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/*
* 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;
}
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