From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423463Ab2KNVNy (ORCPT ); Wed, 14 Nov 2012 16:13:54 -0500 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:53025 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932253Ab2KNVNw (ORCPT ); Wed, 14 Nov 2012 16:13:52 -0500 Date: Wed, 14 Nov 2012 21:19:05 +0000 From: Alan Cox To: Jesse Barnes Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86/Sandy Bridge: reserve pages when integrated graphics is present Message-ID: <20121114211905.503f3701@pyramind.ukuu.org.uk> In-Reply-To: <1352925811-2598-1-git-send-email-jbarnes@virtuousgeek.org> References: <1352925811-2598-1-git-send-email-jbarnes@virtuousgeek.org> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.8; x86_64-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 14 Nov 2012 20:43:31 +0000 Jesse Barnes wrote: > SNB graphics devices have a bug that prevent them from accessing certain > memory ranges, namely anything below 1M and in the pages listed in the > table. So reserve those at boot if set detect a SNB gfx device on the > CPU to avoid GPU hangs. What happens if the other addresses map to an external memory object - eg a PCI device which is a legitimate DMA source for video overlay etc ? I assume this is just for GPU fetches from main memory ? Alan