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
;
557 case LTTNG_KERNEL_OLD_CHANNEL
:
559 struct lttng_kernel_channel chan_param
;
560 struct lttng_kernel_old_channel old_chan_param
;
562 if (copy_from_user(&old_chan_param
,
563 (struct lttng_kernel_old_channel __user
*) arg
,
564 sizeof(struct lttng_kernel_old_channel
)))
566 chan_param
.overwrite
= old_chan_param
.overwrite
;
567 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
568 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
569 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
570 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
571 chan_param
.output
= old_chan_param
.output
;
573 return lttng_abi_create_channel(file
, &chan_param
,
576 case LTTNG_KERNEL_CHANNEL
:
578 struct lttng_kernel_channel chan_param
;
580 if (copy_from_user(&chan_param
,
581 (struct lttng_kernel_channel __user
*) arg
,
582 sizeof(struct lttng_kernel_channel
)))
584 return lttng_abi_create_channel(file
, &chan_param
,
587 case LTTNG_KERNEL_OLD_SESSION_START
:
588 case LTTNG_KERNEL_OLD_ENABLE
:
589 case LTTNG_KERNEL_SESSION_START
:
590 case LTTNG_KERNEL_ENABLE
:
591 return lttng_session_enable(session
);
592 case LTTNG_KERNEL_OLD_SESSION_STOP
:
593 case LTTNG_KERNEL_OLD_DISABLE
:
594 case LTTNG_KERNEL_SESSION_STOP
:
595 case LTTNG_KERNEL_DISABLE
:
596 return lttng_session_disable(session
);
597 case LTTNG_KERNEL_OLD_METADATA
:
599 struct lttng_kernel_channel chan_param
;
600 struct lttng_kernel_old_channel old_chan_param
;
602 if (copy_from_user(&old_chan_param
,
603 (struct lttng_kernel_old_channel __user
*) arg
,
604 sizeof(struct lttng_kernel_old_channel
)))
606 chan_param
.overwrite
= old_chan_param
.overwrite
;
607 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
608 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
609 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
610 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
611 chan_param
.output
= old_chan_param
.output
;
613 return lttng_abi_create_channel(file
, &chan_param
,
616 case LTTNG_KERNEL_METADATA
:
618 struct lttng_kernel_channel chan_param
;
620 if (copy_from_user(&chan_param
,
621 (struct lttng_kernel_channel __user
*) arg
,
622 sizeof(struct lttng_kernel_channel
)))
624 return lttng_abi_create_channel(file
, &chan_param
,
627 case LTTNG_KERNEL_SESSION_TRACK_PID
:
628 return lttng_session_track_pid(session
, (int) arg
);
629 case LTTNG_KERNEL_SESSION_UNTRACK_PID
:
630 return lttng_session_untrack_pid(session
, (int) arg
);
631 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
:
632 return lttng_session_list_tracker_pids(session
);
633 case LTTNG_KERNEL_SESSION_METADATA_REGEN
:
634 return lttng_session_metadata_regenerate(session
);
635 case LTTNG_KERNEL_SESSION_STATEDUMP
:
636 return lttng_session_statedump(session
);
637 case LTTNG_KERNEL_SESSION_SET_NAME
:
639 struct lttng_kernel_session_name name
;
641 if (copy_from_user(&name
,
642 (struct lttng_kernel_session_name __user
*) arg
,
643 sizeof(struct lttng_kernel_session_name
)))
645 return lttng_abi_session_set_name(session
, &name
);
647 case LTTNG_KERNEL_SESSION_SET_CREATION_TIME
:
649 struct lttng_kernel_session_creation_time time
;
651 if (copy_from_user(&time
,
652 (struct lttng_kernel_session_creation_time __user
*) arg
,
653 sizeof(struct lttng_kernel_session_creation_time
)))
655 return lttng_abi_session_set_creation_time(session
, &time
);
663 * Called when the last file reference is dropped.
665 * Big fat note: channels and events are invariant for the whole session after
666 * their creation. So this session destruction also destroys all channel and
667 * event structures specific to this session (they are not destroyed when their
668 * individual file is released).
