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 config_size;
41 size_t buffer_size;
42 int nvqs;
43 u32 id;
44 u32 ngroups;
45 u32 nas;
46
47 work_func_t work_fn;
48 void (*get_config)(struct vdpasim *vdpasim, void *config);
49 void (*set_config)(struct vdpasim *vdpasim, const void *config);
50 };
51
52 /* State of each vdpasim device */
53 struct vdpasim {
54 struct vdpa_device vdpa;
55 struct vdpasim_virtqueue *vqs;
56 struct work_struct work;
57 struct vdpasim_dev_attr dev_attr;
58 /* spinlock to synchronize virtqueue state */
59 spinlock_t lock;
60 /* virtio config according to device type */
61 void *config;
62 struct vhost_iotlb *iommu;
63 struct iova_domain iova;
64 void *buffer;
65 u32 status;
66 u32 generation;
67 u64 features;
68 u32 groups;
69 bool running;
70 /* spinlock to synchronize iommu table */
71 spinlock_t iommu_lock;
72 };
73
74 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
75 const struct vdpa_dev_set_config *config);
76
77 /* TODO: cross-endian support */
vdpasim_is_little_endian(struct vdpasim * vdpasim)78 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
79 {
80 return virtio_legacy_is_little_endian() ||
81 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
82 }
83
vdpasim16_to_cpu(struct vdpasim * vdpasim,__virtio16 val)84 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
85 {
86 return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
87 }
88
cpu_to_vdpasim16(struct vdpasim * vdpasim,u16 val)89 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
90 {
91 return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
92 }
93
vdpasim32_to_cpu(struct vdpasim * vdpasim,__virtio32 val)94 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
95 {
96 return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
97 }
98
cpu_to_vdpasim32(struct vdpasim * vdpasim,u32 val)99 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
100 {
101 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
102 }
103
vdpasim64_to_cpu(struct vdpasim * vdpasim,__virtio64 val)104 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
105 {
106 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
107 }
108
cpu_to_vdpasim64(struct vdpasim * vdpasim,u64 val)109 static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
110 {
111 return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);
112 }
113
114 #endif
115