linux-kernel - Hot plug issue on 2.6.38

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Date:	Mon, 21 Mar 2011 15:28:00 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Yinghai Lu <yinghai@...nel.org>, linux-pci@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Hot plug issue on 2.6.38

> 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.

Sarah Sharp

View attachment "lspci-no-hot-remove.txt" of type "text/plain" (26944 bytes)

View attachment "dmesg.txt" of type "text/plain" (125837 bytes)

View attachment ".config" of type "text/plain" (82049 bytes)