introduce virtqueue_detach_unused_buf_dma() to collect the dma
info when get buf from virtio core for premapped mode.

If the virtio queue is premapped mode, the virtio-net send buf may
have many desc. Every desc dma address need to be unmap. So here we
introduce a new helper to collect the dma address of the buffer from
the virtio core.

Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 33 +++++++++++++++++++++++++--------
 include/linux/virtio.h       |  1 +
 2 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index ecbaf7568251..2c5089d3b510 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1012,7 +1012,7 @@ static bool virtqueue_enable_cb_delayed_split(struct 
virtqueue *_vq)
        return true;
 }
 
-static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
+static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq, struct 
virtio_dma_head *dma)
 {
        struct vring_virtqueue *vq = to_vvq(_vq);
        unsigned int i;
@@ -1025,7 +1025,7 @@ static void *virtqueue_detach_unused_buf_split(struct 
virtqueue *_vq)
                        continue;
                /* detach_buf_split clears data, so grab it now. */
                buf = vq->split.desc_state[i].data;
-               detach_buf_split(vq, i, NULL, NULL);
+               detach_buf_split(vq, i, dma, NULL);
                vq->split.avail_idx_shadow--;
                vq->split.vring.avail->idx = cpu_to_virtio16(_vq->vdev,
                                vq->split.avail_idx_shadow);
@@ -1909,7 +1909,7 @@ static bool virtqueue_enable_cb_delayed_packed(struct 
virtqueue *_vq)
        return true;
 }
 
-static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
+static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq, struct 
virtio_dma_head *dma)
 {
        struct vring_virtqueue *vq = to_vvq(_vq);
        unsigned int i;
@@ -1922,7 +1922,7 @@ static void *virtqueue_detach_unused_buf_packed(struct 
virtqueue *_vq)
                        continue;
                /* detach_buf clears data, so grab it now. */
                buf = vq->packed.desc_state[i].data;
-               detach_buf_packed(vq, i, NULL, NULL);
+               detach_buf_packed(vq, i, dma, NULL);
                END_USE(vq);
                return buf;
        }
@@ -2614,19 +2614,36 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
 EXPORT_SYMBOL_GPL(virtqueue_enable_cb_delayed);
 
 /**
- * virtqueue_detach_unused_buf - detach first unused buffer
+ * virtqueue_detach_unused_buf_dma - detach first unused buffer
  * @_vq: the struct virtqueue we're talking about.
+ * @dma: the head of the array to store the dma info
+ *
+ * more see virtqueue_get_buf_ctx_dma()
  *
  * Returns NULL or the "data" token handed to virtqueue_add_*().
  * This is not valid on an active queue; it is useful for device
  * shutdown or the reset queue.
  */
-void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
+void *virtqueue_detach_unused_buf_dma(struct virtqueue *_vq, struct 
virtio_dma_head *dma)
 {
        struct vring_virtqueue *vq = to_vvq(_vq);
 
-       return vq->packed_ring ? virtqueue_detach_unused_buf_packed(_vq) :
-                                virtqueue_detach_unused_buf_split(_vq);
+       return vq->packed_ring ? virtqueue_detach_unused_buf_packed(_vq, dma) :
+                                virtqueue_detach_unused_buf_split(_vq, dma);
+}
+EXPORT_SYMBOL_GPL(virtqueue_detach_unused_buf_dma);
+
+/**
+ * virtqueue_detach_unused_buf - detach first unused buffer
+ * @_vq: the struct virtqueue we're talking about.
+ *
+ * Returns NULL or the "data" token handed to virtqueue_add_*().
+ * This is not valid on an active queue; it is useful for device
+ * shutdown or the reset queue.
+ */
+void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
+{
+       return virtqueue_detach_unused_buf_dma(_vq, NULL);
 }
 EXPORT_SYMBOL_GPL(virtqueue_detach_unused_buf);
 
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 7a5e9ea7d420..2596f0e7e395 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -104,6 +104,7 @@ bool virtqueue_poll(struct virtqueue *vq, unsigned);
 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
 
 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
+void *virtqueue_detach_unused_buf_dma(struct virtqueue *_vq, struct 
virtio_dma_head *dma);
 
 unsigned int virtqueue_get_vring_size(const struct virtqueue *vq);
 
-- 
2.32.0.3.g01195cf9f


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