6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Mimic system calls for:
24 * - session creation, returns a file descriptor or failure.
25 * - channel creation, returns a file descriptor or failure.
26 * - Operates on a session file descriptor
27 * - Takes all channel options as parameters.
28 * - stream get, returns a file descriptor or failure.
29 * - Operates on a channel file descriptor.
30 * - stream notifier get, returns a file descriptor or failure.
31 * - Operates on a channel file descriptor.
32 * - event creation, returns a file descriptor or failure.
33 * - Operates on a channel file descriptor
34 * - Takes an event name as parameter
35 * - Takes an instrumentation source as parameter
36 * - e.g. tracepoints, dynamic_probes...
37 * - Takes instrumentation source specific arguments.
40 #include <linux/module.h>
41 #include <linux/proc_fs.h>
42 #include <linux/anon_inodes.h>
43 #include <linux/file.h>
44 #include <linux/uaccess.h>
45 #include <linux/slab.h>
46 #include <linux/err.h>
47 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
48 #include <wrapper/ringbuffer/vfs.h>
49 #include <wrapper/ringbuffer/backend.h>
50 #include <wrapper/ringbuffer/frontend.h>
51 #include <wrapper/poll.h>
52 #include <wrapper/file.h>
53 #include <wrapper/kref.h>
54 #include <lttng-string-utils.h>
55 #include <lttng-abi.h>
56 #include <lttng-abi-old.h>
57 #include <lttng-events.h>
58 #include <lttng-tracer.h>
59 #include <lib/ringbuffer/frontend_types.h>
62 * This is LTTng's own personal way to create a system call as an external
63 * module. We use ioctl() on /proc/lttng.
66 static struct proc_dir_entry
*lttng_proc_dentry
;
67 static const struct file_operations lttng_fops
;
68 static const struct file_operations lttng_session_fops
;
69 static const struct file_operations lttng_channel_fops
;
70 static const struct file_operations lttng_metadata_fops
;
71 static const struct file_operations lttng_event_fops
;
72 static struct file_operations lttng_stream_ring_buffer_file_operations
;
74 static int put_u64(uint64_t val
, unsigned long arg
);
77 * Teardown management: opened file descriptors keep a refcount on the module,
78 * so it can only exit when all file descriptors are closed.
82 int lttng_abi_create_session(void)
84 struct lttng_session
*session
;
85 struct file
*session_file
;
88 session
= lttng_session_create();
91 session_fd
= lttng_get_unused_fd();
96 session_file
= anon_inode_getfile("[lttng_session]",
99 if (IS_ERR(session_file
)) {
100 ret
= PTR_ERR(session_file
);
103 session
->file
= session_file
;
104 fd_install(session_fd
, session_file
);
108 put_unused_fd(session_fd
);
110 lttng_session_destroy(session
);
115 int lttng_abi_tracepoint_list(void)
117 struct file
*tracepoint_list_file
;
120 file_fd
= lttng_get_unused_fd();
126 tracepoint_list_file
= anon_inode_getfile("[lttng_tracepoint_list]",
127 <tng_tracepoint_list_fops
,
129 if (IS_ERR(tracepoint_list_file
)) {
130 ret
= PTR_ERR(tracepoint_list_file
);
133 ret
= lttng_tracepoint_list_fops
.open(NULL
, tracepoint_list_file
);
136 fd_install(file_fd
, tracepoint_list_file
);
140 fput(tracepoint_list_file
);
142 put_unused_fd(file_fd
);
147 #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
149 int lttng_abi_syscall_list(void)
155 int lttng_abi_syscall_list(void)
157 struct file
*syscall_list_file
;
160 file_fd
= lttng_get_unused_fd();
166 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
167 <tng_syscall_list_fops
,
169 if (IS_ERR(syscall_list_file
)) {
170 ret
= PTR_ERR(syscall_list_file
);
173 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
176 fd_install(file_fd
, syscall_list_file
);
180 fput(syscall_list_file
);
182 put_unused_fd(file_fd
);
189 void lttng_abi_tracer_version(struct lttng_kernel_tracer_version
*v
)
191 v
->major
= LTTNG_MODULES_MAJOR_VERSION
;
192 v
->minor
= LTTNG_MODULES_MINOR_VERSION
;
193 v
->patchlevel
= LTTNG_MODULES_PATCHLEVEL_VERSION
;
197 void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version
*v
)
199 v
->major
= LTTNG_MODULES_ABI_MAJOR_VERSION
;
200 v
->minor
= LTTNG_MODULES_ABI_MINOR_VERSION
;
204 long lttng_abi_add_context(struct file
*file
,
205 struct lttng_kernel_context
*context_param
,
206 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
209 if (session
->been_active
)
212 switch (context_param
->ctx
) {
213 case LTTNG_KERNEL_CONTEXT_PID
:
214 return lttng_add_pid_to_ctx(ctx
);
215 case LTTNG_KERNEL_CONTEXT_PRIO
:
216 return lttng_add_prio_to_ctx(ctx
);
217 case LTTNG_KERNEL_CONTEXT_NICE
:
218 return lttng_add_nice_to_ctx(ctx
);
219 case LTTNG_KERNEL_CONTEXT_VPID
:
220 return lttng_add_vpid_to_ctx(ctx
);
221 case LTTNG_KERNEL_CONTEXT_TID
:
222 return lttng_add_tid_to_ctx(ctx
);
223 case LTTNG_KERNEL_CONTEXT_VTID
:
224 return lttng_add_vtid_to_ctx(ctx
);
225 case LTTNG_KERNEL_CONTEXT_PPID
:
226 return lttng_add_ppid_to_ctx(ctx
);
227 case LTTNG_KERNEL_CONTEXT_VPPID
:
228 return lttng_add_vppid_to_ctx(ctx
);
