1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Mimic system calls for:
10 * - session creation, returns a file descriptor or failure.
11 * - channel creation, returns a file descriptor or failure.
12 * - Operates on a session file descriptor
13 * - Takes all channel options as parameters.
14 * - stream get, returns a file descriptor or failure.
15 * - Operates on a channel file descriptor.
16 * - stream notifier get, returns a file descriptor or failure.
17 * - Operates on a channel file descriptor.
18 * - event creation, returns a file descriptor or failure.
19 * - Operates on a channel file descriptor
20 * - Takes an event name as parameter
21 * - Takes an instrumentation source as parameter
22 * - e.g. tracepoints, dynamic_probes...
23 * - Takes instrumentation source specific arguments.
26 #include <linux/module.h>
27 #include <linux/proc_fs.h>
28 #include <linux/anon_inodes.h>
29 #include <linux/file.h>
30 #include <linux/uaccess.h>
31 #include <linux/slab.h>
32 #include <linux/err.h>
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
34 #include <wrapper/ringbuffer/vfs.h>
35 #include <wrapper/ringbuffer/backend.h>
36 #include <wrapper/ringbuffer/frontend.h>
37 #include <wrapper/poll.h>
38 #include <wrapper/file.h>
39 #include <wrapper/kref.h>
40 #include <lttng-string-utils.h>
41 #include <lttng-abi.h>
42 #include <lttng-abi-old.h>
43 #include <lttng-events.h>
44 #include <lttng-tracer.h>
45 #include <lttng-tp-mempool.h>
46 #include <lib/ringbuffer/frontend_types.h>
47 #include <lib/ringbuffer/iterator.h>
50 * This is LTTng's own personal way to create a system call as an external
51 * module. We use ioctl() on /proc/lttng.
54 static struct proc_dir_entry
*lttng_proc_dentry
;
56 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
57 static const struct proc_ops lttng_proc_ops
;
59 static const struct file_operations lttng_proc_ops
;
62 static const struct file_operations lttng_session_fops
;
63 static const struct file_operations lttng_trigger_group_fops
;
64 static const struct file_operations lttng_channel_fops
;
65 static const struct file_operations lttng_metadata_fops
;
66 static const struct file_operations lttng_event_fops
;
67 static struct file_operations lttng_stream_ring_buffer_file_operations
;
69 static int put_u64(uint64_t val
, unsigned long arg
);
72 * Teardown management: opened file descriptors keep a refcount on the module,
73 * so it can only exit when all file descriptors are closed.
77 int lttng_abi_create_session(void)
79 struct lttng_session
*session
;
80 struct file
*session_file
;
83 session
= lttng_session_create();
86 session_fd
= lttng_get_unused_fd();
91 session_file
= anon_inode_getfile("[lttng_session]",
94 if (IS_ERR(session_file
)) {
95 ret
= PTR_ERR(session_file
);
98 session
->file
= session_file
;
99 fd_install(session_fd
, session_file
);
103 put_unused_fd(session_fd
);
105 lttng_session_destroy(session
);
110 void trigger_send_notification_work_wakeup(struct irq_work
*entry
)
112 struct lttng_trigger_group
*trigger_group
= container_of(entry
,
113 struct lttng_trigger_group
, wakeup_pending
);
114 wake_up_interruptible(&trigger_group
->read_wait
);
118 int lttng_abi_create_trigger_group(void)
120 struct lttng_trigger_group
*trigger_group
;
121 struct file
*trigger_group_file
;
122 int trigger_group_fd
, ret
;
124 trigger_group
= lttng_trigger_group_create();
128 trigger_group_fd
= lttng_get_unused_fd();
129 if (trigger_group_fd
< 0) {
130 ret
= trigger_group_fd
;
133 trigger_group_file
= anon_inode_getfile("[lttng_trigger_group]",
134 <tng_trigger_group_fops
,
135 trigger_group
, O_RDWR
);
136 if (IS_ERR(trigger_group_file
)) {
137 ret
= PTR_ERR(trigger_group_file
);
141 trigger_group
->file
= trigger_group_file
;
142 init_waitqueue_head(&trigger_group
->read_wait
);
143 init_irq_work(&trigger_group
->wakeup_pending
,
144 trigger_send_notification_work_wakeup
);
145 fd_install(trigger_group_fd
, trigger_group_file
);
146 return trigger_group_fd
;
149 put_unused_fd(trigger_group_fd
);
151 lttng_trigger_group_destroy(trigger_group
);
156 int lttng_abi_tracepoint_list(void)
158 struct file
*tracepoint_list_file
;
161 file_fd
= lttng_get_unused_fd();
167 tracepoint_list_file
= anon_inode_getfile("[lttng_tracepoint_list]",
168 <tng_tracepoint_list_fops
,
170 if (IS_ERR(tracepoint_list_file
)) {
171 ret
= PTR_ERR(tracepoint_list_file
);
174 ret
= lttng_tracepoint_list_fops
.open(NULL
, tracepoint_list_file
);
177 fd_install(file_fd
, tracepoint_list_file
);
181 fput(tracepoint_list_file
);
183 put_unused_fd(file_fd
);
188 #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
190 int lttng_abi_syscall_list(void)
196 int lttng_abi_syscall_list(void)
198 struct file
*syscall_list_file
;
201 file_fd
= lttng_get_unused_fd();
207 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
208 <tng_syscall_list_fops
,
210 if (IS_ERR(syscall_list_file
)) {
211 ret
= PTR_ERR(syscall_list_file
);
214 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
217 fd_install(file_fd
, syscall_list_file
);
221 fput(syscall_list_file
);
223 put_unused_fd(file_fd
);
230 void lttng_abi_tracer_version(struct lttng_kernel_tracer_version
*v
)
232 v
->major
= LTTNG_MODULES_MAJOR_VERSION
;
233 v
->minor
= LTTNG_MODULES_MINOR_VERSION
;
234 v
->patchlevel
= LTTNG_MODULES_PATCHLEVEL_VERSION
;
238 void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version
*v
)
240 v
->major
= LTTNG_MODULES_ABI_MAJOR_VERSION
;
241 v
->minor
= LTTNG_MODULES_ABI_MINOR_VERSION
;
245 long lttng_abi_add_context(struct file
*file
,
246 struct lttng_kernel_context
*context_param
,
247 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
250 if (session
->been_active
)
253 switch (context_param
->ctx
) {
254 case LTTNG_KERNEL_CONTEXT_PID
:
255 return lttng_add_pid_to_ctx(ctx
);
256 case LTTNG_KERNEL_CONTEXT_PRIO
:
257 return lttng_add_prio_to_ctx(ctx
);
258 case LTTNG_KERNEL_CONTEXT_NICE
:
259 return lttng_add_nice_to_ctx(ctx
);
260 case LTTNG_KERNEL_CONTEXT_VPID
:
261 return lttng_add_vpid_to_ctx(ctx
);
262 case LTTNG_KERNEL_CONTEXT_TID
:
263 return lttng_add_tid_to_ctx(ctx
);
264 case LTTNG_KERNEL_CONTEXT_VTID
:
265 return lttng_add_vtid_to_ctx(ctx
);
266 case LTTNG_KERNEL_CONTEXT_PPID
:
267 return lttng_add_ppid_to_ctx(ctx
);
268 case LTTNG_KERNEL_CONTEXT_VPPID
:
269 return lttng_add_vppid_to_ctx(ctx
);
270 case LTTNG_KERNEL_CONTEXT_PERF_COUNTER
:
271 context_param
->u
.perf_counter
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
272 return lttng_add_perf_counter_to_ctx(context_param
->u
.perf_counter
.type
,
273 context_param
->u
.perf_counter
.config
,
274 context_param
->u
.perf_counter
.name
,
276 case LTTNG_KERNEL_CONTEXT_PROCNAME
:
277 return lttng_add_procname_to_ctx(ctx
