/* Do DMA mapping by driver */
bool premapped;
+ /* Do unmap or not for desc. Just when premapped is False and
+ * use_dma_api is true, this is true.
+ */
+ bool do_unmap;
+
/* Head of free buffer list. */
unsigned int free_head;
/* Number we've added since last sync. */
{
u16 flags;
- if (!vq->use_dma_api)
+ if (!vq->do_unmap)
return;
flags = virtio16_to_cpu(vq->vq.vdev, desc->flags);
struct vring_desc_extra *extra = vq->split.desc_extra;
u16 flags;
- if (!vq->use_dma_api)
- goto out;
-
flags = extra[i].flags;
if (flags & VRING_DESC_F_INDIRECT) {
+ if (!vq->use_dma_api)
+ goto out;
+
dma_unmap_single(vring_dma_dev(vq),
extra[i].addr,
extra[i].len,
(flags & VRING_DESC_F_WRITE) ?
DMA_FROM_DEVICE : DMA_TO_DEVICE);
} else {
+ if (!vq->do_unmap)
+ goto out;
+
dma_unmap_page(vring_dma_dev(vq),
extra[i].addr,
extra[i].len,
}
/* Last one doesn't continue. */
desc[prev].flags &= cpu_to_virtio16(_vq->vdev, ~VRING_DESC_F_NEXT);
- if (!indirect && vq->use_dma_api)
+ if (!indirect && vq->do_unmap)
vq->split.desc_extra[prev & (vq->split.vring.num - 1)].flags &=
~VRING_DESC_F_NEXT;
VRING_DESC_F_INDIRECT));
BUG_ON(len == 0 || len % sizeof(struct vring_desc));
- if (vq->use_dma_api) {
+ if (vq->do_unmap) {
for (j = 0; j < len / sizeof(struct vring_desc); j++)
vring_unmap_one_split_indirect(vq, &indir_desc[j]);
}
{
u16 flags;
- if (!vq->use_dma_api)
- return;
-
flags = extra->flags;
if (flags & VRING_DESC_F_INDIRECT) {
+ if (!vq->use_dma_api)
+ return;
+
dma_unmap_single(vring_dma_dev(vq),
extra->addr, extra->len,
(flags & VRING_DESC_F_WRITE) ?
DMA_FROM_DEVICE : DMA_TO_DEVICE);
} else {
+ if (!vq->do_unmap)
+ return;
+
dma_unmap_page(vring_dma_dev(vq),
extra->addr, extra->len,
(flags & VRING_DESC_F_WRITE) ?
{
u16 flags;
- if (!vq->use_dma_api)
+ if (!vq->do_unmap)
return;
flags = le16_to_cpu(desc->flags);
sizeof(struct vring_packed_desc));
vq->packed.vring.desc[head].id = cpu_to_le16(id);
- if (vq->use_dma_api) {
+ if (vq->do_unmap) {
vq->packed.desc_extra[id].addr = addr;
vq->packed.desc_extra[id].len = total_sg *
sizeof(struct vring_packed_desc);
desc[i].len = cpu_to_le32(sg->length);
desc[i].id = cpu_to_le16(id);
- if (unlikely(vq->use_dma_api)) {
+ if (unlikely(vq->do_unmap)) {
vq->packed.desc_extra[curr].addr = addr;
vq->packed.desc_extra[curr].len = sg->length;
vq->packed.desc_extra[curr].flags =
vq->free_head = id;
vq->vq.num_free += state->num;
- if (unlikely(vq->use_dma_api)) {
+ if (unlikely(vq->do_unmap)) {
curr = id;
for (i = 0; i < state->num; i++) {
vring_unmap_extra_packed(vq,
if (!desc)
return;
- if (vq->use_dma_api) {
+ if (vq->do_unmap) {
len = vq->packed.desc_extra[id].len;
for (i = 0; i < len / sizeof(struct vring_packed_desc);
i++)
vq->dma_dev = dma_dev;
vq->use_dma_api = vring_use_dma_api(vdev);
vq->premapped = false;
+ vq->do_unmap = vq->use_dma_api;
vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
!context;
vq->dma_dev = dma_dev;
vq->use_dma_api = vring_use_dma_api(vdev);
vq->premapped = false;
+ vq->do_unmap = vq->use_dma_api;
vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
!context;
}
vq->premapped = true;
+ vq->do_unmap = false;
END_USE(vq);