From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Fri, 10 Oct 2014 13:07:03 +0100 Subject: [PATCH v4 3/7] [RFC] arm/arm64: introduce is_dma_coherent In-Reply-To: <1412941908-5850-3-git-send-email-stefano.stabellini@eu.citrix.com> References: <1412941908-5850-3-git-send-email-stefano.stabellini@eu.citrix.com> Message-ID: <20141010120702.GI7755@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > CC: linux at arm.linux.org.uk > CC: catalin.marinas at arm.com > CC: will.deacon at arm.com > CC: linux-arm-kernel at 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? Will