);
278 case LTTNG_KERNEL_CONTEXT_HOSTNAME
:
279 return lttng_add_hostname_to_ctx(ctx
);
280 case LTTNG_KERNEL_CONTEXT_CPU_ID
:
281 return lttng_add_cpu_id_to_ctx(ctx
);
282 case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE
:
283 return lttng_add_interruptible_to_ctx(ctx
);
284 case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE
:
285 return lttng_add_need_reschedule_to_ctx(ctx
);
286 case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE
:
287 return lttng_add_preemptible_to_ctx(ctx
);
288 case LTTNG_KERNEL_CONTEXT_MIGRATABLE
:
289 return lttng_add_migratable_to_ctx(ctx
);
290 case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL
:
291 case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER
:
292 return lttng_add_callstack_to_ctx(ctx
, context_param
->ctx
);
293 case LTTNG_KERNEL_CONTEXT_CGROUP_NS
:
294 return lttng_add_cgroup_ns_to_ctx(ctx
);
295 case LTTNG_KERNEL_CONTEXT_IPC_NS
:
296 return lttng_add_ipc_ns_to_ctx(ctx
);
297 case LTTNG_KERNEL_CONTEXT_MNT_NS
:
298 return lttng_add_mnt_ns_to_ctx(ctx
);
299 case LTTNG_KERNEL_CONTEXT_NET_NS
:
300 return lttng_add_net_ns_to_ctx(ctx
);
301 case LTTNG_KERNEL_CONTEXT_PID_NS
:
302 return lttng_add_pid_ns_to_ctx(ctx
);
303 case LTTNG_KERNEL_CONTEXT_USER_NS
:
304 return lttng_add_user_ns_to_ctx(ctx
);
305 case LTTNG_KERNEL_CONTEXT_UTS_NS
:
306 return lttng_add_uts_ns_to_ctx(ctx
);
307 case LTTNG_KERNEL_CONTEXT_UID
:
308 return lttng_add_uid_to_ctx(ctx
);
309 case LTTNG_KERNEL_CONTEXT_EUID
:
310 return lttng_add_euid_to_ctx(ctx
);
311 case LTTNG_KERNEL_CONTEXT_SUID
:
312 return lttng_add_suid_to_ctx(ctx
);
313 case LTTNG_KERNEL_CONTEXT_GID
:
314 return lttng_add_gid_to_ctx(ctx
);
315 case LTTNG_KERNEL_CONTEXT_EGID
:
316 return lttng_add_egid_to_ctx(ctx
);
317 case LTTNG_KERNEL_CONTEXT_SGID
:
318 return lttng_add_sgid_to_ctx(ctx
);
319 case LTTNG_KERNEL_CONTEXT_VUID
:
320 return lttng_add_vuid_to_ctx(ctx
);
321 case LTTNG_KERNEL_CONTEXT_VEUID
:
322 return lttng_add_veuid_to_ctx(ctx
);
323 case LTTNG_KERNEL_CONTEXT_VSUID
:
324 return lttng_add_vsuid_to_ctx(ctx
);
325 case LTTNG_KERNEL_CONTEXT_VGID
:
326 return lttng_add_vgid_to_ctx(ctx
);
327 case LTTNG_KERNEL_CONTEXT_VEGID
:
328 return lttng_add_vegid_to_ctx(ctx
);
329 case LTTNG_KERNEL_CONTEXT_VSGID
:
330 return lttng_add_vsgid_to_ctx(ctx
);
337 * lttng_ioctl - lttng syscall through ioctl
343 * This ioctl implements lttng commands:
344 * LTTNG_KERNEL_SESSION
345 * Returns a LTTng trace session file descriptor
346 * LTTNG_KERNEL_TRACER_VERSION
347 * Returns the LTTng kernel tracer version
348 * LTTNG_KERNEL_TRACEPOINT_LIST
349 * Returns a file descriptor listing available tracepoints
350 * LTTNG_KERNEL_WAIT_QUIESCENT
351 * Returns after all previously running probes have completed
352 * LTTNG_KERNEL_TRACER_ABI_VERSION
353 * Returns the LTTng kernel tracer ABI version
354 * LTTNG_KERNEL_TRIGGER_GROUP_CREATE
355 * Returns a LTTng trigger group file descriptor
357 * The returned session will be deleted when its file descriptor is closed.
360 long lttng_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
363 case LTTNG_KERNEL_OLD_SESSION
:
364 case LTTNG_KERNEL_SESSION
:
365 return lttng_abi_create_session();
366 case LTTNG_KERNEL_TRIGGER_GROUP_CREATE
:
367 return lttng_abi_create_trigger_group();
368 case LTTNG_KERNEL_OLD_TRACER_VERSION
:
370 struct lttng_kernel_tracer_version v
;
371 struct lttng_kernel_old_tracer_version oldv
;
372 struct lttng_kernel_old_tracer_version
*uversion
=
373 (struct lttng_kernel_old_tracer_version __user
*) arg
;
375 lttng_abi_tracer_version(&v
);
376 oldv
.major
= v
.major
;
377 oldv
.minor
= v
.minor
;
378 oldv
.patchlevel
= v
.patchlevel
;
380 if (copy_to_user(uversion
, &oldv
, sizeof(oldv
)))
384 case LTTNG_KERNEL_TRACER_VERSION
:
386 struct lttng_kernel_tracer_version version
;
387 struct lttng_kernel_tracer_version
*uversion
=
388 (struct lttng_kernel_tracer_version __user
*) arg
;
390 lttng_abi_tracer_version(&version
);
392 if (copy_to_user(uversion
, &version
, sizeof(version
)))
396 case LTTNG_KERNEL_TRACER_ABI_VERSION
:
398 struct lttng_kernel_tracer_abi_version version
;
399 struct lttng_kernel_tracer_abi_version
*uversion
=
400 (struct lttng_kernel_tracer_abi_version __user
*) arg
;
402 lttng_abi_tracer_abi_version(&version
);
404 if (copy_to_user(uversion
, &version
, sizeof(version
)))
408 case LTTNG_KERNEL_OLD_TRACEPOINT_LIST
:
409 case LTTNG_KERNEL_TRACEPOINT_LIST
:
410 return lttng_abi_tracepoint_list();
411 case LTTNG_KERNEL_SYSCALL_LIST
:
412 return lttng_abi_syscall_list();
413 case LTTNG_KERNEL_OLD_WAIT_QUIESCENT
:
414 case LTTNG_KERNEL_WAIT_QUIESCENT
:
417 case LTTNG_KERNEL_OLD_CALIBRATE
:
419 struct lttng_kernel_old_calibrate __user
*ucalibrate
=
420 (struct lttng_kernel_old_calibrate __user
*) arg
;
421 struct lttng_kernel_old_calibrate old_calibrate
;
422 struct lttng_kernel_calibrate calibrate
;
425 if (copy_from_user(&old_calibrate
, ucalibrate
, sizeof(old_calibrate
)))
427 calibrate
.type
= old_calibrate
.type
;
428 ret
= lttng_calibrate(&calibrate
);
429 if (copy_to_user(ucalibrate
, &old_calibrate
, sizeof(old_calibrate
)))
433 case LTTNG_KERNEL_CALIBRATE
:
435 struct lttng_kernel_calibrate __user
*ucalibrate
=
436 (struct lttng_kernel_calibrate __user
*) arg
;
437 struct lttng_kernel_calibrate calibrate
;
440 if (copy_from_user(&calibrate
, ucalibrate
, sizeof(calibrate
)))
442 ret
= lttng_calibrate(&calibrate
);
443 if (copy_to_user(ucalibrate
, &calibrate
, sizeof(calibrate
)))
452 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
453 static const struct proc_ops lttng_proc_ops
= {
454 .proc_ioctl
= lttng_ioctl
,
456 .proc_compat_ioctl
= lttng_ioctl
,
457 #endif /* CONFIG_COMPAT */
460 static const struct file_operations lttng_proc_ops
= {
461 .owner
= THIS_MODULE
,
462 .unlocked_ioctl
= lttng_ioctl
,
464 .compat_ioctl
= lttng_ioctl
,
465 #endif /* CONFIG_COMPAT */
470 int lttng_abi_create_channel(struct file
*session_file
,
471 struct lttng_kernel_channel
*chan_param
,
472 enum channel_type channel_type
)
474 struct lttng_session
*session
= session_file
->private_data
;
475 const struct file_operations
*fops
= NULL
;
476 const char *transport_name
;
477 struct lttng_channel
*chan
;
478 struct file
*chan_file
;
482 chan_fd
= lttng_get_unused_fd();
487 switch (channel_type
) {
488 case PER_CPU_CHANNEL
:
489 fops
= <tng_channel_fops
;
491 case METADATA_CHANNEL
:
492 fops
= <tng_metadata_fops
;
496 chan_file
= anon_inode_getfile("[lttng_channel]",
499 if (IS_ERR(chan_file
)) {
500 ret
= PTR_ERR(chan_file
);
503 switch (channel_type
) {
504 case PER_CPU_CHANNEL
:
505 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
) {
506 transport_name
= chan_param
->overwrite
?
