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/*-
* Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/

#ifndef _VIRTIO_VIRTQUEUE_H
#define _VIRTIO_VIRTQUEUE_H

#include <sys/types.h>

struct virtqueue;
struct sglist;

/* Support for indirect buffer descriptors. */
#define VIRTIO_RING_F_INDIRECT_DESC (1 << 28)

/* The guest publishes the used index for which it expects an interrupt
* at the end of the avail ring. Host should ignore the avail->flags field.
* The host publishes the avail index for which it expects a kick
* at the end of the used ring. Guest should ignore the used->flags field.
*/
#define VIRTIO_RING_F_EVENT_IDX (1 << 29)

/* Device callback for a virtqueue interrupt. */
typedef int virtqueue_intr_t(void *);

#define VIRTQUEUE_MAX_NAME_SZ 32

/* One for each virtqueue the device wishes to allocate. */
struct vq_alloc_info {
char vqai_name[VIRTQUEUE_MAX_NAME_SZ];
int vqai_maxindirsz;
virtqueue_intr_t *vqai_intr;
void *vqai_intr_arg;
struct virtqueue **vqai_vq;
};

#define VQ_ALLOC_INFO_INIT(_i,_nsegs,_intr,_arg,_vqp,_str,...) do { \
ksnprintf((_i)->vqai_name, VIRTQUEUE_MAX_NAME_SZ, _str, \
##__VA_ARGS__); \
(_i)->vqai_maxindirsz = (_nsegs); \
(_i)->vqai_intr = (_intr); \
(_i)->vqai_intr_arg = (_arg); \
(_i)->vqai_vq = (_vqp); \
} while (0)

uint64_t virtqueue_filter_features(uint64_t features);

int virtqueue_alloc(device_t dev, uint16_t queue, uint16_t size,
int align, vm_paddr_t highaddr, struct vq_alloc_info *info,
struct virtqueue **vqp);
void *virtqueue_drain(struct virtqueue *vq, int *last);
void virtqueue_free(struct virtqueue *vq);
int virtqueue_reinit(struct virtqueue *vq, uint16_t size);

int virtqueue_intr(struct virtqueue *vq);
int virtqueue_enable_intr(struct virtqueue *vq);
void virtqueue_disable_intr(struct virtqueue *vq);

/* Get physical address of the virtqueue ring. */
vm_paddr_t virtqueue_paddr(struct virtqueue *vq);

int virtqueue_full(struct virtqueue *vq);
int virtqueue_empty(struct virtqueue *vq);
int virtqueue_size(struct virtqueue *vq);
int virtqueue_nused(struct virtqueue *vq);
void virtqueue_notify(struct virtqueue *vq);
void virtqueue_dump(struct virtqueue *vq);

int virtqueue_enqueue(struct virtqueue *vq, void *cookie,
struct sglist *sg, int readable, int writable);
void *virtqueue_dequeue(struct virtqueue *vq, uint32_t *len);
void *virtqueue_poll(struct virtqueue *vq, uint32_t *len);

#endif /* _VIRTIO_VIRTQUEUE_H */
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