linux-kernel - Re: Linux 2.6.39-rc3

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Date:	Wed, 13 Apr 2011 23:10:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Airlie <airlied@...hat.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Linux 2.6.39-rc3

On 04/13/2011 07:07 PM, Dave Airlie wrote:
>>
>> Okay, staring at this, it definitely seems toxic to overlay the GART
>> over memory areas reserved by the BIOS.  If I were to guess, I would say
>> that the problem here seems to be that the kernel thinks it is
>> overlaying 64 MiB of memory, but the actual GART is in fact 512 MiB in
>> size -- 131072 CPU pages -- which now overlaps the BIOS reserved areas.
>>
>> Alex D., could you comment on the "num cpu pages" bit?
> 
> These are not CPU addresses. I think we've stated that already. Not the
> droids.
> 
> the num cpu pages is how many CPU pages would be needed to fill the GPU
> GTT, for those crazy cases where CPU pagesize != GPU pagesize.
> 

OK, well, something is still weird.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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