From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Subject: Re: Hot plug issue on 2.6.38
Date: Mon, 21 Mar 2011 23:51:12 +0100
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Cc: Yinghai Lu <yinghai@kernel.org>, linux-pci@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Jesse Barnes <jbarnes@virtuousgeek.org>,
        ACPI Devel Mailing List <linux-acpi@vger.kernel.org>,
        Len Brown <lenb@kernel.org>, Matthew Garrett <mjg59@srcf.ucam.org>
References: <201103052254.48515.rjw@sisk.pl> <20110317215609.GA5917@xanatos> <20110321222705.GA4139@xanatos>
In-Reply-To: <20110321222705.GA4139@xanatos>
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On Monday, March 21, 2011, Sarah Sharp wrote:
> > On Thu, Mar 17, 2011 at 10:22:33PM +0100, Rafael J. Wysocki wrote:
> > > On Thursday, March 17, 2011, Yinghai Lu wrote:
> > > > her .config does not define PCI_MMCONFIG
> > > > 
> > > > #
> > > > # Bus options (PCI etc.)
> > > > #
> > > > CONFIG_PCI=y
> > > > CONFIG_PCI_DIRECT=y
> > > > # CONFIG_PCI_MMCONFIG is not set
> > > 
> > > Ah, good catch, thanks!
> > > 
> > > @Sarah: you need to set that for PCI Express to work in general.
> 
> I compiled 2.6.38 with CONFIG_PCI_MMCONFIG=y, and I'm no longer getting
> "irq nobody cared" messages.  However, PCI express hot plug seems to
> just not work for the xHCI PCI device.  Nothing appears in dmesg when I
> plug in the Express Card, and the device doesn't appear in lspci.
> However, I can get the card to show up if I run
> 
> 	echo 1 > /sys/bus/pci/rescan
> 
> PCI hot-remove doesn't seem to work either.  The xHCI driver notices the
> device got removed when the debugging polling loop runs, but the
> driver's PCI remove functions are never called.  A rescan of the bus
> doesn't help, and the device still shows up in lspci (although all the
> registers are read as 0xffff). dmesg and lspci after the device has been
> removed is attached.
> 
> I've tried turning on all the PCI config options that look relavant; my
> .config is attached.  I've turned on PCI debug too.  The only thing that
> looks PCI related that I don't have turned on is ACPI_PCI_SLOT.  Do I
> need that?
> 
> I'm not sure how to debug this hot plug issue further.

Well, we still don't seem to call the _OSC on this machine.  At least your
dmesg output doesn't indicate so.

Do you have the patch from:

https://patchwork.kernel.org/patch/604371/

applied?

Rafael
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