From patchwork Wed Jul 3 15:33:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jocelyn Falempe X-Patchwork-Id: 13722486 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF3D9C2BD09 for ; Wed, 3 Jul 2024 15:44:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 77A0210E999; Wed, 3 Jul 2024 15:44:31 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="HClMsL6s"; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6BBE810E999 for ; Wed, 3 Jul 2024 15:44:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1720021469; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=s2erXypPFS96oGxgCOnNdx6e4GIHP7kCcJ5ryjq/x4k=; b=HClMsL6sSttiQZGf0IVEdsk0jWFQp7fONU7SE5mRK4gwSwycabMSzwPUgCnGG2EVLYIHsE k/XICJ5AxndLjtcUqttmzYqM5F7BHMD0V0VgBW4SqhWDao00ywMWKMEVA+M6uBVikOTn8p h1Sy5r7GjBt5Io2Adcp2hWILaqL4uxM= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-577-wbBm45VNMgidjIZZQ62NHw-1; Wed, 03 Jul 2024 11:44:26 -0400 X-MC-Unique: wbBm45VNMgidjIZZQ62NHw-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D06DE1954206; Wed, 3 Jul 2024 15:44:22 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.39.193.208]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 599BD1955BC0; Wed, 3 Jul 2024 15:44:17 +0000 (UTC) From: Jocelyn Falempe To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho , Boqun Feng , Gary Guo , "Bjorn Roy Baron" , Benno Lossin , Andreas Hindborg , Alice Ryhl , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, rust-for-linux@vger.kernel.org, Danilo Krummrich Cc: Jocelyn Falempe Subject: [PATCH 0/4] drm/panic: Add a qr_code panic screen Date: Wed, 3 Jul 2024 17:33:57 +0200 Message-ID: <20240703154309.426867-1-jfalempe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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