linux-kernel - [PATCH 3/5] virtio-vdpa: support per vq dma device

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Date:   Wed, 11 Jan 2023 14:28:07 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     elic@...dia.com, gdawar@....com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, tanuj.kamde@....com
Subject: [PATCH 3/5] virtio-vdpa: support per vq dma device

This patch adds the support of per vq dma device for virito-vDPA. vDPA
parents then are allowed to use different DMA devices. This is useful
for the parents that have software or emulated virtqueues.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/virtio/virtio_vdpa.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 9670cc79371d..d7f5af62ddaa 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -135,6 +135,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
+	struct device *dma_dev;
 	const struct vdpa_config_ops *ops = vdpa->config;
 	struct virtio_vdpa_vq_info *info;
 	struct vdpa_callback cb;
@@ -175,9 +176,15 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 
 	/* Create the vring */
 	align = ops->get_vq_align(vdpa);
-	vq = vring_create_virtqueue(index, max_num, align, vdev,
-				    true, may_reduce_num, ctx,
-				    virtio_vdpa_notify, callback, name);
+
+	if (ops->get_vq_dma_dev)
+		dma_dev = ops->get_vq_dma_dev(vdpa, index);
+	else
+		dma_dev = vdpa_get_dma_dev(vdpa);
+	vq = vring_create_virtqueue_dma(index, max_num, align, vdev,
+					true, may_reduce_num, ctx,
+					virtio_vdpa_notify, callback,
+					name, dma_dev);
 	if (!vq) {
 		err = -ENOMEM;
 		goto error_new_virtqueue;
-- 
2.25.1