drivers/vdpa/vdpa_sim/vdpa_sim.h

   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/vringh.h>
  10 #include <linux/vdpa.h>
  11 #include <linux/virtio_byteorder.h>
  12 #include <linux/vhost_iotlb.h>
  13 #include <uapi/linux/virtio_config.h>
  14
  15 #define VDPASIM_FEATURES        ((1ULL << VIRTIO_F_ANY_LAYOUT) | \
  16                                  (1ULL << VIRTIO_F_VERSION_1)  | \
  17                                  (1ULL << VIRTIO_F_ACCESS_PLATFORM))
  18
  19 struct vdpasim;
  20
  21 struct vdpasim_virtqueue {
  22         struct vringh vring;
  23         struct vringh_kiov in_iov;
  24         struct vringh_kiov out_iov;
  25         unsigned short head;
  26         bool ready;
  27         u64 desc_addr;
  28         u64 device_addr;
  29         u64 driver_addr;
  30         u32 num;
  31         void *private;
  32         irqreturn_t (*cb)(void *data);
  33 };
  34
  35 struct vdpasim_dev_attr {
  36         u64 supported_features;
  37         size_t config_size;
  38         size_t buffer_size;
  39         int nvqs;
  40         u32 id;
  41
  42         work_func_t work_fn;
  43         void (*get_config)(struct vdpasim *vdpasim, void *config);
  44         void (*set_config)(struct vdpasim *vdpasim, const void *config);
  45 };
  46
  47 /* State of each vdpasim device */
  48 struct vdpasim {
  49         struct vdpa_device vdpa;
  50         struct vdpasim_virtqueue *vqs;
  51         struct work_struct work;
  52         struct vdpasim_dev_attr dev_attr;
  53         /* spinlock to synchronize virtqueue state */
  54         spinlock_t lock;
  55         /* virtio config according to device type */
  56         void *config;
  57         struct vhost_iotlb *iommu;
  58         void *buffer;
  59         u32 status;
  60         u32 generation;
  61         u64 features;
  62         /* spinlock to synchronize iommu table */
  63         spinlock_t iommu_lock;
  64 };
  65
  66 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr);
  67
  68 /* TODO: cross-endian support */
  69 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
  70 {
  71         return virtio_legacy_is_little_endian() ||
  72                 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
  73 }
  74
  75 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
  76 {
  77         return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  78 }
  79
  80 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
  81 {
  82         return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
  83 }
  84
  85 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
  86 {
  87         return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  88 }
  89
  90 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
  91 {
  92         return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
  93 }
  94
  95 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
  96 {
  97         return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  98 }
  99
 100 static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
 101 {
 102         return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);
 103 }
 104
 105 #endif