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 */ 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 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 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 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 } 103 104 static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val) 105 { 106 return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val); 107 } 108 109 static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val) 110 { 111 return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val); 112 } 113 114 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