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>
49 * This is LTTng's own personal way to create a system call as an external
50 * module. We use ioctl() on /proc/lttng.
53 static struct proc_dir_entry
*lttng_proc_dentry
;
54 static const struct file_operations lttng_fops
;
55 static const struct file_operations lttng_session_fops
;
56 static const struct file_operations lttng_channel_fops
;
57 static const struct file_operations lttng_metadata_fops
;
58 static const struct file_operations lttng_event_fops
;
59 static struct file_operations lttng_stream_ring_buffer_file_operations
;
61 static int put_u64(uint64_t val
, unsigned long arg
);
64 * Teardown management: opened file descriptors keep a refcount on the module,
65 * so it can only exit when all file descriptors are closed.
69 int lttng_abi_create_session(void)
71 struct lttng_session
*session
;
72 struct file
*session_file
;
75 session
= lttng_session_create();
78 session_fd
= lttng_get_unused_fd();
83 session_file
= anon_inode_getfile("[lttng_session]",
86 if (IS_ERR(session_file
)) {
87 ret
= PTR_ERR(session_file
);
90 session
->file
= session_file
;
91 fd_install(session_fd
, session_file
);
95 put_unused_fd(session_fd
);
97 lttng_session_destroy(session
);
102 int lttng_abi_tracepoint_list(void)
104 struct file
*tracepoint_list_file
;
107 file_fd
= lttng_get_unused_fd();
113 tracepoint_list_file
= anon_inode_getfile("[lttng_tracepoint_list]",
114 <tng_tracepoint_list_fops
,
116 if (IS_ERR(tracepoint_list_file
)) {
117 ret
= PTR_ERR(tracepoint_list_file
);
120 ret
= lttng_tracepoint_list_fops
.open(NULL
, tracepoint_list_file
);
123 fd_install(file_fd
, tracepoint_list_file
);
127 fput(tracepoint_list_file
);
129 put_unused_fd(file_fd
);
134 #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
136 int lttng_abi_syscall_list(void)
142 int lttng_abi_syscall_list(void)
144 struct file
*syscall_list_file
;
147 file_fd
= lttng_get_unused_fd();
153 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
154 <tng_syscall_list_fops
,
156 if (IS_ERR(syscall_list_file
)) {
157 ret
= PTR_ERR(syscall_list_file
);
160 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
163 fd_install(file_fd
, syscall_list_file
);
167 fput(syscall_list_file
);
169 put_unused_fd(file_fd
);
176 void lttng_abi_tracer_version(struct lttng_kernel_tracer_version
*v
)
178 v
->major
= LTTNG_MODULES_MAJOR_VERSION
;
179 v
->minor
= LTTNG_MODULES_MINOR_VERSION
;
180 v
->patchlevel
= LTTNG_MODULES_PATCHLEVEL_VERSION
;
184 void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version
*v
)
186 v
->major
= LTTNG_MODULES_ABI_MAJOR_VERSION
;
187 v
->minor
= LTTNG_MODULES_ABI_MINOR_VERSION
;
191 long lttng_abi_add_context(struct file
*file
,
192 struct lttng_kernel_context
*context_param
,
193 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
196 if (session
->been_active
)
199 switch (context_param
->ctx
) {
200 case LTTNG_KERNEL_CONTEXT_PID
:
201 return lttng_add_pid_to_ctx(ctx
);
202 case LTTNG_KERNEL_CONTEXT_PRIO
:
203 return lttng_add_prio_to_ctx(ctx
);
204 case LTTNG_KERNEL_CONTEXT_NICE
:
205 return lttng_add_nice_to_ctx(ctx
);
206 case LTTNG_KERNEL_CONTEXT_VPID
:
207 return lttng_add_vpid_to_ctx(ctx
);
208 case LTTNG_KERNEL_CONTEXT_TID
:
209 return lttng_add_tid_to_ctx(ctx
);
210 case LTTNG_KERNEL_CONTEXT_VTID
:
211 return lttng_add_vtid_to_ctx(ctx
);
212 case LTTNG_KERNEL_CONTEXT_PPID
:
213 return lttng_add_ppid_to_ctx(ctx
);
214 case LTTNG_KERNEL_CONTEXT_VPPID
:
215 return lttng_add_vppid_to_ctx(ctx
);
216 case LTTNG_KERNEL_CONTEXT_PERF_COUNTER
:
217 context_param
->u
.perf_counter
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
218 return lttng_add_perf_counter_to_ctx(context_param
->u
.perf_counter
.type
,
219 context_param
->u
.perf_counter
.config
,
220 context_param
->u
.perf_counter
.name
,
222 case LTTNG_KERNEL_CONTEXT_PROCNAME
:
223 return lttng_add_procname_to_ctx(ctx
);
224 case LTTNG_KERNEL_CONTEXT_HOSTNAME
:
225 return lttng_add_hostname_to_ctx(ctx
);
226 case LTTNG_KERNEL_CONTEXT_CPU_ID
:
227 return lttng_add_cpu_id_to_ctx(ctx
);
228 case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE
:
229 return lttng_add_interruptible_to_ctx(ctx
);
230 case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE
:
231 return lttng_add_need_reschedule_to_ctx(ctx
);
232 case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE
:
233 return lttng_add_preemptible_to_ctx(ctx
);
234 case LTTNG_KERNEL_CONTEXT_MIGRATABLE
:
235 return lttng_add_migratable_to_ctx(ctx
);
236 case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL
:
237 case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER
:
238 return lttng_add_callstack_to_ctx(ctx
, context_param
->ctx
);
239 case LTTNG_KERNEL_CONTEXT_CGROUP_NS
:
240 return lttng_add_cgroup_ns_to_ctx(ctx
);
241 case LTTNG_KERNEL_CONTEXT_IPC_NS
:
242 return lttng_add_ipc_ns_to_ctx(ctx
);
243 case LTTNG_KERNEL_CONTEXT_MNT_NS
:
244 return lttng_add_mnt_ns_to_ctx(ctx
);
245 case LTTNG_KERNEL_CONTEXT_NET_NS
:
246 return lttng_add_net_ns_to_ctx(ctx
);
247 case LTTNG_KERNEL_CONTEXT_PID_NS
:
248 return lttng_add_pid_ns_to_ctx(ctx
);
249 case LTTNG_KERNEL_CONTEXT_USER_NS
:
250 return lttng_add_user_ns_to_ctx(ctx
);
251 case LTTNG_KERNEL_CONTEXT_UTS_NS
:
252 return lttng_add_uts_ns_to_ctx(ctx
);
253 case LTTNG_KERNEL_CONTEXT_UID
:
254 return lttng_add_uid_to_ctx(ctx
);
255 case LTTNG_KERNEL_CONTEXT_EUID
:
256 return lttng_add_euid_to_ctx(ctx
);
257 case LTTNG_KERNEL_CONTEXT_SUID
:
258 return lttng_add_suid_to_ctx(ctx
);
259 case LTTNG_KERNEL_CONTEXT_GID
:
260 return lttng_add_gid_to_ctx(ctx
);
261 case LTTNG_KERNEL_CONTEXT_EGID
:
262 return lttng_add_egid_to_ctx(ctx
);
263 case LTTNG_KERNEL_CONTEXT_SGID
:
264 return lttng_add_sgid_to_ctx(ctx
);
265 case LTTNG_KERNEL_CONTEXT_VUID
:
266 return lttng_add_vuid_to_ctx(ctx
);
267 case LTTNG_KERNEL_CONTEXT_VEUID
:
268 return lttng_add_veuid_to_ctx(ctx
);
269 case LTTNG_KERNEL_CONTEXT_VSUID
:
270 return lttng_add_vsuid_to_ctx(ctx
);
271 case LTTNG_KERNEL_CONTEXT_VGID
:
272 return lttng_add_vgid_to_ctx(ctx
);
273 case LTTNG_KERNEL_CONTEXT_VEGID
:
274 return lttng_add_vegid_to_ctx(ctx
);
275 case LTTNG_KERNEL_CONTEXT_VSGID
:
276 return lttng_add_vsgid_to_ctx(ctx
);
283 * lttng_ioctl - lttng syscall through ioctl
289 * This ioctl implements lttng commands:
290 * LTTNG_KERNEL_SESSION
291 * Returns a LTTng trace session file descriptor
292 * LTTNG_KERNEL_TRACER_VERSION
293 * Returns the LTTng kernel tracer version
294 * LTTNG_KERNEL_TRACEPOINT_LIST
295 * Returns a file descriptor listing available tracepoints
296 * LTTNG_KERNEL_WAIT_QUIESCENT
297 * Returns after all previously running probes have completed
298 * LTTNG_KERNEL_TRACER_ABI_VERSION
299 * Returns the LTTng kernel tracer ABI version
301 * The returned session will be deleted when its file descriptor is closed.
304 long lttng_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
307 case LTTNG_KERNEL_OLD_SESSION
:
308 case LTTNG_KERNEL_SESSION
:
309 return lttng_abi_create_session();
310 case LTTNG_KERNEL_OLD_TRACER_VERSION
:
312 struct lttng_kernel_tracer_version v
;
313 struct lttng_kernel_old_tracer_version oldv
;
314 struct lttng_kernel_old_tracer_version
*uversion
=
315 (struct lttng_kernel_old_tracer_version __user
*) arg
;
317 lttng_abi_tracer_version(&v
);
318 oldv
.major
= v
.major
;
319 oldv
.minor
= v
.minor
;
320 oldv
.patchlevel
= v
.patchlevel
;
322 if (copy_to_user(uversion
, &oldv
, sizeof(oldv
)))
326 case LTTNG_KERNEL_TRACER_VERSION
:
328 struct lttng_kernel_tracer_version version
;
329 struct lttng_kernel_tracer_version
*uversion
=
330 (struct lttng_kernel_tracer_version __user
*) arg
;
332 lttng_abi_tracer_version(&version
);
334 if (copy_to_user(uversion
, &version
, sizeof(version
)))
338 case LTTNG_KERNEL_TRACER_ABI_VERSION
:
340 struct lttng_kernel_tracer_abi_version version
;
341 struct lttng_kernel_tracer_abi_version
*uversion
=
342 (struct lttng_kernel_tracer_abi_version __user
*) arg
;
344 lttng_abi_tracer_abi_version(&version
);
346 if (copy_to_user(uversion
, &version
, sizeof(version
)))
350 case LTTNG_KERNEL_OLD_TRACEPOINT_LIST
:
351 case LTTNG_KERNEL_TRACEPOINT_LIST
:
352 return lttng_abi_tracepoint_list();
353 case LTTNG_KERNEL_SYSCALL_LIST
:
354 return lttng_abi_syscall_list();
355 case LTTNG_KERNEL_OLD_WAIT_QUIESCENT
:
356 case LTTNG_KERNEL_WAIT_QUIESCENT
:
359 case LTTNG_KERNEL_OLD_CALIBRATE
:
361 struct lttng_kernel_old_calibrate __user
*ucalibrate
=
362 (struct lttng_kernel_old_calibrate __user
*) arg
;
363 struct lttng_kernel_old_calibrate old_calibrate
;
364 struct lttng_kernel_calibrate calibrate
;
367 if (copy_from_user(&old_calibrate
, ucalibrate
, sizeof(old_calibrate
)))
369 calibrate
.type
= old_calibrate
.type
;
370 ret
= lttng_calibrate(&calibrate
);
371 if (copy_to_user(ucalibrate
, &old_calibrate
, sizeof(old_calibrate
)))
375 case LTTNG_KERNEL_CALIBRATE
:
377 struct lttng_kernel_calibrate __user
*ucalibrate
=
378 (struct lttng_kernel_calibrate __user
*) arg
;
379 struct lttng_kernel_calibrate calibrate
;
382 if (copy_from_user(&calibrate
, ucalibrate
, sizeof(calibrate
)))
384 ret
= lttng_calibrate(&calibrate
);
385 if (copy_to_user(ucalibrate
, &calibrate
, sizeof(calibrate
)))
394 static const struct file_operations lttng_fops
= {
395 .owner
= THIS_MODULE
,
396 .unlocked_ioctl
= lttng_ioctl
,
398 .compat_ioctl
= lttng_ioctl
,
403 int lttng_abi_create_channel(struct file
*session_file
,
404 struct lttng_kernel_channel
*chan_param
,
405 enum channel_type channel_type
)
407 struct lttng_session
*session
= session_file
->private_data
;
408 const struct file_operations
*fops
= NULL
;
409 const char *transport_name
;
410 struct lttng_channel
*chan
;
411 struct file
*chan_file
;
415 chan_fd
= lttng_get_unused_fd();
420 switch (channel_type
) {
421 case PER_CPU_CHANNEL
:
422 fops
= <tng_channel_fops
;
424 case METADATA_CHANNEL
:
425 fops
= <tng_metadata_fops
;
429 chan_file
= anon_inode_getfile("[lttng_channel]",
432 if (IS_ERR(chan_file
)) {
433 ret
= PTR_ERR(chan_file
);
436 switch (channel_type
) {
437 case PER_CPU_CHANNEL
:
438 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
) {
439 transport_name
= chan_param
->overwrite
?