507 "relay-overwrite" : "relay-discard";
508 } else if (chan_param
->output
== LTTNG_KERNEL_MMAP
) {
509 transport_name
= chan_param
->overwrite
?
510 "relay-overwrite-mmap" : "relay-discard-mmap";
515 case METADATA_CHANNEL
:
516 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
)
517 transport_name
= "relay-metadata";
518 else if (chan_param
->output
== LTTNG_KERNEL_MMAP
)
519 transport_name
= "relay-metadata-mmap";
524 transport_name
= "<unknown>";
527 if (!atomic_long_add_unless(&session_file
->f_count
, 1, LONG_MAX
)) {
532 * We tolerate no failure path after channel creation. It will stay
533 * invariant for the rest of the session.
535 chan
= lttng_channel_create(session
, transport_name
, NULL
,
536 chan_param
->subbuf_size
,
537 chan_param
->num_subbuf
,
538 chan_param
->switch_timer_interval
,
539 chan_param
->read_timer_interval
,
545 chan
->file
= chan_file
;
546 chan_file
->private_data
= chan
;
547 fd_install(chan_fd
, chan_file
);
552 atomic_long_dec(&session_file
->f_count
);
556 put_unused_fd(chan_fd
);
562 int lttng_abi_session_set_name(struct lttng_session
*session
,
563 struct lttng_kernel_session_name
*name
)
567 len
= strnlen(name
->name
, LTTNG_KERNEL_SESSION_NAME_LEN
);
569 if (len
== LTTNG_KERNEL_SESSION_NAME_LEN
) {
570 /* Name is too long/malformed */
574 strcpy(session
->name
, name
->name
);
579 int lttng_abi_session_set_creation_time(struct lttng_session
*session
,
580 struct lttng_kernel_session_creation_time
*time
)
584 len
= strnlen(time
->iso8601
, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN
);
586 if (len
== LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN
) {
587 /* Time is too long/malformed */
591 strcpy(session
->creation_time
, time
->iso8601
);
596 enum tracker_type
get_tracker_type(struct lttng_kernel_tracker_args
*tracker
)
598 switch (tracker
->type
) {
599 case LTTNG_KERNEL_TRACKER_PID
:
601 case LTTNG_KERNEL_TRACKER_VPID
:
603 case LTTNG_KERNEL_TRACKER_UID
:
605 case LTTNG_KERNEL_TRACKER_VUID
:
607 case LTTNG_KERNEL_TRACKER_GID
:
609 case LTTNG_KERNEL_TRACKER_VGID
:
612 return TRACKER_UNKNOWN
;
617 * lttng_session_ioctl - lttng session fd ioctl
623 * This ioctl implements lttng commands:
624 * LTTNG_KERNEL_CHANNEL
625 * Returns a LTTng channel file descriptor
626 * LTTNG_KERNEL_ENABLE
627 * Enables tracing for a session (weak enable)
628 * LTTNG_KERNEL_DISABLE
629 * Disables tracing for a session (strong disable)
630 * LTTNG_KERNEL_METADATA
631 * Returns a LTTng metadata file descriptor
632 * LTTNG_KERNEL_SESSION_TRACK_PID
633 * Add PID to session PID tracker
634 * LTTNG_KERNEL_SESSION_UNTRACK_PID
635 * Remove PID from session PID tracker
636 * LTTNG_KERNEL_SESSION_TRACK_ID
638 * LTTNG_KERNEL_SESSION_UNTRACK_ID
639 * Remove ID from tracker
641 * The returned channel will be deleted when its file descriptor is closed.
644 long lttng_session_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
646 struct lttng_session
*session
= file
->private_data
;
647 struct lttng_kernel_channel chan_param
;
648 struct lttng_kernel_old_channel old_chan_param
;
651 case LTTNG_KERNEL_OLD_CHANNEL
:
653 if (copy_from_user(&old_chan_param
,
654 (struct lttng_kernel_old_channel __user
*) arg
,
655 sizeof(struct lttng_kernel_old_channel
)))
657 chan_param
.overwrite
= old_chan_param
.overwrite
;
658 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
659 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
660 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
661 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
662 chan_param
.output
= old_chan_param
.output
;
664 return lttng_abi_create_channel(file
, &chan_param
,
667 case LTTNG_KERNEL_CHANNEL
:
669 if (copy_from_user(&chan_param
,
670 (struct lttng_kernel_channel __user
*) arg
,
671 sizeof(struct lttng_kernel_channel
)))
673 return lttng_abi_create_channel(file
, &chan_param
,
676 case LTTNG_KERNEL_OLD_SESSION_START
:
677 case LTTNG_KERNEL_OLD_ENABLE
:
678 case LTTNG_KERNEL_SESSION_START
:
679 case LTTNG_KERNEL_ENABLE
:
680 return lttng_session_enable(session
);
681 case LTTNG_KERNEL_OLD_SESSION_STOP
:
682 case LTTNG_KERNEL_OLD_DISABLE
:
683 case LTTNG_KERNEL_SESSION_STOP
:
684 case LTTNG_KERNEL_DISABLE
:
685 return lttng_session_disable(session
);
686 case LTTNG_KERNEL_OLD_METADATA
:
688 if (copy_from_user(&old_chan_param
,
689 (struct lttng_kernel_old_channel __user
*) arg
,
690 sizeof(struct lttng_kernel_old_channel
)))
692 chan_param
.overwrite
= old_chan_param
.overwrite
;
693 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
694 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
695 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
696 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
697 chan_param
.output
= old_chan_param
.output
;
699 return lttng_abi_create_channel(file
, &chan_param
,
702 case LTTNG_KERNEL_METADATA
:
704 if (copy_from_user(&chan_param
,
705 (struct lttng_kernel_channel __user
*) arg
,
706 sizeof(struct lttng_kernel_channel
)))
708 return lttng_abi_create_channel(file
, &chan_param
,
711 case LTTNG_KERNEL_SESSION_TRACK_PID
:
712 return lttng_session_track_id(session
, TRACKER_PID
, (int) arg
);
713 case LTTNG_KERNEL_SESSION_UNTRACK_PID
:
714 return lttng_session_untrack_id(session
, TRACKER_PID
, (int) arg
);
715 case LTTNG_KERNEL_SESSION_TRACK_ID
:
717 struct lttng_kernel_tracker_args tracker
;
718 enum tracker_type tracker_type
;
720 if (copy_from_user(&tracker
,
721 (struct lttng_kernel_tracker_args __user
*) arg
,
722 sizeof(struct lttng_kernel_tracker_args
)))
724 tracker_type
= get_tracker_type(&tracker
);
725 if (tracker_type
== TRACKER_UNKNOWN
)
727 return lttng_session_track_id(session
, tracker_type
, tracker
.id
);
729 case LTTNG_KERNEL_SESSION_UNTRACK_ID
:
731 struct lttng_kernel_tracker_args tracker
;
732 enum tracker_type tracker_type
;
734 if (copy_from_user(&tracker
,
735 (struct lttng_kernel_tracker_args __user
*) arg
,
736 sizeof(struct lttng_kernel_tracker_args
)))
738 tracker_type
= get_tracker_type(&tracker
);
739 if (tracker_type
== TRACKER_UNKNOWN
)
741 return lttng_session_untrack_id(session
, tracker_type
,
744 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
:
745 return lttng_session_list_tracker_ids(session
, TRACKER_PID
);
746 case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS
:
748 struct lttng_kernel_tracker_args tracker
;
749 enum tracker_type tracker_type
;
751 if (copy_from_user(&tracker
,
752 (struct lttng_kernel_tracker_args __user
*) arg
,
753 sizeof(struct lttng_kernel_tracker_args
)))
755 tracker_type
= get_tracker_type(&tracker
);
756 if (tracker_type
== TRACKER_UNKNOWN
)
758 return lttng_session_list_tracker_ids(session
, tracker_type
);
760 case LTTNG_KERNEL_SESSION_METADATA_REGEN
:
761 return lttng_session_metadata_regenerate(session
);
762 case LTTNG_KERNEL_SESSION_STATEDUMP
:
763 return lttng_session_statedump(session
);
764 case LTTNG_KERNEL_SESSION_SET_NAME
:
766 struct lttng_kernel_session_name name
;
768 if (copy_from_user(&name
,
769 (struct lttng_kernel_session_name __user
*) arg
,
770 sizeof(struct lttng_kernel_session_name
)))
772 return lttng_abi_session_set_name(session
, &name
);
774 case LTTNG_KERNEL_SESSION_SET_CREATION_TIME
:
776 struct lttng_kernel_session_creation_time time
;
778 if (copy_from_user(&time
,
779 (struct lttng_kernel_session_creation_time __user
*) arg
,
780 sizeof(struct lttng_kernel_session_creation_time
)))
782 return lttng_abi_session_set_creation_time(session
, &time
);
790 * Called when the last file reference is dropped.
