Message-ID: <4152E606.3070609@ppp0.net>
Date: Thu, 23 Sep 2004 17:04:38 +0200
From: Jan Dittmer <jdittmer@ppp0.net>
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To: Greg KH <greg@kroah.com>
CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Is there a user space pci rescan method?
References: <E8F8DBCB0468204E856114A2CD20741F2C13E2@mail.local.ActualitySystems.com> <415211A8.8040907@ppp0.net> <20040923002649.GA28259@kroah.com>
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Greg KH wrote:
> On Thu, Sep 23, 2004 at 01:58:32AM +0200, Jan Dittmer wrote:
> 
>>Dave Aubin wrote:
>>
>>>Hi,
>>>
>>>  I know very little about hotplug, but does make sense.
>>>How do you motivate a hotplug insertion event?  Or should
>>>I just go read the /docs on hotplugging?  Any help is
>>>Appreciated:)
>>
>>There is a "fake" hotplug driver which works for normal pci. But last
>>time I looked at it, it did only support hot disabling, not hot enabling
>>- but this surely can be fixed.
> 
> 
> Yes, hot "enabling" has been left for someone to add to the driver, if
> you read the comments in it :)
> 

I read them and started playing around with this driver. So echoing 0 in
 /sys/bus/pci/slots/*/power disables the pci device. The problem I see
is, that the tree with the device is disappearing. So how am I supposed
to re-enable the device. I've no real hotplug hardware to play with, so
I'm bound to reading the source code in drivers/pci/hotplug and testing
with fakephp. I found your utility pcihpview (v0.5) which searches for
/sys/bus/pci/hotplug_slots. But grepping the kernel tree doesn't show
any mentioning of it - so I suppose it is outdated.
Is there anywhere a current article (or Documentation/pci_hotplug.txt)
about the state of PCI hotplug and how this is supposed to work?

Thanks,

Jan

ps: Meanwhile I found dummyphp on the pcihpd mailinglist. This doesn't
remove the device from /sys/bus/pci/slots/*/power . Still I'd like
to know the offical way.
-
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