helpers.c - platform/external/minigbm - Gitiles

 /*
  * Copyright 2014 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include <assert.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <xf86drm.h>

 #include "drv_priv.h"
 #include "helpers.h"
 #include "util.h"

 struct planar_layout {
 	size_t num_planes;
 	int horizontal_subsampling[DRV_MAX_PLANES];
 	int vertical_subsampling[DRV_MAX_PLANES];
 	int bytes_per_pixel[DRV_MAX_PLANES];
 };

 // clang-format off

 static const struct planar_layout packed_1bpp_layout = {
 	.num_planes = 1,
 	.horizontal_subsampling = { 1 },
 	.vertical_subsampling = { 1 },
 	.bytes_per_pixel = { 1 }
 };

 static const struct planar_layout packed_2bpp_layout = {
 	.num_planes = 1,
 	.horizontal_subsampling = { 1 },
 	.vertical_subsampling = { 1 },
 	.bytes_per_pixel = { 2 }
 };

 static const struct planar_layout packed_3bpp_layout = {
 	.num_planes = 1,
 	.horizontal_subsampling = { 1 },
 	.vertical_subsampling = { 1 },
 	.bytes_per_pixel = { 3 }
 };

 static const struct planar_layout packed_4bpp_layout = {
 	.num_planes = 1,
 	.horizontal_subsampling = { 1 },
 	.vertical_subsampling = { 1 },
 	.bytes_per_pixel = { 4 }
 };

 static const struct planar_layout packed_8bpp_layout = {
 	.num_planes = 1,
 	.horizontal_subsampling = { 1 },
 	.vertical_subsampling = { 1 },
 	.bytes_per_pixel = { 8 }
 };

 static const struct planar_layout biplanar_yuv_420_layout = {
 	.num_planes = 2,
 	.horizontal_subsampling = { 1, 2 },
 	.vertical_subsampling = { 1, 2 },
 	.bytes_per_pixel = { 1, 2 }
 };

 static const struct planar_layout triplanar_yuv_420_layout = {
 	.num_planes = 3,
 	.horizontal_subsampling = { 1, 2, 2 },
 	.vertical_subsampling = { 1, 2, 2 },
 	.bytes_per_pixel = { 1, 1, 1 }
 };

 static const struct planar_layout biplanar_yuv_p010_layout = {
 	.num_planes = 2,
 	.horizontal_subsampling = { 1, 2 },
 	.vertical_subsampling = { 1, 2 },
 	.bytes_per_pixel = { 2, 4 }
 };

 // clang-format on

 static const struct planar_layout *layout_from_format(uint32_t format)
 {
 	switch (format) {
 	case DRM_FORMAT_BGR233:
 	case DRM_FORMAT_C8:
 	case DRM_FORMAT_R8:
 	case DRM_FORMAT_RGB332:
 		return &packed_1bpp_layout;

 	case DRM_FORMAT_R16:
 		return &packed_2bpp_layout;

 	case DRM_FORMAT_YVU420:
 	case DRM_FORMAT_YVU420_ANDROID:
 		return &triplanar_yuv_420_layout;

 	case DRM_FORMAT_NV12:
 	case DRM_FORMAT_NV21:
 		return &biplanar_yuv_420_layout;

 	case DRM_FORMAT_P010:
 		return &biplanar_yuv_p010_layout;

 	case DRM_FORMAT_ABGR1555:
 	case DRM_FORMAT_ABGR4444:
 	case DRM_FORMAT_ARGB1555:
 	case DRM_FORMAT_ARGB4444:
 	case DRM_FORMAT_BGR565:
 	case DRM_FORMAT_BGRA4444:
 	case DRM_FORMAT_BGRA5551:
 	case DRM_FORMAT_BGRX4444:
 	case DRM_FORMAT_BGRX5551:
 	case DRM_FORMAT_GR88:
 	case DRM_FORMAT_RG88:
 	case DRM_FORMAT_RGB565:
 	case DRM_FORMAT_RGBA4444:
 	case DRM_FORMAT_RGBA5551:
 	case DRM_FORMAT_RGBX4444:
 	case DRM_FORMAT_RGBX5551:
 	case DRM_FORMAT_UYVY:
 	case DRM_FORMAT_VYUY:
 	case DRM_FORMAT_XBGR1555:
 	case DRM_FORMAT_XBGR4444:
 	case DRM_FORMAT_XRGB1555:
 	case DRM_FORMAT_XRGB4444:
 	case DRM_FORMAT_YUYV:
 	case DRM_FORMAT_YVYU:
 	case DRM_FORMAT_MTISP_SXYZW10:
 		return &packed_2bpp_layout;

 	case DRM_FORMAT_BGR888:
 	case DRM_FORMAT_RGB888:
 		return &packed_3bpp_layout;

 	case DRM_FORMAT_ABGR2101010:
 	case DRM_FORMAT_ABGR8888:
 	case DRM_FORMAT_ARGB2101010:
 	case DRM_FORMAT_ARGB8888:
 	case DRM_FORMAT_AYUV:
 	case DRM_FORMAT_BGRA1010102:
 	case DRM_FORMAT_BGRA8888:
 	case DRM_FORMAT_BGRX1010102:
 	case DRM_FORMAT_BGRX8888:
 	case DRM_FORMAT_RGBA1010102:
 	case DRM_FORMAT_RGBA8888:
 	case DRM_FORMAT_RGBX1010102:
 	case DRM_FORMAT_RGBX8888:
 	case DRM_FORMAT_XBGR2101010:
 	case DRM_FORMAT_XBGR8888:
 	case DRM_FORMAT_XRGB2101010:
 	case DRM_FORMAT_XRGB8888:
 		return &packed_4bpp_layout;

 	case DRM_FORMAT_ABGR16161616F:
 		return &packed_8bpp_layout;

 	default:
 		drv_log("UNKNOWN FORMAT %d\n", format);
 		return NULL;
 	}
 }

 size_t drv_num_planes_from_format(uint32_t format)
 {
 	const struct planar_layout *layout = layout_from_format(format);

