linux-kernel - Re: [PATCH] x86/PCI: never allocate PCI MMIO resources below BIOS

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Message-ID: <20100426183436.GV11130@hexapodia.org>
Date:	Mon, 26 Apr 2010 11:34:36 -0700
From:	Andy Isaacson <adi@...apodia.org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	"R. Andrew Bailey" <bailey@...mai.com>,
	Yinghai <yinghai.lu@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, guenter.roeck@...csson.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>, yaneti@...lera.com
Subject: Re: [PATCH] x86/PCI: never allocate PCI MMIO resources below
	BIOS_END

On Fri, Apr 23, 2010 at 05:05:24PM -0600, Bjorn Helgaas wrote:
> On Wednesday 21 April 2010 01:31:20 pm Andy Isaacson wrote:
> > On Tue, Apr 20, 2010 at 10:33:50PM -0700, Yinghai wrote:
> > > Update e820 at first, and later put them resource tree.
> > > Reserved that early, will not be allocated to unassigned PCI BAR
> > > 
> > > v3: remove probe_roms() that is not needed, because whole range is reserved
> > > 	 already
> > 
> > Test booted this patch series on the problematic t3400, seems to work
> > fine.  dmesg attached to bug 15744.
> 
> Thanks for testing (again).  I'm not confident that this series is
> going to be successful, so I started looking for other approaches.
> 
> I can't reproduce the exact problem you're seeing, but in my
> kludged-up attempt, the patch below is enough to keep us from
> assigning the space below 1MB to a device.
> 
> Would you guys (Andy & Andy, what a coincidence :-)) mind giving
> it a try?  This is intended to work on top of current upstream,
> with no other patches required.
> 
> Bjorn
> 
> 
> commit 7fb707eb97fdf6dc4fa4b127f127f8d00223afc7
> Author: Bjorn Helgaas <bjorn.helgaas@...com>
> Date:   Fri Apr 23 15:22:10 2010 -0600
> 
> x86/PCI: never allocate PCI MMIO resources below BIOS_END
>     
> When we move a PCI device or assign resources to a device not configured
> by the BIOS, we want to avoid the BIOS region below 1MB.  Note that if the
> BIOS places devices below 1MB, we leave them there.

Works for me.  dmesg at
https://bugzilla.kernel.org/attachment.cgi?id=26150

-andy
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