions_mutex
);
1341 struct lttng_event_notifier
*lttng_event_notifier_create(
1342 const struct lttng_kernel_event_desc
*event_desc
,
1343 uint64_t id
, uint64_t error_counter_index
,
1344 struct lttng_event_notifier_group
*event_notifier_group
,
1345 struct lttng_kernel_event_notifier
*event_notifier_param
,
1346 void *filter
, enum lttng_kernel_instrumentation itype
)
1348 struct lttng_event_notifier
*event_notifier
;
1350 mutex_lock(&sessions_mutex
);
1351 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1352 error_counter_index
, event_notifier_group
,
1353 event_notifier_param
, filter
, itype
);
1354 mutex_unlock(&sessions_mutex
);
1355 return event_notifier
;
1358 /* Only used for tracepoints for now. */
1360 void register_event(struct lttng_event
*event
)
1362 const struct lttng_kernel_event_desc
*desc
;
1365 if (event
->registered
)
1369 switch (event
->instrumentation
) {
1370 case LTTNG_KERNEL_TRACEPOINT
:
1371 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1372 desc
->probe_callback
,
1376 case LTTNG_KERNEL_SYSCALL
:
1377 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1380 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
1381 case LTTNG_KERNEL_UPROBE
: /* Fall-through */
1382 case LTTNG_KERNEL_KRETPROBE
:
1386 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1387 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1392 event
->registered
= 1;
1396 * Only used internally at session destruction.
1398 int _lttng_event_unregister(struct lttng_event
*event
)
1400 const struct lttng_kernel_event_desc
*desc
;
1403 if (!event
->registered
)
1407 switch (event
->instrumentation
) {
1408 case LTTNG_KERNEL_TRACEPOINT
:
1409 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->event_kname
,
1410 event
->desc
->probe_callback
,
1414 case LTTNG_KERNEL_KPROBE
:
1415 lttng_kprobes_unregister_event(event
);
1419 case LTTNG_KERNEL_KRETPROBE
:
1420 lttng_kretprobes_unregister(event
);
1424 case LTTNG_KERNEL_SYSCALL
:
1425 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1428 case LTTNG_KERNEL_NOOP
:
1432 case LTTNG_KERNEL_UPROBE
:
1433 lttng_uprobes_unregister_event(event
);
1437 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1442 event
->registered
= 0;
1446 /* Only used for tracepoints for now. */
1448 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1450 const struct lttng_kernel_event_desc
*desc
;
1453 if (event_notifier
->registered
)
1456 desc
= event_notifier
->desc
;
1457 switch (event_notifier
->instrumentation
) {
1458 case LTTNG_KERNEL_TRACEPOINT
:
1459 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1460 desc
->event_notifier_callback
,
1464 case LTTNG_KERNEL_SYSCALL
:
1465 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1468 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
1469 case LTTNG_KERNEL_UPROBE
:
1473 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1474 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1475 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1480 event_notifier
->registered
= 1;
1484 int _lttng_event_notifier_unregister(
1485 struct lttng_event_notifier
*event_notifier
)
1487 const struct lttng_kernel_event_desc
*desc
;
1490 if (!event_notifier
->registered
)
1493 desc
= event_notifier
->desc
;
1494 switch (event_notifier
->instrumentation
) {
1495 case LTTNG_KERNEL_TRACEPOINT
:
1496 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->event_kname
,
1497 event_notifier
->desc
->event_notifier_callback
,
1501 case LTTNG_KERNEL_KPROBE
:
1502 lttng_kprobes_unregister_event_notifier(event_notifier
);
1506 case LTTNG_KERNEL_UPROBE
:
1507 lttng_uprobes_unregister_event_notifier(event_notifier
);
1511 case LTTNG_KERNEL_SYSCALL
:
1512 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1515 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1516 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1517 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1522 event_notifier
->registered
= 0;
1527 * Only used internally at session destruction.
1530 void _lttng_event_destroy(struct lttng_event
*event
)
1532 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1534 switch (event
->instrumentation
) {
1535 case LTTNG_KERNEL_TRACEPOINT
:
1536 lttng_event_desc_put(event
->desc
);
1539 case LTTNG_KERNEL_KPROBE
:
1540 module_put(event
->desc
->owner
);
1541 lttng_kprobes_destroy_event_private(event
);
1544 case LTTNG_KERNEL_KRETPROBE
:
1545 module_put(event
->desc
->owner
);
1546 lttng_kretprobes_destroy_private(event
);
1549 case LTTNG_KERNEL_SYSCALL
:
1552 case LTTNG_KERNEL_UPROBE
:
1553 module_put(event
->desc
->owner
);
1554 lttng_uprobes_destroy_event_private(event
);
1557 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1558 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1562 list_del(&event
->list
);
1563 lttng_kernel_destroy_context(event
->ctx
);
1564 lttng_free_event_filter_runtime(event
);
1565 /* Free event enabler refs */
1566 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1567 &event
->enablers_ref_head
, node
)
1569 kmem_cache_free(event_cache
, event
);
1573 * Only used internally at session destruction.
1576 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1578 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1580 switch (event_notifier
->instrumentation
) {
1581 case LTTNG_KERNEL_TRACEPOINT
:
1582 lttng_event_desc_put(event_notifier
->desc
);
1585 case LTTNG_KERNEL_KPROBE
:
1586 module_put(event_notifier
->desc
->owner
);
1587 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1590 case LTTNG_KERNEL_SYSCALL
:
1593 case LTTNG_KERNEL_UPROBE
:
1594 module_put(event_notifier
->desc
->owner
);
1595 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1598 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1599 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1600 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1604 list_del(&event_notifier
->list
);
1605 lttng_free_event_notifier_filter_runtime(event_notifier
);
1606 /* Free event enabler refs */
1607 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1608 &event_notifier
->enablers_ref_head
, node
)
1610 kmem_cache_free(event_notifier_cache
, event_notifier
);
1613 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1614 enum tracker_type tracker_type
)
1616 switch (tracker_type
) {
1618 return &session
->pid_tracker
;
1620 return &session
->vpid_tracker
;
1622 return &session
->uid_tracker
;
1624 return &session
->vuid_tracker
;
1626 return &session
->gid_tracker
;
1628 return &session
->vgid_tracker
;
1635 int lttng_session_track_id(struct lttng_session
*session
,
1636 enum tracker_type tracker_type
, int id
)
1638 struct lttng_id_tracker
*tracker
;
1641 tracker
= get_tracker(session
, tracker_type
);
1646 mutex_lock(&sessions_mutex
);
1648 /* track all ids: destroy tracker. */
1649 lttng_id_tracker_destroy(tracker
, true);
1652 ret
= lttng_id_tracker_add(tracker
, id
);
1654 mutex_unlock(&sessions_mutex
);
1658 int lttng_session_untrack_id(struct lttng_session
*session
,
1659 enum tracker_type tracker_type
, int id
)
1661 struct lttng_id_tracker
*tracker
;
1664 tracker
= get_tracker(session
, tracker_type
);
1669 mutex_lock(&sessions_mutex
);
1671 /* untrack all ids: replace by empty tracker. */
1672 ret
= lttng_id_tracker_empty_set(tracker
);
1674 ret
= lttng_id_tracker_del(tracker
, id
);
1676 mutex_unlock(&sessions_mutex
);
1681 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1683 struct lttng_id_tracker
*id_tracker
= m
->private;
1684 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1685 struct lttng_id_hash_node
*e
;
1688 mutex_lock(&sessions_mutex
);
1690 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1691 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1693 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1699 /* ID tracker disabled. */
1700 if (iter
>= *pos
&& iter
== 0) {
1701 return id_tracker_p
; /* empty tracker */
1709 /* Called with sessions_mutex held. */
1711 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1713 struct lttng_id_tracker
*id_tracker
= m
->private;
1714 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1715 struct lttng_id_hash_node
*e
;
1720 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1721 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1723 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1724 if (iter
