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/******************************************************************************
* Copyright (c) 2011 IBM Corporation
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
#ifndef _LIBVIRTIO_H
#define _LIBVIRTIO_H
#include <stdint.h>
/* Device status bits */
#define VIRTIO_STAT_ACKNOWLEDGE 1
#define VIRTIO_STAT_DRIVER 2
#define VIRTIO_STAT_DRIVER_OK 4
#define VIRTIO_STAT_FEATURES_OK 8
#define VIRTIO_STAT_NEEDS_RESET 64
#define VIRTIO_STAT_FAILED 128
#define BIT(x) (1UL << (x))
/* VIRTIO 1.0 Device independent feature bits */
#define VIRTIO_F_RING_INDIRECT_DESC BIT(28)
#define VIRTIO_F_RING_EVENT_IDX BIT(29)
#define VIRTIO_F_VERSION_1 BIT(32)
#define VIRTIO_TIMEOUT 5000 /* 5 sec timeout */
/* Definitions for vring_desc.flags */
#define VRING_DESC_F_NEXT 1 /* buffer continues via the next field */
#define VRING_DESC_F_WRITE 2 /* buffer is write-only (otherwise read-only) */
#define VRING_DESC_F_INDIRECT 4 /* buffer contains a list of buffer descriptors */
/* Descriptor table entry - see Virtio Spec chapter 2.3.2 */
struct vring_desc {
uint64_t addr; /* Address (guest-physical) */
uint32_t len; /* Length */
uint16_t flags; /* The flags as indicated above */
uint16_t next; /* Next field if flags & NEXT */
};
/* Definitions for vring_avail.flags */
#define VRING_AVAIL_F_NO_INTERRUPT 1
/* Available ring - see Virtio Spec chapter 2.3.4 */
struct vring_avail {
uint16_t flags;
uint16_t idx;
uint16_t ring[];
};
/* Definitions for vring_used.flags */
#define VRING_USED_F_NO_NOTIFY 1
struct vring_used_elem {
uint32_t id; /* Index of start of used descriptor chain */
uint32_t len; /* Total length of the descriptor chain which was used */
};
struct vring_used {
uint16_t flags;
uint16_t idx;
struct vring_used_elem ring[];
};
/* Structure shared with SLOF and is 16bytes */
struct virtio_cap {
void *addr;
uint8_t bar;
uint8_t is_io;
uint8_t cap_id;
};
struct vqs {
uint32_t size;
void *buf_mem;
struct vring_desc *desc;
struct vring_avail *avail;
struct vring_used *used;
};
struct virtio_device {
uint64_t features;
struct virtio_cap legacy;
struct virtio_cap common;
struct virtio_cap notify;
struct virtio_cap isr;
struct virtio_cap device;
struct virtio_cap pci;
uint32_t notify_off_mul;
struct vqs vq[3];
};
/* Parts of the virtqueue are aligned on a 4096 byte page boundary */
#define VQ_ALIGN(addr) (((addr) + 0xfff) & ~0xfff)
extern unsigned long virtio_vring_size(unsigned int qsize);
extern unsigned int virtio_get_qsize(struct virtio_device *dev, int queue);
extern struct vring_desc *virtio_get_vring_desc(struct virtio_device *dev, int queue);
extern struct vring_avail *virtio_get_vring_avail(struct virtio_device *dev, int queue);
extern struct vring_used *virtio_get_vring_used(struct virtio_device *dev, int queue);
extern void virtio_fill_desc(struct vqs *vq, int id, uint64_t features,
uint64_t addr, uint32_t len,
uint16_t flags, uint16_t next);
extern struct vqs *virtio_queue_init_vq(struct virtio_device *dev, unsigned int id);
extern void virtio_queue_term_vq(struct virtio_device *dev, struct vqs *vq, unsigned int id);
extern struct virtio_device *virtio_setup_vd(void);
extern void virtio_reset_device(struct virtio_device *dev);
extern void virtio_queue_notify(struct virtio_device *dev, int queue);
extern void virtio_set_status(struct virtio_device *dev, int status);
extern void virtio_get_status(struct virtio_device *dev, int *status);
extern void virtio_set_guest_features(struct virtio_device *dev, uint64_t features);
extern uint64_t virtio_get_host_features(struct virtio_device *dev);
extern int virtio_negotiate_guest_features(struct virtio_device *dev, uint64_t features);
extern uint64_t virtio_get_config(struct virtio_device *dev, int offset, int size);
extern int __virtio_read_config(struct virtio_device *dev, void *dst,
int offset, int len);
#endif /* _LIBVIRTIO_H */
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