[PATCHv2 3/6] iommu/arm-smmu: Implement iommu_ops->def_domain_type call-back

Sai Prakash Ranjan
2020-04-20T14:38:22Z

Implement the new def_domain_type call-back for the ARM
SMMU driver. We need this to support requesting the domain
type by the client devices.

Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
---
drivers/iommu/arm-smmu.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index e622f4e33379..b5d1d52dfbb8 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1609,6 +1609,25 @@ static void arm_smmu_get_resv_regions(struct device *dev,
iommu_dma_get_resv_regions(dev, head);
}

+static int arm_smmu_def_domain_type(struct device *dev)
+{
+ struct iommu_fwspec *fwspec;
+ struct arm_smmu_device *smmu;
+
+ fwspec = dev_iommu_fwspec_get(dev);
+ if (!fwspec || fwspec->ops != &arm_smmu_ops)
+ return -ENODEV;
+
+ smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
+ if (!smmu)
+ return -ENODEV;
+
+ if (smmu->impl && smmu->impl->req_domain)
+ return smmu->impl->req_domain(dev);
+
+ return 0;
+}
+
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@@ -1627,6 +1646,7 @@ static struct iommu_ops arm_smmu_ops = {
.of_xlate = arm_smmu_of_xlate,
.get_resv_regions = arm_smmu_get_resv_regions,
.put_resv_regions = generic_iommu_put_resv_regions,
+ .def_domain_type = arm_smmu_def_domain_type,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};