440 "relay-overwrite" : "relay-discard";
441 } else if (chan_param
->output
== LTTNG_KERNEL_MMAP
) {
442 transport_name
= chan_param
->overwrite
?
443 "relay-overwrite-mmap" : "relay-discard-mmap";
448 case METADATA_CHANNEL
:
449 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
)
450 transport_name
= "relay-metadata";
451 else if (chan_param
->output
== LTTNG_KERNEL_MMAP
)
452 transport_name
= "relay-metadata-mmap";
457 transport_name
= "<unknown>";
460 if (!atomic_long_add_unless(&session_file
->f_count
, 1, LONG_MAX
)) {
465 * We tolerate no failure path after channel creation. It will stay
466 * invariant for the rest of the session.
468 chan
= lttng_channel_create(session
, transport_name
, NULL
,
469 chan_param
->subbuf_size
,
470 chan_param
->num_subbuf
,
471 chan_param
->switch_timer_interval
,
472 chan_param
->read_timer_interval
,
478 chan
->file
= chan_file
;
479 chan_file
->private_data
= chan
;
480 fd_install(chan_fd
, chan_file
);
485 atomic_long_dec(&session_file
->f_count
);
489 put_unused_fd(chan_fd
);
495 int lttng_abi_session_set_name(struct lttng_session
*session
,
496 struct lttng_kernel_session_name
*name
)
500 len
= strnlen(name
->name
, LTTNG_KERNEL_SESSION_NAME_LEN
);
502 if (len
== LTTNG_KERNEL_SESSION_NAME_LEN
) {
503 /* Name is too long/malformed */
507 strcpy(session
->name
, name
->name
);
512 int lttng_abi_session_set_creation_time(struct lttng_session
*session
,
513 struct lttng_kernel_session_creation_time
*time
)
517 len
= strnlen(time
->iso8601
, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN
);
519 if (len
== LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN
) {
520 /* Time is too long/malformed */
524 strcpy(session
->creation_time
, time
->iso8601
);
529 * lttng_session_ioctl - lttng session fd ioctl
535 * This ioctl implements lttng commands:
536 * LTTNG_KERNEL_CHANNEL
537 * Returns a LTTng channel file descriptor
538 * LTTNG_KERNEL_ENABLE
539 * Enables tracing for a session (weak enable)
540 * LTTNG_KERNEL_DISABLE
541 * Disables tracing for a session (strong disable)
542 * LTTNG_KERNEL_METADATA
543 * Returns a LTTng metadata file descriptor
544 * LTTNG_KERNEL_SESSION_TRACK_PID
545 * Add PID to session tracker
546 * LTTNG_KERNEL_SESSION_UNTRACK_PID
547 * Remove PID from session tracker
549 * The returned channel will be deleted when its file descriptor is closed.
552 long lttng_session_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
554 struct lttng_session
*session
= file
->private_data
;
555 struct lttng_kernel_channel chan_param
;
556 struct lttng_kernel_old_channel old_chan_param
;
559 case LTTNG_KERNEL_OLD_CHANNEL
:
561 if (copy_from_user(&old_chan_param
,
562 (struct lttng_kernel_old_channel __user
*) arg
,
563 sizeof(struct lttng_kernel_old_channel
)))
565 chan_param
.overwrite
= old_chan_param
.overwrite
;
566 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
567 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
568 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
569 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
570 chan_param
.output
= old_chan_param
.output
;
572 return lttng_abi_create_channel(file
, &chan_param
,
575 case LTTNG_KERNEL_CHANNEL
:
577 if (copy_from_user(&chan_param
,
578 (struct lttng_kernel_channel __user
*) arg
,
579 sizeof(struct lttng_kernel_channel
)))
581 return lttng_abi_create_channel(file
, &chan_param
,
584 case LTTNG_KERNEL_OLD_SESSION_START
:
585 case LTTNG_KERNEL_OLD_ENABLE
:
586 case LTTNG_KERNEL_SESSION_START
:
587 case LTTNG_KERNEL_ENABLE
:
588 return lttng_session_enable(session
);
589 case LTTNG_KERNEL_OLD_SESSION_STOP
:
590 case LTTNG_KERNEL_OLD_DISABLE
:
591 case LTTNG_KERNEL_SESSION_STOP
:
592 case LTTNG_KERNEL_DISABLE
:
593 return lttng_session_disable(session
);
594 case LTTNG_KERNEL_OLD_METADATA
:
596 if (copy_from_user(&old_chan_param
,
597 (struct lttng_kernel_old_channel __user
*) arg
,
598 sizeof(struct lttng_kernel_old_channel
)))
600 chan_param
.overwrite
= old_chan_param
.overwrite
;
601 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
602 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
603 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
604 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
605 chan_param
.output
= old_chan_param
.output
;
607 return lttng_abi_create_channel(file
, &chan_param
,
610 case LTTNG_KERNEL_METADATA
:
612 if (copy_from_user(&chan_param
,
613 (struct lttng_kernel_channel __user
*) arg
,
614 sizeof(struct lttng_kernel_channel
)))
616 return lttng_abi_create_channel(file
, &chan_param
,
619 case LTTNG_KERNEL_SESSION_TRACK_PID
:
620 return lttng_session_track_pid(session
, (int) arg
);
621 case LTTNG_KERNEL_SESSION_UNTRACK_PID
:
622 return lttng_session_untrack_pid(session
, (int) arg
);
623 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
:
624 return lttng_session_list_tracker_pids(session
);
625 case LTTNG_KERNEL_SESSION_METADATA_REGEN
:
626 return lttng_session_metadata_regenerate(session
);
627 case LTTNG_KERNEL_SESSION_STATEDUMP
:
628 return lttng_session_statedump(session
);
629 case LTTNG_KERNEL_SESSION_SET_NAME
:
631 struct lttng_kernel_session_name name
;
633 if (copy_from_user(&name
,
634 (struct lttng_kernel_session_name __user
*) arg
,
635 sizeof(struct lttng_kernel_session_name
)))
637 return lttng_abi_session_set_name(session
, &name
);
639 case LTTNG_KERNEL_SESSION_SET_CREATION_TIME
:
641 struct lttng_kernel_session_creation_time time
;
643 if (copy_from_user(&time
,
644 (struct lttng_kernel_session_creation_time __user
*) arg
,
645 sizeof(struct lttng_kernel_session_creation_time
)))
647 return lttng_abi_session_set_creation_time(session
, &time
);
655 * Called when the last file reference is dropped.
