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_type
*type
,
88 int _lttng_field_statedump(struct lttng_session
*session
,
89 const struct lttng_event_field
*field
,
92 void synchronize_trace(void)
94 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0))
100 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0))
101 #ifdef CONFIG_PREEMPT_RT_FULL
104 #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
105 #ifdef CONFIG_PREEMPT_RT
108 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */
111 void lttng_lock_sessions(void)
113 mutex_lock(&sessions_mutex
);
116 void lttng_unlock_sessions(void)
118 mutex_unlock(&sessions_mutex
);
121 static struct lttng_transport
*lttng_transport_find(const char *name
)
123 struct lttng_transport
*transport
;
125 list_for_each_entry(transport
, <tng_transport_list
, node
) {
126 if (!strcmp(transport
->name
, name
))
133 * Called with sessions lock held.
135 int lttng_session_active(void)
137 struct lttng_session
*iter
;
139 list_for_each_entry(iter
, &sessions
, list
) {
146 struct lttng_session
*lttng_session_create(void)
148 struct lttng_session
*session
;
149 struct lttng_metadata_cache
*metadata_cache
;
152 mutex_lock(&sessions_mutex
);
153 session
= lttng_kvzalloc(sizeof(struct lttng_session
), GFP_KERNEL
);
156 INIT_LIST_HEAD(&session
->chan
);
157 INIT_LIST_HEAD(&session
->events
);
158 lttng_guid_gen(&session
->uuid
);
160 metadata_cache
= kzalloc(sizeof(struct lttng_metadata_cache
),
163 goto err_free_session
;
164 metadata_cache
->data
= vzalloc(METADATA_CACHE_DEFAULT_SIZE
);
165 if (!metadata_cache
->data
)
167 metadata_cache
->cache_alloc
= METADATA_CACHE_DEFAULT_SIZE
;
168 kref_init(&metadata_cache
->refcount
);
169 mutex_init(&metadata_cache
->lock
);
170 session
->metadata_cache
= metadata_cache
;
171 INIT_LIST_HEAD(&metadata_cache
->metadata_stream
);
172 memcpy(&metadata_cache
->uuid
, &session
->uuid
,
173 sizeof(metadata_cache
->uuid
));
174 INIT_LIST_HEAD(&session
->enablers_head
);
175 for (i
= 0; i
< LTTNG_EVENT_HT_SIZE
; i
++)
176 INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
177 list_add(&session
->list
, &sessions
);
178 session
->pid_tracker
.session
= session
;
179 session
->pid_tracker
.tracker_type
= TRACKER_PID
;
180 session
->vpid_tracker
.session
= session
;
181 session
->vpid_tracker
.tracker_type
= TRACKER_VPID
;
182 session
->uid_tracker
.session
= session
;
183 session
->uid_tracker
.tracker_type
= TRACKER_UID
;
184 session
->vuid_tracker
.session
= session
;
185 session
->vuid_tracker
.tracker_type
= TRACKER_VUID
;
186 session
->gid_tracker
.session
= session
;
187 session
->gid_tracker
.tracker_type
= TRACKER_GID
;
188 session
->vgid_tracker
.session
= session
;
189 session
->vgid_tracker
.tracker_type
= TRACKER_VGID
;
190 mutex_unlock(&sessions_mutex
);
194 kfree(metadata_cache
);
196 lttng_kvfree(session
);
198 mutex_unlock(&sessions_mutex
);
203 struct lttng_counter_transport
*lttng_counter_transport_find(const char *name
)
205 struct lttng_counter_transport
*transport
;
207 list_for_each_entry(transport
, <tng_counter_transport_list
, node
) {
208 if (!strcmp(transport
->name
, name
))
214 struct lttng_counter
*lttng_kernel_counter_create(
215 const char *counter_transport_name
,
216 size_t number_dimensions
, const size_t *dimensions_sizes
)
218 struct lttng_counter
*counter
= NULL
;
219 struct lttng_counter_transport
*counter_transport
= NULL
;
221 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
222 if (!counter_transport
) {
223 printk(KERN_WARNING
"LTTng: counter transport %s not found.\n",
224 counter_transport_name
);
227 if (!try_module_get(counter_transport
->owner
)) {
228 printk(KERN_WARNING
"LTTng: Can't lock counter transport module.\n");
232 counter
= lttng_kvzalloc(sizeof(struct lttng_counter
), GFP_KERNEL
);
236 /* Create event notifier error counter. */
237 counter
->ops
= &counter_transport
->ops
;
238 counter
->transport
= counter_transport
;
240 counter
->counter
= counter
->ops
->counter_create(
241 number_dimensions
, dimensions_sizes
, 0);
242 if (!counter
->counter
) {
249 lttng_kvfree(counter
);
251 if (counter_transport
)
252 module_put(counter_transport
->owner
);
257 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
259 struct lttng_transport
*transport
= NULL
;
260 struct lttng_event_notifier_group
*event_notifier_group
;
261 const char *transport_name
= "relay-event-notifier";
262 size_t subbuf_size
= 4096; //TODO
263 size_t num_subbuf
= 16; //TODO
264 unsigned int switch_timer_interval
= 0;
265 unsigned int read_timer_interval
= 0;
268 mutex_lock(&sessions_mutex
);
270 transport
= lttng_transport_find(transport_name
);
272 printk(KERN_WARNING
"LTTng: transport %s not found\n",
276 if (!try_module_get(transport
->owner
)) {
277 printk(KERN_WARNING
"LTTng: Can't lock transport %s module.\n",
282 event_notifier_group
= lttng_kvzalloc(sizeof(struct lttng_event_notifier_group
),
284 if (!event_notifier_group
)
288 * Initialize the ring buffer used to store event notifier
291 event_notifier_group
->ops
= &transport
->ops
;
292 event_notifier_group
->chan
= transport
->ops
.channel_create(
293 transport_name
, event_notifier_group
, NULL
,
294 subbuf_size
, num_subbuf
, switch_timer_interval
,
295 read_timer_interval
);
296 if (!event_notifier_group
->chan
)
299 event_notifier_group
->transport
= transport
;
301 INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
302 INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
303 for (i
= 0; i
< LTTNG_EVENT_NOTIFIER_HT_SIZE
; i
++)
304 INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
306 list_add(&event_notifier_group
->node
, &event_notifier_groups
);
308 mutex_unlock(&sessions_mutex
);
310 return event_notifier_group
;
313 lttng_kvfree(event_notifier_group
);
316 module_put(transport
->owner
);
318 mutex_unlock(&sessions_mutex
);
322 void metadata_cache_destroy(struct kref
*kref
)
324 struct lttng_metadata_cache
*cache
=
325 container_of(kref
, struct lttng_metadata_cache
, refcount
);
330 void lttng_session_destroy(struct lttng_session
*session
)
332 struct lttng_channel
*chan
, *tmpchan
;
333 struct lttng_event
*event
, *tmpevent
;
334 struct lttng_metadata_stream
*metadata_stream
;
335 struct lttng_event_enabler
*event_enabler
, *tmp_event_enabler
;
338 mutex_lock(&sessions_mutex
);
339 WRITE_ONCE(session
->active
, 0);
340 list_for_each_entry(chan
, &session
->chan
, list
) {
341 ret
= lttng_syscalls_unregister_channel(chan
);
344 list_for_each_entry(event
, &session
->events
, list
) {
345 ret
= _lttng_event_unregister(event
);
348 synchronize_trace(); /* Wait for in-flight events to complete */
349 list_for_each_entry(chan
, &session
->chan
, list
) {
350 ret
= lttng_syscalls_destroy_event(chan
);
353 list_for_each_entry_safe(event_enabler
, tmp_event_enabler
,
354 &session
->enablers_head
, node
)
355 lttng_event_enabler_destroy(event_enabler
);
356 list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
357 _lttng_event_destroy(event
);
358 list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
) {
359 BUG_ON(chan
->channel_type
== METADATA_CHANNEL
);
360 _lttng_channel_destroy(chan
);
362 mutex_lock(&session
->metadata_cache
->lock
);
363 list_for_each_entry(metadata_stream
, &session
->metadata_cache
->metadata_stream
, list
)
364 _lttng_metadata_channel_hangup(metadata_stream
);
365 mutex_unlock(&session
->metadata_cache
->lock
);
366 lttng_id_tracker_destroy(&session
->pid_tracker
, false);
367 lttng_id_tracker_destroy(&session
->vpid_tracker
, false);
368 lttng_id_tracker_destroy(&session
->uid_tracker
, false);
369 lttng_id_tracker_destroy(&session
->vuid_tracker
, false);
370 lttng_id_tracker_destroy(&session
->gid_tracker
, false);
371 lttng_id_tracker_destroy(&session
->vgid_tracker
, false);
372 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
373 list_del(&session
->list
);
374 mutex_unlock(&sessions_mutex
);
375 lttng_kvfree(session
);
378 void lttng_event_notifier_group_destroy(
379 struct lttng_event_notifier_group
*event_notifier_group
)
381 struct lttng_event_notifier_enabler
*event_notifier_enabler
, *tmp_event_notifier_enabler
;
382 struct lttng_event_notifier
*event_notifier
, *tmpevent_notifier
;
385 if (!event_notifier_group
)
388 mutex_lock(&sessions_mutex
);
390 ret
= lttng_syscalls_unregister_event_notifier_group(event_notifier_group
);
393 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
394 &event_notifier_group
->event_notifiers_head
, list
) {
395 ret
= _lttng_event_notifier_unregister(event_notifier
);
399 /* Wait for in-flight event notifier to complete */
402 irq_work_sync(&event_notifier_group
->wakeup_pending
);
404 kfree(event_notifier_group
->sc_filter
);
406 list_for_each_entry_safe(event_notifier_enabler
, tmp_event_notifier_enabler
,
407 &event_notifier_group
->enablers_head
, node
)
408 lttng_event_notifier_enabler_destroy(event_notifier_enabler
);
410 list_for_each_entry_safe(event_notifier
, tmpevent_notifier
,
411 &event_notifier_group
->event_notifiers_head
, list
)
412 _lttng_event_notifier_destroy(event_notifier
);
414 if (event_notifier_group
->error_counter
) {
415 struct lttng_counter
*error_counter
= event_notifier_group
->error_counter
;
417 error_counter
->ops
->counter_destroy(error_counter
->counter
);
418 module_put(error_counter
->transport
->owner
);
419 lttng_kvfree(error_counter
);
420 event_notifier_group
->error_counter
= NULL
;
423 event_notifier_group
->ops
->channel_destroy(event_notifier_group
->chan
);
424 module_put(event_notifier_group
->transport
->owner
);
425 list_del(&event_notifier_group
->node
);
427 mutex_unlock(&sessions_mutex
);
428 lttng_kvfree(event_notifier_group
);
431 int lttng_session_statedump(struct lttng_session
*session
)
435 mutex_lock(&sessions_mutex
);
436 ret
= lttng_statedump_start(session
);
437 mutex_unlock(&sessions_mutex
);
441 int lttng_session_enable(struct lttng_session
*session
)
444 struct lttng_channel
*chan
;
446 mutex_lock(&sessions_mutex
);
447 if (session
->active
) {
452 /* Set transient enabler state to "enabled" */
455 /* We need to sync enablers with session before activation. */
456 lttng_session_sync_event_enablers(session
);
459 * Snapshot the number of events per channel to know the type of header
462 list_for_each_entry(chan
, &session
->chan
, list
) {
463 if (chan
->header_type
)
464 continue; /* don't change it if session stop/restart */
465 if (chan
->free_event_id
< 31)
466 chan
->header_type
= 1; /* compact */
468 chan
->header_type
= 2; /* large */
471 /* Clear each stream's quiescent state. */
472 list_for_each_entry(chan
, &session
->chan
, list
) {
473 if (chan
->channel_type
!= METADATA_CHANNEL
)
474 lib_ring_buffer_clear_quiescent_channel(chan
->chan
);
477 WRITE_ONCE(session
->active
, 1);
478 WRITE_ONCE(session
->been_active
, 1);
479 ret
= _lttng_session_metadata_statedump(session
);
481 WRITE_ONCE(session
->active
, 0);
484 ret
= lttng_statedump_start(session
);
486 WRITE_ONCE(session
->active
, 0);
488 mutex_unlock(&sessions_mutex
);
492 int lttng_session_disable(struct lttng_session
*session
)
495 struct lttng_channel
*chan
;
497 mutex_lock(&sessions_mutex
);
498 if (!session
->active
) {
502 WRITE_ONCE(session
->active
, 0);
504 /* Set transient enabler state to "disabled" */
506 lttng_session_sync_event_enablers(session
);
508 /* Set each stream's quiescent state. */
509 list_for_each_entry(chan
, &session
->chan
, list
) {
510 if (chan
->channel_type
!= METADATA_CHANNEL
)
511 lib_ring_buffer_set_quiescent_channel(chan
->chan
);
514 mutex_unlock(&sessions_mutex
);
518 int lttng_session_metadata_regenerate(struct lttng_session
*session
)
521 struct lttng_channel
*chan
;
522 struct lttng_event
*event
;
523 struct lttng_metadata_cache
*cache
= session
->metadata_cache
;
524 struct lttng_metadata_stream
*stream
;
526 mutex_lock(&sessions_mutex
);
527 if (!session
->active
) {
532 mutex_lock(&cache
->lock
);
533 memset(cache
->data
, 0, cache
->cache_alloc
);
534 cache
->metadata_written
= 0;
536 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
) {
537 stream
->metadata_out
= 0;
538 stream
->metadata_in
= 0;
