1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
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_mappings() */
34 #include <ringbuffer/vfs.h>
35 #include <ringbuffer/backend.h>
36 #include <ringbuffer/frontend.h>
37 #include <wrapper/compiler_attributes.h>
38 #include <wrapper/poll.h>
39 #include <wrapper/file.h>
40 #include <wrapper/kref.h>
41 #include <wrapper/barrier.h>
42 #include <lttng/string-utils.h>
43 #include <lttng/abi.h>
44 #include <lttng/abi-old.h>
45 #include <lttng/events.h>
46 #include <lttng/events-internal.h>
47 #include <lttng/tracer.h>
48 #include <lttng/tp-mempool.h>
49 #include <ringbuffer/frontend_types.h>
50 #include <ringbuffer/iterator.h>
53 * This is LTTng's own personal way to create a system call as an external
54 * module. We use ioctl() on /proc/lttng.
57 static struct proc_dir_entry
*lttng_proc_dentry
;
59 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
60 static const struct proc_ops lttng_proc_ops
;
62 static const struct file_operations lttng_proc_ops
;
65 static const struct file_operations lttng_session_fops
;
66 static const struct file_operations lttng_event_notifier_group_fops
;
67 static const struct file_operations lttng_channel_fops
;
68 static const struct file_operations lttng_metadata_fops
;
69 static const struct file_operations lttng_event_recorder_event_fops
;
70 static const struct file_operations lttng_event_recorder_enabler_fops
;
71 static struct file_operations lttng_stream_ring_buffer_file_operations
;
73 static int put_u64(uint64_t val
, unsigned long arg
);
74 static int put_u32(uint32_t val
, unsigned long arg
);
76 static int validate_zeroed_padding(char *p
, size_t len
)
80 for (i
= 0; i
< len
; i
++) {
88 * Teardown management: opened file descriptors keep a refcount on the module,
89 * so it can only exit when all file descriptors are closed.
93 int lttng_abi_create_session(void)
95 struct lttng_kernel_session
*session
;
96 struct file
*session_file
;
99 session
= lttng_session_create();
102 session_fd
= lttng_get_unused_fd();
103 if (session_fd
< 0) {
107 session_file
= anon_inode_getfile("[lttng_session]",
110 if (IS_ERR(session_file
)) {
111 ret
= PTR_ERR(session_file
);
114 session
->priv
->file
= session_file
;
115 fd_install(session_fd
, session_file
);
119 put_unused_fd(session_fd
);
121 lttng_session_destroy(session
);
125 void event_notifier_send_notification_work_wakeup(struct irq_work
*entry
)
127 struct lttng_event_notifier_group
*event_notifier_group
=
128 container_of(entry
, struct lttng_event_notifier_group
,
130 wake_up_interruptible(&event_notifier_group
->read_wait
);
134 int lttng_abi_create_event_notifier_group(void)
136 struct lttng_event_notifier_group
*event_notifier_group
;
137 struct file
*event_notifier_group_file
;
138 int event_notifier_group_fd
, ret
;
140 event_notifier_group
= lttng_event_notifier_group_create();
141 if (!event_notifier_group
)
144 event_notifier_group_fd
= lttng_get_unused_fd();
145 if (event_notifier_group_fd
< 0) {
146 ret
= event_notifier_group_fd
;
149 event_notifier_group_file
= anon_inode_getfile("[lttng_event_notifier_group]",
150 <tng_event_notifier_group_fops
,
151 event_notifier_group
, O_RDWR
);
152 if (IS_ERR(event_notifier_group_file
)) {
153 ret
= PTR_ERR(event_notifier_group_file
);
157 event_notifier_group
->file
= event_notifier_group_file
;
158 init_waitqueue_head(&event_notifier_group
->read_wait
);
159 init_irq_work(&event_notifier_group
->wakeup_pending
,
160 event_notifier_send_notification_work_wakeup
);
161 fd_install(event_notifier_group_fd
, event_notifier_group_file
);
162 return event_notifier_group_fd
;
165 put_unused_fd(event_notifier_group_fd
);
167 lttng_event_notifier_group_destroy(event_notifier_group
);
172 int lttng_abi_tracepoint_list(void)
174 struct file
*tracepoint_list_file
;
177 file_fd
= lttng_get_unused_fd();
183 tracepoint_list_file
= anon_inode_getfile("[lttng_tracepoint_list]",
184 <tng_tracepoint_list_fops
,
186 if (IS_ERR(tracepoint_list_file
)) {
187 ret
= PTR_ERR(tracepoint_list_file
);
190 ret
= lttng_tracepoint_list_fops
.open(NULL
, tracepoint_list_file
);
193 fd_install(file_fd
, tracepoint_list_file
);
197 fput(tracepoint_list_file
);
199 put_unused_fd(file_fd
);
204 #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
206 int lttng_abi_syscall_list(void)
212 int lttng_abi_syscall_list(void)
214 struct file
*syscall_list_file
;
217 file_fd
= lttng_get_unused_fd();
223 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
224 <tng_syscall_list_fops
,
226 if (IS_ERR(syscall_list_file
)) {
227 ret
= PTR_ERR(syscall_list_file
);
230 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
233 fd_install(file_fd
, syscall_list_file
);
237 fput(syscall_list_file
);
239 put_unused_fd(file_fd
);
246 void lttng_abi_tracer_version(struct lttng_kernel_abi_tracer_version
*v
)
248 v
->major
= LTTNG_MODULES_MAJOR_VERSION
;
249 v
->minor
= LTTNG_MODULES_MINOR_VERSION
;
250 v
->patchlevel
= LTTNG_MODULES_PATCHLEVEL_VERSION
;
254 void lttng_abi_tracer_abi_version(struct lttng_kernel_abi_tracer_abi_version
*v
)
256 v
->major
= LTTNG_KERNEL_ABI_MAJOR_VERSION
;
257 v
->minor
= LTTNG_KERNEL_ABI_MINOR_VERSION
;
261 long lttng_abi_add_context(struct file
*file
,
262 struct lttng_kernel_abi_context
*context_param
,
263 struct lttng_kernel_ctx
**ctx
, struct lttng_kernel_session
*session
)
266 if (session
->priv
->been_active
)
269 switch (context_param
->ctx
) {
270 case LTTNG_KERNEL_ABI_CONTEXT_PID
:
271 return lttng_add_pid_to_ctx(ctx
);
272 case LTTNG_KERNEL_ABI_CONTEXT_PRIO
:
273 return lttng_add_prio_to_ctx(ctx
);
274 case LTTNG_KERNEL_ABI_CONTEXT_NICE
:
275 return lttng_add_nice_to_ctx(ctx
);
276 case LTTNG_KERNEL_ABI_CONTEXT_VPID
:
277 return lttng_add_vpid_to_ctx(ctx
);
278 case LTTNG_KERNEL_ABI_CONTEXT_TID
:
279 return lttng_add_tid_to_ctx(ctx
);
280 case LTTNG_KERNEL_ABI_CONTEXT_VTID
:
281 return lttng_add_vtid_to_ctx(ctx
);
282 case LTTNG_KERNEL_ABI_CONTEXT_PPID
:
283 return lttng_add_ppid_to_ctx(ctx
);
284 case LTTNG_KERNEL_ABI_CONTEXT_VPPID
:
285 return lttng_add_vppid_to_ctx(ctx
);
286 case LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER
:
287 context_param
->u
.perf_counter
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
288 return lttng_add_perf_counter_to_ctx(context_param
->u
.perf_counter
.type
,
289 context_param
->u
.perf_counter
.config
,
290 context_param
->u
.perf_counter
.name
,
292 case LTTNG_KERNEL_ABI_CONTEXT_PROCNAME
:
293 return lttng_add_procname_to_ctx(ctx
);
294 case LTTNG_KERNEL_ABI_CONTEXT_HOSTNAME
:
295 return lttng_add_hostname_to_ctx(ctx
);
296 case LTTNG_KERNEL_ABI_CONTEXT_CPU_ID
:
297 return lttng_add_cpu_id_to_ctx(ctx
);
298 case LTTNG_KERNEL_ABI_CONTEXT_INTERRUPTIBLE
:
299 return lttng_add_interruptible_to_ctx(ctx
);
300 case LTTNG_KERNEL_ABI_CONTEXT_NEED_RESCHEDULE
:
301 return lttng_add_need_reschedule_to_ctx(ctx
);
302 case LTTNG_KERNEL_ABI_CONTEXT_PREEMPTIBLE
:
303 return lttng_add_preemptible_to_ctx(ctx
);
304 case LTTNG_KERNEL_ABI_CONTEXT_MIGRATABLE
:
305 return lttng_add_migratable_to_ctx(ctx
);
306 case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_KERNEL
:
307 case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_USER
:
308 return lttng_add_callstack_to_ctx(ctx
, context_param
->ctx
);
309 case LTTNG_KERNEL_ABI_CONTEXT_CGROUP_NS
:
310 return lttng_add_cgroup_ns_to_ctx(ctx
);
311 case LTTNG_KERNEL_ABI_CONTEXT_IPC_NS
:
312 return lttng_add_ipc_ns_to_ctx(ctx
);
313 case LTTNG_KERNEL_ABI_CONTEXT_MNT_NS
:
314 return lttng_add_mnt_ns_to_ctx(ctx
);
315 case LTTNG_KERNEL_ABI_CONTEXT_NET_NS
:
316 return lttng_add_net_ns_to_ctx(ctx
);
317 case LTTNG_KERNEL_ABI_CONTEXT_PID_NS
:
318 return lttng_add_pid_ns_to_ctx(ctx
);
319 case LTTNG_KERNEL_ABI_CONTEXT_USER_NS
:
320 return lttng_add_user_ns_to_ctx(ctx
);
321 case LTTNG_KERNEL_ABI_CONTEXT_UTS_NS
:
322 return lttng_add_uts_ns_to_ctx(ctx
);
323 case LTTNG_KERNEL_ABI_CONTEXT_UID
:
324 return lttng_add_uid_to_ctx(ctx
);
325 case LTTNG_KERNEL_ABI_CONTEXT_EUID
:
326 return lttng_add_euid_to_ctx(ctx
);
327 case LTTNG_KERNEL_ABI_CONTEXT_SUID
:
328 return lttng_add_suid_to_ctx(ctx
);
329 case LTTNG_KERNEL_ABI_CONTEXT_GID
:
330 return lttng_add_gid_to_ctx(ctx
);
331 case LTTNG_KERNEL_ABI_CONTEXT_EGID
:
332 return lttng_add_egid_to_ctx(ctx
);
333 case LTTNG_KERNEL_ABI_CONTEXT_SGID
:
334 return lttng_add_sgid_to_ctx(ctx
);
335 case LTTNG_KERNEL_ABI_CONTEXT_VUID
:
336 return lttng_add_vuid_to_ctx(ctx
);
337 case LTTNG_KERNEL_ABI_CONTEXT_VEUID
:
338 return lttng_add_veuid_to_ctx(ctx
);
339 case LTTNG_KERNEL_ABI_CONTEXT_VSUID
:
340 return lttng_add_vsuid_to_ctx(ctx
);
341 case LTTNG_KERNEL_ABI_CONTEXT_VGID
:
342 return lttng_add_vgid_to_ctx(ctx
);
343 case LTTNG_KERNEL_ABI_CONTEXT_VEGID
:
344 return lttng_add_vegid_to_ctx(ctx
);
345 case LTTNG_KERNEL_ABI_CONTEXT_VSGID
:
346 return lttng_add_vsgid_to_ctx(ctx
);
347 case LTTNG_KERNEL_ABI_CONTEXT_TIME_NS
:
348 return lttng_add_time_ns_to_ctx(ctx
);
355 * lttng_ioctl - lttng syscall through ioctl
361 * This ioctl implements lttng commands:
362 * LTTNG_KERNEL_ABI_SESSION
363 * Returns a LTTng trace session file descriptor
364 * LTTNG_KERNEL_ABI_TRACER_VERSION
365 * Returns the LTTng kernel tracer version
366 * LTTNG_KERNEL_ABI_TRACEPOINT_LIST
367 * Returns a file descriptor listing available tracepoints
368 * LTTNG_KERNEL_ABI_WAIT_QUIESCENT
369 * Returns after all previously running probes have completed
370 * LTTNG_KERNEL_ABI_TRACER_ABI_VERSION
371 * Returns the LTTng kernel tracer ABI version
372 * LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE
373 * Returns a LTTng event notifier group file descriptor
375 * The returned session will be deleted when its file descriptor is closed.
