The virtio-net sets the premapped mode by find_vqs(). So the below API is not used by anyone, we remove it. int virtqueue_set_dma_premapped(struct virtqueue *_vq); Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> --- drivers/virtio/virtio_ring.c | 56 ------------------------------------ include/linux/virtio.h | 2 -- 2 files changed, 58 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 103b06574e8b..63084487c171 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2775,62 +2775,6 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num, } EXPORT_SYMBOL_GPL(virtqueue_resize); -/** - * virtqueue_set_dma_premapped - set the vring premapped mode - * @_vq: the struct virtqueue we're talking about. - * - * Enable the premapped mode of the vq. - * - * The vring in premapped mode does not do dma internally, so the driver must - * do dma mapping in advance. The driver must pass the dma_address through - * dma_address of scatterlist. When the driver got a used buffer from - * the vring, it has to unmap the dma address. - * - * This function must be called immediately after creating the vq, or after vq - * reset, and before adding any buffers to it. - * - * Caller must ensure we don't call this with other virtqueue operations - * at the same time (except where noted). - * - * Returns zero or a negative error. - * 0: success. - * -EINVAL: vring does not use the dma api, so we can not enable premapped mode. - */ -int virtqueue_set_dma_premapped(struct virtqueue *_vq) -{ - struct vring_virtqueue *vq = to_vvq(_vq); - u32 num; - - START_USE(vq); - - num = vq->packed_ring ? vq->packed.vring.num : vq->split.vring.num; - - if (num != vq->vq.num_free) { - END_USE(vq); - return -EINVAL; - } - - if (!vq->use_dma_api) { - END_USE(vq); - return -EINVAL; - } - - vq->vq.premapped = true; - - if (vq->packed_ring) { - kfree(vq->packed.desc_dma); - vq->packed.desc_dma = NULL; - } else { - kfree(vq->split.desc_dma); - vq->split.desc_dma = NULL; - } - - END_USE(vq); - - return 0; -} -EXPORT_SYMBOL_GPL(virtqueue_set_dma_premapped); - /** * virtqueue_reset - detach and recycle all unused buffers * @_vq: the struct virtqueue we're talking about. diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 407277d5a16b..2167893313f6 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -82,8 +82,6 @@ bool virtqueue_enable_cb(struct virtqueue *vq); unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq); -int virtqueue_set_dma_premapped(struct virtqueue *_vq); - bool virtqueue_poll(struct virtqueue *vq, unsigned); bool virtqueue_enable_cb_delayed(struct virtqueue *vq); -- 2.32.0.3.g01195cf9f