linux-kernel - Re: PCIe Hotplug: NFG unless I boot with card already inserted.

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Message-ID: <20071016223342.GE1314@closure.lan>
Date:	Tue, 16 Oct 2007 18:33:42 -0400
From:	Theodore Tso <tytso@....edu>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	Mark Lord <lkml@....ca>, pcihpd-discuss@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCIe Hotplug:  NFG unless I boot with card already inserted.

On Tue, Oct 16, 2007 at 02:01:16PM -0700, Kristen Carlson Accardi wrote:
> > 
> > I believe the code is leaning too heavily on the BIOS for stuff,
> > and like lots of other parts of the kernel we'll need an alternate
> > strategy for when things aren't "perfect".
> 
> the pitfall for forcing pciehp when the BIOS hasn't provided OSC is that
> you don't know for sure that you really have gained control of hot plug
> operation properly.  You can obviously try it, using the provide forcing
> option as you have done, but the behavior is not predictable.

The bigger concern is whether this likely to break things on systems
that *do* correctly implement ACPI support for PCIe hotplug?

     	  	    	      	   	       - Ted


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