Hello again,
On 2/4/25 7:18 PM, Jason Gunthorpe wrote:
Previously with tegra-smmu, even with CONFIG_IOMMU_DMA, the default domain
could have been left as NULL. The NULL domain is specially recognized by
host1x_iommu_attach() as meaning it is not the DMA domain and
should be replaced with the special shared domain.
This happened prior to the below commit because tegra-smmu was using the
NULL domain to mean IDENTITY.
Now that the domain is properly labled the test in DRM doesn't see NULL.
Check for IDENTITY as well to enable the special domains.
This is the same issue and basic fix as seen in
commit fae6e669cdc5 ("drm/tegra: Do not assume that a NULL domain means no
DMA IOMMU").
Fixes: c8cc2655cc6c ("iommu/tegra-smmu: Implement an IDENTITY domain")
Reported-by: Diogo Ivo <diogo.ivo@xxxxxxxxxxxxxxxxxx>
Closes: https://lore.kernel.org/all/c6a6f114-3acd-4d56-a13b-b88978e927dc@xxxxxxxxxxxxxxxxxx/
Tested-by: Diogo Ivo <diogo.ivo@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Any news on this patch or any other solutions for this regression? It's
not great if this falls through the cracks, especially when there is a
solution for the problem.
Thanks,
Diogo
