From mboxrd@z Thu Jan  1 00:00:00 1970
From: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [RFC PATCH] iommu: add ARM short descriptor page table allocator.
Date: Tue, 5 May 2015 18:05:41 +0100
Message-ID: <20150505170541.GN1550@arm.com>
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To: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
Cc: "srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org" <srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>, "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Tomasz Figa <tfiga-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" <iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>, "linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>, Matthias Brugger <matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>, Lucas Stach <l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
List-Id: linux-mediatek@lists.infradead.org

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-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> > ---
> >  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