linux-kernel - Re: [PATCH 1/1] ARM: tegra: bus_notifier registers IOMMU devices(was: How to specify IOMMU'able devices in DT)

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Date:	Thu, 29 Nov 2012 08:45:15 +0200
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"James.Bottomley@...senPartnership.com" 
	<James.Bottomley@...senPartnership.com>,
	"arnd@...db.de" <arnd@...db.de>, Krishna Reddy <vdumpa@...dia.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"minchan@...nel.org" <minchan@...nel.org>,
	"chunsang.jeong@...aro.org" <chunsang.jeong@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"subashrp@...il.com" <subashrp@...il.com>,
	"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
	"pullip.cho@...sung.com" <pullip.cho@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/1] ARM: tegra: bus_notifier registers IOMMU
 devices(was: How to specify IOMMU'able devices in DT)

On Wed, 28 Nov 2012 19:07:46 +0100
Stephen Warren <swarren@...dotorg.org> wrote:
......
> >>> Please read more about bus notifiers. IMHO a good example is provided in 
> >>> the following thread:
> >>> http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg12238.html
> >>
> >> This bus notifier seems enough flexible to afford the variation of
> >> IOMMU map info, like Tegra ASID, which could be platform-specific, and
> >> the other could be common too. There's already iommu_bus_notifier
> >> too. I'll try to implement something base on this.
> > 
> > Experimentally implemented as below. With the followig patch, each
> > device could specify its own map in DT, and automatically the device
> > would be attached to the map.
> > 
> > There is a case that some devices share a map. This patch doesn't
> > suppor such case yet.
> > 
> > From 8cb75bb6f3a8535a077e0e85265f87c1f1289bfd Mon Sep 17 00:00:00 2001
> > From: Hiroshi Doyu <hdoyu@...dia.com>
> > Date: Wed, 28 Nov 2012 14:47:04 +0200
> > Subject: [PATCH 1/1] ARM: tegra: bus_notifier registers IOMMU devices
> > 
> > platform_bus notifier registers IOMMU devices if dma-window is
> > specified.
> > 
> > Its format is:
> >   dma-window = <"start" "size">;
> > ex)
> >   dma-window = <0x12345000 0x8000>;
> > 
> > Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
> > ---
> >  arch/arm/mach-tegra/board-dt-tegra30.c |   40 ++++++++++++++++++++++++++++++++
> 
> Shouldn't this patch be to the IOMMU driver itself, not the core Tegra code?

That could be possible and cleaner. I'll check if it works.
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