1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2020, Red Hat Inc. All rights reserved.
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>
15 #define VDPASIM_FEATURES ((1ULL << VIRTIO_F_ANY_LAYOUT) | \
16 (1ULL << VIRTIO_F_VERSION_1) | \
17 (1ULL << VIRTIO_F_ACCESS_PLATFORM))
21 struct vdpasim_virtqueue {
23 struct vringh_kiov in_iov;
24 struct vringh_kiov out_iov;
32 irqreturn_t (*cb)(void *data);
35 struct vdpasim_dev_attr {
36 struct vdpa_mgmt_dev *mgmt_dev;
38 u64 supported_features;
45 void (*get_config)(struct vdpasim *vdpasim, void *config);
46 void (*set_config)(struct vdpasim *vdpasim, const void *config);
49 /* State of each vdpasim device */
51 struct vdpa_device vdpa;
52 struct vdpasim_virtqueue *vqs;
53 struct work_struct work;
54 struct vdpasim_dev_attr dev_attr;
55 /* spinlock to synchronize virtqueue state */
57 /* virtio config according to device type */
59 struct vhost_iotlb *iommu;
64 /* spinlock to synchronize iommu table */
65 spinlock_t iommu_lock;
68 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr);
70 /* TODO: cross-endian support */
71 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
73 return virtio_legacy_is_little_endian() ||
74 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
77 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
79 return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
82 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
84 return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
87 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
89 return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
92 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
94 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
97 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
99 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
102 static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
104 return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);