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_ABI_TRACEPOINT
: /* Fall-through */
620 case LTTNG_KERNEL_ABI_SYSCALL
:
624 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
625 case LTTNG_KERNEL_ABI_UPROBE
:
626 WRITE_ONCE(event
->enabled
, 1);
629 case LTTNG_KERNEL_ABI_KRETPROBE
:
630 ret
= lttng_kretprobes_event_enable_state(event
, 1);
633 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
634 case LTTNG_KERNEL_ABI_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_ABI_TRACEPOINT
: /* Fall-through */
659 case LTTNG_KERNEL_ABI_SYSCALL
:
663 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
664 case LTTNG_KERNEL_ABI_UPROBE
:
665 WRITE_ONCE(event
->enabled
, 0);
668 case LTTNG_KERNEL_ABI_KRETPROBE
:
670 ret
= lttng_kretprobes_event_enable_state(event
, 0);
673 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
674 case LTTNG_KERNEL_ABI_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_ABI_TRACEPOINT
: /* Fall-through */
695 case LTTNG_KERNEL_ABI_SYSCALL
:
699 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
700 case LTTNG_KERNEL_ABI_UPROBE
:
701 WRITE_ONCE(event_notifier
->enabled
, 1);
704 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
705 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
706 case LTTNG_KERNEL_ABI_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_ABI_TRACEPOINT
: /* Fall-through */
727 case LTTNG_KERNEL_ABI_SYSCALL
:
731 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
732 case LTTNG_KERNEL_ABI_UPROBE
:
733 WRITE_ONCE(event_notifier
->enabled
, 0);
736 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
737 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
738 case LTTNG_KERNEL_ABI_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_abi_event
*event_param
,
848 const struct lttng_kernel_event_desc
*event_desc
,
849 enum lttng_kernel_abi_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_ABI_TRACEPOINT
:
864 event_name
= event_desc
->event_name
;
867 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
868 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
869 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
870 case LTTNG_KERNEL_ABI_SYSCALL
:
871 event_name
= event_param
->name
;
874 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
875 case LTTNG_KERNEL_ABI_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_ABI_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 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
904 INIT_LIST_HEAD(&event
->enablers_ref_head
);
907 case LTTNG_KERNEL_ABI_TRACEPOINT
:
908 /* Event will be enabled by enabler sync. */
910 event
->registered
= 0;
911 event
->desc
= lttng_event_desc_get(event_name
);
916 /* Populate lttng_event structure before event registration. */
920 case LTTNG_KERNEL_ABI_KPROBE
:
922 * Needs to be explicitly enabled after creation, since
923 * we may want to apply filters.
926 event
->registered
= 1;
928 * Populate lttng_event structure before event
932 ret
= lttng_kprobes_register_event(event_name
,
933 event_param
->u
.kprobe
.symbol_name
,
934 event_param
->u
.kprobe
.offset
,
935 event_param
->u
.kprobe
.addr
,
941 ret
= try_module_get(event
->desc
->owner
);
945 case LTTNG_KERNEL_ABI_KRETPROBE
:
947 struct lttng_event
*event_return
;
949 /* kretprobe defines 2 events */
951 * Needs to be explicitly enabled after creation, since
952 * we may want to apply filters.
955 event
->registered
= 1;
957 kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
962 event_return
->chan
= chan
;
963 event_return
->filter
= filter
;
964 event_return
->id
= chan
->free_event_id
++;
965 event_return
->enabled
= 0;
966 event_return
->registered
= 1;
967 event_return
->instrumentation
= itype
;
968 INIT_LIST_HEAD(&event_return
->filter_bytecode_runtime_head
);
969 INIT_LIST_HEAD(&event_return
->enablers_ref_head
);
971 * Populate lttng_event structure before kretprobe registration.
974 ret
= lttng_kretprobes_register(event_name
,
975 event_param
->u
.kretprobe
.symbol_name
,
976 event_param
->u
.kretprobe
.offset
,
977 event_param
->u
.kretprobe
.addr
,
978 event
, event_return
);
980 kmem_cache_free(event_cache
, event_return
);
984 /* Take 2 refs on the module: one per event. */
985 ret
= try_module_get(event
->desc
->owner
);
987 ret
= try_module_get(event
->desc
->owner
);
989 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
,
991 WARN_ON_ONCE(ret
> 0);
993 kmem_cache_free(event_cache
, event_return
);
994 module_put(event
->desc
->owner
);
995 module_put(event
->desc
->owner
);
996 goto statedump_error
;
998 list_add(&event_return
->list
, &chan
->session
->events
);
1002 case LTTNG_KERNEL_ABI_SYSCALL
:
1004 * Needs to be explicitly enabled after creation, since
1005 * we may want to apply filters.
1008 event
->registered
= 0;
1009 event
->desc
= event_desc
;
1010 switch (event_param
->u
.syscall
.entryexit
) {
1011 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1013 goto register_error
;
1014 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1015 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1017 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1018 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1021 switch (event_param
->u
.syscall
.abi
) {
1022 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1024 goto register_error
;
1025 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1026 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1028 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1029 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1034 goto register_error
;
1038 case LTTNG_KERNEL_ABI_UPROBE
:
1040 * Needs to be explicitly enabled after creation, since
1041 * we may want to apply filters.
1044 event
->registered
= 1;
1047 * Populate lttng_event structure before event
1052 ret
= lttng_uprobes_register_event(event_param
->name
,
1053 event_param
->u
.uprobe
.fd
,
1056 goto register_error
;
1057 ret
= try_module_get(event
->desc
->owner
);
1061 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1062 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1066 goto register_error
;
1068 ret
= _lttng_event_metadata_statedump(chan
->session
, chan
, event
);
1069 WARN_ON_ONCE(ret
> 0);
1071 goto statedump_error
;
1073 hlist_add_head(&event
->hlist
, head
);
1074 list_add(&event
->list
, &chan
->session
->events
);
1078 /* If a statedump error occurs, events will not be readable. */
1080 kmem_cache_free(event_cache
, event
);
1085 return ERR_PTR(ret
);
1088 struct lttng_event_notifier
*_lttng_event_notifier_create(
1089 const struct lttng_kernel_event_desc
*event_desc
,
1090 uint64_t token
, uint64_t error_counter_index
,
1091 struct lttng_event_notifier_group
*event_notifier_group
,
1092 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1093 void *filter
, enum lttng_kernel_abi_instrumentation itype
)
1095 struct lttng_event_notifier
*event_notifier
;
1096 struct lttng_counter
*error_counter
;
1097 const char *event_name
;
1098 struct hlist_head
*head
;
1102 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1103 event_name
= event_desc
->event_name
;
1106 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1107 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1108 case LTTNG_KERNEL_ABI_SYSCALL
:
1109 event_name
= event_notifier_param
->event
.name
;
1112 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1113 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1114 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1121 head
= utils_borrow_hash_table_bucket(event_notifier_group
->event_notifiers_ht
.table
,
1122 LTTNG_EVENT_NOTIFIER_HT_SIZE
, event_name
);
1123 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
1124 WARN_ON_ONCE(!event_notifier
->desc
);
1125 if (!strncmp(event_notifier
->desc
->event_name
, event_name
,
1126 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1)
1127 && event_notifier_group
== event_notifier
->group
1128 && token
== event_notifier
->user_token
) {
1134 event_notifier
= kmem_cache_zalloc(event_notifier_cache
, GFP_KERNEL
);
1135 if (!event_notifier
) {
1140 event_notifier
->group
= event_notifier_group
;
1141 event_notifier
->user_token
= token
;
1142 event_notifier
->error_counter_index
= error_counter_index
;
1143 event_notifier
->num_captures
= 0;
1144 event_notifier
->filter
= filter
;
1145 event_notifier
->instrumentation
= itype
;
1146 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1147 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1148 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1149 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1152 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1153 /* Event will be enabled by enabler sync. */
1154 event_notifier
->enabled
= 0;
1155 event_notifier
->registered
= 0;
1156 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1157 if (!event_notifier
->desc
) {
1159 goto register_error
;
1161 /* Populate lttng_event_notifier structure before event registration. */
1165 case LTTNG_KERNEL_ABI_KPROBE
:
1167 * Needs to be explicitly enabled after creation, since
1168 * we may want to apply filters.
1170 event_notifier
->enabled
= 0;
1171 event_notifier
->registered
= 1;
1173 * Populate lttng_event_notifier structure before event
1177 ret
= lttng_kprobes_register_event_notifier(
1178 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1179 event_notifier_param
->event
.u
.kprobe
.offset
,
1180 event_notifier_param
->event
.u
.kprobe
.addr
,
1184 goto register_error
;
1186 ret
= try_module_get(event_notifier
->desc
->owner
);
1190 case LTTNG_KERNEL_ABI_SYSCALL
:
1192 * Needs to be explicitly enabled after creation, since
1193 * we may want to apply filters.
1195 event_notifier
->enabled
= 0;
1196 event_notifier
->registered
= 0;
1197 event_notifier
->desc
= event_desc
;
1198 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1199 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1201 goto register_error
;
1202 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1203 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1205 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1206 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1209 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1210 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1212 goto register_error
;
1213 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1214 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1216 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1217 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1221 if (!event_notifier
->desc
) {
1223 goto register_error
;
1227 case LTTNG_KERNEL_ABI_UPROBE
:
1229 * Needs to be explicitly enabled after creation, since
1230 * we may want to apply filters.
1232 event_notifier
->enabled
= 0;
1233 event_notifier
->registered
= 1;
1236 * Populate lttng_event_notifier structure before
1237 * event_notifier registration.
1241 ret
= lttng_uprobes_register_event_notifier(
1242 event_notifier_param
->event
.name
,
1243 event_notifier_param
->event
.u
.uprobe
.fd
,
1246 goto register_error
;
1247 ret
= try_module_get(event_notifier
->desc
->owner
);
1251 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1252 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1253 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1257 goto register_error
;
1260 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1261 hlist_add_head(&event_notifier
->hlist
, head
);
1264 * Clear the error counter bucket. The sessiond keeps track of which
1265 * bucket is currently in use. We trust it. The session lock
1266 * synchronizes against concurrent creation of the error
1269 error_counter
= event_notifier_group
->error_counter
;
1270 if (error_counter
) {
1271 size_t dimension_index
[1];
1274 * Check that the index is within the boundary of the counter.
1276 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1277 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1278 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1280 goto register_error
;
1283 dimension_index
[0] = event_notifier
->error_counter_index
;
1284 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1286 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1287 event_notifier
->error_counter_index
);
1288 goto register_error
;
1292 return event_notifier
;
1295 kmem_cache_free(event_notifier_cache
, event_notifier
);
1299 return ERR_PTR(ret
);
1302 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1303 const size_t *dim_indexes
, int32_t cpu
,
1304 int64_t *val
, bool *overflow
, bool *underflow
)
1306 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1307 cpu
, val
, overflow
, underflow
);
1310 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1311 const size_t *dim_indexes
, int64_t *val
,
1312 bool *overflow
, bool *underflow
)
1314 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1315 val
, overflow
, underflow
);
1318 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1319 const size_t *dim_indexes
)
1321 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1324 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1325 struct lttng_kernel_abi_event
*event_param
,
1327 const struct lttng_kernel_event_desc
*event_desc
,
1328 enum lttng_kernel_abi_instrumentation itype
)
1330 struct lttng_event
*event
;
1332 mutex_lock(&sessions_mutex
);
1333 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1335 mutex_unlock(&sessions_mutex
);
1339 struct lttng_event_notifier
*lttng_event_notifier_create(
1340 const struct lttng_kernel_event_desc
*event_desc
,
1341 uint64_t id
, uint64_t error_counter_index
,
1342 struct lttng_event_notifier_group
*event_notifier_group
,
1343 struct lttng_kernel_abi_event_notifier
*event_notifier_param
,
1344 void *filter
, enum lttng_kernel_abi_instrumentation itype
)
1346 struct lttng_event_notifier
*event_notifier
;
1348 mutex_lock(&sessions_mutex
);
1349 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1350 error_counter_index
, event_notifier_group
,
1351 event_notifier_param
, filter
, itype
);
1352 mutex_unlock(&sessions_mutex
);
1353 return event_notifier
;
1356 /* Only used for tracepoints for now. */
1358 void register_event(struct lttng_event
*event
)
1360 const struct lttng_kernel_event_desc
*desc
;
1363 if (event
->registered
)
1367 switch (event
->instrumentation
) {
1368 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1369 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1370 desc
->probe_callback
,
1374 case LTTNG_KERNEL_ABI_SYSCALL
:
1375 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1378 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1379 case LTTNG_KERNEL_ABI_UPROBE
: /* Fall-through */
1380 case LTTNG_KERNEL_ABI_KRETPROBE
:
1384 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1385 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1390 event
->registered
= 1;
1394 * Only used internally at session destruction.
1396 int _lttng_event_unregister(struct lttng_event
*event
)
1398 const struct lttng_kernel_event_desc
*desc
;
1401 if (!event
->registered
)
1405 switch (event
->instrumentation
) {
1406 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1407 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->event_kname
,
1408 event
->desc
->probe_callback
,
1412 case LTTNG_KERNEL_ABI_KPROBE
:
1413 lttng_kprobes_unregister_event(event
);
1417 case LTTNG_KERNEL_ABI_KRETPROBE
:
1418 lttng_kretprobes_unregister(event
);
1422 case LTTNG_KERNEL_ABI_SYSCALL
:
1423 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1426 case LTTNG_KERNEL_ABI_NOOP
:
1430 case LTTNG_KERNEL_ABI_UPROBE
:
1431 lttng_uprobes_unregister_event(event
);
1435 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1440 event
->registered
= 0;
1444 /* Only used for tracepoints for now. */
1446 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1448 const struct lttng_kernel_event_desc
*desc
;
1451 if (event_notifier
->registered
)
1454 desc
= event_notifier
->desc
;
1455 switch (event_notifier
->instrumentation
) {
1456 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1457 ret
= lttng_wrapper_tracepoint_probe_register(desc
->event_kname
,
1458 desc
->event_notifier_callback
,
1462 case LTTNG_KERNEL_ABI_SYSCALL
:
1463 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1466 case LTTNG_KERNEL_ABI_KPROBE
: /* Fall-through */
1467 case LTTNG_KERNEL_ABI_UPROBE
:
1471 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1472 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1473 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1478 event_notifier
->registered
= 1;
1482 int _lttng_event_notifier_unregister(
1483 struct lttng_event_notifier
*event_notifier
)
1485 const struct lttng_kernel_event_desc
*desc
;
1488 if (!event_notifier
->registered
)
1491 desc
= event_notifier
->desc
;
1492 switch (event_notifier
->instrumentation
) {
1493 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1494 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->event_kname
,
1495 event_notifier
->desc
->event_notifier_callback
,
1499 case LTTNG_KERNEL_ABI_KPROBE
:
1500 lttng_kprobes_unregister_event_notifier(event_notifier
);
1504 case LTTNG_KERNEL_ABI_UPROBE
:
1505 lttng_uprobes_unregister_event_notifier(event_notifier
);
1509 case LTTNG_KERNEL_ABI_SYSCALL
:
1510 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1513 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1514 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1515 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1520 event_notifier
->registered
= 0;
1525 * Only used internally at session destruction.
1528 void _lttng_event_destroy(struct lttng_event
*event
)
1530 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1532 switch (event
->instrumentation
) {
1533 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1534 lttng_event_desc_put(event
->desc
);
1537 case LTTNG_KERNEL_ABI_KPROBE
:
1538 module_put(event
->desc
->owner
);
1539 lttng_kprobes_destroy_event_private(event
);
1542 case LTTNG_KERNEL_ABI_KRETPROBE
:
1543 module_put(event
->desc
->owner
);
1544 lttng_kretprobes_destroy_private(event
);
1547 case LTTNG_KERNEL_ABI_SYSCALL
:
1550 case LTTNG_KERNEL_ABI_UPROBE
:
1551 module_put(event
->desc
->owner
);
1552 lttng_uprobes_destroy_event_private(event
);
1555 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1556 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1560 list_del(&event
->list
);
1561 lttng_kernel_destroy_context(event
->ctx
);
1562 lttng_free_event_filter_runtime(event
);
1563 /* Free event enabler refs */
1564 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1565 &event
->enablers_ref_head
, node
)
1567 kmem_cache_free(event_cache
, event
);
1571 * Only used internally at session destruction.
