linux-kernel - Re: [PATCH] Add option to passively listen for PCIE hotplug events

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Message-ID: <490FBD4E.2040308@jp.fujitsu.com>
Date:	Tue, 04 Nov 2008 12:11:10 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	linux-pci@...r.kernel.org, kristen.c.accardi@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add option to passively listen for PCIE hotplug events

Matthew Garrett wrote:
> On Tue, Nov 04, 2008 at 11:29:43AM +0900, Kenji Kaneshige wrote:
>> Matthew Garrett wrote:
>>> What do you mean by "not work properly"? The hardware we've tested with 
>>> fires events even without an OSHP method being present. That's the case 
>>> we're trying to deal with.
>>>
>> Because the explanation of PCI Express Native Hot Plug control bit in
>> _OSC return value in PCI firmware spec says
>>
>> "... If firmware allows the operating system control of this feature,
>> then in the context of the _OSC method, it must ensure that all hot
>> plug events are routed to device interrupts as described in the PCI
>> Express Base Specification. ..."
>>
>> My understanding is that it is not ensured that all hot plug events
>> are routed to device interrupts, if hotplug control is not granted.
> 
> My understanding is that in the worst case the hardware/firmware won't 
> give us any events - that's basically equivalent to not having the 
> driver loaded at all. On hardware that gives us the events anyway, we 
> get some extra functionality.
> 
> Thanks for the feedback!

Ok, I understood that my worries are already within the scope of the
assumption.

Thanks,
Kenji Kaneshige





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