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

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Message-ID: <26f86650-5302-0df2-9b51-dd967f3e5a7b@amd.com>
Date:   Thu, 5 Jan 2017 19:41:26 -0500
From:   Serguei Sagalovitch <serguei.sagalovitch@....com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Jerome Glisse <jglisse@...hat.com>
CC:     Jerome Glisse <j.glisse@...il.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        "'linux-rdma@...r.kernel.org'" <linux-rdma@...r.kernel.org>,
        "'linux-nvdimm@...ts.01.org'" <linux-nvdimm@...1.01.org>,
        "'Linux-media@...r.kernel.org'" <Linux-media@...r.kernel.org>,
        "'dri-devel@...ts.freedesktop.org'" <dri-devel@...ts.freedesktop.org>,
        "'linux-pci@...r.kernel.org'" <linux-pci@...r.kernel.org>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        "Blinzer, Paul" <Paul.Blinzer@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "Sander, Ben" <ben.sander@....com>, <hch@...radead.org>,
        <david1.zhou@....com>, <qiang.yu@....com>
Subject: Re: Enabling peer to peer device transactions for PCIe devices

On 2017-01-05 07:30 PM, Jason Gunthorpe wrote:
> ........ but I am opposed to
> the idea we need two API paths that the *driver* has to figure out.
> That is fundamentally not what I want as a driver developer.
>
> Give me a common API to convert '__user *' to a scatter list and pin
> the pages.
Completely agreed. IMHO there is no sense to duplicate the same logic
everywhere as well as  trying to find places where it is missing.

Sincerely yours,
Serguei Sagalovitch