linux-kernel - Re: pci-express hotplug

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Date:	Mon, 26 Oct 2009 11:54:19 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Alex Chiang <achiang@...com>
Cc:	Mark Lord <lkml@....ca>, Greg KH <greg@...ah.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org
Subject: Re: pci-express hotplug

On Tue, Oct 20 2009, Alex Chiang wrote:
> * Jens Axboe <jens.axboe@...cle.com>:
> > On Tue, Oct 13 2009, Alex Chiang wrote:
> > > > > Can you modprobe acpiphp with debug=1? And send the output?
> > > > 
> > > > acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
> > > > acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:00:05.0
> > > > acpiphp_glue: found ACPI PCI Hotplug slot 1 at PCI 0000:08:00
> > > > acpiphp: Slot [1] registered
> > > > acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:00:07.0
> > > > acpiphp_glue: found ACPI PCI Hotplug slot 2 at PCI 0000:0b:00
> > > > acpiphp: Slot [2] registered
> > > > acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:80:07.0
> > > > acpiphp_glue: found ACPI PCI Hotplug slot 6 at PCI 0000:84:00
> > > > acpiphp: Slot [6] registered
> > > > acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:80:09.0
> > > > acpiphp_glue: found ACPI PCI Hotplug slot 7 at PCI 0000:87:00
> > > > acpiphp: Slot [7] registered
> > > > acpiphp_glue: Bus 0000:87 has 1 slot
> > > > acpiphp_glue: Bus 0000:84 has 1 slot
> > > > acpiphp_glue: Bus 0000:0b has 1 slot
> > > > acpiphp_glue: Bus 0000:08 has 1 slot
> > > > acpiphp_glue: Total 4 slots
> > > 
> > > You mentioned in another mail that you echoed 1 into the various
> > > slots' power files.
> > > 
> > > Did you do that after modprobing acpiphp with debug=1?
> > > 
> > > If so, there should be debug output when you try and turn them
> > > on.
> > 
> > It produces:
> > 
> > acpiphp: enable_slot - physical_slot = 1
> > acpiphp_glue: acpiphp_enable_slot: Slot status is not ACPI_STA_ALL
> > acpiphp: enable_slot - physical_slot = 2
> > acpiphp_glue: acpiphp_enable_slot: Slot status is not ACPI_STA_ALL
> > acpiphp: enable_slot - physical_slot = 6
> > acpiphp_glue: acpiphp_enable_slot: Slot status is not ACPI_STA_ALL
> > acpiphp: enable_slot - physical_slot = 7
> > acpiphp_glue: acpiphp_enable_slot: Slot status is not ACPI_STA_ALL
> 
> Hm, so for some reason, firmware on your machine is telling us
> that it doesn't think cards are present and/or enabled.
> 
> Unfortunately, I don't know why your firmware would be saying
> that. We could add some more debug printks to see what firmware
> thinks about your system... Or we could just wait and see what
> happens after you get your hardware replaced.

New board, the exact same thing happens.

> > I have a card in one of the slots only this time.
> > 
> > > Also, quick dummy check, you are trying to power on populated
> > > slots, right? :)
> > 
> > Yes :-)
> > 
> > > Can you send the output of lspci -vv? And I like the output of
> > > lspci -vt as well... Both before and after loading acpiphp
> > > please.
> > 
> > Send privately.
> 
> No difference in before and after. Odd.
> 
> If you want to poke us again after your hardware swap, please do
> so. Sorry for being not so helpful. :-/

Poke :-)

One more thing I tried was pushing the power button on the slot
manually. With acpiphp, I get the same messages as above. Using pciehp,
I get the same power fault bit interrupt storm. So no difference from
using the sysfs interface or doing it on the box side, doesn't work
either way.

-- 
Jens Axboe

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