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SubjectRe: [PATCH v9 05/13] arm: introduce is_device_dma_coherent
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On Fri, 14 Nov 2014, Stefano Stabellini wrote:
> Russell,
> this patch needs your feedback.
>
> - Stefano
>
> On Wed, 12 Nov 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@eu.citrix.com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> > Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> > CC: linux@arm.linux.org.uk
> > ---
> > 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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