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SubjectRe: [PATCH v6] Add udmabuf misc device
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On 07/04/2018 07:53 AM, 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@linux.ie>
>>> Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
>>> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>>> Cc: Daniel Vetter <daniel@ffwll.ch>
>>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.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?

Sorry, but I think I will need some help to understand how this could
help in the virtio-wl case [adding Zach Reizner to CC].

Any graphics buffers that are allocated with memfd will be shared with
the compositor via wl_shm, without need for dmabufs.

Daniel Stone [added to CC] commented though that this could be useful for
browsers that composite pages with a nested Wayland compositor, to avoid
having to blit each layer so that the EGL platform notifies the
compositor of new contents.

Cheers,

Tomeu

>> 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.
>
> Who should be Cc'ed?
>
>> 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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