diff options
Diffstat (limited to 'drivers/vdpa/vdpa_sim/vdpa_sim.h')
-rw-r--r-- | drivers/vdpa/vdpa_sim/vdpa_sim.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h new file mode 100644 index 0000000000..bb137e4797 --- /dev/null +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h @@ -0,0 +1,121 @@ +/* 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/iova.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 { + struct vdpa_mgmt_dev *mgmt_dev; + const char *name; + u64 supported_features; + size_t alloc_size; + size_t config_size; + int nvqs; + u32 id; + u32 ngroups; + u32 nas; + + void (*work_fn)(struct vdpasim *vdpasim); + void (*get_config)(struct vdpasim *vdpasim, void *config); + void (*set_config)(struct vdpasim *vdpasim, const void *config); + int (*get_stats)(struct vdpasim *vdpasim, u16 idx, + struct sk_buff *msg, + struct netlink_ext_ack *extack); + void (*free)(struct vdpasim *vdpasim); +}; + +/* State of each vdpasim device */ +struct vdpasim { + struct vdpa_device vdpa; + struct vdpasim_virtqueue *vqs; + struct kthread_worker *worker; + struct kthread_work work; + struct mm_struct *mm_bound; + struct vdpasim_dev_attr dev_attr; + /* mutex to synchronize virtqueue state */ + struct mutex mutex; + /* virtio config according to device type */ + void *config; + struct vhost_iotlb *iommu; + bool *iommu_pt; + u32 status; + u32 generation; + u64 features; + u32 groups; + bool running; + bool pending_kick; + /* spinlock to synchronize iommu table */ + spinlock_t iommu_lock; +}; + +struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr, + const struct vdpa_dev_set_config *config); +void vdpasim_schedule_work(struct vdpasim *vdpasim); + +/* 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 |