LXR linux/drivers/vdpa/vdpa_sim/vdpa

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (c) 2020, Red Hat Inc. All rights reserved.
   4 */
   5
   6#ifndef _VDPA_SIM_H
   7#define _VDPA_SIM_H
   8
   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 config_size;
  41        size_t buffer_size;
  42        int nvqs;
  43        u32 id;
  44
  45        work_func_t work_fn;
  46        void (*get_config)(struct vdpasim *vdpasim, void *config);
  47        void (*set_config)(struct vdpasim *vdpasim, const void *config);
  48};
  49
  50/* State of each vdpasim device */
  51struct vdpasim {
  52        struct vdpa_device vdpa;
  53        struct vdpasim_virtqueue *vqs;
  54        struct work_struct work;
  55        struct vdpasim_dev_attr dev_attr;
  56        /* spinlock to synchronize virtqueue state */
  57        spinlock_t lock;
  58        /* virtio config according to device type */
  59        void *config;
  60        struct vhost_iotlb *iommu;
  61        struct iova_domain iova;
  62        void *buffer;
  63        u32 status;
  64        u32 generation;
  65        u64 features;
  66        /* spinlock to synchronize iommu table */
  67        spinlock_t iommu_lock;
  68};
  69
  70struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr);
  71
  72/* TODO: cross-endian support */
  73static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
  74{
  75        return virtio_legacy_is_little_endian() ||
  76                (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
  77}
  78
  79static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
  80{
  81        return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  82}
  83
  84static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
  85{
  86        return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
  87}
  88
  89static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
  90{
  91        return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  92}
  93
  94static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
  95{
  96        return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
  97}
  98
  99static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
 100{
 101        return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
 102}
 103
 104static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
 105{
 106        return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);
 107}
 108
 109#endif
 110