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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 <baolu.lu@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/11-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2023-09-13 10:43:44 -03:00 committed by Joerg Roedel
parent b3d14960e6
commit c8cc2655cc
1 changed files with 32 additions and 5 deletions
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37
drivers/iommu/tegra-smmu.c
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@ -511,23 +511,39 @@ disable:
return err; 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_domain *domain = iommu_get_domain_for_dev(dev);
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct tegra_smmu_as *as = to_smmu_as(domain); struct tegra_smmu_as *as;
struct tegra_smmu *smmu = as->smmu; struct tegra_smmu *smmu;
unsigned int index; unsigned int index;
if (!fwspec) 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++) { for (index = 0; index < fwspec->num_ids; index++) {
tegra_smmu_disable(smmu, fwspec->ids[index], as->id); tegra_smmu_disable(smmu, fwspec->ids[index], as->id);
tegra_smmu_as_unprepare(smmu, as); 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, static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova,
u32 value) u32 value)
{ {
@ -962,11 +978,22 @@ static int tegra_smmu_of_xlate(struct device *dev,
return iommu_fwspec_add_ids(dev, &id, 1); 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 = { 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, .domain_alloc = tegra_smmu_domain_alloc,
.probe_device = tegra_smmu_probe_device, .probe_device = tegra_smmu_probe_device,
.device_group = tegra_smmu_device_group, .device_group = tegra_smmu_device_group,
.set_platform_dma_ops = tegra_smmu_set_platform_dma,
.of_xlate = tegra_smmu_of_xlate, .of_xlate = tegra_smmu_of_xlate,
.pgsize_bitmap = SZ_4K, .pgsize_bitmap = SZ_4K,
.default_domain_ops = &(const struct iommu_domain_ops) { .default_domain_ops = &(const struct iommu_domain_ops) {