linux-kernel - Re: [PATCH v9 05/13] arm: introduce is_device_dma

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Date:	Tue, 18 Nov 2014 16:49:21 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	<linux@....linux.org.uk>
CC:	<xen-devel@...ts.xensource.com>, <konrad.wilk@...cle.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	<david.vrabel@...rix.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <catalin.marinas@....com>,
	<linux@....linux.org.uk>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [PATCH v9 05/13] arm: introduce is_device_dma_coherent

ping?

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@...citrix.com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> > CC: linux@....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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