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/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
  20 struct vdpasim;
  21
  22 struct 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
  36 struct 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 */
  57 struct 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
  80 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
  81                                const struct vdpa_dev_set_config *config);
  82 void vdpasim_schedule_work(struct vdpasim *vdpasim);
  83
  84 /* TODO: cross-endian support */
  85 static 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
  91 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
  92 {
  93         return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  94 }
  95
  96 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
  97 {
  98         return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
  99 }
 100
 101 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
 102 {
 103         return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
 104 }
 105
 106 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
 107 {
 108         return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
 109 }
 110
 111 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
 112 {
 113         return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
 114 }
 115
 116 static 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 #endif