[PATCH v7 24/24] iommu: Convert remaining simple drivers to domain_alloc_paging()

[Jerry Snitselaar]

On Wed, Aug 23, 2023 at 01:47:38PM -0300, Jason Gunthorpe wrote:
> These drivers don't support IOMMU_DOMAIN_DMA, so this commit effectively
> allows them to support that mode.
> 
> The prior work to require default_domains makes this safe because every
> one of these drivers is either compilation incompatible with dma-iommu.c,
> or already establishing a default_domain. In both cases alloc_domain()
> will never be called with IOMMU_DOMAIN_DMA for these drivers so it is safe
> to drop the test.
> 
> Removing these tests clarifies that the domain allocation path is only
> about the functionality of a paging domain and has nothing to do with
> policy of how the paging domain is used for UNMANAGED/DMA/DMA_FQ.
> 
> Tested-by: Niklas Schnelle <schnelle at linux.ibm.com>
> Tested-by: Steven Price <steven.price at arm.com>
> Tested-by: Marek Szyprowski <m.szyprowski at samsung.com>
> Tested-by: Nicolin Chen <nicolinc at nvidia.com>
> Reviewed-by: Lu Baolu <baolu.lu at linux.intel.com>
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
> ---
>  drivers/iommu/msm_iommu.c    | 7 ++-----
>  drivers/iommu/mtk_iommu_v1.c | 7 ++-----
>  drivers/iommu/omap-iommu.c   | 7 ++-----
>  drivers/iommu/s390-iommu.c   | 7 ++-----
>  4 files changed, 8 insertions(+), 20 deletions(-)
> 

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