linux-kernel - Re: [RFC PATCH v4 0/2] RDMA/rxe: Add dma-buf support

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Date:   Fri, 10 Dec 2021 20:29:24 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Zhu Yanjun <zyjzyj2000@...il.com>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Doug Ledford <dledford@...hat.com>,
        Jianxin Xiong <jianxin.xiong@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        Maor Gottlieb <maorg@...dia.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-media@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Damian Hobson-Garcia <dhobsong@...l.co.jp>,
        Takanari Hayama <taki@...l.co.jp>,
        Tomohito Esaki <etom@...l.co.jp>
Subject: Re: [RFC PATCH v4 0/2] RDMA/rxe: Add dma-buf support

Hi Jason,
Thank you for replying.

2021年12月8日(水) 2:14 Jason Gunthorpe <jgg@...pe.ca>:
>
> On Fri, Dec 03, 2021 at 12:51:44PM +0900, Shunsuke Mie wrote:
> > Hi maintainers,
> >
> > Could you please review this patch series?
>
> Why is it RFC?
>
> I'm confused why this is useful?
>
> This can't do copy from MMIO memory, so it shouldn't be compatible
> with things like Gaudi - does something prevent this?
I think if an export of the dma-buf supports vmap, CPU is able to access the
mmio memory.

Is it wrong? If this is wrong, there is no advantages this changes..
>
> Jason

Regards,
Shunsuke