linux-kernel - Re: [PATCH v6 07/13] block: Add PCI P2P flag for request queue and check support for requests

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Date:   Thu, 13 Sep 2018 10:14:02 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Jens Axboe <axboe@...nel.dk>, 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>
Subject: Re: [PATCH v6 07/13] block: Add PCI P2P flag for request queue and
 check support for requests



On 12/09/18 06:28 PM, Jens Axboe wrote:
> On 9/12/18 6:11 PM, Logan Gunthorpe wrote:
>> QUEUE_FLAG_PCI_P2P is introduced meaning a driver's request queue
>> supports targeting P2P memory.
>>
>> When a request is submitted we check if PCI P2PDMA memory is assigned
>> to the first page in the bio. If it is, we ensure the queue it's
>> submitted to supports it, and enforce REQ_NOMERGE.
> 
> This changelog is no longer accurate.


Oops, I'll fix this for v7.

Thanks,

Logan