From c8cc2655cc6c7ff832827ad5bc1a8f3df165706d Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Wed, 13 Sep 2023 10:43:44 -0300 Subject: [PATCH] iommu/tegra-smmu: Implement an IDENTITY domain What tegra-smmu does during tegra_smmu_set_platform_dma() is actually putting the iommu into identity mode. Move to the new core support for ARM_DMA_USE_IOMMU by defining ops->identity_domain. Reviewed-by: Lu Baolu Reviewed-by: Jerry Snitselaar Signed-off-by: Jason Gunthorpe Link: https://lore.kernel.org/r/11-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com Signed-off-by: Joerg Roedel --- drivers/iommu/tegra-smmu.c | 37 ++++++++++++++++++++++++++++++++----- 1 file changed, 32 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index e445f80d0226..80481e1ba561 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -511,23 +511,39 @@ disable: return err; } -static void tegra_smmu_set_platform_dma(struct device *dev) +static int tegra_smmu_identity_attach(struct iommu_domain *identity_domain, + struct device *dev) { struct iommu_domain *domain = iommu_get_domain_for_dev(dev); struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - struct tegra_smmu_as *as = to_smmu_as(domain); - struct tegra_smmu *smmu = as->smmu; + struct tegra_smmu_as *as; + struct tegra_smmu *smmu; unsigned int index; if (!fwspec) - return; + return -ENODEV; + if (domain == identity_domain || !domain) + return 0; + + as = to_smmu_as(domain); + smmu = as->smmu; for (index = 0; index < fwspec->num_ids; index++) { tegra_smmu_disable(smmu, fwspec->ids[index], as->id); tegra_smmu_as_unprepare(smmu, as); } + return 0; } +static struct iommu_domain_ops tegra_smmu_identity_ops = { + .attach_dev = tegra_smmu_identity_attach, +}; + +static struct iommu_domain tegra_smmu_identity_domain = { + .type = IOMMU_DOMAIN_IDENTITY, + .ops = &tegra_smmu_identity_ops, +}; + static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova, u32 value) { @@ -962,11 +978,22 @@ static int tegra_smmu_of_xlate(struct device *dev, return iommu_fwspec_add_ids(dev, &id, 1); } +static int tegra_smmu_def_domain_type(struct device *dev) +{ + /* + * FIXME: For now we want to run all translation in IDENTITY mode, due + * to some device quirks. Better would be to just quirk the troubled + * devices. + */ + return IOMMU_DOMAIN_IDENTITY; +} + static const struct iommu_ops tegra_smmu_ops = { + .identity_domain = &tegra_smmu_identity_domain, + .def_domain_type = &tegra_smmu_def_domain_type, .domain_alloc = tegra_smmu_domain_alloc, .probe_device = tegra_smmu_probe_device, .device_group = tegra_smmu_device_group, - .set_platform_dma_ops = tegra_smmu_set_platform_dma, .of_xlate = tegra_smmu_of_xlate, .pgsize_bitmap = SZ_4K, .default_domain_ops = &(const struct iommu_domain_ops) {