/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _UAPI_VDUSE_H_ #define _UAPI_VDUSE_H_ #include <linux/types.h> #define VDUSE_BASE … /* The ioctls for control device (/dev/vduse/control) */ #define VDUSE_API_VERSION … /* * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION). * This is used for future extension. */ #define VDUSE_GET_API_VERSION … /* Set the version of VDUSE API that userspace supported. */ #define VDUSE_SET_API_VERSION … /** * 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 { … }; /* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */ #define VDUSE_CREATE_DEV … /* * Destroy a VDUSE device. Make sure there are no more references * to the char device (/dev/vduse/$NAME). */ #define VDUSE_DESTROY_DEV … /* 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 { … }; /* * 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 … /* * 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 … /** * 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 { … }; /* Set device configuration space */ #define VDUSE_DEV_SET_CONFIG … /* * Inject a config interrupt. It's usually used to notify virtio driver * that device configuration space has changed. */ #define VDUSE_DEV_INJECT_CONFIG_IRQ … /** * 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 { … }; /* * Setup the specified virtqueue. Make sure all virtqueues have been * configured before the device is attached to vDPA bus. */ #define VDUSE_VQ_SETUP … /** * struct vduse_vq_state_split - split virtqueue state * @avail_index: available index */ struct vduse_vq_state_split { … }; /** * 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 { … }; /** * 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 { … }; /* Get the specified virtqueue's information. Caller should set index field. */ #define VDUSE_VQ_GET_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 { … }; /* * 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 … /* * Inject an interrupt for specific virtqueue. It's used to notify virtio driver * to consume the used vring. */ #define VDUSE_VQ_INJECT_IRQ … /** * struct vduse_iova_umem - userspace memory configuration for one IOVA region * @uaddr: start address of userspace memory, it must be aligned to page size * @iova: start of the IOVA region * @size: size of the IOVA region * @reserved: for future use, needs to be initialized to zero * * Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM * ioctls to register/de-register userspace memory for IOVA regions */ struct vduse_iova_umem { … }; /* Register userspace memory for IOVA regions */ #define VDUSE_IOTLB_REG_UMEM … /* De-register the userspace memory. Caller should set iova and size field. */ #define VDUSE_IOTLB_DEREG_UMEM … /** * struct vduse_iova_info - information of one IOVA region * @start: start of the IOVA region * @last: last of the IOVA region * @capability: capability of the IOVA regsion * @reserved: for future use, needs to be initialized to zero * * Structure used by VDUSE_IOTLB_GET_INFO ioctl to get information of * one IOVA region. */ struct vduse_iova_info { … }; /* * Find the first IOVA region that overlaps with the range [start, last] * and return some information on it. Caller should set start and last fields. */ #define VDUSE_IOTLB_GET_INFO … /* 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 { … }; /** * struct vduse_vq_state - virtqueue state * @index: virtqueue index * @split: split virtqueue state * @packed: packed virtqueue state */ struct vduse_vq_state { … }; /** * struct vduse_dev_status - device status * @status: device status */ struct vduse_dev_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 { … }; /** * 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/$NAME. */ struct vduse_dev_request { … }; /** * struct vduse_dev_response - response to control request * @request_id: corresponding request id * @result: the result of request * @reserved: for future use, needs to be initialized to zero * @vq_state: virtqueue state * @padding: padding * * Structure used by write(2) on /dev/vduse/$NAME. */ struct vduse_dev_response { … }; #endif /* _UAPI_VDUSE_H_ */
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