gpu: host1x: Do not assume that a NULL domain means no DMA IOMMU

JIRA: https://issues.redhat.com/browse/RHEL-116573

Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit cb83f4b
Author: Jason Gunthorpe <jgg@ziepe.ca>
Date:   Tue Feb 4 15:18:19 2025 -0400

    gpu: host1x: Do not assume that a NULL domain means no DMA IOMMU

    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 fae6e66 ("drm/tegra: Do not assume that a NULL domain means no
    DMA IOMMU").

    Fixes: c8cc265 ("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

Signed-off-by: Eder Zulian <ezulian@redhat.com>

Author: efzrh

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;