Re: [PATCH v6 25/25] iommu: Convert remaining simple drivers to domain_alloc_paging()

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On 2023/8/3 8:08, 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@xxxxxxxxxxxxx>
Tested-by: Steven Price<steven.price@xxxxxxx>
Tested-by: Marek Szyprowski<m.szyprowski@xxxxxxxxxxx>
Tested-by: Nicolin Chen<nicolinc@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe<jgg@xxxxxxxxxx>
---
  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: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Best regards,
baolu



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