657 * Big fat note: channels and events are invariant for the whole session after
658 * their creation. So this session destruction also destroys all channel and
659 * event structures specific to this session (they are not destroyed when their
660 * individual file is released).
663 int lttng_session_release(struct inode
*inode
, struct file
*file
)
665 struct lttng_session
*session
= file
->private_data
;
668 lttng_session_destroy(session
);
672 static const struct file_operations lttng_session_fops
= {
673 .owner
= THIS_MODULE
,
674 .release
= lttng_session_release
,
675 .unlocked_ioctl
= lttng_session_ioctl
,
677 .compat_ioctl
= lttng_session_ioctl
,
682 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
686 * Handles the poll operations for the metadata channels.
689 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
692 struct lttng_metadata_stream
*stream
= filp
->private_data
;
693 struct lib_ring_buffer
*buf
= stream
->priv
;
695 unsigned int mask
= 0;
697 if (filp
->f_mode
& FMODE_READ
) {
698 poll_wait_set_exclusive(wait
);
699 poll_wait(filp
, &stream
->read_wait
, wait
);
701 finalized
= stream
->finalized
;
704 * lib_ring_buffer_is_finalized() contains a smp_rmb()
705 * ordering finalized load before offsets loads.
707 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
712 mutex_lock(&stream
->metadata_cache
->lock
);
713 if (stream
->metadata_cache
->metadata_written
>
714 stream
->metadata_out
)
716 mutex_unlock(&stream
->metadata_cache
->lock
);
723 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
724 unsigned int cmd
, unsigned long arg
)
726 struct lttng_metadata_stream
*stream
= filp
->private_data
;
728 stream
->metadata_out
= stream
->metadata_in
;
732 * Reset the counter of how much metadata has been consumed to 0. That way,
733 * the consumer receives the content of the metadata cache unchanged. This is
734 * different from the metadata_regenerate where the offset from epoch is
735 * resampled, here we want the exact same content as the last time the metadata
736 * was generated. This command is only possible if all the metadata written
737 * in the cache has been output to the metadata stream to avoid corrupting the
740 * Return 0 on success, a negative value on error.
743 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
746 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
748 mutex_lock(&cache
->lock
);
749 if (stream
->metadata_out
!= cache
->metadata_written
) {
753 stream
->metadata_out
= 0;
754 stream
->metadata_in
= 0;
755 wake_up_interruptible(&stream
->read_wait
);
759 mutex_unlock(&cache
->lock
);
764 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
765 unsigned int cmd
, unsigned long arg
)
768 struct lttng_metadata_stream
*stream
= filp
->private_data
;
769 struct lib_ring_buffer
*buf
= stream
->priv
;
772 case RING_BUFFER_GET_NEXT_SUBBUF
:
774 struct lttng_metadata_stream
*stream
= filp
->private_data
;
775 struct lib_ring_buffer
*buf
= stream
->priv
;
776 struct channel
*chan
= buf
->backend
.chan
;
778 ret
= lttng_metadata_output_channel(stream
, chan
);
780 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
786 case RING_BUFFER_GET_SUBBUF
:
789 * Random access is not allowed for metadata channel.
793 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
794 case RING_BUFFER_FLUSH
:
796 struct lttng_metadata_stream
*stream
= filp
->private_data
;
797 struct lib_ring_buffer
*buf
= stream
->priv
;
798 struct channel
*chan
= buf
->backend
.chan
;
801 * Before doing the actual ring buffer flush, write up to one
802 * packet of metadata in the ring buffer.
804 ret
= lttng_metadata_output_channel(stream
, chan
);
809 case RING_BUFFER_GET_METADATA_VERSION
:
811 struct lttng_metadata_stream
*stream
= filp
->private_data
;
813 return put_u64(stream
->version
, arg
);
815 case RING_BUFFER_METADATA_CACHE_DUMP
:
817 struct lttng_metadata_stream
*stream
= filp
->private_data
;
819 return lttng_metadata_cache_dump(stream
);
824 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
826 /* Performing lib ring buffer ioctl after our own. */
827 ret
= lib_ring_buffer_ioctl(filp
, cmd
, arg
, buf
);
832 case RING_BUFFER_PUT_NEXT_SUBBUF
:
834 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
847 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
848 unsigned int cmd
, unsigned long arg
)
851 struct lttng_metadata_stream
*stream
= filp
->private_data
;
852 struct lib_ring_buffer
*buf
= stream
->priv
;
855 case RING_BUFFER_GET_NEXT_SUBBUF
:
857 struct lttng_metadata_stream
*stream
= filp
->private_data
;
858 struct lib_ring_buffer
*buf
= stream
->priv
;
859 struct channel
*chan
= buf
->backend
.chan
;
861 ret
= lttng_metadata_output_channel(stream
, chan
);
863 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
869 case RING_BUFFER_GET_SUBBUF
:
872 * Random access is not allowed for metadata channel.