671 int lttng_session_release(struct inode
*inode
, struct file
*file
)
673 struct lttng_session
*session
= file
->private_data
;
676 lttng_session_destroy(session
);
680 static const struct file_operations lttng_session_fops
= {
681 .owner
= THIS_MODULE
,
682 .release
= lttng_session_release
,
683 .unlocked_ioctl
= lttng_session_ioctl
,
685 .compat_ioctl
= lttng_session_ioctl
,
690 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
694 * Handles the poll operations for the metadata channels.
697 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
700 struct lttng_metadata_stream
*stream
= filp
->private_data
;
701 struct lib_ring_buffer
*buf
= stream
->priv
;
703 unsigned int mask
= 0;
705 if (filp
->f_mode
& FMODE_READ
) {
706 poll_wait_set_exclusive(wait
);
707 poll_wait(filp
, &stream
->read_wait
, wait
);
709 finalized
= stream
->finalized
;
712 * lib_ring_buffer_is_finalized() contains a smp_rmb()
713 * ordering finalized load before offsets loads.
715 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
720 mutex_lock(&stream
->metadata_cache
->lock
);
721 if (stream
->metadata_cache
->metadata_written
>
722 stream
->metadata_out
)
724 mutex_unlock(&stream
->metadata_cache
->lock
);
731 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
732 unsigned int cmd
, unsigned long arg
)
734 struct lttng_metadata_stream
*stream
= filp
->private_data
;
736 stream
->metadata_out
= stream
->metadata_in
;
740 * Reset the counter of how much metadata has been consumed to 0. That way,
741 * the consumer receives the content of the metadata cache unchanged. This is
742 * different from the metadata_regenerate where the offset from epoch is
743 * resampled, here we want the exact same content as the last time the metadata
744 * was generated. This command is only possible if all the metadata written
745 * in the cache has been output to the metadata stream to avoid corrupting the
748 * Return 0 on success, a negative value on error.
751 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
754 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
756 mutex_lock(&cache
->lock
);
757 if (stream
->metadata_out
!= cache
->metadata_written
) {
761 stream
->metadata_out
= 0;
762 stream
->metadata_in
= 0;
763 wake_up_interruptible(&stream
->read_wait
);
767 mutex_unlock(&cache
->lock
);
772 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
773 unsigned int cmd
, unsigned long arg
)
776 struct lttng_metadata_stream
*stream
= filp
->private_data
;
777 struct lib_ring_buffer
*buf
= stream
->priv
;
780 case RING_BUFFER_GET_NEXT_SUBBUF
:
782 struct lttng_metadata_stream
*stream
= filp
->private_data
;
783 struct lib_ring_buffer
*buf
= stream
->priv
;
784 struct channel
*chan
= buf
->backend
.chan
;
786 ret
= lttng_metadata_output_channel(stream
, chan
);
788 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
794 case RING_BUFFER_GET_SUBBUF
:
797 * Random access is not allowed for metadata channel.
801 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
802 case RING_BUFFER_FLUSH
:
804 struct lttng_metadata_stream
*stream
= filp
->private_data
;
805 struct lib_ring_buffer
*buf
= stream
->priv
;
806 struct channel
*chan
= buf
->backend
.chan
;
809 * Before doing the actual ring buffer flush, write up to one
810 * packet of metadata in the ring buffer.
812 ret
= lttng_metadata_output_channel(stream
, chan
);
817 case RING_BUFFER_GET_METADATA_VERSION
:
819 struct lttng_metadata_stream
*stream
= filp
->private_data
;
821 return put_u64(stream
->version
, arg
);
823 case RING_BUFFER_METADATA_CACHE_DUMP
:
825 struct lttng_metadata_stream
*stream
= filp
->private_data
;
827 return lttng_metadata_cache_dump(stream
);
832 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
834 /* Performing lib ring buffer ioctl after our own. */
835 ret
= lib_ring_buffer_ioctl(filp
, cmd
, arg
, buf
);
840 case RING_BUFFER_PUT_NEXT_SUBBUF
:
842 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
855 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
856 unsigned int cmd
, unsigned long arg
)
859 struct lttng_metadata_stream
*stream
= filp
->private_data
;
860 struct lib_ring_buffer
*buf
= stream
->priv
;
863 case RING_BUFFER_GET_NEXT_SUBBUF
:
865 struct lttng_metadata_stream
*stream
= filp
->private_data
;
866 struct lib_ring_buffer
*buf
= stream
->priv
;
867 struct channel
*chan
= buf
->backend
.chan
;
869 ret
= lttng_metadata_output_channel(stream
, chan
);
871 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
877 case RING_BUFFER_GET_SUBBUF
:
880 * Random access is not allowed for metadata channel.