1574 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1576 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1578 switch (event_notifier
->instrumentation
) {
1579 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1580 lttng_event_desc_put(event_notifier
->desc
);
1583 case LTTNG_KERNEL_ABI_KPROBE
:
1584 module_put(event_notifier
->desc
->owner
);
1585 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1588 case LTTNG_KERNEL_ABI_SYSCALL
:
1591 case LTTNG_KERNEL_ABI_UPROBE
:
1592 module_put(event_notifier
->desc
->owner
);
1593 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1596 case LTTNG_KERNEL_ABI_KRETPROBE
: /* Fall-through */
1597 case LTTNG_KERNEL_ABI_FUNCTION
: /* Fall-through */
1598 case LTTNG_KERNEL_ABI_NOOP
: /* Fall-through */
1602 list_del(&event_notifier
->list
);
1603 lttng_free_event_notifier_filter_runtime(event_notifier
);
1604 /* Free event enabler refs */
1605 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1606 &event_notifier
->enablers_ref_head
, node
)
1608 kmem_cache_free(event_notifier_cache
, event_notifier
);
1611 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1612 enum tracker_type tracker_type
)
1614 switch (tracker_type
) {
1616 return &session
->pid_tracker
;
1618 return &session
->vpid_tracker
;
1620 return &session
->uid_tracker
;
1622 return &session
->vuid_tracker
;
1624 return &session
->gid_tracker
;
1626 return &session
->vgid_tracker
;
1633 int lttng_session_track_id(struct lttng_session
*session
,
1634 enum tracker_type tracker_type
, int id
)
1636 struct lttng_id_tracker
*tracker
;
1639 tracker
= get_tracker(session
, tracker_type
);
1644 mutex_lock(&sessions_mutex
);
1646 /* track all ids: destroy tracker. */
1647 lttng_id_tracker_destroy(tracker
, true);
1650 ret
= lttng_id_tracker_add(tracker
, id
);
1652 mutex_unlock(&sessions_mutex
);
1656 int lttng_session_untrack_id(struct lttng_session
*session
,
1657 enum tracker_type tracker_type
, int id
)
1659 struct lttng_id_tracker
*tracker
;
1662 tracker
= get_tracker(session
, tracker_type
);
1667 mutex_lock(&sessions_mutex
);
1669 /* untrack all ids: replace by empty tracker. */
1670 ret
= lttng_id_tracker_empty_set(tracker
);
1672 ret
= lttng_id_tracker_del(tracker
, id
);
1674 mutex_unlock(&sessions_mutex
);
1679 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1681 struct lttng_id_tracker
*id_tracker
= m
->private;
1682 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1683 struct lttng_id_hash_node
*e
;
1686 mutex_lock(&sessions_mutex
);
1688 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1689 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1691 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1697 /* ID tracker disabled. */
1698 if (iter
>= *pos
&& iter
== 0) {
1699 return id_tracker_p
; /* empty tracker */
1707 /* Called with sessions_mutex held. */
1709 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1711 struct lttng_id_tracker
*id_tracker
= m
->private;
1712 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1713 struct lttng_id_hash_node
*e
;
1718 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1719 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1721 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1722 if (iter
++ >= *ppos
)
1727 /* ID tracker disabled. */
1728 if (iter
>= *ppos
&& iter
== 0)
1729 return p
; /* empty tracker */
1738 void id_list_stop(struct seq_file
*m
, void *p
)
1740 mutex_unlock(&sessions_mutex
);
1744 int id_list_show(struct seq_file
*m
, void *p
)
1746 struct lttng_id_tracker
*id_tracker
= m
->private;
1747 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1750 if (p
== id_tracker_p
) {
1751 /* Tracker disabled. */
1754 const struct lttng_id_hash_node
*e
= p
;
1756 id
= lttng_id_tracker_get_node_id(e
);
1758 switch (id_tracker
->tracker_type
) {
1760 seq_printf(m
, "process { pid = %d; };\n", id
);
1763 seq_printf(m
, "process { vpid = %d; };\n", id
);
1766 seq_printf(m
, "user { uid = %d; };\n", id
);
1769 seq_printf(m
, "user { vuid = %d; };\n", id
);
1772 seq_printf(m
, "group { gid = %d; };\n", id
);
1775 seq_printf(m
, "group { vgid = %d; };\n", id
);
1778 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1784 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1785 .start
= id_list_start
,
1786 .next
= id_list_next
,
1787 .stop
= id_list_stop
,
1788 .show
= id_list_show
,
1792 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1794 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1798 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1800 struct seq_file
*m
= file
->private_data
;
1801 struct lttng_id_tracker
*id_tracker
= m
->private;
1804 WARN_ON_ONCE(!id_tracker
);
1805 ret
= seq_release(inode
, file
);
1807 fput(id_tracker
->session
->file
);
1811 const struct file_operations lttng_tracker_ids_list_fops
= {
1812 .owner
= THIS_MODULE
,
1813 .open
= lttng_tracker_ids_list_open
,
1815 .llseek
= seq_lseek
,
1816 .release
= lttng_tracker_ids_list_release
,
1819 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1820 enum tracker_type tracker_type
)
1822 struct file
*tracker_ids_list_file
;
1826 file_fd
= lttng_get_unused_fd();
1832 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1833 <tng_tracker_ids_list_fops
,
1835 if (IS_ERR(tracker_ids_list_file
)) {
1836 ret
= PTR_ERR(tracker_ids_list_file
);
1839 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1841 goto refcount_error
;
1843 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1846 m
= tracker_ids_list_file
->private_data
;
1848 m
->private = get_tracker(session
, tracker_type
);
1849 BUG_ON(!m
->private);
1850 fd_install(file_fd
, tracker_ids_list_file
);
1855 atomic_long_dec(&session
->file
->f_count
);
1857 fput(tracker_ids_list_file
);
1859 put_unused_fd(file_fd
);
1865 * Enabler management.
1868 int lttng_match_enabler_star_glob(const char *desc_name
,
1869 const char *pattern
)
1871 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1872 desc_name
, LTTNG_SIZE_MAX
))
1878 int lttng_match_enabler_name(const char *desc_name
,
1881 if (strcmp(desc_name
, name
))
1886 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc
*desc
,
1887 struct lttng_enabler
*enabler
)
1889 const char *desc_name
, *enabler_name
;
1890 bool compat
= false, entry
= false;
1892 enabler_name
= enabler
->event_param
.name
;
1893 switch (enabler
->event_param
.instrumentation
) {
1894 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1895 desc_name
= desc
->event_name
;
1896 switch (enabler
->format_type
) {
1897 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1898 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1899 case LTTNG_ENABLER_FORMAT_NAME
:
1900 return lttng_match_enabler_name(desc_name
, enabler_name
);
1906 case LTTNG_KERNEL_ABI_SYSCALL
:
1907 desc_name
= desc
->event_name
;
1908 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1909 desc_name
+= strlen("compat_");
1912 if (!strncmp(desc_name
, "syscall_exit_",
1913 strlen("syscall_exit_"))) {
1914 desc_name
+= strlen("syscall_exit_");
1915 } else if (!strncmp(desc_name
, "syscall_entry_",
1916 strlen("syscall_entry_"))) {
1917 desc_name
+= strlen("syscall_entry_");
1923 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1924 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1926 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1930 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1937 switch (enabler
->event_param
.u
.syscall
.abi
) {
1938 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1940 case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
:
1944 case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
:
1951 switch (enabler
->event_param
.u
.syscall
.match
) {
1952 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1953 switch (enabler
->format_type
) {
1954 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1955 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1956 case LTTNG_ENABLER_FORMAT_NAME
:
1957 return lttng_match_enabler_name(desc_name
, enabler_name
);
1962 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR
:
1963 return -EINVAL
; /* Not implemented. */
1976 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1977 struct lttng_event
*event
)
1979 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1982 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1984 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1985 && event
->chan
== event_enabler
->chan
)
1992 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1993 struct lttng_event_notifier
*event_notifier
)
1995 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1996 event_notifier_enabler
);
1998 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
2000 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
2001 && event_notifier
->group
== event_notifier_enabler
->group
2002 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2009 struct lttng_enabler_ref
*lttng_enabler_ref(
2010 struct list_head
*enablers_ref_list
,
2011 struct lttng_enabler
*enabler
)
2013 struct lttng_enabler_ref
*enabler_ref
;
2015 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2016 if (enabler_ref
->ref
== enabler
)
2023 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2025 struct lttng_session
*session
= event_enabler
->chan
->session
;
2026 struct lttng_kernel_probe_desc
*probe_desc
;
2027 const struct lttng_kernel_event_desc
*desc
;
2029 struct list_head
*probe_list
;
2031 probe_list
= lttng_get_probe_list_head();
2033 * For each probe event, if we find that a probe event matches
2034 * our enabler, create an associated lttng_event if not
2037 list_for_each_entry(probe_desc
, probe_list
, head
) {
2038 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2040 struct hlist_head
*head
;
2041 struct lttng_event
*event
;
2043 desc
= probe_desc
->event_desc
[i
];
2044 if (!lttng_desc_match_enabler(desc
,
2045 lttng_event_enabler_as_enabler(event_enabler
)))
2049 * Check if already created.
2051 head
= utils_borrow_hash_table_bucket(
2052 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2054 lttng_hlist_for_each_entry(event
, head
, hlist
) {
2055 if (event
->desc
== desc
2056 && event
->chan
== event_enabler
->chan
)
2063 * We need to create an event for this
2066 event
= _lttng_event_create(event_enabler
->chan
,
2068 LTTNG_KERNEL_ABI_TRACEPOINT
);
2070 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2071 probe_desc
->event_desc
[i
]->event_name
);
2078 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2080 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2081 struct lttng_kernel_probe_desc
*probe_desc
;
2082 const struct lttng_kernel_event_desc
*desc
;
2084 struct list_head
*probe_list
;
2086 probe_list
= lttng_get_probe_list_head();
2088 * For each probe event, if we find that a probe event matches
2089 * our enabler, create an associated lttng_event_notifier if not
2092 list_for_each_entry(probe_desc
, probe_list
, head
) {
2093 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2095 struct hlist_head
*head
;
2096 struct lttng_event_notifier
*event_notifier
;
2098 desc
= probe_desc
->event_desc
[i
];
2099 if (!lttng_desc_match_enabler(desc
,
2100 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2104 * Check if already created.
2106 head
= utils_borrow_hash_table_bucket(
2107 event_notifier_group
->event_notifiers_ht
.table
,
2108 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
2109 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2110 if (event_notifier
->desc
== desc
2111 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2118 * We need to create a event_notifier for this event probe.
2120 event_notifier
= _lttng_event_notifier_create(desc
,
2121 event_notifier_enabler
->base
.user_token
,
2122 event_notifier_enabler
->error_counter_index
,
2123 event_notifier_group
, NULL
, NULL
,
2124 LTTNG_KERNEL_ABI_TRACEPOINT
);
2125 if (IS_ERR(event_notifier
)) {
2126 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2127 probe_desc
->event_desc
[i
]->event_name
);
2134 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2138 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2143 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2147 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2149 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2154 * Create struct lttng_event if it is missing and present in the list of
2155 * tracepoint probes.