378 long lttng_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
381 case LTTNG_KERNEL_ABI_OLD_SESSION
:
382 case LTTNG_KERNEL_ABI_SESSION
:
383 return lttng_abi_create_session();
384 case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE
:
385 return lttng_abi_create_event_notifier_group();
386 case LTTNG_KERNEL_ABI_OLD_TRACER_VERSION
:
388 struct lttng_kernel_abi_tracer_version v
;
389 struct lttng_kernel_abi_old_tracer_version oldv
;
390 struct lttng_kernel_abi_old_tracer_version
*uversion
=
391 (struct lttng_kernel_abi_old_tracer_version __user
*) arg
;
393 lttng_abi_tracer_version(&v
);
394 oldv
.major
= v
.major
;
395 oldv
.minor
= v
.minor
;
396 oldv
.patchlevel
= v
.patchlevel
;
398 if (copy_to_user(uversion
, &oldv
, sizeof(oldv
)))
402 case LTTNG_KERNEL_ABI_TRACER_VERSION
:
404 struct lttng_kernel_abi_tracer_version version
;
405 struct lttng_kernel_abi_tracer_version
*uversion
=
406 (struct lttng_kernel_abi_tracer_version __user
*) arg
;
408 lttng_abi_tracer_version(&version
);
410 if (copy_to_user(uversion
, &version
, sizeof(version
)))
414 case LTTNG_KERNEL_ABI_TRACER_ABI_VERSION
:
416 struct lttng_kernel_abi_tracer_abi_version version
;
417 struct lttng_kernel_abi_tracer_abi_version
*uversion
=
418 (struct lttng_kernel_abi_tracer_abi_version __user
*) arg
;
420 lttng_abi_tracer_abi_version(&version
);
422 if (copy_to_user(uversion
, &version
, sizeof(version
)))
426 case LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST
:
427 case LTTNG_KERNEL_ABI_TRACEPOINT_LIST
:
428 return lttng_abi_tracepoint_list();
429 case LTTNG_KERNEL_ABI_SYSCALL_LIST
:
430 return lttng_abi_syscall_list();
431 case LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT
:
432 case LTTNG_KERNEL_ABI_WAIT_QUIESCENT
:
435 case LTTNG_KERNEL_ABI_OLD_CALIBRATE
:
437 struct lttng_kernel_abi_old_calibrate __user
*ucalibrate
=
438 (struct lttng_kernel_abi_old_calibrate __user
*) arg
;
439 struct lttng_kernel_abi_old_calibrate old_calibrate
;
440 struct lttng_kernel_abi_calibrate calibrate
;
443 if (copy_from_user(&old_calibrate
, ucalibrate
, sizeof(old_calibrate
)))
445 calibrate
.type
= old_calibrate
.type
;
446 ret
= lttng_calibrate(&calibrate
);
447 if (copy_to_user(ucalibrate
, &old_calibrate
, sizeof(old_calibrate
)))
451 case LTTNG_KERNEL_ABI_CALIBRATE
:
453 struct lttng_kernel_abi_calibrate __user
*ucalibrate
=
454 (struct lttng_kernel_abi_calibrate __user
*) arg
;
455 struct lttng_kernel_abi_calibrate calibrate
;
458 if (copy_from_user(&calibrate
, ucalibrate
, sizeof(calibrate
)))
460 ret
= lttng_calibrate(&calibrate
);
461 if (copy_to_user(ucalibrate
, &calibrate
, sizeof(calibrate
)))
470 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
471 static const struct proc_ops lttng_proc_ops
= {
472 .proc_ioctl
= lttng_ioctl
,
474 .proc_compat_ioctl
= lttng_ioctl
,
475 #endif /* CONFIG_COMPAT */
478 static const struct file_operations lttng_proc_ops
= {
479 .owner
= THIS_MODULE
,
480 .unlocked_ioctl
= lttng_ioctl
,
482 .compat_ioctl
= lttng_ioctl
,
483 #endif /* CONFIG_COMPAT */
488 int lttng_abi_create_channel(struct file
*session_file
,
489 struct lttng_kernel_abi_channel
*chan_param
,
490 enum channel_type channel_type
)
492 struct lttng_kernel_session
*session
= session_file
->private_data
;
493 const struct file_operations
*fops
= NULL
;
494 const char *transport_name
;
495 struct lttng_kernel_channel_buffer
*chan
;
496 struct file
*chan_file
;
500 chan_fd
= lttng_get_unused_fd();
505 switch (channel_type
) {
506 case PER_CPU_CHANNEL
:
507 fops
= <tng_channel_fops
;
509 case METADATA_CHANNEL
:
510 fops
= <tng_metadata_fops
;
514 chan_file
= anon_inode_getfile("[lttng_channel]",
517 if (IS_ERR(chan_file
)) {
518 ret
= PTR_ERR(chan_file
);
521 switch (channel_type
) {
522 case PER_CPU_CHANNEL
:
523 if (chan_param
->output
== LTTNG_KERNEL_ABI_SPLICE
) {
524 transport_name
= chan_param
->overwrite
?
525 "relay-overwrite" : "relay-discard";
526 } else if (chan_param
->output
== LTTNG_KERNEL_ABI_MMAP
) {
527 transport_name
= chan_param
->overwrite
?
528 "relay-overwrite-mmap" : "relay-discard-mmap";
533 case METADATA_CHANNEL
:
534 if (chan_param
->output
== LTTNG_KERNEL_ABI_SPLICE
)
535 transport_name
= "relay-metadata";
536 else if (chan_param
->output
== LTTNG_KERNEL_ABI_MMAP
)
537 transport_name
= "relay-metadata-mmap";
542 transport_name
= "<unknown>";
545 if (!atomic_long_add_unless(&session_file
->f_count
, 1, LONG_MAX
)) {
550 * We tolerate no failure path after channel creation. It will stay
551 * invariant for the rest of the session.
553 chan
= lttng_channel_create(session
, transport_name
, NULL
,
554 chan_param
->subbuf_size
,
555 chan_param
->num_subbuf
,
556 chan_param
->switch_timer_interval
,
557 chan_param
->read_timer_interval
,
563 chan
->priv
->parent
.file
= chan_file
;
564 chan_file
->private_data
= chan
;
565 fd_install(chan_fd
, chan_file
);
570 atomic_long_dec(&session_file
->f_count
);
574 put_unused_fd(chan_fd
);
580 int lttng_abi_session_set_name(struct lttng_kernel_session
*session
,
581 struct lttng_kernel_abi_session_name
*name
)
585 len
= strnlen(name
->name
, LTTNG_KERNEL_ABI_SESSION_NAME_LEN
);
587 if (len
== LTTNG_KERNEL_ABI_SESSION_NAME_LEN
) {
588 /* Name is too long/malformed */
592 strcpy(session
->priv
->name
, name
->name
);
597 int lttng_abi_session_set_creation_time(struct lttng_kernel_session
*session
,
598 struct lttng_kernel_abi_session_creation_time
*time
)
602 len
= strnlen(time
->iso8601
, LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN
);
604 if (len
== LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN
) {
605 /* Time is too long/malformed */
609 strcpy(session
->priv
->creation_time
, time
->iso8601
);
614 int lttng_counter_release(struct inode
*inode
, struct file
*file
)
616 struct lttng_counter
*counter
= file
->private_data
;
620 * Do not destroy the counter itself. Wait of the owner
621 * (event_notifier group) to be destroyed.