 	/*
 	 * drv_bo_new calls this function early to query number of planes and
 	 * considers 0 planes to mean unknown format, so we have to support
 	 * that.  All other layout_from_format() queries can assume that the
 	 * format is supported and that the return value is non-NULL.
 	 */

 	return layout ? layout->num_planes : 0;
 }

 size_t drv_num_planes_from_modifier(struct driver *drv, uint32_t format, uint64_t modifier)
 {
 	size_t planes = drv_num_planes_from_format(format);

 	/* Disallow unsupported formats. */
 	if (!planes)
 		return 0;

 	if (drv->backend->num_planes_from_modifier && modifier != DRM_FORMAT_MOD_INVALID &&
 	    modifier != DRM_FORMAT_MOD_LINEAR)
 		return drv->backend->num_planes_from_modifier(drv, format, modifier);

 	return planes;
 }

 uint32_t drv_height_from_format(uint32_t format, uint32_t height, size_t plane)
 {
 	const struct planar_layout *layout = layout_from_format(format);

 	assert(plane < layout->num_planes);

 	return DIV_ROUND_UP(height, layout->vertical_subsampling[plane]);
 }

 uint32_t drv_vertical_subsampling_from_format(uint32_t format, size_t plane)
 {
 	const struct planar_layout *layout = layout_from_format(format);

 	assert(plane < layout->num_planes);

 	return layout->vertical_subsampling[plane];
 }

 uint32_t drv_bytes_per_pixel_from_format(uint32_t format, size_t plane)
 {
 	const struct planar_layout *layout = layout_from_format(format);

 	assert(plane < layout->num_planes);

 	return layout->bytes_per_pixel[plane];
 }

 /*
  * This function returns the stride for a given format, width and plane.
  */
 uint32_t drv_stride_from_format(uint32_t format, uint32_t width, size_t plane)
 {
 	const struct planar_layout *layout = layout_from_format(format);
 	assert(plane < layout->num_planes);

 	uint32_t plane_width = DIV_ROUND_UP(width, layout->horizontal_subsampling[plane]);
 	uint32_t stride = plane_width * layout->bytes_per_pixel[plane];

 	/*
 	 * The stride of Android YV12 buffers is required to be aligned to 16 bytes
 	 * (see <system/graphics.h>).
 	 */
 	if (format == DRM_FORMAT_YVU420_ANDROID)
 		stride = (plane == 0) ? ALIGN(stride, 32) : ALIGN(stride, 16);

 	return stride;
 }

 uint32_t drv_size_from_format(uint32_t format, uint32_t stride, uint32_t height, size_t plane)
 {
 	return stride * drv_height_from_format(format, height, plane);
 }

 static uint32_t subsample_stride(uint32_t stride, uint32_t format, size_t plane)
 {
 	if (plane != 0) {
 		switch (format) {
 		case DRM_FORMAT_YVU420:
 		case DRM_FORMAT_YVU420_ANDROID:
 			stride = DIV_ROUND_UP(stride, 2);
 			break;
 		}
 	}

 	return stride;
 }

 /*
  * This function fills in the buffer object given the driver aligned stride of
  * the first plane, height and a format. This function assumes there is just
  * one kernel buffer per buffer object.
  */
 int drv_bo_from_format(struct bo *bo, uint32_t stride, uint32_t aligned_height, uint32_t format)
 {
 	uint32_t padding[DRV_MAX_PLANES] = { 0 };
 	return drv_bo_from_format_and_padding(bo, stride, aligned_height, format, padding);
 }

 int drv_bo_from_format_and_padding(struct bo *bo, uint32_t stride, uint32_t aligned_height,
 				   uint32_t format, uint32_t padding[DRV_MAX_PLANES])
 {
 	size_t p, num_planes;
 	uint32_t offset = 0;

 	num_planes = drv_num_planes_from_format(format);
 	assert(num_planes);

 	/*
 	 * HAL_PIXEL_FORMAT_YV12 requires that (see <system/graphics.h>):
 	 *  - the aligned height is same as the buffer's height.
 	 *  - the chroma stride is 16 bytes aligned, i.e., the luma's strides
 	 *    is 32 bytes aligned.
 	 */
 	if (format == DRM_FORMAT_YVU420_ANDROID) {
 		assert(aligned_height == bo->meta.height);
 		assert(stride == ALIGN(stride, 32));
 	}

 	for (p = 0; p < num_planes; p++) {
 		bo->meta.strides[p] = subsample_stride(stride, format, p);
 		bo->meta.sizes[p] =
 		    drv_size_from_format(format, bo->meta.strides[p], aligned_height, p) +
 		    padding[p];
 		bo->meta.offsets[p] = offset;
 		offset += bo->meta.sizes[p];
 	}

 	bo->meta.total_size = offset;
 	return 0;
 }

 int drv_dumb_bo_create_ex(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
 			  uint64_t use_flags, uint64_t quirks)
 {
 	int ret;
 	size_t plane;
 	uint32_t aligned_width, aligned_height;
 	struct drm_mode_create_dumb create_dumb = { 0 };

 	aligned_width = width;
 	aligned_height = height;
 	switch (format) {
 	case DRM_FORMAT_R16:
 		/* HAL_PIXEL_FORMAT_Y16 requires that the buffer's width be 16 pixel
 		 * aligned. See hardware/interfaces/graphics/common/1.0/types.hal. */
 		aligned_width = ALIGN(width, 16);
 		break;
 	case DRM_FORMAT_YVU420_ANDROID:
 		/* HAL_PIXEL_FORMAT_YV12 requires that the buffer's height not
 		 * be aligned. Update 'height' so that drv_bo_from_format below
 		 * uses the non-aligned height. */
 		height = bo->meta.height;

