lkml.org 
[lkml]   [2010]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3] MIPS: DMA: Add plat_extra_sync_for_cpu()
On 09/08/2010 04:02 PM, Kevin Cernekee wrote:
> On noncoherent processors with a readahead cache, an extra platform-
> specific invalidation is required during the dma_sync_*_for_cpu()
> operations to keep drivers from seeing stale prefetched data.
>
> Signed-off-by: Kevin Cernekee<cernekee@gmail.com>
> ---
> .../include/asm/mach-cavium-octeon/dma-coherence.h | 13 +++++++++++++
> arch/mips/include/asm/mach-generic/dma-coherence.h | 13 +++++++++++++
> arch/mips/include/asm/mach-ip27/dma-coherence.h | 13 +++++++++++++
> arch/mips/include/asm/mach-ip32/dma-coherence.h | 13 +++++++++++++
> arch/mips/include/asm/mach-jazz/dma-coherence.h | 13 +++++++++++++
> .../mips/include/asm/mach-loongson/dma-coherence.h | 13 +++++++++++++
> arch/mips/include/asm/mach-powertv/dma-coherence.h | 13 +++++++++++++
> arch/mips/mm/dma-default.c | 3 +++
> 8 files changed, 94 insertions(+), 0 deletions(-)
>
[...]

But as far as I can see, none of your plat_extra_sync_for_cpu() do anything.

Perhaps adding this hook should be deferred until there is actually a user.

David Daney


\
 
 \ /
  Last update: 2010-09-09 19:13    [W:0.094 / U:1.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site