xref: /linux/drivers/gpu/drm/xe/xe_observation.c (revision 8e1bb4a41aa78d6105e59186af3dcd545fc66e70)
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 <drm/xe_drm.h>
10 
11 #include "xe_oa.h"
12 #include "xe_observation.h"
13 
14 u32 xe_observation_paranoid = true;
15 static struct ctl_table_header *sysctl_header;
16 
17 static 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  */
44 int 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 
59 static 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 /**
73  * xe_observation_sysctl_register - Register xe_observation_paranoid sysctl
74  *
75  * Normally only superuser/root can access observation stream
76  * data. However, superuser can set xe_observation_paranoid sysctl to 0 to
77  * allow non-privileged users to also access observation data.
78  *
79  * Return: always returns 0
80  */
81 int xe_observation_sysctl_register(void)
82 {
83 	sysctl_header = register_sysctl("dev/xe", observation_ctl_table);
84 	return 0;
85 }
86 
87 /**
88  * xe_observation_sysctl_unregister - Unregister xe_observation_paranoid sysctl
89  */
90 void xe_observation_sysctl_unregister(void)
91 {
92 	unregister_sysctl_table(sysctl_header);
93 }
94