linux-kernel - Re: [patch take 2][Intel-IOMMU] Fix for IOMMU early crash

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Message-Id: <1191469179.22572.145.camel@pasglop>
Date:	Thu, 04 Oct 2007 13:39:39 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, Greg KH <greg@...ah.com>,
	muli@...ibm.com, paulus@...ba.org, kristen.c.accardi@...el.com
Subject: Re: [patch take 2][Intel-IOMMU] Fix for IOMMU early crash


> > Why don't you use the new struct dev_archdata mechanism ? That's what I
> > use on powerpc to provide optional iommu linkage to any device in the
> > system.
> Good one. I will certainly try out your idea and will update the list
> tomorrow.

The advantage is that it allows to completely isolate the iommu code
from any dependency to PCI, which means you can implement DMA ops
support for various platform devices or other fancy things. Maybe not
the most useful in x86-land, but still ;-)

Ben.


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