[PATCH v7 07/24] iommu/mtk_iommu_v1: Implement an IDENTITY domain

[Jerry Snitselaar]

On Wed, Aug 23, 2023 at 01:47:21PM -0300, Jason Gunthorpe wrote:
> What mtk does during mtk_iommu_v1_set_platform_dma() is actually putting
> the iommu into identity mode. Make this available as a proper IDENTITY
> domain.
> 
> The mtk_iommu_v1_def_domain_type() from
> commit 8bbe13f52cb7 ("iommu/mediatek-v1: Add def_domain_type") explains
> this was needed to allow probe_finalize() to be called, but now the
> IDENTITY domain will do the same job so change the returned
> def_domain_type.
> 
> mkt_v1 is the only driver that returns IOMMU_DOMAIN_UNMANAGED from
> def_domain_type().  This allows the next patch to enforce an IDENTITY
> domain policy for this driver.
> 
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
> ---
>  drivers/iommu/mtk_iommu_v1.c | 21 +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 

Reviewed-by: Jerry Snitselaar <jsnitsel at redhat.com>