Messages in this thread | | | Date | Wed, 10 Feb 2010 15:10:38 -0800 | From | Abhijeet Dharmapurikar <> | Subject | Re: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer |
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Russell King - ARM Linux wrote: > On Wed, Feb 10, 2010 at 01:27:47PM -0800, Randy Dunlap wrote: >> On 02/10/10 12:37, adharmap@codeaurora.org wrote: >>> From: Abhijeet Dharmapurikar <adharmap@quicinc.com> >>> >>> Please refer to the post here >>> http://lkml.org/lkml/2010/1/4/347 >>> >>> These changes are to introduce barrierless dma_map_area and dma_unmap_area and >>> use them to map the buffers in the scatterlist. For the last buffer, call >>> the normal dma_map_area(aka with barriers) effectively executing the barrier >>> at the end of the operation. >>> >>> Note that the barrierless operations are implemented for few arm >>> architectures only and I would implement for others once these are okayed by the >>> community. >> So when you add these interfaces for other architectures, you will also >> update Documentation/DMA-API.txt, right?? > > Do we need barrier-less interfaces for anything other than the dma_*_sg > functions?
I think, dma_*_sg are the only ones that could benefit from barrier-less interfaces.
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