linux-kernel - [PATCH 0/4] drm/panic: Add a qr

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Message-ID: <20240703154309.426867-1-jfalempe@redhat.com>
Date: Wed,  3 Jul 2024 17:33:57 +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>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	"Bjorn Roy Baron" <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...hat.com>
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Subject: [PATCH 0/4] drm/panic: Add a qr_code panic screen

This series adds a new panic screen, with the kmsg data embedded in a QR-code.

The main advantage of QR-code, is that you can copy/paste the debug data to a bug report.

The QR-code encoder is written in rust, and is very specific to drm_panic.
The reason is that it is called in a panic handler, and thus can't allocate memory, or use locking.
The rust code uses a few rust core API, and provides only two C entry points.
There is no particular reason to do it in rust, I just wanted to learn rust, and see if it can work in the kernel.

If you want to see what it looks like, I've put a few screenshots here:
https://github.com/kdj0c/panic_report/issues/1

-- 

Jocelyn


Jocelyn Falempe (4):
  drm/panic: Add integer scaling to blit()
  drm/rect: add drm_rect_overlap()
  drm/panic: simplify logo handling
  drm/panic: Add a qr_code panic screen

 drivers/gpu/drm/Kconfig         |  29 +
 drivers/gpu/drm/Makefile        |   1 +
 drivers/gpu/drm/drm_drv.c       |   3 +
 drivers/gpu/drm/drm_panic.c     | 338 +++++++++--
 drivers/gpu/drm/drm_panic_qr.rs | 989 ++++++++++++++++++++++++++++++++
 include/drm/drm_panic.h         |   4 +
 include/drm/drm_rect.h          |  15 +
 7 files changed, 1340 insertions(+), 39 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_panic_qr.rs


base-commit: 3f5ea7ed705e8effe9cfabf912e769ccb6b7d389
-- 
2.45.2