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 * lttng_session_ioctl - lttng session fd ioctl
501 * This ioctl implements lttng commands:
502 * LTTNG_KERNEL_CHANNEL
503 * Returns a LTTng channel file descriptor
504 * LTTNG_KERNEL_ENABLE
505 * Enables tracing for a session (weak enable)
506 * LTTNG_KERNEL_DISABLE
507 * Disables tracing for a session (strong disable)
508 * LTTNG_KERNEL_METADATA
509 * Returns a LTTng metadata file descriptor
510 * LTTNG_KERNEL_SESSION_TRACK_PID
511 * Add PID to session tracker
512 * LTTNG_KERNEL_SESSION_UNTRACK_PID
513 * Remove PID from session tracker
515 * The returned channel will be deleted when its file descriptor is closed.
518 long lttng_session_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
520 struct lttng_session
*session
= file
->private_data
;
523 case LTTNG_KERNEL_OLD_CHANNEL
:
525 struct lttng_kernel_channel chan_param
;
526 struct lttng_kernel_old_channel old_chan_param
;
528 if (copy_from_user(&old_chan_param
,
529 (struct lttng_kernel_old_channel __user
*) arg
,
530 sizeof(struct lttng_kernel_old_channel
)))
532 chan_param
.overwrite
= old_chan_param
.overwrite
;
533 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
534 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
535 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
536 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
537 chan_param
.output
= old_chan_param
.output
;
539 return lttng_abi_create_channel(file
, &chan_param
,
542 case LTTNG_KERNEL_CHANNEL
:
544 struct lttng_kernel_channel chan_param
;
546 if (copy_from_user(&chan_param
,
547 (struct lttng_kernel_channel __user
*) arg
,
548 sizeof(struct lttng_kernel_channel
)))
550 return lttng_abi_create_channel(file
, &chan_param
,
553 case LTTNG_KERNEL_OLD_SESSION_START
:
554 case LTTNG_KERNEL_OLD_ENABLE
:
555 case LTTNG_KERNEL_SESSION_START
:
556 case LTTNG_KERNEL_ENABLE
:
557 return lttng_session_enable(session
);
558 case LTTNG_KERNEL_OLD_SESSION_STOP
:
559 case LTTNG_KERNEL_OLD_DISABLE
:
560 case LTTNG_KERNEL_SESSION_STOP
:
561 case LTTNG_KERNEL_DISABLE
:
562 return lttng_session_disable(session
);
563 case LTTNG_KERNEL_OLD_METADATA
:
565 struct lttng_kernel_channel chan_param
;
566 struct lttng_kernel_old_channel old_chan_param
;
568 if (copy_from_user(&old_chan_param
,
569 (struct lttng_kernel_old_channel __user
*) arg
,
570 sizeof(struct lttng_kernel_old_channel
)))
572 chan_param
.overwrite
= old_chan_param
.overwrite
;
573 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
574 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
575 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
576 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
577 chan_param
.output
= old_chan_param
.output
;
579 return lttng_abi_create_channel(file
, &chan_param
,
582 case LTTNG_KERNEL_METADATA
:
584 struct lttng_kernel_channel chan_param
;
586 if (copy_from_user(&chan_param
,
587 (struct lttng_kernel_channel __user
*) arg
,
588 sizeof(struct lttng_kernel_channel
)))
590 return lttng_abi_create_channel(file
, &chan_param
,
593 case LTTNG_KERNEL_SESSION_TRACK_PID
:
594 return lttng_session_track_pid(session
, (int) arg
);
595 case LTTNG_KERNEL_SESSION_UNTRACK_PID
:
596 return lttng_session_untrack_pid(session
, (int) arg
);
597 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
:
598 return lttng_session_list_tracker_pids(session
);
599 case LTTNG_KERNEL_SESSION_METADATA_REGEN
:
600 return lttng_session_metadata_regenerate(session
);
601 case LTTNG_KERNEL_SESSION_STATEDUMP
:
602 return lttng_session_statedump(session
);
609 * Called when the last file reference is dropped.