623 fput(counter
->owner
);
630 long lttng_counter_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
632 struct lttng_counter
*counter
= file
->private_data
;
633 size_t indexes
[LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX
] = { 0 };
637 case LTTNG_KERNEL_ABI_COUNTER_READ
:
639 struct lttng_kernel_abi_counter_read local_counter_read
;
640 struct lttng_kernel_abi_counter_read __user
*ucounter_read
=
641 (struct lttng_kernel_abi_counter_read __user
*) arg
;
642 bool overflow
, underflow
;
647 if (copy_from_user(&local_counter_read
, ucounter_read
,
648 sizeof(local_counter_read
)))
650 if (validate_zeroed_padding(local_counter_read
.padding
,
651 sizeof(local_counter_read
.padding
)))
653 if (local_counter_read
.index
.number_dimensions
> LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX
)
656 /* Cast all indexes into size_t. */
657 for (i
= 0; i
< local_counter_read
.index
.number_dimensions
; i
++)
658 indexes
[i
] = (size_t) local_counter_read
.index
.dimension_indexes
[i
];
659 cpu
= local_counter_read
.cpu
;
661 ret
= lttng_kernel_counter_read(counter
, indexes
, cpu
, &value
,
662 &overflow
, &underflow
);
665 local_counter_read
.value
.value
= value
;
666 local_counter_read
.value
.overflow
= overflow
;
667 local_counter_read
.value
.underflow
= underflow
;
669 if (copy_to_user(&ucounter_read
->value
, &local_counter_read
.value
,
670 sizeof(local_counter_read
.value
)))
675 case LTTNG_KERNEL_ABI_COUNTER_AGGREGATE
:
677 struct lttng_kernel_abi_counter_aggregate local_counter_aggregate
;
678 struct lttng_kernel_abi_counter_aggregate __user
*ucounter_aggregate
=
679 (struct lttng_kernel_abi_counter_aggregate __user
*) arg
;
680 bool overflow
, underflow
;
684 if (copy_from_user(&local_counter_aggregate
, ucounter_aggregate
,
685 sizeof(local_counter_aggregate
)))
687 if (validate_zeroed_padding(local_counter_aggregate
.padding
,
688 sizeof(local_counter_aggregate
.padding
)))
690 if (local_counter_aggregate
.index
.number_dimensions
> LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX
)
693 /* Cast all indexes into size_t. */
694 for (i
= 0; i
< local_counter_aggregate
.index
.number_dimensions
; i
++)
695 indexes
[i
] = (size_t) local_counter_aggregate
.index
.dimension_indexes
[i
];
697 ret
= lttng_kernel_counter_aggregate(counter
, indexes
, &value
,
698 &overflow
, &underflow
);
701 local_counter_aggregate
.value
.value
= value
;
702 local_counter_aggregate
.value
.overflow
= overflow
;
703 local_counter_aggregate
.value
.underflow
= underflow
;
705 if (copy_to_user(&ucounter_aggregate
->value
, &local_counter_aggregate
.value
,
706 sizeof(local_counter_aggregate
.value
)))
711 case LTTNG_KERNEL_ABI_COUNTER_CLEAR
:
713 struct lttng_kernel_abi_counter_clear local_counter_clear
;
714 struct lttng_kernel_abi_counter_clear __user
*ucounter_clear
=
715 (struct lttng_kernel_abi_counter_clear __user
*) arg
;
717 if (copy_from_user(&local_counter_clear
, ucounter_clear
,
718 sizeof(local_counter_clear
)))
720 if (validate_zeroed_padding(local_counter_clear
.padding
,
721 sizeof(local_counter_clear
.padding
)))
723 if (local_counter_clear
.index
.number_dimensions
> LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX
)
726 /* Cast all indexes into size_t. */
727 for (i
= 0; i
< local_counter_clear
.index
.number_dimensions
; i
++)
728 indexes
[i
] = (size_t) local_counter_clear
.index
.dimension_indexes
[i
];
730 return lttng_kernel_counter_clear(counter
, indexes
);
737 static const struct file_operations lttng_counter_fops
= {
738 .owner
= THIS_MODULE
,
739 .release
= lttng_counter_release
,
740 .unlocked_ioctl
= lttng_counter_ioctl
,
742 .compat_ioctl
= lttng_counter_ioctl
,
748 enum tracker_type
get_tracker_type(struct lttng_kernel_abi_tracker_args
*tracker
)
750 switch (tracker
->type
) {
751 case LTTNG_KERNEL_ABI_TRACKER_PID
:
753 case LTTNG_KERNEL_ABI_TRACKER_VPID
:
755 case LTTNG_KERNEL_ABI_TRACKER_UID
:
757 case LTTNG_KERNEL_ABI_TRACKER_VUID
:
759 case LTTNG_KERNEL_ABI_TRACKER_GID
:
761 case LTTNG_KERNEL_ABI_TRACKER_VGID
:
764 return TRACKER_UNKNOWN
;
769 * lttng_session_ioctl - lttng session fd ioctl
775 * This ioctl implements lttng commands:
776 * LTTNG_KERNEL_ABI_CHANNEL
777 * Returns a LTTng channel file descriptor
778 * LTTNG_KERNEL_ABI_ENABLE
779 * Enables tracing for a session (weak enable)
780 * LTTNG_KERNEL_ABI_DISABLE
781 * Disables tracing for a session (strong disable)
782 * LTTNG_KERNEL_ABI_METADATA
783 * Returns a LTTng metadata file descriptor
784 * LTTNG_KERNEL_ABI_SESSION_TRACK_PID
785 * Add PID to session PID tracker
786 * LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID
787 * Remove PID from session PID tracker
788 * LTTNG_KERNEL_ABI_SESSION_TRACK_ID
790 * LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID
791 * Remove ID from tracker
793 * The returned channel will be deleted when its file descriptor is closed.
796 long lttng_session_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
798 struct lttng_kernel_session
*session
= file
->private_data
;
799 struct lttng_kernel_abi_channel chan_param
;
800 struct lttng_kernel_abi_old_channel old_chan_param
;
803 * Handle backward compatibility. OLD commands have wrong
804 * directions, replace them by the correct direction.
807 case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_PID
:
808 cmd
= LTTNG_KERNEL_ABI_SESSION_TRACK_PID
;
810 case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_PID
:
811 cmd
= LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID
;
813 case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_ID
:
814 cmd
= LTTNG_KERNEL_ABI_SESSION_TRACK_ID
;
816 case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_ID
:
817 cmd
= LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID
;
819 case LTTNG_KERNEL_ABI_OLD_SESSION_LIST_TRACKER_IDS
:
820 cmd
= LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS
;
822 case LTTNG_KERNEL_ABI_OLD_SESSION_SET_NAME
:
823 cmd
= LTTNG_KERNEL_ABI_SESSION_SET_NAME
;
825 case LTTNG_KERNEL_ABI_OLD_SESSION_SET_CREATION_TIME
:
826 cmd
= LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME
;
834 case LTTNG_KERNEL_ABI_OLD_CHANNEL
:
836 if (copy_from_user(&old_chan_param
,
837 (struct lttng_kernel_abi_old_channel __user
*) arg
,
838 sizeof(struct lttng_kernel_abi_old_channel
)))
840 chan_param
.overwrite
= old_chan_param
.overwrite
;
841 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
842 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
843 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
844 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
845 chan_param
.output
= old_chan_param
.output
;
847 return lttng_abi_create_channel(file
, &chan_param
,
850 case LTTNG_KERNEL_ABI_CHANNEL
:
852 if (copy_from_user(&chan_param
,
853 (struct lttng_kernel_abi_channel __user
*) arg
,
854 sizeof(struct lttng_kernel_abi_channel
)))
856 return lttng_abi_create_channel(file
, &chan_param
,
859 case LTTNG_KERNEL_ABI_OLD_SESSION_START
:
860 case LTTNG_KERNEL_ABI_OLD_ENABLE
:
861 case LTTNG_KERNEL_ABI_SESSION_START
:
862 case LTTNG_KERNEL_ABI_ENABLE
:
863 return lttng_session_enable(session
);
864 case LTTNG_KERNEL_ABI_OLD_SESSION_STOP
:
865 case LTTNG_KERNEL_ABI_OLD_DISABLE
:
866 case LTTNG_KERNEL_ABI_SESSION_STOP
:
867 case LTTNG_KERNEL_ABI_DISABLE
:
868 return lttng_session_disable(session
);
869 case LTTNG_KERNEL_ABI_OLD_METADATA
:
871 if (copy_from_user(&old_chan_param
,
872 (struct lttng_kernel_abi_old_channel __user
*) arg
,
873 sizeof(struct lttng_kernel_abi_old_channel
)))
875 chan_param
.overwrite
= old_chan_param
.overwrite
;
876 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
877 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
878 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
879 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
880 chan_param
.output
= old_chan_param
.output
;
882 return lttng_abi_create_channel(file
, &chan_param
,
885 case LTTNG_KERNEL_ABI_METADATA
:
887 if (copy_from_user(&chan_param
,
888 (struct lttng_kernel_abi_channel __user
*) arg
,
889 sizeof(struct lttng_kernel_abi_channel
)))
891 return lttng_abi_create_channel(file
, &chan_param
,
894 case LTTNG_KERNEL_ABI_SESSION_TRACK_PID
:
895 return lttng_session_track_id(session
, TRACKER_PID
, (int) arg
);
896 case LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID
:
897 return lttng_session_untrack_id(session
, TRACKER_PID
, (int) arg
);
898 case LTTNG_KERNEL_ABI_SESSION_TRACK_ID
:
900 struct lttng_kernel_abi_tracker_args tracker
;
901 enum tracker_type tracker_type
;
903 if (copy_from_user(&tracker
,
904 (struct lttng_kernel_abi_tracker_args __user
*) arg
,
905 sizeof(struct lttng_kernel_abi_tracker_args
)))
907 tracker_type
= get_tracker_type(&tracker
);
908 if (tracker_type
== TRACKER_UNKNOWN
)
910 return lttng_session_track_id(session
, tracker_type
, tracker
.id
);
912 case LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID
:
914 struct lttng_kernel_abi_tracker_args tracker
;
915 enum tracker_type tracker_type
;
917 if (copy_from_user(&tracker
,
918 (struct lttng_kernel_abi_tracker_args __user
*) arg
,
919 sizeof(struct lttng_kernel_abi_tracker_args
)))
921 tracker_type
= get_tracker_type(&tracker
);
922 if (tracker_type
== TRACKER_UNKNOWN
)
924 return lttng_session_untrack_id(session
, tracker_type
,
927 case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS
:
928 return lttng_session_list_tracker_ids(session
, TRACKER_PID
);
929 case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS
:
931 struct lttng_kernel_abi_tracker_args tracker
;
932 enum tracker_type tracker_type
;
934 if (copy_from_user(&tracker
,
935 (struct lttng_kernel_abi_tracker_args __user
*) arg
,
936 sizeof(struct lttng_kernel_abi_tracker_args
)))
938 tracker_type
= get_tracker_type(&tracker
);
939 if (tracker_type
== TRACKER_UNKNOWN
)
941 return lttng_session_list_tracker_ids(session
, tracker_type
);
943 case LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN
:
944 return lttng_session_metadata_regenerate(session
);
945 case LTTNG_KERNEL_ABI_SESSION_STATEDUMP
:
946 return lttng_session_statedump(session
);
947 case LTTNG_KERNEL_ABI_SESSION_SET_NAME
:
949 struct lttng_kernel_abi_session_name name
;
951 if (copy_from_user(&name
,
952 (struct lttng_kernel_abi_session_name __user
*) arg
,
953 sizeof(struct lttng_kernel_abi_session_name
)))
955 return lttng_abi_session_set_name(session
, &name
);
957 case LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME
:
959 struct lttng_kernel_abi_session_creation_time time
;
961 if (copy_from_user(&time
,
962 (struct lttng_kernel_abi_session_creation_time __user
*) arg
,
963 sizeof(struct lttng_kernel_abi_session_creation_time
)))
965 return lttng_abi_session_set_creation_time(session
, &time
);
973 * Called when the last file reference is dropped.
