linux-kernel - Re: [RFC PATCH 00/17] VKMS: Add configfs support

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Message-ID: <CAPj87rP0HZzdVoH18O6gVe1n8cHjhNn2LFSAAVvqj5m6tN2y_w@mail.gmail.com>
Date: Wed, 14 Aug 2024 10:10:39 +0100
From: Daniel Stone <daniel@...ishbar.org>
To: José Expósito <jose.exposito89@...il.com>
Cc: rodrigosiqueiramelo@...il.com, melissa.srw@...il.com, 
	mairacanal@...eup.net, hamohammed.sa@...il.com, daniel@...ll.ch, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, 
	airlied@...il.com, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, louis.chauvet@...tlin.com
Subject: Re: [RFC PATCH 00/17] VKMS: Add configfs support

Hi José,

On Tue, 13 Aug 2024 at 11:51, José Expósito <jose.exposito89@...il.com> wrote:
>  - When a CRTC is added and removed before device creation, there
>    is a vblank warning.
>    The issue is caused because vblanks are referenced using the
>    CRTC index but, because one of the CRTCs is removed, the
>    indices are not consecutives and drm_crtc_vblank_crtc() tries to
>    access and invalid index
>    I'm not sure if CRTC's indices *must* start at 0 and be
>    consecutives or if this is a bug in the drm_crtc_vblank_crtc()
>    implementation.

CRTCs and planes are not hotpluggable. I recommend you just create a
lot of each of them statically at startup, and hotplug only
connectors.

Cheers,
Daniel