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SubjectRe: [net-next PATCH 04/27] arch/arc: Add option to skip sync on DMA mapping
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On 10/25/2016 02:38 PM, Alexander Duyck wrote:
> This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to
> avoid invoking cache line invalidation if the driver will just handle it
> later via a sync_for_cpu or sync_for_device call.
>
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: linux-snps-arc@lists.infradead.org
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> ---
> arch/arc/mm/dma.c | 5 ++++-

Acked-by: Vineet Gupta <vgupta@synopsys.com>

> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
> index 20afc65..6303c34 100644
> --- a/arch/arc/mm/dma.c
> +++ b/arch/arc/mm/dma.c
> @@ -133,7 +133,10 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
> unsigned long attrs)
> {
> phys_addr_t paddr = page_to_phys(page) + offset;
> - _dma_cache_sync(paddr, size, dir);
> +
> + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
> + _dma_cache_sync(paddr, size, dir);
> +
> return plat_phys_to_dma(dev, paddr);
> }
>
>
>

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