linux-kernel - Re: PCIe can not rescan for new PCIe device ( FPGA board )

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Date:	Wed, 12 Oct 2011 15:36:41 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Abdelghani Ouchabane <abdelghani@...no.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: PCIe can not rescan for new PCIe device ( FPGA board )

Hello,

According to your dmesg output, pciehp driver doesn't detect any PCIe
hotplug slot. Can you send the following information?

 - ls -lR /sys/bus/pci/slots
 - lspci -vvvv (as root user)

Regards,
Kenji Kaneshige


(2011/10/11 17:11), Abdelghani Ouchabane wrote:
> 
>>>> After I plug my board in, I executed echo 1> /sys/bus/pci/rescan
>>>
>>>
>>
>> Can you try echo 1 > /sys/bus/pci/slots/XXX/power?
>> (XXX: slot number)
> Hallo Kenji,
> 
> I am still having the same problem after executing "echo 1 > /sys/bus/pci/slots/0000\:02\:00.0/power"
> 
>>
>>> It seems like a pciehp bug that you have to rescan explicitly. But
>>> I'm not a pciehp expert and I haven't looked at the code.
>>
>> The pciehp automatically scans the bus on presence changed event
>> (e.g. board is pluged in) if the hot-plug controller supports
>> surprise removal. Otherwise, you need to power on slot explicitly
>> by "echo 1 > /sys/bus/pci/slots/XXX/power". So one possibility is
>> that your controller doesn't support surprise removal. We can
>> check it by looking at the pciehp's debug output. Can you send
>> whole dmesg output?
> 
> I attached to you the whole dmesg log.
> 
> Cheers,
> Ghani
> 
> 

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