linux-kernel - Re: [PATCH 2/6] drm: Allow render nodes to query display objects

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Message-ID: <87infk5b7o.fsf@keithp.com>
Date:   Thu, 12 Oct 2017 14:04:59 -0700
From:   "Keith Packard" <keithp@...thp.com>
To:     Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        Dave Airlie <airlied@...hat.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/6] drm: Allow render nodes to query display objects

Daniel Vetter <daniel@...ll.ch> writes:

> One more that came up on irc after discussion why this is needed: The
> userspace side using this won't work on split gpus where the render node
> has 0 displays, and hence where you really need to query the compositor
> anyway.

Agreed -- using the X connection to get the information should let this
work on split systems. Within the Vulkan code, I already have to move
objects from the render node to the display node. Hrm. That exposes a
weakness in the kms_display extension I've proposed; that only allows
you to pass a single fd. Passing separate display and render fds through
that interface seems like a pretty useful change.

-- 
-keith

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