linux-kernel - Re: regression fixed by using pci=rom

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Message-ID: <20080509160516.GA6255@us.ibm.com>
Date:	Fri, 9 May 2008 09:05:16 -0700
From:	Gary Hade <garyhade@...ibm.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Airlie <airlied@...il.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Gary Hade <garyhade@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: regression fixed by using pci=rom

On Thu, May 08, 2008 at 11:29:39PM -0700, Jesse Barnes wrote:
> On Thursday, May 08, 2008 6:46 pm Linus Torvalds wrote:
> > On Thu, 8 May 2008, Jesse Barnes wrote:
> > > Hm, yeah in many cases we definitely *do* want to try to get the
> > > expansion ROM space allocated.  But maybe it should be a lower priority
> > > than other BARs... Gary?
> >
> > The thing is, a lot of these things have been done this way because not
> > doing them that way breaks.
> >
> > We want to allocate expansion ROM space - even if we don't enable it -
> > because not doing so will screw up bus sizing etc, and can make it
> > impossible to allocate later.
> >
> > In general, changing PCI allocation strategy is really _really_ dangerous,
> > even when it is "right", because it tends to expose a lot of issues where
> > something worked just because it was perhaps indirectly causing a layout
> > that worked.
> 
> Yeah, that was my first impression too, but the patch went upstream awhile ago 
> and I didn't see any background except for the changelog.
> 
> If anything, we should have a pci=norom option instead, so that big systems 
> that don't need the ROMs can use their address space more efficiently.

This is actually the solution I was going to suggest.  I will 
work on it.

Gary

-- 
Gary Hade
System x Enablement
IBM Linux Technology Center
503-578-4503  IBM T/L: 775-4503
garyhade@...ibm.com
http://www.ibm.com/linux/ltc
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