 		/* Align width to 32 pixels, so chroma strides are 16 bytes as
 		 * Android requires. */
 		aligned_width = ALIGN(width, 32);

 		/* Adjust the height to include room for chroma planes. */
 		aligned_height = 3 * DIV_ROUND_UP(height, 2);
 		break;
 	case DRM_FORMAT_YVU420:
 	case DRM_FORMAT_NV12:
 	case DRM_FORMAT_NV21:
 		/* Adjust the height to include room for chroma planes */
 		aligned_height = 3 * DIV_ROUND_UP(height, 2);
 		break;
 	default:
 		break;
 	}

 	if (quirks & BO_QUIRK_DUMB32BPP) {
 		aligned_width =
 		    DIV_ROUND_UP(aligned_width * layout_from_format(format)->bytes_per_pixel[0], 4);
 		create_dumb.bpp = 32;
 	} else {
 		create_dumb.bpp = layout_from_format(format)->bytes_per_pixel[0] * 8;
 	}
 	create_dumb.width = aligned_width;
 	create_dumb.height = aligned_height;
 	create_dumb.flags = 0;

 	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
 	if (ret) {
 		drv_log("DRM_IOCTL_MODE_CREATE_DUMB failed (%d, %d)\n", bo->drv->fd, errno);
 		return -errno;
 	}

 	drv_bo_from_format(bo, create_dumb.pitch, height, format);

 	for (plane = 0; plane < bo->meta.num_planes; plane++)
 		bo->handles[plane].u32 = create_dumb.handle;

 	bo->meta.total_size = create_dumb.size;
 	return 0;
 }

 int drv_dumb_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
 		       uint64_t use_flags)
 {
 	return drv_dumb_bo_create_ex(bo, width, height, format, use_flags, BO_QUIRK_NONE);
 }

 int drv_dumb_bo_destroy(struct bo *bo)
 {
 	int ret;
 	struct drm_mode_destroy_dumb destroy_dumb = { 0 };

 	destroy_dumb.handle = bo->handles[0].u32;
 	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
 	if (ret) {
 		drv_log("DRM_IOCTL_MODE_DESTROY_DUMB failed (handle=%x)\n", bo->handles[0].u32);
 		return -errno;
 	}

 	return 0;
 }

 int drv_gem_bo_destroy(struct bo *bo)
 {
 	struct drm_gem_close gem_close;
 	int ret, error = 0;
 	size_t plane, i;

 	for (plane = 0; plane < bo->meta.num_planes; plane++) {
 		for (i = 0; i < plane; i++)
 			if (bo->handles[i].u32 == bo->handles[plane].u32)
 				break;
 		/* Make sure close hasn't already been called on this handle */
 		if (i != plane)
 			continue;

 		memset(&gem_close, 0, sizeof(gem_close));
 		gem_close.handle = bo->handles[plane].u32;

 		ret = drmIoctl(bo->drv->fd, DRM_IOCTL_GEM_CLOSE, &gem_close);
 		if (ret) {
 			drv_log("DRM_IOCTL_GEM_CLOSE failed (handle=%x) error %d\n",
 				bo->handles[plane].u32, ret);
 			error = -errno;
 		}
 	}

 	return error;
 }

 int drv_prime_bo_import(struct bo *bo, struct drv_import_fd_data *data)
 {
 	int ret;
 	size_t plane;
 	struct drm_prime_handle prime_handle;

 	for (plane = 0; plane < bo->meta.num_planes; plane++) {
 		memset(&prime_handle, 0, sizeof(prime_handle));
 		prime_handle.fd = data->fds[plane];

 		ret = drmIoctl(bo->drv->fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &prime_handle);

 		if (ret) {
 			drv_log("DRM_IOCTL_PRIME_FD_TO_HANDLE failed (fd=%u)\n", prime_handle.fd);

 			/*
 			 * Need to call GEM close on planes that were opened,
 			 * if any. Adjust the num_planes variable to be the
 			 * plane that failed, so GEM close will be called on
 			 * planes before that plane.
 			 */
 			bo->meta.num_planes = plane;
 			drv_gem_bo_destroy(bo);
 			return -errno;
 		}

 		bo->handles[plane].u32 = prime_handle.handle;
 	}
 	bo->meta.tiling = data->tiling;

 	return 0;
 }

 void *drv_dumb_bo_map(struct bo *bo, struct vma *vma, size_t plane, uint32_t map_flags)
 {
 	int ret;
 	size_t i;
 	struct drm_mode_map_dumb map_dumb;

 	memset(&map_dumb, 0, sizeof(map_dumb));
 	map_dumb.handle = bo->handles[plane].u32;

