From patchwork Thu May 23 19:06:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 165059 Delivered-To: patch@linaro.org Received: by 2002:a92:9e1a:0:0:0:0:0 with SMTP id q26csp2623398ili; Thu, 23 May 2019 12:30:15 -0700 (PDT) X-Google-Smtp-Source: APXvYqxx9myG3rfjeuduQA/T1hMjbv36Yu+CxPSKUmtwS9UTnQcbKc4x1tQWCcQcqp+xb6Du+2ua X-Received: by 2002:aa7:9615:: with SMTP id q21mr13279759pfg.253.1558639815249; Thu, 23 May 2019 12:30:15 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1558639815; cv=none; d=google.com; s=arc-20160816; b=LjpVCY+wtPFYrlfLKO5wfrCuT//LZ3ewFmHfPYaF7IhrJWiXJzHArcEbS9/82IedcO e5sOw0O5uQk8IuHaM8ZOnw0EqPzJ+nmynR9uqO2qmt7vsD8xSIPxoG+z0AQrYKt9Pgw8 rP4ZXtGkTvUHQfcJW/WGovdcu6QVf//O4xDMTA62kBh2AQ3IBwMg8ecPAtmRKlfNyl3U ufAhKy1RZa4YMbiRD+DWaoLvgVH5JrD76sc4y1FxzdgS4/QpWefIMLUDetM0aQ4IF99I 1Z41lCHQqEn6CxmP+LdR0N2UPGQ8xhVJTWpW61fpeanFEJ5bKNVmXWbYPaFVIlcrzWMp D9fw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=lRqkBUqu5IDPL1mH/DqJlmad9bbm3eTPUBXnW7/rUiU=; b=t46h/7qP9k69vpILkcH6IamWxHs5Wygxlbv6vXMHea4s4YZq5aviLq9xZINwIv26VX aST7ZZX91rIq+AHl9ehl3tpEu9O2MDTQMjByvC7n7uh0YQNyYgRX9fD7UchF+KLeXMGC G3KfV9ExcbT/y4u7sAcsfwlt05awFpmNzcQy0uFVnfG4HXoFUQ2GNl/kXAyoocX8O80u aG5IxnORcFTQ7GrU44LFX9JcA3yIiolb2u7OVseDfGj9rnI6Yj6cuYVAJMHGnWUhAF5d 0eOSnkz1ZlIijvzCpjfN26ZY/aca/E96JLEmqjmkmJBmd8NWQqt4eBox4Z+3omdT9PYG 6WLQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=FIPJs5pP; spf=pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=stable-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id v21si581017pgb.560.2019.05.23.12.30.14; Thu, 23 May 2019 12:30:15 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=FIPJs5pP; spf=pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=stable-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392085AbfEWTaO (ORCPT + 14 others); Thu, 23 May 2019 15:30:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:43632 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392075AbfEWTaN (ORCPT ); Thu, 23 May 2019 15:30:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A73572133D; Thu, 23 May 2019 19:30:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639812; bh=OGUu2Sgn161BC2t3viF5PL0nsPJFqDhoMlU0WpAaogM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FIPJs5pPweJZYGilRi0McxlSJqqfTRGy0ZjKTBixtZ+FWXoDsWyitMQR0UT0FDXG6 hRI4i9rM5iwdn3MgFrRqGEVYdAxWGFCshkjsD/6LjiU1QV270/RrgNRRTs1QXXT878 S4eb+cQXrlV6BlDjanmEMU62p/ToQ3HZpTz1u4CU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Hilliard , Ard Biesheuvel , Borislav Petkov , James Morse , Linus Torvalds , Matt Fleming , Peter Jones , Peter Zijlstra , Thomas Gleixner , linux-efi@vger.kernel.org, Ingo Molnar Subject: [PATCH 5.1 085/122] fbdev/efifb: Ignore framebuffer memmap entries that lack any memory types Date: Thu, 23 May 2019 21:06:47 +0200 Message-Id: <20190523181716.171067117@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181705.091418060@linuxfoundation.org> References: <20190523181705.091418060@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ard Biesheuvel commit f8585539df0a1527c78b5d760665c89fe1c105a9 upstream. The following commit: 38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes when mapping the FB") updated the EFI framebuffer code to use memory mappings for the linear framebuffer that are permitted by the memory attributes described by the EFI memory map for the particular region, if the framebuffer happens to be covered by the EFI memory map (which is typically only the case for framebuffers in shared memory). This is required since non-x86 systems may require cacheable attributes for memory mappings that are shared with other masters (such as GPUs), and this information cannot be described by the Graphics Output Protocol (GOP) EFI protocol itself, and so we rely on the EFI memory map for this. As reported by James, this breaks some x86 systems: [ 1.173368] efifb: probing for efifb [ 1.173386] efifb: abort, cannot remap video memory 0x1d5000 @ 0xcf800000 [ 1.173395] Trying to free nonexistent resource <00000000cf800000-00000000cf9d4bff> [ 1.173413] efi-framebuffer: probe of efi-framebuffer.0 failed with error -5 The problem turns out to be that the memory map entry that describes the framebuffer has no memory attributes listed at all, and so we end up with a mem_flags value of 0x0. So work around this by ensuring that the memory map entry's attribute field has a sane value before using it to mask the set of usable attributes. Reported-by: James Hilliard Tested-by: James Hilliard Signed-off-by: Ard Biesheuvel Cc: # v4.19+ Cc: Borislav Petkov Cc: James Morse Cc: Linus Torvalds Cc: Matt Fleming Cc: Peter Jones Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-efi@vger.kernel.org Fixes: 38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes when ...") Link: http://lkml.kernel.org/r/20190516213159.3530-2-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- drivers/video/fbdev/efifb.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -476,8 +476,12 @@ static int efifb_probe(struct platform_d * If the UEFI memory map covers the efifb region, we may only * remap it using the attributes the memory map prescribes. */ - mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB; - mem_flags &= md.attribute; + md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC | + EFI_MEMORY_WT | EFI_MEMORY_WB; + if (md.attribute) { + mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB; + mem_flags &= md.attribute; + } } if (mem_flags & EFI_MEMORY_WC) info->screen_base = ioremap_wc(efifb_fix.smem_start,