884 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
885 case RING_BUFFER_FLUSH
:
887 struct lttng_metadata_stream
*stream
= filp
->private_data
;
888 struct lib_ring_buffer
*buf
= stream
->priv
;
889 struct channel
*chan
= buf
->backend
.chan
;
892 * Before doing the actual ring buffer flush, write up to one
893 * packet of metadata in the ring buffer.
895 ret
= lttng_metadata_output_channel(stream
, chan
);
900 case RING_BUFFER_GET_METADATA_VERSION
:
902 struct lttng_metadata_stream
*stream
= filp
->private_data
;
904 return put_u64(stream
->version
, arg
);
906 case RING_BUFFER_METADATA_CACHE_DUMP
:
908 struct lttng_metadata_stream
*stream
= filp
->private_data
;
910 return lttng_metadata_cache_dump(stream
);
915 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
917 /* Performing lib ring buffer ioctl after our own. */
918 ret
= lib_ring_buffer_compat_ioctl(filp
, cmd
, arg
, buf
);
923 case RING_BUFFER_PUT_NEXT_SUBBUF
:
925 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
938 * This is not used by anonymous file descriptors. This code is left
939 * there if we ever want to implement an inode with open() operation.
942 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
944 struct lttng_metadata_stream
*stream
= inode
->i_private
;
945 struct lib_ring_buffer
*buf
= stream
->priv
;
947 file
->private_data
= buf
;
949 * Since life-time of metadata cache differs from that of
950 * session, we need to keep our own reference on the transport.
952 if (!try_module_get(stream
->transport
->owner
)) {
953 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
956 return lib_ring_buffer_open(inode
, file
, buf
);
960 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
962 struct lttng_metadata_stream
*stream
= file
->private_data
;
963 struct lib_ring_buffer
*buf
= stream
->priv
;
965 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
966 module_put(stream
->transport
->owner
);
967 return lib_ring_buffer_release(inode
, file
, buf
);
971 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
972 struct pipe_inode_info
*pipe
, size_t len
,
975 struct lttng_metadata_stream
*stream
= in
->private_data
;
976 struct lib_ring_buffer
*buf
= stream
->priv
;
978 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
983 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
984 struct vm_area_struct
*vma
)
986 struct lttng_metadata_stream
*stream
= filp
->private_data
;
987 struct lib_ring_buffer
*buf
= stream
->priv
;
989 return lib_ring_buffer_mmap(filp
, vma
, buf
);
993 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
994 .owner
= THIS_MODULE
,
995 .open
= lttng_metadata_ring_buffer_open
,
996 .release
= lttng_metadata_ring_buffer_release
,
997 .poll
= lttng_metadata_ring_buffer_poll
,
998 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
999 .mmap
= lttng_metadata_ring_buffer_mmap
,
1000 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
1001 .llseek
= vfs_lib_ring_buffer_no_llseek
,
1002 #ifdef CONFIG_COMPAT
1003 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
1008 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
1009 const struct file_operations
*fops
)
1012 struct file
*stream_file
;
1014 stream_fd
= lttng_get_unused_fd();
1015 if (stream_fd
< 0) {
1019 stream_file
= anon_inode_getfile("[lttng_stream]", fops
,
1020 stream_priv
, O_RDWR
);
1021 if (IS_ERR(stream_file
)) {
1022 ret
= PTR_ERR(stream_file
);
1026 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1027 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1028 * file descriptor, so we set FMODE_PREAD here.