229 case LTTNG_KERNEL_CONTEXT_PERF_COUNTER
:
230 context_param
->u
.perf_counter
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
231 return lttng_add_perf_counter_to_ctx(context_param
->u
.perf_counter
.type
,
232 context_param
->u
.perf_counter
.config
,
233 context_param
->u
.perf_counter
.name
,
235 case LTTNG_KERNEL_CONTEXT_PROCNAME
:
236 return lttng_add_procname_to_ctx(ctx
);
237 case LTTNG_KERNEL_CONTEXT_HOSTNAME
:
238 return lttng_add_hostname_to_ctx(ctx
);
239 case LTTNG_KERNEL_CONTEXT_CPU_ID
:
240 return lttng_add_cpu_id_to_ctx(ctx
);
241 case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE
:
242 return lttng_add_interruptible_to_ctx(ctx
);
243 case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE
:
244 return lttng_add_need_reschedule_to_ctx(ctx
);
245 case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE
:
246 return lttng_add_preemptible_to_ctx(ctx
);
247 case LTTNG_KERNEL_CONTEXT_MIGRATABLE
:
248 return lttng_add_migratable_to_ctx(ctx
);
255 * lttng_ioctl - lttng syscall through ioctl
261 * This ioctl implements lttng commands:
262 * LTTNG_KERNEL_SESSION
263 * Returns a LTTng trace session file descriptor
264 * LTTNG_KERNEL_TRACER_VERSION
265 * Returns the LTTng kernel tracer version
266 * LTTNG_KERNEL_TRACEPOINT_LIST
267 * Returns a file descriptor listing available tracepoints
268 * LTTNG_KERNEL_WAIT_QUIESCENT
269 * Returns after all previously running probes have completed
270 * LTTNG_KERNEL_TRACER_ABI_VERSION
271 * Returns the LTTng kernel tracer ABI version
273 * The returned session will be deleted when its file descriptor is closed.
276 long lttng_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
279 case LTTNG_KERNEL_OLD_SESSION
:
280 case LTTNG_KERNEL_SESSION
:
281 return lttng_abi_create_session();
282 case LTTNG_KERNEL_OLD_TRACER_VERSION
:
284 struct lttng_kernel_tracer_version v
;
285 struct lttng_kernel_old_tracer_version oldv
;
286 struct lttng_kernel_old_tracer_version
*uversion
=
287 (struct lttng_kernel_old_tracer_version __user
*) arg
;
289 lttng_abi_tracer_version(&v
);
290 oldv
.major
= v
.major
;
291 oldv
.minor
= v
.minor
;
292 oldv
.patchlevel
= v
.patchlevel
;
294 if (copy_to_user(uversion
, &oldv
, sizeof(oldv
)))
298 case LTTNG_KERNEL_TRACER_VERSION
:
300 struct lttng_kernel_tracer_version version
;
301 struct lttng_kernel_tracer_version
*uversion
=
302 (struct lttng_kernel_tracer_version __user
*) arg
;
304 lttng_abi_tracer_version(&version
);
306 if (copy_to_user(uversion
, &version
, sizeof(version
)))
310 case LTTNG_KERNEL_TRACER_ABI_VERSION
:
312 struct lttng_kernel_tracer_abi_version version
;
313 struct lttng_kernel_tracer_abi_version
*uversion
=
314 (struct lttng_kernel_tracer_abi_version __user
*) arg
;
316 lttng_abi_tracer_abi_version(&version
);
318 if (copy_to_user(uversion
, &version
, sizeof(version
)))
322 case LTTNG_KERNEL_OLD_TRACEPOINT_LIST
:
323 case LTTNG_KERNEL_TRACEPOINT_LIST
:
324 return lttng_abi_tracepoint_list();
325 case LTTNG_KERNEL_SYSCALL_LIST
:
326 return lttng_abi_syscall_list();
327 case LTTNG_KERNEL_OLD_WAIT_QUIESCENT
:
328 case LTTNG_KERNEL_WAIT_QUIESCENT
:
331 case LTTNG_KERNEL_OLD_CALIBRATE
:
333 struct lttng_kernel_old_calibrate __user
*ucalibrate
=
334 (struct lttng_kernel_old_calibrate __user
*) arg
;
335 struct lttng_kernel_old_calibrate old_calibrate
;
336 struct lttng_kernel_calibrate calibrate
;
339 if (copy_from_user(&old_calibrate
, ucalibrate
, sizeof(old_calibrate
)))
341 calibrate
.type
= old_calibrate
.type
;
342 ret
= lttng_calibrate(&calibrate
);
343 if (copy_to_user(ucalibrate
, &old_calibrate
, sizeof(old_calibrate
)))
347 case LTTNG_KERNEL_CALIBRATE
:
349 struct lttng_kernel_calibrate __user
*ucalibrate
=
350 (struct lttng_kernel_calibrate __user
*) arg
;
351 struct lttng_kernel_calibrate calibrate
;
354 if (copy_from_user(&calibrate
, ucalibrate
, sizeof(calibrate
)))
356 ret
= lttng_calibrate(&calibrate
);
357 if (copy_to_user(ucalibrate
, &calibrate
, sizeof(calibrate
)))
366 static const struct file_operations lttng_fops
= {
367 .owner
= THIS_MODULE
,
368 .unlocked_ioctl
= lttng_ioctl
,
370 .compat_ioctl
= lttng_ioctl
,
375 int lttng_abi_create_channel(struct file
*session_file
,
376 struct lttng_kernel_channel
*chan_param
,
377 enum channel_type channel_type
)
379 struct lttng_session
*session
= session_file
->private_data
;
380 const struct file_operations
*fops
= NULL
;
381 const char *transport_name
;
382 struct lttng_channel
*chan
;
383 struct file
*chan_file
;
387 chan_fd
= lttng_get_unused_fd();
392 switch (channel_type
) {
393 case PER_CPU_CHANNEL
:
394 fops
= <tng_channel_fops
;
396 case METADATA_CHANNEL
:
397 fops
= <tng_metadata_fops
;
401 chan_file
= anon_inode_getfile("[lttng_channel]",
404 if (IS_ERR(chan_file
)) {
405 ret
= PTR_ERR(chan_file
);
408 switch (channel_type
) {
409 case PER_CPU_CHANNEL
:
410 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
) {
411 transport_name
= chan_param
->overwrite
?
