Hi Si-Wei:
On Sat, Sep 9, 2023 at 9:34 PM Si-Wei Liu <si-wei.liu@xxxxxxxxxx> wrote:
>
> On-chip IOMMU parent driver could use it to restore memory mapping
> to the initial state.
As discussed before. On-chip IOMMU is the hardware details that need
to be hidden by the vDPA bus.
Exposing this will complicate the implementation of bus drivers.
Thanks
>
> Signed-off-by: Si-Wei Liu <si-wei.liu@xxxxxxxxxx>
> ---
> include/linux/vdpa.h | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 17a4efa..daecf55 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -324,6 +324,12 @@ struct vdpa_map_file {
> * @iova: iova to be unmapped
> * @size: size of the area
> * Returns integer: success (0) or error (< 0)
> + * @reset_map: Reset device memory mapping (optional)
> + * Needed for device that using device
> + * specific DMA translation (on-chip IOMMU)
> + * @vdev: vdpa device
> + * @asid: address space identifier
> + * Returns integer: success (0) or error (< 0)
> * @get_vq_dma_dev: Get the dma device for a specific
> * virtqueue (optional)
> * @vdev: vdpa device
> @@ -401,6 +407,7 @@ struct vdpa_config_ops {
> u64 iova, u64 size, u64 pa, u32 perm, void *opaque);
> int (*dma_unmap)(struct vdpa_device *vdev, unsigned int asid,
> u64 iova, u64 size);
> + int (*reset_map)(struct vdpa_device *vdev, unsigned int asid);
> int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
> unsigned int asid);
> struct device *(*get_vq_dma_dev)(struct vdpa_device *vdev, u16 idx);
> --
> 1.8.3.1
>
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