540 mutex_unlock(&cache
->lock
);
542 session
->metadata_dumped
= 0;
543 list_for_each_entry(chan
, &session
->chan
, list
) {
544 chan
->metadata_dumped
= 0;
547 list_for_each_entry(event
, &session
->events
, list
) {
548 event
->metadata_dumped
= 0;
551 ret
= _lttng_session_metadata_statedump(session
);
554 mutex_unlock(&sessions_mutex
);
558 int lttng_channel_enable(struct lttng_channel
*channel
)
562 mutex_lock(&sessions_mutex
);
563 if (channel
->channel_type
== METADATA_CHANNEL
) {
567 if (channel
->enabled
) {
571 /* Set transient enabler state to "enabled" */
573 lttng_session_sync_event_enablers(channel
->session
);
574 /* Set atomically the state to "enabled" */
575 WRITE_ONCE(channel
->enabled
, 1);
577 mutex_unlock(&sessions_mutex
);
581 int lttng_channel_disable(struct lttng_channel
*channel
)
585 mutex_lock(&sessions_mutex
);
586 if (channel
->channel_type
== METADATA_CHANNEL
) {
590 if (!channel
->enabled
) {
594 /* Set atomically the state to "disabled" */
595 WRITE_ONCE(channel
->enabled
, 0);
596 /* Set transient enabler state to "enabled" */
598 lttng_session_sync_event_enablers(channel
->session
);
600 mutex_unlock(&sessions_mutex
);
604 int lttng_event_enable(struct lttng_event
*event
)
608 mutex_lock(&sessions_mutex
);
609 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
613 if (event
->enabled
) {
617 switch (event
->instrumentation
) {
618 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
619 case LTTNG_KERNEL_SYSCALL
:
623 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
624 case LTTNG_KERNEL_UPROBE
:
625 WRITE_ONCE(event
->enabled
, 1);
628 case LTTNG_KERNEL_KRETPROBE
:
629 ret
= lttng_kretprobes_event_enable_state(event
, 1);
632 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
633 case LTTNG_KERNEL_NOOP
: /* Fall-through */
639 mutex_unlock(&sessions_mutex
);
643 int lttng_event_disable(struct lttng_event
*event
)
647 mutex_lock(&sessions_mutex
);
648 if (event
->chan
->channel_type
== METADATA_CHANNEL
) {
652 if (!event
->enabled
) {
656 switch (event
->instrumentation
) {
657 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
658 case LTTNG_KERNEL_SYSCALL
:
662 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
663 case LTTNG_KERNEL_UPROBE
:
664 WRITE_ONCE(event
->enabled
, 0);
667 case LTTNG_KERNEL_KRETPROBE
:
669 ret
= lttng_kretprobes_event_enable_state(event
, 0);
672 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
673 case LTTNG_KERNEL_NOOP
: /* Fall-through */
679 mutex_unlock(&sessions_mutex
);
683 int lttng_event_notifier_enable(struct lttng_event_notifier
*event_notifier
)
687 mutex_lock(&sessions_mutex
);
688 if (event_notifier
->enabled
) {
692 switch (event_notifier
->instrumentation
) {
693 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
694 case LTTNG_KERNEL_SYSCALL
:
698 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
699 case LTTNG_KERNEL_UPROBE
:
700 WRITE_ONCE(event_notifier
->enabled
, 1);
703 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
704 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
705 case LTTNG_KERNEL_NOOP
: /* Fall-through */
711 mutex_unlock(&sessions_mutex
);
715 int lttng_event_notifier_disable(struct lttng_event_notifier
*event_notifier
)
719 mutex_lock(&sessions_mutex
);
720 if (!event_notifier
->enabled
) {
724 switch (event_notifier
->instrumentation
) {
725 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
726 case LTTNG_KERNEL_SYSCALL
:
730 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
731 case LTTNG_KERNEL_UPROBE
:
732 WRITE_ONCE(event_notifier
->enabled
, 0);
735 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
736 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
737 case LTTNG_KERNEL_NOOP
: /* Fall-through */
743 mutex_unlock(&sessions_mutex
);
747 struct lttng_channel
*lttng_channel_create(struct lttng_session
*session
,
748 const char *transport_name
,
750 size_t subbuf_size
, size_t num_subbuf
,
751 unsigned int switch_timer_interval
,
752 unsigned int read_timer_interval
,
753 enum channel_type channel_type
)
755 struct lttng_channel
*chan
;
756 struct lttng_transport
*transport
= NULL
;
758 mutex_lock(&sessions_mutex
);
759 if (session
->been_active
&& channel_type
!= METADATA_CHANNEL
)
760 goto active
; /* Refuse to add channel to active session */
761 transport
= lttng_transport_find(transport_name
);
763 printk(KERN_WARNING
"LTTng: transport %s not found\n",
767 if (!try_module_get(transport
->owner
)) {
768 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
771 chan
= kzalloc(sizeof(struct lttng_channel
), GFP_KERNEL
);
774 chan
->session
= session
;
775 chan
->id
= session
->free_chan_id
++;
776 chan
->ops
= &transport
->ops
;
778 * Note: the channel creation op already writes into the packet
779 * headers. Therefore the "chan" information used as input
780 * should be already accessible.
782 chan
->chan
= transport
->ops
.channel_create(transport_name
,
783 chan
, buf_addr
, subbuf_size
, num_subbuf
,
784 switch_timer_interval
, read_timer_interval
);
789 chan
->transport
= transport
;
790 chan
->channel_type
= channel_type
;
791 list_add(&chan
->list
, &session
->chan
);
792 mutex_unlock(&sessions_mutex
);
799 module_put(transport
->owner
);
802 mutex_unlock(&sessions_mutex
);
807 * Only used internally at session destruction for per-cpu channels, and
808 * when metadata channel is released.
809 * Needs to be called with sessions mutex held.
812 void _lttng_channel_destroy(struct lttng_channel
*chan
)
814 chan
->ops
->channel_destroy(chan
->chan
);
815 module_put(chan
->transport
->owner
);
816 list_del(&chan
->list
);
817 lttng_destroy_context(chan
->ctx
);
821 void lttng_metadata_channel_destroy(struct lttng_channel
*chan
)
823 BUG_ON(chan
->channel_type
!= METADATA_CHANNEL
);
825 /* Protect the metadata cache with the sessions_mutex. */
826 mutex_lock(&sessions_mutex
);
827 _lttng_channel_destroy(chan
);
828 mutex_unlock(&sessions_mutex
);
830 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy
);
833 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream
*stream
)
835 stream
->finalized
= 1;
836 wake_up_interruptible(&stream
->read_wait
);
841 * Supports event creation while tracing session is active.
842 * Needs to be called with sessions mutex held.
844 struct lttng_event
*_lttng_event_create(struct lttng_channel
*chan
,
845 struct lttng_kernel_event
*event_param
,
847 const struct lttng_event_desc
*event_desc
,
848 enum lttng_kernel_instrumentation itype
)
850 struct lttng_session
*session
= chan
->session
;
851 struct lttng_event
*event
;
852 const char *event_name
;
853 struct hlist_head
*head
;
856 if (chan
->free_event_id
== -1U) {
862 case LTTNG_KERNEL_TRACEPOINT
:
863 event_name
= event_desc
->name
;
866 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
867 case LTTNG_KERNEL_UPROBE
: /* Fall-through */
868 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
869 case LTTNG_KERNEL_SYSCALL
:
870 event_name
= event_param
->name
;
873 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
874 case LTTNG_KERNEL_NOOP
: /* Fall-through */
881 head
= utils_borrow_hash_table_bucket(session
->events_ht
.table
,
882 LTTNG_EVENT_HT_SIZE
, event_name
);
883 lttng_hlist_for_each_entry(event
, head
, hlist
) {
884 WARN_ON_ONCE(!event
->desc
);
885 if (!strncmp(event
->desc
->name
, event_name
,
886 LTTNG_KERNEL_SYM_NAME_LEN
- 1)
887 && chan
== event
->chan
) {
893 event
= kmem_cache_zalloc(event_cache
, GFP_KERNEL
);
899 event
->filter
= filter
;
900 event
->id
= chan
->free_event_id
++;
901 event
->instrumentation
= itype
;
902 event
->evtype
= LTTNG_TYPE_EVENT
;
903 INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
904 INIT_LIST_HEAD(&event
->enablers_ref_head
);
907 case LTTNG_KERNEL_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_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_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_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_SYSCALL_ENTRYEXIT
:
1013 goto register_error
;
1014 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1015 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1017 case LTTNG_KERNEL_SYSCALL_EXIT
:
1018 event
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1021 switch (event_param
->u
.syscall
.abi
) {
1022 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1024 goto register_error
;
1025 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1026 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1028 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1029 event
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1034 goto register_error
;
1038 case LTTNG_KERNEL_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_FUNCTION
: /* Fall-through */
1062 case LTTNG_KERNEL_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_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_event_notifier
*event_notifier_param
,
1093 void *filter
, enum lttng_kernel_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_TRACEPOINT
:
1103 event_name
= event_desc
->name
;
1106 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
1107 case LTTNG_KERNEL_UPROBE
: /* Fall-through */
1108 case LTTNG_KERNEL_SYSCALL
:
1109 event_name
= event_notifier_param
->event
.name
;
1112 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1113 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1114 case LTTNG_KERNEL_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
->name
, event_name
,
1126 LTTNG_KERNEL_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
->evtype
= LTTNG_TYPE_EVENT
;
1147 event_notifier
->send_notification
= lttng_event_notifier_notification_send
;
1148 INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
1149 INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
1150 INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
1153 case LTTNG_KERNEL_TRACEPOINT
:
1154 /* Event will be enabled by enabler sync. */
1155 event_notifier
->enabled
= 0;
1156 event_notifier
->registered
= 0;
1157 event_notifier
->desc
= lttng_event_desc_get(event_name
);
1158 if (!event_notifier
->desc
) {
1160 goto register_error
;
1162 /* Populate lttng_event_notifier structure before event registration. */
1166 case LTTNG_KERNEL_KPROBE
:
1168 * Needs to be explicitly enabled after creation, since
1169 * we may want to apply filters.
1171 event_notifier
->enabled
= 0;
1172 event_notifier
->registered
= 1;
1174 * Populate lttng_event_notifier structure before event
1178 ret
= lttng_kprobes_register_event_notifier(
1179 event_notifier_param
->event
.u
.kprobe
.symbol_name
,
1180 event_notifier_param
->event
.u
.kprobe
.offset
,
1181 event_notifier_param
->event
.u
.kprobe
.addr
,
1185 goto register_error
;
1187 ret
= try_module_get(event_notifier
->desc
->owner
);
1191 case LTTNG_KERNEL_SYSCALL
:
1193 * Needs to be explicitly enabled after creation, since
1194 * we may want to apply filters.
1196 event_notifier
->enabled
= 0;
1197 event_notifier
->registered
= 0;
1198 event_notifier
->desc
= event_desc
;
1199 switch (event_notifier_param
->event
.u
.syscall
.entryexit
) {
1200 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1202 goto register_error
;
1203 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1204 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_ENTRY
;
1206 case LTTNG_KERNEL_SYSCALL_EXIT
:
1207 event_notifier
->u
.syscall
.entryexit
= LTTNG_SYSCALL_EXIT
;
1210 switch (event_notifier_param
->event
.u
.syscall
.abi
) {
1211 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1213 goto register_error
;
1214 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1215 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_NATIVE
;
1217 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1218 event_notifier
->u
.syscall
.abi
= LTTNG_SYSCALL_ABI_COMPAT
;
1222 if (!event_notifier
->desc
) {
1224 goto register_error
;
1228 case LTTNG_KERNEL_UPROBE
:
1230 * Needs to be explicitly enabled after creation, since
1231 * we may want to apply filters.
1233 event_notifier
->enabled
= 0;
1234 event_notifier
->registered
= 1;
1237 * Populate lttng_event_notifier structure before
1238 * event_notifier registration.
