linux-kernel - Re: [PATCH 19/31] arc: handle page-less SG entries

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Date:	Wed, 12 Aug 2015 10:28:55 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Christoph Hellwig <hch@....de>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"axboe@...nel.dk" <axboe@...nel.dk>
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	"hskinnemoen@...il.com" <hskinnemoen@...il.com>,
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Subject: Re: [PATCH 19/31] arc: handle page-less SG entries

On Wednesday 12 August 2015 12:39 PM, Christoph Hellwig wrote:
> Make all cache invalidation conditional on sg_has_page() and use
> sg_phys to get the physical address directly.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

With a minor nit below.

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

> ---
>  arch/arc/include/asm/dma-mapping.h | 26 +++++++++++++++++++-------
>  1 file changed, 19 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h
> index 2d28ba9..42eb526 100644
> --- a/arch/arc/include/asm/dma-mapping.h
> +++ b/arch/arc/include/asm/dma-mapping.h
> @@ -108,9 +108,13 @@ dma_map_sg(struct device *dev, struct scatterlist *sg,
>  	struct scatterlist *s;
>  	int i;
>  
> -	for_each_sg(sg, s, nents, i)
> -		s->dma_address = dma_map_page(dev, sg_page(s), s->offset,
> -					       s->length, dir);
> +	for_each_sg(sg, s, nents, i) {
> +		if (sg_has_page(s)) {
> +			_dma_cache_sync((unsigned long)sg_virt(s), s->length,
> +					dir);
> +		}
> +		s->dma_address = sg_phys(s);
> +	}
>  
>  	return nents;
>  }
> @@ -163,8 +167,12 @@ dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems,
>  	int i;
>  	struct scatterlist *sg;
>  
> -	for_each_sg(sglist, sg, nelems, i)
> -		_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
> +	for_each_sg(sglist, sg, nelems, i) {
> +		if (sg_has_page(sg)) {
> +			_dma_cache_sync((unsigned int)sg_virt(sg), sg->length,
> +					dir);
> +		}
> +	}
>  }
>  
>  static inline void
> @@ -174,8 +182,12 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
>  	int i;
>  	struct scatterlist *sg;
>  
> -	for_each_sg(sglist, sg, nelems, i)
> -		_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
> +	for_each_sg(sglist, sg, nelems, i) {
> +		if (sg_has_page(sg)) {
> +			_dma_cache_sync((unsigned int)sg_virt(sg), sg->length,
> +				dir);

For consistency, could u please fix the left alignment of @dir above - another tab
perhaps ?

> +		}
> +	}
>  }
>  
>  static inline int dma_supported(struct device *dev, u64 dma_mask)

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