linux-kernel - Re: [RFC PATCH] iommu: add ARM short descriptor page table allocator.

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Date:	Tue, 5 May 2015 18:05:41 +0100
From:	Will Deacon <will.deacon@....com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Yong Wu <yong.wu@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Robin Murphy <Robin.Murphy@....com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	"srv_heupstream@...iatek.com" <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" <iommu@...ts.linux-foundation.org>
Subject: Re: [RFC PATCH] iommu: add ARM short descriptor page table allocator.

On Tue, May 05, 2015 at 05:18:02PM +0100, Joerg Roedel wrote:
> On Tue, Apr 28, 2015 at 03:41:21PM +0800, Yong Wu wrote:
> > This patch is for ARM Short Descriptor Format.It has 2-levels
> > pagetable and the allocator supports 4K/64K/1M/16M.
> > 
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >  drivers/iommu/Kconfig                |   7 +
> >  drivers/iommu/Makefile               |   1 +
> >  drivers/iommu/io-pgtable-arm-short.c | 489 +++++++++++++++++++++++++++++++++++
> >  drivers/iommu/io-pgtable.c           |   4 +
> >  drivers/iommu/io-pgtable.h           |   6 +
> >  5 files changed, 507 insertions(+)
> >  create mode 100644 drivers/iommu/io-pgtable-arm-short.c
> 
> What is the context of this, where will it be used?

I think the MT8173 IOMMU [1] uses this format and, since it's part of
the ARM architecture, the ARM SMMU can make use of it too if the
implementation supports it.

Will

[1]
http://lists.infradead.org/pipermail/linux-mediatek/2015-March/000058.html
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