iommu/arm-smmu: add support for DOMAIN_ATTR_CONTEXT_BANK



Because the ARM SMMU driver assigns context banks dynamically,
some drivers need a way to know which one they are using.

Change-Id: Ic0dedbad4327ef86c5a893a48b57f0f9417800e9
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>

parent 8d240a02

drivers/iommu/arm-smmu.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -1905,6 +1905,14 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
		smmu_domain->pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0];
		ret = 0;
		break;
		case DOMAIN_ATTR_CONTEXT_BANK:
		/* context bank index isn't valid until we are attached */
		if (smmu_domain->smmu == NULL)
		return -ENODEV;

		((unsigned int ) data) = smmu_domain->cfg.cbndx;
		ret = 0;
		break;
		default:
		ret = -ENODEV;
		break;