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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2020, Red Hat Inc. All rights reserved.
*/
#ifndef _VDPA_SIM_H
#define _VDPA_SIM_H
#include <linux/vringh.h>
#include <linux/vdpa.h>
#include <linux/virtio_byteorder.h>
#include <linux/vhost_iotlb.h>
#include <uapi/linux/virtio_config.h>
#define VDPASIM_FEATURES ((1ULL << VIRTIO_F_ANY_LAYOUT) | \
(1ULL << VIRTIO_F_VERSION_1) | \
(1ULL << VIRTIO_F_ACCESS_PLATFORM))
struct vdpasim;
struct vdpasim_virtqueue {
struct vringh vring;
struct vringh_kiov in_iov;
struct vringh_kiov out_iov;
unsigned short head;
bool ready;
u64 desc_addr;
u64 device_addr;
u64 driver_addr;
u32 num;
void *private;
irqreturn_t (*cb)(void *data);
};
struct vdpasim_dev_attr {
u64 supported_features;
size_t config_size;
size_t buffer_size;
int nvqs;
u32 id;
work_func_t work_fn;
void (*get_config)(struct vdpasim *vdpasim, void *config);
void (*set_config)(struct vdpasim *vdpasim, const void *config);
};
/* State of each vdpasim device */
struct vdpasim {
struct vdpa_device vdpa;
struct vdpasim_virtqueue *vqs;
struct work_struct work;
struct vdpasim_dev_attr dev_attr;
/* spinlock to synchronize virtqueue state */
spinlock_t lock;
/* virtio config according to device type */
void *config;
struct vhost_iotlb *iommu;
void *buffer;
u32 status;
u32 generation;
u64 features;
/* spinlock to synchronize iommu table */
spinlock_t iommu_lock;
};
struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr);
/* TODO: cross-endian support */
static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
{
return virtio_legacy_is_little_endian() ||
(vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
}
static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
{
return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
}
static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
{
return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
}
static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
{
return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
}
static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
{
return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
}
static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
{
return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
}
static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
{
return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);
}
#endif
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