From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D45DC282DD for ; Thu, 23 May 2019 19:16:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 74D5E21851 for ; Thu, 23 May 2019 19:16:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639011; bh=OGUu2Sgn161BC2t3viF5PL0nsPJFqDhoMlU0WpAaogM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tNIoBSI7q0Ey3VU0tHK8kEEHkfb/A5zt0s3gu935oXvDP9mOcNPSzPmTzVD49bAPE cg9uOa7WnpNwCz9CUFbN3RntJMZ00RfOcS93i/byFZv9vdFk18OC5vfVRtNs1OF2N0 J78CqAM3H28JhWr1uRAUBtaqRj1qE4lYACgXUFCw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389265AbfEWTQu (ORCPT ); Thu, 23 May 2019 15:16:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:51576 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389240AbfEWTQq (ORCPT ); Thu, 23 May 2019 15:16:46 -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 12DDE21855; Thu, 23 May 2019 19:16:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639005; bh=OGUu2Sgn161BC2t3viF5PL0nsPJFqDhoMlU0WpAaogM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bq7EZULOQPcewON2SEzDT97TWbRo0YIwtsTqoQz/xTYzChZRnGGei2Evis4wmU3Wk 5hPCNoHCi+jJXrZPIcXjuGwY+dFZ5eaEWG2QQff20jOyLiAy7/bV84/uVg2/0GRILJ okEmn9zcZ8PHLAGxIZNBJO0xAtHE+qKrhhoz1zcA= 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 4.19 061/114] fbdev/efifb: Ignore framebuffer memmap entries that lack any memory types Date: Thu, 23 May 2019 21:06:00 +0200 Message-Id: <20190523181737.128552956@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181731.372074275@linuxfoundation.org> References: <20190523181731.372074275@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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,