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powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask

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This patch adds the ability to the DMA direct ops to fallback to the IOMMU
ops for coherent alloc/free if the coherent mask of the device isn't
suitable for accessing the direct DMA space and the device also happens
to have an active IOMMU table.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt
2015-06-24 15:25:31 +10:00
committed by Michael Ellerman
parent e91c25111a
commit 817820b022
5 changed files with 105 additions and 26 deletions
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4
arch/powerpc/kernel/dma-swiotlb.c
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@@ -47,8 +47,8 @@ static u64 swiotlb_powerpc_get_required(struct device *dev)
* for everything else.
*/
struct dma_map_ops swiotlb_dma_ops = {
.alloc = dma_direct_alloc_coherent,
.free = dma_direct_free_coherent,
.alloc = __dma_direct_alloc_coherent,
.free = __dma_direct_free_coherent,
.mmap = dma_direct_mmap_coherent,
.map_sg = swiotlb_map_sg_attrs,
.unmap_sg = swiotlb_unmap_sg_attrs,