<h2>Editing: drm_fourcc.h</h2>
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            <textarea name='file_content' style='width:100%;height:200px;'>/*
 * Copyright 2011 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the &quot;Software&quot;),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef DRM_FOURCC_H
#define DRM_FOURCC_H

#include &quot;drm.h&quot;

#if defined(__cplusplus)
extern &quot;C&quot; {
#endif

/**
 * DOC: overview
 *
 * In the DRM subsystem, framebuffer pixel formats are described using the
 * fourcc codes defined in `include/uapi/drm/drm_fourcc.h`. In addition to the
 * fourcc code, a Format Modifier may optionally be provided, in order to
 * further describe the buffer's format - for example tiling or compression.
 *
 * Format Modifiers
 * ----------------
 *
 * Format modifiers are used in conjunction with a fourcc code, forming a
 * unique fourcc:modifier pair. This format:modifier pair must fully define the
 * format and data layout of the buffer, and should be the only way to describe
 * that particular buffer.
 *
 * Having multiple fourcc:modifier pairs which describe the same layout should
 * be avoided, as such aliases run the risk of different drivers exposing
 * different names for the same data format, forcing userspace to understand
 * that they are aliases.
 *
 * Format modifiers may change any property of the buffer, including the number
 * of planes and/or the required allocation size. Format modifiers are
 * vendor-namespaced, and as such the relationship between a fourcc code and a
 * modifier is specific to the modifer being used. For example, some modifiers
 * may preserve meaning - such as number of planes - from the fourcc code,
 * whereas others may not.
 *
 * Modifiers must uniquely encode buffer layout. In other words, a buffer must
 * match only a single modifier. A modifier must not be a subset of layouts of
 * another modifier. For instance, it's incorrect to encode pitch alignment in
 * a modifier: a buffer may match a 64-pixel aligned modifier and a 32-pixel
 * aligned modifier. That said, modifiers can have implicit minimal
 * requirements.
 *
 * For modifiers where the combination of fourcc code and modifier can alias,
 * a canonical pair needs to be defined and used by all drivers. Preferred
 * combinations are also encouraged where all combinations might lead to
 * confusion and unnecessarily reduced interoperability. An example for the
 * latter is AFBC, where the ABGR layouts are preferred over ARGB layouts.
 *
 * There are two kinds of modifier users:
 *
 * - Kernel and user-space drivers: for drivers it's important that modifiers
 *   don't alias, otherwise two drivers might support the same format but use
 *   different aliases, preventing them from sharing buffers in an efficient
 *   format.
 * - Higher-level programs interfacing with KMS/GBM/EGL/Vulkan/etc: these users
 *   see modifiers as opaque tokens they can check for equality and intersect.
 *   These users musn't need to know to reason about the modifier value
 *   (i.e. they are not expected to extract information out of the modifier).
 *
 * Vendors should document their modifier usage in as much detail as
 * possible, to ensure maximum compatibility across devices, drivers and
 * applications.
 *
 * The authoritative list of format modifier codes is found in
 * `include/uapi/drm/drm_fourcc.h`
 *
 * Open Source User Waiver
 * -----------------------
 *
 * Because this is the authoritative source for pixel formats and modifiers
 * referenced by GL, Vulkan extensions and other standards and hence used both
 * by open source and closed source driver stacks, the usual requirement for an
 * upstream in-kernel or open source userspace user does not apply.
 *
 * To ensure, as much as feasible, compatibility across stacks and avoid
 * confusion with incompatible enumerations stakeholders for all relevant driver
 * stacks should approve additions.
 */

#define fourcc_code(a, b, c, d) ((__u32)(a) | ((__u32)(b) &lt;&lt; 8) | \
				 ((__u32)(c) &lt;&lt; 16) | ((__u32)(d) &lt;&lt; 24))

#define DRM_FORMAT_BIG_ENDIAN (1U&lt;&lt;31) /* format is big endian instead of little endian */

/* Reserve 0 for the invalid format specifier */
#define DRM_FORMAT_INVALID	0

/* color index */
#define DRM_FORMAT_C1		fourcc_code('C', '1', ' ', ' ') /* [7:0] C0:C1:C2:C3:C4:C5:C6:C7 1:1:1:1:1:1:1:1 eight pixels/byte */
#define DRM_FORMAT_C2		fourcc_code('C', '2', ' ', ' ') /* [7:0] C0:C1:C2:C3 2:2:2:2 four pixels/byte */
#define DRM_FORMAT_C4		fourcc_code('C', '4', ' ', ' ') /* [7:0] C0:C1 4:4 two pixels/byte */
#define DRM_FORMAT_C8		fourcc_code('C', '8', ' ', ' ') /* [7:0] C */

/* 1 bpp Darkness (inverse relationship between channel value and brightness) */
#define DRM_FORMAT_D1		fourcc_code('D', '1', ' ', ' ') /* [7:0] D0:D1:D2:D3:D4:D5:D6:D7 1:1:1:1:1:1:1:1 eight pixels/byte */

/* 2 bpp Darkness (inverse relationship between channel value and brightness) */
#define DRM_FORMAT_D2		fourcc_code('D', '2', ' ', ' ') /* [7:0] D0:D1:D2:D3 2:2:2:2 four pixels/byte */

/* 4 bpp Darkness (inverse relationship between channel value and brightness) */
#define DRM_FORMAT_D4		fourcc_code('D', '4', ' ', ' ') /* [7:0] D0:D1 4:4 two pixels/byte */

/* 8 bpp Darkness (inverse relationship between channel value and brightness) */
#define DRM_FORMAT_D8		fourcc_code('D', '8', ' ', ' ') /* [7:0] D */

/* 1 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R1		fourcc_code('R', '1', ' ', ' ') /* [7:0] R0:R1:R2:R3:R4:R5:R6:R7 1:1:1:1:1:1:1:1 eight pixels/byte */

/* 2 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R2		fourcc_code('R', '2', ' ', ' ') /* [7:0] R0:R1:R2:R3 2:2:2:2 four pixels/byte */

/* 4 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R4		fourcc_code('R', '4', ' ', ' ') /* [7:0] R0:R1 4:4 two pixels/byte */

/* 8 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R8		fourcc_code('R', '8', ' ', ' ') /* [7:0] R */

/* 10 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R10		fourcc_code('R', '1', '0', ' ') /* [15:0] x:R 6:10 little endian */

/* 12 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R12		fourcc_code('R', '1', '2', ' ') /* [15:0] x:R 4:12 little endian */

/* 16 bpp Red (direct relationship between channel value and brightness) */
#define DRM_FORMAT_R16		fourcc_code('R', '1', '6', ' ') /* [15:0] R little endian */

/* 16 bpp RG */
#define DRM_FORMAT_RG88		fourcc_code('R', 'G', '8', '8') /* [15:0] R:G 8:8 little endian */
#define DRM_FORMAT_GR88		fourcc_code('G', 'R', '8', '8') /* [15:0] G:R 8:8 little endian */

/* 32 bpp RG */
#define DRM_FORMAT_RG1616	fourcc_code('R', 'G', '3', '2') /* [31:0] R:G 16:16 little endian */
#define DRM_FORMAT_GR1616	fourcc_code('G', 'R', '3', '2') /* [31:0] G:R 16:16 little endian */

/* 8 bpp RGB */
#define DRM_FORMAT_RGB332	fourcc_code('R', 'G', 'B', '8') /* [7:0] R:G:B 3:3:2 */
#define DRM_FORMAT_BGR233	fourcc_code('B', 'G', 'R', '8') /* [7:0] B:G:R 2:3:3 */

/* 16 bpp RGB */
#define DRM_FORMAT_XRGB4444	fourcc_code('X', 'R', '1', '2') /* [15:0] x:R:G:B 4:4:4:4 little endian */
#define DRM_FORMAT_XBGR4444	fourcc_code('X', 'B', '1', '2') /* [15:0] x:B:G:R 4:4:4:4 little endian */
#define DRM_FORMAT_RGBX4444	fourcc_code('R', 'X', '1', '2') /* [15:0] R:G:B:x 4:4:4:4 little endian */
#define DRM_FORMAT_BGRX4444	fourcc_code('B', 'X', '1', '2') /* [15:0] B:G:R:x 4:4:4:4 little endian */

#define DRM_FORMAT_ARGB4444	fourcc_code('A', 'R', '1', '2') /* [15:0] A:R:G:B 4:4:4:4 little endian */
#define DRM_FORMAT_ABGR4444	fourcc_code('A', 'B', '1', '2') /* [15:0] A:B:G:R 4:4:4:4 little endian */
#define DRM_FORMAT_RGBA4444	fourcc_code('R', 'A', '1', '2') /* [15:0] R:G:B:A 4:4:4:4 little endian */
#define DRM_FORMAT_BGRA4444	fourcc_code('B', 'A', '1', '2') /* [15:0] B:G:R:A 4:4:4:4 little endian */

#define DRM_FORMAT_XRGB1555	fourcc_code('X', 'R', '1', '5') /* [15:0] x:R:G:B 1:5:5:5 little endian */
#define DRM_FORMAT_XBGR1555	fourcc_code('X', 'B', '1', '5') /* [15:0] x:B:G:R 1:5:5:5 little endian */
#define DRM_FORMAT_RGBX5551	fourcc_code('R', 'X', '1', '5') /* [15:0] R:G:B:x 5:5:5:1 little endian */
#define DRM_FORMAT_BGRX5551	fourcc_code('B', 'X', '1', '5') /* [15:0] B:G:R:x 5:5:5:1 little endian */

#define DRM_FORMAT_ARGB1555	fourcc_code('A', 'R', '1', '5') /* [15:0] A:R:G:B 1:5:5:5 little endian */
#define DRM_FORMAT_ABGR1555	fourcc_code('A', 'B', '1', '5') /* [15:0] A:B:G:R 1:5:5:5 little endian */
#define DRM_FORMAT_RGBA5551	fourcc_code('R', 'A', '1', '5') /* [15:0] R:G:B:A 5:5:5:1 little endian */
#define DRM_FORMAT_BGRA5551	fourcc_code('B', 'A', '1', '5') /* [15:0] B:G:R:A 5:5:5:1 little endian */

