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

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Date:	Fri, 14 Oct 2011 11:40:12 +0200
From:	Abdelghani Ouchabane <abdelghani@...no.com>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.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 )

On 13/10/11 14:50, Kenji Kaneshige wrote:
> Thank you for the information. Though I don't have any good news for you,
> I think as follows based on the info.
>
> - There are two hot-plug capable PCIe slots on your machine.
>
> - But, it seems you are using fakephp driver, not pciehp (is that
>   correct?). The fakephp cannot handle hot-plug event such as presence
>   change event on the slot. This is why the bus is not scanned automatically.
>
> - Unfortunately, the bus would not be scanned automatically even if you
>   use pciehp. As I told you in the previous email, current pciehp don't
>   scan the bus automatically only if the slot is hot-plug surprise
>   capable. According to the lspci output, your hotplug controller is not
>   hot-plug surprise capable.
>
> - I don't think pciehp solve invalid register read problem. According to
>   the lspci output, power controller capability isn't present on your
>   hotplug controller. On such environment, pciehp driver does almost the
>   same thing as fakephp does (just scan the bus/remove the pci device data
>   structure) except hot-plug event handling.
>
> But it's worth whole trying pciehp.
> By the way, have you tried acpiphp? It might help you.
>
> Regards,
> Kenji Kaneshige
>

Hallo Kenji,

many thanks for your great supports. The new BIOS from Congatec solves
the problem.

I using both fakephp & pciehp drivers, Can I use both drivers at the
same time?

I am using fakephp because I need "/sys/bus/pci/slots/0000\:02\:00.0/power".

Other thing: my Kernel has "CONFIG_ACPI_PROC_EVENT is not set", does
this explain why the scan is not performed automatically?

[root@...alhost ~]# modprobe acpiphp
FATAL: Error inserting acpiphp
(/lib/modules/2.6.40.3-0.119.delos.i686/kernel/drivers/pci/hotplug/acpiphp.ko):
No such device

What is the advantage to use acpiphp ?


Cheers,
Ghani





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