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

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Message-ID: <CADnq5_PEBzxO7MVxV3q4Jy3uZNTfKWXo-gsvZQA8BdTMOSPjmw@mail.gmail.com>
Date:   Fri, 25 Nov 2016 18:41:21 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     Serguei Sagalovitch <serguei.sagalovitch@....com>,
        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 2:34 PM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
> 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 :)
>

Blame 32 bit systems and GPUs with tons of vram :)

I think resizable bars are finally coming in a useful way so this
should go away soon.

Alex