Messages in this thread |  | | Date | Fri, 10 Oct 2014 14:04:10 +0100 | From | Stefano Stabellini <> | Subject | Re: [PATCH v4 3/7] [RFC] arm/arm64: introduce is_dma_coherent |
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On Fri, 10 Oct 2014, Will Deacon wrote: > On Fri, Oct 10, 2014 at 12:51:44PM +0100, Stefano Stabellini wrote: > > Introduce a function to check whether a device is dma coherent. > > > > Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> > > CC: linux@arm.linux.org.uk > > CC: catalin.marinas@arm.com > > CC: will.deacon@arm.com > > CC: linux-arm-kernel@lists.infradead.org > > --- > > arch/arm/include/asm/dma-mapping.h | 6 ++++++ > > arch/arm64/include/asm/dma-mapping.h | 5 +++++ > > 2 files changed, 11 insertions(+) > > > > diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h > > index c45b61a..bededbb 100644 > > --- a/arch/arm/include/asm/dma-mapping.h > > +++ b/arch/arm/include/asm/dma-mapping.h > > @@ -126,6 +126,12 @@ static inline int set_arch_dma_coherent_ops(struct device *dev) > > set_dma_ops(dev, &arm_coherent_dma_ops); > > return 0; > > } > > + > > +static inline bool is_dma_coherent(struct device *dev) > > +{ > > + return (__generic_dma_ops(dev) == &arm_coherent_dma_ops); > > +} > > Hmm, what about the IOMMU ops?
Maybe I should check __generic_dma_ops(dev) != &arm_dma_ops? Do you have any better suggestions?
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