100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/*-
|
|
* Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.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
|
|
|
|
struct virtqueue;
|
|
struct sglist;
|
|
|
|
/* Device callback for a virtqueue interrupt. */
|
|
typedef void virtqueue_intr_t(void *);
|
|
|
|
/*
|
|
* Hint on how long the next interrupt should be postponed. This is
|
|
* only used when the EVENT_IDX feature is negotiated.
|
|
*/
|
|
typedef enum {
|
|
VQ_POSTPONE_SHORT,
|
|
VQ_POSTPONE_LONG,
|
|
VQ_POSTPONE_EMPTIED /* Until all available desc are used. */
|
|
} vq_postpone_t;
|
|
|
|
#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 { \
|
|
snprintf((_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_filter(struct virtqueue *vq);
|
|
void virtqueue_intr(struct virtqueue *vq);
|
|
int virtqueue_enable_intr(struct virtqueue *vq);
|
|
int virtqueue_postpone_intr(struct virtqueue *vq, vq_postpone_t hint);
|
|
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_nfree(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 */
|