Re: [Xen-devel] [PATCH v7 3/8] arm64: introduce is_device_dma_coherent

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 27 Oct 2014, Stefano Stabellini wrote:
> Introduce a boolean flag and an accessor function to check whether a
> device is dma_coherent. Set the flag from set_arch_dma_coherent_ops.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> CC: will.deacon@xxxxxxx

Will, Catalin,
are you OK with this patch?


>  arch/arm64/include/asm/device.h      |    1 +
>  arch/arm64/include/asm/dma-mapping.h |    6 ++++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/device.h b/arch/arm64/include/asm/device.h
> index cf98b36..243ef25 100644
> --- a/arch/arm64/include/asm/device.h
> +++ b/arch/arm64/include/asm/device.h
> @@ -21,6 +21,7 @@ struct dev_archdata {
>  #ifdef CONFIG_IOMMU_API
>       void *iommu;                    /* private IOMMU data */
>  #endif
> +     bool dma_coherent;
>  };
>  
>  struct pdev_archdata {
> diff --git a/arch/arm64/include/asm/dma-mapping.h 
> b/arch/arm64/include/asm/dma-mapping.h
> index adeae3f..e213dc4 100644
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ b/arch/arm64/include/asm/dma-mapping.h
> @@ -54,11 +54,17 @@ static inline void set_dma_ops(struct device *dev, struct 
> dma_map_ops *ops)
>  
>  static inline int set_arch_dma_coherent_ops(struct device *dev)
>  {
> +     dev->archdata.dma_coherent = true;
>       set_dma_ops(dev, &coherent_swiotlb_dma_ops);
>       return 0;
>  }
>  #define set_arch_dma_coherent_ops    set_arch_dma_coherent_ops
>  
> +static inline bool is_device_dma_coherent(struct device *dev)
> +{
> +     return dev->archdata.dma_coherent;
> +}
> +
>  #include <asm-generic/dma-mapping-common.h>
>  
>  static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
> -- 
> 1.7.10.4
> 

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