2156 * Should be called with sessions mutex held.
2159 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2161 switch (event_enabler
->base
.event_param
.instrumentation
) {
2162 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2163 lttng_create_tracepoint_event_if_missing(event_enabler
);
2166 case LTTNG_KERNEL_ABI_SYSCALL
:
2167 lttng_create_syscall_event_if_missing(event_enabler
);
2177 * Create events associated with an event_enabler (if not already present),
2178 * and add backward reference from the event to the enabler.
2179 * Should be called with sessions mutex held.
2182 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2184 struct lttng_channel
*chan
= event_enabler
->chan
;
2185 struct lttng_session
*session
= event_enabler
->chan
->session
;
2186 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2187 struct lttng_event
*event
;
2189 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2190 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2191 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2192 !strcmp(base_enabler
->event_param
.name
, "*")) {
2193 int enabled
= base_enabler
->enabled
;
2194 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2196 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2197 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2199 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2200 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2203 /* First ensure that probe events are created for this enabler. */
2204 lttng_create_event_if_missing(event_enabler
);
2206 /* For each event matching event_enabler in session event list. */
2207 list_for_each_entry(event
, &session
->events
, list
) {
2208 struct lttng_enabler_ref
*enabler_ref
;
2210 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2212 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2213 lttng_event_enabler_as_enabler(event_enabler
));
2216 * If no backward ref, create it.
2217 * Add backward ref from event to event_enabler.
2219 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2222 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2223 list_add(&enabler_ref
->node
,
2224 &event
->enablers_ref_head
);
2228 * Link filter bytecodes if not linked yet.
2230 lttng_enabler_link_bytecode(event
->desc
,
2232 &event
->filter_bytecode_runtime_head
,
2233 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2235 /* TODO: merge event context. */
2241 * Create struct lttng_event_notifier if it is missing and present in the list of
2242 * tracepoint probes.
2243 * Should be called with sessions mutex held.
2246 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2248 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2249 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2250 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2253 case LTTNG_KERNEL_ABI_SYSCALL
:
2254 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2264 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2267 int lttng_event_notifier_enabler_ref_event_notifiers(
2268 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2270 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2271 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2272 struct lttng_event_notifier
*event_notifier
;
2274 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_ABI_SYSCALL
&&
2275 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
&&
2276 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
&&
2277 !strcmp(base_enabler
->event_param
.name
, "*")) {
2279 int enabled
= base_enabler
->enabled
;
2280 enum lttng_kernel_abi_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2282 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2283 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2285 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
2286 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2290 /* First ensure that probe event_notifiers are created for this enabler. */
2291 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2293 /* Link the created event_notifier with its associated enabler. */
2294 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2295 struct lttng_enabler_ref
*enabler_ref
;
2297 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2300 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2301 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2304 * If no backward ref, create it.
2305 * Add backward ref from event_notifier to enabler.
2307 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2311 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2312 event_notifier_enabler
);
2313 list_add(&enabler_ref
->node
,
2314 &event_notifier
->enablers_ref_head
);
2318 * Link filter bytecodes if not linked yet.
2320 lttng_enabler_link_bytecode(event_notifier
->desc
,
2321 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2322 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2324 /* Link capture bytecodes if not linked yet. */
2325 lttng_enabler_link_bytecode(event_notifier
->desc
,
2326 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2327 &event_notifier_enabler
->capture_bytecode_head
);
2329 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2335 * Called at module load: connect the probe on all enablers matching
2337 * Called with sessions lock held.
2339 int lttng_fix_pending_events(void)
2341 struct lttng_session
*session
;
2343 list_for_each_entry(session
, &sessions
, list
)
2344 lttng_session_lazy_sync_event_enablers(session
);
2348 static bool lttng_event_notifier_group_has_active_event_notifiers(
2349 struct lttng_event_notifier_group
*event_notifier_group
)
2351 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2353 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2355 if (event_notifier_enabler
->base
.enabled
)
2361 bool lttng_event_notifier_active(void)
2363 struct lttng_event_notifier_group
*event_notifier_group
;
2365 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2366 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2372 int lttng_fix_pending_event_notifiers(void)
2374 struct lttng_event_notifier_group
*event_notifier_group
;
2376 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2377 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2381 struct lttng_event_enabler
*lttng_event_enabler_create(
2382 enum lttng_enabler_format_type format_type
,
2383 struct lttng_kernel_abi_event
*event_param
,
2384 struct lttng_channel
*chan
)
2386 struct lttng_event_enabler
*event_enabler
;
2388 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2391 event_enabler
->base
.format_type
= format_type
;
2392 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2393 memcpy(&event_enabler
->base
.event_param
, event_param
,
2394 sizeof(event_enabler
->base
.event_param
));
2395 event_enabler
->chan
= chan
;
2397 event_enabler
->base
.enabled
= 0;
2398 mutex_lock(&sessions_mutex
);
2399 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2400 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2401 mutex_unlock(&sessions_mutex
);
2402 return event_enabler
;
2405 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2407 mutex_lock(&sessions_mutex
);
2408 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2409 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2410 mutex_unlock(&sessions_mutex
);
2414 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2416 mutex_lock(&sessions_mutex
);
2417 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2418 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2419 mutex_unlock(&sessions_mutex
);
2424 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2425 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2427 struct lttng_bytecode_node
*bytecode_node
;
2428 uint32_t bytecode_len
;
2431 ret
= get_user(bytecode_len
, &bytecode
->len
);
2434 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2438 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2439 sizeof(*bytecode
) + bytecode_len
);
2443 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2444 bytecode_node
->enabler
= enabler
;
2445 /* Enforce length based on allocated size */
2446 bytecode_node
->bc
.len
= bytecode_len
;
2447 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2452 lttng_kvfree(bytecode_node
);
2456 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2457 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2460 ret
= lttng_enabler_attach_filter_bytecode(
2461 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2465 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2472 int lttng_event_add_callsite(struct lttng_event
*event
,
2473 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2476 switch (event
->instrumentation
) {
2477 case LTTNG_KERNEL_ABI_UPROBE
:
2478 return lttng_uprobes_event_add_callsite(event
, callsite
);
2485 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2487 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2489 /* Destroy filter bytecode */
2490 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2491 &enabler
->filter_bytecode_head
, node
) {
2492 lttng_kvfree(filter_node
);
2497 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2499 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2501 /* Destroy contexts */
2502 lttng_kernel_destroy_context(event_enabler
->ctx
);
2504 list_del(&event_enabler
->node
);
2505 kfree(event_enabler
);
2508 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2509 struct lttng_event_notifier_group
*event_notifier_group
,
2510 enum lttng_enabler_format_type format_type
,
2511 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2513 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2515 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2516 if (!event_notifier_enabler
)
2519 event_notifier_enabler
->base
.format_type
= format_type
;
2520 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2521 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2523 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2524 event_notifier_enabler
->num_captures
= 0;
2526 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2527 sizeof(event_notifier_enabler
->base
.event_param
));
2529 event_notifier_enabler
->base
.enabled
= 0;
2530 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2531 event_notifier_enabler
->group
= event_notifier_group
;
2533 mutex_lock(&sessions_mutex
);
2534 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2535 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2537 mutex_unlock(&sessions_mutex
);
2539 return event_notifier_enabler
;
2542 int lttng_event_notifier_enabler_enable(
2543 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2545 mutex_lock(&sessions_mutex
);
2546 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2547 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2548 mutex_unlock(&sessions_mutex
);
2552 int lttng_event_notifier_enabler_disable(
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
= 0;
2557 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2558 mutex_unlock(&sessions_mutex
);
2562 int lttng_event_notifier_enabler_attach_filter_bytecode(
2563 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2564 struct lttng_kernel_abi_filter_bytecode __user
*bytecode
)
2568 ret
= lttng_enabler_attach_filter_bytecode(
2569 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2574 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2581 int lttng_event_notifier_enabler_attach_capture_bytecode(
2582 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2583 struct lttng_kernel_abi_capture_bytecode __user
*bytecode
)
2585 struct lttng_bytecode_node
*bytecode_node
;
2586 struct lttng_enabler
*enabler
=
2587 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2588 uint32_t bytecode_len
;
2591 ret
= get_user(bytecode_len
, &bytecode
->len
);
2595 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2600 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2601 sizeof(*bytecode
) + bytecode_len
);
2605 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2606 bytecode_node
->enabler
= enabler
;
2608 /* Enforce length based on allocated size */
2609 bytecode_node
->bc
.len
= bytecode_len
;
2610 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2612 event_notifier_enabler
->num_captures
++;
2614 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2618 lttng_kvfree(bytecode_node
);
2623 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2624 struct lttng_kernel_abi_event_callsite __user
*callsite
)
2627 switch (event_notifier
->instrumentation
) {
2628 case LTTNG_KERNEL_ABI_UPROBE
:
2629 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2637 void lttng_event_notifier_enabler_destroy(
2638 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2640 if (!event_notifier_enabler
) {
2644 list_del(&event_notifier_enabler
->node
);
2646 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2647 kfree(event_notifier_enabler
);
2651 * lttng_session_sync_event_enablers should be called just before starting a
2653 * Should be called with sessions mutex held.