611 * Big fat note: channels and events are invariant for the whole session after
612 * their creation. So this session destruction also destroys all channel and
613 * event structures specific to this session (they are not destroyed when their
614 * individual file is released).
617 int lttng_session_release(struct inode
*inode
, struct file
*file
)
619 struct lttng_session
*session
= file
->private_data
;
622 lttng_session_destroy(session
);
626 static const struct file_operations lttng_session_fops
= {
627 .owner
= THIS_MODULE
,
628 .release
= lttng_session_release
,
629 .unlocked_ioctl
= lttng_session_ioctl
,
631 .compat_ioctl
= lttng_session_ioctl
,
636 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
640 * Handles the poll operations for the metadata channels.
643 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
646 struct lttng_metadata_stream
*stream
= filp
->private_data
;
647 struct lib_ring_buffer
*buf
= stream
->priv
;
649 unsigned int mask
= 0;
651 if (filp
->f_mode
& FMODE_READ
) {
652 poll_wait_set_exclusive(wait
);
653 poll_wait(filp
, &stream
->read_wait
, wait
);
655 finalized
= stream
->finalized
;
658 * lib_ring_buffer_is_finalized() contains a smp_rmb()
659 * ordering finalized load before offsets loads.
661 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
666 mutex_lock(&stream
->metadata_cache
->lock
);
667 if (stream
->metadata_cache
->metadata_written
>
668 stream
->metadata_out
)
670 mutex_unlock(&stream
->metadata_cache
->lock
);
677 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
678 unsigned int cmd
, unsigned long arg
)
680 struct lttng_metadata_stream
*stream
= filp
->private_data
;
682 stream
->metadata_out
= stream
->metadata_in
;
686 * Reset the counter of how much metadata has been consumed to 0. That way,
687 * the consumer receives the content of the metadata cache unchanged. This is
688 * different from the metadata_regenerate where the offset from epoch is
689 * resampled, here we want the exact same content as the last time the metadata
690 * was generated. This command is only possible if all the metadata written
691 * in the cache has been output to the metadata stream to avoid corrupting the
694 * Return 0 on success, a negative value on error.
697 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
700 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
702 mutex_lock(&cache
->lock
);
703 if (stream
->metadata_out
!= cache
->metadata_written
) {
707 stream
->metadata_out
= 0;
708 stream
->metadata_in
= 0;
709 wake_up_interruptible(&stream
->read_wait
);
713 mutex_unlock(&cache
->lock
);
718 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
719 unsigned int cmd
, unsigned long arg
)
722 struct lttng_metadata_stream
*stream
= filp
->private_data
;
723 struct lib_ring_buffer
*buf
= stream
->priv
;
726 case RING_BUFFER_GET_NEXT_SUBBUF
:
728 struct lttng_metadata_stream
*stream
= filp
->private_data
;
729 struct lib_ring_buffer
*buf
= stream
->priv
;
730 struct channel
*chan
= buf
->backend
.chan
;
732 ret
= lttng_metadata_output_channel(stream
, chan
);
734 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
740 case RING_BUFFER_GET_SUBBUF
:
743 * Random access is not allowed for metadata channel.
747 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
748 case RING_BUFFER_FLUSH
:
750 struct lttng_metadata_stream
*stream
= filp
->private_data
;
751 struct lib_ring_buffer
*buf
= stream
->priv
;
752 struct channel
*chan
= buf
->backend
.chan
;
755 * Before doing the actual ring buffer flush, write up to one
756 * packet of metadata in the ring buffer.
