6.12-stable review patch. If anyone has any objections, please let me know.
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From: Jason Gunthorpe jgg@nvidia.com
[ Upstream commit cb83f4b965a66d85e9a03621ef3b22c044f4a033 ]
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@tecnico.ulisboa.pt Closes: https://lore.kernel.org/all/c6a6f114-3acd-4d56-a13b-b88978e927dc@tecnico.uli... 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_i... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/host1x/dev.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index 710674ef40a97..3f23a7d91519f 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -367,6 +367,10 @@ 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); @@ -391,6 +395,8 @@ 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;