linux-kernel - Re: [Bug #13001] PCI-DMA: Out of IOMMU space

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Date:	Tue, 28 Apr 2009 18:43:49 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	optimusgd@...il.com
Cc:	fujita.tomonori@....ntt.co.jp, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	grundler@...gle.com
Subject: Re: [Bug #13001] PCI-DMA: Out of IOMMU space

On Tue, 28 Apr 2009 14:18:57 +0500
**UNKNOWN CHARSET** <optimusgd@...il.com> wrote:

> No, it is regression. I can reproduce that without allowdac and any
> other unnecessary boot options.

Hmm, in the bug repport, you said that you can't reproduce the problem:

http://bugzilla.kernel.org/show_bug.cgi?id=13001#c15

I can't find your comment like, "I can reproduce that without
allowdac".

> In later discussion Grant Grundler ask
> me apply patch that show 32 bit dma devices in my system. Results I
> attached to bugreport. Looks like only one 32 bit dma device in my
> system is ata controller, sata-nv.

Hmm, looks like http://bugzilla.kernel.org/attachment.cgi?id=20895
said that pata_amd and sata_nv use 32bit dma mask.


> I can stable reproduce IOMMU out of space when I write data to sata
> drive.

Ok, let's figure out what's wrong.

First, can you test v2.6.30-rc3 with the following patch?

http://www.kernel.org/pub/linux/kernel/people/tomo/misc/gart-debug.diff


Note that please enable CONFIG_DMA_API_DEBUG, CONFIG_IOMMU_DEBUG, and
CONFIG_IOMMU_LEAK and see if you can reproduce the problem (of course,
don't use any kernel option).

When the kernel is out of IOMMU space, it prints some useful
information.
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