diff options
author | Christoph Hellwig <hch@lst.de> | 2019-07-16 21:59:11 +0200 |
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committer | Christoph Hellwig <hch@lst.de> | 2019-07-17 08:25:40 +0200 |
commit | b866455423e040813f113d8b87e8297778ee2014 (patch) | |
tree | aa579e45a03d123e8813eaf8bfe78485b2d55549 /include | |
parent | 9087c37584fb7d8315877bb55f85e4268cc0b4f4 (diff) | |
download | linux-b866455423e040813f113d8b87e8297778ee2014.tar.bz2 |
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>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/dma-mapping.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 8d13e28a8e07..e11b115dd0e4 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -679,6 +679,20 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) return dma_set_mask_and_coherent(dev, mask); } +/** + * dma_addressing_limited - return if the device is addressing limited + * @dev: device to check + * + * Return %true if the devices DMA mask is too small to address all memory in + * the system, else %false. Lack of addressing bits is the prime reason for + * bounce buffering, but might not be the only one. + */ +static inline bool dma_addressing_limited(struct device *dev) +{ + return min_not_zero(*dev->dma_mask, dev->bus_dma_mask) < + dma_get_required_mask(dev); +} + #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, const struct iommu_ops *iommu, bool coherent); |