iommu/amd: Use swiotlb in passthrough mode

In passthrough mode (iommu=pt) all devices are identity
mapped. If a device does not support 64bit DMA it might
still need remapping. Make sure swiotlb is initialized to
provide this remapping.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 6d3dae962867..e29baa6c64e3 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2282,12 +2282,10 @@ static int amd_iommu_add_device(struct device *dev)
 
         /* Domains are initialized for this device - have a look what we ended up with */
         domain = iommu_get_domain_for_dev(dev);
-        if (domain->type == IOMMU_DOMAIN_IDENTITY) {
+        if (domain->type == IOMMU_DOMAIN_IDENTITY)
                 dev_data->passthrough = true;
-                dev->archdata.dma_ops = &nommu_dma_ops;
-        } else {
+        else
                 dev->archdata.dma_ops = &amd_iommu_dma_ops;
-        }
 
 out:
         iommu_completion_wait(iommu);
@@ -2852,8 +2850,8 @@ int __init amd_iommu_init_api(void)
 
 int __init amd_iommu_init_dma_ops(void)
 {
+        swiotlb        = iommu_pass_through ? 1 : 0;
         iommu_detected = 1;
-        swiotlb = 0;
 
         amd_iommu_stats_init();