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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2023 Intel Corporation
*/
#include <linux/types.h>
#include <linux/build_bug.h>
/* XX: Figure out how to handle this vma mapping in xe */
struct intel_remapped_plane_info {
/* in gtt pages */
u32 offset:31;
u32 linear:1;
union {
/* in gtt pages for !linear */
struct {
u16 width;
u16 height;
u16 src_stride;
u16 dst_stride;
};
/* in gtt pages for linear */
u32 size;
};
} __packed;
struct intel_remapped_info {
struct intel_remapped_plane_info plane[4];
/* in gtt pages */
u32 plane_alignment;
} __packed;
struct intel_rotation_info {
struct intel_remapped_plane_info plane[2];
} __packed;
enum i915_gtt_view_type {
I915_GTT_VIEW_NORMAL = 0,
I915_GTT_VIEW_ROTATED = sizeof(struct intel_rotation_info),
I915_GTT_VIEW_REMAPPED = sizeof(struct intel_remapped_info),
};
static inline void assert_i915_gem_gtt_types(void)
{
BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 2 * sizeof(u32) + 8 * sizeof(u16));
BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 5 * sizeof(u32) + 16 * sizeof(u16));
/* Check that rotation/remapped shares offsets for simplicity */
BUILD_BUG_ON(offsetof(struct intel_remapped_info, plane[0]) !=
offsetof(struct intel_rotation_info, plane[0]));
BUILD_BUG_ON(offsetofend(struct intel_remapped_info, plane[1]) !=
offsetofend(struct intel_rotation_info, plane[1]));
/* As we encode the size of each branch inside the union into its type,
* we have to be careful that each branch has a unique size.
*/
switch ((enum i915_gtt_view_type)0) {
case I915_GTT_VIEW_NORMAL:
case I915_GTT_VIEW_ROTATED:
case I915_GTT_VIEW_REMAPPED:
/* gcc complains if these are identical cases */
break;
}
}
struct i915_gtt_view {
enum i915_gtt_view_type type;
union {
/* Members need to contain no holes/padding */
struct intel_rotation_info rotated;
struct intel_remapped_info remapped;
};
};
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