975 * Big fat note: channels and events are invariant for the whole session after
976 * their creation. So this session destruction also destroys all channel and
977 * event structures specific to this session (they are not destroyed when their
978 * individual file is released).
981 int lttng_session_release(struct inode
*inode
, struct file
*file
)
983 struct lttng_kernel_session
*session
= file
->private_data
;
986 lttng_session_destroy(session
);
990 static const struct file_operations lttng_session_fops
= {
991 .owner
= THIS_MODULE
,
992 .release
= lttng_session_release
,
993 .unlocked_ioctl
= lttng_session_ioctl
,
995 .compat_ioctl
= lttng_session_ioctl
,
1000 * When encountering empty buffer, flush current sub-buffer if non-empty
1001 * and retry (if new data available to read after flush).
1004 ssize_t
lttng_event_notifier_group_notif_read(struct file
*filp
, char __user
*user_buf
,
1005 size_t count
, loff_t
*ppos
)
1007 struct lttng_event_notifier_group
*event_notifier_group
= filp
->private_data
;
1008 struct lttng_kernel_ring_buffer_channel
*chan
= event_notifier_group
->chan
;
1009 struct lttng_kernel_ring_buffer
*buf
= event_notifier_group
->buf
;
1010 ssize_t read_count
= 0, len
;
1014 if (!lttng_access_ok(VERIFY_WRITE
, user_buf
, count
))
1017 /* Finish copy of previous record */
1019 if (read_count
< count
) {
1020 len
= chan
->iter
.len_left
;
1021 read_offset
= *ppos
;
1026 while (read_count
< count
) {
1027 size_t copy_len
, space_left
;
1029 len
= lib_ring_buffer_get_next_record(chan
, buf
);
1033 * Check if buffer is finalized (end of file).
1035 if (len
== -ENODATA
) {
1036 /* A 0 read_count will tell about end of file */
1039 if (filp
->f_flags
& O_NONBLOCK
) {
1041 read_count
= -EAGAIN
;
1047 * No data available at the moment, return what
1054 * Wait for returned len to be >= 0 or -ENODATA.
1056 error
= wait_event_interruptible(
1057 event_notifier_group
->read_wait
,
1058 ((len
= lib_ring_buffer_get_next_record(
1059 chan
, buf
)), len
!= -EAGAIN
));
1060 CHAN_WARN_ON(chan
, len
== -EBUSY
);
1065 CHAN_WARN_ON(chan
, len
< 0 && len
!= -ENODATA
);
1069 read_offset
= buf
->iter
.read_offset
;
1071 space_left
= count
- read_count
;
1072 if (len
<= space_left
) {
1074 chan
->iter
.len_left
= 0;
1077 copy_len
= space_left
;
1078 chan
->iter
.len_left
= len
- copy_len
;
1079 *ppos
= read_offset
+ copy_len
;
1081 if (__lib_ring_buffer_copy_to_user(&buf
->backend
, read_offset
,
1082 &user_buf
[read_count
],
1085 * Leave the len_left and ppos values at their current
1086 * state, as we currently have a valid event to read.
1090 read_count
+= copy_len
;
1096 chan
->iter
.len_left
= 0;
1099 lib_ring_buffer_put_current_record(buf
);
1104 * If the ring buffer is non empty (even just a partial subbuffer), return that
1105 * there is data available. Perform a ring buffer flush if we encounter a
1106 * non-empty ring buffer which does not have any consumeable subbuffer available.
1109 unsigned int lttng_event_notifier_group_notif_poll(struct file
*filp
,
1112 unsigned int mask
= 0;
1113 struct lttng_event_notifier_group
*event_notifier_group
= filp
->private_data
;
1114 struct lttng_kernel_ring_buffer_channel
*chan
= event_notifier_group
->chan
;
1115 struct lttng_kernel_ring_buffer
*buf
= event_notifier_group
->buf
;
1116 const struct lttng_kernel_ring_buffer_config
*config
= &chan
->backend
.config
;
1117 int finalized
, disabled
;
1118 unsigned long consumed
, offset
;
1119 size_t subbuffer_header_size
= config
->cb
.subbuffer_header_size();
1121 if (filp
->f_mode
& FMODE_READ
) {
1122 poll_wait_set_exclusive(wait
);
1123 poll_wait(filp
, &event_notifier_group
->read_wait
, wait
);
1125 finalized
= lib_ring_buffer_is_finalized(config
, buf
);
1126 disabled
= lib_ring_buffer_channel_is_disabled(chan
);
1129 * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering
1130 * finalized load before offsets loads.
1132 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
1137 offset
= lib_ring_buffer_get_offset(config
, buf
);
1138 consumed
= lib_ring_buffer_get_consumed(config
, buf
);
1141 * If there is no buffer available to consume.
1143 if (subbuf_trunc(offset
, chan
) - subbuf_trunc(consumed
, chan
) == 0) {
1145 * If there is a non-empty subbuffer, flush and try again.
1147 if (subbuf_offset(offset
, chan
) > subbuffer_header_size
) {
1148 lib_ring_buffer_switch_remote(buf
);
1156 * The memory barriers
1157 * __wait_event()/wake_up_interruptible() take
1158 * care of "raw_spin_is_locked" memory ordering.
1160 if (raw_spin_is_locked(&buf
->raw_tick_nohz_spinlock
))
1166 if (subbuf_trunc(offset
, chan
) - subbuf_trunc(consumed
, chan
)
1167 >= chan
->backend
.buf_size
)
1168 return POLLPRI
| POLLRDBAND
;
1170 return POLLIN
| POLLRDNORM
;
1178 * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation
1179 * @inode: opened inode
1180 * @file: opened file
1182 * Open implementation. Makes sure only one open instance of a buffer is
1183 * done at a given moment.
1185 static int lttng_event_notifier_group_notif_open(struct inode
*inode
, struct file
*file
)
1187 struct lttng_event_notifier_group
*event_notifier_group
= inode
->i_private
;
1188 struct lttng_kernel_ring_buffer
*buf
= event_notifier_group
->buf
;
1190 file
->private_data
= event_notifier_group
;
1191 return lib_ring_buffer_open(inode
, file
, buf
);
1195 * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation
1196 * @inode: opened inode
1197 * @file: opened file
1199 * Release implementation.
1201 static int lttng_event_notifier_group_notif_release(struct inode
*inode
, struct file
*file
)
1203 struct lttng_event_notifier_group
*event_notifier_group
= file
->private_data
;
1204 struct lttng_kernel_ring_buffer
*buf
= event_notifier_group
->buf
;
1207 ret
= lib_ring_buffer_release(inode
, file
, buf
);
1210 fput(event_notifier_group
->file
);
1214 static const struct file_operations lttng_event_notifier_group_notif_fops
= {
1215 .owner
= THIS_MODULE
,
1216 .open
= lttng_event_notifier_group_notif_open
,
1217 .release
= lttng_event_notifier_group_notif_release
,
1218 .read
= lttng_event_notifier_group_notif_read
,
1219 .poll
= lttng_event_notifier_group_notif_poll
,
1223 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
1227 * Handles the poll operations for the metadata channels.
1230 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
1233 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1234 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1236 unsigned int mask
= 0;
1238 if (filp
->f_mode
& FMODE_READ
) {
1239 poll_wait_set_exclusive(wait
);
1240 poll_wait(filp
, &stream
->read_wait
, wait
);
1242 finalized
= stream
->finalized
;
1245 * lib_ring_buffer_is_finalized() contains a smp_rmb()
1246 * ordering finalized load before offsets loads.
1248 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
1253 mutex_lock(&stream
->metadata_cache
->lock
);
1254 if (stream
->metadata_cache
->metadata_written
>
1255 stream
->metadata_out
)
1257 mutex_unlock(&stream
->metadata_cache
->lock
);
1264 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
1265 unsigned int cmd
, unsigned long arg
)
1267 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1269 stream
->metadata_out
= stream
->metadata_in
;
1273 * Reset the counter of how much metadata has been consumed to 0. That way,
1274 * the consumer receives the content of the metadata cache unchanged. This is
1275 * different from the metadata_regenerate where the offset from epoch is
1276 * resampled, here we want the exact same content as the last time the metadata
1277 * was generated. This command is only possible if all the metadata written
1278 * in the cache has been output to the metadata stream to avoid corrupting the
1281 * Return 0 on success, a negative value on error.
1284 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
1287 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
1289 mutex_lock(&cache
->lock
);
1290 if (stream
->metadata_out
!= cache
->metadata_written
) {
1294 stream
->metadata_out
= 0;
1295 stream
->metadata_in
= 0;
1296 wake_up_interruptible(&stream
->read_wait
);
1300 mutex_unlock(&cache
->lock
);
1305 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
1306 unsigned int cmd
, unsigned long arg
)
1309 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1310 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1311 unsigned int rb_cmd
;
1314 if (cmd
== LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
)
1315 rb_cmd
= LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF
;
1320 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF
:
1322 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1323 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1324 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
1326 ret
= lttng_metadata_output_channel(stream
, chan
, NULL
);
1328 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
1334 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF
:
1337 * Random access is not allowed for metadata channel.
1341 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY
:
1343 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH
:
1345 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1346 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1347 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
1350 * Before doing the actual ring buffer flush, write up to one
1351 * packet of metadata in the ring buffer.
1353 ret
= lttng_metadata_output_channel(stream
, chan
, NULL
);
1358 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION
:
1360 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1362 return put_u64(stream
->version
, arg
);
1364 case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP
:
1366 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1368 return lttng_metadata_cache_dump(stream
);
1370 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
:
1372 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1373 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1374 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
1376 ret
= lttng_metadata_output_channel(stream
, chan
, &coherent
);
1378 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
1380 } else if (ret
< 0) {
1388 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1390 /* Performing lib ring buffer ioctl after our own. */
1391 ret
= lib_ring_buffer_ioctl(filp
, rb_cmd
, arg
, buf
);
1396 case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF
:
1398 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
1402 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
:
1404 return put_u32(coherent
, arg
);
1413 #ifdef CONFIG_COMPAT
1415 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
1416 unsigned int cmd
, unsigned long arg
)
1419 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1420 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1421 unsigned int rb_cmd
;
1424 if (cmd
== LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
)
1425 rb_cmd
= LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF
;
1430 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF
:
1432 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1433 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1434 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
1436 ret
= lttng_metadata_output_channel(stream
, chan
, NULL
);
1438 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
1444 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF
:
1447 * Random access is not allowed for metadata channel.
1451 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY
:
1453 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH
:
1455 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1456 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1457 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
1460 * Before doing the actual ring buffer flush, write up to one
1461 * packet of metadata in the ring buffer.