1030 stream_file
->f_mode
|= FMODE_PREAD
;
1031 fd_install(stream_fd
, stream_file
);
1033 * The stream holds a reference to the channel within the generic ring
1034 * buffer library, so no need to hold a refcount on the channel and
1035 * session files here.
1040 put_unused_fd(stream_fd
);
1046 int lttng_abi_open_stream(struct file
*channel_file
)
1048 struct lttng_channel
*channel
= channel_file
->private_data
;
1049 struct lib_ring_buffer
*buf
;
1053 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1058 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1059 <tng_stream_ring_buffer_file_operations
);
1066 channel
->ops
->buffer_read_close(buf
);
1071 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
1073 struct lttng_channel
*channel
= channel_file
->private_data
;
1074 struct lttng_session
*session
= channel
->session
;
1075 struct lib_ring_buffer
*buf
;
1077 struct lttng_metadata_stream
*metadata_stream
;
1080 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1084 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1086 if (!metadata_stream
) {
1090 metadata_stream
->metadata_cache
= session
->metadata_cache
;
1091 init_waitqueue_head(&metadata_stream
->read_wait
);
1092 metadata_stream
->priv
= buf
;
1093 stream_priv
= metadata_stream
;
1094 metadata_stream
->transport
= channel
->transport
;
1097 * Since life-time of metadata cache differs from that of
1098 * session, we need to keep our own reference on the transport.
1100 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1101 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1106 if (!lttng_kref_get(&session
->metadata_cache
->refcount
)) {
1111 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1112 <tng_metadata_ring_buffer_file_operations
);
1116 list_add(&metadata_stream
->list
,
1117 &session
->metadata_cache
->metadata_stream
);
1121 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
1123 module_put(metadata_stream
->transport
->owner
);
1125 kfree(metadata_stream
);
1127 channel
->ops
->buffer_read_close(buf
);
1132 int lttng_abi_create_event(struct file
*channel_file
,
1133 struct lttng_kernel_event
*event_param
)
1135 struct lttng_channel
*channel
= channel_file
->private_data
;
1137 struct file
*event_file
;
1140 event_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1141 switch (event_param
->instrumentation
) {
1142 case LTTNG_KERNEL_KRETPROBE
:
1143 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1145 case LTTNG_KERNEL_KPROBE
:
1146 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1148 case LTTNG_KERNEL_FUNCTION
:
1149 event_param
->u
.ftrace
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1154 event_fd
= lttng_get_unused_fd();
1159 event_file
= anon_inode_getfile("[lttng_event]",
1162 if (IS_ERR(event_file
)) {
1163 ret
= PTR_ERR(event_file
);
1166 /* The event holds a reference on the channel */
1167 if (!atomic_long_add_unless(&channel_file
->f_count
, 1, LONG_MAX
)) {
1169 goto refcount_error
;
1171 if (event_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1172 || event_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1173 struct lttng_enabler
*enabler
;
1175 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1177 * If the event name is a star globbing pattern,
1178 * we create the special star globbing enabler.
1180 enabler
= lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB
,
1181 event_param
, channel
);
1183 enabler
= lttng_enabler_create(LTTNG_ENABLER_NAME
,
1184 event_param
, channel
);
1188 struct lttng_event
*event
;
1191 * We tolerate no failure path after event creation. It
1192 * will stay invariant for the rest of the session.
1194 event
= lttng_event_create(channel
, event_param
,
1196 event_param
->instrumentation
);
1197 WARN_ON_ONCE(!event
);
1198 if (IS_ERR(event
)) {
1199 ret
= PTR_ERR(event
);
1204 event_file
->private_data
= priv
;
1205 fd_install(event_fd
, event_file
);
1209 atomic_long_dec(&channel_file
->f_count
);
1213 put_unused_fd(event_fd
);
1219 * lttng_channel_ioctl - lttng syscall through ioctl
1225 * This ioctl implements lttng commands:
1226 * LTTNG_KERNEL_STREAM
1227 * Returns an event stream file descriptor or failure.
