linux-kernel - Re: [PATCH 10/11] swiotlb-xen: merge xen_unmap_single into xen_swiotlb_unmap

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Date:   Thu, 29 Aug 2019 15:48:11 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Christoph Hellwig <hch@....de>
cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        xen-devel@...ts.xenproject.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/11] swiotlb-xen: merge xen_unmap_single into
 xen_swiotlb_unmap_page

On Mon, 26 Aug 2019, Christoph Hellwig wrote:
> No need for a no-op wrapper.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>

> ---
>  drivers/xen/swiotlb-xen.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 95911ff9c11c..384304a77020 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -414,9 +414,8 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
>   * After this call, reads by the cpu to the buffer are guaranteed to see
>   * whatever the device wrote there.
>   */
> -static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
> -			     size_t size, enum dma_data_direction dir,
> -			     unsigned long attrs)
> +static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
> +		size_t size, enum dma_data_direction dir, unsigned long attrs)
>  {
>  	phys_addr_t paddr = xen_bus_to_phys(dev_addr);
>  
> @@ -430,13 +429,6 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
>  		swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs);
>  }
>  
> -static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
> -			    size_t size, enum dma_data_direction dir,
> -			    unsigned long attrs)
> -{
> -	xen_unmap_single(hwdev, dev_addr, size, dir, attrs);
> -}
> -
>  static void
>  xen_swiotlb_sync_single_for_cpu(struct device *dev, dma_addr_t dma_addr,
>  		size_t size, enum dma_data_direction dir)
> @@ -477,7 +469,8 @@ xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
>  	BUG_ON(dir == DMA_NONE);
>  
>  	for_each_sg(sgl, sg, nelems, i)
> -		xen_unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir, attrs);
> +		xen_swiotlb_unmap_page(hwdev, sg->dma_address, sg_dma_len(sg),
> +				dir, attrs);
>  
>  }
>  
> -- 
> 2.20.1
>