/* 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_ */