linux-kernel - [PATCH] iommu/vt-d: Return the correct dma mask when we are bypassing the IOMMU

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Message-ID: <20191008143357.GA599223@rani.riverdale.lan>
Date:   Tue, 8 Oct 2019 10:33:57 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     linux-kernel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>
Subject: [PATCH] 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.

Fixes: 249baa547901 ("dma-mapping: provide a better default ->get_required_mask")
Reported-by: Arvind Sankar <nivedita@...m.mit.edu>
Tested-by: Arvind Sankar <nivedita@...m.mit.edu>
Originally-by: Christoph Hellwig <hch@....de>
Signed-off-by: Christoph Hellwig <hch@....de>
Fixed-by: Arvind Sankar <nivedita@...m.mit.edu>
Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
---
 drivers/iommu/intel-iommu.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

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
-- 
2.21.0