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virtio: Add helper functions to attach/detach vring descriptors

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Move the attach and detach logic for manipulating vring descriptors
out into their own functions so that we can later extend these to
bounce the data for devices with VIRTIO_F_IOMMU_PLATFORM set.

Signed-off-by: Will Deacon <willdeacon@google.com>
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Link: f73258a4bf
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Will Deacon 2023-03-29 22:24:58 +08:00 committed by Tom Rini
parent 75582fc2e6
commit a15d67e01a
1 changed files with 6 additions and 0 deletions
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6
drivers/virtio/virtio_ring.c
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@ -47,6 +47,10 @@ static unsigned int virtqueue_attach_desc(struct virtqueue *vq, unsigned int i,
return desc_shadow->next; return desc_shadow->next;
} }
static void virtqueue_detach_desc(struct virtqueue *vq, unsigned int idx)
{
}
int virtqueue_add(struct virtqueue *vq, struct virtio_sg *sgs[], int virtqueue_add(struct virtqueue *vq, struct virtio_sg *sgs[],
unsigned int out_sgs, unsigned int in_sgs) unsigned int out_sgs, unsigned int in_sgs)
{ {
@ -165,10 +169,12 @@ static void detach_buf(struct virtqueue *vq, unsigned int head)
i = head; i = head;
while (vq->vring_desc_shadow[i].flags & VRING_DESC_F_NEXT) { while (vq->vring_desc_shadow[i].flags & VRING_DESC_F_NEXT) {
virtqueue_detach_desc(vq, i);
i = vq->vring_desc_shadow[i].next; i = vq->vring_desc_shadow[i].next;
vq->num_free++; vq->num_free++;
} }
virtqueue_detach_desc(vq, i);
vq->vring_desc_shadow[i].next = vq->free_head; vq->vring_desc_shadow[i].next = vq->free_head;
vq->free_head = head; vq->free_head = head;