linux-kernel - Re: [PATCH -mm 0/3] convert IOMMUs to use iova

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Date:	Fri, 2 Nov 2007 19:12:27 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	FUJITA Tomonori <tomof@....org>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	James.Bottomley@...elEye.com, jens.axboe@...cle.com,
	jeff@...zik.org, anil.s.keshavamurthy@...el.com, paulus@...ba.org,
	anton@...ba.org, olof@...om.net, tony.luck@...el.com,
	davem@...emloft.net, kyle@...isc-linux.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH -mm 0/3] convert IOMMUs to use iova

On Sat, Nov 03, 2007 at 02:05:39AM +0900, FUJITA Tomonori wrote:

> This patchset convert the PPC64 IOMMU to use the iova code for free
> area management.
> 
> The IOMMUs ignores low level drivers' restrictions, the maximum
> segment size and segment boundary.
> 
> I fixed the former:
> 
> http://thread.gmane.org/gmane.linux.scsi/35602
> 
> The latter makes the free area management complicated. I'd like to
> convert IOMMUs to use the iova code (that intel-iommu introduced)
> for free area management and enable iova to handle segment boundary
> restrictions, rather than fixing all the IOMMUs' free area
> management,

In general it sounds like a great idea, but have you looked at what
impact this has on the performance of the IO path?

Cheers,
Muli
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