linux-kernel - Re: pci-express hotplug

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Date:	Wed, 28 Oct 2009 15:15:00 +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 27 2009, Kenji Kaneshige wrote:
>> 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?
> 
> The box pretty much hangs when I try to power on a slot with pciehp, so
> it's not easy to do... It doesn't hang with acpiphp, but doesn't work
> either (see previous reply to Alex).
> 

Could you try the attached debugging patch? With this patch, power
fault interrupt would be disabled after 100 power fault detected (
I hope so). You can get /proc/interrupts after that.

Thanks,
Kenji Kaneshige



View attachment "pciehp-power-fault-debug.patch" of type "text/plain" (1080 bytes)