792 * Big fat note: channels and events are invariant for the whole session after
793 * their creation. So this session destruction also destroys all channel and
794 * event structures specific to this session (they are not destroyed when their
795 * individual file is released).
798 int lttng_session_release(struct inode
*inode
, struct file
*file
)
800 struct lttng_session
*session
= file
->private_data
;
803 lttng_session_destroy(session
);
807 static const struct file_operations lttng_session_fops
= {
808 .owner
= THIS_MODULE
,
809 .release
= lttng_session_release
,
810 .unlocked_ioctl
= lttng_session_ioctl
,
812 .compat_ioctl
= lttng_session_ioctl
,
817 * When encountering empty buffer, flush current sub-buffer if non-empty
818 * and retry (if new data available to read after flush).
821 ssize_t
lttng_trigger_group_notif_read(struct file
*filp
, char __user
*user_buf
,
822 size_t count
, loff_t
*ppos
)
824 struct lttng_trigger_group
*trigger_group
= filp
->private_data
;
825 struct channel
*chan
= trigger_group
->chan
;
826 struct lib_ring_buffer
*buf
= trigger_group
->buf
;
827 ssize_t read_count
= 0, len
;
831 if (!lttng_access_ok(VERIFY_WRITE
, user_buf
, count
))
834 /* Finish copy of previous record */
836 if (read_count
< count
) {
837 len
= chan
->iter
.len_left
;
843 while (read_count
< count
) {
844 size_t copy_len
, space_left
;
846 len
= lib_ring_buffer_get_next_record(chan
, buf
);
850 * Check if buffer is finalized (end of file).
852 if (len
== -ENODATA
) {
853 /* A 0 read_count will tell about end of file */
856 if (filp
->f_flags
& O_NONBLOCK
) {
858 read_count
= -EAGAIN
;
864 * No data available at the moment, return what
871 * Wait for returned len to be >= 0 or -ENODATA.
873 error
= wait_event_interruptible(
874 trigger_group
->read_wait
,
875 ((len
= lib_ring_buffer_get_next_record(
876 chan
, buf
)), len
!= -EAGAIN
));
877 CHAN_WARN_ON(chan
, len
== -EBUSY
);
882 CHAN_WARN_ON(chan
, len
< 0 && len
!= -ENODATA
);
886 read_offset
= buf
->iter
.read_offset
;
888 space_left
= count
- read_count
;
889 if (len
<= space_left
) {
891 chan
->iter
.len_left
= 0;
894 copy_len
= space_left
;
895 chan
->iter
.len_left
= len
- copy_len
;
896 *ppos
= read_offset
+ copy_len
;
898 if (__lib_ring_buffer_copy_to_user(&buf
->backend
, read_offset
,
899 &user_buf
[read_count
],
902 * Leave the len_left and ppos values at their current
903 * state, as we currently have a valid event to read.
907 read_count
+= copy_len
;
913 chan
->iter
.len_left
= 0;
916 lib_ring_buffer_put_current_record(buf
);
921 * If the ring buffer is non empty (even just a partial subbuffer), return that
922 * there is data available. Perform a ring buffer flush if we encounter a
923 * non-empty ring buffer which does not have any consumeable subbuffer available.
926 unsigned int lttng_trigger_group_notif_poll(struct file
*filp
,
929 unsigned int mask
= 0;
930 struct lttng_trigger_group
*trigger_group
= filp
->private_data
;
931 struct channel
*chan
= trigger_group
->chan
;
932 struct lib_ring_buffer
*buf
= trigger_group
->buf
;
933 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
934 int finalized
, disabled
;
935 unsigned long consumed
, offset
;
936 size_t subbuffer_header_size
= config
->cb
.subbuffer_header_size();
938 if (filp
->f_mode
& FMODE_READ
) {
939 poll_wait_set_exclusive(wait
);
940 poll_wait(filp
, &trigger_group
->read_wait
, wait
);
942 finalized
= lib_ring_buffer_is_finalized(config
, buf
);
943 disabled
= lib_ring_buffer_channel_is_disabled(chan
);
946 * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering
947 * finalized load before offsets loads.
949 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
954 offset
= lib_ring_buffer_get_offset(config
, buf
);
955 consumed
= lib_ring_buffer_get_consumed(config
, buf
);
958 * If there is no buffer available to consume.
960 if (subbuf_trunc(offset
, chan
) - subbuf_trunc(consumed
, chan
) == 0) {
962 * If there is a non-empty subbuffer, flush and try again.
964 if (subbuf_offset(offset
, chan
) > subbuffer_header_size
) {
965 lib_ring_buffer_switch_remote(buf
);
973 * The memory barriers
974 * __wait_event()/wake_up_interruptible() take
975 * care of "raw_spin_is_locked" memory ordering.
977 if (raw_spin_is_locked(&buf
->raw_tick_nohz_spinlock
))
983 if (subbuf_trunc(offset
, chan
) - subbuf_trunc(consumed
, chan
)
984 >= chan
->backend
.buf_size
)
985 return POLLPRI
| POLLRDBAND
;
987 return POLLIN
| POLLRDNORM
;
995 * lttng_trigger_group_notif_open - trigger ring buffer open file operation
996 * @inode: opened inode
999 * Open implementation. Makes sure only one open instance of a buffer is
1000 * done at a given moment.
1002 static int lttng_trigger_group_notif_open(struct inode
*inode
, struct file
*file
)
1004 struct lttng_trigger_group
*trigger_group
= inode
->i_private
;
1005 struct lib_ring_buffer
*buf
= trigger_group
->buf
;
1007 file
->private_data
= trigger_group
;
1008 return lib_ring_buffer_open(inode
, file
, buf
);
1012 * lttng_trigger_group_notif_release - trigger ring buffer release file operation
1013 * @inode: opened inode
1014 * @file: opened file
1016 * Release implementation.
1018 static int lttng_trigger_group_notif_release(struct inode
*inode
, struct file
*file
)
1020 struct lttng_trigger_group
*trigger_group
= file
->private_data
;
1021 struct lib_ring_buffer
*buf
= trigger_group
->buf
;
1024 ret
= lib_ring_buffer_release(inode
, file
, buf
);
1027 fput(trigger_group
->file
);
1031 static const struct file_operations lttng_trigger_group_notif_fops
= {
1032 .owner
= THIS_MODULE
,
1033 .open
= lttng_trigger_group_notif_open
,
1034 .release
= lttng_trigger_group_notif_release
,
1035 .read
= lttng_trigger_group_notif_read
,
1036 .poll
= lttng_trigger_group_notif_poll
,
1040 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
1044 * Handles the poll operations for the metadata channels.
1047 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
1050 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1051 struct lib_ring_buffer
*buf
= stream
->priv
;
1053 unsigned int mask
= 0;
1055 if (filp
->f_mode
& FMODE_READ
) {
1056 poll_wait_set_exclusive(wait
);
1057 poll_wait(filp
, &stream
->read_wait
, wait
);
1059 finalized
= stream
->finalized
;
1062 * lib_ring_buffer_is_finalized() contains a smp_rmb()
1063 * ordering finalized load before offsets loads.
1065 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
1070 mutex_lock(&stream
->metadata_cache
->lock
);
1071 if (stream
->metadata_cache
->metadata_written
>
1072 stream
->metadata_out
)
1074 mutex_unlock(&stream
->metadata_cache
->lock
);
1081 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
1082 unsigned int cmd
, unsigned long arg
)
1084 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1086 stream
->metadata_out
= stream
->metadata_in
;
1090 * Reset the counter of how much metadata has been consumed to 0. That way,
1091 * the consumer receives the content of the metadata cache unchanged. This is
1092 * different from the metadata_regenerate where the offset from epoch is
1093 * resampled, here we want the exact same content as the last time the metadata
1094 * was generated. This command is only possible if all the metadata written
1095 * in the cache has been output to the metadata stream to avoid corrupting the
1098 * Return 0 on success, a negative value on error.
