linux-kernel - Re: [PATCH 20/31] avr32: handle page-less SG entries

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Date:	Wed, 12 Aug 2015 11:36:16 +0200
From:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
To:	Christoph Hellwig <hch@....de>
Cc:	torvalds@...ux-foundation.org, axboe@...nel.dk,
	dan.j.williams@...el.com, vgupta@...opsys.com,
	hskinnemoen@...il.com, realmz6@...il.com, dhowells@...hat.com,
	monstr@...str.eu, x86@...nel.org, dwmw2@...radead.org,
	alex.williamson@...hat.com, grundler@...isc-linux.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-metag@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
	linux-xtensa@...ux-xtensa.org, linux-nvdimm@...1.01.org,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 20/31] avr32: handle page-less SG entries

Around Wed 12 Aug 2015 09:05:39 +0200 or thereabout, Christoph Hellwig wrote:
> Make all cache invalidation conditional on sg_has_page() and use
> sg_phys to get the physical address directly, bypassing the noop
> page_to_bus.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Acked-by: Hans-Christian Egtvedt <egtvedt@...fundet.no>

> ---
>  arch/avr32/include/asm/dma-mapping.h | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/avr32/include/asm/dma-mapping.h b/arch/avr32/include/asm/dma-mapping.h
> index ae7ac92..a662ce2 100644
> --- a/arch/avr32/include/asm/dma-mapping.h
> +++ b/arch/avr32/include/asm/dma-mapping.h
> @@ -216,11 +216,9 @@ dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
>  	struct scatterlist *sg;
>  
>  	for_each_sg(sglist, sg, nents, i) {
> -		char *virt;
> -
> -		sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
> -		virt = sg_virt(sg);
> -		dma_cache_sync(dev, virt, sg->length, direction);
> +		sg->dma_address = sg_phys(sg);
> +		if (sg_has_page(sg))
> +			dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
>  	}
>  
>  	return nents;
> @@ -328,8 +326,10 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
>  	int i;
>  	struct scatterlist *sg;
>  
> -	for_each_sg(sglist, sg, nents, i)
> -		dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
> +	for_each_sg(sglist, sg, nents, i) {
> +		if (sg_has_page(sg))
> +			dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
> +	}
>  }
>  
>  /* Now for the API extensions over the pci_ one */
-- 
mvh
Hans-Christian Egtvedt
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