1242 ret
= lttng_uprobes_register_event_notifier(
1243 event_notifier_param
->event
.name
,
1244 event_notifier_param
->event
.u
.uprobe
.fd
,
1247 goto register_error
;
1248 ret
= try_module_get(event_notifier
->desc
->owner
);
1252 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1253 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1254 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1258 goto register_error
;
1261 list_add(&event_notifier
->list
, &event_notifier_group
->event_notifiers_head
);
1262 hlist_add_head(&event_notifier
->hlist
, head
);
1265 * Clear the error counter bucket. The sessiond keeps track of which
1266 * bucket is currently in use. We trust it. The session lock
1267 * synchronizes against concurrent creation of the error
1270 error_counter
= event_notifier_group
->error_counter
;
1271 if (error_counter
) {
1272 size_t dimension_index
[1];
1275 * Check that the index is within the boundary of the counter.
1277 if (event_notifier
->error_counter_index
>= event_notifier_group
->error_counter_len
) {
1278 printk(KERN_INFO
"LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n",
1279 event_notifier_group
->error_counter_len
, event_notifier
->error_counter_index
);
1281 goto register_error
;
1284 dimension_index
[0] = event_notifier
->error_counter_index
;
1285 ret
= error_counter
->ops
->counter_clear(error_counter
->counter
, dimension_index
);
1287 printk(KERN_INFO
"LTTng: event_notifier: Unable to clear error counter bucket %llu\n",
1288 event_notifier
->error_counter_index
);
1289 goto register_error
;
1293 return event_notifier
;
1296 kmem_cache_free(event_notifier_cache
, event_notifier
);
1300 return ERR_PTR(ret
);
1303 int lttng_kernel_counter_read(struct lttng_counter
*counter
,
1304 const size_t *dim_indexes
, int32_t cpu
,
1305 int64_t *val
, bool *overflow
, bool *underflow
)
1307 return counter
->ops
->counter_read(counter
->counter
, dim_indexes
,
1308 cpu
, val
, overflow
, underflow
);
1311 int lttng_kernel_counter_aggregate(struct lttng_counter
*counter
,
1312 const size_t *dim_indexes
, int64_t *val
,
1313 bool *overflow
, bool *underflow
)
1315 return counter
->ops
->counter_aggregate(counter
->counter
, dim_indexes
,
1316 val
, overflow
, underflow
);
1319 int lttng_kernel_counter_clear(struct lttng_counter
*counter
,
1320 const size_t *dim_indexes
)
1322 return counter
->ops
->counter_clear(counter
->counter
, dim_indexes
);
1325 struct lttng_event
*lttng_event_create(struct lttng_channel
*chan
,
1326 struct lttng_kernel_event
*event_param
,
1328 const struct lttng_event_desc
*event_desc
,
1329 enum lttng_kernel_instrumentation itype
)
1331 struct lttng_event
*event
;
1333 mutex_lock(&sessions_mutex
);
1334 event
= _lttng_event_create(chan
, event_param
, filter
, event_desc
,
1336 mutex_unlock(&sessions_mutex
);
1340 struct lttng_event_notifier
*lttng_event_notifier_create(
1341 const struct lttng_event_desc
*event_desc
,
1342 uint64_t id
, uint64_t error_counter_index
,
1343 struct lttng_event_notifier_group
*event_notifier_group
,
1344 struct lttng_kernel_event_notifier
*event_notifier_param
,
1345 void *filter
, enum lttng_kernel_instrumentation itype
)
1347 struct lttng_event_notifier
*event_notifier
;
1349 mutex_lock(&sessions_mutex
);
1350 event_notifier
= _lttng_event_notifier_create(event_desc
, id
,
1351 error_counter_index
, event_notifier_group
,
1352 event_notifier_param
, filter
, itype
);
1353 mutex_unlock(&sessions_mutex
);
1354 return event_notifier
;
1357 /* Only used for tracepoints for now. */
1359 void register_event(struct lttng_event
*event
)
1361 const struct lttng_event_desc
*desc
;
1364 if (event
->registered
)
1368 switch (event
->instrumentation
) {
1369 case LTTNG_KERNEL_TRACEPOINT
:
1370 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1371 desc
->probe_callback
,
1375 case LTTNG_KERNEL_SYSCALL
:
1376 ret
= lttng_syscall_filter_enable_event(event
->chan
, event
);
1379 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
1380 case LTTNG_KERNEL_UPROBE
: /* Fall-through */
1381 case LTTNG_KERNEL_KRETPROBE
:
1385 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1386 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1391 event
->registered
= 1;
1395 * Only used internally at session destruction.
1397 int _lttng_event_unregister(struct lttng_event
*event
)
1399 const struct lttng_event_desc
*desc
;
1402 if (!event
->registered
)
1406 switch (event
->instrumentation
) {
1407 case LTTNG_KERNEL_TRACEPOINT
:
1408 ret
= lttng_wrapper_tracepoint_probe_unregister(event
->desc
->kname
,
1409 event
->desc
->probe_callback
,
1413 case LTTNG_KERNEL_KPROBE
:
1414 lttng_kprobes_unregister_event(event
);
1418 case LTTNG_KERNEL_KRETPROBE
:
1419 lttng_kretprobes_unregister(event
);
1423 case LTTNG_KERNEL_SYSCALL
:
1424 ret
= lttng_syscall_filter_disable_event(event
->chan
, event
);
1427 case LTTNG_KERNEL_NOOP
:
1431 case LTTNG_KERNEL_UPROBE
:
1432 lttng_uprobes_unregister_event(event
);
1436 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1441 event
->registered
= 0;
1445 /* Only used for tracepoints for now. */
1447 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
1449 const struct lttng_event_desc
*desc
;
1452 if (event_notifier
->registered
)
1455 desc
= event_notifier
->desc
;
1456 switch (event_notifier
->instrumentation
) {
1457 case LTTNG_KERNEL_TRACEPOINT
:
1458 ret
= lttng_wrapper_tracepoint_probe_register(desc
->kname
,
1459 desc
->event_notifier_callback
,
1463 case LTTNG_KERNEL_SYSCALL
:
1464 ret
= lttng_syscall_filter_enable_event_notifier(event_notifier
);
1467 case LTTNG_KERNEL_KPROBE
: /* Fall-through */
1468 case LTTNG_KERNEL_UPROBE
:
1472 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1473 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1474 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1479 event_notifier
->registered
= 1;
1483 int _lttng_event_notifier_unregister(
1484 struct lttng_event_notifier
*event_notifier
)
1486 const struct lttng_event_desc
*desc
;
1489 if (!event_notifier
->registered
)
1492 desc
= event_notifier
->desc
;
1493 switch (event_notifier
->instrumentation
) {
1494 case LTTNG_KERNEL_TRACEPOINT
:
1495 ret
= lttng_wrapper_tracepoint_probe_unregister(event_notifier
->desc
->kname
,
1496 event_notifier
->desc
->event_notifier_callback
,
1500 case LTTNG_KERNEL_KPROBE
:
1501 lttng_kprobes_unregister_event_notifier(event_notifier
);
1505 case LTTNG_KERNEL_UPROBE
:
1506 lttng_uprobes_unregister_event_notifier(event_notifier
);
1510 case LTTNG_KERNEL_SYSCALL
:
1511 ret
= lttng_syscall_filter_disable_event_notifier(event_notifier
);
1514 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1515 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1516 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1521 event_notifier
->registered
= 0;
1526 * Only used internally at session destruction.
1529 void _lttng_event_destroy(struct lttng_event
*event
)
1531 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1533 switch (event
->instrumentation
) {
1534 case LTTNG_KERNEL_TRACEPOINT
:
1535 lttng_event_desc_put(event
->desc
);
1538 case LTTNG_KERNEL_KPROBE
:
1539 module_put(event
->desc
->owner
);
1540 lttng_kprobes_destroy_event_private(event
);
1543 case LTTNG_KERNEL_KRETPROBE
:
1544 module_put(event
->desc
->owner
);
1545 lttng_kretprobes_destroy_private(event
);
1548 case LTTNG_KERNEL_SYSCALL
:
1551 case LTTNG_KERNEL_UPROBE
:
1552 module_put(event
->desc
->owner
);
1553 lttng_uprobes_destroy_event_private(event
);
1556 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1557 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1561 list_del(&event
->list
);
1562 lttng_destroy_context(event
->ctx
);
1563 lttng_free_event_filter_runtime(event
);
1564 /* Free event enabler refs */
1565 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1566 &event
->enablers_ref_head
, node
)
1568 kmem_cache_free(event_cache
, event
);
1572 * Only used internally at session destruction.
1575 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
1577 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1579 switch (event_notifier
->instrumentation
) {
1580 case LTTNG_KERNEL_TRACEPOINT
:
1581 lttng_event_desc_put(event_notifier
->desc
);
1584 case LTTNG_KERNEL_KPROBE
:
1585 module_put(event_notifier
->desc
->owner
);
1586 lttng_kprobes_destroy_event_notifier_private(event_notifier
);
1589 case LTTNG_KERNEL_SYSCALL
:
1592 case LTTNG_KERNEL_UPROBE
:
1593 module_put(event_notifier
->desc
->owner
);
1594 lttng_uprobes_destroy_event_notifier_private(event_notifier
);
1597 case LTTNG_KERNEL_KRETPROBE
: /* Fall-through */
1598 case LTTNG_KERNEL_FUNCTION
: /* Fall-through */
1599 case LTTNG_KERNEL_NOOP
: /* Fall-through */
1603 list_del(&event_notifier
->list
);
1604 lttng_free_event_notifier_filter_runtime(event_notifier
);
1605 /* Free event enabler refs */
1606 list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1607 &event_notifier
->enablers_ref_head
, node
)
1609 kmem_cache_free(event_notifier_cache
, event_notifier
);
1612 struct lttng_id_tracker
*get_tracker(struct lttng_session
*session
,
1613 enum tracker_type tracker_type
)
1615 switch (tracker_type
) {
1617 return &session
->pid_tracker
;
1619 return &session
->vpid_tracker
;
1621 return &session
->uid_tracker
;
1623 return &session
->vuid_tracker
;
1625 return &session
->gid_tracker
;
1627 return &session
->vgid_tracker
;
1634 int lttng_session_track_id(struct lttng_session
*session
,
1635 enum tracker_type tracker_type
, int id
)
1637 struct lttng_id_tracker
*tracker
;
1640 tracker
= get_tracker(session
, tracker_type
);
1645 mutex_lock(&sessions_mutex
);
1647 /* track all ids: destroy tracker. */
1648 lttng_id_tracker_destroy(tracker
, true);
1651 ret
= lttng_id_tracker_add(tracker
, id
);
1653 mutex_unlock(&sessions_mutex
);
1657 int lttng_session_untrack_id(struct lttng_session
*session
,
1658 enum tracker_type tracker_type
, int id
)
1660 struct lttng_id_tracker
*tracker
;
1663 tracker
= get_tracker(session
, tracker_type
);
1668 mutex_lock(&sessions_mutex
);
1670 /* untrack all ids: replace by empty tracker. */
1671 ret
= lttng_id_tracker_empty_set(tracker
);
1673 ret
= lttng_id_tracker_del(tracker
, id
);
1675 mutex_unlock(&sessions_mutex
);
1680 void *id_list_start(struct seq_file
*m
, loff_t
*pos
)
1682 struct lttng_id_tracker
*id_tracker
= m
->private;
1683 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1684 struct lttng_id_hash_node
*e
;
1687 mutex_lock(&sessions_mutex
);
1689 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1690 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1692 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1698 /* ID tracker disabled. */
1699 if (iter
>= *pos
&& iter
== 0) {
1700 return id_tracker_p
; /* empty tracker */
1708 /* Called with sessions_mutex held. */
1710 void *id_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1712 struct lttng_id_tracker
*id_tracker
= m
->private;
1713 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1714 struct lttng_id_hash_node
*e
;
1719 for (i
= 0; i
< LTTNG_ID_TABLE_SIZE
; i
++) {
1720 struct hlist_head
*head
= &id_tracker_p
->id_hash
[i
];
1722 lttng_hlist_for_each_entry(e
, head
, hlist
) {
1723 if (iter
++ >= *ppos
)
1728 /* ID tracker disabled. */
1729 if (iter
>= *ppos
&& iter
== 0)
1730 return p
; /* empty tracker */
1739 void id_list_stop(struct seq_file
*m
, void *p
)
1741 mutex_unlock(&sessions_mutex
);
1745 int id_list_show(struct seq_file
*m
, void *p
)
1747 struct lttng_id_tracker
*id_tracker
= m
->private;
1748 struct lttng_id_tracker_rcu
*id_tracker_p
= id_tracker
->p
;
1751 if (p
== id_tracker_p
) {
1752 /* Tracker disabled. */
1755 const struct lttng_id_hash_node
*e
= p
;
1757 id
= lttng_id_tracker_get_node_id(e
);
1759 switch (id_tracker
->tracker_type
) {
1761 seq_printf(m
, "process { pid = %d; };\n", id
);
1764 seq_printf(m
, "process { vpid = %d; };\n", id
);
1767 seq_printf(m
, "user { uid = %d; };\n", id
);
1770 seq_printf(m
, "user { vuid = %d; };\n", id
);
1773 seq_printf(m
, "group { gid = %d; };\n", id
);
1776 seq_printf(m
, "group { vgid = %d; };\n", id
);
1779 seq_printf(m
, "UNKNOWN { field = %d };\n", id
);
1785 const struct seq_operations lttng_tracker_ids_list_seq_ops
= {
1786 .start
= id_list_start
,
1787 .next
= id_list_next
,
1788 .stop
= id_list_stop
,
1789 .show
= id_list_show
,
1793 int lttng_tracker_ids_list_open(struct inode
*inode
, struct file
*file
)
1795 return seq_open(file
, <tng_tracker_ids_list_seq_ops
);
1799 int lttng_tracker_ids_list_release(struct inode
*inode
, struct file
*file
)
1801 struct seq_file
*m
= file
->private_data
;
1802 struct lttng_id_tracker
*id_tracker
= m
->private;
1805 WARN_ON_ONCE(!id_tracker
);
1806 ret
= seq_release(inode
, file
);
1808 fput(id_tracker
->session
->file
);
1812 const struct file_operations lttng_tracker_ids_list_fops
= {
1813 .owner
= THIS_MODULE
,
1814 .open
= lttng_tracker_ids_list_open
,
1816 .llseek
= seq_lseek
,
1817 .release
= lttng_tracker_ids_list_release
,
1820 int lttng_session_list_tracker_ids(struct lttng_session
*session
,
1821 enum tracker_type tracker_type
)
1823 struct file
*tracker_ids_list_file
;
1827 file_fd
= lttng_get_unused_fd();
1833 tracker_ids_list_file
= anon_inode_getfile("[lttng_tracker_ids_list]",
1834 <tng_tracker_ids_list_fops
,
1836 if (IS_ERR(tracker_ids_list_file
)) {
1837 ret
= PTR_ERR(tracker_ids_list_file
);
1840 if (!atomic_long_add_unless(&session
->file
->f_count
, 1, LONG_MAX
)) {
1842 goto refcount_error
;
1844 ret
= lttng_tracker_ids_list_fops
.open(NULL
, tracker_ids_list_file
);
1847 m
= tracker_ids_list_file
->private_data
;
1849 m
->private = get_tracker(session
, tracker_type
);
1850 BUG_ON(!m
->private);
1851 fd_install(file_fd
, tracker_ids_list_file
);
1856 atomic_long_dec(&session
->file
->f_count
);
1858 fput(tracker_ids_list_file
);
1860 put_unused_fd(file_fd
);
1866 * Enabler management.