1101 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
1104 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
1106 mutex_lock(&cache
->lock
);
1107 if (stream
->metadata_out
!= cache
->metadata_written
) {
1111 stream
->metadata_out
= 0;
1112 stream
->metadata_in
= 0;
1113 wake_up_interruptible(&stream
->read_wait
);
1117 mutex_unlock(&cache
->lock
);
1122 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
1123 unsigned int cmd
, unsigned long arg
)
1126 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1127 struct lib_ring_buffer
*buf
= stream
->priv
;
1130 case RING_BUFFER_GET_NEXT_SUBBUF
:
1132 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1133 struct lib_ring_buffer
*buf
= stream
->priv
;
1134 struct channel
*chan
= buf
->backend
.chan
;
1136 ret
= lttng_metadata_output_channel(stream
, chan
);
1138 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
1144 case RING_BUFFER_GET_SUBBUF
:
1147 * Random access is not allowed for metadata channel.
1151 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
1152 case RING_BUFFER_FLUSH
:
1154 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1155 struct lib_ring_buffer
*buf
= stream
->priv
;
1156 struct channel
*chan
= buf
->backend
.chan
;
1159 * Before doing the actual ring buffer flush, write up to one
1160 * packet of metadata in the ring buffer.
1162 ret
= lttng_metadata_output_channel(stream
, chan
);
1167 case RING_BUFFER_GET_METADATA_VERSION
:
1169 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1171 return put_u64(stream
->version
, arg
);
1173 case RING_BUFFER_METADATA_CACHE_DUMP
:
1175 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1177 return lttng_metadata_cache_dump(stream
);
1182 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1184 /* Performing lib ring buffer ioctl after our own. */
1185 ret
= lib_ring_buffer_ioctl(filp
, cmd
, arg
, buf
);
1190 case RING_BUFFER_PUT_NEXT_SUBBUF
:
1192 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
1203 #ifdef CONFIG_COMPAT
1205 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
1206 unsigned int cmd
, unsigned long arg
)
1209 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1210 struct lib_ring_buffer
*buf
= stream
->priv
;
1213 case RING_BUFFER_GET_NEXT_SUBBUF
:
1215 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1216 struct lib_ring_buffer
*buf
= stream
->priv
;
1217 struct channel
*chan
= buf
->backend
.chan
;
1219 ret
= lttng_metadata_output_channel(stream
, chan
);
1221 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
1227 case RING_BUFFER_GET_SUBBUF
:
1230 * Random access is not allowed for metadata channel.
1234 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
1235 case RING_BUFFER_FLUSH
:
1237 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1238 struct lib_ring_buffer
*buf
= stream
->priv
;
1239 struct channel
*chan
= buf
->backend
.chan
;
1242 * Before doing the actual ring buffer flush, write up to one
1243 * packet of metadata in the ring buffer.
1245 ret
= lttng_metadata_output_channel(stream
, chan
);
1250 case RING_BUFFER_GET_METADATA_VERSION
:
1252 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1254 return put_u64(stream
->version
, arg
);
1256 case RING_BUFFER_METADATA_CACHE_DUMP
:
1258 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1260 return lttng_metadata_cache_dump(stream
);
1265 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1267 /* Performing lib ring buffer ioctl after our own. */
1268 ret
= lib_ring_buffer_compat_ioctl(filp
, cmd
, arg
, buf
);
1273 case RING_BUFFER_PUT_NEXT_SUBBUF
:
1275 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
1288 * This is not used by anonymous file descriptors. This code is left
1289 * there if we ever want to implement an inode with open() operation.
1292 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
1294 struct lttng_metadata_stream
*stream
= inode
->i_private
;
1295 struct lib_ring_buffer
*buf
= stream
->priv
;
1297 file
->private_data
= buf
;
1299 * Since life-time of metadata cache differs from that of
1300 * session, we need to keep our own reference on the transport.
1302 if (!try_module_get(stream
->transport
->owner
)) {
1303 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1306 return lib_ring_buffer_open(inode
, file
, buf
);
1310 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
1312 struct lttng_metadata_stream
*stream
= file
->private_data
;
1313 struct lib_ring_buffer
*buf
= stream
->priv
;
1315 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
1316 module_put(stream
->transport
->owner
);
1317 return lib_ring_buffer_release(inode
, file
, buf
);
1321 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
1322 struct pipe_inode_info
*pipe
, size_t len
,
1325 struct lttng_metadata_stream
*stream
= in
->private_data
;
1326 struct lib_ring_buffer
*buf
= stream
->priv
;
1328 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
1333 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
1334 struct vm_area_struct
*vma
)
1336 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1337 struct lib_ring_buffer
*buf
= stream
->priv
;
1339 return lib_ring_buffer_mmap(filp
, vma
, buf
);
1343 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
1344 .owner
= THIS_MODULE
,
1345 .open
= lttng_metadata_ring_buffer_open
,
1346 .release
= lttng_metadata_ring_buffer_release
,
1347 .poll
= lttng_metadata_ring_buffer_poll
,
1348 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
1349 .mmap
= lttng_metadata_ring_buffer_mmap
,
1350 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
1351 .llseek
= vfs_lib_ring_buffer_no_llseek
,
1352 #ifdef CONFIG_COMPAT
1353 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
1358 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
1359 const struct file_operations
*fops
, const char *name
)
1362 struct file
*stream_file
;
1364 stream_fd
= lttng_get_unused_fd();
1365 if (stream_fd
< 0) {
1369 stream_file
= anon_inode_getfile(name
, fops
, stream_priv
, O_RDWR
);
1370 if (IS_ERR(stream_file
)) {
1371 ret
= PTR_ERR(stream_file
);
1375 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1376 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1377 * file descriptor, so we set FMODE_PREAD here.
1379 stream_file
->f_mode
|= FMODE_PREAD
;
1380 fd_install(stream_fd
, stream_file
);
1382 * The stream holds a reference to the channel within the generic ring
1383 * buffer library, so no need to hold a refcount on the channel and
1384 * session files here.
1389 put_unused_fd(stream_fd
);
1395 int lttng_abi_open_stream(struct file
*channel_file
)
1397 struct lttng_channel
*channel
= channel_file
->private_data
;
1398 struct lib_ring_buffer
*buf
;
1402 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1407 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1408 <tng_stream_ring_buffer_file_operations
,
1416 channel
->ops
->buffer_read_close(buf
);
1421 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
1423 struct lttng_channel
*channel
= channel_file
->private_data
;
1424 struct lttng_session
*session
= channel
->session
;
1425 struct lib_ring_buffer
*buf
;
1427 struct lttng_metadata_stream
*metadata_stream
;
1430 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1434 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1436 if (!metadata_stream
) {
1440 metadata_stream
->metadata_cache
= session
->metadata_cache
;
1441 init_waitqueue_head(&metadata_stream
->read_wait
);
1442 metadata_stream
->priv
= buf
;
1443 stream_priv
= metadata_stream
;
1444 metadata_stream
->transport
= channel
->transport
;
1447 * Since life-time of metadata cache differs from that of
1448 * session, we need to keep our own reference on the transport.
1450 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1451 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1456 if (!lttng_kref_get(&session
->metadata_cache
->refcount
)) {
1461 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1462 <tng_metadata_ring_buffer_file_operations
,
1463 "[lttng_metadata_stream]");
1467 list_add(&metadata_stream
->list
,
1468 &session
->metadata_cache
->metadata_stream
);
1472 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
1474 module_put(metadata_stream
->transport
->owner
);
1476 kfree(metadata_stream
);
1478 channel
->ops
->buffer_read_close(buf
);
1483 int lttng_abi_open_trigger_group_stream(struct file
*notif_file
)
1485 struct lttng_trigger_group
*trigger_group
= notif_file
->private_data
;
1486 struct channel
*chan
= trigger_group
->chan
;
1487 struct lib_ring_buffer
*buf
;
1491 buf
= trigger_group
->ops
->buffer_read_open(chan
);
1495 /* The trigger notification fd holds a reference on the trigger group */
1496 if (!atomic_long_add_unless(¬if_file
->f_count
, 1, LONG_MAX
)) {
1498 goto refcount_error
;
1500 trigger_group
->buf
= buf
;
1501 stream_priv
= trigger_group
;
1502 ret
= lttng_abi_create_stream_fd(notif_file
, stream_priv
,
1503 <tng_trigger_group_notif_fops
,
1504 "[lttng_trigger_stream]");
1511 atomic_long_dec(¬if_file
->f_count
);
1513 trigger_group
->ops
->buffer_read_close(buf
);
1518 int lttng_abi_create_event(struct file
*channel_file
,
1519 struct lttng_kernel_event
*event_param
)
1521 struct lttng_channel
*channel
= channel_file
->private_data
;
1523 struct file
*event_file
;
1526 event_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1527 switch (event_param
->instrumentation
) {
1528 case LTTNG_KERNEL_KRETPROBE
:
1529 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1531 case LTTNG_KERNEL_KPROBE
:
1532 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1534 case LTTNG_KERNEL_FUNCTION
:
1535 event_param
->u
.ftrace
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1540 event_fd
= lttng_get_unused_fd();
1545 event_file
= anon_inode_getfile("[lttng_event]",
1548 if (IS_ERR(event_file
)) {
1549 ret
= PTR_ERR(event_file
);
1552 /* The event holds a reference on the channel */
1553 if (!atomic_long_add_unless(&channel_file
->f_count
, 1, LONG_MAX
)) {
1555 goto refcount_error
;
1557 if (event_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1558 || event_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1559 struct lttng_event_enabler
*event_enabler
;
1561 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1563 * If the event name is a star globbing pattern,
1564 * we create the special star globbing enabler.
