[PATCH v4 15/19] iommu/s390: Add set_platform_dma_ops callback

[Lu Baolu <baolu.lu@linux.intel.com>]

This IOMMU driver doesn't support default domain. Add the implementation
of set_platform_dma_ops callback so that the IOMMU core could return the
DMA control. With the set_platform_dma implemented, there's no need for
detach_dev. Remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/s390-iommu.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index ed33c6cce083..5591dab99446 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -144,13 +144,10 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
 	return 0;
 }
 
-static void s390_iommu_detach_device(struct iommu_domain *domain,
-				     struct device *dev)
+static void s390_iommu_set_platform_dma(struct device *dev)
 {
 	struct zpci_dev *zdev = to_zpci_dev(dev);
 
-	WARN_ON(zdev->s390_domain != to_s390_domain(domain));
-
 	__s390_iommu_detach_device(zdev);
 	zpci_dma_init_device(zdev);
 }
@@ -435,11 +432,11 @@ 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_ops = 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) {
 		.attach_dev	= s390_iommu_attach_device,
-		.detach_dev	= s390_iommu_detach_device,
 		.map_pages	= s390_iommu_map_pages,
 		.unmap_pages	= s390_iommu_unmap_pages,
 		.flush_iotlb_all = s390_iommu_flush_iotlb_all,
-- 
2.34.1