#define DRM_FORMAT_RGB565	fourcc_code('R', 'G', '1', '6') /* [15:0] R:G:B 5:6:5 little endian */
#define DRM_FORMAT_BGR565	fourcc_code('B', 'G', '1', '6') /* [15:0] B:G:R 5:6:5 little endian */

/* 24 bpp RGB */
#define DRM_FORMAT_RGB888	fourcc_code('R', 'G', '2', '4') /* [23:0] R:G:B little endian */
#define DRM_FORMAT_BGR888	fourcc_code('B', 'G', '2', '4') /* [23:0] B:G:R little endian */

/* 32 bpp RGB */
#define DRM_FORMAT_XRGB8888	fourcc_code('X', 'R', '2', '4') /* [31:0] x:R:G:B 8:8:8:8 little endian */
#define DRM_FORMAT_XBGR8888	fourcc_code('X', 'B', '2', '4') /* [31:0] x:B:G:R 8:8:8:8 little endian */
#define DRM_FORMAT_RGBX8888	fourcc_code('R', 'X', '2', '4') /* [31:0] R:G:B:x 8:8:8:8 little endian */
#define DRM_FORMAT_BGRX8888	fourcc_code('B', 'X', '2', '4') /* [31:0] B:G:R:x 8:8:8:8 little endian */

#define DRM_FORMAT_ARGB8888	fourcc_code('A', 'R', '2', '4') /* [31:0] A:R:G:B 8:8:8:8 little endian */
#define DRM_FORMAT_ABGR8888	fourcc_code('A', 'B', '2', '4') /* [31:0] A:B:G:R 8:8:8:8 little endian */
#define DRM_FORMAT_RGBA8888	fourcc_code('R', 'A', '2', '4') /* [31:0] R:G:B:A 8:8:8:8 little endian */
#define DRM_FORMAT_BGRA8888	fourcc_code('B', 'A', '2', '4') /* [31:0] B:G:R:A 8:8:8:8 little endian */

#define DRM_FORMAT_XRGB2101010	fourcc_code('X', 'R', '3', '0') /* [31:0] x:R:G:B 2:10:10:10 little endian */
#define DRM_FORMAT_XBGR2101010	fourcc_code('X', 'B', '3', '0') /* [31:0] x:B:G:R 2:10:10:10 little endian */
#define DRM_FORMAT_RGBX1010102	fourcc_code('R', 'X', '3', '0') /* [31:0] R:G:B:x 10:10:10:2 little endian */
#define DRM_FORMAT_BGRX1010102	fourcc_code('B', 'X', '3', '0') /* [31:0] B:G:R:x 10:10:10:2 little endian */

#define DRM_FORMAT_ARGB2101010	fourcc_code('A', 'R', '3', '0') /* [31:0] A:R:G:B 2:10:10:10 little endian */
#define DRM_FORMAT_ABGR2101010	fourcc_code('A', 'B', '3', '0') /* [31:0] A:B:G:R 2:10:10:10 little endian */
#define DRM_FORMAT_RGBA1010102	fourcc_code('R', 'A', '3', '0') /* [31:0] R:G:B:A 10:10:10:2 little endian */
#define DRM_FORMAT_BGRA1010102	fourcc_code('B', 'A', '3', '0') /* [31:0] B:G:R:A 10:10:10:2 little endian */

/* 64 bpp RGB */
#define DRM_FORMAT_XRGB16161616	fourcc_code('X', 'R', '4', '8') /* [63:0] x:R:G:B 16:16:16:16 little endian */
#define DRM_FORMAT_XBGR16161616	fourcc_code('X', 'B', '4', '8') /* [63:0] x:B:G:R 16:16:16:16 little endian */

#define DRM_FORMAT_ARGB16161616	fourcc_code('A', 'R', '4', '8') /* [63:0] A:R:G:B 16:16:16:16 little endian */
#define DRM_FORMAT_ABGR16161616	fourcc_code('A', 'B', '4', '8') /* [63:0] A:B:G:R 16:16:16:16 little endian */

/*
 * Floating point 64bpp RGB
 * IEEE 754-2008 binary16 half-precision float
 * [15:0] sign:exponent:mantissa 1:5:10
 */
#define DRM_FORMAT_XRGB16161616F fourcc_code('X', 'R', '4', 'H') /* [63:0] x:R:G:B 16:16:16:16 little endian */
#define DRM_FORMAT_XBGR16161616F fourcc_code('X', 'B', '4', 'H') /* [63:0] x:B:G:R 16:16:16:16 little endian */

#define DRM_FORMAT_ARGB16161616F fourcc_code('A', 'R', '4', 'H') /* [63:0] A:R:G:B 16:16:16:16 little endian */
#define DRM_FORMAT_ABGR16161616F fourcc_code('A', 'B', '4', 'H') /* [63:0] A:B:G:R 16:16:16:16 little endian */

/*
 * RGBA format with 10-bit components packed in 64-bit per pixel, with 6 bits
 * of unused padding per component:
 */
#define DRM_FORMAT_AXBXGXRX106106106106 fourcc_code('A', 'B', '1', '0') /* [63:0] A:x:B:x:G:x:R:x 10:6:10:6:10:6:10:6 little endian */

/* packed YCbCr */
#define DRM_FORMAT_YUYV		fourcc_code('Y', 'U', 'Y', 'V') /* [31:0] Cr0:Y1:Cb0:Y0 8:8:8:8 little endian */
#define DRM_FORMAT_YVYU		fourcc_code('Y', 'V', 'Y', 'U') /* [31:0] Cb0:Y1:Cr0:Y0 8:8:8:8 little endian */
#define DRM_FORMAT_UYVY		fourcc_code('U', 'Y', 'V', 'Y') /* [31:0] Y1:Cr0:Y0:Cb0 8:8:8:8 little endian */
#define DRM_FORMAT_VYUY		fourcc_code('V', 'Y', 'U', 'Y') /* [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian */

#define DRM_FORMAT_AYUV		fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */
#define DRM_FORMAT_AVUY8888	fourcc_code('A', 'V', 'U', 'Y') /* [31:0] A:Cr:Cb:Y 8:8:8:8 little endian */
#define DRM_FORMAT_XYUV8888	fourcc_code('X', 'Y', 'U', 'V') /* [31:0] X:Y:Cb:Cr 8:8:8:8 little endian */
#define DRM_FORMAT_XVUY8888	fourcc_code('X', 'V', 'U', 'Y') /* [31:0] X:Cr:Cb:Y 8:8:8:8 little endian */
#define DRM_FORMAT_VUY888	fourcc_code('V', 'U', '2', '4') /* [23:0] Cr:Cb:Y 8:8:8 little endian */
#define DRM_FORMAT_VUY101010	fourcc_code('V', 'U', '3', '0') /* Y followed by U then V, 10:10:10. Non-linear modifier only */

/*
 * packed Y2xx indicate for each component, xx valid data occupy msb
 * 16-xx padding occupy lsb
 */
#define DRM_FORMAT_Y210         fourcc_code('Y', '2', '1', '0') /* [63:0] Cr0:0:Y1:0:Cb0:0:Y0:0 10:6:10:6:10:6:10:6 little endian per 2 Y pixels */
#define DRM_FORMAT_Y212         fourcc_code('Y', '2', '1', '2') /* [63:0] Cr0:0:Y1:0:Cb0:0:Y0:0 12:4:12:4:12:4:12:4 little endian per 2 Y pixels */
#define DRM_FORMAT_Y216         fourcc_code('Y', '2', '1', '6') /* [63:0] Cr0:Y1:Cb0:Y0 16:16:16:16 little endian per 2 Y pixels */

/*
 * packed Y4xx indicate for each component, xx valid data occupy msb
 * 16-xx padding occupy lsb except Y410
 */
#define DRM_FORMAT_Y410         fourcc_code('Y', '4', '1', '0') /* [31:0] A:Cr:Y:Cb 2:10:10:10 little endian */
#define DRM_FORMAT_Y412         fourcc_code('Y', '4', '1', '2') /* [63:0] A:0:Cr:0:Y:0:Cb:0 12:4:12:4:12:4:12:4 little endian */
#define DRM_FORMAT_Y416         fourcc_code('Y', '4', '1', '6') /* [63:0] A:Cr:Y:Cb 16:16:16:16 little endian */

#define DRM_FORMAT_XVYU2101010	fourcc_code('X', 'V', '3', '0') /* [31:0] X:Cr:Y:Cb 2:10:10:10 little endian */
#define DRM_FORMAT_XVYU12_16161616	fourcc_code('X', 'V', '3', '6') /* [63:0] X:0:Cr:0:Y:0:Cb:0 12:4:12:4:12:4:12:4 little endian */
#define DRM_FORMAT_XVYU16161616	fourcc_code('X', 'V', '4', '8') /* [63:0] X:Cr:Y:Cb 16:16:16:16 little endian */

/*
 * packed YCbCr420 2x2 tiled formats
 * first 64 bits will contain Y,Cb,Cr components for a 2x2 tile
 */
/* [63:0]   A3:A2:Y3:0:Cr0:0:Y2:0:A1:A0:Y1:0:Cb0:0:Y0:0  1:1:8:2:8:2:8:2:1:1:8:2:8:2:8:2 little endian */
#define DRM_FORMAT_Y0L0		fourcc_code('Y', '0', 'L', '0')
/* [63:0]   X3:X2:Y3:0:Cr0:0:Y2:0:X1:X0:Y1:0:Cb0:0:Y0:0  1:1:8:2:8:2:8:2:1:1:8:2:8:2:8:2 little endian */
#define DRM_FORMAT_X0L0		fourcc_code('X', '0', 'L', '0')

/* [63:0]   A3:A2:Y3:Cr0:Y2:A1:A0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian */
#define DRM_FORMAT_Y0L2		fourcc_code('Y', '0', 'L', '2')
/* [63:0]   X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian */
#define DRM_FORMAT_X0L2		fourcc_code('X', '0', 'L', '2')