1869 int lttng_match_enabler_star_glob(const char *desc_name
,
1870 const char *pattern
)
1872 if (!strutils_star_glob_match(pattern
, LTTNG_SIZE_MAX
,
1873 desc_name
, LTTNG_SIZE_MAX
))
1879 int lttng_match_enabler_name(const char *desc_name
,
1882 if (strcmp(desc_name
, name
))
1887 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
1888 struct lttng_enabler
*enabler
)
1890 const char *desc_name
, *enabler_name
;
1891 bool compat
= false, entry
= false;
1893 enabler_name
= enabler
->event_param
.name
;
1894 switch (enabler
->event_param
.instrumentation
) {
1895 case LTTNG_KERNEL_TRACEPOINT
:
1896 desc_name
= desc
->name
;
1897 switch (enabler
->format_type
) {
1898 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1899 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1900 case LTTNG_ENABLER_FORMAT_NAME
:
1901 return lttng_match_enabler_name(desc_name
, enabler_name
);
1907 case LTTNG_KERNEL_SYSCALL
:
1908 desc_name
= desc
->name
;
1909 if (!strncmp(desc_name
, "compat_", strlen("compat_"))) {
1910 desc_name
+= strlen("compat_");
1913 if (!strncmp(desc_name
, "syscall_exit_",
1914 strlen("syscall_exit_"))) {
1915 desc_name
+= strlen("syscall_exit_");
1916 } else if (!strncmp(desc_name
, "syscall_entry_",
1917 strlen("syscall_entry_"))) {
1918 desc_name
+= strlen("syscall_entry_");
1924 switch (enabler
->event_param
.u
.syscall
.entryexit
) {
1925 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT
:
1927 case LTTNG_KERNEL_SYSCALL_ENTRY
:
1931 case LTTNG_KERNEL_SYSCALL_EXIT
:
1938 switch (enabler
->event_param
.u
.syscall
.abi
) {
1939 case LTTNG_KERNEL_SYSCALL_ABI_ALL
:
1941 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE
:
1945 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT
:
1952 switch (enabler
->event_param
.u
.syscall
.match
) {
1953 case LTTNG_KERNEL_SYSCALL_MATCH_NAME
:
1954 switch (enabler
->format_type
) {
1955 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
1956 return lttng_match_enabler_star_glob(desc_name
, enabler_name
);
1957 case LTTNG_ENABLER_FORMAT_NAME
:
1958 return lttng_match_enabler_name(desc_name
, enabler_name
);
1963 case LTTNG_KERNEL_SYSCALL_MATCH_NR
:
1964 return -EINVAL
; /* Not implemented. */
1977 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
1978 struct lttng_event
*event
)
1980 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(
1983 if (base_enabler
->event_param
.instrumentation
!= event
->instrumentation
)
1985 if (lttng_desc_match_enabler(event
->desc
, base_enabler
)
1986 && event
->chan
== event_enabler
->chan
)
1993 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1994 struct lttng_event_notifier
*event_notifier
)
1996 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
1997 event_notifier_enabler
);
1999 if (base_enabler
->event_param
.instrumentation
!= event_notifier
->instrumentation
)
2001 if (lttng_desc_match_enabler(event_notifier
->desc
, base_enabler
)
2002 && event_notifier
->group
== event_notifier_enabler
->group
2003 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2010 struct lttng_enabler_ref
*lttng_enabler_ref(
2011 struct list_head
*enablers_ref_list
,
2012 struct lttng_enabler
*enabler
)
2014 struct lttng_enabler_ref
*enabler_ref
;
2016 list_for_each_entry(enabler_ref
, enablers_ref_list
, node
) {
2017 if (enabler_ref
->ref
== enabler
)
2024 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2026 struct lttng_session
*session
= event_enabler
->chan
->session
;
2027 struct lttng_probe_desc
*probe_desc
;
2028 const struct lttng_event_desc
*desc
;
2030 struct list_head
*probe_list
;
2032 probe_list
= lttng_get_probe_list_head();
2034 * For each probe event, if we find that a probe event matches
2035 * our enabler, create an associated lttng_event if not
2038 list_for_each_entry(probe_desc
, probe_list
, head
) {
2039 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2041 struct hlist_head
*head
;
2042 struct lttng_event
*event
;
2044 desc
= probe_desc
->event_desc
[i
];
2045 if (!lttng_desc_match_enabler(desc
,
2046 lttng_event_enabler_as_enabler(event_enabler
)))
2050 * Check if already created.
2052 head
= utils_borrow_hash_table_bucket(
2053 session
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
2055 lttng_hlist_for_each_entry(event
, head
, hlist
) {
2056 if (event
->desc
== desc
2057 && event
->chan
== event_enabler
->chan
)
2064 * We need to create an event for this
2067 event
= _lttng_event_create(event_enabler
->chan
,
2069 LTTNG_KERNEL_TRACEPOINT
);
2071 printk(KERN_INFO
"LTTng: Unable to create event %s\n",
2072 probe_desc
->event_desc
[i
]->name
);
2079 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2081 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2082 struct lttng_probe_desc
*probe_desc
;
2083 const struct lttng_event_desc
*desc
;
2085 struct list_head
*probe_list
;
2087 probe_list
= lttng_get_probe_list_head();
2089 * For each probe event, if we find that a probe event matches
2090 * our enabler, create an associated lttng_event_notifier if not
2093 list_for_each_entry(probe_desc
, probe_list
, head
) {
2094 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
2096 struct hlist_head
*head
;
2097 struct lttng_event_notifier
*event_notifier
;
2099 desc
= probe_desc
->event_desc
[i
];
2100 if (!lttng_desc_match_enabler(desc
,
2101 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
2105 * Check if already created.
2107 head
= utils_borrow_hash_table_bucket(
2108 event_notifier_group
->event_notifiers_ht
.table
,
2109 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->name
);
2110 lttng_hlist_for_each_entry(event_notifier
, head
, hlist
) {
2111 if (event_notifier
->desc
== desc
2112 && event_notifier
->user_token
== event_notifier_enabler
->base
.user_token
)
2119 * We need to create a event_notifier for this event probe.
2121 event_notifier
= _lttng_event_notifier_create(desc
,
2122 event_notifier_enabler
->base
.user_token
,
2123 event_notifier_enabler
->error_counter_index
,
2124 event_notifier_group
, NULL
, NULL
,
2125 LTTNG_KERNEL_TRACEPOINT
);
2126 if (IS_ERR(event_notifier
)) {
2127 printk(KERN_INFO
"Unable to create event_notifier %s\n",
2128 probe_desc
->event_desc
[i
]->name
);
2135 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2139 ret
= lttng_syscalls_register_event(event_enabler
, NULL
);
2144 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2148 ret
= lttng_syscalls_register_event_notifier(event_notifier_enabler
, NULL
);
2150 ret
= lttng_syscals_create_matching_event_notifiers(event_notifier_enabler
, NULL
);
2155 * Create struct lttng_event if it is missing and present in the list of
2156 * tracepoint probes.
2157 * Should be called with sessions mutex held.
2160 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
2162 switch (event_enabler
->base
.event_param
.instrumentation
) {
2163 case LTTNG_KERNEL_TRACEPOINT
:
2164 lttng_create_tracepoint_event_if_missing(event_enabler
);
2167 case LTTNG_KERNEL_SYSCALL
:
2168 lttng_create_syscall_event_if_missing(event_enabler
);
2178 * Create events associated with an event_enabler (if not already present),
2179 * and add backward reference from the event to the enabler.
2180 * Should be called with sessions mutex held.
2183 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
2185 struct lttng_channel
*chan
= event_enabler
->chan
;
2186 struct lttng_session
*session
= event_enabler
->chan
->session
;
2187 struct lttng_enabler
*base_enabler
= lttng_event_enabler_as_enabler(event_enabler
);
2188 struct lttng_event
*event
;
2190 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2191 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2192 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2193 !strcmp(base_enabler
->event_param
.name
, "*")) {
2194 int enabled
= base_enabler
->enabled
;
2195 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2197 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2198 WRITE_ONCE(chan
->syscall_all_entry
, enabled
);
2200 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2201 WRITE_ONCE(chan
->syscall_all_exit
, enabled
);
2204 /* First ensure that probe events are created for this enabler. */
2205 lttng_create_event_if_missing(event_enabler
);
2207 /* For each event matching event_enabler in session event list. */
2208 list_for_each_entry(event
, &session
->events
, list
) {
2209 struct lttng_enabler_ref
*enabler_ref
;
2211 if (!lttng_event_enabler_match_event(event_enabler
, event
))
2213 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
2214 lttng_event_enabler_as_enabler(event_enabler
));
2217 * If no backward ref, create it.
2218 * Add backward ref from event to event_enabler.
2220 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2223 enabler_ref
->ref
= lttng_event_enabler_as_enabler(event_enabler
);
2224 list_add(&enabler_ref
->node
,
2225 &event
->enablers_ref_head
);
2229 * Link filter bytecodes if not linked yet.
2231 lttng_enabler_link_bytecode(event
->desc
,
2233 &event
->filter_bytecode_runtime_head
,
2234 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
2236 /* TODO: merge event context. */
2242 * Create struct lttng_event_notifier if it is missing and present in the list of
2243 * tracepoint probes.
2244 * Should be called with sessions mutex held.
2247 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2249 switch (event_notifier_enabler
->base
.event_param
.instrumentation
) {
2250 case LTTNG_KERNEL_TRACEPOINT
:
2251 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler
);
2254 case LTTNG_KERNEL_SYSCALL
:
2255 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler
);
2265 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2268 int lttng_event_notifier_enabler_ref_event_notifiers(
2269 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2271 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
2272 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2273 struct lttng_event_notifier
*event_notifier
;
2275 if (base_enabler
->event_param
.instrumentation
== LTTNG_KERNEL_SYSCALL
&&
2276 base_enabler
->event_param
.u
.syscall
.abi
== LTTNG_KERNEL_SYSCALL_ABI_ALL
&&
2277 base_enabler
->event_param
.u
.syscall
.match
== LTTNG_KERNEL_SYSCALL_MATCH_NAME
&&
2278 !strcmp(base_enabler
->event_param
.name
, "*")) {
2280 int enabled
= base_enabler
->enabled
;
2281 enum lttng_kernel_syscall_entryexit entryexit
= base_enabler
->event_param
.u
.syscall
.entryexit
;
2283 if (entryexit
== LTTNG_KERNEL_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2284 WRITE_ONCE(event_notifier_group
->syscall_all_entry
, enabled
);
2286 if (entryexit
== LTTNG_KERNEL_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_SYSCALL_ENTRYEXIT
)
2287 WRITE_ONCE(event_notifier_group
->syscall_all_exit
, enabled
);
2291 /* First ensure that probe event_notifiers are created for this enabler. */
2292 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
2294 /* Link the created event_notifier with its associated enabler. */
2295 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2296 struct lttng_enabler_ref
*enabler_ref
;
2298 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
2301 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
2302 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2305 * If no backward ref, create it.
