iommu/arm-smmu: Add getter for DOMAIN_ATTR_SECURE_VMID

It can be useful to query a previously set secure VMID.  Add a domain
attribute getter for this.

Change-Id: Iaf14201d321161ce4ccc69b674a3b1247d6a7e94
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 11468a8..38e95fe 100644 (file)
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -2278,6 +2278,10 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
                                (1 << DOMAIN_ATTR_COHERENT_HTW_DISABLE));
                ret = 0;
                break;
+       case DOMAIN_ATTR_SECURE_VMID:
+               *((int *)data) = smmu_domain->secure_vmid;
+               ret = 0;
+               break;
        case DOMAIN_ATTR_PT_BASE_ADDR:
                *((phys_addr_t *)data) =
                        smmu_domain->pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0];