758 ret
= lttng_metadata_output_channel(stream
, chan
);
763 case RING_BUFFER_GET_METADATA_VERSION
:
765 struct lttng_metadata_stream
*stream
= filp
->private_data
;
767 return put_u64(stream
->version
, arg
);
769 case RING_BUFFER_METADATA_CACHE_DUMP
:
771 struct lttng_metadata_stream
*stream
= filp
->private_data
;
773 return lttng_metadata_cache_dump(stream
);
778 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
780 /* Performing lib ring buffer ioctl after our own. */
781 ret
= lib_ring_buffer_ioctl(filp
, cmd
, arg
, buf
);
786 case RING_BUFFER_PUT_NEXT_SUBBUF
:
788 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
801 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
802 unsigned int cmd
, unsigned long arg
)
805 struct lttng_metadata_stream
*stream
= filp
->private_data
;
806 struct lib_ring_buffer
*buf
= stream
->priv
;
809 case RING_BUFFER_GET_NEXT_SUBBUF
:
811 struct lttng_metadata_stream
*stream
= filp
->private_data
;
812 struct lib_ring_buffer
*buf
= stream
->priv
;
813 struct channel
*chan
= buf
->backend
.chan
;
815 ret
= lttng_metadata_output_channel(stream
, chan
);
817 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
823 case RING_BUFFER_GET_SUBBUF
:
826 * Random access is not allowed for metadata channel.
830 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
831 case RING_BUFFER_FLUSH
:
833 struct lttng_metadata_stream
*stream
= filp
->private_data
;
834 struct lib_ring_buffer
*buf
= stream
->priv
;
835 struct channel
*chan
= buf
->backend
.chan
;
838 * Before doing the actual ring buffer flush, write up to one
839 * packet of metadata in the ring buffer.
841 ret
= lttng_metadata_output_channel(stream
, chan
);
846 case RING_BUFFER_GET_METADATA_VERSION
:
848 struct lttng_metadata_stream
*stream
= filp
->private_data
;
850 return put_u64(stream
->version
, arg
);
852 case RING_BUFFER_METADATA_CACHE_DUMP
:
854 struct lttng_metadata_stream
*stream
= filp
->private_data
;
856 return lttng_metadata_cache_dump(stream
);
861 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
863 /* Performing lib ring buffer ioctl after our own. */
864 ret
= lib_ring_buffer_compat_ioctl(filp
, cmd
, arg
, buf
);
869 case RING_BUFFER_PUT_NEXT_SUBBUF
:
871 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
884 * This is not used by anonymous file descriptors. This code is left
885 * there if we ever want to implement an inode with open() operation.
888 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
890 struct lttng_metadata_stream
*stream
= inode
->i_private
;
891 struct lib_ring_buffer
*buf
= stream
->priv
;
893 file
->private_data
= buf
;
895 * Since life-time of metadata cache differs from that of
896 * session, we need to keep our own reference on the transport.
898 if (!try_module_get(stream
->transport
->owner
)) {
899 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
902 return lib_ring_buffer_open(inode
, file
, buf
);
906 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
908 struct lttng_metadata_stream
*stream
= file
->private_data
;
909 struct lib_ring_buffer
*buf
= stream
->priv
;
911 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
912 module_put(stream
->transport
->owner
);
913 return lib_ring_buffer_release(inode
, file
, buf
);
917 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
918 struct pipe_inode_info
*pipe
, size_t len
,
921 struct lttng_metadata_stream
*stream
= in
->private_data
;
922 struct lib_ring_buffer
*buf
= stream
->priv
;
924 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
929 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
930 struct vm_area_struct
*vma
)
932 struct lttng_metadata_stream
*stream
= filp
->private_data
;
933 struct lib_ring_buffer
*buf
= stream
->priv
;
935 return lib_ring_buffer_mmap(filp
, vma
, buf
);
939 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
940 .owner
= THIS_MODULE
,
941 .open
= lttng_metadata_ring_buffer_open
,
942 .release
= lttng_metadata_ring_buffer_release
,
943 .poll
= lttng_metadata_ring_buffer_poll
,
944 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
945 .mmap
= lttng_metadata_ring_buffer_mmap
,
946 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
947 .llseek
= vfs_lib_ring_buffer_no_llseek
,
949 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
954 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
955 const struct file_operations
*fops
)
958 struct file
*stream_file
;
960 stream_fd
= lttng_get_unused_fd();
965 stream_file
= anon_inode_getfile("[lttng_stream]", fops
,
966 stream_priv
, O_RDWR
);
967 if (IS_ERR(stream_file
)) {
968 ret
= PTR_ERR(stream_file
);
972 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
973 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
974 * file descriptor, so we set FMODE_PREAD here.
