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SubjectRe: [PATCH 2/8] PCI: Add pci_find_common_upstream_dev()
Am 28.03.2018 um 17:47 schrieb Logan Gunthorpe:
> On 28/03/18 09:07 AM, Christian König wrote:
>> Am 28.03.2018 um 14:38 schrieb Christoph Hellwig:
>>> On Sun, Mar 25, 2018 at 12:59:54PM +0200, Christian König wrote:
>>>> From: "" <>
>>>> Add an interface to find the first device which is upstream of both
>>>> devices.
>>> Please work with Logan and base this on top of the outstanding peer
>>> to peer patchset.
>> Can you point me to that? The last code I could find about that was from
>> 2015.
> The latest posted series is here:
> However, we've made some significant changes to the area that's similar
> to what you are doing. You can find lasted un-posted here:
> Specifically this function would be of interest to you:
> However, the difference between what we are doing is that we are
> interested in the distance through the common upstream device and you
> appear to be finding the actual common device.

Yeah, that looks very similar to what I picked up from the older
patches, going to read up on that after my vacation.

Just in general why are you interested in the "distance" of the devices?

And BTW: At least for writes that Peer 2 Peer transactions between
different root complexes work is actually more common than the other way

So I'm a bit torn between using a blacklist or a whitelist. A whitelist
is certainly more conservative approach, but that could get a bit long.


> Thanks,
> Logan

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