From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423050AbXDXTdW (ORCPT ); Tue, 24 Apr 2007 15:33:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423063AbXDXTdW (ORCPT ); Tue, 24 Apr 2007 15:33:22 -0400 Received: from mx2.suse.de ([195.135.220.15]:47952 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423050AbXDXTdV (ORCPT ); Tue, 24 Apr 2007 15:33:21 -0400 From: Andi Kleen Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg) To: Ashok Raj Subject: Re: [Intel IOMMU][patch 7/8] Support for legacy ISA devices Date: Tue, 24 Apr 2007 21:31:09 +0200 User-Agent: KMail/1.9.6 Cc: 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 References: <20070424060259.426374000@intel.com> <20070424061038.252959000@intel.com> In-Reply-To: <20070424061038.252959000@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200704242131.10139.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 24 April 2007 08:03:06 Ashok Raj wrote: > Floppy disk drivers dont work well with DMA remapping. What is the problem? You can't allocate mappings <16MB? > Its possible to > extend the current use for x86_64, but the gain is very little. If someone > feels compelled to clean this up, its up for grabs. Since these use 16M, we > just provide a unity map for the ISA bridge device. > While it's probably not worth for the floppy there are other devices with similar weird addressing limitations. Some generic handling of it would be nice. -Andi