linux-kernel - Re: [PATCH]: PCI: GART iommu alignment fixes [v2]

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Message-Id: <20080724234111I.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 24 Jul 2008 23:40:30 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	prarit@...hat.com
Cc:	fujita.tomonori@....ntt.co.jp, joro@...tes.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	jbarnes@...tuousgeek.org, ed.pollard@....com, epollard@...hat.com
Subject: Re: [PATCH]: PCI: GART iommu alignment fixes [v2]

On Thu, 24 Jul 2008 10:31:58 -0400
Prarit Bhargava <prarit@...hat.com> wrote:

> 
> >> But I think Prarit is right with this change. If the interface defines
> >> this behavior the IOMMU drivers have to implement it. I am just
> >> wondering that the problem never showed up before. The GART driver is a
> >> few years old now.
> >>     
> >
> > Yeah, I'm not against fixing IOMMUs to make alloc_consistent return
> > the reqeuested size aligned memory. My point is that it's not likely
> > to fix anything. Even with the patch, we hit the above problem because
> > as I explained, the root cause of the problem is the boundary issue;
> > we need to fix pci-dma.c
> >
> >   
> 
> Sorry, I misquoted code up there and was looking for a clear example of 
> where this would happen.  The issue I'm trying to resolve didn't happen 
> on the skge -- it was just a convenient piece of code to examine and 
> point out ;)

So please tell us what driver you hit the bug with. Can you give us
the details?

Thanks,
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