linux-kernel - Re: [PATH 0/4] [RFC] Support virtual DRM

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Date:   Tue, 22 Jun 2021 08:04:53 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Tomohito Esaki <etom@...l.co.jp>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATH 0/4] [RFC] Support virtual DRM

On Monday, June 21st, 2021 at 08:43, Tomohito Esaki <etom@...l.co.jp> wrote:

> Virtual DRM splits the overlay planes of a display controller into multiple
> virtual devices to allow each plane to be accessed by each process.
> This makes it possible to overlay images output from multiple processes on a
> display. For example, one process displays the camera image without compositor
> while another process overlays the UI.

Updating the KMS state from multiple processes doesn't sound like a
good idea. This opens up synchronization and global device limits
issues.

Are you aware of DRM leasing?