linux-kernel - Re: [RFC PATCH 1/2] pci: don't assume pref memio are 64bit -v3

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Message-ID: <49EFBB0E.3030401@kernel.org>
Date:	Wed, 22 Apr 2009 17:49:18 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, yannick.roehlly@...e.fr
Subject: Re: [RFC PATCH 1/2] pci: don't assume pref memio are 64bit -v3

Jesse Barnes wrote:
> On Wed, 22 Apr 2009 15:37:04 -0700
> Yinghai Lu <yinghai@...nel.org> wrote:
> 
>> one system with 4g installed ( there is 1g hole)
>>
>> when 4G installed.
>> BIOS put ACPI etc need the hole
>> [    0.000000] BIOS-provided physical RAM map:
>> [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009bc00
>> (usable) [    0.000000]  BIOS-e820: 000000000009bc00 -
>> 00000000000a0000 (reserved) [    0.000000]  BIOS-e820:
>> 00000000000e3000 - 0000000000100000 (reserved) [    0.000000]
>> BIOS-e820: 0000000000100000 - 00000000bffa0000 (usable)
>> [    0.000000]  BIOS-e820: 00000000bffa0000 - 00000000bffae000 (ACPI
>> data) [    0.000000]  BIOS-e820: 00000000bffae000 - 00000000bfff0000
>> (ACPI NVS) [    0.000000]  BIOS-e820: 00000000bfff0000 -
>> 00000000c0000000 (reserved) [    0.000000]  BIOS-e820:
>> 00000000fee00000 - 00000000fee01000 (reserved) [    0.000000]
>> BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
>> [    0.000000]  BIOS-e820: 0000000100000000 - 0000000140000000
>> (usable) so in kernel resource will be reserved for 0xbffa0000 -
>> 0xbfff0000 for ACPI 0x100000 -  0xbffa0000 for RAM...
>>
>> and BIOS set
>> [    0.240007] pci 0000:00:01.0: bridge 64bit mmio pref:
>> [0xbdf00000-0xddefffff] [    0.237102] pci 0000:01:00.0: reg 10 32bit
>> mmio: [0xc0000000-0xcfffffff] that is conflict with reserved res. so
>> it can not be reserved Kernel.
>>
>> then Kernel try to get range from 0x140000000 ( above the RAM, 5G and
>> above 4g) and set let the bridge to use it, and ATI cards to use it.
>>
>> but the problem is that ATI only support 32bit ...
> 
> So Ivan's patch didn't work for you for this problem?  I was planning
> on applying it, but it would be nice to get some test results first.

looks like Ivan patch still has some problem. 

YH
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