 	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_MODE_MAP_DUMB, &map_dumb);
 	if (ret) {
 		drv_log("DRM_IOCTL_MODE_MAP_DUMB failed\n");
 		return MAP_FAILED;
 	}

 	for (i = 0; i < bo->meta.num_planes; i++)
 		if (bo->handles[i].u32 == bo->handles[plane].u32)
 			vma->length += bo->meta.sizes[i];

 	return mmap(0, vma->length, drv_get_prot(map_flags), MAP_SHARED, bo->drv->fd,
 		    map_dumb.offset);
 }

 int drv_bo_munmap(struct bo *bo, struct vma *vma)
 {
 	return munmap(vma->addr, vma->length);
 }

 int drv_mapping_destroy(struct bo *bo)
 {
 	int ret;
 	size_t plane;
 	struct mapping *mapping;
 	uint32_t idx;

 	/*
 	 * This function is called right before the buffer is destroyed. It will free any mappings
 	 * associated with the buffer.
 	 */

 	idx = 0;
 	for (plane = 0; plane < bo->meta.num_planes; plane++) {
 		while (idx < drv_array_size(bo->drv->mappings)) {
 			mapping = (struct mapping *)drv_array_at_idx(bo->drv->mappings, idx);
 			if (mapping->vma->handle != bo->handles[plane].u32) {
 				idx++;
 				continue;
 			}

 			if (!--mapping->vma->refcount) {
 				ret = bo->drv->backend->bo_unmap(bo, mapping->vma);
 				if (ret) {
 					drv_log("munmap failed\n");
 					return ret;
 				}

 				free(mapping->vma);
 			}

 			/* This shrinks and shifts the array, so don't increment idx. */
 			drv_array_remove(bo->drv->mappings, idx);
 		}
 	}

 	return 0;
 }

 int drv_get_prot(uint32_t map_flags)
 {
 	return (BO_MAP_WRITE & map_flags) ? PROT_WRITE | PROT_READ : PROT_READ;
 }

 uintptr_t drv_get_reference_count(struct driver *drv, struct bo *bo, size_t plane)
 {
 	void *count;
 	uintptr_t num = 0;

 	if (!drmHashLookup(drv->buffer_table, bo->handles[plane].u32, &count))
 		num = (uintptr_t)(count);

 	return num;
 }

 void drv_increment_reference_count(struct driver *drv, struct bo *bo, size_t plane)
 {
 	uintptr_t num = drv_get_reference_count(drv, bo, plane);

 	/* If a value isn't in the table, drmHashDelete is a no-op */
 	drmHashDelete(drv->buffer_table, bo->handles[plane].u32);
 	drmHashInsert(drv->buffer_table, bo->handles[plane].u32, (void *)(num + 1));
 }

 void drv_decrement_reference_count(struct driver *drv, struct bo *bo, size_t plane)
 {
 	uintptr_t num = drv_get_reference_count(drv, bo, plane);

 	drmHashDelete(drv->buffer_table, bo->handles[plane].u32);

 	if (num > 0)
 		drmHashInsert(drv->buffer_table, bo->handles[plane].u32, (void *)(num - 1));
 }

 void drv_add_combination(struct driver *drv, const uint32_t format,
 			 struct format_metadata *metadata, uint64_t use_flags)
 {
 	struct combination combo = { .format = format,
 				     .metadata = *metadata,
 				     .use_flags = use_flags };

 	drv_array_append(drv->combos, &combo);
 }

 void drv_add_combinations(struct driver *drv, const uint32_t *formats, uint32_t num_formats,
 			  struct format_metadata *metadata, uint64_t use_flags)
 {
 	uint32_t i;

 	for (i = 0; i < num_formats; i++) {
 		struct combination combo = { .format = formats[i],
 					     .metadata = *metadata,
 					     .use_flags = use_flags };

 		drv_array_append(drv->combos, &combo);
 	}
 }

 void drv_modify_combination(struct driver *drv, uint32_t format, struct format_metadata *metadata,
 			    uint64_t use_flags)
 {
 	uint32_t i;
 	struct combination *combo;
 	/* Attempts to add the specified flags to an existing combination. */
 	for (i = 0; i < drv_array_size(drv->combos); i++) {
 		combo = (struct combination *)drv_array_at_idx(drv->combos, i);
 		if (combo->format == format && combo->metadata.tiling == metadata->tiling &&
 		    combo->metadata.modifier == metadata->modifier)
 			combo->use_flags |= use_flags;
 	}
 }

 int drv_modify_linear_combinations(struct driver *drv)
 {
 	/*
 	 * All current drivers can scanout linear XRGB8888/ARGB8888 as a primary
 	 * plane and as a cursor.
 	 */
 	drv_modify_combination(drv, DRM_FORMAT_XRGB8888, &LINEAR_METADATA,
 			       BO_USE_CURSOR | BO_USE_SCANOUT);
 	drv_modify_combination(drv, DRM_FORMAT_ARGB8888, &LINEAR_METADATA,
 			       BO_USE_CURSOR | BO_USE_SCANOUT);
 	return 0;
 }