876 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
877 case RING_BUFFER_FLUSH
:
879 struct lttng_metadata_stream
*stream
= filp
->private_data
;
880 struct lib_ring_buffer
*buf
= stream
->priv
;
881 struct channel
*chan
= buf
->backend
.chan
;
884 * Before doing the actual ring buffer flush, write up to one
885 * packet of metadata in the ring buffer.
887 ret
= lttng_metadata_output_channel(stream
, chan
);
892 case RING_BUFFER_GET_METADATA_VERSION
:
894 struct lttng_metadata_stream
*stream
= filp
->private_data
;
896 return put_u64(stream
->version
, arg
);
898 case RING_BUFFER_METADATA_CACHE_DUMP
:
900 struct lttng_metadata_stream
*stream
= filp
->private_data
;
902 return lttng_metadata_cache_dump(stream
);
907 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
909 /* Performing lib ring buffer ioctl after our own. */
910 ret
= lib_ring_buffer_compat_ioctl(filp
, cmd
, arg
, buf
);
915 case RING_BUFFER_PUT_NEXT_SUBBUF
:
917 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
930 * This is not used by anonymous file descriptors. This code is left
931 * there if we ever want to implement an inode with open() operation.
934 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
936 struct lttng_metadata_stream
*stream
= inode
->i_private
;
937 struct lib_ring_buffer
*buf
= stream
->priv
;
939 file
->private_data
= buf
;
941 * Since life-time of metadata cache differs from that of
942 * session, we need to keep our own reference on the transport.
944 if (!try_module_get(stream
->transport
->owner
)) {
945 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
948 return lib_ring_buffer_open(inode
, file
, buf
);
952 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
954 struct lttng_metadata_stream
*stream
= file
->private_data
;
955 struct lib_ring_buffer
*buf
= stream
->priv
;
957 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
958 module_put(stream
->transport
->owner
);
959 return lib_ring_buffer_release(inode
, file
, buf
);
963 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
964 struct pipe_inode_info
*pipe
, size_t len
,
967 struct lttng_metadata_stream
*stream
= in
->private_data
;
968 struct lib_ring_buffer
*buf
= stream
->priv
;
970 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
975 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
976 struct vm_area_struct
*vma
)
978 struct lttng_metadata_stream
*stream
= filp
->private_data
;
979 struct lib_ring_buffer
*buf
= stream
->priv
;
981 return lib_ring_buffer_mmap(filp
, vma
, buf
);
985 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
986 .owner
= THIS_MODULE
,
987 .open
= lttng_metadata_ring_buffer_open
,
988 .release
= lttng_metadata_ring_buffer_release
,
989 .poll
= lttng_metadata_ring_buffer_poll
,
990 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
991 .mmap
= lttng_metadata_ring_buffer_mmap
,
992 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
993 .llseek
= vfs_lib_ring_buffer_no_llseek
,
995 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
1000 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
1001 const struct file_operations
*fops
)
1004 struct file
*stream_file
;
1006 stream_fd
= lttng_get_unused_fd();
1007 if (stream_fd
< 0) {
1011 stream_file
= anon_inode_getfile("[lttng_stream]", fops
,
1012 stream_priv
, O_RDWR
);
1013 if (IS_ERR(stream_file
)) {
1014 ret
= PTR_ERR(stream_file
);
1018 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1019 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1020 * file descriptor, so we set FMODE_PREAD here.
1022 stream_file
->f_mode
|= FMODE_PREAD
;
1023 fd_install(stream_fd
, stream_file
);
1025 * The stream holds a reference to the channel within the generic ring
1026 * buffer library, so no need to hold a refcount on the channel and
1027 * session files here.
1032 put_unused_fd(stream_fd
);
1038 int lttng_abi_open_stream(struct file
*channel_file
)
1040 struct lttng_channel
*channel
= channel_file
->private_data
;
1041 struct lib_ring_buffer
*buf
;
1045 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1050 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1051 <tng_stream_ring_buffer_file_operations
);
1058 channel
->ops
->buffer_read_close(buf
);
1063 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
1065 struct lttng_channel
*channel
= channel_file
->private_data
;
1066 struct lttng_session
*session
= channel
->session
;
1067 struct lib_ring_buffer
*buf
;
1069 struct lttng_metadata_stream
*metadata_stream
;
1072 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1076 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1078 if (!metadata_stream
) {
1082 metadata_stream
->metadata_cache
= session
->metadata_cache
;
1083 init_waitqueue_head(&metadata_stream
->read_wait
);
1084 metadata_stream
->priv
= buf
;
1085 stream_priv
= metadata_stream
;
1086 metadata_stream
->transport
= channel
->transport
;
1089 * Since life-time of metadata cache differs from that of
1090 * session, we need to keep our own reference on the transport.