1463 ret
= lttng_metadata_output_channel(stream
, chan
, NULL
);
1468 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION
:
1470 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1472 return put_u64(stream
->version
, arg
);
1474 case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP
:
1476 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1478 return lttng_metadata_cache_dump(stream
);
1480 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
:
1482 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1483 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1484 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
1486 ret
= lttng_metadata_output_channel(stream
, chan
, &coherent
);
1488 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
1490 } else if (ret
< 0) {
1498 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1500 /* Performing lib ring buffer ioctl after our own. */
1501 ret
= lib_ring_buffer_compat_ioctl(filp
, rb_cmd
, arg
, buf
);
1506 case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF
:
1508 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
1512 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
:
1514 return put_u32(coherent
, arg
);
1525 * This is not used by anonymous file descriptors. This code is left
1526 * there if we ever want to implement an inode with open() operation.
1529 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
1531 struct lttng_metadata_stream
*stream
= inode
->i_private
;
1532 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1534 file
->private_data
= buf
;
1536 * Since life-time of metadata cache differs from that of
1537 * session, we need to keep our own reference on the transport.
1539 if (!try_module_get(stream
->transport
->owner
)) {
1540 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
1543 return lib_ring_buffer_open(inode
, file
, buf
);
1547 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
1549 struct lttng_metadata_stream
*stream
= file
->private_data
;
1550 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1552 mutex_lock(&stream
->metadata_cache
->lock
);
1553 list_del(&stream
->list
);
1554 mutex_unlock(&stream
->metadata_cache
->lock
);
1555 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
1556 module_put(stream
->transport
->owner
);
1558 return lib_ring_buffer_release(inode
, file
, buf
);
1562 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
1563 struct pipe_inode_info
*pipe
, size_t len
,
1566 struct lttng_metadata_stream
*stream
= in
->private_data
;
1567 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1569 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
1574 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
1575 struct vm_area_struct
*vma
)
1577 struct lttng_metadata_stream
*stream
= filp
->private_data
;
1578 struct lttng_kernel_ring_buffer
*buf
= stream
->priv
;
1580 return lib_ring_buffer_mmap(filp
, vma
, buf
);
1584 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
1585 .owner
= THIS_MODULE
,
1586 .open
= lttng_metadata_ring_buffer_open
,
1587 .release
= lttng_metadata_ring_buffer_release
,
1588 .poll
= lttng_metadata_ring_buffer_poll
,
1589 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
1590 .mmap
= lttng_metadata_ring_buffer_mmap
,
1591 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
1592 .llseek
= vfs_lib_ring_buffer_no_llseek
,
1593 #ifdef CONFIG_COMPAT
1594 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
1599 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
1600 const struct file_operations
*fops
, const char *name
)
1603 struct file
*stream_file
;
1605 stream_fd
= lttng_get_unused_fd();
1606 if (stream_fd
< 0) {
1610 stream_file
= anon_inode_getfile(name
, fops
, stream_priv
, O_RDWR
);
1611 if (IS_ERR(stream_file
)) {
1612 ret
= PTR_ERR(stream_file
);
1616 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1617 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1618 * file descriptor, so we set FMODE_PREAD here.
1620 stream_file
->f_mode
|= FMODE_PREAD
;
1621 fd_install(stream_fd
, stream_file
);
1623 * The stream holds a reference to the channel within the generic ring
1624 * buffer library, so no need to hold a refcount on the channel and
1625 * session files here.
1630 put_unused_fd(stream_fd
);
1636 int lttng_abi_open_stream(struct file
*channel_file
)
1638 struct lttng_kernel_channel_buffer
*channel
= channel_file
->private_data
;
1639 struct lttng_kernel_ring_buffer
*buf
;
1643 buf
= channel
->ops
->priv
->buffer_read_open(channel
->priv
->rb_chan
);
1648 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1649 <tng_stream_ring_buffer_file_operations
,
1657 channel
->ops
->priv
->buffer_read_close(buf
);
1662 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
1664 struct lttng_kernel_channel_buffer
*channel
= channel_file
->private_data
;
1665 struct lttng_kernel_session
*session
= channel
->parent
.session
;
1666 struct lttng_kernel_ring_buffer
*buf
;
1668 struct lttng_metadata_stream
*metadata_stream
;
1671 buf
= channel
->ops
->priv
->buffer_read_open(channel
->priv
->rb_chan
);
1675 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1677 if (!metadata_stream
) {
1681 metadata_stream
->metadata_cache
= session
->priv
->metadata_cache
;
1682 init_waitqueue_head(&metadata_stream
->read_wait
);
1683 metadata_stream
->priv
= buf
;
1684 stream_priv
= metadata_stream
;
1685 metadata_stream
->transport
= channel
->priv
->transport
;
1686 /* Initial state is an empty metadata, considered as incoherent. */
1687 metadata_stream
->coherent
= false;
1690 * Since life-time of metadata cache differs from that of
1691 * session, we need to keep our own reference on the transport.
1693 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1694 printk(KERN_WARNING
"LTTng: Can't lock transport module.\n");
1699 if (!lttng_kref_get(&session
->priv
->metadata_cache
->refcount
)) {
1704 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1705 <tng_metadata_ring_buffer_file_operations
,
1706 "[lttng_metadata_stream]");
1710 mutex_lock(&session
->priv
->metadata_cache
->lock
);
1711 list_add(&metadata_stream
->list
,
1712 &session
->priv
->metadata_cache
->metadata_stream
);
1713 mutex_unlock(&session
->priv
->metadata_cache
->lock
);
1717 kref_put(&session
->priv
->metadata_cache
->refcount
, metadata_cache_destroy
);
1719 module_put(metadata_stream
->transport
->owner
);
1721 kfree(metadata_stream
);
1723 channel
->ops
->priv
->buffer_read_close(buf
);
1728 int lttng_abi_open_event_notifier_group_stream(struct file
*notif_file
)
1730 struct lttng_event_notifier_group
*event_notifier_group
= notif_file
->private_data
;
1731 struct lttng_kernel_ring_buffer_channel
*chan
= event_notifier_group
->chan
;
1732 struct lttng_kernel_ring_buffer
*buf
;
1736 buf
= event_notifier_group
->ops
->priv
->buffer_read_open(chan
);
1740 /* The event_notifier notification fd holds a reference on the event_notifier group */
1741 if (!atomic_long_add_unless(¬if_file
->f_count
, 1, LONG_MAX
)) {
1743 goto refcount_error
;
1745 event_notifier_group
->buf
= buf
;
1746 stream_priv
= event_notifier_group
;
1747 ret
= lttng_abi_create_stream_fd(notif_file
, stream_priv
,
1748 <tng_event_notifier_group_notif_fops
,
1749 "[lttng_event_notifier_stream]");
1756 atomic_long_dec(¬if_file
->f_count
);
1758 event_notifier_group
->ops
->priv
->buffer_read_close(buf
);
1763 int lttng_abi_validate_event_param(struct lttng_kernel_abi_event
*event_param
)
1765 /* Limit ABI to implemented features. */
1766 switch (event_param
->instrumentation
) {
1767 case LTTNG_KERNEL_ABI_SYSCALL
:
1768 switch (event_param
->u
.syscall
.entryexit
) {
1769 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1771 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1773 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1778 switch (event_param
->u
.syscall
.abi
) {
1779 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
:
1784 switch (event_param
->u
.syscall
.match
) {
1785 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
:
1792 case LTTNG_KERNEL_ABI_KRETPROBE
:
1793 switch (event_param
->u
.kretprobe
.entryexit
) {
1794 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
:
1796 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY
:
1798 case LTTNG_KERNEL_ABI_SYSCALL_EXIT
:
1805 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1807 case LTTNG_KERNEL_ABI_KPROBE
:
1809 case LTTNG_KERNEL_ABI_UPROBE
:
1812 case LTTNG_KERNEL_ABI_FUNCTION
:
1814 case LTTNG_KERNEL_ABI_NOOP
:
1823 int lttng_abi_create_event(struct file
*channel_file
,
1824 struct lttng_kernel_abi_event
*event_param
)
1826 const struct file_operations
*fops
;
1827 struct lttng_kernel_channel_buffer
*channel
= channel_file
->private_data
;
1829 struct file
*event_file
;
1832 event_param
->name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
1833 switch (event_param
->instrumentation
) {
1834 case LTTNG_KERNEL_ABI_KRETPROBE
:
1835 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
1837 case LTTNG_KERNEL_ABI_KPROBE
:
1838 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
1840 case LTTNG_KERNEL_ABI_FUNCTION
:
1842 /* Not implemented. */
1848 switch (event_param
->instrumentation
) {
1849 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1851 case LTTNG_KERNEL_ABI_SYSCALL
:
1852 fops
= <tng_event_recorder_enabler_fops
;
1854 case LTTNG_KERNEL_ABI_KPROBE
:
1856 case LTTNG_KERNEL_ABI_KRETPROBE
:
1858 case LTTNG_KERNEL_ABI_UPROBE
:
1859 fops
= <tng_event_recorder_event_fops
;
1862 case LTTNG_KERNEL_ABI_FUNCTION
:
1864 case LTTNG_KERNEL_ABI_NOOP
:
1870 event_fd
= lttng_get_unused_fd();
1875 event_file
= anon_inode_getfile("[lttng_event]",
1876 fops
, NULL
, O_RDWR
);
1877 if (IS_ERR(event_file
)) {
1878 ret
= PTR_ERR(event_file
);
1881 /* The event holds a reference on the channel */
1882 if (!atomic_long_add_unless(&channel_file
->f_count
, 1, LONG_MAX
)) {
1884 goto refcount_error
;
1886 ret
= lttng_abi_validate_event_param(event_param
);
1890 switch (event_param
->instrumentation
) {
1891 case LTTNG_KERNEL_ABI_TRACEPOINT
:
1893 case LTTNG_KERNEL_ABI_SYSCALL
:
1895 struct lttng_event_enabler
*event_enabler
;
1897 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1899 * If the event name is a star globbing pattern,
1900 * we create the special star globbing enabler.
1902 event_enabler
= lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB
,
1903 event_param
, channel
);
1905 event_enabler
= lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME
,
1906 event_param
, channel
);
1908 priv
= event_enabler
;
1912 case LTTNG_KERNEL_ABI_KPROBE
:
1914 case LTTNG_KERNEL_ABI_KRETPROBE
:
1916 case LTTNG_KERNEL_ABI_UPROBE
:
1918 struct lttng_kernel_event_recorder
*event
;
1921 * We tolerate no failure path after event creation. It
1922 * will stay invariant for the rest of the session.