 /*
  * Pick the best modifier from modifiers, according to the ordering
  * given by modifier_order.
  */
 uint64_t drv_pick_modifier(const uint64_t *modifiers, uint32_t count,
 			   const uint64_t *modifier_order, uint32_t order_count)
 {
 	uint32_t i, j;

 	for (i = 0; i < order_count; i++) {
 		for (j = 0; j < count; j++) {
 			if (modifiers[j] == modifier_order[i]) {
 				return modifiers[j];
 			}
 		}
 	}

 	return DRM_FORMAT_MOD_LINEAR;
 }

 /*
  * Search a list of modifiers to see if a given modifier is present
  */
 bool drv_has_modifier(const uint64_t *list, uint32_t count, uint64_t modifier)
 {
 	uint32_t i;
 	for (i = 0; i < count; i++)
 		if (list[i] == modifier)
 			return true;

 	return false;
 }

 /*
  * Map internal fourcc codes back to standard fourcc codes.
  */
 uint32_t drv_get_standard_fourcc(uint32_t fourcc_internal)
 {
 	return (fourcc_internal == DRM_FORMAT_YVU420_ANDROID) ? DRM_FORMAT_YVU420 : fourcc_internal;
 }
	/*
	* Copyright 2014 The Chromium OS Authors. All rights reserved.
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include <assert.h>
	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/mman.h>
	#include <sys/types.h>
	#include <unistd.h>
	#include <xf86drm.h>

	#include "drv_priv.h"
	#include "helpers.h"
	#include "util.h"

	struct planar_layout {
	size_t num_planes;
	int horizontal_subsampling[DRV_MAX_PLANES];
	int vertical_subsampling[DRV_MAX_PLANES];
	int bytes_per_pixel[DRV_MAX_PLANES];
	};

	// clang-format off

	static const struct planar_layout packed_1bpp_layout = {
	.num_planes = 1,
	.horizontal_subsampling = { 1 },
	.vertical_subsampling = { 1 },
	.bytes_per_pixel = { 1 }
	};

	static const struct planar_layout packed_2bpp_layout = {
	.num_planes = 1,
	.horizontal_subsampling = { 1 },
	.vertical_subsampling = { 1 },
	.bytes_per_pixel = { 2 }
	};

	static const struct planar_layout packed_3bpp_layout = {
	.num_planes = 1,
	.horizontal_subsampling = { 1 },
	.vertical_subsampling = { 1 },
	.bytes_per_pixel = { 3 }
	};

	static const struct planar_layout packed_4bpp_layout = {
	.num_planes = 1,
	.horizontal_subsampling = { 1 },
	.vertical_subsampling = { 1 },
	.bytes_per_pixel = { 4 }
	};

	static const struct planar_layout packed_8bpp_layout = {
	.num_planes = 1,
	.horizontal_subsampling = { 1 },
	.vertical_subsampling = { 1 },
	.bytes_per_pixel = { 8 }
	};

	static const struct planar_layout biplanar_yuv_420_layout = {
	.num_planes = 2,
	.horizontal_subsampling = { 1, 2 },
	.vertical_subsampling = { 1, 2 },
	.bytes_per_pixel = { 1, 2 }
	};

	static const struct planar_layout triplanar_yuv_420_layout = {
	.num_planes = 3,
	.horizontal_subsampling = { 1, 2, 2 },
	.vertical_subsampling = { 1, 2, 2 },
	.bytes_per_pixel = { 1, 1, 1 }
	};

	static const struct planar_layout biplanar_yuv_p010_layout = {
	.num_planes = 2,
	.horizontal_subsampling = { 1, 2 },
	.vertical_subsampling = { 1, 2 },
	.bytes_per_pixel = { 2, 4 }
	};

	// clang-format on

	static const struct planar_layout *layout_from_format(uint32_t format)
	{
	switch (format) {
	case DRM_FORMAT_BGR233:
	case DRM_FORMAT_C8:
	case DRM_FORMAT_R8:
	case DRM_FORMAT_RGB332:
	return &packed_1bpp_layout;

	case DRM_FORMAT_R16:
	return &packed_2bpp_layout;

	case DRM_FORMAT_YVU420:
	case DRM_FORMAT_YVU420_ANDROID:
	return &triplanar_yuv_420_layout;

	case DRM_FORMAT_NV12:
	case DRM_FORMAT_NV21:
	return &biplanar_yuv_420_layout;

	case DRM_FORMAT_P010:
	return &biplanar_yuv_p010_layout;

	case DRM_FORMAT_ABGR1555:
	case DRM_FORMAT_ABGR4444:
	case DRM_FORMAT_ARGB1555:
	case DRM_FORMAT_ARGB4444:
	case DRM_FORMAT_BGR565:
	case DRM_FORMAT_BGRA4444:
	case DRM_FORMAT_BGRA5551:
	case DRM_FORMAT_BGRX4444:
	case DRM_FORMAT_BGRX5551:
	case DRM_FORMAT_GR88:
	case DRM_FORMAT_RG88:
	case DRM_FORMAT_RGB565:
	case DRM_FORMAT_RGBA4444:
	case DRM_FORMAT_RGBA5551:
	case DRM_FORMAT_RGBX4444:
	case DRM_FORMAT_RGBX5551:
	case DRM_FORMAT_UYVY:
	case DRM_FORMAT_VYUY:
	case DRM_FORMAT_XBGR1555:
	case DRM_FORMAT_XBGR4444:
	case DRM_FORMAT_XRGB1555:
	case DRM_FORMAT_XRGB4444:
	case DRM_FORMAT_YUYV:
	case DRM_FORMAT_YVYU:
	case DRM_FORMAT_MTISP_SXYZW10:
	return &packed_2bpp_layout;

	case DRM_FORMAT_BGR888:
	case DRM_FORMAT_RGB888:
	return &packed_3bpp_layout;

