iommu/vt-d: Return the correct dma mask when we are bypassing the IOMMU

We must return a mask covering the full physical RAM when bypassing the
IOMMU mapping. Also, in iommu_need_mapping, we need to check using
dma_direct_get_required_mask to ensure that the device's dma_mask can
cover physical RAM before deciding to bypass IOMMU mapping.

Based on an earlier patch from Christoph Hellwig.

Fixes: 249baa547901 ("dma-mapping: provide a better default ->get_required_mask")
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 3f974919d3bd..79e35b3180ac 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3471,7 +3471,7 @@ static bool iommu_need_mapping(struct device *dev)
                 if (dev->coherent_dma_mask && dev->coherent_dma_mask < dma_mask)
                         dma_mask = dev->coherent_dma_mask;
 
-                if (dma_mask >= dma_get_required_mask(dev))
+                if (dma_mask >= dma_direct_get_required_mask(dev))
                         return false;
 
                 /*
@@ -3775,6 +3775,13 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
         return nelems;
 }
 
+static u64 intel_get_required_mask(struct device *dev)
+{
+        if (!iommu_need_mapping(dev))
+                return dma_direct_get_required_mask(dev);
+        return DMA_BIT_MASK(32);
+}
+
 static const struct dma_map_ops intel_dma_ops = {
         .alloc = intel_alloc_coherent,
         .free = intel_free_coherent,
@@ -3787,6 +3794,7 @@ static const struct dma_map_ops intel_dma_ops = {
         .dma_supported = dma_direct_supported,
         .mmap = dma_common_mmap,
         .get_sgtable = dma_common_get_sgtable,
+        .get_required_mask = intel_get_required_mask,
 };
 
 static void