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iommu/arm-smmu: implement DOMAIN_ATTR_PT_BASE_ADDR using ttbr[0]

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Some clients need to get the base address of the page table for a given
IOMMU domain.  This functionality is provided by the
DOMAIN_ATTR_PT_BASE_ADDR domain attribute.  Implement it in the ARM SMMU
driver by returning ttbr[0] from the page table config.

Change-Id: Ie9b0241c7c7df18b25761bae79c1be1a283ff3a4
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2014-11-12 15:11:33 -08:00 • committed by David Keitel
parent 7bd641abae
commit c3c7ce2a6d
1 changed files with 4 additions and 0 deletions
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4
drivers/iommu/arm-smmu.c
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@ -1684,6 +1684,10 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
*((int *)data) = !!(smmu_domain->attributes & *((int *)data) = !!(smmu_domain->attributes &
(1 << DOMAIN_ATTR_COHERENT_HTW_DISABLE)); (1 << DOMAIN_ATTR_COHERENT_HTW_DISABLE));
return 0; return 0;
case DOMAIN_ATTR_PT_BASE_ADDR:
*((phys_addr_t *)data) =
smmu_domain->pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0];
return 0;
default: default:
return -ENODEV; return -ENODEV;
} }