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(little_endian: 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(little_endian: 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(little_endian: 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(little_endian: 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(little_endian: 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(little_endian: vdpasim_is_little_endian(vdpasim), val); |
119 | } |
120 | |
121 | #endif |
122 | |