From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030240AbWDONeE (ORCPT ); Sat, 15 Apr 2006 09:34:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030246AbWDONeE (ORCPT ); Sat, 15 Apr 2006 09:34:04 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:47004 "EHLO e31.co.us.ibm.com") by vger.kernel.org with ESMTP id S1030240AbWDONeD (ORCPT ); Sat, 15 Apr 2006 09:34:03 -0400 Date: Sat, 15 Apr 2006 08:37:52 -0500 From: Jon Mason To: Benjamin Herrenschmidt Cc: Muli Ben-Yehuda , Olof Johansson , linuxppc-dev@ozlabs.org, paulus@samba.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] [2/2] POWERPC: Lower threshold for DART enablement to 1GB, V2 Message-ID: <20060415133752.GB7712@us.ibm.com> References: <20060413020559.GC24769@pb15.lixom.net> <20060413022809.GD24769@pb15.lixom.net> <20060413025233.GE24769@pb15.lixom.net> <20060413064027.GH10412@granada.merseine.nu> <1144925149.4935.14.camel@localhost.localdomain> <20060413160712.GG24769@pb15.lixom.net> <20060413173121.GJ10412@granada.merseine.nu> <1144961564.4935.24.camel@localhost.localdomain> <20060414144830.GQ10412@granada.merseine.nu> <1145048275.4223.32.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1145048275.4223.32.camel@localhost.localdomain> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 15, 2006 at 06:57:55AM +1000, Benjamin Herrenschmidt wrote: > > > What I had in mind is an interface that given a PCI bridge will tell > > you what's the most restrictive DMA mask for a device on that bridge, > > so that you'll know whether you need to enable the IOMMU for that > > bridge. I'll even settle for a function that tells you what's the most > > restrictive DMA mask in the system, period. There's nothing inherently > > arch specific about this. > > > > (and as a side note, the IOMMU we are working on on x86-64 is Calgary, > > which is actually roughly the same chipset used in some PPC > > machines...) > > Not sure I ever heard about that... What chipsets ? The pSeries POWER4 based systems (Regatta) had Calgary, and the RS/6000 POWER3 based systems (Condor) had Winnipeg (a precursor to Calgary, with many of the same features). Thanks, Jon > > Ben. > > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-dev