2306 * Add backward ref from event_notifier to enabler.
2308 enabler_ref
= kzalloc(sizeof(*enabler_ref
), GFP_KERNEL
);
2312 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
2313 event_notifier_enabler
);
2314 list_add(&enabler_ref
->node
,
2315 &event_notifier
->enablers_ref_head
);
2319 * Link filter bytecodes if not linked yet.
2321 lttng_enabler_link_bytecode(event_notifier
->desc
,
2322 lttng_static_ctx
, &event_notifier
->filter_bytecode_runtime_head
,
2323 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
2325 /* Link capture bytecodes if not linked yet. */
2326 lttng_enabler_link_bytecode(event_notifier
->desc
,
2327 lttng_static_ctx
, &event_notifier
->capture_bytecode_runtime_head
,
2328 &event_notifier_enabler
->capture_bytecode_head
);
2330 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
2336 * Called at module load: connect the probe on all enablers matching
2338 * Called with sessions lock held.
2340 int lttng_fix_pending_events(void)
2342 struct lttng_session
*session
;
2344 list_for_each_entry(session
, &sessions
, list
)
2345 lttng_session_lazy_sync_event_enablers(session
);
2349 static bool lttng_event_notifier_group_has_active_event_notifiers(
2350 struct lttng_event_notifier_group
*event_notifier_group
)
2352 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2354 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
,
2356 if (event_notifier_enabler
->base
.enabled
)
2362 bool lttng_event_notifier_active(void)
2364 struct lttng_event_notifier_group
*event_notifier_group
;
2366 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
2367 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group
))
2373 int lttng_fix_pending_event_notifiers(void)
2375 struct lttng_event_notifier_group
*event_notifier_group
;
2377 list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
)
2378 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
2382 struct lttng_event_enabler
*lttng_event_enabler_create(
2383 enum lttng_enabler_format_type format_type
,
2384 struct lttng_kernel_event
*event_param
,
2385 struct lttng_channel
*chan
)
2387 struct lttng_event_enabler
*event_enabler
;
2389 event_enabler
= kzalloc(sizeof(*event_enabler
), GFP_KERNEL
);
2392 event_enabler
->base
.format_type
= format_type
;
2393 INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
2394 memcpy(&event_enabler
->base
.event_param
, event_param
,
2395 sizeof(event_enabler
->base
.event_param
));
2396 event_enabler
->chan
= chan
;
2398 event_enabler
->base
.enabled
= 0;
2399 event_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2400 mutex_lock(&sessions_mutex
);
2401 list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
2402 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2403 mutex_unlock(&sessions_mutex
);
2404 return event_enabler
;
2407 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
2409 mutex_lock(&sessions_mutex
);
2410 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
2411 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2412 mutex_unlock(&sessions_mutex
);
2416 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
2418 mutex_lock(&sessions_mutex
);
2419 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
2420 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2421 mutex_unlock(&sessions_mutex
);
2426 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
2427 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2429 struct lttng_bytecode_node
*bytecode_node
;
2430 uint32_t bytecode_len
;
2433 ret
= get_user(bytecode_len
, &bytecode
->len
);
2436 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2440 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2441 sizeof(*bytecode
) + bytecode_len
);
2445 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_FILTER
;
2446 bytecode_node
->enabler
= enabler
;
2447 /* Enforce length based on allocated size */
2448 bytecode_node
->bc
.len
= bytecode_len
;
2449 list_add_tail(&bytecode_node
->node
, &enabler
->filter_bytecode_head
);
2454 lttng_kvfree(bytecode_node
);
2458 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
2459 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2462 ret
= lttng_enabler_attach_filter_bytecode(
2463 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
2467 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
2474 int lttng_event_add_callsite(struct lttng_event
*event
,
2475 struct lttng_kernel_event_callsite __user
*callsite
)
2478 switch (event
->instrumentation
) {
2479 case LTTNG_KERNEL_UPROBE
:
2480 return lttng_uprobes_event_add_callsite(event
, callsite
);
2486 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*event_enabler
,
2487 struct lttng_kernel_context
*context_param
)
2493 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
2495 struct lttng_bytecode_node
*filter_node
, *tmp_filter_node
;
2497 /* Destroy filter bytecode */
2498 list_for_each_entry_safe(filter_node
, tmp_filter_node
,
2499 &enabler
->filter_bytecode_head
, node
) {
2500 lttng_kvfree(filter_node
);
2505 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
2507 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
2509 /* Destroy contexts */
2510 lttng_destroy_context(event_enabler
->ctx
);
2512 list_del(&event_enabler
->node
);
2513 kfree(event_enabler
);
2516 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
2517 struct lttng_event_notifier_group
*event_notifier_group
,
2518 enum lttng_enabler_format_type format_type
,
2519 struct lttng_kernel_event_notifier
*event_notifier_param
)
2521 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2523 event_notifier_enabler
= kzalloc(sizeof(*event_notifier_enabler
), GFP_KERNEL
);
2524 if (!event_notifier_enabler
)
2527 event_notifier_enabler
->base
.format_type
= format_type
;
2528 INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
2529 INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
2531 event_notifier_enabler
->error_counter_index
= event_notifier_param
->error_counter_index
;
2532 event_notifier_enabler
->num_captures
= 0;
2534 memcpy(&event_notifier_enabler
->base
.event_param
, &event_notifier_param
->event
,
2535 sizeof(event_notifier_enabler
->base
.event_param
));
2536 event_notifier_enabler
->base
.evtype
= LTTNG_TYPE_ENABLER
;
2538 event_notifier_enabler
->base
.enabled
= 0;
2539 event_notifier_enabler
->base
.user_token
= event_notifier_param
->event
.token
;
2540 event_notifier_enabler
->group
= event_notifier_group
;
2542 mutex_lock(&sessions_mutex
);
2543 list_add(&event_notifier_enabler
->node
, &event_notifier_enabler
->group
->enablers_head
);
2544 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2546 mutex_unlock(&sessions_mutex
);
2548 return event_notifier_enabler
;
2551 int lttng_event_notifier_enabler_enable(
2552 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2554 mutex_lock(&sessions_mutex
);
2555 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
2556 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2557 mutex_unlock(&sessions_mutex
);
2561 int lttng_event_notifier_enabler_disable(
2562 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2564 mutex_lock(&sessions_mutex
);
2565 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
2566 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2567 mutex_unlock(&sessions_mutex
);
2571 int lttng_event_notifier_enabler_attach_filter_bytecode(
2572 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2573 struct lttng_kernel_filter_bytecode __user
*bytecode
)
2577 ret
= lttng_enabler_attach_filter_bytecode(
2578 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
2583 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2590 int lttng_event_notifier_enabler_attach_capture_bytecode(
2591 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2592 struct lttng_kernel_capture_bytecode __user
*bytecode
)
2594 struct lttng_bytecode_node
*bytecode_node
;
2595 struct lttng_enabler
*enabler
=
2596 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
2597 uint32_t bytecode_len
;
2600 ret
= get_user(bytecode_len
, &bytecode
->len
);
2604 bytecode_node
= lttng_kvzalloc(sizeof(*bytecode_node
) + bytecode_len
,
2609 ret
= copy_from_user(&bytecode_node
->bc
, bytecode
,
2610 sizeof(*bytecode
) + bytecode_len
);
2614 bytecode_node
->type
= LTTNG_BYTECODE_NODE_TYPE_CAPTURE
;
2615 bytecode_node
->enabler
= enabler
;
2617 /* Enforce length based on allocated size */
2618 bytecode_node
->bc
.len
= bytecode_len
;
2619 list_add_tail(&bytecode_node
->node
, &event_notifier_enabler
->capture_bytecode_head
);
2621 event_notifier_enabler
->num_captures
++;
2623 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
2627 lttng_kvfree(bytecode_node
);
2632 int lttng_event_notifier_add_callsite(struct lttng_event_notifier
*event_notifier
,
2633 struct lttng_kernel_event_callsite __user
*callsite
)
2636 switch (event_notifier
->instrumentation
) {
2637 case LTTNG_KERNEL_UPROBE
:
2638 return lttng_uprobes_event_notifier_add_callsite(event_notifier
,
2645 int lttng_event_notifier_enabler_attach_context(
2646 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
2647 struct lttng_kernel_context
*context_param
)
2653 void lttng_event_notifier_enabler_destroy(
2654 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
2656 if (!event_notifier_enabler
) {
2660 list_del(&event_notifier_enabler
->node
);
2662 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
2663 kfree(event_notifier_enabler
);
2667 * lttng_session_sync_event_enablers should be called just before starting a
2669 * Should be called with sessions mutex held.
2672 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
2674 struct lttng_event_enabler
*event_enabler
;
2675 struct lttng_event
*event
;
2677 list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
2678 lttng_event_enabler_ref_events(event_enabler
);
2680 * For each event, if at least one of its enablers is enabled,
2681 * and its channel and session transient states are enabled, we
2682 * enable the event, else we disable it.
2684 list_for_each_entry(event
, &session
->events
, list
) {
2685 struct lttng_enabler_ref
*enabler_ref
;
2686 struct lttng_bytecode_runtime
*runtime
;
2687 int enabled
= 0, has_enablers_without_bytecode
= 0;
2689 switch (event
->instrumentation
) {
2690 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
2691 case LTTNG_KERNEL_SYSCALL
:
2693 list_for_each_entry(enabler_ref
,
2694 &event
->enablers_ref_head
, node
) {
2695 if (enabler_ref
->ref
->enabled
) {
2703 /* Not handled with lazy sync. */
2707 * Enabled state is based on union of enablers, with
2708 * intesection of session and channel transient enable
2711 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
2713 WRITE_ONCE(event
->enabled
, enabled
);
2715 * Sync tracepoint registration with event enabled
2719 register_event(event
);
2721 _lttng_event_unregister(event
);
2724 /* Check if has enablers without bytecode enabled */
2725 list_for_each_entry(enabler_ref
,
2726 &event
->enablers_ref_head
, node
) {
2727 if (enabler_ref
->ref
->enabled
2728 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2729 has_enablers_without_bytecode
= 1;
2733 event
->has_enablers_without_bytecode
=
2734 has_enablers_without_bytecode
;
2736 /* Enable filters */
2737 list_for_each_entry(runtime
,
2738 &event
->filter_bytecode_runtime_head
, node
)
2739 lttng_bytecode_filter_sync_state(runtime
);
2744 * Apply enablers to session events, adding events to session if need
2745 * be. It is required after each modification applied to an active
2746 * session, and right before session "start".
2747 * "lazy" sync means we only sync if required.
2748 * Should be called with sessions mutex held.
2751 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
2753 /* We can skip if session is not active */
2754 if (!session
->active
)
2756 lttng_session_sync_event_enablers(session
);
2760 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
2762 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
2763 struct lttng_event_notifier
*event_notifier
;
2765 list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
2766 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
2769 * For each event_notifier, if at least one of its enablers is enabled,
2770 * we enable the event_notifier, else we disable it.
2772 list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, list
) {
2773 struct lttng_enabler_ref
*enabler_ref
;
2774 struct lttng_bytecode_runtime
*runtime
;
2775 int enabled
= 0, has_enablers_without_bytecode
= 0;
2777 switch (event_notifier
->instrumentation
) {
2778 case LTTNG_KERNEL_TRACEPOINT
: /* Fall-through */
2779 case LTTNG_KERNEL_SYSCALL
:
2780 /* Enable event_notifiers */
2781 list_for_each_entry(enabler_ref
,
2782 &event_notifier
->enablers_ref_head
, node
) {
2783 if (enabler_ref
->ref
->enabled
) {
2791 /* Not handled with sync. */
2795 WRITE_ONCE(event_notifier
->enabled
, enabled
);
2797 * Sync tracepoint registration with event_notifier enabled
2801 if (!event_notifier
->registered
)
2802 register_event_notifier(event_notifier
);
2804 if (event_notifier
->registered
)
2805 _lttng_event_notifier_unregister(event_notifier
);
2808 /* Check if has enablers without bytecode enabled */
2809 list_for_each_entry(enabler_ref
,
2810 &event_notifier
->enablers_ref_head
, node
) {
2811 if (enabler_ref
->ref
->enabled
2812 && list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
2813 has_enablers_without_bytecode
= 1;
2817 event_notifier
->has_enablers_without_bytecode
=
2818 has_enablers_without_bytecode
;
2820 /* Enable filters */
2821 list_for_each_entry(runtime
,
2822 &event_notifier
->filter_bytecode_runtime_head
, node
)
2823 lttng_bytecode_filter_sync_state(runtime
);
2825 /* Enable captures */
2826 list_for_each_entry(runtime
,
2827 &event_notifier
->capture_bytecode_runtime_head
, node
)
2828 lttng_bytecode_capture_sync_state(runtime
);
2830 WRITE_ONCE(event_notifier
->eval_capture
, !!event_notifier
->num_captures
);
2835 * Serialize at most one packet worth of metadata into a metadata
2837 * We grab the metadata cache mutex to get exclusive access to our metadata
2838 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2839 * allows us to do racy operations such as looking for remaining space left in
2840 * packet and write, since mutual exclusion protects us from concurrent writes.
