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Date: Thu, 09 Sep 2010 10:10:00 -0700
From: David Daney <ddaney@...iumnetworks.com>
To: Kevin Cernekee <cernekee@...il.com>
CC: Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
linux-kernel@...r.kernel.org
Subject: Re: [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@...il.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
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