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 /* spinlock to synchronize iommu table */ 70 spinlock_t iommu_lock; 71 }; 72 73 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr); 74 75 /* TODO: cross-endian support */ 76 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim) 77 { 78 return virtio_legacy_is_little_endian() || 79 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1)); 80 } 81 82 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val) 83 { 84 return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val); 85 } 86 87 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val) 88 { 89 return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val); 90 } 91 92 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val) 93 { 94 return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val); 95 } 96 97 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val) 98 { 99 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val); 100 } 101 102 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val) 103 { 104 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val); 105 } 106 107 static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val) 108 { 109 return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val); 110 } 111 112 #endif 113