976 stream_file
->f_mode
|= FMODE_PREAD
;
977 fd_install(stream_fd
, stream_file
);
979 * The stream holds a reference to the channel within the generic ring
980 * buffer library, so no need to hold a refcount on the channel and
981 * session files here.
986 put_unused_fd(stream_fd
);
992 int lttng_abi_open_stream(struct file
*channel_file
)
994 struct lttng_channel
*channel
= channel_file
->private_data
;
995 struct lib_ring_buffer
*buf
;
999 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1004 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1005 <tng_stream_ring_buffer_file_operations
);
1012 channel
->ops
->buffer_read_close(buf
);
1017 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
1019 struct lttng_channel
*channel
= channel_file
->private_data
;
1020 struct lttng_session
*session
= channel
->session
;
1021 struct lib_ring_buffer
*buf
;
1023 struct lttng_metadata_stream
*metadata_stream
;
1026 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1030 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1032 if (!metadata_stream
) {
1036 metadata_stream
->metadata_cache
= session
->metadata_cache
;
1037 init_waitqueue_head(&metadata_stream
->read_wait
);
1038 metadata_stream
->priv
= buf
;
1039 stream_priv
= metadata_stream
;
1040 metadata_stream
->transport
= channel
->transport
;
1043 * Since life-time of metadata cache differs from that of
1044 * session, we need to keep our own reference on the transport.
1046 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1047 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1052 if (!lttng_kref_get(&session
->metadata_cache
->refcount
)) {
1057 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1058 <tng_metadata_ring_buffer_file_operations
);
1062 list_add(&metadata_stream
->list
,
1063 &session
->metadata_cache
->metadata_stream
);
1067 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
1069 module_put(metadata_stream
->transport
->owner
);
1071 kfree(metadata_stream
);
1073 channel
->ops
->buffer_read_close(buf
);
1078 int lttng_abi_create_event(struct file
*channel_file
,
1079 struct lttng_kernel_event
*event_param
)
1081 struct lttng_channel
*channel
= channel_file
->private_data
;
1083 struct file
*event_file
;
1086 event_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1087 switch (event_param
->instrumentation
) {
1088 case LTTNG_KERNEL_KRETPROBE
:
1089 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1091 case LTTNG_KERNEL_KPROBE
:
1092 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1094 case LTTNG_KERNEL_FUNCTION
:
1095 event_param
->u
.ftrace
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1100 event_fd
= lttng_get_unused_fd();
1105 event_file
= anon_inode_getfile("[lttng_event]",
1108 if (IS_ERR(event_file
)) {
1109 ret
= PTR_ERR(event_file
);
1112 /* The event holds a reference on the channel */
1113 if (!atomic_long_add_unless(&channel_file
->f_count
, 1, LONG_MAX
)) {
1115 goto refcount_error
;
1117 if (event_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1118 || event_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1119 struct lttng_enabler
*enabler
;
1121 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1123 * If the event name is a star globbing pattern,
1124 * we create the special star globbing enabler.
1126 enabler
= lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB
,
1127 event_param
, channel
);
1129 enabler
= lttng_enabler_create(LTTNG_ENABLER_NAME
,
1130 event_param
, channel
);
1134 struct lttng_event
*event
;
1137 * We tolerate no failure path after event creation. It
1138 * will stay invariant for the rest of the session.
1140 event
= lttng_event_create(channel
, event_param
,
1142 event_param
->instrumentation
);
1143 WARN_ON_ONCE(!event
);
1144 if (IS_ERR(event
)) {
1145 ret
= PTR_ERR(event
);
1150 event_file
->private_data
= priv
;
1151 fd_install(event_fd
, event_file
);
1155 atomic_long_dec(&channel_file
->f_count
);
1159 put_unused_fd(event_fd
);
1165 * lttng_channel_ioctl - lttng syscall through ioctl
1171 * This ioctl implements lttng commands:
1172 * LTTNG_KERNEL_STREAM
1173 * Returns an event stream file descriptor or failure.
1174 * (typically, one event stream records events from one CPU)
1175 * LTTNG_KERNEL_EVENT
1176 * Returns an event file descriptor or failure.
