linux-kernel - Re: PCIe Hotplugging not working

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Date:	Sat, 10 Dec 2011 14:36:00 -0500
From:	"John Stoffel" <john@...ffel.org>
To:	Greg KH <greg@...ah.com>
Cc:	Anand Kanaginhal <anand_dk@...mail.com>, mjg59@...f.ucam.org,
	bhelgaas@...gle.com, 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

>>>>> "Greg" == Greg KH <greg@...ah.com> writes:

Greg> On Fri, Dec 09, 2011 at 01:17:53PM -0800, Anand Kanaginhal wrote:
>> 
>> 
>> > Date: Fri, 9 Dec 2011 10:07:08 -0800
>> > From: greg@...ah.com
>> > To: anand_dk@...mail.com
>> > CC: mjg59@...f.ucam.org; bhelgaas@...gle.com; linux-pci@...r.kernel.org;
>> linux-kernel@...r.kernel.org; linux-hotplug@...r.kernel.org
>> > Subject: Re: PCIe Hotplugging not working
>> >
>> > On Fri, Dec 09, 2011 at 09:19:39AM -0800, Anand Kanaginhal wrote:
>> > > 1. With the above setup, If I hotplug card c1 and/or c2, will my driver
>> probe
>> > > get invoked.
>> >
>> > Stop right here. Please get your pci hotplug controller driver working
>> > first, for your platform. That seems to be the problem. After that,
>> > the rest of your questions should just resolve themselves.
>> Thank you Greg for your assistance, perhaps it would be little more helpful, if
>> you could tell me the basis on which you drew the conclusion. I am no kernel
>> expert :( 

Greg> As your driver's callbacks aren't being called, that's probably why this
Greg> isn't working.

Greg> Please make sure your pci hotplug driver is working first.  Try turning
Greg> on and off the power to the card slot (in the sysfs directory for the
Greg> slot) and see if that's working.

Greg> You also have failed to say exactly what pci hotplug controller
Greg> you have in your system, what is it?  You have to have one, and
Greg> the driver loaded for it, for any of this to work at all.

And it would make sense to test your hotplug setup with a known
working card that *does* support hotplugging properly already.  Then
you know your setup works and you can then concentrate on getting your
new card working.  

John
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