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

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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: 249baa5479 ("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>

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Arvind Sankar 2019-10-08 10:33:57 -04:00 • committed by Christoph Hellwig

parent 0e2adab6cf

commit 9c24eaf81c

1 changed files with 9 additions and 1 deletions

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drivers/iommu/intel-iommu.c

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