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vduse.h
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/* 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_ */