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swiotlb: remove swiotlb_dma_supported

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The only user left is powerpc, but even there the generic dma-direct
version works just as well, given that we guarantee that the swiotlb
buffer must always be addressable.

Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: Christian Zigotzky <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-02-13 08:01:27 +01:00 • committed by Michael Ellerman
commit feee96440c
3 changed files with 1 additions and 16 deletions
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12
kernel/dma/swiotlb.c
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@ -648,15 +648,3 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
return true;
}
/*
* Return whether the given device DMA address mask can be supported
* properly. For example, if your device can only drive the low 24-bits
* during bus mastering, then you would pass 0x00ffffff as the mask to
* this function.
*/
int
swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
}