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gpu: host1x: 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_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 fae6e669cd ("drm/tegra: Do not assume that a NULL domain means no
DMA IOMMU").

Fixes: c8cc2655cc ("iommu/tegra-smmu: Implement an IDENTITY domain")
Reported-by: Diogo Ivo <diogo.ivo@tecnico.ulisboa.pt>
Closes: https://lore.kernel.org/all/c6a6f114-3acd-4d56-a13b-b88978e927dc@tecnico.ulisboa.pt/
Tested-by: Diogo Ivo <diogo.ivo@tecnico.ulisboa.pt>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/0-v1-10dcc8ce3869+3a7-host1x_identity_jgg@nvidia.com
This commit is contained in:
Jason Gunthorpe 2025-02-04 15:18:19 -04:00 committed by Thierry Reding
parent 67d15c7aa0
commit cb83f4b965
1 changed files with 6 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/gpu/host1x/dev.c
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@ -361,6 +361,10 @@ static bool host1x_wants_iommu(struct host1x *host1x)
return true;
}
/*
* Returns ERR_PTR on failure, NULL if the translation is IDENTITY, otherwise a
* valid paging domain.
*/
static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev);
@ -385,6 +389,8 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
* Similarly, if host1x is already attached to an IOMMU (via the DMA
* API), don't try to attach again.
*/
if (domain && domain->type == IOMMU_DOMAIN_IDENTITY)
domain = NULL;
if (!host1x_wants_iommu(host) || domain)
return domain;