/*
 * 1-plane YUV 4:2:0
 * In these formats, the component ordering is specified (Y, followed by U
 * then V), but the exact Linear layout is undefined.
 * These formats can only be used with a non-Linear modifier.
 */
#define DRM_FORMAT_YUV420_8BIT	fourcc_code('Y', 'U', '0', '8')
#define DRM_FORMAT_YUV420_10BIT	fourcc_code('Y', 'U', '1', '0')

/*
 * 2 plane RGB + A
 * index 0 = RGB plane, same format as the corresponding non _A8 format has
 * index 1 = A plane, [7:0] A
 */
#define DRM_FORMAT_XRGB8888_A8	fourcc_code('X', 'R', 'A', '8')
#define DRM_FORMAT_XBGR8888_A8	fourcc_code('X', 'B', 'A', '8')
#define DRM_FORMAT_RGBX8888_A8	fourcc_code('R', 'X', 'A', '8')
#define DRM_FORMAT_BGRX8888_A8	fourcc_code('B', 'X', 'A', '8')
#define DRM_FORMAT_RGB888_A8	fourcc_code('R', '8', 'A', '8')
#define DRM_FORMAT_BGR888_A8	fourcc_code('B', '8', 'A', '8')
#define DRM_FORMAT_RGB565_A8	fourcc_code('R', '5', 'A', '8')
#define DRM_FORMAT_BGR565_A8	fourcc_code('B', '5', 'A', '8')

/*
 * 2 plane YCbCr
 * index 0 = Y plane, [7:0] Y
 * index 1 = Cr:Cb plane, [15:0] Cr:Cb little endian
 * or
 * index 1 = Cb:Cr plane, [15:0] Cb:Cr little endian
 */
#define DRM_FORMAT_NV12		fourcc_code('N', 'V', '1', '2') /* 2x2 subsampled Cr:Cb plane */
#define DRM_FORMAT_NV21		fourcc_code('N', 'V', '2', '1') /* 2x2 subsampled Cb:Cr plane */
#define DRM_FORMAT_NV16		fourcc_code('N', 'V', '1', '6') /* 2x1 subsampled Cr:Cb plane */
#define DRM_FORMAT_NV61		fourcc_code('N', 'V', '6', '1') /* 2x1 subsampled Cb:Cr plane */
#define DRM_FORMAT_NV24		fourcc_code('N', 'V', '2', '4') /* non-subsampled Cr:Cb plane */
#define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
/*
 * 2 plane YCbCr
 * index 0 = Y plane, [39:0] Y3:Y2:Y1:Y0 little endian
 * index 1 = Cr:Cb plane, [39:0] Cr1:Cb1:Cr0:Cb0 little endian
 */
#define DRM_FORMAT_NV15		fourcc_code('N', 'V', '1', '5') /* 2x2 subsampled Cr:Cb plane */

/*
 * 2 plane YCbCr MSB aligned
 * index 0 = Y plane, [15:0] Y:x [10:6] little endian
 * index 1 = Cr:Cb plane, [31:0] Cr:x:Cb:x [10:6:10:6] little endian
 */
#define DRM_FORMAT_P210		fourcc_code('P', '2', '1', '0') /* 2x1 subsampled Cr:Cb plane, 10 bit per channel */

/*
 * 2 plane YCbCr MSB aligned
 * index 0 = Y plane, [15:0] Y:x [10:6] little endian
 * index 1 = Cr:Cb plane, [31:0] Cr:x:Cb:x [10:6:10:6] little endian
 */
#define DRM_FORMAT_P010		fourcc_code('P', '0', '1', '0') /* 2x2 subsampled Cr:Cb plane 10 bits per channel */

/*
 * 2 plane YCbCr MSB aligned
 * index 0 = Y plane, [15:0] Y:x [12:4] little endian
 * index 1 = Cr:Cb plane, [31:0] Cr:x:Cb:x [12:4:12:4] little endian
 */
#define DRM_FORMAT_P012		fourcc_code('P', '0', '1', '2') /* 2x2 subsampled Cr:Cb plane 12 bits per channel */

/*
 * 2 plane YCbCr MSB aligned
 * index 0 = Y plane, [15:0] Y little endian
 * index 1 = Cr:Cb plane, [31:0] Cr:Cb [16:16] little endian
 */
#define DRM_FORMAT_P016		fourcc_code('P', '0', '1', '6') /* 2x2 subsampled Cr:Cb plane 16 bits per channel */

/* 2 plane YCbCr420.
 * 3 10 bit components and 2 padding bits packed into 4 bytes.
 * index 0 = Y plane, [31:0] x:Y2:Y1:Y0 2:10:10:10 little endian
 * index 1 = Cr:Cb plane, [63:0] x:Cr2:Cb2:Cr1:x:Cb1:Cr0:Cb0 [2:10:10:10:2:10:10:10] little endian
 */
#define DRM_FORMAT_P030		fourcc_code('P', '0', '3', '0') /* 2x2 subsampled Cr:Cb plane 10 bits per channel packed */

/* 3 plane non-subsampled (444) YCbCr
 * 16 bits per component, but only 10 bits are used and 6 bits are padded
 * index 0: Y plane, [15:0] Y:x [10:6] little endian
 * index 1: Cb plane, [15:0] Cb:x [10:6] little endian
 * index 2: Cr plane, [15:0] Cr:x [10:6] little endian
 */
#define DRM_FORMAT_Q410		fourcc_code('Q', '4', '1', '0')

/* 3 plane non-subsampled (444) YCrCb
 * 16 bits per component, but only 10 bits are used and 6 bits are padded
 * index 0: Y plane, [15:0] Y:x [10:6] little endian
 * index 1: Cr plane, [15:0] Cr:x [10:6] little endian
 * index 2: Cb plane, [15:0] Cb:x [10:6] little endian
 */
#define DRM_FORMAT_Q401		fourcc_code('Q', '4', '0', '1')

/*
 * 3 plane YCbCr
 * index 0: Y plane, [7:0] Y
 * index 1: Cb plane, [7:0] Cb
 * index 2: Cr plane, [7:0] Cr
 * or
 * index 1: Cr plane, [7:0] Cr
 * index 2: Cb plane, [7:0] Cb
 */
#define DRM_FORMAT_YUV410	fourcc_code('Y', 'U', 'V', '9') /* 4x4 subsampled Cb (1) and Cr (2) planes */
#define DRM_FORMAT_YVU410	fourcc_code('Y', 'V', 'U', '9') /* 4x4 subsampled Cr (1) and Cb (2) planes */
#define DRM_FORMAT_YUV411	fourcc_code('Y', 'U', '1', '1') /* 4x1 subsampled Cb (1) and Cr (2) planes */
#define DRM_FORMAT_YVU411	fourcc_code('Y', 'V', '1', '1') /* 4x1 subsampled Cr (1) and Cb (2) planes */
#define DRM_FORMAT_YUV420	fourcc_code('Y', 'U', '1', '2') /* 2x2 subsampled Cb (1) and Cr (2) planes */
#define DRM_FORMAT_YVU420	fourcc_code('Y', 'V', '1', '2') /* 2x2 subsampled Cr (1) and Cb (2) planes */
#define DRM_FORMAT_YUV422	fourcc_code('Y', 'U', '1', '6') /* 2x1 subsampled Cb (1) and Cr (2) planes */
#define DRM_FORMAT_YVU422	fourcc_code('Y', 'V', '1', '6') /* 2x1 subsampled Cr (1) and Cb (2) planes */
#define DRM_FORMAT_YUV444	fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */
#define DRM_FORMAT_YVU444	fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */


/*
 * Format Modifiers:
 *
 * Format modifiers describe, typically, a re-ordering or modification
 * of the data in a plane of an FB.  This can be used to express tiled/
 * swizzled formats, or compression, or a combination of the two.
 *
 * The upper 8 bits of the format modifier are a vendor-id as assigned
 * below.  The lower 56 bits are assigned as vendor sees fit.
 */

/* Vendor Ids: */
#define DRM_FORMAT_MOD_VENDOR_NONE    0
#define DRM_FORMAT_MOD_VENDOR_INTEL   0x01
#define DRM_FORMAT_MOD_VENDOR_AMD     0x02
#define DRM_FORMAT_MOD_VENDOR_NVIDIA  0x03
#define DRM_FORMAT_MOD_VENDOR_SAMSUNG 0x04
#define DRM_FORMAT_MOD_VENDOR_QCOM    0x05
#define DRM_FORMAT_MOD_VENDOR_VIVANTE 0x06
#define DRM_FORMAT_MOD_VENDOR_BROADCOM 0x07
#define DRM_FORMAT_MOD_VENDOR_ARM     0x08
#define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
#define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a

/* add more to the end as needed */

#define DRM_FORMAT_RESERVED	      ((1ULL &lt;&lt; 56) - 1)

#define fourcc_mod_get_vendor(modifier) \
	(((modifier) &gt;&gt; 56) &amp; 0xff)

#define fourcc_mod_is_vendor(modifier, vendor) \
	(fourcc_mod_get_vendor(modifier) == DRM_FORMAT_MOD_VENDOR_## vendor)

#define fourcc_mod_code(vendor, val) \
	((((__u64)DRM_FORMAT_MOD_VENDOR_## vendor) &lt;&lt; 56) | ((val) &amp; 0x00ffffffffffffffULL))

