From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: [PATCH] x86/Sandy Bridge: reserve pages when integrated graphics is present Date: Wed, 14 Nov 2012 21:19:05 +0000 Message-ID: <20121114211905.503f3701@pyramind.ukuu.org.uk> References: <1352925811-2598-1-git-send-email-jbarnes@virtuousgeek.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from lxorguk.ukuu.org.uk (lxorguk.ukuu.org.uk [81.2.110.251]) by gabe.freedesktop.org (Postfix) with ESMTP id AFC529E758 for ; Wed, 14 Nov 2012 13:13:50 -0800 (PST) In-Reply-To: <1352925811-2598-1-git-send-email-jbarnes@virtuousgeek.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: Jesse Barnes Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org List-Id: intel-gfx@lists.freedesktop.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