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drm/tegra: Do not assume that a NULL domain means no DMA IOMMU

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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_client_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.

Fixes: c8cc2655cc ("iommu/tegra-smmu: Implement an IDENTITY domain")
Reported-by: diogo.ivo@tecnico.ulisboa.pt
Closes: https://lore.kernel.org/all/bbmhcoghrprmbdibnjum6lefix2eoquxrde7wyqeulm4xabmlm@b6jy32saugqh/
Tested-by: diogo.ivo@tecnico.ulisboa.pt
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/0-v1-3049f92c4812+16691-host1x_def_dom_fix_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2024-01-30 12:14:54 -04:00 committed by Joerg Roedel
parent 83b3836bf8
commit fae6e669cd
1 changed files with 2 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/gpu/drm/tegra/drm.c
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@ -960,7 +960,8 @@ int host1x_client_iommu_attach(struct host1x_client *client)
* not the shared IOMMU domain, don't try to attach it to a different
* domain. This allows using the IOMMU-backed DMA API.
*/
if (domain && domain != tegra->domain)
if (domain && domain->type != IOMMU_DOMAIN_IDENTITY &&
domain != tegra->domain)
return 0;
if (tegra->domain) {