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dma-mapping: add a dma_addressing_limited helper
This helper returns if the device has issues addressing all present memory in the system. Signed-off-by: Christoph Hellwig <hch@lst.de>
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1 changed files with 14 additions and 0 deletions
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@ -679,6 +679,20 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
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return dma_set_mask_and_coherent(dev, mask);
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}
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/**
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* dma_addressing_limited - return if the device is addressing limited
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* @dev: device to check
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*
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* Return %true if the devices DMA mask is too small to address all memory in
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* the system, else %false. Lack of addressing bits is the prime reason for
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* bounce buffering, but might not be the only one.
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*/
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static inline bool dma_addressing_limited(struct device *dev)
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{
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return min_not_zero(*dev->dma_mask, dev->bus_dma_mask) <
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dma_get_required_mask(dev);
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}
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#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
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void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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const struct iommu_ops *iommu, bool coherent);
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