1566 event_enabler
= lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB
,
1567 event_param
, channel
);
1569 event_enabler
= lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME
,
1570 event_param
, channel
);
1572 priv
= event_enabler
;
1574 struct lttng_event
*event
;
1577 * We tolerate no failure path after event creation. It
1578 * will stay invariant for the rest of the session.
1580 event
= lttng_event_create(channel
, event_param
,
1582 event_param
->instrumentation
);
1583 WARN_ON_ONCE(!event
);
1584 if (IS_ERR(event
)) {
1585 ret
= PTR_ERR(event
);
1590 event_file
->private_data
= priv
;
1591 fd_install(event_fd
, event_file
);
1595 atomic_long_dec(&channel_file
->f_count
);
1599 put_unused_fd(event_fd
);
1605 long lttng_trigger_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1607 struct lttng_trigger
*trigger
;
1608 struct lttng_trigger_enabler
*trigger_enabler
;
1609 enum lttng_event_type
*evtype
= file
->private_data
;
1612 case LTTNG_KERNEL_ENABLE
:
1614 case LTTNG_TYPE_EVENT
:
1615 trigger
= file
->private_data
;
1616 return lttng_trigger_enable(trigger
);
1617 case LTTNG_TYPE_ENABLER
:
1618 trigger_enabler
= file
->private_data
;
1619 return lttng_trigger_enabler_enable(trigger_enabler
);
1624 case LTTNG_KERNEL_DISABLE
:
1626 case LTTNG_TYPE_EVENT
:
1627 trigger
= file
->private_data
;
1628 return lttng_trigger_disable(trigger
);
1629 case LTTNG_TYPE_ENABLER
:
1630 trigger_enabler
= file
->private_data
;
1631 return lttng_trigger_enabler_disable(trigger_enabler
);
1636 case LTTNG_KERNEL_FILTER
:
1638 case LTTNG_TYPE_EVENT
:
1640 case LTTNG_TYPE_ENABLER
:
1641 trigger_enabler
= file
->private_data
;
1642 return lttng_trigger_enabler_attach_bytecode(trigger_enabler
,
1643 (struct lttng_kernel_filter_bytecode __user
*) arg
);
1648 case LTTNG_KERNEL_ADD_CALLSITE
:
1650 case LTTNG_TYPE_EVENT
:
1651 trigger
= file
->private_data
;
1652 return lttng_trigger_add_callsite(trigger
,
1653 (struct lttng_kernel_event_callsite __user
*) arg
);
1654 case LTTNG_TYPE_ENABLER
:
1661 return -ENOIOCTLCMD
;
1666 int lttng_trigger_release(struct inode
*inode
, struct file
*file
)
1668 struct lttng_trigger
*trigger
;
1669 struct lttng_trigger_enabler
*trigger_enabler
;
1670 enum lttng_event_type
*evtype
= file
->private_data
;
1676 case LTTNG_TYPE_EVENT
:
1677 trigger
= file
->private_data
;
1679 fput(trigger
->group
->file
);
1681 case LTTNG_TYPE_ENABLER
:
1682 trigger_enabler
= file
->private_data
;
1683 if (trigger_enabler
)
1684 fput(trigger_enabler
->group
->file
);
1694 static const struct file_operations lttng_trigger_fops
= {
1695 .owner
= THIS_MODULE
,
1696 .release
= lttng_trigger_release
,
1697 .unlocked_ioctl
= lttng_trigger_ioctl
,
1698 #ifdef CONFIG_COMPAT
1699 .compat_ioctl
= lttng_trigger_ioctl
,
1704 int lttng_abi_create_trigger(struct file
*trigger_group_file
,
1705 struct lttng_kernel_trigger
*trigger_param
)
1707 struct lttng_trigger_group
*trigger_group
= trigger_group_file
->private_data
;
1708 int trigger_fd
, ret
;
1709 struct file
*trigger_file
;
1712 switch (trigger_param
->instrumentation
) {
1713 case LTTNG_KERNEL_TRACEPOINT
:
1714 case LTTNG_KERNEL_UPROBE
:
1716 case LTTNG_KERNEL_KPROBE
:
1717 trigger_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1719 case LTTNG_KERNEL_SYSCALL
:
1721 case LTTNG_KERNEL_KRETPROBE
:
1722 /* Placing a trigger on kretprobe is not supported. */
1723 case LTTNG_KERNEL_FUNCTION
:
1724 case LTTNG_KERNEL_NOOP
:
1730 trigger_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1732 trigger_fd
= lttng_get_unused_fd();
1733 if (trigger_fd
< 0) {
1738 trigger_file
= anon_inode_getfile("[lttng_trigger]",
1739 <tng_trigger_fops
,
1741 if (IS_ERR(trigger_file
)) {
1742 ret
= PTR_ERR(trigger_file
);
1746 /* The trigger holds a reference on the trigger group. */
1747 if (!atomic_long_add_unless(&trigger_group_file
->f_count
, 1, LONG_MAX
)) {
1749 goto refcount_error
;
1752 if (trigger_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1753 || trigger_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1754 struct lttng_trigger_enabler
*enabler
;
1756 if (strutils_is_star_glob_pattern(trigger_param
->name
)) {
1758 * If the event name is a star globbing pattern,
1759 * we create the special star globbing enabler.
1761 enabler
= lttng_trigger_enabler_create(trigger_group
,
1762 LTTNG_ENABLER_FORMAT_STAR_GLOB
, trigger_param
);
1764 enabler
= lttng_trigger_enabler_create(trigger_group
,
1765 LTTNG_ENABLER_FORMAT_NAME
, trigger_param
);
1769 struct lttng_trigger
*trigger
;
1772 * We tolerate no failure path after trigger creation. It
1773 * will stay invariant for the rest of the session.
1775 trigger
= lttng_trigger_create(NULL
, trigger_param
->id
,
1776 trigger_group
, trigger_param
, NULL
,
1777 trigger_param
->instrumentation
);
1778 WARN_ON_ONCE(!trigger
);
1779 if (IS_ERR(trigger
)) {
1780 ret
= PTR_ERR(trigger
);
1785 trigger_file
->private_data
= priv
;
1786 fd_install(trigger_fd
, trigger_file
);
1790 atomic_long_dec(&trigger_group_file
->f_count
);
1794 put_unused_fd(trigger_fd
);
1801 long lttng_trigger_group_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1804 case LTTNG_KERNEL_TRIGGER_GROUP_NOTIFICATION_FD
:
1806 return lttng_abi_open_trigger_group_stream(file
);
1808 case LTTNG_KERNEL_TRIGGER_CREATE
:
1810 struct lttng_kernel_trigger utrigger_param
;
1812 if (copy_from_user(&utrigger_param
,
1813 (struct lttng_kernel_trigger __user
*) arg
,
1814 sizeof(utrigger_param
)))
1816 return lttng_abi_create_trigger(file
, &utrigger_param
);
1819 return -ENOIOCTLCMD
;
1825 int lttng_trigger_group_release(struct inode
*inode
, struct file
*file
)
1827 struct lttng_trigger_group
*trigger_group
= file
->private_data
;
1830 lttng_trigger_group_destroy(trigger_group
);
1834 static const struct file_operations lttng_trigger_group_fops
= {
1835 .owner
= THIS_MODULE
,
1836 .release
= lttng_trigger_group_release
,
1837 .unlocked_ioctl
= lttng_trigger_group_ioctl
,
1838 #ifdef CONFIG_COMPAT
1839 .compat_ioctl
= lttng_trigger_group_ioctl
,
1844 * lttng_channel_ioctl - lttng syscall through ioctl
1850 * This ioctl implements lttng commands:
1851 * LTTNG_KERNEL_STREAM
1852 * Returns an event stream file descriptor or failure.
1853 * (typically, one event stream records events from one CPU)
1854 * LTTNG_KERNEL_EVENT
1855 * Returns an event file descriptor or failure.
1856 * LTTNG_KERNEL_CONTEXT
1857 * Prepend a context field to each event in the channel
1858 * LTTNG_KERNEL_ENABLE
1859 * Enable recording for events in this channel (weak enable)
1860 * LTTNG_KERNEL_DISABLE
1861 * Disable recording for events in this channel (strong disable)
1863 * Channel and event file descriptors also hold a reference on the session.
1866 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1868 struct lttng_channel
*channel
= file
->private_data
;
1871 case LTTNG_KERNEL_OLD_STREAM
:
1872 case LTTNG_KERNEL_STREAM
:
1873 return lttng_abi_open_stream(file
);
1874 case LTTNG_KERNEL_OLD_EVENT
:
1876 struct lttng_kernel_event
*uevent_param
;
1877 struct lttng_kernel_old_event
*old_uevent_param
;
1880 uevent_param
= kmalloc(sizeof(struct lttng_kernel_event
),
1882 if (!uevent_param
) {
1886 old_uevent_param
= kmalloc(
1887 sizeof(struct lttng_kernel_old_event
),
1889 if (!old_uevent_param
) {
1891 goto old_event_error_free_param
;
1893 if (copy_from_user(old_uevent_param
,
1894 (struct lttng_kernel_old_event __user
*) arg
,
1895 sizeof(struct lttng_kernel_old_event
))) {
1897 goto old_event_error_free_old_param
;
1900 memcpy(uevent_param
->name
, old_uevent_param
->name
,
1901 sizeof(uevent_param
->name
));
1902 uevent_param
->instrumentation
=
1903 old_uevent_param
->instrumentation
;
1905 switch (old_uevent_param
->instrumentation
) {
1906 case LTTNG_KERNEL_KPROBE
:
1907 uevent_param
->u
.kprobe
.addr
=
1908 old_uevent_param
->u
.kprobe
.addr
;
1909 uevent_param
->u
.kprobe
.offset
=
1910 old_uevent_param
->u
.kprobe
.offset
;
1911 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
1912 old_uevent_param
->u
.kprobe
.symbol_name
,
1913 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
1915 case LTTNG_KERNEL_KRETPROBE
:
1916 uevent_param
->u
.kretprobe
.addr
=
1917 old_uevent_param
->u
.kretprobe
.addr
;
1918 uevent_param
->u
.kretprobe
.offset
=
1919 old_uevent_param
->u
.kretprobe
.offset
;
1920 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
1921 old_uevent_param
->u
.kretprobe
.symbol_name
,
1922 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
1924 case LTTNG_KERNEL_FUNCTION
:
1925 memcpy(uevent_param
->u
.ftrace
.symbol_name
,
1926 old_uevent_param
->u
.ftrace
.symbol_name
,
1927 sizeof(uevent_param
->u
.ftrace
.symbol_name
));
1932 ret
= lttng_abi_create_event(file
, uevent_param
);
1934 old_event_error_free_old_param
:
1935 kfree(old_uevent_param
);
1936 old_event_error_free_param
:
1937 kfree(uevent_param
);
1941 case LTTNG_KERNEL_EVENT
:
1943 struct lttng_kernel_event uevent_param
;
1945 if (copy_from_user(&uevent_param
,
1946 (struct lttng_kernel_event __user
*) arg
,
1947 sizeof(uevent_param
)))
1949 return lttng_abi_create_event(file
, &uevent_param
);
1951 case LTTNG_KERNEL_OLD_CONTEXT
:
1953 struct lttng_kernel_context
*ucontext_param
;
1954 struct lttng_kernel_old_context
*old_ucontext_param
;
1957 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_context
),
1959 if (!ucontext_param
) {
1963 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_old_context
),
1965 if (!old_ucontext_param
) {
1967 goto old_ctx_error_free_param
;
1970 if (copy_from_user(old_ucontext_param
,
1971 (struct lttng_kernel_old_context __user
*) arg
,
1972 sizeof(struct lttng_kernel_old_context
))) {
1974 goto old_ctx_error_free_old_param
;
1976 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
1977 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
1978 sizeof(ucontext_param
->padding
));
1979 /* only type that uses the union */
1980 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_COUNTER
) {
1981 ucontext_param
->u
.perf_counter
.type
=
1982 old_ucontext_param
->u
.perf_counter
.type
;
1983 ucontext_param
->u
.perf_counter
.config
=
1984 old_ucontext_param
->u
.perf_counter
.config
;
1985 memcpy(ucontext_param
->u
.perf_counter
.name
,
1986 old_ucontext_param
->u
.perf_counter
.name
,
1987 sizeof(ucontext_param
->u
.perf_counter
.name
));
1990 ret
= lttng_abi_add_context(file
,
1992 &channel
->ctx
, channel
->session
);
1994 old_ctx_error_free_old_param
:
1995 kfree(old_ucontext_param
);
1996 old_ctx_error_free_param
:
1997 kfree(ucontext_param
);
2001 case LTTNG_KERNEL_CONTEXT
:
2003 struct lttng_kernel_context ucontext_param
;
2005 if (copy_from_user(&ucontext_param
,
2006 (struct lttng_kernel_context __user
*) arg
,
2007 sizeof(ucontext_param
)))
2009 return lttng_abi_add_context(file
,
2011 &channel
->ctx
, channel
->session
);
2013 case LTTNG_KERNEL_OLD_ENABLE
:
2014 case LTTNG_KERNEL_ENABLE
:
2015 return lttng_channel_enable(channel
);
2016 case LTTNG_KERNEL_OLD_DISABLE
:
2017 case LTTNG_KERNEL_DISABLE
:
2018 return lttng_channel_disable(channel
);
2019 case LTTNG_KERNEL_SYSCALL_MASK
:
2020 return lttng_channel_syscall_mask(channel
,
2021 (struct lttng_kernel_syscall_mask __user
*) arg
);
2023 return -ENOIOCTLCMD
;
2028 * lttng_metadata_ioctl - lttng syscall through ioctl
2034 * This ioctl implements lttng commands:
2035 * LTTNG_KERNEL_STREAM
2036 * Returns an event stream file descriptor or failure.
2038 * Channel and event file descriptors also hold a reference on the session.