1228 * (typically, one event stream records events from one CPU)
1229 * LTTNG_KERNEL_EVENT
1230 * Returns an event file descriptor or failure.
1231 * LTTNG_KERNEL_CONTEXT
1232 * Prepend a context field to each event in the channel
1233 * LTTNG_KERNEL_ENABLE
1234 * Enable recording for events in this channel (weak enable)
1235 * LTTNG_KERNEL_DISABLE
1236 * Disable recording for events in this channel (strong disable)
1238 * Channel and event file descriptors also hold a reference on the session.
1241 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1243 struct lttng_channel
*channel
= file
->private_data
;
1246 case LTTNG_KERNEL_OLD_STREAM
:
1247 case LTTNG_KERNEL_STREAM
:
1248 return lttng_abi_open_stream(file
);
1249 case LTTNG_KERNEL_OLD_EVENT
:
1251 struct lttng_kernel_event
*uevent_param
;
1252 struct lttng_kernel_old_event
*old_uevent_param
;
1255 uevent_param
= kmalloc(sizeof(struct lttng_kernel_event
),
1257 if (!uevent_param
) {
1261 old_uevent_param
= kmalloc(
1262 sizeof(struct lttng_kernel_old_event
),
1264 if (!old_uevent_param
) {
1266 goto old_event_error_free_param
;
1268 if (copy_from_user(old_uevent_param
,
1269 (struct lttng_kernel_old_event __user
*) arg
,
1270 sizeof(struct lttng_kernel_old_event
))) {
1272 goto old_event_error_free_old_param
;
1275 memcpy(uevent_param
->name
, old_uevent_param
->name
,
1276 sizeof(uevent_param
->name
));
1277 uevent_param
->instrumentation
=
1278 old_uevent_param
->instrumentation
;
1280 switch (old_uevent_param
->instrumentation
) {
1281 case LTTNG_KERNEL_KPROBE
:
1282 uevent_param
->u
.kprobe
.addr
=
1283 old_uevent_param
->u
.kprobe
.addr
;
1284 uevent_param
->u
.kprobe
.offset
=
1285 old_uevent_param
->u
.kprobe
.offset
;
1286 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
1287 old_uevent_param
->u
.kprobe
.symbol_name
,
1288 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
1290 case LTTNG_KERNEL_KRETPROBE
:
1291 uevent_param
->u
.kretprobe
.addr
=
1292 old_uevent_param
->u
.kretprobe
.addr
;
1293 uevent_param
->u
.kretprobe
.offset
=
1294 old_uevent_param
->u
.kretprobe
.offset
;
1295 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
1296 old_uevent_param
->u
.kretprobe
.symbol_name
,
1297 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
1299 case LTTNG_KERNEL_FUNCTION
:
1300 memcpy(uevent_param
->u
.ftrace
.symbol_name
,
1301 old_uevent_param
->u
.ftrace
.symbol_name
,
1302 sizeof(uevent_param
->u
.ftrace
.symbol_name
));
1307 ret
= lttng_abi_create_event(file
, uevent_param
);
1309 old_event_error_free_old_param
:
1310 kfree(old_uevent_param
);
1311 old_event_error_free_param
:
1312 kfree(uevent_param
);
1316 case LTTNG_KERNEL_EVENT
:
1318 struct lttng_kernel_event uevent_param
;
1320 if (copy_from_user(&uevent_param
,
1321 (struct lttng_kernel_event __user
*) arg
,
1322 sizeof(uevent_param
)))
1324 return lttng_abi_create_event(file
, &uevent_param
);
1326 case LTTNG_KERNEL_OLD_CONTEXT
:
1328 struct lttng_kernel_context
*ucontext_param
;
1329 struct lttng_kernel_old_context
*old_ucontext_param
;
1332 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_context
),
1334 if (!ucontext_param
) {
1338 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_old_context
),
1340 if (!old_ucontext_param
) {
1342 goto old_ctx_error_free_param
;
1345 if (copy_from_user(old_ucontext_param
,
1346 (struct lttng_kernel_old_context __user
*) arg
,
1347 sizeof(struct lttng_kernel_old_context
))) {
1349 goto old_ctx_error_free_old_param
;
1351 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
1352 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
1353 sizeof(ucontext_param
->padding
));
