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SubjectRe: [PATCH v4 04/11] swiotlb: support NOT_COHERENT_CACHE PowerPC platforms
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On Fri, 12 Mar 2010 20:12:39 +0100
Albert Herranz <albert_herranz@yahoo.es> wrote:

> The current SWIOTLB code does not support NOT_COHERENT_CACHE platforms.
> This patch adds support for NOT_COHERENT_CACHE platforms to SWIOTLB by
> adding two platform specific functions swiotlb_dma_sync_page() and
> swiotlb_dma_sync() which can be used to explicitly manage cache coherency.
>
> On PowerPC these functions are mapped to their corresponding
> __dma_sync_page() and __dma_sync() functions.
> On other architectures using SWIOTLB these functions are optimized out.
>
> This will be used later to support SWIOTLB on the Nintendo Wii video game
> console.
>
> CC: linuxppc-dev@lists.ozlabs.org
> CC: linux-kernel@vger.kernel.org
> CC: x86@kernel.org
> CC: linux-ia64@vger.kernel.org
> Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
> ---
> arch/ia64/include/asm/swiotlb.h | 10 ++++++++++
> arch/powerpc/include/asm/swiotlb.h | 3 +++
> arch/x86/include/asm/swiotlb.h | 10 ++++++++++
> lib/swiotlb.c | 30 ++++++++++++++++++++++++------
> 4 files changed, 47 insertions(+), 6 deletions(-)

Why can't you use dma_sync_single_* instead of inventing new
swiotlb sync functions?


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