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

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Message-ID: <df3b1122-1c05-4bd5-bbbd-2e7cff2934aa@redhat.com>
Date: Thu, 4 Jul 2024 11:29:41 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: 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>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, rust-for-linux@...r.kernel.org,
 Danilo Krummrich <dakr@...hat.com>
Subject: Re: [PATCH 0/4] drm/panic: Add a qr_code panic screen



On 04/07/2024 11:18, Alice Ryhl wrote:
> On Wed, Jul 3, 2024 at 5:44 PM Jocelyn Falempe <jfalempe@...hat.com> wrote:
>>
>> 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
> 
> I tried to apply this patch, but I can't find this commit, nor could I
> find any tag that it applies on.

Sorry, it's the drm-misc-next branch of 
git@...lab.freedesktop.org:drm/misc/kernel.git

> 
> Alice
>