1354 /* only type that uses the union */
1355 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_COUNTER
) {
1356 ucontext_param
->u
.perf_counter
.type
=
1357 old_ucontext_param
->u
.perf_counter
.type
;
1358 ucontext_param
->u
.perf_counter
.config
=
1359 old_ucontext_param
->u
.perf_counter
.config
;
1360 memcpy(ucontext_param
->u
.perf_counter
.name
,
1361 old_ucontext_param
->u
.perf_counter
.name
,
1362 sizeof(ucontext_param
->u
.perf_counter
.name
));
1365 ret
= lttng_abi_add_context(file
,
1367 &channel
->ctx
, channel
->session
);
1369 old_ctx_error_free_old_param
:
1370 kfree(old_ucontext_param
);
1371 old_ctx_error_free_param
:
1372 kfree(ucontext_param
);
1376 case LTTNG_KERNEL_CONTEXT
:
1378 struct lttng_kernel_context ucontext_param
;
1380 if (copy_from_user(&ucontext_param
,
1381 (struct lttng_kernel_context __user
*) arg
,
1382 sizeof(ucontext_param
)))
1384 return lttng_abi_add_context(file
,
1386 &channel
->ctx
, channel
->session
);
1388 case LTTNG_KERNEL_OLD_ENABLE
:
1389 case LTTNG_KERNEL_ENABLE
:
1390 return lttng_channel_enable(channel
);
1391 case LTTNG_KERNEL_OLD_DISABLE
:
1392 case LTTNG_KERNEL_DISABLE
:
1393 return lttng_channel_disable(channel
);
1394 case LTTNG_KERNEL_SYSCALL_MASK
:
1395 return lttng_channel_syscall_mask(channel
,
1396 (struct lttng_kernel_syscall_mask __user
*) arg
);
1398 return -ENOIOCTLCMD
;
1403 * lttng_metadata_ioctl - lttng syscall through ioctl
1409 * This ioctl implements lttng commands:
1410 * LTTNG_KERNEL_STREAM
1411 * Returns an event stream file descriptor or failure.
1413 * Channel and event file descriptors also hold a reference on the session.
1416 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1419 case LTTNG_KERNEL_OLD_STREAM
:
1420 case LTTNG_KERNEL_STREAM
:
1421 return lttng_abi_open_metadata_stream(file
);
1423 return -ENOIOCTLCMD
;
1428 * lttng_channel_poll - lttng stream addition/removal monitoring
1433 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
1435 struct lttng_channel
*channel
= file
->private_data
;
1436 unsigned int mask
= 0;
1438 if (file
->f_mode
& FMODE_READ
) {
1439 poll_wait_set_exclusive(wait
);
1440 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
1443 if (channel
->ops
->is_disabled(channel
->chan
))
1445 if (channel
->ops
->is_finalized(channel
->chan
))
1447 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
1448 return POLLIN
| POLLRDNORM
;
1456 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
1458 struct lttng_channel
*channel
= file
->private_data
;
1461 fput(channel
->session
->file
);
1466 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
1468 struct lttng_channel
*channel
= file
->private_data
;
1471 fput(channel
->session
->file
);
1472 lttng_metadata_channel_destroy(channel
);
1478 static const struct file_operations lttng_channel_fops
= {
1479 .owner
= THIS_MODULE
,
1480 .release
= lttng_channel_release
,
1481 .poll
= lttng_channel_poll
,
1482 .unlocked_ioctl
= lttng_channel_ioctl
,
1483 #ifdef CONFIG_COMPAT
1484 .compat_ioctl
= lttng_channel_ioctl
,
1488 static const struct file_operations lttng_metadata_fops
= {
1489 .owner
= THIS_MODULE
,
1490 .release
= lttng_metadata_channel_release
,
1491 .unlocked_ioctl
= lttng_metadata_ioctl
,
1492 #ifdef CONFIG_COMPAT
1493 .compat_ioctl
= lttng_metadata_ioctl
,
1498 * lttng_event_ioctl - lttng syscall through ioctl
1504 * This ioctl implements lttng commands:
1505 * LTTNG_KERNEL_CONTEXT
1506 * Prepend a context field to each record of this event
1507 * LTTNG_KERNEL_ENABLE
1508 * Enable recording for this event (weak enable)
1509 * LTTNG_KERNEL_DISABLE
1510 * Disable recording for this event (strong disable)