1177 * LTTNG_KERNEL_CONTEXT
1178 * Prepend a context field to each event in the channel
1179 * LTTNG_KERNEL_ENABLE
1180 * Enable recording for events in this channel (weak enable)
1181 * LTTNG_KERNEL_DISABLE
1182 * Disable recording for events in this channel (strong disable)
1184 * Channel and event file descriptors also hold a reference on the session.
1187 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1189 struct lttng_channel
*channel
= file
->private_data
;
1192 case LTTNG_KERNEL_OLD_STREAM
:
1193 case LTTNG_KERNEL_STREAM
:
1194 return lttng_abi_open_stream(file
);
1195 case LTTNG_KERNEL_OLD_EVENT
:
1197 struct lttng_kernel_event
*uevent_param
;
1198 struct lttng_kernel_old_event
*old_uevent_param
;
1201 uevent_param
= kmalloc(sizeof(struct lttng_kernel_event
),
1203 if (!uevent_param
) {
1207 old_uevent_param
= kmalloc(
1208 sizeof(struct lttng_kernel_old_event
),
1210 if (!old_uevent_param
) {
1212 goto old_event_error_free_param
;
1214 if (copy_from_user(old_uevent_param
,
1215 (struct lttng_kernel_old_event __user
*) arg
,
1216 sizeof(struct lttng_kernel_old_event
))) {
1218 goto old_event_error_free_old_param
;
1221 memcpy(uevent_param
->name
, old_uevent_param
->name
,
1222 sizeof(uevent_param
->name
));
1223 uevent_param
->instrumentation
=
1224 old_uevent_param
->instrumentation
;
1226 switch (old_uevent_param
->instrumentation
) {
1227 case LTTNG_KERNEL_KPROBE
:
1228 uevent_param
->u
.kprobe
.addr
=
1229 old_uevent_param
->u
.kprobe
.addr
;
1230 uevent_param
->u
.kprobe
.offset
=
1231 old_uevent_param
->u
.kprobe
.offset
;
1232 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
1233 old_uevent_param
->u
.kprobe
.symbol_name
,
1234 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
1236 case LTTNG_KERNEL_KRETPROBE
:
1237 uevent_param
->u
.kretprobe
.addr
=
1238 old_uevent_param
->u
.kretprobe
.addr
;
1239 uevent_param
->u
.kretprobe
.offset
=
1240 old_uevent_param
->u
.kretprobe
.offset
;
1241 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
1242 old_uevent_param
->u
.kretprobe
.symbol_name
,
1243 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
1245 case LTTNG_KERNEL_FUNCTION
:
1246 memcpy(uevent_param
->u
.ftrace
.symbol_name
,
1247 old_uevent_param
->u
.ftrace
.symbol_name
,
1248 sizeof(uevent_param
->u
.ftrace
.symbol_name
));
1253 ret
= lttng_abi_create_event(file
, uevent_param
);
1255 old_event_error_free_old_param
:
1256 kfree(old_uevent_param
);
1257 old_event_error_free_param
:
1258 kfree(uevent_param
);
1262 case LTTNG_KERNEL_EVENT
:
1264 struct lttng_kernel_event uevent_param
;
1266 if (copy_from_user(&uevent_param
,
1267 (struct lttng_kernel_event __user
*) arg
,
1268 sizeof(uevent_param
)))
1270 return lttng_abi_create_event(file
, &uevent_param
);
1272 case LTTNG_KERNEL_OLD_CONTEXT
:
1274 struct lttng_kernel_context
*ucontext_param
;
1275 struct lttng_kernel_old_context
*old_ucontext_param
;
1278 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_context
),
1280 if (!ucontext_param
) {
1284 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_old_context
),
1286 if (!old_ucontext_param
) {
1288 goto old_ctx_error_free_param
;
1291 if (copy_from_user(old_ucontext_param
,
1292 (struct lttng_kernel_old_context __user
*) arg
,
1293 sizeof(struct lttng_kernel_old_context
))) {
1295 goto old_ctx_error_free_old_param
;
1297 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
1298 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
1299 sizeof(ucontext_param
->padding
));
1300 /* only type that uses the union */
1301 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_COUNTER