2656 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2658 struct lttng_event_enabler
*event_enabler
;
2659 struct lttng_event
*event
;
2661 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2662 lttng_event_enabler_ref_events(event_enabler
);
2664 * For each event, if at least one of its enablers is enabled,
2665 * and its channel and session transient states are enabled, we
2666 * enable the event, else we disable it.
2668 list_for_each_entry(event
, &session
->events
, list
) {
2669 struct lttng_enabler_ref
*enabler_ref
;
2670 struct lttng_bytecode_runtime
*runtime
;
2671 int enabled
= 0, has_enablers_without_bytecode
= 0;
2673 switch (event
->instrumentation
) {
2674 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2675 case LTTNG_KERNEL_ABI_SYSCALL
:
2677 list_for_each_entry(enabler_ref
,
2678 &event
->enablers_ref_head
, node
) {
2679 if (enabler_ref
->ref
->enabled
) {
2687 /* Not handled with lazy sync. */
2691 * Enabled state is based on union of enablers, with
2692 * intesection of session and channel transient enable
2695 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2697 WRITE_ONCE(event
->enabled
, enabled
);
2699 * Sync tracepoint registration with event enabled
2703 register_event(event
);
2705 _lttng_event_unregister(event
);
2708 /* Check if has enablers without bytecode enabled */
2709 list_for_each_entry(enabler_ref
,
2710 &event
->enablers_ref_head
, node
) {
2711 if (enabler_ref
->ref
->enabled
2712 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2713 has_enablers_without_bytecode
= 1;
2717 event
->has_enablers_without_bytecode
=
2718 has_enablers_without_bytecode
;
2720 /* Enable filters */
2721 list_for_each_entry(runtime
,
2722 &event
->filter_bytecode_runtime_head
, node
)
2723 lttng_bytecode_filter_sync_state(runtime
);
2728 * Apply enablers to session events, adding events to session if need
2729 * be. It is required after each modification applied to an active
2730 * session, and right before session "start".
2731 * "lazy" sync means we only sync if required.
2732 * Should be called with sessions mutex held.
2735 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2737 /* We can skip if session is not active */
2738 if (!session
->active
)
2740 lttng_session_sync_event_enablers(session
);
2744 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2746 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2747 struct lttng_event_notifier
*event_notifier
;
2749 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2750 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2753 * For each event_notifier, if at least one of its enablers is enabled,
2754 * we enable the event_notifier, else we disable it.
2756 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2757 struct lttng_enabler_ref
*enabler_ref
;
2758 struct lttng_bytecode_runtime
*runtime
;
2759 int enabled
= 0, has_enablers_without_bytecode
= 0;
2761 switch (event_notifier
->instrumentation
) {
2762 case LTTNG_KERNEL_ABI_TRACEPOINT
: /* Fall-through */
2763 case LTTNG_KERNEL_ABI_SYSCALL
:
2764 /* Enable event_notifiers */
2765 list_for_each_entry(enabler_ref
,
2766 &event_notifier
->enablers_ref_head
, node
) {
2767 if (enabler_ref
->ref
->enabled
) {
2775 /* Not handled with sync. */
2779 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2781 * Sync tracepoint registration with event_notifier enabled
2785 if (!event_notifier
->registered
)
2786 register_event_notifier(event_notifier
);
2788 if (event_notifier
->registered
)
2789 _lttng_event_notifier_unregister(event_notifier
);
2792 /* Check if has enablers without bytecode enabled */
2793 list_for_each_entry(enabler_ref
,
2794 &event_notifier
->enablers_ref_head
, node
) {
2795 if (enabler_ref
->ref
->enabled
2796 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2797 has_enablers_without_bytecode
= 1;
2801 event_notifier
->has_enablers_without_bytecode
=
2802 has_enablers_without_bytecode
;
2804 /* Enable filters */
2805 list_for_each_entry(runtime
,
2806 &event_notifier
->filter_bytecode_runtime_head
, node
)
2807 lttng_bytecode_filter_sync_state(runtime
);
2809 /* Enable captures */
2810 list_for_each_entry(runtime
,
2811 &event_notifier
->capture_bytecode_runtime_head
, node
)
2812 lttng_bytecode_capture_sync_state(runtime
);
2814 WRITE_ONCE(event_notifier
->eval_capture
, !!event_notifier
->num_captures
);
2819 * Serialize at most one packet worth of metadata into a metadata
2821 * We grab the metadata cache mutex to get exclusive access to our metadata
2822 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2823 * allows us to do racy operations such as looking for remaining space left in
2824 * packet and write, since mutual exclusion protects us from concurrent writes.
2825 * Mutual exclusion on the metadata cache allow us to read the cache content
2826 * without racing against reallocation of the cache by updates.
2827 * Returns the number of bytes written in the channel, 0 if no data
2828 * was written and a negative value on error.
2830 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2831 struct channel
*chan
, bool *coherent
)
2833 struct lib_ring_buffer_ctx ctx
;
2835 size_t len
, reserve_len
;
2838 * Ensure we support mutiple get_next / put sequences followed by
2839 * put_next. The metadata cache lock protects reading the metadata
2840 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2841 * "flush" operations on the buffer invoked by different processes.
2842 * Moreover, since the metadata cache memory can be reallocated, we
2843 * need to have exclusive access against updates even though we only
2846 mutex_lock(&stream
->metadata_cache
->lock
);
2847 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2848 if (stream
->metadata_in
!= stream
->metadata_out
)
2851 /* Metadata regenerated, change the version. */
2852 if (stream
->metadata_cache
->version
!= stream
->version
)
2853 stream
->version
= stream
->metadata_cache
->version
;
2855 len
= stream
->metadata_cache
->metadata_written
-
2856 stream
->metadata_in
;
2859 reserve_len
= min_t(size_t,
2860 stream
->transport
->ops
.packet_avail_size(chan
),
2862 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2865 * If reservation failed, return an error to the caller.
2867 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2869 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2870 stream
->coherent
= false;
2873 stream
->transport
->ops
.event_write(&ctx
,
2874 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2876 stream
->transport
->ops
.event_commit(&ctx
);
2877 stream
->metadata_in
+= reserve_len
;
2878 if (reserve_len
< len
)
2879 stream
->coherent
= false;
2881 stream
->coherent
= true;
2886 *coherent
= stream
->coherent
;
2887 mutex_unlock(&stream
->metadata_cache
->lock
);
2892 void lttng_metadata_begin(struct lttng_session
*session
)
2894 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2895 mutex_lock(&session
->metadata_cache
->lock
);
2899 void lttng_metadata_end(struct lttng_session
*session
)
2901 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2902 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2903 struct lttng_metadata_stream
*stream
;
2905 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2906 wake_up_interruptible(&stream
->read_wait
);
2907 mutex_unlock(&session
->metadata_cache
->lock
);
2912 * Write the metadata to the metadata cache.
2913 * Must be called with sessions_mutex held.
2914 * The metadata cache lock protects us from concurrent read access from
2915 * thread outputting metadata content to ring buffer.
2916 * The content of the printf is printed as a single atomic metadata
2919 int lttng_metadata_printf(struct lttng_session
*session
,
2920 const char *fmt
, ...)
2926 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2929 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2935 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2936 if (session
->metadata_cache
->metadata_written
+ len
>
2937 session
->metadata_cache
->cache_alloc
) {
2938 char *tmp_cache_realloc
;
2939 unsigned int tmp_cache_alloc_size
;
2941 tmp_cache_alloc_size
= max_t(unsigned int,
2942 session
->metadata_cache
->cache_alloc
+ len
,
2943 session
->metadata_cache
->cache_alloc
<< 1);
2944 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2945 if (!tmp_cache_realloc
)
2947 if (session
->metadata_cache
->data
) {
2948 memcpy(tmp_cache_realloc
,
2949 session
->metadata_cache
->data
,
2950 session
->metadata_cache
->cache_alloc
);
2951 vfree(session
->metadata_cache
->data
);
2954 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2955 session
->metadata_cache
->data
= tmp_cache_realloc
;
2957 memcpy(session
->metadata_cache
->data
+
2958 session
->metadata_cache
->metadata_written
,
2960 session
->metadata_cache
->metadata_written
+= len
;
2971 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2975 for (i
= 0; i
< nesting
; i
++) {
2978 ret
= lttng_metadata_printf(session
, " ");
2987 int lttng_field_name_statedump(struct lttng_session
*session
,
2988 const struct lttng_kernel_event_field
*field
,
2991 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
2995 int _lttng_integer_type_statedump(struct lttng_session
*session
,
2996 const struct lttng_kernel_type_integer
*type
,
2997 enum lttng_kernel_string_encoding parent_encoding
,
3002 ret
= print_tabs(session
, nesting
);
3005 ret
= lttng_metadata_printf(session
,
3006 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3010 (parent_encoding
== lttng_kernel_string_encoding_none
)
3012 : (parent_encoding
== lttng_kernel_string_encoding_UTF8
)
3016 #if __BYTE_ORDER == __BIG_ENDIAN
3017 type
->reverse_byte_order
? " byte_order = le;" : ""
3019 type
->reverse_byte_order
? " byte_order = be;" : ""
3026 * Must be called with sessions_mutex held.
