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Commit 7e47f9bc authored by Jeremy Gebben's avatar Jeremy Gebben Committed by Patrick Daly
Browse files

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: default avatarJordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: default avatarJeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent e352bb02

drivers/iommu/arm-smmu.c

+10 −0
Original line number Diff line number Diff line
@@ -1705,6 +1705,7 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, 
				    enum iommu_attr attr, void *data)

{

	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);

	int ret = 0;



	switch (attr) {

	case DOMAIN_ATTR_NESTING:
@@ -1714,9 +1715,18 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, 
		*((phys_addr_t *)data) =

			smmu_domain->pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0];

		return 0;

	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:

		return -ENODEV;

	}

	return ret;

}



static int arm_smmu_domain_set_attr(struct iommu_domain *domain,