412 "relay-overwrite" : "relay-discard";
413 } else if (chan_param
->output
== LTTNG_KERNEL_MMAP
) {
414 transport_name
= chan_param
->overwrite
?
415 "relay-overwrite-mmap" : "relay-discard-mmap";
420 case METADATA_CHANNEL
:
421 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
)
422 transport_name
= "relay-metadata";
423 else if (chan_param
->output
== LTTNG_KERNEL_MMAP
)
424 transport_name
= "relay-metadata-mmap";
429 transport_name
= "<unknown>";
432 if (atomic_long_add_unless(&session_file
->f_count
,
433 1, INT_MAX
) == INT_MAX
) {
437 * We tolerate no failure path after channel creation. It will stay
438 * invariant for the rest of the session.
440 chan
= lttng_channel_create(session
, transport_name
, NULL
,
441 chan_param
->subbuf_size
,
442 chan_param
->num_subbuf
,
443 chan_param
->switch_timer_interval
,
444 chan_param
->read_timer_interval
,
450 chan
->file
= chan_file
;
451 chan_file
->private_data
= chan
;
452 fd_install(chan_fd
, chan_file
);
457 atomic_long_dec(&session_file
->f_count
);
461 put_unused_fd(chan_fd
);
467 * lttng_session_ioctl - lttng session fd ioctl
473 * This ioctl implements lttng commands:
474 * LTTNG_KERNEL_CHANNEL
475 * Returns a LTTng channel file descriptor
476 * LTTNG_KERNEL_ENABLE
477 * Enables tracing for a session (weak enable)
478 * LTTNG_KERNEL_DISABLE
479 * Disables tracing for a session (strong disable)
480 * LTTNG_KERNEL_METADATA
481 * Returns a LTTng metadata file descriptor
482 * LTTNG_KERNEL_SESSION_TRACK_PID
483 * Add PID to session tracker
484 * LTTNG_KERNEL_SESSION_UNTRACK_PID
485 * Remove PID from session tracker
487 * The returned channel will be deleted when its file descriptor is closed.
490 long lttng_session_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
492 struct lttng_session
*session
= file
->private_data
;
495 case LTTNG_KERNEL_OLD_CHANNEL
:
497 struct lttng_kernel_channel chan_param
;
498 struct lttng_kernel_old_channel old_chan_param
;
500 if (copy_from_user(&old_chan_param
,
501 (struct lttng_kernel_old_channel __user
*) arg
,
502 sizeof(struct lttng_kernel_old_channel
)))
504 chan_param
.overwrite
= old_chan_param
.overwrite
;
505 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
506 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
507 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
508 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
509 chan_param
.output
= old_chan_param
.output
;
511 return lttng_abi_create_channel(file
, &chan_param
,
514 case LTTNG_KERNEL_CHANNEL
:
516 struct lttng_kernel_channel chan_param
;
518 if (copy_from_user(&chan_param
,
519 (struct lttng_kernel_channel __user
*) arg
,
520 sizeof(struct lttng_kernel_channel
)))
522 return lttng_abi_create_channel(file
, &chan_param
,
525 case LTTNG_KERNEL_OLD_SESSION_START
:
526 case LTTNG_KERNEL_OLD_ENABLE
:
527 case LTTNG_KERNEL_SESSION_START
:
528 case LTTNG_KERNEL_ENABLE
:
529 return lttng_session_enable(session
);
530 case LTTNG_KERNEL_OLD_SESSION_STOP
:
531 case LTTNG_KERNEL_OLD_DISABLE
:
532 case LTTNG_KERNEL_SESSION_STOP
:
533 case LTTNG_KERNEL_DISABLE
:
534 return lttng_session_disable(session
);
535 case LTTNG_KERNEL_OLD_METADATA
:
537 struct lttng_kernel_channel chan_param
;
538 struct lttng_kernel_old_channel old_chan_param
;
540 if (copy_from_user(&old_chan_param
,
541 (struct lttng_kernel_old_channel __user
*) arg
,
542 sizeof(struct lttng_kernel_old_channel
)))
544 chan_param
.overwrite
= old_chan_param
.overwrite
;
545 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
546 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
547 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
548 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
549 chan_param
.output
= old_chan_param
.output
;
551 return lttng_abi_create_channel(file
, &chan_param
,
554 case LTTNG_KERNEL_METADATA
:
556 struct lttng_kernel_channel chan_param
;
558 if (copy_from_user(&chan_param
,
559 (struct lttng_kernel_channel __user
*) arg
,
560 sizeof(struct lttng_kernel_channel
)))
562 return lttng_abi_create_channel(file
, &chan_param
,
565 case LTTNG_KERNEL_SESSION_TRACK_PID
:
566 return lttng_session_track_pid(session
, (int) arg
);
567 case LTTNG_KERNEL_SESSION_UNTRACK_PID
:
568 return lttng_session_untrack_pid(session
, (int) arg
);
569 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
:
570 return lttng_session_list_tracker_pids(session
);
571 case LTTNG_KERNEL_SESSION_METADATA_REGEN
:
572 return lttng_session_metadata_regenerate(session
);
573 case LTTNG_KERNEL_SESSION_STATEDUMP
:
574 return lttng_session_statedump(session
);
581 * Called when the last file reference is dropped.
