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Subject[PATCH 2/5] intel-iommu: Use dma_generic_alloc_coherent() for passthrough mappings
Date
intel_alloc_coherent() needs to follow DMA mapping convention and
make use of the coherent_dma_mask of the device. Without this,
devices may get buffers they can't use.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
---
drivers/pci/intel-iommu.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index b1e97e6..40be49a 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2765,6 +2765,10 @@ static void *intel_alloc_coherent(struct device *hwdev, size_t size,
void *vaddr;
int order;

+ if (iommu_no_mapping(hwdev))
+ return dma_generic_alloc_coherent(hwdev, size, dma_handle,
+ flags);
+
size = PAGE_ALIGN(size);
order = get_order(size);
flags &= ~(GFP_DMA | GFP_DMA32);
@@ -2788,6 +2792,10 @@ static void intel_free_coherent(struct device *hwdev, size_t size, void *vaddr,
{
int order;

+ if (iommu_no_mapping(hwdev))
+ return dma_generic_free_coherent(hwdev, size, vaddr,
+ dma_handle);
+
size = PAGE_ALIGN(size);
order = get_order(size);



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