3029 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3030 const struct lttng_kernel_type_struct
*type
,
3034 uint32_t i
, nr_fields
;
3035 unsigned int alignment
;
3037 ret
= print_tabs(session
, nesting
);
3040 ret
= lttng_metadata_printf(session
,
3044 nr_fields
= type
->nr_fields
;
3045 for (i
= 0; i
< nr_fields
; i
++) {
3046 const struct lttng_kernel_event_field
*iter_field
;
3048 iter_field
= type
->fields
[i
];
3049 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3053 ret
= print_tabs(session
, nesting
);
3056 alignment
= type
->alignment
;
3058 ret
= lttng_metadata_printf(session
,
3062 ret
= lttng_metadata_printf(session
,
3069 * Must be called with sessions_mutex held.
3072 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3073 const struct lttng_kernel_event_field
*field
,
3078 ret
= _lttng_struct_type_statedump(session
,
3079 lttng_kernel_get_type_struct(field
->type
), nesting
);
3082 return lttng_field_name_statedump(session
, field
, nesting
);
3086 * Must be called with sessions_mutex held.
3089 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3090 const struct lttng_kernel_type_variant
*type
,
3094 uint32_t i
, nr_choices
;
3097 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3099 if (type
->alignment
!= 0)
3101 ret
= print_tabs(session
, nesting
);
3104 ret
= lttng_metadata_printf(session
,
3105 "variant <_%s> {\n",
3109 nr_choices
= type
->nr_choices
;
3110 for (i
= 0; i
< nr_choices
; i
++) {
3111 const struct lttng_kernel_event_field
*iter_field
;
3113 iter_field
= type
->choices
[i
];
3114 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3118 ret
= print_tabs(session
, nesting
);
3121 ret
= lttng_metadata_printf(session
,
3127 * Must be called with sessions_mutex held.
3130 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3131 const struct lttng_kernel_event_field
*field
,
3136 ret
= _lttng_variant_type_statedump(session
,
3137 lttng_kernel_get_type_variant(field
->type
), nesting
);
3140 return lttng_field_name_statedump(session
, field
, nesting
);
3144 * Must be called with sessions_mutex held.
3147 int _lttng_array_field_statedump(struct lttng_session
*session
,
3148 const struct lttng_kernel_event_field
*field
,
3152 const struct lttng_kernel_type_array
*array_type
;
3153 const struct lttng_kernel_type_common
*elem_type
;
3155 array_type
= lttng_kernel_get_type_array(field
->type
);
3156 WARN_ON_ONCE(!array_type
);
3158 if (array_type
->alignment
) {
3159 ret
= print_tabs(session
, nesting
);
3162 ret
= lttng_metadata_printf(session
,
3163 "struct { } align(%u) _%s_padding;\n",
3164 array_type
->alignment
* CHAR_BIT
,
3170 * Nested compound types: Only array of structures and variants are
3171 * currently supported.
3173 elem_type
= array_type
->elem_type
;
3174 switch (elem_type
->type
) {
3175 case lttng_kernel_type_integer
:
3176 case lttng_kernel_type_struct
:
3177 case lttng_kernel_type_variant
:
3178 ret
= _lttng_type_statedump(session
, elem_type
,
3179 array_type
->encoding
, nesting
);
3187 ret
= lttng_metadata_printf(session
,
3190 array_type
->length
);
3195 * Must be called with sessions_mutex held.
3198 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3199 const struct lttng_kernel_event_field
*field
,
3203 const char *length_name
;
3204 const struct lttng_kernel_type_sequence
*sequence_type
;
3205 const struct lttng_kernel_type_common
*elem_type
;
3207 sequence_type
= lttng_kernel_get_type_sequence(field
->type
);
3208 WARN_ON_ONCE(!sequence_type
);
3210 length_name
= sequence_type
->length_name
;
3212 if (sequence_type
->alignment
) {
3213 ret
= print_tabs(session
, nesting
);
3216 ret
= lttng_metadata_printf(session
,
3217 "struct { } align(%u) _%s_padding;\n",
3218 sequence_type
->alignment
* CHAR_BIT
,
3225 * Nested compound types: Only array of structures and variants are
3226 * currently supported.
3228 elem_type
= sequence_type
->elem_type
;
3229 switch (elem_type
->type
) {
3230 case lttng_kernel_type_integer
:
3231 case lttng_kernel_type_struct
:
3232 case lttng_kernel_type_variant
:
3233 ret
= _lttng_type_statedump(session
, elem_type
,
3234 sequence_type
->encoding
, nesting
);
3242 ret
= lttng_metadata_printf(session
,
3245 sequence_type
->length_name
);
3250 * Must be called with sessions_mutex held.
3253 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3254 const struct lttng_kernel_type_enum
*type
,
3257 const struct lttng_kernel_enum_desc
*enum_desc
;
3258 const struct lttng_kernel_type_common
*container_type
;
3260 unsigned int i
, nr_entries
;
3262 container_type
= type
->container_type
;
3263 if (container_type
->type
!= lttng_kernel_type_integer
) {
3267 enum_desc
= type
->desc
;
3268 nr_entries
= enum_desc
->nr_entries
;
3270 ret
= print_tabs(session
, nesting
);
3273 ret
= lttng_metadata_printf(session
, "enum : ");
3276 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(container_type
),
3277 lttng_kernel_string_encoding_none
, 0);
3280 ret
= lttng_metadata_printf(session
, " {\n");
3283 /* Dump all entries */
3284 for (i
= 0; i
< nr_entries
; i
++) {
3285 const struct lttng_kernel_enum_entry
*entry
= enum_desc
->entries
[i
];
3288 ret
= print_tabs(session
, nesting
+ 1);
3291 ret
= lttng_metadata_printf(session
,
3295 len
= strlen(entry
->string
);
3296 /* Escape the character '"' */
3297 for (j
= 0; j
< len
; j
++) {
3298 char c
= entry
->string
[j
];
3302 ret
= lttng_metadata_printf(session
,
3306 ret
= lttng_metadata_printf(session
,
3310 ret
= lttng_metadata_printf(session
,
3317 ret
= lttng_metadata_printf(session
, "\"");
3321 if (entry
->options
.is_auto
) {
3322 ret
= lttng_metadata_printf(session
, ",\n");
3326 ret
= lttng_metadata_printf(session
,
3330 if (entry
->start
.signedness
)
3331 ret
= lttng_metadata_printf(session
,
3332 "%lld", (long long) entry
->start
.value
);
3334 ret
= lttng_metadata_printf(session
,
3335 "%llu", entry
->start
.value
);
3338 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3340 == entry
->end
.value
) {
3341 ret
= lttng_metadata_printf(session
,
3344 if (entry
->end
.signedness
) {
3345 ret
= lttng_metadata_printf(session
,
3347 (long long) entry
->end
.value
);
3349 ret
= lttng_metadata_printf(session
,
3358 ret
= print_tabs(session
, nesting
);
3361 ret
= lttng_metadata_printf(session
, "}");
3367 * Must be called with sessions_mutex held.
3370 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3371 const struct lttng_kernel_event_field
*field
,
3375 const struct lttng_kernel_type_enum
*enum_type
;
3377 enum_type
= lttng_kernel_get_type_enum(field
->type
);
3378 WARN_ON_ONCE(!enum_type
);
3379 ret
= _lttng_enum_type_statedump(session
, enum_type
, nesting
);
3382 return lttng_field_name_statedump(session
, field
, nesting
);
3386 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3387 const struct lttng_kernel_event_field
*field
,
3392 ret
= _lttng_integer_type_statedump(session
, lttng_kernel_get_type_integer(field
->type
),
3393 lttng_kernel_string_encoding_none
, nesting
);
3396 return lttng_field_name_statedump(session
, field
, nesting
);
3400 int _lttng_string_type_statedump(struct lttng_session
*session
,
3401 const struct lttng_kernel_type_string
*type
,
3406 /* Default encoding is UTF8 */
3407 ret
= print_tabs(session
, nesting
);
3410 ret
= lttng_metadata_printf(session
,
3412 type
->encoding
== lttng_kernel_string_encoding_ASCII
?
3413 " { encoding = ASCII; }" : "");
3418 int _lttng_string_field_statedump(struct lttng_session
*session
,
3419 const struct lttng_kernel_event_field
*field
,
3422 const struct lttng_kernel_type_string
*string_type
;
3425 string_type
= lttng_kernel_get_type_string(field
->type
);
3426 WARN_ON_ONCE(!string_type
);
3427 ret
= _lttng_string_type_statedump(session
, string_type
, nesting
);
3430 return lttng_field_name_statedump(session
, field
, nesting
);
3434 * Must be called with sessions_mutex held.
