linux-kernel - [PATCH 0/3] drm/panic: Remove build time dependency with FRAMEBUFFER

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Message-ID: <20240717090102.968152-1-jfalempe@redhat.com>
Date: Wed, 17 Jul 2024 10:48:38 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Helge Deller <deller@....de>,
	"Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Jocelyn Falempe <jfalempe@...hat.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org
Subject: [PATCH 0/3] drm/panic: Remove build time dependency with FRAMEBUFFER_CONSOLE

When proposing to enable DRM_PANIC on Fedora, some users raised concern about the need to disable VT_CONSOLE.
So this is my new attempt to avoid fbcon/vt_console to overwrite the panic screen.
This time it doesn't involve any locking, so it should be safe.
I added a skip_panic option in struct fb_info, and check if this option and the panic_cpu are set in fb_is_inactive(), to prevent any framebuffer operation.
Also skip_panic is only true if the drm driver supports drm_panic, so you will still get the VT panic info on drivers that don't have drm_panic support yet.

Jocelyn Falempe (3):
  drm/panic: Add drm_panic_is_enabled()
  fbcon: Add an option to disable fbcon in panic.
  drm/panic: Remove build time dependency with FRAMEBUFFER_CONSOLE

 drivers/gpu/drm/Kconfig          |  2 +-
 drivers/gpu/drm/drm_fb_helper.c  |  2 ++
 drivers/gpu/drm/drm_panic.c      | 20 ++++++++++++++++++++
 drivers/video/fbdev/core/fbcon.c |  7 ++++++-
 include/drm/drm_panic.h          |  2 ++
 include/linux/fb.h               |  1 +
 6 files changed, 32 insertions(+), 2 deletions(-)

base-commit: a237f217bad50c381773da5b00442710d1449098
-- 
2.45.2