1924 event
= lttng_kernel_event_recorder_create(channel
, event_param
,
1925 NULL
, event_param
->instrumentation
);
1926 WARN_ON_ONCE(!event
);
1927 if (IS_ERR(event
)) {
1928 ret
= PTR_ERR(event
);
1935 case LTTNG_KERNEL_ABI_FUNCTION
:
1937 case LTTNG_KERNEL_ABI_NOOP
:
1943 event_file
->private_data
= priv
;
1944 fd_install(event_fd
, event_file
);
1948 atomic_long_dec(&channel_file
->f_count
);
1952 put_unused_fd(event_fd
);
1958 long lttng_event_notifier_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1960 struct lttng_kernel_event_notifier
*event_notifier
= file
->private_data
;
1963 case LTTNG_KERNEL_ABI_ENABLE
:
1964 return lttng_event_enable(&event_notifier
->parent
);
1965 case LTTNG_KERNEL_ABI_DISABLE
:
1966 return lttng_event_disable(&event_notifier
->parent
);
1967 case LTTNG_KERNEL_ABI_FILTER
:
1969 case LTTNG_KERNEL_ABI_CAPTURE
:
1971 case LTTNG_KERNEL_ABI_ADD_CALLSITE
:
1972 return lttng_event_add_callsite(&event_notifier
->parent
,
1973 (struct lttng_kernel_abi_event_callsite __user
*) arg
);
1975 return -ENOIOCTLCMD
;
1980 long lttng_event_notifier_enabler_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1982 struct lttng_event_notifier_enabler
*event_notifier_enabler
= file
->private_data
;
1985 case LTTNG_KERNEL_ABI_ENABLE
:
1986 return lttng_event_notifier_enabler_enable(event_notifier_enabler
);
1987 case LTTNG_KERNEL_ABI_DISABLE
:
1988 return lttng_event_notifier_enabler_disable(event_notifier_enabler
);
1989 case LTTNG_KERNEL_ABI_FILTER
:
1990 return lttng_event_notifier_enabler_attach_filter_bytecode(
1991 event_notifier_enabler
,
1992 (struct lttng_kernel_abi_filter_bytecode __user
*) arg
);
1993 case LTTNG_KERNEL_ABI_CAPTURE
:
1994 return lttng_event_notifier_enabler_attach_capture_bytecode(
1995 event_notifier_enabler
,
1996 (struct lttng_kernel_abi_capture_bytecode __user
*) arg
);
1997 case LTTNG_KERNEL_ABI_ADD_CALLSITE
:
2000 return -ENOIOCTLCMD
;
2005 int lttng_event_notifier_event_release(struct inode
*inode
, struct file
*file
)
2007 struct lttng_kernel_event_notifier
*event_notifier
= file
->private_data
;
2010 fput(event_notifier
->priv
->group
->file
);
2015 int lttng_event_notifier_enabler_release(struct inode
*inode
, struct file
*file
)
2017 struct lttng_event_notifier_enabler
*event_notifier_enabler
= file
->private_data
;
2019 if (event_notifier_enabler
)
2020 fput(event_notifier_enabler
->group
->file
);
2024 static const struct file_operations lttng_event_notifier_event_fops
= {
2025 .owner
= THIS_MODULE
,
2026 .release
= lttng_event_notifier_event_release
,
2027 .unlocked_ioctl
= lttng_event_notifier_event_ioctl
,
2028 #ifdef CONFIG_COMPAT
2029 .compat_ioctl
= lttng_event_notifier_event_ioctl
,
2033 static const struct file_operations lttng_event_notifier_enabler_fops
= {
2034 .owner
= THIS_MODULE
,
2035 .release
= lttng_event_notifier_enabler_release
,
2036 .unlocked_ioctl
= lttng_event_notifier_enabler_ioctl
,
2037 #ifdef CONFIG_COMPAT
2038 .compat_ioctl
= lttng_event_notifier_enabler_ioctl
,
2043 int lttng_abi_create_event_notifier(struct file
*event_notifier_group_file
,
2044 struct lttng_kernel_abi_event_notifier
*event_notifier_param
)
2046 struct lttng_event_notifier_group
*event_notifier_group
=
2047 event_notifier_group_file
->private_data
;
2048 const struct file_operations
*fops
;
2049 int event_notifier_fd
, ret
;
2050 struct file
*event_notifier_file
;
2053 switch (event_notifier_param
->event
.instrumentation
) {
2054 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2055 case LTTNG_KERNEL_ABI_UPROBE
:
2057 case LTTNG_KERNEL_ABI_KPROBE
:
2058 event_notifier_param
->event
.u
.kprobe
.symbol_name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
2060 case LTTNG_KERNEL_ABI_SYSCALL
:
2062 case LTTNG_KERNEL_ABI_KRETPROBE
:
2063 /* Placing an event notifier on kretprobe is not supported. */
2064 case LTTNG_KERNEL_ABI_FUNCTION
:
2065 case LTTNG_KERNEL_ABI_NOOP
:
2071 switch (event_notifier_param
->event
.instrumentation
) {
2072 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2074 case LTTNG_KERNEL_ABI_SYSCALL
:
2075 fops
= <tng_event_notifier_enabler_fops
;
2077 case LTTNG_KERNEL_ABI_KPROBE
:
2079 case LTTNG_KERNEL_ABI_KRETPROBE
:
2081 case LTTNG_KERNEL_ABI_UPROBE
:
2082 fops
= <tng_event_notifier_event_fops
;
2085 case LTTNG_KERNEL_ABI_FUNCTION
:
2087 case LTTNG_KERNEL_ABI_NOOP
:
2094 event_notifier_param
->event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
2096 event_notifier_fd
= lttng_get_unused_fd();
2097 if (event_notifier_fd
< 0) {
2098 ret
= event_notifier_fd
;
2102 event_notifier_file
= anon_inode_getfile("[lttng_event_notifier]",
2103 fops
, NULL
, O_RDWR
);
2104 if (IS_ERR(event_notifier_file
)) {
2105 ret
= PTR_ERR(event_notifier_file
);
2109 /* The event notifier holds a reference on the event notifier group. */
2110 if (!atomic_long_add_unless(&event_notifier_group_file
->f_count
, 1, LONG_MAX
)) {
2112 goto refcount_error
;
2115 ret
= lttng_abi_validate_event_param(&event_notifier_param
->event
);
2117 goto event_notifier_error
;
2119 switch (event_notifier_param
->event
.instrumentation
) {
2120 case LTTNG_KERNEL_ABI_TRACEPOINT
:
2122 case LTTNG_KERNEL_ABI_SYSCALL
:
2124 struct lttng_event_notifier_enabler
*enabler
;
2126 if (strutils_is_star_glob_pattern(event_notifier_param
->event
.name
)) {
2128 * If the event name is a star globbing pattern,
2129 * we create the special star globbing enabler.
2131 enabler
= lttng_event_notifier_enabler_create(
2132 event_notifier_group
,
2133 LTTNG_ENABLER_FORMAT_STAR_GLOB
,
2134 event_notifier_param
);
2136 enabler
= lttng_event_notifier_enabler_create(
2137 event_notifier_group
,
2138 LTTNG_ENABLER_FORMAT_NAME
,
2139 event_notifier_param
);
2145 case LTTNG_KERNEL_ABI_KPROBE
:
2147 case LTTNG_KERNEL_ABI_KRETPROBE
:
2149 case LTTNG_KERNEL_ABI_UPROBE
:
2151 struct lttng_kernel_event_notifier
*event_notifier
;
2154 * We tolerate no failure path after event notifier creation.
2155 * It will stay invariant for the rest of the session.
2157 event_notifier
= lttng_event_notifier_create(NULL
,
2158 event_notifier_param
->event
.token
,
2159 event_notifier_param
->error_counter_index
,
2160 event_notifier_group
,
2161 event_notifier_param
,
2162 event_notifier_param
->event
.instrumentation
);
2163 WARN_ON_ONCE(!event_notifier
);
2164 if (IS_ERR(event_notifier
)) {
2165 ret
= PTR_ERR(event_notifier
);
2166 goto event_notifier_error
;
2168 priv
= event_notifier
;
2172 case LTTNG_KERNEL_ABI_FUNCTION
:
2174 case LTTNG_KERNEL_ABI_NOOP
:
2178 goto event_notifier_error
;
2180 event_notifier_file
->private_data
= priv
;
2181 fd_install(event_notifier_fd
, event_notifier_file
);
2182 return event_notifier_fd
;
2184 event_notifier_error
:
2185 atomic_long_dec(&event_notifier_group_file
->f_count
);
2187 fput(event_notifier_file
);
2189 put_unused_fd(event_notifier_fd
);
2196 long lttng_abi_event_notifier_group_create_error_counter(
2197 struct file
*event_notifier_group_file
,
2198 const struct lttng_kernel_abi_counter_conf
*error_counter_conf
)
2200 int counter_fd
, ret
;
2201 char *counter_transport_name
;
2203 struct lttng_counter
*counter
= NULL
;
2204 struct file
*counter_file
;
2205 struct lttng_event_notifier_group
*event_notifier_group
=
2206 (struct lttng_event_notifier_group
*) event_notifier_group_file
->private_data
;
2208 if (error_counter_conf
->arithmetic
!= LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR
) {
2209 printk(KERN_ERR
"LTTng: event_notifier: Error counter of the wrong arithmetic type.\n");
2213 if (error_counter_conf
->number_dimensions
!= 1) {
2214 printk(KERN_ERR
"LTTng: event_notifier: Error counter has more than one dimension.\n");
2218 switch (error_counter_conf
->bitness
) {
2219 case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64
:
2220 counter_transport_name
= "counter-per-cpu-64-modular";
2222 case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32
:
2223 counter_transport_name
= "counter-per-cpu-32-modular";
2230 * Lock sessions to provide mutual exclusion against concurrent
2231 * modification of event_notifier group, which would result in
2232 * overwriting the error counter if set concurrently.
2234 lttng_lock_sessions();
2236 if (event_notifier_group
->error_counter
) {
2237 printk(KERN_ERR
"Error counter already created in event_notifier group\n");
2242 counter_fd
= lttng_get_unused_fd();
2243 if (counter_fd
< 0) {
2248 counter_file
= anon_inode_getfile("[lttng_counter]",
2249 <tng_counter_fops
,
2251 if (IS_ERR(counter_file
)) {
2252 ret
= PTR_ERR(counter_file
);
2256 counter_len
= error_counter_conf
->dimensions
[0].size
;
2258 if (!atomic_long_add_unless(&event_notifier_group_file
->f_count
, 1, LONG_MAX
)) {
2260 goto refcount_error
;
2263 counter
= lttng_kernel_counter_create(counter_transport_name
,
2270 event_notifier_group
->error_counter_len
= counter_len
;
2272 * store-release to publish error counter matches load-acquire
2273 * in record_error. Ensures the counter is created and the
2274 * error_counter_len is set before they are used.