1513 long lttng_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1515 struct lttng_event
*event
;
1516 struct lttng_enabler
*enabler
;
1517 enum lttng_event_type
*evtype
= file
->private_data
;
1520 case LTTNG_KERNEL_OLD_CONTEXT
:
1522 /* Not implemented */
1525 case LTTNG_KERNEL_CONTEXT
:
1527 /* Not implemented */
1530 case LTTNG_KERNEL_OLD_ENABLE
:
1531 case LTTNG_KERNEL_ENABLE
:
1533 case LTTNG_TYPE_EVENT
:
1534 event
= file
->private_data
;
1535 return lttng_event_enable(event
);
1536 case LTTNG_TYPE_ENABLER
:
1537 enabler
= file
->private_data
;
1538 return lttng_enabler_enable(enabler
);
1543 case LTTNG_KERNEL_OLD_DISABLE
:
1544 case LTTNG_KERNEL_DISABLE
:
1546 case LTTNG_TYPE_EVENT
:
1547 event
= file
->private_data
;
1548 return lttng_event_disable(event
);
1549 case LTTNG_TYPE_ENABLER
:
1550 enabler
= file
->private_data
;
1551 return lttng_enabler_disable(enabler
);
1556 case LTTNG_KERNEL_FILTER
:
1558 case LTTNG_TYPE_EVENT
:
1560 case LTTNG_TYPE_ENABLER
:
1562 enabler
= file
->private_data
;
1563 return lttng_enabler_attach_bytecode(enabler
,
1564 (struct lttng_kernel_filter_bytecode __user
*) arg
);
1570 case LTTNG_KERNEL_ADD_CALLSITE
:
1572 case LTTNG_TYPE_EVENT
:
1573 event
= file
->private_data
;
1574 return lttng_event_add_callsite(event
,
1575 (struct lttng_kernel_event_callsite __user
*) arg
);
1576 case LTTNG_TYPE_ENABLER
:
1580 return -ENOIOCTLCMD
;
1585 int lttng_event_release(struct inode
*inode
, struct file
*file
)
1587 struct lttng_event
*event
;
1588 struct lttng_enabler
*enabler
;
1589 enum lttng_event_type
*evtype
= file
->private_data
;
1595 case LTTNG_TYPE_EVENT
:
1596 event
= file
->private_data
;
1598 fput(event
->chan
->file
);
1600 case LTTNG_TYPE_ENABLER
:
1601 enabler
= file
->private_data
;
1603 fput(enabler
->chan
->file
);
1613 /* TODO: filter control ioctl */
1614 static const struct file_operations lttng_event_fops
= {
1615 .owner
= THIS_MODULE
,
1616 .release
= lttng_event_release
,
1617 .unlocked_ioctl
= lttng_event_ioctl
,
1618 #ifdef CONFIG_COMPAT
1619 .compat_ioctl
= lttng_event_ioctl
,
1623 static int put_u64(uint64_t val
, unsigned long arg
)
1625 return put_user(val
, (uint64_t __user
*) arg
);
1628 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
1629 unsigned int cmd
, unsigned long arg
)
1631 struct lib_ring_buffer
*buf
= filp
->private_data
;
1632 struct channel
*chan
= buf
->backend
.chan
;
1633 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1634 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1637 if (atomic_read(&chan
->record_disabled
))
1641 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
1645 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1648 return put_u64(ts
, arg
);
1650 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END
:
1654 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1657 return put_u64(ts
, arg
);
1659 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
:
1663 ret
= ops
->events_discarded(config
, buf
, &ed
);
1666 return put_u64(ed
, arg
);
1668 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE
:
1672 ret
= ops
->content_size(config
, buf
, &cs
);
1675 return put_u64(cs
, arg
);
1677 case LTTNG_RING_BUFFER_GET_PACKET_SIZE
:
1681 ret
= ops
->packet_size(config
, buf
, &ps
);
1684 return put_u64(ps
, arg
);
1686 case LTTNG_RING_BUFFER_GET_STREAM_ID
:
1690 ret
= ops
->stream_id(config
, buf
, &si
);
1693 return put_u64(si
, arg
);
1695 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1699 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1702 return put_u64(ts
, arg
);
1704 case LTTNG_RING_BUFFER_GET_SEQ_NUM
:
1708 ret
