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virtio: Add improved queue allocation API

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This leaves vring_new_virtqueue alone for compatbility, but it
adds two new improved APIs:

vring_create_virtqueue: Creates a virtqueue backed by automatically
allocated coherent memory.  (Some day it this could be extended to
support non-coherent memory, too, if there ends up being a platform
on which it's worthwhile.)

__vring_new_virtqueue: Creates a virtqueue with a manually-specified
layout.  This should allow mic_virtio to work much more cleanly.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Andy Lutomirski 2016-02-02 21:46:37 -08:00 • committed by Michael S. Tsirkin
parent 780bc7903a
commit 2a2d1382fe
3 changed files with 236 additions and 33 deletions
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23
include/linux/virtio.h
View file

@ -75,8 +75,27 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
bool virtqueue_is_broken(struct virtqueue *vq);
void *virtqueue_get_avail(struct virtqueue *vq);
void *virtqueue_get_used(struct virtqueue *vq);
const struct vring *virtqueue_get_vring(struct virtqueue *vq);
dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq);
dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq);
dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);
/*
* Legacy accessors -- in almost all cases, these are the wrong functions
* to use.
*/
static inline void *virtqueue_get_desc(struct virtqueue *vq)
{
return virtqueue_get_vring(vq)->desc;
}
static inline void *virtqueue_get_avail(struct virtqueue *vq)
{
return virtqueue_get_vring(vq)->avail;
}
static inline void *virtqueue_get_used(struct virtqueue *vq)
{
return virtqueue_get_vring(vq)->used;
}
/**
* virtio_device - representation of a device using virtio