linux-headers/linux/vduse.h - qemu - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 #ifndef _VDUSE_H_
 #define _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 to vDPA bus.
  */
 #define VDUSE_VQ_SETUP		_IOW(VDUSE_BASE, 0x14, struct vduse_vq_config)

 /**
  * struct vduse_vq_state_split - split virtqueue state
  * @avail_index: available index
  */
 struct vduse_vq_state_split {
 	__u16 avail_index;
 };

 /**
  * struct vduse_vq_state_packed - packed virtqueue state
  * @last_avail_counter: last driver ring wrap counter observed by device
  * @last_avail_idx: device available index
  * @last_used_counter: device ring wrap counter
  * @last_used_idx: used index
  */
 struct vduse_vq_state_packed {
 	__u16 last_avail_counter;
 	__u16 last_avail_idx;
 	__u16 last_used_counter;
 	__u16 last_used_idx;
 };

 /**
  * struct vduse_vq_info - information of a virtqueue
  * @index: virtqueue index
  * @num: the size of virtqueue
  * @desc_addr: address of desc area
  * @driver_addr: address of driver area
  * @device_addr: address of device area
  * @split: split virtqueue state
  * @packed: packed virtqueue state
  * @ready: ready status of virtqueue
  *
  * Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information.
  */
 struct vduse_vq_info {
 	__u32 index;
 	__u32 num;
 	__u64 desc_addr;
 	__u64 driver_addr;
 	__u64 device_addr;
 	union {
 		struct vduse_vq_state_split split;
 		struct vduse_vq_state_packed packed;
 	};
 	__u8 ready;
 };

 /* Get the specified virtqueue's information. Caller should set index field. */
 #define VDUSE_VQ_GET_INFO	_IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info)

 /**
  * struct vduse_vq_eventfd - eventfd configuration for a virtqueue
  * @index: virtqueue index
  * @fd: eventfd, -1 means de-assigning the eventfd
  *
  * Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd.
  */
 struct vduse_vq_eventfd {
 	__u32 index;
 #define VDUSE_EVENTFD_DEASSIGN -1
 	int fd;
 };

 /*
  * Setup kick eventfd for specified virtqueue. The kick eventfd is used
  * by VDUSE kernel module to notify userspace to consume the avail vring.
  */
 #define VDUSE_VQ_SETUP_KICKFD	_IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd)

 /*
  * Inject an interrupt for specific virtqueue. It's used to notify virtio driver
  * to consume the used vring.
  */
 #define VDUSE_VQ_INJECT_IRQ	_IOW(VDUSE_BASE, 0x17, __u32)

 /* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */

 /**
  * enum vduse_req_type - request type
  * @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace
  * @VDUSE_SET_STATUS: set the device status
  * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for
  *                      specified IOVA range via VDUSE_IOTLB_GET_FD ioctl
  */
 enum vduse_req_type {
 	VDUSE_GET_VQ_STATE,
 	VDUSE_SET_STATUS,
 	VDUSE_UPDATE_IOTLB,
 };

 /**
  * struct vduse_vq_state - virtqueue state
  * @index: virtqueue index
  * @split: split virtqueue state
  * @packed: packed virtqueue state
  */
 struct vduse_vq_state {
 	__u32 index;
 	union {
 		struct vduse_vq_state_split split;
 		struct vduse_vq_state_packed packed;
 	};
 };

 /**
  * struct vduse_dev_status - device status
  * @status: device status
  */
 struct vduse_dev_status {
 	__u8 status;
 };

 /**
  * struct vduse_iova_range - IOVA range [start, last]
  * @start: start of the IOVA range
  * @last: last of the IOVA range
  */
 struct vduse_iova_range {
 	__u64 start;
 	__u64 last;
 };

 /**
  * struct vduse_dev_request - control request
  * @type: request type
  * @request_id: request id
  * @reserved: for future use
  * @vq_state: virtqueue state, only index field is available
  * @s: device status
  * @iova: IOVA range for updating
  * @padding: padding
  *
  * Structure used by read(2) on /dev/vduse/$NAME.
  */
 struct vduse_dev_request {
 	__u32 type;
 	__u32 request_id;
 	__u32 reserved[4];
 	union {
 		struct vduse_vq_state vq_state;
 		struct vduse_dev_status s;
 		struct vduse_iova_range iova;
 		__u32 padding[32];
 	};
 };

 /**
  * struct vduse_dev_response - response to control request
  * @request_id: corresponding request id
  * @result: the result of request
  * @reserved: for future use, needs to be initialized to zero
  * @vq_state: virtqueue state
  * @padding: padding
  *
  * Structure used by write(2) on /dev/vduse/$NAME.
  */
 struct vduse_dev_response {
 	__u32 request_id;
 #define VDUSE_REQ_RESULT_OK	0x00
 #define VDUSE_REQ_RESULT_FAILED	0x01
 	__u32 result;
 	__u32 reserved[4];
 	union {
 		struct vduse_vq_state vq_state;
 		__u32 padding[32];
 	};
 };