2041 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2044 case LTTNG_KERNEL_OLD_STREAM
:
2045 case LTTNG_KERNEL_STREAM
:
2046 return lttng_abi_open_metadata_stream(file
);
2048 return -ENOIOCTLCMD
;
2053 * lttng_channel_poll - lttng stream addition/removal monitoring
2058 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
2060 struct lttng_channel
*channel
= file
->private_data
;
2061 unsigned int mask
= 0;
2063 if (file
->f_mode
& FMODE_READ
) {
2064 poll_wait_set_exclusive(wait
);
2065 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
2068 if (channel
->ops
->is_disabled(channel
->chan
))
2070 if (channel
->ops
->is_finalized(channel
->chan
))
2072 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
2073 return POLLIN
| POLLRDNORM
;
2081 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
2083 struct lttng_channel
*channel
= file
->private_data
;
2086 fput(channel
->session
->file
);
2091 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
2093 struct lttng_channel
*channel
= file
->private_data
;
2096 fput(channel
->session
->file
);
2097 lttng_metadata_channel_destroy(channel
);
2103 static const struct file_operations lttng_channel_fops
= {
2104 .owner
= THIS_MODULE
,
2105 .release
= lttng_channel_release
,
2106 .poll
= lttng_channel_poll
,
2107 .unlocked_ioctl
= lttng_channel_ioctl
,
2108 #ifdef CONFIG_COMPAT
2109 .compat_ioctl
= lttng_channel_ioctl
,
2113 static const struct file_operations lttng_metadata_fops
= {
2114 .owner
= THIS_MODULE
,
2115 .release
= lttng_metadata_channel_release
,
2116 .unlocked_ioctl
= lttng_metadata_ioctl
,
2117 #ifdef CONFIG_COMPAT
2118 .compat_ioctl
= lttng_metadata_ioctl
,
2123 * lttng_event_ioctl - lttng syscall through ioctl
2129 * This ioctl implements lttng commands:
2130 * LTTNG_KERNEL_CONTEXT
2131 * Prepend a context field to each record of this event
2132 * LTTNG_KERNEL_ENABLE
2133 * Enable recording for this event (weak enable)
2134 * LTTNG_KERNEL_DISABLE
2135 * Disable recording for this event (strong disable)
2138 long lttng_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2140 struct lttng_event
*event
;
2141 struct lttng_event_enabler
*event_enabler
;
2142 enum lttng_event_type
*evtype
= file
->private_data
;
2145 case LTTNG_KERNEL_OLD_CONTEXT
:
2147 /* Not implemented */
2150 case LTTNG_KERNEL_CONTEXT
:
2152 /* Not implemented */
2155 case LTTNG_KERNEL_OLD_ENABLE
:
2156 case LTTNG_KERNEL_ENABLE
:
2158 case LTTNG_TYPE_EVENT
:
2159 event
= file
->private_data
;
2160 return lttng_event_enable(event
);
2161 case LTTNG_TYPE_ENABLER
:
2162 event_enabler
= file
->private_data
;
2163 return lttng_event_enabler_enable(event_enabler
);
2168 case LTTNG_KERNEL_OLD_DISABLE
:
2169 case LTTNG_KERNEL_DISABLE
:
2171 case LTTNG_TYPE_EVENT
:
2172 event
= file
->private_data
;
2173 return lttng_event_disable(event
);
2174 case LTTNG_TYPE_ENABLER
:
2175 event_enabler
= file
->private_data
;
2176 return lttng_event_enabler_disable(event_enabler
);
2181 case LTTNG_KERNEL_FILTER
:
2183 case LTTNG_TYPE_EVENT
:
2185 case LTTNG_TYPE_ENABLER
:
2187 event_enabler
= file
->private_data
;
2188 return lttng_event_enabler_attach_bytecode(event_enabler
,
2189 (struct lttng_kernel_filter_bytecode __user
*) arg
);
2195 case LTTNG_KERNEL_ADD_CALLSITE
:
2197 case LTTNG_TYPE_EVENT
:
2198 event
= file
->private_data
;
2199 return lttng_event_add_callsite(event
,
2200 (struct lttng_kernel_event_callsite __user
*) arg
);
2201 case LTTNG_TYPE_ENABLER
:
2208 return -ENOIOCTLCMD
;
2213 int lttng_event_release(struct inode
*inode
, struct file
*file
)
2215 struct lttng_event
*event
;
2216 struct lttng_event_enabler
*event_enabler
;
2217 enum lttng_event_type
*evtype
= file
->private_data
;
2223 case LTTNG_TYPE_EVENT
:
2224 event
= file
->private_data
;
2226 fput(event
->chan
->file
);
2228 case LTTNG_TYPE_ENABLER
:
2229 event_enabler
= file
->private_data
;
2231 fput(event_enabler
->chan
->file
);
2241 /* TODO: filter control ioctl */
2242 static const struct file_operations lttng_event_fops
= {
2243 .owner
= THIS_MODULE
,
2244 .release
= lttng_event_release
,
2245 .unlocked_ioctl
= lttng_event_ioctl
,
2246 #ifdef CONFIG_COMPAT
2247 .compat_ioctl
= lttng_event_ioctl
,
2251 static int put_u64(uint64_t val
, unsigned long arg
)
2253 return put_user(val
, (uint64_t __user
*) arg
);
2256 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
2257 unsigned int cmd
, unsigned long arg
)
2259 struct lib_ring_buffer
*buf
= filp
->private_data
;
2260 struct channel
*chan
= buf
->backend
.chan
;
2261 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
2262 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
2265 if (atomic_read(&chan
->record_disabled
))
2269 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
2273 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
2276 return put_u64(ts
, arg
);
2278 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END
:
2282 ret
= ops
->timestamp_end(config
, buf
, &ts
);
2285 return put_u64(ts
, arg
);
2287 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
:
2291 ret
= ops
->events_discarded(config
, buf
, &ed
);
2294 return put_u64(ed
, arg
);
2296 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE
:
2300 ret
= ops
->content_size(config
, buf
, &cs
);
2303 return put_u64(cs
, arg
);
2305 case LTTNG_RING_BUFFER_GET_PACKET_SIZE
:
2309 ret
= ops
->packet_size(config
, buf
, &ps
);
2312 return put_u64(ps
, arg
);
2314 case LTTNG_RING_BUFFER_GET_STREAM_ID
:
2318 ret
= ops
->stream_id(config
, buf
, &si
);
2321 return put_u64(si
, arg
);
2323 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
2327 ret
= ops
->current_timestamp(config
, buf
, &ts
);
2330 return put_u64(ts
, arg
);
2332 case LTTNG_RING_BUFFER_GET_SEQ_NUM
:
2336 ret
= ops
->sequence_number(config
, buf
, &seq
);
2339 return put_u64(seq
, arg
);
2341 case LTTNG_RING_BUFFER_INSTANCE_ID
:
2345 ret
= ops
->instance_id(config
, buf
, &id
);
2348 return put_u64(id
, arg
);
2351 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
2359 #ifdef CONFIG_COMPAT
2360 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
2361 unsigned int cmd
, unsigned long arg
)
2363 struct lib_ring_buffer
*buf
= filp
->private_data
;
2364 struct channel
*chan
= buf
->backend
.chan
;
2365 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
2366 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
2369 if (atomic_read(&chan
->record_disabled
))
2373 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
2377 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
2380 return put_u64(ts
, arg
);
2382 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
2386 ret
= ops
->timestamp_end(config
, buf
, &ts
);
2389 return put_u64(ts
, arg
);
2391 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
2395 ret
= ops
->events_discarded(config
, buf
, &ed
);
2398 return put_u64(ed
, arg
);
2400 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
2404 ret
= ops
->content_size(config
, buf
, &cs
);
2407 return put_u64(cs
, arg
);
2409 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
2413 ret
= ops
->packet_size(config
, buf
, &ps
);
2416 return put_u64(ps
, arg
);
2418 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID
:
2422 ret
= ops
->stream_id(config
, buf
, &si
);
2425 return put_u64(si
, arg
);
2427 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
2431 ret
= ops
->current_timestamp(config
, buf
, &ts
);
2434 return put_u64(ts
, arg
);
2436 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
2440 ret
= ops
->sequence_number(config
, buf
, &seq
);
2443 return put_u64(seq
, arg
);
2445 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID
:
2449 ret
= ops
->instance_id(config
, buf
, &id
);
2452 return put_u64(id
, arg
);
2455 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
2462 #endif /* CONFIG_COMPAT */
2464 static void lttng_stream_override_ring_buffer_fops(void)
2466 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
2467 lttng_stream_ring_buffer_file_operations
.open
=
2468 lib_ring_buffer_file_operations
.open
;
2469 lttng_stream_ring_buffer_file_operations
.release
=
2470 lib_ring_buffer_file_operations
.release
;
2471 lttng_stream_ring_buffer_file_operations
.poll
=
2472 lib_ring_buffer_file_operations
.poll
;
2473 lttng_stream_ring_buffer_file_operations
.splice_read
=
2474 lib_ring_buffer_file_operations
.splice_read
;
2475 lttng_stream_ring_buffer_file_operations
.mmap
=
2476 lib_ring_buffer_file_operations
.mmap
;
2477 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
2478 lttng_stream_ring_buffer_ioctl
;
2479 lttng_stream_ring_buffer_file_operations
.llseek
=
2480 lib_ring_buffer_file_operations
.llseek
;
2481 #ifdef CONFIG_COMPAT
2482 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
2483 lttng_stream_ring_buffer_compat_ioctl
;
2487 int __init
lttng_abi_init(void)
2491 wrapper_vmalloc_sync_all();
2494 ret
= lttng_tp_mempool_init();
2499 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
2500 <tng_proc_ops
, NULL
);
2502 if (!lttng_proc_dentry
) {
2503 printk(KERN_ERR
"Error creating LTTng control file\n");
2507 lttng_stream_override_ring_buffer_fops();
2511 lttng_tp_mempool_destroy();
2512 lttng_clock_unref();
2516 /* No __exit annotation because used by init error path too. */
2517 void lttng_abi_exit(void)
2519 lttng_tp_mempool_destroy();
2520 lttng_clock_unref();
2521 if (lttng_proc_dentry
)
2522 remove_proc_entry("lttng", NULL
);