linux-kernel - Re: pci-express hotplug

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Date:	Tue, 27 Oct 2009 15:31:53 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Alex Chiang <achiang@...com>, 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

Jens Axboe wrote:
> 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.
> 

I'd like to confirm power fault interrupt storm, just in case.
Could you get /proc/interrupts information after power fault
problem happens and send it to me?

Thanks,
Kenji Kaneshige



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