iommu/arm-smmu: Implement DOMAIN_ATTR_PGTBL_INFO



The DOMAIN_ATTR_PGTBL_INFO attribute will be useful in implementing DMA
APIs that can leverage the fast page table mapping routines.  Implement
it.

CRs-Fixed: 997751
Change-Id: Id3acec0089b126e7d6ad44d8d322bf473614f716
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

parent 632ca00a

drivers/iommu/arm-smmu.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -2901,6 +2901,17 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
		& (1 << DOMAIN_ATTR_FAST));
		ret = 0;
		break;
		case DOMAIN_ATTR_PGTBL_INFO: {
		struct iommu_pgtbl_info *info = data;

		if (!(smmu_domain->attributes & (1 << DOMAIN_ATTR_FAST))) {
		ret = -ENODEV;
		break;
		}
		info->pmds = smmu_domain->pgtbl_cfg.av8l_fast_cfg.pmds;
		ret = 0;
		break;
		}
		default:
		ret = -ENODEV;
		break;