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
 20struct vdpasim;
 21
 22struct 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
 36struct 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 */
 57struct 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
 80struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
 81			       const struct vdpa_dev_set_config *config);
 82void vdpasim_schedule_work(struct vdpasim *vdpasim);
 83
 84/* TODO: cross-endian support */
 85static 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
 91static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
 92{
 93	return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
 94}
 95
 96static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
 97{
 98	return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
 99}
100
101static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
102{
103	return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
104}
105
106static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
107{
108	return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
109}
110
111static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
112{
113	return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
114}
115
116static 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