2276 lttng_smp_store_release(&event_notifier_group
->error_counter
, counter
);
2278 counter
->file
= counter_file
;
2279 counter
->owner
= event_notifier_group
->file
;
2280 counter_file
->private_data
= counter
;
2281 /* Ownership transferred. */
2284 fd_install(counter_fd
, counter_file
);
2285 lttng_unlock_sessions();
2290 atomic_long_dec(&event_notifier_group_file
->f_count
);
2294 put_unused_fd(counter_fd
);
2296 lttng_unlock_sessions();
2301 long lttng_event_notifier_group_ioctl(struct file
*file
, unsigned int cmd
,
2305 case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD
:
2307 return lttng_abi_open_event_notifier_group_stream(file
);
2309 case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE
:
2311 struct lttng_kernel_abi_event_notifier uevent_notifier_param
;
2313 if (copy_from_user(&uevent_notifier_param
,
2314 (struct lttng_kernel_abi_event_notifier __user
*) arg
,
2315 sizeof(uevent_notifier_param
)))
2317 return lttng_abi_create_event_notifier(file
, &uevent_notifier_param
);
2319 case LTTNG_KERNEL_ABI_COUNTER
:
2321 struct lttng_kernel_abi_counter_conf uerror_counter_conf
;
2323 if (copy_from_user(&uerror_counter_conf
,
2324 (struct lttng_kernel_abi_counter_conf __user
*) arg
,
2325 sizeof(uerror_counter_conf
)))
2327 return lttng_abi_event_notifier_group_create_error_counter(file
,
2328 &uerror_counter_conf
);
2331 return -ENOIOCTLCMD
;
2337 int lttng_event_notifier_group_release(struct inode
*inode
, struct file
*file
)
2339 struct lttng_event_notifier_group
*event_notifier_group
=
2342 if (event_notifier_group
)
2343 lttng_event_notifier_group_destroy(event_notifier_group
);
2347 static const struct file_operations lttng_event_notifier_group_fops
= {
2348 .owner
= THIS_MODULE
,
2349 .release
= lttng_event_notifier_group_release
,
2350 .unlocked_ioctl
= lttng_event_notifier_group_ioctl
,
2351 #ifdef CONFIG_COMPAT
2352 .compat_ioctl
= lttng_event_notifier_group_ioctl
,
2357 * lttng_channel_ioctl - lttng syscall through ioctl
2363 * This ioctl implements lttng commands:
2364 * LTTNG_KERNEL_ABI_STREAM
2365 * Returns an event stream file descriptor or failure.
2366 * (typically, one event stream records events from one CPU)
2367 * LTTNG_KERNEL_ABI_EVENT
2368 * Returns an event file descriptor or failure.
2369 * LTTNG_KERNEL_ABI_CONTEXT
2370 * Prepend a context field to each event in the channel
2371 * LTTNG_KERNEL_ABI_ENABLE
2372 * Enable recording for events in this channel (weak enable)
2373 * LTTNG_KERNEL_ABI_DISABLE
2374 * Disable recording for events in this channel (strong disable)
2376 * Channel and event file descriptors also hold a reference on the session.
2379 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2381 struct lttng_kernel_channel_buffer
*channel
= file
->private_data
;
2384 case LTTNG_KERNEL_ABI_OLD_STREAM
:
2385 case LTTNG_KERNEL_ABI_STREAM
:
2386 return lttng_abi_open_stream(file
);
2387 case LTTNG_KERNEL_ABI_OLD_EVENT
:
2389 struct lttng_kernel_abi_event
*uevent_param
;
2390 struct lttng_kernel_abi_old_event
*old_uevent_param
;
2393 uevent_param
= kmalloc(sizeof(struct lttng_kernel_abi_event
),
2395 if (!uevent_param
) {
2399 old_uevent_param
= kmalloc(
2400 sizeof(struct lttng_kernel_abi_old_event
),
2402 if (!old_uevent_param
) {
2404 goto old_event_error_free_param
;
2406 if (copy_from_user(old_uevent_param
,
2407 (struct lttng_kernel_abi_old_event __user
*) arg
,
2408 sizeof(struct lttng_kernel_abi_old_event
))) {
2410 goto old_event_error_free_old_param
;
2413 memcpy(uevent_param
->name
, old_uevent_param
->name
,
2414 sizeof(uevent_param
->name
));
2415 uevent_param
->instrumentation
=
2416 old_uevent_param
->instrumentation
;
2418 switch (old_uevent_param
->instrumentation
) {
2419 case LTTNG_KERNEL_ABI_KPROBE
:
2420 uevent_param
->u
.kprobe
.addr
=
2421 old_uevent_param
->u
.kprobe
.addr
;
2422 uevent_param
->u
.kprobe
.offset
=
2423 old_uevent_param
->u
.kprobe
.offset
;
2424 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
2425 old_uevent_param
->u
.kprobe
.symbol_name
,
2426 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
2428 case LTTNG_KERNEL_ABI_KRETPROBE
:
2429 uevent_param
->u
.kretprobe
.addr
=
2430 old_uevent_param
->u
.kretprobe
.addr
;
2431 uevent_param
->u
.kretprobe
.offset
=
2432 old_uevent_param
->u
.kretprobe
.offset
;
2433 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
2434 old_uevent_param
->u
.kretprobe
.symbol_name
,
2435 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
2437 case LTTNG_KERNEL_ABI_FUNCTION
:
2439 /* Not implemented. */
2444 ret
= lttng_abi_create_event(file
, uevent_param
);
2446 old_event_error_free_old_param
:
2447 kfree(old_uevent_param
);
2448 old_event_error_free_param
:
2449 kfree(uevent_param
);
2453 case LTTNG_KERNEL_ABI_EVENT
:
2455 struct lttng_kernel_abi_event uevent_param
;
2457 if (copy_from_user(&uevent_param
,
2458 (struct lttng_kernel_abi_event __user
*) arg
,
2459 sizeof(uevent_param
)))
2461 return lttng_abi_create_event(file
, &uevent_param
);
2463 case LTTNG_KERNEL_ABI_OLD_CONTEXT
:
2465 struct lttng_kernel_abi_context
*ucontext_param
;
2466 struct lttng_kernel_abi_old_context
*old_ucontext_param
;
2469 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_abi_context
),
2471 if (!ucontext_param
) {
2475 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_abi_old_context
),
2477 if (!old_ucontext_param
) {
2479 goto old_ctx_error_free_param
;
2482 if (copy_from_user(old_ucontext_param
,
2483 (struct lttng_kernel_abi_old_context __user
*) arg
,
2484 sizeof(struct lttng_kernel_abi_old_context
))) {
2486 goto old_ctx_error_free_old_param
;
2488 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
2489 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
2490 sizeof(ucontext_param
->padding
));
2491 /* only type that uses the union */
2492 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER
) {
2493 ucontext_param
->u
.perf_counter
.type
=
2494 old_ucontext_param
->u
.perf_counter
.type
;
2495 ucontext_param
->u
.perf_counter
.config
=
2496 old_ucontext_param
->u
.perf_counter
.config
;
2497 memcpy(ucontext_param
->u
.perf_counter
.name
,
2498 old_ucontext_param
->u
.perf_counter
.name
,
2499 sizeof(ucontext_param
->u
.perf_counter
.name
));
2502 ret
= lttng_abi_add_context(file
,
2504 &channel
->priv
->ctx
, channel
->parent
.session
);
2506 old_ctx_error_free_old_param
:
2507 kfree(old_ucontext_param
);
2508 old_ctx_error_free_param
:
2509 kfree(ucontext_param
);
2513 case LTTNG_KERNEL_ABI_CONTEXT
:
2515 struct lttng_kernel_abi_context ucontext_param
;
2517 if (copy_from_user(&ucontext_param
,
2518 (struct lttng_kernel_abi_context __user
*) arg
,
2519 sizeof(ucontext_param
)))
2521 return lttng_abi_add_context(file
,
2523 &channel
->priv
->ctx
, channel
->parent
.session
);
2525 case LTTNG_KERNEL_ABI_OLD_ENABLE
:
2526 case LTTNG_KERNEL_ABI_ENABLE
:
2527 return lttng_channel_enable(channel
);
2528 case LTTNG_KERNEL_ABI_OLD_DISABLE
:
2529 case LTTNG_KERNEL_ABI_DISABLE
:
2530 return lttng_channel_disable(channel
);
2531 case LTTNG_KERNEL_ABI_SYSCALL_MASK
:
2532 return lttng_channel_syscall_mask(channel
,
2533 (struct lttng_kernel_abi_syscall_mask __user
*) arg
);
2535 return -ENOIOCTLCMD
;
2540 * lttng_metadata_ioctl - lttng syscall through ioctl
2546 * This ioctl implements lttng commands:
2547 * LTTNG_KERNEL_ABI_STREAM
2548 * Returns an event stream file descriptor or failure.
2550 * Channel and event file descriptors also hold a reference on the session.
