summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/i915_query.c
blob: 3ace929dd90ff34a53aace9ac92c57edd33bd57d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright © 2018 Intel Corporation
 */

#include "i915_drv.h"
#include "i915_query.h"
#include <uapi/drm/i915_drm.h>

static int query_topology_info(struct drm_i915_private *dev_priv,
			       struct drm_i915_query_item *query_item)
{
	const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu;
	struct drm_i915_query_topology_info topo;
	u32 slice_length, subslice_length, eu_length, total_length;

	if (query_item->flags != 0)
		return -EINVAL;

	if (sseu->max_slices == 0)
		return -ENODEV;

	BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask));

	slice_length = sizeof(sseu->slice_mask);
	subslice_length = sseu->max_slices *
		DIV_ROUND_UP(sseu->max_subslices,
			     sizeof(sseu->subslice_mask[0]) * BITS_PER_BYTE);
	eu_length = sseu->max_slices * sseu->max_subslices *
		DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);

	total_length = sizeof(topo) + slice_length + subslice_length + eu_length;

	if (query_item->length == 0)
		return total_length;

	if (query_item->length < total_length)
		return -EINVAL;

	if (copy_from_user(&topo, u64_to_user_ptr(query_item->data_ptr),
			   sizeof(topo)))
		return -EFAULT;

	if (topo.flags != 0)
		return -EINVAL;

	if (!access_ok(VERIFY_WRITE, u64_to_user_ptr(query_item->data_ptr),
		       total_length))
		return -EFAULT;

	memset(&topo, 0, sizeof(topo));
	topo.max_slices = sseu->max_slices;
	topo.max_subslices = sseu->max_subslices;
	topo.max_eus_per_subslice = sseu->max_eus_per_subslice;

	topo.subslice_offset = slice_length;
	topo.subslice_stride = DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE);
	topo.eu_offset = slice_length + subslice_length;
	topo.eu_stride =
		DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);

	if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr),
			   &topo, sizeof(topo)))
		return -EFAULT;

	if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + sizeof(topo)),
			   &sseu->slice_mask, slice_length))
		return -EFAULT;

	if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr +
					   sizeof(topo) + slice_length),
			   sseu->subslice_mask, subslice_length))
		return -EFAULT;

	if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr +
					   sizeof(topo) +
					   slice_length + subslice_length),
			   sseu->eu_mask, eu_length))
		return -EFAULT;

	return total_length;
}

static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
					struct drm_i915_query_item *query_item) = {
	query_topology_info,
};

int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	struct drm_i915_query *args = data;
	struct drm_i915_query_item __user *user_item_ptr =
		u64_to_user_ptr(args->items_ptr);
	u32 i;

	if (args->flags != 0)
		return -EINVAL;

	for (i = 0; i < args->num_items; i++, user_item_ptr++) {
		struct drm_i915_query_item item;
		u64 func_idx;
		int ret;

		if (copy_from_user(&item, user_item_ptr, sizeof(item)))
			return -EFAULT;

		if (item.query_id == 0)
			return -EINVAL;

		func_idx = item.query_id - 1;

		if (func_idx < ARRAY_SIZE(i915_query_funcs))
			ret = i915_query_funcs[func_idx](dev_priv, &item);
		else
			ret = -EINVAL;

		/* Only write the length back to userspace if they differ. */
		if (ret != item.length && put_user(ret, &user_item_ptr->length))
			return -EFAULT;
	}

	return 0;
}