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    Subject[PATCH v8 05/13] arm: introduce is_device_dma_coherent
    Date
    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@eu.citrix.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    CC: linux@arm.linux.org.uk
    CC: will.deacon@arm.com
    ---
    arch/arm/include/asm/device.h | 1 +
    arch/arm/include/asm/dma-mapping.h | 6 ++++++
    2 files changed, 7 insertions(+)

    diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h
    index dc662fc..4111592 100644
    --- a/arch/arm/include/asm/device.h
    +++ b/arch/arm/include/asm/device.h
    @@ -17,6 +17,7 @@ struct dev_archdata {
    #ifdef CONFIG_ARM_DMA_USE_IOMMU
    struct dma_iommu_mapping *mapping;
    #endif
    + bool dma_coherent;
    };

    struct omap_device;
    diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
    index 85738b2..8c3b616 100644
    --- a/arch/arm/include/asm/dma-mapping.h
    +++ b/arch/arm/include/asm/dma-mapping.h
    @@ -123,11 +123,17 @@ static inline unsigned long dma_max_pfn(struct device *dev)

    static inline int set_arch_dma_coherent_ops(struct device *dev)
    {
    + dev->archdata.dma_coherent = true;
    set_dma_ops(dev, &arm_coherent_dma_ops);
    return 0;
    }
    #define set_arch_dma_coherent_ops(dev) set_arch_dma_coherent_ops(dev)

    +static inline bool is_device_dma_coherent(struct device *dev)
    +{
    + return dev->archdata.dma_coherent;
    +}
    +
    static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
    {
    unsigned int offset = paddr & ~PAGE_MASK;
    --
    1.7.10.4


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