From a15d67e01abee6f091a4bcde22fd5e0649590944 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Wed, 29 Mar 2023 22:24:58 +0800 Subject: [PATCH] virtio: Add helper functions to attach/detach vring descriptors 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 [ Paul: pick from the Android tree. Rebase to the upstream ] Signed-off-by: Ying-Chun Liu (PaulLiu) Cc: Bin Meng Link: https://android.googlesource.com/platform/external/u-boot/+/f73258a4bfe968c5f935db45f2ec5cc0104ee796 Reviewed-by: Simon Glass --- 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; -- 2.39.5