linux-kernel - Re: [Intel IOMMU][patch 7/8] Support for legacy ISA devices

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Date:	Tue, 24 Apr 2007 21:31:09 +0200
From:	Andi Kleen <ak@...e.de>
To:	Ashok Raj <ashok.raj@...el.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, gregkh@...e.de,
	muli@...ibm.com, asit.k.mallick@...el.com,
	suresh.b.siddha@...el.com, anil.s.keshavamurthy@...el.com,
	arjan@...ux.intel.com, shaohua.li@...el.com
Subject: Re: [Intel IOMMU][patch 7/8] Support for legacy ISA devices

On Tuesday 24 April 2007 08:03:06 Ashok Raj wrote:
> Floppy disk drivers dont work well with DMA remapping.

What is the problem? You can't allocate mappings <16MB?

> Its possible to  
> extend the current use for x86_64, but the gain is very little. If someone
> feels compelled to clean this up, its up for grabs. Since these use 16M, we 
> just provide a unity map for the ISA bridge device.
> 

While it's probably not worth for the floppy there are other devices
with similar weird addressing limitations. Some generic handling of it
would be nice.

-Andi
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