linux-kernel - Re: [PATCH v5 01/13] PCI/P2PDMA: Support peer-to-peer memory

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Message-ID: <20180901082703.GA670@lst.de>
Date:   Sat, 1 Sep 2018 10:27:03 +0200
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Christian König <christian.koenig@....com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v5 01/13] PCI/P2PDMA: Support peer-to-peer memory

On Fri, Aug 31, 2018 at 09:48:40AM -0600, Logan Gunthorpe wrote:
> Pretty easy. P2P detection is pretty much just pci_p2pdma_distance() ,
> which has nothing to do with the ZONE_DEVICE support.
> 
> (And the distance function makes use of a number of static functions
> which could be combined into a simpler interface, should we need it.)

I'd ѕay lets get things merged as-is, so that we can review the
non-ZONE_DEVICE users.  I'm a little curious how that is going to work,
so having it as a full series would be useful.