2841 * Mutual exclusion on the metadata cache allow us to read the cache content
2842 * without racing against reallocation of the cache by updates.
2843 * Returns the number of bytes written in the channel, 0 if no data
2844 * was written and a negative value on error.
2846 int lttng_metadata_output_channel(struct lttng_metadata_stream
*stream
,
2847 struct channel
*chan
, bool *coherent
)
2849 struct lib_ring_buffer_ctx ctx
;
2851 size_t len
, reserve_len
;
2854 * Ensure we support mutiple get_next / put sequences followed by
2855 * put_next. The metadata cache lock protects reading the metadata
2856 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2857 * "flush" operations on the buffer invoked by different processes.
2858 * Moreover, since the metadata cache memory can be reallocated, we
2859 * need to have exclusive access against updates even though we only
2862 mutex_lock(&stream
->metadata_cache
->lock
);
2863 WARN_ON(stream
->metadata_in
< stream
->metadata_out
);
2864 if (stream
->metadata_in
!= stream
->metadata_out
)
2867 /* Metadata regenerated, change the version. */
2868 if (stream
->metadata_cache
->version
!= stream
->version
)
2869 stream
->version
= stream
->metadata_cache
->version
;
2871 len
= stream
->metadata_cache
->metadata_written
-
2872 stream
->metadata_in
;
2875 reserve_len
= min_t(size_t,
2876 stream
->transport
->ops
.packet_avail_size(chan
),
2878 lib_ring_buffer_ctx_init(&ctx
, chan
, NULL
, reserve_len
,
2881 * If reservation failed, return an error to the caller.
2883 ret
= stream
->transport
->ops
.event_reserve(&ctx
, 0);
2885 printk(KERN_WARNING
"LTTng: Metadata event reservation failed\n");
2886 stream
->coherent
= false;
2889 stream
->transport
->ops
.event_write(&ctx
,
2890 stream
->metadata_cache
->data
+ stream
->metadata_in
,
2892 stream
->transport
->ops
.event_commit(&ctx
);
2893 stream
->metadata_in
+= reserve_len
;
2894 if (reserve_len
< len
)
2895 stream
->coherent
= false;
2897 stream
->coherent
= true;
2902 *coherent
= stream
->coherent
;
2903 mutex_unlock(&stream
->metadata_cache
->lock
);
2908 void lttng_metadata_begin(struct lttng_session
*session
)
2910 if (atomic_inc_return(&session
->metadata_cache
->producing
) == 1)
2911 mutex_lock(&session
->metadata_cache
->lock
);
2915 void lttng_metadata_end(struct lttng_session
*session
)
2917 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2918 if (atomic_dec_return(&session
->metadata_cache
->producing
) == 0) {
2919 struct lttng_metadata_stream
*stream
;
2921 list_for_each_entry(stream
, &session
->metadata_cache
->metadata_stream
, list
)
2922 wake_up_interruptible(&stream
->read_wait
);
2923 mutex_unlock(&session
->metadata_cache
->lock
);
2928 * Write the metadata to the metadata cache.
2929 * Must be called with sessions_mutex held.
2930 * The metadata cache lock protects us from concurrent read access from
2931 * thread outputting metadata content to ring buffer.
2932 * The content of the printf is printed as a single atomic metadata
2935 int lttng_metadata_printf(struct lttng_session
*session
,
2936 const char *fmt
, ...)
2942 WARN_ON_ONCE(!LTTNG_READ_ONCE(session
->active
));
2945 str
= kvasprintf(GFP_KERNEL
, fmt
, ap
);
2951 WARN_ON_ONCE(!atomic_read(&session
->metadata_cache
->producing
));
2952 if (session
->metadata_cache
->metadata_written
+ len
>
2953 session
->metadata_cache
->cache_alloc
) {
2954 char *tmp_cache_realloc
;
2955 unsigned int tmp_cache_alloc_size
;
2957 tmp_cache_alloc_size
= max_t(unsigned int,
2958 session
->metadata_cache
->cache_alloc
+ len
,
2959 session
->metadata_cache
->cache_alloc
<< 1);
2960 tmp_cache_realloc
= vzalloc(tmp_cache_alloc_size
);
2961 if (!tmp_cache_realloc
)
2963 if (session
->metadata_cache
->data
) {
2964 memcpy(tmp_cache_realloc
,
2965 session
->metadata_cache
->data
,
2966 session
->metadata_cache
->cache_alloc
);
2967 vfree(session
->metadata_cache
->data
);
2970 session
->metadata_cache
->cache_alloc
= tmp_cache_alloc_size
;
2971 session
->metadata_cache
->data
= tmp_cache_realloc
;
2973 memcpy(session
->metadata_cache
->data
+
2974 session
->metadata_cache
->metadata_written
,
2976 session
->metadata_cache
->metadata_written
+= len
;
2987 int print_tabs(struct lttng_session
*session
, size_t nesting
)
2991 for (i
= 0; i
< nesting
; i
++) {
2994 ret
= lttng_metadata_printf(session
, " ");
3003 int lttng_field_name_statedump(struct lttng_session
*session
,
3004 const struct lttng_event_field
*field
,
3007 return lttng_metadata_printf(session
, " _%s;\n", field
->name
);
3011 int _lttng_integer_type_statedump(struct lttng_session
*session
,
3012 const struct lttng_type
*type
,
3017 WARN_ON_ONCE(type
->type
!= lttng_kernel_type_integer
);
3018 ret
= print_tabs(session
, nesting
);
3021 ret
= lttng_metadata_printf(session
,
3022 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
3023 type
->u
.integer
.size
,
3024 type
->u
.integer
.alignment
,
3025 type
->u
.integer
.signedness
,
3026 (type
->u
.integer
.encoding
== lttng_kernel_string_encoding_none
)
3028 : (type
->u
.integer
.encoding
== lttng_kernel_string_encoding_UTF8
)
3031 type
->u
.integer
.base
,
3032 #if __BYTE_ORDER == __BIG_ENDIAN
3033 type
->u
.integer
.reverse_byte_order
? " byte_order = le;" : ""
3035 type
->u
.integer
.reverse_byte_order
? " byte_order = be;" : ""
3042 * Must be called with sessions_mutex held.
3045 int _lttng_struct_type_statedump(struct lttng_session
*session
,
3046 const struct lttng_type
*type
,
3050 uint32_t i
, nr_fields
;
3051 unsigned int alignment
;
3053 WARN_ON_ONCE(type
->type
!= lttng_kernel_type_struct_nestable
);
3055 ret
= print_tabs(session
, nesting
);
3058 ret
= lttng_metadata_printf(session
,
3062 nr_fields
= type
->u
.struct_nestable
.nr_fields
;
3063 for (i
= 0; i
< nr_fields
; i
++) {
3064 const struct lttng_event_field
*iter_field
;
3066 iter_field
= &type
->u
.struct_nestable
.fields
[i
];
3067 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3071 ret
= print_tabs(session
, nesting
);
3074 alignment
= type
->u
.struct_nestable
.alignment
;
3076 ret
= lttng_metadata_printf(session
,
3080 ret
= lttng_metadata_printf(session
,
3087 * Must be called with sessions_mutex held.
3090 int _lttng_struct_field_statedump(struct lttng_session
*session
,
3091 const struct lttng_event_field
*field
,
3096 ret
= _lttng_struct_type_statedump(session
,
3097 &field
->type
, nesting
);
3100 return lttng_field_name_statedump(session
, field
, nesting
);
3104 * Must be called with sessions_mutex held.
3107 int _lttng_variant_type_statedump(struct lttng_session
*session
,
3108 const struct lttng_type
*type
,
3112 uint32_t i
, nr_choices
;
3114 WARN_ON_ONCE(type
->type
!= lttng_kernel_type_variant_nestable
);
3116 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
3118 if (type
->u
.variant_nestable
.alignment
!= 0)
3120 ret
= print_tabs(session
, nesting
);
3123 ret
= lttng_metadata_printf(session
,
3124 "variant <_%s> {\n",
3125 type
->u
.variant_nestable
.tag_name
);
3128 nr_choices
= type
->u
.variant_nestable
.nr_choices
;
3129 for (i
= 0; i
< nr_choices
; i
++) {
3130 const struct lttng_event_field
*iter_field
;
3132 iter_field
= &type
->u
.variant_nestable
.choices
[i
];
3133 ret
= _lttng_field_statedump(session
, iter_field
, nesting
+ 1);
3137 ret
= print_tabs(session
, nesting
);
3140 ret
= lttng_metadata_printf(session
,
3146 * Must be called with sessions_mutex held.
3149 int _lttng_variant_field_statedump(struct lttng_session
*session
,
3150 const struct lttng_event_field
*field
,
3155 ret
= _lttng_variant_type_statedump(session
,
3156 &field
->type
, nesting
);
3159 return lttng_field_name_statedump(session
, field
, nesting
);
3163 * Must be called with sessions_mutex held.
3166 int _lttng_array_field_statedump(struct lttng_session
*session
,
3167 const struct lttng_event_field
*field
,
3171 const struct lttng_type
*elem_type
;
3173 WARN_ON_ONCE(field
->type
.type
!= lttng_kernel_type_array_nestable
);
3175 if (field
->type
.u
.array_nestable
.alignment
) {
3176 ret
= print_tabs(session
, nesting
);
3179 ret
= lttng_metadata_printf(session
,
3180 "struct { } align(%u) _%s_padding;\n",
3181 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
3187 * Nested compound types: Only array of structures and variants are
3188 * currently supported.
3190 elem_type
= field
->type
.u
.array_nestable
.elem_type
;
3191 switch (elem_type
->type
) {
3192 case lttng_kernel_type_integer
:
3193 case lttng_kernel_type_struct_nestable
:
3194 case lttng_kernel_type_variant_nestable
:
3195 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3203 ret
= lttng_metadata_printf(session
,
3206 field
->type
.u
.array_nestable
.length
);
3211 * Must be called with sessions_mutex held.
3214 int _lttng_sequence_field_statedump(struct lttng_session
*session
,
3215 const struct lttng_event_field
*field
,
3219 const char *length_name
;
3220 const struct lttng_type
*elem_type
;
3222 WARN_ON_ONCE(field
->type
.type
!= lttng_kernel_type_sequence_nestable
);
3224 length_name
= field
->type
.u
.sequence_nestable
.length_name
;
3226 if (field
->type
.u
.sequence_nestable
.alignment
) {
3227 ret
= print_tabs(session
, nesting
);
3230 ret
= lttng_metadata_printf(session
,
3231 "struct { } align(%u) _%s_padding;\n",
3232 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
3239 * Nested compound types: Only array of structures and variants are
3240 * currently supported.
3242 elem_type
= field
->type
.u
.sequence_nestable
.elem_type
;
3243 switch (elem_type
->type
) {
3244 case lttng_kernel_type_integer
:
3245 case lttng_kernel_type_struct_nestable
:
3246 case lttng_kernel_type_variant_nestable
:
3247 ret
= _lttng_type_statedump(session
, elem_type
, nesting
);
3255 ret
= lttng_metadata_printf(session
,
3258 field
->type
.u
.sequence_nestable
.length_name
);
3263 * Must be called with sessions_mutex held.
