linux-kernel - Re: [PATCH/RFC 0/7] iommu: fixes & extensions

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Message-ID: <20110906101535.GT16691@amd.com>
Date:	Tue, 6 Sep 2011 12:15:35 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
CC:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	David Brown <davidb@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC 0/7] iommu: fixes & extensions

On Fri, Sep 02, 2011 at 01:32:29PM -0400, Ohad Ben-Cohen wrote:
> 5 first patches are relatively small iommu fixes/cleanups.
> 
> 2 last patches are proposals for core iommu extensions:
> - Add fault report mechanism, needed for recovery of remote processors
>   trying to access unmapped addresses.
> - Add splitting of memory regions to pages in the iommu core itself
>   (according to hardware capabilities as advertised by the iommu drivers).
>   This is needed to prevent duplication of this logic by
>   the iommu users/drivers themselves.
> 
> The patches are based on Joerg's arm/omap branch.
> 
> Tested with OMAP3 (omap3isp) + OMAP4 (rpmsg/remoteproc).
> 
> Laurent Pinchart (1):
>   iommu/omap-iovmm: support non page-aligned buffers in iommu_vmap
> 
> Ohad Ben-Cohen (6):
>   iommu/omap: cleanup: remove a redundant 'return' statement
>   iommu/core: use the existing IS_ALIGNED macro
>   iommu/omap: ->unmap() should return order of unmapped page
>   iommu/msm: ->unmap() should return order of unmapped page
>   iommu/core: add fault reporting
>   iommu/core: split mapping to page sizes as supported by the hardware

Ok, I applied 1-5 to their respective branches. Patch 6 needs some more
discussion to make sure the interface is generally usable. Patch 7 seems
to be a starting point for now. This definitly requires conversion of
the other IOMMU drivers too.
Please make individual patch-sets from patch 6 and 7 respectivly.

	Joerg

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