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SubjectRe: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer
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??


> 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(-)


--
~Randy


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