linux-kernel - Re: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already assigned

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Message-ID: <4BEDDF87.4040309@zytor.com>
Date:	Fri, 14 May 2010 16:40:55 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Mike Travis <travis@....com>, Bjorn Helgaas <bjorn.helgaas@...com>,
	Mike Habeck <habeck@....com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Jacob Pan <jacob.jun.pan@...el.com>, Tejun Heo <tj@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai <yinghai.lu@...cle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Myron Stowe <myron.stowe@...com>
Subject: Re: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already
 assigned

On 05/14/2010 04:33 PM, Jesse Barnes wrote:
> 
> As for BIOS coordination for dynamic reallocation, yeah there'd be some
> of that.  I think the basic principles would be:
>   1) use BIOS allocations wherever possible
>   2) get an accurate list of available resources from the BIOS for
>      potential remapping later
>   3) allocate resources for BARs and devices as late as possible (e.g.
>      at driver bind time) to avoid allocating more than we need
> 
> But that's a good chunk of work, and as we've seen, PCs in particular
> are really sensitive to having resources moved around too much, so step
> (2) is probably the hardest part.
> 

The real problem that I see, as outlined before, has nothing to do with
the BIOS, but rather the interdependencies between resources.

	-hpa

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