From patchwork Wed Jan 19 10:29:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jocelyn Falempe X-Patchwork-Id: 12717442 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 58497C433F5 for ; Wed, 19 Jan 2022 10:30:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4622210EF44; Wed, 19 Jan 2022 10:30:13 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1A40A10EF44 for ; Wed, 19 Jan 2022 10:30:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1642588211; 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: in-reply-to:in-reply-to:references:references; bh=b1u3aFt23Q8cXZP69tEtyJ6IQ7TUp089FnaGsa9cy9s=; b=JwbkQy+l27jokpnCj9OGVQw5EhVSq+tH/uiIRvgreBE5iex0Kga6s0dte/LeIVcfW9ytlD Q4BOQhBmjTJt3GfESFEa8eqXNKHgxM4ZyixONG2QfTI7yP4gMWO3DrWz2mwLV9/PTZdoeR 87MDdohwUBK2Hu8IEXJAT0bifSLMIb8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-416-2tAzsSr3M3K00THrb2n5LA-1; Wed, 19 Jan 2022 05:30:08 -0500 X-MC-Unique: 2tAzsSr3M3K00THrb2n5LA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5AD26192AB6E; Wed, 19 Jan 2022 10:30:06 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.39.194.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2949673172; Wed, 19 Jan 2022 10:29:43 +0000 (UTC) From: Jocelyn Falempe To: dri-devel@lists.freedesktop.org Subject: [PATCH v2] mgag200 fix memmapsl configuration in GCTL6 register Date: Wed, 19 Jan 2022 11:29:05 +0100 Message-Id: <20220119102905.1194787-1-jfalempe@redhat.com> In-Reply-To: <20220114094754.522401-1-jfalempe@redhat.com> References: <20220114094754.522401-1-jfalempe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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: , Cc: Jocelyn Falempe , michel@daenzer.net, javierm@redhat.com, stable@vger.kernel.org, tzimmermann@suse.de Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On some servers with MGA G200_SE_A (rev 42), booting with Legacy BIOS, the hardware hangs when using kdump and kexec into the kdump kernel. This happens when the uncompress code tries to write "Decompressing Linux" to the VGA Console. It can be reproduced by writing to the VGA console (0xB8000) after booting to graphic mode, it generates the following error: kernel:NMI: PCI system error (SERR) for reason a0 on CPU 0. kernel:Dazed and confused, but trying to continue The root cause is the configuration of the MGA GCTL6 register According to the GCTL6 register documentation: bit 0 is gcgrmode: 0: Enables alpha mode, and the character generator addressing system is activated. 1: Enables graphics mode, and the character addressing system is not used. bit 1 is chainodd even: 0: The A0 signal of the memory address bus is used during system memory addressing. 1: Allows A0 to be replaced by either the A16 signal of the system address (ifmemmapsl is ‘00’), or by the hpgoddev (MISC<5>, odd/even page select) field, described on page 3-294). bit 3-2 are memmapsl: Memory map select bits 1 and 0. VGA. These bits select where the video memory is mapped, as shown below: 00 => A0000h - BFFFFh 01 => A0000h - AFFFFh 10 => B0000h - B7FFFh 11 => B8000h - BFFFFh bit 7-4 are reserved. Current code set it to 0x05 => memmapsl to b01 => 0xa0000 (graphic mode) But on x86, the VGA console is at 0xb8000 (text mode) In arch/x86/boot/compressed/misc.c debug strings are written to 0xb8000 As the driver doesn't use this mapping at 0xa0000, it is safe to set it to 0xb8000 instead, to avoid kernel hang on G200_SE_A rev42, with kexec/kdump. Thus changing the value 0x05 to 0x0d Signed-off-by: Jocelyn Falempe Reviewed-by: Javier Martinez Canillas Acked-by: Lyude Paul Cc: stable@vger.kernel.org --- v2: Add clear statement that it's not the right configuration, but it prevents an annoying bug with kexec/kdump. drivers/gpu/drm/mgag200/mgag200_mode.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c index b983541a4c53..cd9ba13ad5fc 100644 --- a/drivers/gpu/drm/mgag200/mgag200_mode.c +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c @@ -529,7 +529,10 @@ static void mgag200_set_format_regs(struct mga_device *mdev, WREG_GFX(3, 0x00); WREG_GFX(4, 0x00); WREG_GFX(5, 0x40); - WREG_GFX(6, 0x05); + /* GCTL6 should be 0x05, but we configure memmapsl to 0xb8000 (text mode), + * so that it doesn't hang when running kexec/kdump on G200_SE rev42. + */ + WREG_GFX(6, 0x0d); WREG_GFX(7, 0x0f); WREG_GFX(8, 0x0f);