linux-kernel - Re: [PATCH v2 4/4] drm/panic: Add a qr

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Message-ID: <acd5c505-f058-46e7-9d92-620dea41d707@redhat.com>
Date: Tue, 9 Jul 2024 12:04:02 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Greg KH <gregkh@...uxfoundation.org>
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>, 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>
Subject: Re: [PATCH v2 4/4] drm/panic: Add a qr_code panic screen



On 09/07/2024 11:12, Greg KH wrote:
> On Tue, Jul 09, 2024 at 11:11:35AM +0200, Greg KH wrote:
>> On Tue, Jul 09, 2024 at 10:40:10AM +0200, Jocelyn Falempe wrote:
>>> +config DRM_PANIC_SCREEN_QR_CODE_URL
>>> +	string "Base url of the QR code in the panic screen"
>>> +	depends on DRM_PANIC_SCREEN_QR_CODE
>>> +	help
>>> +	  This option sets the base url to report the kernel panic. If it's set
>>> +	  the qr code will contain the url and the kmsg compressed with zlib as
>>> +	  url parameter. If it's empty, the qr code will contain the kmsg as
>>> +	  uncompressed text only.
>>
>> meta-comment, should we by default do this on a kernel.org domain so
>> that no specific distro has to worry about hosing this type of web
>> service?
> 
> Also, do you have the backend source for this to show how anyone can
> host it themselves as well?  We can't add features to the kernel that no
> one but closed-source implementations will use for obvious reasons.

I've made a proof of concept backend here:
https://github.com/kdj0c/panic_report/

And the javascript to decode the kmsg trace is here (under MIT licence):
https://github.com/kdj0c/panic_report/blob/main/docs/panic_report.js

It uses the pako js library to uncompress the zlib data, which is also 
under MIT/Zlib licence https://github.com/nodeca/pako/

If kernel.org want to host a default service for that, that would be 
great. It can be linked with https://bugzilla.kernel.org to easily 
create a bug, or look for similar bugs.


Best regards,

-- 

Jocelyn


> 
> thanks,
> 
> greg k-h
>