linux-kernel - Re: resource map sanity check conflict

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Date:	Mon, 13 Dec 2010 11:02:46 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	David Airlie <airlied@...ux.ie>,
	LKML <linux-kernel@...r.kernel.org>, abelay@....edu,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: resource map sanity check conflict

On 12/08/2010 08:56 PM, Bjorn Helgaas wrote:
> On Monday, December 06, 2010 01:34:56 pm Bjorn Helgaas wrote:
>> On Monday, December 06, 2010 01:17:33 pm Jiri Slaby wrote:
>>> On 11/24/2010 08:22 PM, Bjorn Helgaas wrote:
>>>> On Wednesday, November 24, 2010 06:36:01 am Jiri Slaby wrote:
> ...
>>>>> pnp 00:0a: [mem 0xfed40000-0xfed44fff]
>>>>> pnp 00:0a: Plug and Play ACPI device, IDs ATM1200 PNP0c31 (active)
>>>>> ...
>>>>> resource map sanity check conflict: 0xfed40000 0xfed44fff 0xfed44000
> ...
>>>> Yes, this is related to the PCI resource changes I made recently.
>>>> We used to allocate PCI resources from low addresses first and work
>>>> upwards, and now we do the reverse.  So in 2.6.36, the "Intel Flush
>>>> Page" was probably allocated low in the [mem 0x7e000000-0xfebfffff]
>>>> window, but now we put it in the [mem 0xfed40000-0xfed4bfff] window:
>>>>
>>>>   pci_root PNP0A08:00: host bridge window [mem 0x000dc000-0x000dffff]
>>>>   pci_root PNP0A08:00: host bridge window [mem 0xfed40000-0xfed4bfff]
>>>>
>>>> I think the problem is that we ignore most of what ACPI tells us
>>>> about motherboard device resource usage.  We do have the "system"
>>>> driver, which reserves resources used by PNP0c01 and PNP0c02 devices,
>>>> but we don't do anything about other devices like the ATM1200/PNP0c31
>>>> device which, in your case, is using some of the space in that
>>>> [mem 0xfed40000-0xfed4bfff] host bridge window.
> 
>>> I created the bko entry some time ago:
>>> https://bugzilla.kernel.org/show_bug.cgi?id=23802
> 
> I have a patch here for testing:
> 
>   https://bugzilla.kernel.org/attachment.cgi?id=39262

Yes, it works:
https://bugzillafiles.novell.org/attachment.cgi?id=404327

thanks,
-- 
js
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