linux-kernel - Re: [PATCH -mm] fix per-device dma_mapping

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Message-Id: <20080702132903E.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 2 Jul 2008 13:29:19 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	fujita.tomonori@....ntt.co.jp, alexisb@...ibm.com,
	linux-kernel@...r.kernel.org, muli@...ibm.com, mingo@...e.hu
Subject: Re: [PATCH -mm] fix per-device dma_mapping_ops support

On Tue, 1 Jul 2008 21:06:20 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 2 Jul 2008 12:43:39 +0900 FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > My initial patch has some bugs (wasn't tested because I don't have
> > Calgary hardware) but Alexis fixed the problems and submitted new one
> > (he successfully tested it). I had one minor comment about it then he
> > submitted another one.
> > 
> > http://marc.info/?l=linux-kernel&m=121329005131176&w=2
> > 
> > I think that it can get into mainline with the dma-mapping-per-device
> > patchset.
> > 
> > As we discussed, we could do better but it takes some time. I think
> > that it's better to fix Calgary problems now. Then I'll try to improve
> > dma-mapping-per-device stuff.
> > 
> > Here's a repost of Alexis's latest patch.
> > 
> > Thanks,
> > 
> > =
> > From: Alexis Bruemmer <alexisb@...ibm.com>
> > Subject: [PATCH] x86 calgary: fix handling of devces that aren't behind the Calgary
> > 
> > The calgary code can give drivers addresses above 4GB which is very
> > bad for hardware that is only 32bit DMA addressable.
> > 
> > With this patch, the calgary code sets the global dma_ops to swiotlb
> > or nommu properly, and the dma_ops of devices behind the
> > Calgary/CalIOC2 to calgary_dma_ops. So the calgary code can handle
> > devices safely that aren't behind the Calgary/CalIOC2.
> > 
> 
> OK..  Looks like this needs to be folded into
> dma-mapping-x86-per-device-dma_mapping_ops-support prior to merging to
> keep everything bisect-happy.

This doesn't need to be fold though it could.

This patch uses per-device-dma_mapping_ops support so this need to be
applied after the per-device-dma_mapping_ops patchset.


> > +		if(translation_enabled(tbl))
> 
> checkpatch?

Oops, sorry about that.
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