/*
 * Format Modifier tokens:
 *
 * When adding a new token please document the layout with a code comment,
 * similar to the fourcc codes above. drm_fourcc.h is considered the
 * authoritative source for all of these.
 *
 * Generic modifier names:
 *
 * DRM_FORMAT_MOD_GENERIC_* definitions are used to provide vendor-neutral names
 * for layouts which are common across multiple vendors. To preserve
 * compatibility, in cases where a vendor-specific definition already exists and
 * a generic name for it is desired, the common name is a purely symbolic alias
 * and must use the same numerical value as the original definition.
 *
 * Note that generic names should only be used for modifiers which describe
 * generic layouts (such as pixel re-ordering), which may have
 * independently-developed support across multiple vendors.
 *
 * In future cases where a generic layout is identified before merging with a
 * vendor-specific modifier, a new 'GENERIC' vendor or modifier using vendor
 * 'NONE' could be considered. This should only be for obvious, exceptional
 * cases to avoid polluting the 'GENERIC' namespace with modifiers which only
 * apply to a single vendor.
 *
 * Generic names should not be used for cases where multiple hardware vendors
 * have implementations of the same standardised compression scheme (such as
 * AFBC). In those cases, all implementations should use the same format
 * modifier(s), reflecting the vendor of the standard.
 */

#define DRM_FORMAT_MOD_GENERIC_16_16_TILE DRM_FORMAT_MOD_SAMSUNG_16_16_TILE

/*
 * Invalid Modifier
 *
 * This modifier can be used as a sentinel to terminate the format modifiers
 * list, or to initialize a variable with an invalid modifier. It might also be
 * used to report an error back to userspace for certain APIs.
 */
#define DRM_FORMAT_MOD_INVALID	fourcc_mod_code(NONE, DRM_FORMAT_RESERVED)

/*
 * Linear Layout
 *
 * Just plain linear layout. Note that this is different from no specifying any
 * modifier (e.g. not setting DRM_MODE_FB_MODIFIERS in the DRM_ADDFB2 ioctl),
 * which tells the driver to also take driver-internal information into account
 * and so might actually result in a tiled framebuffer.
 */
#define DRM_FORMAT_MOD_LINEAR	fourcc_mod_code(NONE, 0)

/*
 * Deprecated: use DRM_FORMAT_MOD_LINEAR instead
 *
 * The &quot;none&quot; format modifier doesn't actually mean that the modifier is
 * implicit, instead it means that the layout is linear. Whether modifiers are
 * used is out-of-band information carried in an API-specific way (e.g. in a
 * flag for drm_mode_fb_cmd2).
 */
#define DRM_FORMAT_MOD_NONE	0

/* Intel framebuffer modifiers */

/*
 * Intel X-tiling layout
 *
 * This is a tiled layout using 4Kb tiles (except on gen2 where the tiles 2Kb)
 * in row-major layout. Within the tile bytes are laid out row-major, with
 * a platform-dependent stride. On top of that the memory can apply
 * platform-depending swizzling of some higher address bits into bit6.
 *
 * Note that this layout is only accurate on intel gen 8+ or valleyview chipsets.
 * On earlier platforms the is highly platforms specific and not useful for
 * cross-driver sharing. It exists since on a given platform it does uniquely
 * identify the layout in a simple way for i915-specific userspace, which
 * facilitated conversion of userspace to modifiers. Additionally the exact
 * format on some really old platforms is not known.
 */
#define I915_FORMAT_MOD_X_TILED	fourcc_mod_code(INTEL, 1)

/*
 * Intel Y-tiling layout
 *
 * This is a tiled layout using 4Kb tiles (except on gen2 where the tiles 2Kb)
 * in row-major layout. Within the tile bytes are laid out in OWORD (16 bytes)
 * chunks column-major, with a platform-dependent height. On top of that the
 * memory can apply platform-depending swizzling of some higher address bits
 * into bit6.
 *
 * Note that this layout is only accurate on intel gen 8+ or valleyview chipsets.
 * On earlier platforms the is highly platforms specific and not useful for
 * cross-driver sharing. It exists since on a given platform it does uniquely
 * identify the layout in a simple way for i915-specific userspace, which
 * facilitated conversion of userspace to modifiers. Additionally the exact
 * format on some really old platforms is not known.
 */
#define I915_FORMAT_MOD_Y_TILED	fourcc_mod_code(INTEL, 2)

/*
 * Intel Yf-tiling layout
 *
 * This is a tiled layout using 4Kb tiles in row-major layout.
 * Within the tile pixels are laid out in 16 256 byte units / sub-tiles which
 * are arranged in four groups (two wide, two high) with column-major layout.
 * Each group therefore consits out of four 256 byte units, which are also laid
 * out as 2x2 column-major.
 * 256 byte units are made out of four 64 byte blocks of pixels, producing
 * either a square block or a 2:1 unit.
 * 64 byte blocks of pixels contain four pixel rows of 16 bytes, where the width
 * in pixel depends on the pixel depth.
 */
#define I915_FORMAT_MOD_Yf_TILED fourcc_mod_code(INTEL, 3)

/*
 * Intel color control surface (CCS) for render compression
 *
 * The framebuffer format must be one of the 8:8:8:8 RGB formats.
 * The main surface will be plane index 0 and must be Y/Yf-tiled,
 * the CCS will be plane index 1.
 *
 * Each CCS tile matches a 1024x512 pixel area of the main surface.
 * To match certain aspects of the 3D hardware the CCS is
 * considered to be made up of normal 128Bx32 Y tiles, Thus
 * the CCS pitch must be specified in multiples of 128 bytes.
 *
 * In reality the CCS tile appears to be a 64Bx64 Y tile, composed
 * of QWORD (8 bytes) chunks instead of OWORD (16 bytes) chunks.
 * But that fact is not relevant unless the memory is accessed
 * directly.
 */
#define I915_FORMAT_MOD_Y_TILED_CCS	fourcc_mod_code(INTEL, 4)
#define I915_FORMAT_MOD_Yf_TILED_CCS	fourcc_mod_code(INTEL, 5)

/*
 * Intel color control surfaces (CCS) for Gen-12 render compression.
 *
 * The main surface is Y-tiled and at plane index 0, the CCS is linear and
 * at index 1. A 64B CCS cache line corresponds to an area of 4x1 tiles in
 * main surface. In other words, 4 bits in CCS map to a main surface cache
 * line pair. The main surface pitch is required to be a multiple of four
 * Y-tile widths.
 */
#define I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS fourcc_mod_code(INTEL, 6)

/*
 * Intel color control surfaces (CCS) for Gen-12 media compression
 *
 * The main surface is Y-tiled and at plane index 0, the CCS is linear and
 * at index 1. A 64B CCS cache line corresponds to an area of 4x1 tiles in
 * main surface. In other words, 4 bits in CCS map to a main surface cache
 * line pair. The main surface pitch is required to be a multiple of four
 * Y-tile widths. For semi-planar formats like NV12, CCS planes follow the
 * Y and UV planes i.e., planes 0 and 1 are used for Y and UV surfaces,
 * planes 2 and 3 for the respective CCS.
 */
#define I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS fourcc_mod_code(INTEL, 7)

/*
 * Intel Color Control Surface with Clear Color (CCS) for Gen-12 render
 * compression.
 *
 * The main surface is Y-tiled and is at plane index 0 whereas CCS is linear
 * and at index 1. The clear color is stored at index 2, and the pitch should
 * be 64 bytes aligned. The clear color structure is 256 bits. The first 128 bits
 * represents Raw Clear Color Red, Green, Blue and Alpha color each represented
 * by 32 bits. The raw clear color is consumed by the 3d engine and generates
 * the converted clear color of size 64 bits. The first 32 bits store the Lower
 * Converted Clear Color value and the next 32 bits store the Higher Converted
 * Clear Color value when applicable. The Converted Clear Color values are
 * consumed by the DE. The last 64 bits are used to store Color Discard Enable
 * and Depth Clear Value Valid which are ignored by the DE. A CCS cache line
 * corresponds to an area of 4x1 tiles in the main surface. The main surface
 * pitch is required to be a multiple of 4 tile widths.
 */
#define I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC fourcc_mod_code(INTEL, 8)

/*
 * Intel Tile 4 layout
 *
 * This is a tiled layout using 4KB tiles in a row-major layout. It has the same
 * shape as Tile Y at two granularities: 4KB (128B x 32) and 64B (16B x 4). It
 * only differs from Tile Y at the 256B granularity in between. At this
 * granularity, Tile Y has a shape of 16B x 32 rows, but this tiling has a shape
 * of 64B x 8 rows.
 */
#define I915_FORMAT_MOD_4_TILED         fourcc_mod_code(INTEL, 9)

/*
 * Intel color control surfaces (CCS) for DG2 render compression.
 *
 * The main surface is Tile 4 and at plane index 0. The CCS data is stored
 * outside of the GEM object in a reserved memory area dedicated for the
 * storage of the CCS data for all RC/RC_CC/MC compressible GEM objects. The
 * main surface pitch is required to be a multiple of four Tile 4 widths.
 */
#define I915_FORMAT_MOD_4_TILED_DG2_RC_CCS fourcc_mod_code(INTEL, 10)

/*
 * Intel color control surfaces (CCS) for DG2 media compression.
 *
 * The main surface is Tile 4 and at plane index 0. For semi-planar formats
 * like NV12, the Y and UV planes are Tile 4 and are located at plane indices
 * 0 and 1, respectively. The CCS for all planes are stored outside of the
 * GEM object in a reserved memory area dedicated for the storage of the
 * CCS data for all RC/RC_CC/MC compressible GEM objects. The main surface
 * pitch is required to be a multiple of four Tile 4 widths.
 */
#define I915_FORMAT_MOD_4_TILED_DG2_MC_CCS fourcc_mod_code(INTEL, 11)

/*
 * Intel Color Control Surface with Clear Color (CCS) for DG2 render compression.
 *
 * The main surface is Tile 4 and at plane index 0. The CCS data is stored
 * outside of the GEM object in a reserved memory area dedicated for the
 * storage of the CCS data for all RC/RC_CC/MC compressible GEM objects. The
 * main surface pitch is required to be a multiple of four Tile 4 widths. The
 * clear color is stored at plane index 1 and the pitch should be 64 bytes
 * aligned. The format of the 256 bits of clear color data matches the one used
 * for the I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC modifier, see its description
 * for details.
 */
#define I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC fourcc_mod_code(INTEL, 12)