 #endif /* _VDUSE_H_ */
	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
	#ifndef _VDUSE_H_
	#define _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 to vDPA bus.
	*/
	#define VDUSE_VQ_SETUP _IOW(VDUSE_BASE, 0x14, struct vduse_vq_config)

	/**
	* struct vduse_vq_state_split - split virtqueue state
	* @avail_index: available index
	*/
	struct vduse_vq_state_split {
	__u16 avail_index;
	};

	/**
	* struct vduse_vq_state_packed - packed virtqueue state
	* @last_avail_counter: last driver ring wrap counter observed by device
	* @last_avail_idx: device available index
	* @last_used_counter: device ring wrap counter
	* @last_used_idx: used index
	*/
	struct vduse_vq_state_packed {
	__u16 last_avail_counter;
	__u16 last_avail_idx;
	__u16 last_used_counter;
	__u16 last_used_idx;
	};

	/**
	* struct vduse_vq_info - information of a virtqueue
	* @index: virtqueue index
	* @num: the size of virtqueue
	* @desc_addr: address of desc area
	* @driver_addr: address of driver area
	* @device_addr: address of device area
	* @split: split virtqueue state
	* @packed: packed virtqueue state
	* @ready: ready status of virtqueue
	*
	* Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information.
	*/
	struct vduse_vq_info {
	__u32 index;
	__u32 num;
	__u64 desc_addr;
	__u64 driver_addr;
	__u64 device_addr;
	union {
	struct vduse_vq_state_split split;
	struct vduse_vq_state_packed packed;
	};
	__u8 ready;
	};

	/* Get the specified virtqueue's information. Caller should set index field. */
	#define VDUSE_VQ_GET_INFO _IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info)

	/**
	* struct vduse_vq_eventfd - eventfd configuration for a virtqueue
	* @index: virtqueue index
	* @fd: eventfd, -1 means de-assigning the eventfd
	*
	* Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd.
	*/
	struct vduse_vq_eventfd {
	__u32 index;
	#define VDUSE_EVENTFD_DEASSIGN -1
	int fd;
	};

	/*
	* Setup kick eventfd for specified virtqueue. The kick eventfd is used
	* by VDUSE kernel module to notify userspace to consume the avail vring.
	*/
	#define VDUSE_VQ_SETUP_KICKFD _IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd)

	/*
	* Inject an interrupt for specific virtqueue. It's used to notify virtio driver
	* to consume the used vring.
	*/
	#define VDUSE_VQ_INJECT_IRQ _IOW(VDUSE_BASE, 0x17, __u32)

	/* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */

	/**
	* enum vduse_req_type - request type
	* @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace
	* @VDUSE_SET_STATUS: set the device status
	* @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for
	* specified IOVA range via VDUSE_IOTLB_GET_FD ioctl
	*/
	enum vduse_req_type {
	VDUSE_GET_VQ_STATE,
	VDUSE_SET_STATUS,
	VDUSE_UPDATE_IOTLB,
	};

	/**
	* struct vduse_vq_state - virtqueue state
	* @index: virtqueue index
	* @split: split virtqueue state
	* @packed: packed virtqueue state
	*/
	struct vduse_vq_state {
	__u32 index;
	union {
	struct vduse_vq_state_split split;
	struct vduse_vq_state_packed packed;
	};
	};

	/**
	* struct vduse_dev_status - device status
	* @status: device status
	*/
	struct vduse_dev_status {
	__u8 status;
	};

	/**
	* struct vduse_iova_range - IOVA range [start, last]
	* @start: start of the IOVA range
	* @last: last of the IOVA range
	*/
	struct vduse_iova_range {
	__u64 start;
	__u64 last;
	};

	/**
	* struct vduse_dev_request - control request
	* @type: request type
	* @request_id: request id
	* @reserved: for future use
	* @vq_state: virtqueue state, only index field is available
	* @s: device status
	* @iova: IOVA range for updating
	* @padding: padding
	*
	* Structure used by read(2) on /dev/vduse/$NAME.
	*/
	struct vduse_dev_request {
	__u32 type;
	__u32 request_id;
	__u32 reserved[4];
	union {
	struct vduse_vq_state vq_state;
	struct vduse_dev_status s;
	struct vduse_iova_range iova;
	__u32 padding[32];
	};
	};

	/**
	* struct vduse_dev_response - response to control request
	* @request_id: corresponding request id
	* @result: the result of request
	* @reserved: for future use, needs to be initialized to zero
	* @vq_state: virtqueue state
	* @padding: padding
	*
	* Structure used by write(2) on /dev/vduse/$NAME.
	*/
	struct vduse_dev_response {
	__u32 request_id;
	#define VDUSE_REQ_RESULT_OK 0x00
	#define VDUSE_REQ_RESULT_FAILED 0x01
	__u32 result;
	__u32 reserved[4];
	union {
	struct vduse_vq_state vq_state;
	__u32 padding[32];
	};
	};

	#endif /* _VDUSE_H_ */