linux-kernel - Re: [Linux 2.6.29-rc6] [drm:i915_set_status_page] *ERROR* can not ioremap virtual address for G33 hw status page

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Date:	Tue, 24 Feb 2009 20:44:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Andy Isaacson <adi@...apodia.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Eric Anholt <eric@...olt.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"lenb@...nel.org" <lenb@...nel.org>, mjg@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>, rui.zhang@...el.com,
	airlied@...hat.com
Subject: Re: [Linux 2.6.29-rc6] [drm:i915_set_status_page] *ERROR* can not
	ioremap virtual address for G33 hw status page


* Yinghai Lu <yinghai@...nel.org> wrote:

> On Mon, Feb 23, 2009 at 7:23 PM, Andy Isaacson <adi@...apodia.org> wrote:
> > On Mon, Feb 23, 2009 at 05:01:10PM -0800, Yinghai Lu wrote:
> >> CONFIG_MTRR=y
> >> CONFIG_MTRR_SANITIZER=y
> >> CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
> >> CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
> >>
> >> should help mtrr ones.
> >>
> >> please post bootlog with those option set.
> >
> > Doesn't help here (Dell E6400).
> >
> > [    0.000000] Initializing cgroup subsys cpuset
> > [    0.000000] Initializing cgroup subsys cpu
> > [    0.000000] Linux version 2.6.29-rc6-dirty (adi@...-loaner-01) (gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu12) ) #14 SMP Mon Feb 23 19:05:31 PST 2009
> > [    0.000000] Command line: root=/dev/sda1 ro
> > [    0.000000] KERNEL supported cpus:
> > [    0.000000]   Intel GenuineIntel
> > [    0.000000]   AMD AuthenticAMD
> > [    0.000000]   Centaur CentaurHauls
> > [    0.000000] BIOS-provided physical RAM map:
> > [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
> > [    0.000000]  BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
> > [    0.000000]  BIOS-e820: 0000000000100000 - 000000007d04d400 (usable)
> > [    0.000000]  BIOS-e820: 000000007d04d400 - 000000007d04f400 (ACPI NVS)
> > [    0.000000]  BIOS-e820: 000000007d04f400 - 0000000080000000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000f8000000 - 00000000fc000000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000fed18000 - 00000000fed1c000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000fed20000 - 00000000fed90000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000feda0000 - 00000000feda6000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000ffe60000 - 0000000100000000 (reserved)
> > [    0.000000] DMI 2.4 present.
> > [    0.000000] last_pfn = 0x7d04d max_arch_pfn = 0x100000000
> > [    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
> > [    0.000000] original variable MTRRs
> > [    0.000000] reg 0, base: 0GB, range: 32GB, type WB
> > [    0.000000] reg 1, base: 3584MB, range: 512MB, type UC
> > [    0.000000] reg 2, base: 2012MB, range: 4MB, type UC
> > [    0.000000] reg 3, base: 2016MB, range: 32MB, type UC
> 
> the BIOS is so sick
> according to MTRR, it said:
> [0,2012M) is WB
> [2048M, 3.5G) is WB too
> [4G, 32G) is WB
> 
> but according to e820: about [0,2g) is RAM...
> 
> really not how to workaround in BIOS.

I suspect the box was tested with other OSs and limped along 
there. Should we perhaps clear non-sensical MTRR entries?

	Ingo
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