From: Will Deacon willdeacon@google.com
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: https://android.googlesource.com/platform/external/u-boot/+/f73258a4bfe968c5... --- drivers/virtio/virtio_ring.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 5aeb13fd59..1bd19add75 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -47,6 +47,10 @@ static unsigned int virtqueue_attach_desc(struct virtqueue *vq, unsigned int i, 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[], unsigned int out_sgs, unsigned int in_sgs) { @@ -165,10 +169,12 @@ static void detach_buf(struct virtqueue *vq, unsigned int head) i = head;
while (vq->vring_desc_shadow[i].flags & VRING_DESC_F_NEXT) { + virtqueue_detach_desc(vq, i); i = vq->vring_desc_shadow[i].next; vq->num_free++; }
+ virtqueue_detach_desc(vq, i); vq->vring_desc_shadow[i].next = vq->free_head; vq->free_head = head;