1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright © 2023-2024 Intel Corporation
 4 */
 5
 6#include <linux/errno.h>
 7#include <linux/sysctl.h>
 8
 9#include <uapi/drm/xe_drm.h>
10
11#include "xe_oa.h"
12#include "xe_observation.h"
13
14u32 xe_observation_paranoid = true;
15static struct ctl_table_header *sysctl_header;
16
17static int xe_oa_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg,
18		       struct drm_file *file)
19{
20	switch (arg->observation_op) {
21	case DRM_XE_OBSERVATION_OP_STREAM_OPEN:
22		return xe_oa_stream_open_ioctl(dev, arg->param, file);
23	case DRM_XE_OBSERVATION_OP_ADD_CONFIG:
24		return xe_oa_add_config_ioctl(dev, arg->param, file);
25	case DRM_XE_OBSERVATION_OP_REMOVE_CONFIG:
26		return xe_oa_remove_config_ioctl(dev, arg->param, file);
27	default:
28		return -EINVAL;
29	}
30}
31
32/**
33 * xe_observation_ioctl - The top level observation layer ioctl
34 * @dev: @drm_device
35 * @data: pointer to struct @drm_xe_observation_param
36 * @file: @drm_file
37 *
38 * The function is called for different observation streams types and
39 * allows execution of different operations supported by those stream
40 * types.
41 *
42 * Return: 0 on success or a negative error code on failure.
43 */
44int xe_observation_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
45{
46	struct drm_xe_observation_param *arg = data;
47
48	if (arg->extensions)
49		return -EINVAL;
50
51	switch (arg->observation_type) {
52	case DRM_XE_OBSERVATION_TYPE_OA:
53		return xe_oa_ioctl(dev, arg, file);
54	default:
55		return -EINVAL;
56	}
57}
58
59static struct ctl_table observation_ctl_table[] = {
60	{
61	 .procname = "observation_paranoid",
62	 .data = &xe_observation_paranoid,
63	 .maxlen = sizeof(xe_observation_paranoid),
64	 .mode = 0644,
65	 .proc_handler = proc_dointvec_minmax,
66	 .extra1 = SYSCTL_ZERO,
67	 .extra2 = SYSCTL_ONE,
68	 },
69};
70
71/**
72 * xe_observation_sysctl_register - Register xe_observation_paranoid sysctl
73 *
74 * Normally only superuser/root can access observation stream
75 * data. However, superuser can set xe_observation_paranoid sysctl to 0 to
76 * allow non-privileged users to also access observation data.
77 *
78 * Return: always returns 0
79 */
80int xe_observation_sysctl_register(void)
81{
82	sysctl_header = register_sysctl("dev/xe", observation_ctl_table);
83	return 0;
84}
85
86/**
87 * xe_observation_sysctl_unregister - Unregister xe_observation_paranoid sysctl
88 */
89void xe_observation_sysctl_unregister(void)
90{
91	unregister_sysctl_table(sysctl_header);
92}