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Date: Wed, 18 Feb 2015 09:26:15 +1100
From: Gavin Shan <gwshan@linux.vnet.ibm.com>
To: Stewart Smith <stewart@linux.vnet.ibm.com>
Subject: Re: [PATCH RESEND v2 0/7] powerpc/powernv: Unified PCI slot reset
 and hotplug
Message-ID: <20150217222615.GA6454@shangw>
Reply-To: Gavin Shan <gwshan@linux.vnet.ibm.com>
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Cc: bhelgaas@google.com, linuxppc-dev@ozlabs.org,
 Gavin Shan <gwshan@linux.vnet.ibm.com>, linux-pci@vger.kernel.org
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On Wed, Feb 18, 2015 at 08:44:19AM +1100, Stewart Smith wrote:
>Gavin Shan <gwshan@linux.vnet.ibm.com> writes:
>
>> The patchset was built based on patchset "powerpc/powernv: Simplify EEH
>> implementation", which can be found from:
>>
>> https://patchwork.ozlabs.org/patch/439956/
>>
>> The patchset corresponds to skiboot changes, which manages PCI slots
>> in a unified way: OPAL APIs used to do slot reset, power management,
>> presence status retrival. The patchset shouldn't be merged before
>> the OPAL firmware counterpart is merged:
>>
>> https://patchwork.ozlabs.org/patch/440463/
>
>But this patchset will work with old OPAL, right? We're not breaking
>compatibility with newer kernels (with this patchset) and older
>firmware?

Yes. With old OPAL, the reset stuff in Linux works as before and we
shouldn't see hotpluggable slots from /sys/bus/pci/slots.

The compatibility issue was pointed by Ben. It's something fixed by
this revision (v2).

Thanks,
Gavin