2553 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2556 case LTTNG_KERNEL_ABI_OLD_STREAM
:
2557 case LTTNG_KERNEL_ABI_STREAM
:
2558 return lttng_abi_open_metadata_stream(file
);
2560 return -ENOIOCTLCMD
;
2565 * lttng_channel_poll - lttng stream addition/removal monitoring
2570 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
2572 struct lttng_kernel_channel_buffer
*channel
= file
->private_data
;
2573 unsigned int mask
= 0;
2575 if (file
->f_mode
& FMODE_READ
) {
2576 poll_wait_set_exclusive(wait
);
2577 poll_wait(file
, channel
->ops
->priv
->get_hp_wait_queue(channel
->priv
->rb_chan
),
2580 if (channel
->ops
->priv
->is_disabled(channel
->priv
->rb_chan
))
2582 if (channel
->ops
->priv
->is_finalized(channel
->priv
->rb_chan
))
2584 if (channel
->ops
->priv
->buffer_has_read_closed_stream(channel
->priv
->rb_chan
))
2585 return POLLIN
| POLLRDNORM
;
2593 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
2595 struct lttng_kernel_channel_buffer
*channel
= file
->private_data
;
2598 fput(channel
->parent
.session
->priv
->file
);
2603 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
2605 struct lttng_kernel_channel_buffer
*channel
= file
->private_data
;
2608 fput(channel
->parent
.session
->priv
->file
);
2609 lttng_metadata_channel_destroy(channel
);
2615 static const struct file_operations lttng_channel_fops
= {
2616 .owner
= THIS_MODULE
,
2617 .release
= lttng_channel_release
,
2618 .poll
= lttng_channel_poll
,
2619 .unlocked_ioctl
= lttng_channel_ioctl
,
2620 #ifdef CONFIG_COMPAT
2621 .compat_ioctl
= lttng_channel_ioctl
,
2625 static const struct file_operations lttng_metadata_fops
= {
2626 .owner
= THIS_MODULE
,
2627 .release
= lttng_metadata_channel_release
,
2628 .unlocked_ioctl
= lttng_metadata_ioctl
,
2629 #ifdef CONFIG_COMPAT
2630 .compat_ioctl
= lttng_metadata_ioctl
,
2635 * lttng_event_recorder_event_ioctl - lttng syscall through ioctl
2641 * This ioctl implements lttng commands:
2642 * LTTNG_KERNEL_ABI_CONTEXT
2643 * Prepend a context field to each record of this event
2644 * LTTNG_KERNEL_ABI_ENABLE
2645 * Enable recording for this event (weak enable)
2646 * LTTNG_KERNEL_ABI_DISABLE
2647 * Disable recording for this event (strong disable)
2650 long lttng_event_recorder_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2652 struct lttng_kernel_event_recorder
*event_recorder
= file
->private_data
;
2655 case LTTNG_KERNEL_ABI_OLD_CONTEXT
:
2657 /* Not implemented */
2660 case LTTNG_KERNEL_ABI_CONTEXT
:
2662 /* Not implemented */
2665 case LTTNG_KERNEL_ABI_OLD_ENABLE
:
2666 case LTTNG_KERNEL_ABI_ENABLE
:
2667 return lttng_event_enable(&event_recorder
->parent
);
2668 case LTTNG_KERNEL_ABI_OLD_DISABLE
:
2669 case LTTNG_KERNEL_ABI_DISABLE
:
2670 return lttng_event_disable(&event_recorder
->parent
);
2671 case LTTNG_KERNEL_ABI_FILTER
:
2673 case LTTNG_KERNEL_ABI_ADD_CALLSITE
:
2674 return lttng_event_add_callsite(&event_recorder
->parent
,
2675 (struct lttng_kernel_abi_event_callsite __user
*) arg
);
2677 return -ENOIOCTLCMD
;
2682 * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl
2688 * This ioctl implements lttng commands:
2689 * LTTNG_KERNEL_ABI_CONTEXT
2690 * Prepend a context field to each record of this event
2691 * LTTNG_KERNEL_ABI_ENABLE
2692 * Enable recording for this event (weak enable)
2693 * LTTNG_KERNEL_ABI_DISABLE
2694 * Disable recording for this event (strong disable)
2697 long lttng_event_recorder_enabler_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2699 struct lttng_event_enabler
*event_enabler
= file
->private_data
;
2702 case LTTNG_KERNEL_ABI_OLD_CONTEXT
:
2704 /* Not implemented */
2707 case LTTNG_KERNEL_ABI_CONTEXT
:
2709 /* Not implemented */
2712 case LTTNG_KERNEL_ABI_OLD_ENABLE
:
2713 case LTTNG_KERNEL_ABI_ENABLE
:
2714 return lttng_event_enabler_enable(event_enabler
);
2715 case LTTNG_KERNEL_ABI_OLD_DISABLE
:
2716 case LTTNG_KERNEL_ABI_DISABLE
:
2717 return lttng_event_enabler_disable(event_enabler
);
2718 case LTTNG_KERNEL_ABI_FILTER
:
2719 return lttng_event_enabler_attach_filter_bytecode(
2721 (struct lttng_kernel_abi_filter_bytecode __user
*) arg
);
2722 case LTTNG_KERNEL_ABI_ADD_CALLSITE
:
2725 return -ENOIOCTLCMD
;
2730 int lttng_event_recorder_event_release(struct inode
*inode
, struct file
*file
)
2732 struct lttng_kernel_event_recorder
*event
= file
->private_data
;
2735 fput(event
->chan
->priv
->parent
.file
);
2740 int lttng_event_recorder_enabler_release(struct inode
*inode
, struct file
*file
)
2742 struct lttng_event_enabler
*event_enabler
= file
->private_data
;
2745 fput(event_enabler
->chan
->priv
->parent
.file
);
2749 static const struct file_operations lttng_event_recorder_event_fops
= {
2750 .owner
= THIS_MODULE
,
2751 .release
= lttng_event_recorder_event_release
,
2752 .unlocked_ioctl
= lttng_event_recorder_event_ioctl
,
2753 #ifdef CONFIG_COMPAT
2754 .compat_ioctl
= lttng_event_recorder_event_ioctl
,
2758 static const struct file_operations lttng_event_recorder_enabler_fops
= {
2759 .owner
= THIS_MODULE
,
2760 .release
= lttng_event_recorder_enabler_release
,
2761 .unlocked_ioctl
= lttng_event_recorder_enabler_ioctl
,
2762 #ifdef CONFIG_COMPAT
2763 .compat_ioctl
= lttng_event_recorder_enabler_ioctl
,
2767 static int put_u64(uint64_t val
, unsigned long arg
)
2769 return put_user(val
, (uint64_t __user
*) arg
);
2772 static int put_u32(uint32_t val
, unsigned long arg
)
2774 return put_user(val
, (uint32_t __user
*) arg
);
2777 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
2778 unsigned int cmd
, unsigned long arg
)
2780 struct lttng_kernel_ring_buffer
*buf
= filp
->private_data
;
2781 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
2782 const struct lttng_kernel_ring_buffer_config
*config
= &chan
->backend
.config
;
2783 const struct lttng_kernel_channel_buffer_ops
*ops
= chan
->backend
.priv_ops
;
2786 if (atomic_read(&chan
->record_disabled
))
2790 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
2794 ret
= ops
->priv
->timestamp_begin(config
, buf
, &ts
);
2797 return put_u64(ts
, arg
);
2799 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END
:
2803 ret
= ops
->priv
->timestamp_end(config
, buf
, &ts
);
2806 return put_u64(ts
, arg
);
2808 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED
:
2812 ret
= ops
->priv
->events_discarded(config
, buf
, &ed
);
2815 return put_u64(ed
, arg
);
2817 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE
:
2821 ret
= ops
->priv
->content_size(config
, buf
, &cs
);
2824 return put_u64(cs
, arg
);
2826 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE
:
2830 ret
= ops
->priv
->packet_size(config
, buf
, &ps
);
2833 return put_u64(ps
, arg
);
2835 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID
:
2839 ret
= ops
->priv
->stream_id(config
, buf
, &si
);
2842 return put_u64(si
, arg
);
2844 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
2848 ret
= ops
->priv
->current_timestamp(config
, buf
, &ts
);
2851 return put_u64(ts
, arg
);
2853 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM
:
2857 ret
= ops
->priv
->sequence_number(config
, buf
, &seq
);
2860 return put_u64(seq
, arg
);
2862 case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID
:
2866 ret
= ops
->priv
->instance_id(config
, buf
, &id
);
2869 return put_u64(id
, arg
);
2872 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
2880 #ifdef CONFIG_COMPAT
2881 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
2882 unsigned int cmd
, unsigned long arg
)
2884 struct lttng_kernel_ring_buffer
*buf
= filp
->private_data
;
2885 struct lttng_kernel_ring_buffer_channel
*chan
= buf
->backend
.chan
;
2886 const struct lttng_kernel_ring_buffer_config
*config
= &chan
->backend
.config
;
2887 const struct lttng_kernel_channel_buffer_ops
*ops
= chan
->backend
.priv_ops
;
2890 if (atomic_read(&chan
->record_disabled
))
2894 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
2898 ret
= ops
->priv
->timestamp_begin(config
, buf
, &ts
);
2901 return put_u64(ts
, arg
);
2903 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
2907 ret
= ops
->priv
->timestamp_end(config
, buf
, &ts
);
2910 return put_u64(ts
, arg
);
2912 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
2916 ret
= ops
->priv
->events_discarded(config
, buf
, &ed
);
2919 return put_u64(ed
, arg
);
2921 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
2925 ret
= ops
->priv
->content_size(config
, buf
, &cs
);
2928 return put_u64(cs
, arg
);
2930 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
2934 ret
= ops
->priv
->packet_size(config
, buf
, &ps
);
2937 return put_u64(ps
, arg
);
2939 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID
:
2943 ret
= ops
->priv
->stream_id(config
, buf
, &si
);
2946 return put_u64(si
, arg
);
2948 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
2952 ret
= ops
->priv
->current_timestamp(config
, buf
, &ts
);
2955 return put_u64(ts
, arg
);
2957 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
2961 ret
= ops
->priv
->sequence_number(config
, buf
, &seq
);
2964 return put_u64(seq
, arg
);
2966 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID
:
2970 ret
= ops
->priv
->instance_id(config
, buf
, &id
);
2973 return put_u64(id
, arg
);
2976 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
2983 #endif /* CONFIG_COMPAT */
2985 static void lttng_stream_override_ring_buffer_fops(void)
2987 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
2988 lttng_stream_ring_buffer_file_operations
.open
=
2989 lib_ring_buffer_file_operations
.open
;
2990 lttng_stream_ring_buffer_file_operations
.release
=
2991 lib_ring_buffer_file_operations
.release
;
2992 lttng_stream_ring_buffer_file_operations
.poll
=
2993 lib_ring_buffer_file_operations
.poll
;
2994 lttng_stream_ring_buffer_file_operations
.splice_read
=
2995 lib_ring_buffer_file_operations
.splice_read
;
2996 lttng_stream_ring_buffer_file_operations
.mmap
=
2997 lib_ring_buffer_file_operations
.mmap
;
2998 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
2999 lttng_stream_ring_buffer_ioctl
;
3000 lttng_stream_ring_buffer_file_operations
.llseek
=
3001 lib_ring_buffer_file_operations
.llseek
;
3002 #ifdef CONFIG_COMPAT
3003 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
3004 lttng_stream_ring_buffer_compat_ioctl
;
3008 int __init
lttng_abi_init(void)
3012 wrapper_vmalloc_sync_mappings();
3015 ret
= lttng_tp_mempool_init();
3020 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
3021 <tng_proc_ops
, NULL
);
3023 if (!lttng_proc_dentry
) {
3024 printk(KERN_ERR
"LTTng: Error creating control file\n");
3028 lttng_stream_override_ring_buffer_fops();
3032 lttng_tp_mempool_destroy();
3033 lttng_clock_unref();
3037 /* No __exit annotation because used by init error path too. */
3038 void lttng_abi_exit(void)
3040 lttng_tp_mempool_destroy();
3041 lttng_clock_unref();
3042 if (lttng_proc_dentry
)
3043 remove_proc_entry("lttng", NULL
);