linux-kernel - Re: [PATCH 11/33] dma-mapping: move swiotlb arch helpers to a new header

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Date:   Wed, 10 Jan 2018 09:31:45 +0000
From:   Vladimir Murzin <vladimir.murzin@....com>
To:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org
Cc:     linux-mips@...ux-mips.org, linux-ia64@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Guan Xuetao <gxt@...c.pku.edu.cn>, linux-arch@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-c6x-dev@...ux-c6x.org,
        linux-hexagon@...r.kernel.org, x86@...nel.org,
        Konrad Rzeszutek Wilk <konrad@...nok.org>,
        linux-snps-arc@...ts.infradead.org,
        linux-m68k@...ts.linux-m68k.org, patches@...ups.riscv.org,
        linux-metag@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Michal Simek <monstr@...str.eu>, linux-parisc@...r.kernel.org,
        linux-cris-kernel@...s.com, linux-kernel@...r.kernel.org,
        linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 11/33] dma-mapping: move swiotlb arch helpers to a new
 header

On 10/01/18 08:00, Christoph Hellwig wrote:
> index 9110988b92a1..f00833acb626 100644
> --- a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
> +++ b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
> @@ -61,6 +61,14 @@ static inline void plat_post_dma_flush(struct device *dev)
>  {
>  }
>  
> +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> +{
> +	if (!dev->dma_mask)
> +		return false;
> +
> +	return addr + size <= *dev->dma_mask;
> +}
> +

I know it is copy&paste, but it seems it has off by one error and it should be

return addr + size - 1 <= *dev->dma_mask;


>  dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
>  phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
>  

snip...

> diff --git a/arch/mips/include/asm/mach-loongson64/dma-coherence.h b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
> index 1602a9e9e8c2..5cfda8f893e9 100644
> --- a/arch/mips/include/asm/mach-loongson64/dma-coherence.h
> +++ b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
> @@ -17,6 +17,14 @@
>  
>  struct device;
>  
> +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> +{
> +	if (!dev->dma_mask)
> +		return false;
> +
> +	return addr + size <= *dev->dma_mask;


ditto

Cheers
Vladimir