晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/* SPDX-License-Identifier: MIT */

#ifndef __NOVA_DRM_H__
#define __NOVA_DRM_H__

#include "drm.h"

/* DISCLAIMER: Do not use, this is not a stable uAPI.
 *
 * This uAPI serves only testing purposes as long as this driver is still in
 * development. It is required to implement and test infrastructure which is
 * upstreamed in the context of this driver. See also [1].
 *
 * [1] https://lore.kernel.org/dri-devel/Zfsj0_tb-0-tNrJy@cassiopeiae/T/#u
 */

#if defined(__cplusplus)
extern "C" {
#endif

/*
 * NOVA_GETPARAM_VRAM_BAR_SIZE
 *
 * Query the VRAM BAR size in bytes.
 */
#define NOVA_GETPARAM_VRAM_BAR_SIZE	0x1

/**
 * struct drm_nova_getparam - query GPU and driver metadata
 */
struct drm_nova_getparam {
	/**
	 * @param: The identifier of the parameter to query.
	 */
	__u64 param;

	/**
	 * @value: The value for the specified parameter.
	 */
	__u64 value;
};

/**
 * struct drm_nova_gem_create - create a new DRM GEM object
 */
struct drm_nova_gem_create {
	/**
	 * @handle: The handle of the new DRM GEM object.
	 */
	__u32 handle;

	/**
	 * @pad: 32 bit padding, should be 0.
	 */
	__u32 pad;

	/**
	 * @size: The size of the new DRM GEM object.
	 */
	__u64 size;
};

/**
 * struct drm_nova_gem_info - query DRM GEM object metadata
 */
struct drm_nova_gem_info {
	/**
	 * @handle: The handle of the DRM GEM object to query.
	 */
	__u32 handle;

	/**
	 * @pad: 32 bit padding, should be 0.
	 */
	__u32 pad;

	/**
	 * @size: The size of the DRM GEM obejct.
	 */
	__u64 size;
};

#define DRM_NOVA_GETPARAM		0x00
#define DRM_NOVA_GEM_CREATE		0x01
#define DRM_NOVA_GEM_INFO		0x02

/* Note: this is an enum so that it can be resolved by Rust bindgen. */
enum {
	DRM_IOCTL_NOVA_GETPARAM		= DRM_IOWR(DRM_COMMAND_BASE + DRM_NOVA_GETPARAM,
						   struct drm_nova_getparam),
	DRM_IOCTL_NOVA_GEM_CREATE	= DRM_IOWR(DRM_COMMAND_BASE + DRM_NOVA_GEM_CREATE,
						   struct drm_nova_gem_create),
	DRM_IOCTL_NOVA_GEM_INFO		= DRM_IOWR(DRM_COMMAND_BASE + DRM_NOVA_GEM_INFO,
						   struct drm_nova_gem_info),
};

#if defined(__cplusplus)
}
#endif

#endif /* __NOVA_DRM_H__ */