++ >= *ppos
)
1729 /* ID tracker disabled. */
1730 if (iter
>= *ppos
&& iter
== 0)
1731 return p
; /* empty tracker */
1740 void id_list_stop(struct seq_file
*m
, void *p
)
1742 mutex_unlock(&sessions_mutex
);
1746 int id_list_show(struct seq_file
*m
, void *p
)
1748 struct lttng_id_tracker
*id_tracker
= m
->private;
1749 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1752 if (p
== id_tracker_p
) {
1753 /* Tracker disabled. */
1756 const struct lttng_id_hash_node
*e
= p
;
1758 id
= lttng_id_tracker_get_node_id(e
);
1760 switch (id_tracker
->tracker_type
) {
1762 seq_printf(m
, "process { pid = %d; };\n", id
);
1765 seq_printf(m
, "process { vpid = %d; };\n", id
);
1768 seq_printf(m
, "user { uid = %d; };\n", id
);
1771 seq_printf(m
, "user { vuid = %d; };\n", id
);
1774 seq_printf(m
, "group { gid = %d; };\n", id
);
1777 seq_printf(m
, "group { vgid = %d; };\n", id
);
1780 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1786 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1787 .start
= id_list_start
,
1788 .next
= id_list_next
,
1789 .stop
= id_list_stop
,
1790 .show
= id_list_show
,
1794 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1796 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1800 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1802 struct seq_file
*m
= file
->private_data
;
1803 struct lttng_id_tracker
*id_tracker
= m
->private;
1806 WARN_ON_ONCE(!id_tracker
);
1807 ret
= seq_release(inode
, file
);
1809 fput(id_tracker
->session
->file
);
1813 const struct file_operations lttng_tracker_ids_list_fops
= {
1814 .owner
= THIS_MODULE
,
1815 .open
= lttng_tracker_ids_list_open
,
1817 .llseek
= seq_lseek
,
1818 .release
= lttng_tracker_ids_list_release
,
1821 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1822 enum tracker_type tracker_type
)
1824 struct file
*tracker_ids_list_file
;
1828 file_fd
= lttng_get_unused_fd();
1834 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1835 <tng_tracker_ids_list_fops
,
1837 if (IS_ERR(tracker_ids_list_file
)) {
1838 ret
= PTR_ERR(tracker_ids_list_file
);
1841 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1843 goto refcount_error
;
1845 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1848 m
= tracker_ids_list_file
->private_data
;
1850 m
->private = get_tracker(session
, tracker_type
);
1851 BUG_ON(!m
->private);
1852 fd_install(file_fd
, tracker_ids_list_file
);
1857 atomic_long_dec(&session
->file
->f_count
);
1859 fput(tracker_ids_list_file
);
1861 put_unused_fd(file_fd
);
1867 * Enabler management.
1870 int lttng_match_enabler_star_glob(const char *desc_name
,
1871 const char *pattern
)
1873 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1874 desc_name
, LTTNG_SIZE_MAX
))
1880 int lttng_match_enabler_name(const char *desc_name
,
1883 if (strcmp(desc_name
, name
))
1888 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1889 struct lttng_enabler
*enabler
)
1891 const char *desc_name
, *enabler_name
;
1892 bool compat
= false, entry
= false;
1894 enabler_name
= enabler
->event_param
.name
;
1895 switch (enabler
->event_param
.instrumentation
) {
1896 case LTTNG_KERNEL_TRACEPOINT
:
1897 desc_name
= desc
->event_name
;
1898 switch (enabler
->format_type
) {
1899 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1900 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1901 case LTTNG_ENABLER_FORMAT_NAME
:
1902 return lttng_match_enabler_name(desc_name
, enabler_name
);
1908 case LTTNG_KERNEL_SYSCALL
:
1909 desc_name
= desc
->event_name
;
1910 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1911 desc_name
+= strlen("compat_");
1914 if (!strncmp(desc_name
, "syscall_exit_",
1915 strlen("syscall_exit_"))) {
1916 desc_name
+= strlen("syscall_exit_");
1917 } else if (!strncmp(desc_name
, "syscall_entry_",
1918 strlen("syscall_entry_"))) {
1919 desc_name
+= strlen("syscall_entry_");
1925 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1926 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1928 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1932 case LTTNG_KERNEL_SYSCALL_EXIT
:
1939 switch (enabler
->event_param
.u
.syscall
.abi
) {
1940 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1942 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1946 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1953 switch (enabler
->event_param
.u
.syscall
.match
) {
1954 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
1955 switch (enabler
->format_type
) {
1956 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1957 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1958 case LTTNG_ENABLER_FORMAT_NAME
:
1959 return lttng_match_enabler_name(desc_name
, enabler_name
);
1964 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
1965 return -EINVAL
; /* Not implemented. */
1978 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1979 struct lttng_event
*event
)
1981 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1984 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1986 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1987 && event
->chan
== event_enabler
->chan
)
1994 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1995 struct lttng_event_notifier
*event_notifier
)
1997 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1998 event_notifier_enabler
);
2000 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
2002 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
2003 && event_notifier
->group
== event_notifier_enabler
->group
2004 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2011 struct lttng_enabler_ref
*lttng_enabler_ref(
2012 struct list_head
*enablers_ref_list
,
2013 struct lttng_enabler
*enabler
)
2015 struct lttng_enabler_ref
*enabler_ref
;
2017 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2018 if (enabler_ref
->ref
== enabler
)
2025 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2027 struct lttng_session
*session
= event_enabler
->chan
->session
;
2028 struct lttng_kernel_probe_desc
*probe_desc
;
2029 const struct lttng_kernel_event_desc
*desc
;
2031 struct list_head
*probe_list
;
2033 probe_list
= lttng_get_probe_list_head();
2035 * For each probe event, if we find that a probe event matches
2036 * our enabler, create an associated lttng_event if not
2039 list_for_each_entry(probe_desc
, probe_list
, head
) {
2040 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2042 struct hlist_head
*head
;
2043 struct lttng_event
*event
;
2045 desc
= probe_desc
->event_desc
[i
];
2046 if (!lttng_desc_match_enabler(desc
,
2047 lttng_event_enabler_as_enabler(event_enabler
)))
2051 * Check if already created.
2053 head
= utils_borrow_hash_table_bucket(
2054 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2056 lttng_hlist_for_each_entry(event
, head
, hlist
) {
2057 if (event
->desc
== desc
2058 && event
->chan
== event_enabler
->chan
)
2065 * We need to create an event for this
2068 event
= _lttng_event_create(event_enabler
->chan
,
2070 LTTNG_KERNEL_TRACEPOINT
);
2072 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2073 probe_desc
->event_desc
[i
]->event_name
);
2080 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2082 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2083 struct lttng_kernel_probe_desc
*probe_desc
;
2084 const struct lttng_kernel_event_desc
*desc
;
2086 struct list_head
*probe_list
;
2088 probe_list
= lttng_get_probe_list_head();
2090 * For each probe event, if we find that a probe event matches
2091 * our enabler, create an associated lttng_event_notifier if not
2094 list_for_each_entry(probe_desc
, probe_list
, head
) {
2095 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2097 struct hlist_head
*head
;
2098 struct lttng_event_notifier
*event_notifier
;
2100 desc
= probe_desc
->event_desc
[i
];
2101 if (!lttng_desc_match_enabler(desc
,
2102 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2106 * Check if already created.
2108 head
= utils_borrow_hash_table_bucket(
2109 event_notifier_group
->event_notifiers_ht
.table
,
2110 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2111 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2112 if (event_notifier
->desc
== desc
2113 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2120 * We need to create a event_notifier for this event probe.