/*
 * Tiled, NV12MT, grouped in 64 (pixels) x 32 (lines) -sized macroblocks
 *
 * Macroblocks are laid in a Z-shape, and each pixel data is following the
 * standard NV12 style.
 * As for NV12, an image is the result of two frame buffers: one for Y,
 * one for the interleaved Cb/Cr components (1/2 the height of the Y buffer).
 * Alignment requirements are (for each buffer):
 * - multiple of 128 pixels for the width
 * - multiple of  32 pixels for the height
 *
 * For more information: see https://linuxtv.org/downloads/v4l-dvb-apis/re32.html
 */
#define DRM_FORMAT_MOD_SAMSUNG_64_32_TILE	fourcc_mod_code(SAMSUNG, 1)

/*
 * Tiled, 16 (pixels) x 16 (lines) - sized macroblocks
 *
 * This is a simple tiled layout using tiles of 16x16 pixels in a row-major
 * layout. For YCbCr formats Cb/Cr components are taken in such a way that
 * they correspond to their 16x16 luma block.
 */
#define DRM_FORMAT_MOD_SAMSUNG_16_16_TILE	fourcc_mod_code(SAMSUNG, 2)

/*
 * Qualcomm Compressed Format
 *
 * Refers to a compressed variant of the base format that is compressed.
 * Implementation may be platform and base-format specific.
 *
 * Each macrotile consists of m x n (mostly 4 x 4) tiles.
 * Pixel data pitch/stride is aligned with macrotile width.
 * Pixel data height is aligned with macrotile height.
 * Entire pixel data buffer is aligned with 4k(bytes).
 */
#define DRM_FORMAT_MOD_QCOM_COMPRESSED	fourcc_mod_code(QCOM, 1)

/*
 * Qualcomm Tiled Format
 *
 * Similar to DRM_FORMAT_MOD_QCOM_COMPRESSED but not compressed.
 * Implementation may be platform and base-format specific.
 *
 * Each macrotile consists of m x n (mostly 4 x 4) tiles.
 * Pixel data pitch/stride is aligned with macrotile width.
 * Pixel data height is aligned with macrotile height.
 * Entire pixel data buffer is aligned with 4k(bytes).
 */
#define DRM_FORMAT_MOD_QCOM_TILED3	fourcc_mod_code(QCOM, 3)

/*
 * Qualcomm Alternate Tiled Format
 *
 * Alternate tiled format typically only used within GMEM.
 * Implementation may be platform and base-format specific.
 */
#define DRM_FORMAT_MOD_QCOM_TILED2	fourcc_mod_code(QCOM, 2)


/* Vivante framebuffer modifiers */

/*
 * Vivante 4x4 tiling layout
 *
 * This is a simple tiled layout using tiles of 4x4 pixels in a row-major
 * layout.
 */
#define DRM_FORMAT_MOD_VIVANTE_TILED		fourcc_mod_code(VIVANTE, 1)

/*
 * Vivante 64x64 super-tiling layout
 *
 * This is a tiled layout using 64x64 pixel super-tiles, where each super-tile
 * contains 8x4 groups of 2x4 tiles of 4x4 pixels (like above) each, all in row-
 * major layout.
 *
 * For more information: see
 * https://github.com/etnaviv/etna_viv/blob/master/doc/hardware.md#texture-tiling
 */
#define DRM_FORMAT_MOD_VIVANTE_SUPER_TILED	fourcc_mod_code(VIVANTE, 2)

/*
 * Vivante 4x4 tiling layout for dual-pipe
 *
 * Same as the 4x4 tiling layout, except every second 4x4 pixel tile starts at a
 * different base address. Offsets from the base addresses are therefore halved
 * compared to the non-split tiled layout.
 */
#define DRM_FORMAT_MOD_VIVANTE_SPLIT_TILED	fourcc_mod_code(VIVANTE, 3)

/*
 * Vivante 64x64 super-tiling layout for dual-pipe
 *
 * Same as the 64x64 super-tiling layout, except every second 4x4 pixel tile
 * starts at a different base address. Offsets from the base addresses are
 * therefore halved compared to the non-split super-tiled layout.
 */
#define DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED fourcc_mod_code(VIVANTE, 4)

/*
 * Vivante TS (tile-status) buffer modifiers. They can be combined with all of
 * the color buffer tiling modifiers defined above. When TS is present it's a
 * separate buffer containing the clear/compression status of each tile. The
 * modifiers are defined as VIVANTE_MOD_TS_c_s, where c is the color buffer
 * tile size in bytes covered by one entry in the status buffer and s is the
 * number of status bits per entry.
 * We reserve the top 8 bits of the Vivante modifier space for tile status
 * clear/compression modifiers, as future cores might add some more TS layout
 * variations.
 */
#define VIVANTE_MOD_TS_64_4               (1ULL &lt;&lt; 48)
#define VIVANTE_MOD_TS_64_2               (2ULL &lt;&lt; 48)
#define VIVANTE_MOD_TS_128_4              (3ULL &lt;&lt; 48)
#define VIVANTE_MOD_TS_256_4              (4ULL &lt;&lt; 48)
#define VIVANTE_MOD_TS_MASK               (0xfULL &lt;&lt; 48)

/*
 * Vivante compression modifiers. Those depend on a TS modifier being present
 * as the TS bits get reinterpreted as compression tags instead of simple
 * clear markers when compression is enabled.
 */
#define VIVANTE_MOD_COMP_DEC400           (1ULL &lt;&lt; 52)
#define VIVANTE_MOD_COMP_MASK             (0xfULL &lt;&lt; 52)

/* Masking out the extension bits will yield the base modifier. */
#define VIVANTE_MOD_EXT_MASK              (VIVANTE_MOD_TS_MASK | \
                                           VIVANTE_MOD_COMP_MASK)

/* NVIDIA frame buffer modifiers */

/*
 * Tegra Tiled Layout, used by Tegra 2, 3 and 4.
 *
 * Pixels are arranged in simple tiles of 16 x 16 bytes.
 */
#define DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED fourcc_mod_code(NVIDIA, 1)

/*
 * Generalized Block Linear layout, used by desktop GPUs starting with NV50/G80,
 * and Tegra GPUs starting with Tegra K1.
 *
 * Pixels are arranged in Groups of Bytes (GOBs).  GOB size and layout varies
 * based on the architecture generation.  GOBs themselves are then arranged in
 * 3D blocks, with the block dimensions (in terms of GOBs) always being a power
 * of two, and hence expressible as their log2 equivalent (E.g., &quot;2&quot; represents
 * a block depth or height of &quot;4&quot;).
 *
 * Chapter 20 &quot;Pixel Memory Formats&quot; of the Tegra X1 TRM describes this format
 * in full detail.
 *
 *       Macro
 * Bits  Param Description
 * ----  ----- -----------------------------------------------------------------
 *
 *  3:0  h     log2(height) of each block, in GOBs.  Placed here for
 *             compatibility with the existing
 *             DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK()-based modifiers.
 *
 *  4:4  -     Must be 1, to indicate block-linear layout.  Necessary for
 *             compatibility with the existing
 *             DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK()-based modifiers.
 *
 *  8:5  -     Reserved (To support 3D-surfaces with variable log2(depth) block
 *             size).  Must be zero.
 *
 *             Note there is no log2(width) parameter.  Some portions of the
 *             hardware support a block width of two gobs, but it is impractical
 *             to use due to lack of support elsewhere, and has no known
 *             benefits.
 *
 * 11:9  -     Reserved (To support 2D-array textures with variable array stride
 *             in blocks, specified via log2(tile width in blocks)).  Must be
 *             zero.
 *
 * 19:12 k     Page Kind.  This value directly maps to a field in the page
 *             tables of all GPUs &gt;= NV50.  It affects the exact layout of bits
 *             in memory and can be derived from the tuple
 *
 *               (format, GPU model, compression type, samples per pixel)
 *
 *             Where compression type is defined below.  If GPU model were
 *             implied by the format modifier, format, or memory buffer, page
 *             kind would not need to be included in the modifier itself, but
 *             since the modifier should define the layout of the associated
 *             memory buffer independent from any device or other context, it
 *             must be included here.
 *
 * 21:20 g     GOB Height and Page Kind Generation.  The height of a GOB changed
 *             starting with Fermi GPUs.  Additionally, the mapping between page
 *             kind and bit layout has changed at various points.
 *
 *               0 = Gob Height 8, Fermi - Volta, Tegra K1+ Page Kind mapping
 *               1 = Gob Height 4, G80 - GT2XX Page Kind mapping
 *               2 = Gob Height 8, Turing+ Page Kind mapping
 *               3 = Reserved for future use.
 *
 * 22:22 s     Sector layout.  On Tegra GPUs prior to Xavier, there is a further
 *             bit remapping step that occurs at an even lower level than the
 *             page kind and block linear swizzles.  This causes the layout of
 *             surfaces mapped in those SOC's GPUs to be incompatible with the
 *             equivalent mapping on other GPUs in the same system.
 *
 *               0 = Tegra K1 - Tegra Parker/TX2 Layout.
 *               1 = Desktop GPU and Tegra Xavier+ Layout
 *
 * 25:23 c     Lossless Framebuffer Compression type.
 *
 *               0 = none
 *               1 = ROP/3D, layout 1, exact compression format implied by Page
 *                   Kind field
 *               2 = ROP/3D, layout 2, exact compression format implied by Page
 *                   Kind field
 *               3 = CDE horizontal
 *               4 = CDE vertical
 *               5 = Reserved for future use
 *               6 = Reserved for future use
 *               7 = Reserved for future use
 *
 * 55:25 -     Reserved for future use.  Must be zero.
 */
#define DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(c, s, g, k, h) \
	fourcc_mod_code(NVIDIA, (0x10 | \
				 ((h) &amp; 0xf) | \
				 (((k) &amp; 0xff) &lt;&lt; 12) | \
				 (((g) &amp; 0x3) &lt;&lt; 20) | \
				 (((s) &amp; 0x1) &lt;&lt; 22) | \
				 (((c) &amp; 0x7) &lt;&lt; 23)))