583 * Big fat note: channels and events are invariant for the whole session after
584 * their creation. So this session destruction also destroys all channel and
585 * event structures specific to this session (they are not destroyed when their
586 * individual file is released).
589 int lttng_session_release(struct inode
*inode
, struct file
*file
)
591 struct lttng_session
*session
= file
->private_data
;
594 lttng_session_destroy(session
);
598 static const struct file_operations lttng_session_fops
= {
599 .owner
= THIS_MODULE
,
600 .release
= lttng_session_release
,
601 .unlocked_ioctl
= lttng_session_ioctl
,
603 .compat_ioctl
= lttng_session_ioctl
,
608 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
612 * Handles the poll operations for the metadata channels.
615 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
618 struct lttng_metadata_stream
*stream
= filp
->private_data
;
619 struct lib_ring_buffer
*buf
= stream
->priv
;
621 unsigned int mask
= 0;
623 if (filp
->f_mode
& FMODE_READ
) {
624 poll_wait_set_exclusive(wait
);
625 poll_wait(filp
, &stream
->read_wait
, wait
);
627 finalized
= stream
->finalized
;
630 * lib_ring_buffer_is_finalized() contains a smp_rmb()
631 * ordering finalized load before offsets loads.
633 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
638 mutex_lock(&stream
->metadata_cache
->lock
);
639 if (stream
->metadata_cache
->metadata_written
>
640 stream
->metadata_out
)
642 mutex_unlock(&stream
->metadata_cache
->lock
);
649 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
650 unsigned int cmd
, unsigned long arg
)
652 struct lttng_metadata_stream
*stream
= filp
->private_data
;
654 stream
->metadata_out
= stream
->metadata_in
;
658 * Reset the counter of how much metadata has been consumed to 0. That way,
659 * the consumer receives the content of the metadata cache unchanged. This is
660 * different from the metadata_regenerate where the offset from epoch is
661 * resampled, here we want the exact same content as the last time the metadata
662 * was generated. This command is only possible if all the metadata written
663 * in the cache has been output to the metadata stream to avoid corrupting the
666 * Return 0 on success, a negative value on error.
669 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
672 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
674 mutex_lock(&cache
->lock
);
675 if (stream
->metadata_out
!= cache
->metadata_written
) {
679 stream
->metadata_out
= 0;
680 stream
->metadata_in
= 0;
681 wake_up_interruptible(&stream
->read_wait
);
685 mutex_unlock(&cache
->lock
);
690 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
691 unsigned int cmd
, unsigned long arg
)
694 struct lttng_metadata_stream
*stream
= filp
->private_data
;
695 struct lib_ring_buffer
*buf
= stream
->priv
;
698 case RING_BUFFER_GET_NEXT_SUBBUF
:
700 struct lttng_metadata_stream
*stream
= filp
->private_data
;
701 struct lib_ring_buffer
*buf
= stream
->priv
;
702 struct channel
*chan
= buf
->backend
.chan
;
704 ret
= lttng_metadata_output_channel(stream
, chan
);
706 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
712 case RING_BUFFER_GET_SUBBUF
:
715 * Random access is not allowed for metadata channel.
719 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
720 case RING_BUFFER_FLUSH
:
722 struct lttng_metadata_stream
*stream
= filp
->private_data
;
723 struct lib_ring_buffer
*buf
= stream
->priv
;
724 struct channel
*chan
= buf
->backend
.chan
;
727 * Before doing the actual ring buffer flush, write up to one
728 * packet of metadata in the ring buffer.
730 ret
= lttng_metadata_output_channel(stream
, chan
);
735 case RING_BUFFER_GET_METADATA_VERSION
:
737 struct lttng_metadata_stream
*stream
= filp
->private_data
;
739 return put_u64(stream
->version
, arg
);
741 case RING_BUFFER_METADATA_CACHE_DUMP
:
743 struct lttng_metadata_stream
*stream
= filp
->private_data
;
745 return lttng_metadata_cache_dump(stream
);
750 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
752 /* Performing lib ring buffer ioctl after our own. */
753 ret
= lib_ring_buffer_ioctl(filp
, cmd
, arg
, buf
);
758 case RING_BUFFER_PUT_NEXT_SUBBUF
:
760 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
773 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
774 unsigned int cmd
, unsigned long arg
)
777 struct lttng_metadata_stream
*stream
= filp
->private_data
;
778 struct lib_ring_buffer
*buf
= stream
->priv
;
781 case RING_BUFFER_GET_NEXT_SUBBUF
:
783 struct lttng_metadata_stream
*stream
= filp
->private_data
;
784 struct lib_ring_buffer
*buf
= stream
->priv
;
785 struct channel
*chan
= buf
->backend
.chan
;
787 ret
= lttng_metadata_output_channel(stream
, chan
);
789 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
795 case RING_BUFFER_GET_SUBBUF
:
798 * Random access is not allowed for metadata channel.
802 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
803 case RING_BUFFER_FLUSH
:
805 struct lttng_metadata_stream
*stream
= filp
->private_data
;
806 struct lib_ring_buffer
*buf
= stream
->priv
;
807 struct channel
*chan
= buf
->backend
.chan
;
810 * Before doing the actual ring buffer flush, write up to one
811 * packet of metadata in the ring buffer.