2122 event_notifier
= _lttng_event_notifier_create(desc
,
2123 event_notifier_enabler
->base
.user_token
,
2124 event_notifier_enabler
->error_counter_index
,
2125 event_notifier_group
, NULL
, NULL
,
2126 LTTNG_KERNEL_TRACEPOINT
);
2127 if (IS_ERR(event_notifier
)) {
2128 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2129 probe_desc
->event_desc
[i
]->event_name
);
2136 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2140 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2145 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2149 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2151 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2156 * Create struct lttng_event if it is missing and present in the list of
2157 * tracepoint probes.
2158 * Should be called with sessions mutex held.
2161 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2163 switch (event_enabler
->base
.event_param
.instrumentation
) {
2164 case LTTNG_KERNEL_TRACEPOINT
:
2165 lttng_create_tracepoint_event_if_missing(event_enabler
);
2168 case LTTNG_KERNEL_SYSCALL
:
2169 lttng_create_syscall_event_if_missing(event_enabler
);
2179 * Create events associated with an event_enabler (if not already present),
2180 * and add backward reference from the event to the enabler.
2181 * Should be called with sessions mutex held.
2184 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2186 struct lttng_channel
*chan
= event_enabler
->chan
;
2187 struct lttng_session
*session
= event_enabler
->chan
->session
;
2188 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2189 struct lttng_event
*event
;
2191 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2192 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2193 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2194 !strcmp(base_enabler
->event_param
.name
, "*")) {
2195 int enabled
= base_enabler
->enabled
;
2196 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2198 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2199 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2201 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2202 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2205 /* First ensure that probe events are created for this enabler. */
2206 lttng_create_event_if_missing(event_enabler
);
2208 /* For each event matching event_enabler in session event list. */
2209 list_for_each_entry(event
, &session
->events
, list
) {
2210 struct lttng_enabler_ref
*enabler_ref
;
2212 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2214 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2215 lttng_event_enabler_as_enabler(event_enabler
));
2218 * If no backward ref, create it.
2219 * Add backward ref from event to event_enabler.
2221 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2224 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2225 list_add(&enabler_ref
->node
,
2226 &event
->enablers_ref_head
);
2230 * Link filter bytecodes if not linked yet.
2232 lttng_enabler_link_bytecode(event
->desc
,
2234 &event
->filter_bytecode_runtime_head
,
2235 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2237 /* TODO: merge event context. */
2243 * Create struct lttng_event_notifier if it is missing and present in the list of
2244 * tracepoint probes.
2245 * Should be called with sessions mutex held.
2248 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2250 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2251 case LTTNG_KERNEL_TRACEPOINT
:
2252 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2255 case LTTNG_KERNEL_SYSCALL
:
2256 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2266 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2269 int lttng_event_notifier_enabler_ref_event_notifiers(
2270 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2272 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2273 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2274 struct lttng_event_notifier
*event_notifier
;
2276 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2277 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2278 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2279 !strcmp(base_enabler
->event_param
.name
, "*")) {
2281 int enabled
= base_enabler
->enabled
;
2282 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2284 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2285 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2287 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2288 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2292 /* First ensure that probe event_notifiers are created for this enabler. */
2293 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2295 /* Link the created event_notifier with its associated enabler. */
2296 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2297 struct lttng_enabler_ref
*enabler_ref
;
2299 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2302 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2303 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2306 * If no backward ref, create it.
2307 * Add backward ref from event_notifier to enabler.
2309 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2313 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2314 event_notifier_enabler
);
2315 list_add(&enabler_ref
->node
,
2316 &event_notifier
->enablers_ref_head
);
2320 * Link filter bytecodes if not linked yet.
2322 lttng_enabler_link_bytecode(event_notifier
->desc
,
2323 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2324 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2326 /* Link capture bytecodes if not linked yet. */
2327 lttng_enabler_link_bytecode(event_notifier
->desc
,
2328 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2329 &event_notifier_enabler
->capture_bytecode_head
);
2331 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2337 * Called at module load: connect the probe on all enablers matching
2339 * Called with sessions lock held.
2341 int lttng_fix_pending_events(void)
2343 struct lttng_session
*session
;
2345 list_for_each_entry(session
, &sessions
, list
)
2346 lttng_session_lazy_sync_event_enablers(session
);
2350 static bool lttng_event_notifier_group_has_active_event_notifiers(
2351 struct lttng_event_notifier_group
*event_notifier_group
)
2353 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2355 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2357 if (event_notifier_enabler
->base
.enabled
)
2363 bool lttng_event_notifier_active(void)
2365 struct lttng_event_notifier_group
*event_notifier_group
;
2367 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2368 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2374 int lttng_fix_pending_event_notifiers(void)
2376 struct lttng_event_notifier_group
*event_notifier_group
;
2378 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2379 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2383 struct lttng_event_enabler
*lttng_event_enabler_create(
2384 enum lttng_enabler_format_type format_type
,
2385 struct lttng_kernel_event
*event_param
,
2386 struct lttng_channel
*chan
)
2388 struct lttng_event_enabler
*event_enabler
;
2390 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2393 event_enabler
->base
.format_type
= format_type
;
2394 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2395 memcpy(&event_enabler
->base
.event_param
, event_param
,
2396 sizeof(event_enabler
->base
.event_param
));
2397 event_enabler
->chan
= chan
;
2399 event_enabler
->base
.enabled
= 0;
2400 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2401 mutex_lock(&sessions_mutex
);
2402 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2403 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2404 mutex_unlock(&sessions_mutex
);
2405 return event_enabler
;
2408 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2410 mutex_lock(&sessions_mutex
);
2411 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2412 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2413 mutex_unlock(&sessions_mutex
);
2417 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2419 mutex_lock(&sessions_mutex
);
2420 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2421 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2422 mutex_unlock(&sessions_mutex
);
2427 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2428 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2430 struct lttng_bytecode_node
*bytecode_node
;
2431 uint32_t bytecode_len
;
2434 ret
= get_user(bytecode_len
, &bytecode
->len
);
2437 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2441 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2442 sizeof(*bytecode
) + bytecode_len
);
2446 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2447 bytecode_node
->enabler
= enabler
;
2448 /* Enforce length based on allocated size */
2449 bytecode_node
->bc
.len
= bytecode_len
;
2450 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2455 lttng_kvfree(bytecode_node
);
2459 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2460 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2463 ret
= lttng_enabler_attach_filter_bytecode(
2464 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2468 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2475 int lttng_event_add_callsite(struct lttng_event
*event
,
2476 struct lttng_kernel_event_callsite __user
*callsite
)
2479 switch (event
->instrumentation
) {
2480 case LTTNG_KERNEL_UPROBE
:
2481 return lttng_uprobes_event_add_callsite(event
, callsite
);
2487 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2488 struct lttng_kernel_context
*context_param
)
2494 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2496 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2498 /* Destroy filter bytecode */