3266 int _lttng_enum_type_statedump(struct lttng_session
*session
,
3267 const struct lttng_type
*type
,
3270 const struct lttng_enum_desc
*enum_desc
;
3271 const struct lttng_type
*container_type
;
3273 unsigned int i
, nr_entries
;
3275 container_type
= type
->u
.enum_nestable
.container_type
;
3276 if (container_type
->type
!= lttng_kernel_type_integer
) {
3280 enum_desc
= type
->u
.enum_nestable
.desc
;
3281 nr_entries
= enum_desc
->nr_entries
;
3283 ret
= print_tabs(session
, nesting
);
3286 ret
= lttng_metadata_printf(session
, "enum : ");
3289 ret
= _lttng_integer_type_statedump(session
, container_type
, 0);
3292 ret
= lttng_metadata_printf(session
, " {\n");
3295 /* Dump all entries */
3296 for (i
= 0; i
< nr_entries
; i
++) {
3297 const struct lttng_kernel_enum_entry
*entry
= &enum_desc
->entries
[i
];
3300 ret
= print_tabs(session
, nesting
+ 1);
3303 ret
= lttng_metadata_printf(session
,
3307 len
= strlen(entry
->string
);
3308 /* Escape the character '"' */
3309 for (j
= 0; j
< len
; j
++) {
3310 char c
= entry
->string
[j
];
3314 ret
= lttng_metadata_printf(session
,
3318 ret
= lttng_metadata_printf(session
,
3322 ret
= lttng_metadata_printf(session
,
3329 ret
= lttng_metadata_printf(session
, "\"");
3333 if (entry
->options
.is_auto
) {
3334 ret
= lttng_metadata_printf(session
, ",\n");
3338 ret
= lttng_metadata_printf(session
,
3342 if (entry
->start
.signedness
)
3343 ret
= lttng_metadata_printf(session
,
3344 "%lld", (long long) entry
->start
.value
);
3346 ret
= lttng_metadata_printf(session
,
3347 "%llu", entry
->start
.value
);
3350 if (entry
->start
.signedness
== entry
->end
.signedness
&&
3352 == entry
->end
.value
) {
3353 ret
= lttng_metadata_printf(session
,
3356 if (entry
->end
.signedness
) {
3357 ret
= lttng_metadata_printf(session
,
3359 (long long) entry
->end
.value
);
3361 ret
= lttng_metadata_printf(session
,
3370 ret
= print_tabs(session
, nesting
);
3373 ret
= lttng_metadata_printf(session
, "}");
3379 * Must be called with sessions_mutex held.
3382 int _lttng_enum_field_statedump(struct lttng_session
*session
,
3383 const struct lttng_event_field
*field
,
3388 ret
= _lttng_enum_type_statedump(session
, &field
->type
, nesting
);
3391 return lttng_field_name_statedump(session
, field
, nesting
);
3395 int _lttng_integer_field_statedump(struct lttng_session
*session
,
3396 const struct lttng_event_field
*field
,
3401 ret
= _lttng_integer_type_statedump(session
, &field
->type
, nesting
);
3404 return lttng_field_name_statedump(session
, field
, nesting
);
3408 int _lttng_string_type_statedump(struct lttng_session
*session
,
3409 const struct lttng_type
*type
,
3414 WARN_ON_ONCE(type
->type
!= lttng_kernel_type_string
);
3415 /* Default encoding is UTF8 */
3416 ret
= print_tabs(session
, nesting
);
3419 ret
= lttng_metadata_printf(session
,
3421 type
->u
.string
.encoding
== lttng_kernel_string_encoding_ASCII
?
3422 " { encoding = ASCII; }" : "");
3427 int _lttng_string_field_statedump(struct lttng_session
*session
,
3428 const struct lttng_event_field
*field
,
3433 WARN_ON_ONCE(field
->type
.type
!= lttng_kernel_type_string
);
3434 ret
= _lttng_string_type_statedump(session
, &field
->type
, nesting
);
3437 return lttng_field_name_statedump(session
, field
, nesting
);
3441 * Must be called with sessions_mutex held.
3444 int _lttng_type_statedump(struct lttng_session
*session
,
3445 const struct lttng_type
*type
,
3450 switch (type
->type
) {
3451 case lttng_kernel_type_integer
:
3452 ret
= _lttng_integer_type_statedump(session
, type
, nesting
);
3454 case lttng_kernel_type_enum_nestable
:
3455 ret
= _lttng_enum_type_statedump(session
, type
, nesting
);
3457 case lttng_kernel_type_string
:
3458 ret
= _lttng_string_type_statedump(session
, type
, nesting
);
3460 case lttng_kernel_type_struct_nestable
:
3461 ret
= _lttng_struct_type_statedump(session
, type
, nesting
);
3463 case lttng_kernel_type_variant_nestable
:
3464 ret
= _lttng_variant_type_statedump(session
, type
, nesting
);
3467 /* Nested arrays and sequences are not supported yet. */
3468 case lttng_kernel_type_array_nestable
:
3469 case lttng_kernel_type_sequence_nestable
:
3478 * Must be called with sessions_mutex held.
3481 int _lttng_field_statedump(struct lttng_session
*session
,
3482 const struct lttng_event_field
*field
,
3487 switch (field
->type
.type
) {
3488 case lttng_kernel_type_integer
:
3489 ret
= _lttng_integer_field_statedump(session
, field
, nesting
);
3491 case lttng_kernel_type_enum_nestable
:
3492 ret
= _lttng_enum_field_statedump(session
, field
, nesting
);
3494 case lttng_kernel_type_string
:
3495 ret
= _lttng_string_field_statedump(session
, field
, nesting
);
3497 case lttng_kernel_type_struct_nestable
:
3498 ret
= _lttng_struct_field_statedump(session
, field
, nesting
);
3500 case lttng_kernel_type_array_nestable
:
3501 ret
= _lttng_array_field_statedump(session
, field
, nesting
);
3503 case lttng_kernel_type_sequence_nestable
:
3504 ret
= _lttng_sequence_field_statedump(session
, field
, nesting
);
3506 case lttng_kernel_type_variant_nestable
:
3507 ret
= _lttng_variant_field_statedump(session
, field
, nesting
);
3518 int _lttng_context_metadata_statedump(struct lttng_session
*session
,
3519 struct lttng_ctx
*ctx
)
3526 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
3527 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
3529 ret
= _lttng_field_statedump(session
, &field
->event_field
, 2);
3537 int _lttng_fields_metadata_statedump(struct lttng_session
*session
,
3538 struct lttng_event
*event
)
3540 const struct lttng_event_desc
*desc
= event
->desc
;
3544 for (i
= 0; i
< desc
->nr_fields
; i
++) {
3545 const struct lttng_event_field
*field
= &desc
->fields
[i
];
3547 ret
= _lttng_field_statedump(session
, field
, 2);
3555 * Must be called with sessions_mutex held.
3556 * The entire event metadata is printed as a single atomic metadata
3560 int _lttng_event_metadata_statedump(struct lttng_session
*session
,
3561 struct lttng_channel
*chan
,
3562 struct lttng_event
*event
)
3566 if (event
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3568 if (chan
->channel_type
== METADATA_CHANNEL
)
3571 lttng_metadata_begin(session
);
3573 ret
= lttng_metadata_printf(session
,
3577 " stream_id = %u;\n",
3585 ret
= lttng_metadata_printf(session
,
3586 " context := struct {\n");
3590 ret
= _lttng_context_metadata_statedump(session
, event
->ctx
);
3594 ret
= lttng_metadata_printf(session
,
3600 ret
= lttng_metadata_printf(session
,
3601 " fields := struct {\n"
3606 ret
= _lttng_fields_metadata_statedump(session
, event
);
3611 * LTTng space reservation can only reserve multiples of the
3614 ret
= lttng_metadata_printf(session
,
3620 event
->metadata_dumped
= 1;
3622 lttng_metadata_end(session
);
3628 * Must be called with sessions_mutex held.
3629 * The entire channel metadata is printed as a single atomic metadata
3633 int _lttng_channel_metadata_statedump(struct lttng_session
*session
,
3634 struct lttng_channel
*chan
)
3638 if (chan
->metadata_dumped
|| !LTTNG_READ_ONCE(session
->active
))
3641 if (chan
->channel_type
== METADATA_CHANNEL
)
3644 lttng_metadata_begin(session
);
3646 WARN_ON_ONCE(!chan
->header_type
);
3647 ret
= lttng_metadata_printf(session
,
3650 " event.header := %s;\n"
3651 " packet.context := struct packet_context;\n",
3653 chan
->header_type
== 1 ? "struct event_header_compact" :
3654 "struct event_header_large");
3659 ret
= lttng_metadata_printf(session
,
3660 " event.context := struct {\n");
3664 ret
= _lttng_context_metadata_statedump(session
, chan
->ctx
);
3668 ret
= lttng_metadata_printf(session
,
3674 ret
= lttng_metadata_printf(session
,
3677 chan
->metadata_dumped
= 1;
3679 lttng_metadata_end(session
);
3684 * Must be called with sessions_mutex held.
3687 int _lttng_stream_packet_context_declare(struct lttng_session
*session
)
3689 return lttng_metadata_printf(session
,
3690 "struct packet_context {\n"
3691 " uint64_clock_monotonic_t timestamp_begin;\n"
3692 " uint64_clock_monotonic_t timestamp_end;\n"
3693 " uint64_t content_size;\n"
3694 " uint64_t packet_size;\n"
3695 " uint64_t packet_seq_num;\n"
3696 " unsigned long events_discarded;\n"
3697 " uint32_t cpu_id;\n"
3704 * id: range: 0 - 30.
3705 * id 31 is reserved to indicate an extended header.
3708 * id: range: 0 - 65534.
3709 * id 65535 is reserved to indicate an extended header.
3711 * Must be called with sessions_mutex held.
3714 int _lttng_event_header_declare(struct lttng_session
*session
)
3716 return lttng_metadata_printf(session
,
3717 "struct event_header_compact {\n"
3718 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3721 " uint27_clock_monotonic_t timestamp;\n"
3725 " uint64_clock_monotonic_t timestamp;\n"
3730 "struct event_header_large {\n"
3731 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3734 " uint32_clock_monotonic_t timestamp;\n"
3738 " uint64_clock_monotonic_t timestamp;\n"
3742 lttng_alignof(uint32_t) * CHAR_BIT
,
3743 lttng_alignof(uint16_t) * CHAR_BIT
3748 * Approximation of NTP time of day to clock monotonic correlation,
3749 * taken at start of trace.
3750 * Yes, this is only an approximation. Yes, we can (and will) do better
3751 * in future versions.
3752 * This function may return a negative offset. It may happen if the
3753 * system sets the REALTIME clock to 0 after boot.
3755 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3759 int64_t measure_clock_offset(void)
3761 uint64_t monotonic_avg
, monotonic
[2], realtime
;
3762 uint64_t tcf
= trace_clock_freq();
3764 unsigned long flags
;
3765 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3766 struct timespec64 rts
= { 0, 0 };
3768 struct timespec rts
= { 0, 0 };
3771 /* Disable interrupts to increase correlation precision. */
3772 local_irq_save(flags
);
3773 monotonic
[0] = trace_clock_read64();
3774 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3775 ktime_get_real_ts64(&rts
);
3777 getnstimeofday(&rts
);
3779 monotonic
[1] = trace_clock_read64();
3780 local_irq_restore(flags
);
3782 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
3783 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
3784 if (tcf
== NSEC_PER_SEC
) {
3785 realtime
+= rts
.tv_nsec
;
3787 uint64_t n
= rts
.tv_nsec
* tcf
;
3789 do_div(n
, NSEC_PER_SEC
);
3792 offset
= (int64_t) realtime
- monotonic_avg
;
3797 int print_escaped_ctf_string(struct lttng_session
*session
, const char *string
)
3805 while (cur
!= '\0') {
3808 ret
= lttng_metadata_printf(session
, "%s", "\\n");
3812 ret
= lttng_metadata_printf(session
, "%c", '\\');
3815 /* We still print the current char */
3818 ret
= lttng_metadata_printf(session
, "%c", cur
);
3832 int print_metadata_escaped_field(struct lttng_session
*session
, const char *field
,
3833 const char *field_value
)
3837 ret
= lttng_metadata_printf(session
, " %s = \"", field
);
3841 ret
= print_escaped_ctf_string(session
, field_value
);
3845 ret
= lttng_metadata_printf(session
, "\";\n");
3852 * Output metadata into this session's metadata buffers.
3853 * Must be called with sessions_mutex held.