= ops
->sequence_number(config
, buf
, &seq
);
1711 return put_u64(seq
, arg
);
1713 case LTTNG_RING_BUFFER_INSTANCE_ID
:
1717 ret
= ops
->instance_id(config
, buf
, &id
);
1720 return put_u64(id
, arg
);
1723 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
1731 #ifdef CONFIG_COMPAT
1732 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
1733 unsigned int cmd
, unsigned long arg
)
1735 struct lib_ring_buffer
*buf
= filp
->private_data
;
1736 struct channel
*chan
= buf
->backend
.chan
;
1737 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1738 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1741 if (atomic_read(&chan
->record_disabled
))
1745 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
1749 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1752 return put_u64(ts
, arg
);
1754 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
1758 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1761 return put_u64(ts
, arg
);
1763 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
1767 ret
= ops
->events_discarded(config
, buf
, &ed
);
1770 return put_u64(ed
, arg
);
1772 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
1776 ret
= ops
->content_size(config
, buf
, &cs
);
1779 return put_u64(cs
, arg
);
1781 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
1785 ret
= ops
->packet_size(config
, buf
, &ps
);
1788 return put_u64(ps
, arg
);
1790 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID
:
1794 ret
= ops
->stream_id(config
, buf
, &si
);
1797 return put_u64(si
, arg
);
1799 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1803 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1806 return put_u64(ts
, arg
);
1808 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
1812 ret
= ops
->sequence_number(config
, buf
, &seq
);
1815 return put_u64(seq
, arg
);
1817 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID
:
1821 ret
= ops
->instance_id(config
, buf
, &id
);
1824 return put_u64(id
, arg
);
1827 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
1834 #endif /* CONFIG_COMPAT */
1836 static void lttng_stream_override_ring_buffer_fops(void)
1838 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
1839 lttng_stream_ring_buffer_file_operations
.open
=
1840 lib_ring_buffer_file_operations
.open
;
1841 lttng_stream_ring_buffer_file_operations
.release
=
1842 lib_ring_buffer_file_operations
.release
;
1843 lttng_stream_ring_buffer_file_operations
.poll
=
1844 lib_ring_buffer_file_operations
.poll
;
1845 lttng_stream_ring_buffer_file_operations
.splice_read
=
1846 lib_ring_buffer_file_operations
.splice_read
;
1847 lttng_stream_ring_buffer_file_operations
.mmap
=
1848 lib_ring_buffer_file_operations
.mmap
;
1849 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
1850 lttng_stream_ring_buffer_ioctl
;
1851 lttng_stream_ring_buffer_file_operations
.llseek
=
1852 lib_ring_buffer_file_operations
.llseek
;
1853 #ifdef CONFIG_COMPAT
1854 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
1855 lttng_stream_ring_buffer_compat_ioctl
;
1859 int __init
lttng_abi_init(void)
1863 wrapper_vmalloc_sync_all();
1866 ret
= lttng_tp_mempool_init();
1871 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
1874 if (!lttng_proc_dentry
) {
1875 printk(KERN_ERR
"Error creating LTTng control file\n");
1879 lttng_stream_override_ring_buffer_fops();
1883 lttng_tp_mempool_destroy();
1884 lttng_clock_unref();
1888 /* No __exit annotation because used by init error path too. */
1889 void lttng_abi_exit(void)
1891 lttng_tp_mempool_destroy();
1892 lttng_clock_unref();
1893 if (lttng_proc_dentry
)
1894 remove_proc_entry("lttng", NULL
);