2499 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2500 &enabler
->filter_bytecode_head
, node
) {
2501 lttng_kvfree(filter_node
);
2506 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2508 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2510 /* Destroy contexts */
2511 lttng_kernel_destroy_context(event_enabler
->ctx
);
2513 list_del(&event_enabler
->node
);
2514 kfree(event_enabler
);
2517 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2518 struct lttng_event_notifier_group
*event_notifier_group
,
2519 enum lttng_enabler_format_type format_type
,
2520 struct lttng_kernel_event_notifier
*event_notifier_param
)
2522 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2524 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2525 if (!event_notifier_enabler
)
2528 event_notifier_enabler
->base
.format_type
= format_type
;
2529 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2530 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2532 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2533 event_notifier_enabler
->num_captures
= 0;
2535 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2536 sizeof(event_notifier_enabler
->base
.event_param
));
2537 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2539 event_notifier_enabler
->base
.enabled
= 0;
2540 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2541 event_notifier_enabler
->group
= event_notifier_group
;
2543 mutex_lock(&sessions_mutex
);
2544 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2545 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2547 mutex_unlock(&sessions_mutex
);
2549 return event_notifier_enabler
;
2552 int lttng_event_notifier_enabler_enable(
2553 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2555 mutex_lock(&sessions_mutex
);
2556 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2557 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2558 mutex_unlock(&sessions_mutex
);
2562 int lttng_event_notifier_enabler_disable(
2563 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2565 mutex_lock(&sessions_mutex
);
2566 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2567 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2568 mutex_unlock(&sessions_mutex
);
2572 int lttng_event_notifier_enabler_attach_filter_bytecode(
2573 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2574 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2578 ret
= lttng_enabler_attach_filter_bytecode(
2579 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2584 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2591 int lttng_event_notifier_enabler_attach_capture_bytecode(
2592 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2593 struct lttng_kernel_capture_bytecode __user
*bytecode
)
2595 struct lttng_bytecode_node
*bytecode_node
;
2596 struct lttng_enabler
*enabler
=
2597 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2598 uint32_t bytecode_len
;
2601 ret
= get_user(bytecode_len
, &bytecode
->len
);
2605 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2610 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2611 sizeof(*bytecode
) + bytecode_len
);
2615 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2616 bytecode_node
->enabler
= enabler
;
2618 /* Enforce length based on allocated size */
2619 bytecode_node
->bc
.len
= bytecode_len
;
2620 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2622 event_notifier_enabler
->num_captures
++;
2624 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2628 lttng_kvfree(bytecode_node
);
2633 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2634 struct lttng_kernel_event_callsite __user
*callsite
)
2637 switch (event_notifier
->instrumentation
) {
2638 case LTTNG_KERNEL_UPROBE
:
2639 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2646 int lttng_event_notifier_enabler_attach_context(
2647 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2648 struct lttng_kernel_context
*context_param
)
2654 void lttng_event_notifier_enabler_destroy(
2655 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2657 if (!event_notifier_enabler
) {
2661 list_del(&event_notifier_enabler
->node
);
2663 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2664 kfree(event_notifier_enabler
);
2668 * lttng_session_sync_event_enablers should be called just before starting a
2670 * Should be called with sessions mutex held.
2673 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2675 struct lttng_event_enabler
*event_enabler
;
2676 struct lttng_event
*event
;
2678 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2679 lttng_event_enabler_ref_events(event_enabler
);
2681 * For each event, if at least one of its enablers is enabled,
2682 * and its channel and session transient states are enabled, we
2683 * enable the event, else we disable it.
2685 list_for_each_entry(event
, &session
->events
, list
) {
2686 struct lttng_enabler_ref
*enabler_ref
;
2687 struct lttng_bytecode_runtime
*runtime
;
2688 int enabled
= 0, has_enablers_without_bytecode
= 0;
2690 switch (event
->instrumentation
) {
2691 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
2692 case LTTNG_KERNEL_SYSCALL
:
2694 list_for_each_entry(enabler_ref
,
2695 &event
->enablers_ref_head
, node
) {
2696 if (enabler_ref
->ref
->enabled
) {
2704 /* Not handled with lazy sync. */
2708 * Enabled state is based on union of enablers, with
2709 * intesection of session and channel transient enable
2712 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2714 WRITE_ONCE(event
->enabled
, enabled
);
2716 * Sync tracepoint registration with event enabled
2720 register_event(event
);
2722 _lttng_event_unregister(event
);
2725 /* Check if has enablers without bytecode enabled */
2726 list_for_each_entry(enabler_ref
,
2727 &event
->enablers_ref_head
, node
) {
2728 if (enabler_ref
->ref
->enabled
2729 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2730 has_enablers_without_bytecode
= 1;
2734 event
->has_enablers_without_bytecode
=
2735 has_enablers_without_bytecode
;
2737 /* Enable filters */
2738 list_for_each_entry(runtime
,
2739 &event
->filter_bytecode_runtime_head
, node
)
2740 lttng_bytecode_filter_sync_state(runtime
);
2745 * Apply enablers to session events, adding events to session if need
2746 * be. It is required after each modification applied to an active
2747 * session, and right before session "start".
2748 * "lazy" sync means we only sync if required.
2749 * Should be called with sessions mutex held.
2752 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2754 /* We can skip if session is not active */
2755 if (!session
->active
)
2757 lttng_session_sync_event_enablers(session
);
2761 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2763 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2764 struct lttng_event_notifier
*event_notifier
;
2766 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2767 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2770 * For each event_notifier, if at least one of its enablers is enabled,
2771 * we enable the event_notifier, else we disable it.
2773 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2774 struct lttng_enabler_ref
*enabler_ref
;
2775 struct lttng_bytecode_runtime
*runtime
;
2776 int enabled
= 0, has_enablers_without_bytecode
= 0;
2778 switch (event_notifier
->instrumentation
) {
2779 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
2780 case LTTNG_KERNEL_SYSCALL
:
2781 /* Enable event_notifiers */
2782 list_for_each_entry(enabler_ref
,
2783 &event_notifier
->enablers_ref_head
, node
) {
2784 if (enabler_ref
->ref
->enabled
) {
2792 /* Not handled with sync. */
2796 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2798 * Sync tracepoint registration with event_notifier enabled
2802 if (!event_notifier
->registered
)
2803 register_event_notifier(event_notifier
);
2805 if (event_notifier
->registered
)
2806 _lttng_event_notifier_unregister(event_notifier
);
2809 /* Check if has enablers without bytecode enabled */
2810 list_for_each_entry(enabler_ref
,
2811 &event_notifier
->enablers_ref_head
, node
) {
2812 if (enabler_ref
->ref
->enabled
2813 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2814 has_enablers_without_bytecode
= 1;
2818 event_notifier
->has_enablers_without_bytecode
=
2819 has_enablers_without_bytecode
;
2821 /* Enable filters */
2822 list_for_each_entry(runtime
,
2823 &event_notifier
->filter_bytecode_runtime_head
, node
)
2824 lttng_bytecode_filter_sync_state(runtime
);
2826 /* Enable captures */
2827 list_for_each_entry(runtime
,
2828 &event_notifier
->capture_bytecode_runtime_head
, node
)
2829 lttng_bytecode_capture_sync_state(runtime
);
2831 WRITE_ONCE(event_notifier
->eval_capture
, !!event_notifier
->num_captures
);
2836 * Serialize at most one packet worth of metadata into a metadata
2838 * We grab the metadata cache mutex to get exclusive access to our metadata
2839 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2840 * allows us to do racy operations such as looking for remaining space left in
2841 * packet and write, since mutual exclusion protects us from concurrent writes.
2842 * Mutual exclusion on the metadata cache allow us to read the cache content
2843 * without racing against reallocation of the cache by updates.
2844 * Returns the number of bytes written in the channel, 0 if no data
2845 * was written and a negative value on error.
2847 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2848 struct channel
*chan
, bool *coherent
)
2850 struct lib_ring_buffer_ctx ctx
;
2852 size_t len
, reserve_len
;
2855 * Ensure we support mutiple get_next / put sequences followed by
2856 * put_next. The metadata cache lock protects reading the metadata
2857 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2858 * "flush" operations on the buffer invoked by different processes.
