tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_eu_stall.h"
12#include "xe_oa.h"
13#include "xe_observation.h"
14
15u32 xe_observation_paranoid = true;
16static struct ctl_table_header *sysctl_header;
17
18static int xe_oa_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg,
19 struct drm_file *file)
20{
21 switch (arg->observation_op) {
22 case DRM_XE_OBSERVATION_OP_STREAM_OPEN:
23 return xe_oa_stream_open_ioctl(dev, arg->param, file);
24 case DRM_XE_OBSERVATION_OP_ADD_CONFIG:
25 return xe_oa_add_config_ioctl(dev, arg->param, file);
26 case DRM_XE_OBSERVATION_OP_REMOVE_CONFIG:
27 return xe_oa_remove_config_ioctl(dev, arg->param, file);
28 default:
29 return -EINVAL;
30 }
31}
32
33static int xe_eu_stall_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg,
34 struct drm_file *file)
35{
36 switch (arg->observation_op) {
37 case DRM_XE_OBSERVATION_OP_STREAM_OPEN:
38 return xe_eu_stall_stream_open(dev, arg->param, file);
39 default:
40 return -EINVAL;
41 }
42}
43
44/**
45 * xe_observation_ioctl - The top level observation layer ioctl
46 * @dev: @drm_device
47 * @data: pointer to struct @drm_xe_observation_param
48 * @file: @drm_file
49 *
50 * The function is called for different observation streams types and
51 * allows execution of different operations supported by those stream
52 * types.
53 *
54 * Return: 0 on success or a negative error code on failure.
55 */
56int xe_observation_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
57{
58 struct drm_xe_observation_param *arg = data;
59
60 if (arg->extensions)
61 return -EINVAL;
62
63 switch (arg->observation_type) {
64 case DRM_XE_OBSERVATION_TYPE_OA:
65 return xe_oa_ioctl(dev, arg, file);
66 case DRM_XE_OBSERVATION_TYPE_EU_STALL:
67 return xe_eu_stall_ioctl(dev, arg, file);
68 default:
69 return -EINVAL;
70 }
71}
72
73static const struct ctl_table observation_ctl_table[] = {
74 {
75 .procname = "observation_paranoid",
76 .data = &xe_observation_paranoid,
77 .maxlen = sizeof(xe_observation_paranoid),
78 .mode = 0644,
79 .proc_handler = proc_dointvec_minmax,
80 .extra1 = SYSCTL_ZERO,
81 .extra2 = SYSCTL_ONE,
82 },
83};
84
85/**
86 * xe_observation_sysctl_register - Register xe_observation_paranoid sysctl
87 *
88 * Normally only superuser/root can access observation stream
89 * data. However, superuser can set xe_observation_paranoid sysctl to 0 to
90 * allow non-privileged users to also access observation data.
91 *
92 * Return: always returns 0
93 */
94int xe_observation_sysctl_register(void)
95{
96 sysctl_header = register_sysctl("dev/xe", observation_ctl_table);
97 return 0;
98}
99
100/**
101 * xe_observation_sysctl_unregister - Unregister xe_observation_paranoid sysctl
102 */
103void xe_observation_sysctl_unregister(void)
104{
105 unregister_sysctl_table(sysctl_header);
106}