) {
1302 ucontext_param
->u
.perf_counter
.type
=
1303 old_ucontext_param
->u
.perf_counter
.type
;
1304 ucontext_param
->u
.perf_counter
.config
=
1305 old_ucontext_param
->u
.perf_counter
.config
;
1306 memcpy(ucontext_param
->u
.perf_counter
.name
,
1307 old_ucontext_param
->u
.perf_counter
.name
,
1308 sizeof(ucontext_param
->u
.perf_counter
.name
));
1311 ret
= lttng_abi_add_context(file
,
1313 &channel
->ctx
, channel
->session
);
1315 old_ctx_error_free_old_param
:
1316 kfree(old_ucontext_param
);
1317 old_ctx_error_free_param
:
1318 kfree(ucontext_param
);
1322 case LTTNG_KERNEL_CONTEXT
:
1324 struct lttng_kernel_context ucontext_param
;
1326 if (copy_from_user(&ucontext_param
,
1327 (struct lttng_kernel_context __user
*) arg
,
1328 sizeof(ucontext_param
)))
1330 return lttng_abi_add_context(file
,
1332 &channel
->ctx
, channel
->session
);
1334 case LTTNG_KERNEL_OLD_ENABLE
:
1335 case LTTNG_KERNEL_ENABLE
:
1336 return lttng_channel_enable(channel
);
1337 case LTTNG_KERNEL_OLD_DISABLE
:
1338 case LTTNG_KERNEL_DISABLE
:
1339 return lttng_channel_disable(channel
);
1340 case LTTNG_KERNEL_SYSCALL_MASK
:
1341 return lttng_channel_syscall_mask(channel
,
1342 (struct lttng_kernel_syscall_mask __user
*) arg
);
1344 return -ENOIOCTLCMD
;
1349 * lttng_metadata_ioctl - lttng syscall through ioctl
1355 * This ioctl implements lttng commands:
1356 * LTTNG_KERNEL_STREAM
1357 * Returns an event stream file descriptor or failure.
1359 * Channel and event file descriptors also hold a reference on the session.
1362 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1365 case LTTNG_KERNEL_OLD_STREAM
:
1366 case LTTNG_KERNEL_STREAM
:
1367 return lttng_abi_open_metadata_stream(file
);
1369 return -ENOIOCTLCMD
;
1374 * lttng_channel_poll - lttng stream addition/removal monitoring
1379 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
1381 struct lttng_channel
*channel
= file
->private_data
;
1382 unsigned int mask
= 0;
1384 if (file
->f_mode
& FMODE_READ
) {
1385 poll_wait_set_exclusive(wait
);
1386 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
1389 if (channel
->ops
->is_disabled(channel
->chan
))
1391 if (channel
->ops
->is_finalized(channel
->chan
))
1393 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
1394 return POLLIN
| POLLRDNORM
;
1402 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
1404 struct lttng_channel
*channel
= file
->private_data
;
1407 fput(channel
->session
->file
);
1412 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
1414 struct lttng_channel
*channel
= file
->private_data
;
1417 fput(channel
->session
->file
);
1418 lttng_metadata_channel_destroy(channel
);
1424 static const struct file_operations lttng_channel_fops
= {
1425 .owner
= THIS_MODULE
,
1426 .release
= lttng_channel_release
,
1427 .poll
= lttng_channel_poll
,
1428 .unlocked_ioctl
= lttng_channel_ioctl
,
1429 #ifdef CONFIG_COMPAT
1430 .compat_ioctl
= lttng_channel_ioctl
,
1434 static const struct file_operations lttng_metadata_fops
= {
1435 .owner
= THIS_MODULE
,
1436 .release
= lttng_metadata_channel_release
,
1437 .unlocked_ioctl
= lttng_metadata_ioctl
,
1438 #ifdef CONFIG_COMPAT
1439 .compat_ioctl
= lttng_metadata_ioctl
,
1444 * lttng_event_ioctl - lttng syscall through ioctl
1450 * This ioctl implements lttng commands:
1451 * LTTNG_KERNEL_CONTEXT
1452 * Prepend a context field to each record of this event
1453 * LTTNG_KERNEL_ENABLE
1454 * Enable recording for this event (weak enable)
1455 * LTTNG_KERNEL_DISABLE
1456 * Disable recording for this event (strong disable)
1459 long lttng_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1461 struct lttng_event
