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/vringh.h> 10 #include <linux/vdpa.h> 11 #include <linux/virtio_byteorder.h> 12 #include <linux/vhost_iotlb.h> 13 #include <uapi/linux/virtio_config.h> 14 15 #define VDPASIM_FEATURES ((1ULL << VIRTIO_F_ANY_LAYOUT) | \ 16 (1ULL << VIRTIO_F_VERSION_1) | \ 17 (1ULL << VIRTIO_F_ACCESS_PLATFORM)) 18 19 struct vdpasim; 20 21 struct vdpasim_virtqueue { 22 struct vringh vring; 23 struct vringh_kiov in_iov; 24 struct vringh_kiov out_iov; 25 unsigned short head; 26 bool ready; 27 u64 desc_addr; 28 u64 device_addr; 29 u64 driver_addr; 30 u32 num; 31 void *private; 32 irqreturn_t (*cb)(void *data); 33 }; 34 35 struct vdpasim_dev_attr { 36 struct vdpa_mgmt_dev *mgmt_dev; 37 const char *name; 38 u64 supported_features; 39 size_t config_size; 40 size_t buffer_size; 41 int nvqs; 42 u32 id; 43 44 work_func_t work_fn; 45 void (*get_config)(struct vdpasim *vdpasim, void *config); 46 void (*set_config)(struct vdpasim *vdpasim, const void *config); 47 }; 48 49 /* State of each vdpasim device */ 50 struct vdpasim { 51 struct vdpa_device vdpa; 52 struct vdpasim_virtqueue *vqs; 53 struct work_struct work; 54 struct vdpasim_dev_attr dev_attr; 55 /* spinlock to synchronize virtqueue state */ 56 spinlock_t lock; 57 /* virtio config according to device type */ 58 void *config; 59 struct vhost_iotlb *iommu; 60 void *buffer; 61 u32 status; 62 u32 generation; 63 u64 features; 64 /* spinlock to synchronize iommu table */ 65 spinlock_t iommu_lock; 66 }; 67 68 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr); 69 70 /* TODO: cross-endian support */ 71 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim) 72 { 73 return virtio_legacy_is_little_endian() || 74 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1)); 75 } 76 77 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val) 78 { 79 return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val); 80 } 81 82 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val) 83 { 84 return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val); 85 } 86 87 static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val) 88 { 89 return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val); 90 } 91 92 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val) 93 { 94 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val); 95 } 96 97 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val) 98 { 99 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val); 100 } 101 102 static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val) 103 { 104 return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val); 105 } 106 107 #endif 108