2859 * Moreover, since the metadata cache memory can be reallocated, we
2860 * need to have exclusive access against updates even though we only
2863 mutex_lock(&stream
->metadata_cache
->lock
);
2864 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2865 if (stream
->metadata_in
!= stream
->metadata_out
)
2868 /* Metadata regenerated, change the version. */
2869 if (stream
->metadata_cache
->version
!= stream
->version
)
2870 stream
->version
= stream
->metadata_cache
->version
;
2872 len
= stream
->metadata_cache
->metadata_written
-
2873 stream
->metadata_in
;
2876 reserve_len
= min_t(size_t,
2877 stream
->transport
->ops
.packet_avail_size(chan
),
2879 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2882 * If reservation failed, return an error to the caller.
2884 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2886 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2887 stream
->coherent
= false;
2890 stream
->transport
->ops
.event_write(&ctx
,
2891 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2893 stream
->transport
->ops
.event_commit(&ctx
);
2894 stream
->metadata_in
+= reserve_len
;
2895 if (reserve_len
< len
)
2896 stream
->coherent
= false;
2898 stream
->coherent
= true;
2903 *coherent
= stream
->coherent
;
2904 mutex_unlock(&stream
->metadata_cache
->lock
);
2909 void lttng_metadata_begin(struct lttng_session
*session
)
2911 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2912 mutex_lock(&session
->metadata_cache
->lock
);
2916 void lttng_metadata_end(struct lttng_session
*session
)
2918 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2919 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2920 struct lttng_metadata_stream
*stream
;
2922 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2923 wake_up_interruptible(&stream
->read_wait
);
2924 mutex_unlock(&session
->metadata_cache
->lock
);
2929 * Write the metadata to the metadata cache.
2930 * Must be called with sessions_mutex held.
2931 * The metadata cache lock protects us from concurrent read access from
2932 * thread outputting metadata content to ring buffer.
2933 * The content of the printf is printed as a single atomic metadata
2936 int lttng_metadata_printf(struct lttng_session
*session
,
2937 const char *fmt
, ...)
2943 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2946 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2952 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2953 if (session
->metadata_cache
->metadata_written
+ len
>
2954 session
->metadata_cache
->cache_alloc
) {
2955 char *tmp_cache_realloc
;
2956 unsigned int tmp_cache_alloc_size
;
2958 tmp_cache_alloc_size
= max_t(unsigned int,
2959 session
->metadata_cache
->cache_alloc
+ len
,
2960 session
->metadata_cache
->cache_alloc
<< 1);
2961 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2962 if (!tmp_cache_realloc
)
2964 if (session
->metadata_cache
->data
) {
2965 memcpy(tmp_cache_realloc
,
2966 session
->metadata_cache
->data
,
2967 session
->metadata_cache
->cache_alloc
);
2968 vfree(session
->metadata_cache
->data
);
2971 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2972 session
->metadata_cache
->data
= tmp_cache_realloc
;
2974 memcpy(session
->metadata_cache
->data
+
2975 session
->metadata_cache
->metadata_written
,
2977 session
->metadata_cache
->metadata_written
+= len
;
2988 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2992 for (i
= 0; i
< nesting
; i
++) {
2995 ret
= lttng_metadata_printf(session
, " ");
3004 int lttng_field_name_statedump(struct lttng_session
*session
,
3005 const struct lttng_kernel_event_field
*field
,
3008 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3012 int _lttng_integer_type_statedump(struct lttng_session
*session
,
3013 const struct lttng_kernel_type_integer
*type
,
3014 enum lttng_kernel_string_encoding parent_encoding
,
3019 ret
= print_tabs(session
, nesting
);
3022 ret
= lttng_metadata_printf(session
,
3023 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3027 (parent_encoding
== lttng_kernel_string_encoding_none
)
3029 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3033 #if __BYTE_ORDER == __BIG_ENDIAN
3034 type
->reverse_byte_order
? " byte_order = le;" : ""
3036 type
->reverse_byte_order
? " byte_order = be;" : ""
3043 * Must be called with sessions_mutex held.
3046 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3047 const struct lttng_kernel_type_struct
*type
,
3051 uint32_t i
, nr_fields
;
3052 unsigned int alignment
;
3054 ret
= print_tabs(session
, nesting
);
3057 ret
= lttng_metadata_printf(session
,
3061 nr_fields
= type
->nr_fields
;
3062 for (i
= 0; i
< nr_fields
; i
++) {
3063 const struct lttng_kernel_event_field
*iter_field
;
3065 iter_field
= type
->fields
[i
];
3066 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3070 ret
= print_tabs(session
, nesting
);
3073 alignment
= type
->alignment
;
3075 ret
= lttng_metadata_printf(session
,
3079 ret
= lttng_metadata_printf(session
,
3086 * Must be called with sessions_mutex held.
3089 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3090 const struct lttng_kernel_event_field
*field
,
3095 ret
= _lttng_struct_type_statedump(session
,
3096 lttng_kernel_get_type_struct(field
->type
), nesting
);
3099 return lttng_field_name_statedump(session
, field
, nesting
);
3103 * Must be called with sessions_mutex held.
3106 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3107 const struct lttng_kernel_type_variant
*type
,
3111 uint32_t i
, nr_choices
;
3114 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3116 if (type
->alignment
!= 0)
3118 ret
= print_tabs(session
, nesting
);
3121 ret
= lttng_metadata_printf(session
,
3122 "variant <_%s> {\n",
3126 nr_choices
= type
->nr_choices
;
3127 for (i
= 0; i
< nr_choices
; i
++) {
3128 const struct lttng_kernel_event_field
*iter_field
;
3130 iter_field
= type
->choices
[i
];
3131 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3135 ret
= print_tabs(session
, nesting
);
3138 ret
= lttng_metadata_printf(session
,
3144 * Must be called with sessions_mutex held.
3147 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3148 const struct lttng_kernel_event_field
*field
,
3153 ret
= _lttng_variant_type_statedump(session
,
3154 lttng_kernel_get_type_variant(field
->type
), nesting
);
3157 return lttng_field_name_statedump(session
, field
, nesting
);
3161 * Must be called with sessions_mutex held.
3164 int _lttng_array_field_statedump(struct lttng_session
*session
,
3165 const struct lttng_kernel_event_field
*field
,
3169 const struct lttng_kernel_type_array
*array_type
;
3170 const struct lttng_kernel_type_common
*elem_type
;
3172 array_type
= lttng_kernel_get_type_array(field
->type
);
3173 WARN_ON_ONCE(!array_type
);
3175 if (array_type
->alignment
) {
3176 ret
= print_tabs(session
, nesting
);
3179 ret
= lttng_metadata_printf(session
,
3180 "struct { } align(%u) _%s_padding;\n",
3181 array_type
->alignment
* CHAR_BIT
,
3187 * Nested compound types: Only array of structures and variants are
3188 * currently supported.
3190 elem_type
= array_type
->elem_type
;
3191 switch (elem_type
->type
) {
3192 case lttng_kernel_type_integer
:
3193 case lttng_kernel_type_struct
:
3194 case lttng_kernel_type_variant
:
3195 ret
= _lttng_type_statedump(session
, elem_type
,
3196 array_type
->encoding
, nesting
);
3204 ret
= lttng_metadata_printf(session
,
3207 array_type
->length
);
3212 * Must be called with sessions_mutex held.
3215 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3216 const struct lttng_kernel_event_field
*field
,
3220 const char *length_name
;
3221 const struct lttng_kernel_type_sequence
*sequence_type
;
3222 const struct lttng_kernel_type_common
*elem_type
;
3224 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3225 WARN_ON_ONCE(!sequence_type
);
3227 length_name
= sequence_type
->length_name
;
3229 if (sequence_type
->alignment
) {
3230 ret
= print_tabs(session
, nesting
);
3233 ret
= lttng_metadata_printf(session
,
3234 "struct { } align(%u) _%s_padding;\n",
3235 sequence_type
->alignment
* CHAR_BIT
,
3242 * Nested compound types: Only array of structures and variants are
3243 * currently supported.
