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From: Grant Grundler <grundler@parisc-linux.org>
To: Joel Soete <soete.joel@tiscali.be>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] I/O MMU @ fffffffffed20000 is out of mapping resources: re-occured
Date: Wed, 23 Feb 2005 15:00:55 -0700	[thread overview]
Message-ID: <20050223220055.GD26124@colo.lackof.org> (raw)
In-Reply-To: <420B30A200004C1D@mail-1-bnl.tiscali.it>

On Tue, Feb 22, 2005 at 09:30:59AM +0100, Joel Soete wrote:
> Hi all,
> 
> Sorry but this pb:
> Kernel panic - not syncing: /CAD/linux-2.6.11-rc4-pa2-050221/drivers/parisc/sba_iommu.c:
> I/O MMU @ fffffffffed20000 is out of mapping resources
> 
> just re-occured while an apt-get update again.
> (I wrongly though it disappeared because hiden last week eventhought
> I re-mirrored the slice containing deb 'depot')

This is a non-trivial issue that has been around since pci_dma mapping
interface was introduced. Two things need to happen:
1) parisc implements support for dma_mapping_error()
2) drivers use dma_mapping_error() to verify the mapping
   resource they asked for was available.

Sorry, I've been ignoring the issue since I don't see it on my boxes.
I'm not sure why you are seeing it and I'm not.
Likely you have less RAM installed than I (normally 2-4 GB).

Can you try changing sba_mem_ratio to 4 or 2 in drivers/parisc/sba_iommu.c:
/* Ratio of Host MEM to IOV Space size */
static unsigned long sba_mem_ratio = 8;

I'll even take a patch that makes this a commandline parameter :^)
(ie used by both ccio and sba drivers).

sorry,
grant
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  reply	other threads:[~2005-02-23 22:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-02-22  8:30 [parisc-linux] I/O MMU @ fffffffffed20000 is out of mapping resources: re-occured Joel Soete
2005-02-23 22:00 ` Grant Grundler [this message]
2005-02-26 14:44   ` Joel Soete
2005-02-26 18:52     ` Grant Grundler

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