linux-kernel - Re: Enabling peer to peer device transactions for PCIe devices

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Message-ID: <20161125193410.GD16504@obsidianresearch.com>
Date:   Fri, 25 Nov 2016 12:34:10 -0700
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Serguei Sagalovitch <serguei.sagalovitch@....com>
Cc:     Christian König <christian.koenig@....com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        "Bridgman, John" <John.Bridgman@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "Sander, Ben" <ben.sander@....com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "Blinzer, Paul" <Paul.Blinzer@....com>,
        "Linux-media@...r.kernel.org" <Linux-media@...r.kernel.org>,
        Haggai Eran <haggaie@...lanox.com>
Subject: Re: Enabling peer to peer device transactions for PCIe devices

On Fri, Nov 25, 2016 at 12:16:30PM -0500, Serguei Sagalovitch wrote:

> b) Allocation may not  have CPU address  at all - only GPU one.

But you don't expect RDMA to work in the case, right?

GPU people need to stop doing this windowed memory stuff :)

Jason