122 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (c) 2020, Red Hat Inc. All rights reserved.4 */5 6#ifndef _VDPA_SIM_H7#define _VDPA_SIM_H8 9#include <linux/iova.h>10#include <linux/vringh.h>11#include <linux/vdpa.h>12#include <linux/virtio_byteorder.h>13#include <linux/vhost_iotlb.h>14#include <uapi/linux/virtio_config.h>15 16#define VDPASIM_FEATURES ((1ULL << VIRTIO_F_ANY_LAYOUT) | \17 (1ULL << VIRTIO_F_VERSION_1) | \18 (1ULL << VIRTIO_F_ACCESS_PLATFORM))19 20struct vdpasim;21 22struct vdpasim_virtqueue {23 struct vringh vring;24 struct vringh_kiov in_iov;25 struct vringh_kiov out_iov;26 unsigned short head;27 bool ready;28 u64 desc_addr;29 u64 device_addr;30 u64 driver_addr;31 u32 num;32 void *private;33 irqreturn_t (*cb)(void *data);34};35 36struct vdpasim_dev_attr {37 struct vdpa_mgmt_dev *mgmt_dev;38 const char *name;39 u64 supported_features;40 size_t alloc_size;41 size_t config_size;42 int nvqs;43 u32 id;44 u32 ngroups;45 u32 nas;46 47 void (*work_fn)(struct vdpasim *vdpasim);48 void (*get_config)(struct vdpasim *vdpasim, void *config);49 void (*set_config)(struct vdpasim *vdpasim, const void *config);50 int (*get_stats)(struct vdpasim *vdpasim, u16 idx,51 struct sk_buff *msg,52 struct netlink_ext_ack *extack);53 void (*free)(struct vdpasim *vdpasim);54};55 56/* State of each vdpasim device */57struct vdpasim {58 struct vdpa_device vdpa;59 struct vdpasim_virtqueue *vqs;60 struct kthread_worker *worker;61 struct kthread_work work;62 struct mm_struct *mm_bound;63 struct vdpasim_dev_attr dev_attr;64 /* mutex to synchronize virtqueue state */65 struct mutex mutex;66 /* virtio config according to device type */67 void *config;68 struct vhost_iotlb *iommu;69 bool *iommu_pt;70 u32 status;71 u32 generation;72 u64 features;73 u32 groups;74 bool running;75 bool pending_kick;76 /* spinlock to synchronize iommu table */77 spinlock_t iommu_lock;78};79 80struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,81 const struct vdpa_dev_set_config *config);82void vdpasim_schedule_work(struct vdpasim *vdpasim);83 84/* TODO: cross-endian support */85static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)86{87 return virtio_legacy_is_little_endian() ||88 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));89}90 91static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)92{93 return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);94}95 96static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)97{98 return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);99}100 101static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)102{103 return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);104}105 106static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)107{108 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);109}110 111static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)112{113 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);114}115 116static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)117{118 return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);119}120 121#endif122