linux-kernel - Re: [PATCH v5 06/13] PCI/P2PDMA: Add P2P DMA driver writer's documentation

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Date:   Fri, 31 Aug 2018 09:44:53 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Randy Dunlap <rdunlap@...radead.org>, 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
Cc:     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>,
        Christian König <christian.koenig@....com>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v5 06/13] PCI/P2PDMA: Add P2P DMA driver writer's
 documentation

Hey,

Thanks for the review. I'll make the fixes for the next version.

On 30/08/18 06:34 PM, Randy Dunlap wrote:
>> +With the client list in hand, the orchestrator may then call> +:c:func:`pci_p2pmem_find()` to obtain a published P2P memory provider
>> +that is supported (behind the same root port) as all the clients. If more
>> +than one provider is supported, the one nearest to all the clients will
>> +be chosen first. If there are more than one provider is an equal distance
>> +away, the one returned will be chosen at random. This function returns the PCI
> 
> random or just arbitrarily?

Randomly. See pci_p2pmem_find() in patch 1. We use prandom_u32_max() to
select any of the supported devices.

Logan