3245 elem_type
= sequence_type
->elem_type
;
3246 switch (elem_type
->type
) {
3247 case lttng_kernel_type_integer
:
3248 case lttng_kernel_type_struct
:
3249 case lttng_kernel_type_variant
:
3250 ret
= _lttng_type_statedump(session
, elem_type
,
3251 sequence_type
->encoding
, nesting
);
3259 ret
= lttng_metadata_printf(session
,
3262 sequence_type
->length_name
);
3267 * Must be called with sessions_mutex held.
3270 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3271 const struct lttng_kernel_type_enum
*type
,
3274 const struct lttng_kernel_enum_desc
*enum_desc
;
3275 const struct lttng_kernel_type_common
*container_type
;
3277 unsigned int i
, nr_entries
;
3279 container_type
= type
->container_type
;
3280 if (container_type
->type
!= lttng_kernel_type_integer
) {
3284 enum_desc
= type
->desc
;
3285 nr_entries
= enum_desc
->nr_entries
;
3287 ret
= print_tabs(session
, nesting
);
3290 ret
= lttng_metadata_printf(session
, "enum : ");
3293 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3294 lttng_kernel_string_encoding_none
, 0);
3297 ret
= lttng_metadata_printf(session
, " {\n");
3300 /* Dump all entries */
3301 for (i
= 0; i
< nr_entries
; i
++) {
3302 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3305 ret
= print_tabs(session
, nesting
+ 1);
3308 ret
= lttng_metadata_printf(session
,
3312 len
= strlen(entry
->string
);
3313 /* Escape the character '"' */
3314 for (j
= 0; j
< len
; j
++) {
3315 char c
= entry
->string
[j
];
3319 ret
= lttng_metadata_printf(session
,
3323 ret
= lttng_metadata_printf(session
,
3327 ret
= lttng_metadata_printf(session
,
3334 ret
= lttng_metadata_printf(session
, "\"");
3338 if (entry
->options
.is_auto
) {
3339 ret
= lttng_metadata_printf(session
, ",\n");
3343 ret
= lttng_metadata_printf(session
,
3347 if (entry
->start
.signedness
)
3348 ret
= lttng_metadata_printf(session
,
3349 "%lld", (long long) entry
->start
.value
);
3351 ret
= lttng_metadata_printf(session
,
3352 "%llu", entry
->start
.value
);
3355 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3357 == entry
->end
.value
) {
3358 ret
= lttng_metadata_printf(session
,
3361 if (entry
->end
.signedness
) {
3362 ret
= lttng_metadata_printf(session
,
3364 (long long) entry
->end
.value
);
3366 ret
= lttng_metadata_printf(session
,
3375 ret
= print_tabs(session
, nesting
);
3378 ret
= lttng_metadata_printf(session
, "}");
3384 * Must be called with sessions_mutex held.
3387 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3388 const struct lttng_kernel_event_field
*field
,
3392 const struct lttng_kernel_type_enum
*enum_type
;
3394 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3395 WARN_ON_ONCE(!enum_type
);
3396 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3399 return lttng_field_name_statedump(session
, field
, nesting
);
3403 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3404 const struct lttng_kernel_event_field
*field
,
3409 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3410 lttng_kernel_string_encoding_none
, nesting
);
3413 return lttng_field_name_statedump(session
, field
, nesting
);
3417 int _lttng_string_type_statedump(struct lttng_session
*session
,
3418 const struct lttng_kernel_type_string
*type
,
3423 /* Default encoding is UTF8 */
3424 ret
= print_tabs(session
, nesting
);
3427 ret
= lttng_metadata_printf(session
,
3429 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3430 " { encoding = ASCII; }" : "");
3435 int _lttng_string_field_statedump(struct lttng_session
*session
,
3436 const struct lttng_kernel_event_field
*field
,
3439 const struct lttng_kernel_type_string
*string_type
;
3442 string_type
= lttng_kernel_get_type_string(field
->type
);
3443 WARN_ON_ONCE(!string_type
);
3444 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3447 return lttng_field_name_statedump(session
, field
, nesting
);
3451 * Must be called with sessions_mutex held.
3454 int _lttng_type_statedump(struct lttng_session
*session
,
3455 const struct lttng_kernel_type_common
*type
,
3456 enum lttng_kernel_string_encoding parent_encoding
,
3461 switch (type
->type
) {
3462 case lttng_kernel_type_integer
:
3463 ret
= _lttng_integer_type_statedump(session
,
3464 lttng_kernel_get_type_integer(type
),
3465 parent_encoding
, nesting
);
3467 case lttng_kernel_type_enum
:
3468 ret
= _lttng_enum_type_statedump(session
,
3469 lttng_kernel_get_type_enum(type
),
3472 case lttng_kernel_type_string
:
3473 ret
= _lttng_string_type_statedump(session
,
3474 lttng_kernel_get_type_string(type
),
3477 case lttng_kernel_type_struct
:
3478 ret
= _lttng_struct_type_statedump(session
,
3479 lttng_kernel_get_type_struct(type
),
3482 case lttng_kernel_type_variant
:
3483 ret
= _lttng_variant_type_statedump(session
,
3484 lttng_kernel_get_type_variant(type
),
3488 /* Nested arrays and sequences are not supported yet. */
3489 case lttng_kernel_type_array
:
3490 case lttng_kernel_type_sequence
:
3499 * Must be called with sessions_mutex held.
3502 int _lttng_field_statedump(struct lttng_session
*session
,
3503 const struct lttng_kernel_event_field
*field
,
3508 switch (field
->type
->type
) {
3509 case lttng_kernel_type_integer
:
3510 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3512 case lttng_kernel_type_enum
:
3513 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3515 case lttng_kernel_type_string
:
3516 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3518 case lttng_kernel_type_struct
:
3519 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3521 case lttng_kernel_type_array
:
3522 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3524 case lttng_kernel_type_sequence
:
3525 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3527 case lttng_kernel_type_variant
:
3528 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3539 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3540 struct lttng_kernel_ctx
*ctx
)
3547 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3548 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3550 ret
= _lttng_field_statedump(session
, field
->event_field
, 2);
3558 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3559 struct lttng_event
*event
)
3561 const struct lttng_kernel_event_desc
*desc
= event
->desc
;
3565 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3566 const struct lttng_kernel_event_field
*field
= desc
->fields
[i
];
3568 ret
= _lttng_field_statedump(session
, field
, 2);
3576 * Must be called with sessions_mutex held.
3577 * The entire event metadata is printed as a single atomic metadata
3581 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3582 struct lttng_channel
*chan
,
3583 struct lttng_event
*event
)
3587 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3589 if (chan
->channel_type
== METADATA_CHANNEL
)
3592 lttng_metadata_begin(session
);
3594 ret
= lttng_metadata_printf(session
,
3598 " stream_id = %u;\n",
3599 event
->desc
->event_name
,
3606 ret
= lttng_metadata_printf(session
,
3607 " context := struct {\n");
3611 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3615 ret
= lttng_metadata_printf(session
,
3621 ret
= lttng_metadata_printf(session
,
3622 " fields := struct {\n"
3627 ret
= _lttng_fields_metadata_statedump(session
, event
);
3632 * LTTng space reservation can only reserve multiples of the
3635 ret
= lttng_metadata_printf(session
,
3641 event
->metadata_dumped
= 1;
3643 lttng_metadata_end(session
);
3649 * Must be called with sessions_mutex held.