813 ret
= lttng_metadata_output_channel(stream
, chan
);
818 case RING_BUFFER_GET_METADATA_VERSION
:
820 struct lttng_metadata_stream
*stream
= filp
->private_data
;
822 return put_u64(stream
->version
, arg
);
824 case RING_BUFFER_METADATA_CACHE_DUMP
:
826 struct lttng_metadata_stream
*stream
= filp
->private_data
;
828 return lttng_metadata_cache_dump(stream
);
833 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
835 /* Performing lib ring buffer ioctl after our own. */
836 ret
= lib_ring_buffer_compat_ioctl(filp
, cmd
, arg
, buf
);
841 case RING_BUFFER_PUT_NEXT_SUBBUF
:
843 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
856 * This is not used by anonymous file descriptors. This code is left
857 * there if we ever want to implement an inode with open() operation.
860 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
862 struct lttng_metadata_stream
*stream
= inode
->i_private
;
863 struct lib_ring_buffer
*buf
= stream
->priv
;
865 file
->private_data
= buf
;
867 * Since life-time of metadata cache differs from that of
868 * session, we need to keep our own reference on the transport.
870 if (!try_module_get(stream
->transport
->owner
)) {
871 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
874 return lib_ring_buffer_open(inode
, file
, buf
);
878 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
880 struct lttng_metadata_stream
*stream
= file
->private_data
;
881 struct lib_ring_buffer
*buf
= stream
->priv
;
883 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
884 module_put(stream
->transport
->owner
);
885 return lib_ring_buffer_release(inode
, file
, buf
);
889 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
890 struct pipe_inode_info
*pipe
, size_t len
,
893 struct lttng_metadata_stream
*stream
= in
->private_data
;
894 struct lib_ring_buffer
*buf
= stream
->priv
;
896 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
901 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
902 struct vm_area_struct
*vma
)
904 struct lttng_metadata_stream
*stream
= filp
->private_data
;
905 struct lib_ring_buffer
*buf
= stream
->priv
;
907 return lib_ring_buffer_mmap(filp
, vma
, buf
);
911 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
912 .owner
= THIS_MODULE
,
913 .open
= lttng_metadata_ring_buffer_open
,
914 .release
= lttng_metadata_ring_buffer_release
,
915 .poll
= lttng_metadata_ring_buffer_poll
,
916 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
917 .mmap
= lttng_metadata_ring_buffer_mmap
,
918 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
919 .llseek
= vfs_lib_ring_buffer_no_llseek
,
921 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
926 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
927 const struct file_operations
*fops
)
930 struct file
*stream_file
;
932 stream_fd
= lttng_get_unused_fd();
937 stream_file
= anon_inode_getfile("[lttng_stream]", fops
,
938 stream_priv
, O_RDWR
);
939 if (IS_ERR(stream_file
)) {
940 ret
= PTR_ERR(stream_file
);
944 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
945 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
946 * file descriptor, so we set FMODE_PREAD here.
948 stream_file
->f_mode
|= FMODE_PREAD
;
949 fd_install(stream_fd
, stream_file
);
951 * The stream holds a reference to the channel within the generic ring
952 * buffer library, so no need to hold a refcount on the channel and
953 * session files here.
958 put_unused_fd(stream_fd
);
964 int lttng_abi_open_stream(struct file
*channel_file
)
966 struct lttng_channel
*channel
= channel_file
->private_data
;
967 struct lib_ring_buffer
*buf
;
971 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
976 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
977 <tng_stream_ring_buffer_file_operations
);
984 channel
->ops
->buffer_read_close(buf
);
989 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
991 struct lttng_channel
*channel
= channel_file
->private_data
;
992 struct lttng_session
*session
= channel
->session
;
993 struct lib_ring_buffer
*buf
;
995 struct lttng_metadata_stream
*metadata_stream
;
998 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1002 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1004 if (!metadata_stream
) {
1008 metadata_stream
->metadata_cache
= session
->metadata_cache
;
1009 init_waitqueue_head(&metadata_stream
->read_wait
);
1010 metadata_stream
->priv
= buf
;
1011 stream_priv
= metadata_stream
;
1012 metadata_stream
->transport
= channel
->transport
;
1015 * Since life-time of metadata cache differs from that of
1016 * session, we need to keep our own reference on the transport.
1018 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1019 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1024 if (!lttng_kref_get(&session
->metadata_cache
->refcount
)) {
1029 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1030 <tng_metadata_ring_buffer_file_operations
);
1034 list_add(&metadata_stream
->list
,
1035 &session
->metadata_cache
->metadata_stream
);
1039 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
1041 module_put(metadata_stream
->transport
->owner
);
1043 kfree(metadata_stream
);
1045 channel
->ops
->buffer_read_close(buf
);
1050 int lttng_abi_create_event(struct file
*channel_file
,
1051 struct lttng_kernel_event
*event_param
)
1053 struct lttng_channel
*channel
= channel_file
->private_data
;
1055 struct file
*event_file
;
1058 event_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1059 switch (event_param
->instrumentation
) {
1060 case LTTNG_KERNEL_KRETPROBE
:
1061 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1063 case LTTNG_KERNEL_KPROBE
:
1064 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1066 case LTTNG_KERNEL_FUNCTION
:
1067 event_param
->u
.ftrace
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1072 event_fd
= lttng_get_unused_fd();
1077 event_file
= anon_inode_getfile("[lttng_event]",
1080 if (IS_ERR(event_file
)) {
1081 ret
= PTR_ERR(event_file
);
1084 /* The event holds a reference on the channel */
1085 if (atomic_long_add_unless(&channel_file
->f_count
,
1086 1, INT_MAX
) == INT_MAX
) {
1088 goto refcount_error
;
1090 if (event_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1091 || event_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1092 struct lttng_enabler
*enabler
;
1094 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1096 * If the event name is a star globbing pattern,
1097 * we create the special star globbing enabler.
