linux-kernel - Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?!

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Date:	Thu, 14 Dec 2006 11:56:13 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Erik Andersen <andersen@...epoet.org>
Cc:	Karsten Weiss <K.Weiss@...ence-computing.de>,
	Christoph Anton Mitterer <calestyo@...entia.net>,
	linux-kernel@...r.kernel.org, Chris Wedgwood <cw@...f.org>
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?!

On Thu, Dec 14, 2006 at 02:52:35AM -0700, Erik Andersen wrote:
> On Thu Dec 14, 2006 at 11:23:11AM +0200, Muli Ben-Yehuda wrote:
> > > I just realized that booting with "iommu=soft" makes my pcHDTV
> > > HD5500 DVB cards not work.  Time to go back to disabling the
> > > memhole and losing 1 GB.  :-(
> > 
> > That points to a bug in the driver (likely) or swiotlb (unlikely), as
> > the IOMMU in use should be transparent to the driver. Which driver is
> > it?
> 
> presumably one of cx88xx, cx88_blackbird, cx8800, cx88_dvb,
> cx8802, cx88_alsa, lgdt330x, tuner, cx2341x, btcx_risc,
> video_buf, video_buf_dvb, tveeprom, or dvb_pll.  It seems
> to take an amazing number of drivers to make these devices
> actually work...

Yikes! do you know which one actually handles the DMA mappings? I
suspect a missnig unmap or sync, which swiotlb requires to sync back
the bounce buffer with the driver's buffer.

Cheers,
Muli
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