Re: Hot plug issue on 2.6.38
From: Rafael J. Wysocki
Date: Mon Mar 21 2011 - 18:51:45 EST
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:
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