1099 enabler
= lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB
,
1100 event_param
, channel
);
1102 enabler
= lttng_enabler_create(LTTNG_ENABLER_NAME
,
1103 event_param
, channel
);
1107 struct lttng_event
*event
;
1110 * We tolerate no failure path after event creation. It
1111 * will stay invariant for the rest of the session.
1113 event
= lttng_event_create(channel
, event_param
,
1115 event_param
->instrumentation
);
1116 WARN_ON_ONCE(!event
);
1117 if (IS_ERR(event
)) {
1118 ret
= PTR_ERR(event
);
1123 event_file
->private_data
= priv
;
1124 fd_install(event_fd
, event_file
);
1128 atomic_long_dec(&channel_file
->f_count
);
1132 put_unused_fd(event_fd
);
1138 * lttng_channel_ioctl - lttng syscall through ioctl
1144 * This ioctl implements lttng commands:
1145 * LTTNG_KERNEL_STREAM
1146 * Returns an event stream file descriptor or failure.
1147 * (typically, one event stream records events from one CPU)
1148 * LTTNG_KERNEL_EVENT
1149 * Returns an event file descriptor or failure.
1150 * LTTNG_KERNEL_CONTEXT
1151 * Prepend a context field to each event in the channel
1152 * LTTNG_KERNEL_ENABLE
1153 * Enable recording for events in this channel (weak enable)
1154 * LTTNG_KERNEL_DISABLE
1155 * Disable recording for events in this channel (strong disable)
1157 * Channel and event file descriptors also hold a reference on the session.
1160 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1162 struct lttng_channel
*channel
= file
->private_data
;
1165 case LTTNG_KERNEL_OLD_STREAM
:
1166 case LTTNG_KERNEL_STREAM
:
1167 return lttng_abi_open_stream(file
);
1168 case LTTNG_KERNEL_OLD_EVENT
:
1170 struct lttng_kernel_event
*uevent_param
;
1171 struct lttng_kernel_old_event
*old_uevent_param
;
1174 uevent_param
= kmalloc(sizeof(struct lttng_kernel_event
),
1176 if (!uevent_param
) {
1180 old_uevent_param
= kmalloc(
1181 sizeof(struct lttng_kernel_old_event
),
1183 if (!old_uevent_param
) {
1185 goto old_event_error_free_param
;
1187 if (copy_from_user(old_uevent_param
,
1188 (struct lttng_kernel_old_event __user
*) arg
,
1189 sizeof(struct lttng_kernel_old_event
))) {
1191 goto old_event_error_free_old_param
;
1194 memcpy(uevent_param
->name
, old_uevent_param
->name
,
1195 sizeof(uevent_param
->name
));
1196 uevent_param
->instrumentation
=
1197 old_uevent_param
->instrumentation
;
1199 switch (old_uevent_param
->instrumentation
) {
1200 case LTTNG_KERNEL_KPROBE
:
1201 uevent_param
->u
.kprobe
.addr
=
1202 old_uevent_param
->u
.kprobe
.addr
;
1203 uevent_param
->u
.kprobe
.offset
=
1204 old_uevent_param
->u
.kprobe
.offset
;
1205 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
1206 old_uevent_param
->u
.kprobe
.symbol_name
,
1207 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
1209 case LTTNG_KERNEL_KRETPROBE
:
1210 uevent_param
->u
.kretprobe
.addr
=
1211 old_uevent_param
->u
.kretprobe
.addr
;
1212 uevent_param
->u
.kretprobe
.offset
=
1213 old_uevent_param
->u
.kretprobe
.offset
;
1214 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
1215 old_uevent_param
->u
.kretprobe
.symbol_name
,
1216 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
1218 case LTTNG_KERNEL_FUNCTION
:
1219 memcpy(uevent_param
->u
.ftrace
.symbol_name
,
1220 old_uevent_param
->u
.ftrace
.symbol_name
,
1221 sizeof(uevent_param
->u
.ftrace
.symbol_name
));
1226 ret
= lttng_abi_create_event(file
, uevent_param
);
1228 old_event_error_free_old_param
:
1229 kfree(old_uevent_param
);
1230 old_event_error_free_param
:
1231 kfree(uevent_param
);
1235 case LTTNG_KERNEL_EVENT
:
1237 struct lttng_kernel_event uevent_param
;
1239 if (copy_from_user(&uevent_param
,
1240 (struct lttng_kernel_event __user
*) arg
,
1241 sizeof(uevent_param
)))
1243 return lttng_abi_create_event(file
, &uevent_param
);
1245 case LTTNG_KERNEL_OLD_CONTEXT
:
1247 struct lttng_kernel_context
*ucontext_param
;
1248 struct lttng_kernel_old_context
*old_ucontext_param
;
1251 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_context
),
1253 if (!ucontext_param
) {
1257 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_old_context
),
1259 if (!old_ucontext_param
) {
1261 goto old_ctx_error_free_param
;
1264 if (copy_from_user(old_ucontext_param
,
1265 (struct lttng_kernel_old_context __user
*) arg
,
1266 sizeof(struct lttng_kernel_old_context
))) {
1268 goto old_ctx_error_free_old_param
;
1270 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
1271 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
1272 sizeof(ucontext_param
->padding
));
1273 /* only type that uses the union */
1274 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_COUNTER
) {
1275 ucontext_param
->u
.perf_counter
.type
=
1276 old_ucontext_param
->u
.perf_counter
.type
;
1277 ucontext_param
->u
.perf_counter
.config
=
1278 old_ucontext_param
->u
.perf_counter
.config
;
1279 memcpy(ucontext_param
->u
.perf_counter
.name
,
1280 old_ucontext_param
->u
.perf_counter
.name
,
1281 sizeof(ucontext_param
->u
.perf_counter
.name
));
1284 ret
= lttng_abi_add_context(file
,
1286 &channel
