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 11:48:31 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
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

Ingo Molnar wrote:
> * 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?
> 

according to e820 to update MTRR?

in the previous discussion, some SMI region that is not stated in e820 could still need to be covered by MTRR with WB

YH
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