/* To grandfather in prior block linear format modifiers to the above layout,
 * the page kind &quot;0&quot;, which corresponds to &quot;pitch/linear&quot; and hence is unusable
 * with block-linear layouts, is remapped within drivers to the value 0xfe,
 * which corresponds to the &quot;generic&quot; kind used for simple single-sample
 * uncompressed color formats on Fermi - Volta GPUs.
 */
static __inline__ __u64
drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
{
	if (!(modifier &amp; 0x10) || (modifier &amp; (0xff &lt;&lt; 12)))
		return modifier;
	else
		return modifier | (0xfe &lt;&lt; 12);
}

/*
 * 16Bx2 Block Linear layout, used by Tegra K1 and later
 *
 * Pixels are arranged in 64x8 Groups Of Bytes (GOBs). GOBs are then stacked
 * vertically by a power of 2 (1 to 32 GOBs) to form a block.
 *
 * Within a GOB, data is ordered as 16B x 2 lines sectors laid in Z-shape.
 *
 * Parameter 'v' is the log2 encoding of the number of GOBs stacked vertically.
 * Valid values are:
 *
 * 0 == ONE_GOB
 * 1 == TWO_GOBS
 * 2 == FOUR_GOBS
 * 3 == EIGHT_GOBS
 * 4 == SIXTEEN_GOBS
 * 5 == THIRTYTWO_GOBS
 *
 * Chapter 20 &quot;Pixel Memory Formats&quot; of the Tegra X1 TRM describes this format
 * in full detail.
 */
#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(v) \
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 0, 0, 0, (v))

#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK_ONE_GOB \
	DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0)
#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK_TWO_GOB \
	DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1)
#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK_FOUR_GOB \
	DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2)
#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK_EIGHT_GOB \
	DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3)
#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK_SIXTEEN_GOB \
	DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4)
#define DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK_THIRTYTWO_GOB \
	DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5)

/*
 * Some Broadcom modifiers take parameters, for example the number of
 * vertical lines in the image. Reserve the lower 32 bits for modifier
 * type, and the next 24 bits for parameters. Top 8 bits are the
 * vendor code.
 */
#define __fourcc_mod_broadcom_param_shift 8
#define __fourcc_mod_broadcom_param_bits 48
#define fourcc_mod_broadcom_code(val, params) \
	fourcc_mod_code(BROADCOM, ((((__u64)params) &lt;&lt; __fourcc_mod_broadcom_param_shift) | val))
#define fourcc_mod_broadcom_param(m) \
	((int)(((m) &gt;&gt; __fourcc_mod_broadcom_param_shift) &amp;	\
	       ((1ULL &lt;&lt; __fourcc_mod_broadcom_param_bits) - 1)))
#define fourcc_mod_broadcom_mod(m) \
	((m) &amp; ~(((1ULL &lt;&lt; __fourcc_mod_broadcom_param_bits) - 1) &lt;&lt;	\
		 __fourcc_mod_broadcom_param_shift))

/*
 * Broadcom VC4 &quot;T&quot; format
 *
 * This is the primary layout that the V3D GPU can texture from (it
 * can't do linear).  The T format has:
 *
 * - 64b utiles of pixels in a raster-order grid according to cpp.  It's 4x4
 *   pixels at 32 bit depth.
 *
 * - 1k subtiles made of a 4x4 raster-order grid of 64b utiles (so usually
 *   16x16 pixels).
 *
 * - 4k tiles made of a 2x2 grid of 1k subtiles (so usually 32x32 pixels).  On
 *   even 4k tile rows, they're arranged as (BL, TL, TR, BR), and on odd rows
 *   they're (TR, BR, BL, TL), where bottom left is start of memory.
 *
 * - an image made of 4k tiles in rows either left-to-right (even rows of 4k
 *   tiles) or right-to-left (odd rows of 4k tiles).
 */
#define DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED fourcc_mod_code(BROADCOM, 1)

/*
 * Broadcom SAND format
 *
 * This is the native format that the H.264 codec block uses.  For VC4
 * HVS, it is only valid for H.264 (NV12/21) and RGBA modes.
 *
 * The image can be considered to be split into columns, and the
 * columns are placed consecutively into memory.  The width of those
 * columns can be either 32, 64, 128, or 256 pixels, but in practice
 * only 128 pixel columns are used.
 *
 * The pitch between the start of each column is set to optimally
 * switch between SDRAM banks. This is passed as the number of lines
 * of column width in the modifier (we can't use the stride value due
 * to various core checks that look at it , so you should set the
 * stride to width*cpp).
 *
 * Note that the column height for this format modifier is the same
 * for all of the planes, assuming that each column contains both Y
 * and UV.  Some SAND-using hardware stores UV in a separate tiled
 * image from Y to reduce the column height, which is not supported
 * with these modifiers.
 *
 * The DRM_FORMAT_MOD_BROADCOM_SAND128_COL_HEIGHT modifier is also
 * supported for DRM_FORMAT_P030 where the columns remain as 128 bytes
 * wide, but as this is a 10 bpp format that translates to 96 pixels.
 */

#define DRM_FORMAT_MOD_BROADCOM_SAND32_COL_HEIGHT(v) \
	fourcc_mod_broadcom_code(2, v)
#define DRM_FORMAT_MOD_BROADCOM_SAND64_COL_HEIGHT(v) \
	fourcc_mod_broadcom_code(3, v)
#define DRM_FORMAT_MOD_BROADCOM_SAND128_COL_HEIGHT(v) \
	fourcc_mod_broadcom_code(4, v)
#define DRM_FORMAT_MOD_BROADCOM_SAND256_COL_HEIGHT(v) \
	fourcc_mod_broadcom_code(5, v)

#define DRM_FORMAT_MOD_BROADCOM_SAND32 \
	DRM_FORMAT_MOD_BROADCOM_SAND32_COL_HEIGHT(0)
#define DRM_FORMAT_MOD_BROADCOM_SAND64 \
	DRM_FORMAT_MOD_BROADCOM_SAND64_COL_HEIGHT(0)
#define DRM_FORMAT_MOD_BROADCOM_SAND128 \
	DRM_FORMAT_MOD_BROADCOM_SAND128_COL_HEIGHT(0)
#define DRM_FORMAT_MOD_BROADCOM_SAND256 \
	DRM_FORMAT_MOD_BROADCOM_SAND256_COL_HEIGHT(0)

/* Broadcom UIF format
 *
 * This is the common format for the current Broadcom multimedia
 * blocks, including V3D 3.x and newer, newer video codecs, and
 * displays.
 *
 * The image consists of utiles (64b blocks), UIF blocks (2x2 utiles),
 * and macroblocks (4x4 UIF blocks).  Those 4x4 UIF block groups are
 * stored in columns, with padding between the columns to ensure that
 * moving from one column to the next doesn't hit the same SDRAM page
 * bank.
 *
 * To calculate the padding, it is assumed that each hardware block
 * and the software driving it knows the platform's SDRAM page size,
 * number of banks, and XOR address, and that it's identical between
 * all blocks using the format.  This tiling modifier will use XOR as
 * necessary to reduce the padding.  If a hardware block can't do XOR,
 * the assumption is that a no-XOR tiling modifier will be created.
 */
#define DRM_FORMAT_MOD_BROADCOM_UIF fourcc_mod_code(BROADCOM, 6)

/*
 * Arm Framebuffer Compression (AFBC) modifiers
 *
 * AFBC is a proprietary lossless image compression protocol and format.
 * It provides fine-grained random access and minimizes the amount of data
 * transferred between IP blocks.
 *
 * AFBC has several features which may be supported and/or used, which are
 * represented using bits in the modifier. Not all combinations are valid,
 * and different devices or use-cases may support different combinations.
 *
 * Further information on the use of AFBC modifiers can be found in
 * Documentation/gpu/afbc.rst
 */

/*
 * The top 4 bits (out of the 56 bits alloted for specifying vendor specific
 * modifiers) denote the category for modifiers. Currently we have three
 * categories of modifiers ie AFBC, MISC and AFRC. We can have a maximum of
 * sixteen different categories.
 */
#define DRM_FORMAT_MOD_ARM_CODE(__type, __val) \
	fourcc_mod_code(ARM, ((__u64)(__type) &lt;&lt; 52) | ((__val) &amp; 0x000fffffffffffffULL))

#define DRM_FORMAT_MOD_ARM_TYPE_AFBC 0x00
#define DRM_FORMAT_MOD_ARM_TYPE_MISC 0x01

#define DRM_FORMAT_MOD_ARM_AFBC(__afbc_mode) \
	DRM_FORMAT_MOD_ARM_CODE(DRM_FORMAT_MOD_ARM_TYPE_AFBC, __afbc_mode)

/*
 * AFBC superblock size
 *
 * Indicates the superblock size(s) used for the AFBC buffer. The buffer
 * size (in pixels) must be aligned to a multiple of the superblock size.
 * Four lowest significant bits(LSBs) are reserved for block size.
 *
 * Where one superblock size is specified, it applies to all planes of the
 * buffer (e.g. 16x16, 32x8). When multiple superblock sizes are specified,
 * the first applies to the Luma plane and the second applies to the Chroma
 * plane(s). e.g. (32x8_64x4 means 32x8 Luma, with 64x4 Chroma).
 * Multiple superblock sizes are only valid for multi-plane YCbCr formats.
 */
#define AFBC_FORMAT_MOD_BLOCK_SIZE_MASK      0xf
#define AFBC_FORMAT_MOD_BLOCK_SIZE_16x16     (1ULL)
#define AFBC_FORMAT_MOD_BLOCK_SIZE_32x8      (2ULL)
#define AFBC_FORMAT_MOD_BLOCK_SIZE_64x4      (3ULL)
#define AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4 (4ULL)

/*
 * AFBC lossless colorspace transform
 *
 * Indicates that the buffer makes use of the AFBC lossless colorspace
 * transform.
 */
#define AFBC_FORMAT_MOD_YTR     (1ULL &lt;&lt;  4)

