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authorRobin Murphy <robin.murphy@arm.com>2017-02-01 20:53:04 +0300
committerJoerg Roedel <jroedel@suse.de>2017-02-06 15:14:10 +0300
commita1831bb9403720db6d4c033fe2d6bd0116dd28fe (patch)
tree2a2267ebdab46668c8e7063bdaef54336e67d6e5 /include/linux/dma-iommu.h
parent122fac030e912ed723fe94d8eb0d5d0f6b31535e (diff)
downloadlinux-a1831bb9403720db6d4c033fe2d6bd0116dd28fe.tar.xz
iommu/dma: Remove bogus dma_supported() implementation
Back when this was first written, dma_supported() was somewhat of a murky mess, with subtly different interpretations being relied upon in various places. The "does device X support DMA to address range Y?" uses assuming Y to be physical addresses, which motivated the current iommu_dma_supported() implementation and are alluded to in the comment therein, have since been cleaned up, leaving only the far less ambiguous "can device X drive address bits Y" usage internal to DMA API mask setting. As such, there is no reason to keep a slightly misleading callback which does nothing but duplicate the current default behaviour; we already constrain IOVA allocations to the iommu_domain aperture where necessary, so let's leave DMA mask business to architecture-specific code where it belongs. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/dma-iommu.h')
-rw-r--r--include/linux/dma-iommu.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 3a846f9ec0fd..5725c94b1f12 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -67,7 +67,6 @@ dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
size_t size, enum dma_data_direction dir, unsigned long attrs);
void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs);
-int iommu_dma_supported(struct device *dev, u64 mask);
int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
/* The DMA API isn't _quite_ the whole story, though... */