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 */
vdpasim_is_little_endian(struct vdpasim * vdpasim)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
vdpasim16_to_cpu(struct vdpasim * vdpasim,__virtio16 val)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
cpu_to_vdpasim16(struct vdpasim * vdpasim,u16 val)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
vdpasim32_to_cpu(struct vdpasim * vdpasim,__virtio32 val)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
cpu_to_vdpasim32(struct vdpasim * vdpasim,u32 val)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
vdpasim64_to_cpu(struct vdpasim * vdpasim,__virtio64 val)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
cpu_to_vdpasim64(struct vdpasim * vdpasim,u64 val)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
122
