On Thu, Sep 24, 2020 at 11:21:11AM +0800, Jason Wang wrote:
> This patch introduces a new bus operation to allow the vDPA bus driver
> to associate an ASID to a virtqueue group.
>
So in case of virtio_net, I would expect that all the data virtqueues
will be associated with the same address space identifier. Moreover,
this assignment should be provided before the set_map call that provides
the iotlb for the address space, correct?
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> include/linux/vdpa.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 1e1163daa352..e2394995a3cd 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -160,6 +160,12 @@ struct vdpa_device {
> * @get_generation: Get device config generation (optional)
> * @vdev: vdpa device
> * Returns u32: device generation
> + * @set_group_asid: Set address space identifier for a
> + * virtqueue group
> + * @vdev: vdpa device
> + * @group: virtqueue group
> + * @asid: address space id for this group
> + * Returns integer: success (0) or error (< 0)
> * @set_map: Set device memory mapping (optional)
> * Needed for device that using device
> * specific DMA translation (on-chip IOMMU)
> @@ -237,6 +243,10 @@ struct vdpa_config_ops {
> u64 iova, u64 size, u64 pa, u32 perm);
> int (*dma_unmap)(struct vdpa_device *vdev, unsigned int asid,
> u64 iova, u64 size);
> + int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
> + unsigned int asid);
> +
> +
Extra space
>
> /* Free device resources */
> void (*free)(struct vdpa_device *vdev);
> --
> 2.20.1
>
