From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932945AbWFMHSg (ORCPT ); Tue, 13 Jun 2006 03:18:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932947AbWFMHSg (ORCPT ); Tue, 13 Jun 2006 03:18:36 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:16620 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S932945AbWFMHSf (ORCPT ); Tue, 13 Jun 2006 03:18:35 -0400 Date: Tue, 13 Jun 2006 08:18:19 +0100 From: Christoph Hellwig To: David Miller Cc: ak@suse.de, jeremy@goop.org, lkml@rtr.ca, mpm@selenic.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: Using netconsole for debugging suspend/resume Message-ID: <20060613071819.GB16358@infradead.org> Mail-Followup-To: Christoph Hellwig , David Miller , ak@suse.de, jeremy@goop.org, lkml@rtr.ca, mpm@selenic.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org References: <200606130547.49624.ak@suse.de> <20060612.214948.124554804.davem@davemloft.net> <200606130654.14477.ak@suse.de> <20060612.220346.71553967.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060612.220346.71553967.davem@davemloft.net> User-Agent: Mutt/1.4.2.1i X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 12, 2006 at 10:03:46PM -0700, David Miller wrote: > From: Andi Kleen > Date: Tue, 13 Jun 2006 06:54:14 +0200 > > > I guess if you use 1394 with remote DMA for other protocols (like > > video etc.) there must be some way for the subsystem to map > > the memory even on IOMMU systems. I admit I haven't dived that > > deeply into the 1394 subsystem so I don't know how that works. > > Video-1394 has it's own driver, which does a consistent DMA > allocation, and then maps that into userspace using remap_pfn_range(). > Entirely portable. That's actually not portable to certain arm platforms, but that's a different story.