From: Jason Gunthorpe Date: Wed, 13 Sep 2023 13:43:45 +0000 (-0300) Subject: iommu/tegra-smmu: Support DMA domains in tegra X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f128094f347f578279e551488796d0a0067cbdff;p=linux.git iommu/tegra-smmu: Support DMA domains in tegra All ARM64 iommu drivers should support IOMMU_DOMAIN_DMA to enable dma-iommu.c. tegra is blocking dma-iommu usage, and also default_domain's, because it wants an identity translation. This is needed for some device quirk. The correct way to do this is to support IDENTITY domains and use ops->def_domain_type() to return IOMMU_DOMAIN_IDENTITY for only the quirky devices. Add support for IOMMU_DOMAIN_DMA and force IOMMU_DOMAIN_IDENTITY mode for everything so no behavior changes. Reviewed-by: Jerry Snitselaar Signed-off-by: Jason Gunthorpe Link: https://lore.kernel.org/r/12-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 80481e1ba561b..b91ad1b5a20d3 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -276,7 +276,7 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type) { struct tegra_smmu_as *as; - if (type != IOMMU_DOMAIN_UNMANAGED) + if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) return NULL; as = kzalloc(sizeof(*as), GFP_KERNEL);