linux-kernel - Intel driver vs MTRRs conflict

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Date:	Wed, 18 Feb 2009 00:20:46 +0100
From:	"J.A. Magallón" <jamagallon@....com>
To:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Intel driver vs MTRRs conflict

Hi all...

I have a little problem (near religious, not real, as averything works fine)
with the intel driver crying about mtrrs:

[drm] Initialized drm 1.1.0 20060810
pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
pci 0000:00:02.0: setting latency timer to 64
[drm] Initialized i915 1.6.0 20080730 on minor 0
X:3004 conflicting memory types 20000000-30000000 write-combining<->uncached-minus
reserve_memtype failed 0x20000000-0x30000000, track write-combining, req write-combining
X:3004 conflicting memory types 20000000-30000000 write-combining<->uncached-minus
reserve_memtype failed 0x20000000-0x30000000, track write-combining, req write-combining
X:3004 conflicting memory types 20000000-30000000 write-combining<->uncached-minus
reserve_memtype failed 0x20000000-0x30000000, track write-combining, req write-combining
X:3031 freeing invalid memtype 20000000-30000000
X:3004 conflicting memory types 20000000-30000000 write-combining<->uncached-minus
reserve_memtype failed 0x20000000-0x30000000, track write-combining, req write-combining
X:3032 freeing invalid memtype 20000000-30000000
X:3004 conflicting memory types 20000000-30000000 write-combining<->uncached-minus
reserve_memtype failed 0x20000000-0x30000000, track write-combining, req write-combining
X:3033 freeing invalid memtype 20000000-30000000
X:3004 conflicting memory types 20000000-30000000 write-combining<->uncached-minus
reserve_memtype failed 0x20000000-0x30000000, track write-combining, req write-combining
X:3034 freeing invalid memtype 20000000-30000000

But that mtrr is there:

one:~# cat /proc/mtrr
reg00: base=0x000000000 (    0MB), size=  512MB, count=1: write-back
reg01: base=0x01f500000 (  501MB), size=    1MB, count=1: uncachable
reg02: base=0x01f600000 (  502MB), size=    2MB, count=1: uncachable
reg03: base=0x01f800000 (  504MB), size=    8MB, count=1: uncachable
reg04: base=0x020000000 (  512MB), size=  256MB, count=1: write-combining

Where is the problem ? Kernel or driver side ?
This logs are with kernel 2.6.29-rc5, and intel driver 2.6.1.

As I said, everything works. And even fast for the kind of machine, it's an
Aspire One and gears gives 740 fps, and video playback is pretty smooth.
But perhaps it would be faster if X could get that mtrr it claims ?

TIA

-- 
J.A. Magallon <jamagallon()ono!com>     \               Software is like sex:
                                         \         It's better when it's free
Mandriva Linux release 2009.1 (Cooker) for x86_64
Linux 2.6.28.2-desktop-1mnb (gcc 4.3.2 (GCC) #1 Wed Jan
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