3650 * The entire channel metadata is printed as a single atomic metadata
3654 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3655 struct lttng_channel
*chan
)
3659 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3662 if (chan
->channel_type
== METADATA_CHANNEL
)
3665 lttng_metadata_begin(session
);
3667 WARN_ON_ONCE(!chan
->header_type
);
3668 ret
= lttng_metadata_printf(session
,
3671 " event.header := %s;\n"
3672 " packet.context := struct packet_context;\n",
3674 chan
->header_type
== 1 ? "struct event_header_compact" :
3675 "struct event_header_large");
3680 ret
= lttng_metadata_printf(session
,
3681 " event.context := struct {\n");
3685 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3689 ret
= lttng_metadata_printf(session
,
3695 ret
= lttng_metadata_printf(session
,
3698 chan
->metadata_dumped
= 1;
3700 lttng_metadata_end(session
);
3705 * Must be called with sessions_mutex held.
3708 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3710 return lttng_metadata_printf(session
,
3711 "struct packet_context {\n"
3712 " uint64_clock_monotonic_t timestamp_begin;\n"
3713 " uint64_clock_monotonic_t timestamp_end;\n"
3714 " uint64_t content_size;\n"
3715 " uint64_t packet_size;\n"
3716 " uint64_t packet_seq_num;\n"
3717 " unsigned long events_discarded;\n"
3718 " uint32_t cpu_id;\n"
3725 * id: range: 0 - 30.
3726 * id 31 is reserved to indicate an extended header.
3729 * id: range: 0 - 65534.
3730 * id 65535 is reserved to indicate an extended header.
3732 * Must be called with sessions_mutex held.
3735 int _lttng_event_header_declare(struct lttng_session
*session
)
3737 return lttng_metadata_printf(session
,
3738 "struct event_header_compact {\n"
3739 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3742 " uint27_clock_monotonic_t timestamp;\n"
3746 " uint64_clock_monotonic_t timestamp;\n"
3751 "struct event_header_large {\n"
3752 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3755 " uint32_clock_monotonic_t timestamp;\n"
3759 " uint64_clock_monotonic_t timestamp;\n"
3763 lttng_alignof(uint32_t) * CHAR_BIT
,
3764 lttng_alignof(uint16_t) * CHAR_BIT
3769 * Approximation of NTP time of day to clock monotonic correlation,
3770 * taken at start of trace.
3771 * Yes, this is only an approximation. Yes, we can (and will) do better
3772 * in future versions.
3773 * This function may return a negative offset. It may happen if the
3774 * system sets the REALTIME clock to 0 after boot.
3776 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3780 int64_t measure_clock_offset(void)
3782 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3783 uint64_t tcf
= trace_clock_freq();
3785 unsigned long flags
;
3786 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3787 struct timespec64 rts
= { 0, 0 };
3789 struct timespec rts
= { 0, 0 };
3792 /* Disable interrupts to increase correlation precision. */
3793 local_irq_save(flags
);
3794 monotonic
[0] = trace_clock_read64();
3795 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3796 ktime_get_real_ts64(&rts
);
3798 getnstimeofday(&rts
);
3800 monotonic
[1] = trace_clock_read64();
3801 local_irq_restore(flags
);
3803 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3804 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3805 if (tcf
== NSEC_PER_SEC
) {
3806 realtime
+= rts
.tv_nsec
;
3808 uint64_t n
= rts
.tv_nsec
* tcf
;
3810 do_div(n
, NSEC_PER_SEC
);
3813 offset
= (int64_t) realtime
- monotonic_avg
;
3818 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3826 while (cur
!= '\0') {
3829 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3833 ret
= lttng_metadata_printf(session
, "%c", '\\');
3836 /* We still print the current char */
3839 ret
= lttng_metadata_printf(session
, "%c", cur
);
3853 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3854 const char *field_value
)
3858 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3862 ret
= print_escaped_ctf_string(session
, field_value
);
3866 ret
= lttng_metadata_printf(session
, "\";\n");
3873 * Output metadata into this session's metadata buffers.
3874 * Must be called with sessions_mutex held.
3877 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3879 unsigned char *uuid_c
= session
->uuid
.b
;
3880 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3881 const char *product_uuid
;
3882 struct lttng_channel
*chan
;
3883 struct lttng_event
*event
;
3886 if (!LTTNG_READ_ONCE(session
->active
))
3889 lttng_metadata_begin(session
);
3891 if (session
->metadata_dumped
)
3894 snprintf(uuid_s
, sizeof(uuid_s
),
3895 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3896 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3897 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3898 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3899 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3901 ret
= lttng_metadata_printf(session
,
3902 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3903 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3904 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3905 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3906 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3907 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3908 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3914 " byte_order = %s;\n"
3915 " packet.header := struct {\n"
3916 " uint32_t magic;\n"
3917 " uint8_t uuid[16];\n"
3918 " uint32_t stream_id;\n"
3919 " uint64_t stream_instance_id;\n"
3922 lttng_alignof(uint8_t) * CHAR_BIT
,
3923 lttng_alignof(uint16_t) * CHAR_BIT
,
3924 lttng_alignof(uint32_t) * CHAR_BIT
,
3925 lttng_alignof(uint64_t) * CHAR_BIT
,
3926 sizeof(unsigned long) * CHAR_BIT
,
3927 lttng_alignof(unsigned long) * CHAR_BIT
,
3931 #if __BYTE_ORDER == __BIG_ENDIAN
3940 ret
= lttng_metadata_printf(session
,
3942 " hostname = \"%s\";\n"
3943 " domain = \"kernel\";\n"
3944 " sysname = \"%s\";\n"
3945 " kernel_release = \"%s\";\n"
3946 " kernel_version = \"%s\";\n"
3947 " tracer_name = \"lttng-modules\";\n"
3948 " tracer_major = %d;\n"
3949 " tracer_minor = %d;\n"
3950 " tracer_patchlevel = %d;\n"
3951 " trace_buffering_scheme = \"global\";\n",
3952 current
->nsproxy
->uts_ns
->name
.nodename
,
3956 LTTNG_MODULES_MAJOR_VERSION
,
3957 LTTNG_MODULES_MINOR_VERSION
,
3958 LTTNG_MODULES_PATCHLEVEL_VERSION
3963 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3966 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3967 session
->creation_time
);
3971 /* Add the product UUID to the 'env' section */
3972 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3974 ret
= lttng_metadata_printf(session
,
3975 " product_uuid = \"%s\";\n",
3982 /* Close the 'env' section */
3983 ret
= lttng_metadata_printf(session
, "};\n\n");
3987 ret
= lttng_metadata_printf(session
,
3989 " name = \"%s\";\n",
3995 if (!trace_clock_uuid(clock_uuid_s
)) {
3996 ret
= lttng_metadata_printf(session
,
3997 " uuid = \"%s\";\n",
4004 ret
= lttng_metadata_printf(session
,
4005 " description = \"%s\";\n"
4006 " freq = %llu; /* Frequency, in Hz */\n"
4007 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
4010 trace_clock_description(),
4011 (unsigned long long) trace_clock_freq(),
4012 (long long) measure_clock_offset()
4017 ret
= lttng_metadata_printf(session
,
4018 "typealias integer {\n"
4019 " size = 27; align = 1; signed = false;\n"
4020 " map = clock.%s.value;\n"
4021 "} := uint27_clock_monotonic_t;\n"
4023 "typealias integer {\n"
4024 " size = 32; align = %u; signed = false;\n"
4025 " map = clock.%s.value;\n"
4026 "} := uint32_clock_monotonic_t;\n"
4028 "typealias integer {\n"
4029 " size = 64; align = %u; signed = false;\n"
4030 " map = clock.%s.value;\n"
4031 "} := uint64_clock_monotonic_t;\n\n",
4033 lttng_alignof(uint32_t) * CHAR_BIT
,
4035 lttng_alignof(uint64_t) * CHAR_BIT
,
4041 ret
= _lttng_stream_packet_context_declare(session
);
4045 ret
= _lttng_event_header_declare(session
);
4050 list_for_each_entry(chan
, &session
->chan
, list
) {
4051 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4056 list_for_each_entry(event
, &session
->events
, list
) {
4057 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
4061 session
->metadata_dumped
= 1;
4063 lttng_metadata_end(session
);
4068 * lttng_transport_register - LTT transport registration
4069 * @transport: transport structure
4071 * Registers a transport which can be used as output to extract the data out of
4072 * LTTng. The module calling this registration function must ensure that no
4073 * trap-inducing code will be executed by the transport functions. E.g.