3856 int _lttng_session_metadata_statedump(struct lttng_session
*session
)
3858 unsigned char *uuid_c
= session
->uuid
.b
;
3859 unsigned char uuid_s
[37], clock_uuid_s
[BOOT_ID_LEN
];
3860 const char *product_uuid
;
3861 struct lttng_channel
*chan
;
3862 struct lttng_event
*event
;
3865 if (!LTTNG_READ_ONCE(session
->active
))
3868 lttng_metadata_begin(session
);
3870 if (session
->metadata_dumped
)
3873 snprintf(uuid_s
, sizeof(uuid_s
),
3874 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3875 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
3876 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
3877 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
3878 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
3880 ret
= lttng_metadata_printf(session
,
3881 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3882 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3883 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3884 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3885 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3886 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3887 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3893 " byte_order = %s;\n"
3894 " packet.header := struct {\n"
3895 " uint32_t magic;\n"
3896 " uint8_t uuid[16];\n"
3897 " uint32_t stream_id;\n"
3898 " uint64_t stream_instance_id;\n"
3901 lttng_alignof(uint8_t) * CHAR_BIT
,
3902 lttng_alignof(uint16_t) * CHAR_BIT
,
3903 lttng_alignof(uint32_t) * CHAR_BIT
,
3904 lttng_alignof(uint64_t) * CHAR_BIT
,
3905 sizeof(unsigned long) * CHAR_BIT
,
3906 lttng_alignof(unsigned long) * CHAR_BIT
,
3910 #if __BYTE_ORDER == __BIG_ENDIAN
3919 ret
= lttng_metadata_printf(session
,
3921 " hostname = \"%s\";\n"
3922 " domain = \"kernel\";\n"
3923 " sysname = \"%s\";\n"
3924 " kernel_release = \"%s\";\n"
3925 " kernel_version = \"%s\";\n"
3926 " tracer_name = \"lttng-modules\";\n"
3927 " tracer_major = %d;\n"
3928 " tracer_minor = %d;\n"
3929 " tracer_patchlevel = %d;\n"
3930 " trace_buffering_scheme = \"global\";\n",
3931 current
->nsproxy
->uts_ns
->name
.nodename
,
3935 LTTNG_MODULES_MAJOR_VERSION
,
3936 LTTNG_MODULES_MINOR_VERSION
,
3937 LTTNG_MODULES_PATCHLEVEL_VERSION
3942 ret
= print_metadata_escaped_field(session
, "trace_name", session
->name
);
3945 ret
= print_metadata_escaped_field(session
, "trace_creation_datetime",
3946 session
->creation_time
);
3950 /* Add the product UUID to the 'env' section */
3951 product_uuid
= dmi_get_system_info(DMI_PRODUCT_UUID
);
3953 ret
= lttng_metadata_printf(session
,
3954 " product_uuid = \"%s\";\n",
3961 /* Close the 'env' section */
3962 ret
= lttng_metadata_printf(session
, "};\n\n");
3966 ret
= lttng_metadata_printf(session
,
3968 " name = \"%s\";\n",
3974 if (!trace_clock_uuid(clock_uuid_s
)) {
3975 ret
= lttng_metadata_printf(session
,
3976 " uuid = \"%s\";\n",
3983 ret
= lttng_metadata_printf(session
,
3984 " description = \"%s\";\n"
3985 " freq = %llu; /* Frequency, in Hz */\n"
3986 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3989 trace_clock_description(),
3990 (unsigned long long) trace_clock_freq(),
3991 (long long) measure_clock_offset()
3996 ret
= lttng_metadata_printf(session
,
3997 "typealias integer {\n"
3998 " size = 27; align = 1; signed = false;\n"
3999 " map = clock.%s.value;\n"
4000 "} := uint27_clock_monotonic_t;\n"
4002 "typealias integer {\n"
4003 " size = 32; align = %u; signed = false;\n"
4004 " map = clock.%s.value;\n"
4005 "} := uint32_clock_monotonic_t;\n"
4007 "typealias integer {\n"
4008 " size = 64; align = %u; signed = false;\n"
4009 " map = clock.%s.value;\n"
4010 "} := uint64_clock_monotonic_t;\n\n",
4012 lttng_alignof(uint32_t) * CHAR_BIT
,
4014 lttng_alignof(uint64_t) * CHAR_BIT
,
4020 ret
= _lttng_stream_packet_context_declare(session
);
4024 ret
= _lttng_event_header_declare(session
);
4029 list_for_each_entry(chan
, &session
->chan
, list
) {
4030 ret
= _lttng_channel_metadata_statedump(session
, chan
);
4035 list_for_each_entry(event
, &session
->events
, list
) {
4036 ret
= _lttng_event_metadata_statedump(session
, event
->chan
, event
);
4040 session
->metadata_dumped
= 1;
4042 lttng_metadata_end(session
);
4047 * lttng_transport_register - LTT transport registration
4048 * @transport: transport structure
4050 * Registers a transport which can be used as output to extract the data out of
4051 * LTTng. The module calling this registration function must ensure that no
4052 * trap-inducing code will be executed by the transport functions. E.g.
4053 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
4054 * is made visible to the transport function. This registration acts as a
4055 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
4056 * after its registration must it synchronize the TLBs.
4058 void lttng_transport_register(struct lttng_transport
*transport
)
4061 * Make sure no page fault can be triggered by the module about to be
4062 * registered. We deal with this here so we don't have to call
4063 * vmalloc_sync_mappings() in each module's init.
4065 wrapper_vmalloc_sync_mappings();
4067 mutex_lock(&sessions_mutex
);
4068 list_add_tail(&transport
->node
, <tng_transport_list
);
4069 mutex_unlock(&sessions_mutex
);
4071 EXPORT_SYMBOL_GPL(lttng_transport_register
);
4074 * lttng_transport_unregister - LTT transport unregistration
4075 * @transport: transport structure
4077 void lttng_transport_unregister(struct lttng_transport
*transport
)
4079 mutex_lock(&sessions_mutex
);
4080 list_del(&transport
->node
);
4081 mutex_unlock(&sessions_mutex
);
4083 EXPORT_SYMBOL_GPL(lttng_transport_unregister
);
4085 void lttng_counter_transport_register(struct lttng_counter_transport
*transport
)
4088 * Make sure no page fault can be triggered by the module about to be
4089 * registered. We deal with this here so we don't have to call
4090 * vmalloc_sync_mappings() in each module's init.
4092 wrapper_vmalloc_sync_mappings();
4094 mutex_lock(&sessions_mutex
);
4095 list_add_tail(&transport
->node
, <tng_counter_transport_list
);
4096 mutex_unlock(&sessions_mutex
);
4098 EXPORT_SYMBOL_GPL(lttng_counter_transport_register
);
4100 void lttng_counter_transport_unregister(struct lttng_counter_transport
*transport
)
4102 mutex_lock(&sessions_mutex
);
4103 list_del(&transport
->node
);
4104 mutex_unlock(&sessions_mutex
);
4106 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister
);
4108 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
4110 enum cpuhp_state lttng_hp_prepare
;
4111 enum cpuhp_state lttng_hp_online
;
4113 static int lttng_hotplug_prepare(unsigned int cpu
, struct hlist_node
*node
)
4115 struct lttng_cpuhp_node
*lttng_node
;
4117 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4118 switch (lttng_node
->component
) {
4119 case LTTNG_RING_BUFFER_FRONTEND
:
4121 case LTTNG_RING_BUFFER_BACKEND
:
4122 return lttng_cpuhp_rb_backend_prepare(cpu
, lttng_node
);
4123 case LTTNG_RING_BUFFER_ITER
:
4125 case LTTNG_CONTEXT_PERF_COUNTERS
:
4132 static int lttng_hotplug_dead(unsigned int cpu
, struct hlist_node
*node
)
4134 struct lttng_cpuhp_node
*lttng_node
;
4136 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4137 switch (lttng_node
->component
) {
4138 case LTTNG_RING_BUFFER_FRONTEND
:
4139 return lttng_cpuhp_rb_frontend_dead(cpu
, lttng_node
);
4140 case LTTNG_RING_BUFFER_BACKEND
:
4142 case LTTNG_RING_BUFFER_ITER
:
4144 case LTTNG_CONTEXT_PERF_COUNTERS
:
4145 return lttng_cpuhp_perf_counter_dead(cpu
, lttng_node
);
4151 static int lttng_hotplug_online(unsigned int cpu
, struct hlist_node
*node
)
4153 struct lttng_cpuhp_node
*lttng_node
;
4155 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4156 switch (lttng_node
->component
) {
4157 case LTTNG_RING_BUFFER_FRONTEND
:
4158 return lttng_cpuhp_rb_frontend_online(cpu
, lttng_node
);
4159 case LTTNG_RING_BUFFER_BACKEND
:
4161 case LTTNG_RING_BUFFER_ITER
:
4162 return lttng_cpuhp_rb_iter_online(cpu
, lttng_node
);
4163 case LTTNG_CONTEXT_PERF_COUNTERS
:
4164 return lttng_cpuhp_perf_counter_online(cpu
, lttng_node
);
4170 static int lttng_hotplug_offline(unsigned int cpu
, struct hlist_node
*node
)
4172 struct lttng_cpuhp_node
*lttng_node
;
4174 lttng_node
= container_of(node
, struct lttng_cpuhp_node
, node
);
4175 switch (lttng_node
->component
) {
4176 case LTTNG_RING_BUFFER_FRONTEND
:
4177 return lttng_cpuhp_rb_frontend_offline(cpu
, lttng_node
);
4178 case LTTNG_RING_BUFFER_BACKEND
:
4180 case LTTNG_RING_BUFFER_ITER
:
4182 case LTTNG_CONTEXT_PERF_COUNTERS
:
4189 static int __init
lttng_init_cpu_hotplug(void)
4193 ret
= cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN
, "lttng:prepare",
4194 lttng_hotplug_prepare
,
4195 lttng_hotplug_dead
);
4199 lttng_hp_prepare
= ret
;
4200 lttng_rb_set_hp_prepare(ret
);
4202 ret
= cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN
, "lttng:online",
4203 lttng_hotplug_online
,
4204 lttng_hotplug_offline
);
4206 cpuhp_remove_multi_state(lttng_hp_prepare
);
4207 lttng_hp_prepare
= 0;
4210 lttng_hp_online
= ret
;
4211 lttng_rb_set_hp_online(ret
);
4216 static void __exit
lttng_exit_cpu_hotplug(void)
4218 lttng_rb_set_hp_online(0);
4219 cpuhp_remove_multi_state(lttng_hp_online
);
4220 lttng_rb_set_hp_prepare(0);
4221 cpuhp_remove_multi_state(lttng_hp_prepare
);
4224 #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4225 static int lttng_init_cpu_hotplug(void)
4229 static void lttng_exit_cpu_hotplug(void)
4232 #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */
4235 static int __init
lttng_events_init(void)
4239 ret
= wrapper_lttng_fixup_sig(THIS_MODULE
);
4242 ret
= wrapper_get_pfnblock_flags_mask_init();
4245 ret
= wrapper_get_pageblock_flags_mask_init();
4248 ret
= lttng_probes_init();
4251 ret
= lttng_context_init();
4254 ret
= lttng_tracepoint_init();
4257 event_cache
= KMEM_CACHE(lttng_event
, 0);
4260 goto error_kmem_event
;
4262 event_notifier_cache
= KMEM_CACHE(lttng_event_notifier
, 0);
4263 if (!event_notifier_cache
) {
4265 goto error_kmem_event_notifier
;
4267 ret
= lttng_abi_init();
4270 ret
= lttng_logger_init();
4273 ret
= lttng_init_cpu_hotplug();
4276 printk(KERN_NOTICE
"LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4277 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4278 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4279 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4280 LTTNG_MODULES_EXTRAVERSION
,
4282 #ifdef LTTNG_EXTRA_VERSION_GIT
4283 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4287 #ifdef LTTNG_EXTRA_VERSION_NAME
4288 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4295 lttng_logger_exit();
4299 kmem_cache_destroy(event_notifier_cache
);
4300 error_kmem_event_notifier
:
4301 kmem_cache_destroy(event_cache
);
4303 lttng_tracepoint_exit();
4305 lttng_context_exit();
4306 printk(KERN_NOTICE
"LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4307 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4308 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4309 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4310 LTTNG_MODULES_EXTRAVERSION
,
4312 #ifdef LTTNG_EXTRA_VERSION_GIT
4313 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4317 #ifdef LTTNG_EXTRA_VERSION_NAME
4318 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4325 module_init(lttng_events_init
);
4327 static void __exit
lttng_events_exit(void)
4329 struct lttng_session
*session
, *tmpsession
;
4331 lttng_exit_cpu_hotplug();
4332 lttng_logger_exit();
4334 list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
4335 lttng_session_destroy(session
);
4336 kmem_cache_destroy(event_cache
);
4337 kmem_cache_destroy(event_notifier_cache
);
4338 lttng_tracepoint_exit();
4339 lttng_context_exit();
4340 printk(KERN_NOTICE
"LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4341 __stringify(LTTNG_MODULES_MAJOR_VERSION
),
4342 __stringify(LTTNG_MODULES_MINOR_VERSION
),
4343 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
),
4344 LTTNG_MODULES_EXTRAVERSION
,
4346 #ifdef LTTNG_EXTRA_VERSION_GIT
4347 LTTNG_EXTRA_VERSION_GIT
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT
,
4351 #ifdef LTTNG_EXTRA_VERSION_NAME
4352 LTTNG_EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME
);
4358 module_exit(lttng_events_exit
);
4360 #include <generated/patches.h>
4361 #ifdef LTTNG_EXTRA_VERSION_GIT
4362 MODULE_INFO(extra_version_git
, LTTNG_EXTRA_VERSION_GIT
);
4364 #ifdef LTTNG_EXTRA_VERSION_NAME
4365 MODULE_INFO(extra_version_name
, LTTNG_EXTRA_VERSION_NAME
);
4367 MODULE_LICENSE("GPL and additional rights");
4368 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4369 MODULE_DESCRIPTION("LTTng tracer");
4370 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
4371 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
4372 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
4373 LTTNG_MODULES_EXTRAVERSION
);