Commit 3a8f7558 authored by Milton Miller's avatar Milton Miller Committed by Benjamin Herrenschmidt

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 <>
Signed-off-by: default avatarNishanth Aravamudan <>
Signed-off-by: default avatarBenjamin Herrenschmidt <>
Acked-by: default avatarFUJITA Tomonori <>
parent 6a5c7be5
......@@ -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);
u64 (*get_required_mask)(struct device *dev);
int is_phys;
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