Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932164AbWLNJad (ORCPT ); Thu, 14 Dec 2006 04:30:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932171AbWLNJac (ORCPT ); Thu, 14 Dec 2006 04:30:32 -0500 Received: from mtagate3.de.ibm.com ([195.212.29.152]:16290 "EHLO mtagate3.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932164AbWLNJac (ORCPT ); Thu, 14 Dec 2006 04:30:32 -0500 Date: Thu, 14 Dec 2006 11:30:28 +0200 From: Muli Ben-Yehuda To: Arjan van de Ven Cc: Linus Torvalds , Greg KH , Andrew Morton , linux-kernel@vger.kernel.org, tglx@linutronix.de Subject: Re: [GIT PATCH] more Driver core patches for 2.6.19 Message-ID: <20061214093028.GF6674@rhun.haifa.ibm.com> References: <20061213195226.GA6736@kroah.com> <20061213203113.GA9026@suse.de> <1166044547.27217.902.camel@laptopd505.fenrus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1166044547.27217.902.camel@laptopd505.fenrus.org> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 850 Lines: 20 On Wed, Dec 13, 2006 at 10:15:47PM +0100, Arjan van de Ven wrote: > with DRI you have the case where "something" needs to do security > validation of the commands that are sent to the card. (to avoid a > non-privileged user to DMA all over your memory) We also have the interesting case where your card is behind an isolation-capable IOMMU, so if you let userspace program it, you need a userspace-accessible DMA-API for IOMMU mappings (or to pre-map everything in the IOMMU, which loses on some of the benefits of isolation-capable IOMMUs (i.e., only map what you need to use right now)). Cheers, Muli - 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/