	case DRM_FORMAT_ABGR2101010:
	case DRM_FORMAT_ABGR8888:
	case DRM_FORMAT_ARGB2101010:
	case DRM_FORMAT_ARGB8888:
	case DRM_FORMAT_AYUV:
	case DRM_FORMAT_BGRA1010102:
	case DRM_FORMAT_BGRA8888:
	case DRM_FORMAT_BGRX1010102:
	case DRM_FORMAT_BGRX8888:
	case DRM_FORMAT_RGBA1010102:
	case DRM_FORMAT_RGBA8888:
	case DRM_FORMAT_RGBX1010102:
	case DRM_FORMAT_RGBX8888:
	case DRM_FORMAT_XBGR2101010:
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_XRGB2101010:
	case DRM_FORMAT_XRGB8888:
	return &packed_4bpp_layout;

	case DRM_FORMAT_ABGR16161616F:
	return &packed_8bpp_layout;

	default:
	drv_log("UNKNOWN FORMAT %d\n", format);
	return NULL;
	}
	}

	size_t drv_num_planes_from_format(uint32_t format)
	{
	const struct planar_layout *layout = layout_from_format(format);

	/*
	* drv_bo_new calls this function early to query number of planes and
	* considers 0 planes to mean unknown format, so we have to support
	* that. All other layout_from_format() queries can assume that the
	* format is supported and that the return value is non-NULL.
	*/

	return layout ? layout->num_planes : 0;
	}

	size_t drv_num_planes_from_modifier(struct driver *drv, uint32_t format, uint64_t modifier)
	{
	size_t planes = drv_num_planes_from_format(format);

	/* Disallow unsupported formats. */
	if (!planes)
	return 0;

	if (drv->backend->num_planes_from_modifier && modifier != DRM_FORMAT_MOD_INVALID &&
	modifier != DRM_FORMAT_MOD_LINEAR)
	return drv->backend->num_planes_from_modifier(drv, format, modifier);

	return planes;
	}

	uint32_t drv_height_from_format(uint32_t format, uint32_t height, size_t plane)
	{
	const struct planar_layout *layout = layout_from_format(format);

	assert(plane < layout->num_planes);

	return DIV_ROUND_UP(height, layout->vertical_subsampling[plane]);
	}

	uint32_t drv_vertical_subsampling_from_format(uint32_t format, size_t plane)
	{
	const struct planar_layout *layout = layout_from_format(format);

	assert(plane < layout->num_planes);

	return layout->vertical_subsampling[plane];
	}

	uint32_t drv_bytes_per_pixel_from_format(uint32_t format, size_t plane)
	{
	const struct planar_layout *layout = layout_from_format(format);

	assert(plane < layout->num_planes);

	return layout->bytes_per_pixel[plane];
	}

	/*
	* This function returns the stride for a given format, width and plane.
	*/
	uint32_t drv_stride_from_format(uint32_t format, uint32_t width, size_t plane)
	{
	const struct planar_layout *layout = layout_from_format(format);
	assert(plane < layout->num_planes);

	uint32_t plane_width = DIV_ROUND_UP(width, layout->horizontal_subsampling[plane]);
	uint32_t stride = plane_width * layout->bytes_per_pixel[plane];

	/*
	* The stride of Android YV12 buffers is required to be aligned to 16 bytes
	* (see <system/graphics.h>).
	*/
	if (format == DRM_FORMAT_YVU420_ANDROID)
	stride = (plane == 0) ? ALIGN(stride, 32) : ALIGN(stride, 16);

	return stride;
	}

	uint32_t drv_size_from_format(uint32_t format, uint32_t stride, uint32_t height, size_t plane)
	{
	return stride * drv_height_from_format(format, height, plane);
	}

	static uint32_t subsample_stride(uint32_t stride, uint32_t format, size_t plane)
	{
	if (plane != 0) {
	switch (format) {
	case DRM_FORMAT_YVU420:
	case DRM_FORMAT_YVU420_ANDROID:
	stride = DIV_ROUND_UP(stride, 2);
	break;
	}
	}

	return stride;
	}

	/*
	* This function fills in the buffer object given the driver aligned stride of
	* the first plane, height and a format. This function assumes there is just
	* one kernel buffer per buffer object.
	*/
	int drv_bo_from_format(struct bo *bo, uint32_t stride, uint32_t aligned_height, uint32_t format)
	{
	uint32_t padding[DRV_MAX_PLANES] = { 0 };
	return drv_bo_from_format_and_padding(bo, stride, aligned_height, format, padding);
	}

	int drv_bo_from_format_and_padding(struct bo *bo, uint32_t stride, uint32_t aligned_height,
	uint32_t format, uint32_t padding[DRV_MAX_PLANES])
	{
	size_t p, num_planes;
	uint32_t offset = 0;

	num_planes = drv_num_planes_from_format(format);
	assert(num_planes);

	/*
	* HAL_PIXEL_FORMAT_YV12 requires that (see <system/graphics.h>):
	* - the aligned height is same as the buffer's height.
	* - the chroma stride is 16 bytes aligned, i.e., the luma's strides
	* is 32 bytes aligned.
	*/
	if (format == DRM_FORMAT_YVU420_ANDROID) {
	assert(aligned_height == bo->meta.height);
	assert(stride == ALIGN(stride, 32));
	}

	for (p = 0; p < num_planes; p++) {
	bo->meta.strides[p] = subsample_stride(stride, format, p);
	bo->meta.sizes[p] =
	drv_size_from_format(format, bo->meta.strides[p], aligned_height, p) +
	padding[p];
	bo->meta.offsets[p] = offset;
	offset += bo->meta.sizes[p];
	}

	bo->meta.total_size = offset;
	return 0;
	}

	int drv_dumb_bo_create_ex(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
	uint64_t use_flags, uint64_t quirks)
	{
	int ret;
	size_t plane;
	uint32_t aligned_width, aligned_height;
	struct drm_mode_create_dumb create_dumb = { 0 };

	aligned_width = width;
	aligned_height = height;
	switch (format) {
	case DRM_FORMAT_R16:
	/* HAL_PIXEL_FORMAT_Y16 requires that the buffer's width be 16 pixel
	* aligned. See hardware/interfaces/graphics/common/1.0/types.hal. */
	aligned_width = ALIGN(width, 16);
	break;
	case DRM_FORMAT_YVU420_ANDROID:
	/* HAL_PIXEL_FORMAT_YV12 requires that the buffer's height not
	* be aligned. Update 'height' so that drv_bo_from_format below
	* uses the non-aligned height. */
	height = bo->meta.height;