4074 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4075 * is made visible to the transport function. This registration acts as a
4076 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4077 * after its registration must it synchronize the TLBs.
4079 void lttng_transport_register(struct lttng_transport
*transport
)
4082 * Make sure no page fault can be triggered by the module about to be
4083 * registered. We deal with this here so we don't have to call
4084 * vmalloc_sync_mappings() in each module's init.
4086 wrapper_vmalloc_sync_mappings();
4088 mutex_lock(&sessions_mutex
);
4089 list_add_tail(&transport
->node
, <tng_transport_list
);
4090 mutex_unlock(&sessions_mutex
);
4092 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4095 * lttng_transport_unregister - LTT transport unregistration
4096 * @transport: transport structure
4098 void lttng_transport_unregister(struct lttng_transport
*transport
)
4100 mutex_lock(&sessions_mutex
);
4101 list_del(&transport
->node
);
4102 mutex_unlock(&sessions_mutex
);
4104 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4106 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4109 * Make sure no page fault can be triggered by the module about to be
4110 * registered. We deal with this here so we don't have to call
4111 * vmalloc_sync_mappings() in each module's init.
4113 wrapper_vmalloc_sync_mappings();
4115 mutex_lock(&sessions_mutex
);
4116 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4117 mutex_unlock(&sessions_mutex
);
4119 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4121 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4123 mutex_lock(&sessions_mutex
);
4124 list_del(&transport
->node
);
4125 mutex_unlock(&sessions_mutex
);
4127 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4129 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4131 enum cpuhp_state lttng_hp_prepare
;
4132 enum cpuhp_state lttng_hp_online
;
4134 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4136 struct lttng_cpuhp_node
*lttng_node
;
4138 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4139 switch (lttng_node
->component
) {
4140 case LTTNG_RING_BUFFER_FRONTEND
:
4142 case LTTNG_RING_BUFFER_BACKEND
:
4143 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4144 case LTTNG_RING_BUFFER_ITER
:
4146 case LTTNG_CONTEXT_PERF_COUNTERS
:
4153 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4155 struct lttng_cpuhp_node
*lttng_node
;
4157 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4158 switch (lttng_node
->component
) {
4159 case LTTNG_RING_BUFFER_FRONTEND
:
4160 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4161 case LTTNG_RING_BUFFER_BACKEND
:
4163 case LTTNG_RING_BUFFER_ITER
:
4165 case LTTNG_CONTEXT_PERF_COUNTERS
:
4166 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4172 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4174 struct lttng_cpuhp_node
*lttng_node
;
4176 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4177 switch (lttng_node
->component
) {
4178 case LTTNG_RING_BUFFER_FRONTEND
:
4179 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4180 case LTTNG_RING_BUFFER_BACKEND
:
4182 case LTTNG_RING_BUFFER_ITER
:
4183 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4184 case LTTNG_CONTEXT_PERF_COUNTERS
:
4185 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4191 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4193 struct lttng_cpuhp_node
*lttng_node
;
4195 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4196 switch (lttng_node
->component
) {
4197 case LTTNG_RING_BUFFER_FRONTEND
:
4198 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4199 case LTTNG_RING_BUFFER_BACKEND
:
4201 case LTTNG_RING_BUFFER_ITER
:
4203 case LTTNG_CONTEXT_PERF_COUNTERS
:
4210 static int __init
lttng_init_cpu_hotplug(void)
4214 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4215 lttng_hotplug_prepare
,
4216 lttng_hotplug_dead
);
4220 lttng_hp_prepare
= ret
;
4221 lttng_rb_set_hp_prepare(ret
);
4223 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4224 lttng_hotplug_online
,
4225 lttng_hotplug_offline
);
4227 cpuhp_remove_multi_state(lttng_hp_prepare
);
4228 lttng_hp_prepare
= 0;
4231 lttng_hp_online
= ret
;
4232 lttng_rb_set_hp_online(ret
);
4237 static void __exit
lttng_exit_cpu_hotplug(void)
4239 lttng_rb_set_hp_online(0);
4240 cpuhp_remove_multi_state(lttng_hp_online
);
4241 lttng_rb_set_hp_prepare(0);
4242 cpuhp_remove_multi_state(lttng_hp_prepare
);
4245 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4246 static int lttng_init_cpu_hotplug(void)
4250 static void lttng_exit_cpu_hotplug(void)
4253 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4256 static int __init
lttng_events_init(void)
4260 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4263 ret
= wrapper_get_pfnblock_flags_mask_init();
4266 ret
= wrapper_get_pageblock_flags_mask_init();
4269 ret
= lttng_probes_init();
4272 ret
= lttng_context_init();
4275 ret
= lttng_tracepoint_init();
4278 event_cache
= KMEM_CACHE(lttng_event
, 0);
4281 goto error_kmem_event
;
4283 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4284 if (!event_notifier_cache
) {
4286 goto error_kmem_event_notifier
;
4288 ret
= lttng_abi_init();
4291 ret
= lttng_logger_init();
4294 ret
= lttng_init_cpu_hotplug();
4297 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4298 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4299 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4300 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4301 LTTNG_MODULES_EXTRAVERSION
,
4303 #ifdef LTTNG_EXTRA_VERSION_GIT
4304 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4308 #ifdef LTTNG_EXTRA_VERSION_NAME
4309 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4316 lttng_logger_exit();
4320 kmem_cache_destroy(event_notifier_cache
);
4321 error_kmem_event_notifier
:
4322 kmem_cache_destroy(event_cache
);
4324 lttng_tracepoint_exit();
4326 lttng_context_exit();
4327 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4328 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4329 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4330 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4331 LTTNG_MODULES_EXTRAVERSION
,
4333 #ifdef LTTNG_EXTRA_VERSION_GIT
4334 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4338 #ifdef LTTNG_EXTRA_VERSION_NAME
4339 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4346 module_init(lttng_events_init
);
4348 static void __exit
lttng_events_exit(void)
4350 struct lttng_session
*session
, *tmpsession
;
4352 lttng_exit_cpu_hotplug();
4353 lttng_logger_exit();
4355 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4356 lttng_session_destroy(session
);
4357 kmem_cache_destroy(event_cache
);
4358 kmem_cache_destroy(event_notifier_cache
);
4359 lttng_tracepoint_exit();
4360 lttng_context_exit();
4361 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4362 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4363 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4364 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4365 LTTNG_MODULES_EXTRAVERSION
,
4367 #ifdef LTTNG_EXTRA_VERSION_GIT
4368 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4372 #ifdef LTTNG_EXTRA_VERSION_NAME
4373 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4379 module_exit(lttng_events_exit
);
4381 #include <generated/patches.h>
4382 #ifdef LTTNG_EXTRA_VERSION_GIT
4383 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4385 #ifdef LTTNG_EXTRA_VERSION_NAME
4386 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4388 MODULE_LICENSE("GPL and additional rights");
4389 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4390 MODULE_DESCRIPTION("LTTng tracer");
4391 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4392 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4393 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4394 LTTNG_MODULES_EXTRAVERSION
);