1092 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1093 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1098 if (!lttng_kref_get(&session
->metadata_cache
->refcount
)) {
1103 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1104 <tng_metadata_ring_buffer_file_operations
);
1108 list_add(&metadata_stream
->list
,
1109 &session
->metadata_cache
->metadata_stream
);
1113 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
1115 module_put(metadata_stream
->transport
->owner
);
1117 kfree(metadata_stream
);
1119 channel
->ops
->buffer_read_close(buf
);
1124 int lttng_abi_create_event(struct file
*channel_file
,
1125 struct lttng_kernel_event
*event_param
)
1127 struct lttng_channel
*channel
= channel_file
->private_data
;
1129 struct file
*event_file
;
1132 event_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1133 switch (event_param
->instrumentation
) {
1134 case LTTNG_KERNEL_KRETPROBE
:
1135 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1137 case LTTNG_KERNEL_KPROBE
:
1138 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1140 case LTTNG_KERNEL_FUNCTION
:
1141 event_param
->u
.ftrace
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1146 event_fd
= lttng_get_unused_fd();
1151 event_file
= anon_inode_getfile("[lttng_event]",
1154 if (IS_ERR(event_file
)) {
1155 ret
= PTR_ERR(event_file
);
1158 /* The event holds a reference on the channel */
1159 if (!atomic_long_add_unless(&channel_file
->f_count
, 1, LONG_MAX
)) {
1161 goto refcount_error
;
1163 if (event_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1164 || event_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1165 struct lttng_enabler
*enabler
;
1167 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1169 * If the event name is a star globbing pattern,
1170 * we create the special star globbing enabler.
1172 enabler
= lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB
,
1173 event_param
, channel
);
1175 enabler
= lttng_enabler_create(LTTNG_ENABLER_NAME
,
1176 event_param
, channel
);
1180 struct lttng_event
*event
;
1183 * We tolerate no failure path after event creation. It
1184 * will stay invariant for the rest of the session.
1186 event
= lttng_event_create(channel
, event_param
,
1188 event_param
->instrumentation
);
1189 WARN_ON_ONCE(!event
);
1190 if (IS_ERR(event
)) {
1191 ret
= PTR_ERR(event
);
1196 event_file
->private_data
= priv
;
1197 fd_install(event_fd
, event_file
);
1201 atomic_long_dec(&channel_file
->f_count
);
1205 put_unused_fd(event_fd
);
1211 * lttng_channel_ioctl - lttng syscall through ioctl
1217 * This ioctl implements lttng commands:
1218 * LTTNG_KERNEL_STREAM
1219 * Returns an event stream file descriptor or failure.
1220 * (typically, one event stream records events from one CPU)
1221 * LTTNG_KERNEL_EVENT
1222 * Returns an event file descriptor or failure.
1223 * LTTNG_KERNEL_CONTEXT
1224 * Prepend a context field to each event in the channel
1225 * LTTNG_KERNEL_ENABLE
1226 * Enable recording for events in this channel (weak enable)
1227 * LTTNG_KERNEL_DISABLE
1228 * Disable recording for events in this channel (strong disable)
1230 * Channel and event file descriptors also hold a reference on the session.
1233 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1235 struct lttng_channel
*channel
= file
->private_data
;
1238 case LTTNG_KERNEL_OLD_STREAM
:
1239 case LTTNG_KERNEL_STREAM
:
1240 return lttng_abi_open_stream(file
);
1241 case LTTNG_KERNEL_OLD_EVENT
:
1243 struct lttng_kernel_event
*uevent_param
;
1244 struct lttng_kernel_old_event
*old_uevent_param
;
1247 uevent_param
= kmalloc(sizeof(struct lttng_kernel_event
),
1249 if (!uevent_param
) {
1253 old_uevent_param
= kmalloc(
1254 sizeof(struct lttng_kernel_old_event
),
1256 if (!old_uevent_param
) {
1258 goto old_event_error_free_param
;
1260 if (copy_from_user(old_uevent_param
,
1261 (struct lttng_kernel_old_event __user
*) arg
,
1262 sizeof(struct lttng_kernel_old_event
))) {
1264 goto old_event_error_free_old_param
;
1267 memcpy(uevent_param
->name
, old_uevent_param
->name
,
1268 sizeof(uevent_param
->name
));
1269 uevent_param
->instrumentation
=
1270 old_uevent_param
->instrumentation
;
1272 switch (old_uevent_param
->instrumentation
) {
1273 case LTTNG_KERNEL_KPROBE
:
1274 uevent_param
->u
.kprobe
.addr
=
1275 old_uevent_param
->u
.kprobe
.addr
;
1276 uevent_param
->u
.kprobe
.offset
=
1277 old_uevent_param
->u
.kprobe
.offset
;
1278 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
1279 old_uevent_param
->u
.kprobe
.symbol_name
,
1280 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
1282 case LTTNG_KERNEL_KRETPROBE
:
1283 uevent_param
->u
.kretprobe
.addr
=
1284 old_uevent_param
->u
.kretprobe
.addr
;
1285 uevent_param
->u
.kretprobe
.offset
=
1286 old_uevent_param
->u
.kretprobe
.offset
;
1287 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
1288 old_uevent_param
->u
.kretprobe
.symbol_name
,
1289 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
1291 case LTTNG_KERNEL_FUNCTION
:
1292 memcpy(uevent_param
->u
.ftrace
.symbol_name
,
1293 old_uevent_param
->u
.ftrace
.symbol_name
,
1294 sizeof(uevent_param
->u
.ftrace
.symbol_name
));
1299 ret
= lttng_abi_create_event(file
, uevent_param
);
1301 old_event_error_free_old_param
:
1302 kfree(old_uevent_param
);
1303 old_event_error_free_param
:
1304 kfree(uevent_param
);
1308 case LTTNG_KERNEL_EVENT
:
1310 struct lttng_kernel_event uevent_param
;
1312 if (copy_from_user(&uevent_param
,
1313 (struct lttng_kernel_event __user
*) arg
,
1314 sizeof(uevent_param
)))
1316 return lttng_abi_create_event(file
, &uevent_param
);
1318 case LTTNG_KERNEL_OLD_CONTEXT
:
1320 struct lttng_kernel_context
*ucontext_param
;
1321 struct lttng_kernel_old_context
*old_ucontext_param
;