3437 int _lttng_type_statedump(struct lttng_session
*session
,
3438 const struct lttng_kernel_type_common
*type
,
3439 enum lttng_kernel_string_encoding parent_encoding
,
3444 switch (type
->type
) {
3445 case lttng_kernel_type_integer
:
3446 ret
= _lttng_integer_type_statedump(session
,
3447 lttng_kernel_get_type_integer(type
),
3448 parent_encoding
, nesting
);
3450 case lttng_kernel_type_enum
:
3451 ret
= _lttng_enum_type_statedump(session
,
3452 lttng_kernel_get_type_enum(type
),
3455 case lttng_kernel_type_string
:
3456 ret
= _lttng_string_type_statedump(session
,
3457 lttng_kernel_get_type_string(type
),
3460 case lttng_kernel_type_struct
:
3461 ret
= _lttng_struct_type_statedump(session
,
3462 lttng_kernel_get_type_struct(type
),
3465 case lttng_kernel_type_variant
:
3466 ret
= _lttng_variant_type_statedump(session
,
3467 lttng_kernel_get_type_variant(type
),
3471 /* Nested arrays and sequences are not supported yet. */
3472 case lttng_kernel_type_array
:
3473 case lttng_kernel_type_sequence
:
3482 * Must be called with sessions_mutex held.
3485 int _lttng_field_statedump(struct lttng_session
*session
,
3486 const struct lttng_kernel_event_field
*field
,
3491 switch (field
->type
->type
) {
3492 case lttng_kernel_type_integer
:
3493 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3495 case lttng_kernel_type_enum
:
3496 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3498 case lttng_kernel_type_string
:
3499 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3501 case lttng_kernel_type_struct
:
3502 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3504 case lttng_kernel_type_array
:
3505 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3507 case lttng_kernel_type_sequence
:
3508 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3510 case lttng_kernel_type_variant
:
3511 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3522 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3523 struct lttng_kernel_ctx
*ctx
)
3530 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3531 const struct lttng_kernel_ctx_field
*field
= &ctx
->fields
[i
];
3533 ret
= _lttng_field_statedump(session
, field
->event_field
, 2);
3541 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3542 struct lttng_event
*event
)
3544 const struct lttng_kernel_event_desc
*desc
= event
->desc
;
3548 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3549 const struct lttng_kernel_event_field
*field
= desc
->fields
[i
];
3551 ret
= _lttng_field_statedump(session
, field
, 2);
3559 * Must be called with sessions_mutex held.
3560 * The entire event metadata is printed as a single atomic metadata
3564 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3565 struct lttng_channel
*chan
,
3566 struct lttng_event
*event
)
3570 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3572 if (chan
->channel_type
== METADATA_CHANNEL
)
3575 lttng_metadata_begin(session
);
3577 ret
= lttng_metadata_printf(session
,
3581 " stream_id = %u;\n",
3582 event
->desc
->event_name
,
3589 ret
= lttng_metadata_printf(session
,
3590 " context := struct {\n");
3594 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3598 ret
= lttng_metadata_printf(session
,
3604 ret
= lttng_metadata_printf(session
,
3605 " fields := struct {\n"
3610 ret
= _lttng_fields_metadata_statedump(session
, event
);
3615 * LTTng space reservation can only reserve multiples of the
3618 ret
= lttng_metadata_printf(session
,
3624 event
->metadata_dumped
= 1;
3626 lttng_metadata_end(session
);
3632 * Must be called with sessions_mutex held.
3633 * The entire channel metadata is printed as a single atomic metadata
3637 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3638 struct lttng_channel
*chan
)
3642 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3645 if (chan
->channel_type
== METADATA_CHANNEL
)
3648 lttng_metadata_begin(session
);
3650 WARN_ON_ONCE(!chan
->header_type
);
3651 ret
= lttng_metadata_printf(session
,
3654 " event.header := %s;\n"
3655 " packet.context := struct packet_context;\n",
3657 chan
->header_type
== 1 ? "struct event_header_compact" :
3658 "struct event_header_large");
3663 ret
= lttng_metadata_printf(session
,
3664 " event.context := struct {\n");
3668 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3672 ret
= lttng_metadata_printf(session
,
3678 ret
= lttng_metadata_printf(session
,
3681 chan
->metadata_dumped
= 1;
3683 lttng_metadata_end(session
);
3688 * Must be called with sessions_mutex held.
3691 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3693 return lttng_metadata_printf(session
,
3694 "struct packet_context {\n"
3695 " uint64_clock_monotonic_t timestamp_begin;\n"
3696 " uint64_clock_monotonic_t timestamp_end;\n"
3697 " uint64_t content_size;\n"
3698 " uint64_t packet_size;\n"
3699 " uint64_t packet_seq_num;\n"
3700 " unsigned long events_discarded;\n"
3701 " uint32_t cpu_id;\n"
3708 * id: range: 0 - 30.
3709 * id 31 is reserved to indicate an extended header.
3712 * id: range: 0 - 65534.
3713 * id 65535 is reserved to indicate an extended header.
3715 * Must be called with sessions_mutex held.
3718 int _lttng_event_header_declare(struct lttng_session
*session
)
3720 return lttng_metadata_printf(session
,
3721 "struct event_header_compact {\n"
3722 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3725 " uint27_clock_monotonic_t timestamp;\n"
3729 " uint64_clock_monotonic_t timestamp;\n"
3734 "struct event_header_large {\n"
3735 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3738 " uint32_clock_monotonic_t timestamp;\n"
3742 " uint64_clock_monotonic_t timestamp;\n"
3746 lttng_alignof(uint32_t) * CHAR_BIT
,
3747 lttng_alignof(uint16_t) * CHAR_BIT
3752 * Approximation of NTP time of day to clock monotonic correlation,
3753 * taken at start of trace.
3754 * Yes, this is only an approximation. Yes, we can (and will) do better
3755 * in future versions.
3756 * This function may return a negative offset. It may happen if the
3757 * system sets the REALTIME clock to 0 after boot.
3759 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3763 int64_t measure_clock_offset(void)
3765 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3766 uint64_t tcf
= trace_clock_freq();
3768 unsigned long flags
;
3769 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3770 struct timespec64 rts
= { 0, 0 };
3772 struct timespec rts
= { 0, 0 };
3775 /* Disable interrupts to increase correlation precision. */
3776 local_irq_save(flags
);
3777 monotonic
[0] = trace_clock_read64();
3778 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3779 ktime_get_real_ts64(&rts
);
3781 getnstimeofday(&rts
);
3783 monotonic
[1] = trace_clock_read64();
3784 local_irq_restore(flags
);
3786 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3787 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3788 if (tcf
== NSEC_PER_SEC
) {
3789 realtime
+= rts
.tv_nsec
;
3791 uint64_t n
= rts
.tv_nsec
* tcf
;
3793 do_div(n
, NSEC_PER_SEC
);
3796 offset
= (int64_t) realtime
- monotonic_avg
;
3801 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3809 while (cur
!= '\0') {
3812 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3816 ret
= lttng_metadata_printf(session
, "%c", '\\');
3819 /* We still print the current char */
3822 ret
= lttng_metadata_printf(session
, "%c", cur
);
3836 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3837 const char *field_value
)
3841 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3845 ret
= print_escaped_ctf_string(session
, field_value
);
3849 ret
= lttng_metadata_printf(session
, "\";\n");
3856 * Output metadata into this session's metadata buffers.
3857 * Must be called with sessions_mutex held.
3860 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3862 unsigned char *uuid_c
= session
->uuid
.b
;
3863 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3864 const char *product_uuid
;
3865 struct lttng_channel
*chan
;
3866 struct lttng_event
*event
;
3869 if (!LTTNG_READ_ONCE(session
->active
))
3872 lttng_metadata_begin(session
);
3874 if (session
->metadata_dumped
)
3877 snprintf(uuid_s
, sizeof(uuid_s
),
3878 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3879 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3880 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3881 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3882 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3884 ret
= lttng_metadata_printf(session
,
3885 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3886 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3887 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3888 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3889 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3890 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3891 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3897 " byte_order = %s;\n"
3898 " packet.header := struct {\n"
3899 " uint32_t magic;\n"
3900 " uint8_t uuid[16];\n"
3901 " uint32_t stream_id;\n"
3902 " uint64_t stream_instance_id;\n"
3905 lttng_alignof(uint8_t) * CHAR_BIT
,
3906 lttng_alignof(uint16_t) * CHAR_BIT
,
3907 lttng_alignof(uint32_t) * CHAR_BIT
,
3908 lttng_alignof(uint64_t) * CHAR_BIT
,
3909 sizeof(unsigned long) * CHAR_BIT
,
3910 lttng_alignof(unsigned long) * CHAR_BIT
,
3914 #if __BYTE_ORDER == __BIG_ENDIAN
3923 ret
= lttng_metadata_printf(session
,
3925 " hostname = \"%s\";\n"
3926 " domain = \"kernel\";\n"
3927 " sysname = \"%s\";\n"
3928 " kernel_release = \"%s\";\n"
3929 " kernel_version = \"%s\";\n"
3930 " tracer_name = \"lttng-modules\";\n"
3931 " tracer_major = %d;\n"
3932 " tracer_minor = %d;\n"
3933 " tracer_patchlevel = %d;\n"
3934 " trace_buffering_scheme = \"global\";\n",
3935 current
->nsproxy
->uts_ns
->name
.nodename
,
3939 LTTNG_MODULES_MAJOR_VERSION
,
3940 LTTNG_MODULES_MINOR_VERSION
,
3941 LTTNG_MODULES_PATCHLEVEL_VERSION
3946 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3949 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3950 session
->creation_time
);
3954 /* Add the product UUID to the 'env' section */
3955 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3957 ret
= lttng_metadata_printf(session
,
3958 " product_uuid = \"%s\";\n",
3965 /* Close the 'env' section */
3966 ret
= lttng_metadata_printf(session
, "};\n\n");
3970 ret
= lttng_metadata_printf(session
,
3972 " name = \"%s\";\n",
3978 if (!trace_clock_uuid(clock_uuid_s
)) {
3979 ret
= lttng_metadata_printf(session
,
3980 " uuid = \"%s\";\n",
3987 ret
= lttng_metadata_printf(session
,
3988 " description = \"%s\";\n"
3989 " freq = %llu; /* Frequency, in Hz */\n"
3990 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3993 trace_clock_description(),
3994 (unsigned long long) trace_clock_freq(),
3995 (long long) measure_clock_offset()
4000 ret
= lttng_metadata_printf(session
,
4001 "typealias integer {\n"
4002 " size = 27; align = 1; signed = false;\n"
4003 " map = clock.%s.value;\n"
4004 "} := uint27_clock_monotonic_t;\n"
4006 "typealias integer {\n"
4007 " size = 32; align = %u; signed = false;\n"
4008 " map = clock.%s.value;\n"
4009 "} := uint32_clock_monotonic_t;\n"
4011 "typealias integer {\n"
4012 " size = 64; align = %u; signed = false;\n"
4013 " map = clock.%s.value;\n"
4014 "} := uint64_clock_monotonic_t;\n\n",
4016 lttng_alignof(uint32_t) * CHAR_BIT
,
4018 lttng_alignof(uint64_t) * CHAR_BIT
,
4024 ret
= _lttng_stream_packet_context_declare(session
);
4028 ret
= _lttng_event_header_declare(session
);
4033 list_for_each_entry(chan
, &session
->chan
, list
) {
4034 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4039 list_for_each_entry(event
, &session
->events
, list
) {
4040 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
4044 session
->metadata_dumped
= 1;
4046 lttng_metadata_end(session
);
4051 * lttng_transport_register - LTT transport registration
4052 * @transport: transport structure
4054 * Registers a transport which can be used as output to extract the data out of
4055 * LTTng. The module calling this registration function must ensure that no
4056 * trap-inducing code will be executed by the transport functions. E.g.
