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