15 Oct
2012
15 Oct
'12
2:03 p.m.
Hello,
Some devices, which have IOMMU, for some use cases might require to allocate a buffers for DMA which is contiguous in physical memory. Such use cases appears for example in DRM subsystem when one wants to improve performance or use secure buffer protection.
I would like to ask if adding a new attribute, as proposed in this RFC is a good idea? I feel that it might be an attribute just for a single driver, but I would like to know your opinion. Should we look for other solution?
Best regards
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Marek Szyprowski
Samsung Poland R&D Center
Marek Szyprowski (2):
common: DMA-mapping: add DMA_ATTR_FORCE_CONTIGUOUS attribute
ARM: dma-mapping: add support for DMA_ATTR_FORCE_CONTIGUOUS attribute
Documentation/DMA-attributes.txt | 9 +++++++++
arch/arm/mm/dma-mapping.c | 41 ++++++++++++++++++++++++++++++--------
include/linux/dma-attrs.h | 1 +
3 files changed, 43 insertions(+), 8 deletions(-)
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1.7.9.5