From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423123AbXDXVuU (ORCPT ); Tue, 24 Apr 2007 17:50:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754389AbXDXVuU (ORCPT ); Tue, 24 Apr 2007 17:50:20 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:55254 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754372AbXDXVuT (ORCPT ); Tue, 24 Apr 2007 17:50:19 -0400 Date: Tue, 24 Apr 2007 14:50:26 -0700 (PDT) Message-Id: <20070424.145026.128110905.davem@davemloft.net> To: ashok.raj@intel.com Cc: ak@suse.de, linux-kernel@vger.kernel.org, akpm@osdl.org, gregkh@suse.de, muli@il.ibm.com, asit.k.mallick@intel.com, suresh.b.siddha@intel.com, anil.s.keshavamurthy@intel.com, arjan@linux.intel.com, shaohua.li@intel.com Subject: Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range. From: David Miller In-Reply-To: <20070424213835.GB31920@linux-os.sc.intel.com> References: <200704242312.54738.ak@suse.de> <20070424.142351.62664098.davem@davemloft.net> <20070424213835.GB31920@linux-os.sc.intel.com> X-Mailer: Mew version 5.1.52 on Emacs 21.4 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Ashok Raj Date: Tue, 24 Apr 2007 14:38:35 -0700 > Its not clear if we have a very generic device breakage.. most devices > on these platforms are going to be more recent, (except maybe some > legacy fd)... I'm not so sure, there are some "modern" sound cards that have a 31-bit DMA addressing limitation because they use the 31st bit as a status bit in their DMA descriptors :-)