linux-kernel - Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB

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Message-ID: <608840df-85a6-6d3b-70b4-43b037db58c9@deltatee.com>
Date:   Mon, 5 Mar 2018 13:16:52 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Jason Gunthorpe <jgg@...lanox.com>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        linux-rdma@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Keith Busch <keith.busch@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the
 CMB



On 05/03/18 01:10 PM, Jason Gunthorpe wrote:
> So when reading the above mlx code, we see the first wmb() being used
> to ensure that CPU stores to cachable memory are visible to the DMA
> triggered by the doorbell ring.

Oh, yes, that makes sense. Disregard my previous email as I was wrong.

Logan