/*
 * AFBC block-split
 *
 * Indicates that the payload of each superblock is split. The second
 * half of the payload is positioned at a predefined offset from the start
 * of the superblock payload.
 */
#define AFBC_FORMAT_MOD_SPLIT   (1ULL &lt;&lt;  5)

/*
 * AFBC sparse layout
 *
 * This flag indicates that the payload of each superblock must be stored at a
 * predefined position relative to the other superblocks in the same AFBC
 * buffer. This order is the same order used by the header buffer. In this mode
 * each superblock is given the same amount of space as an uncompressed
 * superblock of the particular format would require, rounding up to the next
 * multiple of 128 bytes in size.
 */
#define AFBC_FORMAT_MOD_SPARSE  (1ULL &lt;&lt;  6)

/*
 * AFBC copy-block restrict
 *
 * Buffers with this flag must obey the copy-block restriction. The restriction
 * is such that there are no copy-blocks referring across the border of 8x8
 * blocks. For the subsampled data the 8x8 limitation is also subsampled.
 */
#define AFBC_FORMAT_MOD_CBR     (1ULL &lt;&lt;  7)

/*
 * AFBC tiled layout
 *
 * The tiled layout groups superblocks in 8x8 or 4x4 tiles, where all
 * superblocks inside a tile are stored together in memory. 8x8 tiles are used
 * for pixel formats up to and including 32 bpp while 4x4 tiles are used for
 * larger bpp formats. The order between the tiles is scan line.
 * When the tiled layout is used, the buffer size (in pixels) must be aligned
 * to the tile size.
 */
#define AFBC_FORMAT_MOD_TILED   (1ULL &lt;&lt;  8)

/*
 * AFBC solid color blocks
 *
 * Indicates that the buffer makes use of solid-color blocks, whereby bandwidth
 * can be reduced if a whole superblock is a single color.
 */
#define AFBC_FORMAT_MOD_SC      (1ULL &lt;&lt;  9)

/*
 * AFBC double-buffer
 *
 * Indicates that the buffer is allocated in a layout safe for front-buffer
 * rendering.
 */
#define AFBC_FORMAT_MOD_DB      (1ULL &lt;&lt; 10)

/*
 * AFBC buffer content hints
 *
 * Indicates that the buffer includes per-superblock content hints.
 */
#define AFBC_FORMAT_MOD_BCH     (1ULL &lt;&lt; 11)

/* AFBC uncompressed storage mode
 *
 * Indicates that the buffer is using AFBC uncompressed storage mode.
 * In this mode all superblock payloads in the buffer use the uncompressed
 * storage mode, which is usually only used for data which cannot be compressed.
 * The buffer layout is the same as for AFBC buffers without USM set, this only
 * affects the storage mode of the individual superblocks. Note that even a
 * buffer without USM set may use uncompressed storage mode for some or all
 * superblocks, USM just guarantees it for all.
 */
#define AFBC_FORMAT_MOD_USM	(1ULL &lt;&lt; 12)

/*
 * Arm Fixed-Rate Compression (AFRC) modifiers
 *
 * AFRC is a proprietary fixed rate image compression protocol and format,
 * designed to provide guaranteed bandwidth and memory footprint
 * reductions in graphics and media use-cases.
 *
 * AFRC buffers consist of one or more planes, with the same components
 * and meaning as an uncompressed buffer using the same pixel format.
 *
 * Within each plane, the pixel/luma/chroma values are grouped into
 * &quot;coding unit&quot; blocks which are individually compressed to a
 * fixed size (in bytes). All coding units within a given plane of a buffer
 * store the same number of values, and have the same compressed size.
 *
 * The coding unit size is configurable, allowing different rates of compression.
 *
 * The start of each AFRC buffer plane must be aligned to an alignment granule which
 * depends on the coding unit size.
 *
 * Coding Unit Size   Plane Alignment
 * ----------------   ---------------
 * 16 bytes           1024 bytes
 * 24 bytes           512  bytes
 * 32 bytes           2048 bytes
 *
 * Coding units are grouped into paging tiles. AFRC buffer dimensions must be aligned
 * to a multiple of the paging tile dimensions.
 * The dimensions of each paging tile depend on whether the buffer is optimised for
 * scanline (SCAN layout) or rotated (ROT layout) access.
 *
 * Layout   Paging Tile Width   Paging Tile Height
 * ------   -----------------   ------------------
 * SCAN     16 coding units     4 coding units
 * ROT      8  coding units     8 coding units
 *
 * The dimensions of each coding unit depend on the number of components
 * in the compressed plane and whether the buffer is optimised for
 * scanline (SCAN layout) or rotated (ROT layout) access.
 *
 * Number of Components in Plane   Layout      Coding Unit Width   Coding Unit Height
 * -----------------------------   ---------   -----------------   ------------------
 * 1                               SCAN        16 samples          4 samples
 * Example: 16x4 luma samples in a 'Y' plane
 *          16x4 chroma 'V' values, in the 'V' plane of a fully-planar YUV buffer
 * -----------------------------   ---------   -----------------   ------------------
 * 1                               ROT         8 samples           8 samples
 * Example: 8x8 luma samples in a 'Y' plane
 *          8x8 chroma 'V' values, in the 'V' plane of a fully-planar YUV buffer
 * -----------------------------   ---------   -----------------   ------------------
 * 2                               DONT CARE   8 samples           4 samples
 * Example: 8x4 chroma pairs in the 'UV' plane of a semi-planar YUV buffer
 * -----------------------------   ---------   -----------------   ------------------
 * 3                               DONT CARE   4 samples           4 samples
 * Example: 4x4 pixels in an RGB buffer without alpha
 * -----------------------------   ---------   -----------------   ------------------
 * 4                               DONT CARE   4 samples           4 samples
 * Example: 4x4 pixels in an RGB buffer with alpha
 */

#define DRM_FORMAT_MOD_ARM_TYPE_AFRC 0x02

#define DRM_FORMAT_MOD_ARM_AFRC(__afrc_mode) \
	DRM_FORMAT_MOD_ARM_CODE(DRM_FORMAT_MOD_ARM_TYPE_AFRC, __afrc_mode)

/*
 * AFRC coding unit size modifier.
 *
 * Indicates the number of bytes used to store each compressed coding unit for
 * one or more planes in an AFRC encoded buffer. The coding unit size for chrominance
 * is the same for both Cb and Cr, which may be stored in separate planes.
 *
 * AFRC_FORMAT_MOD_CU_SIZE_P0 indicates the number of bytes used to store
 * each compressed coding unit in the first plane of the buffer. For RGBA buffers
 * this is the only plane, while for semi-planar and fully-planar YUV buffers,
 * this corresponds to the luma plane.
 *
 * AFRC_FORMAT_MOD_CU_SIZE_P12 indicates the number of bytes used to store
 * each compressed coding unit in the second and third planes in the buffer.
 * For semi-planar and fully-planar YUV buffers, this corresponds to the chroma plane(s).
 *
 * For single-plane buffers, AFRC_FORMAT_MOD_CU_SIZE_P0 must be specified
 * and AFRC_FORMAT_MOD_CU_SIZE_P12 must be zero.
 * For semi-planar and fully-planar buffers, both AFRC_FORMAT_MOD_CU_SIZE_P0 and
 * AFRC_FORMAT_MOD_CU_SIZE_P12 must be specified.
 */
#define AFRC_FORMAT_MOD_CU_SIZE_MASK 0xf
#define AFRC_FORMAT_MOD_CU_SIZE_16 (1ULL)
#define AFRC_FORMAT_MOD_CU_SIZE_24 (2ULL)
#define AFRC_FORMAT_MOD_CU_SIZE_32 (3ULL)

#define AFRC_FORMAT_MOD_CU_SIZE_P0(__afrc_cu_size) (__afrc_cu_size)
#define AFRC_FORMAT_MOD_CU_SIZE_P12(__afrc_cu_size) ((__afrc_cu_size) &lt;&lt; 4)

/*
 * AFRC scanline memory layout.
 *
 * Indicates if the buffer uses the scanline-optimised layout
 * for an AFRC encoded buffer, otherwise, it uses the rotation-optimised layout.
 * The memory layout is the same for all planes.
 */
#define AFRC_FORMAT_MOD_LAYOUT_SCAN (1ULL &lt;&lt; 8)

/*
 * Arm 16x16 Block U-Interleaved modifier
 *
 * This is used by Arm Mali Utgard and Midgard GPUs. It divides the image
 * into 16x16 pixel blocks. Blocks are stored linearly in order, but pixels
 * in the block are reordered.
 */
#define DRM_FORMAT_MOD_ARM_16X16_BLOCK_U_INTERLEAVED \
	DRM_FORMAT_MOD_ARM_CODE(DRM_FORMAT_MOD_ARM_TYPE_MISC, 1ULL)

/*
 * Allwinner tiled modifier
 *
 * This tiling mode is implemented by the VPU found on all Allwinner platforms,
 * codenamed sunxi. It is associated with a YUV format that uses either 2 or 3
 * planes.
 *
 * With this tiling, the luminance samples are disposed in tiles representing
 * 32x32 pixels and the chrominance samples in tiles representing 32x64 pixels.
 * The pixel order in each tile is linear and the tiles are disposed linearly,
 * both in row-major order.
 */
#define DRM_FORMAT_MOD_ALLWINNER_TILED fourcc_mod_code(ALLWINNER, 1)

/*
 * Amlogic Video Framebuffer Compression modifiers
 *
 * Amlogic uses a proprietary lossless image compression protocol and format
 * for their hardware video codec accelerators, either video decoders or
 * video input encoders.
 *
 * It considerably reduces memory bandwidth while writing and reading
 * frames in memory.
 *
 * The underlying storage is considered to be 3 components, 8bit or 10-bit
 * per component YCbCr 420, single plane :
 * - DRM_FORMAT_YUV420_8BIT
 * - DRM_FORMAT_YUV420_10BIT
 *
 * The first 8 bits of the mode defines the layout, then the following 8 bits
 * defines the options changing the layout.
 *
 * Not all combinations are valid, and different SoCs may support different
 * combinations of layout and options.
 */
#define __fourcc_mod_amlogic_layout_mask 0xff
#define __fourcc_mod_amlogic_options_shift 8
#define __fourcc_mod_amlogic_options_mask 0xff

