From mboxrd@z Thu Jan 1 00:00:00 1970 From: adharmap@codeaurora.org (adharmap at codeaurora.org) Date: Wed, 10 Feb 2010 12:37:28 -0800 Subject: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer Message-ID: <1265834250-29170-1-git-send-email-adharmap@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Abhijeet Dharmapurikar 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(-)