summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/i915_query.c
blob: 782183b78f49c3ae727ae4dbc8ad75392d229583 (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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright © 2018 Intel Corporation
 */

#include <linux/nospec.h>

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

static int copy_query_item(void *query_hdr, size_t query_sz,
			   u32 total_length,
			   struct drm_i915_query_item *query_item)
{
	if (query_item->length == 0)
		return total_length;

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

	if (copy_from_user(query_hdr, u64_to_user_ptr(query_item->data_ptr),
			   query_sz))
		return -EFAULT;

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

	return 0;
}

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

	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, 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;

	ret = copy_query_item(&topo, sizeof(topo), total_length,
			      query_item);
	if (ret != 0)
		return ret;

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

	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;
		unsigned long func_idx;
		int ret;

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

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

		if (overflows_type(item.query_id - 1, unsigned long))
			return -EINVAL;

		func_idx = item.query_id - 1;

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

		/* 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;
}