linux-kernel - Re: [PATCH RFC v2 00/16] drm/vkms: ConfigFS interface

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Message-ID: <Z0DC8nd1ZFN4A82-@louis-chauvet-laptop>
Date: Fri, 22 Nov 2024 18:44:18 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
	Melissa Wen <melissa.srw@...il.com>,
	Maíra Canal <mairacanal@...eup.net>,
	Haneen Mohammed <hamohammed.sa@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Simona Vetter <simona.vetter@...ll.ch>
Cc: jose.exposito89@...il.com, dri-devel@...ts.freedesktop.org,
	arthurgrillo@...eup.net, linux-kernel@...r.kernel.org,
	jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com,
	thomas.petazzoni@...tlin.com, seanpaul@...gle.com,
	nicolejadeyee@...gle.com
Subject: Re: [PATCH RFC v2 00/16] drm/vkms: ConfigFS interface

On 22/11/24 - 18:38, Louis Chauvet wrote:
> VKMS is manly used to test userspace program and its behavior. The current 
> implementation is not very configurable as you can only have one device, 
> with few specific planes.
> 
> This series aims to introduce a new interface, using ConfigFS, to create 
> and configure more devices. This will introduce:
> - Device creation
> - Plane creation
> - Plane configuration (type, color encoding, color range, rotations)
> - Encoder creation
> - CRTC creation
> - Linking between CRTC and planes/encoders
> 
> The proposition is:
> /config/vkms
> 	DEVICE_1
> 	┣━ enable
> 	┣━ writeback
> 	┣━ planes
> 	┃  ┣━ PLANE_1
> 	┃  ┃  ┣━ type
> 	┃  ┃  ┣━ supported_rotations
> 	┃  ┃  ┣━ color_range
> 	┃  ┃  ┣━ color_encoding
> 	┃  ┃  ┣━ default_color_encoding
> 	┃  ┃  ┣━ default_rotations
> 	┃  ┃  ┣━ default_color_range
> 	┃  ┃  ┗━ possible_crtcs
> 	┃  ┃     ┗━ >> /config/vkms/DEVICE_1/crtc/CRTC_1 
> 	┃  ┣━ PLANE_2
> 	┃  ┃  ┗━ ditto
> 	┃  ┗━ PLANE_3
> 	┃     ┗━ ditto
> 	┃
> 	┣━ encoders
> 	┃  ┣━ ENCODER_1
> 	┃  ┃  ┗━ possible_crtcs
> 	┃  ┃     ┗━ >> /config/vkms/DEVICE_1/crtc/CRTC_1
> 	┃  ┗━ ENCODER_2
> 	┃     ┗━ ditto
> 	┃
> 	┗━ crtc
> 	   ┗━ CRTC_1
> 	
> This interface aims to be extendable (new property can easly be added in 
> objects) and easy to use (objects are created simply by creating folders, 
> and configured by writing files).
> 
> This series depends on 
> https://lore.kernel.org/all/20241122-google-remove-crtc-index-from-parameter-v2-0-81540742535a@bootlin.com
> but as this is a bit complex to rebase, you can find a working branch 
> here:
> https://gitlab.freedesktop.org/louischauvet/kernel/-/tree/b4/vkms-configfs
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>

Hi all,

I am also currently working on MST emulation for VKMS. If someone can read 
what I already did and at tell me if my implementation seems on the right 
track it could be nice.

The current status is not very advanced: I can emulate a mst HUB, but not 
a screen. I am currently working on properly emulating the HUB by using an 
other hub.

You can find the branch for this work here:
https://gitlab.freedesktop.org/louischauvet/kernel/-/tree/b4/vkms-mst

Thanks a lot,
Louis Chauvet