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 size_t buffer_size;
43 int nvqs;
44 u32 id;
45 u32 ngroups;
46 u32 nas;
47
48 work_func_t work_fn;
49 void (*get_config)(struct vdpasim *vdpasim, void *config);
50 void (*set_config)(struct vdpasim *vdpasim, const void *config);
51 int (*get_stats)(struct vdpasim *vdpasim, u16 idx,
52 struct sk_buff *msg,
53 struct netlink_ext_ack *extack);
54 };
55
56 /* State of each vdpasim device */
57 struct vdpasim {
58 struct vdpa_device vdpa;
59 struct vdpasim_virtqueue *vqs;
60 struct work_struct work;
61 struct vdpasim_dev_attr dev_attr;
62 /* spinlock to synchronize virtqueue state */
63 spinlock_t lock;
64 /* virtio config according to device type */
65 void *config;
66 struct vhost_iotlb *iommu;
67 bool *iommu_pt;
68 void *buffer;
69 u32 status;
70 u32 generation;
71 u64 features;
72 u32 groups;
73 bool running;
74 bool pending_kick;
75 /* spinlock to synchronize iommu table */
76 spinlock_t iommu_lock;
77 };
78
79 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
80 const struct vdpa_dev_set_config *config);
81
82 /* TODO: cross-endian support */
vdpasim_is_little_endian(struct vdpasim * vdpasim)83 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
84 {
85 return virtio_legacy_is_little_endian() ||
86 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
87 }
88
vdpasim16_to_cpu(struct vdpasim * vdpasim,__virtio16 val)89 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
90 {
91 return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
92 }
93
cpu_to_vdpasim16(struct vdpasim * vdpasim,u16 val)94 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
95 {
96 return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
97 }
98
vdpasim32_to_cpu(struct vdpasim * vdpasim,__virtio32 val)99 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
100 {
101 return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
102 }
103
cpu_to_vdpasim32(struct vdpasim * vdpasim,u32 val)104 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
105 {
106 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
107 }
108
vdpasim64_to_cpu(struct vdpasim * vdpasim,__virtio64 val)109 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
110 {
111 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
112 }
113
cpu_to_vdpasim64(struct vdpasim * vdpasim,u64 val)114 static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
115 {
116 return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);
117 }
118
119 #endif
120