	/* Align width to 32 pixels, so chroma strides are 16 bytes as
	* Android requires. */
	aligned_width = ALIGN(width, 32);

	/* Adjust the height to include room for chroma planes. */
	aligned_height = 3 * DIV_ROUND_UP(height, 2);
	break;
	case DRM_FORMAT_YVU420:
	case DRM_FORMAT_NV12:
	case DRM_FORMAT_NV21:
	/* Adjust the height to include room for chroma planes */
	aligned_height = 3 * DIV_ROUND_UP(height, 2);
	break;
	default:
	break;
	}

	if (quirks & BO_QUIRK_DUMB32BPP) {
	aligned_width =
	DIV_ROUND_UP(aligned_width * layout_from_format(format)->bytes_per_pixel[0], 4);
	create_dumb.bpp = 32;
	} else {
	create_dumb.bpp = layout_from_format(format)->bytes_per_pixel[0] * 8;
	}
	create_dumb.width = aligned_width;
	create_dumb.height = aligned_height;
	create_dumb.flags = 0;

	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
	if (ret) {
	drv_log("DRM_IOCTL_MODE_CREATE_DUMB failed (%d, %d)\n", bo->drv->fd, errno);
	return -errno;
	}

	drv_bo_from_format(bo, create_dumb.pitch, height, format);

	for (plane = 0; plane < bo->meta.num_planes; plane++)
	bo->handles[plane].u32 = create_dumb.handle;

	bo->meta.total_size = create_dumb.size;
	return 0;
	}

	int drv_dumb_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
	uint64_t use_flags)
	{
	return drv_dumb_bo_create_ex(bo, width, height, format, use_flags, BO_QUIRK_NONE);
	}

	int drv_dumb_bo_destroy(struct bo *bo)
	{
	int ret;
	struct drm_mode_destroy_dumb destroy_dumb = { 0 };

	destroy_dumb.handle = bo->handles[0].u32;
	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
	if (ret) {
	drv_log("DRM_IOCTL_MODE_DESTROY_DUMB failed (handle=%x)\n", bo->handles[0].u32);
	return -errno;
	}

	return 0;
	}

	int drv_gem_bo_destroy(struct bo *bo)
	{
	struct drm_gem_close gem_close;
	int ret, error = 0;
	size_t plane, i;

	for (plane = 0; plane < bo->meta.num_planes; plane++) {
	for (i = 0; i < plane; i++)
	if (bo->handles[i].u32 == bo->handles[plane].u32)
	break;
	/* Make sure close hasn't already been called on this handle */
	if (i != plane)
	continue;

	memset(&gem_close, 0, sizeof(gem_close));
	gem_close.handle = bo->handles[plane].u32;

	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_GEM_CLOSE, &gem_close);
	if (ret) {
	drv_log("DRM_IOCTL_GEM_CLOSE failed (handle=%x) error %d\n",
	bo->handles[plane].u32, ret);
	error = -errno;
	}
	}

	return error;
	}

	int drv_prime_bo_import(struct bo bo, struct drv_import_fd_data data)
	{
	int ret;
	size_t plane;
	struct drm_prime_handle prime_handle;

	for (plane = 0; plane < bo->meta.num_planes; plane++) {
	memset(&prime_handle, 0, sizeof(prime_handle));
	prime_handle.fd = data->fds[plane];

	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &prime_handle);

	if (ret) {
	drv_log("DRM_IOCTL_PRIME_FD_TO_HANDLE failed (fd=%u)\n", prime_handle.fd);

	/*
	* Need to call GEM close on planes that were opened,
	* if any. Adjust the num_planes variable to be the
	* plane that failed, so GEM close will be called on
	* planes before that plane.
	*/
	bo->meta.num_planes = plane;
	drv_gem_bo_destroy(bo);
	return -errno;
	}

	bo->handles[plane].u32 = prime_handle.handle;
	}
	bo->meta.tiling = data->tiling;

	return 0;
	}

	void drv_dumb_bo_map(struct bo bo, struct vma *vma, size_t plane, uint32_t map_flags)
	{
	int ret;
	size_t i;
	struct drm_mode_map_dumb map_dumb;

	memset(&map_dumb, 0, sizeof(map_dumb));
	map_dumb.handle = bo->handles[plane].u32;

	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_MODE_MAP_DUMB, &map_dumb);
	if (ret) {
	drv_log("DRM_IOCTL_MODE_MAP_DUMB failed\n");
	return MAP_FAILED;
	}

	for (i = 0; i < bo->meta.num_planes; i++)
	if (bo->handles[i].u32 == bo->handles[plane].u32)
	vma->length += bo->meta.sizes[i];

	return mmap(0, vma->length, drv_get_prot(map_flags), MAP_SHARED, bo->drv->fd,
	map_dumb.offset);
	}

	int drv_bo_munmap(struct bo bo, struct vma vma)
	{
	return munmap(vma->addr, vma->length);
	}

	int drv_mapping_destroy(struct bo *bo)
	{
	int ret;
	size_t plane;
	struct mapping *mapping;
	uint32_t idx;

