[PATCH v3 15/20] iommu/s390: Add set_platform_dma callback

[Lu Baolu]

This IOMMU driver doesn't support default domain. Add the implementation
of set_platform_dma callback so that the IOMMU core could return the
DMA control.

Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/iommu/s390-iommu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index ed33c6cce083..507bbc2c9b58 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -179,6 +179,14 @@ static void s390_iommu_get_resv_regions(struct device *dev,
 	}
 }
 
+static void s390_iommu_set_platform_dma(struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+
+	if (domain)
+		s390_iommu_detach_device(domain, dev);
+}
+
 static struct iommu_device *s390_iommu_probe_device(struct device *dev)
 {
 	struct zpci_dev *zdev;
@@ -435,6 +443,7 @@ static const struct iommu_ops s390_iommu_ops = {
 	.probe_device = s390_iommu_probe_device,
 	.release_device = s390_iommu_release_device,
 	.device_group = generic_device_group,
+	.set_platform_dma = s390_iommu_set_platform_dma,
 	.pgsize_bitmap = SZ_4K,
 	.get_resv_regions = s390_iommu_get_resv_regions,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-- 
2.34.1