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| author | Robin Murphy <robin.murphy@arm.com> | 2017-02-01 20:53:04 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-02-06 15:14:10 +0300 |
| commit | a1831bb9403720db6d4c033fe2d6bd0116dd28fe (patch) | |
| tree | 2a2267ebdab46668c8e7063bdaef54336e67d6e5 /drivers/iommu | |
| parent | 122fac030e912ed723fe94d8eb0d5d0f6b31535e (diff) | |
| download | linux-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 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 1c9ac26e3b68..48d36ce59efb 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -734,16 +734,6 @@ void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, __iommu_dma_unmap(iommu_get_domain_for_dev(dev), handle); } -int iommu_dma_supported(struct device *dev, u64 mask) -{ - /* - * 'Special' IOMMUs which don't have the same addressing capability - * as the CPU will have to wait until we have some way to query that - * before they'll be able to use this framework. - */ - return 1; -} - int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { return dma_addr == DMA_ERROR_CODE; |