*event
;
1462 struct lttng_enabler
*enabler
;
1463 enum lttng_event_type
*evtype
= file
->private_data
;
1466 case LTTNG_KERNEL_OLD_CONTEXT
:
1468 /* Not implemented */
1471 case LTTNG_KERNEL_CONTEXT
:
1473 /* Not implemented */
1476 case LTTNG_KERNEL_OLD_ENABLE
:
1477 case LTTNG_KERNEL_ENABLE
:
1479 case LTTNG_TYPE_EVENT
:
1480 event
= file
->private_data
;
1481 return lttng_event_enable(event
);
1482 case LTTNG_TYPE_ENABLER
:
1483 enabler
= file
->private_data
;
1484 return lttng_enabler_enable(enabler
);
1489 case LTTNG_KERNEL_OLD_DISABLE
:
1490 case LTTNG_KERNEL_DISABLE
:
1492 case LTTNG_TYPE_EVENT
:
1493 event
= file
->private_data
;
1494 return lttng_event_disable(event
);
1495 case LTTNG_TYPE_ENABLER
:
1496 enabler
= file
->private_data
;
1497 return lttng_enabler_disable(enabler
);
1502 case LTTNG_KERNEL_FILTER
:
1504 case LTTNG_TYPE_EVENT
:
1506 case LTTNG_TYPE_ENABLER
:
1508 enabler
= file
->private_data
;
1509 return lttng_enabler_attach_bytecode(enabler
,
1510 (struct lttng_kernel_filter_bytecode __user
*) arg
);
1516 case LTTNG_KERNEL_ADD_CALLSITE
:
1518 case LTTNG_TYPE_EVENT
:
1519 event
= file
->private_data
;
1520 return lttng_event_add_callsite(event
,
1521 (struct lttng_kernel_event_callsite __user
*) arg
);
1522 case LTTNG_TYPE_ENABLER
:
1526 return -ENOIOCTLCMD
;
1531 int lttng_event_release(struct inode
*inode
, struct file
*file
)
1533 struct lttng_event
*event
;
1534 struct lttng_enabler
*enabler
;
1535 enum lttng_event_type
*evtype
= file
->private_data
;
1541 case LTTNG_TYPE_EVENT
:
1542 event
= file
->private_data
;
1544 fput(event
->chan
->file
);
1546 case LTTNG_TYPE_ENABLER
:
1547 enabler
= file
->private_data
;
1549 fput(enabler
->chan
->file
);
1559 /* TODO: filter control ioctl */
1560 static const struct file_operations lttng_event_fops
= {
1561 .owner
= THIS_MODULE
,
1562 .release
= lttng_event_release
,
1563 .unlocked_ioctl
= lttng_event_ioctl
,
1564 #ifdef CONFIG_COMPAT
1565 .compat_ioctl
= lttng_event_ioctl
,
1569 static int put_u64(uint64_t val
, unsigned long arg
)
1571 return put_user(val
, (uint64_t __user
*) arg
);
1574 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
1575 unsigned int cmd
, unsigned long arg
)
1577 struct lib_ring_buffer
*buf
= filp
->private_data
;
1578 struct channel
*chan
= buf
->backend
.chan
;
1579 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1580 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1583 if (atomic_read(&chan
->record_disabled
))
1587 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
1591 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1594 return put_u64(ts
, arg
);
1596 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END
:
1600 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1603 return put_u64(ts
, arg
);
1605 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
:
1609 ret
= ops
->events_discarded(config
, buf
, &ed
);
1612 return put_u64(ed
, arg
);
1614 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE
:
1618 ret
= ops
->content_size(config
, buf
, &cs
);
1621 return put_u64(cs
, arg
);
1623 case LTTNG_RING_BUFFER_GET_PACKET_SIZE
:
1627 ret
= ops
->packet_size(config
, buf
, &ps
);
1630 return put_u64(ps
, arg
);
1632 case LTTNG_RING_BUFFER_GET_STREAM_ID
:
1636 ret
= ops
->stream_id(config
, buf
, &si
);
1639 return put_u64(si
, arg
);
1641 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1645 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1648 return put_u64(ts
, arg
);
1650 case LTTNG_RING_BUFFER_GET_SEQ_NUM
:
1654 ret
= ops
->sequence_number(config
, buf
