linux-kernel - Re: [PATCH v6] Add udmabuf misc device

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Date:   Wed, 4 Jul 2018 10:08:07 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jonathan Corbet <corbet@....net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Shuah Khan <shuah@...nel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v6] Add udmabuf misc device

On Wed, Jul 04, 2018 at 07:53:38AM +0200, Gerd Hoffmann wrote:
> On Tue, Jul 03, 2018 at 10:37:57AM +0200, Daniel Vetter wrote:
> > On Tue, Jul 03, 2018 at 09:53:58AM +0200, Gerd Hoffmann wrote:
> > > A driver to let userspace turn memfd regions into dma-bufs.
> > > 
> > > Use case:  Allows qemu create dmabufs for the vga framebuffer or
> > > virtio-gpu ressources.  Then they can be passed around to display
> > > those guest things on the host.  To spice client for classic full
> > > framebuffer display, and hopefully some day to wayland server for
> > > seamless guest window display.
> > > 
> > > qemu test branch:
> > >   https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf
> > > 
> > > Cc: David Airlie <airlied@...ux.ie>
> > > Cc: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> > > Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > > Cc: Daniel Vetter <daniel@...ll.ch>
> > > Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> > 
> > I think some ack for a 2nd use-case, like virtio-wl or whatever would be
> > really cool. To give us some assurance that this is generically useful.
> 
> Tomeu?  Laurent?
> 
> > Plus an ack from dma-buf folks (nag them on irc, you don't have them on Cc
> > here).
> 
> Hmm, does MAINTAINERS need an update then?  Maintainer and mailing lists
> listed in the "DMA BUFFER SHARING FRAMEWORK" entry are on Cc.

Yeah, maintainers entry with you as maintainer plus dri-devel as mailing
list plus drm-misc as repo would be good. Just grep for drm-misc.git for
tons of examples.

> Who should be Cc'ed?

dim add-missing-cc ftw :-)

Cheers, Daniel
> 
> > Then this is imo good to go.
> > 
> > I assume you'll push it to drm-misc, like all the other dma-buf stuff?
> 
> Can do that, sure, after collecting the acks ...
> 
> thanks,
>   Gerd
> 
> --
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch