Messages in this thread | | | From | adharmap@codeauro ... | Subject | [RFC 0/2] fix dma_map_sg not to do barriers for each buffer | Date | Wed, 10 Feb 2010 12:37:28 -0800 |
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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.
Abhijeet Dharmapurikar (2): dma: define barrierless versions of map and unmap area dma: fix scatter-gather api to use barrierless map/unmap functions
arch/arm/include/asm/cacheflush.h | 9 +++ arch/arm/include/asm/dma-mapping.h | 82 +++++++++++++++++++++ arch/arm/mm/cache-v3.S | 6 ++ arch/arm/mm/cache-v4.S | 6 ++ arch/arm/mm/cache-v4wb.S | 94 +++++++++++++++++------- arch/arm/mm/cache-v4wt.S | 6 ++ arch/arm/mm/cache-v6.S | 139 +++++++++++++++++++++++++---------- arch/arm/mm/cache-v7.S | 120 +++++++++++++++++++++++-------- arch/arm/mm/dma-mapping.c | 55 +++++++++++++-- 9 files changed, 414 insertions(+), 103 deletions(-)
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