->ctx
, channel
->session
);
1288 old_ctx_error_free_old_param
:
1289 kfree(old_ucontext_param
);
1290 old_ctx_error_free_param
:
1291 kfree(ucontext_param
);
1295 case LTTNG_KERNEL_CONTEXT
:
1297 struct lttng_kernel_context ucontext_param
;
1299 if (copy_from_user(&ucontext_param
,
1300 (struct lttng_kernel_context __user
*) arg
,
1301 sizeof(ucontext_param
)))
1303 return lttng_abi_add_context(file
,
1305 &channel
->ctx
, channel
->session
);
1307 case LTTNG_KERNEL_OLD_ENABLE
:
1308 case LTTNG_KERNEL_ENABLE
:
1309 return lttng_channel_enable(channel
);
1310 case LTTNG_KERNEL_OLD_DISABLE
:
1311 case LTTNG_KERNEL_DISABLE
:
1312 return lttng_channel_disable(channel
);
1313 case LTTNG_KERNEL_SYSCALL_MASK
:
1314 return lttng_channel_syscall_mask(channel
,
1315 (struct lttng_kernel_syscall_mask __user
*) arg
);
1317 return -ENOIOCTLCMD
;
1323 * lttng_metadata_ioctl - lttng syscall through ioctl
1329 * This ioctl implements lttng commands:
1330 * LTTNG_KERNEL_STREAM
1331 * Returns an event stream file descriptor or failure.
1333 * Channel and event file descriptors also hold a reference on the session.
1336 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1339 case LTTNG_KERNEL_OLD_STREAM
:
1340 case LTTNG_KERNEL_STREAM
:
1341 return lttng_abi_open_metadata_stream(file
);
1343 return -ENOIOCTLCMD
;
1348 * lttng_channel_poll - lttng stream addition/removal monitoring
1353 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
1355 struct lttng_channel
*channel
= file
->private_data
;
1356 unsigned int mask
= 0;
1358 if (file
->f_mode
& FMODE_READ
) {
1359 poll_wait_set_exclusive(wait
);
1360 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
1363 if (channel
->ops
->is_disabled(channel
->chan
))
1365 if (channel
->ops
->is_finalized(channel
->chan
))
1367 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
1368 return POLLIN
| POLLRDNORM
;
1376 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
1378 struct lttng_channel
*channel
= file
->private_data
;
1381 fput(channel
->session
->file
);
1386 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
1388 struct lttng_channel
*channel
= file
->private_data
;
1391 fput(channel
->session
->file
);
1392 lttng_metadata_channel_destroy(channel
);
1398 static const struct file_operations lttng_channel_fops
= {
1399 .owner
= THIS_MODULE
,
1400 .release
= lttng_channel_release
,
1401 .poll
= lttng_channel_poll
,
1402 .unlocked_ioctl
= lttng_channel_ioctl
,
1403 #ifdef CONFIG_COMPAT
1404 .compat_ioctl
= lttng_channel_ioctl
,
1408 static const struct file_operations lttng_metadata_fops
= {
1409 .owner
= THIS_MODULE
,
1410 .release
= lttng_metadata_channel_release
,
1411 .unlocked_ioctl
= lttng_metadata_ioctl
,
1412 #ifdef CONFIG_COMPAT
1413 .compat_ioctl
= lttng_metadata_ioctl
,
1418 * lttng_event_ioctl - lttng syscall through ioctl
1424 * This ioctl implements lttng commands:
1425 * LTTNG_KERNEL_CONTEXT
1426 * Prepend a context field to each record of this event
1427 * LTTNG_KERNEL_ENABLE
1428 * Enable recording for this event (weak enable)
1429 * LTTNG_KERNEL_DISABLE
1430 * Disable recording for this event (strong disable)
1433 long lttng_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1435 struct lttng_event
*event
;
1436 struct lttng_enabler
*enabler
;
1437 enum lttng_event_type
*evtype
= file
->private_data
;
1440 case LTTNG_KERNEL_OLD_CONTEXT
:
1442 /* Not implemented */
1445 case LTTNG_KERNEL_CONTEXT
:
1447 /* Not implemented */
1450 case LTTNG_KERNEL_OLD_ENABLE
:
1451 case LTTNG_KERNEL_ENABLE
:
1453 case LTTNG_TYPE_EVENT
:
1454 event
= file
->private_data
;
1455 return lttng_event_enable(event
);
1456 case LTTNG_TYPE_ENABLER
:
1457 enabler
= file
->private_data
;
1458 return lttng_enabler_enable(enabler
);
1463 case LTTNG_KERNEL_OLD_DISABLE
:
1464 case LTTNG_KERNEL_DISABLE
:
1466 case LTTNG_TYPE_EVENT
:
1467 event
= file
->private_data
;
1468 return lttng_event_disable(event
);
1469 case LTTNG_TYPE_ENABLER
:
1470 enabler
= file
->private_data
;
1471 return lttng_enabler_disable(enabler
);
1476 case LTTNG_KERNEL_FILTER
:
1478 case LTTNG_TYPE_EVENT
:
1480 case LTTNG_TYPE_ENABLER
:
1482 enabler
= file
->private_data
;
1483 return lttng_enabler_attach_bytecode(enabler
,
1484 (struct lttng_kernel_filter_bytecode __user
*) arg
);
1489 return -ENOIOCTLCMD
;
1494 int lttng_event_release(struct inode
*inode
, struct file
*file
)
1496 struct lttng_event
*event
;
1497 struct lttng_enabler
*enabler
;
1498 enum lttng_event_type
*evtype
= file
->private_data
;
1504 case LTTNG_TYPE_EVENT
:
1505 event
= file
->private_data
;
1507 fput(event
->chan
->file
);
1509 case LTTNG_TYPE_ENABLER
:
1510 enabler
= file
->private_data
;
1512 fput(enabler
->chan
->file
);
1522 /* TODO: filter control ioctl */
1523 static const struct file_operations lttng_event_fops
= {
1524 .owner
= THIS_MODULE
,
1525 .release
= lttng_event_release
,
1526 .unlocked_ioctl
= lttng_event_ioctl
,
1527 #ifdef CONFIG_COMPAT
1528 .compat_ioctl
= lttng_event_ioctl
,
1532 static int put_u64(uint64_t val
, unsigned long arg
