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Commit 3a8f7558 authored by Milton Miller's avatar Milton Miller Committed by Benjamin Herrenschmidt
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dma-mapping: Add get_required_mask if arch overrides default 



If an architecture sets ARCH_HAS_DMA_GET_REQUIRED_MASK and has settable
dma_map_ops, the required mask may change by the ops implementation.
For example, a system that always has an mmu inline may only require 32
bits while a swiotlb would desire bits to cover all of memory.

Therefore add the field if the architecture does not use the generic
definition of dma_get_required_mask. The first use will by by powerpc.
Note that this does add some dependency on the order in which files are
visible here.

Signed-off-by: default avatarMilton Miller <miltonm@bga.com>
Signed-off-by: default avatarNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
parent 6a5c7be5

include/linux/dma-mapping.h

+3 −0
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ struct dma_map_ops { 
	int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);

	int (*dma_supported)(struct device *dev, u64 mask);

	int (*set_dma_mask)(struct device *dev, u64 mask);

#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK

	u64 (*get_required_mask)(struct device *dev);

#endif

	int is_phys;

};