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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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74f6e18391
In commit 9144d75e22 ("include/linux/bitops.h: introduce BITS_PER_TYPE"),
we made BITS_PER_TYPE available to all and now we can use the macro to
replace some open-coded computation of sizeof(T) * BITS_PER_BYTE.
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180926104707.17410-1-chris@chris-wilson.co.uk
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2018 Intel Corporation
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*/
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#include <linux/nospec.h>
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#include "i915_drv.h"
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#include "i915_query.h"
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#include <uapi/drm/i915_drm.h>
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static int query_topology_info(struct drm_i915_private *dev_priv,
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struct drm_i915_query_item *query_item)
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{
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const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu;
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struct drm_i915_query_topology_info topo;
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u32 slice_length, subslice_length, eu_length, total_length;
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if (query_item->flags != 0)
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return -EINVAL;
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if (sseu->max_slices == 0)
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return -ENODEV;
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BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask));
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slice_length = sizeof(sseu->slice_mask);
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subslice_length = sseu->max_slices *
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DIV_ROUND_UP(sseu->max_subslices,
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BITS_PER_TYPE(sseu->subslice_mask[0]));
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eu_length = sseu->max_slices * sseu->max_subslices *
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DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);
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total_length = sizeof(topo) + slice_length + subslice_length + eu_length;
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if (query_item->length == 0)
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return total_length;
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if (query_item->length < total_length)
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return -EINVAL;
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if (copy_from_user(&topo, u64_to_user_ptr(query_item->data_ptr),
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sizeof(topo)))
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return -EFAULT;
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if (topo.flags != 0)
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return -EINVAL;
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if (!access_ok(VERIFY_WRITE, u64_to_user_ptr(query_item->data_ptr),
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total_length))
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return -EFAULT;
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memset(&topo, 0, sizeof(topo));
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topo.max_slices = sseu->max_slices;
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topo.max_subslices = sseu->max_subslices;
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topo.max_eus_per_subslice = sseu->max_eus_per_subslice;
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topo.subslice_offset = slice_length;
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topo.subslice_stride = DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE);
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topo.eu_offset = slice_length + subslice_length;
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topo.eu_stride =
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DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);
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if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr),
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&topo, sizeof(topo)))
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return -EFAULT;
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if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + sizeof(topo)),
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&sseu->slice_mask, slice_length))
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return -EFAULT;
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if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr +
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sizeof(topo) + slice_length),
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sseu->subslice_mask, subslice_length))
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return -EFAULT;
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if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr +
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sizeof(topo) +
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slice_length + subslice_length),
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sseu->eu_mask, eu_length))
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return -EFAULT;
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return total_length;
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}
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static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
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struct drm_i915_query_item *query_item) = {
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query_topology_info,
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};
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int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
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{
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struct drm_i915_private *dev_priv = to_i915(dev);
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struct drm_i915_query *args = data;
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struct drm_i915_query_item __user *user_item_ptr =
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u64_to_user_ptr(args->items_ptr);
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u32 i;
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if (args->flags != 0)
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return -EINVAL;
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for (i = 0; i < args->num_items; i++, user_item_ptr++) {
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struct drm_i915_query_item item;
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unsigned long func_idx;
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int ret;
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if (copy_from_user(&item, user_item_ptr, sizeof(item)))
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return -EFAULT;
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if (item.query_id == 0)
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return -EINVAL;
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if (overflows_type(item.query_id - 1, unsigned long))
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return -EINVAL;
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func_idx = item.query_id - 1;
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ret = -EINVAL;
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if (func_idx < ARRAY_SIZE(i915_query_funcs)) {
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func_idx = array_index_nospec(func_idx,
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ARRAY_SIZE(i915_query_funcs));
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ret = i915_query_funcs[func_idx](dev_priv, &item);
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}
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/* Only write the length back to userspace if they differ. */
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if (ret != item.length && put_user(ret, &user_item_ptr->length))
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return -EFAULT;
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}
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return 0;
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}
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