1324 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_context
),
1326 if (!ucontext_param
) {
1330 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_old_context
),
1332 if (!old_ucontext_param
) {
1334 goto old_ctx_error_free_param
;
1337 if (copy_from_user(old_ucontext_param
,
1338 (struct lttng_kernel_old_context __user
*) arg
,
1339 sizeof(struct lttng_kernel_old_context
))) {
1341 goto old_ctx_error_free_old_param
;
1343 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
1344 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
1345 sizeof(ucontext_param
->padding
));
1346 /* only type that uses the union */
1347 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_COUNTER
) {
1348 ucontext_param
->u
.perf_counter
.type
=
1349 old_ucontext_param
->u
.perf_counter
.type
;
1350 ucontext_param
->u
.perf_counter
.config
=
1351 old_ucontext_param
->u
.perf_counter
.config
;
1352 memcpy(ucontext_param
->u
.perf_counter
.name
,
1353 old_ucontext_param
->u
.perf_counter
.name
,
1354 sizeof(ucontext_param
->u
.perf_counter
.name
));
1357 ret
= lttng_abi_add_context(file
,
1359 &channel
->ctx
, channel
->session
);
1361 old_ctx_error_free_old_param
:
1362 kfree(old_ucontext_param
);
1363 old_ctx_error_free_param
:
1364 kfree(ucontext_param
);
1368 case LTTNG_KERNEL_CONTEXT
:
1370 struct lttng_kernel_context ucontext_param
;
1372 if (copy_from_user(&ucontext_param
,
1373 (struct lttng_kernel_context __user
*) arg
,
1374 sizeof(ucontext_param
)))
1376 return lttng_abi_add_context(file
,
1378 &channel
->ctx
, channel
->session
);
1380 case LTTNG_KERNEL_OLD_ENABLE
:
1381 case LTTNG_KERNEL_ENABLE
:
1382 return lttng_channel_enable(channel
);
1383 case LTTNG_KERNEL_OLD_DISABLE
:
1384 case LTTNG_KERNEL_DISABLE
:
1385 return lttng_channel_disable(channel
);
1386 case LTTNG_KERNEL_SYSCALL_MASK
:
1387 return lttng_channel_syscall_mask(channel
,
1388 (struct lttng_kernel_syscall_mask __user
*) arg
);
1390 return -ENOIOCTLCMD
;
1395 * lttng_metadata_ioctl - lttng syscall through ioctl
1401 * This ioctl implements lttng commands:
1402 * LTTNG_KERNEL_STREAM
1403 * Returns an event stream file descriptor or failure.
1405 * Channel and event file descriptors also hold a reference on the session.
1408 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1411 case LTTNG_KERNEL_OLD_STREAM
:
1412 case LTTNG_KERNEL_STREAM
:
1413 return lttng_abi_open_metadata_stream(file
);
1415 return -ENOIOCTLCMD
;
1420 * lttng_channel_poll - lttng stream addition/removal monitoring
1425 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
1427 struct lttng_channel
*channel
= file
->private_data
;
1428 unsigned int mask
= 0;
1430 if (file
->f_mode
& FMODE_READ
) {
1431 poll_wait_set_exclusive(wait
);
1432 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
1435 if (channel
->ops
->is_disabled(channel
->chan
))
1437 if (channel
->ops
->is_finalized(channel
->chan
))
1439 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
1440 return POLLIN
| POLLRDNORM
;
1448 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
1450 struct lttng_channel
*channel
= file
->private_data
;
1453 fput(channel
->session
->file
);
1458 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
1460 struct lttng_channel
*channel
= file
->private_data
;
1463 fput(channel
->session
->file
);
1464 lttng_metadata_channel_destroy(channel
);
1470 static const struct file_operations lttng_channel_fops
= {
1471 .owner
= THIS_MODULE
,
1472 .release
= lttng_channel_release
,
1473 .poll
= lttng_channel_poll
,
1474 .unlocked_ioctl
= lttng_channel_ioctl
,
1475 #ifdef CONFIG_COMPAT
1476 .compat_ioctl
= lttng_channel_ioctl
,
1480 static const struct file_operations lttng_metadata_fops
= {
1481 .owner
= THIS_MODULE
,
1482 .release
= lttng_metadata_channel_release
,
1483 .unlocked_ioctl
= lttng_metadata_ioctl
,
1484 #ifdef CONFIG_COMPAT
1485 .compat_ioctl
= lttng_metadata_ioctl
,
1490 * lttng_event_ioctl - lttng syscall through ioctl
1496 * This ioctl implements lttng commands:
1497 * LTTNG_KERNEL_CONTEXT
1498 * Prepend a context field to each record of this event
1499 * LTTNG_KERNEL_ENABLE
1500 * Enable recording for this event (weak enable)
1501 * LTTNG_KERNEL_DISABLE
1502 * Disable recording for this event (strong disable)
1505 long lttng_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1507 struct lttng_event
*event
;
1508 struct lttng_enabler
*enabler
;
1509 enum lttng_event_type
*evtype
= file
->private_data
;
1512 case LTTNG_KERNEL_OLD_CONTEXT
:
1514 /* Not implemented */
1517 case LTTNG_KERNEL_CONTEXT
:
1519 /* Not implemented */
1522 case LTTNG_KERNEL_OLD_ENABLE
:
1523 case LTTNG_KERNEL_ENABLE
:
1525 case LTTNG_TYPE_EVENT
:
1526 event
= file
->private_data
;
1527 return lttng_event_enable(event
);
1528 case LTTNG_TYPE_ENABLER
:
1529 enabler
= file
->private_data
;
1530 return lttng_enabler_enable(enabler
);
1535 case LTTNG_KERNEL_OLD_DISABLE
:
1536 case LTTNG_KERNEL_DISABLE
:
1538 case LTTNG_TYPE_EVENT
:
1539 event
= file
->private_data
;
1540 return lttng_event_disable(event
);
1541 case LTTNG_TYPE_ENABLER
:
1542 enabler
= file
->private_data
;
1543 return lttng_enabler_disable(enabler
);
1548 case LTTNG_KERNEL_FILTER
:
1550 case LTTNG_TYPE_EVENT
:
1552 case LTTNG_TYPE_ENABLER
:
1554 enabler
= file
->private_data
;
1555 return lttng_enabler_attach_bytecode(enabler
,
1556 (struct lttng_kernel_filter_bytecode __user
*) arg
);
1562 case LTTNG_KERNEL_ADD_CALLSITE
:
1564 case LTTNG_TYPE_EVENT
:
1565 event
= file
->private_data
;
1566 return lttng_event_add_callsite(event
,
1567 (struct lttng_kernel_event_callsite __user
*) arg
);
1568 case LTTNG_TYPE_ENABLER
:
1575 return -ENOIOCTLCMD
;
1580 int lttng_event_release(struct inode
*inode
, struct file
*file
)
1582 struct lttng_event
*event
;