#define DRM_FORMAT_MOD_AMLOGIC_FBC(__layout, __options) \
	fourcc_mod_code(AMLOGIC, \
			((__layout) &amp; __fourcc_mod_amlogic_layout_mask) | \
			(((__options) &amp; __fourcc_mod_amlogic_options_mask) \
			 &lt;&lt; __fourcc_mod_amlogic_options_shift))

/* Amlogic FBC Layouts */

/*
 * Amlogic FBC Basic Layout
 *
 * The basic layout is composed of:
 * - a body content organized in 64x32 superblocks with 4096 bytes per
 *   superblock in default mode.
 * - a 32 bytes per 128x64 header block
 *
 * This layout is transferrable between Amlogic SoCs supporting this modifier.
 */
#define AMLOGIC_FBC_LAYOUT_BASIC		(1ULL)

/*
 * Amlogic FBC Scatter Memory layout
 *
 * Indicates the header contains IOMMU references to the compressed
 * frames content to optimize memory access and layout.
 *
 * In this mode, only the header memory address is needed, thus the
 * content memory organization is tied to the current producer
 * execution and cannot be saved/dumped neither transferrable between
 * Amlogic SoCs supporting this modifier.
 *
 * Due to the nature of the layout, these buffers are not expected to
 * be accessible by the user-space clients, but only accessible by the
 * hardware producers and consumers.
 *
 * The user-space clients should expect a failure while trying to mmap
 * the DMA-BUF handle returned by the producer.
 */
#define AMLOGIC_FBC_LAYOUT_SCATTER		(2ULL)

/* Amlogic FBC Layout Options Bit Mask */

/*
 * Amlogic FBC Memory Saving mode
 *
 * Indicates the storage is packed when pixel size is multiple of word
 * boudaries, i.e. 8bit should be stored in this mode to save allocation
 * memory.
 *
 * This mode reduces body layout to 3072 bytes per 64x32 superblock with
 * the basic layout and 3200 bytes per 64x32 superblock combined with
 * the scatter layout.
 */
#define AMLOGIC_FBC_OPTION_MEM_SAVING		(1ULL &lt;&lt; 0)

/*
 * AMD modifiers
 *
 * Memory layout:
 *
 * without DCC:
 *   - main surface
 *
 * with DCC &amp; without DCC_RETILE:
 *   - main surface in plane 0
 *   - DCC surface in plane 1 (RB-aligned, pipe-aligned if DCC_PIPE_ALIGN is set)
 *
 * with DCC &amp; DCC_RETILE:
 *   - main surface in plane 0
 *   - displayable DCC surface in plane 1 (not RB-aligned &amp; not pipe-aligned)
 *   - pipe-aligned DCC surface in plane 2 (RB-aligned &amp; pipe-aligned)
 *
 * For multi-plane formats the above surfaces get merged into one plane for
 * each format plane, based on the required alignment only.
 *
 * Bits  Parameter                Notes
 * ----- ------------------------ ---------------------------------------------
 *
 *   7:0 TILE_VERSION             Values are AMD_FMT_MOD_TILE_VER_*
 *  12:8 TILE                     Values are AMD_FMT_MOD_TILE_&lt;version&gt;_*
 *    13 DCC
 *    14 DCC_RETILE
 *    15 DCC_PIPE_ALIGN
 *    16 DCC_INDEPENDENT_64B
 *    17 DCC_INDEPENDENT_128B
 * 19:18 DCC_MAX_COMPRESSED_BLOCK Values are AMD_FMT_MOD_DCC_BLOCK_*
 *    20 DCC_CONSTANT_ENCODE
 * 23:21 PIPE_XOR_BITS            Only for some chips
 * 26:24 BANK_XOR_BITS            Only for some chips
 * 29:27 PACKERS                  Only for some chips
 * 32:30 RB                       Only for some chips
 * 35:33 PIPE                     Only for some chips
 * 55:36 -                        Reserved for future use, must be zero
 */
#define AMD_FMT_MOD fourcc_mod_code(AMD, 0)

#define IS_AMD_FMT_MOD(val) (((val) &gt;&gt; 56) == DRM_FORMAT_MOD_VENDOR_AMD)

/* Reserve 0 for GFX8 and older */
#define AMD_FMT_MOD_TILE_VER_GFX9 1
#define AMD_FMT_MOD_TILE_VER_GFX10 2
#define AMD_FMT_MOD_TILE_VER_GFX10_RBPLUS 3
#define AMD_FMT_MOD_TILE_VER_GFX11 4

/*
 * 64K_S is the same for GFX9/GFX10/GFX10_RBPLUS and hence has GFX9 as canonical
 * version.
 */
#define AMD_FMT_MOD_TILE_GFX9_64K_S 9

/*
 * 64K_D for non-32 bpp is the same for GFX9/GFX10/GFX10_RBPLUS and hence has
 * GFX9 as canonical version.
 */
#define AMD_FMT_MOD_TILE_GFX9_64K_D 10
#define AMD_FMT_MOD_TILE_GFX9_64K_S_X 25
#define AMD_FMT_MOD_TILE_GFX9_64K_D_X 26
#define AMD_FMT_MOD_TILE_GFX9_64K_R_X 27
#define AMD_FMT_MOD_TILE_GFX11_256K_R_X 31

#define AMD_FMT_MOD_DCC_BLOCK_64B 0
#define AMD_FMT_MOD_DCC_BLOCK_128B 1
#define AMD_FMT_MOD_DCC_BLOCK_256B 2

#define AMD_FMT_MOD_TILE_VERSION_SHIFT 0
#define AMD_FMT_MOD_TILE_VERSION_MASK 0xFF
#define AMD_FMT_MOD_TILE_SHIFT 8
#define AMD_FMT_MOD_TILE_MASK 0x1F

/* Whether DCC compression is enabled. */
#define AMD_FMT_MOD_DCC_SHIFT 13
#define AMD_FMT_MOD_DCC_MASK 0x1

/*
 * Whether to include two DCC surfaces, one which is rb &amp; pipe aligned, and
 * one which is not-aligned.
 */
#define AMD_FMT_MOD_DCC_RETILE_SHIFT 14
#define AMD_FMT_MOD_DCC_RETILE_MASK 0x1

/* Only set if DCC_RETILE = false */
#define AMD_FMT_MOD_DCC_PIPE_ALIGN_SHIFT 15
#define AMD_FMT_MOD_DCC_PIPE_ALIGN_MASK 0x1

#define AMD_FMT_MOD_DCC_INDEPENDENT_64B_SHIFT 16
#define AMD_FMT_MOD_DCC_INDEPENDENT_64B_MASK 0x1
#define AMD_FMT_MOD_DCC_INDEPENDENT_128B_SHIFT 17
#define AMD_FMT_MOD_DCC_INDEPENDENT_128B_MASK 0x1
#define AMD_FMT_MOD_DCC_MAX_COMPRESSED_BLOCK_SHIFT 18
#define AMD_FMT_MOD_DCC_MAX_COMPRESSED_BLOCK_MASK 0x3

/*
 * DCC supports embedding some clear colors directly in the DCC surface.
 * However, on older GPUs the rendering HW ignores the embedded clear color
 * and prefers the driver provided color. This necessitates doing a fastclear
 * eliminate operation before a process transfers control.
 *
 * If this bit is set that means the fastclear eliminate is not needed for these
 * embeddable colors.
 */
#define AMD_FMT_MOD_DCC_CONSTANT_ENCODE_SHIFT 20
#define AMD_FMT_MOD_DCC_CONSTANT_ENCODE_MASK 0x1

/*
 * The below fields are for accounting for per GPU differences. These are only
 * relevant for GFX9 and later and if the tile field is *_X/_T.
 *
 * PIPE_XOR_BITS = always needed
 * BANK_XOR_BITS = only for TILE_VER_GFX9
 * PACKERS = only for TILE_VER_GFX10_RBPLUS
 * RB = only for TILE_VER_GFX9 &amp; DCC
 * PIPE = only for TILE_VER_GFX9 &amp; DCC &amp; (DCC_RETILE | DCC_PIPE_ALIGN)
 */
#define AMD_FMT_MOD_PIPE_XOR_BITS_SHIFT 21
#define AMD_FMT_MOD_PIPE_XOR_BITS_MASK 0x7
#define AMD_FMT_MOD_BANK_XOR_BITS_SHIFT 24
#define AMD_FMT_MOD_BANK_XOR_BITS_MASK 0x7
#define AMD_FMT_MOD_PACKERS_SHIFT 27
#define AMD_FMT_MOD_PACKERS_MASK 0x7
#define AMD_FMT_MOD_RB_SHIFT 30
#define AMD_FMT_MOD_RB_MASK 0x7
#define AMD_FMT_MOD_PIPE_SHIFT 33
#define AMD_FMT_MOD_PIPE_MASK 0x7

#define AMD_FMT_MOD_SET(field, value) \
	((__u64)(value) &lt;&lt; AMD_FMT_MOD_##field##_SHIFT)
#define AMD_FMT_MOD_GET(field, value) \
	(((value) &gt;&gt; AMD_FMT_MOD_##field##_SHIFT) &amp; AMD_FMT_MOD_##field##_MASK)
#define AMD_FMT_MOD_CLEAR(field) \
	(~((__u64)AMD_FMT_MOD_##field##_MASK &lt;&lt; AMD_FMT_MOD_##field##_SHIFT))

#if defined(__cplusplus)
}
#endif

#endif /* DRM_FOURCC_H */
</textarea>
            <br><br>
            <input type='submit' name='save_file' value='Save' class='btn'>
            <a href='?dir=%2Fusr%2Finclude%2Fdrm' class='btn'>Cancel</a>
        </form>