)
1534 return put_user(val
, (uint64_t __user
*) arg
);
1537 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
1538 unsigned int cmd
, unsigned long arg
)
1540 struct lib_ring_buffer
*buf
= filp
->private_data
;
1541 struct channel
*chan
= buf
->backend
.chan
;
1542 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1543 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1546 if (atomic_read(&chan
->record_disabled
))
1550 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
1554 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1557 return put_u64(ts
, arg
);
1559 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END
:
1563 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1566 return put_u64(ts
, arg
);
1568 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
:
1572 ret
= ops
->events_discarded(config
, buf
, &ed
);
1575 return put_u64(ed
, arg
);
1577 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE
:
1581 ret
= ops
->content_size(config
, buf
, &cs
);
1584 return put_u64(cs
, arg
);
1586 case LTTNG_RING_BUFFER_GET_PACKET_SIZE
:
1590 ret
= ops
->packet_size(config
, buf
, &ps
);
1593 return put_u64(ps
, arg
);
1595 case LTTNG_RING_BUFFER_GET_STREAM_ID
:
1599 ret
= ops
->stream_id(config
, buf
, &si
);
1602 return put_u64(si
, arg
);
1604 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1608 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1611 return put_u64(ts
, arg
);
1613 case LTTNG_RING_BUFFER_GET_SEQ_NUM
:
1617 ret
= ops
->sequence_number(config
, buf
, &seq
);
1620 return put_u64(seq
, arg
);
1622 case LTTNG_RING_BUFFER_INSTANCE_ID
:
1626 ret
= ops
->instance_id(config
, buf
, &id
);
1629 return put_u64(id
, arg
);
1632 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
1640 #ifdef CONFIG_COMPAT
1641 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
1642 unsigned int cmd
, unsigned long arg
)
1644 struct lib_ring_buffer
*buf
= filp
->private_data
;
1645 struct channel
*chan
= buf
->backend
.chan
;
1646 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1647 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1650 if (atomic_read(&chan
->record_disabled
))
1654 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
1658 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1661 return put_u64(ts
, arg
);
1663 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
1667 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1670 return put_u64(ts
, arg
);
1672 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
1676 ret
= ops
->events_discarded(config
, buf
, &ed
);
1679 return put_u64(ed
, arg
);
1681 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
1685 ret
= ops
->content_size(config
, buf
, &cs
);
1688 return put_u64(cs
, arg
);
1690 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
1694 ret
= ops
->packet_size(config
, buf
, &ps
);
1697 return put_u64(ps
, arg
);
1699 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID
:
1703 ret
= ops
->stream_id(config
, buf
, &si
);
1706 return put_u64(si
, arg
);
1708 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1712 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1715 return put_u64(ts
, arg
);
1717 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
1721 ret
= ops
->sequence_number(config
, buf
, &seq
);
1724 return put_u64(seq
, arg
);
1726 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID
:
1730 ret
= ops
->instance_id(config
, buf
, &id
);
1733 return put_u64(id
, arg
);
1736 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
1743 #endif /* CONFIG_COMPAT */
1745 static void lttng_stream_override_ring_buffer_fops(void)
1747 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
1748 lttng_stream_ring_buffer_file_operations
.open
=
1749 lib_ring_buffer_file_operations
.open
;
1750 lttng_stream_ring_buffer_file_operations
.release
=
1751 lib_ring_buffer_file_operations
.release
;
1752 lttng_stream_ring_buffer_file_operations
.poll
=
1753 lib_ring_buffer_file_operations
.poll
;
1754 lttng_stream_ring_buffer_file_operations
.splice_read
=
1755 lib_ring_buffer_file_operations
.splice_read
;
1756 lttng_stream_ring_buffer_file_operations
.mmap
=
1757 lib_ring_buffer_file_operations
.mmap
;
1758 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
1759 lttng_stream_ring_buffer_ioctl
;
1760 lttng_stream_ring_buffer_file_operations
.llseek
=
1761 lib_ring_buffer_file_operations
.llseek
;
1762 #ifdef CONFIG_COMPAT
1763 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
1764 lttng_stream_ring_buffer_compat_ioctl
;
1768 int __init
lttng_abi_init(void)
1772 wrapper_vmalloc_sync_all();
1774 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
1777 if (!lttng_proc_dentry
) {
1778 printk(KERN_ERR
"Error creating LTTng control file\n");
1782 lttng_stream_override_ring_buffer_fops();
1786 lttng_clock_unref();
1790 /* No __exit annotation because used by init error path too. */
1791 void lttng_abi_exit(void)
1793 lttng_clock_unref();
1794 if (lttng_proc_dentry
)
1795 remove_proc_entry("lttng", NULL
);