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: <4C0EE5FF.5080003@zytor.com>
Date:	Tue, 08 Jun 2010 17:53:19 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>, Mike Travis <travis@....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>,
	Mike Habeck <habeck@....com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org
Subject: Re: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already
 assigned

On 06/02/2010 08:53 AM, Jesse Barnes wrote:
>>
>> That's what I thought, which I guess means my original question to Mike 
>> still stands...
> 
> I thought the whole reason for this was hotplug; we don't want to
> exhaust I/O space unnecessarily by allocating resources for BARs the
> BIOS didn't assign so we can keep them around for later hotplug
> activity.
> 
> If there's some other issue, it's not too late to drop this patch.
> 

Okay, now... this means that if a device that the BIOS doesn't know
about, but which needs I/O addresses, then it will work if hotplugged,
but not if it is plugged in on system boot?

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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