, &seq
);
1657 return put_u64(seq
, arg
);
1659 case LTTNG_RING_BUFFER_INSTANCE_ID
:
1663 ret
= ops
->instance_id(config
, buf
, &id
);
1666 return put_u64(id
, arg
);
1669 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
1677 #ifdef CONFIG_COMPAT
1678 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
1679 unsigned int cmd
, unsigned long arg
)
1681 struct lib_ring_buffer
*buf
= filp
->private_data
;
1682 struct channel
*chan
= buf
->backend
.chan
;
1683 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1684 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1687 if (atomic_read(&chan
->record_disabled
))
1691 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
1695 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1698 return put_u64(ts
, arg
);
1700 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
1704 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1707 return put_u64(ts
, arg
);
1709 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
1713 ret
= ops
->events_discarded(config
, buf
, &ed
);
1716 return put_u64(ed
, arg
);
1718 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
1722 ret
= ops
->content_size(config
, buf
, &cs
);
1725 return put_u64(cs
, arg
);
1727 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
1731 ret
= ops
->packet_size(config
, buf
, &ps
);
1734 return put_u64(ps
, arg
);
1736 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID
:
1740 ret
= ops
->stream_id(config
, buf
, &si
);
1743 return put_u64(si
, arg
);
1745 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1749 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1752 return put_u64(ts
, arg
);
1754 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
1758 ret
= ops
->sequence_number(config
, buf
, &seq
);
1761 return put_u64(seq
, arg
);
1763 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID
:
1767 ret
= ops
->instance_id(config
, buf
, &id
);
1770 return put_u64(id
, arg
);
1773 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
1780 #endif /* CONFIG_COMPAT */
1782 static void lttng_stream_override_ring_buffer_fops(void)
1784 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
1785 lttng_stream_ring_buffer_file_operations
.open
=
1786 lib_ring_buffer_file_operations
.open
;
1787 lttng_stream_ring_buffer_file_operations
.release
=
1788 lib_ring_buffer_file_operations
.release
;
1789 lttng_stream_ring_buffer_file_operations
.poll
=
1790 lib_ring_buffer_file_operations
.poll
;
1791 lttng_stream_ring_buffer_file_operations
.splice_read
=
1792 lib_ring_buffer_file_operations
.splice_read
;
1793 lttng_stream_ring_buffer_file_operations
.mmap
=
1794 lib_ring_buffer_file_operations
.mmap
;
1795 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
1796 lttng_stream_ring_buffer_ioctl
;
1797 lttng_stream_ring_buffer_file_operations
.llseek
=
1798 lib_ring_buffer_file_operations
.llseek
;
1799 #ifdef CONFIG_COMPAT
1800 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
1801 lttng_stream_ring_buffer_compat_ioctl
;
1805 int __init
lttng_abi_init(void)
1809 wrapper_vmalloc_sync_all();
1812 ret
= lttng_tp_mempool_init();
1817 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
1820 if (!lttng_proc_dentry
) {
1821 printk(KERN_ERR
"Error creating LTTng control file\n");
1825 lttng_stream_override_ring_buffer_fops();
1829 lttng_tp_mempool_destroy();
1830 lttng_clock_unref();
1834 /* No __exit annotation because used by init error path too. */
1835 void lttng_abi_exit(void)
1837 lttng_tp_mempool_destroy();
1838 lttng_clock_unref();
1839 if (lttng_proc_dentry
)
1840 remove_proc_entry("lttng", NULL
);