MODALIAS=acpi:PNP0A06:
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#ifndef _UAPI_VDUSE_H_
#define _UAPI_VDUSE_H_

#include <linux/types.h>

#define VDUSE_BASE	0x81

/* The ioctls for control device (/dev/vduse/control) */

#define VDUSE_API_VERSION	0

/*
 * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
 * This is used for future extension.
 */
#define VDUSE_GET_API_VERSION	_IOR(VDUSE_BASE, 0x00, __u64)

/* Set the version of VDUSE API that userspace supported. */
#define VDUSE_SET_API_VERSION	_IOW(VDUSE_BASE, 0x01, __u64)

/**
 * struct vduse_dev_config - basic configuration of a VDUSE device
 * @name: VDUSE device name, needs to be NUL terminated
 * @vendor_id: virtio vendor id
 * @device_id: virtio device id
 * @features: virtio features
 * @vq_num: the number of virtqueues
 * @vq_align: the allocation alignment of virtqueue's metadata
 * @reserved: for future use, needs to be initialized to zero
 * @config_size: the size of the configuration space
 * @config: the buffer of the configuration space
 *
 * Structure used by VDUSE_CREATE_DEV ioctl to create VDUSE device.
 */
struct vduse_dev_config {
#define VDUSE_NAME_MAX	256
	char name[VDUSE_NAME_MAX];
	__u32 vendor_id;
	__u32 device_id;
	__u64 features;
	__u32 vq_num;
	__u32 vq_align;
	__u32 reserved[13];
	__u32 config_size;
	__u8 config[];
};

/* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */
#define VDUSE_CREATE_DEV	_IOW(VDUSE_BASE, 0x02, struct vduse_dev_config)

/*
 * Destroy a VDUSE device. Make sure there are no more references
 * to the char device (/dev/vduse/$NAME).
 */
#define VDUSE_DESTROY_DEV	_IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX])

/* The ioctls for VDUSE device (/dev/vduse/$NAME) */

/**
 * struct vduse_iotlb_entry - entry of IOTLB to describe one IOVA region [start, last]
 * @offset: the mmap offset on returned file descriptor
 * @start: start of the IOVA region
 * @last: last of the IOVA region
 * @perm: access permission of the IOVA region
 *
 * Structure used by VDUSE_IOTLB_GET_FD ioctl to find an overlapped IOVA region.
 */
struct vduse_iotlb_entry {
	__u64 offset;
	__u64 start;
	__u64 last;
#define VDUSE_ACCESS_RO 0x1
#define VDUSE_ACCESS_WO 0x2
#define VDUSE_ACCESS_RW 0x3
	__u8 perm;
};

/*
 * Find the first IOVA region that overlaps with the range [start, last]
 * and return the corresponding file descriptor. Return -EINVAL means the
 * IOVA region doesn't exist. Caller should set start and last fields.
 */
#define VDUSE_IOTLB_GET_FD	_IOWR(VDUSE_BASE, 0x10, struct vduse_iotlb_entry)

/*
 * Get the negotiated virtio features. It's a subset of the features in
 * struct vduse_dev_config which can be accepted by virtio driver. It's
 * only valid after FEATURES_OK status bit is set.
 */
#define VDUSE_DEV_GET_FEATURES	_IOR(VDUSE_BASE, 0x11, __u64)

/**
 * struct vduse_config_data - data used to update configuration space
 * @offset: the offset from the beginning of configuration space
 * @length: the length to write to configuration space
 * @buffer: the buffer used to write from
 *
 * Structure used by VDUSE_DEV_SET_CONFIG ioctl to update device
 * configuration space.
 */
struct vduse_config_data {
	__u32 offset;
	__u32 length;
	__u8 buffer[];
};

/* Set device configuration space */
#define VDUSE_DEV_SET_CONFIG	_IOW(VDUSE_BASE, 0x12, struct vduse_config_data)

/*
 * Inject a config interrupt. It's usually used to notify virtio driver
 * that device configuration space has changed.
 */
#define VDUSE_DEV_INJECT_CONFIG_IRQ	_IO(VDUSE_BASE, 0x13)

/**
 * struct vduse_vq_config - basic configuration of a virtqueue
 * @index: virtqueue index
 * @max_size: the max size of virtqueue
 * @reserved: for future use, needs to be initialized to zero
 *
 * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue.
 */
struct vduse_vq_config {
	__u32 index;
	__u16 max_size;
	__u16 reserved[13];
};

/*
 * Setup the specified virtqueue. Make sure all virtqueues have been
 * configured before the device is attached