linux-kernel - Re: PCIe Hotplugging not working

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Message-ID: <4ED4F798.9020106@desy.de>
Date:	Tue, 29 Nov 2011 16:17:44 +0100
From:	Ludvig Petrossian <lyudvig.petrosyan@...y.de>
To:	Anand Kanaginhal <anand_dk@...mail.com>
CC:	Linux PCI mailing <linux-pci@...r.kernel.org>,
	linux kernel mailing <linux-kernel@...r.kernel.org>,
	linux hotplug mailing <linux-hotplug@...r.kernel.org>
Subject: Re: PCIe Hotplugging not working

On 29/11/11 12:56, Anand Kanaginhal wrote:
>
> I am trying to get PCIe endpoint hot - plugging working
>
> The Set up is such that there is one endpoint (our custom device) connected to PCI  switch PLX 8609 8 port 8 lane switch. 
> 1. I have my driver module compiled, copied into /lib/modules/`uname -r`/kernel/drivers/char/
> 2. I run depmod and "modules.pcimap" also got updated with my module. 
>
> However
>  if I unplug and plug in the endpoint, my driver .probe and .remove functions
>  are not being invoked. Is there something more to be done at the bus 
> level to get the driver to hot plug ?
>
> I have tried various kernel version, Currently I am trying on 2.6.38.12 (UBUNTU flavor).
> First is there anything missing ? Also Please give me some pointers and debug direction.
>
> Thanks
> Anand
>
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Hi Anand

Did You enable the pcie hotplug driver (pciehp)
One can do it adding the next options to the /boot/grub/menu.lst
pciehp.pciehp_force=1 pciehp.pciehp_debug=1
(example of my menu.lst: kernel        /boot/vmlinuz-2.6.32-28-generic
root=UUID=330631e1-99a3-46d3-bf52-f4ca23c6b6ef ro pciehp.pciehp_force=1
pciehp.pciehp_debug=1 acpi=off noapic console=tty0 console=ttyS0 quiet )

so You can see the pciehp outputs in /var/log/kern.log

regards

Ludwig
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