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dma-direct: add an explicit dma_direct_get_required_mask

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This is somewhat modelled after the powerpc version, and differs from
the legacy fallback in use fls64 instead of pointlessly splitting up the
address into low and high dwords and in that it takes (__)phys_to_dma
into account.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig
2018-09-20 13:26:13 +02:00
parent c6d4381220
commit a20bb05837
2 changed files with 20 additions and 3 deletions
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include/linux/dma-direct.h
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@@ -55,6 +55,7 @@ static inline void dma_mark_clean(void *addr, size_t size)
}
#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
u64 dma_direct_get_required_mask(struct device *dev);
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,