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powerpc/dma: untangle vio_dma_mapping_ops from dma_iommu_ops

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vio_dma_mapping_ops currently does a lot of indirect calls through
dma_iommu_ops, which not only make the code harder to follow but are
also expensive in the post-spectre world.  Unwind the indirect calls
by calling the ppc_iommu_* or iommu_* APIs directly applicable, or
just use the dma_iommu_* methods directly where we can.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig
2019-02-13 08:01:04 +01:00
committed by Michael Ellerman
parent fbce251baa
commit a20f507f57
3 changed files with 38 additions and 52 deletions
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arch/powerpc/kernel/dma-iommu.c
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@@ -92,7 +92,7 @@ int dma_iommu_dma_supported(struct device *dev, u64 mask)
return 1;
}
static u64 dma_iommu_get_required_mask(struct device *dev)
u64 dma_iommu_get_required_mask(struct device *dev)
{
struct iommu_table *tbl = get_iommu_table_base(dev);
u64 mask;