Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261320AbVCPRnu (ORCPT ); Wed, 16 Mar 2005 12:43:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262709AbVCPRnu (ORCPT ); Wed, 16 Mar 2005 12:43:50 -0500 Received: from [81.2.110.250] ([81.2.110.250]:4020 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S261320AbVCPRnt (ORCPT ); Wed, 16 Mar 2005 12:43:49 -0500 Subject: Re: [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups From: Alan Cox To: Christoph Hellwig Cc: Keir Fraser , Linux Kernel Mailing List , akpm@osdl.org, riel@redhat.com, kurt@garloff.de, Ian.Pratt@cl.cam.ac.uk, Christian.Limpach@cl.cam.ac.uk In-Reply-To: <20050316143130.GA21959@infradead.org> References: <20050316143130.GA21959@infradead.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1110994839.1295.7.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Wed, 16 Mar 2005 17:40:43 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 477 Lines: 13 On Mer, 2005-03-16 at 14:31, Christoph Hellwig wrote: > It's bogus either way. You must never use virt_to_phys or virt_to_bus > for bus address. For systems with an IOMMU there's no 1:1 mapping. The AGPGART _is_ the IOMMU. Alan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/