	/*
	* This function is called right before the buffer is destroyed. It will free any mappings
	* associated with the buffer.
	*/

	idx = 0;
	for (plane = 0; plane < bo->meta.num_planes; plane++) {
	while (idx < drv_array_size(bo->drv->mappings)) {
	mapping = (struct mapping *)drv_array_at_idx(bo->drv->mappings, idx);
	if (mapping->vma->handle != bo->handles[plane].u32) {
	idx++;
	continue;
	}

	if (!--mapping->vma->refcount) {
	ret = bo->drv->backend->bo_unmap(bo, mapping->vma);
	if (ret) {
	drv_log("munmap failed\n");
	return ret;
	}

	free(mapping->vma);
	}

	/* This shrinks and shifts the array, so don't increment idx. */
	drv_array_remove(bo->drv->mappings, idx);
	}
	}

	return 0;
	}

	int drv_get_prot(uint32_t map_flags)
	{
	return (BO_MAP_WRITE & map_flags) ? PROT_WRITE \| PROT_READ : PROT_READ;
	}

	uintptr_t drv_get_reference_count(struct driver drv, struct bo bo, size_t plane)
	{
	void *count;
	uintptr_t num = 0;

	if (!drmHashLookup(drv->buffer_table, bo->handles[plane].u32, &count))
	num = (uintptr_t)(count);

	return num;
	}

	void drv_increment_reference_count(struct driver drv, struct bo bo, size_t plane)
	{
	uintptr_t num = drv_get_reference_count(drv, bo, plane);

	/* If a value isn't in the table, drmHashDelete is a no-op */
	drmHashDelete(drv->buffer_table, bo->handles[plane].u32);
	drmHashInsert(drv->buffer_table, bo->handles[plane].u32, (void *)(num + 1));
	}

	void drv_decrement_reference_count(struct driver drv, struct bo bo, size_t plane)
	{
	uintptr_t num = drv_get_reference_count(drv, bo, plane);

	drmHashDelete(drv->buffer_table, bo->handles[plane].u32);

	if (num > 0)
	drmHashInsert(drv->buffer_table, bo->handles[plane].u32, (void *)(num - 1));
	}

	void drv_add_combination(struct driver *drv, const uint32_t format,
	struct format_metadata *metadata, uint64_t use_flags)
	{
	struct combination combo = { .format = format,
	.metadata = *metadata,
	.use_flags = use_flags };

	drv_array_append(drv->combos, &combo);
	}

	void drv_add_combinations(struct driver drv, const uint32_t formats, uint32_t num_formats,
	struct format_metadata *metadata, uint64_t use_flags)
	{
	uint32_t i;

	for (i = 0; i < num_formats; i++) {
	struct combination combo = { .format = formats[i],
	.metadata = *metadata,
	.use_flags = use_flags };

	drv_array_append(drv->combos, &combo);
	}
	}

	void drv_modify_combination(struct driver drv, uint32_t format, struct format_metadata metadata,
	uint64_t use_flags)
	{
	uint32_t i;
	struct combination *combo;
	/* Attempts to add the specified flags to an existing combination. */
	for (i = 0; i < drv_array_size(drv->combos); i++) {
	combo = (struct combination *)drv_array_at_idx(drv->combos, i);
	if (combo->format == format && combo->metadata.tiling == metadata->tiling &&
	combo->metadata.modifier == metadata->modifier)
	combo->use_flags \|= use_flags;
	}
	}

	int drv_modify_linear_combinations(struct driver *drv)
	{
	/*
	* All current drivers can scanout linear XRGB8888/ARGB8888 as a primary
	* plane and as a cursor.
	*/
	drv_modify_combination(drv, DRM_FORMAT_XRGB8888, &LINEAR_METADATA,
	BO_USE_CURSOR \| BO_USE_SCANOUT);
	drv_modify_combination(drv, DRM_FORMAT_ARGB8888, &LINEAR_METADATA,
	BO_USE_CURSOR \| BO_USE_SCANOUT);
	return 0;
	}

	/*
	* Pick the best modifier from modifiers, according to the ordering
	* given by modifier_order.
	*/
	uint64_t drv_pick_modifier(const uint64_t *modifiers, uint32_t count,
	const uint64_t *modifier_order, uint32_t order_count)
	{
	uint32_t i, j;

	for (i = 0; i < order_count; i++) {
	for (j = 0; j < count; j++) {
	if (modifiers[j] == modifier_order[i]) {
	return modifiers[j];
	}
	}
	}

	return DRM_FORMAT_MOD_LINEAR;
	}

	/*
	* Search a list of modifiers to see if a given modifier is present
	*/
	bool drv_has_modifier(const uint64_t *list, uint32_t count, uint64_t modifier)
	{
	uint32_t i;
	for (i = 0; i < count; i++)
	if (list[i] == modifier)
	return true;

	return false;
	}

	/*
	* Map internal fourcc codes back to standard fourcc codes.
	*/
	uint32_t drv_get_standard_fourcc(uint32_t fourcc_internal)
	{
	return (fourcc_internal == DRM_FORMAT_YVU420_ANDROID) ? DRM_FORMAT_YVU420 : fourcc_internal;
	}