4057 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4058 * is made visible to the transport function. This registration acts as a
4059 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4060 * after its registration must it synchronize the TLBs.
4062 void lttng_transport_register(struct lttng_transport
*transport
)
4065 * Make sure no page fault can be triggered by the module about to be
4066 * registered. We deal with this here so we don't have to call
4067 * vmalloc_sync_mappings() in each module's init.
4069 wrapper_vmalloc_sync_mappings();
4071 mutex_lock(&sessions_mutex
);
4072 list_add_tail(&transport
->node
, <tng_transport_list
);
4073 mutex_unlock(&sessions_mutex
);
4075 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4078 * lttng_transport_unregister - LTT transport unregistration
4079 * @transport: transport structure
4081 void lttng_transport_unregister(struct lttng_transport
*transport
)
4083 mutex_lock(&sessions_mutex
);
4084 list_del(&transport
->node
);
4085 mutex_unlock(&sessions_mutex
);
4087 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4089 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4092 * Make sure no page fault can be triggered by the module about to be
4093 * registered. We deal with this here so we don't have to call
4094 * vmalloc_sync_mappings() in each module's init.
4096 wrapper_vmalloc_sync_mappings();
4098 mutex_lock(&sessions_mutex
);
4099 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4100 mutex_unlock(&sessions_mutex
);
4102 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4104 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4106 mutex_lock(&sessions_mutex
);
4107 list_del(&transport
->node
);
4108 mutex_unlock(&sessions_mutex
);
4110 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4112 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4114 enum cpuhp_state lttng_hp_prepare
;
4115 enum cpuhp_state lttng_hp_online
;
4117 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4119 struct lttng_cpuhp_node
*lttng_node
;
4121 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4122 switch (lttng_node
->component
) {
4123 case LTTNG_RING_BUFFER_FRONTEND
:
4125 case LTTNG_RING_BUFFER_BACKEND
:
4126 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4127 case LTTNG_RING_BUFFER_ITER
:
4129 case LTTNG_CONTEXT_PERF_COUNTERS
:
4136 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4138 struct lttng_cpuhp_node
*lttng_node
;
4140 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4141 switch (lttng_node
->component
) {
4142 case LTTNG_RING_BUFFER_FRONTEND
:
4143 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4144 case LTTNG_RING_BUFFER_BACKEND
:
4146 case LTTNG_RING_BUFFER_ITER
:
4148 case LTTNG_CONTEXT_PERF_COUNTERS
:
4149 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4155 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4157 struct lttng_cpuhp_node
*lttng_node
;
4159 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4160 switch (lttng_node
->component
) {
4161 case LTTNG_RING_BUFFER_FRONTEND
:
4162 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4163 case LTTNG_RING_BUFFER_BACKEND
:
4165 case LTTNG_RING_BUFFER_ITER
:
4166 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4167 case LTTNG_CONTEXT_PERF_COUNTERS
:
4168 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4174 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4176 struct lttng_cpuhp_node
*lttng_node
;
4178 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4179 switch (lttng_node
->component
) {
4180 case LTTNG_RING_BUFFER_FRONTEND
:
4181 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4182 case LTTNG_RING_BUFFER_BACKEND
:
4184 case LTTNG_RING_BUFFER_ITER
:
4186 case LTTNG_CONTEXT_PERF_COUNTERS
:
4193 static int __init
lttng_init_cpu_hotplug(void)
4197 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4198 lttng_hotplug_prepare
,
4199 lttng_hotplug_dead
);
4203 lttng_hp_prepare
= ret
;
4204 lttng_rb_set_hp_prepare(ret
);
4206 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4207 lttng_hotplug_online
,
4208 lttng_hotplug_offline
);
4210 cpuhp_remove_multi_state(lttng_hp_prepare
);
4211 lttng_hp_prepare
= 0;
4214 lttng_hp_online
= ret
;
4215 lttng_rb_set_hp_online(ret
);
4220 static void __exit
lttng_exit_cpu_hotplug(void)
4222 lttng_rb_set_hp_online(0);
4223 cpuhp_remove_multi_state(lttng_hp_online
);
4224 lttng_rb_set_hp_prepare(0);
4225 cpuhp_remove_multi_state(lttng_hp_prepare
);
4228 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4229 static int lttng_init_cpu_hotplug(void)
4233 static void lttng_exit_cpu_hotplug(void)
4236 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4239 static int __init
lttng_events_init(void)
4243 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4246 ret
= wrapper_get_pfnblock_flags_mask_init();
4249 ret
= wrapper_get_pageblock_flags_mask_init();
4252 ret
= lttng_probes_init();
4255 ret
= lttng_context_init();
4258 ret
= lttng_tracepoint_init();
4261 event_cache
= KMEM_CACHE(lttng_event
, 0);
4264 goto error_kmem_event
;
4266 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4267 if (!event_notifier_cache
) {
4269 goto error_kmem_event_notifier
;
4271 ret
= lttng_abi_init();
4274 ret
= lttng_logger_init();
4277 ret
= lttng_init_cpu_hotplug();
4280 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4281 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4282 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4283 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4284 LTTNG_MODULES_EXTRAVERSION
,
4286 #ifdef LTTNG_EXTRA_VERSION_GIT
4287 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4291 #ifdef LTTNG_EXTRA_VERSION_NAME
4292 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4299 lttng_logger_exit();
4303 kmem_cache_destroy(event_notifier_cache
);
4304 error_kmem_event_notifier
:
4305 kmem_cache_destroy(event_cache
);
4307 lttng_tracepoint_exit();
4309 lttng_context_exit();
4310 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4311 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4312 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4313 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4314 LTTNG_MODULES_EXTRAVERSION
,
4316 #ifdef LTTNG_EXTRA_VERSION_GIT
4317 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4321 #ifdef LTTNG_EXTRA_VERSION_NAME
4322 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4329 module_init(lttng_events_init
);
4331 static void __exit
lttng_events_exit(void)
4333 struct lttng_session
*session
, *tmpsession
;
4335 lttng_exit_cpu_hotplug();
4336 lttng_logger_exit();
4338 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4339 lttng_session_destroy(session
);
4340 kmem_cache_destroy(event_cache
);
4341 kmem_cache_destroy(event_notifier_cache
);
4342 lttng_tracepoint_exit();
4343 lttng_context_exit();
4344 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4345 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4346 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4347 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4348 LTTNG_MODULES_EXTRAVERSION
,
4350 #ifdef LTTNG_EXTRA_VERSION_GIT
4351 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4355 #ifdef LTTNG_EXTRA_VERSION_NAME
4356 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4362 module_exit(lttng_events_exit
);
4364 #include <generated/patches.h>
4365 #ifdef LTTNG_EXTRA_VERSION_GIT
4366 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4368 #ifdef LTTNG_EXTRA_VERSION_NAME
4369 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4371 MODULE_LICENSE("GPL and additional rights");
4372 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4373 MODULE_DESCRIPTION("LTTng tracer");
4374 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4375 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4376 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4377 LTTNG_MODULES_EXTRAVERSION
);