linux-kernel - Re: [PATCH 00/12] Recover sysfb after DRM probe failure

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Message-ID: <aWkWSnJ7Xn6ukW-b@sirius.home.kraxel.org>
Date: Thu, 15 Jan 2026 17:36:43 +0100
From: Gerd Hoffmann <kraxel@...hat.com>
To: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: Christian König <christian.koenig@....com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Zack Rusin <zack.rusin@...adcom.com>, 
	dri-devel@...ts.freedesktop.org, Alex Deucher <alexander.deucher@....com>, 
	amd-gfx@...ts.freedesktop.org, Ard Biesheuvel <ardb@...nel.org>, Ce Sun <cesun102@....com>, 
	Chia-I Wu <olvaffe@...il.com>, Danilo Krummrich <dakr@...nel.org>, 
	Dave Airlie <airlied@...hat.com>, Deepak Rawat <drawat.floss@...il.com>, 
	Dmitry Osipenko <dmitry.osipenko@...labora.com>, Gurchetan Singh <gurchetansingh@...omium.org>, 
	Hans de Goede <hansg@...nel.org>, Hawking Zhang <Hawking.Zhang@....com>, 
	Helge Deller <deller@....de>, intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org, 
	Jani Nikula <jani.nikula@...ux.intel.com>, Javier Martinez Canillas <javierm@...hat.com>, 
	Jocelyn Falempe <jfalempe@...hat.com>, Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, 
	Lijo Lazar <lijo.lazar@....com>, linux-efi@...r.kernel.org, linux-fbdev@...r.kernel.org, 
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Lucas De Marchi <lucas.demarchi@...el.com>, Lyude Paul <lyude@...hat.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, "Mario Limonciello (AMD)" <superm1@...nel.org>, 
	Mario Limonciello <mario.limonciello@....com>, Maxime Ripard <mripard@...nel.org>, 
	nouveau@...ts.freedesktop.org, Rodrigo Vivi <rodrigo.vivi@...el.com>, 
	Simona Vetter <simona@...ll.ch>, spice-devel@...ts.freedesktop.org, 
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>, Timur Kristóf <timur.kristof@...il.com>, 
	Tvrtko Ursulin <tursulin@...ulin.net>, virtualization@...ts.linux.dev, 
	Vitaly Prosyak <vitaly.prosyak@....com>
Subject: Re: [PATCH 00/12] Recover sysfb after DRM probe failure

  Hi,

> > At least for AMD GPUs remove_conflicting_devices() really early is
> > necessary because otherwise some operations just result in a
> > spontaneous system reboot.	

> It's similar for Intel. For us VGA emulation won't be used for EFI
> boot, but we still can't have the previous driver poking around in
> memory while the real driver is initializing. The entire memory layout
> may get completely shuffled so there's no telling where such memory
> accesses would land.

Can you do stuff like checking which firmware is needed and whenever
that can be loaded from the filesystem before calling
remove_conflicting_devices() ?

take care,
  Gerd