From patchwork Tue Feb 27 10:04:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jocelyn Falempe X-Patchwork-Id: 13573447 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 C836AC5478C for ; Tue, 27 Feb 2024 10:05:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CBCE910E8E0; Tue, 27 Feb 2024 10:05:33 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="Y1cvDceZ"; 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 01E6A10E8E0 for ; Tue, 27 Feb 2024 10:05:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709028331; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WEqff19JHcsYm0iDiR6uIGeiIJlWi/YnRL1Hddn3yS4=; b=Y1cvDceZ6ONZ3kkfdoJ9tD+nKmEXKrEMhaq2cnjwuwxQ00WnbqYFXQBmwnQtvQO71xeUB1 uPzFbe0TI7wEiFOT3hR/+JaDJnoEp0n8seqGP1NLoslEazFRyEAVQ9K6Pp7bLbuFn+WlmD BUvROqL6mNLoAPo3wRZE/rjMd1VuXxE= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-325-ihR4dhHmMuasOqY9G-rbYg-1; Tue, 27 Feb 2024 05:05:27 -0500 X-MC-Unique: ihR4dhHmMuasOqY9G-rbYg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 672A71C06902; Tue, 27 Feb 2024 10:05:27 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.39.192.179]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9445723CEF; Tue, 27 Feb 2024 10:05:22 +0000 (UTC) From: Jocelyn Falempe To: dri-devel@lists.freedesktop.org, tzimmermann@suse.de, airlied@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, daniel@ffwll.ch, javierm@redhat.com, bluescreen_avenger@verizon.net, noralf@tronnes.org Cc: gpiccoli@igalia.com, Jocelyn Falempe Subject: [RFC][PATCH v8 0/8] drm/panic: Add a drm panic handler Date: Tue, 27 Feb 2024 11:04:11 +0100 Message-ID: <20240227100459.194478-1-jfalempe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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 introduces a new drm panic handler, which displays a message when a panic occurs. So when fbcon is disabled, you can still see a kernel panic. This is one of the missing feature, when disabling VT/fbcon in the kernel: https://www.reddit.com/r/linux/comments/10eccv9/config_vtn_in_2023/ Fbcon can be replaced by a userspace kms console, but the panic screen must be done in the kernel. This is a proof of concept, and works with simpledrm, mgag200, ast, and imx. To test it, make sure you're using one of the supported driver, and trigger a panic: echo c > /proc/sysrq-trigger or you can enable CONFIG_DRM_PANIC_DEBUG and echo 1 > /sys/kernel/debug/drm_panic/trigger v2: * Use get_scanout_buffer() instead of the drm client API. (Thomas Zimmermann) * Add the panic reason to the panic message (Nerdopolis) * Add an exclamation mark (Nerdopolis) v3: * Rework the drawing functions, to write the pixels line by line and to use the drm conversion helper to support other formats. (Thomas Zimmermann) v4: * Fully support all simpledrm formats using drm conversion helpers * Rename dpanic_* to drm_panic_*, and have more coherent function name. (Thomas Zimmermann) * Use drm_fb_r1_to_32bit for fonts (Thomas Zimmermann) * Remove the default y to DRM_PANIC config option (Thomas Zimmermann) * Add foreground/background color config option * Fix the bottom lines not painted if the framebuffer height is not a multiple of the font height. * Automatically register the driver to drm_panic, if the function get_scanout_buffer() exists. (Thomas Zimmermann) * Add mgag200 support. v5: * Change the drawing API, use drm_fb_blit_from_r1() to draw the font. (Thomas Zimmermann) * Also add drm_fb_fill() to fill area with background color. * Add draw_pixel_xy() API for drivers that can't provide a linear buffer. * Add a flush() callback for drivers that needs to synchronize the buffer. * Add a void *private field, so drivers can pass private data to draw_pixel_xy() and flush(). * Add ast support. * Add experimental imx/ipuv3 support, to test on an ARM hw. (Maxime Ripard) v6: * Fix sparse and __le32 warnings * Drop the IMX/IPUV3 experiment, it was just to show that it works also on ARM devices. v7: * Add a check to see if the 4cc format is supported by drm_panic. * Add a drm/plane helper to loop over all visible primary buffer, simplifying the get_scanout_buffer implementations * Add a generic implementation for drivers that uses drm_fb_dma. (Maxime Ripard) * Add back the IMX/IPUV3 support, and use the generic implementation. (Maxime Ripard) v8: * Directly register each plane to the panic notifier (Sima) * Replace get_scanout_buffer() with set_scanout_buffer() to simplify the locking. (Thomas Zimmermann) * Add a debugfs entry, to trigger the drm_panic without a real panic (Sima) * Fix the drm_panic Documentation, and include it in drm-kms.rst Best regards, Jocelyn Falempe (8): drm/format-helper: Add drm_fb_blit_from_r1 and drm_fb_fill drm/panic: Add a drm panic handler drm/panic: Add debugfs entry to test without triggering panic. drm/fb_dma: Add generic set_scanout_buffer() for drm_panic drm/simpledrm: Add drm_panic support drm/mgag200: Add drm_panic support drm/imx: Add drm_panic support drm/ast: Add drm_panic support Documentation/gpu/drm-kms.rst | 12 + drivers/gpu/drm/Kconfig | 32 ++ drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/ast/ast_mode.c | 6 + drivers/gpu/drm/drm_fb_dma_helper.c | 37 ++ drivers/gpu/drm/drm_format_helper.c | 432 +++++++++++++++++---- drivers/gpu/drm/drm_panic.c | 447 ++++++++++++++++++++++ drivers/gpu/drm/drm_plane.c | 3 + drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c | 5 + drivers/gpu/drm/mgag200/mgag200_g200.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200eh.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200eh3.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200er.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200ev.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200ew3.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200se.c | 2 + drivers/gpu/drm/mgag200/mgag200_g200wb.c | 2 + drivers/gpu/drm/mgag200/mgag200_mode.c | 7 + drivers/gpu/drm/tiny/simpledrm.c | 17 + include/drm/drm_fb_dma_helper.h | 4 + include/drm/drm_format_helper.h | 9 + include/drm/drm_modeset_helper_vtables.h | 11 + include/drm/drm_panic.h | 37 ++ include/drm/drm_plane.h | 17 + 24 files changed, 1012 insertions(+), 81 deletions(-) create mode 100644 drivers/gpu/drm/drm_panic.c create mode 100644 include/drm/drm_panic.h base-commit: bfa4437fd3938ae2e186e7664b2db65bb8775670