1583 struct lttng_enabler
*enabler
;
1584 enum lttng_event_type
*evtype
= file
->private_data
;
1590 case LTTNG_TYPE_EVENT
:
1591 event
= file
->private_data
;
1593 fput(event
->chan
->file
);
1595 case LTTNG_TYPE_ENABLER
:
1596 enabler
= file
->private_data
;
1598 fput(enabler
->chan
->file
);
1608 /* TODO: filter control ioctl */
1609 static const struct file_operations lttng_event_fops
= {
1610 .owner
= THIS_MODULE
,
1611 .release
= lttng_event_release
,
1612 .unlocked_ioctl
= lttng_event_ioctl
,
1613 #ifdef CONFIG_COMPAT
1614 .compat_ioctl
= lttng_event_ioctl
,
1618 static int put_u64(uint64_t val
, unsigned long arg
)
1620 return put_user(val
, (uint64_t __user
*) arg
);
1623 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
1624 unsigned int cmd
, unsigned long arg
)
1626 struct lib_ring_buffer
*buf
= filp
->private_data
;
1627 struct channel
*chan
= buf
->backend
.chan
;
1628 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1629 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1632 if (atomic_read(&chan
->record_disabled
))
1636 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
1640 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1643 return put_u64(ts
, arg
);
1645 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END
:
1649 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1652 return put_u64(ts
, arg
);
1654 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
:
1658 ret
= ops
->events_discarded(config
, buf
, &ed
);
1661 return put_u64(ed
, arg
);
1663 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE
:
1667 ret
= ops
->content_size(config
, buf
, &cs
);
1670 return put_u64(cs
, arg
);
1672 case LTTNG_RING_BUFFER_GET_PACKET_SIZE
:
1676 ret
= ops
->packet_size(config
, buf
, &ps
);
1679 return put_u64(ps
, arg
);
1681 case LTTNG_RING_BUFFER_GET_STREAM_ID
:
1685 ret
= ops
->stream_id(config
, buf
, &si
);
1688 return put_u64(si
, arg
);
1690 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1694 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1697 return put_u64(ts
, arg
);
1699 case LTTNG_RING_BUFFER_GET_SEQ_NUM
:
1703 ret
= ops
->sequence_number(config
, buf
, &seq
);
1706 return put_u64(seq
, arg
);
1708 case LTTNG_RING_BUFFER_INSTANCE_ID
:
1712 ret
= ops
->instance_id(config
, buf
, &id
);
1715 return put_u64(id
, arg
);
1718 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
1726 #ifdef CONFIG_COMPAT
1727 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
1728 unsigned int cmd
, unsigned long arg
)
1730 struct lib_ring_buffer
*buf
= filp
->private_data
;
1731 struct channel
*chan
= buf
->backend
.chan
;
1732 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1733 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1736 if (atomic_read(&chan
->record_disabled
))
1740 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
1744 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1747 return put_u64(ts
, arg
);
1749 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
1753 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1756 return put_u64(ts
, arg
);
1758 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
1762 ret
= ops
->events_discarded(config
, buf
, &ed
);
1765 return put_u64(ed
, arg
);
1767 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
1771 ret
= ops
->content_size(config
, buf
, &cs
);
1774 return put_u64(cs
, arg
);
1776 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
1780 ret
= ops
->packet_size(config
, buf
, &ps
);
1783 return put_u64(ps
, arg
);
1785 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID
:
1789 ret
= ops
->stream_id(config
, buf
, &si
);
1792 return put_u64(si
, arg
);
1794 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1798 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1801 return put_u64(ts
, arg
);
1803 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
1807 ret
= ops
->sequence_number(config
, buf
, &seq
);
1810 return put_u64(seq
, arg
);
1812 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID
:
1816 ret
= ops
->instance_id(config
, buf
, &id
);
1819 return put_u64(id
, arg
);
1822 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
1829 #endif /* CONFIG_COMPAT */
1831 static void lttng_stream_override_ring_buffer_fops(void)
1833 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
1834 lttng_stream_ring_buffer_file_operations
.open
=
1835 lib_ring_buffer_file_operations
.open
;
1836 lttng_stream_ring_buffer_file_operations
.release
=
1837 lib_ring_buffer_file_operations
.release
;
1838 lttng_stream_ring_buffer_file_operations
.poll
=
1839 lib_ring_buffer_file_operations
.poll
;
1840 lttng_stream_ring_buffer_file_operations
.splice_read
=
1841 lib_ring_buffer_file_operations
.splice_read
;
1842 lttng_stream_ring_buffer_file_operations
.mmap
=
1843 lib_ring_buffer_file_operations
.mmap
;
1844 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
1845 lttng_stream_ring_buffer_ioctl
;
1846 lttng_stream_ring_buffer_file_operations
.llseek
=
1847 lib_ring_buffer_file_operations
.llseek
;
1848 #ifdef CONFIG_COMPAT
1849 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
1850 lttng_stream_ring_buffer_compat_ioctl
;
1854 int __init
lttng_abi_init(void)
1858 wrapper_vmalloc_sync_all();
1861 ret
= lttng_tp_mempool_init();
1866 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
1869 if (!lttng_proc_dentry
) {
1870 printk(KERN_ERR
"Error creating LTTng control file\n");
1874 lttng_stream_override_ring_buffer_fops();
1878 lttng_tp_mempool_destroy();
1879 lttng_clock_unref();
1883 /* No __exit annotation because used by init error path too. */
1884 void lttng_abi_exit(void)
1886 lttng_tp_mempool_destroy();
1887 lttng_clock_unref();
1888 if (lttng_proc_dentry
)
1889 remove_proc_entry("lttng", NULL
);