linux-kernel - Re: [PATCH] arm64/dma-mapping: Add DMA_ATTR_ALLOC_SINGLE

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]

Message-ID: <1457049649.26149.11.camel@mhfsdcap03>
Date:	Fri, 4 Mar 2016 08:00:49 +0800
From:	Yong Wu <yong.wu@...iatek.com>
To:	Doug Anderson <dianders@...omium.org>
CC:	Joerg Roedel <joro@...tes.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Matthias Brugger" <matthias.bgg@...il.com>,
	Robin Murphy <robin.murphy@....com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	"Arnd Bergmann" <arnd@...db.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>,
	<srv_heupstream@...iatek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] arm64/dma-mapping: Add DMA_ATTR_ALLOC_SINGLE_PAGES
 support

On Thu, 2016-03-03 at 09:44 -0800, Doug Anderson wrote:
> Hi,
> 
> On Wed, Mar 2, 2016 at 10:54 AM, Yong Wu <yong.wu@...iatek.com> wrote:
> > Sometimes it is not worth for the iommu allocating big chunks.
> > Here we enable DMA_ATTR_ALLOC_SINGLE_PAGES which could help avoid to
> > allocate big chunks while iommu allocating buffer.
> >
> > More information about this attribute, please check Doug's commit[1].
> >
> > [1]: https://lkml.org/lkml/2016/1/11/720
> >
> > Cc: Robin Murphy <robin.murphy@....com>
> > Suggested-by: Douglas Anderson <dianders@...omium.org>
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >
> > Our video drivers may soon use this.
> >
> >  arch/arm64/mm/dma-mapping.c |  4 ++--
> >  drivers/iommu/dma-iommu.c   | 14 ++++++++++----
> >  include/linux/dma-iommu.h   |  4 ++--
> >  3 files changed, 14 insertions(+), 8 deletions(-)
> 
> It should also be mentioned that this depends on commit df05c6f6e0bb
> ("ARM: 8506/1: common: DMA-mapping: add DMA_ATTR_ALLOC_SINGLE_PAGES
> attribute") which is not in mainline quite yet.

Thanks. I will add it in the commit message.

> 
> Also please CC Marek Szyprowski on any future patches in this area
> since I saw a patch series from him that was touching this same area.

Will do.

> 
> Reviewed-by: Douglas Anderson <dianders@...omium.org>

Thanks.