linux-kernel - Re: [PATCH v4 3/7] [RFC] arm/arm64: introduce is_dma

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 10 Oct 2014 14:04:10 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Will Deacon <will.deacon@....com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>,
	"david.vrabel@...rix.com" <david.vrabel@...rix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v4 3/7] [RFC] arm/arm64: introduce is_dma_coherent

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@...citrix.com>
> > CC: linux@....linux.org.uk
> > CC: catalin.marinas@....com
> > CC: will.deacon@....com
> > CC: linux-arm-kernel@...ts.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?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/